Global LP 19710745 Series, LP 1971-745 (AUT) Series Instruction Manual & Instruction For Service Manual

Page 1

Page 2

Contents - part A - Instruction manual:

1. Proper use of the machine ................................................................................................................................................ 1

2. Description of the machine ............................................................................................................................................... 1

3. Machine sub-classes and sewing categories .................................................................................................................. 2

3.1 Sub-class ................................................................................................................................................................ 2

3.2 Sewing categories ................................................................................................................................................... 2

4. Survey of equipment ......................................................................................................................................................................... 2

4.1 Equipments ............................................................................................................................................................................... 2

4.1.1 Needles ....................................................................................................................................................................... 2

4.1.2 Wheel feeders .............................................................................................................................................................. 2

4.1.3 Top roller holders ........................................................................................................................................................ 2

4.1.4 Top rollers ................................................................................................................................................................... 2

4.1.5 Throat plate ................................................................................................................................................................. 3

4.1.6 Throat plate inserts .................................................................................................................................................... 3

4.1.7 Trimmer knife .............................................................................................................................................................. 3

4.1.8 Guide ........................................................................................................................................................................... 3

4.1.9 Connecting cables of the head to the drive ............................................................................................................ 3

4.2 Optional eqiupment ............................................................................................................................................................... 3

5. Technical data ................................................................................................................................................................................... 3

6. Operation of the machine ................................................................................................................................................. 5

6.1 Threading a thread ............................................................................................................................................... 5

6.2 Bobbin thread winding ......................................................................................................................................... 5

6.3 Inserting the bobbin and threading the lower thread ............................................................................................ 5

6.4 Regulating the thread tension .............................................................................................................................. 6

6.5 Needle replacement .............................................................................................................................................. 7

6.6 Regulation of pressing the top roller ..................................................................................................................... 7

6.7 Lifting the top roller up .......................................................................................................................................... 7

6.8 Reverse stitching .................................................................................................................................................. 8

6.9 Stitch length adjustment ....................................................................................................................................... 8

6.10 Safety clutch ............................................................................................................................................................................ 8

6.11 To exchange and set the trimmer knife ............................................................................................................................. 8

APPENDIX - applies for the double-needle post-bed sewing machine with trimmer 4281i-2 .............................................. 9

7. Electronic control of the machine ................................................................................................................................................ 11

7.1 Control of sewing by means of control elements ............................................................................................................ 11

7.1.1 Via treadle ....................................................................................................................................................................11

7.1.2 Via control pushbutton panel .................................................................................................................................. 11

7.1.3 Via control panel V810/V 820 .................................................................................................................................. 11

7.2 Adjustment of automatic functions via control panel for stop motor .........................................................................12

7.2.1 By using stop motor Efka with panel V 810 ...........................................................................................................12

7.2.1.1 Adjustment by means of buttons with fixed setting function ............................................................. 12

7.2.1.2 Setting by means of parameters .............................................................................................................. 13

7.2.2 By using stop motor Efka with panel V 820 ...........................................................................................................14

7.2.2.1 Adjustment by means of buttons with fixed setting function ............................................................. 15

7.2.2.2 Setting by means of parameters .............................................................................................................. 15

8. Maintenance .......................................................................................................................................................................................16

Operating instructions for eventual trouble shooting ................................................................................................................ 17

Page 3

Foreword

This instruction manual is intended to help the user to become familiar with the machine and take advantage of its application possibilities in accordance with the recommendations.

The instruction manual contains important information on how to operate the machine securely, properly and economically. Observation of the instructions eliminates danger, reduces costs for repair and down-times, and increases the reliability and life of the machine.

The instruction manual is intended to complement existing national accident prevention and environment protection regulations.

The instruction manual must always be available at the machine/sewing unit.

The instruction manual must be read and applied by any person that is authorized to work on the machine/sewing unit. This means:

- Operation, including equipping, troubleshooting during the work cycle, removing of fabric waste

- Service (maintenance, inspection, repair and/or)

- Transport.

The user also has to assure that only authorized personnel work on the machine.

The user is obliged to check the machine at least once per shift for apparent damages and to immediatly report any changes (including the performance in service), which impair the safety.

The user company must ensure that the machine is only operated in perfect working order.

Never remove or disable any safety devices.

If safety devices need to be removed for equipping, repairing or maintaining, the safety devices must be remounted directly after completion of the maintenance and repair work.

Unauthorized modification of the machine rules out liability of the manufacturer for damage resulting from this.

Observe all safety and danger recommendations on the machine/unit! The yellow-and-black striped surfaces designate permanend danger areas, eg danger of squashing, cutting, shearing or collision.

Besides the recommendations in this instruction manual also observe the general safety and accident prevention regulations!

Page 4

General safety instructions

The non-observance of the following safety instructions can cause bodily injuries or damages to the machine.

1. The machine must only be commissioned of the instruction book and operated by persons with appropriate training.

2. Before putting into service also read the safety rules and instructions of the motor supplier.

3. The machine must be used only for the purpose intended. Use of the machine without the safety devices is not permitted. Observe all the relevant safety regulations.

4. When gauge parts are exchanged (e.g. needle, presser foot, needle plate, feed dog and bobbin) when tread-ing, when the workplace is left, and during service work, the machine must be disconnected from the mains by switching off the master switch or disconnecting the mains plug.

5. Daily servicing work must be carried out only by appropriately trained persons.

6. Repairs, conversion and special maintenance work must only be carried out by technicians or persons with appropriate training.

7. For service or repair work on pneumatic systems the machine must be disconnected from the compressed air supply system. Exceptions to this are only adjustments and functions checks made by appropriately trained technicians.

8. Work on the electrical equipment must be carried out only by electricians or appropriately trained persons.

9. Work on parts and systems under electric current is not permitted, except as specified in regulations DIN VDE 0105.

10. Conversion or changes to the machine must be authorized by us and made only in adherence to all safety regulations.

11. For repairs, only replacement parts approved by us must be used.

12. Commissioning of the sewing head is prohibited until such time as the entire sewing unit is found to comply with EC directives.

It is absolutely necessary to respect the safety instructions marked by these signs.

Danger of bodily injuries !

Please note also the general safety instructions.

IMPORTANT WARNING!

To the feeding network cord, it is necessary to connect the respective network plug which has been approved in the country of utilizing the machine. This operation should be performed by a worker acquainted with the electric safety rules being in force in the given country. The supplier is not responsible for any damages caused by defective plug or owing to incorrect assembly of the plug.

In spite of all safety measures made on the machines, inappropriate actions of the operator may lead to dangerous situations. In industrial sewing machines, attention should be paid to the following still remaining possible sources of injury:

1. Moving sewing needle

- risk of injury when sewing with raised pressure foot or top roller, because the finger guard is then positioned too high.

2. Moving thread take-up lever

- risk of injury when inadvertently or intentionally inserting the finger(s) between the thread take-up lever and its guard.

3. Moving pressure member

- risk of injury when holding sewn work in immediate vicinity of the pressure member and beginning to insert under the pressure

member a considerably thicker sewn work portion,

- risk of injury when sinking the pressure member.

4. Moving trimming knife

- risk of injury when sewing and trimming with lifted presser element (roller, foot), because the finger guard is high

- risk of injury when inadvertently threading down of the motor threadle.

5. When switched off, the clutch motor slows down by inertia but would be reactivated by an accidental tread-ing down of the motor treadle. To avoid such risk, it is advised to hold the handwheel by hand and slightly to depress the motor treadle.

Page 5

Part A - Instruction manual

1. Proper use of the machine

The machine can be used in the shoe uppers production for sewing with simultaneous trimming of the lining edge. The machine is also used for setting together shoe parts and for decorative stitching. The combined feed provides for uniform slip-free feed of all sewn work layers. The machine also can be used for similar operations in the fancy goods industry. It is used for upper leather and similar materials, natural or man-made leather, also in combination with textile materials The trimming system used is intended for a relatively stiff material, not for a soft or textile one The knife is driven by an auxiliary motor and ensures top-grade trimming of the lining material, in particular in inner and outer arches and in sharp angles. The machine sews with two-thread lockstitch. It is standardly equipped with needles of the 134 KKLR system which are suitable for sewing leather. When sewing textile materials it is necessary to install needles of the 134 system. Only a dry material up to 6 mm thick when depressed by top roller can be used. The material cannot contain any hard subjects, otherwise the use of an eyeprotective shield is imperative. Such a shield is not yet available to delivery. Synthetic, cotton, or core threads up to labelled number 20 should be used. The use of other special threads is at the risk of the user who should take appropriate safety measures, as the case may be. For joining very hard or compact materials, the sewing speed must be reduced substantially below the value given in Table 1. These special machines may be installed and operated only in dry and kept up rooms. We as industrial sewing machine producers expect that our products are operated by trained workers so that all usual operation steps and their possible risks can be considered known to them.

Machine noise level

The machine noise level has been measured in accordance with the standards ISO 3746, ISO 11204 at the top sewing speed. Laeq = equivalent noise level of the machine proper on its working place, converted to the % of machine operating time (dB) see the Table.

2. Machine description

It is a single-needle post bed sewing machine with two-step upper feed and lower wheel feed, with needle feed during the first feeding step. The principal mechanisms are seated in antifriction bearings, rocking shafts and pins, in plain bearings. The feed is transmitted from the stitch length regulation mechanism via friction clutch to the lower feed shaft, and from it by a roller chain to the feed wheel. The drive of the roller presser foot is derived from the bottom feeding shaft through an indented belt on the top feeding shaft through abevel gearing on an articulated vertical shaft. The needle feed is derived from the same mechanism as the top roller/feed wheel feed.The stitch length can be adjusted by a dial situated on the machine arm.

Caution!

Sewing speed prescribed as top limit speed for a given operation must not be exceeded under the risk of damage to the feeding mechanism.

The reverse stitching is controlled by a hand lever or by a microswitch. A sewing set with interchangeable throat plate inlays corresponding to the chosen needle size and distance between the needle axis and the work trimmer is mounted on the machine. Top rollers with ø 25, ø 35 or ø 45 mm are available.The vertical hook is fitted with positive bobbin case opening and is secured by overload release clutch with adjustable release moment. The machine uses a wick lubrication system with central oil supply. The machine is fitted with standard vertical hook situated to the right of the needle, with friction-type bobbin winder. The machine can be fitted with thread trimmer, electromagnetically actuated top roller lifting and reverse stitching, accessory lighting with halogen lamp and, as the case may be, with further equipment. In machines without electromagnetically actuated top roller lifting, the lifting is actuated by a knee lever or, for deliveries to Czech customers, by left-side treadle. The machine stand is fitted with a wedge and, depending on the top roller lifting version, with one or two treadles. The lower horizontal work trimmer, spring-biassed both upwards, serves to trim he lining edge in inner and outer arches as well as in acute angles. The trimmer knife is driven by a lever system from a separate motor situated under the bed plate. When switched out by a press-button, it automatically takes up its inoperative position, and automatically switches on again when returned by the lower lever to its operative position. The trimming motion length is adjustable. Various trimmer knives and a tilting sewn work guide can be ordered with the machine.

Notice: In the manufacturing factory, an extension (mounting) on the double-needle post-bed sewing machine with horizontal work trimmer (4281i-2) as an accessory according to the given specification can be ordered - see pages 9,10.

Type of the Noisiness % machine

machine dB employment

4181i-1XX-100 82 20

4181i-1XX-200 79 20

4181i-1XX-300 73 20

Page 6

3. Machine sub-classes and sewing categories

3.1 Sub-class

Table 1

*for only Czech republic

3.2 Sewing categories

This code indication includes the equipment assembled on the machine head, both necessary equipment and optional equipment. The standard configuration of the equipment has been preset, according to the under mentioned table, in the factory which includes only necessary equipment. If the buyer demands a different configuration then the factory allocates a new code indication. Table 2 Standard configuration - the numbers in brackets stand for ordering Nos. when ordering separately the Equipment in question (needles - delivered in 10 pcs pack).

Type Needle size Top roller Wheel feeder Throat plate insert Throat plate

Width of hole/distance

between the needle axis

Class-sub-class Diameter Pitch of teeth and the work trimmer line

-sewing category 0.01mm mm mm mm -

4181i-1XX-100

80 35 0.4 1.2/0.8

(S548 134013) (M 173) (M 060) (M 144)

4181i-1XX-200

100 35 0.4 1.5/1.2 (M 143)

(S548 134001) (M 173) (M 060) (M 145)

4181i-1XX-300

130 35 0.6 2.0/1.5

(S548 000311) (M 173) (M 059) (M 146)

4. Survey of equipment

This survey does not include the equipment assembled on the stand.

4.1 Equipments (at least one of each from the following group of equipment is assembled)

4.1.1 Needles

M 020 - needle 134 LR size 80 M 023 - needle 134 LR size 100 M 021 - needle 134 LR size 130

4.1.2 Wheel feeders

M 060 - wheel feeder with pitch of teeth 0.4 mm M 059 - wheel feeder with pitch of teeth 0.6 mm M 058 - wheel feeder with pitch of teeth 1.2 mm

4.1.3 Top roller holders

M 156 - holder for the top roller ø 25 mm M 157 - holder for the top roller ø 35 mm M 295 - holder for the top roller ø 45 mm

4.1.4 Top rollers

M 172 - top roller ø 25 mm M 173 - top roller

ø 35 mm

M 174 - rubberized top roller ø 25 mm M 175 - rubberized top roller ø 35 mm M 310 - smooth top roller

ø 25 mm

M 311 - smooth top roller

ø 35 mm

M 296 - top roller

ø 45 mm - width 3.8 mm

M 297 - top roller

ø 45 mm - width 2.0 mm

Type of Top roller lift Reverse stitching Thread

the machine trimmer

Class-subclass Via knee Treadle Via electro- Via electro- Via hand Via electro-

-sewing lever mag. + mag. + lever mag. +

category knee lever treadle hand lever

4181i-111-XXX 4181i-121-XXX* 4181i-147-XXX 4181i-157-XXX*

•

Page 7

4.1.5 Throat plate

M 143 - throat plate

4.1.6 Throat plate inserts

M 144 - insert for throat plate (for needle 60-80; trimmed edge 0.8) M 145 - insert for throat plate (for needle 80-110; trimmed edge 1.2) M 146 - insert for throat plate (for needle 110-140; trimmed edge 1.5)

4.1.7 Trimmer knife

M 171 - trimmer knife 11165 x 2.7

4.1.8 Guide

M 018 - sewn work guide

4.1.9 Connecting cables of the head to the drive

M 163 - connecting cable to the drive EFKA DC 1600/DA82GA; EFKA VD 552/6F82FA and EFKA VD 554/6F82FA M 055 - connecting cable without any specified drive (with free cable end) Note: For the machine provided with a minimotor, the cable is component part of the drive thereof.

4.2 Optional equipment

M 010 - built-in lighting (including transformer 230/12V) M 242 - setting gauge 4181 111001V - high mortality spare parts kit in plastic box for sub-class without thread trimmer 4181 147001V - high mortality spare parts kit in plastic box for sub-class with thread trimmer S794 222012 - halogen lighting (12 V, 20 W - contains transformer)

5. Technical data

Table 3

Sewing Sewn material Distance be- Stitch length Labelled Number Sewing Hook

category tween the number of of needle speed

needle axis polyester and the work thread trimmer line

Standard

m m - mm m m mm - - 0,01mm 0,01mm SPM SPM

-100

-lihgt

0.8 2 0.8 2 3 70 80-60 80 60-80 2500 3500 R 816

-200

-medium

1 2 1.2 2.5 5 40 50-30 100 80-110 2500 3000 R 816

-300 - me-

dium heavy

1.5 2 1.5 3 5 20 30-20 130 110-140 2000 2000 R 816

Thickness of one

layer

Number of layers

Standard

Maximum

Standard

Range

Standard

Range

Standard

Maximum

Stitch type Double thread lock-stitch Stitch length max. 5 mm ± 10% Top roller stroke 5.5 ± 0.5 mm - via hand lever

12.5 ± 1 mm via knee lever, treadle, electromagnet

Hook R 816 - vertical small Needle System 134 LR; 134 KKLR; 134 Trimmer knife 11165 x 2.7 (in table No. 4 indicated *) Driving unit Lever clutch 4 poles change motor min. 0.4 kW, lewer clutch

2 poles change motor min. 0.4 kW

Stopmotor min. 0.4 kW Weight of the head max. 52 kg (58 kg head with minimotor) Weitght of the stand max. 60 kg (38 kg for head with minimotor) Height of post bed 173 mm Opening space of machine head 270 x 298 mm Dimension of bed plate 178 x 518 mm Sewn material fine leather, boxcalf, goat leather, box patent leather, split

leather, lining, leathers, artificial leather, etc.,

medium-weight leathers, textile materials, also in combi-

nation with artrificial leathers

Page 8

Trimmed material lining of relatively stiff materials - max. 2.5 mm Distance between the needle axis and the work trimmer line 0.8 - 1.5 mm (according to sewing category) Power output of the work trimmer motor 25 W Stroke frequency of the work trimmer knife 3300 strokes/min (constant) Stroke range of the work trimmer knife 1,2 - 4,3 mm (adjustable) Length of trimmed thread ends 8 - 11 mm Input machine with clutch motor Max. 700 W Input machine with stop motor Max. 800 W (600 W with minimotor) Equivalent accoustic presser level of the sole machine at work place by 20% use of the machine during a shift under standard sewing conditions 82 dB/A Layout dimensions of the machine (including the stand) 1060 x 550 mm Height of the machine (including the stand) 1680 mm

Applicable knives

Table 4 The upper No. in the column - Ordering No. - applies to orders placed ith the company Maier, the lower one for those placed with Minerva.

* supplied as standard can be ordered with Minerva as well to be ordered with the company Maier

Grinding the work trimmer knife

To obtain due quality of trimming, the knife should be ground on special grinding machines at short intervals (of about 2 to 5 hours) corresponding to the durability of the knife trimmer edge. The special grinding machines are produced by the following companies: FORTUNA WIEN GmBH, A-1151 WIEN-Pelzgasse 13, Postfach 91 MAIER UNITAS GmBH, NÜRTINGER Strasse 19, D-7316, KÖNGEN, Postfach 1130

Tooling steel, For normal lining

flat version, material with

long cutting edge, cross-sections

front end turned up

High-speed steel, For very soft or

flat version, synthetic linings

long cutting edge, material with

front end turned up cross-sections

Tooling steel, For normal lining

elbowed version with material with

short cutting edge, cross-sections

front end turned up and tight curves

High-speed steel, For very soft or

elbowed version with synthetic lining material

short cutting edge, with cross-sections

front end turned up and tight curves

Tooling steel, For normal lining

flat version with material

cutout for sewing

corners,

long cutting edge

Tooling steel, For normal lining

low-elbowed with material with

long cutting edge, cross-sections

front end turned up

Tooling steel, For trimming outer

elbowed, edges of thick material

upward-cutting

11165 x 2,7 *

13 2,7

S425 311020

11165 x 3,0

13 3,0

11165 x 3,5

13 3,5

S425 311026

11165 x 2,7 HSS

13 2,7

11165 x 3,5 HSS

13 3,5

11165 x 4,0 HSS

13 4,0

11233 x 2,7

11 2,7

S425 311030

11233 x 2,7 HSS

11 2,7

11166 x 2,7

13 3,5

S425 311032

11166 x 3,1

13 2,7

11166 x 3,5

13 3,5

S425 311034

11166 x 4,0

13 4,0

11233 x 2,7 BX lang

= 11178 x 2,7 14 2,7

S425 311036

040188 x 7,0

S425 311037

14,5 7,0

Ordering No. Side of Height of Illustrations Features Applications

trimmer trimmer (a)

(mm) (mm)

Page 9

6. Operation of the machine

6.1 Threading a thread

Caution! Risk of injury!

Before threading a thread, turn the main switch off and wait until the machine stops!

Thread the threads as it is shown in picture.

Caution!

Not following the correct method of threading a thread may cause serious damage to the function of the machine.

6.2 Bobbin thread winding

- Insert the bobbin (1).

- Spool counter-clockwise manually onto the bobbin, minimum six threads of the lower thread (3).

- Insert the thread ends into the equipment (4) and cut off the ends.

- Press the lever (2) until it reaches its limit.

- Switch on the machine.

- The winder will automatically switch off after winding.

- Take off the hook bobbin and cut off the end in the equipment (4).

- The nut (5) is instrumental to thread tension control for winding. Turning clockwise sense the thread tension is increased and the single threads are more firmly fixed on the bobbin.

- The tension cannot be so extensive as far as slipping of the winder friction drive has occured.

6.3 Inserting the bobbin and threading the lower

thread

Caution! Risk of injury!

Turn the main switch off and wait until the motor stops!

- Tilt the shutter (1) up.

- Insert the bobbin (2) with thread end (3) in the direction as shown in the picture.

- Pass the thread through the notch (4) and then through the gap between the part (5) and the hook (6) into the notch (7), as shown in illustration.

- Close the hook cover (8) and cut with scissors the thread end close at the cover.

2 7

5 4

Page 10

6.4 Regulating the thread tension

The thread tension must conform to the thickness of the sewn threads, thickness and hardness of sewn material (thin and soft material will fold with high tension) and the kind of seam. An ordinary fitting seam should be formed with stitches knitted in the middle of the sewn material.

A decorative seam is mostly used with rough threads (20) on thin material and it has tied up threads on the reverse side of the material for achieving a decorative appearance. Thread tension adjustment is by standard sewing (par. 5, table 3) conditions in accordance with table No. 4. If achieving of a decorative seam with stitch knitting on the underside is wished, it is necessary to decrease the upper thread tension, it is carried out by turning of nuts (1), in the counter-clockwise sense.

Thread tension

Table 4

Sewing Kind of seam Identified Maximum

category value upper tension of

thread tension lower thread

NN 1- 31 2 - 4.5 1.5

Fitting 8

Decorative 5

If the maximum lower thread tension exceeds the values given in table No. 4, it may cause problems in the beginning of sewing after the previous thread trim.

Measurement of tension is done by dynamometer.

Warning:

The upper thread tensioner has been loosened automatically after every trimming and top roller lifting. In these cases the thread tension cannot be measured.

Regulating the thread tension

Caution! Risk of injury!

Before regulating the lower thread tension, turn the main switch off and wait until the motor stops.

The upper thread tension is adjusted with nuts (1). Its clockwise turning increases the tension. The tension of the auxiliary tensioner (3) should be as low as possible but it should be on a level so that the upper thread would not pull out of the tensioner when the work is being removed. The lower thread tension is adjusted with a screw (2). Its clockwise turning increases the tension. Tension correlation rate defines the depth of the seam tied through. The result of raising the upper tension will be the decreasing depth of tie through. The opposite will apply with the lower thread.

Fitting seam

Decorative seam

Stitch knitting

Page 11

6.5 Needle replacement

Caution! Risk of injury!

Before remowing and inserting the needle turn the main switch off and wait until the motor stops!

- Turn with the hand wheel as far as the top needle (1) position has been reached.

- Loosen the screw (2) and take the needle out.

- When inserting a new needle, care is to be taken that groove (3) above the needle’s eye was in the same direction as the hook.

- Tighten the screw (2).

The inserted needle must respond to the sewing category according to paragraph No. 5, table 3. Otherwise it will cause damage to sewing, or eventually the machine could be broken.

6.6 Regulation of pressing the top roller

The pressing of the top roller should be as low as possible but on a level so that the top roller would not fly over when needle comes off the material and that the feeding power got over the thread pull by stitch tightening. By turning of the screw (1) clockwise pressing of the top roller has been increased, by counter-clockwise turning pressing of the top roller has been decreased.

6.7 Lifting the top roller up

Mechanical lifting of the top roller is enabled by means of the hand lever (1), which contemporarily, after it has been lifted in the arrow direction, is locking the top roller in its top position and turning (adjustment) of the machine is possible. The top roller can be lifted via knee lever or left treadle - depending on the machine sub-class. Automatical lifting by means of electromagnet is described in the paragraph No. 7.

When lifting top roller via knee lever or the treadle or electromagnet, the needle must be in the upper position and the machine has to come to a full stop.

Page 12

6.8 Reverse stitching

The change of direction of sewn work can be mechanically controlled via a reverse stitching lever (1) by its depression in the arrow direction (down). The sub-class defines whether the machine has electromagnetic reverse stitching – see paragraph No. 7.

6.9 Stitch length adjustment

Stitch length adjustment is by dial (2) by its turning. Turning clockwise stitch length is decreased, turning counter-clockwise stitch is length increased.

6.10 Safety clutch

The machine is provided with a safety clutch which disengages the driving unit, when the hook is blocked. Reconnection must be done in the following way:

Caution! Risk of injury!

Before assembly turn the main switch off and wait until the motor stops!

- Turn the manually operated wheel as far as you can reach the suitable point for inserting a screwdriver into the space(1).

- Continue turning the manually operated wheel in direction of the arrow located on it, until you feel the drop in of the safety clutch.

6.11 To exchange and set the trimmer knife

Caution! Risk of injury!

Before assembly turn the main switch off and wait until the motor stops!

- Loosen the nut (1).

- Move the trimmer knife (2) in the direction of the arrow out.

- Set an angle of 180° on the handwheel (the needle is at its bottom dead point).

- Insert a new trimmer knife (2) and set its trimmer surface in relation to the edge of the inlay of the throat plate (A) just permitting the trimmer knife movement.

- Tilt the machine head and rotate by hand the drive shaft of the work trimmer so as to set the trimmer knife to its rear end position. Set the needle to its lower dead point, i.e., to the angle of 180° of the handwheel. Loosen screws (3, 4) and adjust the angular position of the whole knife holder so as to obtain the distance between trimmer edge and needle axis „B“ = 1...1.5 mm.

- Retighten the screws (3, 4) as well as the nut (1).

The height of the trimmer knife (trimmer edge) is standard set to trim a 0.8 - 1 mm thick material. The height can be adjusted in relation to the edge of the throat plate inlay if another trimmer knife (with a different trimmer height) is to be used:

- To do so, loosen the screw (5) and set the correct height with the eccentric (6), or also correct the distance between the trimmer edges A; B as described above. Retighten the screw (5).

3 4

Page 13

APPENDIX -

applies for the double-needle post-bed sewing machine with trimmer 4281i-2

(the following chapters substitute the chapters on pages 2 -7, the other ones are the same)

4.1 Equipments (at least one of each from the following group of equipment is assembled)

4.1.1 Needles

M 132 - needle 134 KKLR size 80 Schmetz M 133 - needle 134 KKLR size 90 Schmetz

4.1.5 Throat plates

M 207 - throat plate for needle distance of 1.2 mm - work trimmer M 208 - throat plate for needle distance of 1.6 mm - work trimmer

4.1.6 Throat plate inserts

M 217 - insert for throat plate (for needle 60-80; needle distance of 1.2 mm; trimmed edge 0.8 mm) M 210 - insert for throat plate (for needle 80-110; needle distance of 1.6 mm; trimmed edge 1.2 mm) M 209 - insert for throat plate (for needle 60-80; needle distance of 1.6 mm; trimmed edge 0.8 mm)

5. Technical data

Table 3

Sewing Needle Distance Stitch length Labelled Number Sewing speed Hook

category distance between the number of of needle

needle axis polyester

and the work thread

trimmer line

m m mm mm mm - - 0,01mm 0,01mm SPM SPM

-100

-light

1,2 0,8 2 3 70 80-60 80 60-80 2500 3000 R 816

-200

-medium

1,6 1,2 2,5 5 40 50-30 90 80-110 2000 2500 R 816

Standard

Maximum

Standard

Range

Standard

Range

Standard

Maximum

Page 14

6. Operation of the machine

6.1 Threading a thread

Caution! Risk of injury!

Before threading a thread, turn the main switch off and wait until the machine stops!

Thread the threads as it is shown in picture.

Caution!

Not following the correct method of threading a thread may cause serious damage to the function of the machine.

6.5 Needle replacement

Caution! Risk of injury!

Before remowing and inserting the needle turn the main switch off and wait until the motor stops!

- Turn with the hand wheel as far as the top needle (1) position has been reached.

- Loosen the screw (2), (3) and remove the required needle.

- When inserting a new needle, care is to be taken that groove (4) above the needle’s eye was in the same direction as the hook.

- Tighten the screw (2), (3).

The inserted needle must respond to the sewing category according to paragraph No. 5, table 3. Otherwise it will cause damage to sewing, or eventually the machine could be broken.

Page 15

7. Electronic control of the machine

(it is valid for sub-classes equipped with stop motor)

7.1 Control of sewing by means of control elements

7.1.1 Via treadle (treadle positions and function possibilities)

The position of the treadle is read by the reader, which can recognise 16 levels. Its meaning is shown on the table.

Treadle Treadle Meaning

position

-2

Foot full backwards Command for thread

trimming (seam finishing)

-1

Foot slightly Commandlifting

the top roller up

0 Neutral position Note 1

Slightly forwards Command releasing

top roller

Continually Sewing at minimum

forwards speed (1. gear)

Continually Sewing at second

forwards speed level

: : :

Fully forwards Sewing at maximum

speed (12. gear)

Note: It is possible to pre-adjust the needle position (up/down) and foot position (up/down) by stopping in seam (introducing the treadle in neutral position). Foot position (up/down) after seam finishing (pressing the treadle by foot fully backwards).

7.1.2 Via pushbutton panel

There are four built-in pushbuttons in the panel with fixed adjustable functions: T1 - bar operation (by pressing this pushbutton during

sewing the sewn work is feed back)

T2 - needle up/down (each press of the pushbutton changes

the needle position)

T3 - temporary cancelling (recalling) bar (in case) the bar is

pre programmed at the start and end of the seam, by pressing the pushbutton down will uniformly switch off; if it is not chosen it will switch on by pressing the pushbutton

T4 - revolutions limitation (valid for motor Efka DA82GA)

- reduction of pressure of the presser foot for Mini-stop EFKA DA320 (see The instructions for assembling with Mini-stop, par. 5.2.4)

7.1.3 Via control panel Efka V 810/V 820

These functions are standardly assigned to the pushbuttons A, B:

A - cancelling (recalling) the bar (the same function as T3 of

the pushbutton panel)

B - needle up/down(the same function as T2 of the push-

button panel)

Note: function of the A,B pushbuttons can be changed by different adjustment of parameters 293,294 (see the parameters list of driving unit Efka DA82GA).

T 1 T 2 T 3 T 4

1 ÷ 13

-1

-2

Page 16

7.2 Adjustment of automatic functions via control panel for stop motor

7.2.1 By using stop motor Efka with panel V 810

Functioning pushbuttons engagement: Pushbutton P Recalling and program mode termination Pushbutton E Confirmation of program mode changes Pushbutton + Increase of value displayed in program

mode

Pushbutton - Decreasing value displayed in program

mode Pushbutton 1 Start bar SINGLE/DOUBLE/OFF Pushbutton 2 End bar SINGLE/DOUBLE/OFF Pushbutton 3 Automatic top roller lifting after stopping

at the seam ON/OFF

Automatic top roller lifting after thread

trimming (end of seam) ON/OFF

Automatic presser foot lifting after

thread trimming (end of seam) ON/OFF

Automatic reduction of pressure of the

presser foot ON/OFF (only for DC 1550/

DA320; see The instructions for assem-

bling with Mini-stop, par. 5.2.4) Pushbutton 4 Basic position of needle UP/DOWN Pushbutton A For cancelling respectively recalling

the bar Pushbutton B For switch over the needle position

UP/DOWN respective shift pushbutton

in program mode Symbol C Connection of automatic revolutions Symbol D Connection of lighting barrier Symbol E The machine is running Symbol F The revolutions limitation switch on Symbol G Connection of lower thread controller,

flashing light indicator symbol when

the threads supply on the bobbin is

running out

The arrows on the display indicate switching the functions which are displayed by symbols above the pushbuttons on.

7.2.1.1 Adjustment by means of buttons with fixed setting

function

Note: It is important to finish the seam in order to reach effective button pressing (press the treadle fully backwards down). Setting start bar: Drive enables sewing start bar automatically. It is necessary to choose the type (single, double, off) and number of stitches which will be sewn forwards and backwards. The arrow above its symbol shows the type of bar (chosen by gradually pressing pushbutton 1). It will be displayed following after pressing pushbutton 1. Arv (SAv) XXX - number of stitches of start (fancy) bar forwards or Arr (SAr) XXX - number of stitches of start (fancy) bar backwards) for about 3 sec. At this time you can change the number of stitches by gradually pressing the pushbutton + or -. By setting the treadle to its zero position during the sewing of the start bar (par. 215 - OFF), you stop the machine at the completion of the start bar. You can then switch on the sewn work cutter. Setting end bar: The same applies to the start bar (setting by the means of pushbutton 2).

Page 17

Erv (SEv) XXX - end (fancy) bar number of stitches forwards Err (SEr) XXX - end (fancy) bar number of stitches backwards Note: The last section of end bar must have at least 3 stitches. Foot position adjustment by stopping at the seam (by neutral position of treadle) and after finishing seam (by neutral position of treadle): Setting is by means of pushbutton 3, arrow indication above the corresponding symbol.

Needle position adjustment by stopping at the seam: Setting is by means of pushbutton 4.

7.2.1.2 Setting by means of parameters

Drive memory contains the parameters which enables sewing system tuning. These parameters have exact meaning and they are divided into 3 levels. Further parameters which are available only for operation will be quoted. Each parameter has its (sequence) number and value.

General procedure by changing parameters of operation level:

- switch the main switch on or finish the seam by pressing the treadle fully backwards down

- press pushbutton P on the panel V 810

- it will be displayed on the display F 000 (000 it is the number of parameter)

- by several times pressing + (or -) set the requested number of parameter

- push pushbutton E down and it will be shown the value of parameter on the display

- you can change the value by means of pushbutton + or –

- by pushing pushbutton E down you will change the sequence to the following number of parameter

- by pushing pushbutton P down you will leave the mode of changing parameters

Note: 1. For permanent memory storing of changed pa-

rameter, it is necessary to press treadle forwards down after changing of parameters.

2. Mode of changing parameters is possible only after finishing of the seam.

Number of stitches in bars: Number of stitches is stored in parameter’s number.

No. of parameter Value range Description

of parameter of parameters

000(080) 0-254

Number of stitches of

start (fancy) bar forwards

001(081) 0-254

Number of stitches of

start (fancy)bar backwards

002(082) 0-254

Number of stitches of

end (fancy) bar backwards

003(083) 0-254

Number of stitches of

end (fancy)bar forwards

Sewing according to sewing program: Drive with panel V810 automatically enables sewing of 1 seam with setting number of stitches. It is necessary to set in corresponding number of stitches, and initialisation of sewing program.

No. of parameter Value range Description

of parameter of parameters 007 0-254 Number of stitches 015 ON/OFF

ON/OFF sewing under

sewing program

Page 18

ON/OFF thread trimmer:

No. of parameter Value range Description

of parameter of parameters

013 ON/OFF

Thread trimmer

ON/OFF

7.2.2 By using stopmotor Efka with panel V 820

Functioning pushbuttons engagement: Pushbutton P Call and termination of programming mode Pushbutton E Confirmation when changing programming

mode

Pushbutton + Increasing the value displayed in program-

mingmode

Pushbutton - Reducing the value displayed in program-

ming mode Pushbutton 1 Start bar SINGLE/DOUBLE/OFF Pushbutton 2 Stitch counting FORWARD/BACK/OFF Pushbutton 3 Light barrier function

LIGHT-DARK/DARK-LIGHT/OFF Pushbutton 4 End bar

SINGLE/DOUBLE/OFF Pushbutton 5 Function

TRIMMING/TRIMMING+EJECTOR/OFF Pushbutton 6 Automatic top roller lifting after having

stopped inside the seam ON/OFF

Automatic top roller lifting after trimming

ON/OFF

Automatic presser foot lifting after thread

trimming (end of seam) ON/OFF

Automatic reduction of pressure of the

presser foot ON/OFF (only for DC 1550/

DA320; see The instructions for assembling

with Mini-stop, par. 5.2.4) Pushbutton 7 Basic needle position UP/DOWN Pushbutton 8 Lower thread waste controlling ON/OFF Pushbutton 9 Operation pushbutton - programmable Pushbutton 0 Programming/processing of 40 possible

sewing sections (seams) Pushbutton A For cancelling or calling the bar Pushbutton B For switching needle position UP/DOWN,

resp. shifting pushbutton in the program-

ming mode Symbol C Designating symbol C for code number Symbol D Designating symbol F for parameter

number Symbol E Programme number in TEACH IN mode Symbol F Seam number in TEACH IN mode Symbol G Run blocking ON Symbol H Blocked insertion by pushbutton Symbol I Fault reporting Symbol J Insertion of stitch number in TEACH IN

mode Symbol K Connected lower thread controller, flashing

symbol when running out thread reserve

on bobbin Symbol L Limitation of revolutions ON Symbol M Right needle disconnected symbol N Evening stitches for light barriee in the

TEACH IN mode Symbol O Machine is running

CD E F GH I JKLMNOPQ

Page 19

Symbol P Automatic revolutions ON Symbol Q Left needle disconnected

The arrows on the display indicate switching the functions which are displayed by symbols above the pushbuttons on.

7.2.2.1 Adjustment by means of buttons with fixed setting function

Note: It is important to finish the seam in order to reach effective button pressing (press the treadle fully backwards down). Setting start bar: Drive enables sewing start bar automatically. It is necessary to choose the type (single, double, off) and number of stitches which will be sewn forwards and backwards. The arrow above its symbol shows the type of bar (chosen by gradually pressing pushbutton 1). It will be displayed following after pressing pushbutton 1. Arv (SAv) XXX - number of stitches of start (fancy) bar forwards or Arr (SAr) XXX - number of stitches of start (fancy) bar backwards for about 3 sec. At this time you can change the number of stitches by gradually pressing the pushbutton + or -. By setting the treadle to its zero position during the sewing of the start bar (par. 215 - OFF), you stop the machine at the completion of the start bar. You can then switch on the sewn work cutter. Setting end bar: The same applies to the start bar (setting by the means of pushbutton 4). Erv (SEv) XXX - end (fancy) bar number of stitches forwards Err (SEr) XXX - end (fancy) bar number of stitches backwards

Note: The last section of end bar must have at least 3 stitches. Foot position adjustment by stopping at the seam (by neutral

position of treadle) and after finishing seam (by neutral position of treadle): Setting is by means of pushbutton 6, arrow indication above the corresponding symbol.

Needle position adjustment by stopping at the seam: Setting is by means of pushbutton 7. Trimming switched ON/OFF: To be set using pushbutton 5. Sewing programme ON: To be switched on using pushbutton 0. Switching ON/OFF the function of the pushbutton F: The pushbutton F on panel can have assigned one of the following functions: Sst - softstart

SrS - fancy bar Frd - reverse angle after trimming

7.2.2.2 Setting by means of parameters

- switch the main switch on or finish the seam by pressing the

treadle fully backwards down

- press pushbutton P on the panel V 820

- on the display there is no data shown

- by depressing the pushbutton E several times, set the

required parameter (without having displayed the parameter number)

- you can change the value using pushbuttons + or -

CD E F GHI JKLMNOPQ

Page 20

CD E F GHI JKLMNOPQ

- by depressing the pushbutton E you will pass in the given sequence to the following parameter

- by depressing the pushbutton P down you will leave the mode of changing parameters

Note: 1. For permanent memory storing of changed pa-

rameter, it is necessary to press treadle forwards down after changing of parameters.

2. Mode of changing parameters is possible only after finishing of the seam.

Number of stitches in bars: Number of stitches is stored in parameter’s number.

No. of parameter Value range Description

of parameter of parameters

000(080) 0-254

Number of stitches of

start (fancy) bar forwards

001(081) 0-254

Number of stitches of

start (fancy) bar backwards

002(082) 0-254

Number of stitches of

end (fancy) bar backwards

003(083) 0-254

Number of stitches of

end (fancy) bar forwards

The drive with the panel V 820 enables sewing automatically up to 40 seams distributed up into eight programmes with the given stitch numbers and sewing direction (forwards/rearwards). For more detailed information see the original driving instructions.

8. Maintenance

Caution! Risk of injury!

Maintenance work can only be carried out when the machine is off and the motor stops.

Maintenance work which must be carried out and the intervals between them and set out in the following table.

Maintenance work Interval Removing throat plate and its cleaning.

Cleaning of circular feed dog, hook and space around feeding wheel of material and thread residues. To clean it, use brush. It is prohibited to use compressed air for cleaning without 1 day protective guards preventing injury of persons

with flying impurities.

Hook lubrication - (one drop of oil). Checking the oil level in the hook

lubrication oil tank. 1 week Checking the oil level in the oil tanks

of the central distribution. 1 month

For the lubrication of this machine Esso SP-NK 10, DA 10 or an equivalent quality lubricating oil is recommended (viscossity at 40° C: 10 mm

/s; flash point: 150°C).

The oil tanks (1, 2, 3) of the central distribution is to be filled the hole (4) up to the mark max.

Page 21

Operating instructions for eventual trouble shooting

Meaning of abbreviations:NP - Instruction manual

SK - Instructions for service

Note: When the machine is driven by a stop motor, it is indispensable to check up, before starting its repair, the setting of its parameters according to NP, part B, par. 5.

Trouble

1. Upper thread breaking.

2. Lower thread breaking.

3. Skipped stitches at the seam beginning after previous thread trimming.

Cause

1.1 Incorrect threading of the upper thread.

1.2 Excessive thread tension.

1.3 Needle incorrectly inserted or damaged.

1.4 Needle thickness does not suit to that of thread or sewn material.

1.5 Hook point sticks the thread.

1.6 Needle thread excessively elastic.

1.7 Low quality thread.

1.8 Needle thickness unsuitable for the hole in the throat plate insert.

1.9 Damaged throat plate insert.

1.10 Incorrect setting of opening bobbin case lifter (little opening).

2.1 Incorrect threading.

2.2 Damaged bobbin.

3.1 Short thread end in needle after trimming (thread too tensioned in the moment of trimming).

3.2 Excessive thread tension.

3.3 Upper thread not squeezed, at the first needle piercing, between sewn material and rear edge of piercing hole.

3.4 Upper thread incorrectly caught by movable trimming knife. Lumps of thread remaining in hook space.

Method of troubleshooting

Thread the upper thread according to NP, par. 6.1.

Set the tension according to NP, par. 6.4.

Replace needle according to NP, par. 6.5.

Use a thicker needle.

Set distance between hook and needle according to SK, par. 3.1.3 and 3.1.5.

Increase the hook timing and set the needle bar height according to SK, par.

3.2.3.

Replace thread.

Replace insert.

Set according to SK, par. 3.1.6.

Thread according to NP, par. 6.3.

Replace bobbin.

Thread upper thread according to NP, par. 6.1. Reduce tension of pretension unit according to NP, par. 6.4. Accelerate slightly OFF position of main tensioner according to SK, par. 4.9; NP, part B , par.

5.2.2, 5.3.2; Mini-stop, par. 5.2.5 - parameter 192.

Set thread tension according to NP, par.

6.4.

Set needle feeding in such a way, so that, with the maximum stitch length, the needle almost touches the rear edge of throat plate insert accordin to SK, par. 3.2.5. Reduce height of wheel feeder according to SK, par. 3.5.3.2.1. Put nearer top roller to needle and shift it rearwards according to SK, par. 3.6.6.2.

Set correctly hook opening according to SK, par. 3.1.6 and adjust setting of trimming cam according to SK, par. 4.3.

Page 22

Use thinner needle.

Insert needle according to NP, par. 6.5.

Set according to SK, par. 3.1.3 and 3.1.5.

Set according to SK, par. 3.1.4 and 3.2.3.

Increase timing as needed and set the needle bar height according to SK, par.

3.2.3.

Replace hook.

Set according to NP, par. 6.4.

Thread according to NP, par. 6.1 set according to NP, par. 6.4.

Thread correctly according to NP par. 6.1.

Set according to SK, par. 3.1.6.

Set wheel feeder height according to SK, par. 3.5.3.2.1.

Shift thread limiter to the right and to the top according to SK, par. 3.4.5 or by more than the value quoted there.

Set tension according to NP, par. 6.4.

Shift thread limiter to the top and to the right according to SK, par. 3.4.5 or more than the value quoted there.

Use a thicker needle.

Reduce tension of both threads.

Engage correctly clutch according to NP, par. 6.10.

Raise feeder more from throat plate according to SK, par. 3.5.3.2.1.

Use feeder with 0.6 mm teeth pitch. Replace according to SK, par. 3.5.3.2.2.

Set chain tension according to SK, par.

3.5.3.2.1.

Thread lower thread according to NP, par.

6.3.

3.5 Needle too thick with regard to thickness of thread and sewn material.

4.1 Needle incorrectly inserted.

4.2 Too big distance between needle and hook point.

4.3 Incorrectly set needle hook timing or needle height.

4.4 Excessively elastic material or excessively elastic thread.

4.5 Damaged hook point.

5.1 Lower thread tension.

5.2 Incorrect threading and tension setting of upper thread.

6.1 Upper thread out of tensioning dishes.

6.2 Opening bobbin case lifter incorrectly set (it opens too little).

6.3 Wheel feeder too low - difficult passage of thread between sewn material and throat plate.

6.4 Upper thread insufficiently tensioned when passing through hook.

7.1 Low tension of upper and lower threads.

7.2 Upper thread insufficiently tensioned when passing through hook.

7.3 Thin needle with regard to thread thickness.

8.1 Thread tension to high for sewn material.

9.1 Overrun safety clutch against hook overload.

10.1 Wheel feeder too low (especially when sewing soft and thick materials).

10.2 Feeder teeth unsuitable (too fine) for sewn material.

10.3 Wheel feeder driving chain too tensioned - blocked feeding.

11.1 Incorrect lower thread threading when replacing hook bobbin lower thread caught by hook point.

4. Stitch skipping.

5. Incorrect stitch locking. Threads are locked on top side of sewn material.

6. Incorrect stitch locking. Threads are locked on bottom side of sewn material and increasing of tension is of upper thread no help.

7. Stitches insufficiently tightened and with irregular positioning. Thread unravelled.

8. Sewn material wavy in seam.

9. Machine does not feed or is feeding slowly or in reverse sense.

10. Difficult and iregular machine feed.

11. Hook blocked.

Page 23

12. No upper thread trimming.

13. No lower thread trimming.

14. Second and third stitches incorrectly locked at the beginning of sewing after previous trimming.

15. Insuggicient quality of trimming.

11.2 Upper thread out of tensioning dishes and 2x caught by hook point.

11.3 Insufficient gap between needle and piercing hole from hook side.

12.1 Incorrectly threaded thread.

12.2 Upper thread excessively braked when moving upwards due to thin needle, thick elastic material, low feeder position, low thread tension.

12.3 Tensioner electromagnet cuts soon main tensioner during trimming.

12.4 Fixed trimming knife does not fit with all its width against movable knife.

12.5 Movable knife does not run over movable knife edge.

12.6 During trimming cycle, safety clutch against hook overload gets disengaged.

13.1 Incorrect movable knife path setting.

13.2 Short movable knife path.

13.3 Incorrect cam setting.

13.4 Incorrect trimming knife height setting.

14.1 Incorrect setting of lower hook thread retaining spring.

15.1 Incorrect setting of the cutting surface (cutting edge) against the edge of the throat plate insert. Incorrect setting of the cutting surface (cutting edge) against the needle. Knife (cutting edge) height incorrectly set - according too the trimmed material.

15.2 Excessive blunting of the knife cutting edge.

Thread upper thread according to NP, par.

6.1.

Set side position of the throat plate post according to SK par. 3.3.3.

Thread the thread according to NP, par.

6.1.

Insert thicker needle according to NP, par.

6.5. Lift wheel feeder according to SK, par.

3.5.3.2.1.

Delay position of cutting the main tensioner according to SK, par. 4.9 and according NP, part B, par. 5.2.2, 5.3.2; Ministop, par. 5.2.5 - parameter 192.

Set knives according to SK, par. 4.7.

Set knife according to SK, par. 4.5.

Increase clutch disengaging moment according SK, par. 3.9.2.

Set knife according to SK, par. 4.5.

Increase path by correct fork setting according to SK, par. 4.4.

Set cam according to SK, par. 4.3.

Set height according to SK, par. 4.6.

Set spring according to SK, par. 4.8.

Set the knife for material trimming according to SK par. 5.3.

Sharpen the trimming knife according to SK, par. 5.7. A correctly sharpened knife trims the material by pulling.

Page 24

Instructions for service

4181i - 1

Minerva Boskovice, a.s., Sokolská 60, CZ - 680 17 Boskovice

Tel.: +420-516-453434, 453433, 494111 Fax: +420-516-452165 http://www.minerva-boskovice.com

Edition: 02/2005 Printed in Czech Republic S735 000674

Page 25

CONTENTS:

1. General safety instructions ............................................................................................................................................................. 1

2. Introduction ............................................................................................................................................................................................ 1

3. Head of the sewing machine ........................................................................................................................................................... 2

3. 1 Hook and hook post ............................................................................................................................................................... 2

3.1.1 Description

3.1.2 Height setting of the hook

3.1.3 Setting the distance of the hook from the needle

3.1.4 Angular setting of the hook (timing)

3.1.5 Protection of the needle and of the hook point

3.1.6 Setting of the bobbin case opener

3.1.7 Setting the regulation of the hook lubrication

3.1.8 Replacement of the hook

3.1.9 Setting the gear

3.1.10 Dismantling of the hook post

3.2 Needle and thread mechanism ............................................................................................................................................... 5

3.2.1 Description

3.2.2 To check the handwheel angular adjustment

3.2.3 Height setting of the needle bar

3.2.4 Side setting of the needle bar holder

3.2.5 Setting the needle (the needle bar holder) in the direction of sewing

3.3 Throat plate and its post ...................................................................................................................................................... 7

3.3.1 Description

3.3.2 Mounting and removing the throat plate and its insert

3.3.3 Side setting of the throat plate post

3.4 Thread tensioners and limiter ............................................................................................................................................. 8

3.4.1 Description

3.4.2 Setting the tension of main and auxiliary tensioners

3.4.3 Setting the tensioning mechanisms of the main tensioners

3.4.4 Setting the adapting spring

3.4.5 Setting the thread limiter

3.4.6 Setting the additional thread limiter

3.5 Feeding mechanism of the needle feed and of the lower feed wheel ........................................................................10

3.5.1 Description

3.5.2

Stitch length mechanism

3.5.2.1 Setting the upper eccentric

3.5.2.2 Setting the prop

3.5.2.3 a Forward and rearward stitch length distribution (rough)

3.5.2.3 b Forward and rearward stitch length distribution (fine)

3.5.2.4 Setting of the control knob (including the stitch length limitation)

3.5.3

Lower feed wheel

3.5.3.1 Feeding clutches

3.5.3.1.1 Description

3.5.3.1.2 Setting the lever of the second step of feeding(angle, position)

3.5.3.1.3 Setting of the lower eccentric

3.5.3.1.4 Setting the engagement and disengagement of the clutches

3.5.3.2 Wheel feeder and its post

3.5.3.2.1 Height setting of the feeder and tensioning of the chain

3.5.3.2.2 Replacement of the feeder

3.5.4

Setting the top roller (pressing force, height)

3.6 Feeding mechanism of the top roller ...............................................................................................................................15

3.6.1 Description

3.6.2 Side setting of the indented lower pulley

3.6.3 Side setting of the indented upper pulley

3.6.4 Setting the tensioning roller

3.6.5 Replacement of the indented belt

3.6.6

Top roller

3.6.6.1 Selection of the top roller diameter

3.6.6.2 Forward, rearward and side setting

3.6.6.3 Setting the gear clearance and in the mounting of the top roller

3.6.6.4 Replacement of the top roller

3.7 Setting the presser foot lift ..................................................................................................................................................19

Page 26

3.8 Bobbin winder ...................................................................................................................................................................... 2 0

3.8.1 Description

3.8.2 Setting the bobbin winder stop

3.8.3 Setting the friction gear

3.9 Safety clutch ......................................................................................................................................................................... 2 1

3.9.1 Description

3.9.2 Setting the disengaging moment

3.10 Indented belt transmission ................................................................................................................................................ 21

3.10.1 Setting the tensioning roller of the indented belt

3.10.2 Replacing the indented belt

3.11 V-belt, motor - head ............................................................................................................................................................ 2 2

3.11.1 Tensioning

3.11.2 Replacing the V-Belt

3.12 Driving toothed belt ............................................................................................................................................................. 2 2

3.12.1 To exchange the driving toothed belt

3.13 Lubrication ............................................................................................................................................................................ 2 3

3.13.1 Description

3.13.2 Refilling oil

3.13.3 Multiple oil use

4. Thread trimming ............................................................................................................................................................................... 2 4

4.1 Description of the trimming mechanism

4.2 Setting the pickup roller

4.3 Setting the cam

4.4 Setting the fork

4.5 Setting the moving knife

4.6 Setting the height of the fixed knife and of the retaining spring of the lower thread

4.7 Setting the fixed knife

4.8 Setting the retaining spring of the hook thread

4.9 Setting switching of the electromagnets

5. Material edge trimming ................................................................................................................................................................ 27

5.1 Description of the trimming mechanism

5.2 Dismantling and assembly of the motor - trimming drive

5.3 Setting of the trimming knife lifting

5.4 Replacement and setting of the trimming knife position

5.4.1 Replacement of the knife and setting of the distance between the knife and the throat plate insert

5.4.2 Setting of the knife position (turning) in the sewing direction

5.4.3 Height setting of the knife

5.5 Setting of engaging and disengaging of the trimming mechanism, of the angaging and carried lever stop

5.5.1 Description

5.5.2 Setting of the engaging lever stop

5.5.3 Setting of the position (shifting) of the carrying lever

5.5.4 Setting of the carried lever stop

5.5.5 Setting of the trimming mechanism engagement

5.5.6 Setting of the torsional moment of the return spring

5.6 Sharpening of the knives

5.7 Sewing without trimming

6. Lifting the top roller by electromagnet ...................................................................................................................................... 3 1

6.1 Description

6.2 Setting the electromagnet pin

6.3 Setting the electromagnet current

6.4 Assembly of the top roller lifting electromagnet

7. Backtacking using electromagnet ................................................................................................................................................ 3 2

7.1 Description

7.2 Electromagnet height setting

7.3 Setting the position of push-buttons

7.4 Change of the function of push-buttons

8. Connecting the electric elements on the machine head ........................................................................................................ 3 2

9. Drive, control panel, position sensor ....................................................................................................................................... 3 2

10. Maintenance (table of operations) ............................................................................................................................................. 3 3

11. Setting the machine according to the sewing category .......................................................................................................... 3 3

11.1 Introduction

11.2 Table of setting the machine according to the sewing category

Page 27

1. General safety instructions

The non-observance of the following safety instructions can cause bodily injuries or damages to the machine.

1. The machine must only be commissioned of the instruction book and operated by persons with appropriate training.

2. Before putting into service also read the safety rules and instructions of the motor supplier.

3. The machine must be used only for the purpose intended. Use of the machine without the safety devices is not permitted.

Observe all the relevant safety regulations.

4. When gauge parts are exchanged (e.g. needle, top roller, needle plate, feed dog and bobbin) when treading, when the

workplace is left, and during service work, the machine must be disconnected from the mains by switching off the master

switch or disconnecting the mains plug.

5. Daily servicing work must be carried out only by appropriately trained persons.

6. Repairs, conversion and special maintenance work must only be carried out by technicians or persons with appropriate

training.

7. For service or repair work on pneumatic systems the machine must be disconnected from the compressed air supply system.

Exceptions to this are only adjustments and functions checks made by appropriately trained technicians.

8. Work on the electrical equipment must be carried out only by electricians or appropriately trained persons.

9. Work on parts and systems under electric current is not permitted, except as specified in regulations DIN VDE 0105.

10. Conversion or changes to the machine must be authorized by us and made only in adherence to all safety regulations.

11. For repairs, only replacement parts approved by us must be used.

12. Commissioning of the sewing head is prohibited until such time as the entire sewing unit is found to comply with EC

directives.

It is absolutely necessary to respect the safety instructions marked by these signs.

Danger of bodily injuries !

Please note also the general safety instructions.

IMPORTANT WARNING

In spite of all safety measures made on the machines, inappropriate actions of the operator may lead to dangerous situations. In

industrial sewing machines Minerva, attention should be paid to the following still remaining possible sources of injury:

1. Moving sewing needle

- risk of injury when sewing with raised pressure foot or top roller, because the finger guard is then positioned too high.

2. Moving thread take-up lever

- risk of injury when inadvertently or intentionally inserting the finger(s) between the thread take-up lever and its guard.

3. Moving pressure member

- risk of injury when holding sewn work in immediate vicinity of the pressure member and beginning to insert under the

pressure member a considerably thicker sewn work portion,

- risk of injury when sinking the pressure member.

4. Moving and also uncovered non-moving trimming knive

- danger of accident when holding and guiding the sewn parts when sewing

- danger of accident when handling the sewn parts even with the switched off trimming mechanism, without having

switched off the main switch

5. When switched off, the clutch motor slows down by inertia but would be reactivated by an accidental treading down of the

motor treadle. To avoid such risk, it is advised to hold the handwheel by hand and slightly to depress the motor treadle.

2. Introduction

This service book contains instruction for regulating the mechanisms of the sewing machine head.

The instructions for use and for putting the machine into operation and for the control of the stopmotor are not included in this

service book, but they are supplied as separate publications.

This service book is universal for all subclasses of the machine - it contains setting procedures for all elements which may be

placed on the machine of the given class. When the supplied subclass of this machine does not include some element, then it is

possible to leave out the respective parts of the instructions. The optional equipments of the machine and the respective

configurations of the subclasses of the machine are given in the operating instructions.

This sewing machine disposes of a large extent of its use. The machine should be set with respect to the parameters of the sewn

material, the sewing thread etc. The setting for the individual categories is given in the chapter 12.2.

For setting the machine, simple setting aids are used which are included in the accessory of the machine. Besides these aids,

universal measuring devices are used, such as slide calliper, feeler gauges and dynamometer for measuring the thread tension.

Page 28

3. Head of the sewing machine

3.1 Hook and the hook post

3.1.1 Description

The hook (1) is mounted on the shaft (2) and is driven by the gear (3)

from the shaft (4).

The shaft of the hook (2) is mounted on the top in a sliding bearing

and, on the bottom, in a needle bearing.

The hook is provided with a lever (6) which is tilted when removing the

bobbin (7). The protecting sheet (8) protects against the collision of

the needle with the hook point. The bobbin case opener (9) is driven by

the eccentric (10) on the shaft (2).

The lubricating tube (11), on which a lubricating wick is fastened in the

tube (12), feeds oil for lubricating the sliding bearing (5) of the eccentric

(10) and the hook path.

The screws (13) serve for taking up the clearance of the gear. The

screws (14) fasten the post to the bedplate.

The lubricating felt (15) is connected by the wick (16) with the lubricating

system and serves for lubricating the gear (3).

3.1.2 Height setting of the hook

The designated distance A should be 5.3 mm.

Caution! Danger of injury!

Switch off the main switch ! Before starting the setting

operation, wait until the motor stops!

- Loosen both screws (2).

- By turning the screws (3 and 4), set the required distanceA.

For

setting up use the setting gauge (7) as per the repective

figure. After having set it, tighten carefully the screws.

- By axial shifting of the gear wheel (5), set the axial clearance in

such a way that this clearance is the least possible, but sufficient for

turning easily the hook.

- Tighten carefully the screws (2). Caution ! One of these screws must

bear on the flat of the shaft 6).

3.1.3 Setting the distance of the hook from

the needle

The hook point (1) is set up to the maximum distance of 0.1 mm from

the bottom of the needle recess (2). For the sewing categories 1 and 2,

the needle size 100 is set, for the sewing category 3, the needle size

140 is set.

Caution! Danger of injury!

Switch off the main switch ! Before starting the setting

operation, wait until the motor stops!

- Remove the covers (3) and (4).

- Screw out the screws (5), and slide the plate (6) out.

- Loosen the screw (7).

- Loosen only one screw (9).

- Loosen the screws (10) and tighten them only slightly.

- Shift the hook post (11) at the determined distance between the

needle and the hook point.

- Tighten carefully the screw (9) (be sure not to damage the threads!)

- Tighten duly the screws (10).

- Check up the setting using a narrow strip of thin paper and proceed

to the eventual correction of setting.

max. 0,1

Page 29

3.1.4 Angular setting of the hook (timing)

The hook is to be angularly set in such a way that the hook point (1) is

opposite the needle at the moment, when the needle shifts by 2.5 mm

from its bottom dead center. This corresponds to the 2O5

° on the scale

of the handwheel (3).

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Remove the throat plate.

- Turn the handwheel (3) to the 2O5

° and fix it with the screw (4)

which is component part ot the accessory of the machine (tighten

it carefully).

- Loosen the screws (5).

- Turn the hook into the required position.

- Set up the distance of about 0,5 mm between the gear wheel (6) and

the pin (7).

- Tighten to the maximum the screws (5).

3.1.5 Protection of the needle and of the hook point

The protecting sheet (1) is to be set up in such a way that the clearance

between the protecting sheet and the needle (2) is the least possible.

Caution ! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Remove the throat plate.

- In deforming the protective sheet (1) set the required play between

the sheet and the needle (2). After having introduced a suitable

screwdriver between the protective sheet and the hook body (3) we

shall reduce the play by levering, in applying the pressure on the

protective sheet in the sense of the arrow (4), we shall increase the

play.

- Check up the protecting effect in pushing against the needle in the

sense of the arrow (5). The hook point must not catch the needle. If

so, set up the protecting effect, correct eventually the setting of the

distance of the hook point from the needle according to the paragraph

3.1.3.

3.1.6 Setting of the bobbin case opener

The bobbin case opener (1) is to be set in such a way that, at the

moment when the opener is in its dead centre, there would be a clearance

A between the opener (1) and the projection (2), whereas the finger

(3) bears on the projection (4), A = 0.7 mm for the sewing category

1 and 2, A = 0.3 mm for the sewing category 3.

Caution ! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Remove the sheet guard of the hook post.

- On the handwheel (5), set the angle of 295

° (the hook is in its dead

centre).

- Loosen the screw (6).

- Turn the eccentric (7) in such a way that the required clearance

between the elements (1) and (2) is attained.

- Set the height of the eccentric (7) in such a way that it is in its

highest position in retaining the minimum clearance between the

slide (8) and the fork (9).

- Tighten duly the screw (6).

205

~ 0,5

295

78 69

Page 30

3.1.7 Setting the regulation of the hook lubrication

By turning the lubricating tube (1) in the sense of the arrow (2), the

size of the contacting surface between the wick (3) and the felt insert

(4) is regulated. In this way, the speed of the capillary lift of oil into the

felt insert (5) is influenced, from which oil is wiped on the surface (6)

and is driven by centrifugal force into the hook path (7).

Setting of full lubrication

- Turn the screw (8) into the position (9).

Setting of limited lubrication

- Turn the screw (8) into the position (10).

After having ended the regulation, set the height of the lubricating tube

(1) at 0.4 mm from the eccentric (11).

3.1.8 Replacement of the hook

Caution! Danger of injury!

Switch off the main switch ! Before starting the setting

operation, weit until the motor stops!

- Remove the throat plate and the trimming knife.

- Unscrew the screws (1) and remove the gib (2).

- After having suitably turned a bit the hook, remove the bobbin case

(3).

- Unscrew thorougly the screw (4).

- Remove the body of the hook (5) upwards.

- When mounting, the procedure is inverse.

3.1.9 Setting the gear

The mutual angular orientation of the gear wheel (1) relative to the gear

wheel (2) should ensure the accessibility of the screw (5) at the moment

when the hook point comes to lie opposite the needle (4). The wheel

(2) is to be set with its gear rim symmetrically to the centre of the gear

wheel (1). The clearance between the gear wheels is to be the least

possible.

Caution ! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Set the angle of 2O5

° on the handwheel (6) and lock it with the

screw (7).

- On the removed post of the hook (8), according to the pa-ragraph

3.1.10, the hook point (3) is to be turned a bit according to the

illustration.

- Turn the gear wheel (2) into the suitable position and insert the post

of the hook into the machine according to the respective arrows.

Check up, whether the screw (5) is accessible and, if not, repeat the

procedure.

- Set the the distance of the hook from the needle according to the

paragraph 3.1.3.

- Set the precise angular displacement of the hook according to the

paragraph 3.1.4.

- Loosen the screw (10) and tighten them slightly.

- Set the clearence in the gear in turning the screws (9). Check up,

whether the gear has a clearance during the whole revolution of the

hook. Turn the handwheel step by step by 15

° and, with each step,

grasp the hook and try, if there is an angular dead travel. Tighten

carefully the screws (9).

- Tighten duly the screws (10) and try anew the clearance of the gear.

0,4

205

~0,5

Page 31

3.1.10 Dismantling of the hook post

When dismantling the post (1), the supplies of lubricating oil are to be

disconnected first, the fastening screws unscrewed and, thereafter, the

post is removed.

Caution ! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Remove the covers of the post.

- Unscrew the screw (2).

- Push the lubricating tube (3) downwards into the post.

- Unscrew the screw (7) from the oil tank (8) and pull the tank out

from the machine.

- Disconnect the hose with the wick (9) from the oil tank (8).

- Screw out the screw (4) of the lever (10) on the shaft of the trimming

knife (11). Loosen the screw (12), turn the lever (10) as indicated by

the arrow, and take it out of the shaft.

- Loosen the screws (13) of the microswitch holder.

- Loosen only one screw (5).

- Unscrew the screws (6).

- Shift the post in the sense of the arrows and remove it out from the

machine.

- When mounting it, proceed inversely.

3.2 Needle and thread mechanism

3.2.1 Description

The take-up lever (1) is mounted in ball bearings, both at the spot of its

suspending on the connecting rod (2) and in the mounting on the loop

(12). The take-up lever is of aluminum and is provided with a stuck-in

eye for two threads. The connecting rod (2) is mounted on the eccentric

pin (3). The needle rod holder (4) is mounted through the pivot (5) in

a rotating way in the arm (6). In its top part, the holder is guided by the

guide pin (7). The movement for the needle feed is given to it by the

connecting rod (8) driven by the feeding shaft (9). The connecting rod

(8) is mounted by pin (13) with needle bar holder (4).

The connecting rod (10) of the needle bar (11) on the loop (12) is

mounted in a ball bearing and it is slidingly mounted on the needle bar

carrier. The mechanism is lubricated by means of a central-wick

lubricating system.

3.2.2 To check the handwheel angular adjustment

The handwheel (5) must be situated in its precise position relative to

the needle and thread mechanism. This position is given by a pin (2),

which locks the connecting rod of the needle rod (1) through a hole in

the arm (3). In this position, the indicator (6) of the handwheel must

show O. The position is fixed by the handwheel screw (4) contacting

a small flat surface provided on the upper shaft.

The correct adjustment of the angular position has been car-ried out at

the producers.

Caution ! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

Page 32

3.2.3 Height setting of the needle bar

At the moment, when the hook point passes around the needle, the

upper edge of the needle eye must be about 1 mm below the hook

point. In an opposite case, it is necessary to set the height of the needle

bar as follows:

Caution ! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Remove the front guard.

- Loosen the screw (1) of the needle bar carrier

- Set the correct height of the needle bar and tighten anew the screw

(1).

Caution !

An incorrect setting of the needle bar height may cause

the striking of the hook point against the needle.

3.2.4 Side setting of the needle bar holder

The correct position of this holder is in such case, when the needle bar

is lined up with the presser-foot bar. The needle bar holder can be set

as follows:

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screw (1) of the pin (2).

- Loosen the screw (3) of the guide pin (4).

- In shifting the pin (2) set the needle bar holder on the measure A

= 8 mm (distance between the front face of the arm and the front face

of the safety bolt (5) of the needle bar holder) /at the same time the

pin (4) shifts/.

- The guide pin (4) is to be set in such a way that the needle bar holder

moves easily.

- Tighten the screws (1 and 3).

3.2.5 Setting the needle (the needle bar holder)

in the direction of sewing

When shifting out the needle from the throat plate insert, at the moment,

when the needle eye is at the level of the top surface of the throat plate

insert (3), the distance between the needle and the wall of the throat

plate insert must be A = 0.2 mm.

Caution ! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Set the maximum allowed stitch length.

- Set the handwheel (1) to the angle of 244° and lock it with the screw

(2).

- Loosen the screw (4) of the lever (5).

- By turning the needle bar holder (6) on the pin (7) set the required

distance A = 0,2 mm.

- Tighten up the screw (4) and check up the setting.

Caution!

A faulty setting may cause bending or breaking of needles

against the throat plate insert.

244

Page 33

3.3 Throat plate and its post

3.3.1 Description

The throat plate (1) is equal for all categories of sewing. In the throat

plate there is fixed by means of two screw (3) the exchangeable throat

plate insert (2). Each category of sewing has its own insert of the throat

plate which differ one from another by the length and width of the

piercinghole.

3.3.2 Mounting and removing the throat plate and

its insert

When mounting the throat plate (1), the finger of the hook (2) must fit

into the recess (3) of the throat plate. When demouting or replacing the

throat plate insert (4), both screws (5) are to be unscrewed and the

insert romoved.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Turn slightly the finger (2) in the sense towards the throat plate (1).

- Place the throat plate (1) and screw in the screws (6).

- Place the insert (4) and screw in the screws (5).

3.3.3 Side setting of the throat plate post

The post of the throat plate (1) is to be side set in such a way that the

axis of the hole in the insert of the throat plate (2) is at the distance A

= 0.1 mm to the right from the axis of the needle (3).

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screws (4 and 5) (from the rear side of the post as well).

- Shift the post (1) in the sense required for attaining the distance A

= 0.1 mm.

- Tighten the screws (4 and 5) and check up for the correct setting.

Page 34

3.4 Thread tensioners and limiter

3.4.1 Description

The main tensioners (1) serves for creating the tension of the thread

when tightening the stitch. The auxiliary tensioner (2) reduces the risk

of pulling out of the thread after the thread trimming when removing

the sewn material, when the thread is passed through this material and

when the main tensioner is relieved. The main tensioner is relieved by

the mechanism controlled by the shaft of the presser bar lifting (3)

holding the lever (4) with a pulley. The motion is then transmitted by

the lever (5) and the tie rod (6) on the thread tensioner plate (7) whose

displacement (motion) relieves thethread tensioner springs (8). In

machines provided with a thread trimming device, the main tensioners

(1) are relieved as well upon the switching on of the electromagnet

(10) whose electromagnetic field will attract the thread tensioner plate

(7). The mechanism of the adapting spring (12) maintains the upper

thread in its tensioned state when passing through the hook and when

entering the needle into the sewn material. The thread limiter (13)

limits the length of the thread fed by the take-up lever when moving

from the upper to the bottom dead centre to get a controlled passing of

the thread through the hook. The auxiliary guide (14) maintains the

upper thread in front of the needle in a tensioned condition and helps

against pulling the thread from the needle after thread trimming.

3.4.2 Setting the tension of the main and auxiliary

tensioners

The tension of the main thread tensioners is regulated by means of the

nuts (1). The force of tensioning the thread is measured by the

dynamometer (2) as it is shown on the illustration. The size of this

force differs according to the category, and its orientation value is

indicated in the par. 11.2.

The tension of the auxiliary tensioner is regulated using the nut (3). It

should be the least possible, but sufficient for unthreading the thread

from the sewn material when removing the sewn material from the

pressing element without leaving the tensioner.

3.4.3 Setting the tensioning mechanisms

of the main tensioners

In the rest position of the tensioners, when pushing the plate of the

tensioners on the spot A 3.4.1, this plate must have the socalled dead

travel of about 0,5 mm. At this lifting, the tension discs of the tensioners

must not be relieved. This can be attained by a suitable shaping of the

relieving disc of the tensioners-this has been set up in the manufacturing

factory. In the maximum opened position of the tensioners, the plate of

the tensioners, when pushing it at the spot A 3.4.1, must still have

the minimum lifting. This can be attained when axially shifting the lever

(3) with the roller (5) on the shaft (4).

The disengagement of the main tensioners must be coordinated with

the top roller lift. To achieve this, turn the lever (3) with the roller (5) on

the shaft (4). The movement of the roller (5) on the slanting surface (6)

of the lever (7) disengages the tensioners. In this way, also alag of the

upper thread tension disengagement after the top roller lift can be

obtained.

Caution ! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Remove the rear cover with the top roller lift magnet.

- Loosen the screws (1) and (2) of the lever (3).

- In the rest state of the machine (with not relieved tensioner discs) set

the lever (3) in turning it slightly on theshaft (4) to a position in

which the roller (5) of the lever (3) is in contact with theslanting

surface (6) of the lever (7) and is about 0.1 mm distant from the flat

surface (8) of thelever.

- At the maximum lift of the top roller, the roller (5) moves on the flat

surface (9) of the lever (7); in this condition, there must be a minimal

play at the tensioner plate lift (when pushing qat the spot A (3.4.1),

the plate must still have a minimum lifting - between the roller (5)

and the surface (9) there is a minimum clearance). Retighten the

screws (1) and (2), check the play, and correct it in case of need.

4 1 7

3 2

0,1

Page 35

3.4.4 Setting the adapting spring

The mechanism of the adapting spring is in the machine arm set by the

pin (1) and fixed by the screw (2). The axial adjustment shall ensure

that the surfaces of the parts (3) and (4) are aligned (the threaded

thread must in no place break on edges). The initial position of the

adapting spring (5) shall ensure that B = 1 to 1.5 mm (see the

Figure).

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screw (2) and take the mechanism out of the machine

arm.

- Turning the body (6) relative to the pin (1), set the required initial

position of the adapting spring /the screw (7) has been set at the

producer´s so as to permit the turning movement of the body (6) the

screw must not be fully tightened/.

- During the installation of the mechanism into the machine arm take

care of the axial adjustment of the mechanism.

- Retighten the screw (2) and check the adjustment.

- Loosen the nut (8) of the mechanism, insert a screwdriver into the

notch of the screw (9) and set the required value of the adapting

spring. By turning the screw clockwise you increase the spring

force, and vice versa.

- Retighten the nut (8) and check the function of the adapting spring.

3.4.5 Setting the thread limiter

The thread limiter is to be set in such a way that, when sewing and

passing the thread through the most distant point of the hook, the

spring (2) shifts by about 1/4 to 1/2 length of its total length. This

means that the thicker will be the sewn material and the longer will be

the stitch length, the more will be the limiter shifted in the sense of the

arrow and inversely. Under standard sewing conditions, the thread

limiter is set in its tested positions depending on the sewing category

in accordance with the chapter 11.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Tighten the screw (3).

- Set the thread limiter (1) so as to ensure a minimum motion of the

adapting spring (2) when the thread passes around the bottom of

the hook.

- Tighten the screw (3).

3.4.6 Setting the additional thread limiter

For improving the uniformity of stitch interlocking with some (e.g. too

thin) materials, the machine is provided with an additional thread limiter

which is to be set as follows:

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Set the stitch length to the required value.

- Sew an approximately 5 cm long seam along the edge of sewn work,

switch off the machine, and tilt away the hook cover.

- Rotate the handwheel until the thread taken up by the hook will be

stretched across its bottom, i.e., across the full diameter of the hook.

- Adjust the position of the additional limiter (1) so as to obtain an

almost complete stretching of the thread (2) at that moment, as shown

in the drawing.

- Sew next stitch and check the adjustment.

Page 36

678

143

3.5 Feeding mechanism of the needle feed

and of the lower feed wheel

3.5.1 Description

The feeding mechanism is formed by the leverage (1) which is driven

from the main shaft through the eccentric with connection rod (2). The

feeding motion is transmitted by the shaft (3) on the clutch of the

bottom feed (7).

The engaging and the disengaging function of the clutch (7) is controlled

from the lower shaft (8) through the eccentric with the connecting rod

(9) and through the wedge coupling (10).

The feeding movement is transmitted by the shaft (11) through the

chain transmission (12) onto the wheel feeder (13).

The stitch length is set by the knob (14) through the leverage (15) to

the feeding mechanism (1).

3.5.2 Stitch length mechanism

3.5.2.1 Setting the upper eccentric

The eccentric (1) must be set in its angular position in such a way that

the horizontal component of the needle motion is in a phase delay from

the vertical component of this movement. This refers to the angle of

90° on the handwheel (2), when the setting stick (3) is engaged into

the eccentric (1) and leans from above against the feeding shaft (4).

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Set the angle 90° on the handwheel (2) and fix it with the screw (5)

which is component part of the accessory of the machine (tighten it

with care).

- Loosen the gripping joints of the levers (6) and (7).

- Turn the feeding shaft (4) in such a way, so that the recesses (flats)

point towards the bedplate (owing to the unambi-guous setting of

the eccentric by means of the setting bar).

- Insert the setting bar (3) into the hole in the eccentric (1) and prop

it from above against the feeding shaft (4).

- Shift axially the eccentric (1) on the shaft into its extreme positions

and place it in the middle.

- Tighten the screws of the eccentric (1) to the maximum (one screw

first and, after having turned slightly the hand-wheel, the second

screw as well).

- Turn the feeding shaft (4) back into the position for setting the

leverage in such a way, so that the levers (10) of the mechanism pass

in the spots of the recesses.

- Tighten the gripping joints of the levers (6) and (7).

- Test the sufficient clearance in the recesses of the feeding shaft (4)

and, using the levers (10) with the maximum stitch length forward

and rearward  push against the reverse stitching lever.

- Correct eventually the position of the feeding shaft.

3.5.2.2 Setting the prop

In this machine with a wheel feed, the prop (1) is mounted in the pits

(A and C) as per the drawing.

3.5.2.3aForward and rearward stitch length

distribution (rough)

The cam (1) is to be set at the respective angle in such a way that the

stirrup (6) is oriented in such a position, so that the connecting rods (7

and 8) are in a line with a thoroughly screwed in knob (9) and with

turning the handwheel at 0°. This setting can be done only after having

set the top eccentric according to the paragraph 3.5.2.1.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Set the zero stitch /screw in the knob (9) to the bottom of the cam

(1)/.

- Set the angle 0° on the handwheel and lock it with the screw (4).

- Turn the screw (3) in the respective sense in such a way that the

connecting rods (7 and 8) are in a line and tighten the screw (2).

Page 37

3.5.2.3bForward and rearward stitch length

distribution (fine)

When setting the maximum length of the stitch, the forward and the

rearward stitch length must be equal with the maximum error of ± 5 %.

This setting can be done only after having set the needle bar holder in

the direction of sewing (par. 3.2.6) and the wheel feed (par. 3.5.3.1.2).

Caution! Danger of injury!

switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Set the maximum stitch length .

- Place a suitable material under the presser foot and mark therein the

forward and the rearward stitch length.

- With an unequal length of the stitch, proceed to the correction

of setting by turning the screws (2 and 3). When tightening the

screw (3), the forward length of the stitch is shortened and inversely.

When tightening the screw (2), the forward stitch length is lenghtened.

Each time first loosen one screw and then retighten the

other one.

3.5.2.4 Setting the control knob

(including the stitch length limitation)

The control knob (1) is to be set up in such a way that, when turning it

in counterclockwise sense up to the stop, the maximum stitch length

valid for the given sewing category is attained (cat. 1: 3 mm, cat. 2 and

3 : 5 mm). The scale of the control knob is to be oriented in such a

position, so that the scale end corresponds to the maximum stitch

length, excepting the first sewing category, where the stitch length of

the indicator is 3 mm.

Caution! Danger of injury

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Screw in the screw of the control knob in such a way, that the

spherical surface of the screw (3) bears on the seat of the cam (4).

- Loosen the screw (5) and turn the control knob in the clockwise

direction, until the pin (6) of the knob (1) bears on the pin (7).

Tighten firmly the screws (5).

- Turn the knob in the counterclockwise direction up to the stop, when

the pin (6) of the knob (1) bears on the pin (7).

- In a sewing test check up the length of the stitch, if this corresponds

to the maximum stitch length valid for the given sewing category.

- If the stitch is longer, loosen then the screws (5) and turn the knob

in the clockwise direction and inversely. Tighten firmly the screws

(5).

- Insert a screwdriver into the hole (8) of the scale (2) and adjust the

scale in such a way that the maximum length on the scale is against

the marking of the stitch length on the machine arm.

- For the sewing category 1, set the control knob (1) on the stitch

length of 3 mm and check it by a sewing test.

- Loosen the screws (5) and turn the control knob (1) in the

counterclockwise direction, until the pin (6) of the knob (1) bears

on the pin (7). Tighten firmly the screws (5).

- Put a screwdriver into the hole (8) of the scale (2) and adjust the

scale in such a way that the value of the stitch length on the scale

against the marking on the arm is 3 mm.

Page 38

3.5.3 Lower feed wheel

3.5.3.1 Feeding clutches

3.5.3.1.1

Description

The feeding clutch is formed by the clutch cover (1) driven from the

connecting bar (2), by the clutch star (4) driven from the connecting

rod (3) and by the carrier plate (5) firmly connected with the shaft (6).

Of the clutch give the connecting rods (2 and 3) an opposite direction

swinging movement. The clutch is coupled by means of the wedge (7)

on the connecting rod (8) through the eccentric (9) which is placed on

the lower shaft (10).

In the position, when the wedge is disengaged, the star (4) is

shifted out from the frictioning engagement with the lining of the carrier

plate (5) by means of the spring washer (11). The plate (5) lining is

then pushed by means of a flat profiled spring (12) against the cover of

the clutch (1).

In the position, when the wedge is disengaged, the star (4) is

pushed against the plate (5) lining and, at the same time, the friction

connection with the cover of the clutch (1) is disconnected. Within a

short instant, when engaging and disengaging with the carrier plate

(5), there are in a friction engagement both the cover (1) and also the

star (4), namely in the dead centre of the connecting rods (2 and 3).

The setting of the change-over of clutches is done by tightening or by

loosening the nut (13).

3.5.3.1.2 Setting the lever of the second step of

feeding (angle, position)

The lever of the second step (1) must be set in such a way

that, in the bottom dead centre of the needle, the axis of the

spider part (2) lies in the screw axis (3).

The pin screw (4) can be

mounted into the position - 4.1 - corresponds to the maximum stitch

length of 5 mm.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

Lever (1) displacement.

- Loosen the screw (6).

- Set the maximum stitch length.

- Set the angle 180

° on the handwheel.

- Unscrew the screw (5) and put the needle shank in its hole.

- Turn the lever (1) until the needle drops into the clutch disk (2).

- Side set the lever (1) to the measure A= 0.5 to 1 mm.

- Tighten the screw (6).

- Screw in the screw (5) and seal it with the Loctite cement.

4.1

Page 39

3.5.3.1.3 Setting of the lower eccentric

The rotation of the eccentric (3) must be delayed in phase by 1/4

revolution against the rotation of the eccentric of the stitch length. This

corresponds to the angle of 244

° on the handwheel (1), when the

setting pin (4) is put into the eccentric (3) which is in contact with the

indented belt (5).

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Set 244

° on the handwheel (1) and lock it with the screw (2), which

is included in the accessory of the machine (tighten it carefully).

- Put the setting stick (4) into the hole in the eccentric (3) and prop it

from below against the indented belt (5).

- Set eccentric (3) axially.

- Tighten it the utmost the screws of the eccentric (6).

- By means of the handwheel, turn the eccentric (3) into the marked

position and check in this position the clearance A = 0.05, proceed

eventually to its correction by a new side setting of the eccentric.

3.5.3.1.4 Setting the engagement and

disengagement of the clutches

The nut (7) is to be side set in such a way that the shifting of the

clutches is done at the moment when the clutch disks (3) do not move,

which means, when they are at the dead center of their oscillating

movement. This corresponds to the angle 90

° on the handwheel.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screws of the indented pulley of feeding and shift it to the

left.

- Set the maximum stitch length.

- Set the angle 90

° on the handwheel (1) and lock it with the screw

(2). which is included in the accessory of the machine (tighten it

carefully).

- Loosen three screws (6) in the nut (7) and unscrew it by 2 mm to the

left.

- Tighten slowly the nut (7), until it strikes against the axial bearing

(9). (At this moment, the tightening moment increases in jumps)

and tighten the screws (6).

- Set the the handwheel on 85

° and push the backtacking lever, the

feeder is to turn against the movement of the needle. Set then the

handwheel on 95

°, the feeder is to be turned in the sense of the

needle movement. If not being so, correct the side setting of the nut

(7). When the clutches shift too soon, turn a bit the nut (7) to the

right and inversely.

- Tighten the screws (6).

- Return the indented pulley in its original place according to the

paragraph 3.6.2.

244

Page 40

3.5.4.2 Wheel feeder and its post

3.5.4.2.1 Height setting of the feeder and tension-

ing of the chain

The wheel feeder (1) is to be set in such a way that the points of its teeth

overtop the insert of the throat plate by X= 0.3 to 0.7 mm. When

sewing soft and thick materials, it is necessary to increase the value

X, until a good quality of feeding is attained, but only to the measure

of not deteriorating the beginning of sewing after the carried out thread

trimming. Set the height of the feed dog using a setting gauge.

With every correction of the teeth height, the tension of the chain (2) is

to be corrected.

Caution! Dangere of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screw (3).

- Loosen the screw (4).

- Loosen or tighten the screw (5) and push simultaneously with

finger the feeder (1) downwards, until the required height of the

teeth X of the wheel feeder is attained.

- Tighten then still the screw (5) by 45

° (1/8 revolution).

- Tension the tensioner (6) up to the stop. Be careful in side shifting it

to the centre of the chain. Tighten the screw (3).

- Loosen the screw (5) by 45

° (1/8 revolution), into its original

position. In this way, the optimal clearance of the chain transmission

is attained.

- Tighten the screw (4).

- Correct the set height of the top roller according to the par. 3.5.4.

Page 41

3.5.3.2.2 Replacement of the feeder

For the replacement of the wheel feeder (change of the wheel feeder

according to the machine setting - see par. 11.2 - setting of the machine

- feeder - pitch of the teeth).

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Unscrew the screws (1) and remove the throat plate (2).

- Unscrew the guard (7).

- In pulling upwards (securing by a spring), pull out the feeder (3)

with the guide (4).

- Replace the feeder (3).

- Insert the feeder with the guide into the groove of the holder (5).

- Mount the throat plate (2) and tighten up the screws (1).

- Check up, if the spring (6) pushes the guide (4) with the feeder (3)

against the wheel (8).

- In the opposite case, loosen the screws (9), tense up the spring (6)

in such a way,so that the guide (4) with the feeder (3) is pushed

against the wheel (8) and tighten the screws (9).

- Mount the guard (7) and tighten the screws.

3.5.4 Setting the top roller (pressing force, height)

When lowering the top roller (1), set the clearance A between the

feeder (5) and the top roller to the maximum of 0.2 mm. Set the pressing

force of the top roller (1) so as to avoid the slippage of the sewn material

when feeding it.

Method of setting the height of the top roller:

- Lower by hand the presser bar (3) with the top roller (1) above the

wheel feeder (5).

- Loosen the screw (4) and set the required value A=0.2 mm.

- Tighten the screw (4).

Setting the force of the top roller (1).

- In screwing in the screw (2),the force of the top roller is increased and

inversely.

3.6 Feeding mechanism of the top roller

3.6.1 Description

The starting movement for the drive of the top roller feeder is the

bottom feeding shaft. From this shaft, the movement is transmitted by

the indented belt (1) onto the top feeding shaft (2). A component part

of the transmission by indented belt is the pulley (3), the tensioning

roller (4), the roller (5) and the pulley (6). Starting from the shaft (2),

the movement is further transmitted through the wheels (7 and 8)

ontothe articulated shaft (9). From this articulated shaft, the movement

is transmitted by a cone transmission, situated in the holder (10), onto

the feeder wheel (11). The shaft of the wheel (8) is mounted in the

screw (12) on bearings. The articulated shaft (9) contains two joints

(15) and a telescopic part (16). Both these

elements secure the lifting

and the tilting of the top roller.

8131214

Page 42

3.6.2 Side setting of the indented lower pulley

The pulley must be set up in such a way that the belt passes through the

centre of the passing hole in the bedplate. The setting operation is to be

done as follows:

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screws (1) of the pulley (2).

- Loosen the screw (3) of the tensioning roller (4)

- Set the pulley (2) in such a way that the belt (5) passes through the

centre of the passing hole in the bedplate (6).

- Tighten the screws (1).

- Set the tensioning roller (4) axially in such a way that the belt (5) is

set at the middle of the tensioning roller (4).

- Set the tensioning roller (see par. 3.6.4).

- Tighten up the screw (3) of the tensioning roller (4).

3.6.3 Side setting of the indented upper pulley

The pulley is to be set in such a way that the indented belt is not crossed

and the pulleys are in line. The setting thereof is to be done as follows:

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screws (1) of the pulley (2).

- Set the pulley (2) in such a way that the distance of 5 mm is attained

in accordance with the illustration.

- Tighten the screws (1).

3.6.4 Setting the tensioning roller

The tensioning roller of the indented belt of the top feeding is mounted

in a rotary way on the bedplate. The belt must be ten-sioned as needed

in such a way that there is ensured the correct function of the

transmission. Insufficient tension can cause skipping of the teeth, on

the contrary, excessive tensioning enormously loads the mounting of

the top shaft. The setting thereof is to be done as follows:

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screw (1) securing the lever of the tensioning roller (2).

- Tension the belt as needed (theoretically, in applying the force of 10

N in the middle of the belt with the deflection of 4 mm).

- Tighten the screw (1).

Page 43

3.6.5 Replacement the indented belt

Before replacing the indented belt, the bottom feeding shaft is to be

removed. The procedure is as follows:

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screw (1) of the tensioning roller (2) and loosen it.

- Loosen the screws (3) of the pulley (4) and shift it to the left in such

a way that the screws (5 and 6) of the feeding clutch (7) are accessible.

- Loosen the screws (5 and 6).

- Loosen the screws (8) of the axial ring (9).

- Loosen the screws (10) of the chain wheel (11).

- Push the shaft (12) to the left in such a way that it is out of the pulley

(4).

- Remove the pulley (4).

- Remove the front guard.

- Loosen and unscrew the screw (14) of the holder of the wheel (15)

and remove it from the holder (21).

- Loosen the screws (16 and 17) of the holder (18).

- Remove the holder (18) together with the holder (15) and articulated

shaft (13) from the machine.

- Loosen the screws (19) of the pulley (20).

Loosen the screw (24) of the ring (25).

- Hold the pulley (20) and pull out the feeding shaft (22) from the arm

in such a way that it is possible to remove the indented belt (23)

from the arm of the machine.

- Replace the belt with a new one and proceed to the assembly (inverted

procedure of dismantling).

- Proceed to the setting operation according to the par. 3.6.2, 3.6.3

and 3.6.4.

1110

438

Page 44

3.6.6 Top roller

3.6.6.1 Selection of the top roller diameter

The machine can be supplied with two types of top roller, namely with

the diameter of 25 mm and with the diameter of 35 mm. The suitability

of the diameter used depends on the type of sewing and on the concrete

technological operation.

There are in general valid the following principles for the selection of

the wheel diameter:

ø 25 mm - for sewing small radii ø 35 mm - for sewing straight sections or big radii

- for sewing with great passages to thicker materials

3.6.6.2 Forward, rearward and side setting

The top roller must be in a defined position in relation to the needle:

a) view (see Fig. 1) - the value X depends on the diameter of use top

roller (

ø 25 - 6.5 mm; ø 35 - 10.5 mm), it is measured from the the

needle bar up to the roller edge when turning the handwheel to the

180

° of the scale against the indicator

b) view (see Fig. 2) - the wheel edge must fit with the edge of the needle

operture at the spot of the needle punch.

These values are to be set as follows:

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screw (1).

- By shifting the holder (2) with the top roller (3) in the groove of the

holder (4) set the required value X and tighten the screw(1).

- Loosen the screw (5)

- By shifting the holder (2) in the holder (6) set the bottom edge of the

roller to the edge of the needle operture.

- Tighten the screw (5).

3.6.6.3 Setting the gear clearance

and in the mounting of the top roller

In the cone gear of the drive of the top roller foot, the minimum clearance

must be set. A too small clearance will increase the friction resistance

of the gear, the excessive clearance will influence the inaccuracy of

feeding. The top roller itself is mounted on balls. With this type of

mounting,it is also necessary to set the minimal possible radial

clearance.

The given clearances are set as follows:

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

Clearance in the wheel mounting

- Loosen three screws (5) /only slightly/.

- Using the screw (4) set the minimum clearance in the top roller

mounting (2) /it must easily rotate without any rubbing and with a

minimum clearance/.

- Tighten the screws (5), check the set up clearance, even-tually, repeat

the setting procedure.

Clearance in the conic gear

- Loosen the screw (1), in shifting the wheel, resp. the holder (3) in

the holder groove (6), set the minimum clearance, the pinion (7)

must be pushed up to the holder bottom (6).

- Tighten the screw (1), check the set up clearance.

Fig. 1

Fi. 2

Page 45

3.6.6.4 Replacement of the top roller

When replacing the top roller, proceed as follows:

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Unscrew the screw (1).

- Unscrew the screw (3) with the washer (2).

- Remove the driven top roller with the holder (4) from the holder (5)

and from the articulated shaft (6).

- Mount another top roller in inverted procedure to dismantling.

- Set the top roller according to the par. 3.6.6.2.

3.7 Setting the presser foot lift

The maximum lift of the presser foot when lifting the foot with knee

lever or with electromagnet is to be A = 12.5 mm.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Place a cube (1) having the height of A = 12.5 ± 0.7 mm under the

presser foot.

- Screw in thoroughly downwards the screw (2).

- Tighten slightly the screw (3) in such a way that the lever (4) turns

on the shaft (5) with a certain friction moment.

- Push with the screwdriver on the lever (4), until it attains the wall

inside the arm of the sewing machine.

Return the lever (4) back by about 1 mm and tighten the

screw (3). With the maximum top roller lifting, the lever will

not strike into the machine arm.

- Check the axial clearance of the shaft (5) which should be the least

possible.

- Using the screw (2) set the normal pressure force of the presser foot.

Page 46

3.8 Bobbin winder

3.8.1 Description

The winder (bobbin winder) winds a reserve of the hook thread.

It is driven by a spring-mounted friction gear, which stops after having

filled the bobbin.

An ideal winding is attained with a sufficient pretension of the thread

obtained on the thread guide (4) and with 1 mm under the diameter of

the bobbin. The shaft is mounted in a swinging way and the friction

gear is put into engagement by means of a pickup lever (1) and a cam.

The winder is fixed on the machine arm by two screws (3). The thread

is passed through according to the illustration, the thread is cut off

after having stopped the winding operation using the cutting device

(5).

3.8.2 Setting the bobbin winder stop

The moment of interrupting the winding is determined by the mutual

position of the pickup lever (1) and the cam (5) on a common shaft.

The cam is locked in its functional position by the screw (6). The

mutual position is to be set on a not incorporated winder in such a way

that in the moment, when the pickup lever leaves the space of the

bobbin, the pressing function of the cam on the winders shaft is

interrupted and it moves in the sense of the arrow. A fine setting is to

be done on an incorporated condition in the machine. Using the screw

(2), the position of the friction part of the pickup lever (1) is adapted. In

opening the lever, the stopping function is accelerated. Its inverse

function delays it. A test is to be done after having inserted the bobbin,

when passing the thread through the device and when winding at the

running of the machine.

3.8.3 Setting the friction gear

The friction gear is formed frontally by the disk (8) on the main top

shaft of the machine and by the disk (7) with a rubber ring on the shaft

of the winder.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Proceed to the setting operation with a removed rear guard.

- The winder is in its stopped position.

- Loosen two screws (9) in the disk (8) through the hole in the arm.

- By shifting axially the disk in the sense A, B, set the disks of the

winder (7) at the distance of 0.5 mm from the rubber ring.

- Tighten the screws (9) in the disk (8).

- Put the winder in its working position and proceed to a winding test.

- Mount the rear guard.

Page 47

3.9 Safety clutch

3.9.1 Description

The machine is provided with a safety clutch which enables the turning

through of the lower belt wheel (1) on the hub of the lower shaft (2),

when the hook is blocked. This blocking occurs due to the penetration

of thread into the hook path. With current running, this clutch should

not disengage during the normal running. The mutual coupling of the

belt wheel (1) and the hub (2) is effected by means of the bills (3)

which are firmly connected with the belt wheel (1). The bills fit in the

conic holes of the hub (2) and are pushed therein by means of the

springs (4).

Putting the clutch in its working position, eventual checking its correct

position are to be done in blocking the hook using a screwdriver and in

turning a bit the handwheel.

3.9.2 Setting the disengaging moment

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

The correct value of the tensioning moment (8 Nm) has been set up by

the manufacturer. when this value is lower, in a current running, the

clutch may disengage. In an opposite case (the moment is higher), the

clutch will not disengage. In both cases it is necessary to proceed to a

correction of the moment. In turning the nut (5) to the right, the moment

will increase and on the contrary. The value of the tensioning moment

is very sensible to the turning of the nut (5). When setting it, it is

necessary to proceed very carefully, set it up only in emergency cases!

Check the moment using a torque-limiting wrench.

Caution!

The clutch guarantees only one mutual position

of the hub of the lower shaft (2) and that of the

belt wheel (1). No checking according to the gauge marks

is needed. Putting the clutch out of operation by excessive tightening

of the nut (5) can cause, when blocking the hook, the destruction of

the gear within the drive of the hook.

3.10 Indented belt transmission

3.10.1 Setting the tensioning roller of the

indented belt

The optimum tension of the indented belt (1) is attained in setting the

tensioning roller (2) in such position, when the roller applies the

pressure of F = 20 N against the belt. The roller must be side set in such

a way that the edge of the indented belt does not overlap over the edge

of the roller.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Remove the handwheel and the belt guard, remove the V-belt.

- Unlock the fastening of the loop, on which the roller (2) is mounted

in such a way that the loop turns freely.

- Lift the roller (2) upwards and, thereafter, using the dynamo-meter

(4), pull horizontally the roller in applying the force of 2O N. In this

position, tighten the fastening screw (3).

- Check the side shifting of the roller.

Page 48

3.10.2 Replacing the indented belt

To observe: in machines with Mini-stop first remove the driving toothed

belt as instructed in par. 3.12.

When replacing the indented belt, the mutual position of the pulleys (4

and 5) should be maintained.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Remove the handwheel, the belt guard and the V-belt.

- Remove the retaining ring (1) and remove the backtacking lever (2).

- Mark with a pencil the instantaneous position of the indented pulleys

against the machine head in any position.

- Remove the indented belt (3) from the bottom indented pulley

(4) first, and then remove the whole belt.

- Apply a new indented belt on the top indented pulley (5) first.

- Turn both indented pulleys in the formerly marked positions and

apply the indented belt on the indented pulley (4).

- Tension the belt and mount the dismantled components in the inverse

order.

3.11 V-belt, motor - head

3.11.1 Tensioning

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

The belt is correctly tensioned, when the opposite sides of the belt

approach one to another by up to 20 mm in applying the force of 10 N.

The belt is tensioned in turning respectively the motor in its holder.

3.11.2 Replacing the V-Belt

Caution! Danger of injury!

Switch off the main switch! before starting the setting

operation, wait until the motor stops!

- Loosen the screw (1) of the positioner arrest (2) and tilt the arrest.

- Unscrew the screws (3) of the handwheel.

- Unscrew the screws (4) of the belt guard and tilt the guard.

- Remove the belt guard of the motor and tilt the protections against

falling out the belt from the motor pulley.

- Replace the belt.

- Tension the belt (see par. 3.11.1).

3.12 Driving toothed belt

3.12.1 To exchange the driving toothed belt

Caution! Danger of injury!

Switch off the main switch! before starting the setting

operation, wait until the motor stops!

- Remove the machine head from the stand (uncouple the motor cables,

the machine head cable and screw off the wood screw and the screw

from the hinges).

- Remove the belt guard (1).

- Replace the belt (2).

432

10 N

l - 20mm

1 4

Page 49

3.13 Lubrication

3.13.1 Description

From the oil tank (1) there issue three suction wicks. The wick (2)

lubricates the pin of the thread mechanism, the wick (3) lubricates the

needle mechanism and the wick (4) lubricates the stitch length

mechanism. The superfluous oil from the needle and thread mechanisms

is sucked off by the wick (5) and lubricates the shifting wedge of the

feeding clutch.

The hook has its own oil reservoir (6). The driving gear of the hook is

lubricated from oil tank (7).

3.13.2 Refilling oil

For lubricating the machine oil Esso SP-NK 10, DA 10 is used or other

oil with the same quality. When putting the machine into operation,

each mechanism of the machine is to be lubricated with several drops

of oil. Oil is only refilled thereafter into the oil reservoirs using an oil

can into the holes in the oil level indicators.

The oil tanks (1, 2, 3) of the central distribution is to be filled

up to the mark max.

3.13.3 Multiple oil use

Oil which runs into the oil cup is collected in the collector (1) and may

be reused for refilling the oil reservoirs in the machine - see par.

3.13.2.

The oil collector (1) with the collected oil is uscrewed and the top part

of the oil can (2) which is added in the machine packing is screwed in.

Oil is then refilled into the reservoirs on the machine head and everything

is put into the original condition.

Page 50

4. Thread trimming

4.1 Description of the trimming mechanism

During the trimming cycle, the moving trimming knife (1), in an

opportune moment, hooks up the sewing threads and pulls them in the

sense of the arrow (A) against the fixed knife (2) until the threads are

trimmed. The spring (3) holds the hook thread after being trimmed off.

The moving knife (1) is mounted on the shaft (4) which turns by means

of the lever (5) under the effect of the fork (6) fixed on the shaft (7)

which is shifted by the electromagnet (8) from its starting position in

the sense of the arrow (B). When moving back in the sense of the arrow

(C), the shaft (7) is shifted by the cam (9) through the pickup roller

(10) into the starting position. The spring (11) maintains the mechanism

in its starting position. The electromagnet (12), in an opportune

moment, loosens the main tensioner. At the end of the trimming

cycle, both electromagnets (8 and 12) are switched off.

4.2 Setting the pickup roller

The holder of the pickup roller (1) is to be fixed in such a way that it is

positioned, in its starting position, between the shaft (2) and the shaft

(3), the respective gap A = 0.2 to O.4 mm.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- With the loosened screw (4), put the holder of the pickup roller (1)

up to the stop against the bracket (5) and, at the same time, t h e

shaft (2) up to the stop against the shaft (3).

- With the holder (1) held on the stop, shift the shaft (2) in such a way

that there appears the gap A = 0.2 to 0.4 mm, and tighten the

screw (4).

- Check the gap A in shifting the armature (6).

4.3 Setting the cam

The position of the cam (1) against the shaft (2) is to be such, so

that when the adjusting pin is in contact with the shaft (4), the

protractor scale of the handwheel (6) shows just the angle of 108

°.

If the pickup roller (5) is in its starting position of rest, the clerarance

between the roller (5) and the cam (1) should be as small as possible

but sufficient to prevent the cam from getting into accidental contact

with the roller.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Set the angle of 108

° on the handwheel (6) and lock it with the screw

(7) which is included in the accessory of the machine (tighten with

care).

- Shift the pickup roller (5) in the sense of the arrow up to the stop.

- Insert the adjusting pin (3), which is included in the accessory, into

the cam and turn the cam, until the pin (3) gets the contact with the

shaft (4).

- Insert a gauge having the thickness of 0.1 mm between the cam (1)

and the pickup roller (2) and shift the cam against the gauge up to

the stop. Tighten then the screw (8).

- Loosen the blocking of the handwheel, turn a bit the cam and tighten

the second fastening screw of the cam too.

11 10

65 97

108

382

Page 51

4.4 Setting the fork

In the starting position of rest of the trimming mechanism, when the

holder (1) is in contact with the bracket (2), the axis of the fork (3)

must intersect the axis of the shaft (4).

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Shift the shaft (5), until the holder (1) strikes the bracket (2).

- Loosen the screw (6).

- Shift the fork (3) in such a way that its axis intersects the axis of the

shaft (4).

- Tighten the screw (6).

4.5 Setting the moving knife

The moving trimming knife (1) is to be placed in its starting position

at rest with its end at the distance of the measure A= 0.1 to 0.5 mm

from the edge of the fixed trimming knife (2).

The height setting is to be such that its top surface is 1.8 mm below the

top surface of the throat plate.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screws (4 and 5).

- Turn the moving trimming knife (1) in the sense of the arrow and set

it in height. Tighten the screw (5).

- Turn the moving trimming knife (1) into its starting position in such

a way that the measureA = 0.1 to 0.5 mm is attained. Tighten the

screw (4).

4.6 Setting the height of the fixed knife and of the

retaining spring of the lower thread

The fixed knife (1) and the retaining spring (2) are fixed on the holder

(3). This holder is fixed with the screw (4) on the post of the hook (5).

In its height, the holder (3) is to be set in such a way, so that the top

surface of the fixed knife (1) is by 1.8 mm below the top surface of the

throat plate.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screw (4).

- In shifting the holder (3) in the hook post (5), set necessary position

of 1.8 mm.

- Tighten up the screw (4), check the correct setting.

4.7 Setting the fixed knife

The fixed trimming knife (1) is to be tensed up using the screw (2) in

such a way, so that it bears against the moving trimming knife in the 1/

2 of its length. The knives need not to trim untensioned threads.

Caution! Danger of injury!

Switch off the main switch. Before starting the setting

operation, wait until the motor stops!

- Set the angle of 300

° on the handwheel (4).

- Shift by hand the moving knife (3) into the marked position.

- Loosen the screw (2)ba hand, in shifting the fixed knife (1) set its

position, tighten then the screws (2).

- Check the bearing spot of the moving trimming knife (3) on the fixed

trimming knife (1) and give it a correction, if needed.

300

563

321

1/2

1,8 mmm

Page 52

4.8 Setting the retaining spring of the hook thread

The retaining spring (1) holds the hook thread after having performed

the trimming. It is to be set in such a way that the force necessary for

pulling out the thread from the retaining spring (1) is approximately

equal to the force necessary for pulling out the thread from the hook.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Shape the retaining spring (1) in such a way that it fits close with all

its surface (without wedge) onto the moving trim-ming knife (3).

- Shape the retaining spring in such a way that it fits close, with the

slightly tightened screw (2), onto the moving trimming knife without

any pressure.

- Tighten the screw (2), until the necessary force for pulling the thread

from the retaining spring is attained. The pulling force is tested

using a screwdriver (4) according to the illustration.

Caution!

The setting of the retaining spring (1) depends on the

setting of the hook thread tension and differs then

according to the respective sewing category.

The adjusting screw (2) should not be screwed in in such a way

that the retaining spring gets over the perimeter of the moving

trimming knife.

4.9 Setting the switching of electromagnets

The electromagnets of the trimming device and loosening of the

tensioner must work in accordance with the diagram. This is ensured

by setting the stopmotor (see the instructions for use of the stopmotor).

1- 1. position of the needle (135

° on the handwheel);

2- 2. position of the needle (64

° on the handwheel)

3- position of stopping the tensioner (10

° ÷ 25° on the hand-wheel)

4- movement of the pickup roller

of the trimmer cam

5 - current of the trimming device electromagnet

6 - current of the tensioner loosening electromagnet

132

213

Page 53

5. Material edge trimming

5.1 Description of the trimming mechanism

The trimming mechanism is a component part of the hook post. The

movement of the trimming knife (1) is adjustable within the extent of

1,2  4,3 mm. It is derived from the proper (motor) drive (2), from the

compensating clutch (3) by means of the eccentric (4) and the eccentric

shaft, the connecting rod (5) and the leverage (6) with the possibility

of an immediate switching-off by means of the switch off plate (7). This

movement is then transmitted by the vertical shaft onto the holder of

the trimming knife (8).

5.2 Dismantling and assembly of the motor

- trimming drive

The complete trimming drive is fastened on the bedplate of the machine

using three screws (1).

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

Dismantling

- Unscrew the screw (2).

- Loosen the screws of the adjusting ring and of the feeding clutch (not

illustrated), then the screws of the chain trans-mission (3) and shift

out the feeding shaft (4) in the arrow direction up to the necessary

distance.

- Disconnect the connector of the supply cable (5).

- Remove the trimming drive.

When remounting, proceed in a reverse sequence.

5.3 Setting of the trimming knife lifting

The standard size of the trimming knife lift is set up to about 2,5 mm

which suits the majority of the sewing operations. For trimming difficult

materials, this lift is to be increased to the maximum of 4.3 mm. When

sewing and trimming small inner curves, the lift is to be lowered to the

minimum of 1.2 mm.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screws (1) and set the white point on the eccentric flange

against the white adjustment mark of the drive holder (2).

- Hold the eccentric (1) in its set up position and, in turning the ring

(3) fastened on the eccentric shaft, set the necessary knife lift /to get

the standard lift of 2.5 mm, set the ring (3) at the half angle between

the adjustment marks MIN. and MAX./

- Tighten the screws of the eccentric (1).

5.4 Replacement and setting of the trimming knife

position

5.4.1 Replacement of the knife and setting

of the distance between the knife and

the throat plate insert

The distance between the knife and the throat plate insert is to be about

0,05 mm. the knife should not touch the insert when moving  it gets

heated and blunt.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the nut (1).

- Lift the holder (2) and remove the knife in the arrow direction.

- Mount the new knife, set the necessary distance and tighten the nut

(1).

5 263

231

178

Page 54

5.4.2 Setting of the knife position (turning) in

the sewing direction

When sewing models with big curves, the knife is to be set in such a

way, so that the trimming corner (B) in its front dead centre is at the

level of the needle when it enters into the throat plate (standard setting).

When sewing models with corners and narrow inner curves, the

trimming knife is to be set behind the needle in such a way, so that in

the moment when the needle leaves the throat plate and the trimming

corner of the knife (B) is in its front dead centre, there is a distance A

between the needle and the cutting corner of the knife , that is the width

of the trimmed edge.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

Standard setting

- Turn the shaft of the trimming drive using the ring (1), until the

trimming corner of the knife (B) gets the front dead centre.

- Turn the hand wheel until the needle enters the throat plate.

- Loosen the screws (2) and (3) and adjust the knife with the holder (4)

and the sleeve (5) as required.

- Tighten the screws (2) and (3).

Setting for models with inner curves

- Turn the shaft of the trimming drive by means of the ring (1) until the

trimming corner of the knife (B) gets into the front dead centre.

- Turn the hand wheel until the needle leaves the throat plate.

- Loosen the screws (2) and (3) and set the knife with the holder (4) an

the sleeve (5) as required.

- Tighten the screws (2) and (3).

Caution:

With any change of the knife position in the sewing direction, we

recommend to recheck the distance between the knife and the throat

plate insert, to correct eventually the distance in accordance with 5.4.1.

5.4.3 Height setting of the knife

The bottom side (surface) of the knife (1) is to be set above the sewn

material in such a way, so that it enables a tight passing above the

material.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen the screw (2).

- In turning the eccentric (3) set the height of the knife as required.

- Tighten the screw (2).

Page 55

5.5 Setting of engaging and disengaging of

the trimming mechanism, of the engaging

and carried lever stop

5.5.1 Description

The material trimming mechanism is formed by a moving part - lever

(1) on the shaft, which is connected by means of the lever (2) and the

connecting rod (3) with the trimming mechanism drive, and by a

carried part - lever (4), the component part of which is also the knife

holder (6) by means of the shaft (5).

The levers (1) and (4) are set up by means of mutually clamping joints

in such a way, so that the carried lever (4), when being turned by 90°,

fits into the moving lever (1) by means of the pawl (7).

When the trimming mechanism is engaged, the carrying part is connected

with the carried pawl (7) which controls at the same time the mechanism

of the trimming drive (8).

The trimming mechanism, which is situated on the vertical divided

shaft (5) is put into its working position by the hand lever (9) in turning

it to the right. After having switched on the trimmer, the torsion spring

(11) returns the hand lever (9) back into the position B and, after

having released the pawl (13) by means of the press button (14), into

the starting position A up to the stop (10).

Switching off of the trimmer will be done by pressing the switch off plate

(15) which, through the push-button (12), will release the pawl (7) from

the slot of the lever (1).

At the same time, the operating device of the microswitch is being

shifted and stops the running of the driving motor.

5.5.2 Setting of the engaging lever stop

The stop screw (1) is to be screwed in and locked by the nut (2)in such

a way, so that the engaging lever (3) is in its starting position

perpendicularly to the longitudinal axis of the machine.

5.5.3 Setting of the position (shifting)

of the carrying lever

When the carrying lever (1) is in the half of the lift of its reversing

motion, the pawl (2) is to be situated symmetrically to the axis of the

push button (3).

5.5.4 Setting of the carried lever stop

The stop screw (1) is to be screwed in and locked with the nut (2) in

such a way, so that, when being the trimming mechanism disengaged,

there is a clearance of 1 mm between the engaging lever pin (3) and the

pawl (4).

10 11

Page 56

5.5.5 Setting of the trimming mechanism

engagement

When engaging the trimming mechanism still before fitting the pawl

(1) into the slot in the lever (2) there is to be the clearance A = 0,01

up to 0,05 mm and the clearance B = 0,5 up to 0,6 mm.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen 2 screws (3) and 2 screws (4).

- In shifting vertically the microswitch (5), shift the cam (6) until

obtaining the clearance B and tighten then the screws (4).

- Shift the lever together with the pawl (1) under the push button (7) in

such a way, so that the pawl does not still fits into the slot.

- Set vertically the push button (7) on the clearance A and tighten the

screws (3).

- Loosen the screws (8) and, in shifting horizontally the holder (9), set

the microswitch (5) in such a way, so that the motor of the trimming

mechanism is switched off in the bottom position of the push button

(7) and switched on in its top position.

5.5.6 Setting of the torsional moment

of the return spring

The return spring (3) should have the least moment, but ¨this moment

should be sufficient for returning the trimming knife in its starting

position after having switched off the trimming. This means the spring

should individually be set up in accordance with the thickness and the

stiffness of the trimmed material.

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Loosen 2 screws (1) on the adjusting ring (2).

- In turning the ring (2) set at random the twisting moment of the

spring (3) and tighten both screws (1).

- Start sewing together with the edge trimming. Stop the machine in

the middle of the seam without removing the sewn material. Using

the push button (4), stop the trimming function and follow up, if the

spring (3) fulfils its required function. Correct eventually the setting.

5.6 Sharpening of the knives

For various types of trimmed material, the Company MAIER

manufactures knives with respective profiles in various qualities of

materials and dimensions.

(The usable knives are given in the Directions for Use together with the

respective supply numbers of the Maier and Minerva companies).

To obtain due quality of trimming, the knife should be ground in wet

condition on special grinding machines at short inter-vals (of about 2

to 5 hours) corresponding to the durability of the knife trimmer edge.

The special grinding machines are produced by the following

companies:

FORTUNA WIEN GmBH, A-1151 WIEN-Pelzgasse 13,

Postfach 91

MAIER UNITAS GmBH NÜRTINGER Strasse 19, D-7316, KÖNGEN,

Postfach 1130

5.7 Sewing without trimming

The technological utilization of this machine with vibrating bottom

horizontal trimming is not limited only for sewing operations with

simultaneous edge trimming. It can be also used for current operations

in the shoemaking and fancy goods indusries in accordance with the

selected sewing categories (accessories).

Page 57

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

The dismantling operation is to be done in the position  trimming

mechanism out of function.

- Remove the knife guard (1) and screw in anew its attachment screw.

- Loosen the screw (2) and remove the complete holder (3) together

with the trimming knife (4) from the shaft (5). The sleeve (6) is to

remain on the shaft  it serves for orienting the position of the knife

holder when remounting.

Caution :

Be sure in placing the dismantled component parts into the drawer

with regard to the protection of the trimming knife cutting edge and to

the possibility of injury.

6. Lifting the top roller by electromagnet

6.1 Description

The core of the electromagnet, respectively its pin must be set in such

a way that the presser foot lifting is enabled.

6.2 Setting the electromagnet pin

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Unscrew the cap of the core (1) of the electromagnet.

- Shift the core (2) with the pin (3) and unscrew the locking screw (4).

- Unscrew the pin (3) in the core (2) in the A direction up to the

stop.

- Push the core (2) into the magnet (5) in the B direction up to the

stop.

- In this position, set the maximum top roller lifting in the B direction.

- Screw on and tighten the arresting screw (4).

- Screw on the cap (1).

6.3 Setting the electromagnet current

The time response of the current of electromag. has 2 phases:

- initial switching on (0,2 ÷ 0,5 s) - the maximum force

- maintaining (when keying)

It is necessary to set max. 40 % of keying (see instructions

for use of the stopmotor). With a higher value thereof

and with a long period of the presser foot in its lifted

position there is a danger of electromagnet overheating.

6.4 Aseembly of the top roller lifting

electromagnet

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Remove the rear guard (3).

- Using the screws (1),fasten the electromagnet(2) on the rear guard(3)

with the given orientation of the outlet cable(4).

- Mount the rear guard (3).

- Connect the outlet cable (see par. 8).

- Set the pin of the electromaghet (see par. 6.2).

- Set the current of the electromagnet (see par. 6.3).

241

Page 58

7. Backtacking using electromagnet

7.1 Description

The position of the electromagnet with regard to the backtacking lever

must be set in such a way that it enables the maximum stitch length

when sewing in forward and in rearward sense. If this position is not

correct, the length of the stitch will be shortened in one or the other

feed direction.

7.2 Electromagnet height setting

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- Set the position of the electromagnet (2) in the upper position of the

grooves of the guard (3).

- Proceed to the mounting of the guard (3) with the magnet on the

machine head.

- Set the maximum stitch length and push the reverse stitching lever

into its bottom position (as with the reverse stitching operation).

- In this position, the bar (5) must be in contact with the roller (4) of

the lever (6). Otherwise shift the electric magnet (2) in the grooves of

the guard (3).

7.3 Setting the position of push-buttons

Caution! Danger of injury!

Switch off the main switch! Before starting the setting

operation, wait until the motor stops!

- By loosening the screws (1), it is possible to set the position of the

holder of the push-buttons (2) in the sense of sewing.

7.4 Change of the function of push-buttons

The Function of the push-buttons can be changed in accordance with

the possibilities given by the stopmotor (see instruction for use of

stopmotor).

8. Connecting the electric elements on the

machine head

The connection of the electric elements (electromagnets, backtacking,

presser foot lifting, thread trimming, loosening of the tensioner and

push-buttons) is made by means of a switchboard (1) fixed with its

supporting plate (2) on the rear side of the head by means of two

distance screws (3) (In the Fig., these electric elements are disconnected).

Connecting spots:

4 - backtacking electromagnet

5 - trimming electromagnet

6 - tensioner loosening electromagnet

7 - presser foot lifting electromagnet

8 - connector of push-button connecting

9 - connector of coupling the head with the stopmotor

10 - connecting cable of the head and stopmotor

Wiring diagram of connecting the electric elements of the machine

head.

9. Drive, control panel, position sensor

The detailed information concerning the drive, the control panel and

the setting of the position sensor is given in the manual of the drive and

of the control panel.

213

Page 59

10. Maintenance

Caution! Danger of injury!

The maintenance operations should be performed only with the machine switched off and with the motor stopped!

In the following table there are given the operations which should be performed and the respective time intervals between the individual operations.

Operation Time interval

Removal of the throat plate and its cleaning out.Cleaning out of the wheel feeder, hook and their

surrounding space. Removal of the residues of material and threads from the top roller. 1 day

Checking the oil level in oil reservoirs. 1 month

Checking the hook wear. Checking the function of the safety clutch against the hook overload. 6 months

Checking the V-belt and the indented belts. 1 year

11. Setting the machine according to the sewing category

11.1 Introduction

The sewing machine enables sewing within the extent from the light to medium heavy-duty sewing. The setting of the machine

must be adapted to the sewing parameters including also replacement of some components, such as e.g. needle, the throat plate

insert. For this reason, the setting of the machine is divided into 3 categories:

1 ... light sewing

2 ... medium sewing

3 ... medium heavy-duty sewing

In the factory, where this machine has been manufactured, the machine has been set with respect to the standard parameters of

the required sewing category which is designed by the number included in the commercial designation of the machine. If the user

desires changing the given setting to another sewing category, this operation should be performed by a specialized mechanician.

The standard parameters of sewing are described in the following paragraph. The actual parameters of sewing inside the given

sewing category may be different, which means that the machine operative must adapt respectively the setting of the machine,

e.g. the tension of the upper thread.

Page 60

11.2 Table of setting the machine according to the sewing category

Commercial designation of the machine 4181i - 1XX - X

1) The standard setting of the machine for the category 3 concerns a decorative stitching, when it is difficult to match a good

stitch interlocking with a faultless function of the thread trimming device. Otherwise, when sewing material of considerable

overall thickness, it will be necessary to increase the overtopping of the teeth above the needle plate and to increase also the

needle thread tension.

2) The thickness of a layer is measured using an engineer slide calliper with the pressure of jaws of about 10 N.

3) The values of tension are only orientative ones and it is necessary to adapt especially the tension of the hook thread

according to the stiffness of the material. An excessive tension of the threads when sewing soft materials causes material

wrinkling.

4) When changing markedly the sewing category together with changing the tension of the hook thread, it is necessary to

modify the tension of the retaining spring of the trimming device according to the paragraph 4.8.

5) When changing markedly the sewing category together with a marked change of the needle number, it is necessary to correct

the setting of the distance of the hook from the needle, according to the paragraph 3.1.3.

6) There are in use various types of feeders with the purpose of avoiding imprinting the teeth in the lining leather. Otherwise, it

is possible to use any feeder.

Setting as per chapter Instructions for service 3.5.3.1.2 3.3.2 3.5.3.2.2 3.6.6.1 3.6.6.2

Instructions manual 3.2 6.5 6.4 6.4

Instructions for assembling

2.4

4.5

Standard machine setting 1)

Needle Sewing Position Width Feeder Presser Presser Thread tension

size speed of feeding of needle - top roller top roller

lever pin plate pitch diameter position

insert of teeth

hole needle hook

thread thread

5) 6) 4)

0,01mm SPM mm mm m m mm N N

80 2500 1 1,2 0,4 35 10,5 3 1

100 2500 1 1,5 0,4 35 10,5 4,5 1,5

130 1600 1 2 0,6 35 10,5 5 - 8 2

Sewing

cate-

gory

-100

-200

-300

Standard sewing parameters

Thickness Number Stitch Label Distance

of one o f length number between

material material o f the

layer layers thread needle

P E S axis and

the work

mm mm mm

0,8 2 2 70 0,8

1 2 2,5 40 1,2

1,5 2 3 20 1,5