ORION
617-627-637-647-657
620-629-639-640-649
MAINTENENCE HANDBOOK
N 352
████ ████
From the library of: Superior Sewing Machine & Supply LLC
From the library of: Superior Sewing Machine & Supply LLC
WARNINGS
For general warnings on the subject of safety, see the INSTRUCTION BOOKLET. The installation and adjustment as well as maintenance operations shown in this booklet must only be carried out by specialist technical staff.
WARNING
BEFORE CARRYING OUT MAINTENANCE OPERATIONS, DISCONNECT THE EQUIPMENT AND MOTOR FROM THE MAIN ELECTRIC AND PNEUMATIC CIRCUITS, AND MAKE SURETUE MACHINE DOES NOT START WHEN THE PEDAL IS PUSHED.
BEFORE RECONNECTING TO THE MAIN ELECTRIC AND PNEUMATIC CIRCUITS, MAKE SURE ALL COVERS HAVE BEEN CLOSED AGAIN AND ALL PROTECTION WHICH MAY UAVE BEEN REMOVED HAS BEEN REPLACED.
NONCOMPLIANCE WITH THESE SAFETY RULES MAY PUT PEOPLE AT RISK.
CONDITIONS OF GUARANTEE
Rirnoldi |
Necchi guarantees that all Rimoldi Necchi machines (hereafter defined as "the |
products") will be |
free from defects in material or workmanship for one shift per day for twelve months |
from the date the |
invoice is issued to the end user (client). |
During the guarantee period, RIM, the AGENT or the RETAILER of the Rimoldi Necchi machine (hereafter defined as the "Seller"), will repair or replace any defective parts of the products covered by this guarantee and sold by them on behalf of Rimoldi Necchi free of charge. The repaired or replaced parts are only guaranteed for the remaining period of the product guarantee. Any maintenance operations and repairs carried out during the guarantee period do not modify the expiry date of the guarantee itself.
The guarantee operations are carried out on the client'spremises, or, if necessary, at the sellers. In this case, the client must assume all transport costs and risks. Any replaced parts removed from the product become property of Rimoldi Necchi.
Final decisions regarding the validity of the guarantee service requests and/or technical mett1ods involved are taken by the Rimoldi Necchi Quality Management.
This guarantee does not cover breakdowns due to normal wear, unauthorized operations or modification, improper or inexpert use of the product, lack of, incorrect or insufficient maintenance and/or lubrication, inadequate supply systems (electric and pneumatic), use of non-original spare parts and/or accessories and, finally, it does not cover damage to electronic parts caused by natural atmospheric events. Therefore, components which are worn due to normal use of the machine are not replaced under guarantee, such as needles, feed dogs, plates, presser foots, knives, loopers, etc
This guarantee only ensures the client for the repair and replacement of defective parts. All other claims and requests are excluded, including those related to loss of production or damage to things or people due to the use of a Rimoldi Necchi machine, even if due to the breakdown of the machine itself. Requests to replace the product itself are also excluded. This guarantee replaces any other guarantee or condition, either explicit or implicit, including therein any guarantee that the product is suitable for particular purposes.
This is the unique and complete agreement which regulates the relationship between ttle client, the seller, and Rimoldi Necchi, relating to the guarantee. No employee or organization of the seller is authorized to modify it on behalf of the seller or Rimoldi Necchi.
In the case of dispute regarding the contents, limits of application and anything else concerning the guarantee, the Italian version of these regulations will apply, since translations into other languages are only provided out of courtesy.
The competent law court is Milan, Italy.
Rimoldi Necchi S.r.l. reserves the right to modify or val}', for technical or commercial reasons, the information printed in this brochure.
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INDEX
1TECHNICAL FEATURES
2TYPE OF STITCHES
3MACHINE SPEED AND MOTOR PULLEY TABLE
4GENERAL INSTRUCTIONS
5INSTALLATION
5.1- ELECTRIC SYSTEM
5.2- LAMP CONNECTION
5.3-CONNECTION DIAGRAMS
6LUBRICATION
6.1- FILLING WITH OIL
6.2- DISPOSAL OF USED OIL
6.3- OIL CHANGE
7MAINTENANCE
8TRANSPORT
9REPLACING THE NEEDLE
10PRESSER FOOT PRESSURE
11FITTING AND ADJUSTING TRIMMING KNIVES
11.1- BOTTOM KNIFE
11.2- TOP KNIFE
11.3- SHARPENING THE KNIVES
12VARIATION OF BIGHT WIDTH
13ADJUSTING THREAD TENSION AND THREADING
13.1- ADJUSTING THREAD TENSIONS
13.2- THREADING
13.3- THREADING OF THE CHAIN STITCH THREAD TAKE UP (MACHINES CLASS 620, 629, 639, 640, 649)
14ADJUSTING FEED DOG HEIGHT
15ADJUSTING STITCH LENGTH
16ADJUSTING DIFFERENTIAL FEED RATIO
17NEEDLE GUARD ADJUSTMENTS FOR OVEREDGE STITCH
17.1- SINGLE NEEDLE MACHINES 617, 627, 637, 647 CHECK STANDARD SETTING
ADJUSTMENT OF FRONT NEEDLE GUARD ADJUSTMENT OF REAR NEEDLE GUARD
17.2- TWIN NEEDLE MACHINES CLASS 617,627, 637, 647, 657 CHECK STANDARD SETTING
FIXED REAR NEEDLE GUARD
17.3- MACHINES CLASS 620, 629, 639, 640, 649
CHECK STANDARD SETTING
18NEEDLE GUARD ADJUSTMENTS FOR THE CHAIN STITCH 18.1 -MACHINES CLASS 620, 629, 639, 640, 649
CHECK STANDARD SETTING
ADJUSTMENT OF FRONT NEEDLE GUARD (FOR ALL THE MACHINES) ADJUSTMENT OF REAR NEEDLE GUARD (ONLY FOR 639 AND 649 MACHINES)
19PULLER FEED (MACHINES CLASS 627 AND 629)
20ELASTIC METERING DEVICE WITH ELECTRONIC CONTROL
20.1-CONTROL BOX DESCRIPTION
20.2- PRESETTING OF THE ELASTIC FEEDING
20.3- EXAMPLES
21MACHINES WITH VARIABLE TOP FEED CLASS 640, 647 AND 649, 657
21.1- ADJUSTING THE TOP FEED
21.2- ADJUSTING THE HEIGHT OF THE TOP FEED DOG
21.3- ADJUSTING THE HEIGHT POSITION OF THE TOP FEED DOG
21.4- ADJUSTING THE TOP FEED DOG'SVERTICAL STROKE
21.5- POSITIONING THE TOP FEED DOG IN THE PRESSER FOOT SLOTS
21.6- LIMITING THE TOP FEED DOG'SLONGITUDINAL STROKE (FEED STROKE)
21.7- GATHERING PLATEN ADJUSTMENTHEADS TUYPE 647/649-22
21.8- PRESSER FOOT ADJUSTMENTHEADS 649-22....
22TROUBLE SHOOTING CHART
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1 • TECHNICAL FEATURES
617Ultra t1igh speed overlock machine equipped with a small arm instead of the standard work plate, which permits serging, welting operations, attaching of elastics,on tubular or already closed into a ring articles, even on those of little diameter.
620Ultra high speed double locked chain stitCh machine Type 401 for assembly seams, binding operations etc.
The machine is available in 1 needle and 2 needle models.
627Ultra high speed overlock machine for assembly seams, serging and welting operation of elastics, lace tapes, etc.
The machine is avaible in the following models:
1 needle for making type 503, two threads overedging stitch and type 504 3 threads overedging stitch.
2 needle for making type 509, three threads overedging stitch and type 512 and 514 four threads overedging stitches.
629Ultra high speed safety stitch machine for assembly seams,binding operations, zipper applications etc.
The machine is available in the following models:
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2 needle for making type 515, four threads safety stitch (2+2) and type 516fivethreads safety stitch |
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(2+3). |
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3 needle for making type 401, 504, 514, 516 and 401 +514 stitches. The different stitch |
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combinations can be obtained using only the necessary needles. |
637 |
Overlock machine, particularly suitable for sewing operations on heavy and very heavy weight |
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fabrics or for seams which require a wide overedge bight. Fitted with long needle bar stroke. |
639 |
Safety stitch machine, particularly suitable for sewing operations on heavy and very heavy weight |
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fabrics. Fitted with long needle bar stroke. |
640 |
Double chain stitch machine Type 401 fitted with variable top feed behind the needles. Highly |
|
recommended for a perfectly paired transportation of the upper and lower plies. |
647 |
Overlock machine fitted with variable top feed. Particularly suitable for sewing operations on |
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difficult to feed fabrics, for straight-hanging seams without ply shifting and for operations which |
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require gathering in one of the ply or in both top and bottom ply. |
649Safety stitch machine fitted with variable top feed. Particularly suitable for sewing operations on difficult to feed fabrics, for straight-hanging seams without ply shifting and for operations which require gathering in one of the ply or in both top and bottom ply.
657Overedge stitch type machine fitted with top feed, with removable small arm replacing the traditional work plate for assembling seams on tubular or closed into ring garments even of small diameter.
2 - TYPE OF STITCHES (FIG. 1)
All the Orion machines can be fitted, on request, with mechanic, pneumatic, eletric or electronic devices for mechanizing and automazing certain manual operations improving output and alleviating operator fatigue.
Ask the Rimoldi Necchi Service personnel for more detailed information about machine uses and special devices applications, or request the descriptive leaflets from Rimoldi Necchi S.r.l.
3 - MACHINE SPEED AND MOTOR PULLEY TABLE (Fig.2)
The part symbol and the size of outside diameter (D) are printed on each pulley (fig. 3).
WARNING
Run the machine at reduced speed for the first three months of use. It is suggestes to use the machine at a speed of 500/600 revolutions per minute lower than the maximum speed indicated on the technical documentation furnished with the machine.
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To obtain the maximum machine performance, the speed must always correspond to the operator'sskill level and to the difficulty of the sewing operation.
Rimoldi Necchi S.r.l. does not guarantee the machine if the same is used at a speed higher than the maximum indicated or if the machine is employed for operations different than those described in the technical documentation.
4 - GENERAL INSTRUCTIONS
Before connecting the motor to the electric network:
-Check that the connection of the terminal board inside the motor is suited to the rated voltage
-Check that the overload cut-out switch is calibrated to the same voltage as above and to the power of the installed motor
-Check that the earthing connections are all efficient
If, after connecting the motor to the electric line, the direction of rotation of the machine is opposite to the one prescribed, the direction of rotation of the motor can be reversed just transposing between them any of the three polarities in the connecting plug, without touching the yellow-green earthing cable.
5 - INSTALLATION
5.1 - ELECTRIC SYSTEM
The electric system includes the motor cutout switch (fig. 4), the motor connecting cable and a cable without plug. The allowed connections to the electric grid are those laid down by the laws in force.
The power cable (the blue one only) is considered to be double insulated, and therefore can be used for overhead connections by fixing it to a suitable vertical column (e.g. the bobbin holder).
N.B.- The cable must not be threaded through the bobbin holder tube or any other tubes which could cause abrasions and cuts in the wire protecting sheath, which may lead to the risk of hidden contacts.
With every type of connection, it is necessary to connectthe electric system to an officially acknowledged earth using the yellow-green conductor (fig. 5).
5.2 - LAMP CONNECTION
For a self-contained light input, the RIMOLDI 019-90 is to be used. It is to be connected to the input terminals of the overload cut-out switch.
Input E = 125/160/220/240/380/415 V. 50/60 Hz Adjustable output U =from 5 to 12 V. 20 VA
5.3- CONNECTION DIAGRAMS FOR SEWING UNITS FITTED WITH SINGLE-PHASE DEVICES (for example: SARA, RITA, SONIA, etc.)
The connections of the devices which make up the Rimoldi Necchi sewing units or sewing systems must comply with the diagrams in figures 6 and 7 set out for the cases of five-wire (distributed neutral) 380 V three-phase and four-wire 380 V (NON-distributed neutral) electric lines respectively.
In the case of connection to lines with NON-distributed neutral (fig. 7), it is necessary to place an approved single-phase transformer for input voltages of 380-415V and output voltages of 220-240V 200VA between the motor cut-out and single-phase devices, or request Rimoldi transformer n. P91 0054-0.
Always, either check the setting of the motor cutout switch or have it checked by competent staff. The value of the motor cutout switch setting (in amperes) must be equal to the value shown on the table attached to the switch box itself, according to the voltage and power of the motor used. In order to check and adjust the setting, remove the switch cover, and turn the special screw (or move the cursor index) until the index points to the required value.
Warning: disconnect from the mains before removing the cover.
Rimoldi heads can be fitted to common stands in the majority of cases, provided the stands have the following characteristics: ·
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-40 mm thick plywood wooden table.
-adjustable feet to ensure stability.
-ability to support a weight of at least 200 kg. stably (head + motor, and any other devices).
-for Gemini and feed-off-the~arm heads, it is advisable to use original Rimoldi stands.
-It can be installed in two ways on the table:
-normal: work surface raised above the table (Fig. 8 - 8a8b).
-submerged: work surface on exactly the same level as the table (Fig. 9 - 9a9b).
N.B. If it is wished to install the machine on a stand which the client already has, it is necessary to carry out the following operations:
- cut the table, or modify the cut if the stand already has a table, bearing in mind that:
-normal positioning - Encl. B
-submerged positioning - Encl. C
-replace the machine holding plate fixed to the table with the one supplied with the new head.
A)NORMAL POSITIONING (Fig. 8 - 8a8b)
a)Level stand
b)Fit the machine holding plate by proceeding as follows:
- place the 2 long bolts E and 2 short bolts E1 into the four 10 mm. diam. holes in the tables (fig. 8a)
c)Place rubber bushes G and spacers H into the 2 holes (one back and one front) on the right of machine holding plate F Fig. 8a). This should be done by obseNing the plate placed on the stand from the operator'spoint of view.
d)Connect the 2 crosspieces F1 to plate F with two bolts P (which should be fitted into the holes in the left of plate F), two washers Q and two nuts M (do not screw nuts M rigt1t down - Fig. 8a)
e)Place rubber bushes G abd spacers H in the remaining holes in crosspieces F1
f)Place washers I onto rubber bushes G
g)Slip two spacers R1 and two washers S onto short bolts E1 (Fig. 8a)
h)Positioning machine holding plate F, prepared as above, by fitting it onto the 4 bolts E and E1 using rubber bushes G (Fig.8a)
i) Slit the four washers L which should rest on rubber bush G onto the four nuts E and E1 (Fig. 8a)
I)Slip on 2 long bolts E 2 washers Land 2 spacers R (Fig. 8a)
m)After fitting washers L onto nuts E and E1, tighten nuts M completely (Fig. 8a)
n)Fit the 4 support C with respective nuts D onto the machine holding plate F (without locking them) and the washers (Fig. 8 and 8b)
o)Insert the 4 rubber pads A on the 4 pins C (Fig. 8 and 8b)
p)Take hold of the head as shown in enclosures A and A 1 and place it on the 4 rubber pads A (Fig. 8)
q)By adjusting support pins C, set the height of the head, making sure that it protrudes from the plane of the table Level the head by adjusting pins C
N.B. This operation is always carried out with the trapezoidal drive belt detached.
r)Connect the drive belt (1 Ox6 mm. cross section) to the motor and head pulleys (handwheel). Only use the motor pulley supplied with the head. In any case, never exceed the maximum speed shown in the characteristcs of the head. Check that the drive belt is on a plane at right angles to the pulley axes (vertical plane).
Adjust the belt tension: the tension is correct when a camber of about 10-15 mm. is created by placing a load of about 1-2 kg. in the position shown in the figure 10.
s)Connect tie-rod B to the machine presser foot lift lever N of the holding plate F and stand pedal (Fig. 8b).
B)SUBMERGED POSITIONING (Fig.9- 9a -9b)
a)Level stand
b)Fit the machine holding plate by proceeding as follows:
- place the 2 long bolts E and 2 short bolts E1 into the four 10 mm. diam. holes in the tables (Fig. 9a)
c)Place rubber bushes G and spacers H into the 2 holes (one back and one fropnt) on the right of machine holding plate F (fig. 9a). This should be done by observing the plate placed on the stand from the operator'spoint of view.
d)Connect the 2 crosspieces F1 (upside down compared to the normal positioning - Fig. 8a) to plate F with two bolts P (which shold be fitted into the holes in the left of plate F) two washers Q and two nuts M, which should not be screwed right down (Fig. 9a)
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N.B.The bolt P, respect to fig. 9b, will be assembled on its own head under the plate F.
e)Place rubber bushes G and spacers H in the remaining holes in crosspieces F1
f)Slip whashers I onto bolts E and E1 (Fig. 9a)
g)Slip spacer R onto bolts E, and spacer R1 onto bolts E1. Place four washer I onto rubber bushes G (Fig. 9a)
h)Positioning machine holding plate F, prepared as above, by fitting it into the 4 bolts E and E1 using rubber bushes G (Fig.9a)
) Slip the four washers L, which should rest on rubber bushes G, onto the four bolts E and E1 (Fig.9a)
I)Tighten nuts M on the 4 bolts E and E1 and lock them down. At this point, lock down the two nuts M on the bolts P (Fig.9a)
m)Fit the 4 support C with respective nuts D onto the machine holding plate F (without locking them) and the washers (Fig. 9 and 9b)
n)Insert the 4 rubber pads A on the 4 pins C (Fig. 9 and 9b)
o)Take l1old of the head as shown in enclosures A and A1 and place it on the 4 rubber pads A (Fig. 9)
p)By adjusting support pins C, set the height of the head so that work surface T (Fig. 9) is aligned with tha table. Level the head by adjusting pind C
N.B. This operation is always carried out with the trapezoidal drive belt detached
q)Connect the drive belt (1 Ox6 mm. cross section) to the motor and head pulleys (handwheel). Only use the motor pulley supplied with the head. In any case, never exceed the maximum speed shown in the characteristcs of the head. Check that the drive belt is on a plane at right angles to the pulley axes (vertical plane). Adjust the belt tension: the tension is correct when a camber of about 10-15 mm. is created by placing a load of about 1-2 kg. in the position shown in the figure 10.
r)Connect tie-rod B to the machine presser foot lift lever N of the jolding plate F and stand pedal (Fig. 9b).
N.B. Incorrect installation of the machine on the stand can lead to more noise and vibrations than stated by the manufacturer.
In particular, noise and vibrations can increase when:
-Non-original rubber pads are used.
-Non-original spare parts are used.
-The belt is not adjusted correctly (too slack).
-Non-original or unsuitable supports are used.
-Bobbin holders which are nbt firmly fixed to the support are used.
-Guards and work surface have been tampered with or not fixed correctly.
NOTE: the packing material should be disposed of properly.
6 - LUBRIFICATION
6.1 - FILLING WITH OIL
Warning: the machine is supplied without lubricant, therefore, before starting the machine, it is necessary to fill it using the special oil for industrial sewing machinesRIM 32M - provided with the machine itself.
In order to fill it or later top it up, proceed as follows:
-Unscrew transparent cap A (Fig. 11 ).
-Pour in the contents of the RIM 32M oil tin supplied with the machine.
-Check the amount poured in through sight glass D (Fig. 11 ). The oil level must never exceed the upper line (MAX) or fall below the lower one (MIN).
-Screw cap A back on.
WARNING: always use RIM 32M both when the oil is changed and when it is topped up. It is not advisable to mix oils of different types. The use of lubricating oils of a different type to the oil recommended or the addition of additives can lead to irreparable machine damage and the forfeiture of the guarantee.
Only in special situations, it is possible to use one of the following types of oil as an alternative to the RIM 32M oil recommended by the manufacturer:
-AGIP OTE 32
-MOBIL DTE LIGHT
-TEXACO REGAL OIL 32
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6.2 - DISPOSAL OF USED OIL
Incorrect disposal of used oil causes serious pollution problems for man, animals, and the environment. It is therefore necessary to dispose of the oil by carefully following the instructions below:
1)RIM 32M lubrication oil is totally mineral, therefore after use it is categorized among the 'TlECLAIMABLE USED MINERAL OILS"
2)The used oil must be collected in a suitable container used exclusively for this purpose.
3)The oil should be delivered to a legally authorized body.
6.3- OIL CHANGE (Fig.12)
To empty the oil out of the sump, unscrew the drain plug A on the lower part of the sump.
Dismount the sump from the base of the machine unscrewing the 5 screw that fix it and change or clean with gasoline or petroleum the filters C, D, E and F.
Blow the filters with low pressure air before remounting.
Check the drain plug gasket and replace with a new one, if it is damaged. Remount the drain plug with gasket on the sump.
7 - MAINTENANCE
WARNING
BEFORE CARRYING OUT MAINTENANCE OPERATIONS, DISCONNECT THE EQUIPMENT AND MOTOR FROM THE MAIN ELECTRIC AND PNEUMATIC CIRCUITS, AND MAKE SIJRE 'THE MACHINE DOES NOT START WHEN THE PEDAL IS PUSHED.
BEFORE RECONNECTING TO THE MAIN ELECTRIC AND PNEUMATIC CIRCUITS, MAKE SUBE ALL COVERS HAVE BEEN CLOSED AGAIN AND ALL PROTECTION WHICtl MAY .iAVE BEEN REMOVED HAS BEEN REPLACED.
NONCOMPLIANCE WITH THESE SAFETY RULES MAY PUT PEOPLE AT RISK.
The periodic maintenance operations to be carried out in order to keep the machine constantly in perfect working order are:
Every day.
Clean all the moving machine parts related to feed and stitch formation with a brush. Check the needle point and needles.
Check the oil level and, if necessary, top up before starting the daily activity.
To clean the machines sewing area, remove the work plate.
For the 627, 637 and 647 class machines this is done by inserting the tweezers A or a screwdriver under the workplate 8 as shown in figure 13 and then lifiting the tweezers as ~3hown in figure 13 until the work plate is separated from the magnet.
For machines class 620, 629, 639, 640 and 649, the work plate is removed by opening the front cover N (Fig.14), and lifting it until it is separated from the magnet.
If the machine is equipped with 135 or 235 chain cutting device, in order to remove the work plate it is necessary to slide it toward the rear part. of the machine.
Every Week.
-Remove the needle plate and clean the feed dogs and looper with a brush.
Each month.
-Check the wear of the belt.
-Check the wear of the needle guard.
Every three months
If the machine is equipped with subsidiary filter, unscrew the transparent cap A (Fig.11) and remove the filter. Clean it with gasoline or petroleum and blow it with low pressure air before remounting.
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Every six months
- Replace the oil and clean the filter (see II Every three months'')N..B. -If RIM 32M oil is not used, replace it every three months.
IMPORTANT If the machine is emploied for sewing fabrics which produces a lot of dust, the change of oil and of filters must be more frequent.
Every two years
Replace the oil filters of the sump when using oil RIM 32M.
For this operation, dismount the sump from the base of the machine unscrewing the 5 screw that fix it. Unscrew the screw B, remove the filters C, D, E and F and replace with new ones (fig.12).
When using a type of oil different than RIM32M, it is necessary to replace oil every year.
After a long period without use
If the machine is not used for a long time, it is necessary to cover it with the cover provided.
Before starting to use it again, carry out the following operations:
-Check the oil level and, if necessary, top it up.
-Check that all the accident-prevention guards are in place and perfectly operative.
-Connect the machine to the main electric and pneumatic circuits.
-Oil the needle bar with RIM 32M oil.
-Run the machine at low speed ~3000 rpm for about 10 seconds and check that oil flows under the transparent filling cap.
8 |
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TRANSPORT |
The machine weighs is 36 Kg. |
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TAKE HOLD OF THE HEAD AS SHOWN IN ENCLOSURES A and A1 (INSTALLATION) |
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9 |
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REPLACING THE NEEDLE (FIG. 11) |
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The needle is inserted into the hole of the needle clamp and is fixed by the allen screw F (Fig. 9). |
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To replace the needle, switch off the motor and make sure that the machine has stopped completely |
1 |
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·by pressing the pedal:
1)Turn the handwheel manually to raise the needle to its top position.
2)Lower lever Land turn the presser foot towards the left side of the machine.
3)Slaken needle-locking screw F, remove the needle and replace it with a new one, which must be of the same system as indicated in the label of the machine.
Take into consideration that the looper passage groove must be turned towards the rear part of the machine.
4)Tighten screw F without forcing it, taking care not to alter the needle orientation.
5)Bring the presser foot back to its normal working position.
After replacing the needle, remember to position the finger protection plate correctly namely in a position so that the finger tips cannot reach the needle points neither upward nor downward.
10 - PRESSER FOOT PRESSURE (FIG. 11)
To adjust the pressure of the presser foot, loosen screw I and turn the knob M: turn the knob in clockwise direction to increase the pressure and in counterclockwise direction to decrease it.
ATTENTION: THE NEW 11 LOW INERTIA11 PRESSER FOOT REQUIRES A VERY LIGHT PRESSURE ACTION IN ORDER TO FEED THE FABRICS PROPERLY.
11 - FITTING AND ADJUSTING TRIMMING KNIVES
11.1- Bottom knife
To fit and adjust the bottom knife proceed as follows:
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1)insert knife in the seat on knife holder D (Fig.15), taking care that the cutting edge does not project above the work plate, then tighten screw A
2)make sure that the knife holder D moves freely in its seat and then position it to suit the bight width required
3)lightly tighten screw B
4)position the top knife touching the bottom one and slacken screw B so that spring C creates the right pressure between the two knives
5)tighten screw B.
11.2 - Top knife
The machine can be equipped with one of the top knife assemblies represented in Fig.16a and 16b. To fit the top knife (fig. 16a) proceed as follows :
1)position the knife in the seat on knife holder E and lock with screw F
2)turn the handwheel till the top knife assembly reaches its bottom dead point and check that the cutting edge is 0,8 mm below the cutting edge of the bottom knife.
If the knives are not in the exact position, loosen screw F and move the top knife assembly towards right to lower the top knife edge or towards left to raise the top knife edge.
Slide the top knife in its oblique seat to maintain the correct contact between the two knives.
To fit the top knife (fig. 16b) proceed as follows :
1)position the knife on knife holder E and lock with screw F
2)turn the handwheel till the top knife assembly reaches its bottom dead point and check that the cutting edge is 0,8 mm below the cutting edge of the bottom knife.
If the knives are not in the exact position, loosen screw F and move the top knife up or down.
To maintain the correct contact between the two knives loosen screw G and properly move the knife assembly.
11.3 - Sharpening the knives
The knives should be sharpened periodically using the Rimoldi Necchi RASA S001-02 (50/60Hz 220V) and Rimoldi Necchi RASA S002-02 (50/60Hz 11 OV) and the special block 990322-0-10 (supplied on request) which ensures the correct sharpening angle.
12 - VARIATION OF BIGHT WIDTH
The needle bight width A (fig. 17) is measured between the needle and the right edge of the needle plate finger.
The bight width can be varied slightly by adjusting the position of the trimming knives. For varying it beyond certain limits the needle plate must be changed.
See needle plate on request on Technical Documentation.
13- ADJUSTING THREAD TENSION AND THREADING
13.1- Adjusting thread tensions (fig. 11)
The treads coming from thread guide bracket B are pressed between two tension discs.
Therefore to obtain the correct stitch formation the pressure of the spring must be adjusted by turning tension knob C.
Be careful not to screw it down too tightly as this could cause thread breakage.
13.2 a Threading
For the correct threading of the machine, see the threading chart or the threading sketch glued inside the loopers cover.
The various ways of threading the 11 tension platesII to suit the kind of thread used are illustrated in Fig.18. A- cotton threads
B- woolen, helanca, dralon threads and all soft threads generally C- very twisted threads
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13.3 - Threading of the chain stitch thread take up (machines class 620, 629, 639, 640 and 649)
For threading the chain stitch thread take up operate as follows:
1)Open the front cover N (Fig.14) and pull out the sliding thread guide (fig.19)
2)Thread the chainstitch looper thread through the small tube B with its threading wire (to be threaded from the front of the machine)
3)Take the thread which has come out of tube B, threading it in sequence:
from hole on thread guide C to holes on thread guidesD and E through slit F, then thread guide G and continue to thread the chainstitch looper.
When the threading is finished, push back the sliding thread guide A and mount the work plate.
When pushing back the sliding thread guide, make sure that the portion of the thread in tension between holes D and E is securely inserted in the cut out between the thread guides H and K.
Also make sure that the high point on the lower take-up cam L begins to take-up thread from the looper at the same time as the needle reaches top dead point.
14 - ADJUSTING FEED DOG HEIGHT
With the feed dogs in their highest position, the distance they project from the needle plate must be equal to the value indicated in the Technical Documentation.
To obtain this setting loosen the fixing screw A for main feed dog and B for differential feed dog (Fig.20) and move the feed dog up or down.
If the machine is equipped with chain feed dog with one row of teeth (Fig.21 a), this must not project from the needle plate surface when the feed dogs are in their highest position.
If the machine is equipped with chain feed dog with two rows ofteeth (Fig.21 b), this must be 0,2 mm lower than the feed dogs.
15 - ADJUSTING STITCH LENGTH (*)
To adjust the stitch length proceed as follows (fig.11 ):
1)turn the handwheel and press the push button E until it is completely inserted in the notch of stitch adjustment eccentric.
ATTENTION: For machines class 620, 629, 639, 640 and 649 open the front cover N (fig.14) in order to push the pushbutton E.
2)turn the handwheel:
-in clockwise direction (as shown by the arrow in the drawing) to lenghthen the stitch.
-in counter clockwise direction to shorten the stitch.
3)release the push button E.
Make some sewing tests to verify if the stitch length is the desired one.
16 - ADJUSTING DIFFERENTIAL FEED RATIO(*)
The differential feed ratio is the ratio between differential feed dog stroke and main feed dog stroke. When the differential feed dog stroke is greater than main feed dog stroke, the fabric will be gathered during sewing (positive differential feed).
This differential feed ratio is particulary suitable for obtaining perfectly straight-hanging seams on weft knit and elastic fabrics and for gathered seams in general.
When the differential feed dog stroke is less than main feed dog stroke, the fabric will be stretched during sewing (negative differential feed).
This differential feed ratio is particularly suitable for seaming woven and warpknit fabrics. To adjust the differential feed ratio proceed as follows (fig. 11 ):
1)loosen button G and slide it up for gathering the fabric (positive differential feed)
2)slide button G down for stretching the fabric (negative differential feed).
The stop H is preset at the factory according to the application characteristics of the machine and its position must not be modified.
(*) The maximum stitch length and the minimun and maximum differential feed ratio, indicated for each subclass in the Technical Documentation, refer to the standard sampling of the machine and can be obtained as indicated ·inchapter 15 and 16. Different values can be obtained by the proper adjustment of mechanical part inside the machine.
From the library of: Superior Sewing Machine & Supply LLC
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