Duerkopp Adler 4181 - 1 Service Manual
Instructions for service
4181 - 1
Minerva Boskovice, a.s., Sokolská 60, CZ - 680 17 Boskovice
Tel.: +420-501-453434, 453433, 494111 Fax: +420-501-452165 http://www.minerva-boskovice.com
Edition: 04/2002 Printed in Czech Republic 735 342 000 428
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
3.3 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 Setting the needle (the needle bar holder) in the direction of sewing (fine setting)
3.3.4 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 mechanism of the main tensioner
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
Stitch length mechanism
3.5.2
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)
Setting the needle feed (rough)
3.5.3
3.5.4
Lower feed wheel
3.5.4.1 Feeding clutches
3.5.4.1.1 Description
3.5.4.1.2 Setting the lever of the second step of feeding(angle, position)
3.5.4.1.3 Setting of the lower eccentric
3.5.4.1.4 Setting the engagement and disengagement of the clutches
3.5.4.2 Wheel feeder and its post
3.5.4.2.1 Height setting of the feeder and tensioning of the chain
3.5.4.2.2 Replacement of the feeder
Setting the top roller (pressing force, height)
3.5.5
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 Setting the feeding difference
3.6.7 Replacement of the friction wheels of the drive conversion unit
Top roller
3.6.8
3.6.8.1 Selection of the top roller diameter
3.6.8.2 Forward, rearward and side setting
3.6.8.3 Setting the gear clearance and in the mounting of the top roller
3.6.8.4 Replacement of the top roller
3.7 Setting the presser foot lift ................................................................................................................................................ 19
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 ............................................................................................................................................... 2 1
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 ............................................................................................................................................................. 22
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 ............................................................................................................................................................................... 24
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 ................................................................................................................................................ 32
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 3
9. Drive, control panel, position sensor ....................................................................................................................................... 33
10. Lighting ............................................................................................................................................................................................ 33
10.1 Mounting on the machine head
10.2 Lamp replacement
11. Maintenance (table of operations) ............................................................................................................................................. 3 4
12. Setting the machine according to the sewing category .......................................................................................................... 34
12.1 Introduction
12.2 Table of setting the machine according to the sewing category
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.
1
13
15
3. Head of the sewing machine
7
8
10
5
11
2
3
4
6
1
3.1 Hook and the hook post
3.1.1 Description
9
12
16
14
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
main lubricating system and serves for lubricating the gear (3).
A
1
A
3
4
3.1.2 Height setting of the hook
The designated distance A should be 6.1 mm.
Caution! Danger of injury!
Switch off the main switch ! Before starting the
setting operation, wait until the motor stops!
- Remove the guard (1).
- Loosen both screws (2).
- By turning the screws (3 and 4), set the required distanceA.
After having set it, tighten carefully the screws.
- By axial shifting of the gear wheel (5), set the axial clearance
5
2
6
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
max. 0,1
2
7
1
5
11
5
9
10
6
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
3
category 3, the needle size 140 is set.
4
- 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.
Caution! Danger of injury!
Switch off the main switch ! Before starting the
setting operation, wait until the motor stops!
10
9
2
2
1
57
3
o
205
4
~ 0,5
6
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.
2
5
3
4
1
6
3
- 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.
4
Caution ! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
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.
1
A
2
5
o
295
- 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).
78 69
3
6
7
5
1
0,4
11
8
3
4
1
9
2
15
o
10
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).
1
2
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!
3
- Remove the throat plate and the trimming knife.
- Unscrew the screws (1) and remove the gib (2).
4
5
4
1
3
5
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 (3) 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!
~0,5
205
7
- 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-
6
8
o
9
10
9
10
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.
4
3.1.10 Dismantling of the hook post
3
2
9
1
5
6
7
11
5
6
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.
- Disconnect the hose with the wick.
- Screw out the screw (4) of the lever (8) on the shaft of the
trimming knife (9). Loosen the screw (10), turn the lever (8)
as indicated by the arrow, and take it out of the shaft.
- Loosen the screws (11) 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. Make sure that the
wicks in the tubes are in contact with the other wicks leading
oil into the box (7).
10
9
8
8
4
3
3.2 Needle and thread mechanism
7
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), by
means of which the thread mechanism is adjusted for a big or
a small hook. The needle bar holder (4) is mounted through
the pin (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
eccentric 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.
12
10
11
2
13
1
9
4
6
5
3.2.2 To check the handwheel angular adjustment
2
3
5
4
1
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 producers.
o
0
Caution ! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
6
5
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:
1
1
- 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 ! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
Caution !
An incorrect setting of the needle bar height may
cause the striking of the hook point against the
needle.
34
A
1
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 = 7.5 mm (distance of the front faces of the
arm and 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).
2
6
3.3 Throat plate and its post
3
2
6
5
4
5
6
1
3
2
1
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).
2
1
E
E
The directions E" between the needle and the edge of the
piercing hole must be the same both at the beginning and at
the end of the needle feeding.
- According to the table 11.2, limit for the respective sewing
- Set the maximum stitch length.
- Loosen the screw (1) of the eccentric of the needle bar
- By turning the eccentric (2), set the required distance E".
- Tighten up the screw (1) and check up the setting.
the direction of sewing (fine setting)
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
category the maximum stitch length (see 3.5.2.4).
holder.
Caution!
A faulty setting may cause bending or breaking of
needles against the throat plate insert.
3.3.4 Side setting of the throat plate post
3.3.3 Setting the needle (the needle bar holder) in
3
4
A
1
2
5
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.
7
3.4 Thread tensioners and limiter
45
2
3
7
6
11 8
21
10
9
13
12
3.4.1 Description
2
1
3
1
The main tensioner (1) serves for creating the tension of the
threads 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 foot lifting (3), on which
the lever (4), is mounted which shifts the prop (5), which
pushes the metal sheet lever (6). This lever shifts the pin (7)
and this pin pushes onto the washer (8) and relieves the spring
(9).
With the machines provided with a thread trimming device,
the main tensioner (1) is relieved as well when switching on
the electromagnet (10), when its armature (11) pushes against
the lever (6). The mechanism of the adapting spring (12)
maintains the thread in its tensioned state when passing
through the hook. 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.
3.4.2 Setting the tension of the main and auxiliary
tensioners
The tension of the main thread tensioner is regulated by means
of the nut (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 of sewing
and is indicated in the par. 12.2.
The tension of the auxiliary tensioner is regulated using the
P
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 mechanism of the
6
8
4
9
7
5
The nut (1) must be screwed off in such a way that the metal
sheet lever (2) bears on the plate (3) and, at the same time, the
lever (4) is not limited by the prop (5) in its rotation. The lever
(4) must be fixed against the shaft (6) in such a way that,
when the presser foot is in its lowest position, the nut (1)
bears on the metal sheet lever (2) with its minimum clearance.
1
2
6
3
- Unscrew thoroughly the nut (7) and loosen the screw (8).
- Put in one line the axis of the shaft (6), the axis (9) and the
8
4
7
1
2
- Unscrew the nut (1), until the metal sheet lever (2) strikes
- Screw in the nut (7) almost to the stop.
- Remove the sewn material and lower the presser foot.
- Turn the lever (4) in the sense of the arrow up to the stop.
- Return the lever (4) a bit back and tighten the screw (8).
main tensioner
Caution ! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
axis of the spherical surface of the nut (1).
against the plate (3). However, the lever (4) must rotate freely
in the sense of the arrows in both senses.
8
3.4.4 Setting the adapting spring
5
11
1
6
C
87
10
4
32
1
F
A
B
9
The mechanism of the adapting spring is to be set up in such
a way that, when uscrewing the nut (1) up to the stop to the
washer (2), the conical spring (3) remains under the tension
which is set by shifting the adjusting ring (4) locked by the
screw (1O). The angular setting thereof is to be done in such
a way that the angle A = 45°. The axial setting is to be done
in such a way that the plate (5) and the plate (6) are at the
mutual distance equal to the measure C= 3 mm. The washer
(7) is to be oriented in such a way that the distance B = 1 to
1.5 mm. The bushing (8) is to be oriented in such a way that
the adapting spring (9) is tensed up by 90° from the free state.
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Unscrew the nut (1) up to the stop towards the washer (2).
- Loosen the screw (10), push heavily the ring (4) against the
washer (2) and tighten the screw (10).
- Mount the mechanism of the adapting spring into the
machine in such a way, so that the pieces (5 and 6) are at
the distance C = 3 mm, set the angle A = 45° and tighten
the screw (11).
- Turn the washer with the nose (7) in such a way that the
distance B = 3 mm is attained.
- Put the screwdriver into the slit in the bushing (8) and turn
it in counterclockwise direction, until the spring (9) touches
slightly the nose of the washer (7). Turn then still the bushing
(8) by 1/4 revolution.
- Tighten the nut (1). In this way, the whole mechanism im-
mobilizes.
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 3/4 to 1 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
3
1
2
standard sewing conditions, the thread limiter is set in its
tested positions depending on the sewing category in
accordance with the chapter 12.
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) in such a way that the screw (3)
is situated above some letter according to the chapter 12.
- Tighten the screw (3).
3.4.6 Setting the additional thread limiter
The new version of the machine is equipped with an additional
thread limiter for improving the stitch uniformity. To set it,
proceed 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.
1
2
- 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.
9
Loading...