Page 1
884
Service Instructions
Page 2
All r
ights reserved.
Property of Dürkopp Adler AG and copyrighted. Reproduction or publication of the content in any manner, even
in extracts, without prior written permission of Dürkopp Adler AG, is prohibited.
Copyright ©
Dürkopp Adler AG - 2014
Page 3
Introduction
This service booklet contains the instructions for setting the sewing machine
head mechanisms.
The directions for putting the machine into operation and for setting the
positioning drive are contained in another publication.
The service booklet is common for all subclasses of the machine and
contains also the instructions for setting optional accessories of the machine,
if this is necessary owing to their complexity. Provided the machine supplied
does not contain some elements, then the respective chapters may be
ignored.
The succession of the setting operations is expressed here by sequencing
the paragraphs of this booklet. When setting, check up, if the setting
operations related to this setting have already been performed.
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 in full knowledge of the
2. Before putting into service also read the safety rules and
3. The machine must be used only for the purpose intended. Use of
4. When gauge parts are exchanged (e.g. needle, presser foot, needle
5. Daily servicing work must be carried out only by appropriately
instruction book and operated by persons with appropriate training.
instructions of the motor supplier.
the machine without the safety devices is not permitted. Observe all
the relevant safety regulations.
plate, feed dog and bobbin) when threading, 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.
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, disconnect the
machine from the compressed air supply system (max. 7-10 bar).
Before disconnecting, reduce the pressure of the maintenance unit.
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.
13. The line cord should be equipped with a country-specific mains
plug. This work must be carried out by appropriately trained
technicians (see paragraph 8).
It is absolutely necessary to respect the safety
instructions marked by these signs.
Danger of bodily injuries !
Please note also the general safety instructions.
Page 5
Index Page
Service Instructions for the Class 884
(Edition 07.2014)
1 General
1.1 Setting gauges ................................................ 5
1.2 Adjusting the handwheel .......................................... 6
1.2.1 Sewingmachinewithminimotor...................................... 6
1.2.2 Sewingmachinewithdirectdrive..................................... 7
2 Bottom feed
2.1 Basic setting for stitch adjustment and stitch length limit ....................... 8
2.2 Stitchuniformityforforwardsandreversestitching.......................... 9
2.3 Adjustingoffeedshaftpositionandclutchleverposition ...................... 10
2.4 Position of the eccentric tappet for the feed movement ........................ 11
2.5 Switchingoverthefeedclutch ...................................... 12
2.6 Position of the eccentric tappet for the switch over of the feed clutch ............... 13
2.7 Checkingtheswitchoverofthefeedclutch .............................. 14
2.8 Wheel feed .................................................. 15
EN
3 Top feed
3.1 Position of the needle holder with single needle sewing machines ................. 17
3.2 Needle feed .................................................. 18
3.3 Rollerfoot................................................... 20
3.4 Rollerfootlifting............................................... 21
3.5 Variatoroftherollerfootdrive....................................... 22
4 Adjusting the needle bar and the hook
4.1 Hookheight.................................................. 23
4.2 Needle bar height, play of needle to hook tip, loop stroke ...................... 24
4.3 Hook tip guard ................................................ 25
4.4 Bobbin housing release ........................................... 26
4.2 Hooklubrication............................................... 27
5 Thread setting
5.1 Thread regulator, check spring, bolt for the thread lever mechanism ................ 28
5.2 Bobbin winder................................................. 29
6 Thread cutter
6.1 Thread-pulling knife height ......................................... 30
6.2 Starting position for the thread pulling knife ............................... 31
6.3 Angleposition(timing)ofcontrolcamandclearancebetweencamandroller.......... 33
6.4 Bobbin thread clamp ............................................. 34
Page 6
Index Page
7 Electronic control and sewing machine drive - positioning motor ............... 35
7.1 Terminals to PCB connections - electromagnetic variant ....................... 36
7.2 Terminals to PCB connections - pneumatic variant .......................... 37
Page 7
1 General
These service instructions describe the adjustments that can be made
to the class 884 special sewing machine.
CAUTION!
The operations described in these service instructions may only be
carried out by qualified staff or other appropriately trained persons!
Caution: Risk of injury!
Turn the main switch off for repair, conversion and maintenance work
and separate the machine from the pneumatic supply line.
Any adjustment work and functional testing with the machine running
should be conducted only under observance of all safety measures
and with the greatest possible caution.
EN
These service instructions describe the adjustment of the sewing
machine in a logical order. Please observe that various setting
positions are dependent on each other. Thus it is essential that the
settings be conducted while keeping to the order described.
1.1 Setting gauges
For all adjustments of parts involved in the stitch formation, a new
undamaged needle must be inserted.
This text does not specifically mention any machine covers or panels
which must be removed or re-mounted in order to conduct inspections
or adjustments.
Note
Some shafts on the special 884 machine are provided with flat
eccentric surfaces. This significantly simplifies machine adjustments.
For all adjustments on flat surfaces, the first screw screwed in the
direction of the eccentric surface.
The retention pin required for adjusting the machine in included with all
units. It is located with the machine accessories and can be attached
so that it is easily accessible below the oil tray.
5
Page 8
1.2 Adjusting the handwheel
Rule:
The handwheel (4) is labelled with degree numbers.
Certain adjustments are made with these marked handwheel positions.
–
Turn the handwheel until the degree value specified in the
instructions is aligned with the pointer (3).
–
Proceed with the adjustment described.
When the needle bar is at top dead centre, the pointer (3) should be
aligned with “0” degrees.
1.2.1 Sewing machines with minimotor
1
4
3
2
–
Loosen the handwheel screws witha3mmAllenkey(1).
–
Position the needle bar in the upper dead centre position. Use the
retention pin (3 mm diameter) to peg the position (2).
–
Turn the handwheel so that the pointer (3) points to 0 degrees on
the rotary scale.
–
Tighten the first screw with the Allen key (1). Turn the handwheel
to 50° and tighten the second screw with the Allen key (1).
6
Page 9
1.2.2 Sewing machine with direct drive
1
5
EN
36
–
Unscrew three fixing screws on the hand wheel (5) and remove it.
–
Put the needle in the upper dead point and insert the setting pin
(2), which is a part of the sewing machine accessories and which is
fixed on the oil tray bottom s ide, into the crank head.
–
Loosen two setting screws of the hand wheel flange (4) with the
Allenkey3mm(1).
–
Turn the hand wheel flange with the hollow (6) against the sign (3).
–
Tighten both setting screws with the key (1) and fix the hand wheel
on again.
24
7
Page 10
2 Bottom feed
2.1 Basic setting for stitch adjustment and stitch length limit
Rule:
1. When setting the s titch length at “0”, the stitch regulator gear should
have as little play (clearance) as possible when you press down on
the bartacking lever.
2. The maximum stitch length limit depends on the material to be sewn
and the sewing equipment being used (see operating instructions).
53 6 4
–
Loosen screw (1) and take off the settings dial (2).
–
Turn the screw (3) as far as needed to the right using a 10 mm
open-ended wrench. Verify that the stitch regulator gear is without
motion by pressing down on the bartacking lever. This fulfils rule 1.
–
Set the scaling ring (4) with stitch length “0”toalignwiththe
circular mark (5).
–
Limit the stitch length according to rule 2. For this, screw the
retention pin (6) into the proper hole. The holes are marked with
numbers which indicate the maximum stitch length.
–
Put the settings dial (2) back on and tighten the screw (1).
12
Caution: Risk of injury!
Turnthemainswitchoff.
Only carry out this basic stitch adjustment when the machine
is turned off.
8
Page 11
2.2 Stitch uniformity for forwards and reverse stitching
Rule:
1. When making a rough-scale adjustment to the stitch regulator gear,
the machine should not feed when the stitch length is set to “ 0”.
2. When making a fine-scale adjustment to the stitch regulator gear,
the forwards and reverse stitch lengths should only deviate in value
by a half stitch.
23
56
EN
14
–
Set the stitch length to “0”.
–
Loosen screw (1) and turn the grooved (3) eccentric tappet (2)
according to the illustration. Fasten with screw (1).
–
Loosen screw (4) on the clamping lever. Turn the settings frame (5)
so that the shackles (6) are parallel. Tighten screw (4). This then
fulfils rule 1.
–
The next step is to match up the forwards and reverse stitch
lengths. Sew ten stitches forwards. Press the bartacking lever and
then sew ten stitches backwards. Rotate the eccentric tappet (2) so
that rule 2 is fulfilled.
–
Clockwise = increase forward stitch, decrease
reverse stitch.
–
Counter-clockwise = decrease forward stitch, increase
reverse stitch.
9
Page 12
2.3 Adjusting of feed shaft position and clutch lever position
Rule:
When setting the stitch length to “0“ the groove on the feed shaft front
side is in the vertical position. The feed clutch should be in the central
position.
1
432
–
Set the stitch length to “0”.
–
Loosen the screw (1).
–
Loosen four screws (2) on the lever (3).
–
Turn the shaft (4) so that the groove on its front side is in the
vertical position.
–
Tighten the screw (1).
–
Unscrew the screw on the feed clutch (6) and insert the needle (5)
into the hole left after it. Turn the clutch (6) with hand until the
needle (5) fits 5 mm inwards. This fulfils the rule.
–
Tighten the four screws (2).
–
Remove the needle (5) and screw the screw back again.
56
10
Caution: Risk of injury!
Turnthemainswitchoff.
Only carry out this adjustment when the machine is turned off.
ATTENTION: Danger of breakage!
With large stitch lengths, it is possible that parts within the clutch will
collide if the middle working range of the clutch is not maintained.
Page 13
2.4 Position of the eccentric tappet for the feed movement
Rule:
When the handwheel pointer indicates “0” degrees, the feed lever (1)
should not move when the bartacking lever is pressed down.
1
43 2
EN
–
Turn the handwheel so that the pointer indicates “0“.
–
Loosen screws (2). To make the rough-scale adjustment, turn the
eccentric tappet (3) so that it is approximately in the position
shown in the illustration. Now make the fine-scale adjustment to
the eccentric tappet. Continue until you have found the position
where the feed lever (1) no longer moves when the bartacking
lever is pressed down.
–
Tighten screws at eccentric tappet (3).
–
Fasten the weight (4) in the opposite position to the eccentric (3).
Caution: Risk of injury!
Turnthemainswitchoff.
Only carry out this eccentric adjustment when the machine is turned
off.
ATTENTION: Danger of breakage!
Imprecise settings can shorten the lifespan of the machine.
11
Page 14
2.5 Switching over the feed clutch
Rule:
The clutch should be switched over when it is motionless (i.e., when it
is in the dead centre point of its pendulum motion).
45 6
12 3
–
Loosen the screws (1) on the eccentric tappet (2).
–
Turn the eccentric tappet (2) so that the dash is aligned with the
other dash (3).
–
Loosen the three screws (4). Loosen the adjusting nut (5).
–
Tighten the adjusting nut (5) until you feel it strike (the tightening
increases in jumps).
Push the clutch (6) to the right until the end stop is reached.
Tighten the screws (4).
–
Verify the adjustment. Turn the eccentric tappet with your hand in
the other direction. The resistance during the rotation of the
eccentric tappet should increase significantly when the two dashes
are lined up.
Caution: Risk of injury!
Turnthemainswitchoff.
Only carry out this adjustment when the machine is turned off.
ATTENTION: Danger of breakage!
Imprecise settings can shorten the lifespan of the machine.
12
Page 15
2.6 Position of the eccentric tappet for the switch over of the feed clutch
Rule:
When the handwheel pointer indicates “313” on the scale, the dash (1)
on the eccentric tappet should be lined up with the lower dash (2) on
the V-shaped push rod.
EN
312
–
Loosen screws (3).
–
Turn the handwheel to position “313”.
–
Turn the eccentric tappet in the direction of arrow so that dash (1)
is lined up with dash (2).
–
Turn back the eccentric tappet about 2° and move axially on the
shaft until the middle is between the limit settings.
–
Align the two dashes (1) and (2) again. Tighten the screws (3).
Caution: Risk of injury!
Turnthemainswitchoff.
Only carry out this adjustment when the machine is turned off.
13
Page 16
2.7 Checking the switch over of the feed clutch
Rule:
The feed clutch should be switched over when it is motionless (i.e.,
when it is in the dead centre point of its pendulum motion). This can be
detected from the rotational direction of the belt pulley (1) in front of
and behind the dead centre point.
B
1234
A 274° 281° 94° 101°
B
–
Set the maximum stitch length.
–
Turn the handwheel (A) so that it is positioned at “274” degrees
(refer to Table / A). Push the bartacking lever down. Check if the
rotational direction (B) of the belt pulley (1) corresponds to the
direction specified in the table. Do the same for “281” degrees.
–
If the rotational directions do not correspond to those s pecified in
the table, correct the necessary settings. If the clutch switches over
too soon (on a smaller angle), tentatively loosen the adjusting
nut (5) (see chapter 2.5) and repeat the check. Continue loosening
until you locate the correct position for the nut. If the clutch
switches over too late, tighten the controlling nut (5).
1
14
Caution: Risk of injury!
Turnthemainswitchoff.
Only carry out this adjustment when the machine is turned off.
CAUTION!
Imprecise settings can shorten the lifespan of the machine.
Page 17
2.8 Wheel feed
A
Rule:
1. The wheel feed elevation (A) over the throat plate insert should be
adapted to the material thickness and hardness:
Soft or thick materials – 0.6 mm
Thin materials – 0.2 mm
2. The wheel feed knurling should be adapted to the sewn material
character:
Soft material – the wheel feed with a crosswise knurling to suppress
the prints on the material surface.
Thick material – the wheel feed with larger straight teeth.
1
9
2
5
4
876
EN
15
Page 18
Wheel feed (A) elevation change
–
Unscrew the screws (2) and dismantle the throat plate ( 1).
–
Unscrew the screws (9).
–
Turn the pin (5) with its upper side down.
–
Screw the screws (9) on.
–
Mount the throat plate (1) and screw the screws (2).
Wheel feed replacement
–
Unscrew the screws (2) and dismantle the throat plate ( 1).
–
Unscrew the screws (9).
–
Slide the wheel feed (4) with the pin (5) downwards.
–
Replace the wheel feed (4), slide the pin (5) inside and then
slide them into the throat plate (1).
–
Fix the pin (5) with the screws (9).
–
Adjust the backlash of the teeth (6) with a setting screw (7) by
means of a hexagonal key 2.5 mm (8).
–
Tightening of the screw (7) reduces the backlash, and vice
versa.
–
Turn the hand wheel until the wheel feed turns by a whole
revolution. When turning, check whether the wheel feed has a dead
travel in all positions, which should be as small as possible.
16
Page 19
3. Top feed
3.1 Position of the needle holder with single needle sewing machines
Rule:
The position of the needle holder is to be set according to the picture.
Angular position of
the needle holder
Needle thickness/Nm 70 - 110
3
EN
12
5
4
6
–
Remove the thread guide (1).
–
Loosen screw (2) and turn the needle bar with the right groove
edge (3) to the needle bar axis (in sewing direction) and tighten
screw (2).
–
Bring the needle bar to the upper dead center and loosen the
screw of the needle holder through the bore (4) by using an Allen
key of 2.5 mm (5).
–
Turn the needle holder (6) according to the rule and tighten the
screw.
17
Page 20
3.2 Needle feed
Rule:
1. The needle bar should be laterally adjusted to flush with the presser
bar.
2. The wheel feed holder should be laterally adjusted to make the
clearance (A) approximately twice as wider than the clearance (B).
3. The feed movement of the needle should be set, so that, with
maximum stitch lengths, the needle leaves the throat plate close to
the backward edge of the stitch hole.
B
A
c
1
18
2
–
Loosen screw (1) and set the needle bar to the measure
(C) = 31mm as shown in the diagram. This procedure
accomplishes rule 1.
–
Set the adjustment rings (2) and tighten the screws (1).
Page 21
5
4
Fig. 1
3
6
–
Loosen two screws (3) and the two screws (4). Displace the post
bed feed (5) so that rule 2 is accomplished.
–
Set the maximum stitch length as described in chapter 2.
–
Set the needle to the position in which it leaves the throat plate
insert. Dismantle the rear cover and loosen screw (6). Set the
needle manually to the position shown in fig. 1 and tighten
screw (6).
EN
19
Page 22
3.3 Roller foot
Rule:
1. The location surface on the roller foot holder should be aligned in the
right angle to the longitudinal axis of the machine.
Between the roller foot and the wheel feeder should be a distance of
(A) = 0,03 to 0,16 mm.
2. The position of the roller foot in sewing direction should be set so that
the dis tance (B) = 1,3 to 2,3 mm.
3. The lateral position of the roller foot should be set so that the lower edge
of the roller foot ends with the left-hand edge of the stitch hole (8).
1
56 7
A
3
4
2
8
20
B
A
–
Loosen screw (1). Displace the presser foot bar vertically
according to rule 1. Insert the Philips screw-driver (2) that is part of
the accessories into the hole of the roller foot holder (3) and turn
the presser foot bar (4) together with the roller foot holder (3) until
the Philips screw-driver comes to a right angle with the longitudinal
axis of the machine. Tighten screw (1).
–
Loosen screw (5). Displace the roller foot according to rule 2 and
tighten screw (5).
–
Loosen screw (6). Displace the roller foot according to rule 3 with
the adjusting screw (7) and tighten screw (6).
Page 23
3.4 Roller foot lifting
Rule:
1. The lifting of the roller foot via hand lever should be of 5.4 to 5.6 mm.
2. The lifting of the roller foot via electromagnet should be of 11.5 to
12.5 mm.
3. The lifting of the roller foot via knee lever should be of about 0.2 to
0.4 mm higher than the electromagnetic lifting (if existing).
32
14 3 1
EN
67
5
–
Remove the solenoid of the presser foot lifting.
–
Loosen screw (1). Bring the hand lever (2) into the depicted
position and simultaneously screw in screw (3) until it butts against
the lever (4). The lever (2) remains in the depicted position.
–
Put a spacer of 5.6 mm underneath the roller foot and push the
lever (5) manually according to the figure above until it stops.
Tighten screw (1). This procedure accomplishes rule 1.
–
Remove screw (3) and mount the electromagnet of the presser foot
lifting (6). In order to check whether rule 2 is accomplished, engage
the magnetic core. If the values are not correct, effectuate an
adjustment.
–
Set the lifting of the knee lever according to rule 3 by adjusting
screw (3).
21
Page 24
3.5 Variator of the roller foot drive
Rule:
1. With the correct position of the belt tensioner (1) the distance between
the two cords of the V-belt should be (A) = 1 to 2mm.
2. If the difference between upper and lower feed is set to zero on the
setting nut (3), the graduation scale on the nut (4) should point exactly
to “O”.
5
4
1
3
2
A
B
–
Loosen screw (2) and position the belt tensioner roller (1)
according to rule 1. Tighten screw (2).
–
Set the diameter (B) =34mmby turning the setting nut (3).
–
Make sure that there is no material displacement between upper
and lower feed. Sew two narrow s trips of sewing material of about
30 cm together. If the strips after sewing are vaulted upward or
downward, this indicates a difference between upper and lower
feed. The position of the setting nut (3) must be adjusted
accordingly.
–
After reaching the point of “zero difference”, the graduation scale
on the nut (4) must be adjusted. Turn the nut (4) until the third line
of the scale is on the upper edge of the the nut (3). This marks the
zero position.
–
Secure the nut (4) with screw (5).
22
Page 25
4. Setting of the needle bar and of the hook
4.1 Hook height
Rule:
The distance A should be 1.0 up to 1.1 mm.
A
1
EN
–
Loosen screws (1) and set the height (A) accordingtotherule.
–
Tighten the screws (1).
Caution: Danger of injury !
Turnthemainswitchoff.
Proceed with the hook setting only with the sewing machine
switched off.
23
Page 26
4.2 Needle bar height, play of needle to hook tip, loop stroke
Rule:
When the handwheel pointer indicates “205” degrees (2.3 mm loop
stroke), the hook tip should stand at the needle axis at the stitch
length “0“. Length (A) = 1.5 mm, distance (B) = 0.02 to 0.1 mm.
1
4
2
B
A
7
5
6
3
24
–
Lock the handwheel in loop stroke position (2.3 mm) by using the
locking pin (1) 5 mm, degree “205”.
–
Loosen four screws (2) and turn the hook tip (3) to the needle axis.
–
Loosen screw (4), position the needle bar and needle to the
distance measure (A) and tighten screw (4).
–
Loosen the two screws (5) and screws (6) and displace the hook
column (7) from off the needle to the distance measure (B). Tighten
screws (5) and (6).
–
Check whether the hook tip (3) is positioned in the range of the
needle axis, tighten screw (2)
Page 27
4.3 Hook tip guard
2
Rule:
The guard plate of the hook (1) should prevent a contact between the
needle and the hook tip (2).
1
EN
31
–
Set the maximum stitch length according to the sewing equipment.
–
Dismount the throat plate.
–
Position the hook tip (2) on the needle and adjust the setting screw
of the guard plate (1) by using an Allen k ey of 3 mm (3), so that the
needle does not touch the hook tip (2).
–
Checking: Exert a light pressure on the needle (see arrow) and turn
the hook at the same time.
–
The setting is not incorrect if the guard plate (1) slightly deflects
the needle.
Caution: Danger of injury !
Turnthemainswitchoff.
Proceed with the setting of the hook guard and loop former only with
the sewing machine switched off.
25
Page 28
4.4 Bobbin housing release
1
2
3
Rule:
The distance measure (A) with max. release should be 0,5 mm.
A
1
–
Set the degree “310” on the scale of the handwheel.
–
Loosen screw (2) by the screwdriver (3), set the bobbin housing
release (1) so that the distance measure (A) accordingtorule2is
accomplished.
–
Tighten screw (2).
26
Page 29
4.5 Hook lubrication
Rule:
The screw (2) is to be unscrewed by 1.5 revolution from the position
where the lubrication is fully closed.
EN
21
–
Screw the choking screw (1) by means of a screwdriver (2) and
loosen it back by 1.5 revolution according to the rule.
–
Check whether the oil lubrication is sufficient. Place a sheet of
paper near the hook, run the machine to full speed and observe
whether a trace of sprinkling oil appears on the paper.
–
If you want to choke the lubrication, screw the screw (1) deeper,
and vice versa.
Caution: Danger of injury !
Turnthemainswitchoff.
Proceed with the setting of the hook lubrication only with the sewing
machine switched off.
27
Page 30
5. Thread setting
5.1 Thread regulator, check spring, bolt for the thread lever mechanism
Rule:
1. The right edge of the thread regulator (1) should end at figure 2 on
the scale.
2. The check spring (5) should be set to the distance measure of
(A) = 15 mm. The spring travel consists of about 30°.
3. The slot position of the bolt (8) should form an angle 30° on the left from
vertical.
12
A
564 3
78
30°
–
Loosen screw (2), push the thread regulator (1) according to rule 1
to end at figure 2, tighten screw (2).
–
Loosen screw (3). Turn the stop sleeve (4) in the direction of the
arrow until the check spring (5) comes off the body (6). Turn the
stop sleeve (4) against the direction of the arrow until the check
spring (5) touches the body (6). Turn both parts (4) and (6)
together to reach the distance measure (A). Detain the body (6)
and turn the stop sleeve (4) for another 30° against the arrow.
Detain the parts (4) and (6), tighten screw (3).
–
Insert a 3 mm Allen key in the holes (7) and loosen the screws.
Bring the bolt (8) into the correct position according to rule 3 and
tighten screws (7).
28
Page 31
5.2 Bobbin winder
Rule:
1. When the bobbin winder is switched off, the distance between
bobbin winder wheel and belt pulley should be (A) = 0.8 mm.
2. The winding procedure s hould stop automatically, when the bobbin
is filled up to 0.5 mm underneath the the bobbin edge.
A
1
2
–
Turn the belt pulley to the top using the screws (1). Push the
toothed belt to the right so that both screws (1) are accessible.
Loosen screws (1) and set the distance measure (A) according to
rule 1, tighten screws (1).
–
Determine the bobbin filling by adjusting screw (2). Screw in
screw (2) for 1 to 2 mm, but a bobbin on the bobbin winder shaft
and wind on thread. Check the filling level as soon as the bobbin
winder turns off. If necessary, change the position of the screw (2)
until rule 2 is fulfilled.
EN
29
Page 32
6. Thread cutter
6.1 Thread-pulling knife height
Rule:
At the turning to its adjusting position the thread-pulling k nife (1)
should touch the counter knife (3) without pressure.
31
4
31
2
5
–
Slightly turn the thread-pulling knife (1) so that its locking screw
(2) is accessible for the hexagonal key 2.5 mm (5).
–
Loosen the screw (2) and lift the thread-pulling knife (1) in the
arrow (4) direction to touch the counter knife (3). The
thread-pulling knife must not develop any pressure on the counter
knife (3). The cutting pressure between the knives (1) and (3) will
develop during thethread-pulling knife (1) slight turning to the
cutting position due to the elevated position of its cutting edge
surface.
–
Fix thethread-pullinge (5) with the screw (2).
Caution: Danger of injury !
Turnthemainswitchoff.
Proceed with the thread cutter setting only with the sewing
machine switched off.
Attention!
When the pressure of the counter knife is set too high this r esults in a
higher knife wear.
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6.2 Starting position of the thread-pulling knife
Rule:
If the thread-pulling knife (1) is locked in the starting position with a
needle shank (2), the electric motor shock absorber (4) and the lever
(3) should be positioned at the stop.
21 6
EN
–
Dismantle the throat plate insert in the recess (6).
–
Loosen the screw (5) with the hexagonal key 3 mm.
–
With your hand slightly turn the thread-pulling knife (1) to the
starting position and lock it with the needle shank (2).
–
Turn the lever (3) in the arrow direction to the stop and then fix it
with the screw (5).
–
Remove the needle (2) and mount the throat plate insert back
again.
Caution: Danger of injury !
Turnthemainswitchoff.
Proceed with the thread cutter setting only with the sewing
machine switched off.
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435
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6.3 Angle position (timing) of control cam and clearance between cam and roller
Rule:
If the control cam (3) is locked with the pin (1) according to the picture:
1. On the hand wheel there should be the angle 100°.
2. Between the control c am (3) and the roller (4) there should
be the distance (A) = 0,1 mm.
EN
A
45312
–
Loosen both locking screws of the cam (3) with the hexagonal key
3mm(5).
–
Slightly turn the hand wheel to the angle 100°.
–
Insert the locking pin (1) according to the picture and lean it
against the shaft ( 2).
–
Insert the feeler gauge 0.1 mm between the cam (3) and the roller
(4).
–
Slide the cam (3) to the left fully to the stop until the clearances
inside the mechanism are set.
–
Fix the cam (3) with one locking screw with the key (5).
–
Remove the pin (1) and tighten also the other locking screw of the
cam (3).
Caution: Risk of injury!
Turnthemainswitchoff.
Proceed with the setting of the control cam only with the sewing
machine switched off.
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6.4 Bobbin thread clamp
Rule:
The clamping force of the spring (1) should be high enough so as the
tension needed to pull out the bottom thread is approximately the same
as the tension needed to pull this thread from the hook bobbin.
1
–
Sew and cut the threads.
–
Pull the bottom thread. If its tension is too low (the thread under the
spring can easily slip out), turn the hand wheel to the angle 290°,
tilt the hook cover up and slightly bend the s pring (1) downwards
with a screwdriver.
–
Repeat the seam sewing, do the thread cutting, perform a test of
the tension needed to pull the thread out, and slightly bend the
spring, until the thread is reliably r etained with the spring.
Caution: Risk of injury!
Turnthemainswitchoff.
Only adjust the clamping spring when the machine is turned off.
CAUTION!
Sewing problems can result when the clamping spring is improperly
adjusted.
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7 Electronic control and sewing machine drive - positioning motor
All operating instructions and parameter sheets are available at the
manufacturers´ websites (see www.efka.net,
www.duerkopp-adler.com, ww w.hohsing.com, etc.).
Selected instructions concerning the control and drive setting needed
for the operators are included in the Operating instructions.
Selected instructions needed for the technician to set the drive are
included in the Operating instructions.
Important notes concerning electrostatic discharges (ESD)
Caution!
Before effectuating any works on electronic components: Turn off the
main switch. Remove the plug from the socket.
EN
Electrostatic discharges can cause damage to PCBs and other
components. You can obtain a certain protection by wearing anti-static
gloves or wrist-wraps that you can connect for grounding on the mass
of any unpainted metal piece of the machine head or on the switch
cabinet.
Handle the PCBs with utmost caution. They are very sensitive towards
electrostatic discharges. Hold the PCBs only at their edges.
Put the PCBs after unwrapping or after dismounting with their
components upside onto a grounded statically discharged surface.
We recommend to use a conductive foam underlay but not as the
protective cover of the PCB.
Pay attention not to pull the PCBs over any surface.
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7.1 Terminals to PCB connections - electromagnetic variant
Description of DA178-2 (9850 688001) switchboard connection
X11 - main connection cable to control unit
X12 - keypad (Taster)
X13 - terminals for solenoid connection
1,2,3 – supply voltage +24V
4 - VR (backtacking)
5 - FL (foot lifting)
6 - FS (thread tensioner)
7 - STL OUT (half stitch)
8 - FA (thread trimmer)
X14 - bobbin thread monitor
X15 - connection of side switchboard when using DAC control
(with cable 9870 867018)
X16*- connection of connecting cable 9870 688002 for connector on base plate
(thread trimmer solenoids, sewn material edge horizontal trimmer)
X17 - microswitch of sewn material edge trimmer (vertical, oblique)
X18 - sewn material edge trimmer motor
F1 - sewn material edge trimmer resettable fuse
R1 - Autoselect resistor (sewing machine class selection)
S11 - tilt sensor
J1 - switch; if the sewing machine has a direct drive (DAC control, side switchboard), switch J1 off, otherwise
switch J1 on.
* Connection of edge trimmer solenoids to the grey connector on the base plate is to be made between FA and
+ (white and brown).
Connection of the horizontal edge trimmer is to be made between + and GND (brown and green).
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7.2 Terminals to PCB connections - pneumatic variant
EN
Description of DA199_2 (9850 838000) switchboard
X11 - 37-pole connector (to control box)
X12 - thread tensioner valve
X13 - secondary thread tensioner valve
X14 - bartacking valve
X15 - sewing foot valve
X16 - keypad
X17 - bobbin thread monitor
X18 - light barrier
X19 - 1. +24V
2. FA (thread trimming)
3. FF3 (functional outlet 3, e. g. puller, pneumatic material edge trimmer)
4. STL (stitch length valve)
5. +24V
6. FF2 (functional outlet 2)
7. NK (needle cooling)
8. FK (thread clamp)
9. /DB3000 (needle switch off)
10. 0V
FW/STL(FA) – auxiliary outlet (thread wiper/zero stitch length at thread trimming)
X20 - external outlet controlled with auxiliary pushbutton on keypad (Imax=50mA)
X21 - connection of auxiliary cable for bottom distribution (FA, +24V, GND)
X22 - external blocking of operation (e. g. thread lever guard switch, etc.)
X23 - connection of a side DAC switchboard (direct drive)
X24 - material edge trimmer microswitch
X25 - material edge trimmer mini motor
S1 - tilt sensor
S2 - sewing machine operation blocking mode; switch in ON position means that the sensor is without function
SENS. S1 = tilt sensor on switchboard; EXT.SENS. = sensor in connector X22
DAC SENS. = sensor on DAC side switchboard (direct drive)
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DÜRKOPP ADLER AG
Potsdamer Str. 190
33719 Bielefeld
Germany
Phone +49 (0) 521 925 00
E-Mail: service@duerkopp-adler.com
www.duerkopp-adler.com
Subject to design changes - Printed in Germany - © Dürkopp Adler AG - Service Instructions - 0791 884651 EN - 00.0 - 07/2014
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