Duerkopp Adler 669 Premium Operating instructions

669
Spezialnähmaschine
Serviceanleitung
Service Instructions
Postfach 17 03 51, D-33703 Bielefeld • Potsdamer Straße 190, D-33719 Bielefeld
Telefon +49 (0) 521 / 9 25-00 • Telefax +49 (0) 521 / 9 25 24 35 • www.duerkopp-adler.com
Ausgabe / Edition: Änderungsindex Teile-Nr./Part.-No.:
09/2009 Rev. index: 00.0 Printed in Federal Republic of Germany 0791 669641
D
GB

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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 - 2009

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
instruction book and operated by persons with appropriate training.
2. Before putting into service also read the safety rules and
instructions of the motor supplier.
3. The machine must be used only for the purpose intended. Use of
the machine without the safety devices is not permitted. Observe all
the relevant safety regulations.
4. When gauge parts are exchanged (e.g. needle, presser foot, needle
plate, feed dog and bobbin) when 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.
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, 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.

GB
Contents Page:
Service Instructions Class 669
(Edition 09/2009)
1. General
1.1 Gauges..................................................... 3
1.2 Descriptionofthesettingpositions.................................... 4
2. Sewing machine
2.1 Positionofthearmshaftcrankonthearmshaft............................ 5
2.2 Upper and lower toothed belt wheel / toothed belt ........................... 6
2.2.1 Position of the upper toothed belt wheel ................................. 6
2.2.2 Position of the lower toothed belt wheel ................................. 7
2.3 Bottom feed and stitch regulator gear .................................. 8
2.3.1 Basicsettingofstitchadjustment..................................... 8
2.3.2 Adjust the 2nd stitch length ........................................ 10
2.3.3 Positionofthefeeddoginthethroatplatecutout........................... 11
2.3.4 Feeding motion of the feed dog ...................................... 12
2.3.5 Liftingmotionofthefeeddog ....................................... 13
2.3.6 Feeddogheight ............................................... 14
2.3.7 Neutralizingthefeeddogstroke...................................... 15
2.4 Transmissionlever.............................................. 16
2.5 Needle bar linkage .............................................. 17
2.5.1 Align the needle bar linkage laterally ................................... 17
2.5.2 Needle penetration in feeding direction ................................. 18
2.6 Hook, looping stroke and needle bar height............................... 19
2.6.1 Looping stroke, distance between the hook point and needle .................... 19
2.6.2 Needle bar height .............................................. 21
2.7 Throatplatebase .............................................. 22
2.8 Feeding foot and presser foot ....................................... 23
2.8.1 Feeding foot and presser foot stroke ................................... 23
2.8.2 Stroke motion of the feeding foot ..................................... 24
2.8.3 Sewingfootpressure............................................ 25
2.9 Stitch length limitation ............................................ 26
2.10 Stitch equality of the forward and backward stitch ........................... 27
2.11 Sewingfootlifting .............................................. 28
2.11.1 Mechanical sewing foot lifting ....................................... 28
2.11.2 Height of the sewing feet arrested with hand lever........................... 29
2.11.3 Heightoftheliftedsewingfeet....................................... 30
2.12 Thread-guiding parts ............................................ 31
2.12.1 Thread regulator ............................................... 31
2.12.2Threadtake-upspring............................................ 32
2.13 Bobbin winder................................................. 34
2.14 Threadtrimmer................................................ 37
2.14.1 Mechanical part ............................................... 37

Contents Page:
2.14.2Threadtrimmercamposition........................................ 38
2.14.3Playbetweentherollerandthecontrolcam .............................. 39
2.14.4Settingthecuttingpressure ........................................ 40
2.15 Potentiometerinthearm.......................................... 41
2.15.1 Basic setting without control panel .................................... 41
2.15.2 Basic setting with the control panel V810 or V820 ........................... 42
2.15.3Checkthepotentiometeradjustment................................... 43
2.16 Connections PCB .............................................. 44
3. Oil lubrication
3.1 Hooklubrication ............................................... 46
4. Maintenance ................................................. 47

GB
1. General
The present service instruction describes the adjustment of the special
sewing machine 669.
ATTENTION!
The operations described in the service instructions must only be
executed by qualified staff or correspondingly instructed persons
respectively!
Caution: Risk of injury!
In case of repair, alteration or maintenance work turn off the main
switch and make sure to disconnect the machine from the air supply
system.
Carry out adjusting operations and functional tests of the running
machine only under observation of all safety measures and with
utmost caution.
The present service instruction describes the adjustment of the sewing
machine in an appropriate sequence. Please observe in this
connection that various setting positions are interdependent. Therefore
it is absolutely necessary to perform the adjustment following the
described order.
For all setting operations of parts involved in the stitch formation use a
new needle without any damage.
Machine covers having to be screwed off and on again for checking
and adjusting operations are not mentioned in the text.
Please note:
Some shafts of the special sewing machine 669 are provided with flat
spots. This facilitates the adjustment considerably.
In case of adjustments on flat spots the first screw in rotation direction
is put on such a flat spot.
1.1 Gauges
The locking pin 1 required for adjusting the machine belongs to the
serial equipment of the machine. It is in the accessories of the
machine.
3
1

1.2 Description of the setting positions
The sewing machine can be locked in 2 different setting positions with
the locking pin 1 and the arresting notches 2 and 3 on the arm shaft
crank 4.
Position I = Locking pin Ø 5 mm for large groove
= Looping stroke, needle bar height
Position II = Locking pin Ø 3 mm for small groove
= Needle bar at its upper dead center
4
2
4
1
3

2. Sewing machine
2.1 Position of the arm shaft crank on the arm shaft
Caution: Risk of injury!
Turn off the main switch.
Check and set the position of the arm shaft crank only with the sewing
machine switched off.
Standard checking
The arm shaft crank 1 is fastened on the arm shaft 4 with the three
screws 2.
The screws must sit on the flat spot 3.
Correction
–Loosen screws 2 at the arm shaft crank.
–Twist arm shaft crank on the shaft in such a way that the screws 2
sit on the flat spot 3.
–Push arm shaft crank axially to the right as far as it will go.
–Tighten screws 2.
5
GB
21
1
2
3
4

2.2 Upper and lower toothed belt wheel / toothed belt
2.2.1 Position of the upper toothed belt wheel
Caution: Risk of injury!
Turn off the main switch.
Check and set the position of the upper toothed belt wheel only with
the sewing machine switched off.
Standard checking
The toothed belt wheel 2 is fastened on the arm shaft 4 with two
threaded pins. The screws must sit on the flat spot 1.
The distance between the toothed belt wheel 2 and the bobbin winder
wheel 3 must amount to 0.8 mm when the bobbin winder is switched
off.
–Check distance between toothed belt wheel 2 and bobbin winder
wheel 3 by means of a feeler gauge.
Correction
–Loosen the threaded pins in the toothed belt wheel.
–Turn the toothed belt wheel, until the threaded pins sit on the flat
spot 1 of the arm shaft 4.
–Set lateral distance of 0.8 mm between toothed belt wheel 2 and
bobbin winder wheel 3 using the feeler gauge.
–Tighten the threaded pins in the toothed belt wheel.
6
4321 32

2.2.2 Position of the lower toothed belt wheel
Caution: Risk of injury!
Turn off the main switch.
Check and set the position of the lower toothed belt wheel only
with the sewing machine switched off.
Standard checking
The screws in the toothed belt wheel 4 must sit on the flat spot 1 of the
lower shaft 5.
The toothed belt wheel must be positioned in a way that when turning
the handwheel the toothed belt 3 bears against the belt tensioner
ring 2 without being dislocated.
–Check the position of the toothed belt wheel.
Correction
–Pull out the toothed belt from the lower toothed belt wheel.
–Loosen the threaded pins in the toothed belt wheel.
–Turn the toothed belt wheel 4, until the screws sit on the flat spot of
the arm shaft 5.
–Tighten the threaded pins in the toothed belt wheel.
–Put the toothed belt on the toothed belt wheel again.
–Check the course of the toothed belt.
Attention Danger of Breakage!
After replacing the toothed belt, check the following:
Hook adjustment (see chapter 2.6), feeding motion of the feed dog
(see chapter 2.3.4) and lifting motion of the feed dog (see
chapter 2.3.5).
7
GB
432
1
5

2.3 Bottom feed and stitch regulator gear
2.3.1 Basic setting of stitch adjustment
Caution: Risk of injury!
Turn off the main switch.
Set the basic setting of stitch adjustment only with the sewing machine
switched off.
Standard checking
When the setting wheel 5 is in “0" position, the stitch regulator gear
should have the least possible play.
–Set stitch length “0" at the setting wheel 5.
–Check the play of the stitch regulator gear at the stitch regulator
lever 2.
Correction
–Unclamp the spring 1.
–Retain the setting wheel 5 using the wrench 3.
–Unscrew the screw 4 and remove the setting wheel 5.
–Turn shaft 7 to the right using a 10 mm open-end wrench until the
stitch regulator lever 1 has the least possible play.
Attention Danger of Breakage!
Do not turn the shaft too far to the right.
The stitch regulator parts may jam and the
maximum stitch length of 9 mm and 6 mm
can respectively no longer be achieved.
–Setscale6to“0".
–Put setting wheel 5 on again and tighten it with screw 4.
–Put the spring 1 again.
–Check the clearance of the stitch regulator lever 2.
8
7
21 65 4 3

Adjust eccentric
The eccentric 2 has to be adjusted in such a way that the open side 3
of the eccentric slot superimposes the screw 1.
–Loosen the screw 1.
–Turn the eccentric 2 in such a way that the open side 3 of the
eccentric slot be oriented to the screw 1.
–Fasten the screw 1.
9
GB
21
3
2

2.3.2 Adjust the 2nd stitch length
Caution: Risk of injury!
Turn off the main switch.
Set the basic setting of stitch adjustment only with the sewing
machine switched off.
–Set the upper setting wheel 1 to “4".
–Unscrew the screw 2 and remove the setting wheel 3.
–Using a 10 mm open-end wrench, turn with caution the shaft 5
clockwise as far as it will go.
–Setscale4to“4".
–Put setting wheel 3 on again and tighten it with screw 2.
10
43 21 45

2.3.3 Position of the feed dog in the throat plate cutout
Caution: Risk of injury!
Turn off the main switch.
Set and check the feed dog only with the sewing machine switched off.
Standard checking
The feed dog 1 should be positioned so that the distance to the right
and left edge of the throat plate cutout 2 is identical.
Correction
–Loosen screw 3.
–Shift laterally the plate 4 correspondingly.
–Tighten screw 3.
11
GB
21 43

2.3.4 Feeding motion of the feed dog
Caution: Risk of injury!
Turn off the main switch.
Check and set the feeding motion of the feed dog only when the
machine is switched off.
Standard checking
The markings on the eccentric 2 and the connecting rod 1 should lie
next to each other when the machine is in “looping stroke position”.
–Arrest the machine head in “looping stroke position”.
–Check the position of the markings.
Correction
–Loosen the screws on the thrust eccentric 2.
–Adjust the thrust eccentric 2.
–Tighten the screws on the thrust eccentric 2.
–Check the position of the markings.
12
21
21

2.3.5 Lifting motion of the feed dog
Caution: Risk of injury!
Turn off the main switch.
Check and set the lifting motion of the feed dog only with the sewing
machine switched off.
Standard checking
The markings on the eccentric 1 and the connecting rod 2 should lie
next to each other when the machine is in “looping stroke position”.
–Arrest the machine head in “looping stroke position”.
–Check the position of the markings.
Correction
–Loosen the screws on the lifting cam 1.
–Adjust the lifting cam.
–Fasten screws on the lifting cam 1.
–Check the position of the markings.
13
GB
21
21

2.3.6 Feed dog height
Caution: Risk of injury!
Turn off the main switch.
Check and set the feed dog height only when the machine is
switched off.
Standard checking
Machines without feed dog stroke
The feed dog should have the same height as the throat plate.
Machines with feed dog stroke
For a safe forward movement of the material the feed dog 3 must in its
highest position be 0.6 – 0.7 mm above the throat plate surface.
–Turn the handwheel until the feed dog 3 has reached its highest
position.
–Check the feed dog height 3.
Correction
–Arrest the sewing feet in lifted position.
–Turn the handwheel until the feed dog 3 has reached its highest
position.
–Loosen the screws 1 and 2 on the arm.
–Adjust the screw 1 (upwards or downwards), so that the feed dog
stands 0.6 – 0.7 mm above the throat plate.
–Fasten screws 1 and 2.
14
21
3
+
-

GB
76
2.3.7 Neutralizing the feed dog stroke
Caution: Risk of injury!
Turn off the main switch.
The removal of the slide for the feed dog should only be done with
the sewing machine switched off.
The feed dog stroke can be neutralized through removing the slide 7
for example for binding operations.
–Remove the cover 1, throat plate 3, feed dog 4 and throat plate
base 5.
–Removetheslide7.
For this purpose, unscrew both screws 6 and take out the slide 7.
–Replace the throat plate base 5 against the throat plate base
0669 200204.
(The throat plate base is part of the sewing equipment 669- E4/6
and 669- E 5/6).
–With machines equipped with thread trimmer, screw on the counter
knife 2 and set the cutting pressure (see chapter 2.14.4).
–Screw on the feed dog 4, throat plate 3 and cover 1.
15
5 4 321

2.4 Transmission lever
Caution: Risk of injury!
Turn off the main switch.
Check and set the transmission lever only when the machine is
switched off.
Standard checking
The lever 3 transmits the movement of the advance shaft to the needle
bar linkage.
The lever 3 must be positioned in a way that the distance between the
surface of the arm 1 and the center of the bolt 2 is 123,6 mm with the
stitch length set to “0".
–Set the stitch length to “0".
–Check the distance between the top edge 1 and the bolt center 2.
Correction
–Loosen the screws 4 at the lower transmission lever.
–Loosen the screw 5 at the upper transmission lever.
–Adjust the lever 3 to fit the given dimension.
–Fasten screws 4 and 5 again.
16
32 1 4
5
123,6 mm