Duerkopp Adler 868 Operating instructions

868
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.:
01/2009 Rev. index: 00.0 Printed in Federal Republic of Germany 0791 868641
D
GB

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Eigentum der Dürkopp Adler AG und urheberrechtlich geschützt. Jede, auch auszugsweise Wiederverwendung
dieser Inhalte ist ohne vorheriges schriftliches Einverständnis der Dürkopp Adler AG verboten.
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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 868
(Edition 01/2009)
1. General notes
1.1 Gauges..................................................... 3
1.2 Descriptionofthelockingpositions.................................... 6
1.3 Graduation on the handwheel ....................................... 7
2. Sewing machine
2.1 Positionofthearmshaftcrankonthearmshaft............................ 8
2.2 Upper and lower toothed belt wheel / toothed belt ........................... 9
2.2.1 Position of the upper toothed belt wheel ................................. 9
2.2.2 Position of the lower toothed belt wheel ................................. 10
2.3 Bottom feed and stitch regulator gear .................................. 11
2.3.1 Basicsettingofstitchadjustment..................................... 11
2.3.2 Adjusting the 2nd stitch length....................................... 13
2.3.3 Positionoftheadvanceshaft ....................................... 14
2.3.4 Feed gear basic setting ........................................... 15
2.4 Needle bar linkage .............................................. 16
2.4.1 Align the needle bar linkage laterally ................................... 16
2.4.2 Transmissionlever.............................................. 17
2.4.3 Threadlever ................................................. 18
2.5 Postbedfeed................................................. 19
2.5.1 Aligningthepostbedfeed......................................... 19
2.5.2 Feeding motion of the feed dog ...................................... 20
2.5.3 Liftingmotionofthefeeddog ....................................... 21
2.5.4 Feeddogheight ............................................... 22
2.5.5 Balanceweight................................................ 23
2.5.6 Needle penetration in feeding direction ................................. 24
2.6 Hook, looping stroke and needle bar height............................... 25
2.6.1 Hookheight.................................................. 25
2.6.2 Looping stroke ................................................ 27
2.6.3 Needle bar height .............................................. 28
2.6.4 Distance between hook and needle.................................... 29
2.6.5 Needle guard ................................................. 30
2.7 Bobbin case opening ............................................ 31
2.7.1 General .................................................... 31
2.7.2 Setting of the bobbin case opening .................................... 31
2.7.3 Timing of opening .............................................. 33
2.8 Feeding foot and presser foot ....................................... 34
2.8.1 Basic stroke gearing setting ........................................ 34
2.8.2 Feeding foot and presser foot stroke ................................... 36
2.8.3 Stroke motion of the feeding foot ..................................... 37
2.8.4 Sewingfootpressure............................................ 38

Contents Page:
2.9 Stitch length limitation ............................................ 39
2.10 Stitch equality of the forward and backward stitch ........................... 40
2.11 Sewingfootlifting .............................................. 41
2.11.1 Mechanical sewing foot lifting ....................................... 41
2.11.2 Height of the sewing feet arrested with hand lever........................... 42
2.11.3 Heightoftheliftedsewingfeet....................................... 43
2.12 Thread-guiding parts ............................................ 44
2.12.1 Thread regulator ............................................... 44
2.12.2Threadtake-upspring............................................ 45
2.13 Bobbin winder................................................. 46
2.14 Threadcutter................................................. 48
2.14.1 General .................................................... 48
2.14.2 Thread-pulling knife height ......................................... 49
2.14.3 Thread-pulling knife ............................................. 50
2.14.4 Swing range of the thread-pulling knife ................................. 52
2.14.5 Counter-knife and lower thread clamp .................................. 53
2.14.6Trimmingposition .............................................. 55
2.15 Potentiometerinthearm.......................................... 56
2.15.1 Basic setting without control panel .................................... 57
2.15.2 Basic setting with the control panel V810 or V820 ........................... 57
2.15.3Checkthepotentiometeradjustment................................... 58
2.16 Connections PCB .............................................. 59
3. Oil lubrication
3.1 Hooklubrication ............................................... 61
3.2 Maintenance ................................................. 62

GB
1. General notes
The present service instructions describes the adjustment of the
special sewing machine 868.
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 disconnect the machine from the pneumatic 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 instructions 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 do the adjustment
following the described order.
For all setting operations of parts involved in the stitch formation a new
needle without damage has to be inserted.
Machine covers having to be screwed off and on again for checking
and adjusting operations are not mentioned in the text.
Hint:
Some of the shafts of the special sewing machine 867 are provided
with flat spots. This facilitates the adjustment considerably.
In case of all adjustments on flat spots, it is always the first screw in
rotation direction that 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 and can be put
at the bottom side of the oil pan.
3
1

Further gauges:
Setting gauge 0868 290113
chapter 2.4 Needle bar linkage
Setting gauge 0868 290153
chapter 2.5 Post bed feed
Setting gauge 0868 290163
chapter 2.5 Post bed feed
Setting gauge 0868 290184
chapter 2.3.3 Position of the advance shaft
Setting gauge 0868 290020
chapter 2.4.2 Transmission lever
Setting gauge 0868 290194
chapter 2.4 Needle bar linkage
chapter 2.5 Post bed feed
Auxiliary gauge 0667 295050
chapter 2.3.1 Basic setting of stitch adjustment
4

Notes:
5
GB

1.2 Description of the locking positions
With the locking pin 1and the arresting grooves 2and 3in the arm
shaft crank 4the sewing machine can be arrested in two adjusting
positions.
Position I = Locking pin Ø5mmfor large groove
= Looping stroke, needle bar height
Position II = Locking pin Ø3mmfor small groove
= Needle bar at its upper dead centre, 0° on the
handwheel.
6
2
4
1
3