Duerkopp Adler 910 Operating instructions

910
CNC-Nähanlage für freie Nahtkonturen
CNC sewing unit for free seam contours
Bedienanleitung / Operating Instructions
Aufstellanleitung / Installation Instructions
Serviceanleitung / Service Instructions
Postfach 17 03 51, D-33703 Bielefeld Potsdamer Straße 190, D-33719 Bielefeld Deutsch/Englisch
Telefon [phone] Telefax+49(0)521/9252435www.duerkopp-adler.com
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Ausgabe / Edition: Änderungsindex Teile-Nr.:/Part-No.:
04/2007 Rev. index: 01.0 Printed in Federal Republic of Germany 0791 910001

Alle Rechte vorbehalten.
Eigentum der Dürkopp Adler AG und urheberrechtlich geschützt. Jede, auch auszugsweise
Wiederverwendung dieser Inhalte ist ohne vorheriges schriftliches Einverständnis der Dürkopp Adler AG
verboten.
All rights 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 ã2007 - Dürkopp Adler AG

Foreword
This instruction manual is intended to help the user to become familiar
with the machine and take advantage of its application possibilities in
accordance with the recommendations.
The instruction manual contains important information on how to
operate the machine securely, properly and economically. Observation
of the instructions eliminates danger, reduces costs for repair and
down-times, and increases the reliability and life of the machine.
The instruction manual is intended to complement existing national
accident prevention and environment protection regulations.
The instruction manual must always be available at the machine/sewing
unit.
The instruction manual must be read and applied by any person that is
authorized to work on the machine/sewing unit. This means:
–Operation, including equipping, troubleshooting during the work
cycle, removing of fabric waste,
–Service (maintenance, inspection, repair) and/or
–Transport.
The user also has to assure that only authorized personnel work on the
machine.
The user is obliged to check the machine at least once per shift for
apparent damages and to immediatly report any changes (including the
performance in service), which impair the safety.
The user company must ensure that the machine is only operated in
perfect working order.
Never remove or disable any safety devices.
If safety devices need to be removed for equipping, repairing or
maintaining, the safety devices must be remounted directly after
completion of the maintenance and repair work.
Unauthorized modification of the machine rules out liability of the
manufacturer for damage resulting from this.
Observe all safety and danger recommendations on the machine/unit!
The yellow-and-black striped surfaces designate permanend danger
areas, eg danger of squashing, cutting, shearing or collision.
Besides the recommendations in this instruction manual also observe
the general safety and accident prevention regulations!

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.

Index Page:
Part 3: Service Instructions for the Class 910
(Edition: 04/2007)
1. General notes ................................................ 3
2. Arm shaft
2.1 Preparatoryadjustmentwork........................................ 4
2.2 Assemblyofthecrank............................................ 5
2.3 Armshaftpositioning ............................................ 6
2.4 Bevel gear for the hand wheel ....................................... 8
2.5 Adjust bobbin winder............................................. 9
2.6 Thread-trimmer cam ............................................. 10
2.7 Sewingfoothubeccentric.......................................... 11
2.8 Crankshaft drive to the hook shaft..................................... 12
2.9 Sewingmotorclutch............................................. 13
2.10 Referencepositionofthesewingmotor................................. 14
2.10.1Positionoftheinitiator............................................ 14
2.10.2Adjustreferenceposition.......................................... 15
3. Hook, looping stroke and needle bar height
3.1 Drivershaft .................................................. 16
3.2 Gearsegmentonthecamshaft ...................................... 17
3.3 Gearsegmenttothedrivershaft...................................... 18
3.4 Needle bar height............................................... 19
3.5 Distance between hook tip and needle .................................. 20
3.6 Looping stroke and needle protection................................... 21
4. Thread-guiding parts
4.1 Threadcontrollerspring........................................... 22
4.2 Thread regulator ............................................... 24
4.3 Adjustingthethreadtension........................................ 25
4.3.1 Mechanical adjustments to the thread tension ............................. 25
4.3.2 Calibrating................................................... 25
4.4 Thread feeding mechanism......................................... 26
5. Thread trimmer
5.1 Thread trimmer magnet ........................................... 27
5.2 Driveshaftposition.............................................. 28
5.3 Position of the hook knife .......................................... 30
5.4 Throatplateremoval............................................. 31
5.5 Cutting pressure / Position of the stationary knife ........................... 32
5.6 Fixing plate for the magnet ......................................... 33
5.7 Thread guiding sheet ............................................ 34
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Index Page:
6. Material feed
6.1 Driveandmotorpositioning ........................................ 35
6.2 Referenceposition.............................................. 36
6.3 Positionofthefabricclampstotherestplates............................. 38
6.4 Sewingfoot.................................................. 39
7. Oil lubrication
7.1 Oilcirculation................................................. 41
8. Maintenance ................................................. 42

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1. General notes
These service instructions describe the adjustments that can be made
to the sewing unit 910.
ATTENTION!
The operations described in these service instructions may only be
carried out by qualified staff or other appropriately trained persons!
Caution: danger of injury!
Always switch off main switch before any repair, alteration or
maintenance.
Carry out adjusting operations and functional tests of the running
machine only under observation of all safety measures and with
utmost caution.
These service instructions describe the adjustment of the sewing unit
in a logical order. Please observe that various setting positions are
dependent on each other. The adjustment process must therefore be
carried out in the order given.
For all adjustments of parts involved in the stitch formation, a new
undamaged needle must be inserted.
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2. Arm shaft
2.1 Preparatory adjustment work
Some of the adjustments at the arm shaft 1 can be carried more easily
if the thread trimming mechanism 3 is removed.
Caution: danger of injury!
Switch off the main switch.
Remove and mount thread trimming mechanism only when the sewing
unit is switched off.
Remove mechanism
–Unscrew arm cover.
–Loosen screw 4 at the thread trimmer magnet.
–Unscrew screws 2 and 5 and take off thread trimming
mechanism 3.
Mount mechanism
–Push thread trimming mechanism 3 on the magnet and place it on
the machine head.
–Insert screws 2 and 5 and screw tight.
–Tighten screw 4 at the thread trimmer magnet.
–Adjust thread trimmer (see section 5.5).
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2.2 Assembly of the crank
Caution: danger of injury!
Turn off the main switch.
Remove and mount crank only when the sewing unit is switched off.
Important
The crank 4 has to be mounted on the arm shaft 1 in such a way that
the pivot 3 of the screw 2 reaches into the drill-hole on the arm shaft.
The screw 2 is the first screw in the direction of rotation.
Assembly
–Push crank 4 on arm shaft 1.
–Turn crank 4 so that its first drill-hole in the direction of rotation is
located above the drill-hole in the arm shaft 1.
–Insert screw 2 and tighten.
–Insert screw 5 and tighten.
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2.3 Arm shaft positioning
Caution: danger of injury!
Turn off the main switch.
Check and adjust position of the arm shaft only when the sewing
unit is switched off.
Note and control
The arm shaft 1 should have no axial backlash, but it must not move
too sluggishly.
Check the arm shaft with regard to axial backlash and sluggishness.
Adjustment
–Loosen screws at the bobbin winder wheel 3.
–Loosen screws at the adjusting ring 4.
–Loosen screws at eccentric 5.
–Loosen screws at the bevel gear 6.
–Loosen screw at the adjusting ring 7.
–Loosen screws at the thread trimmer cam 9.
–Loosen screws at the motor clutch10.
–Push arm shaft crank 2 axially to the right as far as it will go.
–Push adjusting ring 8 against the bearing bush, and tighten screws.
–Check arm shaft for axial backlash and smooth operation.
–Push adjusting ring 7 to the right against the bearing bush, and
tighten screws.
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–Loosen screws at the bobbin winder wheel 3.
(For adjustment, see section 2.5).
–Tighten screws at the adjusting ring 4.
–Tighten screws at eccentric 5.
For adjustment, see section 2.7).
–Tighten screws at the bevel gear 6.
(For adjustment, see section 2.4).
–Tighten screws at the thread trimmer cam 9
(for adjustment see section 2.6).
–Tighten screws at the motor clutch 10.
(For adjustment, see section 2.9).
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2.4 Bevel gear for the hand wheel
Caution: danger of injury!
Turn off the main switch.
Check and adjust bevel gear only when the sewing unit is switched off.
Note and control
The bevel gear 1 has to be positioned on the upper shaft in such a way
that when the handwheel 2 is engaged there is as little clearance as
possible between bevel gear 1 and bevel gear 3.
–Engage handwheel 2.
–Verify that there is as little clearance as possible between bevel
gear 1 and bevel gear 3.
Adjustment
–Loosen screws at the bevel gear 1.
–Engage handwheel 2.
–Press bevel gear 1 against the toothed wheel 3 and tighten
fastening screws.
–Turn handwheel and verify that there is as little clearance as
possible between bevel gear 1 and toothed wheel 3.
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2.5 Adjust bobbin winder
Caution: danger of injury!
Turn off the main switch.
Check and adjust bobbin winder only when the sewing unit is switched off.
Important
The bobbin winding operation must stop automatically when the bobbin
is filled up to approx. 0.3 mm below the edge of the bobbin.
Preset for bobbin winder wheel
–Loosen screws at the driver wheel 1.
–Move driver wheel 1 axially, so that the right side is 11 mm from the
left cast-iron edge.
–Tighten screws at the driver wheel 1.
The second screw in the direction of rotation is located on the
surface area.
–Put on head cover and tighten.
–Check bobbin winder and repeat adjustment, if necessary.
Note:
If the bobbin winder is open, it should not turn.
If the bobbin winder is closed, it must always turn.
Adjustment of the bobbin capacity
–Loosen screw 3.
–Adjust bobbin winder clip 4.
–Tighten screw 3.
Note:
When adjusting the driver wheel take care that afterwards the oil wicks
do not collide with the driver wheel.
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11 mm

2.6 Thread-trimmer cam
Caution: danger of injury!
Turn off the main switch.
Check and adjust thread trimmer cam only when the sewing unit is
switched off.
Note and control
The correct position of the thread trimmer cam 1 is marked by a point
on the upper shaft 2 and a line 5 on the thread trimmer cam 1.
The position is correct when both markings are opposite each other.
Engage handwheel and turn until the marking points 4 and 5 on the
upper shaft and the thread trimmer cam are visible.
Verify that both markings are exactly opposite each other.
Adjustment
–Loosen screws 3 at the thread trimmer cam.
–Twist and axially shift the thread trimmer cam in such a way that
both markings 4 and 5 are standing exactly opposite.
–Tighten screws 3.
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2.7 Sewing foot hub eccentric
Caution: danger of injury!
Turn off the main switch.
Check and adjust hub eccentric cam only when the sewing unit is
switched off.
Note and control
The correct position of the sewing foot hub eccentric 1 is marked by a
point 5 on the upper shaft 2 and a point 6 on the hub eccentric 1.
The position is correct when both markings are opposite each other
and when point 5 is half covered.
–Engage handwheel and turn until the marking points 5 and 6 on the
upper shaft and the hub eccentric are visible.
–Verify that both markings are exactly opposite each other, and that
point 5 on the shaft is half covered.
Adjustment
–Loosen screws at the adjusting ring 4.
–Loosen screws at the hub eccentric.
–Turn the hub eccentric and push axially, so that both markings 5
and 6 are exactly opposite, and only half of point 5 is visible.
–Tighten screws 3.
–Move adjusting ring 4 up to hub eccentric 1 and tighten.
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2.8 Crankshaft drive to the hook shaft
Caution: danger of injury!
Turn off the main switch.
Check and adjust crankshaft only when the sewing unit is switched off.
Note and control
The arm shaft and the hook shaft are connected by the connecting
rod 3 gripping into the crank 2 of the upper shaft.
The connecting rod 3 and the upper bearing shell 1 have a marking on
one side. When assembling them the markings must be on the same
side.
Connecting rod 3 and bearing shell 1 must not jam when screwed
together.
–Verify that the markings are on the same side.
–Tighten screws 4 equally.
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2.9 Sewing motor clutch
Caution: danger of injury!
Turn off the main switch.
Check and adjust sewing motor clutch only when the sewing unit is
switched off.
Note and control
Both clutch halves 1 and 3 must be positioned in such a way that they
abut the knobs of cam 2 on the left or right.
Rotate arm shaft with the handwheel and check whether the cam has
enough clearance in each position.
Adjustment
–Loosen screws at both clutch halves.
–Press both clutch halves together and tighten screws.
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2.10 Reference position of the sewing motor
2.10.1 Position of the initiator
Caution: danger of injury!
Turn off the main switch.
If the sewing unit is turned on, use great caution when making
adjustments and checking the initiator.
Note and control
The distance between the initiator 2 and the reference disc 3 should be
kept as small as possible.
Adjustment
–Loosen screw 1.
–Set the smallest possible distance between the initiator 2 and the
reference disc 3.
–Tighten screw 1.
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2.10.2 Adjust reference position
Caution: danger of injury!
Turn off the main switch.
Adjust the reference position only when the sewing unit is turned off.
Adjustment
–Turn on main switch.
–Move pedal back.
The reference position is established.
–Turn off the main switch.
–Loosen the screw 1 on the clutch halves 4, which are located on
the upper shaft 2.
–Hold reference disc 3.
–Turn upper shaft 2, so that the thread lever is at its upper point and
so that the marking on the 180° disc is located in front and on top.
–Tighten screw 1 at the clutch halves.
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3. Hook, looping stroke, and needle bar height
3.1 Driver shaft
Caution: danger of injury!
Turn off the main switch.
Check and adjust driver shaft only when the sewing unit is switched off.
Note and control
The driver shaft 4 should have no axial backlash, but it must also not
move sluggishly.
Check the driver shaft 4 for axial backlash and sluggishness.
Adjustment
–Unscrew screws 5 and 7 and take off oil felt pad 6.
–Loosen screws 9 (4 screws) on the motor and pull off the motor 8.
–Loosen screws at the adjusting rings 2 and 3.
–Press driver shaft 4 with toothed wheel 1 completely in the
direction of the needle bar.
–Press adjusting rings 2 and 3 against the bushing and tighten
screws.
–Check if the shaft is snug (without clearance) and runs smoothly.
–Insert motor 8 in direction of arrow, push up to top, and screw tight.
(See section 6.1)
–Tighten oil felt pad 6 with the two screws 5 and 7.
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