Duerkopp Adler 281 Istruzioni operative

281

Spezialnähmaschine

Serviceanleitung

Service Instructions

Manufacturer: Dürkopp Adler Manufacturing (Shanghai) Co., Ltd.

1201 Luoshan Road, Pudong New Area, Shanghai 200135, China

Contact: Dürkopp Adler AG, PO Box 17 03 51, D-33703 Bielefeld, Potsdamerstr. 190, D-33719 Bielefeld,

Phone +49 (0) 521 9 25 00, Fax +49 (0) 521 9 25 24 35, www.duerkopp-adler.com

Manufacturer: Dürkopp Adler Manufacturing (Shanghai) Co., Ltd.

1201 Luoshan Road, Pudong New Area, Shanghai 200135, China

Contact: Dürkopp Adler AG, PO Box 17 03 51, D-33703 Bielefeld, Potsdamerstr. 190, D-33719 Bielefeld,

Phone +49 (0) 521 9 25 00, Fax +49 (0) 521 9 25 24 35, www.duerkopp-adler.com

Ausgabe / Edition: Änderungsindex Teile-Nr./Part.-No.:

01/2009 Rev. index: 00.0 PrintedinChina 0791 281641

Eigentum der Dürkopp Adler und urheberrechtlich geschützt. Jede, auch auszugsweise Wiederverwendung

dieser Inhalte ist ohne vorheriges schriftliches Einverständnis der Dürkopp Adler verboten.

Property of Dürkopp Adler and copyrighted. Reproduction or publication of the content in any manner, even in

extracts, without prior written permission of Dürkopp Adler, is prohibited.

Property of Dürkopp Adler and copyrighted. Reproduction or publication of the content in any manner, even in

extracts, without prior written permission of Dürkopp Adler, is prohibited.

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.

Contents Page:

Part 3: Service Instructions Class 281

(Edition 01/2009)

1. General

1.1 Tools and Gauges .............................................. 3

1.2 Adjustingaids................................................. 4

2. Feeding and sewing equipment

2.1 Timingofthethrusteccentric ....................................... 5

2.2 Timingoftheliftingcam........................................... 6

2.3 Feeddogheightandinclination...................................... 7

2.4 Feeddogpositionwithinthethroatplate................................. 8

2.5 Stitch length limitation ............................................ 9

2.6 Stitch length symmetry ........................................... 10

3. Sewing foot height and sewing foot lifting

3.1 Pressure-barheight............................................. 11

3.2 Mechanical sewing foot lifting ....................................... 12

3.2.1 Liftingmotionandliftedsewingfootheight ............................... 12

3.3 Electromagnetic sewing foot lifting .................................... 13

3.3.1 Sewing foot lifter solenoid position .................................... 13

3.3.2 Mounting the sewing foot lifting solenoid................................. 14

3.3.3 Replacing the shock absorbing washer of the sewing foot lifter solenoid ............. 16

3.4 Sewingfootpressure ............................................ 18

4. Thread-guiding parts

4.1 Releasing the needle thread tension ................................... 19

4.2 Threadtake-upspring............................................ 20

4.3 Thread regulator ............................................... 21

5. Needle bar height .............................................. 22

6. Hook setting

6.1 Looping stroke and distance between the hook point and needle .................. 23

6.2 Bobbin case holder.............................................. 24

7. Thread trimmer

7.1 Controlcamfortheknifemotion...................................... 25

7.1.1 Controlcamposition............................................. 25

7.1.2 Distancebetweentherollerandthreadtrimmercam ......................... 26

7.2 Hookedknife ................................................. 27

7.3 Settingthecuttingpressure ........................................ 28

Contents Page:

8. Setting the bobbin winder

8.1 Switching off the bobbin winder ...................................... 29

8.2 Winding form of the bobbin ......................................... 30

8.3 Windingtightness .............................................. 30

9. Filling up oil (gear box) .......................................... 31

10. Hook lubrication

10.1 Setting the oil quantity for the hook .................................... 33

11. Maintenance ................................................. 34

1. General

The present service instruction describes the adjustment of the special

sewing machine 281.

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 protect the machine from powering up

accidentally.

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:

The shaft of the special sewing machine 281 is 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 Tools and Gauges

Art Size Figure

Allen key

2.5

1.5

Screw driver

Flat tip 0.7 x 4,5

Flat tip 0.3 x 3

Flat tip 0.7 x 4.5

Cross tip B2 -H

Open-end wrench 10

Gauge Needle bar height

0281 801819 for needle diameter 1.62 mm

Gauge Needle bar height

0281 800300 for needle diameter 2.00 mm

Setting pin For locking the machine at position 1 - 6

9301 022608

Gauge Feed dog height / Needle bar height

0281 800290

1.2 Adjusting aids

The sewing machine can be locked in six different setting positions

with the locking pin 1 and the arresting notches 2 on the arm shaft

crank 3.

The crank has six notches which are marked on the handwheel by the

figures 1, 2, 3, 4, 5 and 6. In conjunction with marking 4 the figures

indicate the position of the notches in which the machine can be locked

with locking pin 1.

The figures simplify the finding of the arresting notches. A precise

setting can only be ensured by arresting the machine at the provided

notches.

The following items should be adjusted in the various positions:

Pos. Symb. Description

Loop stroke

Distance between the hook point and needle

Feed dog standstill when stitch-length regulator moves

feed dog height

2nd needle position (thread lever upper dead centre)

Reference position machine head / Control cam for thread trimmer

1st Needle position

Needle in lowest position

2. Feeding and sewing equipment

2.1 Timing of the thrust eccentric

Caution: Risk of injury !

Turnthemainswitchoff!

Check and set the feed standstill only when the machine is switched

off.

ATTENTION!

The thrust eccentric in the gear box 3 is already optimally set

ex factory.

The setting should preferably not be modified.

Standard checking

With the sewing machine arrested at locking position “2", there should

be no feeding movement if the reverse feed lever 2 is actuated and the

greatest stitch length is selected.

Correction

–Set the greatest stitch length at the setting wheel 1.

–Loosen the screws 5 at the lower toothed belt wheel 4.

–Turn the lower shaft accordingly.

–Fasten the screws 5 at the lower toothed belt wheel 4.

ATTENTION!

Should the lower shaft be misaligned, the following

positions must also be re-adjusted again:

lHook (see chapter 6.1)

lThread trimmer cam (see chapter 7.11)

lLifting cam (see chapter 2.2)

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