Adler 745-34-2 Service Manual

Manual, complete

745 - 34 - 2

Sewing unit for runstitching of piped flap

and welt pocket openings and pocket corners

Working methods: A, B, D, F

Operating Instructions

Installation Instructions

Service Instructions

Instructions for Programming DAC

Postfach 17 03 51, D-33703 Bielefeld • Potsdamer Straße 190, D-33719 Bielefeld Telefon + 49 (0) 5 21 / 9 25-00 • Telefax + 49 (0) 5 21 / 9 25 24 35 • www.duerkopp-adler.com

Ausgabe / Edition: 02/2005 Printed in Federal Republic of Germany Teile-Nr./Part.-No.: 0791 745181

745 - 34 - 2

Manual, complete

Contents

Operating Instructions

Installation Instructions

Service Instructions

Instructions for Programming DAC

Interconnection-diagram

9870 745154 B

9890 745002 B

Pneumatic circuit plan

9770 745005

Index Page:

Part 3: Service Instructions 745-34-2

1. General notes

1.1 Gauges .................................................... 6

1.2 Grooveinthearmshaftcrank ...................................... 7

2. Sewing machine head

2.1 Raising the sewing machine head .................................... 8

2.2 Removing / Installing the sewing machine head ............................ 10

2.3 Crankpinatthearmshaft......................................... 12

2.4 Needle bar linkage and disconnectable needle bars ......................... 15

2.4.1 Removing the needle bar linkage .................................... 15

2.4.2 Removing a needle bar from the linkage ................................ 17

2.4.3 Disassembly of the needle bar ...................................... 18

2.4.4 Assembly of the needle bar ........................................ 18

2.4.5 Installation of the needle bars in the needle bar linkage ....................... 19

2.4.6 Installation of the needle bar linkage .................................. 21

2.4.7 Height of the needle bar linkage ..................................... 23

2.4.8 Switch actuation point of the needle bars................................ 24

2.4.9 Aligning the needle bar linkage to the throat plate .......................... 25

2.4.10 Exchanging the needle holder ...................................... 26

2.5 Hook...................................................... 27

2.5.1 Hookshaftheight.............................................. 27

2.5.2 Adjusting the gear clearance of the hook drive ............................ 28

2.5.3 Adjusting the looping stroke........................................ 29

2.5.4 Adjusting the height of the needle holders ............................... 30

2.5.5 Adjusting the distance between hook tips and needles ....................... 32

2.5.6 Needle protection .............................................. 34

2.5.7 Exchanging the hook ............................................ 35

2.5.8 Adjusting the bobbin case holding wire ................................. 36

2.5.9 Aligning the light barriers of the bobbin thread monitor ....................... 38

2.6 Centerknife ................................................. 40

2.6.1 Removing / Installing the driving motor ................................. 40

2.6.2 Removing / Installing the switching cylinder .............................. 41

2.6.3 Adjustingtheknife ............................................. 42

2.7 Threadcontrollerspring.......................................... 44

2.8 Trimming and clamping device for the needle threads ........................ 45

2.8.1 Function ................................................... 45

2.8.2 Exchanging knife and thread catcher .................................. 47

2.9 Trimming and clamping device for the hook threads ......................... 48

2.10 Thread puller for the needle threads................................... 51

2.11 Synchronizer................................................. 52

2.12 Oillubrication................................................ 53

2.12.1 Hooklubrication............................................... 54

Index Page:

3. Transport carriage

3.1 Rearendposition.............................................. 55

3.1.1 Positionofthelimitswitchintheslottedhole ............................. 57

3.1.2 Distancebetweenswitchingscrewandlimitswitch.......................... 57

3.1.3 Stopguidefortransportcarriage..................................... 57

3.2 Changing the toothed belt ......................................... 58

3.3 Adjustingthebelttension......................................... 60

4. Feeding clamps

4.1 Measuring line for aligning the feeding clamps and the folder ................... 61

4.2 Aligning the feeding clamps as to the auxiliary line .......................... 62

4.3 Feeding clamp stroke ........................................... 63

4.4 Distance between the feeding clamps and the sole of the folder .................. 64

4.5 Front end position of the feeding clamp ................................. 66

4.6 Device for blowing the piping strip / pocket bag for 745-34-2 A/B/F ................ 67

5. Knives for corner incision

5.1 Presetting .................................................. 68

5.2 Belttension ................................................. 69

5.3 Aligningthecornerknifestationastotheseams........................... 70

5.4 Adjustingtheslantofthecornerincisions ............................... 72

5.5 Cornerknifeadjustments ......................................... 73

5.6 Exchanging the corner knives ...................................... 74

6. Laser markings

6.1 Aligningthemarkings ........................................... 76

7. Reflected light barriers for flap scanning

7.1 Swivelarm.................................................. 78

7.2 Aligningthelightbarriers ......................................... 79

7.3 Aligning the air nozzles for cleaning the reflected foil ........................ 80

8. Aligning the folding station plate as to the measuring line ................... 81

9. Positioning the sewing machine head as to the table top .................... 82

10. Fabric sliding sheet and vacuum plate

10.1 Adjustingtheheightofthevacuumplate................................ 83

10.2 Aligning the fabric sliding sheet as to the throat plate ........................ 84

11. Folder (Working method A)

11.1 Proper fastening............................................... 85

11.2 Aligning the folder as to the middle of the pocket opening...................... 86

11.3 Liftingmotionofthefolder......................................... 87

11.4 Position of the folder to the needles and to the center knife..................... 89

11.5 Aligningtheguideplatesatthefolder.................................. 90

11.6 Recognition of the folder .......................................... 91

Index Page:

12. Folders and pick-up folders ( Working methods B, D, F)

12.1 Proper fastening............................................... 93

12.2 Aligning the folder as to the middle of the pocket opening ...................... 94

12.3 Checking the position of the folder as to the needles and the center knife ............ 95

12.4 Guideplatesatthefolder......................................... 96

12.5 Lifting motion and suspension of the folder .............................. 97

12.6 Presetting the mounting plate for the pick-up folder ......................... 99

12.7 Aligningthepick-upfolder......................................... 100

12.7.1 Aligning the folder sole as to the middle of the pocket opening ................... 100

12.7.2 Adjustingtheheightofthepick-upfolderastothefolder...................... 101

12.7.3 Positionofthepick-upfolderinsewingdirection........................... 102

12.8 Adjustingtheguideplatesatthepick-upfolder............................ 103

12.9 Stopscrewforthepick-upfolder..................................... 104

12.10 Recognition of the pick-up folder..................................... 105

13. Feeding device for working method B and F

13.1 General notes ................................................ 107

13.2 Changing the toothed belt ......................................... 107

13.3 Adjustingthebelttension(WorkingmethodB) ............................ 109

13.4 Basicadjustmentoftheswivelarms(WorkingmethodB)...................... 110

13.5 Aligningandadjustingtheflapclamp(WorkingmethodB) ..................... 113

13.5.1 Aligningtheflapclampsastothepick-upfolder ........................... 113

13.5.2 Aligningtheflapclampsastothepick-upfolder ........................... 114

15.5.3 Adjustingtheflapclampliftingdevice.................................. 115

15.3.4 Adjustingtheflapclampastotheresttable.............................. 117

13.6 Flapturningdevice(WorkingmethodF) ................................ 118

13.6.1 Exchanging the toothed belt ....................................... 118

13.6.2 Basicpositionoftheturningdevice................................... 120

13.6.3 Aligning the flap turning device as to the feeding device and to the sewing level ........ 121

13.7 Sewingtestaccordingtopattern..................................... 125

14. Device for cutting the piping ends open automatically

14.1 Adjustingthepipingcutterastothepick-upfolder.......................... 128

14.2 Adjustingtheheightoftheresttable .................................. 129

14.3 Adjustingthepipingstripdeflector.................................... 130

14.4 Exchanging the piping knives ...................................... 131

14.5 Checkingtherearendpositionofthepipingknife .......................... 132

14.6 Toothedbelttension ............................................ 133

14.7 Replacingthetoothedbelt......................................... 134

15. Positioning device for working method D

15.1 General notes ................................................ 135

15.2 Aligningthefolder.............................................. 135

15.3 Aligningthepositioningdevice...................................... 136

15.4 Adjustingthepatternshiftcorrection .................................. 137

15.5 Adjustingthebutterflyvalves....................................... 138

Index Page:

15.6 Pocketbagfeed............................................... 139

15.6.1 Loading position ............................................... 139

15.6.2 Positionoftheassemblystripontheresttable............................ 140

15.6.3 Adjustingthebutterflyvalve........................................ 141

16. Adjusting the optional equipment

16.1 Downholder and pocket bag clamp ................................... 142

16.2 Waistband clamp .............................................. 143

16.3 Throw-overstacker............................................. 144

16.3.1 Adjusting the opening width ........................................ 144

16.3.2 Adjusting the height of the counter-holder ............................... 144

16.3.3 Adjusting the position of the rest sheet ................................. 144

16.3.4 Adjusting the speed of the smoothing movement ........................... 144

16.3.5 Adjustingtheheight ............................................ 146

16.4 Ejectorroller................................................. 147

16.5 Adjustingthetapefeedandtheautomaticcuttingdeviceforreinforcementstrips ....... 148

16.6 Setofparts“Pocketbagonflap”..................................... 149

16.6.1 Aligningtheflapclamps.......................................... 149

16.6.2 Adjustingtheguideplatesatthefolderandpick-upfolder ..................... 149

16.6.3 Adjustments at the feeding clamp .................................... 150

16.6.4 Fineadjustmentofthelightbarrierposition.............................. 151

16.6.5 Program“Aligningthelightbarrier” ................................... 152

16.6.6 Settingtheparameter“Pocketbag/Blowingofpipings” ...................... 152

16.6.7 Settingthemode“Pocketbagonflap” ................................. 152

16.7 Smoother................................................... 153

17. Pressure monitor ............................................. 154

18. Maintenance ................................................ 155

1. General notes

The service instruction manual on hand describes the adjustment of the sewing unit 745-34-2 in an appropriate sequence.

ATTENTION !

Some of the setting positions are interdependent. Therefore it is absolutely necessary to do the adjustment following the described order.

The operations described in the service instructions must only be executed by qualified s taff and correspondingly instructed persons respectively!

Danger of breakage !

Before the sewing unit is put into operation again after having been disassembled the necessary adjustments have to be carried out according to the service instructions.

Before any adjusting operations of parts involved in the stitch formation are made:

–

Insert a new needle without any damage.

Caution: Danger of injury !

Before repair, converting and maintenance work is done:

–

Switch off the main switch and disconnect the sewing unit from the pneumatic supply system. Exception: Adjusting operations carried out with the help of test or setting programs.

Adjusting operations and function tests when the sew ing unit is running

–

Carry out adjusting operations and function tests of the running sewing unit only under observation of all safety measures and with utmost caution.

Adjusting operations in the needle zone

–

Parts which can lead to injuries have to be removed before carrying out the adjusting operations. Exception: The parts are absolutely necessary for the adjusting operations.

1.1 Gauges

The gauges listed below allow a precise setting and testing of the sewing unit.

The locking pin 1 belongs to the standard accessories of the sewing unit. It serves to arrest the machine head in position A (looping stroke).

The setting gauges marked with *) are available on inquiry.

Position Setting gauge Order No. Use

1 Locking pin 0211 000700 Looping stroke position

2 *) Gauge 0246 002591 Crank pin to arm shaft

3 *) Gauge 0244 001001 Height of hook shaft

4 *) Measuring bridge 0212 004942 Height of needle holder

5 *) Measuring pin 0216 001070 Height of needle holder

6 *) Adjusting pin 0244 001014 Lateral hook distance

7 *) Pattern 0745 290050 Adjustment pattern

1.2 Groove in the arm shaft crank

The arm shaft crank 1 is provided with a groove 2 (5 mm).

The machine head can be locked with the locking pin through drill-hole 3. Now the machine is in looping stroke position (position A).

2. Sewing machine head

2.1 Raising the sewing machine head

For maintenance work the machine head can be raised. For this purpose the transport carriage must be in its rear position.

Caution: Danger of injury !

Switch off the main switch.

Raise the machine head only with the main switch switched off.

Raising the machine head

–

Remove covering cap 1. Lift the covering cap at the front so that the arrest is released. Lift the covering cap carefully.

–

Swivel the folding station 3 by 90°.

–

Swing the locking pin 4 upwards.

–

Lift the fabric sliding sheet 6 at the front and swing it to the left.

–

Lift the machine head in the area of head cover 5 and raise it carefully. Pawl 2 snaps in additionally. The area underneath the machine table is accessible for cleaning.

Caution: Danger of injury !

Do not reach into the table top cutout when the machine head is raised.

Swinging the machine head back

–

Hold the machine head in the area of head cover 5.

–

Release pawl 2.

–

Swing the machine head back carefully.

Attention: Danger of breakage!

Hold the machine head tight until it finally rests on.

–

Insert fabric sliding sheets

–

Swivel the locking lever 4 downwards.

–

Swing the folding station 3 back and let it catch in the locking lever.

–

Put on covering cap 1 and arrest again.

2.2 Removing / Installing the sewing machine head

For repair work or an easier change to another needle distance the machine head can be removed. For this purpose the transport carriage must be in its rear position.

Caution: Danger of injury!

Switch off the main switch and disconnect the unit from the pneumatic supply system.

Remove and install the machine head only with the main switch switched off.

1 3

13 2

12 10 11

Removing the machine head

–

Remove the covering cap 1. For this purpose lift the covering cap at the front so that the arrest is released. Lift the covering cap carefully.

–

Swivel the folding station 3 by 90°.

–

Swing the locking lever 4 upwards.

–

Lift the fabric sliding sheet 6 at the front and swing it to the left.

–

Pull off plug 12.

–

Pull off the main pneumatic hose 11 from the solenoid valve block 10.

–

Loosen the gas shock absorber connection 2. Take off the locking bow 13 with spring.

–

Unscrew screws 8 and 9.

–

Lift out the machine head carefully with an appropriate auxiliary tool.

Installing the machine head

–

Carefully insert the machine head into the cutout for the head with an appropriate auxiliary tool.

–

Screw the machine head tight with the screws 8 and 9.

–

Re-establish the gas shock absorber connection 2. Reinsert the locking bow 13 with spring.

–

Connect the pneumatic hose 11 to the solenoid valve block 10.

–

Putonplug12.

–

Insert the fabric sliding s heet.

–

Swing the locking lever 4 downwards.

–

Swing the folding station 3 back and let it catch.

–

Put on the covering cap 1 and let it catch.

2.3 Crank pin at the arm shaft

The distance between the eccentric crank pin 1 and the arm shaft 4 determines the needle bar stroke and thus the upper dead centre of the jointly and separately connectable needle bars.

ATTENTION !

The crank pin 1 is precisely set by the manufacturer! After exchanging the thread lever or if the needles do not disconnect correctly any longer, the crank pin 1 has to be readjusted.

The adjustment of the crank pin 1 is done with the gauge 7 (Order No. 0246 002591). It is not necessary to remove crank and armshaft for the adjustment.

89 8

Caution: Danger of injury !

Switch off the main switch.

Adjust the crank pin only with the main switch switched off.

–

Remove the head cover 9 after loosening the fastening screws 8.

–

Swivel the thread tension plate 10 sideways after loosening the fastening screws 11.

11 13 10

–

Remove the needle bar linkage 12 (see chapter 2.4.1).

–

Remove the switching cylinder 13 for the center knife drive (see chapter 2.6.2).

–

Detach the needle bar tie rod from the crank pin 1 after unscrewing its fastening screws (ATTENTION left-hand thread) and pull it off with the needle cage.

–

Turn the handwheel until the Allen screws 2 point downward. In this position the screws are accessible.

–

Loosen the Allen screws 2.

–

Loosen the support bolt 3. The screw is accessible through drill-hole 13.

–

Put the pivots of gauge 7 in the insertion bores 6.

–

Turn the crank pin 1 in such a way that it reaches in the cutout of the gauge.

–

Press the crank pin 1 on. The thread lever 5 must have a minimum axial backlash for the lubrication.

–

Tighten Allen screws 2 and support bolt 3.

–

Remove gauge 7.

–

Turn the handwheel and check free movement of the upper shaft.

–

Put the needle tie rod with the needle cage on the crank pin 1 and tighten the fastening screws. (ATTENTION left-hand thread).

–

Mount and adjust the needle bar linkage (see chapter 2.4.1).

–

Mount the switching cylinder for the center knife drive (see chapter 2.6.2).

2.4 Needle bar linkage and disconnectable needle bars

2.4.1 Removing the needle bar linkage

12 1

Caution: Danger of injury!

Switch off the main switch.

Remove the needle bar linkage only with the sewing unit switched off.

–

Unscrew the screws 1 and take off head cover 2.

–

Loosen the screws 3 and 5 and pull off the thread puller 4.

54 3

–

Unscrew screws 8.

–

Unscrew screw 6.

–

Loosen the counter nut 12.

–

Loosen the adjusting screw 13 a bit.

ATTENTION ! Do not loosen both adjusting screws 13.

With the two adjusting screws 13 the correct height of the linkage frame has been set by the manufacturer.

ATTENTION !

Avoid damage to the oil wick when taking off the needle bar. Note the position of the oil wick for the subsequent assembly.

–

Carefully remove the support p late 9 with the needle bar linkage 10 from the stop pin 11. This is facilitated by slight turning motions.

2.4.2 Removing a needle bar from the linkage

12 11

–

Loosen the clamping screw 1.

–

Pull out the bearing bolt 2

–

Pull off the support plate 3 from the needle bar linkage.

–

Unscrew the screws 8 and 10.

–

Remove the guide rail 9.

–

Actuate both decoupling bars 15 and push yoke 7 downwards to half the needle bar stroke.

–

Unscrew the safety bolt 6 of the clamping r ing 4 as w ell as the fastening screw 5 located below.

–

Remove the two securing halves 14. They are located in the annular slot 13 and become visible after pushing down the clamping ring 4.

–

Shift the switching block in such a way that the two decoupling bars 15 are not actuated.

–

Shift the yoke 7 slowly up the needle bar until the three upper coupling balls 12 come out.

ATTENTION !Take care that the balls do not get lost - they are

under spring pressure.

–

Pull the needle bar downward out of the linkage 16.

ATTENTION !The three lower balls 11 can drop out of the ball holes of the needle bar.

2.4.3 Disassembly of a needle bar

–

Remove the linkage 16 and the needle bar as described under 2.4.1.

–

Screw off screw 1 and unscrew the needle holder 2.

–

Unscrew screw 15 and loosen the spring counter bearing 16.

ATTENTION ! The spring counter bearing is under spring pressure. Before loosening the screw 15 support the spring counter bearing

withapinÆ 4 mm inserted in the needle bar from below.

–

Take off the parts located in the needle bar one after the other from below.

2.4.4 Assembly of a needle bar

–

Screw the locking screw 3 tightly into the needle bar.

–

Pre-assemble the lower coupling bar 17 in the sequence as per the illustration opposite.

–

Tighten nut 9 and counter-rotate the acorn nut 8 in such a way that there is a distance of 30.5 mm between the lower edge of taper socket 11 and the top edge of acorn nut 8.

Note

This dimension has to be observed in any case so that the necessary retaining force of the coupling is achieved for the needle penetration.

–

Put spring 5 and bush 6 on the thinner shaft extension of the decoupling bar 4.

–

Push the thicker shaft extension of the decoupling bar 4 into the needle bar 18 from below until it emerges on top of locking screw 3.

–

Push the following parts into the needle bar: first conical bolt 7 with the cylindrical part showing upwards, then the pre-assembled coupling bar 17 and finally spring 13 with spring 14 and spring counter bearing 16.

–

Screw the spring counter bearing 16 tight by means of screw 15.

–

Press down the decoupling bar 4 repeatedly and check whether the bars inside the needle bar are movable freely and flexibly.

2.4.5 Installation of the needle bars in the needle bar linkage

–

Insert the needle bar 7 in the linkage 1 from below.

–

Insert the needle bar in yoke 14 and clamping ring 13. The thin side of the clamping ring must point to the other needle bar and its

indentation must point upwards.

–

Push up the needle bar so that the three lower ball holes 3 are still below the linkage.

–

Insert three balls 4 in the lower ball holes 3. Use grease to avoid that the balls drop out.

–

Push the needle bar upwards so that the lower balls disappear and the upper ball holes 5 become visible.

–

Insert the three balls 6 in the upper ball holes 5.

–

Hold the needle bar tight and press the decoupling bar 2 into the needle bar.

–

Simultaneously pull the yoke 14 down half over the upper balls 6.

ATTENTION ! Now the needle bar and the yoke must not be shifted

any more because otherwise the balls being under spring pressure might come out.

–

Push the clamping ring 13 down the needle bar until the annular slot 9 lies exposed.

–

Place the two securing halves 8 in the annular slot. Push the clamping ring 13 upward as far as it will go so that the securing halves lie in the indentation.

–

Press the yoke 14 upward against the clamping ring 13 as far as it will go so that the needle bar is coupled with the yoke.

–

Screw in needle holder 11 and fasten by means of screw 12.

–

Turn the needle bar in such a way that the fronts of both needle holders are at the same level.

–

Fasten the clamping ring 13 on the needle bar. Please observe that both clamping rings 13 with their round extensions are guided in clevis 17 fastened on the yoke. After tightening the fastening screw 15 the safety bolt 16 has to be tightened, too.

–

Screw on the guide rail 19. It avoids turning of a disconnected needle bar.

ATTENTION !

When the needle bar linkage is removed and the needle bar is disconnected, the yoke 14 must not be pushed down too far. The upper balls 6 might come out unintentionally.

Note:

The precise needle height to the hook has to be adjusted after the installation of the linkage according to chapter 2.5.4 “Height of the needle holder".

2.4.6 Installation of the needle bar linkage

654

Caution: Danger of injury !

Switch off the main switch.

Mount the needle bar linkage only with the sewing unit switched off.

–

Push the support plate 4 on the needle bar linkage 5.

–

Press the bearing bolt 10 into the support plate and the needle bar linkage.

–

Tighten the clamping screw 9. The needle bar linkage must be close to the support plate 4, but must be freely movable nevertheless.

–

Carefully push the support plate 4 with the needle bar linkage 5 on the stop pin 6.

–

Insert the fastening screw 8 and tighten slightly.

–

Put the adjusting screw 3 (height of needle bar linkage) next to the stop pin 6 and secure with counter nut 7.

–

Tighten the guide plate 1 with the two screws 2.

–

Insert the needle and align the needle bar linkage as to the throat plate.

–

Tighten screws 8.

–

Check the height of the needle bar linkage (see chapter 2.4.7).

45 10

–

Push the thread puller 11 on the pins 9 and 12 and tighten with screws 10 and 13.

–

Adjust the thread puller (see chapter 2.10).

2.4.7 Adjusting the height of the needle bar linkage

12 1

Caution: Danger of injury !

Switch off the main switch.

Check and adjust the height of the needle bar linkage only with the sewing unit switched off.

Standard checking

For a safe engagement and disengagement of the needle bars the needle bar linkage must be precisely set as to the needle bars.

If the two needle bars in the upper dead centre are engaged, there must be a distance of 0.2 mm between the yoke 4 and the needle bar linkage 3.

–

Unscrew the screws 1 and take off the head cover 2.

–

Check the distance of 0.2 mm between yoke 4 and needle bar linkage 3. A feeler gauge of size 0.2 mm must be easily movable between yoke and needle bar. A feeler gauge of size 0.4 mm must jam noticeably.

Correction

–

Unscrew the screws 1 and take off the head cover 2.

–

Slightly loosen screw 5 at the support plate.

–

Loosen the counter nuts 7 and 9.

–

Set the linkage height with the screws 6 and 8 in such a way that there is a distance of 0.2 mm between linkage 3 and yoke 4.

–

Tighten the counter nuts 7 and 9.

–

Tighten screw 5 at the support plate.

–

Mount the head cover again.

9876

2.4.8 Adjusting the switch actuation point of the needle bars

12 1

Caution: Danger of injury !

Switch off the main switch.

Check and adjust the switch actuation point of the needle bars only with the sewing unit switched off.

Standard checking

The lower end position of the switching latches 3 has to be set in such a way that the needle bars disconnect safely when moving upwards.

Correction

–

Unscrew the screws 1 and take off the head cover 2.

–

Activate the adjusting program “Checking the needle and center knife engagement” (see Programming Instructions, chapter 7.3.6)

–

Press key “F5". Turn the handwheel in rotation direction until the needles engage mechanically.

–

Press key “F5". Turn the handwheel in rotation direction until the needles disengage.

–

Turn the screws 5 and 6 until the needles disengage safely.

–

Check the adjustment with test program when the machine is running (see Programming Instructions, c hapter 6.3.6).

65 43

2.4.9 Aligning the needle bar linkage to the throat plate

Caution: Danger of injury !

Switch off the main switch.

Check and adjust the alignment of the needle bar linkage only with the sewing unit switched off.

Standard checking

The needles should penetrate in the centre of the holes of throat plate 3.

–

Insert new needles.

–

Slowly move the needle bars down by handwheel.

–

Check the position of the needles in the needle hole.

Correction

–

Loosen the screws 2.

–

Shift the needle bar linkage laterally in such a way that the needles are in the centre of the needle holes.

–

Tighten the screws 2.

2.4.10 Exchanging the needle holder

Caution: Danger of injury !

Switch off the main switch.

Check and exchange the needle holder only with the sewing unit switched off.

ATTENTION !

For changing a needle holder the needle bar in question must be in position “down”. The other needle bar has to be disconnected.

–

Loosen the screw 3.

–

Remove the needle from needle holder 2.

–

Press down latch 1 for connection of the needle bar and hold it pressed.

–

Switch off the needle bar by turning the handwheel.

–

Keep on turning the handwheel. The actuated needle bar switches off.

–

Keep on turning the handwheel until the needle bar is in position “down”.

–

Loosen the screw 4.

–

Unscrew the needle holder 2 from the needle bar.

–

Screw in new needle holder.

–

Adjust the height of the needle holder (see chapter 2.5.4).

–

Tighten the screw 3.

–

Check the penetration of the needle into the needle hole.

–

Check lateral distance of the needle to the hook (see chapter 2.5.5).

The exchange of the s econd needle holder is done likewise.

432

2.5 Hook

2.5.1 Adjusting the hook shaft height

123 4 65 7

Standard checking

The distance between the throat plate support 4 and the flange surface 1 of the hook shaft must amount to 17.7 mm.

The exact height of the hook shafts is set by means of gauge 3 (order number 0244 001001).

Caution: Danger of injury !

Switch off the main switch.

Check and adjust the hook shaft height only with the sewing unit switched off.

–

Remove the throat plate.

–

Remove both hooks (see chapter 2.5.7).

–

Place the gauge 3 on the throat plate support 4. The measuring bush 2 of the gauge must reach over the hook shaft journal.

–

Check whether the flange surface 1 of the hook shaft abuts on the measuring bush 2 of the gauge.

Correction

–

Swing the machine head upwards (see chapter 2.1).

–

Remove the plastic stoppers 6.

–

Loosen the screws under the plastic stoppers.

–

Loosen the screws 5.

–

Push the flange surface 1 of the hook shaft under the measuring bush 2 of the gauge. For this purpose put a screwdriver under the flange surface 1. If the hook shaft stands too high, push it downward by a slight knocking on the flange surface 1.

–

Tighten the screws under the plastic stoppers 6 in this position.

–

Push the bush 7 against the hook shaft as far as it will go.

–

Tighten the screws 5 on the surfaces of bush 7.

–

Mount hook and throat plate again ( see chapter 2.5.7).

2.5.2 Adjusting the gear clearance of the hook drive

Standard checking

The gear clearance between worm and worm wheel should be as small as possible. The free movement must, however, remain guaranteed.

The gear clearance has to be reset after every adjustment of the hook drive in axial direction (alteration of the needle distance).

Caution: Danger of injury !

Switch off the main switch.

Check and adjust the gear clearance only with the sewing unit switched off.

–

Check the gear clearance while turning the hook slightly.

Correction

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Loosen screw 6.

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Loosen screw 1 slightly.

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Loosen the clamping screws of the worm wheel 4 slightly.

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Shift the worm wheel 4 axially. The distance between the worm wheel 4 and the inner side of the hook case must amount to 0.3 mm. At the right hook case the distance must be on the right of the worm wheel and at the left hook case on the left of the worm wheel.

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Measure the distance with a feeler gauge.

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Adjust the gear clearance by turning the eccentric bush 5. The gear clearance between worm wheel and worm should be small, but still palpable. Increase the gear clearance: Turn bush 5 upwards. Reduce the gear clearance: Turn bush 5 downwards.

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Check the looping stroke (chapter 2.5.3) and the distance between hook tip and needle (see chapter 2.5.5) and correct, if necessary.

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Tighten screws 1 and 6.

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