Duerkopp Adler 745-26 Service Instructions Manual
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Duerkopp Adler 745-26 Service Instructions Manual

Duerkopp Adler 745-26 Service Instructions Manual

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Contents
Part 3: Service Instructions Cl. 745 - 26 / 28
1.
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.
Transport Carriage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1
Rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2
Forward End Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
Rear End Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
Timing Belt Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5
Replacing the Timing Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.
Cl. 745-28: Folder (Work Method A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1
Stroke Movement of the Folder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
3.3
3.4
Guide Plates on the Folder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
4.1
Stroke Movement of the Folder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2
4.3
4.4
Guide Plates on the Folder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5
Support Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6
Seat for the Gripping Folder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.
Cl. 745-26 u. -28: Transfer Devices for Work Method B/C . . . . . . . . . . . . . . . . . . .
6.
6.1
Setting the Swing Range of the Gripping Folder . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2
Aligning the Feed Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3
Replacing Piping Knives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4
Setting the End Positions of the Piping Knives . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.
Positioning Device for Work Method D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1
Feed for the Pocket Bags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.
Transfer Device for Work Method F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1
Base Setting of the Aligning Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2
Setting Check, Speed Regulating Valves and Safety Switch . . . . . . . . . . . . . . . . . . .
8.3
Sewing Trial to a Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4
Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.
9.1
Clearance of the Transport Clamps to the Folder Sole . . . . . . . . . . . . . . . . . . . . . . .
9.2
Stroke Height of the Transport Clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.3
Clearance of the Flap Clamps to the Slider Plate . . . . . . . . . . . . . . . . . . . . . . . . . .
10.
Reflected Light Barrier for Flap Scanning . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.
Marker Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.
Knife Brackets for Incisions at the Corners . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.1
Adjusting the Position of the Corner Incisions . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.2
Replacing Corner Knives (745-26) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.3
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  • Page 1: Table Of Contents

    Contents Page: Home Part 3: Service Instructions Cl. 745 - 26 / 28 General ..........Transport Carriage .
  • Page 2 Contents Page: Guidance and Transport of the Knife Brackets ......13.1 Rollers ..........13.2 Timing Belt Tension and Replacing the Timing Belt .

  • Page 3: General

    1. General These service instructions describe the settings of the sewing unit in a practical order. Attention! Various setting positions are interdependent. It is therefore essential that the individual settings be made in the order described. ATTENTION ! The tasks described in these service instructions may only be conducted by skilled workers or appropriately trained personnel! Risk of Breakage ! Before starting the sewing unit again after disassembly, the thus...
  • Page 4 Setting gauges The following setting gauges are available upon request: Setting gauge Order no. Application 745-26 u. -28: Gauge 246 002591 Crank pin to the arm shaft Gauge 244 001001 Hook shaft height Timing pin 211 000700 Looping stroke position Measuring bridge 212 004942 Needle holder height...

  • Page 5: Transport Carriage

    2. Transport Carriage The advance of the transport carriage occurs via a step motor. Caution Risk of Injury ! Keep hands clear of moving machine parts. 2.1 Rollers The transport carriage is guided on the support axles by ball sleeves at the left and by rollers at the right.

  • Page 6: Forward End Position

    2.2 Forward End Position The switch S25 determines the forward end position of the transport carriage. In this position the clearance x from the front edges of the forward-lying needles to the front edges 2 of the transport clamps must x = 336 mm at 180 mm sewing distance x = 376 mm at 220 mm sewing distance The switch S15 serves as a safety switch.

  • Page 7: Rear End Position

    2.3 Rear End Position The switch S17 determines the rear end position of the transport carriage. Set switch S17 so that there is still a clearance of 5 mm between the damper discs 1 and the transport carriage 2 in the rear end position. When running into the rear end position the surface 4 on the transport carriage must open the pneumatic valve 3.

  • Page 8: Timing Belt Tension

    2.4 Timing Belt Tension At the middle of the distance S it must be possible to bend in the timing belt under a test load of FV = 4.0 kg as per the illustration below. Consequences of too high a timing belt tension: –...

  • Page 9: Replacing The Timing Belt

    2.5 Replacing the Timing Belt For ease of replacement the timing belt is divided. It is held together by the timing belt clamp 3. Caution Risk of Injury ! Turn the main switch off. Replace the timing belt only with the main switch turned off. Removing the old timing belt –...

  • Page 10: Cl. 745-28: Folder (Work Method A)

    3. Cl. 745-28: Folder (Work Method A) For the unimpeded transport of the material and a flawless working of the pocket opening, the folder and the cutting tools, as well as the marker lights, must be aligned to the center of the pocket opening. The incision of the center knife is seen as the center of the pocket opening.

  • Page 11: Stroke Movement Of The Folder

    3.1 Stroke Movement of the Folder Caution Risk of Injury ! Turn the main switch off. Set the stroke movement of the folder only with the main switch turned off. With raised folder: Between the lever 13 and the underside of the curve piece 12 there must be a safety clearance of 3 mm.
  • Page 12 Setting the draw spring Set the draw spring 17 so that only so much pressure (dead weight of the folder) is exerted on the material as is required for secure sewing. The draw spring should not pull the folder out of its lower position. –...

  • Page 13: Aligning The Folder To The Center Of The Pocket Opening

    3.2 Aligning the Folder to the Center of the Pocket Opening With proper mounting the folder can be aligned from the reference line 17 to the center of the pocket opening. Dependent on the width of the folder sole 19 the dimension x can be established.

  • Page 14: Position Of The Folder To The Needles And To The Center Knife

    3.3 Position of the Folder to the Needles and the Center Knife With a properly mounted folder the following positions must exist: – In the most forward position the needles must enter into the needle holes on the folder sole unimpaired (without being deflected). –...

  • Page 15: Guide Plates On The Folder

    3.4 Guide Plates on the Folder With the needle bar link in the most forward position the edges 2 of the guide plates must extend approx. 1 mm to the back beyond the needles. The leaf springs 1 hold the guide plates down on the folder sole with a slight pressure.

  • Page 16: Cl. 745-26 And -28: Folder And Gripping Folder (Work Method B,D,F)

    4. Cl. 745-26 u. -28: Folder and Gripping Folder (Work Method B,D,F) For the unimpeded transport of the material and a flawless working of the pocket opening, the folder and the cutting tools, as well as the marker lights, must be aligned to the center of the pocket opening. The incision of the center knife is seen as the center of the pocket opening.

  • Page 17: Stroke Movement Of The Folder

    4.1 Stroke Movement of the Folder Caution Risk of Injury ! Set the stroke movement of the folder only with the main switch turned off. Check the setting with the sewing machine turned on only while exercising the greatest possible caution. The raising of the folder serves for the unimpaired positioning of the sewing piece.

  • Page 18: Aligning The Folder To The Center Of The Pocket Opening

    4.2 Aligning the Folder to the Center of the Pocket Opening With proper mounting the folder can be aligned from the reference line 1 to the center of the pocket opening. Dependent on the width of the folder sole 3 the dimension x can be established.

  • Page 19: Position Of The Folder To The Needles And To The Center Knife

    4.3 Position of the Folder to the Needles and the Center Knife With a properly mounted folder the following positions must exist: – In the most forward position the needles must enter into the needle holes on the folder sole unimpaired (without being deflected). –...

  • Page 20: Guide Plates On The Folder

    4.4 Guide Plates on the Folder With the needle bar link in the most forward position the edges 1 of the guide plates must extend approx. 1 mm to the back beyond the needles. Depending on the material thickness and whether the flap is to be positioned right or left, the height of the guide plates 2 is to be set so that the spring-mounted holder 3 can easily be lifted by the material.

  • Page 21: Support Axle

    4.5 Support Axle Prerequisite for the setting of the piping support, gripping folder and marker lights is the parallel positioning of the support axle 1 to the reference line 2. Caution Risk of Injury ! Turn the main switch off. Set the support axle only with the main switch turned off.

  • Page 22: Seat For The Gripping Folder

    4.6 Seat for the Gripping Folder After the sideways swinging in to the center of the pocket opening the clearance from the seating pin 4 to the forward-lying needles should be 228 mm and the sideways clearance to the reference line 131 mm. 131 mm Caution Risk of Injury ! Turn the main switch off.
  • Page 23 15 16 Position the seat in the direction of sewing – Loosen screws 7 and 13. – Move the bracket 9 on the axle. The clearance between stopper angle 3 and the forward-lying needles is 228 mm. – Move the set collars 8 and 10 onto the bracket 9. –...
  • Page 25 Aligning the gripping folder – Push the gripping folder until it lays onto the seating pin 2. – Tighten screw 5. – Turn the main switch on ! Activate the setting program " Checking the Gripping Folder without Transport Clamp ". Press the F3 key. The gripping folder swings into the vertical position and lowers onto the cloth slider plate.
  • Page 26 Gripper needle rows With dual piping, when the gripping folder lowers onto the placing table, both gripper needle rows should enter at the same clearance right and left of the central ridge 1. Setting with the piping seat at the left The cylinder 2 is in the forward position on the plate 5.
  • Page 27 Motion The movements, raising, lowering, swinging in and out of the gripping folder, should occur rapidly but not jerky. – Set throttles 1, 2, 3 and 4 accordingly.

  • Page 28: Cl. 745-26 U. -28: Transfer Devices For Work Method B/C

    5. Cl. 745-26 u. -28: Transfer Devices for Work Method B / C The transfer device is avaiable in 4 executions: Transfer device right 180 mm 0794 004261 Transfer device left 180 mm 0794 004241 Transfer device right and left 180 mm 0794 004281 Transfer device right and left 220 mm 0794 004291...
  • Page 29 4 : Flap clamp left 7 : Transport clamp 5 : Clamps of the flap nippers (feed device) 8 : Center of the pocket opening 6 : Slider plate Aligning the flap nippers to the slider plate – Loosen the clamping screw on the bracket 9. –...
  • Page 31 Setting the swing cylinder – Set the stop 8 to max. swing movement. – Set stopper screw 6. The fixed leg 12 of the flap nippers should not strike the gripping folder. – Set stop 7. The fixed leg 12 should lie approx. 2 mm below the placement table 10.

  • Page 33: Device For Cutting Open The Piping Ends (Work Method C, F)

    6. Device for the Cutting Open of the Piping Ends (Work Method C, F) 6.1. Setting the Swing Range of the Gripping Folder Prerequisite: The gripping folder 2 is aligned to the center of the pocket opening as described Chapter 4.2. Setting the swing range The piping knives must run in the middle groove 6 of the placement table 5 during the cutting sequence.

  • Page 34: Replacing Piping Knives

    6.3. Replacing Piping Knives Caution Risk of Injury ! When the cylinder 1 is run out the piping knives run out downward from the sole of the gripping folder. Because of the razor sharp blades a danger of cuts exists by improper use! ATTENTION Risk of Breakage! The blades 10 of the piping knives are very susceptible to sideways...

  • Page 35: Setting The End Positions Of The Piping Knives

    6.4 Setting the End Positions of the Piping Knives The end positions of the two piping knives 12 and 15 are precisely set at the factory. They must only be reset in exceptional cases (e.g. after replacing the cylinder 1 or the knife bracket 7). ATTENTION ! In order to prevent damage to the cutting mechanism, the end positions of the piping knives 12 and 15 may only be determined by...

  • Page 36: Positioning Device For Work Method D

    7. Positioning Device for Work Method D The breast selvage lying on the placing table is taken by the positioning device and positioned over the, at first, roughly aligned jacket front. This makes possible pattern-perfect alignment and a subsequent sucking-on of the jacket front by the vacuum. After the transport clamps have lowered onto the front, the breast selvage is lifted again, reversed and moved to the flap clamp.
  • Page 37 Setting the offset correction For design reasons a pattern offset occurs between the pattern-perfectly placed and the reversed breast selvage. This offset is corrected by the stroke of cylinder 8. – After the trial sewing and execution ( turning over ) of the breast selvage pocket it is essential to check its pattern.

  • Page 38: Feed For The Pocket Bags

    7.1 Feed for Pocket Bags The feed brings the pocket bags securely to the center of the pocket opening of the folder. Caution Risk of Injury ! Turn the main switch off. Set the feed only with the main switch turned off. Conduct setting work with the sewing machine running only while exercising the greatest possible caution.
  • Page 39 Setting the throttle valves – Set throttles 3 and 5. All movement should be rapid but not jerky. – Set throttle 10. The clamping movement should be rapid but not jerky.
  • Page 40 ~70mm...

  • Page 41: Transfer Device For Work Method F

    8. Transfer Device for Work Method F 8.1 Base Settings of the Aligning Device For pattern-perfect sewing of pocket openings in checked and striped goods the following rule applies: The result of the correctly positioned jacket front and the correctly aligned flap must be pattern-perfectly transferable to the reversed and ironed pocket opening by the subsequent feed and sewing sequence.
  • Page 43 Set the set collars – Set the set collars 3 and 4 and stop 6. The aligning plate 1 should lie parallel to the cloth slider plate in the lowered position. The clearance should be approx. 2 mm. Set the shock absorbers –...
  • Page 45 – Set stopper screw 3. When the flap feed is swung in during the work cycle, it lays on tight on the gripping folder. In order to avoid whipping and thus a displacement of the flap in the clamps, the flap feed must lay on forward.

  • Page 47: Setting Check, Speed Regulating Valves And Safety Switch

    8.2 Speed Regulating Valves and Safety Switch – Set the speed regulating valves. The movement of the aligning device should be rapid. Note The flap feed should not close with a jerk. Otherwise a displacement of the flap out of its position is possible. The lower clamp 3 must first have reached its upper position before the flap feed closes completely.

  • Page 48: Sewing Trial To A Pattern

    8.3 Sewing Trial to Pattern After the base settings have been made according to these service instructions the pattern-perfect setting is made with an accordingly prepared sewing piece of light-colored material. – Draw lengthwise and crosswise lines on flap 2 and the sewing piece.

  • Page 49: Error Correction

    8.4 Error Correction Flap correctly aligned but fed at an angle. Loosen screws 1 ( 2-off ). Set bracket 2 with the swing cylinder and flap clamps appropriately angled to the flap support. ATTENTION ! Check the flap support, flap stop and aligning plate and correct, if necessary.

  • Page 50: Transport Clamps And Flap Clamp

    9. Transport Clamps 9.1 Clearance of the Transport Clamps to the Folder Sole There must be a specific clearance between the outer edges 2 of the folder sole and the inner edges 1 of the transport clamps. By medium-weight ready-to-wear material it must be e.g. 1 to 1.5 mm. The clearance is necessary in order to assure uniform piping widths on both sides and an unimpaired transport of the material.

  • Page 52: Stroke Height Of The Transport Clamps

    9.2 Stroke Height of the Transport Clamps With the flap clamps closed, the raised transport clamps must pass the machine arm without striking. The clearance between the front edges of the raised transport clamps 1 and the cloth slider plate should be approx. 23 mm at the left and approx.

  • Page 53: Clearance Of The Flap Clamps To The Slider Plate

    9.3 Clearance of the Flap Clamps to the Slider Plate In order for the flap nippers (feed devices) to be able to swing in and out unimpaired, the clearance of the flap clamps to the cloth slider plate should be 40 mm. 1: Flap clamp-left 2: Clamps of the flap nippers 3: Slider plate...

  • Page 54: Reflected Light Barrier For Flap Scanning

    10. Reflected Light Barrier for Flap Scanning The recognition of the seam beginning and seam end when sewing with flap occurs via the reflected light barrier S100. Presetting: – Set the correction values for the light barrier at the seam beginning and the light barrier at the seam end to the median value 0 (see Short Description DAC Chapter 5.3).
  • Page 55 – Conduct a sewing trial. The seam beginning and seam end must lie symmetric to the flap. The first stitch should lie in front of and the last stitch behind the flap edge (see illustration a). – In case of seam sketch b) or c) loosen screws 7. –...

  • Page 56: Marker Lights

    11. Marker Lights The light markers 2 and 4 limit the sewing area. Alternatively, a 3rd marker light, which can be supplied on request, can be attached (Order no. see Table). Subclass Order no. 745-26 0794 003031 745-28B 745-28D 745-28F 745-28A 0794 022068 The multifaceted mask built into the lamp optics makes possible the...
  • Page 57 11 12 10 11 Aligning the light markers All light markers must be aligned to the cutting line (center of the pocket opening 5). The clearance between the lengthwise lines of the H-light markers and the reference line 6 must be 125 mm. –...
  • Page 58 180 - 220 Checking the precise position of the light markers Light marker 2 (seam beginning): – At the controls turn on the forward positioning point. – Show the desired seam beginning with a chalk mark on the sewing piece. –...

  • Page 59: Knife Brackets For Incisions At The Corners

    12. Knife Brackets for the Incisions at the Corners Caution Risk of Injury ! Keep hands clear of the area of the corner knives. The rapidly rising corner knives can cause serious injuries through cuts. Conduct setting work with the sewing machine running only while exercising the greatest possible caution.

  • Page 60: Adjusting The Position Of The Corner Incisions

    12.1 Adjusting the Position of the Corner Incisions – At the controls set the longest sewing distance. – Conduct a seam trial. It is a help to first iron on a piece of nonwoven fleece to the sewing piece. This makes the corner incisions plainly visible. –...
  • Page 61 Adjusting the corner incision of the knife bracket " seam beginning " The knife bracket " seam beginning " must cut in up to in front of the first stitch. – Activate the testing program " Setting the Corner Knife Adjustment ".

  • Page 62: Replacing Corner Knives (745-26)

    12.2 Replacing Corner Knives ( 745-26 ) Blunt corner knives are to be replaced by a knife set to be found in the accessories pack. Please see Chapter 1 of these service instructions for the order numbers of the corner knife sets. Caution Risk of Injury ! Turn the main switch off.

  • Page 63: Adjusting Knife Brackets For Angled Corner Incisions (745 - 28 )

    12.3 Adjusting the Knife Brackets for Angled Corner Incisions ( 745 -28 ) Caution Risk of Injury ! Keep hands clear of the area of the corner knives. The rapidly rising corner knives can cause serious injuries through cuts. Conduct setting work with the sewing machine running only while exercising the greatest possible caution.
  • Page 64 Setting the awl rod and the knife bars The setting oocurs with a gauge ( Order no. see Chapter 1, side 4 ). – Remove screws 7 and loosen 14 and 15. – Remove the clamping piece 9, corner knives and awl 6. –...
  • Page 65 Setting the forked pieces to the stopper strips The forked pieces are formed to a stop at their rear. Dependent on the set angle and left or right seam pattern, they strike at differing heights on the stopper plates 20 when the cylinder 36 is operated. –...

  • Page 66: Guidance And Transport Of The Knife Brackets

    13. Guidance and Transport of the Knife Brackets The advance of the knife bracket ( seam beginning ) occurs via a step motor. Caution Risk of Injury ! Keep hands clear of the area of moving machine parts. 13.1 Rollers The knife brackets are guided on the guide axles at the left by ball sleeves and at the right by rollers.

  • Page 67: Timing Belt Tension And Replacing The Timing Belt

    13.2 Timing Belt Tension and Replacing the Timing Belt Caution Risk of Injury ! Turn the main switch off. Replace the timing belt only with the main switch turned off. Timing Belt Tension At the middle of the distance S it must be possible to bend in the timing belt approx.

  • Page 69: Setting The Cloth Slider Plate And Feed Plate

    14. Setting the Cloth Slider Plate and Feed Plate Align the cloth slider plate 1 so that its recess has the same clearance to both sides of the needle plate elevation. The feed plate 4 must build one level with the base plate of the machine head.

  • Page 70: Machine Head

    15. Machine Head 15.1 Crank Pin on the Arm Shaft The clearance of the eccentric crank pin 1 to the arm shaft 4 determines the size of the needle bar stroke and thus the upper dead center of the commonly and separately switchable needle bars. ATTENTION ! The crank pin 1 is precisely set at the factory! After a replacing of the thread lever or when the needles no longer...
  • Page 71 – Swing the thread tension plate 8 away to the side after loosening its mounting screws. The hole in the machine arm to be found underneath is freely accessible. – Loosen the support screw 3 accessible through the hole. – Insert gauge 13 with its pins into the seating holes 6.

  • Page 72: Needle Bar Link

    15.2 Needle Bar Link For securing the seam the seam beginning and the seam end are executed with stitch condensation and seam bartacking (swinging the needle bar link) or only stitch condensation. – Activate stitch condensation or bartacking at the seam beginning and seam end at the controls.
  • Page 74 15.2.2 Switching the Needle Bars On With the cylinder 6 not operated the needle bars are switched off and arrested in the high position. The extending piston rod of the cylinder 6 operates the latch 3. The coupling in of the needle bars occurs at that moment when the the crosshead reaches its upper dead center.
  • Page 75 – Turn the handwheel until the swing lever 9 reaches its farthest swing to the back (in direction of the arrow). – Turn swing lever 9 on the shaft 11 so that the tappet 10 of the latch is still just pushed off the catch 1. –...

  • Page 76: Switching On The Needle Bars

    15.2.3 Swing Movement The swinging of the needle bar link at the seam beginning and seam end occurs via the cylinder 2. After the setting of the eccentric axle 4, the seam bartacking plus needle transport result in a swing range of approx. 3.5 mm. The slit 7 must lie in the lower semicircle of eccentric axle 4.

  • Page 78: Removing And Attaching The Needle Bar Link

    15.2.4 Removing and Attaching the Needle Bar Link Caution Risk of Injury ! Turn the main switch off. Remove or attach the needle bar link only with the main switch turned off. Removing the needle bar link – Loosen screws 8 and 11. –...
  • Page 79 – Loosen clamping screw 4 slightly. – Pull out bearing bolt 3. – Remove the mounting plate 6 from the needle bar link 15. Attaching the needle bar link – Fasten the needle bar link 15 to mounting plate 6 with bearing bolt 3.

  • Page 80: Tilting The Machine Head To The Side

    15.3 Tilting the Machine Head to the Side For maintenance work the machine head can be tilted to the side. For this the transport carriage must be in its rear end position. For work on the hook other components are also to be removed. Caution Risk of Injury ! Turn the main switch off.
  • Page 81 Establishing free space at the hook – Tilt the machine head to the side. – Swing the support 8 down. The nose 7 must be inserted into the hole on the frame. – Loosen screws 3 ( 4-off ). – Lay angle 2 with the gas-operated damper 4 down.

  • Page 82: Hook Shaft Height

    15.4 Hook Shaft Height The clearance between the needle plate support 4 and the tappet 1 of the hook shaft must be 17.7 mm. The exact height of the hook shaft is set with the gauge 3 (Order no. 0244 001001). Caution Risk of Injury ! Turn the main switch off.

  • Page 83: Play In The Hook Drive

    15.5 Play in the Hook Drive, Hook Lubrication The play between the worm and worm wheel should be as small as possible. The ease of movement must, however, remain assured. After each setting of the hook drive in the axial direction, the play in the gears must be set again.

  • Page 84: Looping Stroke

    15.6 Looping Stroke The looping stroke is the path of the needle bars from lower dead center to the point where the hook points lie at the center of the needle. The looping stroke is 2 mm. It is set with the timing pin 4 (Order no. 0211 000700). Caution Risk of Injury ! Turn the main switch off.

  • Page 85: Height Of The Needle Holders

    15.7 Height of the Needle Holders To set the needle holders 5 the needle 7 must lie over the needle hole center and in looping stroke position. The clearance from the upper edge of the eye of the needle to the hook point 8 must be 1.5 mm in this position (see sketch).
  • Page 86 Caution Risk of Injury ! Danger of injuries from cuts! When working on the needle holders 5 keep hands clear of the area of the center knife 9. – Under the needle holders 5 press the needle bar to be switched off. At the same time turn the handwheel backwards.

  • Page 87: Clearance Of The Hook Points To The Needles

    15.8 Clearance of the Hook Points to the Needles The clearance of the hook points to the needles must be 0.1 mm. It is precisely set at the factory with setting pin 5 (Order no. 0244 001014). The set clearance makes possible work with needles of the needle thicknesses Nm 90 to Nm 110.
  • Page 88 – Loosen screw 8. – Set the needle guard 7 back by turning the eccentric bolt 6. – Remove the needle from the needle holder. – Insert the setting pin 5 into the needle holder up to the stop. – Tilt the machine head up at the side.

  • Page 89: Needle Guard

    15.9 Needle Guard The needle guard 2 prevents a deflection of the needle 4 into the path of the hook point 5. Before the hook point 5 reaches the needle the needle tip must lay onto the needle guard 2. The needle should not allow itself to be pressed into the path of the hook point 5.

  • Page 90: Replacing The Hook

    15.10 Replacing the Hook Caution Risk of Injury ! Turn the main switch off. Replace the hook only with the main switch turned off. – Remove the needle plate 7 after loosening the mounting screws. – Remove the bobbin case top 6 with bobbin. –...

  • Page 91: Bobbin Case Retaining Wire

    15.11 Bobbin Case Retaining Wire Function The bobbin case retaining wire 1 holds the bobbin case top and bottom in a specific position counter to the turning motion of the hook. The needle thread loop led around the hook is pulled through between the spring-mounted retaining wire 1 and the edge 2 of the bobbin case top.
  • Page 92 13 mm Caution Risk of Injury ! Turn the main switch off. Set the bobbin case retaining wire only with the main switch turned off. – Loosen clamping screw 3 slightly. – Set retaining wire 1. Retaining wire 1 must extend 13 mm out of the plate 5. –...

  • Page 93: Aligning The Light Barriers Of The Remaining Thread Monitor

    15.12 Aligning the Light Barriers of the Remaining Thread Monitor The light barrier mountings 3 and 6 are set at the factory so that a sufficient safety clearance of 5-6 mm to the movings hooks is provided. The alignment of the reflected light barriers occurs in program P51. ATTENTION ! The remaining thread monitor is only effective when the function is activated.

  • Page 94: Center Knife

    15.13 Center Knife Caution Risk of Injury ! Turn the main switch off. Set the center knife only with the main switch turned off. Position of the center knife at lower dead center The forward edge 4 of the moving knife 3 must lie 1 mm above the cutting edge of the fixed knife at the lower dead center.
  • Page 95 Center knife movement The center knife must move counter to the needle bars. When the needles lie at their lower dead center the knife bar drive lever 1 must be at the upper dead center. – Tilt the machine head up to the side. –...
  • Page 96 Knife bar drive lever – Remove the cylinder with swing lever for the thread puller after loosening the mounting screws. – Remove the head cover after loosening the mounting screws. – Move the knife bar drive lever 8 into its lower dead center by turning the handwheel.
  • Page 97 – Move the knife bar bridge 5 into its lower dead center by turning the handwheel. Prerequisite: The piston rod of the triggering cylinder 9 must have caught in the groove 4. – Check the free movement of the knife bar bridge 5 at the link frame.

  • Page 98: Thread Controller Springs

    15.14 Thread Controller Springs Base setting The thread controller springs must hold the needle threads tensioned until the needle tips enter the material. If the needle threads are already loose when the needles enter, then there is a danger that the needles, during their downward movement, will enter into the threads.

  • Page 99: Trimming And Clamping Device For The Needle Threads

    15.15 Trimming and Clamping Device for the Needle Threads Function – After the seam end and during drawing forward of the thread the long stroke of the cylinder 1 is switched on. The thread catcher 5 lowers and takes up the needle threads. –...

  • Page 100: Trimming And Clamping Device For The Underthreads

    15.16 Trimming and Clamping Device for the Underthreads Function – After the seam end the underthreads are pulled through the thread grooves of the needle plate into the opened underthread shears 1 and underthread clamp 2 during the drawing forward of the thread. –...
  • Page 101 Caution Risk of Injury ! Turn the main switch off. Set the trimming and clamping device for the underthreads only with the main switch turned off. – Loosen screw 7. – Align the opening of the underthread shears 1 centered to the thread grooves of the needle plate.

  • Page 102: Thread Puller For The Needle Threads

    15.17 Thread Puller for the Needle Threads The thread puller 4 pulls forward a certain needle thread quantity out of the opened thread tension. The drawn-forward needle thread quantity must be large enough to meet the following conditions: – At the beginning of sewing the downward-moving needles should not pull the needle threads out of the needle thread clamp.

  • Page 103: Bobbin Winder

    15.18 Bobbin Winder The winding procedure must end automatically when the bobbin is filled up to approx. 0.5 mm in front of the edge. Caution Risk of Injury ! Turn the main switch off. Set the bobbin capacity only with the main switch turned off. Correcting the bobbin capacity –...

  • Page 104: Replacing The Needle Holders

    15.19 Replacing the Needle Holders – Step back on the left pedal. The transport carriage runs into its rear end position. Caution Risk of Injury! Turn the main switch off. Replace the needle holders only with the main switch turned off. –...
  • Page 105 – Loosen screw 2. – Screw the needle holders 3 out of the needle bar. – Screw new needle holders into the needle bar. – Set the height of the needle holder 3 (see Chapter 15.7). – Tighten screw 2. –...

  • Page 106: Setting The Optional Equipment

    16. Setting the Optional Equipment 16.1 Pull-Off Device and Bundle Clamp The pull-off device (Order no.: 0794 014001) transports the finished sewing piece out of the machine so that it hangs down on the bundle clamp (Order no.: 0794 002201). Caution Risk of Injury ! Turn the main switch off.
  • Page 107 Setting the throttle valves – Set the lowering speed of the transport rollers 2 with the one-way restrictor valves 5 and 6. The lowering movement should be rapid, but not jerky. Setting the roll speed and activation period The roll speed and the activation period of the transport rollers are set at the controls.

  • Page 108: Stacker Addition

    16.2 Stacker Addition The stacker addition (Order no.: 0794 014001) is used in combination with the throw-over stacker. This is necessary for sewing pieces which are positioned crosswise or are so short that the throw-over stacker does not catch them. The transport rollers 1 transport the small sewing pieces into the stacker opening of the throw-over stacker.

  • Page 109: Length-Controlled Feed And Trimming Device For Reinforcement Strips

    16.3 Length-Controlled Feed and Trimming Device for Reinforcement Strips The length-controlled feed and trimming device for reinforcement strips (Order no.: 0794 014301) is used e.g. when sewing inner and outer jacket pockets. Caution Risk of Injury ! Turn the main switch off. Set the feed and trimming device only with the main switch turned off.

  • Page 110: Holder, Pocket Bag And Waistband Clamp

    16.4 Holder, Pocket Bag and Waistband Clamp With this device (Order no.: 0794 001223) the fullness resulting from darts in the area of the pocket opening is smoothed and securely held. The device consists of the following components: – Holder 3 –...
  • Page 111 Setting cylinder 6 – Loosen screw 8. – Set cylinder 6. When the cylinder is extended the needles should not extend out of the waistband clamp 4. – Tighten screw 8. – Regulate the movement speed of the cylinder 6 with throttle valve 7.

  • Page 112: Throw-Over Stacker

    16.5 Throw-Over Stacker The following base settings of the throw-over stacker were made at the factory. They are to be corrected only in exceptional cases. Caution Risk of Injury ! Before all setting work turn the main switch off and disconnect the throw-over stacker from the compressed air supply.

  • Page 114: Pneumatic Quick Clamp Adjustment

    16.6 Pneumatic Quick Clamp Adjustment The pneumatic quick clamp adjustment simplifies the setting of the transport clamps by frequent changeover of the folder between single and dual piping. Sewing unit Order no. 745 - 26 0792 005941 745 - 28 0792 005981 745 - 28 0792 005941...

  • Page 116: Maintenance

    17. Maintenance Caution Risk of Injury ! Turn the main switch off. The maintenance of the sewing unit may only occur when it is switched off. The maintenance work to be conducted by the operating personnel of the sewing unit daily and weekly ( cleaning and lubricating ) is described in Part 1: Operating Instructions.

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745-28

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