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Duerkopp Adler 739-23, Maintenance Instructions Manual, Page: 27 / 44

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Duerkopp Adler 739-23 Maintenance Instructions Manual Download Page 27

2.12.7

Replacement of toothed belt

Caution! Risk of injury!

Switch off main switch !
Replace toothed belt only when the sewing machine is switched off.

–

Remove guard plates 2 and 3.

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Swivel sewing machine head to the left.

–

Remove screw 5.
The belt wheel is now loose.

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Remove belt from drive wheel 1 and belt wheel 4.

–

Install new belt.

–

Secure belt wheel 4 with screw 5 on the blade holder.

–

Replace guard plates 2 and 3.

Caution!

After a replacement of the toothed belt, the zero point of the cutter
must be re-defined (for adjustment, see chapter 2.12.8).

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Summary of Contents for 739-23

Page 1: ...re 22 2 12 3 Lubrication of blades 23 2 12 4 Resharpening of blades 24 2 12 5 Blade drive 25 2 12 6 Reference switch 26 2 12 7 Replacement of toothed belt 27 2 12 8 Edge cutter zero point 28 2 13 Wind...

Page 2: ...Contents Page 5 Lubrication 41 5 1 Oil circuit 42 6 Maintenance 43...

Page 3: ...cording to these instructions Prior to adjustments on the stitch producing parts Insert new needle Caution Risk of injury Prior to repairs modifications and maintenance work Switch off main switch and...

Page 4: ...t and inspection of the sewing machine No Setting gauge Order No Application 1 Gauge 0216 001069 Height of needle bar 2 Setting pin 9301 022608 Locking of sewing machine in position A F 3 Gauge 0271 0...

Page 5: ...wheel as A B C D E and F In connection with the mark 1 the letters indicate the position of the recesses at which the machine can be locked by means of pin 3 Recess A loop stroke position is deeper t...

Page 6: ...integrated in the toothed belt wheel must be aligned to line X Y Lock arm shaft with a retention pin or a 5 mm pin placed in the arm shaft groove 4 through hole 3 It must be possible to insert the re...

Page 7: ...ace measuring bridge 2 onto throat plate surface Lock machine head in setting position A The foot of the setting pin 1 must touch the measuring bridge 2 Adjustment Loosen screw 3 Move needle bar until...

Page 8: ...entre of the needle The distance between the hook tip 6 and needle must be 0 1 mm Lock machine head in setting position A Check position of hook tip to the needle Adjustment Remove throat plate Insert...

Page 9: ...the set collar 1 must be approx 0 4 mm The distance between the throat plate support and the thread tension plate 5 must be 3 7 mm Use gauge 4 order no 0271 000767 to measure these distances Adjustme...

Page 10: ...housing 7 Move hook drive housing 7 to the side There must be a distance of 0 4 mm between the hook 2 and the set collar 1 Tighten securing screws 6 of the hook drive housing 7 Check the distance from...

Page 11: ...ee drawing In the area of the holder nose 1 there is a risk of breakage exists due to the hardness Instruction and inspection The bobbin case holder is factory aligned If the holder is replaced it mig...

Page 12: ...2 8 Lubrication of hook CAUTION The 739 23 sewing machine is equipped with an oil free hook The adjusting screw 1 has thus no function 3 12 1...

Page 13: ...wing machine is switched off Instruction and inspection Press axis 1 of the needle thread tension to open it by approx 1 mm Adjustment Loosen screw 3 Move cylinder 2 If the needle thread tensioner is...

Page 14: ...rated the sewing material Thread run adjustment Loosen screw 4 Turn bushing 3 The thread tensioning spring 1 must hold the needle thread tense until the needle point has penetrated the sewing material...

Page 15: ...and 5 Insert thread scissors carefully and tighten screws 2 and 3 The hook shaped blade of the thread scissors must run at the centre of the slot in the throat plate Connect hose 1 Operational test o...

Page 16: ...2 The distance between the edge of the blade and the edge of the guide plate is 3 mm Remove pressure screw 13 Insert movable blade 6 into blade guiding plate 8 from below Test smooth running of blade...

Page 17: ...eplacing the piston ensure that the anodised layer is not damaged Remove circlip 20 CAUTION Pin 21 is under pressure Remove pin 21 pressure spring 22 and piston 23 with O ring 24 Lubricate thread surf...

Page 18: ...chine is switched off Dismantling Loosen counternuts and turn pressure screws 2 and 3 back by approx two revolutions Remove the four countersunk screws 1 and the cover plate 4 Turn belt wheel 5 until...

Page 19: ...eedle The needle must be aligned at the centre of the stitch hole of the fixed blade in all positions shown above Turn needle into stitch hole Turn blade into the positions shown above and check punct...

Page 20: ...ositions shown above the fixed blade must be in contact with the throat plate button 15 and rotate smoothly Check the position of the fixed blade in relation to the throat plate To adjust its position...

Page 21: ...t sewing material Ensure that no material is piled up in front of the press pad Align the stitch hole of the press pad 10 to the needle Tighten screws 8 Insert the movable blade 6 into the blade holde...

Page 22: ...the thickest threads Adjustment Loosen counter nuts 2 and 3 Reset cutting pressure screws Tighten cutting pressure screws until the movable blade fits closely Turn blade drive manually and check for...

Page 23: ...e blades only when the sewing machine is switched off Instruction The edge cutter must be lubricated daily with a few drops of oil Lubrication of blades Apply one drop of oil onto the pressure screws...

Page 24: ...e blades that are made in hard metal Widia diamond disc For dimensions please refer to the above drawing CAUTION The height of movable blade may not be less than 50 mm as otherwise the blade stroke ca...

Page 25: ...ade holder 3 Adjustment Unscrew face cover Turn eccentric 1 to the lowest position for the blade movement at the motor Loosen screw 2 Adjust the height of the blade bar 4 in such a way that of the mov...

Page 26: ...ection Allow for a distance of 0 5 1 0 mm between the reference switch 2 and the blade holder 3 Place blade holder 3 with the belt wheel in front of the reference switch 2 Check the distance between t...

Page 27: ...Swivel sewing machine head to the left Remove screw 5 The belt wheel is now loose Remove belt from drive wheel 1 and belt wheel 4 Install new belt Secure belt wheel 4 with screw 5 on the blade holder...

Page 28: ...hold F3 function key Switch on main switch The setting programmes are called Select setting programme 303 by means of the or key Press OK The edge cutter is moved to its initial position Press the or...

Page 29: ...ain switch Adjust winder only when the sewing machine is switched off 1 Minor adjustments of the thread windings Bend bobbin flap 1 accordingly 2 Major adjustments of the thread windings Remove bobbin...

Page 30: ...synchronizer only when the sewing machine is switched off Adjustment of settings Loosen counternut 2 Adjust distance between synchronizer 3 and the greatest outside diameter of the switching curve Di...

Page 31: ...top to the left and to the right Move the guide and measure distance again Caution Risk of injury Switch off main switch Adjust parallel alignment of the guide only when the sewing machine is switched...

Page 32: ...ts entire length Caution Risk of injury Switch off main switch Adjust guide only when the sewing machine is switched off Adjustment Loosen the four counternuts 7 on the left and right of guide 5 Adjus...

Page 33: ...ngle between the bed plate 2 and the guide 1 Caution Risk of injury Switch off main switch Adjust guide only when the sewing machine is switched off Adjustment Loosen screws 3 at the left or right ten...

Page 34: ...els Relax tension of toothed belt Loosen screws 1 and 5 at the connecting plates 2 and 6 of the toothed belts Remove toothed belts 3 and 7 from the front and rear belt wheels 4 and 8 respectively Posi...

Page 35: ...xcessive belt tension Shorter service life Running noises Consequences of insufficient belt tension Nonconforming meshing between belt teeth and wheel Skipping of teeth under load Varying stitch lengt...

Page 36: ...switched off Consequences of excessive belt tension Shorter service life Running noises Consequences of insufficient belt tension Nonconforming meshing between belt teeth and material clamp Skipping...

Page 37: ...gramming Instructions chapter 1 4 3 Dismantle sewing foot and blades Instruction and inspection When the needle is positioned by means of the setting programme 302 the needle must be exactly aligned a...

Page 38: ...f 1 10 mm The last three digits of the display indicate the distance from the initial position Or Press key 4 Press or key The needle position is moved in the selected direction and relative to the ma...

Page 39: ...ruction and inspection Screw 1 prevents the material clamp from slipping off the drive belt There must be a distance of approximately 0 5 mm between screw 1 and the material clamp Adjustment Place mat...

Page 40: ...e material it might occur that the material holder cannot or only barely be closed Insert thin material Close material clamp Check clamping force and closing pressure Insert thick material Close mater...

Page 41: ...aution The handling and disposal of mineral oils are governed by statutory regulations Dispose of the oil through the proper channels Protect the environment and ensure that no oil is spilt Adjustment...

Page 42: ...rom the crank mechanism flows via the oil wick 2 to the oil sump 3 The excess oil is pumped back into the oil tank 1 by pump 4 Caution Risk of injury Switch off main switch Carry out installations on...

Page 43: ...1 They are also listed in the following table Maintenance task to be carried out Operating hours 8 40 160 500 Sewing machine head Remove sewing dust and threads X Check oil level in the oil tank for...

Page 44: ......

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