Duerkopp Adler 271 Service Manual
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Duerkopp Adler 271 Service Manual

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Contents
Part 3: Service manual, class 271 - 275
1.
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1
Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Description and adjustment of the integral adjusting disc . . . . . . . . . . . . . . . . . . . . .
1.3
2.
2.1
Null-point adjustment (position of stitch-length regulator) . . . . . . . . . . . . . . . . . . . . .
2.2
2.3
Lift cam and feed-dog height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1
Eccentric bush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
2.5
2.6
Class 272/274: aligning the feed dog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7
Class 273/274: roller overfeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.1
Synchronisation of underfeed and roller overfeed . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.2
Distance between feed roller and needle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.3
Feed-roller lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.4
Roller pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.5
Fabric deflector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.6
Roller-overfeed belt tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.7
Replacing the feed roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.
3.1
Pressure-bar height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
3.3
Electromagnetic foot lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4
Hinged foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1
Compensating hinged foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
Upper-thread tensioner release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1
Thread take-up spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.
6.
7.
Shuttle adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1
Loop lift and distance between shuttle beak and needle . . . . . . . . . . . . . . . . . . . . . .
7.2
Shuttle-drive housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3
Bobbin-housing holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Summary of Contents for Duerkopp Adler 271

  • Page 1: Table Of Contents

    Contents Home Page: Part 3: Service manual, class 271 - 275 General ..........Gauges .
  • Page 2 Contents Page: Thread clipper ..........Control cam for timing the blade movement .

  • Page 3: General

    1. General This service manual describes the adjustment of the special sewing machine, classes 271 to 275. single-needle double-lockstitch machine with skipping underfeed single-needle double-lockstitch machine with skipping underfeed and needle feed single-needle double-lockstitch machine with skipping underfeed and intermittent roller overfeed single-needle double-lockstitch machine with skipping underfeed, needle feed and intermittent roller overfeed.

  • Page 4: Gauges

    1.1 Gauges With the adjustment gauges listed below the sewing machine can be precisely adjusted and tested. item gauge order no. gauge 0216 001069 needle-bar height class 271/273 gauge 0272 001240 needle-bar height class 272/274 adjusting pin 9301 022608 lock sewing machine in positions A - F gauge 0271 000767 needle-bar height and shuttle-drive housing...

  • Page 5: Description And Adjustment Of The Integral Adjusting Disc

    1.2 Description and adjustment of the integral adjusting disc The sewing machine can be locked in all adjustment positions with locking pin 3 and the integral adjusting disc 4 on the synchronous-belt pulley of the arm shaft. The adjusting disc has 6 notches which are marked on the handwheel by the letters A, B, C, D, E and F.

  • Page 6: Positioning The Integral Adjusting Disc With Respect To The Arm Shaft

    1.3 Positioning the integral adjusting disc with respect to the arm shaft IMPORTANT Adjustments carried out with the adjusting disc will only be correct if the disc itself has been adjusted as described below. If the arm shaft is moved, all subsequent settings must be checked and adjusted if necessary.

  • Page 7: Null Point, Feed With Fitments

    2. Null point, feed with fitments 2.1 Null-point adjustment (position of stitch-length regulator) Regulation and inspection With the stitch-length lever 4 or the adjusting wheels 5 in their null positions the feed dog and needle must not move when the handwheel is turned.

  • Page 8: Feed Halt When The Stitch-Length Regulator (Thrust Cam) Moves

    2.2 Feed halt when the stitch-length regulator (thrust cam) moves Regulation and inspection With the sewing machine locked in position B (class 271/273/275) or position E (class 272/274) and the stitch length at maximum, there must be no feed movement when the stitch-length regulator 2 is moved.

  • Page 9: Lift Cam And Feed-Dog Height

    2.3 Hub cam and feed-dog height Regulation and inspection With the sewing machine locked in position B (class 271/273/275) or position E (class 272/274) markings 3 and 6 of the lift cam 7 and the connecting rod 8 must be in line. In its highest position the feed dog should protrude by 0.9 or 1.1 mm in the region of the needle hole: 0.9 mm with a fine-toothed feed dog...
  • Page 10 Fig.: A Fig.: B Fig.: C Fig.: D...

  • Page 11: Eccentric Bush

    2.3.1 Eccentric bush Regulation and inspection Class 271/273/275 The eccentric bush 1 is adjusted at the factory so that at TDC the feed dog is parallel to the needle-plate surface. In the basic position the slit is horizontal (Fig. A). When the feed dog emerges from the needle plate its back end emerges first.

  • Page 12: Class 272/274: Synchronisation Of Needle Feed And Underfeed

    2.4 Class 272/274: synchronisation of needle feed and underfeed Regulation and inspection The needle feed and underfeed are factory-set to be equal. – Set stitch length to maximum. – Check synchronisation by turning the handwheel. Caution: danger of injury Turn off the main switch. The needle feed and underfeed may only be adjusted with the sewing machine switched off.

  • Page 13: Class 272/274: Distance Between Needle Bar And Pressure Bar

    2.5 Class 272/274: distance between needle bar and pressure bar 9 mm Regulation and inspection When the stitch regulator is at "0", the distance between the needle bar and pressure bar should be 9 mm. Caution: danger of injury Turn off the main switch. The distance may only be adjusted with the sewing machine switched off.

  • Page 14: Class 272/274: Aligning The Feed Dog

    2.6 Class 272/274: aligning the feed dog Regulation and inspection The needle should enter the centre of the feed-dog needle hole if the distance between the needle bar and pressure bar is correctly set to 9 mm. Caution: danger of injury Turn off the main switch.

  • Page 15: Class 273/274: Roller Overfeed

    2.7 Class 273/274: roller overfeed Regulation and inspection The feed roller 3 is automatically lifted when the sewing foot is raised and for bar-tacking. This function must be entered in control field 5. See setting-up instructions, section 12. The maximum feed length of the intermittent roller overfeed is 7 mm. The feed length can be adjusted independently of the underfeed with adjusting wheel 4.

  • Page 16: Synchronisation Of Underfeed And Roller Overfeed

    2.7.1 Synchronisation of underfeed and roller overfeed Caution: danger of injury Turn off the main switch. Synchronisation may only be adjusted with the sewing machine switched off. Regulation and inspection The operation of the underfeed and roller overfeed should be synchronised.

  • Page 17: Distance Between Feed Roller And Needle

    2.7.2 Distance between feed roller and needle 28,5 mm Regulation and inspection The distance between the centre of the roller and that of the needle is 28.5 mm. Where a compensating hinged foot is fitted the distance is 30 mm. IMPORTANT When the distance is reset the upper and lower end positions must also be re-adjusted (see section 2.7.3).

  • Page 18: Feed-Roller Lift

    2.7.3 Feed-roller lift Regulation and inspection In the upper end position the lifted feed roller must not touch the sewing foot. In the lower end position, after the roller has been placed on the needle plate, the link 1 must encounter elastic resistance about 1 mm before the hand-lever stop reaches its limit position.

  • Page 19: Roller Pressure

    2.7.4 Roller pressure Regulation and inspection The feed-roller pressure must be suitable for the material being sewn. IMPORTANT If the pressure has been altered the upper end position must be re-adjusted (see section 2.7.3). Caution: danger of injury Turn off the main switch. The roller pressure may only be adjusted with the sewing machine switched off.

  • Page 20: Roller-Overfeed Belt Tension

    2.7.6 Roller-overfeed belt tension 4 5 6 Regulation and inspection The tension in the synchronous belts should so be such that the step lengths are precisely transmitted. Excessive belt tension can cause heavy wear and malfunctions. Caution: danger of injury Turn off the main switch.

  • Page 21: Replacing The Feed Roller

    2.7.7 Replacing the feed roller IMPORTANT If a Vulkollan roller is replaced by a steel roller or vice versa, the lower end position must be re-adjusted (see section 2.7.3). If a steel roller is fitted, the fabric deflector must be removed. If the 15mm-wide rubber roller is being used, the broad fabric deflector (order no.: 0273 000620) must be fitted.

  • Page 22: Foot Height And Lift

    3. Foot height and lift The maximum sewing-foot lift is 12 mm for machines without a thread clipper and 7 mm for machines with a thread clipper. 3.1 Pressure-bar height Regulation and inspection Class 271/273/275 When the sole of the foot is in contact with the needle plate there should be a distance of 0.5 mm between the block 1 and the traction bracket 3.

  • Page 23: Mechanical Foot Lift

    3.2 Mechanical foot lift Regulation and inspection With the sewing foot in contact with the needle plate a small amount of free movement must be perceptible in the knee lever. Caution: danger of injury Turn off the main switch. The knee lever may only be adjusted with the sewing machine switched off.

  • Page 24: Electromagnetic Foot Lift

    3.3 Electromagnetic foot lift Regulation and inspection The armature of the lifting magnet must reach its left-hand end position when it is operated. After several years’ intensive use the dimensions of the damping disc 6 may change, as a result of which the lowering of the sewing foot becomes too slow or the magnet makes knocking noises when it operates.

  • Page 25: Hinged Foot

    3.4 Hinged foot Regulation and inspection With the hinged foot the height of the pressure bar should be such that when the foot is lowered the sole of the foot executes only a small feed movement on the needle plate before the block makes contact with the pressure bar (see page 22).

  • Page 26: Compensating Hinged Foot

    3.4.1 Compensating hinged foot Regulation and inspection With the compensating hinged foot the pressure exerted by the sole of the foot is altered by replacing the pressure springs 5. Two pairs of springs of different strengths are supplied with each foot. To alter the backstitch width to the left or right of the needle only the sole of the foot needs to be replaced.

  • Page 27: Upper-Thread Tensioner Release

    4. Upper-thread tensioner release Regulation and inspection Pressing on the axle 3 opens the tensioner by about 1 mm. Caution: danger of injury Turn off the main switch. The upper-thread tensioner release may only be adjusted with the sewing machine switched off. Adjustment –...

  • Page 28: Thread Take-Up Spring

    4.1 Thread take-up spring Regulation and inspection The thread take-up spring 1 should keep the upper thread under tension at least until the tip of the needle has penetrated the material. Caution: danger of injury Turn off the main switch. The thread take-up spring may only be adjusted with the sewing machine switched off.

  • Page 29: Bobbin Winder

    5. Bobbin winder Regulation and inspection The bobbin winder should automatically turn off when the bobbin is fully wound to a point 0.5 mm under the rim. Caution: danger of injury Turn off the main switch. The bobbin winder may only be adjusted with the sewing machine switched off.

  • Page 30: Needle-Bar Height

    6. Needle-bar height Regulation and inspection Classes 271/273/275 and 272/274 have differing needle-bar heights. Adjustment and inspection are carried out with gauges 3 and 4. Caution: danger of injury Turn off the main switch. The needle-bar height may only be adjusted with the sewing machine switched off.

  • Page 31: Shuttle Adjustments

    7. Shuttle adjustments 7.1 Loop lift and distance between shuttle beak and needle 0,1 mm Regulation and inspection The loop lift is the travel of the needle bar from BDC to the point at which the shuttle beak is at the centre of the needle. The loop lift is 1.8 mm.

  • Page 32: Shuttle-Drive Housing

    7.2 Shuttle-drive housing Caution: danger of injury Turn off the main switch. The shuttle-drive housing may only be adjusted with the sewing machine switched off. Regulation and inspection The shuttle-drive housing 4 is factory-aligned. It may only be altered in exceptional circumstances. With the shuttle-drive housing correctly aligned there must be a distance of 0.4 mm between the shuttle and the adjusting ring (see section 7.1).

  • Page 33: Bobbin-Housing Holder

    7.3 Bobbin-housing holder Regulation and inspection The bobbin-housing holder is factory-aligned. When the holder has been replaced the new holder may need to be re-aligned. Caution: danger of injury Turn off the main switch. The bobbin-housing holder may only be adjusted with the sewing machine switched off.

  • Page 34: Thread Clipper

    8. Thread clipper The control cam 4 determines the movement of the thread clippers and the timing of the blade movement. The timing thus coincides with the movement of the stitch-forming components. The thread clipper is switched on electromagnetically. 8.1 Control cam for timing the blade movement Regulation and inspection When the thread clipper is not in operation there must be a distance of 0.2 to 0.3 mm between the external diameter of the control cam 4 and...

  • Page 35: Positioning The Fixed Blade

    8.2 Positioning the fixed blade Regulation and inspection The fixed blade 3 must lie in the direction of the arrow on the screw 1 (see sketch). Sharpened blades must be aligned as described in section 7.3. Caution: danger of injury Turn off the main switch.

  • Page 36: Sharpening The Fixed Blade

    8.3 Sharpening the fixed blade 15° Regulation and inspection The cutting angle of the fixed blade 6 is 15° (see sketch). It is essential for sharpening to be carried out with a fine-grained whetstone. Caution: danger of injury Turn off the main switch. After sharpening the blade must be replaced with the sewing machine switched off.

  • Page 37: Thread-Guide Plate, Adjusting Plate

    8.4 Thread-guide plate, adjusting plate Regulation and inspection Thread-guide plate 2 is used with the small shuttle, the adjusting plate 5 with the large shuttle. The thread-guide plate 2 or adjusting plate 5 must point in the direction of the arrow on the screw 3 (see sketch). In this position the radial distance between the thread-guide plate 2 or adjusting plate 5 and the thread-drawing plate 4 of the shuttle must be 0.5 mm.

  • Page 38: Hooked Blade

    8.5 Hooked blade Regulation and inspection The hooked blade 2 must lie against the two screws 1 in the direction of the arrow. With the hooked blade in the at-rest position its tip 6 and the cutting edge 7 of the fixed blade 5 must be at the same level. During the blade movement the tip 6 of the hooked blade must be exactly beneath the tip of the triangle 3 in the thread-guide plate 4.
  • Page 39 0,1 mm...

  • Page 40: Cutting Pressure

    8.6 Cutting pressure Regulation and inspection The thread must be reliably severed with pressure as low as possible. Low cutting pressure minimises wear. Two of the thickest threads used must be severed simultaneously. Caution: danger of injury Turn off the main switch. The cutting pressure may only be adjusted with the sewing machine switched off.

  • Page 41: Class 271/272: Thread Retractor

    9. Class 271/272: thread retractor If at the start of a seam the upper thread-end is supposed to be pulled through to the underside of the material, it must not be caught between the sewing foot and the material. The thread retractor ensures that the upper thread-end hangs loosely from the eye of the needle.

  • Page 42: Class 272: Edge Cutter

    10. Class 272: edge cutter On sewing machines with this accessory the edge of the material can be cut during the sewing process. In sub-classes 272 - 640141 and 272 - 640142 it is mechanically driven. It is switched on and off by a manual lever or button. Programming the on-and-off function is described in the setting-up instructions, section 13.
  • Page 43 – Undo screw 1. – Adjust block 3. The upper blade 5 should be parallel to the lower blade 6. IMPORTANT When the block 3 is turned it should be constantly pressed upwards and brought to rest against the ledge of the blade bar 15. –...

  • Page 44: Replacing The Sewing Equipment

    10.1 Replacing the sewing equipment Regulation and inspection The fitments should be selected in the light of the desired sewing result. The feed dog, slider and foot should be replaced or adjusted as required. Caution: danger of injury Turn off the main switch. Fitments may only be replaced with the sewing machine switched off.

  • Page 45: Adjusting The Indicator Bracket

    – Adjust the guide 4. The guide must be adapted to the width of the needle plate (cutting width). – Fit new needle plate 6. – Replace screw 7 and screw 8 with centring sleeve 9. – Align needle plate. The feed dog should run in the centre of the needle-plate slits.

  • Page 46: Sharpening Or Replacing The Blades

    10.3 Sharpening or replacing the blades Regulation and inspection The blade should cut reliably with the minimum possible pressure. Caution: danger of injury Turn off the main switch. Replace the blade with the sewing machine switched off. Replacing the upper blade –...

  • Page 47: Class 271: Cross-Cutter

    11. Class 271: cross-cutter On sewing machines with this attachment an incision transverse to the direction of sewing can be made in the material at every 6th stitch. Regulation and inspection The cross-cutter should cut reliably with the minimum possible pressure.
  • Page 48 0,5 mm Adjusting the blade lift – Move the manual lever to the left. The cross-cutter is switched on. – Turn the handwheel. The roller 3 should be at the highest point of the cam disc 2. In this position there should be a distance of about 1 mm between the locknut 9 and the cover plate 10.
  • Page 49 Adjusting the cutting pressure – Undo screw 4. – Adjust bearing bush 5. The driver pin 1 of the blade lever should make intimate contact with the counter-blade. – Retighten screw 4. – Undo locknut 2. – Adjust the cutting pressure by turning the screw 3. The blade should cut reliably with the minimum possible pressure.

  • Page 50: Class 275: Differential Foot Overfeed

    12. Class 275: differential foot overfeed 12.1 Adjusting the overfeed-foot travel Sewing machines of class 275 enable an extra layer of material to be processed. Regulation and inspection If the sewing machine is in position B and a stitch length of 4 mm is set, the overfeed foot must not move when the overfeed guide is swivelled.

  • Page 51: Synchronisation Of Overfeed Foot And Feed Dog

    12.1.1 Synchronisation of overfeed foot and feed dog Regulation and inspection Set the stitch length to 4 mm for the feed dog and the overfeed foot. Turn the sewing machine on with the handwheel. During the overfeed-foot working phase the overfeed foot and feed dog must be synchronised.

  • Page 52: Adjusting The Overfeed-Foot Lift

    12.2 Adjusting the overfeed-foot lift 12.2.1 Adjusting the overfeed-foot eccentric Regulation and inspection In position E the lift cam 1 should be aligned groove-to-groove with the connecting rod. Caution: danger of injury Turn off the main switch. The lift may only be adjusted with the sewing machine switched off. Adjustment –...

  • Page 53: Adjusting The Overfeed Lift Height

    12.2.2 Adjusting the overfeed lift height Regulation and inspection The overfeed foot has a maximum lift of 2 mm. In position E the distance between the foot-attachment block 5 and the bearing block 4 of the rocker lever 2 is 71 mm. Caution: danger of injury Turn off the main switch.

  • Page 54: Position Of The Overfeed Foot

    12.2.3 Position of the overfeed foot Regulation and inspection The overfeed foot is adjusted at the factory so that light and medium-weight material is laid on the feed dog in parallel. The lay (inclination) can be altered to suit the material. Caution: danger of injury Turn off the main switch.

  • Page 55: Adjustment Of The Extra-Thickness Operating Lever

    12.3 Adjusting the extra-thickness operating lever Regulation and inspection If the extra-thickness indicator lever 3 has been set to 8 mm by turning the knurled knob 2, the pin 6 should be in the hole of the upper guide 7 on sheet 5.

  • Page 56: Replacing The Arm-Shaft Bearing

    13. Replacing the arm-shaft bearing Regulation and inspection The right-hand arm-shaft bearing must be replaced if the arm shaft is running stiffly. Caution: danger of injury Turn off the main switch. Replace the arm-shaft bearing with the sewing machine switched off. IMPORTANT Do not use an extractor tool When the right-hand arm-shaft bearing is removed and replaced no...

  • Page 57: Lubrication

    14. Lubrication Regulation and inspection The oil level must not fall below the "minimum" mark. Caution: danger of injury Turn off the main switch. Work on the oil-circulation system may only be carried out with the sewing machine switched off. Oil can cause skin rashes.

  • Page 58: Oil Circulation

    14.1 Oil circulation The oil passes from the oil reservoir 5 to the sump 1, from where the lubrications points in the arm and sewing-head regions are supplied with oil. The oil thrown off by the crank mechanism passes along the wick 2 to the central distributor pipe 4 for the lubrication points located under the base plate.

  • Page 59: Shuttle Lubrication

    14.2 Shuttle lubrication Caution: danger of injury If shuttle lubrication is checked with the sewing machine switched on, the utmost care must be taken. Turn off the main switch. Shuttle lubrication may only be adjusted with the sewing machine switched off. Regulation and inspection The oil quantity required for shuttle lubrication varies with the sewing yarns and material to be processed.

  • Page 60: Control And Operating Panel

    15. Control and operating panel 15.1 Control and QUICK operating panel In this service manual only the most important aspects of the control system are described. A detailed description (parameter list and description) can be found in the motor manufacturer’s detailed operating manual. 15.1.1 Changing settings To ensure that the settings are not inadvertently altered they can only be changed by gaining access to the technician level.

  • Page 61: Reset

    15.1.2 RESET RESET restores all settings to their factory-set values. – Turn off the main switch. – Push the pedal fully forwards (step 12). – Simultaneously press and hold down the "G", "F", "+" and "-" keys on the control field. –...

  • Page 62: Control And Efka Operating Panel

    15.2 Control and EFKA operating panel In this service manual only the most important aspects of the control system are described. A detailed description (parameter list and description) can be found in the motor manufacturer’s detailed operating manual. 15.2.1 Changing settings To ensure that the settings are not inadvertently altered they can only be changed on gaining access to the technician level.

  • Page 63: Reset

    4. Changing the displayed parameter value – Press the "+" key. The parameter value is increased or switched on. – Press the "-" key. The parameter value is decreased or switched off. 5. Saving a changed parameter value – Press the "E" key. The changed parameter value is saved.

  • Page 64: Maintenance

    16. Maintenance Caution: danger of injury Turn off the main switch. Maintenance may only be carried out with the sewing machine switched off. The maintenance work to be carried out daily or weekly by the sewing machine’s operating personnel (cleaning and lubrication) is described in part 1: Operating manual.

  • Page 65: Summary Of All Sewing-Machine Settings

    17. Summary of all sewing-machine settings IMPORTANT Adjustments to the sewing machine must be carried out in the order given. no.: subject section correct adjustment correction adjusting disc position on the arm In position A it must be possible to insert a Rotate synchronous- shaft pin in the crank groove.
  • Page 66 no.: subject section correct adjustment correction foot height and foot lift pressure bar class 271/273: Move pressure bar. distance of 0.5 mm between block and traction bracket if the sole of the foot is in contact with the needle plate. class 272/274: distance of 0.5 mm between block and bush if the sole of the foot is in contact...
  • Page 67 no.: subject section correct adjustment correction class 271/272: thread retractor thread retractor Lever should make contact with the disc. Adjust magnet. Retraction movement should take place without hindrance Adjust wire. class 272: edge cutter position of the blade in Adjust start of cut. Move blade holder.

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