DURKOPP ADLER 381 Service Instructions Manual
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DURKOPP ADLER 381 Service Instructions Manual

DURKOPP ADLER 381 Service Instructions Manual

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Contents
Service Instructions Cl. 381/382
1.
General
1.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
1.3
1.4
Position of the lower toothed belt pulley . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.
3.
Position of the needle in the stitch hole . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
Synchronism of the needle and of the lower feed . . . . . . . . . . . . . . . . . . . . . . . .
5.
6.
Aligning the feed dog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.
Position of the lifting eccentric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.
8.1
Synchronism of the lower feed and upper puller feed . . . . . . . . . . . . . . . . . . . . . . .
8.2
8.3
Puller lifting stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4
Puller pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.5
Fabric repeller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.6
Toothed belt tension of the upper puller feed . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.7
9.
Needle bar height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.
10.1
Height of the cloth presser bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.2
Foot lift, mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.3
10.4
Sewing foot power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.
11.1
Releasing the upper thread tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.2
Thread tightening spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.
13.
13.1
13.2
Bobbin case lifter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Summary of Contents for DURKOPP ADLER 381

  • Page 1: Table Of Contents

    Contents Page: Service Instructions Cl. 381/382 General Gauge set ..........Description and adjustment of the integrated adjusting disk .
  • Page 2 Contents Page: Thread cutter 14.1 Adjusting the control cam ........14.2 Adjusting the thread cutter magnet .
  • Page 3 General points The present Service Instructions 381-382 are describing the adjustment of the special sewing machine. 381-160161 Twin needle flat bed double lockstitch machine with disconnectable needles, lower feed and needle feed, electromagnetic thread cutter 381-160162 as cl. 381-160161, but additionally with an automatic electropneumatic - bartacking mechanism and electropneumatic sewing foot lift...

  • Page 4: Gauge Set

    Gauge set The following seting gauge enables a precise adjustment and checking of the sewing machine. Position Setting gauge Ref. no. Setting pin 9301 022608 Locking the tracing positions Description and adjustment of the integrated adjusting disk By means of the locking pin 3 and by the disk 1, flanged to the toothed belt pulley of the arm shaft, it is possible to lock the sewing machine in all adjustment positions.

  • Page 5: Position Of The Integrated Adjusting Disk In Relation To The Arm Shaft

    Position of the integrated adjusting disk in relation to the arm shaft NOTE! All adjustments made by the adjusting disk are only correct when the setting has been done in compliance with the rules. Following an adjustment of the arm shaft, check and, if necessary , correct all the following settings.

  • Page 6: Position Of The Lower Toothed Belt Pulley

    Position of the lower toothed belt pulley Caution: Danger of bodily injuries ! Turn off main switch. Turn off the sewing unit before positioning the lower toothed belt pulley. Rule and control The point of the first screw, seen in the direction of rotation, snaps into the groove 3 of the lower shaft.

  • Page 7: Distance Between The Needle Bar And The Cloth Presser Bar

    Distance between the needle bar and the cloth presser bar 14,3 mm Caution: Danger of bodily injuries ! Turn off main switch ! Turn off the sewing machine before correcting the distance. Rule and control When the stitch regulator stands on "0", the distance between the needle bar and the cloth presser bar should amount to 14,3 mm.

  • Page 8: Position Of The Needle In The Stitch Hole

    Position of the needle in the stitch hole Rule and control When the dist ance between the needle bar and the cloth presser bar has been set, the needle should stitch in the middle of the stitch hole. – Turn the hand wheel. –...

  • Page 9: Synchronism Of The Needle And Of The Lower Feed

    Synchronism of the needle and of the lower feed Rule and control The needle and the feed dog 1 should advance the material equally when sewing forwards or backwards, i.e. the needle and the feed dog should be well timed. The needle should not travel within the stitch hole of the feed dog..

  • Page 10: Feed Dog Height

    Feed dog height 1 2 3 4 Rule and control For ensuring a safe material feed, the feed dog 10, when being at its topmost point, should exceed the throat plate surface by 1.1 mm. The feed dog teeth should be parallel to the throat plate surface. Caution: Danger of bodily injuries ! Turn off main switch ! Turn off the sewing machine before correcting the lifting eccentric and...

  • Page 11: Aligning The Feed Dog

    Aligning the feed dog Rule and control With the stitch length being set to its maximum value, the feed dog should have the same distance to the throat plate recess at the front and at the rear, and laterally it should stand in the middle. Caution: Danger of bodily injuries ! Turn off main switch ! Turn off the sewing machine before correcting the feed dog.

  • Page 12: Position Of The Lifting Eccentric

    Position of the lifting eccentric Access to the fastening screw of the lifting eccentric Rule and control The top of the feed dog should stand 0,1 - 0,2 mm above the throat plarte surface when the point of the needle reaches the throat plate (smooth sewing / avoiding needle breakage during the bartacking action Caution: Danger of bodily injuries !

  • Page 13: Upper Puller Feed

    Upper puller feed (only in 382) Rule and control The puller 3 is lifted automatically when lifting the sewing foot and when bartacking the seam. The function must be entered on the control panel. See Installation Instructions, chapter 12. The maximum feed length of the intermittent upper puller feed amounts to 7 mm.

  • Page 14: Synchronism Of The Lower Feed And Upper Puller Feed

    Synchronism of the lower feed and of the upper puller feed Caution: Danger of bodily injuries ! Turn off main switch ! Turn off the sewing machine before correcting the synchronism. Rule and control The lower feed and the upper puller feed should be well timed. The movement of the upper feed puller should din no case end before the movement of the feed dog.

  • Page 15: Distance Between The Puller And The Needle

    Distance between the puller and the needle 28,5 mm Rule and control In case of the stitch length = "0", the distance between the middle of the puller and the middle of the needle amounts to 28,5 mm. NOTE ! When proceeding to a new adjustment of the distance, it is necesssary to readjust also the upper and the lowere end position ! (See chapter 8.3)

  • Page 16: Puller Lifting Stroke

    Puller lifting stroke Rule and control The lifting stroke amounts to 7 mm. The lifted puller should not knock against the sewing foot in the upper end position. In the lower end position, followiwng the descent of the puller onto the throat plate, the rocker 1 should still yield 0,5 to 1 mm before the stop of the hand lever reaches its end position.

  • Page 17: Puller Pressure

    Puller pressure Rule and control The puller pressure must be adapted to the material involved. NOTE ! After resetting the puller pressure proceed to a new adjustment of the upper end position ! (see puller lifter lever) Caution: Danger of bodily injuries ! Turn off main switch ! Turn off the sewing machine before correcting the puller pressure.

  • Page 18: Toothed Belt Tension Of The Upper Puller Feed

    Toothed belt tension of the upper puller feed 4 5 6 Rule and control The toothed belts should be tight enough to ensure an exact transmission of the step length. An excessive belt tension can result in an excessive wear and in function disturbances.

  • Page 19: Replacing The Puller

    Replacing the puller 1 2 3 NOTE ! When a Vulkolan puller has been replaced by a steel puller or viceversa proceed to a new adjustment of the lower end position ! (See chapter 8.3) Remove the fabric repeller before using a steel puller ! When using the 15 mm wide rubbere puller, fit the wide fabric repeller (ref.

  • Page 20: Needle Bar Height

    Needle bar height 0,1 mm Rule and control In the loop stroke position, the hook tip 2 should stand in the middle of the needle and 1.5 mm above the top of the needle eye. – Set stitch regulator on 0. –...

  • Page 21: Sewing Foot Height And Sewing Foot Lift

    Sewing foot height and sewing foot lift The maximum sewing foot lift stroke amounts to 7 mm and in locked position 4 mm. 10.1 Height of the cloth presser bar Rule and control When the foot sole rests on the throat plate, the distance between the cloth presser block 1 and the lifter lever 3 should range between 0,5 and1,0 mm.

  • Page 22: Foot Lift, Mechanical

    10.2 Foot lift, mechanical Rule and control Set the levers 1 and 6 of the knee lever lift in such a way that at the moment of lifting the free space under the sewing foot amounts to 7.0 mm. In the locked position, the free space must amount to 4.0 mm. When the sewing foot rests on the throat plate, a slight dead travel in the knee lever must be perceptible.

  • Page 23: Foot Lift, Electropneumatic (Autom. Sewing Foot Lift)

    10.3 Foot lift, electropneumatic (autom. sewing foot lift) Rule and control Set the fork head of the lifter cylinder so as to attain the desired lift stroke. With the sewing foot being lifted and with the needle bar being in its lowest position, the needle block should not interfere with the foot sole.

  • Page 24: Sewing Foot Power

    10.4 Sewing foot power Rule and control With the sewing foot being lifted and with the needle bar being in its lowest position, the needle block should not interfere with the foot sole. Adjust the required sewing foot power by the knurled nut. Correcting the sewing foot pressure –...

  • Page 25: Thread Guiding Parts

    Thread guiding parts 11.1 Releasing the upper thread tension Rule and control In the basic position of the tension plate, the anchor 3 of the tension releasing magnet 2 has a play of 0.3 mm in the axial direction. Check by moving the nuts 4 and 5 in the axial direction.

  • Page 26: Thread Tightening Spring

    11.2 Thread tightening spring Rule and control The thread tightening spring 5 should keep the upper thread and the tension at least until the point of the needle has reached the upper side of the fabric. If the upper thread is at this moment already slack, the descending needle may stitch into its own upper thread.

  • Page 27: Bobbin Winder

    Bobbin winder Rule and control The bobbin winder will stop automatically as soon as the the thread is about 0.3 mm undere the bobbin diameter. Caution: Danger of bodily injuries ! Turn off main switch. Turn off the sewing machine before correcting the bobbin winder. Correction 1.

  • Page 28: Hook Adjustments

    Hook adjustments 13.1 Loop stroke and distance of the hook tip to the needle 0,1 mm Rule and control The loop stroke is the distance covered by the needle bar from the lower dead point up to the point where the hook tip coincides with the middle of the needle.

  • Page 29: Bobbin Case Lifter

    13.2 Bobbin case lifter Caution: Danger of bodily injuries ! Turn off main switch ! Turn off the sewing machine before opening the bobbin case. Rule and control The movement of the bobbin case lifter in relation to the hook movement is determined by the eccentreic on the hook shaft..

  • Page 30: Thread Cutter

    Thread cutter The control cam 3 determines the movement of the thread cutter and the moment of the knife movement. This permits to time the movements of the stitch forming elements. The thread cutter is switched on by electromagnetic means. 14.1 Adjusting the control cam Rule and control Set the control cam in the axial direction so that, with the tripping...

  • Page 31: Adjusting The Thread Cutter Magnet

    14.2 Adjusting the thread cutter magnet Rule and control In the neutral position of the magnet 1, the play between the nut 4 on the anchor bar of the magnet and the lower plastic disk 3 should range between 0,2 and 0,3 mm. Correction –...

  • Page 32: Timing The Knife Movement

    14.4 Timing the knife movement Rule and control Lock the machine in position IV for seting the control cam. Correction – Loosen the two hexagon screws of the control cam 2. – Loosen the third hexagon screw of the control cam, but leave it under a slight pre-tension.

  • Page 33: Height Of The Hook Shaped Knife And Lateeral Distance To The Throat Plate

    14.5 Height of the hook shaped knife and lateral distance to the throat plate Rule and control The travelling hook shaped knife should pass along the outer edge of the throat plate at a distance of 0,3 to 0,4 mm. The distance between the bottom of the hook shaped knife and the top of the recess of ther bobbin case nose should range between 0,2 and 0,3 mm.

  • Page 34: Position Of The Hook Shaped Knife In Relation To The Counter Knife

    14.6 Position of the hook shaped knife in relation to the counter knife Rule and control When the swinging hook shaped knife has reached its point of inversion, the rear edge of the hook shaped knife should be flush with the cutting edge of the counbter knife.

  • Page 35: Cutting Pressure

    14.7 Cutting pressure Rule and control The knives should cut at the minimum possible pressure. The head of the setting screw of the stationary knife should always rest against the base plate. Correcting the knife pressure – Loosen the screw 3. –...

  • Page 36: Thread Clamp Pressure

    14.9 Thread clamp pressure Rule and control Set the pressure exerted by the thread clamping sheet against the rest sheet so as to ensure that the lower thread is safely caught and kept. Correction Reducing the clamping pressure – Bend the thread clamping sheet within the machine slightly upwards.

  • Page 37: Transmission Rods For The Action Of The Hook Shaped Knife

    14.10 Transmission rods for the action of the hook shaped knife Rule and control When, following the engagement of the thread cutter, the rods are moved through the cam body into the left outer position, the block 5 should be set to the left, so that it stands 3 mm from the oil collector sheet.

  • Page 38: Needle Bar Crank And Disconnectable Needle Bars

    Needle bar crank and disconnectable needle bars 15.1 Removing the needle bar crank Caution: Danger of bodily injuries! Turn off the motor protective switch before removing the needle bar crank! – Connect both needle bars. – Remove the sewing foot and the needles. –...

  • Page 39: Removing A Needle Bar From The Crank

    15.2 Removing a needle bar from the crank – Turn out the screws 6 and 8. – Remove he guide rail. – Set the tripping block 1 by the uncoupling bar 13 and push the cross head 5 in the upper position so that it can be heard when the three lowere balls 9 are jumping out.

  • Page 40: Stripping A Needle Bar

    15.3 Stripping a needle bar – Remove the crank 19 and the needle bar as described above. – Turn out the screw 2 and remove the needle holder. – Note that the spring counter bearing stands under spring pressure. – Remove the parts contained in the needle bar from below.

  • Page 41: Fitting The Needle Bars Into The Needle Bar Crank

    15.5 Fitting the needle bars into the needle bar crank – Introduce the needle bar 7 from below into the crank 10. – Introduce the needle bar in the cross head 14 and the clamping ring 13. The thin wall of the clamping ring must show up to the other needle bar and to its cavity.
  • Page 42 – Note: Set the precise needle height in relation to the hook after fitting the crank according to the chapter "Needle bar height". – Fasten the clamping ring 13 on the needle bar and, before tightening the fastening screw, ensure that the copper wire 15 rests with its inner radius properly against the needle bar;...

  • Page 43: Fitting The Needle Bar Crank

    15.6 Fitting the needle bar crank – Introduce the needle bar crank with the bearing bolt 2 into the arm so that the hook ring 1 lies play-free in the cavity of the arm. – Tighten the screw 3. – Replace the square 7.

  • Page 44: Changing The Sewing Equipment

    Changing the sewing equipment – Remove the needles. – Remove the screw 12. – Remove the needle heads 13. – Remove the sewing foot. – Remove the screw 11 and loosen the clamnping screw 10. – Remove the throat plate. –...

  • Page 45: Changing The Toothed Belt

    Changing the toothed belt Rule and control For removing the toothed belt, remove the positioner, the hand wheel and the rear arm shaft bearing through the arm hole. Correction – Remove the head cover. – Remove the needles. – Remove the bobbin winder cover. –...

  • Page 46: Lubrication

    Lubrication Caution: Danger of bodily injuries ! Oil can cause skin rashes. Avoid protracted contact with the skin. Wash thoroughly after contact. NOTE ! The handling and disposal of mineral oils are governed by legal provisions. Take used oil to an authorised acceptance point. Protect the environment.

  • Page 47: Oil Circulation

    18.1 Oil circulation The oil passes from the supply container 2 to the felt 1 in the sewing machine arm. This ensures the lubrication of the lubrication points in the arm and head area. The oil projected by the crank passes via the wick 3 to the central distribution tube 5, for ensuring the lubrication of the parts under the base plate.

  • Page 48: Hook-Drive Lubrication

    18.2 Hook-drive lubrication Classes 381 and 382 are equipped with oil free hooks. Normally they are not to be oiled. But when processing heavy-shedding materials, it could be useful to oil the hook race occasionally. – When required, give some drops of oil to oiling points 1 and 2. –...

  • Page 49: Sewing Motors

    Sewing motors For the information about the sewing motors for the classes 381 and 382 see the chapter 4 in the Installation Instructions Cl. 381 - 382. 19.1 Sewing motor control unit DA82GA For information about the the DA82GA sewing motor control unit see chapter 7 in the Opereating Instructions Cl.

  • Page 50: Maintenance

    Maintenance Caution: Danger of bodily injuries ! Turn off main switch. Turn off the sewing machine before proceeding to any maintenance work. The maintenance work to be carried by the sewing machine opereators daily or weekly (cleaning, oiling) is described under part I of the Operating Instructions.

  • Page 51: Optional Equipment

    Optional equipment 21.1 Thread wiper Mounting and correction – Remove the puller housing (only in 382). – Fasten the housing with the control magnet on the back of the arm by screws 1. – Remove bobbin winder cover. – Open the cover of the electro-distributor. –...
  • Page 52 In 382: In thisswiping position, the wiper wire rests slightly against the sewing foot. – Tighten the screw 9. – Loosen the clamping screw 3. – Trace the machine in position IV. – Displace the wiper wire so that there is enough space under the needles –...

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