Duerkopp Adler N291 Service Manual
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Contents:
General safety instructions
Service manual N291
1.
1.1
Parts of the set of gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Adjustments in the different handwheel positions . . . . . . . . . . . . . . . . . . . . . . . .
2.
2.1
Adjustment disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2
Stitch regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
Feed dog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
Needle bar frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5
Hook, needle bar, hook guard and thread sluice . . . . . . . . . . . . . . . . . . . . . . . .
2.6
Dials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7
Sewing feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8
Sewing foot lift and thread tension release . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9
Thread regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10
Check spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.11
Oil lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.12
3.
3.1
Function sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
3.3
Braking effect of the bobbin brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4
3.5
Position of the cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6
3.7
3.8
Pressure of the counter knife on the thread catcher . . . . . . . . . . . . . . . . . . . . . .
3.9
Position of the bobbin thread clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.10
3.11
Pressure of the thread pre-tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
4.1
Reference position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2
1st and 2nd position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3
5.
5.1
Changing the hook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2
Changing the PC-board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Summary of Contents for Duerkopp Adler N291

  • Page 1: Table Of Contents

    Contents: Page: General safety instructions Service manual N291 Set of gauges and handwheel positions Parts of the set of gauges ........Adjustments in the different handwheel positions .
  • Page 3: Set Of Gauges And Handwheel Positions

    1. Set of gauges and handwheel positions 1.1 Parts of the set of gauges The pin 7 of the 13-part set of gauges (parts no. 491 79991) is also incorporated in the accessories of every machine. It is thus possible to lock the handwheel in the positions A, B, C, D, E and F, even without the set of gauges.
  • Page 4: Adjustments In The Different Handwheel Positions

    1.2 Adjustments in the different handwheel positions For some adjustments the needle bar or take-up lever must be in a defined position. This position is marked by letters on the handwheel 3 and can be locked as follows: – Turn the handwheel into the position defined for the adjustment. –...
  • Page 6: Sewing Machine

    2. Sewing machine Turn off main switch! Otherwise there is danger of injury! 2.1 Adjustment disk Explanation: Correction: The positions locked with the timing pin 1 are – Move the timing belt 5 on the upper timing only correct, when the adjustment disk 4 has pulley 6 to the left until its 2 screws are been adjusted according to the rule.
  • Page 8: Stitch Regulator

    2.2 Stitch regulator Turn off main switch! Otherwise there is danger of injury! 2.2.1 Stitch regulator 0-position for the bottom 2.2.2 Stitch regulator 0-position of the top feed feed Rule: Rule: The feed dog should perform the minimum The needle and the feeding foot should perform possible feed travel, when the respective dial the minimum possible feed travel, when the has been set at the stitch length "0".
  • Page 10: Feed Dog

    2.3 Feed dog Turn off main switch! Otherwise there is danger of injury! 2.3.1 Feed dog position in the throat plate 2.3.2 Feed dog height cutout Rule: Prerequisite: At its highest point of travel the feed dog Correct distance between the feeding foot bar should extend above the throat plate by 0.5 mm.
  • Page 11 Turn off main switch! Otherwise there is danger of injury! 2.3.3 Timing of the feed dog feed travel 2.3.4 Timing of the feed dog stroke motion Rule: Rule: When the stitch regulator lever is actuated, the When the needle is at the bottom of its stroke needle bar must not move under the following the feed dog should have reached its highest conditions:...
  • Page 12: Needle Bar Frame

    2.4 Needle bar frame Turn off main switch! Otherwise there is danger of injury! 2.4.1 General information 2.4.2 Distance between the feeding foot bar and cloth presser bar – The stop screw 5 that is sealed with yellow paint and is secured with glue to prevent it from Rule: turning must rest against the inside of the arm The distance between the bars 1 and 2 should...
  • Page 14: Hook, Needle Bar, Hook Guard And Thread Sluice

    2.5 Hook, needle bar, needle guard and thread sluice Turn off main switch! Otherwise there is danger of injury! 2.5.1 Hook shaft height 2.5.2 Distance between the hook and needle Rule: Explanation: The distance between the hook shaft 1 and the The distance set at our factory using a gauge is throat plate rest should be 17.7 mm, which can suited for needles up to Nm 140.
  • Page 16 Turn off main switch! Otherwise there is danger of injury! 2.5.3 Clearance between the worm and worm 2.5.4 Loop stroke gear Explanation: Explanation: The loop stroke is the path that the needle bar This clearance must be checked or, if travels from its lower dead point up to the point necessary corrected each time that the hook where the hook point is at the centre of the...
  • Page 18 Turn off main switch! Otherwise there is danger of injury! 2.5.5 Needle bar height 2.5.6 Position of the needle guard Rule: Explanation: The height of the needle bar should be – The needle guard 1 is to prevent that the adjusted such that under the following needle touches the hook point.
  • Page 20: Dials

    2.6 Dials Turn off main switch! Otherwise there is danger of injury! 2.6.1 Adjustment range for the stitch length 2.6.2 Adjustment range of the dial 7 for the dials smaller sewing foot stroke Explanation: Explanation: The adjustment range of the two dials 3 and 4 –...
  • Page 21 11 10...
  • Page 22: Sewing Feet

    2.7 Sewing feet Turn off main switch! Otherwise there is danger of injury! 2.7.1 Foot stroke adjustment range, foot stroke timing and equalization of foot strokes Explanation: Foot stroke equalization: These 3 adjustments are dealt with in one – Lock the handwheel in position D. chapter, as the correction of one adjustment –...
  • Page 23 Foot stroke equalization: – Swing the stroke lever 8 to the left until the sliding block rests against the pin 7. – Lay a 1-mm-thick plate onto the throat plate. – Lock the handwheel in position D. Balancing: – Bring the linkage mechanism to the position for the highest foot stroke, and to lock the linkage –...
  • Page 24 Turn off main switch! Otherwise there is danger of injury! 2.7.2 Timing of the feeding foot feed travel Rule: The sewing foot must not move when the stitch regulator lever is actuated under the following conditions: – Maximum stitch length set. –...
  • Page 25: Sewing Foot Lift And Thread Tension Release

    2.8 Sewing foot lift and thread tension release Turn off main switch! Otherwise there is danger of injury! 2.8.1 Height of the lifted sewing feet or 2.8.2 Safety stop limitation of the lifting motion Explanation: Explanation: When both sewing feet have been removed, The sewing feet can be lifted by heeling the the safety stop 3 is to prevent that the sewing pedal or by actuating the knee lever.
  • Page 26 Turn off main switch! Otherwise there is danger of injury! 2.8.3 Clearance in the lifting mechanism 2.8.4 Height of the sewing feet locked in their lifted position Rule: Explanation: The clearance in the lifting mechanism should be 1 mm, when at least one of the two sewing The sewing feet can be locked in their lifted feet rests on the throat plate or the feed dog.
  • Page 27 Turn off main switch! Rule: Otherwise there is danger of injury! The thread tension must be released enough that threads with a size of 11/3 pull easily through the tension discs. 2.8.5 Thread tension release This condition is fulfilled, when the hand lever 1 can be moved slightly at the same time.
  • Page 28: Thread Regulator

    Turn off main switch! Otherwise there is danger of injury! 2.9 Thread regulator 2.10 Check spring Explanation: Rule: With the thread regulator 1 the desired seam – The tension of the spring 3 should be such that pattern can be obtained with minimum thread the tension on the needle thread is low all the tension.
  • Page 29: Oil Lubrication

    2.11 Lubrication Turn off main switch! Otherwise there is danger of injury! 2.11.1 Checking the oil level in the arm 2.11.2 Checking the oil level in the machine reservoir, and if necessary refilling oil bed reservoir, and if necessary refilling Rule: Rule: The oil level in the reservoir 1 must be between...
  • Page 30 Turn off main switch! Otherwise there is danger of injury! 2.11.3 Regulating the hook lubrication 2.11.4 Hoses at the pump Rule: The pump 5 can only operate properly, when the hose 4 leading to the oil retainer sheet is The hook should be lubricated sufficiently with connected to the connection S (suction), and a minimum of oil.
  • Page 31: Speed Limitation With Greater Sewing Foot Strokes And Stitch Lengths

    2.12 Speed limitation in the case of greater sewing foot strokes and stitch lengths 2.12.1 General information 2.12.2 LED display The maximum speed of 4,000 rpm can only be The speed up to which the machine can be reached with smaller sewing foot strokes and stitch regulated using the pedal can be seen on the 4 lengths under 6 mm.
  • Page 32: Thread Trimmer

    3. Thread trimmer Turn off main switch! Otherwise there is danger of injury! 3.1 Function sequence 3.2 Activation timing of the bobbin brake 1 When the pedal is heeled completely to actuate the trimming action: Explanation: When the thread catcher draws bobbin thread, the bobbin should be braked to prevent it from –...
  • Page 33: Position Of The Cam

    Turn off main switch! Otherwise there is danger of injury! 3.4 Position of the cam 3.5 Position of the cylinder Explanation: Rule: The cam 9 determines the motion sequence of The distance between the retracted piston rod the thread catcher and thus the timing of thread of the cylinder 6 and the element 8 should be catching and trimming.
  • Page 34: Thread Catcher Range Of Motion

    Turn off main switch! Otherwise there is danger of injury! 3.7 Thread catcher range of 3.9 Position of the bobbin thread clamp motion Explanation: Rule: During the trimming action the clamp 3 is to clamp the bobbin thread so that the needle When the thread catcher 6 has been swung thread securely carries the bobbin thread with into its home position, its point should be...
  • Page 36: Synchronizer

    4. Synchronizer 4.1 Reference position The reference position of the synchronizer is to be determined after the following steps: – Attaching the synchronizer during installation of the machine. – Changing the synchronizer. – Changing the control box. – After unscrewing the synchronizer. After the reference position has been determined, the signals for the 1st and 2nd position are given in the moments laid down by the factory.
  • Page 37: 1St And 2Nd Position

    Process Remarks / Display text (DT) – Press the key P, enter 171. – Press the key E. Turn the handwheel into the 1 needle position F. – Press the key E, enter 188. Turn off: – Press the key P, enter 182. –...
  • Page 38: Changing The Elements

    5. Changing the elements Turn off main switch! Otherwise there is danger of injury! 5.1 Changing the hook 5.2 Changing the circuit board Removing the hook: When the circuit board 5 is re-installed be sure to note the following! – Unscrew the throat plate.

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