Duerkopp Adler 743-221 Service Manual
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Also See for 743-221:
- Installation instructions manual (12 pages) ,
- Operating instructions manual (24 pages) ,
- Parts list (72 pages)
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Contents
Part 4: Service manual, class 743-221
1.
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.
2.1
Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2
Description and adjustment of integral adjusting disc . . . . . . . . . . . . . . . . . . . . . . .
2.3
Arm-shaft crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
2.5
Thread take-up spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6
Needle-bar height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7
Shuttle settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.1 Loop lift and distance between shuttle beak and needle . . . . . . . . . . . . . . . . . . . . . .
2.7.2 Shuttle-drive housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8
Bobbin-housing holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9
Light barrier of residual-thread monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10
Bobbin winder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.11
Position sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.12
Replacing the right-hand arm-shaft bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.13
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.13.1 Shuttle lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.
3.1
Thread clipper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2 Replacing the piston . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
Folding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1 Retraction of folding table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3
Transport carriage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.1 Overrun protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4
Shaping module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1 Shaping-module guide roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.2 Shaping-module pressure cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.3 Shaping-module closing movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
Maintenance unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.
Summary of adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Table of Contents
Related Manuals for Duerkopp Adler 743-221
Summary of Contents for Duerkopp Adler 743-221
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Page 1: Table Of Contents
Contents Page: Home Part 4: Service manual, class 743-221 General ..........Adjusting the upper part of the machine Gauges . -
Page 3: General
General This service manual describes the adjustment of the 743-221 model sewing machine in an expedient sequence. IMPORTANT ! Various adjustments are mutually interdependent. The adjustment process must therefore be carried out in the order given. IMPORTANT ! The activities described in this Service manual may only be carried out by specialists or by persons with appropriate training. -
Page 4: Adjusting The Upper Part Of The Machine
Adjusting the upper part of the machine Gauges With the adjustment gauges listed below the sewing machine can be precisely adjusted and tested. item adjustment order no. gauge adjusting pin 9301 022608 lock sewing machine in positions A - F gauge 0935 107077 align transport carriage, check reference point, guide... -
Page 5: Description And Adjustment Of Integral Adjusting Disc
Description and adjustment of 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 cogged-belt pulley of the arm shaft. The adjusting disc has 6 notches which are marked on the handwheel 1 by the letters A, B, C, D, E and F. -
Page 6: Arm-Shaft Crank
Arm-shaft crank Regulation and inspection The groove 4 and notch A of the adjusting disc on the cogged-belt pulley must coincide on the X - Y line. – Lock the arm shaft with a locking pin or a 5 mm Ø pin in the arm-shaft groove 4 (through hole 3). -
Page 7: Upper-Thread Tensioner Release
Upper-thread tensioner release Regulation and inspection The cylinder 2 must open the tension discs 1 by about 1 mm. When closed, the tension discs 1 must keep the upper thread securely under tension. – Turn the "program" switch to 64. –... -
Page 8: Thread Take-Up Spring
Thread take-up spring Regulation and inspection The thread take-up spring 1 must 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 9: Needle-Bar Height
Needle-bar height Regulation and inspection Adjustment and inspection are carried out with gauge 1. Caution: danger of injury Turn off the main switch. The needle-bar height may only be adjusted with the sewing machine switched off. Adjustment – Remove shaping module 2. –... - Page 10 – Place gauge 1 on the base plate. – Unscrew safety shutter and head cover. – Undo clamping screw 9. – Lock the sewing machine in position E. – Lower the needle bar 8 onto the gauge 1. The pin of gauge 1 must fully penetrate the needle bar. –...
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Page 11: Shuttle Settings
Shuttle settings 2.7.1 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 bottom dead centre to the point at which the shuttle beak is at the centre of the needle. The loop lift is 1.8 mm. -
Page 12: Shuttle-Drive Housing
2.7.2 Shuttle-drive housing 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 2.7.1). -
Page 13: Bobbin-Housing Holder
Bobbin-housing holder Regulation and inspection The bobbin-housing holder is factory-aligned. After the holder has been replaced it may be necessary to re-align the new one. The spring wire 1 must be in close contact with the bobbin-housing holder with no gaps. Half the width of the spring wire 1 must be over the retaining tab 3. -
Page 14: Light Barrier Of Residual-Thread Monitor
Light barrier of residual-thread monitor Regulation and inspection If the light barrier is properly aligned a reflection occurs when an empty bobbin is rotated. The alignment of the light barrier is carried out in program 42. Caution: danger of injury Turn off the motor safety switch. -
Page 15: Bobbin Winder
Adjusting the alignment – Clean the lenses of the light barrier 1 and the reflection surface 3 of the bobbin hub with a soft cloth. – Undo clamping screw 2. – Press the light barrier 1 into the light-barrier holders as far as it will –... -
Page 16: Position Sensor
2.11 Position sensor Regulation and inspection After sewing the upper part of the machine must move to position C of the adjusting disc. Caution: danger of injury Turn off the main switch. The light apertures may only be adjusted with the main switch turned off. - Page 17 – Check the exact second needle position C with the locking pin. – If the locking pin will not go into notch C of the adjusting disc, correct the second needle position. Adjustment – Undo both clamping screws 7 on the position-sensor ring 8. –...
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Page 18: 2.12 Replacing The Right-Hand Arm-Shaft Bearing
2.12 Replacing the right-hand arm-shaft bearing Regulation and inspection The right-hand arm-shaft bearing must be replaced if the arm shaft does not run smoothly. Caution: danger of injury Turn off the main switch. The arm-shaft bearing may only be replaced with the sewing machine switched off. -
Page 19: 2.13 Lubrication
2.13 Lubrication 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 20: 2.13.1 Shuttle Lubrication
2.13.1 Shuttle lubrication Caution: danger of injury If shuttle lubrication is checked with the sewing machine switched on, the utmost care must be taken. Oil can cause skin rashes. Avoid protracted contact with the skin. In the event of contact, thoroughly wash the affected area. Turn off the main switch. -
Page 21: Adjusting The Sewing Machine
Adjusting the sewing machine Thread clipper Regulation and inspection When the thread is being cut the moving blade must be able to move freely in the slit of the shaping module. Caution: danger of injury Turn off the main switch. The thread clipper may only be removed with the sewing machine switched off. -
Page 22: Fitting And Removing The Blades
3.1.1 Fitting and removing the blades The blades must be replaced and adjusted with the thread clipper removed. The thread must be reliably severed with the minimum possible pressure. Regulation and inspection The distance from the edge of the fixed blade 12 to the surface of the body of the clipper is 1.5 mm. - Page 23 Fitting the blade – Screw the blade 12 onto the pressure plate 16. The distance from the edge of the blade to the surface of the body of the clipper is 1.5 mm. – Tighten screws 15 and 17. – Undo pressure screw 13.
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Page 24: Replacing The Piston
3.1.2 Replacing the piston The moving blade is raised pneumatically. The piston 4, which operates the blade, is located in the body of the clipper. Regulation and inspection When the piston is replaced it must be adjusted so that the edge of the moving blade is just beneath the edge of the fixed blade 12. -
Page 25: Folding Table
Folding table Regulation and inspection Depending on the thickness of the material the folding plate 1 should be in parallel with the slide plate at a height of between 1 and 1.5 mm above it. The height is determined by the thickness of the material. In the 0 position the leading edge of the folding plate 1 runs parallel to that of the slide plate. -
Page 26: Retraction Of Folding Table
3.2.1 Retraction of folding table The folding table is extended by a pneumatic cylinder and retracted by a tension spring. Regulation and inspection The tension in the spring must be such that with the folding table retracted the lever lies parallel to the edge of the base plate. The extension movement of the folding table must be rapid, but not instantaneous. -
Page 27: Angle Adjustment, Switch Point B03
3.2.2 Angle adjustment, switch point b03 The angle is adjusted manually. The manual grip is compressed and the angle adjusted in accordance with the scale. Regulation and inspection The angle set must be kept constant with the brake. When the table is in the forward position the proximity switch b03 must operate. -
Page 28: Transport Carriage
Transport carriage The transport carriage holds the shaping module and moves it in accordance with the seam pattern. Regulation and inspection The transport carriage must be at an angle of 90° to the arm shaft. The reference point must be adjusted with the gauge. Caution: danger of injury Turn off the main switch. -
Page 29: Overrun Protection
3.3.1 Overrun protection Regulation and inspection Overrun protection on the left of the transport carriage is provided by proximity switch b05. Caution: danger of injury Turn off the main switch. Overrun protection may only be adjusted with the sewing machine switched off. -
Page 30: Shaping Module
Shaping module 3.4.1 Shaping-module guide roller Regulation and inspection The position of the guide roller 4 is adjusted with gauges 5 and 6. The pneumatic cylinder 8 is only needed for seams with a small radius of curvature. Caution: danger of injury Turn off the main switch. -
Page 31: Shaping-Module Pressure Cylinder
3.4.2 Shaping-module pressure cylinder Regulation and inspection The pressure cylinder 3 closes the shaping module. The clamping frame 1 is supported on a shaft. The pressure cylinder 3 is free to swing. The return movement is carried out by the spring plate 7. -
Page 32: Shaping-Module Closing Movement
3.4.3 Shaping-module closing movement Regulation and inspection The closing movement for the shaping module is determined by the throttle and the closing force by the pressure regulator. The closing movement of the pressure cylinder must be rapid, but not instantaneous. The material must be properly transferred with the minimum possible pressure. -
Page 33: Adjusting The Shaping Module
3.4.4 Adjusting the shaping module 2,5 mm The sewing machine can be fitted with various shaping modules for different seam patterns. See section 2.12 of the Operating manual. Regulation and inspection The shaping module must be mounted on the support shaft with no play. -
Page 34: Maintenance Unit
Maintenance unit The maintenance unit protects the sewing machine from water and particles of dirt in order to avoid blockages and rust formation in the pneumatic system. Regulation and inspection The water level in the pressure regulator must not reach the filter. The filter insert 1 must be cleaned every 160 hours. -
Page 35: Maintenance
Maintenance Caution: danger of injury Turn off the main switch. Maintenance of the sewing machine may only be carried out when it is 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 36: Summary Of Adjustments
Summary of adjustments IMPORTANT ! Adjustments to the sewing machine must be carried out in the order given. no.: subject section correct adjustment correction arm-shaft crank position of adjusting disc groove and notch A in line rotate cogged-belt pulley upper-thread tensioner upper-thread tensioner distance of tension discs: 1mm when closed move cylinder... - Page 37 no.: subject section correct adjustment correction folding table height 1 to 1.5 mm parallel to and above slide plate add intermediate layers height is determined by thickness of material position parallel to slide plate - leading edge above align folding plate centre of needle hole and 0°...