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promelectroavtomat LS-2220, Service Manual

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promelectroavtomat LS-2220 Service Manual Download Page 11

- 8 -

Tension of the timing belt

Standard

• 

The belt should slacken approx. 4 - 6mm under a 2N (200g) load.

Adjustment

1. Loosen the setscrews 

 on the motor holder 

 220/240V.

2. Loosen the nuts 

 on the motor holder 120V.

3. Move the motor 

 to make adjustment.

4. Retighten the setscrews 

 and nuts 

.

www.promelectroavtomat.ru

Summary of Contents for LS-2220

Page 1: ... 2 2001 www promelectroavtomat ru ...

Page 2: ...he most up to date product specifications at the time of printing Some machine specifications may have been changed to improve the quality of the product Contact the manufacturer or your local sales representative for information on such changes Symbols used Move the part in the direction of the arrow Set the clearance as indicated Move the part to its highest or lowest position www promelectroavt...

Page 3: ...eedle down centering 5 Loop lift 6 Height of the needle bar 7 Tension of the timing belt 8 Height of the feed dogs 9 Height of the presser bar 10 Adjusting the buttonhole s left backward stitching and right forward stitching 11 Adjusting the buttonhole s right forward stitching width 12 Upper tension control dial 13 Bobbin Winding 14 Adjustment of lower thread tension 15 www promelectroavtomat ru ...

Page 4: ...sory table A Loosen and remove the screw then remove the face plate B Loosen and remove the screws then remove the front cover C Loosen and remove the screws lower the presser foot lifter then remove the rear cover D www promelectroavtomat ru ...

Page 5: ...e shuttle hook point should be 0 02 to 0 1mm Adjustment Set the pattern selection dial to 6 Turn the balance wheel to set the needle and the shuttle hook to the correct timing position Turn the needle bar supporter stud slightly to either the right or left and adjust the clearance between the needle and the shuttle hook Note The center of the needle should align with the center of the shuttle hook...

Page 6: ... race way Standard The shuttle driver should rotate smoothly no play should be felt in the race way Adjustment 1 Loosen setscrews of the driver shaft gear 2 Adjust the clearance of the driver shaft 3 Retighten the setscrews www promelectroavtomat ru ...

Page 7: ...est position to the needle plate the needle swing should be 0 15 mm or less These clearances should be on both sides of the needle plate hole Adjustment 1 Set the pattern selection dial to 4 Zigzag 2 Loosen the three set screws on the worm gear 3 Turn the worm gear to adjust the needle swing 4 Tighten the three set screws on the worm gear Note Make sure that the biting worm gear aligns with the pa...

Page 8: ...either the left or right edge of the needle plate hole Adjustment 1 Set the pattern selection dial to 4 2 Turn the balance wheel to lower the needle until it is just above the needle plate 3 Loosen the locknut for the adjusting screw on the zigzag connecting rod 4 Using a screwdriver turn the screw and adjust the needle movement range with respect to the needle plate hole 5 Tighten the locknut www...

Page 9: ...ould align with the side of the needle Adjustment 1 Set the pattern selection dial to 4 Zigzag then lower the needle to its lowest position at the left side of the needle plate 2 Loosen the set screw on the drive connecting rod 3 Raise the needle between 1 7 and 2 1 mm and align the shuttle hook point with the side of the needle 4 Tighten the set screw www promelectroavtomat ru ...

Page 10: ... 1 2 mm Adjustment 1 Set the pattern selection dial to 4 Zigzag then lower the needle to its lowest position at the right side of the needle plate 2 Turn the balance wheel until the needle contacts the shuttle hook 3 Loosen the set screw on the needle bar 4 Move the needle bar either up or down until the clearance between the top of the needle eye and the shuttle hook point is within 0 8 and 1 2 m...

Page 11: ...hould slacken approx 4 6mm under a 2N 200g load Adjustment 1 Loosen the setscrews on the motor holder 220 240V 2 Loosen the nuts on the motor holder 120V 3 Move the motor to make adjustment 4 Retighten the setscrews and nuts www promelectroavtomat ru ...

Page 12: ...edle plate at the highest position Adjustment 1 Loosen the setscrew on the vertical feed arm 2 Loosen the fixation screw of the eccentric nut 3 Turn the eccentric nut to make adjustment 4 Retighten the fixation screw of the eccentric nut 5 Retighten the setscrew www promelectroavtomat ru ...

Page 13: ...d the needle plate should be between 6 0 and 6 5mm Adjustment 1 Raise the presser foot 2 Loosen the screw on the presser bar guide bracket 3 Adjust the height of the presser bar 4 Tighten the screw Note Check that the presser foot and feed dogs are aligned www promelectroavtomat ru ...

Page 14: ...the reverse sewing regulator shaft 4 Using a screwdriver turn the reverse sewing regulator shaft to adjustment the left backward stitching b until it feeds 35 to 45 stitches 20 mm 5 Tighten the screw 6 Set the pattern selection dial to d and sew the right side of the buttonhole Caution Satin stitch 4 will change according to the pitch length adjustment of the left backward stitching 7 Loosen the f...

Page 15: ...e needle plate and lower the presser foot onto a piece of paper 2 Set the pattern selection dial to b 3 Turn the balance wheel until the needle contacts the paper 4 Set the pattern selection dial to d 5 Turn the balance wheel until the needle contacts the paper 6 Using a screwdriver turn the adjusting screw to change the stitch width of the right side Note Turn the adjusting screw to the right to ...

Page 16: ... Remove the tension dial sheet and the stopring 2 Remove the tension dial 3 Turn the adjusting nut left or right to make adjustment 4 Remount the tension dial at zero position then the stopring and the tension dial sheet Note Cotton thread 50 should be used when adjusting the tension Do not include take up spring torque www promelectroavtomat ru ...

Page 17: ...ment 1 Loosen the set screw of the pretension slightly 2 Shift the pretension up or down until even winding is achieved 3 Retighten the set screw 4 Loosen the set screw of the bobbin presser 5 Adjust the bobbin presser until the correct amount of thread is wound 6 Retighten the set screw www promelectroavtomat ru ...

Page 18: ...hread tension 0 3 0 35N 30 35g How to check the tension Pull cotton thread 50 with tension gauge slowly 1 Set cotton thread 50 in bobbin case and pull it with tension gauge 2 Adjust the adjustment screw to tension 0 3 0 35N 30 35g www promelectroavtomat ru ...

Page 19: ...LS 2220 2720 T1010134 Printed in Taiwan www promelectroavtomat ru ...

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