123. Settings for different speeds
Alternating lift amount
Stitch length< 6mm
6mm< Stitch length<9mm
Less than3mm
1,500rpm
1,000rpm
3~4mm
1,000rpm
1,000rpm
4~6.Smm
500rpm
500rpm
Make proper settings for different speeds accordingly. Do not surpass the standard.
24. Troubleshooting
Trouble
Possible cause
Solution
1. Damage on the rotating hook slots, 1. Polish the damaged position, thorns
1. Thread breaking (2~3mm
needle point, hook tip and needle plate with sand paper or rasp
2. Needle thread too tight
2. Weaken the needle thread tension
thread left on the cloth)
3. Collision between needle and rotating 3. Refer to 21. Timing between needle
hook
and rotating hook
4. Rotating hook oiled insufficiently
4. Adjust oil amount (7. Lubrication)
5. Needle thread too loose
5. Increase the needle thread tension
6. Thread take-up spring too rigid
6. Reduce the rigidity of take-up spring
7. Too fast or slow timing of rotating 7. Refer to 21. Timing between needle
hook and needle
and rotating hook
1. Too fast or slow timing of rotating 1. Refer to 21. Timing between needle
2. Skipped stitch
hook and needle
and rotating hook
2. Presser foot pressure too weak
2. Tighten the pressure adjusting bolt
3. Clearance between the top of needle 3. Refer to 21. Timing between needle
hole and the rotating hook tip not proper and rotating hook
4. Wrong needle
4. Replace the needle with correct one
1. Bobbin thread doesn't pass under the 1. Refer to 11. Threading the bobbin
3. Loose stitch
tension spring of the bobbin case
2. Polish with sand paper or rasp
2. Roughness on the rotating hook
3. Replace bobbin or rotating hook
3. Bobbin stop rotating
4. Increase the bobbin thread tension
4. Bobbin thread too loose
5. Reduce the bobbin thread tension
5. Bobbin thread too tight
6. Replace the needle
6. Damage of the needle point
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