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102
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Troubles
Cause (1)
Cause (2)
Checking order and adjusting method
Use the ellipse needle hole guide for seat belt.
Attach the needle with the long groove orienting to the right by
approximately 20˚.
Change the feed timing using the memory switch.
After polishing scratches on the hookwith oil stone, polish it with
polishing powder. Properly adjust the clearance between the needle
and the hook.
Replace the hook with a new one.
Properly adjust the needle-to-hook timing.
Properly adjust the needle thread tension.
Properly adjust the thread take-up spring.
Properly adjust the tension controller No. 1.
Remove the scratch and polish it with buff, or replace it with a new
one.
Replace the needle.
Properly adjust the thread take-up spring.
Properly adjust the thread take-up spring.
Install the oil shield plate.
Loop fall occurs.
Needle sways.
Scratches on the hook
Thread enters into the hook.
Scratches on the needle hole guide
Finish of needle eyelet is rough.
Thread take-up spring is maladjusted.
Thread is entangled on the moving knife
during sewing.
Feed timing is too fast.
Scratches on blade point section
A
of the
hook
Hook timing is defective.
Needle thread tension is too low.
Thread take-up spring tension is too low.
Length of the remaining needle thread is
too long.
Stroke of the thread take-up spring is too
large.
Thread take-up spring tension is too high.
Oil shield plate is not installed.
4. Thread breakage
A
Summary of Contents for LK-1941
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