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103
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Troubles
Cause (1)
Cause (2)
Checking order and adjusting method
Properly adjust the clearance between the needle and the hook.
Make a proper combination of the hook and the needle.
Use the ellipse needle hole guide for seat belt.
Attach the needle with the long groove orienting to the right by
approximately 20˚.
Use a ball-point needle.
Pay attention to the blade section and polish the scratch with
polishing powder.
Properly adjust the height of the counter knife.
Properly adjust the position of the counter knife.
Remove the scratches and polish with buff, or replace the needle
hole guide with a new one.
Properly adjust the initial position of the thread trimmer cam and
the moving knife.
Properly adjust the position of the moving knife.
Properly adjust the position of the thread trimmer cam.
Properly adjust the position of the moving knife.
5
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Needle thread comes off due to short
thread trimming at the time of thread
trimming.
Partial catch of needle thread loop by hook
Thread spreading section of the moving
knife has scratches.
Thread is cut before trimming with the blade
section of the moving knife. (G and H types)
Thread is cut before trimming with the blade
section of the moving knife. (G and H types)
Bottom face of the needle hole guide has
scratches.
Thread spreading timing of the moving
knife is defective.
Thread trimming timing is too fast.
(G and H types)
Double step trimming (Z type)
Clearance between the needle and the
hook is too large.
Clearance between the needle guard
section of the hook and the needle is
defective.
Fall of the loop
Needle sticking
Level difference between the needle hole
guide and the counter knife is too high.
Clearance between the needle hole guide
and the counter knife is too small.
Thread is cut with the needle hole guide.
Moving knife timing is defective.
Thread trimmer cam timing is defective.
Position of the moving knife at the time of
stop is defective.
(Short thread remains near the moving
knife.)
