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Troubles
Cause (1)
Cause (2)
Checking order and adjusting method
5. Thread comes off at the time of thread trimming
Finish of needle eyelet is rough.
Thread take-up spring is maladjusted.
Rotation of the inner hook is defective.
Thread release timing is defective.
Thread spreading section of the moving knife has
scratches.
Shuttle upper spring has scratches.
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.
Lower face of the needle hole guide has scratches.
Thread spreading timing of the moving knife is
defective.
Thread take-up spring tension is too low.
Stroke of the thread take-up spring is too large.
Thread take-up spring tension is too high.
Race face of the shuttle is clogged with thread
waste.
Oil amount is insufficient.
Thread release timing is delayed.
Rising amount of the tension disk No. 2 is small.
Thread is cut before trimming with the blade
section of the moving knife.
Thread is cut before trimming with the blade
section of the moving knife.
Thread is cut with the needle hole guide.
Replace the needle.
Properly adjust the thread take-up spring.
Properly adjust the thread take-up spring.
Remove the inner hook and remove the thread waste.
Supply oil to the shuttle components.
Properly adjust the position of the thread release notch.
Properly adjust the rising amount of the tension disk No. 2.
Paying attention to the blade section, polish with polishing powder.
Remove the scratches.
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 needle
hole guide.
Properly adjust the initial position of the thread trimmer cam and
the moving knife.
Properly adjust the thread take-up spring.
