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4-3) The tension of the needle thread Reduce the tension of the needle thread. Use silicon.
is too high.
4-4) The speed is too high. Reduce the speed.
4-5) The feed timing is inappropriate. 5-A) The needle is bent by the thick Hasten the feed timing.
(needle bent) portion.
4-6) The thread take-up spring is 6-A) The stroke of the thread take-up Shorten the stroke of the thread take-up spring.
inappropriately adjusted. spring is too long.
6-B) The tension of the thread take-up Reduce the tension of the thread take-up spring.
spring is too high.
4-7) The material is inappropriately 7-A) The presser is floating. Adjust the clearance between the presser bar holder and
stretched. lifting plate.
7-B) The needle hole of the throat Use a throat plate with a smaller needle hole.
plate is too large.
7-C) The thread relief on the back Use a foot with a smaller thread relief on the backside or
side of the presser is too large. without thread relief.
7-D) The parallel level of the presser Replace the presser, or loosen the presser bar holding
is inappropriate. screw and correct the foot bend.
5. Needle thread breakage 5-1) The thread path (including the 1-A) The thread path is not smooth. Finish the thread path appropriately.
throat plate and foot) is defective
1-B) The thread path has a flaw. Finish the thread path appropriately.
1-C) The thread path has an obstacle. Check threading again and conduct correction if necessary.
5-2) The tension of the needle thread 2-A) The tension of the needle thread Adjust the tension of the needle thread to the appropriate
is inappropriate. is too high or too low. level.
2-B) The 1st thread tension is too low. Adjust the tension of the needle thread to eliminate random
movement of the thread between the 1st and 2nd thread
tension portions.
5-3) The thread take-up spring is 3-A) The stroke of the thread take-up Adjust the stroke of the thread take-up spring.
inappropriately adjusted. spring is too long or too small.
3-B) The tension of the thread take-up Adjust the tension of the thread take-up spring.
spring is too high or too low.
3-C) Spring selection for the thread For the A-type thread tension, replace the current thread
to be used is inappropriate. take-up spring with a standard type spring.
(for a #60 or thicker thread)
Trouble Case (1) Case (2) Check and Corrective measures
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