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1. Thread comes off at the start of 1-1) Stitch skipping at the 1st Decrease the sewing speed at the start of sewing.
sewing stitch
1-A)Penetration registance of the Use a thinner needle. (Lower the needle count to be
thread against the cloth is small..
used.)
1-2) Length of thread remaining 2-A)
Tension controller No. 1 provides
Properly adjust the tension controller No. 1.
at the needle is not sufficient. an excessive tension.
2-B) Floating of the AT thread Adjust the amount of AT thread tension floating.
tension disc is insufficient.
2-C)Stroke of the thread take-up Adjust the stroke of the thread take-up spring.
spring is excessive.
2-D)The thread take-up spring Adjust the thread take-up spring tension.
tension is insufficient.
2-E) Level difference between the Adjust the height of the counter knife.
needle hole guide and the
counter knife is excessively high.
2-F) Needle thread tension is high Adjust the needle thread tension.
and the thread is excessively
stretched.
2-G)Thread spreading section of Polish the thread spreading section of the moving
the moving knife has scratches. knife with buff or replace the knife.
1-3)Length of bobbin thread re- 3-A)
Level difference between the
Adjust the height of the counter knife.
maining is not sufficient. needle hole guide and the (Otherwise, widen the gap.)
counter knife is excessively high.
3-B)Lower face of the needle hole Polish the needle hole guide with a buff or replace it.
guide has scratches.
3-C)
Thread spreading section of the
Polish the thread spreading section of the moving
moving knife has scratches. knife with buff or replace the knife.
3-D)Shuttle upper spring has Polish the shuttle upper race with a buff or replace
scratches. it.
3-E)The bobbin thread tension is Adjust the bobbin thread tension.
excessive.
3-F) The bobbin or bobbin case Polish it with a buff or replace it.
has scratches.
Trouble Cause (1) Cause (2) Check and corrective measures
(2) Troubles and corrective measures (Sewing conditions)
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