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Troubles Causes Checking Corrective measures
2. Thread slips off the
needle eyelet.
3.Defective thread
trimming
Needle thread slips off the
needle eyelet immediately
after thread trimming.
Needle thread slips off the
needle eyelet at the start of
sewing.
Thread cannot be trimmed.
Thread remains uncut after
thread trimming.
Moving knife stops during
operation.
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Check whether the needle
thread remaining at the
needle top after thread
trimming is short.
Check whether the needle
thread remaining at the
needle top at the start of
sewing is short.
The blades of moving knife
and counter knife have been
improperly adjusted.
The blades of moving knife
and counter knife have worn
out or broken.
Pressure of the counter
knife is insufficient.
The blades of moving knife
and counter knife have been
improperly adjusted.
The blades of moving knife
and counter knife have worn
out or broken.
Thread trimming timing is
excessively retarded.
Pressure of the counter
knife is insufficient.
Thread is too thick.
Thread trimming timing is
excessively retarded.
Tension of the needle
thread is too high.
Refer to the Cause “Needle
thread remaining at the needle
top after thread trimming is
short” on page 50.
Refer to “Position of the counter
knife and the clamp spring” on
page 25.
Replace the moving knife and
counter knife with new ones.
Refer to “Adjusting the knife
pressure” on page 27.
Refer to “Position of the counter
knife and the clamp spring” on
page 25.
Replace the moving knife and
counter knife with new ones.
Refer to “Thread trimmer cam
timing” on page 31.
Refer to “Adjusting the knife
pressure” on page 27.
Use thread within the specified
value.
Refer to “Thread trimmer cam
timing” on page 31.
Decrease the tension of the
tension controller No. 1.
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