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Troubles
Thread slips off the needle
2
eyelet.
Defective thread trimming.
3
Causes
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.
M o v i n g k n i f e s t o p s
during operation.
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– 56 –
Checking
C h e c k w h e t h e r t h e
needle thread remaining
at the needle top after
thread trimming is short.
C h e c k w h e t h e r t h e
needle thread remaining
at the needle top at the
start of sewing is short.
Hard-to-slip thread is
used.
The blades of moving
knife and waiting knife
have been improperly
adjusted.
The blades of moving
knife and waiting knife
have wom out or broken.
Pressure of the waiting
knife is insufficient.
Presser foot drops from
cloth at the time of thread
trimming.
The blades of moving
knife and waiting knife
have been improperly
adjusted.
The blades of moving
knife and waiting knife
have wom out or broken.
Thread trimming timing is
excessively retarded.
Pressure of the waiting
knife is insufficient.
Presser foot drops from
cloth at the time of thread
trimming.
Thread is too thick.
Thread trimming timing is
excessively retarded.
Needle thread tension is
too high.
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Corrective measures
Refer to the Cause "Needle
thread remaining at the needle top
afer thread trimming is short"
Decrease the number of times of
threading needle thread.
Refer to "(18) -3) Knife pressure"
and "(18) -4) Initial position of the
moving knife and the waiting
knife".
Replace the moving knife and
waiting knife with new ones.
Refer to "(18) -3) Knife pressure".
Perform thread trimming on cloth.
Refer to "(18) -3) Knife pressure"
and "(18) -4) Initial position of the
moving knife and the waiting
knife".
Replace the moving knife and
waiting knife with new ones.
Refer to "10. TIMING CHART".
Refer to "(18) -3) Knife pressure".
Perform thread trimming on cloth.
Use thread within the specified
value.
Refer to "10. TIMING CHART".
Decrease the tension of the
thread tension No. 1.
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