JUKI LS-1340 Manual page 51

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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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.
A hard-to-slip thread is
used.
The blades of moving
knife and fixed knife have
b e e n i m p r o p r e r l y
adjusted.
The blades of moving
knife and fixed knife have
wom out or broken.
Pressure of the fixed
knife is insufficient.
The blades of moving
knife and fixed knife have
b e e n i m p r o p e r l y
adjusted.
The blades of moving
knife and fixed knife have
wom out or broken.
Thread trimming timing is
excessively retarded.
Pressure of the fixed
knife is insufficient.
Thread is too thick.
Thread trimming timing is
excessively retarded.
Needle thread tension is
too high.
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51
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Corrective measures
Refer to the Cause "Needle
thread remaining at the needle top
afer thread trimming is short"
D e c r e a s e t h e n u m b e r o f
threading of the needle thread.
Refer to "2) Position of the fixed
knife".
Replace the moving knife and
fixed knife with new ones.
Refer to "2) Position of the fixed
knife".
Refer to "2) Position of the fixed
knife".
Replace the moving knife and
fixed knife with new ones.
Refer to "5) Thread trimmer cam
timing"
Refer to "2) Position of the fixed
knife".
Use thread within the specified
value.
Refer to "5) Thread trimmer cam
timing"
Decrease the tension of the
thread tension No. 1.