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(4) Others
Thread remains uncut
after thread trimming.
Rotary knife stops during
operation.
Needle thread is not
caught.
Bobbin thread is not
caught.
Both needle and bobbin
threads cannot be
trimmed.
The blades of rotary knife
and fixed knife have
worn out or broken.
Check whether a
synthetic thread is used.
Pressure of the fixed
knife is insufficient.
Thread is too thick.
Thread trimming timing is
excessively retarded.
Pressure of the knife is
too high.
Check the thread
trimmer cam timing.
Top end of the rotary
knife has broken or been
scratched.
Check the routing of
bobbin thread.
Top end of the rotary
knife has broken or been
scratched.
Pressure of the knife is
too low.
Rotary knife fails to work.
Replsace the rotary knife or fixed
knife with a new one.
Refer to “3. (1)-3) Thread trimmer
cam timing”.
Refer to “3. (1)-4) Rotary knife and
fixed knife”.
Use a thread within the specified
value.
Refer to “3. (1)-3) Thread trimmer
cam timing”.
Refer to “3. (1)-4) Rotary knife and
fixed knife”.
Refer to “3. (1)-3) Thread trimmer
cam timing”.
Replace the fixed knife with a new
one.
Correctly thread the bobbin
thread.
Replace the rotary knife.
Refer to “3. (1)-4) Rotary knife and
fixed knife”.
Adjust the synchronizer timing.
Replace the thread trimmer
solenoid.
Troubles Causes Checking Corrective measures
From the next page
* Use separately available “21144308 Needle thread lubricator”
“B1114012000 Thread guide bar”
“B91351230B0 Silicone oiler”
Adjustment of the thread take-up spring
¡ Decrease the tension of the thread take-up spring and decrease
the stroke of the spring to improve irregular stitches.
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