65
Thread breaks ⑫ Dent on thread path on
hook and bobbin case
⑬ Narrow space between
hook holder and groove for
hook holder
⑭ Insufficient oil in hook
⑮ Poor timing of needle and
hook
⒃ Incorrect lower dead stop
⒔ Dent on thread path
⒕ Fabric moves on the
frame/plate
⒖ Inadequate height of
presser foot
(does not press the work
material)
■ Remove dent or change the
case
■ Adjust space
■ Oil the raceway of hook
■ Adjust needle-hook timing
■ Adjust the lower dead stop
■ Check:
① Thread path in presser
foot
② Around needle hole on
needle plate
③ Thread guide on the
head
④ Thread path in tension
adjuster
⑤ Thread path in upper
thread holding device
■ Fix the material firmly
■ Adjust height of the presser
foot
■ Check rotary hook
■ Set it at 0.5-0.7mm
for smooth feeding of
upper thread
Inspection & Repair CauseError Type Reference
Hook
Holder
0.5~0.7mm
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