
64
Thread breaks
⑦
Bad quality thread (weak,
uneven thickness, poorly
twisted, old)
⑧
Right-twisted thread
⑨
Excessive tension on
upper/lower thread
⑩
Tension imbalance between
upper and lower threads
⑪
Excessive tension & stroke
on the take-up spring
■
Change thread
■
Change to left-twisted
thread
■
Adjust tension
■
Adjust tension
■
Adjust tension and stroke
Selecting thread
■
soft, even thickness
tight, left-twisted
■
Z-direction : left
■
S-direction : right
※
left-twist prevents
unraveling in the
counterclockwise
rotation of the hook
Inspection & Repair
Cause
Error Type
Reference
Содержание MA-6
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