SWF MAN-12 - Page 65

65
Skipped
Stitches
① Bent needle
② Inadequate needle size for
thread
③ Incorrect installation of
needle
④ Poor timing of needle and
hook
⑤ Large gap between needle
groove and hook point
⑥ Incorrect lower dead stop
⑦ Damaged hook point
⑧ Thread feeding is interfered
⑨ Inadequate thread
(twist, elasticity, and
flexibility)
⑩ Excessive tension or stroke
on the take-up lever spring
⑪ Fabric moves with needle -
weak or damaged presser
foot (spring)
■ Change needle
■ Change needle to
appropriate size
■ Adjust installation
■ Adjust needle-hook timing
■ Adjust the gap
■ Adjust the lower dead stop
■ Use whetstone to adjust
hook point or change hook
■ Adjust thread tension
For lower thread, change
bobbin or bobbin case
■ Select right thread for
embroidery
■ Adjust stroke or tension of
the spring
■ Change presser foot spring
Inspection & Repair CauseError Type Reference