12-7
Error Type
Cause
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
(excessive twist, elasticity,
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
Adjust installation
Adjust timing
Adjust 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
Change presser foot spring
Inspection & Repair
See 5-13-2 (p.5-18)
See 11-8 (p.11-9)
See 5-7-2 (p.5-10)
See 5-8-2 (p.5-12)
See 5-7-3 (p.5-11)
Reference
Skipped
Stitches