SunStar SWF/C Series - Poor stitch tension; Needle breaks

12-7
Error Type Cause
Bent needle
Inadequate needle size
for thread
Incorrect installation of
needle
Poor timing of needle and
hook
Large gap between
needle groove and hook
point
Incorrect lower dead stop
Damaged hook point
Thread feeding is
interfered
Inadequate thread
(twist, elasticity, and
flexibility)
Excessive tension or
stroke on the take-up
lever spring
Fabric moves with needle
- weak or damaged
presser foot (spring)
Inspection & Repair
Change needle
Adjust installation
Adjust timing
Adjust the lower dead stop
Use whetstone to adjust hook
point or change hook
Adjust thread tension
For upper thread, change
bobbin or bobbin case
Select right thread for
embroidery
Adjust stroke or tension
Change presser foot spring
See 5-13)
See 11-8)
See 5-7)-2)
See 5-8)-2)
See 5-7)-3)
Reference
Skipped
Stitches