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12-5

Error Type Cause

Bad thread (weak,

uneven thickness, poorly

twisted, old)

Right-twisted thread

Excessive thread tension

Tension imbalance

between upper and lower

threads

Excessive tension &

stroke on take-up spring

Inspection & Repair

Change thread

Change to left-twisted thread

Adjust tension

Adjust tension and stroke

Check the thread used.

How to select thread.

•Select soft thread with

ever thickness and

stable tension.

•Choose left-twisted

thread.

Z-direction: left twist

S-direction: right twist

left-twist prevents

unraveling of the upper

thread in the

counterclockwise rotation

of the hook

See 5-7)-2)

See 5-8)-2)

See 5-7)-3)

Reference

SunStar SWF/C-UK1504 User Manual

Questions and Answers: