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8-5

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

even thickness

Choose left-twisted

thread

Z-direction: left twist

S-direction: right twist

left-twist prevents

unraveling of the upper

thread in the counter-

clockwise rotation of the

hook

Reference

SunStar SWF Series User Manual

Questions and Answers: