Sunstar Precision SWF/TA-WJ614-100, Руководство пользователя

Страница: 100 / 115

101
Poor stitch
tension
Needle breaks
① Weak upper thread tension
②
Uneven upper thread
tension due to foreign
substances
③ Weak lower thread tension
④
Uneven lower thread
tension
⑤ Thread thickness
⑥
Poor timing of needle and
hook
⑦
Insufficient oil in hook
①
Bent needle
②
Bad quality needle
③
Tip of the needle is worn or
bent
④ Inadequate needle size
⑤ Needle touches the hook
point
⑥
Incorrect installation of
needle
⑦ Needle touches the needle
hole on the plate
■ Adjust tension
■
Clean main and sub tension
adjusters in the thread
tension adjusting plate
■ Adjust tension
■
Clean bobbin case and
check tension on bobbin
spring
■ Change to quality thread
■
Adjust timing
■
Use whetstone to adjust
hook point or change hook
■
Change needle
■ Space the needle and the
hook point
■
Correct the installation
■ Check if needle plate is
unscrewed
■ Adjust the position of the
needle bar
■ See 8.1.9) (p.30)
■ See 8.1.10) 2) (p.36)
■
See 8.2.4) (p.43)
■
See 12.3) (p.67)
■
See 8.2.3) (p.42)
■ See 8.2.5) (p.44)
■
See 8.2.2) (p.41)
■ See 13.7) (p.83)
Inspection & Repair Cause Error Type Reference