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WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
Trouble Cause Checking Corrective measures
5. Loose stitches (Balloon stitches or
isolated idling loop)
5-1) Clearance between the
inner hook guide and the
protruding section of inner
hook is too large.
1-A) Check the clearance. Refer to “2.-(5) Adjusting the inner hook guide”.
5-2) Thread paths have been
poorly nished.
2-A) Check the nish of the re-
spective thread paths.
Finish using a ne emery paper or buff.
5-3) Bobbin fails to move
smoothly.
3-A) Check the change of bobbin
thread tension.
Replace the bobbin or the hook with new ones.
5-4) Thread is not well tightened
in the reverse feed.
4-A) Walking foot is not of top-
divided type.
Use the optional walking foot and presser foot.
5-5) Height of the feed dog is too
high.
5-A) Compare the height with the
standard value.
Refer to “2.-(3) Height of the feed dog”.
Lower the height by 0.2 mm than the standard
value.
5-6) Feed timing is excessively
advanced.
Retard the feed timing.
5-7) Hard-to-slip thread is used. Use silicon oil. (Refer to * below.)
* Use separately available parts below :
• 21144308 Needle thread lubricator
• B1114012000 Thread guide rod
• B91351230B0 Silicon oiler
6. Loose stitches (Needle thread
rises.)
6-1) Needle thread has not been
fully pulled up.
Increase the needle thread ension.
Use the optional walking foot. (Top-divided type)
海外講習会用121122LU-2810(-7)EM
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