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Troubles Causes Checking Corrective measures
3. Loose stitches
(Balloon stitches or
isolated idling-loop)
Loose stitches
(Needle thread rises.)
Clearance of the inner hook
guide is too large.
Thread paths have been
poorly finished.
Bobbin fails to move
smoothly.
Thread is not well tightened
in the reverse feed.
Height of the feed dog is too
high.
Feed timing is excessively
advanced.
Needle thread has not been
fully pulled up.
Check the clearance.
Check the finish of the
respective thread paths.
Check the change of bobbin
thread tenstion.
Walking foot is not of top-
divided type.
Compare the height with the
standard value.
Refer to “Adjusting the inner
hook guide” on page 7.
Finish using a fine emery paper
or buff.
Replace the bobbin or hook.
Use the optional walking foot
and presser foot.
Refer to “Height of the feed dog”
on page 5.
Lower the height by 0.2 mm
than the standard value.
Retard the feed timing.
Increase the needle thread
tension.
Use the optional walking foot.
(Top-divided type)
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