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Troubles
Cause (1)
Cause (2)
Checking orders and corrective measures
5. TROUBLES IN SEWING AND CORRECTIVE MEASURES
Puckering
Needle is too thick.
Thread tension (needle thread or bobbin
thread) is too high.
Presser foot is defective.
Fabric is floppy.
Thread path is not smooth.
Hook timing is too late.
Feed timing is too early.
Stroke of the thread take-up is too large.
Stroke of the thread take-up is too small.
Material through which thread is hard to be
slided.
Presser foot pressure is too high.
Finish of presser foot sole is bad.
Material is hard to be slided.
Needle hole of throat plate is too large.
Recess for thread on presser foot sole is
too large.
Parallelism of presser foot is defective.
Top end of needle is blunt.
Use a thin needle if possible. KN or SPP needle is effective.
Finish the thread path.
Advance the hook timing to such an extent that stitch skipping
does not occur, and improve thread slipping.
Delay feed in terms of needle so that thread is pulled by feed
force.
Move arm thread guide to the right, and decrease thread supply
amount by the thread take-up.
Increase the stroke.
Use silicon.
Minimize the pressure. For some materials, it is effective to use
the micro-lifter screw and sew in the state that the presser foot is
slightly raised..
Polish with buff or the like to improve the slide.
Use the teflon presser foot or specially processed (teflon, etc.)
presser foot.
Replace it with gauge with small needle hole.
Use the presser foot with small recess on the sole or without
recess on it.
Replace the presser foot. Or, loosen the presser bar guide bracket
screw and correct the needle entry position and bend of presser
foot when needle entry position is improper.
Replace the needle.
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