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(2) Sewing performance
Trouble
1. Puckering
Wrinkles developed around
stitches due to stitch shrinkage or
uneven material feed.
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Cause (1)
1-1) The needle is too thick.
1-2) Thread tension (top or bot-
tom) is too high.
1-3) Pressing is inappropriate.
Cause (2)
1-A) Deformation of clothes by pene-
trating a needle into cloth
2-A) The thread path is not smooth.
2-B) The timing of the hook is too
late.
2-C) The feed timing is too fast.
2-D) The stroke of the thread take-
up lever is too long.
2-E) The stroke of the thread take-
up spring is too short.
3-A) The pressure is too high.
3-B) The finish of the backside of the
presser is rough.
3-C) The material is difficult to feed.
Check and corrective measures
Use a thin needle as much as possible. Use a
KN or SF needle (standard needle).
Finish the thread path appropriately.
Hasten the timing of the hook without oc-
currence of stitch skipping to obtain smooth
unthreading.
Delay the feed timing compared to the needle
timing to reduce feeding.
Move the arm thread guide rightward to reduce
the thread feeding with the thread take-up
lever.
Increase the stroke.
Minimize the pressure. For some materials,
sewing with the presser slightly floated with the
adjustable screw of the minute presser lifter is
effective.
Use a buff or the like to smooth the presser.
Use a fluorocarbon resin presser or a special
processed presser.
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