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Troubles
8. Thread frays.
1. Number of stitches of tie stitching is too
2. Width of tie stitching is too wide.
9. Length of needle
1. Width of tie stitching is too narrow.
thread remaining at
the end of sewing is
2. Tension of tie stitching is too low.
too long.
10. Needle thread
1. Tension at the start of sewing is too low.
breaks at the start of
sewing, or the wrong
side of seam is dirty.
11. Knife drops even
1. Check whether the thread breakage detec-
when needle thread
is cut.
12. Needle breaks.
1. Check whether needle is bent.
2. Check whether needle comes in contact
3. Check whether needle thread trimmer
4. Check whether needle comes in the center
5. Needle stop position is too low and needle
13. Knife drops plural
1. Check whether the cloth cutting knife drop-
times.
Causes
small.
tor plate is properly adjusted.
with the blade point of hook.
comes in contact with needle when it
opens.
of the needle hole of throat plate.
comes in contact with needle thread trim-
mer when it closes.
ping is set to plural dropping.
Corrective measures
○ Increase the number of stitches of tie
stitching at the end of sewing.
○ Narrow the width of tie stitching at the
end of sewing.
○ Widen the width of tie stitching at the
end of sewing.
○ Increase tension at the end of sewing.
○ Increase tension at the start of sewing.
○ Adjust the detector plate.
(Refer to the Engineer's Manual.)
○ U020 Thread breakage detection
function is set to "disable".
○ Replace the needle.
○ Adjust the needle-to-hook timing.
○ Adjust the installing position of needle
thread trimmer.
○ Re-adjust the installing position of throat
plate base.
○ Release the plural time setting.
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