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Trouble
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1-4) The material is inappropriate-
ly stretched.
1-5) Feeding is inappropriate.
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Cause (1)
4-A) The needle hole of the throat
plate is too large.
4-B) The thread relief on the back-
side of the presser is too large.
4-C) The parallel level of the presser
is inappropriate.
4-D) The needle tip is blunt.
5-A) Too high feed dog causes jump-
ing at high speeds.
5-B) The tip of the feed dog is worn.
5-C) The pitch of the feed dog is too
large.
5-D) The inclination of the feed dog
is inappropriate.
5-E) The parallel level of the feed
dog is inappropriate.
5-F) The sewing speed is too high.
5-G) Others
Cause (2)
Replace the current gauge with a new one
having a smaller diameter hole.
Use a presser with a smaller thread relief on
the backside or without thread relief.
Part No. D1524555DBA Small clearance groove
Part No. B1524012TBO No clearance groove
Replace the presser, or loosen the presser bar
holding screw and correct the needle entry and
presser bend if there is no needle entry.
Replace the needle.
Lower the height of the feed dog (MS : 0.8
mm, SH : 1.2 mm) or increase the pressure to
prevent the material from jumping.
Sharpen the top edges.
Replace the current feed dog with a new one
having a smaller pitch.
Adjust the tilt so that the front end of the feed
dog is higher than the rear end.
Replace the current feed tooth with new one.
Reduce the sewing speed.
Use a small gauge for a gap between the
throat plate groove and feed dog in the moving
direction without interference with the move-
ment of the feed dog when a feeding pitch is
small.
Check and corrective measures
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