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Trouble Cause (1) Cause (2) Check and corrective measures
7. Thread breakage at needle entry
or idle stitching.
7-1) The needle has improperly
been installed.
1-A) The orientation of the needle is
wrong.
Attach the needle so that the long groove of
the needle faces exactly to the left or slightly
away from the operator as illustrated.
7-2) The knife thread guide has
improperly been positioned.
Accurately position it so that needle enters the
center of the opening.
7-3) The needle bar is too low. Raise the needle bar.
Wrap the thread around the needle.
8. Staggering stitches
Some stitches stagger, whereas
they should be aligned.
8-1) The tension of the needle
thread is too high.
Reduce the tension of the needle thread.
8-2) The needle is defective. 2-A) The needle is bent. Replace the needle.
2-B) The needle tip is blunt. Replace the needle.
2-C) Needle is too thin. Use a thicker needle. For a KN needle (single
needle), use a double needle.
2-D) The needle is too long. Use a shorter needle or a needle with longer
shank (DA x 1)
8-3) The sewing speed is too high. Reduce the sewing speed.
8-4) Feeding is inappropriate. 4-A) The parallel level of the feed
dog is inappropriate.
Replace the current feed dog with new one.
4-B) The feed dog is aslant mount-
ed.
Mount the feed dog appropriately.
4-C) The feeder bar has a backlash
in the right-left direction.
Eliminate the backlash in the state of slightly
pressing the top, bottom, and horizontal feed-
er bar pins.
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