−
105
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Troubles
Cause (1)
Cause (2)
Checking order and adjusting method
Stengthen the bobbin thread tension.
Replace the needle hole guide with a new one having a smaller
hole diameter.
Increase the pitch at the final stitch.
Control the flopping of cloth.
Properly adjust the tension of tension controller No. 2.
Properly adjust the thread release mechanism.
Properly adjust the tension and stroke of thread take-up spring.
Replace the needle with a thicker one.
Replace the needle hole guide with a new one having a larger needle
hole diameter.
Raise the material to be sewn by means of the feed plate.
Raise the material to be sewn by means of the feed plate.
Increase the tension of tension controller No. 2, or decrease the
tension of auxiliary thread tension.
Change the feed timing using the memory switch.
Moving knife does not spread bobbin
thread.
Defective adjustment of the tension
controller No. 2
Tension controller No. 2 or auxiliary thread
tension is floating.
Thread take-up spring is maladjusted.
Selection of the needle to be used is
improper.
Selection of the needle hole guide is
improper.
Shape of the feed plate is defective.
Thread slips from the thread guide wheel
of the auxiliary thread tension. (G and Z
types)
Feed timing is defective.
Bobbin thread tension is too low.
Needle hole of the needle hole guide is too
large.
Pitch at the final stitch is small.
Flopping of cloth
Tension of the tension controller No. 2 is
low.
Needle to be used is thin.
Hole diameter of the needle hole guide to
the needle to be used and thread is small.
Material to be sewn is stiff and closely
comes in contact with the throat plate, and
there is no clearance between them to pass
the thread.
Material to be sewn is highly elastic and
closely comes in contact with the throat
plate, and there is no clearance between
them to pass the thread.
Balance of tension of tension controller No.
2 and that of auxiliary thread tension is
defective.
Feed timing is too fast.
7. Poor tense stitches
Summary of Contents for LK-1941
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