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83
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Trouble
Cause (1)
Cause (2)
Checking order and adjusting procedure
Page
2. Stitch skipping
2-1)
Attaching needle is wrong.
2-2)
Needle-to-hook timing is
improper.
1)-A
Direction of needle is wrong.
1)-B
Height of needle is wrong.
1)-C
Needle is bent.
1)-D
Needle tip is blunt.
1)-E
Needle is too thin.
2)-A
Height of the needle bar is
improper.
2)-B
Adjustment of the blade point
of hook and the needle is
improper.
Attach the needle so that the indented part of the needle faces to this
side as observed from the front of the sewing machine.
Insert the needle until the top end of the shank of needle comes in
contact with the upper end of the needle hole of needle bar.
Place the needle on the flat section of the table or the like, press the
shank section with fingers and turn the needle to check the deflection
of the needle tip. If the needle is deflected, replace it.
Replace the needle.
Use a proper needle for the fabric or thread.
Perform adjusting the timing when needle enters in the center of the
throat plate of left stitch base line. At this time, clearance provided
between the bottom end of needle bar and the top surface of throat
plate is 11.9 mm (standard) or 11.4 mm (K) at the lowest point of the
needle bar. Adjust the height using the timing gauge “1”.
Perform adjusting the timing when needle enters in the center of the
throat plate of left stitch base line. Loosen hook sleeve setscrew and
adjust, using the timing gauge “2”, so that the blade point of hook comes
in the center of needle when needle goes up from its lower dead point.
At this time, provide a clearance of 0.01 to 0.04 mm between the needle
and the blade point of hook.
(See page 2.)
(See page 2.)
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