−5 −
Adjustment Procedures Results of Improper Adjustment
1. Adjust the timing by the needle rocking drive pinion.
<How to check after the adjustment>
Place a sheet of paper at the needle entry position, turn the
hand pulley by hand and make sure that the needle sways in
the lateral direction.
Place a block of 8 mm under the rod and press down the needle
bar rocking rod. Then, the rod comes down. In this state, loosen
the setscrew in the needle bar rocking arm, rear to adjust the
height.
(Caution) When tightening the setscrew in the needle bar
rocking arm, rear, tighten it so that there is no
thrust play between the needle bar rocking arm,
rear and the needle bar rocking shaft bushing.
Setscrew
Needle bar rocking
arm, rear
Needle bar rocking rod
™ When the engraved marker line is
not aligned, needle sways to cause
needle breakage, stitch skipping,
etc.
™ When the height of the needle bar
rocking rod is improper, stitch width
of parallel section of the right and
left sides will change.
™ If the needle entry position is
improper, when the needle stitch
width is increased, the other side
comes in contact with the needle
and the hole in the throat plate. As
a result, needle breakage or thread
breakage will result.
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