9
5-7 Changing the amount of the looper font-to-back movement
The clearance between the point of the left needle
and the back side of the looper when the looper
moves to the right from the extreme left end of its
travel should be 0.05~0.1mm.
The clearance between the point of the right needle
and the back side of the looper should be 0.2~0.3mm.
The amount of the looper front-to-back movement is
factory-set properly for needle counts 9~11.
If you use needle counts 12~14, adjust the amount
as required (see below).
1.
Remove rear bed cover A.
2.
Loosen the nut on the looper front-to-back rod
pin.
To decrease the amount, move the rod pin to X.
To increase the amount, move the rod pin to Y.
The amount range is from 2.3 to 3.1mm.
The amount is factory-set at 2.7 to 2.8mm.
Adjust according to the needle count.
If the amount is excessively decreased, the needle
will rub against the back of the looper, causing
needle breakage. If the amount is excessively
increased, the clearance between the needle and the
back of the looper will increase and then skip
stitching may occur when the looper moves to the
left.
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6
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FRONT AND REAR NEEDLE GUARDS
6-1 Position of the needle guard (rear)
Align line (a) on needle guard (rear) A with the
center of the right needle hole when the needle
guard (rear) is at the bottom of the stroke.
When point of the looper passes the back side of the
needles, the needle guard (rear) should push the
right needle slightly toward the front and the
clearance between the point of the looper and the
left needle should be approximately 0.2mm.
From the library of: Superior Sewing Machine & Supply LLC
