5-6 Changing the looper orbit
When the looper moves around the needles, the point of the looper barely touches the
right needle and the clearance between the point of the looper and the left needle is
approximately 0.2mm.
< Note >
To sew under good conditions, adjust the looper orbit after changing the amount of the looper
f ont-to back movement by moving the timing mark slightly to X o Y.
r
-
r
To change the looper's orbit,
1.
Loosen screw B on eccentric A.
2.
Shift the timing mark by moving eccentric A front
or back.
The timing mark is factory-set for standard.
Do not change the orbit extremely.
■
The timing mark is at the standard position.
The 3 o'clock end of the orbit is at a slightly up position.
■
To advance the timing of the looper to the needle
Shift the timing mark to X. Skip stitching may occur
when the looper moves to the right.
A thread chain is not produced smoothly.
■
To delay the timing of the looper to the needle Shift the
timing mark to Y.
Skip stitching may occur when the looper moves to the
left. The needle extremely touches the back of the
looper, causing needle breakage.
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
#14~#16. If you use needle counts #11, #12 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.
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.
8
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B
L
L
X
X
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