DA-9270
17
9-3. Timing of loopers running clear of needles
The loopers run in back of the needles in their forward
travel and in front of the needles in their backward travel.
Adjust the clearance between the needles and the loopers
to anywhere from 0.05 to 0.1 mm in the forward travel.
1. Remove forward feed arm cover
q.
2. The forward/back looper timing should be adjusted so
that the set screw which is at the front relative to the
forward/back cam turning direction is aligned with the
screw adjustment hole
e when the set screw which is
at the front relative to the up/down cam turning direc-
tion is aligned with the looper connecting rod adjust-
ment hole
w.
To adjust, loosen the set screw which is at the rear rela-
tive to the forward/back cam turning direction, and then
loosen the set screw at the front just enough so that
the forward/back cam can be adjusted.
After adjusting, tighten the two set screws.
3. Loosen the looper holder screw
r, and then move the
looper holder
t in the direction of the arrow to adjust
so that the clearance between the tip of the looper and
the center of the needle is 0.05 - 0.1 mm when the two
are aligned.
At this time, do not move the looper holder
t in any
direction except the direction indicated by the arrow.
If it is moved in another direction, carry out the adjust-
ments given in “9 - 2. Adjusting the needle and looper
timing” on page 16.
4. Install the forward feed arm cover
q.
9. STANDARD ADJUSTMENTS
r
t
q
w
e
Front
Rear
0.05~0.1mm
Looper
Needle
9-4. Needle guard adjustment
[For movable needle guard]
The clearance between the needle guard q and the needles
w should be 0.2 mm when the stitch length is at the mini-
mum setting and the loopers are moving toward the
needles.
The heights should be adjusted to as low a setting as pos-
sible without the loopers breaking.
1. Adjust the stitch length to the minimum setting. (Re-
fer to page 12.)
2. Turn the machine pulley toward yourself to align the
loopers with the centers of the needles.
3. Loosen the set screw
e, and then raise or lower the
needle guard q so that the distance from the bottom
of the needle guard
q to the points of the needles is 1
- 2 mm.
4. Tighten the set screw
e.
5. Loosen the set screw
r, and then move the needle
guard
q to the left or right to adjust so that the clear-
ance between the needle guard q and the needles is
0.2 mm.
6. Tighten the set screw
r.
NOTE:
For some materials and threads, the best results can
be obtained if the needle guard and the needle are
touching slightly when the stitch length is adjusted
to the actual stitch length.
r
w
q
1 - 2mm
0.2mm
q
e
Turning direction
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