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9-4. The clearance between the needles and loopers
927A: Clearance of 0.05 to 0.1 mm
928A: Pushes 0.1 to 0.2 mm
The loopers (1) run in back of the needles (2) in their forward
travel and in front of the needles (2) in their backward travel.
1. Loosen the set screw (4) of the needle guard (3), and then
move the needle guard (3) to a position where it does not
touch the needle (2).
2. Loosen the bolt (6) of the looper holder (5).
3. Turn the machine pulley toward you so that the needle (2)
rises 4.9 mm [for the 927A] or 5.3 mm [for the 928A] from the
4328B
lowest needle position.
4. In this position, move the looper holder (5) to align the tip of
the looper (1) is at the middle of the needle in the left-right
direction.
Also, set to that there is a gap of 0.05 to 0.1 mm (for the
927A) or so that the tip pushes the needle by 0.1 to 0.2 mm
(for the 928A) in the forward-back direction, and then tighten
the bolt (6) of the looper holder (5).
* Check that the difference in height between the top edge
of the needle hole and the tip of the looper (1) is 2.7 mm
(for the 927A) or 2.9 mm (for the 928A) at this time.
5. Adjust the needle guard (3). (Refer to "9-5. Needle guard
adjustment".)
4329B
* Check that the clearance between the needle (2) and the back
of the looper (1) is 0.2 mm or less during the looper's
backward travel.
4330B
4277B
DA-927A, DA-928A
9. STANDARD ADJUSTMENTS
20
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