JUKI AMB-289, Engineer'S Manual

Page: 17 / 177

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Assembling adjustment
1. Temporarily tighten the wiper at the position where cap nut
is tight-
ened to wiper cylinder rod .
2. Fix wiper guide so that wiper guide and wiper equally come
in contact with each other within the range of the stroke of cylinder
.
3. Securely tighten wiper .
4. Fix spring A so that wiper and spring A equally come in
contact with each other on the plane within the range of the stroke of
cylinder
.
5. Adjust the holding force of thread with spring B .
6. To adjust the holding force, loosen screw and adjust so that thread
slips off with the force of approximately 20 to 25g when polyester
spun thread #50 is held.
Installing adjustment
1. Turn OFF the air supply, and fully draw out wiper
.
2. Adjust wiper cylinder installing bases A and B with the respec-
tive setscrews and so that the vertical clearance between needle
tip and the top surface of wiper is 3 to 5 mm and the lateral
dimension between needle tip and the thread holding section of
wiper is 6 to 8 mm at the sewing machine stop position (needle
bar upper dead point).
Adjustment Procedure Results of Improper Adjustment