JUKI APW-895, Engineer'S Manual

Page: 21 / 213

Adjustment of clearance between needle and hook’s blade point
1. Loosen the setscrews and of the hook shaft base on the
adjusting side.
2. Move the hook shaft base to the right and left and adjust the clearance
between the needle and hook’s blade point to 0 to 0.03mm. Then
tighten the setscrews and . At that time, the setscrew should
be tightened rigidly while the setscrew is tightened properly.
(Caution) The setscrew is tightened with the lower shaft
connected. It must be noted that the rotary torque of the
lower shaft may be increased if the setscrew is tightened
too much.
Removing the hook
1. Remove the throat plate.
2. Remove the opener.
3. Loosen the three setscrews of the hook shaft small gear.
4. Turn the hand wheel so that the needle bar comes to the highest
position. Since then, remove the hook.
Installing of the hook
1. Reassembly can be carried out in the reverse order for disassembly.
(Caution) 1. When the hook is installed, confirm that the washer
is inserted in between the hook shaft lower metal
and the hook shaft small gear.
2. When mounting the throat plate, turn the inner hook
by hand so that its embossed part is entered in the
groove of the throat plate. Since then, mount the throat
plate.
Opener adjustment
1. Turn the hand wheel in regular direction and loosen the setscrew
of the inner hook guide for adjustments so that the clearance
between the inner hook guide and the embossed part of the
bobbin case is adjusted to 0.2 to 0.3mm when the inner hook guide
is moved to the farthest retreat position in the direction of the
arrow.
(Caution) Clearance checks and adjustments should be done after
the final retreat positions of the right and left inner hook
guides have been confirmed.
– 16 –
Adjustment Procedures Results of Improper Adjustment