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8. STANDARD
ADJUSTMENTS
8-8. Adjusting the Clearance between rotary hook and opener
(Thread release finger)
The opener facilitates the passage of the needle thread
loop by slightly nudging the inner hook creating a
slight rotating movement of it. This movement at that
very instant opens a clearance gap between the notch
of the inner hook and the tab of the hook retainer per-
mitting the needle thread loop to be drawn easily
through the gap.
I:J
o
L
• Clearance between the opener and pro-
jection of hook.
1. Loosen the screw
O.
2. Adjust the clearance between projection of hook
e.
and the opener"
by means of mov,ement of
thread releasing shaft bushing.
to the right or
to the left as may be required. The standard clear-
ance between the two parts is O.7-0.9mm.
3. Tighten the screw
0
securely.
• Position of the opener cam:
Place the one of screws.
which is indicated by
"S"
on V ditch of the hook shaft.
• Adjustment of operation:
1. Turn the machine pulley until the opener.
presses the projection of hook.
extremely on its
travel.
2. Press the opener"
to the projection of hook.
and make the right side clearance between the
notch on the bobbin case holder and tab the hook
retainer
0
O.4-0.6mm.
This adjustment can be done by loosening the
screw
e.
3. Tighten the screw
e
securely.
- 19 -
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