8.
STANDARD ADJUSTMENTS
8-~~8.
Adjusting
t11e
Clearance between rotary hook and opener
(Thread release finger)
0
L~
-20-
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
permitting
the
needle thread loop to be drawn easily through the gap.
BCiearance between the opener and projection
of
hook.
1 . Loosen the
screw
(1).
2.
Adjust the clearance between projection
of
hook
and the opener
~'
by means
of
movernent
of
thread
releasing shaft bushing
@ to the right or to the left
as
may
be
required. The standard clearance between the
two
parts
is
0.7-0.9mm.
3. Tighten the screw securely.
B Position
of
the opener cam:
Place the one
of
screws
I_Q)
which
is
indicated by "S"
01~
V
ditch
of
the hook shaft.
B Adjustment
of
operation:
1.
Turn the machine pulley until the opener
'.3:
presses the
projection
of
hook
~)
extremely on its travel.
2.
Press the opener
(:1·
to
the projection
of
hook (2: and
make the right side
clearance
between
the notch on
the bobbin case holder and tab the hook retainer
(§;
0.4-0.6mm.
This adjustment can be done by loosening the
screw
3. Tighten the screw
J_l
securely.
From the library of: Superior Sewing Machine & Supply LLC
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