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When a hook has been replaced, be sure to check
the position of the hook needle guard.
As the standard position of the hook needle guard,
hook needle guard
must push the side face of
needle
to lean the needle by 0.05 to 0.2 mm away
from its straight position.
If the state of the hook is not as shown above, fit
hexagon wrench
into
of needle guard adjusting
screw and adjust as follows:
1) Place the sewing machine into the hook adjust-
ment mode.
2) To bend the hook needle guard in direction
a
, turn
the needle guard adjusting screw in direction
A
.
3) To bend the hook needle guard in direction
b
, turn
the needle guard adjusting screw in direction
B
.
4) At the nal step of procedure, appropriately adjust
the clearance provided between the needle and
the hook.
0.05 to
0.2 mm
B
A
a
b
1) Place the sewing machine into the hook adjust-
ment mode.
2) Turn the handwheel in its normal rotational di-
rection to bring bobbin case opening lever
to
its back end position.
3) Turn inner hook
in the direction of the arrow
until stopper
is pressed against the slits in
throat plate
.
4) Loosen setscrews
of the bobbin case open-
ing lever sleeve. Adjust the clearance provided
between the bobbin case opening lever and
the projection
A
of the bobbin case to 0.9 to 1.1
mm. Tighten setscrews
while pressing bobbin
case opening lever
downward and pressing
the bobbin case holding lever sleeve
upward.
8-3. Adjusting the hook needle guard
8-4. Adjusting the bobbin case opening lever
A
0.9 to 1.1 mm
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