– 109 –
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
❷
must push the side face of
needle
❶
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
❹
into
❸
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 final step of procedure, appropriately adjust
the clearance provided between the needle and
the hook.
❶
❷
0.05 to
0.2 mm
❹
B
A
❸
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
❶
to
its back end position.
3) Turn inner hook
❷
in the direction of the arrow
until stopper
❸
is pressed against the slits in
throat plate
❹
.
4) Loosen setscrews
❺
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
❺
while pressing bobbin
case opening lever
❶
downward and pressing
the bobbin case holding lever sleeve
❻
upward.
❺
❻
8-3. Adjusting the hook needle guard
8-4. Adjusting the bobbin case opening lever
❶
❹
❸
❷
A
0.9 to 1.1 mm
