– 110 –
8-3. Adjusting the hook needle guard
❷
❶
❹
❸
b
a
After you have changed the hook, check the posi-
tion of the needle guard.
In the standard position, hook needle guard
❷
comes in contact with the side face of needle
❶
and as a result, the needle warps by 0.03 to 0.1
mm for the G type model, or 0.01 to 0.05 mm for
the F type model.
If the aforementioned state is not achieved, adjust
needle guard adjustment screw
❸
with slotted
screwdriver
❹
.
1) Place the sewing machine in the hook timing
adjustment mode.
2) In the case of bending the hook needle guard
in direction
a
, turn needle guard adjustment
screw in direction
A
.
3) In the case of bending the hook needle guard
in direction
b
, turn needle guard adjustment
screw in direction
B
.
4) Lastly, adjust the clearance provided between
the needle and the hook.
B
8-4. Adjusting the bobbin case opening lever
G type : 0.03 to 0.1 mm
F type : 0.01 to 0.05 mm
❶
❸
❹
❷
❻
❺
❺
A
1) Place the sewing machine in the hook timing
adjustment mode.
2) Turn the handwheel in the normal direction of
rotation to bring bobbin case opening lever
❶
to its backward end position.
3) Turn shuttle body
❷
in the direction of the
arrow until stopper
❸
is pressed against the
slit in throat plate
❹
.
4) Loosen setscrew
❺
of the opener sleeve.
Adjust the clearance provided between the
opener and projecting portion
A
of shut-
tle body to 0.25 to 0.35 mm for the G type
model, or 0.2 to 0.3 mm for the F type model.
Tighten setscrew
❺
while pressing opener
❶
downward and pressing opener sleeve
❻
upward.
A
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