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8-3. Adjusting the hook needle guard
❶
❷
0.05 to
0.2 mm
a
8-4. Adjusting the bobbin case opening lever
❷
❶
A
❹
B
A
❸
b
❹
❸
❻
❺
– 97 –
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.
1)
Open the hook cover. (How to open : move the
hook cover to the right or left after lifting it right
above.)
2)
Turn the handwheel in its normal rotational di-
rection to bring bobbin case opening lever ❶ to
its back end position.
Turn inner hook ❷ in the direction of the arrow
3)
until stopper ❸ is pressed against the slits in
throat plate ❹ .
4)
Loosen bobbin case opening lever crank set-
screw ❺ . Adjust the clearance between the
bobbin case opening lever and protruding por-
tion A of the bobbin case to 0.6 to 0.7 mm.
Tighten setscrew ❺ while pressing down bobbin
5)
case opening lever crank ❻ .
Move inner hook guide ❶ up and down to make
6)
sure that there is not play in the thrust direction.
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