– 17 –
❶
A
❸
❺
❹
❷
20. ADJUSTING THE HOOK NEEDLE GUARD
21. ADJUSTING THE BOBBIN CASE OPENING LEVER
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
❶
by 0.1 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 needle guard adjusting
screw
❸
and adjust as follows :
1) To bend the hook needle guard in direction
a
, turn
the needle guard adjusting screw
❸
in direction
A
.
2) To bend the hook needle guard in direction
b
, turn
the needle guard adjusting screw
❸
in direction
B
.
1) Turn the handwheel in its normal rotational direc-
tion to bring bobbin case opening lever
❶
to its
back end position.
2) Turn the inner hook
❷
in the direction of the
arrow until bobbin case stopper
❸
rests in the
groove (operator's side) in throat plate
❹
.
3) Loosen screw
❺
in the bobbin case opening
lever and adjust so that a clearance of 0.7 ± 0.1
mm is provided between the bobbin case open-
ing lever
❶
and protruding section
A
of the inner
hook
❷
.
❶
❷
❹
B
A
❸
a
b
❶
A
0.7 ± 0.1 mm
0.1 to 0.2 mm
❶
❷
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
