– 31 –
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, t
hexagon wrench
into
of needle guard adjusting
screw and adjust as follows:
1) To bend the hook needle guard in direction
a
,
turn the needle guard adjusting screw in direc-
tion
A
.
2) To bend the hook needle guard in direction
b
,
turn the needle guard adjusting screw in direc-
tion
B
.
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
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
.
● For the PLC-2710, -2710-7, -2760, -2760-7
and -2765
4) Loosen bobbin case opening lever crank set-
screw
. 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.
● For the PLC-2760L
4) Loosen bobbin case opening lever crank set-
screw
. Adjust the clearance between the
bobbin case opening lever and protruding por-
tion
A
of the bobbin case to 0.8 to 0.9 mm.
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.
0.05 to
0.2 mm
B
A
a
b
4-5. Adjusting the hook needle guard
4-6. Adjusting the bobbin case opening lever
A
0.6 to 0.7 mm
2760L :
0.8 to 0.9
mm
PLC-2765
PLC-2710, 2710-7, 2760, 2760-7, 2760L
A
0.6 to 0.7 mm
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