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8. Adjusting the timing of the opener
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.
❷
C
❶
[Conditions]
The displayed angle should be 0° when the
needle bar is at its upper dead point.
Right hook 195±5°
Left hook
165±5°
❸
❸
❹
❹
❻
❺
Angle display
1)
Place the machine in the hook timing adjust-
ment mode.
2） For the right hook, loosen the setscrew in the
side cover on the operator's side to remove the
side cover.
(For the left hook, remove the side cover on
the opposite side of the operator.)
3） Loosen opener cam setscrew ❺ .
4)
While checking the angle displayed on the
screen, turn the handwheel to bring the hook
to the angle shown in the table. In this state,
tighten setscrew ❺ of opener cam at the posi-
tion where opener ❶ starts to move from the
position farthest from the protruding portion C
of inner hook ❷ .
At this time, tighten setscrew ❺ of opener cam
in such a way that a clearance of 0.2 to 0.5 mm
is provided between the top surface of opener
cam ❻ and the undersurface of opener arm ❸ ❸ .
5） Install the side cover with the side cover set-
screw.
6） Press
adjustment mode.
Carry out angle correction before start-
ing adjustment of the opener timing to
make sure that 0° is displayed when the
needle bar is at its upper dead point.
In the case of the 2-needle sewing ma-
chine, opener arm clamping screw ❹ of
the left hook is located on the opposite
side of the operator.
– 11 –
button to exit from the hook timing
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