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❸
❹
8-12. Adjusting the needle thread feeding device (Thread trimmer type only)
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.
❸
A
(A ≒ B)
❹
❺
❶
❷
❷
❺
❶
B
0.5 to 1
mm
❸
– 105 –
If the initial position of the moving knife is not
correct
Loosen the nut ❸ , and move the moving knife to the
right or left until the pin ❶ meets the marker dot ❷ .
Then, tighten the nut ❸ .
(2) Adjusting the thread trimming timing
Put roller ❹ in the cam groove. Now, gradually turn
the handwheel in the reverse direction. The hand-
wheel will go no further when marker dot ❶ en-
graved on the handwheel cover is aligned with red
marker dot ❷ engraved on the handwheel.
To adjust the thread trimmer cam, align the mark-
er dot on the handwheel cover with the red marker
dot on the handwheel, put the roller in the groove
of the thread trimming cam, and gradually turn the
handwheel in the direction opposite to the direction
of rotation of the hook driving shaft until it will go no
further. Now, tighten two screws ❺ .
■ Standard position of the feeding wire
1) Loosen screw ❶ .
2) Turn the feeding wire together with feeding wire
installing base ❷ , adjust the installing position of
the feeding wire so that a distance of C (8 to 12
mm) is provided between the top end of feeding
wire ❸ and the guide portion of thread take-up
thread guide A ❹ , and tighten screw ❶ .
At this time, leave a space of 0.5 to 1
mm between the feeding wire and the
top surface of the thread take-up thread
guide A.
3) Finely adjust with setscrews ❺ so that the top end
of the feeding wire is placed approximately in the
center (A ≒ B) of the thread take-up thread guide A.
■ When turning OFF the feeding device :
It is possible to turn OFF with the function setting
No. 89 described in the function setting list.
■ When needle thread feeding amount is desired
to be increased :
• Loosen setscrew ❶ and adjust the relation be-
tween A and B to A > B.
• Loosen setscrew ❶ and when the whole feeding
wire installing base ❷ is adjusted to the upward
direction (decrease the value, C), the feeding
amount can be increased.
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