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14. Needle thread feeding device
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.
❶ ❶
❶ ❶
❷
❷
(2) Adjusting the thread trimming timing
Put roller ❹ in the cam groove. Then, gradually turn
the handwheel in the reverse direction of rotation
A A
(direction A). The handwheel will go no further when
marker dot ❻ on the pulley cover is aligned with red
marker dot ❼ on the handwheel.
❼ (Red)
When you want to adjust the thread trimming cam,
B B
align the red marker dot on the pulley cover with the
red marker dot on the handwheel, put the roller in
❻
the groove of the thread trimming cam, and slowly
turn the handwheel in the direction opposite to the
direction of rotation of the hook driving shaft until it
will go no further. Then, tighten two screws ❺ .
(1) Position of the feeding wire
❹ ❹
Adjust the installing position of the feeding wire ❶ so
that a distance of 7 to 9 mm is provided between the
guide portion ❷ of the thread guide and the top end
of the wire. Then, tighten the two screws ❸ .
❸
(2) Adjusting the stroke of the feeding wire
1) Increase the feeding amount of the needle
2) Loosen two setscrews ❹ . Shift thread draw-out
(3) When turning OFF the feeding device
If it is not necessary to move thread draw-out wire ❶ ,
turn OFF draw-out device.
– 23 –
At this time, adjust the longitudinal
position of thread draw-out wire ❶ so
that thread draw-out wire is brought to
the approximate center of thread take-up
thread guide ❷ .
thread if the needle thread fails to interlace with
the bobbin thread or is likely to slip out of the
needle eyelet at the start of sewing.
wire ❶ in the direction of the arrow.
If the feeding amount of the needle
thread is excessive, the thread will be
likely to break.
* Refer to
"VI-2. Operation panel built in
the machine head" p.30
adjustment procedure.
for the detailed
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