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3-23 Adjusting the tension release change-over
When the sole of the presser foot is lifted 3.5 mm or more with the knee pad or AK device, the tension release
works and the thread tension disk rises. As a result, tension is not applied to the needle thread.
When the presser foot is lifted by the thickness of the overlapped section of the fabric instead of the knee lifter, the
tension release does not work.
Especially when the knee lifter is used at the thick section to handle the material during sewing, thread tension
may become deffective.
In this case, the tension release can be released by performing the following adjustments.
(Thread trimming function is not affected since the tension release works when thread trimming.)
1) Remove rubber cap (1) located on the rear face of face plate of
the machine head.
When the machine is provided with the wiper, perform the work
after removing the wiper base.
2) Loosen change-over screw (2) with 3 mm hexagonal wrenck
key. Turn it downward until it will go no further, and tighten it
again. Tension release is possible with the knee lifter. Turn it
upward until it will go no further, and tighten it again. Tension
release is not possible with the knee lifter.
3-24 Adjusting the presser foot micro-lifter
The presser foot can be minutely lifted with ease using the micro-
lifter screw installed on the machine head to perform the sewing.
1) Loosen micro-lifter nut (1), and turn micro-lifter screw (2) to the
right to gradually lift the presser foot.
2) Tightn and fix nut (1) at the position where the optimum condition
of the sewing material is obtained through trial sewing.
(Caution) When the micro-lifter is not used, make the height of
micro-lifter screw (2) from its installing face on the
machine arm 11 mm or more.
when the micro-lifter is working, the presser foot is
in the state that it is rising under the standard sewing
condition. As a result, feed force is excessively
deteriorated.
3-25 Installing the operation panel
If the installation of the operation panel is improper, noise of snarl
may occur when the machine runs at high speed.
When installing the panel, remove two setscrews (2) in the side
plate and install it with the screws supplied with the panel in the
state that rubber (1) of the panel installing plate is securely pressed
to the upper face of the machine arm.
(1)
(2)
(1)
(2)
(1)
(1)
(2)
11mm or more
