― 35 ―
(1) Remove stepping motor cover and V belt cover.
(2) Loosen the bracket setscrews (No.1).
(3) Remove the rubber plug (No.3) and tighten the tension adjust screw (No.2). The Y timing
belt tension will be increased.
(4) After adjustment, tighten the bracket set screws (No.1) securely and put the rubber plug
(No.3), the stepping motor cover and the V belt cover to the original position.
1
3
2
7-22. Adjustment of the V belt tension
[NOTE]
After operated the sewing machine
for a long period, the V belt tension
becomes loose. Adjust the V belt
tension periodically. The proper V
belt tension is standing that it is bent
about 10 mm with the hand pressure
of 1.0Kg as it shown on the figure.
(1) Turn the power switch OFF.
(2) Remove the V belt covers.
(3) Loosen two nut (No.2) on the motor
position adjust bolt (No.1)
(4) Fix the motor (No.5) position with putting
the tension to the V belt by its weight and
firstly, tighten the upper nut (No.2) then
secondly, tighten the lower nut (No.2).
10
ｍｍ
4
1
2
3
5
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