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1. MOTOR BELT TENSION
If the motor belt tension is too tight or too loose,
machine will not run smoothly.
Adjustment
1. Remove the front and rear enclosures.
2. Loosen the 2 screws (a, b)
3. Move the motor up or downward and tentatively
tighten the screws.
Check the belt tension as follows:
• The belt does not touch to the casting or other
parts.
• The belt must have flexibility of 5-6 mm when
average pressure is applied on its sid e.
4. When correct tension has been obtained, tighten
the screws (a, b) securely.
2. TIMING BELT TENSION
If the timing belt tension is too tight or too loose, the
machine will run heavily or the timing of hook and
feed motion will be changed incorrectly.
Adjustment
1. Remove the front enclosure.
2. Loosen the screw (a) tightening the tension pulley
bracket.
3. Push the tension pulley bracket lightly (350-400g)
and retighten the screw (a).
4. When you have adjusted the timing belt tension,
re-check the timing of the upper and lower shaft
(Sec. 6) and the timing of the hook (Sec. 3) again.
Settings
1
3
2
a
2 4
a
b
5-6
mm
ネジＡ
3
350-400g
3
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