JUKI MOL-254 Engineer's Manual page 19

Adjustment Procedures
① Loosen setscrews
② Using the belt tension as the standard, adjust the tension
so that the belt sags 4 mm when the center of the belt is
applied with a 1 kgf load.
① Loosen setscrews
② When turning the main shaft several times, the oscillator
moves in the direction of the arrow mark and naturally
moves to the position where there is no load.
③ Temporarily tighten setscrew
④ Make the thrust collar come in contact with face A on the
machine bed and tighten setscrew
and adjust the idler.
and .
.
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12
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Results of Improper Adjustment
If the timing belt is excessiuely
pressed, main shaft torque is
increased.
As a result, heat is produced or
worn-out of bearing is advanced, or
belt is damaged early.
○ If the longitudinal position of the
oscillator is improper, seizure of
the oscillator or main shaft crank
will result.
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