JUKI MOL-254 Engineer's Manual page 15

Adjustment Procedures
○ Pulling the thread trimmer cam in the direction of the arrow
mark, lightly press the thrust collar to the main shaft
bushing, middle to fit the thrust collar.
① Provide a clearance of 0.5 mm between the servo motor
and the coupling, and fit the screw No. 1 to the flat section
to install the coupling.
② Insert the rubber ring (R0154240100) in between the main
shaft rear bearing and the coupling, provide a clearance
of 2.5 mm between them, and fit the screw No. 1 to the
flat section to install the coupling.
③ Be sure to align the positions of the two screws in the
direction of rotation when making the respective couplings
engage with each other.
Results of Improper Adjustment
○ If the phase of the coupling is
improper, the main shaft does
not stop at the normal angle.
○ I f t h e c o u p l i n g i n s t a l l i n g
clearance is larger than the
specified value, moving gap of
the coupling in the axial direction
is lost. As a result, main shaft
torque will occur.
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