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HOW TO USE
E Relationship between the rotating
hook motion and the thread take-up
lever motion
When the timing belt is removed for replacement,
etc., the relation between the rotating hook motion
and the thread take-up lever motion should be
adjusted as follows:
( 1 ) Turn the pulley and stop when the thread
take-up lever is lifted to the highest position.
( 2 ) Lean the machine head backward and check
that the arrow (timing mark) put on the
timing belt is aligned with the black line on
the boss of lower shaft bearing.
( 3 ) If the timing mark is not in line with the
black line, remove the timing belt and install
it again to adjust.
F Relationship between the rotating
hook motion and the opener motion
( 1 ) Turn the pulley by your hand and stop it
at the position where the opener holder is
located most remotely from the throat plate.
( 2 ) Check that the gap between the lug Ⓐ and
the opener is approximately 0.2 mm.
( 3 ) If the gap is too large or small, loosen the
opener holder screw Ⓑ and adjust position of
the opener.
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
Timing mark (arrow)
Timing belt pulley
Approx. 0.2 mm
Ⓐ
Opener
— 11 —
Black line on boss of
lower shaft bearing
Timing belt
Ⓑ
Screw
Opener holder
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