Adjustment Procedures
1) Take off the upper cover, loosen setscrew 8. of needle driving
forked crank
O and move needle driving forked crank O up
or
down to adjust the needle height.
(Caution) Do not fully loosen the setscrew 8 of the needle
driving forked crank
0.
If the needle driving forked
crank
has
got
out
of
position
laterally when
its
setscrew was loosened, fully loosen the
setscrew and
turn
pulley
to
allow the forked crank
to
tum
until
it
settles
by
itself. Then tighten the setscrew
to
fix
the
forked crank
at
that
position.
1} Loosen setscrews 8 of throat plate base O and move throat
plate base
8 back and forth to adjust dimension A or
B.
-9-
Results of Improper Adiustment
o Any other needle height than
specified here
will badly affect
the action of the lower looper.
the timing for.catching the upper
looper thread, etc.
o Improper lateral position
of
the
needle driving forked crank
will
cause seizure, play,
or
other
troubles.
o Improperly positioned throat
plate
will
cause
needle
breakage,
contact
of
the
needles will the throat plate,
or
other troubles.
From the Library of Superior Sewing Machine & Supply LLC
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