– 5 –
Adjustment procedures
Results of Improper adjustment
1. Take off the upper cover, loosen the clamping screw
❷
of needle
driving forked crank
❶
and move needle driving forked crank
❶
up or down to adjust the needle height.
❶
❷
(Caution) Do not fully loosen the clamping screw
❷
of the
needle driving forked crank
❶
. If the needle driving
forked crank has got out of position laterally when
its clamping screw was loosened, fully loosen the
clamping screw and turn pulley to allow the forked
crank to turn until it settles by itself. Then tighten the
clamping screw to fix the forked crank at that posi
-
tion.
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
❶
will cause seizure, play, or other
troubles.
Adjustment procedures
Results of Improper adjustment
1. Loosen four setscrews
❷
of two throat plate bases
❶
and move
two throat plate bases
❶
back and forth to adjust dimension A or B.
❶
❷
❷
o
Improperly positioned throat
plate will cause needle break-
age, contact of the needles will
the throat plate, or other trou-
bles.
