– 5 –
Needle driving shaft
1) Take off the upper cover, loosen setscrew
of needle driving forked
crank
and move needle driving forked crank
up or down to adjust
the needle height.
(Caution) Do not fully loosen the setscrew
of the needle driving
forked crank
.
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 turn
until it settles by itself. Then tighten the setscrew to fix
the forked crank at that position.
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
with cause needle breakage,
contact of the needles will the
throat plate, or other troubles.
1) Loosen setscrews
of throat plate base
and move throat plate
base
back and forth to adjust dimension A or B.
Adjustment Procedure
Results of Improper Adjustment
Adjustment Procedure
Results of Improper Adjustment
Summary of Contents for MO-6700D Series
Page 49: ...45 2 Upper looper components...
