21.
NEEDLE-TO-SHUTTLE
RELATION
'0
0.3
~
0.5mm
j-ii
0.05
~
0.1mm
(Adjusting
the
height
of
the
needle
bar)
1.
Turn
the
changeover pulley by
hand
to
bring needle
bar
O to
the
lowest position
of
its
stroke
(see
'To
operate
the
sewing
machine
manually").
2.
Remove
the
rubber
cap,
and
loosen setscrew 0 .
3.
Turn
the
driving
pulley
by
hand
to
make
upper
marker
line Q engraved
on
the
needle
bar
meet
the
bottom
end
of
lower
bushing 0 of the needle bar.
Ti^ten
setscrew 0 .
(Positioning
the
shuttle)
4. Further
turn
the
driving pulley until lower marker line © engraved on needle bar O meets
the
bottom
end
of
lower bushing
©
of
the
needle bar.
5. Loosen shuttle driver setscrew O , and open shuttle race latches 0 to the right and left, respectively while pulling them
towards you to remove shuttle race ring 0 .
(Caution)
At
this time, be careful
not
to
allow
shuttle
7'
to
fall.
6. Perform
adjustment
so
that
no clearance is provided
between
the
needle and
the
front
end of
shuttle
driver 0 when
the
blade point of shuttle 0 is aligned with center 0 of needle 0 . Then tighten shuttle driver setscrew O .
(Caution) At this time, be very careful
not
to
cause
the
shuttle race
to
slip in
the
direction of
rotation.
7. Loosening setscrew © ,
turn
shuttle race adjusting shaft © clockwise or counterclockwise for adjustment to provide a
0.05 to
0.1mm
clearance between needle 0 and shuttle 0 ,
then
tighten setscrew © .
8.
After
adjustment,
install
shuttle
race ring 0 .
22.
ADJUSTING
THE
THREAD
TENSION
RELEASE
TIMING
4mm
-7-
1. Remove five setscrews O to
take
off
top
cover 0 .
2. Loosen socket screw Q
of
tension arm 0 by L-shaped
wrench 0 , and
turn
the tension arm to make adjustment
so
that
a
4mm
clearance
is
provided
between
the
end
of
connecting rod 0 and
that
of
tension post support plate
0 when the work clamp foot is up (when connecting
rod
0 is
retreated).
3. After adjustment, securely tighten socket screw O •
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