III.
THINGS
TO
BE
NOTED
WHEN
DISASSEMBLING
AND
ASSEMBLING
THE
MACHINE
(1)
How
to
remove
the
shuttle
driver
shaft
When removing the shaft do not pull
out
the pin from the drive gear attached to the shuttle driver shaft under any
circumstances, or
the
needle bearings
under
the
rear sleeve will break.
To
remove
the
shuttle
driver
shaft,
loosen
the
setscrews
of
the
shuttle
driver
and
the
thrust
washer
and
screw
of
the
oscillating rock shaft located under the bed, and the shaft can be pulled out from the rear
of
the machine.
(2)
How
to
remove
the
main
shaft
1) Take
out
the needle.
2) Remove the stop-motion lever.
3) Set the feed cam
driving
worm free by loosening the setscrews and
remove
eachsetscrew of the counterweight,
thrust collar and main shaft rear bushing. Do not forget to remove the screwsfrom the main shaft rear bushing,
because these screwshave been screwed into the countersunk part
of
the bushing as shown in Fig.38.
4) Remove the tension spring from the knife driving bar and keep the knife driving rod tripping assembly away
from the rear end
of
the main shaft rear bushing.
5) Pressa brassrod againstface ® and tap it so that the main shaft comesout (Fig. 38).
IV.
ELIMINATION
OF
EXCESSIVE
PLAY
(1) Excessive play In
the
main shaft
Rear
bushing
setscrew
Feed
cam
Thrust
collar
setscrew
\
Fig.
38
(2)
Excessive
play of the feed cam
driving
worm
against
the feed
cam
driving
worm
wheel
1) Thisplay willaffect the timingof cloth feed.
2) Remove
the
cover from the machine arm
and
loosen the 4
screwswhich set the feed cam drivingworm.
Firmly
hold the
worm
wheel
shaft to keepit in positionin
relation
to
the
main
shaft
and
turn
the
worm
in
the
direc
tion
of
the
arrow, so
that
the
worm moves towards
the
mainshaft rear bushingand the
excessive
play is eliminated.
After this adjustment, securely tighten the 4
screws
(Fig. 39).
-
21
-
1) When the main shaft becomes loose in its
axial direction after a long period
of
operation, it will affect the timing
of
the
feed
and
thread
tension
release
actions.
To
eliminate this,
move
the
thrust
collar
in
the
direction
of
the
arrow
while
rotat
ing the feed cam in the same direction
(Fig. 38).
2) Providethe main shaft with a normal play
of
0.01
to
0.04
mm.
3) After this adjustment, the timing of the
feed cam, stop-motion regulating cam and
thread
tension
release
action
must
be
readjusted accordingly.
Fig.
39
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