II
Cam Stack and Shaft (252-257)
Removal:
30
1) Remove D
2)
Set
stitch
width
lever on • Straight Stitch • .
3)
Set
needle
posit
ion lever on •
Righi
fl{eedle •.
4) Loosen
screw
A.
5) Remove cam stack assembly 8.
Caution
on
Reassembly:
When reassembl
in
g cam stack unit 8 , make certain that the
eccentr
ic
portion
of shaft C faces to
the ri
ght
as shown in fig. 0 .
Gear mesh adjust:
1) Loosen set
screw
A.
2) Rotate
eccentr
ic shaft C
clockw
ise until there is no play between worm wheel and worm on
shaft but without bi
nding
.
3)
Tighten set
screw
A and
check
for free movement by
turning
handwheel for a
complete
rotation
of
worm
wheel : (18 rotations
of
handwheel).
Note: After this adjustment
check
adjustment on sideways setting of needle bar
as
in ll!J then
as in m -
Pendulum timindg adjust:
Check:
1) Place a
piece
of
paper under
needle
.
2) Set
needle
posit
ion lever
on
• Center Needle • and
stitch
width lever on maximum
stitch
width.
3) The
correct
t
imi
ng
of
the
pendulum
movement of the
needle
bar can
be
observed by manually
operating the handwheel in the normal
operating
di
rection
. The
point
of the
needle
should move
upward until the needle is
completely
out of the
paper
before moving in the lateral
direction
and
should
reach its peak of ascent
sl
i
ghtly
past
center
of the two extreme positions of the
needle. On the
downward
stroke
all lateral motion
should
cease when the needle point is 3 to
6 mm (.12
to
.24) above the throat plate. See fig. J 1. The
needle
must return into the
opposite
needle
hole
precisely
.
Setting:
1) Loosen sli
ghtly
the two
screws
E.
2) Turn handwheel
until
cam
follower
L is in a
posit
ion
corresponding
to
one
of
the high lobes on
the cam and the needle bar is in
its
lowest position. Ma
intaining
the
needle
bar
in its lowest
position, turn the cam
stack
by hand
so
that the
center
po
int
ol
cam
follower
L Is in
line
with
the
center
of the high l
obe
of the cam as shown in lig. K.
FOAM
723
(1172)
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