4.2.3.3 Relation between fixed blade
and
movable knife (left) edge
(1) Fig. 5
shows
the
standard
state.
0.3
mm
(2) If
the
dimension
indicated
in Fig. 5 is
too
large,
three-thread breakage will occur, leading
to
needle
thread
cast-off, etc.
after
the
thread
trimming.
Reversely, if
the
dimension is
too
small, thread
trimming
error
may result. Therefore,
caution
must
be
exercised.
(3) Make
the
adjustment in (2) in
the
installation
procedure of fixed blade bracket unit or in
the
installation
procedure
of
fixed blade.
4.2.4
Connection
of
knife
base
and
knife
driving
crank
(1) Make
connection
as
shown
in Fig. 6.
At
this
time,
use
care
for
the
position
of
link
depends
on
the
sewing
machine
model.
4.2.5
Knife
driving
shaft
and
related
parts
(Knife
edge).
•j-r
Fixed
blade'
LS2-1180-LIT
LS2-1180-MiT
LS2-1180-HIT
Link
Knife
driving
crank
Coil
spring.
Cam
follovwer
crank
(1)
,\
\ Cam follower
crank
(2)
^
[rf
\
c;
Bushing
90.5
mm
(BIT:
87.5
mm)
Cjyr
Stopper
Knife'driving shaft
Rg.7
Rg.5
Rg.6
Movable
knife
(left)
/
o
o
LS2-1180-BIT
(1) Fig. 7 shows
the
standard setting position.
(2) During assembling, be sure
to
pass
the
knife driving shaft through
the
knife driving crank first.
(3) Fix the cam follower crank (1) to the recess of knife driving shaft
at
the position shown in Fig. 7.
(4) Fix the stopper to the
recess
so that the knife
driving
shaft can rotate smoothly without play in the
axial
direction.
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