Note: Thestandard position of cam follower crank (2)prior
to the operation is shown in
Fig.
11.
When
this
position has been
changed,
for
example,
by
removing
the stopper plate, make adjustment
with
the adjust
screw
(Fig.
7)
and
then
make
adjustment in
(1)
to
(3).
Cam follower shaft
crank
(2)
LS2-1180-BIT
2
mm
Hook
shaft
Roller
knife
driving
/
LS2-1180-LIT
LS2-1180-MIT
LS2-1180-HIT
2
mm.
/
4.2.8
Adjustment
of
knife engagement
(1) Positions of movable knife (left) and fixed blade
®
Fig.
12
shows
the
standard
state.
Fig. 11
I
7
nini
Movable
knife
(left)
(riT'
V * ' 1
\ 7.5
mm)
\
Fixed
blade
i ^
Sii
(2) Adjustment of knife engagement
amount
®
Set
the
solenoid
to the
operation
state
and
rotate
the
sewing
machine.
Then, the
movable
knife
(left)
is rotated
by the
thread
trimmer
cam.
When
the
movable
knife
(left)
has moved
to
the
maximum,
the
standard engagement
amount
is
1.5
to
2.0
mm.
See
Fig. 13.
®
Make
adjustment
by
the
installation
of
knife
driving
crank.
(3) Adjustment of knife engagement pressure
0
The
standard
knife
engaging
pressure
is
obtained
when
the
movable knife (left) and fixed blade start making contact
with each other at the position shown in Fig. 14.
(2)
When
cutting
action
is
poor
especially
because
of
thick
thread, a slight increase of the engagement pressure
produces an effect.
0
To
adjust
the
engagement
pressure,
loosen
the
lock
nut
(S)
in
Fig.
11
and
adjust
with
the
adjust
screw
(§).
11
Knife
driving
crank
Rg.
12
1.5
to
2.0
mm
p«-
Movable
knife
(left)
Rg.
13
Movable
knife
(left)
Fixed
blade
Rg.
14
Fixed
blade
3
mm
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