Note: The standard position
of
cam follower crank (2) prior
to the operation is shown in Fig. 10. When this
position has been changed, for example, by removing
the stopper plate, make adjustment with die adjust
screw (Fig. 6)
and
then
make
adjustment
in (1) to (3).
2
mm.
Fig.
10
32
mm
32
mm
Fixed
blade
5.1.8
Adjustment of knife engagement
(1) Positions of movable knife (left)
and
fixed blade
Movable
knife
(left)
(T)
Fig.
11
shows
the
standard
state,
with
the
feed
dial
set
to
zero.
(2)
Adjustment
of knife engagement
amount
(J) 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. 12.
9
mm
3.3
m
Knife
driving
crank
Fig. 11
1.0
to
2.0mm
Make
adjustment
by
the
installation
of
knife driving
crank.
Movable
knife
deft)
(3)
Adjustment
of
knife
engagement
pressure
(3)
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.
13.
@
When
cutting action is poor
especially
because
of thick
thread,
a
slight
increase
of
the
engagement
pressure
produces
an
effect.
@ To
adjust
the
engagement
pressure,
loosen
the
lock
nut(§)
in
Fig.
11
and
adjust
withthe adjust
screw
(§).
13
Fig.
12
Movable
knife
(left)
Fixed
blade
Fig.
13
Fixed
blade
3
mm
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