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F
For
safety,
be sure
to
remove
the
power
supply
plug from the
power supply socket before
start-
ing
work.
ln
most
cases,
you only
have
to
replace the
lower
kn
ife
when
cutting
becomes
difficult.
9
-1
How
to
,"pi"".
the lower knife
Replace
the lower knife
when
the
upper
knife
is
at
its highest
position.
(1
)
Turn the
lower
knife
auxiliary
screw
counter-
clockwise by 45
degrees
(1/g
turn)
to
release
its
pressure
acting on
the lower
knife
(Figure
50.1).
(2)
Loosen
the
lower
knife
clamp
screw
to
re_
move
the old
lower
knife
(Figure
50-1).
(3)
Put the
new
knife in
place
from
below
so
that it fits into the
indented
cut of
the
throat
plate.
Tighten
the
lower
knife
clamp
screw
so that the
level
of
the
lower
knife
tip
is
even
with the
surface level
of
the
throat
plate,
as
shown
in
Figure b0.2.
(4)
Turn the
lower knife auxiliary
screw
clock-
wise
by 45
degrees
(1/g turn)
to
cause
it
to
exert
pressure
on the
lower knife
(Figure
50.2).
*
Handle
both the lower knife
auxiliary
screw
and the lower knife
clamp
screw
by
using
the
attached screwdriver.
9-2
How
to
replace
the
upper
knife
ln
most
cases,
you
will
not
need
to
replace the
upper looper,
the cutting
edge
of
which
is
made
of
a
special
kind
of
long-lasting metal.
(1) Turn the
flywheel
clockwise
to
bring
the
upper knife
to
the
lowest
position.
(2)
Loosen
the
upper
knife
clamp
screw
so
that
the old
upper
knife
can be pulled
upward
(Figure
49).
(3)
Put the
new
knife
in
place
from
above so
the
front
corner
of
the
cutting
edge sinks
about
i
below
the
level
of
the
lower knife
cut_
ting
edge.
as
shown
in
Figure
51. Tighten
the
upper
knife
clamp
screw.
Figure showing lower
knifp
removal.
Lower
knife
clamp
screw
(Figure
S0_11
Figure showing lower
knife
mounted
in pos;tion.
Level
f
lat
with
throat
plate
surface
d
(Fisure
S0_2)
Figure showing upper
knife at
its lowest position.
lnsert
from
above
Upper
knife
I
Upper
knife
Pull
out
upward
Lower
knife
clamp
screw
Lower
knife
Upper
knife
clamp
screw
auxrltary
screw
Lower
knife
aUXrlrarV Screw
Lower knife
Lower knife
clamp
screw
Lower
knife
auxiliary
screw
Lower
knife
Upper
knife
Lower knife
(Figure
511
19
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