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32
REPLACING
A
KNIFE
BLADE
The upper
knife is
made
of
a
special
long-lasting steel
and
does
not
require
frequent
replacement.
The
lower knife
is
made
of
softer
steel and
will
need
to
be
replaced
periodically.
A
spare
lower knife
is
in the
accessory
kit.
32-1
Replacing
the lower knife.
1.
Open
the
front
cover and
rotate the
upper
knife
to
its
highest
position.
2.
Loosen
the lower knife
clamp
screw.
3.
Slide
the lower knife down
and
out
of the knife
slot.
(Figure 95)
4.
lnsert
the
new
knife
into
the slot
from
the bottom,
and move
it
up
until
the
upper
edge
is
flush
with
the
top of
the
needle
plate.
(Figure 96)
5.
Be
sure
the knife clamp
is
horizontal, then tighten the
screw.
6.
Rotate
the upper
knife
back
into cutting
position
and
close
front
cover.
33
REPLACING THE UPPER KNIFE
1. Openthefrontcoverandrotatehandwheel
tobringtheupperknifetoitslowestposition.
2.
Remove
the
upper
knife
screw,
knife
cover
and
blade. (Figure 98)
3.
lnsert
a
new
blade
with
long
point to
the
rear.
4.
Align the
top
of the
blade
with
the
top of
the
knife
cover and
tighten the
screw
temporarily.
5. Aligntheupperknifebladetothatitslowerfrontedgeoverlapsthelowerknifebylmm.Tighten
the
screw
firmly.
(Figure 97)
3a
Needle p
Lower knife
clamp screw
Lower knife
groove
Lower knife
Figure 95
,,/
fi:'[yJliJ[i.-"o'
Figure 96
€M
\
Upper
knite
screw\
fl
Figure 98
Ø
Ø
Figure
showing upper knife
at
its
at its
lowest
position.
Upper
knif
e
Needle
plate
Lower
knife
Figure 97
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