Changing upper knife:
The upper knife is carbide tipped and
will not need to
be
replaced with normal
use. It has to
be
replaced only when the
cutting edge has been damaged.
Unplug the machine.
Push the upper knife
holder to the far
right and turn the knob
clockwise until it
clicks.
Unscrew the knife retaining screw ana
remove upper knife.
To
replace the upper
kn
i
fe
, insert the
retaining screw through cutout (1)
of
the
knife.
Screw it into threaded hole (2) of
the knife
holder. Tighten slightly and set
the upper knife in the cutting position.
Turn the hand
wheel counter-clockwise
until the upper knife arm is
in
the
lowest position. The front edge
of
the
upper knife
should
be
0.5
to
1.0 mm
lower
in
this position than the surface of
the
needle plate. Tighten the retaining
screw
securely.
25
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