(5) Knives
There
are
two types of knives with which the Pfoff 3334 can be fitted:
22452
22453
22096 22097
Fig. 48 Knife styles
wide
The
narrower
the
knives,
the
smeller
will be
the
amount
of
thread
that
is
pulled from the spool while the last stitch is
being
made,
and
the
shorter
will
be
the
thread
end
with
which
to
start
the
next
tack.
The
shorter
the
amount
of
thread
with which to
start
the
tack,
the
shorter
will be
the
thread
ends
which
are
left
on
the
underside
of
the
fabric
when
the
first
stitch
is
made.
The
amount
of
thread
with which to
start
the next tack must be long
enough to prevent the needle from becoming unthreaded when the first
stitch is made. Furthermore, it must be
adequate
to ensure that the first
stitch will be formed securely. Knives Nos. 22096
and
22097 normally will be
quite
adequate
for this purpose.
1 =
Set
screw
2 =
Nut
=
Knife
holder
pinion stud
bracket
4 =
Knife
bar
with
rack
Fig,49 Marking meshing teeth on knife pinion
and
rack
Changing
the Knives
The knives should be
sharpened
from time to time, particularly when the
machine is in
operation
costantly. To strip the knives, tilt the mochine
over
to the left, resting it on the wooden peg. Open the cylinder bed cap.
57
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