13.
Treadle
Operation
The Pfaff
467
is regularly supplied with
two
treadles which enable
the
operator to vary the
stroke
of
the
vibrating
presser
while
sewing
and
to
reverse
the
direction
of
feed
by
foot
action.
The
standard
version
of
this
treadle
assembly
is
shown
in
sketch
1. If
desired,
the
functions
performed
by
the
left
treadle
can
be
reversed,
as
shown
in
sketch
2.
Top
feed
variation
Forward
sewing
Reverse
sewing
Forward
sewing
Sketch
1
Sketch
2
Reverse
sewing
Top
feed
variation
The only way to switch Pfaff machines
467-900
with automatic needle positioner and thread
trimmer from forward to backward sewing is by depressing finger-tip control p (Fig.
16)
by
hand.
Sketch
3 illustrates
how
the
stroke
of
the
vibrating presser, is varied,
the
needle
raised
and
lowered
and
the
threads
trimmed
by
foot
action.
Top
feed
variation
Forward
sewing
\
Sketch
3
Raising
the
needle
Lowering
the
needle
and
trimming
the
threads
The
addition
of
new
functions
and
the
advantage
afforded
by
combining
all
functions
in
one
treadle
have
necessitated
a
redistribution
of
these
functions
on
both
treadles.
17
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