All machines with the exception of the Pfaff 141-705/03
and
143-705/03
are
regularly fitted
with
a spring-return feed regulator. This device incorporates a spring
which
permanently
holds the feed regulator lever down in forward feeding position. When the lever is
pushed up as far as it
will
go, the machine
will
sew in reverse. And conversely, when
the
lever
is
released,
forward
sewing
will
be
resumed
instantly.
If
desired,
the
machine
can
be fitted with a
pedal
which
makes
it
possible
to
reverse
the
direction
of
feed
by foot
action.
12. Regulating the pressure on
the
material
The amount of pressure to be exerted by the
presser
foot must be adapted to the ma
terial to be sewn. The pressure is set correctly if the material is advanced through the
machine evenly without being injured by the teeth of the feed dog.
The pressure on the
material
is regulated by turning screw V
(Fig.
8).
Turn
this screw
in for
more
pressure,
or out for
less
pressure.
Depending
on the
version,
Pfaff
145,
146,
545.
546
and
555
machines
are
equipped
with
one or two leaf springs on the machine arm instead of the conventional presser bar
spring
with
pressure
regulating
screw.
On
these
machines
the
presser
foot
pressure
Is
increased by
turning
knurled
nut V
(Fig.
13)
upwards,
and decreased by
turning
It
downwards.
Fig.
13
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