13.
Setting
the
Needle
Position
Lever
H
can
be
set
in
notch
I, II
or
III
and
serves
to
move
the
needle
from
the
center
to
the
left
or
right
of
the
needle
plate
slot.
With lever H In notch I,
the
needle
is
at
the
extreme
left of
the
needle
plate
slot
in
straight
sewing,
and
swings
to
the
right in
zigzag
stitching.
When lever H is
set
in notch II, the
needle
is
centered
in
the
needle
plate slot in straight
sewing,
and
swings
both
ways
in
zigzag
stitching.
With lever H in notch
III,
the
needle
is at
the
extreme right of
the
needle
plate slot in
straight
sewing,
and
swings
to
the
left in
zigzag
stitching.
The
needle
position can be
changed
while sewing. When
the
machine is not in
opera
tion, however, raise the needle
out
of the fabric before you change the needle position.
Failure to
observe
this precaution may
cause
bending or breaking of
the
needle.
14.
Regulating
the
Pressure
on
the
Material
Smooth feeding and uniform stitching greatly depend on the correct amount of presser
foot
pressure.
Staggering
stitches
and
feed
markings on
the
underside
of
the
fabric
are
a
direct
result
of
incorrect
pressure
regulation.
To increase the pressure for heavier fabrics, turn screw V in, and to
ease
the pressure
for lightweight materials, turn it
out
(Fig. 13).
When stitching delicate and
sheer
fabrics, feed a piece of tissue paper under the mate
rial to protect it from the feed points and prevent puckering. This paper can be readiiy
pulled
away
after
sewing
has
been
completed.
15.
Selecting
the
Correct
Needle
The
Pfaff
238
is
fitted
with
round-shank
needles.
Model A machines
use
short System 133
needles
which will not tremble, regardless ofthe
sewing
speed,
and
hence
assure
neat
seams.
Model B machines
are
equipped
with System 134 R
needles
which
are
about
5/32", or
4 mm, longer
and
are
available in a number of different point styles to suit various
materials.
Pfaff 238-115
cording
machines
use
System
130 B
needles
with a
smaller
shank
dia
meter. Pin tucks are made with two System 130 Br and Bl needles which are placed be
tween the needle holder jaws with their flat
sides
facing,
and
are
secured
in position by
tightening the needie
gauge
regulating screw. To make three System 134 RFr RFI
needles
having a flat on the right and left side of the shank, respectively, and two System 134
Rfmc
needles
whose
shank
is
flattened
on
both
sides.
The
number
indicating the
needle
size is identical with
the
diameter of
the
needle
shaft,
or
blade,
expressed
in
hundredths
of millimeters.
Thus,
if
the
diameter
of a
needle
is
0.8
mm,
its
size
Is
80.
20
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