20. Pfaff 238-130 with
Knee-Operated
Stitch Width Control
This machine features a knee-operated stitch
width
control
which
greatly facilitates such
operations as single-needle cording, eyelet embroidery and flat embroidery in the pro
duction of white goods, blouses, etc. (Fig. 24). A
second
treadle
serves
to raise the
presser
foot.
When
knee pressure is relieved, the stitch
width
control is automatically returned to
"0" by spring action.
On the Pfaff 238-130 the lug on the underside of pointer 2 fits snugly into notch R of
slide
S (Fig. 20).
For
this
reason,
screw
B
must
be
loosened
when
the
stitch
width
is to
be varied by
knee
action
while sewing.
Screw B is tightened to lock the slide for any desired stitch width so that the operator
need not press against the knee lever continuously when sewing satin-stitch seams
with a uniform stitch width
throughout,
in
this
way,
the
Pfaff 238-130
can
be
used
for
ordinary
zigzag
sewing, To
this
end,
an ordinary
zigzag
foot with a
smooth
sole
is
attached
to
the
presser
bar.
R
7213
Fig.
24
31