Hough
the
Pfaff 353 is Identical with
the
Pfaff 343,
except
that
it
has
the
balance
He!
at
the
left, its feed
regulator
differs
considerably.
^
Pfaff
353
sews
forwards
only.
this machine, the stitch length is regulated as follows; Press button K (Fig. 12) with
thumb
of
your
right
hand
and,
with
your
left
hand,
rotate
the
balance
wheel
in
the
ction
indicated
by an
arrow
until
the
button
drops
in noticeably.
ncrease
the
stitch length,
keep
button K
engaged
and
continue
turning
the
balance
el in the direction indicated by an arrow until the number corresponding to the
red
stitch
length
appears
in
the
small
window
above
button
K.
iecrease
the
stitch length, turn
the
balance
wheel
in
the
opposite
direction.
.
with
"40^
number
appearing in the
window
indicates the
stitcSi
length
in
millimeters,
with
-4V
)ting
the
longest
stitch.
)uble-headed arrow together with a " + " and a symbol
engraved
in a small
• on the fiat top cover further facilitate the regulation of the stitch length. Turning
balance wheel toward *+ "
increases
the stitch length, turning it toward ' de-
ises
the
stitch
length.
Fig.
12
R
6972
Fig.
13
M 1
14.
Regulating
the
Pressure
on
the
Material
Turning in screw V (Figs. 7. 13 and 18)
increases
the
presser
foot
pressure
for heavier
and
harder
materials.
Lightweight and delicate materials require a lighter
pressure
which is obtained by
turning
screw
V
out.
Some
variants
of
the
Pfaff 345
are
equipped
with
one
or
two
leaf
springs
on
the
machine
arm
instead
of
the
conventional
presser
bar
spring.
On
these
machines,
the
presser
foot
pressure
is increased by turning knurled nut V upwards (Fig. 14), and
decreased
by
turning
it
downwards.
i -Kf H
mum.
0
^wm
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