Fig.
38
Needle
bar
f
rame
S
Zigzag Sewing
-
Fig.
39
Le
ver B c
hang
es the
pos
iti
on
of
the
needle in the needle pl
ate
slot
To
make the zi
gzag
stitch
and
the innumerable
decorative
stitches
der
ived
from it, the machine must
be
fitted with a
vibrat
ing,
rather
than
a rigid,
needle
bar
.
In
ot
her
words, in
addition
to moving up
and
down, the
needle
mu
st
be
capable
of
swinging sideways,
i.
e.
crosswise
to
the direction
of
feed.
To
accomplish thi
s,
the
needle
ba
r
of
a
zigzag
sewing machine
is
carried
in a
vibrat
ing frame. The sideways motion
of
the
need
le
bar
emanates
from
an
eccentric
and
is transmitted to
the
needle
bar
frame
by
a pitman. The
amount
of
sideways
mot
i
on
is
de
termined
by
the
stitch width set.
The stit
ch
width is i
nc
r
eased
by
:t
urning dial A clockwise (the
higher
the num-
ber
on
the di
al
, the wider the stitch}: The maximum stit
ch
width
is
about
3
/t
6",
or 4.5
mm
(Fig.
40).
When
dial A is
set
on
0,
the machi
ne
will sew
straight
.
The Zigzag Mechanism
The design
of
the
zigzag
control used
on
Pfaff machines
260
and
360
and
Pfaff
Automatics 260-261
and
360-
261
differs from
that
of
the
former Pfaff
230
and
332 machines. The well-known
zigzag
knob
of
these machines
has
been
re-
pl
aced
by
the knurled stitch width dial
A.
20
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