a. Purpose of Employment
The
Pfaff
3334
is
specially
designed
for
automatic
bartacking
and short
seaming
operations
of
every
description.
While
both
the
shape
of the
tack
and the number of stitches per tock ore predetermined for each subcloss, the
size
of
most
tacks
can
be
varied
within
certain
limits.
The machine'sfield of application embraces oil branches of the sewing indus
try.
Thus,
opart
from
bartacking, it may be
employed
for
stitching
staying
seams,
attaching
belts
and straps, and
stitching
arnamentol
tacks,
to name
justa few additional applications. (See ill.on page 7).
The Pfaff
3334
is of the cylinder-bed construction.
Its
slender cylinder arm
greatly facilitates the
handling
of the
work,
particularly
when
tubular arti
cles
are
being stitched.
If desired, the Pfaff 3334 automatic bartacker can be fitted with electro
magnetic
control,
this
version
being
known
as
Pfaff
3334
X
35
in
Models
Aand
B,
or Pfaff 3334X45 in Model C. On this machine, the functions of raising the
work clomp and storting the
machine
are performed by solenoids, and the two
treadles of the standard model ore replaced by a foot switch (Fig.4).
Feed
Motion
The work is held between, and guided by, the work clamp and the feed
plate. To produce the desired
tack,
the material is
moved
up and across the
machine bed while the needle moves up and down. The feed motion is deriv
ed
from
the
feed
com.
The Pfaff 3334 attains a speed of up to
1,200
s.p.m., depending on the
thickness of the material as well os the size
and
shape
of the tack. To convert
the machine from one subclass to another, it
will
be sufficient normally to
exchange the feed plate and the clamp feet rather than the complete work
clamp.
If,
however, the shape and size of the tack or the number of stitches in the
design
ore to be changed, the feed cam,
knife
cam,
worm
and
worm
wheel
have
to be exchanged.
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