2.
Operation
a. Efficiency Rating
The output of on automatic bartacker is determined by the following factors:
(1)
the number of stitches
per
tack,
(2)
the
handling
times
involved
in a
given
operation
(which,
in
turn,
are de
termined by the size and bulkineess of the workpiece),
(3)
the quality of material
and
thread,
(4}
the handy arrangement of the work, and
(5)
the
speed
of the machine.
The
Pfaff
3334
automatic
bartacker
can
be
fitted
to
moke
7, 9, 14, 16, 18,
21, 24, 28,
32, 36,
42,
48,
56,
and 72
stitches
per
tack.
The
tack
design
diagrams
contained in the Subclass Catalogue (Form No.
10080)
illustrate the versati
lity
of this efficient
machine.
In
special
coses,
it may be advisable to sub
mit a sample of the moterial to be sewn as well as a specimen of the finished
work
either
to
the
Kaiserslautern
Branch
of
G.M.
Pfaff
AG
or
the
nearest
Pfaff industrial
sewing
machine
representative.
b. Mode of
Operation
While both the length and width of a bartack con be varied within certain
limits
by
simply
adjusting a lever, its shape as well as the number of
stitch
es it comprises can be varied only by exchanging the feed cam.
In
many
instances, the worm gear assembly and the knife cam must be exchanged
in
addition.
The entire sewing action, including the stopping of the
machine,
is controlled
automatically.
The machine is equipped with two cams which ore corried on a joint trans
verse
shaft
on
either
side
of
the
machine
arm.
The right, or feed, cam has two pattern-forming grooves, one on each side.
While the groove on its outside face controls the crosswise feed
motion,
the lengthwise feed motion emanates from the groove on its inside face.
The feed cam, in addition, carries
one
or several stop tripping segments as
well as one or several thread nipper tripping segments. Whereas the former
serve to stop the machine at the completion of a sewing cycle, the latter
actuate
the
thread
nipper.
The number of stop tripping segments and thread nipper tripping segments
provided on the rim of the feed cam depends on the number of tacks pro
duced
per
cam revolution.
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