Pfaff 3334 Instruction Book And Service Manual

A. Instrudtions for Operators
1. Brief Description of Machine
The Pfaff 3334 and 3334-958/01 are equipped with centra! bobbin shuttle and link take-up
and designed for tacking bars of every description automatically. Their range of applica
tions embraces all branches of the sewing industry.
The number of stitches per tack varies according to the purpose of employment of the
different subclass machines.
The work is held between the workclamp and the feed plate and moved under the
needle as required by the tack design. The needle bar moves up and down only and
does not swing sideways.
The length and crosswise feed motion needed to produce the tack is derived from two
cams which are carried on a joint shaft on either side of the machine arm. The right
cam has two control slots milled into its front and back sides. While the channel trade
on the front controls the feed across motion, the slot on the back controls the motion
of the work lengthwise of the machine arm. Another function of this cam is to stop the
machine at the end of the sewing cycle.
When you depress the right treadle, the stop motion mechanism is disengaged, the
tripping lever engaged and the driving belt shifted from the loose to the driving pulley.
While the machine is in operation, the lifting lever is locked so that the work clamp
cannot be raised.
The-left cam operates the needle and bobbin thread knives and moves them from the
inoperative to the operative position.
Whenyou depress the left treadle after the machine has been stopped automatically, the
work clamp is raised and both threads trimmed simultaneously.
2. Setting Up the Machine
Sewing head and power table are packed separately. To make the machine ready for
use, place the sewing head on the table so that the mounting holes are in line and the
machine can be secured in position with the bolts supplied. Then mount the driving
belt and attach the belt guard, screwing its bracket to the back of the tabletop.
The long chain serves to raise the clamp feet. Its top end is hooked into hook A of
lifting lever B (Fig. 6), the chain pulled through the cutout in the tabletop. and its lower
end connected to the left pedal.
The short chain is hooked into the lioie at the front end of starting lever C (Fig. 3) which
is accessible after tilting the machine back. The other end of the chain is connected to
the right pedal.
T
Fig. 1
On the Pfaff 3334-958/01, power Is transmitted by a slip-proof V-belt. The idler and drive
pulleys together from a maintenance free cone clutch, whose lining is located on the
drive pulley.
When the motor is started, the V-belt pulley of the machine idles, i.e. the clutch is
disengaged.
When starting the machine by operating its starting lever, the forked clutch lever presses
the conical idler pulley against the drive pulley lining, thus turning the drive pulley. The
machine now runs at a constant speed.
The clutch remains engaged until the machine stops automatically. When it stops, the
idler pulley is automatically
separated from the drive pulley, i. e. the clutch is disengaged
and the V-belt pulley idles. (Fig. 2)
Drive pulley
Stop lever
\
Idler pulley
Forked clutch
lever
I \! ^
Rear view
I
1
*
V \
^ —V
i I
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From the library of: Superior Sewing Machine & Supply LLC

Pfaff 3334 Specifications

General

Brand	Pfaff
Model	3334
Category	Sewing Machine
Language	English