Pfaff 3114 User Manual

these manipulations can she commence sewing. The best way to get to
know the machine is to turn the machine pulley by hand and to study all
phases of the performance of the machine. Then, preferably without
threading the machine and with the bobbin case removed, switch on the
motor and run the machine, but don't let the knife cut.
By pressing down the right treadle, the brake is released and the front
driving belt (low speed) is shifted from the front loose pulley to the front
driving pulley, thus driving the machine at half speed. When pressing the
right treadle all the way down (and then taking the foot off the treadile),
the rear driving belt (high speed) is shifted from the rear loose pulley to
the rear driving pulley, thus bringing the machine to full speed. At this
stage, the front driving belt is shifted to the rear loose pulley, and locking
lever S arrests lifting lever L so that the work clamp cannot be raised
accidentally while sewing (Photo 18).
The two-belt drive ensures that the machiiie is accelerated to top speed
not only faster but also at a lesser power consumption and that belt
slippage and excessive wear are greatly eliminated.
13. Stopping the Machine
After completion of the buttonhole the machine stops automatically. Shortly
before making the bartacking stitches, the machine is automatically slowed
down to half speed in order to effect a soft impact of the buttonhole knife.
Another
advantage of this reduction in speed is the fact that the momentum
of the machine is much less and can be easily absorbed by the double
buffer springs when the machine stops instantaneously. This will greatly
eliminate the breakage of parts and trouble in the machine.
14. Stopping the Machine While Sewing
Instant stopping of the machine during the sewing cycle is particularly
Important when thread jams
in the hook race or the needle breaks ios,
otherwise, the fabric or the hook would be damaged by fragments of the
needle or its stump. This is especially essential with delicate fabrics which
would be easily damaged by punctures of the needle stub.
The machine is stopped by quickly pressing down hand stop lever 15 twice
(Photo 19).
In
case the bobbin runs out of thread or the thread breaks while sewing
the buttonhole, it is possible to let the machine complete the needle cycle
until it is in starting position again. However, the cutting of the knife at
the close of the needle cycle must be prevented in any case.
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From the library of: Superior Sewing Machine & Supply LLC

Pfaff 3114 Specifications

General

Brand	Pfaff
Model	3114
Category	Sewing Machine
Language	English