Pfaff 3334 User Manual

b. Timing the Feed Motion
Timing the feed motion is explained with the aid of o subclass -2 machine
because the adjustment procedures can best be demonstrated here. These
procedures apply to other subclasses accordingly.
(1} Synchronizing the Feed Motion with the Needle Motion
The feed motion normally must not begin until the needle has risen clear of
the fabric, and must be completed when the needle enters the materiel
again. When extra-thick materials are being sewn, the observation of this
rule may prove impossible because the needle does not remain outside the
fabric long enough. In such cases, set the machine so that it starts feeding
shortly before the ascending needle has risen clear of the moterial complete
ly. Make sure, however, the feed motion is completed when the needle
point reaches the goods again. If the feed motion continues after the needle
has entered the material again, needle breakage is likely to occur.
To double-check this setting, turn the driving pulley by hond so that the
feed cam makes one complete revolution (on machines making three bartacks
per com revolution, for instance, the needle cycle will thus be repeated
twice). This is the only way to ascertain that the setting is correct for all
motions involved. If the settings should differ, use an intermediate setting.
To adjust, loosen hexagon nut b (Fig. 26) and feed cam position stud a, and
rotate the feed cam on its shaft, as appropriate. After this adjustment,
tighten both the nutand the stud securely.
Fig. 26
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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