Pfaff 343 User Manual

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1. General
The Pfaff 341. 343. 343 U-12 and 345 are all cylinder-bed sewing machines with right-
hand balance wheel whose vertical hook is arranged to the right of the needle. The
Pfaff 353 with left-hand balance wheel has the sewing hook arranged to the left of the
needle.
Both the Pfaff 341 and 342 are equipped with compound feed while the Pfaff 343. 344
and 353 are fitted with ordinary drop feed only. The Pfaff 345 and the Pfaff 346 both
feature unison feed.
All the afore-mentioned machines are equipped with sleeve take-up. The rotating motion
of the top shaft is transmitted to the hook shaft by bevel gears.
is recommended to make sure that the take-up lever is at its highest point before
oeginning or ending a seam. Observation of this rule prevents the thread slipping out
of the needle eye and thread jamming in the hook raceway. It eliminates the necessity
of holding both threads when beginning to sew.
The maximum stitch length of standard machines is 4.5 mm (5V2 s.p.i.).
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It is recommended to run the machines at the following top speeds:
Pfaff 341
Pfaff 342
Pfaff 343
Pfaff 343 U-12
Pfaff 344
Pfaff 344 U-12
Pfaff 345
Pfaff 346
2.600 s.p.m.
2.500 s.p.m.
2.700 s.p.m.
1.400 s.p.m.
2,600 s.p.m.
1.400 s.p.m.
2.500 s.p.m.
2.400 s.p.m.
When sewing tightly woven or heavily dressed fabrics, the sewing speed must be
reduced to prevent overheating of the needle.
On two-needle machines, the maximum sewing speed diminishes as the needle gauge
«creases.
To avoid trouble, these machines should be run at about 70% of their top speed until
all parts in movable contact have become thoroughly glazed by their action upon each
other. This should normally be the case after about two weeks' constant use.
All machines are regularly equipped with a fixed pulley which is cast in one with the
balance wheel. If desired, however, the machines can be supplied with a disengageable
pulley.
If fitted with a disengageable pulley, the machine is dispatched with the sewing mecha
nism disengaged. To engage this mechanism, hold the balance wheel steady with your
left hand and tighten the large locknut by turning it clockwise.
The spool holder on the machine arm is supplied on special request and at extra cost
only because the thread stand which is regularly supplied with the machine ensures
better thread control.
From the library of: Superior Sewing Machine & Supply LLC

Pfaff 343 Specifications

General

Brand	Pfaff
Model	343
Category	Sewing Machine
Language	English