Pfaff 145 Instruction Book page 25

Adjusting alternating pressers of the Pfaff 145, 545, 546, 555, 596
Applies also to Pfaff machines 146, 335, 346, 195, 196, 543, etc.
(Training aid prepared for use in Pfaffs Mechanical Training Courses only).
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11 If the alternating pressers are combined with compound feed, adjust the machine at
first as instructed in "Sewing and Feeding Mechanisms of Pfaff 141 ".
12 If the alternating pressers are combined with drop feed, adjust the machine at first as
instructed in "Sewing Mechanism Pfaff 134" and "Feeding Mechanism Pfaff 134".
20 Position of the Alternating Pressers
21 When the presser bar lifter is raised, there should normally be a clearance of am
between the sole of the lifting presser and the surface of the needle plate.
The amount of fabric clearance varies with the machine model, and for C, D, and H
machines, the amount of clearance should be looked up in special tables or in our
Instructions for Mechanics. Model C and D machines are intended for heavier
materials, while Model H machines feature a higher foot lift.
22 The amount of fabric clearance can be adjusted by raising the presser bar lifter and
loosening the two binding screws in the presser bar position bracket. After the
adjustment, both screws must be tightened securely.
23 Secure the foot lift adjusting stud in the middle of the driving crank slot.
24 Loosen the binding screws of the driving crank and adjust the driving shaft so that
the vertical motion of the vibrating presser is halved by the sole of the raised lifting
presser.
25 Tighten the binding screws on the driving crank securely.
30 Foot Motion
31 Lower the presser bar so that the lifting presser rests on the needle plate.
32 Set the lifting eccentric so that
32.1 Both the needle and feed dog reach the goods at the same time (on compound-feed
machines) or
32.2 That the vibrating presser engages the feed dog when the feeding action commences
(on rigid needle bar machines).
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