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).
1
~ec
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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