Fig. 7 Attoching the knee lever
R&408
To facilitate the tilting bock of the sewing head without removing the knee
lever completely, the knee lever rock shaft is no longer screwed to the ongulor
sleeve, but rather held in place by a spring-loaded pin. As a result, the knee
lever can be pulled forward off the shaft with a slight jerk.
A new feature of the knee lever is its hinged foam-rubber-podded knee plate
which adapts itself well to the shape of the leg. If desired, the knee plate can
be locked by tightening a square bolt.
8. Regulating the Pressure on the Material
A
powerful
flat spring in the
machine
arm
exerts
the necessary pressure on the
sewing foot. The amount of pressure is regulated by turning a small set screw
which can be reached by inserting a screwdriver through the hole 19 at the
right of the spool
pin.
Turn
the
screw
in for more pressure, or out, for
less
pressure (Fig. 4).
9.
Lubrication
Recent advances in the design of needle beorings hove mode it possible to
ensure satisfactory permanent lubrication of this new high-speed sewing
machine without the use of an
automatic
lubrication system.
11
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