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Power Roll Drive Pulley
locknut
@t;D
Power Roll
~~
Io.!l'--=="-.
Clutch lever Retaining Bolt
"'/l
f
Coiled Compression Spring
Figure 7. Power Roll Mechanism
containing a solid power roll shaft, are pressed into the ends
of the cylinder. This shaft mounts the power roll to the ma-
chine by passing through self-aligning porous bronze bearings
that are held in retainers on both side frames. The left end of
the shaft is the mounting for the power roll pulley. The right
end of the shaft is rectangular and extends through a rectangu-
lar hole in the clutch friction disc.
KEY LEVERS, LETTER CAMS AND TYPE BARS
Letter Key Levers
The
~ear
ends of the keylevers are mounted in slots in the key
lever bearing support and are held by a fulcrum wire which
passes through a hole in each key lever (Fig. 8). This wire
serves as the fulcrum point for all key levers. The left to
right motion of the front ends of the key levers is limited by
slots
in
the front key lever guide cotnb (Fig. 9). Key lever
Com lever Bearing
Support
Figure 8. Key Lever and Cam Mounting
3
springs hold the key levers in the raised, or rest position. 'The
springs are located between the front ends of the key levers
and the
~pring
lugs on the top of the front guide comb (Fig. 15)
The travel of each key lever is limited by strips of rubber
mounted across the top and bottom of the slots in the front
guide comb. The rubber strips prevent metal to metal contact
and are a noise reduction feature. A sponge rubber keyboard
stabi lizer reduces key button vibration during machine oper-
ation (Fig. 15). It is located between the adjusting lugs on . .
the top of the key levers and the key lever bearing support.
The adjusting lugs make it possible to raise or lower individual
key levers.
Figure 9. Key Lever Guide Comb
Letter Cams
Cam lever assemblies are mounted in slots in the cam bearing
support and are held by a fulcrum wire which passes through
a hole in each cam lever (Fig. 8). A type bar link is hooked
through a hole in the long arm or extension of the cam lever.
The other end of this link hooks into the bottom of the type
bar. The rest position of the type bar, against the type rest,
determ ines the rest position of the cam lever. When the type
bar is fully actuated or against the platen, the cam lever is
also rotated to its full actuated position. Each cam lever
assembly is made up of three main parts; the c.am lever, the
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