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the primary lug of the release lever and a spring loaded finger
forces the cam into the rotating power roll. The cam revolves
with the power roll causinsthe cam frame and the operating
link to be actuated. If the key lever is held down, the non-
repeat lug of the release lever prevents the cam from repeating
or re-engaging the power roll.
As
the key lever is allowed to
restore to its upper or rest position, the cam lug resets from the
non-repeat lug to the primary lug of the release lever.
Cam released with the
A double lobe cam has two lugs on the cam and makes. a one
half revolution
Cit
each operation of the key lever (Fig. 40).
A single lobe cam has a single lug on the cam ane!. makes a
full revolution at each operation of the key lever (Fig. 41).
The shift cam has two lugs but one is offSet so that the cam
makesa .one halfrevolution when the key lever is depressed,
arid completes the revolution when the key lever is restored
upward (Fig. 42). Only the shift mechanism uses this double
action type cam.
Figure 42. Double Lobe Shift Cam
SPACE BAR
Escapement lever
Plate
Upper· Space Bar Stop Bracket
Adjustable Slop SCrew
Figure 43. Space Bar Mechanism
The spoce bar mechanism provides the operator with a means
of moving the carriage to the left one space at a time without
placing a typed character on the paper (F.ig. 43).
The space bar is mounted on two brackets and contains a sponge
rubber insert for noise reduction; The left bracket is mounted·
to the space bar key lever by two screws. An equalizing rod
20
fits into the U-slot of the left bracket and passes through the
hole of the right bracket. This equal izing rod is mounted and
pivots in holes on t.he right and left side frames and its purpose
is to guide and support the space bar.
The spocebar key lever fulcrums about the key lever fulcrum
wire which passes through the key lever bearing support. A
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