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Platen Retaining Plate
Figure 29. Carriage Parts
them from falling out when the truck is removed from the ma-
chine. Early truck rollers used nylon retainers that snapped
into recesses in the truck. The ten tooth star whee I is pinned
into the truck. Motion of the teeth on the carriage bed rotates
the star wheel, which also meshes with similar teeth on the
rail, and the star wheel moves the truck assembly. The car-
riage moves at a ratio of 2: 1 with respect to the truck assembly.
The bottom of each carriage end plate has an extension that
strikes the carriage fina I stop, mounted underneath the front
rail, when the carriage is moved beyond the left or right mar-
gin stops. The carriage final stop may be depressed against
a spring load when carriage removal is desired. Carriage re-
moval is made possible, without disturbing rail adjustments,
as the carriage ways and rails have milled teeth their full
length (Fig. 31). The front and rear rails are mounted on the
power frame casting.
Starwheel meshes with teeth
I_
on top of the carriage way
~
__
~_.----
... , ""w
(}i--~;
-~~--~-
Starwheel meshes with t8eth
on boHom of the ra
iI
Figure 30. Carriage Truck Assembly
13
Carriage motion is involved in many operations of the machine.
Typing, space bor and tabulation cause carriage motion to the
left. Carriage return,and backspace cause carriage motion to
the right. Hand carriage release can be used by the operator
to move the carriage in either direction. To do this, the
operator depresses the left or right carriage release button and
moves the carriage whi Ie holding down on the button. The
button rotates the carriage release lever, which is mounted
on a stud on the carriage end plate (Fig. 28). The lever pushes
the carriage universal bar toward the rear of the machine. The
universal bar runs the full length of the carriage and is mount-
ed to the carriage end plates. The universal bar contacts an
upri ght I ug of the pawl re lease lever (Fi g. 32). The pawl
release lever is mounted to the rear rail by an eccentric and
screw. It has a lug which extends behind the rear rail and
actuates the backspace inter lock. I t has another I ug under-
neath the rai I that rests between the escapement pawl and the
escapement rack. This lug pulls the pawl from the rack when
the pawl release lever is rotated. Release of the carriage re-
lease button and restoration of all release parts to rest allows
the pawl to return to the rack.
The other parts on the carriage, such as paper feed parts, tab,
margin and escapement racks are covered under their respective
sections. The rear rai I provides the mounting for many parts
that control carriage motion and position. These will alsobe
covered under their respective mechanisms.
The number of truck assemblies, writing line and paper size
vary with carriage length in accordance with the following
.chart.
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