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(Operation)
The right margin stop contacts the large flat portion on the
right end of the margin control lever (Fig. 26). The margin
control lever is mounted to the tab lever assembly by means
of elongated slots that allows-left to i'ighf motion of the lever.
The margin stop moves the margin control leyer to the left. A
lug on the left end of the margin control lever contacts the up-
per line lock bellcrank which is mounted by a shoulder rivet
to the tab horseshoe bracket. The upper bellcrank rotates,
pushing down the vertical line lock link which lowers the hori-
zontal arm of the lower line lockbellcrank. The lower bell-
crank, whicb is mounted to the left side frame, rotates and
moves the push rod toward the front of the machine.
The
front
end of the push rod contacts the left end of the key lever lock-
ing bar and moves it. under the tab and letter key levers (Fig.
27)
The carriage return keylock is not moved during line lock.
This leaves carriage return unlocked, and is done to permit
the carriage to be returned to the next writing line.
lock Bar Fulcrum Wire
paper as the typewriter is operated. The paper is guided
around the ploten by the deflector, and held against the platen
- by the feed rolls. The feed rolls are mounted to the inner
carriage,arid will be covered in detail under "pAPER FEED".
Theinrie;carriagecontrols th¢ front. to rear position of the
platen and is
moye~
by the multiple copy control lever)Fig.
28}. This
leverrotOtesa~haft,
called the platen guide shaft.
This shaft includes ecceritrit.'collars that
work
against parts
mounted to the outer carriage "cmd cams the entire inner car":
riage forward or backward. Th.e firsf three positions move the
carriage less than the last two, affording a finer initial adjust-
ment. The inner carriage co~sists of the following (Fig. 29):
left and' right platen guide plates, platen- g!Jide shaft, fel;ld
roll release camshaft, paper bai/pivot shaft and the paper
table tie-rod. Other parts on the inner c\Jrriage wi II be
c:;overed under their respective mechanisms. The_ platen_guide
plates cire mounte.d to the outer carriage in a manner thcit allows
them to move front to rear. They are spring-loaded to the rear
to eliminate any play. The left platen guide plate has one
extra bearing point o,n the outer carriage to obtain additional
stability for the line space mechan-ism. Earlier machines used
a carriage side frame eccentric nut as a third bearing point for
the guide plates, and the plates were not spring loaded.
Paper Release
lever
Figure 27. Une Locking Bar
Eccentric Collar
The operation of margin release lowers the rrorgin control
lever and allows it to restore to the right, due to the tension
of the tab check lever spring, and assume its rest position.
The spring load on the key lever locking bar restores the line
lock mechanism to its rest position. Moving the carriage to
the right a Iso permits the margin control lever to return to its
rest position and this, in ;turn, allows the restoration of a11
line lock parts.
The letter key levers can
be
locked by the key lever locking'
bar in one of two positions. When the kElY lever is in the rest
position, the locking bar moves underneath a locking lug on the
key lever, and prevents the depression of any key lever. Should
the operator have a key lever depressed as the line lock is
actuated, the locking bar wi II move over the lop of the lock-
ing lug and the key lever will be locked in the depressed po"-
sition. One piece repeat/non repeat key levers are made
without a locking lug to prevent their being locked in the de-
pressed, or operating position'. This feature prevents possible
damage to the paper from continued repeat action at the right
margin.
CARRIAGE AN D RAILS
The basic purpose of the carriage is to support aR.d position the
12
Figure 28. Multiple Copy Control
The vertical motion of the platen is eliminated by the platen
latches that
~otate
over the top of each platen bushing and
hold the bushing down against the end plates of the outer car-
riage {Fig. 29}., The outer carriage consists of the carriage
bed, and the two carriage end plates. These parts are welded
together to -form a bax-type carripge' construction that gives
maximum rigidity to the carriage.
The carriage bed nas two rows of milled teeth running its full
length. These provide motion for the rotation of the staw
wheels in the plastic truck assemblies (Fig. 30). Each truck
coritains four steel rollers that engage the carriage ways and
the rai Is to allow,free motion of the carriage to the left and
right. The truck rollersfit into holes in the truck housing.
These holes have smalt bosses that retain the rollers and keep
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