IBM Selectric I/O Manual Of Instruction page 93

The front feed roll shaft rests in notches of the front feed roll
arms. The front feed roll arms pivot on the feed roll actua-
ting shaft. A heavy extension spring from each front feed roll
arm to the carriage tie rod supplies the pressure of the front
feed roll against the platen. Various holes in the feed roll
arms provide a means of adjusting the pressure.
The rear feed roll shaft rests in notches of the rear feed roll
arms. The rear feed roll arms pivot on studs at the front of
the paper feed mounting arms that extend forward from the
carriage tie rod (Fig. 189). A shoulder screw at each side
connects the rear feed roll arms to the front feed roll arms.
Pres~ure
of the rear feed rolls against the platen is supplied by
the front feed roll arms.
The paper deflector acts as a chute to guide the paper around
the platen (Fig. 187). It is supported beneath the platen by
the front and rear feed roll arms. A lug at each end of the
deflector fits over a stud on the paper feed mounting arm to
maintain the correct position of the deflector.
As the paper is inserted into the machine, an adjustable guide
mounted on the case at the rear of the platen serves to posi-
tion the paper for its left margin position. The paper deflec-
tor guides the paper between the rear feed roll and the platen.
As
the platen is turned, the paper is forced to move with the
platen. The deflector guides the paper around the platen in-
to position between the front feed roll and the platen.
As
the paper is fed farther, the end of the paper is guided up-
ward by the line gage card holder attached at the rear of the
carrier (Fig. 188). The line gage card holder assists in hold-
ing the typing material against the platen in the printing
area. A scale on each side of the holder assists the typist in
reinserting material into the machine to a specific printing
point. The marks on the scale indicate the middle of a char-
acter space and the horizontal edge on the scale indicates
the bottom of the writing line. A single mark in the middle
at the top of the card holder indicates the middle of the
next character to be typed.
Above the writing line the paper is engaged by two rubber
rollers mounted on the paper bai I. These rollers hold the
paper against the platen above the writing line so as to re-
duce the possibi lity of overprinting on the paper. The rollers
FIGURE 188A. Standard
FIGURE 188B. Pin Feed
FIGURE 188. line Gage Card Holder
74
a Iso feed the paper verti ca II y after the bottom of the paper
has left the front feed roll.
The paper bai I is supported by a lever at each end that pivots
front to rear on the side of the machine. A hairpin spring
operates each bai I lever as a togg Ie to hold the bai I rolls
either to the rear against the platen or forward in the re-
leased position.
The bai I rolls are free to rotate around the bai I shaft. A
spring band inside each bai I roll grips the bai I shaft to re-
strict the lateral motion of the bail rolls. The bail rolls may
be positioned along the bail shaft by exerting sufficient
pressure to overcome the friction of the spring band on the
bai I shaft.
Paper Release
The pressure of the front and rear feed rolls is released from
the platen to allow the operator to position the paper more ac-
curately and to allow easier insertion and removal of the pa-
per. Paper release is accomplished by pulling forward on the
paper release lever located at the right end of the carriage
(Fig. 189). The front of the paper release lever cams the top
of the feed roll release arm forward to rotate the feed roll
actuati ng shaft.
Paper Feed Braces
Feed Roll Release Arm
Lever
FIGURE 189. Paper Release Mechanism
Two feed roll re lease levers are clamped to the feed roll act-
uating shaft and rest behind a lug of each front feed roll arm.
As the shaft rotates, the feed roll re lease levers rotate the
front feed roll arms down, away from the platen. The rear
feed roll arms are, in turn, forced away from the platen by
thei r connecti on to the front feed roll arms. When the paper
release lever has been pulled all the way forward, the end of
the feed roll release arm detents over the point at the front of
the paper release lever to hold it in the released positi on.