IBM Selectric Reference Manual

cam follower at the high'point of the cam and the
platen removed, hold the typehead toward the rear
until it is restricted by the anvil and striker. The
rubber
roller should just touch the restoring cam
(Fig. 142). Adjust the eccentric, keeping the high
point forward, to satisfy the condition.
Striker Against Anvil
FIGURE
142. Restoring Cam Follower Eccentric Adjustment
NOTE: If the roller is too close to the restoring
cam, it may bind against the cam during print shaft
rotation. If too much clearance exists, the type-
head may not be restored as quickly as it should
and blurred characters may result.
Carrier Support -,
(Anvil)
"
.001 II To .004"
t
t
FIGURE 142.1 Carrier Support (Long Carriage Machines)
The support is secured to the machine power frame by
two
binding screws at each end. Elongated holes in the
machine power frame enables the support to be adjusted
vertically. This adjustment serves the same purpose as
the carrier buffers on the early level machines.
10. Even Printing - Position the yoke under its mounting
screws so
that the density of the left and right sides of a
printed character will be uniform.
7.
Print Cam Follower Stop Screw - Adjust the cam follower
stop screw so that the print cam follower roller clears the
print cam by .020" when the machine is at rest (Fig.
142.2) •. This clearance ensures that the rocker will re-
st~re fully on every cycle. On dual velocity machines,
this clearance allows the roller to shift from one lobe to
the other without rubbing on the cam. Use the follow-
ing procedure to obtain this adjustment:
6.
CAUTION: This adjustment affects the tilt ring homing
adjustment, the typehead homing adjustment, and the
detent cam and actuating lever adjustments (skirt clear-
ance). Be sure to check these after changing the P9si-
tion of the yoke.
PRINT MECHANISM - LATE STYLE
Adjustments Orie through' five remain exactly the same as
they appear on the early style print mechanism. After
completing these five adjustments, begin here with ad-
justment number six.
Carrier Support (long carriage machines) - Adjust both
ends of the support vertically to maintain .001" to .004"
clearance with the bottom of the ribbon feed bracket
along the entire length of the writing line (Fig. 142.1).
2-46
--j
.-_1 __ -
I 1 \
'- I I \j
I I \
I I j
I r 1
.---u----II....,..!~ _ J
.020
11
Stop Screw
FIGURE 142.2 Print Cam Follower Stop Screw

IBM Selectric Specifications

General

Type	Electric typewriter
Introduced	1961
Keyboard Layout	QWERTY
Carriage Return	Electric
Manufacturer	IBM
Printing Technology	Typeball (golf ball)
Power Source	AC Power
Power Supply	120V AC