IBM Selectric Reference Manual

10.
11.
Tab Lever Overthrow Stop (Fig. 242.6) - Adjust for-
ward or back so that .005" to .015" clearance exists
between the lug of the tab lever and the overthrow stop
when the tab I ever is latched to the rear.
. 005
11
to . 015"
Tab Lever
FIGURE
242.6 Tab Lever Overthrow Stop (Early)
Carrier Return/Tab Interlock (~ig. 242.7) - With the
carri er return clutch latched, the upright lug of the tab
latch should clear the end of the tab lever pawl by .005
1l
to .025". The rear lug of the tab la'tch should be formed
forward
or back to obtain this condition.
-If·005I1to
_ " .025
11
~~"i
\ /
" /
'') - ....
f Escapement
Torque Bar
FIGURE 242.7. Interlock
The lug on the tab latch may be formed by using the
push end of the large spri ng hook as aT-bender.
The adjustment insures that the carrier return and tab
cannot both be latched simultaneously. If both were
allowed to latch, the tab lever pawl would lock against
a set tab stop during the carri er return operation.
12 • Tab Interlock Contact
a. Form (in circled area) the actuating Wire (left or
right) so
that it contacts the actuating arm near the
right ang Ie bend (Fig. 243).
b. With the tab interposer released and the backspace
cam on its high point, position the mounting brack-
et (front to rear) so that the actuating arm overlaps
(.040
11
minimum) the actuating wire (Fig. 243).
This insures that the actuating wire does not get
above the actuating arm.
2-81
Actuating L
(Tab Torque Bar)
Actuating Ann Contacts
Actuating Wire In The
Area Ci rei ed
1.
t
Overlaps /
.040" Min. (
\
I
~ Actuating Wire
Contact
(Form In This Area)
Mtg. Bracket
(Front To Rear Adj.)
FIGURE 243. Interlock Contact
c. As the tab torque bar restores, positi on the mount-
ing bracket (up or down) so that the contact actu-
ating wire travels .031" to .06211 after the contact
transfers (Fig. 244). This is done to insure that
machine vibration does not cause the contact to
transfer.
Transfer Here
Actuati Arm
Mtg. Bracket
FIGLJRE 244. Interlock Contact
Tab Torque
Bar
NOTE: During initiation of a tab operation, the
switch must transfer (up position) before the back-
space cam reaches its high point. Torque bar
bounce must not retransfer the contact whi Ie the tab
lever is latched out.
MARGIN CONTROL MECHANISM
Margin Rack Overbank Guide - With the carrier restin~
at the left hand margi n, adjust the overbank gui de (Fig.
245) left or right on the margin rack to obtain .001" to
.005
11
clearance between the margin stop and the margin
stop latch on the carrier when the margin rack is in its
rest
position (Fig. 245). When observing this clearance
remove the floating action of the margin stop latch by
pulling the stop latch to the right with a spring hook.

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