IBM Selectric Manual

2. Escapement Torque Bar Stop
a. New Style - The torque bar stop located at the right
end of the torque bar should be adjusted for a rest
position clearance of . 008" to . 01 A" between the
torque barandthe lug on the escapement powl (Fig.
95) .
.008" To .010"
~
V
Torque Bar Stop
FIGURE 95. Torque Bar Stop (New Style)
b. Old Style - Form the torque bar stop located at the
left end of the torque bar so that a clearance of
.002" to .006" exists between the torque bar and
the lug on the escapement pow I (Fig. 96).
Form Stop To Obtain Clearance
Tab Rack
1------- Torque Bar
Escapement
Pawl
FIGURE 96. Torque Bar Stop (Old Style)
The escapement cam used with the new style escape-
ment mechanism provides greater available travel
for all escapement parts; therefore more clearance
is permissible and desirable between the torque bar
and the escapement pow I lug.
CAUTION: Make certain that the escapement trig-
ger does not prevent the escapement torque bar from
resting against the stop when making the torque bar
stop adjustment. Also, check the powl mounting
stud and, on long carriage machines, the torque
bar back stop. Neither one of these should be
touching the torque bar when the stop adjustment is
being made.
3.
4.
5.
36
Pawl Mounting Stud - Rotate the pawl mounting stud so
that it clears the escapement torque bar by .001" at the
closest point along the writing line (Fig. 97). Keep the
high port of the eccentric toward the left so that the I
force of the torque bar wi II tend to tighten the stud in-
stead of loosen it.
~! _____ .~e~r \
FIGURE 97. Pawl Mounting Stud Adjustment
Torque Bar Back Stop (long carriages only) - Adjust the
back stop forward or back on its mounting stud so that
there is a .001
11
to .005
11
clearance with the torque bar
{Fig. 98). _ _
/' "
/ "-
.OO5"l§- \1
~\~" •. ~/1
// ....... - - /'
.00111 To
FIGURE 98. Torque Bar Backstop
Pivot Pin Eccentric (found on early level machines only)
The eccentric collar should be adjusted with the high
point up so that it just touches the operational latch
bracket (Fig. 99). This prevents the pivot pin from
bowing during a print escapement operation. On long
carriage machines the eccentric should also be adjusted
laterally on the pivot pin so that the end play of the
pivot pin will be .00211 to .005
11
.
Carri er Return
Latch Arm
FIGURE 99.
Latch Bracket Assembly
Eccentric Should
Be Up And T ouch-
ing Latch Bracket
Pivot Pin Eccentric
(Early Level Machines Only)

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