IBM Selectric Reference Manual

Latch Arm Assembly
Latch Height
Adjusting Screw
FIGURE
203.1 Carrier Return Latch Height (11 Inch Late Style~
1.2 Carrier Return Latch Height Late Style (15 Inch Machine)
a. Carrier Return Lever - Position the carrier return
lever laterally on the operational pivot pin. so that
the carrier return latch wi II hang vertical without
binding against its interposer (Fig. 203.2). Be sure
to
tighten the screw in the lever onto the flat por-
tion of the pin.
b. Carrier Return Latch Arm Assembly Adjusting Screw-
With the carrier return cam latched in the rest posi-
tion, adjust the screw so that the carrier return latch
will pass under the cam follower by .003" to .015"
(Fig. 203.2).
Latch Arm Adjusting Screw
.003" To .015"
L
t
FIGURE 203.2 Carrier Return Latch Height (15 Inch Late Style)
The latch height adjustment insures maximum throw
for
the latch and that it will movie under the cam
follower
freely.
2.
CAUT ION: Any change in carrier return latch
height directly affects the front to rear position of
the latch (with respect to the cam follower) when
the mach ine
is at rest. See Adjustment # 4 in the
operational control section.
Pawl Clearance - Adjust the clutch latch eccentric so
that the escapement pawl will clear the rack teeth by
.005" to .020" when the latch is being held down by the
keeper (Fig. 204).
.005" to .020"
Latch Held Down By Keeper
Eccentric
F I
GU RE 204. Pawl CI earance Adj ustment
This
adjustment insures that the escapement pawl will not
drag
along the rack during a carrier return and that the
pawl will be allowed to re-enter the rack quickly at the
completion of the return operation.
3. Clutch Latch Overthrow (11 inch machine only) - With
the platen and feed rolls installed and the index se-
lector lever set in the double index position, manually
operate the carrier return cam to the high point while
observing the motion of the clutch latch ~ It should
overthrow
the latching surface of the keeper by .0301\
to .040" (Fig • 205). Adjust the carrier return latch
arm adjusting screw to obtain this condition.
Adjusting Screw
ClearQnce
o
(Early Style)
FIGURE 205. Clutch Latch Overthrow Adjustment (11 Inch)
2-69

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