IBM Selectric - Page 74

FIGURE 159A. Tab Latch Height
Adjusting Screw
Spacebar I Backspace
Or Tab Operational
Latch
Cam
Follower
.005
11
to .015
11
Spacebar
.003 II to .0 15 II
~
•
FIGURE 159B. Latch Height
3. Operational Latch Height - The adjustable latch screws
(eccentric stop on tab latch Fig. 159A) for the backspace,
spacebar, and tab operational latches should be ad justed
so
that the latches wi II pass under the cam follower lever
with a clearance of .003
11
to .015
11
(Fig. 159B). The car-
rier return operational latch adjustable stop should be ad-
justed so that the latch wi II pass under the cam follower
with.003
11
to .010
11
clearance (Fig. 160).
Be Sure Cam
Is At Rest
Cam Follower Lever
~--- Carri er Return
Latch Assembly
.
003
11
to .010
11
~
-r For 15" See Carrier
Return Adjustments
FIGURE 160. latch Height (11 Inch)
NOTE: Be sure that the cams are at rest when this
clearance is observed. The high side of the specifica-
tion is preferred.
2-56
NOTE: The clearances may be observed by pulling the
latches to the rear with a spring hook whi Ie the machine
is at rest.
4. Interposer Adjustlng Screws - Adjust the interposer adjust-
ing screws so that a front to rear clearance of .015
11
to
.020
11
exists between all the operational latches and their
respective cam followers, with the exception of the
spacebar latch. The spacebar latch should have a clear-
ance of .025
11
to .035" (Fig. 161).
Cam Follower
I~
• 0 15 II to .020"
Backspace
.025" to .035"
FIGURE 161.
Interposer Adjusting Screw
NOTE: Machines which have the carrier return latch-
spring loaded to the rear (under the cam follower) shou Id
be adjusted as follows:
a. Hold the carrier return latch to the front against its
interposer. (The interposer should be latched at rest) .
b. Adjust the interposer adjusting screw for .035" to
.045" between the latch and cam follower.
c. Release the interposer and proceed with the next
adjustment.
NOTE: The operational interposer springs should be
placed in the center hole at the rear of the interposer.
(Fig. 164).
The adjustment directly affects the timing between the
cam release and the positioning of the operational
latches under the cam follower. Excessive clearance
can allow the cam follower to move down at the rear
before the latch has moved fu Ily under the follower.
The adjustment may be checked after operating the
cams enough to move the cam followers down slightly
at the rear. With the machine on its back the latches
can be pushed against the cam followers to estimate the
clearance •
All of the operational interposer springs should be
placed in the middle hole at the rear of the interposer.
CAUTION: If the cam followers are operated too far
when this adjustment is being checked, the interposer
restoring bail will force the interposers forward slightly
and an erroneous adjustment wi II result. The keylever
pawl to interposer clearance should be rechecked after
this adjustment.