IBM Selectric - Page 88

NOTE: Installing the platen and feed rolls, plus set-
ting the index selector lever in the double index posi-
tion, permits the overthrow adjustment to be measured
whi Ie the system operates under a load.
3.1 Clutch Latch Overthrow Late Style - Manually operate
the carrier return cam to the high point while observing
the motion of the clutch latch. It should overthrow the
latch ing surface of the keeper by .010" to .020" (Fig.
205.1). Adjust the carrier return latch arm adjusting
screw to obtain this condition.
FIGURE 205.1 Clutch Latch Overthrow Adjustment (Late Style)
4.
Clutch Latch Overthrow {15 inch machine
Use the followi ng procedure to obtai n the correct clutch
latch overthrow and operationa I latch height.
a.
vertical without binding against its interposer. Be
sure to tighten the Bristol screw in the lever onto
the flat portion of the pin.
b. Carrier Return Latch Arm Adjusting Screw (over-
throw) - With the carrier return cam on the high
point adjust the latch arm adjusting screw (Fig.
206) so that the clutch latch wi II overthrow the
latching surface of the keeper by .030" to .040
11
•
Be sure that the platen and feed rolls are installed
and the index selector lever is in the double index
position when checking this adjustment.
c. Carrier Return Latch Actuating Arm Adjusting
Screw (latch height) - With the carrier return cam
latched in the rest position, adjust the screw so
that the carrier return latch wi II pass under the
cam follower by .003
11
to .010" (Fig. 207). Main-
tain a clearance between carrier return latch arm
and torque bar.
Lever
/
/
\
Carri er Return Latch
\
.003" to
n
Cam Follower
--- -
Carrier Return Lever - Position the carrier return
lever (Fig. 206) laterally on the latch actuating
arm pin so that the carrier return latch wi II hang
FIGURE 207. Carrier Return Latch Height (15 Inch Machine)
Pivot Pin
Pin
should lie directly above
pivot pin without flat surface
Adjusting Screw
Carri er Return
~'----Latch Arm
Lever
Carrier Return
Latch
Actuating
Arm
FIGURE 206. CI utch Latch Overthrow Adjustment
(15 Inch Machine)
2-70
CAUTION: Any change in the carrier return
latch height directly affects the front to rear.. po-
sition of the latch (with respect to the cam follow-
er) when the machine is at rest. See adjustment
#4 in the Operational Control section.
NOTE: On a limited number of 15 inch machines
equipped with the early style carrier return mech-
anisrn, a carrier return latch actuating arm was
used that di d not have a flat surface machi ned
on the left end of its pivot pin. These ea.rly pro-
duction latch actuating arms should be replaced,
before attempting to make the carri er return adjust-
ment. The flat surface machi ned on the left end
of the pin is required to establish the proper radial
position of the carrier return lever on the pin
(with respect to the latch actuating arm), and in-
sures that the carrier return lever cannot slip on
the pin.