IBM Selectric I/O Manual Of Instruction page 66

Each operational cam has a contact acfuating cam attached
to it. Each cam has its own follower and actuating linkage.
{Fig. 127.4}
Actuating Cam
• FIGURE 127.4 Operational Cam And Actuating Cam
When an operational interposer is tripped, it will move rear-
ward. The tai I of the interposer follower will follow the
interposer rearward under the load of the latch spring. The
actuator latch wi II move down out of the path of the actuator.
The actuator is sti II held depressed {rearward} by the actuating
bail. (Fig. 127.5)
• FIGURE 127.5 Contact Latch Operation
•
50.2
When the operational interposer is tripped, the operational
cam will begin to rotate. The actuating cam follower will
go to the low dwell of actuating cam {Fig. 127.3}. The
operating link will move downward, pivoting the actuating
arm. The rear of the actuating arm will move upward. This
will pivot the actuating bail away fromthe contact block
assembly and permit the actuators to move toward the front of
the machine. Only the unlatched actuator will move far
enough to transfer the contacts. The remainder of the actua-
tors wi II be held by their respective latches. As the opera-
tional cam continues to rotate, the cam follower will be
driven upward by the
hi~h
dwell of the actuating cam. This
will pivot the actuating bai I rearward and depress the actua-
tor rearward into the contact block. The interposer will be
driven forward and latched during the early part of the cycle.
The interposer follower wi II be driven to its rest position by
the interposer. This wi II leave the actuator latch under spring
tension to snap in front of the actuator as the actuator is
driven rearward by the actuator bai I (Fi g. 127.6).
Interposer
Follower
Follower
Mounting
Shaft Acts
As Latch
Stop
Interposer
FIGURE 127.6 Contact Latch Operation