IBM Selectric I/O Manual Of Instruction page 28

FIGURE 55. Lockout Lever - Solenoid Energized
shows the lever installed to lock the keyboard with the sole-
noid energized. Figure 56 shows the lever installed to lock
the keyboard with the solenoid de-energized.
Bai I Roller
Lock-out Lever
Solenoid
FIGURE 56. Lockout Lever - Solenoid De-energized
Keyboard Lock Bail
A bail is installed in the "Selectric" I/O Printer to provide a
means of locking the various functions. The bail is operated
by the lockout lever and as the bai I is rotated to the front of,
the pri nter, three
Ii
nks and a s
Ii
de assemb Iy fastened to the
bail cause the following (Fig. 57A). It L k
n erposer oc
Shift Lock Link
~,:-_
Slide Assembly
~~,~
Spring
Lockout Comb
FI GURE 57 A. Keyboard Lock Mechanism (Late)
21
1. The functional key levers are locked.
2. The keyboard lock contact is operated.
3. All 44 character interposers are locked.
4.
The machine wi II be returned to lower case if it is locked
in upper case.
5. Cycle clutch pawl is locked.
Functi ona I Keylevers
The functional keylevers are locked by the link on the right
end of the bai I. The link is fastened to the bai I by an adjust-
able clamp. The end of the link that extends to the front,
fastens to a be Ilcrank. The be Ilcrank pivots around the screw
that mounts it to the keylever support. As the link moves to-
ward the front, the be IIcrank is rotated in a counterc lockwise
direction. The arm on the bellcrank, that extends to the
front, moves to the right. The be IIcrank a lIows the lockout
comb to move to the right under its spring tension (Fig. 57 A).
The lugs on the comb move under their keylevers to prevent
them from being depressed.
Shift Lock link
Lockout Lever
Contact
FIGURE 57B. Keyboard Lock Mechanism{Early)
Spacebar
Because the spacebar does not operate a key lever and cannot
be locked with the comb, a lock collar is fastened to the
space-bar shaft. When the keyboard lock be Ilcrank rotates
I
the arm on the bellcrank moves to the right under the step on
the spacebar lock collar. This prevents the spacebar from
being depressed (Fig. 58).
Lock Collar
FIGURE 58. Spacebar Lock Collar