IBM Selectric I/O Manual Of Instruction page 84

Adjusting Plate
Latch Stop
FIGURE 165. Power-Tab Latch
The tab operational latch is connected to the latch bell-
crank and, as the latch is carried down by the backspace/
spacebar cam-follower lever, the bellcrank rotates clockwise
(Fig. 165).
A link connects the tab torque bar to the latch bellcrank
(Fig. 165). Rotating the bellcrank, raises the link. The link
rotates the bottom of the torque bar to the rear.
The tab torque bar is mounted the same as the escapement
torque bar. The pivot point is near the top of the torque bar
so that the bar swings to the rear.
Late Style - Tab Operational Mechanism - 731
The tab torque bar actuating mechanism on 11 inch machines
has been redesigned to be compatible with the late style car-
rier return mechanism. The parts which transmit motion up to
the torque bar are brought out in front of the center section of
the power frame. The right-hand dust shield has been redesign-
ed so as not to interfere with the mechanism.
The tab operational latch is connected to the tab lever arm and
bearing assembly. As the latch is carried down by the cam fol-
rower, the tab lever arm rotates in a counterclockwise direc-
tion, pushing up on the tab link (Fig. 165.1). The link con-
nects to the tab bellcrank assembly, rotating it in a clockwise
direction. An adjusting screw connects the tab bellcrank to an
extension of the tab torque bar and as the right end of the bell-
crank moves down the bottom of the tab torque bar is rotated to
the rear. The remainder of the tab operation is unchanged.
• FIGURE 165.1 Late Level Tab Operational Mechanism
(11 Inch Mach ine)
Early Level
A small flat spring attached to the left rear corner of the es-
capement bracket braces the torque bar to prevent it from
flexing toward the front.
Lever Here
Backspace Pawl
Escapement Pawl
FIGURE 166. Pawl-Release Operation (Early)
66