Keyboard actuator

Details Keyboard actuator Keyboard actuator

1981-10-13

1984-04-10

Sewell, Paul T.

Typewriting machines

Having fluid-pressure power drive

For type-face selection or choice

92 24, 400473, B41J 2322, F15B 1526

Patent

active

044418337

ABSTRACT:
A keyboard actuator for actuating the keys of a keyboard-operated apparatus including a plurality of fluid actuators supported by a frame, a first plurality of fluid conduits in communication with one or more selected fluid actuators, and first and second valve means for applying fluid pressure to selected ones of the first and second plurality of fluid conduits in response to signals from the control means. The fluid actuators include latching means and piston means. In response to fluid pressure, the latching means releases the piston means and the piston means may be driven to actuate a key of the keyboard-operated apparatus.

REFERENCES:
patent: 859843 (1907-07-01), Rogers
patent: 1772892 (1930-08-01), Green
patent: 2130618 (1938-09-01), Gnavi
patent: 2908251 (1959-10-01), Gratzmuller
patent: 3026985 (1962-03-01), Oxley et al.
patent: 3033171 (1962-05-01), Engelbrecht
patent: 3398651 (1968-08-01), Folmer
patent: 3889576 (1975-06-01), Sheffer

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