Multiple shift electronic keyboard

Details Multiple shift electronic keyboard Multiple shift electronic keyboard

1977-07-28

1978-10-17

Robinson, Thomas A.

Telegraphy

Systems

Automatic

178 81, 340365S, 400253, B41J 2524, H04L 1506

Patent

active

041210484

ABSTRACT:
A full-roll electronic keyboard having upper and lower case capabilities is disclosed. The keyboard includes a shift key which when depressed will generate first and second coded signals with the first signal utilized to indicate the start of a shift operation. Upon release of the shift key, the first and second coded signals are again generated with the first signal again being used to indicate the end of a shift operation. The first coded signals generated by the movement of the shift key informs a processing unit that any character key on the keyboard depressed between the generation of the two first coded signals will be shifted from the lower to the upper case. The shift key circuit includes an inverter which is utilized in the generation of the first and second coded signals upon the operation of the shift key.

REFERENCES:
patent: 3846758 (1974-11-01), Gosset

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