Keyboard employing photoelectric key actuation sensing

Details Keyboard employing photoelectric key actuation sensing Keyboard employing photoelectric key actuation sensing

1977-11-02

1979-06-26

Wright, Jr., Ernest T.

Typewriting machines

Key-board or key lever-actuating mechanism

Including means generating a signal for type selecting or...

400496, 400490, 235145R, 340365P, 400478, 178 17D, B41J 508

Patent

active

041591836

ABSTRACT:
In a key-operated machine in which actuation of a key moves code elements of an associated code card into the path of a photoelectric sensing system, each code card is moved by a drive mechanism so as to cause the code elements to traverse the sensing system path only once, and at a speed which is independent of the speed of key movement, in response to each key actuation.

REFERENCES:
patent: 3017463 (1962-01-01), Dinsmore et al.
patent: 3495239 (1970-02-01), Glorioso et al.
patent: 3579047 (1971-05-01), Sturm et al.
patent: 3609713 (1971-09-01), Wooton et al.
patent: 3617627 (1971-11-01), McLean
patent: 3633723 (1972-01-01), Kosters
patent: 3750150 (1973-07-01), Cramer et al.
patent: 3767022 (1973-10-01), Olson
patent: 3777155 (1973-12-01), Cramer et al.

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