Typewriting machines – Key-board or key lever-actuating mechanism – Including means generating a signal for type selecting or...
Patent
1979-03-02
1981-01-27
Wright, Jr., Ernest T.
Typewriting machines
Key-board or key lever-actuating mechanism
Including means generating a signal for type selecting or...
400478, 340365P, B41J 508
Patent
active
042472113
ABSTRACT:
An optically coded keyboard arrangement has a plurality of key units arranged to be individually actuated; an actuation sensing arrangement that includes a plurality of light emitters generating light beams and a plurality of detectors each placed in the path of a respective light beam. Each key unit includes a key arranged to be depressed and a coded mask coupled to the key for movement with the key in unison upon displacement of the key and for movement relative to the key in a direction transverse to the path of motion of the key. Each key unit further has a switching spring which, in the position of rest of the associated key has an arcuate shape bulging in one direction and engages at one end a countersupport. As the key is depressed, the switching spring is deformed into a more bulging shape, carrying the mask into a position where it is ready to interrupt the light beams. Upon continuing movement of the key by virtue of the depressing force, a cam causes the tensioned switching spring to jump off the countersupport, whereupon the spring, as it assumes a released state, rapidly moves the mask into the light beam paths.
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patent: 4159183 (1979-06-01), Johannsen
Behrendt Wolfgang
Bohnhage Detlef
Friedemann Peter
Frolich Bernhard
Orzessek Reinhold
Olympia Werke AG
Wright, Jr. Ernest T.
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