Typewriting machines – Carriage or carriage-moving or movement-regulating mechanism – Carriage-feed mechanism
Patent
1982-11-12
1985-02-19
Sewell, Paul T.
Typewriting machines
Carriage or carriage-moving or movement-regulating mechanism
Carriage-feed mechanism
400322, 400328, 400314, 400617, 400693, B41J 1930, B41J 2530, B41J 2902
Patent
active
045002177
ABSTRACT:
An electronic printer mechanism having a movable printhead assembly , wherein the printhead is a matrix of selectively heatable semiconductor mesas for producing dot matrix characters one line at a time on a paper medium. The electronic printer mechanism is constructed with a sectional housing including upper and lower housing sections which are releasably secured together to define an interior chamber for receiving components of the electronic printer. The lower housing section is provided with complementary sets of shaft-receiving recesses such that drop-in assembly of components with respect to the lower housing section as received in respective sets of the recesses prior to securement of the upper and lower housing sections together is accomplished. One component assembly comprises an operating shaft on which the printhead assembly including a carrier member fixedly supporting a printhead is mounted for transversing movement therealong. A gear train assembly driven by a rotary power shaft from a motor imparts rotation to the operating shaft and includes a timing control gear for sequentially stepping through the operating cycle of the printer and a paper-advancing gear arrangement. The paper-advancing gear arrangement relies upon a Geneva gear wheel to intermittently advance the paper one line for each periodic rotation of the Geneva gear wheel as the carrier member and printhead supported thereby complete a one line traverse along the rotating operating shaft.
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Comfort James T.
Hiller William E.
Sewell Paul T.
Sharp Melvin
Texas Instruments Incorporated
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