Daisy wheel printer having low mass carriage

Typewriting machines – Including type-set-assemblage mounted on carrier and... – Including type-faces movable relative to type-face-carrier

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101 9319, 400903, B41J 130

Patent

active

044405120

ABSTRACT:
A daisy wheel printer with a low mass carriage is driven by a pair of bidirectional stepping motors mounted on the printer frame. The carriage and print wheel are each driven by their respective motor through a belt and pulley drive extending side to side of the printer frame. The motors and pulleys are proportioned so that a step of either stepping motor rotates the print wheel from one character position to the next, thereby synchronizing print wheel rotation with carriage movement. The motors are driven independently, under control of a microcomputer in the printer, to vary the phase of rotation of the print wheel relative to movement of the carriage. Stops at one end of the printer frame are used to physically position the carriage and wheel to known initial locations. The microcomputer is programmed to electrically synchronize the motor controls to such locations and to track the positions of the print wheel and carriage when moving them from their initial locations, without using extrinsic position-sensing and control circuitry. The printer has a platen mounted on a rack which is pivotable by rotatable cams away from the print wheel to ease removal of the wheel and to optimally adjust the platen-to-wheel spacing for printing on papers of different thicknesses.

REFERENCES:
patent: 3542182 (1970-11-01), Langenberger
patent: 3651916 (1972-03-01), Becchi
patent: 3698529 (1972-10-01), Cattaneo
patent: 3760925 (1973-09-01), Bossi
patent: 3773161 (1973-11-01), Bossi
patent: 3908809 (1975-09-01), Beattie
patent: 4044880 (1977-08-01), Martin
patent: 4101006 (1978-07-01), Jensen et al.
patent: 4145739 (1979-03-01), Dunning et al.
patent: 4245917 (1981-01-01), Mosciatti et al.
Hewlett-Packard Journal, vol. 27, No. 10, pp. 19-33, Jun. 1976, by R. B. Bump, 400-144.2.

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