Print wheel control

Details Print wheel control Print wheel control

1976-05-17

1978-03-14

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101110, 250233, B41J 132

Patent

active

040784851

ABSTRACT:
A control system for operating a single high-speed print wheel is disclosed. The control system includes a print wheel drive motor having a coded disc with transparent portions forming a four-level Gray code for indicating the position of the print wheel. An optical and electronic system is used for positioning the print wheel and also for the purpose of providing an electronic detent which uses the motive power of the print wheel drive for holding the print wheel in selected printing positions. A similar optical and electronic system is used for controlling a paper advance mechanism. The disclosed system also includes a print hammer with a voice coil type drive to permit positive, bidirectional hammer control.

REFERENCES:
patent: 3110251 (1963-11-01), Scheffel
patent: 3158090 (1964-11-01), Wasserman
patent: 3440955 (1969-04-01), Howard et al.
patent: 3566782 (1971-03-01), Kocher
patent: 3741112 (1973-06-01), Cayla
patent: 3807300 (1974-04-01), Brooks et al.
patent: 3901371 (1975-08-01), Scott

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