Non-synchronous operation of an electronic copier

Details Non-synchronous operation of an electronic copier Non-synchronous operation of an electronic copier

1980-06-20

1982-06-01

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

3461531, 355 3R, 360 15, G03G 1500

Patent

active

043324630

ABSTRACT:
In an electronic copier of a type that includes a document scanner, a memory device and a printer, a complex servo system is generally used to provide phase synchronous operation between such copier components. In accordance with the present invention, methods and apparatus are provided wherein an electronic copier is operated in a "free running" mode without such phase synchronization. Specifically, in accordance with a disclosed embodiment of the invention, a composite information signal corresponding to an original document is stored in the memory device in the form of document information sandwiched by leading and trailing pilot signals. Upon playback, certain copier functions are so coordinated with the termination of the leading pilot signal that problems which would be expected in the absence of a servo system, such as image registration errors, are avoided.

REFERENCES:
patent: 3749833 (1973-07-01), Rait et al.
patent: 3867569 (1975-02-01), Watson
patent: 3914047 (1975-10-01), Hunt et al.
patent: 4019733 (1977-04-01), Montalto
patent: 4105324 (1978-08-01), Seil
patent: 4204725 (1980-05-01), Distefano et al.
patent: 4251153 (1981-02-01), Levine
patent: 4268159 (1981-05-01), Tashiro

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