Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1982-12-10
1985-02-19
Prescott, A. C.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 3DD, 355 15, 430125, G03G 1508
Patent
active
045001987
ABSTRACT:
A two-cycle xerographic device having a multiple-roller magnetic brush developer which sequentially develops and then cleans the device's reusable photoconductor. The photoconductor provides one or more image panels for each revolution of the photoconductor. The photoconductor's interimage area, which separates the trailing edge of one panel from the leading edge of the same panel, or the leading edge of the next panel, is smaller (as measured in the direction of photoconductor movement) than the similar dimension spanned by the developer's spaced multiple rollers. As the panel's trailing edge leaves the first to-be-encountered roller, that roller's development electrode bias voltage is switched from a development to a cleaning bias. This switching function occurs sequentially, from one roller to the next, thus facilitating a small interimage area, and maximum photoconductor usage.
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IBM Technical Disclosure Bulletin, vol. 24, No. 7B, Dec. 1981, "Magnetic Brush Xerographic Development", by J. E. Bierschbach et al., pp. 3782-3784.
IBM Technical Disclosure Bulletin, vol. 23, No. 11, Apr. 1981, "Independent Biasing within Development Zone", by L. D. Witcher, pp. 5103-5104.
International Business Machines - Corporation
Prescott A. C.
Sirr Francis A.
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