Photocopying – Contact printing – Light boxes
Patent
1991-01-31
1992-06-02
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
G03G 1516
Patent
active
051191415
ABSTRACT:
An electrically biased attracter roller is utilized in an electrophotographic image reproduction machine, in place of a conventional corotron device, to electrically transfer toner from the side of a rotating photoconductor drum onto a side surface of paper stock being operatively fed through the machine. The charged roller is spring-biased into forcible side-to-side engagement with the drum and is frictionally rotated by the drum. The paper stock is fed between the rotating roller and drum and, by a combination of pressure and electrical attractive force, the roller very efficiently transfers toner from the drum to the paper. To further improve the overall effectiveness of the attracter roller, a humidity compensation system is provided and is operative to automatically adjust the bias voltage of the roller, and thus the electrical toner attraction force thereof, in response to sensed humidity variations within the machine housing.
REFERENCES:
patent: 3924943 (1975-12-01), Fletcher
patent: 4338017 (1982-07-01), Nishikawa
patent: 4382673 (1983-05-01), Nakajima et al.
patent: 4947215 (1990-08-01), Chuang
Compaq Computer Corporation
Pendegrass Joan H.
Stanzione Patrick J.
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