Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1976-11-08
1980-06-03
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
118652, 355 3CH, 355 3TR, G03G 2100
Patent
active
042059127
ABSTRACT:
An electrophotographic apparatus includes a photoconductive drum capable of rotating at least two rotations during a series of copying processes, a first charging device for charging the surface of the drum in a negative polarity, a first exposing device, a development device having a magnetic brush unit, and a second charging device for transferring image. A second exposing device is provided to expose the entire surface of the photoconductive drum together with the residual toner after the image transfer process during the second rotation of the photoconductive drum. A third charging device is provided to supply positive charges to the surface of the drum and the residual toner after the second exposure. The residual toner is removed from the photoconductive drum by the above described magnetic brush unit charged in the same negative polarity with that of the first charging device and the image transfer device.
REFERENCES:
patent: 3637306 (1972-01-01), Cooper
patent: 3647293 (1972-03-01), Queener
patent: 3789223 (1974-01-01), Sato
patent: 3879785 (1975-04-01), Roth et al.
patent: 3914045 (1975-10-01), Namiki et al.
patent: 3918808 (1975-11-01), Narita
patent: 4077711 (1978-03-01), Akamatsu
Abbott et al.; "Xerographic System," IBM Technical Disclosure Bulletin, vol. 16, No. 9, Feb. 1974, p. 2958.
Noto, Fedele A.; "Copier with Single Corona Generating Device," Xerox Disclosure Journal, vol. 1, No. 2, Feb. 1976, p. 93.
Baba Mamoru
Inoue Tetsuo
Koyama Mitsuaki
Yamaguchi Yasuhiro
Braun Fred L.
Tokyo Shibaura Electric Company Limited
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