Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1983-03-02
1988-08-09
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
1525652, G03G 2100
Patent
active
047631686
ABSTRACT:
Apparatus for cleaning residual toner from a photoconductive surface. Toner is temporarily removed from the surface by a conductive fiber brush wherein it is stored for a period of time dependent on the image area coverage and the transfer efficiency of the transfer device used. When the brush reaches its toner holding capacity, the toner is deposited back onto the surface and it is transported to the development system where it is recycled back into the developer housing for reuse. In one embodiment, the brush initially has a d.c. voltage applied to it of a polarity so as to attract toner to the brush after which a d.c. voltage of the opposite polarity is applied to the brush in order to detone the brush and thereby deposite it on the photoconductive surface. A charging device of the printing apparatus has a switch for temporarily inactivating the charging device to allow repelled toner to pass thereby unaltered.
REFERENCES:
patent: 3617123 (1971-11-01), Emerson
patent: 3649263 (1972-03-01), Cade et al.
patent: 3728016 (1973-04-01), Harbour et al.
patent: 3780391 (1973-12-01), Leenhouts
patent: 4265990 (1981-05-01), Stolka et al.
patent: 4361922 (1982-12-01), Karal
Xerox copending U.S. application Ser. No. 438,227 filed Nov. 1, 1982 entitled "Cleaning Method & Apparatus for a Xerographic Reproducing Apparatus"; Bean et al.
Braun Fred L.
Xerox Corporation
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