Photocopying – Contact printing – Light boxes
Patent
1990-09-06
1991-11-19
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355269, 430125, G03G 1506
Patent
active
050669893
ABSTRACT:
A cleaning method is provided for use in a color electrophotographic apparatus in which color toner images formed by using a plurality of color toners on a photosensitive medium by repeating charging, exposure and reverse-developing steps are transferred to a sheet of paper at one stroke. The toners include color toners and a black toner. Each of the color toners is a toner for a DC electric field jump developing method which serves to develop without making contact with the photosensitive medium. The black toner is a toner for a two-component magnetic brush developer which is mixed with a carrier to be used. The two-component magnetic brush developer is used both as a developer serving to develop in contract with the photosensitive medium and a cleaning agent serving to clean the toners remaining on the photosensitive medium after the transfer operation. Further, the color toners and black toner are charged, when mixed with the two-component magnetic brush developer, to have a polarity which is the same as the polarity thereof at the time of developing.
REFERENCES:
patent: 4502780 (1985-03-01), Suzuki et al.
patent: 4827869 (1989-04-01), Takagi
patent: 4868608 (1989-09-01), Allen et al.
Grimley A. T.
Matsushita Electric - Industrial Co., Ltd.
Stanzione P. J.
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