Photocopying – Including fiber optics
Patent
1977-12-30
1979-01-09
Moses, Richard L.
Photocopying
Including fiber optics
96 1C, 355 14, 355 15, 361225, G03G 1500
Patent
active
041336100
ABSTRACT:
An electrophotographic machine of the transfer type in which tetrafluoroethylene-coated carrier beads transport toner particles to a development zone by virute of the triboelectric attraction between positive toner and negative tetrafluoroethylene. At the development zone, the carrier beads are crushed together and occasionally a piece of tetrafluoroethylene is worn off of the surface of the beads and carried along on the surface of the photoconductor. These tetrafluoroethylene-wear products are subjected to high level preclean corona current to reverse the triboelectric negative polarity thereof. In that manner, a positive wear product is made to act as though it was toner and is therefore carried out of the machine on copy paper. In a similar manner, paper dust and other contaminants on the photoconductor surface are subjected to a high level preclean corona current to receive a positive charge for being carried out of the machine on the copy paper.
REFERENCES:
patent: 3348523 (1967-10-01), Davidson et al.
patent: 3884572 (1975-05-01), Bacon et al.
patent: 3950680 (1976-04-01), Michaels et al.
patent: 4039257 (1977-08-01), Connolly
Bernardelli William J.
Caudill Allison H.
Thompson John A.
International Business Machines - Corporation
Moses Richard L.
Rohrer Charles E.
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