Electrostatic detack apparatus and method

Details Electrostatic detack apparatus and method Electrostatic detack apparatus and method

1982-06-07

1984-05-22

Prescott, A. C.

Photocopying

Including fiber optics

355 3CH, 355 14CH, 250324, 250325, 361229, 361230, 430 35, G03G 1500

Patent

active

044498080

ABSTRACT:
In a xerographic reproduction machine there is provided apparatus for partially neutralizing charge on the backside of a copy sheet electrostatically adhered to a photoconductive surface. Included in the apparatus is a conductive wire having a relatively thick insulative outer coating which is sufficiently thick that with an a.c. voltage applied to the conductive wire there is substantially no net d.c. current flow from the wire in the absence of an external electrostatic field. Such a construction of wire and outer coating is known as a dicorotron electrode. A net positive current flows from the wire to the back of the paper when an external electrostatic field is established between the conductive shield and the copy sheet by moving said copy sheet with a positive voltage on its backside past the conductive wire. A resistor connecting a conductive shield positioned to the side of the conductive wire opposite the backside of the copy sheet establishes a bias voltage for the shield as a result of current flow from the conductive wire to the shield and through the resistor.

REFERENCES:
patent: 2836725 (1958-05-01), Vyverberg
patent: 2879395 (1959-03-01), Walkup
patent: 3396308 (1968-08-01), Whitmore
patent: 3813548 (1974-05-01), Silverberg
patent: 3921042 (1975-11-01), Shenoy
patent: 3996466 (1976-12-01), Davis
patent: 4086650 (1978-04-01), Davis et al.
patent: 4112299 (1978-09-01), Davis
patent: 4190348 (1980-02-01), Friday
patent: 4265990 (1981-05-01), Stolka et al.

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