Photocopying – Contact printing – Light boxes
Patent
1992-10-09
1995-04-18
Beatty, Robert B.
Photocopying
Contact printing
Light boxes
355274, 355277, 355315, G03G 1514
Patent
active
054083001
ABSTRACT:
An image-transfer and sheet-separating apparatus transfers an image toner-developed from a positive latent image and retained on a photoconductor drum onto a copy sheet, and subsequently separates the sheet from the photoconductor drum. A sheet peel-separating AC voltage and an image-transferring DC bias voltage is applied to a transfer roller which presses on the photoconductor drum. The AC voltage is applied to the transfer roller when a transport-forward end of the sheet is located between the transfer roller and the photoconductor drum, and subsequently the DC voltage is applied to the transfer roller. A post image-transfer charge-stripping element removes charge from the copy sheet and is disposed in a portion of the sheet-transport stream forward of a nipping position at which the transfer roller presses against the photoconductor drum. Thus, charge remaining on the copy sheet is discharged, ensuring high efficiency in image transfer and accordingly reducing the incidence of failure in the separation of the copy sheet from the photoconductor drum.
REFERENCES:
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patent: 4081212 (1978-03-01), Wetzer
patent: 4190348 (1980-02-01), Friday
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Abstract of Japan, vol. 10, No. 330 (P-514) (2386) published Nov. 11, 1986 for Japanese Patent Application No. JP-A-61 137 178, Jun. 24, 1986.
Xerox Disclosure Journal, vol. 1, No. 5, May 1976, p. 83, by Fletcher et al. entitled "High Frequency Pulsed Bias Roller Transfer System."
Xerox Disclosure Journal, vol. 4, No. 2, Apr. 1979, p. 143, by Bruce W. Friday entitled "Lead Edge Transfer Switching."
Fujita Shigeo
Wataki Ryuji
Beatty Robert B.
Mita Industrial Co. Ltd.
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