Transfer device for duplex copier using a single charger and tra

Details Transfer device for duplex copier using a single charger and tra Transfer device for duplex copier using a single charger and tra

1991-02-28

1992-08-11

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Copying both sides of original

355275, 355326, G03G 2100

Patent

active

051383632

ABSTRACT:
A polarity inverting charger is provided at the location between developing position of a photoconductor and transfer position to invert the polarity of a toner image formed on the photoconductor after a first image is transferred onto an intermediate transfer belt from the photoconductor. A transfer charger is actuated with opposite polarity to that of the polarity when the first toner image is transferred onto the intermediate transfer belt to transfer the first toner image on the intermediate transfer belt onto a second surface of a transfer sheet simultaneously when a polarity inverted second image on the photoconductor is transferred onto a first surface of the transfer sheet.

REFERENCES:
patent: 3697170 (1972-10-01), Bhagat et al.
patent: 3697171 (1972-10-01), Sullivan
patent: 3847478 (1974-11-01), Young
patent: 4448872 (1984-05-01), Vandervalis
patent: 4659211 (1987-04-01), Oka
patent: 4714939 (1987-12-01), Ahern et al.
patent: 4959669 (1990-09-01), Haneda et al.

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