Electrostatographic multicolour printing apparatus for single pa

Details Electrostatographic multicolour printing apparatus for single pa Electrostatographic multicolour printing apparatus for single pa

1996-04-29

1998-04-14

Royer, William J.

Electrophotography

Image formation

Transfer

399309, G03G 1501

Patent

active

057405107

ABSTRACT:
An electrostatographic printing apparatus is provided, suited for single-pass sequential multi-color duplex printing, characterized in that the printing proceeds by depositing and fixing toner particles on a final substrate (1) in web form. The apparatus includes two printing systems arranged in succession on opposite sides of the final substrate (1). Each of the printing systems includes an intermediate rotatable toner-receiving member (3), a device for rotationally driving the intermediate toner-receiving member (3), a device for superimposing color separation images in registration on the intermediate toner-receiving member (3), and a device for simultaneously transferring the superposed color separation images from the intermediate toner-receiving member (3) onto the final substrate (1). In a preferred embodiment, the transferring device is a drum or roller (4), optionally electrically biased, that forms with the intermediate toner-receiving member (3) a nip through which the final substrate (1) is passed in synchronism with the peripheral movement of the intermediate toner-receiving member (3). Preferably, the color separation images are applied in registration to the intermediate toner-receiving member by a plurality of rotatable image-producing electrostatographic drums.

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