Color transfer copying process and apparatus using charge removi

Details Color transfer copying process and apparatus using charge removi Color transfer copying process and apparatus using charge removi

1977-06-16

1978-10-17

Welsh, John D.

Photocopying

Including fiber optics

96 12, 96 14, G03G 1501

Patent

active

041205774

ABSTRACT:
A color transfer copying process for forming a colored image corresponding to an original by repeating prescribed times the procedures of projecting a reflected ray image from the original to be copied on a photosensitive material uniformly charged by a charging electrode through a filter to form an electrostatic latent image on the photosensitive material, converting the latent image to a toner image by using a powdery developer containing a coloring toner and transferring electrostatically the toner image onto a transfer sheet, while using selectively blue, green and red filters. Said process is characterized in that an electrode is disposed in the vicinity of a transfer passage for the transfer paper so that it acts on the transfer paper after completion of the transfer operation and said electrode is energized in regular sequence with the same frequency as that of the transfer operations or as that of the transfer operations exclusive of the final transfer operation to neutralize or diminish the retention charge of the coloring toner transferred onto the transfer paper at the transfer operation. It is made possible at the subsequent transfer operation to transfer and superpose a predetermined quantity of the coloring toner of the coloring toner image on the photosensitive material onto the transfer paper even in areas overlapped with the coloring toner image formed at the preceding transfer operation. A direct current having a polarity reverse to that of the transfer electrode for transferring the toner image to the transfer paper is applied to said charge-removing electrode.

REFERENCES:
patent: 2986466 (1961-05-01), Kapielian
patent: 3640707 (1972-02-01), Caldwell

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