Photocopying – Contact printing – Light boxes
Patent
1988-03-02
1989-08-29
Prescott, A. C.
Photocopying
Contact printing
Light boxes
355 3SH, G03G 1500, G03G 1514
Patent
active
048622141
ABSTRACT:
In an arrangement of a photoconductive drum and a transfer drum which are installed in a color image forming apparatus, the rotation speed of the transfer drum is increased during the interval between consecutive image transfers so as to increase the recording speed. The photoconductive and transfer drums are each rotatable about a shaft driven independently of the other. A photoconductive drum and a dielectric sheet are wrapped around the photoconductive drum and the transfer drum, respectively. The transfer drum is constituted by a hollow cylindrical frame which is made up of two rotatable rings and a connecting portion which interconnects the two rings. The rings and connecting portion cooperate to define an intermediate opening, and the dielectric sheet is positioned to close the intermediate opening. The axial width of the photoconductive drum is smaller than that of the intermediate opening. In opposite end portions of the photoconductive drum where the photoconductive material is absent, positioning disks are provided each making direct rolling contact with a portion of a respective one of the rotatable rings where the dielectric sheet is absent.
REFERENCES:
patent: 4338017 (1982-07-01), Nishikawa
patent: 4370051 (1983-01-01), Matsuyama et al.
patent: 4411511 (1983-10-01), Ariyama et al.
patent: 4537493 (1985-08-01), Russel
patent: 4550999 (1985-11-01), Anderson
patent: 4739361 (1988-04-01), Roy et al.
patent: 4740813 (1988-04-01), Roy
Kasahara Nobuo
Nakahara Tosio
Prescott A. C.
Ricoh & Company, Ltd.
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