Multi-color image forming apparatus

Details Multi-color image forming apparatus Multi-color image forming apparatus

1987-07-14

1988-09-20

Moses, R. L.

Photocopying

Including fiber optics

355 3DD, 355 3TR, G03G 1501

Patent

active

047729163

ABSTRACT:
A multi-color image forming apparatus includes a developing device for developing at a developing station the latent image formed on an image bearing member, the developing device including plural developing units containing different color developers, respectively, which units are selectively movable to the developing station, image transfer device for transferring an image developed by the developing device onto a transfer material, provided with transfer material carrying drum for carrying the transfer material along an endless path in a predetermined direction and for contacting it to the image bearing member for the transfer material to receive the developed image, and a mechanism for moving a selected one of the developing units to the developing station during a period in which L3.gtoreq.L2.gtoreq.L1 is satisfied, where L1 is a length of the transfer material carried on the transfer drum which is measured from the transfer station to a trailing edge of the transfer material in a direction opposite to the predetermined direction, L2 is a length of the image bearing member which is measured from the developing station to the transfer station, and L3 is a length of the transfer material carried on the transfer material carrying member which is measured from the transfer station to a leading edge thereof in the opposite direction.

REFERENCES:
patent: 4593991 (1986-06-01), Aoki et al.
patent: 4615612 (1986-10-01), Ohno et al.
patent: 4620783 (1986-11-01), Tanaka et al.
patent: 4646679 (1987-03-01), Ohno et al.
patent: 4697915 (1987-10-01), Hayashi et al.
patent: 4707108 (1987-11-01), Ohno
patent: 4723145 (1988-02-01), Takada et al.

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