Image forming apparatus equipped with a plurality of developing

Details Image forming apparatus equipped with a plurality of developing Image forming apparatus equipped with a plurality of developing

1987-09-28

1989-01-31

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 4, 355 3DD, G03G 1501, G03G 1509

Patent

active

048019720

ABSTRACT:
An electrophotographic image forming apparatus capable of bringing one developing unit among a plurality of developing units thereof into an operative state.
To accomplish the developing unit changeover operation in the least necessary time, control means accepts an image forming operation start signal during the developing unit changeover operation to start the image forming operation immediately after the completion of the developing unit changeover operation and accepts a selection signal selecting an another developing unit during the developing unit changeover operation. Furthermore, when the developing unit changeover operation for bringing a developing unit into an operative state is interrupted and then the same developing unit is assigned again to operation, the developing unit changeover operation subsequent to the interruption of the developing unit changeover operation process is carried out in a time corresponding to the residual time in a time allocated for the interrupted developing unit changeover operation.

REFERENCES:
patent: 4652113 (1987-03-01), Watanabe
patent: 4710016 (1987-12-01), Waatanabe
patent: 4713673 (1987-12-01), Kessoku

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