Photocopying – Contact printing – Light boxes
Patent
1988-09-28
1990-01-30
Grimley, Arthur T.
Photocopying
Contact printing
Light boxes
355246, 355326, G03G 1501, G03G 1508
Patent
active
048976903
ABSTRACT:
An image forming apparatus includes first and second devices selectively operable for developing an electrostatic latent image on a photosensitive member, toner accommodating devices for accommodating developer, detecting devices for detecting toner density in each of developers, a judging device for judging whether the first and second developers have same color, a selecting device responsive to the detecting device and judging device for automatically selecting the second developing device in the case where the toner density in the first developer is less than a specified value and where the toner density in the second developer is not less than the specified value under the judgment by the judging device that the first and second developers have same color, replenishing devices for replenishing toner to each of the first and second developers, and means for activating the replenishing device so as to continuously replenish toner to the first developer until the toner density therein reaches the specified value in the case where both of the toner density in the first and second developers are less than the specified value even if the first and second developers have same color, while prohibiting an image forming operation.
REFERENCES:
patent: 4579443 (1986-04-01), Abuyama et al.
Grimley Arthur T.
Minolta Camera Kabushiki Kaisha
Pendegrass J.
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