Image forming apparatus having plural developing units and an ar

Details Image forming apparatus having plural developing units and an ar Image forming apparatus having plural developing units and an ar

1988-06-07

1990-08-14

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355326, 355245, G03G 1500, G03G 1501

Patent

active

049491245

ABSTRACT:
An image forming apparatus has plural developing units which perform image forming operations with use of either one of the developing units.
The image forming apparatus includes a counting arrangement for counting a respective number of times of use of the plural developing units or with respect to each of the colors of developers contained in the plural developing units. A developing unit is selected having the highest frequency in use among the developing units when the image forming apparatus is brought into the initial mode thereof.

REFERENCES:
patent: 3886329 (1975-05-01), Kamiyama
patent: 3960445 (1976-06-01), Drawe
patent: 4222660 (1980-09-01), Furuichi et al.
patent: 4416533 (1983-11-01), Tokunaga et al.
patent: 4453821 (1984-06-01), Smith
patent: 4496237 (1985-01-01), Schron
patent: 4634258 (1987-01-01), Tanaka et al.
patent: 4720730 (1988-01-01), Ito

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