Photocopying – Contact printing – Light boxes
Patent
1991-08-23
1993-07-13
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355246, 355296, G03G 1508
Patent
active
052278476
ABSTRACT:
Image forming equipment having a developing device for developing a latent image electrostatically formed on an image carrier by a developer, and a cleaning device for removing the developer remaining on the image carrier and collecting it in a collecting section. The equipment determines whether or not the developer collected in the collecting section has reached a predetermined amount by determining whether or not a developer has been supplemented to the developing device a predetermined number of times. The number of times that a developer is supplemented to the developing device is counted on the basis of the output of a supplement detector which determines whether or not a developer has been supplemented. The supplement detector determines that developer has been supplied only when a predetermined number of copies have been made after a toner low/empty signal is indicated or the toner concentration is detected to increase after the toner low/empty signal is indicated.
REFERENCES:
patent: 4669856 (1987-06-01), Yamada
patent: 4742372 (1988-05-01), Takahashi
patent: 4934314 (1990-06-01), Ideyama
patent: 4951091 (1990-08-01), Nawata
patent: 4952976 (1990-08-01), Katoh et al.
patent: 4999676 (1991-03-01), Mouri
patent: 5035198 (1991-07-01), Niito
patent: 5105218 (1992-04-01), Ikeda et al.
Katoh Shunji
Motohashi Hiroomi
Beatty Robert
Grimley A. T.
Ricoh & Company, Ltd.
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