Photocopying – Contact printing – Light boxes
Patent
1992-04-16
1993-10-12
Gellner, Michael L.
Photocopying
Contact printing
Light boxes
355206, 355208, 355246, G03G 1506
Patent
active
052530205
ABSTRACT:
An image forming apparatus according to the present invention is provided with a developing unit which develops an electrostatic latent image formed on an electrostatic latent image holding body. The image forming apparatus comprises a measuring device for measuring toner concentration in the developing unit, a toner container for storing toner, a first supply unit for supplying a predetermined amount of toner from the toner container to the developing unit when it is determined that the toner concentration measured by the measuring device is lower than a first predetermined concentration, a second supply unit for supplying from the toner container to the developing unit toner of a larger amount than the first supply unit, a storage device for storing predetermined information related to concentration when it is determined that the toner concentration measured by said measuring device is below a second predetermined concentration lower than the first predetermined one, and an actuating device for actuating the second supply unit if the predetermined information has been stored in said storage device when power is turned on.
REFERENCES:
patent: 4462680 (1984-07-01), Ikeda
patent: 4648702 (1987-03-01), Goto
patent: 4734737 (1988-03-01), Koichi
patent: 4803521 (1989-02-01), Honda
patent: 4901115 (1990-02-01), Nakamura et al.
patent: 4951091 (1990-08-01), Nawata
patent: 4956669 (1990-09-01), Nakamura
patent: 5043764 (1991-08-01), Arnold et al.
Kashiwagi Shoji
Kitagawa Tsuneo
Matsushita Tetsuo
Gellner Michael L.
Minolta Camera Kabushiki Kaisha
Stanzione P.
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