Coating apparatus – Control means responsive to a randomly occurring sensed... – Responsive to condition of coating material
Patent
1980-11-03
1983-01-25
Lawrence, Evan K.
Coating apparatus
Control means responsive to a randomly occurring sensed...
Responsive to condition of coating material
118688, G03G 1509, G03G 2100
Patent
active
043697330
ABSTRACT:
A toner concentration control apparatus of the type for allowing developer to pass through a chute, which is capable of detecting stopping of the flow of the developer in the chute, clogging of the chute with the developer, or coating of a viewing window formed in the chute with the developer, and upon occurrence of such abnormalities, minimizing the trouble therefrom in the operation of the copying machine, in which light from a single light source is simultaneously detected by two photosensors, the light striking one of the photosensors directly and the other after being reflected from the developer comprising toner and carrier particles as the developer passes a viewing window in the chute provided for the detection of the toner concentration within the copying machine, and the output of the photosensors is compared with each other and the concentration of toner in the developer can be determined and adjusted by the comparison value. In addition, the output of the photosensor which receives the light reflected from the developer contains an A.C. component signal which indicates the flow of the developer along the inside of the viewing window, and a D.C. component signal which corresponds to the concentration of toner in the developer, and, by detecting the presence or absence of the A.C. component signal, abnormalities in the flow of developer are detected.
REFERENCES:
patent: 3756192 (1973-09-01), Locklar et al.
patent: 4292925 (1981-10-01), Terashima
Hirakura Koji
Kitamura Takahiko
Sawada Yasuo
Watase Kenta
Lawrence Evan K.
Ricoh & Company, Ltd.
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