Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1985-06-27
1987-05-26
Moses, R. L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 3DD, 118689, 222DIG1, G03G 1508
Patent
active
046680748
ABSTRACT:
A device for detecting the amount of developer remaining in a developer tank of a developing device is provided. A stirring unit is rotatably provided in the developer tank, and the present detector device is operatively associated with the stirring unit for detecting the level of resistance applied to the stirring unit by the developer inside of the tank. The detector device includes a pair of discs arranged opposite to each other, in which one of the discs is provided freely rotatable i one direction around a center shaft on which the stirring unit is mounted and the other disc is fixedly mounted on the center shaft. A spring is provided to bias one of the pair of discs to rotate with respect to the other and the pair of discs are so structured to cause a relative rotation over a predetermined angle. When the stirring unit experiences a greater level of resistance by the developer, the first and second discs are maintained in a first relative position against the force of the spring; whereas, the first and second discs are set in a second relative position by the force of the spring when the level of resistance encountered by the stirring unit has decreased beyond a predetermined threshold level.
REFERENCES:
patent: 4456364 (1984-06-01), Hatzis
patent: 4592642 (1986-06-01), Imaizumi et al.
Moses R. L.
Ricoh & Company, Ltd.
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