Photocopying – Contact printing – Light boxes
Patent
1989-01-25
1992-03-10
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118656, 355246, 355250, 355253, G03G 1509, G03G 1508
Patent
active
050953397
ABSTRACT:
A developing apparatus operates to develop an electrostatic latent image by using developer which is a mixture of carrier particles and toner particles. Upon detecting a fall in the toner concentration in the developer, a toner supply device supplies stored toner particles to the developer. The supplied toner particles are mixed, by stirring, with the developer by a stirring device. The toner supply device includes a supply roller covered by a short texture or a porous elastic material having a predetermined high resistivity in contact with a circulation current of developer, and a bias power source which applies a bias voltage between the supply roller and the circulation current of developer such that the supply roller and the supplied toner particles have the same voltage polarity.
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Grimley A. T.
Hitachi , Ltd.
Smith Matthew S.
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