Control of toner concentration in a developer

Details Control of toner concentration in a developer Control of toner concentration in a developer

1985-06-12

1988-03-29

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118689, 118690, 222DIG1, 355 3DD, G03G 1508

Patent

active

047347376

ABSTRACT:
A toner concentration control method and system for controlling the toner concentration of a developer which includes toner and carrier for use in electrophotography. A controller, typically including a central processing unit or CPU, first determines a degree of deviation of the current toner concentration from a predetermined reference level and then replenishes the toner to the developer at an optimal replenishing condition which is varyingly set in accordance with the detected degree of deviation. In the preferred embodiment, the flow rate of toner to be supplied and time period of replenishing operation are varyingly set. Besides, the frequency of toner concentration detecting operation is also varyingly set so as to alleviate the load of the CPU.

REFERENCES:
patent: 4032227 (1977-06-01), Hubbard et al.
patent: 4226525 (1980-10-01), Sakamoto et al.
patent: 4364659 (1982-12-01), Noda
patent: 4462680 (1984-07-01), Ikeda

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