Developing apparatus for determining decreased concentration of

Photocopying – Contact printing – Light boxes

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355246, G03G 1508

Patent

active

051228343

ABSTRACT:
A developing apparatus comprising: a developing device for contacting an electrostatic image-bearing member with a development mix of toner and carrier particles; a first transporting member for transporting the mix to the developing device, a second transporting member for transporting the mix to the first transporting member; a third transporting member for transporting the mix to the second transporting member such that first and second circulations of the mix are, respectively, formed between the first and second transporting members and between the second and third transporting members; a sensor for producing a concentration signal having a value indicative of the ratio of toner in the mix of the first circulation, which is disposed in the first circulation of the mix; and a toner replenishing device for replenishing toner to the second circulation of the mix in response to the concentration signal such that the toner is replenished from an area except for the area corresponding to the second transporting member in the second circulation of the mix.

REFERENCES:
patent: 4708458 (1987-11-01), Ueda et al.
patent: 4864349 (1989-09-01), Ito

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