Developing apparatus, developing method, and developing...

Details Developing apparatus, developing method, and developing... Developing apparatus, developing method, and developing...

2007-09-11

2007-09-11

Goodrow, John L (Department: 1756)

Electrophotography

Diagnostics

Consumable

C399S267000, C430S120400

Reexamination Certificate

active

10940624

ABSTRACT:
A developing apparatus is provided in which a replenishment developer when replenished has been electrified to a sufficient extent and can immediately produce an effect of replenishment, with a small consumption of a carrier. In an developing apparatus100of the present invention, by means of a first and a second agitation and conveyance screw21, 22arranged in an upper space13and a lower space14, respectively, a first two-component developer LT stored in the spaces is agitated and conveyed, so that it is supplied to a developing roller20so as to perform development processing of an electrostatic latent image on a photosensitive member. This developing apparatus replenishes a second two-component developer HT stored in a cartridge30into a first two-component developer LT in the spaces in an appropriate manner in accordance with the progress of the development process, so that a component composition of the first two-component developer can be kept within a prescribed range. In this case, amounts of electrification Q1, Q2of the first and second two-component developers are set to be Q2=Q1×A (A=0.6−1.5) when the second two-component developer is readjusted to the same state of its toner concentration as that of the first two-component developer.

REFERENCES:
patent: 5819132 (1998-10-01), Hirobe
patent: 5870656 (1999-02-01), Hibino et al.
patent: 6096466 (2000-08-01), Imai et al.
patent: 3352569 (2002-09-01), None
patent: 3379318 (2002-12-01), None

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