Method and apparatus for detecting residual quantity of toner in

Details Method and apparatus for detecting residual quantity of toner in Method and apparatus for detecting residual quantity of toner in

1991-11-13

1993-05-25

Gellner, Michael L.

Photocopying

Contact printing

Light boxes

355206, 355209, 118689, G03G 2100

Patent

active

052144755

ABSTRACT:
An image forming apparatus includes a developing unit and a photoconductive drum. A toner sensor is disposed in a toner mixing chamber of the developing unit. A mixing member is included in the chamber for mixing and frictionally charging the toner. A detection device is mounted on the unit for detecting the residual quantity of density of the toner according to the output voltage of the sensor. The residual quantity or density of the toner is detected by sampling an output voltage of the toner sensor at predetermined times during a predetermined period while the mixing member is rotated at a specific constant speed, and averaging the sampled vales. As a result correct data for the residual quantity or density of the toner can be obtained.

REFERENCES:
patent: 4647185 (1987-03-01), Takeda et al.
patent: 4758861 (1988-07-01), Nakamura et al.
patent: 4901115 (1990-02-01), Nakamura et al.
patent: 4903051 (1990-02-01), Egawa et al.

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