Image forming apparatus using fresh toner and used toner

Details Image forming apparatus using fresh toner and used toner Image forming apparatus using fresh toner and used toner

1995-01-19

1997-01-07

Braun, Fred L.

Electrophotography

Control of electrophotography process

Control of developing

399359, G03G 1508, G03G 2100

Patent

active

055922678

ABSTRACT:
In an image forming apparatus, a latent image is electrostatically formed on a photoconductive element and then developed by a developing unit. The developing unit is formed with a used toner inlet for receiving used toner. A cleaning unit removes toner remaining on the photoconductive element after image transfer and thereby collects it as the used toner. A conveying device conveys the used toner from the cleaning unit to the used toner inlet of the developing unit. A toner end sensor is disposed in the developing unit and adjoins the used toner inlet. On determining that the amount of toner existing in the developing unit is less than a predetermined amount, the sensor causes fresh toner to be replenished into the unit.

REFERENCES:
patent: 4357097 (1982-11-01), Koiso
patent: 4894688 (1990-01-01), Taniguchi et al.
patent: 5260754 (1993-11-01), Yano et al.
patent: 5268720 (1993-12-01), Saitoh et al.
patent: 5307128 (1994-04-01), Murasaki et al.
patent: 5386274 (1995-01-01), Sanpe et al.
patent: 5526100 (1996-06-01), Misago et al.

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