Developing device for an image forming apparatus using a dry dev

Details Developing device for an image forming apparatus using a dry dev Developing device for an image forming apparatus using a dry dev

1992-02-19

1994-02-15

Gellner, Michael L.

Photocopying

Contact printing

Light boxes

355208, 355246, G03G 1506

Patent

active

052871517

ABSTRACT:
A developing device incorporated in an electrophotographic image forming apparatus using a dry developer. The device stores the developer in a hopper including an arcuate wall. Pressure sensors are mounted on the inner surface of the arcuate wall to determine the amount of developer existing in the hopper. A motor is controllably driven to change the rotation speed of an agitator or to change the period of intermittent rotation of the agitator in response to the outputs of the sensors. The rotation speed of the agitator may be changed in association with the load acting on the agitator. Further, while the motor is rotated at a constant speed, a gearing intervening between the motor and the agitator may have the gear ratio thereof changed to change the rotation speed of the agitator.

REFERENCES:
patent: 4734737 (1988-03-01), Koichi
patent: 4758861 (1988-07-01), Nakamaru et al.
patent: 4977428 (1990-12-01), Sakakura et al.
patent: 5055881 (1991-10-01), Fukuchi

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