Image forming apparatus having a developer deterioration detecti

Details Image forming apparatus having a developer deterioration detecti Image forming apparatus having a developer deterioration detecti

1991-11-18

1992-11-10

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355246, 355296, 355326, G03G 1508, G03G 1500

Patent

active

051628490

ABSTRACT:
An image forming apparatus which detects deterioration of developer contained in a developing unit, and if it is the case, the toner is discharged out of the developing unit through a surface of an image carrying member. The apparatus is provided with a sensor to measure toner concentration in developer contained in the developing unit, a drive controller to control a supply amount of toner into the developing unit based on the toner concentration, a calculating unit to obtain average toner supply during a predetermined period, a detecting unit to detect the deterioration of the developer by comparing the average toner supply with a reference data stored in a memory.

REFERENCES:
patent: 4331184 (1982-05-01), Terashima et al.
patent: 4963927 (1990-10-01), Ishihara

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