Abnormality detecting system in an image forming apparatus

Details Abnormality detecting system in an image forming apparatus Abnormality detecting system in an image forming apparatus

1990-04-10

1991-09-17

Moses, R. L.

Photocopying

Contact printing

Light boxes

355204, 355208, G03G 0000

Patent

active

050499386

ABSTRACT:
An image forming apparatus for developing an electrostatic latent image formed on the surface of a photosensitive member into a visual image by the use of two-component developer consisting of toner and carrier. The apparatus is provided with a developing unit, which accommodates the developer and in which screw rollers are rotatably mounted for agitating the developer. The apparatus is further provided with an abnormality detecting system for detecting abnormalities which are liable to occur in the developing unit. The abnormality detecting system includes a toner density sensor for detecting the density of toner accommodated in the developing unit. In the normal condition, the toner density detected by the toner density sensor regularly fluctuates as the developer accommodated in the developing unit is agitated by the screw rollers. The abnormality detecting system further includes a control circuit, in which the cycle of fluctuation of the toner density is compared with that of agitation caused by the screw rollers. When both the cycles do not coincide with each other, the control circuit outputs a signal indicating that some abnormality has occurred in the apparatus.

REFERENCES:
patent: 4592645 (1986-06-01), Kanai et al.
patent: 4739365 (1988-04-01), Hino
patent: 4931835 (1990-06-01), Higgins et al.
patent: 4956669 (1990-09-01), Nakamura
patent: 4958188 (1990-09-01), Miyamoto

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