Apparatus for detecting toner shortage in developing unit

Details Apparatus for detecting toner shortage in developing unit Apparatus for detecting toner shortage in developing unit

1991-03-14

1992-11-03

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355246, G03G 1508, G03G 1500

Patent

active

051609665

ABSTRACT:
In a apparatus for detecting toner shortage in a developing unit for use in an image recording system which forms a latent electrostatic image on a carrier by exposure based on an image signal and which develops the latent image to record the image, provided are a toner shortage sensor in a container for checking as to the presence or absence of a toner in the container at the location of the toner shortage sensor, a counter section for counting in a cumulative manner the number of image prints and the number of pixels produced by the image recording system when the toner shortage sensor detects a toner shortage, the counter section for successively subtracting the number of image prints and the number of pixels from the associated cumulative totals when the sensor detects the presence of toner in the container, and a control section for stopping at least the operation of the image recording system when the sumulative counting value of either the number of image prints or the number of pixels has reached a predetermined value.

REFERENCES:
patent: 4585327 (1986-04-01), Suzuki
patent: 4847659 (1989-07-01), Resch, III
patent: 4851875 (1989-07-01), Tanimoto
patent: 4870459 (1989-09-01), Ito et al.
patent: 4951091 (1990-08-01), Nawata
patent: 4963927 (1990-10-01), Ishihara
patent: 5005517 (1991-04-01), Fukui et al.

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