Developing unit for an image recording apparatus

Details Developing unit for an image recording apparatus Developing unit for an image recording apparatus

1990-06-01

1992-05-19

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355246, 355260, G03G 1506, G03G 2100

Patent

active

051152754

ABSTRACT:
A developing unit usable with and removably mounted on a copier, printer, facsimile machine or similar image recording apparatus. When the developing unit reaches the end of a predetermined service life thereof as counted in terms of, for example, the number of times that a toner end condition has occurred, it is prevented from being loaded again on the body of the image recording apparatus and, at the same time, the user is clearly informed of the time for replacement of the developing unit.

REFERENCES:
patent: 4607939 (1986-08-01), Saito
patent: 4668074 (1987-05-01), Hirozane
patent: 4952976 (1990-08-01), Katoh et al.
patent: 4961088 (1990-10-01), Gilliland et al.
patent: 4974020 (1990-11-01), Takamatsu et al.
patent: 5017962 (1991-05-01), Tsuji et al.

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