Apparatus and method for detecting existence of developing unit

Details Apparatus and method for detecting existence of developing unit Apparatus and method for detecting existence of developing unit

1997-07-31

1998-07-21

Pendegrass, Joan H.

Electrophotography

Diagnostics

Component present or mounted

399 27, G03G 1500, G03G 1508

Patent

active

057846650

ABSTRACT:
An apparatus detects a developing unit and a residual amount of toner. The apparatus includes a magnet mounted under the bottom of a developing unit with a specific distance between them. The apparatus generates a sensing signal upon detecting an up anddown movement of the magnet. Then, in response to the sensing signal, the apparatus generates status messages concerning the existence of the developing unit and a residual amount of the toner. From the status messages, the user may easily check the existence of the developing unit and the residual amount of the toner.

REFERENCES:
patent: 4974025 (1990-11-01), Kikuchi
patent: 4998141 (1991-03-01), Altmann
patent: 5270784 (1993-12-01), Nakane et al.
patent: 5317369 (1994-05-01), Nakanishi
patent: 5521684 (1996-05-01), Takahashi
patent: 5532790 (1996-07-01), Akazawa
patent: 5621221 (1997-04-01), Shinohara et al.

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