Image forming apparatus

Details Image forming apparatus Image forming apparatus

1990-09-17

1993-06-08

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355204, 355208, 118688, 118689, G03G 2100

Patent

active

052184099

ABSTRACT:
An image forming apparatus is loaded with a developing device capable of being easily exchanged, and a toner sensor for detecting a toner density is provided in association with the developing device. An output signal of the toner sensor approaches 0 V as a weight of a developer becomes small. Therefore, when the output signal from the toner sensor is detected prior to an agitating screw is operated when a power source is turned-on, it is possible to determine whether a developing device attached at that time is an unused or used one in accordance with the output signal. In addition, the output of the toner sensor when the developing device is an unused one is stored in a backed-up memory as a reference value for controlling a toner density during an actual operation.

REFERENCES:
patent: 4167322 (1979-09-01), Yano et al.
patent: 4851875 (1989-07-01), Tanimoto
patent: 4912512 (1990-03-01), Midorikawa et al.
patent: 4932356 (1990-06-01), Watanabe et al.
patent: 4956668 (1990-09-01), Arnold et al.
patent: 4963939 (1990-10-01), Kurando et al.
patent: 5012286 (1991-04-01), Kawano et al.

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