Detection of developer powder amount contained in a developer re

Details Detection of developer powder amount contained in a developer re Detection of developer powder amount contained in a developer re

1977-10-21

1979-11-20

Braun, Fred L.

Photocopying

Including fiber optics

118712, 222DIG1, G03G 1500

Patent

active

041749022

ABSTRACT:
An opening is formed in a bottom wall of a developer reservoir, where a U-shaped diaphragm is secured. The diaphragm is bent downward when developer powder is present in the developer reservoir more than a predetermined amount. When the quantity of developer powder decreases below the predetermined amount during a development operation, the diaphragm returns to its initial configuration, that is, the diaphragm is bent upward. The bent conditon of the U-shaped diaphragm is detected through the use of a suitable detection device such as a microswitch, whereby an alarm lamp is activated when the developer powder decreases to below the predetermined amount.

REFERENCES:
patent: 3520445 (1970-07-01), Hansen
patent: 3572551 (1971-03-01), Gillespie et al.
patent: 3593842 (1971-07-01), Berg
patent: 3639051 (1972-02-01), Charlap et al.
patent: 3951309 (1976-04-01), Kadowaki

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