Toner feeding device capable of signalling need to replenish ton

Details Toner feeding device capable of signalling need to replenish ton Toner feeding device capable of signalling need to replenish ton

1992-05-19

1993-10-26

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355260, G03G 1508, G03G 2100

Patent

active

052570762

ABSTRACT:
A toner conveyor disposed in a housing includes an upstream-side toner conveyor and a downstream-side toner conveyor. A toner amount detector is disposed to detect whether the amount of toner in the downstream portion of the housing is greater than a predetermined amount or not, and the upstream-side toner conveyor is not operated when the amount of toner is greater than the predetermined amount in the downstream portion of the housing. A toner replenishment signal is produced when the amount of toner is not greater than the predetermined amount in the downstream portion of the housing despite the downstream-side toner conveying means being operated for more than a predetermined period of time. The toner amount detector can be a plate which rests on top of the toner and pivots up and down as the toner level changes, with a magnet on the plate detected by a suitable detector. Alternatively, the toner amount detector can be a member which moves up and down on top of the toner as the toner level changes, and a photodetector which is activated when the member is at a low level.

REFERENCES:
patent: 4338019 (1982-07-01), Terashima et al.
patent: 4803513 (1989-02-01), Nishise et al.
patent: 4868599 (1989-09-01), Niki
patent: 4952976 (1990-08-01), Katoh et al.
patent: 5008708 (1991-04-01), Enoguchi et al.
patent: 5031001 (1991-07-01), Kusumoto
patent: 5124751 (1992-06-01), Fukui et al.

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