Toner quantity detecting system for an image recording apparatus

Details Toner quantity detecting system for an image recording apparatus Toner quantity detecting system for an image recording apparatus

1992-03-25

1993-08-17

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355208, G03G 2100

Patent

active

052373720

ABSTRACT:
A toner quantity detecting system has a toner quantity detector (4c) and is capable of accurately detecting the decrease of the quantity of toner contained in the toner container of the developing unit of an image recording apparatus to an upper threshold quantity and to a lower threshold quantity regardless of the inherent output characteristic of the toner quantity detector (4c) and determining a prewarning voltage (E.sub.nep) representing the upper threshold quantity and a warning voltage (E.sub.emp) representing the lower threshold quantity so that the difference between the prewarning voltage (E.sub.nep) and the warning voltage (E.sub.emp) is sufficiently large. The prewarning voltage (E.sub.nep) and the warning voltage (E.sub.emp) are determined on the basis of the inherent output characteristic of the toner quantity detector (4c). The output voltage (E.sub.s) of the toner quantity detector (4c) is compared with the prewarning voltage (E.sub.nep) and the warning voltage (E.sub.emp) to provide a prewarning signal (NAL) upon the reduction of the quantity of the toner to the upper threshold quantity and to provide a warning signal (EAL) upon the reduction of the quantity of the toner to the lower threshold quantity.

REFERENCES:
patent: 4739365 (1988-04-01), Hino
patent: 4932356 (1990-06-01), Watanabe et al.
patent: 5035198 (1991-07-01), Niito
patent: 5036363 (1991-07-01), Iida et al.
patent: 5075726 (1991-12-01), Itaya et al.
patent: 5091749 (1992-02-01), Iida et al.

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