Method of toner detection for replenishment in a developer

Details Method of toner detection for replenishment in a developer Method of toner detection for replenishment in a developer

1990-06-12

1991-07-30

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355208, 118689, 118694, G03G 2100

Patent

active

050363638

ABSTRACT:
A method of detecting toner in the toner supplying unit of a developing unit wherein a toner supplying roller is caused to make a single turn, the duration of a signal indicating "no-existence of toner" issued during this single turn period is accumulated by timer function of a control unit. When a total sum of accumulated signal timer duration is longer than a first preset time, including a constant margin added to the difference between the time required for a single turn of the toner supplying roller and the time required for passing over the toner detecting surface by a cleaning means, the "no-existence of toner" condition is detected for the toner supplying unit. Additionally, the duration of a signal indicating "existence of toner" is accumulated by the timer function of the control unit, and when a total sum of accumulated signal duration longer than a second preset time is required for making a single turn by the toner supplying roller, the "existence of toner" condition is detected for the toner supplying unit.

REFERENCES:
patent: 4739365 (1988-04-01), Hino

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