Apparatus for detecting toner in image forming apparatus

Details Apparatus for detecting toner in image forming apparatus Apparatus for detecting toner in image forming apparatus

1992-09-17

1994-05-31

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118691, 355246, G03G 1508

Patent

active

053173694

ABSTRACT:
An apparatus for detecting an amount of toner in a toner casing. A sensor detects the magnetic flux density of the toner in the toner casing and generates detection signals. A sampling device samples the detection signals. A selecting device selects a signal having the lowest value among the sampled signals. A device for setting up a threshold value determines the threshold value using the selected signal. A counting device counts the number of sampled signals lower than the threshold value. If the counted number is larger than a predetermined value, then an indicator lamp indicates that toner is lacking.

REFERENCES:
patent: 4758861 (1988-07-01), Nakamaru et al.
patent: 5075726 (1991-12-01), Itaya et al.
patent: 5160968 (1992-11-01), Yamada et al.
patent: 5162874 (1992-11-01), Butler
patent: 5166729 (1992-11-01), Rathbun et al.

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