Toner empty detecting system

Details Toner empty detecting system Toner empty detecting system

1991-02-13

1992-11-10

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118694, 355246, G03G 2100

Patent

active

051628481

ABSTRACT:
A toner empty detecting system for use in an electrophotographic printer. A sensor detects the presence of toner and provides toner-empty or toner-present signals. A first counter is incremented when toner-empty signals are detected at pre-determined time intervals and the first counter is cleared when a toner-present signal is detected. When the first counter reaches a predetermined value (first occurrence), the first counter is cleared and a second counter counts the number of printed pages until the first counter again reaches the same predetermined value (second occurrence). An indicator signals the first and second occurrence. Upon the second occurrence, the values of the first counter, second counter and indicator are compared and a comparison signal is provided. The printing is stopped if the comparison signal indicates that an actual toner-empty condition exists and the toner empty condition is displayed.

REFERENCES:
patent: 4669856 (1987-06-01), Yamada
patent: 4742372 (1988-05-01), Takahashi
patent: 4803513 (1989-02-01), Nishise et al.
patent: 4934314 (1990-06-01), Ideyama
patent: 4952976 (1990-08-01), Katoh et al.
patent: 4987449 (1991-01-01), Katoh

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