Image forming apparatus having toner-empty detecting and indicat

Details Image forming apparatus having toner-empty detecting and indicat Image forming apparatus having toner-empty detecting and indicat

1989-10-25

1992-03-10

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355206, 355246, G03G 2100

Patent

active

050953311

ABSTRACT:
The density of a toner in a developing device is detected by a magnetic sensor if the density is lower than a reference value, a toner-empty state is indicated on a control panel. When a copy key is operated in this toner-empty state, the number of copies in the toner-empty state is counted by means of a counter. If the count value is not larger than a preset value, the copying operation is allowed. If the count value exceeds the predetermined value, the copying operation is prohibited.

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patent: 4627715 (1986-12-01), Kikuno
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patent: 4786942 (1988-11-01), Kusumoto et al.
patent: 4951091 (1990-08-01), Nawata
patent: 4977429 (1990-12-01), Tani et al.
patent: 4987449 (1991-01-01), Katoh

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