Photocopying – Contact printing – Light boxes
Patent
1995-03-08
1996-03-19
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355298, G03G 1500, G03G 2110
Patent
active
055007163
ABSTRACT:
An image forming apparatus including a cleaning unit wherein a storage is defined in a cleaning housing to store therein toner to be discarded which is collected from the surface of a photoconductive drum after image transfer. The aforesaid storage has a capacity exceeding the maximum volume of toner to be used under normal conditions within the service life of the photoconductive drum. A cumulative number of produced copies is found from a signal from a paper discharge detecting sensor, so that with the number reaching a certain value, it is judged that the life of the photoconductive drum has expired. If a reed switch detects that the storage is full of waste toner before the expiry of the life of the photoconductive drum, it is judge to be abnormal, and a display unit is caused to indicate abnormality. Concurrent execution of the exchange of photoconductive drums and disposal of toner waste is assured, and if this is not accomplished, warning for trouble shooting is provided.
REFERENCES:
patent: 4791454 (1988-12-01), Takahashi et al.
patent: 5008711 (1991-04-01), Sakamoto et al.
Kotera Shinichi
Morishita Hiroki
Taniguchi Susumu
Chen Sophia S.
Mita Industrial Co. Ltd.
Pendegrass Joan H.
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