Image forming apparatus having a plurality of feed openings

Details Image forming apparatus having a plurality of feed openings Image forming apparatus having a plurality of feed openings

1988-04-22

1989-11-14

Prescott, A. C.

Photocopying

Contact printing

Light boxes

355316, 355317, 355321, 271 9, 271256, G03G 1500

Patent

active

048811041

ABSTRACT:
When paper jam occurs during copy operation, the paper feed opening (which is one of the paper feed openings 1a to 1d) in which the paper jam occurs is determined, and thus, the number of occurrences of paper jam is counted for each of the paper feed openings. When the number of occurred times of paper jam exceeds a predetermined number, the paper feed opening concerned is forbidden to be used until maintenance or other repair work is completed. If the preferred feed opening (1a) assigned the first priority is forbidden to be used, another preferential feed opening is selected based on the numbers of occurred times of paper jam in the other paper feed openings (1b to 1d). On the other hand, when paper jam occurs, a paper jam occurrence ratio is calculated for each paper feed opening based on the number of sheets and the number of occurred times of paper jam counted. Based on the result of the calculation, control operation for selecting the paper feed openings (1a to 1d) including the preferential one is performed.

REFERENCES:
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patent: 4506974 (1985-03-01), Sugiura et al.
patent: 4545668 (1985-10-01), Zaitsu
patent: 4575227 (1986-03-01), Ito et al.
patent: 4580890 (1986-04-01), Sugizaki et al.
patent: 4624546 (1986-11-01), Fukushi et al.
patent: 4663722 (1987-05-01), Sato
patent: 4693459 (1987-09-01), Shimoda et al.
patent: 4724460 (1988-02-01), Shinyashiki

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