Image forming apparatus

Details Image forming apparatus Image forming apparatus

1988-11-22

1990-06-26

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355316, 271259, G03G 1500

Patent

active

049376225

ABSTRACT:
An image forming apparatus having a plurality of copy paper detector sensors in a delivery passage for copy paper. After a first copy paper detector sensor has been turned ON, if a copy paper detector sensor just downstream of the first copy paper detector sensor is not turned ON within a predetermined period of time, there are checked the ON/OFF status of the first copy paper detector sensor and copy paper detector sensors upstream thereof. If one or more of the copy paper detector sensors are ON, the length of the copy paper is compared with a distance between each of the last-mentioned copy paper detector sensors and a copy paper detector sensor just downstream thereof. Based on the comparison result, the position where the copy paper has jammed, is judged.

REFERENCES:
patent: 4307957 (1981-12-01), Kitagawa et al.

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