Sheet path sensor provided in an electrophotographic image formi

Details Sheet path sensor provided in an electrophotographic image formi Sheet path sensor provided in an electrophotographic image formi

1990-05-30

1991-11-26

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355206, G03G 2100

Patent

active

050686933

ABSTRACT:
A mechanical sheet path sensor used in an electrophotographic image forming apparatus for transcribing image onto a cut sheet by using a toner image formed on a rotating photosensitive drum, for sensing a cut sheet passing therethrough and is placed between a peel-off unit for peeling off the cut sheet after image transcription is performed by an image transcribing unit and a fixing unit for fixing the toner image transcribed on the cut sheet so that a distance from the peel-off unit to the sheet path sensor is shorter than a distance measured along the circumference of the drum from the image transcribing unit to a cleaning unit for cleaning the toner left on the drum after the image transcription. The sensor touches only a side zone where the toner image is forbidden to be transcribed, for avoiding the toner image, not fixed, on the cut sheet from damaging.

REFERENCES:
patent: 3693969 (1972-09-01), Sakamaki et al.
patent: 4244648 (1981-01-01), Schultes et al.
patent: 4937622 (1990-06-01), Makiura

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