Sheet detecting device for use in an image forming device for de

Details Sheet detecting device for use in an image forming device for de Sheet detecting device for use in an image forming device for de

1990-05-15

1992-01-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, G01N 2186, G01N 904

Patent

active

050846272

ABSTRACT:
A sheet detecting device has a pair of first and second reflection type photosensors in both sides of upper and lower guide members of a sheet carrying path. A reflector member is disposed in the lower guide member facing to the first reflection type photosensor and a comparator for comparing the output signal of the first reflection type photosensor with a predetermined reference value which is used when an image receiving sheet is not fed in the sheet detecting device. The difference between the reflectances of the right side and wrong side of the sheet fed in the sheet detecting device is detected by the first and second reflection type photosensors, so that information of the image receiving sheet is obtained.

REFERENCES:
patent: 3932755 (1976-01-01), Sagawa
patent: 4284356 (1981-08-01), Heilman
patent: 4691100 (1987-09-01), Kizu et al.
patent: 4723072 (1988-02-01), Naruse
patent: 4983854 (1991-01-01), Mizuno et al.

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