Printing method in which both sides of the recording sheet are i

Details Printing method in which both sides of the recording sheet are i Printing method in which both sides of the recording sheet are i

1989-04-13

1991-04-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

356429, G01N 2186

Patent

active

050049283

ABSTRACT:
According to a method and apparatus for detecting a kind of a recording sheet, a light source for emitting a beam on the recording sheet and a photosensitive element for detecting an amount of beam are used. The photosensitive elements located at predetermined positions are caused to detect amounts of beams reflected by upper and lower surfaces of the recording sheet. The kind of upper or lower surface of the recording sheet is discriminated on the basis of a difference between the amounts of beams reflected by the upper and lower surfaces or one of the amounts of beams.

REFERENCES:
patent: 4284356 (1981-08-01), Heilman
patent: 4352988 (1982-10-01), Ishida
patent: 4723072 (1988-02-01), Naruse
patent: 4760271 (1988-07-01), Brenholdt
patent: 4779988 (1988-10-01), Horiguichi

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