Apparatus for discriminating sheets

Details Apparatus for discriminating sheets Apparatus for discriminating sheets

1980-11-14

1982-10-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

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

356435, G01N 2186

Patent

active

043529887

ABSTRACT:
A sheet discriminating apparatus comprises, in addition to a first detecting system for detecting light transmitted through a sheet and a second detecting system for detecting light reflected by the front surface of the sheet, a third detecting system for detecting light reflected by the rear surface of the sheet. The light doses sensed by these detecting systems are integrated by respective integrators for a predetermined period of time, and the outputs obtained from the integrators are coupled to an adder and added together therein. The sum output of the adder and a reference signal generator are compared with each other in a comparator, and the determination as to whether the sheet in question is adequate for re-use or not is effected on the basis of the result of the comparison.

REFERENCES:
patent: 3448279 (1969-06-01), Lindemann et al.
patent: 3922557 (1975-11-01), Carnes
patent: 4284356 (1981-08-01), Heilman

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