Air curtain former for creating an air curtain to compensate for

Details Air curtain former for creating an air curtain to compensate for Air curtain former for creating an air curtain to compensate for

1998-04-15

2000-05-16

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223B, 2502221, G01N 904

Patent

active

060640561

ABSTRACT:
This invention presents a method of clearing a sensor field of debris, including liquids, through the use of an air curtain. An embodiment of this invention addresses the problem of impurity buildup in the sensing field of an optical sorter. An air curtain is created which prevents film buildup between the light sensor and the light source by blowing material and impurities, which form the film as they fall off articles being sorted, out of the sensing field.

REFERENCES:
patent: 3809913 (1974-05-01), Prellwitz
patent: 5192973 (1993-03-01), Hickisch
patent: 5683000 (1997-11-01), Low

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