Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1994-10-26
1996-06-11
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
2505594, 27126504, 356381, G01N 2186
Patent
active
055258093
ABSTRACT:
An apparatus and method electro-optically senses the presence of a sheet of material by positioning a member and a light emitter relative to the sheet so that the presence of the sheet causes movement of the member and light emitter. The light emitter can include an optical fiber which produces a light spot so that movement of the light emitted can be sensed by an electro-optic sensor based on the position of the light spot on a photosensitive zone within the electro-optic sensor. A sheet-feeding mechanism can be properly positioned to insure proper placement of the sheet.
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Griswold Gary L.
Kirn Walter N.
Le Que T.
Minnesota Mining and Manufacturing Company
Weimer William K.
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