Fault detection apparatus for material webs
First Claim
1. Fault detection apparatus for material webs comprising:
- a light scanning device for directing a bead of light along an imaginary line on the surface of a web to effect line scanning thereof, said web having a width; and
an elongate light receiving device disposed to receive light leaving said line within a reception plane containing said line and said light receiving device;
said light receiving device comprising;
a linear array of individual light receivers, means for selectively switching said light receivers on or off in dependence on the position of said light bead along said line and for switching off at least one of said light receivers at each particular instant, said light receivers generating signals in response to incident light, and means connecting said receivers to a processing circuit for processing said signals.
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Accused Products
Abstract
Fault detection apparatus for material webs comprising a light transmitting device for generating a line of light on the material web and an elongate light receiving device which extends parallel to the line of light and is so arranged that it can receive light which enters a predetermined reception plane from the line of light, with the predetermined reception plane lying at a specified angle to the plane normal to the material web and containing the line of light, and with the line of light being formed by a bead of light which scans the web point by point, line by line. The light receiving device (43) comprises a plurality of light receivers (1 to 30) which can be selectively switched in, with at least one of the light receivers being switched out at each particular instant.
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Citations
5 Claims
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1. Fault detection apparatus for material webs comprising:
- a light scanning device for directing a bead of light along an imaginary line on the surface of a web to effect line scanning thereof, said web having a width; and
an elongate light receiving device disposed to receive light leaving said line within a reception plane containing said line and said light receiving device;
said light receiving device comprising;
a linear array of individual light receivers, means for selectively switching said light receivers on or off in dependence on the position of said light bead along said line and for switching off at least one of said light receivers at each particular instant, said light receivers generating signals in response to incident light, and means connecting said receivers to a processing circuit for processing said signals. - View Dependent Claims (2, 3, 4, 5)
- a light scanning device for directing a bead of light along an imaginary line on the surface of a web to effect line scanning thereof, said web having a width; and
Specification
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- Resources
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Current AssigneeErwin SICK GmbH Optik-Elektronik
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Original AssigneeErwin SICK GmbH Optik-Elektronik
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InventorsOstertag, Klaus, Ross, Dieter
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Primary Examiner(s)Nelms, David C.
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Application NumberUS06/563,601Time in Patent Office483 DaysField of Search250/562, 250/563, 250/572, 250/578, 356/430, 356/431, 356/446, 356/447, 356/448US Class Current250/559.48CPC Class CodesG01N 21/8901 Optical details; Scanning d...
