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Fault detection apparatus for material webs

  • US 4,511,803 A
  • Filed: 12/20/1983
  • Issued: 04/16/1985
  • Est. Priority Date: 02/19/1980
  • Status: Expired due to Fees
First Claim
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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.

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