Repeat defect detector system
First Claim
1. A repeat defect detection system for detecting repetitive flaws on predetermined areas of moving web of material being examined, comprising in combination(a) a source of radiation,(b) scanning means for scanning said source of radiation in a predetermined scan path over the web of material being examined,(c) detector means positioned for receiving radiation applied by said source from the material being examined and generating signals in response to the intensity of radiation applied thereto,(d) flaw discriminator means coupled to said detector means for passing flaw signals of predetermined characteristics in accordance with the requirements of said discriminator means,(e) lane means for dividing the web of material being examined into predetermined lane areas along the length of travel of the web and means for generating lane signals representing said lane areas for flaw signal processing purposes, and(f) settable recirculating processing means coupled to said flaw discriminator means and said lane signals for providing flaw signal matrix coordinator outputs indicative of lane number versus downweb position of each new flaw passed by said discriminator means, said processing means having means for locking out individual lanes with a predetermined high data rate until such predetermined high data rate disappears for a predetermined time interval.
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Accused Products
Abstract
A flaw detection system is provided in which a source of radiation is scanned across a web of moving material being examined for repeat defects. The web is divided into lanes for processing purposes, and flaw information derived from the surface of material being examined is processed to provide a two-coordinate matrix location (lane and down-web), which is stored. This circuitry without the matrix outputs has other applications. Separation distances of a repeat flaw in the same lane are compared with a predetermined list, and if a match occurs, future flaw locations are projected in that lane. A repetition of a predetermined number of flaw repeats in a given lane signals an alarm. A predetermined number of misses in a row will result in the clearing of that lane of the particular flaw that failed to repeat.
43 Citations
7 Claims
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1. A repeat defect detection system for detecting repetitive flaws on predetermined areas of moving web of material being examined, comprising in combination
(a) a source of radiation, (b) scanning means for scanning said source of radiation in a predetermined scan path over the web of material being examined, (c) detector means positioned for receiving radiation applied by said source from the material being examined and generating signals in response to the intensity of radiation applied thereto, (d) flaw discriminator means coupled to said detector means for passing flaw signals of predetermined characteristics in accordance with the requirements of said discriminator means, (e) lane means for dividing the web of material being examined into predetermined lane areas along the length of travel of the web and means for generating lane signals representing said lane areas for flaw signal processing purposes, and (f) settable recirculating processing means coupled to said flaw discriminator means and said lane signals for providing flaw signal matrix coordinator outputs indicative of lane number versus downweb position of each new flaw passed by said discriminator means, said processing means having means for locking out individual lanes with a predetermined high data rate until such predetermined high data rate disappears for a predetermined time interval.
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4. The method of providing flaw information in accordance with the position of flaws occurring in a moving web of material being examined by a flaw detection system in which a source of radiation is scanned on a surface of the moving web of material for locating flaws thereon comprising the steps of
(a) dividing said moving web of material into lanes and generating lane signals in accordance with the position of the scan across said material, (b) sorting the flaw signals in accordance with the lane in which they occur, (c) quantizing the number of flaws in a given lane and disabling a given lane for predetermined high flaw rates in that lane until the high flaw rate subsides for a predetermined interval of travel of said moving web of material, and (d) providing down-web and cross-web position data for all flaws occurring on the material for all non-disabled lanes.
Specification