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Device for detecting defects in single faced corrugated fiberboards

  • US 4,737,846 A
  • Filed: 05/28/1987
  • Issued: 04/12/1988
  • Est. Priority Date: 05/29/1986
  • Status: Expired due to Fees
First Claim
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1. A device for detecting defects in a web of single faced corrugated fiberboard while it is running, said device comprising:

  • a light source disposed near the track of said web for irradiating a light to the corrugated surface of said web to produce a striped image;

    an image pick-up means for scanning the striped image at a predetermined period by interlaced scanning in a direction perpendicular to the stripes on the striped image to convert the striped image to picture signals and giving the picture signals in a time series manner in synchronization with said period;

    a comparator means for converting said picture signals to binary-coded signals, the number of which corresponds to the number of stripes;

    a counter for counting the binary-coded signals; and

    a computer for comparing the count from said counter with a preset number to detect defects in the single faced corrugated fiberboard.

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