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Web monitoring system

  • US 4,828,156 A
  • Filed: 10/08/1987
  • Issued: 05/09/1989
  • Est. Priority Date: 10/08/1987
  • Status: Expired due to Term
First Claim
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1. A method of monitoring defects in material or operations performed on a continuously moving web of record media including the steps of:

  • starting movement of record media along a processing line, observing the moving record media, stopping the moving record media upon observing a defect therein,starting the web of record media for moving along the processing line after observing a defect in the web of record media,timing the movement of the web of record media for a first predetermined period of time to allow for preparation of a processing operation,timing the movement of the web of record media for a second predetermined period of time to allow for marking the web of record media at the end of the first predetermined period of time to indicate the end of the defect,marking the web of record media during the second predetermined period of time at one processing operation,sensing the web marking at a subsequent processing operation and indicating that a marking has been sensed on the moving web,stopping the moving web and correcting the defect sensed, andrestarting the moving web after correcting the defect.

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