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AssigneeAgfa-Gevaert
InventorsHans Joachim Klein, Manfred Rupprecht, Heinz Wonneberg, Julius Geiger
Estimating the term…
In a process for detecting longitudinally orientated faults on moving webs of paper or film, the web is optically scanned line by line transversely to its direction of movement and read by reflection. The scanning line is moved to and fro across the whole web at constant velocity and during a given number of scanning movements the instantaneous value of the reflected signal is interrogated at two fixed time marks within the scanning line and stored and the average values over a scanning cycle are formed separately for each of the two time marks. The average values ae indicated and recorded as faults only if a value different from the average noise value is obtained from both time marks in succession.
A process for detecting and localising longitudinally orientated faults on moving webs, in which the web is scanned optically line by line trasversely to its direction of movement and read by reflection, wherein:
An optical reflection arrangement for detecting and localising longitudinally oriented faults on moving webs, comprising a source of light, a mirror wheel and, focusing device (together constituting a scanner) and a photo-electric detector in an automatic collimation arrangement, and an electronic processing circuit for processing signals delivered by the detector, wherein the scanner and detector are mounted on a carriage which is displaceable transversely to the direction of movement of the web so that the scanning line of the scanner traverses the moving web, and the electronic processing device comprises a circuit which carries out a quasi-continuous formation of the average value of the signals delivered by the detector.
Dependencies are inferred from the claim text.