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AssigneeArteva Technologies S.A.R.L.
InventorJens Harmstorf
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To detect yarn defects such as protruding filaments, broken filaments, ringers, fuzzballs, stripbacks and the like, a yarn sheet 9 traveling in a plane is scanned by light beams from at least two light barriers 10, 11. When a yarn defect interrupts the light beam of a light barrier, a detector pulse is triggered, appropriately amplified and transformed and sent to evaluating means 22. Such a detector pulse is triggered each time a yarn defect passes through a light barrier, so that the travel time or time difference T1,2 between the trip times of a yarn defect through the two light barriers can be determined by the evaluating means. Since the yarn sheet 9 passes through the light barriers at a constant velocity v, the travel times for the various individual ends from one light barrier to the next will differ and therefore can be used to determine the distance S normal to the yarn traveling direction of the yarn defect to the point of intersection of the light beams of the two light barriers. When one of the light beams is oriented perpendicularly to the yarn traveling direction, the equation S=T1,2*v/tan cc applies. The light barriers 10, 11, which each comprise a light source and a detector, are arranged relative to each other in a V-shape and their light beams form the angle α.
A process for continuous detection and localization of yarn defects in a yarn sheet which is traveling in a plane and which is scanned by light beams for yarn defects such as protruding filaments, broken filaments, fuzzballs, stripbacks, ringers and the like, each light beam interruption triggered by such a yarn defect triggering a detector pulse, which comprises the yarn sheet passing through a measuring arrangement which consists of light barriers made up of light sources and detectors being arranged relative to each other in a V-shape and also evaluating means, the light beams of the light barriers extending parallel to the yarn sheet plane, at constant speed and the travel distances of the individual ends from one light barrier to the adjacent light barrier differing in length.
Apparatus for the continuous detection and localization of yarn defects in a yarn sheet traveling in a plane, comprising light barriers for detecting detector pulses triggered by fuzzballs, broken filaments, protruding filaments, stripbacks, ringers and yarn defects of that kind, wherein at least two light barriers (10, 11) whose light beams form an angle α with each other are disposed at right angles to the traveling direction and immediately above or below the yarn sheet (12) and parallel to the yarn sheet plane and each or every light barrier (10, 11) comprises one of the light sources (1, 2) and a detector (3, 4) plus associated evaluating means.
Dependencies are inferred from the claim text.