Verfahren und Vorrichtung zum Schären von Fäden

摘要

Threads are warped with an axially moveable slide onto a drum having a cone, into a plurality of successive warp bands. The threads are warped for a first band based on a predetermined advancement schedule for the slide. The warping of the first band, after a predetermined initial phase, is performed by: (a) measuring an aspect parameter, signifying the form of the winding of the first band, (b) correcting the predetermined advancement schedule of the slide based on a comparison of the aspect parameter and a targeted parametric value to compose a corrected advancement schedule, and (c) storing a successive plurality of descriptive parameters signifying the evolving form of the winding of the band, when successive revolutions of the drum meet a predetermined drum schedule. The threads are warped for successive ones of the bands by: (a) advancing the slide according to the corrected advancement schedule, at least for times after an initial phase, (b) measuring the descriptive parameter according to the predetermined drum schedule during the warping of the bands, and (c) adjusting tension of thread being delivered, depending upon current deviations of the descriptive parameter from corresponding stored values of the descriptive parameter.