Patent ID: 7654290
Filing Date: 2010-02-02
Classification: D03D

Abstract:
1. A method for transporting a weft thread through the shed of a weaving machine with a nozzle fed with a flowing transportation medium, comprising: registering contactlessly the portion, changeable along the weft thread, of the natural thread charges arranged irregularly on the weft thread by means of the electrostatic induction effect emanating from them, wherein the weft thread moves past a single detector and produces a changing total charge at least in a part of an electrode array, wherein the single detector contains the electrode array having a periodically, in the thread's axial running direction location-specifically, changing sensitivity to the electrostatic induction effect; registering the total charge of the detector based upon a temporally approximate periodic change; determining the changing total charge on the electrode array as a narrow-band frequency spectrum concentrated around a main component, wherein said main component's frequency is proportional to the axial velocity of the weft thread being moved past; evaluating the periodic change in the total charge for determining the axial velocity of the weft thread; and controlling the nozzle of the weaving machine as a function of the axial velocity of the weft thread.