Method for measuring weft tension in shed

Abstract

The invention discloses a method for measuring weft tension in a shed. The method comprises the following steps of: marking weft of which the total length is between 5 and 1,500 meters at intervals of 5 to 150 meters; uniformly winding the weft on a bobbin; introducing from a weft insertion device into the shed by a weft storage device; throwing into a fell by a reed; aligning a high-speed camera with the shed within the breadth range of a weaving machine, and placing the high-speed camera out of the motion range of the reed; shooting by the high-speed camera to obtain a state image of the weft in the shed when the weft moves in the shed at high speed, and inputting the shot image into a computer; analyzing the state image of the weft in the shed in the computer, and calculating the elongation of the weft in the shed; and thus, obtaining the tension of the weft in the shed according to relationship between the tension and the elongation of the weft obtained by a yarn breaking strength tensile tester. The method can be used for measuring the tension of the weft during weaving of an air jet weaving machine, a water jet weaving machine, a rapier weaving machine, a gripper shuttle loom or a shuttleless weaving machine.

Description

technical field [0001] The invention relates to a method for measuring the tension of weft yarns, in particular to a method for measuring the tension of weft yarns in a shed. Background technique [0002] The fabric is made up of tens of thousands of warp yarns that are extremely long and arranged in sheets and weft yarns one after another, such as figure 1 shown. The warp thread exits from the weaving beam 1, goes around the back beam 2, passes through the skein rod 3, the heald frame 4 and the reed 5, and forms a fabric at the weaving fell. The weft carrier 6 is introduced into the shed. The healds on each heald frame move according to a movement law. Due to the movement of the heald frame, the warp yarn rises and falls and is divided into upper and lower layers to form a shed (opening), and then the weft yarn is introduced into the shed (weft insertion). When the weft yarn passes through the shed After the opening, the reed 5 moves the weft yarn into the opening (beati...

AI Technical Summary

Problems solved by technology

However, because the weft yarn is restricted by the upper and lower layers of warp yarns in the shed, there is no technology that can measure the tension of the weft yarn in the shed. Tension before the shed

For example, the invention patent specification of CN101319951A disclosed on December 10, 2008 discloses a yarn tension detector and a weft yarn tension detection device of a jet loom. On the guide bar between the tandem nozzles, this method cannot measure the tension of the weft yarn in the shed

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