Knowledge

In textile machinery, roller yarn traction devices using friction characteristics are widely used in yarn traction, stretching, transmission and tension control. Commonly used roller devices can be divided into two categories: extrusion type and non-extrusion type.... The squeezing device pulls the yarn along the rollers to output at a synchronous linear speed through mutual squeezing between the rollers; the non-extrusion device pulls the yarn along the rollers at a synchronous speed without applying pressure, and only relies on the friction force of the roller surface against the yarn. Synchronous line speed output. Figure 1 shows the yarn transmission and tension control system of the carpet tufting machine [2]. The yarn feeding roller actively drives the yarn. The speed of the yarn feeding roller determines the amount of yarn fed and the initial tension. In the production of jacquard carpets, the speed of the yarn feeding roller varies according to different pile heights, so that each yarn or a group of yarns can have different yarn feeding speeds; the traction roller drives the yarns with different speeds to be fed into the needle eye At the same time, it is more important to stabilize the yarn tension and reduce the tension fluctuation of each yarn, which will directly determine the actual feeding amount of the yarn, thereby affecting the quality of the carpet jacquard; the moving yarn guide is relative to the fixed yarn guide The change of position can also play a role in adjusting the tension of the yarn. Among them, the research on the design of the traction roller and its technical principles is the key to improving the quality of carpet tufting jacquard. The current literature mostly focuses on the design of yarn traction and tension device l3j, while the research on the yarn traction mechanism of carpet tufting machinery is rare. There are documents.

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