Symmetric warp let-off method and device of single needle bed warp knitting machine

Abstract

The invention relates to a symmetric warp let-off method and device of a single needle bed warp knitting machine. Yarns are conveyed to a weaving portion from a front side and a back side of a machine body of the single needle bed warp knitting machine respectively; and let-off paths of yarns at two sides of the machine body are mutually symmetrical, i.e., a symmetrical axis of the let-off paths is perpendicular to a central cross beam. The warp let-off device includes an even number of warp let-off systems which are horizontally symmetrical and positioned on the two sides of the machine body of the warp knitting machine; each warp let-off system includes a yarn unfolding mechanism, a yarn tension adjustment mechanism, and a looping mechanism; yarns are unfolded by the yarn unfolding mechanism, the tension of the yarns is adjusted by the yarn tension adjustment mechanism, and the yarns are conveyed to the looping mechanism. The influence of yarn tension difference on knitting can be avoided, the knittability of the yarns can be improved; a plurality of rows of yarn division needles and yarn guide needles can disperse extreme fine metal wires, tangled metal wires can be reduced, broken ends can be reduced, and the quality and the production efficiency of fabrics can be improved.

Description

technical field [0001] The invention belongs to the field of textile machinery, and relates to a symmetrical let-off method and device for a single-needle-bed warp knitting machine, in particular to a single-needle-bed warp that transports low-elongation and high-modulus yarns from a pan head to a knitting mechanism. A symmetrical let-off method and device for a weaving machine. Background technique [0002] One or several groups of yarns arranged in parallel are formed into loops at the same time on all the working needles of the warp feeding machine to form a knitted fabric. This method is called warp knitting, and the fabric is called warp knitted fabric. The knitted machine is called a warp knitting machine, which is widely used in the textile field. [0003] Warp knitting machines can be divided into single-needle-bed warp-knitting machines and double-needle-bed warp-knitting machines according to the number of needle beds. The traditional single-needle-bed warp knitti...

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Problems solved by technology

[0003] Warp knitting machines can be divided into single-needle-bed warp-knitting machines and double-needle-bed warp-knitting machines according to the number of needle beds. The traditional single-needle-bed warp knitting machines set all the let-off systems on the front side of the machine. Yarn breaks, especially the gray and indistinguishable very fine wire yarns, are not easy to find. Even if the yarn breaks are found, it is extremely difficult to find the broken yarns from the large number of warp threads, especially When the yarn in the middle bar is broken, it is more difficult to find it. It often needs to be stopped and it takes a long time to find it. Due to the trouble of more yarns beside it, it is also difficult to splice the broken yarn. For the traditional single-needle bed warp knitting machine , when the warp is threaded, many bars can only be threaded separately in turn, which reduces the threading speed and low production efficiency. The angle with the central beam is different, presenting an asymmetrical let-off route, so the warp let-off tension in each bar is different, and the synchronization of each bar’s fluctuation in the loop forming cycle is different, and finally the fabric is especially made of The structural coil length and tension uniformity of fabrics spun from low-elongation high-modulus yarns such as glass fiber, metal wire, and carbon fiber are more serious.

[0004] Patent CN20091002818.4 discloses a warp let-off device, but this warp let-off device is used on a double-needle bed warp knitting machine, and is not suitable for single needle bed warp let-off, the yarn feeding path is long, and the warp let-off angle is too large. Low production efficiency

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