Positive yarn feeding system of circular knitting machine and control method thereof

Abstract

The invention discloses a positive yarn feeding system of a circular knitting machine and a control method thereof. The yarn feeding system comprises a yarn feeding device, an upper computer and a coder, wherein the coder is used for measuring a rotating speed of a dial of the circular knitting machine and converting the rotating speed into a synchronous pulse signal to send to the upper computer;the yarn feeding device comprises a fixed ring and a plurality of yarn feeders uniformly arranged on the fixed ring, each yarn feeder comprises a bracket, and a yarn feeding wheel, a servo motor andan MCU controller which are arranged on the bracket; the servo motor is used for driving the yarn feeding wheel to rotate and feed yarns, the MCU controller is respectively in signal connection with the servo motor and the upper computer, and the MCU controller controls the servo motor to operate according to a yarn feeding quantity signal and the synchronous pulse signal sent by the upper computer. Each yarn feeder in the invention can dynamically adjust the yarn feeding amount in real time and can be used for weaving jacquard fabrics.

Description

technical field [0001] The invention mainly relates to the field of the yarn feeding system of the circular weft machine, in particular to the field of the active yarn feeding system of the circular weft machine. Background technique [0002] At present, the yarn feeding devices of circular weft machines on the market are mainly divided into two categories: positive yarn feeding and passive yarn feeding. Active yarn feeding is stable and the cloth surface is clean and clear. Yarn, by controlling the tension of the yarn to adapt to the change of the amount of yarn feeding, is mainly used for weaving jacquard fabrics with dynamic changes in the amount of yarn required, and the effect of the woven fabric surface is worse than that of active yarn feeding. [0003] Existing common positive yarn feeding device sees figure 1 and figure 2 , including a fixed ring 1, a transmission wheel 2, a timing belt 3 and a plurality of yarn feeders 4, and a plurality of yarn feeders 4 are ev...

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Problems solved by technology

[0007] 2. If you want to change the amount of yarn feeding, it can only be realized by manually adjusting the transmission ratio of the transmission wheel 2. The control accuracy is low, the operation is troublesome, and it is impossible to achieve real-time dynamic adjustment of the amount of yarn feeding

[0008] Due to the above disadvantages, the existing common positive yarn feeding device can only be used on common circular weft machines, while the jacquard knitting needles of jacquard circular weft machines have three states: flat needle (float), half needle (tuck), For full needle (knitting), the amount of yarn feeding required in different states is different. The pattern of jacquard is ever-changing, and the amount of yarn feeding required is also dynamically changing. Therefore, the existing ordinary positive yarn feeding device cannot be used for jacquard round Jacquard fabrics are woven on the weft machine. At present, most of the woven jacquard fabrics use passive yarn feeding, and the surface effect of the woven jacquard fabrics is not satisfactory.

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