Round Weft Knitting Machine
Jun 15, 2018

Circular weft machines can be classified according to the type of needles, the number of syringes, the configuration of the needle cylinders and the motion of the needles.

The circular weft machine mainly consists of a yarn feeding mechanism, a weaving mechanism, a pulling-winding mechanism and a transmission mechanism. The function of the yarn feeding mechanism is to unwind the yarn from the bobbin and feed it to the knitting area, which is divided into three types: negative type, positive type and storage type. The negative type yarn feeds the yarn from the bobbin by tension and feeds it into the weaving area. This yarn feeding mechanism has a simple structure but poor yarn feed uniformity. Positive yarn feeding is the use of a constant linear speed to actively convey the yarn to the weaving area. The advantage is that the yarn is uniform and the tension fluctuation is small, which helps to improve the quality of the knitted fabric.

The yarn for storage type yarn is reeled from the bobbin to the storage bobbin by the rotation of the storage bobbin, and the yarn is pulled out from the storage bobbin by tension and enters the weaving area. Because the yarn is stored on the storage bobbin after a short relaxation and then unwound from a fixed-diameter storage bobbin, yarn tension due to different bobbin volume and unwinding point can be eliminated. difference.

The role of the weaving mechanism is to weave the yarn into a cylindrical fabric by the work of the knitting machine. The knitting mechanism unit that can independently feed the yarn-forming stitches is called a loop forming system and is commonly called a "road". Circular weft machines are generally equipped with more looping systems. The knitting mechanism includes a knitting needle, a yarn guide, a sinker, a presser plate, a syringe, and a triangle.

The needle is placed on the barrel. The syringe has two kinds of rotary type and fixed type. In the latch circular knitting machine, when the rotary cylinder brings the latch needle in the slot of the cylinder to the fixed triangle, the triangular push pin moves the latch needle and knits the yarn into a coil. This method is conducive to increasing the speed and is widely used. When the syringe is fixed, the latch needle is pushed into a loop by the triangle that rotates around the needle cylinder. This method is convenient for changing the triangle position during operation, but the speed is slow. In the crochet circular knitting machine, the crochet needle rotates with the needle cylinder, and the yarn is driven by the sinker to make relative movement between the yarn and the crochet needle to make a circle.

Pull editing

The function of the take-up and take-up mechanism is to take a pair of rotating pulling rolls, hold the cloths, draw the newly formed coils from the looped area, and wind the coils into a certain type of package. According to the rotation of the pulling roller, the pulling mechanism is divided into batch type and continuous type.

Intermittent and active traction and negative traction. The pulling roller rotates at a certain angle every certain time, and the amount of rotation that is not related to the fabric tension is called active pulling, and the amount of rotation is negatively pulled by the fabric tension controller. In a continuous pulling mechanism, the pulling roller rotates at a constant speed, so it is also actively pulled.

In a circular weft machine, a needle selection mechanism is sometimes installed to weave a flower pattern. The pre-designed pattern information is stored in a certain device, and then the knitting needle is put into operation according to a certain program through the transmission mechanism.

The theoretical output of circular weft machines mainly depends on factors such as the speed, machine number, cylinder diameter, number of coiling systems, fabric structure parameters, and yarn fineness. They can be expressed in terms of production factors: output factor = cylinder speed (rpm) Minutes) Syringe diameter (cm/2.54) × number of ring systems. The circular weft machine has great adaptability to the processed yarn, and the wide variety of colors that can be woven can be knitted out of a single piece of formed clothes. The machine has a simple structure, is easy to operate, has a high output, and has a small floor space. It occupies a large proportion in knitting machines and is widely used in inner and outer clothing production. However, due to the inability to increase or decrease the number of needles in the cylinder to change the width of the grey fabric, the tubular gray fabric consumes more.

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