Introduction to the structure of circular knitting machine

Update:23 Jul 2021
Summary:

A yarn shed: The yarn shed is a metal frame used to car […]

A yarn shed: The yarn shed is a metal frame used to carry yarn counts and draw yarns to the loom for weaving. There are two types of forms. The first category is the top yarn shed. It sits on the top of the loom. The form saves space, but its disadvantage is that it is difficult to feed the yarn. In addition, the high-speed machine has a large number of modules. If it increases, the load on the ceiling will cause problems. The second category sits on the ground yarn shed, which occupies a lot of land, but the advantage is that it is convenient for the yarn to be spread, and there is enough space for the yarn to be spread.
Note: The tail end of each yarn usually has a few inches of yarn exposed from the paper tube, which is deliberately made when turning the yarn. Therefore, before weaving a yarn, it can be tail-attached to the yarn end of another new yarn, which can reduce the number of downtime caused by yarn supply.
B top switch: the top switch is located on the top of the loom's yarn shed. After each yarn is drawn from the yarn, it passes through a top switch. When the yarn tension is too high, the yarn will pull the top switch and immediately close the weaving machine; When the yarn leaks (flying into the plane) or the tension is too light, the top switch can also be used as a stopper to avoid roaring or yarn breakage caused by excessive yarn tension.
C conveying: It is divided into active conveying and passive conveying.
1 Active conveying is the use of conveyor belts to control the speed of yarn feeding into the loom, (controlling the weight of the cloth), on the other hand, the yarn speeds that can reach each modulus are under control to improve the quality of the product.
2 Passive conveying means that the knitting needles freely extract the yarn from the yarn into the machine. For some fabrics that cannot be used with a fixed yarn feeding speed, such as yarn-dyed jacquard fabric, it is just more common.
D Midway switch: Before the yarn enters the yarn feeder, it must pass through the midway switch. When the yarn tension is too small or the ends are broken, it will immediately send a signal to stop the knitting machine.
E yarn nozzle (steel shuttle, yarn guide): the yarn enters the hook of the knitting needle after passing through the ground yarn nozzle. It fixes the angle and position of the yarn into the machine, and it occupies one point for whether the knitting needle can hook the yarn An important position, in addition to the earthen gun machine made in Hong Kong, the yarn nozzle can prevent the needle tongue from jumping and close the needle hook, so that the knitting needle can not catch the yarn.
F needle cylinder: needle cylinder or needle plate is divided into upper needle plate and lower needle cylinder. The origin of the name of the single-sided machine is because there is only the lower plate and no upper plate. The bottom plate is a circular metal cylinder, while the upper plate is a round metal billet. The diameter of the two is the same, and the diameter is what we call the loom inch, such as 26G30", etc. No matter the top or bottom The needle discs are engraved with many pits, each pit can hide a knitting needle, and the stitches are exposed out of the needle cylinder. The needles of the bottom plate are arranged perpendicular to the ground, while the needles of the upper plate are parallel to the ground.