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Presser foot technology for computerized knitting machines

Views: 2     Author: Site Editor     Publish Time: 2022-08-22      Origin: Site

On modern computerized knitting machines, the function of the presser foot is essential because the combination of presser foot technology and electronic control technology dramatically improves the knitting ability of the flat knitting machine, which not only enriches the design and color of the product but also improves the quality of the product.


1. Knitting principle of the presser foot


The presser foot is generally formed by a unique pulling mechanism composed of a thin and long metal sheet or steel wire, which is installed on the corresponding position of each loop-forming system of the triangle seat of the flat knitting machine and moves back and forth with the triangle seat. When working, the presser foot is just between the grid teeth of the two needle beds, under the latches of the rising needles, and above the old stitches.


The cross-sectional shape of the presser foot is different, and its optimal working position is also different. Generally, it should be located at several needles before the bending of the yarn before the starting point, that is, before the bending section. The primary function of the presser foot is to act on the old coils that have just been formed during the loop forming process, preventing these loops from rising with the pointer that is being withdrawn to achieve the purpose of pulling the fabric. The pulling method is centralized pulling...

computerized knitting machines

2. Influence of needle bed mouth section and presser foot shape on the weave of knitted fabrics


The cross-section of the presser foot can have many shapes, the most common shapes are round and rectangular cross-sections:


The cross-sectional shape of the needle bed mouth used in ordinary flat knitting machines is an inverted V shape. The presser foot device installed in this flat knitting machine mainly adopts a circular cross-section. It falls on the subsidence arc of the positive and negative coils and presses the fabric to make it retreat to achieve the purpose of pulling.


For flat knitting machines with parallel cross-sections on both sides of the needle bed section, the presser feet are primarily rectangular, mainly knitting single-sided weave such as straight needles. The tissue pulling is formed by the downward pressing and pulling of the presser foot and the needle bed, so the presser foot is always inclined from front to back and downwards according to the direction of head movement.


If the cross-sectional shape of the needle bed is a flattering V shape, double-sided or single-sided fabrics can be knitted with a presser foot with a circular cross-section. If the distance between the two needle beds is increased, double-sided fabrics can be knitted; if the distance between the two needle beds is reduced, single-sided fabrics can be knitted. When knitting single-sided fabrics, the presser foot squeezes the fabric along the cross-section of the needle bed to make it unwind.


On some computerized knitting machines, a leading and auxiliary presser foot is installed at the same time. The leading presser foot is used to hold the old coil, and the auxiliary presser foot is used to pull or arrange the coil.


3. Basic types of presser feet

There are many presser foot devices, but they can generally be divided into two types according to their functional characteristics, one-way presser foot and two-way presser foot.


The one-way presser foot generally means that the presser foot enters the working state in one direction, so there are two presser feet in the same triangle system. And exit work should generally be outside the yarn guide parking area, outside the knitting area, to prevent it from colliding with the yarn guide when it goes up and down.


Double-system computerized knitting machines generally have 4 presser foot devices. After each course is finished, the control system receives the presser foot control signal, combined with the synchronization signal obtained from the field, calculates the number of steps required to rotate the presser foot to control the stepping motor, and obtains A string of codes is used to drive the stepper motor, so that the presser foot control meets the process requirements.

Bidirectional presser foot generally means that both ends of the same presser foot can work alternately when the machine head moves back and forth. Therefore, the same triangle system only needs one presser foot, and the presser foot enters the working state in two directions. When the machine head moves from right to left, the swing bar swings to the left, and the presser foot enters the work; otherwise, the swing bar swings the presser foot to the right. In this way, the presser foot can automatically change the direction according to the change of the moving direction of the machine head and is always in the working state.


4. The advantages of knitting with a presser foot


On the flat knitting machine using the presser foot device, the pulling of the new coil is mainly carried out by the presser foot. Since the presser foot is a centralized pulling, its operational characteristics are as follows:


It can transfer stitches, take off stitches, and hold stitches. In this way, even if a tissue needle is detached from the old coil and becomes an "empty needle," these separate old coils will not appear "ladder-off" due to the pulling force, and the pointer holding the old coil that has been withdrawn from work can be used again when needed. To work.


It can not only transfer the loop to prevent the needle but also release the needle with an empty needle, and the number of needles can be arbitrarily set at one time. Partial weaving is possible. In a weave, part of it may not be knitted, and part may be knitted, such as multi-column tucks.


Empty a needle to start the mouth; you can knit the mouth course without a threading board.


These functions of the presser foot significantly improve the knitting ability of the flat knitting machine, which is mainly manifested in that, on the one hand, it can knit new patterns that cannot be knitted on ordinary flat knitting machines; on the other hand, it can carry out forming or three-dimensional knitting.


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