The drawing mechanism used on warp knitting machines

Update:03-01-2020
Summary:

The warp knitting machine needs to cover the pulling ro […]

The warp knitting machine needs to cover the pulling roller in time when the fleece on the surface layer of the pulling roller is damaged during the large flat car or during use, so as to ensure that the pulling stability is stable and the density is accurate. This is to ensure the accurate weight of the warp knitted fabric. The basic elements of good and stable appearance quality。 With the rapid development of the warp knitting industry, the number of new security personnel continues to increase, and their covering methods are different.Although the flannel can be wrapped around the pulling roller in the end, the covering effect The life span of flannel fabrics varies, ranging from a few days to a long period of six months. Many pulling roller flannel fabrics produced by warp knitting factories start to break before they reach the prescribed time limit. It is properly wrapped on the pulling roller.It can be used for at least 2 years in normal use, and 4 to 5 years in length.Generally, the flannel can be replaced in flat cars, or it can be replaced after a longer period of time, which mainly depends on daily maintenance, and The thickness of the produced fabric. Precision and requirements. According to the practical experience in production, this paper introduces the wrapping method of the fleece on the surface of the pulling roller, which is conducive to the maintenance of the technical points.

First, the pulling roller covers the flannel

1.Main role

The drawing mechanism used on warp knitting machines generally includes 2 rolls, 3 rolls, 4 rolls, and 5 rolls.Among them, the most common 4-roller drawing mechanism is that the drawing roller is used to make the knitted fabric under a certain tension. Continuously and timely pulling out from the knitting area, which is conducive to the loop formation mechanism to continue weaving.It is one of the important links to control the gram quality of the fabric.

The main function of the skin of the pulling roller is to increase the friction between the fabric and the pulling roller, so that the pulling roller clamps the newly knitted fabric, and ensures that the fabric does not slip during the pulling process, and accurately and uniformly according to the process requirements Or gaps, so that weaving can be carried out smoothly and the drawing density can meet the process requirements.

Cuticle classification

The selection of the pulling roller mechanism or the surface of the pulling roller mainly depends on the type of fabric produced 、 the pulling angle of the machine 、 the friction between the fabric and the pulling roller the general range of the density of the cloth surface and the satisfaction of the style of the cloth surface There are many types of skins of the take-up rollers in the iso-roller winding mechanism, but there are two types of skins of the pull rollers of common warp knitting machines. An example is shown in Figure 1.

Non-flannel

a. Hard plastics are attached to the surface of the pulling roller to make it smooth. Generally, it does not need to be replaced. As shown in Figure 1a, it is mainly used for Raschel models (such as RS4-1) and occasionally for Terry. Models (such as Copcentra 、 KS);

b. The texture is relatively hard, and it is similar to silicon carbide or other hard materials on the canvas. As shown in Figure 1b, it needs to be manually wrapped on the pulling roller.

Flannel

a. The pulling roll velvet cloth used by most Trico warp knitting machines has a moderate soft and hard texture, which is similar to the rigidity of a cardboard box, but can be bent and wound to meet the needs of most fabrics, as shown in Figure 1c; b .Soft texture, such as woven rough blanket fabric for pulling roller skin。

3.Requirements for wrapped puller flannel

a. Flat, there should be no overlap or gap between the peripheries (left and right), and the outer circumference of the wrapped puller should be the same;

b. The gap between the pulling roller and the pulling roller should be the same, and should not be too large. Generally, the next threading piece (about 0.4mm) can be entered and exited;

c. The flannel is completely attached to the surface of the pulling roller, and there is no gap between the surface of all points of the flannel and the pulling roller;

d. The flannel at both ends of the pulling roller should be fixed on the pulling roller flatly to prevent the flannel head from detaching from the pulling roller during operation, which will cause the entire flannel to peel off and fail, thereby accelerating the damage of the flannel and bringing longitudinal density Inaccurate or even broken yarn

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