RU2495168C2 - Method of forming fabric with variable density of filling thread - Google Patents

Abstract

FIELD: textiles, paper.

SUBSTANCE: method of forming fabrics with variable density of filling thread arrangement, that lies in the fact that before filling thread beating fabric is moved to a distance greater than technology requires and then supplied toward the comb. At that in transition of density of fabric on weft the value of fabric supply towards the comb and the value of prior removal of fabric change. At the beginning of forming of a new portion with new density of filling thread during one cycle of fabric forming edge of fabric moves in the direction of mastitis (during transition to the thinned portion) or towards the remise (during transition to compacted portion) to a Δ=λb-λth where Δ is the displacement of fabric, λb is value of beating area in forming of the compacted area of fabric, λth is value of beating area in forming of thinned area of fabric. Thus, a clear transition of densities in the strips of fabric with variable density is possible. When moving to a thinned area after fabric moving to the above given value, the value of the fabric supply to comb is reduced to 0.

EFFECT: reduction of abrasive loads on the warp threads in the formation of low-density area of fabric with variable density of filling thread, the possibility making of tissue with variable density of filling thread of a higher quality due to the possibility of obtaining fabric with clearly defined transition of density of filling thread.

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Description

The invention relates to the textile industry and can be used on weaving machines for the production of fabrics of various assortments, including fabrics with a programmable variable density in the weft.

From US Pat. No. 5,024,253, a system for controlling the movement of tissue during production of tissue with a variable density in the weft is known. As a disadvantage, a transient process is noted, which can last several weft stitches, even if the removal of tissue immediately corresponds to the target density in the weft. The disadvantage is proposed to be eliminated by moving the tissue corresponding to a higher target density in the weft (when moving to a vacuum) or moving the tissue corresponding to a lower target density (when moving to a densified area). However, even in this case, the transient process cannot be completely avoided, as when moving to the densified area, the edge of the fabric will not occupy the desired position for the formation of the target density within one revolution of the main shaft. Only the transition time is reduced. To ensure a clear transition, it is necessary to ensure that the product regulator can operate in reverse mode.

Of these methods of tissue formation, we can distinguish an invention known from the USSR AS No. 1595960. The method consists in the fact that each cycle of tissue formation consists of the removal of tissue from the formation zone, supply of tissue to the formation zone, vallana (tissue) mat after the tissue returns to the formation zone.

In this case, the tissue density in the weft is determined by the difference between the values of tissue removal and the amount of tissue return to the formation zone.

The prototype is a method of forming fabrics with variable weft density, known from RF Patent No. 2309205, which is an improved method of the USSR AS No. 1595960, and makes it possible to produce fabrics with variable programmable density in weft. At the same time, the essence of the method of forming fabrics with a variable density over the weft is that the fabric before surfing the weft is removed by an amount greater than what is required technologically, and then fed to the formation zone, and at the moment of density transfer, the amount of tissue supply to the formation zone changes as much as possible the amount of preliminary removal of tissue from the formation zone, which leads to a change in tissue density in the weft.

The disadvantage of this method of forming fabric with a variable density in the weft is also the presence of a transition process and increased abrasion of the warp threads during the production of a tissue section sparse in the weft (which can lead to an increase in the breakage of the warp threads). This is due to the fact that only the amount of tissue supply towards the reed can be adjusted when the density passes through the weft.

An object of the invention is to reduce abrasive loads on warp yarns during the formation of a sparse portion of tissue with a variable density in a weft, as well as the possibility of obtaining fabrics with a variable density in a weft of higher quality due to the possibility of obtaining fabrics with clear boundaries of the transition of density in the weft.

The technical result is achieved by using the method of forming a fabric with a variable density of the arrangement of threads on the weft, which consists in the fact that the fabric before surfing the weft is allocated an amount greater than what is required technologically, and then fed towards the reed. In this case, when the density of the tissue passes through the weft, the amount of tissue supply towards the reed and the value of preliminary tissue removal change. The edge of the fabric at the beginning of the formation of the site with a new density in the weft during one cycle of tissue formation is shifted towards the abdomen (when moving to a sparse area) or towards the remise (when moving to a compacted area) by Δ = λпу-λпр, where Δ - the amount of tissue displacement, λпу - the size of the surf strip during the development of the densified tissue section, λpr - the size of the surf strip during the development of the rarefied tissue section. Thus, a clear transition of densities in strips of tissue with variable density is possible. When moving to a sparse area after moving the fabric to the above value, the amount of tissue supply to the reed decreases to 0. Thus, when the sparse section is formed, there is no supply of tissue to the reed, and the amount of tissue removal corresponds to the target density of the weft of the sparse fabric section.

The process of tissue formation with a certain (constant) density in the weft is accompanied by the presence of a certain (constant) value of the surf plane, which is established by itself in the process of weaving. During the transition from one density in the weft to another during the development of tissue with variable density during the formation of each density section, the size of the surf strip should be constant. The length of the fabric located beyond the line of action of the reed (at the moment of the extreme forward position) from the side of the remise at the moment of beginning of the interaction of the reed and the edge of the fabric will determine the size of the surf strip during the formation of the fabric. When the density is changed by the weft, the indicated length of the fabric will change by an amount equal to the difference between the values of the removal of tissue in the area of the density change. In the formation of the next tissue element, the density of the weft will no longer determine the amount of tissue removal by the commodity regulator, but the above-mentioned fabric length. This fact leads to the fact that the density transition process is stretched by several revolutions of the main shaft until the size of the surf strip stabilizes at a level corresponding to the fabric density being formed. Therefore, it is proposed to move the fabric by Δ so that the edge of the fabric takes a position corresponding to the target density and the size of the surf strip is stabilized within one revolution of the main shaft.

The movement of the fabric during the development of the fabric according to the proposed method is shown in figa - for the case of the transition from a less dense strip to a denser, figb - for the case of a transition from a denser strip to a less dense

Information sources

1. Seliverstov V.Yu. Commodity regulator of a loom [text] / V.Yu. Seliverstov, A.P. Grechukhin, V.A. Tyagunov. // RF patent №2309205, D03D 49/60; claimed January 23, 2006; published October 27, 2007, FIPS.

2. Steinbach V.P. Commodity regulator of a loom [text] / V.P. Shteinbakh, Yu.M. Utkin // USSR Copyright Certificate No. 1595960, D03D 49/20; claimed 03.10.88; published September 30, 1990, FIPS.

3. Susumu Kawabata (Toyota) System for controlling warp take-up and let-off rate / Kawabata Susumu, Yoshida Kazunori, Kisanuki Yoshikatsu et all // Patent US No. 5024253, D03D 49/10; 06/18/1991.

Claims (1)

The method of forming fabric with a variable density in the weft, namely, that the fabric is removed from the formation zone before surfing the weft is an amount greater than what is required technologically to obtain a given density, then the fabric is fed into the formation zone, when changing the density in the weft, the tissue feed amount is changed on the reed, characterized in that the edge of the tissue when changing the density of the weft during one cycle of tissue formation is shifted to the side of the breast (when moving to a sparse area) or to the side of the remise (when moving to the seal ln area) by the value Δ = λпу-λпр, where Δ - the amount of tissue displacement, λпу - the size of the surf strip when developing a densified tissue section, λpr - the size of the surf strip when developing a rarefied tissue section, and when switching to the rarefied section after moving the fabric to the above amount of fabric is allocated for each cycle of the machine according to the required density without feeding it to the bird.