CN109487410B

CN109487410B - Weaving method for weaving multi-warp multi-weft series fabric by using air jet loom

Info

Publication number: CN109487410B
Application number: CN201811466792.6A
Authority: CN
Inventors: 张建民; 张志刚; 赵婷; 董少伟
Original assignee: Shaanxi Changling Textile Electromechanical Technology Co Ltd
Current assignee: Shaanxi Changling Textile Electromechanical Technology Co Ltd
Priority date: 2018-12-03
Filing date: 2018-12-03
Publication date: 2020-05-05
Anticipated expiration: 2038-12-03
Also published as: CN109487410A

Abstract

The invention discloses a weaving method for weaving multi-warp and multi-weft series fabrics by using an air jet loom, which comprises warp direction doubling and weft direction doubling; the warp direction doubling adopts a drafting sequence method to weave; the weft doubling is realized by editing a design and color card introduced with a virtual design and color, the introduced virtual design and color is an empty weft signal, weft insertion and weft detection are not carried out after the empty weft signal is output, and weft density data of the empty weft signal is set to be 0; and when the fabric stops coiling in the doubling process, the doubled wefts are close together, and the effect that a plurality of wefts are introduced into one weaving opening at the same time is realized. The invention can realize the doubling weaving of any number of weft yarns in one weaving opening on common weaving machines such as crank opening, passive opening, active opening and the like; compared with the original weaving method of the fabric, the weaving scheme has the advantages of high cloth cover quality, low equipment investment, high yield, low auxiliary cost and the like.

Description

Weaving method for weaving multi-warp multi-weft series fabric by using air jet loom

Technical Field

The invention belongs to the technical field of textile production equipment, and relates to a weaving method for weaving multi-warp multi-weft series fabrics by using an air jet loom.

Background

The multi-warp and multi-weft fabric is a fabric with a three-dimensional grid effect, wherein the warp direction and the weft direction are woven by two or more yarns which are doubled and separated by a certain distance. The representative fabric has a double-lattice formed by doubling two yarns and a triple-lattice formed by doubling three yarns. The fabric is a very popular variety in the market of the current textile clothes, has unique style, strong three-dimensional sense, elegant appearance, comfort and durability, has good wear-resistant and tear-resistant effects, is mainly used for clothes and decorative cloth, and is commonly used for police, military training clothes and the like.

The weave diagram (as shown in figure 1) of a typical three-dimensional lattice fabric has a small jacquard characteristic, the warp direction adopts a special harness wire threading method to realize doubling, and the weft direction is difficult. At present, the weft direction mainly comprises the following two weaving schemes:

1. weaving by using a multi-arm open air-jet loom or a rapier loom. Dobby shedding looms, which can drive up to 16 heald frames and set the lifting sequence arbitrarily according to the requirements of the weave pattern, can achieve the weaving of such fabrics, but have obvious disadvantages. Firstly, the electronic multi-arm shedding equipment has large investment, and the electronic multi-arm shedding device of a common domestic air jet loom is more than 20 ten thousand. Second, the operating speeds are low, and the speeds of domestic air jet looms with electronic dobby openings do not exceed 650rpm, and are generally below 600 rpm. The speed of the rapier loom with mechanical multi-arm opening is below 200rpm, and the number of heald frames for multi-arm opening is large, which results in high stop rate of the loom. Therefore, the equipment for weaving the fabric by the multi-arm opening loom has large investment, low yield and low operation efficiency.

2. The weft yarns are put into a shed one time in advance and are doubled. According to the scheme, a weft yarn doubling process needs to be added in the preparation process, doubling equipment and operators are needed, and weft yarns doubled in advance can be twisted together due to the twist, so that the cloth cover style can be changed. The weft yarns of the fabric are usually thick yarns such as 21s, 16s and 10s, and the weft insertion of an air jet loom is extremely difficult after multi-strand doubling, so that the practical speed is low, the air jet pressure is high, and the weft insertion requirements of multi-strand yarns and single yarns cannot be met. The scheme of the double-lattice type of the fine count yarn can also be woven, and the scheme has little feasibility in three lattices and even more than four lattices. Therefore, the scheme has poor cloth cover style, high cost, narrow adaptive surface and low yield.

In conclusion, most of the fabrics are woven by adopting a small rapier loom with a mechanical multi-arm opening, the speed is low, the yield is low, and the cloth surface quality is general. The air jet loom for weaving the fabric is rare at present, an electronic multi-arm opening needs to be configured, the equipment investment is large, and the yield is still low due to low speed.

Disclosure of Invention

The invention aims to provide a weaving method for weaving a multi-warp and multi-weft series fabric by using an air jet loom, which can realize doubling of any number of weft yarns under the conditions of high speed and low energy consumption without the need of pre-plying and doubling.

The technical scheme adopted by the invention is as follows:

a weaving method for weaving a multi-warp multi-weft series fabric by using an air jet loom comprises warp direction doubling and weft direction doubling operations;

the warp direction doubling adopts a drafting sequence method to weave;

the weft doubling is realized by editing a design and color card introduced with a virtual design and color, the introduced virtual design and color is an empty weft signal, weft insertion and weft detection are not carried out after the empty weft signal is output, and weft density data of the empty weft signal is set to be 0; and when the fabric stops coiling in the doubling process, the doubled wefts are close together, and the effect that a plurality of wefts are introduced into one weaving opening at the same time is realized.

And when weft doubling, the weft insertion unit, the winding unit and the weft detecting unit are matched according to the edited design and color pattern board:

the edited design and color stripe board comprises a physical design and an added virtual design and color, the physical design and color is set to be capable of weft insertion and weft density data of the physical design and color, the virtual design and color is set to be not weft insertion and weft density data of the virtual design and color is set to be 0, and meanwhile the virtual design and color is set not to carry out weft detection;

when the loom is in operation, the pattern card is sent to the weft insertion unit, the color selection signal is output to the coiling control unit by the weft insertion unit in real time according to the pattern card and the weft density number corresponding to the pattern, and the coiling control unit calls the weft density according to the current pattern and controls the speed of a coiling motor in real time according to the weft density data and the vehicle speed variable to realize variable weft density weaving;

and when the weft insertion control unit acquires the virtual design and color signal, the weft insertion is not carried out when the weft density data is 0, the coiling control stops coiling, and the weft detecting detection of the virtual design and color is closed.

The drafting sequence of the warp direction doubling is as follows:

during drafting, drafting is carried out according to a fabric basic structure in a forward drafting method, and when warp-wise doubling is met, doubling weave points are threaded on the same page of heald frames or distributed on several pages of heald frames with the same motion law.

Compared with the prior art, the invention has the following beneficial technical effects:

the weaving method for weaving the multi-warp and multi-weft series fabric by using the air jet loom provided by the invention comprises the steps of editing the pattern card, executing output control by the weft insertion unit, and completing the matching of the weft insertion unit, the coiling unit and the weft detecting unit according to the pattern card; the card data comprises a path of 'empty weft' signal which is normally output but is not actually subjected to weft insertion and is not subjected to weft detection, and the 'empty weft' weft density data is set to be 0, namely, the fabric stops coiling to enable the doubled wefts to be close together, and if a plurality of wefts are simultaneously introduced into a weaving opening; the doubling of any number of weft yarns can be realized under the conditions of high vehicle speed and low energy consumption, the doubling and doubling are not needed in advance, and the doubling and weaving of any number of weft yarns such as 2 or 3 in a weaving opening can be realized even on the simplest common weaving machines such as crank opening, passive opening, active opening and air jet weaving machine.

According to the invention, because the yarn does not need to be plied and doubled in advance and the electronic multi-arm opening is not needed, even on the simplest crank opening air jet loom, any weft yarn doubling can be realized through the special weft insertion algorithm, the high speed can be realized, the cloth cover style is good, and the equipment investment is low; the user is satisfied with this solution by the actual weaving practice.

The invention can smoothly implement arbitrary interval double-parallel and triple-parallel of 21S and 16S weft yarns on the simplest crank shedding loom with four pages of heald frames, has the advantages of 750rpm of vehicle speed, over 90 percent of efficiency, high yield, excellent cloth cover quality and low energy consumption, and can meet the requirements of common double-vertical-lattice and three-vertical-lattice fabric weaving. The weaving of various types of multi-warp and multi-weft fabrics by the scheme is also easy to realize for the weaving machine provided with the active cam openings and the passive cam openings. The equipment investment is only half of that of an electronic multi-arm open air jet loom, the yield is high, the energy consumption is low, the variety adaptation range is wide, the cloth cover style is good, and the weaving scheme is a better weaving scheme of the variety; the air jet loom with lower configuration can be used for comprehensively replacing an expensive and low-speed electronic dobby loom to weave the variety.

Drawings

FIG. 1 is a schematic representation of the weave of a typical three-dimensional fabric variety.

FIG. 2 is a block diagram of a let-off take-up system;

FIG. 3 is a control schematic diagram of weft insertion and weft detection;

FIG. 4 is a schematic drawing of weft doubling;

FIG. 5 is a schematic view of a fabric draw;

FIG. 6 is a schematic drawing of weft doubling at weft 3;

FIG. 7 is a schematic diagram of weft direction doubling weaving process and finished product of weft direction 3.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The weaving method for weaving the multi-warp and multi-weft series fabric by using the air jet loom comprises warp direction doubling and weft direction doubling;

warp direction doubling is realized by adopting a drafting sequence;

during weft doubling, the output control is executed by the weft insertion unit by editing the design and color card with the virtual design and color introduced, and the weft insertion unit, the winding unit and the weft detection unit are matched according to the data of the design and color card;

the card data comprises a path of 'empty weft' signal which is normally output but is not actually subjected to weft insertion and is not subjected to weft detection, and the 'empty weft' weft density data is set to be 0, namely, the fabric stops coiling to enable the doubled wefts to be close together, and a plurality of wefts are simultaneously introduced into a weaving opening; and the weft insertion control unit calculates which color weft insertion and weft density are currently performed according to the pattern card data, and the weft detecting unit controls whether to perform weft detecting detection.

Further, the specific operation is as follows:

1) warp direction doubling is realized by adopting a drafting sequence, and particularly, common multi-warp and multi-weft series varieties in the current market can be realized by adopting four-leaf heald frames;

according to the fabric weave structure, warp direction doubling weave points penetrate the warps with the same sinking and floating rules on the same heald frame or a plurality of heald frames with the same sinking and floating rules by adopting a fly-through method according to the movement rule of the heald frames. Specifically, during drafting, the fabric is firstly drafted according to the basic structure of the fabric in a forward drafting method, and when meeting warp-wise doubling, the doubling structure points are drafted on the same page of heald frames or distributed on several pages of heald frames with the same motion law.

For example, the basic weave is a plain weave, four pages of heald frames (numbered 1, 2, 3 and 4 heald frames respectively) are generally adopted during weaving, three warp yarns are arranged every n warp yarns and form a longitudinal stripe (three-vertical-grid weave), the n warp yarns are sequentially and circularly threaded on the four pages of heald frames by threading one warp yarn on each page of heald frame in a straight-through method according to the sequence of the

number

1, 2, 3 and 4 heald frames, and the last warp yarn is threaded on the number i heald frame; the three warp yarns of the doubling are completely threaded on a heald frame i +1 or are distributed and threaded by a threading method of i +1, i +1 and i +3, then a next group of n warp yarns are sequentially threaded by taking the heald frame I as a starting point, and the process is repeated until the complete warp yarns are threaded;

if every n warp yarns have two warp yarns and form a longitudinal stripe (a two-vertical grid structure) together, the two warp yarns of the doubling are threaded by a threading method of i +1 and i +1, and the rest threading methods are the same as the three-vertical grid threading method.

2) The design and color stripe board based on virtual design and color also needs to be subjected to the following coordination control:

2.1) realizing real-time variable weft density weaving of each weft of an electronic winding device of a weaving machine by setting weft density data

Referring to fig. 2, the winding device of the air jet loom is mainly composed of a winding servo motor, a servo motor driver, a winding turbine reduction gearbox, a winding friction roller, a control unit (ETU) and the like. The control unit controls the servo motor to operate through the servo motor driver, and the servo motor drives the rolling friction roller to rotate after being decelerated by the rolling turbine reduction gearbox so as to drag the cloth away from the weaving opening. When the cloth is pulled away from the cloth fell, the cloth is tightly wound around the friction roller without relative sliding, so the linear speed of the friction roller determines the number of weft yarns in the unit length of the cloth, namely the weft density. The control unit can control the servo motor to operate according to the required rotating speed according to the rotating speed, the speed reduction ratio, the diameter of the friction roller and the specified weft density of the weaving machine so as to meet the required weaving weft density.

Therefore, several weft density data, such as four and numbered 1#, 2#, 3#, 4# weft density data, can be preset. When the loom runs, a color selection signal is output to the winding control unit in real time by the weft insertion unit according to the weft density corresponding to the pattern and the pattern, and the winding control unit calls several weft densities according to the current pattern and controls the speed of the winding motor in real time according to the weft density data, the speed and other variables, so that variable weft density weaving is realized.

2.2) controlling weft-detecting switch of loom to realize independent switch control of each weft

Referring to fig. 3, the weft detecting switch of the loom is controlled by a weft detecting plate (FU), and the independent control of weft detecting is added on the basis of the control: that is, the weft detecting function of each color can be independently opened and closed (for the weft detecting control unit of the existing equipment, no hardware change is needed, and only control improvement is needed).

Specifically, when the weft insertion unit selects colors according to the requirements of the design and color pattern boards for weft insertion, whether the current design and color weft insertion is successful or not is detected and fed back by the weft detecting board, and the weft detecting function of any design and color can be closed through control setting of the weft detecting function, so that the weft is not stopped even if the weft is not detected.

2.3) realizing multicolor free weft selection based on physical two-color weft insertion channel

The current air jet loom is generally provided with at least physical two-color weft insertion channels (color 1 and color 2), and one of the colors is selected once in the two color ranges for weft insertion. The invention improves the calling of the color plate, and adds a certain number of virtual colors besides the two paths of physical colors can be selected, namely, the colors are simulated by software for selection.

If can simulate as four optional colors: color 1, color 2, color 3 and color 4, wherein color 1 and color 2 are true colors and colors which exist really and can be actually inserted, and color 3 and color 4 are virtual colors and do not exist really and can not be actually inserted.

The card data is weft color-selecting pattern data during weaving, namely a color-selecting sequence diagram, and is edited by an upper computer (WINCE system) according to a certain format and sent to a weft insertion unit for execution. If the card data specifies the operation of the loom, weft insertion is performed in the order of color 1, color 2, color 1, and color 2 … ….

2.4) the shedding device can be a common passive cam shedding, an active cam shedding or even the simplest crank shedding to realize weft doubling.

Taking the exemplary trilobal weave shown in FIG. 1 as an example, the fabric is woven on a plain weave basis with 3 warp yarns being doubled every 21 warp yarns and 3 weft yarns being doubled every 11 weft yarns.

Further, specific warp and weft doubling operations are given below in the context of the fabric weave of FIG. 1.

1. Warp direction doubling: four pages of heald frames are adopted according to the structure of the fabric weave, and are numbered as 1#, 2#, 3#, and 4# heald frames in sequence from the weaving opening to the rear direction of the machine. During drafting, the warp yarns sequentially penetrate into one heald frame from left to right. Specifically, the method comprises the following steps:

the 1 st penetrating heald frame is the 1# heald frame, the 2 nd penetrating heald frame is the 1# heald frame, the 3 rd penetrating heald frame is the 3# heald frame, and the 4 th penetrating heald frame is the 4# heald frame;

the 5 th penetrating heald frame is penetrated into the 1# heald frame, the 6 th penetrating heald frame is penetrated into the 2# heald frame, the 7 th penetrating heald frame is penetrated into the 3# heald frame, and the 8 th penetrating heald frame is penetrated into the 4# heald frame;

the 9 th penetrating heald frame is penetrated into the No. 1 heald frame, the 10 th penetrating heald frame is penetrated into the No. 2 heald frame, the 11 th penetrating heald frame is penetrated into the No. 3 heald frame, and the 12 th penetrating heald frame is penetrated into the No. 4 heald frame;

the 13 th penetrating heald frame is penetrated into the No. 1 heald frame, the 14 th penetrating heald frame is penetrated into the No. 2 heald frame, the 15 th penetrating heald frame is penetrated into the No. 3 heald frame, and the 16 th penetrating heald frame is penetrated into the No. 4 heald frame;

the 17 th penetrating heald frame is penetrated into the No. 1 heald frame, the 18 th penetrating heald frame is penetrated into the No. 2 heald frame, the 19 th penetrating heald frame is penetrated into the No. 3 heald frame, and the 20 th penetrating heald frame is penetrated into the No. 4 heald frame;

the 21 st penetrating 1# heald frame, the 22 nd penetrating 2# heald frame, the 23 rd penetrating 3# heald frame and the 24 th penetrating 4# heald frame.

The 25 th warp yarn starts to be the same as the first warp yarn threading method, and the process is circulated until all warp yarns are threaded.

2. Weft doubling scheme:

a. the loom is a two-color physical weft insertion channel, two colors of 1 and 2 can be selected actually, two paths of virtual colors are added to improve the loom into four selectable colors, and two paths of virtual colors of 3 and 4 are added; but the fabric only uses the first three colors and the fourth one is not used (other fabrics can be selected and called when needed). Using a design and color programmer of a weaving machine to compile a pattern card chart, namely a color selection sequence chart: color 1, color 2, color 3, color 1, color 3, color 2. When the loom operates, weft insertion is carried out in sequence by one weft per color (namely 1 step per color) according to the color selection sequence and the weft insertion is carried out all the time. It is noted that color 3 is a virtual weft yarn and that in reality there is no weft yarn insertion for this color.

b. The loom can be preset with four weft densities, and one of the four weft densities can be called for each weft in each color during weft insertion. Weft density 1 can be set to the weft density of a normal weave, such as 58 threads/inch; the weft density 2 is set to 0, indicating that winding is stopped. Setting weft densities 1 for calling all the designs and colors 1 at the same time when a design and color programmer of the weaving machine weaves a pattern card picture; the weft density 1 is called for all the designs and colors 2; and the weft density 2 is called for all the designs and colors 3.

c. The complete weft doubling is shown in FIG. 4; color 3 is a dummy weft yarn, no weft yarn is actually inserted into the fell, and the weft detecting unit is stopped to prevent the weft detecting unit from detecting no weft yarn, so that the weft detecting switch of color 3 is turned off.

Examples of typical tricot weave as described above are given below, with similar other variants.

A first part:

as shown in the weave diagram of fig. 1, the three lattices have a plain weave as a basic weave, and a longitudinal stripe of 3 warp yarns combined together appears in the warp direction at every 21 warp intervals, and the warp direction longitudinal stripe can be realized by the following method:

as shown in the fabric drafting diagram of fig. 5, the ground weave drawing-in method is changed from the conventional drawing-in 1, 2, 3, 4, 1, 2, 3, 4 … … to 1, 3, 4, 1, 2, 3, 4.

When weaving two vertical lattices or the number of the spacing warps is different, the spacing number can be changed according to actual needs, if the sum of the number of the spacing warps and the number of the doubling warps is odd, the possible cycle number is larger, if 23+2 common in the two vertical lattices is adopted, the cycle number can reach 100, and drafting can be realized through four pages of heald frames.

As shown in fig. 6 and 7, the two-color model is configured with 2 independent weft insertion channels, which are respectively color 1 and color 2, and weft yarns can be normally and continuously inserted according to the sequence of color 1, color 2, color 1 and color 2 … …; when doubling is needed, virtual weft 3 is introduced in a free weft selection mode after the weft insertion of the current weft is finished, and meanwhile, the weft density of the current virtual weft is changed into 0 by the real-time weft density changing function, so that a weaving opening stops moving forwards; the above steps are repeated to form the doubling of any number of weft yarns in one fell.

The common double union, triple union can be woven very smoothly by actual weaving. Because the real weft insertion is single-yarn weft insertion, the normal weft insertion air pressure can meet the requirement of weaving, each weft yarn can pass through the beating-up of the reed during doubling, the arrangement of the weft yarns after doubling is neat and regular, and the cloth cover style is good.

It should be noted that when the virtual weft yarn of color 3 is introduced, the weft yarn does not pass through the fell, which may cause the weft detection to fail and stop, so the weft detection function should have a weft detection switch which can be controlled independently for each color, and at this time, the weft detection of the virtual color 3 should be turned off.

From the practical weaving use condition, the double-parallel and triple-parallel weaving machine with 21S and 16S wefts at any interval can be smoothly implemented on the simplest crank shedding weaving machine with four pages of heald frames, the speed of the weaving machine can reach 750rpm, the efficiency is more than 90%, the yield is high, the cloth cover quality is excellent, the energy consumption is low, and the weaving machine can meet the weaving of common double-vertical-lattice and triple-vertical-lattice fabrics.

The weaving of various types of multi-warp and multi-weft fabrics by the scheme is also easy to realize for the weaving machine provided with the active cam openings and the passive cam openings. The scheme can realize that the expensive and low-speed electronic dobby loom is comprehensively replaced by the air-jet loom with lower configuration to weave the variety.

Claims

1. A weaving method for weaving a multi-warp multi-weft series fabric by using an air jet loom is characterized by comprising warp direction doubling and weft direction doubling operations;

the warp direction doubling adopts a drafting sequence method to weave;

2. The weaving method for weaving a multi-warp multi-weft series fabric using an air jet loom according to claim 1, characterized in that, in weft doubling, the weft insertion unit, the take-up unit and the weft detecting unit are completed in accordance with the edited pattern card combination:

3. The weaving method for weaving a multi-warp multi-weft series fabric using an air jet loom as claimed in claim 1, wherein the drawing-in sequence of the warp direction doubling is:

4. The weaving method for weaving a multi-warp multi-weft series fabric using an air jet loom as claimed in claim 1 or 3, characterized in that the warp direction doubling uses a four-leaf harness:

m warp yarns are arranged every n warp yarns and form longitudinal stripes together, the n warp yarns penetrate through each heald frame in a forward penetrating method according to the sequence of No. 1, No. 2, No. 3 and No. 4 heald frames and sequentially and circularly penetrate through the four heald frames, and the last warp yarn penetrates through the heald frame I; and the m warp yarns of the doubling are completely threaded on a heald frame i +1 or are distributed by a threading method of i +1, i +1 and i + m, then the next group of n warp yarns are sequentially threaded by taking the heald frame as a starting point, and the process is repeated until the complete warp yarns are threaded.

5. The weaving method for weaving a multi-warp multi-weft series fabric using an air jet loom according to claim 1 or 2, wherein the weft direction doubling is set to:

a) editing the pattern card: the weaving machine is a two-color physical weft insertion channel, the physical design and color of the design and color stripe board are two designs and colors of color 1 and color 2, and two paths of virtual design and color 3 and color 4 are additionally arranged; weaving a pattern card picture by using a pattern programmer of a weaving machine, wherein virtual patterns are adopted at parts needing weft doubling; when the loom operates, weft insertion is carried out in sequence by one weft per color according to the color selection sequence and the weft insertion is carried out all the time; setting the virtual design color as not to carry out weft yarn introduction;

b) weft density setting of the loom: during weft insertion, one weft density data can be called for each weft in each color, and the weft density 1 is set as the weft density of normal weaving; weft density 2 is set to 0, indicating that winding is stopped; setting weft density 1 for physical design and color in the design and color pattern board; weft density is transferred by virtual patterns 2;

c) in order to prevent the weft detecting unit from stopping without detecting weft, the weft detecting switch of the virtual design and color is closed.

6. A weaving method for weaving a multi-warp multi-weft series fabric using an air jet loom according to claim 5, characterized in that when the loom performs the execution of the virtual pattern, the weaving shed stops moving forward and no weft is inserted, and the weft detecting mechanism does not perform the weft detecting; when the weaving opening is opened again, one weft yarn which is already introduced by the previous weft yarn is arranged in the weaving opening, and the other weft yarn is introduced again to form two weft yarns in one weaving opening so as to realize double-weft yarn doubling; the execution of the virtual suit is repeated to form the doubling of any number of weft yarns in one weaving opening.