RU2304643C1 - Method for producing of multicolored stocking stitch jacquard structure for precise reproduction of original pattern repeat - Google Patents

Abstract

FIELD: textile industry.

SUBSTANCE: method involves charging loop-forming systems of knitting machine with variously colored threads and forming loops using each thread according to pattern repeat, with order of charging loop-forming systems of knitting machine with threads being preliminarily set in accordance with minimum total deviation of actual height of pattern repeat loops from height of pattern element.

EFFECT: increased precision in reproducing of original pattern repeat in web.

2 cl, 3 dwg

Description

The invention relates to the technology of knitwear production, namely to processes for producing patterned knitwear - culinary multi-color jacquard.

A known method of obtaining a regular multi-color jacquard, including dressing the loop-forming systems of a knitting machine with yarns of different colors and looping with each yarn according to the pattern repeat [Marisova O.I. Knitted patterned weave. - M: Light and food pr-st, 1984, S. 171-175]. The known method provides for obtaining a jacquard with limited patterned capabilities and insufficient accuracy of reproduction of the original picture in the canvas, since such a jacquard consists of loops of the same structure and composition.

There is also known a method of producing a culinary multicolor jacquard, including dressing the loop-forming systems of a knitting machine with yarns of different colors and looping with each yarn according to the pattern repeat [Marisova O.I. Knitted patterned weave. - M: Light and food pr-st, 1984, p.175-181], this yields a jacquard, which consists of loops that are different in structure and composition (irregular jacquard). The random order of filling the loop-forming systems of a knitted machine with yarns of different colors in the known method leads to insufficient accuracy of reproduction of the original picture in the canvas.

The accuracy of reproduction of the original pattern in a knitted fabric depends on the color combinations of adjacent loops in the column. When switching from color to color in one loop column, the height of the jacquard loop (its index) is determined by the number of systems not participating in the loop formation (and forming broaches behind the jacquard loop), since they are filled with threads of a color that is different from what is currently required. In this case, a structure is formed of jacquard loops of various heights, differing to a greater or lesser extent from the projected height of the original drawing element, with the correct color alternation of the elements according to the pattern repetition. This creates a total inaccuracy in the reproduction of the original image. Thus, the knitwear obtained in a known manner has insufficient accuracy in reproducing the original pattern in the fabric.

The technical result of the invention is the development of such a method for producing a culinary multi-color jacquard, which, through the introduction of new operations and the new operation of refueling the loop-forming systems of a knitted machine with yarns of different colors, would make it possible to obtain knitwear having a sufficiently high accuracy of reproducing the original pattern in the fabric.

The specified technical result is achieved by the fact that in the method for producing a culinary multicolor jacquard, which includes threading the loop forming systems of the knitted machine with different colors and making loops with each thread according to the pattern repeat, according to the invention, the order of filling the loop forming systems of the knitted machine with different colors is preliminarily determined, the total relative deviation is determined the actual height of the pattern repeat hinges from the height of the picture element and select the filling order corresponding to the minimum value of the total relative deviation of the actual height of the pattern rapport loops from the height of the pattern element.

It is advisable that the minimum value of the total relative deviation of the actual height of the pattern repeat loops from the height of the pattern element be determined by the formula:

where i, j are the color numbers of the vertically adjacent elements of the figure (i ≠ j);

N - jacquard color (number of systems included);

k is the kit number; number K + l is equivalent to number 1;

K is the number of sets;

S _{k, i} is the number of the kit system k dressed with a thread of color i;

Q _{k, i, j} - the number of color ij (i ≠ j) transitions falling on the k-th set;

R _l , R _c - the dimensions of the pattern in height and width;

- перестановки из N цветов в К комплектах, представляющие порядок заправки петлеобразующих систем трикотажной машины нитями разного цвета;

- permutations of N colors in K sets, representing the order of filling the loop-forming systems of a knitted machine with threads of different colors;

E is the minimum value of the total relative deviation of the actual height of the pattern repeat hinges from the height of the picture element.

Filling the loop-forming systems of the knitting machine with yarns of different colors in the order corresponding to the minimum value of the total relative deviation of the actual height of the pattern rapport loops from the height of the pattern element (E), reduces the number of loops with a high and small index, which allows to obtain knitwear with a sufficiently high accuracy reproduction of the original picture in the canvas. The value of E, determined by formula (1), allows you to guaranteedly find the refueling order corresponding to the minimum value of the total relative deviation of the actual height of the pattern rapport loops from the height of the pattern element, and when refueling looping systems with different color threads in accordance with this order and the subsequent formation of loops each thread, according to the pattern repeat, obtain a knitwear having a sufficiently high accuracy of reproduction of the original pattern in the canvas.

Figure 1 shows the original drawing, figure 2a shows a pattern reproduced in a knitted fabric at an arbitrary dressing order of looping systems of a knitted machine, which is shown in figure 2b, figure 3a shows a pattern reproduced in a knitted fabric and corresponding to the minimum the value of the total relative deviation of the actual height of the hinges of the rapport of the figure from the height of the element of the figure, Fig.3b is the filling order corresponding to the figure shown in figa.

For figures, column numbers (1 ... 19) and row numbers (1 ... 12) are indicated.

The method is as follows.

For this knitted machine having K sets of knitting and N systems in each set, and a given pattern repeat (Fig. 1, the size of the pattern in width Pc is the number of pattern elements in the row of length, in length - Rl is the number of pattern elements in the column of rapport ) establish the order of enumeration of various permutations of N elements in K groups. The total number of such permutations is (N!) ^K. For the considered example, K = 3, N = 4. The size of the rapport of the figure across the width R _s = 19, along the length R _l = 12. The total number of permutations is (4!) ³ = 13824.

As the first permutation, you can take, for example, the following refueling order: 1234, 1234, 1234 (this order is shown in Fig.2b).

For the second permutation, you can swap the last two colors in the last (third) set: 1234, 1234, 1243.

For the third permutation, you can swap the colors of the fourth with the second in the last (third) set 1234, 1234, 1432. And so on.

The last permutation will look like 4321, 4321, 4321.

The order of filling the loop-forming systems of the knitting machine with threads of different colors is set, choosing the first permutation 1234, 1234, 1234. Using the formula (1), the total relative deviation of the actual height of the pattern rapport loops from the height of the pattern element (expression in curly brackets) is determined. To do this, count the number of color transitions from color i to color j per each set, Qk, i, j. In our example, for three sets and 12 rows, each set will knit every third row. The 1st set knits the 1st, 4th, 7th and 10th rows, the second - 2nd, 5th, 8th and 11th, the third - 3rd, 6th, 9th and 12th. To determine the color transitions from set 1 to set 2, you need to consider the rows: 1st and 2nd, 4th and 5th, 7th and 8th, 10th and 11th. Determine the number of transitions from color 1 (light shading down) to color 4 (black) for set 1. 1-2 rows - no such transitions; 4-5 rows - two transitions (in 2 and 18 columns); 7-8 rows - there are no such color transitions; 10-11 rows - two transitions (8 and 12 columns). Thus, on the 1st set there are four color transitions 1-4, i.e. Q _{1, l, 4} = 4. Q _{k, i, j are} calculated for all K sets and all color ij transitions. For all color ij transitions, the value of the total relative deviation of the actual height of the pattern rapport loops from the height of the pattern element is determined. For the first permutation 1234, 1234, 1234, the deviation during the transition from color 1 to color 4 will be | 1-4 | /4=0.75 for one transition. Such transitions, as we calculated earlier, are 4. That is, for one transition and for one set, the total relative deviation of the actual height of the pattern rapport loops from the height of the picture element will be 3. Summing over K and N and relating the result to one element (the value in curly brackets of the formula (1)), we obtain the total relative deviation of the actual height of the pattern rapport loops from the height of the figure element 0.228.

The next permutation of colors is selected and the total relative deviation of the actual height of the pattern rapport loops from the height of the pattern element is calculated for it (total error in reproducing the original pattern in a knitted fabric). If the new value of the total relative deviation is less than the previous one, remember the new value of the total relative deviation and the corresponding permutation of colors (the procedure for filling the loop-forming systems of a knitted machine with threads of different colors).

The choice of the permutation of colors and the calculation of the error are repeated until all (N!) ^K permutations are completely enumerated, thus determining the permutation of the colors corresponding to the minimum value of the total relative deviation of the actual height of the pattern rapport loops from the height of the pattern element. This operation is reflected in formula (1) and is performed automatically on the computer.

Then, in accordance with the obtained permutation of colors (dressing order, see FIG. 3b), the loop-forming systems of the knitting machine are filled with threads of different colors and loops with each thread according to the pattern repetition.

The appearance obtained by the claimed method of multicolor jacquard is presented in figa. The minimum value of the total relative deviation of the actual height of the pattern rapport loops from the height of the pattern element is 0.109.

Thus, the proposed method will provide a culinary multi-color jacquard having a sufficiently high accuracy of reproduction of the original picture in the canvas.

Claims (2)

1. A method of producing a culinary multi-color jacquard for accurate reproduction of the original drawing, including threading the loop forming systems of the knitted machine with different colors and making loops with each thread according to the pattern repetition, characterized in that the order of filling the loop forming systems of the knitted machine with different colors is preliminarily determined, the total the relative deviation of the actual height of the pattern rapport loops from the height of the pattern element, and the filling order corresponding to min mal largest sum of relative deviation of the actual height of the loop pattern repeat the height of the pattern element. 2. The method according to claim 1, characterized in that the minimum value of the total relative deviation of the actual height of the loop of the rapport of the figure from the height of the element of the figure is determined by the formula

where i, j are the color numbers of the vertically adjacent elements of the figure (i ≠ j); N - jacquard color (number of systems included); k is the kit number; number K + 1 is equivalent to number 1; K is the number of sets; S _{k, i} is the number of the kit system k dressed with a thread of color i; Q _{k, i, j} is the number of color ij (i ≠ j) transitions falling on the k-th set; R ₁ , R _c - the dimensions of the pattern in height and width;

- permutations of N colors in K sets, representing the order of filling the loop-forming systems of a knitted machine with threads of different colors; E is the minimum value of the total relative deviation of the actual height of the pattern repeat hinges from the height of the picture element.

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