Elastic composite yarn

Abstract

To provide an elastic composite yarn with excellent elasticity, in which the stretchability of the high-stretch yarn is not hindered as much as possible by the low-stretch yarn. [Solution] The invention comprises a first loop row 17 in which a large number of loops 14 formed from low-stretch yarn 12 having low elongation form a row, and a second loop row 18 in which a large number of loops 14 formed from high-stretch yarn 13 having higher elongation than the low-stretch yarn 12 form a row, arranged along the first loop row 17. Each loop 14 in the first loop row 17 and each loop 14 in the second loop row 18 correspond sequentially to each other, and the corresponding loops 14 are connected via an intersection J where the low-stretch yarn 12 and high-stretch yarn 13 that constitute each loop 14 intersect.

Description

Technical Field

[0001] The present invention relates to an elastic composite yarn in which a low-elongation yarn and a high-elongation yarn are combined.

Background Art

[0002] Conventionally, as a composite yarn in which a low-elongation yarn with low elongation and a high-elongation yarn with high elongation are combined, one or two or more composite elastic yarns obtained by combining an inelastic yarn with low elasticity and an elastic yarn rich in elasticity are knitted so that loops (meshes) are continuously connected in the longitudinal direction, and a narrow string-like yarn is known (see, for example, Patent Document 1).

[0003] In the string-like yarn of Patent Document 1, any of a core-spun yarn, a covering yarn, and a false-twist type yarn is used as the composite elastic yarn. Such a composite elastic yarn is knitted with a knitting machine having one or two knitting needles to obtain a string-like yarn.

[0004] Also, Patent Document 1 exemplifies a string-like yarn knitted with a knitting machine having one needle by aligning an inelastic yarn and an elastic yarn as a composite elastic yarn. When knitting this string-like yarn, tension is applied to the elastic yarn, so in the knitted string-like yarn, each loop formed by the elastic yarn becomes small.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, since the string-like yarn of Patent Document 1 is obtained by knitting a composite elastic yarn in which an inelastic yarn and an elastic yarn are combined, or by aligning an inelastic yarn and an elastic yarn, this string-like yarn is formed as a knitted fabric in which loops (meshes) formed by the composite elastic yarn, or by aligning an inelastic yarn and an elastic yarn, are continuously connected in the length direction of the string-like yarn.

[0007] Therefore, each loop in the string-like yarn is composed of an inelastic thread and an elastic thread. As a result, the stretching and contracting of the elastic thread is constrained to some extent by the inelastic thread, and thus the elasticity of the string-like yarn is inhibited by the inelastic thread.

[0008] In view of the problems of the prior art, the object of the present invention is to provide an elastic composite yarn with excellent elasticity in which the elasticity of the high-elongation yarn is not hindered as much as possible by the low-elongation yarn. [Means for solving the problem]

[0009] The elastic composite yarn of the first invention comprises a first loop row, which is knitted so that a large number of loops formed from low-stretch yarns having low elongation form a single row, and a second loop row, which is knitted along the first loop row so that a large number of loops formed from high-stretch yarns having higher elongation than the low-stretch yarns form a single row.

[0010] Each loop in the first loop row and each loop in the second loop row correspond sequentially to each other, and the corresponding loops are connected via intersections where the low-stretch yarn and the high-stretch yarn that constitute each loop intersect.

[0011] The elastic composite yarn of the second invention comprises n (where n is a natural number) rows of low-stretch loops, each row in which a large number of loops formed from low-stretch yarns having a predetermined low elongation are knitted together in a single row, and m (where m is a natural number) rows of high-stretch loops, each row in which a large number of loops formed from high-stretch yarns having a higher elongation than the low-stretch yarns are knitted together in a single row along the row of low-stretch loops.

[0012] The loop rows n and m are adjacent to each other in an arbitrary order, forming a ring, and each loop in an adjacent loop row corresponds to each other, and the corresponding loops are connected via intersections where the low-stretch yarn or the high-stretch yarn that constitutes both intersect. [Effects of the Invention]

[0013] According to the elastic composite yarn of the first invention, the loops of the low-stretch yarn and the loops of the high-stretch yarn each separately form a first loop row and a second loop row, respectively. Therefore, the elasticity of the high-stretch yarn is not inhibited by the low-stretch yarn in each loop of the high-stretch yarn. Accordingly, the second loop row formed by the loops of the high-stretch yarn can stretch and contract without being inhibited by the first loop row formed by the low-stretch yarn.

[0014] On the other hand, in the first and second loop rows, low-stretch yarns and high-stretch yarns are connected via intersections for each corresponding loop. Therefore, as the second loop row expands and contracts, the first loop row expands and contracts as adjacent loops overlap or are released. Consequently, the elastic composite yarn of the present invention has excellent elasticity. A similar effect can be obtained with the elastic composite yarn of the second invention. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view showing the main parts of a knitting machine for knitting elastic composite yarn according to the first embodiment of the present invention. [Figure 2] This is a plan view showing the two knitting needles of the knitting machine shown in Figure 1. [Figure 3] Figure 1 is a perspective view showing the front end of the knitting machine. [Figure 4] Figure 1 is a first perspective view showing how elastic composite yarn is knitted using the knitting machine. [Figure 5] This is a second perspective view showing how elastic composite yarn is knitted using the knitting machine shown in Figure 1. [Figure 6] This is a third perspective view showing how elastic composite yarn is knitted using the knitting machine shown in Figure 1. [Figure 7] This is a fourth perspective view showing how elastic composite yarn is knitted using the knitting machine shown in Figure 1. [Figure 8] This figure shows the structure of the elastic composite yarn produced by the knitting machine shown in Figure 1. [Figure 9] This is an enlarged view showing the elastic composite yarn in its stretched state, knitted using the knitting machine shown in Figure 1. [Figure 10A] An enlarged view of an elastic composite yarn in a state where it is knitted by the knitting machine of FIG. 1 and its elongation is relaxed (contracted). [Figure 10B] A view showing an enlarged part of FIG. 10A. [Figure 11] A perspective view showing a main part of a knitting machine for knitting an elastic composite yarn according to a second embodiment of the present invention. [Figure 12] A perspective view showing the tip of the knitting machine of FIG. 11. [Figure 13] A view showing the structure of an elastic composite yarn knitted by the knitting machine of FIG. 11. [Figure 14] An enlarged view showing an elastic composite yarn knitted by the knitting machine of FIG. 11 in an extended state. [Figure 15A] A view showing an elastic composite yarn knitted by the knitting machine of FIG. 11 in a state where its elongation is relaxed (contracted). [Figure 15B] A view showing an enlarged part of FIG. 15A.

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a main part of a knitting machine for knitting an elastic composite yarn according to an embodiment of the first invention. This knitting machine #1 has a configuration as a circular knitting machine with a small number of knitting needles.

[0017] That is, as shown in FIG. 1, the knitting machine #1 includes a cylinder #2 that rotates around a rotation axis A, knitting needles #4a and #4b that are arranged to be vertically movable in a groove #3 provided along the rotation axis A on the outer periphery of the cylinder #2, and a first cam #5 and a second cam #6 that move the knitting needles #4a and #4b vertically in a direction along the rotation axis A, respectively.

[0018] The first cam 5 and the second cam 6 are formed as two cam grooves provided in the cam cylinder 7 (shown by a dashed line) which is positioned around the cylinder 2. The two cam grooves are formed to orbit on two planes that intersect the axis of rotation A. When these two planes are cut along the axis of rotation A, the two cutting lines have the same alternate interior angle with respect to the axis of rotation A.

[0019] Figure 2 shows knitting needles 4a (first knitting needle) and 4b (second knitting needle). As shown in Figure 2, knitting needles 4a and 4b are spatula needles having a hook 8 and a spatula 9 at their tips. Knitting needles 4a and 4b are equipped with cam followers 10a and 10b, respectively, which cooperate with the first cam 5 and the second cam 6. Knitting needles 4a and 4b are respectively positioned in grooves 3 located symmetrically with respect to the rotation axis A in the cylinder 2.

[0020] Knitting needles 4a and 4b have similar dimensions and shapes, but the positions of cam followers 10a and 10b in the longitudinal direction are different. The difference in the positions of cam followers 10a and 10b corresponds to the distance between the intersection points where the planes along the first cam 5 and the second cam 6 intersect the axis of rotation A.

[0021] Therefore, as cylinder 2 rotates within cam cylinder 7, knitting needles 4a and 4b move up and down simultaneously (with 360° different phases) according to cam followers 10a and 10b that follow the first cam 5 and second cam 6, respectively.

[0022] Figure 3 shows the upper end of the knitting machine 1 in Figure 1, viewed from an oblique angle above. As shown in Figure 3, low-stretch yarn 12 having a predetermined low elongation is supplied to the knitting needle 4a through one of the two yarn supply ports 11, which are positioned symmetrically with respect to the rotation axis A of the cylinder 2. High-stretch yarn 13 having a predetermined high elongation, higher than the low-stretch yarn 12, is supplied to the knitting needle 4b through the other yarn supply port 11.

[0023] For example, polyethylene yarn can be used as the low-stretch yarn 12. For example, polyurethane yarn can be used as the high-stretch yarn 13. In addition, twisted yarn, covering yarn, lily yarn, braided yarn, or false-twisted yarn can be used as the low-stretch yarn 12 or the high-stretch yarn 13.

[0024] Figures 4 to 7 show how the elastic composite yarn is knitted using the knitting machine shown in Figure 1. In Figure 4, the tips of knitting needles 4a and 4b are shown passing upward through the newly formed upper loops (mesh) 14 made of the corresponding low-stretch yarn 12 and high-stretch yarn 13, respectively, and are positioned near the top.

[0025] Figure 5 shows that the cylinder 2 has rotated approximately 90° from the state in Figure 4, and that the knitting needles 4a and 4b are attempting to pull in the low-stretch yarn 12 and the high-stretch yarn 13, respectively.

[0026] Figure 6 shows that the cylinder 2 has rotated approximately 90° further from the state in Figure 5, and that the knitting needles 4a and 4b have passed downwards through the upper loops 14 made of the low-stretch yarn 12 and high-stretch yarn 13, respectively, forming new loops. This passing is easily accomplished because the spatulas 9 of each of the knitting needles 4a and 4b are rotated upward due to friction with the loops 14.

[0027] Figure 7 shows that the cylinder 2 has rotated approximately 90° further from the state in Figure 6, and the tips of the knitting needles 4a and 4b are attempting to pass through the new loop 14 from above. This passing is easily accomplished because the spatula 9 rotates downward. Once this passing is complete, the cylinder 2 rotates approximately 90° further, and the knitting needles 4a and 4b return to the state in Figure 4.

[0028] In this way, each time the cylinder 2 rotates 360°, the knitting needles 4a and 4b sequentially form loops 14 of the low-stretch yarn 12 and the high-stretch yarn 13, respectively, forming an elastic composite yarn in which rows of loops 14 made of the low-stretch yarn 12 and rows of loops 14 made of the high-stretch yarn 13 are arranged in parallel.

[0029] Figure 8 shows a magnified view of the structure 15 of the elastic composite yarn formed in this manner. However, in order to make this structure 15 easier to understand, Figure 8 shows a knitted yarn using sewing thread as the low-stretch yarn instead of the low-stretch yarn 12 and the high-stretch yarn 13. For convenience, one sewing thread will be referred to as the low-stretch yarn 12, the other as the high-stretch yarn 13, and the knitted yarn as the elastic composite yarn 16.

[0030] As shown in Figure 8, this elastic composite yarn 16 comprises a first loop row 17 in which numerous loops 14 formed from low-stretch yarn 12 form a single row, and a second loop row 18 in which numerous loops 14 formed from high-stretch yarn 13 form a single row, and is knitted along the first loop row 17. Each loop 14 in the first loop row 17 and each loop 14 in the second loop row 18 correspond sequentially to each other.

[0031] The corresponding loops 14 are connected via intersections J where the low-stretch yarn 12 and high-stretch yarn 13 constituting each loop 14 intersect. The first loop row 17 is knitted using the low-stretch yarn 12 supplied to the knitting needle 4a which is moved up and down by the first cam 5. The second loop row 18 is knitted using the high-stretch yarn 13 supplied to the knitting needle 4b which is moved up and down by the second cam 6.

[0032] The intersection J where the low-stretch yarn 12 and the high-stretch yarn 13 intersect is formed when the knitting machine 1 knits the first loop row 17 and the second loop row 18.

[0033] Figure 9 shows the stretched state of an elastic composite yarn 16, which is knitted in the same manner as in Figure 8, except that polyurethane yarn 20 is used as the high-stretch yarn 13 and polyester yarn 21 is used as the low-stretch yarn 12.

[0034] As shown in Figure 9, in the stretched elastic composite yarn 16 knitted on the knitting machine 1 while stretching the polyurethane yarn 20, the second loop row 18 made of polyurethane yarn 20 is stretched in a straight line, and the loops 14 of polyurethane yarn 20 are also stretched. In contrast, the first loop row 17 made of polyester yarn 21 exhibits a state in which the loops (mesh) 14 are arranged sequentially in the stretching direction.

[0035] Figure 10A shows the state of the elastic composite yarn 16 in Figure 9 after knitting is complete and the elongation of the polyester yarn 21 has been relieved (contracted). Figure 10B shows a magnified portion of Figure 10A. In this state, the second loop row 18 made of polyurethane yarn 20 is slightly loosened but maintains an almost straight shape.

[0036] In contrast, in the first loop row 17 made of polyester yarn 21, adjacent loops 14 overlap sequentially and are sequentially bound together by nearly straight polyurethane yarn 20.

[0037] From Figures 9, 10A, and 10B, it can be seen that the polyurethane yarn 20 stretches and contracts in accordance with its elasticity, and at the same time, the rows of loops (mesh) 14 of the polyester yarn 21 also stretch and contract accordingly. Therefore, it can be understood that the elastic composite yarn 16 in Figures 9, 10A, and 10B stretches and contracts in accordance with the elasticity of the polyurethane yarn 20 without impairing its own elasticity.

[0038] As described above, according to this embodiment, the elastic composite yarn 16 has a first loop row 17 formed of polyester yarn 21 as a low-stretch yarn 12 and a second loop row 18 formed of polyurethane yarn 20 as a high-stretch yarn 13. The first loop row 17 and the second loop row 18 are connected via intersections for each corresponding loop 14.

[0039] Therefore, the elasticity of the polyurethane yarn 20 is not hindered by the polyester yarn 21. Consequently, when the draft (stretching) of the polyurethane yarn 20 that was applied during knitting is released, the loops 14 of the polyester yarn 21 are efficiently folded so that they overlap sequentially, resulting in an elastic composite yarn 16 with good elasticity.

[0040] Figure 11 shows the main part of a knitting machine 1b for knitting elastic composite yarn according to one embodiment of the second invention. Figure 12 shows the tip of the knitting machine 1b. This embodiment is a case in which the low-stretch loop rows of the second invention are 2 rows (n=2) and the high-stretch loop rows are 2 rows (m=2), and the low-stretch loop rows and high-stretch loop rows are alternately adjacent to each other to form a ring.

[0041] Therefore, as shown in Figures 11 and 12, the knitting machine 1b differs from the knitting machine 1 in the embodiment of the first invention described above in that it has two knitting needles 4c and 4d as first knitting needles, and two knitting needles 4e and 4f as second knitting needles.

[0042] The knitting needles 4c and 4d have the same shape as the knitting needle 4a in Figure 2 and are each equipped with cam followers 10c and 10d that cooperate with the first cam 5. The knitting needles 4c and 4d are each positioned symmetrically with respect to the rotation axis A of the cylinder 2 and are arranged to move up and down within two grooves 3 on the periphery of the cylinder 2.

[0043] The knitting needles 4e and 4f have the same shape as the knitting needle 4b in Figure 2 and are each equipped with cam followers 10e and 10f that cooperate with the second cam 6. The knitting needles 4e and 4f are each positioned to move up and down freely within two grooves 3 around the cylinder 2, which are located symmetrically with respect to the rotation axis A of the cylinder 2. However, the circumferential positions of the knitting needles 4c, 4e, 4d, and 4f differ by 90° in this order.

[0044] In other words, the knitting machine 1b is configured such that each time the cylinder 2 is rotated 90° inside the cam cylinder 7, the knitting needles 4c to 4f move up and down sequentially in the order of knitting needle 4c, knitting needle 4e, knitting needle 4d, and knitting needle 4f with a phase difference of 90°. Low-stretch yarn 12 is supplied to knitting needles 4c and 4d, and high-stretch yarn 13 is supplied to knitting needles 4e and 4f.

[0045] Figure 12 shows the operational state of knitting needles 4c to 4f at a certain point in time. Specifically, knitting needle 4c has passed through the loop 14 of the low-stretch yarn 12 and reached its highest position. Also, knitting needle 4d, which is 180° out of phase with knitting needle 4c, has passed through loop 14 and is forming a new loop 14. Furthermore, knitting needle 4e is pulling in the high-stretch yarn 13 and attempting to pass through the loop 14 of the high-stretch yarn 13 downwards. Also, knitting needle 4f is attempting to pass through the loop 14 it has formed upwards.

[0046] In this way, the knitting needles 4c to 4f form four loops (mesh) 14 for each rotation of the cylinder 2, and the elastic composite yarn is knitted. Other aspects of the knitting machine 1b are the same as those of the knitting machine 1 in the embodiment of the first invention.

[0047] Figure 13 shows a magnified view of the structure 22 of the elastic composite yarn 16b knitted by the knitting machine 1b. To illustrate this structure clearly, instead of the low-stretch yarn 12 and the high-stretch yarn 13, sewing threads are used as low-stretch yarns for both, and a yarn with this structure is knitted. For convenience, one sewing thread will be referred to as the low-stretch yarn 12, the other as the high-stretch yarn 13, and the knitted yarn as the elastic composite yarn 16b.

[0048] This elastic composite yarn 16b includes rows of low-stretch loops 19c, 19d formed in the longitudinal direction of the elastic composite yarn 16b by the low-stretch yarn 12 supplied to the knitting needles 4c, 4d, which are moved up and down by the first cam 5. The rows of loops 19c, 19d are offset in the longitudinal direction by about half the length of one loop 14c or 14d, corresponding to the phase difference of 180° of the up and down movement between the knitting needles 4c, 4d described above.

[0049] Furthermore, the knitting needles 4e and 4f, which are moved up and down by the second cam 6, provide high-stretch loop rows 19e and 19f that are formed in the longitudinal direction of the elastic composite yarn 16b using the high-stretch yarn 13 supplied to these knitting needles. The loop rows 19e and 19f are also offset in the longitudinal direction, similar to the case of the loop rows 19c and 19d described above. The two rows of low-stretch loop rows 19c and 19d and the two rows of high-stretch loop rows 19e and 19f form a ring and are adjacent to each other in the order of loop rows 19c, 19e, 19d, and 19f.

[0050] Furthermore, since each loop row 19c to 19f has one loop 14c to 14f formed per rotation of cylinder 2, the average pitch P between each of the loops 14c, 14e, 14d, and 14f is L / 4, where L is the average pitch (average length) of one loop 14c, 14e, 14d, or 14f.

[0051] In other words, the loops 14c, 14e, 14d, and 14f formed per rotation of cylinder 2 correspond sequentially with an average shift of L / (n+m). The corresponding loops 14c, 14e, 14d, and 14f are connected to each other via intersections where the low-stretch yarns or high-stretch yarns that constitute them intersect.

[0052] Figure 14 shows the stretched state of an elastic composite yarn 16b, which is knitted using polyurethane yarn as the high-stretch yarn 13 and polyester yarn as the low-stretch yarn 12. As shown in Figure 14, in the stretched state of the elastic composite yarn 16b, the polyurethane yarn 20 is stretched in a linear manner, and the loops (mesh) 14e and 14f formed by the polyurethane yarn 20 are also stretched in a linear manner. On the other hand, the polyester yarn 21 exhibits a state in which the loops (mesh) 14c and 14d are arranged in two rows, loop rows 19c and 19d, respectively, in the direction of stretching, similar to the case in Figure 13.

[0053] Figure 15A shows the elastic composite yarn 16b from Figure 14 after knitting is complete and its stretched state has been relaxed (contracted). Figure 15B is an enlarged view of a portion of Figure 15A. As shown in Figures 15A and 15B, in the relaxed state of the elastic composite yarn 16b, the polyurethane yarn 20 is slightly loosened but maintains an almost straight shape.

[0054] In contrast, in the polyester yarn 21, loops 14c and 14d in loop rows 19c and 19d, respectively, are sequentially overlapped in the longitudinal direction of the elastic composite yarn 16b. However, there is no change in the connection structure between the polyester yarn 21 and the polyurethane yarn 20 as shown in Figure 13, and loop rows 19c to 19f are connected in the width direction (circumferential direction) via the intersection of the polyester yarn 21 and the polyurethane yarn 20.

[0055] Therefore, in the elastic composite yarn 16b, the loop rows 19e and 19f (see Figure 13) made of polyurethane yarn 20 stretch according to their elasticity, and at the same time, the loop rows 19c and 19d made of polyester yarn 21 stretch in accordance with this, as the loops (mesh) 14c and 14d overlap and unoverlap, respectively. Thus, it can be understood that the elastic composite yarn 16b stretches freely in accordance with the elasticity of the polyurethane yarn 20 without impairing its elasticity.

[0056] As described above, according to this embodiment, the elastic composite yarn 16b has loop rows 19c and 19d formed by polyester yarn 21, which is a low-stretch yarn 12, and loop rows 19e and 19f formed by polyurethane yarn 20, which is a high-stretch yarn 13, and a loop (mesh) is formed in each loop row. Each loop row is connected laterally (circumferentially) in units of the corresponding loops 14c to 14f.

[0057] Therefore, the elasticity of the high-stretch yarn 13 is not hindered by the low-stretch yarn 12. Consequently, when the draft (stretching) applied to the high-stretch yarn 13 during knitting is released, the low-stretch yarn 12 is efficiently folded, resulting in an elastic composite yarn 16b with good elasticity.

[0058] It should be noted that the present invention is not limited to the above embodiments. For example, the number of cams constituting the knitting machine is not limited to two, but may be three or more. In this case, different high-stretch yarns or low-stretch yarns may be supplied to the knitting needles that are moved up and down by each cam. Also, the number of knitting needles that are moved up and down by one cam may be three or more. Furthermore, the knitting needles are not limited to spinner needles, but may be compound needles or the like. In addition, the knitting machine may be of a type in which the cylinder is fixed and the cam cylinder rotates around the cylinder together with the yarn supply port.

[0059] Furthermore, the order in which the low-stretch loop rows and high-stretch loop rows are sequentially adjacent in a ring-like structure may be random. For example, the order may be loop rows 19c, 19d, 19e, and 19f. Also, by changing the ratio of the number of low-stretch loop rows (n) to the number of high-stretch loop rows (m) in the elastic composite yarn, elastic composite yarns with different elasticity and appearance (such as spiral) may be constructed.

[0060] Furthermore, the elastic composite yarn may have an odd number of rows in total: the sum of the number of low-stretch loop rows (n) and the number of high-stretch loop rows (m). For example, the elastic composite yarn may consist of one or two rows of low-stretch loops and two or one row of high-stretch loops, respectively.

[0061] Furthermore, when knitting the elastic composite yarn, the first and second knitting needles, which move up and down according to different trajectories controlled by the first cam 5 and the second cam 6 respectively, are used to knit the low-stretch yarn 12 and the high-stretch yarn 13. As long as the correspondence between the cams, knitting needles, and yarns is satisfied, the knitting needles do not necessarily need to be arranged at equal intervals around the cylinder 2.

[0062] Furthermore, as long as the above correspondence is satisfied, any number and combination of needles can be used for both the first and second knitting needles. For example, combinations such as one first knitting needle (low-stretch yarn 12) and three second knitting needles (high-stretch yarn), three first knitting needles (low-stretch yarn) and one second knitting needle (high-stretch yarn), or four first knitting needles (low-stretch yarn 12) and two second knitting needles (high-stretch yarn) are possible.

[0063] However, increasing the number of knitting needles can lead to problems such as the elastic composite yarn becoming flatter and the distance of the stitches, which affects the elasticity of the elastic composite yarn, becoming shorter. Therefore, from a practical standpoint, it is preferable to use no more than about eight knitting needles. [Explanation of Symbols]

[0064] 1, 1b... Knitting machine, 2... Cylinder, 3... Groove, 4a~4f... Knitting needle, 5... First cam, 6... Second cam, 7... Cam cylinder, 8... Hook, 9... Spatula, 10a~10f... Cam follower, 11... Yarn supply port, 12... Low stretch yarn, 13... High stretch yarn, 14, 14c~14f... Loop (mesh), 15, 22... Structure, 16, 16b... Elastic composite yarn, 17... First loop row, 18... Second loop row, 19c~19f... Loop row, 20... Polyurethane yarn, 21... Polyester yarn, A... Rotation axis, J... Intersection.

Claims

1. A first loop row is formed by knitting together numerous loops made of low-stretch yarn having low elongation, The system comprises a second loop row knitted along the first loop row such that a large number of loops formed from high-stretch yarns, which have a higher elongation than the low-stretch yarns, form a single row. Each loop in the first loop sequence and each loop in the second loop sequence correspond sequentially to each other, An elastic composite yarn characterized in that the corresponding loops are connected via intersections where the low-stretch yarn and the high-stretch yarn constituting each loop intersect.

2. A first loop row knitted so that a number of loops formed of low-stretch yarn having low elongation form a row, The system comprises a second loop row knitted along the first loop row such that a large number of loops formed from high-stretch yarns, which have a higher elongation than the low-stretch yarns, form a single row. Each loop in the first loop sequence and each loop in the second loop sequence correspond sequentially to each other, A method for manufacturing an elastic composite yarn, wherein the corresponding loops are connected via intersections where the low-stretch yarn and the high-stretch yarn constituting each loop intersect, The elastic composite yarn is knitted using a knitting machine having a first knitting needle and a second knitting needle arranged on the outer circumference of a cylinder along the rotation axis of the cylinder, and a first cam and a second cam that move the first knitting needle and the second knitting needle up and down along the rotation axis, respectively, when the cylinder rotates. The first loop row is knitted using the low-stretch yarn supplied to the first knitting needle which is moved up and down by the first cam. A method for manufacturing elastic composite yarn, characterized in that the second loop row is knitted using the high-stretch yarn supplied to the second knitting needle which is moved up and down by the second cam.

3. A row of low-stretch loops, formed by arranging numerous loops made of low-stretch yarn having a predetermined low elongation in a single row, is called an n-row (where n is a natural number) row. The system comprises m (where m is a natural number) rows of high-stretch loops, each row being formed from a high-stretch yarn with higher elongation than the low-stretch yarn, such that a large number of loops are connected in a single row along the low-stretch loop row. The aforementioned loop columns n and m are adjacent to each other in an arbitrary order, forming a ring. Each loop in the adjacent loop sequence corresponds to the others, An elastic composite yarn characterized in that the corresponding loops are connected via intersections where the low-stretch yarns or high-stretch yarns constituting each of them intersect.

4. The elastic composite yarn according to claim 3, characterized in that the average length of one loop in each low-elongation loop row and each high-elongation loop row is the same, and if the average length is L, then the loops in sequentially adjacent loop rows correspond to each other with an average shift of L / (n+m).

5. A row of low-stretch loops, in which a large number of loops formed from low-stretch yarn having a predetermined low elongation are knitted in a row, is called n (where n is a natural number) rows of low-stretch loops, The system comprises m (where m is a natural number) rows of high-stretch loops, each row being formed from a high-stretch yarn with higher elongation than the low-stretch yarn, such that a large number of loops are connected in a single row along the low-stretch loop row. The aforementioned loop columns n and m are adjacent to each other in an arbitrary order, forming a ring. Each loop in the adjacent loop sequence corresponds to the others, The corresponding loops are connected via intersections where the low-stretch yarns or high-stretch yarns that constitute each of them intersect. A method for manufacturing an elastic composite yarn, wherein the average length of one loop in each low-elongation loop row and each high-elongation loop row is the same, and if the average length is L, the loops in sequentially adjacent loop rows correspond to each other with an average shift of L / (n+m), The elastic composite yarn is knitted by a knitting machine having n first knitting needles, the same number as the n rows and m second knitting needles, the same number as the m rows, arranged on the outer circumference of a cylinder along the rotation axis of the cylinder, and a first cam and a second cam that move the n first knitting needles and the m second knitting needles up and down along the rotation axis, respectively, when the cylinder rotates. The low-stretch loop row is knitted using the low-stretch yarn supplied to the first knitting needle which is moved up and down by the first cam. A method for manufacturing elastic composite yarn, characterized in that the aforementioned high-elongation loop row is knitted using the high-elongation yarn supplied to the second knitting needle which is moved up and down by the second cam.

6. The low-stretch yarn or the high-stretch yarn may be a twisted yarn, a covering yarn, a lily yarn, a braided yarn, or The elastic composite yarn according to claim 1, 3, or 4, characterized in that it is a false twist yarn.

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