Double lift shedding device for jacquard loom and method of using same

Abstract

The application provides a double-stroke lifting motion device of a jacquard loom and a use method thereof. The device comprises, from top to bottom, a jacquard head, a first harness cord, a double-stroke lifting motion assembly, a second harness cord and a multi-harness-eye harness. The double-stroke lifting motion assembly comprises a plurality of double-stroke lifting motion units. Each double-stroke lifting motion unit comprises a fixed shell, a fixed pulley set, a movable pulley set and a fixed block arranged in the fixed shell from top to bottom. The movable pulley set comprises a first movable pulley and a second movable pulley connected in series. A first connecting cord is connected between the first movable pulley and the fixed pulley set, and the two ends of the first connecting cord are connected with the first harness cord respectively. A second connecting cord is connected between the second movable pulley and the fixed block, one end of the second connecting cord is connected with the fixed block, and the other end is connected with the second harness cord. While achieving double-stroke lifting motion, the lifting height of the multi-harness-eye harness is twice the lifting height of the first movable pulley and the second movable pulley, the lifting efficiency is higher, and the energy consumption is lower.

Description

Technical Field

[0001] This invention relates to the field of high-performance fiber weaving equipment technology, and in particular to a double-stroke heddle lifting device for a jacquard loom and its usage method. Background Technology

[0002] For multi-layered fabrics, with the warp yarn density of a single layer remaining constant, the number of warp yarns increases with the number of fabric layers, resulting in a higher warp yarn density per unit distance in the woven fabric. However, a higher warp yarn density leads to continuous friction, entanglement, and twisting between the yarns during the weaving process, which not only reduces the strength of the yarns but can also affect the entire manufacturing process.

[0003] To reduce warp density, warp yarns need to be arranged in layers when weaving multi-layered fabrics. This layering is typically achieved using multi-harness heddles. However, in multi-harness looms, the heddles require two strokes ("upper-middle" and "middle-lower") and three pauses ("upper," "middle," and "lower") to complete the weaving. Traditional jacquard looms, however, only have one stroke ("upper-lower") and two pauses ("upper" and "lower"). Therefore, to successfully weave multi-layered fabrics, the jacquard loom needs optimization to enable double-stroke heddle lifting, thus facilitating the weaving of multi-layered, thick fabrics.

[0004] Patent application CN101323997A discloses a double-opening method and device for a multi-arm mechanism on a loom. This device uses a movable pulley installed between the drawbars and the heddle frame, with two drawbars controlling one pulley, thereby controlling the heddle frame to achieve double-opening movement. While this device can achieve two movement strokes for the heddle yarns—"upper-middle" and "middle-lower"—and pause at three positions ("upper," "middle," and "lower"), the single-opening stroke of the heddle frame is only half that of the multi-arm mechanism, resulting in relatively high energy consumption. Furthermore, it is difficult to weave thick, multi-layered fabrics with 4 or more heddle loops.

[0005] Patent CN106319717B discloses a novel heddle-lifting mechanism for a three-dimensional fabric loom. This device continuously lifts the heddle frame using cylinders and completes the "upper-middle" and "middle-lower" motions of the heddle yarns via a dual-cylinder power unit. It can also pause at three positions: "upper," "middle," and "lower." However, the device's operating speed is limited by the cylinder's speed, and it requires an air supply system during production, resulting in high production costs and low equipment efficiency.

[0006] In view of this, it is necessary to design an improved double-stroke heddle-lifting device for jacquard looms and its usage method to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a double-stroke heddle lifting device for a jacquard loom and its method of use. By setting a double-stroke heddle lifting component between the jacquard head and the multi-heddle yarn, the double-stroke heddle lifting component achieves double-stroke lifting of the multi-heddle yarn through the cooperation of fixed pulleys, movable pulleys and connecting ropes. At the same time, the lifting height of the multi-heddle yarn each time is twice that of the first movable pulley and the second movable pulley. While achieving double stroke, the lifting efficiency is higher and the energy consumption is lower.

[0008] To achieve the above-mentioned objectives, the present invention provides a double-stroke heddle lifting device for a jacquard loom, comprising a jacquard head, a first heddle rope, a double-stroke heddle lifting assembly, a second heddle rope, and multi-heddle yarns connected sequentially from top to bottom.

[0009] The double-stroke heald lifting assembly includes several double-stroke heald lifting units. Each double-stroke heald lifting unit includes a fixed housing and, from top to bottom, a fixed pulley group, a movable pulley group, and a fixed block arranged in the fixed housing. The movable pulley group includes a first movable pulley and a second movable pulley connected vertically. A first connecting rope connects the first movable pulley and the fixed pulley group, and both ends of the first connecting rope are respectively connected to the first heald rope. A second connecting rope connects the second movable pulley and the fixed block, with one end of the second connecting rope connected to the fixed block and the other end connected to the second heald rope.

[0010] As a further improvement of the present invention, the fixed pulley group includes a first fixed pulley, a second fixed pulley, a third fixed pulley and a fourth fixed pulley; the first fixed pulley and the second fixed pulley are arranged vertically, the third fixed pulley and the fourth fixed pulley are arranged vertically, and the first fixed pulley and the third fixed pulley are at the same height, and the second fixed pulley and the fourth fixed pulley are at the same height;

[0011] The first connecting rope passes through the first fixed pulley, the second fixed pulley, the first movable pulley, the third fixed pulley, and the fourth fixed pulley in sequence, and is connected to the first heddle rope.

[0012] As a further improvement of the present invention, the double-stroke lifting assembly further includes a fifth fixed pulley disposed below the fixed shell; the second connecting rope passes sequentially through the fixed block, the second moving pulley and the fifth fixed pulley, and is connected to the second heddle rope.

[0013] As a further improvement of the present invention, a fixing frame is also provided on the outside of the double-stroke lifting assembly, the fixing frame being used to position the double-stroke lifting assembly.

[0014] As a further improvement of the present invention, the fixing frame includes a support frame and an upper positioning plate and a lower positioning plate respectively disposed above and below the support frame; both the upper positioning plate and the lower positioning plate are provided with a plurality of positioning holes, and the first heddle rope and the second heddle rope pass through the positioning holes on the upper positioning plate and the lower positioning plate respectively to realize the positioning of the double stroke lifting assembly.

[0015] As a further improvement of the present invention, the height of the support frame is adjustable so that the distance between the upper positioning plate and the lower positioning plate is adjustable.

[0016] As a further improvement of the present invention, the outer diameter of the first movable pulley and the second movable pulley is 7-9mm, the inner diameter is 4-6mm, and the total thickness is 4-6mm.

[0017] As a further improvement of the present invention, the upper positioning plate and the lower positioning plate are made of one or more of nylon, polytetrafluoroethylene or bakelite.

[0018] To achieve the above-mentioned objectives, the present invention also provides a method for using the aforementioned double-stroke heddle-lifting device on a jacquard loom, comprising the following steps:

[0019] S1. Connect the first heddle cord below the jacquard head to the first connecting cord in sequence; connect the two ends of the second heddle cord to the second connecting cord and the multi-eye heddle wire respectively;

[0020] S2. Raise one end of the first connecting rope to a height of n, and both the first movable pulley and the second movable pulley rise to a height of n / 2. The movement stroke of the second connecting rope is n, and the multi-eye heddle wire is raised to a height of n to achieve the first movement stroke.

[0021] S3. Raise the other end of the first connecting rope by n heights, and the first and second movable pulleys continue to rise by n / 2 heights. The movement stroke of the second connecting rope is n, and the multi-eye heddle wire is raised by n heights again to achieve the second movement stroke.

[0022] As a further improvement of the present invention, the lifting height of the multi-eye heddle wire is twice that of the first movable pulley and the second movable pulley.

[0023] The beneficial effects of this invention are:

[0024] (1) The jacquard loom double-stroke heddle lifting device provided by the present invention is provided by setting a double-stroke heddle lifting assembly between the jacquard head and the multi-heddle yarn. The double-stroke heddle lifting assembly includes several double-stroke heddle lifting units. Each double-stroke heddle lifting unit includes a fixed shell and a fixed pulley group, a movable pulley group and a fixed block arranged from top to bottom in the fixed shell. The movable pulley group includes a first movable pulley and a second movable pulley connected vertically. A first connecting rope is connected between the first movable pulley and the fixed pulley group. The two ends of the first connecting rope are respectively connected to the first heddle rope, that is, one first connecting rope is connected to two first heddle ropes. A second connecting rope is connected between the second movable pulley and the fixed block. One end of the second connecting rope is connected to the fixed block and the other end is connected to a second heddle rope. That is, one end of each second connecting rope is fixed and the other end is connected to a second heddle rope.

[0025] First, during the lifting process, the lifting height of the two ends of the first connecting rope can be adjusted to lift the multi-hedron helium wire by a preset distance each time, thereby achieving a double-stroke lifting of the multi-hedron helium wire. This allows the multi-hedron helium wire to have two strokes, "upper middle" and "middle lower", and to pause at three positions: "upper", "middle", and "lower".

[0026] Secondly, the lifting height of the multi-hedron helium wire is twice that of the first and second movable pulleys. That is, when one of the two first helium ropes connected to the end of the first connecting rope is lifted n times, the multi-hedron helium wire can be lifted n times. When the other first helium rope is lifted n times, the multi-hedron helium wire is lifted a total of 2n times. While achieving double stroke, the lifting efficiency is higher and the energy consumption is lower.

[0027] (2) The jacquard loom double-stroke heddle lifting device provided by the present invention solves the problem that the traditional jacquard loom cannot achieve double-stroke movement. By setting a double-stroke heddle lifting component between the jacquard loom and the multi-heddle yarn, the double-stroke heddle lifting component is used to realize multi-hed weaving, providing a new idea for the preparation of multi-layer fabrics. The use of an independent jacquard loom double-stroke heddle lifting device eliminates the need to modify the weaving equipment, reducing equipment costs. Through the jacquard loom and the double-stroke heddle lifting component, two independent but complementary and interactive lifting mechanisms, the preparation of multi-layer fabrics is realized, improving the overall efficiency and production capacity of the loom. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the double-stroke heddle-lifting device for jacquard looms according to the present invention.

[0029] Figure 2 for Figure 1 A schematic diagram of a double-stroke lifting unit.

[0030] Figure 3 for Figure 1 A three-dimensional view of the central fixed frame.

[0031] Figure 4 This is a connection diagram of the double-stroke lifting assembly and the fixing frame.

[0032] Figure 5 The following are structural diagrams of the double-stroke lifting unit group from different perspectives in the embodiment; 5a is a three-dimensional view and 5b is a cross-sectional view.

[0033] Figure Labels

[0034] 1-Jacquard head; 2-First heald rope; 3-Double stroke heald assembly; 4-Second heald rope; 5-Multi-eye heald wire; 6-Fixed frame; 31-Fixed shell; 32-Fixed pulley block; 33-Modible pulley block; 34-Fixed block; 35-First connecting rope; 36-Second connecting rope; 37-Fifth fixed pulley; 38-Connecting block; 61-Support frame; 62-Upper positioning plate; 63-Lower positioning plate; 64-Positioning hole; 321-First fixed pulley; 322-Second fixed pulley; 323-Third fixed pulley; 324-Fourth fixed pulley; 331-First movable pulley; 332-Second movable pulley. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0037] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Please see Figures 1 to 5 As shown, the present invention provides a double-stroke heddle lifting device for a jacquard loom, comprising a jacquard head 1, a first heddle rope 2, a double-stroke heddle lifting assembly 3, a second heddle rope 4, and a multi-heddle yarn 5 connected sequentially from top to bottom.

[0039] The double-stroke heddle lifting assembly 3 includes several double-stroke heddle lifting units. Each double-stroke heddle lifting unit includes a fixed housing 31 and, from top to bottom, a fixed pulley group 32, a movable pulley group 33, and a fixed block 34 arranged in the fixed housing 31. The movable pulley group 33 includes a first movable pulley 331 and a second movable pulley 332 connected vertically, that is, the first movable pulley 331 and the second movable pulley 332 move up and down simultaneously. A first connecting rope 35 is connected between the first movable pulley 331 and the fixed pulley group 32. The two ends of the first connecting rope 35 are respectively connected to the first heddle rope 2, that is, one first connecting rope 35 is connected to two first heddle ropes 2. A second connecting rope 36 is connected between the second movable pulley 332 and the fixed block 34. One end of the second connecting rope 36 is connected to the fixed block 34, and the other end is connected to a second heddle rope 4, that is, one end of each second connecting rope 36 is fixed, and the other end is connected to a second heddle rope 4.

[0040] Specifically, during the heald lifting process, when one end of the first connecting rope 35 is lifted by n heights (i.e., only one of the two first heald ropes 2 connected to the end of the first connecting rope 35), the first connecting rope 35 drives the first movable pulley 331 and the second movable pulley 332 to rise by n / 2 heights. At this time, the stroke of the second connecting rope 36 is n, and the multi-hedron wire 5 is lifted by n heights, achieving the first stroke. When the other first heald rope 2 connected to the end of the first connecting rope 35 is further lifted by n heights, the stroke of the second connecting rope 36 is n, and the multi-hedron wire 5 is lifted by n heights again, achieving the second stroke. That is, the lifting height of the multi-hedron wire 5 is twice that of the first movable pulley 331 and the second movable pulley 332. It is evident that when one of the two first heddle ropes 2 connected to the end of the first connecting rope 35 is raised by n heights, the multi-hedral wire 5 can be raised by n heights; when the other first heddle rope 2 connected to the end of the first connecting rope 35 is raised by another n heights, the multi-hedral wire 5 is raised a total of 2n heights. This achieves double stroke while increasing lifting efficiency and reducing energy consumption. n refers to the distance the multi-hedral wire 5 needs to rise during the weaving process.

[0041] like Figure 2As shown, the fixed pulley block 32 includes a first fixed pulley 321, a second fixed pulley 322, a third fixed pulley 323, and a fourth fixed pulley 324. The first and second fixed pulleys 321 and 322 are arranged vertically, as are the third and fourth fixed pulleys 323 and 324. The first and third fixed pulleys 321 and 323 are at the same height, and the second and fourth fixed pulleys 322 and 324 are also at the same height. The first connecting rope 35 passes sequentially through the first fixed pulley 321, the second fixed pulley 322, the first movable pulley 331, the third fixed pulley 323, and the fourth fixed pulley 324, and connects to the first heddle rope 2. Specifically, the first connecting rope 35 winds from the lower left of the first fixed pulley 321 to the upper right of the second fixed pulley 322, then passes through the first movable pulley 331, and then winds from the upper left of the third fixed pulley 323 to the lower right of the fourth fixed pulley 324, finally connecting with the first heddle rope 2. The first fixed pulley 321, the second fixed pulley 322, the third fixed pulley 323, and the fourth fixed pulley 324 provide guidance for the first heddle rope 2, keeping the two ends of the first heddle rope 2 extending out of the fixed shell 31 parallel and preventing entanglement with adjacent first heddle ropes 2.

[0042] The outer diameter of the first movable pulley 331 and the second movable pulley 332 is 7-9mm, preferably 8mm; the inner diameter is 4-6mm, preferably 5mm; and the total thickness is 4-6mm, preferably 5mm.

[0043] like Figure 2 As shown, the double-stroke heddle lifting assembly 3 also includes a fifth fixed pulley 37 disposed below the fixed housing 31. The fifth fixed pulley 37 and the fixed block 34 are respectively disposed on opposite sides of the fixed housing 31. The second connecting rope 36 passes sequentially through the fixed block 34, the second movable pulley 332, and the fifth fixed pulley 37, and connects to the second heddle rope 4. Specifically, one end of the second connecting rope 36 is fixed to the fixed block 34, and the other end passes through the second movable pulley 332, then winds around to one side of the fifth fixed pulley 37, is guided by the fifth fixed pulley 37, and is output. The presence of the fifth fixed pulley 37 ensures that all the output second connecting ropes 36 are parallel to each other, thereby ensuring that all the second heddle ropes 4 are parallel to each other and preventing them from tangling.

[0044] Both ends of the first connecting rope 35 that contact the first heddle rope 2 and the end of the second connecting rope 36 that contacts the second heddle rope 4 are provided with connecting blocks 38. The first connecting rope 35 is connected to the first heddle rope 2 through the connecting blocks 38, and the second connecting rope 36 is connected to the second heddle rope 4 through the connecting blocks 38.

[0045] The jacquard loom's double-stroke heddle-lifting device also includes a fixing frame 6 disposed outside the double-stroke heddle-lifting assembly 3. The fixing frame 6 is used to position the double-stroke heddle-lifting assembly 3. Specifically, as... Figure 3As shown, the fixing frame 6 includes a support frame 61 and an upper positioning plate 62 and a lower positioning plate 63 respectively disposed above and below the support frame. The upper positioning plate 62 and the lower positioning plate 63 are provided with a plurality of positioning holes 64. The first heddle rope 2 and the second heddle rope 4 pass through the positioning holes 64 on the upper positioning plate 62 and the lower positioning plate 63 respectively to realize the positioning of the double stroke lifting assembly 3 and prevent collisions or entanglements between different fixing shells 31, the first heddle rope 2 and the second heddle rope 4 during the lifting process.

[0046] When the upper positioning plate 62 has a×b positioning holes 64 on its surface, a×b / 2 first connecting ropes 35 can be installed, which can connect a×b / 2 double-stroke heald lifting units, and thus connect a×b / 2 multi-hedron wires 5. Here, a represents the number of rows and b represents the number of columns.

[0047] like Figure 5 As shown, in some embodiments, every four double-stroke lifting units form a group, called a double-stroke lifting unit group, in which case eight first heddle ropes 2 need to be set.

[0048] The height of the support frame 61 is adjustable, so that the distance between the upper positioning plate 62 and the lower positioning plate 63 is adjustable. The height of the support frame 61 can be adjusted by telescopic means or by fixing with different threaded holes. With this setting, the upper positioning plate 62 and the lower positioning plate 63 can be adjusted to a suitable distance according to the length of the heald rope, heald wire, and connecting rope.

[0049] The upper positioning plate 62 and the lower positioning plate 63 are made of one or more of nylon, polytetrafluoroethylene or bakelite.

[0050] The present invention also provides a method for using the above-mentioned double-stroke heddle-lifting device for a jacquard loom, comprising the following steps:

[0051] S1. Connect the first heddle rope 2 below the jacquard head 1 to the first connecting rope 35 in sequence; connect the second connecting rope 36 to one end of the second heddle rope 4; connect the other end of the second heddle rope 4 to the multi-eye heddle wire 5.

[0052] S2. Raise one end of the first connecting rope 35 by n heights, that is, only one of the two first heddle ropes 2 connected to the end of the first connecting rope 35 is raised. The first movable pulley 331 and the second movable pulley 332 both rise by n / 2 heights. The movement stroke of the second connecting rope 36 is n. The multi-eye heddle wire 5 is raised by n heights to achieve the first movement stroke.

[0053] S3. Raise the other end of the first connecting rope 35 by n heights, that is, raise another first heddle rope 2 (different from the one in step S1) connected to the end of the first connecting rope 35. The first movable pulley 331 and the second movable pulley 332 continue to rise by n / 2 heights. The movement stroke of the second connecting rope 36 is n. The multi-eye heddle wire 5 is raised by n heights again to achieve the second movement stroke.

[0054] That is, the multi-hedron yarn 5 has two movement strokes, "upper middle" and "middle lower", and can pause at three positions, "upper", "middle" and "lower", thereby forming multiple openings for the weft yarn to pass through, realizing the weaving of multi-layer fabrics.

[0055] The lifting height of the multi-eye heddle wire 5 is twice that of the first movable pulley 331 and the second movable pulley 332.

[0056] In summary, the double-stroke heddle lifting device and its usage method for jacquard looms provided by this invention achieve double-stroke lifting of the multi-heddle yarns by setting a double-stroke heddle lifting component between the jacquard loom head and the multi-heddle yarns. This component, through the cooperation of fixed pulleys, movable pulleys, and connecting ropes, achieves double-stroke lifting of the multi-heddle yarns. Simultaneously, the lifting height of the multi-heddle yarns is twice that of the first and second movable pulleys, resulting in higher lifting efficiency and lower energy consumption while achieving double-stroke lifting. This solves the problem that traditional jacquard loom heads cannot achieve double-stroke movement. By setting a double-stroke heddle lifting component between the jacquard loom head and the multi-heddle yarns, and utilizing this component to achieve multi-hed weaving, a new approach is provided for the preparation of multi-layer fabrics.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A double-stroke heddle-lifting device for a jacquard loom, characterized in that, The system includes, from top to bottom, a jacquard head, a first heald rope, a double-stroke heald assembly, a second heald rope, and multi-eye heald wires. The double-stroke heald assembly comprises several double-stroke heald units, each including a fixed housing and, from top to bottom, a fixed pulley group, a movable pulley group, and a fixed block within the fixed housing. The movable pulley group includes a first movable pulley and a second movable pulley connected vertically. A first connecting rope connects the first movable pulley and the fixed pulley group, with both ends of the first connecting rope connected to the first heald rope. A second connecting rope connects the second movable pulley and the fixed block, with one end of the second connecting rope connected to the fixed block and the other end connected to the second heald rope. The fixed pulley group includes a first fixed pulley, a second fixed pulley, a third fixed pulley, and a fourth fixed pulley; the first and second fixed pulleys are arranged vertically, as are the third and fourth fixed pulleys, with the first and third fixed pulleys at the same height, and the second and fourth fixed pulleys at the same height; the first connecting rope passes sequentially through the first fixed pulley, the second fixed pulley, the first movable pulley, the third fixed pulley, and the fourth fixed pulley, and is connected to the first heddle rope; The jacquard loom double-stroke heddle lifting device also includes a fixing frame disposed on the outside of the double-stroke heddle lifting assembly, the fixing frame being used to position the double-stroke heddle lifting assembly.

2. The double-stroke heddle-lifting device for a jacquard loom according to claim 1, characterized in that, The double-stroke lifting assembly also includes a fifth fixed pulley disposed below the fixed shell; the second connecting rope passes sequentially through the fixed block, the second moving pulley and the fifth fixed pulley, and is connected to the second heddle rope.

3. The double-stroke heddle-lifting device for a jacquard loom according to claim 1, characterized in that, The fixing frame includes a support frame and an upper positioning plate and a lower positioning plate respectively disposed above and below the support frame; both the upper positioning plate and the lower positioning plate are provided with a plurality of positioning holes, and the first heddle rope and the second heddle rope pass through the positioning holes on the upper positioning plate and the lower positioning plate respectively to realize the positioning of the double stroke lifting assembly.

4. The double-stroke heddle-lifting device for a jacquard loom according to claim 3, characterized in that, The height of the support frame is adjustable, so that the distance between the upper positioning plate and the lower positioning plate is adjustable.

5. The double-stroke heddle-lifting device for a jacquard loom according to claim 1, characterized in that, The outer diameter of the first movable pulley and the second movable pulley is 7-9mm, the inner diameter is 4-6mm, and the total thickness is 4-6mm.

6. The double-stroke heddle-lifting device for a jacquard loom according to claim 3, characterized in that, The upper positioning plate and the lower positioning plate are made of one or more of nylon, polytetrafluoroethylene or bakelite.

7. A method of using the double-stroke heddle-lifting device for a jacquard loom according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Connect the first heddle cord below the jacquard head to the first connecting cord in sequence; connect the two ends of the second heddle cord to the second connecting cord and the multi-eye heddle wire respectively; S2. Raise one end of the first connecting rope to a height of n, and both the first movable pulley and the second movable pulley rise to a height of n / 2. The movement stroke of the second connecting rope is n, and the multi-eye heddle wire is raised to a height of n to achieve the first movement stroke. S3. Raise the other end of the first connecting rope by n heights, and the first and second movable pulleys continue to rise by n / 2 heights. The movement stroke of the second connecting rope is n, and the multi-eye heddle wire is raised by n heights again to achieve the second movement stroke.

8. The method of using the double-stroke heddle-lifting device for a jacquard loom according to claim 7, characterized in that, The lifting height of the multi-eye heddle wire is twice that of the first movable pulley and the second movable pulley.

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