A high-density needle selection device based on a thin pulley block and an assembly thereof

Abstract

The present invention discloses a high-density needle selection device based on a thin pulley group and its components, including a substrate and a spacer. Two sets of thin pulley groups stacked front and back are provided inside the substrate, and two pairs of vertically arranged hooks with the same design corresponding thereto are also provided. Double electromagnets stacked up and down and two pairs of armature hooks with different designs corresponding thereto are further provided. The different designs of the armature hooks of the upper and lower electromagnets enable the vertically arranged hooks of the front and back surfaces of the substrate to have the same shape; the shaft hole part of the armature hook is rotationally connected to the substrate, and the rotating shaft is outside the closed magnetic circuit of the electromagnet, neither affecting the magnetic circuit nor being affected by the magnetic circuit. The overall structure of the present invention is compact, the magnetic circuit design is reasonable, the power consumption is small, and the operation is reliable; the adoption of the "king" shaped pulley frame structure enables the thin pulley group to work stably and increases the needle lifting density of the needle selection device, realizing a needle selection device capable of accommodating two sets of double-position repeat-action jacquard machines in one unit; the setting of the metal material heat sink has the function of electromagnetic shielding, improving the operation reliability of the high-density needle selection device.

Description

Technical Field

[0001] This invention belongs to the technical field of electronic jacquard machines in textile machinery, specifically relating to a high-density needle selection device and its components based on a thin pulley system. Background Technology

[0002] In recent years, electronic jacquard machines have made significant progress. A key component of an electronic jacquard machine is the needle selector (also called a solenoid valve, electromagnet, or assembly). The needle selector is the actuating component of the electronic jacquard machine, and its function is to convert electrical signals into the raising and lowering of warp yarns. The working principle of the needle selector is well-known technology, similar to that of an electromagnetic relay; it is a monostable device: when the coil is not energized, there is no electromagnetic force, and it does not attract the armature. Under the action of the return spring, the armature's magnetic poles move away from the iron core's magnetic poles, and it is in position 1 (stable position); when the coil is energized, it generates electromagnetic force, attracting the armature, and the armature's magnetic poles attract the iron core's magnetic poles, placing the armature in position 2 (metastable position).

[0003] In the needle selection device, the armature is made into a hook shape, called the armature hook. There is also a vertical hook that moves up and down with the jacquard loom's lifting cutter. When the vertical hook disengages from the armature hook, it is called the "disengaged" state, and the vertical hook moves with the lifting cutter. When the vertical hook hooks onto the armature hook, it is called the "hooked" state, and the vertical hook detaches from the lifting cutter and does not move with it. Typically, position 1 (steady-state position) is the "hooked" state, and position 2 (temporarily stable position) is the "disengaged" state, or vice versa. Since the vertical hook connects the guide warp and heddle wires to control the warp yarns, the rise and fall of the vertical hook corresponds to the rise and fall of the warp yarns.

[0004] Jacquard looms are divided into single-action and double-action types. The double-action type has a more complex mechanism; one jacquard needle corresponds to two vertical hooks, and the two hooks are converted into the movement of one jacquard needle via a pulley system. The double-action type causes less damage to the warp yarns, which is beneficial for weaving. Currently, most electronic jacquard looms are double-action. Mass-produced commercially available needle selection devices often integrate eight electromagnets and their corresponding mechanisms into a single unit for easy installation and maintenance.

[0005] The complex needle selection mechanism, with its numerous components, necessitates a significant space allocation for its implementation. Within the electronic jacquard machine, these needle selection devices are densely arranged in a matrix to form needle boxes, and several needle boxes constitute the entire machine. The volume of the needle selection device directly impacts the overall volume of the electronic jacquard machine, influencing the length of the lifting blade and the design of the mechanism driving its movement. This application proposes a concept of needle density, defined as the number of needles per unit area (the area being the projected area of ​​a surface orthogonal to the needles). Therefore, the needle density of the needle selection device is the ratio of the number of needles to its projected area; similarly, the needle density of the jacquard machine is the ratio of the number of needles to its projected area. Clearly, for the same number of needles, a jacquard machine with higher needle density will have a smaller overall volume.

[0006] Currently, one of the more commonly used needle selection devices on the market has a needle density of 8 needles corresponding to 4×3.5cm. 2 With a needle selection device of approximately 5714 needles per square meter, or 0.57 needles per square centimeter, a jacquard loom with a 5120-needle head would have a projected area of ​​nearly 1 square meter, while a 10,000-needle head would require 2 square meters. Larger needle count heads are mechanically very difficult to manufacture. Such a massive machine also presents significant challenges in its integration with the loom. This is a bottleneck limiting the development of high-needle-count jacquard looms. If a high-density needle selection device were available, for example, doubling the needle density of the selection device, then manufacturing 10,000-needle or even more than 10,000-needle heads would be feasible.

[0007] Chinese invention patent application "Yarn Selection Device, Double Shed Weaving System and Loom Equipped with This Weaving System", patent number 98116491.9 (hereinafter referred to as Prior Patent 1), and European patent application "Three-Position Opening Jacquard Machine", application number: 0723041 (hereinafter referred to as Prior Patent 2), both utilize a scheme of two electromagnets stacked vertically. Prior Patent 2 requires the jacquard machine to have two sets of lifting blades, and suffers from the problems of large electromagnet size and high power consumption, making it less compact. Prior Patent 1, on the other hand, proposes a scheme using two electromagnets to control a "hook pair," where the "hook" corresponds to the "vertical hook" in the needle selection device, and the "hook pair" is a pair of two related hooks. Prior Patent 1's scheme cannot directly generate a three-position opening; it requires the action of a complex pulley system connected to the "hook pair" to generate the three-position opening. Since the "pull hook pair" consists of two pull hooks moving in conjunction with each other, unlike two independent vertical hooks, the solution in prior patent 1 cannot replace two independent vertical hooks to improve the needle lifting density of the two-position needle selection device, nor can it lead to a high-density solution. Summary of the Invention

[0008] To overcome the shortcomings of the existing technology, the present invention provides a high-density needle selection device and its components based on a thin pulley system.

[0009] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution:

[0010] A high-density needle selection device based on a thin pulley system includes a substrate and a partition plate. The partition plate covers the front or rear side of the substrate. Both the front and rear sides of the substrate have pulley system grooves in the middle and vertical hook guides on the left and right sides. A pair of identical vertical hooks are respectively installed in the vertical hook guides on the front and rear sides of the substrate. A set of identical thin pulley systems is respectively installed in the pulley system grooves on the front and rear sides of the substrate. The two pairs of vertical hooks drive their respective sets of thin pulley systems to slide up and down through an upper pulley line.

[0011] The top of the substrate has two electromagnets stacked vertically, each with two intersecting magnetic pole surfaces. On the left and right sides of each electromagnet are a pair of armature hooks that engage with a pair of vertical hooks on the same side. These two pairs of armature hooks have different designs and are located inside the pair of vertical hooks on the same side. The shaft holes of the two pairs of armature hooks are rotatably connected to the front and rear surfaces of the substrate via a pair of rotating shafts on the substrate. The rear sides of the hook tips of the two pairs of armature hooks are elastically connected to the left and right sides of the electromagnet frame via a pair of springs. The intersecting magnetic pole surfaces of the two electromagnets engage with the two sides of their respective pair of armature hooks to form closed magnetic circuits. The two pairs of rotating shafts are located outside the two closed magnetic circuits, and the hook tips and magnetic poles of the armature hooks are on the same side of the rotating shafts. If the length of the armature hook on the same side is less than that of the pivot between the hook tip and the magnetic pole, the armature hook will be lighter and the overall size of the electromagnet will be smaller and more compact.

[0012] Furthermore, the structures on the front and rear surfaces of the substrate are respectively surface A and surface B, and the pulley group groove and the vertical hook guide rail located on the front side of the substrate are respectively surface A pulley group groove and surface A vertical hook guide rail, and the pulley group groove and the vertical hook guide rail located on the rear side of the substrate are respectively surface B pulley group groove and surface B vertical hook guide rail; the two pairs of vertical hooks are respectively a pair of first vertical hooks and a pair of second vertical hooks with the same structure; the two thin pulley groups are respectively a first thin pulley group and a second thin pulley group with the same structure; the two electromagnets stacked vertically are respectively an upper electromagnet and a lower electromagnet with symmetrical structure; the two pairs of armature hooks are respectively a lower armature hook and an upper armature hook with different structures; the two pairs of springs are respectively a pair of first springs and a pair of second springs with the same structure; the two pairs of rotating shafts are respectively a first rotating shaft and a second rotating shaft with the same structure;

[0013] The specific structure on surface A is as follows: a pair of first vertical hooks are slidably mounted on the left and right sides of the vertical hook guide rails on surface A; a first thin pulley group is slidably mounted on the pulley group grooves on surface A; the pair of first vertical hooks are connected to the two ends of the upper pulley line of the first thin pulley group; the two ends of the lower pulley line of the first thin pulley group are fixed and connected to the first lead wire connector; the first vertical hooks move up and down with the lifting of the knife within the vertical hook guide rails on both sides of surface A, driving the first thin pulley group to move up and down within the pulley group grooves on surface A; the lower electromagnet is fixedly mounted on the lower end of the electromagnet frame; a pair of lower armature hooks are located on the left and right sides of the lower electromagnet, and the pair of lower armature hooks are located inside the pair of first vertical hooks; the shaft holes of the pair of lower armature hooks are connected to the corresponding front side of the substrate via a pair of first rotating shafts. The two lower armature hooks are connected by a rotating point. The rear sides of the hook tips of the two lower armature hooks are elastically connected to corresponding points on the left and right sides of the lower part of the electromagnet frame through a pair of first springs. The intersecting magnetic pole surfaces of the lower electromagnet cooperate with the two sides of the two lower armature hooks to form two corresponding closed magnetic circuits. Both first rotating shafts are located outside the closed magnetic circuits of surface A, and the hook tips and magnetic poles of the lower armature hooks are on the same side of the first rotating shafts. When the lower electromagnet is energized, the lower armature hooks are held in the closed magnetic circuit position, and the hook tips of the lower armature hooks do not contact the hook tips of the first vertical hooks, thus being in a disengaged state. When the lower electromagnet is not energized, the lower armature hooks move away from the magnetic poles of the lower electromagnet under the action of the first springs, and the hook tips of the lower armature hooks hook the hook tips of the first vertical hooks in a lifting manner, thus being in a hooked state.

[0014] The specific structure on the B surface is as follows: A pair of the second vertical hooks are respectively arranged in the B surface vertical hook guide rails on the left and right sides in a slidable up-and-down manner. The second thin pulley group is arranged in the B surface pulley group chute in a slidable up-and-down manner. A pair of the second vertical hooks are connected to the upper pulley wires of the second thin pulley group. The two ends of the lower pulley wires of the second thin pulley group are respectively fixed and connected to the second head wire joint. The second vertical hooks in the B surface vertical hook guide rails on both sides drive the second thin pulley group to rise and fall in the B surface pulley group chute as the knife lifter rises and falls. The upper electromagnet is fixedly installed at the upper end of the electromagnet skeleton. A pair of the upper armature hooks are respectively located on the left and right sides of the upper electromagnet, and a pair of the upper armature hooks are located inside a pair of the second vertical hooks. The shaft hole parts of a pair of the upper armature hooks are rotationally connected to the corresponding points on the rear side of the substrate through a corresponding pair of the second rotating shafts. The rear sides of the hook tip parts of a pair of the upper armature hooks are respectively elastically connected to the corresponding points on the left and right sides of the upper part of the electromagnet skeleton through a pair of the second springs. The intersecting magnetic pole surfaces of the upper electromagnet respectively cooperate with the two sides of a pair of the upper armature hooks to form two corresponding surface closed magnetic circuits. And both of the second rotating shafts are located outside the B surface closed magnetic circuit, and the hook tip parts and the magnetic pole parts of the upper armature hooks are on the same side of the second rotating shaft. When the upper electromagnet is powered on, the upper armature hooks are kept in the surface closed magnetic circuit position, and the hook tips of the upper armature hooks do not contact the hook tips of the second vertical hooks, presenting a decoupled state. When the upper electromagnet is not powered on, the upper armature hooks move away from the magnetic poles of the upper electromagnet under the action of the second springs, and the hook tips of the upper armature hooks hook the hook tips of the second vertical hooks in a pulling manner, presenting a hooked state.

[0015] Further, the thin pulley group includes two vertical plates, two upper cross plates, two middle cross plates, two lower cross plates and two thin pulleys. After the two upper cross plates are joined face to face, an upper layer fixing plate is formed. After the two middle cross plates are joined face to face, a middle layer fixing plate is formed. After the two lower cross plates are joined face to face, a lower layer fixing plate is formed. The upper layer fixing plate, the middle layer fixing plate and the lower layer fixing plate form a "king" - shaped bracket under the front and rear clamping of the two vertical plates. There is a pulley installation gap between the two vertical plates under the support of the upper layer fixing plate, the middle layer fixing plate and the lower layer fixing plate. The pulley installation gap forms an upper pulley installation gap position and a lower pulley installation gap position in the area between the upper layer fixing plate and the middle layer fixing plate and in the area between the middle layer fixing plate and the lower layer fixing plate respectively. The two thin pulleys are respectively rotatably installed in the upper pulley installation gap position and the lower pulley installation gap position through corresponding sliding bearing assemblies.

[0016] The width of the vertical plate is smaller than the diameter of the thin pulley, and a buffer and shock absorption structure is provided in the middle of the vertical plate by means of a slot; the width of the middle horizontal plate is slightly larger than the diameter of the thin pulley, and the thickness of the left and right ends of the middle horizontal plate is the same, so as to serve as a positioning slider when the thin pulley group moves in the pulley group groove; the width of the upper horizontal plate and the lower horizontal plate are equal, and the width of the upper horizontal plate and the lower horizontal plate is smaller than the width of the middle horizontal plate and larger than the width of the vertical plate.

[0017] Furthermore, the sliding bearing assembly includes a journal and a bushing. The journal is disposed on the axis of the thin pulley, and the bushing is disposed on the vertical plates on the front and rear sides respectively. The journal and the bushing are made of metal materials with similar hardness, wherein the hardness ratio of the bushing is greater than that of the journal. An oil reservoir is provided on the journal, and a sealing cap for covering the oil reservoir is provided on the outer periphery of the bushing.

[0018] Furthermore, the vertical hook includes a rod-shaped body. A side ear for engaging with the blade edge is provided at the middle of the outer side of the rod-shaped body. A top hook is provided at the top of the inner side of the rod-shaped body, with the hook tip close to the inner edge of the rod-shaped body and the hook base close to the axis of the rod-shaped body. A protruding edge is provided at the upper edge of the inner side of the rod-shaped body, below the top hook, for laterally pushing and holding the corresponding armature hook. The protruding edge laterally protrudes beyond the hook tip of the top hook. The contour curve of the protruding edge is divided into a pushing section in the upper part and a holding section in the lower part. The shifting section is an inclined curve starting from the bottom of the top hook, and the holding section is a straight line parallel to the moving direction of the rod-shaped body. The shifting section and the holding section are smoothly connected. The distance from the bottom of the holding section to the bottom of the top hook is greater than the distance from the tip of the top hook to the bottom of the top hook. The length of the holding section of the convex edge corresponds to the tolerance range of the jacquard machine knife lifting height allowed by its needle selection device. The middle and lower parts of the inner side of the rod-shaped body are provided with a limiting convex edge along its edge for engaging with the vertical hook guide rail and ensuring that the vertical hook does not have lateral displacement. The top end of the limiting convex edge is connected to the bottom end of the holding section of the convex edge in a straight line.

[0019] Furthermore, at least one damping groove is provided between the side ear and the rod-shaped body to block the vibration of the lifting knife.

[0020] Furthermore, the armature hook includes a straight rod portion, a magnetic pole surface sliding contact portion, a magnetic pole surface attracting contact portion, a shaft hole portion, a hook tip portion, and a spring positioning post. The cross-section of the straight rod portion is rectangular. The shaft hole portion is disposed at one end of the straight rod portion through the magnetic pole surface sliding contact portion. The hook tip portion is disposed at the other end of the straight rod portion through the magnetic pole surface attracting contact portion. The spring positioning post is disposed on the side wall of the straight rod portion facing the electromagnet.

[0021] The electromagnet is formed by winding enameled wire around an I-shaped iron core. One end of the I-shaped iron core is a long magnetic pole, and the other end is a short magnetic pole. The long magnetic pole has a first bend that curves backward at both ends, and the short magnetic pole has a second bend that curves forward at both ends. The first bend and the second bend are offset from each other, and the offset is equal to the thickness of the straight rod. The concave surface of the first bend serves as a sliding magnetic pole surface, and the side surface of the second bend serves as an attracting magnetic pole surface. The sliding magnetic pole surface and the attracting magnetic pole surface on the same side form two intersecting magnetic pole surfaces. A magnetically conductive plastic cover is provided in front of the sliding magnetic pole surface. There is a gap between the magnetically conductive plastic cover and the sliding magnetic pole surface to form a groove for easy insertion of the straight rod. A magnetically conductive elastic element for contacting the straight rod is provided in the groove.

[0022] After assembly, the shaft hole is rotatably mounted on the rotating shaft, one end of the spring is fixed to the spring positioning post, and the other end of the spring is fixedly connected to a corresponding point on the side wall of the electromagnet frame; the magnetic pole surface sliding contact is tightly embedded in the groove formed by the sliding magnetic pole surface, the magnetically conductive plastic cover, and the magnetically conductive elastic element, and the magnetic pole surface attraction contact is laterally aligned with the attraction magnetic pole surface; when the magnetic pole surface attraction contact is in contact with the attraction magnetic pole surface, three sides of the magnetic pole surface sliding contact are in contact with the sliding magnetic pole surface, the magnetically conductive plastic cover, and the magnetically conductive elastic element, respectively, so that the sliding magnetic pole surface, the magnetic pole surface sliding contact, the straight rod, the magnetic pole surface attraction contact, and the attraction magnetic pole surface constitute the closed magnetic circuit; the shaft hole is located outside the closed magnetic circuit and does not participate in the magnetic conduction path of the closed magnetic circuit; the mating points of the two pairs of armature hooks and their respective corresponding pairs of vertical hooks are at the same position and height.

[0023] Furthermore, a printed circuit board slot is provided at the top of the electromagnet frame, and metal springs for connecting the coil leads of the electromagnet are provided on both sides of the printed circuit board slot. Coil lead grooves, first spring mounting holes and second spring mounting holes are provided on both the left and right sides of the electromagnet frame.

[0024] Furthermore, a heat sink for dissipating heat from the coil of the electromagnet and having an electromagnetic shielding effect is provided at the top of the spacer. The heat sink is made of a non-magnetic metal material, and at least one surface of the heat sink is exposed to make good contact with the metal body for heat conduction and electricity conduction to the outside.

[0025] A high-density needle selection device assembly is a 16-needle high-density needle selection device assembly formed by stacking 8 of the above-mentioned high-density needle selection devices based on a thin pulley group.

[0026] It should be noted that the technical solution of the present invention is not limited to manufacturing a 16-needle high-density needle selection device assembly, and higher-density needle selection device assemblies can also be manufactured.

[0027] The present invention also discloses an electronic jacquard machine equipped with the high-density needle selection device assembly as disclosed above.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The present invention optimizes and improves the pulley group. Firstly, the "king" - shaped frame design is adopted, which can strengthen the structural stability of the bracket of the pulley group when the vertical plate is thinned. The shaft part for carrying the pulley changes from the end force of a single - end - fixed cantilever beam to the middle force of a double - end - fixed structure, thus solving the "support" problem under the force of the pulley shaft and the manufacturing problem of the ultra - thin pulley group. Secondly, the metal sliding bearing solution is adopted. Compared with the ultra - thin ball bearing which is difficult to manufacture and has a high cost, the metal sliding bearing is more suitable for the ultra - thin pulley group and has a lower cost. Then, an elastic part for shock absorption is designed in the middle of the vertical plate, which can buffer the vibration and impact during the operation of the mechanism and extend the working life of the pulley group. Therefore, the thin pulley group in the present invention can fully achieve the design goal of reducing the thickness to 2 - 2.4 mm, opening up a larger design space for high - density needle selectors and even high - density jacquard machines.

[0030] This invention optimizes and improves hook release technology by employing a fully linear vertical hook guide rail and a vertical hook convex edge design to create a new hook release technology. This technology allows for the design of larger hooks without concerns about difficulty in releasing them, and the ample design margin ensures operational reliability under complex working conditions. The cooperation between the fully linear vertical hook guide rail and the vertical hook convex edge ensures the accuracy of the lateral displacement of the convex edge relative to the armature hook during vertical hook movement, enabling a dynamic magnetic gap range of 0–0.3 mm. Furthermore, the distance from the holding section of the vertical hook convex edge to the hook bottom is greater than the distance from the hook tip to the hook bottom; this distance difference is also the distance from the armature hook tip to the vertical hook tip, thus providing a release margin, which is a tolerance margin that prevents malfunctions and improves reliability. The holding section of the convex edge allows the knife to reach the vertical hook switching height (from hooking to releasing) required by the needle selection device within a wide range, providing a wide range of knife lifting height tolerance (tolerance margin), reducing the manufacturing difficulty of the jacquard machine main unit and improving the overall machine's operational reliability. The vertical hook has one or more shock-absorbing grooves between the side ear and the rod to prevent the vibration of lifting the knife from being transmitted to the hook tip through the side ear, which can also improve the reliability of the action.

[0031] This invention optimizes and improves the magnetic circuit structure. The electromagnet of this invention eliminates the large magnetic reluctance caused by the "shaft magnetic gap" in existing technologies, thus improving electromagnet efficiency. The electromagnet of this invention has fewer factors affecting the circuit magnetic reluctance, facilitating quality control in mass production. The shaft of the electromagnet of this invention is not on a closed magnetic circuit; the shaft's movement resistance is independent of the electromagnetic force, and the shaft does not bear the heavy responsibility of controlling the magnetic gap accuracy, allowing for a more flexible design and improved shaft flexibility. The armature hook of the electromagnet of this invention is shorter and lighter, resulting in a more compact overall structure for the needle selection device using this electromagnet. The armature of the electromagnet of this invention contacts the side of the I-beam core beam, and under the action of electromagnetic force, the armature and the magnetic poles of the I-beam core can automatically align. The electromagnet coil of this invention has low power consumption, reducing the load on the drive circuit. Furthermore, the coil temperature is low, reducing mechanical deformation of the needle selection device components due to temperature rise. It also improves the tolerance margin to power supply voltage and ambient temperature, enhancing the reliability of operation and control.

[0032] The heat sink of this invention is made of non-magnetic metal material, such as copper or aluminum sheet. This heat sink can not only dissipate heat from the dual electromagnet coils and conduct heat, but also has an electromagnetic shielding function. While conducting heat, it can provide both magnetic and electrical shielding, playing a role in resisting electromagnetic interference and further improving the working reliability of the high-density needle selection device.

[0033] The high-density needle selection device of this invention features a compact overall structure, a rationally designed magnetic circuit, a small electromagnet size, low power consumption, and reliable operation. Furthermore, it employs two independent vertical hooks to enhance the needle lifting density of the two-position needle selection device, thus enabling the integration of two sets of needle selection devices for dual-position compound jacquard machines into a single unit. Using this high-density needle selection device, a 16-needle selection device assembly can be implemented, corresponding to a 4×3.5cm... 2 The needle density is as high as 11,428 needles per square meter, which is twice that of commonly used needle selection device components on the market. Therefore, the high-density needle selection device of this invention is expected to be used to manufacture electronic jacquard machines with 20,000 needles or even more needles per machine.

[0034] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0036] Figure 1 This is an exploded view of the high-density needle selection device of the present invention;

[0037] Figure 2 This is a schematic diagram of the mounting of the substrate A side of the high-density needle selection device of the present invention;

[0038] Figure 3 This is a schematic diagram of the mounting of the substrate B side of the high-density needle selection device of the present invention;

[0039] Figure 4 This is a schematic diagram of the thin pulley block in the high-density needle selection device of the present invention;

[0040] Figure 5 This is an exploded view of the thin pulley block in the high-density needle selection device of the present invention;

[0041] Figure 6 This is a structural diagram of a vertical hook embodiment in the high-density needle selection device of the present invention;

[0042] Figure 7 This is a structural diagram of another vertical hook embodiment in the high-density needle selection device of the present invention;

[0043] Figure 8 This is a schematic diagram of the structure of the I-beam core and armature hook of the high-density needle selection device of the present invention when they form a closed magnetic circuit;

[0044] Figure 9 This is a schematic diagram of the structure of the high-density needle selection device of the present invention after the dual electromagnets and the electromagnet frame are assembled.

[0045] Figure 10 This is a schematic diagram of the septum structure in the high-density needle selection device of the present invention;

[0046] Figure 11 This is a schematic diagram of the high-density needle selection device assembly of the present invention;

[0047] Figure 12 This is a schematic diagram of the substrate for Staubli's M4 / M5 modules. Detailed Implementation

[0048] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The description herein is intended to provide a further understanding of the invention and forms part of this application. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0049] See Figure 1 As shown, a high-density needle selection device based on a thin pulley system includes a substrate 1. A partition 2 is provided on the front or rear side of the substrate 1. Both the front and rear sides of the substrate 1 are provided with a set of A-side action structure and B-side action structure composed of components such as a vertical hook guide rail, a pulley system groove, a vertical hook, a thin pulley system, an electromagnet, and an armature hook.

[0050] See Figure 1 and Figure 2As shown, in the A-side action structure, the A-side of the substrate 1 has an A-side pulley group groove located at the center line of the A-side and A-side vertical hook guide rails located on the left and right sides of the A-side and linearly connected throughout. A first vertical hook 6a, which can slide up and down, is respectively installed in the vertical hook guide rails on the left and right sides. A first thin pulley group 7a, which can slide up and down, is installed in the A-side pulley group groove. The lower ends of the two first vertical hooks 6a are respectively connected to the two ends of the upper pulley line wound around the upper pulley of the first thin pulley group 7a, and one end of the lower pulley line wound around the lower pulley of the first thin pulley group 7a is connected to the first head line connector 16a, while the other end is fixed. The first vertical hooks 6a move up and down within the vertical hook guide rails on both sides of the A-side as the knife is lifted, causing the first thin pulley group 7a to move up and down within the pulley group groove on the A-side. The substrate 1 has a common electromagnet frame 9 at its top, and a lower electromagnet 3a at its lower end. The lower electromagnet 3a has two intersecting magnetic pole surfaces on its left and right sides. Two lower armature hooks 4a are respectively provided on the left and right sides of the lower electromagnet 3a to limit the movement of the first vertical hook 6a, and the two lower armature hooks 4a are located inside the two first vertical hooks 6a. The shaft holes of the two lower armature hooks 4a are rotatably connected to corresponding points on the front side of the substrate 1 via a corresponding first rotating shaft 8a. The rear sides of the hook tips of the two lower armature hooks 4a are elastically connected to corresponding points on the left and right sides of the lower part of the electromagnet frame 9 via a corresponding first spring 5a. The two intersecting magnetic pole surfaces of the lower electromagnet 3a can contact and cooperate with the two sides of the lower armature hooks 4a to form a closed magnetic circuit on surface A. The two first rotating shafts 8a are located outside the closed magnetic circuit on surface A, so they neither affect nor are affected by the magnetic circuit. The hook tips and magnetic poles of the lower armature hooks 4a are on the same side of the first rotating shaft 8a. When the lower electromagnet 3a is energized, the lower armature hook 4a remains in the closed magnetic circuit position on surface A, and the hook tip of the lower armature hook 4a does not contact the hook tip of the first vertical hook 6a, thus being in a disengaged state; when the lower electromagnet 3a is not energized, the lower armature hook 4a moves away from the magnetic pole of the lower electromagnet 3a under the action of the first spring 5a, and the hook tip of the lower armature hook 4a hooks the hook tip of the first vertical hook 6a in a lifting manner, thus being in a hooked state.

[0051] See Figure 1 and Figure 3As shown, in the B-side action structure, the B-side of the substrate 1 has a B-side pulley group groove located at the center line of the B-side and B-side vertical hook guide rails located on the left and right sides of the B-side and linearly connected throughout. A second vertical hook 6b, which can slide up and down, is respectively installed in the vertical hook guide rails on the left and right sides. A second thin pulley group 7b, which can slide up and down, is installed in the B-side pulley group groove. The lower ends of the two second vertical hooks 6b are respectively connected to the two ends of the upper pulley line wound around the upper pulley of the second thin pulley group 7b, and one end of the lower pulley line wound around the lower pulley of the second thin pulley group 7b is connected to the second head line connector 16b, while the other end is fixed. The second vertical hooks 6b move up and down within the vertical hook guide rails on both sides of the B-side as the knife is lifted, driving the second thin pulley group 7b to move up and down within the pulley group groove on the B-side. An upper electromagnet 3b is installed at the upper end of the electromagnet frame 9, and the upper electromagnet 3b has two intersecting magnetic pole surfaces on both its left and right sides. Two upper armature hooks 4b are respectively provided on the left and right sides of the upper electromagnet 3b to limit the second vertical hook 6b, and the two upper armature hooks 4b are located inside the two second vertical hooks 6b. The shaft holes of the two upper armature hooks 4b are rotatably connected to corresponding points on the rear side of the substrate 1 through corresponding second rotating shafts 8b. The rear sides of the hook tips of the two upper armature hooks 4b are elastically connected to corresponding points on the left and right sides of the upper part of the electromagnet frame 9 through corresponding second springs 5b. The two intersecting magnetic pole surfaces of the upper electromagnet 3b can contact and cooperate with the two sides of the upper armature hooks 4b to form a closed magnetic circuit of surface B. The two second rotating shafts 8b are located outside the closed magnetic circuit of surface B, neither affecting nor being affected by the magnetic circuit. The hook tips and magnetic poles of the upper armature hooks 4b are on the same side of the second rotating shaft 8a. When the upper electromagnet 3b is energized, the upper armature hook 4b remains in the closed magnetic circuit position on surface B, and the hook tip of the upper armature hook 4b does not contact the hook tip of the second vertical hook 6b, thus being in a disengaged state; when the upper electromagnet 3b is not energized, the upper armature hook 4b moves away from the magnetic pole of the upper electromagnet 3b under the action of the second spring 5b, and the hook tip of the upper armature hook 4b hooks the hook tip of the second vertical hook 6b in a pulling manner, thus being in a hooked state.

[0052] from Figures 1-3As can be seen, the structures of a pair of first vertical hooks 6a and a pair of second vertical hooks 6b adopt the same design, the structures of the first thin pulley set 7a and the second thin pulley set 7b adopt the same design, the structures of the upper electromagnet 3b and the lower electromagnet 3a pair adopt an up-and-down symmetric design, the structures of the lower armature hook 4a and the upper armature hook 4b adopt different hook designs, the structures of a pair of first springs 5a and a pair of second springs 5b adopt the same design, and the structures of the first rotating shaft 8a and the second rotating shaft 8b adopt the same design. It is precisely because of the up-and-down symmetric design of the upper electromagnet 3b and the lower electromagnet 3a, as well as the different hook designs of the lower armature hook 4a and the upper armature hook 4b, that the A-side action structure and the B-side action structure can adopt two pairs of vertical hooks with the same shape, namely a pair of first vertical hooks 6a and a pair of second vertical hooks 6b.

[0053] The present invention first improves and optimizes the pulley sets of the existing needle selection device:

[0054] See Figure 4 and Figure 5 As shown in and, the first thin pulley set 7a and the second thin pulley set 7b adopted by the present invention have the same structure, and both include two vertical plates 701, two upper cross plates 702, two middle cross plates 703, two lower cross plates 704 and two thin pulleys 705. The vertical plates 701, the upper cross plates 702, the middle cross plates 703 and the lower cross plates 704 are all formed by plastic materials, or the vertical plates 701 are made of metal materials, and the upper cross plates 702, the middle cross plates 703 and the lower cross plates 704 are made of plastic materials and are injection-molded with the vertical plates 701. The combination of metal parts and injection-molded parts is adopted, which is convenient for mass production and quality control.

[0055] Among them, after the two upper cross plates 702 are joined together face to face, an upper layer fixing plate is formed, after the two middle cross plates 703 are joined together face to face, a middle layer fixing plate is formed, and after the two lower cross plates 704 are joined together face to face, a lower layer fixing plate is formed; the upper layer fixing plate, the middle layer fixing plate and the lower layer fixing plate form a "king" - shaped bracket under the front and rear clamping of the two vertical plates 701. This "king" - shaped bracket has three mechanical support points, so that the stress condition at the shaft end can be effectively improved. At the same time, a buffer and shock absorption structure 706 is arranged in the middle of the vertical plate 701 by means of grooving, so as to buffer the vibration and impact during the operation of the mechanism and extend the working life of the thin pulley set.

[0056] Both the front and rear vertical plates 701 are provided with mounting holes, and all the upper horizontal plates 702, the middle horizontal plates 703, and the lower horizontal plates 704 are provided with mounting blocks. The upper horizontal plates 702, the middle horizontal plates 703, and the lower horizontal plates 704 are respectively fixedly installed on the vertical plates 701 on the same side by the cooperation of their respective mounting blocks 711 and the corresponding mounting holes 712. The two middle horizontal plates 703 are divided into a male plate and a female plate. The male plate is provided with a pressing block 709, and the female plate is provided with a pressing hole 710. The male plate and the female plate are pressed and fixed by the cooperation of the pressing block 709 and the pressing hole 710.

[0057] A pulley installation gap exists between the two vertical plates 701, supported by the upper, middle, and lower fixing plates. This pulley installation gap forms an upper pulley installation gap position in the area between the upper and middle fixing plates, and a lower pulley installation gap position in the area between the middle and lower fixing plates, respectively. Two thin pulleys 705 are rotatably mounted at the upper and lower pulley installation gap positions via corresponding sliding bearing assemblies. The pulley installation gap must be slightly larger than the thickness of the thin pulley 705 to allow for its rotation.

[0058] The width of the vertical plate 701 is smaller than the diameter of the thin pulley 705, and the width of the middle horizontal plate 703 is slightly larger than the diameter of the thin pulley 705. The thickness of the left and right ends of the middle horizontal plate 703 is the same, serving as a positioning slider 707 for the thin pulley assembly when it moves within the pulley assembly groove. The widths of the upper horizontal plate 702 and the lower horizontal plate 704 are equal. The widths of both the upper horizontal plate 702 and the lower horizontal plate 704 are smaller than the width of the middle horizontal plate 703 and larger than the width of the vertical plate 701.

[0059] The sliding bearing assembly includes a journal 713 and a bushing 714. The journal 713 is disposed on the axis of the thin pulley 705, and the bushing 714 is disposed on the vertical plates 701 on the front and rear sides respectively. An oil reservoir 715 is formed on the journal 713, and a sealing cap 708 for covering the oil reservoir is provided on the outer periphery of the bushing 714. The journal 713 and the bushing 714 are made of metal materials with similar hardness, wherein the hardness ratio of the bushing 714 is greater than that of the journal 713. This metal sliding bearing design is more suitable for ultra-thin pulley systems and is also less expensive.

[0060] from Figure 1As can be clearly seen, during installation, the two sets of thin pulley sets can be stacked one after the other in the first high-density needle selection device unit. The two sets of thin pulley sets can be slidably installed in the pulley set groove on the A side or the pulley set groove on the B side through their respective positioning sliders 707.

[0061] It should be emphasized that the thickness of the thin pulley block of the present invention is only half that of the existing pulley blocks. Therefore, considering material strength, the thin pulley block of the present invention should use high-strength, wear-resistant materials. Because the pulley groove is narrower, the pulley guide rope used must also be thinner, with a thickness adapted to the pulley groove.

[0062] By adopting the above-mentioned thin pulley block design, the structural stability of the support frame can be strengthened even when the vertical plate of the pulley block is thinned. The force on the end of the cantilever beam, which is fixed at one end, is changed to the force on the middle part, which is fixed at both ends. This solves the "support" problem under the stress of the pulley shaft and solves the manufacturing problem of ultra-thin pulley blocks.

[0063] This invention also improves and optimizes the hook-and-unhooking technology of existing needle selection devices:

[0064] See Figure 12 As shown, taking the Staubli M4 / M5 module, which is widely used in the market, as an example, it has the following disadvantages:

[0065] 1. The M4 / M5 assembly lacks a fully linear guide rail for vertical hook lifting; the upper part of the guide rail is intentionally bent. From Figure 12 The C-shaped section indicates the guide groove of the M4 / M5 assembly that restricts the movement of the vertical hook. The curved design at the top of the guide groove causes the vertical hook to tilt when it reaches this point, forming a disengaged posture.

[0066] 2. The M4 / M5 assembly does not have a fixed-height flange; instead, it uses a molded elastic component. Therefore, if this elastic component is compressed for an extended period during operation (e.g., when the blade is fully extended), it will undergo plastic deformation, lose its elasticity, and cease functioning.

[0067] 3. The M4 / M5 assembly does not have a retaining section for the raised edge, resulting in poor "tool lifting tolerance" performance;

[0068] 4. The M4 / M5 assembly does not have a fixed "unhooking allowance". Due to the curved guide rail, the vertical hook is not vertical in the high position and is tilted. Furthermore, due to the presence of the elastic element, the distance between the tip of the vertical hook and the tip of the armature hook is uncertain.

[0069] 5. The M4 / M5 assembly does not have a "dynamic magnetic gap" design. In fact, its working principle is to move directly from the static magnetic gap to the closed magnetic gap. Its curved guide rail design and elastic element design are intended to press the armature hook as close as possible to the electromagnet pole. However, in operation, factors such as vibration will cause uncertainty.

[0070] See Figures 1-3 As shown, this invention first designs fully linear first vertical hook guide rails on both sides of surface A of substrate 1, and fully linear second vertical hook guide rails on both sides of surface B of substrate 1. Secondly, this invention improves and optimizes the structure of the first vertical hook 6a and the second vertical hook 6b.

[0071] See Figure 6 and Figure 7 As shown, the first vertical hook 6a and the second vertical hook 6b of the present invention have the same structure, both including a rod-shaped body 601. The middle part of the outer side of the rod-shaped body 601 is provided with a side ear 602 for hooking with the blade of the lifting knife. When working, the side ear 602 is directly hooked on the blade of the lifting knife. The lifting knife pulls the vertical hook through the side ear 602. The top end of the inner side of the rod-shaped body 601 is provided with a top hook 603, and the hook tip of the top hook 603 is close to the inner edge of the rod-shaped body 601, and the hook bottom of the top hook 603 is close to the axis of the rod-shaped body 601.

[0072] Located on the upper edge of the inner side of the rod-shaped body 601, and below the top hook portion 603, is a protruding edge for laterally pushing and holding the corresponding armature hook in position. This protruding edge extends laterally beyond the hook tip of the top hook portion 603. The contour curve of the protruding edge is divided into an upper pushing section 604a and a lower holding section 604b. The pushing section 604a is an inclined curve starting from the bottom of the hook of the top hook portion 603, and the holding section 604b is a straight line parallel to the moving direction of the rod-shaped body 601. The pushing section 604a and the holding section 604b are smoothly connected. In the initial stage of the upward movement of the vertical hook, the pushing section 604a generates an outward lateral pushing force on the armature hook in contact with it. In the middle and later stages of the upward movement of the vertical hook, the holding section 604b applies a holding force to the armature hook that has already undergone lateral displacement.

[0073] The distance from the bottom of the retaining section 604b to the bottom of the top hook 603 is greater than the distance from the tip of the top hook 603 to the bottom of the top hook 603. This distance difference is also the distance between the tip of the armature hook and the tip of the vertical hook in the disengaged state, and is therefore defined as the disengagement allowance, which is a tolerance margin. See also Figure 6 As shown, Figure 6D represents the unhooking allowance. Due to the existence of the unhooking allowance D, the hook tip of the armature hook does not contact the top hook of the vertical hook. Even if vibration or other situations occur, the top hook of the vertical hook will not catch the hook tip of the armature hook, thus avoiding the failure to unhook. The unhooking allowance ensures the reliability of the unhooking action under complex working conditions.

[0074] The length of the retaining section 604b of the convex edge corresponds to the tolerance range of the jacquard machine's lifting height allowed by its needle selection device. Within this tolerance range, the armature hook in contact with the convex edge remains in the dynamic magnetic gap 17 position. The retaining section 604b is actually a straight section, and the armature hook in contact with it within this section of the retaining section 604b will not have lateral displacement, but will remain in the dynamic magnetic gap 17 position. The dynamic magnetic gap 17 is the distance between the magnetic pole surface of the armature hook and the magnetic pole surface of the electromagnet under the action of the convex edge, and the value range of the dynamic magnetic gap 17 is 0 to 0.3 mm.

[0075] In the actual operation of a jacquard machine, errors exist in the position of the blade edges of multiple lifting knives due to transmission mechanisms and mechanical forces. The blades can be as long as 2 meters (even longer in high-needle-count jacquard machines), and deformation during operation can lead to positional errors at different points on the same blade. Different jacquard fabric patterns result in uneven force distribution at different points on the same blade, and even different forces on the sides of the blade and the ends of the blade can generate torsional torque, potentially causing permanent deformation. Therefore, the concept of "lifting knife tolerance" arises, referring to the range of blade height differences that the needle selection device can tolerate. Clearly, a needle selection device with a larger "lifting knife tolerance" is beneficial for the overall operation of the jacquard machine. This invention incorporates a retaining section with a raised edge, ensuring that the armature hook remains within a relatively small dynamic magnetic gap over a wide range. When the electromagnet coil is energized, the armature hook can be smoothly attracted to the closed magnetic circuit position, thus achieving the transition from "hooked" to "released" state of the vertical hook, thereby widening the "lifting knife tolerance." This is an important tolerance margin, which reduces the precision requirements of the needle selection device on the jacquard machine's knife lifting position and improves the reliability of the jacquard machine's overall operation switching.

[0076] The inner middle and lower parts of the rod-shaped body 601 are provided with a limiting protrusion 605 along its edge for engaging with the vertical hook guide rail and ensuring that the vertical hook does not undergo lateral displacement. The top end of the limiting protrusion 605 is parallel and straight-line connected to the bottom end of the protrusion retaining section 604b. Since the vertical hook is set in the vertical hook guide rail of the substrate 1, the vertical hook needs to have a matching rod-shaped body 601 to ensure that there is no lateral displacement when the vertical hook moves up and down in the vertical hook guide rail. Since the dynamic magnetic gap 17 is generated by the protrusion and has certain precision requirements, in order to ensure precision, it is necessary to ensure that the movement trajectory of the vertical hook is stable and that there is no other lateral displacement while the vertical hook moves up and down; otherwise, the size of the dynamic magnetic gap cannot be controlled.

[0077] At least one damping groove 606 is provided between the side ear portion 602 and the rod-shaped body 601 to block the vibration of the lifting knife, so as to prevent the vibration of the lifting knife from being transmitted to the top hook portion 603 through the side ear portion 602 and improve the reliability of the operation. The number of damping grooves 606 can be designed according to the requirements, for example, it can be designed as follows: Figure 6 The single-slot design shown can also be designed as follows: Figure 7 The dual-slot design is shown.

[0078] The aforementioned optimizations and improvements actually provide a new hook release technology, involving the design of the vertical hook shape and the hook release allowance formed by the linear guide rail and the raised edge of the vertical hook. This allows electromagnets to be stacked vertically with the hooks facing each other (the upper hook facing downwards, the lower hook facing upwards), so that the upper and lower electromagnets can use the same vertical hook. This technology is not currently disclosed in existing technologies. Although existing technologies involve stacking electromagnets, they use a scheme of vertical hooks of different lengths in the same direction, which would cause inconsistencies in the working states of the upper and lower needle selectors.

[0079] This invention improves and optimizes the magnetic circuit structure of existing needle selection devices:

[0080] The magnetic circuit structure in the A-side action structure of the present invention consists of a lower electromagnet 3a and two lower armature hooks 4a, and the magnetic circuit structure in the B-side action structure consists of an upper electromagnet 3b and two upper armature hooks 4b.

[0081] See Figure 8As shown, both the lower armature hook 4a and the upper armature hook 4b include a straight rod portion 401, a magnetic pole surface sliding contact portion 404, a magnetic pole surface attraction contact portion 405, a shaft hole portion 402, a hook tip portion 403, and a spring positioning post 406. The cross-section of the straight rod portion 401 is rectangular, but not limited to a rectangle. The shaft hole portion 402 is disposed at one end of the straight rod portion 401 through the magnetic pole surface sliding contact portion 404. The hook tip portion 403 is disposed at the other end of the straight rod portion 401 through the magnetic pole surface attraction contact portion 405. The spring positioning post 406 is disposed on the side wall of the straight rod portion 401 facing the electromagnet.

[0082] See Figures 1-3 As shown, the difference lies in the fact that the shaft hole 402 of the lower hook 4a is at the lower end of the straight rod 401, and the hook tip 403 is at the upper end of the straight rod 401, while the shaft hole 402 of the upper hook 4b is at the upper end of the straight rod 401, and the hook tip 403 is at the lower end of the straight rod 401. Furthermore, the hook tip 403 of the lower hook 4a is designed as a "lifting hook" structure, while the hook tip 403 of the upper hook 4b is designed as a "pulling hook" structure.

[0083] See Figure 8 As shown, both the lower electromagnet 3a and the upper electromagnet 3b are formed by winding enameled wire around an I-beam core 301. One end of the I-beam core 301 has a long magnetic pole 302, and the other end has a short magnetic pole 303. During installation, the long magnetic pole 302 of the lower electromagnet 3a is at the bottom, and the short magnetic pole 303 is at the top, while the long magnetic pole 302 of the upper electromagnet 3b is at the top, and the short magnetic pole 303 is at the bottom. Figure 8 As can be clearly seen, the long magnetic pole 302 has a first bend that curves backward at both ends, and the short magnetic pole 303 has a second bend that curves forward at both ends. The first bend and the second bend are offset from each other, and the offset is equal to the thickness of the straight rod 401. This is what distinguishes this invention from traditional solutions. The core of a traditional solution is usually a planar structure with the magnetic poles facing the same direction. The core of this invention is actually a three-dimensional spatial structure.

[0084] The recessed surface of the first bend serves as a sliding magnetic pole surface 304. A magnetically conductive plastic cover 306 is disposed in front of the sliding magnetic pole surface 304, with a gap between the magnetically conductive plastic cover 306 and the sliding magnetic pole surface 304 to form a groove for easy insertion of the straight rod portion 401. A magnetically conductive elastic element 307 for contacting the straight rod portion 401 is disposed in the groove. The side end face of the second bend serves as an attraction magnetic pole surface 305. The sliding magnetic pole surface 304 and the attraction magnetic pole surface 305, located on the same side, constitute two intersecting magnetic pole surfaces.

[0085] See Figures 2-3 As shown, during assembly, the shaft holes 402 of the lower bit hook 4a and the upper bit hook 4b are rotatably mounted on the first rotating shaft 8a and the second rotating shaft 8b, respectively. One end of the first spring 5a is fixed on the spring positioning post 406 of the lower bit hook 4a, and one end of the second spring 5b is fixed on the spring positioning post 406 of the upper bit hook 4b. The other ends of the first spring 5a and the second spring 5b are respectively fixedly connected to corresponding points on the side wall of the electromagnet frame 9.

[0086] See Figure 8 As shown, after assembly, the magnetic pole surface sliding contact portion 404 is tightly and slidably embedded in the groove formed by the sliding magnetic pole surface 304, the magnetically conductive plastic cover 306, and the magnetically conductive elastic element 307. The magnetic pole surface attracting contact portion 405 is laterally aligned with the attracting magnetic pole surface 305. When the magnetic pole surface attracting contact portion 405 is in contact with the attracting magnetic pole surface 305, three sides of the magnetic pole surface sliding contact portion 404 are in contact with the sliding magnetic pole surface 304, the magnetically conductive plastic cover 306, and the magnetically conductive elastic element 307, respectively, forming a three-sided magnetically conductive structure with excellent magnetic conductivity. This allows the sliding magnetic pole surface 304, the magnetic pole surface sliding contact portion 404, the straight rod portion 401, the magnetic pole surface attracting contact portion 405, and the attracting magnetic pole surface 305 to form a closed magnetic circuit.

[0087] After assembly, the mating surfaces of the hook tip 403 of the lower hook 4a and the top hook 603 of the first vertical hook 6a are at the same height as the mating surfaces of the hook tip 403 of the upper hook 4b and the top hook 603 of the second vertical hook 6b when in the hooked state.

[0088] When the vertical hook moves upward, the pushing section of the upper convex edge of the vertical hook laterally pushes the armature hook in contact with it to rotate around the corresponding pivot. The magnetic pole surface attraction contact 405 of the armature hook moves from the static magnetic gap position away from the magnetic pole surface 305 of the electromagnet to the direction close to the magnetic pole surface 305 of the electromagnet. The retaining section of the convex edge keeps the magnetic pole surface attraction contact 405 of the armature hook in the dynamic magnetic gap position close to the magnetic pole surface 305 of the electromagnet. At this time, the coil of the electromagnet is energized and attracts the magnetic pole surface attraction contact 405 of the armature hook to the closed magnetic circuit position. The retaining section of the convex edge does not generate a force for the lateral displacement of the armature hook, thereby causing the hook tip of the armature hook to disengage from the top hook of the vertical hook.

[0089] When the vertical hook descends and the coil of the electromagnet is not energized, the magnetic pole surface 305 of the electromagnet does not generate an attraction force on the magnetic pole surface attraction contact part 405 of the armature hook. The spring will give the armature hook an outward elastic force. When the vertical hook descends to the point where its top hook part is aligned with the hook tip of the armature hook, the spring gains release space and rotates the magnetic pole surface attraction contact part 405 of the armature hook directly from the closed magnetic circuit position through the dynamic magnetic gap position to the static magnetic gap position. At this time, the hook tip of the armature hook is just engaged with the top hook part of the vertical hook, thereby connecting the hook tip of the armature hook with the top hook part of the vertical hook.

[0090] from Figure 8 As can be clearly seen, the shaft hole portion 402 is located outside the closed magnetic circuit and does not participate in the magnetic conduction path of the closed magnetic circuit. This design not only allows the magnetic pole face attraction contact portion 405 of the armature hook to be aligned with the attraction magnetic pole face 305 of the I-shaped iron core 301 in terms of height, so that when the magnetic circuit is closed, the magnetic pole face attraction contact portion 405 of the armature hook can be in close contact with the end face of the attraction magnetic pole face 305 of the I-shaped iron core 301, but also allows the magnetic pole face sliding contact portion 404 of the armature hook to maintain sliding contact with the sliding magnetic pole face 304 of the I-shaped iron core 301 when the armature hook rotates around the axis at a certain angle, thus maintaining a low magnetic resistance magnetic circuit connection.

[0091] from Figure 8 As can be clearly seen, the electromagnet and the armature hook form a closed magnetic circuit. In the prior patent 1 mentioned in the background art, the armature hook's rotation axis is located at one magnetic pole of the iron core, forming an arc-shaped magnetic gap. However, in actual manufacturing, the arc-shaped magnetic gap is difficult to control; a small gap may result in inflexible rotation, while a large gap affects the electromagnet's attraction force. In contrast, the rotation axis of this invention is not in a closed magnetic circuit, and the armature hook makes planar sliding contact with the side of the magnetic pole. This results in a smaller magnetic gap and makes it easier to ensure dimensional consistency and batch uniformity during parts manufacturing.

[0092] The advantage of having the shaft at the magnetic pole is that it provides constant magnetic reluctance. Simply removing the shaft from the magnetic pole position creates a double-ended magnetic gap, where the armature hooks form movable magnetic gaps with varying magnetic reluctance at both ends of the I-beam core, making it more difficult to control. The technical solution of this invention, with its planar sliding magnetic gap, also features relatively stable magnetic reluctance, avoiding the aforementioned double-ended magnetic gap. This spatially tortuous magnetic circuit design also achieves another purpose: by torturing the magnetic circuit, it connects the electromagnet located in the middle position with the armature hooks located on both sides, allowing two independent needle selection devices to be accommodated in a single unit.

[0093] The magnetic pole of the armature hook of the present invention can move between three positions: from the static magnetic gap 18 to the dynamic magnetic gap 17 is a segment with a large stroke, which is achieved by the vertical hook protrusion pushing the armature hook to move laterally when the vertical hook moves upward (using external force to achieve a large stroke displacement); from the dynamic magnetic gap 17 to the closed magnetic circuit position is a segment with a small stroke, which is achieved by the electromagnetic force after the electromagnet is energized (using internal force to achieve a small stroke displacement).

[0094] Figure 2 This is a schematic diagram of the installation of the A-side action structure of the present invention, which clearly shows that... Figure 2 The right side is in the disengaged state. The lower armature hook 4a on the right is pushed by the protruding edge of the first vertical hook 6a on the right towards the short magnetic pole on the right side of the lower electromagnet 3a, i.e., the position of the dynamic magnetic gap 17, which is very small. It is known that the electromagnetic force of an electromagnet is inversely proportional to the square of the distance. In the case of a small magnetic gap, the energization of the coil of the lower electromagnet 3a will generate a relatively large electromagnetic force, attracting the lower armature hook 4a on the right towards the short magnetic pole on the right side of the lower electromagnet 3a, i.e., the closed magnetic circuit position. At this time, the first spring 5a on the right is compressed. As long as the attraction force of the lower electromagnet 3a on the lower armature hook 4a when energized is greater than the elastic force of the first spring 5a on the right, then when the first vertical hook 6a on the right moves down, even without the action of the protruding edge on the first vertical hook 6a, the lower armature hook 4a on the right will remain in this closed magnetic circuit position by electromagnetic force. When the first vertical hook 6a on the right continues to move downwards until its hook tip aligns with the hook tip of the lower bit hook 4a on the right, the existence of a disengagement allowance ensures that the first vertical hook 6a on the right can smoothly descend below the lower bit hook 4a on the right, achieving reliable disengagement. This is actually a new disengagement technology that uses disengagement allowance parameters from the design phase to ensure operational reliability under complex working conditions.

[0095] Limiting the dynamic magnetic gap 17 to a relatively small range, such as 0–0.3 mm, is crucial to this invention and also a matter of tolerance margin. With a small magnetic gap, the electromagnet coil can generate sufficient attraction with relatively low power consumption to engage the armature hook with the magnetic pole and maintain this state. Limiting the dynamic magnetic gap 17 to 0.4 mm is not impossible, but simple calculations show that the electromagnet would require approximately 80% more electromagnetic force, which is clearly disadvantageous for low-power designs. Setting the dynamic magnetic gap 17 to 0.2 mm would certainly result in lower power consumption, but this value also has the function of compensating for machining errors, assembly errors, and deformation errors during operation. Therefore, setting the dynamic magnetic gap to 0.2 mm implies higher precision requirements for components, thus increasing costs.

[0096] Figure 2The left side is in the hook state. The lower armature hook 4a on the left is pushed away from the short magnetic pole on the left side of the lower electromagnet 3a by the first spring 5a on the left, thus hooking the first vertical hook 6a on the left, forming a considerable static magnetic gap 18. The lateral displacement of the lower armature hook 4a on the left is actually a rotation around the corresponding pivot. In this embodiment, the pivot is located below the lower electromagnet 3a. The A-side guide rails on both sides of the substrate 1 engage with the protruding edges on the two first vertical hooks 6a rods, ensuring that the first vertical hooks 6a do not have lateral displacement when moving up and down.

[0097] Figure 3 This is a schematic diagram of the installation on side B of the present invention, which clearly shows that... Figure 3 The right side is in the disengaged state. The second vertical hook 6b on the right pushes the upper armature hook 4b on the right towards the short magnetic end of the upper electromagnet 3b, placing it in the dynamic magnetic gap position. The second spring 5b on the right is compressed. At this time, the coil of the upper electromagnet 3b is energized. The attraction force of the upper electromagnet 3b is greater than the elastic force of the second spring 5b on the right. The upper armature hook 4b on the right will be drawn into the closed magnetic circuit position and held in this position. If the second vertical hook 6b on the right moves downward, disengagement can be achieved.

[0098] Figure 3 The left side is in the hooked state. Under the action of the second spring 5b on the left side, the upper armature hook 4b moves away from the short magnetic pole of the upper electromagnet 3b, to the static magnetic gap 18 position, where it is hooked with the second vertical hook 6b on the left. It can be seen that the shape of the upper armature hook 4b is different from that of the lower armature hook 4a, but the shape of the second vertical hook 6b is the same as that of the first vertical hook 6a. This design is very useful in high-density needle selectors that require two electromagnets to be stacked one above the other. In such cases, conventional technology can only use a combination of long vertical hooks (for the upper armature hook) and short vertical hooks (for the lower armature hook), and this structural difference between the long and short vertical hooks will cause differences in action.

[0099] See Figures 2-3 As shown, the surface of the substrate 1 is provided with a limiting protrusion to prevent the armature hook from moving excessively laterally outward under the action of the spring, and the limiting protrusion does not interfere with the movement of the vertical hook within the vertical hook guide rail.

[0100] See Figure 9As shown, the top of the electromagnet frame 9 is provided with a printed circuit board slot 10, and metal springs 11 for connecting the coil leads of the electromagnet are provided on both sides of the printed circuit board slot 10. The left and right sides of the electromagnet frame 9 are provided with coil lead grooves 12, first spring mounting holes 13, and second spring mounting holes 14. The first spring 5a and the second spring 5b are respectively fixed to corresponding points on the left and right sides of the electromagnet frame 9 through the first spring mounting holes 13 and the second spring mounting holes 14.

[0101] See Figure 10 As shown, the top of the partition 2 is provided with a heat sink 15 for dissipating heat from the dual electromagnet coils and also for electromagnetic shielding. The heat sink 15 is made of a non-magnetic metal material, and at least one side of the heat sink 15 is exposed and in good contact with the metal body to conduct heat and electricity to the outside. After assembly, the heat sink 15 is in close contact with the coils of the upper electromagnet 3b and the lower electromagnet 3a. If multiple high-density needle selection device units are stacked, the heat sinks 15 of two adjacent high-density needle selection device units should be in good contact with each other to maintain heat and electricity conduction.

[0102] The electromagnet coil in the needle selection device is a heating element. During long-term continuous operation, the temperature at the center of the coil becomes extremely high, which can even damage the insulation layer of the enameled wire, causing a short circuit and burning out the coil. Currently, most coils are encapsulated in plastic, which has poor thermal conductivity, and the dense installation of multiple coils is not conducive to heat dissipation. The heat sink in this invention is placed close to the coil to conduct heat away. The heat sink is made of a non-magnetic material with good thermal and electrical conductivity, such as copper, aluminum, or their alloys. While conducting heat, it also provides both magnetic and electrical shielding, thus playing a role in resisting electromagnetic interference.

[0103] This invention mounts components such as the lower electromagnet 3a, the upper electromagnet 3b, the first vertical hook guide rail, the second vertical hook guide rail, the first vertical hook 6a, the second vertical hook 6b, the first thin pulley block 7a, the second thin pulley block 7b, the lower armature hook 4a, the upper armature hook 4b, the first spring 5a, and the second spring 5b onto a single base plate 1 to form a unit, thereby realizing the needle selection device for accommodating two sets of double-position compound jacquard machines in one unit.

[0104] The high-density needle selection device of this invention does not reduce the number of parts, but rather rationally arranges the space, making the relative positions of the parts more compact and correspondingly increasing the precision requirements. In the design of electromagnets, the attraction force of an electromagnet is basically positively correlated with its volume; therefore, to ensure the attraction force of an electromagnet, it is necessary to ensure the space of the electromagnet. This invention uses two electromagnets stacked one on top of the other, effectively maintaining the volume of a single electromagnet, thereby ensuring that the electromagnet has sufficient attraction force. The electromagnet frame is used to relatively fix the positional relationship of the electromagnet poles, facilitating production and assembly, ensuring precision, and guaranteeing quality for mass production.

[0105] Based on the high-density needle selection device based on a thin pulley system disclosed in the embodiments of the present invention, see [link to relevant documentation]. Figure 11 As shown, the present invention can also be used to manufacture a 16-needle high-density needle selection device assembly composed of eight of the high-density needle selection devices based on thin pulley blocks disclosed above. During stacking, the devices can be stacked alternately with spacers in front and substrates behind, or with substrates in front and spacers behind.

[0106] It should be noted that the technical solution of this invention is not limited to manufacturing a 16-needle high-density needle selection device assembly; it can also be used to manufacture needle selection device assemblies with even higher densities. Based on this, this invention can further be used to manufacture an electronic jacquard machine equipped with the high-density needle selection device assembly as disclosed above.

[0107] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-density needle selection device based on a thin pulley system, characterized in that: It includes a substrate (1) and a spacer (2). The spacer (2) covers the front or rear side of the substrate (1). Both the front and rear sides of the substrate (1) have a pulley group chute in the middle and full-length linear vertical hook guides on the left and right sides; A pair of vertically identical hooks are respectively arranged in the vertical hook guides on the front and rear sides of the substrate (1); A set of identical thin pulley groups are respectively arranged in the pulley group chutes on the front and rear sides of the substrate (1). The two pairs of the vertical hooks respectively drive their corresponding sets of the thin pulley groups to slide up and down through the upper pulley wires; The thin pulley group includes two vertical plates (701), two upper cross plates (702), two middle cross plates (703), two lower cross plates (704) and two thin pulleys (705); The two upper cross plates (702) are joined together face to face to form an upper fixing plate, the two middle cross plates (703) are joined together face to face to form a middle fixing plate, and the two lower cross plates (704) are joined together face to face to form a lower fixing plate; The upper fixing plate, the middle fixing plate and the lower fixing plate form a "king" shaped bracket under the front and rear clamping of the two vertical plates (701); There is a pulley installation gap between the two vertical plates (701) under the support of the upper fixing plate, the middle fixing plate and the lower fixing plate. The pulley installation gap forms an upper pulley installation gap position and a lower pulley installation gap position in the area between the upper fixing plate and the middle fixing plate and in the area between the middle fixing plate and the lower fixing plate respectively; The two thin pulleys (705) are respectively and freely rotatably installed in the upper pulley installation gap position and the lower pulley installation gap position through corresponding sliding bearing assemblies; The width of the vertical plate (701) is smaller than the diameter of the thin pulley (705), and a buffer and shock absorption structure (706) is arranged in the middle of the vertical plate (701) by grooving; The width of the middle cross plate (703) is slightly larger than the diameter of the thin pulley (705), and the thicknesses of the left and right ends of the middle cross plate (703) are the same to serve as positioning sliders (707) when the thin pulley group moves in the pulley group chute; The widths of the upper cross plate (702) and the lower cross plate (704) are equal, and the widths of the upper cross plate (702) and the lower cross plate (704) are both smaller than the width of the middle cross plate (703) and larger than the width of the vertical plate (701); The top of the substrate (1) is provided with two electromagnets stacked vertically by an electromagnet frame (9), and each electromagnet has two intersecting magnetic pole surfaces. On the left and right sides of the two electromagnets, there is a pair of armature hooks for cooperating with a pair of vertical hooks on the same side. The two pairs of armature hooks are designed differently and are located inside the pair of vertical hooks on the same side. The shaft holes of the two pairs of armature hooks are rotatably connected to the front and rear sides of the substrate (1) by a pair of rotating shafts provided on the substrate (1). The rear sides of the hook tips of the two pairs of armature hooks are elastically connected to the left and right sides of the electromagnet frame (9) by a pair of springs. The intersecting magnetic pole surfaces of the two electromagnets cooperate with the two sides of their respective pair of armature hooks to form a closed magnetic circuit. The two pairs of rotating shafts are located outside the two closed magnetic circuits, and the hook tips and magnetic poles of the armature hooks are on the same side of the rotating shafts.

2. The high-density needle selection device based on a thin pulley system according to claim 1, characterized in that: The structures on the front and back sides of the substrate (1) are surface A and surface B, respectively. The pulley groove and the vertical hook guide rail on the front side of the substrate (1) are surface A pulley groove and surface A vertical hook guide rail, respectively. The pulley groove and the vertical hook guide rail on the rear side of the substrate (1) are surface B pulley groove and surface B vertical hook guide rail, respectively. The two pairs of vertical hooks are a pair of first vertical hooks (6a) and a pair of second vertical hooks (6b) with the same structure. The two thin pulley groups are structurally similar. The first thin pulley block (7a) and the second thin pulley block (7b) are identical; the two electromagnets stacked on top of each other are an upper electromagnet (3b) and a lower electromagnet (3a) with symmetrical structures; the two pairs of armature hooks are a lower armature hook (4a) and an upper armature hook (4b) with different structures; the two pairs of springs are a pair of first springs (5a) and a pair of second springs (5b) with identical structures; the two pairs of rotating shafts are a first rotating shaft (8a) and a second rotating shaft (8b) with identical structures. The specific structure on surface A is as follows: a pair of first vertical hooks (6a) are slidably disposed on the left and right sides of the vertical hook guide rails on surface A; the first thin pulley group (7a) is slidably disposed on the pulley group grooves on surface A; the pair of first vertical hooks (6a) are connected to the two ends of the upper pulley line of the first thin pulley group (7a); the two ends of the lower pulley line of the first thin pulley group (7a) are fixed and connected to the first head wire connector (16a); the first vertical hooks (6a) are located on the vertical hook guide rails on both sides of surface A. The lifting and lowering of the tool within the rail drives the first thin pulley block (7a) to rise and fall within the pulley block groove on surface A; the lower electromagnet (3a) is fixedly installed at the lower end of the electromagnet frame (9), and a pair of lower bit hooks (4a) are located on the left and right sides of the lower electromagnet (3a), respectively, and the pair of lower bit hooks (4a) are located inside a pair of first vertical hooks (6a). The shaft holes of the pair of lower bit hooks (4a) are connected to the corresponding points on the front side of the substrate (1) through a pair of first rotating shafts (8a). The hook tips of the pair of lower armature hooks (4a) are elastically connected to corresponding points on the left and right sides of the lower part of the electromagnet frame (9) via a pair of first springs (5a). The intersecting magnetic pole surfaces of the lower electromagnets (3a) cooperate with the two sides of the pair of lower armature hooks (4a) to form corresponding A-plane closed magnetic circuits. Both first rotating shafts (8a) are located outside the A-plane closed magnetic circuits, and the hook tips and magnetic poles of the lower armature hooks (4a) are located on the first rotating shafts (8a). On the same side; when the lower electromagnet (3a) is energized, the lower armature hook (4a) remains in the closed magnetic circuit position on surface A, and the hook tip of the lower armature hook (4a) does not contact the hook tip of the first vertical hook (6a), and is in a disengaged state; when the lower electromagnet (3a) is not energized, the lower armature hook (4a) moves away from the magnetic pole of the lower electromagnet (3a) under the action of the first spring (5a), and the hook tip of the lower armature hook (4a) hooks the hook tip of the first vertical hook (6a) in a lifting manner, and is in a hooked state; The specific structure on surface B is as follows: a pair of second vertical hooks (6b) are slidably disposed on the left and right sides of the vertical hook guide rails on surface B; the second thin pulley group (7b) is slidably disposed on the pulley group groove on surface B; the pair of second vertical hooks (6b) are connected to the upper pulley line of the second thin pulley group (7b); the two ends of the lower pulley line of the second thin pulley group (7b) are fixed and connected to the second head wire connector (16b); the second vertical hooks (6b) are on the vertical hook guide rails on both sides of surface B. The lifting and lowering mechanism drives the second thin pulley block (7b) to rise and fall within the pulley block groove on surface B; the upper electromagnet (3b) is fixedly installed on the upper end of the electromagnet frame (9), and a pair of upper armature hooks (4b) are located on the left and right sides of the upper electromagnet (3b), respectively, and the pair of upper armature hooks (4b) are located inside a pair of second vertical hooks (6b). The shaft holes of the pair of upper armature hooks (4b) are connected to the corresponding points on the rear side of the substrate (1) through a pair of corresponding second rotating shafts (8b). The hook tips of the pair of upper armature hooks (4b) are elastically connected to corresponding points on the upper left and right sides of the electromagnet frame (9) via a pair of second springs (5b). The intersecting magnetic pole surfaces of the upper electromagnets (3b) cooperate with the two sides of the pair of upper armature hooks (4b) to form corresponding B-plane closed magnetic circuits. Both second rotating shafts (8b) are located outside the B-plane closed magnetic circuits, and the hook tips and magnetic poles of the upper armature hooks (4b) are both on the second rotating shafts (8b). On the same side; when the upper electromagnet (3b) is energized, the upper armature hook (4b) remains in the closed magnetic circuit position on surface B, and the hook tip of the upper armature hook (4b) does not contact the hook tip of the second vertical hook (6b), and is in a disengaged state; when the upper electromagnet (3b) is not energized, the upper armature hook (4b) moves away from the magnetic pole of the upper electromagnet (3b) under the action of the second spring (5b), and the hook tip of the upper armature hook (4b) hooks the hook tip of the second vertical hook (6b) in a pulling manner, and is in a hooked state.

3. The high-density needle selection device based on a thin pulley system according to claim 1, characterized in that: The sliding bearing assembly includes a journal (713) and a bushing (714). The journal (713) is disposed on the axis of the thin pulley (705), and the bushing (714) is disposed on the vertical plates (701) on the front and rear sides respectively. The journal (713) and the bushing (714) are made of metal materials with similar hardness, wherein the hardness ratio of the bushing (714) is greater than that of the journal (713). An oil reservoir (715) is provided on the journal (713), and a sealing cap (708) for covering the oil reservoir is provided on the outer periphery of the bushing (714).

4. The high-density needle selection device based on a thin pulley system according to claim 2, characterized in that: The vertical hook includes a rod-shaped body (601). A side ear (602) for engaging with the blade edge is provided at the middle of the outer side of the rod-shaped body (601). A top hook (603) is provided at the top of the inner side of the rod-shaped body (601), with the hook tip of the top hook (603) close to the inner edge of the rod-shaped body (601) and the hook bottom close to the axis of the rod-shaped body (601). A protruding edge is provided at the upper edge of the inner side of the rod-shaped body (601) and below the top hook (603) to laterally push and hold the corresponding armature hook in position. The protruding edge laterally protrudes beyond the hook tip of the top hook (603). The contour curve of the protruding edge is divided into a pushing section (604a) at the upper end and a holding section (604b) at the lower end. The pushing section (604a)... The retaining section (604b) is a straight line parallel to the moving direction of the rod-shaped body (601), and the pushing section (604a) is smoothly connected to the retaining section (604b). The distance from the bottom of the retaining section (604b) to the bottom of the top hook (603) is greater than the distance from the hook tip of the top hook (603) to the bottom of the top hook (603). The length of the retaining section (604b) of the convex edge corresponds to the tolerance range of the jacquard machine knife lifting height allowed by its needle selection device. The middle and lower parts of the inner side of the rod-shaped body (601) are provided with a limiting convex edge (605) for engaging with the vertical hook guide rail and ensuring that the vertical hook does not have lateral displacement. The top of the limiting convex edge (605) is connected to the bottom of the retaining section (604b) of the convex edge in a straight line.

5. The high-density needle selection device based on a thin pulley system according to claim 4, characterized in that: At least one damping groove (606) is provided between the side ear portion (602) and the rod-shaped body (601) to block the vibration of the lifting knife.

6. The high-density needle selection device based on a thin pulley system according to claim 2, characterized in that: The armature hook includes a straight rod portion (401), a magnetic pole surface sliding contact portion (404), a magnetic pole surface attracting contact portion (405), a shaft hole portion (402), a hook tip portion (403), and a spring positioning post (406). The straight rod portion (401) has a rectangular cross-section. The shaft hole portion (402) is disposed at one end of the straight rod portion (401) through the magnetic pole surface sliding contact portion (404). The hook tip portion (403) is disposed at the other end of the straight rod portion (401) through the magnetic pole surface attracting contact portion (405). The spring positioning post (406) is disposed on the side wall of the straight rod portion (401) facing the electromagnet. The electromagnet is formed by winding enameled wire around an I-shaped iron core (301). One end of the I-shaped iron core (301) has a long magnetic pole (302), and the other end has a short magnetic pole (303). The long magnetic pole (302) has a first bend that curves backward at both ends, and the short magnetic pole (303) has a second bend that curves forward at both ends. The first bend and the second bend are offset from each other, and the offset is equal to the thickness of the straight rod (401). The concave surface of the first bend serves as a sliding magnetic pole. The side end face of the second bend serves as the magnetic pole face (305) for attraction. The sliding magnetic pole face (304) and the magnetic pole face (305) located on the same side constitute two intersecting magnetic pole faces. A magnetically conductive plastic cover (306) is provided in front of the sliding magnetic pole face (304). There is a gap between the magnetically conductive plastic cover (306) and the sliding magnetic pole face (304) to form a groove for easy insertion of the straight rod (401). A magnetically conductive elastic element (307) for contacting the straight rod (401) is provided in the groove. After assembly, the shaft hole (402) is rotatably mounted on the rotating shaft, one end of the spring is fixed to the spring positioning post (406), and the other end of the spring is fixedly connected to the corresponding point on the side wall of the electromagnet frame (9); the magnetic pole surface sliding contact part (404) is tightly embedded in the groove formed by the sliding magnetic pole surface (304), the magnetically conductive plastic cover (306), and the magnetically conductive elastic element (307), and the magnetic pole surface attracting contact part (405) is laterally aligned with the attracting magnetic pole surface (305); the magnetic pole surface attracting contact part (405) contacts the attracting magnetic pole surface (305) at the... In this case, the three sides of the sliding contact portion (404) of the magnetic pole surface are in contact with the sliding magnetic pole surface (304), the magnetically conductive plastic cover (306), and the magnetically conductive elastic element (307), respectively, so that the sliding magnetic pole surface (304), the sliding contact portion (404) of the magnetic pole surface, the straight rod portion (401), the magnetic pole surface attraction contact portion (405), and the attraction magnetic pole surface (305) constitute the closed magnetic circuit; the shaft hole portion (402) is located outside the closed magnetic circuit and does not participate in the magnetic conductive path of the closed magnetic circuit; the mating points of the two pairs of armature hooks and their respective pairs of vertical hooks are at the same position and height.

7. The high-density needle selection device based on a thin pulley system according to claim 1, characterized in that: The top of the electromagnet frame (9) is provided with a printed circuit board slot (10), and metal springs (11) for connecting the coil leads of the electromagnet are provided on both sides of the printed circuit board slot (10). The left and right sides of the electromagnet frame (9) are provided with coil lead grooves (12), first spring mounting holes (13) and second spring mounting holes (14).

8. The high-density needle selection device based on a thin pulley system according to claim 1, characterized in that: The top of the partition (2) is provided with a heat sink (15) for dissipating heat from the coil of the electromagnet and also for electromagnetic shielding. The heat sink (15) is made of non-magnetic metal material, and at least one side of the heat sink (15) is exposed and in good contact with the metal body to conduct heat and electricity to the outside.

9. A high-density needle selection device assembly, characterized in that: The 16-needle high-density needle selection device assembly is formed by stacking eight high-density needle selection devices based on thin pulley blocks as described in any one of claims 1-8.

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