A compact three-position needle selection device and its components, electronic jacquard machine

Abstract

The application discloses a compact three-position needle selection device and an assembly and an electronic jacquard machine thereof, comprising a front and rear split first base sheet and a second base sheet; a pair of vertical hooks and a group of lifting pulley blocks are arranged on the front and back groove plates of the first base sheet, the two groups of lifting pulley blocks are stacked in an up-down staggered manner, and the upper pulley lines of the two groups of lifting pulley blocks are connected with the two pairs of vertical hooks respectively; two electromagnets are arranged on the top of the first base sheet in a stacked manner, a pair of armature hooks is arranged on the two sides of the two electromagnets respectively; a connecting pulley is arranged at the bottom of the first base sheet, one end of the lower pulley line of the two groups of lifting pulley blocks is connected with the lower edge of the connecting pulley in a positive or negative oblique line manner and then is connected in a smooth transition manner, and the other end of the lower pulley line of the two groups of lifting pulley blocks is fixed and connected with a first thread joint respectively. The application realizes that the first thread output has three positions, and 8 needle three-position assemblies can correspond to 4*3.5cm 2 The projection area is the assembly of the double-shed carpet jacquard machine with the highest needle lifting density at present.

Description

Technical Field

[0001] This invention belongs to the technical field of electronic jacquard machines in textile machinery, specifically relating to a compact three-position needle selection device and its components, and an electronic jacquard machine. 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 The projected area is approximately 5714 stitches per square meter, or 0.57 stitches per square centimeter. Using this needle selection device to manufacture jacquard machines, a 5120-stitch head would have a projected area of ​​nearly 1 square meter, while a 10,000-stitch head would require 2 square meters. Larger needle count heads are mechanically difficult to manufacture. The excessive size of the jacquard head also presents installation difficulties, requiring a raised scaffold. This is a bottleneck limiting the development of high-stitch jacquard machines. If a compact three-position needle selection device were available, for example, doubling the needle density of the selection device, then manufacturing 10,000-stitch or even more would not be difficult.

[0007] For carpet jacquard, a three-position needle selection device is needed to form the double shed required by the double carpet loom. Currently, one solution in the existing technology is to connect two two-position needle selection devices in series to form a three-position needle selection device, turning two needles into one needle. This results in a lower needle density for carpet jacquard.

[0008] Chinese invention application "Yarn selection device, double shed weaving system and loom equipped with such 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 use a scheme of two electromagnets stacked one above the other.

[0009] The solution in prior patent 2 requires the jacquard machine to have two sets of lifting knives, one above the other, and suffers from the problems of large electromagnet size and high power consumption, making it not compact enough. Prior patent 1, on the other hand, proposes a solution that uses two electromagnets to control a "pair of hooks". Here, the "hook" corresponds to the "vertical hook" in the needle selection device, and the "pair of hooks" is a "pair" composed of two related hooks.

[0010] The solution in prior patent 1 cannot directly generate a three-position opening; it requires the action of a complex pulley system connected to the "hook pair" to generate a three-position opening. Since the "hook pair" consists of two hooks moving in conjunction with each other, unlike two independently moving vertical hooks, the solution in prior patent 1 cannot replace two independent vertical hooks to increase the needle lifting density of the two-position needle selection device, nor can it lead to a high-density solution. Summary of the Invention

[0011] To overcome the shortcomings of the existing technology, the present invention provides a compact three-position needle selection device and its components, and an electronic jacquard machine.

[0012] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, the present invention is implemented through the following technical solution:

[0013] A compact three-position needle selection device includes a first substrate and a second substrate joined together front and back. A pair of vertical hooks and a set of lifting pulleys are slidably mounted on both the front and back grooves of the first substrate. The two sets of lifting pulleys are stacked in a staggered manner due to the concave-convex design of the first substrate itself. The two pairs of vertical hooks drive the two sets of lifting pulleys to slide up and down via corresponding upper pulley lines. Two electromagnets are stacked vertically on a partition at the top of the first substrate via an electromagnet frame. Each electromagnet has two intersecting magnetic pole surfaces and can cooperate with its corresponding pair of armature hooks. A closed magnetic circuit is formed; two pairs of armature hooks are respectively located on the left and right sides of the two electromagnets, and the shaft holes of the two pairs of armature hooks are rotatably connected to the corresponding rotating shafts on the front and back sides of the spacer, respectively. 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 through springs. When the electromagnet is energized, the corresponding armature hook remains in its closed magnetic circuit position, and the hook tip of the armature hook does not contact the hook tip of the corresponding vertical hook, and is in a disengaged state. When the electromagnet is not energized, the corresponding armature hook leaves the closed magnetic circuit position under the action of the corresponding spring, and the hook tip of the armature hook contacts the hook tip of the vertical hook, and is in a hooked state.

[0014] The bottom of the first substrate is provided with one or two connecting pulleys with ball bearings via an extension piece. One end of the lower sliding pulley lines of the upper and lower sets of lifting pulleys smoothly transitions along the lower edge of the connecting pulleys in a forward or reverse diagonal manner before connecting to form a shared lower sliding pulley line for both sets of lifting pulleys. One end of the shared lower sliding pulley line is fixed, and the other end is connected to the first connector output, thereby enabling first line output at three positions:

[0015] When all four vertical hooks on both sides are in the high position, the first line output position is in the first working position.

[0016] When one of the vertical hooks on the front and both of the vertical hooks on the back are in a high position, and the other vertical hook on the front is in a low position, the first line output position is in the second working position; the difference between the second working position and the first working position is one opening stroke.

[0017] When one vertical hook on the front and one vertical hook on the back are both in a high position, and the other vertical hook on the front and the other vertical hook on the back are in a low position, the first line output position is in the third working position; the difference between the third working position and the second working position is one opening stroke, and the difference between the third working position and the first working position is two opening strokes.

[0018] Furthermore, the connecting pulley is installed in the interlayer of the extension piece at an angle to the left or right, so as to bridge the upper and lower sets of the lifting pulley groups, so that the lower pulley lines of the front and rear sets of the lifting pulley groups can smoothly enter the lower edge of the connecting pulley from both sides and connect to form a three-position head line.

[0019] The inclination direction of the connecting pulley is determined by the inclination direction of the connecting pulley mounting surface within the extension plate interlayer.

[0020] When the mounting surface of the connecting pulley is tilted to the right, the extension piece is a type 1 extension piece with a Z-shaped structure in longitudinal section. At this time, the connecting pulley is tilted to the right and is used to connect the left end of the lower pulley line of the upper pulley group with the right end of the lower pulley line of the lower pulley group, that is, a positive oblique line connection.

[0021] When the connecting pulley is tilted to the left, the extension piece is a type 2 extension piece with a reverse Z-shaped structure in longitudinal section. At this time, the connecting pulley is tilted to the left and is used to connect the right end of the lower pulley line of the upper pulley group with the left end of the lower pulley line of the lower pulley group, that is, to connect in a reverse oblique line manner.

[0022] Furthermore, the front groove plate of the first substrate is provided with four functional segments from top to bottom: a vertical hook groove segment of the upper pulley group, a line groove segment of the upper pulley group, a pulley groove segment of the upper pulley group, and a line groove segment of the lower pulley group; the back groove plate of the first substrate is provided with four functional segments from top to bottom: a vertical hook groove segment of the lower pulley group, a line groove segment of the upper pulley group, a pulley groove segment of the lower pulley group, and a line groove segment of the lower pulley group.

[0023] The vertical hook groove section of the upper pulley group corresponds to the vertical hook groove section of the lower pulley group in terms of position and thickness; the pulley groove section of the upper pulley group corresponds to the upper pulley groove section of the lower pulley group in terms of position, and the thickest pulley support section of the upper pulley groove section is located at the center of the first substrate, while the upper pulley groove section of the lower pulley group is located on both sides of the first substrate, and they can be nested without spatial conflict; the lower pulley groove section of the upper pulley group corresponds to the lower pulley groove section in terms of position, and the lower pulley groove section of the upper pulley group is located on both sides of the first substrate, and does not conflict with the pulley support section of the lower pulley groove section located at the center of the first substrate; the upper pulley groove section and the lower pulley groove section are designed to be stacked in a staggered manner on both sides, and the upper pulley groove section and the lower pulley groove section have the same thickness.

[0024] Furthermore, both the first substrate and the second substrate are plastic parts formed by injection molding in one step. Each of the first and second substrates has snap-fit ​​fasteners on both its front and back sides. The front side of each second substrate is fitted to the back side of its corresponding first substrate via the corresponding snap-fit ​​fastener, and the back side of each first substrate is fitted to the back side of the second substrate to which the adjacent first substrate belongs via the corresponding snap-fit ​​fastener. Additionally, the lower side end faces of the first substrate and the second substrate are respectively provided with positioning notches for determining whether the fitting is correct. When the first substrate and the second substrate are fitted together with the correct side grooves facing each other, the positioning notches on the first substrate and the positioning notches on the second substrate fit together horizontally.

[0025] Furthermore, the two pairs of vertical hooks are a pair of first vertical hooks and a pair of second vertical hooks with the same structure; the two lifting pulley groups are an upper pulley group and a lower pulley group with the same structure; the two electromagnets stacked on top of each other are an upper electromagnet and a lower electromagnet with symmetrical structure; the two pairs of armature hooks are an upper armature hook and a lower armature hook with different structures; the two pairs of springs are a pair of first springs and a pair of second springs with the same structure; and the two pairs of rotating shafts are a first rotating shaft and a second rotating shaft with the same structure.

[0026] The structure within the grooved plate on the front side of the first substrate is as follows: a pair of first vertical hooks are slidably disposed on the left and right sides of the vertical hook groove section of the upper pulley group; the upper pulley group is slidably disposed within the pulley groove section of the upper pulley group; the two ends of the upper pulley line of the upper pulley group pass through the upper pulley line groove section of the upper pulley group and are connected to the pair of first vertical hooks; the two ends of the lower pulley line of the upper pulley group pass through the lower pulley line groove section of the upper pulley group and are respectively fixed and connected to the connecting pulley; the first vertical hooks are located in the... The upper pulley assembly moves up and down within the vertical hook groove section as the knife is lifted; the lower electromagnet is fixedly installed at the lower end of the electromagnet frame, and a pair of lower bit hooks are located on the left and right sides of the lower electromagnet, with the pair of lower bit hooks located inside a pair of first vertical hooks. The shaft holes of the pair of lower bit hooks are rotatably connected to corresponding points on the front side of the top partition through a pair of corresponding first rotating shafts. The rear sides of the hook tips of the pair of lower bit hooks are respectively connected to a pair of first rotating shafts. The spring is elastically connected to corresponding points on the lower left and right sides of the electromagnet frame. The intersecting magnetic pole surfaces of the lower electromagnet respectively cooperate with the two sides of the pair of lower armature hooks to form corresponding front closed magnetic circuits. Both first rotating shafts are located outside the front closed magnetic circuits, and the hook tip and magnetic pole of the lower armature hook are on the same side of the first rotating shaft. When the lower electromagnet is energized, the lower armature hook moves laterally from the dynamic magnetic gap position near the corresponding magnetic pole direction of the lower electromagnet under the attraction of the lower electromagnet. The lower armature hook is positioned to be in a closed magnetic circuit position that is in contact with the corresponding magnetic pole of the lower electromagnet and is held there. At this time, the hook tip of the lower armature hook does not contact the hook tip of the first vertical hook and is in a disengaged state. When the lower electromagnet is not energized, the lower armature hook moves laterally from the position of the closed magnetic circuit that is in contact with the corresponding magnetic pole of the lower electromagnet to a dynamic magnetic gap position close to the direction of the corresponding magnetic pole of the lower electromagnet under the action of the first spring. At this time, the hook tip of the lower armature hook hooks the hook tip of the first vertical hook in a lifting manner and is in a hooked state.

[0027] The structure within the grooved plate on the back of the first substrate is as follows: a pair of second vertical hooks are slidably disposed on the left and right sides of the vertical hook groove section of the lower sliding wheel assembly. The lower sliding wheel assembly is slidably disposed within the pulley groove section of the lower sliding wheel assembly. The two ends of the upper pulley line of the lower sliding wheel assembly pass through the upper pulley line groove section of the lower sliding wheel assembly and are connected to the pair of second vertical hooks. The two ends of the lower sliding wheel line of the lower sliding wheel assembly pass through the lower sliding wheel line groove section of the lower sliding wheel assembly and are respectively connected to the first line connector and the connecting pulley. The second vertical hooks move up and down within the vertical hook groove section of the lower sliding wheel assembly as the knife is lifted, causing the lower sliding wheel assembly to move up and down within the pulley groove section of the lower sliding wheel assembly. The upper electromagnet is fixedly installed on the upper end of the electromagnet frame. A pair of upper armature hooks are located on the left and right sides of the upper electromagnet, and the pair of upper armature hooks are located inside the pair of second vertical hooks. The shaft holes of the pair of upper armature hooks are rotatably connected to corresponding points on the rear side of the top partition through a pair of corresponding second rotating shafts. The rear sides of the hook tips of the pair of upper armature hooks are respectively connected through a pair of second rotating shafts. The second spring is elastically connected to corresponding points on the upper left and right sides of the electromagnet frame. The intersecting magnetic pole surfaces of the upper electromagnet respectively cooperate with the two sides of the pair of upper armature hooks to form corresponding closed magnetic circuits on the back side. Both second rotating shafts are located outside the closed magnetic circuits on the back side, and the hook tip and magnetic pole of the upper armature hook are on the same side of the second rotating shaft. When the upper electromagnet is energized, the upper armature hook moves laterally from the dynamic magnetic gap position near the corresponding magnetic pole direction of the upper electromagnet under the attraction of the upper electromagnet. The upper armature hook moves to the closed magnetic circuit position on the back side, which is in contact with the corresponding magnetic pole of the upper electromagnet and remains there. At this time, the hook tip of the upper armature hook does not contact the hook tip of the second vertical hook and is in a disengaged state. When the upper electromagnet is not energized, the upper armature hook moves laterally from the closed magnetic circuit position on the back side, which is in contact with the corresponding magnetic pole of the upper electromagnet, to the dynamic magnetic gap position, which is close to the direction of the corresponding magnetic pole of the upper electromagnet, under the action of the second spring. At this time, the hook tip of the upper armature hook hooks the hook tip of the second vertical hook in a lifting manner and is in a hooked state.

[0028] Furthermore, the vertical hook includes a rod-shaped body. A side ear for engaging with the blade edge is located at the middle of the outer side of the rod-shaped body. A top hook is located 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 located at the upper edge of the inner side of the rod-shaped body, below the top hook. This protruding edge, when the vertical hook moves upward, laterally pushes the corresponding armature hook from a static magnetic gap position away from the electromagnet to a dynamic magnetic gap position closer to the electromagnet and holds it in the dynamic magnetic gap position. 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 push 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 push 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 fitting into the corresponding groove of the first substrate 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. At least one damping groove is provided between the side ear and the rod-shaped body to block the vibration of the knife lifting.

[0029] 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 straight rod portion has a rectangular cross-section. 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. The hook tip portion and the magnetic pole surface attracting contact portion are both on the same side of the corresponding rotating shaft.

[0030] 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.

[0031] After the armature hook is assembled with the electromagnet, 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. 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.

[0032] Furthermore, the lifting pulley assembly includes two mounting plates, two movable pulleys, two ball bearings, two movable pulley shafts, a bracket pressing protrusion, and a bracket pressing hole; the two movable pulleys are respectively mounted on the upper and lower ends of the pulley bracket formed by the two mounting plates through their respective sets of ball bearings and movable pulley shafts; and the two movable pulleys are respectively equipped with upper pulley lines and lower pulley lines of appropriate thickness; the width of both mounting plates is smaller than the diameter of the movable pulleys; the thickness of the two mounting plates is equal, serving as positioning sliders when the lifting pulley assembly moves on the front or back groove plate of the first substrate.

[0033] 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.

[0034] Furthermore, a heat sink is provided on the top partition of the second substrate for dissipating heat from the coil of the electromagnet and also for electromagnetic shielding. The heat sink is attached to the side of the top partition of the second substrate near the electromagnet, and its position corresponds to the position of the electromagnet. The heat sink is made of a non-magnetic metal material including copper, aluminum, or copper-aluminum alloy, which also has electromagnetic shielding function. At least one side of the heat sink is exposed and in good contact with the metal body to conduct heat and electricity to the outside. Adjacent heat sinks are also in good contact with each other to maintain heat and electricity conduction.

[0035] A compact three-position needle selection device assembly is an eight-pin compact three-position needle selection device assembly formed by stacking four of the above-mentioned compact three-position needle selection devices.

[0036] It should be noted that the technical solution of the present invention is not limited to manufacturing an 8-pin compact three-position needle selection device assembly, but can also be used to manufacture a higher density compact three-position needle selection device assembly.

[0037] An electronic jacquard machine equipped with the aforementioned compact three-position needle selection device assembly.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] This invention optimizes and improves the groove shape on both sides of the substrate, enabling the installation of two sets of stacked lifting pulley assemblies on both sides of the substrate while maintaining the existing pulley assembly thickness, thus increasing the installation density of the lifting pulley assemblies. Furthermore, compared to existing open-type jacquard machine pulley assemblies, the double-layer grooved plate of this invention, formed by combining the first and second substrates, has a compact structure, good sealing performance, minimizes the impact of lint and dust on the lifting pulley assemblies, has a longer service life, and is easy to install and maintain, making it suitable for mass production.

[0040] This invention adds an inclined connecting pulley to the bottom of the first substrate, and connects the lower pulley lines of the upper and lower sets of lifting pulleys in series after smoothly routing them along the lower edge of the connecting pulleys in a forward or reverse oblique direction. This allows for the following working positions: when both needles in the upper and lower sets of lifting pulleys are in a high position, the first thread output is also in a high position (first working position); when one needle in each set is in a low position and the other is in a high position, the first thread output drops one stroke (second working position); and when both needles in both sets are in a low position, the first thread output drops two strokes (third working position). By stacking four sets of the needle selection device units of this invention, an 8-needle three-position assembly can be implemented corresponding to a 4×3.5cm area. 2 The projected area is currently the highest needle density component in double-shuttle carpet jacquard machines.

[0041] 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.

[0042] 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.

[0043] 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

[0044] 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:

[0045] Figure 1 This is an exploded view of one embodiment of the compact three-position needle selection device of the present invention;

[0046] Figure 2 This is an exploded view of another embodiment of the compact three-position needle selection device of the present invention;

[0047] Figure 3 This is a schematic diagram of the front magnetic circuit structure and the vertical hook structure of the compact three-position needle selection device of the present invention;

[0048] Figure 4 This is a schematic diagram of the back magnetic circuit structure and the vertical hook of the compact three-position needle selection device of the present invention;

[0049] Figure 5 This is a schematic diagram of the structure of the I-beam core and armature hook of the compact three-position needle selection device of the present invention when forming a closed magnetic circuit;

[0050] Figure 6This is a schematic diagram of the structure of the compact three-position needle selection device of the present invention after the dual electromagnets and the electromagnet frame are assembled.

[0051] Figure 7 This is a structural diagram of a vertical hook embodiment in the compact three-position needle selection device of the present invention;

[0052] Figure 8 This is a structural diagram of another vertical hook embodiment in the compact three-position needle selection device of the present invention;

[0053] Figure 9 This is a perspective view of the lifting pulley block in the compact three-position needle selection device of the present invention;

[0054] Figure 10 This is an exploded view of the lifting pulley block in the compact three-position needle selection device of the present invention;

[0055] Figure 11 This is a schematic diagram of the structure of an embodiment of the single pulley type 1 extension piece of the compact three-position needle selection device of the present invention;

[0056] Figure 12 This is a schematic diagram of the structure of an embodiment of the single pulley type 2 extension piece of the compact three-position needle selection device of the present invention;

[0057] Figure 13 This is a schematic diagram of the structure of an embodiment of the double pulley type 1 extension piece of the compact three-position needle selection device of the present invention;

[0058] Figure 14 This is a schematic diagram of the structure of an embodiment of the double pulley type 2 extension plate of the compact three-position needle selection device of the present invention;

[0059] Figure 15 This is a schematic diagram illustrating the working principle of the first-line three-position needle selection device of the present invention;

[0060] Figure 16 This is a perspective view of the compact three-position needle selection device assembly of the present invention. Detailed Implementation

[0061] 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.

[0062] See Figure 1 and Figure 2As shown, a compact three-position needle selection device mainly includes a first substrate 1 and a second substrate 2 assembled together, two pairs of identical vertical hooks and two sets of identical lifting pulleys disposed on the front and back slot plates of the first substrate 1, two sets of upper and lower electromagnets and two pairs of upper and lower armature hooks disposed on the top partition of the first substrate 1, a connecting pulley 15 disposed on the bottom extension plate 10 of the first substrate 1, and a heat sink 16 disposed on the top partition of the second substrate 2.

[0063] See Figure 1 and Figure 2 As shown, the front groove plate of the first substrate 1 has four functional segments arranged from top to bottom: a fully linear upper pulley group vertical hook groove segment, an upper pulley group upper pulley line groove segment, an upper pulley group pulley groove segment, and an upper pulley group lower pulley line groove segment. The back groove plate of the first substrate 1 also has four functional segments arranged from top to bottom: a fully linear lower pulley group vertical hook groove segment, a lower pulley group upper pulley line groove segment, a lower pulley group pulley groove segment, and a lower pulley group lower pulley line groove segment.

[0064] The vertical hook groove section of the upper pulley group corresponds to the vertical hook groove section of the lower pulley group in terms of position and thickness. The pulley groove section of the upper pulley group corresponds to the upper pulley groove section of the lower pulley group in terms of position. The thickest pulley support section of the upper pulley groove section is located at the center of the first substrate 1, while the upper pulley groove section of the lower pulley group is located on both sides of the first substrate 1, allowing for spatial nesting without conflict. The lower pulley groove section of the upper pulley group corresponds to the lower pulley groove section in terms of position, and its location on both sides of the first substrate 1 does not conflict with the pulley support section of the lower pulley groove section located at the center of the first substrate 1. The upper pulley group pulley groove section and the lower pulley group pulley groove section are designed to be stacked in a staggered manner on both sides, and the upper pulley group pulley groove section and the lower pulley group pulley groove section have the same thickness, providing space for the subsequent staggered installation of the upper pulley group and the lower pulley group.

[0065] The front of the second substrate 2 is designed with a groove that matches the vertical hook groove of the lower pulley group, the upper pulley groove of the lower pulley group, the pulley groove of the lower pulley group, and the lower pulley groove of the lower pulley group on the back of the first substrate 1. The back of the second substrate 2 is designed with a groove that matches the vertical hook groove of the upper pulley group, the upper pulley groove of the upper pulley group, the pulley groove of the upper pulley group, and the lower pulley groove of the upper pulley group on the front of the first substrate 1.

[0066] Both the first substrate 1 and the second substrate 2 are plastic parts formed by injection molding in one step. The first substrate 1 and the second substrate 2 are provided with buckles on their front and back sides respectively. The front side of each second substrate 2 is spliced ​​with the back side of its respective first substrate 1 through the corresponding buckle. The back side of each first substrate 1 is spliced ​​with the back side of the second substrate 2 to which the adjacent first substrate 1 belongs through the corresponding buckle.

[0067] Furthermore, the lower side end face of the first substrate 1 and the lower side end face of the second substrate 2 are respectively provided with positioning notches for judging whether the two are correctly assembled. When the first substrate 1 and the second substrate 2 are both assembled with the correct side groove shape facing each other, the positioning notch on the first substrate 1 and the positioning notch on the second substrate 2 fit together left and right.

[0068] Through the above-disclosed concave-convex structure design of the first substrate 1 and the cooperation of the two second substrates 2, the two sets of lifting pulleys are stacked in a staggered manner on the front and back sides of the first substrate 1. Thus, without increasing the width and thickness of the substrate, two needle selection units can be accommodated in one substrate. That is, the two needle selection units only occupy the same width (35mm) and thickness (5mm) as the original needle selection unit.

[0069] See Figure 1 and Figure 2 As shown, two electromagnets are stacked vertically on the top partition of the first substrate 1 via an electromagnet frame 9, and each electromagnet has two intersecting magnetic pole surfaces. A pair of armature hooks are respectively provided on the left and right sides of the two electromagnets for engaging with a pair of vertical hooks on the same side. The 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 corresponding rotating shafts on the front and back surfaces of the partition. 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 via springs. When the two electromagnets are energized, their intersecting magnetic pole surfaces can engage with 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.

[0070] See Figure 1 and Figure 2As shown, a pair of identical vertical hooks are respectively provided in the vertical hook groove section of the upper pulley group and the vertical hook groove section of the lower pulley group. A set of identical lifting pulley groups is also provided in the pulley groove section of both the upper and lower pulley groups, and the two sets of lifting pulley groups are stacked in a staggered manner on the front and back sides of the first substrate. The two ends of the upper pulley lines of the upper and lower sets of lifting pulley groups are respectively connected to the front and rear pairs of vertical hooks, and the two pairs of vertical hooks drive their respective sets of lifting pulley groups to slide up and down via the upper pulley lines.

[0071] See Figure 1 and Figure 2 As shown, the bottom of the first substrate 1 is provided with one or two connecting pulleys 15 with ball bearings via an extension piece 10. One end of the lower pulley line of the upper and lower sets of lifting pulleys is smoothly connected after passing through the lower edge of the connecting pulley 15 in a forward or reverse diagonal manner, forming a three-position head line shared by the two lifting pulley sets. The remaining end of the lower pulley line of the upper and lower sets of lifting pulleys is connected to their respective head line connectors.

[0072] See Figure 1 and Figure 2 As shown, a heat sink 16 is provided on the top partition of the second substrate 2 to dissipate heat from the electromagnet coil and also to provide electromagnetic shielding. The electromagnet coil of the needle selection device is a heat-generating element. During long-term continuous operation, the temperature at the center of the coil is very high, which may even damage the insulation layer of the enameled wire, causing the coil to short-circuit and burn out. 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 16 is attached to the side of the top partition of the second substrate 2 near the electromagnet, and its position corresponds to the position of the electromagnet, so that the heat sink 16 is in close contact with the electromagnet coil and can conduct heat away. The heat sink 16 is made of a non-magnetic metal material that also provides electromagnetic shielding, such as copper, aluminum, or other alloys. While conducting heat, it can also provide magnetic and electrical shielding, playing a role in resisting electromagnetic interference. At least one side of the heat sink 16 is exposed and in good contact with the metal body to conduct heat and electricity to the outside, and adjacent heat sinks 16 are also in good contact with each other to maintain heat and electricity conduction.

[0073] See Figure 1 and Figure 2As shown, 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 lifting pulley groups are an upper pulley group 7a and a lower pulley group 7b with the same structure; the two electromagnets stacked on top of each other are an upper electromagnet 3b and a lower electromagnet 3a with symmetrical structure; the two pairs of armature hooks are an upper armature hook 4b and a lower armature hook 4a with different structures; the two pairs of springs are a pair of first springs 5a and a pair of second springs 5b with the same structure; and the two pairs of rotating shafts are a first rotating shaft 8a and a second rotating shaft 8b with the same structure.

[0074] Because of the concave and convex groove design on both sides of the first substrate 1, two sets of pulley groups with identical structures, namely the upper pulley group 7a and the lower pulley group 7b, can be accommodated simultaneously without increasing the thickness of the groove plate. Also, because of the symmetrical design of the upper electromagnet 3b and the lower electromagnet 3a, and the different hook designs of the upper hook 4b and the lower hook 4a, two pairs of vertical hooks of the same shape can be used in the vertical hook groove section of the upper pulley group and the vertical hook groove section of the lower pulley group, namely a pair of first vertical hooks 6a and a pair of second vertical hooks 6b.

[0075] See Figure 3 As shown, the structure within the grooved plate on the front of the first substrate is as follows: a pair of first vertical hooks 6a are slidably disposed on the left and right sides of the vertical hook groove section of the upper pulley group; the upper pulley group 7a is slidably disposed within the pulley groove section of the upper pulley group; the two ends of the upper pulley line of the upper pulley group 7a pass through the upper pulley line groove section of the upper pulley group and are connected to the pair of first vertical hooks 6a; the two ends of the lower pulley line of the upper pulley group 7a pass through the lower pulley line groove section of the upper pulley group and are respectively fixed and connected to the connecting pulley 15; the first vertical hooks 6a move up and down within the vertical hook groove section of the upper pulley group as the knife is lifted, causing the upper pulley group 7a to move up and down within the pulley groove section of the upper pulley group; the lower electromagnet 3a is fixedly installed at the lower end of the electromagnet frame 9. A pair of lower armature hooks 4a are located on the left and right sides of the lower electromagnet 3a, and the pair of lower armature hooks 4a are located inside the pair of first vertical hooks 6a. The shaft holes of the pair of lower armature hooks 4a are rotatably connected to the corresponding points on the front side of the top partition through a pair of first rotating shafts 8a. The rear sides of the hook tips of the pair of lower armature hooks 4a are elastically connected to the corresponding points on the left and right sides of the lower part of the electromagnet frame 9 through a pair of first springs 5a. The intersecting magnetic pole surfaces of the lower electromagnet 3a cooperate with the two sides of the pair of lower armature hooks 4a to form corresponding front closed magnetic circuits. Both first rotating shafts 8a are located outside the front closed magnetic circuits, and the hook tips and magnetic poles of the lower armature hooks 4a are on the same side of the first rotating shafts 8a.

[0076] When the lower electromagnet 3a is energized, the lower armature hook 4a is held in a closed magnetic circuit position, in contact with the corresponding magnetic pole of the lower electromagnet 3a, under the attraction of the lower electromagnet 3a. At this time, the hook tip of the lower armature hook 4a is not in contact with 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, that is, it moves laterally from the closed magnetic circuit position in contact with the corresponding magnetic pole of the lower electromagnet 3a to a dynamic magnetic gap position close to the corresponding magnetic pole of the lower electromagnet 3a. At this time, 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.

[0077] See Figure 4 As shown, the structure within the grooved plate on the back of the first substrate is as follows: a pair of second vertical hooks 6b are slidably disposed on the left and right sides of the vertical hook groove section of the lower sliding wheel assembly, and the lower sliding wheel assembly 7b is slidably disposed within the pulley groove section of the lower sliding wheel assembly. The two ends of the upper pulley line of the lower sliding wheel assembly 7b pass through the upper pulley line groove section of the lower sliding wheel assembly and are connected to the pair of second vertical hooks 6b. The two ends of the lower sliding wheel line of the lower sliding wheel assembly 7b pass through the lower sliding wheel line groove section of the lower sliding wheel assembly and are connected to the first line connector 20 and the connecting pulley 15, respectively. The second vertical hooks 6b move up and down within the vertical hook groove section of the lower sliding wheel assembly as the knife is lifted, causing the lower sliding wheel assembly 7b to move up and down within the pulley groove section of the lower sliding wheel assembly. The upper electromagnet 3b is fixedly installed on the electromagnet frame 9. At the upper end, a pair of upper armature hooks 4b are located on the left and right sides of the upper electromagnet 3b, and the pair of upper armature hooks 4b are located inside the pair of second vertical hooks 6b. The shaft holes of the pair of upper armature hooks 4b are rotatably connected to the corresponding points on the rear side of the top partition through a pair of corresponding second rotating shafts 8b. The rear sides of the hook tips of the pair of upper armature hooks 4b are elastically connected to the corresponding points on the left and right sides of the upper part of the electromagnet frame 9 through a pair of second springs 5b. The intersecting magnetic pole surfaces of the upper electromagnet 3b cooperate with the two sides of the pair of upper armature hooks 4b to form corresponding closed magnetic circuits on the back side. Both second rotating shafts 8b are located outside the closed magnetic circuits on the back side, and the hook tips and magnetic poles of the upper armature hooks 4b are on the same side of the second rotating shafts 8b.

[0078] When the upper electromagnet 3b is energized, the upper armature hook 4b, attracted by the upper electromagnet 3b, remains in a closed magnetic circuit position on the back side, where it is in contact with the corresponding magnetic pole of the upper electromagnet 3b. At this time, 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, that is, it moves laterally from the closed magnetic circuit position on the back side, where it is in contact with the corresponding magnetic pole of the upper electromagnet 3b, to a dynamic magnetic gap position close to the direction of the corresponding magnetic pole of the upper electromagnet 3b. At this time, the hook tip of the upper armature hook 4b hooks the hook tip of the second vertical hook 6b in a lifting manner, and is in a hooked state.

[0079] See Figure 3 As shown, the front magnetic circuit structure of the present invention consists of a lower electromagnet 3a and two lower armature hooks 4a. See [reference needed]. Figure 4 As shown, the back magnetic circuit structure of the present invention consists of an upper electromagnet 3b and two upper armature hooks 4b.

[0080] See Figure 5 As shown, the lower electromagnet 3a and the upper electromagnet 3b have the same structure, both consisting of an I-beam core 301 with enameled wire wound around it. 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 upper electromagnet 3b is on top, and the short magnetic pole 303 is on the bottom, while the long magnetic pole 302 of the lower electromagnet 3a is on the bottom, and the short magnetic pole 303 is on top. Figure 5 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.

[0081] The concave surface of the first bend serves as the sliding magnetic pole surface 304, and the side end face of the second bend serves as the attracting magnetic pole surface 305. The sliding magnetic pole surface 304 and the attracting magnetic pole surface 305, located on the same side, constitute two intersecting magnetic pole surfaces. A magnetically conductive plastic cover 306 is provided in front of the sliding magnetic pole surface 304. There is a gap between the magnetically conductive plastic cover 306 and the sliding magnetic pole surface 304 to form a groove that facilitates the insertion of the straight rod portion 401. A magnetically conductive elastic element 307 for contacting the straight rod portion 401 is provided in the groove.

[0082] See Figure 5As shown, the lower armature hook 4a and the upper armature hook 4b have largely the same structure, both including 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 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 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 hook tip portion 403 and the magnetic pole surface attracting contact portion 405 are both on the same side of the corresponding rotating shaft.

[0083] See Figure 3 and Figure 4 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.

[0084] See Figure 6 As shown, the top of the electromagnet frame 9 is provided with a printed circuit board slot 19, and metal springs 11 for connecting the coil leads of the electromagnet are provided on both sides of the printed circuit board slot 19. 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.

[0085] The partition plate is provided with limiting protrusions on both sides to prevent the armature hook from moving excessively laterally outward under the action of the spring, and the limiting protrusions do not interfere with the movement of the vertical hook in the vertical hook groove section of the upper pulley group and the vertical hook groove section of the lower pulley group.

[0086] See Figure 3 and Figure 4As shown, during assembly, the shaft hole 402 of the upper hook 4b of the lower hook 4a is 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 hook 4a, and the other end is connected to the first spring mounting hole 13 on the electromagnet frame 9. One end of the second spring 5b is fixed on the spring positioning post 406 of the upper hook 4b, and the other end is connected to the second spring mounting hole 14 on the electromagnet frame 9.

[0087] See Figure 5 As shown, after assembly, the sliding contact portion 404 of the magnetic pole surface of the upper hook 4b of the lower hook 4a 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. The magnetic pole surface attraction contact portion 405 is laterally aligned with the attraction magnetic pole surface 305. When the magnetic pole surface attraction contact portion 405 is in contact with the attraction magnetic pole surface 305, three sides of the 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, so that the sliding magnetic pole surface 304, the sliding contact portion 404, 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 conduction path of the closed magnetic circuit.

[0088] See Figure 1 and Figure 2 As shown, a pair of first vertical hooks 6a are slidably disposed in the vertical hook groove section of the upper pulley group, and a pair of second vertical hooks 6b are slidably disposed in the vertical hook groove section of the lower pulley group.

[0089] See Figure 7 and Figure 8 As shown, the first vertical hook 6a and the second vertical hook 6b have the same structure, both including a rod-shaped body 601. The middle 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. The top 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.

[0090] A raised edge is provided on the upper edge of the inner side of the rod-shaped body 601, below the top hook portion 603. This raised edge, when the vertical hook moves upward, laterally pushes the corresponding armature hook from a static magnetic gap position away from the electromagnet to a dynamic magnetic gap position closer to the electromagnet and maintains it in the dynamic magnetic gap position. The raised edge protrudes laterally from the hook tip of the top hook portion 603. The contour curve of the raised edge is divided into a pushing section 604a in the upper section and a holding section 604b in the lower section. 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 can generate an outward lateral thrust 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 can apply a holding force to the armature hook that has undergone lateral displacement.

[0091] 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 7 As shown, Figure 7 The C in the figure represents the unhooking allowance. Due to the existence of the unhooking allowance C, 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.

[0092] 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.

[0093] 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.

[0094] The inner middle and lower parts of the rod-shaped body 601 are provided with a limiting protrusion 605 along its edge for fitting into the corresponding groove of the first substrate and ensuring that the vertical hook does not undergo lateral displacement. The top end of the limiting protrusion 605 is parallel to the bottom end of the protrusion retaining section 604b. Since the vertical hook is set in the upper pulley group vertical hook groove section and the upper pulley group vertical hook groove section of the first substrate 1, the vertical hook needs to have a matching rod-shaped body 601 to ensure that the vertical hook does not undergo lateral displacement when it moves up and down within the upper pulley group vertical hook groove section and the upper pulley group vertical hook groove section. 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 is moving up and down; otherwise, the size of the dynamic magnetic gap cannot be controlled.

[0095] 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 7 The single-slot design shown can also be designed as follows: Figure 8 The dual-slot design is shown.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] from Figure 5 As can be 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 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 of rotation at a certain angle, thus maintaining a low magnetic resistance magnetic circuit connection.

[0100] from Figure 5 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.

[0101] 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.

[0102] 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).

[0103] See Figure 3 As shown, it can be clearly seen that the right side of the front magnetic circuit structure is in a disengaged state. The lower armature hook 4a on the right side is pushed towards the short magnetic pole on the right side of the lower electromagnet 3a by the protruding edge of the first vertical hook 6a on the right side, i.e., the dynamic magnetic gap position, which is a very small magnetic gap. 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 coil of the lower electromagnet 3a, when energized, will generate a relatively large electromagnetic force, attracting the lower armature hook 4a on the right side 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 side is compressed. As long as the coil of the lower electromagnet 3a is energized at this time, the attraction force of the lower electromagnet 3a is greater than the elastic force of the first spring 5a on the right side. Therefore, when the first vertical hook 6a on the right side moves down, even without the action of the protruding edge on the first vertical hook 6a on the right side, the lower armature hook 4a on the right side will be attracted into the closed magnetic circuit position by electromagnetic force and remain there. When the first vertical hook 6a on the right continues to descend until its hook tip aligns with the hook tip of the lower bit hook 4a on the right, the presence 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.

[0104] 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.

[0105] See Figure 3 As shown, it can be clearly seen that the left side of the front magnetic circuit structure is in a hook state. Under the action of the first spring 5a on the left side, the lower armature hook 4a is pushed away from the short magnetic pole position on the left side of the lower electromagnet 3a, i.e., the static magnetic gap 18 position, and hooks the first vertical hook 6a on the left side, forming a fairly large static magnetic gap 18. The lateral displacement of the lower armature hook 4a on the left side is actually a rotation around the corresponding pivot. In this embodiment, the pivot is located below the lower electromagnet 3a. The vertical hook groove section of the upper pulley group engages with the protruding edges on the rods of the two first vertical hooks 6a, ensuring that the first vertical hooks 6a do not have lateral displacement when moving up and down.

[0106] See Figure 4 As shown, it can be clearly seen that the right side of the magnetic circuit structure on the back 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, which is 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 pulled 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.

[0107] See Figure 4As shown, it can be clearly seen that the left side of the magnetic circuit structure on the back is in a hook 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 side. 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 vertically. In such cases, traditional 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.

[0108] See Figure 1 and Figure 2 As shown, the upper pulley assembly 7a is slidably disposed within the pulley groove section of the upper pulley assembly, and the lower pulley assembly 7b is slidably disposed within the pulley groove section of the lower pulley assembly. The upper pulley assembly 7a and the lower pulley assembly 7b are stacked in a staggered manner on opposite sides of the first substrate. The two ends of the upper pulley line of the upper pulley assembly 7a are respectively connected to the bottom ends of a pair of first vertical hooks 6a. These first vertical hooks 6a drive the upper pulley assembly 7a to slide up and down within the pulley groove section of the upper pulley assembly via the upper pulley line. The two ends of the upper pulley line of the lower pulley assembly 7b are respectively connected to the bottom ends of a pair of second vertical hooks 6b. These second vertical hooks 6b drive the lower pulley assembly 7b to slide up and down within the pulley groove section of the upper pulley assembly via the upper pulley line.

[0109] join Figure 9 As shown, the upper pulley assembly 7a and the lower pulley assembly 7b have the same structure, each including two mounting plates 701, two movable pulleys 702, two ball bearings 703, two movable pulley shafts 704, a bracket pressing protrusion 705, and a bracket pressing hole 706. The two movable pulleys 702 are respectively set at the upper and lower ends of the pulley bracket formed by the two mounting plates 701 through their respective sets of ball bearings 703 and movable pulley shafts 704. The two movable pulleys 702 are respectively equipped with upper pulley lines and lower pulley lines of appropriate thickness. The width of the two mounting plates 701 is smaller than the diameter of the movable pulleys 702. The thickness of the two mounting plates 701 is equal, so as to serve as positioning sliders when the lifting pulley assembly moves on the front or back groove plate of the first substrate 1.

[0110] Both the mounting plate 701 and the movable pulley shaft 704 are made of plastic and can be pressed together at high temperatures, making the entire support of the lifting pulley assembly a stable whole. The ball bearing 703 enables the lifting pulley assembly to bear a large load.

[0111] Lifting pulley block: This refers to a movable pulley block consisting of upper and lower pulleys. In the needle selection unit, the lifting pulley block primarily shortens the stroke; that is, the stroke of the lifting pulley block is half the needle lifting stroke. Essentially, the upper pulley of the lifting pulley block "stores" half the needle lifting stroke, which is then released through the lower pulley. Three-position / multi-position systems utilize this principle. The upper pulley lines are connected in parallel, while the lower pulley lines are connected in series. The lower pulley lines can release the stroke "stored" by multiple upper pulleys.

[0112] Pulley line: The line acting on the pulley. There are two sections of pulley line: the one acting on the upper pulley is called the upper pulley line, and the one acting on the lower pulley is called the lower pulley line. Typically, in a lifting pulley system, the upper pulley line is the driving side, and the lower pulley line is the output side, connecting to the load. In this invention, the vertical hook connected to the end of the upper pulley line is driven by the lifting knife. One end of the lower pulley line is fixed, and the other end is the "head line," connecting the warp yarn and heddle yarn, controlling the up-and-down movement of the warp yarn, and is the load.

[0113] Lifting pulley blocks can be equipped with either ball bearings or sliding bearings. In current pulley block structures, ball bearings offer significantly better load-bearing capacity than sliding bearings. However, ball bearings are limited by the size of the balls and the bearing support, making it difficult to reduce their thickness. Furthermore, the pulley groove itself is thin, and its space occupied by the groove is also limited. This invention addresses this by symmetrically arranging thicker pulley components with thinner pulley grooves, and by stacking the two thicker pulley components vertically in a staggered manner. This achieves a high-density arrangement of the thicker ball bearing pulley block, making it well-suited for high-speed, high-load applications.

[0114] 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.

[0115] The connecting pulley 15 is installed in the interlayer of the extension piece 10 at an angle to the left or right, so as to bridge the upper and lower sets of the lifting pulley groups, so that the lower pulley lines of the front and rear sets of the lifting pulley groups can smoothly enter the lower edge of the connecting pulley 15 from both sides and connect to form a lower pulley line shared by the front and rear sets of the lifting pulley groups.

[0116] The inclination direction of the connecting pulley 15 is determined by the inclination direction of the connecting pulley mounting surface within the interlayer of the extension piece 10.

[0117] See Figure 10 As shown, when the mounting surface of the connecting pulley is tilted to the right, the extension piece 10 is a type 1 extension piece with a Z-shaped longitudinal section, and at this time, the connecting pulley 15 is tilted to the right. See also Figure 1 As shown, when the connecting pulley 15 is tilted to the right, the left end 21a of the lower pulley line of the upper pulley group and the right end 22b of the lower pulley line of the lower pulley group are smoothly connected at the lower edge of the connecting pulley 15, that is, connected in a diagonal manner, thereby forming the first needle selection device unit.

[0118] See Figure 11 As shown, when the connecting pulley's mounting surface is tilted to the left, the extension piece 10 is a type 2 extension piece with a reverse Z-shaped longitudinal section, and at this time, the connecting pulley 15 tilts to the left. See also Figure 2 As shown, when the connecting pulley 15 is tilted to the left, the right end 21b of the lower pulley line of the upper pulley group and the left end 22a of the lower pulley line of the lower pulley group are smoothly connected to the lower edge of the connecting pulley 15, that is, connected in a reverse oblique line manner, thereby forming the second needle selection device unit.

[0119] The difference between the second needle selection device unit and the first needle selection device unit is that different types of extension strips are used. As a result, the first thread exit positions of the sliding rollers of the two are staggered. When multiple first needle selection device units and second needle selection device units are combined into an assembly, staggered first thread exit positions are obtained.

[0120] See Figure 13 and Figure 14 As shown, two connecting pulleys 15 can also be provided on the type 1 extension piece and the type 2 extension piece, so that the stress of the first line at the three positions can be distributed to both sides of the first substrate 1, avoiding the situation where the jacquard stress is concentrated on the central axis of the first substrate 1, which is conducive to the long-term stable operation of the first substrate 1.

[0121] It should be noted that the actual extension piece 10 consists of two pieces, front and rear, clamping and fixing the pulley. Figure 1 , Figure 2 , Figure 11 , Figure 12 , Figure 13 and Figure 14 To allow the view of the central connecting pulley 15 and its tilt, the front panel has been obscured.

[0122] This invention connects the lower pulley lines of the two sets of lifting pulleys in series via connecting pulley 15, forming a shared lower pulley line for both sets of lifting pulleys, thereby enabling first-line output at three positions. See also Figure 15 As shown, with Figure 15 For example, from left to right in the image are:

[0123] When both first vertical hooks 6a and both second vertical hooks 6b are in the high position U, the upper pulley group 7a and the lower pulley group 7b drive the first line connector to the high position through the shared lower pulley line. At this time, the first line output position is in the first working position P1.

[0124] When the first vertical hook 6a and both second vertical hooks 6b on the left are in the high position (U), and the first vertical hook 6a on the right is in the low position (D), the upper pulley group 7a and the lower pulley group 7b drive the first wire connector to the middle position through the shared lower pulley line. At this time, the first wire output position is in the second working position P2. The difference in height between the second working position P2 and the first working position P1 is one opening stroke.

[0125] When the first vertical hook 6a and the second vertical hook 6b on the left are both in the high position (U), and the first vertical hook 6a and the second vertical hook 6b on the right are both in the low position (D), the upper pulley group 7a and the lower pulley group 7b drive the first line connector to the low position through the shared lower pulley line. At this time, the first line output position is in the third working position P3. The difference in height between the third working position P3 and the second working position P2 is one opening stroke, and the difference in height between the third working position P3 and the first working position P1 is two opening strokes.

[0126] Therefore, when the lower pulley lines of the upper pulley system 7a and the lower pulley system 7b are connected in series, the following effect can be achieved:

[0127] When the lifting pins of both the upper pulley block 7a and the lower pulley block 7b are in the high position, the first line output is also in the high position, which is the first working position P1;

[0128] When one of the upper pulley group 7a and the lower pulley group 7b is in a low position and the other is in a high position, the first line output drops one stroke, which is the second working position P2.

[0129] When the lifting pins of both the upper pulley block 7a and the lower pulley block 7b are in the low position, the first line output drops two strokes, which is the third working position P3.

[0130] See Figure 16 As shown, based on the above-mentioned needle selection device unit, the present invention can also be used to manufacture an 8-needle compact three-position needle selection device assembly consisting of four of the above-mentioned compact three-position needle selection devices stacked together.

[0131] It should be noted that the technical solution of the present invention is not limited to manufacturing an 8-pin compact three-position needle selection device assembly, but can also be used to manufacture a higher density compact three-position needle selection device assembly.

[0132] The present invention can also be used to manufacture an electronic jacquard machine equipped with the above-described compact three-position needle selection device assembly.

[0133] 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 compact three-position needle selection device, characterized in that: The first substrate (1) and the second substrate (2) are assembled together. A pair of vertical hooks and a set of lifting pulleys are slidably provided on the front and back groove plates of the first substrate (1). The two sets of lifting pulleys are stacked in a staggered manner through the concave and convex design structure of the first substrate (1). The two pairs of vertical hooks drive the two sets of lifting pulleys to slide up and down through the corresponding upper pulley lines. Two electromagnets are stacked on the partition plate at the top of the first substrate (1) through the electromagnet skeleton (9). The two electromagnets have two intersecting magnetic pole surfaces and can cooperate with their respective pair of armature hooks to form a closed magnetic circuit. The two pairs of armature hooks are located on the left and right sides of the two electromagnets respectively. The shaft holes of the two pairs of armature hooks are rotatably connected to the corresponding rotating shafts on the front and back surfaces of the partition plate respectively. 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 skeleton (9) through springs respectively. The bottom of the first substrate (1) is provided with one or two connecting pulleys (15) with ball bearings through an extension piece (10). One end of the sliding pulley line of the upper and lower sets of lifting pulleys is connected after passing smoothly through the lower edge of the connecting pulley (15) in a forward or reverse diagonal manner, forming a sliding pulley line shared by the two sets of lifting pulleys. One end of the shared sliding pulley line is fixed, and the other end is connected to the first line connector for output, thereby enabling the first line output at three positions, namely: When all four vertical hooks on both sides are in the high position, the first line output position is in the first working position. When one of the vertical hooks on the front and both of the vertical hooks on the back are in a high position, and the other vertical hook on the front is in a low position, the first line output position is in the second working position; the difference between the second working position and the first working position is one opening stroke. When one vertical hook on the front and one vertical hook on the back are both in a high position, and the other vertical hook on the front and the other vertical hook on the back are in a low position, the first line output position is in the third working position; the difference between the third working position and the second working position is one opening stroke, and the difference between the third working position and the first working position is two opening strokes. The vertical hook includes a rod-shaped body (601). A side ear (602) for attaching to 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). The hook is located at the upper edge of the inner side of the rod-shaped body (601) and is situated at... A raised edge is provided below the top hook portion (603). This raised edge, when the vertical hook moves upward, laterally pushes the corresponding armature hook from a static magnetic gap position away from the electromagnet to a dynamic magnetic gap position closer to the electromagnet and holds it in the dynamic magnetic gap position. The raised edge protrudes laterally from the hook tip of the top hook portion (603). The contour curve of the raised edge is divided into a pushing section (604a) in the upper section and a holding section (604b) in the lower section. The pushing section (604a) is from... The top hook portion (603) has an inclined curve starting from the hook bottom; 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; the distance from the bottom of the holding section (604b) to the hook bottom of the top hook portion (603) is greater than the distance from the hook tip of the top hook portion (603) to the hook bottom of the top hook portion (603); the length of the holding section (604b) of the convex edge corresponds to the needle selection device to which it belongs. The tolerance range for the lifting height of the jacquard machine knife; the middle and lower parts of the inner side of the rod-shaped body (601) are provided with a limiting protrusion (605) for fitting into the corresponding groove of the first substrate and ensuring that the vertical hook does not have lateral displacement, and the top end of the limiting protrusion (605) is connected in a straight line parallel to the bottom end of the protrusion retaining section (604b); at least one damping groove (606) for blocking the lifting vibration of the knife is opened between the side ear (602) and the rod-shaped body (601).

2. The compact three-position needle selection device according to claim 1, characterized in that: The connecting pulley (15) is installed in the interlayer of the extension piece (10) at an angle to the left or right so as to bridge the upper and lower sets of the lifting pulley groups, so that the lower pulley lines of the front and rear sets of the lifting pulley groups can smoothly enter the lower edge of the connecting pulley (15) from both sides and connect to form a three-position head line. The inclination direction of the connecting pulley (15) is determined by the inclination direction of the connecting pulley mounting surface within the interlayer of the extension piece (10). When the mounting surface of the connecting pulley is tilted to the right, the extension piece (10) is a type 1 extension piece with a Z-shaped structure in longitudinal section. At this time, the connecting pulley (15) is tilted to the right and is used to connect the left end of the lower pulley line of the upper pulley group with the right end of the lower pulley line of the lower pulley group, that is, the connection is in the form of a straight oblique line. When the mounting surface of the connecting pulley is tilted to the left, the extension piece (10) is a type 2 extension piece with a reverse Z-shaped structure in longitudinal section. At this time, the connecting pulley (15) is tilted to the left and is used to connect the right end of the lower pulley line of the upper pulley group with the left end of the lower pulley line of the lower pulley group, that is, to connect in a reverse oblique line manner.

3. The compact three-position needle selection device according to claim 1, characterized in that: The front groove plate of the first substrate (1) is provided with four functional sections from top to bottom: a vertical hook groove section of the upper pulley group, a line groove section of the upper pulley group, a pulley groove section of the upper pulley group, and a line groove section of the lower pulley group; the back groove plate of the first substrate (1) is provided with four functional sections from top to bottom: a vertical hook groove section of the lower pulley group, a line groove section of the upper pulley group, a pulley groove section of the lower pulley group, and a line groove section of the lower pulley group. The vertical hook groove section of the upper pulley group corresponds to the vertical hook groove section of the lower pulley group in terms of position and thickness; the pulley groove section of the upper pulley group corresponds to the upper pulley line groove section of the lower pulley group in terms of position, and the thickest pulley group support section of the upper pulley groove section is located at the center of the first substrate (1), while the upper pulley line groove section of the lower pulley group is located on both sides of the first substrate (1), so they do not conflict in space and can be nested; the upper pulley line groove section of the lower pulley group... The groove segment corresponds to the position of the sliding groove segment of the lower pulley group, and the groove segment of the upper pulley group lower pulley is located on both sides of the first substrate (1), and does not conflict with the pulley group support segment of the sliding groove segment of the lower pulley group located at the center of the first substrate (1); the sliding groove segment of the upper pulley group and the sliding groove segment of the lower pulley group are designed to be stacked in a staggered manner on the front and back sides, and the sliding groove segment of the upper pulley group and the sliding groove segment of the lower pulley group have the same thickness.

4. The compact three-position needle selection device according to claim 3, characterized in that: The two pairs of vertical hooks are a pair of first vertical hooks (6a) and a pair of second vertical hooks (6b) with identical structures; the two lifting pulley groups are an upper pulley group (7a) and a lower pulley group (7b) with identical structures; the two electromagnets stacked vertically are an upper electromagnet (3b) and a lower electromagnet (3a) with symmetrical structures; the two pairs of armature hooks are an upper armature hook (4b) and a lower armature hook (4a) 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 structure within the grooved plate on the front side of the first substrate is as follows: a pair of first vertical hooks (6a) are respectively slidably disposed on the left and right sides of the vertical hook groove section of the upper pulley group; the upper pulley group (7a) is slidably disposed on the pulley groove section of the upper pulley group; the two ends of the upper pulley line of the upper pulley group (7a) pass through the upper pulley line groove section of the upper pulley group and are connected to the pair of first vertical hooks (6a); the two ends of the lower pulley line of the upper pulley group (7a) pass through the lower pulley line groove section of the upper pulley group and are respectively fixed and connected to the connecting pulley (15); the first vertical hooks (6a) are located in the vertical hook groove section of the upper pulley group. The upper pulley group (7a) moves up and down within the upper pulley group's pulley groove section as the knife is lifted and lowered; 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), 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 rotatably connected to the corresponding points on the front side of the top partition through a pair of corresponding first rotating shafts (8a). The rear sides of the hook tips of the pair of lower bit hooks (4a) are respectively connected to a pair of first springs (5a) and The corresponding points on the lower left and right sides of the electromagnet frame (9) are elastically connected. The intersecting magnetic pole surfaces of the lower electromagnet (3a) respectively cooperate with the two sides of the pair of lower armature hooks (4a) to form corresponding front closed magnetic circuits. The two first rotating shafts (8a) are located outside the front closed magnetic circuits, and the hook tip and magnetic pole of the lower armature hook (4a) are on the same side of the first rotating shaft (8a). When the lower electromagnet (3a) is energized, the lower armature hook (4a) moves laterally from the dynamic magnetic gap position near the corresponding magnetic pole direction of the lower electromagnet (3a) to the position of the lower electromagnet (3a) under the attraction of the lower electromagnet (3a). The lower electromagnet (3a) is in a closed magnetic circuit position with its corresponding magnetic pole in contact and is maintained. At this time, 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 laterally from the closed magnetic circuit position with its corresponding magnetic pole in contact with the lower electromagnet (3a) to a dynamic magnetic gap position close to the direction of the corresponding magnetic pole of the lower electromagnet (3a) under the action of the first spring (5a). At this time, 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 structure within the grooved plate on the back of the first substrate is as follows: a pair of second vertical hooks (6b) are slidably disposed on the left and right sides of the vertical hook groove section of the lower slide wheel assembly, and the lower slide wheel assembly (7b) is slidably disposed within the pulley groove section of the lower slide wheel assembly. The two ends of the upper pulley line of the lower slide wheel assembly (7b) pass through the upper pulley line groove section of the lower slide wheel assembly and are connected to the pair of second vertical hooks (6b). The two ends of the lower slide wheel line of the lower slide wheel assembly (7b) pass through the lower slide wheel line groove section of the lower slide wheel assembly and are connected to the first line connector (20) and the connecting pulley (15) respectively. The second vertical hooks (6b) are located on the lower slide wheel assembly. The vertical hook slide section of the wheel set moves up and down with the lifting of the knife, causing the lower slide wheel set (7b) to move up and down within the slide groove section of the lower slide wheel set pulley; the upper electromagnet (3b) is fixedly installed on the upper end of the electromagnet frame (9), and a pair of upper hooks (4b) are located on the left and right sides of the upper electromagnet (3b), and the pair of upper hooks (4b) are located inside a pair of second vertical hooks (6b). The shaft holes of the pair of upper hooks (4b) are rotatably connected to the corresponding points on the rear side of the top partition through a pair of corresponding second rotating shafts (8b). The rear sides of the hook tips of the pair of upper hooks (4b) are respectively connected by a pair of second springs ( 5b) The upper electromagnet (3b) is elastically connected to the corresponding points on the left and right sides of the upper part of the electromagnet frame (9). The intersecting magnetic pole surfaces of the upper electromagnet (3b) respectively cooperate with the two sides of the pair of upper armature hooks (4b) to form corresponding closed magnetic circuits on the back side. The two second rotating shafts (8b) are located outside the closed magnetic circuits on the back side. The hook tip and magnetic pole of the upper armature hook (4b) are on the same side of the second rotating shaft (8b). When the upper electromagnet (3b) is energized, the upper armature hook (4b) moves laterally from the dynamic magnetic gap position close to the corresponding magnetic pole direction of the upper electromagnet (3b) under the attraction of the upper electromagnet (3b). The upper armature hook (4b) is positioned to be in contact with the corresponding magnetic pole of the upper electromagnet (3b) and remains in this position. At this time, 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 laterally from the position of the closed magnetic circuit on the back side that is in contact with the corresponding magnetic pole of the upper electromagnet (3b) to the dynamic magnetic gap position close to the direction of the corresponding magnetic pole of the upper electromagnet (3b) under the action of the second spring (5b). At this time, the hook tip of the upper armature hook (4b) hooks the hook tip of the second vertical hook (6b) in a lifting manner and is in a hooked state.

5. The compact three-position needle selection device according to claim 1, 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 hook tip portion (403) and the magnetic pole surface attracting contact portion (405) are both on the same side of the rotating shaft. 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.

6. The compact three-position needle selection device according to claim 1, characterized in that: The lifting pulley assembly includes two mounting plates (701), two movable pulleys (702), two ball bearings (703), two movable pulley shafts (704), a bracket pressing protrusion (705), and a bracket pressing hole (706). The two movable pulleys (702) are respectively set at the upper and lower ends of the pulley bracket formed by the two mounting plates (701) through their respective sets of ball bearings (703) and movable pulley shafts (704). The two movable pulleys (702) are respectively equipped with upper pulley lines and lower pulley lines of appropriate thickness. The width of the two mounting plates (701) is smaller than the diameter of the movable pulleys (702). The thickness of the two mounting plates (701) is equal, so as to serve as positioning sliders when the lifting pulley assembly moves on the front or back groove plate of the first substrate (1).

7. The compact three-position needle selection device according to claim 1, characterized in that: The second substrate (2) has a heat sink (16) on the top partition for dissipating heat from the coil of the electromagnet and also for electromagnetic shielding. The heat sink (16) is attached to the side of the top partition of the second substrate (2) near the electromagnet, and its position corresponds to the position of the electromagnet. The heat sink (16) is made of a non-magnetic metal material including copper, aluminum or copper-aluminum alloy, which also has electromagnetic shielding function. At least one side of the heat sink (16) is exposed and in good contact with the metal body to conduct heat and electricity to the outside. Adjacent heat sinks (16) are also in good contact with each other to maintain heat and electricity conduction.

8. A compact three-position needle selection device assembly, characterized in that: The present invention relates to an 8-pin compact three-position needle selection device assembly comprising four compact three-position needle selection devices as described in any one of claims 1-7.

9. An electronic jacquard machine, characterized in that: The electronic jacquard machine is equipped with the compact three-position needle selection device assembly as described in claim 8.

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