Needle lifting position detection mechanism of electronic jacquard machine

Abstract

The invention discloses a lifting needle position detection mechanism of an electronic jacquard machine, and belongs to the technical field of detection mechanisms, the lifting needle position detection mechanism comprises a lifting needle and a detection switch, the detection switch comprises an insulating plate and a conductive roller which is installed on one side of the insulating plate and can rotate, the bottom end of the lifting needle is connected with a harness cord, and the bottom end of the harness cord is connected with an intermittent conductive wire; when the lifting needle moves up and down, the intermittent conductor wire is driven to move up and down and make contact with the conductive roller, the conductive roller rotates through friction, on-off of the detection switch is judged according to the contact condition of the insulation part and the conductive part, and compared with a traditional scheme, the mechanism avoids the problems of high cost, inconvenient installation and overheating of a photoelectric sensor; compared with a sliding contact detection mechanism, abrasion is greatly reduced through rolling contact of the conductive rollers, the detection accuracy is improved, the service life of equipment is prolonged, more accurate needle lifting position detection is provided through the arrangement of the multi-stage insulation parts and the conductive parts, and the high-precision jacquard requirement of the modern textile industry is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of testing institutions, and particularly relates to a needle lifting position detection mechanism for an electronic jacquard machine. Background Art

[0002] In the field of textile machinery, the detection of the needle lifting position of an electronic jacquard machine is crucial, and its accuracy directly affects the jacquard quality of fabrics. There are many drawbacks in traditional detection methods and urgent improvements are needed.

[0003] In the early stage, for the detection of the needle lifting position of an electronic jacquard machine, a scheme of installing a photoelectric sensor directly below each needle was often adopted. This scheme uses a steel sheet to connect the needles and drills a hole in the middle of the steel sheet. When jacquarding, the hole is located in the middle of the photoelectric sensor, and the sensor receives the induction and generates a signal; when not jacquarding, no induction signal is generated. By comparing the sampled data with the pattern file, jacquarding problems can be found. However, this method has serious defects: First, the needle lifting gap of the jacquard machine is extremely small (only 9 mm at the minimum), which poses strict requirements on the volume and anti-interference ability of the sensor, resulting in high detection costs. Taking a detection device with 5120 needles as an example, if the cost of a single sensor and the additional circuit is 30 yuan, the overall cost will be as high as more than 150,000 yuan. If the number of needles is more, the cost will be even more astonishing. Second, the installation and disassembly of the sensor are inconvenient and extremely troublesome during equipment maintenance and debugging. Third, due to the large number of sensors required for the head device and the working current reaching up to hundreds of amperes, this places a great burden on the power supply and the circuit. A large amount of heat is generated in the sensor array, causing the sensor to malfunction due to overheating, and the detection reliability is greatly reduced.

[0004] To solve the problems of traditional detection methods, there appears a needle lifting position detection mechanism for an electronic jacquard machine proposed in Patent CN101050577B. This mechanism uses a connecting component connected to the needle, which includes a conductor part and an insulating part. By slidingly contacting the first and second electrodes of the detection switch, it determines whether the needle is lifted according to the contact state of the connecting component with the electrodes (the conductor part contacts and conducts, and the insulating part contacts and disconnects). Although this method solves some problems of traditional detection, such as cost reduction and relatively simple structure, it still has certain limitations.

[0005] During long-term use, the sliding contact between the connecting component and the electrode is prone to wear, affecting the detection accuracy and the service life of the equipment; moreover, it only judges the needle lifting position through the simple combination of the conductor part and the insulating part, and the detection accuracy is limited, making it difficult to meet the requirements of modern textile industry for high-precision jacquarding.

[0006] To avoid the above technical problems, it is indeed necessary to provide a needle lifting position detection mechanism for an electronic jacquard machine to overcome the defects in the above technology. Summary of the Invention

[0007] The object of the present invention is to provide a needle lifting position detection mechanism for an electronic jacquard machine to solve the problems raised in the above-mentioned background art.

[0008] To achieve the above object, the present invention provides the following technical solution: A needle lifting position detection mechanism for an electronic jacquard machine, including a needle lifter and a detection switch. The detection switch includes an insulating plate and a conductive roller rotatably mounted on one side of the insulating plate. The bottom end of the needle lifter is connected with a heddle wire, the bottom end of the heddle wire is connected with an intermittent conductive wire formed by alternately connecting a plurality of insulating parts and conductive parts. The intermittent conductive wire is located on one side of the conductive roller. The bottom end of the intermittent conductive wire is connected with a harness part for threading the warp threads. The bottom end of the harness part is connected with a tension spring, and the bottom end of the tension spring is connected with a mounting plate.

[0009] When the needle lifter moves up and down, it will drive the intermittent conductive wire and the harness part to move up and down through the heddle wire. Among them, the intermittent conductive wire will contact the conductive contact surface on the conductive roller and drive the conductive roller to rotate through friction, so that the insulating parts and conductive parts on the intermittent conductive wire can contact the surface of the conductive roller at different heights up and down. When the conductive part contacts, the detection switch is turned on, and when the insulating part contacts, the detection switch is turned off.

[0010] As a preferred embodiment, the conductive roller is provided with an arc-shaped insulating inner wall, and the conductive contact surface on the conductive roller and the arc-shaped insulating inner walls on both sides thereof form a U-shaped contact groove as a whole. The intermittent conductive wire is located in the U-shaped contact groove.

[0011] As a preferred embodiment, the conductive contact surface on the conductive roller is provided with a plurality of conductive planes.

[0012] As a preferred embodiment, the plurality of conductive planes are in the shape of a regular polygon as a whole. When the intermittent conductive wire moves up and down and makes conductive contact, multiple sections of insulating parts and conductive parts on it will respectively contact the conductive planes on the conductive contact surface.

[0013] As a preferred embodiment, one side of the conductive roller abuts against one side of the intermittent conductive wire, so that the overall wire harness of the intermittent conductive wire is arc-shaped. When the needle lifter moves up and down, the pressing contact of the conductive roller on the intermittent conductive wire can not only achieve full conductive contact between the insulating part and the conductive part, but also increase the contact friction force between them, thereby effectively driving the conductive roller to rotate.

[0014] As a preferred embodiment, an insulating wheel frame is installed outside the conductive roller, and the conductive roller can rotate within the insulating wheel frame.

[0015] As a preferred embodiment, two spring pieces are jointly installed between the insulating wheel frame and the insulating plate.

[0016] As a preferred embodiment, both of the said spring pieces are U-shaped.

[0017] As a preferred embodiment, the two said spring pieces are respectively connected between the insulating wheel frame and the insulating plate through connecting blocks.

[0018] As a preferred embodiment, the connecting blocks on the same side of the two said spring pieces are staggeredly distributed, and during installation, connection is carried out through the bolts on the connecting blocks.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, when the needle lifter moves up and down, it drives the intermittent conductive wire to move up and down and contact the conductive roller, and makes it rotate through friction. According to the contact situation between the insulating part and the conductive part, the on-off of the detection switch is judged. Compared with the traditional scheme, this mechanism avoids the high cost, inconvenient installation and overheating problems of the photoelectric sensor; compared with the sliding contact detection mechanism, the rolling contact of the conductive roller greatly reduces wear, improves the detection accuracy and the service life of the equipment, and the multi-stage setting of the insulating part and the conductive part provides more accurate detection of the position of the needle lifter, meeting the high-precision jacquard requirements of the modern textile industry.

[0020] In the present invention, the multiple conductive planes on the conductive roller are integrally in the shape of a regular polygon. When the needle lifter moves up and down, the multiple insulating parts and conductive parts on the intermittent conductive wire can respectively contact the conductive planes. This design increases the orderliness and accuracy of the contact, improves the detection accuracy. At the same time, one side of the conductive roller presses against the intermittent conductive wire to make the wire harness contact surface arc-shaped. This setting not only ensures full conductive contact between the insulating part and the conductive part, but also increases the contact friction force between the two, provides sufficient power for the rotation of the conductive roller, stably realizes rolling conductive contact, effectively avoids detection errors caused by poor contact, further enhances the reliability and stability of the detection mechanism, and better meets the requirements of the modern textile industry for high-precision jacquard position detection.

[0021] In the present invention, the U-shaped contact groove on the conductive roller is composed of a conductive contact surface and two arc-shaped insulating inner walls on both sides, which can effectively limit the position of the intermittent conductive wire, so that it can stably contact the conductive plane during up and down movement, ensuring the accurate transmission of the detection signal. One side of the conductive roller presses against the intermittent conductive wire to make the wire harness arc-shaped, which also optimizes the contact effect. In addition, the two U-shaped spring pieces installed between the insulating wheel frame and the insulating plate, using the springback of the spring pieces to cooperate with the pressing of the conductive roller, further guarantees the position stability of the intermittent conductive wire in the U-shaped contact groove, prevents its accidental movement in the front, back, left and right directions, provides a stable support for the needle lifting movement of the electronic jacquard machine, and effectively improves the overall reliability and stability of the detection mechanism.

[0022] In the present invention, through the connection method of the connecting block and the bolt, the installation process of the spring piece is simple and precise. Installers can quickly locate the spring piece according to the position of the connecting block and fasten it with bolts, reducing the installation and debugging time. At the same time, the staggeredly distributed connecting blocks avoid interference between installation components, improving the convenience and reliability of mechanism installation, and helping to ensure that the needle lifting position detection mechanism of the electronic jacquard machine can be put into use efficiently and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 is a schematic diagram of the side three-dimensional structure of the intermittent conductive wire of the present invention; Figure 3 is a schematic diagram of the three-dimensional structure of the heddle part of the present invention; Figure 4 is a schematic diagram of the three-dimensional structure of the arc contact of the intermittent conductive wire of the present invention; Figure 5 is a schematic diagram of the sectional three-dimensional structure of the conductive roller of the present invention; Figure 6 is a schematic diagram of the top three-dimensional structure of the conductive roller of the present invention; Figure 7 is a schematic diagram of the side three-dimensional structure of the conductive roller of the present invention; Figure 8 is a schematic diagram of the three-dimensional structure of the spring piece of the present invention; Figure 9 is a schematic diagram of the three-dimensional structure of the connecting block of the present invention.

[0024] In the figure: 1. Needle lifting; 2. Detection switch; 21. Insulating plate; 22. Conductive roller; 221. Circular arc insulating inner wall; 222. Conductive plane; 223. Insulating wheel frame; 224. Spring piece; 2241. Connecting block; 3. Heddle part; 4. Tension spring; 5. Thread; 6. Intermittent conductive wire; 61. Insulating part; 62. Conductive part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further describes the present invention with reference to the embodiments.

[0026] The following embodiments are used to illustrate the present invention, but cannot be used to limit the protection scope of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions. Any simple improvement of the method of the present invention under the premise of the concept of the present invention belongs to the scope required to be protected by the present invention.

[0027] Please refer to Figures 1-9, the present invention provides a needle lifting position detection mechanism for an electronic jacquard machine, which includes a needle lifter 1 and a detection switch 2. The detection switch 2 includes an insulating plate 21 and a conductive roller 22 that can rotate on one side of the insulating plate 21. A thread guide 5 is connected to the bottom end of the needle lifter 1, and an intermittent conductive wire 6 is connected to the bottom end of the thread guide 5. The intermittent conductive wire 6 is formed by being connected at intervals through a plurality of insulating parts 61 and conductive parts 62. The intermittent conductive wire 6 is located on one side of the conductive roller 22. The bottom end of the intermittent conductive wire 6 is connected to a heddle part 3 for threading warp threads. The bottom end of the heddle part 3 is connected to a tension spring 4, and the bottom end of the tension spring 4 is connected to a mounting plate 7;

[0028] When the needle lifter 1 moves up and down, it will drive the intermittent conductive wire 6 and the heddle part 3 to move up and down through the thread guide 5. Among them, the intermittent conductive wire 6 will contact the conductive contact surface on the conductive roller 22 and drive the conductive roller 22 to rotate through friction, so that the insulating parts 61 and conductive parts 62 on the intermittent conductive wire 6 can contact the surface of the conductive roller 22 at different heights up and down. When the conductive part 62 contacts, the detection switch 2 is turned on, and when the insulating part 61 contacts, the detection switch 2 is turned off. When the needle lifter 1 moves up and down, it drives the intermittent conductive wire 6 to move up and down and contact the conductive roller 22, and makes it rotate through friction. The on-off of the detection switch 2 is judged according to the contact situation of the insulating part 61 and the conductive part 62. Compared with the traditional scheme, this mechanism avoids the high cost, inconvenient installation and overheating problems of photoelectric sensors; compared with the sliding contact detection mechanism, the rolling contact of the conductive roller 22 greatly reduces wear, improves detection accuracy and equipment life, and the setting of multiple-stage insulating parts 61 and conductive parts 62 provides more accurate detection of the position of the needle lifter 1, meeting the high-precision jacquard requirements of the modern textile industry.

[0029] As Figure 4 shown, an arc-shaped insulating inner wall 221 is provided on the conductive roller 22. The conductive contact surface on the conductive roller 22 and the arc-shaped insulating inner walls 221 on both sides thereof generally form a U-shaped contact groove, and the intermittent conductive wire 6 is located in the U-shaped contact groove.

[0030] As Figure 5 shown, a plurality of conductive planes 222 are provided on the surface of the conductive contact surface of the conductive roller 22.

[0031] As Figure 5 shown, the plurality of conductive planes 222 are integrally in the shape of a regular polygon. When the intermittent conductive wire 6 moves up and down and makes conductive contact, multiple sections of insulating parts 61 and conductive parts 62 on it will respectively contact the conductive planes 222 on the conductive contact surface.

[0032] As Figure 4 and Figure 5As shown, one side of the conductive roller 22 abuts against one side of the intermittent conductive wire 6, causing the wire harness of the entire intermittent conductive wire 6 to be arc-shaped. When the needle lifter 1 moves up and down, the pressing contact of the conductive roller 22 against the intermittent conductive wire 6 can not only achieve sufficient conductive contact between the insulating part 61 and the conductive part 62, but also increase the contact friction force between them, thereby effectively driving the conductive roller 22 to rotate.

[0033] As Figure 6 shown, an insulating wheel frame 223 is installed outside the conductive roller 22, and the conductive roller 22 can rotate within the insulating wheel frame 223.

[0034] As Figure 6 shown, two spring pieces 224 are jointly installed between the insulating wheel frame 223 and the insulating plate 21. The U-shaped contact groove on the conductive roller 22 is composed of a conductive contact surface and two arc-shaped insulating inner walls 221 on both sides, which can effectively limit the position of the intermittent conductive wire 6, enabling it to stably contact the conductive plane 222 during up and down movement, ensuring the accurate transmission of detection signals. One side of the conductive roller 22 presses against the intermittent conductive wire 6 to make its wire harness arc-shaped, which also optimizes the contact effect. In addition, the two U-shaped spring pieces 224 installed between the insulating wheel frame 223 and the insulating plate 21, using the resilience of the spring pieces 224 in cooperation with the pressing of the conductive roller 22, further ensures the position stability of the intermittent conductive wire 6 within the U-shaped contact groove, preventing its accidental movement in all directions, providing a stable support for the needle lifting movement of the electronic jacquard machine, and effectively improving the overall reliability and stability of the detection mechanism.

[0035] As Figure 8 shown, both of the two spring pieces 224 are U-shaped.

[0036] As Figure 6 and Figure 9 shown, the two spring pieces 224 are respectively connected between the insulating wheel frame 223 and the insulating plate 21 through connecting blocks 2241.

[0037] As Figure 9 shown, the connecting blocks 2241 on the same side of the two spring pieces 224 are staggeredly distributed. During installation, they are connected through bolts on the connecting blocks 2241. Through the connection method of the connecting blocks 2241 and bolts, the installation process of the spring pieces 224 is simple and accurate. Installers can quickly locate the spring pieces 224 according to the positions of the connecting blocks 2241 and tighten them with bolts, reducing the installation and debugging time. At the same time, the staggeredly distributed connecting blocks 2241 avoid interference between installation components, improving the convenience and reliability of mechanism installation, and helping to ensure that the needle position detection mechanism of the electronic jacquard machine can be put into use efficiently and stably.

[0038] Working principle and usage process of the present invention: During actual installation, fix the insulating plate 21 at a suitable position on the electronic jacquard machine to ensure that the detection switch 2 is stably in place. The conductive roller 22 is installed on one side of the insulating plate 21 through the U-shaped spring piece 224 and the insulating wheel holder 223. When the electronic jacquard machine is working, the lifting needle 1 moves up and down according to the jacquard instruction, drives the intermittent conductive wire 6 and the harness part 3 to move up and down synchronously through the connecting wire 5. During the movement of the intermittent conductive wire 6, it contacts the conductive contact surface on the conductive roller 22, and drives the conductive roller 22 to rotate by relying on friction. The insulating part 61 and the conductive part 62 on it will contact the conductive plane 222 on the surface of the conductive roller 22 at different heights up and down. The plurality of conductive planes 222 as a whole are regular polygons. When the conductive part 62 contacts the conductive plane 222, the detection switch 2 is turned on; when the insulating part 61 contacts, the detection switch 2 is turned off. By monitoring the on-off states of the detection switch 2 at different heights, accurately judge the real-time position of the lifting needle 1, and realize the accurate detection of the lifting needle position of the electronic jacquard machine; During actual operation, the on-off signal of the detection switch 2 will be transmitted to the signal processing circuit connected to it. There is a counter in this circuit. When the detection switch 2 is turned on, the circuit receives the electrical signal and converts it into a digital signal "1", and the counter performs corresponding counting operations; when the detection switch 2 is turned off, the signal is converted into a digital signal "0", and the counter also performs corresponding counting changes. For example, it is set that when the lifting needle rises, the on-signal of the detection switch makes the counter increase by 1, and when it falls, the off-signal makes the counter decrease by 1. Combining the preset movement range of the lifting needle, the lengths of the conductive part 62 and the insulating part 61, and the detection accuracy, the real-time position of the lifting needle 1 can be accurately calculated based on the counter value; During complex jacquard operations, the lifting needle 1 moves frequently and at high speed. This detection mechanism ensures accurate detection through various designs. The plurality of conductive planes 222 in the shape of regular polygons on the conductive roller 22 are in orderly contact with the insulating part 61 and the conductive part 62 of the intermittent conductive wire 6, and can ensure accurate contact even when the lifting needle moves rapidly. The intermittent conductive wire 6 is in an arc shape under the pressing of the conductive roller 22, increasing the contact friction force, preventing the intermittent conductive wire 6 from slipping with the conductive roller 22 during the high-speed movement of the lifting needle, and stably transmitting the on-off signal. The U-shaped contact groove restricts the position of the intermittent conductive wire 6 so that it will not shift. The resilience of the spring piece 224 maintains the pressing force on the intermittent conductive wire 6, avoiding signal errors caused by poor contact; Through the collaborative work of the insulating wheel holder 223, the spring piece 224 and the connecting block 2241, the insulating wheel holder 223 ensures the smooth rotation of the conductive roller 22. The elastic force of the spring piece 224 keeps the stable contact pressure between the conductive roller 22 and the intermittent conductive wire 6. The staggered distribution of the connecting blocks 2241 enhances the overall structural stability and reduces the displacement of components caused by vibration or external interference.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electronic jacquard machine needle position detection mechanism, comprising a needle lifter (1) and a detection switch (2), characterized in that: The detection switch (2) comprises an insulating plate (21) and a rotatable conductive roller (22) mounted on one side of the insulating plate (21); the bottom end of the lifting needle (1) is connected to a harness (5); the bottom end of the harness (5) is connected to an intermittent conductive wire (6); the intermittent conductive wire (6) is formed by a plurality of insulating parts (61) and conductive parts (62) connected to each other at intervals; the intermittent conductive wire (6) is located on one side of the conductive roller (22); the bottom end of the intermittent conductive wire (6) is connected to a heald wire part (3) for passing through the warp wires; the bottom end of the heald wire part (3) is connected to a tensioning spring (4); the bottom end of the tensioning spring (4) is connected to a mounting plate (7); When the lifting needle (1) moves up and down, the intermittent conductive wire (6) and the harness wire portion (3) are driven to move up and down through the harness wire (5), wherein the intermittent conductive wire (6) contacts the conductive contact surface on the conductive roller (22), and drives the conductive roller (22) to rotate through friction, so that the insulating portion (61) and the conductive portion (62) on the intermittent conductive wire (6) can contact the surface of the conductive roller (22) at different heights up and down, and when the conductive portion (62) contacts, the detection switch (2) is turned on, and when the insulating portion (61) contacts, the detection switch (2) is turned off.

2. The electronic jacquard machine needle position detection mechanism according to claim 1, characterized in that: The conductive roller (22) is provided with an arc-shaped insulating inner wall (221); the conductive contact surface on the conductive roller (22) and the arc-shaped insulating inner walls (221) on both sides thereof generally form a U-shaped contact groove; the intermittent conductive wire (6) is located in the U-shaped contact groove.

3. The electronic jacquard machine needle position detection mechanism according to claim 1, characterized in that: The conductive contact surface on the conductive roller (22) is provided with a plurality of conductive planes (222).

4. The electronic jacquard machine needle position detection mechanism according to claim 3, characterized in that: The plurality of conductive planes (222) are generally regular polygons, and when the intermittent conductive wire (6) moves up and down for conductive contact, the plurality of insulating portions (61) and conductive portions (62) thereon will respectively contact the conductive planes (222) on the conductive contact surface.

5. The electronic jacquard needle position detection mechanism according to claim 4, characterized in that: One side of the conductive roller (22) is pressed against one side of the intermittent conductive wire (6), so that the entire wire bundle of the intermittent conductive wire (6) is in an arc shape. When the lifting needle moves up and down, the pressing contact of the conductive roller (22) against the intermittent conductive wire (6) can not only achieve full conductive contact between the insulating part (61) and the conductive part (62), but also increase the contact friction between them, thereby effectively driving the conductive roller (22) to rotate.

6. The electronic jacquard machine needle position detection mechanism according to claim 1, characterized in that: An insulating wheel frame (223) is installed outside the conductive roller (22), and the conductive roller (22) can rotate inside the insulating wheel frame (223).

7. The electronic jacquard needle position detection mechanism according to claim 6, characterized in that: Two spring sheets (224) are installed between the insulating wheel frame (223) and the insulating plate (21).

8. The electronic jacquard machine needle position detection mechanism according to claim 7, characterized in that: The two spring sheets (224) are both U-shaped.

9. The electronic jacquard machine needle position detection mechanism according to claim 7, characterized in that: The two spring sheets (224) are respectively connected between the insulating wheel frame (223) and the insulating plate (21) via connecting blocks (2241).

10. The electronic jacquard machine needle position detection mechanism according to claim 9, characterized in that: The connecting blocks (2241) on the same side of the two spring sheets (224) are staggered and distributed, and during installation, they are connected via bolts on the connecting blocks (2241).

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