A knitting yarn feeding device

Abstract

The present application relates to the technical field of knitting machinery, and discloses a knitting yarn feeding device, which comprises a shell and a circuit seat installed at the bottom of the shell, wherein front and rear detectors, front and rear detection circuit boards are arranged on the circuit seat, magnetic elements are arranged at the heads of the probe rods of the front and rear detectors respectively, and induction elements are arranged on the detection circuit boards respectively. The circuit seat is provided with two guide holes, the detection circuit boards are respectively extended into the corresponding guide holes through the hollow support columns of the circuit board mounting seats, and can be independently adjusted up and down relative to the magnetic elements; the front and rear detection circuit boards are further elastically and conductively connected with the main circuit board through at least two second spring elements. The structure can improve the yarn breakage detection stability, adjustment convenience and electrical connection reliability.

Description

Technical Field

[0001] This invention relates to the field of knitting machinery technology, and more specifically, to a knitting yarn feeding device. Background Technology

[0002] The yarn feeding device is an important yarn supply component in knitting equipment, such as... Figure 1 and 2 The existing knitting yarn feeding device shown generally includes a housing A, a drive pulley B and a clutch C located above the housing A, and a yarn feeding wheel D located below the housing A. A drive shaft runs vertically through the housing A, with its upper part connected to the drive pulley B and the clutch C, and its lower part connected to the yarn feeding wheel D. A matching circuit socket E is installed below the housing A. A front probe F and a rear probe G are installed in the U-shaped groove of the circuit socket E. A front probe contact P and a rear probe contact Q are fastened to the circuit socket E. The operation and stopping of the knitting machine are controlled by the opening and closing of the head of the front probe F and the front probe contact P, or the head of the rear probe G and the rear probe contact Q. During operation, the transmission belt on the knitting machine drives the transmission pulley B on the upper part of the yarn feeding device to rotate. The rotation is transmitted to the yarn feeding wheel D via the clutch C and the transmission shaft, causing the yarn feeding wheel D to rotate. This pulls the yarn from the yarn bobbin H out and winds it around the circumference of the yarn feeding wheel D after passing through a guide frame L, a pair of yarn pressing plates N, a yarn knot filter J, below the front detection rod F, and the yarn inlet ceramic ring K. At the same time, the yarn on the yarn feeding wheel D passes through the yarn outlet ceramic ring M and below the rear detection rod G to supply the knitting needles on the knitting machine for operation.

[0003] During normal operation, the front probe F and the rear probe G are lifted by the tension of the yarn, causing the head of the front probe F to separate from the surface of the front contact plate P, and the head of the rear probe G to separate from the surface of the rear contact plate Q. When the yarn breaks, the head of the front probe F or the rear probe G comes into contact with the surface of the front contact plate P or the head of the rear probe G to separate from the surface of the rear contact plate Q under its own weight, causing the circuit to be connected and the knitting machine to stop running, thus preventing the production of defective fabric. Therefore, the quality of their contact performance directly affects whether the knitting machine can operate normally.

[0004] In existing knitting yarn feeding devices, the mating surfaces of housing A and circuit base E are uneven and not on the same plane, resulting in a certain gap between their mating surfaces. Furthermore, the front probe F and rear probe G are installed in the U-shaped groove of circuit base E, and a relatively large mating gap is also provided to allow for flexible movement of the front probe F and rear probe G. As a result, during use, lint and dust can easily enter the interior of the circuit base, affecting the contact surfaces of the head of the front probe F and the front contact plate P, and the head of the rear probe G and the rear contact plate Q. This reduces or eliminates electrical contact performance, thus shortening the service life of the knitting yarn feeding device.

[0005] Furthermore, yarn feeding devices are typically installed on the steel rings or frame of the knitting machine, and are affected by factors such as the rotation of transmission components, vibration of the entire knitting machine, and cleaning and dust removal airflow during operation. Existing yarn breakage detection components are usually concentrated near the circuit board, where the internal space is limited, and the related electrical connections and detection components are arranged compactly. If there are assembly deviations in the installation position of the detection components, or if their position shifts after long-term vibration, it may lead to inconsistent yarn breakage detection sensitivity, thus affecting the accuracy of the detection actions before and after. At the same time, the connections between electrical components inside the circuit board are also easily affected by space constraints and vibration; ordinary wiring or plug-in structures may become loose, have poor contact, or be inconvenient to maintain after long-term use. Therefore, existing knitting yarn feeding devices not only suffer from the problem of easily contaminated yarn breakage detection contacts, but also have issues with the need to improve the installation stability of detection components, the reliability of electrical connections, and the convenience of subsequent maintenance. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a knitting yarn feeding device that can effectively detect yarn breakage, has a stable electrical connection, and features a compact structure for the yarn breakage detection component.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A knitting yarn feeding device includes a housing and a drive shaft that vertically penetrates the housing. With the housing as the boundary, a drive pulley and a clutch are arranged sequentially from top to bottom on the upper part of the drive shaft, and a yarn feeding wheel is arranged on the lower part of the drive shaft. A circuit base is installed at the bottom of the housing, and a detector assembly is integrated on the circuit base. The front detector includes a front probe rod and a front magnetic element disposed at the head of the front probe rod. The front probe rod is hinged to the circuit base with its head. The front detection circuit board is mounted on the front detection circuit board mounting base and is located above the front magnetic element. The front detection circuit board is provided with a front sensing element. When the tail of the front probe rod falls down, the front magnetic element moves upward into the sensing area of ​​the front sensing element. The rear detector includes a rear probe rod and a rear magnetic element disposed at the head of the rear probe rod. The rear probe rod is hinged to the circuit base with its head. The rear detection circuit board is mounted on the rear detection circuit board mounting base and is located above the rear magnetic element. The rear detection circuit board is provided with a rear sensing element. When the tail of the rear probe rod falls down, the rear magnetic element moves upward and enters the sensing area of ​​the rear sensing element. The front and rear detectors are located on the same side of the circuit base, and the front and rear detectors are installed at different heights. The circuit base is provided with two guide holes extending in the vertical direction. The front detection circuit board mounting base and the rear detection circuit board mounting base are respectively provided with hollow support columns extending into the corresponding guide holes. Each support column is provided with a nut and a first spring element located below the nut. The nut is restricted in the support column and cannot rotate relative to the support column. The bottom of the guide hole is provided with a screw hole. The adjusting screw passes through the screw hole and the hollow part of the first spring element from below the circuit base and screws into the nut. The nut is provided with an anti-loosening element to prevent the adjusting screw from loosening, so that the front detection circuit board and the rear detection circuit board can be adjusted up and down relative to the corresponding magnetic element respectively. The circuit board is equipped with a main circuit board. Both the front detection circuit board and the rear detection circuit board are equipped with at least two second spring elements. One end of each second spring element is connected to the corresponding detection circuit board, and the other end elastically abuts against the conductive surface of the main circuit board. The elastic deformation direction of the second spring element is consistent with the movement direction of the support column in the guide hole.

[0008] Preferably, the circuit base is provided with two sets of hinged fixing positions. Each set of hinged fixing positions includes corresponding U-shaped grooves respectively opened on both sides of the circuit base, with the openings of the U-shaped grooves facing upwards. The transverse rod of the front probe head is installed in one set of U-shaped grooves, and the transverse rod of the rear probe head is installed in the other set of U-shaped grooves.

[0009] Preferably, the front probe has a detachable and fixed front magnetic element seat on its head transverse rod, and the front magnetic element seat cannot rotate around the head transverse rod; the front magnetic element seat has a cylindrical space area for accommodating the front magnetic element, and the front magnetic element is embedded and fixed in this space area. The head transverse rod of the rear probe is detachably fixed with a rear magnetic element seat, and the rear magnetic element seat cannot rotate around the head transverse rod; the rear magnetic element seat is provided with a cylindrical space area to accommodate the rear magnetic element, and the rear magnetic element is embedded and fixed in the space area.

[0010] Preferably, the transverse rod portion of the head of the front probe extends outward to form a frame-shaped fixing area, and the front magnetic element seat is provided with a first opening fixing groove that matches it. The frame-shaped fixing area is embedded in the first opening fixing groove to fix and connect the front probe and the front magnetic element seat. The head of the rear probe rod also extends outward to form a frame-shaped fixing area. The rear magnetic element seat is provided with a second opening fixing groove that matches it. The frame-shaped fixing area is embedded in the second opening fixing groove to fix and connect the rear probe rod and the rear magnetic element seat.

[0011] Preferably, the front detection circuit board is fixed to the circuit base by a front detection circuit board mounting base, and a buckle is provided on each side of one side of the front detection circuit board mounting base, and the two sides of the front detection circuit board are respectively fastened and limited by the buckles. The rear detection circuit board is fixed to the circuit base by the rear detection circuit board mounting base. Each side of one side of the rear detection circuit board mounting base is provided with a buckle, and the two sides of the rear detection circuit board are respectively fastened and limited by the buckles.

[0012] Preferably, the circuit board is also provided with contact pins and contact plates; the contact pins abut against the contact plates, and the contact plates abut against the main circuit board; The casing is made of metal and is electrically conductive; The stylus, contact plate, main circuit board, second spring element, front detection circuit board, rear detection circuit board, and housing constitute part of the circuit loop.

[0013] Preferably, both the front detection circuit board and the rear detection circuit board are provided with support arms, and the second spring element is sleeved and fixed on the support arms.

[0014] Preferably, both the front and rear sensing elements are reed switches, with the reed switch contacts located inside the glass tube.

[0015] Preferably, a light guide post (20) is provided at the bottom of the circuit base (6), one end of which corresponds to the indicator light on the main circuit board (18), and the other end is exposed on the outer side of the bottom of the circuit base (6).

[0016] This invention provides a knitting yarn feeding device. By arranging a front detector, a rear detector, a front detection circuit board, and a rear detection circuit board on a circuit base, the front magnetic element at the head of the front probe engages with the front sensing element, and the rear magnetic element at the head of the rear probe engages with the rear sensing element. When a yarn breaks, the tail of the probe falls, causing the magnetic element to move upwards into the corresponding sensing area, thus outputting a yarn breakage signal in a non-contact manner. This reduces the impact of lint, dust, and oxidation of the contact surface on traditional contact-type detection structures. Simultaneously, the front and rear detection circuit boards are mounted via front and rear detector circuit board mounting bases, respectively, and form independent up-and-down adjustment structures using guide holes, hollow support columns, nuts, a first spring element, and adjusting screws, allowing the front and rear detection circuit boards to be adjusted independently. The sensing distance of the corresponding magnetic components is calibrated to reduce the impact of assembly errors of the probe, magnetic component holder, circuit board, and circuit socket on the detection sensitivity. Furthermore, an anti-loosening element is installed inside the nut to prevent the adjusting screw from loosening under the action of high-speed yarn feeding vibration, knitting machine vibration, and dust removal airflow, so that the calibrated detection distance remains stable. In addition, both the front and rear detection circuit boards are elastically abutted against the conductive surface of the main circuit board through at least two second spring elements. The elastic deformation direction of the second spring elements is consistent with the movement direction of the support column in the guide hole, so that the detection circuit board can maintain a stable electrical connection with the main circuit board even under vertical adjustment and long-term vibration environment, thereby improving the reliability of yarn breakage detection, vibration resistance stability, assembly and debugging convenience, and circuit connection reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a yarn feeding device in the prior art.

[0018] Figure 2 This is a schematic diagram of the structure of a circuit base and detector assembly in the prior art.

[0019] Figure 3 This is a cross-sectional view of the yarn feeding device of this application.

[0020] Figure 4 This is one of the structural schematic diagrams of the circuit base and detector assembly of the yarn feeding device in this application.

[0021] Figure 5 This is the second schematic diagram of the circuit base and detector assembly of the yarn feeding device in this application.

[0022] Figure 6 This is a top view of the circuit base and detector assembly of the yarn feeding device of this application.

[0023] Figure 7 for Figure 6 A cross-sectional view of AA.

[0024] Figure 8 This is one of the exploded views of the circuit base and detector assembly of the yarn feeding device in this application.

[0025] Figure 9 This is the second exploded view of the circuit base and detector assembly of the yarn feeding device of this application.

[0026] Figure 10 This is a schematic diagram of the circuit socket.

[0027] Figure 11 This is an exploded view of the former detector.

[0028] Figure 12 This is an exploded view of the rear probe.

[0029] Reference numerals: 1-House, 2-Drive shaft, 3-Drive pulley, 4-Clutch, 5-Wire feed wheel, 6-Circuit socket, 61-Guide hole, 62-Support column, 63-Screw hole, 64-First spring element, 65-U-groove, 7-Front detector, 71-Front probe rod, 72-Front magnetic element, 73-Front magnetic element seat, 731-First opening fixing groove, 8-Rear detector, 81-Rear probe rod, 82-Rear magnetic element, 83-Rear magnetic element seat, 831-Second opening fixing groove, 9-Adjusting screw 10-Nut, 101-Anti-loosening element, 11-Front detection circuit board mounting base, 112-Snap fastener, 12-Rear detection circuit board mounting base, 13-Front detection circuit board, 131-Front sensing element, 14-Rear detection circuit board, 141-Rear sensing element, 15-Second spring element, 16-Contact pin, 17-Contact piece, 18-Main circuit board, 19-Support arm, 20-Light guide post, 21-Wire guide frame, 22-Yarn pressing piece, 23-Yarn knot filter, 24-Yarn inlet ceramic ring, 25-Yarn outlet ceramic ring. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0031] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] like Figure 3As shown, this application provides a knitting yarn feeding device, which can be fixed to the steel ring or other frame mounting part of a circular knitting machine by fastening screws. The knitting yarn feeding device includes a housing 1, a drive shaft 2, a drive pulley 3, a clutch 4, a yarn feeding wheel 5, and a circuit base 6. The housing 1 serves as the main support component of the yarn feeding device, and its interior forms an installation space for the drive shaft 2 to pass through and be supported. The drive shaft 2 passes through the housing 1 vertically, with its upper end extending beyond the upper side of the housing 1 and its lower end extending beyond the lower side of the housing 1. With the housing 1 as the boundary, the drive pulley 3 and the clutch 4 are installed sequentially from top to bottom on the upper part of the drive shaft 2, and the yarn feeding wheel 5 is installed on the lower part of the drive shaft 2. The drive pulley 3 is used to cooperate with the drive belt on the knitting machine. When the knitting machine is running, the drive belt drives the drive pulley 3 to rotate, and the drive pulley 3 transmits the rotational power to the drive shaft 2 through the clutch 4. The drive shaft 2 further drives the yarn feeding wheel 5 to rotate, thereby realizing the traction and feeding of yarn. The clutch 4 is located between the transmission pulley 3 and the housing 1, and is used to engage or disengage the transmission in the transmission path, so that the thread feed wheel 5 can rotate or stop according to the working state of the knitting machine.

[0033] The circuit base 6 is mounted on the bottom of the housing 1 and located on one side of the feed wheel 5. The circuit base 6 can be fixed to the housing 1 by screws, snap-fit ​​structures, or a combination of screws and snap-fit ​​structures. The circuit base 6 serves as the mounting base for the detector assembly and control circuit assembly, and integrates the front detector 7, rear detector 8, front detector circuit board mounting base 11, rear detector circuit board mounting base 12, front detection circuit board 13, rear detection circuit board 14, contact pin 16, contact piece 17, main circuit board 18, and light guide post 20. The housing 1 can be made of metal, and the circuit base 6 can be made of insulating plastic, enabling the circuit base 6 to both support electrical components and provide necessary isolation between the relevant conductive parts and the external structure.

[0034] like Figure 3As shown, the yarn feeding path also includes a guide rail 21, a yarn pressing plate 22, a yarn knot filter 23, an inlet ceramic ring 24, and an outlet ceramic ring 25. The guide rail 21 is mounted on the housing 1 or a supporting structure connected to the housing 1, and is used to guide the yarn output from the yarn bobbin into the yarn feeding device. The yarn pressing plate 22 is located after the guide rail 21. The yarn pressing plate 22 can be a pair of oppositely arranged sheet-like pieces, forming a clamping gap between them to allow the yarn to pass through, and is used to apply appropriate damping to the yarn. The yarn knot filter 23 is located after the yarn pressing plate 22, and is used to block or detect larger knots or abnormally thick sections in the yarn. The inlet ceramic ring 24 is located on the inlet side of the yarn feeding wheel 5, and is used to reduce friction and wear of the yarn before it enters the yarn feeding wheel 5; the outlet ceramic ring 25 is located on the outlet side of the yarn feeding wheel 5, and is used to guide the yarn out of the yarn feeding wheel 5. During operation, after the yarn is drawn out from the yarn bobbin, it passes through the conductor frame 21, the yarn pressing plate 22, the yarn knot filter 23, the area below the front detector 7 and the yarn inlet ceramic ring 24 in sequence, and then winds around the circumferential surface of the yarn feed wheel 5. After the yarn on the yarn feed wheel 5 is output, it passes through the yarn outlet ceramic ring 25 and the area below the rear detector 8, and then is supplied to the knitting machine needles for knitting operations.

[0035] like Figures 4 to 6 As shown, both the front detector 7 and the rear detector 8 are mounted on the circuit base 6, and are located on the same side of the circuit base 6. The front detector 7 and the rear detector 8 are mounted at different horizontal heights; that is, they are staggered relative to the circuit base 6, allowing the swing areas of the front detector 7 and the rear detector 8 to avoid each other. Through this staggered arrangement on the same side, the overall width of the circuit base 6 can be controlled within a small range, ensuring that the front detector 7 and the rear detector 8 do not collide or interfere with each other during yarn tensioning, yarn breakage, and reset.

[0036] The circuit base 6 has two sets of hinged fixing positions, each set including corresponding U-shaped grooves 65 on both sides of the circuit base 6. The openings of the U-shaped grooves 65 face upwards, allowing the front detector 7 and the rear detector 8 to be inserted into the corresponding U-shaped grooves 65 from above. The front detector 7 engages with one set of U-shaped grooves 65 via the transverse rod at the head of the front probe 71, and the rear detector 8 engages with the other set of U-shaped grooves 65 via the transverse rod at the head of the rear probe 81. The transverse rod at the head of each probe spans across the corresponding U-shaped grooves 65 on both sides of the circuit base 6, allowing the front detector 7 and the rear detector 8 to swing relative to the circuit base 6 about their respective transverse rods as the axis of rotation. Because the U-shaped grooves 65 have upward openings, the front detector 7 and the rear detector 8 do not require complex riveting or pin fixing during assembly; the transverse rods at the head of the corresponding probes can be directly placed into the U-shaped grooves 65, facilitating assembly and maintenance.

[0037] like Figure 11As shown, the front detector 7 includes a front probe rod 71, a front magnetic element 72, and a front magnetic element holder 73. The front probe rod 71 is a linear or rod-shaped bent member, with one end forming a head near the circuit base 6 and the other end forming a tail for engaging with yarn. A transverse rod is provided at the head of the front probe rod 71, with a portion of the upper part of the transverse rod protruding outward to form a frame shape. This transverse rod serves as a pivot point for the hinge between the front detector 7 and the circuit base 6, and also mounts the front magnetic element holder 73 through the protruding frame shape. The front magnetic element holder 73 can be made of a material with elastic deformation capabilities, such as plastic, and has a first opening fixing groove 731. The first opening fixing groove 731 is used to enclose and hold the transverse rod at the head of the front probe rod 71, and the opening size of the first opening fixing groove 731 can be smaller than the diameter or width of the transverse rod at the head of the front probe rod 71. During assembly, the transverse head of the front probe 71 is pressed into the opening of the first opening fixing groove 731, and the front magnetic element seat 73 undergoes elastic deformation at the opening. After the transverse head of the front probe 71 enters the first opening fixing groove 731, the opening of the first opening fixing groove 731 is restored, thereby preventing the front probe 71 from coming out. This structure enables a reliable connection between the front magnetic element seat 73 and the front probe 71, and restricts the front magnetic element seat 73 from rotating relative to the front probe 71 around the transverse head.

[0038] The front magnetic element holder 73 also has a cylindrical space region for accommodating the front magnetic element 72. The front magnetic element 72 can be a cylindrical permanent magnet. The front magnetic element 72 is embedded in the cylindrical space region and fixed, so that the front magnetic element 72 and the front magnetic element holder 73 remain relatively fixed. Since the front magnetic element holder 73 is fixed to the head of the front probe 71, when the front probe 71 swings, the front magnetic element 72 can change its spatial position synchronously with the front probe 71.

[0039] like Figure 12As shown, the rear detector 8 includes a rear probe rod 81, a rear magnetic element 82, and a rear magnetic element seat 83. The rear probe rod 81 is also a linear or rod-shaped bent component, with its head at the end near the circuit seat 6 and its tail at the end away from the circuit seat 6 and used to engage with yarn. The head of the rear probe rod 81 has a transverse rod, which is placed in the corresponding U-shaped groove 65 of the circuit seat 6, allowing the rear detector 8 to swing about this transverse rod as an axis. The transverse rod at the head of the rear probe rod 81 also includes a portion that protrudes outward to form a frame shape. The rear magnetic element seat 83 has a second opening fixing groove 831, which is used to contain and hold the protruding frame shape. The opening size of the second opening fixing groove 831 can be smaller than the diameter or width of the transverse rod at the head of the rear probe rod 81, allowing the rear magnetic element seat 83 to elastically deform and press the rear probe rod 81 in during assembly, and to elastically recover and prevent the rear probe rod 81 from dislodging after assembly. The rear magnetic element holder 83 is also provided with a cylindrical space region for accommodating the rear magnetic element 82, which is embedded and fixed within this cylindrical space region. Thus, the rear magnetic element 82 can move closer to or further away from the rear detection circuit board 14 in sync with the swing of the subsequent probe 81.

[0040] like Figures 4 to 9 As shown, the front detection circuit board 13 is mounted on the circuit base 6 via the front detection circuit board mounting base 11, and the rear detection circuit board 14 is mounted on the circuit base 6 via the rear detection circuit board mounting base 12. The front detection circuit board mounting base 11 and the rear detection circuit board mounting base 12 are respectively located above the circuit base 6 and above the corresponding magnetic components. The front detection circuit board mounting base 11 has a plate-shaped bearing surface for mounting the front detection circuit board 13, and the front detection circuit board 13 is attached to this plate-shaped bearing surface. Buckles 112 are respectively provided on both sides of the bearing surface of the front detection circuit board mounting base 11, and the two side edges of the front detection circuit board 13 are respectively fastened and limited by the corresponding buckles 112. Furthermore, the front detection circuit board 13 can be provided with positioning holes, and the front detection circuit board mounting base 11 can be provided with positioning posts that cooperate with the positioning holes; during installation, the positioning holes of the front detection circuit board 13 are first fitted onto the positioning posts, and then the front detection circuit board 13 is pushed inward. When the edge of the current test circuit board 13 presses against the inclined surface of the buckle 112, the buckle 112 elastically deforms outward; after the current test circuit board 13 is installed in place, the buckle 112 elastically resets, and the inner plane of the buckle 112 blocks the outward movement of the front test circuit board 13, thereby realizing the detachable limiting and fixing of the front test circuit board 13.

[0041] The rear detection circuit board mounting base 12 also has a plate-shaped bearing surface for mounting the rear detection circuit board 14. The rear detection circuit board 14 is mounted on the rear detection circuit board mounting base 12 and is secured and limited by latches 112 located on both sides of the rear detection circuit board mounting base 12. Furthermore, the rear detection circuit board 14 may also be provided with positioning holes, and positioning posts may be provided on the rear detection circuit board mounting base 12. During installation, the positioning holes of the rear detection circuit board 14 are fitted into the positioning posts, and then the rear detection circuit board 14 is pushed inward and presses against the inclined surface of the latches 112, causing the latches 112 to undergo elastic deformation. After the rear detection circuit board 14 is assembled in place, the latches 112 reset and block the rear detection circuit board 14, so that the rear detection circuit board 14 can be reliably mounted on the rear detection circuit board mounting base 12.

[0042] like Figures 7 to 10 As shown, the circuit base 6 is provided with a guide hole 61. The guide hole 61 is arranged vertically and is used to guide the vertical adjustment of the front detection circuit board mounting base 11 and the rear detection circuit board mounting base 12. The front detection circuit board mounting base 11 and the rear detection circuit board mounting base 12 each have a downwardly extending support post 62, which is adapted to the corresponding guide hole 61. After the support post 62 is inserted into the guide hole 61, the outer wall of the support post 62 is constrained by the inner wall of the guide hole 61, so that the front detection circuit board mounting base 11 and the rear detection circuit board mounting base 12 can only move vertically along the axial direction of the guide hole 61, and are not prone to lateral sway.

[0043] Each support column 62 can be a hollow structure. A nut 10 is installed inside the support column 62, and the nut 10 is fixed inside the support column 62 and cannot rotate relative to it. Specifically, the support column 62 can have a square hole, a non-circular hole, or a receiving cavity with a limiting step. The nut 10 is embedded in this receiving cavity, and is limited by the side wall of the receiving cavity, preventing it from rotating. A threaded hole 63 is provided at the bottom of the guide hole 61. The adjusting screw 9 passes through the threaded hole 63 from below the circuit base 6 and extends into the support column 62, where it is threadedly connected to the nut 10. A first spring element 64 is also provided inside the support column 62, located below the nut 10. The adjusting screw 9 passes through the hollow part of the first spring element 64 and screws into the nut 10. One end of the first spring element 64 abuts against the inner wall near the support column 62 or the nut 10, and the other end abuts against the circuit base 6, ensuring that the support column 62 is always subjected to an elastic pushing force along the axial direction of the guide hole 61.

[0044] During adjustment, screwing in the adjusting screw 9 causes relative threaded movement between the adjusting screw 9 and the nut 10. Since the nut 10 cannot rotate, it drives the support column 62 to move downward along the guide hole 61, thereby causing the corresponding front detection circuit board mounting base 11 or rear detection circuit board mounting base 12 to move downward, bringing the front detection circuit board 13 or rear detection circuit board 14 mounted on it closer to the corresponding magnetic element. When the adjusting screw 9 is unscrewed, the elastic force of the first spring element 64 pushes the support column 62 upward along the guide hole 61, causing the corresponding circuit board mounting base and the detection circuit board to move upward synchronously, thus moving the detection circuit board away from the corresponding magnetic element. Through this structure, the sensing distance between the front detection circuit board 13 and the front magnetic element 72, and the sensing distance between the rear detection circuit board 14 and the rear magnetic element 82 can be adjusted independently, which facilitates the elimination of the influence of assembly errors of the probe, magnetic element base, circuit board, and circuit socket on the sensing sensitivity.

[0045] To prevent the adjusted position of the detection circuit board from changing under the vibration of high-speed yarn feeding, the vibration of the entire knitting circular knitting machine, and the impact of dust removal air blowing, an anti-loosening element 101 is provided inside the nut 10. The anti-loosening element 101 can be a nylon anti-loosening ring, an anti-loosening rubber layer, an elastic insert, or other structures that can increase the friction of the threaded pair. After the adjusting screw 9 is screwed into the nut 10, the anti-loosening element 101 continuously clamps or frictionally limits the adjusting screw 9, thereby reducing the probability of the adjusting screw 9 loosening due to vibration.

[0046] The front detection circuit board 13 is positioned above the front magnetic element 72, and a front sensing element 131 is disposed on the front detection circuit board 13. The front sensing element 131 can be a reed switch, a Hall element, a magnetoresistive element, or other sensing element capable of responding to changes in magnetic field; a reed switch is preferred. The rear detection circuit board 14 is positioned above the rear magnetic element 82, and a rear sensing element 141 is disposed on the rear detection circuit board 14. The rear sensing element 141 can be a reed switch, a Hall element, a magnetoresistive element, or other sensing element capable of responding to changes in magnetic field; a reed switch is preferred. When a reed switch is used, the reed switch contacts are located inside a sealed glass tube, which can reduce the influence of fluff, dust, and oil on the contact state of the contacts.

[0047] During normal yarn feeding, the yarn passes under the front detector 7 and the rear detector 8 respectively, and the yarn tension supports the tails of the front detector 7 and the rear detector 8 in an elevated position. At this time, the head of the front detector 7 is in a relatively lowered position or away from the front detection circuit board 13, and the front magnetic element 72 is away from the front sensing element 131; the head of the rear detector 8 is in a relatively lowered position or away from the rear detection circuit board 14, and the rear magnetic element 82 is away from the rear sensing element 141. When the yarn on the front feeding side breaks, the tail of the front probe rod 71 loses the yarn support and falls downward under its own weight. The front probe rod 71 rotates around the axis of the transverse rod at its head, causing the front magnetic element 72 to move upward towards the front detection circuit board 13 and enter the sensing area of ​​the front sensing element 131. The front sensing element 131 then outputs a yarn breakage signal. When the yarn at the front end is intact but the yarn at the rear end breaks, the tail of the rear probe rod 81 loses its yarn support and falls downward under its own weight. The rear probe rod 81 rotates around the axis of the transverse rod at its head, causing the rear magnetic element 82 to move upward toward the rear detection circuit board 14 and enter the sensing area of ​​the rear sensing element 141. The rear sensing element 141 then outputs a yarn breakage signal.

[0048] like Figure 3 , Figure 8 and Figure 9 As shown, a main circuit board 18 is housed inside the circuit base 6. The main circuit board 18 can be housed in the mounting cavity inside the circuit base 6 and fixed to the central mounting post of the housing 1 together with the circuit base 6 by fixing screws. Since the housing 1 is made of metal, the grounding terminal or conductive plane on the main circuit board 18 can be in close contact with the mounting post plane of the housing 1, so that the main circuit board 18 can further form an electrical connection with the knitting machine housing through the housing 1. The circuit base 6 is also provided with a contact pin 16 and a contact piece 17. One end of the contact pin 16 is used to connect to the external power cord or knitting machine control line, and the other end of the contact pin 16 abuts against the contact piece 17; the contact piece 17 further abuts against the main circuit board 18. Thus, the power or control signal from the knitting machine can be transmitted to the main circuit board 18 through the contact pin 16 and the contact piece 17.

[0049] Both the front detection circuit board 13 and the rear detection circuit board 14 are electrically connected to the main circuit board 18. Specifically, both the front detection circuit board 13 and the rear detection circuit board 14 are provided with support arms 19, which extend downwards and are used to install second spring elements 15. The second spring element 15 is sleeved and fixed on the support arm 19, with its upper end connected to the conductive part of the corresponding detection circuit board and its lower end elastically pressing against the conductive plane of the main circuit board 18. The front detection circuit board 13 can be provided with two support arms 19, each supporting one second spring element 15; the rear detection circuit board 14 can also be provided with two support arms 19, each supporting one supporting one spring element 15. The inner hole size of the second spring element 15 can be slightly smaller than the diagonal size of the lower end of the support arm 19, so that the second spring element 15 is not easy to fall off after being sleeved on the support arm 19, thereby facilitating assembly and improving connection reliability.

[0050] When the front detection circuit board 13 and the rear detection circuit board 14 move up and down under the action of the adjusting screw 9, the second spring element 15 can elastically compress or elastically extend in the height direction, and its lower end always elastically presses against the conductive plane of the main circuit board 18. Therefore, even if the distance between the front detection circuit board 13 and the rear detection circuit board 14 and the main circuit board 18 changes, the second spring element 15 can still maintain a stable electrical connection between the detection circuit board and the main circuit board 18. Compared with connectors and wire connections, this elastic conductive connection structure does not require a large additional wiring space, can adapt to the confined internal space of the circuit socket 6, and reduces problems such as loose wires, poor connector contact, and low assembly efficiency.

[0051] The electrical control path can be as follows: the power or control line from the knitting machine is input to the contact needle 16, the contact needle 16 contacts the contact piece 17, the contact piece 17 contacts the main circuit board 18, the main circuit board 18 is connected to the front detection circuit board 13 and the rear detection circuit board 14 respectively through the second spring element 15, the front detection circuit board 13 and the rear detection circuit board 14 are then connected back to the main circuit board 18 through the corresponding second spring element 15, and the main circuit board 18 is further connected to the knitting machine housing through contact with the metal housing 1, thus forming a circuit loop. The front detection circuit board 13 and the rear detection circuit board 14 can be connected in parallel. When the sensing element on any detection circuit board detects the corresponding magnetic element, the main circuit board 18 can output a stop signal.

[0052] A light guide post 20 is provided at the bottom of the circuit base 6. One end of the light guide post 20 corresponds to an indicator light on the main circuit board 18, and the other end extends or protrudes from the bottom outer side of the circuit base 6. When the main circuit board 18 receives a yarn breakage signal output by the front sensing element 131 or the rear sensing element 141, the main circuit board 18 controls the knitting machine to stop operating and illuminates the corresponding indicator light. The light emitted by the indicator light is conducted to the outside of the circuit base 6 through the light guide post 20, allowing the operator to visually observe the fault status from outside the yarn feeding device. This structure is particularly suitable for scenarios where multiple yarn feeding devices are set on the knitting machine, allowing the operator to quickly locate the location of the yarn breakage or abnormal yarn feeding based on the light from the light guide post 20.

[0053] Before use, the adjusting screws 9 corresponding to the front detection circuit board mounting base 11 and the rear detection circuit board mounting base 12 can be rotated respectively. When the front detection circuit board 13 is too far from the front magnetic element 72 and the detection is insensitive, the corresponding adjusting screw 9 can be screwed in to move the front detection circuit board 13 downwards, thereby reducing the sensing distance between the front sensing element 131 and the front magnetic element 72. When the front detection circuit board 13 is too close to the front magnetic element 72 and is prone to false triggering, the corresponding adjusting screw 9 can be unscrewed to push the front detection circuit board mounting base 11 upwards, thereby increasing the sensing distance. The sensing distance between the rear detection circuit board 14 and the rear magnetic element 82 is also adjusted independently in the same way. By independently adjusting the sensing distances of the front and rear paths, both the yarn infeed side and the yarn outfeed side can be kept in a stable detection state.

[0054] During operation, the drive belt on the knitting machine drives the drive pulley 3 to rotate, and the drive pulley 3 drives the yarn feed wheel 5 to rotate via the clutch 4 and the drive shaft 2. The yarn passes sequentially through the guide frame 21, the yarn pressing plate 22, the yarn knot filter 23, the front detector 7, the yarn inlet ceramic ring 24, the yarn feed wheel 5, the yarn outlet ceramic ring 25, and the rear detector 8 before being supplied to the knitting needles. Under normal yarn feeding conditions, the front detector 7 and the rear detector 8 are supported by the yarn, and their tails remain raised. The front magnetic element 72 is away from the front sensing element 131, and the rear magnetic element 82 is away from the rear sensing element 141. The main circuit board 18 does not output a yarn breakage stop signal. When the yarn at the front end of the yarn feed wheel 5 breaks, the tail of the front detector 7 loses its yarn support and falls. The front magnetic element 72 moves upward into the sensing area of ​​the front detection circuit board 13, triggering the front sensing element 131. The main circuit board 18 outputs a stop signal and illuminates the corresponding indicator light, and the light guide column 20 emits light. When the yarn at the rear end of the feed roller 5 breaks, the rear detector 8 loses its yarn support and falls. The rear magnetic element 82 moves upward into the sensing area of ​​the rear detection circuit board 14, triggering the rear sensing element 141. The main circuit board 18 outputs a shutdown signal and provides a fault indication through the light guide column 20.

[0055] The foregoing description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A knitting yarn feeding device, characterized in that, Includes a housing (1) and a drive shaft (2) that penetrates the housing (1) vertically. With the housing (1) as the boundary, the upper part of the drive shaft (2) is provided with a drive pulley (3) and a clutch (4) from top to bottom, and the lower part of the drive shaft (2) is provided with a wire feed wheel (5). The bottom of the housing (1) is equipped with a circuit base (6), and a detector assembly is integrated on the circuit base (6). The front detector (7) includes a front probe (71) and a front magnetic element (72) disposed at the head of the front probe (71). The front probe (71) is hinged to the circuit base (6) with its head. The front detection circuit board (13) is mounted on the front detection circuit board mounting base (11) and located above the front magnetic element (72). The front detection circuit board (13) is provided with a front sensing element (131). When the tail of the front probe (71) falls down, the front magnetic element (72) moves upward into the sensing area of ​​the front sensing element (131). The rear detector (8) includes a rear probe rod (81) and a rear magnetic element (82) disposed at the head of the rear probe rod (81). The rear probe rod (81) is hinged to the circuit base (6) with its head. The rear detection circuit board (14) is mounted on the rear detection circuit board mounting base (12) and located above the rear magnetic element (82). The rear detection circuit board (14) is provided with a rear sensing element (141). When the tail of the rear probe rod (81) falls down, the rear magnetic element (82) moves upward into the sensing area of ​​the rear sensing element (141). The front detector (7) and the rear detector (8) are located on the same side of the circuit base (6), and the front detector (7) and the rear detector (8) are installed at different heights. The circuit base (6) is provided with two guide holes (61) extending in the vertical direction. The front detection circuit board mounting base (11) and the rear detection circuit board mounting base (12) are respectively provided with hollow support columns (62) extending into the corresponding guide holes (61). Each support column (62) is provided with a nut (10) and a first spring element (64) located below the nut (10). The nut (10) is restricted in the support column (62) and cannot rotate relative to the support column (62). The bottom of the guide hole (61) is provided with a screw hole (63). The adjusting screw (9) passes through the screw hole (63) and the hollow part of the first spring element (64) from below the circuit base (6) and screws into the nut (10). The nut (10) is provided with an anti-loosening element (101) to restrict the loosening of the adjusting screw (9), so that the front detection circuit board (13) and the rear detection circuit board (14) can be adjusted up and down relative to the corresponding magnetic elements respectively. The circuit base (6) is equipped with a main circuit board (18). The front detection circuit board (13) and the rear detection circuit board (14) are each equipped with at least two second spring elements (15). One end of each second spring element (15) is connected to the corresponding detection circuit board, and the other end elastically abuts against the conductive surface of the main circuit board (18). The elastic deformation direction of the second spring element (15) is consistent with the movement direction of the support column (62) in the guide hole (61).

2. The knitting yarn feeding device according to claim 1, characterized in that, The circuit base (6) is provided with two sets of hinged fixing positions. Each set of hinged fixing positions includes corresponding U-shaped grooves (65) respectively opened on both sides of the circuit base (6). The openings of the U-shaped grooves (65) face upward. The transverse rod of the head of the front probe (71) is installed in one set of U-shaped grooves (65), and the transverse rod of the head of the rear probe (81) is installed in the other set of U-shaped grooves (65).

3. The knitting yarn feeding device according to claim 1, characterized in that, The front probe (71) has a detachable horizontal bar at the head of the front magnetic element seat (73), and the front magnetic element seat (73) cannot rotate around the horizontal bar at the head; the front magnetic element seat (73) is provided with a cylindrical space area for accommodating the front magnetic element (72), and the front magnetic element (72) is embedded and fixed in the space area. The head transverse rod of the rear probe (81) is detachably fixed with a rear magnetic element seat (83), and the rear magnetic element seat (83) cannot rotate around the head transverse rod; the rear magnetic element seat (83) is provided with a cylindrical space area for accommodating the rear magnetic element (82), and the rear magnetic element (82) is embedded and fixed in the space area.

4. A knitting yarn feeding device according to claim 3, characterized in that, The head of the front probe (71) extends outward to form a frame-shaped fixing area. The front magnetic element seat (73) is provided with a first opening fixing groove (731) that is compatible with it. The frame-shaped fixing area is embedded in the first opening fixing groove (731) to fix the front probe (71) and the front magnetic element seat (73). The head of the rear probe (81) extends outward to form a frame-shaped fixing area. The rear magnetic element seat (83) is provided with a second opening fixing groove (831) that is compatible with it. The frame-shaped fixing area is embedded in the second opening fixing groove (831) to fix the rear probe (81) and the rear magnetic element seat (83).

5. A knitting yarn feeding device according to claim 1, characterized in that, The front detection circuit board (13) is fixed on the circuit base (6) by the front detection circuit board mounting base (11). Each side of one side of the front detection circuit board mounting base (11) is provided with a buckle (112), and the two sides of the front detection circuit board (13) are fastened and limited by the buckles (112). The rear detection circuit board (14) is fixed on the circuit base (6) by the rear detection circuit board mounting base (12). Each side of one side of the rear detection circuit board mounting base (12) is provided with a buckle (112), and the two sides of the rear detection circuit board (14) are fastened and limited by the buckles (112).

6. A knitting yarn feeding device according to claim 1, characterized in that, The circuit socket (6) is also provided with a contact pin (16) and a contact piece (17); the contact pin (16) abuts against the contact piece (17), and the contact piece (17) abuts against the main circuit board (18); The shell (1) is made of metal and is electrically conductive; The stylus (16), contact plate (17), main circuit board (18), second spring element (15), front detection circuit board (13), rear detection circuit board (14) and housing (1) constitute part of the circuit loop.

7. A knitting yarn feeding device according to claim 1, characterized in that, Both the front detection circuit board (13) and the rear detection circuit board (14) are provided with support arms (19), and the second spring element (15) is sleeved and fixed on the support arm (19).

8. A knitting yarn feeding device according to claim 1, characterized in that, Both the front sensing element (131) and the rear sensing element (141) are reed switches, with the reed switch contacts located inside the glass tube.

9. A knitting yarn feeding device according to claim 1, characterized in that, The bottom of the circuit base (6) is provided with a light guide column (20), one end of which corresponds to the indicator light on the main circuit board (18), and the other end is exposed on the outer side of the bottom of the circuit base (6).

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