Needle bending device and overlock machine

Abstract

The application relates to the technical field of sewing equipment, in particular to a curved needle device and an overlock machine. The curved needle device comprises a driving piece, an upper curved needle mechanism and a lower curved needle mechanism. The upper curved needle mechanism comprises an upper curved needle and a first transmission piece, the first transmission piece is in transmission connection with the upper curved needle, the lower curved needle mechanism comprises a lower curved needle and a second transmission piece, the second transmission piece is in transmission connection with the lower curved needle, the driving piece is in transmission connection with the first transmission piece and the second transmission piece, is used for driving the first transmission piece and the second transmission piece to move, and drives the upper curved needle to swing and the lower curved needle to swing respectively. The overlock machine comprises a needle bar device and the curved needle device. The application realizes separate driving of the curved needle device and the needle bar device, adjusts the phase of the curved needles and the phase matching of the curved needles and the machine needles through driving control of the driving piece.

Description

Technical Field

[0001] This application relates to the field of sewing equipment technology, and in particular to a looper device and an overlock sewing machine. Background Technology

[0002] Overlock sewing machines, also known as sergers, are specialized sewing equipment used in the garment industry. They simultaneously cut the raw edges of fabric and tightly wrap the edges with multiple threads to prevent the fabric fibers from fraying or fraying. The looper mechanism of an overlock sewing machine is the core oscillating mechanism that works in conjunction with the needle to complete the chain stitch. The overlock sewing machine relies on the back-and-forth oscillation of the upper and lower loopers to hook the threads together, which, in conjunction with the straight needle, forms a mesh-like chain stitch.

[0003] Existing overlock sewing machines generally use a crankshaft connecting rod mechanism to rigidly couple and drive the needle bar mechanism and the looper mechanism. The timing of the movement of the needle and looper is entirely determined by the mechanical phase of the crankshaft. When adjusting the phase matching of this structure, it is necessary to rely on the tooling positioning block to repeatedly adjust the installation position to adjust the timing, resulting in low adjustment accuracy, time-consuming adjustment, and assembly errors that can easily lead to unsightly stitches, skipped stitches, or broken threads. Summary of the Invention

[0004] Therefore, it is necessary to provide a looper device and an overlock sewing machine that can easily adjust the phase coordination between the looper and the sewing needle.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] A needle bending device includes a driving member, an upper needle bending mechanism, and a lower needle bending mechanism. The upper needle bending mechanism includes an upper needle and a first transmission member connected to the upper needle. The lower needle bending mechanism includes a lower needle and a second transmission member connected to the lower needle. The driving member is tractively connected to the first and second transmission members and is used to drive the first and second transmission members to move. The first and second transmission members respectively drive the upper needle to swing and the lower needle to swing.

[0007] It is understandable that the driving component is connected to the first and second transmission components to drive their movement, which in turn drives the upper and lower looper to swing. Therefore, the driving component independently drives the upper and lower looper mechanisms, i.e., it is configured separately from the needle bar device. This achieves separate driving of the looper device and the needle bar device, changing the existing overlock sewing machine structure that uses a crankshaft connecting rod mechanism to rigidly couple the needle bar and looper mechanism. This allows timing adjustment to change from relying on repeated tooling adjustments to adjusting the installation position to adjusting the phase between loopers and the phase coordination between the looper and the needle through the driving control of the driving component. The timing matching adjustment becomes more intelligent and precise, enabling faster adjustment to produce perfect and stable stitches.

[0008] In one embodiment, the drive unit includes a first motor and a second motor, wherein the output shaft of the first motor is connected to the input end of the first transmission unit, and the output shaft of the second motor is connected to the input end of the second transmission unit.

[0009] Understandably, the upper looper is driven independently by the first motor, and the lower looper is driven independently by the second motor, achieving decoupling of the upper and lower looper movements. Their swing amplitude and phase can be adjusted independently. The swing angle, swing start phase, and movement speed of the upper looper can be modified separately without altering the lower looper mechanism; conversely, the same applies. Therefore, the timing of the upper and lower loopers can be flexibly adjusted, easily adapting to various overlock sewing techniques such as three-thread, four-thread, and five-thread stitching.

[0010] In one embodiment, the upper bending needle mechanism further includes a first swing rod and a guide seat. The guide seat has a guide hole, the first swing rod passes through the guide hole and can swing along the guide hole. The first end of the first swing rod is connected to the upper bending needle, and the second end of the first swing rod is connected to the output end of the first transmission member.

[0011] Understandably, the guide hole of the guide seat is used to radially limit the first swing arm, so that the first swing arm can only swing back and forth along the preset trajectory, effectively suppressing the radial movement of the first swing arm, ensuring that the swing trajectory of the upper looper is accurate and controllable, the needle tip does not shake during high-speed sewing, the stitch is stable, and the skipped stitch fault is reduced.

[0012] In one embodiment, the first transmission element is configured as a first linkage mechanism.

[0013] Understandably, the motor outputs continuous rotary motion, and the curved needle needs to oscillate back and forth in an arc. The linkage mechanism can smoothly convert the input rotary motion into reciprocating oscillating motion, precisely matching the periodic reciprocating hooking motion requirements of the curved needle. The motion pattern is controllable and can strictly match the needle bar's needle drop sequence, avoiding hooking misalignment and skipped stitches.

[0014] In one embodiment, the first linkage mechanism includes a first cam link, a first intermediate link, a first rotating shaft, and a first output link. The cam end of the first cam link is fixed to the output shaft of the first motor, and the link end is hinged to the first end of the first intermediate link. The second end of the first intermediate link is fixed to the first rotating shaft. The first end of the first output link is fixed to the first rotating shaft, and the second end is hinged to the second end of the first rocker arm.

[0015] Understandably, the first motor drives the first cam connecting rod to rotate back and forth, which in turn drives the first intermediate connecting rod to swing back and forth through the hinge, thereby driving the first rotating shaft to rotate back and forth, and then driving the first output connecting rod to rotate back and forth, thus driving the first rocker arm to swing.

[0016] In one embodiment, the second transmission element is configured as a second linkage mechanism.

[0017] Understandably, similar to the first linkage mechanism, the second linkage mechanism can smoothly convert the input rotary motion into reciprocating oscillating motion, accurately matching the periodic reciprocating hooking motion requirements of the lower looper. The motion pattern is controllable, and it can strictly match the timing of the needle bar's needle drop, avoiding hooking misalignment and skipped stitches.

[0018] In one embodiment, the second linkage mechanism includes a second cam link, a second intermediate link, and a second rotating shaft. The cam end of the second cam link is fixed to the output shaft of the second motor, and the link end is hinged to the first end of the second intermediate link. The second end of the second intermediate link is fixed to the second rotating shaft, and the second rotating shaft is fixed to the first end of the lower bent needle.

[0019] Understandably, the second motor drives the second cam connecting rod to rotate back and forth, which in turn drives the second intermediate connecting rod to swing back and forth through the hinge, and drives the second rotating shaft to rotate back and forth. Finally, the second rotating shaft drives the lower bending needle to swing.

[0020] In one embodiment, the driving component includes a motor, the first transmission component includes a first transmission shaft, the second transmission component includes a second transmission shaft, one of the first transmission shaft and the second transmission shaft is connected to the output shaft of the motor, and a transmission structure is provided between the first transmission shaft and the second transmission shaft.

[0021] Understandably, compared to setting two motors to drive the upper and lower bending mechanisms independently, one motor can be reduced, thus lowering costs.

[0022] This application also provides the following technical solutions:

[0023] An overlock sewing machine, including the aforementioned looper device.

[0024] In one embodiment, the needle bar device includes a spindle motor and a needle bar mechanism, wherein the spindle motor is connected to the needle bar mechanism for driving the needle bar mechanism to move.

[0025] Compared with the prior art, in the overlock sewing machine of this application, the looper device is equipped with a separate drive component, realizing the separate driving of the looper device and the needle bar device. This changes the structure of the existing overlock sewing machine, which uses a crankshaft connecting rod mechanism to rigidly couple the needle bar and the looper mechanism. This allows the timing adjustment to change from relying on repeated debugging of the tooling position to adjusting the phase between loopers and the phase matching between the looper and the needle through the drive control of the drive component. The timing matching adjustment becomes more intelligent and precise, and can more quickly adjust to produce perfect and stable stitches. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural diagram of the bending needle device provided in this application;

[0028] Figure 2 This is a side view of the bending needle device provided in this application;

[0029] Figure 3 It is a diagram showing the positions of the upper looper, lower looper, and machine needle as they hook and unslip.

[0030] Figure 4 It is a diagram showing the trajectory of adjusting the looper when using different sewing materials.

[0031] The component labels are as follows:

[0032] 100. Needle bending device; 10. Drive component; 11. First motor; 111. First mounting base; 112. First mounting plate; 12. Second motor; 121. Second mounting base; 122. Second mounting plate; 20. Upper needle bending mechanism; 21. First cam connecting rod; 22. First intermediate connecting rod; 23. First rotating shaft; 231. First support base; 24. First output connecting rod; 25. First rocker arm; 26. Guide seat; 261. Guide hole; 262. Mounting hole; 27. Upper needle bending; 30. Lower needle bending mechanism; 31. Second cam connecting rod; 32. Second intermediate connecting rod; 33. Second rotating shaft; 331. Second support base; 34. Lower needle bending; 341. Needle bending body; 342. Connecting rod part. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0038] In existing overlock sewing machines, a crankshaft connecting rod mechanism is used to rigidly couple and drive the needle bar and the looper mechanism. The movement sequence of the needle and looper is entirely determined by the mechanical phase of the crankshaft, making precise adjustment impossible. This application provides a looper device 100 for separating the driving of the looper and the needle bar, thereby enabling full-parameter, high-precision, and dynamic coordinated control of the looper and the movement sequence of the looper and the needle.

[0039] Specifically, please refer to Figures 1 to 4The needle bending device 100 includes a driving member 10, an upper needle bending mechanism 20, and a lower needle bending mechanism 30. The upper needle bending mechanism 20 includes an upper needle 27 and a first transmission member connected to the upper needle 27. The lower needle bending mechanism 30 includes a lower needle 34 and a second transmission member connected to the lower needle 34. The driving member 10 is connected to the first and second transmission members for driving the first and second transmission members to move. The first and second transmission members respectively drive the upper needle 27 to swing and the lower needle 34 to swing.

[0040] Here, the drive unit 10 is connected to the first and second transmission units, driving their movement. The first and second transmission units, in turn, drive the upper looper 27 and lower looper 34 to swing, respectively, spatially interacting with the needle on the needle bar mechanism driven by the main shaft motor to form a stitch. Therefore, the drive unit 10 independently drives the upper looper mechanism 20 and the lower looper mechanism 30, i.e., it is configured independently of the needle bar device. This changes the existing overlock sewing machine structure that uses a crankshaft connecting rod mechanism to rigidly couple the needle bar and looper mechanism, allowing timing adjustment to change from relying on repeated tooling adjustments to adjusting the installation position to controlling the drive unit 10 to adjust the phase between the upper and lower loopers and the phase coordination between the looper and the needle. This makes timing matching adjustment more intelligent and precise, enabling faster adjustment to produce perfectly stable stitches. This invention solves the phase matching difficulties caused by the rigid coupling drive between the looper mechanisms and between the looper and the needle bar mechanism in existing overlock sewing machines, which relies on the crankshaft and connecting rod. It avoids the cumbersome, inefficient, inaccurate, and unstable drawbacks of traditional methods that require repeated disassembly and reassembly of mechanical tooling and adjustment of installation positions to achieve timing matching. It eliminates the looper mechanism's dependence on the main shaft's mechanical transmission, enabling full-parameter, high-precision, and dynamically programmable collaborative control of the looper and its movement sequence with the needle. This overcomes the bottleneck of mechanical debugging and yields stable, adaptive overlock stitches.

[0041] Please see Figure 3 This is a schematic diagram showing the interlocking and unhooking positions of the upper looper 27, lower looper 34, and the machine needle. The upper looper 27 and lower looper 34 work in conjunction with the machine needle to complete the chain stitch. Coordinated control of the movement sequence of the upper looper 27 and lower looper 34, as well as between the upper looper 27, lower looper 34, and the machine needle, is required. Please refer to [link / reference]. Figure 4 Different looper hooks and trajectories are designed for different sewing materials, such as regular material, thin material, and thick material (the thickness of regular material, thin material, and thick material can be predefined). By controlling the drive component 10 to adjust the phase between loopers and the phase coordination between loopers and the machine needle, the designed looper hooks and trajectories can be realized.

[0042] In one embodiment, the drive unit 10 includes a first motor 11 and a second motor 12. The output shaft of the first motor 11 is connected to the input end of the first transmission component, and the output shaft of the second motor 12 is connected to the input end of the second transmission component. By controlling the first motor 11 and the second motor 12, the phase of the upper bend 27 and the lower bend 34 is actively programmed and adjusted throughout their entire motion cycle (e.g., real-time phase angle shift, dynamic speed change, etc.). This achieves independent modular drive for the bend device 100 and allows direct application to a series of products, significantly shortening the development cycle of these products.

[0043] Understandably, the upper looper 27 is driven independently by the first motor 11, and the lower looper 34 is driven independently by the second motor 12, achieving decoupling of the movements of the upper and lower loopers 34. The independent first motor 11 and second motor 12 drive the upper looper mechanism 20 and the lower looper mechanism 30 respectively, which are then phase-matched with the needle bar mechanism driven by the main spindle motor, forming overlock stitches when running synchronously. The swing amplitude and movement phase of the upper looper 27 and the lower looper 34 can be adjusted independently. The swing angle, swing start phase, and movement speed of the upper looper 27 can be modified independently without altering the lower looper mechanism 30; conversely, the timing of the upper and lower loopers 34 can be flexibly adjusted to easily adapt to various overlock processes such as three-thread, four-thread, and five-thread stitching. During the mechanical assembly of the machine or when subsequent garment production processes require adjustments to the phase difference between the upper looper 27 and the lower looper 34, as well as between the looper and the needle, only the phase parameters of each looper drive motor need to be adjusted through the operating interface.

[0044] Preferably, both the first motor 11 and the second motor 12 can be permanent magnet synchronous servo motors. An integrated encoder provides closed-loop position control, ensuring high angular positioning accuracy. The swing phases of the upper bend needle 27 and the lower bend needle 34 are precisely synchronized with the needle bar spindle, preventing step loss during long-term high-speed operation and eliminating thread misalignment. Real-time angle following is supported, allowing for real-time correction of the timing of the upper and lower bend needles 34, and easy switching between three-, four-, and five-thread stitches.

[0045] In another embodiment, the driving component 10 includes a motor, the first transmission component includes a first transmission shaft, and the second transmission component includes a second transmission shaft. One of the first and second transmission shafts is connected to the output shaft of the motor, and a transmission structure is provided between the first and second transmission shafts. Here, the transmission structure can be a synchronous belt drive or a gear drive. By cooperating with the transmission structure, one motor can simultaneously drive both the upper bend needle mechanism 20 and the lower bend needle mechanism 30. Compared to using two motors to independently drive the upper bend needle mechanism 20 and the lower bend needle mechanism 30, one motor can be reduced, thus lowering costs.

[0046] In one embodiment, the upper bending needle mechanism 20 further includes a first swing rod 25 and a guide seat 26. The guide seat 26 is fixedly disposed and has a mounting hole 262 for mounting and fixing. In addition, the guide seat 26 has a guide hole 261. The first swing rod 25 passes through the guide hole 261 and can swing along the guide hole 261. The first end of the first swing rod 25 is connected to the upper bending needle 27, and the second end of the first swing rod 25 is connected to the output end of the first transmission member.

[0047] It is understandable that the guide hole 261 of the guide seat 26 is used to radially limit the first swing rod 25, so that the first swing rod 25 can only swing back and forth along the preset trajectory, effectively suppressing the radial movement of the first swing rod 25, ensuring that the swing trajectory of the upper curved needle 27 is accurate and controllable, the needle tip does not shake during high-speed sewing, the stitch is stable, and the skipped stitch fault is reduced.

[0048] Specifically, the first swing arm 25 is a cylindrical rod, and the guide hole 261 extends through both ends axially, allowing the first swing arm 25 to pass through. The radial cross-section of the guide hole 261 is elongated, such as oblong, providing space for the swing of the first swing arm 25. Furthermore, the gap between the two side walls of the guide hole 261 and the first swing arm 25 is small, which can limit the radial sides of the first swing arm 25, thus allowing the first swing arm 25 to move and swing axially within the guide hole 261.

[0049] Furthermore, the first end of the first swing arm 25 is provided with an open clamping groove, and the upper curved needle 27 is provided with a fixing part. The fixing part is flat and square, which can effectively clamp and fix it in the clamping groove. The two side walls of the opening part of the clamping groove are fixed by bolts to fix the fixing part in the clamping groove. The upper curved needle 27 can be replaced as needed.

[0050] In one embodiment, the first transmission component is configured as a first linkage mechanism. The motor outputs continuous rotary motion, and the curved needle needs to reciprocate in an arc. The linkage mechanism can smoothly convert the input rotary motion into reciprocating oscillating motion, accurately matching the periodic reciprocating hooking action requirements of the curved needle 27. The motion pattern is controllable, and it can strictly match the needle bar's needle drop sequence to avoid hooking misalignment and skipped stitches.

[0051] Specifically, the first linkage mechanism includes a first cam link 21, a first intermediate link 22, a first rotating shaft 23, and a first output link 24. The cam end of the first cam link 21 is fixed to the output shaft of the first motor 11, and the link end is hinged to the first end of the first intermediate link 22. The second end of the first intermediate link 22 is fixed to the first rotating shaft 23. The first end of the first output link 24 is fixed to the first rotating shaft 23, and the second end is hinged to the second end of the first rocker arm 25. One end of the first cam link 21 is a cam end, and the other end is a link end. The cam end is disc-shaped and has a central protrusion on one axial side. The central hole on the central protrusion is fixed to the output shaft of the first motor 11, for example, by radial screw locking. The link end is connected to the cam end and extends along the length of the first cam link 21. The first intermediate connecting rod 22 is relatively short, long enough to allow for hinged connection with the first cam connecting rod 21 and fixed connection with the first rotating shaft 23. The connecting rod ends of the first intermediate connecting rod 22 and the first cam connecting rod 21 are hinged via pins. The first intermediate connecting rod 22 has a clamping part, which is fixed to the first rotating shaft 23. The first output connecting rod 24 has a clamping part at its first end, which is fixed to the first rotating shaft 23. The second end of the first output connecting rod 24 has a hinged part, and the second end of the first swing rod 25 has a hinged groove. The hinged part is located in the hinged groove and is hinged to the hinged groove via a pin. The first motor 11 drives the first cam connecting rod 21 to reciprocate (oscillate), which in turn drives the first intermediate connecting rod 22 to reciprocate, causing the first rotating shaft 23 to reciprocate, which in turn drives the first output connecting rod 24 to reciprocate, thereby driving the first swing rod 25 to oscillate. Furthermore, the first linkage mechanism can optimize the overall layout of the machine, enabling the first motor 11 to be arranged at the far end, thus avoiding motion interference with the lower bending needle mechanism 30.

[0052] Here, the cam end of the first cam link 21 can be mounted on the output shaft of the first motor 11. (See also...) Figure 1 The output shaft of the first motor 11, at the end furthest from the motor body, is rotatably supported on the first mounting base 111. Alternatively, the cam end of the first cam connecting rod 21 is mounted on a camshaft, and the camshaft is connected to the output shaft of the first motor 11 via a coupling. Furthermore, the first motor 11 is mounted on the first mounting plate 112, and the first rotating shaft 23 is rotatably mounted on the first support base 231. The first support base 231 can be a bearing housing, supporting the first rotating shaft 23 via a rotating bearing.

[0053] In one embodiment, the second transmission component is configured as a second linkage mechanism. Similar to the first linkage mechanism, the second linkage mechanism can smoothly convert the input rotary motion into reciprocating oscillating motion, accurately matching the periodic reciprocating hooking action requirements of the lower looper 34. The motion pattern is controllable, and it can strictly match the needle bar's needle drop sequence to avoid hooking misalignment and skipped stitches.

[0054] Specifically, the second linkage mechanism includes a second cam link 31, a second intermediate link 32, and a second rotating shaft 33. The cam end of the second cam link 31 is fixed to the output shaft of the second motor 12, and the link end is hinged to the first end of the second intermediate link 32. The second end of the second intermediate link 32 is fixed to the second rotating shaft 33, and the first end of the lower bent needle 34 is fixed to the second rotating shaft 33. One end of the second cam link 31 is a cam end, and the other end is a link end. The cam end is disc-shaped and has a central protrusion on one axial side. The central hole on the central protrusion is fixed to the output shaft of the second motor 12, for example, by radial screw locking. The link end connects to the cam end and extends along the length of the second cam link 31. The second intermediate link 32 is relatively short, long enough to achieve hinge connection with the second cam link 31 and fixation with the second rotating shaft 33. The lower bent needle 34 has a clamping part, which is fixed to the second rotating shaft 33. The second motor 12 drives the second cam link 31 to reciprocate (oscillate), which in turn drives the second intermediate link 32 to reciprocate and oscillate, thereby driving the second rotating shaft 33 to reciprocate and rotate. Finally, the second rotating shaft 33 drives the lower bending needle 34 to oscillate. Furthermore, the second linkage mechanism can optimize the overall layout of the machine, allowing the second motor 12 to be positioned at a remote end, thus avoiding motion interference with the upper bending needle mechanism 20.

[0055] The design of the first and second linkage mechanisms is beneficial for optimizing the overall machine layout. Please refer to [link / reference]. Figure 1 The first motor 11 and the second motor 12 are arranged side by side, in a front-to-back direction. The upper bend 27 and the lower bend 34 are in front of the first motor 11 and the second motor 12, with the second motor 12 in front and closer to the bend. The first cam link 21 and the second cam link 31 are axially offset, and the first rotating shaft 23 and the second rotating shaft 33 are axially offset, with the second rotating shaft 33 in front. The first output link 24, the lower bend 34, and the first cam link 21 are axially offset. Therefore, the first motor 11, the second motor 12, and the first and second linkage mechanisms achieve an optimized layout within a compact space.

[0056] Here, the cam end of the second cam link 31 can be mounted on the output shaft of the second motor 12. (See also...) Figure 1 The output shaft of the second motor 12, at the end furthest from the motor body, is rotatably supported on the second mounting base 121. Alternatively, the cam end of the second cam connecting rod 31 is mounted on a camshaft, and the camshaft is connected to the output shaft of the second motor 12 via a coupling. Furthermore, the second motor 12 is mounted on the second mounting plate 122, and the second rotating shaft 33 is rotatably mounted on the second support base 331. The second support base 331 can be a bearing housing, supporting the second rotating shaft 33 through the rotation of the bearing.

[0057] In one embodiment, the lower bend 34 includes a bend body 341 and a connecting rod 342, with the connecting rod 342 fixed to the second rotating shaft 33. The bend body 341, which performs the hooking action, and the connecting rod 342, which is hinged for transmission, are integrated into a single structure, eliminating the need for additional connecting parts. Furthermore, this integrated structure offers greater rigidity, making it less prone to deformation under high-speed reciprocating oscillations and frequent reversing impact loads, resulting in better fatigue resistance and a longer service life. The connecting rod 342 can be designed with angles or bends to ensure the working position of the bend body 341 while maintaining its connection to the second rotating shaft 33.

[0058] This application also provides the following technical solution: an overlock sewing machine, including a needle bar device and a bent needle device 100 in any of the above embodiments.

[0059] The structure of the needle bar device can refer to existing technology, including a spindle motor and a needle bar mechanism. The spindle motor is connected to the needle bar mechanism for driving the movement of the needle bar mechanism.

[0060] Therefore, both the needle bending device 100 and the needle bar device are independently driven. In the needle bar device, the needle bar is independently driven by the main spindle motor. In the needle bending device 100, the upper needle bending 27 is driven independently by the first motor 11, and the lower needle bending 34 is driven independently by the second motor 12. By independently adjusting the first motor 11, the second motor 12, and the main spindle motor, the movement sequence of the upper needle bending 27 and the lower needle bending 34 is adjusted, and the movement sequence of the needle bar and the needle bending is matched, resulting in more precise and faster adjustment.

[0061] The bend-over device 100 is driven by an independent motor and uses electronic phase synchronization control as its core logic. It breaks through the mechanical timing lock-in inertia that has been used in the sewing machine field for a long time, and realizes the essential transformation of motion timing from "fixed mechanical relationship" to "programmable electronic control relationship". It not only supports arbitrary and precise setting and real-time dynamic correction of the phase of the bend-over and the needle, but also lays the foundation for the control architecture of intelligent machine and digital closed-loop control of process parameters.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A needle bending device, characterized in that, The device includes a drive unit (10), an upper bend needle mechanism (20), and a lower bend needle mechanism (30). The upper bend needle mechanism (20) includes an upper bend needle (27) and a first transmission member connected to the upper bend needle (27). The lower bend needle mechanism (30) includes a lower bend needle (34) and a second transmission member connected to the lower bend needle (34). The drive unit (10) is connected to the first and second transmission members to drive the first and second transmission members to move. The first and second transmission members respectively drive the upper bend needle (27) to swing and the lower bend needle (34) to swing.

2. The needle bending device according to claim 1, characterized in that, The drive unit (10) includes a first motor (11) and a second motor (12). The output shaft of the first motor (11) is connected to the input end of the first transmission unit, and the output shaft of the second motor (12) is connected to the input end of the second transmission unit.

3. The needle bending device according to claim 2, characterized in that, The upper bending needle mechanism (20) further includes a first swing rod (25) and a guide seat (26). The guide seat (26) is provided with a guide hole (261). The first swing rod (25) passes through the guide hole (261) and can swing along the guide hole (261). The first end of the first swing rod (25) is connected to the upper bending needle (27), and the second end of the first swing rod (25) is connected to the output end of the first transmission member.

4. The needle bending device according to claim 3, characterized in that, The first transmission component is configured as a first linkage mechanism.

5. The needle bending device according to claim 4, characterized in that, The first linkage mechanism includes a first cam link (21), a first intermediate link (22), a first rotating shaft (23), and a first output link (24). The cam end of the first cam link (21) is fixed to the output shaft of the first motor (11), and the link end is hinged to the first end of the first intermediate link (22). The second end of the first intermediate link (22) is fixed to the first rotating shaft (23). The first end of the first output link (24) is fixed to the first rotating shaft (23), and the second end is hinged to the second end of the first rocker arm (25).

6. The needle bending device according to claim 2, characterized in that, The second transmission component is configured as a second linkage mechanism.

7. The needle bending device according to claim 6, characterized in that, The second linkage mechanism includes a second cam link (31), a second intermediate link (32), and a second rotating shaft (33). The cam end of the second cam link (31) is fixed to the output shaft of the second motor (12), and the link end is hinged to the first end of the second intermediate link (32). The second end of the second intermediate link (32) is fixed to the second rotating shaft (33), and the second rotating shaft (33) is fixed to the first end of the lower bent needle (34).

8. The needle bending device according to claim 1, characterized in that, The drive component (10) includes a motor, the first transmission component includes a first transmission shaft, the second transmission component includes a second transmission shaft, one of the first transmission shaft and the second transmission shaft is connected to the output shaft of the motor, and a transmission structure is provided between the first transmission shaft and the second transmission shaft.

9. An overlock sewing machine, characterized in that, Includes a needle bar assembly and a bending needle assembly (100) as described in any one of claims 1 to 8.

10. The overlock sewing machine according to claim 9, characterized in that, The needle bar device includes a spindle motor and a needle bar mechanism. The spindle motor is connected to the needle bar mechanism for driving the movement of the needle bar mechanism.

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