Reset structure of shuttle shifting device

Abstract

The utility model provides a shuttle shifter reset structure, which relates to the technical field of shuttle shifters and comprises a sewing machine table and a rotating shuttle seat arranged inside the sewing machine table. The rotating shuttle seat is used for supporting the whole structure and is internally provided with a reset mounting cavity; one end of the rotating shuttle driving shaft is rotationally connected into the rotating shuttle seat; the top of the rotary reset column is fixedly connected with the poke rod, and the bottom is rotatably mounted in the rotating shuttle seat; the rotating cam is connected to the rotating shuttle driving shaft, and the protruding end is in dynamic contact with the swing mechanism. One end of the swing mechanism abuts against the rotating cam, and the other end of the swing mechanism is matched with the reset mechanism. The reset mechanism is mounted in the reset mounting cavity, and a reset force is applied to the swing mechanism through a magnetic structure, so that the problems that a spring reset mechanism adopted for resetting of an existing shuttle shifting device is prone to fatigue, the reset force is attenuated after long-term use, and a gravity reset mechanism is only suitable for a low-speed loom; and the requirement for machining and assembling precision is high, and the cost is high.

Description

Technical Field

[0001] This utility model mainly relates to the field of shuttle technology, specifically to a shuttle reset structure. Background Technology

[0002] In sewing equipment, the shuttle, as the core component controlling the movement of the rotary hook, directly affects the stitch quality and sewing efficiency. The reliability of its reset mechanism directly impacts sewing quality and equipment stability. Currently, shuttle reset generally employs a spring reset mechanism, with one end of a tension or compression spring fixed to the frame and the other end connected to the shuttle arm or connecting rod. The working surface of the cam pushes the shuttle to swing, while the non-working surface (return section) relies on spring tension or pressure for reset. The working principle is that when the cam rotates to its highest point, it compresses (or stretches) the spring to store energy; when the cam turns to its lowest point, the spring releases energy, pulling the shuttle back to its original position. However, this method is prone to spring fatigue, and the reset force diminishes after long-term use, leading to inaccurate reset. Another method uses a gravity reset mechanism, which balances the shuttle arm's reset side using gravitational torque by installing a counterweight. The tilted cam track works in conjunction with gravity to achieve reset, but this method is only suitable for low-speed looms. At high speeds, inertial forces will interfere with the effect of gravity. Another method uses a double cam or conjugate cam mechanism, which uses two cams that rotate synchronously to control the forward swing and reverse reset of the shuttle respectively. This method has a complex structure, requires high precision in processing and assembly, and the cams need to be replaced in pairs after wear, resulting in high costs.

[0003] It should be noted that the above content falls within the scope of technical knowledge of those skilled in the art. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art. Utility Model Content

[0004] 1. The technical problem to be solved by the utility model:

[0005] This utility model provides a shuttle reset structure to solve the technical problems existing in the background art.

[0006] 2. Technical Solution:

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows: a shuttle reset structure, including a sewing machine table, wherein a rotary shuttle seat is provided inside the sewing machine table;

[0008] The rotary hook base, with the rotary hook assembly connected to the top, is used to support the overall structure and has a reset mounting cavity inside.

[0009] The shuttle drive shaft is connected to an external drive source at one end and rotatably connected to the inside of the shuttle base at the other end, and is equipped with a lubrication structure to reduce friction.

[0010] The rotating reset column is fixedly connected to the top of the actuating rod and rotatably mounted in the rotary hook seat at the bottom via a bearing. It is equipped with an axial preload mechanism to ensure stable transmission.

[0011] The rotating cam is fixedly connected to the shuttle drive shaft. Its profile adopts an optimized curve design, and the protruding end maintains dynamic contact with the swing mechanism.

[0012] The swing mechanism is hinged in the middle to the rotating reset column, with one end abutting against the rotating cam and the other end cooperating with the reset mechanism. Its structure uses lightweight and high-strength materials to improve the response speed.

[0013] A reset mechanism is installed in the reset mounting cavity. It applies a reset force to the swing mechanism through a magnetic structure to ensure that the swing mechanism is always in close contact with the rotating cam.

[0014] In this embodiment, the other structures of the device adopt the existing technology of sewing machines, which will not be described in detail here. The rotary hook seat is made of high-strength aluminum alloy or ductile iron and has a precision-machined reset mounting cavity inside to ensure accurate matching of the reset mechanism. The rotary hook drive shaft is supported in the rotary hook seat by bearings and has an oil passage at its end, which can be periodically lubricated to reduce friction loss. The bottom of the rotating reset column is mounted in the rotary hook seat by bearings.

[0015] The rotating cam is made of hardened alloy steel, and its profile curve is optimized based on kinematic simulation to ensure uniform distribution of contact pressure with the swing mechanism. The swing mechanism is forged from titanium alloy, and wear-resistant ceramic gaskets can be installed at the ends to reduce friction with the cam according to operational requirements. The reset mechanism consists of two permanent magnets aligned in a straight line, facilitating the application of a reaction force to the swing mechanism at all times.

[0016] In actual operation, when the shuttle drive shaft drives the rotating cam to rotate, the swing mechanism swings under the push of the cam, and at the same time, the magnetic force of the reset mechanism makes it return to its position quickly, ensuring the precise reset of the lever, thereby improving the stability and service life of the entire shuttle system.

[0017] This device uses a magnetic reset mechanism instead of a traditional spring structure, avoiding the problem of reset force attenuation caused by spring fatigue, resulting in more stable reset accuracy. By optimizing the cam curve and the coordination with the swing mechanism, precise reset can be achieved with only a single cam, which is simpler than the double cam structure and reduces the difficulty of processing and assembly. The swing mechanism uses lightweight, high-strength materials and can respond quickly with the magnetic reset, reducing inertial interference during high-speed operation. The overall structure is modularly designed, and maintenance only requires replacing worn parts, which is more economical and practical than the solution of replacing conjugate cams in pairs.

[0018] Furthermore, the magnetic structure includes a fixed seat located outside the reset mounting cavity, with a first magnetic block embedded inside the fixed seat; a slidable reset slider is provided inside the reset mounting cavity, with a second magnetic block embedded on the side of the reset slider facing the fixed seat, the magnetic poles of the two magnetic blocks being the same on their opposite surfaces to form a repulsive engagement, and the outside of the reset slider abutting against the swing mechanism.

[0019] Furthermore, both the first and second magnetic blocks are made of high-performance neodymium iron boron permanent magnet material.

[0020] Furthermore, the fixing seat is adjustablely mounted on the outside of the reset mounting cavity via a threaded engagement, and the end face of the fixing seat is provided with a tool engagement groove; by rotating the tool to drive the tool engagement groove, the fixing seat can be moved along the thread axis, thereby changing the initial distance between the first magnetic block and the second magnetic block, and realizing stepless adjustment of the reset force.

[0021] Furthermore, the swing mechanism includes an integrally formed conical swing block and a spherical swing block. The conical swing block has a connecting hole that mates with the rotating reset column, and its conical front end forms a line contact with the rotating cam. The spherical swing block is rigidly connected to the conical swing block, and its spherical side forms a rolling contact with the roller of the reset slider. The end of the spherical swing block has an axial threaded hole, and axial positioning with the rotating reset column is achieved by a locking screw.

[0022] Furthermore, a torque limiter is provided between the shuttle drive shaft and the rotating cam, which automatically slips when the load exceeds the set value, protecting the mechanism from damage.

[0023] 3. Beneficial effects:

[0024] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0025] This utility model is reasonably designed, using a magnetic reset mechanism to replace the traditional spring structure. It utilizes the principle of repulsion between like magnetic poles to provide a stable reset force, solving the problem of reset force attenuation caused by spring fatigue. The reset accuracy is improved by more than 30%, and no regular maintenance is required.

[0026] Secondly, the innovative conical-spherical compound oscillating mechanism, combined with the optimized cam curve, makes the contact pressure distribution more uniform, reduces wear, and simplifies the complexity of the mechanism.

[0027] It should be noted that the structures not described in this utility model are the same as or can be implemented using existing technology, and will not be elaborated here, as they do not involve the design points and improvement directions of this utility model. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the bottom structure of this utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the rotary hook seat of this utility model;

[0031] Figure 4 This is a schematic diagram of the exploded structure of the rotary shuttle seat of this utility model;

[0032] Figure 5 This utility model Figure 4 A magnified structural diagram at point A;

[0033] Figure 6 This is a schematic diagram of the cross-sectional structure of the rotary hook seat of this utility model.

[0034] Figure label:

[0035] 1. Shuttle base; 2. Shuttle assembly; 3. Reset mounting cavity; 4. Shuttle drive shaft; 41. Torque limiter; 5. Rotary reset column; 6. Actuating lever; 7. Rotating cam; 8. Swinging mechanism; 81. Conical swing block; 82. Spherical swing block; 83. Locking screw; 9. Reset mechanism; 10. Magnetic structure; 101. Fixed base; 102. First magnetic block; 103. Reset slider; 104. Second magnetic block. Detailed Implementation

[0036] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," "provided with," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] It should be noted that structures not described in this invention do not involve the design points and improvement directions of this invention, and can all be achieved using existing technologies known to those skilled in the art.

[0041] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0042] See attached document Figure 1-6 A shuttle reset structure includes a sewing machine table, wherein a rotary shuttle seat 1 is provided inside the sewing machine table;

[0043] The rotary hook seat 1 is connected to the rotary hook assembly 2 at the top to support the overall structure, and has a reset mounting cavity 3 inside.

[0044] The rotary shuttle drive shaft 4 is connected to an external drive source at one end and rotatably connected to the inside of the rotary shuttle seat 1 at the other end, and is equipped with a lubrication structure to reduce friction.

[0045] The rotary reset column 5 is fixedly connected to the top of the actuating rod 6, and is rotatably mounted in the rotary shuttle seat 1 through the bearing at the bottom, and is provided with an axial pre-tightening mechanism to ensure stable transmission.

[0046] The rotating cam 7 is fixedly connected to the rotary shuttle drive shaft 4. Its profile adopts an optimized curve design, and the protruding end maintains dynamic contact with the swing mechanism 8.

[0047] The swing mechanism 8 is hinged in the middle to the rotating reset column 5, one end abuts against the rotating cam 7, and the other end cooperates with the reset mechanism 9. Its structure uses lightweight high-strength materials to improve the response speed.

[0048] The reset mechanism 9 is installed in the reset mounting cavity 3. It applies a reset force to the swing mechanism 8 through the magnetic structure 10 to ensure that the swing mechanism 8 is always in close contact with the rotating cam 7.

[0049] In this embodiment, the other structures of the device adopt the existing technology of sewing machines, which will not be described in detail here. The rotary hook seat 1 is made of high-strength aluminum alloy or ductile iron and has a precision-machined reset mounting cavity 3 inside to ensure the precise fit of the reset mechanism 9. The rotary hook drive shaft 4 is supported in the rotary hook seat 1 by bearings and has an oil passage at its end, which can be periodically lubricated to reduce friction loss. The bottom of the rotating reset column 5 is mounted in the rotary hook seat 1 by bearings.

[0050] The rotating cam 7 is made of hardened alloy steel, and its contour curve is optimized based on kinematic simulation to ensure uniform distribution of contact pressure with the swing mechanism 8. The swing mechanism 8 is forged from titanium alloy, and wear-resistant ceramic gaskets can be installed at its ends to reduce friction with the cam according to operational requirements. The reset mechanism 9 consists of two permanent magnets aligned in a straight line, facilitating the application of a reaction force to the swing mechanism 8 at all times.

[0051] In actual operation, when the rotary shuttle drive shaft 4 drives the rotating cam 7 to rotate, the swing mechanism 8 swings under the push of the cam, and at the same time, the magnetic force of the reset mechanism 9 makes it return to its position quickly, ensuring the precise reset of the lever 6, thereby improving the stability and service life of the entire shuttle system.

[0052] This device uses a magnetic reset mechanism 9 instead of a traditional spring structure, avoiding the problem of reset force attenuation caused by spring fatigue, resulting in more stable reset accuracy. By optimizing the cam curve and cooperating with the swing mechanism 8, precise reset can be achieved with only a single cam, which is simpler than the double cam structure and reduces the difficulty of processing and assembly. The swing mechanism 8 is made of lightweight and high-strength materials, and can respond quickly with magnetic reset, reducing inertial interference during high-speed operation. The overall structure is modularly designed, and only worn parts need to be replaced during maintenance, which is more economical and practical than the solution of replacing conjugate cams in pairs.

[0053] Furthermore, the magnetic structure 10 includes a fixed base 101 located outside the reset mounting cavity 3, with a first magnetic block 102 embedded inside the fixed base 101; a slidable reset slider 103 is provided inside the reset mounting cavity 3, with a second magnetic block 104 embedded on the side of the reset slider 103 facing the fixed base 101. The magnetic poles of the two magnetic blocks are the same on their opposite surfaces, forming a repulsive force. The outside of the reset slider 103 abuts against the swing mechanism 8. In this embodiment, the reset mechanism 9 uses the principle of repulsion between like magnetic poles to generate a stable reset force, which has the advantages of no contact, no wear, and no fatigue attenuation compared to the traditional spring structure. When the cam pushes the swing mechanism 8, the reset slider 103 moves along the guide rail, reducing the distance between the magnetic blocks and increasing the repulsive force nonlinearly, forming a progressive reset characteristic. The entire system is maintenance-free and is particularly suitable for long-term stable operation under high-speed conditions.

[0054] Furthermore, both the first magnetic block 102 and the second magnetic block 104 are made of high-performance neodymium iron boron permanent magnet material to ensure a good service life of the device.

[0055] Furthermore, the fixing seat 101 is adjustablely mounted on the outside of the reset mounting cavity 3 via a threaded engagement, and the end face of the fixing seat 101 is provided with a tool engagement groove; by rotating a tool to drive the tool engagement groove, the fixing seat 101 can be moved along the thread axis, thereby changing the initial distance between the first magnetic block 102 and the second magnetic block 104, realizing stepless adjustment of the reset force. In this embodiment, the magnetic structure 10 uses precision thread transmission to achieve precise control of the magnetic block distance, with an adjustment accuracy of up to 0.1mm; the tool engagement groove is designed as a standard hexagon, which can be operated using a general-purpose tool; the thread pair adopts a self-locking trapezoidal thread to ensure the stability of the position after adjustment; by changing the magnetic block distance, the reset force can be linearly adjusted within the range of 5-20N to meet the process requirements of different fabric varieties; the magnetic structure 10 is easy to operate, and online adjustment can be completed without disassembling parts, greatly improving the flexibility of the equipment.

[0056] Furthermore, the swing mechanism 8 includes an integrally formed conical swing block 81 and a spherical swing block 82. The conical swing block 81 is provided with a connecting hole that mates with the rotating reset column 5, and its conical front end forms a line contact with the rotating cam 7. The spherical swing block 82 is rigidly connected to the conical swing block 81, and its spherical side forms a rolling contact with the roller of the reset slider 103. The end of the spherical swing block 82 is provided with an axial threaded hole, and the axial positioning with the rotating reset column 5 is achieved by the locking screw 83. In this embodiment, the swing mechanism 8 adopts a conical-spherical composite design. The conical front end ensures good contact characteristics with the cam, and the spherical end provides a stable reset contact surface. The spherical end is hardened, and the surface roughness is controlled below Ra0.4 to ensure low-friction movement with the reset slider 103. The locking screw 83 adopts an anti-loosening design, which achieves lightweight while ensuring rigidity. This design facilitates quick disassembly and assembly. When replacing the swing block, only the locking screw 83 needs to be loosened, which significantly shortens the maintenance time.

[0057] Furthermore, a torque limiter 41 is provided between the rotary shuttle drive shaft 4 and the rotating cam 7. When the load exceeds the set value, it automatically slips to protect the mechanism from damage. In this embodiment, the torque limiter 41 adopts the friction plate structure in the prior art, with a preset torque value of 5-8 N·m, which can effectively prevent the mechanism from being damaged by overload, and also has an automatic reset function.

[0058] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A shuttle reset structure, comprising a sewing machine table, characterized in that: The sewing machine table is equipped with a rotary hook seat (1); The rotary hook seat (1) is connected to the top of the rotary hook assembly (2) to support the overall structure, and has a reset mounting cavity (3) inside. The rotary shuttle drive shaft (4) is connected to an external drive source at one end and rotatably connected to the inside of the rotary shuttle seat (1) at the other end, and is provided with a lubrication structure to reduce friction; The rotary reset column (5) is fixedly connected to the top of the actuating rod (6), and is rotatably mounted in the rotary shuttle seat (1) at the bottom via a bearing, and is provided with an axial pre-tightening mechanism to ensure stable transmission; The rotating cam (7) is fixedly connected to the rotary shuttle drive shaft (4). Its profile adopts an optimized curve design, and the protruding end maintains dynamic contact with the swing mechanism (8). The swing mechanism (8) is hinged in the middle to the rotating reset column (5), one end abuts against the rotating cam (7), and the other end cooperates with the reset mechanism (9). Its structure uses lightweight high-strength materials to improve the response speed. The reset mechanism (9) is installed in the reset mounting cavity (3) and applies a reset force to the swing mechanism (8) through the magnetic structure (10) to ensure that the swing mechanism (8) is always in close contact with the rotating cam (7).

2. The shuttle reset structure according to claim 1, characterized in that: The magnetic structure (10) includes a fixed seat (101) located outside the reset mounting cavity (3), and a first magnetic block (102) is embedded inside the fixed seat (101). A slidable reset slider (103) is provided inside the reset mounting cavity (3). A second magnetic block (104) is embedded on the side of the reset slider (103) facing the fixed seat (101). The magnetic poles of the two magnetic blocks are the same on opposite sides, forming a repulsive force. The outside of the reset slider (103) abuts against the swing mechanism (8).

3. The shuttle reset structure according to claim 2, characterized in that: Both the first magnetic block (102) and the second magnetic block (104) are made of high-performance neodymium iron boron permanent magnet material.

4. The shuttle reset structure according to claim 2, characterized in that: The fixed seat (101) is adjustablely installed on the outside of the reset mounting cavity (3) by means of thread engagement. The end face of the fixed seat (101) is provided with a tool engagement groove. By rotating the tool to drive the tool engagement groove, the fixed seat (101) can be moved along the thread axis, thereby changing the initial distance between the first magnetic block (102) and the second magnetic block (104) and realizing stepless adjustment of the reset force.

5. The shuttle reset structure according to claim 2, characterized in that: The swing mechanism (8) includes an integrally formed conical swing block (81) and a spherical swing block (82). The conical swing block (81) is provided with a connecting hole that cooperates with the rotating reset column (5), and its conical front end forms a line contact with the rotating cam (7). The spherical swing block (82) is rigidly connected to the conical swing block (81), and its spherical side forms a rolling contact with the roller of the reset slider (103). The end of the spherical swing block (82) is provided with an axial threaded hole, and the axial positioning with the rotating reset column (5) is achieved by locking screw (83).

6. The shuttle reset structure according to claim 1, characterized in that: A torque limiter (41) is provided between the rotary shuttle drive shaft (4) and the rotating cam (7), which automatically slips when the load exceeds the set value, protecting the mechanism from damage.

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