Rotating shuttle with high thread hooking success rate and sewing machine
By setting needle guard surfaces and needle guide slopes with specific spacing at the needle drop groove of the rotary hook, the problem of unstable thread hooking of the needle in high-speed sewing machines is solved, and a high thread hooking success rate and a low stitch skipping rate are achieved.
Patent Information
- Application Number
- CN202422718029.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-11-07
AI Technical Summary
When the existing lockstitch sewing machine is working at high speed, the needle is prone to swing, resulting in sewing accidents such as thread hook failure, thread breakage and skipped stitches. The existing adjustment method is not effective and has high operating requirements.
A right needle guard surface is set on the side of the needle drop groove of the rotary hook away from the shuttle tip to squeeze the thread loop on the right side of the needle. A left needle guard surface is set on the side close to the shuttle tip to prevent the vibration of the needle. The spacing between the needle guard surfaces is adjusted to 0.9mm~1.4mm, and the needle is guided by the guide needle bevel to ensure that the needle maintains a stable gap when hooking the thread.
By enlarging the thread loop and stabilizing the needle vibration, the stitch skipping rate is reduced, needle breakage is prevented, and a stable thread hooking function is achieved.
Smart Images
Figure CN223329526U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewing machines, in particular to a rotary hook and a sewing machine with a high thread hooking success rate. Background Art
[0002] When a flat-seam sewing machine is operating at a high speed of 3500 revolutions per minute, the needle will bend and deform due to the resistance of the fabric and the pull of the suture when piercing the fabric at high speed. In order to prevent the hook of the existing flat-seam sewing machine from interfering with the bent needle due to the force deformation and causing needle breakage, a hollow needle drop groove is formed on the shuttle frame of the hook. The width of the needle drop groove is 1.9 mm, so that the two groove walls of the needle drop groove are relatively far away from the needle.
[0003] During sewing machine operation, the needle is prone to swinging, which can cause sewing accidents such as thread hook failure, thread breakage, and skipped stitches. To address this problem, the industry typically adjusts the needle's return height. By increasing the needle's return distance, a larger thread loop is created on the needle tip to meet the thread hook condition and reduce the skipped stitch rate. However, this method not only affects the thread hook timing, but also has the disadvantages of being ineffective in actual use, having a limited adjustment range, and requiring high operator skills.
[0004] Therefore, how to solve the problem of stitch skipping during sewing has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention
[0005] In view of this, the purpose of the present invention is to provide a rotary hook with a high thread hooking success rate, so as to solve the technical problem that the existing rotary hook is prone to skipping stitches during the sewing process.
[0006] The technical solution adopted by the utility model is: a rotary hook with a high thread hooking success rate, comprising a shuttle bed and a shuttle frame, wherein the shuttle bed is rotatably mounted on the outer peripheral side of the shuttle frame;
[0007] A shuttle tip is formed on the shuttle bed;
[0008] A needle drop groove is formed on the shuttle frame, and a right needle guard surface is formed on the side of the needle drop groove away from the shuttle tip for squeezing the thread loop on the right side of the needle. A left needle guard surface is formed on the side of the needle drop groove close to the shuttle tip for preventing the vibration of the needle, and the distance between the right needle guard surface and the left needle guard surface is 0.9mm~1.4mm.
[0009] Preferably, the distance between the right needle guard surface and the left needle guard surface is 1.2 mm.
[0010] Preferably, a line hooking plane is formed on the side of the shuttle tip facing the right needle guard surface, and the line hooking plane and the left needle guard surface are arranged along the radial direction of the shuttle frame. The left needle guard surface is located between the line hooking plane and the right needle guard surface, and the distance between the line hooking plane and the left needle guard surface is 0.15±0.1mm.
[0011] Preferably, a guide needle slope is formed on the shuttle frame, the bottom end of the guide needle slope is connected to the top end of the right needle guard surface, and the angle between the guide needle slope and the radial direction of the shuttle frame is 15° to 40°.
[0012] Preferably, the right needle guard surface is a plane extending along the radial direction of the shuttle rack.
[0013] Preferably, the right needle guard surface is a spatial curved surface.
[0014] Preferably, the longitudinal section of the right needle guard surface is a wavy line extending in the radial direction of the shuttle rack.
[0015] The second object of the present utility model is to provide a sewing machine, which includes the above-mentioned rotary hook with a high thread hook success rate.
[0016] Beneficial effects of the utility model:
[0017] The utility model adopts a method of coordinating the enlarged thread loop with the stabilized machine needle. A right needle guard surface is formed on the side of the needle drop groove away from the shuttle tip, and a left needle guard surface is formed on the side of the needle drop groove close to the shuttle tip. The spacing between the right needle guard surface and the left needle guard surface is 0.9mm~1.4mm, so that when the machine needle rises and passes through the needle drop groove, the right needle guard surface can squeeze the thread loop on one side of the needle thread groove, making the thread loop on the other side of the needle larger; at the same time, the left needle guard surface can turn the machine needle in simple harmonic vibration into forced vibration, forcing the machine needle that vibrates greatly to stop vibrating quickly, so that the machine needle maintains a stable gap with the rotary shuttle thread hook tip at the thread hooking point, realizing a stable thread hooking function, and thereby reducing the stitch skipping rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a three-dimensional schematic diagram of the rotary hook with a high thread hook success rate of the utility model;
[0019] Figure 2 This is a schematic structural diagram of the rotary hook with a high thread hooking success rate of the utility model;
[0020] Figure 3 for Figure 2 A partial enlarged view in FIG.
[0021] Figure 4 It is a first-person perspective stereoscopic diagram of the shuttle frame;
[0022] Figure 5A second perspective perspective diagram of the shuttle rack;
[0023] Figure 6 It is a three-dimensional schematic diagram of the shuttle bed.
[0024] Description of reference numerals in the figures:
[0025] 10. Shuttle bed;
[0026] 11. shuttle tip; 12. hooking plane; 13. shuttle skin; 14. shuttle plate;
[0027] 20. Shuttle rack;
[0028] 21. Needle drop groove; 22. Right needle guard surface; 23. Left needle guard surface; 24. Guide needle inclined surface; 25. Concave curved surface. DETAILED DESCRIPTION
[0029] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.
[0030] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0032] In addition, in the description of the present invention, unless otherwise specified, “a plurality of” means two or more.
[0033] After long-term research, the inventor found that the width of the needle drop groove of the existing rotary shuttle is 1.9 mm, so that the two walls of the needle drop groove in the width direction are relatively far away from the needle; when the sewing machine is working, when the needle returns to the thread hooking position, the thread loops formed on both sides of the needle are in a free state, and the two walls of the needle drop groove will not affect the size and shape of the thread loop formed when the needle returns.
[0034] Examples, such as Figures 1-6 As shown, a rotary hook with a high thread hooking success rate includes a shuttle bed 10 and a shuttle frame 20. The shuttle bed 10 is rotatably installed on the outer peripheral side of the shuttle frame 20.
[0035] A shuttle tip 11 is formed on the shuttle bed 10 .
[0036] A needle drop groove 21 is formed on the shuttle frame 20, and a right needle guard surface 22 for squeezing the right thread loop of the needle is formed on the side of the needle drop groove 21 away from the shuttle tip 11, and a left needle guard surface 23 for preventing the vibration of the needle is formed on the side of the needle drop groove 21 close to the shuttle tip 11, and the distance between the right needle guard surface 22 and the left needle guard surface 23 is 0.9mm~1.4mm.
[0037] The utility model adopts a method of coordinating the enlarged thread loop with the stabilized machine needle. A right needle guard surface 22 is formed on the side of the needle drop groove 21 away from the shuttle tip 11, and a left needle guard surface 23 is formed on the side of the needle drop groove 21 close to the shuttle tip 11. The spacing between the right needle guard surface 22 and the left needle guard surface 23 is 0.9mm~1.4mm, so that when the machine needle rises and passes through the needle drop groove 21, the right needle guard surface 22 can squeeze the thread loop on one side of the needle thread groove, so that the thread loop on the other side of the needle becomes larger; at the same time, the left needle guard surface 23 can turn the machine needle in simple harmonic vibration into forced vibration, forcing the machine needle that vibrates greatly to stop vibrating quickly, so that the machine needle maintains a stable gap with the rotary shuttle thread hook tip at the thread hooking point, realizing a stable thread hooking function, and thus reducing the stitch skipping rate.
[0038] Specific embodiment 1, as Figures 1-6 As shown, a rotary hook with a high thread hooking success rate includes a shuttle bed 10 and a shuttle frame 20. The shuttle bed 10 is installed on the outer peripheral side of the shuttle frame 20, that is, the shuttle frame 20 is installed in the installation cavity of the shuttle bed 10, and the shuttle bed 10 and the shuttle frame 20 can rotate relative to each other, that is, the shuttle bed 10 can rotate in the circumferential direction relative to the shuttle frame 20.
[0039] A shuttle skin 13 and a shuttle plate 14 are fixedly mounted on the outer periphery of the shuttle bed 10 , and a shuttle tip 11 is integrally formed at one end of the shuttle bed 10 .
[0040] A needle drop groove 21 is formed on the shuttle frame 20 , and the needle drop groove 21 extends along the circumferential direction of the shuttle frame 20 .
[0041] The side of the needle drop groove 21 away from the shuttle tip 11 is formed with a right needle guard surface 22 for squeezing the thread loop on the right side of the needle, and the side of the needle drop groove 21 close to the shuttle tip 11 is formed with a left needle guard surface 23 for hindering the vibration of the needle, and the distance between the right needle guard surface 22 and the left needle guard surface 23 is 1.2 mm, that is, in the axial direction of the shuttle frame 20, the distance between the right needle guard surface 22 and the left needle guard surface 23 is 1.2 mm, so that when the needle rises and passes through the needle drop groove 21, the right needle guard surface 22 can squeeze the thread loop on one side of the needle thread groove on the right side of the needle, making the thread loop on the other side of the needle larger; at the same time, the left needle guard surface 23 can hinder the vibration of the needle on the left side of the needle, so as to change the needle in simple harmonic vibration into forced vibration, forcing the needle that vibrates greatly to stop vibrating quickly, so that the needle maintains a stable gap with the shuttle tip 11 of the rotary shuttle at the thread hooking point, realizing a stable thread hooking function, and thereby reducing the stitch skipping rate.
[0042] Preferably, the right needle guard surface 22 is a plane extending along the radial direction of the shuttle frame 20, that is, the right needle guard surface 22 is a plane, and the right needle guard surface 22 is perpendicular to the axial direction of the shuttle frame 20 to ensure the squeezing effect of the right needle guard surface 22 on the right thread loop of the machine needle.
[0043] More preferably, a guide needle slope 24 is formed on the shuttle frame 20, the bottom end of the guide needle slope 24 is connected to the top end of the right needle guard surface 22, and the angle between the guide needle slope 24 and the radial direction of the shuttle frame 20 is 15°~40°, that is, the angle between the guide needle slope 24 and the axis of the needle is 15°~40°, and the guide needle slope 24 is located on the right side of the right needle guard surface 22, and in the axial direction of the shuttle frame 20, the distance between the top end of the guide needle slope 24 and the right needle guard surface 22 is greater than the distance between the bottom end of the guide needle slope 24 and the right needle guard surface 22, so that during the falling process of the needle, the guide needle slope 24 guides the needle, so that the needle can smoothly enter the needle drop groove, prevent the needle from interfering with the shuttle frame 20, thereby avoiding the occurrence of needle breakage, and thus reducing the needle breakage rate.
[0044] Specific embodiment 2, as Figures 1-6 As shown, a rotary hook with a high thread hooking success rate includes a shuttle bed 10 and a shuttle frame 20. The shuttle bed 10 is installed on the outer peripheral side of the shuttle frame 20, that is, the shuttle frame 20 is installed in the installation cavity of the shuttle bed 10, and the shuttle bed 10 and the shuttle frame 20 can rotate relative to each other, that is, the shuttle bed 10 can rotate in the circumferential direction relative to the shuttle frame 20.
[0045] A shuttle tip 11 is integrally formed at one end of the shuttle bed 10 .
[0046] A needle drop groove 21 is formed on the shuttle frame 20 , and the needle drop groove 21 extends along the circumferential direction of the shuttle frame 20 .
[0047] The side of the needle drop groove 21 away from the shuttle tip 11 is formed with a right needle guard surface 22 for squeezing the right thread loop of the needle, and the side of the needle drop groove 21 close to the shuttle tip 11 is formed with a left needle guard surface 23 for hindering the vibration of the needle, and the distance between the right needle guard surface 22 and the left needle guard surface 23 is 0.9mm~1.4mm, that is, in the axial direction of the shuttle frame 20, the distance between the right needle guard surface 22 and the left needle guard surface 23 is 0.9mm~1.4mm.
[0048] A thread hooking plane 12 is formed on the side of the shuttle tip 11 facing the right needle guard surface 22. The thread hooking plane 12 is parallel to the left needle guard surface 23 and is arranged along the radial direction of the shuttle frame 20, that is, the thread hooking plane 12 is perpendicular to the axial direction of the shuttle bed 10. The left needle guard surface 23 is located between the thread hooking plane 12 and the right needle guard surface 22, and the distance between the thread hooking plane 12 and the left needle guard surface 23 is 0.15±0.1mm.
[0049] Preferably, the right needle guard surface 22 is a spatial curved surface that protrudes toward the left needle guard surface 23, so as to apply pressure to the wire loop during the recovery process through the spatial curved surface.
[0050] Specifically, the longitudinal section of the right needle guard surface 22 is a wavy line extending along the radial direction of the shuttle rack 20 .
[0051] In other embodiments, the distance between the bottom end of the right needle guard surface 22 and the left needle guard surface 23 is greater than the distance between the top end of the right needle guard surface 22 and the left needle guard surface 23, so that during the needle recovery process, the right needle guard surface 22 can exert an extrusion force on the right side thread loop of the needle.
[0052] An embodiment provides a sewing machine comprising the above-mentioned rotary hook with a high thread hook success rate.
[0053] Compared with the prior art, the present invention has at least the following beneficial technical effects:
[0054] The utility model optimizes the distance between the left side needle guard surface of the needle drop groove on the shuttle frame and the thread hooking plane of the shuttle tip on the shuttle bed. In the process of the machine needle continuing to move downward after piercing the fabric, especially at the moment of the lower dead point of the machine needle movement, the left side needle guard acts to hinder the vibration of the machine needle, and can change the vibration of the machine needle at the lower dead point from simple harmonic vibration to forced vibration, so that the machine needle stops vibrating quickly; when the machine needle continues to rise to the thread hooking point, the gap between the machine needle and the thread hooking tip remains stable, fully meeting the gap requirement when the rotary shuttle hooks the thread, thereby achieving the purpose of reducing the thread jump rate.
[0055] The utility model optimizes the gap between the right side needle guard surface of the needle drop groove on the rotary frame and the machine needle. During the needle recovery process, especially at the moment of hooking the thread, the right side needle guard surface can effectively squeeze the thread loop on the right side of the needle to the left, so that the thread loop on the left side of the needle becomes larger, fully meeting the requirements of the rotary hook for hooking the thread, thereby achieving the purpose of reducing the thread jump rate.
[0056] The utility model has a needle guide slope formed on the upper right side of the needle drop groove on the rotating frame, which can effectively prevent the machine needle from breaking due to interference with the shuttle frame on the right side of the needle drop groove when it pierces thicker sewing materials or sewing materials with greater hardness and continues to move downward due to greater force, deformation and bending.
[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.
Claims
1. A rotary hook with a high thread hook success rate, characterized in that: It comprises a shuttle bed (10) and a shuttle frame (20), wherein the shuttle bed (10) is rotatably mounted on the outer peripheral side of the shuttle frame (20); A shuttle tip (11) is formed on the shuttle bed (10); A needle drop groove (21) is formed on the shuttle frame (20), and a right needle guard surface (22) for squeezing the right thread loop of the needle is formed on the side of the needle drop groove (21) away from the shuttle tip (11), and a left needle guard surface (23) for preventing the needle from vibrating is formed on the side of the needle drop groove (21) close to the shuttle tip (11), and the spacing between the right needle guard surface (22) and the left needle guard surface (23) is 0.9 mm to 1.4 mm.
2. The rotary hook with high thread hooking success rate according to claim 1, characterized in that: The distance between the right needle guard surface (22) and the left needle guard surface (23) is 1.2 mm.
3. The rotary hook with high thread hooking success rate according to claim 1, characterized in that: A hooking plane (12) is formed on the side of the shuttle tip (11) facing the right needle guard surface (22), the hooking plane (12) and the left needle guard surface (23) are arranged along the radial direction of the shuttle frame (20), the left needle guard surface (23) is located between the hooking plane (12) and the right needle guard surface (22), and the distance between the hooking plane (12) and the left needle guard surface (23) is 0.15±0.1mm.
4. The rotary hook with high thread hooking success rate according to claim 1, characterized in that: A needle guide slope (24) is formed on the shuttle frame (20), the bottom end of the needle guide slope (24) is connected to the top end of the right needle guard surface (22), and the angle between the needle guide slope (24) and the shuttle frame (20) in the radial direction is 15° to 40°.
5. The rotary hook with high thread hooking success rate according to claim 1, characterized in that: The right needle guard surface (22) is a plane extending along the radial direction of the shuttle frame (20).
6. The rotary hook with high thread hooking success rate according to claim 1, characterized in that: The right needle guard surface (22) is a spatial curved surface.
7. The rotary hook with high thread hooking success rate according to claim 6, characterized in that: The longitudinal section of the right needle guard surface (22) is a wavy line extending in the radial direction of the shuttle frame (20).
8. A sewing machine, characterized in that: The sewing machine includes the rotary hook with a high thread hook success rate according to any one of claims 1 to 7.