Needle protection rotating shuttle and sewing machine
By installing rotatable needle guards, such as needle rollers or balls on both sides of the needle sink of the rotary shuttle, the problem of needle guard rails being easily damaged under high-speed friction is solved, and the effect of reducing friction and extending service life is achieved. .
Patent Information
- Application Number
- CN202421350045.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-06-13
AI Technical Summary
The existing needle guard shuttle is easily damaged under high-speed friction, causing the needle guard surface to lose its limiting effect, increasing the occurrence of jumper and wire breakage accidents, and shortening the service life of the screw shuttle and needle.
Install rotatable needle guards on both sides of the drop-off groove width of the rotary shuttle, such as a needle or ball, to replace sliding friction by rolling friction, reduce the friction between the needle and the shuttle rack, and adopt a detachable connection structure for replacement Wear parts.
It effectively reduces wear between the needle and the shuttle, extends the service life of the shuttle and the needle, and reduces the occurrence of jumper and wire breakage accidents.
Smart Images
Figure CN222524873U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewing machines, in particular to a needle-protecting rotary hook and a sewing machine. Background Art
[0002] The rotary hook is the core component of the lockstitch sewing machine. When the lockstitch sewing machine forms a stitch, the needle with the upper thread passes through the fabric, the needle plate, and the needle drop groove of the shuttle frame to the bottom dead point and then rises. During the rise, the upper thread forms a thread loop (also called a thread bubble), and the rotary hook hooks the thread loop so that the thread wraps around the shuttle frame to form a lock stitch. In normal operation, in order to ensure the formation of a good stitch and avoid faults such as skipping and breaking, the gap between the rotary hook tip and the needle on the shuttle frame axial direction and the rotary hook thread hooking time must be guaranteed.
[0003] For needles of different specifications, their centers are basically unchanged when installed on the sewing machine. At the bottom dead center, the thicker needle has a larger diameter, and the needle tip can easily touch the needle guard surface of the shuttle frame needle drop groove, while the thinner needle has a smaller diameter and is not easy to touch the needle guard surface of the shuttle frame needle drop groove.
[0004] The patent document with announcement number CN219410147U discloses a rotary shuttle and a sewing machine with a needle protection function. The rotary shuttle can effectively limit the deformation of the needle within a certain range, reduce the amplitude of the needle, and reduce the occurrence of accidents such as thread skipping and thread breakage by arranging needle protection surfaces on both sides of the needle drop groove of the shuttle frame.
[0005] In actual production activities, there is sliding friction between the needle and the needle guard surface of the shuttle rack needle slot, and the operating frequency of the sewing machine needle is as high as 4000 times / minute. Long-term high-speed friction is not only easy to damage the needle, but also easy to damage the needle guard surface of the shuttle rack needle slot, and cause the needle guard surface to lose its limiting effect on the needle, resulting in frequent thread skipping and thread breakage accidents, thus shortening the service life of the shuttle and needle.
[0006] Therefore, how to reduce the wear between the needle and the needle guard surface of the shuttle frame needle drop groove and extend the service life of the rotary hook and the needle has become a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content
[0007] In view of this, the purpose of the utility model is to provide a needle guard rotary hook to solve the technical problem of short service life of the existing needle guard rotary hook.
[0008] The technical solution adopted by the utility model is: a needle-protecting rotary hook, comprising:
[0009] A shuttle frame, wherein a needle drop groove is formed on the shuttle frame, and the needle drop groove extends along the circumferential direction of the shuttle frame;
[0010] A shuttle bed, the shuttle bed is mounted on the outer peripheral side of the shuttle frame, a shuttle skin and a shuttle plate are mounted on the outer peripheral side of the shuttle bed, and a shuttle tip is integrally formed on the shuttle bed;
[0011] The needle guard body is rotatably installed on one side or both sides of the needle drop groove width, and the distance between the needle guard body on one side of the needle drop groove and the groove wall surface on the other side of the needle drop groove is less than the groove width.
[0012] Preferably, the needle guard is rotatably mounted on the wall of the needle drop groove.
[0013] Preferably, the needle guard is a rolling needle.
[0014] Preferably, the axis of the needle roller intersects with the reference plane of the shuttle rack.
[0015] Preferably, the needle rollers are installed on both sides of the needle drop groove, and the axial distance between the two needle rollers gradually decreases along the extending direction of the needle drop groove.
[0016] Preferably, the roller needle is detachably fixedly connected to the shuttle frame.
[0017] Preferably, a needle roller hole connected to the needle drop groove is formed on the shuttle rack, the needle roller is inserted into the needle roller hole, and an auxiliary positioning member for axially limiting the needle roller is installed in the needle roller hole.
[0018] Preferably, the needle guard is a ball.
[0019] Preferably, the ball bearing is detachably mounted on the groove wall surface of the needle drop groove.
[0020] Preferably, along the extension direction of the needle drop groove, the plurality of balls are linearly distributed, and the radial dimensions of the balls gradually decrease.
[0021] The second purpose of the utility model is to provide a sewing machine, which includes a rotary shuttle equipped with the above-mentioned needle guard, and also includes a machine needle and a shuttle rack positioning hook, wherein the machine needle is vertically arranged above the needle drop groove, the shuttle rack positioning hook is arranged at one axial end of the shuttle rack, and the hook portion of the shuttle rack positioning hook is arranged in the positioning groove of the shuttle rack.
[0022] Beneficial effects of the utility model:
[0023] The utility model has a needle guard body installed on the groove wall surface of the needle drop groove, and the needle guard body replaces the needle guard surface to contact the machine needle to realize the needle protection function, which can not only avoid the direct contact between the machine needle and the side surface of the needle drop groove, reduce the wear of the shuttle frames on both sides of the needle drop groove, but also reduce the processing difficulty of the side surface of the needle drop groove.
[0024] The utility model adopts rolling friction instead of sliding friction, and a rotatable needle guard is installed on both sides of the groove width of the needle drop groove of the rotary shuttle. When the machine needle contacts the needle guard during the lifting process, the needle guard and the shuttle frame rotate relatively, and the sliding friction between the machine needle and the shuttle frame can be converted into rolling friction. In this way, not only the friction between the machine needle and the shuttle frame can be reduced, but also the wear degree of the machine needle and the shuttle frame can be reduced, thereby extending the service life of the rotary shuttle and the needle.
[0025] The utility model adopts a detachable connection structure. When the needle roller or the ball roller on the shuttle frame is worn, the needle roller and the ball roller can be replaced to realize the secondary utilization of the rotary shuttle, thereby extending the service life of the rotary shuttle.
[0026] The utility model has roller needles obliquely installed on the shuttle frames at both sides of the needle drop groove, so that the rotary shuttle can adapt to roller needles of different specifications and effectively prevent the occurrence of thread breakage and thread skipping. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a structural schematic diagram of the needle protection rotary hook of the utility model;
[0028] Figure 2 for Figure 1 A partial enlarged view of the
[0029] Figure 3 It is a three-dimensional schematic diagram of the needle protection rotary hook of the utility model;
[0030] Figure 4 It is a top view of the needle guard rotary hook of the utility model;
[0031] Figure 5 It is one of the first-person perspective stereoscopic diagrams of the shuttle rack;
[0032] Figure 6 is a second perspective stereoscopic schematic diagram of the shuttle rack;
[0033] Figure 7 Schematic diagram of the positional relationship between the needle drop groove and the needle roller;
[0034] Figure 8 This is the second first-person perspective stereoscopic diagram of the shuttle rack;
[0035] Fig. 9 A three-dimensional schematic diagram of a sewing machine.
[0036] Description of reference numerals in the figures:
[0037] 100, shuttle rack;
[0038] 110, needle drop groove; 120, needle roller hole; 130, auxiliary positioning member; 140, reference surface; 150, positioning groove; 160, first needle drop groove wall surface; 170, second needle drop groove wall surface;
[0039] 200, shuttle bed;
[0040] 210, shuttle tip;
[0041] 300, shuttle leather;
[0042] 400, shuttle board;
[0043] 500, needle guard;
[0044] 600, needle;
[0045] 700, shuttle rack positioning hook;
[0046] 710. Hook. DETAILED DESCRIPTION
[0047] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.
[0048] 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", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0050] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.
[0051] Examples, such as Figure 1-Figure 9 As shown, a needle guard rotary shuttle comprises:
[0052] The shuttle rack 100 has a needle drop groove 110 formed thereon, and the needle drop groove 110 extends along the circumferential direction of the shuttle rack 100 .
[0053] The shuttle bed 200 is installed on the outer peripheral side of the shuttle frame 100 , a shuttle skin 300 and a shuttle plate 400 are installed on the outer peripheral side of the shuttle bed 200 , and a shuttle tip 210 is integrally formed on the shuttle bed 200 .
[0054] The needle guard 500 is installed on one side or both sides of the needle drop groove 110, and the distance between the needle guard 500 on one side of the needle drop groove 110 and the groove wall surface on the other side of the needle drop groove 110 is smaller than the groove width.
[0055] In the present application, a needle guard 500 is installed on one or both sides of the groove width of the needle drop groove 110 of the shuttle frame 100. When the machine needle 600 is in the process of rising and falling, the needle guard 500 can contact the machine needle 600 to limit the position of the machine needle 600, which can not only avoid direct contact between the machine needle 600 and the side of the needle drop groove 110, but also reduce the difficulty of processing the side of the needle drop groove 110.
[0056] Specific embodiment 1, as Figure 1 and Figure 2 As shown, a needle guard rotary shuttle comprises: a shuttle frame 100, a shuttle bed 200, a shuttle skin 300, a shuttle plate 400 and a needle guard body 500, the shuttle frame 100 is formed with a needle drop groove 110, and the needle drop groove 110 extends along the circumferential direction of the shuttle frame 100; the shuttle bed 200 is installed on the outer peripheral side of the shuttle frame 100, the shuttle skin 300 and the shuttle plate 400 are installed on the outer peripheral side of the shuttle bed 200, and the shuttle bed 200 is integrally formed with a shuttle tip 210; the needle guard body 500 is rotatably installed on the groove wall surface of the needle drop groove 110.
[0057] This arrangement is because: when the machine needle 600 contacts the needle guard 500 during the lifting process, the needle guard 500 can rotate relative to the shuttle frame 100, and the sliding friction between the machine needle 600 and the shuttle frame 100 can be converted into rolling friction. In this way, not only the friction between the machine needle 600 and the shuttle frame 100 can be reduced, but also the degree of wear of the machine needle 600 and the shuttle frame 100 can be reduced, thereby extending the service life of the rotary hook and the machine needle 600.
[0058] Specific embodiment 2, as Figure 1-Figure 6 As shown, a needle guard rotary shuttle comprises: a shuttle frame 100, a shuttle bed 200, a shuttle skin 300, a shuttle plate 400 and a needle guard body 500, the shuttle frame 100 is formed with a needle drop groove 110, and the needle drop groove 110 extends along the circumferential direction of the shuttle frame 100; the shuttle bed 200 is installed on the outer peripheral side of the shuttle frame 100, the shuttle skin 300 and the shuttle plate 400 are installed on the outer peripheral side of the shuttle bed 200, and the shuttle bed 200 is integrally formed with a shuttle tip 210.
[0059] The needle guard 500 is a roller needle, and the roller needle is rotatably installed on one side of the needle drop groove 110. The distance between the needle guard 500 on one side of the needle drop groove 110 and the groove wall surface on the other side of the needle drop groove 110 is less than the groove width.
[0060] Specifically, Figure 6 As shown, the shuttle rack 100 has a cylindrical inner hole for installing the bobbin core and the bobbin case, and the bottom plane of the inner hole is the reference plane 140 of the shuttle rack 100. During processing, the overall structure of the shuttle rack 100 is processed based on the reference plane 140.
[0061] like Figure 2 , Figure 6 and Figure 7 As shown, along the axial direction of the shuttle rack 100, the side of the needle drop groove 110 away from the reference plane 140 is the first needle drop groove wall 160, and the side of the needle drop groove 110 close to the reference plane 140 is the second needle drop groove wall 170; when the needle roller is rotatably installed on the groove width side of the needle drop groove 110 away from the reference plane 140, the distance between the outer circumferential surface of the needle roller and the second needle drop groove wall 170 is smaller than the distance between the first needle drop groove wall 160 and the second needle drop groove wall 170; when the needle roller is rotatably installed on the groove width side of the needle drop groove 110 close to the reference plane 140, the distance between the outer circumferential surface of the needle roller and the first needle drop groove wall 160 is smaller than the distance between the first needle drop groove wall 160 and the second needle drop groove wall 170.
[0062] In other embodiments, Figure 7 As shown, the needle rollers are rotatably mounted on both sides of the needle drop groove 110 .
[0063] This arrangement is because: roller needles are installed on both sides of the groove width of the needle drop groove 110, and the machine needle 600 can be limited on both sides of the groove width of the needle drop groove 110, which can not only extend the service life of the machine needle 600 and the rotary shuttle, but also reduce the occurrence of thread breakage and thread skipping.
[0064] Preferably, the axial distance between the two needle rollers gradually decreases along the extension direction of the needle drop groove 110 to be suitable for needles 600 of different thicknesses.
[0065] In other embodiments, the axis of the needle roller intersects with the reference plane 140 of the shuttle frame 100, that is, the groove wall surface of the needle dropping groove 110 is parallel to the reference plane 140, and the groove wall surface of the needle dropping groove 110 intersects with the axis of the needle roller, so that the distance between the outer circumferential surface of the needle roller and the groove wall surface on the other side of the needle dropping groove 110 gradually decreases along the extension direction of the needle dropping groove 110.
[0066] The reason for this arrangement is that: when the needle 600 is in high-speed motion, it is affected by various factors such as the vibration of the sewing machine, the movement of the thread, and the thread tension. The position of the needle tip 210 relative to the center line of the needle handle is erratic. The thinner the needle 600 is, the greater the impact. The strength of the rotary shuttle is high. When it moves continuously at high speed, the position of the shuttle tip 210 is stable on a plane. Figure 2 As shown, when the needle 600 deviates to the left, the distance from the hook tip 210 decreases. If the hook and the needle 600 do not match in thickness, the needle 600 will cross the plane where the hook tip 210 moves, causing wear of the needle 600 and the hook. When the needle 600 deviates to the right, the distance from the needle 600 and the hook tip 210 increases, causing the sewing machine to skip stitches. In this embodiment, the relative position of the hook frame 100 and the needle 600 can be adjusted by adjusting the rotation angle of the hook frame 100 to adapt to needles 600 of different thicknesses.
[0067] In other embodiments, Figure 3 As shown, the needle roller is detachably fixedly connected to the shuttle frame 100.
[0068] The reason for such arrangement is that: needle rollers are arranged on both sides of the groove width of the needle drop groove 110. Although the sliding friction between the machine needle 600 and the shuttle frame 100 can be converted into rolling friction, thereby extending the service life of the machine needle 600 and the shuttle frame 100, the needle rollers are prone to lose their limiting effect on the machine needle 600 after long-term operation. The needle rollers are detachably fixedly connected to the shuttle frame 100, and the limiting protection effect of the needle rollers on the machine needle 600 can be ensured by regularly replacing the needle rollers.
[0069] Preferably, Figure 5 and Figure 6 As shown, a needle roller hole 120 connected to the needle drop groove 110 is formed on the shuttle rack 100. The needle roller hole 120 is formed on one side of the needle drop groove 110. The needle roller can be rotatably inserted into the needle roller hole 120, and an auxiliary positioning member 130 for axially limiting the needle roller is installed in the needle roller hole 120.
[0070] Specifically, the auxiliary positioning member 130 is a plug.
[0071] Specific embodiment 2, as Figure 8 and Fig. 9 As shown, a needle guard rotary shuttle comprises: a shuttle frame 100, a shuttle bed 200, a shuttle skin 300, a shuttle plate 400 and a needle guard body 500, the shuttle frame 100 is formed with a needle drop groove 110, and the needle drop groove 110 extends along the circumferential direction of the shuttle frame 100; the shuttle bed 200 is installed on the outer peripheral side of the shuttle frame 100, the shuttle skin 300 and the shuttle plate 400 are installed on the outer peripheral side of the shuttle bed 200, and the shuttle bed 200 is integrally formed with a shuttle tip 210.
[0072] The needle guard 500 is a ball bearing, which is rotatably mounted on one side or both sides of the groove wall of the needle drop groove 110 .
[0073] In other embodiments, the ball bearing is detachably mounted on the wall surface of the needle drop groove 110 .
[0074] In other embodiments, along the extension direction of the needle drop groove 110, a plurality of balls are linearly distributed, and the radial dimensions of the balls gradually decrease.
[0075] It should be noted that the installation method of the ball bearing on the groove wall surface of the needle drop groove 110 is a prior art and will not be described in detail here.
[0076] Examples, such as Fig. 9 As shown, a sewing machine includes the above-mentioned needle guard rotary shuttle, a machine needle 600 and a shuttle rack positioning hook 700. The machine needle 600 is vertically arranged above the needle drop groove 110 so as to be liftable in the vertical direction. The shuttle rack positioning hook 700 is arranged at one end of the needle guard rotary shuttle, and the hook portion 710 of the shuttle rack positioning hook 700 is accommodated in the positioning groove 150 of the shuttle rack 100, so that the angle of the shuttle rack 100 can be adjusted by the shuttle rack positioning hook 700, thereby realizing the adjustment of the relative position of the shuttle rack 100 and the machine needle 600.
[0077] 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 substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.
Claims
1. A needle guard rotary hook, characterized in that: include: A shuttle rack (100), wherein a needle drop groove (110) is formed on the shuttle rack (100), and the needle drop groove (110) extends along the circumferential direction of the shuttle rack (100); A shuttle bed (200), the shuttle bed (200) being mounted on the outer peripheral side of the shuttle frame (100), a shuttle skin (300) and a shuttle plate (400) being mounted on the outer peripheral side of the shuttle bed (200), and a shuttle tip (210) being integrally formed on the shuttle bed (200); The needle guard (500) is installed on one side or both sides of the width of the needle drop groove (110), and the distance between the needle guard (500) on one side of the needle drop groove (110) and the groove wall surface on the other side of the needle drop groove (110) is smaller than the groove width.
2. The needle guard rotary hook according to claim 1, characterized in that: The needle guard (500) is rotatably mounted on the groove wall surface of the needle drop groove (110).
3. The needle guard rotary hook according to claim 2, characterized in that: The needle guard (500) is a rolling needle.
4. The needle guard rotary hook according to claim 3, characterized in that: The axis of the needle roller intersects with the reference surface (140) of the shuttle frame (100).
5. The needle guard rotary hook according to claim 4, characterized in that: The needle rollers are installed on both sides of the needle drop groove (110), and the axial distance between the two needle rollers gradually decreases along the extension direction of the needle drop groove (110).
6. A needle guard rotary hook according to any one of claims 3 to 5, characterized in that: The rolling needle is detachably fixedly connected to the shuttle frame (100).
7. The needle guard rotary hook according to claim 6, characterized in that: The shuttle frame (100) is formed with a needle roller hole (120) which is in communication with the needle drop groove (110); the needle roller is inserted into the needle roller hole (120); and an auxiliary positioning member (130) for axially limiting the needle roller is installed in the needle roller hole (120).
8. The needle guard rotary hook according to claim 2, characterized in that: The needle guard (500) is a ball bearing.
9. The needle guard rotary hook according to claim 8, characterized in that: The ball bearing is detachably mounted on the groove wall surface of the needle drop groove (110).
10. The needle guard rotary hook according to claim 9, characterized in that: Along the extension direction of the needle drop groove (110), the plurality of balls are linearly distributed, and the radial dimensions of the balls gradually decrease.
11. A sewing machine, comprising a needle guard rotary hook equipped with any one of claims 1 to 10, characterized in that: It also includes a machine needle (600) and a shuttle rack positioning hook (700), wherein the machine needle (600) is vertically arranged above the needle drop groove (110), the shuttle rack positioning hook (700) is arranged at one axial end of the shuttle rack (100), and the hook portion (710) of the shuttle rack positioning hook (700) is arranged in the positioning groove (150) of the shuttle rack (100).
Citation Information
Patent Citations
Rotating shuttle with needle protection function and sewing machine
CN219410147U