Thread hooking assembly, rotating shuttle mechanism and sewing machine

Abstract

The present application relates to a thread hooking assembly, a rotating shuttle mechanism and a sewing machine. The thread hooking assembly comprises a shuttle bed, which is rotatably installed in the sewing machine and can rotate around an axis. The shuttle bed comprises a first thread hooking part and a second thread hooking part arranged along the axis, and the first thread hooking part and the second thread hooking part have opposite thread hooking directions. The thread hooking assembly overcomes the disadvantages of the original thread hooking assembly with a single thread hooking direction by arranging the first thread hooking part and the second thread hooking part with different thread hooking directions, so that the thread hooking assembly can obtain two sewing stitches with good coincidence when sewing forward and sewing backward, and greatly improves the appearance of the sewing stitches.

Description

Technical Field

[0001] This invention relates to the field of sewing equipment technology, and in particular to a hook assembly, a rotary hook mechanism, and a sewing machine. Background Technology

[0002] Sewing machines are usually equipped with a thread hook assembly. When the top thread is driven by the needle, it passes through the fabric and needle plate, and rises a certain distance from the bottom dead center to form a thread loop. The thread hook assembly is used to hook the thread loop. The thread loop and the bottom thread interweave to form a stitch unit. A stitch contains multiple stitch units.

[0003] Currently, sewing machines such as flatbed sewing machines, embroidery machines, and template sewing machines all use a 360° rotary hook mechanism to achieve the hooking function. The rotary hook mechanism can hook the thread clockwise or counter-clockwise. However, the hooking direction of the same hooking component on the same sewing machine is unidirectional, resulting in multiple stitches that are all tilted in the same direction. This causes two adjacent stitches formed by hooking in the same direction to form a skewed stitch unit on the fabric, meaning the stitch unit is not parallel to the feed direction. The resulting lockstitch has obvious defects, causing the stitches formed by forward sewing to have opposite tilt directions to those formed by reverse sewing, severely affecting the appearance of the fabric. Summary of the Invention

[0004] Therefore, it is necessary to provide an improved hook assembly, rotary hook mechanism, and sewing machine to address the aforementioned problems. This hook assembly overcomes the drawbacks of the original single-direction hook assembly by setting a first hook section and a second hook section with different hook directions. This allows the hook assembly to produce two well-overlapping sewing stitches during both forward and reverse sewing, greatly improving the aesthetics of the sewing stitches.

[0005] A thread-hooking assembly includes a shuttle bed rotatably mounted inside a sewing machine. The shuttle bed is rotatable about an axis. The shuttle bed includes a first thread-hooking section and a second thread-hooking section arranged circumferentially, and the first thread-hooking section and the second thread-hooking section have opposite thread-hooking directions.

[0006] Furthermore, the first hooking part hooks in the forward direction, and the second hooking part hooks in the reverse direction; when one of the first hooking part or the second hooking part is a hooking part, the other is a detaching part.

[0007] Furthermore, the first hook portion includes a first hook surface, and the first hook surface is located at the tip of one end face of the shuttle bed;

[0008] The second hooking part includes a second hooking surface, which is located at the tip of the other end face of the shuttle bed, and the second hooking surface is disposed opposite to the first hooking surface.

[0009] Furthermore, the shuttle bed also includes a first guide wire portion corresponding to the first hook portion. The first guide wire portion extends smoothly from the first hook surface of the shuttle bed along the radial and axial directions of the first hook portion to the other end face of the shuttle bed, and the first guide wire portion is connected to the first hook portion; and / or,

[0010] The shuttle bed also includes a second guide wire portion corresponding to the second hook wire portion. The second guide wire portion extends smoothly from the second hook wire surface of the shuttle bed along the radial and axial directions of the second hook wire surface of the shuttle bed to the other end face of the shuttle bed, and the second guide wire portion is connected to the second hook wire portion.

[0011] Furthermore, the first hook section and the second hook section are arranged in a mirror image symmetrically with respect to the center plane of the shuttle bed, and the axis of the shuttle bed is located on the center plane.

[0012] Furthermore, the shuttle bed also includes two counterweight mounting parts arranged opposite to each other, the counterweight mounting parts being located on the end face of the shuttle bed that is relatively far away from the first hooking part or the second hooking part.

[0013] Furthermore, the hooking assembly also includes a bobbin, which covers the outer periphery of the shuttle bed along the circumference of the shuttle bed, and the bobbin includes two thread guides corresponding to the first hooking part and the second hooking part, and a thread loop actuation part disposed between the two thread guides.

[0014] The thread loop actuating part protrudes along the axial direction of the shuttle bed in a direction away from the first thread hooking part and the second thread hooking part, and is smoothly connected to the two thread guide parts.

[0015] Furthermore, the shuttle bed also includes a shuttle bed body, the first hooking part and the second hooking part are respectively located at both ends of the shuttle bed body in the circumferential direction and facing the side of the sewing machine needle mechanism, the shuttle bed body partially extends radially and forms two mounting parts, and the two mounting parts are respectively corresponding to the first hooking part and the second hooking part, and the shuttle skin is fixed to the mounting parts by fasteners.

[0016] Furthermore, each of the mounting portions includes a lead surface that contacts the wire loop, the lead surface being capable of guiding the movement of the wire loop; and / or,

[0017] The mounting portion includes a lead-line surface, which is disposed between the shuttle body and the shuttle skin, and is the side of the mounting portion facing the corresponding first hook portion or second hook portion. The lead-line surface is a smooth curved surface; and / or,

[0018] The two mounting parts are arranged in a mirror-symmetrical manner with respect to the axis of the shuttle bed.

[0019] An embodiment of the present invention also provides a rotary shuttle mechanism, the rotary shuttle mechanism including a hook assembly and a shuttle frame as described in any of the above claims, the hook assembly and the shuttle frame being coaxially arranged, and the shuttle frame being disposed within the shuttle bed, the hook assembly rotating around the shuttle frame.

[0020] Furthermore, the shuttle frame is provided with two thread-separating hooks, which are correspondingly arranged with the first thread-hooking part and the second thread-hooking part, and are used to separate the thread loops to both sides of the shuttle frame axis.

[0021] Furthermore, the shuttle mechanism also includes a shuttle case, which is fixed and installed inside the shuttle frame. The end face of the shuttle case is provided with a wrench portion, and the projection of the wrench portion perpendicular to the end face of the shuttle case is located within the end face area of ​​the shuttle case.

[0022] One embodiment of the present invention also provides a sewing machine, the sewing machine including a hook assembly as described in any of the preceding claims. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the rotary shuttle mechanism in one embodiment of the present invention;

[0024] Figure 2 for Figure 1 The diagram shows the structure of the shuttle frame in the rotary shuttle mechanism.

[0025] Figure 3 for Figure 2 A schematic diagram of the shuttle frame from another perspective;

[0026] Figure 4 for Figure 1 The diagram shows the structure of the shuttle housing in the rotary shuttle mechanism.

[0027] Figure 5 for Figure 1 A schematic diagram of the shuttle bed structure in the hook assembly of the rotary shuttle mechanism shown;

[0028] Figure 6 for Figure 5 The diagram shows the structure of the shuttle bed from another perspective;

[0029] Figure 7 for Figure 1 A schematic diagram of the shuttle skin structure in the hook assembly of the rotary hook mechanism shown;

[0030] Figure 8 for Figure 7 The diagram shows a structural schematic of the ferrule from another perspective.

[0031] Figure 9 for Figure 1 A schematic diagram of the shuttle plate structure in the hook assembly of the rotary hook mechanism shown;

[0032] Figure 10 for Figure 9 A schematic diagram of the shuttle plate from another perspective;

[0033] Figure 11 for Figure 1 A disassembly diagram of the rotary hook mechanism shown;

[0034] Figure 12 for Figure 1 A partial cross-sectional schematic diagram of the rotary shuttle mechanism shown;

[0035] Figure 13 for Figure 12 The diagram shows a partial cross-sectional view of the shuttle bed in the rotary shuttle mechanism after it has rotated a certain angle relative to the shuttle frame.

[0036] Component designation explanation

[0037] 100. Rotary shuttle mechanism;

[0038] 10. Shuttle frame; 11. Bottom thread guide groove; 12. Shuttle case positioning groove; 13. Guide rail; 131. Open loop section; 14. Guide rail cable routing groove; 15. Thread splitting hook; 16. Shuttle frame positioning groove;

[0039] 20. Hook and line assembly;

[0040] 21. Shuttle; 211. Opening; 212. Shuttle body; 213. Mounting part; 2131. Lead wire surface; 214. First hooking part; 2141. First hooking surface; 215. Second hooking part; 2151. Second hooking surface; 216. Guide rail groove; 217. First lead wire part; 218. Second lead wire part; 219. Counterweight mounting part;

[0041] 22. Shuttle skin; 221. Thread guide; 222. Thread loop actuation part;

[0042] 23. Shuttle plate; 231. Assembly section; 232. Guide section; 2321. Curved surface section;

[0043] 30. Shuttle housing; 31. Positioning part; 32. Wrench part;

[0044] 40. Shuttle core;

[0045] 50. Circular space;

[0046] 200. Needle mechanism.

[0047] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a more detailed explanation of the present invention. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of this invention.

[0049] It should be noted that when a component is described as "mounted on" another component, it can be directly on the other component or there may be an intermediate component. When a component is described as "set on" another component, it can be directly set on the other component or there may be an intermediate component. When a component is described as "fixed to" another component, it can be directly fixed to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] Please refer to the following: Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of the rotary shuttle mechanism 100 in one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the shuttle frame 10 in the rotary shuttle mechanism 100 shown; Figure 3 for Figure 2 A schematic diagram of the shuttle frame 10 from another perspective; Figure 4 for Figure 1 A schematic diagram of the structure of the shuttle housing 30 in the rotary shuttle mechanism 100 shown.

[0052] The rotary shuttle mechanism 100 includes a shuttle frame 10 and a hook assembly 20.

[0053] The hook assembly 20 is arranged around the outer periphery of the shuttle frame 10 and connected to the rotary hook drive shaft. The shuttle frame 10 is used to mount the bobbin 40 with the bobbin thread; the hook assembly 20 is used to hook the top thread of the needle mechanism 200 and drive the top thread to form a loop. The hook assembly 20 hooks the top thread and forms a loop; as the loop gradually expands with the rotation of the hook assembly 20, the bobbin thread on the shuttle frame 10 is surrounded by the loop; after the loop tightens, it interweaves with the bobbin thread and forms a stitch on the fabric. With the action of the sewing machine's feed mechanism, the fabric moves along the feed direction; the rotary hook mechanism 100 and the needle mechanism 200 form another stitch at the next position on the fabric; multiple consecutive stitches form a thread on the fabric.

[0054] In one embodiment, the shuttle mechanism 100 further includes a shuttle case 30. The shuttle case 30 is used to mount the bobbin 40 and is fixed to the shuttle frame 10. The bobbin 40 is mounted inside the shuttle frame 10 through the shuttle case 30, facilitating the loading and unloading of the bobbin 40. In this embodiment, the bobbin 40 is fixed to the shuttle frame 10 and is disposed within the space enclosed by the hook-and-loop assembly 20. When the bobbin 40 with the bobbin thread is mounted inside the shuttle frame 10 through the shuttle case 30, the hook-and-loop assembly 20 rotates under the action of the drive shaft, passing the bobbin thread loop through the bobbin 40 with the bobbin thread, so that the bobbin thread passes through the bobbin thread loop and forms interlaced stitches on the fabric.

[0055] It is understood that in other embodiments, if the ease of picking up and putting down the bobbin 40 is not considered, the bobbin case 30 can be omitted accordingly, as long as the bobbin 40 with the bottom line can be fixed relative to the bobbin holder 10.

[0056] In one embodiment, the shuttle housing 30 is provided with a positioning part 31. The shuttle housing 30 is rotated and positioned with the shuttle frame 10 by the radially extending positioning part 31. The shuttle frame 10 is provided with a corresponding shuttle housing positioning groove 12. The positioning part 31 extends into the shuttle housing positioning groove 12 and achieves relative fixation between the shuttle housing 30 and the shuttle frame 10. Here, fixation means that the shuttle housing 30 cannot rotate relative to the shuttle frame 10 and cannot move along the axial direction of the shuttle frame 10.

[0057] Furthermore, the positioning part 31 of the shuttle case 30 is provided with a wrench part 32. The wrench part 32 is connected to the positioning part 31 and can rotate relative to the positioning part 31. The purpose of rotating the wrench part 32 relative to the positioning part 31 is to rotate the end face of the shuttle case 30 out of or flatten it against the end face of the shuttle case 30. When the wrench part 32 rotates to the outside of the end face of the shuttle case 30, the wrench part 32 is easy for the user to grip. While the wrench part 32 is rotating, it can drive the positioning part 31 to move in the mounting groove of the shuttle case 30, thereby moving the positioning part 31 out of the positioning groove to release the relative fixed relationship between the shuttle case 30 and the shuttle frame 10; when the shuttle case 30 is removed as a whole by the wrench part 32, the bobbin 40 installed in the shuttle case 30 can also be removed when the shuttle case 30 is pulled away from the shuttle frame 10 along the axial direction. The wrench part 32 not only releases the locking relationship between the shuttle case 30 and the shuttle frame 10, but also facilitates the removal of the shuttle case 30.

[0058] Preferably, the projection of the wrench portion 32 perpendicular to the end face of the shuttle case 30 is located within the end face area of ​​the shuttle case 30, that is, the wrench portion 32 does not protrude from the outer contour of the end face of the shuttle case 30, thereby preventing the hook assembly 20 from getting tangled in the wrench portion 32 when hooking the loop in the forward or reverse direction.

[0059] Existing hook-and-loop assemblies, due to their single hook-and-loop direction, often make sewing machines unsuitable for the complex working conditions encountered by various sewing machines when forming stitches on fabric. When forming lockstitches, existing hook-and-loop assemblies cannot overcome the tendency for lockstitches to skew to one side. In other specific situations, such as when fabric needs reinforcement through backstitching, lockstitches formed by existing hook-and-loop assemblies often result in multiple stitches skewed in the same direction due to the hook-and-loop direction; furthermore, the skew directions of lockstitches formed by forward and backstitching are precisely different; and when forward and backstitch lockstitches are formed at the same reinforcement location on the fabric, the different skew directions often result in two different stitches. This leads to the drawback that the reinforcement stitches at each reinforcement location cannot overlap during backstitching, resulting in a misaligned "figure-eight" stitch, which is unsightly and produces poor sewing results. Therefore, the lockstitch formed on the fabric by a sewing machine through a hook assembly with a single hook direction is not as aesthetically pleasing.

[0060] To overcome the aforementioned technical problems, one embodiment of the present invention provides an improved hook assembly 20. Please refer to [the relevant document / reference]. Figures 5 to 10 , Figure 5 for Figure 1 A schematic diagram of the structure of the shuttle bed 21 in the hook assembly 20 of the rotary shuttle mechanism 100 shown; Figure 6 for Figure 5 A schematic diagram of the shuttle bed 21 from another perspective; Figure 7 for Figure 1 A schematic diagram of the structure of the shuttle skin 22 in the hook assembly 20 of the rotary shuttle mechanism 100 shown; Figure 8 for Figure 7 A schematic diagram of the structure of the shuttle skin 22 from another perspective is shown; Figure 9 for Figure 1 A schematic diagram of the structure of the shuttle plate 23 in the hook assembly 20 of the rotary shuttle mechanism 100 shown; Figure 10 for Figure 9 A schematic diagram of the shuttle plate 23 from another perspective; Figure 11 for Figure 1 A disassembly diagram of the rotary shuttle mechanism 100 shown.

[0061] The hook-and-loop assembly 20 is equipped with a first hook-and-loop section 214 and a second hook-and-loop section 215 capable of hooking from different directions. It selectively controls either the first hook-and-loop section 214 or the second hook-and-loop section 215 at different positions to create stitches with different hooking directions. For example, in some cases, the first hook-and-loop section 214 hooks in the forward direction, and then the second hook-and-loop section 215 hooks in the reverse direction to form the next stitch, thus creating a stitch with one forward and one reverse hook. In reverse stitching, the hook-and-loop assembly 20 can hook in the exact opposite direction, resulting in two identical lockstitches formed by the forward and reverse stitches. Aesthetically pleasing stitches are a long-standing requirement in the sewing industry. Existing lockstitches exhibit continuous, unidirectional stitch skew, i.e., single-needle stitch skew, which is particularly problematic when sewing thin materials, resulting in unsightly stitches and an unsolvable industry-wide problem. The hook-and-loop assembly 20 designed in this application solves a major problem in the sewing equipment industry.

[0062] However, considering the issue of skewed lockstitch, the idea of ​​correcting the skewed lockstitch by improving the hooking direction of the hook assembly 20 and forming a new type of lockstitch is not found in existing sewing machine technology. Furthermore, given the existing hook assemblies with a single hooking direction, it is difficult to conceive of correcting a skewed lockstitch by hooking the next stitch in the opposite direction. Therefore, overcoming the aforementioned problems by providing a second hooking part 215 capable of hooking in the opposite direction, thus forming a hook assembly 20 capable of hooking in both directions, is a technical approach that would be difficult for someone skilled in the art to conceive of.

[0063] Definition of hooking direction: The hooking direction of the hooking assembly 20 is typically defined by observing the rotation direction of the hooking core 40 within the shuttle carriage 10 from the perspective of its orientation. This rotation direction, often simply called the spiral direction, is the hooking direction of the hooking assembly 20. For example... Figure 1 As shown, when the hook assembly 20 rotates clockwise in the direction F1, the first hook part 214 hooks the opposite line, and the hook assembly 20 hooks in the forward direction; conversely, when the hook assembly 20 rotates counterclockwise, the second hook part 215 hooks the opposite line, and the hook assembly 20 hooks in the reverse direction.

[0064] It should be explained that in this embodiment, the hooking direction of the hooking assembly 20 can be determined as long as the rotation direction of the hooking assembly 20 is determined. The same hooking direction can be used to hook lines from different angles, which is not limited here. In this embodiment, the hooking assembly 20 being able to hook lines from different directions means that the hooking assembly 20 rotates under the action of the drive shaft, and the hooking assembly 20 hooks lines onto the opposite line from different rotation directions. For example, the aforementioned forward hooking and reverse hooking are hooking lines in different directions. Because the hooking assembly 20 can hook lines from different directions, it can also alleviate the problem of easy thread breakage. For example, template machines need to perform 360° sewing, and when sewing at certain angles, thread breakage is likely to occur.

[0065] In this embodiment, the hook assembly 20 is applied to the rotary shuttle mechanism 100. Since the rotation of a conventional rotary shuttle is always a continuous, unidirectional rotation, simultaneously providing the first hook portion 214 and the second hook portion 215, capable of hooking lines from either the forward or reverse direction, in the hook assembly 20 of the rotary shuttle mechanism 100 is a technical solution that would be difficult for someone skilled in the art to conceive of. It is understood that in other embodiments, this hook assembly 20 can also be applied to a swing shuttle mechanism, simply by configuring the hook portion of the swing shuttle mechanism to hook lines from different directions.

[0066] It should be explained that although the hook-and-draw component 20 in this application can draw lines from different directions, the stitches formed by the hook-and-draw component 20 are not limited to the novel lock-stitch formed by alternating forward and reverse stitches. The stitches formed by the hook-and-draw component 20 in this application can be formed by multiple continuous forward hook-and-draw stitches, or by multiple continuous reverse hook-and-draw stitches, or by a combination of multiple forward hook-and-draw stitches and multiple reverse hook-and-draw stitches.

[0067] like Figure 1 As shown, the hook assembly 20 includes a shuttle bed 21 and a shuttle skin 22. The shuttle bed 21 is rotatably mounted on a drive shaft and rotates about the axis of the drive shaft under its action. The shuttle skin 22 guides the movement of the thread loop and moves it away from the end face of the shuttle housing 30 to prevent the thread loop from winding around the end face of the shuttle housing 30. It is understood that in other embodiments, if the problem of thread loop winding is not considered, the shuttle skin 22 can be omitted accordingly.

[0068] like Figure 5 and Figure 6As shown, the shuttle 21 is generally an annular structure with an opening 211. The shuttle 21 includes a shuttle body 212, a first hooking portion 214, and a second hooking portion 215. The shuttle body 212 is an annular shuttle body 212 with the aforementioned opening 211; and the opening 211 is located on the side of the shuttle body 212. The first hooking portion 214 and the second hooking portion 215 are respectively provided on opposite sides of the opening 211 of the shuttle body 212; and the first hooking portion 214 and the second hooking portion 215 are arranged opposite to each other. The shuttle body 212 is used to connect the drive shaft and serves as a carrier for the functional components of the shuttle 21. The first hooking portion 214 and the second hooking portion 215 are used for forward hooking and reverse hooking, respectively. The first hooking portion 214 can rotate clockwise with the shuttle body 212 and hook the opposite line; the second hooking portion 215 can rotate counterclockwise with the shuttle 21 and hook the opposite line.

[0069] It is understood that in other embodiments, if the installation of other components is not considered, the shuttle body 212 can be omitted accordingly, as long as the first hooking part 214 and the second hooking part 215 can hook lines in different directions; if the dynamic balance when the shuttle 21 rotates is not considered, the shape of the shuttle body 212 can also be set to other structures, as long as the function of the first hooking part 214 and the second hooking part 215 hooking lines in different directions can be realized.

[0070] In this embodiment, when the first hooking part 214 hooks the line in the forward direction, the second hooking part 215 is the corresponding loosening part; when the second hooking part 215 hooks the line in the reverse direction, the first hooking part 214 is the corresponding loosening part.

[0071] In one embodiment, the shuttle body 212 has a guide groove 216 on the side facing the shuttle frame 10. Correspondingly, as... Figure 2 As shown, the outer periphery of the shuttle frame 10 is provided with a guide rail 13 that can extend into the guide rail groove 216. The guide rail 13 protrudes from the outer periphery of the shuttle frame 10 and is partially arranged around the circumference of the shuttle frame 10, that is, the guide rail 13 of the shuttle frame 10 has an open-loop section 131. The guide rail 13 and the guide rail groove 216 cooperate with each other and are used to enable the shuttle bed 21 to rotate along the circumference of the shuttle frame 10 and along a predetermined path of the guide rail 13. It can be understood that in other embodiments, the positions of the guide rail 13 and the guide rail groove 216 can be interchanged, that is, the shuttle bed is provided with a guide rail 13 and the shuttle frame 10 has a guide rail groove 216, as long as the shuttle bed 21 can rotate along a predetermined path around the outer periphery of the shuttle frame 10.

[0072] Of course, the shuttle bed 21 in this embodiment is also provided with oil holes (unlabeled), lubrication oil grooves (unlabeled), etc., but these are not the focus of this application and will not be described in detail here.

[0073] In one implementation, such as Figure 2As shown, the outer contour of the shuttle frame 10 is provided with thread dividers 15 corresponding to the first hooking portion 214 and the second hooking portion 215. The thread divider 15 is a pointed hook formed by the contraction of the end of the guide rail 13 of the shuttle frame 10, and is provided on opposite sides of the shuttle frame 10. The thread divider 15 can be used to separate the thread loop or correspondingly unwind the thread when the first hooking portion 214 or the second hooking portion 215 hooks the thread. This arrangement allows the thread dividers on the shuttle frame 10 to be respectively positioned to correspond to the two hooking portions.

[0074] The basic similarities with existing technologies are: such as Figure 5 As shown, the shuttle guide groove 216 of the shuttle body 212 has a two-section opening structure. After the shuttle body 212 and the shuttle plate 23 are combined, a C-shaped guide groove is formed to install and axially fix the shuttle frame 10 inside the shuttle 21. Furthermore, because, as... Figure 2 As shown, the rotary hook positioning hook ( Figure 11 (Unmarked) is inserted into the shuttle positioning groove 16 of the shuttle 10 to radially position the shuttle 10.

[0075] Unlike existing technologies, the guide rail 13 of the shuttle frame 10 is provided with a split hook 15 at both ends. The position of the split hook 15 is mirror-symmetrical along the center plane of the shuttle frame 10, and the two split hooks 15 have the function of separating / removing the thread loop at the same time; thus, it has the function of bidirectional hooking / removing thread.

[0076] It should be noted that a certain distance needs to be maintained between the two ends of the split hook 15 and the guide rail 13.

[0077] The existing rotary shuttle's shuttle frame does not have a split hook that can disengage the top thread loop; similarly, the guide rail end of the existing rotary shuttle frame does not have a function to separate the top thread loop.

[0078] Preferably, such as Figure 2 As shown, the guide rail 13 of the shuttle frame 10 of the present invention is provided with a plurality of guide rail wiring grooves 14 in the middle part, and similarly, their positions are mirror-symmetrical along the center plane of the shuttle frame.

[0079] The angle θ between the guide rail cable tray 14 slot closest to the split hook 15 and the axis of the split hook 15 and the shuttle 10 is preferably at least 90°. If the guide rail cable tray 14 slot is too close to the split hook 15, the wire loop may get caught on the guide rail cable tray 14 slot when it comes off, causing the wire to break.

[0080] The shuttle frame 10 is also provided with a shuttle housing positioning groove 12.

[0081] Please see Figure 12 and Figure 13 , Figure 12 for Figure 1 A partial cross-sectional schematic diagram of the rotary shuttle mechanism shown; Figure 13 for Figure 12 The diagram shows a partial cross-sectional view of the shuttle bed 21 in the rotary shuttle mechanism after it has rotated a certain angle relative to the shuttle frame 10.

[0082] In this embodiment, such as Figure 1 , Figure 12 and Figure 13 As shown, an annular space 50 is formed between the open-loop section 131 of the guide rail 13 of the shuttle frame 10 and the inner wall of the guide rail groove 216, which changes with the rotation of the shuttle bed 21, so as to allow the surface thread ring to move. Figure 12 This is a cross-sectional view of the annular space 50 formed by the open-loop section 131 of the guide rail 13 of the shuttle frame 10 and the guide rail groove 216 when the hook assembly 20 is at an angle. Figure 13 This is a cross-sectional view of the annular space 50 formed by the open-loop section 131 of the shuttle guide rail 13 and the guide rail groove 216 when the hook assembly 20 is rotated to another angle.

[0083] The thread loop formed by the first hooking part 214 or the second hooking part 215 can enter the annular space 50 accordingly. After the thread loop enters the annular space 50, the annular space 50 will move at the same speed as the shuttle bed 21. When the shuttle bed 21 rotates to the point where the guide rail groove 216 can no longer close the open section 131 of the guide rail 13 of the shuttle frame 10, the annular space 50 is opened. The thread loop enters or exits the annular space 50 due to the combined action of the thread splitting hook 15 of the shuttle frame 10 and the lead-in part of the shuttle bed 21. When the shuttle bed 21 rotates to the point where the guide rail groove 216 closes the open section 131 of the guide rail 13, the annular space 50 is closed. At this time, the thread loop can only slide along the surface of the shuttle frame 10 body as the shuttle bed 21 rotates and cannot be dislodged.

[0084] In one embodiment, the shuttle body 212 extends radially in part to form two mounting portions 213. The two mounting portions 213 are respectively provided corresponding to the first hook portion 214 and the second hook portion 215, that is, the mounting portions 213 are arranged in a mirror-symmetrical manner along the center plane of the shuttle 21. The mounting portions 213 have countersunk grooves (not labeled); the mounting portions 213 secure the shuttle 21 and the shuttle skin 22 together with fasteners. The symmetrical arrangement of the two mounting portions 213 prevents the shuttle 21 from easily deviating from its axis during rotation, thus ensuring the dynamic balance of the shuttle 21.

[0085] It is understood that in other embodiments, if the installation of other components is not considered, the mounting part 213 can be omitted accordingly, as long as the first hooking part 214 and the second hooking part 215 can hook in different directions.

[0086] Furthermore, each mounting portion 213 includes a lead surface 2131 that contacts the thread loop. The lead surface 2131 guides the thread loop to expand and hook the thread. The lead surface 2131 guides the movement of the thread loop through its shape features, and can also prevent the thread located on one side of the split hook 15 from sliding into the other side of the split hook 15. When the first hook portion 214 or the second hook portion 215 hooks the thread loop, the lead surface 2131 prevents the thread loop from continuing to move away from the first hook portion 214 or the second hook portion 215, and instead causes the thread loop to continue to expand and form a large thread loop as the first hook portion 214 or the second hook portion 215 moves.

[0087] Preferably, the lead surface 2131 is the side of the mounting part 213 facing the corresponding first hook part 214 and second hook, and the lead surface 2131 is a smoothly connected curved surface. This configuration can avoid the problem of the lead loop getting caught or tangled.

[0088] The first hook portion 214 is roughly a pointed structure at the opening 211 of the annular shuttle bed 21, and is located at one end face of the shuttle bed 21. The needle mechanism 200 is generally positioned above the shuttle bed 21 and is roughly aligned with the end face of the shuttle bed 21 where the first hook portion 214 is located. During the process of the needle mechanism 200 moving the top thread towards the shuttle bed 21 to its lowest point and then moving the top thread back to its original position, a top thread loop is formed. The first hook portion 214 or the second hook portion 215 of the shuttle bed 21 intersects with the needle mechanism 200 and hooks the top thread loop. Under the action of the first hook portion 214 or the second hook portion 215, the top thread loop expands as the shuttle bed 21 rotates. After the shuttle bed 21 has rotated approximately half a turn, the top thread loop tightens and disengages from the shuttle bed 21 under the action of the sewing machine's take-up mechanism. Thus, the top thread loop interweaves with the bottom thread located within the shuttle frame 10, forming a stitch on the fabric.

[0089] Here, the process of hooking the thread using either the first hooking part 214 or the second hooking part 215, and interweaving the top thread loop with the bottom thread to form a stitch, is largely the same as in the prior art and will not be described in detail here. However, it should be emphasized that the first hooking part 214 and the second hooking part 215 can each serve as the other's unhooking part. For example, when the first hooking part 214 hooks the thread, the resulting top thread loop comes off via the second hooking part 215, meaning the second hooking part 215 can serve as the unhooking part corresponding to the first hooking part 214 hooking the thread; conversely, the first hooking part 214 can serve as the unhooking part corresponding to the second hooking part 215 hooking the thread. Furthermore, the terms "above" or "lowest point" mentioned in this application refer to the spatial position of the sewing machine when it is in use.

[0090] In one embodiment, the first hooking portion 214 includes a first hooking surface 2141 disposed on the rotation plane of the shuttle 21. The first hooking surface 2141 is located at the tip of the end face of the shuttle 21 corresponding to the needle mechanism 200. The provision of the first hooking surface 2141 can increase the position of the first hooking portion 214 for contact with the thread, and perform accurate hooking action, and can also avoid the problem of collision with the needle mechanism 200.

[0091] It should be explained that the rotation plane of shuttle 21 refers to one of the planes perpendicular to the rotation axis of shuttle 21.

[0092] Furthermore, the second hooking portion 215 includes a second hooking surface 2151 disposed on the rotation plane of the shuttle 21. The second hooking surface 2151 is located at the tip of the end face of the shuttle 21 corresponding to the needle mechanism 200, and is disposed opposite to the first hooking portion 214. The function and effect of the second hooking surface 2151 are the same as those of the first hooking surface 2141, and will not be described in detail here.

[0093] Of course, in this embodiment, the first hooking surface 2141 and the second hooking surface 2151 can be set according to actual needs, or only one can be set or neither can be set, as long as the hooking function of the first hooking part 214 and the second hooking part 215 can be realized.

[0094] In one embodiment, the first hooking portion 214 and the second hooking portion 215 are arranged in a mirror-symmetric manner with respect to the center plane of the shuttle bed 21. In this embodiment, the center plane refers to a plane that can extend to the axis of the shuttle bed 21. With this arrangement, when the first hooking portion 214 and the second hooking portion 215 have the same shape and structure, the stitches formed by the hooking of the two are uniform, and there will be no problem of inconsistent stitch tightness, resulting in aesthetically pleasing stitches.

[0095] In one embodiment, the shuttle 21 further includes a first guide wire portion 217 corresponding to the first hook portion 214. The first guide wire portion 217 extends smoothly from the first hook surface 2141 of the shuttle 21 along the radial and axial directions of the first hook portion 214 to the other end face of the shuttle body 212, and is connected to the first hook portion 214. Since the first guide wire portion 217 is correspondingly provided to the first hook portion 214, it is also located on one side of the opening 211. The first guide wire portion 217 is a tangential surface formed by connecting a diagonal line extending radially and axially on the inner surface of the shuttle 21 and a diagonal line extending radially and axially on the outer surface of the shuttle body 212. The diagonal line on the outer surface of the first guide wire portion 217 is used to enlarge the thread loop; the diagonal line on the inner surface of the first guide wire portion 217 is used to enlarge the thread loop towards the axis of the rotary shuttle. The first lead wire portion 217 is used to cooperate with the first hook portion 214 to hook the wire, and to further expand the wire loop along the axial direction of the shuttle bed 21 to both sides of the axial direction of the shuttle bed 21.

[0096] Furthermore, the first lead portion 217 and the first hook portion 214 are smoothly connected. This arrangement can prevent the first lead portion 217 from hooking with the wire loop.

[0097] In one embodiment, the shuttle 21 further includes a second guide wire portion 218 corresponding to the second hook portion 215. The structure and function of the second hook portion 215 are largely the same as those of the first hook portion 214, and will not be described in detail here.

[0098] It is understandable that the first lead part 217 and the second lead part 218 can be omitted or one of them can be set, as long as the first hook part 214 and the second hook part 215 can hook smoothly.

[0099] In one embodiment, the overall weight distribution of the shuttle 21 changes due to the presence of two hook sections on the shuttle body 212. To maintain the overall dynamic balance of the shuttle 21 and prevent wear and noise caused by eccentric rotation, the shuttle body 212 is equipped with a counterweight mounting section 219. The counterweight mounting section 219 is located on the end face of the shuttle body 212 relatively far from the first hook section 214 or the second hook section 215. Each counterweight mounting section 219 can accommodate at least one counterweight or have a certain amount of material removed from the body. This configuration allows the shuttle 21 to be equipped with corresponding counterweights based on its weight distribution, thus preventing eccentricity and other problems during rotation.

[0100] Furthermore, the counterweight mounting section 219 has two notches located on the shuttle body 212 away from the hook section, and a connecting part of the shuttle body 212 for connecting with the drive shaft is sandwiched between the two counterweight mounting sections 219. This arrangement facilitates the connection and operation of the shuttle 21 with the drive shaft.

[0101] In one implementation, such as Figure 7 and Figure 8 As shown, the bobbin 22 is generally a ring-shaped structure with a lateral opening (not labeled), and the bobbin 22 covers the outer periphery of the shuttle bed 21. During installation, the opening 211 of the bobbin 22 is set to correspond to the opening 211 of the shuttle bed 21, that is, after installation, the two have overlapping opening 211 spaces, so that the thread loop can enter or exit the annular space 50 from the overlapping opening 211.

[0102] In one embodiment, one side of the bobbin 22 is flush along the axial direction, while the other side is a continuously curved wavy surface; the two sides combine to form a pointed structure at both ends of the bobbin 22 circumferentially, which is the suture guide 221 of the bobbin 22. The suture guide 221 is used to guide the suture; when the hook assembly 20 hooks the suture in any direction, one of the two suture guides 221 blocks the suture loop, and then guides the suture loop to slide along the wavy surface of the bobbin 22.

[0103] Preferably, the wavy side of the bobbin 22 forms a loop-shifting portion 222 in the middle section that is higher than the sides. Two thread guide portions 221 are symmetrically arranged relative to the loop-shifting portion 222. The highest point of the loop-shifting portion 222 forms the widest part of the bobbin 22. This arrangement ensures that when the loop moves with the shuttle bed 21 to the position of the largest loop, the loop-shifting portion 222 of the bobbin 22 just contacts the loop, and pushes the top thread of the loop located on the end face of the bobbin case 30 away from the end face of the bobbin case 30, thereby allowing the loop to wrap around and fit the bottom thread inside the bobbin case 30, and preventing entanglement between the top thread and the bobbin case 30.

[0104] In one implementation, such as Figure 9 and Figure 10As shown, the shuttle bed 21 has a shuttle plate 23 located opposite the opening 211 of the shuttle bed 21. The shuttle plate 23 includes an assembly part 231 and a guide part 232 that are fixed to each other. The assembly part 231 is generally a curved plate structure and is correspondingly disposed between the two mounting parts 213 of the shuttle bed 21; the guide part 232 is formed by radially contracting from one end face of the assembly part 231. The assembly part 231 is used to fix and fit between the two mounting parts 213 of the shuttle bed 21 to fix the lead wire part to the shuttle bed 21. When the wire loop enters the annular space 50 under the action of the first hook part 214 or the second hook part 215, the wire loop is guided to move within the annular space 50 by the guide part 232 of the shuttle plate 23 in sequence, avoiding the problem of wire snagging or tangling.

[0105] Preferably, the assembly part 231 and the guide wire part 232 are integrally formed. This arrangement facilitates the processing and installation of the shuttle plate 23.

[0106] Furthermore, the annular conductor portion 232 is provided with curved surfaces 2321 on both sides for guiding the wire loop.

[0107] The working principle of the rotary hook mechanism 100 will be explained in detail below through its three working states:

[0108] First working state: Combination Figure 1 and Figure 11 The drive shaft drives the hook assembly 20 to rotate clockwise; at the same time, the needle mechanism 200 with the top thread passes through the fabric to the lowest point, and after rising a certain distance, forms a top thread loop; the first hook surface 2141 of the first hook part 214 of the forward hooking part intersects with the needle mechanism 200 and hooks the top thread loop. The oblique lines on the outer surface of the first lead wire portion 217 expand the thread loop to the right, and the oblique lines on the inner surface of the first lead wire portion 217 expand the thread loop towards the center of the rotary hook. The hook assembly 20 continues to rotate clockwise, and the thread separating hook 15, which is provided on the guide rail 13 of the shuttle frame 10 corresponding to the first hook portion 214, intersects with the oblique lines on the inner surface of the first lead wire portion 217. Since the thread loop is pulled towards the center of the rotary hook by the oblique lines on the inner surface of the first lead wire portion 217, the thread loop is located at the root of the thread separating hook 15 when they intersect, thus ensuring that the thread loop can be accurately separated. The thread separating hook 15 separates the thread loop to the left and right sides of the shuttle frame 10 body.

[0109] At this point, the top thread enters the annular space 50 formed by the open-loop section 131 of the guide rail 13 of the shuttle frame 10 and the guide rail groove 216, and begins to slide around the irregular flattened spherical surface of the shuttle frame 10 / shuttle shell 30 assembly; during the sliding process, as the shuttle bed 21 rotates further, the top thread loop is gradually enlarged; the top thread loop slides over the guide wire section 232 of the shuttle plate 23; the rotary shuttle continues to rotate clockwise, and the stitch guide section 221 of the shuttle skin 22, which is relatively close to the first hook section 214, and the thread guide surface 2131 of the mounting section 213 work together to block the thread loop; both begin to rotate the top thread loop to the right at a certain angle to prevent The stop ring is pulled along the axial direction of the shuttle bed 21 to the side of the shuttle bed 21 that is relatively far away from the first hooking part 214; the thread loop continues to slide around the surface of the shuttle frame 10 / shuttle case 30 assembly; the hooking assembly 20 continues to rotate clockwise, and the top thread loop reaches the thread loop actuating part 222 of the shuttle skin 22. The thread loop actuating part 222 gradually actuates the thread loop along the axial direction of the shuttle frame 10 and in a direction relatively far away from the end face of the shuttle case 30; the thread loop passes over the end face and outer contour of the shuttle frame 10 and over the lever part 32 of the shuttle case 30, and the thread loop continues to expand accordingly as the shuttle bed 21 rotates; the sewing guide part 221 of the shuttle skin 22 pushes the top thread loop to continue rotating to the right. When the hook assembly 20 rotates to the 180° position, the highest point of the thread loop actuation part 222 of the shuttle skin 22 pushes the thread loop to the leftmost side of the shuttle frame 10. The thread loop passes over the positioning groove of the shuttle frame 10, the outline of the shuttle frame 10, and the maximum outline on the left side of the shuttle case 30. At this time, the thread loop expands to the maximum thread loop as the shuttle bed 21 rotates. The hook assembly 20 continues to rotate clockwise, and the thread loop continues to rotate to the right. Under the action of the thread take-up mechanism, the thread loop begins to gradually tighten. At this time, the thread loop slides from one end of the annular space 50 to the other end, and the thread loop passes over the guide wire part 232 of the shuttle plate 23.

[0110] The hook-and-loop assembly 20 continues to rotate clockwise, and the annular space 50 is no longer closed; the thread loop completely bypasses the shuttle frame 10 / shuttle case 30 assembly and disengages from it, and the thread loop is fitted with the bobbin thread and intertwines with the bobbin thread. The hook-and-loop assembly 20 continues to rotate clockwise, the top thread continues to be tightened, and the top thread loop and bobbin thread continue to rotate to the right. The feeding mechanism pushes the fabric by one stitch length until the stitch is completely tightened, at which point a right-handed stitch in a lockstitch is formed.

[0111] The second working state is exactly the opposite of the above process. The rotary shuttle mechanism 100 hooks the thread in the opposite direction, forming a left-handed locking stitch. The specific process is roughly the same as the first working state, but the rotation direction of the shuttle bed 21 and the shuttle skin 22 is opposite, which will not be described in detail here.

[0112] The third working state: the shuttle mechanism 100 reciprocates and rotates to hook the line, and the first hooking part 214 and the second hooking part 215 of the shuttle bed 21 hook the line in opposite directions. The process is roughly the same as the first and second working states described above, and will not be repeated here.

[0113] The difference is that when the drive shaft drives the rotary hook mechanism 100 to run, it rotates 360° clockwise to complete the right-hand stitch formed by hooking the thread in the clockwise direction. After this, the hook assembly 20 does not need to rotate 360° again. Instead, after completing the thread removal action, it can perform a slower rotation speed and a shorter rotation distance, or gradually approach zero degrees of rotation, or directly stay at the thread removal position, waiting for the next loop to appear and start rotating. When the needle mechanism 200 and the feeding mechanism enter the next cycle, and the needle mechanism 200 reaches the lowest point and rises back to form a loop, the hook assembly 20 rotates 360° counterclockwise to complete the left-hand stitch formed by hooking the thread in the reverse direction.

[0114] This technical solution utilizes the alternating reciprocating rotation of the rotary hook, with one forward hook followed by one reverse hook, to create a novel lockstitch. This lockstitch can be arranged in various ways: one right-left-right-left…n…one right-left; one left-right-left-right…n…one left-right. However, the novel lockstitch can also be formed by other combinations of left-hand and right-hand stitches. On the fabric being sewn, the alternating left-right lockstitch created by one left-hand and one right hook ensures that the direction of each stitch is parallel to the overall stitch direction, preventing individual stitches from becoming skewed.

[0115] One embodiment of the present invention provides a hooking assembly. By setting a first hooking part and a second hooking part with different hooking directions, the drawbacks of the original single-direction hooking assembly are overcome. This allows the hooking assembly to obtain two overlapping sewing stitches when sewing forward and backward, greatly improving the aesthetics of the sewing stitches.

[0116] 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.

[0117] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A thread-hooking assembly, comprising a shuttle bed rotatably mounted within a sewing machine, the shuttle bed being rotatable about an axis, characterized in that, The shuttle bed includes a first hook section and a second hook section arranged circumferentially, and the hooking directions of the first hook section and the second hook section are opposite; the shuttle bed also includes two counterweight mounting sections arranged opposite to each other, the counterweight mounting sections are located at the end face of the shuttle bed that is relatively far away from the first hook section or the second hook section, and each counterweight mounting section is used to install at least one counterweight or cut off a certain part of the body to adjust the dynamic balance of the entire shuttle bed; The first hooking part hooks in the forward direction, and the second hooking part hooks in the reverse direction; when either the first hooking part or the second hooking part is a hooking part, the other is a detaching part.

2. The hook assembly according to claim 1, characterized in that, The first hooking part includes a first hooking surface, which is located at the tip of one end face of the shuttle bed; The second hooking part includes a second hooking surface, which is located on the other end face of the shuttle bed, and the second hooking surface is disposed opposite to the first hooking surface.

3. The hook assembly according to claim 2, characterized in that, The shuttle bed further includes a first guide wire portion corresponding to the first hook portion. The first guide wire portion extends smoothly from the first hook surface of the shuttle bed along the radial and axial directions of the first hook portion to the other end face of the shuttle bed, and the first guide wire portion is connected to the first hook portion; and / or, The shuttle bed also includes a second guide wire portion corresponding to the second hook wire portion. The second guide wire portion extends smoothly from the second hook wire surface of the shuttle bed along the radial and axial directions of the second hook wire portion of the shuttle bed to the other end face of the shuttle bed, and the second guide wire portion is connected to the second hook wire portion.

4. The hook assembly according to claim 1, characterized in that, The first hook section and the second hook section are arranged in a mirror image symmetrically with respect to the center plane of the shuttle bed, and the axis of the shuttle bed is located on the center plane.

5. The hook assembly according to claim 1, characterized in that, The hooking assembly also includes a bobbin, which covers the outer periphery of the shuttle bed along the circumference of the shuttle bed. The bobbin includes two thread guides corresponding to the first hooking part and the second hooking part, and a thread loop actuation part disposed between the two thread guides. The thread loop actuating part protrudes along the axial direction of the shuttle bed in a direction away from the first thread hooking part and the second thread hooking part, and is smoothly connected to the two thread guide parts.

6. The hook assembly according to claim 5, characterized in that, The shuttle bed also includes a shuttle bed body. The first hooking part and the second hooking part are respectively located at both ends of the shuttle bed body in a circumferential direction and facing the side of the sewing machine needle mechanism. The shuttle bed body extends radially in a partial manner and forms two mounting parts. The two mounting parts are respectively provided corresponding to the first hooking part and the second hooking part. The shuttle skin is fixed to the mounting parts by fasteners.

7. The hook assembly according to claim 6, characterized in that, Each of the mounting portions includes a lead surface that contacts the wire loop, the lead surface being capable of guiding the movement of the wire loop; and / or, The mounting portion includes a lead-line surface, which is disposed between the shuttle body and the shuttle skin, and is the side of the mounting portion facing the corresponding first hook portion or second hook portion. The lead-line surface is a smooth curved surface; and / or, The two mounting parts are arranged in a mirror-symmetrical manner with respect to the axis of the shuttle bed.

8. A rotary shuttle mechanism, characterized in that, The shuttle mechanism includes a hook assembly and a shuttle frame as described in any one of claims 1 to 7, wherein the hook assembly and the shuttle frame are coaxially arranged, and the shuttle frame is disposed inside the shuttle bed, and the hook assembly rotates around the shuttle frame.

9. The rotary shuttle mechanism according to claim 8, characterized in that, The shuttle frame is provided with two thread-separating hooks, which are corresponding to the first thread-separating part and the second thread-separating part, and are used to separate the thread loops to both sides of the shuttle frame axial direction.

10. The rotary shuttle mechanism according to claim 8, characterized in that, The shuttle mechanism also includes a shuttle case, which is fixed and installed inside the shuttle frame. The end face of the shuttle case is provided with a wrench portion, and the projection of the wrench portion perpendicular to the end face of the shuttle case is located within the end face area of ​​the shuttle case.

11. A sewing machine, characterized in that, The sewing machine includes the hook assembly as described in any one of claims 1 to 7.

Images