Towel embroidery presser foot device and towel embroidery machine

Abstract

The invention discloses a towel embroidery presser foot device and a towel embroidery machine, and belongs to the technical field of embroidery equipment.The towel embroidery presser foot device comprises a towel presser foot shaft with a towel presser foot arranged at the bottom, a towel presser foot driving assembly used for driving the towel presser foot shaft to move up and down, and a swing supporting assembly with a swing fulcrum. The swing supporting assembly is connected with the towel presser foot shaft and moves up and down along with the towel presser foot shaft, the towel presser foot shaft comprises a connecting section connected with a towel presser foot, and a swing node movably matched with a swing fulcrum is arranged on the connecting section, so that when the towel presser foot is subjected to external force, the connecting section swings around the swing fulcrum. When the tabouret drives the cloth to move, the presser foot can synchronously deflect around the fulcrum along with the movement direction of the cloth, so that relative sliding between the presser foot and the cloth is converted into fitting follow-up, cloth pushing force generated by sliding is thoroughly eliminated, and the requirement that the presser foot presses the cloth but does not push the cloth is met.

Description

Technical Field

[0001] This invention belongs to the field of embroidery equipment technology, specifically relating to a towel embroidery machine. Background Technology

[0002] Currently, most towel presser feet on the market have a fixed radial position, meaning they cannot swing. During towel embroidery, when the towel machine frame moves, the towel presser foot remains pressed against the fabric (the towel machine frame begins to move when the needle moves upwards away from the fabric, and the towel presser foot only lifts and detaches from the fabric during the second needle insertion). This creates a sliding friction between the towel presser foot and the fabric, which acts along the direction of fabric movement, directly causing the fabric to be "pushed" and the embroidery to shift. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide a towel embroidery presser foot device and a towel embroidery machine, which can realize the swinging of the towel presser foot to avoid the towel presser foot pushing the cloth and causing the embroidery to shift.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: First, a towel embroidery presser foot device is provided, including a towel presser foot shaft with a towel presser foot at the bottom, a towel presser foot drive assembly for driving the towel presser foot shaft to move up and down, and a swing support assembly with a swing fulcrum. The swing support assembly is connected to the towel presser foot shaft and moves up and down with the towel presser foot shaft. The towel presser foot shaft includes a connecting section connected to the towel presser foot. The connecting section is provided with a swing node that movably cooperates with the swing fulcrum, so that when the towel presser foot is subjected to external force, the connecting section swings around the swing fulcrum.

[0005] Preferably, the swing support assembly includes a connecting sleeve with a swing fulcrum groove on its inner wall, the towel presser foot shaft passes through the connecting sleeve, and the swing node includes a spherical part that mates with the swing fulcrum groove.

[0006] Preferably, the towel presser foot shaft further includes a drive section disposed above the connecting section, the drive section being connected to the towel presser foot drive assembly, the spherical part being integrally connected to the connecting section and having a diameter larger than the connecting section, the spherical part being separately disposed from the drive section, the diameter of the drive section being larger than the connecting section, and a radial gap being provided between the connecting section and the connecting sleeve.

[0007] Preferably, the swing support assembly further includes a first clamp, which is fixed to the upper end of the connecting sleeve, fixing the upper end of the connecting sleeve to the lower end of the drive section, and the upper end of the connecting sleeve is provided with at least one axially extending clamping gap in the circumferential direction.

[0008] Preferably, the lower axial end of the engagement gap has an axial spacing distance with the swing fulcrum groove; and / or, the axial cross section of the swing fulcrum groove is arc-shaped, and the upper side is connected to the inner wall of the upper end of the connecting sleeve, and the diameter of the lower side is smaller than the diameter of the spherical part.

[0009] Preferably, the swing support assembly further includes an elastic support member, the lower end of which is connected to the towel presser foot and the upper end of which is connected to the connecting sleeve. The elastic support member provides elastic support to the towel presser foot shaft when the towel presser foot shaft swings.

[0010] Preferably, the swing support assembly further includes a second clamp and a third clamp, wherein the second clamp fixes the elastic support to the connecting sleeve, and the third clamp fixes the elastic support to the towel presser foot; and / or, the elastic support is a cylindrical spring.

[0011] Preferably, it also includes a towel embroidery machine housing, the bottom of which is provided with a sliding sealing hole that runs vertically through the machine, and the swing support assembly is slidably and sealingly connected to the sliding sealing hole.

[0012] Preferably, the bottom of the towel embroidery machine housing is provided with a through hole, a sliding sealing sleeve is installed in the through hole, and the sliding sealing hole is located in the sliding sealing sleeve.

[0013] In addition, a towel embroidery machine is provided, including a towel embroidery machine head, wherein the towel embroidery machine head includes the towel embroidery presser foot device.

[0014] The technical solution adopted in this invention has the following beneficial effects: The towel embroidery presser foot device is equipped with a swing support assembly. The swing support assembly is connected to the towel presser foot shaft and moves up and down with the towel presser foot shaft. When the towel machine embroidery frame moves, the towel presser foot shaft and the swing support assembly stay at the set up and down positions. The towel presser foot is still pressing the fabric. Therefore, when the fabric moves together with the towel machine embroidery frame, it will generate a pushing force on the towel presser foot.

[0015] The swing support assembly has a swing fulcrum. The towel presser foot shaft includes a connecting section connected to the towel presser foot. The connecting section has a swing node that movably engages with the swing fulcrum, so that when the towel presser foot is subjected to external force, the connecting section swings around the swing fulcrum. That is, a swing joint is formed between the swing node and the swing fulcrum. The swing support assembly limits the swing trajectory of the presser foot shaft through the swing fulcrum, so that the connecting section of the towel presser foot shaft can only make a small-angle flexible swing around the fulcrum. When the embroidery frame moves the fabric, the presser foot can swing synchronously around the fulcrum with the direction of fabric movement, so that the relative sliding between the presser foot and the fabric is transformed into a close-fitting follow-up, completely eliminating the pushing force caused by sliding, realizing the requirement of "presser foot presses the fabric but does not push the fabric", ensuring the positioning accuracy of the embroidery and preventing the embroidery from shifting.

[0016] The swing support assembly includes a connecting sleeve with a swing fulcrum groove on its inner wall. The towel presser foot shaft passes through the connecting sleeve, and the swing node includes a spherical part that mates with the swing fulcrum groove. According to the shape of the swing fulcrum groove described below, the swing fulcrum groove is similar to a hemisphere or other curved surface. The spherical part mates with the swing fulcrum groove to form a unique and fixed swing fulcrum. Furthermore, because the distance the towel machine embroidery frame moves is small (from the start of the embroidery frame to the moment the towel presser foot lifts up and detaches from the fabric during the second stitch), the towel presser foot shaft can only swing around this fulcrum at a small angle, completely defining the swing trajectory and center of the presser foot shaft. When the embroidery frame moves the fabric, the presser foot swings adaptively around the fulcrum in sync with the fabric's movement direction, transforming the rigid relative sliding between the presser foot and the fabric into a close-fitting, follow-up contact. Only the vertical pressing pressure is retained, completely eliminating the pushing force caused by lateral sliding friction.

[0017] The towel presser foot shaft also includes a drive section located above the connecting section. The drive section is connected to the towel presser foot drive assembly. The spherical part is integrally connected to the connecting section and has a diameter larger than the connecting section. The spherical part and the drive section are separate, and the diameter of the drive section is larger than that of the connecting section. In this way, the towel presser foot shaft is designed as a three-section structure of drive section (large diameter) + spherical part + connecting section (small diameter). The spherical part has a larger diameter than the connecting section, which creates a uniform annular gap between the connecting section and the inner wall of the connecting sleeve. When the presser foot shaft (spherical part and connecting section) swings, only the spherical part contacts the spherical surface of the swing fulcrum groove. The connecting section does not rub or get stuck with the inner wall of the sleeve. This gap provides sufficient space for the swing of the connecting section. Moreover, due to the coaxiality advantage of the integral spherical part and the connecting section, the gap is evenly distributed circumferentially, eliminating the risk of interference caused by excessively small local gaps. The spherical section has a larger diameter than the connecting section. When both are inserted into the connecting sleeve from top to bottom, the lower side of the spherical section will naturally form a lower axial limit with the lower step of the swing fulcrum groove (preventing it from coming out of the lower end of the sleeve). Because the spherical section and the drive section are separate, the lower half of the pressure foot shaft can swing smoothly without being affected by the drive section, while the drive section can be driven to move linearly up and down by the pressure foot drive assembly without being affected by the lower half of the pressure foot shaft. Moreover, the diameter of the drive section is larger than that of the connecting section, which is beneficial for the tight clamping and fixing of the drive section and the upper end of the connecting sleeve. In addition, after the drive section is fixed to the upper end of the connecting sleeve, it will form a natural lower axial limit from the upper side of the spherical section. The rigid upper axial limit, combined with the other two, achieves bidirectional rigid axial positioning of the spherical part, completely locking the axial fixed position of the spherical part in the swing fulcrum groove. This ensures that the center of the spherical part always coincides with the mating center of the swing fulcrum groove, preventing axial movement of the pressure foot shaft during swinging. It also ensures the consistency of the trajectory of the pressure foot shaft swinging around the spherical center, allowing the spherical part and the swing fulcrum groove to always maintain a full-range, gapless spherical surface fit. This avoids local contact and excessive gaps on the spherical mating surface caused by axial movement, ensuring that the force on the pressure foot shaft is evenly distributed across the entire spherical surface during swinging, thus improving the smoothness and stability of the swing.

[0018] The first clamp fixes the upper end of the connecting sleeve to the lower end of the drive section, and cooperates with the clamping gap at the upper end of the connecting sleeve to make the towel presser foot shaft and the swing support assembly a linkage whole. This achieves rigid connection and synchronous up and down movement of the towel presser foot shaft and the swing support assembly, while retaining the degree of freedom of the presser foot shaft to swing around the spherical part. The linkage whole lifting and lowering ensures that the spherical part always maintains a precise spherical fit with the swing fulcrum groove of the connecting sleeve, and there will be no misalignment of the mating surface due to lifting and lowering, thus ensuring the effectiveness of the swing function.

[0019] The axial lower end of the engagement gap has an axial spacing distance with the swing fulcrum groove to avoid affecting the swing fulcrum groove and ensure the effectiveness of the swing joint between the swing fulcrum groove and the spherical part. In addition, the axial cross section of the swing fulcrum groove is arc-shaped, and its upper side is connected to the inner wall of the upper end of the connecting sleeve. The diameter of the lower side is smaller than the diameter of the spherical part, similar to a hemispherical groove. This design allows the upper side of the swing fulcrum groove to form an open and smooth transition entrance, which perfectly matches the assembly process of the spherical part and the connecting section integrated structure passing through the connecting sleeve from top to bottom. Moreover, the curvature of the swing fulcrum groove is precisely matched with the curvature of the spherical part. The hemispherical cavity structure can achieve all-round, surface-contact spherical fit with the spherical part. This is the core structural basis for ensuring smooth swing of the pressure foot shaft around a fixed point.

[0020] The spherical fit between the spherical part and the swing fulcrum groove provides a rigid foundation for the presser foot shaft's fixed-axis oscillation. However, relying solely on the spherical fulcrum can lead to hard-contact oscillation during presser foot shaft oscillation, especially during high-speed directional changes of the embroidery frame, where the presser foot shaft's oscillation response is prone to lag. The elastic support component undergoes adaptive elastic deformation synchronously with the presser foot shaft's oscillation (when the presser foot shaft oscillates to one side, the corresponding support component stretches, and the other side compresses). This does not restrict the presser foot shaft's oscillation freedom but provides flexible guidance and assistance through elastic force, making the presser foot shaft's oscillation smoother and less jammed. This significantly improves the presser foot's responsiveness to fabric movement, further reducing the pushing force during embroidery frame movement and ensuring the positioning accuracy of the embroidery. After the embroidery frame movement is complete, the presser foot shaft needs to return from the oscillation position to its initial vertical state, providing a precise initial position for the next embroidery action. The elastic support stores elastic potential energy when the presser foot shaft wobbles. When the embroidery frame stops moving and the pushing force disappears, the elastic potential energy is released, and the presser foot shaft is quickly and accurately reset through the elastic rebound force. At the same time, the elastic reset force is uniform and the trajectory is fixed, which can ensure that the presser foot shaft position is consistent after each reset.

[0021] The elastic support component uses a cylindrical spring, utilizing its linear elasticity, high axial load capacity, and fatigue resistance to precisely meet the elastic support requirements of the pressure foot shaft with its small angle and high frequency of sway. The cylindrical spring (elastic support component) is secured by a second and third clamp. The clamp has a circumferential clamping structure that perfectly matches the axisymmetric helical structure of the cylindrical spring, forming a full circumferential surface contact with the spring end after clamping. When the cylindrical spring fails due to fatigue and needs replacement, the old spring can be quickly removed and the new spring installed simply by loosening the clamp bolts.

[0022] 8. The swing support assembly is connected to the sliding sealing hole in a sliding seal, so the swing support assembly and the bottom of the towel embroidery machine housing are relatively sealed, preventing the machine oil inside the towel embroidery machine housing from leaking out from here and causing contamination of the embroidery.

[0023] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0024] The invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the towel embroidery machine head in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the towel embroidery machine head in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the towel presser foot shaft in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the swing support assembly in an embodiment of the present invention; Figure 5 This is an assembly structure diagram of the towel presser foot shaft and the swing support assembly in an embodiment of the present invention; Figure 6 This is an assembly structure diagram of the towel presser foot shaft and the swing support assembly in an embodiment of the present invention; Figure 7 This is an assembly structure diagram of the towel presser foot drive assembly and the towel presser foot shaft in an embodiment of the present invention; Reference numerals: 1. Towel presser foot shaft; 11. Towel presser foot; 111. Presser foot body; 112. Clamping part; 113. Lower cylindrical step part; 12. Connecting section; 13. Spherical part; 14. Drive section; 15. Presser foot shaft return spring; 2. Swing support assembly; 21. Connecting sleeve; 211. Swing fulcrum groove; 212. Upper cylindrical step part; 213. Clamping gap; 22. First clamp; 23. Second clamp; 24. Elastic support; 25. Third clamp; 3. Cam linkage mechanism; 3. Cam; 31. V-shaped connecting rod; 32. Small connecting rod; 33. Presser foot driver; 34. Towel embroidery machine head; 4. Sliding sealing sleeve; 41. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0026] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0027] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper" and "lower" used below, indicating orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0031] Towel embroidery machines include towel embroidery machine heads, such as... Figures 1 to 7As shown, the towel embroidery machine head 4 includes a machine housing and a towel embroidery presser foot device. The towel embroidery presser foot device includes a towel presser foot shaft 1 with a towel presser foot 11 at the bottom and a towel presser foot drive assembly for driving the towel presser foot shaft 1 to move up and down. The towel embroidery presser foot device also includes a swing support assembly 2 nested outside the towel presser foot shaft 1. The swing support assembly 2 has a swing fulcrum, and the towel presser foot shaft 1 has a swing node that movably engages with the swing fulcrum. That is, the swing node and the swing fulcrum are in a clearance rotational engagement and can rotate relative to the swing fulcrum, forming a swing joint between them. Due to the engagement of the swing node and the swing fulcrum, the towel presser foot shaft 1 can swing around the swing fulcrum when the towel presser foot is subjected to external force. Here, the swing of the towel presser foot shaft 1 does not mean a whole-body swing, but rather a swing from the swing node down to the towel presser foot. Furthermore, the axial positions of the towel presser foot shaft 1 and the swing support assembly 2 are fixed. While the towel presser foot drive assembly drives the towel presser foot shaft 1 to move up and down, the swing support assembly 2 moves up and down accordingly. When the embroidery frame of the towel machine moves, the towel presser foot shaft 1 and the swing support assembly 2 remain at the set upper and lower positions. The towel presser foot 11 is still pressing the fabric. Therefore, when the fabric moves together with the embroidery frame of the towel machine, it will generate a pushing force on the towel presser foot.

[0032] like Figure 5 As shown, the swing direction of the towel presser foot shaft 1 follows the movement direction of the towel machine embroidery frame. For example, if the towel machine embroidery frame moves along the X+ direction, the towel presser foot shaft swings along the X+ direction; if the towel machine embroidery frame moves along the X- direction, the towel presser foot shaft swings along the X- direction.

[0033] In this embodiment, a swing joint is formed between the swing node and the swing fulcrum. The swing support assembly limits the swing trajectory of the presser foot shaft through the swing fulcrum, so that the presser foot shaft can only swing flexibly around the fulcrum at a small angle. When the embroidery frame moves the fabric, the presser foot can swing synchronously around the fulcrum with the direction of fabric movement, so that the relative sliding between the presser foot and the fabric is transformed into a close-fitting follow-up, completely eliminating the pushing force caused by sliding, realizing the requirement of "presser foot presses the fabric but does not push the fabric", ensuring the positioning accuracy of the embroidery and avoiding the displacement of the embroidery.

[0034] Specifically, the swing support assembly 2 includes an axially penetrating connecting sleeve 21. The inner wall of the connecting sleeve 21 is provided with a swing fulcrum groove 211, serving as a swing fulcrum. The swing fulcrum groove 211 has an arc-shaped groove wall. The towel presser foot shaft 1 passes through the connecting sleeve 21 and has a spherical part 13 in the middle that mates with the swing fulcrum groove 211. According to the shape of the swing fulcrum groove described below, the swing fulcrum groove is similar to a hemisphere. Since the swing fulcrum groove has a partial spherical surface that matches the curvature of the spherical part, a spherical joint structure with a spherical fit is formed between the spherical part 13 and the swing fulcrum groove 211. Regardless of the direction in which the towel machine embroidery frame moves, the towel presser foot shaft 1 can swing accordingly. The spherical part precisely matches the spherical surface of the swing fulcrum groove, forming a unique and fixed spherical swing fulcrum. Furthermore, because the embroidery frame of the towel machine moves a relatively small distance (from the start of the embroidery frame to the towel presser foot lifting and detaching from the fabric during the second stitch), the towel presser foot shaft can only make a small-angle spherical deflection around this fulcrum, completely defining the swing trajectory and center of the presser foot shaft. When the embroidery frame moves the fabric, the presser foot synchronously deflects around the spherical fulcrum in the direction of fabric movement, transforming the rigid relative sliding between the presser foot and the fabric into a close-fitting, follow-up contact. Only the vertical pressing pressure is retained, completely eliminating the pushing force caused by horizontal sliding friction.

[0035] The towel presser foot shaft 1 includes a connecting section 12 connected to the towel presser foot 11 and a driving section 14 located above the connecting section 12. The diameter of the driving section 14 is larger than that of the connecting section 12. The spherical part 13 is integrally connected to the connecting section 12 and has a diameter larger than that of the connecting section 12. A radial gap is provided between the connecting section 12 and the connecting sleeve 21. That is, the spherical part 13 is integral with the connecting section 12, but the spherical part 13 and the driving section 14 are separately arranged. A certain gap can be set so that the driving section 14 does not affect the rotation of the spherical part 13. Therefore, it is also part of the swing node, allowing the part of the towel presser foot shaft below the driving section 14 to swing. Therefore, the spherical part 13 swings integrally with the connecting section 12 and is not affected or interfered with by the driving section 14. Since the spherical part 13 mates with the swing fulcrum groove 211, which is located on the inner wall of the upper end of the connecting sleeve 21, the lower end of the driving section 14, the spherical part, and the upper middle part of the connecting section are all located inside the connecting sleeve 21. The diameter of the connecting section is smaller than the inner diameter of the connecting sleeve 21, leaving a certain radial space for the swing of the connecting section 12. In this technical solution, the towel presser foot shaft is a three-section structure consisting of a driving section (large diameter), a spherical part, and a connecting section (small diameter). The diameter of the spherical part is larger than that of the connecting section, forming a uniform annular gap between the connecting section and the inner wall of the connecting sleeve. When the lower middle part of the presser foot shaft (the spherical part and the connecting section) swings, only the spherical part contacts the spherical surface of the swing fulcrum groove. The connecting section does not rub or get stuck against the inner wall of the sleeve. This gap provides sufficient space for the swing of the connecting section. Furthermore, due to the coaxiality advantage of the spherical part and the connecting section being integrated, the gap is evenly distributed circumferentially, eliminating the risk of interference caused by excessively small local gaps. The spherical part has a larger diameter than the connecting section. When both are inserted into the connecting sleeve from top to bottom, the lower side of the spherical part will form a natural lower axial limit with the lower step of the swing fulcrum groove, preventing it from coming out of the lower end of the sleeve. Because the spherical part and the drive section are separate, the lower half of the pressure foot shaft can swing smoothly without being affected by the drive section, while the drive section can be driven to move linearly up and down by the pressure foot drive assembly without being affected by the lower half of the pressure foot shaft. Furthermore, the diameter of the drive section is larger than that of the connecting section, which facilitates the clamping and fixing of the drive section and the upper end of the connecting sleeve. In addition, after the drive section is fixed to the upper end of the connecting sleeve, it will form a rigid upper axial limit from the upper side of the spherical part. The combination of the two achieves bidirectional rigid axial positioning of the spherical part, completely locking the axial fixed position of the spherical part in the swing fulcrum groove. This ensures that the center of the spherical part always coincides with the mating center of the swing fulcrum groove, preventing axial movement of the pressure foot shaft during the swing process. It also ensures the consistency of the trajectory of the pressure foot shaft swinging around the fixed axis of the spherical part, allowing the spherical part and the swing fulcrum groove to always maintain a full-range, gapless spherical surface fit. This avoids local contact and excessive gaps on the spherical mating surface caused by axial movement, ensuring that the force on the pressure foot shaft is evenly distributed across the entire spherical surface during the swing, thus improving the smoothness and stability of the swing.

[0036] Furthermore, the swing support assembly 2 also includes a first clamp 22, which is fixed to the upper end of the connecting sleeve 21, fixing the upper end of the connecting sleeve 21 to the lower end of the drive section 14. The upper end of the connecting sleeve 21 has at least one axially extending clamping gap 213 spaced circumferentially, facilitating the smooth insertion of the lower end of the drive section 14 into the upper end of the connecting sleeve 21, which is then secured by the first clamp. Simultaneously, the mating structure between the lower end face of the drive section, the spherical part 13, and the swing fulcrum groove 211 makes the segmented towel presser foot shaft and the swing support assembly a unified, interconnected whole. This achieves rigid connection and synchronous up-and-down movement between the towel presser foot shaft and the swing support assembly, while preserving the presser foot shaft's degree of freedom of sway around the spherical part. The integrated lifting mechanism ensures that the spherical part maintains a precise spherical fit with the swing fulcrum groove of the connecting sleeve, preventing misalignment of the mating surfaces during lifting and ensuring the effectiveness of the sway function. Figure 6 As shown, the lower end of the drive section 14 is a solid structure to avoid deformation, while the upper part of the lower end is a hollow structure.

[0037] Furthermore, there is a gap between the inner axial end of the engagement gap 213 and the swing fulcrum groove 211: to avoid affecting the swing fulcrum groove and to ensure the effectiveness of the swing joint between the swing fulcrum groove and the spherical part.

[0038] like Figure 6 As shown, the axial cross-section of the swing fulcrum groove 211 is arc-shaped, and its upper side is connected to the inner wall of the upper end of the connecting sleeve 21, while the diameter of its lower side is smaller than that of the spherical part. Similar to a hemispherical groove with a centrally open hole at the bottom, this design allows the upper side of the swing fulcrum groove to form an open and smooth transition entrance, perfectly matching the assembly process of the spherical part and the connecting section as an integral structure passing through the connecting sleeve from top to bottom. Moreover, the curvature of the swing fulcrum groove precisely matches the curvature of the spherical part, and the hemispherical cavity structure can achieve all-round, surface-contact spherical fit with the spherical part. This is the core structural basis for ensuring smooth swing of the pressure foot shaft around a fixed point.

[0039] It is understandable that the mating structure between the swing node and the swing fulcrum is not limited to the mating structure between the spherical part and the swing fulcrum groove mentioned above; for example, a conventional universal joint structure can also be used.

[0040] In some embodiments, the swing support assembly 2 further includes an elastic support 24, the lower end of which is connected to the towel presser foot 11 and the upper end to the connecting sleeve 21. The spherical part and the spherical fit of the swing fulcrum groove provide a rigid basis for the presser foot shaft to swing about a fixed axis. However, if only the spherical fulcrum is used, the presser foot shaft is prone to hard contact swing when it swings, especially when the embroidery frame moves at high speed and changes direction, the presser foot shaft swing response is prone to lag. The elastic support generates adaptive elastic deformation synchronously with the swing of the presser foot shaft (when the presser foot shaft swings to one side, the support on the corresponding side is stretched and the support on the other side is compressed). This does not restrict the swing freedom of the presser foot shaft, but can also provide flexible guidance and assistance for the swing through elastic force, making the swing of the presser foot shaft smoother and without jamming, greatly improving the timeliness of the presser foot's response to the fabric movement, further reducing the pushing force when the embroidery frame moves, and ensuring the positioning accuracy of the embroidery. After the embroidery frame has moved, the presser foot shaft needs to return to its initial vertical position from its swayed position to provide a precise initial position for the next embroidery movement. The elastic support stores elastic potential energy when the presser foot shaft sways. When the embroidery frame stops moving and the pushing force of the fabric disappears, the elastic potential energy is released, and the elastic rebound force drives the presser foot shaft to quickly and accurately return to its original position. At the same time, the elastic return force is uniform and the trajectory is fixed, which can ensure that the presser foot shaft position is consistent after each return.

[0041] Specifically, the swing support assembly 2 further includes a second clamp 23 and a third clamp 25. The second clamp 23 fixes the elastic support member 24 to the connecting sleeve 21, and the third clamp 25 fixes the elastic support member 24 to the towel presser foot 11. Here, the elastic support member is a cylindrical spring. The elastic support member uses a cylindrical spring, utilizing its linear elasticity, high axial load-bearing capacity, and fatigue resistance mechanical properties to precisely adapt to the elastic support requirements of the presser foot shaft with small angles and high frequency of sway. The cylindrical spring (elastic support member) is fixed by clamping with the second and third clamps. The clamps are annular circumferential clamping structures, which are fully compatible with the axisymmetric helical structure of the cylindrical spring. After clamping, they can form a full circumferential surface contact with the end of the spring. When the cylindrical spring fails due to fatigue and needs to be replaced, the old spring can be quickly disassembled and a new spring installed simply by loosening the clamp bolts.

[0042] The connecting sleeve 21 has an upper cylindrical step 212 at its bottom. The upper end of the cylindrical spring is sleeved on the upper cylindrical step 212 and is limited in fit with the end face of the step. The towel presser foot 11 has a presser foot body 111 and a clamping part 112. The presser foot body 111 is a ring-shaped piece with a center for embroidery needles to pass through. The bottom has a serrated structure for pressing the fabric. The clamping part 112 is tightly fixed to the lower end of the connecting section 12. The upper end of the clamping part is a lower cylindrical step 113. The lower end of the cylindrical spring is sleeved on the lower cylindrical step 113 and is limited in fit with the end face of the lower cylindrical step. When the presser foot body 111 presses on the fabric, the force it receives causes the connecting section to swing, and during the swing, the cylindrical spring twists.

[0043] In some embodiments, the bottom of the towel embroidery machine housing is provided with a vertically penetrating sliding sealing hole, and the swing support assembly 2 is slidably and sealingly connected to the sliding sealing hole. Specifically, the bottom of the towel embroidery machine housing is provided with a through hole, and a sliding sealing sleeve 41 is installed in the through hole. The sliding sealing hole is located in the sliding sealing sleeve 41, and the connecting sleeve 21 is slidably and sealingly connected to the sliding sealing hole, allowing it to slide up and down along the sliding sealing hole. In this way, when the towel presser foot shaft and the swing support assembly move up and down together, the frictional resistance is small. The sliding sealing hole also guides the towel presser foot shaft and the swing support assembly, and the swing support assembly is relatively sealed to the bottom of the towel embroidery machine housing, preventing the machine oil inside the towel embroidery machine housing from leaking out from here and causing contamination of the embroidery.

[0044] The structure of the towel presser foot drive assembly can be referenced from relevant technologies, such as... Figure 7 As shown, a common cam-linkage mechanism 3 can be used, including a cam 31 connected to the main shaft, a V-shaped link 32 connected to the cam, and a small link 33 connecting the V-shaped link 32 and the presser foot driver 34. The presser foot driver 34 is connected to the upper part of the drive section of the towel presser foot shaft 1, and the towel presser foot shaft 1 is provided with a presser foot shaft return spring 15.

[0045] This embodiment describes part of the structure of the towel embroidery machine; other structures not described herein can be referred to in the prior art.

[0046] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Those skilled in the art should understand that the invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the invention will be included within the scope of the claims.

Claims

1. A towel embroidery presser foot device, characterized in that, The device includes a towel presser foot shaft with a towel presser foot at the bottom, a towel presser foot drive assembly for driving the towel presser foot shaft to move up and down, and a swing support assembly with a swing fulcrum. The swing support assembly is connected to the towel presser foot shaft and moves up and down with the towel presser foot shaft. The towel presser foot shaft includes a connecting section connected to the towel presser foot. The connecting section is provided with a swing node that movably cooperates with the swing fulcrum, so that when the towel presser foot is subjected to external force, the connecting section swings around the swing fulcrum.

2. The towel embroidery presser foot device according to claim 1, characterized in that, The swing support assembly includes a connecting sleeve with a swing fulcrum groove on its inner wall, the towel presser foot shaft passes through the connecting sleeve, and the swing node includes a spherical part that mates with the swing fulcrum groove.

3. The towel embroidery presser foot device according to claim 2, characterized in that, The towel presser foot shaft also includes a drive section located above the connecting section. The drive section is connected to the towel presser foot drive assembly. The spherical part is integrally connected to the connecting section and has a diameter larger than that of the connecting section. The spherical part and the drive section are separately arranged. The diameter of the drive section is larger than that of the connecting section. A radial gap is provided between the connecting section and the connecting sleeve.

4. The towel embroidery presser foot device according to claim 3, characterized in that, The swing support assembly also includes a first clamp, which is fixed to the upper end of the connecting sleeve, fixing the upper end of the connecting sleeve to the lower end of the drive section, and the upper end of the connecting sleeve is provided with at least one axially extending clamping gap in the circumferential direction.

5. The towel embroidery presser foot device according to claim 4, characterized in that, The lower axial end of the engagement gap has an axial spacing distance with the swing fulcrum groove: and / or, the axial cross section of the swing fulcrum groove is arc-shaped, and the upper side is connected to the inner wall of the upper end of the connecting sleeve, and the diameter of the lower side is smaller than the diameter of the spherical part.

6. The towel embroidery presser foot device according to claim 2, characterized in that, The swing support assembly also includes an elastic support member, the lower end of which is connected to the towel presser foot and the upper end of which is connected to the connecting sleeve. The elastic support member provides elastic support to the towel presser foot shaft when the towel presser foot shaft swings.

7. The towel embroidery presser foot device according to claim 6, characterized in that, The swing support assembly further includes a second clamp and a third clamp, wherein the second clamp fixes the elastic support to the connecting sleeve, and the third clamp fixes the elastic support to the towel presser foot; and / or, the elastic support is a cylindrical spring.

8. The towel embroidery presser foot device according to claim 1, characterized in that, It also includes a towel embroidery machine housing, the bottom of which is provided with a sliding sealing hole that runs vertically through the bottom, and the swing support assembly is slidably and sealingly connected to the sliding sealing hole.

9. The towel embroidery presser foot device according to claim 8, characterized in that, The bottom of the towel embroidery machine housing is provided with a through hole, and a sliding sealing sleeve is installed in the through hole. The sliding sealing hole is located in the sliding sealing sleeve.

10. A towel embroidery machine, characterized in that, The device includes a towel embroidery machine head, wherein the towel embroidery machine head includes the towel embroidery presser foot device as described in any one of claims 1 to 9.

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