Sewing machine with rotatable machine head

Abstract

The utility model relates to a sewing machine with a rotatable machine head, which belongs to the technical field of sewing equipment, and comprises a cantilever, a connecting frame, a motor, a machine head, a threading structure and a restraining part for restraining a thread group, and the restraining part is arranged on the cantilever; the threading structure comprises an open hole formed in the cantilever and a threading pipe arranged on the machine head and used for threading, the open hole corresponds to the first center channel, the two ends of the threading pipe are the first end and the second end respectively, the first end of the threading pipe is matched with the open hole and used for guiding sewing threads to enter the machine head through the first center channel and the top of the machine head, and the second end of the threading pipe is matched with the second center channel. The second end of the threading pipe extends to the side face of the machine head and is used for leading out sewing threads from the side face of the machine head. According to the sewing machine, the turning radius of the machine head is smaller, the outer contour of the machine head is more regular, the rotational inertia can be effectively reduced, the sewing speed and safety can be improved, more stable pay-off can be achieved, and the better sewing effect can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, specifically to a sewing machine with a rotatable head. Background Technology

[0002] Sewing machines are commonly used sewing equipment. They typically use one or more sewing threads to create one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. Sewing machines can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products made of leather, plastic, and paper. The stitches produced are neat, beautiful, flat, and strong. They are fast, easy to use, and widely used in the sewing industry.

[0003] A sewing machine typically includes a sewing head, a rotary hook mechanism that works in conjunction with the sewing head, and a sewing platform for laying the fabric flat. The sewing head is the main part of the sewing machine and usually consists of four mechanisms: thread feeding, thread hooking, thread take-up, and thread feeding, as well as auxiliary mechanisms such as thread winding, thread pressing, and feed dog. The sewing head is usually located above the sewing platform, while the rotary hook mechanism is usually located below the sewing platform, corresponding to the position of the sewing head. The rotary hook mechanism works in conjunction with the sewing head to smoothly complete the sewing work.

[0004] A computerized sewing machine with a 360-degree rotating sewing head (also known as a 360-degree rotating perfect stitch sewing machine, computerized pattern template sewing machine, or template machine) is a common type of sewing machine. This machine typically includes a sewing platform, a cantilever mounted on the sewing platform, and a sewing head mounted on the cantilever. The sewing platform is equipped with a rotary hook mechanism adapted to the sewing head. In actual use, the sewing head can rotate arbitrarily under the control of a controller to meet the sewing needs of different stitches. Because the sewing head can rotate, the thread supply is usually located on the sewing head and rotates synchronously with it. For example, Chinese Patent CN213113818U discloses a sewing head and a sewing machine, and Chinese Patent CN2131138... 28U discloses a sewing machine head and sewing machine, etc., in which the thread set is embedded in one side of the machine head, which can reduce the moment of inertia. However, in practical applications, it has been found that: on the one hand, because the thread set is in an eccentric state, the rotation of the thread set during the thread feeding process is not stable during the rotation of the machine head, which is not conducive to smooth thread feeding and thus not conducive to achieving a higher sewing effect; on the other hand, the embedded thread set occupies more space in the machine head, which not only requires a larger size for the machine head, but also results in a relatively large turning radius and a large moment of inertia, which is not conducive to improving sewing speed. Moreover, the outer contour of the machine head is not regular, especially the thread set that is tilted on one side of the machine head, which poses a significant safety hazard during rotation and urgently needs to be solved. Utility Model Content

[0005] The first aspect of this utility model addresses the problem that existing sewing machine heads are not conducive to smooth thread feeding, and that the size and moment of inertia of the machine head are still relatively large, which is detrimental to improving sewing efficiency and safety. It provides a sewing machine with a smaller turning radius and a more regular outer contour of the machine head, which not only effectively reduces the moment of inertia, thus improving sewing speed and safety, but also allows for smoother thread feeding, leading to better sewing results. The main concept is as follows:

[0006] A sewing machine with a rotatable head includes a cantilever, a connecting frame, a motor, and a sewing head. The connecting frame is rotatably connected to the cantilever and has a first central channel. The sewing head is connected to the connecting frame, and the motor is driven by the connecting frame to drive the sewing head to rotate. The machine also includes a threading structure and a constraint component for constraining the thread assembly. The constraint component is located on the cantilever. The threading structure includes an opening on the cantilever and a threading tube on the sewing head for thread passage. The opening corresponds to the first central channel. The two ends of the threading tube are a first end and a second end, respectively. The first end of the threading tube cooperates with the opening to guide the sewing thread through the first central channel and the top of the sewing head into the sewing head. The second end of the threading tube extends to the side of the sewing head to draw the sewing thread out from the side of the sewing head. In this design, an opening is provided on the cantilever, corresponding to the first central channel, allowing the sewing thread to be introduced through this opening. Simultaneously, a thread guide tube is installed inside the machine head, enabling the sewing thread to enter the machine head via the first central channel and the top of the machine head, preventing the rotation of the machine head from affecting the thread transport. Guided by the thread guide tube, the sewing thread exits from the second end and is led out on the side of the machine head to cooperate with the thread clamp located on the side of the machine head. This design allows the constraint components for restraining the thread assembly to be located on the cantilever, rather than on the machine head. This not only significantly saves space in the machine head, allowing for a smaller machine head and effectively reducing rotational inertia, but also improves sewing speed. Furthermore, it makes the outer contour of the machine head more regular, effectively reducing safety hazards during operation. Furthermore, in this solution, since the constraint component used to constrain the thread group is not directly installed on the machine head, the constraint component will not rotate with the machine head during operation, allowing the thread group to be released smoothly, which is conducive to achieving better sewing results. At the same time, by configuring a thread guide tube to guide the sewing thread, on the one hand, it can ensure that the sewing thread is introduced into the thread clamp along a defined path, and on the other hand, it can effectively reduce friction, which helps to prevent the sewing thread from being worn or even broken, thus helping to protect the sewing thread.

[0007] Preferably, the first end of the thread-feeding tube extends at least to the upper part of the machine head, and the rotation center of the machine head passes through the first end of the thread-feeding tube. By extending the first end of the thread-feeding tube at least to the upper part of the machine head, the sewing thread is introduced from the top of the machine head in a top-to-bottom direction, which helps to prevent the rotation of the machine head from interfering with the feeding of the sewing thread. By making the rotation center of the machine head pass through the first end of the thread-feeding tube, the first end of the thread-feeding tube is as close as possible to the rotation center of the machine head. During the rotation of the machine head, the sewing thread between the opening and the machine head can be fed basically in a top-to-bottom direction and can be as close as possible to the rotation center of the machine head, effectively avoiding large swings of the sewing thread, thus facilitating a more stable feeding of the sewing thread.

[0008] Preferably, the first end of the thread-passing tube is coaxial with the rotation center of the sewing head. This helps to reduce the rotational inertia of the sewing head and effectively reduces the impact of the sewing head rotation on the thread feeding, effectively preventing large swings of the sewing thread and thus facilitating a more stable thread feeding.

[0009] To address the issue of smoother thread feeding, preferably, the opening is coaxial with the rotation center of the machine head; the first central channel is also coaxial with the rotation center of the machine head. In this solution, by making the opening and the first end of the thread-feeding tube coaxial with the rotation center of the machine head, the opening, the first end of the thread-feeding tube, and the rotation center of the machine head are all coaxial. This facilitates the vertical feeding of the sewing thread between the opening and the machine head in a top-to-bottom direction, effectively preventing large swings of the sewing thread caused by the rotation of the thread-feeding tube and the machine head, thus promoting smoother thread feeding.

[0010] Preferably, the threading tube includes a vertical section, the upper end of which is the first end of the threading tube. The vertical section is coaxial with the rotation center of the machine head, and the upper end of the vertical section is located below the opening. Alternatively, the upper end of the vertical section extends into a cantilever through the opening. This not only facilitates a better fit between the first end of the threading tube and the opening, allowing for better guidance of the sewing thread through the first central channel and the top of the machine head into the machine head, but also provides better isolation and protection for the sewing thread, preventing it from being worn.

[0011] The second aspect of this invention addresses the problem of reducing the size and rotational inertia of the sewing head while improving sewing efficiency and safety when a rotary electric joint is configured. Further, it includes a rotary electric joint located in a first central channel. The rotary electric joint comprises a rotating part and a stationary part. The rotating part is rotatably connected to the stationary part, and the rotating part has a second central channel extending through its upper and lower ends. The rotational center of the sewing head passes through the second central channel. The rotating part is fixedly connected to a connecting frame, and the stationary part is fixedly connected to a cantilever. The opening corresponds to the second central channel, and the first end of the thread tube is adapted to the second central channel. The second central channel is used for the sewing thread to pass through the rotary electric joint. In this solution, by configuring a rotary electric joint, not only can stable power supply and signal transmission be achieved during the rotation of the machine head relative to the cantilever, avoiding wire tangling, but the sewing thread can also pass through the rotary electric joint via the second central channel and smoothly exit from the second end of the thread tube, effectively isolating the sewing thread from the rotary electric joint so that they do not interfere with each other. This allows the constraint components of the constraint thread assembly to be placed on the cantilever instead of the machine head, which not only saves a lot of space in the machine head, making it smaller and thus effectively reducing the moment of inertia and improving sewing speed, but also makes the outer contour of the machine head more regular, effectively reducing safety hazards during operation.

[0012] Preferably, the first end of the thread-passing tube is coaxial with the rotation center of the sewing head, and the second central channel is also coaxial with the rotation center of the sewing head. This not only helps to reduce the rotational inertia of the sewing head, but also effectively reduces the impact of the sewing head rotation on the thread feeding, effectively preventing large swings of the sewing thread, thus facilitating a more stable thread feeding.

[0013] In some preferred embodiments, the threading tube includes a vertical section, the upper end of which is the first end of the threading tube. The vertical section passes through the second central channel, and the first end of the threading tube is positioned above the rotary electrical joint. This not only facilitates a better fit between the first end of the threading tube and the opening, allowing for better guidance of the sewing thread through the second central channel and the top of the machine head into the machine head, but also provides better isolation and protection for the sewing thread, preventing it from being worn.

[0014] Furthermore, the first end of the thread tube extends into a cantilever through the opening. This allows it to directly engage with the restraint component, preventing the sewing thread from contacting the opening and thus reducing friction points on the thread, which in turn helps protect it.

[0015] In some preferred embodiments, a vertical tube is also included, which is fixed to the second central channel. The first end of the threading tube is connected to the lower end of the vertical tube, and the upper end of the vertical tube extends above the rotary electric joint. The vertical tube facilitates assembly, and the machine head, threading tube, vertical tube, and rotating part can rotate synchronously. This not only allows for better alignment with the opening and better guides the sewing thread through the second central channel and the top of the machine head into the machine head, but also better isolates and protects the sewing thread, preventing wear and tear, and effectively preventing thread swaying, thus facilitating smoother thread feeding.

[0016] Furthermore, the upper end of the vertical tube extends into a cantilever via an opening. This allows it to directly engage with the restraint components, preventing the sewing thread from contacting the opening and thus reducing friction points on the thread, which in turn helps protect it.

[0017] To facilitate thread tensioning, preferably, the side of the machine head has a mounting surface with an opening. The second end of the thread guide tube extends into the opening, and a thread clamp is installed within the mounting surface. In this design, by providing a mounting surface on the side of the machine head for installing the thread clamp, and by constructing the opening on the mounting surface so that the second end of the thread guide tube cooperates with the thread clamp, the sewing thread can be more efficiently guided through the thread guide tube into the thread clamp, allowing the thread clamp to tension the sewing thread.

[0018] Preferably, the opening is constructed at the top of the cantilever, and the restraining component is disposed at the top of the cantilever and located on one side of the opening. This not only facilitates the guiding fit between the restraining component and the opening, but also contributes to a more rational cable supply path and less wear.

[0019] Furthermore, it also includes a thread holder, which is mounted on the cantilever and located on one side of the constraint component. The thread holder is equipped with thread holes or guide rings for guiding the sewing thread. By configuring the thread holder, the thread holes or guide rings can guide the sewing thread along a specific path, ensuring that the sewing thread maintains the correct position and direction during transmission, preventing it from deviating from the track and rubbing or interfering with other components, thus ensuring the smooth progress of the sewing process.

[0020] Furthermore, the outer diameter of the sewing head gradually decreases from the upper to the lower part. This effectively reduces the size and rotational inertia of the sewing head, while also providing more operating space for the sewing process and preventing the lower end of the frame or shell from interfering with the sewing process.

[0021] Furthermore, it also includes a sewing platform, a lower sewing head mounted on the sewing platform and adapted to the sewing head, the cantilever fixed to the sewing platform, and the sewing head located above the lower sewing head. During the sewing process, the sewing head can rotate freely within a 360-degree range to achieve perfect stitches.

[0022] Preferably, the connecting frame includes an outer sleeve and a flange connected to the outer sleeve, with the first central channel formed inside the outer sleeve; the machine head includes a frame for bearing and a housing connected to the outside of the frame, with the frame detachably connected to the flange.

[0023] Compared with the prior art, the sewing machine with a rotatable head provided by this utility model has a smaller turning radius and a more regular outer contour of the head, which not only effectively reduces the moment of inertia, which is conducive to improving sewing speed and safety, but also allows for more stable thread feeding, which is conducive to achieving better sewing results. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a structural schematic diagram of a sewing machine provided in Embodiment 1 of this utility model.

[0026] Figure 2 This is a partial structural diagram of the sewing machine head provided in Embodiment 1 of this utility model.

[0027] Figure 3 for Figure 2 Top view.

[0028] Figure 4 for Figure 3 Sectional view at point AA.

[0029] Figure 5 for Figure 4 A magnified view of a portion of point I in the middle.

[0030] Figure 6 This is a partial cross-sectional view of the connecting frame in a sewing machine provided in Embodiment 1 of this utility model.

[0031] Figure 7 This is a partial cross-sectional view of the connecting frame in another sewing machine provided in Embodiment 1 of this utility model.

[0032] Figure 8 This is a partial cross-sectional view of the connecting frame in the first type of sewing machine provided in Embodiment 2 of this utility model.

[0033] Figure 9 This is a partial cross-sectional view of the connecting frame in the second type of sewing machine provided in Embodiment 2 of this utility model.

[0034] Figure 10 This is a partial cross-sectional view of the connecting frame in the third type of sewing machine provided in Embodiment 2 of this utility model.

[0035] Figure 11 This is a partial cross-sectional view of the connecting frame in the fourth type of sewing machine provided in Embodiment 2 of this utility model.

[0036] The markings in the diagram are as follows: 1. Machine head; 11. Frame; 12. Housing; 13. Mounting plane; 14. Opening; 15. Bearing; 2. Cantilever; 21. Hole; 22. Constraint component; 23. Wire clamp; 24. Wire frame; 241. Wire guide ring; 25. Base plate; 26. Top plate; 3. Connecting frame; 31. Outer sleeve; 32. First central channel; 33. Flange; 4. Motor; 41. Drive gear; 42. Driven gear; 43. Synchronous belt; 5. Threading tube; 51. Vertical section; 52. First end; 53. Second end; 54. Arc transition; 6. Vertical tube; 7. Platform; 71. Support; 72. Lower machine head; 8. Rotary electrical joint; 81. Rotating part; 82. Second central channel; 83. Stationary part; 9. Sewing thread. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] like Figures 1-4 As shown, this embodiment provides a sewing machine with a rotatable head 1, including a sewing platform 7, a cantilever 2, a connecting frame 3, a motor 4 for driving the head 1 to rotate, and a lower sewing head 72 disposed on the sewing platform 7 and adapted to the head 1, etc. The sewing platform 7 typically includes a support 71 and a platform 7, such as... Figure 1 As shown, one end of the cantilever 2 is fixed to the sewing platform 7, which is usually a bracket 71 fixedly connected to the sewing platform 7.

[0040] like Figures 1-4As shown, the connecting frame 3 is rotatably connected to the cantilever 2, and the motor 4 is connected to the connecting frame 3 for transmission, so that the connecting frame 3 can be driven to rotate by the motor 4. At the same time, the sewing head 1 is connected to the connecting frame 3 and is located directly above the lower sewing head 72. In actual use, the sewing head 1 and the lower sewing head 72 can be used for sewing. The motor 4 can drive the sewing head 1 to rotate at the required angle, such as 90 degrees, 180 degrees, 360 degrees or more than 360 degrees, so that the sewing head 1 can rotate arbitrarily as needed during the sewing process, thereby achieving perfect stitches.

[0041] In implementation, the connecting frame 3 can be connected to the cantilever 2 via the bearing 15, such as... Figure 4 As shown, this allows the connecting frame 3 to have a degree of freedom of rotation relative to the cantilever 2. In implementation, the connecting frame 3 is constructed with a first central channel 32 for arranging electrical wiring. As an example, in this embodiment, the connecting frame 3 includes an outer sleeve 31 and a flange 33 connected to the outer sleeve 31, with the first central channel 32 formed within the outer sleeve 31, such as... Figure 4 As shown, the machine head 1 includes a frame 11 for support and a housing 12 connected to the outside of the frame 11. The upper end of the frame 11 is detachably connected to the flange 33 by fasteners such as bolts or screws. Figure 4 As shown, this allows the connecting frame 3 and the machine head 1 to be connected as a single unit and operate synchronously. In practice, the center of the first central channel 32 can be coaxial with both the rotation center of the connecting frame 3 and the rotation center of the machine head 1.

[0042] In implementation, the motor 4 and the connecting frame 3 can be connected by a transmission mechanism. This transmission mechanism can be a belt drive mechanism, a gear drive mechanism, etc. For example, the transmission mechanism used is a synchronous belt 43 transmission mechanism. The synchronous belt 43 transmission mechanism includes a driving gear 41, a synchronous belt 43, and a driven gear 42 constructed on the outer side of the outer sleeve 31. Figure 4 As shown, the synchronous belt 43 is tensioned between the driving gear 41 and the driven gear 42. The motor 4 is connected to the driving gear 41, allowing the motor 4 to drive the connecting frame 3 to rotate via the synchronous belt 43 transmission mechanism. In implementation, the motor 4 can preferably be a stepper motor 4 or a servo motor 4.

[0043] It is understood that, in order to achieve the sewing function, in this embodiment, the frame 11 of the machine head 1 is also provided with a needle bar mechanism, a needle bar drive mechanism, a presser foot, a presser foot drive mechanism, and a thread supply mechanism. The needle bar mechanism includes a needle bar, the lower end of which is equipped with a machine needle. The needle bar drive mechanism is connected to the needle bar drive mechanism to drive the machine needle to perform up and down piercing actions to achieve the sewing function. The presser foot drive mechanism is connected to the presser foot drive mechanism to transmit power to the presser foot so that it can be raised or lowered as needed. The presser foot is used to press down the fabric during the sewing process to prevent the fabric from moving and to ensure the neatness of the sewing thread.

[0044] In this embodiment, the thread supply mechanism is used to provide the sewing thread 9 required for the sewing process. In implementation, the thread supply mechanism includes a constraint component 22 for constraining the thread assembly and a threading structure, wherein, as... Figures 1-5 As shown, the top of the cantilever 2 is provided with an opening 21 for the sewing thread 9 to pass through. The opening 21 is preferably a round hole, and it is located above the machine head 1. In practice, the opening 21 can preferably be positioned directly above the machine head 1, as shown below. Figure 4 and Figure 5 As shown, the opening 21 corresponds to the first central channel 32. In implementation, the opening 21 can preferably be coaxial with the first central channel 32 and the rotation center of the machine head 1. Of course, some errors may exist in actual production and assembly. Therefore, in actual implementation, it is sufficient to ensure that the rotation center of the machine head 1 can pass through the opening 21, that is, the opening 21 is allowed to be appropriately offset from the rotation center of the machine head 1. Of course, in other embodiments, the opening 21 can also be located at a position further away from the rotation center of the machine head 1, which will not be illustrated here.

[0045] In implementation, the constraint member 22 can be disposed on the cantilever 2 and located on one side of the opening 21. However, in the preferred embodiment provided in this example, the constraint member 22 can preferably be disposed at the top of the cantilever 2, such as... Figures 1-3 As shown, this allows the constraint member 22 to form a guiding fit with the opening 21. In implementation, the constraint member 22 can be an existing constraint member 22, such as... Figures 1-3 As shown, the constraint component 22 can be installed vertically and detachably connected to the cantilever 2 for easy installation and replacement. During actual sewing, the thread set is fitted onto the constraint component 22, and the thread set can rotate relative to the constraint component 22 under the action of traction force, thereby achieving the purpose of automatically releasing the sewing thread 9.

[0046] In implementation, the threading structure includes a threading tube 5 located at the machine head 1 for threading, such as... Figures 1-4 As shown, the sewing thread 9 is led to the needle bar of the sewing machine via the thread tube 5. For ease of description, the two ends of the thread tube 5 are a first end 52 and a second end 53, respectively. The first end 52 of the thread tube 5 extends at least to the upper part of the machine head 1 (in this embodiment, the machine head 1 can be divided into three equal parts along its height direction, namely the upper part, middle part, and lower part from top to bottom; this will not be elaborated further). Figure 4 , Figure 6 or Figure 7 As shown, the first end 52 of the thread tube 5 faces the upper first central channel 32 and corresponds to the upper opening 21, so as to introduce the sewing thread 9 from above and downward; at the same time, in this embodiment, the side of the machine head 1 is also constructed with an opening 14, such as Figures 1-4As shown, the shape and size of the opening 14 are adapted to the thread tube 5, and the second end 53 of the thread tube 5 extends to the opening 14 so as to lead out the sewing thread 9 from the opening 14 on the side of the machine head 1, thereby achieving the purpose of leading out the sewing thread 9 from the side of the machine head 1.

[0047] In implementation, the opening 14 can be constructed on the frame 11 or the outer shell 12 of the head 1. In this embodiment, a mounting surface 13 is provided on one side of the head 1, and the opening 14 can preferably be constructed on this mounting surface 13, such as... Figure 1 and Figure 2 As shown, one or two thread clamps 23 are provided within the mounting plane 13. In this embodiment, by providing the mounting plane 13 on one side of the machine head 1, it is very convenient to position and install the thread clamps 23. By constructing the opening 14 on the mounting plane 13, the second end 53 of the thread tube 5 can cooperate with the thread clamp 23, so that the sewing thread 9 can be introduced into the thread clamp 23 through the thread tube 5 in a more reasonable manner, so that the thread clamp 23 can be used to tension the sewing thread 9 and guide the sewing thread 9 to the needle bar.

[0048] In implementation, the outer shell 12 of the machine head 1 can be a rotating body structure as a whole, so as to effectively reduce the size and moment of inertia of the machine head 1. Meanwhile, as... Figure 1 and Figure 4 As shown, one side of the outer casing 12 is recessed inward to form the mounting plane 13, ensuring that the wire clamp 23 does not protrude or protrude too much from the side of the head 1, thus improving safety. In a further embodiment, the outer diameter of the head 1 can gradually decrease from the upper to the lower part, such as... Figures 1-4 As shown, this design can effectively reduce the size and rotational inertia of the sewing head 1, and provide more operating space for the sewing process, preventing the lower end of the frame 11 or the lower end of the outer shell 12 from interfering with the sewing process.

[0049] In implementation, the cross-section of the internal channel of the thread tube 5 can preferably be constructed as a circle to effectively protect the sewing thread 9. The thread tube 5 can preferably be set inside the outer casing 12, and the thread tube 5 can be fixed to the frame 11 by adhesive or by fasteners such as clamps, so that the thread tube 5 and the sewing head 1 rotate synchronously during the sewing process, which can prevent the thread tube 5 from shaking and falling off, and also make the outer contour of the sewing head 1 more regular.

[0050] In practice, the center of the first end 52 of the conduit 5 should preferably coincide with the rotation center of the machine head 1. However, some errors may exist in actual production and assembly. Therefore, in actual implementation, it is sufficient to ensure that the rotation center of the machine head 1 passes through the first end 52 of the conduit 5. At this time, the first end 52 of the conduit 5 is located at the position of the rotation center of the machine head 1, and the center of the first end 52 of the conduit 5 is coaxial (i.e. coincident) with the rotation center of the machine head 1 or slightly offset from the rotation center of the machine head 1. The first end 52 of the conduit 5 can be directly aligned with the upper opening 21, such as... Figure 4 , Figure 6 and Figure 7 As shown, during the rotation of the machine head 1, the sewing thread 9 between the opening 21 and the machine head 1 can be conveyed basically in the direction from top to bottom, and can be as close as possible to the rotation center of the connecting frame 3 and the machine head 1, effectively avoiding large swings of the sewing thread 9, thus facilitating a more stable conveying of the sewing thread 9.

[0051] To better guide the sewing thread 9, during implementation, the thread guide tube 5 includes a vertical section 51, such as... Figure 4 , Figure 6 and Figure 7 As shown, the upper end of the vertical section 51 is the first end 52 of the conduit 5. The vertical section 51 is coaxial with the rotation center of the machine head 1, as shown. Figure 4 , Figure 6 and Figure 7 As shown. In one embodiment, the upper end of the vertical section 51 can be located below the opening 21, so that during the sewing process, the sewing thread 9 will not be worn at the first end 52 of the thread tube 5, which helps to protect the sewing thread 9. For example, the upper end of the vertical section 51 can only extend to the top of the machine head 1, such as... Figure 6 As shown, at this time, the sewing thread 9 entering from the upper opening passes through the upper end of the vertical section 51 and enters the thread tube 5. Alternatively, the upper end of the vertical section 51 can extend through the first central channel 32 to a position near the opening 21 and below the opening 21, as shown. Figure 7 As shown, at this time, the sewing thread 9 entering from the upper opening passes through the upper end of the vertical section 51 into the thread tube 5, which allows for better isolation and protection of the sewing thread 9. To effectively protect the sewing thread 9 and prevent it from being worn, in another preferred embodiment, the upper end of the vertical section 51 can extend a cantilever 2 through the opening 21, allowing the sewing thread 9 to directly enter the thread tube 5 through the upper end of the vertical section 51, as shown. Figure 4 and Figure 5 As shown, at this time, the inner diameter of the opening 21 is larger than the outer diameter of the vertical section 51, and the opening does not directly contact the vertical section 51, so that the sewing thread 9 does not contact the opening, thereby reducing the friction points of the sewing thread 9 and thus helping to protect the sewing thread 9. Of course, in a further embodiment, the inner side of the first end 52 of the thread tube 5 is constructed with an arc-shaped transition 54, such as... Figure 5As shown, this can effectively reduce the wear of sewing thread 9.

[0052] To change the direction of the sewing thread 9, during implementation, several bends are included between the first end 52 and the second end 53 of the thread tube 5, such as... Figure 2 or Figure 4 As shown, this is to allow for a smoother, lower-friction change in the direction of the sewing thread 9 by utilizing the bend. In practice, the thread guide 5 can be a single tube or a combination of multiple tubes.

[0053] In a more refined embodiment, the cable supply mechanism further includes a cable tray 24, such as... Figure 1 or Figure 3 As shown, the wire frame 24 is mounted on the cantilever 2 and located on one side of the constraint member 22. In practice, the wire frame 24 can preferably be mounted on the top of the cantilever 2, such as... Figure 1 or Figure 3 As shown, this facilitates cooperation with the constraint component 22. Additionally, the wire frame 24 is also equipped with a wire hole or wire loop 241, such as... Figure 1 or Figure 3 As shown, the sewing thread 9 can be guided along a specific path using the thread hole or the guide ring 241, ensuring that the sewing thread 9 maintains the correct position and direction during transmission, preventing it from deviating from the track and rubbing or interfering with other components, thus ensuring the smooth progress of the sewing process.

[0054] In this embodiment, the lower sewing head 72 can be implemented using existing technology. To cooperate with the sewing head 1, the lower sewing head 72 typically includes a drive mechanism, a rotary hook mechanism, and a thread cutting mechanism for driving the lower sewing head 72 to rotate, etc., which will not be described in detail here. Similarly, in implementation, other structures of the sewing machine provided in this embodiment can be the same as those in the prior art, and will not be described in detail here.

[0055] In the sewing machine provided in this embodiment, the constraint component 22 for constraining the thread group is disposed on the cantilever 2, such as... Figure 1 and Figure 3 As shown, since it is not required to be installed on the sewing head 1, it not only saves a lot of space on the sewing head 1, allowing it to be made smaller, thus effectively reducing the moment of inertia and improving sewing speed, but also makes the outer contour of the sewing head 1 more regular, effectively reducing safety hazards during operation. Furthermore, in this embodiment, since the constraint component 22 for constraining the thread group does not need to be directly installed on the sewing head 1, the constraint component 22 will not rotate with the sewing head 1 during operation, allowing the thread group to be released smoothly, which is beneficial for achieving better sewing results. At the same time, by configuring the thread guide tube 5 to guide the sewing thread 9, on the one hand, it ensures that the sewing thread 9 is introduced into the thread clamp 23 along a defined path; on the other hand, it effectively reduces friction, which helps prevent the sewing thread 9 from being worn or even broken, thus protecting the sewing thread 9.

[0056] Example 2

[0057] To address the issues of reducing the size and rotational inertia of the sewing head 1 equipped with a rotary electrical joint 8 (or conductive slip ring), and improving sewing efficiency and safety, the main difference between this embodiment 2 and the aforementioned embodiment 1 is that the sewing machine provided in this embodiment further includes a rotary electrical joint 8 disposed in the first central channel 32. The rotary electrical joint 8 is mainly used to achieve stable power supply and signal transmission during the rotation of the sewing head 1 relative to the cantilever 2, avoiding wire entanglement. In implementation, the rotary electrical joint 8 can be a rotary electrical joint 8 with a central channel commonly used in the prior art. As an example, the rotary electrical joint 8 includes a rotating part 81 and a stationary part 83, such as... Figures 8-11 As shown, the rotating part 81 is rotatably connected to the stationary part 83, and the rotating part 81 is constructed with a second central channel 82 extending through both its upper and lower ends, as shown. Figures 8-11 As shown, the rotation center of the machine head 1 passes through the second central channel 82, that is, in implementation, the rotation center of the machine head 1 can be coaxial with the second central channel 82 (e.g., Figures 8-11 (As shown) or the rotation center of the machine head 1 can be slightly offset from the center of the second center channel 82.

[0058] In implementation, the rotating part 81 is fixedly connected to the connecting frame 3. For example, the rotating part 81 can be fixed to a base plate 25, such as... Figures 8-11 As shown, the base plate 25 is fixed to the connecting frame 3, thereby achieving a fixed connection between the rotating part 81 and the connecting frame 3, allowing the rotating part 81 and the connecting frame 3 to rotate synchronously. Simultaneously, the stationary part 83 is fixedly connected to the cantilever 2; for example, the stationary part 83 can be fixed to a top plate 26, such as... Figures 8-11 As shown, the top plate 26 is fixed to the cantilever 2, thereby achieving a fixed connection between the stationary part 83 and the cantilever 2, so that the stationary part 83 and the cantilever 2 can remain stationary during the sewing process.

[0059] like Figures 8-11 As shown, the opening 21 corresponds to the second central channel 82, and the first end 52 of the thread tube 5 corresponds to the second central channel 82; the sewing thread 9 passes through the rotating electrical joint 8 via the second central channel 82. In one embodiment, the thread tube 5 includes a vertical section 51, the upper end of which is the first end 52 of the thread tube 5. The first end 52 of the thread tube 5 can extend below the rotating part 81 and corresponds to the second central channel 82, as shown. Figure 8As shown, at this time, the inner diameter of the thread tube 5 can be the same as the inner diameter of the second central channel 82. In use, the sewing thread 9 enters the second central channel 82 through the opening 21 and then enters the first end 52 of the thread tube 5 through the second central channel 82. In another preferred embodiment, the outer diameter of the vertical section 51 can be less than or equal to the inner diameter of the second central channel 82. The vertical section 51 passes through the rotary electric joint 8 through the second central channel 82. The first end 52 of the thread tube 5 can be located below the opening 21, or it can extend from the opening 21 to form a cantilever 2, such as... Figure 9 As shown, this allows for direct guiding engagement with the constraint component 22.

[0060] For ease of assembly, in another preferred embodiment, the wiring structure further includes a vertical tube 6, the outer diameter of which is less than or equal to the inner diameter of the second central channel 82, allowing the vertical tube 6 to pass through the rotary electrical joint 8 via the second central channel 82. The vertical tube 6 can be fixed to the rotating part 81 with adhesive. Figure 10 and Figure 11 As shown, the vertical tube 6 can rotate synchronously with the rotating part 81. The first end 52 of the threading tube 5 is connected to the lower end of the vertical tube 6, so that the machine head 1, the threading tube 5, the vertical tube 6, and the rotating part 81 can rotate synchronously. At this time, the upper end of the vertical tube 6 can extend to a position close to the opening 21, as shown. Figure 10 As shown, the cantilever 2 can also extend through the opening 21, such as... Figure 11 As shown, this allows for direct guiding engagement with the constraint component 22. In a further embodiment, the inner side of the upper end of the vertical tube 6 is constructed with an arc-shaped transition 54, which can effectively reduce wear on the sewing thread 9.

[0061] It is understood that in the assembly type, the wires (including power supply lines and signal lines, etc.) on the cantilever 2 are connected to the stationary part 83, and the wires (including power supply lines and signal lines, etc.) on the head 1 are connected to the rotating part 81. In the rotary electrical joint 8, the rotating part 81 and the stationary part 83 are electrically connected through conductive materials (such as metal rings and brushes). When the rotating part 81 rotates relative to the stationary part 83, the conductive materials maintain sliding contact, so that the rotating part 81 and the stationary part 83 always maintain an electrical connection.

[0062] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A sewing machine with a rotatable head, comprising a cantilever, a connecting frame, a motor, and a sewing head, wherein the connecting frame is rotatably connected to the cantilever, the connecting frame having a first central channel, the sewing head being connected to the connecting frame, and the motor being driven by the connecting frame to drive the sewing head to rotate, characterized in that... It also includes a threading structure and a constraint component for constraining the wire group, the constraint component being disposed on the cantilever; The threading structure includes an opening on the cantilever and a threading tube on the machine head for threading. The opening corresponds to a first central channel. The two ends of the threading tube are a first end and a second end, respectively. The first end of the threading tube cooperates with the opening to guide the sewing thread through the first central channel and the top of the machine head into the machine head. The second end of the threading tube extends to the side of the machine head to lead out the sewing thread from the side of the machine head.

2. The rotary head sewing machine according to claim 1, wherein The first end of the conduit extends at least to the upper part of the machine head, and the rotation center of the machine head passes through the first end of the conduit.

3. The sewing machine with a rotatable head according to claim 2, characterized in that, The first end of the conduit is coaxial with the rotation center of the machine head.

4. The rotary head sewing machine according to claim 3, wherein, The opening is coaxial with the rotation center of the machine head; the first central channel is coaxial with the rotation center of the machine head; And / or, the conduit includes a vertical section, the upper end of which is the first end of the conduit, the vertical section is coaxial with the rotation center of the machine head, the upper end of the vertical section is located below the opening, or, the upper end of the vertical section extends into a cantilever through the opening.

5. The rotary head sewing machine according to claim 1, wherein, It also includes a rotary electrical joint disposed in the first central channel. The rotary electrical joint includes a rotating part and a stationary part. The rotating part is rotatably connected to the stationary part, and the rotating part is constructed with a second central channel passing through both the upper and lower ends. The rotation center of the machine head passes through the second central channel. The rotating part is fixedly connected to the connecting frame, and the stationary part is fixedly connected to the cantilever. The opening corresponds to the second central channel, and the first end of the thread tube is adapted to the second central channel. The second central channel is used for the sewing thread to pass through the rotary electrical joint.

6. The rotary head sewing machine according to claim 5, wherein, The first end of the conduit is coaxial with the rotation center of the machine head, and the second central channel is coaxial with the rotation center of the machine head.

7. The rotary head sewing machine of claim 5, wherein, The conduit includes a vertical section, the upper end of which is the first end of the conduit. The vertical section passes through the second central channel and positions the first end of the conduit above the rotary electrical joint. Alternatively, it may also include a vertical tube fixed to the second central channel, with the first end of the conduit connected to the lower end of the vertical tube, and the upper end of the vertical tube extending above the rotary electrical joint.

8. The rotary head sewing machine according to claim 7, wherein The first end of the conduit extends into a cantilever through an opening, or the upper end of the vertical conduit extends into a cantilever through an opening.

9. The rotary head sewing machine according to any one of claims 1 to 8, wherein The side of the machine head is provided with a mounting surface, the mounting surface has an opening, the second end of the conduit extends to the opening, and a wire clamp is provided in the mounting surface.

10. The rotary head sewing machine according to any one of claims 1 to 8, wherein Along the direction from the upper part to the lower part of the machine head, the outer diameter of the machine head gradually decreases; And / or, the opening is constructed at the top of the cantilever, and the restraint member is disposed at the top of the cantilever and located on one side of the opening; And / or, also includes a thread holder, which is disposed on the cantilever and located on one side of the constraint member, and the thread holder is provided with a thread hole or guide ring for guiding the sewing thread; And / or, it also includes a sewing platform, a lower sewing head disposed on the sewing platform and adapted to the sewing head, the cantilever being fixed to the sewing platform, and the sewing head being located above the lower sewing head.

Images