Machine head of sewing machine

Abstract

The machine head of the sewing machine comprises a machine shell, a needle rod, a middle presser foot rod, a middle presser foot and a lifting driving module, the middle presser foot rod is restrained on the machine shell in a lifting mode, and the lifting driving module is in transmission connection with the middle presser foot rod and used for driving the middle presser foot rod to ascend and descend. The device further comprises a direction adjusting module, the direction adjusting module comprises a connecting assembly, a rotating component and a rotating power and transmission component, the connecting assembly is connected to the middle presser foot rod, the rotating component is rotatably connected to the connecting assembly, the middle presser foot is connected to the rotating component, and the transmission component is rotatably arranged on the machine shell. The transmission part is provided with a guide rod parallel to the middle presser foot rod, the rotating part is provided with a matching opening matched with the guide rod, and the guide rod penetrates through the matching opening; the rotating power is in transmission connection with the transmission part and used for driving the transmission part to rotate, and the transmission part drives the rotating part to rotate through matching of the guide rod and the matching opening; according to the machine head, the middle presser foot can rotate, and the direction of the middle presser foot can be better matched with the sewing direction.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a head of a sewing machine. Background Art

[0002] A sewing machine is a mechanical device used for sewing or decorating textiles, etc., and an existing sewing machine generally includes a frame, an upper part, and a lower part adapted to the upper part, wherein the lower part generally includes a rotary shuttle mechanism (or a rotary shuttle body), and the upper part generally includes a head (or a sewing machine head), wherein the head includes a housing, a needle bar, a needle arranged at the lower end of the needle bar, a puncture drive module, a rotation drive module, a middle presser foot bar, and a middle presser foot connected to the middle presser foot bar, etc., wherein the puncture drive module and the needle bar rotation drive module are generally arranged in the housing, and the needle bar is arranged at a position corresponding to the rotary shuttle mechanism (or a rotary shuttle body), so that the needle can cooperate with the rotary shuttle mechanism. The puncture drive module is connected to the needle bar in a transmission manner, and is used to drive the needle bar to perform an up-and-down puncture action, and at the same time, the rotation drive module is also connected to the needle bar in a transmission manner to drive the needle bar to rotate, so that the needle of the sewing machine can not only perform an up-and-down puncture action, but also can rotate, so as to better cooperate with the rotary shuttle mechanism below.

[0003] The middle presser foot is one of the key components in a sewing machine. When the needle pierces the fabric, the presser foot can press the fabric to prevent it from moving, ensuring that the needle can sew smoothly; when the needle is lifted, the presser foot also plays an important role, it will bring the thread out to prepare for the next sewing. The head of an existing sewing machine is also equipped with a lifting drive module, which is usually connected to the middle presser foot rod for driving the middle presser foot rod to lift and lower the middle presser foot. In a sewing machine, the middle presser foot can control the stability of the fabric, adjust the tightness of the sewing, and control the sewing speed. Since the sewing direction changes during the sewing process, the needle bar is usually configured to be rotatable so as to adapt to different sewing directions; however, the presser foot in the existing sewing machines usually has a fixed position, and the position of the presser foot cannot adapt to the changing sewing direction, so that the position of the presser foot is inconsistent with the sewing direction, which is not only not conducive to better pressing the fabric during the sewing process, but also prone to problems such as fabric movement and wrinkling, and cannot guarantee the accuracy of sewing, which is not conducive to obtaining smoother and more accurate sewing lines, and needs to be solved urgently. Utility Model Content

[0004] The first aspect of the utility model is to solve the above technical problems and provide a machine head with a rotatable middle presser foot, so that the position of the middle presser foot can be adapted to the sewing direction to obtain a better sewing effect. The main concept is:

[0005] A head of a sewing machine comprises a casing, a needle bar, a middle presser foot rod, a middle presser foot and a lifting drive module, wherein the middle presser foot rod is liftably constrained to the casing, and the lifting drive module is in transmission connection with the middle presser foot rod and is used to drive the middle presser foot rod to lift and lower; it also comprises an orientation adjustment module, the orientation adjustment module comprises a connecting assembly, a rotating component, a rotating power and a transmission component, wherein the connecting assembly is connected to the middle presser foot rod, the rotating component is rotatably connected to the connecting assembly, the middle presser foot is connected to the rotating component, the transmission component is rotatably arranged on the casing, the transmission component is provided with a guide rod parallel to the middle presser foot rod, the rotating component is constructed with a matching opening adapted to the guide rod, and the guide rod passes through the matching opening; the rotating power is in transmission connection with the transmission component and is used to drive the transmission component to rotate, and the transmission component drives the rotating component to rotate through the matching of the guide rod and the matching opening. In this scheme, by configuring a connecting assembly and a rotating component in the orientation adjustment module, and rotatably connecting the rotating component to the connecting assembly, the rotating component has the freedom to rotate relative to the connecting assembly; by connecting the middle presser foot to the rotating component, the middle presser foot has the freedom to rotate relative to the middle presser foot rod; by rotatably arranging the transmission component on the casing, the transmission component has the freedom to rotate relative to the casing; by configuring a guide rod parallel to the middle presser foot rod in the transmission component, and configuring a matching opening adapted to the guide rod in the rotating component, and the guide rod passes through the matching opening, not only the guide rod and the matching opening can form a moving pair in the vertical direction, so that the middle presser foot can normally perform a lifting action under the drive of the lifting drive module; but the rotation of the transmission component can also bring The guide rod is driven to rotate, so that the rotating component can be driven to rotate through the cooperation of the guide rod and the matching mouth, and finally the purpose of driving the middle presser foot to rotate and adjusting the position of the middle presser foot is achieved; by configuring a rotary power in the position adjustment module, the rotary power is connected to the transmission component, so that the rotary power can be used to adjust the position of the middle presser foot in real time, automatically and accurately to adapt to the sewing direction, so that the machine head provided by the scheme, the middle presser foot can not only be raised and lowered, but also can be rotated, so that the position of the middle presser foot can always be adapted to the sewing direction of the machine needle. On the one hand, the middle presser foot can be used to better press the fabric during the sewing process to prevent the fabric from moving and wrinkling. On the other hand, the accuracy of sewing can be effectively guaranteed, which is conducive to smoother and more accurate sewing lines, thereby achieving better sewing effects.

[0006] Furthermore, the transmission component is configured with a first through hole for passing the needle bar, and the rotating component is configured with a second through hole for passing the needle bar, the needle bar passes through the first through hole and the second through hole, and the lower end of the needle bar corresponds to the middle presser foot. By configuring the first through hole and the second through hole, the transmission component and the rotating component can both rotate around the needle bar, which is beneficial to reducing the rotational inertia and improving the rotation efficiency, and is more suitable for high-speed sewing machines.

[0007] Preferably, the first through hole is formed at the central position of the transmission component; the second through hole is formed at the central position of the rotating component.

[0008] In the second aspect of the present invention, the problem of facilitating the assembly of the rotating component is solved. Further, the connection assembly includes an annular flange and at least two clamping blocks. An annular clamping groove is formed on the side surface of the rotating component. Each clamping block is respectively clamped in the clamping groove, and each clamping block is respectively detachably connected to the flange. The flange is fixed to the medium presser foot rod. Through the cooperation of the clamping block and the clamping groove, not only can the rotating component be restricted to prevent the rotating component from detaching from the connection assembly, but also the rotating component has the freedom to rotate relative to the connection assembly. Since the clamping groove is annular, the rotating component can rotate at any angle; by detachably connecting the clamping block to the flange, it is convenient for installation and disassembly, and thus it is more convenient to assemble and disassemble the rotating component.

[0009] Preferably, it includes two clamping blocks, and the two clamping blocks are respectively in a semi-circular arc structure.

[0010] Preferably, the clamping block is provided with a threaded hole, and the flange is provided with a communication hole. The clamping block is connected to the flange through a fastener that fits the communication hole and the threaded hole. So as to achieve detachable connection.

[0011] Preferably, the transmission component includes a first gear portion, and the first gear portion includes teeth for transmission. The rotational power is in transmission connection with the first gear portion. So as to drive the entire transmission component to rotate through the first gear portion.

[0012] Further, at least two guide rods are provided on the transmission component, and each guide rod is uniformly arranged along the circumferential direction. The rotating component is provided with at least two mating ports that fit the respective guide rods. It can not only guide the connection assembly through the cooperation of at least two guide rods and at least two mating ports, which is beneficial to achieving a better guiding effect and effectively preventing the medium presser foot from tilting during the lifting process; moreover, it can transmit the rotational force to the rotating component in the connection assembly through the cooperation of at least two guide rods and at least two mating ports, so that the force distribution of the rotating component is more uniform, and it is not easy to have the problem of stress concentration, making the mating structure more stable and durable, and more conducive to improving the service life.

[0013] In the third aspect of the present utility model, the problem of facilitating the assembly of transmission components is solved. Further, the transmission component further includes a ring-shaped card slot formed on the side surface; and at least two constraint blocks adapted to the ring-shaped card slot, each constraint block is respectively clamped in the ring-shaped card slot, and each constraint block is respectively detachably connected to the casing. Through the cooperation of the constraint block and the ring-shaped card slot, not only can the transmission component be constrained to prevent the transmission component from detaching from the casing, but also the transmission component has a degree of freedom of rotation relative to the casing. Since the ring-shaped card slot forms a circle, the transmission component can rotate at any angle, so as to adjust the angle arbitrarily; by detachably connecting the constraint block to the casing, it is convenient for installation and disassembly, and thus it is more convenient to assemble the transmission component.

[0014] Further, a transmission mechanism is further included. The rotational power is in transmission connection with the transmission mechanism. The transmission mechanism includes a second gear portion adapted to the first gear portion. The second gear portion includes teeth for transmission, and the second gear portion is in transmission connection with the first gear portion. By arranging a transmission mechanism between the rotational power and the first gear portion, not only can the transmission mechanism be used to transmit power, but also the transmission mechanism can be flexibly configured according to actual needs, and the position of the rotational power can be flexibly arranged according to actual needs, so as to be flexibly assembled in the narrow assembly space in the machine head.

[0015] Further, the transmission mechanism further includes a rotating shaft. The rotating shaft is rotatably installed in the casing. The rotational power is in transmission connection with the rotating shaft. The second gear portion meshes with the first gear portion or the second gear portion is connected to the first gear portion through a synchronous belt. This is beneficial to simplify the structure and reduce the volume of the transmission structure, so as to be arranged in the narrow assembly space in the machine head.

[0016] The fourth aspect of the utility model is to solve the problem of achieving better sewing effect more efficiently. Further, the needle bar is provided with a limit stop ring, and the outer side of the limit stop ring is configured with a third gear part, and the third gear part includes teeth for transmission; the transmission mechanism also includes a fourth gear part adapted to the third gear part, and the fourth gear part includes teeth for transmission, and the length of the teeth in the fourth gear part is greater than the length of the teeth in the third gear part, and the fourth gear part is meshed with the third gear part. During the puncture action of the needle bar, the third gear part and the fourth gear part always maintain a meshing state; the rotary power drives the needle bar and the middle presser foot to rotate synchronously through the transmission mechanism. In this scheme, by constructing the third gear part on the outer side of the limit stop ring, and configuring the fourth gear part adapted to the third gear part in the transmission mechanism, and the fourth gear part is meshed with the third gear part, the rotary power can drive the middle presser foot and the needle bar to rotate synchronously through the transmission mechanism; and the middle presser foot and the needle bar are driven to rotate synchronously by the rotary power, so that the orientation of the middle presser foot is always adapted to the sewing direction of the needle bar, which is conducive to more efficient sewing action and better sewing effect. By constructing the length of the teeth in the fourth gear portion to be greater than the length of the teeth in the third gear portion, the third gear portion and the fourth gear portion can always remain in a meshing state during the puncture action of the needle rod, so that the puncture action of the needle rod and the rotation action of the needle rod do not interfere with each other, which can ensure that the needle rod can perform the puncture action normally and ensure that the needle rod can perform the rotation action normally.

[0017] Preferably, the transmission mechanism further comprises a rotating shaft, which is rotatably arranged on the housing, the rotating shaft and the needle bar are parallel to each other, the second gear part and the fourth gear part are respectively arranged on the rotating shaft, and the rotating power is connected to the rotating shaft. The rotating power drives the rotating shaft to rotate, and the rotation of the rotating shaft drives the second gear part and the fourth gear part to rotate synchronously, so that the needle bar and the middle presser foot can be synchronously driven to rotate through the cooperation of the second gear part and the first gear part, and the cooperation of the fourth gear part and the third gear part.

[0018] In the fifth aspect of the present utility model, the problem of achieving a better sewing effect more efficiently is to be solved. Further, a limiting retaining ring is provided on the needle bar, and a third gear portion is constructed on the outer side of the limiting retaining ring. The third gear portion includes teeth for transmission; the length of the teeth in the second gear portion is greater than the length of the teeth in the third gear portion. The second gear portion meshes with the third gear portion, and the first gear portion meshes with the second gear portion. During the puncturing action of the needle bar, the third gear portion and the second gear portion always remain in a meshing state; the rotational power drives the needle bar and the middle presser foot to rotate synchronously through a transmission mechanism. In this solution, by constructing the third gear portion on the outer side of the limiting retaining ring, the second gear portion meshes with the third gear portion, and the second gear portion meshes with the first gear portion, so that the second gear portion can drive the middle presser foot and the needle bar to rotate synchronously; and by driving the middle presser foot and the needle bar to rotate synchronously through the rotational power, the orientation of the middle presser foot always adapts to the sewing direction of the needle bar, which is beneficial to performing the sewing action more efficiently and achieving a better sewing effect. By constructing the length of the teeth in the second gear portion to be greater than the length of the teeth in the third gear portion, during the puncturing action of the needle bar, the second gear portion and the third gear portion can always remain in a meshing state, so that the puncturing action of the needle bar and the rotational action of the needle bar do not interfere with each other, which can not only ensure that the needle bar can perform the puncturing action normally but also ensure that the needle bar can perform the rotational action normally. In addition, in this solution, by meshing the second gear portion with the first gear portion and the third gear portion respectively, the first gear portion and the third gear portion share the second gear portion, which can further simplify the structure and reduce the volume of the entire transmission mechanism, making it more convenient to be assembled in the narrow assembly space inside the machine head.

[0019] Preferably, the transmission mechanism further includes a rotating shaft, the rotating shaft is rotatably arranged on the machine housing, the rotating shaft is parallel to the needle bar, the second gear portion is arranged on the rotating shaft, and the rotational power is in transmission connection with the rotating shaft. The rotational power drives the rotating shaft to rotate, and the rotation of the rotating shaft drives the second gear portion and the fourth gear portion to rotate synchronously, so that the needle bar and the middle presser foot can be driven to rotate synchronously through the cooperation between the second gear portion and the first gear portion and the cooperation between the second gear portion and the third gear portion.

[0020] Further, a puncturing drive module is further included. The puncturing drive module is in transmission connection with the needle bar through the limiting retaining ring and is used to drive the needle bar to perform a puncturing action.

[0021] A sewing machine includes a frame and the machine head, and the machine head is connected to the frame.

[0022] Compared with the prior art, by using the head of a sewing machine provided by the present utility model, the middle presser foot can rotate, enabling the orientation of the middle presser foot to always adapt to the sewing direction. This not only better presses the fabric during sewing to prevent the fabric from moving and wrinkling, but also effectively ensures the accuracy of sewing, facilitating smoother and more accurate sewing lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 FIG. 9 is a schematic structural diagram of a lifting drive module in a head provided in Embodiment 1 of the present utility model.

[0025] Figure 2 FIG. 13 is one of the schematic structural diagrams of the lower end of a head provided in Embodiment 1 of the present utility model.

[0026] Figure 3 FIG. 17 is another schematic structural diagram of the lower end of a head provided in Embodiment 1 of the present utility model.

[0027] Figure 4 FIG. 21 is a schematic structural diagram of a head provided in Embodiment 1 of the present utility model.

[0028] Figure 5 FIG. 25 is a schematic structural diagram of a transmission component in a head provided in Embodiment 1 of the present utility model.

[0029] Figure 6 FIG. 29 is a schematic installation structure diagram of a transmission component in a head provided in Embodiment 1 of the present utility model.

[0030] Figure 7 FIG. 33 is a schematic structural diagram of a rotating component in a head provided in Embodiment 1 of the present utility model.

[0031] Figure 8 FIG. 37 is a schematic structural diagram of a connection component in a head provided in Embodiment 1 of the present utility model.

[0032] Figure 9 FIG. 41 is a schematic structural diagram of a connection component provided in Embodiment 1 of the present utility model.

[0033] Figure 10 FIG. 45 is a cross-sectional view of a connection component provided in Embodiment 1 of the present utility model.

[0034] Figure 11 In the head provided in Embodiment 2 of the present utility model, it is a partial structural schematic diagram of a puncture driving module.

[0035] Figure 12 In the head provided in Embodiment 2 of the present utility model, the second

[0036] Structural schematic diagram of the power synchronously driving the needle bar and the middle presser foot to rotate.

[0037] Figure 13 In the head provided in Embodiment 3 of the present utility model, it is a structural schematic diagram of the rotational power synchronously driving the needle bar and the middle presser foot to rotate.

[0038] Marking description in the figure: housing 1, needle bar 11, sewing needle 12, middle presser foot rod 13, middle presser foot 14, middle presser foot hole 141, first guide member 15, second guide member 16; lifting power 2, lifting transmission mechanism 21, crank 211, connecting rod 212, hinge 213; puncture driving mechanism 3, transmission shaft 31, balance weight 32, crankshaft 33, connecting rod 34, guiding structure 35, puncture power 36, connecting head 37, limit retaining ring 38, third gear portion 381; connecting assembly 4, flange 41, communication hole 42, clamping block 43; rotating member 5, second through hole 51, mating port 52, clamping groove 53; rotating power 6, coupling 61, transmission mechanism 62, rotating shaft 63, second gear portion 64, fourth gear portion 65; transmission member 7, first through hole 71, guiding rod 72, annular clamping groove 73, first gear portion 74, restraint block 75; bearing 81, fastener 82. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Usually, the components of the embodiments of the present utility model described and shown herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.

[0040] Embodiment 1

[0041] In this embodiment, a head of a sewing machine is provided, including a housing 1, a needle bar 11, a middle presser foot rod 13, a middle presser foot 14, a lifting driving module, and an orientation adjustment module. Among them,

[0042] The housing 1 is mainly used for bearing force and is the installation foundation for other structures. For example, Figures 1 - 3 As shown, the housing 1 is provided with a first guide member 15 adapted to the medium pressure foot rod 13. The lower end of the medium pressure foot rod 13 passes through the first guide member 15 and extends out of the housing 1, and the upper end of the medium pressure foot rod 13 is located inside the housing 1. The medium pressure foot rod 13 and the first guide member 15 can form a moving pair along the vertical direction. As shown in Figure 1 the figure, the medium pressure foot rod 13 is constrained to the housing 1 in a liftable manner. In implementation, the first guide member 15 can be indirectly or directly installed on the housing 1, and the first guide member 15 can be a sleeve, a bearing 81, etc.

[0043] The lifting drive module is installed on the housing 1 and can be arranged inside the housing 1. In implementation, the lifting drive module can adopt an existing lifting drive module, and the lifting drive module has various implementation manners. As an example, the lifting drive module can adopt a cylinder or a hydraulic cylinder or an electric push rod. The cylinder or the hydraulic cylinder or the electric push rod can be directly connected to the medium pressure foot rod 13, and the medium pressure foot rod 13 is driven to lift by the telescopic movement of the cylinder or the hydraulic cylinder or the electric push rod, so as to achieve the purpose of lifting and lowering the medium pressure foot 14. As another example, the lifting drive module includes a lifting power source 2 and a lifting transmission mechanism 21. The lifting power source 2 is installed on the housing 1, the lifting power source 2 is in transmission connection with the lifting transmission mechanism 21, and the lifting transmission mechanism 21 is in transmission connection with the medium pressure foot rod 13, so that the medium pressure foot rod 13 can be driven to vertically lift by using the lifting power source 2. The lifting power source 2 can adopt a servo motor or a stepping motor, etc. In implementation, the lifting transmission mechanism 21 also has various implementation manners. As an example, as shown in Figure 1 the figure, the lifting transmission mechanism 21 includes a crank 211 and a connecting rod 212. The lifting power source 2 adopts a motor, and the output shaft of the motor is horizontally arranged. One end of the crank 211 is connected to the output shaft of the motor, one end of the connecting rod 212 is hinged 213 to the other end of the crank 211, and the other end of the connecting rod 212 is hinged 213 to the upper end of the medium pressure foot rod 13. The lifting power source 2 drives the crank 211 to rotate, so as to drive the medium pressure foot rod 13 to vertically lift.

[0044] In this embodiment, the needle bar 11 can adopt an existing needle bar 11 structure. The needle bar 11 is usually vertically arranged. The upper end of the needle bar 11 is located inside the housing 1, and the lower end of the needle bar 11 extends out of the housing 1. As shown in Figures 1 - 3As shown, the needle 12 is usually installed at the lower end of the needle bar 11, and the lower end of the needle bar 11 is usually located above the middle presser foot 14, and corresponds to the middle presser foot hole 141 in the middle presser foot 14. In order to improve the stability of the needle bar 11, during implementation, a second guide member 16 adapted to the needle bar 11 is usually also configured, the second guide member 16 is sleeved on the needle bar 11, and can be indirectly or directly fixed to the housing 1, the needle bar 11 can form a moving pair along the vertical direction with the second guide member 16, and similarly, during implementation, the second guide member 16 can be a sleeve, a bearing 81, etc. In this embodiment, the needle bar 11 is configured to be liftable so as to perform an up and down piercing action during the sewing process, and at the same time, the needle bar 11 is also configured to be rotatable so as to better cooperate with the rotary shuttle mechanism to achieve a perfect stitch. Therefore, in a more complete solution, a puncture drive module for driving the needle bar 11 to perform a puncture action and a rotation drive module for driving the needle bar 11 to rotate are also included, and the puncture drive module and the rotation drive module are respectively connected to the needle bar 11. In this embodiment, the puncture drive module and the rotation drive module can be implemented by existing technologies, and examples are not given here one by one.

[0045] In this embodiment, the middle presser foot 14 is not directly fixed to the middle presser foot rod 13. In this embodiment, the orientation adjustment module includes a connecting component 4, a rotating component 5, a rotating power 6 and a transmission component 7, wherein the connecting component 4 is connected to the middle presser foot rod 13, such as Figures 2 - 4 As shown, during implementation, the connecting assembly 4 can be preferentially connected to the lower end of the middle presser foot rod 13 .

[0046] In this embodiment, the rotating component 5 is rotatably connected to the connecting component 4, so that the rotating component 5 can rotate relative to the connecting component 4. At the same time, the middle presser foot 14 is connected to the rotating component 5, so that the middle presser foot 14 can rotate synchronously with the rotating component 5, and the middle presser foot 14 has the freedom to rotate relative to the middle presser foot rod 13. At the same time, the middle presser foot 14 can also be vertically lifted and lowered under the drive of the middle presser foot rod 13, so that the rotation and lifting of the middle presser foot 14 do not interfere with and affect each other.

[0047] In this embodiment, the transmission component 7 is rotatably arranged on the housing 1, so that the transmission component 7 has a degree of freedom to rotate relative to the housing 1. The transmission component 7 is provided with a guide rod 72 parallel to the middle presser foot rod 13, such as Figure 4 and Figure 5 As shown, at the same time, the rotating component 5 is configured with a matching opening 52 adapted to the guide rod 72, as shown in FIG. Figure 4 and Figure 7 As shown, the lower end of the guide rod 72 can pass through the matching opening 52, and the guide rod 72 and the matching opening 52 can form a moving pair along the vertical direction, such as Figures 2 - 4As shown, the rotating member 5 can vertically move up and down relative to the guide rod 72 to meet the vertical lifting requirements of the middle presser foot 14.

[0048] In this embodiment, the rotating power 6 is in transmission connection with the transmission member 7, so as to drive the transmission member 7 to rotate by using the rotating power 6, and the transmission member 7 can drive the rotating member 5 to rotate through the cooperation of the guide rod 72 and the mating port 52, and finally achieve the purpose of driving the middle presser foot 14 to rotate and adjusting the orientation of the middle presser foot 14.

[0049] To simplify the structure, during implementation, the transmission member 7 is configured with a first through hole 71 for passing through the needle bar 11, as Figures 4 - 6 shown. At the same time, the rotating member 5 is also configured with a second through hole 51 for passing through the needle bar 11, as Figure 4 、 Figure 7 and Figure 8 shown. The needle bar 11 passes through the first through hole 71 and the second through hole 51, which not only enables the lower end of the needle bar 11 to correspond to the middle presser foot 14, but also can effectively reduce the matching difficulty of the transmission member 7, the rotating member 5 and the connecting assembly 4, and effectively simplify the structure. More preferably, during implementation, the first through hole 71 can be preferentially configured at the central position of the transmission member 7; at the same time, the second through hole 51 can also be preferentially configured at the central position of the rotating member 5. During implementation, the second guide member 16 can be installed in the first through hole 71 of the transmission member 7, and the second guide member 16 can be coaxial with the first through hole 71 to better adapt to the needle bar 11.

[0050] During implementation, there are various implementation manners for rotatably connecting the rotating member 5 to the connecting assembly 4. For example, in one implementation manner, the rotating member 5 can be connected to the connecting assembly 4 through a bearing 81; and for facilitating the installation and disassembly of the rotating member 5, in another preferred implementation manner, the connecting assembly 4 includes an annular flange 41 and at least two clamping blocks 43, as Figures 8 - 10As shown, a ring-shaped card slot 53 is formed on the side surface of the rotating member 5, and the center of the card slot 53 can coincide with the center of the second through hole 51. During assembly, each clamping block 43 is respectively clamped in the card slot 53, and each clamping block 43 is respectively detachably connected to the flange 41, so that the rotating member 5 can be rotatably constrained to the connecting assembly 4, and the center of the rotating member 5 can coincide with the center of the flange 41. Through the cooperation of the clamping block 43 and the card slot 53, not only can the rotating member 5 be constrained to prevent it from detaching from the connecting assembly 4, but also the rotating member 5 has a degree of freedom of rotation relative to the connecting assembly 4. Since the card slot 53 is ring-shaped, the rotating member 5 can rotate at any angle; and by detachably connecting the clamping block 43 to the flange 41, it is convenient for installation and disassembly, thus making it more convenient to assemble the rotating member 5. During implementation, the number of clamping blocks 43 can be determined according to actual requirements. By way of example, the connecting assembly 4 in this embodiment includes two clamping blocks 43, and the two clamping blocks 43 are respectively in a semi-circular arc structure, as Figures 8 - 10 shown, the clamping block 43 is formed with a threaded hole. Correspondingly, the flange 41 is formed with an adapted communication hole 42, so that the clamping block 43 can be connected to the flange 41 through a fastener 82 such as a bolt or a screw passing through the adapted communication hole 42 and the threaded hole, as Figures 8 - 10 shown, in order to achieve detachable connection. During implementation, as Figure 8 shown, the flange 41 can be horizontally fixed to the lower end of the medium pressure foot rod 13 through the fastener 82.

[0051] During implementation, there are also various implementation manners for rotatably arranging the transmission member 7 on the machine housing 1. For example, in one implementation manner, the transmission member 7 can be connected to the machine housing 1 through a bearing 81, so that the transmission member 7 can rotate relative to the machine housing 1. And for the convenience of installing and replacing the transmission member 7, in another implementation manner, a ring-shaped card slot 73 is formed on the side surface of the transmission member 7, as Figure 5 and Figure 6 shown; at the same time, the machine head further includes at least two constraint blocks 75 adapted to the ring-shaped card slot 73. During assembly, each constraint block 75 is respectively clamped in the ring-shaped card slot 73, and each constraint block 75 is respectively detachably connected to the machine housing 1, as Figure 6As shown, at the same time, the housing 1 can also be constructed with a hole having a diameter larger than the outer diameter of the transmission member 7, so that the transmission member 7 can be rotatably constrained within the housing 1. During implementation, the center of the first through hole 71 in the transmission member 7 can coincide with the center of the annular slot 73. In this solution, through the cooperation of the restraint block 75 and the annular slot 73, not only can the transmission member 7 be constrained to prevent the transmission member 7 from detaching from the housing 1, but also the transmission member 7 has a degree of freedom to rotate relative to the housing 1. Since the annular slot 73 forms a circle, the transmission member 7 can rotate at any angle; and by detachably connecting the restraint block 75 to the housing 1, it is convenient for installation and disassembly, thus making it more convenient to assemble the transmission member 7. During implementation, the number of restraint blocks 75 can be determined according to actual requirements. By way of example, this embodiment includes two restraint blocks 75, and the two restraint blocks 75 are respectively in a semi-circular arc structure or a similar structure, such as Figures 2 - 4 As shown, the housing 1 is constructed with threaded holes. Correspondingly, the restraint block 75 is constructed with an adapted communication hole 42, so that the restraint block 75 can be threadedly connected to the housing 1 through a fastener 82 such as a bolt or a screw that fits the communication hole 42 and the threaded hole, as Figure 2 and Figure 3 As shown, in order to achieve a detachable connection.

[0052] In this embodiment, the main function of the guide rod 72 is to drive the rotating member 5 to rotate. Since the needle bar 11 already occupies the central position, during implementation, the guide rod 72 is preferably located outside the needle bar 11. During implementation, the number of guide rods 72 can be determined according to actual requirements, and one guide rod 72, two guide rods 72, three guide rods 72, four guide rods 72, etc. can be configured for the transmission member 7. When at least two guide rods 72 are configured for the transmission member 7, the guide rods 72 can be evenly arranged along the circumferential direction of the needle bar 11 respectively, such as Figures 4 - 6 As shown, correspondingly, the rotating member 5 is constructed with at least two mating ports 52 that fit the guide rods 72 respectively, such as Figure 7 and Figure 8 As shown, in order to achieve multi-point cooperation. With such a design, not only can at least two guide rods 72 and at least two mating ports 52 cooperate to guide the connecting assembly 4, which is beneficial to achieving a better guiding effect, effectively preventing the middle presser foot 14 from tilting during the lifting process, and making the lifting process of the middle presser foot 14 more stable and precise; but also the rotation force can be transmitted to the rotating member 5 in the connecting assembly 4 through the cooperation of at least two guide rods 72 and at least two mating ports 52, making the force distribution on the rotating member 5 more uniform, not easily prone to stress concentration problems, making the cooperation structure more stable and durable, and more conducive to improving the service life. During implementation, the guide rod 72 can be a round rod or a square rod, or can also be a round tube or a square tube, etc., and no further examples will be given here.

[0053] Since the rotational power source 6 is in driving connection with the transmission member 7, for the convenience of transmission, in implementation, the transmission member 7 is further provided with a first gear portion 74, and the first gear portion 74 includes teeth for transmission, such as Figures 2 - 6 shown, the rotational power source 6 is in driving connection with the first gear portion 74 so as to drive the entire transmission member 7 to rotate through the first gear portion 74. In implementation, the teeth in the first gear portion 74 can be directly formed on the transmission member 7, such as Figure 5 shown, such that the first gear portion 74 and the transmission member 7 are an integrally formed member. In addition, the first gear portion 74 can also be a gear mounted on the transmission member 7.

[0054] In a more perfect implementation manner, a transmission mechanism 62 is further included. The rotational power source 6 can be fixed to the machine housing 1. The rotational power source 6 preferably adopts a servo motor or a stepper motor. The rotational power source 6 is in driving connection with the transmission mechanism 62. The transmission mechanism 62 includes a second gear portion 64 adapted to the first gear portion 74, such as Figure 3 and Figure 4 shown. The second gear portion 64 includes teeth for transmission, and the second gear portion 64 is in driving connection with the first gear portion 74. In this way, not only can the transmission mechanism 62 be used to transmit power, but also the transmission mechanism 62 can be flexibly configured according to actual requirements, and the position of the rotational power source 6 can be flexibly arranged according to actual requirements so as to be flexibly assembled in the narrow assembly space inside the machine head. The transmission mechanism 62 has various implementation manners. For example, in one implementation manner, the transmission mechanism 62 can include a rotating shaft 63, such as Figure 4 shown. The rotating shaft 63 is rotatably mounted on the machine housing 1. The rotational power source 6 is in driving connection with the rotating shaft 63. The second gear portion 64 is provided on the rotating shaft 63. The second gear portion 64 can be meshed with the first gear portion 74 so as to achieve meshing transmission; the second gear portion 64 can also be connected to the first gear portion 74 through a synchronous belt so as to achieve belt transmission. Both of these two transmission mechanisms 62 are beneficial to simplifying the structure and reducing the volume so as to be arranged in the narrow assembly space inside the machine head. Of course, the transmission mechanism 62 can also have other implementation manners, which will not be exemplified one by one here.

[0055] Such as Figures 1 - 4 shown, the machine head provided in this embodiment can drive the medium presser foot 14 to vertically lift through the lifting drive module, achieving the functions of lifting the medium presser foot 14 and lowering the medium presser foot 14; and can drive the medium presser foot 14 to rotate through the orientation adjustment module, achieving the function of real-time and automatic adjustment of the orientation of the medium presser foot 14. It can be understood that in this implementation, the orientation of the medium presser foot 14 can be characterized by the central plane of the medium presser foot 14 where the medium presser foot hole 141 is located, which will not be elaborated here.

[0056] Embodiment 2

[0057] In some existing sewing machine heads, in order to drive the needle bar 11 to perform a puncture action, in one implementation, the puncture drive module includes a puncture power source 36, a puncture drive mechanism 3, and a connecting head 37. Among them, two spaced-apart limit retaining rings 38 are provided on the needle bar 11. As Figure 11 shown, the connecting head 37 is limited and constrained between the two limit retaining rings 38, and the needle bar 11 can rotate relative to the connecting head 37. The puncture power source 36 can be installed on the machine housing 1, and the puncture power source 36 can be a servo motor or a stepper motor. The puncture drive mechanism 3 also has various implementations. For example, the puncture drive mechanism 3 can include a transmission shaft 31, a balance weight 32, a crankshaft 33, a connecting rod 34, and a guiding structure 35. As Figure 11 shown, among them, the transmission shaft 31 can be connected to the machine housing 1 through a bearing 81, and the puncture power source 36 can be drivingly connected to the transmission shaft 31 through a transmission mechanism such as a coupling 61, a belt drive mechanism, or a gear drive mechanism for driving the transmission shaft 31 to rotate. The balance weight 32 is provided on the transmission shaft 31. One end of the crankshaft 33 is eccentrically connected to the balance weight 32. The upper end of the connecting rod 34 is hinged 213 to the crankshaft 33, and the lower end of the connecting rod 34 is rotatably connected to the connecting head 37. As Figure 11 shown, the connecting head 37 is vertically movably constrained by the guiding structure 35. The guiding structure 35 is parallel to the needle bar 11. The guiding structure 35 can be a guiding groove or a guide rail, etc., so that the puncture power source 36 can be used to drive the needle bar 11 to perform an up-and-down puncture action in the vertical direction. In addition, in the prior art, the puncture drive mechanism 3 also has other implementations, which will not be exemplified one by one here.

[0058] Based on this, to solve the problem of more efficiently achieving a better sewing effect, the main difference between the second embodiment and the first embodiment is that in the sewing machine head provided in this embodiment, a third gear portion 381 is constructed on the outer side of the limit retaining ring 38. As Figure 12 shown, the third gear portion 381 includes teeth for transmission. The teeth are straight teeth, and the length direction of the teeth is the same as the length direction of the needle bar 11. As Figure 12 shown.

[0059] At the same time, the transmission mechanism 62 between the rotation power source 6 and the second gear portion 64 further includes a fourth gear portion 65 adapted to the third gear portion 381. The fourth gear portion 65 includes teeth for transmission. As Figure 12 shown, the length of the teeth in the fourth gear portion 65 is greater than the length of the teeth in the third gear portion 381. The fourth gear portion 65 meshes with the third gear portion 381. As Figure 12As shown, during the puncturing operation of the needle bar 11, the third gear portion 381 and the fourth gear portion 65 always remain in a meshed state, so that the puncturing operation of the needle bar 11 and the rotating operation of the needle bar 11 do not interfere with each other. In this way, it can ensure that the needle bar 11 can perform the puncturing operation normally and can also ensure that the needle bar 11 can perform the rotating operation normally.

[0060] In this embodiment, the rotational power 6 can drive the needle bar 11 and the middle presser foot 14 to rotate synchronously through the transmission mechanism 62, so that the orientation of the middle presser foot 14 always adapts to the sewing direction of the needle bar 11. This not only helps the sewing head to perform the sewing operation more efficiently, but also can use the middle presser foot 14 to better press the fabric during sewing to prevent the fabric from moving and wrinkling. In addition, it can effectively ensure the accuracy of sewing, which is beneficial to making the sewing line smoother and more accurate, thus facilitating the achievement of a better sewing effect.

[0061] More specifically, the transmission mechanism 62 further includes a rotating shaft 63, as Figure 12 shown, the rotating shaft 63 can be rotatably arranged on the machine housing 1 through a bearing 81. The rotating shaft 63 is parallel to the needle bar 11. The second gear portion 64 and the fourth gear portion 65 are respectively arranged on the rotating shaft 63, as Figure 12 shown, the rotational power 6 is in transmission connection with the rotating shaft 63, so that the rotational power 6 can drive the rotating shaft 63 to rotate. The rotation of the rotating shaft 63 can drive the second gear portion 64 and the fourth gear portion 65 to rotate synchronously, so that the needle bar 11 and the middle presser foot 14 can be driven to rotate synchronously through the cooperation between the second gear portion 64 and the first gear portion 74 and the cooperation between the fourth gear portion 65 and the third gear portion 381.

[0062] During implementation, the rotational power 6 can be in transmission connection with the rotating shaft 63 through a linkage mechanism such as a coupling 61, a belt transmission mechanism or a gear transmission mechanism, as Figure 12 shown. During implementation, the second gear portion 64 can be a gear, and the gear is installed on the rotating shaft 63. The second gear portion 64 can also be directly constructed on the rotating shaft 63, so that the rotating shaft 63 is an integrally formed component. Similarly, the fourth gear portion 65 can be a gear column, and the gear column is installed on the rotating shaft 63. The fourth gear portion 65 can also be directly constructed on the rotating shaft 63, so that the rotating shaft 63 is an integrally formed component.

[0063] Embodiment 3

[0064] In some existing sewing machine heads, in one implementation manner, to drive the needle bar 11 to perform a puncturing operation, the puncturing drive module includes a puncturing power 36, a puncturing drive mechanism 3 and a connecting head 37. Among them, two spaced-apart limiting retaining rings 38 are arranged on the needle bar 11, as Figure 11As shown, the connector 37 is limited and constrained between two limiting snap rings 38, and the needle bar 11 can rotate relative to the connector 37. The piercing power 36 can be installed on the machine housing 1, and the piercing power 36 can adopt a servo motor or a stepping motor. The piercing drive mechanism 3 also has various implementation manners. For example, the piercing drive mechanism 3 can include a transmission shaft 31, a balance weight 32, a crankshaft 33, a connecting rod 34, and a guiding structure 35, as Figure 11 shown. Among them, the transmission shaft 31 can be connected to the machine housing 1 through a bearing 81, and the piercing power 36 can be in transmission connection with the transmission shaft 31 through a transmission mechanism such as a coupling 61, a belt drive mechanism, or a gear drive mechanism, for driving the transmission shaft 31 to rotate. The balance weight 32 is arranged on the transmission shaft 31, one end of the crankshaft 33 is eccentrically connected to the balance weight 32, the upper end of the connecting rod 34 is hinged 213 to the crankshaft 33, and the lower end of the connecting rod 34 is rotatably connected to the connector 37, as Figure 11 shown. The connector 37 is vertically movably constrained in the guiding structure 35. The guiding structure 35 is parallel to the needle bar 11. The guiding structure 35 can be a guiding groove or a guide rail, etc., so that the piercing power 36 can be used to drive the needle bar 11 to perform up-and-down piercing actions in the vertical direction. In addition, in the prior art, the piercing drive mechanism 3 also has other implementation manners, which will not be exemplified one by one here.

[0065] Based on this, to solve the problem of more efficiently achieving a better sewing effect, the main difference between this Embodiment 3 and the above Embodiment 1 is that in the sewing machine head provided in this embodiment, a third gear portion 381 is constructed on the outer side of the limiting snap ring 38, as Figure 13 shown. The third gear portion 381 includes teeth for transmission. The teeth are straight teeth, and the length direction of the teeth is the same as the length direction of the needle bar 11, as Figure 13 shown.

[0066] In this embodiment, the length of the teeth in the second gear portion 64 is greater than the length of the teeth in the third gear portion 381. The second gear portion 64 is engaged with the third gear portion 381, as Figure 13 shown. During the piercing action of the needle bar 11, it is ensured that the third gear portion 381 and the second gear portion 64 always remain in an engaged state, so that the piercing action of the needle bar 11 can be independent of the rotation action of the needle bar 11. In this way, it can be ensured that the needle bar 11 can perform the piercing action normally and the needle bar 11 can perform the rotation action normally.

[0067] In this embodiment, the second gear portion 64 is engaged with the third gear portion 381, and the second gear portion 64 is engaged with the first gear portion 74, that is, the first gear portion 74 and the third gear portion 381 are respectively engaged with the second gear portion 64, as Figure 13As shown, the rotary power 6 can drive the needle bar 11 and the middle presser foot 14 to rotate synchronously through the transmission mechanism 62, so that the position of the middle presser foot 14 always matches the sewing direction of the needle bar 11, which is not only conducive to the machine head to perform sewing actions more efficiently, but also can use the middle presser foot 14 to better press the fabric during sewing to prevent the fabric from moving and wrinkling; in addition, the accuracy of sewing can be effectively guaranteed, which is conducive to smoother and more accurate sewing lines, thereby facilitating better sewing effects. In addition, compared with the technical solution in Example 2, this solution can further simplify the structure and reduce the volume of the entire transmission mechanism 62 by meshing the second gear portion 64 with the first gear portion 74 and the third gear portion 381 respectively, so that the first gear portion 74 and the third gear portion 381 share the second gear portion 64, thereby making it easier to assemble in the narrow assembly space in the machine head.

[0068] More specifically, the transmission mechanism 62 further includes a rotating shaft 63, such as Figure 13 As shown, the rotating shaft 63 can be rotatably arranged on the housing 1 through the bearing 81, the rotating shaft 63 and the needle bar 11 are parallel to each other, and the second gear part 64 is arranged on the rotating shaft 63. Figure 13 As shown, the rotary power 6 is connected to the rotating shaft 63 in transmission, so that the rotary power 6 can drive the rotating shaft 63 to rotate, and the rotation of the rotating shaft 63 can drive the first gear part 74 and the third gear part 381 to rotate synchronously, thereby achieving the purpose of driving the needle bar 11 and the middle presser foot 14 to rotate synchronously.

[0069] During implementation, the rotating power 6 can be connected to the rotating shaft 63 through a coupling 61, a belt transmission mechanism or a gear transmission mechanism. Figure 13 In implementation, the second gear portion 64 may be a gear column, which is mounted on the rotating shaft 63. The second gear portion 64 may also be directly constructed on the rotating shaft 63, so that the rotating shaft 63 is an integrally formed component.

[0070] Example 4

[0071] This embodiment provides a sewing machine, including a frame and the above-mentioned head, wherein the head is connected to the frame.

[0072] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.

Claims

1. A head of a sewing machine, comprising a housing, a needle bar, a middle presser bar, a middle presser foot and a lifting drive module, wherein the middle presser bar is liftably constrained to the housing, and the lifting drive module is transmission-connected with the middle presser bar for driving the middle presser bar to lift; characterized in that: It also includes an orientation adjustment module, which includes a connecting assembly, a rotating component, a rotating power and a transmission component, wherein the connecting assembly is connected to the middle presser foot rod, the rotating component is rotatably connected to the connecting assembly, and the middle presser foot is connected to the rotating component; The transmission component is rotatably arranged on the housing, the transmission component is provided with a guide rod parallel to the middle presser foot rod, the rotating component is constructed with a matching opening adapted to the guide rod, and the guide rod passes through the matching opening; The rotating power is in transmission connection with the transmission component and is used to drive the transmission component to rotate. The transmission component drives the rotating component to rotate through the cooperation between the guide rod and the cooperation opening.

2. The sewing machine head according to claim 1, characterized in that: The transmission component is configured with a first through hole for passing the needle bar, and the rotating component is configured with a second through hole for passing the needle bar. The needle bar passes through the first through hole and the second through hole, and the lower end of the needle bar corresponds to the middle presser foot.

3. The sewing machine head according to claim 1, characterized in that: The connecting assembly includes an annular flange and at least two clamping blocks. The side of the rotating component is configured with an annular clamping groove. Each clamping block is respectively clamped in the clamping groove. Each clamping block is respectively detachably connected to the flange, and the flange is connected to the middle presser foot rod.

4. The sewing machine head according to claim 3, characterized in that: It includes two card blocks, and the two card blocks are semicircular arc structures respectively; And / or, the clamping block is configured with a threaded hole, the flange is configured with a connecting hole, and the clamping block is connected to the flange via a fastener adapted to the connecting hole and the threaded hole.

5. The sewing machine head according to any one of claims 1 to 4, characterized in that: It also includes a transmission mechanism, the transmission component includes a first gear part, the first gear part includes teeth for transmission, the rotational power is connected to the transmission mechanism, the transmission mechanism includes a second gear part adapted to the first gear part, the second gear part includes teeth for transmission, and the second gear part is connected to the first gear part.

6. The sewing machine head according to claim 5, characterized in that: The transmission component is provided with at least two guide rods, each guide rod is arranged along the circumferential direction of the needle bar, and the rotating component is constructed with at least two matching openings adapted to each guide rod; And / or, the transmission component further includes a circle of annular grooves constructed on the side; and further includes at least two restraining blocks adapted to the annular grooves, each restraining block is respectively clamped in the annular grooves, and each restraining block is respectively detachably connected to the housing; And / or, the transmission mechanism further comprises a rotating shaft, which is rotatably mounted on the housing, the rotating power is transmission-connected to the rotating shaft, the second gear portion is meshed with the first gear portion or the second gear portion is connected to the first gear portion via a synchronous belt; And / or, it also includes a puncture drive module, which is drivingly connected to the needle rod through a limit ring and is used to drive the needle rod to perform a puncture action.

7. The sewing machine head according to claim 5, characterized in that: The needle bar is provided with a limit stop ring, and a third gear part is constructed on the outer side of the limit stop ring, and the third gear part includes teeth for transmission; The transmission mechanism further includes a fourth gear part adapted to the third gear part, the fourth gear part includes teeth for transmission, the length of the teeth in the fourth gear part is greater than the length of the teeth in the third gear part, the fourth gear part is meshed with the third gear part, and during the puncture action of the needle rod, the third gear part and the fourth gear part always maintain a meshing state; The rotational power drives the needle bar and the middle presser foot to rotate synchronously through the transmission mechanism.

8. The sewing machine head according to claim 7, characterized in that: The transmission mechanism also includes a rotating shaft, which is rotatably arranged on the housing, the rotating shaft and the needle rod are parallel to each other, the second gear part and the fourth gear part are respectively arranged on the rotating shaft, and the rotating power is transmission-connected with the rotating shaft.

9. The sewing machine head according to claim 5, characterized in that: The needle bar is provided with a limit stop ring, and a third gear part is constructed on the outer side of the limit stop ring, and the third gear part includes teeth for transmission; The length of the teeth in the second gear part is greater than the length of the teeth in the third gear part, the second gear part is meshed with the third gear part, and the first gear part is meshed with the second gear part. During the puncture action of the needle rod, the third gear part and the second gear part always maintain a meshing state; The rotational power drives the needle bar and the middle presser foot to rotate synchronously through the transmission mechanism.

10. The sewing machine head according to claim 9, characterized in that: The transmission mechanism also includes a rotating shaft, which is rotatably arranged on the housing, the rotating shaft and the needle rod are parallel to each other, the second gear part is arranged on the rotating shaft, and the rotating power is transmission-connected with the rotating shaft.

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