Sewing machine

Abstract

The utility model relates to a sewing machine which comprises a machine shell, a needle rod, a middle presser foot and a puncture driving module, the needle rod is rotatably arranged, the puncture driving module is in transmission connection with the needle rod and used for driving the needle rod to conduct the puncture action, and the sewing machine is characterized by further comprising a rotary driving module and a connecting structure, the connecting structure is rotationally restrained to the machine shell, the middle presser foot is arranged on the connecting structure and matched with the needle rod, and the rotating power is in transmission connection with the needle rod and the connecting structure and used for driving the needle rod and the middle presser foot to rotate synchronously; according to the sewing machine, the middle presser foot and the needle bar can rotate synchronously, the position of the middle presser foot can be matched with the position of the needle bar all the time, the sewing effect and the sewing precision can be further improved, and the sewing machine is particularly suitable for high-speed sewing machines.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to 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] 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, and is one of the key components of the sewing machine. The lifting and lowering action of the middle presser foot needs to be coordinated with the action of the needle bar in order to perform efficient sewing work. Therefore, the head of the existing sewing machine is usually also equipped with a lifting drive module, which is connected to the middle presser foot rod for driving the middle presser foot rod to lift and lower the middle presser foot to achieve the purpose of lifting and lowering the middle presser foot. In the actual sewing process, the sewing direction may also change, so the needle bar is usually configured to be rotatable to adapt to different sewing directions; in some existing sewing machines, although the position of the center presser foot is adjustable, the adjustment process of the center presser foot position usually has problems of lag and inaccuracy, and cannot synchronously adapt to the change of the needle bar position, especially in high-speed sewing machines, it is difficult for the position of the center presser foot to always match the needle bar position, and as the sewing time increases, the deviation will further increase, which is not only not conducive to better pressing the fabric during the sewing process, and is prone to problems of fabric movement and wrinkling, but also cannot guarantee the accuracy of sewing, and is not conducive to obtaining smoother and more accurate sewing lines. Therefore, how to ensure that the position of the center presser foot always matches the position of the needle bar to improve the sewing effect and sewing accuracy needs to be solved urgently. Utility Model Content

[0004] The first aspect of the utility model aims to solve the problem that the position of the middle presser foot always matches the position of the needle bar, and provides a sewing machine, in which the middle presser foot and the needle bar can rotate synchronously, so that the position of the middle presser foot can always match the position of the needle bar, and there is no problem of action lag. The main concept is:

[0005] A sewing machine includes a machine shell, a needle bar rotatably arranged, a middle presser foot, and a piercing drive module. The piercing drive module is in transmission connection with the needle bar and is used to drive the needle bar to perform a piercing action. It further includes a rotation drive module and a connection structure. The rotation drive module includes a rotation power source. The connection structure is rotatably constrained to the machine shell. The middle presser foot is arranged on the connection structure and is adapted to the needle bar. The rotation power source is in transmission connection with the needle bar and the connection structure respectively, and is used to drive the needle bar and the middle presser foot to rotate synchronously. In this solution, by configuring the connection structure, the connection structure is rotatably constrained to the machine shell, and the middle presser foot is arranged on the connection structure, so that the middle presser foot has a degree of freedom of rotation relative to the machine shell; by configuring the rotation drive module, and the rotation power source is in transmission connection with the needle bar and the connection structure respectively, the rotation power source can be used to drive the needle bar and the middle presser foot to rotate synchronously, so as to synchronously adjust the orientations of the needle bar and the middle presser foot. There is no problem of action lag, nor will there be a problem of reduced accuracy due to cumulative error with the increase of sewing time, ensuring that the orientation of the middle presser foot can always match the orientation of the needle bar. On the one hand, during sewing, the middle presser foot can better press the fabric to prevent the fabric from moving and wrinkling. On the other hand, it can effectively ensure the accuracy of sewing, which is beneficial to making the sewing line smoother and more accurate, thus achieving a better sewing effect, especially suitable for high-speed sewing machines.

[0006] To solve the problem of synchronously driving the needle bar and the middle presser foot with the same power source, further, the rotation drive module further includes a transmission mechanism. The rotation power source is in transmission connection with the transmission mechanism. The needle bar is provided with a third gear portion, and the connection structure is configured with a first gear portion. The transmission mechanism is in transmission connection with the needle bar through the third gear portion and is in transmission connection with the connection structure through the first gear portion. By configuring the transmission mechanism and respectively configuring the third gear portion on the needle bar and the first gear portion on the connection structure, the transmission mechanism can be used to simultaneously engage the needle bar and the connection structure to achieve the purpose of synchronously driving the needle bar and the middle presser foot to rotate.

[0007] To solve the problem that the needle bar can rotate and lift at the same time, further, the transmission mechanism includes a linkage mechanism and a rotating shaft. The rotating shaft is rotatably arranged in the machine shell. The rotating shaft is parallel to the needle bar. The rotation power source is in transmission connection with the rotating shaft through the linkage mechanism. The rotating shaft is provided with a fourth gear portion adapted to the third gear portion. The third gear portion 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. The length of the teeth in the fourth gear portion is greater than the length of the teeth in the third gear portion. The fourth gear portion meshes with the third gear portion. During the piercing action of the needle bar, the third gear portion and the fourth gear portion always remain in a meshing state. This enables the piercing action of the needle bar and the rotation action of the needle bar to not affect and interfere with each other, so that the needle bar can perform the piercing action normally and the rotation action normally.

[0008] In order to solve the problem that the needle bar can perform lifting and puncturing actions, further, the puncture drive module includes a puncture power, a puncture drive mechanism and a connector. Two spaced limit rings are arranged on the needle bar, and the connector is limited and constrained between the two limit rings, and the needle bar can rotate relative to the connector; the puncture power is connected to the connector through the puncture drive mechanism, and is used to drive the connector to lift vertically; the third gear part is constructed on the outside of the limit ring. The rotating shaft is meshed with the limit ring, which can not only achieve the purpose of driving the needle bar to rotate and lift vertically, but also make the structure more simplified and compact.

[0009] In order to solve the problem of synchronous rotation of the needle bar and the middle presser foot, preferably, the first gear part is meshed with the fourth gear part. The fourth gear part is meshed with the third gear part and the first gear part at the same time, which can not only ensure the synchronous rotation of the needle bar and the middle presser foot, but also further simplify the structure and reduce the volume.

[0010] In order to solve the problem of synchronous rotation of the needle bar and the middle presser foot, preferably, the transmission mechanism also includes a second gear part adapted to the first gear part, the second gear part is transmission-connected with the rotating shaft, and the first gear part is meshed with the second gear part. By configuring an additional second gear part to transmission-connect the middle presser foot, it is not only easier to assemble and disassemble, but also the processing difficulty and cost of the rotating shaft can be reduced, and the force of the rotating shaft can be improved, thereby increasing the service life of the rotating shaft.

[0011] Preferably, the second gear part is arranged on the rotating shaft and is coaxial with the rotating shaft, which is convenient for assembly and disassembly and can further maintain the synchronization between the needle bar and the middle presser foot.

[0012] The second aspect of the utility model aims to solve the problem that the middle presser foot and the needle bar can be synchronously rotated and can be lifted and lowered at the same time. Further, it also includes a lifting drive module, the connection structure includes a transmission component, a rotating component and a clamping component, wherein the transmission component is rotatably connected to the housing, and the first gear part is arranged on the transmission component;

[0013] The rotating component can be lifted and restrained by the transmission component, and the transmission component can drive the rotating component to rotate synchronously; the rotating component can be rotatably connected to the clamping component, and the middle presser foot is arranged on the rotating component;

[0014] The lifting drive module is arranged in the machine housing and is in transmission connection with the clamping component, and is used to drive the clamping component to lift. In this solution, by configuring a transmission component in the connection structure, rotatably connecting the transmission component to the machine housing, and restricting the rotating component to the transmission component, the transmission component can drive the rotating component to rotate synchronously, achieving the purpose of adjusting the orientation of the middle presser foot; by restricting the rotating component to be liftable relative to the transmission component, the rotating component also has the freedom to lift relative to the transmission component. At the same time, rotatably connecting the rotating component to the clamping component makes the rotating component not drive the clamping component to rotate, realizing the separation of rotational motion; by drivingly connecting the lifting drive module to the clamping component, the lifting drive module can be used to drive the clamping component to lift, and then drive the rotating component to lift relative to the transmission component, which can not only achieve the purpose of lifting and lowering the middle presser foot, but also make the rotation and lifting functions of the middle presser foot not interfere with each other.

[0015] For the convenience of replacing the middle presser foot, further, the middle presser foot is detachably arranged on the rotating component, so as to facilitate the installation and disassembly of the middle presser foot.

[0016] Further, it also includes a sewing needle, and the sewing needle is installed at the lower end of the needle bar.

[0017] Further, the transmission component is configured with a first through hole for passing through the needle bar, the rotating component is configured with a second through hole for passing through 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, both the transmission component and the rotating component can rotate around the needle bar, which is beneficial to reducing the moment of inertia, improving the rotation efficiency, and being more suitable for high-speed sewing machines.

[0018] The third aspect of the present utility model solves the problem of facilitating the assembly of the transmission component. Preferably, the first gear part includes teeth for transmission, the teeth are configured on the outer side of the transmission component and form a circle along the circumferential direction of the first through hole; a circular groove is configured on the side surface of the transmission component, and the circular groove is located below the first gear part; it also includes at least two restraint blocks adapted to the circular groove, each restraint block is respectively clamped in the circular groove, and each restraint block is respectively detachably connected to the machine housing. The first gear part, the first through hole and the circular groove are coaxial, which is beneficial to simplifying the structure and improving the precision. And through the cooperation of the restraint block and the circular groove, not only can the transmission component be restricted to prevent the transmission component from detaching from the machine housing, but also the transmission component has the freedom to rotate relative to the machine housing. Since the circular groove forms a circle, the transmission component can rotate at any angle, so as to adjust the angle arbitrarily; by detachably connecting the restraint block to the machine housing, it is convenient for installation and disassembly, and thus it is more convenient to assemble the transmission component.

[0019] Further, a guide rod parallel to the needle bar is provided at the lower end of the transmission component. The rotating component is configured with a mating port adapted to the guide rod. The lower end of the guide rod can pass through the mating port, and the guide rod and the mating port form a moving pair in the vertical direction. This not only enables the rotating component to vertically lift and lower relative to the guide rod, but also enables the transmission component to drive the rotating component to rotate synchronously through the cooperation between the guide rod and the mating port.

[0020] To solve the problems of improving the stability and service life of the transmission component, further, the transmission component includes at least two guide rods, and the guide rods are respectively arranged uniformly along the circumferential direction of the first through hole. The rotating component is configured with at least two mating ports adapted to the guide rods. It can not only guide the clamping component through the cooperation between at least two guide rods and at least two mating ports, which is beneficial to achieving a better guiding effect and effectively preventing the middle presser foot from tilting during the lifting and lowering process; but also can transmit the rotational force to the rotating component in the clamping component through the cooperation between at least two guide rods and at least two mating ports, making the force distribution on the rotating component 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.

[0021] In the fourth aspect of the present utility model, to solve the problem of facilitating the assembly of the rotating component, further, the clamping component includes an annular flange and at least two clamping blocks. The side surface of the rotating component is configured with an annular clamping groove, and the center of the clamping groove coincides with the center of the second through hole; each clamping block is respectively clamped in the clamping groove, and each clamping block is respectively detachably connected to the flange, and the flange is in transmission connection with the lifting drive module. Through the cooperation between the clamping block and the clamping groove, it can not only restrain the rotating component to prevent the rotating component from detaching from the clamping component, but also enable the rotating component to have the freedom to rotate relative to the clamping component. 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 more convenient for assembling and disassembling the rotating component.

[0022] Preferably, the lifting drive module includes a lifting power source and a lifting transmission mechanism. The lifting power source is in transmission connection with the clamping component through the lifting transmission mechanism, and the lifting power source is used to drive the clamping component to vertically lift and lower. This achieves the purpose of lifting and lowering the presser foot.

[0023] Compared with the prior art, a sewing machine provided by the present utility model enables the middle presser foot and the needle bar to rotate synchronously, so that the orientation of the middle presser foot can always match the orientation of the needle bar, thereby further improving the sewing effect and sewing accuracy, and better meeting the high-speed requirements of high-speed sewing machines. Description of the Drawings

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0025] Figure 1 One of the schematic structural diagrams of the lower end of the needle bar in a sewing machine provided in Embodiment 1 of the present invention.

[0026] Figure 2 Another schematic structural diagram of the lower end of the needle bar in a sewing machine provided in Embodiment 1 of the present invention.

[0027] Figure 3 One of the schematic structural diagrams of the structure in a sewing machine provided in the embodiments of the present invention, where the rotating power synchronously drives the needle bar and the middle presser foot to rotate.

[0028] Figure 4 Another schematic structural diagram of the structure in a sewing machine provided in the embodiments of the present invention, where the rotating power synchronously drives the needle bar and the middle presser foot to rotate.

[0029] Figure 5 One of the schematic structural diagrams of a puncture drive module in a sewing machine provided in the embodiments of the present invention.

[0030] Figure 6 One of the schematic structural diagrams of a transmission component in a sewing machine provided in the embodiments of the present invention.

[0031] Figure 7 One of the schematic installation structures of a transmission component in a sewing machine provided in the embodiments of the present invention.

[0032] Figure 8 One of the schematic structural diagrams of a rotating component in a sewing machine provided in the embodiments of the present invention.

[0033] Figure 9 One of the schematic structural diagrams at a clamping component in a sewing machine provided in the embodiments of the present invention.

[0034] Figure 10 One of the schematic structural diagrams of a clamping component provided in the embodiments of the present invention.

[0035] Figure 11 One of the cross-sectional views at a clamping component provided in the embodiments of the present invention.

[0036] Figure 12One of the structural schematic diagrams of a lifting drive module in a sewing machine provided in Embodiment 1 of the present utility model.

[0037] Figure 13 One of the structural schematic diagrams of a lifting drive module in a sewing machine provided in Embodiment 1 of the present utility model.

[0038] Marking description in the figure: machine shell 1, needle bar 11, sewing needle 12, lifting rod 13, middle presser foot 14, 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; piercing drive mechanism 3, transmission shaft 31, balance weight 32, crankshaft 33, connecting rod 34, guiding structure 35, piercing power 36, connecting head 37, limit retaining ring 38, third gear portion 381; clamping member 4, flange 41, communication hole 42, clamping block 43; rotating member 5, second through hole 51, mating port 52, card slot 53, convex portion 54, connecting hole 55; 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, guide rod 72, annular card slot 73, first gear portion 74, restraint block 75; bearing 81, fastener 82. Detailed implementation manners

[0039] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to 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. The components of the embodiments of the present utility model described and illustrated 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] Embodiment 1

[0041] A sewing machine is provided in this embodiment, including a machine shell 1, a needle bar 11, a middle presser foot 14 and a connection structure. Among them, the machine shell 1 is mainly used for bearing force and is the installation foundation for other structures. The shape of the machine shell 1 is not limited in this embodiment.

[0042] The needle bar 11 can adopt the existing needle bar 11 structure. The needle bar 11 is vertically arranged in the machine shell 1. The upper end of the needle bar 11 is located inside the machine shell 1, and the lower end of the needle bar 11 extends out of the lower end of the machine shell 1, such as Figures 1 - 2As shown; when in use, the needle 12 is installed at the lower end of the needle bar 11, and the needle bar 11 corresponds to the presser foot hole 141 in the lower middle presser foot 14, and the needle 12 can penetrate into and out of the presser foot hole 141.

[0043] In this embodiment, the needle bar 11 is configured to be able to rise and fall so as to perform an up and down puncture action during the sewing process. At the same time, the needle bar 11 is also configured to be able to rotate so as to better cooperate with the rotary hook mechanism to achieve a perfect stitch. Therefore, the sewing machine also includes 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. The puncture drive module and the rotation drive module are respectively connected to the needle bar 11 in a transmission manner.

[0044] During implementation, the puncture drive module can be implemented using existing technology. For example, in this embodiment, the puncture drive module includes a puncture power 36, a puncture drive mechanism 3 and a connector 37, wherein two spaced limit rings 38 are provided on the needle rod 11. Figures 3 - 5 As shown, the connector 37 is limited between two limit rings 38, and the needle rod 11 can rotate relative to the connector 37. The puncture power 36 can be installed on the housing 1, and can adopt a servo motor or a stepper motor. The puncture power 36 is connected to the connector 37 through the puncture drive mechanism 3 to drive the connector 37 to rise and fall vertically, thereby achieving the purpose of driving the needle rod 11 to rise and fall vertically. In implementation, the puncture drive mechanism 3 also has a variety of implementations. For example, the puncture drive mechanism 3 may include a transmission shaft 31, a balance block 32, a crankshaft 33, a connecting rod 34 and a guide structure 35, such as Figure 5 As shown, the transmission shaft 31 can be connected to the housing 1 through a bearing 81, and the piercing power 36 can be connected to the transmission shaft 31 through a transmission mechanism such as a coupling 61, a belt transmission mechanism or a gear transmission mechanism, so as to drive the transmission shaft 31 to rotate. The balance block 32 is arranged on the transmission shaft 31, and one end of the crankshaft 33 is eccentrically connected to the balance block 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 shown in FIG. Figure 5 As shown, the connector 37 can be vertically moved and constrained by the guide structure 35, the guide structure 35 is parallel to the needle rod 11, and the guide structure 35 can be a guide groove or a guide rail, so that the needle rod 11 can be driven by the puncture power 36 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 embodiments, which will not be described one by one here.

[0045] In this embodiment, the needle bar 11 is provided with a third gear portion 381. In one embodiment, the third gear portion 381 may be a gear, and the gear is provided on the needle bar 11. In this embodiment, the third gear portion 381 is provided on the limit ring 38, that is, the outer side of at least one limit ring 38 is configured with the third gear portion 381.Figure 3 or Figure 4 As shown, the third gear part 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, such as Figure 3 or Figure 4 shown. In implementation, a circle of teeth can be preferably constructed along the outer side of the limit retaining ring 38, and the third gear parts 381 are constructed on the outer sides of both limit retaining rings 38, such as Figure 3 or Figure 4 shown.

[0046] In this embodiment, the rotation drive module includes a rotation power source 6 and a transmission mechanism 62. The rotation power source 6 is in transmission connection with the limit retaining ring 38 through the transmission mechanism 62 to drive the limit retaining ring 38 to rotate. In implementation, the transmission mechanism 62 includes a fourth gear part 65 adapted to the third gear part 381. The fourth gear part 65 includes teeth for transmission, such as Figure 3 and Figure 4 shown. The length of the teeth in the fourth gear part 65 is greater than the length of the teeth in the third gear part 381. The fourth gear part 65 meshes with the third gear part 381, such as Figure 3 and Figure 4 shown. And during the puncture action of the needle bar 11, the third gear part 381 and the fourth gear part 65 always remain in a meshing state, so that the puncture action of the needle bar 11 and the rotation action 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 puncture action normally and can also ensure that the needle bar 11 can perform the rotation action normally.

[0047] In implementation, the transmission mechanism 62 further includes a rotating shaft 63, such as Figure 3 and Figure 4 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 fourth gear part 65 is arranged on the rotating shaft 63, such as Figure 3 and Figure 4 shown. The rotating shaft 63 meshes with the limit retaining ring 38. The rotation power source 6 is in transmission connection with the rotating shaft 63 to drive the rotating shaft 63 to rotate by using the rotation power source 6, so as to achieve the purpose of adjusting the orientation of the needle bar 11. In implementation, the rotation power source 6 can be fixed on the machine housing 1, and a servo motor or a stepping motor, etc. can be preferably adopted. In implementation, the rotation power source 6 can be in transmission connection with the rotating shaft 63 through a coupling 61, a belt transmission mechanism 62 or a gear transmission mechanism 62 and other linkage mechanisms, such as Figure 3 and Figure 4 shown. In implementation, the fourth gear part 65 can be a gear column, the gear column is installed on the rotating shaft 63, and the fourth gear part 65 can also be directly constructed on the rotating shaft 63, so that the rotating shaft 63 is an integrally formed component.

[0048] In this embodiment, the rotational power 6 is also drivingly connected to the middle presser foot 14, and can drive the needle bar 11 and the middle presser foot 14 to rotate synchronously. During implementation, the connecting structure is rotatably constrained to the machine housing 1, such that the connecting structure can rotate relative to the machine housing 1, and the center of rotation of the connecting structure preferably coincides with the center of rotation of the needle bar 11. As Figures 1 - 4 shown, the middle presser foot 14 is disposed on the connecting structure. During the rotation of the connecting structure, the presser foot hole 141 on the middle presser foot 14 always corresponds to the needle bar 11, such that the middle presser foot 14 can always cooperate with the sewing needle 12.

[0049] During implementation, the rotational power 6 is also drivingly connected to the connecting structure, such that the rotational power 6 can synchronously drive the needle bar 11 and the connecting structure, thereby achieving the purpose of synchronously adjusting the orientations of the needle bar 11 and the middle presser foot 14, and there is no problem of lag.

[0050] To achieve the effect of synchronous driving, there are multiple implementation manners. As an example, the connecting structure is configured with a first gear portion 74, as Figure 4 shown, and the fourth gear portion 65 meshes with the first gear portion 74. It can not only synchronously drive the rotation of the needle bar 11 and the connecting structure by using the rotation of the rotating shaft 63, but also further simplify the structure and reduce the volume of the entire linkage mechanism, thereby being more convenient to be assembled in the narrow assembly space within the machine housing 1. It can be understood that to adapt to the fourth gear portion 65, the first gear portion 74 includes teeth for transmission, and the teeth are straight teeth adapted to the fourth gear portion 65, as Figure 4 shown.

[0051] As another example, the transmission mechanism 62 further includes a second gear portion 64, as Figure 3 shown. The connecting structure is configured with a first gear portion 74 adapted to the second gear portion 64, and the second gear portion 64 meshes with the first gear portion 74. The rotational power 6 is drivingly connected to the second gear portion 64, such that the rotational power 6 can also drive the connecting structure to rotate through the transmission mechanism 62, thereby achieving the purpose of driving the needle bar 11 and the middle presser foot 14 to rotate synchronously. During implementation, the second gear portion 64 can be drivingly connected to the rotating shaft 63 and be coaxial with the rotating shaft 63. For example, the second gear portion 64 can be a gear, and this gear can be directly mounted on the rotating shaft 63, as Figure 3 shown. Also, for example, the second gear portion 64 can also be directly configured on the rotating shaft 63; also, for example, the second gear portion 64 can be a gear, and this gear is mounted on a second rotating shaft 63, and the second rotating shaft 63 is coaxially connected to the rotating shaft 63, and the same effect can also be achieved, and no further examples will be given here.

[0052] The sewing machine further includes a lifting drive module for driving the lifting of the middle presser foot 14. The lifting drive module is installed on the machine housing 1 and can be arranged inside the machine housing 1. The connecting structure is liftably constrained to the machine housing 1, and the lifting drive module is in transmission connection with the connecting structure so as to drive the connecting structure to lift, achieving the purpose of driving the lifting of the middle presser foot 14 and realizing the functions of lifting the middle presser foot 14 and lowering the middle presser foot 14. Since in this embodiment, the connecting structure can not only lift relative to the machine housing 1 but also rotate relative to the machine housing 1, in one implementation manner, the connecting structure may include a clamping member 4, a rotating member 5 and a transmission member 7, as Figure 1 and Figure 2 shown. Among them, the transmission member 7 is rotatably connected to the machine housing 1, and the first gear portion 74 is arranged on the transmission member 7; the rotating member 5 is liftably constrained to the transmission member 7, and the transmission member 7 can drive the rotating member 5 to rotate synchronously; at the same time, the rotating member 5 is rotatably connected to the clamping member 4, and the clamping member 4 is in transmission connection with the lifting drive module, so that the lifting drive module can be conveniently installed on the machine housing 1, and the middle presser foot 14 is arranged on the rotating member 5. During use, the lifting drive module can drive the clamping member 4 to lift vertically, thereby driving the rotating member 5 to lift synchronously, achieving the purpose of lifting the middle presser foot 14 and lowering the middle presser foot 14. At the same time, the rotation power 6 can drive the transmission member 7 to rotate, and the transmission member 7 can drive the rotating member 5 to rotate synchronously, achieving the purpose of adjusting the orientation of the middle presser foot 14. Configuring the connecting structure with this kind of structure enables the rotation and lifting functions of the middle presser foot 14 not to interfere with each other.

[0053] 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 6 - 7 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 Figures 8 - 11 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 below, but also can effectively reduce the matching difficulty of the transmission member 7, the rotating member 5 and the clamping member 4, effectively simplify the structure and reduce the size. 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.

[0054] There are various implementation manners for rotatably arranging the transmission member 7 on the machine housing 1. For example, the transmission member 7 can be connected to the machine housing 1 through a bearing 81, and the needle bar 11 passes through the center of the bearing 81. Another example is that a circular groove 53 is formed on the side surface of the transmission member 7, as Figure 5 and Figure 6As shown, the annular slot 53 is located below the first gear portion 74, and the first gear portion 74, the first through hole 71, and the annular slot 53 are coaxial. At the same time, this sewing machine further includes at least two restraint blocks 75 adapted to the annular slot 53. During assembly, each restraint block 75 is respectively clamped in the annular slot 53, and each restraint block 75 is respectively detachably connected to the machine housing 1 through fasteners 82 such as bolts or screws, as Figure 1 , Figure 2 and Figure 7 shown, so as to achieve the purpose of rotatably restraining the transmission component 7 to the machine housing 1. Through the cooperation of the restraint block 75 and the annular slot 53, not only can the transmission component 7 be restrained to prevent the transmission component 7 from detaching from the machine housing 1, but also it is convenient for installation and disassembly, thus making it more convenient to assemble the transmission component 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, as Figure 1 , Figure 2 and Figure 7 shown. The machine housing 1 is provided with threaded holes. Correspondingly, the restraint block 75 is provided with adapted communication holes 42, so that the restraint block 75 can be threadedly connected to the machine housing 1 through bolts or screws and other fasteners 82 that fit the communication holes 42 and the threaded holes, as Figure 1 , Figure 2 and Figure 7 shown, in order to achieve detachable connection.

[0055] As Figure 1 , Figure 2 , Figure 6 and Figure 7 shown, a guide rod 72 parallel to the needle bar 11 is provided at the lower end of the transmission component 7. At the same time, the rotating component 5 is provided with a mating port 52 adapted to the guide rod 72, as Figure 1 and Figure 2 shown. The lower end of the guide rod 72 can pass through the mating port 52, and the guide rod 72 and the mating port 52 can form a moving pair in the vertical direction, as Figures 1 - 2 shown, so that the rotating component 5 can vertically lift relative to the guide rod 72 to meet the vertical lifting requirements of the middle presser foot 14. The guide rod 72 is arranged at a position that is not the rotation center, as Figure 1 , Figure 2 , Figure 6 and Figure 7 shown. The guide rod 72 is arranged outside the first through hole 71, so that when the transmission component 7 rotates, the rotating component 5 can be driven to rotate through the cooperation of the guide rod 72 and the mating port 52, achieving the purpose of driving the middle presser foot 14 to rotate and adjusting the orientation of the middle presser foot 14. The number of guide rods 72 can be determined according to actual requirements. When the transmission component 7 is provided with at least two guide rods 72, each guide rod 72 can be evenly arranged along the circumferential direction of the needle bar 11, as Figures 6 - 7As shown, correspondingly, the rotating member 5 is configured with at least two mating ports 52 adapted to the respective guide rods 72, such as Figure 8 As shown, in order to achieve multi-point mating, with such a design, not only can the clamping member 4 be guided by the cooperation of at least two guide rods 72 and at least two mating ports 52, which is beneficial to achieving a better guiding effect and effectively preventing the middle presser foot 14 from tilting during the lifting process, making the lifting process of the middle presser foot 14 more stable and accurate; but also the rotational force can be transmitted to the rotating member 5 in the clamping member 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 mating structure more stable and durable, and more conducive to improving the service life. In 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.

[0056] During the rotation of the rotating member 5, the presser foot hole 141 on the middle presser foot 14 can maintain a state corresponding to the center of the second through hole 51, so that the middle presser foot 14 and the needle bar 11 can form a high-precision fit. And there are various implementation methods for rotatably connecting the rotating member 5 to the clamping member 4. For example, the rotating member 5 can be connected to the clamping member 4 through a bearing 81. At this time, the clamping member 4 can be configured as an annular structure, and the rotating member 5 is connected to the inner side of the clamping member 4 through the bearing 81. Another example is that the clamping member 4 can include an annular flange 41 and at least two clamping blocks 43, such as Figures 8 - 11 As shown, correspondingly, the side surface of the rotating member 5 is configured with an annular slot 53, and the center of the slot 53 can coincide with the center of the second through hole 51. During assembly, each clamping block 43 is respectively clamped in the 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 clamping member 4, and the center of the rotating member 5 can coincide with the center of the flange 41, such as Figures 8 - 11 As shown. This can not only constrain the rotating member 5 and prevent the rotating member 5 from detaching from the clamping member 4, but also the rotating member 5 can rotate at any angle, and it is very convenient for installation and disassembly, and more convenient for assembling the rotating member 5. In implementation, the number of clamping blocks 43 can be determined according to actual needs. As an example, the clamping member 4 can include two clamping blocks 43, and the two clamping blocks 43 are respectively in a semi-circular arc structure, such as Figures 8 - 11 As shown, the clamping block 43 is configured with a threaded hole. Correspondingly, the flange 41 is configured with an adapted communication hole 42. The clamping block 43 can be connected to the flange 41 through a fastener 82 such as a bolt or a screw that fits the communication hole 42 and the threaded hole, such as Figures 8 - 11 As shown, so as to achieve detachable connection.

[0057] In implementation, the lifting drive module may include a lifting power source 2, which is in transmission connection with the clamping member 4, so as to drive the clamping member 4 to vertically lift by using the lifting power source 2. In implementation, the lifting power source 2 is arranged on the machine housing 1. The lifting power source 2 may adopt a cylinder, a hydraulic cylinder or an electric push rod, and the cylinder, the hydraulic cylinder or the electric push rod may be directly or indirectly connected to the clamping member 4, so as to realize the lifting function through the vertical telescoping of the cylinder, the hydraulic cylinder or the electric push rod, and achieve the purpose of lifting the middle presser foot 14 and lowering the middle presser foot 14. In addition, in another implementation manner, the lifting power source 2 may adopt a servo motor or a stepping motor. At this time, the lifting drive module further includes a lifting transmission mechanism 21. The lifting power source 2 is installed on the machine 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 clamping member 4, so that the clamping member 4 can be driven to vertically lift by using the lifting power source 2. In implementation, the lifting transmission mechanism 21 also has various implementation manners. For example, the lifting transmission mechanism 21 may include a crank 211, a connecting rod 212 and a lifting rod 13. As Figure 12 and Figure 13 shown, the lifting power source 2 adopts a servo motor, the output shaft of the servo motor is horizontally arranged, one end of the crank 211 is connected to the output shaft of the servo motor, one end of the connecting rod 212 is hinged 213 to the other end of the crank 211, the other end of the connecting rod 212 is hinged 213 to the upper end of the lifting rod 13, and the lifting rod 13 is constrained to be liftable in the machine housing 1. For example, as Figure 12 and Figure 13 shown, the machine housing 1 is further provided with a first guiding member 15. The lifting rod 13 passes through the first guiding member 15 and forms a vertical moving pair with the first guiding member 15, as Figure 12 and Figure 13 shown. In implementation, the first guiding member 15 may preferably adopt a sleeve. When in use, the lifting power source 2 can drive the crank 211 to rotate, so as to achieve the purpose of driving the middle presser foot 14 to vertically lift.

[0058] In a more perfect solution, as Figure 13 shown, this sewing machine is further configured with a second guiding member 16 adapted to the needle bar 11. The second guiding member 16 is sleeved on the needle bar 11 and can be indirectly or directly fixed to the machine housing 1. The needle bar 11 can form a vertical moving pair with the second guiding member 16 to improve the stability of the high-speed up and down movement of the needle bar 11. In implementation, the second guiding member 16 may adopt a sleeve, and the second guiding member 16 may be installed in the first through hole 71 of the transmission member 7, and the second guiding member 16 is coaxial with the first through hole 71 to better adapt to the needle bar 11.

[0059] To facilitate the replacement of the middle presser foot 14, in implementation, the middle presser foot 14 can be detachably installed on the rotating member 5 through fasteners 82 such as bolts or screws. For example, as Figure 8 andFigure 9 As shown, a convex portion 54 protruding downward is formed at the lower end of the rotating portion. A connecting hole 55 is formed in the convex portion 54, and the connecting hole 55 is adapted to the elongated hole on the middle presser foot 14, so that the middle presser foot 14 can be detachably mounted on the convex portion 54 by using a fastener 82 adapted to the connecting hole 55.

[0060] It can be understood that in this embodiment, the orientation of the middle presser foot 14 can be characterized by the central plane of the middle presser foot 14 where the presser foot hole 141 is located, which will not be elaborated here.

[0061] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention.

Claims

1. A sewing machine, comprising a housing, a rotatable needle bar, a middle presser foot and a puncture drive module, wherein the puncture drive module is connected to the needle bar in a driving manner and is used to drive the needle bar to perform a puncture action, characterized in that: It also includes a rotation drive module and a connecting structure, wherein the rotation drive module includes a rotational power, the connecting structure is rotatably constrained to the casing, the middle presser foot is arranged on the connecting structure and is adapted to the needle bar, and the rotational power is respectively transmission-connected to the needle bar and the connecting structure, and is used to drive the needle bar and the middle presser foot to rotate synchronously.

2. The sewing machine according to claim 1, characterized in that: The rotary drive module also includes a transmission mechanism, and the rotary power is connected to the transmission mechanism; the needle bar is provided with a third gear portion, and the connecting structure is constructed with a first gear portion. The transmission mechanism is connected to the needle bar through the third gear portion, and is connected to the connecting structure through the first gear portion.

3. The sewing machine according to claim 2, characterized in that: The transmission mechanism includes a linkage mechanism and a rotating shaft. The rotating shaft is rotatably arranged on the casing. The rotating shaft and the needle rod are parallel to each other. The rotational power is connected to the rotating shaft through the linkage mechanism. The rotating shaft is provided with a fourth gear portion adapted to the third gear portion. The third gear portion includes teeth for transmission. The teeth are straight teeth, and the length direction of the teeth is consistent with the length direction of the needle rod. The length of the teeth in the fourth gear portion is greater than the length of the teeth in the third gear portion. The fourth gear portion is meshed with the third gear portion. During the puncture action of the needle rod, the third gear portion and the fourth gear portion always remain in a meshing state.

4. The sewing machine according to claim 3, characterized in that: The puncture drive module includes a puncture power, a puncture drive mechanism and a connector. Two spaced-apart limit rings are provided on the needle rod. The connector is limited and constrained between the two limit rings, and the needle rod can rotate relative to the connector. The puncture power is connected to the connector through the puncture drive mechanism and is used to drive the connector to rise and fall vertically. The third gear portion is constructed on the outside of the limit ring.

5. The sewing machine according to claim 3, characterized in that: The first gear portion is meshed with the fourth gear portion; Alternatively, the transmission mechanism further includes a second gear portion adapted to the first gear portion, the second gear portion is transmission-connected to the rotating shaft, and the first gear portion is meshed with the second gear portion.

6. The sewing machine according to claim 2, characterized in that: It also includes a lifting drive module, and the connection structure includes a clamping component, a rotating component and a transmission component, wherein: The transmission component is rotatably connected to the housing, and the first gear portion is arranged on the transmission component; The rotating component can be lifted and restrained by the transmission component, and the transmission component can drive the rotating component to rotate synchronously; the rotating component can be rotatably connected to the clamping component, and the middle presser foot is arranged on the rotating component; The lifting drive module is arranged on the housing and is drivingly connected with the clamping component to drive the clamping component to lift.

7. The sewing machine according to claim 6, 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.

8. The sewing machine according to claim 7, characterized in that The first gear part includes teeth for transmission, the teeth are configured on the outside of the transmission component and form a circle along the circumferential direction of the first through hole; the side of the transmission component is configured with a circle of annular grooves, the annular grooves are located below the first gear part; and at least two restraining blocks adapted to the annular grooves are further included, each restraining block is respectively clamped in the annular grooves, and each restraining block is respectively detachably connected to the housing; And / or, the clamping component includes an annular flange and at least two clamping blocks, the side of the rotating component is constructed with an annular clamping groove, the center of the clamping groove coincides with the center of the second through hole; each clamping block is respectively clamped in the clamping groove, and each clamping block is respectively detachably connected to the flange, and the flange is transmission-connected to the lifting drive module.

9. The sewing machine according to claim 7, characterized in that: The lower end of the transmission component is provided with a guide rod parallel to the needle bar, the rotating component is constructed with a matching opening adapted to the guide rod, the lower end of the guide rod passes through the matching opening, and the guide rod and the matching opening constitute a moving pair along the vertical direction.

10. The sewing machine according to claim 9, characterized in that The transmission component includes at least two guide rods, each of which is evenly arranged along the circumferential direction of the first through hole, and the rotating component is configured with at least two matching openings adapted to each of the guide rods; Alternatively, the lifting drive module includes a lifting power and a lifting transmission mechanism, the lifting power is connected to the clamping component through the lifting transmission mechanism, and the lifting power is used to drive the clamping component to lift vertically.

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