Presser foot mechanism and buttonholing machine

Abstract

The invention discloses a presser foot mechanism and a buttonholing machine and belongs to the technical field of sewing machines, the presser foot mechanism comprises a presser foot plate with a hollow middle part, a machine needle penetrates through the middle part of the presser foot plate, the presser foot mechanism further comprises a presser foot device, the presser foot device is provided with a presser foot piece, the presser foot piece is located in the presser foot plate, and the presser foot piece is provided with a presser foot. A gap is reserved between the presser foot piece and the machine needle, and the presser foot piece is used for pressing cloth in the presser foot plate. According to the presser foot mechanism, the presser foot plate is matched with the presser foot device, a certain distance is kept between the presser foot piece and the machine needle, the problem that cloth fluctuates along with the machine needle is effectively avoided, and therefore the cloth pressing effect and the sewing stability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewing machines, in particular to a presser foot mechanism and a keyhole machine. BACKGROUND

[0002] As a special type of industrial sewing machine, the keyhole machine is mainly responsible for processing the buttonholes in clothing. This machine plays a crucial role in the sewing process, especially in handling the buttonhole production of various clothing. Traditional keyhole machines use rectangular hollow-shaped presser feet to fix and move the fabric, ensuring the smooth progress of the sewing process.

[0003] However, the presser foot design in the prior art has some defects. Since the left and right pressing positions of the presser foot are too close to the needle, while the front and back pressing positions are far away from the needle, it leads to the fabric easily following the needle fluctuation during the sewing process, especially when dealing with thin elastic fabric, the elastic properties of the fabric make it easy to move upwards following the needle. This movement not only affects the sewing efficiency, but also may cause thread breakage or needle skipping due to unstable loop formation, seriously affecting the sewing quality and the reliability of the machine. SUMMARY

[0004] The purpose of the present application is to provide a presser foot mechanism that, through the cooperation of the presser foot plate and the presser foot device, maintains a certain distance between the presser foot and the needle, effectively avoiding the problem of fabric following the needle fluctuation, thereby improving the pressing effect of the fabric and the stability of the sewing. Another purpose of the present application is to provide a keyhole machine.

[0005] To achieve the above-mentioned purpose, the present application provides a presser foot mechanism, comprising a presser foot plate with a hollow middle part, the middle part of the presser foot plate passes through the needle, the presser foot mechanism further comprises a presser foot device, the presser foot device is provided with a presser foot, the presser foot is located in the presser foot plate, and a distance is left between the presser foot and the needle, the presser foot is used to press the fabric in the presser foot plate.

[0006] In some embodiments, the presser foot device comprises:

[0007] a mounting assembly;

[0008] a presser foot assembly rotatably mounted on the mounting assembly, the presser foot assembly is provided with the presser foot, and the distance between the presser foot and the side of the fabric away from the presser foot is adjusted by the rotation angle of the presser foot assembly relative to the mounting assembly.

[0009] In some embodiments, the presser foot device further comprises:

[0010] a pre-pressing assembly mounted on the mounting assembly, the pre-pressing assembly is connected with the presser foot assembly, and the pre-pressing assembly is used to apply a pre-pressing force to the presser foot assembly to drive the presser foot assembly to rotate so as to press the fabric.

[0011] In some embodiments, the mounting assembly comprises:

[0012] a presser foot mounting base;

[0013] a presser foot swing arm base fixedly mounted on the presser foot mounting base, the presser foot swing arm base being provided with a rotating shaft, the rotating shaft being provided with a sliding bearing, the presser foot assembly being sleeved on the sliding bearing.

[0014] In some embodiments, the mounting assembly comprises a presser foot swing arm base on which the presser foot assembly is rotatably mounted; the pre-pressing assembly comprises:

[0015] a torsion spring shaft fixedly mounted on the presser foot swing arm base;

[0016] a torsion spring fixedly mounted on the torsion spring shaft, the extended end of the torsion spring abutting against the presser foot assembly.

[0017] In some embodiments, the mounting assembly comprises a presser foot swing arm base; the presser foot assembly comprises a presser foot swing arm, the presser foot swing arm being rotatably mounted on the presser foot swing arm base;

[0018] wherein the presser foot is rotatably mounted on the presser foot swing arm, or the presser foot is fixedly mounted on the presser foot swing arm.

[0019] In some embodiments, the presser foot device further comprises a torsion spring for driving the presser foot swing arm to rotate so as to press the presser foot against the fabric, the presser foot swing arm being provided with a clamping groove, the clamping groove abutting against the extended end of the torsion spring; and / or,

[0020] the presser foot swing arm is provided with a limiting arm, the limiting arm limiting the rotation angle of the presser foot assembly relative to the mounting assembly by contacting the presser foot swing arm base.

[0021] In some embodiments, the presser foot is provided with a flat plate structure, the flat plate structure being located on one side of the needle; or,

[0022] the presser foot is provided with a flat plate structure, the flat plate structure being provided with a needle slot, the needle passing through the needle slot.

[0023] In some embodiments, the presser foot plate is mounted on a first mounting mechanism of the lock eye machine, the first mounting mechanism being used for controlling the movement and pressing of the presser foot plate; the presser foot device is mounted on a second mounting mechanism of the lock eye machine, the second mounting mechanism being used for controlling the pressing of the presser foot.

[0024] wherein the first mounting mechanism comprises:

[0025] a moving arm;

[0026] A track frame is fixedly installed on the moving arm, and the track frame is provided with a sliding groove, and the presser foot plate is installed on the track frame;

[0027] The second mounting mechanism comprises:

[0028] A mounting rod;

[0029] A pulley support is fixedly installed on the mounting rod, and the presser foot device is installed on the pulley support, and the pulley support is rotationally installed with a pulley, and the pulley moves along the sliding groove, so that the first mounting mechanism controls the movement of the presser foot plate and the lifting of the presser foot plate, and the second mounting mechanism controls the lifting of the presser foot device.

[0030] The application also provides a lock eye machine comprising the above-mentioned presser foot mechanism.

[0031] With respect to the above background technology, the presser foot mechanism provided by the application mainly comprises a presser foot plate with a hollow middle part, and the middle part of the presser foot plate passes through a needle, and the presser foot mechanism further comprises a presser foot device, and the presser foot device is provided with a presser foot element, and the presser foot element is located in the presser foot plate, and a space is left between the presser foot element and the needle, and the presser foot element is used to press the fabric in the presser foot plate.

[0032] In traditional lock eye machines, the design of the presser foot is usually rectangular hollow shape, which makes the fabric susceptible to the action of the needle during sewing and fluctuates, especially when dealing with thin elastic fabric, the elastic properties of the fabric will cause it to move upward following the needle, thereby affecting the formation of the thread loop, causing the problems of thread breakage or needle skipping. These problems not only reduce the sewing efficiency, but also affect the quality of the finished product. In view of this problem, the presser foot mechanism provided by the application is innovatively designed. The presser foot mechanism is composed of a presser foot plate with a hollow middle part and a presser foot device, wherein the middle part of the presser foot plate passes through a needle, and the presser foot device comprises a presser foot element located in the presser foot plate. A space is deliberately left between the presser foot element and the needle, which allows the presser foot element to press the fabric while maintaining a certain distance from the needle. Through the cooperation of the presser foot plate and the presser foot device, the constant distance maintained between the presser foot element and the needle ensures the stable pressing of the fabric during the sewing process, effectively avoiding the fluctuation of the fabric caused by the action of the needle, thereby maintaining the continuity and stability of the sewing process.

[0033] Due to the cooperation of the presser foot plate and the presser foot device, and the certain distance maintained between the presser foot element and the needle, the stability of the fabric during the sewing process is significantly improved. The fabric no longer follows the movement of the needle due to the rise of the needle, which helps to maintain the stable formation of the thread loop and reduces the phenomenon of needle skipping and thread breakage caused by unstable thread loop. This design not only improves the pressing effect of the fabric and ensures the smoothness of the sewing process, but also improves the stability of the sewing, thereby improving the quality and production efficiency of the final product.

[0034] In combination with the above structure and process, it can be seen that the presser foot mechanism has at least the following beneficial effects: the presser foot mechanism cooperates with the presser foot plate and the presser foot device, the presser foot member is kept at a certain distance from the needle, effectively avoiding the problem that the cloth follows the needle and fluctuates, thereby improving the pressing effect of the cloth and the stability of the sewing. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0036] Figure 1 A schematic view of the presser foot mechanism and the buttonholing machine provided in the embodiments of the present application;

[0037] Figure 2 A schematic view of the presser foot plate and the presser foot device provided in the embodiments of the present application;

[0038] Figure 3 A schematic view of the presser foot plate provided in the embodiments of the present application;

[0039] Figure 4 A schematic view of the presser foot device provided in the embodiments of the present application;

[0040] Figure 5 An exploded view of the presser foot device provided in the embodiments of the present application;

[0041] Figure 6 A schematic view of the presser foot assembly provided in another embodiment of the present application;

[0042] Figure 7 A schematic view of the presser foot member provided in another embodiment of the present application;

[0043] Figure 8 An installation view of the presser foot plate and the presser foot device provided in the embodiments of the present application;

[0044] Figure 9 A schematic view of the pulley bracket, the pulley and the track frame provided in the embodiments of the present application.

[0045] Wherein:

[0046] the buttonholing machine 100,

[0047] the presser foot plate 1,

[0048] the needle 2,

[0049] the presser foot device 3,

[0050] The mounting assembly 31, the presser foot mounting base 311, the presser foot swing arm base 312, the rotating shaft 313, the sliding bearing 314,

[0051] The presser foot assembly 32, the presser foot swing arm 321, the clamping groove 3211, the limiting arm 3212, the presser foot piece 322, the flat plate structure 3221, the needle groove 3222, the shaft position screw 323,

[0052] The pre-pressing assembly 33, the torsion spring shaft 331, the torsion spring 332,

[0053] The first mounting mechanism 4, the moving arm 41, the track frame 42, the sliding groove 421,

[0054] The second mounting mechanism 5, the mounting rod 51, the pulley bracket 52, the pulley 53. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the protection scope of the present application.

[0056] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0057] Please refer to Figure 1 and Figure 2 , Figure 1 The schematic view of the presser foot mechanism and the keyhole machine provided by the embodiments of the present application, Figure 2 The schematic view of the presser foot plate and the presser foot device provided by the embodiments of the present application.

[0058] In a specific embodiment, as shown in Figure 1 and Figure 2 , the presser foot mechanism provided by the embodiments of the present application mainly includes a presser foot plate 1 with a middle part cut open, the presser foot plate 1 passes through a needle 2 in the middle part, and the presser foot mechanism further includes a presser foot device 3, the presser foot device 3 is provided with a presser foot piece 322, the presser foot piece 322 is located in the presser foot plate 1, and a space is left between the presser foot piece 322 and the needle 2, and the presser foot piece 322 is used to press the cloth in the presser foot plate 1.

[0059] Please refer to Figure 3 , Figure 3 The schematic view of the presser foot plate provided by the embodiments of the present application.

[0060] In some cases, the presser foot plate 1 is a rectangular hollow shape, resulting in the left and right pressing positions being closer to the needle, and the front and back pressing positions being farther away from the needle. The left and right directions and the front and back directions correspond to the arrow directions in Figure 2 .

[0061] The rectangular hollow shape is a conventional design of the presser foot plate 1 in the traditional lockstitch machine 100. This design makes the fabric susceptible to the action of the needle 2 during sewing, especially when dealing with thin elastic fabric. The elastic properties of the fabric can cause it to follow the needle 2 upward, affecting the formation of the thread loop and causing problems such as thread breakage or needle skipping. These problems not only reduce sewing efficiency, but also affect the quality of the finished product.

[0062] To solve this problem, the presser foot mechanism provided in the present application is innovatively designed. The presser foot mechanism is composed of a presser foot plate 1 with a hollow middle part and a presser foot device 3. The presser foot plate 1 passes through the needle 2 in the middle, and the presser foot device 3 includes a presser foot piece 322 located in the presser foot plate 1. The presser foot piece 322 is intentionally spaced apart from the needle 2, which allows the presser foot piece 322 to maintain a certain distance from the needle 2 while pressing the fabric. Through the cooperation of the presser foot plate 1 and the presser foot device 3, the constant distance between the presser foot piece 322 and the needle 2 ensures the stable pressing of the fabric during sewing, effectively avoiding the fabric following the needle 2 and rising, thereby maintaining the continuity and stability of the sewing process.

[0063] Due to the cooperation of the presser foot plate 1 and the presser foot device 3, and the certain distance maintained between the presser foot piece 322 and the needle 2, the stability of the fabric during sewing is significantly improved. The fabric no longer follows the needle 2 and moves upward, which helps to maintain the stable formation of the thread loop and reduces the phenomenon of needle skipping and thread breakage caused by unstable thread loops. This design not only improves the pressing effect of the fabric and ensures the smoothness of the sewing process, but also improves the stability of the sewing, thereby improving the quality and production efficiency of the final product.

[0064] In combination with the above structure and process description, it can be seen that the presser foot mechanism has at least the following beneficial effects: the presser foot mechanism cooperates with the presser foot plate 1 and the presser foot device 3, and the presser foot piece 322 maintains a certain distance from the needle 2, effectively avoiding the problem of the fabric following the needle 2 and rising, thereby improving the pressing effect of the fabric and the stability of the sewing.

[0065] It should be noted that, in addition to the rectangular hollow shape mentioned in the above description, for other hollow shapes of the presser foot plate 1, they should also belong to the scope of the present application.

[0066] In addition, the presser foot plate 1 can be a single plate for pressing the fabric or a combination of multiple plates, which is not limited herein; the presser foot plate 1 can be a single plate arranged on the lockstitch machine in the form of a single plate pressing the fabric, or a combination of multiple plates, one plate arranged on the lockstitch machine and the other plate pressing the fabric, which is not limited herein.

[0067] It should be noted that the presser foot plate 1 and the presser foot device 3 should be installed on different mechanisms of the template machine, and the actions of the presser foot plate 1 and the presser foot device 3 are at least not completely synchronized during the operation of the template machine, for example, the movement of the presser foot device 3 can be avoided when the presser foot plate 1 moves, thereby keeping the distance between the presser foot 322 and the needle 2 in the front and back directions constant.

[0068] Please refer to Figure 4 , Figure 4 the schematic diagram of the presser foot device provided in the embodiments of the present application.

[0069] As Figure 4 shown, in some embodiments, the presser foot device 3 includes:

[0070] a mounting assembly 31;

[0071] a presser foot assembly 32 rotatably mounted on the mounting assembly 31, the presser foot assembly 32 being provided with a presser foot 322, and the distance between the presser foot 322 and the side of the fabric away from the presser foot 322 is adjusted by the rotation angle of the presser foot assembly 32 relative to the mounting assembly 31.

[0072] In the present embodiment, the design of the presser foot device 3 is highly adaptable, which includes the mounting assembly 31 and the presser foot assembly 32. The mounting assembly 31 can be fixed on the corresponding mechanism of the lockstitch machine. The presser foot assembly 32 can be rotatably mounted on the mounting assembly 31, which allows the presser foot assembly 32 to rotate relative to the mounting assembly 31, thereby adjusting the distance between the presser foot 322 and the bottom surface of the fabric. The presser foot assembly 32 directly acts on the fabric, and by adjusting the rotation angle between the presser foot assembly 32 and the mounting assembly 31, the distance between the presser foot 322 and the bottom surface of the fabric can be changed, thereby adapting to fabrics with different top surface heights, i.e., fabrics with different thicknesses.

[0073] The key advantage of this design lies in its flexibility and adjustment capability. Regardless of the thickness of the fabric, the presser foot mechanism can ensure the pressing effect of the presser foot 322 on the fabric by adjusting the position of the presser foot assembly 32. This not only improves the adaptability of the sewing process, but also ensures the sewing quality and efficiency, because the fabric can be uniformly and stably pressed, making the sewing stitches more flat and accurate. In this way, the presser foot mechanism 3 can be widely applied to different types and thicknesses of fabrics, and when the presser foot mechanism is arranged on the lockstitch machine 100, it also enhances the versatility and practicality of the lockstitch machine 100.

[0074] Please continue to refer to Figure 4 In some embodiments, the presser foot device 3 further comprises:

[0075] a pre-press assembly 33 mounted on the mounting assembly 31, the pre-press assembly 33 being connected to the presser foot assembly 32, the pre-press assembly 33 being configured to apply a pre-press force to the presser foot assembly 32 to urge the presser foot assembly 32 to rotate to press the presser foot 322 against the fabric.

[0076] In the present embodiment, the presser foot device 3 further comprises an important component, which is the pre-press assembly 33. The pre-press assembly 33 is mounted on the mounting assembly 31 and connected to the presser foot assembly 32. Its main function is to provide a pre-press force to the presser foot assembly 32, which is transmitted to the presser foot assembly 32 through the pre-press assembly 33, thereby urging the presser foot assembly 32 to rotate.

[0077] When the presser foot assembly 32 rotates, the presser foot 322 moves accordingly, achieving the pressing of the fabric. The design of this pre-press force is crucial because it ensures that the presser foot 322 is in a floating state, adapting to different situations of the fabric such as flatness and thickness, while the presser foot 322 can provide sufficient pressure to stabilize the fabric, avoiding movement or sliding of the fabric during sewing, thereby ensuring the accuracy and consistency of sewing.

[0078] It should be noted that the pre-press assembly 33 has multiple optional forms, including but not limited to passive springs, torsional springs, and other elastic and damping elements, as well as active power elements such as air cylinders and electric cylinders; its connection mode with the presser foot assembly 32 also has multiple optional forms, such as the abutting form of elastic and damping elements on the presser foot assembly 32, and the hinged form of the power end of the power element on the presser foot assembly 32, which is not limited in the present embodiment.

[0079] Please refer to Figure 5 , Figure 5 The exploded view of the presser foot device provided in the present embodiment.

[0080] As Figure 5 shown, in some embodiments, the mounting assembly 31 comprises:

[0081] a presser foot mounting base 311;

[0082] a presser foot swing arm base 312 fixedly mounted on the presser foot mounting base 311, the presser foot swing arm base 312 being provided with a rotating shaft 313, the rotating shaft 313 being provided with a sliding bearing 314, and the presser foot assembly 32 being sleeved on the sliding bearing 314.

[0083] In this embodiment, the mounting assembly 31 is the base part of the presser foot device 3, which is composed of several key components, ensuring the stable installation and flexible movement of the presser foot assembly 32. Specifically, the mounting assembly 31 includes a presser foot mounting base 311, which is the supporting foundation of the entire assembly, providing a stable installation platform for the presser foot device 3. The presser foot mounting base 311 can be fixedly installed on the corresponding mechanism of the lock eye machine through screw installation.

[0084] The presser foot swing arm seat 312 is another important component of the mounting assembly 31, which is fixedly installed on the presser foot mounting base 311. The presser foot swing arm seat 312 can be fixedly installed on the presser foot mounting base 311 through screw installation. The presser foot swing arm seat 312 is provided with a rotating shaft 313, which is the key to connecting and supporting the presser foot assembly 32. The rotating shaft 313 is sleeved with a sliding bearing 314, which allows the presser foot assembly 32 to rotate freely on the rotating shaft 313, while reducing friction and wear, improving the operating efficiency and service life of the entire presser foot device.

[0085] The presser foot assembly 32 is sleeved on the sliding bearing 314, which means that the presser foot assembly 32 can rotate flexibly on the presser foot swing arm seat 312, thereby realizing the position adjustment for the thickness of the fabric. Through this design, the presser foot assembly 32 can be adjusted according to the thickness and characteristics of the fabric during the sewing process, ensuring that the fabric always maintains an appropriate pressing state during the sewing process.

[0086] Overall, the design of the mounting assembly 31 not only provides the stability required by the presser foot device 3, but also allows the presser foot assembly 32 to make necessary adjustments to adapt to different sewing needs, thereby improving the flexibility and adaptability of the sewing process.

[0087] Please continue to refer to Figure 5 In some embodiments, the pre-pressing assembly 33 includes:

[0088] The torsion spring shaft 331 is fixedly installed on the presser foot swing arm seat 312.

[0089] The torsion spring 332 is fixedly installed on the torsion spring shaft 331, and the extended end of the torsion spring 332 abuts against the presser foot assembly 32.

[0090] In this embodiment, the pre-pressing assembly 33 is a key part of the presser foot device 3, which ensures that the presser foot assembly 32 can stably press the fabric by providing a pre-pressing force. The pre-pressing assembly 33 is mainly composed of the torsion spring shaft 331 and the torsion spring 332.

[0091] The torsion spring shaft 331 is a fixed part of the pre-pressing assembly 33, which is fixedly installed on the presser arm base 312. This installation mode ensures the stability of the torsion spring shaft 331, providing a solid support point for the torsion spring 332. The torsion spring 332 is fixedly installed around the torsion spring shaft 331, and its design allows it to freely stretch and compress on the torsion spring shaft 331.

[0092] The extended end of the torsion spring 332 abuts the presser foot assembly 32, and in this way, the force of the torsion spring 332 can be directly transmitted to the presser foot assembly 32. The initial installation state of the torsion spring 332 is compressed. When the torsion spring 332 is compressed, it generates an outward force, which is transmitted to the presser foot assembly 32 through the extended end of the torsion spring 332, pushing the presser foot assembly 32 to rotate, thereby controlling the presser foot 322 to press the fabric.

[0093] This design allows the presser foot assembly 32 to provide appropriate pressure as needed to adapt to different thicknesses of fabric. The pre-pressing force of the torsion spring 332 can be adjusted according to the actual needs during the sewing process, ensuring that the fabric remains stable during the sewing process and reducing sewing quality problems caused by fabric movement or sliding. Through the design of the pre-pressing assembly 33, the presser foot device 3 can achieve more flexible and precise fabric pressing control, improving the quality and efficiency of sewing.

[0094] Please continue to refer to Figure 5 In some embodiments, the presser foot assembly 32 includes a presser arm 321 that is rotatably installed on the presser arm base 312. The presser foot 322 is rotatably installed on the presser arm 321.

[0095] In this embodiment, the design of the presser foot assembly 32 is further refined, especially the installation method of the presser arm 321 and the presser foot 322. The presser arm 321 is the core component of the presser foot assembly 32, which can be rotatably installed on the presser arm base 312 to adapt to different thicknesses of fabric. At the same time, the presser foot 322 is rotatably installed on the presser arm 321, so that it can automatically adjust to fit the fabric when the fabric is uneven.

[0096] There are two possible implementations of the installation method of the presser foot 322: one is that the presser foot 322 is rotatably installed on the presser arm 321, and the other is that the presser foot 322 is fixedly installed on the presser arm 321. These two installation methods provide different flexibility and adaptability.

[0097] Optionally, the presser foot 322 is rotatably installed on the presser arm 321 through the shaft position screw 323.

[0098] Please refer to Figure 6 , Figure 6 The schematic diagram of the presser foot assembly provided for another embodiment of the present application.

[0099] In some embodiments, the presser foot assembly 32 includes a presser foot swing arm 321 pivotally mounted to a presser foot swing arm base 312. The presser foot 322 is fixedly mounted to the presser foot swing arm 321.

[0100] In this embodiment, the presser foot 322 is fixedly mounted to the presser foot swing arm 321. This design simplifies the structure of the presser foot assembly 32, reduces the relative movement between components, and thus reduces wear and maintenance requirements. The fixedly mounted presser foot 322 is suitable for sewing tasks where the fabric thickness varies little or the pressing force requirement is relatively constant.

[0101] Alternatively, the presser foot 322 is integrally formed with the presser foot swing arm 321.

[0102] In some embodiments, the presser foot swing arm 321 is provided with a clamping groove 3211 that abuts the extended end of the torsion spring 332.

[0103] In this embodiment, the design of the presser foot swing arm 321 particularly includes a key feature, the clamping groove 3211. This clamping groove 3211 is a groove on the presser foot swing arm 321 that directly abuts the extended end of the torsion spring 332. Through this design, the force of the torsion spring 332 can be directly transmitted to the presser foot swing arm 321, thereby driving the rotation of the presser foot swing arm 321 and its related components.

[0104] The presence of the clamping groove 3211 not only provides a stable connection point, but also ensures that the force of the torsion spring 332 can be effectively transmitted to the presser foot swing arm 321, thereby affecting the overall movement of the presser foot assembly 32. This design allows the presser foot assembly 32 to be properly adjusted according to the pre-pressure of the torsion spring 332, to adapt to different thicknesses of fabric while ensuring the pressing action on the fabric.

[0105] When the torsion spring 332 is compressed or stretched, its force is transmitted to the presser foot swing arm 321 through the clamping groove 3211, prompting the presser foot swing arm 321 to rotate. This rotation in turn causes the distance between the presser foot 322 and the bottom surface of the fabric to change, achieving dynamic pressing of the fabric. The design of the clamping groove 3211 ensures that this force transmission is both direct and effective, thereby improving the response speed and adjustment accuracy of the presser foot assembly 32.

[0106] Optionally, the line connecting the abutting position of the torsion spring 332 and the clamping groove 3211, and the rotation position of the presser foot swing arm 321 is the first line, and the line connecting the pressing position of the presser foot 322 and the fabric, and the rotation position of the presser foot swing arm 321 is the second line, and the included angle between the first line and the second line is an obtuse angle. This angle design helps to optimize the force transmission path, so that the presser foot 322 can press the fabric more stably and uniformly.

[0107] In some embodiments, the presser foot swing arm 321 is provided with a limiting arm 3212 that limits the rotation angle of the presser foot assembly 32 relative to the mounting assembly 31 by contacting the presser foot swing arm base 312.

[0108] In this embodiment, the design of the presser foot swing arm 321 further enhances its functionality and stability, achieved by introducing the limiting arm 3212. The limiting arm 3212 is an integral part of the presser foot swing arm 321, and its main function is to limit the rotation angle of the presser foot assembly 32 relative to the mounting assembly 31.

[0109] Specifically, the limiting arm 3212 achieves its limiting function by contacting the presser foot swing arm base 312. This contact can be direct physical contact or indirect restriction through other mechanical structures. The design of the limiting arm 3212 ensures that the presser foot assembly 32 does not exceed the predetermined angle range when rotating, thereby ensuring that the pressing force of the presser foot 322 on the fabric is within a controllable range.

[0110] When the limiting arm 3212 contacts the presser foot swing arm base 312, the limiting arm 3212 is in a high position, the presser foot 322 is in a low position, and the distance between the presser foot 322 and the bottom surface of the fabric is the minimum distance. At this time, the torsion spring 332 exerts force on the presser foot swing arm 321, and the presser foot swing arm 321 is maintained in this position.

[0111] Please continue to refer to Figure 5 and Figure 6 In some embodiments, the presser foot 322 is provided with a flat plate structure 3221, which is located on one side of the needle 2.

[0112] In this embodiment, the design of the presser foot 322 emphasizes its efficiency and effectiveness in contacting the fabric. The presser foot 322 is equipped with a flat plate structure 3221, which is located on one side of the needle 2 and its bottom surface directly contacts the top surface of the fabric. This design makes the flat plate structure 3221 a key part of directly pressing the fabric, ensuring that the fabric remains stable during sewing, reducing movement and sliding.

[0113] The contact between the bottom surface of the flat plate structure 3221 and the fabric not only provides the necessary pressing force, but also helps maintain the flatness of the fabric, which is crucial for ensuring the uniformity and accuracy of the sewing line. In addition to the flat plate structure 3221, the presser foot 322 can also include other additional structures that serve as connections to firmly connect the flat plate structure 3221 to the presser foot swing arm 321.

[0114] Please refer to Figure 7 , Figure 7 The schematic diagram of the presser foot provided for another embodiment of the present application.

[0115] In some embodiments, the presser foot 322 is provided with a flat plate structure 3221, and the flat plate structure 3221 is provided with a needle slot 3222, and the needle 2 passes through the needle slot 3222.

[0116] In this embodiment, the flat plate structure 3221 is further provided with the needle slot 3222, which can be regarded as the flat plate structure 3221 surrounding the needle 2, and the opening of the needle slot 3222 can avoid the needle 2 in the front-back direction. This flat plate structure 3221 provides a kind of not completely surrounding type of pressing effect, compared with the single-sided pressing mode of the flat plate structure 3221 located on one side of the needle 2, the not completely surrounding type of pressing mode allows the presser foot 322 to apply pressure to the cloth in different positions, increases the diversity of the pressing position, improves the pressing effect, can more effectively control the movement of the cloth in the sewing process, can reduce the tension of the cloth in the sewing process, ensures the accuracy of the sewing line and the overall quality of the sewing product.

[0117] Please refer to Figure 8 , Figure 8 The installation diagram of the presser foot plate and the presser foot device provided in the embodiment of the application.

[0118] In some embodiments, the presser foot plate 1 is installed on the first mounting mechanism 4 of the lock eye machine 100, and the first mounting mechanism 4 is used to control the movement and pressing of the presser foot plate 1; the presser foot device 3 is installed on the second mounting mechanism 5 of the lock eye machine 100, and the second mounting mechanism 5 is used to control the pressing of the presser foot 322.

[0119] In this embodiment, the presser foot plate 1 and the presser foot device 3 are respectively installed on different mechanisms of the lock eye machine 100, so the movements of the presser foot plate 1 and the presser foot device 3 are different. The core function of the first mounting mechanism 4 is to control the movement and pressing of the presser foot plate 1, and this control capability enables the presser foot plate 1 to dynamically adjust the position and adjust the pressure according to the actual needs in the sewing process, so as to adapt to cloth of different thicknesses and characteristics.

[0120] The second mounting mechanism 5 is different from the first mounting mechanism 4, and the second mounting mechanism 5 only controls the pressing action of the presser foot device 3, and the presser foot device 3 can be pressed to facilitate the placing and taking of the cloth. Compared with the presser foot plate 1, the presser foot device 3 does not move back and forth with the presser foot plate 1, so the presser foot 322 maintains a certain distance from the needle 2 in the front-back direction of the feeding, and does not move away from or close to the needle 2 with the movement of the cloth, plays a role of pressing the cloth, prevents the cloth from moving upward with the needle 2, makes the needle loop formed by the needle 2 stable, and reduces the needle skipping and thread breaking.

[0121] Please refer to Figure 9 , Figure 9 The schematic diagram of the pulley bracket, the pulley and the track frame provided in the embodiment of the application.

[0122] In some embodiments, the first mounting mechanism 4 comprises:

[0123] a moving arm 41;

[0124] a track frame 42 fixedly mounted on the moving arm 41, the track frame 42 being provided with a sliding groove 421, and the presser plate 1 being mounted on the track frame 42;

[0125] the second mounting mechanism 5 comprises:

[0126] a mounting rod 51;

[0127] a pulley bracket 52 fixedly mounted on the mounting rod 51, the presser device 3 being mounted on the pulley bracket 52, and the pulley bracket 52 being rotatably mounted with a pulley 53, the pulley 53 moving along the sliding groove 421 to realize the movement and pressing of the presser plate 1 controlled by the first mounting mechanism 4 and the pressing of the presser piece 322 controlled by the second mounting mechanism 5.

[0128] In the embodiment, the first mounting mechanism 4 is composed of the moving arm 41 and the track frame 42. The moving arm 41 is capable of moving in the front-back and up-down directions, which enables the presser plate 1 to realize the movement and pressing. The track frame 42 is fixedly mounted on the moving arm 41, and is provided with the sliding groove 421, and the presser plate 1 is mounted on the track frame 42. Through the movement of the moving arm 41, the track frame 42 can drive the presser plate 1 to move and press.

[0129] The second mounting mechanism 5 is composed of the mounting rod 51, the pulley bracket 52 and the pulley 53. The mounting rod 51 is circumferentially limited on the lock eye machine 100 and can only move up and down. The pulley bracket 52 is fixedly mounted on the mounting rod 51, and the pulley 53 is rotatably mounted on the pulley bracket 52. The pulley 53 moves along the sliding groove 421 of the track frame 42. This design enables the second mounting mechanism 5 to only control the pressing of the presser piece 322 when the first mounting mechanism 4 controls the movement and pressing of the presser plate 1, avoiding the front-back movement of the presser piece 322.

[0130] Through this design, the first mounting mechanism 4 and the second mounting mechanism 5 are linked in movement, enabling the presser device 3 and the presser plate 1 to be linked, for the presser device 3, the pressing is reserved and the movement is avoided, so that the presser piece 322 maintains a certain distance from the needle 2 in the front-back direction of feeding.

[0131] The application also provides a lock eye machine 100 comprising the above-mentioned presser mechanism 3.

[0132] The lock eye machine 100 is a type of industrial sewing machine, which belongs to a special machine and is mainly used for processing the buttonholes of buttons in various garments. The lock eye machine 100 also comprises other mechanisms necessary for conventional lock eye machines 100, such as a machine body, a base and the like. The lock eye machine 100 should have all the beneficial effects of the above-mentioned presser mechanism 3, which will not be repeated here.

[0133] It should be noted that many components mentioned in the present application are general standard components or components known to those skilled in the art, the structure and principle of which can be known by the skilled person through technical manual or through conventional experimental method.

[0134] It should be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between the entities.

[0135] The above has carried on the detailed introduction to the presser foot mechanism and the keyhole machine provided by the present application. The principle and implementation mode of the present application are described by applying specific examples in this paper, and the above example description is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled person in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A presser foot mechanism comprising a presser foot plate having a central portion cut away, the central portion of the presser foot plate passing over a needle, characterized in that, The presser foot mechanism further comprises a presser foot device provided with a presser foot, the presser foot is located in the presser foot plate and is spaced apart from the needle, and the presser foot is used to press the fabric in the presser foot plate.

2. The presser foot mechanism according to claim 1, characterized in that The presser foot device comprises: a mounting assembly; a presser foot assembly rotatably mounted on the mounting assembly, the presser foot assembly is provided with the presser foot, and the distance between the presser foot and the side of the fabric away from the presser foot is adjusted by the rotation angle of the presser foot assembly relative to the mounting assembly.

3. The presser foot mechanism according to claim 1, wherein The presser foot device further comprises: a pre-pressing assembly mounted on the mounting assembly, the pre-pressing assembly is connected with the presser foot assembly, and the pre-pressing assembly is used to apply a pre-pressing force to the presser foot assembly to drive the presser foot assembly to rotate so as to press the fabric.

4. The presser foot mechanism according to claim 2, wherein The mounting assembly comprises: a presser foot mounting base; a presser foot swing arm seat fixedly mounted on the presser foot mounting base, the presser foot swing arm seat is provided with a rotating shaft, the rotating shaft is sleeved with a sliding bearing, and the presser foot assembly is sleeved with the sliding bearing.

5. The presser foot mechanism according to claim 3, wherein The mounting assembly comprises a presser foot swing arm seat on which the presser foot assembly is rotatably mounted; the pre-pressing assembly comprises: a torsion spring shaft fixedly mounted on the presser foot swing arm seat; a torsion spring fixedly mounted on the torsion spring shaft, and the extended end of the torsion spring abuts against the presser foot assembly.

6. The presser foot mechanism according to claim 2, wherein The mounting assembly comprises a presser foot swing arm seat; the presser foot assembly comprises a presser foot swing arm, and the presser foot swing arm is rotatably mounted on the presser foot swing arm seat; wherein the presser foot is rotatably mounted on the presser foot swing arm, or the presser foot is fixedly mounted on the presser foot swing arm.

7. The presser foot mechanism according to claim 6, wherein The presser foot device further comprises a torsion spring used to drive the presser foot swing arm to rotate so as to press the fabric, the presser foot swing arm is provided with a clamping groove, the clamping groove abuts against the extended end of the torsion spring; and / or, the presser foot swing arm is provided with a limiting arm, the limiting arm limits the rotation angle of the presser foot assembly relative to the mounting assembly by contacting the presser foot swing arm seat.

8. The presser foot mechanism according to claim 1, wherein The presser foot is provided with a flat plate structure, and the flat plate structure is located on the side of the needle; or the presser foot is provided with a flat plate structure, and the flat plate structure has a needle slot through which the needle passes.

9. The presser foot mechanism according to claim 1, wherein The presser foot plate is mounted on a first mounting mechanism of the lock eye machine, the first mounting mechanism is used to control the movement and pressing of the presser foot plate; the presser foot device is mounted on a second mounting mechanism of the lock eye machine, and the second mounting mechanism is used to control the pressing of the presser foot; wherein the first mounting mechanism comprises: a moving arm; a track frame fixedly mounted on the moving arm, the track frame is provided with a sliding groove, and the presser foot plate is mounted on the track frame; the second mounting mechanism comprises: a mounting rod; a pulley support fixedly mounted on the mounting rod, the presser foot device is mounted on the pulley support, the pulley support is rotatably mounted with a pulley, and the pulley moves along the sliding groove, so that when the first mounting mechanism controls the movement and pressing of the presser foot plate, the second mounting mechanism controls the pressing of the presser foot.

10. A keyhole machine characterized by The presser foot mechanism comprises any one of claims 1 to 9.

Images