Presser foot curved needle mechanism and sewing machine with same

Abstract

The utility model relates to a presser foot curved needle mechanism and a sewing machine with the presser foot curved needle mechanism, the presser foot curved needle mechanism comprises a presser foot assembly and a curved needle assembly, the presser foot assembly and the curved needle assembly are provided with mutually matched axial linkage structures, and the curved needle assembly is rotatably matched with the presser foot assembly. According to the technical scheme, the problem that in the prior art, the presser foot assembly interferes with the curved needle assembly during lifting is effectively solved.

Description

Technical Field

[0001] This application relates to the technical field of sewing machines, and more specifically, to a presser foot looper mechanism and a sewing machine having the same. Background Technology

[0002] The three-needle five-thread sewing machine is a professional piece of equipment widely used in the garment and footwear sewing industries. It can simultaneously complete the sewing work with three needles and threads, offering advantages such as high sewing speed, strong stitches, and a smooth finish. It is particularly suitable for applications requiring high-strength sewing, such as the production of jeans, sportswear, and leather goods. However, with the continuous development of sewing technology and the increasing demands for product quality, existing three-needle five-thread sewing machines have gradually revealed some problems that urgently need to be addressed in practical use.

[0003] Some existing three-needle five-thread sewing machines have significant defects in the motion control of the presser foot and looper. For example, a three-needle coverstitch machine with application number 95236177.9 is prone to interference with the looper when the presser foot is in a high position, causing the looper to get stuck and malfunction. This interference not only affects sewing efficiency but can also lead to thread breakage, reduced sewing quality, and even damage to critical components such as the looper and presser foot. Utility Model Content

[0004] This application provides a presser foot looper mechanism and a sewing machine having the same, to solve the problem of interference between the presser foot assembly and the looper assembly when the presser foot assembly is lifted in the prior art.

[0005] According to the present application, a presser foot bending needle mechanism includes a presser foot assembly and a bending needle assembly. The presser foot assembly and the bending needle assembly have an axial linkage structure that cooperates with each other, and the bending needle assembly is rotatably engaged with the presser foot assembly.

[0006] Furthermore, the presser foot assembly includes a mounting structure and a presser foot structure, the presser foot structure being mounted on the mounting structure, and the bending needle assembly being rotatably mounted on the mounting structure.

[0007] Furthermore, the mounting structure includes a mounting base and a mounting shaft, and the pressure foot structure includes a pressure foot, with the mounting shaft mounted on the mounting base and the pressure foot mounted on the mounting shaft.

[0008] Furthermore, the bending needle assembly includes a first sleeve, a crankshaft structure, and a bending needle structure. The first sleeve is connected to the mounting structure, the crankshaft structure passes through the first sleeve, and the bending needle structure is connected to the crankshaft structure.

[0009] Furthermore, the crankshaft structure includes a first drive shaft, a connecting part, and a second drive shaft. The bent needle structure is connected to the first end of the first drive shaft, the first end of the connecting part is connected to the second end of the first drive shaft, and the first end of the second drive shaft is connected to the second end of the connecting part. The first drive shaft and the second drive shaft are located on both sides of the connecting part, respectively.

[0010] Furthermore, the bending needle assembly also includes a drive linkage that engages with a second drive shaft.

[0011] Furthermore, the drive linkage includes a second sleeve, a connecting rod, and a third sleeve. The second sleeve and the third sleeve are respectively connected to the two ends of the connecting rod. The axis of the second sleeve and the axis of the third sleeve are perpendicular to each other. The second sleeve is sleeved on the second drive shaft.

[0012] Furthermore, the presser foot bending mechanism also includes a wire guide assembly, which is mounted on the presser foot assembly.

[0013] According to another aspect of this application, a sewing machine is also provided, which includes a sewing machine body and a presser foot looper mechanism disposed on the sewing machine body, wherein the presser foot looper mechanism is the presser foot looper mechanism described above.

[0014] Furthermore, the sewing machine body includes a fourth sleeve, and the first sleeve is movably fitted inside the fourth sleeve, the length of the fourth sleeve being less than the length of the first sleeve.

[0015] By applying the technical solution of this application, the presser foot assembly and the bending needle assembly have a mutually cooperating axial linkage structure. When the presser foot assembly moves axially, it will drive the bending needle assembly to move axially as well. This prevents interference or collision between the presser foot assembly and the bending needle assembly during axial movement. The bending needle assembly rotatably cooperates with the presser foot assembly, ensuring that the bending needle assembly operates independently and does not affect the presser foot assembly during operation. The technical solution of this application effectively solves the problem of interference between the presser foot assembly and the bending needle assembly during lifting in the prior art. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the presser foot bending needle mechanism of Embodiment 1 of this application is shown;

[0019] Figure 2 It shows Figure 1 A partial structural diagram of the presser foot bending needle mechanism;

[0020] Figure 3 It shows Figure 1 A schematic diagram of the crankshaft structure of the presser foot bending needle mechanism;

[0021] Figure 4 A schematic diagram of the installation structure of the presser foot looper mechanism of the sewing machine according to an embodiment of this application is shown;

[0022] Figure 5 It shows Figure 4 A schematic diagram of the internal structure of a sewing machine;

[0023] Figure 6 It shows Figure 4 A comparison diagram of the first and fourth sleeves.

[0024] The above figures include the following reference numerals:

[0025] 10. Presser foot assembly; 11. Mounting structure; 111. Mounting base; 112. Mounting shaft; 12. Presser foot structure; 20. Looping needle assembly; 21. First sleeve; 22. Crankshaft structure; 221. First drive shaft; 222. Connecting part; 223. Second drive shaft; 23. Looping needle structure; 24. Drive linkage; 241. Second sleeve; 242. Linkage; 243. Third sleeve; 30. Thread guide assembly; 100. Sewing machine body; 200. Fourth sleeve. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] like Figures 1 to 5 As shown, the first embodiment of the presser foot bending needle mechanism includes a presser foot assembly 10 and a bending needle assembly 20. The presser foot assembly 10 and the bending needle assembly 20 have an axial linkage structure that cooperates with each other, and the bending needle assembly 20 rotatably cooperates with the presser foot assembly 10.

[0030] In this embodiment, the presser foot assembly 10 and the bending needle assembly 20 have a mutually cooperating axial linkage structure. When the presser foot assembly 10 moves axially, it drives the bending needle assembly 20 to move axially as well. This prevents interference or collision between the presser foot assembly 10 and the bending needle assembly 20 during axial movement. The bending needle assembly 20 rotatably engages with the presser foot assembly 10, ensuring that it operates independently and does not affect the presser foot assembly 10. This embodiment effectively solves the problem of interference between the presser foot assembly and the bending needle assembly during lifting in the prior art.

[0031] It should be noted that the above-mentioned axial linkage structure includes the cooperation of multiple components mentioned below, which together form the axial linkage structure, such as the first sleeve 21, the mounting base 111, the connecting part 222, and the bent needle mounting base. The specific forces and movements are described in detail below.

[0032] like Figure 1 and Figure 2 As shown, in the technical solution of Embodiment 1, the presser foot assembly 10 includes a mounting structure 11 and a presser foot structure 12. The presser foot structure 12 is mounted on the mounting structure 11, and the bending needle assembly 20 is rotatably mounted on the mounting structure 11. The mounting structure 11 makes the installation of the presser foot structure 12 and the bending needle assembly 20 more flexible and the spatial layout more reasonable. The bending needle assembly 20 needs to rotate regularly during operation. The above structure can realize both the rotation of the bending needle assembly 20 and the axial driving effect of the presser foot structure 12 on the bending needle assembly 20.

[0033] like Figure 1 and Figure 2 As shown, in the technical solution of Embodiment 1, the mounting structure 11 includes a mounting base 111 and a mounting shaft 112, and the presser foot structure 12 includes a presser foot. The mounting shaft 112 is mounted on the mounting base 111, and the presser foot is mounted on the mounting shaft 112. The above structure is compact and rationally laid out. For ease of understanding, the vertical sewing of the needle is used as an example: the mounting base 111 is a plate-like structure, and the cross-section of the mounting shaft 112 is circular. In other embodiments, the cross-section of the mounting shaft 112 can also be other shapes, such as rectangles or irregular shapes. The mounting base 111 has openings at both ends, and the first sleeve 21 and the mounting shaft 112 are respectively installed. After installation, the openings at both ends of the mounting base 111 are tightened with bolts, thus firmly clamping the first sleeve 21 and the mounting shaft 112.

[0034] like Figures 1 to 3 As shown, in the technical solution of Embodiment 1, the bending needle assembly 20 includes a first sleeve 21, a crankshaft structure 22, and a bending needle structure 23. The first sleeve 21 is connected to the mounting structure 11, the crankshaft structure 22 passes through the first sleeve 21, and the bending needle structure 23 is connected to the crankshaft structure 22. The crankshaft structure 22 passes through the first sleeve 21, allowing the first sleeve 21 to limit and constrain the crankshaft structure in multiple directions, resulting in smoother and more precise movement of the crankshaft structure 22 and reducing the likelihood of shaft deflection. It should be noted that the upper surface of the bending needle structure 23 and the lower surface of the connecting portion 222 abut against both ends of the first sleeve, thus preventing impact when the pressure foot assembly 10 moves the bending needle assembly 20 up and down.

[0035] like Figures 1 to 3As shown, in the technical solution of Embodiment 1, the crankshaft structure 22 includes a first drive shaft 221, a connecting part 222, and a second drive shaft 223. The bent needle structure 23 is connected to the first end of the first drive shaft 221, the first end of the connecting part 222 is connected to the second end of the first drive shaft 221, and the first end of the second drive shaft 223 is connected to the second end of the connecting part 222. The first drive shaft 221 and the second drive shaft 223 are located on both sides of the connecting part 222. The above structure is compact and easy to use. It should be noted that in this embodiment, the second end of the second drive shaft 223 extends upward as a free end. Thus, when the bent needle assembly 20 moves up and down with the presser foot assembly 10, the second sleeve 241 is fitted around the circumferential outside of the second drive shaft 223, and the second drive shaft 223 can move freely up and down within the second sleeve 241. The crankshaft structure 22 is an integral structure, and the bent needle structure 23 is detachably connected to the first end of the first drive shaft 221. The bent needle structure 23 includes a bent needle and a bent needle seat. The bent needle seat has a through hole through which the first drive shaft 221 passes. One end of the bent needle seat has an opening extending from the outer edge to the through hole. The size of the through hole can be adjusted by bolts to fix the bent needle seat to the first end of the first drive shaft 221. Both ends of the first drive shaft 221 are located outside the first sleeve 21. When the first sleeve 21 applies an upward force to the connecting part 222, the bent needle structure 23 moves upward; when the first sleeve 21 applies a downward force to the bent needle structure 23, the bent needle structure 23 moves downward.

[0036] like Figures 1 to 3 As shown, in the technical solution of Embodiment 1, the bending needle assembly 20 further includes a drive linkage 24, which cooperates with the second transmission shaft 223. Specifically, the second transmission shaft 223 can move axially along the second transmission shaft 223 in cooperation with the drive linkage. This changes the problem in the traditional bending needle assembly 20 where the crankshaft structure 22 cannot move up and down when it cooperates with the drive linkage 24, thus preventing the bending needle from moving up and down and causing the presser foot assembly 10 to collide with the bending needle when it moves upward.

[0037] like Figures 1 to 3 As shown, in the technical solution of Embodiment 1, the driving connecting rod 24 includes a second sleeve 241, a connecting rod 242, and a third sleeve 243. The second sleeve 241 and the third sleeve 243 are respectively connected to both ends of the connecting rod 242. The axis of the second sleeve 241 and the axis of the third sleeve 243 are perpendicular to each other. The second sleeve 241 is sleeved on the second transmission shaft 223. The above structure is ingeniously designed, easy to assemble and disassemble, and lightweight. In this embodiment, the outer wall of the second sleeve 241 is provided with a round rod, and one end of the connecting rod 242 and the third sleeve 243 has a round rod sleeve. The round rod passes through the round rod sleeve. The above structure is easy to process and manufacture, and also easy to assemble and disassemble.

[0038] like Figure 1 and Figure 2 As shown, in the technical solution of Embodiment 1, the presser foot looper mechanism further includes a thread guide assembly 30, which is disposed on the presser foot assembly 10. The thread guide assembly 30 facilitates the guidance and constraint of the thread bundle. It should be noted that the thread guide assembly 30 is detachably fixed to the mounting shaft 112 by fasteners, so that the thread guide assembly 30 can also move up and down together with the presser foot assembly 10, thus preventing the sewing thread from becoming tangled when the presser foot assembly 10 needs to be raised.

[0039] The difference between the technical solution of Embodiment 2 and the technical solution of Embodiment 1 is that the drive linkage 24 is an integrally formed structure, for example, by casting.

[0040] like Figure 4 and Figure 5 As shown, according to another aspect of this application, a sewing machine is also provided, comprising a sewing machine body 100 and a presser foot looper mechanism disposed on the sewing machine body 100, wherein the presser foot looper mechanism is the presser foot looper mechanism described above. The sewing machine of this application can be a coverstitch sewing machine or a serger sewing machine, etc.

[0041] like Figures 4 to 6 As shown, the sewing machine body includes a fourth sleeve, and a first sleeve 21 is movably fitted inside the fourth sleeve 200. The length of the fourth sleeve 200 is less than the length of the first sleeve 21. The fourth sleeve guides, limits, and constrains the first sleeve 21, making it less prone to displacement. The specific dimension L of the fourth sleeve being smaller than the first sleeve 21 can be set as needed, and this dimension L is greater than or equal to the maximum lifting height of the presser foot.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A presser foot bending needle mechanism, characterized in that, include: Presser foot assembly (10) and bending needle assembly (20), The presser foot assembly (10) and the bending needle assembly (20) have an axial linkage structure that cooperates with each other, and the bending needle assembly (20) rotates to cooperate with the presser foot assembly (10).

2. The presser foot bending needle mechanism according to claim 1, characterized in that, The presser foot assembly (10) includes a mounting structure (11) and a presser foot structure (12), the presser foot structure (12) being mounted on the mounting structure (11), and the bent needle assembly (20) being rotatably mounted on the mounting structure (11).

3. The presser foot bending needle mechanism according to claim 2, characterized in that, The mounting structure (11) includes a mounting base (111) and a mounting shaft (112). The pressure foot structure (12) includes a pressure foot. The mounting shaft (112) is mounted on the mounting base (111), and the pressure foot is mounted on the mounting shaft (112).

4. The presser foot bending needle mechanism according to claim 2, characterized in that, The bent needle assembly (20) includes a first sleeve (21), a crankshaft structure (22) and a bent needle structure (23). The first sleeve (21) is connected to the mounting structure (11), the crankshaft structure (22) is inserted inside the first sleeve (21), and the bent needle structure (23) is connected to the crankshaft structure (22).

5. The presser foot bending needle mechanism according to claim 4, characterized in that, The crankshaft structure (22) includes a first drive shaft (221), a connecting part (222), and a second drive shaft (223). The bent needle structure (23) is connected to the first end of the first drive shaft (221), the first end of the connecting part (222) is connected to the second end of the first drive shaft (221), and the first end of the second drive shaft (223) is connected to the second end of the connecting part (222). The first drive shaft (221) and the second drive shaft (223) are located on both sides of the connecting part (222).

6. The presser foot bending needle mechanism according to claim 5, characterized in that, The bent needle assembly (20) also includes a drive link (24), which cooperates with the second transmission shaft (223).

7. The presser foot bending needle mechanism according to claim 6, characterized in that, The drive link (24) includes a second sleeve (241), a link (242) and a third sleeve (243). The second sleeve (241) and the third sleeve (243) are respectively connected to the two ends of the link (242). The axis of the second sleeve (241) and the axis of the third sleeve (243) are perpendicular to each other. The second sleeve (241) is sleeved on the second transmission shaft (223).

8. The presser foot bending needle mechanism according to claim 1, characterized in that, The presser foot bending mechanism also includes a wire guide assembly (30), which is disposed on the presser foot assembly (10).

9. A sewing machine, characterized in that, The sewing machine includes a sewing machine body and a presser foot looper mechanism disposed on the sewing machine body, wherein the presser foot looper mechanism is the presser foot looper mechanism as described in any one of claims 1 to 8.

10. The sewing machine according to claim 9, characterized in that, The sewing machine body includes a fourth sleeve, and the first sleeve (21) of the looper assembly (20) is movably sleeved on the inner side of the fourth sleeve. The length of the fourth sleeve is less than the length of the first sleeve (21).

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