Needle bar oil-proof structure and sewing machine thereof

Abstract

The utility model relates to the technical field of sewing machines, in particular to a needle bar oil-proof structure and a sewing machine with the needle bar oil-proof structure. The needle bar oil-proof structure is applied to the sewing machine and comprises a machine shell, a needle bar assembly and an oil seal seat, the needle bar assembly is connected with the machine shell, the oil seal seat is detachably connected to the machine shell or the needle bar assembly, an oil seal is detachably connected to the oil seal seat, and the needle bar assembly is arranged in the oil seal in a penetrating mode and can axially move relative to the oil seal seat. Therefore, due to the fact that the oil seal seat is detachably connected with the machine shell or the needle rod assembly, the oil seal and the oil seal seat can be detached together, when the oil seal needs to be replaced, the oil seal seat enables installation of the oil seal to be simpler and more standard, special tools are not needed for disassembly and assembly, installation difficulty is reduced, downtime is shortened, and maintenance cost is reduced. In addition, the oil seal seat provides an additional protection layer for the oil seal, the possibility that external impurities (such as dust and particulate matter) enter a sealing area is reduced, and the oil seal is prevented from being damaged too early.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and in particular to an oil-proof needle bar structure and a sewing machine thereof. Background Technology

[0002] During the sewing process, the needle bar of a sewing machine moves at high speed and repeatedly, which can easily cause wear due to repeated friction with other structures. Therefore, it is necessary to apply lubricating oil to the needle bar for lubrication. However, during the sewing process, the lubricating oil can also seep through the gaps in the structure and contaminate the sewing material.

[0003] To address this issue and prevent oil contamination, existing needle bars are typically equipped with oil seals. These seals scrape lubricating oil off the needle bar and leave it in the oil chamber, where it is then drawn back into the oil cylinder by the oil pump through the suction nozzle and return pipe. However, most existing oil seals rely on their own elasticity to be fixed to the housing. Due to the influence of the installation position and angle, disassembly and assembly are inconvenient, and the disassembly process can easily damage the oil seal. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a needle bar oil-proof structure.

[0005] An oil-proof needle bar structure for use in a sewing machine includes: a machine housing; a needle bar assembly connected to the machine housing; and an oil seal seat detachably connected to the machine housing or the needle bar assembly, wherein an oil seal is detachably connected to the oil seal seat; wherein the needle bar assembly passes through the oil seal and is axially movable relative to the oil seal seat.

[0006] This design allows for the detachable connection between the oil seal seat and the housing or needle bar assembly, enabling the oil seal and seat to be removed together. When oil seal replacement is needed, the oil seal seat simplifies and standardizes installation, eliminating the need for specific tools and reducing installation difficulty, downtime, and maintenance costs. Furthermore, the oil seal seat provides an additional protective layer, reducing the likelihood of external impurities (such as dust and particles) entering the sealing area and preventing premature oil seal damage.

[0007] In one embodiment, the oil seal seat includes an operating part and a connecting part. The connecting part is connected to one side of the operating part, and the connecting part is hollow and cooperates with the operating part to form a mounting groove.

[0008] In one embodiment, the housing is configured with a receiving groove, at least a portion of the connecting portion is located in and connected to the receiving groove, and the operating portion is located outside the receiving groove.

[0009] In one embodiment, the accommodating groove has an internal thread on its wall and the connecting part has an external thread on its outer peripheral wall, and the connecting part is threadedly connected to the accommodating groove.

[0010] In one embodiment, along the axial direction of the oil seal seat, the cross-section of the connecting portion is set to an annular shape, and the cross-section of the operating portion is set to a polygonal structure.

[0011] In one embodiment, the needle bar assembly includes a needle bar and a sleeve, the sleeve being fitted onto the outer periphery of the needle bar, and the inner wall of the connecting portion being threadedly connected to the outer periphery of the sleeve.

[0012] In one embodiment, an oil return hole is provided on the side wall of the connecting part. The oil return hole penetrates the side wall of the connecting part in the radial direction. One end of the oil return hole is connected to the mounting groove, and the other end is connected to an external oil pump.

[0013] In one embodiment, the housing is configured with a receiving groove, the oil seal seat is disposed on the opening of the receiving groove and is fixedly connected to the housing, and the oil seal is disposed in the receiving groove.

[0014] In one embodiment, the needle bar oil-proof structure further includes a sealing ring disposed between the oil seal and the groove wall of the receiving groove, and having an interference fit with the oil seal and the groove wall of the receiving groove.

[0015] This utility model also provides a sewing machine, including the oil-proof needle bar structure described above.

[0016] Compared to existing technologies, this invention adds a detachable oil seal seat. Because the oil seal seat is detachably connected to the housing or needle bar assembly, the oil seal and oil seal seat can be removed together. When the oil seal needs to be replaced, the oil seal seat simplifies and standardizes the installation process, eliminating the need for specific tools and reducing installation difficulty, downtime, and maintenance costs. Furthermore, the oil seal seat provides an additional protective layer for the oil seal, reducing the possibility of external impurities (such as dust and particles) entering the sealing area and preventing premature damage to the oil seal. Attached Figure Description

[0017] Figure 1 A perspective view of a first embodiment of the sewing machine provided by this utility model;

[0018] Figure 2 A cross-sectional view of a first embodiment of the sewing machine provided by this utility model;

[0019] Figure 3 for Figure 2 Enlarged view of section A in the image;

[0020] Figure 4 This is a schematic diagram of a first embodiment of the needle bar oil-proof structure provided by this utility model;

[0021] Figure 5 A schematic diagram of the structure of the oil seal seat and oil seal provided in Embodiment 1 of this utility model;

[0022] Figure 6 A schematic diagram of the structure of the oil seal seat and oil seal provided in Embodiment 2 of this utility model;

[0023] Figure 7 A cross-sectional view of a second embodiment of the oil seal seat and oil seal provided by this utility model;

[0024] Figure 8 A schematic diagram of the structure of the oil seal seat and oil seal provided in Embodiment 3 of this utility model;

[0025] Figure 9 This is a schematic diagram of the structure of a third embodiment of the sewing machine provided by this utility model.

[0026] The symbols in the diagram represent the following meanings:

[0027] 100. Needle bar oil-proof structure; 200. Sewing machine; 10. Machine housing; 11. Receiving groove; 20. Needle bar assembly; 21. Needle bar; 22. Sleeve; 30. Oil seal seat; 31. Operating part; 32. Connecting part; 321. Oil return hole; 33. Mounting groove; 34. Connecting piece; 40. Oil seal; 50. Sealing ring. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it can be directly on the other mechanism or there may be an intervening mechanism. When a mechanism is considered to be "connected to" another mechanism, it can be directly connected to the other mechanism or there may be an intervening mechanism. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0033] Please see Figures 1-9 This utility model provides a needle bar oil-proof structure 100, in which the oil seal 40 is detachably connected to the housing 10 or the needle bar assembly 20 via the oil seal seat 30, so as to facilitate later disassembly and maintenance.

[0034] The needle bar oil-proof structure 100 is used in a sewing machine 200 and includes a machine housing 10, a needle bar assembly 20, and an oil seal seat 30. The needle bar assembly 20 is connected to the machine housing 10, and the oil seal seat 30 is detachably connected to either the machine housing 10 or the needle bar assembly 20. An oil seal 40 is detachably connected to the oil seal seat 30, and the needle bar assembly 20 passes through the oil seal 40 and can move axially relative to the oil seal seat 30. Because the oil seal seat 30 is detachably connected to either the machine housing 10 or the needle bar assembly 20, the oil seal 40 and the oil seal seat 30 can be removed together. When the oil seal 40 needs to be replaced, the oil seal seat 30 simplifies and standardizes its installation, eliminating the need for specific tools and reducing installation difficulty, downtime, and maintenance costs. Furthermore, the oil seal seat 30 provides an additional protective layer for the oil seal 40, reducing the possibility of external impurities (such as dust and particles) entering the sealing area and preventing premature damage to the oil seal 40.

[0035] There are multiple embodiments of the detachable connection between the oil seal seat 30 and the oil seal 40, which are described in detail here:

[0036] Example 1

[0037] Please see Figures 1-5 In this first embodiment, the oil seal seat 30 includes an operating part 31 and a connecting part 32. The connecting part 32 is connected to one side of the operating part 31 and is hollow, forming a mounting groove 33 with the operating part 31. The side of the operating part 31 near the connecting part 32 serves as the bottom of the mounting groove 33, and the inner wall of the hollow connecting part 32 serves as the wall of the mounting groove 33. The mounting groove 33 serves as the mounting space for the oil seal 40 and is detachably connected to the oil seal 40.

[0038] Of course, it is understandable that in other embodiments, the oil seal seat 30 may also have a mounting groove 33 directly formed instead of being formed by the connecting part 32 and the operating part 31.

[0039] Furthermore, the housing 10 is configured with a receiving groove 11, at least a portion of the connecting part 32 is located in and connected to the receiving groove 11, and the operating part 31 is located outside the receiving groove 11. Therefore, the connecting part 32 is convenient to connect to the housing 10, and the operating part 31 is located outside the receiving groove 11, making it convenient for the user to operate the operating part 31 to quickly disassemble the oil seal seat 30.

[0040] Preferably, in this embodiment, the connecting part 32 is completely in the receiving groove 11, and the side of the operating part 31 near the connecting part 32 abuts against the side of the housing 10 where the receiving groove 11 is provided, so as to further limit the position.

[0041] In this embodiment, the accommodating groove 11 has an internal thread on its groove wall, and the connecting part 32 has an external thread on its outer peripheral wall. The connecting part 32 is threadedly connected to the accommodating groove 11. Thus, the user can rotate the connecting part 32 by turning the operating part 31. The connecting part 32 can be connected to or disconnected from the groove wall of the accommodating groove 11 with just a simple rotation. The structure is simple and the operation is convenient.

[0042] Furthermore, along the axial direction of the oil seal seat 30, the cross-section of the connecting part 32 is set as an annular shape, and the cross-section of the operating part 31 is set as a polygonal structure. In this way, the annular connecting part 32 is adapted to a threaded fit, and the outer periphery of the polygonal operating part 31 has multiple planes to facilitate the force applied by the user's hand.

[0043] For example, the polygon can be set as a quadrilateral, pentagon, hexagon, heptagon, or octagon, etc., as long as it is convenient for users to operate.

[0044] Example 2

[0045] Please see Figures 6-7 In this second embodiment, the needle bar assembly 20 includes a needle bar 21 and a sleeve 22. The sleeve 22 is fitted onto the outer periphery of the needle bar 21, and the inner side of the connecting portion 32 is threadedly connected to the outer periphery of the sleeve 22. Thus, the oil seal seat 30 is connected to the needle bar assembly 20, and quick assembly and disassembly are achieved through the threaded connection. The difference from the first embodiment is that in the first embodiment, the oil seal seat 30 is threaded to the receiving groove 11 on the housing 10 by having external threads on the outer periphery of the connecting portion 32. In this embodiment, the oil seal seat 30 is threaded to the external threads on the outer periphery of the sleeve 22 by having internal threads on the inner wall of the connecting portion 32.

[0046] Furthermore, an oil return hole 321 is provided on the side wall of the connecting part 32. The oil return hole 321 penetrates the side wall of the connecting part 32 along the radial direction of the connecting part 32. One end of the oil return hole 321 communicates with the mounting groove 33, and the other end communicates with the external oil pump. In this way, during the reciprocating motion of the pinhole assembly, after the lubricating oil is scraped off by the oil seal 40, it can return to the oil pump through the oil return hole 321.

[0047] Optionally, multiple oil return holes 321 may be provided on the side wall of the connecting part 32 to improve the oil return efficiency.

[0048] Example 3

[0049] Please see Figures 8-9 The third embodiment is similar to the first embodiment in that it also has a receiving groove 11, the oil seal seat 30 is placed over the opening of the receiving groove 11 and is fixedly connected to the housing 10, and the oil seal 40 is disposed in the receiving groove 11. In this way, the oil seal seat 30 is connected to the housing 10 and its position is fixed, thereby confining the oil seal 40 within the receiving groove 11.

[0050] Compared to Embodiment 1 and Embodiment 2, the oil seal seat 30 in Embodiment 3 is located outside the receiving groove 11, and the connection and assembly of the oil seal seat 30 is simpler and more direct.

[0051] In this embodiment, the oil seal seat 30 is connected to the housing 10 via two connectors 34. Exemplarily, the oil seal seat 30 has a through hole, and the housing 10 also has a corresponding connecting hole. The connectors 34 pass through the through hole and extend into the connecting hole to achieve connection. The connectors 34 are configured as screws, bolts, or other similar connectors.

[0052] Furthermore, the needle bar oil-proof structure 100 also includes a sealing ring 50, which is disposed between the oil seal 40 and the groove wall of the receiving groove 11, and is interference-fitted with the oil seal 40 and the groove wall of the receiving groove 11. In this way, the sealing ring 50 can further limit the oil seal 40, making the position of the oil seal 40 stable, and improving the sealing performance to prevent oil leakage.

[0053] The sealing ring 50 is made of an elastic material such as rubber, which can fill gaps and provide a limiting effect.

[0054] This utility model also provides a sewing machine 200, including the needle bar oil-proof structure 100 as described above.

[0055] Compared to existing technologies, this invention adds a detachable oil seal seat 30. Since the oil seal seat 30 is detachably connected to the housing 10 or the needle bar assembly 20, the oil seal 40 and the oil seal seat 30 can be removed together. When the oil seal 40 needs to be replaced, the oil seal seat 30 simplifies and standardizes its installation, eliminating the need for specific tools and reducing installation difficulty, downtime, and maintenance costs. Furthermore, the oil seal seat 30 provides an additional protective layer for the oil seal 40, reducing the possibility of external impurities (such as dust and particles) entering the sealing area and preventing premature damage to the oil seal 40.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An oil-proof needle bar structure for use in sewing machines, characterized in that, include; Casing (10); The needle bar assembly (20) is connected to the housing (10); An oil seal seat (30) is detachably connected to the housing (10) or the needle bar assembly (20), and an oil seal (40) is detachably connected to the oil seal seat (30); The needle bar assembly (20) is inserted into the oil seal (40) and is axially movable relative to the oil seal seat (30).

2. The needle bar oil-proof structure according to claim 1, characterized in that, The oil seal seat (30) includes an operating part (31) and a connecting part (32). The connecting part (32) is connected to one side of the operating part (31), and the connecting part (32) is hollow and cooperates with the operating part (31) to form a mounting groove (33).

3. The needle bar oil-proof structure according to claim 2, characterized in that, The housing (10) is configured with a receiving groove (11), at least a portion of the connecting part (32) is located in the receiving groove (11) and connected to the receiving groove (11), and the operating part (31) is located outside the receiving groove (11).

4. The needle bar oil-proof structure according to claim 3, characterized in that, The accommodating groove (11) has an internal thread on its groove wall, and the connecting part (32) has an external thread on its outer peripheral wall. The connecting part (32) is threadedly connected to the accommodating groove (11).

5. The needle bar oil-proof structure according to claim 3 or 4, characterized in that, Along the axial direction of the oil seal seat (30), the cross-section of the connecting part (32) is set as an annular shape, and the cross-section of the operating part (31) is set as a polygonal structure.

6. The needle bar oil-proof structure according to claim 2, characterized in that, The needle bar assembly (20) includes a needle bar (21) and a sleeve (22). The sleeve (22) is sleeved on the outer periphery of the needle bar (21), and the inner wall of the connecting part (32) is threadedly connected to the outer periphery of the sleeve (22).

7. The needle bar oil-proof structure according to claim 6, characterized in that, The connecting part (32) has an oil return hole (321) on its side wall. The oil return hole (321) passes through the side wall of the connecting part (32) in the radial direction. One end of the oil return hole (321) is connected to the mounting groove (33), and the other end is connected to an external oil pump.

8. The needle bar oil-proof structure according to claim 1, characterized in that, The housing (10) is constructed with a receiving groove (11), the oil seal seat (30) is covered on the opening of the receiving groove (11) and fixedly connected to the housing (10), and the oil seal (40) is disposed in the receiving groove (11).

9. The needle bar oil-proof structure according to claim 8, characterized in that, The needle bar oil-proof structure also includes a sealing ring (50), which is disposed between the oil seal (40) and the groove wall of the receiving groove (11) and is interference-fitted with the oil seal (40) and the groove wall of the receiving groove (11).

10. A sewing machine, characterized in that, Including the needle bar oil-proof structure as described in any one of claims 1-9.

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