Adjustable thread trimming cutter structure and sewing machine

Abstract

The utility model belongs to the technical field of sewing equipment, and particularly relates to an adjustable thread trimming cutter structure and a sewing machine. The thread trimming cutter comprises a movable cutter and a fixed cutter, the movable cutter is arranged on a movable cutter holder through a movable cutter support, the movable cutter holder comprises an upper mounting seat and a lower adjusting seat, the movable cutter support is mounted on the lower adjusting seat through a fixing shaft, one end of the fixing shaft is fixedly connected with the movable cutter support, and the fixing shaft is movably connected with the lower adjusting seat. An adjusting mechanism is arranged between the fixed shaft and the lower adjusting seat; the adjusting mechanism drives the fixed shaft to move along the axis of the fixed shaft so as to adjust the distance between the movable cutter and the fixed cutter; according to the thread trimming cutter, the movable cutter support is movably connected to the lower adjusting base, the fixed shaft capable of moving axially and the adjusting mechanism are arranged, the distance between the movable cutter and the fixed cutter is accurately adjusted, the problem that the gap of a traditional thread trimming cutter cannot be adjusted due to abrasion or assembly errors is solved, and thread trimming precision and adaptability are improved.

Description

Technical fields:

[0001] This utility model belongs to the field of sewing equipment technology, specifically referring to an adjustable thread-cutting tool structure and a sewing machine. Background technology:

[0002] Existing sewing machine thread-cutting structures consist of a moving blade and a fixed blade, with the fixed blade fixed to the base plate. To prevent the fixed blade from cutting the thread during sewing, it is generally kept at a certain distance from the needle. Driven by a transmission mechanism, the fixed blade remains stationary while the moving blade moves towards it and cuts the thread at the fixed blade. The moving blade can move in various ways, such as rotating to engage with the fixed blade for thread cutting, or lifting to engage with the fixed blade. Compared to rotary thread cutting, lifting thread cutting structures have higher requirements for the relative position between the moving and fixed blades. Inaccurate gaps, angles, or alignment between them can lead to poor thread cutting, such as thread residue, incomplete cutting, or thread jamming. However, due to manufacturing and assembly errors in sewing machine components, the initial positions of the moving and fixed blades are often difficult to match precisely, resulting in cumbersome adjustment processes and reduced production efficiency. Therefore, there is an urgent need for a thread-cutting tool structure with an adjustable positional relationship between the moving and fixed blades to optimize assembly accuracy and improve thread cutting reliability. Summary of the Invention:

[0003] The purpose of this invention is to provide an adjustable thread-cutting tool structure and sewing machine that improves thread-cutting reliability by adjusting the positional relationship between the moving blade and the fixed blade.

[0004] This utility model is implemented as follows:

[0005] One objective of this utility model is to provide an adjustable wire cutting tool structure. The wire cutting tool includes a moving blade and a fixed blade. The moving blade is mounted on a moving blade holder via a moving blade bracket. The moving blade holder includes an upper mounting base and a lower adjusting base. The moving blade bracket is mounted on the lower adjusting base via a fixed shaft. One end of the fixed shaft is fixedly connected to the moving blade bracket, and the fixed shaft and the lower adjusting base are movably connected. An adjusting mechanism is provided between the fixed shaft and the lower adjusting base. The adjusting mechanism drives the fixed shaft to move along its axis to adjust the distance between the moving blade and the fixed blade.

[0006] In the aforementioned adjustable wire cutter structure, one end of the fixed shaft is provided with a screw section, and a stepped surface is formed between the screw section and the fixed shaft. A through hole is provided on the moving blade support, and the screw section passes through the through hole and is screwed with a locking nut to achieve a fixed connection between the fixed shaft and the moving blade support.

[0007] In the aforementioned adjustable wire cutter structure, the adjustment mechanism includes a limiting member and a resetting member. The lower adjustment seat or the lower adjustment seat and the upper mounting seat are provided with a clearance groove. A limiting member is provided on the fixed shaft near the moving blade support in the clearance groove. A resetting member is provided between the limiting member and the side wall of the clearance groove at the end away from the moving blade support. An adjustment member is screwed to the end of the fixed shaft away from the moving blade support. The adjustment member drives the fixed shaft to move along its axis to adjust the distance between it and the moving blade.

[0008] In the aforementioned adjustable wire cutter structure, the lower adjustment seat is provided with circular holes and a first oblong hole spaced apart parallel to the axis of the fixed shaft. The lower adjustment seat is fixedly connected to the upper mounting seat by a first screw passing through the circular hole and by a second screw passing through the first oblong hole. The moving blade bracket is also provided with a second oblong hole. The axial screw passes through the second oblong hole and is screwed onto the lower adjustment seat. The axis of the axial screw is parallel to the fixed shaft. Adjusting the position of the second screw in the first oblong hole can drive the lower adjustment seat to rotate around the axis of the first screw, thereby driving the moving blade bracket and the moving blade to rotate around the axis of the first screw and adjusting the tilt angle between the moving blade and the fixed blade.

[0009] In the aforementioned adjustable wire cutter structure, an adjusting screw is provided on one side wall of the upper mounting base, and a limiting groove is provided on the lower adjusting base. The adjusting screw has a head that can extend into the limiting groove and abut against the inner side wall of the limiting groove, and a screw rod that is screwed to the upper mounting base. The inner side wall of the limiting groove is parallel to the axis of the fixed shaft. Rotating the adjusting screw and loosening the second screw can drive the lower adjusting base to rotate around the axis of the first screw.

[0010] In the aforementioned adjustable wire cutter structure, the moving blade support is further provided with a third oblong hole, through which a third screw passes and is fixedly connected to the moving blade. The third oblong hole allows for adjustment of the position of the moving blade on the moving blade support.

[0011] In the aforementioned adjustable wire cutter structure, the upper mounting base is provided with mounting holes for fixed connection with the lifting component, and at least two fastening screws with their inner ends pressed against the lifting component are provided on the side wall of the upper mounting base to fix the upper mounting base and the lifting component in place.

[0012] Another object of this utility model is to provide a sewing machine that includes the above-described adjustable thread cutter structure.

[0013] The outstanding advantages of this utility model compared to the prior art are:

[0014] This invention achieves precise adjustment of the gap between the moving blade and the fixed blade by movably connecting the moving blade support to the lower adjusting base and incorporating an axially movable fixed shaft and adjusting mechanism. This solves the problem of non-adjustable gap caused by wear or assembly errors in traditional wire cutting tools, thus improving cutting accuracy and adaptability. Furthermore, this invention can also adjust the tilt angle between the moving and fixed blades, resolving blade misalignment issues caused by assembly errors, ensuring complete contact between the moving and fixed blade edges, and further enhancing cutting smoothness. Attached image description:

[0015] Figure 1 This is one of the three-dimensional schematic diagrams of this utility model;

[0016] Figure 2 This is the second three-dimensional schematic diagram of this utility model;

[0017] Figure 3 This is one of the schematic diagrams of the present invention not installed on the lifting component;

[0018] Figure 4 This is the second schematic diagram of the present invention not installed on the lifting component;

[0019] Figure 5 yes Figure 3 Top view;

[0020] Figure 6 yes Figure 5 AA section view;

[0021] Figure 7 This is a schematic diagram of the tool holder support of this utility model;

[0022] Figure 8 This is a schematic diagram of the lower adjustment seat of this utility model.

[0023] In the diagram: 1. Moving tool; 2. Fixed tool; 3. Fixed tool holder; 4. Moving tool support; 5. Moving tool holder; 6. Lifting component; 7. Upper mounting base; 8. Lower adjusting base; 9. Fixed shaft; 10. Limiting component; 11. Resetting component; 12. Clearance groove; 13. Adjusting component; 14. Circular hole; 15. First oblong hole; 16. First screw; 17. Second screw; 18. Second oblong hole; 19. Shaft position screw; 20. Adjusting screw; 21. Limiting groove; 22. Third oblong hole; 23. Mounting hole. Detailed implementation method:

[0024] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —8:

[0025] One objective of this invention is to provide an adjustable wire-cutting cutter structure. The cutter includes a movable blade 1 and a fixed blade 2. The fixed blade 2 is fixed to a base plate via a fixed blade holder 3. The movable blade 1 is mounted on a movable blade support 4, and the movable blade support 4 is mounted on a movable blade seat 5. The movable blade seat 5 is fixed to a lifting member 6. Driven by a driving mechanism, the lifting member 6 moves up and down, causing the movable blade 1 to move downwards, cooperating with the fixed blade 2 to cut the wire and reset. Specifically, the movable blade seat 5 includes an upper mounting base 7 and a lower adjusting base 8, with the lower adjusting base 8 connected to the upper mounting base 7. The movable blade support 4 is connected to the lower adjusting base 8 via a fixed shaft 9. One end of the fixed shaft 9 is fixedly connected to the movable blade support 4, and the fixed shaft 9 and the lower adjusting base 8 are movably connected. The axis of the fixed shaft 9 is perpendicular to the movable blade support 4, allowing for some error. Furthermore, the fixed shaft 9 can be moved along its axis on the lower adjusting base 8 via an adjusting mechanism to adjust the distance between the movable blade 1 and the fixed blade 2.

[0026] This invention achieves precise adjustment of the gap between the moving blade 1 and the fixed blade 2 by movably connecting the moving blade bracket 4 to the lower adjusting seat 8 and setting an axially movable fixed shaft 9 and an adjusting mechanism. This solves the problem of the gap being unadjustable due to wear or assembly errors in traditional wire cutting tools, and improves the wire cutting accuracy and adaptability.

[0027] The fixed shaft 9 has a threaded section at one end, forming a stepped surface between the threaded section and the fixed shaft 9. A through hole is provided on the moving tool support 4, through which the threaded section passes and is screwed with a locking nut to achieve a fixed connection between the fixed shaft 9 and the moving tool support 4. The design of the stepped surface and the locking nut ensures axial positioning accuracy and prevents the fixed shaft 9 from shifting during adjustment.

[0028] Furthermore, the adjustment mechanism includes a limiting member 10 and a resetting member 11. Specifically, the limiting member 10 can be a retaining ring or a snap ring, and the resetting member 11 is a spring. The resetting member 11 provides reverse pressure to prevent loosening after adjustment and improve stability. The lower adjusting seat 8, or both the lower adjusting seat 8 and the upper mounting seat 7, are provided with clearance grooves 12. A limiting member 10 is provided on the fixed shaft 9 near the moving tool support 4 within the clearance groove 12. A resetting member 11 is provided between the limiting member 10 and the side wall of the clearance groove away from the moving tool support 4. The two ends of the resetting member 11 are pressed against the limiting member 10 and the corresponding side wall of the clearance groove 12, driving the fixed shaft 9 to always push towards the moving tool support 4. An adjusting member 13 is screwed to the end of the fixed shaft 9 away from the moving tool support 4. In this embodiment, the adjusting member 13 is an adjusting screw. A threaded hole is provided on the fixed shaft 9, and the adjusting member 13 passes through the lower adjusting seat 8 and is screwed into the threaded hole. Rotating the adjusting component 13 adjusts the depth of its screw-in connection within the threaded hole, thereby driving the fixed shaft 9 to move along its axis and adjust the distance between the fixed tool 2 and the moving tool 1. The combination of the limiting component 10 and the reset component 11 provides an automatic reset function. The adjusting component 13 achieves fine-tuning by axially pushing the fixed shaft 9, making the spacing adjustment more stable and self-locking. The adjusting component 13 can be an adjusting knob or adjusting screw, etc.

[0029] Furthermore, this utility model also features adjustable angle between the moving blade 1 and the fixed blade 2, ensuring that the moving blade 1 cooperates with the fixed blade 2 to achieve the purpose of cutting the thread when it moves downward. The lower adjusting seat 8 has a circular hole 14 and a first oblong hole 15 parallel to the axis of the fixed shaft 9. The lower adjusting seat 8 is fixedly connected to the upper mounting seat 7 via a first screw 16 passing through the circular hole 14 and a second screw 17 passing through the first oblong hole 15. The moving blade support 4 also has a second oblong hole 18, through which a shaft screw 19 is screwed onto the lower adjusting seat 8. The axis of the shaft screw 19 is parallel to the fixed shaft 9. Adjusting the position of the second screw 17 within the first oblong hole 15 drives the lower adjusting seat 8 to rotate around the axis of the first screw 16, thereby causing the moving blade support 4 and the moving blade 1 to rotate around the axis of the first screw 16. The long axes of the first oblong hole 15 and the second oblong hole 18 are parallel. The second oblong hole 18 provides space for adjustment of the lower adjusting seat 8. By adjusting the tilt angle, the problem of blade misalignment caused by assembly errors can be solved, ensuring that the moving blade and the fixed blade are fully aligned, thus improving the smoothness of wire cutting.

[0030] For easy adjustment, the present invention provides an adjusting screw 20 on one side wall of the upper mounting base 7 and a limiting groove 21 on the lower adjusting base 8 along the front-back direction. The adjusting screw 20 has a head that can extend into the limiting groove 21 and abut against the inner side wall of the limiting groove 21 and a screw rod that is screwed to the upper mounting base 7. By rotating the adjusting screw 20 and loosening the second screw 17, the length of the screw rod of the adjusting screw 20 screwed into the corresponding threaded hole in the upper mounting base 7 changes, thereby causing the head of the adjusting screw 20 to abut against the inner or outer side wall of the limiting groove 21, driving the lower adjusting base 8 to rotate around the axis of the first screw.

[0031] This invention also includes a third oblong hole 22 on the moving blade support 4. A third screw passes through the third oblong hole 22 and is fixedly connected to the moving blade 1. The third oblong hole 22 allows adjustment of the position of the moving blade on the moving blade support. In this embodiment, the long axis of the third oblong hole 22 is arranged laterally, further expanding the adjustable range of the moving blade 1 position, adapting to different wire materials or cutting needs, and enhancing structural versatility. Simultaneously, a fourth oblong hole with its long axis arranged longitudinally can be provided on the fixed blade 2 for adjusting its vertical position.

[0032] In practical use, the upper mounting base 7 of this utility model is provided with mounting holes 23 for fixed connection with the lifting component 6. In this embodiment, the mounting holes 23 are square holes, and the corresponding lifting component 6 is square column-shaped, such as a lifting guide rail. If the lifting component 6 is a cylindrical guide rod, then the mounting holes 23 are circular holes. At least two fastening screws are provided on the side wall of the upper mounting base 7, with their inner ends pressed against the lifting component 6 to fix the upper mounting base 7 and the lifting component 6. The multi-screw tightening design prevents loosening and ensures the stability of the overall structure during the shearing process.

[0033] Another object of this utility model is to provide a sewing machine that includes the above-described adjustable thread cutter structure.

[0034] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made to the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. An adjustable thread trimming tool structure, said thread trimming tool comprising a moving blade (1) and a fixed blade (2), characterized in that: The moving blade (1) is mounted on the moving blade holder (5) via the moving blade bracket (4). The moving blade holder (5) includes an upper mounting base (7) and a lower adjusting base (8). The moving blade bracket (4) is mounted on the lower adjusting base (8) via a fixed shaft (9). One end of the fixed shaft (9) is fixedly connected to the moving blade bracket (4). The fixed shaft (9) and the lower adjusting base (8) are movably connected. An adjusting mechanism is provided between the fixed shaft (9) and the lower adjusting base (8). The adjusting mechanism drives the fixed shaft (9) to move along its axis to adjust the distance between the moving blade (1) and the fixed blade (2).

2. The adjustable thread trimming tool structure according to claim 1, wherein: One end of the fixed shaft (9) is provided with a screw part, and a stepped surface is formed between the screw part and the fixed shaft (9). A through hole is provided on the moving tool bracket (4), and the screw part passes through the through hole and is screwed with a locking nut to realize the fixed connection between the fixed shaft (9) and the moving tool bracket (4).

3. The adjustable thread trimming tool according to claim 1, wherein: The adjustment mechanism includes a limiting member (10) and a resetting member (11). The lower adjustment seat (8) or the lower adjustment seat (8) and the upper mounting seat (7) are provided with a relief groove (12). The limiting member (10) is provided on the fixed shaft (9) near the moving knife support (4) in the relief groove (12). The resetting member (11) is provided between the limiting member (10) and the side wall of the relief groove (12) away from the moving knife support (4). An adjustment member (13) is screwed to the end of the fixed shaft (9) away from the moving knife support (4). The adjustment member (13) drives the fixed shaft (9) to move along its axis to adjust the distance between it and the moving knife (1).

4. An adjustable thread trimming tool structure according to claim 1 or 2 or 3, wherein: The lower adjusting seat (8) is provided with a circular hole (14) and a first oblong hole (15) at intervals parallel to the axis of the fixed shaft (9). The lower adjusting seat (8) is fixedly connected to the upper mounting seat (7) through the circular hole (14) by the first screw (16) and through the first oblong hole (15) by the second screw (17). The moving knife support (4) is also provided with a second oblong hole (18). The shaft screw (19) is screwed onto the lower adjusting seat (8) through the second oblong hole (18). The axis of the shaft screw (19) is parallel to the fixed shaft (9). By adjusting the position of the second screw (17) in the first oblong hole (15), the lower adjusting seat (8) can be driven to rotate around the axis of the first screw (16), thereby driving the moving knife support (4) and the moving knife (1) to rotate around the axis of the first screw (16) to adjust the tilt angle between the moving knife (1) and the fixed knife (2).

5. The adjustable thread trimming tool structure according to claim 4, wherein: An adjusting screw (20) is provided on one side wall of the upper mounting base (7), and a limiting groove (21) is provided on the lower adjusting base (8). The adjusting screw (20) has a head that can extend into the limiting groove (21) and abut against the inner side wall of the limiting groove (21), and a screw rod that is screwed to the upper mounting base (7). The inner side wall of the limiting groove (21) is parallel to the axis of the fixed shaft (9). By rotating the adjusting screw (20) and loosening the second screw (17), the lower adjusting base (8) can be driven to rotate around the axis of the first screw (16).

6. An adjustable thread trimming tool structure according to claim 1 or 2 or 3, wherein: The moving knife support (4) is also provided with a third oblong hole (22), and a third screw passes through the third oblong hole (22) and is fixedly connected to the moving knife (1). The setting of the third oblong hole (22) can adjust the position of the moving knife (1) on the moving knife support (4).

7. An adjustable thread trimming tool structure according to claim 1 or 2 or 3, wherein: The upper mounting base (7) is provided with mounting holes (23) for fixed connection with the lifting component (6), and at least two fastening screws are provided on the side wall of the upper mounting base (7) to fix the upper mounting base (7) and the lifting component (6) by pressing the inner end against the lifting component (6).

8. A sewing machine characterized by: Includes the adjustable wire cutting tool structure as described in any one of claims 1-7.

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