Sewing machine presser foot

Abstract

The utility model belongs to sewing machine accessory technical field, especially point to a sewing machine presser foot, including presser foot handle and presser foot bottom plate, the front end of presser foot bottom plate is the upturned end, the lower extreme of presser foot handle is connected with presser foot bottom plate rotation, be provided with elastic piece between presser foot handle and presser foot bottom plate, so that when presser foot is in natural state, the included angle between presser foot handle and the plane of presser foot bottom plate is 65 DEG -85 DEG, the utility model discloses can according to the real -time change of the thickness of the sewing material and carry out dynamic pitch swing, thereby always keep and the adaptive fit of the sewing material surface.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewing machine accessories, and specifically refers to a sewing machine presser foot. Background Technology

[0002] The presser foot is an essential component of the sewing machine's feeding mechanism. It primarily applies pressure to the surface of the fabric to ensure smooth feeding and even stitches. There are many types of presser feet available; the appropriate presser foot can be selected based on the sewing needs.

[0003] Traditional presser foot structures consist of a presser foot handle and a presser foot base plate. The upper end of the presser foot handle connects to the presser bar, and the planes on the presser foot handle and the presser foot base plate are nearly perpendicular, resulting in very little room for rotation between them. In actual work, when the fabric being sewn suddenly thickens or thins, the presser foot cannot adapt to the change in the angle of the fabric surface, causing the presser foot base plate to be partially suspended. This disrupts the pressure balance, leading to problems such as poor fabric feeding, poor stitches, and even skipped stitches and thread breaks, severely restricting sewing quality and efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a presser foot for a sewing machine that can adapt to changes in fabric thickness, maintain stable pressure, and ensure smooth feeding.

[0005] This utility model is implemented as follows: A sewing machine presser foot includes a presser foot handle and a presser foot base plate. The front end of the presser foot base plate is an upturned end. The lower end of the presser foot handle is rotatably connected to the presser foot base plate. An elastic element is provided between the presser foot handle and the presser foot base plate, so that when the presser foot is in its natural state, the included angle between the plane where the presser foot handle and the presser foot base plate are located is 65°-85°.

[0006] In the above-mentioned sewing machine presser foot, the lower rear edge of the presser foot base plate is provided with a rounded corner, the radius of which is 4±1mm.

[0007] In the above-mentioned sewing machine presser foot, there is also a presser plate independent of the presser foot base plate. The presser plate is rotatably disposed at the rear end of the presser foot base plate, and a reset member is provided between the presser plate and the presser foot base plate to always make the presser plate have a downward rotation tendency.

[0008] In the sewing machine presser foot described above, the bottom surface of the rear end of the presser plate is provided with a material discharge slope.

[0009] In the above-mentioned sewing machine presser foot, a pivot seat is provided at the rear end of the presser foot base plate, and a pivot is provided on the pivot seat. One end of the pressure plate is rotatably mounted on the pivot. The reset element is a torsion spring, which is fitted on the pivot. One end of the torsion spring rests against the presser foot base plate, and the other end rests against the pressure plate.

[0010] In the above-mentioned sewing machine presser foot, a first finger guard is provided on the presser foot base plate, and the first finger guard extends backward from the presser foot base plate to the top of the presser plate.

[0011] In the above-mentioned sewing machine presser foot, a second finger guard is provided on the presser foot base plate, and the second finger guard extends forward from the presser foot base plate to above the upturned end of the presser foot base plate.

[0012] In the above-mentioned sewing machine presser foot, the elastic element is a spring, and the two ends of the spring abut against the presser foot base plate and the presser foot handle, respectively.

[0013] In the above-mentioned sewing machine presser foot, the presser foot base plate and the presser foot handle are respectively provided with a first spring hole and a second spring hole, and the two ends of the spring are respectively disposed in the first spring hole and the second spring hole.

[0014] The outstanding advantages of this utility model compared to the prior art are: 1. This invention can dynamically tilt and swing according to the real-time changes in fabric thickness, thus maintaining an adaptive fit with the fabric surface at all times. It fundamentally solves the problem of localized suspension of the presser foot when the fabric thickness changes abruptly, effectively preventing quality defects such as skipped stitches and broken threads. It also ensures a smooth feeding process and uniform stitches, significantly improving the sewing machine's adaptability to fabrics of different thicknesses and enhancing sewing quality.

[0015] 2. The pressure plate of this utility model effectively prevents the fabric from twisting, curling, or shifting due to the cutting action of the gantry cutter.

[0016] 3. The second finger guard of this utility model can effectively prevent the operator's fingers from being pricked by the machine needle, thus improving the safety of the equipment.

[0017] 4. The first finger guard of this utility model can prevent the operator's fingers from being injured by the gantry chopper, further improving the safety factor. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the presser foot in its natural state in Example 1.

[0019] Figure 2 yes Figure 1 Top view.

[0020] Figure 3 yes Figure 2 AA sectional view.

[0021] Figure 4 This is one of the three-dimensional schematic diagrams of the presser foot in use in Embodiment 2.

[0022] Figure 5This is the second three-dimensional schematic diagram of the presser foot in use in Example 2.

[0023] In the diagram: 1. Presser foot handle; 2. Presser foot base plate; 3. Upward-curving end; 4. Elastic element; 5. First spring hole; 6. Second spring hole; 7. Rounded corner; 8. Second finger guard; 9. Pressure plate; 10. Reset element; 11. Discharge slope; 12. Rotary shaft seat; 13. Rotary shaft; 14. First finger guard. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments. Example 1: See Figure 1-3 : This embodiment provides a sewing machine presser foot, which includes a presser foot handle 1 and a presser foot base plate 2. The front end of the presser foot base plate 2 is an upturned end 3. The lower end of the presser foot handle 1 is rotatably connected to the presser foot base plate 2. An elastic element 4 is provided between the presser foot handle 1 and the presser foot base plate 2, so that when the presser foot is in its natural state, the included angle α between the planes of the presser foot handle 1 and the presser foot base plate 2 is 65°–85°. The specific included angle can be any value within the above range.

[0025] In actual use, the presser foot handle 1 is connected to the presser bar and is in a vertical position. Under the action of the elastic element 4, the rear end of the presser foot base plate 2 is subjected to downward pressure, so that the upturned end 3 at its front end is pressed tightly against the needle plate or sewing material surface with a certain pressure.

[0026] When the fabric thickness increases, such as when the fabric suddenly becomes thicker or when it needs to cross a thicker section (e.g., the seam between multiple layers), the thickened portion pushes up the front end of the presser foot plate 2 from bottom to top. At this time, the presser foot plate 2 overcomes the torque of the elastic element 4 and rotates clockwise (viewed from the sewing direction) around its rotational connection point with the presser foot handle 1. This rotation causes the front end of the presser foot plate 2 to adaptively rise, thus smoothly "climbing" over the thickened obstacle. During this process, the elastic element 4 is further compressed, storing energy, but the vertical downward pressure transmitted through the presser foot handle 1 is still maintained, ensuring that the feed teeth can always effectively grip and push the fabric.

[0027] Conversely, when the fabric becomes thinner, under the restoring torque of the elastic element 4, the presser foot plate 2 will rotate counterclockwise, causing its front end to press down quickly and re-fit tightly against the thinner fabric surface, effectively preventing problems such as skipped stitches and floating threads caused by the front end of the presser foot plate 2 being suspended in the air.

[0028] In summary, the sewing machine presser foot provided in this embodiment can dynamically pitch and swing according to real-time changes in fabric thickness, thus maintaining an adaptive fit with the fabric surface at all times. This fundamentally solves the problem of localized suspension that occurs with traditional presser feet when fabric thickness changes abruptly. It not only effectively prevents quality defects such as skipped stitches and broken threads, but also ensures a smooth feeding process and uniform stitches, significantly improving the sewing machine's adaptability to fabrics of different thicknesses and enhancing sewing quality.

[0029] It should be noted that the elastic element 4 is a spring, with its two ends abutting against the presser foot base plate 2 and the presser foot handle 1, respectively. Alternatively, the elastic element 4 can also be a spring sheet.

[0030] Furthermore, the presser foot base plate 2 and the presser foot handle 1 are respectively provided with a first spring hole 5 and a second spring hole 6, and the two ends of the spring are respectively set in the first spring hole 5 and the second spring hole 6, which effectively avoids the spring from shifting or falling off under long-term vibration, and ensures the durability and reliability of the presser foot's self-adaptive function.

[0031] Furthermore, the lower rear edge of the presser foot base plate 2 is provided with a rounded corner 7, the radius of which is 4±1mm. Preferably, the radius of the rounded corner 7 is 4mm. Providing the rounded corner 7 facilitates the smooth flow of the sewing material into the lower part of the presser foot base plate 2, reducing feeding resistance.

[0032] Furthermore, this invention can also provide a second finger guard 8 on the presser foot base plate 2, the second finger guard 8 extending forward from the presser foot base plate 2 to above the upturned end 3 of the presser foot base plate 2. The second finger guard 8 can effectively prevent the operator's fingers from being pricked by the machine needle, improving the safety of the equipment.

[0033] Example 2: See Figure 4-5 : This embodiment has a basically the same structure as Embodiment 1, the difference being: This embodiment also includes a pressure plate 9 independent of the presser foot base plate 2. The pressure plate 9 is rotatably disposed at the rear end of the presser foot base plate 2, and a reset member 10 is provided between the pressure plate 9 and the presser foot base plate 2 to always ensure that the pressure plate 9 has a downward rotation tendency. This embodiment is mainly applied to sewing machines with a gantry awl cutting device. Its working process is as follows: During the entire cutting process of the gantry awl, the front presser foot base plate 2 continues to press the main sewing material area to ensure the stability of the feeding system; the rear pressure plate 9 independently and continuously presses the end of the sewing material, effectively preventing the sewing material from twisting, curling, or overall displacement caused by the cutting action.

[0034] Furthermore, the bottom surface of the rear end of the pressure plate 2 is provided with a discharge slope 11 to ensure that the sewing material leaves smoothly and prevents it from getting caught.

[0035] Specifically, the connection structure between the pressure plate 9 and the pressure foot base plate 2 is as follows: a pivot seat 12 is provided at the rear end of the pressure foot base plate 2, and a pivot 13 is provided on the pivot seat 12. One end of the pressure plate 9 is rotatably mounted on the pivot 13. The reset member 10 is a torsion spring, which is fitted on the pivot. One end of the torsion spring abuts against the pressure foot base plate 2, and the other end abuts against the pressure plate 9, thereby providing a continuous downward torque to the pressure plate 9.

[0036] Furthermore, a first finger guard 14 is provided on the presser foot base plate 2, extending rearward from the presser foot base plate 2 to above the presser plate 9. The first finger guard 14 can prevent the operator's fingers from being injured by the gantry chopper, further improving the safety factor.

[0037] 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 in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A sewing machine presser foot, comprising a presser foot handle (1) and a presser foot base plate (2), wherein the front end of the presser foot base plate (2) is an upturned end (3), and the lower end of the presser foot handle (1) is rotatably connected to the presser foot base plate (2), characterized in that: An elastic element (4) is provided between the presser foot handle (1) and the presser foot base plate (2), so that when the presser foot is in its natural state, the included angle between the plane where the presser foot handle (1) and the presser foot base plate (2) are located is 65°-85°.

2. A sewing machine presser foot according to claim 1, characterized in that: The lower rear edge of the presser foot base plate (2) is provided with a rounded corner (7), the radius of which is 4±1mm.

3. A presser foot according to claim 1, characterized in that: It also includes a pressure plate (9) independent of the pressure foot base plate (2), the pressure plate (9) being rotatably disposed at the rear end of the pressure foot base plate (2), and a reset member (10) being disposed between the pressure plate (9) and the pressure foot base plate (2) to always make the pressure plate (9) have a downward rotation tendency.

4. A sewing machine presser foot according to claim 3, characterized in that: The bottom surface of the rear end of the pressure plate (9) is provided with a discharge slope (11).

5. A sewing machine presser foot according to claim 3, characterized in that: The rear end of the presser foot base plate (2) is provided with a pivot seat (12), and a pivot (13) is provided on the pivot seat (12). One end of the pressure plate (9) is rotatably mounted on the pivot (13). The reset member (10) is a torsion spring. The torsion spring is fitted on the pivot. One end of the torsion spring abuts against the presser foot base plate (2), and the other end abuts against the pressure plate (9).

6. A sewing machine presser foot according to claim 3, 4, or 5, characterized in that: The presser foot base plate (2) is provided with a first finger guard (8), which extends backward from the presser foot base plate (2) to the top of the presser plate (9).

7. A sewing machine presser foot according to claim 1, 2, 3, or 4, characterized in that: A second finger guard (14) is provided on the presser foot base plate (2), and the second finger guard (14) extends forward from the presser foot base plate (2) to the top of the upturned end (3) of the presser foot base plate (2).

8. A sewing machine presser foot according to claim 1, characterized in that: The elastic element (4) is a spring, with its two ends abutting against the presser foot base plate (2) and the presser foot handle (1), respectively.

9. A sewing machine presser foot according to claim 8, characterized in that: The presser foot base plate (2) and presser foot handle (1) are respectively provided with a first spring hole (5) and a second spring hole (6), and the two ends of the spring are respectively located in the first spring hole (5) and the second spring hole (6).

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