A sewing machine presser foot assembly

Abstract

The utility model relates to sewing machine accessory technical field, especially a sewing machine presser foot subassembly, including presser foot handle, be provided with low pressure foot and high pressure foot on the presser foot handle, the top of presser foot handle is provided with the mounting groove, the inside movable joint of mounting groove has the mounting rod, still include connecting assembly and pressurization subassembly, connecting assembly is used for installing the mounting rod in the mounting groove, pressurization subassembly is used for adjusting the pressure of high pressure foot, the utility model discloses through pressurization subassembly, through the rotation of the handle and drive the rotation of the rotating lever, thereby make cam rotate extrude high pressure foot to change its pressure to the sewing material, adapt to the sewing material of different material and thickness, simultaneously through connecting assembly, through the pulling of the sleeve finger block makes the slide rod drive rectangular plate and rectangular block separate, after putting in the mounting rod, the sleeve finger block is loosened, the second spring lets the slide rod reset, rectangular block inserts rectangular plate and the slide rod passes through the through groove and completes the fixation, and the operation is simple and quick, improves work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine accessories technology, and in particular to a sewing machine presser foot assembly. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to create one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. The presser foot is an important component of a sewing machine. During the sewing process, the presser foot is used to press the fabric firmly and, in conjunction with the feed mechanism, to transport the fabric forward, ensuring smooth sewing.

[0003] Existing presser foot assemblies mostly rely on springs for pressure adjustment, which makes it difficult to accurately adapt to different materials and thicknesses of fabrics. For lightweight fabrics such as silk and chiffon, the elastic pressure of the springs is prone to fluctuations, causing the fabric to wrinkle, deform, or even leave obvious indentations on the fabric surface, severely damaging the overall aesthetics of the sewn fabric. At the same time, unstable elastic pressure may also cause the fabric to be excessively stretched during transport, resulting in uneven thread tension and overly dense or loose stitches, greatly affecting the sewing quality. Utility Model Content

[0004] The purpose of this invention is to solve the problem that the existing technology of presser feet relying solely on springs to adjust pressure is difficult to accurately adapt to sewing materials of different materials and thicknesses, and to propose a sewing machine presser foot assembly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sewing machine presser foot assembly includes a presser foot handle, on which a low presser foot and a high presser foot are provided. A mounting groove is formed on the top of the presser foot handle, and a mounting rod is movably connected inside the mounting groove.

[0007] Also includes:

[0008] A connecting assembly for mounting a mounting rod within a mounting slot;

[0009] A pressurizing assembly for adjusting the pressure of the high-pressure foot;

[0010] The pressurizing assembly includes a rotating rod, a first spring, a cam, a threaded groove, a rotating handle, and a threaded cap. The rotating rod is rotatably connected inside the presser foot handle and is rotatably connected to the high-pressure foot.

[0011] The first spring is symmetrically and fixedly connected to the top surface of the low pressure foot, the first spring is fixedly connected to the pressure foot handle, and the cam is fixedly connected to the rotating rod;

[0012] The threaded groove is formed on the rotating rod, and the rotating handle is fixedly connected to the top of the rotating rod;

[0013] The threaded cap is fixedly connected to the side wall of the presser foot handle, and the threaded groove is threadedly connected to the threaded cap.

[0014] Preferably, the connecting assembly includes a through groove, a slide rod, a sleeve finger block, a rectangular plate, a rectangular block, and a second spring. The through groove is formed on the mounting rod, the slide rod is symmetrically slidably connected to the inner wall of the mounting groove, and the slide rod is slidably connected to the presser foot handle.

[0015] Preferably, the finger-shaped block is symmetrically fixedly connected to the top end of the slide rod, the rectangular plate is fixedly connected to the end of one of the slide rods, and the rectangular block is fixedly connected to the end of the other slide rod.

[0016] Preferably, the rectangular block is inserted into the rectangular plate.

[0017] Preferably, there are two second springs, one end of each second spring is fixedly connected to the side wall of the mounting groove, and the other end of each second spring is fixedly connected to the side wall of the rectangular plate and the rectangular block, respectively.

[0018] Preferably, the bottom of the low-pressure foot is provided with multiple circular protrusions.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. This utility model uses a pressure component to rotate the rotating rod by rotating the handle, thereby causing the cam to rotate and squeeze the high-pressure foot to change its pressure on the sewing material. The threaded cap and threaded groove cooperate to achieve self-locking of the rotating rod, so that the high-pressure foot can be adapted to sewing materials of different materials and thicknesses, ensuring sewing quality and avoiding problems such as wrinkling and slippage of the sewing material.

[0021] 2. This utility model uses a connecting component. By pulling the sleeve finger block, the slide rod is driven to separate the rectangular plate and the rectangular block. After the mounting rod is inserted, the sleeve finger block is released, and the second spring resets the slide rod. The rectangular block is inserted into the rectangular plate, and the slide rod passes through the through groove to complete the fixation. Then, by pulling the sleeve finger block, the slide rod is disengaged from the through groove. The operation is simple and quick, improving work efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a sewing machine presser foot assembly proposed in this utility model;

[0023] Figure 2 This is a cross-sectional view of the presser foot handle of a sewing machine presser foot assembly proposed in this utility model.

[0024] Figure 3This is a schematic diagram of the connection structure between the connecting component and the mounting rod of a sewing machine presser foot assembly proposed in this utility model;

[0025] Figure 4 This is a schematic diagram of the connection structure between the rotating rod and the threaded cap of a sewing machine presser foot assembly proposed in this utility model.

[0026] In the diagram: 1. Presser foot handle; 11. Mounting slot; 2. Low-pressure foot; 3. High-pressure foot; 31. Rotating rod; 32. First spring; 33. Cam; 34. Threaded groove; 35. Rotating handle; 36. Threaded cap; 4. Mounting rod; 41. Through groove; 42. Slide rod; 43. Finger sleeve block; 44. Rectangular plate; 45. Rectangular block; 46. Second spring. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Reference Figure 1 - Figure 4 A sewing machine presser foot assembly includes a presser foot handle 1, on which a low presser foot 2 and a high presser foot 3 are mounted. The bottom of the low presser foot 2 has multiple circular protrusions that effectively enhance friction with the fabric, further improving stability during sewing. The top of the presser foot handle 1 has a mounting groove 11, and cavities are formed on both sides of the inner wall of the mounting groove 11. The diameter of these cavities is larger than the diameters of the rectangular plate 44 and the rectangular block 45, preventing them from being unable to separate or reset smoothly due to restricted movement, and ensuring smooth operation when the slide rod 42 drives the rectangular plate 44 and the rectangular block 45.

[0029] The mounting slot 11 has a movable connection to the mounting rod 4. The bottom of the mounting rod 4 is rectangular, which facilitates the connection between the mounting rod 4 and the presser foot handle 1. By installing the mounting rod 4 on the sewing machine, the presser foot can be quickly disassembled and replaced through the connecting assembly.

[0030] A sewing machine presser foot assembly further includes a connecting assembly and a pressure assembly. The connecting assembly is used to install the mounting rod 4 in the mounting groove 11. The connecting assembly includes a through groove 41, a sliding rod 42, a finger block 43, a rectangular plate 44, a rectangular block 45, and a second spring 46. The through groove 41 is opened on the mounting rod 4. The sliding rod 42 is symmetrically slidably connected to the inner wall of the mounting groove 11. The sliding rod 42 is slidably connected to the presser foot handle 1. The finger block 43 is symmetrically fixedly connected to the top end of the sliding rod 42. The rectangular plate 44 is fixedly connected to the end of one of the sliding rods 42. The rectangular block 45 is fixedly connected to the end of the other sliding rod 42. The rectangular block 45 is inserted into the rectangular plate 44. The inner wall of the rectangular plate 44 has a rectangular groove that matches the rectangular block 45. This fit not only guides the rectangular block 45 to be smoothly inserted into the rectangular plate 44, but also forms an effective limit after the two are connected to prevent relative shaking.

[0031] Two second springs 46 are provided. One end of each second spring 46 is fixedly connected to the side wall of the mounting groove 11, and the other end of each second spring 46 is fixedly connected to the side wall of the rectangular plate 44 and the rectangular block 45, respectively.

[0032] The pressure adjustment assembly is used to adjust the pressure of the high-pressure foot 3. The pressure adjustment assembly includes a rotating rod 31, a first spring 32, a cam 33, a threaded groove 34, a rotating handle 35, and a threaded cap 36. The rotating rod 31 is rotatably connected inside the pressure foot handle 1 and is rotatably connected to the high-pressure foot 3. The first spring 32 is symmetrically fixedly connected to the top surface of the low-pressure foot 2 and is fixedly connected to the pressure foot handle 1. The cam 33 is fixedly connected to the rotating rod 31. The threaded groove 34 is formed on the rotating rod 31. The rotating handle 35 is fixedly connected to the top of the rotating rod 31. The threaded cap 36 is fixedly connected to the side wall of the pressure foot handle 1. The threaded groove 34 and the threaded cap 36 are threadedly connected. The threaded cap 36 has an external thread that mates with the threaded groove 34. Because the threaded cap 36 is fixedly connected to the pressure foot handle 1, when the rotating rod 31 rotates, the threaded groove 34 rotates independently only inside the threaded cap 36 and will not drive the threaded cap 36 to rotate synchronously. Moreover, the threaded engagement can achieve a self-locking function for the rotating rod 31.

[0033] The functional principle of this utility model can be explained through the following operation methods:

[0034] First, when installing the presser foot, pull the sleeve finger block 43 to separate the slide rod 42 from the rectangular plate 44 and the rectangular block 45. After placing the mounting rod 4 into the mounting groove 11, release the sleeve finger block 43. The second spring 46 drives the slide rod 42 to return to its original position. The rectangular block 45 is inserted into the rectangular plate 44 and the slide rod 42 passes through the through groove 41, thus completing the fixing of the mounting rod 4. When disassembling the presser foot, pull the sleeve finger block 43 to disengage the slide rod 42 from the through groove 41 to remove the mounting rod 4.

[0035] When adjusting the pressure of the low pressure foot 2, the rotating handle 35 is turned, and the rotating rod 31 rotates inside the threaded cap 36 and the threaded groove 34, which drives the cam 33 to rotate and squeeze the high pressure foot 3, changing its pressure on the sewing material. After the work is completed, the rotating rod 31 is turned again to make the cam 33 return to the initial position. At this time, the first spring 32 drives the low pressure foot 2 to reset, thus adapting to the needs of different sewing materials.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sewing machine presser foot assembly, comprising a presser foot handle (1), characterized in that, The presser foot handle (1) is provided with a low presser foot (2) and a high presser foot (3). The top of the presser foot handle (1) is provided with a mounting groove (11), and a mounting rod (4) is movably connected inside the mounting groove (11). Also includes: A connecting assembly for mounting the mounting rod (4) in the mounting slot (11); A pressurizing assembly for adjusting the pressure of the high-pressure foot (3); The pressurizing assembly includes a rotating rod (31), a first spring (32), a cam (33), a threaded groove (34), a rotating handle (35), and a threaded cap (36). The rotating rod (31) is rotatably connected inside the presser foot handle (1), and the rotating rod (31) is rotatably connected to the high pressure foot (3). The first spring (32) is symmetrically fixedly connected to the top surface of the low pressure foot (2), the first spring (32) is fixedly connected to the pressure foot handle (1), and the cam (33) is fixedly connected to the rotating rod (31); The threaded groove (34) is formed on the rotating rod (31), and the rotating handle (35) is fixedly connected to the top of the rotating rod (31); The threaded cap (36) is fixedly connected to the side wall of the presser foot handle (1), and the threaded groove (34) is threadedly connected to the threaded cap (36).

2. The sewing machine presser foot assembly according to claim 1, characterized in that, The connecting assembly includes a through groove (41), a slide rod (42), a sleeve finger block (43), a rectangular plate (44), a rectangular block (45), and a second spring (46). The through groove (41) is opened on the mounting rod (4). The slide rod (42) is symmetrically slidably connected to the inner wall of the mounting groove (11). The slide rod (42) is slidably connected to the presser foot handle (1).

3. A sewing machine presser foot assembly according to claim 2, characterized in that, The finger block (43) is symmetrically fixedly connected to the top of the slide bar (42), the rectangular plate (44) is fixedly connected to the end of one of the slide bars (42), and the rectangular block (45) is fixedly connected to the end of the other slide bar (42).

4. A sewing machine presser foot assembly according to claim 3, characterized in that, The rectangular block (45) is inserted into the rectangular plate (44).

5. A sewing machine presser foot assembly according to claim 2, characterized in that, Two second springs (46) are provided. One end of each second spring (46) is fixedly connected to the side wall of the mounting groove (11), and the other end of each second spring (46) is fixedly connected to the side wall of the rectangular plate (44) and the rectangular block (45), respectively.

6. A sewing machine presser foot assembly according to claim 1, characterized in that, The bottom of the low-pressure foot (2) is provided with multiple circular protrusions.

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