Sewing machine presser foot

Abstract

The utility model provides a sewing machine presser foot belongs to sewing machine technical field. It solved the problem that the sewing machine presser foot of prior art is difficult to adjust the down pressure of presser foot plate according to the thickness difference of sewing fabric. The sewing machine presser foot, including presser foot handle and the presser foot plate of rotation connection in presser foot handle, the rear end of presser foot plate has the limit block, the presser foot handle is connected with the limit board that presents the vertical setting through fastener, the lower extreme of limit board has the limit hole, the limit block can swing up and down and set in the limit hole, the fastener is connected with the tension spring that presents the vertical setting between limit block. The utility model has the advantage that the presser foot can automatically adjust the down pressure of presser foot plate according to the thickness difference of sewing fabric.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a sewing machine presser foot. Background Technology

[0002] The presser foot is a key component of the sewing machine's feeding mechanism, primarily responsible for fabric conveying and positioning. For example, Chinese patent literature discloses an adjustable presser foot for sewing machines (application number: 202220600920.7), which includes a presser foot body, a connecting block rotatably connected to the top of the presser foot body, a guide block that can slide laterally on the presser foot body, a guide groove formed between the guide block and the presser foot body, and a needle hole on the presser foot body. In this design, the size of the guide groove is adjusted by the laterally movable guide block, making the size of the pleats produced by this presser foot adjustable.

[0003] The adjustable presser foot of this sewing machine has the following shortcomings during use: it is difficult to adjust the downward pressure of the presser foot according to the thickness of the sewing fabric, resulting in inconsistent stitch quality. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a sewing machine presser foot. The technical problem this invention aims to solve is the difficulty in adjusting the downward pressure of the presser foot plate according to the thickness of the sewing fabric in existing sewing machine presser feet.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A sewing machine presser foot includes a presser foot handle and a presser foot plate rotatably connected to the presser foot handle. The presser foot plate has a limiting block at its rear end, the presser foot handle is connected to a vertically arranged limiting plate via a fastener, the lower end of the limiting plate has a limiting hole, the limiting block is oscillatingly disposed within the limiting hole, and a vertically arranged tension spring connects the fastener and the limiting block.

[0007] This sewing machine presser foot utilizes a spring and a swinging presser foot plate to automatically adjust the pressing pressure according to the thickness of the sewing fabric. This ensures the presser foot's pressure is matched to the fabric thickness, solving the problem of existing presser feet failing to adjust pressure based on fabric thickness. This makes the presser foot suitable for a wider range of sewing scenarios. Furthermore, its simple structure and low manufacturing cost facilitate widespread adoption.

[0008] Specifically, when the sewing fabric changes from thin to thick, the front end of the presser foot swings upward under the pressure of the fabric, while the rear end swings downward. Simultaneously, the limiting block at the rear end of the presser foot stretches the tension spring as it swings downward, until the presser foot is completely on the thicker fabric. The presser foot then compresses the tension spring upward, increasing the downward pressure on the fabric under the spring's restoring force. Conversely, when the sewing fabric changes from thick to thin, the front end of the presser foot swings downward under the spring's restoring force, while the rear end remains on the thicker fabric until it is completely on the thinner fabric. Under the spring's action, the presser foot comes into contact with the fabric, releasing some of the spring's restoring force, thus reducing the downward pressure on the fabric. Meanwhile, since the limiting block can be moved up and down in the limiting hole, the edge of the limiting hole can limit the swing amplitude of the presser foot plate, preventing the presser foot plate from swinging too much when the thickness of the sewing fabric changes.

[0009] In the aforementioned sewing machine presser foot, the limiting plate is made of metal and is in the shape of a long strip. The limiting block is in the shape of an inverted L or U. Under the action of a tension spring, the limiting block abuts against the upper edge of the limiting hole, and there is a gap between the limiting block and the lower edge of the limiting hole. The limiting plate, made of metal, allows for a better vertical connection between the presser foot handle and the limiting block. The limiting block, with its aforementioned shape, can swing up and down within the limiting hole without dislodging from it.

[0010] In the aforementioned sewing machine presser foot, the upper end of the limiting plate has a vertically oriented strip hole, and the fastener is a bolt. The bolt passes through the strip hole and fixes the limiting plate to the presser foot handle. The vertical position of the limiting hole can be adjusted by adjusting the fixed position of the upper end of the limiting plate, thereby changing the vertical swing amplitude of the presser foot plate limiting block.

[0011] In the aforementioned sewing machine presser foot, the strip hole is racetrack-shaped, and the presser foot handle has a fixing hole. The bolt passes through the strip hole and is threaded onto the fixing hole. This makes the installation and removal of the limiting plate more convenient.

[0012] In the aforementioned sewing machine presser foot, the tension spring is located outside the limiting plate, with its upper end secured to the bolt and its lower end secured to the limiting block. This makes the installation and removal of the tension spring more convenient and allows it to better drive the presser foot plate to swing.

[0013] In the aforementioned sewing machine presser foot, the limiting hole is rectangular, and the limiting block is clearance-fitted with the limiting hole in the width direction. The length of the limiting hole is greater than or equal to the length of the limiting block. This allows the edge of the limiting hole to guide the swing of the presser foot plate, and the fact that the length of the limiting hole is greater than or equal to the length of the limiting block facilitates the assembly and disassembly of the limiting block and the limiting hole.

[0014] In the aforementioned sewing machine presser foot, a roller that can rotate relative to the presser foot plate is vertically mounted on the presser foot plate. The outer circumferential surface of the roller has anti-slip texture, and the bottom of the roller protrudes from the presser foot plate. The roller can reduce direct friction between the sewing fabric and the presser foot plate. At the same time, when handling smooth fabrics such as silk, the roller can apply pressure evenly and roll with the fabric, avoiding problems such as fabric slippage and wrinkling.

[0015] Compared with existing technologies, the advantages of this sewing machine presser foot are as follows: This sewing machine presser foot can automatically adjust the downward pressure of the presser foot plate according to the different thicknesses of the sewing fabric, so that the downward pressure of the sewing machine presser foot can be adapted to the thickness of the sewing fabric. This makes this sewing machine presser foot suitable for more sewing scenarios. At the same time, this sewing machine presser foot has a simple structure, low manufacturing cost, and is easy to promote and use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the presser foot of this sewing machine.

[0017] Figure 2 This is an exploded view of the presser foot of a sewing machine.

[0018] In the diagram, 1 is the presser foot handle; 1a is the fixing hole; 2 is the presser foot plate; 2a is the limit block; 3 is the fastener; 4 is the limit plate; 4a is the limit hole; 4b is the strip hole; 5 is the tension spring; 6 is the roller; and 6a is the anti-slip texture. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] A sewing machine presser foot, as shown in the reference Figure 1-2 It includes a presser foot handle 1 and a presser foot plate 2 rotatably connected to the presser foot handle 1. The rear end of the presser foot plate 2 has an inverted L-shaped limiting block 2a (the limiting block 2a can also be set as an inverted U-shape according to actual needs). The presser foot handle 1 is connected to a vertically arranged limiting plate 4 by a fastener 3. The lower end of the limiting plate 4 has a limiting hole 4a. The limiting block 2a is swaying up and down in the limiting hole 4a. A vertically arranged tension spring 5 is connected between the fastener 3 and the limiting block 2a.

[0021] Reference Figure 1and Figure 2 Specifically, the limiting plate 4 is made of metal and is in the shape of a long strip. Under the action of the tension spring 5, the limiting block 2a abuts against the upper edge of the limiting hole 4a, and there is a gap between the limiting block 2a and the lower edge of the limiting hole 4a.

[0022] Reference Figure 1 and Figure 2 Specifically, the upper end of the limiting plate 4 has a vertically opening strip hole 4b, the fastener 3 is a bolt, the bolt passes through the strip hole 4b and fixes the limiting plate 4 to the presser foot handle 1; the strip hole 4b is racetrack shaped, the presser foot handle 1 has a fixing hole 1a, the bolt passes through the strip hole 4b and is threaded onto the fixing hole 1a.

[0023] Reference Figure 1 and Figure 2 More specifically, the tension spring 5 is located outside the limiting plate 4, the upper end of the tension spring 5 is engaged with the bolt, and the lower end of the tension spring 5 is engaged with the limiting block 2a.

[0024] In this embodiment, the limiting hole 4a is preferably rectangular, the limiting block 2a is in clearance fit with the limiting hole 4a in the width direction, and the length of the limiting hole 4a is greater than or equal to the length of the limiting block 2a.

[0025] Reference Figure 1 and Figure 2 Furthermore, a roller 6 that can rotate relative to the presser foot plate 2 is vertically mounted on the presser foot plate 2. The outer circumferential surface of the roller 6 has anti-slip texture 6a, and the bottom of the roller 6 protrudes from the presser foot plate 2.

[0026] The working principle of this sewing machine presser foot is explained below:

[0027] This sewing machine presser foot can automatically adjust the downward pressure of the presser foot plate according to the thickness of the sewing fabric. Specifically, when the sewing fabric changes from thin to thick, the front end of the presser foot plate 2 swings upward under the compression of the sewing fabric, and the corresponding rear end of the presser foot plate 2 swings downward. At the same time, the limiting block 2a located at the rear end of the presser foot plate 2 pulls the tension spring 5 downward until the presser foot plate 2 is completely on the thicker sewing fabric. The presser foot plate 2 then compresses the tension spring 5 upward. At this time, the downward pressure of the presser foot plate 2 on the sewing fabric increases under the action of the restoring force of the tension spring 5. When the sewing fabric changes from thick to thin, the front end of the presser foot plate 2 first swings downward under the action of the restoring force of the tension spring 5, while the rear end of the presser foot plate 2 is still on the thicker sewing fabric. This continues until the presser foot plate 2 is completely on the thinner sewing fabric. Under the action of the tension spring 5, the presser foot plate 2 comes into contact with the sewing fabric. At this time, the restoring force of the tension spring 5 is released to a certain extent, so the downward pressure of the presser foot plate 2 on the sewing fabric decreases.

[0028] Meanwhile, since the limiting block 2a can be moved up and down in the limiting hole 4a, the edge of the limiting hole 4a can limit the swing amplitude of the presser foot 2, preventing the presser foot 2 from swinging too much when the thickness of the sewing fabric changes. In addition, the presser foot of this sewing machine has a simple structure, low manufacturing cost, and is easy to promote and use.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A sewing machine presser foot, comprising a presser foot handle (1) and a presser foot plate (2) rotatably connected to the presser foot handle (1), characterized in that, The rear end of the presser foot plate (2) has a limiting block (2a). The presser foot handle (1) is connected to a vertically arranged limiting plate (4) by a fastener (3). The lower end of the limiting plate (4) has a limiting hole (4a). The limiting block (2a) is swaying up and down in the limiting hole (4a). A vertically arranged tension spring (5) is connected between the fastener (3) and the limiting block (2a). The upper end of the limiting plate (4) has a vertically opened strip hole (4b). The fastener (3) is a bolt. The bolt passes through the strip hole (4b) and fixes the limiting plate (4) on the presser foot handle (1). The tension spring (5) is located outside the limiting plate (4). The upper end of the tension spring (5) is engaged with the bolt, and the lower end of the tension spring (5) is engaged with the limiting block (2a).

2. A sewing machine presser foot according to claim 1, characterized in that, The limiting plate (4) is made of metal and is in the shape of a long strip. The limiting block (2a) is in the shape of an inverted L or an inverted U. Under the action of the tension spring (5), the limiting block (2a) abuts against the upper edge of the limiting hole (4a). There is a gap between the limiting block (2a) and the lower edge of the limiting hole (4a).

3. A sewing machine presser foot according to claim 1, characterized in that, The strip hole (4b) is racetrack shaped, and the presser foot handle (1) has a fixing hole (1a). The bolt passes through the strip hole (4b) and is threaded onto the fixing hole (1a).

4. A sewing machine presser foot according to claim 1, characterized in that, The limiting hole (4a) is rectangular, and the limiting block (2a) is in clearance fit with the limiting hole (4a) in the width direction. The length of the limiting hole (4a) is greater than or equal to the length of the limiting block (2a).

5. A sewing machine presser foot according to any one of claims 1-4, characterized in that, The presser foot plate (2) is vertically mounted with a roller (6) that can rotate relative to it. The outer circumferential surface of the roller (6) has anti-slip texture (6a), and the bottom of the roller (6) protrudes from the presser foot plate (2).

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