Presser foot structure of sewing machine

Abstract

The utility model provides a presser foot structure of a sewing machine, and belongs to the technical field of sewing machines. The presser foot structure solves the problem that an existing presser foot structure is difficult to replace and maintain after being damaged. According to the presser foot structure of the sewing machine, the sewing machine comprises a presser foot handle and a presser foot plate, the middle of the presser foot plate is hinged to the presser foot handle, the presser foot structure comprises an adjusting screw connected to the presser foot handle in a threaded mode, the adjusting screw is obliquely arranged, the rear end of the presser foot plate is detachably connected with a thread pressing plate, and the lower end of the adjusting screw abuts against the thread pressing plate. After the presser foot structure of the sewing machine is used for a long time, the thread pressing plate can be directly replaced after the thread pressing plate is damaged, the presser foot plate does not need to be replaced, and the thread pressing plate can be rapidly replaced and maintained after being abraded.

Description

Technical Field

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

[0002] The presser foot of a sewing machine functions to press and flatten the fabric during the sewing process. There are many types of sewing fabrics. During the sewing process, the upper and lower layers of fabric need to be sewn together with a thread. If the upper fabric is too thick and the presser foot is not lifted quickly, wrinkles will appear on the upper fabric, resulting in wrinkles at the seam when sewing.

[0003] To address the above situation, a roller-equipped elastic presser foot, as disclosed in Chinese Patent Application No. CN212175191U, has been developed. This presser foot includes a presser foot fixing base, a portal frame fixedly connected to the lower end of the presser foot fixing base, and a fabric pressing skid connected to the portal frame via a rotating connecting shaft. A roller mounting groove is provided on the bottom surface of the fabric pressing skid, and a roller is installed in the middle of the rotating connecting shaft. The roller is located within the roller mounting groove, and its lower end is lower than the bottom surface of the fabric pressing skid. A screw mounting plate is fixedly installed on the upper end of the portal frame, and a screw mounting hole is provided on the screw mounting hole. An adjusting screw is installed in the screw mounting hole, and the lower end of the adjusting screw is in abutting contact with the rear end of the fabric pressing skid. The rear end of the fabric pressing skid is connected to one end of a spring, and the other end of the spring is connected to the screw mounting plate or the presser foot fixing base.

[0004] The above structure involves directly pressing the adjusting screw against the rear end of the fabric pressing skid, which then rotates on the portal frame via a rotating connecting shaft. However, because the adjusting screw is directly pressed against the rear end of the fabric pressing skid, it will cause damage to the skid during prolonged use, resulting in pits and other wear at the rear end, which will affect the adjustment accuracy of the adjusting screw. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a presser foot structure for sewing machines. The technical problem to be solved by this utility model is: how to solve the problem of difficulty in replacing and repairing existing presser foot structures after they are damaged.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A presser foot structure for a sewing machine, the sewing machine including a presser foot handle and a presser foot plate hinged to the presser foot handle in the middle, the presser foot structure including an adjusting screw threaded to the presser foot handle, the adjusting screw being inclined, characterized in that a quilting plate is detachably connected to the rear end of the presser foot plate, and the lower end of the adjusting screw abuts against the quilting plate.

[0008] Working principle: When feeding thicker fabric, the adjusting screw can be rotated downwards to increase the up-and-down swing stroke of the pressure plate. This allows the feed dog and pressure plate to move the upper and lower layers of fabric synchronously. When feeding thicker fabric, the adjusting screw presses down the rear end of the pressure plate through the pressure plate. The middle part of the pressure plate is hinged to the pressure foot handle, causing the front end of the pressure plate to tilt upwards, facilitating the feeding of thicker fabric. When feeding thinner fabric, the adjusting screw can be moved upwards, reducing the tilt of the front end of the pressure plate through its contact with the pressure plate. This allows the pressure plate to stably press and feed the fabric. The above structure, with the addition of a pressure plate that is detachably connected to the pressure plate, allows for direct replacement of the pressure plate after prolonged use, eliminating the need to replace the pressure plate itself. This enables quick replacement and repair of the pressure plate after wear.

[0009] In the presser foot structure of the sewing machine described above, the presser foot plate has a horizontally arranged mounting wall, the presser plate presses against the mounting wall and is fixed to the presser foot plate by fasteners, the presser plate has an abutment wall arranged parallel to the mounting wall, and the adjusting screw abuts against the abutment wall.

[0010] By setting up the mounting wall and the abutment wall, when the adjusting screw abuts against the pressure plate, the pressure plate can push the pressure foot plate to move synchronously. The abutment wall and the mounting wall are set parallel to each other, so that when the adjusting screw is pressed down, it will not affect the different tilt angles of the abutment wall and the mounting wall, thus avoiding adjustment errors and improving the stability of adjustment.

[0011] In the presser foot structure of the sewing machine described above, the upper end of the adjusting screw is provided with an internal hexagon countersunk hole.

[0012] This design eliminates the need for nuts or other components to secure the adjusting screw, thus facilitating nut adjustment and improving ease of adjustment.

[0013] In the presser foot structure of the sewing machine described above, the lower end of the presser foot handle protrudes to form a mounting block. The mounting block has an inclined threaded hole. The adjusting screw is threadedly connected to the threaded hole of the mounting block. The side wall of the mounting block has a positioning hole. This presser foot structure also includes a positioning screw, which can press the adjusting screw against the wall of the threaded hole.

[0014] By incorporating a positioning screw, the adjusting screw can be repositioned, ensuring that the adjusted screw will not loosen and affect the up-and-down movement of the pressure foot, thus improving the stability of its operation.

[0015] In the presser foot structure of the sewing machine described above, one end of the positioning screw is located inside the positioning hole, and this end has an internal hexagon countersunk hole.

[0016] This structure ensures that the end of the positioning screw does not protrude from the positioning hole, thus preventing the movement of the foot handle. Furthermore, the inclusion of the internal hexagon countersunk hole 2 facilitates adjustment.

[0017] Compared with existing technologies, the presser foot structure of this sewing machine has the following advantages: by adding a suture plate, which is detachably connected to the presser foot plate, the suture plate can be directly replaced after prolonged use when it is damaged, without the need to replace the presser foot plate. This allows for quick replacement and repair of the suture plate after it wears out. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembled structure of this utility model.

[0019] Figure 2 This is a side view of the assembled version of this utility model.

[0020] Figure 3 It is along Figure 2 Sectional view of AA.

[0021] In the diagram, 1 is the presser foot handle; 11 is the mounting block; 11a is the threaded hole; 11b is the positioning hole; 2 is the presser foot plate; 21 is the mounting wall; 3 is the adjusting screw; 31 is the first internal hexagon countersunk hole; 4 is the pressure plate; 41 is the abutment wall; 5 is the positioning screw; and 51 is the second internal hexagon countersunk hole. Detailed Implementation

[0022] 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.

[0023] like Figure 1 As shown, the presser foot structure of this sewing machine includes a presser foot handle 1 and a presser foot plate 2 hinged to the presser foot handle 1 in the middle.

[0024] Specifically, such as Figure 1-3 As shown, this presser foot structure includes an adjusting screw 3 threadedly connected to the presser foot handle 1. The adjusting screw 3 is inclined. A pressure plate 4 is detachably connected to the upper rear end of the presser foot plate 2. The lower end of the adjusting screw 3 abuts against the pressure plate 4.

[0025] Working principle: When feeding thicker fabric, the adjusting screw 3 can be rotated downwards to increase the up-and-down swing stroke of the pressure plate 4. This allows the feed dog and pressure plate 2 to move the upper and lower layers of fabric simultaneously. When feeding thicker fabric, the adjusting screw 3 presses down the rear end of the pressure plate 2 through the pressure plate 4. The middle part of the pressure plate 2 is hinged to the pressure foot handle 1. At this time, the front end of the pressure plate 2 is tilted upwards to facilitate the feeding of thicker fabric. When feeding thinner fabric, the adjusting screw 3 can be moved upwards. Through the contact with the pressure plate 4, the curvature of the front end of the pressure plate 2 is reduced, so that the pressure plate 2 can stably press and move the fabric. In the above structure, by adding the pressure plate 4, which is detachably connected to the pressure plate 2, the pressure plate 4 can be directly replaced after long-term use when it is damaged, without the need to replace the pressure plate 2. This allows for quick replacement and maintenance of the pressure plate 4 after it wears out.

[0026] like Figure 1 and Figure 2 As shown, the pressure foot plate 2 has a horizontally arranged mounting wall 21. The pressure plate 4 is pressed onto the mounting wall 21 and fixed to the pressure foot plate 2 by fasteners. The pressure plate 4 has an abutment wall 41 arranged parallel to the mounting wall 21. The adjusting screw 3 abuts against the abutment wall 41. The upper end of the adjusting screw 3 is provided with an internal hexagon countersunk hole 31.

[0027] like Figure 2 and Figure 3 As shown, the lower end of the presser foot handle 1 protrudes to form a mounting block 11. The mounting block 11 has an inclined threaded hole 11a. The adjusting screw 3 is threadedly connected to the threaded hole 11a of the mounting block 11. The side wall of the mounting block 11 has a positioning hole 11b. This presser foot structure also includes a positioning screw 5. The positioning screw 5 can press the adjusting screw 3 into the hole wall of the threaded hole 11a. One end of the positioning screw 5 is located in the positioning hole 11b, and this end has an internal hexagon countersunk hole 51.

[0028] 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 presser foot structure for a sewing machine, the sewing machine including a presser foot handle (1) and a presser foot plate (2) hinged in the middle to the presser foot handle (1), the presser foot structure including an adjusting screw (3) threadedly connected to the presser foot handle (1), the adjusting screw (3) being inclined, characterized in that, The pressure foot plate (2) is detachably connected to the pressure line plate (4) at its upper rear end, and the lower end of the adjusting screw (3) abuts against the pressure line plate (4).

2. The presser foot structure of the sewing machine according to claim 1, characterized in that, The pressure foot plate (2) has a horizontally arranged mounting wall (21), the pressure plate (4) is pressed on the mounting wall (21) and fixed to the pressure foot plate (2) by fasteners, the pressure plate (4) has an abutment wall (41) arranged parallel to the mounting wall (21), and the adjusting screw (3) abuts against the abutment wall (41).

3. The presser foot structure of the sewing machine according to claim 1 or 2, characterized in that, The upper end of the adjusting screw (3) is provided with an internal hexagonal countersunk hole (31).

4. The presser foot structure of the sewing machine according to claim 1 or 2, characterized in that, The lower end of the presser foot handle (1) protrudes to form a mounting block (11). The mounting block (11) has an inclined threaded hole (11a). The adjusting screw (3) is threadedly connected to the threaded hole (11a) of the mounting block (11). The side wall of the mounting block (11) has a positioning hole (11b). This presser foot structure also includes a positioning screw (5). The positioning screw (5) can press the adjusting screw (3) against the hole wall of the threaded hole (11a).

5. The presser foot structure of the sewing machine according to claim 4, characterized in that, One end of the positioning screw (5) is located inside the positioning hole (11b), and this end has an internal hexagonal countersunk hole (51).

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