Presser foot adjusting structure and sewing machine

Abstract

The utility model discloses a presser foot adjusting structure and a sewing machine, the presser foot adjusting structure comprises a presser foot plate and a presser foot rod located above the presser foot plate, and further comprises a presser foot elastic piece and a presser foot positioning pin, one end of the presser foot elastic piece is fixedly connected with the presser foot plate, and the other end of the presser foot elastic piece is provided with a through hole; one end of the presser foot positioning pin is fixedly connected with the presser foot rod, and the other end penetrates through the through hole until being spherically hinged with the presser foot plate; when the cloth is low in front and high in back, the presser foot plate rotates back and forth around the presser foot positioning pin under the extrusion of the cloth, the presser foot elastic piece elastically deforms along with the presser foot plate in the rotating process, the presser foot elastic piece adjusts the front-back angle of the presser foot plate through elastic force, the presser foot plate has enough acting force to compact the cloth, and the cloth is tightly pressed. Frequent needle skipping and thread breaking are avoided, the failure rate is reduced, and work is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing equipment, and particularly relates to a presser foot adjusting structure and a sewing machine. Background Art

[0002] Taking a bartack machine as an example, existing bartack machines are usually used to reinforce stitches and are generally suitable for various sewing scenarios such as denim, woven, and knitted fabrics, and the presser foot needs to be quickly replaced. However, limited by the existing technology, the presser foot of the existing bartack machine cannot adapt to the sewing scenario with a lower front and a higher rear, resulting in easy stitch skipping and thread breakage during sewing, and unreliable operation. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a presser foot adjusting structure and a sewing machine. The presser foot plate is spherically hinged to the presser foot rod by means of a presser foot positioning pin, and the presser foot elastic piece is used to keep pressing the fabric, solving the technical problem of unreliable operation of the presser foot of the existing sewing machine.

[0004] To achieve the above purpose, the utility model provides a presser foot adjusting structure, which includes a presser foot plate and a presser foot rod located above the presser foot plate, and further includes:

[0005] A presser foot elastic piece, one end of which is fixedly connected to the presser foot plate and the other end is provided with a through hole;

[0006] A presser foot positioning pin, one end of which is fixedly connected to the presser foot rod and the other end passes through the through hole until it is spherically hinged to the presser foot plate.

[0007] Preferably, a spherical protrusion is integrally provided at one end of the presser foot positioning pin, and a spherical groove is provided on the presser foot plate, and the spherical protrusion is matched with the spherical groove.

[0008] Preferably, one end of the presser foot rod facing the presser foot plate is bent to form a connecting edge; a connecting thread is provided at one end of the presser foot positioning pin away from the spherical protrusion, and the connecting thread passes through the connecting edge and is fixedly connected to a locking nut.

[0009] Preferably, the presser foot plate swings up and down relative to the presser foot rod along a set arc trajectory; the through hole is an oblong hole extending along the tangent direction of the set arc trajectory, and the diameter of the presser foot positioning pin is equal to the width of the through hole.

[0010] Preferably, it further includes a presser foot guiding pin fixedly connected to the presser foot rod, a limiting hole is formed on the presser foot plate, and the presser foot guiding pin can be slidably inserted into the limiting hole, and the presser foot guiding pin is used to guide the presser foot plate to swing up and down along the set arc trajectory.

[0011] Preferably, the limiting hole is an oblong hole extending along the tangent direction of the set arc trajectory, and the diameter of the presser foot guiding pin is equal to the width of the limiting hole.

[0012] Preferably, the presser foot guiding pin is fixed to the presser foot rod by press riveting.

[0013] Preferably, a fixing hole is provided at one end of the presser foot spring plate away from the through hole, and a fastening screw is inserted into the fixing hole and fixedly connected to the presser foot plate.

[0014] Preferably, an elastic part is formed in the middle section of the presser foot spring plate, and the elastic part is a stepped structure.

[0015] The present utility model further provides a sewing machine, including the above presser foot adjusting structure.

[0016] Compared with the background art, the presser foot adjusting structure provided by the present utility model includes a presser foot plate, a presser foot bar, a presser foot spring plate and a presser foot positioning pin. One end of the presser foot spring plate is fixedly connected to the presser foot plate and the other end is provided with a through hole. One end of the presser foot positioning pin is fixedly connected to the presser foot bar and the other end passes through the through hole until it is spherically hinged to the presser foot plate; when the cloth is in a situation where the front is low and the back is high, the presser foot plate rotates back and forth around the presser foot positioning pin under the extrusion of the cloth. During the rotation of the presser foot plate, the presser foot spring plate undergoes elastic deformation accordingly. The presser foot spring plate adjusts the front and back angles of the presser foot plate by relying on the elastic force, so that the presser foot plate has sufficient acting force to compact the cloth, avoiding frequent needle jumping and thread breaking situations, reducing the failure rate and making the work more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0018] Figure 1 Is an axonometric view of the presser foot adjusting structure provided by the embodiment of the present utility model;

[0019] Figure 2 Is Figure 1 The side view of;

[0020] Figure 3 Is Figure 1 The partial view of;

[0021] Figure 4 Is Figure 1 The structural diagram of the presser foot plate in;

[0022] Figure 5 Is Figure 1 The structural diagram of the presser foot spring plate in;

[0023] Figure 6 Is Figure 1 The structural diagram of the presser foot positioning pin in.

[0024] The reference numerals are as follows:

[0025] Presser foot plate 1, presser foot rod 2, presser foot spring piece 3, presser foot positioning pin 4, lock nut 5, presser foot guide pin 6 and fastening screw 7

[0026] Spherical groove 11 and limit hole 12;

[0027] Connection edge 21;

[0028] Through hole 31 and elastic part 32;

[0029] Spherical protrusion 41 and stop ring 42.

[0030] attached Figure 1 The arrow in the figure is the set arc trajectory of the presser foot plate. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] In order to enable those skilled in the art in this technical field to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] An embodiment of the present invention discloses a presser foot adjustment structure. As shown in the attached Figures 1 to 3 figure, it includes a presser foot plate 1, a presser foot rod 2, a presser foot spring piece 3 and a presser foot positioning pin 4. The presser foot rod 2 is located above the presser foot plate 1. The presser foot rod 2 includes a vertical plate, a horizontal plate, an inclined plate and a connection edge 21. The vertical plate extends in the vertical direction, the horizontal plate extends in the horizontal direction, the vertical plate and the horizontal plate are integrally and perpendicularly connected, and the inclined plate extends obliquely from the bottom end of the horizontal plate towards the direction close to the presser foot plate 1. The end of the inclined plate is bent to form a connection edge 21, and the connection edge 21 is arranged at an angle with the presser foot plate 1. The presser foot plate 1 is in a flat plate shape, and a long hole is formed in the center thereof. One presser foot rod 2 is provided at each end of the presser foot plate 1, and the two presser foot rods 2 are respectively connected to the two ends of the presser foot plate 1 by means of the presser foot positioning pins 4, so that the presser foot plate 1 is uniformly stressed.

[0034] As shown in the attached Figure 5 figure, one end of the presser foot spring piece 3 is fixedly connected to the presser foot plate 1 and a through hole 31 is provided at the other end. The connection edge 21 of the presser foot rod 2 and the presser foot plate 1 are kept in tension by the elastic force of the presser foot spring piece 3, so that the presser foot plate 1 continuously maintains sufficient pressure. One end of the presser foot positioning pin 4 is fixedly connected to the presser foot rod 2 and the other end passes through the through hole 31 until it is spherically hinged to the presser foot plate 1, so that the presser foot plate 1 can rotate relative to the presser foot rod 2.

[0035] Through the connection mode between the presser foot plate 1 and the presser foot bar 2, the presser foot plate 1 can rotate relative to the presser foot bar 2; when the fabric is in the situation of being lower in the front and higher in the back, the presser foot plate 1 rotates back and forth around the presser foot positioning pin 4 under the extrusion of the fabric. During the rotation of the presser foot plate 1, the presser foot spring piece 3 undergoes elastic deformation accordingly. The presser foot spring piece 3 adjusts the front-back angle of the presser foot plate 1 by relying on the elastic force, enabling the presser foot plate 1 to have sufficient acting force to compact the fabric, avoiding frequent occurrence of skipped stitches and broken threads, reducing the failure rate, and making the work more reliable.

[0036] As a preferred embodiment, as shown in the appendix Figure 6 One end of the presser foot positioning pin 4 is integrally provided with a spherical protrusion 41. As shown in the appendix Figure 4 One end of the presser foot positioning pin 4 is integrally provided with a spherical protrusion 41. As shown in the appendix, the presser foot plate 1 is provided with a spherical groove 11. The spherical protrusion 41 cooperates with the spherical groove 11, enabling the presser foot plate 1 to rotate relative to the presser foot bar 2 around the spherical protrusion 41. Of course, swapping the installation positions of the spherical protrusion 41 and the spherical groove 11 does not affect the achievement of the purpose of the present utility model.

[0037] The presser foot positioning pin 4 is detachably connected to the presser foot bar 2. As a preferred embodiment, one end of the presser foot bar 2 facing the presser foot plate 1 is bent to form a connecting edge 21; one end of the presser foot positioning pin 4 away from the spherical protrusion 41 is provided with a connecting thread, and the connecting thread passes through the connecting edge 21 and is fixedly connected to the locking nut 5; when it is necessary to replace the fabric, loosen the locking nut 5 and remove the presser foot positioning pin 4, then the presser foot plate 1 and the presser foot bar 2 can be disassembled, which is convenient for replacing the presser foot plate 1 with different sewing ranges, with less replacement difficulty and more convenient operation.

[0038] The presser foot plate 1 swings up and down relative to the presser foot bar 2 along a set arc trajectory to ensure that the presser foot plate 1 does not rotate left and right. As a preferred embodiment, the through hole 31 is an elongated hole extending along the tangent direction of the set arc trajectory, and the elongated hole specifically extends along the width direction of the presser foot plate 1. The diameter of the presser foot positioning pin 4 is equal to the width of the through hole 31, enabling the outer side surface of the presser foot positioning pin 4 to abut against the opposite two side surfaces of the through hole 31, making the presser foot positioning pin 4 move only back and forth along the through hole 31, restricting the presser foot positioning pin 4 from moving left and right relative to the through hole 31, thereby ensuring that the presser foot plate 1 does not swing left and right relative to the presser foot bar 2.

[0039] It should be added that a stop ring 42 is fixedly provided on the outer side surface of the presser foot positioning pin 4. As shown in the appendix Figure 6 As shown in the appendix, the diameter of the stop ring 42 is larger than the width of the through hole 31, enabling the stop ring 42 to abut against the hole edge of the through hole 31 for limiting the position of the presser foot spring piece 3.

[0040] The presser foot adjusting structure further includes a presser foot guide pin 6 fixedly connected to the presser foot bar 2. As shown in the appendix Figure 1 and 3As shown in the figure, the presser foot plate 1 forms a limit hole 12, and the presser foot guide pin 6 can be slidably inserted into the limit hole 12, so that the presser foot guide pin 6 can only swing back and forth along the limit hole 12, but cannot swing left and right along the limit hole 12, enabling the presser foot guide pin 6 to guide the presser foot plate 1 to swing up and down along a set arc trajectory.

[0041] As a preferred embodiment, as shown in the appendix Figure 3 and 4 As shown in the figure, the limit hole 12 is an oblong hole extending along the tangent direction of the set arc trajectory. The limit hole 12 is parallel to the through hole 31, and both extend along the width direction of the presser foot plate 1. The diameter of the presser foot guide pin 6 is equal to the width of the limit hole 12, so that the outer side surface of the presser foot guide pin 6 abuts against the opposite side surfaces of the limit hole 12. Both the limit hole 12 and the through hole 31 have a guiding function and maintain a certain distance. In a redundant design manner, it is restricted that the presser foot plate 1 can only swing up and down relative to the presser foot rod 2, but will not swing left and right relative to the presser foot rod 2, making the rotation of the presser foot plate 1 smoother, avoiding jamming between the presser foot positioning pin 4 and the presser foot spring piece 3, reducing faults, and making the presser foot plate 1 work more reliably.

[0042] As shown in the appendix Figure 3 As shown in the figure, the presser foot guide pin 6 is press riveted and fixed to the presser foot rod 2, making the fixation of the presser foot guide pin 6 more secure. Of course, the presser foot guide pin 6 can also be fixed by welding or threaded connection methods, which are not specifically limited here.

[0043] As a preferred embodiment, as shown in the appendix Figure 1 As shown in the figure, a fixing hole is provided at one end of the presser foot spring piece 3 away from the through hole 31. A fastening screw 7 is inserted into the fixing hole, and the fastening screw 7 is fixedly connected to the presser foot plate 1, facilitating the removal of the presser foot spring piece 3 from the presser foot plate 1, thereby facilitating the replacement of the failed presser foot spring piece 3.

[0044] As shown in the appendix Figure 5 As shown in the figure, an elastic portion 32 is formed in the middle section of the presser foot spring piece 3. The elastic portion 32 is a stepped structure, that is, the end of the presser foot spring piece 3 provided with the through hole 31 is higher than the other end, enabling the presser foot spring piece 3 to provide a large range of elastic force by virtue of its own sheet structure and the elastic portion 32.

[0045] The present utility model also provides a sewing machine, including the above-mentioned presser foot adjusting structure.

[0046] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0047] In this article, specific examples are used to elaborate on the principle and implementation mode of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A presser foot adjusting structure, characterized in that, It includes a presser foot plate (1) and a presser foot bar (2) located above the presser foot plate (1), and further includes: A presser foot elastic piece (3), one end of which is fixedly connected to the presser foot plate (1) and the other end is provided with a through hole (31); A presser foot positioning pin (4), one end of which is fixedly connected to the presser foot bar (2) and the other end passes through the through hole (31) until it is spherically hinged to the presser foot plate (1).

2. The presser foot adjusting structure according to claim 1, wherein One end of the presser foot positioning pin (4) is integrally provided with a spherical protrusion (41), the presser foot plate (1) is provided with a spherical groove (11), and the spherical protrusion (41) cooperates with the spherical groove (11).

3. The presser foot adjusting structure according to claim 2, wherein, One end of the presser foot bar (2) facing the presser foot plate (1) is bent to form a connecting edge (21); the end of the presser foot positioning pin (4) away from the spherical protrusion (41) is provided with a connecting thread, and the connecting thread passes through the connecting edge (21) and is fixedly connected to a locking nut (5).

4. The presser foot adjusting structure according to any one of claims 1 to 3, characterized in that, The presser foot plate (1) swings up and down relative to the presser foot bar (2) along a set circular arc trajectory; the through hole (31) is an oblong hole extending along the tangent direction of the set circular arc trajectory, and the diameter of the presser foot positioning pin (4) is equal to the width of the through hole (31).

5. The presser foot adjusting structure according to claim 4, characterized in that, It further includes a presser foot guiding pin (6) fixedly connected to the presser foot bar (2), the presser foot plate (1) forms a limiting hole (12), the presser foot guiding pin (6) is slidably inserted into the limiting hole (12), and the presser foot guiding pin (6) is used to guide the presser foot plate (1) to swing up and down along a set circular arc trajectory.

6. The presser foot adjusting structure according to claim 5, characterized in that The limiting hole (12) is an oblong hole extending along the tangent direction of the set circular arc trajectory, and the diameter of the presser foot guiding pin (6) is equal to the width of the limiting hole (12).

7. The presser foot adjusting structure according to claim 5, characterized in that, The presser foot guiding pin (6) is press riveted and fixed to the presser foot bar (2).

8. The presser foot adjusting structure according to any one of claims 1 to 3, characterized in that, One end of the presser foot elastic piece (3) away from the through hole (31) is provided with a fixing hole, and a fastening screw (7) is inserted into the fixing hole, and the fastening screw (7) is fixedly connected to the presser foot plate (1).

9. The presser foot adjusting structure according to any one of claims 1 to 3, characterized in that, The middle section of the presser foot elastic piece (3) forms an elastic part (32), and the elastic part (32) is a stepped structure.

10. A sewing machine, characterized in that, It includes the presser foot adjusting structure according to any one of claims 1 to 9.

Images