Sewing machine presser foot

Abstract

The utility model provides a sewing machine presser foot belongs to sewing equipment technical field. It has solved the problem that the existing sewing machine is easy to appear the wrinkle, uneven between two layers of cloth when sewing the thick cloth strip on the bottom cloth. This sewing machine presser foot, including the seat body and the left presser foot and right presser foot of upper and lower movable ground setting in the seat body, be connected with the linkage lever for making the left presser foot and right presser foot interlock on the seat body, still be equipped with height adjusting mechanism for adjusting the initial height difference of left presser foot and right presser foot on the seat body. The presser foot of the utility model can adjust the height difference between left presser foot and right presser foot according to the thickness of the upper thick cloth strip, make left presser foot and right presser foot can basically simultaneously with thick cloth strip and bottom cloth abut and fixed, and thick cloth strip and bottom cloth are more close, and more smooth and even when sewing, and higher quality.

Description

Technical Field

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

[0002] When a sewing machine sews fabric, the fabric needs to come into contact with the feed dogs below and be fed forward by friction with the feed dogs. To ensure stable contact between the fabric and the feed dogs and smooth feeding, a presser foot is installed above the fabric to press the fabric firmly against the feed dogs.

[0003] However, when sewing thick strips of fabric, especially reflective strips on warning clothing, the conventional presser foot can only make contact with the thicker strip and cannot secure the fabric on the sides of the reflective strip. This can easily lead to inconsistent feed rates between the reflective strip and the underlying fabric, resulting in wrinkles. To solve this problem, the current solution is a sewing machine presser foot disclosed in Chinese patent application (application number: 202322121608.7), which has movable left and right presser foot plates. These plates respectively contact the reflective strip and the underlying fabric to simultaneously secure both. However, since both the left and right presser feet have elastic elements, when the presser feet are above the reflective strip and before they come into contact with it, the bottom surfaces of the left and right presser feet will be at the same height under the action of the elastic elements. Therefore, when the presser feet fall to fix the fabric, the left presser foot will contact and fix the reflective strip first, and then the right presser foot will contact and fix the bottom layer of fabric on one side. Since there is a certain time difference between the two, there may be a certain deviation in the fit between the reflective strip and the bottom layer of fabric, which may result in unevenness such as wrinkles or skewing of the sewn fabric. Summary of the Invention

[0004] The purpose of this utility model is to address the aforementioned problems in existing technologies by proposing a sewing machine presser foot. The technical problem to be solved by this utility model is: how to make the sewing machine sew thicker fabrics more smoothly.

[0005] The purpose of this utility model can be achieved through the following technical solution: a sewing machine presser foot, including a base and a left presser foot and a right presser foot that can be movably disposed on the base, characterized in that a linkage lever for linking the left presser foot and the right presser foot is rotatably connected on the base, and the base is also provided with a height adjustment mechanism for adjusting the initial height difference between the left presser foot and the right presser foot.

[0006] This invention can be used to sew thick strips of fabric onto a base layer. In use, the base connects to the presser foot connecting rod of the sewing machine. By adjusting the height adjustment mechanism, the height difference between the left and right presser feet can be adjusted even before they contact the fabric, ensuring that the height difference between the left and right presser feet is approximately the same as the height of the thick strip. Thus, when the base moves the left and right presser feet down, they simultaneously contact the thick strip and one side of the base layer fabric, respectively, thus fixing both in place. This results in a closer fit between the thick strip and the base layer fabric, smoother and flatter sewing, and higher quality.

[0007] Moreover, because the left and right presser feet form a certain height difference before pressing down, the thick fabric strip can abut against the end face of the right presser foot that is closer to the left presser foot, thereby further improving the fitting accuracy and consistency between the thick fabric strip and the bottom layer fabric.

[0008] In the aforementioned sewing machine presser feet, the front side of the base has two vertically arranged sliding grooves and a mounting groove located between and communicating with the two sliding grooves. Both the left and right presser feet include a vertically arranged sliding part and a presser foot plate connected to the bottom of the sliding part. The sliding parts of the left and right presser feet are respectively embedded in the two sliding grooves and slide in cooperation with them. Each sliding part has a connecting groove along its horizontal direction. The linkage lever includes a connecting part and connecting arms located on both sides of the connecting part. The connecting part is embedded in the mounting groove and rotatably connected to the base. The two connecting arms extend into the connecting groove of one side of the sliding part, allowing the connecting head to movably engage with the connecting groove. Through the connection of the linkage lever, the left and right presser feet form a reverse linkage, enabling automatic adjustment when fixing fabrics of varying thicknesses to improve the fixing effect.

[0009] In the aforementioned sewing machine presser foot, the outer peripheral surface of the connector that contacts the connecting groove is an outwardly convex arc shape. This arc design allows for a rolling fit between the connector and the connecting groove, reducing sliding friction and thus minimizing wear and extending service life.

[0010] In the aforementioned sewing machine presser feet, both the left and right presser feet are equipped with height adjustment mechanisms. These mechanisms include an adjusting bolt and an elastic element. The adjusting bolt is threaded to the top wall of the slide groove, with its lower end extending into the groove. The elastic element is located within the slide groove, with both ends abutting against the adjusting bolt and the sliding part, respectively. The preload of the elastic element can be adjusted by the adjusting bolt, thereby adjusting the height difference between the left and right presser feet.

[0011] In the sewing machine presser foot mentioned above, the two sides of the mounting groove are connected to the sliding groove through the limiting groove, and the upper and lower side walls of the limiting groove have outward protrusions that limit the swing amplitude of the linkage lever.

[0012] In the aforementioned sewing machine presser foot, a guide frame is also fixed to the base. The guide frame has a long, narrow, and horizontally arranged guide groove located on the front side of the left presser foot. During sewing, the thick fabric strip can first pass through the guide frame and then enter under the left presser foot to fit against the bottom layer of fabric, thereby improving the fitting accuracy between the thick fabric strip and the bottom layer of fabric.

[0013] In the sewing machine presser foot described above, the guide frame is made of bent metal wire.

[0014] In the sewing machine presser foot described above, the guide frame includes a guide part, a connecting section, and a mounting part connected in sequence. The guide part includes guide sections spaced apart vertically, and the guide sections form the aforementioned guide groove.

[0015] In the sewing machine presser foot described above, a rolling shaft is fitted onto the lower guide section.

[0016] In the sewing machine presser foot described above, the outer end of the rolling shaft has an outwardly protruding limiting shoulder.

[0017] Compared with the prior art, the present invention has the following advantages: 1. The left and right presser feet of this utility model are movably mounted on the base, and a height adjustment mechanism is provided on the left and right presser feet. This allows the initial height difference between the left and right presser feet to be adjusted to accommodate the thickness of the thick fabric strip. When the base presses down, the left and right presser feet can almost simultaneously contact the thick fabric strip and the underlying fabric, resulting in a closer fit between the thick fabric strip and the underlying fabric, smoother and flatter sewing, and higher quality. Furthermore, the thick fabric strip can fit snugly against the side of the right presser foot during sewing, thereby improving the precision and consistency of the fit between the thick fabric strip and the underlying fabric.

[0018] 2. The base is also equipped with a guide frame with a guide groove, so that the thick fabric strip can be supported and guided by the guide frame before entering the left presser foot and fitting with the bottom layer of fabric, thereby improving the feeding stability of the thick fabric strip and improving the fitting accuracy between the thick fabric strip and the bottom layer of fabric. Attached Figure Description

[0019] Figure 1 Here is a schematic diagram of the structure of this utility model: Figure 2 This is an exploded view of the structure of this utility model; Figure 3 This is a structural schematic diagram of the hidden cover plate of this utility model from another perspective; Figure 4 This is a side view of the present invention in its working state; Figure 5 This is a front view of the present invention in its working state; Figure 6This is a schematic diagram of the linkage lever in conjunction with the left and right pressure feet; Figure 7 This is a structural schematic diagram of the guide frame; Figure 8 This is a schematic diagram of the guide frame in Embodiment 2.

[0020] In the diagram, 1. Seat; 11. Slide groove; 12. Mounting groove; 13. Limiting groove; 13a. Limiting protrusion; 21. Left pressure foot; 22. Right pressure foot; 2a. Sliding part; 2b. Pressure foot plate; 2c. Connecting groove; 3. Linkage lever; 31. Connecting part; 32. Connecting arm; 33. Connecting head; 41. Adjusting bolt; 42. Elastic element; 5. Guide frame; 5a. Guide groove; 51. Guide part; 511. Guide section; 52. Connecting section; 53. Mounting part; 6. Rolling shaft; 61. Limiting shoulder; 7. Pressure foot connecting rod; 8. Cover plate; 91. Bottom layer fabric; 92. Thick fabric strip. Detailed Implementation

[0021] 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. Example

[0022] like Figures 1-3 As shown, a sewing machine presser foot, which can be used to sew thick strips of fabric 92 on a base fabric, includes a base 1, a left presser foot 21, a right presser foot 22, a linkage lever 3, and a height adjustment mechanism. The base 1 is connected to the presser foot connecting rod 7 of the sewing machine, allowing the presser foot connecting rod 7 to drive the base 1 to move up and down. Both the left presser foot 21 and the right presser foot 22 are movably mounted on the base 1. The linkage lever 3 is rotatably connected to the base 1, and its two ends are movably connected to the left presser foot 21 and the right presser foot 22, respectively, allowing the left presser foot 21 and the right presser foot 22 to move up and down. When the right presser foot 22 moves up and down relative to the seat 1, it forms a linkage. The height adjustment mechanism can adjust the initial height difference between the left presser foot 21 and the right presser foot 22. That is, the bottom surface of the left presser foot 21 is slightly higher than the right presser foot 22. The height difference is basically the same as the thickness of the thick fabric strip 92. When the seat 1 moves down, the left presser foot 21 and the right presser foot 22 can basically simultaneously abut against the thick fabric strip 92 and the bottom fabric 91. Moreover, one side of the thick fabric strip 92 can fit against the side of the right presser foot 22, ensuring the fit between the thick fabric strip 92 and the bottom fabric, making the sewing process smoother and improving the flatness of the sewn product.

[0023] Specifically, such as Figures 2-6As shown, the front side of the base 1 has a mounting groove 12 and two sliding grooves 11. The two sliding grooves 11 are vertically arranged on both sides of the front side of the base 1. The mounting groove 12 is located between the two sliding grooves 11 and communicates with the two sliding grooves 11. The left pressure foot 21 and the right pressure foot 22 both include a vertically arranged sliding part 2a and a pressure foot plate 2b connected to the bottom of the sliding part 2a. The sliding parts 2a of the left pressure foot 21 and the right pressure foot 22 are respectively embedded in the two sliding grooves 11 and slide in cooperation with the two sliding grooves 11. The sliding parts 2a are both provided with a connecting groove 2c in the horizontal direction. The linkage lever 3 includes a connecting portion 31 located in the middle and connecting arms 32 located on both sides of the connecting portion 31 and extending outward. Each end of the connecting arms 32 has a connector 33. The connecting portion 31 is embedded in the mounting groove 12 and rotatably connected to the seat 1. The two connecting arms 32 extend into the connecting groove 2c of one side of the sliding portion 2a, so that the connector 33 at the end of the connecting arm 32 abuts against the side wall of the connecting groove 2c and forms a movable fit, causing the left pressure foot 21 and the right pressure foot 22 to form a reverse linkage when moving up and down. Furthermore, in this embodiment, the outer peripheral surface of the connector 33 that contacts the connecting groove 2c is arc-shaped, forming a rolling fit between the connector 33 and the connecting groove 2c to reduce sliding friction and wear between them.

[0024] Furthermore, the two sides of the mounting groove 12 are connected to the sliding groove 11 through the limiting groove 13 respectively. The upper and lower side walls of the limiting groove 13 have outwardly protruding limiting protrusions 13a. The limiting protrusions 13a are arc-shaped. When the linkage lever 3 swings to a certain extent, the connecting arm 32 can abut against the limiting protrusions 13a and limit the swing amplitude of the linkage lever 3 to a certain range, thereby avoiding excessive vertical lifting range of the left pressure foot 21 and the right pressure foot 22.

[0025] like Figure 3 , Figure 5 As shown, both the left pressure foot 21 and the right pressure foot 22 are equipped with height adjustment mechanisms. The height adjustment mechanism includes an adjusting bolt 41 and an elastic element 42. The adjusting bolt 41 is vertically threaded to the top wall of the slide groove 11, and the lower end of the adjusting bolt 41 extends into the slide groove 11 and is located above the sliding part 2a. In this embodiment, the elastic element 42 is a spring. The elastic element 42 is located in the slide groove 11, and both ends of the elastic element 42 abut against the end of the adjusting bolt 41 that extends into the slide groove 11 and the top of the sliding part 2a, respectively. By turning the adjusting bolt 41, the preload of the elastic element 42 can be adjusted, and the linkage lever 3 can be swung, thereby adjusting the height difference between the left pressure foot 21 and the right pressure foot 22.

[0026] Furthermore, a cover plate 8 is provided on the front side of the base 1. The cover plate 8 is fixed to the base 1 by screws or pins, so that the cover plate 8 can seal the slide groove 11 and the mounting groove 12.

[0027] Furthermore, such as Figure 4 , Figure 5 , Figure 7 As shown, a guide frame 5 is also fixed to one side of the seat body 1. The guide frame 5 has a narrow guide groove 5a, which is located in front of the left pressure foot 21. The width of the guide groove 5a is slightly larger than the thickness of the thick fabric strip 92, so that the thick fabric strip 92 passes through the guide groove 5a first and then enters below the left pressure foot 21 to fit against the bottom fabric 91. In this embodiment, the guide frame 5 is made of bent metal wire and includes a guide part 51, a connecting section 52, and a mounting part 53 connected in sequence. The mounting part 53 is bent to form a long mounting groove. The mounting part 53 is bent to form guide sections 511 that are spaced apart vertically. The guide groove 5a is formed between the two guide sections 511. The side wall of the seat body 1 has an outwardly protruding positioning protrusion. The mounting part 53 engages with the positioning protrusion through the mounting groove and is then fixed to the side wall of the seat body 1 by fixing bolts. The guide frame 5 provides support and guidance for the conveying of the thick fabric strip 92, preventing interference with the bottom fabric 91, improving the stability of the feeding of the thick fabric strip 92, and enhancing the matching accuracy between the thick fabric strip 92 and the bottom fabric 91. Example

[0028] like Figure 8 As shown, the technical solution of this embodiment is basically the same as that of Embodiment 1. The difference is that in this embodiment, a long strip-shaped rolling shaft 6 is also provided on the guide part 51 of the guide frame 5. The rolling shaft 6 is sleeved on the guide section 511 on the lower side of the guide part 51 and forms a rotational engagement with the guide section 511. The outer end of the rolling shaft 6 has a limiting shoulder 61 that protrudes outward and places the thick cloth strip 92 in the guide groove 5a, so that when the thick cloth strip 92 passes through the guide groove 5a, it is mounted on the rolling shaft 6, making the feeding smoother.

[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.

[0030] Although this document frequently uses terms such as seat 1, left pressure foot 21, right pressure foot 22, linkage lever 3, adjusting bolt 41, and elastic element 42, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A sewing machine presser foot, comprising a base (1) and a left presser foot (21) and a right presser foot (22) movably disposed on the base (1), characterized in that, The seat (1) is rotatably connected to a linkage lever (3) for linking the left presser foot (21) and the right presser foot (22). The seat (1) is also provided with a height adjustment mechanism for adjusting the initial height difference between the left presser foot (21) and the right presser foot (22).

2. The sewing machine presser foot according to claim 1, characterized in that, The front side of the seat (1) has two vertically arranged sliding grooves (11) and a mounting groove (12) located between the two sliding grooves (11) and communicating with the two sliding grooves (11). The left pressure foot (21) and the right pressure foot (22) each include a vertically arranged sliding part (2a) and a pressure foot plate (2b) connected to the bottom of the sliding part (2a). The sliding parts (2a) of the left pressure foot (21) and the right pressure foot (22) are respectively embedded in the two sliding grooves (11) and slide in cooperation with the sliding grooves (11). The sliding part (2a) a) Connecting grooves (2c) are opened horizontally on both sides of the linkage lever (3). The linkage lever (3) includes a connecting part (31) and connecting arms (32) located on both sides of the connecting part (31). The ends of the connecting arms (32) are all equipped with connectors (33). The connecting part (31) is embedded in the mounting groove (12) and rotatably connected to the seat (1). The two connecting arms (32) extend into the connecting grooves (2c) of the sliding part (2a) on one side and make the connectors (33) and the connecting grooves (2c) form a movable fit.

3. The sewing machine presser foot according to claim 2, characterized in that, The outer peripheral surface of the connector (33) that contacts the connecting groove (2c) is an outwardly convex arc shape.

4. The sewing machine presser foot according to claim 2, characterized in that, Both the left pressure foot (21) and the right pressure foot (22) are equipped with height adjustment mechanisms. The height adjustment mechanism includes an adjustment bolt (41) and an elastic element (42). The adjustment bolt (41) is threaded to the top wall of the slide groove (11) and the lower end of the adjustment bolt (41) extends into the slide groove (11). The elastic element (42) is located in the slide groove (11) and the two ends of the elastic element (42) abut against the adjustment bolt (41) and the sliding part (2a) respectively.

5. The sewing machine presser foot according to claim 2, 3, or 4, characterized in that, The two sides of the mounting groove (12) are connected to the sliding groove (11) through the limiting groove (13). The upper and lower side walls of the limiting groove (13) have a limiting protrusion (13a) that protrudes outward and is used to limit the swing amplitude of the linkage lever (3).

6. The sewing machine presser foot according to claim 1, 2, or 3, characterized in that, The seat (1) is also fixed with a guide frame (5), which has a long and horizontally arranged guide groove (5a) located on the front side of the left pressure foot (21).

7. The sewing machine presser foot according to claim 6, characterized in that, The guide frame (5) is made of bent metal wire.

8. The sewing machine presser foot according to claim 7, characterized in that, The guide frame (5) includes a guide part (51), a connecting section (52) and a mounting part (53) connected in sequence. The guide part (51) includes guide sections (511) arranged at intervals, and the guide groove (5a) is formed between the guide sections (511).

9. The sewing machine presser foot according to claim 8, characterized in that, A rolling shaft (6) is fitted onto the lower guide section (511).

10. The sewing machine presser foot according to claim 9, characterized in that, The outer end of the rolling shaft (6) has an outwardly protruding limiting shoulder (61).

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