Sewing machine presser foot and sewing machine

Abstract

The present application relates to the technical field of garment processing, in particular to a sewing machine presser foot and a sewing machine, wherein the sewing machine presser foot comprises a presser foot base and a brush, the brush comprises a mounting base and a soft brush layer, the mounting base is rotationally connected to the presser foot base, and the soft brush layer comprises soft brush hairs arranged in a circumferential direction of the mounting base; when sewing a sewing material, in a needle bar needle lowering stage, the presser foot base presses the sewing material, and the soft brush layer is located on a movement path of the needle bar so that the needle bar carries a sewing thread through the soft brush layer and then into the sewing material; in a needle bar needle lifting stage, the soft brush layer rotates in response to movement of the sewing material. By arranging the soft brush layer, the needle bar carries the sewing thread through the soft brush layer and then into the sewing material, and the soft brush layer rotates in response to movement of the sewing material, so that when two adjacent needles form a stitch, the soft brush fills a gap between the sewing material and the sewing thread, and supports the sewing material and the sewing thread to some extent, so that the tightness of the sewing material and the sewing thread is more suitable, thereby reducing the degree of wrinkles.

Description

Technical Field

[0001] This invention relates to the field of garment processing technology, and in particular to a sewing machine presser foot and a sewing machine. Background Technology

[0002] In the garment manufacturing industry, presser feet are used to apply pressure to the surface of the fabric to prevent the fabric from shifting during needle insertion. To reduce wrinkles after sewing, current garment manufacturing processes often include rollers on the side of the presser foot facing the fabric. These rollers reduce friction between the fabric and the presser foot during fabric movement, thus reducing wrinkles to some extent. However, with presser feet equipped with rollers, the pressure is uneven between the contact points between the rollers and the fabric and other parts of the presser foot, resulting in a relatively limited wrinkle-reducing effect.

[0003] In addition, when the presser foot in the existing technology is used to sew elastic fabrics with good extensibility, the seam is prone to be too tight after sewing due to the characteristics of elastic fabrics, which greatly reduces the extensibility of the fabric at the seam. Summary of the Invention

[0004] This invention provides a sewing machine presser foot to solve the technical problems in the prior art of excessive wrinkles after sewing and greatly reduced extensibility of elastic fabric at the seam after sewing elastic fabric.

[0005] This invention discloses a sewing machine presser foot, including a presser foot base and a brush. The brush includes a mounting base and a soft bristle layer. The mounting base is rotatably connected to the presser foot base, and the soft bristle layer includes soft bristles distributed circumferentially along the mounting base. During sewing, in the needle bar insertion stage, the presser foot base presses the fabric, and the soft bristle layer is located on the movement path of the needle bar, so that the needle bar carries the thread through the soft bristle layer and then enters the fabric. In the needle bar lifting stage, the soft bristle layer rotates in response to the movement of the fabric.

[0006] Optionally, the presser foot seat is provided with a connecting post, and the mounting seat is sleeved on the connecting post to be rotatably connected to the presser foot seat.

[0007] Optionally, the presser foot seat is provided with a pressing surface for pressing the sewing material and a top surface opposite to the pressing surface. An installation groove is formed between the pressing surface and the top surface. One end of the connecting post is connected to the top surface, and the other end of the connecting post extends into the installation groove. The mounting seat is sleeved on the other end of the connecting post, and the soft brush layer extends out from the installation groove and extends to the movement path of the needle bar.

[0008] Optionally, the connecting column includes a threaded section and a sleeved section, the top surface has a threaded hole that is threadedly connected to the threaded section, the sleeved section extends into the mounting groove, and the mounting seat is sleeved on the sleeved section.

[0009] Optionally, the brush further includes a gasket sandwiched between the mounting base and the pressure foot base.

[0010] Optionally, the mounting base is provided with a rotating shaft portion, and the pressure foot base is provided with a receiving groove for mounting the mounting base and a rotating shaft hole adapted to the rotating shaft portion.

[0011] Optionally, the presser foot base includes a first presser foot portion and a second presser foot portion, the first presser foot portion and the second presser foot portion are spaced apart, the mounting base is rotatably connected to the first presser foot portion or the second presser foot portion, and the end of the outer periphery of the soft bristle layer extends to the gap between the first presser foot portion and the second presser foot portion.

[0012] Optionally, the first presser foot and the second presser foot are rotatably connected to the mounting base, and the other is provided with a support groove on one side facing the mounting base, with the outer periphery of the soft bristle layer extending into the support groove.

[0013] Optionally, both the first presser foot and the second presser foot are provided with a mounting structure for rotatably connecting to the mounting base, and the mounting base is detachably mounted on the first presser foot and the second presser foot.

[0014] The present invention also discloses a sewing machine, including a presser foot bar and a sewing machine presser foot as described above, wherein the sewing machine presser foot is disposed on the presser foot bar.

[0015] The beneficial effects of the sewing machine presser foot provided in this invention are as follows: By setting a rotating brush on the presser foot seat, when sewing fabric, the soft brush bristles fill the area of ​​the stitch when two adjacent needles form a stitch. The soft brush bristles fill the gap between the fabric and the thread, providing a certain support for the fabric and the thread. Thus, when the soft brush bristles detach from the stitch, there is a certain gap between the fabric and the thread, making the tension of the fabric and the thread more suitable, thereby greatly reducing the degree of wrinkling. In addition, when using this device to sew elastic fabric, the soft brush bristles can fill the gap between the fabric and the thread, so that there is a certain gap between the elastic fabric and the thread. The existence of the gap makes it less likely that the thread will be too tight after the elastic fabric is sewn, so that the elastic fabric can still maintain its own elasticity (extensibility) at the seam after sewing. Attached Figure Description

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a sewing machine presser foot provided in an embodiment of the present invention; Figure 2 yes Figure 1Explosion diagram in the embodiment; Figure 3 This is a schematic diagram of the structure of the pressing surface of a sewing machine presser foot provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the brush structure in another embodiment provided by the present invention; Figure 5 This is a schematic diagram of the structure of the first presser foot and the second presser foot of a sewing machine in one embodiment provided by the present invention; Figure 6 yes Figure 5 Explosion diagram in the embodiment; Figure 7 This is a schematic diagram of the support groove of the sewing machine presser foot in one embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the presser foot abutting surface of a sewing machine in one embodiment of the present invention; Figure 9 This is a schematic diagram of a brush mounted on the second pressure foot in one embodiment of the present invention.

[0017] The labels for the attached figures are as follows: 10. Presser foot seat; 101. Clamping surface; 102. Top surface; 103. Mounting groove; 104. Threaded hole; 105. Support groove; 11. Connecting post; 111. Threaded section; 112. Sleeving section; 12. First presser foot part; 13. Second presser foot part; 20. Brush; 21. Mounting base; 211. Rotating shaft; 22. Soft brush bristle layer; 30. Needle bar; a. The movement path of the needle bar. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] This invention provides a sewing machine presser foot, see [link / reference]. Figures 1 to 9The system includes a presser foot 10 and a brush 20. The brush 20 includes a mounting base 21 and a soft bristle layer 22. The mounting base 21 is rotatably connected to the presser foot 10. The soft bristle layer 22 includes soft bristles distributed circumferentially along the mounting base 21. During sewing, when the needle bar 30 is lowering the needle, the presser foot 10 presses the fabric down, and the soft bristle layer 22 is located on the movement path a of the needle bar 30, so that the needle bar 30 carries the thread through the soft bristle layer 22 and then into the fabric. When the needle bar 30 is raising the needle, the soft bristle layer 22 rotates in response to the movement of the fabric. The soft bristles distributed circumferentially along the mounting base 21 form the soft bristle layer 22. The specific number of soft bristles can be set according to actual needs, as long as a layered structure of a certain thickness is formed circumferentially around the mounting base 21. The thickness of the soft bristle layer 22 can be adjusted according to actual conditions. If a thicker thickness is required, it can be adjusted by increasing the number of soft bristles. The soft bristle layer 22 can be set as follows: Figures 1 to 9 The disc-shaped or other shapes shown are designed to ensure that after the soft bristle layer 22 rotates relative to the presser foot 10, it remains on the movement path a of the needle bar 30 during its periodic needle insertion phase. This allows the outer needle bar 30 to carry the thread through the soft bristle layer 22 and into the fabric. The soft bristles have a certain degree of flexibility, so as the outer needle bar 30 passes through the soft bristle layer 22, the bristles are squeezed outwards to ensure that the outer needle bar 30 can pass through the soft bristle layer 22. The soft bristle layer 22 is mounted on the mounting base 21, so that when the mounting base 21 rotates relative to the presser foot 10, the soft bristle layer 22 can also rotate.

[0020] When a sewing machine is sewing fabric, one end of the thread is connected to the fabric. The needle bar 30 has a needle hole, through which the thread passes. During the needle bar 30's down-needle phase, the presser foot 10 presses the fabric down. The soft brush layer 22 is located on the movement path a of the needle bar 30, so that the needle bar 30 carries the thread through the soft brush layer 22 and then into the fabric to form a stitch (a stitch refers to a single line segment of the thread from one needle eye to an adjacent needle eye). During the needle bar 30's up-needle phase, the needle bar 30 returns in the opposite direction from the original down-needle movement path, the presser foot 10 is lifted, and after the fabric moves a certain distance, the presser foot 10 presses the fabric down again to proceed to the next down-needle phase. This process is repeated cyclically to sew the fabric. During the sewing process, one end of the thread is connected to the fabric, and the needle bar 30 is on the thread segment. Therefore, when the soft bristle layer 22 is located on the movement path a of the needle bar 30, the thread segment between the fabric and the needle bar 30 will pass through the soft bristle layer 22, thus the thread comes into contact with the soft bristle layer 22. Consequently, the soft bristle layer 22 will rotate in response to the movement of the fabric. Since the soft bristle layer 22 is formed by soft bristles distributed circumferentially along the mounting base 21, after the soft bristle layer 22 rotates, in the next stitch stage, another position of the soft bristle layer 22 can still be on the movement path of the needle bar 30, allowing the needle bar 30 to carry the thread through in the next stitch stage. Two needle insertion stages can form two adjacent needle holes. When the two adjacent needle holes form a stitch, the needle bar 30 carries the thread through the soft bristle layer 22 twice. Due to the rotation of the soft bristle layer 22, the positions where the needle bar 30 carries the thread through the soft bristle layer 22 are at different positions in the rotation direction of the soft bristle layer 22. Thus, when the stitch is formed on the fabric, the soft bristles on the soft bristle layer 22 can fill the gap between the fabric and the thread in the two adjacent needle holes to form an isolation gap between the fabric and the thread. During the movement of the fabric, both the fabric and the thread in the stitch can act on the soft bristles, thereby driving the soft bristle layer 22 to rotate, so that the soft bristles between the fabric and the thread in the two adjacent needle holes can detach. The soft brush layer 22 fills the gap between the fabric and thread between two adjacent needle holes, providing support for the fabric and thread within the area of ​​two adjacent needle holes. This ensures that when the soft brush layer 22 rotates and disengages from the area of ​​two adjacent needle holes, a certain gap remains between the fabric and thread, allowing for a more suitable tension and thus minimizing wrinkles. Similarly, when sewing elastic fabrics with good extensibility, the brush 20 creates a gap between the elastic fabric and thread. This gap prevents the thread from becoming too tight after the elastic fabric is sewn, allowing the elastic fabric to maintain its elasticity (extensibility) at the seam.

[0021] This embodiment provides a sewing machine presser foot that can be a single-sided presser foot, a double-sided presser foot, a high-low presser foot, or other components with sewing machine presser foot functions. A single-sided presser foot refers to applying pressure only on one side of the fabric; see [link to documentation]. Figures 1 to 3In the embodiment of a single-sided presser foot, the mounting base 21 is rotatably connected to the presser foot base 10. A double-sided presser foot refers to applying pressure simultaneously to both sides of the fabric; see [link to documentation]. Figures 5 to 9 In the embodiment of the double-sided presser foot, the brush 20 can be installed on one of the presser feet as needed (i.e., the mounting base 21 of the brush 20 can be rotatably connected to the first presser foot 12 or the second presser foot 13 as needed) to achieve the same effect. High and low presser feet are adapted to fabrics of different thicknesses by adjusting the pressure intensity or through structural design. In the embodiment of the high and low presser foot, the brush 20 can also be installed on one of the presser feet as needed, which will not be elaborated here.

[0022] In one embodiment, see Figures 1 to 3 The presser foot base 10 is provided with a connecting post 11, and the mounting base 21 is sleeved on the connecting post 11 to be rotatably connected to the presser foot base 10. Thus, by sleeved on the connecting post 11 to form a rotatable connection structure with the presser foot base 10, the brush 20 can be rotatably connected to the presser foot base 10. Specifically, the connecting post 11 can be integrally formed into the presser foot base 10 (not shown in the figure). After the mounting base 21 is sleeved on the connecting post, it can be threadedly connected to the other end of the connecting post 11 with a nut, thereby preventing the mounting base 21 from detaching from the connecting post 11. In other embodiments, the connecting post can be a screw or rivet, and the mounting base 21 is installed on the presser foot base 10 by screws or rivets, with the mounting base 21 sleeved on the shank of the screw or rivet to ensure that the mounting base 21 can rotate relative to the presser foot base 10.

[0023] In one embodiment, see Figures 1 to 3 The presser foot 10 is provided with a pressing surface 101 for pressing against the sewing material and a top surface 102 opposite to the pressing surface 101. A mounting groove 103 is formed between the pressing surface 101 and the top surface 102. One end of the connecting post 11 is connected to the top surface 102, and the other end of the connecting post 11 extends into the mounting groove 103. The mounting seat 21 is sleeved on the other end of the connecting post 11. The soft bristle layer 22 extends out from the mounting groove 103 and extends to the movement path of the needle bar 30. Thus, the mounting seat 21 is sleeved on the other end of the connecting post 11, that is, the mounting seat 21 is sleeved on the connecting post 11 and close to the pressing surface 101. Therefore, during the sewing process, the soft bristle layer 22 is closer to the sewing material, and the soft bristles filling the space between the thread and the sewing material are more compact. The soft bristles are less likely to bend excessively due to being too far from the sewing material. One end of the connecting post 11 is connected to the top surface 102, and the other end of the connecting post 11 extends into the mounting groove 103. That is to say, most of the connecting post 11 is located in the mounting groove 103, which provides a certain degree of protection for the connecting post 11 and the soft brush layer 22.

[0024] In one embodiment, see Figure 1 and Figure 2The connecting post 11 includes a threaded section 111 and a sleeve section 112. The top surface 102 has a threaded hole 104 that is threadedly connected to the threaded section 111. The sleeve section 112 extends into the mounting groove 103, and the mounting seat 21 is sleeved on the sleeve section 112. Thus, the connecting post 11, through the threaded connection between the threaded section 111 and the threaded hole 104, allows for easy connection of the mounting seat 21 to the presser foot seat 10 or removal of the mounting seat 21 from the presser foot seat 10 to replace brushes 20 of different sizes or thicknesses. The depth of the connecting post 11 extending into the mounting groove 103 can also be adjusted by adjusting the screw depth of the threaded section 111, thereby adjusting the height of the brush 20 relative to the fabric. Specifically, the outer diameter of the sleeve section 112 can be smaller than the diameter of the threaded hole 104, so that the sleeve section 112 of the connecting post 11 can pass through the threaded hole 104 and extend into the mounting groove 103. The head of the threaded section 111 can be set as an internal hex head or a screw head (not shown in the figure) to facilitate the screwing of the threaded section 111 into the threaded hole 104.

[0025] In one embodiment, the brush 20 further includes a pad (not shown) that can be sandwiched between the mounting base 21 and the presser foot base 10. This pad increases the mounting height between the brush 20 and the presser foot base 10, thereby adjusting the height of the brush 20 relative to the fabric. This results in a larger gap created by the soft brush bristles filling the stitches after the needle bar 30 carries the thread through the soft bristle layer 22 and into the fabric, forming a stitch between adjacent needle holes. The position of the pad can be adjusted according to actual needs, thus making the tightness of the fabric and thread more suitable.

[0026] In one embodiment, see Figure 4 The mounting base 21 is provided with a rotating shaft portion 211, and the pressure foot base 10 has a receiving groove for mounting the mounting base 21 and a rotating shaft hole (not shown in the figure) that is adapted to the rotating shaft portion 211. Thus, the structure of the brush 20 rotating relative to the pressure foot base 10 is realized by the cooperation of the rotating shaft portion 211 and the rotating shaft hole.

[0027] In one embodiment, see Figures 5 to 9The presser foot 10 provided in this embodiment of the invention includes a first presser foot portion 12 and a second presser foot portion 13, which are spaced apart. A mounting base 21 is rotatably connected to either the first presser foot portion 12 or the second presser foot portion 13. The outer periphery of the soft bristle layer 22 extends into the gap between the first presser foot portion 12 and the second presser foot portion 13. Therefore, when using the presser foot 10 provided in this embodiment of the invention, the gap between the first presser foot portion 12 and the second presser foot portion 13 is aligned with the movement path a of the external needle bar 30, allowing the external needle bar 30 to pass through the soft bristle layer 22 and into the fabric for sewing. The mounting base 21 can be selectively rotatably connected to either the first presser foot portion 12 or the second presser foot portion 13, enabling a rotatable connection between the mounting base 21 and the presser foot 10. See also... Figure 8 When sewing fabric, the first presser foot 12 and the second presser foot 13 are provided with pressing surfaces 101 to press the fabric, so that when the external needle bar 30 sews the fabric along the movement path a, the fabric on both sides of the stitch can be pressed when the stitch is formed, and the seam of the fabric is not easy to shift during the sewing process.

[0028] In one embodiment, see Figure 7 and Figure 9 The first presser foot 12 and the second presser foot 13 are respectively rotatably connected to the mounting base 21, and the other has a support groove 105 on the side facing the mounting base 21. The outer periphery of the soft brush layer 22 extends into the support groove 105. See Figure 7 The first presser foot 12 is rotatably connected to the mounting base 21. The second presser foot 13 has a support groove 105 on the side facing the mounting base 21. The support groove 105 supports the soft bristle layer 22. By reasonably setting the support groove 105 and the outer periphery extension length of the soft bristle layer 22, even if the soft bristles on the soft bristle layer 22 are clamped and filled within the stitch area, the soft bristles are not easily pressed below the second presser foot 13. In another embodiment, see Figure 9 The second presser foot 13 is rotatably connected to the mounting base 21, and the first presser foot 12 has a support groove 105 on the side facing the mounting base 21.

[0029] In one embodiment, both the first presser foot 12 and the second presser foot 13 are provided with a mounting structure for rotatably connecting to the mounting base 21. The mounting base 21 is detachably mounted to the first presser foot 12 and the second presser foot 13. Since both the first presser foot 12 and the second presser foot 13 are provided with a mounting structure for rotatably connecting to the mounting base 21 (not shown in the figure), the brush 20 can be selectively mounted on either the first presser foot 12 or the second presser foot 13, thus adapting to different sewing scenarios. Simultaneously, the detachable design allows for easy replacement of new brushes 20 or brushes 20 with different soft bristle layer 22 thicknesses. The second presser foot 13 is provided with a mounting structure for rotatably connecting to the mounting base 21, which can be referred to as the rotatable connection structure of the mounting base 21 on the presser foot base 10, and will not be described in detail here.

[0030] In one embodiment, a sewing machine includes a presser foot bar and a sewing machine presser foot as described above, the presser foot being disposed on the presser foot bar. Thus, by using the sewing machine presser foot provided in this embodiment on the sewing machine, when sewing fabric, as the two needles form a stitch, soft bristles fill the stitch, filling the gap between the fabric and the thread, providing some support to the fabric and thread. Therefore, when the soft bristles detach from the stitch, a certain gap remains between the fabric and the thread, allowing for a more suitable fit between the fabric and the thread, thereby significantly reducing wrinkles and maintaining the elasticity (extensibility) of the fabric at the seam after sewing elastic fabric.

[0031] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. A sewing machine presser foot, characterized in that: The device includes a presser foot base and a brush. The brush includes a mounting base and a soft bristle layer. The mounting base is rotatably connected to the presser foot base. The soft bristle layer includes soft bristles distributed circumferentially along the mounting base. During the sewing process, in the needle insertion phase, the presser foot presses the fabric, and the soft bristle layer is located on the movement path of the needle bar, so that the needle bar carries the thread through the soft bristle layer and then into the fabric; in the needle lifting phase, the soft bristle layer rotates in response to the movement of the fabric.

2. The sewing machine presser foot according to claim 1, characterized in that, The presser foot seat is provided with a connecting post, and the mounting seat is sleeved on the connecting post to be rotatably connected to the presser foot seat.

3. The sewing machine presser foot according to claim 2, characterized in that, The presser foot seat is provided with a pressing surface for pressing the sewing material and a top surface opposite to the pressing surface. An installation groove is provided between the pressing surface and the top surface. One end of the connecting post is connected to the top surface, and the other end of the connecting post extends into the installation groove. The mounting seat is sleeved on the other end of the connecting post. The soft brush layer extends out from the installation groove and extends to the movement path of the needle bar.

4. The sewing machine presser foot according to claim 3, characterized in that, The connecting column includes a threaded section and a sleeved section. The top surface has a threaded hole that is threadedly connected to the threaded section. The sleeved section extends into the mounting groove, and the mounting seat is sleeved on the sleeved section.

5. The sewing machine presser foot according to claim 2, characterized in that, The brush also includes a gasket sandwiched between the mounting base and the presser foot base.

6. The sewing machine presser foot according to claim 1, characterized in that, The mounting base is provided with a rotating shaft, and the pressure foot base has a receiving groove for mounting the mounting base and a rotating shaft hole that is adapted to the rotating shaft.

7. The sewing machine presser foot according to any one of claims 1-6, characterized in that, The presser foot base includes a first presser foot portion and a second presser foot portion, the first presser foot portion and the second presser foot portion are spaced apart, the mounting base is rotatably connected to the first presser foot portion or the second presser foot portion, and the end of the outer periphery of the soft bristle layer extends to the gap between the first presser foot portion and the second presser foot portion.

8. The sewing machine presser foot according to claim 7, characterized in that, The first presser foot and the second presser foot are rotatably connected to the mounting base, and the other has a support groove on one side facing the mounting base, with the outer end of the soft bristle layer extending into the support groove.

9. The sewing machine presser foot according to claim 7, characterized in that, Both the first presser foot and the second presser foot are provided with a mounting structure for rotatably connecting to the mounting base, and the mounting base is detachably mounted on the first presser foot and the second presser foot.

10. A sewing machine, characterized in that, It includes a presser foot bar and a sewing machine presser foot as described in any one of claims 1-9, wherein the sewing machine presser foot is disposed on the presser foot bar.

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