Presser foot assembly of sewing machine

Abstract

The utility model provides a presser foot assembly of a sewing machine, and belongs to the technical field of machinery. The problem of combination of a sewing machine and a bead scattering device in the prior art is solved. The presser foot assembly of the sewing machine comprises a support and a pressing plate connected to the lower portion of the support, the pressing plate comprises a flat-plate-shaped plate body, the lower portion of the pressing plate is a flat extrusion face, the upper portion of the pressing plate is provided with a protruding hinge portion, the hinge portion is hinged to the lower end of the support through a pin shaft, and the two ends of the plate body are each provided with a guide portion in smooth transition. A concave guide notch is further formed in the side portion of the plate body, an elastic pre-tightening structure is arranged between the support and the hinge portion, and the extrusion face of the plate body tends to abut against the sewing platform under the action of the elastic pre-tightening structure. The presser foot assembly of the sewing machine is high in stability, solves the matching problem of the sewing machine and the bead scattering machine, and is simpler to operate.

Description

Technical Field

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

[0002] A sewing machine is a mechanical device used to join fabric or other materials together with needle and thread. It greatly improves sewing efficiency and quality, and is an indispensable tool in garment manufacturing, home sewing, and various industrial applications.

[0003] Sew decorative elements onto the fabric effectively enhances its aesthetic appeal. These decorative elements are then fed systematically to the sewing machine via a bead-feeding device. It is evident that the sewing machine and the bead-feeding device must work in concert to achieve stable decorative element sewing.

[0004] In existing sewing machines, decorative parts are directly fed to the presser foot assembly. Since the decorative parts need to be sewn immediately after being separated from the bead distribution device, the distance between the bead distribution device and the presser foot assembly is relatively close. During operation, the bead distribution device and the presser foot assembly may affect each other, resulting in poor stability. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a presser foot assembly for a sewing machine suitable for sewing fabrics with decorative beads.

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

[0007] A presser foot assembly for a sewing machine, the sewing machine including a frame and a sewing platform located on the frame, the presser foot assembly being connected to the frame and located at the upper part of the sewing platform, the presser foot assembly including a bracket and a pressure plate connected to the lower part of the bracket, characterized in that the pressure plate includes a flat plate body, the lower part of the pressure plate being a flat pressing surface, the upper part of the pressure plate having a protruding hinge portion, the hinge portion being hinged to the lower end of the bracket by a pin, both ends of the plate body having smoothly transitioned guide portions, the side of the plate body also having a recessed guide notch, the bracket and the hinge portion having an elastic pre-tightening structure, under the action of the elastic pre-tightening structure, the pressing surface of the plate body tends to abut against the sewing platform.

[0008] In the presser foot assembly of the sewing machine described above, the guide portion includes a front guide portion and a rear guide portion, which are located at both ends of the plate body, respectively.

[0009] In the presser foot assembly of the sewing machine described above, both the front guide and the rear guide are arc-shaped, and the ends of both the front guide and the rear guide are located on the upper part of the plate.

[0010] In the presser foot assembly of the sewing machine described above, the arc length of the front guide portion is greater than the arc length of the rear guide portion.

[0011] In the presser foot assembly of the sewing machine described above, the guide notch is located on the side of the plate between the front guide portion and the hinge portion.

[0012] In the presser foot assembly of the sewing machine described above, the lower part of the bracket has a recessed positioning hole, and a spring is located at the positioning hole. The upper end of the spring is embedded in the positioning hole, and the lower end of the spring abuts against the plate. The spring is located on the plate between the hinge part and the rear guide part.

[0013] In the presser foot assembly of the sewing machine described above, the spring is a conical spring, and the outer diameter of the upper end of the spring is smaller than that of the lower end.

[0014] In the presser foot assembly of the sewing machine described above, the depth of the guide notch is 2 / 3 to 4 / 5 of the width of the plate.

[0015] In the presser foot assembly of the sewing machine described above, the guide recess is adjacent to the hinge portion.

[0016] In the presser foot assembly of the sewing machine described above, the hinge part includes hinge pieces that protrude upwards on both sides of the plate, and the lower end of the bracket is embedded between the two hinge pieces and the bracket is hinged to the two hinge pieces by a pin.

[0017] Compared with existing technologies, the presser foot assembly of this sewing machine has a guide recess on the presser plate for guiding decorative parts. The guide recess extends from one side of the plate to the middle. After the decorative parts discharged from the conveyor assembly enter the guide recess, they can stably enter the set sewing position on the sewing platform. Therefore, this not only improves the sewing stability between the decorative parts and the fabric, but also keeps the conveyor assembly as far away from the presser foot assembly as possible, avoiding mutual interference between the two components, further improving its stability and making it highly practical. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a sewing machine with this presser foot assembly.

[0019] Figure 2 This is a three-dimensional structural diagram of the presser foot assembly of this sewing machine.

[0020] Figure 3 This is a cross-sectional structural diagram of the presser foot assembly of this sewing machine.

[0021] In the figure, 3 is the bracket; 3a is the positioning hole; 4 is the pressure plate; 4a is the extrusion surface; 4b is the front guide part; 4c is the rear guide part; 4d is the hinge part; 4d1 is the hinge piece; 4e is the guide notch; 4f is the plate; 5 is the spring; and 6 is the pin. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that when a component is said to be "mounted on" another component, it can be directly mounted on the other component or may be interspersed with a component. When a component is said to be "set on" another component, it can be directly set on the other component or may be interspersed with a component. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or may be interspersed with a component.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] like Figure 1 and Figure 2 and Figure 3 As shown, the sewing machine includes a frame 1 and a sewing platform 2 located on the frame 1. The presser foot assembly is connected to the frame 1 and is located on the upper part of the sewing platform 1. The presser foot assembly includes a bracket 3 and a pressure plate 4 connected to the lower part of the bracket 3.

[0026] The pressure plate 4 includes a flat plate body 4f. The lower part of the pressure plate 4f is a flat pressing surface 4a. The upper part of the pressure plate 4 has a protruding hinge part 4d. The hinge part 4d is hinged to the lower end of the bracket 3 by a pin 6. Both ends of the plate body 4f have smoothly transitioned guide parts. The side of the plate body 4f also has a recessed guide notch 4e. There is an elastic pre-tightening structure between the bracket 3 and the hinge part 4d. Under the action of the elastic pre-tightening structure, the pressing surface 4a of the plate body 4f tends to abut against the sewing platform 2.

[0027] Under the action of the elastic pre-tightening component, the pressure plate 4 tends to abut against the sewing platform 2, and the fabric at the sewing platform 2 can be stably pressed between the pressure plate 4 and the sewing platform 2.

[0028] Because the preload of spring 5 is limited, the fabric can pass smoothly through the presser foot assembly under external force. Of course, the main function of the presser foot assembly is to flatten the fabric on the sewing platform 2, ensuring that the decorative parts can be stably sewn onto the fabric.

[0029] The output end of the conveying component is connected to the port of the guide notch 4e. Therefore, the decorative piece discharged from the conveying component enters the guide notch 4e, which allows the decorative piece to enter the set seam of the fabric stably.

[0030] It can be seen that even if the conveying component is far from the presser foot component, the decorative part can still be stably inserted into the presser foot component under the action of the guide notch 4e.

[0031] The guide section includes a front guide section 4b and a rear guide section 4c, which are located at both ends of the plate 4f, respectively.

[0032] When the fabric enters the presser foot assembly, it first passes through the front guide section 4b. After the decorative parts and fabric are sewn together, the sewn fabric is smoothly discharged from the rear guide section 4c.

[0033] The front guide section 4b and the rear guide section 4c are designed to prevent the fabric from getting stuck between the fabric and the presser foot assembly, thereby improving the smoothness of the fabric passing through the presser foot assembly.

[0034] Both the front guide portion 4b and the rear guide portion 4c are arc-shaped, and the ends of both the front guide portion 4b and the rear guide portion 4c are located on the upper part of the plate 4f.

[0035] The arc length of the front guide portion 4b is greater than the arc length of the rear guide portion 4c.

[0036] Since the fabric is most prone to jamming with the front guide part 4b, the front guide part 4b with a larger arc length can effectively prevent jamming.

[0037] The guide notch 4e is located on the side of the plate 4f between the front guide part 4b and the hinge part 4d.

[0038] Because the strength at the hinge 4d is relatively high, this ensures that the entire presser foot assembly has sufficient strength.

[0039] The lower part of the bracket 3 has a recessed positioning hole 3a, and a spring 5 is located at the positioning hole 3a. The upper end of the spring 5 is embedded in the positioning hole 3a, and the lower end of the spring 5 abuts against the plate 4f. The spring 5 is located at the plate 4f between the hinge part 4d and the rear guide part 4c.

[0040] Under the elastic force of spring 5, the front guide part 4b can be guaranteed to have a slight upward tendency, and the fabric is mainly pressed against the sewing platform 2 by the plate 4f at the rear guide part 4c.

[0041] This structure not only positions the fabric, but also ensures that the fabric does not encounter much resistance when passing through the presser foot assembly, allowing the sewn fabric to pass stably through the presser foot assembly.

[0042] The spring 5 is a conical spring, and the outer diameter of the upper end of the spring 5 is smaller than that of the lower end.

[0043] The depth of the guide notch 4e is 2 / 3 of the width of the plate 4f. Depending on the actual situation, a depth of 4 / 5 of the width of the plate 4f is also feasible.

[0044] This structure ensures that the plate 4f has sufficient strength while also allowing the decorative parts to stably enter the set position of the sewing platform 2.

[0045] The guide notch 4e is adjacent to the hinge portion 4d.

[0046] The hinge portion 4d includes hinge pieces 4d1 that protrude upwards on both sides of the plate 4f. The lower end of the bracket 3 is embedded between the two hinge pieces 4d1, and the bracket 3 and the two hinge pieces 4d1 are hinged by a pin 6.

[0047] The gap between the lower end of the bracket 3 and the two hinge pieces 4d1 is matched, and under the action of the pin 6, the entire pressure plate 4 can be stably hinged to the lower end of the bracket 3.

[0048] The presser foot assembly of this sewing machine features a guide recess on the presser plate for guiding decorative parts. This guide recess extends from one side of the plate to the center. After the decorative parts discharged from the conveyor assembly enter the guide recess, they can stably enter the set seam on the sewing platform. Therefore, this not only improves the sewing stability between the decorative parts and the fabric, but also keeps the conveyor assembly as far away from the presser foot assembly as possible, avoiding mutual interference between the two components, further enhancing its stability and making it highly practical.

[0049] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A presser foot assembly of a sewing machine, the sewing machine including a machine frame and a sewing platform located on the machine frame, the presser foot assembly being connected to the machine frame and the presser foot assembly being located at an upper portion of the sewing platform, the presser foot assembly including a support and a presser plate connected to a lower portion of the support, characterized in that, The pressure plate includes a flat plate body with a flat extrusion surface at the bottom and a protruding hinge at the top. The hinge is hinged to the lower end of the support by a pin. Both ends of the plate body have smoothly transitioning guide portions, and the side of the plate body also has a recessed guide notch. There is an elastic pre-tightening structure between the support and the hinge. Under the action of the elastic pre-tightening structure, the extrusion surface of the plate body tends to abut against the sewing platform.

2. The presser foot assembly of a sewing machine according to claim 1, wherein The guide section includes a front guide section and a rear guide section, which are located at both ends of the plate.

3. The presser foot assembly of the sewing machine according to claim 2, characterized in that, Both the front guide section and the rear guide section are arc-shaped, and the ends of both the front guide section and the rear guide section are located on the upper part of the plate.

4. The presser foot assembly of a sewing machine according to claim 3, wherein The arc length of the front guide portion is greater than the arc length of the rear guide portion.

5. The presser foot assembly of a sewing machine according to claim 4, wherein The guide notch is located on the side of the plate between the front guide part and the hinge part.

6. The presser foot assembly of a sewing machine according to claim 5, wherein The lower part of the bracket has a recessed positioning hole, and a spring is located at the positioning hole. The upper end of the spring is embedded in the positioning hole, and the lower end of the spring abuts against the plate. The spring is located on the plate between the hinge part and the rear guide part.

7. The presser foot assembly of a sewing machine according to claim 6, wherein The spring is a conical spring, and the outer diameter of the upper end of the spring is smaller than that of the lower end.

8. The presser foot assembly of a sewing machine according to claim 7, wherein The depth of the guide notch is 2 / 3 to 4 / 5 of the width of the plate.

9. The presser foot assembly of a sewing machine according to claim 8, wherein The guide notch is adjacent to the hinge portion.

10. The presser foot assembly of a sewing machine according to claim 9, wherein The hinge portion includes hinge pieces that protrude upwards on both sides of the plate. The lower end of the bracket is embedded between the two hinge pieces, and the bracket and the two hinge pieces are hinged by a pin.

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