Thread separating piece, thread trimming mechanism and sewing machine

Abstract

The thread separating piece is used for being matched with a first thread trimmer and a second thread trimmer of the thread trimming mechanism of the sewing machine to trim threads, the thread separating piece comprises a thread separating piece, the end, facing the second thread trimmer, of the thread separating piece is an A side end when the thread separating piece is installed in the sewing machine, and the other end of the thread separating piece is a B side end. A guide slope extending towards the B side end to the outer arc face of the thread separating piece is arranged on the side face of the right side edge of the thread separating piece, the guide slope is a smooth transition face, and when the thread separating piece is installed in the sewing machine, the guide slope is opposite to a thread separating tip on a second thread trimmer moving towards the first thread trimmer.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing equipment technical field, concretely relates to a line separating piece, a thread cutting mechanism and a sewing machine. BACKGROUND

[0002] The line separating piece in the thread cutting mechanism of the conventional sewing machine is an auxiliary thread cutting device, which has good elasticity and functions to assist the thread cutting mechanism to better separate the thread when cutting the thread. If the position of the thread end of the bottom thread is not controlled after the thread is cut by the flat sewing machine, the bottom thread may fall in any direction, which may result in that a plurality of stitches cannot form stitches when sewing, and the bottom thread cannot be raised in the sewing process, or the thread cannot be raised in the sewing process, thereby affecting the sewing work. The utility model patent with the application number CN202220259051.6 provides a thread cutting mechanism, which adopts a bottom thread capturing technology, and the bottom thread capturing piece with the arc-shaped capturing piece is arranged to capture the bottom thread. The first capturing part on the first thread cutting knife and the first capturing part on the outer arc surface of the arc-shaped capturing piece are matched with each other to stabilize the position of the thread end of the bottom thread after the thread is cut, and the bottom thread is captured. The arc-shaped capturing piece in the utility model patent is also a line separating piece, and the thread separating tip part on the second thread cutting knife is inserted into the thread loop and matched with the arc-shaped capturing piece. The arc-shaped capturing piece further separates the thread, and also has the function of capturing the bottom thread after the thread cutting is completed. Because the line separating piece is made of a high-toughness and high-strength elastic material, it can not be deformed during the long-term execution of the thread cutting and bottom thread capturing actions. However, due to the design, the line separating piece and the first thread cutting knife cooperate to capture the bottom thread, and there is a certain adhesion between them. When the sewing machine does not execute the thread cutting action, the line separating piece can maintain good stability. When the sewing machine starts to cut the thread, the force of the arc-shaped capturing piece abutting against the first thread cutting knife is released, and the sewing machine itself has a certain degree of vibration. The arc-shaped capturing piece and the second thread cutting knife may vibrate slightly during thread cutting. In addition, the space of the thread cutting mechanism is small, so the thread separating tip part on the second thread cutting knife may collide with the side surface of the arc-shaped capturing piece during thread cutting, so that the first thread cutting knife and the second thread cutting knife cannot cut the thread smoothly. For the line separating piece without the function of capturing the bottom thread, similar problems also exist, and there is a risk of collision. CONTENT OF THE UTILITY MODEL

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a line separating piece, a thread cutting mechanism and a sewing machine, which can avoid the collision between the line separating piece and the side surface of the second thread cutting knife during thread cutting, and ensure that the thread can be cut smoothly and the bottom thread can be captured.

[0004] To achieve the above object, the utility model provides a line separating piece for cooperating first thread cutting knife and second thread cutting knife of thread cutting mechanism of sewing machine to cut thread, including line separating piece, the line separating piece is installed in sewing machine and the end towards second thread cutting knife is A side end, the other end is B side end, the line separating piece is equipped with the guide slope surface extending to the line separating piece outer arc surface from the side surface of right side edge B side end, and the guide slope surface is the face of smooth transition, the line separating piece is installed in sewing machine and the guide slope surface is opposite the line separating tip part on second thread cutting knife moving towards first thread cutting knife.

[0005] Further, the thickness of the line separating piece is 0.3-2mm, and the thickness of the section of the right side edge of the line separating piece at the guide slope surface is 0.1-1.8mm.

[0006] Further, the right side edge of the line separating piece has a guide side edge part that gradually extends to the right along a direction from the A side end to the B side end.

[0007] The utility model also provides a sewing machine for cutting thread at a rotating hook of the sewing machine, comprising a first thread cutting knife and a second thread cutting knife, the first thread cutting knife is fixedly installed at an outer circumferential side of the rotating hook, the second thread cutting knife is arranged at the outer circumferential side of the rotating hook and can rotate around the rotating hook to engage with the second thread cutting knife or separate, further comprising the above line separating piece, and the line separating piece of the line separating piece is located between the rotating hook and the first thread cutting knife.

[0008] Further, the side surface of the first thread cutting knife towards the rotating hook is provided with a first capturing part, and the outer arc surface of the line separating piece is provided with a second capturing part matched with the first capturing part; an abutment side surface is arranged between the left side of the guide slope surface and the outer arc surface of the line separating piece, and the left side of the abutment side surface is the second capturing part.

[0009] Further, the projection of the abutment side surface on a horizontal plane extends along a straight line, and the included angle θ between the extension direction and the front-rear direction of the sewing machine is -60°-60°.

[0010] Further, the line separating piece comprises a mounting part for fixedly connecting in the sewing machine, the B side end of the line separating piece is fixedly connected with the mounting part, the mounting part is provided with a positioning side edge, and the projection of the abutment side surface on the horizontal plane is parallel to the positioning side edge.

[0011] Further, the length L of the guide slope surface in the front-rear direction of the sewing machine is 1-5mm.

[0012] Further, the width W of the guide slope surface in the left-right direction of the sewing machine is 1-8mm.

[0013] The utility model also provides a sewing machine, comprising a rotating hook, further comprising the above thread cutting mechanism, the thread cutting mechanism is arranged at the rotating hook to cut thread.

[0014] The thread separating piece, the thread shearing mechanism and the sewing machine have the following beneficial effects:

[0015] The thread separating piece has the guiding slope surface, and the thread separating tip of the second thread shearing cutter is guided to smoothly enter the outside arc surface of the thread separating piece through the guiding slope surface when shearing the thread, so that the second thread shearing cutter can smoothly drive the top thread and the bottom thread to enter the first thread shearing cutter, and the thread shearing is smoothly achieved, the sewing machine is stably and smoothly worked, and the design structure is simple and convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure schematic view of the thread shearing mechanism of the utility model.

[0017] Figure 2 It is a structure schematic view of the first thread shearing cutter, the second thread shearing cutter and the thread separating piece in the utility model.

[0018] Figure 3 It is a structure schematic view of the thread separating piece in the utility model.

[0019] Figure 4 It is a structure schematic view of the thread separating piece in the utility model.

[0020] Figure 5 It is a structure schematic view of the second thread shearing cutter in the utility model.

[0021] Figure 6 It is a structure schematic view of the first thread shearing cutter in the utility model.

[0022] Figure 7 It is a working schematic view of the second thread shearing cutter when being close to the first thread shearing cutter in the utility model.

[0023] Figure 8 It is Figure 7 a top view.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1 first thread shearing cutter

[0026] 101 first capture part

[0027] 2 second thread shearing cutter

[0028] 201 thread shearing hook

[0029] 202 thread separating tip

[0030] 3 wire branching member

[0031] 301 mounting portion

[0032] 302 wire branching piece

[0033] 303 second capturing portion

[0034] 304 guide slope surface

[0035] 305 connecting side surface

[0036] 306 guide side edge portion

[0037] 307 positioning side edge

[0038] 4 rotating shuttle DETAILED DESCRIPTION

[0039] The implementation of the present application will be described by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0040] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the specification are only used to understand and read the content disclosed in the specification by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like used in the specification are only for easy understanding and clarity, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0041] Reference Figures 1 to 8The utility model provides a kind of line dividing part 3, as the part of thread cutter of sewing machine, for cooperating the first thread cutter 1 and second thread cutter 2 of thread cutter of sewing machine to carry out thread cutting, line dividing part 3 includes line dividing piece 302, thread cutter is used to be set at thread cutter of sewing machine and carry out thread cutting, thread cutter includes first thread cutter 1, second thread cutter 2 and line dividing part 3, first thread cutter 1 is fixedly installed at the outer circumferential side of thread cutter 4, second thread cutter 2 is set at the outer circumferential side of thread cutter 4 and can rotate around thread cutter 4 to be engaged with second thread cutter 2 or separate, second thread cutter 2 is equipped with the thread cutting hook 201 for driving bottom thread to the movement towards first thread cutter 1, and is equipped with the line dividing tip 202 for being inserted between bobbin thread loop and carrying out line division, line dividing tip 202 is located right side of thread cutting hook 201, line dividing part 3 includes the line dividing piece 302 arranged along the outer circumferential side of thread cutter 4, line dividing piece 302 is between thread cutter 4 and first thread cutter 1, line dividing piece 302 is set as arc, wherein line dividing part 3 is fixedly installed at the suitable position of sewing machine by mounting portion 301. First thread cutter 1, second thread cutter 2 and line dividing part 3 can all use existing design.In the utility model, the end of line dividing piece 302 towards second thread cutter 2 is A side end, the other end is B side end, line dividing piece 302 is equipped with the guide slope surface 304 extending to the outer arc surface of line dividing piece 302 from the side surface of its right side edge towards B side end, and guide slope surface 304 is the face of smooth transition, specifically can be curved surface or plane;Second thread cutter 2 moves towards first thread cutter 1, and line dividing tip 202 is opposite to guide slope surface 304.

[0042] The main working principle of the thread cutting mechanism containing the thread separating piece 3 is as follows: in normal working condition, the second thread cutting knife 2 is fixed and far away from the first thread cutting knife 1. In the process of thread cutting, the second thread cutting knife 2 rotates towards the first thread cutting knife 1, the thread separating tip 202 is inserted between the thread loops, and the thread separating function is realized. The thread cutting hook 201 drives the bottom thread and the face thread to move towards the side where the first thread cutting knife 1 is located. The second thread cutting knife 2 can first contact the first thread cutting knife 1 and lift it up. In some cases, the second thread cutting knife 2 can also be pressed on the thread separating piece 302 to make it deform downwards, so that the thread separating piece 302 and the first thread cutting knife 1 are separated, and the second thread cutting knife 2 is allowed to be inserted between the thread separating piece 302 and the first thread cutting knife 1. When the thread separating tip 202 approaches the thread separating piece 302 first, because the position is opposite to the guide slope surface 304, due to the slight displacement of the thread separating piece 302 and the second thread cutting knife 2 in the working process of the sewing machine, the thickness of the position opposite to the thread separating tip 202 on the right side of the thread separating piece 302 is thinned, and gradually thickens from the A side to the B side. When the second thread cutting knife 2 moves towards the first thread cutting knife 1, if there is slight shaking of the thread separating tip 202, the thread separating tip 202 can also smoothly enter the outer arc surface of the thread separating piece 302 through the guide slope surface 304, thereby reducing the risk of collision between the second thread cutting knife 2 and the thread separating piece 302, and ensuring that the thread cutting hook 201 drives the bottom thread and the face thread to extend between the thread separating piece 302 and the first thread cutting knife 1, and then the first thread cutting knife 1 and the second thread cutting knife 2 can smoothly cut the thread.

[0043] The thread separating piece 3 and the thread cutting mechanism of the utility model are further described in the following several specific embodiments:

[0044] Referring to Figure 2 , Figure 3 and Figure 6In the embodiment, as a preferred design, the first thread cutting knife 1 is provided with a first catching part 101 on the side surface facing the rotating hook 4, the thread separating piece 302 is provided with a second catching part 303 on the outer arc surface, when the second thread cutting knife 2 is away from the first thread cutting knife 1 before thread cutting, the second catching part 303 on the thread separating piece 302 is kept opposite and close to the first catching part 101 on the first thread cutting knife 1, and the two can be in contact or not, wherein the first catching part 101 and the second catching part 303 have a certain area range, and the rotating hook 4 can rotate normally. During thread cutting, the second thread cutting knife 2 rotates towards the first thread cutting knife 1 and makes the thread cutting hook 201 drive the bottom thread to enter between the first catching part 101 and the second catching part 303, after thread cutting, the second thread cutting knife 2 rotates to reset, the first catching part 101 and the second catching part 303 are close to each other and catch the bottom thread, at this time, the thread cutting mechanism has the function of catching the bottom thread. The left side of the guide slope surface 304 and the outer arc surface of the thread separating piece 302 are provided with a connecting side surface 305, the left side of the connecting side surface 305 is the second catching part 303, that is, the second catching part 303 extends to the right side of the connecting side surface 305, and the connecting side surface 305 is preferably a smooth curved surface. When the thread separating tip 202 enters the guide slope surface 304, it is located on the right side of the connecting side surface 305. In this way, the thread cutting hook 201 can better enter between the first catching part 101 and the second catching part 303 with the bottom thread. In other embodiments, the thread separating piece 302 can also be a common thread separating piece 302 without the function of catching the bottom thread.

[0045] Referring to Figure 4 and Figure 8 In the embodiment, as a preferred design, the projection of the connecting side surface 305 on the horizontal plane extends along a straight line, and the included angle θ between the extension direction and the front-back direction of the sewing machine is -60°-60°, and 0° is preferred (that is, the extension direction is parallel to the front-back direction). With this design, the thread separating tip 202 can smoothly enter the outer arc surface of the thread separating piece 302 through the guide slope surface 304, and avoid bumping on the left side.

[0046] Referring to Figure 4 and Figure 8In the embodiment, the thread separating piece 3 comprises a mounting portion 301 for fixedly connecting to the sewing machine, the thread separating piece 3 is fixedly mounted at a suitable position of the sewing machine through the mounting portion 301, the B-side end of the thread separating piece 302 is fixedly connected to the mounting portion 301, the mounting portion 301 is provided with a positioning side edge 307, preferably the positioning side edge 307 is provided on both left and right sides of the mounting portion 301, and the projection of the connecting side surface 305 on the horizontal plane is parallel to the positioning side edge 307. With this design, when the thread separating piece 3 is manufactured, the connecting side surface 305 can be machined by taking the positioning side edge 307 as the positioning reference to determine the extending direction thereof. Then when the thread separating piece 3 is fixedly mounted through the mounting portion 301, the positioning side edge 307 is ensured to be along the front-rear direction of the sewing machine, i.e. the projection of the connecting side surface 305 on the horizontal plane is ensured to be along the front-rear direction.

[0047] Referring to Figure 4 and Figure 8 In the embodiment, the length L of the guide slope surface 304 in the front-rear direction of the sewing machine (i.e. the distance between the front-rear ends of the projection of the guide slope surface 304 on the horizontal plane along the front-rear direction) is 1-5 mm, and the width W of the guide slope surface 304 in the left-right direction (i.e. the distance between the left-right ends of the projection of the guide slope surface 304 on the horizontal plane along the left-right direction) is 1-8 mm, which can better guide the thread separating tip portion 202 of the first thread cutter 1 to enter the outer curved surface of the thread separating piece 302. Further, the thickness of the thread separating piece 302 is 0.3-2 mm, and the thickness of the section of the right side edge of the thread separating piece 302 at the guide slope surface 304 is 0.1-1.8 mm, which can better avoid the collision between the thread separating tip portion 202 and the right side edge of the thread separating piece 302.

[0048] Referring to Figure 4 and Figure 8 In the embodiment, one end of the thread separating piece 302 is the A-side end and the other end is the B-side end, wherein the axis of the rotating hook 4 is along the left-right direction of the sewing machine, and the rotating hook 4 is located on the left side of the sewing machine, the first thread cutter 1 and the second thread cutter 2 are respectively located on the front side and the rear side of the sewing machine, when the thread separating piece 33 is mounted, the A-side end of the thread separating piece 302 faces the rear side of the sewing machine, the B-side end of the thread separating piece 302 faces the front side and is connected to the mounting portion 301. The right side edge of the thread separating piece 302 has a guide side edge portion 306 which gradually extends to the right along the direction from the A-side end to the B-side end, i.e. from the perspective of the top view, the guide side edge portion 306 is obliquely arranged from the left rear to the right front, and the shape thereof can be a straight line or a curve. During thread cutting, the bobbin thread and the thread will move along the guide side edge portion 306 of the right side edge of the thread separating piece 302 and be guided into the range of the second catching portion 303, thereby better ensuring that the bobbin thread can be caught after thread cutting. In other embodiments, the mounting directions of the first thread cutter 1 and the second thread cutter 2 can also be reversed, i.e. the A-side end of the thread separating piece 302 faces the front side and the B-side end faces the rear side.

[0049] This utility model also provides a sewing machine, including a rotary hook 4 and the aforementioned thread-cutting mechanism, which is disposed at the rotary hook 4 to cut the thread.

[0050] As can be seen from the above, the thread separating component, thread cutting mechanism, and sewing machine of this utility model have the following beneficial effects:

[0051] By providing a guide slope 304 on the thread divider 302, the thread-dividing tip 202 of the second thread cutter 2 is guided smoothly into the outer arc surface of the thread divider 302 during thread cutting. This allows the second thread cutter 2 to smoothly drive the top thread and bottom thread into the first thread cutter 1, achieving smooth engagement and thread cutting. This ensures stable and smooth operation of the sewing machine, and the design is simple and easy to use. Furthermore, when the bottom thread is captured by the second capturing part 303 on the thread divider 302 and the first capturing part 101 on the first thread cutter 1, the guide slope 304 effectively guides the bottom thread between the first capturing part 101 and the second capturing part 303, ensuring effective capture.

[0052] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0053] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A thread separating piece for cooperating with a first thread cutting knife (1) and a second thread cutting knife (2) of a thread cutting mechanism of a sewing machine to cut a thread, comprising a thread separating piece (302) having an A-side end and a B-side end, the A-side end being an end toward the second thread cutting knife (2) when the thread separating piece (302) is installed in the sewing machine, characterized in that: The thread guide (302) is provided with a guide slope (304) extending to the outer arc surface of the thread guide (302) from the side of the right side edge of the thread guide (302) to the B side end, and the guide slope (304) is a smooth transition surface, and the guide slope (304) is opposite to the thread guide tip (202) on the second thread cutter (2) moving towards the first thread cutter (1) when the thread guide (302) is installed in the sewing machine.

2. The branching piece of claim 1, wherein: The thickness of the thread guide (302) is 0.3-2mm, and the thickness of the section of the right side edge of the thread guide (302) at the guide slope (304) is 0.1-1.8mm.

3. The branching device of claim 1, wherein: The right side edge of the thread guide (302) has a guide side edge portion (306) gradually extending to the right along the direction from the A side end to the B side end.

4. A thread cutting mechanism for cutting a thread provided at a rotating hook (4) of a sewing machine, comprising a first thread cutting blade (1) fixedly installed at an outer peripheral side of the rotating hook (4) and a second thread cutting blade (2) provided at the outer peripheral side of the rotating hook (4) and rotatable about the rotating hook (4) to be engaged with or separated from the second thread cutting blade (2), characterized in that: Also comprising the thread guide (3) according to any one of claims 1-3, and the thread guide (302) of the thread guide (3) is located between the rotating hook (4) and the first thread cutter (1).

5. The thread trimming mechanism of claim 4, wherein: The side surface of the first thread cutter (1) towards the rotating hook (4) is provided with a first catching portion (101), and the outer arc surface of the thread guide (302) is provided with a second catching portion (303) matched with the first catching portion (101); a connecting side surface (305) is provided between the left side of the guide slope (304) and the outer arc surface of the thread guide (302), and the left side of the connecting side surface (305) is the second catching portion (303).

6. The thread trimming mechanism of claim 5, wherein: The projection of the connecting side surface (305) on the horizontal plane extends along a straight line, and the angle θ between the extension direction and the front-back direction of the sewing machine is -60°-60°.

7. The thread trimming mechanism of claim 5, wherein: The thread guide (3) comprises a mounting portion (301) fixedly connected in the sewing machine, the B side end of the thread guide (302) is fixedly connected with the mounting portion (301), and the mounting portion (301) is provided with a positioning side edge (307), and the projection of the connecting side surface (305) on the horizontal plane is parallel to the positioning side edge (307).

8. The thread trimming mechanism of claim 4, wherein: The length L of the guide slope (304) in the front-back direction of the sewing machine is 1-5mm.

9. The thread trimming mechanism of claim 4, wherein: The width W of the guide slope (304) in the left-right direction of the sewing machine is 1-8mm.

10. Sewing machine comprising a rotating hook (4), characterized in that: Also comprising the thread cutting mechanism according to any one of claims 4-9, and the thread cutting mechanism is arranged at the rotating hook (4) to cut the thread.

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