Thread trimming structure of sewing machine

Abstract

The utility model provides a thread trimming structure of a sewing machine, and belongs to the technical field of sewing machines. The problem of how to improve the operation convenience is solved. According to the thread trimming structure of the sewing machine, the sewing machine comprises a cutter plate, the thread trimming structure comprises a fixed cutter fixed to the cutter plate, the thread trimming structure further comprises a thread hook with a thread hooking groove, a notch of the thread hooking groove is opposite to a cutter head of the fixed cutter, and the thread hook is connected to the cutter plate in a sliding mode. A wire pressing plate which is arranged close to the fixed cutter head and located on one side of the wire hook is fixed to the cutter plate, and the wire pressing plate is tightly pressed on the outer wall, provided with the wire hooking groove, of the wire hook and can seal and cover the wire hooking groove. The thread trimming structure of the sewing machine can improve the operation convenience.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a thread-cutting structure for a sewing machine. Background Technology

[0002] A sewing machine is a machine that uses one or more sewing threads to create one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. The sewing threads specifically include top thread and bottom thread. After the sewing work is completed, both need to be cut to separate the top thread and bottom thread from the fabric. Then, the presser foot is raised to pull the finished product off the sewing machine table.

[0003] During the above processing, the cutting of seams (i.e., top and bottom threads) is particularly frequent. In the existing technology, the above operations are often carried out by the operator manually cutting the two, but this operation method is very inconvenient.

[0004] Firstly, manually cutting the thread requires the operator to frequently switch tools, which wastes processing time. Secondly, after cutting the thread, the operator needs to pay special attention to the thread threaded through the needle eye. Since the thread is cut, the amount of the end remaining through the needle eye is already small. In addition, with the needle moving upward, it is very easy for the thread to come out of the needle eye, which means that the operator needs to re-thread it. Summary of the Invention

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a thread-cutting structure for a sewing machine. The technical problem to be solved by this utility model is: how to improve the ease of operation.

[0006] The objective of this utility model can be achieved through the following technical solution: a thread-cutting structure for a sewing machine, the sewing machine including a blade plate, characterized in that the thread-cutting structure includes a fixed blade fixed to the blade plate, the thread-cutting structure also includes a thread hook with a hook groove, and the opening of the hook groove is disposed opposite to the blade head of the fixed blade, the thread hook is slidably connected to the blade plate, and a pressure plate is fixed on the blade plate near the blade head of the fixed blade and located on one side of the thread hook, the pressure plate presses against the outer wall of the thread hook with the hook groove and can seal the hook groove.

[0007] The thread-cutting structure of this sewing machine uses a fixed blade on the cutter plate as the thread-cutting component to cut the sewing thread (including the top and bottom threads). During the thread-cutting operation, the thread hook, which is slidably connected to the cutter plate, slides outward relative to the blade head of the fixed blade, so that the hook groove on the hook is located outside the thread. During the sliding reset process of the hook, the thread is hooked by the hook groove and pulled towards the blade head. The thread, under tension, eventually contacts the blade head of the fixed blade, and the thread is cut by the fixed blade under the shearing force. This structure achieves automated thread cutting, eliminating the need for frequent manual operation by the operator and fully ensuring the operator's convenience. On this basis, an additional feature is provided on the cutter plate... There is a pressure plate pressed against the outer wall of the hook. When the hook slides and the thread is cut, the pressure plate can cover the hook groove. That is, during the thread cutting process, the thread, which is constantly being pulled, slides to the deepest part of the hook groove and abuts against the bottom wall of the groove. When the hook slides towards the blade of the fixed knife and cuts the thread, the pressure plate, which is always pressed against the outer wall of the hook, covers the hook groove. The thread (especially the top thread) passing through the hook groove is pressed tightly against the outer wall of the hook by the pressure plate. At this time, if the operator controls the needle to rise, the pressed top thread will not come out of its needle hole due to the rising action of the needle. Therefore, the operator does not need to perform frequent threading actions, which fully ensures the convenience of the operator.

[0008] In the thread-cutting structure of the sewing machine described above, the thread hook is elongated and located above the fixed blade. The rear end of the thread hook is slidably connected to the blade plate, and the front end of the thread hook has a downwardly protruding hooking portion with a hooking edge facing the fixed blade head. The hooking groove is formed between the hooking edge and the outer wall edge of the thread hook, and the angle formed between the hooking edge and the outer wall edge of the thread hook is an acute angle. This arrangement reduces the space occupied by the thread hook and the fixed blade on the horizontal plane of the blade plate while ensuring that the hooking groove and the fixed blade head are positioned relatively. Furthermore, the thread hook's rear end is slidably connected to the blade plate, allowing the hooking portion at its front end to move closer to or further away from the fixed blade as the thread hook slides. Moreover, the hooking edge of the hooking portion and the outer wall edge of the thread hook cooperate to form an acute-angled hooking groove, effectively ensuring that the hooked thread will not slip out of the hooking groove, thus guaranteeing the effectiveness of thread cutting.

[0009] In the thread-cutting structure of the sewing machine described above, the hook section also has an arc-shaped guide edge. One end of the guide edge extends to the front edge of the hook, and the other end extends to the bottom of the hook section and is adjacent to the edge of the hook edge. This structure ensures that the thread can slide along the guide edge during the extension of the hook, thereby guiding the thread and ensuring that the thread can be embedded into the hook groove.

[0010] In the thread-cutting structure of the sewing machine described above, a thread-holding opening is provided on the inner bottom wall of the hook groove, and the pressure plate can cover the thread-holding opening. The thread hooked by the hook groove is finally embedded into the thread-holding opening. The inner wall of the thread-holding opening limits the thread, effectively preventing and reducing possible wobbling of the thread during the process. Furthermore, when the hook slides inward, the pressure plate closes the thread-holding opening, thereby pressing the exposed thread against the outer wall of the hook, thus preventing the top thread from slipping out of the needle hole when the needle moves upward.

[0011] In the thread-cutting structure of the sewing machine described above, the pressure plate includes a fixing part fixed to the blade plate. One side of the fixing part has a vertical section, and the vertical section has a long, strip-shaped pressure section. The pressure section is continuously bent and pressed against the outer wall of the thread hook. Specifically, the pressure plate consists of three parts: the fixing part, the vertical section, and the pressure section. The fixing part, as the main body, is fixedly connected to the blade plate, providing effective support for the pressure section. The vertical section acts as a transition, connecting the pressure section and the fixing part. The long, strip-shaped pressure section, due to its material properties and continuously bent structure, possesses a certain degree of elasticity. This elastic force keeps it pressed against the outer wall of the thread hook, thereby ensuring the tightness of the sewing thread.

[0012] In the thread-cutting structure of the sewing machine described above, a pressure plate is also fixed on the blade plate and pressed against the top of the thread hook. The pressure plate includes a positioning part fixed on the blade plate, and one side of the positioning part has a vertical extension. The extension has a long strip-shaped pressure plate, the front end of which is bent and pressed against the top outer wall of the thread hook. The pressure plate presses and limits the position of the thread hook, preventing it from shaking or wobbling during sliding. Specifically, the pressure plate comprises three parts: the positioning part, the extension, and the pressure plate. The positioning part is fixed to the blade plate as the main body, the extension serves as a transition connecting the positioning part and the pressure plate, and the long strip-shaped pressure plate, due to its material properties and the bent front end, has a certain elasticity at its front end. This elasticity keeps it pressed against the top outer wall of the thread hook, thus ensuring the limiting of the thread hook.

[0013] In the thread-cutting structure of the sewing machine described above, the fixing part is located above the positioning part, and the fixing part and the positioning part are locked together to the blade plate by fasteners. This structure reduces the space required for installing the pressure plate and the pressure plate, effectively improving the space utilization rate on the blade plate surface.

[0014] Compared with existing technologies, the thread-cutting structure of this sewing machine has the following advantages:

[0015] 1. By using a fixed blade on the blade plate and a hook with a hook groove that is slidably connected to the blade plate, the hook catches the sewing thread and pulls it to contact the blade head of the fixed blade. The resulting shearing force cuts the sewing thread, eliminating the need for frequent manual thread cutting by the operator and effectively improving the convenience of operation.

[0016] 2. By pressing the outer walls of the pressure plate and the hook together, the cut thread (the top thread) is pressed firmly against the outer wall of the hook by the pressure plate, preventing the needle from coming out of its eye when moving upwards. This eliminates the need for the operator to frequently thread the needle, effectively improving the convenience of operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the thread-cutting mechanism of this sewing machine.

[0018] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0019] Figure 3 This is a schematic diagram and a magnified view of the thread-cutting mechanism of this sewing machine during thread cutting.

[0020] Figure 4 This is a front view and a partial enlarged view of the thread-cutting structure of this sewing machine.

[0021] Figure 5 This is a structural diagram of the pressure plate.

[0022] Figure 6 This is a structural diagram of the pressure plate.

[0023] In the diagram, 1 is the blade; 2 is the fixed blade; 3 is the wire hook; 31 is the hook groove; 311 is the wire clamping opening; 32 is the hook part; 321 is the hook edge; 322 is the wire edge; 4 is the pressure plate; 41 is the fixing part; 42 is the vertical part; 43 is the pressure part; 5 is the pressure plate; 51 is the positioning part; 52 is the extension part; and 53 is the pressure plate. Detailed Implementation

[0024] 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.

[0025] like Figure 1-4As shown, in the thread-cutting structure of this sewing machine, the sewing machine includes a blade plate 1, which is horizontally arranged and fixed to the base panel of the sewing machine. A strip-shaped fixed blade 2 is fixed on the upper side of the blade plate 1, and the blade head of the fixed blade 2 protrudes from the edge of the blade plate 1. The thread-cutting structure includes a long, strip-shaped thread hook 3, which is slidably connected to the blade plate 1 at one end and located above the fixed blade 2. Its sliding direction is the same as the length direction of the fixed blade 2. The other end of the thread hook 3 protrudes downward and is connected to the blade head of the fixed blade 2. The hooking part 32 is positioned opposite to the head. The hooking part 32 has a hooking edge 321 that is inclined and facing the head of the fixed blade 2. The hooking edge 321 and the outer wall edge of the hook 3 cooperate to form a hooking groove 31 with an acute angle. A hooking hole 311 is opened on the bottom wall of the hooking groove 31. The hooking part 32 also has an arc-shaped guide edge 322. One end of the guide edge 322 extends to the front edge of the hook 3, and the other end extends to the bottom of the hooking part 32 and is adjacent to the edge of the hooking edge 321.

[0026] Combination Figure 5 The wire cutting structure also includes a wire pressing plate 4. Specifically, the wire pressing plate 4 includes a fixing part 41 that is horizontally set and fixed on the blade plate 1. On one side of the fixing part 41, there is a vertical part 42 that protrudes from the upper side of the fixing part 41. The vertical part 42 has a wire pressing part 43 that is long and continuously bent. The wire pressing part 43 is located on one side of the hook 3 and abuts against the outer side wall of the hook 3. When the hook 3 slides on the blade plate 1 and the hook part 32 continuously approaches the blade head of the fixed blade 2, the wire pressing part 43 can eventually seal the hook groove 31 and the wire clamping opening 311.

[0027] Combination Figure 6 The wire cutting structure also includes a pressure plate 5. Specifically, the pressure plate 5 includes a positioning part 51 that is horizontally arranged and fixed on the blade plate 1. On one side of the positioning part 51, there is an extension part 52 that protrudes vertically from the upper side of the positioning part 51. On the extension part 52, there is a long strip-shaped pressure plate part 53 with a bent front end. The front end of the pressure plate part 53 abuts against the top outer wall of the hook 3. It is worth mentioning that the fixing part 41 and the positioning part 51 are stacked. Specifically, the fixing part 41 is located above the positioning part 51. Both of them have strip holes on their surfaces. Screws are inserted into the strip holes of the fixing part 41 and the positioning part 51 and screwed to the blade plate 1, so that the fixing part 41 and the positioning part 51 are locked together on the blade plate 1.

[0028] Operating principle: After sewing the fabric, the operator controls the hook 3 to slide on the blade plate 1. With the thread embedded in the hook groove 31 and locked in the thread locking hole 311, the thread pulled by the hook 3 continuously approaches the blade head of the fixed blade 2. The thread under tension is cut by the shearing force generated by the hook part 32 and the fixed blade 2, thus completing the thread cutting action. On this basis, since the pressure plate 4 covers the hook groove 31 and the thread locking hole 311, and the pressure part 43 is always pressed against the outer wall of the hook 3, the cut thread, especially the top thread, is clamped between the pressure part 43 and the outer wall of the hook 3. During the subsequent needle rising action, it effectively prevents the top thread from coming out of the needle hole.

[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 blade plate 1, fixed blade 2, hook 3, hook groove 31, hook opening 311, hook part 32, hook edge 321, wire edge 322, pressure plate 4, fixing part 41, vertical part 42, pressure part 43, pressure cover plate 5, positioning part 51, extension part 52, and pressure cover part 53, 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 thread trimming structure of a sewing machine comprising a knife plate (1), characterized in that, The wire cutting structure includes a fixed blade (2) fixed on a blade plate (1) and a wire hook (3) with a hook groove (31). The opening of the hook groove (31) is opposite to the head of the fixed blade (2). The wire hook (3) is slidably connected to the blade plate (1). A pressure plate (4) is fixed on the blade plate (1) near the head of the fixed blade (2) and located on one side of the wire hook (3). The pressure plate (4) presses against the outer wall of the wire hook (3) with the hook groove (31) and can cover the hook groove (31).

2. The thread trimming structure of the sewing machine according to claim 1, characterized by, The hook (3) is elongated and located above the fixed blade (2). The rear end of the hook (3) is slidably connected to the blade plate (1). The front end of the hook (3) has a downwardly protruding hook portion (32). The hook portion (32) has a hook edge (321) facing the blade head of the fixed blade (2). The hook groove (31) is formed between the hook edge (321) and the outer wall edge of the hook (3). The included angle formed between the hook edge (321) and the outer wall edge of the hook (3) is an acute angle.

3. The thread trimming structure of the sewing machine according to claim 2, characterized by, The hook portion (32) also has an arc-shaped conductor edge (322), one end of which extends to the front edge of the hook (3) and the other end extends to the bottom of the hook portion (32) and is adjacent to the edge of the hook edge (321).

4. The thread-cutting structure of the sewing machine according to any one of claims 1-3, characterized in that, The inner bottom wall of the hook groove (31) is provided with a wire-locking port (311), and the wire-pressing plate (4) can cover the wire-locking port (311).

5. The thread trimming structure of a sewing machine according to any one of claims 1 to 3, wherein The pressure plate (4) includes a fixing part (41) fixed to the blade (1). One side of the fixing part (41) has a vertical part (42) in the vertical direction. The vertical part (42) has a strip-shaped pressure part (43). The pressure part (43) is continuously bent and pressed against the outer wall of the hook (3).

6. The thread trimming structure of the sewing machine according to claim 5, wherein The blade (1) is also fixed with a cover plate (5) that presses against the top of the hook (3). The cover plate (5) includes a positioning part (51) fixed on the blade (1). The positioning part (51) has an extension part (52) on one side in a vertical direction. The extension part (52) has a long strip-shaped cover part (53). The front end of the cover part (53) is bent and pressed against the top outer wall of the hook (3).

7. The thread trimming structure of the sewing machine according to claim 6, wherein The fixing part (41) is located above the positioning part (51), and the fixing part (41) and the positioning part (51) are locked together on the blade plate (1) by fasteners.

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