Thread trimming device capable of preventing cloth from being sucked

Abstract

The utility model discloses a thread trimming device capable of preventing cloth from being sucked in, and belongs to the technical field of sewing machines. The device comprises a needle plate, an air suction pipe, a movable cutter and a fixed cutter, the needle plate is provided with an air suction opening communicated with the air suction pipe, and the movable cutter and the fixed cutter are located on the lower surface of the needle plate; the key point is that a baffle tongue spanning the middle part is arranged in the air suction opening and is used for preventing the cloth from being sucked in. Reliable protection is achieved through different implementation modes that the blocking tongue and the needle plate are arranged to be of an integrated structure, or the cloth blocking piece is fixed in the sinking groove of the needle plate and extends to form the blocking tongue and the like. In addition, optimized structures such as wire grooves and spiral flow guide ribs are further arranged. The device effectively avoids damage caused by the fact that cloth is sucked into the air suction opening during thin material processing, ensures that thread ends enter scissors according to a set track, improves the thread trimming quality and efficiency, is simple and practical in structure, and is suitable for various sewing devices.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a thread-cutting device that prevents fabric from being sucked in. Background Technology

[0002] Sewing machines are crucial equipment in the processing of clothing, home textiles, and bags. To ensure a clean and efficient sewing process, most modern sewing machines are equipped with thread trimming devices to remove excess thread ends generated during sewing. Figure 1 The needle plate-based thread-cutting device of the knotting machine shown has an air inlet 11 on the needle plate 1. An air suction pipe 2 is fixed to the lower surface of the needle plate corresponding to the air inlet 11. A movable blade 3 and a fixed blade 4 are arranged on the lower surface of the needle plate corresponding to the air inlet 11. Its working principle is that the negative pressure generated by the suction system guides the thread end from the air inlet 11 into the space between the movable blade 3 and the fixed blade 4 during thread cutting, while collecting the cut thread end, so that the scissors can complete the thread cutting action more accurately and efficiently. However, when processing thin materials such as silk and chiffon with a weight of less than 100g / m², the existing thread-cutting device has certain defects: due to the lightness and insufficient rigidity of the thin material, the negative pressure generated by the suction system can easily suck the fabric into the air inlet 11, causing the thread-cutting blade to accidentally cut the fabric, resulting in holes, which seriously affects product quality and production efficiency. At the same time, the fabric sucked into the air inlet 11 will also block the thread end from entering, making it difficult for the thread end to enter the scissors according to the set path, reducing the success rate and efficiency of thread cutting. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a thread-cutting device that prevents fabric from being sucked in. By incorporating a fabric-blocking structure at the suction port, it effectively prevents thin fabrics from being drawn into the suction port, avoiding damage to the fabric during thread cutting. Simultaneously, it ensures that the negative pressure of the suction guides the thread end along a predetermined trajectory into the scissors, improving the thread-cutting quality and efficiency of various sewing equipment when processing thin materials, and guaranteeing proper thread collection. To achieve the above objectives, this utility model adopts the following technical solution:

[0004] A thread-cutting device for preventing fabric from being sucked in includes a needle plate with an air inlet. An air inlet is formed on the needle plate, and an air inlet pipe is fixedly connected to the lower surface of the needle plate, with one end of the air inlet corresponding to the air inlet. A movable blade and a fixed blade are arranged on the lower surface of the needle plate. Unlike the prior art, a baffle is provided inside the air inlet, which is positioned across the middle of the air inlet to prevent fabric from being sucked into the air inlet.

[0005] Furthermore, the baffle extends from one side edge of the air intake to the opposite side, and the baffle and the needle plate are an integral structure.

[0006] Furthermore, a groove is formed on the upper surface of the needle plate corresponding to the air intake, the air intake is located at the bottom of the groove, and a baffle is fixed in the groove by fasteners. A second air inlet corresponding to the air intake is formed on the baffle, and one side edge of the second air inlet extends to the opposite side to form the baffle tongue.

[0007] Furthermore, the air intake extends downwards smoothly on one side relative to the end of the baffle to form a wire groove; the edge of the second air inlet corresponding to the wire groove is recessed outwards to form a second wire groove.

[0008] Furthermore, the outline of the settling trough is circular, and correspondingly, the outline of the baffle sheet is also circular.

[0009] Furthermore, the end of the stop tongue faces the direction of fabric movement, and the root of the stop tongue is directly or indirectly connected to the needle plate.

[0010] Furthermore, both the end and the root of the tongue are rounded.

[0011] Furthermore, the width of the tongue gradually decreases from the root to the end.

[0012] Furthermore, the tongue gradually curves upwards from its base to its tip.

[0013] Furthermore, the inner wall of the suction pipe is provided with spiral guide ribs, the spiral angle of which is 15-45°, to guide the sucked-in thread end to move along the spiral path and reduce the risk of blockage.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Preventing fabric from being sucked in: The baffle tongue is positioned across the middle of the air intake, forming a physical barrier. Its structural characteristics directly prevent thin, low-rigidity fabrics from being sucked into the air intake by the negative pressure generated by the suction system. This avoids the fabric being accidentally cut by the scissor blades, solving the problem of fabric damage during thin material processing and ensuring product quality.

[0016] 2. Ensure thread cutting and thread collection: The baffle does not block the negative pressure of the suction system from guiding the thread. While blocking the fabric, it still ensures that the negative pressure of the suction guides the thread from the suction port into the space between the movable and fixed blades along the set trajectory, achieving precise thread cutting. At the same time, the cut thread can be normally sucked into the collection device, maintaining the efficient operation of the thread cutting device.

[0017] 3. Simple and practical structure: Only a baffle is added to the air inlet of the existing thread cutting device. The original device structure is not significantly changed. The modification cost is low and easy to implement. Moreover, the structure can be adapted to a variety of sewing equipment and is highly practical. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an existing wire-cutting device.

[0019] Figure 2 for Figure 1 A structural diagram from another perspective.

[0020] Figure 3 This is a schematic diagram of the structure of Example 1.

[0021] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0022] Figure 5 This is a schematic diagram of the structure of Example 2.

[0023] Figure 6 for Figure 5 Partial diagram.

[0024] Figure 7 for Figure 6 A magnified view of a section at point B. Detailed Implementation

[0025] Example 1, as Figure 3-4 The illustrated thread-cutting device for preventing fabric from being sucked in includes a needle plate 1 with an air inlet 11. An air inlet 11 is formed on the needle plate 1, and an air inlet pipe 2 is fixedly connected to the lower surface of the needle plate 1, with one end of the air inlet 2 correspondingly connected to the air inlet 11. A movable blade 3 and a fixed blade 4 are disposed on the lower surface of the needle plate. The device is characterized in that a baffle tongue 100 is provided inside the air inlet 11, the baffle tongue 100 extending across the middle of the air inlet 11 to prevent fabric from being sucked into the air inlet 11. The baffle tongue 100 extends from one edge of the air inlet 11 to the opposite side, and the baffle tongue 100 is an integral structure with the needle plate 1.

[0026] Example 2, as Figure 5-7 The thread-cutting device shown differs from Embodiment 1 in that a groove 12 is formed on the upper surface of the needle plate 1 corresponding to the air inlet 11. The air inlet 11 is located at the bottom of the groove 12. A baffle plate 6 is fixed in the groove 12 by fasteners 5. A second air inlet 61 corresponding to the air inlet 11 is formed on the baffle plate 6. One side edge of the second air inlet 61 extends to the opposite side to form the baffle tongue 100.

[0027] Compared to Example 1, Example 2 offers greater applicability and flexibility. In Example 1, the baffle and needle plate are integrated, effectively blocking the fabric, but this has limitations. When used to process coarse threads, occasional clogging occurs, and it's difficult to adapt to different types of fabric. Example 2, however, features a groove on the upper surface of the needle plate corresponding to the air intake, with a baffle plate secured by fasteners. The baffle extends from the edge of the second air inlet on the baffle plate to form the baffle. This design allows the baffle plate to be replaced according to actual processing needs. When processing thin fabrics, a baffle plate suitable for thin fabrics can be used; when processing coarse threads, a baffle plate suitable for thick fabrics can be used, effectively solving the clogging problem and greatly improving the adaptability of the thread-cutting device to different fabrics and thread-cutting scenarios.

[0028] Examples 1 and 2, through different structural designs of the baffle, both achieve the functions of preventing fabric from being sucked in and allowing for normal thread cutting. The following systematically outlines the working process based on the structural characteristics of both examples:

[0029] 1. Initial state: Place the fabric to be processed on the upper surface of the needle plate 1. The movable knife 3 and the fixed knife 4 are located on the lower surface of the needle plate 1, corresponding to the position of the air inlet 11. The air inlet 2 is connected to the air inlet 11 and connected to the air inlet system.

[0030] 2. Sewing and Thread Trimming Start: The sewing machine starts working, and the fabric moves along the set path on the needle plate 1 to sew. When thread trimming is required, the suction system starts, generating negative pressure and creating suction at the suction port 11.

[0031] 3. Working process of Example 1: Since the baffle 100 and the needle plate 1 are an integral structure and are located across the middle of the air inlet 11, the baffle 100 directly blocks the fabric from moving towards the air inlet 11 during the fabric's movement, preventing the fabric from being sucked in. At the same time, under the negative pressure of the suction, the thread ends can smoothly enter the air inlet 11 from both sides or gaps of the baffle 100 and be guided between the movable blade 3 and the fixed blade 4 to complete the thread cutting action. The cut thread ends are then sucked into the collection device by the suction pipe 2.

[0032] 4. Working process of Example 2: The baffle plate 6 fixed in the groove 12 on the upper surface of the needle plate 1, and the baffle tongue 100 extending from the second air inlet 61 also serve to block the fabric. When the fabric moves on the needle plate 1, the baffle tongue 100 restricts the fabric from entering the area of ​​the air inlet 11. The negative pressure generated by the suction system causes the thread end to enter through the channel formed by the second air inlet 61 and the air inlet 11, through the gap around the baffle tongue 100, and is guided to the positions of the movable knife 3 and the fixed knife 4 to complete the thread cutting. The thread end after cutting is collected through the suction pipe 2.

[0033] 5. Continuous operation: Throughout the sewing and thread cutting process, the tongue 100 continuously blocks the fabric, ensuring that the suction system only affects the thread ends, guaranteeing the stable and efficient operation of the thread cutting device, preventing fabric damage, and improving product processing quality.

[0034] In another preferred embodiment, the suction port 11 extends downwards and rounded on one side relative to the end of the baffle tongue 100 to form a wire guide groove 13; the edge of the second air inlet 61 corresponding to the wire guide groove 13 is recessed outwards to form a second wire guide groove 62. By setting the wire guide groove and the second wire guide groove, a clearer guiding path is provided for the wire end, allowing the wire end to enter the scissors more smoothly under the negative pressure of suction, reducing the problem of wire tangling and jamming caused by unclear path, improving the success rate and efficiency of wire cutting, and reducing the risk of the wire end clogging the suction port.

[0035] In another preferred embodiment, the contour of the sink 12 is circular, and correspondingly, the contour of the baffle plate 6 is also circular. Compared to other shapes, the circular contours of the sink and baffle plate make them easier to position and fix during installation, resulting in more even stress distribution and effectively reducing component damage caused by stress concentration. Simultaneously, the circular structure ensures more uniform airflow distribution during suction, which helps improve the suction system's ability to collect lint.

[0036] In another preferred embodiment, the end of the tongue 100 faces the direction of fabric movement, and the root of the tongue 100 is directly or indirectly connected to the needle plate 1. The end of the tongue facing the direction of fabric movement allows for more timely and effective prevention of fabric from being sucked into the air intake, resulting in better protection. The root's secure connection to the needle plate ensures the stability of the tongue during operation, preventing loosening from affecting its functions of preventing fabric suction and thread cutting.

[0037] In another preferred embodiment, the ends and roots of the tongue 100 are rounded. This rounded transition eliminates the sharp edges at the ends and roots of the tongue, preventing the fabric from being scratched by sharp edges during movement, reducing airflow resistance, making it easier for thread ends to pass through, and decreasing the likelihood of thread ends getting tangled at sharp edges.

[0038] In another preferred embodiment, the width of the tongue 100 gradually decreases from the root to the end. This gradual width design ensures that the blocking force of the tongue on the fabric gradually weakens from the root to the end, providing sufficient blocking strength at the root to prevent the fabric from being sucked in, while reducing interference with the movement of the fabric at the end, ensuring smooth passage of the fabric, and at the same time reducing the obstruction encountered by the thread end when passing through, thus improving the smoothness of thread cutting.

[0039] In another preferred embodiment, the tongue 100 gradually curves upwards from its base to its tip. This gradual upward curve causes the fabric to naturally rise as it approaches the air intake, further enhancing the blocking effect and effectively preventing the fabric from being sucked in. Simultaneously, the curved structure provides more space for thread ends to pass through, facilitating their entry into the scissor area under negative pressure.

[0040] In another preferred embodiment, the inner wall of the suction pipe 2 is provided with spiral guide ribs. The spiral angle of the spiral guide ribs is 15-45°, which is used to guide the sucked-in wire ends to move along the spiral path, reducing the risk of blockage. The spiral guide ribs guide the wire ends to move along the spiral path, making the wire ends more evenly distributed in the suction pipe and avoiding the accumulation of wire ends in one place. This significantly reduces the possibility of blockage in the suction pipe, ensures the continuous and stable operation of the suction system, extends the maintenance cycle of the equipment, and improves production efficiency.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thread-cutting device for preventing fabric from being sucked in, comprising a needle plate (1), an air inlet (11) formed on the needle plate (1), an air suction pipe (2) fixedly connected to the lower surface of the needle plate (1), one end of the air suction pipe (2) correspondingly connected to the air inlet (11); and a movable blade (3) and a fixed blade (4) disposed on the lower surface of the needle plate, characterized in that, A baffle (100) is provided inside the air intake (11). The baffle (100) is positioned across the middle of the air intake (11) to prevent the fabric from being sucked into the air intake (11).

2. The thread-cutting device for preventing fabric from being sucked in according to claim 1, characterized in that, The tongue (100) is formed by extending from one side edge of the air intake (11) to the opposite side, and the tongue (100) and the needle plate (1) are an integral structure.

3. The thread-cutting device for preventing fabric from being sucked in according to claim 1, characterized in that, A groove (12) is formed on the upper surface of the needle plate (1) corresponding to the air inlet (11). The air inlet (11) is located at the bottom of the groove (12). A baffle plate (6) is fixed in the groove (12) by fasteners (5). A second air inlet (61) corresponding to the air inlet (11) is formed on the baffle plate (6). One side edge of the second air inlet (61) extends to the opposite side to form the baffle tongue (100).

4. A thread-cutting device for preventing fabric from being sucked in according to claim 3, characterized in that, The air intake (11) extends downward smoothly on one side relative to the end of the baffle (100) to form a wire guide groove (13); the edge of the second air inlet (61) corresponding to the wire guide groove (13) is recessed outward to form a second wire guide groove (62).

5. A thread-cutting device for preventing fabric from being sucked in according to claim 3, characterized in that, The outline of the sink (12) is circular, and correspondingly the outline of the baffle (6) is also circular.

6. A thread-cutting device for preventing fabric from being sucked in according to claim 2 or 3, characterized in that, The end of the tongue (100) faces the direction of fabric movement, and the root of the tongue (100) is directly or indirectly connected to the needle plate (1).

7. A thread-cutting device for preventing fabric from being sucked in according to claim 2 or 3, characterized in that, The end and root of the tongue (100) are both rounded.

8. A thread-cutting device for preventing fabric from being sucked in according to claim 2 or 3, characterized in that, The width of the tongue (100) gradually decreases from the root to the end.

9. A thread-cutting device for preventing fabric from being sucked in according to claim 2 or 3, characterized in that, The tongue (100) gradually curves upward from the root to the end.

10. A thread-cutting device for preventing fabric from being sucked in according to claim 1, characterized in that, The inner wall of the suction pipe (2) is provided with a spiral guide rib, the spiral angle of which is 15-45°, which is used to guide the sucked-in thread to move along the spiral path and reduce the risk of blockage.

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