A double knife thread trimming device

Abstract

The utility model discloses a double knife line cutting device relates to sewing equipment technical field, and double knife line cutting device includes: the casing, first moving knife mechanism, including: first moving knife, be located one side of the needle plate, and the first end of first moving knife is connected with first drive link, and the first side of first moving knife second end is equipped with V-shaped line division sharp, and the second side of first moving knife second end sets up V-shaped groove, and the one end of V-shaped groove is formed first blade mouth close to V-shaped line division sharp, second moving knife mechanism, including: second moving knife, be located one side of the needle plate, and the first end of second moving knife is connected with second drive link, and second drive link extends along second direction, and the second end of second moving knife sets up second blade mouth. The above-mentioned double knife line cutting device has solved the technical problem that the existing line cutting device is easy to influence normal sewing thread ring generation, causes sewing failure, influences sewing efficiency, and the size of the thread tip still is longer after cutting the line.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, and in particular to a double-blade thread-cutting device. Background Technology

[0002] During the starting and ending stages of a sewing machine, long thread ends remain on the fabric surface. These starting thread ends form bird's nest-like patterns on the sewn garment, affecting the overall quality of the garment. To ensure garment quality, these thread ends must be trimmed manually, increasing labor intensity and reducing sewing efficiency. Existing technology discloses a thread-cutting device with a double-blade mechanism and a sewing machine, including a first moving blade mechanism and a second moving blade mechanism, with their output ends coaxially arranged. The second moving blade cooperates with the first moving blade to cut the starting thread.

[0003] However, the aforementioned thread-cutting devices can easily interfere with the generation of normal sewing thread loops, causing sewing defects and affecting sewing efficiency. Furthermore, the thread end remaining after cutting is still quite long. On the other hand, the aforementioned thread-cutting devices have a complex structure, require a large space, and are not suitable for placement under the sewing machine needle plate. Therefore, a double-blade thread-cutting device is proposed to address these problems. Utility Model Content

[0004] The purpose of this invention is to provide a double-blade thread cutting device that solves the technical problems of existing thread cutting devices that easily affect the generation of normal sewing thread loops, causing sewing failures, affecting sewing efficiency, and leaving a relatively long thread end after cutting.

[0005] To achieve the above objectives, this utility model provides a double-blade thread cutting device, comprising: a housing, a needle plate and a needle on the housing, a needle hole on the needle plate, the needle reciprocating along a first direction and passing through the needle hole, and a rotary hook inside the housing, the rotary hook being driven to rotate to cooperate with the movement of the needle.

[0006] The first moving part includes:

[0007] The first moving blade is located on one side of the needle plate. The first end of the first moving blade is sleeved and connected to the first driving rod. The first side of the second end of the first moving blade is provided with a V-shaped dividing tip. The second side of the second end of the first moving blade is provided with a V-shaped groove. The end of the V-shaped groove near the V-shaped dividing tip forms a first cutting edge. The first driving rod can be driven to drive the first moving blade to reciprocate around the axis of the first driving rod.

[0008] The second cutting mechanism includes:

[0009] The second moving blade is located on one side of the needle plate. The first end of the second moving blade is connected to the second driving rod, which extends along a second direction. The second end of the second moving blade is provided with a second cutting edge. The second driving rod can be driven to drive the second moving blade to reciprocate along the second direction, which is perpendicular to the first direction.

[0010] A pressure plate is disposed on the housing, the pressure plate is located below the first moving blade, and the top surface of the pressure plate is in contact with the bottom surface of the first moving blade.

[0011] Preferably, the first moving blade mechanism further includes: a first drive motor fixedly connected to the housing, a first drive shaft provided at the output end of the first drive motor, a first crank sleeved at the end of the first drive shaft, the first crank rotatably connected to a transmission rod, the transmission rod rotatably connected to a second crank, the other end of the second crank sleeved to the first drive rod, and the upper end of the first drive rod sleeved to the first moving blade.

[0012] Preferably, the second moving blade mechanism further includes: a second drive motor, fixedly connected to the housing, a second drive shaft being provided at the output end of the second drive motor, a third crank being sleeved at the end of the second drive shaft, the other end of the third crank being rotatably connected to a second drive rod, and the second drive rod being rotatably connected to the second moving blade.

[0013] Preferably, a guide plate is provided on the housing, and a through guide hole is provided on the top surface of the guide plate. The guide hole extends along the second direction. The end of the second drive rod away from the third crank is rotatably connected to a rotating shaft. The rotating shaft passes through the guide hole. A fixing sleeve is provided at the end of the second moving knife away from the needle plate. The fixing sleeve is rotatably connected to the rotating shaft.

[0014] Preferably, a limiting groove is provided on the top surface of the guide rail plate, the limiting groove extends along the second direction, and the limiting groove is slidably connected to the second moving blade.

[0015] Preferably, the second end of the second moving blade is provided with a cutting head, the bottom surface of the cutting head is in contact with the top surface of the first moving blade, and the bottom edge of the cutting head is provided with a second cutting edge, which extends along a third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0016] Preferably, the housing is provided with a suction pipe, the suction pipe is connected to a ventilation device, and the upper opening of the suction pipe is located below the first moving blade, while the lower opening of the suction pipe is located inside the collection device.

[0017] Preferably, a pressure plate (10) is provided on the housing (1), the pressure plate (10) is located below the first moving blade (601), and the top surface of the pressure plate (10) is attached to the bottom surface of the first moving blade (601).

[0018] Preferably, the top surface of the pressure plate (10) is provided with a through hole, which is located directly above the upper opening of the suction pipe (9).

[0019] Preferably, a V-shaped groove (6014) is provided on the top surface of the first moving blade (601), the upper edge of the V-shaped groove (6014) near the V-shaped dividing tip (6011) forms the first cutting edge (6013), and an arc-shaped groove (6016) is provided at the end of the V-shaped groove (6014) away from the V-shaped dividing tip (6011).

[0020] Compared with the above-mentioned background technology, the double-blade wire cutting device provided by this utility model has the following beneficial effects:

[0021] In this invention, during the initial sewing stage, the second cutting edge of the second moving blade and the first cutting edge of the first moving blade work together to cut the top thread, ensuring that the thread size on the fabric is equal to the vertical distance between the fabric plane and the top surface of the first moving blade plus the stitch length of a single needle. Similarly, during the final sewing stage, the second cutting edge of the second moving blade and the first cutting edge of the first moving blade work together to cut the top and bottom threads, ensuring that the thread size on the fabric is equal to the vertical distance between the fabric plane and the top surface of the first moving blade plus the stitch length of a single needle. This maximizes the reduction of thread size during both the initial and final sewing stages, effectively reducing thread ends in the garment, preventing bird's nest-like tangles, improving the efficiency of subsequent finishing, and enhancing the quality and aesthetics of garment sewing.

[0022] Second, in this utility model, the first moving knife mechanism and the second moving knife mechanism are arranged separately with the rotary hook and the needle, resulting in a simple overall structure that does not require a large space. This allows for a reasonable arrangement under the sewing machine needle plate. Furthermore, the first moving knife mechanism and the second moving knife mechanism precisely coordinate their sewing actions during the starting and ending stages. While completing the thread cutting action, they do not interfere with the normal generation of the sewing thread loop, thus avoiding sewing malfunctions, making sewing smoother, and effectively improving sewing efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a perspective structural diagram of the double-blade wire-cutting device provided in an embodiment of the present utility model;

[0025] Figure 2 A three-dimensional structural view of the double-blade wire cutting device provided in this embodiment of the present invention, after the housing is concealed.

[0026] Figure 3 A three-dimensional structural diagram of the double-blade wire cutting device provided in this embodiment of the present invention, after concealing the housing, suction pipe, and wire pressing plate;

[0027] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0028] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0029] Figure 6 An assembly diagram of the first moving knife in the first position during the seam-starting stage, provided for an embodiment of this utility model;

[0030] Figure 7 A top view of the first moving knife in the first position during the seam-starting stage, as provided in an embodiment of this utility model.

[0031] Figure 8 This is an assembly diagram of the first moving knife in the second position during the seam-starting stage, provided as an embodiment of the present invention.

[0032] Figure 9 A top view of the first moving knife in the second position during the seam-starting stage, as provided in an embodiment of this utility model.

[0033] Figure 10 This is an assembly diagram showing the first moving knife in the third position during the seam-starting stage, provided in an embodiment of the present invention.

[0034] Figure 11 A top view of the first moving knife in the third position during the seam-starting stage, as provided in an embodiment of this utility model.

[0035] Figure 12 This is an assembly diagram showing the first moving knife in the fourth position during the seam-starting stage, provided in an embodiment of the present invention.

[0036] Figure 13 A top view of the first moving knife in the second position during the seam-starting stage, as provided in an embodiment of this utility model.

[0037] Figure 14 This is an assembly diagram showing the first moving knife in the fifth position during the seam-starting stage, as provided in an embodiment of the present invention.

[0038] Figure 15 A top view of the first moving knife in the second position during the seam-starting stage, as provided in an embodiment of this utility model.

[0039] Figure 16 This is an assembly diagram of the first moving blade in the first position during the sewing end stage, provided by an embodiment of the present utility model.

[0040] Figure 17 This is an assembly diagram showing the first moving blade in the second position during the sewing end stage, as provided in an embodiment of the present utility model.

[0041] Figure 18 This is an assembly diagram showing the first moving blade in the fourth position during the sewing completion stage, as provided in an embodiment of the present invention.

[0042] Specifically, 1-machine housing; 2-machine needle; 3-needle hole; 4-needle hole axis; 5-rotary hook; 6-first moving blade mechanism; 601-first moving blade; 6011-V-shaped dividing tip; 6012-V-shaped groove; 6013-first cutting edge; 6014-V-shaped countersunk groove; 6015-cylindrical hole; 6016-arc groove; 602-first drive motor; 603-first drive shaft; 604-first crank; 605-transmission rod; 606-second crank; 607-First drive rod; 7-Second moving blade mechanism; 701-Second moving blade; 7011-Cut head; 7012-Second cutting edge; 7013-Fixed sleeve; 702-Second drive motor; 703-Second drive shaft; 704-Third crank; 705-Second drive rod; 7051-Rotating shaft; 8-Guide rail plate; 801-Guide hole; 802-Limiting groove; 9-Suction pipe; 10-Pressure plate; 11-Fabric; 12-Top thread; 13-Bottom thread. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] like Figure 1 , Figure 2 and Figure 3As shown, in order to achieve the above objectives, this utility model provides a double-blade wire cutting device, including: a housing 1 and a first moving blade mechanism 6 and a second moving blade mechanism 7 disposed on the housing 1.

[0046] The housing 1 is provided with a needle plate and a needle 2. The needle plate is provided with a needle hole 3. The needle 2 reciprocates along a first direction and passes through the needle hole 3. Figure 6 In the X direction, the needle plate is provided with a needle hole 3, and the direction of the needle hole axis 4 is consistent with the first direction. The machine housing 1 is provided with a rotary hook 5, which can be driven to rotate to cooperate with the movement of the needle 2 to sew the fabric 11. The needle 2 and the rotary hook 5 are relatively mature existing technologies, and will not be described in detail.

[0047] The first moving blade mechanism 6 includes: a first moving blade 601 disposed on one side of the needle plate; a first end of the first moving blade 601 is sleeved and connected to a first drive rod 607; a V-shaped dividing tip 6011 is provided on the first side of the second end of the first moving blade 601; and a V-shaped groove 6012 is provided on the second side of the second end of the first moving blade 601. Figure 1 , Figure 4 and Figure 7 As shown, in the initial state, the first moving blade 601 is located on the left side of the needle plate, the V-shaped dividing tip 6011 is located on the right side of the second end of the first moving blade 601, and the V-shaped groove 6012 is located on the left side of the second end of the first moving blade 601. It should be noted that the first cutting edge 6013 is arc-shaped, and the first driving rod 607 can be driven to drive the first moving blade 601 to reciprocate around the axis of the first driving rod 607.

[0048] The second moving blade mechanism 7 includes: a second moving blade 701 disposed on one side of the needle plate, the first end of the second moving blade 701 being connected to a second drive rod 705, the second drive rod 705 extending along a second direction, the second direction being... Figure 7 In the Y direction, the second direction is perpendicular to the first direction. The second end of the second moving blade 601 is provided with a second cutting edge 7012. The second driving rod 705 can be driven to drive the second moving blade 701 to reciprocate along the second direction, so that the second cutting edge 7012 and the first cutting edge 6013 can shear and cooperate to cut the surface line 12 and / or the bottom line 13.

[0049] When this utility model is in use, if the first moving blade 601 is in the sewing stage and located in the first position, and both the first moving blade 601 and the second moving blade 701 are located on the first side passing through the needle hole axis 4, then... Figure 6 and Figure 7 As shown, the first moving tool 601 is controlled to move from the first position to the second position, as follows: Figure 8 and Figure 9As shown, the V-groove 6012 is positioned on the second side of the needle hole axis 4. The needle 2 descends from the needle plate position and passes through the needle hole 3 to bring the thread 12 into the rotary hook 5 position. The rotary hook 5 hooks the thread 12 during rotation. After the needle 2 returns to the needle plate position, the first moving blade 601 is controlled to move from the first position to the third position, as shown... Figure 10 and Figure 11 As shown, the V-shaped thread divider 6011 is positioned on the first side of the needle hole axis 4, and the top thread 12 enters the V-shaped groove 6012, so that a section of the top thread 12 below the first moving blade 601 is clamped and fixed by the first moving blade 601 and the pressure plate 10; the needle 2 descends again from the needle plate position and passes through the needle hole 3, causing the top thread 12 and the bottom thread 13 to interweave in the fabric to form a stitch. During the retraction of the needle 2, the second moving blade 701 is controlled to move closer to the needle 2, while the first moving blade 601 moves synchronously. After the needle 2 retracts to the needle plate position, the first moving blade 601 moves to the fourth position, as shown. Figure 12 and Figure 13 As shown, the first cutting edge 6013 is positioned directly below the needle hole 3, and the second moving blade 701 continues to move closer to the needle 2 until the second cutting edge 7012 and the first cutting edge 6013 engage in shearing action to cut the surface thread 12, completing the thread trimming at the starting stage. Specifically, by engaging the second cutting edge 7012 on the second moving blade 701 with the first cutting edge 6013 on the first moving blade 601 to cut the surface thread 12, the thread size on the fabric 11 is equal to the vertical distance between the plane of the fabric 11 and the top surface of the first moving blade 601 plus the stitch length of a single needle. This maximizes the reduction of thread size at the starting stage, decreases thread ends in the garment, improves the efficiency of subsequent finishing processes, and enhances the sewing quality and aesthetics of the garment.

[0050] When the first moving blade 601 is in the sewing end stage and in the first position, and both the first moving blade 601 and the second moving blade 701 are located on the first side of the needle hole axis 4, the needle 2 rises back to the needle plate position, and the first moving blade 601 is controlled to move to the second position, so that the V-shaped groove 6012 is located on the second side of the needle hole axis 4, and the V-shaped thread separating tip 6011 separates the top thread 12 from the stitch on the fabric 11, so that the top thread 12 and the bottom thread 13 slide into the V-shaped groove 6012 through the second end of the first moving blade 601; the first moving blade 601 is controlled to push the top thread 12 and the bottom thread 13 to the fourth position, so that the first cutting edge 6013 is located directly below the needle hole 3, and the second moving blade 701 is controlled to continue to move towards the needle 2 until the second cutting edge 7012 and the first cutting edge 6013 shear together to cut the top thread 12 and the bottom thread 13, completing the thread cutting in the sewing end stage. The second cutting edge 7012 on the second moving blade 701 and the first cutting edge 6013 on the first moving blade 601 work together to cut the top thread 12 and the bottom thread 13, so that the size of the thread on the fabric 11 is equal to the vertical distance between the plane of the fabric 11 and the top surface of the first moving blade 601 plus the stitch length of a single needle. This maximizes the reduction of the thread size at the end of the sewing process, reduces the number of thread ends in the garment, avoids bird's nest-like tangles of thread, improves the efficiency of subsequent finishing, and enhances the sewing quality and aesthetics of the garment.

[0051] It should be further explained that the first moving blade mechanism 6 and the second moving blade mechanism 7 are arranged separately from the rotary hook 5 and the needle 2, resulting in a simple overall structure that does not require a large space. This allows them to be rationally arranged under the sewing machine needle plate 2. Moreover, the first moving blade mechanism 6 and the second moving blade mechanism 7 precisely coordinate their sewing actions during the starting and ending stages. While completing the thread cutting action, they do not interfere with the normal generation of the sewing thread loop, thereby avoiding sewing malfunctions, making sewing smoother, and effectively improving sewing efficiency.

[0052] In some embodiments of this utility model, the first moving blade mechanism 6 further includes: a first drive motor 602, optionally a stepper motor, the first drive motor 602 is fixedly connected to the housing 1, the output end of the first drive motor 602 is provided with a first drive shaft 603, the end of the first drive shaft 603 is provided with a first crank 604, one end of the first crank 604 is sleeved and connected to the first drive shaft 603, the other end of the first crank 604 is hinged and connected to a transmission rod 605, the transmission rod 605 is hinged and connected to a second crank 606, the other end of the second crank 606 is sleeved and connected to a first drive rod 607, and the upper end of the first drive rod 607 is sleeved and connected to the first end of the first moving blade 601. The first drive motor 602 drives the first drive shaft 603 to reciprocate. The first drive shaft 603 drives the transmission rod 605 to reciprocate through the first crank 604. The transmission rod 605 drives the first drive rod 607 to reciprocate through the second crank 606. While the first drive rod 607 is rotating, it drives the first moving blade 601 to reciprocate around the axis of the first drive rod 607.

[0053] In some embodiments of this utility model, the second moving blade mechanism 7 further includes: a second drive motor 702, optionally a stepper motor. The second drive motor 702 is fixedly connected to the housing 1. A second drive shaft 703 is provided at the output end of the second drive motor 702. A third crank 704 is provided at the end of the second drive shaft 703. One end of the third crank 704 is sleeved and connected to the second drive shaft 703, and the other end of the third crank 704 is rotatably connected to a second drive rod 705. The second drive rod 705 is rotatably connected to the second moving blade 701. The second drive motor 702 drives the second drive shaft 703 to reciprocate, and the second drive shaft 703 drives the second drive rod 705 to reciprocate through the third crank 704. The second drive rod 705 drives the second moving blade 701 to reciprocate along a second direction.

[0054] It should be noted that a guide rail plate 8 is provided on the housing 1. Specifically, an assembly groove is provided on the top surface of the housing 1, and the guide rail plate 8 is fixedly installed in the assembly groove by screws. A through guide hole 801 is provided on the top surface of the guide rail plate 8. The wire hole is generally strip-shaped, and the guide hole 801 extends along the second direction. The end of the second drive rod 705 away from the third crank 704 is rotatably connected to the rotating shaft 7051, such as... Figure 2 and Figure 3As shown, the right end of the second drive rod 705 is rotatably connected to the rotating shaft 7051, which passes through the guide hole 801. A fixing sleeve 7013 is provided at the left end of the second moving blade 701, rotatably connected to the rotating shaft 7051 to ensure that the second drive rod 705 can drive the second moving blade 701 to reciprocate. The guide hole 801 limits the movement path of the rotating shaft 7051, thereby improving the accuracy of the second moving blade 701 during movement.

[0055] Optionally, a limiting groove 802 is provided on the top surface of the guide plate 8. The limiting groove 802 extends along the second direction and is slidably connected to the second moving blade 701. The movement path of the second moving blade 701 is limited by the limiting groove 802 in conjunction with the guide hole 801, thereby further improving the accuracy of the second moving blade 701 during movement.

[0056] It should be noted that the second end of the second moving cutter 701 is provided with a cutter head 7011, the bottom surface of the cutter head 7011 is in contact with the top surface of the first moving cutter 601, and a second cutting edge 7012 is provided on the bottom edge of the cutter head 7011. The second cutting edge 7012 extends along a third direction, which is perpendicular to both the first and second directions. Figure 7 In the Z-direction, the second cutting edge 7012 can form a shear with the first cutting edge 6013 to ensure the shear line 12 and / or bottom line 13.

[0057] In some embodiments of this utility model, a suction pipe 9 is provided on the housing 1. The suction pipe 9 is connected to an exhaust device (not shown in the figure), and the upper opening of the suction pipe 9 is located below the first moving blade 601, while the lower opening of the suction pipe 9 is located inside the collection device (not shown in the figure). After the thread 12 is cut, the movement of the second moving blade 701 is controlled to disengage the first cutting edge 6013 from the second cutting edge 7012, and the first moving blade 601 disengages from the pressure plate 10. At this time, the exhaust device draws the cut thread ends into the collection device through the suction pipe 9 for centralized collection, ensuring the cleanliness of the sewing process, preventing thread ends from entering the sewing machine and causing malfunctions, and ensuring the stable operation of the sewing equipment.

[0058] In some embodiments of this utility model, a pressure plate 10 is provided on the housing 1. The pressure plate 10 is located below the first moving blade 601, and the top surface of the pressure plate 10 is in contact with the bottom surface of the first moving blade 601. Through the cooperation between the pressure plate 10 and the first moving blade 601, after the top thread 12 and / or bottom thread 13 enter the V-groove 6012, the first moving blade 601 is controlled to move towards the pressure plate 10, which can clamp and fix a section of top thread 12 and / or bottom thread 13 located below the first moving blade 601. Thus, when the second cutting edge 7012 and the first cutting edge 6013 are engaged in shearing, the top thread 12 and / or bottom thread 13 can be cut quickly and stably.

[0059] It should be noted that the top surface of the pressure plate 10 protrudes with a certain arc towards the first moving blade 601, thereby ensuring that the top thread 12 enters the V-shaped groove 6012. Furthermore, after the first moving blade 601 moves above the pressure plate 10, it ensures that the bottom surface of the first moving blade 601 is in contact with the top surface of the pressure plate 10, clamping and fixing a section of the top thread 12 located below the first moving blade 601. When the second cutting edge 7012 and the first cutting edge 6013 engage in shearing, the top thread 12 can be cut quickly and stably. Additionally, a through hole is provided on the top surface of the pressure plate 10, located directly above the upper opening of the suction pipe 9. After the top thread 12 is cut, the thread end can pass through the through hole and directly enter the upper opening of the suction pipe 9, providing a certain path guide for the thread end and ensuring that the thread end can be accurately sucked into the suction pipe 9.

[0060] In some embodiments of this utility model, a V-shaped groove 6014 is provided on the top surface of the first moving blade 601, and a first cutting edge 6013 is formed on the upper edge of the V-shaped groove 6014 near the V-shaped dividing tip 6011. It should be noted that the first cutting edge 6013 is an arc-shaped corner at the position of the upper edge of the V-shaped groove 6012.

[0061] Alternatively, a through cylindrical hole 6015 can be provided at the right end of the V-groove 6012. The upper edge of the cylindrical hole 6015 is the first cutting edge 6013, which is generally arc-shaped. Furthermore, the axis of the cylindrical hole 6015 is designed to be inclined, that is, the axis of the cylindrical hole 6015 has a certain acute angle with the first direction, so that the first cutting edge 6013 has a smaller sharp angle and improves the sharpness of the first cutting edge 6013. When the second moving blade 701 moves to the right relative to the first moving blade 601, it ensures that the first cutting edge 6013 and the second cutting edge 7012 can more easily cut the top line 12 and the bottom line 13, improving the reliability of the overall cutting process.

[0062] Furthermore, an arc-shaped groove 6016 is provided at the end of the V-shaped groove 6014 away from the V-shaped thread dividing tip 6011. The arc-shaped groove 6016 can further limit the top thread 12 and bottom thread 13 at the position of the V-shaped groove 6012. During the sewing stage, the top thread 12 is controlled to cooperate with the pressure plate 10 to press the top thread, ensuring that the first moving blade 601 can cooperate with the pressure plate 10 to stably clamp and fix the top thread 12, making the thread cutting more stable. During the sewing end stage, the arc-shaped groove 6016 can prevent the top thread 12 and bottom thread 13 at the position of the V-shaped groove 6012 from moving back and forth in the V-shaped groove 6012 with the movement of the first moving blade 601, making the thread cutting more stable.

[0063] The working principle of this utility model is as follows: When the first moving blade 601 is in the starting stage and located in the first position, and both the first moving blade 601 and the second moving blade 701 are located to the left of the needle hole axis 4, the first drive motor 602 is controlled to move the first moving blade 601 from the first position to the second position, so that the V-shaped groove 6012 is located to the right of the needle hole axis 4. The needle 2 descends from the needle plate position and passes through the needle hole 3 for the first time, so as to bring the top thread 12 into the position of the rotary hook 5. The rotary hook 5 hooks the top thread 12 during rotation. After the needle 2 rises back to the needle plate position, the first drive motor 602 is controlled to move the first moving blade 601 from the first position to the third position, so that the V-shaped thread dividing tip 6011 is located to the left of the needle hole axis 4, and the top thread 12 enters the V-shaped groove 6012, so that a section of the top thread 12 below the first moving blade 601 is controlled by the first moving blade 601 and the pressure plate 1. 0. Clamping and fixing; the needle 2 descends again from the needle plate position and passes through the needle hole 3, causing the top thread 12 and the bottom thread 13 to interweave in the sewing fabric to form a stitch. During the retraction of the needle 2, the second drive motor 702 is controlled to drive the second moving blade 701 to move closer to the needle 2, while the first drive motor 602 is controlled to drive the first moving blade 601 to move synchronously. After the needle 2 returns to the needle plate position, the first moving blade 601 moves to the fourth position, so that the first cutting edge 6013 is directly below the needle hole 3. The second moving blade 701 is controlled to continue moving closer to the needle 2 until the second cutting edge 7012 and the first cutting edge 6013 engage to cut the top thread 12, completing the thread cutting. Further, the second drive motor 702 is controlled to drive the second moving blade 701 back to the initial position, while the first drive motor 602 is controlled to drive the first moving blade 601 to move to the fifth position. Figure 14 and Figure 15 As shown, the first cutting edge 6013 is disengaged from the second cutting edge 7012, and the first moving blade 601 is disengaged from the wire pressing plate 10. The exhaust device draws the cut wire ends into the collection device through the suction pipe 9 for centralized collection.

[0064] When the first moving blade 601 is in the sewing end stage and located in the first position, and both the first moving blade 601 and the second moving blade 701 are located to the left of the needle hole axis 4, such as Figure 16 As shown, the needle 2 rises back to the needle plate position, controlling the first drive motor 602 to drive the first moving blade 601 to the second position, as... Figure 17 As shown, the V-groove 6012 is positioned to the right of the needle hole axis 4, and the V-shaped thread separating tip 6011 separates the top thread 12 from the stitches on the fabric 11, so that the top thread 12 and the bottom thread 13 slide into the V-groove 6012 through the second end of the first moving blade 601; the first drive motor 602 is controlled to drive the first moving blade 601 to push the top thread 12 and the bottom thread 13 to the fourth position, as shown. Figure 18As shown, the first cutting edge 6013 is positioned directly below the needle hole 3. The second drive motor 702 is controlled to drive the second moving blade 701 to continue moving towards the needle 2 until the second cutting edge 7012 and the first cutting edge 6013 engage in shearing to cut the surface line 12 and the bottom line 13, thus completing the thread cutting.

[0065] In summary, by using the second cutting edge 7012 on the second moving blade 701 and the first cutting edge 6013 on the first moving blade 601 to cut the top thread 12, and by using the second cutting edge 7012 on the second moving blade 701 and the first cutting edge 6013 on the first moving blade 601 to cut the top thread 12 and the bottom thread 13 at the end of the sewing stage, the size of the thread on the fabric 11 is equal to the vertical distance between the plane of the fabric 11 and the top surface of the first moving blade 601 plus the stitch length of a single needle. This maximizes the reduction of the thread size at the beginning and end of the sewing stages, effectively reducing thread ends in the garment, avoiding bird's nest-like tangles, and effectively improving the sewing quality and aesthetics of the garment.

[0066] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0067] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A double-blade wire cutting device, characterized in that, include: A housing (1) is provided with a needle plate and a needle (2). A needle hole (3) is provided on the needle plate. The needle (2) reciprocates along a first direction and passes through the needle hole (3). A rotary hook (5) is provided inside the housing (1). The rotary hook (5) can be driven to rotate to cooperate with the movement of the needle (2). The first moving tool mechanism (6) includes: A first moving blade (601) is disposed on one side of the needle plate. The first end of the first moving blade (601) is sleeved and connected to a first driving rod (607). A V-shaped dividing tip (6011) is provided on the first side of the second end of the first moving blade (601). A V-shaped groove (6012) is provided on the second side of the second end of the first moving blade (601). A first cutting edge (6013) is formed at the end of the V-shaped groove (6012) near the V-shaped dividing tip (6011). The first driving rod (607) can be driven to drive the first moving blade (601) to reciprocate around the axis of the first driving rod (607). The second moving tool mechanism (7) includes: The second moving blade (701) is disposed on one side of the needle plate. The first end of the second moving blade (701) is connected to the second driving rod (705). The second driving rod (705) extends along the second direction. The second end of the second moving blade (701) is provided with a second cutting edge (7012). The second driving rod (705) can be driven to drive the second moving blade (701) to reciprocate along the second direction. The second direction is perpendicular to the first direction.

2. The double-blade wire cutting device according to claim 1, characterized in that, The first moving blade mechanism (6) further includes: a first drive motor (602) fixedly connected to the housing (1), the output end of the first drive motor (602) is provided with a first drive shaft (603), the end of the first drive shaft (603) is sleeved with a first crank (604), the first crank (604) is rotatably connected to a transmission rod (605), the transmission rod (605) is rotatably connected to a second crank (606), the other end of the second crank (606) is sleeved with the first drive rod (607), and the upper end of the first drive rod (607) is sleeved with the first moving blade (601).

3. The double-blade wire cutting device according to claim 2, characterized in that, The second moving blade mechanism (7) further includes: a second drive motor (702) fixedly connected to the housing (1), a second drive shaft (703) provided at the output end of the second drive motor (702), a third crank (704) sleeved at the end of the second drive shaft (703), the other end of the third crank (704) being rotatably connected to a second drive rod (705), and the second drive rod (705) being rotatably connected to the second moving blade (701).

4. A double-blade wire cutting device according to claim 3, characterized in that, The housing (1) is provided with a guide plate (8), and the top surface of the guide plate (8) is provided with a through guide hole (801). The guide hole (801) extends along the second direction. The end of the second drive rod (705) away from the third crank (704) is rotatably connected to the rotating shaft (7051). The rotating shaft (7051) passes through the guide hole (801). The end of the second moving knife (701) away from the needle plate is provided with a fixing sleeve (7013). The fixing sleeve (7013) is rotatably connected to the rotating shaft (7051).

5. A double-blade wire cutting device according to claim 4, characterized in that, The top surface of the guide plate (8) is provided with a limiting groove (802), the limiting groove (802) extends along the second direction, and the limiting groove (802) is slidably connected to the second moving blade (701).

6. A double-blade wire cutting device according to any one of claims 1-5, characterized in that, The second end of the second moving blade (701) is provided with a blade head (7011), the bottom surface of the blade head (7011) is in contact with the top surface of the first moving blade (601), and the bottom edge of the blade head (7011) is provided with a second cutting edge (7012), the second cutting edge (7012) extends along a third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

7. A double-blade wire cutting device according to any one of claims 1-5, characterized in that, The housing (1) is provided with a suction pipe (9), which is connected to a ventilation device. The upper opening of the suction pipe (9) is located below the first moving blade (601), and the lower opening of the suction pipe (9) is located inside the collection device.

8. A double-blade wire cutting device according to claim 7, characterized in that, A pressure plate (10) is provided on the housing (1). The pressure plate (10) is located below the first moving blade (601), and the top surface of the pressure plate (10) is attached to the bottom surface of the first moving blade (601).

9. A double-blade wire cutting device according to claim 8, characterized in that, The top surface of the pressure plate (10) is provided with a through hole, which is located directly above the upper opening of the suction pipe (9).

10. A double-blade wire cutting device according to any one of claims 1-5, characterized in that, The top surface of the first moving blade (601) is provided with a V-shaped groove (6014), and the upper edge of the V-shaped groove (6014) near the V-shaped dividing tip (6011) forms the first cutting edge (6013). The end of the V-shaped groove (6014) away from the V-shaped dividing tip (6011) is provided with an arc-shaped groove (6016).

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