Automatic surface and bottom thread cutting device of overlock sewing machine

Abstract

The utility model discloses an automatic surface and bottom thread cutting device of an overlock sewing machine, and belongs to the technical field of sewing instruments. Comprising a top plate and a bottom plate which are detachably and sequentially arranged from top to bottom, a sliding groove is reserved in one side of the top of the bottom plate, a guide hole penetrating through the bottom plate is formed in the bottom of the sliding groove, and a sliding block is slidably installed in the sliding groove; a movable rod is fixed to the bottom of the sliding block, penetrates through the bottom plate through a guide hole and is movably connected with the bottom plate. A fixed cutter is mounted on the other side of the top of the bottom plate; an air cylinder is arranged at the bottom of the top plate, and an air cylinder push block is fixed to the end of a telescopic rod of the air cylinder and pushes the movable rod to enable the sliding block to move in the sliding groove. At least one movable cutter is further arranged between the top plate and the bottom plate, one end of the movable cutter is detachably fixed to the top of the sliding block, the other end of the movable cutter is provided with a hook cutter and a cutter which are consistent in opening direction, and the opposite faces of the cutter and the fixed cutter are provided with obliquely-staggered cutter edges. The overlock sewing machine solves the problem that an existing overlock sewing machine is low in thread cutting efficiency for multi-thread sewing.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, and more specifically, to an automatic thread cutting device for overlock sewing machines. Background Technology

[0002] Overlock sewing machines, also known as edge-sealing machines or circular sewing machines, can be used for edge sealing of products and sewing of fabrics. Overlock stitches can be divided into single-thread, double-thread, triple-thread, four-thread, and five-thread stitches.

[0003] Currently, the thread trimming step after sewing on an overlock sewing machine is basically done manually. When trimming, a 3-5 cm margin is usually left to facilitate splicing before the next sewing. However, manual thread trimming is inefficient and also has a high risk factor. Some overlock sewing machines are equipped with a thread cutter, which is usually located above the needle plate. After the needle plate is raised, the switch can be manually activated to trim the thread. When sewing multiple threads, the thread cutter usually needs to be equipped with a moving platform to trim the threads one by one. This method is inefficient and the cost of setting up the moving platform is also increased. Utility Model Content

[0004] To overcome the problem of low thread cutting efficiency of current overlock sewing machines for multi-thread seams mentioned in the background art, this utility model provides an automatic face and bottom thread cutting device for overlock sewing machines.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] An automatic overlock sewing machine thread cutting device includes a detachable top plate and a bottom plate arranged sequentially. A groove is reserved on one side of the top of the bottom plate, and a guide hole is provided at the bottom of the groove to penetrate the bottom plate. A slider is slidably installed in the groove. A movable rod is fixed at the bottom of the slider, and the movable rod passes through the guide hole and is movably connected to the bottom plate. A fixed knife is installed on the other side of the top of the bottom plate.

[0007] A cylinder is provided at the bottom of the top plate. A cylinder push block is fixed to the end of the cylinder's telescopic rod. The cylinder push block and the top of the movable rod are assembled and fixed. The cylinder push block pushes the movable rod to make the slider move in the slide groove.

[0008] At least one moving blade is also provided between the top plate and the bottom plate. One end of the moving blade is detachably fixed to the top of the slider, and the other end of the moving blade is provided with a hook blade and a cutter blade with the same opening direction. The opposite surfaces of the cutter blade and the fixed blade are provided with inclined and staggered blade edges.

[0009] In the above embodiment, by setting at least one moving blade and using the telescopic rod of a cylinder to push the slider to move within the groove, the moving blade performs three actions: the first action is to move forward, where the hook blade captures the thread; the second action is to move forward again, allowing the thread to enter the cutter; and the third action is to retract, allowing the cutter to enter the fixed blade position. The two actions work together to cut the thread. The above process can be carried out with multiple moving blades working together, which is more efficient than the thread cutter that needs to move the cutting blades sequentially when cutting multiple threads.

[0010] Preferably, both ends of the top plate are provided with fixing plates, and the top plate can be detachably fixed to the top of the overlock sewing machine needle plate via the machine body fixing plate.

[0011] Preferably, a cylinder positioning block is provided on the top of the cylinder, and the cylinder is detachably fixed to the bottom of the top plate through the cylinder positioning block.

[0012] Preferably, a guide rod parallel to the telescopic rod is provided on the end face of the cylinder pusher facing the cylinder, and one end of the guide rod is movably installed inside the cylinder.

[0013] Preferably, a locking block is fixed on the side of the cylinder push block facing the movable rod, and a locking groove is provided on the top of the locking block, and the bottom of the movable rod is movably locked inside the locking groove.

[0014] Preferably, a protective plate is fixed to the top of the fixed blade, and the cutting end of the fixed blade does not exceed the side of the protective plate and the bottom plate opposite to the cutting blade.

[0015] Preferably, a moving blade connector is provided on the side of the moving blade opposite to the cutting blade, and the moving blade connector is annular.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the automatic thread cutting device for overlock sewing machines provided in this application can cut multiple threads simultaneously by moving the moving blade in one direction and cooperating with the fixed blade, which is more efficient than the existing thread cutter. Attached Figure Description

[0017] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the top structure of the bottom plate after the top plate has been removed according to this utility model;

[0020] Figure 3 This is a schematic diagram of the slider and cylinder assembly structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the working structure of the fixed blade and the moving blade of this utility model;

[0022] Figure 5 This is a schematic diagram of the movable rod and slider structure of this utility model.

[0023] In the diagram: 1. Top plate; 2. Bottom plate; 3. Machine body fixing plate; 4. Cylinder; 5. Cylinder positioning block; 6. Telescopic rod; 7. Guide rod; 8. Cylinder push block; 9. Locking block; 10. Locking groove; 11. Movable rod; 12. Fixed blade; 13. Moving blade; 14. Slide groove; 15. Guide hole; 16. Sliding block; 17. Protective plate; 18. Hook blade; 19. Cutting blade; 20. Moving blade connecting piece. Detailed Implementation

[0024] To better understand the purpose, structure, and function of this utility model, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific preferred embodiments.

[0025] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in the embodiments are only for illustrating the technical solution and do not limit the scope of protection of this utility model. It is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings for those skilled in the art.

[0026] Unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," and "fixation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] Example:

[0028] This utility model provides an automatic thread cutting device for the top and bottom threads of an overlock sewing machine, which is installed on the top of the needle plate of the overlock sewing machine. Figure 1As shown, it includes a detachable top plate 1 and a bottom plate 2 arranged sequentially from top to bottom. Both ends of the top plate 1 are provided with fixing plates 3. The top plate 1 can be detachably fixed to the top of the overlock sewing machine needle plate via the machine body fixing plates 3.

[0029] like Figure 2-3 As shown, to connect the moving blade 13, a groove 14 is reserved on one side of the top of the base plate 2. A guide hole 15 is provided at the bottom of the groove 14, penetrating the base plate 2. A slider 16 is slidably installed in the groove 14. A movable rod 11 is fixed at the bottom of the slider 16. The movable rod 11 passes through the guide hole 15 and is movably connected to the base plate 2. A fixed blade 12 is installed on the other side of the top of the base plate 2. A linear output device is connected to the bottom of the movable rod 11. After the movable rod 11 is pushed, the slider 16, whose top is located in the groove 14, moves left and right in the groove, so that the moving blade 13 has a telescopic movement inside the entire top plate 1 and base plate 2.

[0030] like Figure 1 , Figure 3 and Figure 5 As shown, cylinder 4 provides linear output for movable rod 11 and slider 16. Cylinder 4 is provided at the bottom of top plate 1. Cylinder push block 8 is fixed at the end of telescopic rod 6 of cylinder 4. Cylinder push block 8 is assembled and fixed at the top of movable rod 11. Cylinder push block 8 pushes movable rod 11 to make slider 16 move in slide groove 14.

[0031] like Figure 2 and Figure 4 As shown, at least one movable blade 13 is also provided between the top plate 1 and the bottom plate 2. One end of the movable blade 13 is detachably fixed to the top of the slider 16, and the other end of the movable blade 13 is provided with a hook blade 18 and a cutter blade 19 with the same opening direction. The opposite surfaces of the cutter blade 19 and the fixed blade 12 are provided with inclined and staggered blade edges. In the first step, the hook blade 18 at one end of the movable blade 13 moves down to hook the sewing thread. When it is necessary to cut the thread, the movable blade 13 extends further to let the sewing thread enter the cutter blade 19, and continues to retract so that the blade surfaces of the hook blade 18 and the fixed blade 12 cooperate to cut the thread.

[0032] It should be noted that the purpose of hook 18 is for multi-thread cutting. During overlock sewing, the threads may not be at the same height; in many cases, such as... Figure 4 As shown, the extension distance of the moving blade 13 is inconsistent. Using the hook blade 18 can grab the thread faster when cutting the thread, which is convenient for subsequent thread cutting work.

[0033] As a preferred embodiment of the above, to facilitate the installation and disassembly of cylinder 4, such as... Figure 1 and Figure 3 As shown, a cylinder positioning block 5 is provided on the top of the cylinder 4. The cylinder 4 can be detachably fixed to the bottom of the top plate 1 through the cylinder positioning block 5. The cylinder positioning block 5 is a nut-like component with an internal thread hole on the top, which makes it convenient to fix the cylinder 4 from the top of the top plate 1 with bolts.

[0034] As a preferred embodiment of the above, such as Figure 1 As shown, a guide rod 7 parallel to the telescopic rod 6 is provided on one end face of the cylinder push block 8 facing the cylinder 4. One end of the guide rod 7 is movably installed inside the cylinder 4, and the guide rod 7 provides guidance when the telescopic rod 6 moves.

[0035] As a preferred embodiment of the above, such as Figure 1 As shown, to facilitate the disassembly of the movable rod 11 and the cylinder push block 8, a locking block 9 is fixed on the side of the movable rod 11 and the cylinder push block 8 facing the movable rod 11. A locking groove 10 is provided on the top of the locking block 9, and the bottom of the movable rod 11 is movably engaged in the locking groove 10. The movable rod 11 is installed and fixed by engaging the locking groove 10 on the locking block 9 with the bottom of the movable rod 11, which facilitates the installation of the movable rod 11.

[0036] As a preferred embodiment of the above, such as Figure 1 As shown, to ensure the safety of the device, a protective plate 17 is fixed to the top of the fixed blade 12, and the cutting end of the fixed blade 12 does not exceed the protective plate 17 and the side of the bottom plate 2 opposite to the cutter 19.

[0037] As a preferred embodiment of the above, such as Figure 2 As shown, a moving blade connector 20 is provided on the side of the moving blade 13 opposite to the cutting blade 19. The moving blade connector 20 is annular. When fixed, the moving blade 13 and the sliding block 16 can be quickly disassembled and assembled by passing a bolt through the hole in the middle of the moving blade connector 20 and fixing it with the threaded assembly hole on the top of the sliding block 16 below.

[0038] It should be noted that multiple parts, including the top plate 1, bottom plate 2, body fixing plate 3, cylinder positioning block 5, cylinder push block 8, slider 16, and protective plate 17, are provided with assembly holes for assembly. The corresponding parts are fixed together by bolts, which can be clearly shown in the attached drawings and will not be described again in this application.

[0039] The specific working steps of this application are as follows: The top plate 1 and the bottom plate 2 are fixed to the top of the overlock sewing machine needle plate by the fixing plate 3 and bolts. After adjusting the position, they are ready to work. When it is necessary to cut the thread, the control unit starts the cylinder 4. The telescopic rod 6 of the cylinder 4 pushes the movable rod 11 to make the slider 16 move in the slide groove 14. This further moves the hook knife 18 and the cutter 19 on the side of the moving knife 13 toward the sewing thread. Then the first action occurs: the hook knife 18 hooks the sewing thread, further driving the moving knife 13 to move, allowing the sewing thread to enter the cutter 19 to complete the second action. Finally, the moving knife 13 is retracted and enters the interior of the top plate 1 and the bottom plate 2. The moving knife 13 and the fixed knife 12 cooperate to cut the thread.

[0040] Compared to existing thread cutters, the automatic thread cutting device for overlock sewing machines described in this application can cut multiple threads simultaneously, resulting in higher cutting efficiency.

[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An automatic thread cutting device for the top and bottom threads of an overlock sewing machine, characterized in that, The device includes a detachable top plate (1) and a bottom plate (2) arranged sequentially. A groove (14) is reserved on one side of the top of the bottom plate (2). A guide hole (15) penetrating the bottom plate (2) is provided at the bottom of the groove (14). A slider (16) is slidably installed in the groove (14). A movable rod (11) is fixed at the bottom of the slider (16). The movable rod (11) passes through the guide hole (15) through the bottom plate (2) and is movably connected to the bottom plate (2). A fixed blade (12) is installed on the other side of the top of the bottom plate (2). A cylinder (4) is provided at the bottom of the top plate (1). A cylinder push block (8) is fixed at the end of the telescopic rod (6) of the cylinder (4). The cylinder push block (8) and the movable rod (11) are assembled and fixed at the top. The cylinder push block (8) pushes the movable rod (11) so that the slider (16) moves in the slide groove (14). At least one moving blade (13) is provided between the top plate (1) and the bottom plate (2). One end of the moving blade (13) is detachably fixed to the top of the slider (16). The other end of the moving blade (13) is provided with a hook blade (18) and a cutter blade (19) with the same opening direction. The opposite surfaces of the cutter blade (19) and the fixed blade (12) are provided with inclined and staggered blade edges.

2. The automatic overlock sewing machine thread cutting device according to claim 1, characterized in that, The top plate (1) is provided with fixing plates (3) at both ends of the top. The top plate (1) can be detachably fixed to the top of the sewing machine needle plate via the machine body fixing plates (3).

3. The automatic face and bottom thread cutting device for overlock sewing machines according to claim 1, characterized in that, A cylinder positioning block (5) is provided on the top of the cylinder (4), and the cylinder (4) is detachably fixed to the bottom of the top plate (1) through the cylinder positioning block (5).

4. The automatic face and bottom thread cutting device for overlock sewing machines according to claim 1, characterized in that, The cylinder pusher block (8) has a guide rod (7) parallel to the telescopic rod (6) on one end face facing the cylinder (4), and one end of the guide rod (7) is movably installed inside the cylinder (4).

5. The automatic face and bottom thread cutting device for overlock sewing machines according to claim 1, characterized in that, The cylinder push block (8) has a locking block (9) fixed on the side facing the movable rod (11). The top of the locking block (9) is provided with a locking groove (10), and the bottom of the movable rod (11) is movably locked inside the locking groove (10).

6. The automatic face and bottom thread cutting device for overlock sewing machines according to claim 1, characterized in that, The top of the fixed blade (12) is fixed with a protective plate (17), and the cutting end of the fixed blade (12) does not exceed the protective plate (17) and the bottom plate (2) on the side opposite to the cutter (19).

7. The automatic face and bottom thread cutting device for overlock sewing machines according to claim 1, characterized in that, The moving blade (13) is provided with a moving blade connector (20) on one side opposite to the cutting blade (19), and the moving blade connector (20) is annular.

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