Cutter head structure capable of preventing bottom thread from falling off and sewing equipment

Abstract

The utility model relates to a cutter head structure capable of preventing a bottom thread from falling off and sewing equipment, and the cutter head structure capable of preventing the bottom thread from falling off comprises a first cutter rest and a second cutter rest, the second knife rest is movably matched with the first knife rest, the second knife rest has a thread hooking stroke and a thread trimming stroke according to the relative movement direction of the second knife rest and the first knife rest, a movable knife is fixed to the second knife rest, and the movable knife is matched with the fixed knife and shears the sewing thread in the thread trimming stroke; the thread loosening piece is slidably mounted on the second knife rest, and the sewing thread movably penetrates through the thread loosening piece; the elastic piece acts between the first knife rest and the thread loosening piece, the thread loosening piece is blocked by the first knife rest and stores energy in the elastic piece in the thread hooking stroke, the thread loosening piece moves backwards relative to the second knife rest, the elastic piece resets in the thread cutting stroke, and the thread loosening piece moves forwards relative to the second knife rest to lag in thread loosening. According to the technical scheme, a thread loosening delaying structure is achieved, threads are prevented from being disengaged, the thread trimming stability of the thread trimming cutter head is greatly improved, and the adaptability of the thread trimming cutter head to various threads is improved.

Description

Technical Field

[0001] This application relates to the field of sewing equipment technology, and more particularly to a cutter head structure for preventing bobbin thread from slipping out and a sewing device. Background Technology

[0002] A sewing machine is a machine that uses one or more threads to create one or more stitches on fabric, allowing one or more layers of fabric to interweave or sew together. Sewing machines are widely used in the garment manufacturing industry, especially large-scale sewing machines used in factories, which are even more widely used in production enterprises that manufacture garments in batches.

[0003] Currently, most industrial sewing machines are equipped with automatic thread trimming devices to save labor, electricity, and manpower. The automatic thread trimming device of a sewing machine typically consists of a movable blade and a cooperating fixed blade. The movable blade has a thread-hooking groove. During the thread trimming process, the movable blade moves to the vicinity of the thread and uses the thread-hooking groove to pull the thread back to the fixed blade, thus achieving thread trimming.

[0004] In existing technology, the thread cutter disc is equipped with a thread loosening plate for controlling the tension of the thread. The thread loosening plate is fixed to the moving thread cutter and moves with the movement of the moving thread cutter. When the moving blade returns to its original position, the thread loosening plate begins to loosen the thread, and the thread loops loosen to match the thread tension with the movement of the thread cutter disc. However, during the return process of the moving blade, the loosened thread can easily slip out of the hook groove of the moving blade, seriously affecting the stability of thread cutting, and further affecting production efficiency and safety. Utility Model Content

[0005] This application provides a cutting disc structure that prevents the thread from coming loose, realizing a delayed thread loosening structure, preventing the thread from coming loose, greatly improving the thread cutting stability of the cutting disc, and enhancing the adaptability of the cutting disc to various types of threads.

[0006] One cutter head structure for preventing bottom line ejection according to this application includes:

[0007] The first tool holder has a fixed tool;

[0008] The second blade holder moves in coordination with the first blade holder. The second blade holder has a hooking stroke and a cutting stroke in the direction of relative movement with the first blade holder. The second blade holder has a fixed moving blade, which works in coordination with the fixed blade and cuts the thread during the cutting stroke.

[0009] A loosening piece is slidably mounted on the second knife holder, and the sewing thread is movably passed through the loosening piece;

[0010] An elastic element acts between the first blade holder and the loosening strip. During the hooking stroke, the loosening strip is blocked by the first blade holder and energy is stored in the elastic element. The loosening strip moves backward relative to the second blade holder. During the cutting stroke, the elastic element returns to its original position, and the loosening strip moves forward relative to the second blade holder to delay the loosening of the wire.

[0011] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0012] In one embodiment, a cooperating guide structure is provided between the second tool holder and the loosening blade.

[0013] In one embodiment, the loosening blade slides relative to the second tool holder along a first direction, and the second tool holder slides relative to the first tool holder along a second direction, the first direction being parallel to the second direction.

[0014] In one embodiment, the guide structure includes:

[0015] A guide hole, which is strip-shaped and extends along a first direction, is provided in one of the loosened wire plate and the second tool holder;

[0016] A guide pin is inserted through the guide hole and is fixed to the other of the loose wire piece and the second tool holder.

[0017] In one embodiment, the guide holes are at least two arranged side by side, and the guide pins are configured accordingly.

[0018] In one embodiment, the second tool holder has a support, and the elastic element is a compression spring that presses against the support and the loose wire piece.

[0019] In one embodiment, the support has a mounting hole, and the loose wire has a guide rod that moves through the mounting hole.

[0020] In one embodiment, the elastic element is a helical spring and is sleeved on the guide rod.

[0021] In one embodiment, the edge of the loosening piece has a limiting step, and at the end of the hooking stroke, the limiting step directly abuts against the first tool holder and / or the fixed tool.

[0022] This application also discloses a sewing device, including the cutter head structure described in this application for preventing the bobbin thread from slipping out.

[0023] The technical solution disclosed in this application optimizes the coordination of the thread loosening plate, the moving blade, and the fixed blade to achieve a delayed thread loosening cutter head structure. When the moving blade returns, the thread loosening plate will not move immediately with the moving blade under the action of the elastic element, so as to ensure the stability of the thread cutting action. When the moving blade returns to a certain distance, it drives the thread loosening plate to start loosening the thread, ensuring the tautness of the sewing thread and the synchronicity of the thread cutting action. This effectively improves production efficiency and ensures production safety. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the cutter head structure for preventing the bottom line from coming off in one embodiment of this application;

[0026] Figure 2 A schematic diagram of the structure through which the stitches pass;

[0027] Figure 3 for Figure 1 A schematic diagram showing the assembly of the various components of the cutter head structure;

[0028] Figure 4 This is a schematic diagram of the cutter head structure with the elastic element in a free state.

[0029] Figure 5 This is a schematic diagram of the cutterhead structure with elastic elements in the energy storage state.

[0030] The component labels are as follows:

[0031] 100. First tool holder; 110. Fixed tool;

[0032] 200. Second tool holder; 210. Moving tool; 211. Hook groove; 220. Support; 221. Mounting hole;

[0033] 300, Loosening plate; 310, Guide hole; 320, Guide pin; 330, Guide rod; 340, Limiting step; 350, Threading part; 351, Threading hole; 360, Sliding part;

[0034] 400. Elastic components;

[0035] 500. Sewing thread;

[0036] 600, base plate; 610, drive lever; 620, constraint lever. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level (or in a usage state, or from a certain viewpoint in the drawing) than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level (or in a usage state, or from a certain viewpoint in the drawing) than the second feature.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0042] See appendix Figure 1 and attached Figure 2 As shown, this application discloses a cutter head structure to prevent the bottom line from coming out, comprising:

[0043] The first tool holder 100 has a fixed tool 110;

[0044] The second blade holder 200 moves in coordination with the first blade holder 100. The second blade holder 200 has a hooking stroke and a cutting stroke in the direction of relative movement with the first blade holder 100. The second blade holder 200 is fixed with a moving blade 210. The moving blade 210 cooperates with the fixed blade 110 and cuts the sewing thread 500 in the cutting stroke.

[0045] The loose thread piece 300 is slidably installed on the second cutter holder 200, and the sewing thread 500 is movably guided through the loose thread piece 300;

[0046] The elastic element 400 acts between the first tool holder 100 and the loosening piece 300. During the hooking stroke, the loosening piece 300 is blocked by the first tool holder 100 and stores energy in the elastic element 400. The loosening piece 300 moves backward relative to the second tool holder 200. During the cutting stroke, the elastic element 400 returns to its original position, and the loosening piece 300 moves forward relative to the second tool holder 200 to delay the loosening of the wire.

[0047] The technical solution disclosed in this application optimizes the coordination of the loosening plate 300, the moving blade 210, and the fixed blade 110, thereby achieving a delayed loosening cutter head structure. When the moving blade 210 returns to its original position, the loosening plate 300 will not immediately move with the moving blade 210 under the action of the elastic element 400, thus ensuring the stability of the thread cutting action. When the moving blade 210 returns to a certain distance, it drives the loosening plate 300 to begin loosening the thread, ensuring the taut state of the sewing thread 500 and the synchronization of the thread cutting action. This effectively improves production efficiency and ensures production safety.

[0048] For the specific structure of the loose thread 300, please refer to the appendix. Figure 3 In the illustrated embodiment, the loose thread piece 300 includes a sliding portion 360 slidably fitted onto the second blade holder 200 and a thread-passing portion 350 extending outward from the sliding portion 360. The thread-passing portion 350 extends to the side of the second blade holder 200 and / or the movable blade 210. The thread-passing portion 350 is provided with a thread-passing hole 351 for the sewing thread 500 to pass through. To improve the adaptability of the loose thread piece 300 to different scenarios, the thread-passing portion 350 is provided with multiple thread-passing holes 351. For example, see attached... Figure 3 In the middle, the thread hole 351 has two thread holes 351 with different diameters and shapes for different sutures 500.

[0049] For details on the fit of each component, please refer to the appendix. Figure 2 and attached Figure 3In the illustrated embodiment, the second blade holder 200 and the first blade holder 100 are stacked on top of each other. The fixed blade 110 and the first blade holder 100 are attached to the movable blade 210 from the top and bottom sides. When the movable blade 210 pulls the thread 500 back to the fixed blade 110 through the thread groove 211, the cutting action is achieved. The loose thread piece 300 is connected to the side of the second blade holder 200 facing the fixed blade 110 and is at the same height as the fixed blade 110.

[0050] A cooperating guide structure is provided between the second tool holder 200 and the loosening blade 300. The guide structure includes:

[0051] Guide hole 310, guide hole 310 is strip-shaped and extends along the first direction, guide hole 310 is opened in one of the loose wire plate 300 and the second tool holder 200;

[0052] A guide pin 320 is inserted through a guide hole 310 and is fixed to the other of the loose wire piece 300 and the second tool holder 200.

[0053] In this embodiment, the guide hole 310 is located on the loosened wire sheet 300, and the guide pin 320 passes through the guide hole 310 and is mounted on the second tool holder 200. Furthermore, there are at least two guide holes 310 arranged side-by-side, with corresponding guide pins 320. The side-by-side arrangement of guide holes 310 can improve the movement accuracy of the loosened wire sheet 300.

[0054] See appendix Figure 4 To be continued Figure 5 In the illustrated embodiment, the loose wire piece 300 slides relative to the second tool holder 200 along a first direction, and the second tool holder 200 slides relative to the first tool holder 100 along a second direction, the first direction being parallel to the second direction. The movement direction of the loose wire piece 300 can be constrained by the guide hole 310 and guide pin 320 mentioned above, or by other structures. For example, in one embodiment, the second tool holder 200 has a mounting hole 221, and the loose wire piece 300 has a guide rod 330 that movably passes through the mounting hole 221. Further, the elastic element 400 is a helical spring and is sleeved on the guide rod 330. In the extending direction of the guide rod 330, the elastic force of the elastic element 400 drives the loose wire piece 300 away from the second tool holder 200.

[0055] Referring to the embodiment shown in the accompanying drawings, the second tool holder 200 has a support 220, and the elastic element 400 is a compression spring that presses against the support 220 and the loosening strip 300. The support 220 has the aforementioned mounting hole 221. Furthermore, the edge of the loosening strip 300 has a limiting step 340, which directly abuts against the first tool holder 100 and / or the fixed tool 110 at the end of the hooking stroke. (See attached drawings for details.) Figure 5It can be seen that during the hooking stroke, when the loosening plate 300 moves to its maximum position relative to the second tool holder 200, the support 220 and the fixed tool 110 directly press against the loosening plate 300 from both sides. In terms of fit details, the stroke D1 of the loosening plate 300 relative to the second tool holder 200 and the distance D2 between the two hook teeth of the hooking groove 211 are matched, for example, as shown in the attached... Figure 4 As shown in the image.

[0056] The following describes the specific working process of the cutter head structure using specific components as examples:

[0057] The cutter head structure includes a base plate 600 and a first tool holder 100 fixedly connected to the base plate 600. A second tool holder 200 is movably mounted on the base plate 600 via a constraint swing rod 620. The cutter head structure is also provided with a drive swing rod 610 that drives the second tool holder 200 to move relative to the first tool holder 100.

[0058] The drive lever 610 pushes the second tool post 200 into the hooking stroke, and the slack bar 300 mounted on the second tool post 200 moves forward together (e.g., attached). Figure 4 (Moves to the left of the center).

[0059] When the wire loosening plate 300 moves to press against the fixed blade 110, the wire loosening plate 300 stops moving relative to the base plate 600, that is, the wire loosening plate 300 stops moving relative to the fixed blade 110; at this time, the coordination relationship of each component is shown in the appendix. Figure 4 As shown; the loosening piece 300 releases the movement stroke of the guide pin 320 through the guide hole 310, and the second cutter 200 continues to move forward until the hooking stroke ends, and the sewing thread 500 falls into the hooking groove 211; at the end of the hooking stroke, the cooperation relationship of each component is shown in the appendix. Figure 5 As shown.

[0060] The drive lever 610 pushes the second cutter 200 into the thread-cutting stroke. The second cutter 200 moves backward, and the elastic element 400 on the loosening piece 300 keeps the loosening piece 300 in the position of pressing against the fixed cutter 110. That is, the loosening piece 300 remains stationary relative to the base plate 600, thereby ensuring that the thread 500 always remains taut and preventing the bottom thread from coming out of the hook groove 211 on the moving cutter 210.

[0061] When the elastic element 400 on the loosening piece 300 resets, the mating relationship of each component is shown in the appendix. Figure 4 As shown; the loosening piece 300 moves backward with the second cutter 200. At this time, the sewing thread 500 begins to loosen and is constrained by the hook groove 211 of the moving cutter 210, thus ensuring that the sewing thread 500 will not come out. The moving cutter 210 continues to move backward until it engages with the fixed cutter 110, and the sewing thread 500 is stably cut.

[0062] Based on the above description, this application also discloses a sewing device, including the cutter head structure for preventing bobbin thread from slipping out as described in this application. The cutter head structure can be found in the description above; other structures of the sewing device can be implemented in conjunction with existing technology, and will not be elaborated upon here.

[0063] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0064] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A cutter head structure to prevent the bottom line from detaching, characterized in that, include: The first tool holder has a fixed tool; The second blade holder moves in coordination with the first blade holder. The second blade holder has a hooking stroke and a cutting stroke in the direction of relative movement with the first blade holder. The second blade holder has a fixed moving blade, which works in coordination with the fixed blade and cuts the thread during the cutting stroke. A loosening piece is slidably mounted on the second knife holder, and the sewing thread is movably passed through the loosening piece; An elastic element acts between the first blade holder and the loosening strip. During the hooking stroke, the loosening strip is blocked by the first blade holder and energy is stored in the elastic element. The loosening strip moves backward relative to the second blade holder. During the cutting stroke, the elastic element returns to its original position, and the loosening strip moves forward relative to the second blade holder to delay the loosening of the wire.

2. The cutter head structure for preventing the bottom line from detaching according to claim 1, characterized in that, The second tool holder and the loosening blade are provided with a mutually cooperating guide structure.

3. The cutter head structure for preventing the bottom line from detaching according to claim 2, characterized in that, The loosening blade slides relative to the second tool holder in a first direction, and the second tool holder slides relative to the first tool holder in a second direction, the first direction being parallel to the second direction.

4. The cutter head structure for preventing the bottom line from detaching according to claim 2, characterized in that, The guiding structure includes: A guide hole, which is strip-shaped and extends along a first direction, is provided in one of the loosened wire plate and the second tool holder; A guide pin is inserted through the guide hole and is fixed to the other of the loose wire piece and the second tool holder.

5. The cutter head structure for preventing the bottom line from detaching according to claim 4, characterized in that, The guide holes are at least two arranged side by side, and the guide pins are configured accordingly.

6. The cutter head structure for preventing the bottom line from detaching according to claim 1, characterized in that, The second tool holder has a support, and the elastic element is a compression spring that presses against the support and the loose wire plate.

7. The cutter head structure for preventing bottom line detachment according to claim 6, characterized in that, The support has a mounting hole, and the loose wire has a guide rod that moves through the mounting hole.

8. The cutter head structure for preventing bottom line detachment according to claim 7, characterized in that, The elastic element is a helical spring and is sleeved on the guide rod.

9. The cutter head structure for preventing the bottom line from detaching according to claim 1, characterized in that, The edge of the loosening plate has a limiting step, and at the end of the hooking stroke, the limiting step directly abuts against the first tool holder and / or the fixed tool.

10. A sewing device, comprising a cutter head structure for preventing thread slippage as described in any one of claims 1 to 9.

Images