Trimming cutter head device of flat seaming machine and flat seaming machine

Abstract

The utility model relates to a thread trimming cutter head device of a flat seaming machine and the flat seaming machine, the thread trimming cutter head device comprises a bottom plate and a cutter rest, the cutter rest comprises a movable cutter rest provided with a movable cutter and a fixed cutter rest provided with a fixed cutter, the movable cutter rest and the fixed cutter rest are in sliding fit, and the sliding directions of the movable cutter rest comprise the first direction and the second direction opposite to each other relative to the fixed cutter rest. The thread trimming cutter head device further comprises a swing arm hinged to the bottom plate, one end of the swing arm is used for being connected with a power source, and the other end of the swing arm is in transmission connection with the movable cutter frame. The angle connecting rod assembly is connected between the bottom plate and the fixed knife rest and used for restraining movement of the knife rest; the transmission connecting rod assembly is connected between the swing arm and the angle connecting rod assembly and used for driving the cutter rest to swing back before thread trimming in the process that the movable cutter moves in the second direction. According to the technical scheme, full-stitch-length thread trimming can be achieved, and the thread hooking and trimming stability and adaptability of the thread trimming cutter head and the production efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewing equipment, in particular to a thread cutting cutter head device of a flat lock machine and the flat lock machine. BACKGROUND

[0002] A sewing machine is a machine that uses one or more threads to make one or more stitches on a fabric to interlock or join two or more pieces of fabric together. In particular, large sewing machines used in factories are more widely used in production enterprises that manufacture clothes in batches.

[0003] At present, most industrial sewing machines are equipped with automatic thread cutting devices to achieve the purpose of saving labor, electricity and manpower. The automatic thread cutting device of the sewing machine usually includes a movable cutter and a fixed cutter that cooperates with each other. The movable cutter is provided with a thread hooking groove. During the thread cutting process, the movable cutter moves to the vicinity of the sewing thread, and the thread is hooked back to the fixed cutter through the thread hooking groove to realize thread cutting.

[0004] In the prior art, in order to more conveniently control the movement of the movable cutter, the movement process of the movable cutter is the same during the process of the cutter coming out and the cutter returning. In order to realize stable thread cutting, it is necessary to adjust the position of the cutter head according to different stitch lengths, which is relatively cumbersome to operate and has poor adaptability. For example, when the thread cutting action is performed under complex working conditions such as thin-thick joint, before the stem, after the stem, etc., unexpected situations such as the movable cutter not being able to pass through the thread loop and the thread loop being pulled out of the thread hooking groove during the cutter returning may occur, which negatively affects the production efficiency and safety, and there is room for improvement. CONTENT OF THE INVENTION

[0005] The present application provides a thread cutting cutter head device of a flat lock machine, which changes the movement control of the cutter holder, effectively improves the adaptability to different working conditions, and improves the stability of the thread hooking action.

[0006] In an embodiment of the present application, a thread cutting cutter head device of a flat lock machine is disclosed, which comprises a base plate and a cutter holder, the cutter holder comprises a movable cutter holder provided with a movable cutter and a fixed cutter holder provided with a fixed cutter, the movable cutter holder and the fixed cutter holder are slidingly matched, the sliding direction of the movable cutter holder and the fixed cutter holder comprises opposite first and second directions, wherein thread cutting is implemented during movement in the second direction, and the thread cutting cutter head device further comprises:

[0007] An oscillating arm is hinged to the base plate, one end of the oscillating arm is used to connect a power source, and the other end is in transmission connection with the movable cutter holder;

[0008] An angle linkage assembly is connected between the base plate and the fixed cutter holder, and is used to constrain the movement of the cutter holder;

[0009] A transmission linkage assembly is connected between the swing arm and the angle linkage assembly for driving the knife holder to swing back once in front of the cutting line during movement of the moving knife in the second direction.

[0010] The following also provides several optional modes, but not as an additional limitation to the above general scheme, just a further supplement or preferred, without technical or logical contradiction, each optional mode can be combined alone for the above general scheme, but also can be combined between multiple optional modes.

[0011] In one embodiment, the moving knife holder is provided with a linkage groove, the extension direction of the linkage groove is perpendicular to the first direction, and the end of the swing arm is movably arranged in the linkage groove;

[0012] The moving knife holder is also provided with a sliding groove, the angle linkage assembly includes a first angle linkage and a second angle linkage, and each angle linkage is respectively hinged between the bottom plate and the fixed knife holder, wherein the hinged part with the fixed knife holder is in the sliding groove to constrain the movement of the knife holder;

[0013] One of the angle linkages has an extension part beyond the hinged part with the fixed knife holder, and is connected with the transmission linkage assembly through the extension part.

[0014] In one embodiment, the moving knife holder has opposite head and tail sides, and the moving knife is located at the head side of the moving knife holder; the sliding groove includes:

[0015] A first sliding groove is located at the head side of the linkage groove, and the hinged part of the first angle linkage with the fixed knife holder is located in the first sliding groove;

[0016] A second sliding groove is located at the tail side of the linkage groove, and the hinged part of the second angle linkage with the fixed knife holder is located in the second sliding groove;

[0017] The second angle linkage is connected with the transmission linkage assembly.

[0018] In one embodiment, the transmission linkage assembly includes:

[0019] A first transmission linkage is in sliding fit with the second angle linkage;

[0020] A second transmission linkage is hinged between the first transmission linkage and the swing arm.

[0021] In one embodiment, the second angle linkage is provided with a third sliding groove, and at least a part of the first transmission linkage is arranged in the third sliding groove, which limits the rotation of the first transmission linkage relative to the second angle linkage while in sliding fit.

[0022] In one of the embodiments, the first transmission link is provided with a fourth sliding slot, and the second angle link is provided with a limiting shaft located in the third sliding slot, and the limiting shaft passes through the fourth sliding slot to keep at least a part of the first transmission link in the third sliding slot.

[0023] In one of the embodiments, one end of the swing arm is a linkage end inserted into the linkage slot, and the swing arm is hinged to the first axis with the bottom plate;

[0024] The hinged part of the second transmission link and the swing arm is between the linkage end and the first axis.

[0025] In one of the embodiments, the thread cutting knife disc device further comprises:

[0026] The elastic member acts between the bottom plate and the fixed knife holder to drive the fixed knife holder to cut;

[0027] The limiting member is fixed to the bottom plate to limit the extreme position of the fixed knife holder.

[0028] In one of the embodiments, the moving knife holder has opposite head side and tail side, and the moving knife is located at the head side of the moving knife holder;

[0029] The moving knife has a hook opening for hooking the thread, and the head side of the moving knife holder swings towards the opening direction of the hook opening relative to the tail side in one swing process of the knife holder;

[0030] The knife holder further swings twice after cutting the thread.

[0031] In one of the embodiments of the application, a thread cutting machine is also disclosed, which comprises the thread cutting knife disc device of the thread cutting machine according to any of the technical solutions.

[0032] In the technical solutions disclosed in the application, the movement control of the knife holder is realized through the constraint of the swing arm, the angle link assembly and the transmission link assembly. The knife holder can swing relative to the bottom plate in the return process, so that the thread cutting range of the thread cutting knife disc device covers the whole stitch range, the stability of the thread cutting and hooking of the thread cutting knife disc and the adaptability to different sewing conditions are improved, the number of thread cutting knife disc adjustments is reduced, and the production efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0034] Figure 1 Figure 1 is a schematic view of a thread cutting device of a flat seaming machine according to an embodiment of the present application;

[0035] Figure 2 Figure 2 is a schematic view of a thread cutting action of the thread cutting device of the flat seaming machine according to an embodiment of the present application;

[0036] Figure 3 Figure 3 is a schematic view of a thread cutting action of the thread cutting device of the flat seaming machine according to an embodiment of the present application;

[0037] Figure 4 Figure 4 is a schematic view of a thread cutting action of the thread cutting device of the flat seaming machine according to an embodiment of the present application;

[0038] Figure 5 Figure 5 is a schematic view of a thread cutting action of the thread cutting device of the flat seaming machine according to an embodiment of the present application;

[0039] Figure 6 Figure 6 is a schematic view of a thread cutting action of the thread cutting device of the flat seaming machine according to an embodiment of the present application;

[0040] Figure 7 Figure 7 is an exploded view of the thread cutting device of the flat seaming machine according to an embodiment of the present application.

[0041] The reference signs of the components are as follows:

[0042] 1, base plate; 2, fixed knife holder limiting plate; 3, movable knife holder limiting plate; 4, screw; 5, cushion block; 6, cushion block; 7, pressing plate; 8, fixed knife holder; 9, screw; 10, screw; 11, fixed knife fixing block; 12, movable knife; 121, hook opening; 13, fixed knife; 14, screw; 15, screw; 16, swing arm; 17, shaft position screw; 18, rotating sleeve; 19, screw; 20, shaft position screw; 21, first transmission connecting rod; 211, fourth sliding groove; 22, second angle connecting rod; 221, extension; 222, third sliding groove; 23, fixing sleeve; 24, second transmission connecting rod; 25, first angle connecting rod; 26, movable knife holder; 261, linkage groove; 262, first sliding groove; 263, second sliding groove; 27, screw; 28, screw; 29, spring. DETAILED DESCRIPTION

[0043] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0044] It is to be noted that when a component is referred to as being "on" or "disposed on" another component, it can be directly on the other component or intervening components can also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used in the description of the present application are for the purpose of illustration only and do not indicate the only position of the embodiment.

[0045] In addition, the terms "first", "second", etc. are used herein only to describe various conditions, and are not to be construed as indicating relative importance or a number of indicated technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0046] In the present application, unless otherwise explicitly specified and limited, the "on", "under", "above" and "over" of the first feature to the second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "on", "above" and "over" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height (or in a use state, or in a certain drawing perspective). The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height (or in a use state, or in a certain drawing perspective).

[0047] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the associated listed items.

[0048] In the prior art, the range of the thread cutting knife disc cannot cover the entire range of needle spacing. For example, the current common range of needle spacing adjustment is 2 to 4.5, and the thread cutting knife disc can only adapt to part of the range of needle spacing. When the thread is cut in the overlock, the thread cutting knife disc may not be able to reach the thread, or when the thread is cut in the large needle spacing, the problem of thread loop falling out is prone to occur.

[0049] In order to improve the adaptability and stability of the thread cutting knife disc, with reference to the accompanying drawings Figure 1 to the accompanying drawings Figure 7As shown, one embodiment of this application discloses a thread-cutting disc device for a coverstitch sewing machine, including a base plate 1 and a blade holder. The blade holder includes a movable blade holder 26 with a movable blade 12 and a fixed blade holder 8 with a fixed blade 13. The movable blade holder 26 and the fixed blade holder 8 are slidably engaged. The sliding directions of the movable blade holder 26 relative to the fixed blade holder 8 include a first direction and a second direction that are opposite to each other. The movable blade holder 26 and the movable blade 12 achieve blade extension through movement in the first direction and achieve engagement with the fixed blade 13 through movement in the second direction, that is, thread cutting is performed during movement along the second direction.

[0050] The relative movement of the cutter head is constrained by the base plate 1 and the transmission components disposed between the base plate 1, the cutter head, and the power source. Therefore, the wire cutting disc device also includes:

[0051] The swing arm 16 is hinged to the base plate 1. One end of the swing arm 16 is used to connect to the power source, and the other end is connected to the moving tool holder 26 for transmission.

[0052] An angle linkage assembly is connected between the base plate 1 and the fixed tool holder 8 to constrain the movement of the tool holder;

[0053] The transmission linkage assembly, connected between the swing arm 16 and the angle linkage assembly, is used to drive the blade holder to swing back once before cutting the wire during the movement of the moving blade 12 in the second direction (as shown in the attached diagram). Figure 4 (As shown).

[0054] The key point of this embodiment is that when the moving blade 12 returns to its original position, the transmission linkage assembly can drive the blade holder to swing before cutting the wire, following the return motion. Further, in conjunction with the attached... Figure 1 To be continued Figure 6 As shown in the motion diagram, the head of the moving blade 12 can achieve a V-shaped return trajectory. This configuration allows the thread cutting disc device to cut thread across the entire needle pitch range, achieving full-pitch thread cutting. While ensuring adaptability and stability, it also reduces the frequency of disc adjustments, thereby improving production efficiency.

[0055] Reference Appendix Figure 1 and appendix Figure 7 In the illustrated embodiment, the movable blade holder 26 is provided with a linkage groove 261, the extension direction of which is perpendicular to the first direction. The end of the swing arm 16 is movably inserted into the linkage groove 261, and the swing arm 16 achieves overall drive of the blade holder through the linkage groove 261. The movable blade holder 26 has opposing head and tail sides, with the movable blade 12 located on the head side of the movable blade holder 26. The movable blade 12 has a hook 121 for hooking the sewing thread. During one swing, the head side of the movable blade holder 26 swings relative to the tail side toward the opening direction of the hook 121. Based on existing technology, it can be understood that the blade holder also performs a second swing after thread cutting (as shown in the attached diagram). Figure 6 (As shown).

[0056] The movable cutter holder 26 is also provided with a slide groove, and the angle linkage assembly includes a first angle linkage 25 and a second angle linkage 22, each of which is hingedly connected between the base plate 1 and the fixed cutter holder 8, and the hinged connection position of each angle linkage with the fixed cutter holder 8 is located in the slide groove to restrict the movement of the cutter holder. The movable cutter holder 26 can move relative to the fixed cutter holder 8 under the action of the swing arm 16 to realize the movement in the first direction and the second direction by releasing the movement of the angle linkage assembly through the slide groove. One of the angle linkages has an extension 221 beyond the hinged connection position with the fixed cutter holder 8, and the extension 221 is connected with the transmission linkage assembly. The extension 221 can be provided on the first angle linkage 25 and / or the second angle linkage 22.

[0057] Further, the movable cutter holder 26 has opposite head and tail sides, and the movable cutter 12 is located on the head side of the movable cutter holder 26. The slide groove includes:

[0058] a first slide groove 262 located on the head side of the linkage groove 261, and the hinged connection position of the first angle linkage 25 with the fixed cutter holder 8 is located in the first slide groove 262;

[0059] a second slide groove 263 located on the tail side of the linkage groove 261, and the hinged connection position of the second angle linkage 22 with the fixed cutter holder 8 is located in the second slide groove 263;

[0060] The second angle linkage 22 is connected with the transmission linkage assembly, and therefore the extension 221 is also provided on the second angle linkage 22. The hinged connection positions of the base plate 1 and the second angle linkage 22 and the extension 221 are respectively located on both sides of the hinged connection position of the second angle linkage 22 and the fixed cutter holder 8, and the extension 221 is located on the same side of the cutter holder as the swing arm 16 to facilitate the arrangement of the transmission linkage assembly.

[0061] The arrangement details of the transmission linkage assembly can be referred to the embodiments shown in the accompanying drawings Figure 1 and the accompanying drawings Figure 7 In the embodiments shown in the accompanying drawings, the transmission linkage assembly includes:

[0062] a first transmission linkage 21 in sliding cooperation with the second angle linkage 22;

[0063] a second transmission linkage 24 hingedly connected between the first transmission linkage 21 and the swing arm 16.

[0064] Further, the second angle connecting rod 22 is provided with a third sliding groove 222, and at least a part of the first transmission connecting rod 21 is arranged in the third sliding groove 222, so as to limit the rotation of the first transmission connecting rod 21 relative to the second angle connecting rod 22 while slidingly fitting. The third sliding groove 222 can limit the relative angle of the second angle connecting rod 22 and the first transmission connecting rod 21 while releasing the relative movement of the second angle connecting rod 22 and the first transmission connecting rod 21. In this arrangement, the movable cutter holder 26 can move relative to the fixed cutter holder 8 under the driving of the swing arm 16, and the swing arm 16 can also actively control the swinging of the cutter holder relative to the base plate 1. For the fitting details, please refer to the embodiments shown in the accompanying drawings Figure 7 In the embodiments shown in the accompanying drawings, the first transmission connecting rod 21 is provided with a fourth sliding groove 211, and the second angle connecting rod 22 is provided with a limiting shaft arranged in the third sliding groove 222, and the limiting shaft passes through the fourth sliding groove 211 to keep at least a part of the first transmission connecting rod 21 in the third sliding groove 222. The limiting shaft can be provided by the shaft position screw shown in the accompanying drawings Figure 7 .

[0065] In addition to the driving effect of the swing arm 16, the cutter holder can also be driven by the spring 29 shown in the embodiments shown in the accompanying drawings, which is arranged between the base plate 1 and the fixed cutter holder 8 to drive the fixed cutter holder 8 to move out of the cutter. The spring 29 is installed on the base plate 1 by the screw 28 close to the fixed cutter holder limiting plate 2.

[0066] The spring 29 is installed on the base plate 1 by the screw 28 close to the fixed cutter holder limiting plate 2. Figure 7

[0067] The limiting member (for example, the fixed cutter holder limiting plate 2 in the drawings) is fixed to the base plate 1 by a screw to limit the limit position of the fixed cutter holder 8 moving out of the cutter.

[0068] The cutter holder limiting plate 3 is arranged close to the fixed cutter holder limiting plate 2 and is fixed to the base plate 1 by the screw 4, and the cutter holder limiting plate 3 is used to limit the limit position of the cutter holder movement, such as the limit position of the cutter holder swinging or the limit position of the cutter holder returning.

[0069] For the assembly details of the above-mentioned components, please refer to the embodiments shown in the accompanying drawings Figure 7 ​In this embodiment, the moving blade 12 is mounted on the moving blade holder 26, and the fixed blade 13 is mounted on the fixed blade fixing block 11 by screws 14 and 15. The fixed blade fixing block 11 is mounted on the fixed blade holder 8, which is also equipped with a pressure plate 7, a pad 5 mounted by screws 10, and a pad 6 mounted by screws 9. The moving blade holder 26 and the fixed blade holder 8 are close to each other and slide together, and are movably constrained to the base plate 1 by a first angle connecting rod 25 and a second angle connecting rod 22. One end of the first angle connecting rod 25 is hinged to the fixed blade holder 8 and the hinge shaft is movably engaged with the first sliding groove 262. The other end is hinged to the base plate 1 by a rotating sleeve 18 and a screw 19. The rotating sleeve 18 can be set as an eccentric wheel, and the geometric relationship between the first angle connecting rod 25 and other components can be finely adjusted by adjusting the eccentric position, thereby adjusting the movement trajectory of the wire cutting disc. The first angle connecting rod 25 can also be directly hinged to the base plate 1 by an eccentric screw. The middle part of the second angle link 22 is hinged to the fixed tool holder 8 via a fixed sleeve 23 and a screw 27. The fixed sleeve 23 is movably fitted into the second slide groove 263. One end of the second angle link 22 is provided with an extension 221 and a third slide groove 222, and the other end is hinged to the base plate 1 via an eccentric wheel and a screw. To constrain the motion freedom of the moving tool holder 26, the first angle link 25 and the fixed tool holder 8 clamp the moving tool holder 26. Furthermore, the second angle link 22 and the fixed tool holder 8 clamp the moving tool holder 26. Under the constraints of the first angle link 25 and the second angle link 22, the tool holder as a whole can swing relative to the base plate 1, and the moving tool holder 26 and the fixed tool holder 8 can slide relative to each other.

[0070] The swing arm 16 is mounted on the base plate 1 via a pivot screw 17. One end of the swing arm 16 is the linkage end that fits into the linkage slot 261. The swing arm is hinged to the base plate along the first axis (provided by the pivot screw 17). The hinge point between the second transmission link 24 and the swing arm 16 is located between the linkage end and the first axis. One end of the second transmission link 24 is hinged to the swing arm 16 via a pivot screw 20, and the other end is hinged to the first transmission link 21. The swing arm 16 drives the tool feed and return through the linkage end, and achieves one swing of the tool holder through the second transmission link 24.

[0071] The following is in conjunction with the appendix Figure 1 To be continued Figure 6 An exemplary description of the operation of the wire cutting disc device in one embodiment:

[0072] Reference Appendix Figure 1 To be continued Figure 2 The swing arm 16 is driven by the power source to swing relative to the first axis and drives the tool holder toward the axis via the linkage groove 261. Figure 2 The upper middle swing is a reset swing, used to reset the displacement of the first and second swings mentioned below;

[0073] Reference Appendix Figure 2 To be continuedFigure 3 When the swing arm 16 is further swung by the power source and drives the movable cutter holder 26 and the fixed cutter holder 8 to move towards the first direction, the fixed cutter holder 8 swings first under the action of the spring 29 until it contacts the fixed cutter holder limiting plate 2, and then stops moving after being stopped by the fixed cutter holder limiting plate 2, and the movable cutter holder 26 continues to move towards the first direction until it is stopped by the fixed sleeve 23, at which time the cutting action is completed;

[0074] Reference is made to the accompanying drawings Figure 3 to the accompanying drawings Figure 4 When the swing arm 16 is reversely swung by the power source and drives the fixed cutter holder 8 and the movable cutter holder 26 to move towards the second direction, the first transmission connecting rod 21 is pressed down by the second transmission connecting rod 24 arranged on the swing arm 16, and the second angle connecting rod 22 is rotated to drive the fixed cutter holder 8 and the movable cutter holder 26 to swing once, and the fixed cutter holder 8 stops moving when the elastic force of the spring 29 is equal to the pressing force of the second transmission connecting rod 24, and the swinging once is completed, and in this process, the hook 121 can better cooperate with the thread, wherein the angle of the swinging once can be controlled by the spring 29, or a limiting pin can be arranged on the bottom plate 1 to control the swinging angle.

[0075] Reference is made to the accompanying drawings Figure 4 to the accompanying drawings Figure 5 When the swing arm 16 is further reversely swung by the power source and drives the movable cutter holder 26 to continue to move towards the second direction, until the thread in the hook 121 is cut by the movable cutter 12 and the fixed cutter 13 which cooperate with each other, wherein the needle thread is cut, the bottom thread is cut and clamped by the thread clamp;

[0076] Reference is made to the accompanying drawings Figure 5 to the accompanying drawings Figure 6 When the swing arm 16 is further reversely swung by the power source, at this time the movable cutter holder 26 is abutted on the fixed sleeve 23 towards the second direction, the swing arm 16 drives the movable cutter holder 26 and the fixed cutter holder 8 to swing twice and restores to the state shown in the accompanying drawings Figure 1 .

[0077] The above process is repeated.

[0078] In combination with the above, an embodiment of the present application further discloses a binding machine, which comprises the thread cutting cutter disc device of the binding machine in the technical solutions of the present application. The specific arrangement and working process of the thread cutting cutter disc device of the binding machine are described above, and other arrangements of the binding machine are implemented in combination with the prior art, which will not be described here.

[0079] Any technical features in the above-described embodiments can be combined in any manner, and for the sake of brevity, the foregoing description has not described all possible combinations of the technical features in the above-described embodiments. However, it is understood that no reference to a particular feature in a given embodiment is intended to imply that all embodiments must include that particular feature. Moreover, descriptions of a particular feature in a given embodiment does not mean that the feature is essential or critical to that embodiment. Any technical features in the different embodiments can be combined in the same drawing figure, and it can be considered that the same drawing figure discloses the combination of the embodiments involved.

[0080] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A thread-cutting disc device for a coverstitch sewing machine, comprising a base plate and a blade holder, the blade holder including a movable blade holder with a movable blade and a fixed blade holder with a fixed blade, the movable blade holder and the fixed blade holder being slidably engaged, the sliding directions of the movable blade holder relative to the fixed blade holder including a first direction and a second direction opposite to each other, wherein thread cutting is performed during movement along the second direction, characterized in that, The wire cutting disc device further includes: A swing arm is hinged to the base plate. One end of the swing arm is used to connect to a power source, and the other end is connected to the moving tool holder for transmission. An angle linkage assembly is connected between the base plate and the fixed tool holder to constrain the movement of the tool holder; A transmission linkage assembly, connected between the swing arm and the angle linkage assembly, is used to drive the blade holder to swing back once before cutting the wire during the movement of the moving blade in the second direction.

2. The thread-cutting disc device of the overlock sewing machine according to claim 1, characterized in that, The moving tool holder is provided with a linkage groove, the extension direction of the linkage groove is perpendicular to the first direction, and the end of the swing arm is movably inserted into the linkage groove; The moving tool holder is also provided with a sliding groove. The angle linkage assembly includes a first angle linkage and a second angle linkage. Each angle linkage is respectively hinged between the base plate and the fixed tool holder. The hinge part with the fixed tool holder is located in the sliding groove to constrain the movement of the tool holder. One of the angle links has an extension that extends beyond the hinged portion with the fixed tool holder and is connected to the transmission link assembly via the extension.

3. The thread-cutting disc device of the overlock sewing machine according to claim 2, characterized in that, The moving tool holder has opposing head and tail sides, wherein the moving tool is located on the head side of the moving tool holder; the slide includes: The first slide groove is located on the head side of the linkage groove, and the hinge part of the first angle connecting rod and the fixed tool holder is located in the first slide groove; The second slide groove is located at the tail side of the linkage groove, and the hinge part of the second angle connecting rod and the fixed tool holder is located in the second slide groove; The second angle connecting rod is connected to the transmission connecting rod assembly.

4. The thread-cutting disc device of the overlock sewing machine according to claim 2, characterized in that, The transmission linkage assembly includes: The first transmission link slides in conjunction with the second angle link. The second transmission link is hinged between the first transmission link and the swing arm.

5. The thread-cutting disc device of the overlock sewing machine according to claim 4, characterized in that, The second angle connecting rod has a third sliding groove, and at least a portion of the first transmission connecting rod is inserted into the third sliding groove, which restricts the rotation of the first transmission connecting rod relative to the second angle connecting rod while sliding.

6. The thread-cutting disc device of the overlock sewing machine according to claim 5, characterized in that, The first transmission link has a fourth slide groove, and the second angle link has a limiting shaft located in the third slide groove. The limiting shaft passes through the fourth slide groove and holds at least a portion of the first transmission link in the third slide groove.

7. The thread-cutting disc device of the overlock sewing machine according to claim 4, characterized in that, One end of the swing arm is a linkage end that is inserted into the linkage groove, and the swing arm is hinged to the base plate on the first axis. The hinge joint between the second transmission link and the swing arm is located between the linkage end and the first axis.

8. The thread-cutting disc device of the overlock sewing machine according to claim 1, characterized in that, The wire cutting disc device further includes: An elastic element acts between the base plate and the fixed tool holder, driving the fixed tool holder to extend the tool; A limiting component is fixed to the base plate to limit the extreme position of the fixed tool holder's blade extension.

9. The thread-cutting disc device of the overlock sewing machine according to claim 1, characterized in that, The moving tool holder has opposing head and tail sides, wherein the moving tool is located on the head side of the moving tool holder; The movable knife has a hook for hooking the sewing thread, and during one swing, the head side of the movable knife holder swings relative to the tail side toward the opening of the hook. The blade holder also swings back a second time after cutting the wire.

10. A cover-stitching machine, characterized in that, The suture cutter disc device of the cover-stitch machine according to any one of claims 1 to 9.

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