Thread locking mechanism and sewing equipment equipped with the same

Abstract

The present application relates to a thread locking mechanism and a sewing device provided with the thread locking mechanism, wherein the thread locking mechanism includes a crank, a thread locking assembly, a stitch length adjustment assembly and a driving source, the thread locking assembly includes a hook knife, the hook knife is connected to the crank through a first transmission assembly, and the rotation of the crank can drive the hook knife to move; the stitch length adjustment assembly includes an adjustment shaft for adjusting the stitch length, the adjustment shaft is connected to the crank through a second transmission assembly, and the rotation of the crank can drive the adjustment shaft to move; the output end of the driving source is connected to the crank to drive the crank to rotate. In the above scheme, by connecting the thread locking assembly and the stitch length adjustment assembly to the crank together, and connecting the crank to the driving source, when the driving source drives the crank to rotate, the thread locking mechanism can simultaneously realize the thread locking and stitch length adjustment functions. Compared with the prior art in which thread locking and stitch length adjustment are realized by three driving sources, the space occupied by the overall structure is reduced, the failure rate caused by the driving source is reduced, and the production cost is also reduced.

Description

Technical Field

[0001] The present application relates to the technical field of sewing equipment, and in particular to a thread locking mechanism and a sewing equipment provided with the thread locking mechanism. Background Art

[0002] At present, in order to prevent the problem of thread ends falling off and loosening at the end of sewing on the interlock sewing machine, a special thread locking structure is designed, which can effectively prevent the stitches from loosening after locking the thread. The current thread locking mechanism includes three driving sources (motor or cylinder). The whole thread locking process is as follows: after stopping sewing, the first driving source drives the thread hooking knife clockwise to hook the thread, and at the same time the third driving source acts to reduce the stitch length, and then the hook knife starts the first reset stroke. At the same time, the second driving source rotates clockwise, and the crank clamps the rocker bar in the process of returning the knife and holds it. At this time, the first reset of the hook knife is completed, the main shaft rotates to feed a needle, and the second driving source resets and releases the rocker bar, and the rocker bar drives the hook knife to complete the second reset stroke.

[0003] The existing thread locking mechanism has the following problems: the three drive sources are large in size, the installation position is difficult to design, and after the three drive sources are installed, there is a problem that other additional devices cannot be installed; the needle positions of different needle position groups are different, and in order to achieve a better thread locking effect, the hook knife position also needs to be slightly adjusted. The existing thread locking mechanism requires loosening the screws to adjust the hook knife position, but in fact, due to blocked vision and small operating space, adjustment is difficult, time-consuming and labor-intensive. Summary of the Invention

[0004] Based on this, it is necessary to provide a thread locking mechanism and a sewing device provided with the thread locking mechanism, aiming to solve the problem of complex structure of the thread locking mechanism in the prior art.

[0005] In a first aspect, the present application provides a thread-locking mechanism comprising a crank, a thread-locking assembly, a stitch-length adjustment assembly, and a drive source. The thread-locking assembly comprises a hook knife connected to the crank via a first transmission assembly, wherein rotation of the crank drives the hook knife; the stitch-length adjustment assembly comprises an adjustment shaft for adjusting stitch length, wherein the adjustment shaft is connected to the crank via a second transmission assembly, wherein rotation of the crank drives the adjustment shaft; and the output end of the drive source is connected to the crank to drive the crank to rotate.

[0006] In the above scheme, the thread locking assembly and the needle length adjustment assembly are connected to the crank together, and the crank is connected to the driving source, so that when the driving source drives the crank to rotate, the thread locking mechanism can simultaneously realize the thread locking and needle length adjustment functions. Compared with the existing technology of realizing thread locking and needle length adjustment through three driving sources, the structure is simplified, the space occupied by the overall structure is reduced, the failure rate caused by the driving source is reduced, and the production cost is reduced.

[0007] The technical solution of this application is further described below:

[0008] In any embodiment, the driving source is connected to a mounting plate, and the mounting plate and the crank are slidably connected via a slider.

[0009] In any embodiment, the mounting plate and the crank are respectively provided with a first slide groove and a second slide groove, one end of the slider is slidingly connected to the first slide groove, and the other end is slidingly connected to the second slide groove, wherein the first slide groove is arranged tangentially along the rotation circumference of the crank, and the second slide groove is arranged radially along the rotation circumference of the crank.

[0010] In any embodiment, the thread locking mechanism further includes a body, and the mounting plate is fixed to the body.

[0011] In any embodiment, the first transmission assembly includes a first connecting rod and a first swing rod, one end of the first connecting rod is rotatably connected to the crank, and the other end is rotatably connected to the head end of the first swing rod, the tail end of the first swing rod is connected to the hook knife, and the middle end of the first swing rod is rotatably connected to the machine body, and the middle end is located between the head end and the tail end.

[0012] In any embodiment, the second transmission assembly includes a swing crank, a second swing rod, a second connecting rod and a connecting rod, and the swing crank, the second swing rod, the second connecting rod and the connecting rod are connected end to end in sequence and are all rotatably connected. The end of the swing crank away from the second swing rod is connected to the crank, and the end of the connecting rod away from the second connecting rod is rotatably connected to the adjusting shaft, and the counterclockwise rotation of the connecting rod can drive the adjusting shaft to rotate in the same direction. The middle end of the second swing rod is also rotatably connected to the body, and the middle end is located between the second swing rod connected to the swing crank and the second swing rod connected to the second connecting rod.

[0013] In any embodiment, the adjusting shaft includes a first rotating part and a second rotating part, the first rotating part is rotatably connected to the connecting rod through a connecting member, the first rotating part is provided with a limit member, the connecting rod rotates around the connecting member to abut against the limit member, and the first rotating part and the second rotating part maintain abutment in the circumferential direction so that the first rotating part and the second rotating part rotate synchronously.

[0014] In any embodiment, the limiting member is made of flexible material.

[0015] In any embodiment, the first rotating part is connected to a needle distance indicator plate, and the needle distance indicator plate is integrally formed with the first rotating part.

[0016] In a second aspect, the present application also provides a sewing device comprising the thread locking mechanism described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings that constitute a part of this application are used to provide further understanding of this application. The schematic implementation methods and descriptions of this application are used to explain this application and do not constitute improper limitations on this application.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the thread locking mechanism shown in one embodiment of the present application. Figure 1 ;

[0020] Figure 2 yes Figure 1 A top view of

[0021] Figure 3 yes Figure 2 Middle AA section;

[0022] Figure 4 This is a schematic diagram of the structure of the thread locking mechanism shown in one embodiment of the present application. Figure 2 ;

[0023] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle adjustment shaft;

[0024] Figure 6 This is a schematic diagram of the structure of the thread locking mechanism shown in one embodiment of the present application. Figure 3 .

[0025] Description of reference numerals:

[0026] 100. Thread locking mechanism; 110. Thread locking assembly; 111. Hook knife; 112. First transmission assembly; 1121. First connecting rod; 1122. First swinging rod; 120. Crank; 121. Second slide; 130. Stitch adjustment assembly; 131. Adjusting shaft; 1311. First rotating part; 1312. Second rotating part; 1313. Limiting member; 1314. Stitch indication plate; 132. Second transmission assembly; 1321. Swinging crank; 1322. Second swinging rod; 1323. Second connecting rod; 1324. Connecting rod; 133. Connecting member; 140. Driving source; 150. Mounting plate; 151. First slide; 160. Slider; 170. Machine body; 180. Scale plate. DETAILED DESCRIPTION

[0027] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0029] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0032] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0033] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0035] The preferred implementation of the present application is described below with reference to the accompanying drawings.

[0036] like Figures 1 to 3 Figure 1 shows a thread locking mechanism 100 according to one embodiment of the present application, comprising a crank 120, a thread locking assembly 110, a stitch adjustment assembly 130, and a drive source 140. The thread locking assembly 110 includes a hooking knife 111, which is connected to the crank 120 via a first transmission assembly 112. Rotation of the crank 120 drives the hooking knife 111. The stitch adjustment assembly 130 includes an adjustment shaft 131 for adjusting stitch length. The adjustment shaft 131 is connected to the crank 120 via a second transmission assembly 132. Rotation of the crank 120 drives the adjustment shaft 131. The output end of the drive source 140 is connected to the crank 120 to drive its rotation.

[0037] When the thread locking assembly 110 is used to lock the thread, the hook knife 111 forks forward to open the bottom line, the first section of the hook knife 111 resets, drives the hook knife 111 backward and hooks the left needle thread, and pulls the left needle thread out of a loop, at this time the main shaft rotates for another half stitch, the left needle thread passes through the hooked thread loop, the second section of the hook knife 111 resets, drives the hook knife 111 backward again, at this time the main shaft completes the last stitch, and the entire sewing is completed after cutting the thread, and a "Q"-shaped knot will be formed in the end.

[0038] like Figure 1 and Figure 2 As shown, when the crank 120 rotates clockwise, the crank 120 drives the hook cutter 111 forward through the first transmission assembly 112 , and when the crank 120 rotates counterclockwise, the crank 120 drives the hook cutter 111 backward through the first transmission assembly 112 .

[0039] When the adjustment shaft 131 is used to adjust the needle length, the adjustment shaft 131 is connected to the differential shaft, so that when the adjustment shaft 131 rotates, the differential shaft drives the needle length shaft rod to move and thus adjust the needle length. This part is the existing technology and will not be described in detail in this application.

[0040] like Figure 1 and Figure 3 As shown, when the crank 120 rotates clockwise, the crank 120 drives the adjusting shaft 131 to rotate counterclockwise through the second transmission assembly 132 to reduce the stitch length.

[0041] The output end of the drive source 140 is connected to the crank 120. When the drive source 140 drives the crank 120 to rotate clockwise, the crank 120 can drive the hook knife 111 forward and simultaneously drive the adjustment shaft 131 to rotate counterclockwise to reduce the stitch length. When the drive source 140 drives the crank 120 to rotate counterclockwise, the crank 120 can drive the hook knife 111 backward to achieve thread locking. The drive source 140 can be a heat engine, an electric motor, etc. In this embodiment, the drive source 140 is a stepper motor.

[0042] In the above scheme, the thread locking assembly 110 and the stitch length adjustment assembly 130 are connected to the crank 120, and the crank 120 is connected to the driving source 140, so that when the driving source 140 drives the crank 120 to rotate, the thread locking mechanism 100 can simultaneously realize the thread locking and stitch length adjustment functions. Compared with the prior art in which thread locking and stitch length adjustment are realized through three driving sources 140, the structure is simplified, the space occupied by the overall structure is reduced, the failure rate caused by the driving source 140 is reduced, and the production cost is reduced.

[0043] See also Figures 1 to 3According to some embodiments of the present application, the driving source 140 is optionally connected to a mounting plate 150, and the mounting plate 150 and the crank 120 are slidably connected via a slider 160. The mounting plate 150 limits the rotational space of the crank 120, so that the rotation of the crank 120 can drive the adjusting shaft 131 and the hook knife 111 in the desired direction.

[0044] See also Figures 1 to 3 According to some embodiments of the present application, optionally, the mounting plate 150 and the crank 120 are respectively provided with a first slide groove 151 and a second slide groove 121, one end of the slider 160 is slidingly connected to the first slide groove 151, and the other end is slidingly connected to the second slide groove 121, wherein the first slide groove 151 is arranged along the tangent direction of the rotation circle of the crank 120, and the second slide groove 121 is arranged along the radial direction of the rotation circle of the crank 120.

[0045] Since one end of the crank 120 is connected to the output shaft of the driving source 140, when the driving source 140 drives the crank 120 to rotate, the crank 120 rotates with the output shaft as the center. The first slide 151 is arranged tangentially to the rotation circumference of the crank 120. When the crank 120 rotates, one end of the slider 160 slides relative to the first slide 151, while the other end of the slider 160 also slides relative to the second slide 121 arranged radially along the rotation circumference of the crank 120, so that the crank 120 can rotate normally. Figure 2 In the embodiment shown, when the slider 160 is located in the middle position of the first slide groove 151, the slider 160 is closest to the rotation center of the crank 120. When the crank 120 rotates clockwise or counterclockwise, while the slider 160 slides in the first slide groove 151, the slider 160 moves in the second groove in a direction away from the rotation center of the crank 120, so that the crank 120 can rotate normally.

[0046] See also Figure 4 According to some embodiments of the present application, the thread locking mechanism 100 may further include a body 170, and the mounting plate 150 is fixed to the body 170. The body 170 is used to fix other components of the thread locking mechanism 100. Figure 4 In the illustrated embodiment, the body 170 is provided with an installation space for installing the driving source 140 to simplify the appearance of the sewing apparatus.

[0047] See also Figure 1 、 Figure 2 and Figure 4According to some embodiments of the present application, optionally, the first transmission assembly 112 includes a first connecting rod 1121 and a first swing rod 1122, one end of the first connecting rod 1121 is rotatably connected to the crank 120, and the other end is rotatably connected to the head end of the first swing rod 1122, the tail end of the first swing rod 1122 is connected to the hook knife 111, and the middle end of the first swing rod 1122 is rotatably connected to the body 170, and the middle end is located between the head end and the tail end.

[0048] like Figure 2 As shown, when the crank 120 rotates clockwise, it drives the head ends of the first connecting rod 1121 and the first swing rod 1122 to move toward the direction close to the mounting plate 150, so that the first swing rod 1122 rotates counterclockwise around the middle end, and then the tail end of the first swing rod 1122 rotates counterclockwise and drives the hook knife 111 forward.

[0049] Correspondingly, when the crank 120 rotates counterclockwise, it drives the head ends of the first connecting rod 1121 and the first swing rod 1122 to move in the direction away from the mounting plate 150, so that the first swing rod 1122 rotates clockwise around the middle end, and then the tail end of the first swing rod 1122 rotates clockwise and drives the hook knife 111 to retreat.

[0050] See also Figure 1 、 Figure 3 and Figure 5 According to some embodiments of the present application, optionally, the second transmission assembly 132 includes a swing crank 1321, a second swing rod 1322, a second connecting rod 1323 and a connecting rod 1324. The swing crank 1321, the second swing rod 1322, the second connecting rod 1323 and the connecting rod 1324 are connected end to end in sequence and are all rotationally connected. The end of the swing crank 1321 away from the second swing rod 1322 is connected to the crank 120, and the end of the connecting rod 1324 away from the second connecting rod 1323 is rotationally connected to the adjusting shaft 131, and the counterclockwise rotation of the connecting rod 1324 can drive the adjusting shaft 131 to rotate in the same direction. The middle end of the second swing rod 1322 is also rotationally connected to the body 170, and the middle end is located between the second swing rod 1322 connected to the swing crank 1321 and the second swing rod 1322 connected to the second connecting rod 1323.

[0051] like Figure 3As shown, when the crank 120 rotates clockwise, the slider 160 moves in the first slide groove 151 toward the direction away from the first swing rod 1122, so that the swing crank 1321 and the second swing rod 1322 close to the end of the swing crank 1321 move synchronously with the slider 160, so that the second swing rod 1322 rotates counterclockwise around the middle end, so that the end of the second swing rod 1322 close to the second connecting rod 1323 drives the second connecting rod 1323 to move toward the direction close to the adjusting shaft 131, so that the second connecting rod 1323 drives the connecting rod 1324 to rotate counterclockwise, and then drives the adjusting shaft 131 to rotate counterclockwise, completing the stitch length adjustment.

[0052] See also Figure 5 According to some embodiments of the present application, optionally, the adjusting shaft 131 includes a first rotating portion 1311 and a second rotating portion 1312, one end of the first rotating portion 1311 is rotatably connected to the connecting rod 1324 through a connecting member 133, and the other end of the first rotating portion 1311 is provided with a limit member 1313, and the connecting rod 1324 rotates counterclockwise around the connecting member 133 to abut against the limit member 1313, and the first rotating portion 1311 and the second rotating portion 1312 abut against each other in the circumferential direction so that the first rotating portion 1311 and the second rotating portion 1312 rotate synchronously.

[0053] like Figure 3 and Figure 5 As shown, the limiter 1313 is located within the counterclockwise rotation range of the connecting rod 1324. This allows the connecting rod 1324 to rotate counterclockwise around the connecting rod 133, abutting against the limiter 1313 and driving the first rotating portion 1311 to rotate. Since there is no need to increase the stitch length during sewing, when the connecting rod 1324 rotates clockwise around the connecting rod 133, it rotates away from the limiter 1313. Due to the internal structure of the adjustment shaft 131 and the stitch length assembly, the first rotating portion 1311 can maintain its stitch length without changing with the clockwise rotation of the connecting rod 1324. In some embodiments, the connecting member 133 is an axial screw.

[0054] See also Figure 5 According to some embodiments of the present application, the limiting member 1313 may optionally be an eccentric wheel structure. When fine-tuning the stitch length is required, the eccentric wheel may be manually rotated to achieve fine-tuning of the encrypted stitch length.

[0055] like Figure 5As shown, the first rotating portion 1311 and the second rotating portion 1312 are in contact with each other in the circumferential direction. The end surface of the first rotating portion 1311 facing the second rotating portion 1312 has a limiting protrusion near the edge. The limiting protrusion has a limiting plane on the side facing the central axis of the second rotating portion 1312. The second rotating portion 1312 has a contact plane that abuts against the limiting plane. This makes the first rotating portion 1311 and the second rotating portion 1312 more firmly fixed and rotates synchronously. That is, when the connecting rod 1324 drives the first rotating portion 1311 to rotate, the second rotating portion 1312 rotates together with the first rotating portion 1311, and also ensures the accuracy of the stitch length adjustment component 130 in adjusting the stitch length.

[0056] According to some embodiments of the present application, optionally, the limiter 1313 is made of a flexible material to avoid noise caused by impact between the connecting rod 1324 and the limiter 1313 when the crank 120 drives the second transmission assembly 132 .

[0057] According to some embodiments of the present application, optionally, the first rotating portion 1311 is connected to a needle distance indicator plate 1314 , and the needle distance indicator plate 1314 is integrally formed with the first rotating portion 1311 .

[0058] like Figure 5 As shown, the needle distance indicator plate 1314 is in a long, bent shape, which can rotate synchronously with the first rotating part 1311, and the end of the needle distance indicator plate 1314 away from the first rotating part 1311 has a larger radius than the first rotating part 1311. When the needle distance indicator plate 1314 and the first rotating part 1311 rotate at the same angle, the rotation change of the needle distance indicator plate 1314 can be more clearly observed.

[0059] like Figure 6 As shown, according to some embodiments of the present application, optionally, a scale plate 180 is connected to the outer surface of the body 170, and a scale is provided on the surface of the scale plate 180. The position of the scale plate 180 is adapted to the stitch length indicator plate 1314. The end of the stitch length indicator plate 1314 away from the first rotating portion 1311 points to the scale, so that the stitch length size is digitally represented by the stitch length indicator plate 1314 and the scale plate 180, thereby intuitively understanding the change in stitch length, so that the staff can better supervise the stitch length status of the sewing device. Preferably, the scale plate 180 covers the stitch length indicator plate 1314, making the appearance of the sewing device more harmonious and beautiful.

[0060] When the thread locking mechanism 100 provided in the present application is used, the driving source 140 drives the crank 120 to rotate clockwise, driving the head ends of the first connecting rod 1121 and the first swing rod 1122 to move toward the direction close to the mounting plate 150, thereby causing the first swing rod 1122 to rotate counterclockwise around the middle end, and then causing the tail end of the first swing rod 1122 to rotate counterclockwise and drive the hook knife 111 to fork forward to open the bottom line.

[0061] At the same time, the crank 120 rotates clockwise, causing the slider 160 to move in the first slide groove 151 toward the direction away from the first swing rod 1122, thereby causing the swing crank 1321 and the second swing rod 1322 to move synchronously with the slider 160 near the end of the swing crank 1321, causing the second swing rod 1322 to rotate counterclockwise around the middle end, causing the second swing rod 1322 to move near the end of the second connecting rod 1323, driving the second connecting rod 1323 to move toward the direction close to the adjusting shaft 131, causing the second connecting rod 1323 to drive the connecting rod 1324 to rotate counterclockwise, thereby driving the adjusting shaft 131 to rotate counterclockwise, thereby completing the stitch length adjustment.

[0062] Then, the driving source 140 rotates counterclockwise for a short distance, and drives the crank 120 to rotate counterclockwise, driving the head ends of the first connecting rod 1121 and the first swinging rod 1122 to move in a direction away from the mounting plate 150, thereby causing the first swinging rod 1122 to rotate clockwise around the middle end, and then causing the tail end of the first swinging rod 1122 to rotate clockwise and drive the hook knife 111 to retreat. At this time, the hook knife 111 hooks the left needle thread and pulls the left needle thread out of a loop. At this time, the main shaft rotates for another half stitch, and the left needle thread passes through the hooked thread loop. Finally, the driving source 140 rotates counterclockwise again, driving the hook knife 111 to retreat again. At this time, the main shaft completes the last stitch. After trimming the thread, the entire sewing is completed, and a "Q"-shaped knot will eventually be formed.

[0063] The present application also provides a sewing device, comprising the thread locking mechanism 100 of any of the above-mentioned embodiments.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A thread locking mechanism, characterized in that: include: crank; The wire locking assembly includes a hook knife, wherein the hook knife is connected to the crank via a first transmission assembly, and the rotation of the crank can drive the hook knife to move; The stitch length adjustment assembly comprises an adjustment shaft for adjusting the stitch length, the adjustment shaft is connected to the crank through a second transmission assembly, and the rotation of the crank can drive the adjustment shaft to move; the second transmission assembly comprises a swing crank, a second swing rod, a second connecting rod and a connecting rod, the swing crank, the second swing rod, the second connecting rod and the connecting rod are connected end to end in sequence and are all rotatably connected, the end of the swing crank away from the second swing rod is connected to the crank, the end of the connecting rod away from the second connecting rod is rotatably connected to the adjusting shaft, and the rotation of the connecting rod can drive the adjustment shaft to rotate in the same direction, the thread locking mechanism also includes a body, the middle end of the second swing rod is also rotatably connected to the body, and the middle end is located between the second swing rod connecting the swing crank and the second swing rod connecting the second connecting rod; A driving source, wherein an output end of the driving source is connected to the crank to drive the crank to rotate.

2. The thread locking mechanism according to claim 1, characterized in that: The driving source is connected to a mounting plate, and the mounting plate and the crank are slidably connected via a slider.

3. The thread locking mechanism according to claim 2, characterized in that: The mounting plate and the crank are respectively provided with a first slide groove and a second slide groove, one end of the slider is slidingly connected to the first slide groove, and the other end is slidingly connected to the second slide groove, wherein the first slide groove is arranged along the tangent direction of the crank rotation circle, and the second slide groove is arranged along the radial direction of the crank rotation circle.

4. The thread locking mechanism according to claim 3, characterized in that: The mounting plate is fixed to the machine body.

5. The thread locking mechanism according to claim 4, characterized in that: The first transmission assembly includes a first connecting rod and a first swing rod, one end of the first connecting rod is rotatably connected to the crank, and the other end is rotatably connected to the head end of the first swing rod, the tail end of the first swing rod is connected to the hook knife, and the middle end of the first swing rod is rotatably connected to the machine body, and the middle end is located between the head end and the tail end.

6. The thread locking mechanism according to claim 4, characterized in that: The counterclockwise rotation of the connecting rod can drive the adjusting shaft to rotate in the same direction.

7. The thread locking mechanism according to claim 1, characterized in that: The adjusting shaft includes a first rotating part and a second rotating part. The first rotating part is rotatably connected to the connecting rod through a connecting piece. The first rotating part is provided with a limit piece. The connecting rod can rotate around the connecting piece to abut against the limit piece. The first rotating part and the second rotating part maintain abutment with each other in the circumferential direction so that the first rotating part and the second rotating part rotate synchronously.

8. The thread locking mechanism according to claim 7, characterized in that: The limiting component is made of flexible material.

9. The thread locking mechanism according to claim 7, characterized in that: The first rotating part is connected to a needle distance indicator plate, and the needle distance indicator plate and the first rotating part are integrally formed.

10. A sewing device, characterized in that: The invention comprises a thread locking mechanism as claimed in any one of claims 1 to 9.

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