Trimming device of industrial sewing machine and control method of trimming device

Abstract

The invention particularly relates to an industrial sewing machine thread trimming device and a control method thereof.The thread trimming device comprises a fixed cutter and a movable cutter, the movable cutter is installed on a support and can slide, an upper thread and a bottom thread are hooked to the fixed cutter to complete thread trimming operation, in the process, the movable cutter enables a needle head to be placed in a hook-shaped structure on the movable cutter through the receding action, and the needle head is fixed to the fixed cutter; according to the thread trimming cutter, the hook-shaped structure of the movable cutter is sleeved with an upper thread, the movable cutter is driven by the arranged driving assembly to make contact with the fixed cutter to complete thread trimming, the movable cutter has the buffering allowance in the retraction process, a needle head can be prevented from being broken, meanwhile, a misoperation protection mode is arranged, and timely shutdown can be guaranteed when the needle head abuts against the movable cutter; in addition, the elastic component is arranged to play a role in buffering the impact load generated when the movable cutter makes contact with the fixed cutter, and the reliability of thread trimming operation can be further improved by increasing the action borne by the support.

Description

Technical Field

[0001] The invention belongs to the technical field of sewing machines, and in particular relates to a thread trimming device for an industrial sewing machine and a control method thereof. Background Art

[0002] In existing sewing equipment, the thread trimming device mainly realizes the synchronous cutting of the upper thread and the lower thread through the meshing movement of the fixed knife and the movable knife. According to the technical solution disclosed in the Chinese invention patent CN221971841U, the fixed knife and the movable knife are arranged above the rotary shuttle and below the needle. Its working principle is: the movable knife is displaced toward the fixed knife through the driving mechanism, and the double thread is cut by the shearing action between the two cutting edges, and then the movable knife is reset by the torsion spring mechanism.

[0003] However, this technical solution has significant technical defects in practical application: during the thread cutting process, fiber debris of the upper and lower threads (hereinafter referred to as "thread lint") will inevitably adhere to the tool working surface. After long-term operation, the continuous accumulation of thread lint will cause the following technical problems: First, excessive thread lint will significantly increase the friction coefficient between the moving and fixed knives, resulting in the torsion spring driving torque being insufficient to overcome the friction resistance, causing the moving knife to fail to reset, and then causing mechanical interference with the moving knife when the needle moves downward, eventually leading to tool breakage; second, the fiber layer formed by the accumulation of thread lint will change the tool gap parameters, causing the fixed knife to bear abnormal impact loads, accelerating the wear process of the tool, and thus significantly reducing the service life of the device. Summary of the invention

[0004] The purpose of the present invention is to at least solve the problem that the existing sewing machine thread trimming device is prone to the problem that the moving knife and the fixed knife are easily attached with thread lint during use, which causes the fixed knife to be subjected to greater impact and the fixture to be worn, and the moving knife fails to reset due to excessive wear. This purpose is achieved through the following technical solutions:

[0005] A first aspect of the present invention provides an industrial sewing machine thread trimming device, comprising:

[0006] Fixed knife;

[0007] A movable knife cooperates with the fixed knife to complete thread cutting, and the movable knife has a hook structure for hooking the thread;

[0008] A bracket for mounting a movable knife, the bracket sliding along a first direction of the fixed knife, the bracket being spaced apart from the fixed knife along a right side of a second direction of the fixed knife, the first direction and the second direction being perpendicular to each other, and the movable knife being able to slide along the second direction relative to the bracket;

[0009] A first drive assembly for installing the bracket, a first elastic component acting between the first drive assembly and the bracket, and the first elastic component applies a force to the bracket to move away from the first drive assembly, a second drive assembly and a third drive assembly are slidably installed in the first drive assembly, a second elastic component acts between the second drive assembly and the third drive assembly, and the third drive assembly is acted upon by the second elastic component to drive the bracket to move closer to the first drive assembly;

[0010] a first drive device for driving the first drive assembly to reciprocate in a first direction;

[0011] A second drive device is used to drive the second drive assembly to reciprocate in a first direction relative to the first drive assembly.

[0012] In some embodiments, the movable knife can move relative to the bracket along a third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

[0013] In some embodiments, a third elastic component is provided between the movable knife and the bracket, and the third elastic component applies a force acting along the second direction to the movable knife.

[0014] In some embodiments, a fourth elastic component is provided between the movable knife and the bracket, and the fourth elastic component applies a force acting along a third direction to the movable knife. A pressure detection component is installed between the bracket and the movable knife, and the distance that the movable knife moves along the second direction is greater than the distance that the movable knife moves along the third direction.

[0015] In some embodiments, the outer portion of the hook-shaped structure on the movable knife is arc-shaped, and the inner portion of the hook-shaped structure of the movable knife cooperates with the fixed knife to complete thread cutting.

[0016] In some embodiments, the pressure detection assembly includes an elastic airbag installed between the bracket and the moving knife, and the elastic airbag is connected to a pressure sensor installed on the first driving assembly through an air tube.

[0017] In some embodiments, a fifth elastic component is disposed between the second driving assembly and the first driving assembly, and the fifth elastic component is used to buffer the force applied when the second driving device drives the second driving assembly to move.

[0018] In some embodiments, the limit elastic force of the first elastic component is smaller than the limit elastic force of the second elastic component.

[0019] In some embodiments, a limit block is installed on the bracket, and the limit block is restricted from moving between the first driving assembly and the third driving assembly.

[0020] The present invention also provides a control method for the above-mentioned thread trimming device of the industrial sewing machine, comprising the following steps:

[0021] Step 1: Send a wire trimming command to the control host;

[0022] Step 2: The first driving device and the second driving device are operated simultaneously, respectively driving the first driving assembly and the second driving assembly to move, driving the movable knife to approach the fixed knife. At the same time, the control host drives the needle and the rotary shuttle of the sewing machine to move, so that the movable knife is in contact with the needle. The movable knife is touched by the needle and the third elastic component is compressed to make the movable knife give way. The thread divider on the rotary shuttle divides the upper thread. When the movable knife moves to the set position, the needle is located inside the hook structure of the movable knife. Then, after the rotary shuttle releases the upper thread, the upper thread is hooked on the hook structure of the movable knife.

[0023] Step 3: The first driving device is activated first to drive the movable knife to retract. After the first driving device retracts one end distance, the second driving device is activated, and the first driving device and the second driving device are retracted to the initial position at the same time, and the movable knife and the fixed knife complete the thread cutting operation;

[0024] It also includes an anti-misoperation protection mode. During step 2 and step 3, after the installed pressure detection component detects that the pressure exceeds the set threshold, the control host receives a signal to start the shutdown, interrupting the movement of the needle and the shuttle and stopping the execution of steps 2 and 3. After resetting the needle, the control host continues to execute step 2 or step 3.

[0025] The thread trimming device of a sewing machine of the present invention comprises a fixed knife and a movable knife. The movable knife is installed on a bracket and can slide to hook the upper thread and the lower thread to the fixed knife to complete the thread trimming operation. In this process, the movable knife places the needle inside the hook-shaped structure on the movable knife through a yielding action, so that the upper thread is sleeved on the hook-shaped structure of the movable knife, and drives the movable knife to contact with the fixed knife through a set driving component to complete the thread trimming. Among them, the movable knife has a buffer margin during the retraction process, which can avoid breaking the needle. At the same time, an error operation protection mode is set. When the needle presses the movable knife, it can ensure timely shutdown, interrupt the movement of the needle, the shuttle and the movable knife, and protect the needle from being broken. In addition, the elastic component is set to buffer the impact load when the movable knife contacts the fixed knife, and the reliability of the thread trimming operation can be improved by increasing the action on the bracket.

[0026] The present invention moves the fixed knife to the side of the rotary hook, and the thread end is separated from the core area of ​​the rotary hook when cutting the thread, which fundamentally avoids the problem of thread lint retention caused by traditional cutting above the rotary hook, and significantly reduces the risk of the rotary hook getting stuck. At the same time, because the fixed knife needs to pull the upper thread and the lower thread to one side of the rotary hook, the stroke of the moving knife is increased, which avoids the problem that the thread end is too short after cutting the thread, resulting in the thread end falling off or unable to start sewing normally during sewing, and the lower thread end retracting into the inside of the rotary hook. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 is a front view of a thread trimmer according to an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 A schematic diagram of the structure of the thread trimming device shown in another perspective;

[0030] Figure 3 yes Figure 1 The structural schematic diagram of the thread cutting device shown in;

[0031] Figure 4 yes Figure 3 A schematic structural diagram of the thread trimming device shown in another perspective;

[0032] Figure 5 yes Figure 3 The structure of the thread trimmer shown in FIG. 1 is a schematic diagram of the structure of the first drive assembly after the section Figure 1 ;

[0033] Figure 6 yes Figure 3 The structure of the thread trimmer shown in FIG. 1 is a schematic diagram of the structure of the first drive assembly after the section Figure 2 ;

[0034] Figure 7 yes Figure 5 The structure diagram of the thread trimmer device shown in FIG. 1 after the first drive assembly and the fixed knife are hidden Figure 1 ;

[0035] Figure 8 yes Figure 5 The structure diagram of the thread trimmer device shown in FIG. 1 after the first drive assembly and the fixed knife are hidden Figure 2 ;

[0036] Fig. 9 yes Figure 7 A schematic diagram of the structure of the thread trimmer device shown in FIG. 1 after hiding the second drive assembly and the fifth elastic member;

[0037] Fig.10 yes Fig. 9 FIG. 1 is an enlarged schematic diagram of the structure of the thread trimming device shown in FIG.

[0038] Fig.11 yes Figure 7A schematic diagram of the structure of the movable knife of the thread cutting device shown in FIG.

[0039] Fig.12 is a schematic structural diagram of a thread trimming device according to another embodiment of the present invention;

[0040] Fig.13 yes Fig.12 A partial schematic diagram of the thread trimming device shown in ;

[0041] Fig.14 yes Fig.12 A schematic diagram of the structure of the arc-shaped top block of the thread trimming device shown in ;

[0042] Fig.15 yes Fig.13 A schematic diagram of the structure of the matching block of the thread trimming device shown in FIG.

[0043] Fig.16 yes Fig.12 A schematic diagram of the embodiment shown in which the matching block contacts the arc-shaped top block when the self-setting knife faces the needle head;

[0044] Fig.17 yes Fig.12 A schematic diagram of the embodiment shown in which the matching block contacts the knife arc block when the needle head is facing the fixed knife;

[0045] Fig.18 This is a structural diagram of the connection between the first drive component and the second drive component (the first drive component is made transparent).

[0046] The symbols in the accompanying drawings are as follows:

[0047] 1. Fixed knife;

[0048] 200, movable knife; 201, hook-shaped structure; 202, main body; 203, first slide column; 204, second slide groove;

[0049] 300, bracket; 301, limit block; 302, housing component; 303, first slide groove; 304, second slide column; 305, guide rod; 3051, boss; 3052, frame-shaped guide column; 306, guide rod;

[0050] 400, first driving assembly; 401, guide groove; 402, long sliding hole; 403, guide rod;

[0051] 5. A first elastic component;

[0052] 600, second driving assembly; 601, inner groove; 602, cylinder; 603, driving plate;

[0053] 7. The third drive assembly;

[0054] 8. A second elastic member;

[0055] 9. A first driving device;

[0056] 10. A second driving device;

[0057] 11. A third elastic member;

[0058] 12. a fourth elastic member;

[0059] 1300, pressure detection component; 1301, elastic airbag;

[0060] 14. fifth elastic member;

[0061] 15. Rotary hook;

[0062] 16. Noodles;

[0063] 17. Bottom line;

[0064] 18. Arc-shaped top block;

[0065] 19. Matching block. DETAILED DESCRIPTION

[0066] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0067] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0068] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0069] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0070] refer to Figure 1-11 In terms of overall design, an embodiment of the present invention provides an industrial sewing machine thread trimming device, including a fixed knife 1 located on one side of the rotary hook along the first direction. The embodiment provided by the present invention is that the fixed knife 1 is located on the front side of the rotary hook along the first direction, and the movable knife 200 cooperates with the fixed knife 1 to complete the thread trimming. Figure 2 The figure shows a state of the movable knife 200 of the present invention when performing a thread trimming operation. It should be understood that, considering that the existing thread trimming device is arranged directly above the rotary hook of the sewing machine and will interfere with the needle when it is not reset, and at the same time, thread trimming directly above the rotary hook will also cause thread lint to accumulate on the rotary hook, interfering with the operation of the rotary hook. The fixed knife 1 in this embodiment is no longer arranged directly above the rotary hook. The movable knife 200 needs to drive the bottom thread 17 and the surface thread 16 to approach the fixed knife 1 to complete the thread trimming operation, thereby avoiding the accumulation of thread lint on the rotary hook. The movable knife 200 has a hook-shaped structure 201 for hooking the thread. In order to meet the requirement that the movable knife 200 can hook the surface thread 16 and the bottom thread 17, it also includes a bracket 300 for mounting the movable knife 200. The bracket 300 can reciprocate along the first direction of the fixed knife 1. The bracket 300 is spaced apart from the fixed knife 1 on the right side of the second direction of the fixed knife 1. The first direction and the second direction are perpendicular to each other, and the movable knife 200 can slide reciprocatingly along the second direction relative to the bracket 300.

[0071] In order to ensure the movement of the movable knife 200, a first drive assembly 400 for installing the bracket 300 is also included. A first elastic component 5 acts between the first drive assembly 400 and the bracket 300, and the first elastic component 5 applies a force to the bracket 300 away from the first drive assembly 400. A second drive assembly 600 and a third drive assembly 7 are respectively installed in the first drive assembly 400 to slide back and forth along the first direction. A second elastic component 8 acts between the second drive assembly 600 and the third drive assembly 7, and the second drive assembly 600 can drive the third drive assembly 7 to move in the first direction through the second elastic component 8. The third drive assembly 7 exerts a force on the bracket 30 0 applies a force so that the bracket 300 is subjected to a force approaching the first driving assembly 400 along the first direction, and also includes a first driving device 9 for driving the first driving assembly 400 to reciprocate in the first direction, and a second driving device 10 installed on the first driving assembly 400, the second driving device 10 is used to drive the second driving assembly 600 to reciprocate in the first direction relative to the first driving assembly 400, that is, in this embodiment, it can meet the requirements of the first driving device 9 and the second driving device 10 driving the movable knife 200 to hook the upper thread 16 and the lower thread 17, and the upper thread 16 and the lower thread 17 are cut through the cooperation between the fixed knife 1 and the movable knife 200.

[0072] It should be understood that the first direction of the fixed knife 1 satisfies the bracket 300 to drive the movable knife 200 to approach the surface line 16 and the bottom line 17. The perpendicularity of the first direction and the second direction ensures that the movable knife 200 will move parallel to the fixed knife 1, thereby ensuring that the movable knife 200 cooperates with the fixed knife 1 to complete the thread cutting operation.

[0073] It should be understood that the operation of the existing sewing machine is roughly the following process: the position of the bottom thread 17 does not change, the upper thread 16 is inserted on the needle and needs to be driven by the needle to pass through the fabric, and then the thread puller on the rotary hook pulls the upper thread 16, and as the rotary hook continues to rotate, the upper thread 16 is released and lifted up to cover the bottom thread 17 through the reset of the needle, and then a sewing operation can be completed;

[0074] To ensure that the surface thread 16 can be hooked by the movable knife 200, in the present embodiment, it is necessary to ensure that the needle has passed through the fabric and the thread puller separates the surface thread 16. At this time, the hook structure 201 on the movable knife 200 is located at the needle head. This ensures that after the surface thread 16 is released by the thread puller, as the needle head is reset, the surface thread 16 is blocked by the hook structure 201 on the movable knife 200. Then the movable knife 200 can hook the bottom thread 17 and the surface thread 16 at the same time and move them toward the fixed knife 1. Therefore, in the present embodiment, the movable knife 200 can slide in the second direction relative to the bracket 300, that is, the movable knife 200 needs to make way when approaching the needle head to avoid the obstruction of the needle head, and place the needle head inside the hook structure 201 after resetting.

[0075] The thread trimming device of an industrial sewing machine disclosed in the present application arranges a fixed knife 1 at a position in front of a rotary hook 15 along a first direction to avoid the problem of thread lint accumulation and needle interference caused when the fixed knife 1 of a traditional thread trimming device is located directly above the rotary hook 15, wherein the fixed knife 1 and the movable knife 200 constitute a core matching unit for thread trimming operation, a hook-shaped structure 201 is provided on the movable knife 200 for stably hooking the upper thread 16 and the lower thread 17, and a bracket 300 is used to reciprocate along the first direction of the fixed knife 1 to realize parallel and synchronous movement between the movable knife 200 and the fixed knife 1, and the bracket 300 forms a reasonable interval with the fixed knife 1 along the second direction of the fixed knife 1, so that the movable knife 200 can move relative to the bracket 300 along the second direction when it is close to the needle. The first drive device 9 and the second drive device 10 drive the bracket 300 to realize the precise reciprocating motion of the bracket 300 and the movable knife 200 along the first direction, and provide sufficient buffer margin during the resetting process of the movable knife 200 to prevent mechanical interference due to the needle not completely withdrawing from the motion range of the movable knife 200. The industrial sewing machine thread trimming device described in the present application significantly improves the stability and safety of the thread trimming operation by optimizing the layout of the fixed knife 1 and the design of the coordinated movement of the hook structure on the movable knife 200 and the bracket 300, and effectively avoids the thread trimming errors and equipment damage risks caused by thread lint accumulation and needle interference in traditional thread trimming devices. At the same time, it realizes the synchronous and precise guidance of the upper thread 16 and the lower thread 17 during the cutting process, ensuring that the cut thread ends can be accurately guided to the subsequent sewing process and maintain a stable state. The balanced regulation between each drive component and the elastic element during continuous high-speed operation provides sufficient buffer margin for the equipment, thereby reducing the wear and failure risks caused by mechanical impact. The structure is compact and meets the strict requirements of industrial sewing for thread trimming accuracy, speed and stability.

[0076] In some embodiments of the present invention, the outer portion of the hook-shaped structure 201 of the movable knife 200 is arc-shaped, so that after the movable knife 200 contacts the needle, it will slide to the right along the second direction relative to the bracket 300 due to the obstruction of the needle through the arc-shaped outer structure, thereby automatically giving way to avoid direct interference from the needle. After the hook-shaped structure 201 on the movable knife 200 is separated from the needle, the movable knife 200 is reset. At this time, the bottom line 17 and the surface line 16 will be located inside the hook-shaped structure 201 of the movable knife 200, ensuring that the wire material always remains in a stable and controlled state before cutting. After the movable knife 200 is close to the fixed knife 1, the inside of the hook-shaped structure 201 of the movable knife 200 cooperates with the fixed knife 1 to complete the wire cutting.

[0077] In some embodiments of the present invention, in order to ensure that the movable knife 200 can be reset to ensure that the needle is located inside the hook structure 201 of the movable knife 200 after sliding to the right along the second direction relative to the bracket 300 due to the obstruction of the needle through the arc-shaped external structure, a third elastic component 11 is provided between the movable knife 200 and the bracket 300, and the third elastic component 11 applies a force acting in the second direction to the movable knife 200. After the movable knife 200 is touched by the needle, the third elastic component 11 will be compressed, and then after the movable knife 200 continues to move until it is no longer in contact with the needle, the movable knife 200 will be reset by the third elastic component 11, and the needle is placed inside the hook structure 201 of the movable knife 200. Specifically, the third elastic component 11 can be a spring. In this embodiment, the arc structure of the hook structure 201 on the movable knife 200 is used to achieve During the thread trimming operation, the knife 200 automatically gives way by touching the needle, which can ensure that the movable knife 200 stays at the needle accurately, making it convenient for the rotary shuttle 15 to hook the surface thread 16 after releasing the movable knife 200. The present application optimizes the hook structure 201 on the movable knife 200 and sets its exterior to an arc shape, so that the movable knife 200 can use its arc-shaped outer contour to automatically slide sideways under the blocking action of the needle during the thread trimming process. After giving way, during the resetting process, it ensures that the bottom thread 17 and the surface thread 16 are completely received in the hook structure 201 and form a precise mesh with the fixed knife 1, thereby achieving stable and synchronous cutting of the wire, effectively avoiding the risk of equipment wear and needle damage caused by direct contact between the needle and the knife in the traditional thread trimming device, and significantly improving the safety, reliability and overall operation stability of the thread trimming operation.

[0078] It should be understood that when the movable knife 200 is reset and approaches the fixed knife 1, the needle may be lifted but has not left the moving range of the movable knife 200. In order to avoid mechanical interference between the movable knife 200 and the needle during the reset process, which may cause the needle to break, in this embodiment, a first elastic component 5 acts between the first drive assembly 400 and the bracket 300, and the first elastic component 5 applies a force to the bracket 300 along the first direction and away from the first drive assembly 400. That is, under the action of the first elastic component 5, the bracket 300 will drive the movable knife 200 to move along the first direction and away from the first drive assembly 400. To ensure that the bracket 300 does not directly separate from the first drive assembly 400 under the action of the first elastic component 5, the bracket 300 needs to be limited. In this example, The second drive assembly 600 and the third drive assembly 7 are respectively slidably installed in the first drive assembly 400, and a second elastic component 8 acts between the second drive assembly 600 and the third drive assembly 7. The second drive assembly 600 drives the third drive assembly 7 to move forward in the first direction through the action of the second elastic component 8. The third drive assembly 7 applies a force to the bracket 300, so that the bracket 300 moves along the first direction toward the first drive assembly 400, that is, the bracket 300 is limited by the third drive assembly 7. The elastic forces of the second elastic component 8 and the first elastic component 5 offset each other, so that when the bracket 300 is in an idle state, the second elastic component 8 limits the distance of the bracket 300 away from the first drive assembly 400.

[0079] In some embodiments of the present invention, a limit block 301 placed in the first drive component 400 is fixed on the bracket 300, and the limit block 301 is placed in the direction of the third drive component 7 away from the movable knife 200 and the limit block 301 is in contact with the third drive component 7. In this embodiment, the second drive component 600 provides a driving force through an external second drive device 10 to drive the second drive component 600 to reciprocate along the first direction, that is, the movement of the second drive component 600 is not controlled by the second elastic component 8, but only by the external second drive device 10. Therefore, under the action of the second elastic component 8, the third drive component 7 will have a tendency to move along the front side of the first direction (that is, move away from the second drive component 600). At the same time, because the bracket 300 is acted upon by the first elastic component 5, it has a tendency to move along the first direction. There is a tendency to move in a rearward direction (i.e., move closer to the second drive component 600), the third drive component 7 will always be in contact with the limit block 301, that is, essentially the bracket 300 will be simultaneously acted upon by the first elastic component 5 and the second elastic component 8, and the balance of the forces between the first elastic component 5 and the second elastic component 8 determines the distance of the bracket 300 away from the first drive component 400. Therefore, when the bracket 300 is acted upon by the first elastic component 5 and the second elastic component 8, when the movable knife 200 is at the needle position, during the resetting process of the movable knife 200, if the needle has not been lifted to a position away from the moving range of the movable knife 200, the movable knife 200 will be blocked by the needle, and when the first drive component 400 retracts, the movable knife 200 will not retract with the bracket 300. In addition, when the movable knife 200 needs to retract and reset, the second drive component 600 also needs to move forward in the first direction. When the second drive component 600 moves forward in the first direction, it will not directly contact the third drive component 7, but will compress the second elastic component 8, thereby giving the movable knife 200 a buffer margin of a certain distance, ensuring that the needle can be completely moved out of the moving range of the movable knife 200, avoiding the problem of the needle being broken by the movable knife 200.

[0080] In some embodiments of the present invention, the first elastic component 5 and the second elastic component 8 may be springs.

[0081] The industrial sewing machine thread trimming device described in the present application effectively prevents mechanical interference and needle breakage caused by the needle not being completely detached during the resetting process of the movable knife 200 by adopting the mechanical balance adjustment of the first elastic component 5 and the second elastic component 8, the precise limiting of the third drive component 7 and the limit block 301, and the active driving action of the second drive component 600, so that the movable knife 200 can maintain a stable relative position when blocked by the needle, and gradually realize buffering and retraction under the action of the external drive device, ensuring that the needle is always firmly covered by the hook structure of the movable knife 200 after resetting, so that the upper thread 16 and the lower thread 17 always remain in a stable and controlled state before being cut.

[0082] It should be understood that in this embodiment, the movable knife 200 not only needs to have a buffer margin to ensure that the needle will not be broken when resetting, but also needs to have a buffer when the movable knife 200 cooperates with the fixed knife 1 to complete the thread cutting operation, so as to avoid the movable knife 200 from exerting an excessive impact load on the fixed knife 1 when the movable knife 200 is directly hard-connected, thereby causing the fixed knife 1 to be worn and the service life to be reduced;

[0083] Specifically, the first drive assembly 400 is driven by the first drive device 9 to reciprocate in the first direction, and the second drive device 10 is installed on the first drive assembly 400. The second drive assembly 600 is driven by the second drive device 10 to reciprocate in the first direction relative to the first drive assembly 400. It should be understood that when the first drive assembly 400 moves, the second drive assembly 600 will move synchronously with the first drive assembly 400. According to the above, in this embodiment, the bracket 300 is simultaneously acted upon by the first elastic component 5 and the second elastic component 8, and the second elastic component 8 acts between the second drive assembly 600 and the third drive assembly 7. The front side surface of the third drive assembly 7 in the first direction contacts the limit block 301 installed on the bracket 300, so that the sliding of the second drive assembly 600 will cause the distance between the second drive assembly 600 and the third drive assembly 7 to change, thereby changing the force exerted by the second elastic component 8 on the third drive assembly 7 The force of the third driving assembly 7 applies a force to the limit block 301 on the bracket 300, thereby affecting the movement of the bracket 300. Therefore, in this embodiment, the second driving assembly 600 drives the bracket 300 to move relative to the first driving assembly 400, that is, when the movable knife 200 and the fixed knife 1 perform the thread trimming operation, the first driving assembly 400 and the second driving assembly 600 both need to retract to the initial state. At the same time, during the retraction of the second driving assembly 600, the second elastic component 8 will be compressed, and the movable knife 200 contacts the fixed knife 1 under the action of the second elastic component 8 to complete the thread trimming. It can be foreseen that the force applied by the second elastic component 8 to the movable knife 200 can be adjusted by sliding the second driving assembly 600, thereby adjusting the impact load when the movable knife 200 contacts the fixed knife 1. The second elastic component 8 can also play a role in buffering the impact load, and the force of the second elastic component 8 is increased by the continuous movement of the second driving assembly 600, thereby improving the reliability of the thread trimming operation.

[0084] In some embodiments of the present invention, shear force is used between the movable knife 200 and the fixed knife 1 to cut the bottom thread 17 and the surface thread 16. Alternatively, extrusion and friction between the movable knife 200 and the fixed knife 1 are used to cut the bottom thread 17 and the surface thread 16.

[0085] The industrial sewing machine thread trimming device described in the present application effectively prevents the risk of the movable knife 200 breaking due to mechanical interference with the needle during the resetting process through the precise coordination between the first drive device 9, the second drive device 10 and the elastic component, and the impact load between the movable knife 200 and the fixed knife 1 is adjusted by the second elastic component 8, thereby achieving a smooth buffering of the thread trimming process, so that in the thread trimming operation, whether the shear force or the extrusion friction method is used, it can ensure that the bottom thread 17 and the surface thread 16 always remain in a stable and controlled state before cutting, which greatly improves the thread trimming accuracy and the service life of the equipment, and at the same time significantly reduces the equipment wear and maintenance costs caused by mechanical impact under high-speed continuous operation conditions.

[0086] In some embodiments of the present invention, the maximum elastic force of the first elastic component 5 is smaller than the maximum elastic force of the second elastic component 8 , ensuring that the movement of the second driving assembly 600 can reliably drive the bracket 300 to move.

[0087] In some embodiments of the present invention, a fifth elastic component 14 is provided between the second driving component 600 and the first driving component 400 . The fifth elastic component 14 may be a spring to increase the stability of the second driving component 600 when it is driven by the second driving device 10 .

[0088] In some embodiments of the present invention, the first driving device 9 and the second driving device 10 both use electric telescopic rods, which have the advantages of convenient control and high reliability.

[0089] This arrangement, by utilizing the difference in maximum elastic force between the first elastic component 5 and the second elastic component 8 and the auxiliary effect of arranging the fifth elastic component 14 between the second drive component 600 and the first drive component 400, not only effectively buffers the impact load between the movable knife 200 and the fixed knife 1 during the thread cutting process, thereby preventing equipment wear and needle damage caused by direct hard connection, but also ensures that the bracket 300 can be reliably displaced through the second drive component 600 under the drive of the first drive component 400, thereby achieving precise engagement between the movable knife 200 and the fixed knife 1 during the shearing process, and at the same time, through the coordinated adjustment between the drive components and the elastic components, the thread cutting operation is maintained at a high level of accuracy and consistency.

[0090] It should be noted that in this embodiment, there may be a problem of misoperation, that is, after the movable knife 200 moves to the needle position, the needle is raised and the sewing operation is continued by mistake. At this time, if the needle is not stopped from descending, the needle may still break. This embodiment also provides a protection program to prevent misoperation.

[0091] Specifically, the movable knife 200 can reciprocate along the third direction relative to the bracket 300, and the third direction is perpendicular to the first direction and the second direction respectively, that is, the movable knife 200 can move in the same direction as the needle, ensuring that when the needle presses the movable knife 200, the movable knife 200 can move with the needle to provide a buffer for the needle and prevent the needle from breaking after a violent collision with the movable knife.

[0092] In some embodiments of the present invention, a fourth elastic component 12 is provided between the movable knife 200 and the bracket 300. The fourth elastic component 12 may be a spring. The fourth elastic component 12 applies an upward force along the third direction to the movable knife 200 to ensure the resetting of the movable knife 200. During the actual operation of the movable knife 200, the fourth elastic component 12 may follow the movable knife 200 to move in the second direction. Similarly, the third elastic component 11 may also follow the movable knife 200 to move along the third direction. It should be understood by those skilled in the art that it is not limited to the above structure, as long as the effect achieved is that the third elastic component 11 and the fourth elastic component 12 do not affect the movement of the movable knife 200 in the second direction and the third direction.

[0093] In some embodiments of the present invention, a pressure detection assembly 1300 is installed between the bracket 300 and the movable knife 200, so that after the needle presses the movable knife 200 so that the movable knife 200 compresses the fourth elastic component 12 and moves downward along the third direction, the movable knife 200 will synchronously cause the pressure value measured by the pressure detection assembly 1300 to increase. After the movable knife 200 moves a certain distance, the pressure value measured by the pressure detection assembly 1300 exceeds the threshold value, and the protection program of the control host is triggered at this time to stop the actions of the needle, the rotary shuttle, the bracket and the second drive assembly 600. It can be foreseen that when the pressure value measured by the pressure detection assembly 1300 exceeds the threshold value, the movable knife 200 has not reached the limit position of the movement in the third direction, ensuring that the needle will not be broken. At the same time, the safety distance of the movable knife 200 moving in the second direction is greater than the distance of the movable knife 200 moving in the third direction, that is, when the movable knife 200 is touched by the needle to produce a giving way action, the pressure measured by the pressure detection assembly 1300 will not exceed the threshold value, thereby avoiding the false triggering of the protection program.

[0094] In some embodiments of the present invention, the pressure detection component 1300 includes an elastic airbag 1301 installed between the bracket 300 and the movable knife 200. The elastic airbag 1301 is connected to a pressure sensor installed on the first drive component 400 through an air pipe. It is foreseeable that the pressure sensor measures the gas pressure in the elastic airbag 1301. When the movable knife 200 is pressed by the needle and moves downward along the third direction, the elastic airbag 1301 will be squeezed, thereby causing the gas pressure in the elastic airbag 1301 to increase. The data detected by the pressure sensor is fed back to the control host. When the value read by the control host is greater than the set threshold, the protection program is started. The degree of pressure on the movable knife 200 is quickly detected by a pressure sensor that can respond quickly, which can solve the problem of the needle and the movable knife being broken due to human error during thread trimming operations.

[0095] An alternative solution is to refer to Figure 12-17In some embodiments of the present invention, the giving way action of the movable knife 200 does not need to contact the needle. When the movable knife 200 approaches the needle, it is acted to give way, and then the hook structure 201 on the movable knife 200 passes over the needle to reset the movable knife 200. Specifically, it includes an arc-shaped top block 18, which is arranged at a position on the left side of the second direction relative to the movable knife 200. At the same time, the arc-shaped top block 18 and the fixed knife 1 are not located in the same plane (specifically, the arc-shaped top block 18 can be arranged to be higher than the fixed knife 1, and the matching block 19 is also arranged to be higher than the fixed knife 1, so that the matching block 19 can pass over the fixed knife 1 during the retraction process). A matching block 19 for contacting the arc-shaped top block 18 is installed on the upper side of the movable knife 200, and the arc-shaped top block 18 protrudes toward the right side in the second direction, so that when the movable knife 200 moves, After approaching the needle to a set distance, the arc-shaped top block 18 will contact the matching block 19. Through the contact and cooperation between the arc-shaped top block 18 and the matching block 19, the movable knife 200 will be displaced to the right in the second direction, the third elastic component 11 is compressed, and the movable knife 200 continues to move toward the needle. After passing the needle, the arc-shaped top block 18 is disengaged from the matching block 19, and the movable knife 200 will move to the left in the second direction under the action of the third elastic component 11 to reset, thereby satisfying the requirement of placing the needle inside the hook structure 201 on the movable knife 200. Specifically, the arc-shaped top block 18 has a first arc-shaped fillet between the front side surface along the first direction and the right side surface along the second direction, so that when the matching block 19 moves toward the needle, when it touches the arc-shaped fillet, the arc-shaped fillet can cause the movable knife 200 to move to the right in the second direction, thereby avoiding the needle. When the matching block 19 continues to move toward the needle head and passes over the arc-shaped top block 18, the movable knife 200 is reset under the action of the third elastic member 11. The matching block 19 is located within the range of the arc-shaped fillet of the arc-shaped top block 18 on the left side in the second direction, so that the matching block 19 can directly contact the arc-shaped fillet when moving from the first direction toward the needle head, thereby forcing the matching block 19 to move to the right side in the second direction;

[0096] It should be understood that when the movable knife 200 hooks the upper thread 16 and the lower thread 17 and moves back along the front side of the first direction and moves toward the fixed knife 1, if the arc-shaped top block 18 also touches the matching block 19, the movable knife 200 will be displaced to the right side along the second direction. At this time, the upper thread 16 has been placed on the hook structure 201 on the movable knife 200, but the position of the lower thread 17 is close to that of the needle, which may cause the movable knife 200 to be directly offset from the lower thread 17, resulting in a failure to hook the thread. In order to solve this problem, refer to Figure 12-18As an embodiment, the bottom surface of the arc-shaped top block 18 (below along the third direction) is an inclined surface or an arc surface that gradually rises from front to back along the first direction, or a second arc-shaped fillet is formed between the bottom surface and the rear side surface of the arc-shaped top block 18; and in this embodiment, the upper side surface of the matching block 19 is located between the highest point and the lowest point of the bottom surface of the arc-shaped top block 18, so that when the matching block 19 moves from the needle head toward the fixed knife 1, it first contacts the bottom inclined surface or arc surface of the arc-shaped top block 18, so that under the action of the bottom surface of the arc-shaped top block 18, the matching block 19 moves downward in the third direction and then passes over the arc-shaped top block 18, and at this time, the movable knife will not be displaced to the right in the second direction. Preferably, the matching block 19 has a third arc-shaped fillet that matches the first arc-shaped fillet, and a fourth arc-shaped fillet that matches the second arc-shaped fillet. At the same time, as the movable knife 200 continues to retract, after the arc-shaped top block 18 is out of contact with the matching block 19, the movable knife 200 is subsequently moved upward along the third direction under the action of the fourth elastic component 12 to reset. In this embodiment, during the movement of the movable knife 200 from the needle head toward the fixed knife 1, after the arc-shaped top block 18 contacts the matching block 19, the movable knife 200 will not move toward the right side of the second direction, but will be moved downward to the third direction by the arc-shaped top block 18. The surface of the movable knife 200 is acted upon to move toward the third downward side, thereby avoiding the obstruction of the arc-shaped top block 18. Compared with using the needle tip to touch the movable knife 200 to make way, in the present embodiment, the arc-shaped top block 18 and the matching block 19 are used to touch the needle tip instead of the needle tip, thereby avoiding the impact load on the needle tip and solving the problem of the needle tip loosening after being impacted multiple times. It can be foreseen that in order to facilitate the movable knife to make way and the touching action between the arc-shaped top block 18 and the matching block 19, the surface of the matching block 19 that touches the arc-shaped top block 18 is chamfered, etc., which will not be elaborated in detail in the present embodiment.

[0097] In some embodiments of the present invention, the entire thread trimming device is arranged below the sewing machine table. At the same time, the first driving device 9 in this embodiment is installed on the body of the sewing machine. The first driving assembly 400 is slidably connected to the body of the sewing machine to ensure that the first driving assembly 400 can be stably driven to move by the first driving device 9. The bracket 300 has a shell component 302, and the shell component 302 has an opening structure on the side surfaces of the left side in the second direction and the upper side in the third direction. The movable knife 200 also has a main body component 202, and the main body component 20 2 is a shell structure, and the side surfaces of the main body part 202 on the right side in the second direction and the side surface on the third downward side are open structures respectively. A first slide post 203 is installed on the main body part 202 of the movable knife 200, and the first slide post 203 is slidably matched with a first slide groove 303 provided on the shell part 302 of the bracket 300 (the first slide groove 303 is a long groove extending along the second direction, and the first slide groove 303 can be a through groove penetrating the bottom surface of the shell part 302), and the first slide post 203 is used to limit the movable knife 200 in the fourth elastic part 12 The first slide post 203 preferably has a column body sliding in the first slide groove 303, and a baffle plate at the lower end of the column body disposed on the lower side of the shell part 302, and the baffle plate cannot pass through the first slide groove 303. Similarly, a second slide post 304 is installed on the shell part 302 of the bracket 300, and the second slide post 304 is slidably matched with the second slide groove 204 provided on the main body part 202 of the movable knife 200 (the second slide groove 204 is a long groove extending along the first direction, and the ... 4 may be a through slot penetrating the left side of the main body part 202, the second slide column 304 has a column body sliding in the second slide slot 204, and a baffle plate at the left end of the column body disposed on the left side of the main body part 202, the baffle plate cannot pass through the second slide slot 204), and the second slide column 304 is used to limit the movable knife 200 from escaping from the bracket 300 along the second direction under the action of the third elastic member 11. The structure in this embodiment can realize the giving way action of the movable knife 200, and the anti-misoperation protection program triggered after the needle presses the movable knife 200.

[0098] In some embodiments of the present invention, reference Fig.18The bracket 300 also includes a guide rod 305 installed in the shell part 302 and extending along the second direction. The guide rod 305 is slidably matched with the guide groove 401 opened on the first driving component 400. The first elastic component 5 is sleeved on the guide rod 305. One end of the first elastic component 5 acts on the side wall of the first driving component 400 and the other end acts on the boss 3051 set on the guide rod 305 of the bracket 300. In addition, the second driving component 600 and the third driving component 7 are coaxially arranged with the guide rod 305 and placed in the guide groove 401. The first driving component 400, the second driving component 600 and the third driving component 7 can slide relatively. A frame-shaped guide column 3052 is installed on the guide rod 305, and the limit block 301 is installed on the outside of the frame-shaped guide column 3052. The first elastic component 5 is placed between the guide rod 305 and the frame-shaped guide column 3052, and the second elastic component 8 is placed on the frame guide column 3 052 outside, the second driving component 600 is provided with an inner groove 601 (the inner groove 601 is provided with a sliding groove that slides with the frame-shaped guide column 3052). Through the structural setting in this embodiment, mutual interference between the first elastic component 5 and the second elastic component 8 can be avoided, and at the same time, it can be ensured that the second driving component 600 can stably drive the third driving component 7 to move on the frame-shaped guide column 3052 through the second elastic component 8. As a preferred embodiment, a guide rod 306 that cooperates with the guide rod 305 is also fixed to the front end of the shell component 302. A guide hole 403 consistent with the extension direction of the guide groove 401 is provided on the first driving component 400. The guide rod 306 slides in the guide hole 403 of the first driving component 400, and the guide rod 305 and the guide rod 306 play a role in guiding the stability of the bracket 300.

[0099] The right side wall of the first driving assembly 400 housing has a long sliding hole 402, which is connected to the guide groove 401 and extends along the first direction. The second driving assembly 600 has a cylinder 602, which is slidably sleeved on the guide rod 305 of the bracket 300, and has an inner groove 601. The cylinder 602 is connected to a driving plate 603, which is slidably fitted on the long sliding hole 402 on the right side wall of the first driving assembly 400, and the driving plate 603 is connected to the second driving device 10 on the part extending outside the housing of the first driving assembly 400, and the second driving device 10 drives the cylinder 602 to move along the first direction through the driving plate 603.

[0100] The industrial sewing machine thread trimming device described in the present application solves the problems of needle breakage and equipment damage caused by mechanical interference in continuous high-speed operation of traditional thread trimming devices by optimizing the relative position design of the fixed knife 1 and the movable knife 200 and introducing precise drive and elastic component coordination. At the same time, the present application adopts a hook structure 201 on the movable knife 200, and its outer design is arc-shaped, so that when the movable knife 200 contacts the needle, it can automatically generate a lateral giving way action (preferably, by setting the arc-shaped top block 18 and the matching block 19 to contact and cooperate, the movable knife 200 will be displaced to the right in the second direction, and the third elastic component 11 will be compressed, generating a giving way action for the needle), and during the resetting process, the upper thread 16 and the lower thread 17 are completely stored in the hook structure 201, forming a precise meshing with the fixed knife 1. The design utilizes the bracket 300 to move back and forth along the first direction, and combines the coordinated work of the first drive assembly 400, the second drive assembly 600 and the third drive assembly 7. The first elastic component 5 and the second elastic component 8 arranged between the drive assemblies realize effective buffering and adjustment of the reset of the movable knife 200 and the impact load of thread cutting, thereby ensuring that the movable knife 200 will not wear the fixed knife 1 due to excessive impact load caused by direct hard connection with the needle during the reset process, and can also prevent the needle from being broken due to mechanical interference with the movable knife 200 due to the needle not being completely detached. At the same time, a limit block 301, a fifth elastic component 14 and a pressure detection assembly 1300 are introduced between the bracket 300 and the drive assembly to realize precise control and real-time monitoring of the position of each moving component, ensuring that when any abnormal situation occurs, the protection program can be automatically started to stop the thread cutting operation to prevent misoperation. The industrial sewing machine thread trimming device described in the present application has a compact structure and a reasonable design. The components are driven by an electric telescopic rod to achieve synchronous, stable and efficient reciprocating motion, and the vibration and impact are minimized with the help of a multi-stage elastic buffer device, which not only improves the thread trimming accuracy and cutting quality, but also significantly extends the service life of key components such as the fixed knife 1 and the movable knife 200, while reducing the maintenance cost and failure risk caused by mechanical impact, so that the industrial sewing machine can perform safe, reliable, efficient and economical thread trimming operations under conditions of large-scale production and high-speed continuous operation.

[0101] The present invention also provides a control method for the above-mentioned thread trimming device of the industrial sewing machine, comprising the following steps:

[0102] Step 1: Sending a thread trimming instruction to the control host. It can be foreseen that when the thread trimming operation is not performed, the first drive assembly 400 and the second drive assembly 600 are both in an initial retracted state. After the sewing of the fabric is completed, the thread trimming operation begins;

[0103] Step 2: The first driving device 9 and the second driving device 10 act simultaneously, respectively driving the first driving assembly 400 and the second driving assembly 600 to move to the extreme position. Under the cooperation of the arc-shaped top block 18 and the matching block 19, the movable knife 200 compresses the third elastic component 11 to make way for the movable knife 200, and the thread puller on the rotary shuttle separates the upper thread 16. When the movable knife 200 is at the extreme position, the needle is located inside the hook structure 201 of the movable knife 200. After the rotary shuttle releases the upper thread 16, the upper thread 16 is hooked on the hook structure 201 of the movable knife 200.

[0104] Step 3: The first driving device 9 is activated first to drive the movable knife 200 to retract. After the first driving device 9 retracts one end distance, the second driving device 10 is activated, and the first driving device 9 and the second driving device 10 are retracted to the initial position at the same time, and the movable knife 200 and the fixed knife 1 complete the thread cutting operation;

[0105] It should be understood that the first drive device 9 is actuated first to drive the movable knife 200 to retract. During this process, if the needle has not moved out of the moving range of the movable knife 200, the second elastic component 8 will be compressed to prevent the needle from being broken. In the event that the movable knife 200 is blocked by the needle, not driving the second drive device 10 first can ensure that the relative distance between the second drive assembly 600 and the first drive interval does not change. After the needle no longer blocks the movable knife 200, the bracket 300 will retract toward the first drive assembly 400 under the action of the second elastic component 8. During the retraction process, the first elastic component 5 acts as a buffer to prevent the bottom line 17 and the surface line 16 from slipping.

[0106] In this embodiment, it also includes an anti-misoperation protection mode. During step 2 and step 3, after the installed pressure detection component 1300 detects that the pressure exceeds the set threshold, the control host receives a signal to start the shutdown, interrupts the movement of the needle and the shuttle, and stops executing steps 2 and 3. After resetting the needle, the control host continues to execute step 2 or step 3, which prevents the needle from pressing the knife 200 and breaking it.

[0107] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A thread trimming device for an industrial sewing machine, characterized in that: include: Fixed knife (1); A movable knife (200) cooperates with the fixed knife (1) to complete thread cutting, and the movable knife (200) has a hook-shaped structure (201) for hooking the thread; A bracket (300) for mounting a movable knife (200), the bracket (300) sliding along a first direction of the fixed knife (1), the bracket (300) being spaced apart from the fixed knife (1) along the right side of a second direction of the fixed knife (1), the first direction and the second direction being perpendicular to each other, and the movable knife (200) being capable of reciprocatingly sliding relative to the bracket (300) along the second direction; A first driving assembly (400) for installing a bracket (300), a first elastic component (5) acting between the first driving assembly (400) and the bracket (300), and the first elastic component (5) applies a force to the bracket (300) to move away from the first driving assembly (400), a second driving assembly (600) and a third driving assembly (7) are slidably installed in the first driving assembly (400), a second elastic component (8) acting between the second driving assembly (600) and the third driving assembly (7), and the third driving assembly (7) is acted upon by the second elastic component (8) to drive the bracket (300) to move closer to the first driving assembly (400); A first driving device (9) for driving the first driving component (400) to reciprocate in a first direction; A second drive device (10) is used for driving a second drive component (600) to reciprocate in a first direction relative to a first drive component (400).

2. The thread trimming device for an industrial sewing machine according to claim 1, characterized in that: The movable knife (200) can move relative to the bracket (300) along a third direction, and the third direction is perpendicular to the first direction and the second direction respectively.

3. The thread trimming device for an industrial sewing machine according to claim 2, characterized in that: A third elastic component (11) is provided between the movable knife (200) and the bracket (300), and the third elastic component (11) applies a force acting along a second direction to the movable knife (200).

4. The thread trimming device for an industrial sewing machine according to claim 3, characterized in that: A fourth elastic component (12) is provided between the movable knife (200) and the bracket (300), and the fourth elastic component (12) applies a force acting along a third direction to the movable knife (200). A pressure detection component (1300) is installed between the bracket (300) and the movable knife (200), and the distance that the movable knife (200) moves along the second direction is greater than the distance that the movable knife (200) moves along the third direction.

5. The thread trimming device for an industrial sewing machine according to claim 3, characterized in that: The outer portion of the hook-shaped structure (201) on the movable knife (200) is arc-shaped, and the inner portion of the hook-shaped structure (201) of the movable knife (200) cooperates with the fixed knife (1) to complete thread cutting.

6. The thread trimming device for an industrial sewing machine according to claim 4, characterized in that: The pressure detection component (1300) comprises an elastic airbag (1301) installed between the support (300) and the movable knife (200), and the elastic airbag (1301) is connected to a pressure sensor installed on the first driving component (400) through an air pipe.

7. The thread trimming device for an industrial sewing machine according to claim 1, characterized in that: A fifth elastic component (14) is provided between the second drive component (600) and the first drive component (400), and the fifth elastic component (14) is used to buffer the force applied when the second drive device (10) drives the second drive component (400) to move.

8. The thread trimming device for an industrial sewing machine according to claim 1, characterized in that: The limit elastic force of the first elastic component (5) is smaller than the limit elastic force of the second elastic component (8).

9. The thread trimming device for an industrial sewing machine according to claim 8, characterized in that: A limit block (301) is installed on the bracket (300), and the limit block (301) is restricted to move between the first drive assembly (400) and the third drive assembly (7).

10. A control method for a thread trimmer of an industrial sewing machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Send a wire trimming command to the control host; Step 2: The first drive device (9) and the second drive device (10) are operated simultaneously, respectively driving the first drive assembly (400) and the second drive assembly (600) to move, thereby driving the movable knife (200) to approach the fixed knife (1). At the same time, the control host drives the needle and the rotary shuttle of the sewing machine to move. The movable knife (200) makes way when approaching the needle. The thread divider on the rotary shuttle divides the upper thread. When the movable knife (200) moves to a set position, the needle is located inside the hook structure (201) of the movable knife (200). Then, after the rotary shuttle releases the upper thread, the upper thread is hooked on the hook structure (201) of the movable knife (200). Step 3: The first driving device (9) first operates to drive the movable knife (200) to retract. After the first driving device (9) retracts a certain distance, the second driving device (10) operates, and the first driving device (9) and the second driving device (10) simultaneously retract to the initial position, and the movable knife (200) and the fixed knife (1) complete the thread cutting operation; It also includes an anti-misoperation protection mode. During step 2 and step 3, after the installed pressure detection component detects that the pressure exceeds the set threshold, the control host receives a signal to start the shutdown, interrupting the movement of the needle and the shuttle and stopping the execution of steps 2 and 3. After resetting the needle, the control host continues to execute step 2 or step 3.

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