Thread trimming device for industrial sewing machine and control method thereof

Abstract

The application particularly relates to a thread trimming device of an industrial sewing machine and a control method thereof, the thread trimming device comprising a fixed blade and a movable blade, the movable blade is installed on a support and can slide, the thread trimming device hooks the top thread and the bottom thread to the fixed blade to complete the thread trimming operation, in the process, the movable blade is provided with a hook-shaped structure to place the needle in the hook-shaped structure on the movable blade, so that the top thread is sleeved on the hook-shaped structure of the movable blade, and the driving assembly is arranged to drive the movable blade to contact the fixed blade to complete the thread trimming, wherein the movable blade has a buffer margin in the retraction process, so that the needle is prevented from being broken, a misoperation protection mode is arranged, the needle, the rotating shuttle and the movable blade are stopped in time when the needle presses the movable blade, the action of the needle is interrupted, the needle is protected from being broken, in addition, the elastic component is arranged to buffer the impact load when the movable blade contacts the fixed blade, and the support is further subjected to the action, so that the reliability of the thread trimming operation is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewing machines, and particularly relates to a thread trimming device of an industrial sewing machine and a control method thereof. BACKGROUND

[0002] In the existing sewing equipment, the thread trimming device mainly realizes the synchronous cutting of the top thread and the bottom thread through the meshing movement of the fixed knife and the movable knife. According to the technical solution disclosed in Chinese invention patent CN221971841U, the fixed knife and the movable knife are arranged above the rotating shuttle and below the needle. The working principle is that the movable knife is displaced towards the fixed knife by a driving mechanism, and the double-thread cutting is completed by the shearing action between the two blade edges, and then the movable knife is reset by a torsional spring mechanism. However, this technical solution has significant technical defects in actual application: during the thread trimming process, the fiber debris (hereinafter referred to as "thread fluff") of the top thread and the bottom thread inevitably adheres to the working surface of the knife. After long-term operation, the continuous accumulation of thread fluff will cause the following technical problems: first, excessive thread fluff will significantly increase the friction coefficient between the movable knife and the fixed knife, causing the driving torque of the torsional spring to be insufficient to overcome the friction resistance, resulting in the failure of the movable knife to reset, and further causing mechanical interference between the needle and the stationary movable knife when the needle is descending, and ultimately leading to the breakage of the knife; second, the fiber layer formed by the accumulation of thread fluff changes the gap parameters between the knives, causing the fixed knife to bear abnormal impact load and accelerating the wear process of the knife, thereby significantly reducing the service life of the device. SUMMARY

[0003] The purpose of the present application is to at least solve the problem that the movable knife and the fixed knife of the existing thread trimming device of a sewing machine easily adhere to thread fluff, causing the fixed knife to bear a large impact and the clamp to wear, and the excessive thread fluff causing the movable knife to fail to reset. This purpose is achieved by the following technical solution:

[0004] The first aspect of the present application proposes an industrial sewing machine thread trimming device, comprising:

[0005] a fixed knife;

[0006] a movable knife cooperating with the fixed knife to complete thread trimming, the movable knife having a hook-shaped structure for hooking thread, the movable knife having a yielding action for placing the needle head inside the hook-shaped structure (201) on the movable knife;

[0007] a bracket for mounting the movable knife, the bracket sliding along a first direction of the fixed knife, the bracket being spaced apart from the fixed knife on the right side along a second direction of the fixed knife, the first direction and the second direction being perpendicular to each other, and the movable knife being capable of sliding along the second direction relative to the bracket;

[0008] A first driving assembly for mounting a support, a first elastic component acting between the first driving assembly and the support, and the first elastic component applying a force to the support away from the first driving assembly, a second driving assembly and a third driving assembly respectively slidingly mounted in the first driving assembly, a second elastic component acting between the second driving assembly and the third driving assembly, and the third driving assembly being acted by the second elastic component for driving the support to approach the first driving assembly;

[0009] A first driving device for driving the first driving assembly to reciprocate in a first direction;

[0010] A second driving device for driving the second driving assembly to reciprocate in the first direction relative to the first driving assembly.

[0011] In some embodiments, the moving knife is capable of moving in a third direction relative to the support, the third direction being perpendicular to the first direction and the second direction respectively.

[0012] In some embodiments, a third elastic component is arranged between the moving knife and the support, the third elastic component applying a force to the moving knife in the second direction.

[0013] In some embodiments, a fourth elastic component is arranged between the moving knife and the support, the fourth elastic component applying a force to the moving knife in the third direction, a pressure detection assembly being mounted between the support and the moving knife, the distance of the moving knife moving in the second direction being greater than the distance of the moving knife moving in the third direction.

[0014] In some embodiments, the hook-shaped structure on the moving knife is arc-shaped on the outside, and the inside of the hook-shaped structure of the moving knife cooperates with the fixed knife to complete the line shearing.

[0015] In some embodiments, the pressure detection assembly comprises an elastic air bag mounted between the support and the moving knife, and the elastic air bag is connected with a pressure sensor mounted on the first driving assembly through an air pipe.

[0016] In some embodiments, a fifth elastic component is arranged between the second driving assembly and the first driving assembly, the fifth elastic component being used for buffering the force when the second driving device drives the second driving assembly to move.

[0017] In some embodiments, the limit elastic force of the first elastic component is less than the limit elastic force of the second elastic component.

[0018] In some embodiments, a limiting block is mounted on the support, and the limiting block is limited to move between the first driving assembly and the third driving assembly.

[0019] The application also provides a control method of the thread trimming device of the industrial sewing machine.

[0020] Step 1: sending a thread trimming instruction to the control host;

[0021] Step 2: the first driving device and the second driving device act simultaneously to drive the first driving assembly and the second driving assembly to move respectively, and drive the moving knife to approach the fixed knife, at the same time, the control host drives the needle and the rotating hook to act, so that the moving knife contacts the needle, the moving knife is pressed by the needle to pass through the compression of the third elastic component to generate a displacement action, the thread distributor on the rotating hook divides the thread, when the moving knife moves to the set position, the needle is located in the hook structure of the moving knife, and then the thread is hooked on the hook structure of the moving knife after the rotating hook releases the thread;

[0022] Step 3: the first driving device acts to drive the moving knife to retract, after the first driving device retracts by a distance, the second driving device acts, the first driving device and the second driving device retract to the initial position simultaneously, and the moving knife and the fixed knife complete the thread trimming operation;

[0023] The method also includes a misoperation protection mode, during the processes of Step 2 and Step 3, when the pressure detection component detects that the pressure exceeds the set threshold value, the control host receives the signal to start stopping, interrupts the actions of the needle and the rotating hook, and stops executing Step 2 and Step 3, after resetting the needle, the control host continues to execute Step 2 or Step 3.

[0024] The thread trimming device of the sewing machine includes a fixed knife and a moving knife, the moving knife is installed on a support and can slide, the thread and the bottom thread are hooked to the fixed knife to complete the thread trimming operation, in the process, the needle is placed in the hook structure of the moving knife by the displacement action of the moving knife, the thread is hooked on the hook structure of the moving knife, and the thread trimming is completed by driving the moving knife to contact the fixed knife through the driving assembly, the moving knife has a buffer margin in the retraction process, which can avoid breaking the needle, the misoperation protection mode is provided, which can ensure timely stopping when the needle presses the moving knife, interrupt the actions of the needle, the rotating hook and the moving knife, and protect the needle from being broken, in addition, the elastic component is provided to buffer the impact load when the moving knife contacts the fixed knife, and the support can be further improved by increasing the action, thereby improving the reliability of the thread trimming operation. The fixed knife is moved to the side of the rotating hook, the thread end is separated from the direction away from the core area of the rotating hook during thread trimming, which fundamentally avoids the thread retention problem caused by the traditional thread trimming above the rotating hook, and significantly reduces the risk of rotating hook jamming. At the same time, the fixed knife needs to pull the thread and the bottom thread to one side of the rotating hook, which increases the stroke of the moving knife, avoids the problem that the thread end is too short after thread trimming, and causes the thread end to fall off or fail to normally start sewing, and the bottom thread end to retract into the rotating hook. BRIEF DESCRIPTION OF DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not intended to limit the scope of the application. Moreover, in the drawings, like reference numerals refer to similar components throughout the several views. In the drawings:

[0026] Figure 1 is a front view of a thread trimming device according to an embodiment of the present application;

[0027] Figure 2 is Figure 1 a schematic view of the thread trimming device shown in FIG. 1, viewed from another angle;

[0028] Figure 3 is Figure 1 a schematic view of the thread trimming device shown in FIG. 1;

[0029] Figure 4 is Figure 3 a schematic view of the thread trimming device shown in FIG. 1, viewed from another angle;

[0030] Figure 5 is Figure 3 a schematic view of the thread trimming device shown in FIG. 1, with the first drive assembly sectioned; Figure 1 ;

[0031] Figure 6 is Figure 3 a schematic view of the thread trimming device shown in FIG. 1, with the first drive assembly sectioned; Figure 2 ;

[0032] Figure 7 is Figure 5 a schematic view of the thread trimming device shown in FIG. 1, with the first drive assembly and the fixed knife hidden; Figure 1 ;

[0033] Figure 8 is Figure 5 a schematic view of the thread trimming device shown in FIG. 1, with the first drive assembly and the fixed knife hidden; Figure 2 ;

[0034] Figure 9 is Figure 7 a schematic view of the thread trimming device shown in FIG. 1, with the second drive assembly and the fifth resilient member hidden;

[0035] Figure 10 is Figure 9 a schematic view of the thread trimming device shown in FIG. 1, with the second drive assembly and the fifth resilient member hidden;

[0036] Figure 11 is Figure 7 a schematic view of the thread trimming device shown in FIG. 1, with the second drive assembly and the fifth resilient member hidden;

[0037] Figure 12 is a structural schematic diagram of a cutting thread device according to another embodiment of the present application;

[0038] Figure 13 is Figure 12 is a partial schematic diagram of the cutting thread device shown in

[0039] Figure 14 is Figure 12 is a structural schematic diagram of an arc-shaped top block of the cutting thread device shown in

[0040] Figure 15 is Figure 13 is a structural schematic diagram of a matching block of the cutting thread device shown in

[0041] Figure 16 is Figure 12 is a schematic diagram of the matching block of the embodiment shown contacting the arc-shaped top block when the matching block moves toward the needle direction from the fixed knife direction;

[0042] Figure 17 is Figure 12 is a schematic diagram of the matching block of the embodiment shown contacting the arc-shaped top block when the matching block moves toward the needle direction from the fixed knife direction;

[0043] Figure 18 is a structural schematic diagram of a first driving assembly and a second driving assembly (the first driving assembly is transparently processed).

[0044] The various marks in the drawings represent the following:

[0045] 1, fixed knife;

[0046] 200, moving knife; 201, hook-shaped structure; 202, main body part; 203, first sliding column; 204, second sliding slot;

[0047] 300, support; 301, limiting block; 302, housing part; 303, first sliding slot; 304, second sliding column; 305, guide rod; 3051, boss; 3052, frame-shaped guide column; 306, guide rod;

[0048] 400, first driving assembly; 401, guide slot; 402, long sliding hole; 403, guide rod;

[0049] 5, first elastic part;

[0050] 600, second driving assembly; 601, inner slot; 602, cylinder; 603, driving plate;

[0051] 7, third driving assembly;

[0052] 8, second elastic part;

[0053] 9, first driving device;

[0054] 10. Second driving device;

[0055] 11. Third elastic component;

[0056] 12. Fourth elastic component;

[0057] 1300. Pressure detecting assembly; 1301. Elastic air bag;

[0058] 14. Fifth elastic component;

[0059] 15. Rotating hook;

[0060] 16. Face thread;

[0061] 17. Bottom thread;

[0062] 18. Arc-shaped top block;

[0063] 19. Cooperating block. DETAILED DESCRIPTION

[0064] Example embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0065] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0066] Although the terms first, second, third, etc. can be used herein to describe various 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 be only used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms when used in the singular or plural herein do not imply a sequence or order unless the context clearly indicates otherwise. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0067] For ease of description, spatial relative terms can be used herein to describe the relationship of one element or feature to another element or feature as shown in the drawings, such as "inner", "outer", "inward", "outward", "lower", "down", "upper", "up", and the like. 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 drawings. For example, if the device in the drawings is turned over, an element described as "below" or "under" another element or feature would then be oriented "above" or "over" the other element or feature. Thus, the example term "below" can include both an up and a down orientation.

[0068] Reference Figures 1-11 In terms of overall design, the embodiment of the present application provides an industrial sewing machine thread cutting device, which comprises a fixed knife 1 located on one side of the rotating hook along a first direction. The embodiment provided by the present application is that the fixed knife 1 is located on the front side of the rotating hook along the first direction, and a movable knife 200 cooperates with the fixed knife 1 to complete thread cutting. Referring to Figure 2 The schematic diagram shows a state of the movable knife 200 during thread cutting operation. It needs to be understood that, considering that the existing thread cutting device is arranged directly above the rotating hook of the sewing machine and will interfere with the needle to break when not reset, and thread cutting directly above the rotating hook will also cause the accumulation of lint on the rotating hook, which will interfere with the operation of the rotating hook, the fixed knife 1 in the embodiment is no longer arranged directly above the rotating hook, and the movable knife 200 needs to drive the bobbin thread 17 and the top thread 16 to approach the fixed knife 1 to complete the thread cutting operation, thereby avoiding the accumulation of lint on the rotating hook. The movable knife 200 has a hook-shaped structure 201 for hooking the thread. In order to enable the movable knife 200 to hook the top thread 16 and the bobbin thread 17, a bracket 300 for mounting the movable knife 200 is further included. The bracket 300 can reciprocate along a first direction of the fixed knife 1. The bracket 300 is arranged to be spaced apart from the fixed knife 1 on the right side of the fixed knife 1 along a second direction. The first direction and the second direction are perpendicular to each other, and the movable knife 200 can reciprocate along the second direction relative to the bracket 300.

[0069] To ensure the movement of the moving knife 200, a first driving assembly 400 for mounting the support 300 is further included, a first elastic component 5 is arranged between the first driving assembly 400 and the support 300, and the first elastic component 5 applies a force to the support 300 away from the first driving assembly 400, a second driving assembly 600 and a third driving assembly 7 are respectively arranged in the first driving assembly 400 and reciprocally slide in the first direction, a second elastic component 8 is arranged between the second driving assembly 600 and the third driving assembly 7, and the second driving assembly 600 can drive the third driving assembly 7 to move in the first direction through the second elastic component 8, the third driving assembly 7 applies a force to the support 300, so that the support 300 is subjected to a force close to the first driving assembly 400 in the first direction, a first driving device 9 for driving the first driving assembly 400 to reciprocally move in the first direction is further included, a second driving device 10 is arranged on the first driving assembly 400, and the second driving device 10 is used to drive the second driving assembly 600 to reciprocally move in the first direction relative to the first driving assembly 400, that is, in the embodiment, the moving knife 200 can be driven by the first driving device 9 and the second driving device 10 to hook the face thread 16 and the bottom thread 17, and the cutting of the face thread 16 and the bottom thread 17 is completed through the cooperation between the fixed knife 1 and the moving knife 200.

[0070] It should be understood that the first direction of the fixed knife 1 satisfies that the support 300 drives the moving knife 200 to close to the face thread 16 and the bottom thread 17, the first direction is perpendicular to the second direction, the parallel movement of the moving knife 200 relative to the fixed knife 1 is ensured, and thus the cooperation between the moving knife 200 and the fixed knife 1 completes the thread cutting operation.

[0071] It should be understood that the operation of the existing sewing machine is roughly as follows: the position of the bottom thread 17 does not change, the face thread 16 is arranged on the needle and needs to be driven by the needle to pass through the cloth, then the thread separator on the rotating hook separates the face thread 16, the face thread 16 is released and lifted to cover the bottom thread 17 through the reset of the needle, and thus one sewing operation is completed.

[0072] To ensure that the face thread 16 can be hooked by the moving knife 200, in the embodiment, it is necessary to ensure that the needle has passed through the cloth and the thread separator separates the face thread 16, at this time, the hook-shaped structure 201 on the moving knife 200 is located at the needle, so that after the face thread 16 is loosened by the thread separator, the face thread 16 is blocked by the hook-shaped structure 201 on the moving knife 200 as the needle resets, and then the moving knife 200 can hook the bottom thread 17 and the face thread 16 to move to the fixed knife 1, therefore, in the embodiment, the moving knife 200 can slide relative to the support 300 in the second direction, that is, the moving knife 200 needs to make a yielding action to avoid the blockage of the needle when close to the needle, and the needle is located inside the hook-shaped structure 201 after reset.

[0073] The industrial sewing machine thread trimming device disclosed in the present application avoids the problems of thread pile-up and needle interference caused by the traditional thread trimming device in which the fixed knife 1 is located directly above the rotating hook 15, by arranging the fixed knife 1 on the front side of the rotating hook 15 in the first direction. The fixed knife 1 and the moving knife 200 form the core matching unit of the thread trimming operation. The moving knife 200 is provided with a hook-shaped structure 201 for stably hooking the face thread 16 and the bottom thread 17. The moving knife 200 is slid along the fixed knife 1 in the first direction to realize the parallel and synchronous movement between the moving knife 200 and the fixed knife 1. The bracket 300 is arranged at a reasonable interval with the fixed knife 1 in the second direction, so that the moving knife 200 can automatically produce a right-of-way action in the second direction relative to the bracket 300 when it is close to the needle to avoid direct collision with the needle. After the needle passes through the fabric and distributes the face thread 16 through the thread distributor, it is ensured that the face thread 16 can be hooked by the moving knife 200. At the same time, the first driving assembly 400 cooperates with the second driving assembly 600 and the third driving assembly 7 arranged between the first driving assembly 400 and the bracket 300, and the first elastic component 5 and the second elastic component 8 arranged therebetween, to realize the accurate reciprocating movement of the bracket 300 and the moving knife 200 in the first direction under the driving of the first driving device 9 and the second driving device 10, and to provide sufficient buffer margin during the resetting of the moving knife 200 to prevent mechanical interference caused by the needle not fully exiting the movement range of the moving knife 200. The industrial sewing machine thread trimming device disclosed in the present application significantly improves the stability and safety of the thread trimming operation by optimizing the arrangement position of the fixed knife 1 and the cooperative movement design of the hook-shaped structure on the moving knife 200 and the bracket 300. It effectively avoids the thread trimming errors and equipment damage risks caused by thread pile-up and needle interference in the traditional thread trimming device. At the same time, it realizes the synchronous and accurate guidance of the face thread 16 and the bottom thread 17 during the trimming process, ensures that the cut thread can be accurately guided to the subsequent sewing process and maintains a stable state. The balance and regulation between the driving assemblies and the elastic components in continuous high-speed operation provide 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 on thread trimming precision, speed and stability.

[0074] In some embodiments of the present application, the hook-shaped structure 201 of the moving knife 200 is arc-shaped, which facilitates the moving knife 200 to slide in the second direction to the right relative to the bracket 300 after contacting the needle, thereby automatically realizing the right-of-way action to avoid direct interference with the needle. After the hook-shaped structure 201 on the moving knife 200 is disengaged from the needle, the moving knife 200 is reset. At this time, the bottom thread 17 and the face thread 16 are both located inside the hook-shaped structure 201 of the moving knife 200, ensuring that the wire remains in a stable and controlled state before being cut. After the moving knife 200 and the fixed knife 1 are close, the inside of the hook-shaped structure 201 of the moving knife 200 cooperates with the fixed knife 1 to complete the thread trimming.

[0075] In some embodiments of the present application, in order to ensure that the moving knife 200 can be reset after generating the action of sliding in the second direction right relative to the support 300 due to the blocking of the needle by the arc-shaped outer structure, and to ensure that the needle is located inside the hook-shaped structure 201 of the moving knife 200, a third elastic component 11 is arranged between the moving knife 200 and the support 300, which applies a force acting in the second direction to the moving knife 200. After the moving knife 200 is contacted by the needle, the third elastic component 11 will be compressed, and then after the moving knife 200 continues to move to be not in contact with the needle, the moving knife 200 will be reset by the third elastic component 11, and the needle will be placed inside the hook-shaped structure 201 of the moving knife 200. Specifically, the third elastic component 11 can be a spring. In this embodiment, by the arc-shaped structure of the hook-shaped structure 201 on the moving knife 200, the automatic yielding action is realized during the cutting operation of the moving knife 200 by the contact with the needle, which can ensure the accuracy of the position of the moving knife 200 staying at the needle, and the shuttle 15 can hook the surface thread 16 after the moving knife 200 releases the surface thread 16. By optimizing the hook-shaped structure 201 on the moving knife 200 and setting its outer part as an arc shape, the moving knife 200 can automatically slide laterally under the blocking action of the needle during the cutting process by using its arc-shaped outer profile, and after yielding, it can ensure that the bottom thread 17 and the surface thread 16 are completely stored inside the hook-shaped structure 201 and form precise engagement with the fixed knife 1 during the resetting process, thereby realizing stable and synchronous cutting of the wire material, effectively avoiding the equipment wear and needle damage risk caused by direct contact between the needle and the knife in the traditional cutting device, and significantly improving the safety, reliability and overall operation stability of the cutting operation.

[0076] It needs to be understood that when the moving knife 200 is reset to approach the fixed knife 1, there can be a needle that has been lifted but not left the range of movement of the moving knife 200. In order to avoid mechanical interference between the moving knife 200 and the needle during the reset process, causing the needle to break, in the present embodiment, the first driving assembly 400 and the bracket 300 are acted on by the first elastic component 5, and the first elastic component 5 applies a force to the bracket 300 away from the first driving assembly 400 along the rear side of the first direction, that is, under the action of the first elastic component 5, the bracket 300 will drive the moving knife 200 to move along the rear side of the first direction. In order to ensure that the bracket 300 will not directly separate from the first driving assembly 400 under the action of the first elastic component 5, the bracket 300 needs to be limited, and in the present example, the second driving assembly 600 and the third driving assembly 7 are respectively slidably installed in the first driving assembly 400, the second driving assembly 600 and the third driving assembly 7 are acted on by the second elastic component 8, and the second driving assembly 600 drives the third driving assembly 7 to move forward along the first direction through the action of the second elastic component 8, the third driving assembly 7 applies a force to the bracket 300 to move the bracket 300 in the direction of approaching the first driving assembly 400 along the first direction, that is, the third driving assembly 7 limits the bracket 300, and the elastic forces of the second elastic component 8 and the first elastic component 5 cancel each other out, constituting that in the idle state of the bracket 300, the second elastic component 8 limits the distance of the bracket 300 away from the first driving assembly 400.

[0077] In some embodiments of the present application, the bracket 300 is fixed with a limiting block 301 placed in the first driving assembly 400, the limiting block 301 is placed in the direction away from the moving knife 200 of the third driving assembly 7, and the limiting block 301 is in abutment with the third driving assembly 7. In the present embodiment, the second driving assembly 600 is driven by the external second driving device 10 to provide driving force to drive the second driving assembly 600 to reciprocate in the first direction, that is, the movement of the second driving assembly 600 is not controlled by the second elastic component 8, but is controlled by the external second driving device 10. Therefore, under the action of the second elastic component 8, the third driving assembly 7 will have a tendency to move forward in the first direction (i.e., move away from the second driving assembly 600), and at the same time, because the bracket 300 is acted on by the first elastic component 5, it will have a tendency to move backward in the first direction (i.e., move close to the second driving assembly 600). The third driving assembly 7 will always be in contact with the limiting block 301, that is, the bracket 300 will be simultaneously acted on by the first elastic component 5 and the second elastic component 8, and under the balance of the forces between the first elastic component 5 and the second elastic component 8, the distance of the bracket 300 away from the first driving assembly 400 is determined. Therefore, when the moving knife 200 is at the needle position, under the action of the first elastic component 5 and the second elastic component 8, during the resetting process of the moving knife 200, if the needle has not been lifted to move away from the moving range of the moving knife 200, the moving knife 200 will be blocked by the needle at this time. When the first driving assembly 400 moves back, the moving knife 200 will not move back together with the bracket 300. And when the second driving assembly 600 needs to reset the moving knife 200, it also needs to move forward in the first direction. When the second driving assembly 600 moves forward in the first direction, it will not directly contact the third driving assembly 7, but will compress the second elastic component 8, thereby giving the moving knife 200 a certain distance of buffer allowance, ensuring that the needle can completely move out of the moving range of the moving knife 200, and avoiding the problem of the needle being broken by the moving knife 200.

[0078] In some embodiments of the present application, the first elastic component 5 and the second elastic component 8 can adopt springs.

[0079] The industrial sewing machine thread cutting device described in the present application effectively prevents the mechanical interference and needle breaking problem caused by the needle not being completely separated during the resetting process of the moving 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 driving assembly 7 and the limiting block 301, and the active driving action of the second driving assembly 600. The moving knife 200 can maintain a stable relative position when blocked by the needle, and gradually realize buffer retraction under the action of the external driving device, ensuring that the needle is always covered by the hook-shaped structure of the moving knife 200 after resetting, so that the top thread 16 and the bottom thread 17 always maintain a stable and controlled state before being cut.

[0080] It needs to be understood that in the embodiment, the moving knife 200 not only needs to have a buffer margin to ensure that the needle is not broken when it is reset, but also needs to have a buffer when the moving knife 200 and the fixed knife 1 cooperate to complete the thread cutting operation, so as to avoid the problem that the impact load of the moving knife 200 on the fixed knife 1 is too large when the moving knife 200 is directly connected, causing the fixed knife 1 to be worn and the service life to be reduced.

[0081] Specifically, the first driving assembly 400 is driven by the first driving device 9 to reciprocate in the first direction, the second driving device 10 is installed on the first driving assembly 400, and the second driving assembly 600 is driven by the second driving device 10 to be able to reciprocate in the first direction relative to the first driving assembly 400. It needs to be understood that when the first driving assembly 400 moves, the second driving assembly 600 will move synchronously with the first driving assembly 400. According to the foregoing, in the embodiment, the bracket 300 is simultaneously acted on by the first elastic member 5 and the second elastic member 8, and the second elastic member 8 acts between the second driving assembly 600 and the third driving assembly 7. The front side of the third driving assembly 7 in the first direction is in contact with the limiting block 301 installed on the bracket 300, so that the sliding of the second driving assembly 600 will cause the distance between the second driving assembly 600 and the third driving assembly 7 to change, thereby changing the force exerted by the second elastic member 8 on the third driving assembly 7. The third driving assembly 7 exerts a force on the limiting block 301 on the bracket 300, thereby affecting the movement of the bracket 300. Therefore, in the embodiment, the movement of the bracket 300 relative to the first driving assembly 400 is driven by the second driving assembly 600, that is, when the moving knife 200 and the fixed knife 1 perform the thread cutting operation, the first driving assembly 400 and the second driving assembly 600 need to be retracted to the initial state. At the same time, during the retraction of the second driving assembly 600, the second elastic member 8 will be compressed, and the moving knife 200 will contact the fixed knife 1 to complete the thread cutting under the action of the second elastic member 8. It can be predicted that the force exerted by the second elastic member 8 on the moving knife 200 can be adjusted by the sliding of the second driving assembly 600, thereby adjusting the impact load when the moving knife 200 contacts the fixed knife 1. The second elastic member 8 can also play a role in buffering the impact load, and the force of the second elastic member 8 can be increased by the continuous movement of the second driving assembly 600, thereby improving the reliability of the thread cutting operation.

[0082] In some embodiments of the application, the moving knife 200 and the fixed knife 1 cut the bottom thread 17 and the top thread 16 by shear force. Alternatively, the moving knife 200 and the fixed knife 1 cut the bottom thread 17 and the top thread 16 by extruding and rubbing the top thread 16 and the bottom thread 17.

[0083] The thread cutting device of the industrial sewing machine has the advantages that through the accurate cooperation between the first driving device 9, the second driving device 10 and the elastic components, the risk of needle breakage caused by mechanical interference between the moving cutter 200 and the needle during the resetting process is effectively prevented, the impact load between the moving cutter 200 and the fixed cutter 1 is adjusted through the second elastic component 8, the stable and controlled state of the bottom thread 17 and the top thread 16 before being cut is ensured in the thread cutting operation, whether the shearing force or the extrusion friction mode is adopted, the thread cutting precision and the service life of the equipment are greatly improved, and the equipment wear and maintenance cost caused by mechanical impact are significantly reduced under the condition of high-speed continuous operation.

[0084] In some embodiments of the application, the maximum elasticity of the first elastic component 5 is less than the maximum elasticity of the second elastic component 8, which ensures that the movement of the second driving assembly 600 can reliably drive the bracket 300 to move.

[0085] In some embodiments of the application, the fifth elastic component 14 is arranged between the second driving assembly 600 and the first driving assembly 400, which can be a spring and plays a role in increasing the stability of the second driving assembly 600 when it is driven by the second driving device 10.

[0086] In some embodiments of the application, the first driving device 9 and the second driving device 10 are both electric telescopic rods, which have the advantages of convenient control and high reliability.

[0087] The arrangement not only effectively buffers the impact load between the moving cutter 200 and the fixed cutter 1 during the thread cutting process, prevents equipment wear and needle damage caused by direct hard connection, but also ensures that the bracket 300 can reliably displace through the second driving assembly 600 driven by the first driving assembly 400, realizes the precise engagement between the moving cutter 200 and the fixed cutter 1 during the shearing process, and keeps the thread cutting operation at a high precision and consistency through the coordinated adjustment between the driving assemblies and the elastic components.

[0088] It should be noted that in this embodiment, there may also be a misoperation problem, that is, after the moving cutter 200 moves to the position of the needle, the needle is lifted and then misoperated to continue the sewing operation, at this time, if the descent of the needle is not stopped, the problem of needle breakage may still occur, and the embodiment also provides a protection program to prevent misoperation.

[0089] Specifically, the moving knife 200 can reciprocate relative to the support 300 along a third direction, the third direction being perpendicular to the first direction and the second direction respectively, that is, the moving knife 200 can move in the same direction as the needle, so that when the needle presses the moving knife 200, the moving knife 200 can move with the needle to give the needle a buffer and avoid the needle from breaking after a violent impact with the moving knife.

[0090] In some embodiments of the application, a fourth elastic component 12 is arranged between the moving knife 200 and the support 300, which can be a spring. The fourth elastic component 12 applies a force to the moving knife 200 in the third direction upward to ensure the reset of the moving knife 200. During the actual operation of the moving knife 200, the fourth elastic component 12 can move with the moving knife 200 in the second direction. Similarly, the third elastic component 11 can also move with the moving knife 200 in the third direction. It is understood by those skilled in the art that the above structure is not limited, as long as the effect of the third elastic component 11 and the fourth elastic component 12 not affecting the movement of the moving knife 200 in the second direction and the third direction is achieved.

[0091] In some embodiments of the application, a pressure detection assembly 1300 is installed between the support 300 and the moving knife 200, so that when the needle presses the moving knife 200 to compress the fourth elastic component 12 and cause the moving knife 200 to move downward in the third direction, the moving knife 200 will cause the pressure value detected by the pressure detection assembly 1300 to increase. When the moving knife 200 moves a certain distance, the pressure value detected by the pressure detection assembly 1300 exceeds a threshold value, at which time the protection program of the control host is triggered to stop the action of the needle, the rotating shuttle, the support and the second driving assembly 600. It is predictable that when the pressure value detected by the pressure detection assembly 1300 exceeds the threshold value, the moving knife 200 has not reached the limit position of the third direction movement, which ensures that the needle will not be broken. At the same time, the safety distance of the moving knife 200 moving in the second direction is greater than the distance of the moving knife 200 moving in the third direction, that is, when the moving knife 200 is pressed by the needle to move aside, the pressure detected by the pressure detection assembly 1300 will not exceed the threshold value, thereby avoiding the protection program from being triggered by mistake.

[0092] In some embodiments of the present application, the pressure detection assembly 1300 comprises an elastic air bag 1301 mounted between the support 300 and the moving knife 200, and the elastic air bag 1301 is connected with a pressure sensor mounted on the first driving assembly 400 through an air pipe. It is predictable that the pressure sensor measures the gas pressure in the elastic air bag 1301. When the moving knife 200 is pressed by the needle and moves downward along the third direction, the elastic air bag 1301 will be squeezed, so that the gas pressure in the elastic air bag 1301 becomes larger. 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 value, the protection program is started. The degree of the moving knife 200 being pressed can be quickly detected by the pressure sensor with fast response, so that the problem of the needle and the moving knife being broken due to the misoperation of the personnel during the execution of the line cutting operation can be solved.

[0093] Alternatively, with reference to Figures 12-17In some embodiments of the present application, the yielding action of the moving blade 200 does not need to be in contact with the needle, and the yielding is generated by the action during the process of the moving blade 200 approaching the needle, and then the moving blade 200 is reset after the hook-shaped structure 201 on the moving blade 200 passes the needle. Specifically, the arc-shaped top block 18 is arranged at the position of the moving blade 200 on the left side of the second direction, and the arc-shaped top block 18 is not in the same plane as the fixed blade 1 (specifically, the arc-shaped top block 18 can be arranged higher than the fixed blade 1, and the cooperating block 19 is also arranged higher than the fixed blade 1, so that the cooperating block 19 can pass above the fixed blade 1 during the retraction process), and the cooperating block 19 is installed on the upper side of the moving blade 200 for contact with the arc-shaped top block 18. The arc-shaped top block 18 protrudes towards the right side of the second direction, so that when the moving blade 200 moves, the arc-shaped top block 18 will be in contact with the cooperating block 19 after approaching the needle to a certain distance. Through the contact between the arc-shaped top block 18 and the cooperating block 19, the moving blade 200 will be displaced to the right side of the second direction, and the third elastic component 11 will be compressed. The moving blade 200 continues to move towards the needle, and after passing the needle, the arc-shaped top block 18 is out of contact with the cooperating block 19. The moving blade 200 will move to the left side of the second direction under the action of the third elastic component 11 to reset, so as to satisfy that the needle is placed in the hook-shaped structure 201 on the moving blade 200. Specifically, the first arc-shaped corner is between the front side of the arc-shaped top block 18 along the first direction and the right side along the second direction, so that when the cooperating block 19 moves towards the needle, when it touches the arc-shaped corner, the arc-shaped corner can make the moving blade 200 move to the right side of the second direction, thereby avoiding the needle. When the cooperating block 19 continues to move towards the needle and passes the arc-shaped top block 18, the moving blade 200 is reset under the action of the third elastic component 11. The cooperating block 19 is within the range of the arc-shaped corner of the arc-shaped top block 18 on the left side of the second direction, so that during the movement of the cooperating block 19 from the first direction towards the needle, it can directly contact the arc-shaped corner to force the cooperating block 19 to move to the right side of the second direction;

[0094] It should be understood that during the process of the moving blade 200 moving the face line 16 and the bottom line 17 to retract along the front side of the first direction and moving towards the fixed blade 1, if the arc-shaped top block 18 also contacts the cooperating block 19, the moving blade 200 will be displaced to the right side of the second direction. At this time, the face line 16 has been placed on the hook-shaped structure 201 on the moving blade 200, but the position of the bottom line 17 is close to the position of the needle, which may cause the moving blade 200 to be directly separated from the bottom line 17, resulting in failure to hook the line. In order to solve this problem, reference is made to Figures 12-18, as an embodiment, the bottom surface (the lower surface along the third direction) of the arc-shaped top block 18 is a slope or an arc surface gradually rising from front to back along the first direction, or the bottom surface of the arc-shaped top block 18 and the rear surface are second-arc-shaped rounded corners; and in this embodiment, the upper 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 towards the fixed knife 1, it first contacts the bottom slope 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 towards the third direction and then passes through the arc-shaped top block 18, at this time the moving knife will not have displacement towards the right side of the second direction. Preferably, the matching block 19 has a third-arc-shaped rounded corner matched with the first-arc-shaped rounded corner, and a fourth-arc-shaped rounded corner matched with the second-arc-shaped rounded corner, and when the moving knife 200 continues to move back, after the arc-shaped top block 18 and the matching block 19 are out of contact, the moving knife 200 moves upward along the third direction under the action of the fourth elastic component 12 to reset, and in this embodiment, during the movement of the moving knife 200 from the needle towards the fixed knife 1, when the arc-shaped top block 18 and the matching block 19 are in contact, the moving knife 200 will not move towards the right side of the second direction, but will be affected by the surface of the arc-shaped top block 18 towards the lower side of the third direction, and will move towards the lower side of the third direction, thereby avoiding the blockage of the arc-shaped top block 18, and relative to the use of the needle to make the moving knife 200 produce a yielding action, in this embodiment, the yielding action is achieved by the contact between the arc-shaped top block 18 and the matching block 19 instead of the contact with the needle, which avoids the impact load on the needle and solves the problem of loosening of the needle after being impacted multiple times. It can be predicted that in order to facilitate the yielding action of the moving knife and the contact between the arc-shaped top block 18 and the matching block 19, a chamfer or the like is provided on the surface of the matching block 19 that contacts the arc-shaped top block 18, which will not be described in detail in this embodiment.

[0095] In some embodiments of the present application, the entire thread trimming device is arranged below the sewing machine table, and the first driving device 9 in the present embodiment is mounted on the body of the sewing machine, and the first driving assembly 400 is slidingly connected to the body of the sewing machine, so as to ensure that the first driving assembly 400 can be stably driven and moved by the first driving device 9. The bracket 300 has a housing component 302, and the housing component 302 is open on the side surfaces in the second direction left side and the third direction upper side, respectively. The movable knife 200 also has a main body component 202, and the main body component 202 is in a housing structure and is open on the side surfaces in the second direction right side and the third direction lower side, respectively. The main body component 202 of the movable knife 200 is provided with a first slide column 203, and the first slide column 203 is slidingly matched with a first sliding groove 303 (the first sliding groove 303 is a long slot extending along the second direction, and the first sliding groove 303 can be a through slot penetrating the bottom surface of the housing component 302) arranged on the housing component 302 of the bracket 300. Meanwhile, the first slide column 203 is used to limit the movable knife 200 from being separated from the bracket 300 along the third direction under the action of the fourth elastic component 12. Preferably, the first slide column 203 has a column body sliding in the first sliding groove 303, and a baffle at the lower end of the column body is arranged on the lower side of the housing component 302, and the baffle cannot pass through the first sliding groove 303. Similarly, the housing component 302 of the bracket 300 is provided with a second slide column 304, and the second slide column 304 is slidingly matched with a second sliding groove 204 (the second sliding groove 204 is a long slot extending along the first direction, and the second sliding groove 204 can be a through slot penetrating the left side surface of the main body component 202) arranged on the main body component 202 of the movable knife 200. The second slide column 304 has a column body sliding in the second sliding groove 204, and a baffle at the left end of the column body is arranged on the left side of the main body component 202, and the baffle cannot pass through the second sliding groove 204. Meanwhile, the second slide column 304 is used to limit the movable knife 200 from being separated from the bracket 300 along the second direction under the action of the third elastic component 11. Through the structure in the present embodiment, the yielding action of the movable knife 200 can be realized, and the anti-misoperation protection program triggered after the needle head presses the movable knife 200.

[0096] In some embodiments of the present application, with reference to Figure 18The bracket 300 further comprises a guide rod 305 installed on the housing component 302 and extending along the second direction, the guide rod 305 is in sliding fit with a guide groove 401 formed on the first driving assembly 400, the first elastic component 5 is sleeved on the guide rod 305, one end of the first elastic component 5 is in action with the side wall of the first driving assembly 400 and the other end is in action with a boss 3051 arranged on the guide rod 305 of the bracket 300, in addition, the second driving assembly 600 and the third driving assembly 7 are coaxially arranged in the guide groove 401, the first driving assembly 400, the second driving assembly 600 and the third driving assembly 7 can slide relative to each other, the guide rod 305 is provided with a frame-shaped guide column 3052, the limiting block 301 is installed on the outside of the frame-shaped guide column 3052, the first elastic component 5 is arranged between the guide rod 305 and the frame-shaped guide column 3052, the second elastic component 8 is arranged outside the frame-shaped guide column 3052, the second driving assembly 600 is provided with an inner groove 601 capable of accommodating the frame-shaped guide column 3052 and the first elastic component 5 (the inner groove 601 is provided with a sliding groove in sliding fit with the frame-shaped guide column 3052), through the structure in the embodiment, the 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 assembly 600 can stably drive the third driving assembly 7 to move on the frame-shaped guide column 3052 through the second elastic component 8, as preferred, the front end of the housing component 302 is further fixed with a guide rod 306 matched with the guide rod 305, the first driving assembly 400 is provided with a guide hole 403 extending in the same direction as the guide groove 401, the guide rod 306 is in sliding fit with the guide hole 403 of the first driving assembly 400, and the guide rod 305 and the guide rod 306 play a role in stabilizing the guide of the bracket 300.

[0097] The right side wall of the housing of the first driving assembly 400 is provided with a long strip sliding hole 402, the long strip sliding hole 402 is communicated into the guide groove 401, and the long strip sliding hole 402 is elongated along the first direction. The second driving assembly 600 has a cylinder 602, the cylinder 602 is sleeved on the guide rod 305 of the bracket 300 in sliding fit, the cylinder 602 is provided with an inner groove 601, and the cylinder 602 is connected with a driving plate 603, the driving plate 603 is in sliding fit on the long strip sliding hole 402 of the right side wall of the first driving assembly 400, and the part of the driving plate 603 extending out of the housing of the first driving assembly 400 is connected with the second driving device 10, the second driving device 10 drives the cylinder 602 to move along the first direction through the driving plate 603.

[0098] The industrial sewing machine thread cutting device described in the application solves the problems of needle breakage and equipment damage caused by mechanical interference in the continuous high-speed operation of the traditional thread cutting device by optimizing the relative position design of the fixed knife 1 and the moving knife 200, introducing precise driving and elastic component cooperation, and adopting the hook-shaped structure 201 on the moving knife 200, which is designed as an arc shape, so that when the moving knife 200 contacts the needle, it can automatically produce a lateral displacement action (as an optimization, by setting the arc-shaped top block 18 and the top touch cooperation of the cooperation block 19, the moving knife 200 will be displaced to the right in the second direction, the third elastic component 11 will be compressed, and the displacement action for the needle will be produced), and the face thread 16 and the bottom thread 17 will be completely stored inside the hook-shaped structure 201 during the reset process, and the fixed knife 1 will form precise engagement. The design utilizes the reciprocating movement of the bracket 300 along the first direction, and the cooperative work of the first driving assembly 400, the second driving assembly 600 and the third driving assembly 7, and realizes effective buffering and adjustment of the reset of the moving knife 200 and the impact load of the thread cutting by setting the first elastic component 5 and the second elastic component 8 between the driving assemblies, so as to ensure that the moving knife 200 will not be directly hard connected with the needle during the reset process, which will cause excessive impact load and cause the fixed knife 1 to wear, and can also prevent the needle from breaking due to mechanical interference with the moving knife 200 when the needle has not been completely separated, and the limit block 301, the fifth elastic component 14 and the pressure detection assembly 1300 are introduced between the bracket 300 and the driving assembly, which realizes precise control and real-time monitoring of the position of each moving part, and ensures that the protection program can be automatically started to stop the thread cutting operation to prevent misoperation in any abnormal situation. The industrial sewing machine thread cutting device described in the application has compact structure and reasonable design, and the synchronous, stable and efficient reciprocating movement of each part is realized by driving through the electric telescopic rod, and the vibration and impact are minimized by means of multi-stage elastic buffering device, which not only improves the thread cutting precision and cutting quality, but also significantly prolongs the service life of the fixed knife 1 and the moving knife 200 and other key components, reduces the maintenance cost and fault risk caused by mechanical impact, and enables the industrial sewing machine to perform safe, reliable, efficient and economical thread cutting operation under the conditions of large-scale production and high-speed continuous operation.

[0099] The application also provides a control method of the above-mentioned industrial sewing machine thread cutting device, comprising the following steps:

[0100] Step 1: Send thread cutting instruction to control host, it is foreseeable that when the thread cutting operation is not performed, the first driving assembly 400 and the second driving assembly 600 are in the initial retracted state, after the sewing of the fabric is completed, the thread cutting operation is started;

[0101] Step 2: The first driving device 9 and the second driving device 10 act simultaneously to drive the first driving assembly 400 and the second driving assembly 600 to move to the limit position, under the cooperation of the arc-shaped top block 18 and the cooperating block 19, the moving knife 200 generates a let-in action by compressing the third elastic component 11, the thread separator on the rotating hook separates the face thread 16, when the moving knife 200 is at the limit position, the needle is inside the hook-shaped structure 201 of the moving knife 200, and then the face thread 16 is hooked on the hook-shaped structure 201 of the moving knife 200 after the rotating hook releases the face thread 16;

[0102] Step 3: The first driving device 9 acts to drive the moving knife 200 to retract, after the first driving device 9 retracts by a distance, the second driving device 10 acts, and the first driving device 9 and the second driving device 10 retract to the initial position simultaneously, and the moving knife 200 and the fixed knife 1 complete the thread cutting operation.

[0103] It should be understood that the first driving device 9 acts to drive the moving knife 200 to retract, in this process, if the needle does not move out of the range of the moving knife 200, the second elastic component 8 will be compressed to avoid the needle being broken, in the case that the moving knife 200 is blocked by the needle, not driving the second driving device 10 first can ensure that the relative distance between the second driving assembly 600 and the first driving assembly 400 does not change, after the needle no longer blocks the moving knife 200, the support 300 will retract to the first driving assembly 400 under the action of the second elastic component 8, in the process of retraction, the first elastic component 5 plays a buffering role to avoid the bottom thread 17 and the face thread 16 from slipping.

[0104] In the embodiment, a misoperation prevention protection mode is also included, in the process of step 2 and step 3, after the installed pressure detection assembly 1300 detects that the pressure exceeds the set threshold, the control host receives the signal to start the shutdown, interrupts the action of the needle and the rotating hook, and stops executing step 2 and step 3, after resetting the needle, the control host continues to execute step 2 or step 3, which plays a role in preventing the needle from being broken by pressing the moving knife 200. The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any change or replacement that can be easily thought of by those skilled in the art within the technical range disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A thread-cutting device for an industrial sewing machine, characterized in that, include: Fixed blade (1); The movable blade (200) cooperates with the fixed blade (1) to cut the thread. The movable blade (200) has a hook-shaped structure (201) for hooking the thread. The movable blade (200) has a yielding action to place the needle tip inside the hook-shaped structure (201) on the movable blade (200). A bracket (300) for mounting a movable blade (200) slides along a first direction of a fixed blade (1), and the bracket (300) is spaced apart from the fixed blade (1) on the right side along a second direction of the fixed blade (1). The first direction and the second direction are perpendicular to each other, and the movable blade (200) can slide back and forth relative to the bracket (300) along the second direction. A first drive assembly (400) for mounting a bracket (300) is provided. A first elastic member (5) acts between the first drive assembly (400) and the bracket (300), and the first elastic member (5) applies a force away from the first drive assembly (400) to the bracket (300). A second drive assembly (600) and a third drive assembly (7) are slidably mounted in the first drive assembly (400). A second elastic member (8) acts between the second drive assembly (600) and the third drive assembly (7), and the third drive assembly (7) is driven by the second elastic member (8) to move the bracket (300) closer to the first drive assembly (400). First drive device (9) for driving the first drive assembly (400) to reciprocate in a first direction. A second drive device (10) for driving the second drive assembly (600) to reciprocate relative to the first drive assembly (400) in a first direction.

2. The industrial sewing machine thread trimming device according to claim 1, characterized in that, The moving blade (200) can move relative to the support (300) along a third direction, which is perpendicular to the first direction and the second direction respectively.

3. The industrial sewing machine thread trimming device according to claim 2, characterized in that, A third elastic component (11) is provided between the moving blade (200) and the support (300), and the third elastic component (11) applies a force acting in the second direction to the moving blade (200).

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

5. The industrial sewing machine thread trimming device according to claim 3, characterized in that, The hook-shaped structure (201) on the moving blade (200) has an arc-shaped exterior, and the interior of the hook-shaped structure (201) of the moving blade (200) cooperates with the fixed blade (1) to cut the wire.

6. The industrial sewing machine thread trimming device according to claim 4, characterized in that, The pressure detection assembly (1300) includes an elastic airbag (1301) installed between the bracket (300) and the moving blade (200), and the elastic airbag (1301) is connected to a pressure sensor installed on the first drive assembly (400) via an air tube.

7. The industrial sewing machine thread trimming device 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). The fifth elastic component (14) is used to buffer the force exerted by the second drive device (10) when driving the second drive component (400) to move.

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

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

10. A control method for the thread-cutting device of an industrial sewing machine according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Send a wire-cutting command to the control host; Step 2: The first drive device (9) and the second drive device (10) operate simultaneously, driving the first drive assembly (400) and the second drive assembly (600) to move respectively, causing the moving blade (200) to move closer to the fixed blade (1). At the same time, the host machine drives the needle and rotary hook of the sewing machine to move. During the process of the moving blade (200) moving closer to the needle, a yielding action is generated. The thread separator on the rotary hook separates the face thread. When the moving blade (200) moves to the set position, the needle is located inside the hook structure (201) of the moving blade (200). After the rotary hook releases the face thread, the face thread is hooked on the hook structure (201) of the moving blade (200). Step 3: The first drive device (9) first moves to drive the moving blade (200) to retract. After the first drive device (9) retracts one distance, the second drive device (10) moves. The first drive device (9) and the second drive device (10) retract to the initial position at the same time. The moving blade (200) and the fixed blade (1) complete the thread cutting operation. It also includes a protection mode to prevent misoperation. During the process of step 2 and step 3, after the installed pressure detection component detects that the pressure exceeds the set threshold, the control host receives the signal to start the shutdown, interrupts the action of the needle and the rotary hook and stops executing step 2 and step 3. After resetting the needle, the control host continues to execute step 2 or step 3.

Images