Wire tension adjustment device and adjustment method

Abstract

The application provides a thread tension adjusting device and adjusting method. The thread tension adjusting device comprises a mounting plate, an adjusting plate and a thread clamp assembly arranged on the mounting plate. The thread clamp assembly comprises a plurality of thread clamps linearly distributed along a set direction. Each thread clamp comprises two thread clamping pieces oppositely arranged and forming a clamping gap for passing a thread. The adjusting plate is provided with an adjusting claw assembly comprising a plurality of adjusting claws. The number of the adjusting claws is the same as that of the thread clamps, and each adjusting claw corresponds to one thread clamp. The adjusting plate can move along the set direction relative to the mounting plate, thereby driving the adjusting claws to move and be clamped into or moved out of the clamping gaps of the corresponding thread clamps. By clamping or moving out of the clamping gaps of the corresponding thread clamps, the size of the clamping gaps for the top thread and the bottom thread is adjusted, thereby realizing the thread tension adjustment of the thread, and the problem of thread opening is solved.

Description

Technical Field

[0001] This invention relates to the field of sewing technology, and in particular to a thread tension adjusting device and adjusting method. Background Technology

[0002] As we all know, a sewing machine is a machine that uses one or more threads to form one or more stitches on the fabric, so that one or more layers of fabric are interwoven or sewn together. A sewing machine generally consists of four parts: a feeding device, a base, a transmission, and accessories. Through the reasonable coordination of the movement of each mechanism, the machine works in a cycle to sew the fabric together.

[0003] Currently, traditional sewing machines use a manual rotation of the thread tension adjustment knob to compress a spring, altering the tension of the top and bottom threads during sewing to ensure stable thread output. For example, during sewing, the top thread may need to be tightened while the bottom thread is loosened to produce more regular stitches and better sewing results. However, in practical use, it has been found that this method results in stitches that are prone to unraveling. Summary of the Invention

[0004] The purpose of this invention is to provide a thread tension adjusting device and method for adjusting the thread tension of the top thread and the bottom thread, thereby ensuring that the top thread and the bottom thread at the end of the stitch are tangled together, thus preventing the thread from coming undone.

[0005] To achieve the above objectives, the present invention provides a thread tension adjusting device, including a mounting plate, an adjusting plate, and a thread clamp assembly disposed on the mounting plate. The thread clamp assembly includes a plurality of thread clamps linearly distributed along a predetermined direction. Each thread clamp includes two clamping plates, which are arranged opposite to each other to form a slit for threading. The adjusting plate is provided with an adjusting claw assembly, which includes a plurality of adjusting claws. The number of adjusting claws is the same as the number of thread clamps, and each adjusting claw corresponds to a thread clamp. The adjusting plate can move relative to the mounting plate along the predetermined direction, thereby driving the adjusting claws to move and engage or disengage from the slit of the corresponding thread clamp.

[0006] Optionally, the wire clamp assembly includes a bottom wire clamp and at least two top wire clamps, and the adjusting claw assembly includes a bottom wire adjusting claw and at least two top wire adjusting claws;

[0007] When the bottom thread adjusting claw is located inside the gap of the bottom thread clamp, the top thread adjusting claw is located outside the gap of the top thread clamp;

[0008] When the bottom thread adjusting claw is outside the gap of the bottom thread clamp, the top thread adjusting claw is inside the gap of the top thread clamp.

[0009] Optionally, the wire clamp further includes a central screw, an adjusting cap, a stop, and a spring, wherein the adjusting cap, the stop, and the wire clamp are arranged sequentially along the axial direction of the central screw;

[0010] One end of the screw is connected to the mounting plate, and the other end extends in a direction perpendicular to the surface of the mounting plate;

[0011] The abutment has a cavity, and the abutment is slidably sleeved on the outside of the central screw with one end abutting against the wire clamp;

[0012] The adjusting cap is threadedly connected to the central screw and partially extends into the cavity;

[0013] The spring is located inside the cavity, with one end abutting against the inner wall of the abutment and the other end abutting against the adjusting cap;

[0014] By turning the adjusting cap, the adjusting cap can be moved axially relative to the central screw and squeeze the spring. The spring squeezes the clamp through the abutment, thereby adjusting the size of the clamp.

[0015] Optionally, the adjusting cap is provided with an adjusting nut, one end of which is connected to the adjusting cap and the other end abuts against the spring. The adjusting nut is also threadedly connected to the central screw. By screwing the adjusting cap, the adjusting nut is moved relative to the central screw and compresses the spring.

[0016] Optionally, one end of the adjusting nut is provided with a toothed groove and a toothed protrusion corresponding to the adjusting cap, so that the adjusting nut and the adjusting cap are engaged and connected.

[0017] Optionally, the line tension adjusting device further includes a drive cylinder fixed on the mounting plate, the drive cylinder being used to drive the adjusting plate to move relative to the mounting plate along the set direction.

[0018] Optionally, the drive cylinder has a telescopic rod, which is bolted to the adjusting plate.

[0019] Optionally, the adjustment plate is provided with a plurality of limiting grooves extending along the set direction, and the mounting plate is provided with a plurality of limiting pins, the limiting pins being engaged in the corresponding limiting grooves and being able to slide relative to the limiting grooves.

[0020] Optionally, the mounting plate has a thread hole for the sewing thread to pass through.

[0021] Based on this, the present invention also provides a thread tension adjustment method for adjusting the thread tension of the bottom thread and top thread of a sewing machine before thread cutting. The sewing machine includes a controller, a thread cutting device, a foot pedal, a needle, and the thread tension adjustment device described above, and includes the following steps:

[0022] When sewing reaches the point where the thread needs to be cut, the needle moves to the stop position, and the controller sends a first signal to the drive cylinder of the thread tension adjustment device.

[0023] After receiving the first signal, the drive cylinder drives the adjustment plate to move relative to the mounting plate in a set direction.

[0024] After the bottom thread adjusting claw moves out of the gap of the bottom thread clamp and the top thread adjusting claw is inserted into the gap of the top thread clamp, the drive cylinder sends a second signal to the controller, and the controller controls the needle to continue sewing.

[0025] After a preset time, the needle returns to the stop position, and the controller sends a third signal to the drive cylinder;

[0026] After receiving the third signal, the drive cylinder drives the adjustment plate to move in the opposite direction to the set direction relative to the mounting plate.

[0027] After the bottom thread adjusting claw engages with the gap of the bottom thread clamp and the top thread adjusting claw moves out of the gap of the top thread clamp, the drive cylinder sends a fourth signal to the controller.

[0028] After receiving the fourth signal, the controller controls the wire-cutting device to cut the wire.

[0029] In the thread tension adjustment device and method provided by the present invention, by driving the adjustment plate to move relative to the mounting plate along the set direction, the adjustment claw is driven to move and engage or disengage from the corresponding clamping slot of the thread clamp, thereby changing the size of the clamping slot of the corresponding top thread and bottom thread, so as to realize the adjustment of the clamping force (thread tension) of the top thread and bottom thread, thereby ensuring that the top thread and bottom thread at the end of the stitch are wrapped together, and achieving the purpose of preventing the thread from coming undone. Attached Figure Description

[0030] Those skilled in the art will understand that the accompanying drawings are provided to better understand the invention and do not constitute any limitation on the scope of the invention. Wherein:

[0031] Figure 1 This is a front view of the line tension adjustment device provided in an embodiment of the present invention;

[0032] Figure 2 This is a front view of the line tension adjusting device provided in an embodiment of the present invention;

[0033] Figure 3 A cross-sectional view of a wire clamp provided in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the adjustment plate provided in an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of a sewing machine provided in an embodiment of the present invention;

[0036] Figure 6 A flowchart of a line tension adjustment method provided in an embodiment of the present invention;

[0037] The attached figures are labeled as follows:

[0038] 1-Main body; 2-First line tension adjustment device; 3-Second line tension adjustment device;

[0039] 10-Mounting plate; 11-Limit pin; 20-Adjusting plate; 21-Limit groove; 30-Wire clamp; 31-Wire clamping piece; 32-Center screw; 33-Adjusting cap; 34-Support; 35-Spring; 36-Adjusting nut; 40-Adjusting claw; 50-Drive cylinder. Detailed Implementation

[0040] To make the objectives, advantages, and features of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the embodiments of this invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may emphasize different aspects and may sometimes use different scales.

[0041] As used herein, the singular forms “a,” “an,” and “the” include plural objects unless otherwise expressly indicated. As used herein, the term “or” is generally used to include “and / or” unless otherwise expressly indicated. As used herein, the term “a number” is generally used to include “at least one” unless otherwise expressly indicated. As used herein, the term “at least two” is generally used to include “two or more” unless otherwise expressly indicated. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature.

[0042] Figure 1This is a front view of the line tension adjusting device provided in an embodiment of the present invention. Figure 2 This is a front view of the line tension adjusting device provided in an embodiment of the present invention. Figure 3 This is a cross-sectional view of the wire clamp provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the adjustment plate provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of a sewing machine provided in an embodiment of the present invention. Figure 6 A flowchart of a line tension adjustment method provided in an embodiment of the present invention.

[0043] Please refer to Figures 1-4 This embodiment provides a thread tension adjusting device, including a mounting plate 10, an adjusting plate 20, and a thread clamp assembly disposed on the mounting plate 10. The thread clamp assembly includes a plurality of thread clamps 30 linearly distributed along a set direction. Each thread clamp 30 includes two clamping plates 31, which are arranged opposite to each other to form a slit for threading. The adjusting plate 20 is provided with an adjusting claw assembly, which includes a plurality of adjusting claws 40. The number of adjusting claws 40 is the same as the number of thread clamps 30, and each adjusting claw 40 corresponds one-to-one with a thread clamp 30. The adjusting plate 20 can be adjusted relative to the mounting plate 10 along the set direction. Figure 1 and Figure 2 The adjustment claw 40 moves in the left and right directions, thereby moving the adjustment claw 40 and engaging or disengaging from the corresponding slot of the wire clamp 30.

[0044] The adjusting plate 20 can be moved relative to the mounting plate 10 along the set direction, thereby causing the adjusting claw 40 to move and engage or disengage from the corresponding seam clamp 30, thus changing the size of the seam between the top and bottom threads to adjust the tension (clamping force) of the top and bottom threads. For example, when the adjusting claw 40 engages in the seam of the corresponding seam clamp 30, the seam becomes larger, thus reducing the clamping force on the thread in the seam, i.e., the thread becomes looser. Conversely, when the adjusting claw 40 disengages from the seam of the corresponding seam clamp 30, the seam becomes smaller, thus increasing the clamping force on the thread in the seam, i.e., the thread becomes tighter.

[0045] The thread tension adjusting device provided in this embodiment is mainly used in coverstitch machines, such as computer-controlled direct-drive high-speed coverstitch machines. During normal sewing, the coverstitch machine needs to tighten the top thread and loosen the bottom thread using its built-in thread tension adjusting device (hereinafter referred to as the first thread tension adjusting device) to ensure stable thread output, resulting in more regular stitches and better sewing quality. Generally, after the main body sewing is completed, the thread needs to be trimmed. However, if the stitches of the top and bottom threads are too regular, the thread is prone to unraveling. Therefore, before trimming the thread after the main body sewing is completed, the thread tension adjusting device (hereinafter referred to as the second thread tension adjusting device) provided in this embodiment can be used to adjust the thread tension of the top and bottom threads between the first and second thread tension adjusting devices. The top thread is loosened while the bottom thread is tightened. After sewing a few more stitches, the thread is trimmed to ensure that the top and bottom threads at the end of the stitch are intertwined, thus preventing unraveling.

[0046] By combining the existing first thread tension adjustment device with the second thread tension adjustment device provided in this embodiment, the thread tension of the sewing thread can be adjusted, which can not only ensure that the sewn stitches are regular and beautiful, but also prevent the stitches from coming undone, thus ensuring that the sewn items are reliable and stable.

[0047] In this embodiment, the wire clamping assembly includes a bottom wire clamp and at least two top wire clamps, and the adjusting claw assembly includes a bottom wire adjusting claw and at least two top wire adjusting claws;

[0048] When the bottom thread adjusting claw is located inside the gap of the bottom thread clamp, the top thread adjusting claw is located outside the gap of the top thread clamp;

[0049] When the bottom thread adjusting claw is outside the gap of the bottom thread clamp, the top thread adjusting claw is inside the gap of the top thread clamp.

[0050] During the sewing process, the bottom thread adjusting claw is located within the gap of the bottom thread clamp, and the top thread adjusting claw is located within the gap of the top thread clamp to ensure stable thread output and result in more regular stitches. Before cutting the thread after the main body sewing is completed, the adjusting plate 20 is moved so that the bottom thread adjusting claw is located outside the gap of the bottom thread clamp, and the top thread adjusting claw is located inside the gap of the top thread clamp, to loosen the top thread in the top thread clamp and tighten the bottom thread in the bottom thread clamp.

[0051] In this embodiment, Figure 1 The three wire clamps 30 distributed from left to right are the top wire clamp, the bottom wire clamp, and the bottom wire clamp, respectively. Figure 1 The three adjusting claws 40 distributed from left to right are the top line adjusting claw, the top line adjusting claw, and the bottom line adjusting claw.

[0052] It should be understood that this application does not impose any limitation on the number of thread clamps 30, which can be determined according to the required stitch length, and can be three, four, five or even more. Based on the actual sewing effect, under the premise of simplifying the result and controlling costs, three thread clamps 30 are generally sufficient, namely one bottom thread clamp and two top thread clamps. This is because even for sewing with four, five or more threads, by adjusting the one bottom thread clamp and two top thread clamps provided in this embodiment, the remaining top thread clamps can ensure that the top and bottom threads at the end of the stitch are intertwined, thus preventing the stitch from unraveling.

[0053] Please refer to Figure 3 The wire clamp 30 also includes a central screw 32, an adjusting cap 33, a stop 34, and a spring 35. The adjusting cap 33, the stop 34, and the wire clamp 30 are arranged sequentially along the axial direction of the central screw 32.

[0054] One end of the screw is connected to the mounting plate 10, and the other end extends in a direction perpendicular to the surface of the mounting plate 10;

[0055] The abutment 34 has a cavity, and the abutment 34 is slidably sleeved on the outside of the central screw 32 and one end abuts against the wire clamp 30;

[0056] The adjusting cap 33 is threadedly connected to the central screw 32 and partially extends into the cavity;

[0057] The spring 35 is located inside the cavity and one end abuts against the inner wall of the abutment 34, while the other end abuts against the adjusting cap 33;

[0058] By turning the adjusting cap 33, the adjusting cap 33 can be moved axially relative to the central screw 32 and squeeze the spring 35. The spring 35 squeezes the wire clamp 30 through the abutment 34, thereby adjusting the size of the clamping gap.

[0059] In this embodiment, the adjusting cap 33, the abutment 34, and the wire clamp 30 are arranged sequentially from the outside to the inside along the axial direction of the central screw 32. One end of the screw is fixedly connected to the mounting plate 10, and the other end is provided with an external thread. The two clamping plates 31 of the wire clamp 30 are usually rotatably sleeved on the outside of the central screw 32 to facilitate the pre-adjustment of the compression of the spring 35. After the position of the clamping plates 31 is adjusted, they are fixed on the central screw 32.

[0060] When the adjusting cap 33 is turned, for example, clockwise, the adjusting cap 33 moves to the right (towards the abutment 34), causing the spring 35 to be compressed. The spring 35 applies a rightward force to the thread clamp 30 through the abutment 34, making the gap between the two clamping plates 31 of the thread clamp 30 smaller, thus increasing the clamping force on the thread in the gap, that is, clamping the thread tighter, and vice versa.

[0061] Preferably, the adjusting cap 33 is provided with an adjusting nut 36, one end of which is connected to the adjusting cap 33 and the other end is in contact with the spring 35. The adjusting nut 36 is threadedly connected to the central screw 32. By turning the adjusting cap 33, the adjusting nut 36 is moved relative to the central screw 32 and the spring 35 is compressed.

[0062] Further preferably, one end of the adjusting nut 36 is provided with a corresponding toothed groove and a toothed protrusion on the adjusting cap 33, so that the adjusting nut 36 and the adjusting cap 33 are engaged and connected. This engaging connection provides high transmission accuracy, which is beneficial for improving the adjustment accuracy of the line tension. Of course, the adjusting nut 36 and the adjusting cap 33 can also be connected in other ways, and this application does not impose any limitations on this.

[0063] Please continue to refer to Figures 1-2 The line tension adjustment device further includes a drive cylinder 50 fixed on the mounting plate 10, the drive cylinder 50 being used to drive the adjustment plate 20 to move relative to the mounting plate 10 along the set direction.

[0064] In this embodiment, the drive cylinder 50 has a telescopic rod, which is bolted to the adjusting plate 20. Therefore, by setting a relevant control program, the operation of the drive cylinder 50 can be controlled, enabling automatic adjustment of thread tension. Compared to traditional manual adjustment, this method offers higher precision and a higher degree of intelligence, effectively improving production efficiency. For example, during normal sewing, the drive cylinder 50 is not in operation; the bottom thread adjusting claw is located within the gap of the bottom thread clamp, and the top thread adjusting claw is located within the gap of the top thread clamp. Before thread cutting after the main sewing is completed, the drive cylinder 50 is controlled to operate, causing the telescopic rod to extend, thereby driving the adjusting plate 20 to move relative to the mounting plate 10 along the set direction. This causes the bottom thread adjusting claw to move out of the gap of the bottom thread clamp, and the top thread adjusting claw to engage within the gap of the top thread clamp, thus loosening the top thread in the top thread clamp and tightening the bottom thread in the bottom thread clamp. After thread cutting, the drive cylinder reverses its direction and drives the adjusting plate 20 to reset.

[0065] For a better option, please refer to Figure 2The adjusting plate 20 has several limiting grooves 21 extending along the set direction, and the mounting plate 10 has several limiting pins 11. The limiting pins 11 are engaged in the corresponding limiting grooves 21 and can slide relative to the limiting grooves 21. The limiting grooves 21 are used to guide and limit the movement of the adjusting plate 20, so that the adjusting plate 20 moves relative to the mounting plate 10 along the set direction.

[0066] In this embodiment, the limiting groove 21 is waist-shaped. The number of limiting grooves 21 can be one or more, and this application does not impose any limitation on this.

[0067] In this embodiment, the mounting plate 10 has a thread hole for the sewing thread to pass through.

[0068] Based on this, please refer to Figure 5 This embodiment also provides a sewing machine, including the above-mentioned thread tension adjustment device. The sewing machine is, for example, a coverstitch machine. The sewing machine also includes a main body 1. The main body 1 is provided with conventional components such as a feeding mechanism, a thread cutting mechanism, and a presser foot lifting mechanism. Since this application does not make any improvements to the main body 1, it will not be described in detail here.

[0069] The sewing machine also has a built-in thread tension adjustment device, namely the first thread tension adjustment device 2 mentioned above. The mounting plate 10 of the thread tension adjustment device, namely the second thread tension adjustment device 3 provided in this embodiment, is fixed on the top of the first thread tension adjustment device 2. The sewing thread is passed through the thread clamp of the second thread tension adjustment device 3 into the thread clamp of the first thread tension adjustment device 2.

[0070] Please refer to Figure 6 This embodiment also provides a thread tension adjustment method for adjusting the thread tension of the bobbin thread and the top thread of a sewing machine before cutting the thread. The sewing machine includes a controller, a thread cutting device, a foot pedal, a needle, and the thread tension adjustment device described above, and includes the following steps:

[0071] S1. When sewing reaches the point where the thread needs to be cut, the needle moves to the stop position, and the controller sends a first signal to the drive cylinder of the thread tension adjustment device.

[0072] S2. After receiving the first signal, the drive cylinder drives the adjustment plate to move relative to the mounting plate in a set direction.

[0073] S3. After the bottom thread adjusting claw moves out of the gap of the bottom thread clamp and the top thread adjusting claw is inserted into the gap of the top thread clamp, the drive cylinder sends a second signal to the controller, and the controller controls the needle to continue sewing.

[0074] S4. After a preset time, the needle returns to the stop position, and the controller sends a third signal to the drive cylinder.

[0075] S5. After receiving the third signal, the drive cylinder drives the adjustment plate to move in the opposite direction to the set direction relative to the mounting plate.

[0076] S6. After the bottom thread adjusting claw is engaged in the gap of the bottom thread clamp and the top thread adjusting claw is moved out of the gap of the top thread clamp, the drive cylinder sends a fourth signal to the controller.

[0077] S7. After receiving the fourth signal, the controller controls the wire-cutting device to cut the wire.

[0078] First, in step S1, when sewing reaches the point where thread trimming is required, meaning the main sewing is finished and the thread end needs to be gathered, stop pressing the pedal forward and start pressing the pedal backward to send a thread trimming signal to the controller. The controller determines whether the needle has moved to the stop position. When the needle moves to the stop position, it indicates that the sewing material needs to be trimmed. At this time, the controller sends a first signal to the drive cylinder of the thread tension adjustment device.

[0079] Then, step S2 is executed. When the drive cylinder receives the first signal, the drive cylinder runs (e.g., rotates forward) and drives the adjustment plate to move relative to the mounting plate in a set direction to adjust the tension of the surface line and the bottom line. At this time, the extension length of the drive cylinder can be used to determine whether the adjustment plate is in place.

[0080] Next, step S3 is executed. When the adjusting plate is in position, the bottom thread adjusting claw is outside the gap of the bottom thread clamp and the top thread adjusting claw is inside the gap of the top thread clamp. At this time, the top thread in the top thread clamp becomes loose, and the bottom thread in the bottom thread clamp becomes tight. The driving cylinder sends a second signal to the controller, and the controller controls the needle to continue sewing so that the top thread and bottom thread at the end of the stitch are wrapped together, thereby preventing the stitch from coming undone.

[0081] Then, step S4 is executed. After a preset time, the needle finishes sewing and returns to the stop position. The controller sends a third signal to the drive cylinder.

[0082] Next, step S5 is executed. After receiving the third signal, the drive cylinder runs in the opposite direction (e.g., reverses), driving the adjustment plate to move relative to the mounting plate in the opposite direction of the set direction, so that the bottom thread adjusting claw is engaged in the gap of the bottom thread clamp, and the top thread adjusting claw moves out of the gap of the top thread clamp, that is, it is reset, so as not to affect the sewing quality of the next piece of fabric.

[0083] Then, step S6 is executed. At this time, it can be determined whether the adjusting plate has been reset based on the retraction length of the driving cylinder, and then it can be determined whether the bottom thread adjusting claw has been inserted into the gap of the bottom thread clamp and whether the top thread adjusting claw has moved out of the gap of the top thread clamp. If the adjusting plate has been reset, the driving cylinder sends a fourth signal to the controller.

[0084] Finally, in step S7, after receiving the fourth signal, the controller controls the thread-cutting device to cut the thread, thus ending the entire sewing process.

[0085] The entire process described above is automatically controlled and requires no human intervention. The controller may be a microcomputer, single-chip microcomputer, or PLC, or other control components known to those skilled in the art. This application does not impose any specific limitations on this.

[0086] In summary, this invention provides a thread tension adjusting device and method. By driving the adjusting plate to move relative to the mounting plate along a set direction, the adjusting claw moves and engages or disengages from the corresponding gap of the thread clamp, thereby changing the size of the gap between the top and bottom threads. This adjusts the clamping force (thread tension) of the top and bottom threads, ensuring that the top and bottom threads at the end of the stitch are intertwined, thus preventing the thread from unraveling. Furthermore, the operation of the driving cylinder can be controlled by setting a relevant control program, enabling automatic adjustment of thread tension. Compared to traditional manual adjustment, this method offers higher precision and a higher degree of intelligence, effectively improving production efficiency.

[0087] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A thread tension regulating device, characterized by, The device comprises a mounting plate, an adjusting plate and a thread clamp assembly arranged on the mounting plate, the thread clamp assembly comprises a plurality of thread clamps linearly arranged along a certain direction, each thread clamp comprises two thread clamping pieces oppositely arranged and forming a thread clamping gap for clamping a thread, the adjusting plate is provided with an adjusting claw assembly comprising a plurality of adjusting claws, the number of the adjusting claws is the same as that of the thread clamps, and each adjusting claw corresponds to a thread clamp, the adjusting plate is movable relative to the mounting plate along the certain direction, thereby driving the adjusting claws to move and be clamped into or out of the thread clamping gap of the corresponding thread clamp; the thread clamp assembly comprises a bottom thread clamp and at least two face thread clamps, and the adjusting claw assembly comprises a bottom thread adjusting claw and at least two face thread adjusting claws; When the bottom thread adjusting claw is located in the thread clamping gap of the bottom thread clamp, the face thread adjusting claws are located outside the thread clamping gap of the face thread clamps; When the bottom thread adjusting claw is located outside the thread clamping gap of the bottom thread clamp, the face thread adjusting claws are located in the thread clamping gap of the face thread clamps.

2. The thread tension regulating device of claim 1, wherein, The thread clamp further comprises a center screw, an adjusting cap, a seat and a spring, the adjusting cap, the seat and the thread clamp are sequentially arranged along the axial direction of the center screw; One end of the screw is connected with the mounting plate, and the other end extends towards a direction perpendicular to the surface of the mounting plate; The seat has a cavity, the seat is slidably sleeved on the outer surface of the center screw and abuts against the thread clamp at one end; The adjusting cap is threadedly connected with the center screw and partially extends into the cavity; The spring is located in the cavity and abuts against the inner wall of the seat at one end and the adjusting cap at the other end; By rotating the adjusting cap, the adjusting cap is axially moved relative to the center screw and the spring is compressed, the spring compresses the thread clamp through the seat, thereby adjusting the size of the thread clamping gap.

3. The thread tension regulating device of claim 2, wherein, The adjusting cap is provided with an adjusting nut, one end of the adjusting nut is connected with the adjusting cap, the other end abuts against the spring, and the adjusting nut is threadedly connected with the center screw, by rotating the adjusting cap to drive the adjusting nut to move relative to the center screw and compress the spring.

4. The thread tension regulating device of claim 3, wherein One end of the adjusting nut is provided with a tooth groove and a protruding tooth corresponding to the adjusting cap, so that the adjusting nut is engaged with the adjusting cap.

5. The thread tension regulating device of claim 1, wherein The thread tension adjusting device further comprises a driving air cylinder fixed on the mounting plate, the driving air cylinder is used to drive the adjusting plate to move relative to the mounting plate along the certain direction.

6. The thread tension regulating device of claim 5, wherein, The driving air cylinder has a telescopic rod, the telescopic rod is bolted with the adjusting plate.

7. The thread tension regulating device of claim 5, wherein, The adjusting plate is provided with a plurality of limiting grooves extending along the certain direction, and the mounting plate is provided with a plurality of limiting pins, the limiting pins are clamped into the corresponding limiting grooves and can slide relative to the limiting grooves.

8. The thread tension regulating device of claim 1, wherein, The mounting plate is provided with a thread passing hole for the thread to pass through.

9. A thread tension adjustment method for adjusting the thread tension of a bobbin thread and a top thread of a sewing machine before cutting the threads, the sewing machine comprising a controller, a thread cutting device, a foot pedal, a needle and a thread tension adjustment device according to any one of claims 5-7, characterized in that, The device comprises the following steps: When sewing is needed to be stopped, the needle is moved to a needle stopping position, and the controller sends a first signal to the driving air cylinder of the thread tension adjusting device; The driving cylinder sends a second signal to the controller after the bottom thread adjusting claw moves out of the clamping gap of the bottom thread thread clamp and the face thread adjusting claw is clamped into the clamping gap of the face thread thread clamp, and the controller controls the needle to continue sewing; The needle returns to the needle stop position after a preset time, and the controller sends a third signal to the driving cylinder; The driving cylinder drives the adjusting plate to move in the opposite direction of the set direction relative to the mounting plate after receiving the third signal; The driving cylinder sends a fourth signal to the controller after the bottom thread adjusting claw is clamped into the clamping gap of the bottom thread thread clamp and the face thread adjusting claw moves out of the clamping gap of the face thread thread clamp; The controller controls the thread cutting device to cut the thread after receiving the fourth signal. ​

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