Sewing machine thread tension adjusting device and adjusting device control system

Abstract

The utility model provides a sewing machine thread tension adjusting device and an adjusting device control system which are applied to a sewing machine. The thread tension adjusting device comprises a driving assembly, a thread trapper shaft, a thread picking spring assembly, a driven thread clamping assembly, a driving thread clamping piece, an elastic body and a pressing cap, and one end of the thread trapper shaft is connected with the driving assembly. One end, far away from the driving assembly, of the yarn trapper shaft sequentially penetrates through the yarn picking spring assembly, the driven yarn clamping assembly, the driving yarn clamping sheet and the elastic body and then is connected with the pressing cap; an upper thread of the sewing machine penetrates between the driving thread clamping piece and the driven thread clamping assembly. The driving thread clamping piece and the pressing cap are arranged at the two ends of the elastic body respectively, and the end faces, close to the elastic body, of the driving thread clamping piece and the pressing cap are smooth planes, so that stress of the elastic body is uniform, stability of thread tension is guaranteed, tension parameters needing to be set during sewing can be reduced, and the probability of stitch skipping and thread breaking is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine equipment technical field, especially a sewing machine thread tension adjusting device and adjusting device control system. BACKGROUND

[0002] The sewing industry lockstitch machine changes the presentation effect of the sewing stitch by adjusting the size of thread tension.

[0003] Under the current market environment of the sewing industry, the market demand for clothes is diversified, showing the trend of small single fast feedback and diversified sewing materials, thereby causing the user to need to frequently change clothes, and the change of clothes means that the thread tension of sewing needs to be re-adjusted. The classic mechanical thread clamp adjusts the size of thread tension by adjusting the compression amount of the thread clamping spring. This kind of adjustment method completely relies on the sense of touch and does not have the ability of quantitative adjustment, and it is impossible to realize the rapid transplantation of the thread tension parameters of a machine with good working condition to other machines. This means that the process of adjusting the sewing thread tension of each machine is independent of each other, and the process of adjusting needs to be combined with the sewing of the cloth edge by edge, which has a high requirement on the operation ability of the operator, the adjustment process is time-consuming, there are many uncontrollable factors, and the cost of the garment factory cannot be reduced. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a sewing machine thread tension adjusting device and adjusting device control system, which is used to solve the problem that the size of thread tension needs to be frequently adjusted due to frequent change of clothes, and the size of thread tension does not have replicability and is limited by the skill of the operator.

[0005] To achieve the above-mentioned purpose, the utility model provides a sewing machine thread tension adjusting device, which is applied to a sewing machine. The thread tension adjusting device comprises a driving assembly, a thread clamp shaft, a thread tension spring assembly, a passive thread clamping assembly, an active thread clamping piece, an elastic body, and a pressure cap. One end of the thread clamp shaft is connected with the driving assembly. The end of the thread clamp shaft away from the driving assembly penetrates the thread tension spring assembly, the passive thread clamping assembly, the active thread clamping piece, and the elastic body in sequence and is connected with the pressure cap. The thread of the sewing machine is arranged between the active thread clamping piece and the passive thread clamping assembly. The thread tension spring assembly is fixedly arranged in the head of the sewing machine, and the passive thread clamping assembly is arranged in the thread tension spring assembly. The driving assembly drives the thread clamp shaft to move in the thread tension spring assembly along the axial direction. The thread clamp shaft drives the pressure cap, the elastic body, and the active thread clamping piece to move close to or away from the passive thread clamping assembly, and the thread tension of the thread between the active thread clamping piece and the passive thread clamping assembly is changed.

[0006] Preferably, the driving assembly comprises a linear motor and a connecting sleeve. The output end of the linear motor is connected with the thread clamp shaft through the connecting sleeve.

[0007] Preferably, the thread tension spring assembly comprises a thread tension spring base and a thread tension spring body, the thread tension spring base is a cylindrical hollow member, a through slot is formed on the outer circumferential surface of the thread tension spring base, the thread tension spring body is sleeved in the thread tension spring base, and the end of the thread tension spring body extends to the outside of the thread tension spring base through the through slot.

[0008] Preferably, the passive thread clamping assembly comprises a thread tension spring adjusting sleeve and a passive thread clamping piece, the thread tension spring adjusting sleeve is sleeved in the thread tension spring base and is fixedly connected with the thread tension spring base through the connecting piece, and the passive thread clamping piece is arranged at the end of the thread tension spring adjusting sleeve away from the thread tension spring base.

[0009] Preferably, the thread tension spring adjusting sleeve and the passive thread clamping piece are an integral piece or a split piece.

[0010] Preferably, the end surface of the active thread clamping piece close to the elastic body is a plane, and the end surface of the pressing cap close to the elastic body is a plane.

[0011] Preferably, the end surface of the active thread clamping piece close to the elastic body is a non-plane, a flat pad is further arranged between the active thread clamping piece and the elastic body, both end surfaces of the flat pad are planes, and the end surface of the pressing cap close to the elastic body is a plane.

[0012] Preferably, the sewing machine head is further provided with a positioning auxiliary tool, and the positioning auxiliary tool is used for positioning the thread tension adjusting device.

[0013] Preferably, the thread tension adjusting device further comprises a control module, the control module is in communication connection with the driving assembly, and is used for controlling the driving assembly to control the displacement amount of the thread clamping shaft in the axial direction.

[0014] In order to achieve the above object or other objects, the application further discloses a sewing machine thread tension adjusting device control system, which comprises a plurality of sewing machine thread tension adjusting devices as described above, the thread tension adjusting devices are provided with control modules, and further comprises a main machine module, the control modules in each thread tension adjusting device are extension modules, and the main machine module is in communication connection with the extension modules.

[0015] As described above, the sewing machine thread tension adjusting device and the adjusting device control system have the following beneficial effects:

[0016] 1. The sewing machine thread tension adjusting device and adjusting device control system, the size of the thread tension can be adjusted by the displacement of the driving assembly driving the thread clamp shaft in the axial direction, and the adjustment of the size of the thread tension can be digitized and quantified; accordingly, since the adjustment of the size of the thread tension can be digitized and quantified, the parameter data corresponding to different thread tensions can be copied, the dependence of the parameter setting on the high skill requirement of the operator in the prior art can be eliminated, the number of trial runs can be reduced, or trial runs are not required, and the copied parameters can be directly used.

[0017] 2. The sewing machine thread tension adjusting device and adjusting device control system, an elastic body is arranged between the cap and the driving thread pressing piece, and the elastic body serves as an adjusting medium to cooperate with the driving assembly to adjust the size of the thread tension.

[0018] 3. The sewing machine thread tension adjusting device and adjusting device control system, the two ends of the elastic body are respectively the driving thread clamp piece and the cap, and the end faces of the driving thread clamp piece and the cap close to the elastic body are smooth planes, so that the stress of the elastic body is uniform, the stability of the thread tension is ensured, the tension parameter required during sewing can be reduced, and the probability of needle skipping and thread breaking is effectively reduced.

[0019] 4. The sewing machine thread tension adjusting device and adjusting device control system, a positioning auxiliary tool is arranged on the sewing machine head and abuts against the initial position of the cap, so that the installation position of the thread tension adjusting device on each sewing machine is consistent, and the synchronization is improved.

[0020] 5. The sewing machine thread tension adjusting device and adjusting device control system, a control module is arranged in the thread tension adjusting device, the displacement of the driving assembly corresponding to different thread tensions can be input through the control module, and accordingly, the thread tension parameter value and parameter range corresponding to different fabrics can also be set through the control module, and data calling is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the sewing machine thread tension adjusting device of the utility model;

[0022] Figure 2 is an exploded view of the sewing machine thread tension adjusting device of the utility model; (the passive thread clamp assembly is an integral piece)

[0023] Figure 3 is an exploded view of the sewing machine thread tension adjusting device of the utility model; (the passive thread clamp assembly is a split piece)

[0024] Figure 4is the first connection schematic view of the active thread clamping piece and the elastic body in the sewing machine thread tension adjusting device of the utility model;

[0025] Figure 5 is the second connection schematic view of the active thread clamping piece and the elastic body in the sewing machine thread tension adjusting device of the utility model;

[0026] Figure 6 is the connection schematic view of the sewing machine thread tension adjusting device and the sewing machine head of the utility model.

[0027] Mark explanation:

[0028] 1, cap; 2, elastic body; 3, active thread clamping piece; 4, passive thread clamping assembly; 401, passive thread clamping piece; 402, thread tension spring adjusting sleeve; 5, thread tension spring base; 6, thread tension spring body; 7, thread clamp shaft; 8, connecting sleeve; 9, linear motor; 10, flat pad; 11, sewing machine head; 12, positioning auxiliary tool. Specific implementation

[0029] The following specific embodiments illustrate the implementation of the utility model, and those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification.

[0030] It is understood that the structure, proportion, size, etc. in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of the utility model, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that the utility model can produce, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like in the specification are only for clear description, and are not used to limit the scope of the utility model, and the change or adjustment of the relative relationship, without substantial change of technical content, is also regarded as the scope of the utility model.

[0031] For example, Figures 1-6As shown, the sewing machine thread tension adjusting device is applied to a sewing machine, and the thread tension adjusting device comprises a driving assembly, a thread clamp shaft 7, a thread tension spring assembly, a passive thread clamp assembly 4, an active thread clamp piece 3, an elastic body 2 and a pressure cap 1, the rear end of the thread clamp shaft 7 is connected with the driving assembly, the front end of the thread clamp shaft 7 is sequentially penetrated through the thread tension spring assembly, the passive thread clamp assembly 4, the active thread clamp piece 3, the elastic body 2 and is connected with the pressure cap 1, the sewing machine thread is arranged between the active thread clamp piece 3 and the passive thread clamp assembly 4, the thread tension spring assembly is fixedly arranged in the sewing machine head 11 through a connecting piece, and the passive thread clamp assembly 4 is arranged in the thread tension spring assembly; the driving assembly drives the thread clamp shaft 7 to move forward and backward along the axial direction in the thread tension spring assembly, the thread clamp shaft 7 drives the pressure cap 1, the elastic body 2 and the active thread clamp piece 3 to move close to or away from the passive thread clamp assembly 4, and the thread tension of the sewing machine thread between the active thread clamp piece 3 and the passive thread clamp assembly 4 is changed.

[0032] The sewing machine thread tension adjusting device drives the pressure cap 1 to move forward and backward along the axial direction through the thread clamp shaft 7, so that the pressure cap 1 drives the active thread clamp piece 3 to move close to or away from the passive thread clamp assembly 4 through the elastic body 2. When the active thread clamp piece 3 moves close to the passive thread clamp assembly 4, the sewing machine thread arranged between the active thread clamp piece 3 and the passive thread clamp assembly 4 is clamped, so that the thread tension is increased; when the active thread clamp piece 3 moves away from the passive thread clamp assembly 4, the sewing machine thread arranged between the active thread clamp piece 3 and the passive thread clamp assembly 4 is loosened, so that the thread tension is reduced, thereby realizing the adjustment of the thread tension, solving the problems that the thread tension needs to be frequently adjusted due to frequent replacement in the prior art, the adjustment of the thread tension does not have reproducibility and is limited by the skills of operators.

[0033] Preferably, as shown in Figures 1-3 The driving assembly comprises a linear motor 9 and a connecting sleeve 8, the output end of the linear motor 9 is connected with the thread clamp shaft 7 through the connecting sleeve 8, and the linear motor 9 is further provided with a driver and an encoder, and the driver and the encoder are used for controlling the displacement of the linear motor 9.

[0034] Preferably, as shown in Figure 2 , Figure 3 The thread tension spring assembly comprises a thread tension spring base 5 and a thread tension spring body 6, the thread tension spring base 5 is a cylindrical hollow piece, and a through groove is formed in the outer peripheral surface of the thread tension spring base 5; the thread tension spring body 6 is sleeved in the thread tension spring base 5, and the end portion of the thread tension spring body 6 extends to the outside of the thread tension spring base 5 through the through groove.

[0035] Preferably, as shown in Figure 2 , Figure 3As shown, the passive thread clamping assembly 4 comprises a thread tension spring adjusting sleeve 402 and a passive thread clamping piece 401. The rear end of the thread tension spring adjusting sleeve 402 is arranged in the thread tension spring base 5 and is fixedly connected with the thread tension spring base 5 through a connecting piece. The passive thread clamping piece 401 is arranged at the front end of the thread tension spring adjusting sleeve 402.

[0036] In the embodiment, the inner diameter of the thread tension spring base 5 is larger than the outer diameter of the thread tension spring body 6, and the inner diameter of the thread tension spring body 6 is larger than the outer diameter of the thread tension spring adjusting sleeve 402. Thus, the thread tension spring body 6 is arranged in the thread tension spring base 5, the rear end of the thread tension spring adjusting sleeve 402 is arranged in the thread tension spring base 5, and the thread tension spring body 6 is located on the outer circumferential surface of the thread tension spring adjusting sleeve 402. The thread tension spring base 5 is fixedly connected with the sewing machine head 11 through a connecting piece, and the thread tension spring adjusting sleeve 402 is fixedly connected with the thread tension spring base 5 through a connecting piece. Thus, when the driving assembly drives the thread clamp shaft 7 to move forward and backward along the axial direction, the pressure cap 1 will move forward and backward relative to the thread tension spring base 5 and the thread tension spring adjusting sleeve 402.

[0037] Preferably, as shown in Figure 2 , Figure 3 , the thread tension spring adjusting sleeve 402 and the passive thread clamping piece 401 are an integral piece or separate pieces. When the thread tension spring adjusting sleeve 402 and the passive thread clamping piece 401 are an integral piece, the passive thread clamping piece 401 is fixedly connected at the front end of the thread tension spring adjusting sleeve 402. When the thread tension spring adjusting sleeve 402 and the passive thread clamping piece 401 are separate pieces, the passive thread clamping piece 401 is arranged on the thread clamp shaft 7 and abuts against the front end surface of the thread tension spring adjusting sleeve 402.

[0038] Preferably, as shown in Figure 4 , the end surface of the active thread clamping piece 3 close to the elastic body 2 is a flat surface, and the end surface of the pressure cap 1 close to the elastic body 2 is a flat surface. In the embodiment, the reason why the front end surface of the active thread clamping piece 3 and the rear end surface of the pressure cap 1 are both arranged on a smooth flat surface is to ensure that when the elastic body 2 is compressed, the two ends of the elastic body 2 are in full surface contact with the flat surface, so that the force acting on the elastic body 2 is uniform, and the stability of the thread tension is ensured. When the force acting on the elastic body 2 is uniform and the thread tension is stable, the required tension value during sewing can be reduced, thereby reducing the probability of needle skipping and thread breakage.

[0039] As shown in Figure 5As shown, if the front end surface of the active thread clamping piece 3 and the rear end surface of the pressure cap 1 are non-planar, when the elastic body 2 is compressed, the position where the non-planar protruding part contacts the elastic body 2 is subjected to a large pressure, the position where the non-planar recessed part contacts the elastic body 2 is subjected to a small pressure, the clamping force of the thread between the active thread clamping piece 3 and the passive thread clamping piece 401 is uneven, and the thread tension is not stable enough. Therefore, when the front end surface of the active thread clamping piece 3 is non-planar, a flat pad 10 is further arranged between the active thread clamping piece 3 and the elastic body 2, both end surfaces of the flat pad 10 are rigid and planar, so as to realize uniform force of the elastic body 2 and ensure stable thread tension.

[0040] Preferably, as shown in the drawings, Figure 6 As shown, the sewing machine head 11 is further provided with a positioning auxiliary tool 12 for positioning the thread tension adjusting device. In the embodiment, the positioning auxiliary tool 12 is fixedly installed on the sewing machine head 11 by a connecting piece. The positioning auxiliary tool 12 can position the thread tension adjusting device in the following manner: when the output end of the linear motor 9 is completely retracted or completely extended, the position of the pressure cap 1 is aligned with the positioning auxiliary tool 12, so that the thread tension adjusting device can be installed at the expected position of the sewing machine head 11. The positioning auxiliary tool 12 is the basis for realizing rapid copying of thread tension parameters of multiple devices and parameter adjustment of Internet of Things in the later stage.

[0041] In the embodiment, the connecting piece can be a set screw. The pressure cap 1 is connected with the thread clamp shaft 7 by the set screw.

[0042] Preferably, in the embodiment, the thread tension adjusting device further comprises a control module, which is in communication connection with the driving assembly and is used to control the displacement amount of the thread clamp shaft 7 in the axial direction. The control module is in communication connection with the driver and the encoder of the linear motor 9. The driver is used to receive the control signal of the control module and convert the control signal into electric energy required for the operation of the linear motor 9, so as to drive the linear motor 9 to move in a specific direction. The encoder is used to detect the running state (for example, position, speed, acceleration, etc.) of the linear motor 9 and feed back the information to the control module. The control module receives the above information and compares it with the preset control parameters in the control module, so as to adjust the control signal sent to the driver, thereby realizing accurate control of the displacement amount of the linear motor 9, that is, adjusting the size of the thread tension.

[0043] Preferably, in the embodiment, the elastic body 2 can be a foam, a wave spring, a flat end spring or other elastic object.

[0044] To achieve the above object or other purposes, the utility model discloses a sewing machine thread tension adjusting device control system, including a plurality of as above sewing machine thread tension adjusting device, and be provided with control module in the thread tension adjusting device, still include the total machine module, and the control module in each thread tension adjusting device is all extension module, and the total machine module is connected with extension module communication.In this embodiment, when a plurality of sewing machines need to sew the same batch of fabric, the operator inputs the corresponding control parameters through the total machine module, the total machine module transmits the control parameters to the extension module in each sewing machine tension adjusting device, the extension module receives and identifies the control parameters, then controls the linear motor 9 to run the set displacement, realizes the adjustment to the thread tension size.In addition, when a certain sewing machine needs to sew different fabric, the operator can transmit the corresponding control parameters to the extension module of the sewing machine tension adjusting device through the total machine module alone, or can directly go to the sewing machine and input the corresponding control parameters into the extension module of the sewing machine tension adjusting device through the display screen and function key mode.

[0045] The sewing machine thread tension adjusting device related in the utility model, the operation steps are as follows:

[0046] S1: according to the attached Figures 1-6 And the description of each part, each part is produced to form the thread tension adjusting device, and then the assembled thread tension adjusting device is installed on the sewing machine head 11;

[0047] S2: the operator sets the thread tension required for sewing the fabric according to the parameters such as the material and thickness of the fabric;

[0048] S3: the control module receives the thread tension, and converts the thread tension into the displacement parameter of the linear motor 9, then inputs the corresponding control signal into the driver according to the displacement parameter of the linear motor 9, and the linear motor 9 works;The linear motor 9 drives the thread clamp shaft 7 to move forward and backward along the axial direction through the connecting sleeve 8, the pressure cap 1 at the front end of the thread clamp shaft 7 approaches or moves away from the elastic body 2, then the elastic body 2 approaches or moves away from the driving thread clamp sheet 3, and then the driving thread clamp sheet 3 approaches or moves away from the passive thread clamp sheet 401, and the thread tension between the driving thread clamp sheet 3 and the passive thread clamp sheet 401 is adjusted;

[0049] S4: when the linear motor 9 drives the thread clamp shaft 7 to move forward and backward along the axial direction, the encoder monitors the displacement of the linear motor 9 in real time, when the displacement parameter of the linear motor 9 reaches the linear motor 9 displacement parameter set in step S3, the encoder feeds back the signal to the control module, the control module sends the control signal to the driver, and the movement of the linear motor 9 is stopped, and the stability of the thread tension is maintained;

[0050] S5: the operator places the fabric on the worktable of the sewing machine, starts the sewing machine to sew the fabric, and the fabric is sewn with a set thread tension.

[0051] Preferably, when the thread tension adjusting device is installed on the sewing machine head 11 in step S1, the positioning auxiliary tool 12 is needed to ensure that the distance between the initial position of the pressure cap 1 in each thread tension adjusting device and the sewing machine head 11 is basically the same (or within the error range), so that the same parameters can be input, the pressure cap 1 can move the same displacement, and the corresponding thread tension is the same.

[0052] Preferably, in step S2, the thread tension parameters corresponding to fabrics of different materials and thicknesses can be stored in the control module and directly called when needed. When sewing new products, the thread tension parameters need to be adjusted for the first time, and the adjusted thread tension parameters are directly stored in the control module for subsequent use.

[0053] Preferably, in step S3, when multiple sewing machines sew the same batch of fabric and the same parameters need to be set for the thread tension adjusting devices of each sewing machine, the operator can send the thread tension parameters to the control system of the thread tension adjusting device of each sewing machine through the main machine module, which has high automation, and since the positioning auxiliary tool 12 is used when installing the thread tension adjusting device, the parameters sent by the main machine module are applicable to the thread tension adjusting devices of each sewing machine.

[0054] Preferably, in step S3, when a sewing machine sews fabrics of different materials and thicknesses, the operator can input the corresponding displacement parameters to the control module of the thread tension adjusting device of the sewing machine through the main machine module, or walk to the sewing machine and input the corresponding displacement parameters to the control module through the display screen and function keys.

[0055] Preferably, in step S3, when the linear motor 9 drives the pressure cap 1 to move backward, the pressure cap 1 compresses the elastic body 2, and then the elastic body 2 actively pushes the active clamping piece 3 backward to the passive clamping piece 401, the thread between the active clamping piece 3 and the passive clamping piece 401 is clamped, that is, the thread tension between the active clamping piece 3 and the passive clamping piece 401 increases; when the linear motor 9 drives the pressure cap 1 to move forward, the pressure cap 1 moves forward away from the elastic body 2, and the elastic body 2 will not exert pressure on the active clamping piece 3, that is, the active clamping piece 3 will not exert pressure on the passive clamping piece 401, that is, the thread between the active clamping piece 3 and the passive clamping piece 401 will not be clamped, and the thread tension between the active clamping piece 3 and the passive clamping piece 401 decreases, so by adjusting the displacement of the linear motor 9, the size of the thread tension can be adjusted.

[0056] The sewing machine thread tension adjusting device and the adjusting device control system of the utility model relate to, through the adjustment of linear motor 9 displacement, realize to the face line thread tension size adjustment, and the displacement of linear motor 9 can be digitized, quantified through control module, so different thread tension size corresponding parameter data can be copied, get rid of the dependence problem of parameter setting in prior art on the higher skill requirement of operator.This utility model in elastomer 2 both ends are respectively active clamp thread piece 3, and pressure cap 1, active clamp thread piece 3, pressure cap 1 close to the end face of elastomer 2 are smooth plane, so make the stress of elastomer 2 uniform, guarantee the stability of thread tension, the tension parameter that can reduce the need of setting during sewing, effectively reduce the probability of needle skipping, broken thread.The utility model can realize the parameterization stepless adjustment of thread tension copyable when changing money, improve the change money efficiency.

[0057] In summary, the utility model effectively overcomes the various shortcomings in the prior art and has high industrial utilization value.

[0058] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A sewing machine thread tension adjustment device for use on a sewing machine; characterized by: The thread tension adjusting device comprises a driving assembly, a thread clamp shaft (7), a thread tension spring assembly, a passive thread clamp assembly (4), an active thread clamp (3), an elastic body (2), and a pressure cap (1), one end of the thread clamp shaft (7) is connected with the driving assembly, the end of the thread clamp shaft (7) away from the driving assembly is sequentially penetrated through the thread tension spring assembly, the passive thread clamp assembly (4), the active thread clamp (3), the elastic body (2), and then connected with the pressure cap (1); the sewing machine thread is arranged between the active thread clamp (3) and the passive thread clamp assembly (4). The thread tension spring assembly is fixedly arranged in the sewing machine head (11), and the passive thread clamp assembly (4) is arranged in the thread tension spring assembly; the driving assembly drives the thread clamp shaft (7) to move in the axial direction in the thread tension spring assembly, the thread clamp shaft (7) drives the pressure cap (1), the elastic body (2), and the active thread clamp (3) to move close to or away from the passive thread clamp assembly (4), and the thread tension of the thread between the active thread clamp (3) and the passive thread clamp assembly (4) is changed.

2. The sewing machine thread tension adjuster of claim 1, wherein: The driving assembly comprises a linear motor (9) and a connecting sleeve (8), and the output end of the linear motor (9) is connected with the thread clamp shaft (7) through the connecting sleeve (8).

3. The sewing machine thread tension adjuster of claim 1, wherein: The thread tension spring assembly comprises a thread tension spring base (5) and a thread tension spring body (6), the thread tension spring base (5) is a cylindrical hollow member, and a through groove is formed in the outer peripheral surface of the thread tension spring base (5); the thread tension spring body (6) is sleeved in the thread tension spring base (5), and the end portion of the thread tension spring body (6) extends to the outside of the thread tension spring base (5) through the through groove.

4. The sewing machine thread tension adjuster of claim 1, wherein: The passive thread clamp assembly (4) comprises a thread tension spring adjusting sleeve (402) and a passive thread clamp (401), the thread tension spring adjusting sleeve (402) is sleeved in the thread tension spring base (5) and is fixedly connected with the thread tension spring base (5) through a connecting member; the passive thread clamp (401) is arranged at the end portion of the thread tension spring adjusting sleeve (402) away from the thread tension spring base (5).

5. The sewing machine thread tension adjuster of claim 4, wherein: The thread tension spring adjusting sleeve (402) and the passive thread clamp (401) are an integral piece or separate pieces.

6. The sewing machine thread tension adjuster of claim 1, wherein: The end surface of the active thread clamp (3) close to the elastic body (2) is a plane, and the end surface of the pressure cap (1) close to the elastic body (2) is a plane.

7. The sewing machine thread tension adjuster of claim 1, wherein: The end surface of the active thread clamp (3) close to the elastic body (2) is a non-plane, and a flat pad (10) is further arranged between the active thread clamp (3) and the elastic body (2), both end surfaces of the flat pad (10) are planes; and the end surface of the pressure cap (1) close to the elastic body (2) is a plane.

8. The sewing machine thread tension adjuster of claim 1, wherein: The sewing machine head (11) is further provided with a positioning auxiliary tool (12), and the positioning auxiliary tool (12) is used for positioning the thread tension adjusting device.

9. The sewing machine thread tension adjuster of claim 1, wherein: The thread tension adjusting device further comprises a control module, the control module is in communication connection with the driving assembly, and is used for controlling the displacement amount of the thread clamp shaft (7) in the axial direction by the driving assembly.

10. A control system for a plurality of sewing machine thread tension regulator devices as claimed in any one of claims 1 to 9, said thread tension regulator devices being provided with a control module; characterised in that: Further comprising a main machine module, the control module in each thread tension adjusting device is a sub-machine module, and the main machine module is in communication connection with the sub-machine module.

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