An electronic thread clamp and a sewing machine

Abstract

This invention relates to an electronic thread tensioner and a sewing machine. The electronic thread tensioner includes a thread tension base, a first coil, and a thread tension plate. The thread tension base includes an iron core and a housing surrounding the iron core, forming a cavity between the iron core and the housing. The first coil is fitted onto the iron core and located within the cavity. A thread tensioning surface is provided at the end of the iron core, and the thread tension plate abuts against the thread tensioning surface. Both the thread tension base and the thread tension plate are made of ferromagnetic material, and when the first coil is energized, the thread tension plate is attracted to the thread tensioning surface of the thread tension base. The face thread of the electronic thread tensioner passes between the thread tension plate and the thread tensioning surface of the thread tension base. The electronic thread tensioner of this invention adjusts the tension of the face thread by controlling the input current of its first coil. It has a simple structure, fast response speed, and very low actual operating current, thus avoiding significant temperature rise.

Description

Technical Field

[0001] This invention relates to the field of sewing equipment, and more specifically to an electronic thread clamp and a sewing machine. Background Technology

[0002] When sewing fabric, a sewing machine uses a rotary hook and needle to interlock and stitch the bobbin thread and top thread. To create good stitches, the tension of both the bobbin and top thread must be appropriate. Traditional sewing machines adjust the top thread tension by manually rotating a knob to compress a spring. However, for fabrics of different thicknesses, the knob must be rotated again to adjust the spring compression and thus the top thread tension. This is repetitive, inefficient, and due to the large margin of error in manual adjustment, the top thread tension is not precisely controlled, resulting in poor stitch quality.

[0003] To achieve automatic adjustment of sewing machine thread tension, electronic thread clamps are currently available on the market that use push-pull electromagnets or stepper motors in conjunction with a series of mechanical structures to compress tower springs and clamp the thread, thus achieving tension adjustment. However, these methods have drawbacks such as slow response speed, inability to achieve real-time adjustment, severe overheating of the electromagnet, which greatly affects the adjustment accuracy, complex structure, and high cost. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide an electronic thread tensioner and a sewing machine that can adjust the tension of the sewing thread by controlling its average input current. The thread tension control is highly accurate, the response is rapid, and the current is very low, so that there is no significant temperature rise.

[0005] To achieve the above objectives, the present invention provides an electronic wire clamp, including a wire clamp base, a first coil, and a wire clamping plate; the wire clamp base includes an iron core and a shell surrounding the iron core, forming a receiving cavity between the iron core and the shell, the first coil being sleeved on the iron core and located in the receiving cavity, the iron core having a wire clamping surface at its end, the wire clamping plate being in contact with the wire clamping surface, both the wire clamp base and the wire clamping plate being made of ferromagnetic material, and when the first coil is energized, the wire clamping plate is attracted to the wire clamping surface of the wire clamp base.

[0006] Furthermore, the clamping piece and the clamping seat always remain in contact.

[0007] Furthermore, the upper end of the clamping piece is hinged to the clamping seat.

[0008] Furthermore, it also includes a wire-blocking rod, one end of which is inserted into the wire-clamping surface of the iron core, and the other end extends into the wire-clamping plate.

[0009] Furthermore, it also includes a wire release drive mechanism, which is capable of driving the wire clamping plate to separate from the wire clamping surface of the wire clamping seat.

[0010] Furthermore, the wire loosening drive mechanism includes a magnetic outer sleeve fixed to the side of the wire clamping plate away from the wire clamping seat, a second coil fixedly disposed in the magnetic outer sleeve, a push rod disposed in the second coil, and a magnetic retaining ring disposed in the magnetic outer sleeve. The second coil is located between the wire clamping plate and the magnetic retaining ring. One end of the push rod passes through the wire clamping plate and is used to abut against the wire clamping seat. The magnetic outer sleeve, the push rod, and the magnetic retaining ring are all made of ferromagnetic material. When the second coil is energized, the push rod moves toward the wire clamping seat and can support itself on the wire clamping seat.

[0011] Furthermore, a connecting hole is provided on the clamping surface of the wire clamping seat, and the end of the push rod facing the wire clamping seat is inserted into the connecting hole on the clamping surface.

[0012] Furthermore, it also includes a magnetic tube disposed within the second coil, and the magnetic tube is made of ferromagnetic material, through which the push rod passes.

[0013] Furthermore, the section of the push rod located inside the second coil is provided with a conical portion, and the conical surface of the conical portion faces the clamping plate. The end of the magnetic tube is provided with a conical cavity adapted to the conical portion, and the conical portion is located in the conical cavity.

[0014] The present invention also provides a sewing machine, including a small thread clamp assembly and a fixed thread catch hook, and further including the above-mentioned electronic thread clamp. After the sewing machine thread passes through the small thread clamp assembly, it enters between the thread clamping plate and the thread clamping surface of the electronic thread clamp and passes around the thread stop bar, then passes around the thread take-up spring of the electronic thread clamp, and then passes through the fixed thread catch hook.

[0015] As described above, the electronic thread clamp and sewing machine of the present invention have the following beneficial effects:

[0016] The electronic thread tensioner comprises a thread clamping base, a first coil, and a clamping plate. In use, the thread passes between the clamping plate and the clamping surface. When thread tension is required, the first coil is energized, generating a magnetic attraction between the clamping plate and the clamping base. The clamping plate adheres tightly to the clamping surface, thus clamping the thread. The tension of the clamped thread during sewing is directly proportional to the clamping force between the clamping plate and the clamping surface. When thread tension needs to be controlled, only the current in the first coil needs to be adjusted. Furthermore, because the first coil is located within a cavity formed between the iron core and the outer shell, creating a relatively enclosed space, the energized first coil forms a closed loop current within it. This significantly enhances the magnetism of the iron core and the outer shell, generating a large attraction force even with a relatively small current. The electronic thread tensioner of this invention adjusts the tension of the opposite thread by controlling the input current of its first coil. It has a simple structure and fast response speed, and can achieve a tension adjustment speed much shorter than the sewing cycle of each stitch, thus providing new possibilities for sewing machine sewing control technology. It can also generate a large clamping force with a small current, and the actual working current is very low, so there will be no significant temperature rise. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the electronic wire clamp of the present invention.

[0018] Figure 2 This is an exploded view of the structure of an embodiment of the electronic wire clamp of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of a second embodiment of the electronic wire clamp of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the electronic wire clamp of the present invention, embodiment three.

[0021] Figure 5 This is an exploded view of the structure of the electronic wire clamp of the present invention, embodiment three.

[0022] Figure 6 This is a schematic diagram of the installation of the electronic thread clamp of the present invention on a sewing machine according to Embodiment 3.

[0023] Component designation explanation

[0024] 1. Wire clamp

[0025] 1a Iron core

[0026] 1b Outer shell

[0027] 1c accommodating cavity

[0028] 1d sandwich surface

[0029] 1e Connecting Ear Block

[0030] 2 First coil

[0031] 3. Wire clips

[0032] 4. Line stop bar

[0033] 5. Thread take-up spring

[0034] 6 pins

[0035] 7 Second coil

[0036] 8. Magnetic outer jacket

[0037] 9. Magnetic retaining ring

[0038] 10. Magnetic tube

[0039] 11 Protective casing

[0040] 12 putter

[0041] 12a Conical part

[0042] 13 Small wire clamp components

[0043] 14 Fixed welt hook

[0044] 15. Chassis Detailed Implementation

[0045] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0046] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0047] See Figures 1 to 6This invention provides an electronic wire clamp, including a wire clamp base 1, a first coil 2, and a wire clamping plate 3. The wire clamp base 1 includes an iron core 1a and a shell 1b surrounding the iron core 1a, forming a receiving cavity 1c between the iron core 1a and the shell 1b. The first coil 2 is fitted onto the iron core 1a and located in the receiving cavity 1c. The end of the iron core 1a has a wire clamping surface 1d, and the wire clamping plate 3 is in contact with the wire clamping surface 1d. Both the wire clamp base 1 and the wire clamping plate 3 are made of ferromagnetic materials that magnetize and demagnetize quickly, and when the first coil 2 is energized, the wire clamping plate 3 is attracted to the wire clamping surface 1d of the wire clamp base 1. The wire clamp base 1 and the wire clamping plate 3 can both be made of ferromagnetic materials such as soft iron, which have the characteristics of fast magnetization and demagnetization. The electronic wire clamp generally also includes a take-up spring 5 to help take in the wire and make the top and bottom threads even.

[0048] The basic working principle of the electronic thread tensioner involved in this invention is as follows: In use, the electronic thread tensioner is installed in the position of the conventional thread tensioner on the housing 15. The sewing machine's top thread passes between the tension plate 3 and the tension surface 1d, and after passing through, it bypasses the take-up spring 5, which is used to carry the top thread. When top thread tension is required, the first coil 2 is energized, the tension seat 1 and the tension plate 3 are magnetized, and a magnetic attraction is generated between the tension plate 3 and the tension seat 1. The tension plate 3 is attracted to the tension surface 1d, thereby clamping the top thread. The tension of the clamped top thread during the sewing process is directly proportional to the clamping force between the tension plate 3 and the tension surface 1d. Tests have shown that the tension in the sewing thread is directly proportional to the current in the first coil 2 within the commonly used range. When it is necessary to control the thread tension, it is only necessary to adjust the current in the first coil 2. The current control can be achieved through an adjustable constant current source circuit or through pulse width modulation. Furthermore, since the first coil 2 is located in the cavity 1c formed between the iron core 1a and the outer shell 1b, the cavity 1c forms a relatively enclosed space. When the first coil 2 is energized, the generated magnetic field forms a complete closed loop through the integrated outer shell 1b and iron core 1a, as well as the clamping plate 3 pressing on it, thereby generating a large attraction force between the clamping plate 3 and the iron core 1a / outer shell 1b. When a section of sewing is completed and the thread needs to be loosened, it is only necessary to reduce the current in the first coil 2 to zero, and the clamping seat 1 and the clamping plate 3 quickly demagnetize, and the clamping force between the clamping plate 3 and the clamping surface 1d is lost. Due to the magnetization characteristics of ferromagnetic materials and modern current control technology, the response speed of thread tension adjustment can be ensured to be much less than milliseconds.

[0049] The electronic thread tensioner of the present invention adjusts the tension of the opposite thread by controlling the input current of its first coil 2. It has a simple structure and fast response speed, and can achieve a tension adjustment speed much shorter than the sewing cycle of each stitch, thus providing new possibilities for sewing machine sewing control technology. It can also generate a large clamping force with a small current, and the actual working current is very low, so there will be no significant temperature rise.

[0050] See Figures 1 to 5 The electronic wire clamp of the present invention will be further described below with reference to several specific embodiments:

[0051] Example 1:

[0052] See Figure 1 and Figure 2 This is a schematic diagram of the structure of this embodiment. In this embodiment, as a preferred design, the clamping piece 3 and the clamping seat 1 are always in contact to improve the clamping force after magnetization. Specifically, the clamping seat 1 has a connecting lug 1e at the upper end of the outer shell 1b. A pin 6 passes through the upper end of the clamping piece 3 and the connecting lug 1e, thereby hinged the upper end of the clamping piece 3 to the clamping seat 1, and the clamping piece 3 can rotate relative to the clamping seat 1 to separate from the clamping surface 1d. With this method, since the clamping piece 3 and the clamping seat 1 can always maintain contact, the magnetization effect of the first coil 2 when magnetizing the clamping piece 3 and the clamping seat 1 is better. Furthermore, when the clamping is loosened, the clamping piece 3 and the clamping seat 1 can rotate relative to each other around the pin 6, and the clamping piece 3 separates from the clamping surface 1d, completely releasing the clamping of the face wire, and facilitating the removal of the face wire. Using the aforementioned hinged connection, the clamping piece 3 can automatically rotate downwards and return to its original position under gravity. This ensures that even when the first coil 2 is not energized, the clamping piece 3 and the clamping seat 1 remain in contact, thereby guaranteeing better adhesion between the clamping piece 3 and the clamping seat 1 after the first coil 2 is energized. Preferably, when the clamping piece 3 contacts the clamping surface 1d, it also contacts the end face of the outer casing 1b, thereby increasing the clamping force. Of course, since the distance between the clamping seat 1 and the clamping piece 3 is very small when the wire is loosened, in other embodiments, if the clamping seat 1 and the clamping piece 3 do not employ the aforementioned hinged connection, they can still be brought together and tightened under magnetic attraction.

[0053] In this embodiment, see Figure 1 and Figure 2 As a preferred design, a wire stop rod 4 is also included. One end of the wire stop rod 4 is inserted into the wire clamping surface 1d of the iron core 1a, and the other end extends into the wire clamping plate 3. When the wire clamping plate 3 and the wire clamping seat 1 rotate relative to each other, the wire stop rod 4 always remains in the iron core 1a and the wire clamping plate 3. Specifically, in this embodiment, a threaded hole is provided on the wire clamping surface 1d of the iron core 1a. One end of the wire stop rod 4 is screwed into the threaded hole, and the other end of the wire stop rod 4 extends into a connecting hole provided on the wire clamping plate 3. The size of the connecting hole is slightly larger than the diameter of the part of the wire stop rod 4 that extends into it. In this way, when the wire clamping plate 3 rotates upward relative to each other a certain distance, it can ensure that the wire stop rod 4 is not easily dislodged from the wire clamping plate 3 and does not hinder the upward rotation of the wire clamping plate 3. The purpose of the line stop bar 4 is to prevent the top thread from coming out between the clamping plate 3 and the clamping surface 1d. When using it, the top thread should pass around the line stop bar 4 when passing between the clamping plate 3 and the clamping surface 1d. When picking up the thread, the line stop bar 4 can block the top thread, thereby preventing it from coming out between the clamping plate 3 and the clamping surface 1d.

[0054] Since some sewing machine models do not require thread loosening, the electronic thread clamp in this embodiment can be used. In this case, a mechanism for separating the thread clamping piece 3 from the thread clamping surface 1d is not required.

[0055] Example 2:

[0056] See Figure 3 This is a schematic diagram of the structure of this embodiment. This embodiment is basically the same as that of embodiment one, except that the installation method of the wire stop rod 4 is different. In this embodiment, the wire stop rod 4 adopts the opposite installation method to that in embodiment one. Specifically, one end of the wire stop rod 4 is screwed into the wire clamping piece 3, and the other end extends into a connecting hole opened on the wire clamping surface 1d. The size of the connecting hole is slightly larger than the diameter of the part of the wire stop rod 4 that extends into it. Its working principle is also basically the same as that of embodiment one.

[0057] Example 3:

[0058] See Figure 4 and Figure 5 This is a schematic diagram of the structure of this embodiment. This embodiment is an improvement on Embodiment 1, which adds a wire loosening drive mechanism located on the rear side of the wire clamping piece 3 (for ease of explanation, the side where the wire clamping seat 1 is located is the front side, and the side where the wire clamping piece 3 is located is the rear side). The wire loosening drive mechanism is used to drive the wire clamping piece 3 to separate from the wire clamping surface 1d of the wire clamping seat 1, and has a wire blocking rod 4 with a different structure. The structures of the wire clamping seat 1, the first coil 2, and the wire clamping piece 3 are the same as those in Embodiment 1, so they will not be described again.

[0059] In this embodiment, see Figure 4 and Figure 5As a preferred design, the wire release drive mechanism includes a magnetic outer sleeve 8 fixed to the side (rear side) of the wire clamping plate 3 away from the wire clamping seat 1, a second coil 7 fixedly disposed in the magnetic outer sleeve 8, a push rod 12 disposed in the second coil 7, and a magnetic retaining ring 9 disposed in the magnetic outer sleeve 8. The second coil 7 is located between the wire clamping plate 3 and the magnetic retaining ring 9. Specifically, both ends of the second coil 7 abut against the wire clamping plate 3 and the magnetic retaining ring 9, respectively. The magnetic retaining ring 9 is fixed axially and abuts against the inner wall of the magnetic outer sleeve 8, thereby limiting the axial upward position of the second coil 7. The front end of the push rod 12 passes through the wire clamping plate 3 and is used to abut against the wire clamping seat 1. The magnetic outer sleeve 8, the push rod 12, and the magnetic retaining ring 9 are all made of ferromagnetic materials such as soft iron. When loosening the wire is required, the first coil 2 is de-energized, and the second coil 7 is energized. The push rod 12 and the magnetic sleeve 8 are magnetized. Under the action of the magnetic force, the push rod 12 moves relative to the second coil 7, moving towards the wire clamp 1 and supporting it, thereby separating the wire clamp 3 from the wire clamping surface 1d. Furthermore, the second coil 7 is energized within a relatively enclosed space formed by the wire clamp 3, the magnetic sleeve 8, and the magnetic retaining ring 9. When the second coil 7 is energized, the generated magnetic field forms a closed magnetic circuit through the magnetic sleeve 8, the magnetic retaining ring 9, and the push rod 12. The push rod 12 (push-pull iron core) has a large pushing force due to the inner cavity of the second coil 7 and the magnetic field gradient, thus smoothly pushing the wire clamp 1 and separating the wire clamp 3 from the wire clamping surface 1d. After the second coil 7 is de-energized, the wire-blocking rod 4, the wire-clamping piece 3, the magnetic outer sleeve 8, and the magnetic retaining ring 9 are quickly demagnetized. The push rod 12 loses its pushing force, and under the action of gravity, the wire-clamping seat 1 and the wire-clamping piece 3 return to the state of being close together.

[0060] In this embodiment, see Figure 4 and Figure 5 As a preferred design, the end of the push rod 12 facing the wire clamping seat 1 is inserted into the connecting hole opened on the wire clamping surface 1d to form the wire blocking rod 4, which is used for the wire to pass around. Its structure and function are the same as those in Embodiment 1.

[0061] In this embodiment, the magnetic outer sleeve 8 and the wire clamping piece 3 are preferably integrated, which facilitates manufacturing. The magnetic retaining ring 9 is installed in the magnetic outer sleeve 8 in a detachable manner. Specifically, it can be snapped in place using a combination of a locking block and a locking slot, facilitating the installation of the second coil 7 and the push rod 12 into the magnetic outer sleeve 8. In this embodiment, a wire-picking spring 5 is included. The wire-picking spring 5 is a torsion spring structure, fitted onto the magnetic outer sleeve 8, with its wire-picking hook extending to an appropriate position.

[0062] In this embodiment, see Figure 4 and Figure 5As a preferred design, the system also includes a magnetic tube 10 disposed within the second coil 7. The magnetic tube 10 is made of ferromagnetic material. The push rod 12 passes through the magnetic tube 10. When the second coil 7 is energized, the magnetic tube 10 increases the magnetic field strength within the magnetic outer sleeve 8, strengthens the magnetic field gradient, and enhances the magnetization effect on the wire-blocking rod 4. Simultaneously, the magnetic tube 10 is also magnetized, generating an attractive force with the wire-blocking rod 4, thereby increasing the forward pushing force of the wire-blocking rod 4. Furthermore, the section of the push rod 12 located within the second coil 7 has a conical portion 12a, with the conical surface of the conical portion 12a facing the wire-clamping piece 3. That is, the front of the conical portion 12a is smaller than the rear. The end of the magnetic tube 10 has a conical cavity adapted to the conical portion 12a, and the conical portion 12a is located within the conical cavity. By providing the conical cavity, the magnetic tube 10 can enhance the magnetic field gradient at this location, thereby further increasing the forward pushing force of the wire-blocking rod 4.

[0063] The wire loosening drive mechanism in this embodiment, by setting a second coil 7, a magnetic outer sleeve 8, a magnetic retaining ring 9, a magnetic tube 10 and a push rod 12, enables the push rod 12 to smoothly push the wire clamping piece 3 to separate from the wire clamping surface 1d of the wire clamping seat 1 when the second coil 7 is in a small current, thereby loosening the wire. Its structure is simple, the response speed is fast, and the actual working current is very low, so there will be no significant temperature rise.

[0064] In this embodiment, see Figure 4 and Figure 5 As a preferred design, it also includes a protective cover 11 fixed to the rear side of the wire clamping piece 3. The wire release drive mechanism is located inside the protective cover 11. The protective cover 11 can be made of plastic material, which protects the wire release drive mechanism located inside it and can be positioned behind the push rod 12 to prevent the push rod 12 from coming out of the second coil 7. The range of motion of the push rod 12 is determined by the magnetic tube 10 and the protective cover 11.

[0065] The present invention also provides a sewing machine, see [link to sewing machine]. Figure 6 It includes a small wire clamp assembly 13 and a fixed wire hook 14, and also includes the electronic wire clamp described above. Figure 6The embodiment shown specifically uses the electronic thread clamp from Embodiment 3 above. It is fixed to the conventional thread clamp position on the housing 15 by screws, with the thread clamping base 1 facing inwards from the housing 15 and the protective cover 11 facing outwards. The power supply to the first coil 2 and the second coil 7 in the electronic thread clamp is controlled by the sewing machine's main control system. The sewing machine's thread passes through the hole in the small thread clamp assembly 13, enters the space between the thread clamping plate 3 and the coil housing 1b of the electronic thread clamp, passes around the thread guide bar 4, then around the thread take-up spring 5 of the electronic thread clamp, and finally passes through the fixed thread hook 14. When the sewing machine is in normal sewing mode, according to the fabric and sewing requirements, the main control system of the sewing machine adjusts the current of the first coil 2 in the electronic thread clamp, thereby adjusting the attraction force between the thread clamping surface 1d of the thread clamping seat 1 and the thread clamping piece 3, thus realizing real-time automatic and controllable adjustment of the thread tension. When the sewing machine needs to cut the thread to loosen it, the main control system of the sewing machine disconnects the power supply of the first coil 2 and connects the power supply of the second coil 7. The push rod 12 is pushed inward to completely separate the thread clamping piece 3 from the thread clamping surface 1d of the thread clamping seat 1, thereby achieving the function of cutting and loosening the thread.

[0066] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An electronic wire clamp, characterized in that: The device includes a wire clamp (1), a first coil (2), and a wire clamping plate (3). The wire clamp (1) includes an iron core (1a) and a shell (1b) surrounding the iron core (1a). A cavity (1c) is formed between the iron core (1a) and the shell (1b). The first coil (2) is fitted onto the iron core (1a) and located in the cavity (1c). The iron core (1a) has a wire clamping surface (1d) at its end. The wire clamping plate (3) is in contact with the wire clamping surface (1d). Both the wire clamp (1) and the wire clamping plate (3) are made of ferromagnetic material. When the first coil (2) is energized, the wire clamping plate (3) is attracted to the wire clamping surface (1d) of the wire clamp (1). The device also includes a wire release driving mechanism, which can drive the wire clamping plate (3) to engage with the wire clamping surface (1d) of the wire clamp (1). The clamping surfaces (1d) of the wire holder (1) are separated; the wire loosening drive mechanism includes a magnetic outer sleeve (8) fixed to the side of the clamping plate (3) away from the clamping seat (1), a second coil (7) fixedly disposed in the magnetic outer sleeve (8), a push rod (12) disposed in the second coil (7), and a magnetic retaining ring (9) disposed in the magnetic outer sleeve (8). The second coil (7) is located between the clamping plate (3) and the magnetic retaining ring (9). One end of the push rod (12) passes through the clamping plate (3) and is used to abut against the clamping seat (1). The magnetic outer sleeve (8), the push rod (12) and the magnetic retaining ring (9) are all made of ferromagnetic material. When the second coil (7) is energized, the push rod (12) moves toward the clamping seat (1) and can support the clamping seat (1).

2. The electronic wire clamp according to claim 1, characterized in that: The clamping piece (3) and the clamping seat (1) are always in contact.

3. The electronic wire clamp according to claim 2, characterized in that: The upper end of the clamping piece (3) is hinged to the clamping seat (1).

4. The electronic wire clamp according to claim 1, characterized in that: It also includes a wire stop bar (4), one end of which is inserted into the wire clamping surface (1d) of the iron core (1a) and the other end extends into the wire clamping piece (3).

5. The electronic wire clamp according to claim 1, characterized in that: The clamping surface (1d) of the clamping seat (1) is provided with a connecting hole, and the end of the push rod (12) facing the clamping seat (1) is inserted into the connecting hole on the clamping surface (1d).

6. The electronic wire clamp according to claim 1, characterized in that: It also includes a magnetic tube (10) disposed in the second coil (7), and the magnetic tube (10) is made of ferromagnetic material, and the push rod (12) passes through the magnetic tube (10).

7. The electronic wire clamp according to claim 6, characterized in that: The push rod (12) has a conical part (12a) in the section inside the second coil (7), and the conical surface of the conical part (12a) faces the clamping plate (3). The end of the magnetic tube (10) has a conical cavity adapted to the conical part (12a), and the conical part (12a) is located in the conical cavity.

8. A sewing machine comprising a small thread clamp assembly (13) and a fixed thread catch (14), characterized in that: It also includes an electronic thread clamp as described in any one of claims 1 to 7, wherein the sewing machine thread passes through the small thread clamp assembly (13), enters between the thread clamping plate (3) and the thread clamping surface (1d) of the electronic thread clamp and passes around the thread stop bar (4), then passes around the thread take-up spring (5) of the electronic thread clamp, and then passes through the fixed thread hook (14).

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