Thread clamp assembly for a sewing machine and sewing machine

Abstract

The utility model discloses a sewing machine is with thread clamp assembly and sewing machine, sewing machine is with thread clamp assembly includes electromagnet, and electromagnet includes electromagnet body and moving iron core, and electromagnet body is fixed in one side of mounting panel, and the one end of moving iron core passes through mounting panel and is at the other side of mounting panel and is fixed with the thread passing joint axle, and the first thread clamp piece, second thread clamp piece and pressure -bearing cover of close -fit mounting panel are sequentially covered and are established on the thread passing joint axle, and the thread passing joint axle still is fixed with the stop ring of close -fit first thread clamp piece and is used for the location of first thread clamp piece, and the clearance between first thread clamp piece and second thread clamp piece is used for the setting of sewing thread, through the electrification of electromagnet body, make moving iron core drive stop ring first thread clamp piece and exert pressure to first thread clamp piece, and the sewing thread is clamped between first thread clamp piece and second thread clamp piece.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, specifically relating to a thread clamp assembly for a sewing machine and a sewing machine. Background Technology

[0002] Sewing machines rely heavily on thread tensioners during the sewing process. Thread tensioners provide tension to the thread by clamping it, thus ensuring better sewing quality.

[0003] Conventional thread tensioners typically use spring compression to clamp the thread. However, due to significant differences in the quality of different springs, the resulting tension on the thread varies, making it difficult to guarantee better sewing quality. Furthermore, using spring compression to clamp the thread is a purely mechanical operation that cannot digitally adjust the clamping force applied to the thread. With the rapid development of digitalization in the sewing industry, the need for digital adjustment of the clamping force applied to the thread is becoming increasingly apparent. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the present invention provides a thread clamping device assembly for a sewing machine and a sewing machine, which facilitates the adjustment of the clamping force applied to the thread, thereby facilitating the adjustment of the tension provided to the thread, and has high adjustment accuracy.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A thread clamp assembly for a sewing machine includes an electromagnet. The electromagnet includes an electromagnet body and a movable iron core that passes through the electromagnet body and is axially movable relative to the electromagnet body. The electromagnet body is fixed to one side of a mounting plate. One end of the movable iron core passes through the mounting plate and is located on the other side of the mounting plate, where a thread guide shaft is fixed. A first thread clamping plate, a second thread clamping plate, and a pressure cover that is close to the mounting plate are sequentially sleeved on the thread guide shaft. A retaining ring that is close to the first thread clamping plate and is used to limit the position of the first thread clamping plate is also fixed on the thread guide shaft. The gap between the first and second thread clamping plates is used for threading. When the electromagnet body is energized, the movable iron core drives the retaining ring through the thread guide shaft to apply pressure to the first thread clamping plate and clamp the thread between the first and second thread clamping plates.

[0007] Furthermore, the axis of the wire connecting shaft coincides with the axis of the moving iron core.

[0008] Furthermore, the moving iron core includes an anti-rotation section and a fixed connection section fixedly connected to the thread guide shaft; the anti-rotation section passes through the anti-rotation hole of the mounting plate and includes two oppositely arranged anti-rotation side surfaces adapted to the anti-rotation hole; the anti-rotation section prevents rotation relative to the mounting plate during sewing through the cooperation of the two anti-rotation side surfaces and the anti-rotation hole; the fixed connection section passes through the anti-rotation hole and is located on the other side of the mounting plate, and is screwed into the threaded hole at one end of the thread guide shaft.

[0009] Furthermore, a through groove is provided on the end face of the other end of the wire guide shaft near the retaining ring. By operating the wire guide shaft at the through groove, the wire guide shaft can be fixed to or removed from the fixed connection section.

[0010] Furthermore, the retaining ring includes a C-shaped retaining ring body with the opening facing downward. The retaining ring body is sleeved on the wire guide shaft, and retaining ring clamping parts are integrally provided at the two free ends of the retaining ring body. The retaining ring is secured to the wire guide shaft by retaining ring screws screwed between the two retaining ring clamping parts.

[0011] Furthermore, the mounting plate has thread holes on both sides of the retaining ring for the sewing thread to pass through.

[0012] Furthermore, the mounting plate is provided with a plurality of electromagnets from top to bottom. Each electromagnet has a wire-passing shaft at one end of its moving iron core. Each wire-passing shaft is provided with a retaining ring, a first wire clamping plate, a second wire clamping plate, and a pressure-bearing cover in sequence. The mounting plate is provided with wire-passing holes on both sides of each retaining ring.

[0013] Furthermore, the electromagnet body is fixed to one side of the mounting plate by a first mounting screw.

[0014] Furthermore, the mounting plate is fixed to the housing of the sewing machine by a second mounting screw.

[0015] A sewing machine includes a housing and the aforementioned thread clamp assembly for sewing machines, wherein a mounting plate of the thread clamp assembly for sewing machines is fixed to the housing.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The sewing machine thread clamp assembly and sewing machine of this utility model include an electromagnet, which comprises an electromagnet body and a movable iron core that passes through the electromagnet body and can move axially relative to the electromagnet body. The electromagnet body is fixed to one side of a mounting plate, and one end of the movable iron core passes through the mounting plate and is located on the other side of the mounting plate, where a thread guide shaft is fixed. A first thread clamping plate, a second thread clamping plate, and a pressure cover that is in close contact with the mounting plate are sequentially sleeved on the thread guide shaft. A retaining ring that is in close contact with the first thread clamping plate and is used to limit the movement of the first thread clamping plate is also fixed on the thread guide shaft. The gap between the first thread clamping plate and the second thread clamping plate is... This device is used for threading sewing. By energizing the electromagnet, it attracts the moving iron core, which in turn drives the retaining ring through the thread guide shaft to apply pressure to the first clamping plate, clamping the sewing thread between the first and second clamping plates. By adjusting the current energizing the electromagnet, the pressure applied by the retaining ring to the first clamping plate is adjusted, thereby adjusting the clamping force applied to the sewing thread by the first and second clamping plates, and thus adjusting the tension force provided to the sewing thread. Therefore, it can achieve digital adjustment of the sewing thread tension with high precision.

[0018] In this utility model, the moving iron core includes an anti-rotation section and a fixed connection section that is fixedly connected to the wire guide shaft; the anti-rotation section passes through the anti-rotation hole of the mounting plate and includes two anti-rotation side surfaces that are arranged opposite to each other and adapted to the anti-rotation hole; the fixed connection section passes through the anti-rotation hole and is located on the other side of the mounting plate, and is screwed into the threaded hole at one end of the wire guide shaft; a through groove is provided on the end face of the other end of the wire guide shaft near the retaining ring. This anti-rotation section, through the cooperation of its two anti-rotation sides and anti-rotation holes, prevents rotation relative to the mounting plate during sewing. Furthermore, the cooperation between the fixed connecting section and the threaded hole at one end of the thread guide shaft, along with the through groove on the other end face of the thread guide shaft, allows for replacement or repair of the first and second thread clamping pieces without removing the retaining ring from the thread guide shaft. Simply operate the thread guide shaft at the through groove to detach it from the fixed connecting section, and then replace or repair the first and second thread clamping pieces fitted onto it. Therefore, when reinstalling the first and second thread clamping pieces, the fixed position of the retaining ring on the thread guide shaft remains unchanged, ensuring the stability of the clamping force applied to the thread. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the sewing machine thread clamp assembly of this utility model installed on the machine housing;

[0020] Figure 2 This is an exploded view of the thread clamp assembly for a sewing machine according to this utility model;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of an electromagnet;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the wire-connected shaft;

[0023] Figure 5 This is a three-dimensional structural diagram of the mounting plate.

[0024] Explanation of reference numerals in the figure: 1. Housing; 2. Second mounting screw; 3. Wire clamp assembly; 301. Electromagnet; 30101. Electromagnet body; 30102. Moving iron core; 301021. Anti-rotation section; 3010211. Anti-rotation side; 301022. Fixed connection section; 302. Wire guide shaft; 30201. Threaded hole; 30202. Through groove; 30301. First wire clamping piece; 30302. Second wire clamping piece; 304. Pressure cover; 305. Retaining ring; 30501. Retaining ring body; 30502. Retaining ring clamping part; 306. Retaining ring screw; 307. Mounting plate; 30701. Anti-rotation hole; 30702. Wire guide hole; 308. First mounting screw. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0026] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] like Figure 1 and Figure 2 As shown, a sewing machine thread clamp assembly 3 includes an electromagnet 301. The electromagnet 301 includes an electromagnet body 30101 and a movable iron core 30102 that passes through the electromagnet body 30101 and can move axially relative to the electromagnet body 30101. The electromagnet body 30101 is fixed to one side of a mounting plate 307. One end of the movable iron core 30102 passes through the mounting plate 307 and is located on the other side of the mounting plate 307, where a thread guide shaft 302 is fixed. A first thread clamping piece 30301, a second thread clamping piece 30302, and a pressure cover 304 that is tightly attached to the mounting plate 307 are sequentially sleeved on the thread guide shaft 302. The first thread clamping piece... The first clamping plate 30301, the second clamping plate 30302, and the pressure cover 304 can slide freely on the wire guide shaft 302. A retaining ring 305 is also fixed on the wire guide shaft 302, which is close to the first clamping plate 30301 and is used to limit the first clamping plate 30301. The gap between the first clamping plate 30301 and the second clamping plate 30302 is used to pass the sewing thread. By energizing the electromagnet body 30101, the moving iron core 30102 drives the retaining ring 305 through the wire guide shaft 302 to apply pressure to the first clamping plate 30301 and clamp the sewing thread between the first clamping plate 30301 and the second clamping plate 30302.

[0030] By energizing the electromagnet body 30101, the electromagnet body 30101 generates an attractive force on the moving iron core 30102. The moving iron core 30102, through the wire guide shaft 302, drives the retaining ring 305 to apply pressure to the first wire clamping plate 30301. The first wire clamping plate 30301 then applies pressure to the second wire clamping plate 30302, which in turn applies pressure to the pressure-bearing cover 304. The pressure-bearing cover 304 is tightly attached to the mounting plate 307, thus preventing the seam from being closed. The thread is held between the first clamping plate 30301 and the second clamping plate 30302. By adjusting the current energizing the electromagnet body 30101, the pressure applied by the retaining ring 305 to the first clamping plate 30301 can be adjusted, thereby adjusting the clamping force applied to the thread by the first clamping plate 30301 and the second clamping plate 30302. This allows for adjustment of the tension force provided to the thread, thus enabling digital adjustment of the thread tension with high precision.

[0031] Among them, the surface of the thread guide shaft 302 is polished to reduce the resistance to the stitching.

[0032] In one embodiment, the axis of the wire connecting shaft 302 coincides with the axis of the moving iron core 30102.

[0033] In one embodiment, such as Figure 3As shown, the moving iron core 30102 includes an anti-rotation section 301021 and a fixed connecting section 301022 fixedly connected to the wire guide shaft 302. The anti-rotation section 301021 passes through the anti-rotation hole 30701 of the mounting plate 307 and includes two opposing anti-rotation side surfaces 3010211 that are adapted to the anti-rotation hole 30701. The anti-rotation section 301021 prevents rotation relative to the mounting plate 307 during sewing through the cooperation of the two anti-rotation side surfaces 3010211 and the anti-rotation hole 30701. The fixed connecting section 301022 passes through the anti-rotation hole 30701 and is located on the other side of the mounting plate 307, and is screwed into the threaded hole 30201 at one end of the wire guide shaft 302. Figure 4 Preferably, a through groove 30202 is provided on the end face of the other end of the wire guide shaft 302 near the retaining ring 305, see... Figure 2 and Figure 4 By operating the wire connector 302 at the through slot 30202, the wire connector 302 can be fixed to or removed from the fixed connection section 301022.

[0034] Thus, the anti-rotation section 301021, through the cooperation of its two anti-rotation sides 3010211 and the anti-rotation hole 30701, can prevent rotation relative to the mounting plate 307 during sewing. Furthermore, through the cooperation of the fixed connecting section 301022 and the threaded hole 30201 at one end of the thread guide shaft 302, and the through groove 30202 on the other end face of the thread guide shaft 302, when it is necessary to replace or disassemble / repair the first thread clamping piece 30301 and the second thread clamping piece 30302, it is not necessary to remove the retaining ring 305 from the thread guide shaft 302; only the through groove 30202 needs to be operated. The thread guide shaft 302 is used to remove the thread guide shaft 302 from the fixed connecting section 301022, and to replace or disassemble and repair the first thread clamping piece 30301 and the second thread clamping piece 30302 sleeved on the thread guide shaft 302. Therefore, when reinstalling the first thread clamping piece 30301 and the second thread clamping piece 30302, the fixed position of the retaining ring 305 on the thread guide shaft 302 will not change, thereby ensuring the stability of the clamping force applied to the sewing thread. Moreover, the disassembly and assembly of the first thread clamping piece 30301, the second thread clamping piece 30302 and the thread guide shaft 302 are simple and efficient.

[0035] In one embodiment, such as Figure 2 As shown, the retaining ring 305 includes a C-shaped retaining ring body 30501 with the opening facing downward. The retaining ring body 30501 is sleeved on the wire guide shaft 302, and retaining ring clamping parts 30502 are integrally provided at the two free ends of the retaining ring body 30501. The retaining ring 305 is secured to the wire guide shaft 302 by retaining ring screws 306 screwed between the two retaining ring clamping parts 30502.

[0036] By setting the retaining ring screw 306, the fixed position of the retaining ring 305 on the wire guide shaft 302 can be adjusted before leaving the factory.

[0037] In one embodiment, such as Figure 2 and Figure 5 As shown, the mounting plate 307 has thread holes 30702 on both sides of the retaining ring 305 for the sewing thread to pass through.

[0038] In this way, the thread first passes through one of the thread holes 30702, then through the gap between the first thread clamping piece 30301 and the second thread clamping piece 30302, and then through the other thread hole 30702.

[0039] In one embodiment, such as Figure 1 and Figure 2 As shown, multiple electromagnets 301 are arranged sequentially from top to bottom on the mounting plate 307. Each electromagnet 301 has a wire-passing shaft 302 at one end of its moving iron core 30102. Each wire-passing shaft 302 is provided with a retaining ring 305, a first wire clamping piece 30301, a second wire clamping piece 30302, and a pressure cover 304 in sequence. Wire-passing holes 30702 are provided on both sides of each retaining ring 305 on the mounting plate 307.

[0040] In one embodiment, such as Figure 1 and Figure 2 As shown, the electromagnet body 30101 is fixed to one side of the mounting plate 307 by the first mounting screw 308.

[0041] In one embodiment, such as Figure 1 As shown, the mounting plate 307 is fixed to the housing 1 of the sewing machine by the second mounting screw 2.

[0042] A sewing machine includes a housing 1 and the aforementioned thread clamp assembly 3 for sewing machines. A mounting plate 307 of the thread clamp assembly 3 is fixed to the housing 1. Figure 1 .

[0043] In summary, the sewing machine thread tensioner assembly 3 of this utility model converts the attraction force of the electromagnet body 30101 on the moving iron core 30102 into a clamping force applied to the sewing thread. By controlling the magnitude of the current energizing the electromagnet body 30101, different attraction forces are generated by the electromagnet body 30101 on the moving iron core 30102, thereby changing the clamping force applied to the sewing thread by the first thread clamping plate 30301 and the second thread clamping plate 30302, and realizing digital adjustment of the sewing thread tension.

[0044] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A thread taker-in assembly for a sewing machine, characterized by: The system includes an electromagnet (301), which comprises an electromagnet body (30101) and a moving iron core (30102). The electromagnet body (30101) is fixed to one side of a mounting plate (307). One end of the moving iron core (30102) passes through the mounting plate (307) and is located on the other side of the mounting plate (307), where a wire guide shaft (302) is fixed. Various wire guide shafts (302) are sequentially fitted onto the wire guide shaft (302). It has a first clamping piece (30301), a second clamping piece (30302), and a pressure cover (304) that is close to the mounting plate (307). The thread guide shaft (302) is also fixed with a retaining ring (305) that is close to the first clamping piece (30301) and is used to limit the first clamping piece (30301). The gap between the first clamping piece (30301) and the second clamping piece (30302) is used to pass through the sewing thread.

2. A thread taker-in assembly for a sewing machine according to claim 1, characterized in that: The axis of the wire connecting shaft (302) coincides with the axis of the moving iron core (30102).

3. The thread taker-in assembly for a sewing machine according to claim 1, characterized in that: The moving iron core (30102) includes an anti-rotation section (301021) and a fixed connecting section (301022) fixedly connected to the wire guide shaft (302). The anti-rotation section (301021) passes through the anti-rotation hole (30701) of the mounting plate (307) and includes two anti-rotation side surfaces (3010211) arranged opposite to each other and adapted to the anti-rotation hole (30701). The anti-rotation section (301021) prevents rotation relative to the mounting plate (307) during sewing through the cooperation of the two anti-rotation side surfaces (3010211) and the anti-rotation hole (30701). The fixed connecting section (301022) passes through the anti-rotation hole (30701) and is located on the other side of the mounting plate (307), and is screwed into the threaded hole (30201) at one end of the wire guide shaft (302).

4. The thread taker-in assembly for a sewing machine according to claim 3, characterized in that: A through groove (30202) is provided on the end face of the other end of the wire guide shaft (302) near the retaining ring (305). By operating the wire guide shaft (302) at the through groove (30202), the wire guide shaft (302) can be fixed on or removed from the fixed connection section (301022).

5. The thread taker-in assembly for a sewing machine according to claim 1, wherein: The retaining ring (305) includes a C-shaped retaining ring body (30501) with the opening facing downward. The retaining ring body (30501) is sleeved on the wire guide shaft (302), and retaining ring clamping parts (30502) are integrally provided at the two free ends of the retaining ring body (30501). The retaining ring (305) is secured to the wire guide shaft (302) by retaining ring screws (306) screwed between the two retaining ring clamping parts (30502).

6. The thread taker-in assembly for a sewing machine according to claim 1, characterized in that: The mounting plate (307) has thread holes (30702) on both sides of the retaining ring (305) for the sewing thread to pass through.

7. The thread taker-in assembly for a sewing machine according to claim 1, wherein: The mounting plate (307) is provided with a plurality of electromagnets (301) arranged from top to bottom. Each electromagnet (301) has a wire-passing shaft (302) at one end of its moving iron core (30102). Each wire-passing shaft (302) is provided with a retaining ring (305), a first wire clamping piece (30301), a second wire clamping piece (30302), and a pressure cover (304) arranged in sequence. The mounting plate (307) is provided with wire-passing holes (30702) on both sides of each retaining ring (305).

8. The thread taker-in assembly for a sewing machine according to claim 1, characterized in that: The electromagnet body (30101) is fixed to one side of the mounting plate (307) by the first mounting screw (308).

9. The thread taker-in assembly for a sewing machine according to claim 1, wherein: The mounting plate (307) is fixed to the housing (1) of the sewing machine by a second mounting screw (2).

10. A sewing machine characterized by: Includes a housing (1) and a sewing machine thread clamp assembly (3) as described in any one of claims 1-9, wherein the mounting plate (307) of the sewing machine thread clamp assembly (3) is fixed to the housing (1).

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