CN116926793A - Elastic loose thread type electronic thread clamp and sewing machine - Google Patents

Abstract

The invention relates to an elastic loose-thread type electronic thread clamp and a sewing machine, comprising a thread clamp seat, a coil, a thread clamp sheet and a loose-thread elastic structure; the wire clamping seat comprises an iron core and a shell which is covered outside the iron core, an accommodating cavity is formed between the iron core and the shell, the coil is sleeved on the iron core and is positioned in the accommodating cavity, a wire clamping surface is arranged at the end part of the iron core, the wire clamping piece is abutted to the wire clamping surface, the wire clamping seat and the wire clamping piece are made of ferromagnetic materials, and the wire clamping piece is tightly sucked on the wire clamping surface of the wire clamping seat when the coil is electrified; the loose thread elastic structure provides an elastic force directly or indirectly acting on the thread clamping piece, and the elastic force can drive the thread clamping piece to separate from the thread clamping surface. The upper thread clamping device has the advantages that the upper thread clamping can be realized by controlling the average input current, the tension is adjusted, the upper thread tension control precision is high, the response is rapid, the current is very low, the elastic force is utilized to realize the thread loosening function, the structure is simple, and the cost is low.

Description

Elastic loose thread type electronic thread clamp and sewing machine

Technical Field

The invention relates to the field of sewing equipment, in particular to an elastic thread-loosening type electronic thread clamp and a sewing machine.

Background

When the sewing machine is used for sewing fabric, the rotating shuttle and the needle are mutually matched to interweave and interlock the bottom thread and the surface thread, in order to form good stitch in the sewing process, the tension of the surface thread and the bottom thread is required to be suitable, and the surface thread tension adjusting mechanism of the traditional sewing machine is used for adjusting the surface thread tension by manually rotating the knob compression tower spring. The knob is turned again to change the compression amount of the tower spring to adjust the tension of the upper thread according to fabrics with different thicknesses, so that the repeated labor amount is large, and the production efficiency is low; and because of the large manual adjustment error, the change of the tension of the upper thread is inaccurate, resulting in poor stitch of the upper thread.

In order to realize automatic adjustment of the tension of the upper thread of a sewing machine, an electronic thread clamp for clamping the upper thread by compressing a tower spring through a push-pull electromagnet or a stepping motor matched with a series of mechanical structures exists in the market at present, and the tension of the upper thread is adjusted, however, the existing methods have low response speed and cannot realize real-time adjustment; the electromagnet has serious heating, greatly influences the adjustment precision, and has the defects of complex structure and higher cost.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention is to provide an elastic thread-loosening type electronic thread clamp and a sewing machine, which can clamp an upper thread by controlling an average input current and adjust a tension, and has high control accuracy of the upper thread tension, rapid response, and very low current, so that no obvious temperature rise occurs, and simultaneously, a thread loosening function is realized by using elastic force, and the structure is simple.

In order to achieve the above-mentioned objective, the present invention provides an elastic loose wire type electronic wire clip, which comprises a wire clip seat, a coil, a wire clip sheet, and a loose wire elastic structure; the wire clamping seat comprises an iron core and a shell which is covered outside the iron core, an accommodating cavity is formed between the iron core and the shell, the coil is sleeved on the iron core and is positioned in the accommodating cavity, a wire clamping surface is arranged at the end part of the iron core, the wire clamping piece is abutted to the wire clamping surface, the wire clamping seat and the wire clamping piece are made of ferromagnetic materials, and the wire clamping piece is tightly sucked on the wire clamping surface of the wire clamping seat when the coil is electrified; the loose thread elastic structure provides an elastic force directly or indirectly acting on the thread clamping piece, and the elastic force can drive the thread clamping piece to separate from the thread clamping surface.

Further, the wire clamping device further comprises a guide structure arranged between the wire clamping seat and the wire clamping piece, wherein the guide structure is used for guiding the wire clamping piece to be close to or separate from the wire clamping surface in a linear movement mode, and the linear movement direction is perpendicular to the wire clamping surface.

Further, the guide structure comprises a guide pin fixedly connected to the wire clamping seat, and the wire clamping piece is sleeved on the guide pin through the through hole and can slide along the guide pin.

Further, the wire clamping piece and the wire clamping seat are always kept in contact.

Further, the iron core wire clamping device also comprises a wire blocking rod, wherein one end of the wire blocking rod is fixedly connected into the wire clamping surface of the iron core, and the other end of the wire blocking rod penetrates through the wire clamping piece.

Further, the wire blocking rod is in threaded connection with the wire clamping surface, an optical axis section is arranged on the wire blocking rod, and the wire clamping piece is sleeved on the optical axis section of the wire blocking rod through the through hole and can slide along the optical axis section.

Further, the loose thread elastic structure comprises a loose thread spring and a stress blocking piece fixed with the thread clamping piece, wherein one end of the loose thread spring is abutted against the thread blocking rod, and the other end of the loose thread spring is abutted against the stress blocking piece.

Further, the wire clamping piece is provided with a tubular structure at one side far away from the wire clamping seat, the end part of the wire blocking rod extends into the tubular structure, and the wire loosening spring is positioned in the tubular structure.

Further, the thread take-up device also comprises a thread take-up spring, wherein the thread take-up spring is sleeved on the peripheral surface of the tubular structure, and the limiting end of the thread take-up spring is clamped in the tubular structure.

As described above, the elastic loose wire type electronic wire clamp provided by the invention has the following beneficial effects:

through setting up clamp line seat, coil, clamp line piece and pine line elastic structure, during the use, the upper thread passes between clamp line piece and the clamp line face, and when needs produced upper thread tension, the coil circular telegram, clamp line seat and clamp line piece are magnetized, produce magnetism suction between clamp line piece and the clamp line seat, clamp line piece is inhaled tightly on the clamp line face to press from both sides the upper thread, the tension of the upper thread of being pressed from both sides between line piece and the clamp line face by the clamp is direct in direct proportion with clamp force. And because the coil is arranged in the accommodating cavity formed between the iron core and the shell, the accommodating cavity forms a relatively closed space, and when the coil is electrified, the generated magnetic field forms a complete closed loop through the integrated shell, the iron core and the wire clamping sheet pressed on the integrated shell, so that larger attraction and force are generated between the wire pressing sheet and the iron core/shell. When the loose wire is needed, the current in the coil is reduced to zero, and the elastic force provided by the loose wire elastic knot immediately drives the wire clamping piece to move to the wire clamping surface for separation, so that the loose wire function is realized. The elastic loose-wire type electronic thread clamp is simple in structure and high in response speed, and can realize that the tension adjusting speed is far shorter than the sewing period of each needle, so that new possibility is provided for the sewing control technology of a sewing machine, larger clamping angle force can be generated when less current is generated, the actual working current is very low, and obvious temperature rise cannot occur; the loose thread function is realized through the elasticity of the loose thread, no requirement is made on the duration time of the loose thread, and the structure is simple and the cost is lower.

Drawings

Fig. 1 is a cross-sectional view of an elastic thread-releasing electronic thread clamp of the present invention in a certain position.

Fig. 2 is a cross-sectional view of the elastic thread-releasing electronic thread clamp of the present invention in another position.

FIG. 3 is a schematic view showing the installation of the elastic thread-releasing type electronic thread clamp of the present invention on a sewing machine.

Description of element reference numerals

1. Wire clamping seat

1a iron core

1b shell

1c accommodating cavity

1d wire clamping surface

2. Coil

3. Wire clamping sheet

3a tubular structure

4. Thread picking spring

5. Wire blocking rod

6. Loose wire spring

7. Outer cover

7a force-bearing stop block

8. Fastening screw

9. Guide pin

10. Small wire clamp assembly

11. Casing of machine

12. Fixed slow line hook

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper", "lower", "left", "right", "middle", etc. are used herein for convenience of description, but are not to be construed as limiting the scope of the invention, and the relative changes or modifications are not to be construed as essential to the scope of the invention.

Referring to fig. 1 to 3, the invention provides an elastic loose wire type electronic wire clamp, which comprises a wire clamping seat 1, a coil 2, a wire clamping sheet 3 and a loose wire elastic structure; the wire clamping seat 1 comprises an iron core 1a and a shell 1b which is covered outside the iron core 1a, an accommodating cavity 1c is formed between the iron core 1a and the shell 1b, a coil 2 is sleeved on the iron core 1a and is positioned in the accommodating cavity 1c, a conducting wire of the coil 2 extends out of the end part of the accommodating cavity 1c, a wire clamping surface 1d is arranged at the end part of the iron core 1a, a wire clamping sheet 3 is abutted against the wire clamping surface 1d, the wire clamping seat 1 and the wire clamping sheet 3 are both made of ferromagnetic materials, and the wire clamping sheet 3 is tightly sucked on the wire clamping surface 1d of the wire clamping seat 1 when the coil 2 is electrified; the thread-loosening elastic structure provides an elastic force directly or indirectly acting on the thread-clamping piece 3, and the elastic force can drive the thread-clamping piece 3 to separate from the thread-clamping face 1 d. The wire clamping seat 1 and the wire clamping sheet 3 can be made of ferromagnetic materials such as soft iron and the like, and have the characteristics of high magnetization and demagnetization speeds. The elastic thread releasing type electronic thread clamp generally further comprises a thread picking spring 4 for helping thread take-up to make the upper thread and the lower thread uniform.

The basic working principle of the elastic loose wire type electronic wire clamp is as follows: when in use, the elastic loose-wire type electronic thread clamp is arranged at the position of the normal thread clamp of the shell 11, an upper thread of the sewing machine passes through the space between the thread clamping piece 3 and the thread clamping surface 1d, and after the upper thread passes through the thread clamping piece, the upper thread passes through the thread picking hook part for bearing the upper thread by the thread picking spring 4. When the upper thread tension is required to be generated, the coil 2 is electrified, the thread clamping seat 1 and the thread clamping piece 3 are magnetized, magnetic attraction is generated between the thread clamping piece 3 and the thread clamping seat 1, the thread clamping piece 3 is tightly attracted on the thread clamping surface 1d, the upper thread is clamped, the tension of the clamped upper thread in the sewing process is directly proportional to the clamping force between the thread clamping piece 3 and the thread clamping surface 1d, and tests prove that the tension in the sewing thread is directly proportional to the current in the coil 2 in a common range, and when the thread clamping piece 3 is tightly attracted on the thread clamping surface 1d, the elastic structure of the loose thread is in an elastic energy storage state. When the line tension needs to be controlled, only the current in the coil 2 needs to be adjusted, wherein the control of the current can be achieved through an adjustable constant current source circuit or through a pulse width modulation mode. In addition, since the coil 2 is located in the accommodating cavity 1c formed between the iron core 1a and the outer shell 1b, the accommodating cavity 1c forms a relatively closed space, and when the coil 2 is electrified, the generated magnetic field forms a complete closed loop through the integrated outer shell 1b and the iron core 1a and the wire clamping sheet 3 pressed on the integrated outer shell, so that a relatively large attraction force is generated between the wire clamping sheet and the iron core 1 a/outer shell 1 b. When one section of sewing is completed and thread loosening is needed, the current in the coil 2 is reduced to zero, the thread clamping seat 1 and the thread clamping piece 3 are demagnetized rapidly, the clamping force is lost between the thread clamping piece 3 and the thread clamping surface 1d, and then the elastic force provided by the thread loosening elastic knot immediately drives the thread clamping piece 3 to move to the thread clamping surface 1d for separation, so that the thread loosening effect is achieved. Due to the magnetization characteristics of ferromagnetic materials, modern current control techniques can ensure a response speed of the line tension adjustment of much less than milliseconds.

The elastic loose-wire type electronic thread clamp realizes the clamping and tension adjustment of the upper thread by controlling the current input by the coil 2, has simple structure and high response speed, and can realize that the tension adjustment speed is far shorter than the sewing period of each needle, thereby providing new possibility for the sewing control technology of a sewing machine, generating larger clamping angle force when the current is less, and having very low actual working current, so that obvious temperature rise can not occur; the loose thread function is realized through the elasticity of the loose thread, no requirement is made on the duration time of the loose thread, and the structure is simple and the cost is lower.

Referring to fig. 1 to 2, the elastic thread-releasing type electronic thread clamp according to the present invention is further described in the following embodiments:

in this embodiment, referring to fig. 1 and 2, as a preferred design, the elastic loose wire type electronic thread clamp further includes a guide structure provided between the thread clamping seat 1 and the thread clamping piece 3, the guide structure being for guiding the thread clamping piece 3 to be linearly moved close to or apart from the thread clamping face 1d, and a linear movement direction being perpendicular to the thread clamping face 1d, thereby making movement of the thread clamping piece 3 more stable. In this embodiment, specifically, the guiding structure includes a guiding pin 9 fixedly connected to the wire clamping seat 1, the guiding pin 9 is perpendicular to the wire clamping surface 1d and the wire clamping piece 3, the outer circumferential surface of the guiding pin 9 is a smooth surface, the wire clamping piece 3 is sleeved on the guiding pin 9 through a through hole slightly larger than the guiding pin 9, the guiding pin 9 and the wire clamping piece 3 are in clearance fit, and the wire clamping piece 3 can slide along the guiding pin 9. Of course, other arrangements of the guide structure are possible.

In this embodiment, referring to fig. 1 and 2, the guide pin 9 is made of ferromagnetic material such as soft iron, so that the wire clamping piece 3 and the wire clamping seat 1 can always keep indirect contact through the guide pin 9, so as to improve the attraction force of the magnetized wire clamping piece 3 and the magnetized wire clamping seat 1. Of course, the wire clamping piece 3 and the wire clamping seat 1 can also be contacted all the time in other ways.

In this embodiment, referring to fig. 1 and 2, as a preferred design, the elastic loose wire type electronic wire clamping device further includes a wire blocking rod 5, one end of the wire blocking rod 5 is fixedly connected into a wire clamping surface 1d of the iron core 1a, the other end of the wire blocking rod passes through the wire clamping piece 3, preferably, the wire blocking rod 5 adopts a half-tooth screw, which has a thread section and an optical axis section, the thread section thread of the end is screwed in the wire clamping surface 1d, the wire clamping piece 3 is sleeved on the optical axis section of the wire blocking rod 5 through a through hole, the thread clamping piece 3 is in clearance fit with the optical axis section, the wire clamping piece 3 slides along the optical axis section, the movement guiding of the wire clamping piece 3 can be further achieved, and meanwhile, the nut of the half-tooth screw can limit the position of the wire clamping piece 3 when the wire is loosened. The purpose of the thread stop lever 5 is to avoid the upper thread from falling out from between the thread clamping piece 3 and the thread clamping surface 1d, when in use, the upper thread passes through the space between the thread clamping piece 3 and the thread clamping surface 1d and bypasses the thread stop lever 5, and when taking up, the thread stop lever 5 can stop the upper thread, thereby preventing the upper thread from falling out from the space between the thread clamping piece 3 and the thread clamping surface 1 d. Furthermore, the wire blocking lever 5 and the guide pin 9 can cooperate to prevent circumferential rotation of the wire clamping piece 3.

In this embodiment, referring to fig. 1 and 2, as a preferred design, the elastic structure of the loose wire includes a loose wire spring 6, and a force-receiving stop 7a fixed to the wire clamping piece 3, where one end of the loose wire spring 6 abuts against the wire blocking rod 5, and the other end abuts against the force-receiving stop 7a. When the wire is clamped, the wire clamping sheet 3 drives the stress stop block 7a to be close to the wire clamping surface 1d, and at the moment, the wire loosening spring 6 is compressed, and the elastic force of the wire loosening spring can drive the wire clamping sheet 3 to be separated from the wire clamping surface 1 d. Preferably, when the thread clamping piece 3 is separated from the thread clamping surface 1d and abuts against the nut of the half-tooth screw, the thread loosening spring 6 has a certain compression amount, so that the thread loosening spring 6 has larger elastic force when the thread clamping piece 3 abuts against the thread clamping surface 1d, and the thread loosening response efficiency is improved. Further, the wire clamping piece 3 is provided with a tubular structure 3a at one side far away from the wire clamping seat 1, the end part of the wire blocking rod 5 stretches into the tubular structure 3a, the wire loosening spring 6 is positioned in the tubular structure 3a, the stress stop block 7a is also positioned in the tubular structure 3a, the radius of the inner cavity of the tubular structure 3a is slightly larger than that of the wire loosening spring 6, the telescopic action of the wire loosening spring 6 is limited, and deviation is avoided.

In this embodiment, referring to fig. 1 and 2, the elastic thread releasing type electronic thread clamp includes a thread take-up spring 4 for helping take-up to make the upper thread and the lower thread uniform, and as a preferred design, a limit groove is processed at the outer circumferential surface of the tubular structure 3a, and the thread take-up spring 4 is mounted at the outer circumferential surface of the tubular structure 3a, and its limit end is clamped at the limit groove to prevent the thread take-up spring 4 from rotating circumferentially.

In this embodiment, referring to fig. 1 and 2, as a preferred design, the elastic thread-loosening electronic thread clamp further comprises an outer casing 7, wherein the outer casing 7 is fixedly connected to the thread clamping piece 3 and covers the tubular structure 3a, and covers the thread take-up spring 4 and other structures. In this embodiment, the outer cover is fixedly connected to the tubular structure 3a by a fastening screw 8, which plays an axial limiting role on the thread take-up spring 4. A portion of the outer casing 7 extends into the tubular structure 3a to form a force-receiving stop 7a. Of course, in other embodiments, the outer casing 7 and the force-receiving stop 7a may be two separate parts, and the force-receiving stop 7a is fixedly connected to the outer casing 7.

The invention also provides a sewing machine, see fig. 3, comprising a small thread clamp assembly 10 and a fixed thread buffering hook 12, and further comprising the elastic thread releasing type electronic thread clamp, which is fixed at the position of the conventional thread clamp of the shell 11 through screws, wherein the thread clamp seat 1 faces the inner side of the shell 11, the outer cover shell 7 faces the outer side of the shell 11, and the on-off of the thread 2 in the elastic thread releasing type electronic thread clamp is controlled by a main control system of the sewing machine. After the upper thread of the sewing machine passes through the hole of the small thread clamp assembly 10, the upper thread enters the middle of the thread clamping sheet 3 and the thread clamping surface 1d of the elastic thread loosening type electronic thread clamp and bypasses the thread blocking rod 5, then bypasses the thread picking spring 4 and then passes through the fixed thread buffering hook 12. When the sewing machine is in a normal sewing state, according to the fabric and the sewing requirement, the main control system of the sewing machine adjusts the attraction force between the thread clamping surface 1d of the thread clamping seat 1 and the thread clamping piece 3 by adjusting the current of the coil 2 in the elastic thread loosening type electronic thread clamp, so that the automatic and controllable adjustment of the tension of the upper thread is realized, when the sewing machine needs to cut threads for loosening, the main control system of the sewing machine cuts off the power supply of the coil 2, and the thread loosening spring 6 drives the thread clamping piece 3 to be completely separated from the thread clamping surface 1d of the thread clamping seat 1, so that the thread loosening effect is realized.

In summary, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utility value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. An elastic loose wire type electronic wire clamp is characterized in that: comprises a thread clamping seat (1), a coil (2), a thread clamping sheet (3) and a thread loosening elastic structure; the wire clamping seat (1) comprises an iron core (1 a) and a shell (1 b) covering the outside of the iron core (1 a), a containing cavity (1 c) is formed between the iron core (1 a) and the shell (1 b), the coil (2) is sleeved on the iron core (1 a) and is positioned in the containing cavity (1 c), a wire clamping surface (1 d) is arranged at the end part of the iron core (1 a), the wire clamping piece (3) is abutted against the wire clamping surface (1 d), the wire clamping seat (1) and the wire clamping piece (3) are made of ferromagnetic materials, and the wire clamping piece (3) is tightly sucked on the wire clamping surface (1 d) of the wire clamping seat (1) when the coil (2) is electrified; the loose thread elastic structure provides an elastic force directly or indirectly acting on the thread clamping piece (3), and the elastic force can drive the thread clamping piece (3) to be separated from the thread clamping surface (1 d).

2. The elastic thread-releasing electronic thread clamp of claim 1, wherein: the wire clamping device is characterized by further comprising a guide structure arranged between the wire clamping seat (1) and the wire clamping piece (3), wherein the guide structure is used for guiding the wire clamping piece (3) to be close to or separated from the wire clamping surface (1 d) along the linear movement direction, and the linear movement direction is perpendicular to the wire clamping surface (1 d).

3. The elastic thread-releasing electronic thread clamp of claim 2, wherein: the guide structure comprises a guide pin (9) fixedly connected to the wire clamping seat (1), and the wire clamping piece (3) is sleeved on the guide pin (9) through a through hole and can slide along the guide pin (9).

4. The electronic wire holder of claim 1, wherein: the wire clamping piece (3) and the wire clamping seat (1) are always kept in contact.

5. The elastic thread-releasing electronic thread clamp of claim 1, wherein: the wire blocking device further comprises a wire blocking rod (5), one end of the wire blocking rod (5) is fixedly connected into a wire clamping surface (1 d) of the iron core (1 a), and the other end of the wire blocking rod penetrates through the wire clamping piece (3).

6. The elastic thread-releasing electronic thread clamp of claim 5, wherein: the wire blocking rod (5) is in threaded connection with the wire clamping surface (1 d), an optical axis section is arranged on the wire blocking rod (5), and the wire clamping piece (3) is sleeved on the optical axis section of the wire blocking rod (5) through a through hole and can slide along the optical axis section.

7. The elastic thread-releasing electronic thread clamp of claim 1, wherein: the elastic loose wire structure comprises a loose wire spring (6) and a stress blocking piece (7 a) fixed with the wire clamping piece (3), wherein one end of the loose wire spring (6) abuts against the wire blocking rod (5), and the other end abuts against the stress blocking piece (7 a).

8. The elastic thread-releasing electronic thread clamp of claim 7, wherein: the wire clamping piece (3) is provided with a tubular structure (3 a) at one side far away from the wire clamping seat (1), the end part of the wire blocking rod (5) stretches into the tubular structure (3 a), and the wire loosening spring (6) is positioned in the tubular structure (3 a).

9. The elastic thread-releasing electronic thread clamp of claim 8, wherein: the yarn picking device further comprises a yarn picking spring (4), wherein the yarn picking spring (4) is sleeved on the outer peripheral surface of the tubular structure (3 a), and the limiting end of the yarn picking spring is clamped in the tubular structure (3 a).

10. A sewing machine comprising a small thread clamp assembly (10) and a fixed slow thread hook (12), characterized in that: the elastic loose thread type electronic thread clamp is characterized in that the elastic loose thread type electronic thread clamp further comprises an elastic loose thread type electronic thread clamp according to any one of claims 1 to 9, after an upper thread of the sewing machine passes through the small thread clamp assembly (10), the upper thread enters a space between a thread clamping piece (3) and a thread clamping surface (1 d) of the elastic loose thread type electronic thread clamp and bypasses a thread blocking rod (5), and then passes through a fixed thread buffering hook (12).