Thread clamping device of sewing machine

Abstract

The utility model relates to the field of sewing machines, and discloses a thread clamping device of a sewing machine, which comprises a mounting box, the side wall of the mounting box is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a threaded rod, the outer wall of the threaded rod is in threaded connection with a movable frame, and the movable frame is in sliding connection with the inner wall of the mounting box. The two moving frames are symmetrically arranged at the two ends of the mounting box, and a clamping assembly is arranged on the mounting box; compared with a traditional thread clamping device, the device can flexibly adjust the tensioning force and the moving state of the sewing thread according to the specific characteristics of the sewing thread and different sewing process requirements, the problems of loosening, deformation or breakage and the like caused by improper tensioning of the sewing thread are solved, the quality and stability of sewing stitches are improved, and the production efficiency is improved. Therefore, the sewing machine has excellent performance in various sewing tasks, and is particularly suitable for complex sewing operation and production of high-quality sewing products.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine field, concretely is a sewing machine's thread clamping device. BACKGROUND

[0002] The thread clamping device of sewing machine is the key component for controlling the tension of sewing thread in the sewing machine. During the sewing process, a certain pressure is applied to the sewing thread by the thread clamping device, so that the sewing thread maintains appropriate tightness when the needle pierces the fabric and the bottom thread interweaves, thereby ensuring the uniformity, beauty and firmness of the stitch. The working principle is to adjust the tension of the sewing thread by adjusting the clamping force through components such as thread clamping sheet or thread clamp, so as to adapt to the needs of different fabrics, needle methods and sewing speeds.

[0003] Application No. 202223089674.2 discloses a sewing machine's thread clamping device, the utility model discloses a setting is convenient for the installation connection of fixed block through the setting of mounting plate, the setting is convenient for the installation and fixed of cross plate through the setting of fixed slot, the setting is convenient for the installation of nut and the opening of the round hole required for the installation of threaded rod through the setting of cross plate, the setting is convenient for the fixed and position limiting of fixed block through the setting of threaded rod, the setting can effectively buffer the tension received by the face line when the device is used, can effectively protect the face line, improve the safety and protection performance of the device when used.

[0004] The above-mentioned device is fixed in the clamping force of sewing thread when used, cannot adjust the clamping force according to the thickness and material of sewing thread, leads to the condition that sewing thread is prone to looseness or deformation damage, therefore we propose a sewing machine's thread clamping device. Utility model content

[0005] In view of the deficiencies of the prior art, the utility model provides a sewing machine's thread clamping device, which solves the problem that the clamping force of the above-mentioned device is fixed when used, cannot be adjusted according to the thickness and material of the sewing thread, and leads to the condition that the sewing thread is prone to looseness or deformation damage.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a sewing machine's thread clamping device, comprising a mounting box, the mounting box side wall is fixedly connected with first motor, the first motor output is fixedly connected with threaded rod, the threaded rod outer wall is threadedly connected with moving frame, the moving frame is slidably connected in the mounting box inner wall, the moving frame is provided with two groups and symmetrically arranged at the both ends of the mounting box, the mounting box is equipped with clamping assembly.

[0007] Preferably, the clamping assembly comprises movable plates, springs, tensioning wheels, fixed rods, the movable plates are movably hinged on the side walls of the moving frame, the fixed rods are fixedly connected to the inner walls of one set of movable plates, the tensioning wheels are rotatably sleeved on the outer walls of the fixed rods, and the springs are fixedly connected between the two sets of movable plates.

[0008] Preferably, the top of the set of movable plates is fixedly connected with a second motor, the output end of the second motor is fixedly connected with a rotating rod, the rotating rod is rotatably connected to the inner wall of the movable plate, and the set of tensioning wheels is fixedly sleeved on the outer wall of the rotating rod.

[0009] Preferably, the outer wall of the tensioning wheel is fixedly sleeved with a rubber layer.

[0010] Preferably, the side wall of the mounting box is fixedly connected with a first connecting plate, and the top of the first connecting plate is fixedly connected with a sleeve ring.

[0011] Preferably, the side wall of the mounting box is fixedly connected with two sets of second connecting plates, the inner wall of the end of the second connecting plate away from the mounting box is slidably connected with a cutting knife, the cutting knife is provided with a square groove, and the second connecting plate and the cutting knife are provided with bolts.

[0012] Preferably, the four corners of the mounting box are fixedly connected with fixed ear plates, and the fixed ear plates are provided with threaded holes.

[0013] Compared with the prior art, the sewing machine thread clamping device has the following beneficial effects:

[0014] 1、The thread clamping device of the sewing machine, when the tension wheel starts to move, it will tightly adhere to the outer wall of the sewing thread, as the moving frame moves further, the distance between the movable plates will change under the action of the spring, the spring is stretched or compressed, the elastic force will make the tension wheel expand or contract on the sewing thread, at the same time, the tension wheel will adhere more tightly to the outer wall of the sewing thread, in this process, the tension wheel starts to move the sewing thread, due to the rotation characteristics of the tension wheel, the sewing thread will move better on the tension wheel. Moreover, the rotation and position change of the tension wheel will continuously adjust the tension of the sewing thread according to the elastic force of the spring and the position of the moving frame. By accurately controlling the rotation amount and direction of the first motor, the moving distance of the moving frame can be accurately controlled, and then the tension degree of the tension wheel to the sewing thread can be accurately adjusted. This accurate adjustment can adjust the tension of the sewing thread to the appropriate state according to the thickness, material and different sewing process requirements of the sewing thread, ensure the uniformity and firmness of the sewing thread, and use the first motor to drive the threaded rod to move the moving frame and the tension wheel, combined with the elastic effect of the spring, to realize the accurate adjustment of the tension of the sewing thread. At the same time, the tension wheel drives the sewing thread to move, so that the sewing thread can move better on it, and the tension and movement performance of the sewing thread is optimized. Compared with the traditional thread clamping device, the device can flexibly adjust the tension and movement state of the sewing thread according to the specific characteristics of the sewing thread and different sewing process requirements, avoid the problems of loosening, deformation or rupture of the sewing thread due to improper tension, improve the quality and stability of the sewing thread, and make the sewing machine perform well in various sewing tasks, especially suitable for complex sewing operations and production of high-quality sewing products.

[0015] 2、The thread clamping device of the sewing machine, the sleeve ring on the first connecting plate provides convenience for the introduction of the sewing thread, avoids the entanglement and knotting of the sewing thread, and improves the smoothness of the sewing operation. At the same time, the cutting knife on the second connecting plate facilitates cutting of the excess sewing thread during sewing, without the need for additional cutting tools, simplifying the operation process and saving operation time, which can significantly improve the sewing efficiency and bring great convenience to the sewing operation. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a whole structure schematic view of the utility model;

[0017] Fig. 2 It is a side view structure schematic view of the utility model;

[0018] Fig. 3 It is an internal structure schematic view of the utility model.

[0019] In the figure: 1, installation box; 2, fixed lug; 3, first motor; 4, threaded rod; 5, moving frame; 6, movable plate; 7, spring; 8, tensioning wheel; 9, second motor; 91, rotating rod; 10, first connecting plate; 11, collar; 12, second connecting plate; 13, cutting knife; 14, square groove; 15, bolt; 16, fixed rod. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] Please refer to Figs. 1-3 A thread clamping device of a sewing machine, comprising an installation box 1, a first motor 3 is fixedly connected to the side wall of the installation box 1, a threaded rod 4 is fixedly connected to the output end of the first motor 3, a moving frame 5 is threadedly connected to the outer wall of the threaded rod 4, the moving frame 5 is slidingly connected to the inner wall of the installation box 1, the moving frame 5 is provided with two groups and symmetrically arranged at both ends of the installation box 1, and a clamping assembly is arranged on the installation box 1; when the tension of the sewing thread needs to be adjusted, the first motor 3 is started, and the first motor 3 drives the threaded rod 4 to rotate. Since the moving frame 5 is threadedly connected with the threaded rod 4 and slidingly connected to the inner wall of the installation box 1, the rotation of the threaded rod 4 will make the two groups of moving frames 5 symmetrically distributed at both ends of the installation box 1 move inside the installation box 1, and then the clamping assembly is used to clamp the sewing thread.

[0022] The clamping assembly comprises the movable plates 6, the springs 7, the tensioning wheels 8 and the fixed rods 16. The movable plates 6 are movably hinged on the side walls of the moving frame 5 and are provided with two groups. The fixed rods 16 are fixedly connected to the inner walls of one group of the movable plates 6. The tensioning wheels 8 are rotatably sleeved on the outer walls of the fixed rods 16. The springs 7 are fixedly connected between the two groups of the movable plates 6. The top of one group of the movable plates 6 is fixedly connected with the second motor 9. The output end of the second motor 9 is fixedly connected with the rotating rod 91. The rotating rod 91 is rotatably connected to the inner wall of the movable plate 6. One group of the tensioning wheels 8 is fixedly sleeved on the outer wall of the rotating rod 91. When the tensioning wheels 8 start to move, they will be tightly attached to the outer wall of the sewing thread. With the further movement of the moving frame 5, the distance between the movable plates 6 will change under the action of the springs 7. The springs 7 will be stretched or compressed. The elasticity of the springs 7 will make the tensioning wheels 8 expand or contract on the sewing thread to the two ends. At the same time, the tensioning wheels 8 will be more tightly attached to the outer wall of the sewing thread. In this process, the tensioning wheels 8 will start to move the sewing thread. Due to the rotating characteristics of the tensioning wheels 8, the sewing thread will move better on the tensioning wheels 8. Moreover, the rotation and position change of the tensioning wheels 8 will continuously adjust the tension of the sewing thread according to the elasticity of the springs 7 and the position of the moving frame 5. By accurately controlling the rotating amount and rotating direction of the first motor 3, the moving distance of the moving frame 5 can be accurately controlled, and then the tensioning degree of the tensioning wheels 8 to the sewing thread can be accurately adjusted. This accurate adjustment can adjust the tension of the sewing thread to a suitable state according to the thickness, material and different sewing process requirements of the sewing thread, so as to ensure the uniformity and firmness of the sewing thread trace.

[0023] The outer wall of the tensioning wheel 8 is fixedly sleeved with a rubber layer. The rubber layer can not only increase the friction between the sewing thread and the tensioning wheel 8 to prevent the sewing thread from sliding, but also protect the sewing thread from being damaged, thereby providing a good basis for subsequent tensioning operation of the sewing thread.

[0024] The side wall of the mounting box 1 is fixedly connected with the first connecting plate 10. The top of the first connecting plate 10 is fixedly connected with the sleeve ring 11. First, the sewing thread is threaded through the sleeve ring 11 on the first connecting plate 10 of the side wall of the mounting box 1. Then the sewing thread is guided to the tensioning wheel 8 on the two groups of movable plates 6, so that the sewing thread is in contact with the outer wall of the tensioning wheel 8.

[0025] The side wall of the mounting box 1 is fixedly connected with two groups of second connecting plates 12. The inner wall of the end of the second connecting plate 12 away from the mounting box 1 is slidably connected with the cutting knife 13. The cutting knife 13 is provided with a square groove 14. The second connecting plate 12 and the cutting knife 13 are provided with the bolt 15. During the sewing process, when it is found that the sewing thread is too long, the cutting knife 13 on the second connecting plate 12 can be used for cutting operation. First, the square groove 14 is pulled to make the cutting knife 13 slide on the inner wall of the second connecting plate 12. The position of the cutting knife 13 is adjusted to be aligned with the position of the sewing thread to be cut. Then, the cutting knife 13 is fixed at the position by tightening the bolt 15. Finally, the cutting knife 13 is used to cut the sewing thread to remove the part of the sewing thread that is too long.

[0026] The mounting box 1 is fixedly connected with a fixed lug plate 2 at the four corners, and the fixed lug plate 2 is provided with threaded holes; in use, the threaded holes on the fixed lug plate 2 are fixed with the corresponding parts of the sewing machine through connecting members such as bolts.

[0027] Structure description: mounting box 1: as the main body shell of the entire thread clamping device, it provides a mounting base and a containing space for other components. It is a hollow structure that concentrates the main components of the thread clamping device together, plays a protective and positioning role, and also provides a relatively stable working environment for the movement of internal components.

[0028] Support and mounting components

[0029] Fixed lug plate 2: installed at the four corners of the mounting box 1, through the threaded holes on it, the entire thread clamping device can be firmly installed on the sewing machine. It ensures the stability of the thread clamping device during the operation of the sewing machine, prevents the loosening or displacement of the thread clamping device due to the vibration of the sewing machine or other external factors, and guarantees the working stability and reliability of the thread clamping device.

[0030] First motor 3: as the main power source, its output end is fixedly connected with the threaded rod 4. When the first motor 3 starts, it will transmit rotary power to the threaded rod 4, thereby driving the movement of subsequent components and providing power for the adjustment of the tension of the sewing thread.

[0031] Threaded rod 4: connected with the output end of the first motor 3 and threadedly connected with the moving frame 5, and slidingly connected with the inner wall of the mounting box 1. When the first motor 3 drives the threaded rod 4 to rotate, due to the characteristics of the threaded connection, it will promote the moving frame 5 to move in a certain direction inside the mounting box 1, thereby realizing the basic movement for adjusting the tension of the sewing thread.

[0032] Moving frame 5: provided with two groups, symmetrically arranged at both ends of the mounting box 1, and connected with the threaded rod 4 through threaded connection and slidingly connected with the inner wall of the mounting box 1, realizing adjustable linear motion. When the first motor 3 drives the threaded rod 4 to rotate, the moving frame 5 will move correspondingly inside the mounting box 1, driving the connected components to adjust the position, thereby affecting the tension state of the sewing thread.

[0033] Movable plate 6: provided with two groups, hingedly connected to the side wall of the moving frame 5. Its position and movement are controlled by the moving frame 5, and the movable plate 6 can move within a certain range to provide flexible adjustment space for subsequent tensioning operations.

[0034] Spring 7: connected between the two groups of movable plates 6, its elasticity provides elasticity for the tension of the sewing thread. When the moving frame 5 drives the movable plate 6 to move, the spring 7 will be stretched or compressed according to the position change of the movable plate 6, generating corresponding elastic force, which will be transmitted to the tensioning wheel 8, exerting different tension on the sewing thread, so as to realize the elastic adjustment of the tension degree of the sewing thread.

[0035] Tensioning wheel 8: rotatingly sleeved on the outer wall of fixed rod 16, and fixedly connected with the inner wall of a group of movable plates 6. The tensioning wheel 8 is the component directly contacting with the sewing thread, when the movable plate 6 moves and the spring 7 stretches and contracts, the tensioning wheel 8 will change its position and pressure, and through the contact and friction with the sewing thread, it performs the tensioning operation on the sewing thread. The outer wall of the tensioning wheel 8 is usually specially designed, such as possibly sleeving a rubber layer, to increase the friction force with the sewing thread, prevent the sewing thread from sliding, and ensure the tensioning effect.

[0036] Second motor 9: as an auxiliary power source, it can be started when special tensioning adjustment is needed. Its output end is fixedly connected with the rotating rod 91, providing another adjusting power for the tensioning wheel 8.

[0037] Rotating rod 91: rotatingly connected with the inner wall of the movable plate 6, and a group of tensioning wheels 8 are fixedly sleeved on the outer wall thereof. When the second motor 9 drives the rotating rod 91 to rotate, it will make the group of tensioning wheels 8 rotate.

[0038] First connecting plate 10: installed on the side wall of the mounting box 1, its main function is to provide guidance and support for the introduction of the sewing thread.

[0039] Sleeve 11: located at the top of the first connecting plate 10, the sewing thread first passes through the sleeve 11 into the thread clamping device, which provides an orderly entry path for the sewing thread, reduces the possibility of sewing thread entanglement or knotting, and enables the sewing thread to smoothly enter the subsequent tensioning operation link.

[0040] Second connecting plate 12: installed on the side wall of the mounting box 1, mainly used for carrying components such as cutting knife 13, providing installation position and sliding track for the operation of the cutting knife 13.

[0041] Cutting knife 13: installed on the inner wall of the second connecting plate 12 away from the mounting box 1, by sliding on the second connecting plate 12, its position can be adjusted, when it is needed to cut the sewing thread, it can be aligned with the sewing thread, and then fixed in position through the bolt 15, and then the sewing thread can be cut, avoiding the influence of the too long sewing thread on the sewing operation and product quality.

[0042] Square groove 14: provided on the cutting knife 13, its specific function may be to facilitate operation or reduce weight, or to cooperate with other components to ensure the stability and accuracy of the cutting knife 13 during sliding and use.

[0043] Bolt 15: used to fix the cutting knife 13 in the corresponding position on the second connecting plate 12, ensure the position stability of the cutting knife 13 when cutting the sewing thread, prevent displacement during the cutting process, and ensure the accuracy of the cutting operation.

[0044] Fixed rod 16: fixedly connected to the inner wall of a group of movable plates 6, provides rotating support for the tensioning wheel 8, enables the tensioning wheel 8 to be stably sleeved on the outer wall, and changes position and tensioning force on the sewing thread along with the movement of the movable plate 6 and the elastic force change of the spring 7.

[0045] Working principle

[0046] First, the sewing thread is threaded through the sleeve ring 11 on the first connecting plate 10 of the installation box 1 side wall, and then guided to the tensioning wheel 8 on the two groups of movable plates 6, so that the sewing thread is in contact with the outer wall of the tensioning wheel 8. The outer wall of the tensioning wheel 8 is covered with a rubber layer, which not only increases the friction between the sewing thread and the tensioning wheel 8 to prevent the sewing thread from slipping, but also protects the sewing thread from damage, providing a good foundation for subsequent tensioning of the sewing thread. When it is necessary to adjust the tensioning degree of the sewing thread, the first motor 3 is started, and the first motor 3 drives the threaded rod 4 to rotate. Since the moving frame 5 is threadedly connected with the threaded rod 4 and slidably connected to the inner wall of the installation box 1, the rotation of the threaded rod 4 will cause the two groups of moving frames 5 symmetrically distributed on both ends of the installation box 1 to move inside the installation box 1. One of the moving frames 5 will drive the tensioning wheels 8 on the two groups of movable plates 6 connected thereto to move. When the tensioning wheel 8 starts to move, it will tightly adhere to the outer wall of the sewing thread. With the further movement of the moving frame 5, the distance between the movable plates 6 will change under the action of the spring 7, and the spring 7 will be stretched or compressed. The elastic force of the spring 7 will cause the tensioning wheel 8 to expand or contract on both ends of the sewing thread, and at the same time, the tensioning wheel 8 will be more tightly adhered to the outer wall of the sewing thread. In this process, the tensioning wheel 8 starts to move the sewing thread. Due to the rotating characteristics of the tensioning wheel 8, the sewing thread will move better on the tensioning wheel 8. Moreover, the rotation and position change of the tensioning wheel 8 will continuously adjust the tensioning force of the sewing thread according to the elastic force of the spring 7 and the position adjustment of the moving frame 5. By accurately controlling the rotation amount and direction of the first motor 3, the moving distance of the moving frame 5 can be accurately controlled, and in turn, the tensioning degree of the tensioning wheel 8 on the sewing thread can be accurately adjusted. This accurate adjustment can adjust the tensioning force of the sewing thread to a suitable state according to the thickness, material of the sewing thread and different sewing process requirements, to ensure the uniformity and firmness of the sewing thread trace.

[0047] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A thread clamping device of a sewing machine, comprising a mounting box (1), a first motor (3) is fixedly connected to the side wall of the mounting box (1), and a threaded rod (4) is fixedly connected to the output end of the first motor (3), characterized in that, Also include: The outer wall of the threaded rod (4) is connected with the moving frame (5), the moving frame (5) is connected with the inner wall of the installation box (1), the moving frame (5) is provided with two groups and is symmetrically arranged at both ends of the installation box (1), and the installation box (1) is provided with a clamping assembly.

2. A thread clamping device for a sewing machine according to claim 1, characterized in that: The clamping assembly comprises a movable plate (6), a spring (7), a tensioning wheel (8) and a fixed rod (16), the movable plate (6) is provided with two groups and is movably connected to the side wall of the moving frame (5), the fixed rod (16) is fixedly connected to the inner wall of one group of movable plates (6), the tensioning wheel (8) is rotatably connected to the outer wall of the fixed rod (16), and the spring (7) is fixedly connected between the two groups of movable plates (6).

3. A thread clamping device for a sewing machine according to claim 2, characterized in that: The top of the movable plate (6) is fixedly connected with the second motor (9), the output end of the second motor (9) is fixedly connected with the rotating rod (91), the rotating rod (91) is rotatably connected to the inner wall of the movable plate (6), and the one group of tensioning wheels (8) is fixedly connected to the outer wall of the rotating rod (91).

4. A thread clamping device for a sewing machine according to claim 3, wherein: The outer wall of the tensioning wheel (8) is fixedly connected with a rubber layer.

5. The thread clamping device of a sewing machine according to claim 1, wherein: The side wall of the installation box (1) is fixedly connected with the first connecting plate (10), and the top of the first connecting plate (10) is fixedly connected with the sleeve ring (11).

6. The thread clamping device of a sewing machine according to claim 1, wherein: The side wall of the installation box (1) is fixedly connected with two groups of second connecting plates (12), the inner wall of the end of the second connecting plate (12) away from the installation box (1) is slidably connected with the cutting knife (13), the cutting knife (13) is provided with a square groove (14), and the second connecting plate (12) and the cutting knife (13) are provided with a bolt (15).

7. The thread clamping device of a sewing machine according to claim 1, wherein: The four corners of the installation box (1) are fixedly connected with the fixed ear plate (2), and the fixed ear plate (2) is provided with a threaded hole.

Images