Thread loosening device for sewing machine

Abstract

The utility model relates to the field of sewing machinery, and discloses a thread loosening device for a sewing machine, including a spring top seat and a bottom plate, a hollow shaft is fixedly connected to the middle of the left side of the spring top seat, a reset spring is fixedly connected to the outer periphery of the left side of the spring top seat, a spring bottom seat is fixedly connected to the left end of the reset spring, the left end of the hollow shaft passes through and is fixedly connected to a connecting seat, a push rod passes through and is slidably connected to the middle of the left side of the connecting seat, a connecting plate is provided at the left end of the push rod, and a sliding block is fixedly connected to the left side of the connecting plate. In the utility model, through the mutual cooperation of the movable sleeve, the first bevel gear, the second bevel gear, the fourth bevel gear and the hand wheel, when the micro servo motor fails or the power is off, the movable sleeve can be moved to make the fourth bevel gear contact and mesh with the first bevel gear, so that the thread clamp can be manually loosened.

Description

Technical Field

[0001] The utility model relates to the field of sewing machines, in particular to a thread loosening device for sewing machines. Background Art

[0002] With the development of science and technology and the progress of the times, sewing machines are also moving rapidly towards mechanization and automation. However, to gain customer recognition, it is not enough to just be mechanized and automated. Durability and good results are the main factors for gaining customer recognition.

[0003] Automated sewing machines generally use a thread loosening device. Most of the existing thread loosening devices are driven by a thread trimming electromagnet, which then drives the thread loosening top plate to swing through the connection of the thread loosening wire. The thread loosening top plate drives the thread loosening push rod to move to the right. The thread loosening push rod pushes the thimble, and the thimble pushes the thread loosening plate to move outward, so that the thread clamping device plate loses the spring pressure and loosens, thereby loosening the thread. However, since the thread loosening wire is too long, the resistance in the middle of the device will be very large. The thread trimming electromagnet must be driven with a lot of force, and the steel wire repeatedly pulls the thread loosening top plate, which is easy to cause the joint to break, making the machine unusable.

[0004] Therefore, for the existing thread loosening device of the sewing machine, the steel wire repeatedly pulls the thread loosening top plate, which easily causes the joint to break, making the machine unusable. A thread loosening device for a sewing machine that solves the above problem is needed. Utility Model Content

[0005] In order to solve the problem in the prior art that the steel wire repeatedly loosens the top plate, which easily causes the joint to break and makes the machine unusable, the present application provides a thread loosening device for a sewing machine.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A thread loosening device for a sewing machine comprises a spring top seat and a bottom plate, wherein a hollow shaft is fixedly connected to the middle of the left side of the spring top seat, a reset spring is fixedly connected to the outer periphery of the left side of the spring top seat, the left end of the reset spring is fixedly connected to the spring lower seat, the left end of the hollow shaft passes through and is fixedly connected to a connecting seat, a push rod passes through and is slidably connected to the middle of the left side of the connecting seat, a connecting plate is provided at the left end of the push rod, a sliding block is fixedly connected to the left side of the connecting plate, a rocker plate passes through and is slidably connected to the left side of the sliding block, a mounting sleeve is passed through and provided on the left side of the connecting seat, and the mounting sleeve A mounting seat is fixedly connected to the left side, and the mounting seat is rotatably connected to the middle of the front and rear sides of the seesaw, a moving rod is penetrated and rotatably connected to the bottom of the seesaw, a micro servo motor is fixedly connected to the left side of the top of the base plate, and a third bevel gear is fixedly connected to the output end of the micro servo motor, a slide rail is fixedly connected to the right side of the top of the base plate, a screw rod is penetrated and rotatably connected to the left side of the slide rail, a nut pair is penetrated and threadedly connected to the outside of the screw rod, and the nut pair is penetrated and slidably connected to the slide rail, the left end of the screw rod is fixedly connected to the first bevel gear, and an adjustment component is provided in the middle of the top of the base plate.

[0008] As a further improvement of the utility model, the adjustment assembly includes a movable sleeve, which passes through and is slidably connected to the middle of the top of the base plate, the front side of the inner wall of the movable sleeve passes through and is rotatably connected to a second bevel gear, the rear side of the inner wall of the movable sleeve passes through and is rotatably connected to a fourth bevel gear, the rear end of the fourth bevel gear is fixedly connected to a hand wheel, and the hand wheel and the movable sleeve pass through and are rotatably connected.

[0009] As a further improvement of the utility model, a plug is passed through and slidably connected to the rear side of the connecting plate, and the plug is passed through and rotatably connected to the top rod.

[0010] As a further improvement of the utility model, a moving sleeve is fixedly connected to the front side of the connecting plate, and the nut is threadedly connected to the plug.

[0011] As a further improvement of the utility model, the left end of the spring lower seat is fixedly connected with an upper clamping disc, the right end of the connecting seat is fixedly connected with a lower clamping disc, and the lower clamping disc and the reset spring penetrate each other.

[0012] As a further improvement of the utility model, the nut pair is fixedly connected to the moving rod.

[0013] As a further improvement of the utility model, a fixing bolt passes through the outside of the installation sleeve and is threadedly connected, and the fixing bolt passes through the connecting seat and is threadedly connected.

[0014] As a further improvement of the utility model, the push rod passes through the hollow shaft and is fixedly connected to the spring lower seat.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0016] 1. In the utility model, firstly, the operation of the seesaw is realized through the mutual cooperation of the micro servo motor, the screw, the slide rail, the nut pair, the moving rod, the seesaw, the sliding block and the connecting plate, so as to drive the push rod to move, thereby achieving the wire loosening effect, and increasing the connectivity between the push rod and the seesaw, and being able to adjust the clamping force of the wire to different degrees according to needs.

[0017] 2. In the utility model, through the mutual cooperation of the movable sleeve, the first bevel gear, the second bevel gear, the fourth bevel gear and the hand wheel, when the micro servo motor fails or the power is off, the movable sleeve can be moved so that the fourth bevel gear contacts and meshes with the first bevel gear, thereby making it possible to manually loosen the wire of the wire clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the adjustment component of the utility model;

[0020] Figure 3 It is a schematic diagram of the seesaw of the utility model;

[0021] Figure 4 It is a cross-sectional view of the top rod of the utility model.

[0022] In the figure: 1. spring top seat; 2. return spring; 3. spring bottom seat; 4. upper clamping disc; 5. lower clamping disc; 6. connecting seat; 7. mounting sleeve; 8. fixing bolt; 9. mounting seat; 10. seesaw; 11. moving rod; 12. nut pair; 13. slide rail; 14. screw rod; 15. moving sleeve; 16. hand wheel; 17. micro servo motor; 18. bottom plate; 19. first bevel gear; 20. second bevel gear; 21. third bevel gear; 22. fourth bevel gear; 23. push rod; 24. plug; 25. nut; 26. connecting plate; 27. sliding block; 28. hollow shaft. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] Embodiment 1: A thread loosening device for a sewing machine, comprising a spring top seat 1 and a bottom plate 18, characterized in that: a hollow shaft 28 is fixedly connected to the middle of the left side of the spring top seat 1, a return spring 2 is fixedly connected to the outer periphery of the left side of the spring top seat 1, a spring lower seat 3 is fixedly connected to the left end of the return spring 2, a connecting seat 6 is passed through and fixedly connected to the left end of the hollow shaft 28, a push rod 23 is passed through and slidably connected to the middle of the left side of the connecting seat 6, a connecting plate 26 is provided at the left end of the push rod 23, a sliding block 27 is fixedly connected to the left side of the connecting plate 26, a rocker 10 is passed through and slidably connected to the left side of the sliding block 27, and a mounting plate 10 is passed through and provided on the left side of the connecting seat 6 Sleeve 7, the left side of the mounting sleeve 7 is fixedly connected with a mounting seat 9, and the mounting seat 9 is rotatably connected to the middle of the front and rear sides of the seesaw 10, the bottom of the seesaw 10 penetrates and is rotatably connected with a moving rod 11, the top left side of the bottom plate 18 is fixedly connected with a micro servo motor 17, the output end of the micro servo motor 17 is fixedly connected with a third bevel gear 21, the top right side of the bottom plate 18 is fixedly connected with a slide rail 13, the left side of the slide rail 13 penetrates and is rotatably connected with a screw rod 14, the outside of the screw rod 14 penetrates and is threadedly connected with a nut pair 12, and the nut pair 12 penetrates and is slidably connected with the slide rail 13, and the left end of the screw rod 14 is fixedly connected with a first bevel gear 19.

[0030] First, when loosening the wire, the micro servo motor 17 starts to drive the third bevel gear 21 to rotate, and through the transmission of the second bevel gear 20, the first bevel gear 19 is driven to rotate, and then the screw 14 is driven to rotate, so that the nut pair 12 drives the moving rod 11 to move to the left. Since the moving rod 11 is rotatably connected to the bottom of the seesaw 10, the bottom of the seesaw 10 is driven to move to the left, and the top of the seesaw 10 moves to the right, thereby driving the top rod 23 to move to the right. Since the top rod 23 is fixedly connected to the spring lower seat 3, the spring lower seat 3 and the upper clamping disc 4 move with the movement of the reset spring 2, so that the upper clamping disc 4 and the lower clamping disc 5 are separated, achieving the wire loosening effect, and the rotation of the screw 14 can achieve the clamping degree of different wire materials.

[0031] Embodiment 2: An adjustment component is provided in the middle of the top of the bottom plate 18, and the adjustment component includes a movable sleeve 15, the movable sleeve 15 penetrates and is slidably connected to the middle of the top of the bottom plate 18, the front side of the inner wall of the movable sleeve 15 penetrates and is rotatably connected to a second bevel gear 20, the rear side of the inner wall of the movable sleeve 15 penetrates and is rotatably connected to a fourth bevel gear 22, the rear end of the fourth bevel gear 22 is fixedly connected to a hand wheel 16, and the hand wheel 16 penetrates and is rotatably connected to the movable sleeve 15, the rear side of the connecting plate 26 penetrates and is slidably connected to a plug 24, and the plug 24 is connected to the top The rod 23 penetrates and is rotatably connected, the front side of the connecting plate 26 is fixedly connected with the moving sleeve 15, and the nut 25 is threadedly connected to the plug 24, the left end of the spring lower seat 3 is fixedly connected with the upper clamping disc 4, the right end of the connecting seat 6 is fixedly connected with the lower clamping disc 5, and the lower clamping disc 5 penetrates the reset spring 2, the nut pair 12 is fixedly connected to the moving rod 11, the outside of the mounting sleeve 7 penetrates and is threadedly connected with the fixing bolt 8, and the fixing bolt 8 penetrates and is threadedly connected to the connecting seat 6, and the top rod 23 penetrates the hollow shaft 28 and is fixedly connected to the spring lower seat 3.

[0032] The push rod 23 and the connecting plate 26 are connected by a plug 24 and a nut 25, so that the seesaw 10 can rotate when it moves toward the push rod 23, and the setting of the sliding block 27 enables the connecting plate 26 and the push rod 23 to slide with the seesaw 10 when the seesaw 10 moves, thereby improving the pushing effect of the push rod 23. After the wire is loosened, the micro servo motor 17 reverses, so that the spring top seat 1 moves in the opposite direction, so that the seesaw 10 rotates in the opposite direction, so that the pressure applied to the push rod 23 disappears, and the spring lower seat 3 and the upper clamping disc 4 are reset by the reset spring. The elastic potential energy released by the spring 2 can quickly contact the lower wire clamping disk 5, thereby realizing the wire clamping operation, and the connecting seat 6 can be conveniently installed and connected with the mounting seat 9 through the mounting sleeve 7 and the fixing bolt 8. When the micro servo motor 17 fails or the power is off, hold the hand wheel 16 and push the movable sleeve 15 to the front side, so that the second bevel gear 20 is disengaged from the third bevel gear 21 and the first bevel gear 19, and the fourth bevel gear 22 is connected to the first bevel gear 19, so that the first bevel gear 19 and the screw 14 are manually rotated to realize the wire loosening work of the wire clamping device.

[0033] Working principle: First, when loosening the wire, the micro servo motor 17 starts to drive the third bevel gear 21 to rotate, and through the transmission of the second bevel gear 20, the first bevel gear 19 is driven to rotate, and then the screw 14 is driven to rotate, so that the nut pair 12 drives the moving rod 11 to move to the left. Since the moving rod 11 is rotatably connected to the bottom of the seesaw 10, the bottom of the seesaw 10 is driven to move to the left, and the top of the seesaw 10 moves to the right, thereby driving the top rod 23 to move to the right. Since the top rod 23 is fixedly connected to the spring lower seat 3, the spring lower seat 3 and the upper clamping disc 4 move with the movement of the reset spring 2, so that the upper clamping disc 4 and the lower clamping disc 5 are separated to achieve the loosening effect, and the rotation of the screw 14 can achieve the clamping degree of different wire materials, and the top rod 23 and the connecting plate 26 are connected by the plug 24 and the nut 25, so that the seesaw 10 can rotate when it moves toward the top rod 23, and The setting of the sliding block 27 enables the connecting plate 26 and the push rod 23 to slide with the seesaw 10 when the seesaw 10 moves, thereby improving the pushing effect on the push rod 23. After the line is loosened, the micro servo motor 17 reverses, causing the spring top seat 1 to move in the opposite direction, so that the seesaw 10 rotates in the opposite direction, so that the pressure applied to the push rod 23 disappears, and the elastic potential energy released by the spring lower seat 3 and the upper clamping disc 4 through the reset spring 2 can quickly contact the lower clamping disc 5, thereby realizing the clamping operation, and the connecting seat 6 can be conveniently installed and connected with the mounting seat 9 through the mounting sleeve 7 and the fixing bolt 8. When the micro servo motor 17 fails or the power is off, hold the hand wheel 16 and push the moving sleeve 15 to the front side, so that the second bevel gear 20 is disengaged from the third bevel gear 21 and the first bevel gear 19, so that the fourth bevel gear 22 is connected to the first bevel gear 19, thereby manually rotating the first bevel gear 19 and the screw 14 to realize the line loosening work of the clamping device.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thread loosening device for a sewing machine, comprising a spring top seat (1) and a bottom plate (18), characterized in that: A hollow shaft (28) is fixedly connected to the middle of the left side of the spring top seat (1), a return spring (2) is fixedly connected to the outer periphery of the left side of the spring top seat (1), the left end of the return spring (2) is fixedly connected to the spring lower seat (3), the left end of the hollow shaft (28) passes through and is fixedly connected to a connecting seat (6), a push rod (23) passes through and is slidably connected to the middle of the left side of the connecting seat (6), a connecting plate (26) is provided at the left end of the push rod (23), a sliding block (27) is fixedly connected to the left side of the connecting plate (26), a rocker plate (10) is passed through and slidably connected to the left side of the sliding block (27), a mounting sleeve (7) is passed through and is provided on the left side of the connecting seat (6), a mounting seat (9) is fixedly connected to the left side of the mounting sleeve (7), and the mounting The seat (9) is rotatably connected to the middle of the front and rear sides of the seesaw (10); the bottom of the seesaw (10) is penetrated and rotatably connected with a moving rod (11); the top left side of the bottom plate (18) is fixedly connected with a micro servo motor (17); the output end of the micro servo motor (17) is fixedly connected with a third bevel gear (21); the top right side of the bottom plate (18) is fixedly connected with a slide rail (13); the left side of the slide rail (13) is penetrated and rotatably connected with a screw rod (14); the outside of the screw rod (14) is penetrated and threadedly connected with a nut pair (12); the nut pair (12) and the slide rail (13) are penetrated and slidably connected; the left end of the screw rod (14) is fixedly connected with a first bevel gear (19); and an adjustment component is arranged in the middle of the top of the bottom plate (18).

2. A thread loosening device for a sewing machine according to claim 1, characterized in that: The adjustment assembly comprises a movable sleeve (15), the movable sleeve (15) and the middle of the top of the bottom plate (18) are penetrated and slidably connected, the front side of the inner wall of the movable sleeve (15) is penetrated and rotatably connected with a second bevel gear (20), the rear side of the inner wall of the movable sleeve (15) is penetrated and rotatably connected with a fourth bevel gear (22), the rear end of the fourth bevel gear (22) is fixedly connected with a hand wheel (16), and the hand wheel (16) and the movable sleeve (15) are penetrated and rotatably connected.

3. The thread loosening device for a sewing machine according to claim 1, characterized in that: A plug (24) penetrates and is slidably connected to the rear side of the connecting plate (26), and the plug (24) penetrates and is rotatably connected to the top rod (23).

4. The thread loosening device for a sewing machine according to claim 1, characterized in that: The front side of the connecting plate (26) is fixedly connected with a moving sleeve (15), and the nut (25) is threadedly connected with the plug (24).

5. The thread loosening device for a sewing machine according to claim 1, characterized in that: The left end of the spring lower seat (3) is fixedly connected to an upper clamping disc (4), the right end of the connecting seat (6) is fixedly connected to a lower clamping disc (5), and the lower clamping disc (5) and the return spring (2) are penetrated.

6. The thread loosening device for a sewing machine according to claim 1, characterized in that: The nut pair (12) is fixedly connected to the moving rod (11).

7. The thread loosening device for a sewing machine according to claim 1, characterized in that: A fixing bolt (8) passes through the outside of the installation sleeve (7) and is threadedly connected thereto, and the fixing bolt (8) passes through the connecting seat (6) and is threadedly connected thereto.

8. The thread loosening device for a sewing machine according to claim 1, characterized in that: The push rod (23) passes through the hollow shaft (28) and is fixedly connected to the spring lower seat (3).

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