Thread end clamping device and sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and discloses a thread end clamping device and a sewing machine. The device comprises a fixing frame, a driving assembly and a clamping assembly, the fixing frame is configured to be installed on a machine head of the sewing machine, the driving assembly comprises a first driving mechanism and a second driving mechanism, the first driving mechanism is rotatably arranged on the fixing frame, and the second driving mechanism is connected to the output end of the first driving mechanism; the clamping assembly comprises two clamping arms connected to the output end of the second driving mechanism, and under driving of the second driving mechanism, the two clamping arms can be close to or away from each other in the X direction so as to clamp or loosen the sewing thread end. Under driving of the first driving mechanism, the clamping assembly can move in the Y direction and can extend to the position below the needle rod so as to ensure that the clamping assembly can clamp the sewing thread end. The device is reasonable in structure, convenient to install and high in reliability, and the situation that the sewing thread end cannot be clamped due to the fact that the position of the sewing thread end deviates is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a thread clamping device and a sewing machine. Background Art

[0002] When using a fully automatic thread trimmer on a sewing machine or other equipment, it is often the case that the thread end is not long enough, resulting in the thread not being able to be hooked onto the bottom thread during the next stitch, or the thread coming off the needle, preventing proper sewing. Therefore, it is necessary to install a thread end clamp on the sewing machine to hold the sewing thread for the next stitch.

[0003] In conventional thread clamping devices, a movable hook, driven by a solenoid valve or pneumatic cylinder, extends forward to the outer edge of the sewing thread and is then pushed backward by the solenoid valve or pneumatic cylinder. During this backward movement, the movable hook can bring the sewing thread back and clamp it with upper and lower thread clamps. However, if the sewing thread is out of the movable hook's range of motion, the hook cannot bring the sewing thread back and cannot clamp the thread, thus affecting subsequent sewing operations. Utility Model Content

[0004] The purpose of the utility model is to provide a thread clamping device and a sewing machine, which have a reasonable structure and high reliability, can stably clamp the sewing thread end, and will not cause the sewing thread end to be unable to be clamped.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In one aspect, a thread clamping device is provided for clamping an end of a sewing thread passing through a needle bar, comprising:

[0007] a fixed frame configured to be disposed on a head of a sewing machine;

[0008] A driving assembly comprising a first driving mechanism and a second driving mechanism, wherein the first driving mechanism is rotatably disposed on the fixing frame, and the second driving mechanism is connected to an output end of the first driving mechanism;

[0009] a clamping assembly comprising two clamping arms, both of which are connected to the output end of the second driving mechanism, and under the drive of the second driving mechanism, the two clamping arms can move closer to or farther from each other along the X direction to clamp or release the sewing thread end;

[0010] Driven by the first driving mechanism, the clamping assembly can move along the Y direction and can extend below the needle rod, and the X direction is perpendicular to the Y direction.

[0011] As an optional solution for the thread end clamping device, the fixing frame includes:

[0012] a fixing plate configured to be disposed on a head of the sewing machine;

[0013] Two side plates are respectively arranged on both sides of the fixed plate. The first driving mechanism is located between the two side plates and is rotatably arranged on the two side plates.

[0014] As an optional solution for the thread end clamping device, a positioning hole is provided on the side plate, and a rotating shaft is provided on the first driving mechanism, and the rotating shaft is rotatably inserted into the positioning hole;

[0015] The thread end clamping device also includes a fastener, a strip hole is provided on the side plate, and a fastening hole is provided on the first driving mechanism. The fastener passes through the strip hole and extends into the fastening hole to fix the first driving mechanism on the side plate.

[0016] As an optional solution for the thread end clamping device, the fixing frame further includes a reinforcing plate, which is connected between the two side plates and is also configured to be connected to the head of the sewing machine.

[0017] As an optional solution for the thread end clamping device, the driving assembly also includes a driving shaft, which extends along the Y direction and is arranged between the output end of the first driving mechanism and the second driving mechanism. The driving shaft can move along the Y direction under the drive of the first driving mechanism.

[0018] As an optional solution for the thread end clamping device, a connecting seat is provided at one end of the driving shaft away from the first driving mechanism, and the second driving mechanism is provided on the connecting seat.

[0019] As an optional solution for the thread end clamping device, a plurality of drive shafts are arranged at intervals along the X direction.

[0020] As an optional solution for the thread end clamping device, a guide assembly is provided between the second driving mechanism and the clamping assembly, and the guide assembly includes:

[0021] A guide portion is provided on the second driving mechanism, and a guide groove is provided on the guide portion;

[0022] Two guide blocks are slidably arranged in the guide groove along the X direction and are both connected to the output end of the second driving mechanism; the two clamping arms are arranged on the two guide blocks in a one-to-one correspondence.

[0023] As an optional solution for the thread end clamping device, an anti-slip structure is provided on the side of the clamping arm facing the sewing thread end.

[0024] On the other hand, a sewing machine is provided, comprising any one of the above-mentioned thread clamping devices and a control device, wherein the first driving mechanism and the second driving mechanism are both connected to the control device.

[0025] Beneficial effects of the utility model:

[0026] The utility model provides a thread clamping device for clamping one end of a sewing thread passing through a needle bar to facilitate the smooth progress of subsequent sewing operations. The device comprises a fixed frame, a drive assembly, and a clamping assembly. The fixed frame is configured to be mounted on the head of a sewing machine. The drive assembly comprises a first drive mechanism and a second drive mechanism. The first drive mechanism is rotatably mounted on the fixed frame, and the second drive mechanism is connected to the output end of the first drive mechanism. The clamping assembly comprises two clamping arms, both connected to the output end of the second drive mechanism. Driven by the second drive mechanism, the two clamping arms can move toward or away from each other in the X direction to clamp or release the sewing thread. Simultaneously, driven by the first drive mechanism, the clamping assembly can move in the Y direction and extend below the needle bar to ensure that the clamping assembly can clamp the sewing thread. The device has a reasonable structure and is easy to install. It is applicable to different models of sewing machines and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall schematic diagram of a sewing machine provided by an embodiment of the present utility model;

[0028] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0029] Figure 3 This is an overall schematic diagram of the thread clamping device provided by the specific embodiment of the utility model. Figure 1 ;

[0030] Figure 4 This is an overall schematic diagram of the thread clamping device provided by the specific embodiment of the utility model. Figure 2 ;

[0031] Figure 5 It is a side view of the thread end clamping device provided by the specific embodiment of the present utility model.

[0032] In the picture:

[0033] 100, needle bar; 200, machine head;

[0034] 1. Fixed frame;

[0035] 11. Fixed plate; 12. Side plate; 121. Positioning hole; 122. Strip hole; 13. Reinforcement plate;

[0036] 2. Drive components;

[0037] 21. First driving mechanism; 211. Rotating shaft; 212. Fastening hole;

[0038] 22. Second driving mechanism;

[0039] 23. Drive shaft; 24. Connecting seat; 241. First plate; 242. Second plate;

[0040] 25. Guide assembly; 251. Guide portion; 252. Guide block;

[0041] 3. Clamping assembly; 31. Clamping arm;

[0042] 4. Fasteners. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0044] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0047] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0048] like Figures 1 to 5 As shown, this embodiment provides a thread clamping device for clamping one end of a sewing thread passing through a needle bar 100 to facilitate the smooth progress of subsequent sewing operations. The device includes a fixed frame 1, a drive assembly 2, and a clamping assembly 3. The fixed frame 1 is configured to be mounted on the head 200 of the sewing machine. The drive assembly 2 includes a first drive mechanism 21 and a second drive mechanism 22. The first drive mechanism 21 is rotatably mounted on the fixed frame 1, and the second drive mechanism 22 is connected to the output end of the first drive mechanism 21. The clamping assembly 3 includes two clamping arms 31, both of which are connected to the output end of the second drive mechanism 22. Under the drive of the second drive mechanism 22, the two clamping arms 31 can move toward or away from each other in the X direction to clamp or release the sewing thread. At the same time, under the drive of the first drive mechanism 21, the clamping assembly 3 can move in the Y direction and extend below the needle bar 100 to ensure that the clamping assembly 3 can clamp the sewing thread. The device has a reasonable structure and is easy to install, can be applied to sewing machines of different models, and has high reliability.

[0049] Exemplarily, the first driving mechanism 21 is a linear driving motor, and the second driving mechanism 22 is a driving cylinder.

[0050] Alternatively, as Figure 3 As shown, the fixed frame 1 includes a fixed plate 11 and two side plates 12. The fixed plate 11 is configured to be set on the head 200 of the sewing machine. The two side plates 12 are respectively arranged on both sides of the fixed plate 11. The first driving mechanism 21 is located between the two side plates 12 and is rotatably arranged on the two side plates 12. It has a reasonable structure and high space utilization.

[0051] Specifically, the fixing plate 11 has a first connection hole, through which a bolt or screw passes and is screwed onto the handpiece 200 to achieve a detachable connection between the fixing frame 1 and the handpiece 200. The fixing plate 11 also has a second connection hole, and the side plate 12 has a third connection hole. Bolts or screws pass through the second and third connection holes, respectively, to detachably connect the side plate 12 to the fixing plate 11. Alternatively, in other embodiments, the side plate 12 may be welded to the fixing plate 11.

[0052] Further, continue to refer to Figure 3 A positioning hole 121 is provided on the side plate 12, and a rotating shaft 211 is provided on the first drive mechanism 21. The rotating shaft 211 is rotatably inserted into the positioning hole 121. The thread clamping device also includes a fastener 4. A strip hole 122 is also provided on the side plate 12, and a fastening hole 212 is provided on the first drive mechanism 21. The fastener 4 passes through the strip hole 122 and extends into the fastening hole 212 to fix the first drive mechanism 21 to the side plate 12. With the above arrangement, the first drive mechanism 21 can rotate between the two side plates 12 around the axis direction of the rotating shaft 211 to adjust the direction of the output end of the first drive mechanism 21, ensure that the clamping device can extend under the needle bar 100, and ensure that the sewing thread can be clamped. When the first drive mechanism 21 is rotated and adjusted into place, the fastener 4 is passed through the strip hole 122 and extends into the fastening hole 212 to fix the first drive mechanism 21.

[0053] Specifically, a rotating shaft 211 and a fastening hole 212 are provided on one side of the first driving mechanism 21 close to the side plate 12. For example, the fastener 4 is a screw or a bolt, and the fastening hole 212 is a threaded hole.

[0054] Optionally, continue with reference to Figure 3 The fixing frame 1 further includes a reinforcing plate 13, which is connected between the two side plates 12 and is configured to be connected to the head 200 of the sewing machine. The provision of the reinforcing plate 13 can further improve the connection stability between the fixing frame 1 and the head 200.

[0055] Specifically, a fourth connecting hole is also formed on the reinforcing plate 13 , and a bolt or screw passes through the fourth connecting hole and is screwed onto the machine head 200 .

[0056] Alternatively, as Figure 3 As shown, the drive assembly 2 further includes a drive shaft 23, which extends along the Y direction and is disposed between the output end of the first drive mechanism 21 and the second drive mechanism 22. The drive shaft 23 is driven by the first drive mechanism 21 to move along the Y direction. The provision of the drive shaft 23 can provide a guide for the movement of the second drive mechanism 22.

[0057] Furthermore, if Figure 4As shown, a connecting seat 24 is provided at one end of the driving shaft 23 away from the first driving mechanism 21, and the second driving mechanism 22 is provided on the connecting seat 24. The provision of the connecting seat 24 can improve the stability of the provision of the second driving mechanism 22.

[0058] Specifically, in this embodiment, the connecting seat 24 includes a first plate 241 and a second plate 242. The first plate 241 is connected to one end of the driving shaft 23, and the second plate 242 is connected to the first plate 241. The second plate 242 and the first plate 241 are L-shaped, and the second driving mechanism 22 is detachably arranged on the second plate 242 by bolts.

[0059] Optionally, a plurality of driving shafts 23 are arranged at intervals along the X direction to improve the stability of the second driving mechanism 22 moving along the Y direction.

[0060] For example, in this embodiment, two drive shafts 23 are arranged at intervals; in other embodiments, the number of drive shafts 23 can be set as needed and is not specifically limited here.

[0061] Optionally, refer to Figures 3 to 5 A guide assembly 25 is provided between the second drive mechanism 22 and the clamping assembly 3. The guide assembly 25 comprises a guide portion 251 and two guide blocks 252. The guide portion 251 is provided on the second drive mechanism 22 and has a guide groove formed therein. The two guide blocks 252 are slidably disposed in the guide groove along the X direction and are both connected to the output end of the second drive mechanism 22. The two clamping arms 31 are provided on the two guide blocks 252 in a one-to-one correspondence. This arrangement can provide guidance for the two clamping arms 31 to move toward or away from each other, ensuring that the sewing thread ends can be clamped.

[0062] Optionally, the side of the clamping arm 31 facing the sewing thread head is provided with an anti-slip structure. Specifically, the anti-slip structure is a non-slip pad, such as a rubber pad, provided on the side of the clamping arm 31 facing the sewing thread head; or, the anti-slip structure is a non-slip protrusion provided on the side of the clamping arm 31 facing the sewing thread head. The non-slip protrusion can be a dot-shaped protrusion or a patterned protrusion of any shape. Its function is to increase the contact friction between the clamping arm 31 and the sewing thread head, preventing the sewing thread head from moving. The specific form of the anti-slip structure is referred to the prior art and is not specifically limited in this embodiment, as long as it can increase friction.

[0063] In addition, this embodiment also provides a sewing machine, which includes the above-mentioned thread clamping device and a control device (not shown in the figure), wherein the first drive mechanism 21 and the second drive mechanism 22 are both connected to the control device. When each stitch is completed, the control device can control the activation of the second drive mechanism 22, causing the two clamping arms 31 to move away from each other in the X direction. At the same time, the control device controls the activation of the first drive mechanism 21, driving the second drive mechanism 22 and the two clamping walls to move in the Y direction to below the needle bar 100; under the control of the control device, the two clamping arms 31 then approach each other in the X direction to clamp the sewing thread end. Because the distance between the two clamping arms 31 when they are away from each other is large, it can ensure that the sewing thread end is within the clamping range of the clamping assembly 3, thereby ensuring that the two clamping arms 31 can clamp the sewing thread end each time they approach each other, thereby solving the problem of being unable to clamp the sewing thread end due to the displacement of the sewing thread end. In addition, this sewing machine has all the beneficial effects of the above-mentioned thread clamping device, which will not be repeated here.

[0064] Exemplarily, the control device is a single-chip microcomputer disclosed in the prior art, and a relevant control program is burned into the single-chip microcomputer. In combination with the control program, the control device can control the opening and closing of the first drive mechanism 21 and the second drive mechanism 22. Specifically, the single-chip microcomputer is an STM32 controller, and the relevant control program refers to the prior art.

[0065] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A thread clamping device for clamping a sewing thread through one end of a needle rod (100), characterized in that: include: A fixing frame (1) is configured to be disposed on a head (200) of a sewing machine; A drive assembly (2) comprising a first drive mechanism (21) and a second drive mechanism (22), wherein the first drive mechanism (21) is rotatably disposed on the fixed frame (1), and the second drive mechanism (22) is connected to an output end of the first drive mechanism (21); A clamping assembly (3) comprising two clamping arms (31), both of the clamping arms (31) being connected to the output end of the second driving mechanism (22), and under the drive of the second driving mechanism (22), the two clamping arms (31) can move closer to or farther from each other along the X direction to clamp or release the sewing thread end; Driven by the first driving mechanism (21), the clamping assembly (3) can move along the Y direction and can extend below the needle rod (100), and the X direction is perpendicular to the Y direction.

2. The thread end clamping device according to claim 1, characterized in that: The fixing frame (1) comprises: a fixing plate (11) configured to be disposed on a head (200) of the sewing machine; Two side plates (12) are respectively arranged on both sides of the fixed plate (11); the first driving mechanism (21) is located between the two side plates (12) and is rotatably arranged on the two side plates (12).

3. The thread end clamping device according to claim 2, characterized in that: A positioning hole (121) is provided on the side plate (12), and a rotating shaft (211) is provided on the first driving mechanism (21), and the rotating shaft (211) is rotatably inserted into the positioning hole (121); The thread end clamping device further comprises a fastener (4); a strip-shaped hole (122) is further provided on the side plate (12); a fastening hole (212) is provided on the first driving mechanism (21); the fastener (4) passes through the strip-shaped hole (122) and extends into the fastening hole (212) to fix the first driving mechanism (21) to the side plate (12).

4. The thread end clamping device according to claim 2, characterized in that: The fixing frame (1) further comprises a reinforcing plate (13), wherein the reinforcing plate (13) is connected between the two side plates (12), and the reinforcing plate (13) is also configured to be connected to the head (200) of the sewing machine.

5. The thread end clamping device according to claim 1, characterized in that: The driving assembly (2) further includes a driving shaft (23), which extends along the Y direction and is arranged between the output end of the first driving mechanism (21) and the second driving mechanism (22). The driving shaft (23) is capable of moving along the Y direction under the drive of the first driving mechanism (21).

6. The thread end clamping device according to claim 5, characterized in that: A connecting seat (24) is provided at one end of the driving shaft (23) away from the first driving mechanism (21), and the second driving mechanism (22) is provided on the connecting seat (24).

7. The thread end clamping device according to claim 5, characterized in that: A plurality of drive shafts (23) are arranged at intervals along the X direction.

8. The thread end clamping device according to claim 1, characterized in that: A guide assembly (25) is provided between the second driving mechanism (22) and the clamping assembly (3), and the guide assembly (25) comprises: A guide portion (251) is provided on the second driving mechanism (22), and a guide groove is provided on the guide portion (251); Two guide blocks (252) are slidably arranged in the guide groove along the X direction and are both connected to the output end of the second driving mechanism (22); the two clamping arms (31) are arranged on the two guide blocks (252) in a one-to-one correspondence.

9. The thread end clamping device according to any one of claims 1 to 8, characterized in that: The side of the clamping arm (31) facing the sewing thread head is provided with an anti-slip structure.

10. A sewing machine, characterized in that: It comprises a thread end clamping device as claimed in any one of claims 1 to 9 and a control device, wherein the first driving mechanism (21) and the second driving mechanism (22) are both connected to the control device.

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