Thread tension device and sewing machine

Abstract

The application relates to a thread supply adjustable device and a sewing machine. The thread supply adjustable device comprises a first thread supply and take-up mechanism, a second thread supply and take-up mechanism and a driving mechanism. The first thread supply and take-up mechanism is used for intermittently pushing the lower thread of the sewing machine to control the thread supply amount of the lower thread. The second thread supply and take-up mechanism is independently arranged with the first thread supply and take-up mechanism and is used for intermittently pushing the upper thread of the sewing machine to control the thread supply amount of the upper thread. The driving mechanism is in driving connection with the first thread supply and take-up mechanism and the second thread supply and take-up mechanism, and the driving mechanism can actively provide power to the first thread supply and take-up mechanism and the second thread supply and take-up mechanism. The thread supply adjustable device is not only simple to operate, but also can accurately adjust the thread supply and take-up timing of the lower thread and the upper thread, so that the sewing machine can realize ideal stitch effects in actual production, and the sewing quality and the production efficiency are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewing machines, and in particular relates to an adjustable thread supply device and a sewing machine. Background Technology

[0002] The stability and aesthetics of stitches produced by industrial sewing machines primarily depend on the coordinated action of the thread tensioner and the thread supply system (including the thread take-up, take-up, and feed systems). The thread tensioner controls the thread tension by adjusting the positive pressure between the two tension plates, while the thread supply system precisely controls the amount of thread and the timing of thread feeding and take-up by adjusting the shape and position of the thread guide. The dynamic coordination between these two systems directly affects the stitch quality during the sewing process.

[0003] Currently, existing industrial overlock sewing machines typically use mechanical manual adjustment to regulate the amount of thread and the timing of thread feeding and take-up in the looper thread supply system. However, this traditional mechanical manual adjustment method requires skilled workers to manually adjust the machine, which is not only demanding and cumbersome but also makes it difficult to accurately control the thread feeding and take-up timing. This results in industrial overlock sewing machines failing to achieve ideal stitch results in actual production and affects sewing quality. Utility Model Content

[0004] In view of this, it is necessary to provide an adjustable thread supply device and a sewing machine for solving the above-mentioned technical problems.

[0005] An adjustable thread feed device is used in a sewing machine. The adjustable thread feed device includes:

[0006] The first thread feeding mechanism is used to intermittently push the lower looper thread of the sewing machine to regulate the amount of thread fed to the lower looper thread.

[0007] The second thread feeding and take-up mechanism, which is set independently of the first thread feeding and take-up mechanism, is used to intermittently push the upper looper thread of the sewing machine to regulate the amount of thread fed to the upper looper thread.

[0008] The drive mechanism is connected to the first wire feeding and take-up mechanism and the second wire feeding and take-up mechanism respectively, and the drive mechanism can actively provide power to the first wire feeding and take-up mechanism and the second wire feeding and take-up mechanism.

[0009] Understandably, by actively controlling the coordinated operation of the first and second thread feeding and take-up mechanisms through a drive mechanism, the amount of thread supplied to the lower and upper loopers can be adjusted. This allows for control of the thread feeding and take-up of the upper and lower loopers, making the adjustable thread feeding device not only easy to operate but also able to precisely adjust the thread feeding and take-up sequence of the lower and upper loopers. Consequently, the sewing machine can achieve ideal stitch results in actual production, significantly improving sewing quality and production efficiency.

[0010] In one embodiment, the first take-up mechanism includes a first threading plate and a first cam plate group. The first threading plate has a first thread-passing groove, which is at least partially housed within the first cam plate group for the lower looper thread to pass through. The first cam plate group is driven by the drive mechanism and can intermittently push the lower looper thread to slide in the first thread-passing groove under the drive mechanism.

[0011] Furthermore, the second take-up mechanism includes a second threading plate and a second cam plate group. The second threading plate has a second thread-passing groove, which is at least partially housed within the second cam plate group for the upper looper thread to pass through. The second cam plate group is connected to the drive mechanism and is capable of intermittently pushing the upper looper thread to slide in the second thread-passing groove under the drive mechanism.

[0012] It is understandable that the amount of thread supplied to the lower and upper loopers is adjusted by using a cam plate group to push the looper thread to slide on the threading plate. This allows the adjustable thread supply device to adjust the amount of thread for the lower and upper loopers over a wide range, thus enabling the sewing machine to achieve ideal stitch results under different working conditions.

[0013] In one embodiment, the first take-up mechanism further includes a plurality of first thread guides, each of which has a first thread guide hole for the lower bend needle thread to pass through.

[0014] Furthermore, the second take-up mechanism also includes a plurality of second thread guides, each of which has a second thread guide hole for the upper bend needle thread to pass through.

[0015] It is understandable that the first and second thread guides are used to guide the corresponding lower and upper looper threads respectively, which can prevent the upper and lower looper threads from breaking during the thread feeding and take-up adjustment.

[0016] In one embodiment, the adjustable thread supply device further includes a thread guide for fixing to the housing of the sewing machine;

[0017] At least a portion of the first cable guide is mounted on the cable guide frame, and at least a portion of the second cable guide is mounted on the cable guide frame.

[0018] In one embodiment, the mounting position of at least one of the first cable guides on the cable guide frame can be adjusted;

[0019] The mounting position of at least one of the second cable guides on the cable guide frame can be adjusted.

[0020] It is understandable that by adjusting the installation positions of the first and second wire guides on the wire guide frame, the adjustable wire supply device can adjust the guiding direction of the upper and lower looper wires, thus ensuring that no wire breakage accident occurs when the wire supply and take-up are adjusted for different amounts of wire in the upper and lower loopers.

[0021] In one embodiment, the drive mechanism includes a motor, which is connected to the first cam group and the second cam group respectively, and the motor is capable of simultaneously driving the first cam group and the second cam group to rotate.

[0022] Understandably, using a single motor to actively control the rotation of the first and second cam sets to regulate the feeding and take-up of the upper and lower loopers not only ensures the synchronization of the movements of the first and second cam sets and improves the coordination of the feeding and take-up of the upper and lower loopers, thus optimizing the stitch quality, but also simplifies the mechanical structure of the adjustable feeding device, reduces the complexity of transmission components and control systems, thereby reducing manufacturing costs and making it easier to control and maintain.

[0023] In one embodiment, the motor is configured as a variable frequency motor.

[0024] Understandably, by utilizing the structural characteristics of the variable frequency motor, the adjustable thread supply device can adjust the different timing sequences of thread feeding and take-up for the upper and lower loopers, thus enabling the sewing machine to achieve ideal stitch results under different working conditions.

[0025] In one embodiment, the drive mechanism further includes a first bushing and a second bushing, both of which are mounted on the rotating shaft of the motor.

[0026] The first bushing is connected and positioned to the rotating shaft and the first cam plate group by means of a keyway engagement, and the second bushing is connected and positioned to the rotating shaft and the second cam plate group by means of a keyway engagement.

[0027] In one embodiment, the adjustable thread supply device further includes a fixing frame for mounting to the housing of the sewing machine;

[0028] The motor body is mounted on the fixed frame.

[0029] This application also provides a sewing machine including the aforementioned adjustable thread supply device.

[0030] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0031] The thread-feeding adjustable device and sewing machine claimed in this application use a drive mechanism to actively control the coordinated operation of the first and second thread-feeding mechanisms, thereby regulating the amount of thread supplied to the lower and upper loopers. This allows for control of the thread supply and take-up of the upper and lower loopers, making the thread-feeding adjustable device not only easy to operate but also able to precisely adjust the thread supply and take-up sequence of the lower and upper loopers. As a result, the sewing machine can achieve ideal stitch results in actual production, significantly improving sewing quality and production efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a structural diagram of the sewing machine provided in this application.

[0034] Figure 2 This is a front view of the adjustable power supply device provided in this application.

[0035] Figure 3 This is a perspective view of the adjustable power supply device provided in this application.

[0036] Figure 4 Left view of the adjustable power supply device provided in this application.

[0037] Figure 5 This is a partial exploded view of the adjustable power supply device provided in this application.

[0038] Figure 6 This is a partial structural schematic diagram of the adjustable power supply device provided in this application.

[0039] Reference numerals: 100, Adjustable wire supply device; 10, First wire feeding and take-up mechanism; 11, First wire-attaching plate; 111, First wire-passing groove; 12, First cam plate group; 121, First cam plate; 13, First wire guide; 130, First wire-passing hole; 131, First wire-passing component A; 132, First wire-passing component B; 133, First wire-passing component C; 134, First wire-passing component D; 20, Second wire feeding and take-up mechanism; 21, Second wire-attaching plate; 211, Second wire-passing groove; 22, Second cam plate group; 221, First... 23. Second cam plate; 230. Second thread guide; 231. Second thread guide A; 232. Second thread guide B; 233. Second thread guide C; 234. Second thread guide D; 30. Drive mechanism; 31. Motor; 311. Rotating shaft; 3111. Shaft end nut; 312. Machine body; 32. First bushing; 33. Second bushing; 34. Spacer; 40. Thread guide frame; 50. Fixed frame; 51. Fixed base plate; 52. Fixed bracket; 200. Sewing machine; 210. Machine housing. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that when a component is said to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "located on" another component, it can be directly located on the other component or may have an intervening component. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or may have an intervening component.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] like Figure 1As shown, the thread supply adjustable device 100 claimed in this application is applied in a sewing machine 200, specifically mounted on the housing 210 of the sewing machine 200. It is used to adjust the thread supply of the lower looper thread (not shown) and upper looper thread (not shown) during sewing machine 200 operation, thereby controlling the thread take-up of the lower looper (not shown) and upper looper (not shown) in the sewing machine 200. Here, the sewing machine can specifically be an industrial overlock sewing machine, or other types of sewing machines that simultaneously have lower and upper looper threads. It should be noted that the upper looper is used to guide the upper looper thread to form an upper looper thread loop, while the lower looper is used to guide the lower looper thread to form a lower looper thread loop.

[0044] like Figure 1 As shown, the adjustable thread supply device 100 provided in this application includes a first thread feeding and take-up mechanism 10, a second thread feeding and take-up mechanism 20, and a drive mechanism 30. The first thread feeding and take-up mechanism 10 is used to intermittently push the lower looper thread of the sewing machine 200 to regulate the amount of lower looper thread supplied. The second thread feeding and take-up mechanism 20 is set independently of the first thread feeding and take-up mechanism 10 and is used to intermittently push the upper looper thread of the sewing machine 200 to regulate the amount of upper looper thread supplied. The drive mechanism 30 is connected to both the first thread feeding and take-up mechanism 10 and the second thread feeding and take-up mechanism 20, and the drive mechanism 30 can actively provide power to both the first thread feeding and take-up mechanism 10 and the second thread feeding and take-up mechanism 20. Here, the adjustment of the lower looper thread supply by the first thread feeding and take-up mechanism 10 and the adjustment of the upper looper thread supply by the second thread feeding and take-up mechanism 20 are independent of each other and do not interfere with each other.

[0045] As can be seen from the above, when the adjustable thread supply device 100 of this application is working, the drive mechanism 30 actively controls the coordinated work of the first thread supply and take-up mechanism 10 and the second thread supply and take-up mechanism 20 to realize the regulation of the amount of thread supplied to the lower looper thread and the upper looper thread. In this way, the thread supply and take-up of the upper and lower loopers can be controlled, making the adjustable thread supply device 100 not only easy to operate, but also able to accurately adjust the thread supply and take-up sequence of the lower and upper loopers. This enables the sewing machine 200 to achieve ideal stitch effects in actual production, significantly improving sewing quality and production efficiency.

[0046] It should be noted that when the first thread feeding and take-up mechanism 10 pushes the lower looper thread, the thread feeding control of the lower looper can be realized. When the first thread feeding and take-up mechanism 10 disengages from the lower looper thread, the lower looper thread will be conveyed along with the sewing fabric, thus realizing the take-up control of the lower looper. Similarly, the thread feeding and take-up control of the upper looper can also be applied.

[0047] like Figure 2 , Figure 3 and Figure 6As shown, in one embodiment, the first thread feeding and take-up mechanism 10 includes a first threading plate 11 and a first cam plate group 12. The first threading plate 11 has a first thread-passing groove 111, which is at least partially housed within the first cam plate group 12 for the lower looper thread to pass through. The first cam plate group 12 is connected to the drive mechanism 30 and can intermittently push the lower looper thread to slide in the first thread-passing groove 111 under the drive of the drive mechanism 30. In other words, the first thread feeding and take-up mechanism 10 in this embodiment uses the first cam plate group 12 to push the lower looper thread to slide on the first thread-passing groove 111 of the first threading plate 11 to control the thread feeding and take-up of the lower looper. In this process, by using the first cam plate group 12 to push the lower looper thread, the first thread feeding and take-up mechanism 10 can adjust the amount of thread fed to the lower looper over a wide range under the drive of the drive mechanism 30.

[0048] like Figure 2 , Figure 3 and Figure 6 As shown, in this embodiment, the first thread feeding and take-up mechanism 10 further includes a plurality of first thread guides 13, each of which has a first thread guide hole 130 for the lower looper thread to pass through. In other words, the first thread feeding and take-up mechanism 10 in this embodiment uses a plurality of first thread guides 13 to guide the lower looper thread, which can prevent the lower looper thread from breaking when the thread feeding and take-up amount is adjusted.

[0049] like Figures 2 to 4 and Figure 6 As shown, in this embodiment, the number of first thread guides 13 is configured to be four, sequentially defined as first thread guide A131, first thread guide B132, first thread guide C133, and first thread guide D134. The lower looper thread can pass sequentially through first thread guide A131, first thread guide B132, first thread guide C133, first thread take-off plate 11, and first thread guide D134 to reach the lower looper. Here, first thread guides A131 and first thread guides B132 are fixed to the housing 210 of the sewing machine 200. It should be noted that the specific positions of the first wire guide A131, first wire guide B132, first wire guide C133 and first wire guide D134 can be specifically set according to the usage requirements of the guided looper thread. Of course, in other embodiments, the number and specific arrangement position of the first wire guide 13 can also be adaptively improved according to the usage requirements. Since it is not the focus of this application, it will not be elaborated here.

[0050] like Figure 2 , Figure 3 and Figure 6As shown, in one embodiment, the second thread feeding and take-up mechanism 20 includes a second threading plate 21 and a second cam plate group 22. The second threading plate 21 has a second thread-passing groove 211, which is at least partially housed within the second cam plate group 22 for the upper looper thread to pass through. The second cam plate group 22 is connected to the drive mechanism 30 and can intermittently push the upper looper thread to slide in the second thread-passing groove 211 under the drive of the drive mechanism 30. In other words, the second thread feeding and take-up mechanism 20 in this embodiment uses the second cam plate group 22 to push the upper looper thread to slide on the second thread-passing groove 211 of the second threading plate 21 to control the thread feeding and take-up of the upper looper. By using the second cam plate group 22 to push the lower looper thread, the second thread feeding and take-up mechanism 20 can adjust the amount of thread fed to the upper looper thread over a wide range under the drive of the drive mechanism 30.

[0051] like Figure 2 , Figure 3 and Figure 6 As shown, in this embodiment, the second thread feeding and take-up mechanism 20 further includes a plurality of second thread guides 23, each of which has a second thread guide hole 230 for the upper looper thread to pass through. In other words, the second thread feeding and take-up mechanism 20 in this embodiment uses a plurality of second thread guides 23 to guide the lower looper thread, thus preventing thread breakage during thread feeding and take-up adjustment.

[0052] like Figure 2 , Figure 3 and Figure 6 As shown, in this embodiment, the number of second thread guides 23 is configured to be four, sequentially defined as second thread guide A231, second thread guide B232, second thread guide C233, and second thread guide D234. The upper looper thread can pass sequentially through second thread guide A231, second thread guide B232, second thread guide C233, second thread take-off plate 21, and second thread guide D234 to reach the upper looper. Here, the second thread guide C233 and the first thread guide C133 are configured with the same structure, and the second thread guide D234 is fixed to the housing 210 of the sewing machine 200. It should be noted that the specific positions of the second wire guide A231, second wire guide B232, second wire guide C233 and second wire guide D234 can be specifically set according to the usage requirements of guiding the upper looper thread. Of course, in other embodiments, the number and specific arrangement position of the second wire guide 23 can also be adaptively improved according to the usage requirements. Since it is not the focus of this application, it will not be elaborated here.

[0053] like Figures 2 to 4 and Figure 6As shown, in one embodiment, the adjustable thread supply device 100 further includes a thread guide 40, which is fixed to the housing 210 of the sewing machine 200; at least a portion of the first thread guide 13 is mounted on the thread guide 40, and at least a portion of the second thread guide 23 is mounted on the thread guide 40. Here, the first thread guide C133, the first thread guide D134, the second thread guide A231, the second thread guide B232, and the second thread guide C233 are fixedly mounted on the thread guide 40.

[0054] like Figure 2 , Figure 3 and Figure 6 As shown, in this embodiment, the mounting position of at least one first thread guide 13 on the thread guide frame 40 can be adjusted; the mounting position of at least one second thread guide 23 on the thread guide frame 40 can also be adjusted. This allows the adjustable thread supply device 100 to adjust the guiding direction of the upper and lower looper threads, ensuring that thread breakage does not occur when adjusting the thread supply and take-up for different thread quantities. Here, the mounting of the first thread guide D134, the first thread guide C133, and the second thread guide B232 on the thread guide frame 40 can be adjusted. Specifically, the first thread guide D134, the first thread guide C133, and the second thread guide B232 can be fixed to the thread guide frame 40 using screws passing through square slots, and the position adjustment is achieved by changing the fixing position of the screws.

[0055] like Figure 2 , Figure 3 and Figure 5 As shown, in one embodiment, the drive mechanism 30 includes a motor 31, which is connected to the first cam plate group 12 and the second cam plate group 22 respectively. The motor 31 can simultaneously drive the first cam plate group 12 and the second cam plate group 22 to rotate. In other words, this embodiment uses a single motor 31 to actively control the rotation of the first cam plate group 12 and the second cam plate group 22 to regulate the feeding and take-up of the upper and lower loopers. This not only ensures the synchronicity of the movements of the first cam plate group 12 and the second cam plate group 22, improving the coordination of the feeding and take-up of the upper and lower loopers and optimizing the stitch quality, but also simplifies the mechanical structure of the adjustable feeding device 100, reduces the complexity of the transmission components and control system, lowers manufacturing costs, and facilitates control and maintenance.

[0056] In this embodiment, the motor 31 is configured as a variable frequency motor, allowing the rotational speed of the first cam group 12 and the second cam group 22 to be adaptively adjusted according to the control signal. This enables the adjustable thread feeding device 100 to adjust the different timing sequences of thread feeding and take-up for the upper and lower loopers, thus ensuring that the sewing machine 200 can achieve ideal stitch results under different working conditions. Here, the motor 31 controls the first cam group 12 and the second cam group 22 to rotate at a uniform speed. Of course, in other embodiments, the motor 31 can also control the first cam group 12 and the second cam group 22 to rotate at a non-uniform speed to achieve the thread feeding and take-up actions of the upper and lower loopers, which will not be elaborated here.

[0057] like Figure 2 and Figure 5 As shown, in this embodiment, the drive mechanism 30 further includes a first bushing 32 and a second bushing 33, both of which are mounted on the rotating shaft 311 of the motor 31. The first bushing 32 is connected and positioned to the rotating shaft 311 and the first cam plate group 12 via keyway engagement, and the second bushing 33 is connected and positioned to the rotating shaft 311 and the second cam plate group 22 via keyway engagement. This allows the motor 31 to simultaneously control the rotation of the first cam plate group 12 and the second cam plate group 22 via the first bushing 32 and the second bushing 33 when the drive mechanism 30 is operating.

[0058] like Figure 2 and Figure 5 As shown, in this embodiment, the first cam plate group 12 includes two first cam plates 121, the second cam plate group 22 includes two second cam plates 221, and a spacer 34 is fitted between the first bushing 32 and the second bushing 33 on the rotating shaft 311 of the motor 31. In the axial direction of the rotating shaft 311, one of the second cam plates 221 is pressed and limited to the body part 312 of the motor 31 by the second bushing 33, and the other second cam plate 221 is pressed and limited to the second bushing 33 by the spacer 34. One of the first cam plates 121 is pressed and limited to the spacer 34 by the first bushing 32, and the other second cam plate 221 is pressed and limited to the first bushing 32 by the shaft end nut 3111 installed on the rotating shaft 311 of the motor 31. This enables the first cam plate group 12 and the second cam plate group 22 to be installed on the rotating shaft 311 of the motor 31 through the first bushing 32 and the second bushing 33.

[0059] like Figures 2 to 4 and Figure 6As shown, in one embodiment, the adjustable thread supply device 100 further includes a fixed frame 50, on which the body portion 312 of the motor 31 is mounted, and the fixed frame 50 is used to mount to the housing 210 of the sewing machine 200. That is, the adjustable thread supply device 100 of this embodiment can be assembled to the housing 210 of the sewing machine 200 with the fixed frame 50 as the mounting base.

[0060] like Figure 6 As shown, in this embodiment, the fixed frame 50 includes a fixed base plate 51 and two fixed frames 52. The two fixed frames 52 are arranged in parallel and are respectively vertically mounted on the fixed base plate 51. The body part 312 of the motor 31 is placed on the fixed base plate 51 and is respectively connected to the two fixed frames 52. The wire guide 40 of the adjustable wire supply device 100 is fixed to one of the fixed frames 52 facing the housing 210.

[0061] In addition, this application also provides a sewing machine 200, including the above-described adjustable thread supply device 100.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A thread tension device for use in a sewing machine (200), characterized in that, The adjustable power supply device (100) includes: The first thread feeding mechanism (10) is used to intermittently push the lower looper thread of the sewing machine (200) to regulate the amount of thread fed to the lower looper thread; The second thread feeding and take-up mechanism (20) is set independently of the first thread feeding and take-up mechanism (10) and is used to intermittently push the upper looper thread of the sewing machine (200) to regulate the amount of thread fed to the upper looper thread; The drive mechanism (30) is connected to the first wire feeding and taking-up mechanism (10) and the second wire feeding and taking-up mechanism (20) respectively, and the drive mechanism (30) can actively provide power to the first wire feeding and taking-up mechanism (10) and the second wire feeding and taking-up mechanism (20).

2. The device of claim 1, wherein, The first take-up mechanism (10) includes a first threading plate (11) and a first cam plate group (12). The first threading plate (11) has a first threading groove (111). The first threading groove (111) is at least partially housed in the first cam plate group (12) for the lower looper thread to pass through. The first cam plate group (12) is connected to the drive mechanism (30) and can intermittently push the lower looper thread to slide in the first threading groove (111) under the drive of the drive mechanism (30). The second take-up mechanism (20) includes a second threading plate (21) and a second cam plate group (22). The second threading plate (21) has a second threading groove (211). The second threading groove (211) is at least partially housed in the second cam plate group (22) for the upper looper thread to pass through. The second cam plate group (22) is connected to the drive mechanism (30) and can intermittently push the upper looper thread to slide in the second threading groove (211) under the drive of the drive mechanism (30).

3. The device of claim 2, wherein, The first thread feeding mechanism (10) further includes a plurality of first thread guides (13), each of which has a first thread guide hole (130) for the lower bent needle thread to pass through. Furthermore, the second take-up mechanism (20) also includes a plurality of second thread guides (23), each of which has a second thread guide hole (230) for the upper bent needle thread to pass through.

4. The device of claim 3, wherein, The adjustable thread supply device (100) also includes a thread guide (40) for fixing to the housing (210) of the sewing machine (200); At least a portion of the first cable guide (13) is mounted on the cable guide frame (40), and at least a portion of the second cable guide (23) is mounted on the cable guide frame (40).

5. The device of claim 4, wherein, The mounting position of at least one of the first wire guides (13) on the wire guide frame (40) can be adjusted; The mounting position of at least one of the second wire guides (23) on the wire guide frame (40) can be adjusted.

6. The device of claim 2, wherein, The drive mechanism (30) includes a motor (31), which is connected to the first cam plate group (12) and the second cam plate group (22) respectively. The motor (31) can simultaneously drive the first cam plate group (12) and the second cam plate group (22) to rotate.

7. The device of claim 6, wherein, The motor (31) is configured as a variable frequency motor.

8. The device of claim 6, wherein, The drive mechanism (30) further includes a first bushing (32) and a second bushing (33), both of which are mounted on the rotating shaft (311) of the motor (31); The first bushing (32) is connected and limited to the rotating shaft (311) and the first cam plate group (12) respectively by keyway engagement, and the second bushing (33) is connected and limited to the rotating shaft (311) and the second cam plate group (22) respectively by keyway engagement.

9. The device of claim 6, wherein, The adjustable thread supply device (100) also includes a fixing frame (50) for mounting to the housing (210) of the sewing machine (200); The motor (31) body (312) is mounted on the fixed frame (50).

10. A sewing machine characterized by comprising: Includes the adjustable power supply device (100) according to any one of claims 1 to 9.

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