Bottom thread control mechanism capable of adjusting thread supply amount and sewing machine

Abstract

The utility model discloses a bottom thread control mechanism capable of adjusting thread supply quantity and a sewing machine in the technical field of sewing machines. The limiting spring piece is located on one side of the mounting frame, one end of the limiting spring piece is detachably and fixedly connected with the mounting frame, and the relative position of the limiting spring piece and the mounting frame can be adjusted; the wire bonding frame comprises a connecting plate and a mounting plate which are fixedly connected, the connecting plate is located above the limiting spring piece and rotationally connected with the mounting frame, a limiting clamping groove is formed in the connecting plate, and an elastic clamping jaw matched with the limiting clamping groove is formed at the other end of the limiting spring piece. According to the utility model, the position-adjustable limiting spring piece is used for limiting the thread-bonding frame at different positions, so that the thread passing holes in the thread-bonding frame have different distances relative to the thread-bonding position of the thread-bonding cam, not only is the adjustment of the maximum thread supply amount of the bottom thread realized, but also the arching and the thread breakage are avoided during sewing, and the stitch skipping rate is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, concretely relates to a bottom thread control mechanism and sewing machine that can adjust thread supply amount. BACKGROUND

[0002] In the current sewing machine, the bottom thread supply is usually completed by the periodic rotation of the thread hitting cam to draw out the thread on the thread hitting frame, such as the patent document with the announcement number CN204780199U. This bottom thread supply method makes the relative position of the thread hitting frame and the thread hitting cam constant when the whole bottom thread control mechanism is in the working position, so that the same bottom thread supply amount can only be obtained during the thread hitting operation.

[0003] Before the large-scale use of fabrics with different characteristics, such as thin, slippery, elastic, soft, and fabrics with multiple characteristics, the sewing machine using the existing bottom thread control mechanism shows relatively wide applicability when sewing most fabrics. However, with the emergence of more and more new fabrics with various characteristics, and the different thread supply amounts required by different fabrics during sewing, the sewing machine using the existing bottom thread control mechanism may easily cause thread breakage or arching of the fabric during sewing of new fabrics.

[0004] Therefore, how to realize the adjustment of the bottom thread supply amount has become a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0005] Therefore, the utility model aims to provide a bottom thread control mechanism that can adjust the thread supply amount to solve the technical problem that the existing bottom thread control mechanism cannot adjust the bottom thread supply amount.

[0006] The utility model adopts the technical scheme of a bottom thread control mechanism that can adjust the thread supply amount, comprising:

[0007] A mounting frame that can be fixedly connected with a machine shell;

[0008] A limiting spring sheet located on one side of the mounting frame, one end of the limiting spring sheet being detachably fixedly connected with the mounting frame, and the relative position of the limiting spring sheet and the mounting frame being adjustable;

[0009] A thread hitting frame comprising a fixedly connected connecting plate and mounting plate, the connecting plate being located above the limiting spring sheet and being rotationally connected with the mounting frame, and the mounting plate being formed with an avoidance groove matched with the thread hitting cam;

[0010] Among them, the connecting plate is provided with a limiting clamping groove, and the other end of the limiting spring sheet is formed with an elastic clamping jaw matched with the limiting clamping groove.

[0011] Preferably, a connecting threaded hole is formed on the mounting frame, one end of the limiting spring sheet is provided with an adjusting long slot hole, the length and width of the adjusting long slot hole are both larger than the diameter of the connecting threaded hole, one side of the limiting spring sheet is provided with a fastening screw, one end of the fastening screw passes through the adjusting long slot hole and is threadedly connected in the connecting threaded hole.

[0012] Preferably, the number of the connecting threaded holes is two, and the adjusting long slot hole and the connecting threaded hole are in one-to-one correspondence.

[0013] Preferably, a first long slot hole is formed on the mounting frame, one end of the limiting spring sheet is provided with an adjusting long slot hole, the length direction of the first long slot hole is perpendicular to the length direction of the adjusting long slot hole, one side of the limiting spring sheet is provided with a fastening bolt, one end of the fastening bolt sequentially passes through the adjusting long slot hole and the first long slot hole and is fixedly connected with the fastening nut.

[0014] Preferably, the number of the adjusting long slot holes is two.

[0015] Preferably, a connecting through hole is formed on the connecting plate, a shaft position screw for enabling the connecting plate and the mounting frame to relatively rotate is arranged in the connecting through hole, and the limiting clamping groove is arranged along the radial direction of the connecting through hole.

[0016] Preferably, the limiting spring sheet comprises a connecting section and a limiting section, the connecting section is detachably fixedly connected with the mounting frame, one end of the limiting section is fixedly connected with the connecting section, and the other end of the limiting section is formed with an elastic clamping jaw protruding towards the connecting plate.

[0017] Preferably, one side of the elastic clamping jaw away from the connecting section is formed with a first guide inclined surface for enabling the elastic clamping jaw to enter the limiting clamping groove, and one side of the elastic clamping jaw close to the connecting section is formed with a second guide inclined surface for enabling the elastic clamping jaw to exit the limiting clamping groove.

[0018] Preferably, one end of the connecting section close to the limiting section is formed with a limiting stop surface for forming a stop cooperation with the connecting plate.

[0019] Preferably, the threader further comprises a wrench, the connecting plate is located on one side of the mounting plate, and the wrench is located on the other side of the mounting plate.

[0020] The second purpose of the utility model is to provide a sewing machine comprising the bobbin thread control mechanism capable of adjusting the thread supply amount.

[0021] The utility model has the advantages of:

[0022] The utility model discloses a way of adjusting the relative position of the wire frame and the wire cam, installs the limit spring sheet below the wire frame, and the elastic clamping jaw of limit spring sheet is elastically clamped in the limit card slot of wire frame, and the detachable fixed connection of limit spring sheet and mounting frame is cooperated, can change the relative position of limit spring sheet and mounting frame, changes the relative position of wire frame and wire cam when working state, and then changes the maximum thread supply of the bottom thread, makes the sewing machine when sewing different face fabric can provide different bottom thread supply, thereby reducing the arching and broken thread phenomenon of sewing process. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is first angle structure schematic drawing of the bottom thread control mechanism of the utility model that can adjust the thread supply amount.

[0024] Figure 2 It is second angle structure schematic drawing of the bottom thread control mechanism of the utility model that can adjust the thread supply amount.

[0025] Figure 3 It is the three -dimensional schematic diagram of wire frame.

[0026] Figure 4 It is first angle structure schematic drawing of limit spring sheet.

[0027] Figure 5 It is second angle structure schematic drawing of limit spring sheet.

[0028] Figure 6 It is one of mounting frame structure schematic drawing.

[0029] Figure 7 It is second of mounting frame structure schematic drawing.

[0030] Figure 8 It is the structure schematic drawing of sewing machine of the utility model.

[0031] Mark explanation in drawing:

[0032] 100, mounting frame, 110, connecting thread hole, 120, first long slot hole, 130, first plate body, 140, second plate body,

[0033] 200, limit spring sheet, 210, connecting section, 211, adjusting long slot hole, 212, limit stop surface, 220, limit section, 221, elastic clamping jaw, 222, first guide inclined plane, 223, second guide inclined plane,

[0034] 300. Punch-in bracket; 310. Connecting plate; 311. Limiting slot; 312. Connecting through hole; 320. Mounting plate; 321. Clearance groove; 330. Wrench; 340. Punch-in blade; 350. First wire guide blade; 351. First wire guide hole; 360. Second wire guide blade; 361. Second wire guide hole;

[0035] 400, Wire-marking cam;

[0036] 500. Fastening screws;

[0037] 600, Shaft screw;

[0038] 700, spool;

[0039] 800, casing;

[0040] 900, the bottom line. Detailed Implementation

[0041] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0042] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0045] Examples, such as Figures 1-8 As shown, a bottom line control mechanism capable of adjusting the wire supply includes:

[0046] Mounting bracket 100, which can be fixedly connected to housing 800.

[0047] A limiting spring plate 200 is located on one side of the mounting bracket 100. One end of the limiting spring plate 200 is detachably and fixedly connected to the mounting bracket 100, and the relative position of the limiting spring plate 200 and the mounting bracket 100 can be adjusted.

[0048] The wire punching frame 300 includes a connecting plate 310 and a mounting plate 320 that are fixedly connected. The connecting plate 310 is located above the limiting spring plate 200 and is rotatably connected to the mounting frame 100. The mounting plate 320 has a relief groove 321 formed on it that cooperates with the wire punching cam 400.

[0049] The connecting plate 310 has a limiting groove 311, and the other end of the limiting spring sheet 200 has an elastic claw 221 that cooperates with the limiting groove 311.

[0050] This invention employs a method of adjusting the relative position of the stitching frame 300 and the stitching cam 400. A limiting spring plate 200 is installed below the stitching frame 300, and the elastic claw 221 of the limiting spring plate 200 is elastically engaged in the limiting slot 311 of the stitching frame 300. In conjunction with the detachable fixed connection between the limiting spring plate 200 and the mounting frame 100, the relative position of the stitching frame 300 and the stitching cam 400 during operation can be changed by altering the relative position of the limiting spring plate 200 and the mounting frame 100. This changes the maximum amount of thread supplied to the bobbin, allowing the sewing machine to provide different amounts of bobbin thread when sewing different fabrics, thereby reducing the occurrence of buckling and thread breakage during sewing.

[0051] Specific embodiment 1, such as Figures 1-6 As shown, a bottom line control mechanism capable of adjusting the wire supply includes:

[0052] A mounting bracket 100 is fixedly connected to the housing 800.

[0053] Specifically, such as Figure 6 As shown, the mounting bracket 100 includes a first plate 130 and a second plate 140 that are vertically fixedly connected. The first plate 130 has a mounting through hole, and a mounting screw is installed in the mounting through hole. The mounting screw fixes the mounting bracket 100 to the housing 800.

[0054] A limiting spring plate 200 is located on one side of the mounting bracket 100. One end of the limiting spring plate 200 is detachably and fixedly connected to the mounting bracket 100, and the relative position of the limiting spring plate 200 and the mounting bracket 100 can be adjusted.

[0055] Specifically, such as Figure 6 As shown, a connecting threaded hole 110 is formed on the second plate 140 of the mounting bracket 100. There are two connecting threaded holes 110, and the two connecting threaded holes 110 are arranged one above the other. An adjusting long slot hole 211 is provided at one end of the limiting spring plate 200. There are two adjusting long slot holes 211, and the two adjusting long slot holes 211 correspond one-to-one with the two connecting threaded holes 110.

[0056] The length of the adjusting long slot 211 is greater than the radial dimension of the connecting threaded hole 110, and the width of the adjusting long slot 211 is greater than the radial dimension of the connecting threaded hole 110. A fastening screw 500 is provided on one side of the limiting spring plate 200. One end of the fastening screw 500 passes through the adjusting long slot 211 and is threaded into the connecting threaded hole 110. The clamping action of the nut end of the fastening screw 500 and the mounting bracket 100 on the limiting spring plate 200 fixes the limiting spring plate 200 to the mounting bracket 100. At the same time, the relative position of the limiting spring plate 200 and the mounting bracket 100 can be adjusted by changing the relative position of the adjusting long slot 211 and the connecting threaded hole 110.

[0057] A punch-down stand 300 includes a connecting plate 310 and a mounting plate 320 fixedly connected. The connecting plate 310 is arranged parallel to one side of the second plate 140 of the mounting bracket 100 and is located above the limiting spring plate 200. A connecting through hole 312 is provided on the connecting plate 310, and a shaft screw 600 is installed in the connecting through hole 312. The end of the shaft screw 600 is fixedly connected to the mounting bracket 100, so that the connecting plate 310 and the mounting bracket 100 can rotate relative to each other, thereby allowing the punch-down stand 300 to switch back and forth between the punch-down position and the threading position.

[0058] A clearance groove 321 is formed on the mounting plate 320 to cooperate with the wire-punching cam 400. The wire-punching cam 400 is located directly below the clearance groove 321 and is mounted on the wire-punching shaft 700. A wire guide plate 340, a first wire guide plate 350, and a second wire guide plate 360 ​​are mounted on the upper surface of the mounting plate 320. The wire guide plate 340 is located in the relief groove 321, and one end of the wire guide plate 340 is fixedly connected to the mounting plate 320 by a mounting screw. The first wire guide plate 350 is located on one side of the wire guide plate 340 and is fixedly connected to the mounting plate 320 by a mounting screw. A first wire guide hole 351 is formed on the first wire guide plate 350. The second wire guide plate 360 ​​is located on the other side of the wire guide plate 340 and is fixedly connected to the mounting plate 320 by a mounting screw. A second wire guide hole 361 is formed on the second wire guide plate 360. The bottom wire 900 passes through the first wire guide hole 351 and the second wire guide hole 361.

[0059] A limiting groove 311 is formed on the connecting plate 310. An elastic claw 221 that cooperates with the limiting groove 311 is formed at the other end of the limiting spring plate 200. The elastic claw 221 is engaged in the limiting groove 311, and the elastic claw 221 can elastically deform in the groove depth direction of the limiting groove 311 so that the elastic claw 221 can enter and exit the limiting groove 311.

[0060] This is because the length and width of the adjustable long slot 211 are both greater than the radial dimension of the connecting threaded hole 110. By changing the relative position of the adjustable long slot 211 and the connecting threaded hole 110, the relative position of the limiting spring plate 200 and the mounting bracket 100 can be adjusted. This allows the elastic claw 221 at the other end of the limiting spring plate 200 to engage in the limiting slot 311 on the connecting plate 310, thereby enabling the punching frame 300 to rotate around the shaft screw 600 to different positions and be fixed, thus achieving the adjustment of the relative position of the punching frame 300 and the punching cam 400.

[0061] Preferred, such as Figure 3 As shown, the limiting groove 311 is formed on the connecting plate 310 along the radial direction of the connecting through hole 312.

[0062] More preferably, such as Figure 3 As shown, the punch-down stand 300 also includes a wrench 330. The connecting plate 310 is located on one side of the mounting plate 320, and the wrench 330 is located on the other side of the mounting plate 320, so that the operator can rotate the punch-down stand 300 upward.

[0063] Specific embodiment 2, such as Figures 1-5 and Figure 7 As shown, a bottom line control mechanism capable of adjusting the wire supply includes:

[0064] A mounting bracket 100 is fixedly connected to the housing 800.

[0065] A limiting spring plate 200 is located on one side of the mounting bracket 100. The bottom end of the limiting spring plate 200 is detachably and fixedly connected to the mounting bracket 100, and the relative position of the limiting spring plate 200 and the mounting bracket 100 can be adjusted.

[0066] Preferred, such as Figure 4 and Figure 5 As shown, the limiting spring plate 200 includes a connecting section 210 and a limiting section 220. Two adjusting long slots 211 are formed on the connecting section 210. A first long slot 120 is formed on the mounting bracket 100. The length direction of the first long slot 120 is perpendicular to the length direction of the adjusting long slot 211. A fastening bolt (not shown in the figure) is provided on one side of the limiting spring plate 200. One end of the fastening bolt passes sequentially through the adjusting long slot 211 and the first long slot 120 and is fixedly connected to a fastening nut, thereby fixing the limiting spring plate 200 to the mounting bracket 100. Simultaneously, the relative position of the limiting spring plate 200 and the mounting bracket 100 can be adjusted by changing the relative position of the adjusting long slot 211 and the first long slot 120.

[0067] A punch-down stand 300 includes a connecting plate 310 and a mounting plate 320 fixedly connected. The connecting plate 310 is arranged parallel to one side of the mounting frame 100 and is located above the limiting spring plate 200. A connecting through hole 312 is provided on the connecting plate 310, and a shaft screw 600 is installed in the connecting through hole 312. The end of the shaft screw 600 is fixedly connected to the mounting frame 100, so that the connecting plate 310 and the mounting frame 100 can rotate relative to each other, thereby allowing the punch-down stand 300 to switch back and forth between the punch-down position and the threading position.

[0068] A limiting groove 311 is provided on the connecting plate 310, and an elastic claw 221 that cooperates with the limiting groove 311 is formed on the top of the limiting spring plate 200, and the elastic claw 221 is engaged with the limiting groove 311.

[0069] Specifically, such as Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the bottom end of the limiting segment 220 is fixedly connected to the top end of the connecting segment 210, and the top end of the limiting segment 220 is formed with an elastic claw 221 protruding towards the mounting bracket 100. A first guide slope 222 is formed on the side of the elastic claw 221 away from the connecting segment 210 to allow the elastic claw 221 to enter the limiting slot 311. This allows the connecting plate 310 to press the elastic claw 221 outward under the guidance of the first guide slope 222 when the punch-down bracket 300 rotates downward around the shaft screw 600. This causes the elastic claw 221 to undergo elastic deformation and smoothly engage in the limiting slot 311. A second guide slope 223 is formed on the side of the elastic claw 221 near the connecting section 210 to allow the elastic claw 221 to disengage from the limiting slot 311. When the wire bonding frame 300 rotates upward around the shaft screw 600, the connecting plate 310 can press the elastic claw 221 outward under the guidance of the second guide slope 223, thereby causing the elastic claw 221 to undergo elastic deformation and smoothly disengage from the limiting slot 311.

[0070] Preferably, a limiting stop surface 212 is formed at one end of the connecting section 210 near the limiting section 220 to form a stop with the connecting plate 310. When the punch-down bracket 300 rotates downward around the shaft screw 600 and the elastic claw 221 is engaged in the limiting slot 311, the limiting stop surface 212 can abut against the surface of the connecting plate 310, thereby preventing the punch-down bracket 300 from continuing to rotate and realizing the fixed connection between the punch-down bracket 300 and the mounting bracket 100.

[0071] A clearance groove 321 is formed on the mounting plate 320 to cooperate with the wire-punching cam 400. The wire-punching cam 400 is located directly below the clearance groove 321 and is mounted on the wire-punching shaft 700. A wire guide plate 340, a first wire guide plate 350, and a second wire guide plate 360 ​​are installed above the mounting plate 320. The wire guide plate 340 is located in the relief groove 321, and one end of the wire guide plate 340 is fixedly connected to the mounting plate 320 by a mounting screw. The first wire guide plate 350 is located on one side of the wire guide plate 340 and is fixedly connected to the mounting plate 320 by a mounting screw. A first wire guide hole 351 is formed on the first wire guide plate 350. The second wire guide plate 360 ​​is located on the other side of the wire guide plate 340 and is fixedly connected to the mounting plate 320 by a mounting screw. A second wire guide hole 361 is formed on the second wire guide plate 360, and the bottom wire 900 passes through the first wire guide hole 351 and the second wire guide hole 361.

[0072] Examples, such as Figure 8 As shown, a sewing machine includes the aforementioned bottom thread control mechanism capable of adjusting the thread supply.

[0073] The working process of the bottom line control mechanism of this utility model is as follows:

[0074] When the bobbin thread 900 passes through the thread guide groove on the thread guide plate 340 via the second thread guide hole 361 on the second thread guide plate 360 ​​and exits through the first thread guide hole 351 on the first thread guide plate 350 and is subjected to a certain preload, the bobbin thread required for sewing can be provided by the rotation of the thread guide cam 400. However, the relative position of the thread guide frame 300 and the thread guide cam 400 in existing sewing machines is fixed. Therefore, the distance between the second thread guide hole 361 of the second thread guide plate 360 ​​and the first thread guide hole 351 of the first thread guide plate 350 relative to the center of the thread guide cam 400 is fixed. In other words, the existing bobbin thread control mechanism can only provide a fixed amount of thread.

[0075] like Figure 2 As shown, the relative position of the adjusting slot 211 on the limiting spring plate 200 and the connecting threaded hole 110 on the mounting bracket 100 can be adjusted. By fixing the limiting spring plate 200 at different positions on the mounting bracket 100 and engaging the elastic claw 221 of the limiting spring plate 200 into the limiting slot 311 of the wire bonding frame, the wire bonding frame 300, which has been rotated to different positions relative to the mounting bracket 100, is fixedly connected to the mounting bracket 100. This causes the distance between the first wire passing hole 351 of the first wire passing plate 350 and the second wire passing hole 361 of the second wire passing plate 360 ​​on the wire bonding frame 300 and the wire bonding cam 400 at the wire bonding position to increase or decrease, thereby changing the amount of wire supplied by the wire bonding cam 400 during operation.

[0076] For example, when sewing thin fabrics, if insufficient thread supply causes arching, the height of the limiting spring plate 200 can be lowered, thereby limiting the stitching frame 300 to a lower position. This increases the distance between the first thread guide hole 351 of the first thread guide plate 350 and the second thread guide hole 361 of the second thread guide plate 360 ​​on the stitching frame 300 and the stitching cam 400 at the stitching moment, thereby increasing the amount of thread stitched and solving the arching problem.

[0077] When sewing thick materials, if insufficient thread supply causes thread breakage, the height of the limiting spring plate 200 can be lowered to limit the thread-feeding frame 300 to a lower position. This increases the distance between the first thread-feeding hole 351 of the first thread-feeding plate 350 and the second thread-feeding hole 361 of the second thread-feeding plate 360 ​​on the thread-feeding frame 300 and the position of the thread-feeding cam 400 at the time of thread feeding, thereby increasing the amount of thread fed and solving the thread breakage problem caused by insufficient thread.

[0078] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0079] This invention utilizes an adjustable limiting spring plate to limit the thread-feeding frame to different positions, so that the thread-passing hole on the thread-feeding frame is at different distances relative to the thread-feeding position of the thread-feeding cam. This not only realizes the adjustment of the maximum thread supply of the bobbin, but also has the advantages of simple structure and convenient operation. It can significantly improve the shortcomings of the limited bobbin adjustment range of existing sewing machines, so that the thread does not arch or break during sewing, and reduces the skipped stitch rate.

[0080] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A baseline control mechanism capable of adjusting the wire supply, characterized in that, include: Mounting bracket (100) that can be fixedly connected to housing (800); A limiting spring plate (200) is located on one side of the mounting bracket (100). One end of the limiting spring plate (200) is detachably and fixedly connected to the mounting bracket (100), and the relative position of the limiting spring plate (200) and the mounting bracket (100) can be adjusted. A punching frame (300) includes a connecting plate (310) and a mounting plate (320) that are fixedly connected. The connecting plate (310) is located above the limiting spring plate (200) and is rotatably connected to the mounting frame (100). The mounting plate (320) has a relief groove (321) formed on it to cooperate with the punching cam (400). The connecting plate (310) has a limiting slot (311) and the other end of the limiting spring sheet (200) is formed with an elastic claw (221) that cooperates with the limiting slot (311).

2. The baseline control mechanism for adjusting the wire supply according to claim 1, characterized in that, The mounting bracket (100) has a connecting threaded hole (110) formed on it. One end of the limiting spring plate (200) has an adjusting long slot (211). The length and width of the adjusting long slot (211) are both greater than the radial dimension of the connecting threaded hole (110). A fastening screw (500) is provided on one side of the limiting spring plate (200). One end of the fastening screw (500) passes through the adjusting long slot (211) and is threaded into the connecting threaded hole (110).

3. A baseline control mechanism capable of adjusting the wire supply according to claim 2, characterized in that, The number of the connecting threaded holes (110) is two, and the adjusting long slot hole (211) and the connecting threaded hole (110) are in a one-to-one correspondence.

4. A baseline control mechanism capable of adjusting the wire supply according to claim 1, characterized in that, The mounting bracket (100) has a first long slot (120) formed on it. One end of the limiting spring plate (200) has an adjusting long slot (211). The length direction of the first long slot (120) is perpendicular to the length direction of the adjusting long slot (211). A fastening bolt is provided on one side of the limiting spring plate (200). One end of the fastening bolt passes through the adjusting long slot (211) and the first long slot (120) in sequence and is fixedly connected to the fastening nut.

5. A baseline control mechanism capable of adjusting the wire supply according to claim 4, characterized in that, The number of the adjusting long slots (211) is two.

6. A baseline control mechanism capable of adjusting the wire supply according to claim 1, characterized in that, The connecting plate (310) has a connecting through hole (312), and a shaft screw (600) is inserted in the connecting through hole (312) to allow the connecting plate (310) and the mounting bracket (100) to rotate relative to each other. The limiting groove (311) is arranged along the radial direction of the connecting through hole (312).

7. A baseline control mechanism capable of adjusting the wire supply according to claim 6, characterized in that, The limiting spring sheet (200) includes a connecting section (210) and a limiting section (220). The connecting section (210) is detachably and fixedly connected to the mounting bracket (100). One end of the limiting section (220) is fixedly connected to one end of the connecting section (210). The other end of the limiting section (220) is formed with an elastic claw (221) protruding toward the connecting plate (310).

8. A baseline control mechanism capable of adjusting the wire supply according to claim 7, characterized in that, The elastic claw (221) has a first guide slope (222) formed on the side away from the connecting section (210) for allowing the elastic claw (221) to enter the limiting groove (311), and a second guide slope (223) formed on the side of the elastic claw (221) close to the connecting section (210) for allowing the elastic claw (221) to disengage from the limiting groove (311).

9. A baseline control mechanism capable of adjusting the wire supply according to claim 8, characterized in that, The connecting section (210) near the limiting section (220) has a limiting stop surface (212) that cooperates with the connecting plate (310) to form a stop.

10. A baseline control mechanism capable of adjusting the wire supply according to claim 1, characterized in that, The punch-down holder (300) also includes a wrench (330), the connecting plate (310) is located on one side of the mounting plate (320), and the wrench (330) is located on the other side of the mounting plate (320).

11. A sewing machine, characterized in that, The bottom line control mechanism capable of adjusting the wire supply as described in any one of claims 1-10.

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