Thread trimming mechanism of sewing machine and sewing machine

Abstract

The utility model discloses a thread trimming mechanism of a sewing machine and the sewing machine. The thread trimming mechanism comprises a fixed cutter holder, and the fixed cutter holder is provided with a rotating shuttle table; the movable tool apron is rotatably connected to the rotating shuttle table in a penetrating mode and provided with a movable tool, the connecting base is provided with a limiting mechanism used for conducting anti-loosening protection on the mounting bolt, the limiting mechanism comprises a limiting plate, the limiting plate is slidably connected to the end of the mounting bolt in a penetrating mode and used for locking the mounting position of the mounting bolt, and a connecting frame is arranged on the connecting base. The connecting frame is located on the side of the limiting plate. And an anti-falling plate. Through mutual cooperation of the mounting bolt, the limiting plate, the connecting frame, the anti-falling plate, the sliding plate and the spring, the limiting plate performs anti-rotation protection on the mounting bolt, the pushing plate drives the sliding plate and the anti-falling plate to move, and the anti-falling plate limits the relative position of the connecting frame and the limiting plate; limiting protection on the movable cutter mounting bolt is facilitated, and the situation that the movable cutter mounting bolt is loosened due to autorotation is conveniently prevented.

Description

Technical Field

[0001] This utility model relates to the field of sewing machines, and in particular to a thread-cutting mechanism for a sewing machine and a sewing machine. Background Technology

[0002] A sewing machine is a commonly used sewing device with a wide range of applications. Sewing machines are usually equipped with a thread-cutting mechanism to cut the sewing thread.

[0003] Application No. 202321909854.2 discloses a thread-cutting mechanism for a sewing machine. The sewing machine includes a rotary hook table, and the thread-cutting mechanism includes a fixed blade seat on the rotary hook table, a fixed blade on the fixed blade seat, a movable blade rotatably mounted on the rotary hook table, and a thread clamping assembly on the fixed blade seat for clamping the bobbin thread. The thread clamping assembly includes a clamping plate on the fixed blade seat and a clamping part with one end mounted on the clamping plate. The clamping part is elastic. The movable blade includes a movable blade body and a first hook part on the movable blade body for hooking the bobbin thread. When the movable blade and the fixed blade cooperate to cut the thread, the clamping part undergoes elastic deformation, and the other end of the clamping part abuts against the first hook part, and the bobbin thread is clamped between the clamping part and the first hook part.

[0004] The process involves using a rotating moving blade to approach a fixed blade to cut the sewing thread. The moving blade is usually fixed to the cube with multiple bolts. However, the moving blade usually rotates multiple times, and after prolonged use, the bolts may loosen, affecting the stability of the moving blade. Consequently, the sewing machine's thread cutting mechanism cannot easily limit and protect the moving blade bolts, which presents certain limitations. Utility Model Content

[0005] The purpose of this invention is to provide a thread-cutting mechanism for a sewing machine and a sewing machine in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a thread-cutting mechanism for a sewing machine, comprising:

[0007] A fixed tool holder, on the back of which a rotary table is mounted;

[0008] A movable blade holder is rotatably connected to a rotary shuttle table. A movable blade is provided on the side of the movable blade holder. A connecting seat is fixedly connected to the side of the movable blade. A fixed blade is provided at the end of the movable blade.

[0009] The connecting seat has a threaded mounting bolt on its side, and a limiting mechanism is provided on the side of the connecting seat to prevent the mounting bolt from loosening. The limiting mechanism includes:

[0010] A limiting plate is slidably inserted into the end of the mounting bolt, and the limiting plate is used to lock the installation position of the mounting bolt;

[0011] A connecting frame, the connecting frame being located on the side of the limiting plate;

[0012] An anti-detachment plate is slidably inserted into the inner cavity of the connecting frame, and the end of the anti-detachment plate is slidably disposed on a limiting plate.

[0013] Preferably, the side of the connecting frame is fixedly connected to the connecting seat, the side of the limiting plate is symmetrically provided with mounting grooves, and the anti-detachment plate is slidably inserted into the inner cavity of the mounting groove.

[0014] Preferably, a sliding plate is fixedly connected to the side of the anti-detachment plate, and a first through groove is provided on the side of the connecting frame, wherein the sliding plate is slidably inserted into the inner cavity of the first through groove.

[0015] Preferably, an auxiliary plate is fixedly connected to the inner wall of the connecting frame, and a second through groove is provided on the side of the auxiliary plate. A fixing rod is fixedly inserted into the inner cavity of the second through groove, and the outer wall of the fixing rod is slidably inserted into the top of the connecting frame.

[0016] Preferably, a push plate is fixedly connected to the side of the sliding plate, and a drive plate is fixedly connected to the other side of the anti-detachment plate. The drive plate has a circular groove on its side that cooperates with the fixed rod.

[0017] Preferably, the outer wall of the fixing rod is fitted with a spring for driving the drive plate to slide along the outside of the fixing rod, one end of the spring is fixedly connected to the drive plate, and the other end of the spring is fixedly connected to the side of the inner wall of the connecting frame.

[0018] Another objective of this invention is to provide a sewing machine that includes the aforementioned thread-cutting mechanism.

[0019] The technical effects and advantages of this utility model are as follows:

[0020] This utility model utilizes the cooperation of mounting bolts, limiting plates, connecting frames, anti-detachment plates, sliding plates, pushing plates, driving plates, and springs. The mounting bolts lock and fix the connecting seat and the moving tool seat, the limiting plates protect the mounting bolts from rotation, the pushing plates drive the sliding plates and anti-detachment plates to move, and the anti-detachment plates limit the relative position of the connecting frame and the limiting plates. This helps to limit and protect the moving tool mounting bolts, preventing them from rotating and loosening, thus increasing the stability of the moving tool in use. Attached Figure Description

[0021] Figure 1 This is a front structural diagram of the present utility model.

[0022] Figure 2 This is a front sectional view of the connecting frame of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the limiting plate of this utility model.

[0024] In the diagram: 1. Fixed blade holder; 2. Rotary shuttle table; 3. Moving blade holder; 4. Moving blade; 5. Connecting seat; 6. Limiting mechanism; 61. Limiting plate; 62. Connecting frame; 63. Anti-detachment plate; 64. Sliding plate; 65. Push plate; 66. Auxiliary plate; 67. Drive plate; 68. Fixing rod; 69. Spring; 7. Mounting bolt; 8. Fixed blade. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides, for example Figure 1-3 The thread-cutting mechanism of a sewing machine shown includes a fixed blade holder 1 and a movable blade holder 3. A rotary hook table 2 is mounted on the back of the fixed blade holder 1. The movable blade holder 3 is rotatably connected to the rotary hook table 2. A movable blade 4 is provided on the side of the movable blade holder 3, which facilitates proximity to the fixed blade 8, so that the sewing thread between the movable blade 4 and the fixed blade 8 is cut. A connecting seat 5 is fixedly connected to the side of the movable blade 4, which facilitates the support of the movable blade 4 and the installation of the movable blade 4. A fixed blade 8 is provided at the end of the movable blade 4.

[0027] Furthermore, the connecting seat 5 is threadedly connected to a mounting bolt 7 on its side. The mounting bolt 7 facilitates the connection and fixation of the connecting seat 5 and the moving tool seat 3 for the installation of the moving tool 4. The end of the mounting bolt 7 has a groove that mates with the limiting plate 61. The connecting seat 5 is provided with a limiting mechanism 6 on its side to prevent the mounting bolt 7 from loosening. The limiting mechanism 6 includes a limiting plate 61, a connecting frame 62, and an anti-loosening plate 63. The limiting plate 61 helps to limit the position of the mounting bolt 7, thereby preventing the mounting bolt 7 from rotating arbitrarily and increasing the stability of the moving tool 4. The connecting frame 62 helps to support the anti-loosening plate 63. The sliding support facilitates the storage and concealment of the anti-detachment plate 63. The anti-detachment plate 63 helps to limit the relative position of the connecting frame 62 and the limiting plate 61, preventing the limiting plate 61 from sliding arbitrarily. The limiting plate 61 is slidably inserted into the end of the mounting bolt 7 and is used to lock the installation position of the mounting bolt 7. The connecting frame 62 is located on the side of the limiting plate 61. The anti-detachment plate 63 is slidably inserted into the inner cavity of the connecting frame 62. The end of the anti-detachment plate 63 is slidably set on the limiting plate 61. The side of the connecting frame 62 is fixedly connected to the connecting seat 5. The side of the limiting plate 61 has symmetrically opened mounting grooves, and the anti-detachment plate 63 is slidably inserted into the inner cavity of the mounting groove.

[0028] Specifically, a sliding plate 64 is fixedly connected to the side of the anti-detachment plate 63, which facilitates the movement of the anti-detachment plate 63 and makes it easier for the anti-detachment plate 63 to disengage from the limiting plate 61. A first through groove is opened on the side of the connecting frame 62, and the sliding plate 64 is slidably inserted into the inner cavity of the first through groove. An auxiliary plate 66 is fixedly connected to the inner wall of the connecting frame 62, which facilitates the fixed support of the fixing rod 68 to increase the stability of the fixing rod 68 and also facilitates the compression of the spring 69. A second through groove is opened on the side of the auxiliary plate 66, and the fixing rod 68 is fixedly inserted into the inner cavity of the second through groove, which facilitates the sliding of the drive plate 67 and also facilitates the deformation of the spring 69. The outer wall of the fixing rod 68 is slidably inserted into the top of the connecting frame 62. The sliding plate 64... A push plate 65 is fixedly connected to the side, which facilitates the movement of the sliding plate 64 and the driving operation of the sliding plate 64. A drive plate 67 is fixedly connected to the other side of the anti-detachment plate 63, which facilitates the sliding of the anti-detachment plate 63 and the traction operation of the anti-detachment plate 63. A circular groove that mates with the fixed rod 68 is opened on the side of the drive plate 67. A spring 69 is sleeved on the outer wall of the fixed rod 68 to drive the drive plate 67 to slide along the outside of the fixed rod 68. The elastic force of the spring 69 facilitates the horizontal sliding of the drive plate 67, so that the drive plate 67 and the anti-detachment plate 63 return to their original positions after movement, which facilitates the repeated operation of the anti-detachment plate 63. One end of the spring 69 is fixedly connected to the drive plate 67, and the other end of the spring 69 is fixedly connected to the side of the inner wall of the connecting frame 62.

[0029] This embodiment provides a sewing machine, which includes the thread-cutting mechanism described above.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thread trimming mechanism of a sewing machine, comprising: a fixed knife seat (1), a rotating hook platform (2) being mounted on the back of the fixed knife seat (1); a movable knife seat (3), the movable knife seat (3) being rotatably connected to the rotating hook platform (2), a movable knife (4) being arranged on the side of the movable knife seat (3), a connecting seat (5) being fixedly connected to the side of the movable knife (4), a fixed knife (8) being arranged on the end of the movable knife (4); characterized in that a mounting bolt (7) is threadedly connected to the side of the connecting seat (5), a limiting mechanism (6) for preventing the mounting bolt (7) from loosening is arranged on the side of the connecting seat (5), the limiting mechanism (6) comprising: a limiting plate (61), the limiting plate (61) being slidably connected to the end of the mounting bolt (7), the limiting plate (61) being used for locking the mounting position of the mounting bolt (7); a connecting frame (62), the connecting frame (62) being arranged on the side of the limiting plate (61); an anti-dropping plate (63), the anti-dropping plate (63) being slidably connected to the inner cavity of the connecting frame (62), the end of the anti-dropping plate (63) being slidably arranged on the limiting plate (61).

2. The thread trimming mechanism of a sewing machine according to claim 1, wherein The side of the connecting frame (62) is fixedly connected to the connecting seat (5), the side of the limiting plate (61) is symmetrically provided with a mounting groove, and the inner cavity of the anti-dropping plate (63) is slidably connected to the mounting groove.

3. The thread trimming mechanism of claim 1 wherein, The side of the anti-dropping plate (63) is fixedly connected with a sliding plate (64), the side of the connecting frame (62) is provided with a first through groove, and the inner cavity of the first through groove is slidably connected with the sliding plate (64).

4. The thread trimming mechanism of claim 1 wherein, The inner wall of the connecting frame (62) is fixedly connected with an auxiliary plate (66), the side of the auxiliary plate (66) is provided with a second through groove, the inner cavity of the second through groove is fixedly connected with a fixed rod (68), and the outer wall of the fixed rod (68) is slidably connected with the top of the connecting frame (62).

5. The thread trimming mechanism of claim 3 wherein, The side of the sliding plate (64) is fixedly connected with a pushing plate (65), the other side of the anti-dropping plate (63) is fixedly connected with a driving plate (67), and the side of the driving plate (67) is provided with a circular groove matched with the fixed rod (68).

6. The thread trimming mechanism of claim 4 wherein, The outer wall of the fixed rod (68) is sleeved with a spring (69) for driving the driving plate (67) to slide along the outer part of the fixed rod (68), one end of the spring (69) is fixedly connected with the driving plate (67), and the other end of the spring (69) is fixedly connected with the side of the inner wall of the connecting frame (62).

7. A sewing machine characterized by comprising: The sewing machine comprises the thread trimming mechanism according to any one of claims 1-6.

Images