Thread cutting mechanism of sewing machine

Abstract

The utility model belongs to the technical field of sewing equipment, and particularly relates to a thread cutting mechanism of a sewing machine, which comprises a rotating shuttle table, an axe shaft and a thread cutting mechanism, the rotating shuttle is arranged at the top end of the axe shaft; the needle plate is arranged on one side of the rotating shuttle, and a needle hole is formed in the needle plate; the ox horn part is arranged on the rotating shuttle table and located on one side of the rotating shuttle; the movable cutter part is arranged on the rotating shuttle table, and the movable cutter part comprises a movable cutter head located below the needle plate; the fixed cutter part is arranged on the rotating shuttle table, and the fixed cutter part comprises a fixed cutter head located below the needle plate; wherein the thread cutting position formed by mutual matching of the movable tool bit and the fixed tool bit is located below the needle hole, the movable tool bit can move in a reciprocating mode for thread cutting, and compared with the prior art, the thread cutting device effectively reduces the length of a thread cutting head and improves the thread cutting effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing equipment, and particularly relates to a thread cutting mechanism of a sewing machine. Background Art

[0002] The thread cutting or trimming structure of a sewing machine is an important part in the design of a sewing machine, which involves the handling of thread ends and the function of maintaining sewing quality. For example, an automatic sewing machine thread cutting mechanism and a sewing machine disclosed in the patent with the application number CN201810690662.4, wherein the thread cutting mechanism includes a fixed knife seat, a fixed knife, a moving knife seat, and a moving knife. The moving knife rotates around its support point on the moving knife seat to approach or move away from the needle hole. There is a thread hooking part on the moving knife for hooking the sewing thread passing through the needle hole. The cutting edge of the moving knife is close to the thread hooking part. A positioning boss protruding from the bottom surface of the moving knife is processed at the bottom end of the moving knife away from the moving knife seat. Correspondingly, a limiting convex block is processed on one side of the top of the fixed knife seat. A limiting space for the projection of the rotary hook shuttle case is formed between the positioning boss and the limiting convex block when the moving knife rotates to the maximum position close to the needle hole; the cutting edge of the fixed knife adapted to cooperate with the cutting edge of the moving knife is moved to a position close to the needle hole;

[0003] During the use of this existing sewing machine, the thread cutting position formed by the moving knife and the fixed knife in the thread cutting mechanism is located on the side of the needle hole, and there is still a certain distance between the thread cutting position and the needle hole on the needle plate. This results in a relatively long thread end generated by thread cutting, which not only affects the sewing quality, but also reduces the aesthetic effect, and is also likely to affect the subsequent processing. Therefore, it is necessary to make improvements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a thread cutting mechanism of a sewing machine for the above-mentioned existing technical problems, so as to further improve the thread cutting effect of the thread cutting mechanism.

[0005] In view of this, the utility model provides a thread cutting mechanism of a sewing machine, including:

[0006] A rotary hook base, on which an axe shaft is arranged;

[0007] A rotary hook, which is arranged at the top end of the axe shaft;

[0008] A needle plate, which is arranged on one side of the rotary hook, and a needle hole is arranged on the needle plate;

[0009] A horn part, which is arranged on the rotary hook base and on one side of the rotary hook;

[0010] It further includes:

[0011] A moving knife part, which is arranged on the rotary hook base, and the moving knife part includes a moving knife head located below the needle plate;

[0012] The fixed knife part is arranged on the rotary hook table. The fixed knife part includes a fixed knife head located below the needle plate;

[0013] Wherein, the tangent formed by the cooperation of the moving knife head and the fixed knife head is located below the needle hole, and the moving knife head can reciprocate to cut the thread.

[0014] In this technical solution, during the working process of the sewing machine, by modifying the moving knife part and the fixed knife part, the tangent formed by the moving knife head and the fixed knife head is located below the needle hole, thus effectively shortening the distance between the tangent and the needle hole. The thread end formed after the tangent mechanism cuts the thread is short, effectively improving the tangent effect, preventing the sewing quality from being affected, improving the aesthetic degree, and not affecting the subsequent processing.

[0015] In the above technical solution, further, the moving knife part further includes:

[0016] A moving knife seat is arranged on the rotary hook table, and a gear installation groove is arranged in the moving knife seat;

[0017] A driving half gear is movably arranged in the gear installation groove;

[0018] A main driving gear is arranged on the axe shaft;

[0019] A moving knife body is movably arranged on the moving knife seat;

[0020] Wherein, the main driving gear can reciprocally rotate driven by the axe shaft, the moving knife body is in transmission connection with the driving half gear and can reciprocally move driven by the driving half gear, the driving half gear meshes with the main driving gear, and the moving knife head is arranged on the moving knife body.

[0021] In the above technical solution, further, the moving knife body further includes:

[0022] A knife body connecting seat is in transmission connection with the driving half gear through a transmission shaft;

[0023] A moving knife extension arm is arranged on the knife body connecting seat and extends horizontally to below the needle plate;

[0024] A support arm is arranged at one end of the extension arm away from the knife body connecting seat, and the support arm extends upward to below the needle hole;

[0025] Wherein, the moving knife head is arranged at the top end of the support arm.

[0026] In the above technical solution, further, the fixed knife part further includes:

[0027] A fixed knife base is arranged on the rotary hook table;

[0028] The fixed knife support seat is arranged on the fixed knife base and extends upward to the needle plate;

[0029] The fixed knife body is arranged at the top of the fixed knife support seat.

[0030] In the above technical solution, further, the fixed knife body further includes:

[0031] The fixed knife mounting arm is arranged at the top of the fixed knife support seat;

[0032] The fixed knife extension arm is arranged at the top of the fixed knife mounting arm, and the fixed knife extension arm extends horizontally to the lower side of the needle hole;

[0033] Wherein, the fixed knife head is arranged at one end of the fixed knife extension arm far away from the fixed knife mounting arm.

[0034] In the above technical solution, further, the horn part further includes:

[0035] The horn base is arranged on the rotary hook table;

[0036] The horn support seat is arranged on the horn base and extends upward. A slot for cooperating with the reciprocating movement of the moving knife body is arranged on the horn support seat;

[0037] The horn main body is arranged on the horn support seat and is located on one side of the rotary hook.

[0038] The beneficial effects of the present utility model are:

[0039] 1. By modifying the moving knife part and the fixed knife part, the tangent line formed by the moving knife head and the fixed knife head is located below the needle hole, thereby effectively shortening the distance between the tangent line and the needle hole. The thread end formed after the tangent mechanism cuts the thread is short, effectively improving the tangent effect, preventing the sewing quality from being affected, improving the aesthetic degree, and not affecting the subsequent processing;

[0040] 2. Through the setting of the main drive gear and the drive half gear, compared with the traditional moving knife drive mode, the moving knife body in the present utility model is driven by the axe shaft, and the moving stability of the moving knife is high, and the noise generated by the movement of the moving knife is small;

[0041] 3. Through the setting of the horn part, the horn support seat is provided with a slot that can effectively cooperate with the movement of the moving knife body, reducing the phenomenon of collision between the moving knife body and the horn main body during the movement of the moving knife body, ensuring the stable progress of the tangent operation. Description of the Drawings

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 Structural schematic diagram of the specific embodiment of the present invention.

[0044] Figure 2 Structural schematic diagram of the moving knife part of the present invention.

[0045] Figure 3 Structural schematic diagram of the moving knife body of the present invention.

[0046] Figure 4 Structural schematic diagram of the fixed knife part of the present invention.

[0047] Figure 5 Structural schematic diagram of the driving half gear of the present invention.

[0048] The markings in the figure are shown as:

[0049] 1. Rotating shuttle base; 2. Axe shaft; 3. Rotating shuttle; 4. Needle plate; 5. Needle hole; 6. Horn part; 60. Horn base; 61. Horn support seat; 62. Groove; 63. Horn body; 7. Moving knife part; 70. Moving knife head; 71. Moving knife seat; 72. Gear installation groove; 73. Driving half gear; 74. Main driving gear; 75. Moving knife body; 750. Knife body connecting seat; 751. Transmission shaft; 752. Moving knife extension arm; 753. Support arm; 8. Fixed knife part; 80. Fixed knife head; 81. Fixed knife base; 82. Fixed knife support seat; 83. Fixed knife body; 830. Fixed knife installation arm; 831. Fixed knife extension arm; 9. Tangent point. Specific embodiments

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0051] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present application. For the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0052] Embodiment 1:

[0053] The present embodiment of the application provides a thread cutting mechanism for a sewing machine, including: a rotating hook base 1, on which an axe shaft 2 is provided; a rotating hook 3, which is arranged at the top of the axe shaft 2; a needle plate 4, which is arranged on one side of the rotating hook 3, and a needle hole 5 is provided on the needle plate 4; a horn part 6, which is arranged on the rotating hook base 1 and on one side of the rotating hook 3;

[0054] It further includes: a moving knife part 7, which is arranged on the rotating hook base 1, and the moving knife part 7 includes a moving knife head 70 located below the needle plate 4; a fixed knife part 8, which is arranged on the rotating hook base 1, and the fixed knife part 8 includes a fixed knife head 80 located below the needle plate 4;

[0055] Wherein, a thread cutting position 9 formed by the cooperation of the moving knife head 70 and the fixed knife head 80 is located below the needle hole 5, and the moving knife head 70 can reciprocate to cut the thread.

[0056] In this embodiment, during the working process of the sewing machine, by modifying the moving knife part 7 and the fixed knife part 8, the thread cutting position 9 formed by the moving knife head 70 and the fixed knife head 80 is located below the needle hole 5, thereby effectively shortening the distance between the thread cutting position 9 and the needle hole 5. The thread end formed after the thread cutting mechanism cuts the thread is short, effectively improving the thread cutting effect, preventing the sewing quality from being affected, improving the aesthetic degree, and not affecting the subsequent processing.

[0057] Embodiment 2:

[0058] This embodiment provides a thread cutting mechanism for a sewing machine. In addition to the technical solutions of the above embodiments, it also has the following technical features. The moving knife part 7 further includes: a moving knife seat 71, which is arranged on the rotating shuttle base 1, and a gear mounting groove 72 is arranged in the moving knife seat 71; a driving half gear 73, which is movably arranged in the gear mounting groove 72; a main driving gear 74, which is arranged on the axe shaft 2; a moving knife blade body 75, which is movably arranged on the moving knife seat 71.

[0059] Wherein, the main driving gear 74 can reciprocally rotate driven by the axe shaft 2, the moving knife blade body 75 is in transmission connection with the driving half gear 73 and can reciprocally move driven by the driving half gear 73, the driving half gear 73 meshes with the main driving gear 74, and the moving knife head 70 is arranged on the moving knife blade body 75.

[0060] The moving knife blade body 75 further includes: a blade body connecting seat 750, which is in transmission connection with the driving half gear 73 through a transmission shaft 751; a moving knife extension arm 752, which is arranged on the blade body connecting seat 750 and extends horizontally below the needle plate 4; a support arm 753, which is arranged at one end of the extension arm away from the blade body connecting seat 750, and the support arm 753 extends upward below the needle hole 5.

[0061] Wherein, the moving knife head 70 is arranged at the top end of the support arm 753.

[0062] The fixed knife part 8 further includes: a fixed knife base 81, which is arranged on the rotating shuttle base 1; a fixed knife support seat 82, which is arranged on the fixed knife base 81 and extends upward to the needle plate 4; a fixed knife body 83, which is arranged at the top end of the fixed knife support seat 82.

[0063] The fixed knife body 83 further includes: a fixed knife mounting arm 830, which is arranged at the top end of the fixed knife support seat 82; a fixed knife extension arm 831, which is arranged at the top end of the fixed knife mounting arm 830, and the fixed knife extension arm 831 extends horizontally below the needle hole 5.

[0064] Wherein, the fixed knife head 80 is arranged at one end of the fixed knife extension arm 831 away from the fixed knife mounting arm 830.

[0065] Moreover, the axe shaft 2 is a conventional axe shaft 2 of the rotating shuttle 3, also called a kettle shaft, which has a bobbin shaft connected to the main body of the rotating shuttle 3 and an outer shaft or shaft sleeve located outside the bobbin shaft. The outer shaft or shaft sleeve can be in transmission connection with the sewing machine transmission mechanism through a conventional reciprocating transmission connection method.

[0066] Moreover, the extension path of the extension arm can be changed according to the installation position and specific structure of each component on the rotary shuttle platform 1. For example, the middle section of the extension arm has a curved section that cooperates with the surface of the axe shaft 2 to facilitate the extension arm to bypass the axe shaft 2 during the extension process. The movable cutter head 70 has an opening that vertically passes through the movable cutter head 70 and a hook extension portion, and the end of the movable cutter head 70 that cooperates with the fixed cutter head 80 has a blade.

[0067] Moreover, the fixed blade head 80 also has a blade on one end that cooperates with the movable blade head 70. The fixed blade head 80 and the movable blade head 70 are staggered in height to cooperate with the tangent line. A notch is provided on the surface of the needle plate 4 to cooperate with the installation of the fixed blade body 83.

[0068] In this embodiment, during the operation of the sewing machine, the rotary shuttle 3 rotates to perform conventional sewing operations. After sewing is completed, the main driving gear 74 reciprocates under the drive of the axe shaft 2, thereby driving the driving half gear 73 to reciprocate. The movable knife body 75, which is transmission-connected to the driving half gear 73 through the knife body connecting seat 750 and the transmission shaft 751, moves with the reciprocating rotation of the driving half gear 73. The movable knife head 70 hooks the sewing thread during the movement of the movable knife body 75, and drives the sewing thread to move toward the fixed knife head 80, so that the sewing thread is cut by the blade on the movable knife head 70 and the blade on the fixed knife head 80. Since the tangent point 9 formed by the movable knife head 70 and the fixed knife head 80 is located at the needle hole 5, the movable knife head 70 and the fixed knife head 80 are connected to each other. At the same time, compared with the traditional moving knife driving method, the traditional moving knife driving is connected to the transmission structure of the sewing machine through an axis extending to the bottom of the rotary hook platform 1 to drive the moving knife, and the rotary hook platform 1 is usually made of cast iron, which makes the axis easy to wear with the rotary hook platform 1 during long-term use. The utility model effectively prevents the phenomenon of reduced stability of the moving knife body 75 due to wear through the arrangement of the axe shaft 2, the main drive gear 74 and the drive half gear 73. The moving knife has high activity stability and the noise generated by the moving knife activity is small.

[0069] Embodiment 3:

[0070] The present embodiment provides a thread cutting mechanism of a sewing machine. In addition to the technical solutions of the above-mentioned embodiments, it also has the following technical features: the horn part 6 also includes: a horn base 60, which is arranged on the rotary hook platform 1; a horn support seat 61, which is arranged on the horn base 60 and extends upward, and the horn support seat 61 is provided with a slot 62 for cooperating with the reciprocating movement of the movable knife body 75; a horn body 63, which is arranged on the horn support seat 61 and is located on one side of the rotary hook 3.

[0071] In this embodiment, during the working process of the sewing machine, the horn main body 63 cooperates with the rotating hook 3 for thread dialing operation. At the same time, through the setting of the slot 62, the horn support seat 61 has the slot 62, which can effectively cooperate with the movement of the moving knife blade body 75, reducing the phenomenon of collision between the moving knife blade body 75 and the horn main body 63 during the movement, ensuring the stable progress of the thread cutting operation.

[0072] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A thread cutting mechanism for a sewing machine, comprising: A rotary shuttle platform (1), wherein an axe shaft (2) is arranged on the rotary shuttle platform (1); A rotary shuttle (3), wherein the rotary shuttle (3) is arranged at the top end of the axe shaft (2); A needle plate (4), the needle plate (4) being arranged on one side of the rotary shuttle (3), and a needle hole (5) being arranged on the needle plate (4); A horn (6), wherein the horn (6) is arranged on the rotary hook platform (1) and is located on one side of the rotary hook (3); It is characterized by further comprising: A movable knife portion (7), the movable knife portion (7) being arranged on the rotary shuttle platform (1), the movable knife portion (7) comprising a movable knife head (70) located below the needle plate (4); A fixed knife part (8), the fixed knife part (8) is arranged on the rotary hook platform (1), and the fixed knife part (8) comprises a fixed knife head (80) located below the needle plate (4); The tangent point (9) formed by the cooperation between the movable cutter head (70) and the fixed cutter head (80) is located below the needle hole (5), and the movable cutter head (70) can move back and forth to perform tangent.

2. A thread cutting mechanism for a sewing machine according to claim 1, characterized in that: The movable knife part (7) further comprises: A movable knife seat (71), wherein the movable knife seat (71) is arranged on the rotary shuttle platform (1), and a gear mounting groove (72) is arranged in the movable knife seat (71); A driving half gear (73), wherein the driving half gear (73) is movably arranged in the gear mounting groove (72); A main driving gear (74), wherein the main driving gear (74) is arranged on the axe shaft (2); A movable knife body (75), wherein the movable knife body (75) is movably arranged on the movable knife seat (71); The main driving gear (74) can reciprocate under the drive of the axe shaft (2), the movable knife body (75) is connected to the driving half gear (73) by transmission and can reciprocate under the drive of the driving half gear (73), the driving half gear (73) is meshed with the main driving gear (74), and the movable knife head (70) is arranged on the movable knife body (75).

3. A thread cutting mechanism for a sewing machine according to claim 2, characterized in that: The movable knife body (75) further comprises: A blade body connecting seat (750), wherein the blade body connecting seat (750) is transmission-connected to the driving half gear (73) via a transmission shaft (751); A movable knife extension arm (752), wherein the movable knife extension arm (752) is arranged on the knife body connecting seat (750) and extends in a horizontal direction to the bottom of the needle plate (4); A support arm (753), the support arm (753) being arranged at one end of the extension arm away from the blade connecting seat (750), and the support arm (753) extending upward to below the needle hole (5); Wherein, the movable cutter head (70) is arranged at the top end of the support arm (753).

4. A thread cutting mechanism for a sewing machine according to claim 3, characterized in that: The fixed blade part (8) further comprises: A fixed knife base (81), wherein the fixed knife base (81) is arranged on the rotary shuttle platform (1); A fixed knife support seat (82), wherein the fixed knife support seat (82) is arranged on the fixed knife base (81) and extends upward to the needle plate (4); A fixed knife body (83), wherein the fixed knife body (83) is arranged at the top end of the fixed knife support seat (82).

5. The thread cutting mechanism of a sewing machine according to claim 4, characterized in that: The fixed blade body (83) further comprises: A fixed knife mounting arm (830), wherein the fixed knife mounting arm (830) is arranged at the top end of the fixed knife supporting seat (82); A fixed knife extension arm (831), wherein the fixed knife extension arm (831) is arranged at the top end of the fixed knife mounting arm (830), and the fixed knife extension arm (831) extends in a horizontal direction to below the pinhole (5); Wherein, the fixed knife head (80) is arranged at one end of the fixed knife extension arm (831) away from the fixed knife installation arm (830).

6. The thread cutting mechanism of a sewing machine according to claim 5, characterized in that: The horn portion (6) further comprises: A horn base (60), wherein the horn base (60) is arranged on the rotary shuttle platform (1); A horn support seat (61), the horn support seat (61) is arranged on the horn base (60) and extends upward, and the horn support seat (61) is provided with a slot (62) for cooperating with the reciprocating movement of the moving knife body (75); The horn body (63) is arranged on the horn support seat (61) and is located on one side of the rotary hook (3).

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