Sewing machine thread separating structure and sewing machine
By optimizing the motion parameters of the eccentric cam and setting the rotating connector and limiting spring, the contact time between the thread divider hook and the top cover of the rotary hook is extended, thus solving the noise problem of the sewing machine's thread dividing structure and improving production efficiency.
Patent Information
- Application Number
- CN202520489396.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-19
AI Technical Summary
The existing sewing machine thread separating structure generates noise during the thread-gathering process due to the collision between the thread separating hook and the top cover of the rotary hook, and the back-and-forth collision between the positioning hook and the needle plate limiting groove. This noise reduces sewing speed and affects production efficiency.
By optimizing the motion parameters of the eccentric cam, the contact time between the dividing hook and the top cover of the rotary hook is increased, and by setting a rotating connector and a limiting spring, a buffer element is added to reduce noise.
It significantly reduces the collision noise between the thread divider hook and the rotary hook cover, improves the operating noise level of the sewing machine, and enhances sewing efficiency.
Smart Images
Figure CN223951377U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of sewing machine technology, and in particular to a sewing machine thread separating structure and a sewing machine. Background Technology
[0002] In the field of sewing technology, sewing machines are essential equipment for joining fabrics together. Early sewing techniques relied primarily on simple needle and thread combinations, which had many limitations when sewing complex fabrics or meeting the demands of large-scale production efficiency. People gradually developed more complex sewing stitches and related components. The advent of sewing machines improved both sewing efficiency and quality.
[0003] In the development of sewing machines, the thread separating mechanism plays a crucial role. Current sewing machine thread separating mechanisms primarily utilize a rotary hook assembly driven by an eccentric wheel to hook the thread. The thread is then separated through the gaps between the positioning hook and the needle plate limiting groove, and between the thread separating hook and the rotary hook cover (boob). During sewing, noise is generated due to the collisions between the thread separating hook and the rotary hook cover, and the back-and-forth collisions between the positioning hook and the needle plate limiting groove. Specifically, after hooking the thread, the eccentric cam rapidly rises and falls, causing the gap between the thread separating hook and the rotary hook cover to go from minimum to maximum and then back to minimum, repeating this cycle. Under the influence of inertia and centrifugal force, the thread separating hook and the rotary hook cover collide, while the positioning hook and the needle plate limiting groove also collide back and forth. Therefore, users can only reduce noise by decreasing the sewing speed of the sewing machine, but reducing the sewing speed also reduces the sewing efficiency. Utility Model Content
[0004] Therefore, it is necessary to provide a sewing machine thread splitting structure and sewing machine that can reduce noise.
[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:
[0006] A sewing machine thread separating structure, comprising:
[0007] Rotary shuttle assembly;
[0008] A top cover for the rotary shuttle is installed inside the rotary shuttle assembly, and the top cover for the rotary shuttle is able to rotate under the drive of the rotary shuttle assembly;
[0009] An eccentric cam is disposed at the bottom of the rotary hook assembly and connected to the rotary hook assembly;
[0010] The line divider hook is connected to the eccentric cam drive, and the line divider hook can collide with / disengage from the rotary hook cover under the drive of the eccentric cam;
[0011] When the thread guide hook abuts against the upper cover of the rotating hook, the rotation angle of the eccentric cam is set as A, and when the thread guide hook is separated from the upper cover of the rotating hook, the rotation angle of the eccentric cam is set as B, wherein A+B=360°, and A>B.
[0012] It can be understood that, by optimizing the motion parameters of the eccentric cam, the rotation angle of the eccentric cam when the thread guide hook abuts against the upper cover of the rotating hook is increased, so that the time of the abutting process of the thread guide hook and the upper cover of the rotating hook is prolonged, the change of the acting force between the thread guide hook and the upper cover of the rotating hook becomes more gentle, which is equivalent to adding a buffer link to the abutting process between the thread guide hook and the upper cover of the rotating hook, so that the noise generated when the thread guide hook abuts against the upper cover of the rotating hook is reduced, and the noise reduction effect is achieved.
[0013] In one of the embodiments, 200°≤A≤300°.
[0014] In one of the embodiments, the thread guide structure of the sewing machine further comprises a thread guide hook rod and a first rotation connecting piece, the first rotation connecting piece is rotationally installed on the thread guide hook rod and abuts against the outer wheel surface of the eccentric cam.
[0015] The thread guide hook is fixedly connected to the thread guide hook rod.
[0016] It can be understood that, by setting the first rotation connecting piece abutting against the eccentric cam, the first rotation connecting piece and the eccentric cam are in motion transmission through rolling friction, which can avoid the noise generated by unstable friction and vibration between the components in the transmission process. At the same time, it can avoid the wear caused by the sliding connection of the first rotation connecting piece.
[0017] In one of the embodiments, the thread guide structure of the sewing machine further comprises a limiting spring, the limiting spring is abutted to the thread guide hook rod in a pre-deformation manner, and is used for pushing the first rotation connecting piece to abut against the outer wheel surface.
[0018] It can be understood that, the limiting spring abuts against the thread guide hook rod in a pre-deformation manner, which can ensure that the first rotation connecting piece can abut against the outer wheel surface of the eccentric cam, so that the driving of the thread guide hook by the eccentric cam in the rotation process can be achieved. It can also avoid the additional vibration noise caused by the poor contact between the eccentric cam and the first rotation connecting piece.
[0019] In one of the embodiments, a second rotation connecting piece is rotationally connected to the thread guide hook rod, and the thread guide hook rod can abut against the limiting spring through the second rotation connecting piece.
[0020] It can be understood that, by setting the second rotating connecting piece, the limiting elastic sheet abuts against the second rotating connecting piece on the wire separating hook rod, which can prevent the wire separating hook rod from being abraded, and the rotation of the second rotating connecting piece enables the first rotating connecting piece on the wire separating hook rod to better abut against the eccentric cam.
[0021] In one of the embodiments, the limiting elastic sheet has a bending portion, and the limiting elastic sheet can abut against the second rotating connecting piece through the bending portion.
[0022] The limiting elastic sheet is configured to be fixed to a machine frame of the sewing machine.
[0023] In one of the embodiments, the first rotating connecting piece and / or the second rotating connecting piece is configured as a bearing.
[0024] In one of the embodiments, the upper cover of the rotating hook is provided with a rotating hook positioning hook.
[0025] The wire separating structure of the sewing machine further comprises a needle plate, the needle plate is provided with a limiting slot, the limiting slot accommodates the rotating hook positioning hook, and is configured to limit the movement of the upper cover of the rotating hook in the rotating hook assembly.
[0026] In one of the embodiments, the rotating hook positioning hook can move back and forth in the limiting slot under the driving of the upper cover of the rotating hook, and the rotating hook positioning hook collides with the slot wall of the limiting slot.
[0027] The application further provides the following technical solutions:
[0028] A sewing machine comprises the wire separating structure of the sewing machine according to any one of the above embodiments.
[0029] Compared with the prior art, the wire separating and noise reduction structure of the sewing machine optimizes and adjusts the movement parameters of the eccentric cam, and increases the rotation angle of the eccentric cam when the wire separating hook collides with the upper cover of the rotating hook. In this way, the collision time of the wire separating hook and the upper cover of the rotating hook is prolonged. Before the optimization and adjustment, the collision between the wire separating hook and the upper cover of the rotating hook is fast and short, and such instantaneous impact is easy to cause a large noise. By increasing the rotation angle of the eccentric cam and prolonging the collision time of the wire separating hook and the upper cover of the rotating hook, the change of the acting force between the wire separating hook and the upper cover of the rotating hook becomes more gentle, which is equivalent to adding a buffer link to the collision process between the wire separating hook and the upper cover of the rotating hook, thereby significantly reducing the noise generated during the collision. BRIEF DESCRIPTION OF DRAWINGS
[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.
[0031] Fig. 1 A structural schematic diagram of the thread separating and noise reducing structure of the sewing machine is provided.
[0032] Fig. 2 A perspective view of the thread separating and noise reducing structure of the sewing machine is provided.
[0033] Fig. 3 Another perspective view of the thread separating and noise reducing structure of the sewing machine is provided.
[0034] The element reference numbers are as follows:
[0035] 100, thread separating structure of the sewing machine; 10, rotating shuttle assembly; 11, shuttle tip; 20, upper cover of the rotating shuttle; 21, rotating shuttle positioning hook; 30, eccentric cam; 31, rotating shaft; 40, thread separating hook; 50, thread separating hook rod; 51, first rotating connecting piece; 52, limiting elastic sheet; 521, bending part; 53, second rotating connecting piece; 54, connecting pin; 60, needle plate; 61, limiting groove; 62, thread passing hole;
[0036] 200, sewing machine; 210, machine frame. DETAILED DESCRIPTION
[0037] In order to make the above purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.
[0038] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the specification of the present application are for illustrative purposes only and do not represent the only implementation.
[0039] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the technical features defined with "first", "second", etc. can explicitly or implicitly include at least one of the technical features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.
[0040] In the present application, unless otherwise explicitly specified and limited, the "on", "under", "above" and "over" of the first feature to the second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "on", "above" and "over" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.
[0041] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by a person skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the related listed items.
[0042] Please refer to Figs. 1 to 3 The present application provides a sewing machine thread separation structure 100, which comprises: a rotating hook assembly 10; a rotating hook upper cover 20, an eccentric cam 30 and a thread separation hook 40, the rotating hook upper cover 20 is installed in the rotating hook assembly 10, and the rotating hook upper cover 20 can be rotated under the driving of the rotating hook assembly 10; the eccentric cam 30 is arranged at the bottom of the rotating hook assembly 10 and connected with the rotating hook assembly 10; the thread separation hook 40 is in transmission connection with the eccentric cam 30, and the thread separation hook 40 can be in contact with / away from the rotating hook upper cover 20 under the driving of the eccentric cam 30; when the thread separation hook 40 contacts the rotating hook upper cover 20, the rotation angle of the eccentric cam 30 is set as A, when the thread separation hook 40 is away from the rotating hook upper cover 20, the rotation angle of the eccentric cam 30 is set as B, wherein A+B=360°, and A>B.
[0043] As can be seen from the above, by optimizing and adjusting the motion parameters of the eccentric cam 30, the rotation angle of the eccentric cam 30 when the thread separating hook 40 collides with the upper cover 20 of the rotating hook is increased. In this way, the time of the process of the thread separating hook 40 colliding with the upper cover 20 of the rotating hook is prolonged. Before the optimization and adjustment, the collision between the thread separating hook 40 and the upper cover 20 of the rotating hook is fast and short, and such instantaneous impact is easy to cause relatively large noise. By increasing the rotation angle of the eccentric cam 30 when the thread separating hook 40 collides with the upper cover 20 of the rotating hook, the time of the collision between the thread separating hook 40 and the upper cover 20 of the rotating hook is prolonged, the change of the force between the thread separating hook 40 and the upper cover 20 of the rotating hook becomes more gentle, which is equivalent to adding a buffer link to the collision process between the thread separating hook 40 and the upper cover 20 of the rotating hook, and thus the noise generated during the collision is significantly reduced.
[0044] In the embodiment, the eccentric cam 30 is eccentrically connected with the rotating shaft 31, and is connected with the driving mechanism on the rack 210 through the rotating shaft 31, so that the eccentric cam 30 can be driven to perform eccentric motion by the driving mechanism. The rotating hook assembly 10 is fixedly connected with the eccentric cam 30 and can perform eccentric motion together with the eccentric cam 30. The rotating hook assembly 10 is provided with a hook tip 11, and the thread separating and separating operations are performed by the hook tip 11.
[0045] Here, 200°≤A≤300°. When 200°≤A≤300°, the force during the collision between the thread separating hook 40 and the upper cover 20 of the rotating hook is gentle, the noise generated during the collision can be significantly reduced, and sufficient angle can be provided for the thread separating hook 40 to separate from the upper cover 20 of the rotating hook.
[0046] As shown in Figs. 1 and 2, the thread separating structure 100 of the sewing machine further comprises a thread separating hook 40, which is arranged on the rotating hook assembly 10 and is used to separate the thread. Fig. 2 and Fig. 3 As shown in Figs. 1 and 2, the thread separating structure 100 of the sewing machine further comprises a thread separating hook 40, which is arranged on the rotating hook assembly 10 and is used to separate the thread.
[0047] In an embodiment, the rotating hook positioning hook 21 can move back and forth in the limiting groove 61 under the driving of the upper cover 20 of the rotating hook, and the rotating hook positioning hook 21 collides with the groove wall of the limiting groove 61. Since the collision time between the thread separating hook 40 and the upper cover 20 of the rotating hook is increased, the movement speed of the upper cover 20 of the rotating hook is slowed down, so that the rotating hook positioning hook 21 collides with the groove wall of the limiting groove 61 at a slower speed. Therefore, the collision frequency between the rotating hook positioning hook 21 and the groove wall of the limiting groove 61 is reduced, so that the noise generated by the collision between the rotating hook positioning hook 21 and the groove wall of the limiting groove 61 can be further reduced.
[0048] In the embodiment, the needle plate 60 is provided with a thread passing hole 62, and the sewing thread can pass through the thread passing hole 62 more smoothly to the area below the needle plate 60 or the periphery. In the sewing process, the needle passes through the thread passing hole 62, brings the sewing thread below the needle plate 60 and forms a thread loop, and the shuttle hook 11 accurately inserts into the thread loop brought by the needle and hooks the sewing thread.
[0049] As shown in Fig. 1 and Fig. 2 , the sewing machine thread distribution structure 100 further comprises a thread distribution hook rod 50 and a first rotating connecting piece 51, the first rotating connecting piece 51 is rotatably installed on the thread distribution hook rod 50 and abuts against the outer wheel surface of the eccentric cam 30; wherein the thread distribution hook 40 is fixedly connected to the thread distribution hook rod 50. By setting the first rotating connecting piece 51 abutting against the eccentric cam 30, the first rotating connecting piece 51 and the eccentric cam 30 conduct motion through rolling friction, which can avoid the noise caused by unstable friction and vibration between components during transmission. At the same time, it can avoid the wear caused by the sliding connection of the first rotating connecting piece 51. Here, the first rotating connecting piece can be configured as a bearing, a shaft sleeve or the like.
[0050] In the embodiment, the first rotating connecting piece 51 is configured as a bearing.
[0051] In the embodiment, the end of the thread distribution hook rod 50 away from the thread distribution hook 40 is fixedly connected to the machine frame 210 by a connecting pin 54, and the first rotating connecting piece 51 reciprocally swings towards the eccentric cam 30 under the driving of the eccentric wheel.
[0052] As shown in Fig. 2 , the sewing machine thread distribution structure 100 further comprises a limiting elastic sheet 52, which abuts against the thread distribution hook rod 50 in a pre-deformation manner, and is used to push the first rotating connecting piece 51 to abut against the outer wheel surface. The limiting elastic sheet 52 abuts against the thread distribution hook rod 50 in a pre-deformation manner, which can ensure that the first rotating connecting piece 51 can abut against the outer wheel surface of the eccentric cam 30, so that the eccentric cam 30 can drive the thread distribution hook 40 during rotation. It can also avoid the additional vibration noise caused by poor contact between the eccentric cam 30 and the first rotating connecting piece 51.
[0053] In an embodiment, the thread distribution hook rod 50 is rotatably connected with a second rotating connecting piece 53, and the thread distribution hook rod 50 can abut against the limiting elastic sheet 52 through the second rotating connecting piece 53. In this way, by setting the second rotating connecting piece 53, the limiting elastic sheet 52 abuts against the second rotating connecting piece 53 on the thread distribution hook rod 50, which can prevent the thread distribution hook rod 50 from being worn, and the rotation of the second rotating connecting piece 53 can make the first rotating connecting piece 51 on the thread distribution hook rod 50 better abut against the eccentric cam 30.
[0054] In the embodiment, the second rotating connecting piece 53 is configured as a bearing.
[0055] As shown in the drawings, in an embodiment, the limiting elastic sheet 52 has a bending part 521, and the limiting elastic sheet 52 can abut against the second rotating connecting piece 53 through the bending part 521; wherein the limiting elastic sheet 52 is used for being fixed to the rack 210 of the sewing machine 200. Fig. 2
[0056] The application further provides the following technical solutions: a sewing machine 200 comprising the sewing machine line dividing structure 100 according to any one of the above embodiments.
[0057] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.
[0058] The above embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.
Claims
1. A sewing machine thread separating structure (100), characterized in that, The sewing machine thread divider structure (100) includes: Rotary shuttle assembly (10); The top cover (20) of the rotary shuttle is installed inside the rotary shuttle assembly (10), and the top cover (20) of the rotary shuttle is able to rotate under the drive of the rotary shuttle assembly (10); An eccentric cam (30) is disposed at the bottom of the rotary shuttle assembly (10) and connected to the rotary shuttle assembly (10); The wire splitter hook (40) is connected to the eccentric cam (30) for transmission, and the wire splitter hook (40) can collide with / disengage from the rotary hook cover (20) under the drive of the eccentric cam (30); When the dividing hook (40) abuts against the rotary hook cover (20), the rotation angle of the eccentric cam (30) is set to A. When the dividing hook (40) disengages from the rotary hook cover (20), the rotation angle of the eccentric cam (30) is set to B. Wherein, A+B=360° and A>B.
2. The sewing machine thread divider structure (100) according to claim 1, characterized in that, 200°≤A≤300°。 3. The sewing machine thread divider structure (100) according to claim 1, characterized in that, The sewing machine thread splitting structure (100) further includes a thread splitting hook rod (50) and a first rotating connector (51), the first rotating connector (51) being rotatably mounted on the thread splitting hook rod (50) and abutting against the outer wheel surface of the eccentric cam (30); The dividing hook (40) is fixedly connected to the dividing hook rod (50).
4. The sewing machine thread divider structure (100) according to claim 3, characterized in that, The sewing machine thread splitting structure (100) also includes a limiting spring (52), which abuts against the thread splitting hook (50) in a pre-deformed manner to push the first rotating connector (51) against the outer wheel surface.
5. The sewing machine thread divider structure (100) according to claim 4, characterized in that, The dividing hook rod (50) is rotatably connected to a second rotating connector (53), and the dividing hook rod (50) can abut against the limiting spring (52) through the second rotating connector (53).
6. The sewing machine thread divider structure (100) according to claim 5, characterized in that, The limiting spring (52) has a bent portion (521), and the limiting spring (52) can abut against the second rotating connector (53) through the bent portion (521); The limiting spring (52) is used to fix it to the frame (210) of the sewing machine (200).
7. The sewing machine thread divider structure (100) according to claim 5, characterized in that, The first rotating connector (51) and / or the second rotating connector (53) are configured as bearings.
8. The sewing machine thread divider structure (100) according to claim 1, characterized in that, The rotary hook cover (20) is provided with a rotary hook positioning hook (21); The sewing machine thread splitting structure (100) further includes a needle plate (60), on which a limiting groove (61) is provided. The limiting groove (61) accommodates the rotary hook positioning hook (21) and is used to limit the movement of the rotary hook cover (20) within the rotary hook assembly (10).
9. The sewing machine thread divider structure (100) according to claim 8, characterized in that, The rotary hook (21) can move back and forth in the limiting groove (61) under the drive of the rotary hook cover (20), and cause the rotary hook (21) to collide with the groove wall of the limiting groove (61).
10. A sewing machine (200), characterized in that, Includes the sewing machine thread divider structure (100) as described in any one of claims 1-9.