Sewing machine needle-bending clutch mechanism and sewing machine
Patent Information
- Application Number
- CN202522201904.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-17
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-10-17
AI Technical Summary
在这种结构中，弯针架在使用较长时间后会出现一定的偏移，会导致限位孔与限位杆在轴向上无法对齐，从而造成限位杆与限位孔无法精准的配合，可能会出现限位杆插入限位孔后难以拔出或限位杆无法插入限位孔的问题，影响缝纫机弯针离合机构的使用体验
[0023]在其中一个实施例中，所述弯针机构还包括挡圈，所述挡圈用于固定设置在传动轴上，并与所述弯针架抵靠；
Smart Images
Figure CN224784449U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of sewing machine bend clutch control technology, and in particular to a sewing machine bend clutch mechanism and a sewing machine. Background Technology
[0002] In the daily use and maintenance of sewing machines, the flexible threading operation of the looper is a crucial aspect of ensuring the normal operation of the equipment. To facilitate threading, the looper usually needs to be equipped with a clutch mechanism to control its ejection during threading, thus providing the user with sufficient operating space.
[0003] In existing technology, the looper clutch mechanism used in sewing machines includes a looper holder mounted on the drive shaft and a limiting rod mounted on the housing. By providing a limiting hole on the looper holder, the looper holder can be ejected or reset by inserting or removing the limiting rod into or from the limiting hole. In this structure, the looper holder may shift after prolonged use, causing the limiting hole and the limiting rod to misalign axially. This results in inaccurate engagement between the limiting rod and the limiting hole, potentially leading to problems such as the limiting rod being difficult to remove after insertion or being unable to be inserted at all, thus affecting the user experience of the sewing machine's looper clutch mechanism. Utility Model Content
[0004] Therefore, it is necessary to provide a sewing machine bend clutch mechanism that can solve the above problems.
[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:
[0006] A sewing machine looper clutch mechanism includes a looper holder for carrying a looper, the looper holder being rotatably mounted on a drive shaft and having a tendency to move from a first position to a second position. The sewing machine looper clutch mechanism further includes:
[0007] A drive crank for fixing to the drive shaft;
[0008] A rotating component, rotatably mounted on the transmission crank;
[0009] A stop mechanism, comprising a stop protrusion and a stop groove, wherein one of the stop protrusion and the stop groove is disposed on the rotating member, and the other is disposed on the bending needle holder;
[0010] When the needle bending frame is in the first position, the stop protrusion and the stop groove form a stop engagement to lock the transmission crank with the rotating component and allow the needle bending frame to move synchronously with the transmission shaft; when the needle bending frame is in the second position, the stop protrusion and the stop groove disengage from each other and release the lock between the transmission crank and the rotating component, allowing the needle bending frame to move independently with the transmission shaft.
[0011] Understandably, this application, by setting a transmission crank, a rotating component, and a stop mechanism, places the rotating component on the transmission crank fixed to the transmission shaft. Then, the stop protrusions and grooves respectively located on the looper frame and the rotating component engage to limit the looper frame's position. This reduces the positional accuracy requirements of the stop mechanism on the looper frame, increases tolerance for assembly errors, and thus reduces assembly difficulty. Simultaneously, the stop protrusions and grooves ensure smoother triggering and disengagement of the stop engagement during the transition between the first and second positions of the looper frame, guaranteeing stable operation of the sewing machine's looper clutch mechanism.
[0012] In one embodiment, the stop protrusion is disposed on the bending needle holder, and the stop groove is disposed on the rotating member;
[0013] The stop mechanism further includes a first elastic element, one end of which is connected to the transmission crank, and the other end is connected to the rotating element;
[0014] The stop groove is located at one end of the rotating member near the stop protrusion. Driven by the first elastic member, the stop groove tends to move toward the stop protrusion.
[0015] In one embodiment, the sewing machine looper clutch mechanism further includes a first limiting member disposed on the transmission crank;
[0016] When the bending needle holder is in the second position, the rotating member abuts against the first limiting member.
[0017] In one embodiment, the rotating member has a bent section formed thereon, and the bent section has a pressing surface on the side opposite to the drive crank.
[0018] The pressing surface responds to external pressing force to move the stop groove away from the stop protrusion and disengage from the stop groove, thereby releasing the lock between the transmission crank and the rotating member.
[0019] In one embodiment, a guide surface is formed on the rotating member, the guide surface being disposed on the side of the rotating member facing the stop protrusion, and used to guide the stop protrusion into the stop groove.
[0020] In one embodiment, the sewing machine looper clutch mechanism further includes a second elastic element, one end of which is limited to the transmission crank and the other end of which is limited to the looper frame;
[0021] Driven by the second elastic element, the bent needle holder tends to move from the first position to the second position.
[0022] In one embodiment, the sewing machine looper clutch mechanism further includes a second limiting member, which is fixedly connected to the drive shaft; and when the looper frame is in the second position, the looper frame abuts against and is limited by the second limiting member.
[0023] In one embodiment, the bending mechanism further includes a retaining ring, which is fixedly mounted on the drive shaft and abuts against the bending needle holder;
[0024] The second limiting member is disposed on the retaining ring. A weight-reducing hole is provided on the transmission crank.
[0025] This application also provides the following technical solutions:
[0026] A sewing machine includes a drive shaft and a sewing machine looper clutch mechanism as described in any of the above embodiments.
[0027] Compared with existing technologies, the described sewing machine looper clutch mechanism, by setting up a transmission crank, a rotating component, and a stop mechanism, places the rotating component on the transmission crank fixed to the transmission shaft. Then, the stop protrusions and grooves respectively located on the looper frame and the rotating component engage to limit the looper frame's position. This reduces the positional accuracy requirements of the stop mechanism on the looper frame, increases the tolerance for assembly errors, and thus reduces assembly difficulty. Simultaneously, the stop protrusions and grooves ensure smoother triggering and disengagement of the stop engagement during the transition between the first and second positions of the looper frame, guaranteeing the stable operation of the sewing machine looper clutch mechanism. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of the structure of the needle looper clutch mechanism of a sewing machine from a one-view perspective, provided for this application.
[0030] Figure 2 For this application Figure 1 Enlarged view of point A in the middle.
[0031] Figure 3 This is a structural schematic diagram of the needle looper clutch mechanism of a sewing machine, provided as another perspective for this application.
[0032] Figure 4 This is a schematic diagram of the rotating component provided in this application.
[0033] Figure 5 An exploded view of the needle bend clutch mechanism of the sewing machine provided in this application.
[0034] The component labels are as follows:
[0035] 100. Sewing machine looper clutch mechanism; 10. Looper holder; 20. Transmission crank; 21. Weight reduction hole; 30. Rotating component; 31. Bending section; 32. Pressing surface; 33. Extension section; 34. Guide surface; 40. Stop mechanism; 41. Stop protrusion; 42. Stop groove; 43. First elastic element; 50. First limiting element; 60. Second elastic element; 70. Second limiting element; 80. Retaining ring;
[0036] 200. Drive shaft. Detailed Implementation
[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.
[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.
[0042] Please see Figures 1 to 5 This application provides a sewing machine looper clutch mechanism 100, which is used to be installed on a sewing machine and to control the synchronous or independent movement of the looper frame 10 and the drive shaft 200 on the sewing machine.
[0043] Specifically, the sewing machine looper clutch mechanism 100 includes a looper holder 10 for carrying the looper, a transmission crank 20, a rotating member 30, and a stop mechanism 40. The looper holder 10 is rotatably mounted on the transmission shaft 200 and has a tendency to move from a first position to a second position. The transmission crank 20 is fixed to the transmission shaft 200. The rotating member 30 is rotatably mounted on the transmission crank 20. The stop mechanism 40 includes a stop protrusion 41 and a stop groove 42, with one of the stop protrusion 41 and the stop groove 42 being provided. One component is mounted on the rotating member 30, and the other is mounted on the needle holder 10. When the needle holder 10 is in the first position, the stop protrusion 41 and the stop groove 42 form a stop engagement to lock the transmission crank 20 with the rotating member 30 and allow the needle holder 10 to move synchronously with the transmission shaft 200. When the needle holder 10 is in the second position, the stop protrusion 41 and the stop groove 42 disengage from each other and release the lock between the transmission crank 20 and the rotating member 30, so that the needle holder 10 and the transmission shaft 200 can move independently. Thus, this application, by setting a transmission crank 20, a rotating component 30, and a stop mechanism 40, with the rotating component 30 mounted on the transmission crank 20 fixed to the transmission shaft 200, utilizes the stop protrusion 41 and stop groove 42 respectively mounted on the looper frame 10 and the rotating component 30 to achieve the limiting of the looper frame 10. This reduces the positional accuracy requirements of the stop mechanism 40 on the looper frame 10, increases the tolerance for assembly errors, and reduces assembly difficulty. Simultaneously, the stop protrusion 41 and stop groove 42 ensure smoother triggering and disengagement of the stop engagement during the movement of the looper frame 10 in the first and second positions, guaranteeing the stable operation of the sewing machine looper clutch mechanism 100.
[0044] like Figure 3 As shown, the transmission crank 20 has a weight-reducing hole 21 to reduce its weight. This lightweight design not only saves manufacturing materials but also reduces the load on the transmission shaft 200 during operation, thereby improving the transmission efficiency of the transmission shaft 200. Here, the transmission crank 20 can be fixed to the transmission shaft 200 by means of screw fixing, snap-fit fixing, etc.
[0045] like Figure 1 , Figure 2 and Figure 4 As shown, the rotating member 30 is rotatably mounted on the transmission crank 20 and has a bent section 31. A pressing surface 32 is formed on the side of the bent section 31 facing away from the transmission crank 20. The pressing surface 32, in response to external pressing force, causes the stop groove 42 to move away from the stop protrusion 41 and disengage from the stop groove 42, thereby releasing the lock between the transmission crank 20 and the rotating member 30. Thus, by providing the pressing surface 32, the user can control the rotation of the rotating member 30 by pressing the pressing surface 32 during use, causing the stop protrusion 41 to disengage from the stop groove 42, thereby facilitating user operation.
[0046] Here, the rotating component 30 can be rotatably mounted on the transmission crank 20 via a rotating pin, shaft, or other structure.
[0047] In this embodiment, an extension section 33 is also provided on the bent section 31 to make the area of the pressing surface 32 larger, thereby making it easier for the user to apply pressure to the pressing surface 32 and improving the user experience.
[0048] In one embodiment, a guide surface 34 is formed on the rotating member 30. The guide surface 34 is disposed on the side of the rotating member 30 facing the stop protrusion 41 and is used to guide the stop protrusion 41 into the stop groove 42. Thus, by providing the guide surface 34, when the stop protrusion 41 moves towards the stop groove 42, it can move along the guide surface 34 and push against the rotating member 30 through the guide surface 34 to smoothly slide into the stop groove 42, making the engagement process between the stop protrusion 41 and the stop groove 42 smoother. Here, the guide surface 34 can be an arc-shaped surface, a flat surface, or the like.
[0049] like Figures 1 to 3 As shown, the stop protrusion 41 is disposed on the bending needle holder 10, and the stop groove 42 is disposed on the rotating member 30; the stop mechanism 40 also includes a first elastic member 43, one end of which is connected to the transmission crank 20, and the other end is connected to the rotating member 30; the stop groove 42 is disposed at the end of the rotating member 30 near the stop protrusion 41, and driven by the first elastic member 43, the stop groove 42 has a tendency to move toward the stop protrusion 41. It should be noted that the stop protrusion 41 here can be a cylindrical or elliptical cylindrical stop block, stop pin, or other structure.
[0050] Furthermore, the two ends of the first elastic element 43 can be limited to the rotating element 30 and the transmission crank 20 respectively by setting screws, limit pins and other structures.
[0051] Here, the first elastic element 43 can be configured as a spring, spring sheet, or other structure.
[0052] like Figure 1 , Figure 2 and Figure 3As shown, the sewing machine looper clutch mechanism 100 also includes a first limiting member 50, which is disposed on the transmission crank 20. When the looper frame 10 is in the second position, the rotating member 30 abuts against the first limiting member 50. After the first elastic member 43 is provided, when the stop protrusion 41 and the stop groove 42 separate, the rotating member 30 will move clockwise under the force of the first elastic member 43 until the elastic force of the first elastic member 43 disappears. During this process, if the rotation amplitude of the rotating member 30 is too large, the stop protrusion 41 may not be able to enter the stop groove 42 along the guide surface 34. By providing the first limiting member 50, when the stop protrusion 41 and the stop groove 42 separate, the rotating member 30 abuts against the first limiting member 50, which can prevent the rotation amplitude of the rotating member 30 from being too large, thereby ensuring that when the looper frame 10 rotates from the second position back to the first position, the stop protrusion 41 can engage with the stop groove 42.
[0053] Here, the first limiting member 50 can be configured as a limiting pin, a protruding post, or a limiting block, etc.
[0054] like Figure 2 and Figure 3 As shown, the sewing machine looper clutch mechanism 100 also includes a second elastic element 60, one end of which is limited to the transmission crank 20 and the other end is limited to the looper frame 10; wherein, driven by the second elastic element 60, the looper frame 10 has a tendency to move from the first position to the second position.
[0055] Preferably, the second elastic element 60 is configured as a torsion spring.
[0056] In one embodiment, the sewing machine looper clutch mechanism 100 further includes a second limiting member 70, which is fixedly connected to the drive shaft 200; and when the looper frame 10 is in the second position, the looper frame 10 abuts against the second limiting member 70 for limitation. Here, the second limiting member 70 can be configured as a limiting pin, a limiting protrusion, or a limiting baffle, etc.
[0057] In this embodiment, the bending mechanism further includes a retaining ring 80, which is fixedly mounted on the transmission shaft 200 and abuts against the bending needle holder 10; wherein, the second limiting member 70 is disposed on the retaining ring 80. Thus, by setting the retaining ring 80 and placing the second limiting member 70 on the retaining ring 80, on the one hand, the retaining ring 80 can be used to limit the bending needle holder 10 to prevent excessive displacement of the bending needle holder 10, and on the other hand, the second limiting member 70 can achieve good contact with the bending needle holder 10 to limit the bending needle holder 10 to the second position.
[0058] The following describes the operation of the sewing machine's looper clutch mechanism 100:
[0059] 1. When the needle holder 10 needs to pop out for threading, the needle holder 10 is in the first position and can move synchronously with the drive shaft 200. When the user presses the pressing surface 32, it can overcome the elastic force of the first elastic member 43, causing the rotating member 30 to rotate counterclockwise. As the rotating member 30 rotates, the stop protrusion 41 disengages from the stop groove 42. After the needle holder 10 is moved to the second position by the action of the second elastic member 60, it stops rotating after abutting against the second limiting member 70. At this time, the needle holder 10 and the drive shaft 200 do not rotate synchronously with the drive shaft 200.
[0060] 2. When the user releases the pressing surface 32, the rotating part 30 rotates clockwise due to the elastic force of the first elastic element 43. The rotating part 30 then comes into contact with the first limiting element 50 and stops rotating.
[0061] 3. After the threading is completed, the user pushes the looper 10 to overcome the elastic force of the second elastic element 60, so that the looper 10 moves counterclockwise. As the looper 10 rotates, the stop protrusion 41 enters the stop groove 42 along the guide surface 34 to form a stop limit. The looper 10 returns to the first position and can move synchronously with the transmission shaft 200.
[0062] This application also provides the following technical solutions:
[0063] A sewing machine includes a drive shaft 200 and a sewing machine looper clutch mechanism 100 as described in any of the above embodiments.
[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.
Claims
1. A sewing machine looper clutch mechanism, comprising a looper holder (10) for carrying a looper, the looper holder (10) being rotatably mounted on a drive shaft (200) and having a tendency to move from a first position to a second position, characterized in that, The sewing machine looper clutch mechanism (100) also includes: A transmission crank (20) is used to fix the transmission shaft (200). Rotating component (30) is rotatably mounted on the transmission crank (20); The stop mechanism (40) includes a stop protrusion (41) and a stop groove (42). One of the stop protrusion (41) and the stop groove (42) is disposed on the rotating member (30), and the other is disposed on the bent needle holder (10). When the bender frame (10) is in the first position, the stop protrusion (41) and the stop groove (42) form a stop engagement to lock the transmission crank (20) and the rotating member (30), and allow the bender frame (10) and the transmission shaft (200) to move synchronously; when the bender frame (10) is in the second position, the stop protrusion (41) and the stop groove (42) disengage from each other and release the lock between the transmission crank (20) and the rotating member (30), so that the bender frame (10) and the transmission shaft (200) can move independently.
2. The sewing machine looper clutch mechanism according to claim 1, characterized in that, The stop protrusion (41) is disposed on the bending needle frame (10), and the stop groove (42) is disposed on the rotating member (30); The stop mechanism (40) further includes a first elastic element (43), one end of which is connected to the transmission crank (20), and the other end is connected to the rotating element (30); The stop groove (42) is disposed at one end of the rotating member (30) near the stop protrusion (41) and is driven by the first elastic member (43). The stop groove (42) has a tendency to move toward the stop protrusion (41).
3. The sewing machine looper clutch mechanism according to claim 2, characterized in that, The sewing machine looper clutch mechanism (100) further includes a first limiting member (50), which is disposed on the transmission crank (20); When the bent needle holder (10) is in the second position, the rotating member (30) abuts against the first limiting member (50).
4. The sewing machine looper clutch mechanism according to claim 2, characterized in that, A bent section (31) is formed on the rotating part (30), and a pressing surface (32) is formed on the side opposite to the transmission crank (20). The pressing surface (32) responds to external pressing force to move the stop groove (42) away from the stop protrusion (41) and disengage from the stop groove (42) to release the lock between the transmission crank (20) and the rotating member (30).
5. The sewing machine looper clutch mechanism according to claim 2, characterized in that, A guide surface (34) is formed on the rotating member (30). The guide surface (34) is disposed on the side of the rotating member (30) facing the stop protrusion (41) and is used to guide the stop protrusion (41) into the stop groove (42).
6. The sewing machine looper clutch mechanism according to claim 1, characterized in that, The sewing machine looper clutch mechanism (100) further includes a second elastic element (60), one end of which is limited to the transmission crank (20), and the other end is limited to the looper frame (10). Driven by the second elastic element (60), the bent needle holder (10) tends to move from the first position to the second position.
7. The sewing machine looper clutch mechanism according to claim 1, characterized in that, The sewing machine bend clutch mechanism (100) further includes a second limiting member (70), which is fixedly connected to the transmission shaft (200); and when the bend holder (10) is in the second position, the bend holder (10) abuts against the second limiting member (70) for a limiting position.
8. The sewing machine looper clutch mechanism according to claim 7, characterized in that, The sewing machine looper clutch mechanism (100) also includes a retaining ring (80), which is fixedly mounted on the drive shaft (200) and abuts against the looper frame (10); The second limiting member (70) is disposed on the retaining ring (80).
9. The sewing machine looper clutch mechanism according to claim 1, characterized in that, The transmission crank (20) has a weight reduction hole (21).
10. A sewing machine, characterized in that, It includes a drive shaft (200) and a sewing machine looper clutch mechanism (100) as described in any one of claims 1-9.