Thread trimming assembly, rotating shuttle mechanism and sewing machine

Abstract

The utility model relates to a thread trimming assembly, a rotating shuttle mechanism and a sewing machine, and the thread trimming assembly comprises a driving structure; the transmission structure is connected with the driving structure; the thread trimming structure comprises a first thread trimming arm and a second thread trimming arm, the first thread trimming arm and the second thread trimming arm are both connected with the transmission structure, the first thread trimming arm and the second thread trimming arm are provided with thread trimming positions close to each other, or the first thread trimming arm and the second thread trimming arm are provided with to-be-trimmed positions far away from each other. According to the technical scheme, the problem that in the prior art, when a sewing machine conducts thread trimming, the thread trimming error is large is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of sewing machines, and in particular to a thread trimming assembly, a rotary hook mechanism and a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. Sewing machines include sewing machines, stitching machines, embroidery machines, and quilting machines.

[0003] The sewing work of the sewing machine is mainly completed by the cooperation of the feed dog, the needle and the rotary shuttle. After sewing, the sewing thread needs to be cut. In some existing technologies, manual thread cutting is used, which is time-consuming and laborious. Some existing technologies also use mechanical thread cutting, such as electromagnet adsorption. Such a structure has a large error when cutting the thread, and sometimes the sewing thread is difficult to cut. Utility Model Content

[0004] The present application provides a thread trimming assembly, a rotary hook mechanism and a sewing machine, so as to solve the problem of large thread trimming error when the sewing machine in the prior art trims the thread.

[0005] A wire trimming assembly provided according to the present application includes: a driving structure; a transmission structure, which is connected to the driving structure; and a wire trimming structure, which includes a first wire trimming arm and a second wire trimming arm, which are both connected to the transmission structure, and the first wire trimming arm and the second wire trimming arm have wire trimming positions close to each other, or the first wire trimming arm and the second wire trimming arm have wire trimming positions far away from each other.

[0006] Furthermore, the wire cutting assembly includes a sleeve, and the wire cutting structure also includes a first ring and a second ring. The first wire cutting arm is connected to the first ring, and the second wire cutting arm is connected to the second ring. The first ring and the second ring are both rotatably mounted on the circumferential outer side of the sleeve.

[0007] Furthermore, the thread trimming structure further comprises a first driving arm and a second driving arm, the first driving arm is rotatably connected to the first sleeve ring and the transmission structure, and the second driving arm is rotatably connected to the second sleeve ring and the transmission structure.

[0008] Furthermore, the outer wall of the first ring has a first protrusion, the outer wall of the second ring has a second protrusion, the first end of the first driving arm is rotatably connected to the first protrusion, the second end of the first driving arm is rotatably connected to the transmission structure, the first end of the second driving arm is rotatably connected to the second protrusion, and the second end of the second driving arm is rotatably connected to the transmission structure.

[0009] Furthermore, the transmission structure includes a driving gear, a driven gear, a transmission rod and a connecting part, the driving gear is arranged at the output end of the driving structure, the driven gear is arranged on the transmission rod, the driving gear and the driven gear are meshed with each other, the connecting part is arranged on the transmission rod, and the first driving arm and the second driving arm are both rotatably connected to the connecting part.

[0010] Furthermore, the connecting part is a connecting rod, the transmission rod is connected between the first end of the connecting rod and the second end of the connecting rod, the second end of the first driving arm is rotatably connected to the first end of the connecting rod, and the second end of the second driving arm is rotatably connected to the second end of the connecting rod.

[0011] Furthermore, the first thread cutting arm includes a first arm body and a first knife body, the second thread cutting arm includes a second arm body and a second knife body, the first knife body is detachably connected to the first arm body via a first fastener, and the second knife body is detachably connected to the second arm body via a second fastener.

[0012] According to another aspect of the present application, a rotary hook mechanism is further provided, which includes a rotary hook shaft and a thread trimming assembly. The thread trimming assembly is the above-mentioned thread trimming assembly, and the thread trimming structure of the thread trimming assembly is sleeved on the circumferential outer side of the rotary hook shaft.

[0013] According to another aspect of the present application, a sewing machine is further provided. The sewing machine includes a sewing machine body and a thread trimming assembly arranged on the sewing machine body. The thread trimming assembly is the above-mentioned thread trimming assembly.

[0014] Furthermore, the sewing machine includes a sewing machine body, a control component, a rotary hook component, a feed dog component and a thread trimmer component. The feed dog component and the thread trimmer component are both arranged on the rotary hook shaft of the rotary hook component. The control component is electrically connected to the rotary hook component, the feed dog component and the thread trimmer component.

[0015] By applying the technical solution of the present application, the driving structure drives the first and second wire cutting arms to cut the wires through the transmission structure, so that the first and second wire cutting arms both cut the wires under the driving action of the driving structure, and the wire cutting effect is better.

[0016] The thread cutting is relatively stable, and it is not easy to have a large thread cutting error or even a situation where the thread cannot be cut. The technical solution of the present application effectively solves the problem of large thread cutting error when the sewing machine in the prior art cuts the thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 A schematic diagram of the assembly structure of the thread trimmer assembly of the first embodiment of the present application is shown;

[0020] Figure 2 Shows Figure 1 A schematic diagram of the three-dimensional structure of the thread trimming assembly from another angle;

[0021] Figure 3 Shows Figure 1 A schematic diagram of the three-dimensional structure of the connecting part of the thread trimming assembly;

[0022] Figure 4 Shows Figure 1 A schematic diagram of the three-dimensional structure of the first driving arm of the thread trimming assembly;

[0023] Figure 5 Shows Figure 1 A schematic diagram of the three-dimensional structure of the second driving arm of the thread trimming assembly;

[0024] Figure 6 Shows Figure 1 A schematic three-dimensional structural diagram of a first thread trimming arm of a thread trimming assembly;

[0025] Figure 7 Shows Figure 1 A schematic three-dimensional structural diagram of the second thread trimming arm of the thread trimming assembly.

[0026] The above drawings include the following reference numerals:

[0027] 10. Driving structure; 20. Transmission structure; 21. Driving gear; 22. Driven gear; 23. Transmission rod; 24. Connecting part; 30. Thread trimming structure; 31. First thread trimming arm; 32. Second thread trimming arm; 33. First driving arm; 34. Second driving arm; 35. First sleeve; 36. Second sleeve; 40. Sleeve. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0031] like Figures 1 to 7 As shown, the thread trimming assembly of the first embodiment includes: a driving structure 10, a transmission structure 20, and a thread trimming structure 30, wherein the transmission structure 20 is connected to the driving structure 10. The thread trimming structure 30 includes a first thread trimming arm 31 and a second thread trimming arm 32, wherein the first thread trimming arm 31 and the second thread trimming arm 32 are both connected to the transmission structure 20, and the first thread trimming arm 31 and the second thread trimming arm 32 have thread trimming positions close to each other, or the first thread trimming arm 31 and the second thread trimming arm 32 have positions to be trimmed away from each other.

[0032] By applying the technical solution of this embodiment, the driving structure 10 drives the first thread trimming arm 31 and the second thread trimming arm 32 to trim the thread through the transmission structure 20, so that the first thread trimming arm 31 and the second thread trimming arm 32 both trim the thread under the driving action of the driving structure 10, and the thread trimming effect is better, the thread trimming is more stable, and it is not easy to have a large thread trimming error or even a situation where the thread cannot be trimmed. The technical solution of this embodiment effectively solves the problem of large thread trimming errors in the sewing machine in the prior art when trimming the thread.

[0033] It should be noted that when the thread trimming assembly of this embodiment is used in a sewing machine, it needs to be used in conjunction with the rotary hook and the feed dog. The thread trimming structure 30 is arranged corresponding to the needle through hole of the machine table of the sewing machine.

[0034] like Figure 1 and Figure 2As shown, in the technical solution of this embodiment, the thread trimming assembly includes a sleeve 40, the thread trimming structure 30 also includes a first sleeve 35 and a second sleeve 36, the first thread trimming arm 31 is connected to the first sleeve 35, the second thread trimming arm 32 is connected to the second sleeve 36, and the first sleeve 35 and the second sleeve 36 are both rotatably sleeved on the circumferential outer side of the sleeve 40. The arrangement of the sleeve 40 isolates the rotary hook shaft from the first sleeve 35 and the second sleeve 36, thereby avoiding the situation where the first sleeve 35 and the second sleeve 36 interfere with the rotary hook shaft when the rotary hook shaft drives the rotary hook to move at a high speed.

[0035] like Figures 1 to 5 As shown, in the technical solution of this embodiment, the thread trimming structure 30 further includes a first driving arm 33 and a second driving arm 34. The first driving arm 33 is rotatably connected to the first collar 35 and the transmission structure 20, and the second driving arm 34 is rotatably connected to the second collar 36 and the transmission structure 20. The arrangement of the first driving arm 33 and the second driving arm 34 further ensures that the arrangement between the transmission structure 20 and the thread trimming structure 30 is relatively flexible.

[0036] like Figures 1 to 7 As shown, in the technical solution of this embodiment, the outer wall of the first collar 35 has a first protrusion, the outer wall of the second collar 36 has a second protrusion, the first end of the first driving arm 33 is rotatably connected to the first protrusion, the second end of the first driving arm 33 is rotatably connected to the transmission structure 20, the first end of the second driving arm 34 is rotatably connected to the second protrusion, and the second end of the second driving arm 34 is rotatably connected to the transmission structure 20. The arrangement of the first protrusion and the second protrusion facilitates the rotatable connection with the first driving arm 33 and the second driving arm 34. It should be noted that in the technical solution of this embodiment, the first driving arm 33 and the second driving arm 34 are both arc-shaped arms, and the first driving arm 33 and the second driving arm 34 are both convex in the direction away from the sleeve 40, so that the first driving arm 33 and the second driving arm 34 can effectively avoid interference with other components during the movement. As other embodiments, the first driving arm 33 and the second driving arm 34 are convex outwards, not arc-shaped, but polygonal.

[0037] like Figure 1 and Figure 2As shown, in the technical solution of this embodiment, the transmission structure 20 includes a driving gear 21, a driven gear 22, a transmission rod 23 and a connecting portion 24, the driving gear 21 is arranged at the output end of the driving structure 10, the driven gear 22 is arranged on the transmission rod 23, the driving gear 21 and the driven gear 22 are meshed, the connecting portion 24 is arranged on the transmission rod 23, and the first driving arm 33 and the second driving arm 34 are both rotatably connected to the connecting portion 24. In this embodiment, the driving structure 10 is a driving motor. The driving gear 21 is installed on the output shaft of the driving motor, and the driving gear 21 and the driven gear 22 are meshed to transmit smoothly and transmit large power. The setting of the transmission rod 23 can transmit the power of the driving motor to a farther distance. The setting of the connecting portion 24 is convenient for setting the first thread trimming arm 31 and the second thread trimming arm 32.

[0038] like Figures 1 to 3 As shown, in the technical solution of this embodiment, the connecting part 24 is a connecting rod, the transmission rod 23 is connected between the first end of the connecting rod and the second end of the connecting rod, the second end of the first driving arm 33 is rotatably connected to the first end of the connecting rod, and the second end of the second driving arm 34 is rotatably connected to the second end of the connecting rod. The rotation of the connecting rod can be converted into the rotation of the first driving arm 33 and the second driving arm 34, so that the first thread cutting arm 31 and the second thread cutting arm 32 can cut the sewing line. It should be noted that the connecting rod is also convex outward, and can be arc-shaped or non-arc-shaped. The connecting rod rotates around the central axis of the transmission rod, forming the first thread cutting arm 31 and the second thread cutting arm 32 close to each other. The above structure is compact and easy to operate.

[0039] like Figure 6 and Figure 7 As shown, in the technical solution of the first embodiment, the first thread cutting arm 31 includes a first arm body and a first knife body, the second thread cutting arm 32 includes a second arm body and a second knife body, the first knife body is detachably connected to the first arm body by a first fastener, and the second knife body is detachably connected to the second arm body by a second fastener. It should be noted that the blade of the first knife body faces the second knife body, the blade of the second knife body faces the first knife body, the blade of the second knife body has a groove, the sewing line can be guided into the groove, the blade of the first knife body and the blade of the second knife body form a force on the sewing line under the action of the driving structure 10, so that the sewing line is cut off. The first knife body and the second knife body are consumable parts, and the above-mentioned method of connecting by the first fastener and the second fastener facilitates the replacement of the first knife body and the second knife body. The blade of the above-mentioned first knife body can be flat, and the blade of the second knife body has multiple grooves.

[0040] It should be noted that in the technical solution of embodiment 1, the first thread cutting arm 31 and the second thread cutting arm 32 are driven simultaneously, so that the first thread cutting arm 31 and the second thread cutting arm 32 move toward the sewing line at the same time when cutting the sewing line. This can ensure that the sewing line is in the center position to the greatest extent, thereby ensuring that the sewing line is pulled out less and ensuring the accuracy of cutting the sewing parts.

[0041] The difference between the technical solution of the second embodiment and the technical solution of the first embodiment is that the blade of the first blade body is not flat but protrudes toward the second blade body. The blade of the second blade body also has a groove.

[0042] The difference between the technical solution of the third embodiment and the technical solution of the first embodiment is that the blade of the first blade body is concave inwards, and the blade of the second blade body also has a groove.

[0043] The present application also provides a rotary hook mechanism, which includes a rotary hook shaft and a thread trimming assembly, wherein the thread trimming assembly is the above-mentioned thread trimming assembly, and the thread trimming structure 30 of the thread trimming assembly is sleeved on the circumferential outer side of the rotary hook shaft. The rotary hook shaft of the present application forms a limit for the thread trimming assembly, and such a structure is compact. There is a gap between the rotary hook and the thread trimming assembly on the rotary hook shaft, so that the rotary hook shaft is more convenient when adjusting axially.

[0044] The present application also provides a sewing machine, which includes a sewing machine body and a thread trimming assembly arranged on the sewing machine body, and the thread trimming assembly is the above-mentioned thread trimming assembly. The sewing machine includes a sewing machine body, a control assembly, a rotary hook assembly, a feed dog assembly and a thread trimming assembly, the feed dog assembly and the thread trimming assembly are both arranged on a rotary hook shaft of the rotary hook assembly, and the control assembly is electrically connected to the rotary hook assembly, the feed dog assembly and the thread trimming assembly.

[0045] The feed dog assembly includes: a tooth rack structure, a first tooth rack shaft structure, a second tooth rack shaft structure, a first crank connecting rod structure, a second crank connecting rod structure and an adjustment drive structure. The first end of the tooth rack structure is rotatably matched with the first tooth rack shaft structure. The second end of the tooth rack structure is movably matched with the second tooth rack shaft structure. The first end of the first crank connecting rod structure is matched with the rotary shuttle shaft, and the second end of the first crank connecting rod structure is rotatably connected to the first tooth rack shaft structure. The first end of the second crank connecting rod structure is matched with the rotary shuttle shaft, and the second end of the second crank connecting rod structure is rotatably connected to the second tooth rack shaft structure. The adjustment drive structure is connected to the first tooth rack shaft structure to drive the first tooth rack shaft structure to rotate along the central axis of the first tooth rack shaft structure.

[0046] The rotary shuttle shaft drives the first crank-connecting rod structure, and the first crank-connecting rod structure drives the first tooth frame shaft structure. At the same time, the rotary shuttle shaft drives the second crank-connecting rod structure, and the second crank-connecting rod structure drives the second tooth frame shaft structure. The first tooth frame shaft structure and the second tooth frame shaft structure cooperate with the tooth frame structure at the same time, so that the tooth frame structure performs the cloth feeding work. When the sewing direction needs to be changed, the drive structure is adjusted to drive the first tooth frame shaft structure to rotate around the first tooth frame shaft by a predetermined angle, so that the sewing direction can be changed. The technical solution of this embodiment effectively solves the problem of time-consuming and labor-intensive adjustment in the prior art when the sewing direction changes.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0049] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A thread trimming assembly, characterized in that: include: A driving structure (10); A transmission structure (20), wherein the transmission structure (20) is connected to the driving structure (10); A wire trimming structure (30), the wire trimming structure (30) comprising a first wire trimming arm (31) and a second wire trimming arm (32), the first wire trimming arm (31) and the second wire trimming arm (32) both being connected to the transmission structure (20), the first wire trimming arm (31) and the second wire trimming arm (32) having wire trimming positions close to each other, or the first wire trimming arm (31) and the second wire trimming arm (32) having wire trimming positions far away from each other.

2. The thread trimming assembly according to claim 1, characterized in that: The wire cutting assembly comprises a sleeve (40), and the wire cutting structure (30) further comprises a first sleeve ring (35) and a second sleeve ring (36), the first wire cutting arm (31) is connected to the first sleeve ring (35), and the second wire cutting arm (32) is connected to the second sleeve ring (36), and the first sleeve ring (35) and the second sleeve ring (36) are both rotatably sleeved on the circumferential outer side of the sleeve (40).

3. The thread trimming assembly according to claim 2, characterized in that: The thread cutting structure (30) further comprises a first driving arm (33) and a second driving arm (34); the first driving arm (33) is rotatably connected to the first sleeve ring (35) and the transmission structure (20); and the second driving arm (34) is rotatably connected to the second sleeve ring (36) and the transmission structure (20).

4. The thread trimming assembly according to claim 3, characterized in that: The outer wall of the first collar (35) has a first protrusion, the outer wall of the second collar (36) has a second protrusion, the first end of the first driving arm (33) is rotatably connected to the first protrusion, the second end of the first driving arm (33) is rotatably connected to the transmission structure (20), the first end of the second driving arm (34) is rotatably connected to the second protrusion, and the second end of the second driving arm (34) is rotatably connected to the transmission structure (20).

5. The thread trimming assembly according to claim 3, characterized in that: The transmission structure (20) comprises a driving gear (21), a driven gear (22), a transmission rod (23) and a connecting portion (24); the driving gear (21) is arranged at the output end of the driving structure (10); the driven gear (22) is arranged on the transmission rod (23); the driving gear (21) and the driven gear (22) are meshed with each other; the connecting portion (24) is arranged on the transmission rod (23); and the first driving arm (33) and the second driving arm (34) are both rotatably connected to the connecting portion (24).

6. The thread trimming assembly according to claim 5, characterized in that: The connecting portion (24) is a connecting rod, the transmission rod (23) is connected between the first end of the connecting rod and the second end of the connecting rod, the second end of the first driving arm (33) is rotatably connected to the first end of the connecting rod, and the second end of the second driving arm (34) is rotatably connected to the second end of the connecting rod.

7. The thread trimming assembly according to any one of claims 1 to 6, characterized in that: The first thread cutting arm (31) comprises a first arm body and a first knife body, and the second thread cutting arm (32) comprises a second arm body and a second knife body, the first knife body is detachably connected to the first arm body via a first fastener, and the second knife body is detachably connected to the second arm body via a second fastener.

8. A rotary hook mechanism, characterized in that: The rotary hook mechanism comprises a rotary hook shaft and a thread trimming assembly. The thread trimming assembly is the thread trimming assembly according to any one of claims 1 to 7. The thread trimming structure (30) of the thread trimming assembly is sleeved on the circumferential outer side of the rotary hook shaft.

9. A sewing machine, characterized in that: The sewing machine comprises a sewing machine body and a thread trimmer assembly arranged on the sewing machine body, and the thread trimmer assembly is the thread trimmer assembly according to any one of claims 1 to 7.

10. The sewing machine according to claim 9, characterized in that The sewing machine comprises a sewing machine body, a control component, a rotary hook component, a feed dog component and a thread trimmer component. The feed dog component and the thread trimmer component are both arranged on a rotary hook shaft of the rotary hook component. The control component is electrically connected to the rotary hook component, the feed dog component and the thread trimmer component.

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