Thread separating device and sewing machine

Abstract

The utility model discloses a thread separating device and a sewing machine, the thread separating device comprises a rotating shuttle assembly, a driving shaft used for driving the rotating shuttle assembly to rotate, and a thread separating hook, the driving shaft extends along a first direction and can be rotatably arranged on a mounting rack around the axis of the driving shaft; the branching hook comprises a transmission rod and a hook body fixedly arranged at one end of the transmission rod, the transmission rod extends in a second direction perpendicular to the first direction, and the transmission rod can be rotationally arranged on the mounting frame around the axis of the transmission rod, so that the hook body can swing in a reciprocating manner; a linkage mechanism is arranged between the driving shaft and the branching hook, the linkage mechanism comprises a cam fixedly arranged on the driving shaft and a linkage piece fixedly arranged on the branching hook, a fluctuating driving curved surface is arranged on one side of the cam in the first direction, and the linkage piece abuts against the driving curved surface all the time; the linkage mechanism is simple in structure and saves cost.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a thread separating device and a sewing machine. Background Art

[0002] The thread separating device includes a thread separating hook, which is an important part of a sewing machine. Through the cooperation with the rotary hook, the rotary hook completes the operation of taking out the thread and tying and locking the seam with the coil. In the prior art, most thread separating devices have complex structures and many parts, making the installation of the thread separating device complex and the replacement of parts cumbersome, increasing the production cost of the sewing machine and also increasing the maintenance cost of the sewing machine. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a new thread separating device.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a thread separating device, comprising:

[0005] A rotary hook assembly rotatably arranged on the mounting bracket around a rotation center line;

[0006] A driving shaft for driving the rotary hook assembly to rotate, the driving shaft extends along a first direction, and the driving shaft is rotatably arranged on the mounting bracket around its own axis;

[0007] A thread separating hook, including a transmission rod and a hook body fixed at one end of the transmission rod, the transmission rod extends along a second direction, the second direction is perpendicular to the first direction, and the second direction is parallel to the extension direction of the rotation center line, the transmission rod is rotatably arranged on the mounting bracket around its own axis, so that the hook body can swing reciprocally;

[0008] A linkage mechanism is arranged between the driving shaft and the thread separating hook, the linkage mechanism includes a cam fixed on the driving shaft and a linkage member fixed on the thread separating hook. Along the first direction, one side of the cam is provided with a driving surface with undulations; the linkage member has a first end portion and a second end portion arranged at different ends, the first end portion and the second end portion are arranged on different sides of the thread separating hook, and the first end portion always abuts against the driving surface;

[0009] The linkage mechanism further includes a pushing assembly, the pushing assembly abuts against the second end portion, and the pushing assembly is used to drive the linkage member to rotate, so that the first end portion approaches the driving surface.

[0010] In some embodiments, the pushing component includes a pushing block and an elastic member. The pushing block abuts against the second end portion, and the pushing block is arranged to be movable in a third direction, which is parallel to the first direction. The elastic member is used to provide the acting force required for the pushing block to move towards the second end portion.

[0011] In some embodiments, an installation cavity extending in the third direction is provided on the mounting bracket. The pushing component further includes a gasket and a snap ring. The pushing block, the elastic member, the gasket and the snap ring are sequentially arranged in the installation cavity along the third direction, and the snap ring is fixedly arranged on a side of the installation cavity away from the second end portion.

[0012] In some embodiments, the elastic member is a sponge.

[0013] In some embodiments, a abutting member is provided on the linkage member, and an installation groove is provided at the first end portion. The abutting member is detachably arranged in the installation groove, and the abutting member always abuts against the driving curved surface.

[0014] In some embodiments, the cam is annular and sleeved on the driving shaft. Along the first direction, the cam has a first side portion and a second side portion disposed on different sides. The first side portion has a first abutting position closest to the second side portion along the first direction, and a second abutting position farthest from the second side portion along the first direction. The first abutting position and the second abutting position are spaced apart along the circumferential direction of the driving shaft, and the first abutting position and the second abutting position are connected by a smooth curved surface. The surface of the first side portion constitutes the driving curved surface.

[0015] In some embodiments, the rotating shuttle assembly includes a rotating shuttle. A wire passing opening is formed between the rotating shuttle and the hook body. When the first end portion abuts against the first abutting position, the hook body moves closer to the rotating shuttle, and the wire passing opening is closed; when the first end portion abuts against the second abutting position, the hook body moves away from the rotating shuttle, and the wire passing opening is opened.

[0016] In some embodiments, the rotating shuttle assembly includes a rotating shuttle shaft and a rotating shuttle fixedly arranged at one end of the rotating shuttle shaft. The axis line of the rotating shuttle shaft extends collinearly with the rotation center line. A conical first gear is fixedly arranged on the rotating shuttle shaft, and a conical second gear is fixedly arranged on the driving shaft. The first gear meshes with the second gear.

[0017] In some embodiments, a plurality of oil-impregnated bushings are fixedly arranged on the mounting bracket. The plurality of oil-impregnated bushings are spaced apart along the second direction, and the wire separating hook is axially inserted into the plurality of oil-impregnated bushings.

[0018] Another object of the present utility model is to provide a sewing machine.

[0019] To achieve the above object, the technical solution adopted by the present utility model is: a sewing machine, including the above-mentioned thread dividing device.

[0020] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art: the thread dividing device of the present utility model realizes the linkage between the drive shaft and the thread dividing hook through the cam and the linkage member. When the drive shaft rotates, it drives the cam to rotate together. Under the action of the pushing component, the linkage member is always in contact with the driving curved surface of the cam. Driven by the driving curved surface, the linkage member swings reciprocally. The linkage member transmits the movement to the hook body through the transmission rod, so that the hook body swings reciprocally. The linkage mechanism has a simple structure, simplifies the structure of the thread dividing device and the sewing machine, is convenient for installation and maintenance, and saves costs at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 is a three-dimensional structural schematic diagram of the rotating hook device of a specific embodiment of the present utility model;

[0022] Attached Figure 2 is the enlarged schematic diagram at A in the attached Figure 1 ;

[0023] Attached Figure 3 is the three-dimensional schematic diagram after removing the rotating hook in the attached Figure 1 ;

[0024] Attached Figure 4 is the three-dimensional schematic diagram after removing the mounting bracket in the attached Figure 1 ;

[0025] Attached Figure 5 is the side view of the attached Figure 1 ;

[0026] Attached Figure 6 is the cross-sectional schematic diagram taken along the B-B direction in the attached Figure 5 ;

[0027] Attached Figure 7 is the cross-sectional schematic diagram taken along the C-C direction in the attached Figure 5 ;

[0028] Attached Figure 8 is the partial structural decomposition schematic diagram of the attached Figure 3 ;

[0029] Attached Figure 9 is the three-dimensional structural schematic diagram of a sewing machine of a specific embodiment of the present utility model;

[0030] Attached Figure 10 is the enlarged schematic diagram at D in the attached Figure 9 ;

[0031] Among them: 100, wire dividing device; 1, rotating shuttle assembly; 11, rotating shuttle; 111, shuttle case; 112, shuttle bobbin; 1121, protrusion; 12, rotating shuttle shaft; 121, first gear;

[0032] 2, mounting bracket; 21, mounting cavity; 22, oil-impregnated bushing;

[0033] 3, drive shaft; 31, second gear;

[0034] 4, wire dividing hook; 41, hook body; 42, transmission rod; 421, first rod section; 422, second rod section; 423, avoidance groove; 43, fixing ring;

[0035] 5, cam; 51, driving surface;

[0036] 6, linkage; 61, first end; 62, second end; 63, abutting member; 64, mounting groove;

[0037] 7, pushing component; 71, top block; 72, elastic member; 73, gasket; 74, circlip. Specific embodiments

[0038] The technical solutions of the present utility model will be elaborated in detail below in conjunction with the accompanying drawings and specific embodiments, so that the advantages and features of the present utility model are more easily understood by those skilled in the art. Obviously, the described embodiments of the present application are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art without creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0039] See Figure 9 , Figure 10 As shown in a sewing machine, including a wire dividing device 100, see Figure 1 As shown, the wire dividing device 100 includes a rotating shuttle assembly 1, a mounting bracket 2, a drive shaft 3 and a wire dividing hook 4. Among them, the rotating shuttle assembly 1 is rotatably arranged on the mounting bracket 2 around the rotation center line X1. The drive shaft 3 is used to drive the rotating shuttle assembly 1 to rotate. The drive shaft 3 extends along the first direction, and the drive shaft 3 is rotatably arranged on the mounting bracket 2 around its own axis. The wire dividing hook 4 includes a transmission rod 42 and a hook body 41 fixed at one end of the transmission rod 42. The transmission rod 42 extends along the second direction. The second direction is perpendicular to the first direction, and the second direction is parallel to the extension direction of the rotation center line X1. The transmission rod 42 is rotatably arranged on the mounting bracket 2 around its own axis, so that the hook body 41 can swing reciprocally.

[0040] A linkage mechanism is provided between the driving shaft 3 and the wire-dividing hook 4, which is used to enable the wire-dividing hook to swing when the driving shaft 3 rotates. The linkage mechanism includes a cam 5 fixed on the driving shaft 3 and a linkage member 6 fixed on the wire-dividing hook 4. Along the first direction, one side of the cam 5 is provided with a driving curved surface 51 with undulations, and the linkage member 6 always abuts against the driving curved surface 51. During the rotation of the driving shaft 3, the cam 5 rotates together with the driving shaft 3. Affected by the driving curved surface 51, the linkage member 6 is driven to move along the first direction, thereby driving the transmission rod 42 to rotate around its own axis. Since the driving curved surface 51 has ups and downs, during the rotation of the cam 5, the linkage member 6 abutting against it will reciprocate along the first direction, thereby driving the hook body 41 to swing back and forth through the transmission rod 42. The linkage mechanism has a simple and stable structure.

[0041] In this embodiment, the linkage member 6 has a first end 61 and a second end 62 disposed at two different ends. The first end 61 and the second end 62 are disposed at two different sides of the line dividing hook 4. The first end 61 always abuts against the driving curved surface 51. The linkage mechanism also includes a push assembly 7. The push assembly 7 and the second end 62 abut against each other. The push assembly 7 is used to drive the linkage member 6 to rotate so that the first end 61 moves closer to the driving curved surface 51. Under the action of the push assembly 7, the first end 61 of the linkage member 6 can always abut against the driving curved surface 51, and the push assembly 7 acts on the second end 62 away from the cam 5. Compared with directly acting on the first end 61, its action is more stable and can avoid being disturbed.

[0042] In this embodiment, the push assembly 7 includes a push block 71 and an elastic member 72. The push block 71 can be arranged to move along a third direction, which is parallel to the first direction. The push block 71 abuts against the second end 62, and the elastic member 72 is used to provide the force required for the push block to move toward the second end 62. During the rotation of the cam 5, the push block 71 reciprocates along the third direction. Driven by the elastic member 72, the push block 71 always abuts against the second end 62, so that the first end 61 always abuts against the driving curved surface 51.

[0043] In this embodiment, see Figure 7 As shown, the mounting frame 2 is provided with a mounting cavity 21 extending along the third direction, and the push assembly 7 further includes a gasket 73 and a retaining spring 74. The top block 71, the elastic member 72, the gasket 73 and the retaining spring 74 are sequentially arranged in the mounting cavity along the third direction. The mounting cavity 21 provides a guide for the movement of the top block 71, thereby improving the stability of the linkage mechanism. In this embodiment, the retaining spring 74 is fixedly arranged on the side of the mounting cavity 21 away from the second end 62, and the retaining spring 74 limits the displacement of the gasket 73 along the third direction, and the two ends of the elastic member 72 respectively abut against the gasket 73 and the top block 71. By replacing the gasket 73 or adjusting the position of the retaining spring 74, the magnitude of the force exerted by the elastic member 72 on the top block 71 can be changed.

[0044] In this embodiment, the elastic member 72 is a sponge. After being compressed, the force of the sponge to restore its original shape can drive the top block 71 to move towards the second end portion 62, and the sponge has good durability. In other embodiments, the elastic member 72 is a spring or other members capable of elastic deformation in the prior art such as a spring.

[0045] In this embodiment, the linkage member 6 is fixed to the transmission rod 42 by screws, which is convenient for installation. And by loosening the screws, the linkage member 6 can be driven to move relative to the transmission rod 42 in the second direction, so that the position of the linkage member 6 can be adjusted, and it can also rotate around the linkage member 6 to adjust the relative positional relationship between the linkage member 6 and the hook body 41. After the position is adjusted accurately, tightening the screws can fix the linkage member 6. In this embodiment, the mounting bracket 2 is provided with an opening communicating with the mounting cavity 21, the second end portion 62 is located at the opening, the second end portion 62 can move relatively away from or close to the opening, and the top block 71 can extend out of the opening and abut against the second end portion 62.

[0046] In this embodiment, the linkage member 6 is provided with an abutting member 63, and the abutting member 63 always abuts against the driving curved surface 51. The abutting member 63 is made of wear-resistant material to ensure that it will not be severely worn after long-term frictional contact with the cam 5. In this embodiment, the first end portion 61 is provided with a mounting groove 64, and the abutting member 63 is detachably arranged in the mounting groove 64. In this way, after long-term use, the abutting member 63 can be detached and replaced, without the need to replace the entire linkage member 6, which can effectively save costs.

[0047] In this embodiment, the cam 5 is annular and sleeved on the driving shaft 3. Along the first direction, the cam 5 has a first side portion and a second side portion disposed on different sides. The first side portion has a first abutting position where the distance from the second side portion is the smallest along the first direction, and a second abutting position where the distance from the second side portion is the largest along the first direction. The first abutting position and the second abutting position are circumferentially spaced along the driving shaft, and the first abutting position and the second abutting position are connected by a smooth curved surface, and the surface of the first side portion constitutes the driving curved surface.

[0048] In this embodiment, the bobbin case assembly 1 includes a bobbin case 11 and a bobbin shaft 12. The axis line of the bobbin shaft 12 extends collinearly with the rotation center line X1, and the bobbin shaft 12 is rotatably arranged on the mounting bracket 2 around its own axis line, and the bobbin case 11 is fixed to one end of the bobbin shaft 12. A wire passing opening is formed between the bobbin case 11 and the hook body 41. When the first end portion 61 abuts against the first abutting position, the hook body 41 moves closer to the bobbin case 11, and the wire passing opening is closed. See Figure 2As shown, when the first end portion 61 abuts against the second abutting position, the hook body 41 is away from the rotating shuttle 11 and the wire passing opening is opened. Specifically, the rotating shuttle 11 includes a shuttle shell 111 and a shuttle bobbin 112. The shuttle shell 111 is fixedly arranged at one end of the rotating shuttle shaft 12, and the shuttle bobbin 112 is movably arranged in the shuttle shell 111. Refer to Figure 2 As shown, a protruding projection 1121 is arranged on the shuttle bobbin 112, and a wire passing opening is formed between the hook body 41 and the projection 1121.

[0049] In this embodiment, the cam 5 is fixed on the drive shaft 3 by screws, which is convenient for installation. And when the screws are loosened, the cam 5 can rotate around the drive shaft 3, so as to adjust the angle of the cam 5 to control the wire separating time.

[0050] In this embodiment, refer to Figure 4 As shown, a conical first gear 121 is fixedly arranged on the rotating shuttle shaft 12, and a conical second gear 31 is fixedly arranged on the drive shaft 3. The first gear 121 and the second gear 31 are meshed with each other. During the rotation of the drive shaft 3, the cooperation between the first gear 121 and the second gear 31 can drive the rotating shuttle shaft 12 to rotate, so as to drive the rotating shuttle 11 to rotate. In this embodiment, refer to Figure 3 、 Figure 5 As shown, the rotating shuttle shaft 12 and the transmission rod 42 of the wire separating hook 4 both extend in the vertical direction, the drive shaft 3 extends in the horizontal direction, and the linkage 6 and the hook body 41 of the wire separating hook 4 also both extend in the horizontal direction. Driven by the cam 5, the linkage 6 swings in the horizontal plane and drives the hook body 41 to swing in the horizontal plane.

[0051] In this embodiment, a plurality of oil-impregnated bushings 22 are fixedly arranged on the mounting bracket 2. The plurality of oil-impregnated bushings 22 are arranged at intervals along the second direction. The wire separating hook 4 is axially inserted into the plurality of oil-impregnated bushings 22. Specifically, refer to Figure 6 、 Figure 8 As shown, in the up and down direction, two oil-impregnated bushings 22 are fixedly arranged on the mounting bracket 2. One oil-impregnated bushing 22 is fixedly arranged on the upper part of the mounting bracket 2, and the other is fixedly arranged on the lower part of the mounting bracket 2.

[0052] In this embodiment, the transmission rod 42 and the hook body 41 are integrally formed. The transmission rod 42 has a first rod section 421 and a second rod section 422. The first rod section 421 is fixedly arranged on the upper part of the second rod section 422, and the hook body 41 is fixedly arranged on the upper part of the first rod section 421. The rod diameter of the first rod section 421 is larger than that of the second rod section 422, so as to form a limiting surface between the first rod section 421 and the second rod section 422. This limiting surface abuts against the upper part of the oil-impregnated bushing 22, thus playing a limiting role on the wire separating hook 4. In this embodiment, to avoid interfering with the rotation of the rotating shuttle 11, an avoidance groove 423 is arranged on one side of the first rod section 421. Specifically, refer to the figure shown, the first rod section 421 is semi-cylindrical.

[0053] In this embodiment, a fixing ring 43 is sleeved on the lower part of the transmission rod 42. The fixing ring 43 is fixed to the transmission rod 42 by screws. Refer to Figure 6 , Figure 8 As shown, the fixing ring 43 is located below the oil-impregnated bushing 22. Driving the fixing ring 43 to move on the transmission rod 42 can adjust the gap between the fixing ring and the oil-impregnated bushing 22.

[0054] In summary, for the wire dividing device 100 of this embodiment, the linkage between the drive shaft 3 and the wire dividing hook 4 is realized through the cam 5 and the linkage member 6. When the drive shaft 3 rotates, the cam 5 will rotate together. Under the action of the pushing assembly 7, the linkage member 6 is always in contact with the driving surface 51 of the cam 5. Driven by the driving surface 51, the linkage member 6 swings reciprocally. The linkage member 6 transmits the motion to the hook body 41 through the transmission rod 42, so that the hook body 41 swings reciprocally. The linkage mechanism has a simple structure, simplifies the structure of the wire dividing device and the sewing machine, is convenient for installation and maintenance, and saves costs at the same time.

[0055] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A line splitting device, characterized in that: include: The rotary hook assembly is rotatably arranged on the mounting frame around a rotation center line; A driving shaft, used to drive the rotary hook assembly to rotate, the driving shaft extending along a first direction, and the driving shaft being rotatable around its own axis and arranged on the mounting frame; A line splitting hook, comprising a transmission rod and a hook body fixedly mounted at one end of the transmission rod, wherein the transmission rod extends along a second direction, the second direction is perpendicular to the first direction, and the second direction is parallel to the extending direction of the rotation center line, and the transmission rod is rotatably mounted on the mounting frame around its own axis, so that the hook body can swing back and forth; A linkage mechanism is provided between the driving shaft and the wire-dividing hook, the linkage mechanism comprising a cam fixedly arranged on the driving shaft and a linkage member fixedly arranged on the wire-dividing hook, and along the first direction, a side portion of the cam is provided with a driving curved surface with undulations; the linkage member has a first end portion and a second end portion which are respectively arranged at two different ends, the first end portion and the second end portion are arranged at two different sides of the wire-dividing hook, and the first end portion always abuts against the driving curved surface; The linkage mechanism further includes a pushing assembly, the pushing assembly abuts against the second end portion, and the pushing assembly is used to drive the linkage member to rotate so that the first end portion moves closer to the driving curved surface.

2. The line splitting device according to claim 1, characterized in that: The push assembly includes a push block and an elastic member, the push block abuts against the second end, the push block can be arranged to move along a third direction, the third direction is parallel to the first direction, and the elastic member is used to provide the force required for the push block to move toward the second end.

3. The line splitting device according to claim 2, characterized in that: The mounting frame is provided with a mounting cavity extending along the third direction, and the push assembly also includes a gasket and a retaining spring. The push block, the elastic member, the gasket and the retaining spring are sequentially arranged in the mounting cavity along the third direction, and the retaining spring is fixed on a side of the mounting cavity away from the second end.

4. The line splitting device according to claim 2, characterized in that: The elastic member is a sponge.

5. The line splitting device according to claim 1, characterized in that: The linkage member is provided with abutting member, the first end portion is provided with a mounting groove, the abutting member is detachably arranged in the mounting groove, and the abutting member always abuts against the driving curved surface.

6. The line splitting device according to claim 1, characterized in that: The cam is annular and is sleeved on the driving shaft. Along the first direction, the cam has a first side portion and a second side portion respectively arranged on two different sides. The first side portion has a first abutment position closest to the second side portion along the first direction, and a second abutment position farthest from the second side portion along the first direction. The first abutment position and the second abutment position are arranged at intervals along the circumference of the driving shaft, and the first abutment position and the second abutment position are connected by a smooth curved surface. The surface of the first side portion constitutes the driving curved surface.

7. The line splitting device according to claim 6, characterized in that: The rotary shuttle assembly includes a rotary shuttle, and a wiring opening is formed between the rotary shuttle and the hook body. When the first end abuts against the first abutting position, the hook body moves toward the rotary shuttle and the wiring opening is closed; when the first end abuts against the second abutting position, the hook body moves away from the rotary shuttle and the wiring opening is opened.

8. The line splitting device according to claim 1, characterized in that: The rotary hook assembly includes a rotary hook shaft and a rotary hook fixed at one end of the rotary hook shaft, the axis of the rotary hook shaft extends colinearly with the rotation center line, a first conical gear is fixed on the rotary hook shaft, and a second conical gear is fixed on the drive shaft, and the first gear and the second gear are meshed with each other.

9. The line splitting device according to claim 8, characterized in that: A plurality of oil-containing sleeves are fixedly arranged on the mounting frame, and the plurality of oil-containing sleeves are arranged at intervals along the second direction, and the line dividing hook is inserted into the plurality of oil-containing sleeves along its own axial direction.

10. A sewing machine, characterized in that: It comprises the line splitting device as claimed in any one of claims 1 to 9.

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