Connecting rod driving device in sewing machine and sewing machine

Abstract

The utility model provides a connecting rod driving device in a sewing machine and the sewing machine, and belongs to the technical field of sewing machine equipment. The problems that in the prior art, power needed by an electromagnet is large, and the torque transmission process is tortuous are solved. According to the connecting rod driving device in the sewing machine, the sewing machine comprises a machine shell, the connecting rod driving device comprises a power source arranged on the outer side of the machine shell, a swing arm capable of driving a presser foot to lift is arranged in the machine shell, the power source is connected with a swing rod, and the swing rod is hinged to the machine shell. A connecting rod assembly capable of driving the swing arm to swing when the power source drives the swing rod to swing is arranged between the swing rod and the swing arm. According to the utility model, the torque transmission efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machine equipment and relates to a connecting rod driving device in a sewing machine and the sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more threads and needles to sew materials together, or sew decorative lines on materials. It can sew fabrics such as cotton, wool, linen, silk, chemical fibers, and products such as leather, plastic, and paper. It is used in households, industries, and services. Currently, sewing machines on the market have the basic functions of lifting the presser foot and trimming the thread, and most of them use stepper motors or electromagnets to automatically lift the presser foot and trim the thread.

[0003] Application No. 202122434240.0 discloses a connecting rod driving structure in a sewing machine, including a casing, the connecting rod driving structure including a rocker arm, a driving member connected to the upper end of the rocker arm, and a presser foot lifting lever that can swing; a lifting and pressing assembly is installed on the presser foot lifting lever, the middle part of the rocker arm is hinged to the casing, the connecting rod driving structure also includes a connecting rod five, the upper end of the connecting rod five is hinged to the presser foot lifting lever, and the lower end of the connecting rod five is hinged to the middle part of the rocker arm.

[0004] The connecting rod driving structure in the above document is driven by an electromagnet and transmits power through the connecting rod five. It is convenient to use the electromagnet to automatically control the presser foot lifting. However, there are still some shortcomings. The power required by the electromagnet is large and the torque transmission process is tortuous. Summary of the invention

[0005] The utility model aims at the above problems existing in the prior art and provides a connecting rod driving device in a sewing machine and a sewing machine. The technical problem to be solved by the utility model is how to increase the torque transmission efficiency.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A connecting rod driving device in a sewing machine, the sewing machine includes a casing, the connecting rod driving device includes a power source arranged on the outside of the casing, a swing arm capable of driving the presser foot to lift is provided in the casing, and the character is that the power source is connected to a rocker rod, the rocker rod is hinged on the casing, and a connecting rod assembly is provided between the rocker rod and the swing arm, which can drive the swing arm to swing when the power source drives the rocker rod to swing.

[0008] Its working principle is as follows: the power source drives the swing arm to swing, and the swing of the swing arm causes the swing arm to swing through the transmission of the connecting rod assembly, so that the presser foot is lifted. The swing arm is hinged on the casing so that the swing arm can swing, which is convenient for driving the swing arm to swing through the power source and is only transmitted through the connecting rod assembly. The transmission path of the intermediate torque is short and convenient for docking, thereby improving the efficiency of torque transmission.

[0009] In the above-mentioned connecting rod driving device in a sewing machine, the rocker arm has a connecting end one and a connecting end two, the middle part of the rocker arm is hinged on the casing, the connecting end one and the connecting end two are respectively located at the two ends of the rocker arm, the connecting end one is connected to the power source, and the connecting end two is hinged or fixedly connected to the connecting rod assembly.

[0010] The rocker arm has a connection end one and a connection end two. The connection end one is used to connect to a power source to facilitate the power source to drive the rocker arm to swing. The connection end two is hinged or fixedly connected to the connecting rod assembly. The middle part of the rocker arm is hinged to the casing so that the connection end one and the connection end two can swing. The connection end one and the connection end two are located at both ends, which increases the stability of the transmission.

[0011] In the connecting rod driving device in the above-mentioned sewing machine, a fixing block is provided on the outer side of the casing, and a fixing rod is provided on the fixing block. The fixing rod and the fixing block are integrally formed, and one end of the fixing rod is hinged to the middle part of the rocker arm.

[0012] The fixed block is located outside the casing for easy installation and positioning. One end of the fixed rod is hinged to the middle part of the rocker arm, which enables the rocker arm to complete the swinging motion and makes it less likely to shake during the swinging process, further improving the transmission stability. They are all located outside the casing, which improves the efficiency of torque transmission.

[0013] In the above-mentioned connecting rod driving device in a sewing machine, the rocker arm is divided into a vertical part one and a vertical part two, one end of the vertical part one is hinged or fixedly connected to the connecting rod assembly, one end of the vertical part two is connected to the power source, the vertical part one and the vertical part two are integrally formed, and the angle formed by the vertical part one and the vertical part two is greater than or equal to 90 degrees.

[0014] One end of the vertical part one is hinged or fixedly connected to the connecting rod assembly, which can facilitate the movement of the connecting rod assembly. One end of the vertical part two is connected to the power source, which is convenient for the swing of the vertical part two and the vertical part one. The vertical part one and the vertical part two are integrally formed, and the two together form a rocker arm. The angle between the vertical part one and the vertical part two is greater than or equal to 90 degrees, which is convenient for the swing of the rocker arm. When the vertical part one is driven by the power source, the vertical part two can swing successively, the torque it is subjected to is short, the connection with the connecting rod assembly is more stable, and the efficiency of torque transmission is increased.

[0015] In the above-mentioned connecting rod driving device in a sewing machine, the power source includes a motor, the motor has an output shaft, the output shaft is connected to a cam, and the outer periphery of the cam is connected to the rocker arm.

[0016] The motor drives the cam to rotate through the output shaft. The outer periphery of the cam is connected to the rocker arm. The rotation of the cam can drive the rocker arm to swing. The structure is simple, the transmission efficiency is improved, and the transmission accuracy is high.

[0017] In the connecting rod driving device in the above-mentioned sewing machine, a fixing seat is connected to the outside of the casing, the fixing seat is fixedly connected to the casing, a fixing plate is extended outward from the fixing seat, the fixing plate is connected to the motor, a mounting hole is opened on the fixing plate, and the output shaft is connected to the cam through the mounting hole.

[0018] The fixing seat plays the role of fixing and connecting the casing, and the fixing plate extends from the fixing seat. The two are stably connected, so that the motor is stably located outside the casing. The mounting holes on the fixing plate can connect the output shaft on the motor with the cam, so that the transmission is stable.

[0019] In the connecting rod driving device in the above-mentioned sewing machine, the rocker arm has a positioning shaft 1, the positioning shaft 1 is located on the connecting end 1, and the outer periphery of the positioning shaft 1 has a roller 1, and the roller 1 can roll on the outer periphery of the cam.

[0020] The positioning shaft 1 is located on the connecting end 1 and plays a positioning role, which is convenient for connecting with the cam. The rotation of the cam causes the rocker arm to swing, and the roller 1 can move on the outer periphery of the cam. The roller 1 makes the rocker arm swing more efficiently on the outer periphery of the cam, thereby reducing friction and improving the efficiency of torque transmission.

[0021] As another solution, the cam is provided with a second positioning shaft, the second positioning shaft is located at one end of the cam, and a second roller is provided on the outer periphery of the second positioning shaft.

[0022] The second positioning shaft is located at one end of the cam and plays a positioning role, which is convenient for connection with the rocker rod. The second roller can make the cam rotate more smoothly and have a longer practical life.

[0023] In the above-mentioned connecting rod driving device in a sewing machine, the connecting rod assembly includes a connecting rod 1 hinged to the rocker arm, the connecting rod 1 is hinged to the connecting rod 2, the middle part of the connecting rod 2 is hinged to the connecting rod 3, the connecting rod 3 is hinged on the swing arm, and the middle part of the connecting rod 2 is hinged to the casing.

[0024] After the motor drives the cam to rotate, it drives the rocker arm to swing, the rocker arm drives the connecting rod one to swing, the swing of the connecting rod one drives the connecting rod two to swing, the connecting rod two drives the connecting rod three to swing, and the middle part of the connecting rod two is hinged on the casing, so that the connecting rod two and the connecting rod one can swing, and the connecting rod two and the connecting rod three can swing in phase. The transmission between the connecting rods is stable, the transmission path of the intermediate torque is short, and it is easy to connect, thereby improving the efficiency of torque transmission.

[0025] In the connecting rod driving device in the above-mentioned sewing machine, a positioning shaft three is hinged between the swing arm and the casing, the positioning shaft three is located in the middle of the swing arm, the swing arm can swing up and down relative to the positioning shaft three, and the left end of the swing arm is connected to the connecting rod three.

[0026] The positioning shaft three is fixed in the casing and is located in the middle of the swing arm, so that the left and right ends of the swing arm can swing up and down in opposite motion paths. The left end of the swing arm is connected to the connecting rod three. When the connecting rod three swings to the left, the left end of the swing arm swings downward and the right end of the swing arm swings upward, driving the presser foot to lift upward. The positioning shaft three plays a positioning role, making the swing arm easier to swing and ensuring the accuracy of transmission.

[0027] Another object of the present utility model is to provide a sewing machine, which comprises any one of the above-mentioned connecting rod driving devices.

[0028] Compared with the prior art, the advantages of the utility model are as follows:

[0029] 1. The power source drives the swing rod to swing, and the swing of the swing rod causes the swing arm to swing through the transmission of the connecting rod assembly, so that the presser foot is lifted. The swing rod is hinged on the casing so that the swing rod can swing, which is convenient for driving the swing rod to swing through the power source. The transmission is only through the connecting rod assembly, the transmission path of the intermediate torque is short, and it is easy to connect, thereby improving the efficiency of torque transmission.

[0030] 2. The swing rod has a connection end 1 and a connection end 2. The connection end 1 is used to connect to the power source to facilitate the power source to drive the swing rod to swing. The connection end 2 is hinged or fixedly connected to the connecting rod assembly. The middle part of the swing rod is hinged on the casing so that the connection end 1 and the connection end 2 can swing. The connection end 1 and the connection end 2 are located at both ends, which increases the stability of the transmission.

[0031] 3. The included angle between the vertical part 1 and the vertical part 2 is greater than or equal to 90 degrees, which facilitates the swing of the swing arm. When the vertical part 1 is driven by a power source, the vertical part 2 can swing successively, the torque received is short, the connection with the connecting rod assembly is more stable, and the efficiency of torque transmission is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the connecting rod driving device in this sewing machine.

[0033] Figure 2 It is a schematic diagram of the structure of the connecting rod driving device in this sewing machine.

[0034] Figure 3 It is a schematic diagram of the connecting rod structure in this sewing machine.

[0035] In the figure, 1 is a housing; 2 is a power source; 3 is a swing arm; 4 is a swing rod; 5 is a connecting rod assembly; 6 is a connecting end one; 7 is a connecting end two; 8 is a fixing block; 9 is a fixing rod; 10 is a vertical part one; 11 is a vertical part two; 12 is a motor; 13 is an output shaft; 14 is a cam; 15 is a fixing seat; 16 is a fixing plate; 17 is a mounting hole; 18 is a positioning shaft one; 19 is a roller one; 20 is a positioning shaft two; 21 is a roller two; 22 is a connecting rod one; 23 is a connecting rod two; 24 is a connecting rod three; 25 is a positioning shaft three. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0037] Embodiment 1

[0038] like Figure 1 and 2 As shown, the sewing machine includes a housing 1, a connecting rod driving device includes a power source 2 arranged on the outer side of the housing 1, a swing arm 3 capable of driving the presser foot to lift is arranged in the housing 1, the power source 2 is connected to a swing rod 4, the swing rod 4 is hinged on the housing 1, and a connecting rod assembly 5 is provided between the swing rod 4 and the swing arm 3, which can drive the swing arm 3 to swing when the power source 2 drives the swing rod 4 to swing. The power source 2 drives the swing rod 4 to swing, and the swing of the swing rod 4 causes the swing arm 3 to swing through the transmission of the connecting rod assembly 5, so that the presser foot is lifted, and the swing rod 4 is hinged on the housing 1, so that the swing rod 4 can swing, which is convenient for driving the swing rod 4 to swing through the power source 2, and the transmission is only through the connecting rod assembly 5, the transmission path of the intermediate torque is short, and it is convenient to dock, thereby improving the efficiency of torque transmission.

[0039] like Figure 1 and 2 As shown, the swing rod 4 has a connection end 1 6 and a connection end 2 7, the middle part of the swing rod 4 is hinged on the housing 1, the connection end 1 6 and the connection end 2 7 are respectively located at the two ends of the swing rod 4, the connection end 1 6 is connected to the power source 2, and the connection end 2 7 is hinged or fixedly connected to the connecting rod assembly 5. The swing rod 4 has a connection end 1 6 and a connection end 2 7, the connection end 1 6 is used to connect to the power source 2, so that the power source 2 drives the swing rod 4 to swing, the connection end 2 7 is hinged or fixedly connected to the connecting rod assembly 5, the middle part of the swing rod 4 is hinged on the housing 1, so that the connection end 1 6 and the connection end 2 7 can swing, and the connection end 1 6 and the connection end 2 7 are located at both ends, which increases the stability of the transmission.

[0040] like Figure 1 and 2 As shown, a fixing block 8 is provided on the outside of the housing 1, and a fixing rod 9 is provided on the fixing block 8. The fixing rod 9 and the fixing block 8 are integrally formed, and one end of the fixing rod 9 is hinged to the middle of the swing rod 4. The fixing block 8 is located outside the housing 1, which is convenient for installation and positioning. One end of the fixing rod 9 is hinged to the middle of the swing rod 4, which can enable the swing rod 4 to complete the swinging motion, so that the swing rod 4 is not easy to shake during the swinging process, and the transmission stability is further improved. They are all located outside the housing 1, which improves the efficiency of torque transmission.

[0041] like Figure 3As shown, the rocker arm 4 is divided into a vertical portion 10 and a vertical portion 2 11, one end of the vertical portion 10 is hinged or fixedly connected to the connecting rod assembly 5, one end of the vertical portion 2 11 is connected to the power source 2, the vertical portion 10 and the vertical portion 2 11 are integrally formed, and the angle formed by the vertical portion 10 and the vertical portion 2 11 is greater than or equal to 90 degrees. One end of the vertical part 10 is hinged or fixedly connected to the connecting rod assembly 5, which can facilitate the movement of the connecting rod assembly 5. One end of the vertical part 2 11 is connected to the power source 2, which is convenient for the swing of the vertical part 2 11 and the vertical part 10. The vertical part 10 and the vertical part 2 11 are integrally formed, and the two together form a rocker arm 4. The angle between the vertical part 10 and the vertical part 2 11 is greater than or equal to 90 degrees, which is convenient for the swing of the rocker arm 4. When the vertical part 10 is driven by the power source 2, the vertical part 2 11 can swing successively, the torque it is subjected to is short, the connection with the connecting rod assembly 5 is more stable, and the efficiency of torque transmission is increased.

[0042] like Figure 1 and 2 As shown, the power source 2 includes a motor 12, the motor 12 has an output shaft 13, the output shaft 13 is connected to a cam 14, and the outer periphery of the cam 14 is connected to the swing rod 4. The motor 12 drives the cam 14 to rotate through the output shaft 13, and the outer periphery of the cam 14 is connected to the swing rod 4. The rotation of the cam 14 can drive the swing rod 4 to swing, the structure is simple, the transmission efficiency is improved, and the transmission accuracy is high.

[0043] like Figure 1 and 2 As shown, a fixing seat 15 is connected to the outer side of the housing 1, and the fixing seat 15 is fixedly connected to the housing 1. A fixing plate 16 extends outward from the fixing seat 15, and the fixing plate 16 is connected to the motor 12. A mounting hole 17 is provided on the fixing plate 16, and the output shaft 13 passes through the mounting hole 17 and is connected to the cam 14. The fixing seat 15 plays a role in fixing the housing 1, and the fixing plate 16 extends out from the fixing seat 15. The two are stably connected, so that the motor 12 is stably located outside the housing 1, and the mounting hole 17 on the fixing plate 16 can connect the output shaft 13 on the motor 12 with the cam 14, so that the transmission is stable.

[0044] like Figure 1 and 2 As shown, the swing rod 4 has a positioning shaft 18, which is located on the connection end 6, and a roller 19 is provided on the outer periphery of the positioning shaft 18, and the roller 19 can roll on the outer periphery of the cam 14. The positioning shaft 18 is located on the connection end 6, and plays a positioning role, which is convenient for connection with the cam 14. The cam 14 rotates to make the swing rod 4 swing, and the roller 19 can move on the outer periphery of the cam 14. The roller 19 makes the swing rod 4 swing more efficiently on the outer periphery of the cam 14, reduces friction, and improves the efficiency of torque transmission.

[0045] like Figure 3 As shown, the connecting rod assembly 5 includes a connecting rod 1 22 hinged with the swing rod 4, the connecting rod 1 22 is hinged with the connecting rod 2 23, the middle part of the connecting rod 2 23 is hinged with the connecting rod 3 24, the connecting rod 3 24 is hinged on the swing arm 3, and the middle part of the connecting rod 2 23 is hinged on the housing 1. After the motor 12 drives the cam 14 to rotate, it drives the swing rod 4 to swing, the swing rod 4 drives the connecting rod 1 22 to swing, the swing of the connecting rod 1 22 drives the connecting rod 2 23 to swing, the connecting rod 2 23 drives the connecting rod 3 24 to swing, and the middle part of the connecting rod 2 23 is hinged on the housing 1, so that the connecting rod 2 23 can swing with the connecting rod 1 22, and the connecting rod 2 23 can swing with the connecting rod 3 24. The transmission between the connecting rods is stable, the transmission path of the intermediate torque is short, and it is easy to dock, which improves the efficiency of torque transmission.

[0046] like Figure 3 As shown, a positioning shaft 3 25 is hinged between the swing arm 3 and the housing 1, and the positioning shaft 3 25 is located in the middle of the swing arm 3. The swing arm 3 can swing up and down relative to the positioning shaft 3 25, and the left end of the swing arm 3 is connected to a connecting rod 3 24. The positioning shaft 3 25 is fixed in the housing 1 and located in the middle of the swing arm 3, so that the left and right ends of the swing arm 3 can swing up and down in opposite motion paths. The left end of the swing arm 3 is connected to the connecting rod 3 24. When the connecting rod 3 24 swings to the left, the left end of the swing arm 3 swings downward, and the right end of the swing arm 3 swings upward, driving the presser foot to lift upward. The positioning shaft 3 25 plays a positioning role, making the swing arm 3 easier to swing and ensuring the accuracy of the transmission.

[0047] Embodiment 2

[0048] like Figure 1 and 2 The present embodiment shown is roughly the same as the embodiment 1, except that: the cam 14 is provided with a second positioning shaft 20, the second positioning shaft 20 is located at one end of the cam 14, and a second roller 21 is provided on the outer periphery of the second positioning shaft 20. The second positioning shaft 20 is located at one end of the cam 14, plays a positioning role, and is convenient for connecting with the swing rod 4. The second roller 21 can make the cam 14 rotate more smoothly and have a longer practical life.

[0049] Embodiment 3

[0050] The general contents of this embodiment are the same as those of the embodiment 1, except that: a sewing machine is provided, which includes any one of the connecting rod driving devices in the embodiment 1.

[0051] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A connecting rod driving device in a sewing machine, the sewing machine comprising a housing (1), the connecting rod driving device comprising a power source (2) arranged on the outer side of the housing (1), a swing arm (3) capable of driving a presser foot to lift is arranged in the housing (1), characterized in that: The power source (2) is connected to a swing rod (4), the swing rod (4) is hinged on the housing (1), and a connecting rod assembly (5) is provided between the swing rod (4) and the swing arm (3), which can drive the swing arm (3) to swing when the power source (2) drives the swing rod (4) to swing.

2. A connecting rod driving device in a sewing machine according to claim 1, characterized in that: The swing rod (4) is provided with a connection end 1 (6) and a connection end 2 (7), the middle part of the swing rod (4) is hinged on the housing (1), the connection end 1 (6) and the connection end 2 (7) are respectively located at two ends of the swing rod (4), the connection end 1 (6) is connected to the power source (2), and the connection end 2 (7) is hinged or fixedly connected to the connecting rod assembly (5).

3. A connecting rod driving device in a sewing machine according to claim 1 or 2, characterized in that: A fixing block (8) is provided on the outer side of the housing (1), and a fixing rod (9) is provided on the fixing block (8). The fixing rod (9) and the fixing block (8) are integrally formed, and one end of the fixing rod (9) is hinged to the middle part of the swing rod (4).

4. A connecting rod driving device in a sewing machine according to claim 1, characterized in that: The swing arm (4) is divided into a vertical portion 1 (10) and a vertical portion 2 (11), one end of the vertical portion 1 (10) is hinged or fixedly connected to the connecting rod assembly (5), one end of the vertical portion 2 (11) is connected to the power source (2), the vertical portion 1 (10) and the vertical portion 2 (11) are integrally formed, and the angle formed by the vertical portion 1 (10) and the vertical portion 2 (11) is greater than or equal to 90 degrees.

5. A connecting rod driving device in a sewing machine according to claim 2, characterized in that: The power source (2) comprises a motor (12), the motor (12) has an output shaft (13), the output shaft (13) is connected to a cam (14), and the outer periphery of the cam (14) is connected to the rocker (4).

6. A connecting rod driving device according to claim 5, characterized in that: A fixing seat (15) is connected to the outer side of the housing (1), the fixing seat (15) is fixedly connected to the housing (1), a fixing plate (16) is extended outward from the fixing seat (15), the fixing plate (16) is connected to the motor (12), a mounting hole (17) is provided on the fixing plate (16), and the output shaft (13) passes through the mounting hole (17) and is connected to the cam (14).

7. A connecting rod driving device according to claim 5, characterized in that: The rocker arm (4) is provided with a positioning shaft (18), the positioning shaft (18) is located on the connecting end (6), and the outer periphery of the positioning shaft (18) is provided with a roller (19), and the roller (19) can roll on the outer periphery of the cam (14).

8. The connecting rod driving device according to claim 5, characterized in that: The cam (14) is provided with a second positioning shaft (20), the second positioning shaft (20) is located at one end of the cam (14), and a second roller (21) is provided on the outer periphery of the second positioning shaft (20).

9. The connecting rod driving device according to claim 1, characterized in that: The connecting rod assembly (5) comprises a connecting rod 1 (22) hinged to the swing rod (4), the connecting rod 1 (22) being hinged to a connecting rod 2 (23), a connecting rod 3 (24) being hinged to the middle part of the connecting rod 2 (23), the connecting rod 3 (24) being hinged to the swing arm (3), the middle part of the connecting rod 2 (23) being hinged to the housing (1), a positioning shaft 3 (25) being hinged between the swing arm (3) and the housing (1), the positioning shaft 3 (25) being located in the middle part of the swing arm (3), the swing arm (3) being able to swing up and down relative to the positioning shaft 3 (25), and the left end of the swing arm (3) being connected to the connecting rod 3 (24).

10. A sewing machine, characterized in that: The sewing machine comprises the connecting rod driving device according to any one of claims 1-9.

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