Trimming presser foot lifting mechanism of button sewing machine

Abstract

The utility model provides a trimming and presser foot lifting mechanism of a button sewing machine, which comprises a driving motor, a presser foot lifting driving block, a trimming driving block, a trimming blade and a button clamp block which are arranged in a machine shell, a driving cam is arranged on an output shaft of the driving motor, the presser foot lifting driving block and the trimming driving block both abut against the side face of the driving cam, and the button clamp block is arranged on the side face of the driving cam. When the driving motor drives the driving cam to rotate, the driving cam sequentially drives the thread trimming driving block and the presser foot lifting driving block to rotate, and the rotating thread trimming driving block and the rotating presser foot lifting driving block respectively drive the thread trimming blade and the button clamp block to sequentially rotate through linkage pieces. According to the trimming and presser foot lifting mechanism of the button sewing machine, the driving motor drives the driving cam to rotate, trimming and lifting are driven in a staggered mode, trimming is conducted firstly, then presser foot lifting is conducted, trimming thread ends are shorter, stitches are more attractive, the subsequent thread end trimming process does not need to be set, and therefore the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of button sewing machines and relates to a thread trimming and presser foot lifting mechanism of the button sewing machine. Background Art

[0002] When processing and producing clothing, shoes, hats, bags and other products, it is usually necessary to sew buttons. At present, button sewing machines are generally used to sew buttons.

[0003] The invention patent application with application publication number CN111048846A discloses a button sewing machine motor-driven lifting and pressing thread cutting mechanism, wherein the output shaft of the motor is connected to the lifting and pressing thread cutting drive rod through a transmission assembly, and the lifting and pressing thread cutting drive rod is hinged on a fixed rotating axial screw, one end of the lifting and pressing thread cutting drive rod is connected to the lifting and pressing assembly, and the other end is connected to the thread cutting assembly, and the motor is a bidirectional motor. When the motor shaft rotates in both directions, the lifting and pressing thread cutting drive rod is driven to rotate in different directions around the rotating axial screw, and drives the lifting and pressing thread cutting action and the resetting action respectively.

[0004] In the above-mentioned related technologies, the thread trimming action is that when the motor drives the thread trimming driving rod to lift and press, another sub-motion is performed through the thread trimming pull rod. The thread trimming driving rod pulls the thread trimming moving knife to rotate counterclockwise around the thread trimming moving knife rotation axis as the rotation center, and moves closer to the thread trimming fixed knife until the stitches are cut. However, in actual use, it is found that because the thread trimming action and the presser foot lifting action are performed at the same time, the thread ends are cut when the presser foot is halfway lifted, resulting in a long thread end left on the product, and a subsequent thread end trimming process needs to be added, increasing production costs. Summary of the invention

[0005] The purpose of the utility model is to solve the above-mentioned problems existing in the prior art and to provide a thread trimming and presser foot lifting mechanism for a button sewing machine, which can trim the thread first and then lift the presser foot by driving a driving cam to rotate through a driving motor, staggered driving thread trimming and lifting and pressing actions.

[0006] The purpose of the utility model can be achieved through the following technical solutions: the thread trimming and presser foot lifting mechanism of the button sewing machine includes a driving motor, a presser foot lifting driving block, a thread trimming driving block, a thread trimming blade and a button clamp block located in a casing, a driving cam is installed on the output shaft of the driving motor, the presser foot lifting driving block and the thread trimming driving block are both close to the side of the driving cam, when the driving motor drives the driving cam to rotate, the driving cam drives the thread trimming driving block and the presser foot lifting driving block to rotate in turn, and the rotating thread trimming driving block and the presser foot lifting driving block respectively drive the thread trimming blade and the button clamp block to rotate in turn through a linkage.

[0007] In the thread cutting and presser foot lifting mechanism of the above button sewing machine, the linkage member includes a presser foot lifting transmission shaft, a presser foot connecting rod, a presser foot bent rod, a first thread cutting connecting rod, a second thread cutting connecting rod, a thread cutting transmission shaft, a driving gear, a blade mounting rod, and a driven gear. The presser foot lifting transmission shaft is hinged inside the machine housing. The end of the presser foot driving block is fixedly connected to the presser foot lifting transmission shaft. The presser foot connecting rod is also fixedly installed on the presser foot lifting transmission shaft. The presser foot bent rod is connected to the presser foot connecting rod. The bottom of the presser foot bent rod is connected to one end of the button clamp block, and the other end of the button clamp block is hinged on the machine housing.

[0008] In the thread cutting and presser foot lifting mechanism of the above button sewing machine, the middle of the thread cutting driving block is hinged on the machine housing. One end of the thread cutting driving block abuts against the side surface of the driving cam. The other end of the thread cutting driving block is hinged to the first thread cutting connecting rod. The end of the first thread cutting connecting rod is hinged to the second thread cutting connecting rod. The thread cutting transmission shaft is hinged inside the machine housing. The end of the second thread cutting connecting rod is fixed on the thread cutting transmission shaft. The driving gear is installed on the thread cutting transmission shaft. The blade mounting rod is hinged inside the machine housing. The thread cutting blade is installed at one end of the blade mounting rod. The other end of the blade mounting rod is installed with the driven gear, and the driven gear meshes with the driving gear.

[0009] In the thread cutting and presser foot lifting mechanism of the above button sewing machine, the thread cutting driving block is approximately L-shaped. The presser foot driving block is located below the driving cam, and the thread cutting driving block is located on the side of the driving cam. The driving cam includes a small-diameter end and a large-diameter end. Both the presser foot driving block and the thread cutting driving block abut against the small-diameter end of the driving cam.

[0010] In the thread cutting and presser foot lifting mechanism of the above button sewing machine, when the driving motor starts and drives the driving cam to rotate, the large-diameter end of the rotating driving cam first contacts the thread cutting driving block and drives the thread cutting driving block to rotate. The rotation of the thread cutting driving block drives the thread cutting transmission shaft and the driving gear to rotate through the first thread cutting connecting rod and the second thread cutting connecting rod. Thus, the driven gear, the blade mounting rod, and the thread cutting blade are driven to rotate, and the thread cutting blade moves upward to contact the sewing thread and complete thread cutting.

[0011] In the thread cutting and presser foot lifting mechanism of the above button sewing machine, the driving motor continues to drive the driving cam to rotate until the large-diameter end on the driving cam contacts the presser foot driving block and drives the presser foot driving block and the presser foot lifting transmission shaft to rotate. The rotation of the presser foot lifting transmission shaft drives the presser foot bent rod to move upward through the presser foot connecting rod. At the same time, the button clamp block is driven to rotate upward to complete the lifting of the presser foot.

[0012] In the above-mentioned thread trimming and presser foot lifting mechanism of the button sewing machine, a needle plate is installed on the casing, the middle part of the needle plate protrudes to form an accommodating cavity, the blade mounting rod is located in the accommodating cavity, and a fixed knife is also fixed to the bottom of the end surface of the needle plate, the fixed knife is located on the side of the thread trimming blade, the end surface of the fixed knife protrudes from the needle plate and is provided with a fixed knife inclined surface, the thread trimming blade contacts the suture when it rotates upward, and the suture is also contacted with the fixed knife, and the thread trimming blade and the fixed knife cooperate to complete the thread trimming.

[0013] In the thread trimming and presser foot lifting mechanism of the above-mentioned button sewing machine, a spring rod is also fixed on the button clamp block, and the spring rod is located on the side of the presser foot lifting curved rod. A movable through hole is formed on the casing, and the top of the spring rod is located in the movable through hole. A spring is sleeved on the spring rod, and the two ends of the spring are respectively in contact with the button clamp block and the casing. When the button clamp block rotates upward, the spring rod moves upward with the button clamp block relative to the casing, and the spring is compressed at this time; when the presser foot is lifted, the spring force is released, driving the button clamp block to reset.

[0014] Compared with the prior art, the thread trimming and presser foot lifting mechanism of the button sewing machine drives the driving cam to rotate through the driving motor, staggers the driving thread trimming and lifting and pressing actions, realizes thread trimming first and then presser foot lifting, makes the thread ends shorter and the stitches more beautiful, and does not need to set up a subsequent thread end trimming process, thereby reducing production costs; a fixed knife is provided, and the thread trimming blade and the fixed knife cooperate to complete the thread trimming, ensuring that the cut thread ends are very short and more beautiful; it has the advantages of simple structure, convenient operation, precise control and fast response; the lifting height of the thread trimming blade and the button clamp block can be adjusted by replacing driving cams of different sizes; at the same time, compared with the electromagnet linear drive commonly used in the prior art, the thread trimming and presser foot lifting mechanism of the button sewing machine adopts a driving motor for rotational drive, which reduces the impact on related connecting parts, thereby reducing the loss of related connecting parts, extending the service life of the equipment, and the movement is smoother, and the machine vibration and noise are smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the thread trimming and presser foot lifting mechanism of the button sewing machine.

[0016] Figure 2 It is a three-dimensional structural schematic diagram of the thread trimming and presser foot lifting mechanism of the button sewing machine from another angle.

[0017] Figure 3 The present invention is a three-dimensional structural schematic diagram of a thread trimming and presser foot lifting mechanism of the button sewing machine located inside a casing.

[0018] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0019] In the figure, 1 is a driving motor; 2 is a driving cam; 3 is a presser foot driving block; 4 is a thread cutting driving block; 5 is a presser foot transmission shaft; 6 is a presser foot connecting rod; 7 is a presser foot bent rod; 8 is a first thread cutting connecting rod; 9 is a second thread cutting connecting rod; 10 is a thread cutting transmission shaft; 11 is a driving gear; 12 is a thread cutting blade; 13 is a blade mounting rod; 14 is a driven gear; 15 is a machine housing; 16 is a button clamp block. Specific embodiments

[0020] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0021] As Figures 1-4 shown, the thread cutting and presser foot mechanism of this button sewing machine includes a driving motor 1, a presser foot driving block 3, a thread cutting driving block 4, a thread cutting blade 12 and a button clamp block 16 located inside the machine housing 15. A driving cam 2 is installed on the output shaft of the driving motor 1, and both the presser foot driving block 3 and the thread cutting driving block 4 are closely adjacent to the side surface of the driving cam 2. When the driving motor 1 drives the driving cam 2 to rotate, the driving cam 2 drives the thread cutting driving block 4 and the presser foot driving block 3 to rotate in sequence. During the rotation, the thread cutting driving block 4 and the presser foot driving block 3 drive the thread cutting blade 12 and the button clamp block 16 to rotate in sequence through linkages respectively.

[0022] In the above technical solution: The linkages include a presser foot transmission shaft 5, a presser foot connecting rod 6, a presser foot bent rod 7, a first thread cutting connecting rod 8, a second thread cutting connecting rod 9, a thread cutting transmission shaft 10, a driving gear 11, a blade mounting rod 13, and a driven gear 14. The presser foot transmission shaft 5 is hinged inside the machine housing 15. The end of the presser foot driving block 3 is fixedly connected to the presser foot transmission shaft 5. A presser foot connecting rod 6 is also fixedly installed on the presser foot transmission shaft 5. The presser foot connecting rod 6 is connected to the presser foot bent rod 7. The bottom of the presser foot bent rod 7 is connected to one end of the button clamp block 16, and the other end of the button clamp block 16 is hinged on the machine housing 15.

[0023] In the above technical solution: The thread cutting driving block 4 is approximately L-shaped. The middle of the thread cutting driving block 4 is hinged on the machine housing 15. One end of the thread cutting driving block 4 is closely adjacent to the side surface of the driving cam 2, and the other end of the thread cutting driving block 4 is hinged to the first thread cutting connecting rod 8. The end of the first thread cutting connecting rod 8 is hinged to the second thread cutting connecting rod 9. The thread cutting transmission shaft 10 is hinged inside the machine housing 15. The end of the second thread cutting connecting rod 9 is fixed on the thread cutting transmission shaft 10. A driving gear 11 is installed on the thread cutting transmission shaft 10. The blade mounting rod 13 is hinged inside the machine housing 15. The thread cutting blade 12 is installed at one end of the blade mounting rod 13, and a driven gear 14 is installed at the other end of the blade mounting rod 13. The driven gear 14 meshes with the driving gear 11.

[0024] In the above technical solution: The presser foot lifting drive block 3 is located below the drive cam 2, and the thread cutting drive block 4 is located on the side of the drive cam 2. The drive cam 2 includes a small-diameter end and a large-diameter end. In the initial state, both the presser foot lifting drive block 3 and the thread cutting drive block 4 are close to the small-diameter end of the drive cam 2. When it is necessary to cut the thread and lift the presser foot, the drive motor 1 starts and drives the drive cam 2 to rotate counterclockwise (i.e., rotate in the direction of a marked in Figure 2 ). During the rotation of the drive cam 2, the large-diameter end first contacts the thread cutting drive block 4 and drives the thread cutting drive block 4 to rotate counterclockwise. The rotation of the thread cutting drive block 4 drives the thread cutting transmission shaft 10 and the driving gear 11 to rotate clockwise through the first thread cutting connecting rod 8 and the second thread cutting connecting rod 9, so that the driven gear 14, the blade mounting rod 13, and the thread cutting blade 12 are driven to rotate counterclockwise, and the thread cutting blade 12 contacts the sewing thread upward and completes the thread cutting.

[0025] When the above drive cam 2 rotates, the small-diameter end still contacts the presser foot lifting drive block 3, and the presser foot lifting drive block 3 does not move. The drive motor 1 continues to drive the drive cam 2 to rotate until the large-diameter end on the drive cam 2 contacts the presser foot lifting drive block 3 and drives the presser foot lifting drive block 3 and the presser foot transmission shaft 5 to rotate counterclockwise. The rotation of the presser foot transmission shaft 5 drives the presser foot bent lever 7 to move upward through the presser foot connecting rod 6, and at the same time, the button clamp block 16 is driven to rotate upward to complete the lifting of the presser foot.

[0026] After the thread cutting and presser foot lifting are completed, the drive motor continues to drive the drive cam 2 to rotate. The drive cam 2 rotates one week and returns to the initial state. At this time, the thread cutting drive block 4 is pressed downward and rotated to reset to the state of being close to the small-diameter end of the drive cam 2 due to the gravity of the first thread cutting connecting rod 8, and the thread cutting blade 12 rotates to reset; similarly, due to the gravity of the button clamp block 16 pressing downward, the presser foot transmission shaft 5 and the presser foot lifting drive block 3 rotate clockwise to reset, and the presser foot lifting drive block 3 resets to the state of being close to the small-diameter end of the drive cam 2.

[0027] In the above technical solution: A needle plate 18 is installed on the machine shell 15. A receiving cavity is formed by the protrusion in the middle of the needle plate 18. The blade mounting rod 13 is located in the receiving cavity. A fixed knife 17 is also fixed at the bottom of the end face of the needle plate 18. The fixed knife 17 is located on the side of the thread cutting blade 12. The end face of the fixed knife 17 protrudes from the needle plate 18 and is provided with a fixed knife inclined surface 171. When the thread cutting blade 12 rotates upward, it contacts the sewing thread and also makes the sewing thread contact the fixed knife 17. The thread cutting blade 12 and the fixed knife 17 cooperate to complete the thread cutting. Since the distance between the end face of the fixed knife 17 and the end face of the needle plate 18 is very short, the thread end cut by the cooperation of the thread cutting blade 12 and the fixed knife 17 is short.

[0028] In the above technical solution: A spring rod is also fixed on the button pliers block 16. The spring rod is located on the side of the presser foot lifting lever 7. A moving through hole is made on the machine housing 15, and the top of the spring rod is located in the moving through hole. A spring 19 is sleeved on the spring rod, and the two ends of the spring 19 are respectively in contact with the button pliers block 16 and the machine housing 15. When the button pliers block 16 rotates upward, the spring rod moves upward relative to the machine housing 15 along with the button pliers block 16, and at this time the spring 19 is compressed. After the presser foot is lifted, the elastic force of the spring 19 is released, driving the button pliers block 16 to reset.

[0029] The thread cutting and presser foot lifting mechanism of this button sewing machine drives the driving cam 2 to rotate through the driving motor 1, staggering the two actions of thread cutting and presser foot lifting, realizing thread cutting first and then presser foot lifting, making the cut thread end shorter and the stitch more beautiful, and eliminating the need to set up subsequent trimming processes for the thread ends, thereby reducing production costs; A fixed knife 17 is provided, and the thread cutting blade 12 cooperates with the fixed knife 17 to complete thread cutting, ensuring that the cut thread end is very short and more beautiful; It has the advantages of simple structure, convenient operation, precise control, and fast response; The lifting heights of the thread cutting blade 12 and the button pliers block 16 can be adjusted by replacing driving cams 2 of different sizes; At the same time, compared with the linear drive of the commonly used electromagnet in the prior art, the thread cutting and presser foot lifting mechanism of this button sewing machine uses the driving motor 1 for rotational drive, reducing the impact on relevant connecting parts, thereby reducing the wear of relevant connecting parts and extending the service life of the equipment, with smoother movement, less vibration and noise of the machine.

[0030] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0031] Although terms such as driving motor 1; driving cam 2; presser foot driving block 3; thread cutting driving block 4; presser foot transmission shaft 5; presser foot connecting rod 6; presser foot lifting lever 7; first thread cutting connecting rod 8; second thread cutting connecting rod 9; thread cutting transmission shaft 10; driving gear 11; thread cutting blade 12; blade mounting rod 13; driven gear 14; machine housing 15; button pliers block 16; fixed knife 17; fixed knife inclined surface 171; needle plate 18; spring 19 are used more frequently in this article, the possibility of using other terms is not excluded. Using these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

[0032] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. The thread trimming and presser foot lifting mechanism of the button sewing machine is characterized by The invention comprises a driving motor (1), a presser foot lifting driving block (3), a thread trimming driving block (4), a thread trimming blade (12) and a button clamp block (16) located in a housing (15); a driving cam (2) is installed on the output shaft of the driving motor (1); the presser foot lifting driving block (3) and the thread trimming driving block (4) are both close to the side of the driving cam (2); when the driving motor (1) drives the driving cam (2) to rotate, the driving cam (2) drives the thread trimming driving block (4) and the presser foot lifting driving block (3) to rotate in turn; the rotating thread trimming driving block (4) and the presser foot lifting driving block (3) respectively drive the thread trimming blade (12) and the button clamp block (16) to rotate in turn through a linkage member.

2. The thread trimming and presser foot lifting mechanism of the button sewing machine according to claim 1, characterized in that The linkage comprises a presser foot lifting transmission shaft (5), a presser foot lifting connecting rod (6), a presser foot lifting curved rod (7), a first thread trimming connecting rod (8), a second thread trimming connecting rod (9), a thread trimming transmission shaft (10), a driving gear (11), a blade mounting rod (13), and a driven gear (14); the presser foot lifting transmission shaft (5) is hinged in the housing (15); the end of the presser foot lifting driving block (3) is fixedly connected to the presser foot lifting transmission shaft (5); the presser foot lifting connecting rod (6) is also fixedly installed on the presser foot lifting transmission shaft (5); the presser foot lifting connecting rod (6) is connected to the presser foot lifting curved rod (7); the bottom of the presser foot lifting curved rod (7) is connected to one end of the button clamp block (16); the other end of the button clamp block (16) is hinged to the housing (15); The middle part of the thread trimmer drive block (4) is hinged on the housing (15), one end of the thread trimmer drive block (4) is close to the side of the drive cam (2), the other end of the thread trimmer drive block (4) is hinged to the first thread trimmer link (8), the end of the first thread trimmer link (8) is hinged to the second thread trimmer link (9), the thread trimmer transmission shaft (10) is hinged in the housing (15), the end of the second thread trimmer link (9) is fixed on the thread trimmer transmission shaft (10), the driving gear (11) is installed on the thread trimmer transmission shaft (10), the blade mounting rod (13) is hinged in the housing (15), the thread trimmer blade (12) is installed on one end of the blade mounting rod (13), the other end of the blade mounting rod (13) is installed with the driven gear (14), and the driven gear (14) and the driving gear (11) are meshed.

3. The thread trimming and presser foot lifting mechanism of the button sewing machine according to claim 2, characterized in that The thread trimming drive block (4) is approximately L-shaped, the presser foot lifting drive block (3) is located below the driving cam (2), the thread trimming drive block (4) is located on the side of the driving cam (2), the driving cam (2) includes a small diameter end and a large diameter end, and the presser foot lifting drive block (3) and the thread trimming drive block (4) are both close to the small diameter end of the driving cam (2); The driving motor (1) is started and drives the driving cam (2) to rotate. The large diameter end of the rotating driving cam (2) first contacts the thread trimming driving block (4) and drives the thread trimming driving block (4) to rotate. The rotation of the thread trimming driving block (4) drives the thread trimming transmission shaft (10) and the driving gear (11) to rotate through the first thread trimming connecting rod (8) and the second thread trimming connecting rod (9), so that the driven gear (14), the blade mounting rod (13) and the thread trimming blade (12) are driven to rotate. The thread trimming blade (12) contacts the suture upwards and completes thread trimming. The driving motor (1) continues to drive the driving cam (2) to rotate until the large diameter end of the driving cam (2) contacts the presser foot lifting driving block (3), and drives the presser foot lifting driving block (3) and the presser foot lifting transmission shaft (5) to rotate. The rotation of the presser foot lifting transmission shaft (5) drives the presser foot lifting bending rod (7) to move upward through the presser foot lifting connecting rod (6), and at the same time the button clamp block (16) is driven to rotate upward, thereby completing the presser foot lifting.

4. The thread trimming and presser foot lifting mechanism of the button sewing machine according to claim 2, characterized in that A needle plate (18) is mounted on the housing (15), the middle part of the needle plate (18) protrudes to form an accommodating cavity, the blade mounting rod (13) is located in the accommodating cavity, a fixed knife (17) is fixed to the bottom of the end surface of the needle plate (18), the fixed knife (17) is located on the side of the thread cutting blade (12), the end surface of the fixed knife (17) protrudes from the needle plate (18) and is provided with a fixed knife inclined surface (171), when the thread cutting blade (12) rotates upward, it contacts with the suture, and the suture is also contacted with the fixed knife (17), and the thread cutting blade (12) and the fixed knife (17) cooperate to complete the thread cutting.

5. The thread trimming and presser foot lifting mechanism of the button sewing machine according to claim 2, characterized in that A spring rod is also fixed on the button clamp block (16), and the spring rod is located on the side of the presser foot lifting curved rod (7). A movable through hole is formed on the housing (15), and the top of the spring rod is located in the movable through hole. A spring (19) is sleeved on the spring rod, and the two ends of the spring (19) are respectively in contact with the button clamp block (16) and the housing (15). When the button clamp block (16) rotates upward, the spring rod moves upward with the button clamp block (16) relative to the housing (15), and at this time, the spring (19) is compressed; when the presser foot is lifted, the elastic force of the spring (19) is released, driving the button clamp block (16) to reset.

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