Cutting mechanism for sewing machine

Abstract

The utility model discloses a cutting mechanism for a sewing machine, which comprises a working table, a lower cutter component for cutting cloth is arranged below the working table, an upper pressing component for pressing the cloth is arranged above the working table, and the upper pressing component is arranged right above the lower cutter component; the lower cutter assembly comprises a first connecting rod installed on the first installation base in a sliding mode, and a lower cutter used for cutting cloth is arranged at the upper end of the first connecting rod. The upper material pressing assembly comprises a second connecting rod installed on the second installation base in a sliding mode. The lower end of the second connecting rod is connected with an upper cutter or a pressing sleeve matched with the lower cutter.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines, and specifically relates to a cutting mechanism for sewing machines. Background Art

[0002] At present, vibration knives on the market are mainly used for cutting and processing flexible materials such as leather materials, fabrics, paper foams, etc. The vibration knife drives the tool to reciprocate at high speed through a motor to cut the material. The blade of the vibration knife adopts an up-and-down vibration cutting method, and adjusts the angle to achieve cutting of any shape.

[0003] Existing vibration knives generally use a single-knife method to cut fabrics. When cutting some relatively thick materials, the cutting accuracy is poor, affecting the cutting quality of the fabrics. Summary of the Invention

[0004] Aiming at the above technical problems, the utility model provides a cutting mechanism for sewing machines, which can conveniently switch between single-knife or double-knife modes for cutting operations according to different materials of fabrics, improving work efficiency. <~

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows: A cutting mechanism for sewing machines includes a workbench. A lower cutting knife assembly for cutting fabrics is provided below the workbench, and an upper pressing material assembly for pressing the fabrics is provided above the workbench. The upper pressing material assembly is arranged directly above the lower cutting knife assembly. The lower cutting knife assembly includes a first connecting rod slidably installed on a first mounting seat, and a lower cutting knife for cutting fabrics is provided at the upper end of the first connecting rod. The upper pressing material assembly includes a second connecting rod slidably installed on a second mounting seat. A upper cutting knife or a pressing sleeve cooperating with the lower cutting knife is connected to the lower end of the second connecting rod.

[0006] To optimize the above technical solution, the utility model also includes the following improved technical solutions.

[0007] A second motor mounting plate is provided on one side of the first mounting seat. A second motor for driving the first connecting rod to reciprocate vertically is provided on one side of the second motor mounting plate. A cam rotatably installed is provided on the other side of the second motor mounting plate. The driving shaft of the second motor is rotationally connected to the cam. A first crank rotatably installed is provided on the other side of the cam. The cam is rotationally connected to one end of the first crank through a first crankshaft. The other end of the first crank is rotationally connected to the first connecting rod through a second transmission member.

[0008] The second motor mounting plate is slidably installed on one side of the first mounting seat. A first lifting cylinder is provided below the second motor mounting plate. The cylinder body of the first lifting cylinder is connected to the first mounting seat, and the driving rod of the first lifting cylinder is connected to the second motor mounting plate.

[0009] The first link is provided with a first bushing and a second bushing. The first link is formed with a first groove and a second groove. The first bushing is slidably mounted on the first groove, and the second bushing is slidably mounted on the second groove. The lower end of the first bushing is rotatably mounted on the upper end of the first mounting seat through a first bearing, and the upper end of the second bushing is rotatably mounted on the lower end of the first mounting seat through a second bearing. A material supporting seat is provided at the upper end of the first bushing, and a cutter groove for the up-and-down movement of the lower cutter is formed on the top plate of the material supporting seat.

[0010] A first motor for driving the first link to rotate is provided at the bottom of the first mounting seat. A first synchronous pulley is provided on the driving shaft of the first motor, and a second synchronous pulley is provided at the lower end of the second bushing on the first link. A first synchronous belt is sleeved on the first synchronous pulley and the second synchronous pulley.

[0011] The second link is formed with a third groove. The second link is provided with a third bushing and a fourth bushing. The third bushing is slidably mounted on the third groove, and the fourth bushing is slidably mounted on the second link. The lower end of the third bushing is rotatably mounted on the upper end of the second mounting seat through a fourth bearing. The second link passes through the second mounting seat, and the lower end of the second link is rotatably mounted on the lower end of the second mounting seat through the fourth bushing.

[0012] A second lifting cylinder is provided on one side of the second mounting seat. The second lifting cylinder is connected to the second link through a third transmission member. The driving rod of the second lifting cylinder is connected to one end of the third transmission member, and the other end of the third transmission member is connected to the second link.

[0013] Compared with the prior art, in the cutting mechanism of the present utility model, the fabric to be cut is located between the upper material pressing assembly and the lower cutter assembly. The upper material pressing assembly presses the fabric downward, and the lower cutter assembly cuts the fabric upward. When a cutter is installed at the lower end of the second link, it is in a double-cutter mode at this time; when a material pressing sleeve is installed at the lower end of the second link, it is in a single-cutter mode at this time. The single-double cutter switching structure is simple and easy to disassemble and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional structural schematic diagram of this embodiment.

[0015] Figure 2 is an exploded three-dimensional structural schematic diagram of the lower cutter assembly.

[0016] Figure 3 is an exploded three-dimensional structural schematic diagram of the upper material pressing assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings.

[0018] Figures 1 to 3 Shown is a structural schematic diagram of the present utility model.

[0019] The reference numerals therein are: the first mounting seat 1, the first connecting rod 2, the first groove 2a, the second groove 2b, the lower cutter 3, the material supporting seat 4, the cutter groove 4a, the first bushing 5, the second bushing 6, the first bearing 7, the second bearing 8, the first motor 9, the first synchronous pulley 10, the second synchronous pulley 11, the first synchronous belt 12, the second motor 13, the second motor mounting plate 14, the cam 15, the first central hole 15a, the first eccentric hole 15b, the first crankshaft 16, the first connecting shaft 16a, the second connecting shaft 16b, the first crank 17, the second transmission member 18, the first hoop 19, the first slide rail 20, the first lifting cylinder 21, the first lifting cylinder mounting seat 22, the first lifting cylinder joint 23, the second mounting seat 24, the second connecting rod 25, the third groove 25a, the third bushing 26, the fourth bushing 27, the fourth bearing 28, the material pressing driving cylinder 29, the material pressing seat 30, the third motor 31, the third gear 32, the fourth gear 33, the second synchronous belt 34, the second lifting cylinder 35, the third transmission member 36, the fifth bearing 37, the upper cutter 38, the upper cutter mounting seat 39, and the material pressing sleeve 40.

[0020] As Figure 1 shown, a cutting mechanism for a sewing machine according to the present utility model includes a workbench. A lower cutter assembly for cutting fabric is provided below the workbench, and an upper material pressing assembly for pressing the fabric is provided above the workbench. The upper material pressing assembly is disposed directly above the lower cutter assembly, and the fabric to be cut is disposed between the upper material pressing assembly and the lower cutter assembly. Meanwhile, the cutting mechanism can switch between a double-cutter mode and a single-cutter mode.

[0021] As Figure 2 shown, the lower cutter assembly includes a first connecting rod 2 mounted on the first mounting seat 1. The upper end of the first connecting rod 2 is provided with a lower cutter 3 for cutting fabric. The first connecting rod 2 is provided with a first bushing 5 and a second bushing 6. The first connecting rod 2 is formed with a first groove 2a and a second groove 2b. The first groove 2a slidably mounts the first bushing 5, and the second groove 2b slidably mounts the second bushing 6. When the first connecting rod 2 moves up and down, the first groove 2a moves up and down relative to the first bushing 5, and the second groove 2b moves up and down relative to the second bushing 6.

[0022] The upper end of the first bushing 5 is mounted with a material supporting seat 4. The top plate of the material supporting seat 4 is formed with a cutter groove 4a for the lower cutter 3 to move up and down. The lower end of the first bushing 5 is rotatably mounted on the upper end of the first mounting seat 1 through a first bearing 7. The first connecting rod 2 can drive the lower cutter 3 to move up and down through the cutter groove 4a. The first connecting rod 2 passes through the first mounting seat 1, and the upper end of the second bushing 6 is rotatably mounted on the lower end of the first mounting seat 1 through a second bearing 8.

[0023] Below the first mounting base 1, there is a first motor 9 that drives the first connecting rod 2 to rotate. A first synchronous pulley 10 is installed on the driving shaft of the first motor 9. At the lower end of the second bushing 6 on the first connecting rod 2, a second synchronous pulley 11 is installed. A first synchronous belt 12 is sleeved on the first synchronous pulley 10 and the second synchronous pulley 11. The first motor 9 drives the lower cutting knife 3 on the first connecting rod 2 to rotate through the first synchronous belt 12.

[0024] On one side of the first mounting base 1, there is a second motor mounting plate 14. On one side of the second motor mounting plate 14, there is a second motor 13 that drives the first connecting rod 2 to perform vertical reciprocating motion. On the other side of the second motor mounting plate 14, there is a cam 15. The cam 15 is provided with a first central hole 15a and a first eccentric hole 15b. The driving shaft of the second motor 13 is installed in the first central hole 15a of the cam 15.

[0025] On the other side of the cam 15, there is a first crankshaft 16. On one side of the first crankshaft 16, there is a first connecting shaft 16a. The first connecting shaft 16a is fixedly connected to the first eccentric hole 15b on the first crankshaft 16. On the other side of the first crankshaft 16, there is a first crank 17. On the other side of the first crankshaft 16, there is a second connecting shaft 16b. The second connecting shaft 16b is rotatably connected to one end of the first crank 17.

[0026] At the other end of the first crank 17, there is a second transmission member 18 connected to the first connecting rod 2. One end of the second transmission member 18 is fixedly connected to the other end of the first crank 17. The other end of the second transmission member 18 is slidably installed on the first connecting rod 2. The first connecting rod 2 can rotate relative to the other end of the second transmission member 18. The other end of the second transmission member 18 is fixed to the first connecting rod 2 through a first hoop 19. The second transmission member 18 can drive the first connecting rod 2 to move up and down.

[0027] The second motor 13 drives the cam 15 to rotate. The first eccentric hole 15b on the cam 15 rotates around the first central hole 15a. The cam 15 drives the second connecting shaft 16b on the first crankshaft 16 to rotate around the first connecting shaft 16a. The first crankshaft 16 drives the first crank 17 to rotate. The first crank 17 converts the circular motion into a reciprocating motion in the vertical direction. The first crank 17 drives the second transmission member 18 to move up and down. The second transmission member 18 drives the lower cutting knife 3 on the first connecting rod 2 to move up and down.

[0028] The second motor mounting plate 14 is slidably installed on the first mounting base 1 through a first slide rail 20. Below the second motor mounting plate 14, there is a first lifting cylinder 21. The cylinder body of the first lifting cylinder 21 is fixed to the first mounting base 1 through a first lifting cylinder mounting seat 22. The driving rod of the first lifting cylinder 21 is connected to the second motor mounting plate 14 through a first lifting cylinder joint 23.

[0029] The first lifting cylinder 21 drives the second motor mounting plate 14 to move upward. The second transmission member 18 connected to the second motor mounting plate 14 drives the first connecting rod 2 to move upward, and the lower cutting knife 3 on the first connecting rod 2 approaches the fabric. The second motor 13 drives the lower cutting knife 3 to vibrate up and down to cut the fabric.

[0030] As Figure 3 shown, the upper pressing component includes a second connecting rod 25 mounted on the second mounting seat 24. A upper cutting knife 38 or a pressing sleeve 40 for cooperating with the lower cutting knife 3 is provided at the lower end of the second connecting rod 25. When the upper cutting knife 38 is installed at the lower end of the second connecting rod 25, it is in a double-knife mode at this time. When the pressing sleeve 40 is installed at the lower end of the second connecting rod 25, it is in a single-knife mode at this time. The pressing sleeve 40 has an elliptical pressing wall that presses the upper surface of the fabric, and an elliptical groove for the cutting edge of the lower cutting knife 3 to extend into the pressing sleeve 40 is provided at the center of the pressing wall.

[0031] The second connecting rod 25 is provided with a third groove 25a. A third bushing 26 and a fourth bushing 27 are provided on the second connecting rod 25. The third bushing 26 is slidably mounted on the third groove 25a, and the fourth bushing 27 is slidably mounted on the second connecting rod 25. When the second connecting rod 25 moves up and down, the third bushing 26 moves up and down relative to the third groove 25a, and the second connecting rod 25 moves up and down relative to the fourth bushing 27.

[0032] The lower end of the third bushing 26 is rotatably mounted on the upper end of the second mounting seat 24 through a fourth bearing 28. The second connecting rod 25 passes through the second mounting seat 24, and the lower end of the second connecting rod 25 is rotatably mounted on the lower end of the second mounting seat 24 through the fourth bushing 27.

[0033] A pressing drive cylinder 29 is provided on one side of the second mounting seat 24, and a pressing seat 30 is provided below the second mounting seat 24. The cylinder body of the pressing drive cylinder 29 is fixedly connected to the second mounting seat 24, and the drive rod of the pressing drive cylinder 29 is fixedly connected to the pressing seat 30. The pressing drive cylinder 29 drives the pressing seat 30 to move downward, and the bottom of the pressing seat 30 fixes the fabric to be cut, so that the cutting part of the fabric to be cut is in a tensioned state, avoiding wrinkles on the fabric.

[0034] A third motor 31 for driving the second connecting rod 25 to rotate is provided at the upper end of the second connecting rod 25. A third gear 32 is rotatably mounted on the drive shaft of the third motor 31. A fourth gear 33 is mounted on the third bushing 26 of the second connecting rod 25. A second synchronous belt 34 is sleeved on the third gear 32 and the fourth gear 33, and the drive shaft of the third motor 31 drives the second connecting rod 25 to rotate through the second synchronous belt 34.

[0035] On one side of the second mounting base 24, there is a second lifting cylinder 35 for driving the second connecting rod 25 to move up and down. The second lifting cylinder 35 is connected to the second connecting rod 25 through a third transmission member 36. The driving rod of the second lifting cylinder 35 is fixedly connected to one end of the third transmission member 36, and the other end of the third transmission member 36 is slidably mounted on the second connecting rod 25. The other end of the third transmission member 36 is fixed on the second connecting rod 25 through a fifth bearing 37.

[0036] In the double-knife mode, the second lifting cylinder 35 drives the upper cutting knife 38 on the second connecting rod 25 to move downward close to the cloth to be cut, the first lifting cylinder 21 drives the lower cutting knife 3 to move upward close to the cloth to be cut, and the second motor 13 drives the lower cutting knife 3 to vibrate up and down. During the working process, the first motor 9 drives the lower cutting knife 3 to rotate, the third motor 31 drives the upper cutting knife 38 to rotate, and the lower cutting knife 3 and the upper cutting knife 38 rotate synchronously to cooperate in cutting the cloth.

[0037] In the single-knife mode, the second lifting cylinder 35 drives the pressure sleeve 40 on the second connecting rod 25 to move downward close to the cloth to be cut, and the first lifting cylinder 21 drives the lower cutting knife 3 to move upward close to the cloth to be cut. With the cloth fixed by the pressure sleeve 40, the second motor 13 drives the cutting edge of the lower cutting knife 3 to vibrate in the notch of the pressure sleeve 40 to cut the cloth. During the working process, the first motor 9 drives the lower cutting knife 3 to rotate, and the third motor 31 drives the pressure sleeve 40 on the second connecting rod 25 to rotate synchronously so that the elliptical groove direction of the pressure sleeve 40 is aligned with the lower cutting knife 3.

[0038] The second connecting rod 25 can be connected to both the upper cutting knife 38 and the upper cutting knife mounting base 39, or to the pressure sleeve 40. For cloth of different materials, the double-knife and single-knife modes can be conveniently and quickly switched to improve work efficiency.

[0039] The best embodiments of the present invention have been illustrated, and various changes or modifications made by those of ordinary skill in the art will not depart from the scope of the present invention.

Claims

1. A cutting mechanism for a sewing machine, comprising a workbench, characterized in that: A lower cutting knife assembly for cutting the fabric is provided below the workbench, and an upper pressing component for pressing the fabric is provided above the workbench. The upper pressing component is arranged directly above the lower cutting knife assembly. The lower cutting knife assembly includes a first connecting rod (2) slidably mounted on a first mounting base (1), and a lower cutting knife (3) for cutting the fabric is provided at the upper end of the first connecting rod (2). The upper pressing component includes a second connecting rod (25) slidably mounted on a second mounting base (24). A upper cutting knife (38) or a pressing sleeve (40) that cooperates with the lower cutting knife is connected to the lower end of the second connecting rod (25).

2. The cutting mechanism for a sewing machine according to claim 1, wherein: A second motor mounting plate (14) is provided on one side of the first mounting base (1). A second motor (13) for driving the first connecting rod (2) to reciprocate vertically is provided on one side of the second motor mounting plate (14). A cam (15) is rotatably mounted on the other side of the second motor mounting plate (14). The drive shaft of the second motor (13) is rotatably connected to the cam (15). A first crank (17) is rotatable on the other side of the cam (15). The cam (15) is rotatably connected to one end of the first crank (17) through a first crankshaft (16), and the other end of the first crank (17) is rotatably connected to the first connecting rod (2) through a second transmission member (1).

3. The cutting mechanism for a sewing machine according to claim 2, wherein: The second motor mounting plate (14) is slidably mounted on one side of the first mounting base (1). A first lifting cylinder (21) is provided below the second motor mounting plate (14). The cylinder body of the first lifting cylinder (21) is connected to the first mounting base (1), and the drive rod of the first lifting cylinder (21) is connected to the second motor mounting plate (14).

4. The cutting mechanism for a sewing machine according to claim 3, wherein: A first shaft sleeve (5) and a second shaft sleeve (6) are provided on the first connecting rod (2). The first connecting rod is provided with a first groove (2a) and a second groove (2b). The first shaft sleeve (5) is slidably mounted on the first groove (2a), and the second shaft sleeve (6) is slidably mounted on the second groove (2b). The lower end of the first shaft sleeve (5) is rotatably mounted on the upper end of the first mounting base (1) through a first bearing (7), and the upper end of the second shaft sleeve (6) is rotatably mounted on the lower end of the first mounting base (1) through a second bearing (8). A material supporting seat (4) is provided at the upper end of the first shaft sleeve (5). A cutting knife groove (4a) for the up-and-down movement of the lower cutting knife (3) is provided on the top plate of the material supporting seat (4).

5. The cutting mechanism for a sewing machine according to claim 4, wherein: A first motor (9) for driving the first connecting rod (2) to rotate is provided at the bottom of the first mounting base (1). A first synchronous pulley (10) is provided on the drive shaft of the first motor (9). A second synchronous pulley (11) is provided at the lower end of the second shaft sleeve (6) on the first connecting rod (2). A first synchronous belt (12) is sleeved on the first synchronous pulley (10) and the second synchronous pulley (11).

6. The cutting mechanism for a sewing machine according to claim 5, characterized in that: The second connecting rod (25) is provided with a third groove (25a). A third bushing (26) and a fourth bushing (27) are arranged on the second connecting rod (25). The third bushing (26) is slidably mounted on the third groove (25a), and the fourth bushing (27) is slidably mounted on the second connecting rod (25). The lower end of the third bushing (26) is rotatably mounted on the upper end of the second mounting seat (24) through a fourth bearing (28). The second connecting rod (25) passes through the second mounting seat (24), and the lower end of the second connecting rod (25) is rotatably mounted on the lower end of the second mounting seat (24) through the fourth bushing (27).

7. The cutting mechanism for a sewing machine according to claim 6, characterized in that: A second lifting cylinder (35) is arranged on one side of the second mounting seat (24). The second lifting cylinder (35) is connected to the second connecting rod (25) through a third transmission member (36). The driving rod of the second lifting cylinder (35) is connected to one end of the third transmission member (36), and the other end of the third transmission member (36) is connected to the second connecting rod (25).

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