Lower cutter assembly of sewing machine cutting mechanism

Abstract

The utility model discloses a lower cutter component of a sewing machine cutting mechanism, which comprises a first mounting seat mounted below a workbench, a first connecting rod capable of axially sliding is mounted on the first mounting seat, and a lower cutter for cutting cloth is arranged at the upper end of the first connecting rod; a second motor mounting plate is arranged on one side of the first mounting seat, and a second motor is arranged on one side of the second motor mounting plate; a driving shaft of the second motor is connected with the cam; the cam is connected with one end of a first crank through a first crankshaft, the other end of the first crank is connected with a second transmission part, the second transmission part is rotationally connected with a first connecting rod, and first hoops fixed to the first connecting rod are arranged on the upper side and the lower side of the second transmission part respectively. The cam is driven by the second motor to rotate, then the lower cutter on the first connecting rod is driven to vibrate up and down for cutting, part loss is reduced, maintenance cost is saved, and production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines, in particular to a lower cutter assembly of a cutting mechanism of a sewing machine. Background Art

[0002] Currently, vibrating knives are primarily used for cutting flexible materials such as leather, cloth, paper, and foam. A motor drives the tool back and forth at high speed to cut the material. The blade vibrates up and down, and the angle can be adjusted to achieve any desired shape.

[0003] Existing vibrating knives generally use a single-knife method to cut cloth. When cutting some thicker materials, the cutting accuracy is poor, which affects the cutting quality of the cloth. Summary of the Invention

[0004] In response to the above-mentioned technical problems, the utility model provides a lower cutter assembly of a cutting mechanism of a sewing machine. The lower cutter assembly is located below the workbench. A second motor drives the lower cutter to vibrate up and down to cut the fabric into a desired shape. The transmission mode of the lower cutter vibration is optimized, the loss of parts is reduced, the stability of cutting fabric is increased, and production efficiency is improved.

[0005] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a lower cutter assembly of a cutting mechanism of a sewing machine, comprising a first mounting seat installed below a workbench, the first mounting seat being equipped with a first connecting rod that can slide axially, and the upper end of the first connecting rod being provided with a lower cutter for cutting cloth; a second motor mounting plate being provided on one side of the first mounting seat, and a second motor being provided on one side of the second motor mounting plate; the driving shaft of the second motor is connected to a cam; the cam is connected to one end of a first crank through a first crankshaft, and the other end of the first crank is connected to a second transmission member, the second transmission member is rotatably connected to the first connecting rod, and the upper and lower sides of the second transmission member are respectively provided with first clamps fixed to the first connecting rod.

[0006] In order to optimize the above technical solution, the present invention also includes the following improved technical solution.

[0007] The cam is provided with a first center hole and a first eccentric hole, and the first crankshaft is provided with an eccentric first connecting shaft and a second connecting shaft; the driving shaft of the second motor is fixedly connected to the first center hole of the cam, the first eccentric hole of the cam is fixedly connected to the first connecting shaft of the first crankshaft, and the second connecting shaft of the first crankshaft is rotatably connected to the first crank.

[0008] The second motor mounting plate is slidably mounted 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 mounting seat is provided with a rotatable first sleeve through a first bearing, and a rotatable second sleeve through a second bearing; the first connecting rod is slidably installed in the first sleeve and the second sleeve; the first connecting rod has a first groove that cooperates with the first sleeve, and a second groove that cooperates with the second sleeve; a material supporting seat is provided at the upper end of the first sleeve, and a top plate of the material supporting seat is formed with a cutting groove for the lower cutter to move up and down.

[0010] A first motor is provided at the bottom of the first mounting seat, a first synchronous wheel is provided on the driving shaft of the first motor, a second synchronous wheel is provided at the lower end of the second shaft sleeve, and a first synchronous belt is sleeved on the first synchronous wheel and the second synchronous wheel.

[0011] Compared with the prior art, in the lower cutter assembly of the present invention, the second motor drives the cam to rotate, the first eccentric hole on the cam rotates around the first center hole, the cam drives the second connecting shaft of the first crankshaft to rotate around the first connecting shaft, the first crankshaft drives the first crank to rotate, and the first crank converts the circular motion into reciprocating motion in the vertical direction, thereby driving the lower cutter on the first connecting rod to vibrate up and down, reducing parts loss, saving maintenance costs, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0013] Figure 2 It is a schematic diagram of the exploded three-dimensional structure of the lower cutter assembly.

[0014] Figure 3 It is a schematic diagram of the exploded three-dimensional structure of the upper pressing component. DETAILED DESCRIPTION

[0015] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0016] Figures 1 to 3 Shown is a schematic structural diagram of the present utility model.

[0017] The accompanying drawings are as follows: first mounting base 1, first connecting rod 2, first groove 2a, second groove 2b, lower cutter 3, support base 4, cutter groove 4a, first sleeve 5, second sleeve 6, first bearing 7, second bearing 8, first motor 9, first synchronous wheel 10, second synchronous wheel 11, first synchronous belt 12, second motor 13, second motor mounting plate 14, cam 15, first center hole 15a, first eccentric hole 15b, first crankshaft 16, first connecting shaft 16a, second connecting shaft 16b, first crank 17, second transmission Part 18, first clamp 19, first slide rail 20, first lifting cylinder 21, first lifting cylinder mounting seat 22, first lifting cylinder joint 23, second mounting seat 24, second connecting rod 25, third groove 25a, third sleeve 26, fourth sleeve 27, fourth bearing 28, pressing drive cylinder 29, pressing seat 30, third motor 31, third gear 32, fourth gear 33, second synchronous belt 34, second lifting cylinder 35, third transmission part 36, fifth bearing 37, upper cutter 38, upper cutter mounting seat 39, pressing sleeve 40.

[0018] like Figure 1 As shown, the utility model is a cutting mechanism for a sewing machine, comprising a workbench, a lower cutter assembly for cutting fabric is provided below the workbench, an upper pressing assembly for pressing the fabric is provided above the workbench, the upper pressing assembly is arranged directly above the lower cutter assembly, the fabric to be cut is arranged between the upper pressing assembly and the lower cutter assembly, and the cutting mechanism can switch between double-knife mode and single-knife mode.

[0019] like Figure 2 As shown, the lower cutter assembly includes a first connecting rod 2 mounted on a first mounting base 1, with a lower cutter 3 for cutting fabric disposed at the upper end of the first connecting rod 2. A first sleeve 5 and a second sleeve 6 are disposed on the first connecting rod 2. The first connecting rod 2 is formed with a first groove 2a and a second groove 2b. The first sleeve 5 is slidably mounted in the first groove 2a, and the second sleeve 6 is slidably mounted in the second groove 2b. When the first connecting rod 2 moves up and down, the first groove 2a moves up and down relative to the first sleeve 5, and the second groove 2b moves up and down relative to the second sleeve 6.

[0020] The upper end of the first sleeve 5 is mounted with a support base 4. The top plate of the support base 4 is formed with a cutting slot 4a for the up-and-down movement of the lower cutter 3. The lower end of the first sleeve 5 is rotatably mounted to the upper end of the first mounting base 1 via a first bearing 7. The first connecting rod 2 drives the lower cutter 3 up and down through the cutting slot 4a. The first connecting rod 2 extends through the first mounting base 1. The upper end of the second sleeve 6 is rotatably mounted to the lower end of the first mounting base 1 via a second bearing 8.

[0021] A first motor 9 for driving the first connecting rod 2 to rotate is provided below the first mounting seat 1, a first synchronous wheel 10 is installed on the driving shaft of the first motor 9, a second synchronous wheel 11 is installed on the lower end of the second shaft sleeve 6 on the first connecting rod 2, and a first synchronous belt 12 is sleeved on the first synchronous wheel 10 and the second synchronous wheel 11. The first motor 9 drives the lower cutter 3 on the first connecting rod 2 to rotate through the first synchronous belt 12.

[0022] A second motor mounting plate 14 is provided on one side of the first mounting seat 1, and a second motor 13 for driving the first connecting rod 2 to perform vertical reciprocating motion is installed on one side of the second motor mounting plate 14. A cam 15 is provided on the other side of the second motor mounting plate 14. The cam 15 has a first center hole 15a and a first eccentric hole 15b. The drive shaft of the second motor 13 is installed in the first center hole 15a of the cam 15.

[0023] A first crankshaft 16 is provided on the other side of the cam 15. A first connecting shaft 16a is formed on one side of the first crankshaft 16 and is fixedly connected to the first eccentric hole 15b on the first crankshaft 16. A first crank 17 is provided on the other side of the first crankshaft 16. A second connecting shaft 16b is formed on the other side of the first crankshaft 16 and is rotatably connected to one end of the first crank 17.

[0024] The other end of the first crank 17 is provided with 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, and the other end of the second transmission member 18 is slidably mounted on the first connecting rod 2, so that 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 by a first clamp 19, and the second transmission member 18 can drive the first connecting rod 2 to move up and down.

[0025] The second motor 13 drives the cam 15 to rotate, causing the first eccentric hole 15b on the cam 15 to rotate around the first center 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 then drives the first crank 17 to rotate. The first crank 17 converts the circular motion into vertical reciprocating motion, which in turn drives the second transmission member 18 to move up and down. The second transmission member 18 then drives the lower cutter 3 on the first connecting rod 2 to move up and down.

[0026] The second motor mounting plate 14 is slidably mounted on the first mounting base 1 through the first slide rail 20. A first lifting cylinder 21 is provided under the second motor mounting plate 14. The cylinder body of the first lifting cylinder 21 is fixed to the first mounting base 1 through the first lifting cylinder mounting base 22. The driving rod of the first lifting cylinder 21 is connected to the second motor mounting plate 14 through the first lifting cylinder joint 23.

[0027] The first lifting cylinder 21 drives the second motor mounting plate 14 upward, and the second transmission member 18 connected to the second motor mounting plate 14 drives the first connecting rod 2 upward, causing the lower cutter 3 on the first connecting rod 2 to approach the cloth. The second motor 13 drives the lower cutter 3 to vibrate up and down to cut the cloth.

[0028] like Figure 3 As shown, the upper press assembly includes a second connecting rod 25 mounted on a second mounting base 24. The lower end of the second connecting rod 25 is equipped with an upper cutter 38 or a press sleeve 40 for mating with the lower cutter 3. When the upper cutter 38 is mounted on the lower end of the second connecting rod 25, the system operates in a dual-cutting mode. When the press sleeve 40 is mounted on the lower end of the second connecting rod 25, the system operates in a single-cutting mode. The press sleeve 40 has an elliptical press wall that presses against the upper surface of the fabric. The center of the press wall has an elliptical groove that allows the blade of the lower cutter 3 to extend into the press sleeve 40.

[0029] The second connecting rod 25 is formed with a third groove 25a, and a third shaft sleeve 26 and a fourth shaft sleeve 27 are provided on the second connecting rod 25. The third shaft sleeve 26 is slidably installed on the third groove 25a, and the fourth shaft sleeve 27 is slidably installed on the second connecting rod 25. When the second connecting rod 25 moves up and down, the third shaft sleeve 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 shaft sleeve 27.

[0030] The lower end of the third sleeve 26 is rotatably mounted on the upper end of the second mounting seat 24 through the fourth bearing 28 . The second connecting rod 25 passes through the second mounting seat 24 . 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 sleeve 27 .

[0031] A press-drive cylinder 29 is mounted on one side of the second mounting base 24, and a press-drive seat 30 is located below the second mounting base 24. The cylinder body of the press-drive cylinder 29 is fixedly connected to the second mounting base 24, and the drive rod of the press-drive cylinder 29 is fixedly connected to the press-drive seat 30. The press-drive cylinder 29 drives the press-drive seat 30 downward, and the bottom of the press-drive seat 30 secures the fabric to be cut, keeping the cutting area of the fabric in a tensioned state and preventing wrinkles in the fabric.

[0032] A third motor 31 is provided at the upper end of the second connecting rod 25 to drive the second connecting rod 25 to rotate. The driving shaft of the third motor 31 is rotatably installed with a third gear 32. The fourth gear 33 is installed on the third shaft sleeve 26 of the second connecting rod 25. The second synchronous belt 34 is sleeved on the third gear 32 and the fourth gear 33. The driving shaft of the third motor 31 drives the second connecting rod 25 to rotate through the second synchronous belt 34.

[0033] A second lifting cylinder 35 is provided on one side of the second mounting seat 24 to drive 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. The other end of the third transmission member 36 is slidably installed on the second connecting rod 25. The other end of the third transmission member 36 is fixed to the second connecting rod 25 through a fifth bearing 37.

[0034] In dual-blade mode, the second lift cylinder 35 drives the upper cutter 38 on the second connecting rod 25 downward toward the material to be cut, while the first lift cylinder 21 drives the lower cutter 3 upward toward the material to be cut. The second motor 13 drives the lower cutter 3 to vibrate up and down. During operation, the first motor 9 rotates the lower cutter 3, while the third motor 31 drives the upper cutter 38. The lower cutter 3 and the upper cutter 38 rotate synchronously to cut the material.

[0035] In single-blade mode, the second lift cylinder 35 drives the binder sleeve 40 on the second connecting rod 25 downward toward the material to be cut, while the first lift cylinder 21 drives the lower cutter 3 upward toward the material to be cut. With the binder sleeve 40 securing the material, the second motor 13 drives the blade of the lower cutter 3 to vibrate within the notch of the binder sleeve 40, slicing the material. During operation, the first motor 9 rotates the lower cutter 3, while the third motor 31 synchronously rotates the binder sleeve 40 on the second connecting rod 25, aligning the elliptical notch of the binder sleeve 40 with the direction of the lower cutter 3.

[0036] The second connecting rod 25 can be connected to the upper cutter 38 and the upper cutter mounting seat 39, and can also be connected to the pressing sleeve 40. For fabrics of different materials, the double-knife and single-knife modes can be switched conveniently and quickly to improve work efficiency.

[0037] The best embodiment of the present invention has been described, and various changes or modifications made by ordinary technicians in this field will not depart from the scope of the present invention.

Claims

1. A lower cutter assembly of a cutting mechanism of a sewing machine, comprising a first mounting base (1) mounted below a workbench, characterized in that: The first mounting seat (1) is provided with a first connecting rod (2) capable of axial sliding, and the upper end of the first connecting rod (2) is provided with a lower cutter (3) for cutting fabric; a second motor mounting plate (14) is provided on one side of the first mounting seat (1), and a second motor (13) is provided on one side of the second motor mounting plate (14); the driving shaft of the second motor (13) is connected to the cam (15); the cam (15) is connected to one end of the first crank (17) through the first crankshaft (16), and the other end of the first crank (17) is connected to the second transmission member (18), and the second transmission member (18) is rotatably connected to the first connecting rod (2), and the upper and lower sides of the second transmission member (18) are respectively provided with first clamps (19) fixed on the first connecting rod (2).

2. The lower cutter assembly according to claim 1, wherein: The cam (15) is provided with a first central hole (15a) and a first eccentric hole (15b); the first crankshaft (16) is provided with an eccentric first connecting shaft (16a) and a second connecting shaft (16b); the driving shaft of the second motor (13) is fixedly connected to the first central hole (15a) of the cam (15); the first eccentric hole (15b) of the cam (15) is fixedly connected to the first connecting shaft (16a) of the first crankshaft (16); and the second connecting shaft (16b) of the first crankshaft (16) is rotationally connected to the first crank (17).

3. The lower cutter assembly according to claim 2, wherein: The second motor mounting plate (14) is slidably mounted on one side of the first mounting seat (1); a first lifting cylinder (21) is provided below the second motor mounting plate (14); a cylinder body of the first lifting cylinder (21) is connected to the first mounting seat (1); and a driving rod of the first lifting cylinder (21) is connected to the second motor mounting plate (14).

4. The lower cutter assembly according to claim 3, wherein: The first mounting seat (1) is provided with a rotatable first shaft sleeve (5) through a first bearing (7), and a rotatable second shaft sleeve (6) through a second bearing (8); the first connecting rod (2) is slidably mounted in the first shaft sleeve (5) and the second shaft sleeve (6); the first connecting rod (2) has a first groove (2a) matched with the first shaft sleeve (5), and a second groove (2b) matched with the second shaft sleeve (6); the upper end of the first shaft sleeve (5) is provided with a material support seat (4), and the top plate of the material support seat (4) is provided with a cutting groove (4a) for the lower cutting knife (3) to move up and down.

5. The lower cutter assembly according to claim 4, wherein: A first motor (9) is provided at the bottom of the first mounting seat (1), a first synchronous wheel (10) is provided on the driving shaft of the first motor (9), a second synchronous wheel (11) is provided at the lower end of the second shaft sleeve (6), and a first synchronous belt (12) is sleeved on the first synchronous wheel (10) and the second synchronous wheel (11).

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