Thread trimming device with simple structure

Abstract

The utility model provides a trimming device with a simple structure, which comprises a trimming mechanism, the trimming mechanism comprises scissors, a driving motor and a connecting rod assembly, the scissors comprise a first scissors and a second scissors which are hinged with each other, and one end of the first scissors is provided with a first transmission rod; a second transmission rod is arranged at one end of the second scissors, the connecting rod assembly comprises a driving arm arranged on the driving motor and a push rod capable of pushing the first transmission rod and the second transmission rod to reciprocate so as to drive the scissors to trim threads, and one end of the first transmission rod is rotationally connected with the first scissors; the second transmission rod is rotatably connected with the second scissors, and the other end of the first transmission rod and the other end of the second transmission rod are rotatably connected to the push rod. The thread trimming device is simple in structure and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing, in particular to a thread trimming device with a simple structure. Background Art

[0002] Existing sewing machines are generally provided with a thread trimming device, which includes scissors and a thread trimming driving mechanism for driving the scissors to cut the thread. The existing scissors also include a fixed knife and a movable knife. The movable knife is usually driven to move in coordination with the fixed knife to cut the thread. A plurality of connecting rods are arranged between the thread trimming driving mechanism and the movable knife to drive the movable knife to move. The overall structure is complex, the cost is high, and it is difficult to install and maintain. Utility Model Content

[0003] In order to solve the above problems of the prior art, the utility model provides a wire trimming device with simple structure and low cost.

[0004] The technical solutions adopted are as follows:

[0005] A wire cutting device with a simple structure comprises a wire cutting mechanism, wherein the wire cutting mechanism comprises scissors, a driving motor and a connecting rod assembly, wherein the scissors comprise a first scissors and a second scissors hinged to each other, a first transmission rod is provided at one end of the first scissors, a second transmission rod is provided at one end of the second scissors, the connecting rod assembly comprises a driving arm provided on the driving motor, and a push rod which can push the first and second transmission rods to reciprocate and thus drive the scissors to cut the wire, one end of the first transmission rod is rotatably connected to the first scissors, the second transmission rod is rotatably connected to the second scissors, and the other ends of the first and second transmission rods are rotatably connected to the push rod.

[0006] Furthermore, the first and second scissors are hinged in the middle, and the first and second scissors have a cutting blade on one side close to the machine head and a driving part on the other side away from the machine head.

[0007] Furthermore, the first and second transmission rods are arranged on the same rotating pin of the push rod.

[0008] Furthermore, the driving motor is arranged on a motor mounting plate.

[0009] Furthermore, a reset spring capable of resetting the push rod is provided between the motor mounting plate and the push rod.

[0010] Furthermore, an extension block is provided on the motor mounting plate, and the first and second scissors are hinged on the extension block.

[0011] Furthermore, the thread trimming mechanism is also provided with a driving mechanism for driving the thread trimming mechanism to enter or move away from a working position.

[0012] Furthermore, the driving mechanism includes a cylinder assembly, a mounting plate for mounting the cylinder assembly, and a connecting plate connected to the driving motor, and a slide rail assembly is provided between the mounting plate and the connecting plate.

[0013] Furthermore, the slide rail assembly includes a slider arranged on the connecting plate and a slide rail arranged on the mounting plate.

[0014] Compared with the prior art, the beneficial effects produced by the utility model are:

[0015] The utility model provides a wire trimming device with a simple structure, comprising a wire trimming mechanism, wherein a pair of scissors for wire trimming are arranged on the wire trimming mechanism, and the scissors comprise a first pair of scissors and a second pair of scissors, wherein one end of the first pair of scissors is rotatably connected to a first transmission rod; one end of the second pair of scissors is rotatably connected to a second transmission rod, and the other ends of the two transmission rods are rotatably connected to a push rod, which is connected to a driving arm, and the driving arm is arranged on an output shaft of a driving motor, and the driving arm drives the push rod to reciprocate, so that the first transmission rod drives the first scissors to move; the second transmission rod drives the second scissors to move, and the first and second scissors can move relative to each other to complete an opening and closing wire trimming movement, and the wire trimming effect is better. At the same time, the utility model has a simple structure, and requires fewer components to be installed, so the cost is low, and it is more convenient to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of the utility model from one angle;

[0017] Figure 2 This is a structural schematic diagram of the utility model from another angle;

[0018] Among them, the scissors 1, the first scissors 101, the second scissors 102, the thread cutting mechanism 2, the driving motor 3, the connecting rod assembly 4, the driving arm 401, the push rod 402, the transmission rod 5, the first transmission rod 501, the second transmission rod 502, the motor mounting plate 6, the return spring 7, the extension block 8, the driving mechanism 9, the cylinder assembly 901, the mounting plate 902, the connecting plate 903, the slide rail assembly 10, the slider 1001, the slide rail 1002, the blade 11, and the driving part 12. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with specific embodiments.

[0020] refer to Figure 1 , 2A thread trimming device with a simple structure includes a thread trimming mechanism 2, wherein the thread trimming mechanism 2 includes scissors 1, a driving motor 3 and a connecting rod assembly 4, wherein the scissors 1 include a first scissors 101 and a second scissors 102 which are hinged to each other, wherein a first transmission rod 501 is provided at one end of the first scissors; a second transmission rod 502 is provided at one end of the second scissors 102, wherein the connecting rod assembly 4 includes a driving arm 401 provided on the driving motor 3, and a push rod 402 which can push the first and second transmission rods to reciprocate and thereby drive the scissors 1 to cut the thread, wherein one end of the first transmission rod 501 is rotatably connected to the first scissors 102; the second transmission rod 502 is rotatably connected to the second scissors 102, and the other ends of the first and second transmission rods are rotatably connected to the push rod 402.

[0021] The first and second scissors are hinged in the middle, and the first and second scissors are close to the machine head for cutting the thread. The side away from the machine head is a driving part 12 for driving the cutting. The thread passes between the first and second scissors, and the scissors are closed to realize the cutting action.

[0022] One end of the two transmission rods is rotatably connected to the corresponding scissors 1, and the other end is rotatably connected to the end of the push rod 402. Preferably, the first and second transmission rods are arranged on the same rotating pin of the push rod 402. Therefore, a parallelogram is formed between the scissors 1 and the first and second transmission rods. The first transmission rod drives the first scissors to move; the second transmission rod drives the second scissors to move, so that the first and second scissors move relative to each other, so that the scissors 1 can be opened or closed. When the push rod moves toward the machine head, the scissors 1 are opened under the drive of the first and second transmission rods; when the push rod 402 moves away from the machine head, the scissors 1 are closed under the drive of the first and second transmission rods.

[0023] The driving motor 3 is arranged on the motor mounting plate 6. A reset spring 7 is arranged between the motor mounting plate 6 and the push rod 402 to reset the push rod 402. The driving motor 3 drives the driving arm 401 to rotate. One end of the push rod 402 is arranged on the driving arm 401. When the driving arm 401 rotates, the push rod 402 is driven to move, thereby driving the first and second transmission rods to drive the scissors 1 to open or close. The driving motor 3 only needs to drive the push rod 402 to move toward the machine head. Under the action of the reset spring, the push rod 402 will reset and move away from the machine head.

[0024] The motor mounting plate 6 is provided with an extension block 8, and the first and second scissors are hinged on the extension block 8. The first and second scissors are rotatably connected to the extension block 8.

[0025] The thread trimming mechanism 2 is also provided with a driving mechanism 9 for driving the thread trimming mechanism 2 to enter or leave the working position. The driving mechanism 9 includes a cylinder assembly 901, a mounting plate 902 for mounting the cylinder assembly, and a connecting plate 903 for connecting the driving motor 3. A slide rail assembly 10 is provided between the mounting plate 902 and the connecting plate 903.

[0026] The slide rail assembly 10 comprises a slider 1001 disposed on the connecting plate 903 and a slide rail 1002 disposed on the mounting plate 902. The cylinder assembly 901 is generally fixed on the machine head, and the cylinder assembly 901 can drive the slider 1001 to move along the slide rail 1002. Since the slider 1001 is connected to the connecting plate 903, and the connecting plate 903 is disposed on the thread trimming mechanism 2, the thread trimming mechanism 2 will move to the working position to complete the thread trimming action under the drive of the cylinder assembly 901, and then move away from the working position after the thread trimming is completed to prevent it from affecting sewing.

[0027] The utility model uses scissors to replace the traditional movable knife and fixed knife, and drives the scissors to open and close through the transmission rod 5. The connecting rod assembly used only includes the driving arm 401 and the push rod 402. The structure of the entire thread cutting mechanism is simpler, the cost is lower, and the stability is better.

[0028] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A thread trimming device with a simple structure, comprising a thread trimming mechanism (2), wherein the thread trimming mechanism (2) comprises a pair of scissors (1), a drive motor (3) and a connecting rod assembly (4), characterized in that: The scissors (1) comprise a first pair of scissors (101) and a second pair of scissors (102) which are hinged to each other, a first transmission rod (501) being provided at one end of the first pair of scissors; a second transmission rod (502) being provided at one end of the second pair of scissors (102); the connecting rod assembly (4) comprises a driving arm (401) provided on a driving motor (3) and a push rod (402) which can push the first and second transmission rods to reciprocate and thereby drive the scissors (1) to cut the thread; one end of the first transmission rod is rotatably connected to the first pair of scissors; The second transmission rod is rotatably connected to the second scissors, and the other ends of the first and second transmission rods are rotatably connected to the push rod (402).

2. The simple-structured thread trimming device according to claim 1, characterized in that: The first and second scissors are hinged in the middle, and the side of the first and second scissors close to the machine head is a cutting blade (11), and the side away from the machine head is a driving part (12) for driving the cutting.

3. The simple-structured thread trimming device according to claim 1, characterized in that: The first and second transmission rods are arranged on the same rotating pin of the push rod (402).

4. The simple-structured thread trimming device according to claim 1, characterized in that: The driving motor (3) is arranged on the motor mounting plate (6).

5. The simple-structured thread trimming device according to claim 4, characterized in that: A return spring (7) is provided between the motor mounting plate (6) and the push rod (402) for returning the push rod (402).

6. The simple-structured thread trimming device according to claim 4, characterized in that: An extension block (8) is provided on the motor mounting plate (6), and the first and second scissors are hinged on the extension block (8).

7. The simple-structured thread trimming device according to claim 1, characterized in that: The thread cutting mechanism (2) is also provided with a driving mechanism (9) for driving the thread cutting mechanism (2) to enter or move away from a working position.

8. The simple-structured thread trimming device according to claim 7, characterized in that: The driving mechanism (9) comprises a cylinder assembly (901), a mounting plate (902) for mounting the cylinder assembly, and a connecting plate (903) connected to a driving motor (3); a slide rail assembly (10) is provided between the mounting plate (902) and the connecting plate (903).

9. The simple-structured thread trimming device according to claim 8, characterized in that: The slide rail assembly (10) comprises a sliding block (1001) provided on a connecting plate (903) and a slide rail (1002) provided on a mounting plate (902).

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