CN218910770U

CN218910770U - Automatic thread cutting mechanism and sewing machine

Info

Publication number: CN218910770U
Application number: CN202121278071.XU
Authority: CN
Inventors: 蒋达淼; 任恩林; 杨开胜
Original assignee: Zhejiang Qishi Electromechanical Technology Co ltd
Current assignee: Zhejiang Qishi Electromechanical Technology Co ltd
Priority date: 2021-06-08
Filing date: 2021-06-08
Publication date: 2023-04-25
Anticipated expiration: 2031-06-08

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to an automatic thread cutting mechanism and a sewing machine, wherein the automatic thread cutting mechanism comprises a motor, a rotatable output shaft is arranged in the motor, one end of the output shaft extends out of the motor and is provided with a driving wheel, one side of the driving wheel is provided with a thread cutting connecting rod assembly for executing thread cutting action, a driving curved surface is formed on the side surface of the driving wheel, a driving pin shaft is arranged on the end surface of the driving curved surface, and the driving pin shaft is connected with the thread cutting connecting rod assembly; the driving curved surface comprises a first working surface and a second working surface, when the driving wheel rotates, the driving pin shaft moves from the second working surface to the first working surface or from the first working surface to the second working surface, the driving pin shaft can be driven to move at the moment, and the line cutting assembly can execute line cutting action to produce and manufacture conveniently through the line cutting connecting rod assembly, so that the cost is lower, and mass production and manufacture are facilitated.

Description

Automatic thread cutting mechanism and sewing machine

Technical Field

The utility model relates to the technical field of sewing machines, in particular to an automatic thread cutting mechanism and a sewing machine.

Background

At present, an automatic thread cutting mechanism is generally arranged on a sewing machine and is used for realizing the action of automatic thread cutting, so that the time is saved, the labor force is reduced, and the working efficiency is improved.

The sewing machine and the automatic thread cutting mechanism disclosed in the patent number CN201822006245.1 comprise a thread cutting transmission mechanism, a cutter, a fixed cutter, a motor and a thread cutting cam driven by the motor to rotate, wherein the front side surface of the thread cutting cam is provided with a moving track, the moving track comprises a thread cutting part and an idle stroke part, the thread cutting transmission mechanism is arranged in the moving track through a roller and is connected with the thread cutting cam, the action of the motor is controlled by a controller, and the motor drives the cutter to rotate through the thread cutting transmission mechanism to be matched with the fixed cutter to cut threads.

The thread cutting mechanism is controlled by the movement of the roller in the movement track, the movement track is formed by combining the cam and the circular ring at the periphery, the structure is complex, the disassembly and assembly are inconvenient, and the production and manufacturing cost are high, so that the structure is further improved.

Disclosure of Invention

The utility model aims to provide an automatic thread cutting mechanism and a sewing machine, which solve the problem of duplication of the existing thread cutting cam structure by driving a curved surface.

The purpose of the utility model is realized in the following way: the automatic wire cutting mechanism comprises a motor, a rotatable output shaft is arranged in the motor, one end of the output shaft extends out of the motor and is provided with a driving wheel, one side of the driving wheel is provided with a wire cutting connecting rod assembly for executing wire cutting action, the side surface of the driving wheel is formed with a driving curved surface, the end surface of the driving curved surface is provided with a driving pin shaft, and the driving pin shaft is connected with the wire cutting connecting rod assembly;

the driving curved surface comprises a first idle stroke surface and a second idle stroke surface, the driving wheel rotates, and the driving pin shaft executes a thread cutting action when moving from the second idle stroke surface to the first idle stroke surface or from the first idle stroke surface to the second idle stroke surface.

Preferably, a limiting block is arranged at the end part of the output shaft, and a cavity for the driving pin shaft to move is formed between the limiting block and the driving curved surface.

Preferably, the limiting block is detachably mounted on the periphery of the output shaft, and a fixing hole for the fastener to pass through is formed in the periphery of the limiting block.

Preferably, the limiting block and the driving wheel are integrally formed.

Preferably, a plane bearing is arranged between the driving wheel and the end face of the motor.

Preferably, the wire cutting connecting rod assembly comprises a long rocker arm, the upper end of the long rocker arm is provided with the driving pin shaft, the middle part of the long rocker arm is hinged with a rocker arm fixing plate, the other end of the rocker arm fixing plate is connected with the casing, the lower end of the long rocker arm is hinged with a short rocker arm, the other end of the short rocker arm is hinged with a crank, and the other end of the crank is connected with the wire cutting assembly.

Preferably, a spring for resetting the wire cutting connecting rod assembly is arranged on the wire cutting connecting rod assembly.

Another object of the present utility model is to provide a sewing machine, comprising the automatic thread cutting mechanism as described above, the present utility model has the technical effects that:

according to the utility model, through the design of the driving curved surface and the driving pin shaft, the driving pin shaft is connected with the wire cutting connecting rod assembly, the wire cutting connecting rod assembly is connected with the wire cutting assembly, when the driving wheel rotates, the driving pin shaft moves from the idle stroke surface II to the idle stroke surface I or from the idle stroke surface I to the idle stroke surface II, at the moment, the driving pin shaft moves, and the wire cutting connecting rod assembly enables the wire cutting assembly to execute the wire cutting action, so that the wire cutting assembly is convenient to produce and manufacture, has low cost and is beneficial to mass production and manufacture

Drawings

Fig. 1 is a schematic structural diagram of the present utility model.

Fig. 2 is a schematic view of the structure of the driving wheel and the long rocker arm.

Fig. 3 is a schematic structural view of the driving wheel.

Fig. 4 is a schematic structural diagram of the second embodiment of the present utility model.

Fig. 5 is a schematic diagram of a driving wheel.

Reference numerals: 1-an output shaft; 2-an electric motor; 3-a cavity; 4-a fastener; 5-a wire cutting assembly;

6-fixing holes; 8-plane bearings; 9-limiting blocks; 10-driving wheels; 12-driving curved surface; 13-a spring; 30-a wire cutting link assembly; 31-driving a pin shaft; 32-long rocker arms; 33-a rocker arm fixing plate; 34-short rocker arms; 35-crank; 121-first idle stroke surface; 122-idle stroke surface two; 123-a curved surface of a shear line.

Detailed Description

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings.

As shown in fig. 1, an automatic wire cutting mechanism comprises a motor 2, wherein a rotatable output shaft 1 is arranged in the motor 2, one end of the output shaft 1 extends out of the motor 2 and is provided with a driving wheel 10, the driving wheel 10 rotates clockwise or anticlockwise by 360 degrees along with the rotation of the motor 2, one side of the driving wheel 10 is provided with a wire cutting connecting rod assembly 30 for executing wire cutting action, the side surface of the driving wheel 10 is formed with a driving curved surface 12, the end surface of the driving curved surface 12 is provided with a driving pin shaft 31, the driving pin shaft 31 is connected with the wire cutting connecting rod assembly 30, and the wire cutting connecting rod assembly 30 is connected with a wire cutting assembly 5;

referring to fig. 2 and 5, the driving curved surface 12 includes a first idle running surface 121, a second idle running surface 122, and a wire cutting curved surface 123 disposed therebetween, and the driving wheel 10 rotates, so that when the driving pin 31 moves from the second idle running surface 122 to the first idle running surface 121 or from the first idle running surface 121 to the second idle running surface 122, that is, when the driving pin passes through the wire cutting curved surface 123, the driving pin 31 moves, and the wire cutting assembly 5 performs a wire cutting action through the wire cutting connecting rod assembly 30.

Referring to fig. 3 and 5, a limiting block 9 is disposed at an end of the output shaft 1, which can limit the movement position of the driving pin shaft 31, prevent the position deviation of the driving pin shaft 31 from separating from the driving wheel 10, and a cavity 3 for moving the driving pin shaft 31 is formed between the limiting block 9 and the driving curved surface 12.

In combination with fig. 2 and fig. 3, the limiting block 9 may be a single component, and is detachably mounted on the periphery of the output shaft 1 through a fastener, and the periphery of the limiting block 9 is provided with a fixing hole 6 through which the fastener 4 passes.

Referring specifically to fig. 5, the limiting block 9 and the driving wheel 10 may be integrally formed, so that no assembly is required between the two components, and the assembly process is reduced.

The planar bearing 8 is arranged between the driving wheel 10 and the end face of the motor 2, so that the stability of the driving wheel 10 during rotation can be improved.

The wire cutting link assembly 30 comprises a long rocker arm 32, the upper end of the long rocker arm 32 is provided with the driving pin shaft 31, the middle part of the long rocker arm 32 is hinged with a rocker arm fixing plate 33, the other end of the rocker arm fixing plate 33 is connected with a casing, the lower end of the long rocker arm 32 is hinged with a short rocker arm 34, the other end of the short rocker arm 34 is hinged with a crank 35, the other end of the crank 35 is connected with the wire cutting assembly 5, and particularly, when the driving pin shaft 31 passes through the driving curved surface 12, the long rocker arm 32 is pulled to move through the short rocker arm 34, particularly, when the driving pin shaft 31 passes through the driving curved surface 12, the long rocker arm 32 is driven to rotate, and the crank 35 is driven to move through the short rocker arm 34, and the crank 35 is fixedly connected with a wire cutting shaft 36 of the wire cutting assembly 5, so that the scissors execute the wire cutting action.

The wire cutting connecting rod assembly 30 is provided with a spring 13 for resetting the wire cutting connecting rod assembly, the structure of the spring 13 is a torsion spring, and the spring 13 is a tension spring, and is arranged at one end of the short rocker arm 34, so that the automatic resetting of the wire cutting assembly 5 can be realized, as shown in fig. 1, and the hinge point in the middle of the long rocker arm 32 is provided.

The automatic thread cutting mechanism of the utility model can be suitable for various sewing machines.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The automatic wire cutting mechanism is characterized by comprising a motor (2), wherein a rotatable output shaft (1) is arranged in the motor (2), one end of the output shaft (1) extends out of the motor (2) and is provided with a driving wheel (10), one side of the driving wheel (10) is provided with a wire cutting connecting rod assembly (30) for executing wire cutting action, the side surface of the driving wheel (10) is provided with a driving curved surface (12), the end surface of the driving curved surface (12) is provided with a driving pin shaft (31), and the driving pin shaft (31) is connected with the wire cutting connecting rod assembly (30);

the driving curved surface (12) comprises a first idle stroke surface (121), a second idle stroke surface (122) and a line shearing curved surface (123) arranged between the first idle stroke surface and the second idle stroke surface, the driving wheel (10) rotates, and the line shearing action is executed when the driving pin shaft (31) moves from the second idle stroke surface (122) to the first idle stroke surface (121) or from the first idle stroke surface (121) to the second idle stroke surface (122); the end part of the output shaft (1) is provided with a limiting block (9), and a cavity (3) for the driving pin shaft (31) to move is formed between the limiting block (9) and the driving curved surface (12).

2. The automatic wire cutting mechanism of claim 1, wherein: the limiting block (9) is detachably arranged on the periphery of the output shaft (1), and a fixing hole (6) for the fastener (4) to pass through is formed in the periphery of the limiting block (9).

3. The automatic wire cutting mechanism of claim 2, wherein: the limiting block (9) and the driving wheel (10) are integrally formed.

4. The automatic wire cutting mechanism of claim 1, wherein: a plane bearing (8) is arranged between the driving wheel (10) and the end face of the motor (2).

5. The automatic wire cutting mechanism of claim 1, wherein: the wire cutting connecting rod assembly (30) comprises a long rocker arm (32), the upper end of the long rocker arm (32) is provided with the driving pin shaft (31), the middle part of the long rocker arm (32) is hinged with a rocker arm fixing plate (33), the other end of the rocker arm fixing plate (33) is connected with the machine shell, the lower end of the long rocker arm (32) is hinged with a short rocker arm (34), the other end of the short rocker arm (34) is hinged with a crank (35), and the other end of the crank (35) is connected with the wire cutting assembly (5).

6. The automatic wire cutting mechanism of claim 5, wherein: the wire cutting connecting rod assembly (30) is provided with a spring (13) for resetting the wire cutting connecting rod assembly.

7. A sewing machine, characterized in that: comprising an automatic thread cutting mechanism according to any one of claims 1-6.