CN211689488U

CN211689488U - Thread cutting mechanism of sewing machine

Info

Publication number: CN211689488U
Application number: CN201922501563.XU
Authority: CN
Inventors: 陈英杰; 颜文耀
Original assignee: Zhejiang Maqi Sewing Machine Co Ltd
Current assignee: Zhejiang Maqi Sewing Machine Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-10-16
Anticipated expiration: 2029-12-31

Abstract

The utility model belongs to the technical field of make up equipment, a sewing machine's thread trimming mechanism is related to, it has solved current thread trimming mechanism and has appeared letting the sword easily and lead to the uneven steady scheduling problem of excision vestige. The thread trimming mechanism comprises a cutter frame, a movable cutter shaft is rotatably arranged on the cutter frame, a movable cutter is fixed at one end of the movable cutter shaft, a cutter table is arranged on one side of the cutter table, a cutting edge matched with the movable cutter is arranged on the other side of the cutter table, and a mounting hole is formed in the other side of the cutter table and fixed on the cutter frame through a fastener. When the thread is cut, the movable cutter shaft rotates to drive the movable cutter to swing, the movable cutter is matched with the cutting edge of the cutter platform to cut the thread, when the movable cutter cuts the thread with the cutting edge, the movable cutter can apply certain pressure to the cutting edge surface, and the mounting position of the mounting hole of the cutter platform and the fastening piece are both designed on the other side opposite to the cutting edge and aligned to the force direction of the cutting edge, so that the cutter platform can be effectively prevented from moving to generate cutter relieving, the cutting trace of the cutter is guaranteed to be level and stable, and the attractiveness is improved.

Description

Thread cutting mechanism of sewing machine

Technical Field

The utility model belongs to the technical field of make up equipment, a sewing machine's thread trimming mechanism is related to.

Background

The thread trimming of the overedger is always a difficult problem in the sewing process, the suction thread trimming cutter set has two modes for driving the cutter set, one mode is a traditional mode, and a shifting fork is arranged on a movable cutter of the cutter set and is in transmission connection with a main shaft of the overedger. The overedger operates at a high speed to drive the knife group to move synchronously. A connecting rod is arranged above the moving knife of the second cutter set, a pneumatic element is connected behind the connecting rod, and the pneumatic element moves back and forth to drive the cutter set to move dynamically to complete cutting.

For example, the Chinese patent CN 105586726A discloses an automatic thread trimming device on an overlock machine, the sewing machine comprises a knife rest, a fixed knife mounting seat, a movable knife shaft mounting seat, a fixed knife, a movable knife shaft and a movable knife, wherein a correlation electric eye for detecting whether sewing cloth reaches a designated area or not so as to facilitate the thread cutting action is further arranged on the knife rest at the front end of the fixed knife mounting seat, the knife rest comprises a knife rest bottom plate and a knife rest side plate, the opposite-shooting electric eye comprises an electric eye transmitting end arranged on a knife rest bottom plate and an electric eye receiving end arranged on a knife rest side plate, wherein the distance from the end part of the electric eye receiving end to the knife rest side plate is smaller than the distance from the end part of the electric eye transmitting end to the knife rest side plate, an included angle smaller than 90 degrees is formed between a connecting line between the end part of the electric eye transmitting end and the end part of the electric eye receiving end and the knife rest bottom plate, and the line shearing device further comprises a driving mechanism and a controller, wherein the driving mechanism is used for driving a movable knife shaft to rotate so as to perform line shearing action.

However, the fixed knife is L-shaped, one part of the fixed knife is used as a cutting edge to be matched with the movable knife to realize thread cutting, the other part of the fixed knife is fixed on the knife rest through a screw, when thread cutting is carried out, the cutting edge is stressed, the stress point is inconsistent with the mounting point of the screw, when a thread cutting object is too thick, the fixed knife is easy to loosen, so that knife back is caused, the cutting trace of the cutter is not level and stable, and the integral attractiveness is affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having the above-mentioned problem to current technique, provided a sewing machine's thread trimming mechanism, the utility model aims to solve the technical problem that: how to appear the phenomenon of dodging through avoiding when the trimming to guarantee that the excision vestige of cutter is parallel and level, stable, improve the aesthetic property.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a sewing machine's thread trimming mechanism, thread trimming mechanism includes the knife rest, it is provided with the movable cutter arbor to rotate on the knife rest, the one end of moving the cutter arbor is fixed with moves the sword, a serial communication port, thread trimming mechanism still includes the sword platform, one side of sword platform have with move sword matched with cutting edge, the mounting hole has been seted up to the opposite side of sword platform, the mounting hole is fixed in through the fastener on the knife rest.

The working principle is as follows: when the thread is cut, the movable cutter shaft rotates to drive the movable cutter to swing, the movable cutter is matched with the cutting edge of the cutter platform to cut the thread, when the movable cutter cuts the thread with the cutting edge, the movable cutter can apply certain pressure to the cutting edge surface, and the mounting position of the mounting hole of the cutter platform and the fastening piece are both designed on the other side opposite to the cutting edge and aligned to the force direction of the cutting edge, so that the cutter platform can be effectively prevented from moving to generate cutter relieving, the cutting trace of the cutter is guaranteed to be level and stable, and the attractiveness is improved.

In the thread trimming mechanism of the sewing machine, the number of the mounting holes is two, and the force direction of the cutting edge of the cutter table is perpendicular to a plane formed by the axes of the two mounting holes. Two mounting holes are designed, so that the knife rest can be limited in multiple directions, and the knife rest is further prevented from being forced to move; and the stress direction of the knife rest cutting edge is perpendicular to the plane formed by the axes of the two mounting holes, so that the stress of the two fasteners is more uniform, the service life is prolonged, the connection stability of the knife rest can be improved, and the phenomenon that the stress moves and the knife is retracted is avoided.

In the thread trimming mechanism of the sewing machine, an elastic part capable of applying pretightening force to the movable knife shaft is arranged between the knife rest and the movable knife shaft, the pretightening force is directed towards the cutting edge of the knife rest, and the movable knife shaft can enable the movable knife to be tightly attached to the cutting edge of the knife rest under the pretightening force action of the elastic part. After the elastic piece is designed, the movable knife on the movable knife shaft can be tightly attached to the knife edge of the knife platform, and the gap between the movable knife and the knife platform knife edge is reduced, so that the smoothness and stability of a tangent line are improved.

In the thread trimming mechanism of the sewing machine, the knife rest is provided with two hole grooves at intervals, the movable knife shaft is in running fit with the hole grooves, the elastic part comprises a spring sleeved on the movable knife shaft, and the spring is positioned between the two hole grooves. The spring can provide elastic pretightening force for the movable cutter shaft through the elasticity of the spring, so that the movable cutter on the movable cutter shaft can be tightly attached to the cutting edge of the cutter platform.

In foretell thread trimming mechanism of sewing machine, the knife rest includes mounting panel one, mounting bracket and mounting panel two, the mounting bracket is fixed in on the mounting panel one, move the cutter arbor and all set up on the mounting bracket with the sword platform, mounting panel two links firmly with the mounting bracket mutually.

In the thread trimming mechanism of the sewing machine, the air suction opening is formed below the first mounting plate.

In the thread trimming mechanism of the sewing machine, the first inductor is arranged on the mounting frame, the second inductor corresponding to the first inductor is arranged on one side of the knife rest, and the second inductor is flush with the edge of the mounting frame. The first sensor and the second sensor are designed and can be used for detecting whether the cloth reaches a designated area; the second inductor and the knife platform are separately installed, so that the knife platform can directly receive the limiting effect of the fastener, and the stability of trimming is further improved.

In the thread trimming mechanism of the sewing machine, the mounting frame is provided with the baffle, and one end of the baffle is abutted to the mounting plate in three phases. The knife rest is designed as above, the structure is simple, the installation is convenient and labor-saving, the occupied space is small, and the overall aesthetic property is better.

Compared with the prior art, the utility model has the advantages of it is following:

1. the mounting hole and the fastener of the cutter platform are both designed on the other side opposite to the cutting edge, and the mounting position of the mounting hole and the fastener is aligned with the stress direction of the cutting edge, so that cutter back-off caused by movement of the cutter platform can be effectively avoided, the cutting trace of the cutter is ensured to be flush and stable, and the attractiveness is improved;

2. the knife rest has the advantages of simple structure, convenient and labor-saving installation, small occupied space and better overall aesthetic property.

Drawings

Fig. 1 is a schematic structural view of one side of the present thread trimming mechanism.

Fig. 2 is a schematic structural view of the other side of the thread trimming mechanism.

In the figure, 1, a tool holder; 2. a movable cutter shaft; 3. moving a knife; 4. a tool post; 5. mounting holes; 6. A fastener; 7. a spring; 8. a first mounting plate; 9. a mounting frame; 10. a second mounting plate; 11. An air suction opening; 12. a first inductor; 13. a second inductor; 14. a baffle plate; 15. and a third mounting plate.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the thread cutting mechanism comprises a cutter frame 1, a movable cutter shaft 2 is rotatably arranged on the cutter frame 1, and a movable cutter 3 is fixed at one end of the movable cutter shaft 2.

Specifically, in this embodiment, the knife rest 1 includes a first mounting plate 8, a second mounting plate 9 and a second mounting plate 10, the first mounting plate 8 is fixed to the mounting plate 9, the moving blade shaft 2 is arranged on the mounting plate 9, and the second mounting plate 10 is fixedly connected to the mounting plate 9; an air suction opening 11 is formed below the first mounting plate 8. The mounting frame 9 is provided with a first inductor 12, one side of the knife rest 4 is provided with a second inductor 13 corresponding to the first inductor 12, and the second inductor 13 is flush with the edge of the mounting frame 9. A baffle plate 14 is arranged on the mounting frame 9, and one end of the baffle plate 14 is abutted against the third mounting plate 15.

As shown in fig. 1 and 2, the thread trimming mechanism further includes a tool post 4, a cutting edge matching with the movable tool 3 is provided on one side of the tool post 4, a mounting hole 5 is provided on the other side of the tool post 4, the mounting hole 5 is fixed on the tool rest 1 through a fastener 6, in this embodiment, the tool post 4 is preferably arranged on a mounting frame 9

Preferably, in the embodiment, the number of the mounting holes 5 is two, and the force-bearing direction of the cutting edge of the tool post 4 is perpendicular to the plane formed by the axes of the two mounting holes 5.

Of course, as other solutions, the number of the mounting holes 5 may also be designed as a single or multiple, and the cross-sectional shape may be circular, square or other shapes; the fastening 6 can be designed as a screw or the like.

As shown in fig. 1, in order to further reduce the cutter gap during cutting, an elastic member capable of applying a pre-tightening force to the movable cutter shaft 2 is disposed between the cutter holder 1 and the movable cutter shaft 2, the pre-tightening force is directed toward the cutting edge of the cutter platform 4, and the movable cutter shaft 2 can make the movable cutter 3 tightly contact the cutting edge of the cutter platform 4 under the pre-tightening force of the elastic member.

Preferably, the knife rest 1 is provided with two hole grooves at intervals, the movable knife shaft 2 is in running fit with the hole grooves, the elastic part comprises a spring 7 sleeved on the movable knife shaft 2, and the spring 7 is positioned between the two hole grooves.

The working principle of the utility model is as follows: when cutting the thread, the movable cutter shaft 2 rotates to drive the movable cutter 3 to swing, the movable cutter 3 is matched with the cutting edge of the cutter platform 4 to cut the thread, when the movable cutter 3 cuts the thread with the cutting edge, the movable cutter 3 can apply certain pressure to the cutting edge surface, and the mounting hole 5 and the fastening piece 6 of the cutter platform 4 are both designed at the other side opposite to the cutting edge, the mounting position of the mounting hole is aligned with the force direction of the cutting edge, so that the cutter platform 4 can be effectively prevented from moving to cause cutter relieving, the cutting trace of the cutter is ensured to be parallel and level and stable, and the attractiveness is improved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a sewing machine's thread trimming mechanism, thread trimming mechanism includes knife rest (1), it is provided with moves sword axle (2) to rotate on knife rest (1), the one end that moves sword axle (2) is fixed with moves sword (3), a serial communication port, thread trimming mechanism still includes sword platform (4), one side of sword platform (4) have with move sword (3) matched with cutting edge, mounting hole (5) have been seted up to the opposite side of sword platform (4), mounting hole (5) are fixed in through fastener (6) on knife rest (1).

2. The thread trimming mechanism of a sewing machine according to claim 1, wherein the number of the mounting holes (5) is two, and the force direction of the blade of the knife table (4) is perpendicular to the plane formed by the axes of the two mounting holes (5).

3. The thread trimming mechanism of a sewing machine according to claim 2, characterized in that an elastic member capable of applying a pre-tightening force to the movable knife shaft (2) is arranged between the knife rest (1) and the movable knife shaft (2), the pre-tightening force is directed towards the knife edge of the knife platform (4), and the movable knife shaft (2) can enable the movable knife (3) to be tightly attached to the knife edge of the knife platform (4) under the pre-tightening force of the elastic member.

4. The thread trimming mechanism of a sewing machine according to claim 3, wherein the knife rest (1) is provided with two hole slots at intervals, the movable knife shaft (2) is rotatably matched with the hole slots, the elastic member comprises a spring (7) sleeved on the movable knife shaft (2), and the spring (7) is positioned between the two hole slots.

5. The thread trimming mechanism of a sewing machine according to claim 4, wherein the knife rest (1) comprises a first mounting plate (8), a mounting frame (9) and a second mounting plate (10), the mounting frame (9) is fixed on the first mounting plate (8), the movable knife shaft (2) and the knife table (4) are both arranged on the mounting frame (9), and the second mounting plate (10) is fixedly connected with the mounting frame (9).

6. The thread trimming mechanism for sewing machines according to claim 5, characterized in that an air suction opening (11) is provided below the mounting plate I (8).

7. The thread trimming mechanism for sewing machines according to claim 5, characterized in that the mounting frame (9) is provided with a first sensor (12), one side of the knife table (4) is provided with a second sensor (13) corresponding to the first sensor (12), and the second sensor (13) is flush with the edge of the mounting frame (9).

8. The thread trimming mechanism for sewing machines according to claim 7, characterized in that the mounting frame (9) is provided with a flap (14), one end of the flap (14) abutting against the mounting plate three (15).