CN201058911Y - Thread cutting tool of sewing machine - Google Patents

Abstract

The utility model discloses a thread cutting tool for a sewing machine, which is characterized in that the tool comprises a knife seat, a knife shaft is installed through the knife seat, shaft sleeves are installed at both ends of the knife shaft, a fixed knife is installed at one end of the knife seat, a movable knife is installed at one end of the knife shaft, a sewing thread can pass through the space between the blades of the fixed knife and the movable knife, and a rotating arm for driving the knife shaft to rotate is fixedly installed at the other end of the knife shaft; the utility model can be installed vertically in the processing direction of the material, and the sewing thread can be directly cut, so there is no need to bend the sewing thread, thereby reducing the sewing thread to be cut, and correspondingly saving the sewing thread, and can cut elastic bands, rubber bands and other materials that are relatively difficult to bend.

Description

Thread cutter for sewing machine

technical field

The utility model relates to a thread cutting tool, in particular to a thread cutting tool applied to a sewing machine.

Background technique

Existing sewing machines driven by electricity are equipped with thread trimming devices. The shearing driving force and sewing power of the currently used thread trimming devices are derived from the same driving device, so the moving knife and the sewing machine are constantly moving together, and the The moving knife is in idle running state most of the time, which makes the moving knife wear out quickly, thereby reducing the service life of the blade; meanwhile, the thread cutting tool of this thread trimming device can only be installed on one side of the sewing line, and the cutting tool can only be installed on one side of the sewing line. When threading the thread, the sewing thread needs to be sucked to the thread cutting tool through the suction device, so the sewing thread must be bent to a certain length before it can be cut, resulting in waste of sewing thread; and this thread cutting tool cannot cut elastic bands, Relatively difficult to bend materials such as elastic.

Contents of the invention

In order to overcome the deficiencies of the prior art, the utility model provides a shearing tool applied to the thread trimming device of the sewing machine, which can be installed vertically in the processing direction of the material, so that the sewing thread can be directly cut , and can cut relatively difficult-to-bend materials such as elastic bands and elastic bands.

The technical scheme that the utility model solves its technical problem adopts is:

A sewing machine thread cutting tool, characterized in that the tool includes a knife seat, a knife shaft is installed through the knife seat, bushings are installed at both ends of the knife shaft, a fixed knife is installed at one end of the knife seat, and a fixed knife is installed at one end of the knife shaft. There is a moving knife, and the sewing line can pass through the space between the fixed knife and the blade of the moving knife, and the other end of the knife shaft is fixedly installed with a rotating arm that drives the knife shaft to rotate.

The end of the rotating arm away from the cutter shaft is provided with a small shaft that can be connected with external driving power.

The beneficial effect of the utility model is: the utility model can be vertically installed in the processing direction of the material, and can directly cut the sewing thread, so that there is no need to bend the sewing thread, so that the cut sewing thread can be reduced , the sewing line is saved correspondingly, and materials that are relatively difficult to bend such as elastic bands and elastic bands can be cut; the utility model is driven by an external power different from the sewing power, so that the shearing driving force is separated from the sewing power , The moving knife only moves when cutting the thread, so it can avoid the long-term idle running state of the moving knife, so as to reduce the wear of the blade and greatly improve the service life of the blade.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a three-dimensional exploded schematic diagram of the utility model.

Detailed ways

Referring to Fig. 1 , a sewing machine thread trimmer disclosed by the utility model includes a knife seat 1, a shaft hole 2 is arranged in the knife seat 1, a shaft sleeve 3 is installed at both ends of the shaft hole 2, and a knife is installed in the shaft hole 2 Shaft 4, the two ends of cutter shaft 4 are installed in the shaft sleeve 3, fixed knife 7 is installed by screw 5 and pin 6 at one end of knife holder 1, and movable knife 8 is installed at one end of cutter shaft 4, and sewing thread can be Through the space between the blades of the fixed knife 7 and the moving knife 8, the other end of the knife shaft 4 is fixedly mounted with a rotating arm 9 that drives the knife shaft 4 to rotate, and the rotating arm 9 is provided with a small shaft 10 that can be connected with an external driving power .

Under normal circumstances, a downward force is applied to the small shaft end of the rotating arm, so that the rotating arm swings downward, so that the moving knife swings upward through the knife shaft, so that the shearing knife is opened, and materials such as cloth, sewing thread, and elastic band It passes vertically between the fixed knife and the moving knife; when a piece of fabric needs to be trimmed (including the elastic band) after sewing, an upward force is applied to the small shaft end of the rotating arm to make the rotating arm swing upwards, thereby passing through the knife shaft. The moving knife swings downward, the moving knife and the fixed knife are closed, and the sewing thread, elastic band and other materials are cut off, and an action cycle is completed at this time.

The utility model can adopt various driving powers, and the utility model is suitable for various sewing machines of different models.

Claims (2)

1. Sewing machines trimming cutter, it is characterized in that this cutter comprises a tool rest, connect in the tool rest cutter shaft is installed, the two ends of cutter shaft are equipped with axle sleeve, one end of tool rest is equipped with stationary knife, end at cutter shaft is equipped with moving knife, and sewing line can be by the space between the blade of stationary knife and moving knife, and the other end of cutter shaft is installed with and drives the pivoted arm that cutter shaft rotates.

2. a kind of Sewing machines trimming cutter according to claim 1 is characterized in that described pivoted arm is provided with the little axle that can connect with external drive power away from an end of cutter shaft.