KR20220145100A - The rotary scissors powered by a roller - Google Patents

Abstract

Scissors were being used conveniently. However, according to the present invention, scissors are designed with the goal of improving cutting power, operability, and safety that requires further improvement. A method used to improve the cutting power rotates a scissor blade at a speed faster than that at which a material enters when rotating the scissor blade, to cut the material before pressing the material with pressure as in existing scissors, thereby improving the cutting power. The method further protrudes an edge portion of the rotating scissor blade toward a side thereof to contact another scissor blade, in order to minimize the contact area between the scissor blades. In terms of the operability, if users simply roll a roller over the material, the material is cut so that the cutting speed is fast. As the scissors have no need for an additional hand motion, the scissors can cut the material without misaligning the material, thereby being useful for precise cutting. In terms of the safety, the material can have the rounded scissor blade not exposed long and have a housing provided on the edge thereof to minimize the exposure of the scissor blade, thereby being advantageous for use as a work tool for children.

Description

{ The rotary scissors powered by a roller}

Scissors designed to easily cut materials that are difficult to process with scissors because they are relatively difficult to cut by further improving cutting power by operating the shears blade to make cutting possible in the traditional cutting method of general scissors.

Scissors are simple and convenient, and have been used in a similar shape since their invention, but still three parts remain where they can be further improved. First of all, if you change the traditional method of cutting by pressing the scissors to the cutting target to the method of cutting and cutting by moving the blade as if cutting food with a kitchen knife, the cutting force compared to pressure increases. When the cutting force compared to pressure increases, it becomes easier to cut special materials such as fibers and films with high flexibility and high elasticity that are difficult to cut with scissors in general, and it enables more precise cutting in general cutting, making it easier to cut than general scissors for industrial as well as craft production. Usability can be increased. Cutter machines with rotating blades provide this cutting function, but have two fundamental problems. One is that the high-speed rotation of the blade repeatedly cuts the same area, causing unnecessary grain of the blade, and the friction with the rotating blade continues to damage the material. There is a problem that makes it unnecessarily large and expensive.

Second, it is not easy to cut in a straight line with conventional scissors. The cut surface tends to be curved, and the causes of this are complex. One is that the cutting speed with scissors is too slow, so the direction is changed while shearing. The other is that it is difficult to secure a reference point and the cutting direction is disturbed when cutting with an object. This problem can be significantly improved if the cutting speed is fast and the cutting object can be cut while supported on the desk and cut with an assistant.

Third, there is a safety issue for young children. Many safety devices have been devised for children's careless use of the scissors blade, but fundamentally, the risk does not disappear because the hand can come into contact with the blade. There are parts that can be improved so that the blade cannot be entered except for the target to be cut.

The present invention has the effect that all of the above three inconveniences are improved by one principle.

The first task is to improve the cutting force. Traditional scissors cut by concentrating pressure on two long scissors. One is to sharpen the scissors to make the material contact area as small as possible, and the other is to press. it's power However, in some cases, there are materials that are difficult to cut with these two forces. For example, if the material has excellent flexibility and elasticity, such as fiber or film, the material will bend before being cut and get caught between the scissors. Therefore, it is necessary to incorporate methods of cutting without bending even for flexible materials.

The second task relates to the convenience of cutting. The reason why traditional scissors are relatively inconvenient to cut in a straight line is that the cutting motion is slow, so the alignment of materials is disturbed while cutting, and it is difficult to grasp the baseline because the material is held in the hand, so it is difficult to grasp the direction of progress visually. It should be easy to do and the cutting speed should be fast so that the direction can be maintained consistently through the elasticity of the speed.

The third task is about safety, and there is a limit to reducing the risk of abnormal exposure of the scissors blade. It shall be possible to devise a cut that does not require the blade to be exposed.

First, the means used to improve the cutting force is to move the Gawit blade at a speed slightly faster than the speed at which the material enters the Gawit blade. did. The front wheel rolls on the cutting material to obtain rotational force, and this force is transmitted to the rear swivel wheel by a gear or belt. At this time, set the rotation rate a little faster so that the rear wheel rotates faster than the speed at which the front wheel rolls over the material. It is designed to cut by receiving the cutting force rather than the downward pressure of the blade.

Since it is difficult to maintain uniform contact between the blades consistently with the general circular blade of the rear wheel, and the general blade is easily damaged by friction between the blades, a new design is needed to make the contact between the blades uniform. This is a circular carbon steel The cutting angle was made asymmetrically, and the other side of the edge was polished to make it sharp.

Second, increasing the straightness of cutting can be realized by reducing the time for material to be disturbed when the cutting speed is increased. This reduces the time for materials to be messed up and leaves the material on the desk as it is, leaving only the lower part of the scissors in contact with the desk, so it is possible to make precise cuts like cutting with a knife and to use an assistant.

Third, unlike traditional scissors, this method does not cut with a long blade, but has a very narrow cut, so you can place the scissors inside the gap where your fingertips do not go.

The first is that even materials that are difficult to cut with conventional scissors are cut better due to the action of cutting without bending or pinching the material. The industrial application is very high.

The second is that there is no hand movement of scissors, just roll the scissors on the material to cut the material, so even if you work for a long time, your hands will not get tired. This is very useful when the operator works for a long time.

Third, the rotary blade is operated by a guide roller, so it can be rolled relatively accurately in the cutting direction using the straightness of the guide roller, making cutting easier and more precise than traditional scissors. very useful

Fourth, by the different cutting method of this invention, a long scissors blade is unnecessary, so it is easy to install it in the product body without exposing the scissors and it is easy to design so that the cutting material does not enter the fingers. Scissors can be

1 is a plan view of the invention;
2 is an elevation view of the invention
3 is a plan view, perspective view, elevation view and cross-sectional view of the rotating scissors
4 is a perspective view showing only the parts that determine the speed of the rotating scissors
5 is a plan view for user's visual reference when cutting
6 is a perspective view of the completed housing that can reduce the contact space around the scissors blade

In Figures 1 and 2, the locations of major parts were introduced. The first (5) is a guide roller with good contact friction, and while rolling on the material to be cut, the force obtained from the rotation is transmitted to the timing belt pulley (or gear) of (6), which is the timing belt (or gear) of (10). gear shaft) to the timing belt pulley (or gear) in (7), and finally to the rotating scissors in (1). At this time, if the rotation of the rotating scissors in (1) is slower than or equal to the rotation of the guide roller in (5), the entry speed is faster than the speed at which the cutting material is cut and damage occurs. A catalog design is required.

Figure 4 is a method devised so that the scissors blade rotates a little faster and cuts the material before pressing it like scissors. ), the number of teeth of the timing belt pulley (or gear) of (7) can be set higher than the number of teeth of the timing belt pulley (or gear) of (6) in order to increase the rotation ratio of the pulley of (7). The combination is used to obtain the desired rotation ratio.

Figure 3 is the shape of the blade designed to further improve the cutting force. (3) The contact area with the lower fixed scissors was reduced by making the left and right sides of the blade asymmetrical to make a cutting angle on one side, and on the other side, only the portion of the blade used for cutting protrudes and the rest of the blade enters concave. This has the purpose of reducing the frictional force because (1) the rotational movement of the rotating scissors is disturbed by increasing the frictional force as the sharpening blades engage each other precisely. It has a great purpose. This is the same reason that actual scissors manufacturers intentionally bend the blades slightly inward.

Figure 5 is a view of aligning (5) guide roller, (1) upper rotating scissors and (3) lower fixed scissors on a straight line to be cut. Among the reasons why the present invention has good straightness for cutting, the first is that it can cut quickly by rolling on the product with a guide roller without moving the scissors blade (5), reducing the time for material to be disturbed, and the second is (4) fixed scissors blade. This is because only the lower part of the support goes under the material, so you can cut the material on the desk, reducing the possibility of misaligning the material.

6 shows (12) housing to improve safety by (1) reducing the space around the upper rotating scissors so that fingers or the human body do not easily enter.

1: Upper rotating scissors
3: Under fixed scissors
4: Under fixed scissors support
5: guide roller
6: Timing belt pulley
7: Timing belt pulley
8: parts fixing frame
10: timing belt
12: human body protection housing

Claims (3)

In a scissors-like cutting method that cuts material while crossing two sharp edges, one of the blades is rotated and the power required for the rotation is obtained from the rotation of the roller accompanying the movement of the machine.
According to claim 1, In order to make the outer diameter rotation distance of the rotating scissors blade longer than the rotation distance of the roller outer diameter for the same time, the outer diameter size and the size of the power transmission shaft are compared to each other and connected to the device
The rotary type according to claim 1, wherein the rotating cutting edge is asymmetrically shaped as shown in Fig. 3, and the angle of the blade is formed on one side and only the edge is protruded and polished on the other side to minimize the contact area with the lower blade. asymmetrical scissors

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