JPH0518073Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a cutting machine for cutting sheet materials such as cloth, and is intended to further improve cutting power than conventional machines.

[Conventional technology]

A machine that cuts a sheet material such as cloth as a target by arranging a large number of small blades in a mesh pattern and selectively protruding the blades at the required locations by energizing an electromagnetic coil. A large number of units such as electromagnetic coils that drive the target are arranged above or below the target.

FIG. 3 shows an example of a basic unit, in which a is a front view and b is a side view of the blade portion. The upper part passes through the central through hole of the electromagnetic coil 1 and is made of magnetic material 2.
a, cutter drive shaft 2 whose lower part is made of non-magnetic material 2b;
A cutter 4 is attached to the tip of the lower non-magnetic material 2b, and a cutter drive shaft 2 is suspended from the upper part by a spring 3.

A sheet material 5 such as cloth whose target is the knife 4 at all times.
The blade edges are facing each other at a certain distance from the blade, and the magnetic material 2a of the blade drive shaft 2 is protruding above the electromagnetic coil 1, but when the electromagnetic coil 1 is energized, it is caused by electromagnetic force. The magnetic material 2a overcomes the force of the spring 3 and is attracted into the electromagnetic coil 1, and the cutting edge of the cutter 4 is press-fitted into the sheet material 5.
The sheet material 5 is cut by a length of . When the current to the electromagnetic coil 1 is cut off, the blade 4 returns to its original position by the force of the spring 3.

FIG. 4 is a diagram showing the arrangement of a large number of units, and is a plan view of the arrangement of a large number of units shown in FIG. Only the cutting edge of the knife 4 is shown by a broken line.

A large number of units are arranged in a plane, and each unit has one blade 4, which is attached to the tip of a blade drive shaft that passes through the electromagnetic coil 1.
This is an example in which adjacent blades 4 are in slight contact with each other to form a rectangular mesh structure.

FIG. 2 is a cross-sectional view of the main part of the electromagnetic coil section taken along the line - in FIG. 4, and the same reference numerals as in FIG. 3 indicate the same parts. Conventionally, as shown in FIG. 2, all the electromagnetic coils 1 have the same polarity in the vertical direction.

That is, in the example shown in FIG. 2, all the electromagnetic coils 1 have the upper side as the north pole and the lower side as the south pole.

[Problem that the invention attempts to solve]

In the conventional structure shown in Fig. 2,
The lines of magnetic force generated when the electromagnetic coil 1 is energized pass through a non-magnetic material space for a long time. That is, since the magnetic resistance is large, a large magnetomotive force (ampere turns) is required to obtain the necessary cutting force. Furthermore, if units along the line ~ in Figure 4 are selected consecutively and all of these electromagnetic coils 1 are energized, adjacent electromagnetic coils 1 will interfere with each other, causing a phenomenon in which the electromagnetic force decreases. do.

In order to further increase the electromagnetic force, it is necessary to pass more current through the wires that make up the electromagnetic coil 1 and to increase the number of turns of the wire in the electromagnetic coil 1, but this increases the size of the electromagnetic coil 1. This leads to things.

Increasing the height of the electromagnetic coil 1 increases the magnetic resistance accordingly, which is not effective.Increasing the diameter of the electromagnetic coil 1 also increases the length of the blade 4, which reduces the required cutting force. There were problems such as increasing the amount of water and reducing its effectiveness.

[Means for solving problems]

In a cutting machine with a unit arrangement as described above,
As a means for increasing the electromagnetic force when the blades 4 are selected continuously, the cutting machine according to the present invention is characterized in that the polarities of adjacent electromagnetic coils 1 are alternately reversed.

FIG. 1 is a diagram showing the polarity of the electromagnetic coil of the cutting machine according to the present invention, and is a cross-sectional view of the main part of the electromagnetic coil along the line ~ in FIG. 4, similar to FIG.
The same reference numerals as in the figures indicate the same parts.

In the cutting machine according to the present invention, the polarity of adjacent electromagnetic coils 1 is alternately reversed as shown in FIG. The upper side has the S pole and the lower side has the N pole, and the electromagnetic coils 1 of the units adjacent to each other on both sides have the upper side as the N pole and the lower side as the S pole.

The same applies when the number of units increases, and the polarities of all adjacent electromagnetic coils 1 are alternately reversed.

[Effect]

If the polarities of the electromagnetic coils 1 are the same as in the past, when the blades 4 are selected successively, the direction of the lines of magnetic force generated by energizing the electromagnetic coil 1 will be the direction of the lines of magnetic force generated from the adjacent electromagnetic coil 1. Since the return magnetic path must pass through the space between the electromagnetic coils 1, the magnetic resistance increases and the amount of magnetic flux decreases.

When the polarities of adjacent electromagnetic coils 1 are alternately reversed as in the present invention, when blades 4 are successively selected, the lines of magnetic force generated when a certain electromagnetic coil 1 is energized are Since the lines of magnetic force generated by the energized electromagnetic coil 1 can be used as a return magnetic path, magnetic resistance is reduced and the amount of magnetic flux is increased.

〔Example〕

A knife drive shaft 2 was composed of a magnetic material 2a with a diameter of 1.6 mm and a non-magnetic material 2b, and a knife 4 with a blade length of 5 mm was attached to the tip. On the other hand, a unit was constructed by passing the cutter drive shaft 2 through the center of an electromagnetic coil 1 having 2300 turns, a resistance value of 40Ω, and an outer diameter of 3.5 mm. This unit is connected to the blade drive shaft 2.
Two sets of five wires were prepared in which the center spacing was 3.54 mm.

One of these two sets has the same polarity of the electromagnetic coil 1 as in the conventional arrangement shown in FIG. 2, and the adjacent electromagnetic coil 1 as in the other arrangement according to the present invention shown in FIG. The polarity between them was alternately reversed.

For each of these two sets, one set of five electromagnetic coils 1 was energized, and the applied voltage and the generated electromagnetic force were measured. Measurements of the generated electromagnetic force were carried out on the central unit in both sets. Figure 5 shows the measurement results of the relationship between voltage and electromagnetic force.

As is clear from FIG. 5, it was confirmed that in the case of adjacent polarity reversal as in the present invention, the electromagnetic force can be approximately doubled at the same voltage compared to the case of the same polarity in the conventional method.

[Effect of idea]

In the cutting machine according to the present invention, by alternately reversing the polarity of adjacent electromagnetic coils 1, it was possible to generate about twice as much electromagnetic force as in the conventional case of the same polarity.

In other words, if the electromagnetic force remains the same, the applied voltage can be reduced to about half, and the heat generation due to the loss generated by the electromagnetic coil 1 is reduced to about 1/4, which reduces the lifespan of the electromagnetic coil 1. You can get very good results.

In the above explanation, the case where the units are arranged so that the cutter 4 has a regular square mesh structure has been described, but the same effect can be obtained when the units are arranged so that the cutter 4 has a regular hexagonal mesh structure. is clear.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the polarity of the electromagnetic coil of the cutting machine according to the present invention, and Fig. 2 is a diagram showing the polarity of the electromagnetic coil of the conventional cutting machine. Fig. 3 is a diagram of an example of a basic unit, and a is a front view;
4b is a side view of the cutter portion, and FIG. 4 is a plan view showing the arrangement of a large number of units. FIG. 5 is a graph showing the relationship between voltage and electromagnetic force. 1... Electromagnetic coil, 2... Blade drive shaft, 2a...
...Magnetic material, 2b...Nonmagnetic material, 3...Spring,
4...Knife, 5...Sheet material.

Claims (1)

[Scope of utility model registration request] A cutting machine in which a large number of small blades driven by electromagnetic coils are arranged in a plane, and a selected one of these blades is press-fitted into a sheet of cloth or the like to cut it into a predetermined shape. A cutting machine characterized in that a large number of electromagnetic coils for driving blades are arranged in a shape, and the polarity of adjacent ones is alternately reversed.