JPS6331919Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention is based on the mesh structure of the cutter.
This relates to improvements in cutting machines for sheets, etc., and is intended to further improve cutting power compared to conventional machines.

[Conventional technology]

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

For example, FIG. 3 is a diagram of an example of a conventional structural unit, in which a shows a front view and b shows a side view of the cutter part. A cutter drive shaft 2 is provided through the central through-hole of the electromagnetic coil 1, and the upper part is made of a magnetic material 2a and the lower part is made of a non-magnetic material 2b. 4 is attached and is suspended from the top by a spring 3. The cutting edge of the cutting tool 4 is normally in a state where the cutting edge faces the target object, a thin material 5 such as cloth or sheet, at a certain distance, but when the electromagnetic coil 1 is energized, the spring 3 is moved by the electromagnetic force. Overcoming the force, the magnetic material 2a is attracted into the electromagnetic coil 1, and the blade 4 is press-fitted into the thin sheet material 5, and the thin sheet material 5 is cut by the length of the blade 4. 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.

The magnetic material 2a constituting a part of the blade drive shaft 2 can be made of either a soft magnetic material such as soft iron or a permanent magnet.

Figure 4 is a diagram showing the arrangement of a large number of units.
A cross section taken along line A is shown, and only the cutting edge of the knife 4 is shown with a broken line for easy understanding. The linear blades 4 provided in each of a large number of units are examples in which adjacent blades lightly touch each other and have a rectangular mesh structure. By selecting a necessary unit according to the desired cutting shape and energizing the electromagnetic coil 1, the blade 4 of the energized unit cuts the thin material 5 into the desired shape.

[Problems with conventional technology]

In such a structure, the lines of magnetic force generated when the electromagnetic coil 1 is energized pass through a long path in the non-magnetic material space, which means that the magnetic resistance is large, so in order to obtain the required cutting force, a large amount of force is required. Requires magnetomotive force (ampere turns). Therefore, it is necessary to increase the number of turns of the electric wire in the electromagnetic coil 1 and to flow a relatively large current, but this leads to an increase in the dimensions of the electromagnetic coil 1.

If the height of the electromagnetic coil 1 is increased, the magnetic resistance will also increase accordingly, making it less effective.If the diameter of the electromagnetic coil 1 is increased, the length of the blade of the knife 4 will also be increased, making it difficult to cut the required cutting. Increases power and reduces effectiveness. Moreover, the mesh shape surrounded by the cutter 4 becomes large, and it is desirable to make the blade length of the cutter 4 as small as possible in order to cut into a complicated shape, so it is not preferable to increase the diameter of the electromagnetic coil 1.

As described above, the conventional devices shown in FIGS. 3 and 4 have limitations in increasing the cutting force and in reducing the mesh shape, respectively, and have the disadvantage that their applications are limited.

[Means for solving problems]

The present invention was made to solve the above problems, and is constructed so that the space of non-magnetic material is minimized in the path of the magnetic lines of force generated when the electromagnetic coil 1 is energized. This means that the shape should not be too large.

[Summary of the idea]

In the conventional unit arrangement shown in Fig. 4, four units are arranged so that the outer peripheries of the electromagnetic coils are in close contact with each other, and the four cutters form a square mesh. In this invention, six units are arranged so that the outer peripheries of the electromagnetic coils are in close contact with each other, so that the six blades form a hexagonal mesh.

In the center of the six units placed at each apex of the hexagon, there is a space in which to place another unit of the same shape, but magnetic material is placed in this area to create a return path for the lines of magnetic force generated by the electromagnetic coil. By making the magnetic coils have a smaller magnetic resistance, the cutting force of the electromagnetic coils having the same structure can be increased.

〔Example〕

FIG. 1 is a partial vertical sectional view passing through the center of the constituent units of an embodiment of the cutting machine according to the present invention, and FIG. 2 is a diagram showing the arrangement of the units, taken along the line BB in FIG. It is a cross-section taken along the same direction, and only the cutting edge of the knife is shown with a broken line for easy understanding, and the same reference numerals as in FIGS. 3 and 4 indicate the same parts.

Similar to the conventional product shown in FIG. 3, the component unit is provided with a cutter drive shaft 2 which passes through a central through hole of an electromagnetic coil 1 and is made of a magnetic material 2a at the top and a non-magnetic material 2b at the bottom. A linear cutter 4' is attached to the tip of the lower non-magnetic material 2b, and is suspended from the upper part by a spring 3. The cutting tool 4' is normally placed with its cutting edge facing away from the target thin material 5 such as cloth or sheet at some distance.

A large number of such constituent units are arranged in a plane as shown in FIG. That is, electromagnetic coil 1
Six units are arranged at each apex of the hexagon so that the outer peripheries of the hexagonal mesh are in close contact with each other, and the linear cutters 4' provided in each unit are in close contact with each other to form a hexagonal mesh structure. arranged to configure.

In the center of the six unit electromagnetic coils 1 placed at each apex of the hexagon, there is a space in which to place another unit of the same shape, but in this area there is a space slightly higher than the electromagnetic coil 1. An iron core 6 made of a magnetic material is disposed, and a yoke 7 made of a magnetic material is disposed and fixed in close contact with the upper and lower surfaces of the iron core 6.

The upper and lower yokes 7 have holes formed at positions aligned with the centers of the electromagnetic coils 1, and the blade drive shaft 2 passes through them with a small gap. With this configuration, the iron core 6 and the upper and lower yokes 7 form a return path for the magnetic lines of force that are generated when current is passed through the electromagnetic coils 1.

Therefore, by the iron core 6 and the upper and lower yokes 7,
The magnetic resistance is reduced, a large magnetic flux density is obtained with a relatively small magnetomotive force, and the cutting force is improved. Moreover, if the diameter D of the electromagnetic coil 1 of the unit is the same as that of the conventional one, the blade length L of the conventional one in which the outer peripheries of the electromagnetic coils 1 are brought into close contact with each other and arranged in a square shape.
is √2D or approximately 1.414D, but in the case of the present invention in which the outer peripheries of the electromagnetic coils 1 are arranged in a hexagonal shape with close contact with each other, the blade length L' is (2/√3)D or approximately 1.155D, and the blade length L′ is (2/√3)D or approximately 1.155D, Since the length becomes shorter,
Furthermore, the cutting force increases.

Furthermore, when the outer circumferences of the electromagnetic coils 1 are brought into close contact with each other and arranged in a rectangular shape as in the conventional case, the density of the unit is 0.785, but as in the present invention, the density of the unit is 0.785 when the outer circumferences of the electromagnetic coils 1 are brought into close contact with each other and arranged in a hexagonal shape. When the iron core is placed in the central space, the density of the unit is 0.698, which does not decrease significantly and does not affect cutting accuracy.

In the above embodiment, an iron core 6 made of a magnetic material is placed in the space created at the center of the six units arranged at each apex of the hexagon, but instead of this iron core 6, a fixed iron core is built in. By arranging an electromagnetic coil,
In order to cut into a desired shape, the electromagnetic coils 1 of the units are energized, and the electromagnetic coils adjacent to these units that incorporate the fixed iron core are also energized to generate a magnetomotive force in the opposite direction.
It can also help distribute magnetic lines of force to desired units.

Further, by using a permanent magnet instead of the electromagnet formed by the electromagnetic coil built into the fixed core, the cutting force can be increased by assisting the magnetomotive force of the unit.

[Effect of idea]

As explained in detail above, according to the cutting machine according to the present invention, the cutting force of the unit can be increased, so the diameter of the electromagnetic coil 1 can be reduced, and the length of the blade of the cutter can also be reduced. hand,
Allows cutting of complex shapes. In addition, in the conventional device shown in Fig. 4, in which the unit is arranged at the apex of a rectangle, the angle of the seam of the cutter 4 is 90°;
In the cutting machine according to the present invention shown in Fig. 2, the unit is arranged at the apex of the hexagon, and the angle of the joint of the blade 4' is 120°, and the sharpness is relaxed. This is desirable.

[Brief explanation of the drawing]

Fig. 1 is a partial longitudinal sectional view passing through the center of the constituent units of an embodiment of the cutting machine according to the present invention, and Fig. 2 is a diagram showing the arrangement of the units, taken along the line BB in Fig. 1. This is a cross-section taken along the line. Figure 3 is a diagram of an example of a conventional configuration unit, where a is a front view;
b is a side view of the cutter part, and FIG. 4 is a diagram showing the arrangement of a large number of units, and is a cross-section of the arrangement of a large number of units shown in FIG. 3 along line A-A. 1... Electromagnetic coil, 2... Blade drive shaft, 2a...
...Magnetic material, 2b...Nonmagnetic material, 3...Spring,
4... cutlery, 5... thin leaf material, 6... iron core, 7...
...Yoke.

Claims (1)

[Scope of utility model registration request] A unit that drives the blades in a cutting machine that arranges a large number of small blades in a mesh pattern, energizes an electromagnetic coil to selectively project the blades at the required locations, and press-fits them into the target object, such as cloth or sheet. are placed at each apex of the hexagon, and the straight cutters provided on each unit are formed to form a hexagonal mesh structure, and furthermore, lines of magnetic force are placed at the center of the six units placed at each apex of the hexagon. This cutting machine is characterized by an iron core that serves as a path for the magnetic field lines to form a return path for the lines of magnetic force together with the upper and lower yoke.