JPH06126688A - Paper-like work cutting device - Google Patents

Abstract

PURPOSE:To provide a paper-like work cutting device that enables the high- speed cutting of a paper-like work by means of the promotions of lightness in weight and low inertia moment. CONSTITUTION:In a paper-like work cutting device provided with two cutters (b) on the circumference of a cylindrical core body (a), it is featured that this cylindrical core body (a) is composed of carbon fiber composite material, while there are provided these two cutters (b) on the circumference of the cylindrical core body (a) so as to make them become 'equidivision' with an axial center of the core body (a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a cutting device for paper-like materials such as cardboard, film and foil.

[0002]

2. Description of the Related Art Conventionally, a paper-like cutting device is one in which a blade is attached to the peripheral surface of a steel cylindrical core, and a drive motor attached to the end of the cylindrical core is driven at high speed. A system in which a cylindrical core and a cutter are driven while starting and stopping to cut a paper-like material into a predetermined size has been used.

[0003]

However, in the conventional cutting device, the cylindrical core for mounting the blade is made of steel, and the resistance received from the blade is large. Since it is necessary to suppress the bending, the rigidity must be increased and the moment of inertia must be very large.

In order to rotate such a motor having a large moment of inertia at a high speed and instantaneously repeat starting and stopping, the drive motor must have a very large horsepower. The moment of inertia of the motor also becomes large, and the addition of both the moment of inertia of the cylindrical core and the moment of inertia of the motor had to be considered.

For this reason, some paper cutting device manufacturers use a specially designed motor with a small rotor diameter and an extremely long motor, which is not available on the market, to reduce the moment of inertia. We are making efforts such as planning.

[0006] However, even if such a measure is taken, the cylindrical core body for attaching the cutting tool is not improved, so that the cutting speed cannot be greatly increased. Moreover, because the cost of the motor and control device is significantly increased, the cutting device will be very expensive, and the electricity cost during use will also be very high, so both manufacturers and users will be required to drastically improve the paper cutting device. This is a situation that we strongly desire.

The present invention solves the above-mentioned conventional problems,
An object of the present invention is to provide a paper-like material cutting device capable of cutting a paper-like material at high speed by reducing the weight and the moment of inertia.

[0008]

The present invention has the following constitution in order to achieve the above object. That is, the present invention is, in a paper-like material cutting device in which a blade is provided on the outer periphery of a cylindrical core body, the cylindrical core body is made of a carbon fiber composite material, and is equally divided with respect to the axis of the cylindrical core body. Thus, the paper-like material cutting device is characterized in that a plurality of blades are provided on the outer periphery of the cylindrical core.

Explaining the present invention in more detail, the first feature of the present invention is that the cylindrical core is made of a carbon fiber composite material. That is, in reducing the inertia of a paper-like material cutting device that requires high rigidity and low moment of inertia, the specific elastic modulus of the material serves as an index. The larger the specific elastic modulus, the lighter the weight and the lower the inertia. However, in contrast to the conventionally used steel having a specific elastic modulus of 2.7 × 10 ⁹ mm, in the case of a carbon fiber composite material, it varies depending on the type of fiber used and the fiber orientation angle. However, it is usually (5 to 15) × 10 ⁹ mm, which is an extremely high value of 2 to 6 times that of steel, and can be said to be a convenient material for achieving a low moment of inertia.

As described above, by using the carbon fiber composite material, it is possible to reduce the moment of inertia, but it is not possible to make a practical paper-like material cutting device by this alone. That is, it is known that the carbon fiber composite material exhibits remarkable anisotropy in elastic modulus and linear expansion coefficient depending on the orientation angle of the carbon fiber, but the fiber orientation angle that effectively develops the elastic modulus of the material is almost the same. At the same time, it is a fiber orientation angle that significantly reduces the linear expansion coefficient of the material. Therefore, in the case of a paper-like material cutting device that must be used in combination with a metal material having a large linear expansion coefficient, such as a blade, the mounting method and position of the blade on the carbon fiber composite material core are inappropriate. Then, due to the difference in the linear expansion coefficient of the carbon fiber composite material core body and the blade due to the temperature rise during use, the blade is deformed by a so-called bimetal phenomenon and becomes unusable.

By the way, when the cutter is used, the temperature rises by about 50 ° C. due to frictional heat generated when cutting from the blade and heat conduction from the drive motor. In order to solve such a problem, in the present invention, as shown in FIG. 1 and FIG. 3, a cylindrical core body (a) is cylindrically divided into equal parts with respect to an axial center (e). A plurality of blades (b) (two in FIG. 1 and three in FIG. 3) are attached to the outer circumference of the core (a), which is the second feature of the present invention.

The blade need not be linearly provided on the cylindrical core, and may be spirally provided at a certain angle.

Further, when attaching the cutting tool, it is desirable to attach it via a pedestal (c) as shown in FIGS. 1 and 3, rather than directly attaching to the outer periphery of the cylindrical core body. In this case, the pedestal ( As the material of (c), it is desirable to use a material having a low linear expansion coefficient such as a carbon fiber composite material or Invar so as not to cause unbalanced deformation due to heat.

The blade (b), the pedestal (c) and the cylindrical core (a) made of the carbon fiber composite material are joined by bolts, but the carbon fiber composite material is directly screwed. In this case, the carbon fiber composite material has a low shear strength, and further, there is a problem such as a screw disengagement due to violent vibration during operation of the device. To solve this problem, a block (d) for screw attachment may be installed inside the cylindrical core (a), and a bolt may be fastened to this block (d) from the outside of the blade (b).

Next, the method for producing the carbon fiber composite cylindrical core of the present invention will be explained. First, the carbon fiber used may be either an acrylonitrile carbon fiber or a pitch carbon fiber, and the type thereof is also limited. It is not something that will be done.

As the matrix resin, any of thermosetting resins such as epoxy resin and vinyl ester resin and thermoplastic resins such as PPS and PEEK can be used.

Further, as the method for manufacturing the cylindrical core body, any method such as a filament winding method or a sheet lapping method may be used.

[0018]

The present invention will be described in more detail with reference to the following examples.

(Embodiment) In this embodiment, the length of the cylindrical core and the blade is 2775 mm, the outer diameter is 210 mm, and the inner diameter is 130.
As shown in FIG. 1, a corrugated cardboard cutting device was manufactured in which the blades were provided in two upper and lower parts with a size of mm via a pedestal made of Invar. As the carbon fiber, a high elastic carbon fiber having an elastic modulus E of 46000 Kg / mm ² was used, and an epoxy resin was used as the resin, which was manufactured by a filament winding method.

The axial elastic modulus E of the obtained core is 2130.
0 kg / mm ² , axial rigidity EI is 1.73 × 10 ^12.
Kg · mm ² , which was the same as that of conventional steel of the same size. Comparing the inertia moment of this with that of the conventional steel, the product of the present invention is 0.072 Kg · M · sec ² , whereas the conventional product is 0.362 Kg, which is about five times that.
・ It was M · sec ² . In addition, this cutting device
Repeatedly starting and stopping at rpm, the followability was very good and thermal deformation of the blade was hardly observed.

[0021]

According to the present invention constructed as described above,
Since the cylindrical core is made of carbon fiber composite material, it is much lighter in weight and has a lower moment of inertia than the conventional steel one, which makes it possible to start and stop the machine frequently. The excellent effects that the motor can be miniaturized, the cutting device can be speeded up, and the amount of electricity used can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an example of a paper-like material cutting device according to the present invention.

FIG. 2 is a vertical sectional front view of the apparatus shown in FIG.

FIG. 3 is a vertical sectional side view showing another example of the paper-like material cutting device according to the present invention.

[Explanation of symbols]

(A) Carbon fiber composite material cylindrical core (b) Cutter (c) Cutter mounting base (d) Bolt fastening block (e) Central shaft coupled to motor (f) Central shaft and cylindrical core Header part that joins with

Claims (1)

[Claims] 1. A paper-like material cutting device in which a blade is provided on the outer periphery of a cylindrical core body, wherein the cylindrical core body is made of a carbon fiber composite material, and the cylindrical core body is divided into equal parts. As described above, a cutting device for paper-like material, wherein a plurality of blades are provided on the outer circumference of the cylindrical core.