JPH09156808A - Pressure-contact roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To narrow the diameter of a shaft by forming a roller shell and the shaft of the carbon fiber reinforced resin and/or the carbon fiber reinforced metal. SOLUTION: When a load is applied to both ends of a shaft 2 of a pressure- contact roller 1 by a presser means, the load presses a cylindrical rotor of the roller shell 3 through spherical bearings 4a, 4b. At this stage, a winding roller 7, which contacts with the cylindrical rotor through a sheet layer, is bent in the pressing direction, but the spherical bearings 4a, 4b are rotated within the longitudinal cross section of the shaft 2 so as to allow the bending of the cylindrical rotor. With the bending of the winding roller 7, the cylindrical rotor is evenly curved, and both the rollers are evenly nipped over the whole area in the axial direction through the sheet layer. The shaft 2 and the roller shell 3 are made of the carbon fiber reinforced resin or the carbon fiber reinforced metal. In this pressure-contact roller 1, rigidity of the shaft 2 is improved so that the diameter thereof can be narrowed by using the carbon fiber reinforced material for the shaft 2 and the roller shell 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure roller for contacting a take-up roller for winding a running sheet or a guide roller for guiding a sheet through the sheet.

[0002]

2. Description of the Related Art Generally, in order to wind a sheet material such as a film into a roll shape, a pressure contact roller is brought into close contact with the sheet material on the winding roller over the entire width direction and a uniform nip force is applied. It is well known that pressure welding is effective. Further, the pressing roller is usually required to have the following three technical problems.

First, the pressure contact roller is in close contact with the take-up roller over the entire range in the width direction, and is in pressure contact with a uniform nip force. That is, if a uniform nip is not formed at any position in the width direction of the pressure roller, unevenness occurs in the amount of air caught between the layers of the sheet-like material, which leads to various winding defects.

Secondly, the outer diameter of the pressure roller should be made as small as possible. This is because the amount of air taken in between the layers of the sheet-like material taken up increases in proportion to the outer diameter of the pressure roller. However, the smaller the diameter, the lower the rigidity of the pressure contact roller itself.If the journal part of the shaft is pressed in the direction of the take-up roller as in the conventional case, the vicinity of the center of the pressure contact roller will bend in the direction opposite to the pressing direction, and the center will become even more central. A new contradiction arises in that the surface pressure near the part decreases.

Thirdly, the pressure roller can absorb the vibration from the take-up roller as much as possible. This is because if the vibration cannot be absorbed, air is taken in through a gap generated between the sheet-like material being wound and the pressure contact roller intermittently, leading to a winding defect.

That is, the above-mentioned three points of uniform nip, diameter reduction, and vibration absorption are the technical problems required for the pressure contact roller.

As a conventional pressing roller for the purpose of improving such technical problems, for example, Japanese Patent Publication No. 6-4541.
The proposal of the pressure contact roller of Japanese Patent No. 0 is known.

FIG. 4 is a schematic longitudinal sectional view showing an example of a sheet-like material winding device using the conventional pressure contact roller shown in this patent.

As shown in FIG. 4, the pressure contact roller 1 has a shaft 2 inserted through a roller shell 3 concentrically, with a constant space C in the longitudinal direction between the shaft 2 and the roller shell 3. By fitting the spherical bearings 4a and 4b at two places, the bending of the central portion of the shaft 2 is separated from the bending of the roller shell 3,
By making the entire roller shell 3 follow the bending of the winding roll 7, a uniform nip is made possible.

[0010]

However, when the above pressure contact roller is made of carbon steel, which is a general material, the spherical bearings 4a and 4b occupy a relatively large proportion in the radial direction, so that the outside of the roller shell 3 is not covered. When the diameter D is constant, the shaft diameter d of the shaft 2 must be made thin, which lowers the critical speed and makes it impossible to cope with high-speed production equipment. On the contrary, if the shaft strength is secured, it is impossible to further reduce the diameter.

An object of the present invention is to provide a pressure contact roller which eliminates a non-uniform nip caused by the amount of deflection of the pressure contact roller or the guide roller, satisfies the vibration absorption and the diameter reduction, and is excellent in high speed performance. Especially.

[0012]

According to the pressure contact roller of the present invention for achieving the above object, a shaft is concentrically inserted into a roller shell, and a constant gap is provided in the longitudinal direction between the shaft and the roller shell. In a pressure-contacting roller having a spherical bearing mounted with a space between the roller shell and the shaft, carbon fiber reinforced resin and / or
Alternatively, it is characterized by being composed of a carbon fiber reinforced metal.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail based on an embodiment shown in the drawings.

FIG. 1 is a schematic vertical sectional view showing an example of a sheet-like material winding device using the pressure roller of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

Further, FIG. 3 is a schematic vertical sectional view of a pressure contact roller used in the winding device of FIG.

The pressure contact roller 1 of the present invention has a shaft 2 having journal portions at both ends and a constant distance C near the center of the shaft 2.
Spherical bearings 4a and 4b that are fixed apart from each other, a roller shell 3 whose outer layer is covered with a covering material 5 made of an elastic body such as rubber, and a pair of fluids that are pressing means provided in the journal portion of the shaft 2. It consists of cylinders 6a and 6b. The lower portion 7 of the press roller 1 is a winding roller whose journal portion is supported by a pair of bearings and is bent in a concave shape. F is wound by the winding roller 7 by a winding means (not shown). It is a synthetic resin film.

The spherical bearings 4a, 4b rotatably support the cylindrical rotating body of the roller shell 3 coated with the coating material 5 with respect to the shaft 2, and are a pair of fluid cylinders serving as pressing means. Even when the pressing force of 6a and 6b acts on the cylindrical rotating body to bend, the bearing does not hinder the free bending. Therefore, when a load is applied to both ends of the shaft 2 of the pressure roller 1 by the pressing means, the load presses the tubular rotating body via the spherical bearings 4a and 4b mounted at two positions on the shaft 2. As a result, the winding roller 7, which is in contact with the tubular rotating body via the sheet layer, also receives the load from the tubular rotating body and bends in the pressing direction. At this time, the spherical bearings 4a and 4b of the pressure contact roller are Since the cylindrical rotating body is allowed to bend in the pressing direction by rotating within the longitudinal cross section of the shaft 2, the cylindrical rotating body follows the winding roller 7 and is uniformly curved,
The bending curves of the cylindrical rotating body and the take-up roller 7 coincide with each other, and both rollers are uniformly nipped across the entire area in the width direction via the synthetic resin film sheet layer.

In the pressure contact roller 1 of the present invention constructed as described above, the material of the shaft 2 and the roller shell 3 is
Although general structural materials such as carbon steel and rolled steel for machine structure can be used, it is necessary to use carbon fiber reinforced resin or carbon fiber reinforced metal to solve the above problems. It becomes a condition.

Particularly, it is preferable that the roller shell 3 is made of carbon fiber reinforced epoxy resin and the shaft 2 is made of carbon fiber reinforced aluminum.

The shaft diameter d of the shaft 2 is not particularly limited, but in the present invention, since the shaft 2 itself has a function of absorbing the vibration from the winding roller, it is preferable that the shaft diameter d is as thin as possible to avoid a dangerous speed. Further, the pressure contact roller 1 of the present invention is designed so that the frequency of use is lower than the natural frequency. Therefore, the influence of the shaft 2 which is longer than the roller shell 3 is dominant on the natural frequency of the pressure roller 1, so that the shaft 2 of the present invention can be used in the range of use of the pressure roller 1. It is preferable to design such that the frequency is lower than the natural frequency of the pressure roller. By doing so, the pressure contact roller 1 of the present invention has the shaft 2 in the elastic deformation region thereof.
Even if vibration occurs due to eccentricity, deformation, imbalance, etc. of the take-up roller 7 or the roller shell 3 itself due to the bending of itself, the vibration can be easily absorbed.

Therefore, the diameter of the carbon fiber reinforced aluminum shaft 2 can be reduced if the natural frequency is constant.

The outer layer of the roller shell 3 is preferably covered with an elastic body 5 such as rubber. However, in the present invention, the shaft itself absorbs the vibration from the take-up roller as described above. is not. It is preferable that the outer diameter D be as small as possible within the range of the natural frequency of the entire pressure contact roller in order to reduce the diameter.

In the present invention, when carbon fiber reinforced resin or carbon fiber reinforced metal is used for the shaft 2 and the roller shell 3, the natural frequency of the pressure contact roller is increased to improve the high speed rotation performance for the following reason. is there.

The rigidity of a rotating body such as a roller, in other words, the natural frequency is a value obtained by dividing the value of the tensile modulus of elasticity of the material by the specific gravity of the material when compared with the same size and shape, that is, As for the elastic modulus (= tensile elastic modulus / specific gravity), the higher the value, the higher the high-speed rotation performance becomes. However, as shown in Table 1, compared with steel and aluminum, the fiber reinforced material is
The value of the tensile elastic modulus of the material is several times higher, and the pressure roller composed of this material has a high natural frequency and can be adapted to high speed. In addition, since the specific gravity is small, the pressure contact roller is light in weight and easy to handle.

[0026]

[Table 1] When the entire pressure contact roller having the structure of the present invention is modeled as a beam, the mass of the roller shell 3 is supported by the beam (shaft 2) whose both ends are supported by the pressing means 6a, 6b via the spherical bearings 4a, 4b. It can be said that it has been done. Therefore, of the beams supporting the mass body, of the materials having a high inelastic modulus, the material having a particularly high tensile elastic modulus has a smaller flexure with respect to an external force such as a load, and a high natural frequency can be obtained.
That is, carbon fiber reinforced aluminum is preferable as the material used for the shaft 2.

On the contrary, in the roller shell 3 which is a mass body, a material having a high specific modulus has a smaller load on the beam (shaft 2) among materials having a high inelasticity, and the natural vibration of the system as the whole pressure contact roller is reduced. Higher numbers. That is, as the material used for the roller shell 3, carbon fiber reinforced epoxy resin is more preferable.

Further, since the pressure contact roller is made of a fiber reinforced material having a small specific gravity to reduce its weight, the followability with respect to the vibration from the take-up roller 7 and the followability with rotation are significantly improved.

According to the present invention, in the pressing roller, by using the carbon fiber reinforced material for the shaft and the roller shell, the rigidity of the shaft acts to reduce the diameter while maintaining the vibration absorbing property and the uniform nip property, and the roller having a small specific gravity is used. The shell reduces the load on the shaft, raises the overall natural frequency, and acts on high speed performance. Furthermore, the weight reduction affects the handling property.

The present invention described above has been described by taking as an example a winding device for a synthetic resin film as a sheet, but the present invention is not limited to this and, for example, a sheet of cloth, paper, thin plate metal or the like. It can also be applied to a nip roller in a process of conveying a shaped object, a pressure contact roller in a winding section, or the like.

[0031]

EXAMPLES Example 1, Comparative Examples 1 and 2 In the apparatus shown in FIGS. 1 and 2, the case where the carbon fiber reinforced material was used for the shaft 2 and the roller shell 3 of the present invention was referred to as Example 1 and was not used. Table 2 shows the execution conditions and the results, assuming the cases as Comparative Examples 1 and 2.

Here, regarding the quality of the uniform nip property,
It appears as unevenness of winding hardness in the width direction of the synthetic resin film F on the take-up roller, and it shows as winding hardness when the diameter of the press roller is small, and as winding hardness and winding quality when it comes to vibration absorption. As they appear, these items were used as the judgment targets for each result.

The synthetic resin film F has a thickness of 10 μm.
Using a polyester film of m, the winding hardness unevenness and winding hardness in the width direction are determined by a spring type hardness tester (JIS K6301 A
Grade) was used for the measurement.

As is clear from Table 2, Example 1 using the carbon fiber reinforced material has a uniform nip property, a smaller diameter, vibration absorption, and handling as compared with Comparative Examples 1 and 2 not using the carbon fiber reinforced material. It turns out that both are excellent.

[0035]

[Table 2]

[0036]

Since the present invention has the above-described configuration,
The following excellent effects are obtained.

A carbon fiber reinforced material was used for the shaft 2 and the roller shell 3 in the pressure contact roller in which spherical bearings were mounted between the roller shell and the shaft at two positions spaced by a constant distance in the longitudinal direction of the shaft. Therefore, although the shaft has a smaller diameter, the natural frequency can be secured and the vibration absorption can be improved. Further, the roller shell having a small specific gravity can reduce the load on the shaft and increase the natural frequency of the whole. Therefore, the outer diameter of the pressing roller can be reduced, the high-speed performance can be further improved, and the handleability can be improved by reducing the weight.

Therefore, the amount of air trapped between the sheet layers is drastically reduced, and wrinkles of the sheet-like material due to the inclusion of air,
It is possible to eliminate winding defects such as lost edges and uneven winding hardness. Further, even if the take-up roller or the guide roller vibrates, the roller shell rotates while maintaining a uniform nip to the sheet-like material, so that the above-mentioned air is prevented from being mixed and the take-up speed and the conveying speed are also prevented. Can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic vertical cross-sectional view showing an example of a sheet-like material winding device using a pressing roller of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a schematic vertical sectional view of a pressure contact roller used in the winding device of FIG.

FIG. 4 is a schematic vertical sectional view showing an example of a conventional sheet-like material winding device using a pressure roller.

[Explanation of symbols]

 1: Pressing roller 2: Shaft 3: Roller shell 4a, 4b: Spherical bearing 5: Surface layer coating material 6: Pressing means 7: Winding roller C: Spherical bearing spacing D: Pressing roller outer diameter d: Shaft outer diameter L: Roller Shell length F: Synthetic resin film (sheet)

Claims (2)

[Claims] 1. A pressure contact roller in which a shaft is concentrically inserted through a roller shell, and a spherical bearing is mounted between the shaft and the roller shell at a constant interval in the longitudinal direction. A pressure contact roller characterized in that is composed of a carbon fiber reinforced resin and / or a carbon fiber reinforced metal. 2. The pressure contact roller according to claim 1, wherein the roller shell is made of carbon fiber reinforced epoxy resin, and the shaft is made of carbon fiber reinforced aluminum.