JPH0826535A - Winding device for sheet-shaped object - Google Patents

Abstract

PURPOSE:To provide a sheet-shaped object winding device equipped with a pressure contact roller while satisfying a uniform nip, forming in a small diameter and vibration absorptivity, further to be excellent in high speed performance and further to enable also manufacturing cost reduction. CONSTITUTION:In a winding device for a sheet-shaped object formed in a manner wherein a pressure contact roller 1, inserting a shaft 2 concentrically to a roller shell 3 connected by only a width direction center part of the roller shell 3, is brought into pressure contact with a swinding roller 10 or guide roller of the sheet-shaped object F by pressing means 6a, 6b arranged in both ends of the shaft 2, the sheet-shaped swinding device interposes an elastic supporting member 4, consisting of elastic material, in a connecting part between the roller shell 3 and the shaft 2 in the width direction center part so as to charge a clearance between the roller shell 3 and the shaft 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device in which a winding roller or a guide roller for a sheet material such as a synthetic resin film is provided with a pressure roller for pressing the sheet material through the sheet roller.

[0002]

2. Description of the Related Art Generally, a device for winding a sheet material such as a film adjusts the hardness of a winding layer by pressing a pressure roller against a winding roller for winding the sheet material via the sheet material. I am trying to improve my appearance. The pressing roller for performing the above-mentioned action is usually required to have the following three technical problems.

First, the pressure contact roller is in close contact with the sheet-like material on 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 there is a position where the nip is not evenly formed in either of the width directions of the pressure roller, unevenness occurs in the amount of air caught between the layers of the sheet-like material, causing various winding defects.
The second is to reduce the outer diameter of the pressure contact roller as much as possible. This is because if the outer diameter becomes too large, the amount of air caught between the layers of the wound sheet-like material will increase.
However, since the rigidity of the pressure contact roller itself is reduced due to the reduction in diameter, when the journal portions at both ends of the roller shaft are pressed toward the take-up roller side, the vicinity of the center portion in the width direction of the pressure contact roller bends in the direction opposite to the pressing direction, There arises a problem that the surface pressure near the central portion decreases.

Third, the pressure contact roller has a function of absorbing the vibration of the take-up roller as much as possible. This is because if the vibration cannot be absorbed, air will be taken in through a gap generated between the sheet-like material being wound up and the pressure contact roller intermittently to cause a winding-up defect. Conventionally, in order to satisfy the above-mentioned three required characteristics of uniform nip, diameter reduction, and vibration absorption, for example, Japanese Utility Model Publication No. 2-29076 and Japanese Patent Laid-Open No. 2-6604.
There is a proposal of a pressure contact roller such as Japanese Patent No. 2 publication. In the former pressure contact roller 1 disclosed in Japanese Utility Model Publication No. 2-29076, as shown in FIG. 6, a roller shell 3 is connected and fixed only at a central portion S of a shaft 2 having a thick central portion in the width direction. It is intended to evenly nip the winding layer on the winding roll 10 when the winding roll 10 is pressed.

However, the pressing roller 1 bends along the bending curve of the take-up roller 10 on both sides of the central connecting portion S to obtain a uniform nip, but in the area of the connecting portion S itself, the pressing direction is different. Has a problem that it bends in a convex shape in the opposite direction and a gap is formed between both rollers, so that a completely uniform nip pressure cannot be obtained in the entire width direction. Furthermore, satisfactory performance was not obtained in terms of vibration absorption.

On the other hand, in the pressure contact roller 1 proposed by Japanese Patent Laid-Open No. 2-66042, as shown in FIG. 7, the spherical bearings 7a and 7b are fitted to the central connecting portions to bend the central portion of the shaft. Is separated from the bending of the roller shell 3, and the entire roller shell 3 can be made to follow the bending of the take-up roll 10, thereby overcoming the problem of uniform nip.

However, since the spherical bearings 7a and 7b occupy a relatively large space in the radial direction, when the outer diameter of the roller shell 3 is fixed, the shaft 2 must be thinned, and therefore the critical speed is limited. However, there was a problem in that it could not support high-speed production equipment. Also,
For the maintenance of the pressure contact roll, it is necessary to disassemble the shaft 2 and the spherical bearings 7a and 7b from the roller shell 3, but at this time, the inner wall of the roller shell 3 is easily damaged,
In addition, running costs will increase due to disassembly and assembly costs.

Further, the provision of the spherical bearings 7a and 7b has a drawback that the number of parts is increased and the inner wall of the central portion of the roller shell 3 in the longitudinal direction needs to be machined with high precision, which increases the internal cost.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet-like material provided with a pressure contact roller which is excellent in high-speed performance and can be manufactured at low cost while satisfying a uniform nip, a small diameter, and vibration absorption. The present invention is to provide a winding device.
It is another object of the present invention to provide a sheet-like material winding device having a pressure-contacting roll that is compatible with equipment having a higher speed and is lightweight and easy to handle.

[0010]

According to the present invention for achieving the above object, there is provided a pressure roller in which a shaft is coaxially inserted into a roller shell and the shaft is connected only at a central portion in the width direction of the roller shell. In a sheet-like material winding device in which a pressing means arranged at both shaft ends of the shaft is in pressure contact with a sheet-like material winding roller or a guide roller, between the roller shell and the shaft in the widthwise central portion. An elastic supporting member made of an elastic material is interposed in the connecting portion so as to fill the gap between the roller shell and the shaft.

With the above structure, when a load is applied to both ends of the shaft of the pressure roller by the pressing means, the load presses the roller shell via the elastic supporting member, and therefore the winding sheet layer is applied to the roller shell. The take-up roller or the guide roller in contact with each other also receives the load from the roller shell and bends in the pressing direction. At this time, since the elastic support member of the pressure contact roller is an elastic body filled only in the central portion in the longitudinal direction of the shaft, the roller shell follows the winding roller or the guide roller and is uniformly curved, so that the roller shell and the winding roller are wound together. The bending curves of the take-up roller and the guide roller coincide with each other, and both rollers are uniformly nipped across the entire width direction through the sheet layer.

When the take-up roller or the guide roller vibrates for some reason, this vibration is propagated from the roller shell to the shaft via the elastic support member, but the roller shell is uniform with the take-up roller or the guide roller. While maintaining the nip, the elastic support member is deformed within the elastic deformation to absorb the vibration. Hereinafter, the present invention will be specifically described with reference to the embodiments in the case of the synthetic resin film winding device shown in FIGS. 1 and 2.

In the figure, 10 is a take-up roller which is rotationally driven by a drive source (not shown), and has bearings 11a,
The synthetic resin film F is supported on the surface 11b and wound up on the surface. The pressure roller 1 is brought into contact with the winding roller 10 via the winding layer so that the synthetic resin film F forms a uniform winding layer.

The pressure contact roller 1 is constructed such that the shaft 2 is inserted into the roller shell 3 concentrically, and the two are connected only at the central portion in the width direction, and the bearings at both ends of the shaft 2 are formed. The pressing means 6a and 6b, which are fluid cylinders provided on the rollers 5a and 5b, press against the take-up roller 10 side, and the roller shell 3 of the press-contact roller 1 and the take-up roller 10 are bent in a concave shape by this pressing.

The pressure contact roller 1 constructed as described above is
As shown in FIG. 3, a large-diameter portion 2a is provided at the center of the shaft 2 in the longitudinal direction.
The elastic support member 4 is interposed between the shaft 2 and the roller shell 3 so as to fill the gap between the shaft 2 and the roller shell 3 in the central region of the length P including the large diameter portion 2a, and the two are connected. As described above, the pressure contact roller 1 has a structure in which only the central portion in the width direction of the roller shell 3 is connected to the shaft 2 by the elastic support member 4. However, as the elastic support member 4, as shown in FIG. It is not necessary to fill the entire widthwise central portion, and as shown in FIG. 4, it may be arranged symmetrically with respect to the widthwise center only at both ends of the widthwise central portion.
At this time, the large-diameter portion 2a has a diameter substantially the same as the inner diameter of the roller shell 3, whereby the natural frequency is designed to be high and the stress concentration on the fitting portion between the shaft 2 and the roller shell 3 is relaxed. You can

Further, as shown in FIG. 5, spherical bearings 7a and 7b are arranged on both sides of the large diameter portion 2a of the shaft 2, and elastic support members 4 are inserted on both sides of the spherical bearings 7a and 7b. You may make it a different structure. As the material of the shaft 2 and the roller shell 3, general structural materials such as carbon steel can be used, but it is more preferable to use fiber reinforced resin or fiber reinforced metal. In particular, when the roller shell is made of carbon fiber reinforced epoxy resin and the shaft is made of carbon fiber reinforced aluminum, the pressure contact roll is made to have a high natural frequency so that it can be applied at high speed, and the weight is reduced to improve the handling.

In the present invention, since the diameter of the shaft 2 has a function of absorbing the vibration from the winding roller 10 by the elastic supporting member 4, the diameter of the pressure contact roller 1 capable of maintaining the winding stability can be prevented. It is better to use a larger diameter in the range, which increases the critical speed and enables faster adaptation. The outer layer of the roller shell 3 is covered with an elastic body 3a such as rubber. However, in the present invention, since the elastic support member 4 absorbs the vibration from the winding roller 10 as described above, it is not an essential condition. The outer diameter D is preferably as small as possible within the range of the natural frequency of the pressure contact roller 1 in order to reduce the diameter.

The filling length P of the elastic supporting member 4 is 5 to 5 of the surface length L of the pressure roller 1 in order to improve the uniform nip property.
It is preferably 0%, and more preferably 10 to 30.
It is good to set it as%. In addition, the filling length P of the elastic support member 4
If the rigidity of the winding roller 10 is relatively high, it is preferably set to a long value within the above range, and conversely, if the rigidity is low, it is preferably set to a small value. The reason will be described below.

Here, in order to facilitate understanding, the roller shell 3 of the present invention is modeled as a simple beam, and the simple beam is installed on the take-up roller 10 having a rubber coating layer having a constant thickness. Consider as a state. First, the filling length P is 5
If it is less than%, the take-up roller 10 also flexes slightly under the load from the beam, but the beam itself becomes close to a state of receiving a uniformly distributed load with only the central portion being supported, and the filling length P On both outer sides, since a reaction force is applied upward from the rubber coating layer, the bending becomes too large and a uniform nip cannot be achieved.

On the contrary, when the filling length P exceeds 50%, the bending of the take-up roller 10 becomes smaller than that of the above-mentioned case of 5%, but the beam is lower than the rubber coating layer with respect to the beam supported at both ends. Since the state becomes closer to the state in which a reaction force due to an evenly distributed load from above to the upper side is received, the bending of the central portion of the beam becomes large in this case as well, and a uniform nip cannot be achieved. After all, when a concentrated load is applied to the beam, that is, the roller shell 3 from the shaft 2 through the elastic support member 4, when a reaction force due to an evenly distributed load is applied from the rubber coating layer of the winding roller 10. It is preferable that the filling length P be the same as the bending of the take-up roller 10. This preferable filling length P is in the above range.

At such a filling length P, the reason why the filling length P is preferably large when the winding roller 10 has a high rigidity is that the load is widely dispersed in this way so that the filling length P is large. This is because the amount of bending between the roller shells 3, that is, the gap between the take-up roller 10 and the roller shell 3 becomes smaller than when the roller shell 3 is narrowed. On the other hand, when the winding roller 10 has a low rigidity, the filling length P is narrowed and the roller shell 3 is largely bent in accordance with the bending curve of the winding roller 10 so that the gap between the two is reduced and the uniform nip is reduced. To be achieved.

In the present invention, the supporting length for supporting the roller shell 3 which receives the reaction force of the pressing force from the winding roller 10 by the shaft 2, that is, the filling length P of the elastic supporting member 4 is the bending curve of the roller shell 3. Even if shortened as necessary, the inner wall of the roller shell 3 and the support portion of the shaft 2 are not damaged. The reason is that the elastic support member 4 is an elastic body, so that the compressive stress is not locally concentrated.

Next, the vibration absorbing function of the pressure contact roller 1 will be described. Generally, the rotating body is designed so that the frequency of use is lower than the natural frequency, and the same applies to the pressure roller 1 of the present invention. Therefore, the natural frequency of the pressure contact roller itself is dominated by the shaft 2 which is longer than the roller shell 3. It is preferably designed to be lower than the natural frequency of the roller.

However, the pressure roller of the present invention may be designed so that the diameter of the shaft 2 is as large as possible, that is, the natural frequency of the pressure roller is high. As a result, axis 2
Since the rigidity of the shaft 2 is also increased, the vibration absorbing function due to the elastic deformation of the shaft 2 itself is deteriorated, but the elastic support member 4 of the shaft 2 that receives the load of the roller shell 3 is eccentric to the winding roller 10 or the pressure contact roller 1 itself. Even if vibration occurs due to deformation, imbalance, etc., the vibration is easily absorbed.

Since the elastic support member 4 may have a small thickness, the diameter of the shaft 2 can be designed to be as large as possible.
As a result, it is possible to obtain a pressing roller having a high natural frequency. On the contrary, when the natural frequency is constant, the diameter of the roller can be further reduced. In addition, when processing the elastic support member, if a liquid injection type material is used and an assembly method that cures in the post processing is adopted, it is not necessary to process the elastic support member with high precision, and it is not necessary to provide special parts. You can

Further, in the present invention, when the shaft 2 and the roller shell 3 are made of a fiber reinforced resin or a fiber reinforced metal, the natural frequency of the pressure roller is increased to improve the high speed rotation performance for the following reason. . Generally, the rigidity of not only a rotating body such as a roller but also a beam, in other words, the natural frequency is a value obtained by dividing the value of the tensile elastic modulus of the material by the specific gravity of the material when comparing the same size and shape. That is, the higher the value of the specific elastic modulus, the higher the value.

[0027]

[Table 1] As shown in Table 1, the fiber reinforced material has a several times higher specific elastic modulus (= tensile elastic modulus / specific gravity) than steel and aluminum, and the pressure contact roll made of this material naturally has high natural vibration. It becomes a number and can be adapted to speeding up. Moreover, since the specific gravity is small, the pressure contact roll is lightened and handling is facilitated.

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 unique to the elastic support member 4 on the beam (shaft 2) supported at both ends by the bearings 5a and 5b. It can be said that it is supported through the spring constant of. Therefore, of the beams supporting the mass body, of the materials having a high specific elastic 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 small specific gravity among materials having a high specific elastic modulus reduces the load on the beam (shaft 2), and the natural vibration of the system as a whole of the pressure contact roller. Higher numbers. That is, as the material used for the roller shell 3, carbon fiber reinforced epoxy resin is more preferable. In addition, by using a fiber reinforced material with a small specific gravity for the pressure roller, it has been reduced in weight,
The ability to follow the vibration from the take-up roller 10 and the ability to follow rotation are also greatly improved.

On the other hand, the fiber reinforced resin or the fiber reinforced metal is inferior to the general metal material in the compressive strength and wear resistance of the surface as compared with its high tensile strength and high elastic modulus. Therefore, due to the difference in the bending curves of the roller shell 3 and the shaft 2, the area of the connecting portion, particularly the boundary portion, is likely to receive a strong frictional force and damage the surface. However, in the present invention, since the elastic supporting member 4 made of an elastic material such as rubber or resin is provided at the boundary portion of the connecting portion, the inner wall of the roller shell 3 and the shaft due to the difference in the bending curves of the roller shell 3 and the shaft 2 are provided. 2 It is possible to eliminate damage on the surface.

In the present invention, the pressing means 6a and 6b for pressing the shaft in the direction of the winding roller are not particularly limited, and any known pressing means such as a hydraulic cylinder or an air cylinder may be used. it can. 1 and 2, the case where the pressure contact roller 1 is pressed against the take-up roller 10 has been described, but the pressure contact roller can also be used as a pressure contact means for a guide roller that simply guides a sheet.

[0032]

EXAMPLE An apparatus according to an embodiment of the present invention shown in FIGS. 1 and 2, an apparatus according to Comparative Example 1 shown in FIG. 6 and a Comparative Example 2 shown in FIG.
Each of the above devices was manufactured, and the operating conditions were set as shown in Table 2, and the results in Table 2 were obtained. Here, whether the uniform nip property used for evaluation is good or bad is large or small in winding hardness unevenness in the width direction of the synthetic resin film F on the take-up roller, or is small or large in winding pressure for decreasing the diameter of the pressure roller, or is vibration absorption. Judged the results of the hardness of the winding and the quality of the winding.

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 K
6301 A class).

[0034]

[Table 2] As is clear from Table 2, in the case of the apparatus of the embodiment of the present invention, all of the uniform nip property, the smaller diameter, the vibration absorbing property, the high speed performance, and the handling property are all excellent.

[0035]

As described above, in the sheet material winding device according to the present invention, the elastic supporting member made of an elastic material is filled in the gap between the shaft and the center of the roller shell of the pressure roller in the width direction. Therefore, the uniform nip property with the winding roller or the guide roller of the sheet-like material is improved. Further, since the elastic support member is capable of absorbing vibration, the shaft diameter can be maximized, and a structure having a high natural frequency can be realized. In other words, if the natural frequency is constant, the diameter can be made smaller. It will be possible. Further, the elastic deformation of the elastic support member makes it possible to absorb the vibration from the other winding roller or guide roller.

Further, high-speed performance is improved by enabling a structure having a high natural frequency, and since the roller shell and the shaft can be connected only by filling the elastic material without requiring high-precision machining, Cost can be produced. Also,
When a fiber reinforced resin or a fiber reinforced metal is used for the roller shell and the shaft, the natural frequency can be increased, the high-speed performance can be further improved significantly, and the weight reduction facilitates handling.

[Brief description of drawings]

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

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

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

FIG. 4 is a vertical cross-sectional view showing another embodiment of the pressure roller used in the sheet-like material winding device of the present invention.

FIG. 5 is a vertical cross-sectional view showing still another embodiment of the pressure contact roller used in the sheet material winding device of the present invention.

FIG. 6 is a schematic vertical sectional view showing a conventional sheet-like material winding device.

FIG. 7 is a schematic vertical cross-sectional view showing another example of a conventional sheet-like material winding device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pressing roller 2 Shaft 3 Roller shell 4 Elastic support members 6a, 6b Pressing means 10 Winding roller F Synthetic resin film (sheet-like material)

Claims (4)

[Claims] 1. A sheet-shaped pressing roller having a shaft coaxially inserted into a roller shell and connected to the shaft only at the widthwise center of the roller shell by pressing means arranged at both shaft ends of the shaft. In a device for winding a sheet-like material in such a manner that it comes into pressure contact with a material winding roller or a guide roller, a gap between the roller shell and the shaft is provided at a connecting portion between the roller shell and the shaft at the center portion in the width direction. For winding a sheet-like material with an elastic supporting member made of an elastic material interposed so as to fill the space. 2. The filling length P of the elastic support member at the center portion in the width direction is equal to 5 of the surface length L of the roller shell.
The winding device for a sheet-like material according to claim 1, wherein the winding amount is -50%. 3. The winding device for a sheet-like material according to claim 1, wherein the roller shell and the shaft are made of fiber reinforced resin or fiber reinforced metal. 4. The sheet-like material winding device according to claim 3, wherein the roller shell is made of carbon fiber reinforced epoxy resin, and the shaft is made of carbon fiber reinforced aluminum.