JP2888139B2 - Sheet winding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, a winding device for a sheet-like material such as a film is used to adjust the hardness of a winding layer by pressing a pressing roller through a sheet-like material onto a winding roller for winding the sheet-like material. They are trying to improve their appearance. The pressing roller for performing the above-described operations is usually required to have the following three technical problems.

First, the pressing roller is in close contact with the sheet-like material on the winding roller over the entire range in the width direction, and is pressed with a uniform nip force. That is, if there is a place where the pressing roller is not uniformly nipped in any of the width directions, unevenness occurs in the amount of air that is caught between the layers of the sheet-like material, causing various winding defects.
Second, the outer diameter of the pressing roller should be reduced as much as possible. This is because if the outer diameter is too large, the amount of air taken in between the layers of the wound sheet-like material increases.
However, since the rigidity of the pressing roller itself is also reduced due to the reduction in diameter, when the journals at both ends of the roller shaft are pressed toward the winding roller, the vicinity of the center of the pressing roller in the width direction is bent in a direction opposite to the pressing direction, and There is a problem that the surface pressure near the center is reduced.

Third, the pressing roller has a function of absorbing vibration of the take-up roller as much as possible. If the vibrations cannot be absorbed, air is intermittently drawn in from a gap formed between the sheet-like material being wound and the pressing roller, causing winding defects. Conventionally, in order to satisfy the above three required characteristics of uniform nip, small diameter, and vibration absorption, for example, Japanese Utility Model Publication No. Hei 2-29076 and Japanese Unexamined Patent Publication No. Hei.
There is a proposal of a pressure contact roller in Japanese Patent Publication No. 2 and the like. The press roller 1 disclosed in Japanese Utility Model Publication No. 2-29076 discloses a roller shell 3 which is connected and fixed only by a central portion S of a shaft 2 having a central portion in the width direction having a large diameter as shown in FIG. When pressed against the take-up roll 10, the take-up layer on the take-up roll 10 is to be uniformly nipped.

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. However, in the region of the connecting portion S itself, the pressing direction depends on the pressing direction. Has a problem in that a convex nip is formed in the opposite direction, a gap is formed between the two rollers, and a completely uniform nip pressure cannot be obtained in the entire width direction. Further, no satisfactory performance was obtained in terms of vibration absorption.

On the other hand, as shown in FIG. 7, a pressing roller 1 proposed in Japanese Patent Application Laid-Open No. 2-66042 has a flexure at a central portion of a shaft by fitting spherical bearings 7a and 7b to a central connecting portion. Is separated from the deflection of the roller shell 3, and the entire roller shell 3 can be made to follow the deflection of the winding roll 10, thereby overcoming the problem of a uniform nip.

However, since the spherical bearings 7a and 7b have a relatively large space occupying in the radial direction, if the outer diameter of the roller shell 3 is fixed, the shaft 2 must be thinned, so that the critical speed is increased. And it becomes impossible to cope with high-speed production equipment. Also,
For maintenance of the pressure roller, 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 increase due to disassembly and assembly costs.

Also, the provision of the spherical bearings 7a and 7b increases the number of parts and requires high precision machining of the inner wall of the roller shell 3 at the central portion in the longitudinal direction.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet-like article having a pressure roller capable of satisfying a uniform nip, a small diameter, and a vibration absorbing property, and further having excellent high-speed performance and low production cost. To provide a winding device.
It is another object of the present invention to provide a sheet winding device having a press-contact roll which is adaptable to an even higher-speed facility, is lightweight and is easy to handle.

[0010]

In order to achieve the above object, the present invention provides a pressing roller in which a shaft is inserted concentrically into a roller shell and the shaft is connected only at the center in the width direction of the roller shell. In a sheet-like material winding device configured to be in pressure contact with a sheet-like material winding roller or a guide roller by pressing means disposed at both shaft ends of a shaft, a gap between the roller shell and a shaft at the center in the width direction is provided. An elastic supporting member made of an elastic material is interposed in the connecting portion of the above to fill a 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 pressing roller by the pressing means, the load presses the roller shell via the elastic supporting member. The take-up roller or the guide roller that is in contact therewith also bends in the pressing direction under the load from the roller shell. At this time, since the elastic supporting member of the pressing roller is an elastic body filled only in the central portion in the longitudinal direction of the shaft, the roller shell follows the take-up roller or the guide roller and is uniformly curved, and the roller shell is wound with the roller shell. The deflection curves of the take-up roller and the guide roller coincide with each other, and the two rollers are uniformly nipped over the entire area in the width direction via the sheet layer.

When the take-up roller or the guide roller vibrates for some reason, the vibration is propagated from the roller shell to the shaft via the elastic support member. While maintaining the nip, the elastic support member deforms within the elastic deformation and absorbs vibration. Hereinafter, the present invention will be described in detail with reference to an embodiment of a winding device for a synthetic resin film shown in FIGS. 1 and 2.

In FIG. 1, reference numeral 10 denotes a take-up roller which is rotationally driven by a drive source (not shown).
11b, the synthetic resin film F is wound up on the surface. The pressure roller 1 comes into pressure contact with the winding roller 10 via the winding layer, so that the synthetic resin film F forms a uniform winding layer.

The pressing roller 1 is configured such that the shaft 2 is inserted concentrically into the roller shell 3 and the two are connected only at the center in the width direction, and bearings at both ends of the shaft 2 are provided. The roller shell 3 of the pressure roller 1 and the winding roller 10 are deflected in a concave shape by the pressing means 6a and 6b, which are fluid cylinders provided on the 5a and 5b, and are pressed toward the winding roller 10.

The pressure roller 1 constructed as described above is
As shown in FIG. 3, a large-diameter portion 2a
The elastic support member 4 is interposed 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. As described above, the pressing roller 1 has a configuration in which only the center portion in the width direction of the roller shell 3 is connected to the shaft 2 by the elastic support member 4, but as the elastic support member 4, as shown in FIG. It is not necessary to fill the entire area in the width direction central portion, and as shown in FIG. 4, it may be arranged only at both ends of the width direction central portion symmetrically with respect to the width direction center.
At this time, the large-diameter portion 2a has substantially the same diameter as the inner diameter of the roller shell 3 so that 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 reduced. Can be.

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. A configuration may be adopted. As the material of the shaft 2 and the roller shell 3, any of 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 roller is made to have a high natural frequency so that it can be applied to high-speed operation, and the handling is improved by reducing the weight.

In the present invention, the diameter of the shaft 2 does not hinder the reduction of the diameter of the pressure contact roller 1 which can maintain the winding stability because the elastic support member 4 has a function of absorbing the vibration from the winding roller 10. The diameter should be large in the range, which increases the critical speed and allows for speed adaptation. The outer layer of the roller shell 3 is covered with an elastic body 3a such as rubber. However, in the present invention, it is not an essential condition because the elastic support member 4 absorbs the vibration from the winding roller 10 as described above. The outer diameter D preferably takes a value as small as possible within the range of the natural frequency of the entire pressure contact roller 1 in order to reduce the diameter.

The filling length P of the elastic supporting member 4 must be 5 to 5 times the surface length L of the pressing roll 1 in order to improve the uniform nip property.
It is preferably set to 0%, more preferably 10 to 30%.
%. Also, the filling length P of the elastic support member 4
When the rigidity of the take-up roller 10 is relatively high, it is preferable to set the length longer even in the above range, and conversely, when the rigidity is low, it is preferable to set the length smaller. The reason will be described below.

Here, in order to facilitate understanding, the entire roller shell 3 of the present invention is modeled as a simple beam, and this simple beam is set on a winding roller 10 having a rubber coating layer having a constant thickness. Consider as a state. First, the filling length P is 5
%, The take-up roller 10 also slightly bends under the load from the beam, but the beam itself approaches the state of receiving an evenly distributed load with only the center portion supported, and the filling length P On both outer sides, the rubber coating layer receives an upward reaction force, so that the bending becomes too large to achieve a uniform nip.

Conversely, when the filling length P exceeds 50%, the deflection of the take-up roller 10 is smaller than that in the case of 5%, but the beam is lowered from the rubber coating layer to the beam supported at both ends. In this case, the bending force at the center of the beam increases, and the 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 via the elastic supporting member 4, a reaction force due to a uniform distribution load is applied from the rubber coating layer of the winding roller 10. The filling length P at which the deflection is equivalent to the deflection of the winding roller 10 is preferable. This preferable filling length P is in the above range.

In such a filling length P, when the winding roller 10 has a high rigidity, the larger the filling length P is, the better the dispersion of the load is. This is because the amount of deflection between the roller shells 3, that is, the gap between the take-up roller 10 and the roller shell 3 is smaller than when the roller shell 3 is narrowed. On the other hand, when the stiffness of the winding roller 10 is low, the filling length P is narrowed, and the roller shell 3 is also largely bent in accordance with the bending curve of the winding roller 10, so that the gap between them is reduced and the uniform nip is reduced. Achieved.

In the present invention, the supporting length of the roller shell 3 receiving 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 determined by the bending curve of the roller shell 3. Even if the length is shortened as required, the inner wall of the roller shell 3 and the support of the shaft 2 are not damaged. The reason is that since the elastic support member 4 is an elastic body, the compressive stress is not locally concentrated.

Next, the vibration absorbing function of the pressing roller 1 will be described. In general, the rotating body is designed such 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, since the influence of the shaft 2 which is longer than that of the roller shell 3 is dominant on the natural frequency of the pressing roller itself, the shaft 2 It is preferable to design so as to be lower than the natural frequency of the roller.

However, the pressing 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 pressing roller is increased. As a result, axis 2
Of the shaft 2 itself, the vibration absorbing function of the shaft 2 itself is reduced, but the elastic support member 4 of the shaft 2 which receives the load of the roller shell 3 is eccentric of the winding roller 10 or the pressing roller 1 itself. Even if vibrations due to deformation, unbalance, etc. occur, the vibrations are easily absorbed.

Since the thickness of the elastic supporting member 4 can be small and the diameter of the shaft 2 can be designed to be as large as possible,
As a result, a pressure roller having a high natural frequency can be obtained. Conversely, when the natural frequency is fixed, the roller diameter can be further reduced. In addition, when the elastic support member is processed using a liquid injection type material and an assembling method that is hardened by post-processing, there is no need to precisely process the elastic support member and no need to provide special parts. Can be.

In the present invention, when fiber reinforced resin or fiber reinforced metal is used for the shaft 2 and the roller shell 3, the reason why the natural frequency of the pressure roller is increased to improve the high-speed rotation performance is as follows. . Generally, the rigidity of the beam is not limited to a rotating body such as a roller, in other words, the natural frequency is the value obtained by dividing the value of the tensile modulus of the material by the specific gravity of the material when compared with the same size and the same 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 specific elastic modulus (= tensile elastic modulus / specific gravity) several times higher than that of steel or aluminum, and the press roll made of this material naturally has higher natural vibration. It becomes possible to adapt to speeding up. In addition, since the value of the specific gravity is small, the weight of the pressing roll is reduced, and handling becomes easy.

In the case where the entire pressure roller having the structure of the present invention is modeled as a beam, the mass of the roller shell 3 is added to the beam (shaft 2) whose both ends are supported by the bearings 5a and 5b. Can be said to be supported through the spring constant of Accordingly, among the materials supporting the mass body, among materials having a high specific elastic modulus, a material having a particularly high tensile elastic modulus has a smaller deflection against 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 other hand, among the materials having a high specific elastic modulus, the material of the roller shell 3, which has a low specific gravity, reduces the load on the beam (the shaft 2), and the natural vibration of the system as a whole of the pressing roller. The number gets higher. That is, the material used for the roller shell 3 is more preferably a carbon fiber reinforced epoxy resin. In addition, by using a fiber reinforced material with a small specific gravity for the pressure roller, the weight has been reduced,
The ability to follow the vibration from the winding roller 10 and the ability to follow the rotation are greatly improved.

On the other hand, the fiber reinforced resin or the fiber reinforced metal is inferior in the compressive strength and abrasion resistance of the surface as compared with a general metal material in comparison with the high tensile strength and the high elastic modulus. For this reason, the surface of the connecting portion, particularly the boundary portion, receives a strong frictional force due to the difference in the bending curve between the roller shell 3 and the shaft 2, and the surface is easily damaged. 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 of the connecting portion, the inner wall and the shaft of the roller shell 3 due to the difference in the bending curve between the roller shell 3 and the shaft 2 are provided. (2) Damage to the surface can be eliminated.

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 roller 1 is pressed against the winding roller 10 has been described. However, the pressure roller can also be used simply as pressure means for a guide roller for guiding a sheet-like material.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the embodiment of the present invention shown in FIGS. 1 and 2, the apparatus of Comparative Example 1 shown in FIG. 6, and the Comparative Example 2 shown in FIG.
Were manufactured, and the conditions thereof were set as shown in Table 2, and the results in Table 2 were obtained. Here, regarding the quality of the uniform nip property used in the evaluation, the size of the unevenness of the winding hardness in the width direction of the synthetic resin film F in the winding roller, the reduction in the diameter of the pressure contact roller, the size of the winding hardness, the vibration absorption Determined the magnitude of the hardness of the roll and the quality of the roll.

The synthetic resin film F has a thickness of 10 μm.
Using a polyester film having a thickness of m, the unevenness of the winding hardness and the winding hardness in the width direction can be measured with a spring-type hardness tester (JIS K
6301 Class A).

[0034]

[Table 2] As is clear from Table 2, in the case of the apparatus according to the present invention, all of the uniform nip property, the reduction in diameter, the vibration absorption property, the high-speed performance, and the handling property are all excellent.

[0035]

As described above, in the sheet winding apparatus according to the present invention, the elastic support member made of an elastic material is filled in the gap between the shaft and the center in the width direction of the roller shell of the pressing roller. Therefore, the uniform nip property of the sheet with the take-up roller or the guide roller is improved. In addition, since the vibration absorption is made possible by the elastic support member, the shaft diameter can be made as large as possible, and a configuration having a high natural frequency can be realized. In other words, if the natural frequency is constant, the diameter can be made smaller. It becomes possible. In addition, the elastic deformation of the elastic supporting member enables the vibration from the other take-up roller or guide roller to be absorbed.

Further, the high-speed performance is improved by enabling a configuration having a high natural frequency, and the roller shell and the shaft can be connected only by filling the elastic material without requiring high-precision processing, so that a low-speed operation can be achieved. Production of cost becomes possible. 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 greatly increased, and the handling is facilitated by reducing the weight.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal 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.

FIG. 3 is a longitudinal sectional view of a pressing roller used in the winding device of FIG. 1;

FIG. 4 is a longitudinal sectional view showing another embodiment of the pressure roller used in the sheet winding device of the present invention.

FIG. 5 is a longitudinal sectional view showing still another embodiment of the pressing roller used in the sheet winding device of the present invention.

FIG. 6 is a schematic longitudinal sectional view showing a conventional sheet winding device.

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

[Explanation of symbols]

REFERENCE SIGNS LIST 1 pressure roller 2 shaft 3 roller shell 4 elastic support member 6a, 6b pressing means 10 winding roller F synthetic resin film (sheet-like material)

Continuation of the front page (56) References JP-A-2-66042 (JP, A) JP-A-62-296052 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B65H 18 / 00-18/28 B65H 27/00

Claims (4)

(57) [Claims] 1. A pressing roller in which a shaft is inserted concentrically into a roller shell and the shaft is connected only at the center in the width direction of the roller shell, and is formed into a sheet-like shape by pressing means disposed at both shaft ends of the shaft. In the sheet winding device configured to be brought 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 in the width direction. For winding a sheet-like material with an elastic support member made of an elastic material interposed so as to fill the sheet. 2. A filling length P of the elastic supporting member at the center in the width direction is set to a value equal to 5 of a surface length L of the roller shell.
The sheet winding device according to claim 1, wherein the ratio is set to 50%. 3. The sheet winding device according to claim 1, wherein the roller shell and the shaft are made of fiber reinforced resin or fiber reinforced metal. 4. The sheet 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.