A method and mechanism for supporting rollers, and a web conveying device using the same.

Abstract

To provide a support method and support mechanism for a roller enabling minute adjustment while greatly changing a natural frequency, and a web transport device using the same.SOLUTION: A support method for a roller of the present invention is a method for supporting a one-sided shaft of a roller at a first support position and at least one second support position in a direction toward an end of the shaft with respect to the first support position, the method comprising, when it is confirmed that the roller is resonating, changing a state of the shaft from supported to unsupported, or from unsupported to supported, at the second support position.SELECTED DRAWING: Figure 14

Description

Technical Field

[0001] The present invention relates to a support mechanism for rollers mounted on a conveying device for long and thin materials such as paper, cloth, plastic film, metal foil, thin steel plates, etc. (hereinafter referred to as webs), and a method for supporting rollers using the support mechanism.

Background Art

[0002] Among devices for conveying webs, there are many devices that convey a web while sandwiching it using two rollers for purposes such as tension cut that divides the upstream and downstream tensions, web thickness control, and blocking of the accompanying flow when performing surface treatment on the web. In the paper manufacturing industry, there are press rollers of paper machines, in the steel industry, rolling rollers, and in the film forming industry, nip rollers of corona treatment devices, etc.

[0003] In a web conveying device that conveys a web while sandwiching it using two rollers as described above, it is known that resonance occurs when the rotational frequency of the roller coincides with or approaches the natural vibration frequency of the web conveying device under specific conditions, and the rollers constituting the device vibrate. When the vibration increases due to resonance, it leads to defective processing of the web and mechanical failures.

[0004] In response to such problems, in Patent Document 1, a technique is proposed in which the vibration mode of the roller is specified, and when resonance in a specific vibration mode is detected, the natural vibration frequency of the web conveying device is changed to avoid resonance. Also, as a means for adjusting the natural vibration frequency, it is proposed that a method of controlling the amount of rubber compression by adjusting the surface pressure of the nip roller can be preferably used.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] However, since surface pressure is one of the operating conditions and has a narrow adjustable range, the technology disclosed in Patent Document 1 has the problem that the adjustment range for the natural frequency is narrow and resonance cannot be completely avoided.

[0007] Therefore, the present invention solves the above problems and provides a roller support method and support mechanism that allows for fine adjustment while changing the natural frequency without changing operating conditions such as surface pressure, as well as a web conveying device using the same. [Means for solving the problem]

[0008] [1] The present invention provides a method for supporting a roller that solves the above problems, comprising supporting one side of the axis of the roller at a first support position and at least one second support position in a direction toward the end of the axis from the first support position, When it is confirmed that the roller is resonating, the state in which the shaft is supported at the second support position is changed from a state where the shaft is supported to a state where it is not supported, or from a state where the shaft is not supported to a state where it is supported.

[0009] [2] Another embodiment of the present invention for supporting a roller that solves the above problems is a method of supporting one side of the axis of the roller at a first support position and at least one second support position in a direction toward the end of the axis from the first support position, When it is confirmed that the roller is resonating, the second support position is changed to the longitudinal direction of the shaft, or the rigidity of the support part supporting the second support position is changed.

[0010] [3] The roller support mechanism of the present invention is a mechanism that supports the axis on one side of the roller, A first support part that supports the above shaft, At a point further toward the end of the shaft than the first support portion, there is at least one second support portion that can change between supporting the shaft and not supporting it, It is equipped with.

[0011] [4] Another embodiment of the present invention is a roller support mechanism that supports one side of the axis of a roller, A first support part that supports the above shaft, The system comprises at least one second support portion that supports the shaft at a location in a direction toward the end of the shaft from the first support portion described above, The second support portion can be modified to change the location at which it supports the shaft in the longitudinal direction, or its rigidity can be modified.

[0012] [5] The roller support mechanism described in [4] above preferably has an elastic member in the second support portion that presses against and supports the shaft.

[0013] [6] The web conveying device of the present invention comprises a roller having at least one of a double-tube core, an internal crown structure rubber coating, or an internal inverted crown structure rubber coating, It comprises a support mechanism for two rollers, each supporting one side of the axis of the roller, At least one of the two roller support mechanisms described above is one of the roller support mechanisms described in [3] to [5] above.

[0014] [7] The web conveying device described in [6] above preferably has nip rollers.

[0015] [Explanation of terms] Next, the meaning of each term used in this invention will be explained. A "support mechanism" refers to a component or device that supports a roller so that it can rotate freely. This includes components with operating mechanisms, such as a swivel arm.

[0016] A "web conveying device" refers to a device that moves a web from upstream to downstream in the longitudinal direction. This includes not only conveying devices consisting of a single roller, but also conveying devices consisting of multiple rollers.

[0017] The "first support part" refers to the part in the direction towards the center of the axis of the roller, which is closer to the center of the axis of the roller than the second support part described later, and is a support part that always supports the axis of the roller at the same position.

[0018] The "second support part" refers to the part in the direction towards the end of the axis of the roller, which is closer to the end of the axis of the roller than the first support part, and is a support part that supports the axis of the roller, and has one of the separation support mechanism, the movement support mechanism, the rigidity adjustment mechanism, or a mechanism combining these. The second support part may be provided only one on one side of the axis of the roller, or may be provided in plural.

[0019] The "first support position" refers to the part that supports the axis with the first support part.

[0020] The "second support position" refers to the part that supports the axis with the second support part.

[0021] "When it is confirmed that the roller is resonating" means when it can be confirmed that at least one roller included in the web conveying device is resonating. There is no limit to the method of confirming resonance. For example, it means when monitoring the displacement of the roller surface or the acceleration of the arm and the support part using a laser displacement meter or an acceleration sensor, and exceeding a preset value.

[0022] "Changing from the state of supporting the axis to the state of not supporting it, or from the state of not supporting the axis to the state of supporting it", and "being able to change the state of supporting the axis and the state of not supporting it" refer to connecting or separating the roller and the base or the frame, or a mechanism that realizes these. For example, a mechanism for connecting or separating the axis of the roller and the support part as shown in FIG. 1 and FIG. 2, a mechanism for connecting or separating the axis of the roller itself as shown in FIG. 3, and a mechanism for connecting or separating the support part itself as shown in FIG. 4 are also included.

[0023] "Changing in the longitudinal direction of the shaft" or "being able to change the location where the shaft is supported in the longitudinal direction" refers to moving the connection part between the roller shaft and the support part with respect to the longitudinal direction of the roller shaft, or a mechanism that can be moved. For example, it includes a mechanism that can move the position of the bearing contacting the roller shaft as shown in FIG. 5, and a mechanism that has a member between the roller shaft and the bearing as shown in FIG. 6 and can move the position of that member. Also, the connection part between the roller shaft and the support mechanism includes not only shafts of the same diameter but also connecting to shafts with different diameters.

[0024] "Changing the rigidity of the support part" or "being able to change the rigidity of the support part" refers to changing the rigidity when the support part is regarded as a single spring, or a mechanism that can adjust the rigidity. The part for adjusting the rigidity may be a part of the support part or the whole. For example, it includes a mechanism that can adjust the rigidity by having an elastic body member such as rubber in the support part and controlling its deformation amount as shown in FIG. 7, and a mechanism that has replaceable members in the support part and can be replaced with members of different materials and structures as shown in FIG. 8.

[0025] "Elastic body member" refers to an object that deforms when a force is applied and returns to its original shape when the force is removed. There is no limitation on Young's modulus or shape, and for example, it refers to rubber or a spring.

[0026] "Double tube structure" refers to a structure that includes a hollow cylindrical outer tube member and a central axis arranged coaxially with the outer tube member, and the outer tube member and the central axis are connected at the longitudinal center of the outer tube member.

[0027] "Internal crown structure" refers to a roller having at least one rubber layer, having a single rubber layer, with the outer diameter of the roller mandrel decreasing sequentially from the central part to both ends, or having two or more rubber layers, and at least one rubber layer of the inner layer is wound so that its thickness decreases sequentially from the central part to both ends in the longitudinal direction of the roller. Also, when having two or more rubber layers, the hardness of the rubber layer has the characteristic that the rubber hardness of the outermost layer is lower in the layer wound so that its thickness decreases sequentially from the central part to both ends of the inner layer.

[0028] An "internal inverted crown structure" refers to a structure having two or more rubber layers, in which at least one of the inner layers is wound so that its thickness gradually increases from the center to both ends in the longitudinal direction of the roller. Furthermore, the rubber hardness of the outermost layer is higher than that of the inner layers wound so that their thickness gradually increases from the center to both ends. [Effects of the Invention]

[0029] According to the roller support method of the present invention, it is possible to fine-tune the natural frequency of the web conveying device while changing operating conditions such as surface pressure, thereby avoiding resonance. Furthermore, according to the roller support mechanism of the present invention, the roller support method of the present invention can be realized. [Brief explanation of the drawing]

[0030] [Figure 1] This is a schematic side view showing one embodiment of the roller support mechanism of the present invention, which includes a second support part having a separation support mechanism. [Figure 2] This is a schematic side view showing another embodiment of the roller support mechanism of the present invention, which includes a second support section having a separation support mechanism. [Figure 3] This is a schematic side view showing yet another embodiment of the roller support mechanism of the present invention, which includes a second support part having a separation support mechanism. [Figure 4] This is a schematic side view showing yet another embodiment of the roller support mechanism of the present invention, which includes a second support part having a separation support mechanism. [Figure 5] This is a schematic side view showing one embodiment of the roller support mechanism of the present invention, which includes a second support part having a movable support mechanism. [Figure 6] This is a schematic side view showing another embodiment of the roller support mechanism of the present invention, which includes a second support section having a movable support mechanism. [Figure 7] This is a schematic side view showing one embodiment of the roller support mechanism of the present invention, which includes a second support part having a rigidity adjustment mechanism. [Figure 8] This is a schematic side view showing another embodiment of the roller support mechanism of the present invention, which includes a second support part having a rigidity adjustment mechanism. [Figure 9] This is a schematic side view showing one embodiment of the roller support mechanism of the present invention, which includes a second support section having a separation support mechanism and a movable support mechanism. [Figure 10] This is a schematic side view showing one embodiment of the roller support mechanism of the present invention, which includes a second support section having a movable support mechanism and a rigidity adjustment mechanism. [Figure 11] This is a schematic side view showing one embodiment of the roller support mechanism of the present invention, which includes a second support section having a separation support mechanism and a rigidity adjustment mechanism. [Figure 12] This is a schematic side view showing one embodiment of the roller support mechanism of the present invention, which includes a second support section having a separation support mechanism and a movable support mechanism. [Figure 13] This is a schematic side view showing one embodiment of the roller support mechanism of the present invention, which includes a second support section having a separation support mechanism, a movable support mechanism, and a rigidity adjustment mechanism. [Figure 14] This is a schematic side view showing another embodiment of the roller support mechanism of the present invention, which includes a second support section having a separation support mechanism, a movable support mechanism, and a rigidity adjustment mechanism. [Figure 15] This is a schematic side view showing the application of the roller support mechanism of the present invention to the nip roller in the corona treatment process. [Modes for carrying out the invention]

[0031] Examples of embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to these examples.

[0032] Figure 1 shows a schematic cross-sectional view of one embodiment of the roller support mechanism of the present invention. Note that only the main parts are shown in Figure 1, and utility piping, rotational drive means, etc. are omitted.

[0033] [Second support part with a separation support mechanism] The roller support mechanism of the present invention supports one side of the axis of the roller 1. The roller support mechanism of the present invention comprises at least one support portion that rotatably and permanently supports the axis of the roller 1. Hereinafter, this support portion will be referred to as the first support portion 30.

[0034] The inventors have found that by supporting the portion of the web conveying device that is further toward the end of the shaft than the first support portion 30 with one or more additional support portions, the natural frequency of the web conveying device increases significantly, and by reducing the number of support portions, the natural frequency decreases significantly. The structure of this roller support mechanism will be described with reference to the drawings.

[0035] Refer to Figure 1. The roller support mechanism in Figure 1 is a mechanism that supports one side of the axis of the roller 1. This roller support mechanism includes a first support part 30 that constantly supports the axis of the roller 1, and a second support part 31 that can change between supporting and not supporting the axis of the roller 1 at at least one location in the direction toward the end of the axis of the roller 1 from the first support part 30. Hereinafter, the part of the axis of the roller 1 that is supported by the first support part 30 will be referred to as the first support position 40, and the part that is supported by the second support part 31 will be referred to as the second support position 41.

[0036] In the embodiment shown in Figure 1, there is one second support portion 31, but there may be multiple second support portions 31. Hereinafter, the mechanism that can change between a state in which the shaft is supported and a state in which it is not supported will be referred to as the separation support mechanism 32.

[0037] The separation support mechanism 32 refers to the entire mechanism for connecting or separating the roller 1 from the foundation or frame, and includes mechanisms for connecting or separating the shaft of the roller 1 from the second support part 31, mechanisms for connecting or separating the shaft of the roller 1 itself, and mechanisms for connecting or separating the second support part 31 itself.

[0038] In addition to Figure 1, Figures 2 to 4 also show examples of embodiments of the separation support mechanism 32. The separation support mechanism 32 in Figure 1 has a tapered end to the shaft of the roller 1, and by moving a member that conforms to the shape of the shaft in the longitudinal direction of the shaft, the shaft of the roller 1 and the second support part 31 can be connected and separated at a predetermined position. The separation support mechanism 32 in Figure 2 is another form of a mechanism that can connect and separate the shaft of the roller 1 and the second support part 31, and unlike the mechanism in Figure 1, the shaft of the roller 1 is supported by the outer ring of the bearing 2. The separation support mechanism 32 in Figure 3 is a mechanism that can connect and separate the shaft of the roller 1 itself. The mechanism that can connect and separate the shaft itself is not particularly limited, but for example, couplings and flange fastenings can be used. Among these, couplings that allow for misalignment of the rotation axes of the shafts can be preferably used. The separation support mechanism 32 in Figure 4 is a mechanism that can connect and separate the second support part 31 itself. The mechanism shown in Figure 4 consists of an arm 4, which is fastened with two main components using bolts 7. This mechanism allows the roller 1 to be connected to and separated from the foundation or frame by attaching and detaching the bolts.

[0039] [Separation support method] A method for avoiding resonance of the roller 1 using a roller support mechanism equipped with a second support part 31 having the separation support mechanism 32 described above will be explained. When resonance of the roller 1 is confirmed, the separation support mechanism 32 of the second support part 31 is activated to change the state from supporting the axis of the roller 1 at the second support position 41 to not supporting it, or from the state of not supporting the axis to supporting it at the second support position 41, thereby avoiding resonance of the roller 1. This method of supporting the axis of the roller 1 is called the separation support method.

[0040] The method for confirming the resonance of the roller 1 is not particularly limited, but for example, a method can be used in which the displacement of the surface of the roller 1 and the acceleration of the arm 4 of the first support part 30 are monitored using a laser displacement meter or an acceleration sensor 10 and compared with a preset value.

[0041] When it is confirmed that roller 1 is resonating, the separation support mechanism 32 is activated at the second support section 31, which significantly changes the natural frequency of the web conveying device, thereby preventing resonance early and preventing equipment failure.

[0042] [Second support section with a movable support mechanism] The inventors have also discovered that the natural frequency of the web conveying device can be finely adjusted by changing the support point of the second support part 31 in the direction toward the end of the shaft from the first support part 30. The structure of this roller support mechanism will be explained with reference to the drawings.

[0043] Refer to Figure 5. The roller support mechanism in Figure 5 is a mechanism that supports one side of the axis of the roller 1. This roller support mechanism includes a first support part 30 that constantly supports the axis of the roller 1, and a second support part 31 that can change the point of support in the longitudinal direction of the axis of the roller 1 at at least one point in the direction toward the end of the axis of the roller 1 from the first support part 30. Hereinafter, this mechanism that can change the point of support of the axis will be referred to as the movable support mechanism 33.

[0044] The movable support mechanism 33 refers to a mechanism that moves the connection between the shaft and the second support part with respect to the longitudinal direction of the shaft of the roller 1, and includes a mechanism that moves the position of the bearing 2 that is in contact with the shaft, and a mechanism that interposes a member between the shaft and the bearing 2 and moves the position of that member.

[0045] Referring to both Figure 5 and Figure 6, an example of an embodiment of the movable support mechanism 33 is shown. In the movable support mechanism 33 of Figure 5, the shaft of the roller 1 is supported by the inner ring of the bearing 2, and the outer ring of the bearing 2 is supported by an arm 4 equipped with a movable mechanism 8. The shaft and the bearing 2 are not fixed together, and by operating the movable mechanism 8, the point at which the shaft is supported can be changed within the range of R2. The movable mechanism 8 can suitably use commercially available linear guides, combinations of linear bearings and shafts, rack and pinion, ball screws, etc. In the movable support mechanism 33 of Figure 6, there are three members: the bearing 2, the shaft and bearing connecting member 22, and the bearing and arm connecting member 23, and these three members are supported by the arm 4. Of the three members, the shaft and bearing connecting member 22 and the bearing and arm connecting member 23 are movable in the longitudinal direction of the shaft, and the point of support can be changed within the range of R2.

[0046] [Movement support method] A method for avoiding resonance of the roller 1 using a roller support mechanism equipped with a second support part 31 having the above-described movable support mechanism 33 will now be explained. When resonance of the roller 1 is confirmed, the movable support mechanism 33 of the second support part 31 is activated, and the second support position is changed in the longitudinal direction of the axis, thereby avoiding resonance of the roller 1. This method of supporting the axis of the roller 1 is called a movable support method.

[0047] [Second support section with rigidity adjustment mechanism] The inventors have also discovered that the natural frequency of the web conveying device can be finely adjusted by changing the rigidity of the second support portion 31 at a point in the direction toward the end of the shaft from the first support portion 30. The structure of this roller support mechanism will be described with reference to the drawings.

[0048] Refer to Figure 7. The roller support mechanism in Figure 7 is a mechanism that supports one side of the axis of the roller 1. This roller support mechanism includes a first support part 30 that constantly supports the axis of the roller 1, and a second support part 31 that can change the rigidity of the support part at least at one point in the direction toward the end of the axis of the roller 1 from the first support part 30. Hereinafter, this mechanism for changing rigidity will be referred to as the rigidity adjustment mechanism 34.

[0049] The stiffness adjustment mechanism 34 refers to a mechanism that can change the stiffness of the second support part 31 when it is considered as a single spring. The part that adjusts the stiffness may be a part of the second support part 31 or the whole of it. As a stiffness adjustment mechanism, for example, a mechanism can be used in which an elastic member 6 such as rubber is attached to the second support part 31 and the amount of deformation is controlled to adjust the stiffness, or a mechanism can be used in which a replaceable member 9 is attached to the second support part 31 and replaced with a member of a different material or structure.

[0050] Referring to both Figure 7 and Figure 8, an example of an embodiment of the stiffness adjustment mechanism 34 is shown. The stiffness adjustment mechanism 34 in Figure 7 is a mechanism using an elastic member 6. The shaft of the roller 1 is supported by the outer ring of the bearing 2, and the elastic member 6 and bolt 7 are attached to the arm 4 that supports the bearing 2. By extending the bolt 7, the elastic member 6 is compressed, increasing the stiffness, and by shortening the bolt 7, the elastic member 6 returns to its original shape, weakening the stiffness. There are no particular limitations on the material or structure of the elastic member 6, but for example, rubber or springs can be used. The stiffness adjustment mechanism 34 in Figure 8 has a connecting member 22 between the shaft of the roller 1 and the bearing, and the connecting member 22 is a replaceable member 9 that can be replaced. The material of the replaceable member 9 is not particularly limited, but in addition to metal materials such as carbon steel, stainless steel, and aluminum alloy, as well as general mechanical structural materials such as plastics and fiber-reinforced resins, elastic members 6 such as rubber and springs can be used as appropriate. Furthermore, the structure of the replaceable member 9 is not particularly limited, but members with different cross-sectional area, thickness, shape, etc. can be used as appropriate.

[0051] [Stiffness adjustment method] A method for avoiding resonance of the roller 1 using a roller support mechanism equipped with a second support part 31 having the stiffness adjustment mechanism 34 described above will be explained. When resonance of the roller 1 is confirmed, the stiffness adjustment mechanism 34 of the second support part 31 is activated to change the stiffness of the support part supporting the second support position, thereby avoiding resonance of the roller 1. This method of supporting the axis of the roller 1 is called a stiffness adjustment method.

[0052] When it is confirmed that roller 1 is resonating, the movable support mechanism 33 and the rigidity adjustment mechanism 34 are activated at the second support section 31, thereby changing the natural frequency of the web conveying device, which allows resonance to be avoided early and prevents equipment failure.

[0053] [Second support section with a complex support mechanism] The roller support mechanism of the present invention may also use a mechanism that combines a separation support mechanism 32, a movable support mechanism 33, and a rigidity adjustment mechanism 34. A composite mechanism combining these will be described with reference to the drawings.

[0054] Refer to Figures 9-11. Figure 9 is an example of a second support section 31 having a mechanism that combines a separation support mechanism 32 and a movable support mechanism 33. Figure 10 is an example of a second support section 31 having a mechanism that combines a movable support mechanism 33 and a rigidity adjustment mechanism 34. Figure 11 is an example of a second support section 31 having a mechanism that combines a separation support mechanism 32 and a rigidity adjustment mechanism 34.

[0055] Refer to Figure 12. In Figure 12, the second support part 31 connects or disconnects the axis of the roller 1 from the foundation or frame as the movable support mechanism 33 moves in the longitudinal direction of the axis of the roller 1. Specifically, if the movement range of the second support part 31 is within the range of R2, the second support part 31 supports the axis, and if the movement range is within the range of R1, it does not support the axis. This configuration is also included in the mechanism that combines the separation support mechanism 32 and the movable support mechanism 33.

[0056] Refer to Figure 13. The second support section 31 in Figure 13 is an example that uses all of the separation support mechanism 32, the movable support mechanism 33, and the rigidity adjustment mechanism 34. The second support section 31 in Figure 13 is composed of three members: a bearing 2, a connecting member 22 between the shaft of the roller 1 and the bearing, and a connecting member 23 between the bearing and the arm. Each member is connected by fitting together tapered sections. By assembling each member within the range of R2, the second support section 31 supports the shaft, and by separating each member, the second support section 31 does not support the shaft, thus including elements of the separation support mechanism 32. In addition, the connecting member 22 between the shaft and the bearing is movable in the longitudinal direction of the shaft, and thus also includes elements of the movable support mechanism 33. Furthermore, by using members of different materials for the connecting member 22 between the shaft and the bearing, and the connecting member 23 between the bearing and the arm, it also includes elements of the rigidity adjustment mechanism 34.

[0057] Refer to Figure 14. The second support section 31 in Figure 14 shows another form of an example using all of the separation support mechanism 32, the movable support mechanism 33, and the rigidity adjustment mechanism 34. The second support section 31 in Figure 14 is composed of three members: a bearing 2, a connecting member 22 between the shaft of the roller 1 and the bearing, and a connecting member 23 between the bearing and the arm. The connecting member 22 between the shaft and the bearing and the connecting member 23 between the bearing and the arm have elastic members 6, and are connected by deforming the elastic members 6 using bolts 7. By assembling each member within the range of R2, the second support section 31 supports the shaft, and by separating each member, the second support section 31 does not support the shaft, thus including elements of the separation support mechanism 32. In addition, the connecting member 22 between the shaft and the bearing is movable in the longitudinal direction of the shaft, and also includes elements of the movable support mechanism 33. Furthermore, the amount of deformation of the elastic member 6 can be adjusted using bolts 7, and also includes elements of the rigidity adjustment mechanism 34.

[0058] The first support section 30 and the second support section 31 can be, for example, a bearing 2 fitted onto the shaft of the roller 1 and the bearing 2 supported by an arm 4 or frame, or two bearings 2, each with a shaft fitted into its inner ring, can be placed side by side to support the shaft, and the roller 1 can be supported by resting it on the outer rings of these bearings 2.

[0059] The type of bearing 2 used in the first support section 30 and the second support section 31 is not particularly limited, but ball bearings and roller bearings can be used, and the type can be appropriately changed to deep groove bearings, angular contact bearings, self-aligning bearings, etc. Among these, self-aligning bearings 2 that can accommodate bending deformation of the roller 1 and misalignment of the axis of rotation between the shaft and the arm 4 are preferably used.

[0060] In this invention, arm 4 refers to a set of members that support the bearing 2 that supports the axis of roller 1. Arm 4 may be fixed to a foundation or frame, or it may have a pivotable operating mechanism. The operating mechanism of arm 4 is not particularly limited, but for example, an air cylinder using air as the working fluid, an oil cylinder using oil, an air-hydraulic cylinder using air and oil on the primary and secondary sides respectively, or a linear motor system using an electromagnet can be used as appropriate.

[0061] The material of the first support part 30 and the second support part 31 is not particularly limited, but metal materials such as carbon steel, stainless steel, and aluminum alloy, as well as general mechanical structural materials such as plastics and fiber-reinforced resins, can be used as appropriate.

[0062] The split support mechanism 32, the movable support mechanism 33, and the rigidity adjustment mechanism 34 may be operated manually or automatically. It is preferable that they be operated automatically so that the natural frequency can be changed during operation when resonance is detected.

[0063] The roller 1 targeted by this invention is not particularly limited in size, but is preferably a relatively large roller with an outer diameter of 100 mm to 1000 mm and a face length of 1 m to 10 m. Examples include rollers used in papermaking equipment, plastic film manufacturing equipment, metal strip rolling equipment, and post-processing equipment such as coating and vapor deposition of web strips, as well as rollers used in printing equipment and copying equipment. Furthermore, it is applicable to almost any type of roller, including guide rollers, nip rollers, and receiving rollers.

[0064] The outer diameter of the roller 1 may be constant along its longitudinal direction, or it may have a so-called crown shape where the outer diameter gradually decreases from the center to the ends, or it may have a so-called concave shape where the outer diameter gradually increases from the center to the ends. The surface may also be flat or it may have grooves.

[0065] The material of the core metal of roller 1 is not particularly limited, but metal materials such as carbon steel, stainless steel, and aluminum alloy, or carbon fiber composite materials using carbon fiber as a reinforcing material and resin as the base material can be used as appropriate.

[0066] The material of the coating of roller 1 is not particularly limited, but it may be coated with rubber to increase friction with the web. The type of rubber is not particularly limited, but can be appropriately used depending on the purpose of use and environment from, for example, natural rubber, nitrile rubber, chloroprene rubber, ethylene propylene rubber, silicone rubber, chlorosulfonated polyethylene rubber, urethane rubber, fluororubber, and mixtures thereof. Furthermore, the rubber layer may be a single layer or a multilayer layer such as two or three layers.

[0067] In particular, when applying the present invention to a web conveying device that conveys a web while gripping it with two rollers, it is preferable to cover the roller 1 with rubber having an internal crown shape or an internal inverted crown shape, and it is even preferable that the roller 1 covered with the rubber having the internal crown shape or internal inverted crown shape is a nip roller. By covering the roller 1 with rubber having an internal crown shape or an internal inverted crown shape, the deflection of the roller 1 changes as the state in which the axis of the roller 1 is supported and the state in which it is not supported, the location of support for the roller axis, and the support rigidity change, and it is expected that the change in surface pressure distribution will be suppressed as a result.

[0068] The structure of the roller 1 is not particularly limited, but a single-axis structure having a solid cylindrical core or a hollow cylindrical core, or a double-tube structure having a hollow cylindrical outer cylinder member and a central axis arranged coaxially with the outer cylinder member, wherein the outer cylinder member and the central axis are connected at the longitudinal center of the outer cylinder member can be used as appropriate.

[0069] In particular, when the present invention is applied to a web conveying device that conveys a web while gripping it with two rollers, it is preferable to have a double-tube structure, and furthermore, it is preferable that the roller 1 in the double-tube structure is a nip roller. By having a double-tube structure, the deflection of the roller 1 changes depending on whether the axis of the roller 1 is supported or not, the location of support for the axis of the roller 1, and the change in support rigidity, and it is expected that this will suppress changes in the surface pressure distribution. Here, the core metal of the roller may be made by integral molding, or it may be a so-called connecting structure in which multiple core metals are connected.

[0070] The roller 1 may be connected to a rotational drive means (not shown) and rotated. The rotational drive means can be a general-purpose motor such as an AC motor or a DC motor, and a speed control mechanism may be provided as needed. [Examples]

[0071] The present invention will be described in detail below with reference to examples, but the present invention is not limited in any way by these examples.

[0072] [Example 1] In the corona treatment process of the plastic film manufacturing line shown in Figure 15, a polypropylene film with an average thickness of 5 μm and a width of 6000 mm was clamped and conveyed between a nip roller 50 and an electrode roller 51. The gripping angle of the electrode roller 51 was 180 degrees, the conveying speed was 200 m / min, and the surface pressure was 400 N / m. The nip roller 50 is a single-axis structure made of a carbon steel core, with a diameter of φ330 mm and a face length of 7000 mm. The nip roller 50 also has ethylene propylene rubber 52 with a hardness of 50 Hs JIS A (JIS K 6301-1995) on its surface. The electrode roller 51 has a diameter of φ400 mm and a face length of 7000 mm. The axes on both sides of the nip roller 50 were supported by a first support part 30 and a second support part 31 having a separation support mechanism 32, as shown in Figure 2. As the first support section 30, an operable swivel arm 4 was installed on the shaft 200 mm from the long end of the nip roller 50, with one arm on each side. The second support section 31 was installed on each side of the shaft, with the connection point to the shaft being 100 mm from the first support section 30 toward the end of the shaft. A double-acting air cylinder 3 was used for the separation support mechanism 32, with a thrust of 100 N. The conditions for supporting the nip roller 50 were as follows. Condition 1: The shaft was supported only by the first support parts 30 on both sides. Condition 2: In addition to the first support part 30, the shaft was supported by second support parts 31 on both sides of the shaft.

[0073] [Example 2] The shafts on both sides of the nip roller 50 were supported by a first support part 30 and a second support part 31 having a movable support mechanism 33, as shown in Figure 5. The second support part 31 was installed at one location on each side of the shaft, and the connection position to the shaft was movable within a range of 100 to 300 mm in the direction from the first support part 30 toward the end of the shaft. A ball screw was used for the movable support mechanism 33. Other conditions were the same as in Example 1. The conditions for supporting the nip roller 50 were as follows. Condition 1: In addition to the first support part 30, the shaft was supported by second support parts 31 on both sides of the shaft at a position 100 mm away from the first support part 30 in the direction toward the end of the shaft. Condition 2: The same conditions as Condition 1 were met except that the position of support by the second support part 31 was changed to a position 300 mm away from the first support part 30 in the direction toward the end of the shaft.

[0074] [Example 3] The shafts on both sides of the nip roller 50 were supported by a first support part 30 and a second support part 31 having a rigidity adjustment mechanism 34, as shown in Figure 8. The second support part 31 was installed at one location on each side of the shaft, and the connection position to the shaft was 100 mm from the first support part 30 toward the end of the shaft. Silicone rubber was used for the elastic member 6 of the rigidity adjustment mechanism 34, and the deformation amount of the silicone rubber was adjustable by 5 mm using a bolt 7. Other conditions were the same as in Example 1. The conditions for supporting the nip roller 50 were as follows. Condition 1: In addition to the first support part 30, the second support parts 31 on both sides of the shaft provided support at a position 100 mm away from the first support part 30 in the direction toward the end of the shaft. The deformation amount of the silicone rubber of the rigidity adjustment mechanism 34 was set to 5 mm. Condition 2: The same as Condition 1 except that the deformation amount of the silicone rubber in the rigidity adjustment mechanism 34 was changed to 1 mm.

[0075] [Example 4] The shafts on both sides of the nip roller 50 were supported by a first support part 30 as shown in Figure 9 and a second support part 31 having a composite mechanism combining a separation support mechanism 32 and a movable support mechanism 33. The second support part 31 was installed at one location on each side of the shaft, and the connection position to the shaft was made movable within a range of 100 to 300 mm in the direction from the first support part 30 toward the end of the shaft using the movable support mechanism 33. A double-acting air cylinder 3 was used for the separation support mechanism 32 and the movable support mechanism 33, with a thrust of 100 N. Other conditions were the same as in Example 1. The conditions for supporting the nip roller 50 were as follows. Condition 1: The shaft was supported only by the first support parts 30 on both sides. Condition 2: In addition to the first support part 30, the shaft was supported by second support parts 31 on both sides of the shaft at a position 100 mm away from the first support part 30 in the direction toward the end of the shaft. Condition 3: The same as Condition 2 except that the position of support by the second support part 31 was changed to a position 300 mm away from the first support part 30 in the direction toward the end of the shaft.

[0076] [Example 5] The shafts on both sides of the nip roller 50 were supported by a first support part 30 as shown in Figure 10 and a second support part 31 having a composite mechanism combining a movable support mechanism 33 and a rigidity adjustment mechanism 34. The second support part 31 was installed at one location on each side of the shaft, and the connection position to the shaft was made movable within a range of 100 to 300 mm in the direction from the first support part 30 toward the end of the shaft using the movable support mechanism 33. A ball screw was used for the movable support mechanism 33. For the rigidity adjustment mechanism 34, a steel material member and an aluminum material member of the same shape were used as replaceable members 9. Other conditions were the same as in Example 1. The conditions for supporting the nip roller 50 were as follows. Condition 1: In addition to the first support part 30, the shaft was supported by second support parts 31 on both sides of the shaft at a position 100 mm away from the first support part 30 in the direction toward the end of the shaft. A steel material was used for the rigidity adjustment mechanism 34. Condition 2: The same conditions as Condition 1 were met except that the position of support by the second support part 31 was changed to a position 300 mm away from the first support part 30 in the direction toward the end of the shaft. Condition 3: The same conditions as Condition 2 were followed, except that aluminum material was used for the rigidity adjustment mechanism 34.

[0077] [Example 6] The shafts on both sides of the nip roller 50 were supported by a first support part 30 as shown in Figure 11 and a second support part 31 having a composite mechanism combining a separation support mechanism 32 and a rigidity adjustment mechanism 34. The second support part 31 was installed at one location on each side of the shaft, and the connection position to the shaft was 100 mm from the first support part 30 in the direction toward the end of the shaft. A double-acting air cylinder 3 was used for the separation support mechanism 32. Silicone rubber was used for the elastic member 6 of the rigidity adjustment mechanism 34, and the deformation amount of the silicone rubber was made adjustable by 5 mm using the air cylinder 3. Other conditions were the same as in Example 1. The conditions for supporting the nip roller 50 were as follows. Condition 1: The shaft was supported only by the first support parts 30 on both sides. Condition 2: In addition to the first support part 30, the second support parts 31 on both sides of the shaft provided support at a position 100 mm away from the first support part 30 in the direction toward the end of the shaft. The thrust of the air cylinder 3 was set to 100 N, and the deformation amount of the silicone rubber of the rigidity adjustment mechanism 34 was set to 5 mm. Condition 3: The thrust of the air cylinder 3 was set to 80N, and the deformation amount of the silicone rubber of the rigidity adjustment mechanism 34 was changed to 1mm, otherwise it was the same as Condition 2.

[0078] [Example 7] The shafts on both sides of the nip roller 50 were supported by a first support part 30 in the configuration shown in Figure 14 and a second support part 31 having a composite mechanism combining a separation support mechanism 32, a movable support mechanism 33, and a rigidity adjustment mechanism 34. The second support part 31 was installed at one location on each side of the shaft, and the connection position with the shaft was movable within a range of 100 to 300 mm in the direction from the first support part 30 toward the end of the shaft. Silicone rubber was used as the elastic material 6 for the shaft-bearing connecting member 22 and the bearing-arm connecting member 23, and the deformation amount of the silicone rubber was adjustable by 5 mm using bolts 7. Other conditions were the same as in Example 1. The conditions for supporting the nip roller 50 were as follows. Condition 1: The shaft was supported only by the first support parts 30 on both sides. Condition 2: In addition to the first support part 31, the second support parts 31 on both sides of the shaft provided support at a position 100 mm away from the first support part 30 in the direction toward the end of the shaft. The deformation amount of the silicone rubber of the rigidity adjustment mechanism 34 was set to 5 mm. Condition 3: The position of support by the second support part 31 was changed to a position 300 mm away from the first support part 30 in the direction toward the end of the shaft, otherwise it was the same as Condition 1. Condition 4: The same as Condition 2 except that the deformation amount of the silicone rubber in the rigidity adjustment mechanism 34 was changed to 1 mm.

[0079] [Example 8] The configuration was the same as in Example 7, except that the nip roller 50 used a double-tube structure roller. The nip roller 50 has an outer cylinder member made of carbon fiber composite material and a central shaft made of carbon steel, with the outer cylinder member and central shaft connected at the center in the longitudinal direction. The diameter of the nip roller 50 is φ330 mm and the face length is 7000 mm. The nip roller 50 has ethylene propylene rubber with a hardness of 50 Hs JIS A (JIS K 6301-1995) on its surface. The conditions for supporting the nip roller 50 were also the same as in Example 7.

[0080] [Example 9] The structure of the nip roller 50 was the same as in Example 7, except that it used a roller with an internal crown structure. The nip roller 50 is a single-axis structure made of a carbon steel core, with a diameter of φ330 mm and a face length of 7000 mm. The nip roller 50 also has two layers of rubber, with an ethylene propylene rubber with a hardness of 80 Hs JIS A (JIS K 6301-1995) on the surface and an ethylene propylene rubber with a hardness of 50 Hs JIS A (JIS K 6301-1995) on the bottom. The ethylene propylene rubber of the bottom layer is wound so that its thickness gradually decreases by 1.5 mm in diameter from the center to both ends. The conditions for supporting the nip roller 50 were also the same as in Example 7.

[0081] [Comparative Example 1] The shafts on both sides of the nip roller 50 were supported only by the first support part 30. The structure and support position of the first support part 30 were the same as in Example 1. Other conditions were also the same as in Example 1. The conditions for supporting the nip roller 50 were as follows. Condition 1: The nip roller 50 was supported only by the first support parts 30 on both sides of the shaft. Condition 2: The surface pressure was increased to 600 N / m.

[0082] The calculation and measurement methods for each example and Comparative Example 1 are shown below.

[0083] [Method for calculating natural frequencies] The natural frequencies of a corona treatment device consisting of a nip roller 50 and an electrode roller 51 were calculated using finite element analysis.

[0084] [Method for measuring roller vibration] Using a Keyence LK-500 laser displacement meter, the runout at the longitudinal center of the roller was measured, and the difference between the maximum and minimum values ​​was defined as the amplitude.

[0085] [Method for measuring uniform nip properties] First, the pressure distribution between the nip roller 50 and the electrode roller 51 was measured using Nitta Corporation's I-SCAN surface pressure distribution measurement system. Measurements were taken at a total of 5 points, including the center, at 1.5m intervals from the center outwards from both ends, using the center in the longitudinal direction as the reference point. The measurement width at each point was 56mm. From each measurement point, the value at the center of the nip width was extracted in the longitudinal direction, and the minimum value among the extracted values ​​was divided by the maximum value and multiplied by 100 to determine the uniform nipness. A higher value indicates a more uniform surface pressure distribution.

[0086] The results for each example and Comparative Example 1 are shown in Table 1. The "〇" symbol in Table 1 indicates the support mechanism and roller structure used in each example.

[0087] [Table 1]

[0088] In Example 1, under condition 1, the vibration in the center of the roller was large at 200 μm, indicating that resonance was occurring. At that time, the natural frequency of the corona treatment device was 60 Hz. Therefore, the separation support mechanism 32 was activated, and the condition was changed to condition 2 to avoid resonance using the separation support method. As a result, the natural frequency of the corona treatment device was significantly increased to 110 Hz, and by avoiding resonance, the vibration was reduced to 70 μm. On the other hand, the change in support conditions altered the surface pressure distribution, and the uniform nip performance decreased from 95% to 70%.

[0089] Even under condition 1 of Example 2, the vibration in the center of the roller was large at 150 μm, indicating that resonance was occurring. At that time, the natural frequency of the corona treatment device was 120 Hz. Therefore, the movable support mechanism 33 was activated, and the condition was changed to condition 2 to perform a resonance avoidance operation using the movable support method. As a result, the natural frequency of the corona treatment device was reduced to 110 Hz, and by avoiding resonance, the vibration was reduced to 70 μm.

[0090] In Example 3, under condition 1, the vibration in the center of the roller was low at 70 μm, avoiding resonance. However, by activating the rigidity adjustment mechanism 34 and changing to condition 2, the vibration could be further reduced to 40 μm by performing resonance avoidance operations using the rigidity adjustment method.

[0091] In Example 4, under condition 1, similar to condition 1 in Example 1, the vibration in the center of the roller was large at 200 μm, indicating that resonance was occurring. At that time, the natural frequency of the corona treatment device was 60 Hz. Therefore, the separation support mechanism 32 was activated, and the condition was changed to condition 2 to perform a resonance avoidance operation using the separation support method. As a result, the natural frequency of the corona treatment device increased significantly to 110 Hz, and by avoiding resonance, the vibration was reduced to 70 μm. Subsequently, to further suppress the vibration, the moving support mechanism 33 was activated, and the condition was changed to condition 3 to perform a resonance avoidance operation using the moving support method. As a result, by fine-tuning the natural frequency of the corona treatment device to 100 Hz, the vibration was reduced to 40 μm.

[0092] In Example 5, under condition 1, similar to condition 1 in Example 2, the vibration in the center of the roller was large at 150 μm, indicating that resonance was occurring. At that time, the natural frequency of the corona treatment device was 120 Hz. Therefore, the movable support mechanism 33 was activated, and the condition was changed to condition 2 to perform a resonance avoidance operation using the movable support method. As a result, the natural frequency of the corona treatment device decreased to 110 Hz, and the vibration was reduced to 70 μm by avoiding resonance. Subsequently, in order to further suppress the vibration, the rigidity adjustment mechanism 34 was activated, and the condition was changed to condition 3 to perform a resonance avoidance operation using the rigidity adjustment method. As a result, by fine-tuning the natural frequency of the corona treatment device to 100 Hz, the vibration was reduced to 40 μm.

[0093] In Example 6, under condition 1, similar to condition 1 in Example 1, the vibration in the center of the roller was large at 200 μm, indicating that resonance was occurring. At that time, the natural frequency of the corona treatment device was 60 Hz. Therefore, the separation support mechanism 32 was activated, and the condition was changed to condition 2 to perform a resonance avoidance operation using the separation support method. As a result, the natural frequency of the corona treatment device increased significantly to 110 Hz, and by avoiding resonance, the vibration was reduced to 70 μm. Subsequently, in order to further suppress the vibration, the rigidity adjustment mechanism 34 was activated, and the condition was changed to condition 3 to perform a resonance avoidance operation using the rigidity adjustment method. As a result, by fine-tuning the natural frequency of the corona treatment device to 100 Hz, the vibration was reduced to 40 μm.

[0094] In Example 7, under condition 1, similar to condition 1 in Example 1, the vibration in the center of the roller was large at 200 μm, indicating that resonance was occurring. At that time, the natural frequency of the corona treatment device was 60 Hz. Therefore, the separation support mechanism 32 was activated, and the condition was changed to condition 2, performing a resonance avoidance operation using the separation support method. As a result, the natural frequency of the corona treatment device increased significantly to 110 Hz, and by avoiding resonance, the vibration decreased to 70 μm. Subsequently, to further suppress vibration, the movement support mechanism 33 was activated, and the condition was changed to condition 3, performing a resonance avoidance operation using the movement support method. As a result, by fine-tuning the natural frequency of the corona treatment device to 100 Hz, the vibration decreased to 40 μm. Subsequently, to further suppress vibration, the rigidity adjustment mechanism 34 was activated, and the condition was changed to condition 4, performing a resonance avoidance operation using the rigidity adjustment method. As a result, by fine-tuning the natural frequency of the corona treatment device to 90 Hz, the vibration decreased to 20 μm.

[0095] In Examples 8 and 9, similar to Example 7, vibration was reduced to 20 μm by changing the support conditions from 1 to 4. In this case, by using a double-tube nip roller 50 or an internal crown nip roller 50, the change in uniform nipness due to the change in support was small, and in both cases it was 90% or more.

[0096] In Comparative Example 1, under Condition 1, similar to Condition 1 in Example 1, the vibration in the center of the roller was large at 200 μm, indicating that resonance was occurring. At that time, the natural frequency of the corona treatment device was 60 Hz. Therefore, the surface pressure was changed from 400 N / m to 600 N / m. As a result, although the natural frequency of the corona treatment device increased to 65 Hz, the vibration remained at 150 μm, which was not enough to avoid resonance. Furthermore, the significant increase in surface pressure worsened the surface pressure distribution, and the uniform nip performance decreased to 50%.

[0097] Thus, according to the present invention, by supporting a roller using a roller support mechanism having a mechanism that can change between supporting and not supporting the shaft, a mechanism that can change the support point in the longitudinal direction of the shaft, or a mechanism that can change the rigidity of the support part, it becomes possible to significantly change the natural frequency of the web conveying device while also making fine adjustments, thereby avoiding resonance. Furthermore, by applying the roller support method of the present invention to a web conveying device having a roller having at least one of a double-tube core, an internal crown structure rubber coating, or an internal inverted crown structure rubber coating, it becomes possible to control the natural frequency while suppressing changes in the surface pressure distribution. [Industrial applicability]

[0098] The present invention can be applied not only to nip rollers in film-making apparatuses, but also to press rollers in paper-making apparatuses, rolling rollers in steel-making apparatuses, and the like; however, its scope of application is not limited to these. [Explanation of symbols]

[0099] 1: Roller 2: Bearings 3: Cylinder 4: Arm 5: Axis (separable) 6: Elastic material 7: Bolt 8: Movement mechanism 9: Replaceable parts 10: Accelerometer 20: Shaft-to-shaft connecting member 21: Connecting member between arms 22: Shaft and bearing connecting member 23: Connecting member between bearing and arm 30: First support 31: Second support 32: Separation support mechanism 33: Moving support mechanism 34: Rigidity adjustment mechanism 40: First support position 41: Second support position 50: Nipple Roller 51: Electrode Roller 52: Rubber 53: Mandrel 54: Film 55: Power supply 56: Corona-treated electrode Da: Direction of movement of the separation support mechanism Db: Direction of movement of the movable support mechanism R1: Range where the axis is not supported by the second support point. R2: Range of support for the shaft at the second support point.

Claims

1. A method of supporting one side of the axis of a roller at a first support position and at least one second support position in a direction toward the end of the axis from the first support position, When it is confirmed that the roller is resonating, the second support position is changed from supporting the shaft to not supporting it, or from not supporting the shaft to supporting it. A method for supporting rollers.

2. A method of supporting one side of the axis of a roller at a first support position and at least one second support position in a direction toward the end of the axis from the first support position, When it is confirmed that the roller is resonating, the second support position is changed in the longitudinal direction of the shaft, or the rigidity of the support part supporting the second support position is changed. A method for supporting rollers.

3. A mechanism that supports the axle on one side of the roller, A first support portion that supports the shaft, At a location further toward the end of the shaft than the first support portion, there is at least one second support portion that can change between supporting the shaft and not supporting it, A roller support mechanism equipped with [a specific feature].

4. A mechanism that supports the axle on one side of the roller, A first support portion that supports the shaft, The system includes at least one second support portion that supports the shaft at a location in a direction toward the end of the shaft from the first support portion, The second support portion can change the location at which it supports the shaft in the longitudinal direction, or the rigidity of the second support portion can be changed. A roller support mechanism.

5. The roller support mechanism according to claim 4, wherein the second support portion has an elastic member that presses against and supports the shaft.

6. A roller having at least one of a double-tube core, an internal crown structure rubber coating, or an internal inverted crown structure rubber coating, The system comprises a support mechanism for two rollers, each supporting one side of the axis of the aforementioned roller, A web conveying device wherein at least one of the two roller support mechanisms is a roller support mechanism according to any one of claims 3 to 5.

7. The web conveying device according to claim 6, wherein the roller is a nip roller.

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