JP2712102B2 - Light rotating roll - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a light-rotating roll suitable for conveying light-weight materials such as resin films, metal sheets, and paper.

[Conventional technology]

Many rotatable rolls are used in the conveying path of light and thin materials. As a conventional rotatable roll, bosses 2a are provided at both ends of a cylindrical roll body 1 as shown in FIG.
A shaft 2 having a shaft 2 is fixed and the shaft 2 is rotatably held by a bearing 3, or a cylindrical roll body 4 is rotatably held by a shaft 6 via a bearing 5 as shown in FIG. Are used.

These rotatable rolls are required to be lightly rotatable in order to avoid slips, cuts, wrinkles, etc. due to the unsynchronized speed between the rolls and the conveyed object, or to reduce the tension applied to the conveyed object. ing. It is desirable to reduce the moment of inertia of the roll in order to secure the light rotation of the roll. For this purpose, it is effective to reduce the diameter of the roll and to reduce the thickness of the roll. However, since bending of the roll also hinders conveyance and the like, it is necessary to increase the bending rigidity, and there is a limit to reducing the diameter and thickness of the roll.

To reduce the moment of inertia while maintaining the required bending stiffness, materials with a large specific elastic modulus E / ρ, such as carbon fiber reinforced resin, have begun to be used. In addition, there has been a problem that the weight ratio of the moment of inertia of the bearings, bosses, and the like has increased with the reduction in the weight of the roll body, and it has been difficult to achieve a significant weight reduction.

[Problems to be solved by the invention]

The present invention is intended to solve such a conventional problem.
An object of the present invention is to provide a lightly rotatable roll having a small moment of inertia while having a bending rigidity that does not hinder the conveyance of light and thin materials.

[Means for solving the problem]

The present inventors have conducted intensive studies to achieve the above object,
The roll is divided into a shaft having the required rigidity and a shell rotatable with respect to the shaft, and the shell is held by the shaft with a small gap over substantially the entire length thereof. By adopting the structure, the shell itself does not need to have bending rigidity, and not only can the shell be made thinner and lighter, but also a lighter resin material can be used, and light rotation is obtained. The inventors have found that the present invention can be performed, and have achieved the present invention.

That is, the present invention relates to a cylindrical shell having a cylindrical inner surface, which is rotatably mounted on the cylindrical support surface of a shaft having a cylindrical support surface having substantially the same length as the cylindrical shell on the outer periphery. In the roll to be fitted, the shaft body is formed into a shape and dimensions having a bending rigidity required for the roll by using a high elastic modulus material, and the shell body is made thin by using a resin material. A light-rotating roll is characterized in that the roll is formed so that the load acting on the shell is supported by the shaft with the gap between the shell and the shaft being 10 to 100 μm.

 Hereinafter, the present invention will be described in more detail with reference to the drawings.

In FIG. 1, a lightly rotatable roll 10 of the present invention basically comprises a shaft 11 and a thin cylindrical shell 12 rotatably held by the shaft 11, and the shaft 11 is On the outer periphery, a cylindrical support surface 11a having substantially the same length as the cylindrical shell is provided.
2 has a cylindrical inner surface 12a slightly larger in diameter than the support surface 11a on its inner surface, and the shell 12 is rotatably fitted to the support surface 11a with a small gap. Reference numeral 13 denotes a fixing ring that prevents the axial movement of the shell 12, and reference numeral 14 denotes a support that supports the shaft 11. The support 14 may support the shaft 11 non-rotatably or rotatably.

The role of the shaft 11 in the present invention is to secure bending resistance, and the shape and structure are arbitrary as long as it has the required bending rigidity and has a cylindrical support surface for supporting the shell 12. is there. In FIG. 1, a hollow cylindrical material is shown as the shaft body 11, but a solid cylindrical material may be used instead. Further, a roll body having shafts 2 attached to both ends shown in FIG. It is also possible to use the roll body 4 shown in FIG. 1 or FIG. 6 as the shaft body of the present invention. FIG. 2 shows an example in which a shaft having a shape similar to that of the conventional roll shown in FIG. 5 is used, and reference numeral 10A indicates the entire light-rotating roll. The lightly rotating roll 10A has a shaft body 15 having a cylindrical support surface 15a.
A and a shaft 15 composed of shafts 15B
The shell 12 is rotatably held on the cylindrical support surface 15a with a small gap. The shaft 15B is rotatably held on a support 17 via a bearing 16. In the light-rotating roll of the present invention, since the shaft itself may not be able to rotate with respect to the support, the shaft 15B of the shaft 15
May be fixed so that it cannot rotate.

The shaft body according to the present invention plays a role in securing the bending resistance as described above. The product of elastic modulus and second moment of area, EI, contributes to the bending resistance of long materials. Therefore, a metal cylindrical material or a thick cylindrical material is suitable for the shaft. In order to further improve the bending resistance, it is preferable to use a molded article of a fiber reinforced resin having a large specific elastic modulus such as a carbon fiber reinforced resin. Therefore, the shaft 11 in FIG. 1 and the light body in FIG. 15A is preferably made of a fiber-reinforced resin molded product.

The shaft body 11 and the shaft body 15A can be manufactured by molding a fiber-reinforced resin by a so-called prepreg method, a filament winding method, or a lay-up, injection molding, or extrusion molding of a short fiber-reinforced resin. In this case, a core mold may be used, but a metal cylinder or a cylindrical material having an appropriate thickness may be used as the core mold, and may be used as it is after being wound after winding the carbon fiber reinforced resin. .

The cylindrical support surfaces 11a and 15a on the outer periphery of the shaft support the shell 12 over substantially the entire length thereof. For accurate fitting with the shell, turning, grinding, etc. Refinement by Note that the support surfaces 11a and 15a do not necessarily have to be continuous in the axial direction, and may be discontinuous within a range that does not hinder the bending of the shell. It is desirable that this support surface has a low coefficient of friction with the shell. If the shaft is made of a material with a high coefficient of friction, the surface should be coated with a low friction material and the low friction material surface should be used as the support surface. it can.

Next, the shell 12 to be fitted to the shaft body is made of a resin using a resin material at least partially, and is provided between the outer peripheral surface for conveying the conveyed object and the cylindrical support surface on the outer surface of the shaft body. And a cylindrical inner surface having a shape and dimensions in which a minute gap is accurately secured. Since the shell is supported by the cylindrical support surface of the shaft over substantially the entire length, the bending rigidity required for the roll body 4 supported by bearings at both ends as shown in FIG. There is no need for this, and it can be made thin with low bending rigidity. The inner surface fitted to the shaft body can also be formed by forming at least the inner peripheral surface of the shell body from a metal and refining the inner surface by cutting, grinding, or the like. However, when the shell becomes small and long, it is difficult to cut and grind the inside diameter. Therefore, it is preferable that at least the inner peripheral portion of the shell is formed of a molded product formed by using a core having a cylindrical outer surface. Since the inner surface of such a molded product becomes a transfer molding surface of the outer surface of the core mold, by maintaining the outer surface of the core mold with a predetermined dimensional accuracy and smoothness, the inner surface of the molded product remains in the molded state and has a predetermined size. It has accuracy, smoothness, etc.
A minute gap can be accurately secured between the shaft and the cylindrical support surface. If necessary, a light finish such as polishing or honing may be applied to the inner surface of the molded product.

Examples of shells formed by using a core mold include resin moldings formed by injection molding, extrusion molding, casting, etc., prepreg method, filament winding method, lay-up method, injection molding, extrusion molding, etc. Fiber-reinforced resin molded products can be mentioned. In addition, a laminated winding of these resin molded products and a metal foil formed by attaching a resin adhesive to a metal foil such as a stainless steel foil and winding it around a core mold. Also, there can be mentioned a layered combination with a metal spray mold formed by spraying a self-fluxing alloy powder of nickel or cobalt, etc. onto a product or a core mold, and then removing the core mold. When a large rigidity is desired to be given to the shell, carbon fiber reinforced resin, stainless steel foil and the like are suitable winding materials, and the metal sprayed layer is similar to this.

The appropriate value of the gap between the shaft and the shell varies depending on the use conditions of the roll, etc., but in most cases, it is in the range of 10 to 100μ.
In order to secure such a shape and dimensions, the core after shaping the outer surface may be used as the core mold to be used for molding the shell. Good.

As described above, the light-rotating roll of the present invention has a shell rotatably fitted to the cylindrical outer peripheral surface of the shaft at a small interval, and this shell is attached to the shaft. It is desirable to rotate lightly. Therefore, various known lubrication means are applied between the shaft body and the shell body according to the use conditions of the roll.
For example, the cylindrical support surface of the shaft body and the inner surface of the shell are made of materials having a small friction coefficient with each other. Fluororesin, ultra-high molecular weight polyethylene, chrome plating, fluororesin composite chromium plating, etc., have a small coefficient of friction with hard materials such as metal materials and have little mutual wear. Therefore, it is preferable that one of the fitting surfaces of the shaft body and the shell body is a hard body such as a metal material, and the other is covered with these materials by bonding or plating. It is also useful to use the ultrahigh molecular weight polyethylene itself as a shell depending on the application.

In addition, if a plurality of grooves, a large number of small holes, and fine irregularities such as pears are provided on the cylindrical support surface on the outer surface of the shaft and / or the inner surface of the shell, the stratification of air on the mating surface is improved, and friction and Wear is reduced.

In order to obtain better lubrication, a fluid such as liquid or air is fed between the shaft and the shell, or ultrasonic vibration is applied to the shaft and / or the shell, or between the shaft and the shell. It is better to prevent contact between the shaft and the shell by repelling the magnetic force. The introduction of fluid is also effective for cooling the friction surface. The cooling may be performed by feeding a fluid into the shaft.

Depending on the place where the light rotating roll is used, if the shell rotates too lightly, the inertial rotation becomes large when the conveyed object is decelerated, which may cause inconvenience. In such a case,
An appropriate frictional force acts between the shaft and the shell,
Friction between the shaft and the shell can also be used as an element to suppress the inertial rotation of the shell.

The outer peripheral surface of the shell 12 can be a surface having characteristics according to the place of use, for example, a smooth surface, a chrome-plated surface, a rubber surface, or the like.

The light-rotating roll of the present invention is effective not only when it is used as a rotatable roll to follow a conveyed object, but also when it is used as a driving roll. When the roll of the present invention is used as a drive roll,
In order to make the most of the light rotation, the rotor mechanism of the motor is attached to the roll shell, and the shell is directly rotated by the stator placed close to or in contact with the shell, so that the drive system inertia coefficient is added. It is better to avoid. Various types of electromagnetic motors, electrostatic motors, ultrasonic motors and the like can be used for this, but the induction motor is most easily used. FIG. 3 shows an example in which the roll of the present invention is configured as an induction motor. A thin cylindrical shell 12 is rotatably held on a cylindrical support surface on the outer periphery of a shaft 11 with a small gap. ing. Reference numeral 13 denotes a ring for preventing the shell 12 from moving in the axial direction. The shell 12 has at least the ends shown in FIG. 4 which are made of a conductive material or have conductivity by pasting a conductive foil, and a plurality of punches 20 are formed in the conductive portion. It is a cage type and the stator 21 of the induction motor is arranged around these. With this configuration, the basket-type shell 12 can be driven to rotate by energizing the stator 21. The roll system can be downsized by incorporating the stator inside the shaft. Further, if a frequency variable inverter is used as a power supply, the speed change can be performed in a very short time in combination with the light weight of the roll of the present invention.

[Operation] The outer diameter of the body of the roll shown in FIG.
Assuming that D ₁ , wall thickness is t [= (D−D ₁ ) / 2], length is 1, the moment of inertia of area is I, the elastic modulus of the material is E, and the density is ρ, the bending stiffness related to deflection is , t / D is small, In addition, the moment of inertia related to light rotation is Therefore, the merits of combining the two are: Becomes In other words, the only factor that improved the overall merit was the specific elastic modulus, and D and t were merely design elements related to the performance distribution to bending resistance and light rotation. This often resulted in compromising either performance.

On the other hand, the bending stiffness of the roll of the present invention is assuming that the stiffness is determined only by the shaft body and that the shaft body is a cylindrical material having an outer diameter D ₂ and an inner diameter d. The moment of inertia of the shell rotating around the shaft is Therefore, the total merit of both is Becomes In the above equation, E is for the shaft body, ρ and t
Is for the shell. In other words, in the roll of the present invention, the independent factors related to the overall merit are E and d / D _{2 for} the shaft body and ρ and D / t for the shell body. This makes it possible to achieve sufficient light rotation.

In other words, in order to improve the bending resistance, use of a high elastic modulus material for the shaft (and further application of a high specific modulus material intended to reduce the deflection of the shaft due to its own weight) and reduction of d / D ₂ (Solidification or thickening) is effective.

In addition, in order to improve light rotation, the application of low-density materials to the shell (and the application of low-density, high-modulus materials to enhance the flatness of the shell) and the reduction of t / D ( Thinning) is effective. In the roll of the present invention, unlike the conventional roll, measures for improving the bending resistance do not impair the light rotation property.

As shown in FIG. 2, in the conventional free roll using a normal roll as the shaft of the roll of the present invention, the shaft that co-rotates with the shell during steady-state conveyance is a problem. In the case of the rapid shift, the shell follows the rapid shift, thereby preventing the inertia of the shaft roll from causing the out-of-sync.

〔Example〕

As the present invention, a light-rotating roll having the shape shown in FIG. 1 was made according to the following specifications, and as Comparative Examples I and II, a roll having the shape shown in FIG. 6 was made according to the following specifications.

Next, a total of 10 kg of load was applied to each of the rolls in a distributed manner at 10 locations, and the amount of deflection displacement of each portion was measured. About 60% of the rolls.

The moment of inertia of the roll is the same as that of the roll of the present invention.
34 kg-cm ² , the roll of Comparative Example I was 68 kg-cm ² , the roll of Comparative Example II was 119 kg-cm ² , and the ratio of the moment of inertia to the roll of Comparative Example II was only 70% in Comparative Example I. On the other hand, in the case of the roll of the present invention, the reduction could be reduced to 25%.

As is evident from this, the roll of the present invention has the same flexural rigidity as the roll of Comparative Example I, while reducing the moment of inertia and achieving low rotation.
In spite of the large flexural rigidity of the roll of Comparative Example II, the moment of inertia can be far reduced and the rotation speed is reduced.

〔The invention's effect〕

As explained above, the light-rotating roll of the present invention
A thin cylindrical shell made of resin is rotatably fitted on the cylindrical support surface of the high-rigidity shaft with a gap of 10 to 100μ, so the bending of the shell is suppressed by the shaft. As a result, the shell does not need to have a large bending rigidity, so that the shell can be made thinner, and it has been possible to greatly improve both bending resistance and light rotation, which were difficult in the past. This improves the situation in which any of the performances has conventionally been compromised, and has the effect of eliminating various obstacles in the transport of light and thin materials.

The thin-walled cylindrical shell of the light-rotating roll of the present invention is:
By forming at least the inner peripheral portion in contact with the shaft body into a molded product manufactured by molding using a core mold, the cylindrical inner peripheral surface fitted to the outer peripheral support surface of the shaft body can be easily formed. ， Cost of shell production can be reduced.

Furthermore, by providing a rotor mechanism for the motor to the shell of the light-rotating roll of the present invention, and arranging the stator of the motor on the inner or outer periphery thereof, the shell itself can be directly driven and the speed response can be improved. A good driving roll can be obtained.

[Brief description of the drawings]

1 is a schematic sectional view showing one embodiment of the present invention, FIG. 2 is a schematic sectional view showing another embodiment, and FIG. 3 is a schematic sectional view showing an example in which an induction motor is incorporated in a roll of the present invention. , FIG. 4 is a plan view showing an end of a shell used for the roll, and FIG.
FIG. 6 is a schematic sectional view showing a conventional rotatable roll. 10,10A… Lightly rotating roll, 11… Shaft, 11a… Cylindrical support surface, 12… Shell, 12a …… Cylindrical inner surface, 13 …… Ring, 1
4 ... Support, 15 ... Shaft, 15A ... Shaft body, 15B ... Shaft, 1
5a: cylindrical support surface, 20: punching, 21: stator.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-153044 (JP, A) JP-A-49-72544 (JP, A) Japanese Utility Model 1987-55568 (JP, U) Japanese Utility Model 96461 (JP, U) Jiko 39-22252 (JP, Y1)

Claims (5)

(57) [Claims] 1. A cylindrical shell having a cylindrical inner surface is rotatably fitted to a cylindrical support surface of a shaft having a cylindrical support surface on the outer periphery having substantially the same length as the cylindrical shell. In the roll to be combined, the shaft body is formed into a shape and dimensions having a required bending rigidity by using a high elastic modulus material, and the shell body is formed into a thin shape using a resin material. And
A light-rotating roll, wherein a gap between the shell and the shaft is set to 10 to 100 μ to support the load acting on the shell by the shaft. 2. A lightly rotatable roll according to claim 1, wherein at least the inner peripheral portion of said shell is a molded product formed by using a core having a cylindrical outer surface. . 3. The shell according to claim 1, wherein a rotor mechanism of a motor is attached to said shell, and a stator is arranged inside or outside of said shell to directly drive said shell. 3. The light-rotating roll according to item 2. 4. The apparatus according to claim 1, wherein fluid is supplied between said shell and said shaft.
Item 4. The lightly rotatable roll according to item 2 or 3. 5. A light-rotating roll according to claim 1, wherein ultrasonic vibration is applied to at least one of said shell and said shaft.