JPH0967053A - Sheet body conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To intensify adhesion between the sheet bodies traveling along the peripheral surface of a suction roll, positively correct the dislocation of a travel position and prevent the generation of a transfer mark. SOLUTION: In a sheet body conveying device provided whit a suction roll 2 for supporting a traveling sheet body (magnetic tape raw cloth) on the peripheral surface, the suction roll 2 has a mesh cylinder 13 with a large number of suction holes 14 of 1mm or less in diameter opened on the surface of a cylindrical metallic roll part by etching, on the outermost periphery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet body conveying apparatus suitable for conveying a sheet body such as a magnetic recording medium being conveyed in a process of manufacturing a magnetic recording medium such as a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, as a magnetic tape for recording information signals such as data signals and video signals, powder of oxide magnetic powder, alloy magnetic powder, etc. on a non-magnetic support made of polyester, polyethylene terephthalate (PET) or the like. A so-called coating type magnetic tape in which a magnetic coating is formed by coating and drying a magnetic coating material in which a magnetic material is dispersed in a binder made of an organic polymer material is widely used.

In the production of this coating type magnetic tape, a magnetic coating is applied to a sheet-shaped non-magnetic support to form a magnetic layer, which is then dried. In this drying, the magnetic coating is not applied. A furnace called "air floating dryer" in which hot air is blown onto the magnetic support (magnetic tape) from above and below to dry the magnetic support while floating is sometimes used.

At the exit of such a drying furnace, a sheet body conveying device for conveying the sheet body which is the magnetic tape original sheet is arranged. This sheet body transporting device pulls out the magnetic tape raw material that has come out from the drying furnace, and sends it out to the downstream side where the next winding device and the like are arranged. It has a cylindrical guide roll and a magnetic tape raw material. A suction roll for adsorbing the cloth on the outer peripheral surface of the cylindrical shape is combined, and the magnetic tape stock that has come out of the drying furnace is wound and sent out in a substantially S-shaped cross section.

In addition, in this sheet conveying apparatus, a rocking stand on which both a cylindrical roll and a suction roll are placed, a detecting means for detecting a deviation of the magnetic tape material in the width direction, and a detecting means. There is provided a meandering correction mechanism having a drive means for moving the swinging mount based on information from the means.

As shown in FIG. 8, for example, the suction roll is covered with a nylon mesh 113, and a cylindrical roll portion 111 having a predetermined thickness L is provided with a large number of suction holes 112 having a diameter of dmm. . The suction roll 110 is introduced in place of the conventional rubber guide roll in order to improve the adhesion with the original magnetic tape, and performs suction action (vacuum) from the inside of the cylindrical roll portion 111. The magnetic tape stock, which moves and runs along the outer peripheral surface of the cylindrical roll portion 111, is brought into close contact with the suction hole 112. Therefore, this magnetic tape raw material is the cylindrical roll portion 11
It is possible to significantly reduce the slip caused between the magnetic tape raw material and the cylindrical roll portion 111 by being closely attached to the surface of No. 1.

As described above, according to the conventional sheet conveying apparatus, the original magnetic tape is wound around the cylindrical guide roll and the suction roll 110 in an S-shaped cross section and conveyed.

[0008]

By the way, since the suction holes 112 of the suction roll 105 are usually opened by so-called stitches having a diameter of about 2 to 3 mm by machining, suction through the suction holes 112 is performed. There is a problem that the film is deformed by force and remains as a transfer mark. When this transfer mark is generated, it causes a serious problem that the quality of the obtained magnetic tape is deteriorated. Especially when using a magnetic tape stock or the like having a small film thickness, the recording situation may be affected.

Therefore, the present invention has been proposed in view of such a situation, and enhances the adhesion between the suction roll and the sheet member traveling along the outer peripheral surface of the suction roll, resulting in a displacement of the traveling position. It is an object of the present invention to provide a sheet body transporting device capable of surely correcting the above and not causing a transfer mark.

[0010]

The present invention is proposed to achieve the above objects. That is, the sheet body conveying apparatus of the present invention is a sheet body conveying apparatus including a suction roll that supports a traveling sheet body on the outer peripheral surface thereof, wherein the suction roll is a metal cylindrical roll portion. It is characterized in that it has a mesh cylinder at the outermost periphery, in which a large number of suction holes having a diameter of 1 mm or less are opened by etching on the surface.

As the constituent material of the cylindrical roll portion,
A metal is preferable, and for example, Ni, Cr or the like can be used. A large number of suction holes are provided on the surface of the cylindrical roll portion. The size of this suction hole is 1 mm in diameter.
The following is desirable.

The sheet conveying apparatus of the present invention is suitable for use mainly when manufacturing a magnetic recording medium. The target magnetic recording medium here may be a so-called coating type magnetic recording medium in which a magnetic coating mainly composed of magnetic powder and a resin binder is coated on a non-magnetic support to form a magnetic layer, Alternatively, a so-called metal magnetic thin film type magnetic recording medium in which a metal magnetic thin film is formed as a magnetic layer on a magnetic support by a vacuum thin film forming technique may be used.

In the above-mentioned magnetic recording medium of the coating type, the magnetic powder, resin binder and the like contained in the non-magnetic support and the magnetic coating are all those conventionally used in this type of magnetic recording medium. It can be used and is not particularly limited. Similarly, in the above-mentioned metal magnetic thin film type magnetic recording medium, the nonmagnetic support and the metal magnetic material forming the metal magnetic thin film are all those conventionally used in this kind of magnetic recording medium. It can be used and is not particularly limited.

A mesh cylinder having a large number of fine suction holes on the surface of a cylindrical roll portion is used to correct the displacement of the traveling sheet while the sheet is being conveyed along the outer peripheral surface of the suction roll. By using a suction roll having an outer periphery, by performing suction from the inside of the cylindrical roll portion, the sheet body is adhered to the surface of the cylindrical roll portion through the mesh cylinder,
Sliding in the width direction is prevented.

At this time, since the cylindrical roll portion is made of metal and the suction holes of the mesh cylinder provided on the surface of the cylindrical roll portion are formed by etching, a large number of fine suction holes having a diameter of 1 mm are formed. It can be configured to be opened. By using the suction roll having such a configuration, the amount of change in the sheet body caused by the suction force per suction hole when the sheet body is brought into close contact with the cylindrical roll portion becomes small. . Therefore, transfer of the shape of the suction hole to the sheet body is suppressed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A sheet conveying apparatus to which the present invention is applied will be specifically described below with reference to the drawings. The sheet body conveying device according to the present embodiment is provided at the outlet of a drying furnace which is a so-called “air floating dryer”. This drying furnace uses powder magnetic materials such as oxide magnetic powder and alloy magnetic powder on the raw material of the magnetic tape, which is a sheet used in the process of manufacturing magnetic tape for recording information signals such as data signals and video signals. The magnetic paint dispersed in a binder made of an organic polymer material is applied and then dried in this drying oven.

Then, a conveying device for a sheet body is used to convey the above-mentioned magnetic tape raw material coming out of such a drying furnace to the subsequent manufacturing process. As shown in FIGS. 1 and 2, this sheet conveying device is a cylindrical type supporting a base film (magnetic tape original fabric) 1 which is a non-magnetic supporting member that moves and runs in the direction of arrow X in the figure. Of the suction roll 2, a cylindrical guide roll 3 arranged in parallel with the suction roll 2 with a predetermined distance Y from the suction roll 2, and the suction roll 2 and the guide roll 3 are fixed. It is composed of a support portion 4.

The suction roll 2 has a diameter slightly larger than that of the guide roll 3.
At the same time, it has a width substantially equal to the width of the magnetic tape material 1. As shown in FIGS. 3 to 5, the suction roll 2 includes a cylindrical roll portion 11 that supports the magnetic tape raw material 1 that is moved and run along the outer peripheral surface, and a cylindrical roll portion 11 of the cylindrical roll portion 11. A cylindrical inner cylinder 18 disposed inside, a drive shaft 16 for rotating the cylindrical roll portion 11 and the inner cylinder 18, and a fixed shaft 1 rotatably supporting the drive shaft 16.
5 and.

As shown in FIG. 6, the cylindrical roll portion 11 is made of metal having a predetermined thickness L1 and is formed with a suction hole 12 having a diameter d ₁ mm penetrating in the thickness direction. An air pump is connected to the inside of the cylindrical roll portion 11 via a suction pipe.

Therefore, when a suction action (vacuum) is performed from the inside of the cylindrical roll portion 11 through the suction hole 12, the magnetic tape is moved and run along the outer peripheral surface of the cylindrical roll portion 11. The original fabric 1 is brought into close contact with the surface to prevent slippage between the magnetic tape original fabric 1 and the cylindrical roll portion 11.

As the material of the cylindrical roll portion 11,
For example, Ni, Cr or the like can be used, but at least the surface may be made of these metal materials, and the surface may be plated with Ni, Cr or the like. A mesh cylinder 13 having a large number of suction holes 14 having a diameter d ₂ mm formed by etching is arranged on the surface of the cylindrical roll portion 11. That is, when suction is performed from the inside of the cylindrical roll unit 11, the magnetic tape original material 1 being conveyed is in close contact with the cylindrical roll unit 11 via the mesh cylinder 13.

Since the suction holes 14 are opened by etching, the mesh cylinder 13 having a large number of fine holes with a diameter of 1 mm or less can be manufactured. By forming the fine holes having a diameter of 1 mm or less, when the cylindrical roll portion 11 and the magnetic tape raw material 1 are brought into close contact with each other, the magnetic tape raw material is generated by the suction force of each of the suction holes 14. The amount of change of anti-1 is reduced. Therefore, even if the magnetic tape raw material 1 is a thin film medium, the transfer of the shape of the suction hole 14 to the magnetic tape raw material 1 is suppressed, and the deterioration of the quality of the medium can be prevented.

Further, since it becomes difficult for the shape of the suction hole 14 to be transferred, a large suction hole (having a diameter of about 2
It becomes possible to apply a stronger suction force as compared with the case of using a suction roll having about 3 mm). Therefore, the magnetic tape original 1 and the cylindrical roll 1
The adhesiveness between the magnetic tapes 1 can be enhanced, and the magnetic tape material 1 can be conveyed at a higher speed.

The shape of the suction hole 14 is not particularly limited and may be round, triangular or polygonal, but in the present embodiment, it is hexagonal as shown in FIG. In this embodiment, as shown in FIG. 6, the mesh cylinder 13 has a wall thickness L2 of 0.1 mm.
The size of the suction holes 14 formed in the mesh cylinder 13 is such that the distance d ₂ between the centers of the adjacent suction holes 14 is 0.32 mm.

Further, as shown in FIG. 1, the sheet body conveying device is provided with a meandering correction mechanism for correcting a running deviation of the magnetic tape material 1 which is a sheet body. In this meandering correction mechanism, the rocking pedestal 3 on which the guide roll 2 and the suction roll 3 are mounted is integrally corrected and moved together with the two rolls 2 and 3, and the deviation of the running of the magnetic tape original fabric 1 occurs. The basic configuration is made up of a detection means 20 for detecting the movement of the rocking pedestal, a rocking base 21, and a driving means for moving the rocking base 21 based on information from the detection means 20. In addition,
Here, the moving direction of the oscillating mount 21 is 1
It is a movement to return to the original accurate position with respect to the deviation of traveling in the width direction.

Further, when the detecting means 20 detects that the running position of the magnetic tape material 1 is displaced in the width direction, the meandering book correcting mechanism moves the swinging base 21 based on the information (FIG. (Not shown). The guide roll 2 and the suction roll 3 having the above-described configurations are placed on the rocking base 21, and are provided on the base via an air cylinder (not shown) that is a driving means for moving the rocking base 21. ing.

Further, the detecting means 20 is formed so that a part of the magnetic tape original fabric 1 passes through the concave detecting portion. As the detecting means 20, for example, any of an air type, an electric type, an ultrasonic type and the like can be used. When the detection unit 20 is connected to the control unit and detects that the running position of the magnetic tape original fabric 1 is displaced in the width direction, the information is transmitted to the control unit, and the control unit operates the air cylinder. Then, the swing pedestal 21 is moved and adjusted together.

Therefore, when the running position of the original magnetic tape 1 that has come out of the drying furnace is shifted by the concave detecting portion of the detecting means 20, the edge of the original magnetic tape 1 is detected. Then, the air cylinder is driven by transmitting the information to the control unit. Then, the swing base 2
Since the guide roll 2 and the suction roll 3 mounted on the unit 1 are integrally moved, it is possible to adjust the magnetic tape original fabric 1 whose traveling direction is deviated to the correct position.

By the way, when the original magnetic tape 1 as such a sheet is conveyed, slips in the width direction of the original magnetic tape 1 and transfer marks of the suction holes are likely to occur. Therefore, the meandering correction mechanism and the like are provided, but in the present embodiment, since the fine holes having a diameter of 1 mm or less are formed by etching, the cylindrical roll portion 1
1 and the magnetic tape raw fabric 1 are brought into close contact with each other, the change amount of the magnetic tape raw fabric 1 caused by the suction force of each upper pulling hole 14 is reduced. Therefore, even if the magnetic tape raw material 1 is a thin film magnetic tape, the transfer of the shape of the suction hole 14 to the magnetic tape raw material 1 can be suppressed.

Further, it becomes possible to apply a stronger suction force as compared with the case of using a suction roll having a large suction hole (diameter of about 2 to 3 mm) as in the prior art. Therefore, the adhesiveness between the magnetic tape raw material 1 and the cylindrical roll part 11 can be improved, and the magnetic tape raw material 1 can be conveyed at a higher speed. And
Even in such a case, the original function of preventing the suction roll 3 from slipping is effectively exhibited.

As described above, the sheet conveying apparatus of the present invention is suitable for use mainly in manufacturing a magnetic recording magnetic tape, but it is not limited to this as long as it conveys a sheet in the same manner. Needless to say, it is widely applied.

[0032]

As is apparent from the above description, in the present invention, the surface of the metal cylindrical roll portion is a suction hole having a diameter of 1 mm or less when correcting the displacement of the traveling position of the sheet body being conveyed. Since the suction roll covered with the mesh cylinder having a large number of the above is used, when the sheet body is brought into close contact with the cylindrical roll portion, the suction hole 1
The amount of change of the sheet body caused by the suction force per piece is reduced, and the anti-slip effect is enhanced. As a result, even if the thickness of the sheet body is thin, it is possible to prevent the transfer of the shape of the suction hole to the sheet body, and it is possible to prevent the deterioration of the quality of the magnetic tape.

Further, since the shape transfer of the suction hole is less likely to occur in this way, compared with the conventional case where a suction roll having a large suction hole (diameter of about 2 to 3 mm) is used, Since it becomes possible to apply a strong suction force, it is possible to enhance the adhesion between the sheet body and the cylindrical roll portion, and it is possible to sufficiently cope with an increase in the conveying speed of the sheet body.

The sheet conveying apparatus of the present invention comprises:
It is suitable for use in manufacturing a magnetic tape, and it is possible to suppress the occurrence of the above-mentioned transfer traces on the obtained magnetic tape, so that it is possible to provide a product with less deterioration in quality.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a schematic configuration of a sheet conveying device according to the present invention.

FIG. 2 is a plan view schematically showing the sheet conveying device.

FIG. 3 is a perspective view showing a configuration example of a suction roll in the sheet conveying device.

FIG. 4 is a plan view showing a configuration example of a suction roll in the sheet conveying device.

FIG. 5 is a cross-sectional view showing a configuration example of a suction roll in the sheet conveying device.

FIG. 6 is a cross-sectional view showing a configuration near the surface of a cylindrical roll portion.

FIG. 7 is a schematic diagram showing a surface shape of a mesh cylinder.

FIG. 8 is a cross-sectional view showing a structure in the vicinity of a suction hole of a suction roll in a conventional sheet conveying device.

[Explanation of symbols]

 1 Magnetic Tape Fabric (Sheet) 2 Suction Roll 11 Suction Roll Cylindrical Roll Section 12 Suction Roll Suction Hole 13 Suction Roll Mesh Cylinder 14 Mesh Cylinder Suction Hole 18 Suction Roll Inner Cylinder

Claims (2)

[Claims] 1. A conveyance device for a sheet body, comprising a suction roll for supporting a traveling sheet body on an outer peripheral surface thereof, wherein the suction roll has a diameter of 1 mm by etching on a surface of a metal cylindrical roll portion. A sheet body transporting device having a mesh cylinder having a large number of suction holes described below at the outermost periphery. 2. The sheet body is a magnetic tape stock having a magnetic layer formed on a non-magnetic support.
The sheet conveying device described.