JP2004269109A - Resinous winding core and supporting structure therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discharge static electricity generated when a film and the like is wound around a winding core, to the outside through a chuck. <P>SOLUTION: In the winding core 11, through holes 4 penetrating from the inside to the outside are provided on axial both end portions of a resinous cylindrical core material 2, and conductive resin is coated on the outer peripheral surface of the core material 2 to form a conductive layer 3, and the through holes 4 are filled with the conductive resin to form a short-circuit portion. The short-circuit portion 5 is exposed on the inner peripheral surface of the core 2 while conducting with the conductive layer 3. The conductive chuck 10 is fitted in the inner periphery of both ends of the core 2, so that the chuck 10 contacts with the short-circuit portion 5, and static electricity generated on a film F is discharged through the chuck 1 in a grounding condition. The chuck 10 has a holding member 15 actuated by compressed air supplied to a cylinder chamber 13 in the inside. The holding member 15 press-contacts with the inner periphery of the core 2, so that the winding core 11 is fixed to the chuck 10 and enabled to rotate. At that time, the holding member 15 contacts with the short-circuit portion 5 to make the conductive layer 3 be in the grounding condition, so that work of grounding is unnecessary. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a resin core for winding a relatively thin material such as a film or a sheet, and a support structure for rotatably supporting the core.
[0002]
[Prior art]
Generally, in a process of manufacturing a relatively thin material such as a film or a sheet, a cylindrical resin core is used to wind the film or the like. The core is rotatably supported at both ends by chucks. After fixing an end of a long film or the like to a part of the side peripheral surface, the core is rotated to rotate the film or the like. Roll up. The wound film or the like is transported to a predetermined processing step in that state.
[0003]
In this manufacturing process, a very thin film or the like that is frequently used in recent years is liable to be wrinkled or damaged due to generation of static electricity or the like in a process of being wound around a core. In addition, since charging of a magnetic tape or the like may affect a product after completion, it is necessary to strictly prevent charging. For this reason, as shown in FIG. 7, a conductive layer 3 is provided by coating a conductive resin on an outer periphery of a core material 2 constituting the core 1, and a static electricity charged on a film or the like is transferred to the conductive layer of the core 1. 3 to discharge to the outside to remove. (See Patent Document 1)
[0004]
[Patent Document 1]
Japanese Patent Publication No. Hei 3-8938
[Problems to be solved by the invention]
However, conventionally, since the conductive layer on the outer peripheral surface of the core is not grounded, it is not possible to smoothly remove static electricity charged on the conductive layer unless a means for grounding the conductive layer is separately provided. There was a problem.
[0006]
Accordingly, an object of the present invention is to make it possible to easily discharge static electricity charged on a conductive layer to the outside.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention focuses on the fact that the chuck is generally made of an iron conductor and is grounded through the frame, and the chuck is provided with a conductive layer on the outer peripheral surface of the core. Was short-circuited. With this configuration, the static electricity generated by winding the film or the like is grounded from the conductive layer through the chuck, and is smoothly discharged to the outside.
[0008]
As a specific configuration of the winding core that achieves the effect, a conductive layer is formed on the outer peripheral surface of a cylindrical resin core material, and a short-circuit portion is formed from the conductive layer on the inner peripheral surface of the core material. The short-circuit portion is exposed at a portion in contact with the chuck. By doing so, the chuck and the short-circuit portion are inevitably brought into contact with each other by fitting the chuck to the core, so that there is no need to perform an operation for electrically connecting the conductive layer and the chuck.
[0009]
The conductive layer may be formed by applying a known method of attaching a metal frame or a metal sheet or the like to the surface of the core material, but by coating the surface of the core material with a conductive resin and forming the short-circuit portion, It may be configured to be formed along the end face of the core material. With this configuration, the short-circuit portion can be formed at the end of the core material and at the same time as the conductive layer, so that the core can be easily manufactured.
[0010]
In addition, a configuration may be adopted in which a through-hole penetrating the inner and outer peripheral surfaces of the core material is provided, and a short-circuit portion is provided in the through-hole together with formation of the conductive layer by the coating. In this case, the short-circuit portion is protected in the through hole and is not damaged. At this time, if the short-circuit portion is formed by pouring a conductive resin into the through hole, the core can be easily manufactured.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment is shown in FIGS. 1 and 2, and the resin core of this embodiment is rotatably supported for winding up a film or the like in a process of manufacturing a relatively thin material such as a film or a sheet. The core 11 is made of resin.
[0012]
As shown in FIG. 1, the winding core 11 includes a cylindrical core material 2 formed of an FRP tube formed by a known filament winding method or the like, and a conductive layer 3 provided on the outer periphery thereof. As shown in FIG. 2, the core material 2 has through holes 4 penetrating the inner and outer peripheral surfaces at both ends in the axial direction, and a method such as applying and spraying a conductive resin on the outer peripheral surface of the core material 2. The conductive layer 3 is formed by coating using the same method, and the same conductive resin is filled in the through holes 4 to form a short-circuit portion 5 extending from the conductive layer 3 to the inner peripheral surface of the core 2. The short-circuit portion 5 is exposed on the inner peripheral surface of the core material 2 while conducting with the conductive layer 3. As the conductive resin, an epoxy resin or the like containing a conductive material such as carbon is used.
[0013]
As shown in FIGS. 4 and 5, the support structure of the chuck 10 fitted to the core 11 has a chuck body 12 having a cylinder chamber 13 into which compressed air is supplied, and a pressure of the compressed air in the cylinder chamber 13. There is a pneumatic type that includes a holding member 15 that moves in conjunction with a piston 14 that is operated by a piston.
[0014]
When the chuck 10 is inserted into the inner periphery of the core material 2 and pressure is applied to the cylinder chamber 13, the piston 14 is pressed radially outward of the chuck body 12, as shown by an arrow in FIG. A holding member 15 connected to 14 also moves outward. As shown in FIG. 4, the outer periphery of the holding member 15 forms an arc surface along the inner peripheral surface of the core 2, and the outer periphery of the holding member 15 comes into pressure contact with the inner periphery of the core 2. The core 11 is fixed to the chuck 10 and is rotatable together with the chuck 10.
[0015]
After fixing the end of the long film F to the outer peripheral surface of the fixed core 11, the core 11 is rotated to wind the film F. When static electricity is generated in the film F in the winding process, the static electricity is conducted from the film F to the conductive layer 3 and the conductive layer 3 is charged. At this time, as shown in FIG. 3, the conductive chuck 10 is fitted on the inner periphery of both ends of the core material 2, and the holding member 15 and the short-circuit portion 5 are in contact with each other. The charged static electricity is discharged to the outside through a grounding portion such as equipment supporting the chuck 10 and a frame, and is removed.
[0016]
By doing so, if the chuck 10 is fitted to the winding core 11, the conductive layer 3 is grounded, so that a special grounding work is not required, which is convenient.
[0017]
The short-circuit portion 5 can be freely provided as long as the short-circuit portion 5 is exposed at a portion in contact with the chuck 10. For example, as shown in FIG. 1, a single location may be provided around the circumference of the core 11, or a plurality of locations may be provided. Further, as shown in FIG. 2, the core material 2 may be provided at both axial ends, or may be provided only at one end.
[0018]
The material of the winding core 11 is not limited to this embodiment as long as it has strength enough to withstand winding of a thin material such as the film F or other sheets, and the core is made of a well-known reinforced plastic core. Materials can be used. Further, the material forming the conductive layer 3 may be any material having conductivity, and is not limited to the resin of this embodiment.
[0019]
In this embodiment, in order to form the conductive layer 3, a method of applying a conductive resin by application, spraying or the like is used. However, the present invention is not limited to this method. Other methods for performing the coating include, for example, Alternatively, a method of forming the conductive layer 3 on the surface of the core material 2 by immersing the core material 2 in a tank filled with the conductive resin can be adopted. According to this method, the surface and the end face of the core material 2 are coated, and the production of the core 1 is easy.
[0020]
Further, as a method of providing the conductive layer 3, a method other than the coating can be adopted. For example, a method of fitting a metal frame around the outer periphery of the resin core material 2, or a method of attaching a metal sheet, A method in which a conductive material is laminated on the surface of the core material 2 to provide the conductive layer 3 may also be adopted.
[0021]
In addition, if the whole of the core 1 is made of a tube made of conductive reinforced plastic, it is not necessary to coat the conductive layer 3 on the core material 2 such as the reinforced plastic tube, so that the production is easy. It is.
[0022]
Further, in this embodiment, the short-circuit portion 5 is installed in the through hole 4 provided in the core material 2, but is not limited to this embodiment. For example, as shown in FIG. A configuration in which the short-circuit portion 5 is provided on the surface of the end face can be adopted. In this manner, as shown in the figure, when using a well-known chuck 20 having a truncated cone shape and a tapered surface on its surface, the tapered surface 21 of the chuck 20 is connected to the short-circuit portion 5 at the end surface of the core 11. Contact. At this time, if the short-circuit portion 5 is provided in an annular shape over the entire circumference of the end surface of the winding core 11, the tapered surface 21 contacts the short-circuit portion 5 at any position over the entire circumference. Can be reliably conducted.
[0023]
As described above, when the short-circuit portion 5 is provided on the end face of the core material 2, the conductive layer 3 and the short-circuit portion 5 can be easily formed by the method of immersing the core material 2 in the tank filled with the conductive resin as described above. Can be manufactured. In addition, as shown in FIG. 6, if the conductive layer 3 is also provided on the inner periphery of the core material 2, the above-mentioned pneumatic chuck 10 can be used.
[0024]
【The invention's effect】
According to the present invention, as described above, static electricity can be discharged to the outside via the chuck supporting the core.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of one embodiment. FIG. 2 is a partially cut front view of the same embodiment. FIG. 3 is an enlarged cross-sectional view of an essential part of the same embodiment. FIG. FIG. 5 is a sectional front view of the same embodiment. FIG. 6 is a sectional front view of another embodiment. FIG. 7 is a sectional view of a main part of a conventional example.
1, 11 winding core 2 core material 3 conductive layer 4 through hole 5 short circuit portion 10, 20 chuck 12 chuck body 13 cylinder chamber 14 piston 15 holding member 21 tapered surface F film

Claims (4)

A conductive layer 3 is formed on the outer peripheral surface of the cylindrical resin core 2, and a short-circuit portion 5 is formed on the inner peripheral surface of the core 2 from the conductive layer. A resin winding core exposed at a portion in contact with a conductive chuck fitted to a portion. The resin winding according to claim 1, wherein the conductive layer (3) is formed by coating the surface of the core material (2) with a conductive resin, and the short-circuit portion (5) extends along an end surface of the core material (2). core. The conductive layer (3) is formed by coating the surface of a core material (2) with a conductive resin, and the short-circuit portion (5) is provided in a through hole (4) penetrating an inner and outer peripheral surface of the core material (2). The resin core described. 4. A structure in which the resin core according to claim 1 is supported by fitting chucks at both ends thereof, wherein the chuck is grounded as a conductive material and is in contact with the short-circuit portion 5. The support structure of the resin core.

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