JPH0225794Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an adsorption/transfer body, and relates to an adsorption/transfer roller used, for example, in a transfer device that uses static electricity to attract and transfer paper cloth.

(Prior art) A suction transfer roller (hereinafter referred to as a roller) used in a paper transfer device that utilizes electrostatic adsorption force is composed of a high dielectric layer formed around a metal drum-shaped core. It is something. In order to attract paper cloth to the surface of the roller, a high voltage is applied between the core metal and a ground electrode provided opposite the roller to induce electrostatic charge in the high dielectric layer. It is configured.

To manufacture a roller, a material made of a dielectric material with a high dielectric constant such as rubber or synthetic resin is wrapped around the outer periphery of a drum-shaped core metal to an appropriate thickness, and two semi-cylindrical molds are used. Press it on top of it and vulcanize it under pressure. Due to the pressure vulcanization, the excess dielectric material is
It flows out from the butt part of the two molds.

The roller manufactured in this manner has two seam lines in the dielectric layer corresponding to the butt portions of the two semi-cylindrical molds. This seam line can be made superficially smooth by contour polishing.

(Problems to be Solved by the Present Invention) However, according to research by the present inventors, the above seam line causes electrical leakage when high voltage is applied, making it difficult to attach or remove paper fabrics. It has been discovered that there is a risk of electric shock if you touch the product.

SUMMARY OF THE INVENTION An object of the present invention is to provide an adsorption/transfer body that eliminates the risk of electric shock caused by the seam line that occurs during the formation of a dielectric layer.

(Means for solving the problem) In order to solve the above problem, the present inventors investigated the seam line and found that many pinholes were generated at the seam line. It was discovered that high voltage leaked out and that touching it with the hands would result in an unpleasant tingling shock. Therefore, the present invention is designed to prevent pinholes from penetrating the dielectric layer from the metal core and reaching the surface.

That is, the attraction/transfer body of the present invention is an attraction/transport body consisting of a cylindrical core metal and a dielectric layer formed around the outer periphery of the core metal, and the dielectric layer is composed of at least two laminated layers. It is characterized in that the position of the seam line portion of the first dielectric layer and the position of the seam line portion of the second and subsequent dielectric layers are shifted from each other.

(Function) As shown in the above configuration, the present invention comprises at least two or more layers of the dielectric layer coated on the core bar of the adsorption/transfer body, and the first dielectric layer By shifting the seam line portion that occurs during molding and the seam line portion that occurs during molding of the second and subsequent dielectric layers to be at different positions on the core bar, there is no seam line portion that penetrates the entire dielectric layer. Therefore, when a high voltage is applied, the leakage path at the seam line is interrupted midway, eliminating the risk of electric shock.

(Description of an Embodiment) FIG. 1 shows a sectional view of an embodiment of a roller according to the present invention, in which a first dielectric layer 2 having a ferroelectric constant and a second dielectric layer 2 are formed on a drum-shaped core 1. A body layer 3 is provided, a seam line 4 of the first dielectric layer 2,
4' and the seam lines 5, 5' of the second dielectric layer 3 are staggered so that they are not at the same position. In this way, seam lines 4, 4' and 5,
By staggering 5', there are almost no pinholes that penetrate the entire dielectric layer of the stack of first and second dielectric layers, so that the risk of electric shock is almost completely eliminated.

The formation of the dielectric layer is as shown in FIG.
After wrapping a slightly larger amount of dielectric material 6 than necessary around the outer periphery of the dielectric material 6, the material is pressurized and vulcanized in the directions of arrows P and P' in the figure using semi-cylindrical molds 7 and 8. Excess dielectric material is discharged from the abutting portions of the molds 7 and 8, and a dielectric layer of an appropriate thickness is formed, but the formed dielectric layer has seams corresponding to the abutting portions. A line is formed. Pinholes are likely to occur along the seam line, and the incidence of pinholes is as high as 30% of the entire product. Therefore, it can be seen that there is a considerable risk of electric shock in products with a single dielectric layer. In this invention,
After forming the first dielectric layer by the molding method shown in FIG. 2, a second dielectric layer is formed by changing the pressing direction of the molds 7 and 8 shown in FIG. Note that the materials for the dielectric layers 2 and 3 may be the same, and the composition and blending ratio (parts by weight) of a typical example are: Acrylonitrile rubber 100 parts Stearic acid (processing aid) 1 to 5 parts Silicon oxide (inorganic reinforcing agent) ) 50-100 parts Phenol resin 5-30 parts Sulfur (vulcanizing agent) 1-15 parts Mercaptobenzothiazole (vulcanization accelerator)
0.3 to 2 parts Dioctyl phthalate (plasticizer) A combination of trace amounts can be exemplified.

Note that the number of dielectric layers is not limited to only two layers, and can generally be two or more layers. Further, the material of the dielectric layer may be different for each layer.

(Effects of the invention) As detailed above, in the present invention, pinholes are almost completely eliminated throughout the dielectric layer by making the dielectric layer have a multi-layered structure and shifting the arrangement of the seam lines. It is possible to realize a safe suction transfer body with less risk of electric shock.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure shows a method of forming a dielectric layer. DESCRIPTION OF SYMBOLS 1... Core bar, 2... First dielectric layer, 3... Second dielectric layer, 4, 4'... Seam line of first dielectric, 5, 5'... Second dielectric layer Dielectric seam line, 6... dielectric material, 7, 8... mold for molding.

Claims (1)

[Claims for Utility Model Registration] An adsorption/transfer body consisting of a cylindrical core and a dielectric layer formed around the outer periphery of the core, wherein the dielectric layer is composed of at least two laminated layers. , wherein the position of the seam line portion of the first dielectric layer and the position of the seam line portion of the second and subsequent dielectric layers are arranged so as to be shifted from each other.