JPH082674B2 - Platen roller core for printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a core metal of a platen roller for a printer, which is a terminal of OA equipment.

<Prior Art> A platen roller for a printer has a structure in which an elastic cylindrical body such as rubber is fitted to the outer peripheral surface of a cored bar.

<Problems to be Solved by the Invention> A platen roller for a printer generates an unpleasant sound due to the impact of a print head, especially when a dod printer is used. In order to reduce this unpleasant sound, the cored bar has various structures. For example, as shown in FIG. 4 (A), a small pipe 2 is formed in the inner center of the aluminum pipe 1, and this small pipe 2
And the inner diameter of the aluminum pipe 1 are connected and integrated by three ribs 3 to form a hollow section 4, which has a foamed resin 5 filled in the aluminum pipe 1 as shown in FIG. 4 (B). And an aluminum shaft 6 as shown in FIG. 4 (C). These are more effective in reducing noise than the core made of iron, but in the case of FIG. 4 (A), they are 55 to 62 phones, in FIG. 4 (B) they are 60 to 65 phones, and in FIG. If 50 ~
A 55-phone impact sound is being generated.

It is desirable that the impact sound allowed in offices is 50 phones or less, and it is strongly required. In the conventional core metal, the aluminum shaft 6 shown in FIG. 4 (C) has the most noise reduction, but it is disadvantageous in that it is expensive and heavy. In such a cored bar, sound reduction, light weight and low cost are important issues.

<Means for Solving Problems> The present invention provides a core metal for a platen roller for a printer, which satisfies all the above problems, and is characterized by a rubber elastic cylinder on the outer peripheral surface. Is a core metal of a platen roller for a printer in which is fitted, and a wooden columnar member in which phenolic resin is impregnated in wood is tightly fitted in a cylindrical body made of a metal material.

<Operation> With the above configuration, the vibration transmitted to the cylindrical body made of a metal material is absorbed by the wooden columnar member in which the phenolic resin in the cylindrical body is impregnated in the wood to effectively attenuate the sound. Moreover, the wooden columnar member is lightweight and inexpensive.

<Examples> Examples of the present invention will be described below with reference to FIGS. 1 to 3. In FIG. 1, 10 is a platen roller for a printer, and 11 is a cylindrical body made of a metal material which is a core metal. The metal material of the cylindrical body 11 is aluminum, stainless steel,
This is due to iron, etc. An elastic cylindrical body 12 made of rubber or the like is fitted on the outer peripheral surface of the cylindrical body 11. Reference numeral 13 is a support shaft projecting from both ends of the roller.

The present invention has a structure in which a wooden columnar member 14 is tightly fitted in a cylindrical body 11 made of a metal material which is the core metal.

The wooden columnar member 14 is obtained by impregnating the solid wood columnar member 14 with phenol resin in the wood. Further, as shown in FIG. 3, a synthetic resin pipe 15 may be fitted integrally with the outer peripheral surface of the solid wood columnar member 14.

Since the present invention has the structure as described above, the elastic cylindrical body 12
The vibration of the printing impact that is propagated from the cylindrical body 11 made of a metal material to the wooden columnar member 14 that is closely fitted in the cylindrical body 11 is transmitted in addition to the sound absorption characteristics of the tree itself. By virtue of the synergistic effect of the impact resistance of the phenol resin impregnated in the wood, the vibration level is lowered, and the noise reduction effect is efficiently performed to reduce it to 50 phon or less.

<Effects of the Invention> As described above, according to the present invention, the core metal of the platen roller for a printer in which the wooden columnar member in which the phenolic resin is impregnated in the wood is tightly fitted in the cylinder made of the metal material is printed. The unpleasant sound due to impact can be effectively reduced, and the rigidity of the wooden columnar member can reduce the thickness of the cylindrical body made of a metal material. By the wooden columnar member and the cylindrical body made of a thin metal material, The weight reduction and the cost reduction are achieved, and it has a particularly remarkable effect of being able to provide an ideal core metal for a platen roller for a printer.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a platen roller for a printer using the core metal of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a sectional view showing another embodiment of the present invention, and FIG. 4 is an end view of a conventional cored bar. 10 …… Platen roller for printer, 11 …… Cylindrical body made of metal material, 13 …… Support shaft, 14 …… Wooden column member, 15
...... Synthetic resin pipe.

Claims (1)

[Claims] 1. A metal core of a platen roller for a printer, the outer peripheral surface of which is fitted with a rubber elastic cylindrical body, the wooden cylindrical member being made of a metallic material and having a phenol resin impregnated in the wood. A core metal for a platen roller for a printer, which is closely fitted.