JPH0256351A - Paper feed roller - Google Patents

Abstract

PURPOSE:To make a roller surface effect sufficient frictional force and stably feed a recording paper by projecting out a part of hard film on the surface by means of corrosion. CONSTITUTION:The surface of a soft metal body (e.g., aluminum alloy) 4 is coated with a thin-wall metal film 5 having a property harder than the soft metal body 4 and then formed into a fine lump shape. This fine-lump shaped fine particle body 2 is mixed with a fine lump body 3 of a separately prepared same soft metal body and heated and compressed to be molded into a roller shape 1. The molded surface is corroded to expose only the hard material 5. As a result, the surface of the roller 1 can effect high frictional force, to stably feed a record paper used for OA equipment, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roll used in OA equipment and the like to move recording paper. Regarding the paper feed roll.

[Prior Art] Most of the current OA equipment is equipped with roll paper for recording, and the paper is sent out by a roll. 11 during driving along with driving accuracy? ■Required a roll that would prevent the writing paper from slipping.

Therefore, Japanese Utility Model Application Publication No. 55-63339 discloses a technique in which the surface of the roll is coated with ceramic to give it a rough surface in order to improve the durability of the roll and to perform it efficiently and smoothly.

Also, Utility Model Application No. 63-1958 and Utility Model Application No. 63-1959
The issue discloses a technique for mixing ceramic powder as a material that provides frictional resistance to the surface.

Furthermore, in JP-A No. 63-134603, metal powder is used as the material, and by compression molding it, the roughness of the surface created during the molding is used to create a boob for small equipment with high frictional force. The technology has been disclosed.

[Problems to be Solved by the Invention] However, in such conventional technology, although there has been great progress in improving durability because the ceramic is hard like the above-mentioned ceramic, when it is melted as a material, at the same time The difference in specific gravity is too large compared to the metal or other material to be mixed, and as a result, there is a problem that the ceramic tends to be biased to one position during mixing, and uniform dispersion cannot be expected.

In addition, the ceramic itself has high hardness, resulting in poor workability and the need for uniform processing, resulting in a lack of mass production.

[Means for Solving the Problems] The present invention was developed to effectively solve the conventional problems, and includes a soft metal body having a surface harder than the soft metal body. After being coated with a thin metal film, it is made into a fine lump, and 1) The fine powder that has been made into a fine lump is mixed with a separately prepared fine lump of the same soft metal body and heated and compressed to form a roll shape. The present invention also provides a paper feeding roll that exhibits high friction by exposing only the hard material by corroding the molded surface.

[Function J] In order to obtain high friction, the present invention exposes a hard material on the surface of the roll, and as a means to do so, a part of the hard material υ is made to protrude from the surface by corrosion. As a result, the hard covering ring produces the effect of increasing blood pressure, and the hard part is less likely to fall off.

Furthermore, since the hard covering is formed in a ring shape as shown in +ji, it is in line contact with the surface of the metal belt, so that stable blood pressure can be maintained.

[Example] Hereinafter, one embodiment of the present invention will be described in detail.

As the material of the roll according to this embodiment, an aluminum alloy is used, for example.

That is, on the surface of a soft metal body 4 such as aluminum,
After chemically or electrochemically coating a thin metal coating 5 having properties harder than the aluminum metal body 4 shown in FIG. , by heating and compressing the fine lump 3 of the same aluminum metal body prepared separately, molding it into the roll shape 1 of the required shape, and chemically reaction corroding the molded surface. Only the hard material 5 is exposed from the surface of the roll 1.

Here, the fine powder 2 described above in FIG.
- Electroless plating that becomes a P alloy can be chemically coated and then mechanically cut into slices for use, or as shown in Figure 3, it can be first made into fine aluminum powder 4 and used as it is. - Perform electroless plating with P alloy, and harden layer 5
Form and use as is.

Then, the hard aluminum body 2 with the hard coating described above is mixed into the material 3 made of uniformly finely powdered aluminum. The mixing ratio should be 50/50, or the aluminum material 3 should be slightly larger.

Next, the two types of aluminum metal bodies described in 1111 are thoroughly mixed, pressurized, and heated to near the melting point of aluminum, but heated to such an extent that the aluminum material does not completely melt. As a result, as shown in FIG. 4, the two become a completely integrated alloy through this process.

Moreover, the hard material 5 mixed therein is fixed in the form of an alloy without being deformed.

The roll shape is sized to match the width of the paper, and the molding surface is further mechanically processed to make it smooth as shown in FIG.

After the molded surface has become mirror-like so as to match the paper surface against which it slides, chemical corrosion is performed.

That is, when the material is aluminum, supinated soda is used as a corrosive agent.

When the surface of the aluminum material 3 is slightly corroded due to this corrosion, a part of the aluminum material 4 inside the hard metal body 5 is also corroded and dissolved, and only the hard material 5 is circular as shown in FIG. protrudes in an annular shape.

Since the tip of this hard body 5 is cut faithfully into a flat body by the above-described machining process as shown in FIG. The effect can be demonstrated as follows.

[Effects of the Invention] As shown in f= below, in order to obtain high friction in the paper feed roll according to the present invention, a hard material is exposed on the roll surface. By making the part protrude from the surface to obtain resistance at the cut surface of the surface, the part of the hard coating that comes into contact with the paper surface receives it at the edge, and therefore the surface pressure is evenly received and the paper surface is It can be sent out stably without being damaged.

Moreover, since the aluminum material in the ring-shaped hard covering is fixed integrally with the roll material, it will not fall off and stable driving can be achieved over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a paper feeding roll according to the present invention,
Fig. 2 shows a state diagram in which a hard coating is formed in step 8, cut at point B, and Fig. 3 shows a state diagram in which a hard part is formed with aluminum powder in another embodiment. , Fig. 4 is a conceptual diagram of the surface machined after mixing, Fig. 5 is a conceptual diagram of the corroded hard part exposed, and Fig. 6 is a diagram explaining the exposed hard part. . Paper feeding roll Hard aluminum material Aluminum material Hard coating

Claims (1)

[Claims] The surface of a soft metal body is coated with a thin metal film that is harder than the soft metal body, and then made into fine pieces, and the fine powder made into fine pieces is then separately prepared into fine pieces of the same soft metal body. A paper feeding roll characterized in that the material is mixed into a mass and heated and compressed to form a roll shape, and the surface of the molded material is corroded so that only the hard material is exposed.