JPH01252434A - Manufacture of paper feeding roll - Google Patents

Abstract

PURPOSE:To improve sliding stability and wear resistivity by forming a uniform protruding layer with a uniform hard layer at the surface of material. CONSTITUTION:A mechanical uneveness 2 is formed over the outer surface of a roll 1, and a resin film 3 is applied thereto to completely close the uneven ness 2. Next, the film 3 is dried and the roll 1c is set to have a specified dia. at its outer dia. by cutting. The film 3 intruded into the unevenness part 2 is solidified although, the tip ends of the part 2 are cut planely, and an exposed part 4 is formed by exposing one of the surface of material. A hard layer 5 is formed on the part 4. The film 3 is removed by a solvent so as to make the edge parts 5a to be resistors. The material 1 is further corroded to form a corrosion hole 6, whereby the exsistence of the layer 5 is deffinitely cleared, and the function of paper feeder is fully maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] 1. The present invention relates to a method of manufacturing a roll suitable for paper feeding used in 0A equipment and the like.

[Prior art] The rolls of such technology known as prior art include:
For example, there is one disclosed in Japanese Utility Model Application Publication No. 61-44451.

That is, there are rollers whose outer peripheral surface of the shaft is subjected to liquid honing or trihoning.

Furthermore, Japanese Utility Model Application Publication No. 62-65434 discloses a roller in which a plurality of ring bodies having rubber-like elasticity are attached to a rotatable synthetic core around the outer periphery of a roll shaft at appropriate intervals or closely. .

[Problems to be Solved by the Invention] However, with such conventional rolls, in the honing process, which is the former technique, depending on the hardness of the material,
The depth of surface irregularities is relatively small, and the dimensions of the surface after honing are not uniform.

In the latter technique, a protruding rubber body is attached to the shaft surface, but there are technical problems in gluing a rubber body made of a different material compared to the shaft, and furthermore, it is difficult to bond the rubber body to the paper surface. Although it plays a role as a resistor, stable contact with the paper quality or paper surface could not be expected.

[Means for Solving the Problems] Therefore, in order to effectively solve the problems with the conventional paper feed rolls, the present invention provides a method of mechanically roughening the surface of the shaft material and then applying roughening to the material. a first step of coating the material with a durable chemical film; a second step of exposing a portion of the material by cutting to make the outer surface uniform; and a hard layer on the exposed surface of the material. The third layer forms a uniform protruding layer with a uniform hard layer on the surface of the material.
The present invention provides a method for manufacturing a paper feed roll, which comprises the following steps.

[Function] In the present invention, after forming the irregularities by machining, a step of mechanically cutting the surface of the outer periphery again is provided, so that the diameter of the roll is guaranteed upon completion of the roll.

In addition, since the uneven surface that comes into contact with the paper surface is made of a hard material, it maintains wear resistance even after long-term use, and has high frictional resistance against the paper and is stable against the sliding of the paper. is guaranteed.

[Example] Hereinafter, the present invention will be explained in detail by referring to an illustrative example.

The paper feed roll manufacturing method of this embodiment can be divided into a first step to a third step.

That is, in the first step, as shown in FIG. 1, a light metal, for example a metal with a light specific gravity such as aluminum, is cut into a cylindrical shape to form the base of the roll 1.

Next, mechanical irregularities 2 as shown in FIG. 2 are formed on the outer surface of the roll 1. Since the mechanical unevenness 2 requires a substantially constant concave portion, knurling, rolling, etc. are used.

Therefore, it is desirable that the unevenness 2 be processed so that the intervals, sizes, etc. are uniform.

After the unevenness is completed, a resin film 3, such as a resist polymer 3, is applied so that the unevenness 2 is completely sealed. The resin film 3 is applied with care to ensure that it penetrates to the bottom of the unevenness.

Next, in the second step shown in FIG. 4, after the resin film 3 has dried, the film portions 3 protruding from the uneven portions 2 on the surface of the roll 1 are peeled off, and the outer diameter is made round. Therefore, the outer diameter of the roll 1 is mechanically cut to a predetermined diameter.

The film 3 that has penetrated into the uneven portion 2 by the surface cutting described above is solidified as it is, but the tip portion of the uneven portion 2 is further cut into a blanket shape to expose a part of the material surface to form an exposed portion 4. That is, since the unevenness 2 exists in the material 1, a part of the tip of the unevenness 2 is shaved off while the resin film 3 remains therein.

The third step is a step of forming a hard layer 5 on the exposed portion 4 exposed by cutting the surface of the material l.
may be a thin layer and can be obtained, for example, by hard plating, vapor deposition, nitriding, etc. These layers are desired to be hard and corrosion resistant.

In this way, the hard layer 5 is formed to protrude, and the surface angle portion of the hard layer 5 becomes the edge 5a.
Therefore, it is not necessary that the thickness be particularly thick.

After the hard layer 5 is completed as shown in FIG. 6, the resin film 3 applied earlier is further coated with a solvent such as methyl ethyl ketone so that the edge 5a of the hard layer 5 serves as a resistor for paper feeding. Dissolve and remove it professionally.

At that time, the material 1 is further corroded as shown in FIG. 7 to form a deep corrosion pattern ○ so that the hard layer 5 can provide sufficient resistance to the paper.

This corrosive liquid may be defined soda if the material is a light metal such as aluminum, or acid if the material is copper metal.

Thus, due to the existence of the corrosion formula 0 described above, the existence of the hard layer 5 becomes clear as shown in FIG. 8, and the function as a paper feeding device is sufficiently maintained.

Note that FIG. 8 is a conceptual diagram showing only one part of the protruding hard layer 5, and the black part at the tip shows the hard layer 5.

According to the paper feed roll manufacturing method described above, in the first step, the unevenness 2 on the surface of the roll material 1 is coated with a resin film, thereby protecting the unevenness described in IFj and leading to an accurate process in the next step. In the second step, by cutting the resin film to expose a part of the surface of the material 1, it is possible to obtain an accurate outer diameter, and in the third step, the 11nth part of the exposed surface of the material 1 can be obtained. By forming the hard protruding layer 5 on the surface, a strong resistance for paper feeding can be obtained.

Thus, according to the present method, by going through the steps from the first step to the third step, the roll as the initial material forms a protruding layer having a hard layer with high surface hardness, thereby making the paper It can be slid in a stable state.

[Effects of the Invention] As described above, according to the method of manufacturing a paper feed roll according to the present invention, the dimensional accuracy of the outer shape is high and the surface is kept in a predetermined position in the process from the first stage to the third stage. Since a protruding layer with high hardness is formed, it has high sliding stability against recording paper feeding required by OA type equipment, and is also wear resistant even after long-term use, so the paper will not be damaged.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams of the first step, that is, Figure 1 is the roll material used in this method, Figure 2 is a diagram showing mechanical unevenness formed on the roll surface, and Figure 3 is a resin coating film. It is a figure showing the state where it applied. FIG. 4 is a diagram illustrating the second step, in which the coating film is cut to expose a part of the surface of the roll material. Figures 5 to 7 are explanatory diagrams of the third step, that is, Figure 5 is a diagram with a hard layer formed on the exposed surface, Figure 6 is a diagram with the coating film subsequently dissolved and removed, and Figure 7 is a diagram with the hard layer removed. It is an explanatory view of melting the material in order to make it protrude further. FIG. 8 is a partially enlarged view of the hard layer itself. l... Roll wood 2... Uneven surface 3... Paint film portion 4... Exposed surface 5... Hard layer 6... Paint film removed surface 7... Protruding layer

Claims (1)

[Claims] A first step in which the surface of the shaft material is mechanically roughened and then coated with a chemical film that is resistant to the material; and a second step in which a part of the material is exposed by cutting to make the outer surface uniform in shape. A paper feed roll comprising two steps, and a third step of forming a uniform protruding layer with a uniform hard layer on the surface of the material by forming a hard layer on the exposed surface of the material. manufacturing method.