JPH09286538A - Paper feed roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate trouble of winding of paper due to adhesiveness in the high temperature high humidity atmosphere, by providing a resin coat of rough surface in a surface of a metal-made core roll, facilitating manufacture, and enhancing surface dimensional accuracy. SOLUTION: Resin system paint is spray painted on a stainless steel-made core metal. Here, a delivery amount is adjusted so as to obtain prescribed surface roughness. After drying at an ordinary temperature, heating and drying are performed at a temperature suited for resin, a paper feed roll is obtained. The obtained paper feed roll has a suitable coefficient of friction, and this coefficient of friction is stable without decreasing by adhesion of paper powder or the like even after long period use. Accordingly, a good paper feed roll, having high dimensional accuracy of a surface without winding of paper even under the high temperature high humidity atmosphere, is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll (hereinafter, referred to as a roll for feeding / conveying a paper sheet such as a paper to be conveyed in an OA device, an electric appliance, an ATM (financial terminal payout device) or a printing machine. Paper feed roll).

[0002]

2. Description of the Related Art Conventionally, OA equipment, electrical appliances, ATM
(Financial terminal payout device) or a paper feed roll is used to feed and convey paper such as paper to be conveyed in a printing machine, etc. It is required that the paper feed pitch is small, the paper feed performance is stable against changes in temperature and humidity, and the paper dust and the like are hard to adhere to the paper.

Conventionally, a paper feed roll has been known in which the coefficient of friction of the surface is increased to improve the paper feed performance. For example, a metal roll surface is roughened by knurling or sandblasting. , Or a ceramic whose surface is roughened (see Japanese Utility Model Laid-Open No. 55-63339), or a roll whose outer peripheral surface has been subjected to liquid honing or dry honing (Actual No. Sho 61- No. 44451) and the like are known.

[0004] All of these rolls are inadequate in terms of paper feed characteristics, and further have manufacturing problems. In addition, there is a case where surface irregularities are relatively small and the dimensional accuracy of the surface is not high. In any case, none of the required characteristics can be satisfied.

Further, there is a paper feed roll in which a plurality of ring bodies having rubber-like elasticity are mounted on the outer circumference of the roll shaft at appropriate intervals or in close contact (Japanese Utility Model Publication No. 62-65434).

However, although this one has higher surface dimensional accuracy than providing a rubber-like elastic body integrally on a shaft, it has a problem in close contact or mounting, and further has poor paper feeding performance, and paper dust and the like are not generated. There is also the problem of easy adhesion.

Further, a mixed powder of a metal alloy material having a high corrosion resistance and another metal alloy material having a high hardness is compression-molded, the surface is made uneven by corrosion, and then a paper feed coated with a hard coating is carried out. Rolls are known (see Japanese Patent Laid-Open No. 2-56350).

However, although such a roll has high dimensional accuracy, there is a problem in that the manufacturing process is complicated.

[0009]

The above-mentioned conventional paper feed roll is intended to improve the paper feed performance by increasing the friction coefficient of the surface. Good adhesion and dimensional accuracy have not been obtained.

In view of the above-mentioned conventional circumstances, the present invention has a high surface dimensional accuracy, has no problem such as paper wrapping due to adhesiveness even in a high temperature and high humidity atmosphere, and has no problem of paper dust adhesion and the like. It is an object of the present invention to provide a paper feed roll that has good quality and is easy to manufacture.

[0011]

A first aspect of the present invention for solving the above problems is characterized in that a resin coating layer having a rough surface is provided on the surface of a metal core roll. On the roll.

Here, the surface roughness Rz of the paper feed roll
Is, for example, in the range of 5 to 20 μm.

The resin coat layer is formed of, for example, a resin paint.

The resin coat layer is formed, for example, by applying a urethane-based or silicone-based paint.

Since the paper feed roll of the present invention has only the resin coating layer having the roughened surface provided on the metal core roll, the paper feed roll is easy to manufacture and has good surface dimensional accuracy. Moreover, since the surface of the resin coat layer is a rough surface, the coefficient of friction is reasonably high, the paper feed characteristics are good, and paper dust is difficult to adhere, and particularly, silicone resin-based and fluororesin-based When the coat layer is used, paper dust or the like is less likely to adhere.

The metal core roll used for the paper feed roll of the present invention may be one conventionally used, for example,
Steel, stainless steel, aluminum or the like can be used.

The method for forming a resin coat layer having a rough surface on the core roll in the present invention is not particularly limited.
In particular, it can be formed very easily by applying a resin-based paint by spray coating or the like.
That is, for example, a resin coating layer having a rough surface can be easily formed by discharging a water-emulsion type coating material with a suitable discharging amount from a suitable distance and drying.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on Examples.

(Examples 1 to 3) A urethane water emulsion paint, a silicone resin paint, and a nylon resin paint were spray-coated on a stainless steel cored bar. At this time, the discharge amount was adjusted so that the surface roughness Rz was 5 to 10 μm and 10 to 15 μm. After drying at room temperature, it was heated and dried at a temperature suitable for the resin to obtain the paper feed rolls of Examples 1 to 6 as shown in Table 1 below.

The initial coefficient of friction of the obtained paper feed roll was measured. Further, each roll was attached to a paper passing machine, and the friction coefficient after 50,000 sheets of A4 copy paper were conveyed was similarly measured. Table 1 shows the results.

(Comparative Examples 1 to 6) A urethane water emulsion paint, a silicone resin paint, and a nylon resin paint were spray-coated on a stainless steel core metal in the same manner as in the above embodiment. At this time, the discharge amount was adjusted so that the surface roughness Rz was 0 to 1 μm and was smaller than 5 μm. Then, it was heated and dried in the same manner as in Examples to obtain the paper feed rolls of Comparative Examples 1 to 6 as shown in Table 1 below.

With respect to each of the obtained paper feed rolls, the friction coefficient at the initial stage and after passing 50,000 sheets were measured in the same manner as in the examples.
In addition, for comparison, the same test was performed for the case where the resin coat layer was not provided. Table 1 shows the results.

[0023]

[Table 1]

As is clear from the above results, the paper feed roll according to the embodiment of the present invention has an appropriate surface roughness, and therefore has a friction coefficient suitable as a paper feed roll.
In addition, the friction coefficient was stable even after long-term use without any decrease due to adhesion of paper powder or the like. Further, the paper feed rolls of these examples did not cause a problem such as paper wrapping due to adhesiveness even in a high temperature and high humidity atmosphere.

[0025]

As described above, the paper feed roll of the present invention has high surface dimensional accuracy, no paper wrapping even in a high temperature and high humidity atmosphere, and no problem of adhesion of paper dust and the like. It has a paper feed characteristic.

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Claims (4)

[Claims] 1. A paper feed roll, characterized in that a resin coat layer having a rough surface is provided on the surface of a metal core roll. 2. The paper feed roll according to claim 1, wherein the surface roughness Rz of the paper feed roll is in the range of 5 to 20 μm. 3. The paper feed roll according to claim 1, wherein the resin coat layer is formed of a resin-based paint. 4. The paper feed roll according to claim 3, wherein the resin coating layer is formed by applying a urethane-based or silicone-based coating material.