JPH01256438A - High friction resistance member - Google Patents

Abstract

PURPOSE:To obtain a high friction resistance member suitable for use necessary for high friction resistance by constituting the member coating a base body in its contact surface, coming into contact with at least a contact object, with silicone rubber. CONSTITUTION:Rotary shafts 1, 1, consisting of metal and synthetic resin or the like, are mounted to both end central parts of a roller main unit 2 composed of rubber, synthetic resin, metal, etc., and a paper feed roller for use of a paper feeder is constituted coating the roller main unit 2 in its peripheral surface with silicone rubber 3. As the result, a contact surface increases its friction resistance enabling a contact object to be surely held and brought into firm contact with no slip on the contact surface. While the contact surface, because its adhesive force decreases, prevents the contact object from adhering, easily separating it from the contact surface while preventing even an impurity of dust or the like from easily adhering to the contact surface, and its friction resistance is also prevented from easily generating the decrease by the impurity adhering. The silicone rubber 3 has a weak point, for instance, low strength and easy deformation by external force or the like, and these weak points can be covered by the base unit 2 in its strength.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is applicable to contact objects such as paper feed rollers, paper feed belts, paper trays, etc. of paper feed devices in copying machines, facsimile machines, printers, etc. The present invention relates to a high frictional resistance member suitable for use in applications requiring high frictional resistance on contact surfaces.

[Conventional technology]

In recent years, there has been an increasing need for paper feeding devices that can accurately feed paper in various fields. For example, a copy machine,
In office equipment such as facsimile machines and printers, it is necessary to accurately feed original paper or paper sheet by sheet (the same applies in this case, although the sheets may be continuous). Additionally, devices that stack base papers and automatically feed them one by one are becoming popular, and in this case too, paper feeding is an important part. Furthermore,
Accurate paper feeding is of course important in machines that handle banknotes, such as vending machines and automatic deposit/pay machines.

In the above-mentioned paper feeding device, the performance of the paper feeding roller, paper feeding belt, and paper tray is important, and the greater the frictional resistance of the surfaces that come into contact with the paper, such as these rollers, the better for accurate paper feeding. is preferable. For this reason, in conventional rollers and the like, the contact surface is formed of various types of rubber or synthetic resin in order to increase the frictional resistance of the contact surface with paper.

[Problem to be solved by the invention]

However, conventional paper feed rollers and paper feed belts made of rubber or synthetic resin do not have sufficient frictional resistance on the surfaces that come into contact with the paper, and may not be able to accurately feed the paper. In addition, several sheets of paper may be fed at the same time, but this phenomenon occurs noticeably when there are few sheets of paper remaining on the second paper tray, and the main reason for this is that the paper on the bottom The reason is that the frictional resistance with the paper tray is low. Furthermore, the surfaces of conventional paper feed rollers, belts, and paper trays that come into contact with the paper are made of rubber or synthetic resin, so they have relatively strong adhesive properties, which causes the paper feed to stick to the contact surfaces. Sometimes the paper remains stuck, causing trouble, and dust and paper dust adheres to the contact surface, reducing frictional resistance, and these deposits sometimes stain the paper.

The present invention was developed in view of the above circumstances, and since the frictional resistance of the contact surface that comes into contact with the contact object is high and the adhesive force of the contact surface is low, it is difficult for deposits to adhere to the contact surface. It is an object of the present invention to provide a high frictional resistance member that can be suitably used in applications requiring high frictional resistance, such as paper feeding rollers, paper feeding belts, and paper trays of devices.

[Means and effects for solving the problem] In order to achieve the above object, the present inventor coated at least the contact surface of the base body that comes into contact with the contact object with silicone rubber.

In this case, the type, shape, etc. of the substrate to be coated with silicone rubber are appropriately selected depending on the use of the member of the present invention.
There are no particular limitations, and all kinds of base materials can be used, such as metal, cloth, various rubbers, and synthetic resins.

The type of silicone rubber is also not limited, but it is preferable to use a silicone rubber that can be coated with low viscosity and cures at a relatively low temperature (approximately 150"C or less) without damaging the substrate. Particularly room temperature-curable silicone rubber Specifically, it absorbs moisture, dealcoholization, deoximation,
One-component products that cure through condensation reactions such as deacetic acid and deamine, metal organic acid salts, organic amines, quaternary ammonium, and phosphonium compounds. Two-component types that harden through a condensation reaction such as dehydroxylamine, and two-part types that harden through an addition reaction using palladium or platinum as a catalyst can be suitably used.

The hardness of the silicone rubber, the coating thickness, the tensile strength and tear strength of the coating film, etc. are determined as appropriate depending on the intended use of the member of the present invention.

For example, when the contact object is paper, such as the paper feed roller of a paper feed device, a belt, a paper tray, etc., the hardness of silicone rubber is preferably 20 to 70 degrees, particularly 30 to 60 degrees according to JIS A. If the angle is softer than 20 degrees, the frictional resistance will be high, but the strength of the coating film may be reduced, and if it is higher than 70 degrees, the frictional resistance may be insufficient. Also, the coating thickness is 0.05~0.5+
@, especially preferably 0.07 to 0.2 mm,
If it is thinner than 0.5 nm, the frictional resistance may be insufficient, and if it is thicker than 0.511F, the frictional resistance may be high, but the film may become brittle or the coating process may become difficult. Tensile strength of coating film
No. 3 tF 20 kg/ak or more, special Ni 30k
g/aJ or more, preferably 20 kg/d
If it is lower, the film may be easily scraped.

Although there is no limitation on the silicone rubber coating method, for example, after pre-treating the coating surface of the substrate for adhesion of the silicone rubber as necessary, applying liquid low-viscosity silicone rubber and spraying = 5- A method of applying the coating material to the coated surface of the base material by misting, dipping, etc. and curing it is preferably employed.

[For production]

In the present invention, by coating the contact surface of the base body that comes into contact with the contact object with silicone rubber, the frictional resistance of the contact surface increases, so that the contact object can firmly contact the contact surface without slipping. I'm sorry. In addition, since the adhesive strength of the contact surface becomes low, the contact object does not stick to the contact surface and easily leaves the contact surface, and it is difficult for foreign objects such as dust to adhere to the contact surface, so foreign objects do not stick to the contact surface. It is also difficult for the frictional resistance of the contact surface to decrease due to adhesion. In this case, the disadvantages of silicone rubber, such as low strength and ease of deformation due to external force, are covered by the strength of the base material, and no practical problems arise.

Next, the present invention will be specifically explained by showing examples with reference to the drawings, but the present invention is not limited to the following examples.

〔Example〕

Fig. 1 shows a 61 paper feed roller for a paper feed device according to an embodiment of the present invention, in which rotary shafts 1, 1 made of metal, synthetic resin, etc. are attached to the center of both ends. , the outer peripheral surface of the roller body (base body) 2 made of metal etc.
The surface that comes into contact with the paper is coated with silicone rubber.

Fig. 2 shows a paper feed belt of a paper feed device according to an embodiment of the present invention, which is made of canvas, steel, etc., and has a core made of rubber, synthetic resin, etc. on one side of a belt-shaped core body 4 that supports the force applied to the belt. A silicone rubber 7 is coated on the surface of the cover 5 (the surface that comes into contact with paper) of the bell 1 to the main body (substrate) 6 on which the body protection cover 5 is laminated. In addition,
The belt body 6 may be formed by integrally forming the core 4 and the cover 5 from the same material.

FIG. 3 shows a paper tray of a paper feeding device according to an embodiment of the present invention, in which the upper surface (surface that comes into contact with paper) of a rectangular substrate (substrate) 8 made of an arbitrary material is coated with silicone rubber 9. It is something.

The members of the examples shown in FIGS. 1 to 3 have high frictional resistance on the contact surface with paper and low adhesive strength, so they are shown in the following ■ to ◎
It has the following excellent effects.

■ The frictional resistance of paper feed rollers and belts is increased, allowing paper to be accurately fed one by one. Continuous paper can also be fed accurately.

■ When stacking papers to be fed on a paper tray, by coating the top surface of the paper tray with silicone rubber, it is possible to reliably feed each sheet one by one until the last one.

◎ Although silicone rubber has high frictional resistance, it has low adhesion, so paper does not easily stick to it, and therefore, after paper feeding, the paper easily separates from rollers, etc., so 1-Rubble is less likely to occur. In addition, there is almost no adhesion of dust or paper powder, and the paper is hard to get dirty, and since there is almost no adhesion, there is little decrease in frictional resistance.

Note that although the above embodiments are configured as a paper feed roller, a paper feed belt, and a paper tray of a paper feed device, the high frictional resistance member of the present invention can be configured as any member used in applications requiring high frictional resistance. It's something you get.

〔Effect of the invention〕

As explained above, the high frictional resistance member of the present invention achieves the effects shown in the following ■ to ■ by coating the surface of the base body that comes into contact with the contact object with silicone rubber, and requires high frictional resistance. It is effectively used in applications, particularly as a paper feed roller of a paper feed device in office equipment, a paper feed belt, a paper tray, etc.

■ Since the frictional resistance of the contact surface between the contact object and the contact object is high, when an external force is applied to the contact object toward the contact surface, the contact object and the contact surface contact firmly without slipping, and therefore the contact object Reliably held.

■ Since the adhesive force of the contact surface is low, it is difficult for contact objects and other foreign substances to adhere to the contact surface. Therefore, when the external force is released, the contact object easily separates from the contact surface, and the contact object is easily removed from the contact surface by foreign objects. Objects do not get dirty, and the frictional resistance of the contact surface is less likely to decrease due to the adhesion of foreign substances.

■ Silicone rubber generally has relatively low strength, is easily broken, and is also highly deformed by external forces, but in the present invention, silicone rubber is coated on the contact surface of the base material that comes into contact with the contact object, so the base material The above-mentioned drawbacks of silicone rubber are covered by the strength of silicone rubber, and these drawbacks no longer pose a problem in practice.

■ Only a small amount of expensive silicone rubber is used, so
It is advantageous in terms of cost.

Hereinafter, the effects of the present invention will be specifically illustrated by experimental examples.

[Experiment/Example]

Comparative products 1- No. 4 licking belt was manufactured.

Thermoplastic polyurethane (comparison product 1): Caprolactam thermoplastic polyurethane polyvinyl chloride (comparison product 2): DOP blended soft polyvinyl chloride SBR vulcanized rubber (comparison amount 3): SBR, carbon black, softener and vulcanizing agent NBR vulcanized rubber (comparative amount 4): Comparative amount 1 containing NBR, carbon black, a softener, a vulcanizing agent, etc.; Comparative amount 1 above. A two-component silicone rubber (manufactured by Toray Silicone Co., Ltd., 5E) that cures by an addition reaction with a JIS A hardness of 55 degrees is applied to the thermoplastic polyurethane sheet of the belt.
L701) was applied and cured by heating at 120°C for 30 minutes to form product 1 (silicone rubber film thickness 0.1
5 mm) and Invention Product 2 (same film thickness: 0.08 mm) paper feeding belts were respectively produced.

Next, the frictional resistance and adhesion of the surfaces of the paper feed belts of the present invention and comparative quantities that come into contact with paper (the silicone rubber surface for the present invention products, and the polyurethane, polyvinyl chloride, or rubber surface for the comparative quantities) were measured. .

As shown in Figure 4, according to ASTM D1894, a paper (55 kg high-quality paper for PPC) C is applied to the contact surface of the paper feed belt a by a weight d under a load W (4.96 g / ci
), and the coefficient of dynamic friction when the belt a is moved at a speed V (2 m/mj, n) by applying an external force F is determined as Kl'l by the load cell C.

Note that f is a connection body that connects the weight d and the load cell e. Further, as shown in FIG. 5, paper (same as above) C was brought into contact with the bell I"a in the same manner as above, and the static friction coefficient was measured by tilting the belt a. The results are shown in Table 1.

Table 1 From the results shown in Table 1, it is recognized that the frictional resistance of the bell 1 coated with silicone rubber is much higher than that of the bell 1 without coating. It has also been found that the thicker the silicone rubber coating, the higher the frictional resistance.

The force required to peel off an adhesive tape with a width of 25 mm by pressing it onto the contact surface of the belt and then pulling the tape at a speed of 300 mm/min in a direction perpendicular to the belt. was measured and taken as the adhesive strength. Second result
Shown in the table.

Table 2 From the results shown in Table 2, it is recognized that the contact surface of the belt of the present invention has very low tackiness. Therefore, it has been found that the belt of the present invention has less adhesion of foreign substances such as paper dust and dirt, and the surface is less likely to become soiled, so that the conveyed paper is less likely to become soiled, and high frictional resistance is maintained for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a paper feed roller according to an embodiment of the present invention, FIG. 2 is a sectional view showing a paper feed belt according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a schematic diagram showing a dynamic frictional resistance measuring means in an experimental example, and FIG. 5 is a schematic diagram showing a static frictional resistance measuring means in an experimental example. 2.6.8...Substrate, 3.7.9...Silicone rubber coating layer. Applicant Brideston Co., Ltd. Agent Patent Attorney Takashi Kojima A W

Claims (1)

[Claims] 1. A high frictional resistance member, characterized in that at least the contact surface of the base that comes into contact with a contact object is coated with silicone rubber.