JPH11208921A - Printer paper feed roller and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a printer paper feed roller with a high friction coefficient easily with high accuracy. SOLUTION: A surface of a high rigidity metal bar 11 is coated with ultraviolet curing resin or an electron beam curing resin film 12 with high hardness fine-grain previously dispersed, and hardened. A film layer may be patterned, and the surface of the high rigidity metal bar 11 may be covered with a thermally shrinking tube or the like with high hardness fine-grain previously dispersed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to plain paper, coated paper,
The present invention relates to a transport device of a printer for printing on a printing sheet such as an OHP (overhead projector) sheet, glossy paper, glossy film, and the like, and more particularly, to a paper feed roller and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, extremely fine printing equivalent to photographic quality has been realized by an ink jet printer. Conventionally, in a printer of the ink jet system, a metal rod coated with rubber has been used for a paper feed roller which is a part of the sheet conveying device. On the other hand, for printers that have realized photographic quality in recent years, paper feed rollers that have a coating with a high friction coefficient formed on a cylindrical high-rigidity metal rod have been used to meet the demand for even higher paper feed accuracy. I have. The most common one is a metal rod coated with a paint in which ceramic particles are dispersed.

[0003]

However, the conventional manufacturing method has the following problems.

[0004] It is difficult to produce a coating while maintaining a constant coating thickness between products, because coating thickness unevenness tends to occur during coating. In particular, it has been difficult to accurately manufacture a long-axis paper feed roller.

[0005] The necessity of discharging a paint containing ceramic fine particles at a high pressure necessitates abrasion of a spray nozzle used for the coating, which makes it difficult to maintain and manage the product quality at a constant level.

[0006] In the coating method, only a very small part of the paint used is applied to the object to be coated, and the other must be collected and discarded, which is a very inefficient manufacturing method.

On the other hand, in the coating method, ceramic particles having a primary particle diameter of usually 70 μm or less are appropriately dispersed in a paint by stirring or the like, and a coating film containing the particles can be formed at a constant density after discharge. However, it is difficult to form a coating film having a large coefficient of friction that contributes to paper feeding accuracy.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a paper feed roller having a large friction coefficient which contributes to paper feed accuracy, and to efficiently manufacture the paper while maintaining a constant quality. It is to provide a way to do it.

[0009]

In order to achieve the above object, a printer paper feed roller according to claim 1 includes fine particles of high hardness at a constant density in a film and has irregularities on the surface by the fine particles. It is characterized in that a column-shaped high-rigidity metal rod is covered by a single layer with an ultraviolet-curable resin film or an electron beam-curable resin film.

According to a second aspect of the present invention, there is provided a printer paper feed roller according to the first aspect, wherein the ultraviolet curable resin film layer is formed on a surface of a cylindrical high rigid metal rod having a predetermined pattern.

A method of manufacturing a printer paper feed roller according to claim 3, wherein the film contains high-hardness fine particles at a constant density in the film, and the surface is made uneven by the fine particles. 5. The method according to claim 4, further comprising a first step of coating the columnar high-rigidity metal rod with a single layer, and a second step of curing the resin film by irradiating ultraviolet rays or electron beams.
The method for manufacturing a printer paper feed roller according to the first aspect includes a step of coating a cylindrical high-rigidity metal rod with a UV-sensitive resin having fine particles of high hardness at a constant density in a film and having irregularities on the surface by the fine particles. A step of irradiating ultraviolet rays through a photomask having a predetermined pattern, and a third step of forming a predetermined pattern of the ultraviolet-sensitive resin layer using a developing process. .

[0012] The printer paper feed roller according to the fifth aspect is a heat-shrinkable resin tube or an electron beam-curable resin tube which contains high-hardness fine particles at a constant density and has an uneven surface due to the fine particles. It is characterized by being coated with a metal rod.

According to a sixth aspect of the present invention, there is provided a method for manufacturing a printer paper feed roller, wherein the tube having a predetermined length having an inner diameter larger than the outer diameter of the cylindrical high-rigidity metal rod is passed through the cylindrical high-rigidity metal rod. The method is characterized by including a first step and a second step of heating or irradiating an electron beam.

According to a seventh aspect of the present invention, there is provided the printer paper feed roller according to the first, second or fifth aspect, wherein the average primary particle diameter of the high hardness fine particles is selected from a range of 20 to 500 μm. It has a particle diameter, and the resin layer thickness is 40% of the average primary particle diameter of the particles.
When the high-rigidity metal rod having a thickness of 90% or less and a high-rigidity metal rod is cut at an arbitrary portion of the resin-coated portion in the normal direction, the high-hardness fine particles per 1 cm length on the outer periphery of the cut surface are It is characterized by including at least one or more.

According to an eighth aspect of the present invention, there is provided the printer paper feed roller according to the first, second or fifth aspect, wherein the high hardness fine particles are selected from metal fine particles and ceramic fine particles.

According to a ninth aspect of the present invention, there is provided a method of manufacturing a printer paper feed roller according to the third, fourth or sixth aspect, wherein the average primary particle diameter of the high hardness fine particles is in the range of 20 to 500 μm. It has a selected average primary particle diameter, the resin layer thickness is 40% or more and 90% or less of the average primary particle diameter of the particles, and a high-rigidity metal rod is applied to any part of the resin-coated portion. 1cm length on the outer circumference of the cut surface when cut in the normal direction
At least one fine particle having high hardness is included per hit.

According to a tenth aspect of the present invention, there is provided a method of manufacturing a printer paper feed roller according to the third, fourth or sixth aspect, wherein the high hardness fine particles are selected from metal fine particles or ceramic fine particles. And

[0018]

The long-axis metal rod can be coated without causing unevenness in the film thickness, since the film is simply coated with a film having a predetermined thickness.

Unlike the coating method, large high-hardness particles can be mixed into the film, so that a film surface having a large friction coefficient required for improving paper feeding accuracy can be obtained.

There is a concern in production that a seam is formed when the film is coated and the coating film thickness becomes non-uniform. However, by patterning the film into a predetermined pattern, a seam is intentionally formed on the entire film layer. Can be overcome. On the other hand, it is also possible to prevent the occurrence of a seam by forming a seamless tube in advance with a film, coating the tube with a metal rod, and then heat shrinking or curing with an electron beam.

By setting the thickness of the film to 40% or more and 90% or less of the average primary particle diameter of the particles of high hardness, the particles are reliably retained in the film with high strength, and the reliability for long-term use is also high. Can be secured.

Since the film thickness is 40% or more and 90% or less of the average primary particle diameter of the particles, a large friction coefficient is obtained because a part of the particles is always exposed on the film surface.

Unlike coating, the selection range of applicable high-hardness particle diameters is widened, so that large particles having an average primary particle diameter of 70 μm or more can be applied. As a result, a large coefficient of friction is obtained.

According to empirical rules, the mixing density of the particles is such that when a high-rigidity metal rod is cut at an arbitrary portion of the resin-coated portion in the normal direction, at least one particle per 1 cm length on the outer periphery of the cut surface is obtained. It is preferable to include the above. If you meet this requirement, you will get the required coefficient of friction

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

(Example 1) As a high rigidity metal rod, FIG.
A cylindrical metal rod 11 having a diameter of 12 mm and a length of 300 mm as shown in FIG. The metal rod was made of iron, and used was one having a sufficient cylindricity as a printer paper feed roller. The surface is plated with nickel to a thickness of 10 μm to prevent rust.

Alumina fine particles having an average particle diameter of 100 μm were previously dispersed in an ultraviolet-sensitive resin and processed into a sheet. The sheet 12 has a thickness of 40 μm and has a structure in which the alumina particles are exposed in a protruding manner on the surface. A small amount of an ultraviolet curable adhesive is applied to the back surface of the sheet.

This sheet 12 was coated on the surface of a metal bar as shown in FIG. FIG. 1c schematically shows a sectional view thereof. Ultraviolet rays were uniformly applied to the entire surface of 1000 mJ. The printer paper feed roller of the present invention was manufactured as described above.

A friction coefficient test was carried out using the product and plain paper, and a coefficient of friction of 0.9 was obtained.

In addition, ten other test articles were prepared in the same manner and subjected to a friction coefficient test. Table 1 shows the results. Prototypes Nos. 1 and 8 were found to be desulfurized in the friction coefficient test and were not applicable. On the other hand, it was found that the prototypes Nos. 5 and 7 were not applicable because the friction coefficient was 0.7 or less, which is the applicable limit. Also,
It was found that the prototype 11 was not applicable, although the coefficient of friction was not a problem, but a streak was formed on the used plain paper.

With respect to other prototypes, good characteristics were obtained, and the effect of the present invention was confirmed.

By cutting a prototype having good characteristics and observing the cut surface of the cylindrical surface, it was schematically found that the structure was as shown in FIG. It was found that at least one alumina fine particle 21 was contained per 1 cm length on the outer periphery of the cut surface.

[0033]

[Table 1]

Comparative Example 1 Prototype Nos. 2 and 1 of Example 1
0, but the dispersion amount of alumina in the used ultraviolet curable resin was reduced to one half. When a friction coefficient test was performed, the friction coefficient was 0.5 or less in all cases. When these were cut and the cut surfaces were observed, it was found that there was one or no alumina fine particles per 1 cm length on the outer circumference of the cut surfaces, and it was found that this structure was the cause of the low friction coefficient.

(Example 2) A prototype similar to that shown in Table 1 of Example 1 was produced using an ultraviolet-curable resin.

However, when curing the resin, an electron beam of 20 Mrad was used without using ultraviolet rays. The resin was cured and the same effect was obtained.

(Example 3) Using the electron beam-curable resin, prototypes similar to the inner prototypes 2 and 10 shown in Table 1 of Example 1 were produced. The resin was cured by the irradiation amount of ultraviolet rays of 20 Mrad, and the same effect was obtained.

Example 4 As a highly rigid metal rod, FIG.
A cylindrical metal rod 31 having a diameter of 12 mm and a length of 400 mm as shown in FIG. The metal rod 31 was made of iron and used as a printer paper feed roller having sufficient cylindricity. The surface is plated with nickel to a thickness of 10 μm to prevent rust.

Alumina fine particles having an average particle diameter of 100 μm were previously dispersed in an ultraviolet-sensitive resin and processed into a sheet. The sheet 32 has a thickness of 40 μm, and has a structure in which the alumina particles are exposed in a protruding manner on the surface. A small amount of an ultraviolet curable adhesive is applied to the back surface of the sheet.

As shown in FIG. 3B, the sheet 32 is
1 was coated. Subsequently, the metal bar is placed under a photomask 33 having a predetermined pattern as shown in FIG. 3C, and is irradiated with ultraviolet light at 1000 mJ while slowly and once intermittently repeating irradiation and non-irradiation of ultraviolet light. did. Subsequently, it was immersed in a developer and developed. As a result of the development, a resin pattern 34 having a square of 300 μm was formed at a pattern gap of 100 μm. This cross-sectional state is schematically shown in FIG. The same coefficient of friction as in Example 1 was obtained.

On the other hand, in the first embodiment, the seam of the sheet rarely becomes large due to the variation in manufacturing conditions, and there is a concern that the precision in paper feeding may be reduced. It has been found that the above-mentioned problem caused by the condition variation can be avoided.

In this embodiment, the ultraviolet exposure was performed after the resin sheet was coated. However, the same effect can be obtained by exposing the sheet before coating and then curing the coating. Further, heating after forming a predetermined resin pattern is also effective in improving the adhesion of the sheet to the metal rod.

Example 5 A thickness of 300 μm and a length of 40 in which silicon carbide fine particles having an average particle diameter of 200 μm were mixed and dispersed.
A tube made of 0 mm fluororesin was prepared. This tube has an inner diameter of 12 mm and has heat shrinkability. The tube was manufactured so that all the silicon carbide fine particles were exposed on the surface on the outer diameter of the tube.

An iron metal rod having a surface of 11.8 mm in diameter and 450 mm in length and nickel-plated was prepared and covered with the heat-shrinkable tube. Subsequently, heat shrink was performed by heating at 200 ° C. for 10 minutes, and the heat-shrinkable tube was sufficiently adhered to the metal rod. The printer paper feed roller of the present invention was manufactured as described above.

A friction coefficient test was performed in the same manner as in Example 1. As a result, a friction coefficient of 0.9 was obtained, and it was confirmed that the friction roller was applicable as a highly accurate printer paper feed roller.

Example 6 The same as Example 5, but using silicon oxide as the fine particles of high hardness.

A friction coefficient test was performed in the same manner as in Example 1. As a result, a friction coefficient of 0.9 was obtained, and it was confirmed that the friction roller was applicable as a highly accurate printer paper feed roller.

Example 7 The same as Example 5, except that the heat-shrinkable tube had a thickness of 400 μm and an average particle diameter of alumina of 500 μm.

A friction coefficient test was performed in the same manner as in Example 1. As a result, a friction coefficient of 0.8 was obtained, and it was confirmed that the friction roller was applicable as a highly accurate printer paper feed roller.

Example 8 Same as Example 5, except that an electron beam-curable resin tube was used instead of the heat-shrinkable tube. As a curing method, an electron beam of 20 Mrad was applied.

A friction coefficient test was performed in the same manner as in Example 1. As a result, a friction coefficient of 0.9 was obtained, and it was confirmed that the friction roller was applicable as a highly accurate printer paper feed roller.

[0052]

As described above, according to the printer paper feed roller and the method of manufacturing the same according to the present invention, a printer paper feed roller having a large and appropriate friction coefficient which contributes to the paper feed accuracy can be obtained, while maintaining high quality. It can be manufactured repeatedly and efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing one embodiment of the present invention.

FIG. 2 is a diagram schematically showing a part of a cross section of one embodiment of the present invention.

FIG. 3 is a diagram schematically showing one embodiment of the present invention.

[Explanation of symbols]

 11. High rigidity metal rod 12. Sheet (resin film layer) 21. Cross section of alumina fine particles 22. 23. Sheet (resin film layer) cross section Cross section of highly rigid metal rod 31. High rigidity metal rod 32. Sheet (resin film layer) 33. Photo mask 34. Resin pattern

Claims (10)

[Claims] An ultraviolet-curable resin film or an electron-beam-curable resin film containing high-hardness fine particles at a constant density in a film and having irregularities on the surface by the fine particles, and a single cylindrical high-rigidity metal rod. A printer paper feed roller characterized by being coated on a sheet. 2. The printer paper feed roller according to claim 1, wherein the ultraviolet curable resin film layer is formed on the surface of a cylindrical high rigid metal rod with a predetermined pattern. 3. A single column of a highly rigid metal rod made of an ultraviolet-sensitive resin film or an electron beam-curable resin film containing fine particles of high hardness at a constant density in a film and having a surface with irregularities by the fine particles. And a second step of curing the resin film by irradiating the resin film with an ultraviolet ray or an electron beam. 4. A cylindrical high-rigidity metal rod is coated with a single layer of a UV-sensitive resin which contains fine particles of high hardness at a constant density in a film and has a surface irregularity by the fine particles.
Printer paper feeding, comprising: a second step of irradiating ultraviolet rays through a mask having a predetermined pattern; and a third step of forming a predetermined pattern of the ultraviolet-sensitive resin layer using a developing process. Roller manufacturing method. 5. A cylindrical high-rigidity metal rod is coated with a heat-shrinkable resin tube or an electron beam-curable resin tube containing high-hardness fine particles at a constant density and having irregularities on the surface by the fine particles. And printer paper feed roller. 6. A heat-shrinkable metal rod having a larger inner diameter than the outer diameter of a cylindrical rigid metal rod, having a predetermined length, and containing high-hardness fine particles at a constant density and having a surface with the fine particles. A first step of passing a conductive resin tube or an electron beam-curable resin tube through a cylindrical high-rigidity metal rod, and a second step of heating or irradiating an electron beam. . 7. The high-hardness fine particles have a constant average primary particle diameter selected from the range of 20 to 500 μm, and the resin layer thickness is 40% of the average primary particle diameter of said particles.
When the high-rigidity metal rod has a thickness of not less than 90% and is cut in a normal direction at an arbitrary portion of the resin-coated portion, the high-hardness fine particles are at least per 1 cm length on the outer periphery of the cut surface. 6. The printer paper feed roller according to claim 1, wherein one or more printer paper feed rollers are included. 8. The high-hardness fine particles are selected from metal fine particles and ceramic fine particles.
Or the printer paper feed roller according to 5. 9. The high-hardness fine particles have a constant average primary particle diameter selected from the range of 20 to 500 μm, and the resin layer thickness is 40% of the average primary particle diameter of said particles.
When the high-rigidity metal rod has a thickness of not less than 90% and is cut in a normal direction at an arbitrary portion of the resin-coated portion, the high-hardness fine particles are at least per 1 cm length on the outer periphery of the cut surface. The method for manufacturing a printer paper feed roller according to claim 3, wherein one or more printer paper feed rollers are included. 10. The method according to claim 3, wherein the fine particles having high hardness are selected from metal fine particles and ceramic fine particles.
7. The method for manufacturing a printer paper feed roller according to 4 or 6.