JP3000760U - Drive roller for copiers, etc. - Google Patents

Abstract

(57) [Summary] [Purpose] Instead of the conventional rubber injection method, it can be manufactured by the spray coating method, the number of defective products is extremely small, the surface polishing process is not required, and the accuracy is easy to obtain. To develop a driving roller for copiers, etc. that can obtain stable friction coefficient due to surface roughness without change and can be manufactured efficiently and economically. [Structure] A resin coating layer having a thickness of 50 to 150 µ is formed on the outer periphery of a metal core rod, and the resin coating layer is in a foamed state by bubble cells having a diameter of 5 to 50 µ and its surface It is assumed that the roughness is formed in the range of 5 to 60 μ.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a driving roller used in a copying machine or the like.

[0002]

[Prior art]

 Inside the copying machine, there is a drive roller for rotating a belt such as a photosensitive belt. In other words, it is necessary to rotate the photoconductor belt at the same time when the copy paper is loaded to attract and print the toner, and the drive roller is installed to drive the photoconductor belt.

This drive roller is required to rotate the photosensitive belt accurately, and is required to have high accuracy. In the past, not only the accuracy of the roller such as the outer diameter, but also the friction coefficient and hardness were kept within the standards, and flaws due to the inclusion of air bubbles or foreign matter were never allowed.

Conventionally, this type of driving roller is made by injecting a rubber such as chloroprene rubber into the outer periphery of an aluminum (muk rod) shaft (clicker) which is a base material by a mold injection molding method to cure the rubber. Then, the outer form was removed, and then the product was manufactured by the method of centering by cutting and polishing while rotating.

In the conventional manufacturing method as described above, bubbles and foreign substances are likely to enter during rubber injection, and many defective products are generated. Further, since rubber has uneven hardness, advanced polishing technology is required, and further long time is required. There were many problems, such as the precision being lost if left unattended and the number of steps being large and the cost being disadvantageous.

[0006]

[Problems to be solved by the device]

 The present invention has been made for the purpose of solving the above-mentioned problems, and it has extremely few defective products, does not require a surface polishing step, does not change with time, and is efficient and economical. It aims to provide a new drive roller for a copying machine or the like that can be manufactured in a general manner.

[0007]

[Means for Solving the Problems]

 As a result of diligent research to achieve the above-mentioned object, in the past, the only goal was to eliminate surface irregularities by polishing in order to improve the friction coefficient due to adhesion, but in the present invention, the idea of reversal was reversed. We tried to obtain the coefficient of friction by the surface roughness by providing appropriate unevenness on the surface by using the method, and it was extremely difficult to form a foamed resin film layer by bubbles on the outer circumference of the metal core rod set under the specified conditions. We have found that excellent results can be obtained.

That is, according to the present invention, a resin coating layer having a thickness of 50 to 150 μ is formed on the outer periphery of a metal core rod, and the resin coating layer is foamed by a bubble cell having a diameter of 5 to 50 μ. The present invention is directed to a driving roller of a copying machine or the like which is in a state and has a surface roughness in the range of 5 to 60 μ.

The present invention will be described in detail with reference to the drawings and embodiments. FIG. 1 is an enlarged sectional view of the roller of the present invention. As shown in this figure, the present invention has a resin coating layer (2) formed on the outer periphery of a metal core rod (1). In the drawings, the metal core rod (1) is shown as a pipe, but it is needless to say that it may be a pipe or a perfect rod.

FIG. 2 is a partially enlarged sectional view showing the surface layer portion of the roller of the present invention in a further enlarged manner. As shown in this figure, the resin film layer (2) contains a large number of bubble cells (3) and is in a foamed state in which small irregularities are formed on the surface.

It is necessary that the surface roughness, which is represented by the difference between the unevenness of the surface, that is, the difference between the height of the valley and the height of the surface, is 5 to 60 μm. If the surface roughness is less than 5μ, the friction coefficient is low and slippage tends to occur, making it unsuitable as a drive roller. On the other hand, if the surface roughness exceeds 60μ, the accuracy of the roller falls outside the allowable range. Of.

In order to keep the surface roughness in the range of 5 to 60 μ, it is necessary to set the diameter of the bubble cell (3) in the range of 5 to 50 μ. That is, if the diameter of the bubble cell (3) is less than 5 μ, the surface roughness does not reach 5 μ, while if the diameter exceeds 50 μ, the surface roughness exceeds 60 μ.

Further, the thickness of the resin coating layer (2) in the present invention can be appropriately set according to the purpose, but when the thickness is less than 50 μ, the amount of resin forming the resin coating layer (2) is insufficient. As a result, it becomes difficult to control the surface roughness described above, and on the other hand, if the thickness of the resin film layer (2) exceeds 150 μ, the cushioning property due to foaming becomes excessive and the accuracy of the roller falls outside the allowable range. . Therefore, it is appropriate that the thickness of the resin film layer (2) is in the range of 50 to 150 μm.

As a method of manufacturing the roller of the present invention, an emulsion type resin mixed with a foaming agent or a cross-linking agent is uniformly coated on the outer circumference of the metal core rod (1) by a spray method and dried to remove water. Most preferable is a means for performing heat-foam hardening treatment. Examples of the resin include urethane type, acrylic type, synthetic rubber type such as chloroprene, and the like, and urethane type or acrylic type is particularly preferable.

For example, a polyurethane emulsion having a solid content of 40% is spray-coated with an emulsion having a viscosity of 700 cps (room temperature) prepared by mixing 5% of a diazo compound-based foaming agent and 3% of an epoxy-based crosslinking agent. For example, in a spray gun that moves in parallel with the axis of the metal core rod (1) while rotating the metal core rod (1) of aluminum pipe with a diameter of 16.05 mm, which has been precisely machined by polishing. Therefore, it is better to carry out spray coating.

The spray gun discharge amount (for example, 100 to 200 g / min) or the moving speed may be adjusted to adjust the coating amount. For example, the above-mentioned emulsion is coated by wet to a thickness of 175 μ. When it is dried at 80 ° C. for 10 minutes, its thickness becomes 70 μm, and when it is further heat-treated at 150 ° C. for 10 minutes, the foaming agent foams to form a foamed resin film layer (2) having a thickness of about 100 μm. Of.

As described above, the roller of the present invention polishes the metal core rod (1), which is easy to cut and grind as described above, to obtain accuracy, and to apply a uniform coating on it, so that it is easy to ensure accuracy, and the spray Since the resin is applied uniformly by the method and then the bubble cells (3) having a predetermined size are formed by foaming, the surface roughness is easily uniform over the entire circumference.

[0018]

[Effect of device]

 The effects of the present invention are listed below as a list of items. (A) The probability of defective products is extremely low, unlike the conventional rubber injection method. (B) Since the metal core rod, which is easy to polish, is polished to obtain accuracy and then a uniform resin film layer is formed on the outer periphery thereof, the accuracy can be easily obtained. (C) The resin film layer does not need to be polished and does not require a high-level polishing technique.

(D) Since the coefficient of friction is increased by the predetermined surface roughness, that is, the uniform surface unevenness, this coefficient of friction can be maintained for a long period of time. (If the coefficient of friction is obtained by tack, the coefficient of friction immediately decreases due to the adhesion of dust etc. and it becomes slippery.) (E) There is no secular change as in the past and the accuracy can be maintained for a long time. . (F) The manufacturing process and time are reduced, mass production is possible, efficiency is improved, and it is economically advantageous. As described above, the present invention exhibits various excellent effects and exhibits extremely high usefulness as a driving roller for a copying machine or the like.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a roller of the present invention.

FIG. 2 is a partially enlarged sectional view showing a surface layer portion of FIG. 1 in a further enlarged manner.

[Explanation of symbols]

 (1) Metal core rod (2) Resin coating layer (3) Bubble cell

Claims (1)

[Scope of utility model registration request] 1. A metal core rod having a thickness of 50 to 150 on the outer periphery thereof.
a resin film layer having a diameter of 5 to 50 μm, and the surface roughness thereof is in the range of 5 to 60 μm. Characteristic drive roller for copiers, etc.