CN-122029118-A - Paper feeding roller and paper feeding device

Abstract

The invention provides a paper feeding roller and a paper feeding device capable of maintaining friction coefficient of roller surface and improving durability even in long-time use. The paper feed roller 12 includes a shaft 12a and an elastic layer 12b formed on the outer peripheral surface of the shaft 12a, wherein the elastic layer 12b is made of a rubber composition containing urethane rubber, surface irregularities are formed on the outer peripheral surface of the elastic layer 12b by a plurality of protrusions, the surface roughness Rz of the outer peripheral surface of the elastic layer 12b is 30 μm or more and 280 μm or less, and the contour height when the protrusion surface after 3 ten thousand paper passes in a paper feed test under the following conditions is 2.0 μm or more and 10 μm or less is observed by a microscope. The paper feed roller of the paper feed device 10 is one or both of a paper feed roller and a separation roller. Environment 10 ℃ and 10%RH, printer load 400g, paper feeding speed 300mm/sec.

Inventors

• MATSUDA HIROTOSHI
• Itou Oki
• Miyakawa Shinra
• Zuo Tianxue
• Ming Lezhishu

Assignees

• 住友理工株式会社

Dates

Publication Date

20260512

Application Date

20250204

Priority Date

20240216

Claims (5)

1. 1. A roll for paper feeding, wherein, The paper feed roller comprises a shaft body and an elastomer layer formed on the outer peripheral surface of the shaft body, The elastomer layer is composed of a rubber composition containing urethane rubber, A plurality of convex parts are formed on the outer peripheral surface of the elastic body layer to form surface concave-convex, The surface roughness Rz of the outer peripheral surface of the elastomer layer is 30-280 mu m, The height of the profile of the convex part surface after 3 ten thousand sheets of paper are fed in a paper feeding test under the following conditions is more than 2.0 mu m and less than 10 mu m, Environment is 10 ℃ and 10%RH, The printer was loaded with 400g and the paper feed speed was 300mm/sec.
2. 2. The paper feed roller according to claim 1, wherein the surface of the elastomer layer has A JIS-A hardness of 30 degrees or more and 60 degrees or less.
3. 3. The paper feed roller according to claim 1 or 2, wherein isocyanate of the urethane rubber constituting the elastomer layer is diphenylmethane diisocyanate or toluene diisocyanate.
4. 4. The paper feed roller according to any one of claims 1 to 3, wherein the paper feed roller is one or both of a paper feed roller and a separation roller.
5. 5. A paper feeding device, wherein the paper feeding roller according to any one of claims 1 to 3 is one or both of a paper feeding roller and a separation roller.

Description

Paper feeding roller and paper feeding device Technical Field The present invention relates to a paper feed roller and a paper feed device suitable for electrophotographic apparatuses such as copiers, printers, and facsimile machines using electrophotography. Background Electrophotographic apparatuses such as copiers, printers, and facsimile machines using electrophotography are provided with a paper feeding device. The paper feeding device includes a feed roller (pickup roller) for feeding out the paper in the paper feeding cassette, a paper feeding roller (feed roller) for conveying the fed-out paper, and a separation roller (retard roller). For example, patent document 1 describes that, in a paper feed roller, a texture pattern having a surface roughness Ra of 10 μm to 150 μm is formed on the roller surface so that the hardness is in the range of 10 ° to 30 ° on the shore a scale. Patent document 2 describes a paper feeding device having a friction separation roller type separation paper feeding portion formed of a pair of rollers, wherein the surface roughness of the surface of the separation roller is made much thicker than the surface roughness of the surface of the feed roller, the surface roughness of the surface of the feed roller is set to 5 μm or more and 30 μm or less in terms of ten-point average roughness (Rz), and the surface roughness of the surface of the separation roller is set to 40 μm or more in terms of ten-point average roughness (Rz). Prior art literature Patent literature Patent document 1, japanese patent laid-open No. 09-156784; patent document 2 Japanese patent application laid-open No. 2004-277025. Disclosure of Invention Problems to be solved by the invention These paper feed rollers convey paper while maintaining friction with the paper due to the tackiness of the rubber. The paper feed roller needs to continuously maintain the paper transport function for a required service life. In the case where the roller surface is formed of urethane rubber, since the urethane rubber is less likely to wear and surface irregularities can be maintained, durability is excellent. However, when paper is fed for a long period of time, paper dust adheres to the convex portions of the surface irregularities of the roller, and even if the surface irregularities are maintained, the friction coefficient may not be maintained. The invention provides a paper feeding roller and a paper feeding device capable of maintaining friction coefficient of roller surface and improving durability even if used for a long time. Means for solving the problems The present inventors have intensively studied, and as a result, have conceived to realize a long life by actively wearing a part of the roller surface of urethane rubber. Then, the convex surface of the roller of urethane rubber is locally worn by friction force during use, so that fine concave portions are formed on the convex surface, and paper dust is deposited in the concave portions, thereby maintaining the friction coefficient. Specifically, the roll for paper feeding according to the present invention is characterized by comprising a shaft body and an elastomer layer formed on the outer peripheral surface of the shaft body, wherein the elastomer layer is composed of a rubber composition containing urethane rubber, surface irregularities are formed on the outer peripheral surface of the elastomer layer by a plurality of protrusions, the surface roughness Rz of the outer peripheral surface of the elastomer layer is 30 [ mu ] m or more and 280 [ mu ] m or less, and the profile height when the protrusion surface after 3 ten thousand paper passes in a paper feed test under the following conditions is observed by a microscope is 2.0 [ mu ] m or more and 10 [ mu ] m or less. Environment 10 ℃ 10% RH Printer with load of 400g and paper feeding speed of 300mm/sec The JIS-A hardness of the surface of the elastomer layer is preferably 30 to 60 degrees. The isocyanate of the urethane rubber constituting the elastomer layer is preferably diphenylmethane diisocyanate or toluene diisocyanate. The paper feed roller according to the present invention is preferably one or both of a paper feed roller and a separation roller. The main point of the paper feeding device according to the present invention is that the paper feeding roller is one or both of a paper feeding roller and a separation roller. (1) The main point of the roll for paper feeding according to the present invention is that the roll for paper feeding comprises a shaft body and an elastomer layer formed on the outer peripheral surface of the shaft body, wherein the elastomer layer is composed of a rubber composition containing urethane rubber, surface irregularities are formed on the outer peripheral surface of the elastomer layer by a plurality of protrusions, the surface roughness Rz of the outer peripheral surface of the elastomer layer is 30 [ mu ] m or more and 280 [ mu ] m or less, and the contour heigh