Paper feeding roller
阅读说明:本技术 送纸辊 (Paper feeding roller ) 是由 山口和志 于 2019-04-15 设计创作,主要内容包括:本发明提供一种长期抑制纸张的输送不良的送纸辊。送纸辊10具备轴体12和形成于轴体12的外周的弹性体层14,在弹性体层14的周面上设置有形成表面凹凸的多个凸部16,以每1cm轴向长度为0.5~2.3N的载荷将玻璃板按压于送纸辊10的周面时的与玻璃面接触的部分整体的接触面积为与玻璃面的压区面积的1.0~15%。(The invention provides a paper feed roller which can restrain the poor paper transportation for a long time. The paper feed roller 10 comprises a shaft body 12 and an elastic body layer 14 formed on the periphery of the shaft body 12, wherein a plurality of convex parts 16 forming surface unevenness are arranged on the periphery surface of the elastic body layer 14, and the contact area of the whole part contacting with the glass surface when the glass plate is pressed on the periphery surface of the paper feed roller 10 by a load of 0.5-2.3N per 1cm of axial length is 1.0-15% of the nip area of the glass surface.)
1. A paper feed roller for an electrophotographic apparatus, comprising a shaft body and an elastic body layer formed on the outer periphery of the shaft body,
a plurality of convex parts forming surface unevenness are provided on the peripheral surface of the elastomer layer,
The contact area of the whole part contacting with the glass surface when the glass plate is pressed on the peripheral surface of the paper feeding roller by a load of 0.5-2.3N per 1cm of axial length is 1.0-15% of the nip area of the glass surface.
2. The paper feeding roller according to claim 1, wherein a ratio of a contact area of each convex portion in the entire portion in contact with the glass surface is 0.02 to 10%.
3. The paper feeding roller as claimed in claim 1 or 2, wherein the plurality of protrusions are regularly arranged on the circumferential surface of the elastic body layer.
4. The paper feeding roller according to any one of claims 1 to 3, wherein the plurality of projections are constituted by two kinds of projections having different heights.
5. The paper feeding roller as claimed in claim 4, wherein the height of the lower one of the two kinds of projections having different heights is 70 to 80% of the height of the higher one.
Technical Field
The present invention relates to a paper feed roller suitable for use in electrophotographic apparatuses such as copiers, printers, and facsimile machines that employ an electrophotographic system.
Background
The paper feed roller is formed in a cylindrical shape from an elastic material such as a crosslinked rubber, and the peripheral surface thereof is a contact surface with the paper. Paper dust generated from paper may adhere to the peripheral surface of the paper feed roller. Further, paper dust may accumulate on the circumferential surface of the paper feed roller during repeated contact with the paper. When paper dust accumulates, the contact area of the peripheral surface with respect to the paper decreases, and the friction coefficient of the contact surface with respect to the paper decreases. As a result, a conveyance failure of the paper may occur.
In order to suppress a paper conveyance failure, a paper feed roller having a concave-convex portion formed on the circumferential surface thereof is known (patent document 1). For example, patent document 1 discloses a paper feed roller in which a plurality of ridges and grooves are formed parallel to the axial direction of the paper feed roller.
Disclosure of Invention
Problems to be solved by the invention
The conventional paper feed roller is not sufficient in maintaining a good friction coefficient for a long period of time from the initial stage of use. In particular, among the paper sheets used in recent years, there are low-quality paper sheets, and paper dust is likely to be generated in the low-quality paper sheets, and a paper sheet conveyance failure is likely to be generated in an early stage.
The invention provides a paper feed roller which can restrain poor paper feeding for a long time.
Means for solving the problems
In order to solve the above problems, a paper feed roller according to the present invention is a paper feed roller for an electrophotographic apparatus including a shaft body and an elastic layer formed on an outer periphery of the shaft body, wherein a plurality of convex portions forming surface irregularities are provided on a peripheral surface of the elastic layer, and a contact area of a whole portion contacting a glass surface when a glass plate is pressed against the peripheral surface of the paper feed roller with a load of 0.5 to 2.3N per 1cm axial length is 1.0 to 15% of a nip area of the glass surface.
In the paper feed roller according to the present invention, a ratio of a contact area of each convex portion in the entire portion in contact with the glass surface is preferably 0.02 to 10%. Preferably, the plurality of projections are regularly arranged on the circumferential surface of the elastomer layer. The plurality of projections may be formed of two kinds of projections having different heights. In this case, it is preferable that the height of the lower convex portion of the two kinds of convex portions having different heights is 70 to 80% of the height of the higher convex portion.
Effects of the invention
According to the paper feed roller of the present invention, the contact area of the entire portion in contact with the glass surface when the glass plate is pressed against the peripheral surface of the paper feed roller with a load of 0.5 to 2.3N per 1cm of axial length is 1.0 to 15% of the nip area with the glass surface, and by reducing the contact area with the glass surface, the contact area with the paper when the paper is conveyed is reduced, so that the generation amount of paper dust due to cutting of the paper can be suppressed. Further, by reducing the contact area with the paper, paper dust generated when the paper is conveyed moves from the convex portion to the concave portion on the roller surface immediately, and a decrease in the friction coefficient due to the paper dust staying and adhering to the contact portion with the paper can be suppressed. This can suppress a paper conveyance failure for a long period of time.
Further, if the ratio of the contact area per convex portion in the entire portion in contact with the glass surface is 0.02 to 10%, the contact area per convex portion with the paper when the paper is conveyed is also small, and therefore the amount of paper dust generated by cutting the paper and the reduction in the friction coefficient can be further suppressed. Further, when the plurality of convex portions are regularly arranged on the peripheral surface of the elastic body layer, a groove of the concave portion is formed continuously in the arrangement direction, and the groove serves as a discharge path of paper dust generated when the paper is conveyed and easily discharges the paper dust to the outside of the roller. Further, if the plurality of convex portions are formed of two kinds of convex portions having different heights, the load (load) of the entire roller is received mainly by the high convex portions, and therefore the load (load) for the low convex portions can be reduced, and the contact area with the paper sheet of the entire roller can be easily reduced. Further, the low convex portion contributes to the conveyance of the sheet even if the contact load is small, and therefore, the conveyance force of the sheet is easily secured, and the conveyance failure of the sheet is suppressed.
Drawings
Fig. 1 is an external view schematically showing a paper feed roller according to an embodiment of the present invention.
Fig. 2 shows an example of the shape of a plurality of projections provided on the circumferential surface of the elastic layer of the paper feed roller.
Fig. 3 shows an example of arrangement of a plurality of convex portions provided on the circumferential surface of the elastic layer of the paper feed roller.
Fig. 4 is a diagram showing a method of determining an area ratio of an actual contact portion when a glass plate is pressed against the peripheral surface of a paper feed roller.
FIG. 5 is a photograph showing the nip portion when the glass plate is pressed against the peripheral surface of the paper feed roller in example 1.
Detailed Description
The paper feed roller according to the present invention (hereinafter, may be simply referred to as a paper feed roller) will be described in detail. Fig. 1 is an external view schematically showing a paper feed roller according to an embodiment of the present invention.
The paper feed roller 10 according to one embodiment of the present invention includes a shaft 12 and an elastic body layer 14 formed on the outer periphery of the shaft 12. The elastic body layer 14 becomes a layer (outermost layer) appearing on the surface of the paper feed roller 10. The elastomer layer 14 is tubular (cylindrical). A plurality of
In order to reduce the contact area with the paper sheet when the paper sheet is conveyed in the paper feed roller 10, the contact area (total area of actual contact portions) of the entire portion that contacts the glass surface when the glass sheet is pressed against the circumferential surface of the paper feed roller 10 (here, the circumferential surface of the elastic body layer 14) with a load of 0.5 to 2.3N per 1cm of axial length is 1.0 to 15% of the nip area with the glass surface. The nip area is the area of the entire nip portion, which is a region recessed when the glass sheet is pressed against the circumferential surface of the sheet feed roller 10, and the contact area is the area of the entire portion of the nip portion that actually contacts the glass surface. By reducing the contact area with the glass surface, the contact area with the paper when the paper is conveyed is reduced, and therefore the amount of paper dust generated by cutting the paper can be suppressed. Further, since the contact area with the paper is small, paper dust generated when the paper is conveyed moves from the convex portion to the concave portion on the roller surface immediately, and a decrease in friction coefficient due to the paper dust staying and adhering to the contact portion with the paper can be suppressed. This can suppress a paper conveyance failure for a long period of time. The contact area is more preferably within a range of 3.0 to 12% of the nip area, and still more preferably within a range of 5.0 to 12% of the nip area.
The ratio of the contact area (the total area of the actual contact portions) can be determined by observing a predetermined range of the nip portion when the glass plate is pressed against the peripheral surface of the paper feed roller 10 with a predetermined load using a microscope. The ratio of the contact area (the total area of the actual contact portions) can be adjusted by the shape of the convex portions, the density of the convex portions, the elasticity (material) of the convex portions, and the like.
In the sheet feeding roller 10, the ratio of the contact area of each convex portion in the whole of the portion in contact with the glass surface is preferably small. Since the contact area with the paper sheet is reduced for each convex portion when the paper sheet is conveyed, the amount of paper dust generated by cutting the paper sheet and the reduction in the friction coefficient can be further suppressed. From this viewpoint, the ratio of the contact area per convex portion is preferably 0.02 to 10%. More preferably 0.1 to 5%. The ratio of the contact area of each convex portion (the area of the actual contact portion) can be determined by observing a predetermined range of the nip portion where the glass plate is pressed against the peripheral surface of the paper feed roller 10 with a predetermined load by a microscope.
The plurality of
The height of the
In fig. 1, the
In fig. 1, the plurality of
In fig. 1, the plurality of
The shape of the plurality of convex portions provided on the circumferential surface of the elastomer layer 14 is not limited to the hemispherical
Fig. 2 shows an example of the shape of a plurality of projections provided on the circumferential surface of the elastomer layer 14. Fig. 2 (a) shows a
The plurality of protrusions provided on the circumferential surface of the elastomer layer 14 may be constituted by only one of the above-described various protrusions, or may be constituted by combining two or more kinds thereof. For example, the circumferential surface of the elastic layer 14 of one paper feed roller 10 may include hemispherical
The plurality of protrusions provided on the circumferential surface of the elastomer layer 14 may be arranged in an arrangement other than the arrangement shown in fig. 1. Fig. 3 shows another arrangement of a plurality of projections.
In the paper feed roller 20 shown in fig. 3 (a), a plurality of
In the paper feed roller 30 shown in fig. 3 (b), the
In the paper feed roller 40 of fig. 3 (c), the
In the paper feed roller 50 shown in fig. 3 (d), the
Next, a material structure of the paper feed roller according to the present invention will be described.
As the shaft body 12, a metal mandrel composed of a solid body made of metal, a metal cylindrical body having a hollow interior, or the like is used. Examples of the material include stainless steel, aluminum, and a material obtained by plating iron. Further, an adhesive, a primer, or the like may be applied to the shaft body 12 as necessary, or the adhesive, the primer, or the like may be electrically conductive as necessary.
The elastomer layer 14 is formed of an elastic material such as a crosslinked rubber. The material is not particularly limited as long as it is a rubber-like elastic material. For example, a known rubber material such as urethane rubber, chlorohydrin rubber, and silicone rubber can be used.
The elastomer layer 14 preferably has electrical conductivity or electrical conductivity. Specifically, the volume resistivity of the elastomer layer 14 is preferably 102~1010Ω·cm、103~109Ω·cm、104~108Range of Ω · cm. When the elastic layer 14 has conductivity or semiconductivity, the residual charge on the surface of the elastic layer 14 is easily reduced, and the adhesion of paper powder is easily suppressed.
The elastomer layer 14 may contain a conductive agent from the viewpoint of lowering the resistance. Examples of the conductive agent include an electron conductive agent and an ion conductive agent. Examples of the electron conductive agent include carbon black, graphite, and c-TiO2、c-ZnO、c-SnO2(c-means conductivity), and the like. Examples of the ion conductive agent include quaternary ammonium salts, borates, and surfactants.
The elastomer layer 14 may be added with various additives as needed. Examples of the additives include lubricants, vulcanization accelerators, antioxidants, light stabilizers, viscosity modifiers, processing aids, flame retardants, plasticizers, fillers, dispersants, defoaming agents, pigments, and mold release agents.
The thickness of the elastomer layer 14 is not particularly limited, and may be set as appropriate within a range of 0.1 to 10 mm.
The elastomer layer 14 may be formed by molding or the like based on a molding die using a rubber composition. For example, the elastic body layer 14 can be formed on the outer periphery of the shaft body 12 by disposing the shaft body 12 coaxially in the hollow portion of a roll forming mold, injecting an uncrosslinked rubber composition, heating, curing (crosslinking), and then releasing the mold. As the forming mold, a mold having a concave portion formed on its inner peripheral surface in a shape corresponding to the
The concave portion on the inner peripheral surface of the forming die can be formed by various concave portion forming methods such as electric discharge machining, etching, shot blasting, polishing, co-precipitation plating, and a combination thereof. In the co-precipitation plating, a uniform resin particle is contained in the plating solution, the resin particle is precipitated on the inner peripheral surface of the molding die together with the plating metal, and the resin particle appearing on the plating surface is removed, whereby a concave portion can be formed on the inner peripheral surface of the molding die.
While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, in the above embodiment, the paper feed roller 10 has a structure including the shaft body 12 and the elastic layer 14 formed on the outer periphery of the shaft body 12, and the outermost layer is the elastic layer 14, but a surface layer may be provided outside the elastic layer 14. In this case, the surface layer becomes the outermost layer, and the elastomer layer 14 is disposed inside the surface layer. The
- 上一篇:一种医用注射器针头装配设备
- 下一篇:吸收性物品制造方法以及吸收性物品制造装置