WO2015141270A1 - Paper feed roller and image forming apparatus - Google Patents

Paper feed roller and image forming apparatus Download PDF

Info

Publication number
WO2015141270A1
WO2015141270A1 PCT/JP2015/051715 JP2015051715W WO2015141270A1 WO 2015141270 A1 WO2015141270 A1 WO 2015141270A1 JP 2015051715 W JP2015051715 W JP 2015051715W WO 2015141270 A1 WO2015141270 A1 WO 2015141270A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper feed
feed roller
paper
roller
outer peripheral
Prior art date
Application number
PCT/JP2015/051715
Other languages
French (fr)
Japanese (ja)
Inventor
敬士 山本
浩一 西森
峯　章弘
俊裕 田村
Original Assignee
住友ゴム工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友ゴム工業株式会社 filed Critical 住友ゴム工業株式会社
Publication of WO2015141270A1 publication Critical patent/WO2015141270A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/10—Materials
    • B65H2401/11—Polymer compositions
    • B65H2401/111—Elastomer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/50—Surface of the elements in contact with the forwarded or guided material
    • B65H2404/51—Cross section, i.e. section perpendicular to the direction of displacement
    • B65H2404/513—Cross section, i.e. section perpendicular to the direction of displacement with limited number of active areas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/50—Surface of the elements in contact with the forwarded or guided material
    • B65H2404/52—Surface of the elements in contact with the forwarded or guided material other geometrical properties
    • B65H2404/521—Reliefs
    • B65H2404/5213—Geometric details
    • B65H2404/52131—Grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/50—Surface of the elements in contact with the forwarded or guided material
    • B65H2404/52—Surface of the elements in contact with the forwarded or guided material other geometrical properties
    • B65H2404/521—Reliefs
    • B65H2404/5213—Geometric details
    • B65H2404/52132—Geometric details perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1912—Banknotes, bills and cheques or the like

Definitions

  • the present invention relates to a paper feed roller used for paper feed in an image forming apparatus such as an electrostatic copying machine or various printers, and an image forming apparatus including the paper feed roller.
  • a paper feeding mechanism in an electrostatic copying machine for example, a laser printer, a plain paper facsimile machine, a complex machine thereof, an image forming apparatus such as an ink jet printer, and an automatic cash dispenser (ATM)
  • Various paper feed rollers are incorporated.
  • the paper feed roller include a paper feed roller, a transport roller, a platen roller, and a paper discharge roller that rotate while contacting a paper (including paper and plastic film, etc.) and convey the paper by friction. Can be mentioned.
  • a paper feed roller is generally used that has a roller body that is formed into a cylindrical shape from an elastic material such as a cross-linked rubber and whose outer peripheral surface is a contact surface with the paper.
  • paper dust and dirt generated from the paper are likely to adhere to the outer peripheral surface of the roller body, and paper dust and dirt accumulate on the outer peripheral surface while repeatedly contacting the paper, so that the contact area of the outer peripheral surface to the paper In some cases, the coefficient of friction decreases and a paper conveyance failure occurs relatively early.
  • a plurality of ridges and grooves are formed on the outer peripheral surface of the roller body in parallel with the axial direction of the roller body.
  • various studies have been made on the shapes of the ridges and grooves, and they have been put to practical use.
  • a paper feed roller commonly called a round knurl
  • a plurality of ridges whose cross-sectional shape perpendicular to the axial direction of the roller body is on a normal distribution curve are arranged at equal intervals in the circumferential direction on the outer peripheral surface of the roller body.
  • the outer peripheral surface of the roller body has a substantially V-shaped or U-shaped cross section in the direction perpendicular to the axial direction of the roller body.
  • paper feeding rollers commonly referred to as square knurls
  • the former round knurl is said to be effective in suppressing a decrease in the coefficient of friction due to adhesion of paper dust and dirt when repeated use.
  • the latter angular knurling is said to be effective in improving the coefficient of friction at the initial use.
  • Patent Document 2 a plurality of ridges in which the cross-sectional shape in the direction orthogonal to the axial direction of the roller body has a substantially triangular shape with different side inclination angles on one side and the other side in the circumferential direction are arranged in the circumferential direction.
  • a so-called saw-shaped paper feed roller is described that is arranged at equal intervals and so that the inclined sides are directly connected between adjacent ridges.
  • an object of the present invention is to reduce the friction coefficient of the paper feed roller by letting paper dust generated from the paper escape from the contact surface even when using inexpensive paper with a high ash content or paper containing a large amount of filler.
  • the invention according to claim 1 includes a roller main body integrally formed in a cylindrical shape by an elastic material, and extends on the outer peripheral surface of the roller main body in the axial direction of the roller main body and has a constant width in the circumferential direction.
  • a paper feed roller in which a large number of ridges and grooves are formed so that convex portions and concave portions appear alternately, and the convex portions are adjacent concave portions on both sides and a rounded curved line having a predetermined radius of curvature.
  • the protrusion has a flat top surface along the outer peripheral surface of the roller body, and the recess is formed by an arc having a larger radius of curvature than the curve line connected to the protrusion.
  • a paper feed roller that is formed.
  • the flat top surface formed on the ridge has a width W1 (a width along the outer peripheral surface direction of the roller main body), and the width of the concave groove (the roller main body).
  • the width of the outer peripheral surface of the paper feed roller is W2, and the relationship of W1 ⁇ W2 is satisfied.
  • the invention according to claim 3 is the paper feed roller according to claim 2, wherein the width W1 of the flat top surface is 0.1 to 0.3 mm.
  • the invention according to claim 4 is the paper feed roller according to claim 3, wherein the height difference between the convex portion and the concave portion is 0.1 to 0.2 mm.
  • the length from the center of one concave portion to the center of the other concave portion is 0.5 to 1.0 mm.
  • an image forming apparatus comprising the paper feed roller according to the first aspect.
  • the image forming apparatus employs an FRR system as a paper separating device, and the paper feed roller is employed as a feed roller in the paper separating device.
  • the concave grooves formed on the outer peripheral surface of the paper feed roller serve to release paper dust. Further, since the ridge formed on the outer peripheral surface has a flat top surface, the conveyance stress per unit contact area becomes relatively large. In addition, the coefficient of friction increases. Therefore, regardless of the type of paper, the paper passing performance can be maintained well, and the paper separation performance can be maintained well.
  • FIG. 1 is a side view of a paper feed roller 10 according to an embodiment of the present invention.
  • FIG. 2 is an enlarged view of a portion A in FIG.
  • FIG. 3 is an enlarged view showing convex portions and concave portions formed on the outer peripheral surface of Comparative Example 1.
  • FIG. 1 is a side view of a paper feed roller 10 according to an embodiment of the present invention.
  • a paper feed roller 10 has a cylindrical roller body 11 formed integrally with an elastic material.
  • the shaft portion 12 incorporated in the roller body 11 can be applied in various forms, and is not limited to the illustrated one.
  • a feature of the paper feed roller 10 according to this embodiment is that a convex portion having a constant width in the circumferential direction R extends on the outer peripheral surface 11S of the roller main body 11 so as to extend in the axial direction of the roller main body 11 (perpendicular to the paper surface). That is, a large number of ridges 13 and grooves 14 are formed so that 13 and recesses 14 appear alternately.
  • FIG. 2 is an enlarged view of a portion A in FIG. With reference to FIG. 2, the convex part (protrusion) 13 and the concave part (concave groove) 14 are demonstrated concretely.
  • Each convex portion 13 is connected to adjacent concave portions 14 on both sides by a curved line having a predetermined radius of curvature R1. That is, the connecting edges between the both ends in the width direction of the convex portions (projections) 13 and the both ends in the width direction of the concave portions (concave grooves) 14 are not rounded, but are rounded into a curve (curved surface) having a radius of curvature R1. Moreover, each convex part (convex ridge) 13 has a flat top surface 13 ⁇ / b> F along the outer peripheral surface 11 ⁇ / b> S of the roller body 11. A width (width along the circumferential direction R of the roller body 11) W1 of the top surface 13F is set to a predetermined dimension.
  • each concave portion 14 is an arc-shaped concave portion having a radius of curvature R2 larger than a curved line connected to the convex portion 13.
  • the width W2 of each concave portion (concave groove) 14 is set to a predetermined dimension.
  • the height H of each convex portion 13 (the height from the bottom of the concave portion 14 to the top surface 13F of the convex portion 13) is set to a predetermined height.
  • an interval I from the center of one concave portion 14 to the center of the other concave portion 14 is determined.
  • the above values are specifically formed as follows.
  • R1 0.1mm
  • R2 0.25mm
  • W1, H, and I can exhibit good functions as the roller body 11 within the following ranges.
  • the width W1 of the top surface 13F and the width W2 of the concave portion (concave groove) 14 are: W1 ⁇ W2 or more preferably W1 ⁇ W2 If so, the roller body 11 can exhibit a good function.
  • the diameter of the outer peripheral surface 11S of the roller main body 11 according to the embodiment is 24.6 mm, and extends along the outer peripheral surface 11S of the roller main body 11 to the center of one convex portion 13 and the concave portion 14 on both sides thereof.
  • the occupying angle is designed to be 3.8 °.
  • the roller body 11 is preferably integrally formed of a crosslinked product of a rubber composition containing ethylene propylene rubber as a rubber component and peroxide as a crosslinking agent. And it is preferable that the rubber component which becomes the basis of a rubber composition contains ethylene propylene rubber and isoprene rubber.
  • ethylene propylene rubber examples include ethylene propylene rubber (EPM) in a narrow sense that is a copolymer of ethylene and propylene, and ethylene propylene diene rubber (EPDM) that is a copolymer of ethylene, propylene, and diene. Is preferred. Further, as the EPDM, any of so-called oil-extended EPDM that has progressed with progressing oil and non-oil-extended EPDM that has not progressed with progressing oil may be used.
  • EPM ethylene propylene rubber
  • EPDM ethylene propylene diene rubber
  • the crosslinking agent it is preferable to use a peroxide crosslinking agent in order to maintain the roller body 11 with a friction coefficient.
  • reinforcing materials and fillers such as carbon black, or various additives such as oil and plastic material may be appropriately selected and blended with the rubber composition.
  • the roller body 11 can be formed by preparing a rubber composition containing each component and using the rubber composition by, for example, a press molding method, an extrusion molding method, or the like.
  • the composition (component) of the roller main body 11 and the manufacturing method thereof are not characteristic, but the shape formed on the outer peripheral surface of the roller main body 11 is characteristic. Therefore, further explanation regarding the composition and manufacturing method is omitted. .
  • the rubber composition was vulcanized using a transfer mold and molded into a cylindrical shape. Next, the cylindrical body was cut into an arbitrary width and fitted into a paper feed resin core to produce an evaluation sample. Both the feed roller and the retard roller are the same paper feed roller, and can be incorporated into an FRR type paper separating apparatus.
  • convex portions (projections) 13 and concave portions (concave grooves) 14 shown in FIG. 3 are formed on the outer peripheral surface of the roller body.
  • the outer peripheral surface was polished without forming convex portions (projections) and concave portions (concave grooves) on the outer peripheral surface of the roller body.
  • Test method The paper feeding roller prepared above was incorporated into a commercially available printer, and an appropriate paper was selected to perform a paper passing test. The test was interrupted every 1000 sheets, 3000 sheets, 5000 sheets, 10000 sheets, 20000 sheets, and 10000 sheets thereafter, and the coefficient of friction of the paper feed roller was measured. The test was terminated when a paper passing failure occurred and the number of papers passed was recorded.

Landscapes

  • Delivering By Means Of Belts And Rollers (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

While low-quality paper has recently become widespread, it is known that low-quality paper causes paper feeding problems, and countermeasures against paper feeding problems on the paper feed roller side are required. The present invention addresses this problem by providing a paper feed roller (10), which is provided with a roller body (11) that is integrally formed in a cylindrical shape by an elastic material, and which has multiple protruding strips and recessed grooves formed on the outer peripheral surface (11S) of the roller body (11) so as to extend in the axial direction of the roller body and so that protruding portions (13) and recessed portions (14) with a constant width alternate in the circumferential direction (R), said paper feed roller being characterized in that: each of the protruding portions (13) is connected to the recessed portions (14) adjacent to both sides thereof by a rounded curve having a predetermined curvature radius; each of the protruding strips has a flat top surface (13F) along the outer peripheral surface (11S) of the roller body (11); and each of the recessed portions (14) is formed by a circular arc having a curvature radius larger than that of the curve connected to the protruding portions (13).

Description

紙送りローラおよび画像形成装置Paper feed roller and image forming apparatus
　この発明は、静電式複写機や各種プリンタ等の画像形成装置において紙送りに用いられる紙送りローラ、および紙送りローラを備えた画像形成装置に関する。 The present invention relates to a paper feed roller used for paper feed in an image forming apparatus such as an electrostatic copying machine or various printers, and an image forming apparatus including the paper feed roller.
　たとえば静電式複写機、レーザプリンタ、普通紙ファクシミリ装置、およびこれらの複合機や、あるいはインクジェットプリンタ等の画像形成装置、さらには自動現金預払機（ＡＴＭ）等の機器類における紙送り機構には、各種の紙送りローラが組み込まれている。
　紙送りローラとしては、用紙（紙およびプラスチックフィルム等を含む。以下同様。）と接触しながら回転して摩擦によって用紙を搬送する、たとえば給紙ローラ、搬送ローラ、プラテンローラ、排紙ローラ等が挙げられる。 For example, a paper feeding mechanism in an electrostatic copying machine, a laser printer, a plain paper facsimile machine, a complex machine thereof, an image forming apparatus such as an ink jet printer, and an automatic cash dispenser (ATM) Various paper feed rollers are incorporated.
Examples of the paper feed roller include a paper feed roller, a transport roller, a platen roller, and a paper discharge roller that rotate while contacting a paper (including paper and plastic film, etc.) and convey the paper by friction. Can be mentioned.
　紙送りローラは、従来より、たとえばゴムの架橋物等の弾性材料によって筒状に形成され、その外周面が用紙との接触面とされたローラ本体を備えたものが一般的に用いられる。
　しかし、ローラ本体の外周面には用紙から発生する紙粉や汚れが付着し易く、用紙と繰り返し接触するうちに外周面に紙粉や汚れが蓄積されることで、用紙に対する外周面の接触面積や摩擦係数が低下して、比較的早期に用紙の搬送不良を生じる場合がある。 Conventionally, a paper feed roller is generally used that has a roller body that is formed into a cylindrical shape from an elastic material such as a cross-linked rubber and whose outer peripheral surface is a contact surface with the paper.
However, paper dust and dirt generated from the paper are likely to adhere to the outer peripheral surface of the roller body, and paper dust and dirt accumulate on the outer peripheral surface while repeatedly contacting the paper, so that the contact area of the outer peripheral surface to the paper In some cases, the coefficient of friction decreases and a paper conveyance failure occurs relatively early.
　使用初期から長期にわたって良好な摩擦係数を維持して用紙の搬送不良を防止するためには、ローラ本体の外周面に、ローラ本体の軸方向と平行に複数本の凸条および凹溝を形成するのが効果的であることが知られており、かかる効果を最適化するために凸条や凹溝の形状について種々検討され、実用化されている。
　中でも、ローラ本体の外周面に、当該ローラ本体の軸方向と直交方向の断面形状が正規分布曲線上である凸条を複数本、周方向に等間隔に配列した紙送りローラ（丸ローレットと通称されている。）が、広く一般的に用いられている。 In order to maintain a good coefficient of friction from the beginning of use for a long time and prevent paper conveyance failure, a plurality of ridges and grooves are formed on the outer peripheral surface of the roller body in parallel with the axial direction of the roller body. In order to optimize such an effect, various studies have been made on the shapes of the ridges and grooves, and they have been put to practical use.
Among them, a paper feed roller (commonly called a round knurl) in which a plurality of ridges whose cross-sectional shape perpendicular to the axial direction of the roller body is on a normal distribution curve are arranged at equal intervals in the circumferential direction on the outer peripheral surface of the roller body. Are widely used in general.
　また、たとえば特許文献１の図２～図４に記載されているように、ローラ本体の外周面に、当該ローラ本体の軸方向と直交方向の断面形状が略Ｖ字状、略Ｕ字状等とされた凹溝を複数本、周方向に等間隔に配列した紙送りローラ（角ローレットと通称されている。）も、同様に、広く一般的に用いられている。
　このうち前者の丸ローレットは、使用を繰り返した際に、紙粉や汚れの付着による摩擦係数の低下を抑制する上で効果があるとされている。また後者の角ローレットは、使用初期の摩擦係数を向上させる上で効果があるとされている。 Further, as described in FIGS. 2 to 4 of Patent Document 1, for example, the outer peripheral surface of the roller body has a substantially V-shaped or U-shaped cross section in the direction perpendicular to the axial direction of the roller body. Similarly, paper feeding rollers (commonly referred to as square knurls) in which a plurality of concave grooves are arranged at equal intervals in the circumferential direction are also widely used in general.
Of these, the former round knurl is said to be effective in suppressing a decrease in the coefficient of friction due to adhesion of paper dust and dirt when repeated use. The latter angular knurling is said to be effective in improving the coefficient of friction at the initial use.
　さらに特許文献２には、ローラ本体の軸方向と直交方向の断面形状が、周方向の一方側と他方側で辺の傾斜角度の異なる略三角形状とされた凸条を複数本、周方向に等間隔で、かつ隣り合う凸条間で傾斜辺同士が直接つながるように配列した、いわゆる鋸形状の紙送りローラが記載されている。 Furthermore, in Patent Document 2, a plurality of ridges in which the cross-sectional shape in the direction orthogonal to the axial direction of the roller body has a substantially triangular shape with different side inclination angles on one side and the other side in the circumferential direction are arranged in the circumferential direction. A so-called saw-shaped paper feed roller is described that is arranged at equal intervals and so that the inclined sides are directly connected between adjacent ridges.
特開平１１－１０６０６７号公報Japanese Patent Application Laid-Open No. 11-106067 特開２００３－１１２８３３号公報JP 2003-112833 A
　発明者が検討したところ、従来の紙送りローラは、いずれも使用初期から長期にわたって良好な摩擦係数を維持するという効果の点で、未だ十分とは言えないことが明らかとなった。
　特に近年では低品質用紙が普及しているが、低品質用紙は通紙不良を発生させる原因であることがわかっており、紙送りローラ側での通紙不良に対する問題対策が求められている。 As a result of studies by the inventors, it has been clarified that none of the conventional paper feed rollers is still sufficient in terms of the effect of maintaining a good friction coefficient for a long period from the initial use.
In particular, in recent years, low-quality paper has become widespread, but it has been found that low-quality paper is a cause of poor paper passing, and there is a need for countermeasures against poor paper passing on the paper feed roller side.
　すなわち、低品質用紙は、灰分の多い安価な用紙や、充填材を多く含む粗悪紙であり、これら灰分や充填材を多く含む用紙は、紙粉や汚れが発生し易く、また、充填材に含まれる脂肪族成分（紙粉）が紙送りローラの表面に付着し、用紙との摩擦係数低下につながることがわかっている。
　そこでこの発明の目的は、灰分の多い安価な用紙や、充填材を多く含む用紙を使用した際にも、用紙から生じる紙粉等を接触面から逃がすことによって、紙送りローラの摩擦係数の低下を抑制し、使用初期から長期にわたって良好な摩擦係数を維持して、用紙の搬送不良を確実に防止できる紙送りローラ、およびかかる紙送りローラを用いた画像形成装置を提供することにある。 In other words, low-quality paper is cheap paper with a lot of ash and poor paper with a lot of fillers. Paper with a lot of ash and fillers is prone to paper dust and dirt. It has been found that the contained aliphatic component (paper dust) adheres to the surface of the paper feed roller, leading to a reduction in the coefficient of friction with the paper.
Accordingly, an object of the present invention is to reduce the friction coefficient of the paper feed roller by letting paper dust generated from the paper escape from the contact surface even when using inexpensive paper with a high ash content or paper containing a large amount of filler. It is an object of the present invention to provide a paper feed roller capable of suppressing the above-described problem, maintaining a good friction coefficient from the beginning of use for a long period of time, and reliably preventing poor paper conveyance, and an image forming apparatus using such a paper feed roller.
　請求項１記載の発明は、弾性材料によって筒状に一体に形成されたローラ本体を備え、前記ローラ本体の外周面に、ローラ本体の軸方向に延びるように、かつ、周方向に一定幅の凸部と凹部とが交互に現れるように多数の凸条および凹溝が形成された紙送りローラであって、前記凸部は、隣接する両側の凹部と所定の曲率半径のアール状の湾曲線でつながっており、かつ、前記凸条は、前記ローラ本体の外周面に沿った平坦な頂面を有していて、前記凹部は、前記凸部とつながる湾曲線よりも曲率半径の大きな円弧によって形成されていることを特徴とする紙送りローラである。 The invention according to claim 1 includes a roller main body integrally formed in a cylindrical shape by an elastic material, and extends on the outer peripheral surface of the roller main body in the axial direction of the roller main body and has a constant width in the circumferential direction. A paper feed roller in which a large number of ridges and grooves are formed so that convex portions and concave portions appear alternately, and the convex portions are adjacent concave portions on both sides and a rounded curved line having a predetermined radius of curvature. And the protrusion has a flat top surface along the outer peripheral surface of the roller body, and the recess is formed by an arc having a larger radius of curvature than the curve line connected to the protrusion. A paper feed roller that is formed.
　請求項２記載の発明は、前記凸条に形成された平坦な頂面は、その幅（前記ローラ本体の外周面方向に沿った幅）がＷ１であり、前記凹溝の幅（前記ローラ本体の外周面方向に沿った幅）がＷ２であり、Ｗ１≦Ｗ２の関係を満たすことを特徴とする、請求項１記載の紙送りローラである。
　請求項３記載の発明は、前記平坦な頂面の幅Ｗ１は、０．１～０．３ｍｍであることを特徴とする、請求項２記載の紙送りローラである。 According to a second aspect of the present invention, the flat top surface formed on the ridge has a width W1 (a width along the outer peripheral surface direction of the roller main body), and the width of the concave groove (the roller main body). The width of the outer peripheral surface of the paper feed roller is W2, and the relationship of W1 ≦ W2 is satisfied.
The invention according to claim 3 is the paper feed roller according to claim 2, wherein the width W1 of the flat top surface is 0.1 to 0.3 mm.
　請求項４記載の発明は、前記凸部と前記凹部とは、その高さの差が０．１～０．２ｍｍであることを特徴とする、請求項３記載の紙送りローラである。
　請求項５記載の発明は、前記凹部、凸部および凹部でつながる１組の凹凸凹部において、一方の凹部の中央から他方の凹部の中央までの長さは、０．５～１．０ｍｍであることを特徴とする、請求項３または４に記載の紙送りローラである。 The invention according to claim 4 is the paper feed roller according to claim 3, wherein the height difference between the convex portion and the concave portion is 0.1 to 0.2 mm.
In a fifth aspect of the present invention, in the set of concave and convex concave portions connected by the concave portions, the convex portions and the concave portions, the length from the center of one concave portion to the center of the other concave portion is 0.5 to 1.0 mm. The paper feed roller according to claim 3 or 4, wherein the paper feed roller is characterized by the above.
　請求項６記載の発明は、請求項１に記載の紙送りローラを備えることを特徴とする画像形成装置である。
　請求項７記載の発明は、前記画像形成装置は、用紙分離装置としてＦＲＲ方式のものが採用されており、前記紙送りローラは、前記用紙分離装置におけるフィードローラとして採用されていることを特徴とする、請求項６記載の画像形成装置である。 According to a sixth aspect of the present invention, there is provided an image forming apparatus comprising the paper feed roller according to the first aspect.
According to a seventh aspect of the invention, the image forming apparatus employs an FRR system as a paper separating device, and the paper feed roller is employed as a feed roller in the paper separating device. The image forming apparatus according to claim 6.
　この発明によれば、紙送りローラの外周面に形成された凹溝が紙粉を逃がす役目をする。また、外周面に形成された凸条は、平坦な頂面を有しているため、単位接触面積あたりの搬送応力が比較的大きくなる。また、摩擦係数が高くなる。よって、用紙の種類に依らず、通紙性能を良好に維持でき、かつ、用紙の分離性能を良好に維持できる。 According to this invention, the concave grooves formed on the outer peripheral surface of the paper feed roller serve to release paper dust. Further, since the ridge formed on the outer peripheral surface has a flat top surface, the conveyance stress per unit contact area becomes relatively large. In addition, the coefficient of friction increases. Therefore, regardless of the type of paper, the paper passing performance can be maintained well, and the paper separation performance can be maintained well.
図１は、この発明の一実施形態に係る紙送りローラ１０の側面図である。FIG. 1 is a side view of a paper feed roller 10 according to an embodiment of the present invention. 図２は、図１のＡ部分の拡大図である。FIG. 2 is an enlarged view of a portion A in FIG. 図３は、比較例１の外周面に形成された凸部および凹部を示す拡大図である。FIG. 3 is an enlarged view showing convex portions and concave portions formed on the outer peripheral surface of Comparative Example 1.
　以下には、図面を参照して、この発明の実施形態について具体的に説明をする。
　図１は、この発明の一実施形態に係る紙送りローラ１０の側面図である。図１を参照して、紙送りローラ１０は、弾性材料によって一体に形成された円筒状のローラ本体１１を有する。ローラ本体１１の中に組み込まれるシャフト部１２は、種々の形態が適用でき、図示のものに限定されるものではない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view of a paper feed roller 10 according to an embodiment of the present invention. Referring to FIG. 1, a paper feed roller 10 has a cylindrical roller body 11 formed integrally with an elastic material. The shaft portion 12 incorporated in the roller body 11 can be applied in various forms, and is not limited to the illustrated one.
　この実施形態に係る紙送りローラ１０の特徴は、ローラ本体１１の外周面１１Ｓに、ローラ本体１１の軸方向（紙面に垂直方向）に延びるように、かつ、周方向Ｒに一定幅の凸部１３と凹部１４とが交互に現れるように、多数の凸条１３および凹溝１４が形成されていることである。
　図２は、図1のＡ部分の拡大図である。図２を参照して、凸部（凸条）１３および凹部（凹溝）１４について、具体的に説明する。 A feature of the paper feed roller 10 according to this embodiment is that a convex portion having a constant width in the circumferential direction R extends on the outer peripheral surface 11S of the roller main body 11 so as to extend in the axial direction of the roller main body 11 (perpendicular to the paper surface). That is, a large number of ridges 13 and grooves 14 are formed so that 13 and recesses 14 appear alternately.
FIG. 2 is an enlarged view of a portion A in FIG. With reference to FIG. 2, the convex part (protrusion) 13 and the concave part (concave groove) 14 are demonstrated concretely.
　各凸部１３は、隣接する両側の凹部１４と、それぞれ、所定の曲率半径Ｒ１の湾曲線でつながっている。すなわち、凸部（凸条）１３の幅方向両端と凹部（凹溝）１４の幅方向両端との接続エッジが、角ばっておらず、曲率半径Ｒ１の曲線（曲面）に丸められている。また、各凸部（凸条）１３は、ローラ本体１１の外周面１１Ｓに沿った平坦な頂面１３Ｆを有している。頂面１３Ｆの幅（ローラ本体１１の周方向Ｒに沿った幅）Ｗ１は、所定の寸法に設定されている。 Each convex portion 13 is connected to adjacent concave portions 14 on both sides by a curved line having a predetermined radius of curvature R1. That is, the connecting edges between the both ends in the width direction of the convex portions (projections) 13 and the both ends in the width direction of the concave portions (concave grooves) 14 are not rounded, but are rounded into a curve (curved surface) having a radius of curvature R1. Moreover, each convex part (convex ridge) 13 has a flat top surface 13 </ b> F along the outer peripheral surface 11 </ b> S of the roller body 11. A width (width along the circumferential direction R of the roller body 11) W1 of the top surface 13F is set to a predetermined dimension.
　さらに、各凹部１４は、凸部１３とつながる湾曲線よりも大きな曲率半径Ｒ２の円弧状凹部となっている。各凹部（凹溝）１４の幅Ｗ２は、所定の寸法に設定されている。
　また、各凸部１３の高さＨ（凹部１４の底から凸部１３の頂面１３Ｆまでの高さ）が所定の高さに設定されている。
　さらに、隣接する凹部１４、凸部１３および凹部１４でつながる１組の凹凸凹部において、一方の凹部１４の中央から他方の凹部１４の中央までの間隔Ｉが決められている。 Further, each concave portion 14 is an arc-shaped concave portion having a radius of curvature R2 larger than a curved line connected to the convex portion 13. The width W2 of each concave portion (concave groove) 14 is set to a predetermined dimension.
Further, the height H of each convex portion 13 (the height from the bottom of the concave portion 14 to the top surface 13F of the convex portion 13) is set to a predetermined height.
Further, in one set of concave and convex concave portions connected by the adjacent concave portion 14, convex portion 13 and concave portion 14, an interval I from the center of one concave portion 14 to the center of the other concave portion 14 is determined.
　この実施形態に係るローラ本体１１は、上記各値が具体的に次の通りに形成されている。
　　Ｒ１＝０．１ｍｍ
　　Ｒ２＝０．２５ｍｍ
　　Ｗ１＝０．３ｍｍ
　　Ｈ　＝０．１６ｍｍ
　　Ｉ　＝０．８ｍｍ
　　Ｗ２＝０．４３ｍｍ
　発明者の検討および確認によれば、上記各値のうち、Ｗ１、ＨおよびＩについては、次の範囲であれば、ローラ本体１１として良好な機能を発揮しうる。 In the roller body 11 according to this embodiment, the above values are specifically formed as follows.
R1 = 0.1mm
R2 = 0.25mm
W1 = 0.3mm
H = 0.16mm
I = 0.8mm
W2 = 0.43mm
According to the inventor's examination and confirmation, among the above values, W1, H, and I can exhibit good functions as the roller body 11 within the following ranges.
　　Ｗ１＝０．１～０．３ｍｍ
　　Ｈ　＝０．１～０．２ｍｍ
　　Ｉ　＝０．５～１．０ｍｍ
　また、頂面１３Ｆの幅Ｗ１と凹部（凹溝）１４の幅Ｗ２とは、
　　Ｗ１≦Ｗ２　または、より好ましくは、
　　Ｗ１＜Ｗ２
であれば、ローラ本体１１として良好な機能を発揮しうる。 W1 = 0.1-0.3mm
H = 0.1-0.2mm
I = 0.5-1.0mm
Further, the width W1 of the top surface 13F and the width W2 of the concave portion (concave groove) 14 are:
W1 ≦ W2 or more preferably
W1 <W2
If so, the roller body 11 can exhibit a good function.
　なお、実施形態に係るローラ本体１１の外周面１１Ｓの直径は、２４．６ｍｍであり、ローラ本体１１の外周面１１Ｓに沿って、１つの凸部１３とその両隣側の凹部１４の中央までが占める角度は、３．８°に設計されている。
　この実施形態において、ローラ本体１１は、ゴム分としてエチレンプロピレンゴム、架橋剤としてパーオキサイドを含むゴム組成物の架橋物によって一体に形成するのが好ましい。そして、ゴム組成物の基になるゴム分は、エチレンプロピレンゴムおよびイソプレンゴムを含むことが好ましい。 In addition, the diameter of the outer peripheral surface 11S of the roller main body 11 according to the embodiment is 24.6 mm, and extends along the outer peripheral surface 11S of the roller main body 11 to the center of one convex portion 13 and the concave portion 14 on both sides thereof. The occupying angle is designed to be 3.8 °.
In this embodiment, the roller body 11 is preferably integrally formed of a crosslinked product of a rubber composition containing ethylene propylene rubber as a rubber component and peroxide as a crosslinking agent. And it is preferable that the rubber component which becomes the basis of a rubber composition contains ethylene propylene rubber and isoprene rubber.
　エチレンプロピレンゴムとしては、エチレンとプロピレンの共重合体である狭義のエチレンプロピレンゴム（ＥＰＭ）、およびエチレンとプロピレンとジエンの共重合体であるエチレンプロピレンジエンゴム（ＥＰＤＭ）が挙げられるが、特にＥＰＤＭが好ましい。
　また、ＥＰＤＭとしては進展油で進展したいわゆる油展ＥＰＤＭ、および進展油で進展していない非油展ＥＰＤＭのいずれを用いてもよい。 Examples of ethylene propylene rubber include ethylene propylene rubber (EPM) in a narrow sense that is a copolymer of ethylene and propylene, and ethylene propylene diene rubber (EPDM) that is a copolymer of ethylene, propylene, and diene. Is preferred.
Further, as the EPDM, any of so-called oil-extended EPDM that has progressed with progressing oil and non-oil-extended EPDM that has not progressed with progressing oil may be used.
　架橋剤としては、過酸化物架橋剤を用いるのが、ローラ本体１１に摩擦係数を維持させる上で好ましい。
　また、ゴム組成物には、カーボンブラック等の補強材・充填材や、あるいはオイル、可塑材等の各種添加材を適宜選択して配合してもよい。
　ローラ本体１１は、各成分を含むゴム組成物を調製し、当該ゴム組成物を用いて、たとえばプレス成形法、押し出し成形法等によって形成することができる。 As the crosslinking agent, it is preferable to use a peroxide crosslinking agent in order to maintain the roller body 11 with a friction coefficient.
In addition, reinforcing materials and fillers such as carbon black, or various additives such as oil and plastic material may be appropriately selected and blended with the rubber composition.
The roller body 11 can be formed by preparing a rubber composition containing each component and using the rubber composition by, for example, a press molding method, an extrusion molding method, or the like.
　この発明では、ローラ本体１１の組成（成分）やその製造方法は特徴ではなく、ローラ本体１１の外周面に形成された形状に特徴を有するので、組成や製造方法に関するこれ以上の説明は省略する。 In the present invention, the composition (component) of the roller main body 11 and the manufacturing method thereof are not characteristic, but the shape formed on the outer peripheral surface of the roller main body 11 is characteristic. Therefore, further explanation regarding the composition and manufacturing method is omitted. .
　［製造方法］
　ゴム組成物をトランスファー金型を用いて加硫成型し、筒状に成型した。次に、任意の幅に筒体をカットし、給紙樹脂コアにはめ込んで評価サンプルを作製した。フィードローラ・リタードローラとも同じ紙送りローラとし、ＦＲＲ方式の用紙分離装置に組み込めるようにした。 [Production method]
The rubber composition was vulcanized using a transfer mold and molded into a cylindrical shape. Next, the cylindrical body was cut into an arbitrary width and fitted into a paper feed resin core to produce an evaluation sample. Both the feed roller and the retard roller are the same paper feed roller, and can be incorporated into an FRR type paper separating apparatus.
　作成した評価サンプルのうち、
（１）実施例は、ローラ本体の外周面に図２に示す凸部（凸条）１３および凹部（凹溝）１４が形成されたものであり、Ｗ１＝０．２２５ｍｍ、Ｈ＝０．１６ｍｍ、Ｒ１＝０．１ｍｍ、Ｒ２＝０．２５ｍｍ、Ｗ１＜Ｗ２である。
（２）比較例１は、ローラ本体の外周面に図３に示す凸部（凸条）１３および凹部（凹溝）１４が形成されたものである。
（３）比較例２は、ローラ本体の外周面に凸部（凸条）および凹部（凹溝）を形成せず、外周面を研磨したものとした。 Of the created evaluation samples,
(1) In the example, convex portions (ridges) 13 and concave portions (concave grooves) 14 shown in FIG. 2 are formed on the outer peripheral surface of the roller body, and W1 = 0.225 mm and H = 0.16 mm. , R1 = 0.1 mm, R2 = 0.25 mm, and W1 <W2.
(2) In Comparative Example 1, convex portions (projections) 13 and concave portions (concave grooves) 14 shown in FIG. 3 are formed on the outer peripheral surface of the roller body.
(3) In Comparative Example 2, the outer peripheral surface was polished without forming convex portions (projections) and concave portions (concave grooves) on the outer peripheral surface of the roller body.
　［試験方法］
　市販のプリンタに、上記で作製した紙送りローラを組み込み、適切な用紙を選択して通紙試験を行った。
　１０００枚、３０００枚、５０００枚、１００００枚、２００００枚、以下１００００枚毎試験を中断し、紙送りローラの摩擦係数を測定した。通紙不良が発生した時点で試験を終了し、通紙枚数を記録した。 [Test method]
The paper feeding roller prepared above was incorporated into a commercially available printer, and an appropriate paper was selected to perform a paper passing test.
The test was interrupted every 1000 sheets, 3000 sheets, 5000 sheets, 10000 sheets, 20000 sheets, and 10000 sheets thereafter, and the coefficient of friction of the paper feed roller was measured. The test was terminated when a paper passing failure occurred and the number of papers passed was recorded.
　［試験結果］
　同一材料において、（１）本発明の特徴をもつローレット紙送りローラ、（２）図３に示すＲで構成されたローレット紙送りローラ、（３）研磨仕様の紙送りローラのそれぞれの通紙性能比較を行った。 [Test results]
In the same material, (1) a knurled paper feed roller having the features of the present invention, (2) a knurled paper feed roller constituted by R shown in FIG. 3, and (3) a paper feed roller having a polishing specification. A comparison was made.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　本発明の特徴をもつ紙送りローラを用いることで、従来の紙送りローラに対して通紙性能の向上を確認できた。
　この発明は、上記実施例に限定されるものではなく、特許請求の範囲に記載された事項の範囲で種々の設計変更を施すことが可能である。 By using the paper feed roller having the characteristics of the present invention, it was confirmed that the paper feeding performance was improved with respect to the conventional paper feed roller.
The present invention is not limited to the above-described embodiments, and various design changes can be made within the scope of the matters described in the claims.
１０　紙送りローラ
１１　ローラ本体
１１Ｓ　外周面
Ｒ　　　周方向
１３　　凸部（凸条）
１４　　凹部（凹溝） DESCRIPTION OF SYMBOLS 10 Paper feed roller 11 Roller main body 11S Outer peripheral surface R The circumferential direction 13 Convex part (convex strip)
14 Concave (concave groove)

Claims (7)

  1. 　弾性材料によって筒状に一体に形成されたローラ本体を備え、
    　前記ローラ本体の外周面に、ローラ本体の軸方向に延びるように、かつ、周方向に一定幅の凸部と凹部とが交互に現れるように多数の凸条および凹溝が形成された紙送りローラであって、
    　前記凸部は、隣接する両側の凹部と所定の曲率半径のアール状の湾曲線でつながっており、かつ、前記凸条は、前記ローラ本体の外周面に沿った平坦な頂面を有していて、
    　前記凹部は、前記凸部とつながる湾曲線よりも曲率半径の大きな円弧によって形成されていることを特徴とする、紙送りローラ。     Comprising a roller body integrally formed in a cylindrical shape by an elastic material;
    A paper feed in which a large number of ridges and grooves are formed on the outer peripheral surface of the roller main body so as to extend in the axial direction of the roller main body and so that convex portions and concave portions having a constant width appear alternately in the circumferential direction. Laura,
    The convex portion is connected to adjacent concave portions on both sides by a rounded curved line having a predetermined radius of curvature, and the convex strip has a flat top surface along the outer peripheral surface of the roller body. And
    The paper feed roller, wherein the concave portion is formed by an arc having a larger radius of curvature than a curved line connected to the convex portion.
  2. 　前記凸条に形成された平坦な頂面は、その幅（前記ローラ本体の外周面方向に沿った幅）がＷ１であり、前記凹溝の幅（前記ローラ本体の外周面方向に沿った幅）がＷ２であり、
    　　Ｗ１≦Ｗ２
    の関係を満たすことを特徴とする、請求項１記載の紙送りローラ。     The flat top surface formed on the ridge has a width (width along the outer peripheral surface direction of the roller main body) of W1, and the width of the concave groove (width along the outer peripheral surface direction of the roller main body). ) Is W2,
    W1 ≦ W2
    The paper feed roller according to claim 1, wherein the relationship is satisfied.
  3. 　前記平坦な頂面の幅Ｗ１は、０．１～０．３ｍｍであることを特徴とする、請求項２記載の紙送りローラ。 3. The paper feed roller according to claim 2, wherein a width W1 of the flat top surface is 0.1 to 0.3 mm.
  4. 　前記凸部と前記凹部とは、その高さの差が０．１～０．２ｍｍであることを特徴とする、請求項３記載の紙送りローラ。 The paper feed roller according to claim 3, wherein the height difference between the convex portion and the concave portion is 0.1 to 0.2 mm.
  5. 　前記凹部、凸部および凹部でつながる１組の凹凸凹部において、一方の凹部の中央から他方の凹部の中央までの長さは、０．５～１．０ｍｍであることを特徴とする、請求項３または４に記載の紙送りローラ。 The set of concave and convex portions connected by the concave portion, the convex portion, and the concave portion, wherein the length from the center of one concave portion to the center of the other concave portion is 0.5 to 1.0 mm. The paper feed roller according to 3 or 4.
  6. 　請求項１に記載の紙送りローラを備えることを特徴とする画像形成装置。 An image forming apparatus comprising the paper feed roller according to claim 1.
  7. 　前記画像形成装置は、用紙分離装置としてＦＲＲ方式のものが採用されており、
    　前記紙送りローラは、前記用紙分離装置におけるフィードローラとして採用されていることを特徴とする、請求項６記載の画像形成装置。     The image forming apparatus employs an FRR system as a paper separating apparatus,
    The image forming apparatus according to claim 6, wherein the paper feed roller is employed as a feed roller in the paper separation device.
PCT/JP2015/051715 2014-03-18 2015-01-22 Paper feed roller and image forming apparatus WO2015141270A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014055333A JP2015178392A (en) 2014-03-18 2014-03-18 Sheet feed roller and image formation device
JP2014-055333 2014-03-18

Publications (1)

Publication Number Publication Date
WO2015141270A1 true WO2015141270A1 (en) 2015-09-24

Family

ID=54144250

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/051715 WO2015141270A1 (en) 2014-03-18 2015-01-22 Paper feed roller and image forming apparatus

Country Status (2)

Country Link
JP (1) JP2015178392A (en)
WO (1) WO2015141270A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018043852A (en) * 2016-09-14 2018-03-22 住友ゴム工業株式会社 Sheet feeding roller and image formation apparatus having the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006248689A (en) * 2005-03-10 2006-09-21 Oki Data Corp Medium feeder, and image forming device
JP2014034428A (en) * 2012-08-07 2014-02-24 Sumitomo Rubber Ind Ltd Paper feed roller and image formation device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006248689A (en) * 2005-03-10 2006-09-21 Oki Data Corp Medium feeder, and image forming device
JP2014034428A (en) * 2012-08-07 2014-02-24 Sumitomo Rubber Ind Ltd Paper feed roller and image formation device

Also Published As

Publication number Publication date
JP2015178392A (en) 2015-10-08

Similar Documents

Publication Publication Date Title
JP5678010B2 (en) Paper feed roller and image forming apparatus
JP2007137539A (en) Paper feeding roller
WO2015141270A1 (en) Paper feed roller and image forming apparatus
JP6146900B2 (en) Paper feed roller
JP3744336B2 (en) Retard roller and paper feeder
JP2017065907A (en) Paper feeding roller, and image formation device equipped with paper feeding roller
JP2012180144A (en) Paper feed mechanism
JPH08225164A (en) Paper peeding roller and paper feeder
JP5690160B2 (en) Paper feed roller
JP4575855B2 (en) Paper feeding mechanism and image forming apparatus
JP4040546B2 (en) Sheet material feeding apparatus and image forming apparatus having the apparatus
JP7374506B2 (en) Paper feeding device
US20230264907A1 (en) Paper feeding roller and paper feeding device
US7631864B1 (en) Catch tray for document production device
EP2650243A2 (en) Sheet separation pad and image forming apparatus
JP3619097B2 (en) Sheet conveying roller and sheet feeding apparatus
JP2018043851A (en) Sheet feeding roller and image formation apparatus having the same
JP2001199569A (en) Deformed roller for paper feed
JP2009256034A (en) Roller
JP2017039593A (en) Sheet feeding device and printer
JP2003081458A (en) Paper sheet separating mechanism for paper feeding device
JP3888849B2 (en) Separating paper feeder and image forming apparatus
JP2018043852A (en) Sheet feeding roller and image formation apparatus having the same
JPH10299762A (en) Roller of elastic body
JP4634844B2 (en) Transfer roller

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15765047

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15765047

Country of ref document: EP

Kind code of ref document: A1