EP0492936B1 - Gummielement für Vorrichtung zum Zuführen von Papierblättern - Google Patents

Gummielement für Vorrichtung zum Zuführen von Papierblättern Download PDF

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Publication number
EP0492936B1
EP0492936B1 EP19910311705 EP91311705A EP0492936B1 EP 0492936 B1 EP0492936 B1 EP 0492936B1 EP 19910311705 EP19910311705 EP 19910311705 EP 91311705 A EP91311705 A EP 91311705A EP 0492936 B1 EP0492936 B1 EP 0492936B1
Authority
EP
European Patent Office
Prior art keywords
rubber
deniers
friction coefficient
short fibers
paper
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP19910311705
Other languages
English (en)
French (fr)
Other versions
EP0492936A2 (de
EP0492936A3 (en
Inventor
Yasuchika Ito
Hiroaki C/O Sumitomo Gomu Kogyo K.K. Tanaka
Hitoshi Itani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
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 Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP0492936A2 publication Critical patent/EP0492936A2/de
Publication of EP0492936A3 publication Critical patent/EP0492936A3/en
Application granted granted Critical
Publication of EP0492936B1 publication Critical patent/EP0492936B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/52—Friction retainers acting on under or rear side of article being separated
    • B65H3/5207—Non-driven retainers, e.g. movable retainers being moved by the motion of the article
    • B65H3/5215—Non-driven retainers, e.g. movable retainers being moved by the motion of the article the retainers positioned under articles separated from the top of the pile
    • B65H3/5223—Retainers of the pad-type, e.g. friction pads

Definitions

  • the present invention relates to a rubber member for a paper feeding device and more particularly it relates to improvements in misfeed-preventive rubber pad or rubber roller used in a paper feeding device, such as a copying machine, facsimile device or printer.
  • a member 2 such as a misfeed-preventive rubber pad or rubber roller, is disposed in opposed relation to a feed roller 1, as shown in Fig. 1, to feed a number of paper sheets one by one.
  • Fig. 1 shows a rubber pad as a misfeed-preventive rubber member 2.
  • misfeed-preventive rubber member 2 As said misfeed-preventive rubber member 2, it has been common practice to use urethane, which is wear-resistant, a combination of urethane and cork, natural rubber, chloroprene or the like.
  • ⁇ F is the friction coefficient between the paper feed roller 1 and the paper sheet 3
  • ⁇ R is the friction coefficient between the misfeed-preventive rubber member 2 and the paper sheet 3
  • ⁇ p is the friction coefficient between the paper sheets 3.
  • ⁇ F and ⁇ P for the currently used members were measured and it was found that ⁇ p was 0.3 - 0.6, ⁇ F was 1.5 - 2.5; therefore, it is desirable that ⁇ R be 0.7 - 1.2 Further, in the case of an OHP (overhead projector) film, since ⁇ p is 0.3 - 1.5 and ⁇ F is 2.5 - 3.0, it is desirable that ⁇ R be 1.7 - 2.4.
  • the conventional misfeed-preventive rubber member 2 made of urethane, combination of urethane and cork, natural rubber, chloroprene or the like presents the following problems.
  • Patent Abstracts of Japan vo. 14, no. 375 discloses a rubber member for a paper feeding device in which short fibers are added to the rubber composition of the rubber member and some of the short fibers are exposed on the surface of the rubber member.
  • the present invention has been accomplished as a result of studies of the troubles described above and its object is to provide a rubber member for a paper feeding device, wherein the friction coefficient remains unchanged for a long period of time, there is no abnormal sound produced during the feeding of paper sheets and less swelling takes place during contact with a paper feed roller.
  • a rubber member for a paper feeding device in which short fibers are added to the rubber composition of the rubber member and some of said short fibers are exposed on the surface of the rubber member, characterized in that 0.5 - 5 parts by weight of short fibers having a thickness of not more than 15 deniers and a length not more than 5 mm are added to 100 parts by weight of the rubber composition which comprises a metal oxide and acrylic acid and is vulcanized.
  • a rubber composition comprising a metal oxide and acrylic acid and vulcanized has been found as a rubber composition less liable to attract paper powder.
  • the above rubber composition is less liable to attract paper powder and provides a friction coefficient which remains unchanged for a long period of time, the initial friction coefficient is high and undergoes a great change, as shown in Fig. 2. Therefore, it is suitable for a paper feeding device only on the condition that paper sheets which provide a high friction coefficient with respect to rubber, such as OHP films, are not used; however, when OHP films have to be fed, the relation (1) is not maintained, making it impossible to attain smooth feeding.
  • the initial friction coefficient can be decreased by adding short fibers to said rubber composition and that the effect of decreasing the friction coefficient can be limited to the initial period by selecting a thickness and length for the short fibers which cause the latter to gradually wear as the feeding of paper sheets proceeds (see experimental data in Figs. 3 through 14).
  • the thickness of the short fibers is desirably not more than 15 deniers. If it exceeds 15 deniers, the fibers form a member which hardly wears and which provides an excessively low friction coefficient. Further, it is desirable that the length of the short fibers be not more than 5 mm.
  • the fibers form a member which hardly wears and which provides an excessively low friction coefficient.
  • the material of the short fibers is not particularly restricted; however, since they are heated to 140 - 190°C during vulcanization reaction, they are required to have a melting point above the reaction temperature.
  • the optimum amount of short fibers to be added is 0.5 - 5 parts by weight with respect to 100 parts by weight of polymer.
  • the reason for restricting the amount of short fibers to 0.5 - 5 parts by weight with respect to 100 parts by weight of polymer is that if it exceeds 5 parts by weight, wearing proceeds so slowly that the friction coefficient does not become stable but that if it is less than 0.5 parts by weight, the decreases in the initial friction coefficient is so small that the friction coefficient does not become stable, either.
  • a rubber member for a paper feeding device which stabilizes the friction coefficient for a long period of time, as shown in Fig. 15.
  • a rubber member for a paper feeding device which provides a stable friction coefficient is obtained, but it has to be adjusted to provide an optimum friction coefficient according to the type and design (load, and method of installation) of the paper feeding device. If the friction coefficient is too high, OHP films and coated paper sheets creak, while if it is too low, misfeed takes place.
  • the friction coefficient can be adjusted by adding short fibers as required. That is, short fibers are exposed on the surface and these exposed short fibers provide a suitable friction coefficient to prevent the creaking and misfeed of OHP films and coated paper sheets.
  • said rubber composition is oil-resistant rubber comprising acrylonitrile butadiene copolymer rubber such that the bound acrylonitrile content thereof amounts to 10 to 35%.
  • NBR acrylonitrile butadiene rubber
  • Various grades of NBR are marketed; however, in order to solve problems (3) and (4), it is necessary to select a single NBR, a mixture of NBRs whose acrylonitrile contents differ, or a mixture of NBR and diene type rubber in which the bound acrylonitrile content of the polymer is 10 - 35%.
  • the diene type rubber mentioned herein refers to NR (natural rubber), IR (isoprene rubber), SBR (styrene-butadiene), BR (butadiene rubber), IIR (butyl rubber), CR (chloroprene), or NBR.
  • the reason for restricting the bound acrylonitrile content to 10 - 35% is that if it is below 10%, the requirement for oil resistance cannot be satisfied and that if it exceeds 35%, the glass transition point increases to cause creaking.
  • a single NBR, a mixture of NBRs, or a mixture of NBR and diene type rubber which provides the required bound acrylonitrile content will be selected.
  • EPDM ethylene propylene rubber
  • some of the short fibers exposed on the rubber member surface suitably decrease the excessive surface friction coefficient which appears in the initial period of the paper feeding operation and gradually wear as paper sheets are passed, whereby the friction coefficient is maintained at a suitable value. It is possible to impart a better oil resistance to the oil-resistant rubber so as to decrease the amount of swelling from the paper feed roller. Further, by adding cork, it is possible to adjust the friction coefficient to provide a suitable surface friction resistance. Further, since the oil-resistant rubber contains diene type rubber or a single NBR whose bound acrylonitrile content is 10 - 35%, it is possible to decrease creaking while providing oil resistance. Further, by the combination of acrylic acid and a metal oxide, it is possible to make the paper powder less sticky. It goes without saying that the present roller member may be utilized to form a roller and use it as a separating roller for paper delivery and paper feed between the rollers.
  • Rubber compositions obtained by combinations in embodiments A - X shown in Table 1 below were used to form misfeed-preventive rubber members and friction coefficients which appeared in the initial period, the second period which started at the end of passage of 1000 paper sheets, and the third period which started at the end of passage of a hundred thousand paper sheets were measured. The result is shown also in Table 1.
  • the rubber member of the present invention stabilizes the friction coefficient for a long time, eliminates abnormal sounds and is superior in oil resistance; therefore, less welling occurs even if it contact a paper feed roller of Polynorbornene type rubber at all times. Therefore, a reliable, high quality practical rubber member for a paper feeding device can be provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Handling Of Cut Paper (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Facsimiles In General (AREA)

Claims (2)

  1. Gummielement (2) für eine Papierzuführvorrichtung, bei dem kurze Fasern der Gummizusammensetzung des Gummielementes (2) zugefügt sind und einige der kurzen Fasern an der Oberfläche des Gummielementes (2) exponiert sind,
    dadurch gekennzeichnet, daß 0,5 - 5 Gewichtsanteile an kurzen Fasern mit einer Dicke von nicht mehr als 15 Denier und einer Länge von nicht mehr als 5 mm 100 Gewichtsanteilen einer Gummimischung zugesetzt werden, die ein Metalloxid und Acrylsäure enthält und vulkanisiert ist.
  2. Gummielement (2) für eine Papierzuführvorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß die Gummizusammensetzung ein ölresistentes Gummi ist, welches Butadien-Acrylnitril-Kopolymer-Kautschuk enthält, so daß der Anteil an abgebundenen Acrylnitril 10 bis 35% beträgt.
EP19910311705 1990-12-20 1991-12-17 Gummielement für Vorrichtung zum Zuführen von Papierblättern Expired - Lifetime EP0492936B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2413237A JPH075200B2 (ja) 1990-12-20 1990-12-20 給紙装置用ゴム部材
JP413237/90 1990-12-20

Publications (3)

Publication Number Publication Date
EP0492936A2 EP0492936A2 (de) 1992-07-01
EP0492936A3 EP0492936A3 (en) 1992-12-09
EP0492936B1 true EP0492936B1 (de) 1994-12-07

Family

ID=18521917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910311705 Expired - Lifetime EP0492936B1 (de) 1990-12-20 1991-12-17 Gummielement für Vorrichtung zum Zuführen von Papierblättern

Country Status (3)

Country Link
EP (1) EP0492936B1 (de)
JP (1) JPH075200B2 (de)
DE (1) DE69105708T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3977819B2 (ja) * 2004-03-26 2007-09-19 住友ゴム工業株式会社 紙葉類重送防止部材

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192497A (en) * 1974-04-26 1980-03-11 Xerox Corporation Composition for the surface of sheet separating devices
JPS60262748A (ja) * 1984-06-11 1985-12-26 Sumitomo Rubber Ind Ltd 給紙装置の重送防止用ゴム部材
JPH0832801B2 (ja) * 1987-03-27 1996-03-29 日本ゼオン株式会社 ゴム組成物
JP2652562B2 (ja) * 1988-11-14 1997-09-10 バンドー化学株式会社 紙送り重送防止用ゴム部材

Also Published As

Publication number Publication date
EP0492936A2 (de) 1992-07-01
JPH075200B2 (ja) 1995-01-25
DE69105708T2 (de) 1995-08-31
DE69105708D1 (de) 1995-01-19
EP0492936A3 (en) 1992-12-09
JPH04251050A (ja) 1992-09-07

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