JPH09286528A - Paper sheet supply member and paper sheet supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper sheet supply member having good workability and machinability and excellent in paper sheet supply and paper sheet feeding property from view of stabilization and low pollution to the counterpart material like a paper sheet, etc., pinched between rollers, in the case of a paper sheet supply member mounted on such a device as having a paper sheet supply mechanism. SOLUTION: In various sorts of a paper sheet supply member loaded on a device having a paper sheet supply mechanism, at least one part of the paper sheet supply member consists of a low molecule holding medium compound A including a low molecular material and a medium material and ethylenepropylene copolymer rubber B. And the low molecular material has its viscosity less than 5×10<5> C.P at 100 deg.C, a difference between solubility parameter value of the low molecular material and the medium material is less than 3.0, the weight ratio of the low molecular material to the medium material is more than 1.0, a difference between respective solubility parameter values of the low molecular material and ethylenepropylene copolymer rubber B is less than 40 and Mooney viscosity of ethylenepropylene copolymer rubber is more than 70 according to JIS6300 specification.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding member such as a sheet feeding roller (including thin leaf-shaped material other than paper) or a friction separating member, and a sheet feeding device using the same, and more particularly to a copying machine. , Laser printers, facsimile machines and other office automation equipment,
Alternatively, in an apparatus having various sheet feeding mechanisms such as an automatic teller machine (ATM), a money changer, a counter, a vending machine, and a cash dispenser (CD), the apparatus can prevent contamination of sheets and sheet feeding characteristics. The present invention also relates to a sheet feeding member such as a sheet feeding roller and a sheet feeding device which have excellent durability.

[0002]

2. Description of the Related Art The above-mentioned paper feeding roller or friction separating member used in a paper feeding mechanism mounted in a paper feeding device such as a copying machine has excellent paper feeding characteristics, Various shapes and materials are provided in order to prevent the mating material such as the sandwiched paper from being contaminated and to have excellent durability.

Materials used for the paper feed roller include:
Since the amount of friction with paper is required, the rubber hardness is
It is indispensable that the JIS-A scale has a low hardness of about 20 to 40 and that the abrasion is small against repeated paper feeding. As a material that meets this requirement,
Polynorbornene rubber has been used, but now that it is required to have higher durability, it is not possible to meet the demand.

Therefore, EPDM and EPR having excellent weather resistance.
A material using ethylene-propylene copolymer rubber (hereinafter referred to as “EP rubber”) such as is proposed, but if an attempt is made to obtain a rubber having JIS-A hardness of 40 or less, a large amount of oil is obtained. It is necessary to add a softening agent such as etc., which not only deteriorates the processability in terms of rubber production extremely, but also remarkably deteriorates various properties such as elasticity, mechanical strength and abrasion resistance as a rubber. Further, there is a problem that a large amount of the blended softening agent bleeds on the roller surface to contaminate the paper, or the paper cannot be fed by sliding.

Further, among EP rubbers having excellent weather resistance,
It is generally known that in order to select a material having excellent wear resistance, one having a large molecular weight (large Mooney viscosity) and a high ethylene content may be selected. The system rubber has a problem that a vicious cycle is repeated because it becomes necessary to add a larger amount of oil and other softening agents because the rubber hardness is further increased.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is mainly composed of EP rubber having excellent weather resistance, and has elasticity, mechanical strength, wear resistance, etc. as a rubber. Has a high coefficient of friction even after long-term use, and has a physical property when a large amount of oil is used to obtain a low hardness rubber material suitable for a sheet feeding member such as a sheet feeding roller or a friction separating member. It is another object of the present invention to provide a paper feeding member and a paper feeding device, in which the drawbacks of the prior art in workability and workability are significantly improved, and there is no contamination of the other party such as paper sandwiched between rollers.

[0007]

The sheet feeding member according to claim 1 of the present invention is a sheet feeding member mounted in an apparatus having a sheet feeding mechanism, wherein at least a part of the sheet feeding member has a low molecular weight. Material containing a low molecular weight holding medium material composite (A) containing a material and a medium material, and an ethylene propylene copolymer rubber (B). The low molecular weight material is 5 × 10 at 100 ° C. ^{2. It} has a viscosity of ⁵ centipoise or less, and the difference in solubility parameter-value between the low molecular weight material and the medium material is 3.
0 or less, and the weight ratio of the low molecular weight material and the medium material is 1.0.
As described above, the difference in solubility parameter value between the low molecular weight material and the ethylene-propylene copolymer rubber (B) was 4.0.
And the Mooney viscosity of the ethylene-propylene copolymer rubber is 70 or more in accordance with JIS6300 standard.

The paper feeding member according to the second aspect of the present invention is characterized in that the ethylene-propylene copolymer rubber (B) has an ethylene content of 50 to 75% by weight.

The paper feeding member according to claim 3 of the present invention is characterized in that the rubber composition contains 0.2 to 1.0% by weight of sulfur.

According to a fourth aspect of the present invention, in the sheet feeding member, the low molecular weight holding medium composite (A) is contained in an amount of 10 to 20 relative to 100 parts by weight of the ethylene-propylene copolymer rubber (B).
It is characterized in that 0 part by weight was added.

The sheet feeding member according to claim 5 of the present invention is characterized in that the low molecular weight material is a paraffin type or a naphthene type.

According to a sixth aspect of the present invention, there is provided a sheet feeding device that rotates in a sheet feeding direction, a reverse roller that is provided by sandwiching a sheet path and that rotates in a counter sheet feeding direction, and a stacking sheet of paper. In a paper feeding device having a pickup roller for feeding an upper sheet, at least one roller of each paper feeding roller mounted in the paper feeding device is at least one of the above-mentioned items 1 to 5. It is characterized in that it comprises a paper feed member.

According to a seventh aspect of the present invention, there is provided a sheet feeding device having a sheet feeding roller for feeding a sheet and a friction separating member provided in the vicinity of the sheet feeding roller. The sheet feeding roller or the friction separating member mounted on the apparatus is formed of the sheet feeding member according to any one of claims 1 to 5.

[0014]

That is, the inventors of the present invention have conducted earnest studies on a sheet feeding member and a sheet feeding device, and as a result, the EP rubber (B) having a Mooney viscosity of 70 or more according to JIS 6300 standard is a low molecular weight material. By blending the low molecular weight holding medium material composite (A) containing a rubber and a medium material, the rubber hardness is 20 to 40 ° on the JIS-A scale while maintaining high wear resistance.
The inventors have found that a sheet feeding member having a low hardness can be obtained, and have completed the present invention. Although the detailed mechanism is not clear, when the dispersion state of the oil in the EP rubber is considered from a microscopic viewpoint, the conventional EP
In the case where the oil is mixed with the system rubber, the oil is simply dispersed in the rubber, and even if it seems that the EP system rubber and the oil are evenly dispersed, the state is close to phase separation. On the other hand, in the rubber composition of the present application, a low molecular weight holding medium material is also prepared in the form of the low molecular weight holding medium composite (A) holding a large amount of oil and then mixed with the EP rubber. It is considered that oil bleeding can be suppressed while maintaining a low hardness because it is dispersed in a state close to the composite (A).

Hereinafter, the present invention will be described in detail. The low molecular weight material of the present invention has a viscosity of 5 × 10 at 100 ° C.
The material is ⁵ centipoise or less, preferably 1 × 10 ⁵ centipoise or less. From the viewpoint of the molecular weight, the number average molecular weight of the low molecular weight material is 20,000 or less, preferably 10,000 or less, more preferably 5,000 or less. Usually, a liquid or liquid material at room temperature is preferably used. Further, hydrophilic or hydrophobic low molecular weight materials can also be used.

As the low molecular weight material, any material can be used as long as it satisfies the above-mentioned conditions, and there is no particular limitation, but examples thereof include the following materials.

Softening material: Softening material for various types of rubber or resin such as mineral oil type, vegetable oil type and synthetic type. Examples of mineral oil-based oils include process oils such as aromatic oils, naphthene oils, and paraffin oils. Examples of vegetable oils include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil, wood wax, pine oil, olive oil and the like.

Plasticizer: Various ester plasticizers such as phthalic acid ester, mixed phthalic acid ester, aliphatic dibasic acid ester, glycol ester, fatty acid ester, phosphoric acid ester, stearic acid ester, epoxy plasticizer, etc. Plasticizer or phthalate system for plastics,
Adipate-based, sebacate-based, phosphate-based, polyether-based, polyester-based, etc. plasticizers for NBR.

Tackifier: Coumarone resin, Coumarone-
Various tackifiers (tackifiers) such as indene resin, phenol terpene resin, petroleum hydrocarbons and rosin derivatives.

Oligomer: Crown ether, fluorinated oligomer, polyisobutylene, xylene resin, chlorinated rubber, polyethylene wax, petroleum resin, rosin ester rubber, polyalkylene glycol diacrylate, liquid rubber (polybutadiene, styrene-butadiene rubber,
Various oligomers such as butadiene-acrylonitrile rubber, polychloroprene, etc.), silicone-based oligomers, and poly-α-olefins.

Lubricants: Hydrocarbon lubricants such as paraffin and wax, fatty acid lubricants such as higher fatty acids and oxyfatty acids, fatty acid amide lubricants such as fatty acid amides and alkylenebisfatty acid amides, fatty acid lower alcohol esters, fatty acid polyhydric alcohol esters. , Ester lubricants such as fatty acid polyglycol ester, fatty alcohol,
Various lubricants such as alcohol-based lubricants such as polyhydric alcohol, polyglycol and polyglycerin, metal soaps, mixed lubricants.

In addition, latex, emulsion, liquid crystal, bituminous composition, clay, natural starch, sugar, inorganic silicon oil, phosphazene and the like are also suitable as the low molecular weight material. Further, animal oils such as beef oil, pig oil, horse oil, bird oil or fish oil: honey, fruit juice, or dairy products such as chocolate and yogurt, hydrocarbons, halogenated hydrocarbons, alcohols, phenols, ethers. -Based, acetal-based, ketone-based, fatty acid-based, ester-based, nitrogen compound-based, sulfur compound-based organic solvents: or various medicinal components, soil modifiers, fertilizers, petroleum,
Water and aqueous solutions are suitable. These components may be used alone or in combination of two or more.

The low molecular weight material is used for the required properties, applications, and
Further, the optimum one is selected in consideration of compatibility with other components such as the medium material and EP rubber (B) according to the present invention, and is used in an optimum amount. Mineral oil is preferable from the viewpoint of contamination to the member, and particularly paraffinic or naphthene-based process oil containing no aromatic component is preferable from the viewpoint of compatibility with the medium material and the EP rubber (B).

The medium material in the present invention is a low molecular weight material or EP.
It is a material having a function as a medium with the system rubber (B), and is an important component for achieving the object of the present invention. For more information,
A low molecular weight material-holding medium composite that holds a large amount of low molecular weight material by using a large amount of low molecular weight material and a medium material in order to enable a uniform composition of a large amount of low molecular weight material and EP rubber (B). Object (A)
Is obtained first, and the desired rubber composition is obtained by combining this with EP rubber (B). Even if the low molecular weight material, the medium material and the EP rubber (B) are mixed at the same time, a uniform and low hardness rubber composition cannot be obtained. Further, even if a large amount of low molecular weight material and EP rubber (B) are directly mixed to obtain an EP based rubber (B) containing a large amount of low molecular weight material, the low molecular weight material cannot be mixed uniformly, and Frequent bleeding often occurs, and the desired low-hardness rubber composition cannot be obtained. Here, "holding" the low molecular weight material means that the low molecular weight material uniformly disperses the medium material and the EP rubber (B) and does not bleed, or bleeding is suppressed. . Of course, the degree of bleeding can be easily controlled depending on the purpose of the rubber composition. Finally, this low molecular weight material holding medium material composite (A)
However, it is not always clear that the uniform mechanism of uniformly dispersing in the EP rubber (B) when mixed with the EP rubber (B) is, but most of the composite is divided into fine particles in the EP rubber (B). It is considered to be retained.

The medium material according to the present invention may be any material as long as it has a function as described above and forms a composite material that holds a large amount of low molecular weight material.
A thermoplastic polymer material or various materials having the polymer material as a constituent element is used.

Examples of the medium material include styrene type (butadiene styrene type, isoprene styrene type, etc.), vinyl chloride type, olefin type (butadiene type, isoprene type,
(Ethylene propylene type, etc.), ester type, amide type, urethane type, and other thermoplastic elastomers, and their hydrogenated and other modified products, styrene type, ABS
Type, olefin type (ethylene type, propylene type, ethylene propylene type, ethylene styrene type, propylene styrene type, etc.), vinyl chloride type, acrylic acid ester type (methyl acrylate type, etc.), methacrylic acid ester type (methyl methacrylate type) Etc.), carbonate type, acetal type, nylon type, halogenated polyether type (chlorinated polyether type, etc.), halogenated olefin type (tetrafluoroethylene type, fluorinated-ethylene chloride type, fluorinated ethylene propylene type, etc.) , Thermoplastic resins such as cellulose-based (acetyl cellulose-based, ethyl cellulose-based), vinylidene-based, vinyl butyral-based, alkylene oxide-based (propylene oxide-based, etc.), and rubber-modified products of these resins.

As a concrete thermoplastic polymer material, it is particularly preferable to use a material having a portion which easily forms a hard block such as a crystal structure or an agglomerate structure, and a soft block such as an amorphous structure together. Specifically, the following are mentioned.

A block copolymer of crystalline polyethylene obtained by hydrogenating a block copolymer of polybutadiene and a butadiene-styrene random copolymer, and an ethylene / butylene-styrene random copolymer. Obtained by hydrogenating a block copolymer of polybutadiene and polystyrene, or a block copolymer of polybutadiene or an ethylene-butadiene random copolymer and polystyrene, for example, a block copolymer of crystalline polyethylene / butylene and polystyrene. Polymer. A block copolymer in which crystalline polyethylene is linked to one or both ends of an ethylene / butylene copolymer. Ethylene propylene rubber (EPR), ethylene propylene diene terpolymer rubber. Of these, particularly block copolymers are preferable.

A part of the low molecular weight material, the medium material and the low molecular weight holding medium material composite (A) according to the present invention is disclosed in JP-A-5-239.
It is described in Japanese Patent No. 256 and Japanese Patent Laid-Open No. 5-194763. The medium material having the three-dimensional continuous net-like skeleton structure disclosed in this publication is also suitably used as a typical one in the present invention.

The medium material according to the present invention is not particularly limited, but can be used in a usual bulk form, granular form, gel form, foam form, non-woven fabric form or the like. It can also be used in a form in which a capsule containing a low molecular weight material is incorporated.

In order to obtain the low molecular weight holding medium material composite (A) containing a large amount of low molecular weight material and medium material, the difference in solubility parameter value between the low molecular weight material and the medium material used is 3.0 or less. Both materials are selected so that it is preferably 2.5 or less. If this difference exceeds 3.0, it is difficult to hold a large amount of low molecular weight material from the viewpoint of compatibility, which is an obstacle to lowering the hardness of the rubber composition, and bleeding of the low molecular weight material is likely to occur, which is not preferable. .

Further, the weight ratio of the low molecular weight material to the medium material is 1.
It is 0 or more, preferably 2.0 or more, and more preferably 3.0 or more. If this weight ratio is less than 1.0, it becomes difficult to obtain a rubber composition having a low hardness, and the present invention cannot be achieved.

The method for producing the composite containing the low molecular weight material and the medium material may be an optimum method including a known method depending on the types, characteristics, mixing ratios of the low molecular weight material and the medium material, and is not particularly limited. The method described in JP-A-5-239256 is one of the methods.

The EP rubber (B) according to the present invention includes, for example, EPR and EPDM, but EPDM is preferable from the viewpoint of environmental conditions and required performance used as a sheet feeding member mounted in a sheet feeding device. , Its Mooney viscosity (ML
_{1 + 4} , 100 ° C., JIS 6300 standard), 70 or more is preferable from the viewpoint of abrasion resistance of the paper feed member roller. Also, E
The ethylene content of the P-based rubber (B) is preferably 50 to 75% by weight from the viewpoint of wear resistance and workability of the sheet feeding member roller.

In the present invention, both materials are selected so that the difference in solubility parameter value between the low molecular weight material and the EP rubber (B) is 4.0 or less, preferably 3.0 or less. The low molecular weight material is mixed with the EP rubber (B) in the form of the low molecular weight material-holding medium composite (A), but in this case also, the compatibility between the low molecular weight material and the EP rubber (B) poses a problem. Become. When the difference in this parameter exceeds 4.0, the low molecular weight material retained in a large amount in the composite is difficult to retain in the EP rubber (B) from the viewpoint of compatibility, and the hardness of the rubber composition is lowered. It is not preferable because it causes trouble and bleeding of low molecular weight material is likely to occur.

The mixing method of the low molecular weight material-holding medium composite (A) and the EP rubber (B) according to the present invention is not limited, but it is most suitable including a known method depending on the characteristics of both and the mixing ratio. The method may be adopted. Thereby, the rubber composition according to the present invention can be easily obtained.

The rubber composition according to the present invention has a low hardness region,
It can be controlled to a desired hardness. For example, it is possible to easily achieve ultra-low hardness of 10 ° or less in Asker C hardness at a measurement temperature of 25 ° C.

The rubber composition according to the present invention contains a vulcanizing agent (sulfur,
Peroxide, etc., vulcanization accelerator (tetramethylthiuram monosulfide (Noccer TS), mercaptobenzothiazole (Noccer M), N-cyclohexyl-
2-benzothiazyl sulfenamide (Nocceller C
Z), diphenylguanidine (Nocceller G), etc., vulcanization aid (ethylene glycol dimethacrylate (EDM)
A), triallyl isocyanurate (TAIC), N,
N'-m-phenylene dimaleimide (Barnock PM)
Etc.), various fillers (carbon black, white carbon, white luster CC, etc.), antioxidants (styrenated phenol (Antage SP-P), 2,6 di-tert-butyl-4-methylphenol (Nocrac 200), Dibutyl hydrogen phosphite (DBP), etc.) and an antistatic agent (conductive carbon (Ketjen Black EC), white conductive powder, etc.) are added and vulcanized to provide the paper feed of the present invention. It is possible to obtain a paper feed roller mounted on the apparatus.

When sulfur is used as the rubber vulcanizing agent, the content of the sulfur alone is 0.2-1.
The range of 0% is preferable, and if it is less than 0.2%, sufficient cross-linking cannot be carried out and wear resistance is remarkably deteriorated. If it exceeds 1.0, unreacted sulfur not used for cross-linking bleeds to the rubber surface. As a result, the coefficient of friction is lowered and the paper feeding performance is deteriorated.

In the rubber composition according to the present invention, the compounding amount of the low molecular weight material-holding medium composite (A) with respect to 100 parts by weight of the EP rubber (B) depends on the workability at the time of manufacturing the paper feeding member and the paper feeding member. From the viewpoint of elasticity, mechanical strength, and wear resistance as
10 to 200 parts by weight or less, preferably 10 to 150 parts by weight, more preferably 20 to 100 parts by weight, whereby the JIS-A hardness of the sheet feeding member is 60 degrees or less, preferably 50 degrees or less, most preferably It is preferably 40 degrees or less, and can be designed and controlled within a range suitable for a sheet feeding member mounted on a sheet feeding device. In addition, below 10 parts by weight,
A paper feed member having a rubber hardness of 60 degrees or less on the JIS-A scale cannot be obtained.

If necessary, the rubber composition according to the present invention may further contain the following fillers. That is, clay, diatomaceous earth, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxides, mica, graphite, scale-like inorganic fillers such as aluminum hydroxide, various metal powders, wood chips, glass powders, ceramic powders Granular or powder solid fillers such as granular or powder polymers,
Other various natural or artificial short fibers, long fibers (for example, straws, hairs, glass fibers, metal fibers, other various polymer fibers, etc.) can be blended.

The constitution of the sheet feeding member according to the present invention is not particularly limited, and may be constituted only by the above-mentioned rubber composition, or may be a laminated structure with an existing rubber material or metal material. You may use it, combining them. In the case of a paper feed roller, for example, as shown in FIG. 1, the shaft 2 is combined with the rubber composition 3 according to the present invention to form a paper feed roller, and then the paper feed device shown in FIG. The rubber composition according to the present invention can be attached to the friction separating member member 12 shown in FIG.

In the paper feeding member according to the present invention, the surface is provided with an abrasion pattern by grinding or polishing, or a special pattern is previously engraved on the surface of the mold and transferred to the surface of the roller to form a pattern on the surface of the roller. Excellent paper feeding characteristics can be imparted by making it.

The sheet feeding member such as the sheet feeding roller according to the present invention is provided with a stable sheet feeding characteristic, and a sheet feeding roller which hardly pollutes a mating material such as paper sandwiched between the rollers is provided. Moreover, since the low molecular weight material-holding medium composite (A) and the EP rubber (B) can be easily mixed in a short time, a paper feed roller excellent in productivity can be provided.

[0045]

The present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

Example 1 EPDM (“EP57C” manufactured by Japan Synthetic Rubber Co., Ltd., solubility parameter = 8.0) 100
Paraffin oil in the weight part ("PW-3 manufactured by Idemitsu Kosan"
2 ", viscosity at 100 ° C: 4.9 centipoise, solubility parameter = 6.8, number average molecular weight = 400) 5
Using 1 part by weight as a low molecular weight material, a crystalline ethylene-ethylene / butylene-crystalline ethylene copolymer polymer (“Dyalon E6100P” manufactured by Japan Synthetic Rubber Co., Ltd., solubility parameter = 7.9, number average molecular weight = 280,000). A low molecular weight retention medium material composite prepared by using 9 parts by weight as a medium material (total 60 parts by weight) was mixed with other general fillers, and 0.3% by weight of sulfur was added as a vulcanizing agent to obtain A rubber roller was prepared by vulcanizing and molding the rubber composition. The EPDM used here has a Mooney viscosity (ML _{1 + 4} , 100
C) of 90 and ethylene content of 72% by weight. Other general fillers compounded here are 5 parts by weight of zinc oxide, 10 parts by weight of calcium carbonate and 1 part by weight of stearic acid.

Example 2 A rubber roller was prepared in the same manner as in Example 1 except that EPDM (“EP37C” manufactured by Japan Synthetic Rubber Co., Ltd., solubility parameter = 8.0) was used.
The Mooney viscosity of the EPDM used here (ML
_{1 + 4} , 100 ° C.) is 100 and the ethylene content is 60% by weight.

Example 3 100 parts by weight of EPDM (“EP57C” manufactured by Japan Synthetic Rubber Co., Ltd.) and 68 parts by weight of paraffin oil (“PW-32” manufactured by Idemitsu Kosan) as a low molecular weight material were used as crystalline ethylene-ethylene / A low molecular weight retention medium composite (total 80 parts by weight) prepared by using 12 parts by weight of butylene-crystalline ethylene copolymer polymer (“Dyalon E6100P” manufactured by Japan Synthetic Rubber Co., Ltd.) as a medium together with other general fillers. A rubber roller was prepared by mixing and vulcanizing and molding a rubber composition obtained by adding 0.3% by weight of sulfur as a vulcanizing agent.

Example 4 100 parts by weight of EPDM (“EP57C” manufactured by Japan Synthetic Rubber Co., Ltd.) and 85 parts by weight of paraffin oil (“PW-32” manufactured by Idemitsu Kosan) as a low molecular weight material were used as crystalline ethylene-ethylene / A low molecular weight retention medium material composite (total 100 weight parts) prepared by using 15 weight parts of butylene-crystalline ethylene copolymer polymer (“Dyalon E6100P” manufactured by Japan Synthetic Rubber Co., Ltd.) as a media material together with other general fillers. Mix and add 0.3% sulfur as a vulcanizing agent.
A rubber roller was prepared by vulcanizing and molding the rubber composition obtained by adding the composition in an amount of 1% by weight.

Example 5 100 parts by weight of EPDM (“EP57C” manufactured by Japan Synthetic Rubber Co., Ltd.) and 136 parts by weight of paraffin oil (“PW-32” manufactured by Idemitsu Kosan) as a low molecular weight material were used as crystalline ethylene-ethylene / A low molecular weight holding medium composite (total 160 parts by weight) prepared by using 24 parts by weight of butylene-crystalline ethylene copolymer polymer (“Dyalon E6100P” manufactured by Japan Synthetic Rubber Co., Ltd.) as a medium material together with other general fillers. Mix and add 0.3% sulfur as a vulcanizing agent.
A rubber roller was prepared by vulcanizing and molding the rubber composition obtained by adding the composition in an amount of 1% by weight.

Example 6 EPR ("EP07P" manufactured by Japan Synthetic Rubber Co., Ltd., solubility parameter = 8.0) 100
Paraffin oil in the weight part ("PW-3 manufactured by Idemitsu Kosan"
2 ") 51 parts by weight as a low molecular weight material, crystalline ethylene-
Other general filling with a low molecular weight holding medium material composite (total 60 parts by weight) prepared by using 9 parts by weight of ethylene / butylene-crystalline ethylene copolymer polymer (“Dyalon E6100P” manufactured by Japan Synthetic Rubber Co., Ltd.) as a medium material. The rubber composition was mixed with the material and 5% by weight of dicumyl peroxide was added as a vulcanizing agent to obtain a rubber composition, which was vulcanized and molded to prepare a rubber roller. The EPR used here is Mooney viscosity (M
L _{1 + 4} , 100 ° C.) is 70 and the ethylene content is 73% by weight.

[Comparative Example 1] Paraffin oil ("PW-32" manufactured by Idemitsu Kosan) was added to 100 parts by weight of EPDM ("EP33" manufactured by Japan Synthetic Rubber Co., Ltd., solubility parameter = 8.0).
A low molecular weight holding medium material composite prepared by using 51 parts by weight as a low molecular weight material and 9 parts by weight of a crystalline ethylene-ethylene / butylene-crystalline ethylene copolymer polymer (“Dyalon E6100P” manufactured by Japan Synthetic Rubber Co., Ltd.) as a medium material. Things (60 in total)
(Part by weight) was mixed with other general fillers, and 0.3% by weight of sulfur was added as a vulcanizing agent to obtain a rubber composition, which was vulcanized and molded to form a rubber roller. The EPDM used here had a Mooney viscosity (ML _{1 + 4} , 100 ° C.) of 4
5. The ethylene content is 56% by weight.

Comparative Example 2 A low molecular weight material (softening agent) was not added to 100 parts by weight of EPDM (“EP57C” manufactured by Japan Synthetic Rubber Co., Ltd.), but mixed with other general fillers to obtain a vulcanizing agent. The rubber composition obtained by adding 0.3% by weight of sulfur was vulcanized and molded to prepare a rubber roller.

[Comparative Example 3] 51 parts by weight of paraffin oil ("PW-32" manufactured by Idemitsu Kosan Co., Ltd.) as a low molecular weight material (softening agent) in 100 parts by weight of EPDM ("EP57C" manufactured by Japan Synthetic Rubber Co., Ltd.) Was mixed with a conventional filler, and a rubber composition obtained by adding 0.3% by weight of sulfur as a vulcanizing agent was vulcanized and molded to prepare a rubber roller.

Comparative Example 4 100 parts by weight of EPDM (“EP57C” manufactured by Japan Synthetic Rubber Co., Ltd.) and 85 parts by weight of paraffin oil (“PW-32” manufactured by Idemitsu Kosan Co., Ltd.) as a low molecular weight material (softening agent) were used. Was mixed with a conventional filler, and a rubber composition obtained by adding 0.3% by weight of sulfur as a vulcanizing agent was vulcanized and molded to prepare a rubber roller.

Comparative Example 5 100 parts by weight of EPDM (“EP57C” manufactured by Japan Synthetic Rubber Co., Ltd.) and 136 parts by weight of paraffin oil (“PW-32” manufactured by Idemitsu Kosan) as a low molecular weight material (softening agent) were used. Mixed with a typical filler,
An attempt was made to vulcanize and mold a rubber composition obtained by adding 0.3% by weight of sulfur as a vulcanizing agent to prepare a rubber roller.
The workability was very poor and the oil could not be mixed to obtain the desired rubber composition.

[Comparative Example 6] 51 parts by weight of paraffin oil ("PW-32" manufactured by Idemitsu Kosan Co., Ltd.) as a low molecular weight material (softening agent) to 100 parts by weight of EPR ("EP07P" manufactured by Japan Synthetic Rubber Co., Ltd.) A rubber roller was prepared by vulcanizing and molding a rubber composition obtained by adding 5% by weight of dicumyl peroxide as a vulcanizing agent by mixing with a conventional filler.

The following characteristic test was conducted on the sheet feeding member (sheet feeding roller) obtained in the above example. (1) Hardness: 25 × prepared under the same conditions as each paper feed roller
JIS-K6 for 25 × 15mm block sample
The hardness was measured by 301 hardness test (A type). (2) Contamination: Each paper feed roller was pressed against plain paper for a copying machine with a load of 1 kgf and exposed to an atmosphere of −5 ° C. for 24 hours.
After left for a while, the contamination of the plain paper surface and the appearance contamination of each paper feed roller were visually confirmed. (3) Frictional force retention: Each paper feed roller shown in FIG. 1 was mounted on the frictional force measuring device shown in FIG. 2, and one end was pressed against plain paper fixed to the load cell with a load of 300 gf. In this state, the force of pulling the paper, that is, the generated frictional force was measured with a load cell while rotating at a peripheral velocity of 300 mm / sec. Each paper feed roller is mounted on the paper feed device of the copying machine shown in FIG. 3, and 100,00 plain paper (A4 horizontal feed)
After passing 0 sheets, the sheet was mounted on the frictional force measuring device again and the frictional force after passing the sheet was measured, and the frictional force after passing the sheet / initial frictional force was evaluated as the frictional force retention. (4) Abrasion resistance: The amount of abrasion was defined as the change in outer diameter of each paper feed roller after 100,000 sheets of plain paper (A4 transverse feed) were mounted on the paper feeder of the copying machine shown in FIG. .

The evaluation of the workability and workability shown in Table 1 was carried out by measuring the situation when the rubber composition for roller production was mixed (50 ° C., 50 rpm) using a Brabender.
The workability was evaluated as excellent (○) and inferior (x). In addition, the stain resistance was evaluated as one in which there is no external stain on the sample after the above-mentioned test and no stain on the mating material such as paper (◯), and one (x).

The rubber compositions and evaluation results of the above Examples and Comparative Examples are shown below.

[Table 1]

[0061]

As described above in detail, according to the paper feed roller provided with the rubber composition of the present invention as a paper feed member,
(EN) Provided is a paper feed roller which is excellent in stable paper feeding property and has less contamination of a partner material such as paper sandwiched between rollers.
Further, the sheet feeding member such as the sheet feeding roller of the present invention can be used in an apparatus having a sheet feeding mechanism such as an OA device such as a copying machine or a printer.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of a sheet feeding roller according to the present invention.

FIG. 2 is a schematic diagram illustrating measurement of frictional force of a paper feed roller according to the present invention.

[FIG. 3] Examples 1 to 6 and Comparative Examples 1 to 6 in the present invention
FIG. 3 is a cross-sectional view of a main part showing a paper passing state in FIG.

FIG. 4 is a cross-sectional view of a main part of a sheet feeding device equipped with a sheet feeding roller and a friction separating member according to the present invention.

[Explanation of symbols]

 1 Paper Feed Roller 2 Shaft 3 Rubber Composition 4 Bolt 5 Plain Paper 6 Chuck 7 Teflon Plate 8 Paper Feed Roll 1 (Pickup Roller) 9 Paper Feed Roll 2 (Feed Roller) 10 Paper Feed Roll 3 (Reverse Roller) 11 Paper 12 Friction separating member 13 Load cell

Claims (7)

[Claims] 1. A low molecular weight holding medium material composite (A) in various paper feeding members mounted on a device having a paper feeding mechanism, wherein at least a part of the paper feeding member includes a low molecular weight material and a medium material.
And a ethylene-propylene copolymer rubber (B). The low molecular weight material has a viscosity of 5 × 10 ⁵ centipoise or less at 100 ° C., and the low molecular weight material and the medium material. The solubility parameter-value difference of each is 3.0 or less, the weight ratio of the low molecular weight material and the medium material is 1.0 or more, and the low molecular weight material and the ethylene propylene copolymer rubber (B) And the Mooney viscosity of the ethylene-propylene copolymer rubber is 70 or more according to JIS 6300 standard. 2. The paper feeding member according to claim 1, wherein the ethylene-propylene copolymer rubber (B) has an ethylene content of 50 to 75% by weight. 3. The rubber composition contains 0.2 to 1.0 of sulfur.
The sheet feeding member according to claim 1 or 2, wherein the sheet feeding member is contained by weight%. 4. The low-molecular-weight holding medium material composite (A) is added in an amount of 10 to 200 parts by weight based on 100 parts by weight of the ethylene-propylene copolymer rubber (B). The sheet feeding member according to any one of 1. 5. The sheet feeding member according to claim 1, wherein the low molecular weight material is paraffinic or naphthenic. 6. A feed roller rotating in a paper feeding direction,
In a sheet feeding device having a reverse roller which is provided by sandwiching a path of sheets and which rotates in a counter sheet feeding direction, and a pickup roller which feeds out the uppermost sheet of the stacked sheets,
A sheet feeding device, wherein at least one roller of each sheet feeding roller mounted on the sheet feeding device comprises the sheet feeding member according to any one of claims 1 to 5. 7. A sheet feeding device having a sheet feeding roller for feeding a sheet and a friction separating member provided in proximity to the sheet feeding roller, wherein the sheet feeding roller or the friction separating member mounted in the sheet feeding device. A sheet feeding device, wherein the member is the sheet feeding member according to any one of claims 1 to 5.