JP2010128060A - Conductive roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive roller which can prevent whitening of a shaft, by easily discharging the air inside the base body of the conductive roller. <P>SOLUTION: In the conductive roller 10, in which a shaft member 3 provided with a flange section 1 and a shaft section 2 extended in the direction of the roller shaft, is attached to the end section of the cylindrical base body 4 and which has an elastic layer 5, on the outer periphery of the cylindrical base body 4 and the flange section 1, the flange section 1 has a peripheral groove 1a, in the periphery direction of a joint surface to the end section 4a of the cylindrical base body 4 and also on the outer peripheral side of a cylindrical section 1h of the flange section 1, and further, has a hole 1b which penetrates the flange section 1 and is connected to the peripheral groove 1a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a conductive roller (hereinafter also simply referred to as “roller”), and more particularly to a conductive roller that can easily release air in a base body of the conductive roller and prevent shaft whitening.

  In general, in an image forming apparatus using an electrophotographic system such as a copying machine, a printer, and a facsimile machine, a transfer roller, a developing roller, a toner supply roller, a charging roller, a cleaning roller, an intermediate transfer roller, and a belt are used in each image forming process. A roller having conductivity, such as a driving roller, is used.

  As such a conductive roller, for example, in Patent Document 1, a plurality of metal plates are bent, curved into a cylindrical shape, and both side edges thereof are grooved, and a gap between both side edges of each metal plate is formed by groove welding. A cylindrical conductive roller with a welded surface is disclosed.

  In Patent Documents 2 and 3, a conductive elastic layer is formed on the outer periphery of the shaft member, a conductive resin layer is formed on the elastic layer, and the shaft member is a solid cylinder made of resin. And the electroconductive roller which consists of each axial part formed in the both ends is disclosed.

  Furthermore, as shown in FIG. 6, it has the structure which provided the elastic layer 35 in the outer periphery of the cylindrical base | substrate 34, and fitted the flange 31 which formed the axial part 32 on the both ends of the metal pipe according to a use. In addition, a conductive roller 30 having a structure in which an elastic layer 35 is formed on the outer periphery thereof, or a structure in which a cylindrical base body is provided on the outer periphery of a shaft such as a core metal and the elastic layer 35 is formed on the outer periphery thereof is known. It has been.

On the other hand, Patent Document 4 discloses that an adhesive injection hole is provided in the flange in order to prevent the influence of the adhesive on the substrate.
No. 7-54198 JP 2006-251004 A JP 2006-285209 A JP 2001-242747 A

  In the case of using a UV curable resin or the like as the elastic layer 35 in the conventional conductive rollers described in Patent Documents 1 to 3 and the like, the resin is cured by UV irradiation to form the elastic layer 35. Due to the reaction heat, the air in the cylindrical base 34 is thermally expanded to generate bubbles 38 (see FIG. 7). Therefore, in order to discharge the generated bubbles 38, it is essential to provide a hole 31b so as to be connected to the inside surface 31f that is not in contact with the cylindrical base body 34 of the flange portion 31, as shown in FIG.

  However, in the case of the above configuration, the cyanoacrylate-based adhesive 36 used for bonding the cylindrical base body 34 and the flange portion 31 is vaporized and gas 39 is generated, so that the path indicated by the arrow in FIG. As a result, the gas 39 is released from the holes 31b, and as a result, as shown in FIG. In addition, when the adhesive injection hole 31g is provided as described in Patent Document 4 (FIG. 10A), the adhesion between the cylindrical base 34 and the flange portion 31 is improved, but is generated by thermal expansion. There is a problem in that the bubbles cannot be sufficiently discharged because the discharged bubbles are discharged through a path indicated by an arrow in FIG.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a conductive roller that can solve the above problems and can easily release air in the base of the conductive roller and prevent the shaft from being whitened.

  As a result of intensive investigations to solve the above-mentioned problems, the inventor collects air in the cylindrical substrate by providing a circumferential groove in the circumferential direction of the joint surface between the flange portion and the end of the cylindrical substrate. Further, it has been found that by connecting the circumferential groove and the hole, such air can be easily released, and whitening of the shaft can be prevented, and the present invention has been completed.

That is, in the conductive roller of the present invention, a shaft member having a flange portion and a shaft portion extending in the roller axial direction is attached to the end portion of the cylindrical base body,
In the conductive roller having an elastic layer on the outer periphery of the cylindrical base and the flange portion,
The flange portion has a circumferential groove on the outer peripheral side of the cylindrical portion of the flange portion in the circumferential direction of the joint surface with the end portion of the cylindrical base body,
Furthermore, it has a hole penetrating the flange portion and connected to the circumferential groove.

  In the conductive roller of the present invention, it is preferable that the flange portion has a circumferential groove in a circumferential direction of a joint surface with an inner surface of the end portion of the cylindrical base body.

  Furthermore, in the conductive roller of the present invention, the flange portion has a plurality of adhesive grooves on the joint surface with the inner surface of the end portion of the cylindrical substrate, and the hole is provided in the middle of the plurality of adhesive grooves. It is preferable.

  Furthermore, the conductive roller of the present invention preferably has a plurality of holes, and the diameter of the holes is preferably 0.1 to 1.0 mm.

  Furthermore, the conductive roller of the present invention preferably has a radius of curvature R (mm) of the circumferential groove of 0.05 to 0.30.

  ADVANTAGE OF THE INVENTION According to this invention, it became possible to provide the electroconductive roller which can discharge | emit easily the air in the base | substrate of an electroconductive roller, and can prevent whitening of a shaft.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing an example of a conductive roller according to a preferred embodiment of the present invention. The conductive roller 10 according to the present invention has a shaft member 3 having a flange portion 1 and a shaft portion 2 extending in the roller axial direction attached to an end portion thereof, and is elastic on the outer periphery of the cylindrical base 4 and the flange portion 1. The layer 5 is provided.

  FIG. 2 is a cross-sectional view illustrating an example of an end portion of a conductive roller according to a preferred embodiment of the present invention, and FIG. 3 is a perspective view illustrating an example of a shaft member. As shown in FIGS. 2 and 3, the conductive roller 10 of the present invention has a flange portion 1 in the circumferential direction of the joint surface 1 c with the end portion 4 a of the cylindrical base 4 and a cylindrical shape of the flange portion 1. A circumferential groove 1a is provided on the outer peripheral side of the portion 1h. Moreover, as shown in FIG. 2, it has the hole 1b which penetrates the flange part 1, and also has the structure where the circumferential groove 1a and the hole 1b were connected. Thereby, bubbles generated by thermal expansion of air in the cylindrical base body 4 can be easily discharged to the outside via the circumferential groove 1a or directly from the hole 1b. Further, by adopting such a structure, the gas generated by the evaporation of the adhesive is not released from the inside of the cylindrical base body 4, and the whitening of the shaft portion 2 can be prevented.

  FIG. 4 is a cross-sectional view showing another example of the end portion of the conductive roller according to the preferred embodiment of the present invention. According to another conductive roller 10 of the present invention, the flange portion 1 is in the circumferential direction of the joint surface 1f with the inner side surface 4b of the end portion of the cylindrical base 4, and the outer peripheral side of the cylindrical portion 1h of the flange portion 1 It is preferable to have a peripheral groove 1d and a hole 1e penetrating the flange portion 1. Furthermore, the circumferential groove 1d and the hole 1e are connected. Thereby, bubbles generated by thermal expansion of air in the cylindrical base 4 can be easily discharged to the outside via the circumferential groove 1d or directly from the hole 1e. Further, no gas is generated from the inside of the cylindrical substrate 4 due to the vaporization of the adhesive, and whitening of the shaft portion 2 can be prevented.

  FIG. 5 is a front view showing an example of the flange portion. In the present invention, the flange portion 1 has a plurality of adhesive grooves 1g on the joint surface 1f with the inner side surface 4b of the end portion of the cylindrical substrate 4, and the holes 1b and 1e are provided in the middle of the plurality of adhesive grooves 1g. It is preferable. Thereby, an adhesive agent can be hold | maintained to the adhesive groove 1g, and adhesiveness can be made more favorable. Further, the number of the adhesive grooves 1g is not limited as long as it is plural, but is preferably three or more, and more preferably three.

  The conductive roller of the present invention preferably has a plurality of holes 1b and 1e. By using a plurality of holes 1b and 1e, it is possible to more easily discharge bubbles generated by the thermal expansion of air in the cylindrical substrate 4, and it is also possible to prevent the generation of bubbles.

  In the conductive roller of the present invention, the diameter of the holes 1b and 1e is preferably 0.1 to 1.0 mm. By setting the diameters of the holes 1b and 1e within such a range, bubbles generated by thermal expansion of air in the cylindrical substrate 4 can be more easily discharged, and generation of bubbles can be prevented.

  Furthermore, in the conductive roller of the present invention, it is preferable that the radius of curvature R (mm) of the circumferential grooves 1a and 1d is 0.05 to 0.30. By setting the radius of curvature R in such a range, bubbles generated by thermal expansion of air in the cylindrical base 4 can be more easily discharged via the circumferential grooves 1a and 1d.

  In the present invention, a hollow metal pipe can be used as the main body of the cylindrical substrate 4. The material of the metal pipe is not particularly limited as long as it is made of a metal material having good conductivity. For example, iron, stainless steel, aluminum or an alloy containing these may be used. it can. As long as the thickness of the metal pipe is sufficient in strength, it is preferably thinner in terms of weight reduction, for example, 0.3 to 2 mm.

  In the present invention, the material of the flange portion 1 and the shaft portion 2 may be any material, such as various metal materials or resin materials, depending on the use of the roller. From the viewpoint of ease and the like, it is preferable to be made of a resin material.

  Specifically, as the resin material of the flange portion 1 and the shaft portion 2, in the case of engineering plastics, for example, polyacetal, polyamide resin (for example, polyamide 6, polyamide 6 · 6, polyamide 12, polyamide 4 · 6, polyamide 6) 10, polyamide 6,12, polyamide 11, polyamide MXD6 (polyamide obtained from metaxylenediamine and adipic acid), polyoxymethylene, polybutylene terephthalate, polyphenylene oxide, polyphenylene ether, polyphenylene sulfide, polyether sulfone, Polycarbonate, polyimide, polyamideimide, polyetherimide, polysulfone, polyetheretherketone, polyethylene terephthalate, polyarylate, liquid crystal polymer, poly , And the like tetrafluoroethylene. Examples of the general-purpose resin include polypropylene, acrylonitrile-butadiene-styrene (ABS) resin, polystyrene, and polyethylene. In addition, a melamine resin, a phenol resin, a silicone resin, etc. can also be used. These may be used individually by 1 type and may be used in combination of 2 or more type.

  Among the above, engineering plastics are preferable, and in particular, polyacetal, polyamide resin, polybutylene terephthalate, polyphenylene ether, polyphenylene sulfide, polycarbonate, and the like are further improved in terms of thermoplasticity, excellent moldability, and excellent mechanical strength. preferable. In particular, polyamide 6 · 6, polyamide MXD6, polyamide 6 · 12, polybutylene terephthalate, or a mixed resin thereof is preferable. Although there is no problem in using a thermosetting resin, it is preferable to use a thermoplastic resin in consideration of recyclability.

  As the conductive agent in the case where the flange portion 1 and the shaft portion 2 are provided with conductivity, various materials can be used as long as they can be uniformly dispersed in the resin material. Powdered conductive agents such as powder, graphite powder, metal powder such as carbon fiber, aluminum, copper and nickel, metal oxide powder such as tin oxide, titanium oxide and zinc oxide, and conductive glass powder are preferably used. These may be used individually by 1 type and may be used in combination of 2 or more type. The blending amount of the conductive agent may be selected so that an appropriate resistance value can be obtained according to the intended use and situation of the conductive roller, and is not particularly limited. It is preferable to set it as 5-40 mass%, especially 5-20 mass%.

  Furthermore, in the resin material of the flange portion 1 and the shaft portion 2, various conductive or non-conductive fibrous materials, whiskers, ferrites, and the like can be blended as needed for the purpose of reinforcement or increase in weight. Examples of the fibrous material include fibers such as carbon fiber and glass fiber, and examples of the whisker include inorganic whiskers such as potassium titanate. These may be used individually by 1 type, and may be used in combination of 2 or more types. These blending amounts can be appropriately selected according to the length and diameter of the fibrous material or whisker to be used, the type of the main resin material, the intended roller strength, etc. 70% by mass, in particular 10 to 20% by mass.

  The material of the elastic layer 5 formed on the outer peripheral surface of the cylindrical substrate 4 is not particularly limited, and for example, an ultraviolet curable resin or an electron beam curable resin can be suitably used. Specific examples of such ultraviolet curable resins or electron beam curable resins include polyester resins, polyether resins, fluorine resins, epoxy resins, amino resins, polyamide resins, acrylic resins, acrylic urethane resins, urethane resins, and alkyds. Resins, phenol resins, melamine resins, urea resins, silicone resins, polyvinyl butyral resins, and the like can be used, and one or more of these can be used in combination. Moreover, you may use the modified resin which introduce | transduced specific functional group into these resin.

  Among the above, a (meth) acrylate-based resin composition containing a (meth) acrylate oligomer is particularly preferable. Examples of such (meth) acrylate oligomers include urethane (meth) acrylate oligomers, epoxy (meth) acrylate oligomers, ether (meth) acrylate oligomers, ester (meth) acrylate oligomers, and polycarbonate (meth). Examples include acrylate oligomers, and fluorine-based and silicone-based acrylic oligomers.

Hereinafter, the present invention will be described in more detail with reference to examples.
(Example)
As shown in FIG. 1 and FIG. 2, a flange portion 1 (material: POM (polyester) having shaft portions 2 at both ends of a metal pipe (material: aluminum A6063, length: 230 mm, thickness 0.7 mm, outer diameter φ18 mm). By applying a coating material for forming an elastic layer to the outer peripheral surface of the cylindrical substrate 4 to which a plastics (EB-10), thickness 1.2 mm) is fitted, a film thickness of 7 mm is obtained. Then, the elastic body 5 was formed, and the conductive roller 10 was obtained.

  The flange portion 1 was provided with one hole 1b having a hole diameter of 0.5 mm, and a circumferential groove 1a having a curvature radius R of 0.15 mm on the outer periphery. Further, the cylindrical substrate 4 had an outer diameter of 18 mm, an inner diameter of 16.8 mm, and three adhesive grooves 1g.

As the coating material for forming an elastic layer, urethane (meth) acrylate oligomer UV3000B (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., functional group number: 2, molecular weight: 18000) 65 parts by mass, (meth) acrylate monomer LA (lauryl acrylate, Kyoeisha Chemical Co., Ltd., functional group number: 1, Tg: −3 ° C. 25 parts by mass and A-SA (β-acryloyloxyethyl hydrogen succinate, Shin-Nakamura Chemical Co., Ltd., functional group number: 1, Tg : -10 ° C.) A mixture comprising 10 parts by mass, 0.5 parts by mass of photopolymerization initiator IRGACURE 184 (Ciba Specialty Chemicals Co., Ltd.), and conductive agent MP-100 (Akishima Chemical Industry Co., Ltd.) A UV curable resin raw material obtained by stirring and mixing with a stirrer at a liquid temperature of 70 ° C. for 1 hour at 60 rpm was used. The coating material for forming the elastic layer is cured to the extent that the shape can be maintained by applying spot UV irradiation while being applied, and then UV is applied for 5 seconds at a UV irradiation intensity of 700 mW / cm ² while rotating in a nitrogen atmosphere. The elastic layer 5 was formed by curing by irradiation.

  The conductive roller 10 of the example could easily discharge bubbles generated by the thermal expansion of air in the cylindrical base body 4, and could prevent the shaft from being whitened.

It is a figure which shows an example of the electroconductive roller which concerns on suitable embodiment of this invention. It is sectional drawing which shows an example of the edge part of the electroconductive roller which concerns on suitable embodiment of this invention. It is a perspective view which shows an example of a shaft member. It is sectional drawing which shows another example of the edge part of the electroconductive roller which concerns on suitable embodiment of this invention. It is a front view which shows an example of a flange part. It is a figure which shows the conventional electroconductive roller. It is sectional drawing which shows the conventional shaft member. It is sectional drawing which shows the conventional shaft member. It is a perspective view which shows the conventional shaft member. It is sectional drawing which shows the conventional shaft member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 31 Flange part 1a, 1d Circumferential groove 1b, 1e Hole 1c Joining surface 1f with the edge part of a cylindrical base | substrate 1g, 31g Bonding groove | channel 1h with the inner surface of the edge part of a cylindrical base | substrate Base part 31b Hole 31f Flange Inner side surface 2, 32 which is not in contact with the cylindrical base of the shaft part 3, 33 Shaft member 4, 34 Cylindrical base member 4 a End part 4 b of the cylindrical base member inner side face 5, 35 of the end part of the cylindrical base member Elastic layer 6, 36 Adhesive 10, 30 Conductive roller 38 Bubble 39 Gas 40 Whitening

Claims (6)

A shaft member having a flange portion and a shaft portion extending in the roller axial direction is attached to an end portion of the cylindrical base body,
In the conductive roller having an elastic layer on the outer periphery of the cylindrical base and the flange portion,
The flange portion has a circumferential groove on the outer peripheral side of the cylindrical portion of the flange portion in the circumferential direction of the joint surface with the end portion of the cylindrical base body,
The conductive roller further includes a hole penetrating the flange portion and connected to the circumferential groove.   The conductive roller according to claim 1, wherein the flange portion has a circumferential groove in a circumferential direction of a joint surface with an inner surface of the end portion of the cylindrical base body. The flange portion has a plurality of adhesive grooves on the joint surface with the inner surface of the end portion of the cylindrical base body,
The conductive roller according to claim 1, wherein the hole is provided in the middle of the plurality of adhesive grooves.   The electroconductive roller as described in any one of Claims 1-3 which has multiple said holes.   The conductive roller according to claim 1, wherein the hole has a diameter of 0.1 to 1.0 mm.   The conductive roller according to claim 1, wherein a curvature radius R (mm) of the circumferential groove is 0.05 to 0.30.

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