JP2005292294A - Method of joining engagement member and electrophotographic photoreceptor using the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color image forming device which is capable of forming images free from unevenness of density and color slippage by reducing out-of roundness of an end part outer diameter, total deflection, and cylindricity of a photosensitive drum. <P>SOLUTION: A joining method is characterized in that when an engagement member is engaged with the end part of a cut cylinder material by an internal chuck system, an outer diameter of a part to be engaged of the engagement member is made larger than an outer diameter of an internal chuck, and the out-of-roundness of the outside diameter of the part to be engaged of the engagement member is made higher than that of the inside diameter of the end part of the cylinder material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an engagement member coupling method and an electrophotographic photosensitive member using the coupling method in a color image forming apparatus such as a color copying machine, a color printer, and a color facsimile.

  Conventionally, a configuration in a full-color image forming apparatus using an electrophotographic method includes a rotating developer including four color developing devices of black (Bk), yellow (Y), magenta (M), and cyan (C), and an image. A photosensitive member as a carrier and a transfer member are provided. The photosensitive member is charged and exposed with a light beam to form an electrostatic latent image on the photosensitive member. The toner is developed and visualized as a toner image. Each time an image is obtained, the process of transferring the toner image onto the recording medium on the transfer body is repeated for all the four color toner images on the common photoconductor, and these four color images are formed on the recording medium. A method for obtaining a full color image in which toner images are superimposed (multiple transfer method) (see, for example, Patent Documents 1 and 2), or a plurality of electrostatic latent image forming chargers, exposure means, and developing devices around a photoreceptor. With one pass of the photoreceptor Obtaining a number color image, one-pass color image system is known (multiple development method) (for example, see Patent Documents 3 and 4).

  In the latter method, since it is necessary to provide a plurality of chargers, exposure means, and developing units, the apparatus is increased in size, and toner is easily scattered to overlap toner images on the photosensitive member. In many cases, the former multiple transfer method is adopted because there are many problems such as insufficient image reproducibility if the transfer efficiency is low when performing batch transfer.

  Recently, in order to support various recording media, color images are formed using an intermediate transfer method in which a toner image is transferred once onto an insulating or intermediate resistance intermediate transfer member and then transferred onto a transfer material at a time. There is a device.

  In addition, as a color image forming apparatus capable of increasing the number of copies per unit time without increasing the size of the apparatus in response to a demand for speeding up image formation, rotational development containing a plurality of color developing devices is provided. A color image forming apparatus, and a movable or fixed developing device disposed on the upstream side in the rotation direction of the photoconductor with respect to the rotary developing device, in contact with the photoconductor with a tracking roll or at a small interval There is a device.

  On the other hand, in order to produce an electrophotographic photosensitive drum, a hot extruded tube of aluminum or aluminum alloy cut by a lathe is used.

  This hot extruded tube has a large surface roughness and outer diameter roundness before processing, and cannot be used as an electrophotographic photoreceptor as it is, and requires surface cutting.

  However, even if the extruded tube is cut, the surface roughness and the roundness of the central portion of the tube are good, but the ends of the tube may be deformed due to chucking both ends of the tube during cutting. is there.

  When the outer diameter is cut in that state, the roundness is good when chucking is performed, but when chucking is removed, a phenomenon of springback that returns to the roundness before cutting occurs. Even when an electrophotographic photosensitive member is manufactured in this state, the roundness of the end portion is extremely bad, and therefore, when mounted on a color printer, the precise distance from the developer roller is not constant, and uneven development and uneven charging occur. As a result, unevenness or color misregistration occurs in the image.

Various methods are conceivable for improving the roundness of the end outer diameter. Looking only at the development process, a tracking roll is provided on the same axis as the developing roll as a mechanism for finely adjusting the total shake of each photosensitive drum, and the tracking roll is pressed against the photosensitive drum to develop the photosensitive drum and the developing drum. A tracking method that keeps the distance from the roll constant to some extent is generally known. However, when the tracking method is employed, a phenomenon called banding occurs, and as a result, it is difficult to obtain a good color image. In addition to the development process, it may be possible to adjust the distance between each photosensitive drum and the laser optical unit, the distance from the transfer belt, the distance from the charger, etc., but it is very difficult to adjust these distances. It is. Therefore, basically, the outer diameter roundness, deflection, and cylindricity of the photosensitive drum must be small.
JP 05-046032 A Japanese Patent Application Laid-Open No. 06-337597 JP 2000-275981 A JP 2000-347476 A

  The present invention has been made for the purpose of solving the above-mentioned drawbacks in the prior art. Accordingly, an object of the present invention is to realize a color image forming apparatus capable of forming an image free from density unevenness and color misregistration by reducing the outer diameter roundness, total runout, and cylindricality of the end of the photosensitive drum. Another object of the present invention is to provide an engagement member coupling method and an electrophotographic photoreceptor using the coupling method.

  The present invention relates to a color image forming apparatus including a plurality of photosensitive drums and a charging device, a laser beam irradiation device, and a developing device for each photosensitive drum. The outer diameter roundness of the photosensitive drum end portion is improved by fitting a flange with good roundness to the end portion of the photosensitive drum. That is, according to the present invention, when the engagement member is fitted to the end of the cylindrical body cut by the inner diameter chuck method, the engagement member has a larger outer diameter than the outer diameter of the inner diameter chuck. The coupling method is characterized in that an outer diameter roundness of a fitting portion of mating engagement members is better than an inner diameter roundness of an end portion of a cylindrical body.

  The above-described configuration is newly shown in the following (1) to (5).

  (1) When engaging the engaging member with the end of the cylindrical body cut by the inner diameter chuck method, the engaging member has an outer diameter larger than the outer diameter of the inner diameter chuck, and the engaging member A joining method in which the outer diameter roundness of the fitting portion of the joint member is better than the inner diameter roundness of the end of the cylindrical body.

  (2) The coupling method according to (1), wherein the minimum inner diameter of the cylindrical body before fitting is smaller than the outer diameter of the engaging member to be fitted, and the outer diameter difference is 2 μm to 30 μm.

  (3) The coupling method according to (1) or (2), wherein the engaging member to be fitted is a flange with a drive gear or a flange with a shaft.

  (4) In the above (1) to (3), the cylindrical body is expanded in diameter by a high frequency induction heating device when the engaging member is fitted, and after the flange is fitted, it is cooled and is a coupling method by interference fitting. Join method.

  (5) An electrophotographic photoreceptor using the bonding method described in (1) to (4) above.

  According to the present invention, the end portion outer diameter roundness of the photosensitive drum is improved by press-fitting or heat-fitting a flange with a small fitting portion outer diameter roundness into both ends of the cut aluminum cylinder, The overall shake and cylindricity of the entire photosensitive drum become small, and a copy image free from density unevenness, pitch unevenness, color misregistration, and the like is obtained.

  In the present invention, the roundness is described in JIS B0621, which means “the magnitude of deviation from a geometrically correct circle of a circular shape, and the cylindricity is the cylindrical shape described in JIS B0621. The total runout refers to an object that should have a cylindrical surface with the datum axis line as described in JIS B0621 as the datum axis line. When rotating around, the surface is displaced in a specified direction (radial direction).

  In the present invention, the total runout of the photosensitive drum depends on the processing of the drum itself and the flange, etc. In order to reduce the total runout to a small value, This is to reduce the cylindricity, that is, to reduce the roundness of the end of the photosensitive drum cylinder. For this purpose, it is preferable to press-fit an end engaging member (flange) that has been machined with a better outer diameter roundness than the outer diameter roundness of the end of the photosensitive drum cylinder. However, it is preferable that the minimum inner diameter of the photosensitive drum cylinder before fitting is smaller than the outer diameter of the engaging member to be fitted, and the difference is 20 μm or less.

  Further, when the engaging member is fitted, the photosensitive drum cylinder is heated by the high frequency induction heating coil to be expanded in diameter, and after cooling, it is possible to adopt a coupling method by an interference fit (so-called press-fit) state.

  Roundness, cylindricity, and total runout are measured by a roundness measuring machine (Round Test RA-600 manufactured by Mitutoyo Corporation). In the present invention, the entire circumference is measured, and in the axial direction, nine points are measured at intervals of 10 mm from the end 10 mm.

  In general, it is well known that the resolution of a color image is expressed in units of dpi or spi (number of dots per inch). If the total vibration of the drum is 1 dot pitch or less of the laser beam for image writing, even if a color shift occurs, the shift is 1 dot or less, so that it is substantially inconspicuous. Also, regarding the toner density difference, if the total runout of the photosensitive drum is 1 dot pitch or less, it becomes almost inconspicuous, so density unevenness will occur even when developing with each color toner and transferring to form a color image. No longer.

  The present invention will be described in detail. A color image forming apparatus to which the present invention is applied is equipped with a photosensitive drum obtained by cutting an aluminum alloy tube. A charger, a laser optical unit, and a developing device are provided around the photosensitive drum, and image exposure is performed by the laser optical unit, and development is performed by the developing device. It is a cleaner for wiping off residual toner, and a transfer charger for adhering the toner onto the belt. In this embodiment, a photosensitive drum applied to a 600 dpi color image forming apparatus will be described in detail. In the present invention, it is necessary to set the total shake to a value not more than the laser writing pitch, that is, not more than the dot pitch of the resolution of the color image to be obtained. Therefore, in the case of the 600 dpi color image forming apparatus, since the dot pitch is 25.4 / 600 = 0.0423 mm, the total shake of the photosensitive drum needs to be 42.3 μm or less.

  Next, a method for producing the photosensitive drum as described above will be described in detail. FIG. 2 shows a photosensitive drum used in the present invention. As shown in the figure, the photosensitive drum has a structure in which a base, a photosensitive layer formed on the base, and flanges are combined on both sides of the base. In order to fabricate the base material, first, an extruded aluminum alloy tube made of A3003 material defined in JIS is prepared. For example, a raw tube having a thickness of about 3.1 mm, an outer diameter of 84.2 mm, and a total length of 340 mm is prepared. First, a part of the outer diameter of the raw tube is grasped by an end face processing machine, end faces are processed at both ends of the aluminum cylinder, and the outer diameter is cut to 84.00 mm. At this time, the thickness of the cutting tube is about 3.0 mm, the surface roughness is 1.5 ± 0.2 μm at the maximum height Rz (JIS B0601: 2001), and the ten-point average roughness Rzjis (JIS B0601: 2001). ) 0.8 ± 0.1 μm, arithmetic average roughness Ra (JIS B0601: 2001) is 0.15 ± 0.05 μm, and average length RSm (JIS B0601: 2001) is 20-40 μm.

  When processed in this way, the finishing accuracy is such that the cylindricity of the outer diameter is around 10 μm, the coaxiality of the inner and outer diameters is around 20 μm, the perpendicularity of the end face is about 30 μm, and the straightness is about 15 μm or less. Further, as shown in Table 1, the roundness of the cutting tube is worse as it is closer to both ends as viewed in the longitudinal direction, and the accuracy of the outer diameter cylindricity is determined by the outer diameter roundness at the end. . Further, when the end portion is used as a reference, the center portion has a large amount of shake, and the shake becomes smaller toward the end portion.

  A photosensitive layer is formed by forming a photosensitive layer on the cut aluminum tube after cutting. The structure of the electrophotographic photoreceptor of the present invention will be described in detail below.

  First, a conductive layer is applied on the substrate as necessary. The conductive layer is composed of at least conductive particles and a resin binder. The conductive particles dispersed in the conductive layer are each made of zinc oxide, titanium oxide, tin oxide, antimony oxide, indium oxide, bismuth oxide, indium oxide doped with tin, tin oxide doped with antimony or tantalum, and the like. Conductive metal oxides such as zirconium oxide, metal sulfides such as barium sulfate, carbon black, etc., or particles containing these, among others, tin oxide that has been subjected to conductive treatment, titanium oxide that has been subjected to conductive treatment, conductive Desirable is barium sulfate treated and antimony oxide treated. Among them, titanium oxide subjected to a conductive treatment and barium sulfate subjected to a conductive treatment are particularly preferable. The average particle diameter is preferably 0.01 to 0.5 μm, more preferably 0.02 to 0.3 μm. The resin in which the conductive particles are dispersed can be appropriately selected from those which are not eluted by the solvent of the barrier layer or the coating material for the photosensitive layer that is directly applied onto the conductive layer. In general, when the average particle size of the filler becomes small, dispersion becomes difficult and reaggregation tends to occur, but the filler of the present invention is excellent in dispersibility. Content of a filler is 1.0-90 mass% with respect to a conductive layer, Preferably it is 5.0-80 mass%.

  As the resin used for the conductive layer, for example, phenol resin, polyurethane, polyamide, polyimide, polyamideimide, polyamic acid, polyvinyl acetal, epoxy resin, acrylic resin, melamine resin, or polyester is preferable. These resins may be used alone or in combination of two or more. These resins have good adhesion to the substrate, improve dispersibility of the filler used in the present invention, and have good solvent resistance after film formation. Polyurethane is preferred.

  In order to improve the dispersibility of the filler, the filler surface may be treated with a treatment agent such as a coupling agent (such as a silane coupling agent or a titanium coupling agent) or silicone oil. Moreover, you may contain the said processing agent in the binder of a conductive layer.

  The thickness of the conductive layer is preferably 0.1 to 30 μm, more preferably 0.5 to 20 μm. The volume resistivity of the conductive layer is preferably 1013 Ωcm or less, more preferably 10 Ωcm or more and 1012 Ωcm or less.

  Examples of the method for applying the conductive layer include dip coating (dipping), blade coating, bar coating, and spray coating.

  A leveling agent may be added to the conductive layer in order to enhance the surface properties of the conductive layer.

  Depending on the type of material of the photosensitive layer, free carriers may be injected from the conductive layer to the photosensitive layer, which lowers the charging ability of the photoreceptor and greatly affects image characteristics. In such a case, free carrier injection is effectively suppressed by providing an intermediate layer (for example, an appropriate resin thin film) having an electrical barrier property between the conductive layer and the photosensitive layer as necessary. be able to.

  In addition, an intermediate layer (undercoat layer) having a barrier function and an undercoat function can be provided between the conductive substrate of the present invention and the photosensitive layer.

  The undercoat layer can be formed to improve the adhesion of the photosensitive layer, protect the substrate, improve the charge injection from the substrate, protect against electrical breakdown of the photoreceptor, and the like. As the material for the undercoat layer, polyvinyl alcohol, poly-N-vinylimidazole, polyethylene oxide, ethyl cellulose, methyl cellulose, ethylene / acrylic acid copolymer, casein, polyamide, copolymer nylon (registered trademark), glue, gelatin, etc. are used. The

  An undercoat layer by a sol-gel method using an inorganic polymer compound may also be used. These include a mixture of zirconium and a silane compound, a silane compound and a compound obtained by adding a cellulose resin to a zirconium compound, and a coating solution obtained by adding a butyral resin to an inorganic component of zirconium and silane.

  The thickness of the undercoat layer is preferably 0.1 to 3 μm, more preferably 0.3 to 2 μm.

  Examples of methods for applying the undercoat layer include dip coating (dipping), blade coating, bar coating, and spray coating.

  The photosensitive layer in the present invention may be either a laminated photoreceptor having a charge generation layer and a charge transport layer, a single-layer photoreceptor, or a photoreceptor provided with a surface protective layer.

  Examples of methods for applying the photosensitive layer to the photoreceptor substrate of the present invention include dip coating (dipping), blade coating, bar coating, and spray coating.

  The charge generation layer is formed from a charge generation material and a resin binder.

  Examples of the resin binder include polystyrene, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, styrene-maleic anhydride copolymer, polyester, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, poly Vinylidene chloride, polyacrylate resin, phenoxy resin, polycarbonate, cellulose acetate resin, ethyl cellulose resin, polyvinyl butyral, polyvinyl formal, polyvinyl toluene, poly-N-vinylcarbazole, acrylic resin, silicon resin, epoxy resin, melamine resin, urethane resin, Thermoplastic or thermosetting resins such as phenol resin and alkyd resin can be mentioned.

  Examples of the charge generation material include CI Pigment Blue 25 [Color Index (CI) 21180], CI Pigment Red 41 (CI 21200), CI Acid Red 52 (CI 45100), CI Basic Red 3 (CI 45210), Phthalocyanine pigment having a porphyrin skeleton, azulenium salt pigment, squaric salt pigment, azo pigment having a carbazole skeleton, azo pigment having a stilstilbene skeleton, azo pigment having a triphenylamine skeleton, an azo pigment having a dibenzothiophene skeleton, oxadi Azo pigment having azole skeleton, azo pigment having fluorenone skeleton, azo pigment having bis stilbene skeleton, azo pigment having distyryl oxadiazole skeleton, distyryl carbazo An azo pigment having a skeleton, a triazo pigment having a carbazole skeleton, and a phthalocyanine pigment such as CI Pigment Blue 16 (CI 74100), an indigo type such as CI Eye Bat Brown 5 (CI 73410), and C Eye Bat Dye (CI 73030) Organic pigments such as pigments, perylene pigments such as Argo Scarlet B (manufactured by Violet) and Indusence Scarlet R (manufactured by Bayer) can be used.

  The thickness of the charge generation layer is suitably about 0.05 to 2 μm, preferably 0.1 to 1 μm.

  The charge generation layer can be formed by dissolving or dispersing the binder and the charge generation material in an appropriate solvent, and applying and drying the solution. As the solvent, benzene, toluene, xylene, methylene chloride, dichloroethane, monochlorobenzene, dichlorobenzene, ethyl acetate, butyl acetate, methyl ethyl ketone, dioxane, tetrahydrofuran, cyclohexanone, methyl cellosolve, ethyl cellosolve, etc. may be used alone or in combination. it can.

  The charge transport layer can be formed by dissolving or dispersing a charge transport material and a resin binder similar to that used in the charge generation layer in an appropriate solvent, applying the solution on the charge generation layer, and drying. Moreover, a plasticizer, a leveling agent, etc. can also be added as needed.

  Examples of charge transport materials include poly-N-vinylcarbazole and derivatives thereof, poly-γ-carbazolylethyl glutamate and derivatives thereof, pyrene-formaldehyde condensates and derivatives thereof, polyvinylpyrene, polyvinylphenanthrene, oxazole derivatives, oxadiazole Derivatives, imidazole derivatives, triphenylamine derivatives, 9- (p-diethylaminostyryl) anthracene, 1,1-bis- (4-dibenzylaminophenyl) propane, styrylanthracene, styrylpyrazoline, phenylhydrazones, α-phenyl Examples thereof include electron donating substances such as stilbene derivatives.

As the solvent at this time, tetrahydrofuran, dioxane, toluene, monochlorobenzene, dichloroethane, methylene chloride, methylal and the like can be used.
The thickness of the charge transport layer is suitably about 5 to 40 μm.

  The flanges to be fitted on both sides of the photosensitive drum are manufactured by injection molding or the like mainly using a synthetic resin (for example, ABS resin, polycarbonate, modified PPO resin, etc.). However, since the flange is a resin molded product, the roundness of the molding accuracy and the accuracy of the outer diameter absolute value are relatively poor, and therefore the fitting portion is cut after injection molding. The length of the fitting portion is usually about 1 to 10 mm, and the outer diameter is cut to be 1 to 20 μm larger than the inner diameter of the cylinder to be fitted. Further, in order to correct even when inserted at an angle when the flange is fitted, and to combine with good accuracy, a flange portion having a diameter of several millimeters larger than the fitting portion is provided as shown in FIG. The buttock hits the end of the cylinder and has a structure to correct the bend. Further, several ribs may be provided to give strength to the shaft portion of the flange and the whole. In addition to the resin, the flange can be made of metal such as aluminum, aluminum alloy, iron, copper, nickel, brass, and stainless steel.

  In the present invention, a flange obtained by cutting the outer diameter of the fitting portion using a lathe is used. The manufactured flange has a fitting portion outer diameter of 78.12 mm and an outer diameter roundness of about 5 μm. Furthermore, it is desirable that the outer diameter of the flange at this time be made approximately 20 μm larger than the inner diameter of the cutting pipe. As described above, the roundness of the cutting tube tends to become worse as it gets closer to both end portions. Therefore, the inner diameter of the cutting tube can be reduced by slightly press-fitting a flange having a larger outer diameter. The roundness can be improved by correcting the outer diameter.

  In addition to press-fitting, as shown in FIG. 2, a high-frequency induction heating coil is placed close to the end of the aluminum cylinder, current is passed through the coil, and the end of the aluminum cylinder is moved from room temperature (about 20 ° C.) in 1 to 2 seconds. Momentarily heated to 120-200 ° C, the diameter of the end of the aluminum cylinder was increased by 20-30 μm, and after the flange was fitted with a gap in between, the coil current was turned off and rapidly cooled to make aluminum It is also possible to use a high-frequency heat fitting method in which the diameter of the cylinder end portion is contracted so that the fitted flange is in an interference fit state. When a high-frequency induction heating device is used, an excessive force is not applied to the aluminum cylinder and the flange, so that it is easier to fit the flange with higher accuracy than fitting the flange by press fitting. FIG. 3 is a schematic view of the high-frequency heat fitting method used in the present invention.

  Hereinafter, the present invention will be described with reference to examples.

  An extruded aluminum alloy tube made of A3003 material specified by JIS was prepared. The raw tube dimensions were a wall thickness of about 3.1 mm, an outer diameter of 84.2 mm, an inner diameter of 78.10 mm, and a total length of 342 mm. The roundness of the outer diameter of the raw tube at this time was 20 μm at the end 5 mm, and 18 μm at the center. First, the end face processing was performed on both ends of the aluminum cylinder by an end face processing machine so that the end face was chamfered and the length was 340 mm. Next, both ends of the base tube are chucked with a lathe, and the aluminum cylinder surface is cut using a diamond tool, and the maximum height Rz (JIS B0601: 2001) is 1.5 ± 0.2 μm, ten points. The average roughness Rzjis (JIS B0601: 2001) is 0.8 ± 0.1 μm, the arithmetic average roughness Ra (JIS B0601: 2001) is 0.15 ± 0.05 μm, and the average length RSm (JIS B0601: 2001) is It processed so that it might become 20-40 micrometers.

  After machining in this way, the outer diameter roundness of this aluminum cylinder was measured. As a result, the outer diameter roundness at the end of 5 mm was 20 μm, the roundness at the center was 1 μm, the straightness was 15 μm, and the end face was straight. Finishing accuracy was 30 μm.

  A conductive layer was applied to the aluminum cylinder. First, 100 parts by weight of transparent conductive titanium oxide fine powder (Kronos ECT-62 manufactured by Titanium Industry Co., Ltd.), 100 parts by weight of white titanium oxide powder (Tytone SR-1T, manufactured by Sakai Chemical), phenol resin (Dainippon) Ink Chemical Industries, Ltd., Pryofen J-325) 100 parts by weight into 100 parts by weight of methyl cellosolve, and the titanium oxide dispersion obtained by rotating and stirring for 100 hours on a roll base together with 1.2φ glass beads A conductive layer was obtained by dip-coating on the substrate to a dry film thickness of 20 μm and heat curing at 150 ° C. for 30 minutes.

  Next, 10 parts by mass of polyamide resin (trade name: Amilan CM8000, manufactured by Toray Industries, Inc.), 30 parts by mass of methoxymethylated 6 nylon resin (trade name: Toresin EF-30T, manufactured by Teikoku Chemical Co., Ltd.), methanol A coating material dissolved in a mixed solvent of 400 parts by mass and 200 parts by mass of n-butanol was dip-coated on the support and dried with hot air at 90 ° C. for 10 minutes to form an intermediate layer having a thickness of 0.68 μm.

  Next, 4 parts by mass of oxytitanium phthalocyanine having strong peaks at 9.0 °, 14.2 °, 23.9 ° and 27.1 ° with a Bragg angle 2θ ± 0.2 ° in X-ray diffraction of CuKα, polyvinyl A solution consisting of 2 parts by weight of butyral resin (trade name: BX-1, manufactured by Sekisui Chemical Co., Ltd.) and 60 parts by weight of cyclohexanone was dispersed in a sand mill using glass beads having a diameter of 1 mm for 4 hours, and then 100 parts by weight of ethyl acetate. A dispersion for the charge generation layer was prepared by adding parts. The dispersion was dip-coated on the intermediate layer and dried by heating at 95 ° C. for 10 minutes to form a charge generation layer. The film thickness of the charge generation layer was 0.3 μm.

  Next, 9 parts by mass of an amine compound having a structure represented by the following formula:

  1 part by mass of an amine compound having a structure represented by the following formula:

  10 parts by mass of bisphenol Z-type polycarbonate resin (trade name: Iupilon Z-200, manufactured by Mitsubishi Gas Chemical Co., Ltd.) was dissolved in a mixed solvent of 70 parts by mass of monochlorobenzene and 30 parts by mass of dichloromethane. This paint was applied by a dipping method and dried at 120 ° C. for 1 hour to form a charge transport layer having a thickness of 25 μm.

  A gear flange having a fitting portion outer diameter of 78.12 mm and a fitting portion outer diameter roundness of 3 μm is fitted into both ends of the electrophotographic photosensitive member thus produced by press fitting, and the end portion of the electrophotographic photosensitive member cylinder is fitted. When the roundness of the outer diameter at the 5 mm position was measured, it was 3 μm, the total runout was 6 μm, and the cylindricity was 10 μm. When this electrophotographic photosensitive member was mounted on a color laser printer manufactured by Canon Inc., an image was output and the image was evaluated, a good color image free from color shift, pitch unevenness, density unevenness and the like was obtained.

  A resin flange having a fitting portion outer diameter of 78.12 mm and a fitting portion outer diameter roundness of 5 μm was press-fitted to the electrophotographic photosensitive member having an outer diameter roundness of 20 μm at the end portion of 5 mm used in Example 1. . After fitting the flange, the outer diameter roundness of the electrophotographic photosensitive member cylinder end portion at 5 mm was measured to be 5 μm, the total runout was 10 μm, and the cylindricity was 15 μm. Further, when the image was evaluated in the same manner as in Example 1, a good color image free from color shift, pitch unevenness, density unevenness and the like was obtained.

  An aluminum alloy flange having a fitting portion outer diameter of 78.12 mm and a fitting portion outer diameter roundness of 8 μm is fitted to the electrophotographic photosensitive member having an outer diameter roundness of 20 μm at the end portion of 5 mm used in Example 1 by high frequency heating. The device was fitted. After fitting the flange, the outer diameter roundness of the electrophotographic photosensitive member cylinder end portion at 5 mm was measured. As a result, it was 8 μm, the total runout was 15 μm, and the cylindricity was 18 μm. Further, when the image was evaluated in the same manner as in Example 1, a good color image free from color shift, pitch unevenness, density unevenness and the like was obtained.

Comparative Example 1

  A resin flange having a fitting portion outer diameter of 78.12 mm and a fitting portion outer diameter roundness of 30 μm was press-fitted to the electrophotographic photosensitive member having an outer diameter roundness of 20 μm at the end portion of 5 mm used in Example 1. . After fitting the flange, the outer diameter roundness of the electrophotographic photosensitive member cylinder end 5 mm position was measured to be 35 μm, the total runout was 50 μm, and the cylindricity was 60 μm. When the image was evaluated in the same manner as in Example 1, the color image was slightly inferior to the color image in Example 1 in terms of color shift, pitch unevenness, density unevenness, and the like.

Comparative Example 2

  A resin flange having a fitting portion outer diameter of 78.12 mm and a fitting portion outer diameter roundness of 20 μm was press-fitted into the electrophotographic photosensitive member having an outer diameter roundness of 20 μm at the end portion of 5 mm used in Example 1. . After fitting the flange, the outer diameter roundness at the end of the electrophotographic photosensitive member cylinder 5 mm position was measured to be 25 μm, the total runout was 45 μm, and the cylindricity was 55 μm. Further, when the image was evaluated in the same manner as in Example 1, the color image was slightly inferior to the color image of Example 2 in terms of color shift, pitch unevenness, density unevenness and the like.

Comparative Example 3

  An aluminum alloy flange having a fitting portion outer diameter of 78.12 mm and a fitting portion outer diameter roundness of 40 μm is high-frequency heat-fitted on the electrophotographic photosensitive member having an outer diameter roundness of 20 μm and an end portion of 5 mm used in Example 1. The device was fitted. After the flange was fitted, the outer diameter roundness of the electrophotographic photosensitive member cylinder end 5 mm position was measured. As a result, it was 44 μm, the total runout was 60 μm, and the cylindricity was 68 μm. When the image was evaluated in the same manner as in Example 1, the color image was slightly inferior to the color image of Example 3 in terms of color shift, pitch unevenness, density unevenness, and the like.

Schematic of aluminum cylinder and flange used in the present invention Schematic of high-frequency heating fit used in the present invention Schematic of the high-frequency heat-fitting method used in the present invention

Explanation of symbols

1 Aluminum cylinder 2 Flange shaft 3 Flange 4 Flange flange 5 Flange fitting 6 High-frequency heating coil

Claims (5)

  When fitting the engagement member to the end of the cylindrical body cut by the inner diameter chuck method, the outer diameter of the engagement member is larger than the outer diameter of the inner diameter chuck, and the engagement member A coupling method characterized in that the outer diameter roundness of the fitting portion is better than the inner diameter roundness of the end of the cylindrical body.   2. The coupling method according to claim 1, wherein a minimum inner diameter of the cylindrical body before fitting is smaller than an outer diameter of the engaging member to be fitted, and a difference in outer diameter is 2 to 30 [mu] m.   The coupling method according to claim 1 or 2, wherein the engaging member to be fitted is a flange with a drive gear or a flange with a shaft.   4. The coupling method according to any one of claims 1 to 3, wherein the cylindrical member is expanded in diameter by a high frequency induction heating device when the engaging member is fitted, and is cooled by an interference fit after the flange is fitted. How to join.   An electrophotographic photosensitive member using the bonding method according to claim 1.