WO2014112244A1 - Magnetic roller - Google Patents

Magnetic roller Download PDF

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Publication number
WO2014112244A1
WO2014112244A1 PCT/JP2013/083035 JP2013083035W WO2014112244A1 WO 2014112244 A1 WO2014112244 A1 WO 2014112244A1 JP 2013083035 W JP2013083035 W JP 2013083035W WO 2014112244 A1 WO2014112244 A1 WO 2014112244A1
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WO
WIPO (PCT)
Prior art keywords
semi
cylindrical resin
resin magnet
cross
magnet
Prior art date
Application number
PCT/JP2013/083035
Other languages
French (fr)
Japanese (ja)
Inventor
節男 小谷
清 井田
和彦 荻野
Original Assignee
ピーエム技研株式会社
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Application filed by ピーエム技研株式会社 filed Critical ピーエム技研株式会社
Publication of WO2014112244A1 publication Critical patent/WO2014112244A1/en

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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/06Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/09Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
    • G03G15/0921Details concerning the magnetic brush roller structure, e.g. magnet configuration
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/06Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/09Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
    • G03G15/0921Details concerning the magnetic brush roller structure, e.g. magnet configuration
    • G03G15/0928Details concerning the magnetic brush roller structure, e.g. magnet configuration relating to the shell, e.g. structure, composition

Definitions

  • the present invention relates to a magnet roller used in a developing device or a cleaning device in an image forming apparatus such as a copying machine, a printer, or a facsimile machine that forms an image using toner.
  • a magnet roller having a plurality of magnetic poles in the circumferential direction is used for a developing device and a cleaning device.
  • the magnet roller used in the developing device is placed in a stationary state in a rotating cylindrical aluminum sleeve when developing the electrostatic latent image formed on the surface of the photosensitive drum with charged toner.
  • the magnet roller serves to visualize the electrostatic latent image by causing the toner carried on the sleeve surface to fly by the magnetic characteristics of the magnet roller and supplying the toner onto the photosensitive drum.
  • a magnet roller is made by heating and melting a resin magnet material obtained by mixing a ferrite or rare earth powder magnet and a resin, and then forming it into a cylindrical shape by injection molding or extrusion molding. At that time, a magnetic field is applied to the melt from the outside by a permanent magnet or an electromagnet, and the powder magnet in the melt is magnetized and oriented in the direction of the magnetic field, so that the outer peripheral surface of the shaped magnet roller is axially aligned. A plurality of magnetic poles parallel to each other and different in the circumferential direction are generated.
  • FIG. 6 shows the magnetic flux density (magnetic force) of the magnetic pole on the circumference in the cross section perpendicular to the axial direction of the magnet roller 50 as the length of the line segment drawn in the normal direction from the circumference. It shows a curve connecting the vertices and is generally called a magnetic pattern of a magnet roller.
  • the magnetic pole of the magnet roller is composed of a plurality of N poles and S poles, and the total number of these is generally an odd number.
  • One of the most important technologies of a magnet roller manufacturer is to quickly and accurately implement various magnetic patterns required by customers on the magnet roller.
  • a magnetic field of a permanent magnet 42 arranged around the cavity 41 is applied as shown in FIG. Design the magnetic field mold by considering the characteristics, shape, dimensions and position. Magnetic field analysis simulation technology is used to simplify the design of the magnetic field mold and subsequent steps such as molding and evaluation of the magnet roller and, if necessary, correction of the mold as much as possible.
  • a magnet roller for example, as shown in FIGS. 8 and 9, a plurality of magnet pieces 52 having a fan-shaped cross section are integrally attached to a shaft 51 using an adhesive or the like.
  • a magnet roller 50 formed on two cylindrical rollers is widely known.
  • the magnet roller 50 is assembled by attaching a plurality of magnet pieces 52 to the shaft 51, the plurality of pieces are attached with an offset from an accurate position during assembly. In some cases, a desired magnetic pattern cannot be obtained. Therefore, there has been a problem that assembly workability is not easy.
  • a hollow magnetic roller formed by integrally combining a pair of semi-cylindrical half members has been disclosed (for example, see Patent Document 1).
  • the applicant of the present application has a cylindrical magnet roller having a shaft portion at both ends formed by combining elongated semi-cylindrical resin magnets divided into two, an annular portion and a shaft portion. It has proposed a magnet roller or the like composed of two semi-cylindrical members that have further improved fitting accuracy by having (see, for example, Patent Documents 2 and 3).
  • Each of these magnet rollers is made up of a very small number of parts, and is assembled mainly by fitting two semi-cylindrical resin magnets. Made using. Therefore, unlike the magnet roller 50 shown in FIGS. 8 and 9 described above, it is excellent in that the assembling work is very easy because it is difficult for a plurality of pieces to be misaligned during assembly. Further, the hollow structure can reduce the number of members, reduce the manufacturing cost, and is excellent in recycling characteristics because no adhesive or the like is used.
  • Japanese Patent No. 2801878 (Claim 1, paragraph [0007])
  • Japanese Patent No. 3061361 (Claim 1, paragraph [0008], paragraph [0009])
  • JP 2006-18189 A (Claims 1 and 4, paragraph [0024])
  • the present inventors have found that the cross-sectional shape and the like can be a new factor for forming a desired magnetic force pattern in a magnet roller having a hollow structure.
  • the present invention has achieved the present invention which can achieve the formation of a more complicated magnetic pattern more simply and at low cost while maintaining the ease of assembly such as the magnet roller disclosed in US Pat.
  • An object of the present invention is to provide a magnet roller that has an extremely small number of parts, is easy to assemble, and can easily form a complex magnetic pattern at low cost.
  • a first aspect of the present invention includes two semi-cylindrical resin magnet members each having an annular portion at one end and a shaft portion at the other end, and one semi-cylindrical resin magnet member. Is inserted into the annular part of the other semi-cylindrical resin magnet member, and a cylindrical roller having a shaft part is formed at each of both end parts.
  • the cross-sectional shape of the one semi-cylindrical resin magnet member and the cross-sectional shape of the other semi-cylindrical resin magnet member are different from each other in the cross-section of the portion excluding both ends of the roller and / or at least at one location of the cross-section.
  • the thickness of the one half cylindrical resin magnet member and the thickness of the other half cylindrical resin magnet member are different from each other.
  • a second aspect of the present invention is an invention based on the first aspect, and further, in the cross section, the inner surface shape of the one semi-cylindrical resin magnet member and the inner surface shape of the other semi-cylindrical resin magnet member are And / or the dimension from the inner surface to the axial center of one semi-cylindrical resin magnet member and the dimension from the inner surface to the axial center of the other semi-cylindrical resin magnet member are different from each other in at least one place of the cross section. It is characterized by.
  • a third aspect of the present invention is an invention based on the first aspect, wherein the outer surface shape of the one semi-cylindrical resin magnet member and the outer surface shape of the other semi-cylindrical resin magnet member in the cross section are the same. And / or the dimension from the outer surface of one semi-cylindrical resin magnet member to the axial center and the dimension from the outer surface to the axial center of the other semi-cylindrical resin magnet member are different from each other in at least one place of the cross section. It is characterized by.
  • the fourth aspect of the present invention is the invention based on the first aspect, and is characterized in that the cross-sectional shape of at least one of the semi-cylindrical resin magnet members is not a semi-cylindrical shape in the cross-section.
  • a fifth aspect of the present invention is an invention based on the first aspect, and further includes an inner or outer fit between the one semi-cylindrical resin magnet member and the other semi-cylindrical resin magnet member in the cross section. It has a step on the mating surface.
  • a sixth aspect of the present invention is the invention based on the first aspect, wherein the thickness of the one semi-cylindrical resin magnet member and / or the thickness of the other member is uniform in the cross section.
  • a seventh aspect of the present invention is the invention based on the first aspect, and further on the outer peripheral surface of the one half-cylinder resin magnet member and / or the other half-cylinder resin magnet member in the cross section, One or more flat portions are formed.
  • An eighth aspect of the present invention is the invention based on the first aspect, and further on the outer peripheral surface of the one half-cylinder resin magnet member and / or the other half-cylinder resin magnet member in the cross section, One or more convex portions or concave portions are formed.
  • a ninth aspect of the present invention is the invention based on the first aspect, and further on the outer peripheral surface of the one half-cylinder resin magnet member and / or the other half-cylinder resin magnet member in the cross section, One or two or more notches are formed.
  • a magnet roller according to a first aspect of the present invention includes two semi-cylindrical resin magnet members each having an annular portion at one end and a shaft portion at the other end, and is provided with one semi-cylindrical shape.
  • the cross-sectional shape of the one semi-cylindrical resin magnet member and the cross-sectional shape of the other semi-cylindrical resin magnet member are different from each other in the cross-section of the portion excluding both ends of the magnet roller and / or at least of the cross-section.
  • the magnet roller of the present invention is an improvement over the conventional magnet roller composed of two members having the same shape and the same size of the semi-cylindrical shape in the cross section, in order to form a desired magnetic force pattern.
  • the above-mentioned cross-sectional shape and thickness are newly added. Thereby, compared with the conventional magnet roller, it can respond to formation of a more complicated magnetic force pattern.
  • the difference in cross-sectional shape and thickness between the two semi-cylindrical resin magnet members can be performed by changing the shape of the mold used in the injection molding, so that it is relatively easy and low. It can cope with the construction of complicated magnetic patterns at low cost.
  • a bonding process using an adhesive is not required, the assembly process and the dismantling work at the time of recycling are simple, and the process is extremely economical and environmentally superior.
  • the inner surface shape of the one semi-cylindrical resin magnet member and the inner surface shape of the other semi-cylindrical resin magnet member are different from each other in the cross section and / or at least of the cross section.
  • the dimension from the inner surface of one semi-cylindrical resin magnet member to the axial center and the dimension from the inner surface of the other semi-cylindrical resin magnet member to the axial center are different from each other.
  • the surface shape of the hollow portion side formed inside the roller is formed to be different between the two members. Are configured to be different between the two members.
  • two hollow portions formed in the roller so as to have different dimensions from the inner surface to the shaft center of the semi-cylindrical resin magnet member in at least one place of the cross section, that is, two straight lines passing through the shaft center and the fitting surface.
  • the two resin magnet members are configured to have different thicknesses. Accordingly, the cross-sectional shape and thickness can be added as a new factor for forming a desired magnetic pattern without changing the shape or the like of the outer peripheral surface of the magnet roller.
  • the two resin magnet members are configured to have different thicknesses, for example, when the thickness is made thinner than that of the conventional magnet roller, the magnetic force can be controlled to be weak, while the magnet used for manufacturing the resin magnet member It also saves material and is excellent in terms of production cost.
  • the outer surface shape of the one semi-cylindrical resin magnet member and the outer surface shape of the other semi-cylindrical resin magnet member are different from each other in the cross section and / or at least in the cross section. In one place, the dimension from the outer surface of one semi-cylindrical resin magnet member to the axis is different from the dimension from the outer surface of the other semi-cylindrical resin magnet member to the axis.
  • the outer surface shape of the semi-cylindrical resin magnet member that is, the shape of the outer peripheral surface of the roller when the two resin magnet members are fitted is different in the portion of the two resin magnet members, It is comprised so that the said cross-sectional shape may differ. Moreover, it is comprised so that the thickness of two resin magnet members may differ by forming so that the dimension from the outer surface of a semi-cylindrical resin magnet member to an axial center may differ. As a result, the shape and thickness of the cross section and the thickness can be added as new factors for forming a desired magnetic force pattern without changing the inner shape or the like of the magnet roller or in combination with them.
  • the distance from the aluminum sleeve can also be added as a new factor for forming a desired magnetic force pattern.
  • the two resin magnet members in configuring the two resin magnet members to have different thicknesses, for example, when making the thickness thinner than that of the conventional magnet roller, it also saves the magnet material used in the production of the resin magnet member, Excellent production cost.
  • the magnet roller according to the fourth aspect of the present invention at least one of the semi-cylindrical resin magnet members has a non-cylindrical shape in the cross section.
  • the magnet roller of the 5th viewpoint of this invention has a level
  • the magnet roller according to the sixth aspect of the present invention is configured so that the thickness of the one semi-cylindrical resin magnet member and / or the thickness of the other member is uniform in the cross section, after injection molding. Since the resin magnet member is less likely to warp, the fitting operation of the resin magnet member is easy, and the dimensional accuracy of the fitting body is easily obtained.
  • one or more flat portions are formed in the cross-sectional shape on the outer peripheral surface of the one semi-cylindrical resin magnet member and / or the other semi-cylindrical resin magnet member. Is done.
  • one or more convex portions in the cross-sectional shape are formed on the outer peripheral surface of the one semi-cylindrical resin magnet member and / or the other semi-cylindrical resin magnet member. Or a recessed part is formed.
  • one or more notches in the cross-sectional shape are formed on the outer peripheral surface of the one semi-cylindrical resin magnet member and / or the other semi-cylindrical resin magnet member. Is formed. Since the flat part, concave part, notch or convex part provided on the outer peripheral surface side directly affects the distance between the outer peripheral surface of the resin magnet member and the aluminum sleeve, it is effective for adjusting the strength of the magnetic pole, It can cope with the formation of more complicated magnetic pole patterns. Moreover, the said recessed part and notch can also be utilized when inserting the magnetic member from which a magnetic characteristic differs as a magnetic force adjustment material.
  • FIG. 4 is a sectional view taken along line AA in FIG. 3. It is sectional drawing in the magnet roller of another embodiment of this invention. It is a figure which shows an example of the magnetic force pattern of a magnet roller. It is a schematic diagram which shows an example of the magnetic field metal mold
  • FIG. 9 is a sectional view taken along line BB in FIG.
  • the magnet roller 10 of the present invention has two semi-cylindrical resin magnets having annular portions 21 and 31 at one end and shafts 22 and 32 at the other end, respectively. It consists of members 20 and 30.
  • the annular portions 21 and 31 and the shaft portions 22 and 32 may be formed integrally with the cylindrical portion of the roller main body portion during injection molding. However, after the semi-cylindrical member is injection molded, it is separately injected. It can also be formed by joining an annular member formed by molding or the like and a rod-shaped shaft member.
  • the inner diameters of the annular portions 21 and 31 are formed so as to substantially match the outer diameters of the shaft portions 32 and 22, respectively.
  • the annular portion 21 and the annular portion 31 are arranged so as not to oppose each other, and then the semi-cylindrical resin magnet members 20 and 30 are respectively moved in the axial direction ( Slide in the opposite direction so that the shaft portions 32 and 22 are inserted into the annular portions 21 and 31, respectively.
  • the shaft portion 22 of one semi-cylindrical resin magnet member 20 is inserted into the annular portion 31 of the other semi-cylindrical resin magnet member 30, and the annular portion 21 of the one semi-cylindrical resin magnet member 20 is inserted.
  • the shaft portion 32 of the other semi-cylindrical resin magnet member 30 is inserted into the magnet roller 10 so as to be fitted to each other and have shaft portions 22 and 32 at both ends as shown in FIG. Assembled.
  • the semi-cylindrical resin magnet members 20 and 30 are slid in the direction opposite to the above-described assembly direction from the state of FIG. 3, they can be easily disassembled.
  • the magnet roller 10 of the present invention does not require an adhesive bonding step for assembly, and thus the manufacturing process is simple and excellent in economic efficiency. In addition, since no adhesive is used, there is little environmental impact and excellent recyclability.
  • the magnet roller 10 after assembly is formed in a cylindrical shape in which a hollow portion is provided in addition to both end portions in which the shaft portions 22 and 32 are provided in the cross section. Can be greatly reduced and can be manufactured at low cost.
  • the semi-cylindrical resin magnet members 20 and 30 constituting the magnet roller 10 are obtained by kneading a powder such as a ferrite magnet or a rare earth magnet in a binder mainly composed of polyamide, polyphenylene sulfide, polyolefin, ethylene ethyl acrylate copolymer or the like. Each is made of the same material by injection molding of the composition. As shown in FIG. 7 described above, a magnetic field is applied to the composition in the cavity 41 during molding, and the magnet powder in the composition is magnetized and oriented. Thereby, a necessary magnetic pole appears in the longitudinal direction of the outer peripheral surface of the semicylindrical resin magnet member. In order to generate the magnetic field, in addition to the permanent magnet 42, a coil electromagnet or the like can be used. Further, if necessary, additional magnetization or re-magnetization is performed by a magnetizing device.
  • the characteristic configuration of the magnet roller 10 of the present invention is the cross-sectional shape of the one semi-cylindrical resin magnet member 20 in the cross-section of the portion excluding both ends of the magnet roller.
  • the other semi-cylindrical resin magnet member 30 have different cross-sectional shapes and / or the thickness of the one semi-cylindrical resin magnet member 20 and the other semi-cylindrical resin magnet member at least at one location of the cross-section.
  • the thickness of 30 is different from each other. That is, in the magnet roller 10 after assembly, the cross-sectional shape and thickness of the cylindrical portion in which the hollow portion is formed inside the roller by fitting the two semi-cylindrical resin magnet members 20 and 30 are two semi-cylindrical resins.
  • the magnet members 20 and 30 are configured differently.
  • the thickness of the resin magnet member in the said cross section means the thickness of parts other than the location in which the flat part, convex part, recessed part, and notch which are mentioned later were formed.
  • the cross-sectional shape and thickness are newly added as factors for forming a desired magnetic pattern in the manufacturing process. By newly adding such factors, it is possible to form a complicated magnetic pattern relatively easily and at low cost as compared with the conventional magnet roller.
  • two cavities having different shapes and the like are used when they are injection-molded.
  • the two semi-cylindrical resin magnet members 20 and 30 are formed by injection molding so that their cross-sectional shapes and the like are different. In the same members 20 and 30, including the portion provided with, both portions are made of the same material. Therefore, for example, an operation of adding another member, production thereof, and the like are unnecessary, and the mass productivity is extremely excellent.
  • the inner surface shape of the two semi-cylindrical resin magnet members 20, 30, that is, a hollow portion formed inside the roller when the two semi-cylindrical resin magnet members 20, 30 are fitted together.
  • Each of the surface shapes on the side is formed in a semicircular shape.
  • the thickness of one semi-cylindrical resin magnet member 20 and the thickness of the other semi-cylindrical resin magnet member 30 are different from each other in at least one place of the cross section.
  • the dimension r from the inner surface of one semi-cylindrical resin magnet member 20 to the shaft center is different from the dimension r 'from the inner surface of the other semi-cylindrical resin magnet member 30 to the shaft center.
  • the magnet roller 10 is formed so that the hollow portion formed in the roller is divided into two by a straight line passing through the shaft center and the fitting surface, and the respective areas or volumes are different. Thereby, it is comprised so that the thickness of the two semi-cylinder-shaped resin magnet members 20 and 30 may differ in the said cross section. Further, the magnet roller 10 shown in FIG. 4 is configured so that the thicknesses of the two semi-cylindrical resin magnet members 20 and 30 are different from each other, thereby fitting the two semi-cylindrical resin magnet members 20 and 30 together. A step is provided inside the mating surface.
  • the inner shape of the other semi-cylindrical resin magnet member 30 is formed in a semicircular shape.
  • the semi-cylindrical resin magnet member 20 is formed in a different shape from the inner surface shape.
  • the two semi-cylinder-shaped resin magnet members 20 and 30 are comprised so that it may become mutually different cross-sectional shape in the said cross section.
  • the magnet roller 10 has a structure having a hollow portion by fitting two members. Therefore, for example, as in the case of the magnet roller 10 shown in FIGS. 4 and 5A, a factor for forming a desired magnetic pattern while maintaining a cylindrical appearance without changing the shape or the like of the outer peripheral surface of the roller. Thus, it is possible to cope with the formation of a complicated magnetic force pattern.
  • the cross-sectional shape and the like refer to a cross-sectional shape in a cut surface perpendicular to the axial direction.
  • the magnet roller 10 has one semi-cylindrical resin magnet member 20 and / or the other half in the cross section.
  • One or more convex portions or concave portions are formed on the outer peripheral surface of the cylindrical resin magnet member 30. Further, the magnet roller 10 shown in FIGS.
  • 5 (e) and 5 (h) is provided on the outer peripheral surface of one semi-cylindrical resin magnet member 20 and / or the other semi-cylindrical resin magnet member 30 in the cross section. Or two or more notches are formed.
  • These magnet rollers 10 are provided with a flat portion, a concave portion, a notch or a convex portion on the outer peripheral surface of the semi-cylindrical resin magnet members 20 and 30, in addition to the configuration of the magnet roller 10 shown in FIG.
  • the outer surface shape of one semi-cylindrical resin magnet member 20 and the dimension R from the outer surface to the axial center are different from the outer surface shape of the other semi-cylindrical resin magnet member 30 and the dimension R ′ from the outer surface to the axial center.
  • the said cross-sectional shape etc. can be added as a new factor for forming a desired magnetic force pattern. Furthermore, since the outer surface shape and the dimension from the outer surface to the axial center are different, the distance from the aluminum sleeve is also added to these magnet rollers 10 as a new factor for forming a desired magnetic force pattern. It is possible to cope with the formation of a more complicated magnetic pattern. Note that the magnet roller 10 shown in FIG. 5 (i) is provided with a step on the outside of the fitting surface of the two semi-cylindrical resin magnet members 20 and 30. Further, as in the magnet roller 10 shown in FIGS.
  • a recess or a cut is formed on the outer peripheral surface of the resin magnet member. If a notch is formed, in addition to the above effects, a magnetic member having a different magnetic characteristic can be fitted as a magnetic force adjusting material.
  • the magnet roller 10 shown in FIGS. 5 (d) and 5 (f) is formed of a resin magnet member so as to correspond to a flat portion or a recess provided on the outer peripheral surface of the other semi-cylindrical resin magnet member 30.
  • a flat portion or a concave portion is also provided on the inner surface. That is, in addition to the configuration of the magnet roller 10 shown in FIG. 5C and the like, the inner shape of the two resin magnet members is also different as shown in FIG. It can cope with formation of a simple magnetic pattern.
  • the magnet roller according to the present invention has an extremely small number of parts, is easy to assemble, and can easily form a complicated magnetic pattern at a low cost.
  • the magnet roller of the present invention can be used for a developing device and a cleaning device in an image forming apparatus such as a printer, a copying machine, and a facsimile machine that forms an image using toner.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

Provided is a magnetic roller, comprising two semi-cylindrical resin magnetic members, respectively further comprising ring-shaped parts on one end part of each member, and respectively further comprising axle parts on the other end parts of each member. By inserting the axle parts of each semi-cylindrical resin magnetic member into the ring-shaped parts of each semi-cylindrical member, a cylindrical roller is formed which has axle parts on both ends thereof. In a cross-section of a portion of the magnetic roller excluding both end parts thereof, the cross-section shape of one of the semi-cylindrical resin magnetic members and the cross-section shape of the other of the semi-cylindrical resin magnetic members respectively vary, and/or in at least one site of the cross-sections, the thickness of the one of the semi-cylindrical resin magnetic members and the thickness of the other of the semi-cylindrical resin magnetic members respectively vary.

Description

マグネットローラMagnet roller
 本発明は、トナーを使用して画像を形成させる複写機、プリンタ、ファクシミリ等の画像形成装置において、現像装置やクリーニング装置に使用されるマグネットローラに関するものである。なお、本国際出願は、2013年1月15日に出願した日本国特許出願第2013-004489号に基づく優先権を主張するものであり、日本国特許出願第2013-004489号の全内容を本国際出願に援用する。 The present invention relates to a magnet roller used in a developing device or a cleaning device in an image forming apparatus such as a copying machine, a printer, or a facsimile machine that forms an image using toner. This international application claims priority based on Japanese Patent Application No. 2013-004489 filed on January 15, 2013, and the entire contents of Japanese Patent Application No. 2013-004489 are hereby incorporated by reference. Included in international applications.
 粉体からなるトナーによって画像を形成するプリンタ、複写機、ファクシミリ等の画像形成装置において、現像装置やクリーニング装置に、周方向に複数の磁極を有するマグネットローラが使用される。現像装置に使用されるマグネットローラは、感光ドラム表面に形成された静電潜像を帯電トナーで現像する際、回転する筒状のアルミスリーブ内に静止した状態で配置される。そして、このマグネットローラはスリーブ表面に担持したトナーをマグネットローラが有する磁力特性によって飛翔させ、感光ドラム上に供給することで、静電潜像を可視化させるという役目を担うものである。 In image forming apparatuses such as printers, copying machines, and facsimiles that form images with toner made of powder, a magnet roller having a plurality of magnetic poles in the circumferential direction is used for a developing device and a cleaning device. The magnet roller used in the developing device is placed in a stationary state in a rotating cylindrical aluminum sleeve when developing the electrostatic latent image formed on the surface of the photosensitive drum with charged toner. The magnet roller serves to visualize the electrostatic latent image by causing the toner carried on the sleeve surface to fly by the magnetic characteristics of the magnet roller and supplying the toner onto the photosensitive drum.
 一般に、マグネットローラはフェライト或いは希土類の粉体磁石と樹脂を混合した樹脂磁石材料を加熱溶融して、射出成形或いは押出成形により円筒状に賦形して作られる。その際、溶融体に外部から永久磁石或いは電磁石により磁場をかけ、溶融体中の粉体磁石を磁化させると共に磁場の方向に配向させることにより、賦形されたマグネットローラの外周面に、軸方向に平行で、かつ周方向に異なった複数の磁極を発生させる。 Generally, a magnet roller is made by heating and melting a resin magnet material obtained by mixing a ferrite or rare earth powder magnet and a resin, and then forming it into a cylindrical shape by injection molding or extrusion molding. At that time, a magnetic field is applied to the melt from the outside by a permanent magnet or an electromagnet, and the powder magnet in the melt is magnetized and oriented in the direction of the magnetic field, so that the outer peripheral surface of the shaped magnet roller is axially aligned. A plurality of magnetic poles parallel to each other and different in the circumferential direction are generated.
 図6は、マグネットローラ50の軸方向に垂直な横断面における円周上の磁極の磁束密度(磁力)を、円周上から法線方向に引いた線分の長さで表し、線分の頂点を結んだ曲線を示したもので、一般にマグネットローラの磁力パターンと呼ばれる。マグネットローラの磁極は、複数のN極とS極からなり、これらの総数は一般に奇数になる場合が多い。顧客の要求する種々の磁力パターンをマグネットローラ上に迅速且つ正確に具現することが、マグネットローラメーカーの最重要技術の一つである。 FIG. 6 shows the magnetic flux density (magnetic force) of the magnetic pole on the circumference in the cross section perpendicular to the axial direction of the magnet roller 50 as the length of the line segment drawn in the normal direction from the circumference. It shows a curve connecting the vertices and is generally called a magnetic pattern of a magnet roller. The magnetic pole of the magnet roller is composed of a plurality of N poles and S poles, and the total number of these is generally an odd number. One of the most important technologies of a magnet roller manufacturer is to quickly and accurately implement various magnetic patterns required by customers on the magnet roller.
 例えば、所望の磁力パターンを有するマグネットローラを射出成形で作るには、金型のキャビティ内の溶融樹脂に好ましい磁場をかけるため、図7のように、キャビティ41周りに配置する永久磁石42の磁気特性、形状、寸法、位置を検討して磁場金型を設計する。この磁場金型の設計と、これに続くマグネットローラの成形、評価、要すれば金型の修正等の手順を出来るだけ簡略化するため、磁場解析シミュレーション技術が駆使される。 For example, in order to produce a magnet roller having a desired magnetic force pattern by injection molding, a magnetic field of a permanent magnet 42 arranged around the cavity 41 is applied as shown in FIG. Design the magnetic field mold by considering the characteristics, shape, dimensions and position. Magnetic field analysis simulation technology is used to simplify the design of the magnetic field mold and subsequent steps such as molding and evaluation of the magnet roller and, if necessary, correction of the mold as much as possible.
 従来、このようなマグネットローラとして、例えば図8,9に示すように、断面が扇形の形状を有する複数のマグネットピース52を、接着剤等を用いてシャフト51に一体的に貼り付けることで一つの円柱状のローラに形成したマグネットローラ50が広く知られている。しかし、このマグネットローラ50は、複数のマグネットピース52をシャフト51に貼り付けて組み立てられるという構造上、組立の際に複数のピースが正確な位置からズレて貼り付けられ、これにより、予定していた所望の磁力パターンが得られない等の不具合が起こる場合があった。そのため、組み立て作業性が容易でないという課題があった。 Conventionally, as such a magnet roller, for example, as shown in FIGS. 8 and 9, a plurality of magnet pieces 52 having a fan-shaped cross section are integrally attached to a shaft 51 using an adhesive or the like. A magnet roller 50 formed on two cylindrical rollers is widely known. However, because the magnet roller 50 is assembled by attaching a plurality of magnet pieces 52 to the shaft 51, the plurality of pieces are attached with an offset from an accurate position during assembly. In some cases, a desired magnetic pattern cannot be obtained. Therefore, there has been a problem that assembly workability is not easy.
 こういった問題を解消するため、一対の半円筒状の半割り部材を一体的に組み合わせて形成される中空磁性ローラが開示されている(例えば、特許文献1参照。)。また、本出願人は、先の出願において、2つに分割された細長い半円筒状の樹脂磁石を組合わせて形成した両端に軸部を有する円筒状のマグネットローラや、環状部と軸部を有することで嵌合精度を更に向上させた2つの半円筒状部材から構成されるマグネットローラ等を提案している(例えば、特許文献2,3参照。)。 In order to solve these problems, a hollow magnetic roller formed by integrally combining a pair of semi-cylindrical half members has been disclosed (for example, see Patent Document 1). In addition, in the previous application, the applicant of the present application has a cylindrical magnet roller having a shaft portion at both ends formed by combining elongated semi-cylindrical resin magnets divided into two, an annular portion and a shaft portion. It has proposed a magnet roller or the like composed of two semi-cylindrical members that have further improved fitting accuracy by having (see, for example, Patent Documents 2 and 3).
 これらのマグネットローラは、いずれも非常に少ない数のパーツで構成されており、主に2つの半円筒状の樹脂磁石を嵌合することによって組み立てられ、両端に突出する軸も樹脂磁石の端部を利用して作られる。そのため、上述した図8,9に示すマグネットローラ50のように、組立の際に複数のピースが位置ズレを起こす不具合等も起こりにくく、組立作業が非常に容易であるという点で優れている。更に、中空構造を有することで部材が節減され、製造コストの低下を図ることもでき、また接着剤等を使用しないためリサイクル特性にも優れる。 Each of these magnet rollers is made up of a very small number of parts, and is assembled mainly by fitting two semi-cylindrical resin magnets. Made using. Therefore, unlike the magnet roller 50 shown in FIGS. 8 and 9 described above, it is excellent in that the assembling work is very easy because it is difficult for a plurality of pieces to be misaligned during assembly. Further, the hollow structure can reduce the number of members, reduce the manufacturing cost, and is excellent in recycling characteristics because no adhesive or the like is used.
特許第2801878号公報(請求項1、段落[0007])Japanese Patent No. 2801878 (Claim 1, paragraph [0007]) 特許第3061361号公報(請求項1、段落[0008]、段落[0009])Japanese Patent No. 3061361 (Claim 1, paragraph [0008], paragraph [0009]) 特開2006-18189号公報(請求項1,4、段落[0024])JP 2006-18189 A (Claims 1 and 4, paragraph [0024])
 上記特許文献1~3等に示される従来のマグネットローラでは、その製造過程において所望の磁力パターンを形成するための主要な因子として、上述の磁場金型に設置される永久磁石の磁気特性やその形状、寸法或いはその設置位置の他、マグネットローラの樹脂磁石部材に用いられる材料自体の磁気特性、或いは樹脂磁石部材に形成される他磁極の強さやその位置関係等が考慮されてきた。しかし、顧客から要求される磁力パターンは、近年、益々複雑化する傾向にあり、これらの因子だけを操作して製造された従来のマグネットローラでは、より複雑な磁力パターンの形成に十分に対応しきれない場合がある。或いは、対応できた場合であっても、上述のマグネットローラを成形する際の磁場金型の設計作業等が非常に複雑になり、迅速に対応できないといった問題が生じている。 In the conventional magnet rollers shown in Patent Documents 1 to 3 and the like, as a main factor for forming a desired magnetic pattern in the manufacturing process, the magnetic characteristics of the permanent magnet installed in the magnetic field mold and the In addition to the shape, size, and installation position thereof, the magnetic characteristics of the material itself used for the resin magnet member of the magnet roller, the strength of the other magnetic pole formed on the resin magnet member, and the positional relationship thereof have been considered. However, the magnetic pattern required by customers has been becoming increasingly complex in recent years, and conventional magnet rollers manufactured by manipulating only these factors can sufficiently cope with the formation of more complicated magnetic patterns. There are cases where it cannot be completed. Alternatively, even if it is possible to cope with it, the magnetic field mold design work or the like when forming the above-described magnet roller becomes very complicated, and there is a problem that it cannot be handled quickly.
 そこで、本発明者らは鋭意研究を重ねた結果、中空構造を有するマグネットローラにおいて、その断面形状等が所望の磁力パターンを形成するための新たな因子になり得ることを見出し、これにより、上述の特許文献1~3のマグネットローラのような組立の容易さは維持しつつも、より複雑な磁力パターンの形成を、より簡略に、かつ低コストで達成できる本発明に至ったものである。 Therefore, as a result of intensive studies, the present inventors have found that the cross-sectional shape and the like can be a new factor for forming a desired magnetic force pattern in a magnet roller having a hollow structure. Thus, the present invention has achieved the present invention which can achieve the formation of a more complicated magnetic pattern more simply and at low cost while maintaining the ease of assembly such as the magnet roller disclosed in US Pat.
 本発明の目的は、パーツ数が極めて少なく、組み立てが容易であって、しかも容易に、かつ低コストで複雑な磁力パターンの形成を行うことができるマグネットローラを提供することにある。 An object of the present invention is to provide a magnet roller that has an extremely small number of parts, is easy to assemble, and can easily form a complex magnetic pattern at low cost.
 本発明の第1の観点は、一方の端部に環状部をそれぞれ有し、他方の端部に軸部をそれぞれ有する2つの半筒状樹脂磁石部材を備え、一方の半筒状樹脂磁石部材の軸部を、他方の半筒状樹脂磁石部材の環状部に挿入して嵌合することによって、両端部のそれぞれに軸部を有する筒状ローラが形成されるマグネットローラであって、該マグネットローラの両端部を除いた部分の断面において上記一方の半筒状樹脂磁石部材の断面形状と上記他方の半筒状樹脂磁石部材の断面形状が互いに異なるか及び/又は上記断面の少なくとも一箇所において上記一方の半筒状樹脂磁石部材の厚みと上記他方の半筒状樹脂磁石部材の厚みが互いに異なることを特徴とする。 A first aspect of the present invention includes two semi-cylindrical resin magnet members each having an annular portion at one end and a shaft portion at the other end, and one semi-cylindrical resin magnet member. Is inserted into the annular part of the other semi-cylindrical resin magnet member, and a cylindrical roller having a shaft part is formed at each of both end parts. The cross-sectional shape of the one semi-cylindrical resin magnet member and the cross-sectional shape of the other semi-cylindrical resin magnet member are different from each other in the cross-section of the portion excluding both ends of the roller and / or at least at one location of the cross-section. The thickness of the one half cylindrical resin magnet member and the thickness of the other half cylindrical resin magnet member are different from each other.
 本発明の第2の観点は、第1の観点に基づく発明であって、更に上記断面において上記一方の半筒状樹脂磁石部材の内面形状と他方の半筒状樹脂磁石部材の内面形状が互いに異なるか及び/又は上記断面の少なくとも一箇所において一方の半筒状樹脂磁石部材の内面から軸心までの寸法と上記他方の半筒状樹脂磁石部材の内面から軸心までの寸法が互いに異なることを特徴とする。 A second aspect of the present invention is an invention based on the first aspect, and further, in the cross section, the inner surface shape of the one semi-cylindrical resin magnet member and the inner surface shape of the other semi-cylindrical resin magnet member are And / or the dimension from the inner surface to the axial center of one semi-cylindrical resin magnet member and the dimension from the inner surface to the axial center of the other semi-cylindrical resin magnet member are different from each other in at least one place of the cross section. It is characterized by.
 本発明の第3の観点は、第1の観点に基づく発明であって、更に上記断面において上記一方の半筒状樹脂磁石部材の外面形状と他方の半筒状樹脂磁石部材の外面形状が互いに異なるか及び/又は上記断面の少なくとも一箇所において一方の半筒状樹脂磁石部材の外面から軸心までの寸法と上記他方の半筒状樹脂磁石部材の外面から軸心までの寸法が互いに異なることを特徴とする。 A third aspect of the present invention is an invention based on the first aspect, wherein the outer surface shape of the one semi-cylindrical resin magnet member and the outer surface shape of the other semi-cylindrical resin magnet member in the cross section are the same. And / or the dimension from the outer surface of one semi-cylindrical resin magnet member to the axial center and the dimension from the outer surface to the axial center of the other semi-cylindrical resin magnet member are different from each other in at least one place of the cross section. It is characterized by.
 本発明の第4の観点は、第1の観点に基づく発明であって、更に上記断面において少なくとも上記一方の半筒状樹脂磁石部材の断面形状が半円筒でない異形を有することを特徴とする。 The fourth aspect of the present invention is the invention based on the first aspect, and is characterized in that the cross-sectional shape of at least one of the semi-cylindrical resin magnet members is not a semi-cylindrical shape in the cross-section.
 本発明の第5の観点は、第1の観点に基づく発明であって、更に上記断面において上記一方の半筒状樹脂磁石部材と上記他方の半筒状樹脂磁石部材との内側又は外側の嵌合面に段差を有することを特徴とする。 A fifth aspect of the present invention is an invention based on the first aspect, and further includes an inner or outer fit between the one semi-cylindrical resin magnet member and the other semi-cylindrical resin magnet member in the cross section. It has a step on the mating surface.
 本発明の第6の観点は、第1の観点に基づく発明であって、更に上記断面において上記一方の半筒状樹脂磁石部材の厚み及び/又は上記他方の部材の厚みが均一であることを特徴とする。 A sixth aspect of the present invention is the invention based on the first aspect, wherein the thickness of the one semi-cylindrical resin magnet member and / or the thickness of the other member is uniform in the cross section. Features.
 本発明の第7の観点は、第1の観点に基づく発明であって、更に上記断面において上記一方の半筒状樹脂磁石部材及び/又は上記他方の半筒状樹脂磁石部材の外周面に、1又は2以上の平坦部が形成されたことを特徴とする。 A seventh aspect of the present invention is the invention based on the first aspect, and further on the outer peripheral surface of the one half-cylinder resin magnet member and / or the other half-cylinder resin magnet member in the cross section, One or more flat portions are formed.
 本発明の第8の観点は、第1の観点に基づく発明であって、更に上記断面において上記一方の半筒状樹脂磁石部材及び/又は上記他方の半筒状樹脂磁石部材の外周面に、1又は2以上の凸部又は凹部が形成されたことを特徴とする。 An eighth aspect of the present invention is the invention based on the first aspect, and further on the outer peripheral surface of the one half-cylinder resin magnet member and / or the other half-cylinder resin magnet member in the cross section, One or more convex portions or concave portions are formed.
 本発明の第9の観点は、第1の観点に基づく発明であって、更に上記断面において上記一方の半筒状樹脂磁石部材及び/又は上記他方の半筒状樹脂磁石部材の外周面に、1又は2以上の切欠きが形成されたことを特徴とする。 A ninth aspect of the present invention is the invention based on the first aspect, and further on the outer peripheral surface of the one half-cylinder resin magnet member and / or the other half-cylinder resin magnet member in the cross section, One or two or more notches are formed.
 本発明の第1の観点のマグネットローラは、一方の端部に環状部をそれぞれ有し、他方の端部に軸部をそれぞれ有する2つの半筒状樹脂磁石部材を備え、一方の半筒状樹脂磁石部材の軸部を、他方の半筒状樹脂磁石部材の環状部に挿入して嵌合することによって、両端部のそれぞれに軸部を有する筒状ローラが形成されるマグネットローラであって、該マグネットローラの両端部を除いた部分の断面において上記一方の半筒状樹脂磁石部材の断面形状と上記他方の半筒状樹脂磁石部材の断面形状が互いに異なるか及び/又は上記断面の少なくとも一箇所において上記一方の半筒状樹脂磁石部材の厚みと上記他方の半筒状樹脂磁石部材の厚みが互いに異なるように構成される。このように、本発明のマグネットローラは、上記断面において同形同大の半円筒形状を有する2つの部材から構成された従来のマグネットローラを改良したものであり、所望の磁力パターンを形成するための因子として、上記断面形状及び厚み等を新たに加えたものである。これにより、従来のマグネットローラに比べ、より複雑な磁力パターンの形成に対応することができる。また、上記2つの半筒状樹脂磁石部材間の断面形状や厚みの違いは、射出成形の際に用いられる金型の形状を変更することにより行うことができるので、比較的容易に、かつ低コストで複雑な磁力パターンの構築に対応できる。また、特に接着剤による貼り付け工程が必要でないため、組立工程やリサイクル時の解体作業がシンプルで、経済的、環境的にも非常に優れる。 A magnet roller according to a first aspect of the present invention includes two semi-cylindrical resin magnet members each having an annular portion at one end and a shaft portion at the other end, and is provided with one semi-cylindrical shape. A magnet roller in which a cylindrical roller having a shaft portion is formed at each of both ends by inserting and fitting the shaft portion of the resin magnet member into the annular portion of the other semi-cylindrical resin magnet member. The cross-sectional shape of the one semi-cylindrical resin magnet member and the cross-sectional shape of the other semi-cylindrical resin magnet member are different from each other in the cross-section of the portion excluding both ends of the magnet roller and / or at least of the cross-section. In one place, the thickness of the one semi-cylindrical resin magnet member and the thickness of the other semi-cylindrical resin magnet member are different from each other. Thus, the magnet roller of the present invention is an improvement over the conventional magnet roller composed of two members having the same shape and the same size of the semi-cylindrical shape in the cross section, in order to form a desired magnetic force pattern. As a factor, the above-mentioned cross-sectional shape and thickness are newly added. Thereby, compared with the conventional magnet roller, it can respond to formation of a more complicated magnetic force pattern. Further, the difference in cross-sectional shape and thickness between the two semi-cylindrical resin magnet members can be performed by changing the shape of the mold used in the injection molding, so that it is relatively easy and low. It can cope with the construction of complicated magnetic patterns at low cost. In addition, since a bonding process using an adhesive is not required, the assembly process and the dismantling work at the time of recycling are simple, and the process is extremely economical and environmentally superior.
 本発明の第2の観点のマグネットローラは、上記断面において上記一方の半筒状樹脂磁石部材の内面形状と他方の半筒状樹脂磁石部材の内面形状が互いに異なるか及び/又は上記断面の少なくとも一箇所において一方の半筒状樹脂磁石部材の内面から軸心までの寸法と上記他方の半筒状樹脂磁石部材の内面から軸心までの寸法が互いに異なるように構成される。このマグネットローラでは、2つの上記半筒状樹脂磁石部材が嵌合したときにローラ内部に形成される中空部側の表面形状が2つの部材間で異なるように形成されることで、上記断面形状が2つの部材間で異なるように構成される。また、上記断面の少なくとも一箇所において半筒状樹脂磁石部材の内面から軸心までの寸法が異なるように、即ちローラ内部に形成される中空部を軸心と嵌合面を通る直線で2つに分割したときの中空部の面積或いは容積がそれぞれ異なるように形成されることで、2つの樹脂磁石部材の厚みが異なるように構成される。これにより、マグネットローラの外周面の形状等は変更しなくても、上記断面形状や厚みを所望の磁力パターンを形成するための新たな因子として追加され得る。また、2つの樹脂磁石部材の厚みを異なるように構成するにあたって、例えば従来のマグネットローラのものより厚みを薄くする場合等には、磁力を弱く制御できる一方、樹脂磁石部材の製造に用いられる磁石材料の節減にもなり、生産コストの面にも優れる。 In the magnet roller according to the second aspect of the present invention, the inner surface shape of the one semi-cylindrical resin magnet member and the inner surface shape of the other semi-cylindrical resin magnet member are different from each other in the cross section and / or at least of the cross section. In one place, the dimension from the inner surface of one semi-cylindrical resin magnet member to the axial center and the dimension from the inner surface of the other semi-cylindrical resin magnet member to the axial center are different from each other. In this magnet roller, when the two half-cylindrical resin magnet members are fitted, the surface shape of the hollow portion side formed inside the roller is formed to be different between the two members. Are configured to be different between the two members. Further, two hollow portions formed in the roller so as to have different dimensions from the inner surface to the shaft center of the semi-cylindrical resin magnet member in at least one place of the cross section, that is, two straight lines passing through the shaft center and the fitting surface. By forming the hollow portions so as to have different areas or volumes, the two resin magnet members are configured to have different thicknesses. Accordingly, the cross-sectional shape and thickness can be added as a new factor for forming a desired magnetic pattern without changing the shape or the like of the outer peripheral surface of the magnet roller. Further, when the two resin magnet members are configured to have different thicknesses, for example, when the thickness is made thinner than that of the conventional magnet roller, the magnetic force can be controlled to be weak, while the magnet used for manufacturing the resin magnet member It also saves material and is excellent in terms of production cost.
 本発明の第3の観点のマグネットローラは、上記断面において上記一方の半筒状樹脂磁石部材の外面形状と他方の半筒状樹脂磁石部材の外面形状が互いに異なるか及び/又は上記断面の少なくとも一箇所において一方の半筒状樹脂磁石部材の外面から軸心までの寸法と上記他方の半筒状樹脂磁石部材の外面から軸心までの寸法が互いに異なるように構成される。このマグネットローラでは、半筒状樹脂磁石部材の外面形状、即ち2つの樹脂磁石部材が嵌合したときのローラ外周面の形状が2の樹脂磁石部材の部分で異なるように形成されることで、上記断面形状が異なるように構成される。また、半筒状樹脂磁石部材の外面から軸心までの寸法が異なるように形成されることで、2つの樹脂磁石部材の厚みが異なるように構成される。これにより、マグネットローラの内側の形状等は変更しなくても、或いはそれらとの併用により上記断面形状や厚みを所望の磁力パターンを形成するための新たな因子として加えることができる。また、外面形状や、外面から軸心までの寸法が異なるように構成されることで、アルミスリーブとの距離も所望の磁力パターンを形成するための新たな因子として加えることができる。また、2つの樹脂磁石部材の厚みを異なるように構成するに当たって、例えば従来のマグネットローラのものより厚みを薄くする場合等には、樹脂磁石部材の製造に用いられる磁石材料の節減にもなり、生産コストの面にも優れる。 In the magnet roller according to the third aspect of the present invention, the outer surface shape of the one semi-cylindrical resin magnet member and the outer surface shape of the other semi-cylindrical resin magnet member are different from each other in the cross section and / or at least in the cross section. In one place, the dimension from the outer surface of one semi-cylindrical resin magnet member to the axis is different from the dimension from the outer surface of the other semi-cylindrical resin magnet member to the axis. In this magnet roller, the outer surface shape of the semi-cylindrical resin magnet member, that is, the shape of the outer peripheral surface of the roller when the two resin magnet members are fitted is different in the portion of the two resin magnet members, It is comprised so that the said cross-sectional shape may differ. Moreover, it is comprised so that the thickness of two resin magnet members may differ by forming so that the dimension from the outer surface of a semi-cylindrical resin magnet member to an axial center may differ. As a result, the shape and thickness of the cross section and the thickness can be added as new factors for forming a desired magnetic force pattern without changing the inner shape or the like of the magnet roller or in combination with them. Further, since the outer surface shape and the dimension from the outer surface to the axial center are different, the distance from the aluminum sleeve can also be added as a new factor for forming a desired magnetic force pattern. In addition, in configuring the two resin magnet members to have different thicknesses, for example, when making the thickness thinner than that of the conventional magnet roller, it also saves the magnet material used in the production of the resin magnet member, Excellent production cost.
 本発明の第4の観点のマグネットローラは、上記断面において少なくとも上記一方の半筒状樹脂磁石部材の断面形状が半円筒でない異形を有する。また、本発明の第5の観点のマグネットローラは、上記断面において上記一方の半筒状樹脂磁石部材と上記他方の半筒状樹脂磁石部材との内側又は外側の嵌合面に段差を有する。これらのマグネットローラは上記本発明の第1ないし第3の観点のマグネットローラのより具体的な形態を示すものであり、これによって上記断面形状や厚み、或いはマグネットローラの外周面からアルミスリーブまでの距離が、所望の磁力パターンを形成するための新たな因子として加えられ、より複雑な磁力パターンの構築に容易に対応され得る。 In the magnet roller according to the fourth aspect of the present invention, at least one of the semi-cylindrical resin magnet members has a non-cylindrical shape in the cross section. Moreover, the magnet roller of the 5th viewpoint of this invention has a level | step difference in the inner or outer fitting surface of said one half cylindrical resin magnet member and said other half cylindrical resin magnet member in the said cross section. These magnet rollers show a more specific form of the magnet roller according to the first to third aspects of the present invention, whereby the cross-sectional shape and thickness, or from the outer peripheral surface of the magnet roller to the aluminum sleeve. The distance can be added as a new factor to create the desired magnetic pattern and can easily accommodate the construction of more complex magnetic patterns.
 本発明の第6の観点のマグネットローラは、上記断面において上記一方の半筒状樹脂磁石部材の厚み及び/又は上記他方の部材の厚みが均一であるように構成されることで、射出成形後の樹脂磁石部材が反りにくくなるため、樹脂磁石部材の嵌合作業が容易であり、嵌合体の寸法精度が出しやすい。 The magnet roller according to the sixth aspect of the present invention is configured so that the thickness of the one semi-cylindrical resin magnet member and / or the thickness of the other member is uniform in the cross section, after injection molding. Since the resin magnet member is less likely to warp, the fitting operation of the resin magnet member is easy, and the dimensional accuracy of the fitting body is easily obtained.
 本発明の第7の観点のマグネットローラでは、上記一方の半筒状樹脂磁石部材及び/又は上記他方の半筒状樹脂磁石部材の外周面に、断面形状において1又は2以上の平坦部が形成される。また、本発明の第8の観点のマグネットローラでは、上記一方の半筒状樹脂磁石部材及び/又は上記他方の半筒状樹脂磁石部材の外周面に、断面形状において1又は2以上の凸部又は凹部が形成される。また、本発明の第9の観点のマグネットローラでは、上記一方の半筒状樹脂磁石部材及び/又は上記他方の半筒状樹脂磁石部材の外周面に、断面形状において1又は2以上の切欠きが形成される。外周面側に設けられる平坦部、凹部、切欠き又は凸部は、特に樹脂磁石部材の外周面とアルミスリーブとの距離に直接影響するため、磁極の強さを調整するのに有効であり、より複雑な磁極パターンの形成に対応できる。また、上記凹部や切欠きは、磁気特性の違う磁性部材を磁力調整材としてはめ込む際に利用することもできる。 In the magnet roller according to the seventh aspect of the present invention, one or more flat portions are formed in the cross-sectional shape on the outer peripheral surface of the one semi-cylindrical resin magnet member and / or the other semi-cylindrical resin magnet member. Is done. In the magnet roller according to the eighth aspect of the present invention, one or more convex portions in the cross-sectional shape are formed on the outer peripheral surface of the one semi-cylindrical resin magnet member and / or the other semi-cylindrical resin magnet member. Or a recessed part is formed. In the magnet roller according to the ninth aspect of the present invention, one or more notches in the cross-sectional shape are formed on the outer peripheral surface of the one semi-cylindrical resin magnet member and / or the other semi-cylindrical resin magnet member. Is formed. Since the flat part, concave part, notch or convex part provided on the outer peripheral surface side directly affects the distance between the outer peripheral surface of the resin magnet member and the aluminum sleeve, it is effective for adjusting the strength of the magnetic pole, It can cope with the formation of more complicated magnetic pole patterns. Moreover, the said recessed part and notch can also be utilized when inserting the magnetic member from which a magnetic characteristic differs as a magnetic force adjustment material.
本発明実施形態のマグネットローラの組立前の状態を示す斜視図である。It is a perspective view which shows the state before the assembly of the magnet roller of this invention embodiment. 本発明実施形態のマグネットローラの組立中の一工程を示す斜視図である。It is a perspective view which shows 1 process during the assembly of the magnet roller of this invention embodiment. 本発明実施形態のマグネットローラの組立後の状態を示す斜視図である。It is a perspective view which shows the state after the assembly of the magnet roller of this invention embodiment. 図3におけるA-A線断面図である。FIG. 4 is a sectional view taken along line AA in FIG. 3. 本発明の別の実施形態のマグネットローラにおける断面図である。It is sectional drawing in the magnet roller of another embodiment of this invention. マグネットローラの磁力パターンの一例を示す図である。It is a figure which shows an example of the magnetic force pattern of a magnet roller. キャビティ周りに永久磁石を配置して形成された磁場金型の一例を示す模式図である。It is a schematic diagram which shows an example of the magnetic field metal mold | die formed by arrange | positioning a permanent magnet around a cavity. 従来のマグネットローラを示す斜視図である。It is a perspective view which shows the conventional magnet roller. 図8におけるB-B線断面図である。FIG. 9 is a sectional view taken along line BB in FIG.
 次に本発明を実施するための形態を図面に基づいて説明する。 Next, modes for carrying out the present invention will be described with reference to the drawings.
 図1に示すように、本発明のマグネットローラ10は、一方の端部に環状部21,31をそれぞれ有し、他方の端部に軸部22,32をそれぞれ有する2つの半筒状樹脂磁石部材20,30から構成される。環状部21,31と軸部22,32は、射出成形の際に、ローラ本体部分の筒状部に一体的に形成されても良いが、半筒状の部材を射出成形した後に、別途射出成形等により形成した環状部材と棒状の軸部材を接合することによって形成することもできる。 As shown in FIG. 1, the magnet roller 10 of the present invention has two semi-cylindrical resin magnets having annular portions 21 and 31 at one end and shafts 22 and 32 at the other end, respectively. It consists of members 20 and 30. The annular portions 21 and 31 and the shaft portions 22 and 32 may be formed integrally with the cylindrical portion of the roller main body portion during injection molding. However, after the semi-cylindrical member is injection molded, it is separately injected. It can also be formed by joining an annular member formed by molding or the like and a rod-shaped shaft member.
 環状部21,31の内径は、それぞれ軸部32,22の外径とほぼ一致するように形成される。マグネットローラ10を組み立てるには、図2のように、環状部21と環状部31とを相対向しないように配置して合わせた後、半筒状樹脂磁石部材20,30を、それぞれ軸方向(軸部22,32に水平な直線方向)に、かつ環状部21,31に軸部32,22がそれぞれ挿入されるよう反対方向にスライドさせる。これにより、一方の半筒状樹脂磁石部材20の軸部22が、他方の半筒状樹脂磁石部材30の環状部31に挿入され、また一方の半筒状樹脂磁石部材20の環状部21に、他方の半筒状樹脂磁石部材30の軸部32が挿入されることで互いに嵌合し、図3に示すような両端部のそれぞれに軸部22,32を有する1本のマグネットローラ10に組み立てられる。一方、図3の状態から、半筒状樹脂磁石部材20,30を、それぞれ上述の組立方向とは逆の方向にスライドさせれば、容易に分解することもできる。このように、本発明のマグネットローラ10は、組立に、接着剤による貼り付け工程が必要ないので、製造工程がシンプルで経済性に優れる。また、接着剤を使用しないため、環境負荷が少なく、リサイクル性にも優れる。 The inner diameters of the annular portions 21 and 31 are formed so as to substantially match the outer diameters of the shaft portions 32 and 22, respectively. In order to assemble the magnet roller 10, as shown in FIG. 2, the annular portion 21 and the annular portion 31 are arranged so as not to oppose each other, and then the semi-cylindrical resin magnet members 20 and 30 are respectively moved in the axial direction ( Slide in the opposite direction so that the shaft portions 32 and 22 are inserted into the annular portions 21 and 31, respectively. As a result, the shaft portion 22 of one semi-cylindrical resin magnet member 20 is inserted into the annular portion 31 of the other semi-cylindrical resin magnet member 30, and the annular portion 21 of the one semi-cylindrical resin magnet member 20 is inserted. The shaft portion 32 of the other semi-cylindrical resin magnet member 30 is inserted into the magnet roller 10 so as to be fitted to each other and have shaft portions 22 and 32 at both ends as shown in FIG. Assembled. On the other hand, if the semi-cylindrical resin magnet members 20 and 30 are slid in the direction opposite to the above-described assembly direction from the state of FIG. 3, they can be easily disassembled. Thus, the magnet roller 10 of the present invention does not require an adhesive bonding step for assembly, and thus the manufacturing process is simple and excellent in economic efficiency. In addition, since no adhesive is used, there is little environmental impact and excellent recyclability.
 また、組立後のマグネットローラ10は、図4に示すように、その断面において、軸部22,32が設けられた両端部以外に中空部が設けられた筒状に形成されるため、樹脂材料が大幅に低減され、低コストで製造できる。 Further, as shown in FIG. 4, the magnet roller 10 after assembly is formed in a cylindrical shape in which a hollow portion is provided in addition to both end portions in which the shaft portions 22 and 32 are provided in the cross section. Can be greatly reduced and can be manufactured at low cost.
 マグネットローラ10を構成する半円筒状樹脂磁石部材20,30は、ポリアミド、ポリフェニレンサルファイド、ポリオレフィン、エチレンエチルアクリレート共重合体などを主成分とするバインダーに、フェライト磁石或いは希土類磁石等の粉末を混練した組成物の射出成形等によりそれぞれ同材質に作られる。上述の図7に示すように、成形時にキャビティ41内の組成物に磁場がかけられて、組成物中の磁石粉末が磁化、配向する。これにより、半円筒状樹脂磁石部材の外周面の長手方向に必要な磁極が発現する。上記磁場を発生させるには永久磁石42を用いるほか、コイル電磁石等を利用することができる。また、必要によって着磁装置により追着磁或いは再着磁される。 The semi-cylindrical resin magnet members 20 and 30 constituting the magnet roller 10 are obtained by kneading a powder such as a ferrite magnet or a rare earth magnet in a binder mainly composed of polyamide, polyphenylene sulfide, polyolefin, ethylene ethyl acrylate copolymer or the like. Each is made of the same material by injection molding of the composition. As shown in FIG. 7 described above, a magnetic field is applied to the composition in the cavity 41 during molding, and the magnet powder in the composition is magnetized and oriented. Thereby, a necessary magnetic pole appears in the longitudinal direction of the outer peripheral surface of the semicylindrical resin magnet member. In order to generate the magnetic field, in addition to the permanent magnet 42, a coil electromagnet or the like can be used. Further, if necessary, additional magnetization or re-magnetization is performed by a magnetizing device.
 そして、本発明のマグネットローラ10の特徴ある構成は、図1,図4に示すように、該マグネットローラの両端部を除いた部分の断面において上記一方の半筒状樹脂磁石部材20の断面形状と上記他方の半筒状樹脂磁石部材30の断面形状が互いに異なるか及び/又は上記断面の少なくとも一箇所において上記一方の半筒状樹脂磁石部材20の厚みと上記他方の半筒状樹脂磁石部材30の厚みが互いに異なるように構成されることにある。即ち、組立後のマグネットローラ10において、2つの半筒状樹脂磁石部材20,30の嵌合によってローラ内部に中空部が形成される筒状部の断面形状や厚みが、2つの半筒状樹脂磁石部材20,30で異なるように構成される。なお、本明細書において、上記断面における樹脂磁石部材の厚みとは、後述する平坦部、凸部、凹部、切欠きが形成された箇所以外の部分の厚みをいう。 1 and FIG. 4, the characteristic configuration of the magnet roller 10 of the present invention is the cross-sectional shape of the one semi-cylindrical resin magnet member 20 in the cross-section of the portion excluding both ends of the magnet roller. And the other semi-cylindrical resin magnet member 30 have different cross-sectional shapes and / or the thickness of the one semi-cylindrical resin magnet member 20 and the other semi-cylindrical resin magnet member at least at one location of the cross-section. The thickness of 30 is different from each other. That is, in the magnet roller 10 after assembly, the cross-sectional shape and thickness of the cylindrical portion in which the hollow portion is formed inside the roller by fitting the two semi-cylindrical resin magnet members 20 and 30 are two semi-cylindrical resins. The magnet members 20 and 30 are configured differently. In addition, in this specification, the thickness of the resin magnet member in the said cross section means the thickness of parts other than the location in which the flat part, convex part, recessed part, and notch which are mentioned later were formed.
 本発明のマグネットローラ10は、その製造過程において所望の磁力パターンを形成するための因子として、上記断面形状や厚み等が新たに加えられたものである。このような因子が新たに加えられたことにより、従来のマグネットローラに比べ、複雑な磁力パターンの形成を比較的容易に、かつ低コストで行うことができる。2つの半筒状樹脂磁石部材20,30を、互いに異なる断面形状等になるように形成するには、これらを射出成形する際に、それぞれ形状等が異なる2つのキャビティを用いる。このように、本発明のマグネットローラ10では、射出成形によって2つの半筒状樹脂磁石部材20,30を、その断面形状等が異なるように形成するため、後述する凹部や凸部、切欠き等が設けられている部分も含めて、同一の部材20,30内においてはいずれの部分も同材質で構成される。そのため、例えば他の部材を付加する作業や、それらの製造等が不要であり、非常に量産性に優れる。 In the magnet roller 10 of the present invention, the cross-sectional shape and thickness are newly added as factors for forming a desired magnetic pattern in the manufacturing process. By newly adding such factors, it is possible to form a complicated magnetic pattern relatively easily and at low cost as compared with the conventional magnet roller. In order to form the two semi-cylindrical resin magnet members 20 and 30 so as to have different cross-sectional shapes and the like, two cavities having different shapes and the like are used when they are injection-molded. As described above, in the magnet roller 10 of the present invention, the two semi-cylindrical resin magnet members 20 and 30 are formed by injection molding so that their cross-sectional shapes and the like are different. In the same members 20 and 30, including the portion provided with, both portions are made of the same material. Therefore, for example, an operation of adding another member, production thereof, and the like are unnecessary, and the mass productivity is extremely excellent.
  図4に示すマグネットローラ10では、2つの半筒状樹脂磁石部材20,30の内面形状、即ち2つの半筒状樹脂磁石部材20,30が嵌合したときにローラ内部に形成される中空部側の表面形状はいずれも半円状に形成されている。一方、上記断面の少なくとも一箇所において一方の半筒状樹脂磁石部材20の厚みと他方の半筒状樹脂磁石部材30の厚みが互いに異なるように構成されている。そして、一方の半筒状樹脂磁石部材20の内面から軸心までの寸法rと他方の半筒状樹脂磁石部材30の内面から軸心までの寸法r’が異なるように構成される。即ち、このマグネットローラ10では、ローラ内部に形成される中空部を軸心と嵌合面を通る直線で2つに分割したそれぞれの面積或いは容積が異なるように形成される。これにより、上記断面において2つの半筒状樹脂磁石部材20,30の厚みが異なるように構成されている。また、図4に示すマグネットローラ10は、このように2つの半筒状樹脂磁石部材20,30の厚みが異なるように構成されることで、2つの半筒状樹脂磁石部材20,30の嵌合面の内側に段差が設けられている。 In the magnet roller 10 shown in FIG. 4, the inner surface shape of the two semi-cylindrical resin magnet members 20, 30, that is, a hollow portion formed inside the roller when the two semi-cylindrical resin magnet members 20, 30 are fitted together. Each of the surface shapes on the side is formed in a semicircular shape. On the other hand, the thickness of one semi-cylindrical resin magnet member 20 and the thickness of the other semi-cylindrical resin magnet member 30 are different from each other in at least one place of the cross section. The dimension r from the inner surface of one semi-cylindrical resin magnet member 20 to the shaft center is different from the dimension r 'from the inner surface of the other semi-cylindrical resin magnet member 30 to the shaft center. That is, the magnet roller 10 is formed so that the hollow portion formed in the roller is divided into two by a straight line passing through the shaft center and the fitting surface, and the respective areas or volumes are different. Thereby, it is comprised so that the thickness of the two semi-cylinder-shaped resin magnet members 20 and 30 may differ in the said cross section. Further, the magnet roller 10 shown in FIG. 4 is configured so that the thicknesses of the two semi-cylindrical resin magnet members 20 and 30 are different from each other, thereby fitting the two semi-cylindrical resin magnet members 20 and 30 together. A step is provided inside the mating surface.
 また、図5(a)に示すマグネットローラ10は、上記図4に示すマグネットローラ10の構成に加え、更に他方の半筒状樹脂磁石部材30の内面形状を、半円状に形成された一方の半筒状樹脂磁石部材20の内面形状とは異なる異形に形成している。これにより、2つの半筒状樹脂磁石部材20,30が、上記断面において互いに異なる断面形状になるよう構成されている。 Further, in the magnet roller 10 shown in FIG. 5A, in addition to the configuration of the magnet roller 10 shown in FIG. 4, the inner shape of the other semi-cylindrical resin magnet member 30 is formed in a semicircular shape. The semi-cylindrical resin magnet member 20 is formed in a different shape from the inner surface shape. Thereby, the two semi-cylinder-shaped resin magnet members 20 and 30 are comprised so that it may become mutually different cross-sectional shape in the said cross section.
  図8,9に示される、シャフト51にマグネットピース52を貼り付けて構成される従来のマグネットローラ50では、内側からマグネットピースの形状や厚み等を変更するのは困難であるが、本発明のマグネットローラ10は、2つの部材の嵌合により中空部を有する構造からなる。そのため、例えば図4、図5(a)に示すマグネットローラ10のように、ローラ外周面の形状等を変更せずに円柱状の外観を保ったまま、所望の磁力パターンを形成するための因子を新たに加えることができ、これにより複雑な磁力パターンの形成に対応できる。なお、本発明において上記断面形状等は、軸方向に鉛直な切断面における断面形状をいう。 8 and 9, it is difficult to change the shape and thickness of the magnet piece from the inside in the conventional magnet roller 50 configured by attaching the magnet piece 52 to the shaft 51. The magnet roller 10 has a structure having a hollow portion by fitting two members. Therefore, for example, as in the case of the magnet roller 10 shown in FIGS. 4 and 5A, a factor for forming a desired magnetic pattern while maintaining a cylindrical appearance without changing the shape or the like of the outer peripheral surface of the roller. Thus, it is possible to cope with the formation of a complicated magnetic force pattern. In the present invention, the cross-sectional shape and the like refer to a cross-sectional shape in a cut surface perpendicular to the axial direction.
 図5(c),図5(g),図5(i)に示すマグネットローラ10は、上記断面において一方の半筒状樹脂磁石部材20及び/又は他方の半筒状樹脂磁石部材30の外周面に、1又は2以上の平坦部が形成されている。また、図5(b),図5(g),図5(h),図5(i)に示すマグネットローラ10は、上記断面において一方の半筒状樹脂磁石部材20及び/又は他方の半筒状樹脂磁石部材30の外周面に、1又は2以上の凸部又は凹部が形成されている。また、図5(e),図5(h)に示すマグネットローラ10は、上記断面において一方の半筒状樹脂磁石部材20及び/又は他方の半筒状樹脂磁石部材30の外周面に、1又は2以上の切欠きが形成されている。これらのマグネットローラ10は、半筒状樹脂磁石部材20,30の外周面に、平坦部、凹部、切欠き又は凸部が設けられることで、上記図4に示すマグネットローラ10の構成に加え、一方の半筒状樹脂磁石部材20の外面形状及び外面から軸心までの寸法Rと、上記他方の半筒状樹脂磁石部材30の外面形状及び外面から軸心までの寸法R’が互いに異なるように構成される。これにより、所望の磁力パターンを形成するための新たな因子として上記断面形状等を加えることができる。更に、外面形状、外面から軸心までの寸法が異なるように構成されるため、これらのマグネットローラ10には、アルミスリーブとの距離も、所望の磁力パターンを形成するための新たな因子として加えることができ、より複雑な磁力パターンの形成に対応できる。なお、図5(i)に示すマグネットローラ10は、2つの半筒状樹脂磁石部材20,30の嵌合面の外側に段差が設けられている。また、図5(b),図5(e),図5(g),図5(h),図5(i)に示すマグネットローラ10のように、樹脂磁石部材の外周面に凹部又は切欠きを形成すれば、上記の効果に加え、更に磁気特性の違う磁性部材を磁力調整材としてはめ込むこともできる。 5 (c), 5 (g), and 5 (i), the outer periphery of one semi-cylindrical resin magnet member 20 and / or the other semi-cylindrical resin magnet member 30 in the cross-section described above. One or two or more flat portions are formed on the surface. 5 (b), 5 (g), 5 (h), and 5 (i), the magnet roller 10 has one semi-cylindrical resin magnet member 20 and / or the other half in the cross section. One or more convex portions or concave portions are formed on the outer peripheral surface of the cylindrical resin magnet member 30. Further, the magnet roller 10 shown in FIGS. 5 (e) and 5 (h) is provided on the outer peripheral surface of one semi-cylindrical resin magnet member 20 and / or the other semi-cylindrical resin magnet member 30 in the cross section. Or two or more notches are formed. These magnet rollers 10 are provided with a flat portion, a concave portion, a notch or a convex portion on the outer peripheral surface of the semi-cylindrical resin magnet members 20 and 30, in addition to the configuration of the magnet roller 10 shown in FIG. The outer surface shape of one semi-cylindrical resin magnet member 20 and the dimension R from the outer surface to the axial center are different from the outer surface shape of the other semi-cylindrical resin magnet member 30 and the dimension R ′ from the outer surface to the axial center. Configured. Thereby, the said cross-sectional shape etc. can be added as a new factor for forming a desired magnetic force pattern. Furthermore, since the outer surface shape and the dimension from the outer surface to the axial center are different, the distance from the aluminum sleeve is also added to these magnet rollers 10 as a new factor for forming a desired magnetic force pattern. It is possible to cope with the formation of a more complicated magnetic pattern. Note that the magnet roller 10 shown in FIG. 5 (i) is provided with a step on the outside of the fitting surface of the two semi-cylindrical resin magnet members 20 and 30. Further, as in the magnet roller 10 shown in FIGS. 5B, 5E, 5G, 5H, and 5I, a recess or a cut is formed on the outer peripheral surface of the resin magnet member. If a notch is formed, in addition to the above effects, a magnetic member having a different magnetic characteristic can be fitted as a magnetic force adjusting material.
 また、図5(d),図5(f)に示すマグネットローラ10は、他方の半筒状樹脂磁石部材30の外周面に設けられた平坦部又は凹部に対応するように、樹脂磁石部材の内面にも平坦部又は凹部が設けられている。即ち、上記図5(c)等に示すマグネットローラ10の構成に加え、更に、図5(a)のように、2つの樹脂磁石部材における内面形状も異なるように構成され、これによって、より複雑な磁力パターンの形成に対応できる。 Further, the magnet roller 10 shown in FIGS. 5 (d) and 5 (f) is formed of a resin magnet member so as to correspond to a flat portion or a recess provided on the outer peripheral surface of the other semi-cylindrical resin magnet member 30. A flat portion or a concave portion is also provided on the inner surface. That is, in addition to the configuration of the magnet roller 10 shown in FIG. 5C and the like, the inner shape of the two resin magnet members is also different as shown in FIG. It can cope with formation of a simple magnetic pattern.
 以上、本発明のマグネットローラでは、パーツ数が極めて少なく、組み立てが容易であって、しかも容易に、かつ低コストで複雑な磁力パターンの形成に対応することができる。 As described above, the magnet roller according to the present invention has an extremely small number of parts, is easy to assemble, and can easily form a complicated magnetic pattern at a low cost.
 本発明のマグネットローラは、トナーを使用して画像を形成するプリンタ、複写機、ファクシミリ等の画像形成装置において、現像装置やクリーニング装置に利用することができる。 The magnet roller of the present invention can be used for a developing device and a cleaning device in an image forming apparatus such as a printer, a copying machine, and a facsimile machine that forms an image using toner.
 10:マグネットローラ
 20, 30:半円筒状樹脂磁石部材
 21,31:環状部
 22,32:軸部
10: magnet roller 20, 30: semi-cylindrical resin magnet member 21, 31: annular portion 22, 32: shaft portion

Claims (9)

  1.  一方の端部に環状部をそれぞれ有し、他方の端部に軸部をそれぞれ有する2つの半筒状樹脂磁石部材を備え、一方の前記半筒状樹脂磁石部材の前記軸部を、他方の前記半筒状樹脂磁石部材の前記環状部に挿入して嵌合することによって、両端部のそれぞれに前記軸部を有する筒状ローラが形成されるマグネットローラであって、
     前記マグネットローラの両端部を除いた部分の断面において前記一方の半筒状樹脂磁石部材の断面形状と前記他方の半筒状樹脂磁石部材の断面形状が互いに異なるか及び/又は前記断面の少なくとも一箇所において前記一方の半筒状樹脂磁石部材の厚みと前記他方の半筒状樹脂磁石部材の厚みが互いに異なることを特徴とするマグネットローラ。
    Two semi-cylindrical resin magnet members each having an annular portion at one end and a shaft portion at the other end are provided, and the shaft portion of one of the semi-cylindrical resin magnet members is connected to the other end A magnet roller in which a cylindrical roller having the shaft portion is formed at each of both end portions by being inserted into and fitted into the annular portion of the semi-cylindrical resin magnet member,
    The cross-sectional shape of the one semi-cylindrical resin magnet member and the cross-sectional shape of the other semi-cylindrical resin magnet member are different from each other and / or at least one of the cross-sections in the cross section of the portion excluding both ends of the magnet roller The magnet roller according to claim 1, wherein the thickness of the one semi-cylindrical resin magnet member and the thickness of the other semi-cylindrical resin magnet member are different from each other.
  2.  前記断面において前記一方の半筒状樹脂磁石部材の内面形状と前記他方の半筒状樹脂磁石部材の内面形状が互いに異なるか及び/又は前記断面の少なくとも一箇所において前記一方の半筒状樹脂磁石部材の内面から軸心までの寸法と前記他方の半筒状樹脂磁石部材の内面から軸心までの寸法が互いに異なる請求項1記載のマグネットローラ。 In the cross section, the inner surface shape of the one semi-cylindrical resin magnet member and the inner surface shape of the other semi-cylindrical resin magnet member are different from each other and / or the one semi-cylindrical resin magnet in at least one position of the cross section. The magnet roller according to claim 1, wherein a dimension from the inner surface of the member to the shaft center and a dimension from the inner surface to the shaft center of the other semi-cylindrical resin magnet member are different from each other.
  3.  前記断面において前記一方の半筒状樹脂磁石部材の外面形状と前記他方の半筒状樹脂磁石部材の外面形状が互いに異なるか及び/又は前記断面の少なくとも一箇所において前記一方の半筒状樹脂磁石部材の外面から軸心までの寸法と前記他方の半筒状樹脂磁石部材の外面から軸心までの寸法が互いに異なる請求項1記載のマグネットローラ。 In the cross section, the outer surface shape of the one semi-cylindrical resin magnet member and the outer surface shape of the other semi-cylindrical resin magnet member are different from each other and / or the one semi-cylindrical resin magnet in at least one place of the cross section. The magnet roller according to claim 1, wherein a dimension from the outer surface of the member to the shaft center and a dimension from the outer surface to the shaft center of the other semi-cylindrical resin magnet member are different from each other.
  4.  前記断面において少なくとも前記一方の半筒状樹脂磁石部材の断面形状が半円筒でない異形を有する請求項1記載のマグネットローラ。 2. The magnet roller according to claim 1, wherein at least one of the semi-cylindrical resin magnet members has a non-half-cylindrical cross-sectional shape in the cross-section.
  5.  前記断面において前記一方の半筒状樹脂磁石部材と前記他方の半筒状樹脂磁石部材との内側又は外側の嵌合面に段差を有する請求項1記載のマグネットローラ。 The magnet roller according to claim 1, wherein a step is formed on an inner or outer fitting surface between the one semi-cylindrical resin magnet member and the other semi-cylindrical resin magnet member in the cross section.
  6.  前記断面において前記一方の半筒状樹脂磁石部材の厚み及び/又は前記他方の部材の厚みが均一である請求項1記載のマグネットローラ。 The magnet roller according to claim 1, wherein the thickness of the one semi-cylindrical resin magnet member and / or the thickness of the other member is uniform in the cross section.
  7.  前記断面において前記一方の半筒状樹脂磁石部材及び/又は前記他方の半筒状樹脂磁石部材の外周面に、1又は2以上の平坦部が形成された請求項1記載のマグネットローラ。 The magnet roller according to claim 1, wherein one or two or more flat portions are formed on an outer peripheral surface of the one semi-cylindrical resin magnet member and / or the other semi-cylindrical resin magnet member in the cross section.
  8.  前記断面において前記一方の半筒状樹脂磁石部材及び/又は前記他方の半筒状樹脂磁石部材の外周面に、1又は2以上の凸部又は凹部が形成された請求項1記載のマグネットローラ。 2. The magnet roller according to claim 1, wherein one or more convex portions or concave portions are formed on an outer peripheral surface of the one semi-cylindrical resin magnet member and / or the other semi-cylindrical resin magnet member in the cross section.
  9.  前記断面において前記一方の半筒状樹脂磁石部材及び/又は前記他方の半筒状樹脂磁石部材の外周面に、1又は2以上の切欠きが形成された請求項1記載のマグネットローラ。 2. The magnet roller according to claim 1, wherein one or two or more notches are formed on an outer peripheral surface of the one semi-cylindrical resin magnet member and / or the other semi-cylindrical resin magnet member in the cross section.
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