JP2005109414A - Mold for use in injection molding magnet roller - Google Patents

Mold for use in injection molding magnet roller Download PDF

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JP2005109414A
JP2005109414A JP2003344507A JP2003344507A JP2005109414A JP 2005109414 A JP2005109414 A JP 2005109414A JP 2003344507 A JP2003344507 A JP 2003344507A JP 2003344507 A JP2003344507 A JP 2003344507A JP 2005109414 A JP2005109414 A JP 2005109414A
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magnet
sector
magnetic
mold
fan
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Yoshihiko Mukoyama
慶彦 向山
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for use in injection molding a magnet roller which is low in cost, does not lengthen a trial term and a time for delivery, and molds magnet rollers of various magnetic force patterns. <P>SOLUTION: The mold for use in injection molding magnet rollers, which produces a magnetic field in a cavity formed by cylindrical components 22, includes a non-magnetic cylindrical component 22 having an inside circumference surface corresponding to an outside circumference surface of a column magnet roller and a plurality of sector magnets separately located in a circumferential direction each other. Each of sector magnet portions 3 is composed of a predetermined sector element magnet 24 and at least one sector element magnet 24, 39 selected from the group of sector element magnets 39 whose sector angle is the integer-multiplied sector angle of the fundamental sector element magnet 39 so that those magnet are located in a circumferential direction, and at least one sector magnet portion 23 is composed of sector element magnets 24, 39 of ≥2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、複写機、ファクシミリ、プリンタ等の電子写真プロセスで、感光ドラム等の潜像保持体に現像剤を供給して該潜像保持体上の静電潜像を現像する現像機構部に好適に使用されるマグネットローラを、射出成型により成型する際に用いられる金型に関する。   The present invention provides a developing mechanism for supplying a developer to a latent image holding body such as a photosensitive drum and developing an electrostatic latent image on the latent image holding body in an electrophotographic process such as a copying machine, a facsimile machine, or a printer. The present invention relates to a mold used when a suitably used magnet roller is molded by injection molding.

従来から、複写機、プリンタ等の電子写真装置や静電記録装置などにおいて、感光ドラム等の潜像保持体上の静電潜像を可視化する現像ローラとして、回転するスリーブ内にボンド磁石により成形されたマグネットローラを配設し、スリーブ表面に担持した磁性現像剤（トナー）を該マグネットローラの磁力特性により潜像保持体上に飛翔させる所謂ジャンピング現象によって、潜像保持体表面にトナーを供給し、静電潜像を可視化する現像方法が知られており、このマグネットローラは、主にナイロンやポリプロピレン等の熱可塑性樹脂のバインダーにフェライト等の磁性粉体を混合した樹脂磁石組成物を射出成型することにより製造されている。   Conventionally, in electrophotographic devices such as copiers and printers and electrostatic recording devices, as a developing roller that visualizes the electrostatic latent image on a latent image carrier such as a photosensitive drum, it is molded with a bonded magnet in a rotating sleeve. The toner is supplied to the surface of the latent image holding member by a so-called jumping phenomenon in which a magnetic developer (toner) carried on the sleeve surface is disposed on the surface of the sleeve by the magnetic property of the magnet roller. However, a developing method for visualizing an electrostatic latent image is known. This magnet roller mainly ejects a resin magnet composition in which a magnetic powder such as ferrite is mixed with a binder of a thermoplastic resin such as nylon or polypropylene. Manufactured by molding.

このような樹脂磁石組成物を成型するのに用いられる金型として、図７に示すような極配置タイプのものが知られており、（例えば、特許文献１参照。）この金型５０は、キャビティを囲繞する非磁性体の部材５１に、キャビティ５５の周方向に角度γ１、γ２、γ３、γ４の間隔をもって設けたスリット５２に、着磁極となる磁石部分Ｐ１、Ｐ２、Ｐ３、Ｐ４をそれぞれ配設している。この金型５０のキャビティ５５に樹脂磁石組成物を射出注入して、着磁極により樹脂磁石組成物中に分散混合された磁性粉体の配向または着磁を行って、マグネットローラを成型する。   As a mold used to mold such a resin magnet composition, a pole arrangement type as shown in FIG. 7 is known (for example, see Patent Document 1). Magnet portions P1, P2, P3, and P4 serving as magnetic poles are respectively formed in slits 52 provided at intervals of angles γ1, γ2, γ3, and γ4 in the circumferential direction of the cavity 55 in the nonmagnetic member 51 that surrounds the cavity. It is arranged. The magnet magnet is molded by injecting and injecting the resin magnet composition into the cavity 55 of the mold 50 and orienting or magnetizing the magnetic powder dispersed and mixed in the resin magnet composition by the magnetic pole.

しかしながら、電子写真装置の多様化に伴って、マグネットロール自体の多品種化も進み、種々の磁力パターンを有するマグネットロールが要求される昨今の情勢において、上述したような金型５０では、磁力パターンの異なるマグネットロールごとに、着磁極の配置位置つまり角度γ１〜γ４を変えなければならないことに加えて、磁力の強さつまり磁石部分Ｐ１〜Ｐ４の幅を変える必要があるため、幅の異なる磁石部分Ｐ１〜Ｐ４を逐一製造する必要があり、製造コストがかさみ納期が長期化するといういう問題点があった。さらに最終仕様に至るまでに何度となく試作するための試作金型についても同様にしてコストがかさみ、試作期間が長くなるという問題点もあった。   However, with the diversification of electrophotographic apparatuses, a variety of magnet rolls have been developed, and in the current situation where magnet rolls having various magnetic patterns are required, in the mold 50 as described above, the magnetic pattern In addition to having to change the arrangement position of the magnetic poles, that is, the angles γ1 to γ4, for each of the different magnet rolls, it is necessary to change the strength of the magnetic force, that is, the width of the magnet portions P1 to P4. There is a problem that it is necessary to manufacture the parts P1 to P4 one by one, which increases the manufacturing cost and prolongs the delivery time. In addition, there is a problem in that the cost of the trial mold for trial production many times before reaching the final specification is also increased, and the trial production period becomes longer.

また、樹脂磁石組成物を成型するのに用いられる金型の別の形態として、図８に示すようないわゆる反発磁界タイプと言われるものが知られており（例えば、特許文献２参照。）、この金型６０は、周方向の角度幅がそれぞれδ１、δ２、δ３、δ４の、四つの磁石部分６１、６２、６３、６４と、鉄などの軟質磁性体から成るクサビ形状の四つの着磁極６５とを周方向に交互に配列して、それらの内周側にキャビティ６８を形成する円筒部材６６を設け、それらの外周側に非磁性体からなる外円筒体６７を設けてなり、隣接する磁石部分６１〜６４の磁極の向きはキャビティ６８の周方向であり、かつ相互に逆向きとしている。このような反発磁界タイプの金型６０においても、磁極配置の異なる多品種のマグネットロールを製造するにあたっては、磁石部分６１〜６４をその都度製作する必要があり、製造コストがかさみ納期も長期化するという問題点があり、また、試作金型のコストや試作期間がかさむという問題点もあった。
特開２００３−４５７３４号公報 特開平６−１９０８５５号公報 Moreover, what is called a repulsive magnetic field type as shown in FIG. 8 is known as another form of the mold used for molding the resin magnet composition (see, for example, Patent Document 2). The mold 60 includes four magnet portions 61, 62, 63, 64 having a circumferential angular width of δ1, δ2, δ3, and δ4, and four wedge-shaped magnetic poles made of a soft magnetic material such as iron. 65 are alternately arranged in the circumferential direction, cylindrical members 66 forming cavities 68 are provided on the inner peripheral side thereof, and outer cylindrical bodies 67 made of a nonmagnetic material are provided on the outer peripheral side thereof, and adjacent to each other. The directions of the magnetic poles of the magnet portions 61 to 64 are the circumferential direction of the cavity 68 and are opposite to each other. Even in such a repulsive magnetic field type mold 60, when manufacturing various types of magnet rolls having different magnetic pole arrangements, it is necessary to manufacture the magnet portions 61 to 64 each time, which increases the manufacturing cost and extends the delivery time. In addition, there is a problem that the cost of the trial mold and the trial period are increased.
JP 2003-45734 A JP-A-6-190855

本発明は、従来技術が抱えるこのような問題を解決することを課題としてなされたものであり、それの目的は、低コストで、試作期間や納期を長期化させたりすることのない、異なる磁力パターンを有するマグネットロールを成型する金型を提供することにある。   The present invention has been made to solve such problems of the prior art, and the purpose of the present invention is to reduce the magnetic force at a low cost and without prolonging the trial production period and delivery time. It is providing the metal mold | die which shape | molds the magnet roll which has a pattern.

請求項１に係る発明は、円筒状のマグネットローラの外周面に対応する内周面を有する非磁性の円筒部材と、この円筒部材の半径方向外側に設けられ、周方向に互いに離隔して配設された複数の扇形磁石部分とを具え、前記円筒部材により形成されるキャビティ内に磁場を形成するマグネットローラ射出成型用金型において、それぞれの扇形磁石部分を、所定形状の基本扇形要素磁石、および、この基本扇形要素磁石の扇角を整数倍した倍角扇形要素磁石よりなる群より選ばれた少なくとも一枚の扇形要素磁石を一枚以上周方向に配置して構成し、少なくとも一の扇形磁石部分を、二枚以上の扇形要素磁石で構成してなるマグネットローラ射出成型用金型である。
ここで扇形要素磁石は、前述の基本扇形要素磁石および倍角扇形要素磁石を総称するものとする。 The invention according to claim 1 is a non-magnetic cylindrical member having an inner peripheral surface corresponding to the outer peripheral surface of the cylindrical magnet roller, and is provided on the radially outer side of the cylindrical member and spaced apart from each other in the circumferential direction. In a magnet roller injection mold that includes a plurality of sector magnet portions provided and forms a magnetic field in a cavity formed by the cylindrical member, each sector magnet portion is a basic sector element magnet having a predetermined shape, And at least one sector magnet, wherein at least one sector element magnet selected from the group consisting of double angle sector element magnets obtained by multiplying the sector angle of the basic sector element magnet by an integer is arranged in the circumferential direction. This is a magnet roller injection mold in which the portion is composed of two or more fan-shaped element magnets.
Here, the sector element magnet is a generic term for the basic sector element magnet and the double-angle sector element magnet described above.

請求項２に係る発明は、請求項１に記載の発明において、前記扇形磁石部分の磁極の方向を半径方向とし、隣り合う扇形磁石部分の間に形成される扇形の部分を非磁性ブロックで構成し、非磁性ブロックを、所定形状の基本扇形要素非磁性体、および、この基本扇形要素非磁性体の扇角を整数倍した倍角扇形要素非磁性体よりなる群より選ばれた少なくとも一枚の扇形要素非磁性体を一枚以上周方向に配置して構成してなる。
ここで扇形要素非磁性体は、前述の基本扇形要素非磁性体および倍角扇形要素非磁性体を総称するものとするマグネットローラ射出成型用金型である。 The invention according to claim 2 is the invention according to claim 1, wherein the direction of the magnetic pole of the sector magnet portion is a radial direction, and the sector portion formed between adjacent sector magnet portions is configured by a nonmagnetic block. The non-magnetic block is at least one selected from the group consisting of a basic sector element non-magnetic body having a predetermined shape and a double-angle sector element non-magnetic body that is an integral multiple of the fan angle of the basic sector element non-magnetic body. One or more fan-shaped element nonmagnetic materials are arranged in the circumferential direction.
Here, the fan-shaped element nonmagnetic material is a magnet roller injection mold that collectively refers to the aforementioned basic fan-shaped element nonmagnetic material and double-angle fan-shaped element nonmagnetic material.

請求項３に係る発明は、請求項２に記載の発明において、扇形要素磁石の種類を、磁極の向きが相互に逆となる二種類としてなるマグネットローラ射出成型用金型である。   The invention according to claim 3 is the magnet roller injection mold according to the invention of claim 2, wherein the types of the sector element magnets are two types in which the directions of the magnetic poles are opposite to each other.

請求項４に係る発明は、請求項１に記載の発明において、前記扇形磁石部分の磁極の方向を周方向とし、隣り合う扇形磁石部分の間に形成される扇形の部分を軟質磁性体を含んで構成し、基本扇形要素磁石の種類を一種類としてなるマグネットローラ射出成型用金型である。   According to a fourth aspect of the present invention, in the first aspect of the invention, the direction of the magnetic pole of the sector magnet portion is a circumferential direction, and the sector portion formed between adjacent sector magnet portions includes a soft magnetic material. This is a magnet roller injection molding die that is composed of a single type of basic sector element magnet.

請求項１に係る発明によれば、極配置タイプの金型において、成型するマグネットロールの個別の磁力パターンに応じて、扇形磁石部分の磁力強さを、それぞれ予め決められた形状の扇形要素磁石の配列を変えるだけで変化させることができ、このことにより、個別に扇形磁石部分を逐一製作することに較べて、製造コストを削減し、納期を短縮することができる。   According to the first aspect of the present invention, in the pole arrangement type mold, the magnetic strength of the sector magnet portion is determined in accordance with the individual magnetic pattern of the magnet roll to be molded. Therefore, the manufacturing cost can be reduced and the delivery time can be shortened as compared with the case where the individual fan magnet portions are individually manufactured one by one.

また、反発磁界タイプの金型においては、成型するマグネットロールの磁力パターンに応じて、磁極を形成する扇形部分の周方向位置を、変化させる必要があるが、請求項１に係る発明によれば、この周方向位置を特定する扇形磁石部分の配置と扇角とを、扇形要素磁石の配列を変えるだけで変化させることができ、このことにより、個別に扇形磁石部分を逐一製作することに較べて、製造コストを削減し、納期を短縮することができる。   Further, in the repulsive magnetic field type mold, it is necessary to change the circumferential position of the fan-shaped portion forming the magnetic pole according to the magnetic force pattern of the magnet roll to be molded. The position and angle of the fan-shaped magnet portions that specify the circumferential position can be changed simply by changing the arrangement of the fan-shaped element magnets. This makes it possible to produce individual fan-shaped magnet portions one by one. Thus, manufacturing costs can be reduced and delivery times can be shortened.

さらに、極配置タイプの金型において、成型するマグネットロールの磁力パターンに応じて扇形磁石部分の個数、配置を変える場合には、扇形磁石部分同士の間に位置してこれらの配置を特定する非磁性ブロックの周方向幅を変化させる必要があるが、請求項２に係る発明によれば、非磁性ブロックの周方向幅を、扇形要素非磁性体の配列を変えるだけで変化させることができ、このことにより、個別に非磁性ブロックを製作することに較べて、製造コストを削減し、納期を短縮することができる。   Furthermore, in the pole arrangement type mold, when changing the number and arrangement of the fan-shaped magnet parts according to the magnetic force pattern of the magnet roll to be molded, it is located between the fan-shaped magnet parts to identify the arrangement. Although it is necessary to change the circumferential width of the magnetic block, according to the invention according to claim 2, the circumferential width of the nonmagnetic block can be changed only by changing the arrangement of the sector element nonmagnetic bodies, As a result, the manufacturing cost can be reduced and the delivery time can be shortened as compared with the case where the nonmagnetic blocks are individually manufactured.

請求項３に係る発明によれば、極配置タイプの金型において、基本扇形要素磁石の種類を最少の二種類としたので、基本扇形要素磁石を製作し準備するためのコストをさらに抑制することができる。   According to the invention of claim 3, in the pole arrangement type mold, since the number of basic sector element magnets is minimized, the cost for manufacturing and preparing the basic sector element magnet is further suppressed. Can do.

反発磁界タイプの金型においては、基本扇形要素磁石の磁極は周方向に向き、またその形状は扇形の対称形であるため、基本扇形要素磁石を裏返して使用することにより、磁極の向きを時計方向と反時計方向とで入れ替えることができる。請求項４に係る発明によれば、基本扇形要素磁石の種類を最少の一種類としたので、基本扇形要素磁石を製作準備するコストを最小化して、金型の製造コストをさらに削減することができる。   In the repulsive magnetic field type mold, the magnetic poles of the basic sector element magnets are oriented in the circumferential direction, and the shape of the magnetic poles is symmetrical, so the direction of the magnetic poles can be adjusted by turning the basic sector element magnets upside down. The direction and the counterclockwise direction can be switched. According to the invention of claim 4, since the type of the basic sector element magnet is the smallest, the cost for preparing the basic sector element magnet can be minimized, and the manufacturing cost of the mold can be further reduced. it can.

以下に、本発明の実施の形態を、図面に示すところに基づいて説明する。図１は、本発明の実施の形態を示す、マグネットローラの成型用の金型の概略断面図である。
この金型１は、円筒部材２の半径方向外側に、永久磁石で構成された複数の扇形磁石部分３Ａ１、３Ａ２、３Ａ３、３Ａ４を、周方向に、それぞれの扇形磁石部分の中心線のなす角度を、例えば、α１＝７１．２５度、α２＝９３．７５度、α３＝１０１．２５度、α４＝９３．７５度として配列し、それぞれの扇形磁石部分３の間に、非磁性体よりなる、扇形の非磁性ブロック６Ａ１、６Ａ２、６Ａ３、６Ａ４を配設し、その半径方向外側には軟質磁性体からなる外円筒体８を配設して構成される。
ここで、それぞれの扇形磁石部分３Ａ１〜３Ａ４を、扇形磁石部分３Ａ１〜３Ａ４の周方向幅に応じた数の基本扇形要素磁石４、５を周方向に配列して構成するとともに、それぞれの非磁性ブロック６Ａ１〜６Ａ４を、基本扇形要素非磁性体７をそれぞれの扇形磁石部分３Ａ１〜３Ａ４の中心線のなす角度α１〜α４に応じた数だけ組み合わせて構成する。ここで、基本扇形要素磁石４、５および基本扇形要素非磁性体７はすべて同じ形状とし、また、扇形要素磁石４、５は磁極の方向を半径方向とし、扇形要素磁石４は、内周側をＮ極、扇形要素磁石５は、内周側をＳ極とする。
外円筒体８の内周面には、一又は複数の凸部９を設けるとともに、それらに対応する凹部１０をそれぞれの扇形要素非磁性体７の外周側に設け、凸部９と凹部１０を掛合させることにより、外円筒体８に対して、扇形要素磁石４、５および扇形要素非磁性体７が周方向に回転するのを防止する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view of a magnet roller molding die showing an embodiment of the present invention.
The mold 1 includes a plurality of sector magnet portions 3A1, 3A2, 3A3, and 3A4 made of permanent magnets on the outer side in the radial direction of the cylindrical member 2, and an angle formed by the center line of each sector magnet portion in the circumferential direction. Are arranged as, for example, α1 = 71.25 degrees, α2 = 93.75 degrees, α3 = 101.25 degrees, α4 = 93.75 degrees, and are made of a non-magnetic material between the respective sector magnet portions 3. The fan-shaped non-magnetic blocks 6A1, 6A2, 6A3, 6A4 are arranged, and an outer cylindrical body 8 made of a soft magnetic material is arranged on the outer side in the radial direction.
Here, each of the sector magnet portions 3A1 to 3A4 is configured by arranging the number of basic sector element magnets 4 and 5 in the circumferential direction according to the circumferential width of the sector magnet portions 3A1 to 3A4, and each nonmagnetic The blocks 6A1 to 6A4 are configured by combining the basic sector element nonmagnetic bodies 7 in a number corresponding to the angles α1 to α4 formed by the center lines of the respective sector magnet portions 3A1 to 3A4. Here, the basic sector element magnets 4 and 5 and the basic sector element nonmagnetic body 7 all have the same shape, the sector element magnets 4 and 5 have a magnetic pole direction in the radial direction, and the sector element magnet 4 has an inner peripheral side. Is an N pole, and the sector element magnet 5 has an inner peripheral side as an S pole.
One or a plurality of convex portions 9 are provided on the inner peripheral surface of the outer cylindrical body 8, and corresponding concave portions 10 are provided on the outer peripheral side of each sector element nonmagnetic body 7, and the convex portions 9 and the concave portions 10 are provided. By engaging, the sector element magnets 4 and 5 and the sector element nonmagnetic body 7 are prevented from rotating in the circumferential direction with respect to the outer cylindrical body 8.

図２は、図１に示した金型１で成型するマグネットローラとは異なる磁力パターンのマグネットローラを成型するための金型１１を示すものであり、金型１１は、金型１における扇形磁石部分３Ａ１〜３Ａ４および非磁性ブロック６Ａ１〜６Ａ４の代わりに、扇形磁石部分３Ａ１〜３Ａ４とは異なる幅の四つの扇形磁石部分３Ｂ１、３Ｂ２、３Ｂ３、３Ｂ４を、それぞれの中心線のなす角度α１〜α４がα１＝α２＝α３＝α４＝９０度となるよう配置し、それぞれの扇形磁石部分３Ｂ１〜３Ｂ４の間に非磁性ブロック６Ｂ１、６Ｂ２、６Ｂ３、６Ｂ４を配置して構成される。
ここで、それぞれの扇形磁石部分３Ｂ１〜３Ｂ４は、扇形磁石部分３Ｂ１〜３Ｂ４の周方向幅に応じた数の基本扇形要素磁石４、５を周方向に配列して構成するとともに、それぞれの非磁性ブロック６Ｂ１〜６Ｂ４を、基本扇形要素非磁性体７をそれぞれの扇形磁石部分３Ａ１〜３Ａ４の中心線のなす角度α１〜α４に応じた数だけ配列して構成する。
このように、異なる磁力パターンを有するマグネットロールを成型するためのそれぞれの金型１、１１の扇形磁石部分および非磁性ブロックを、それぞれ、同一形状の基本扇形要素磁石４、５および基本扇形要素非磁性体７の配列を異ならせるだけで構成することができ、扇形磁石部分や非磁性ブロックを逐一製造することに較べて、製造コストを削減することができる。なお、円筒部材２や外円筒体８も共通の仕様で構成することはもちろんである。 FIG. 2 shows a mold 11 for molding a magnet roller having a different magnetic force pattern from the magnet roller molded by the mold 1 shown in FIG. 1, and the mold 11 is a sector magnet in the mold 1. Instead of the portions 3A1 to 3A4 and the nonmagnetic blocks 6A1 to 6A4, the angles α1 to α4 formed by the respective center lines of the four sector magnet portions 3B1, 3B2, 3B3, and 3B4 having a width different from that of the sector magnet portions 3A1 to 3A4. Are arranged such that α1 = α2 = α3 = α4 = 90 degrees, and non-magnetic blocks 6B1, 6B2, 6B3, 6B4 are arranged between the respective sector magnet portions 3B1 to 3B4.
Here, each of the sector magnet portions 3B1 to 3B4 is configured by arranging the number of basic sector element magnets 4 and 5 in the circumferential direction according to the circumferential width of the sector magnet portions 3B1 to 3B4, and each non-magnetic portion. The blocks 6B1 to 6B4 are configured by arranging the basic sector element nonmagnetic bodies 7 in a number corresponding to the angles α1 to α4 formed by the center lines of the respective sector magnet portions 3A1 to 3A4.
As described above, the fan-shaped magnet portions and the nonmagnetic blocks of the respective molds 1 and 11 for molding the magnet rolls having different magnetic force patterns are respectively set to the basic fan-shaped element magnets 4 and 5 and the basic fan-shaped element non-shaped of the same shape. It can be configured only by changing the arrangement of the magnetic bodies 7, and the manufacturing cost can be reduced as compared with manufacturing the sector magnet portion and the nonmagnetic block one by one. Needless to say, the cylindrical member 2 and the outer cylindrical body 8 are also configured with a common specification.

ここで、図３に示すように、図１に示した一部の基本扇形要素非磁性体７に換えて、整数倍ここでは５倍の扇角を有する倍角扇形要素非磁性体１２を用いて、それぞれの非磁性ブロック６Ａ１、６Ａ２、６Ａ３、６Ａ４を構成することも出来る。これによれば、基本扇形要素非磁性体７を逐一配列することに較べ、非磁性ブロック６Ａ１〜６Ａ４ひいては金型１の組み立てをより迅速なものとすることができる。ここでは倍角扇形要素非磁性体は１２、基本扇形要素非磁性体７に対して５倍の扇角を持つものとして、一種類としたが、これを二種類以上としてもよく、例えば、３倍の扇角を持つものと４倍の扇角を持つものとを組み合わせて使用してもよい。   Here, as shown in FIG. 3, instead of some of the basic sector element non-magnetic bodies 7 shown in FIG. 1, a double-angle sector element non-magnetic body 12 having an integral multiple, that is, a 5-fold sector angle is used. Each of the nonmagnetic blocks 6A1, 6A2, 6A3, 6A4 can also be configured. According to this, compared with arranging the basic sector element nonmagnetic bodies 7 one by one, the assembly of the nonmagnetic blocks 6A1 to 6A4 and the mold 1 can be made quicker. Here, the double-angle fan-shaped element non-magnetic material is 12, which has a fan angle five times that of the basic fan-shaped element non-magnetic material 7. However, two or more types may be used. Those having a fan angle of 4 and those having a fan angle of 4 times may be used in combination.

図４は、本発明の他の実施の形態を示す、マグネットローラの成型用の金型の概略断面図である。図中、矢印はＳ極からＮ極に向かって形成される磁力線の方向を示す。
この金型２１は、反発磁界タイプの金型であり、円筒部材２２の半径方向外方に、四つの扇形磁石部分２３Ａ１、２３Ａ２、２３Ａ３、２３Ａ４を互いに離隔して設け、それらの磁極を周方向に向けるとともに、隣り合う扇形磁石部分２３Ａ１〜２３Ａ４で磁極の向きを互いに逆向きにし、それぞれの扇形磁石部分２３Ａ１〜２３Ａ４の間に、クサビ状の軟質磁性体２５、２６を含む扇形部分２７、２８、２９を、それぞれの扇形部分の中心線同士のなす角度β１〜β４が、例えばほぼ９０度となるよう配置し、これらの半径方向外側に非磁性体からなる外円筒体３０を配設する。また、扇形部分２７、２８、２９の軟質磁性体２５、２６の周方向両側部は、図中矢印で示すような極性を有する永久磁石３１、３２、３３、３４、３５、３６を設ける。それぞれの磁極の周方向長さを変える場合には、軟質磁性体２６の半径方向内側端の周方向長さを変化させればよく、例えば、図において、軟質磁性体２６の周方向長さは、軟質磁性体２５のほぼ２倍としている。
ここで、扇形磁石部分２３Ａ１〜２３Ａ４は、周方向に磁極を有する同一形状の永久磁石よりなる複数の基本扇形要素磁石２４を配列して構成される。 FIG. 4 is a schematic sectional view of a magnet roller molding die showing another embodiment of the present invention. In the figure, the arrow indicates the direction of magnetic lines of force formed from the south pole toward the north pole.
The die 21 is a repulsive magnetic field type die, and four sector magnet portions 23A1, 23A2, 23A3, and 23A4 are provided apart from each other radially outside the cylindrical member 22, and their magnetic poles are arranged in the circumferential direction. And adjacent fan-shaped magnet portions 23A1 to 23A4, the directions of the magnetic poles are opposite to each other. , 29 are arranged so that the angles β1 to β4 formed by the center lines of the respective fan-shaped portions are, for example, approximately 90 degrees, and the outer cylindrical body 30 made of a nonmagnetic material is arranged on the outer side in the radial direction. In addition, permanent magnets 31, 32, 33, 34, 35, and 36 having polarities as indicated by arrows in the drawing are provided on both sides in the circumferential direction of the soft magnetic bodies 25 and 26 of the sector portions 27, 28, and 29. In order to change the circumferential length of each magnetic pole, the circumferential length of the radially inner end of the soft magnetic body 26 may be changed. For example, in the figure, the circumferential length of the soft magnetic body 26 is The soft magnetic body 25 is almost twice as large.
Here, the sector magnet portions 23A1 to 23A4 are configured by arranging a plurality of basic sector element magnets 24 made of permanent magnets having the same shape and having magnetic poles in the circumferential direction.

基本扇形要素磁石２４は扇形で対称形状をしており、一種類のものを周方向に裏返して、磁極の向きの異なる扇形磁石部分２３Ａ１〜２３Ａ４に共通して使用することが出来る。また、外円筒体３０の少なくとも一箇所には、凸部３７を設け、基本扇形要素磁石２４にはその凸部３７に対する形状の凹部３８を設ける。これにより金型３２を組み立てるにあたり、この凸部３７と凹部３８を掛合させることにより、外円筒体３０に対して、基本扇形要素磁石２４および扇形部分２７、２８、２９が周方向に回転することを防ぐことができる。   The basic fan-shaped element magnet 24 is fan-shaped and symmetrical, and can be used in common for the fan-shaped magnet portions 23A1 to 23A4 having different magnetic pole orientations by flipping one type in the circumferential direction. Further, a convex portion 37 is provided in at least one place of the outer cylindrical body 30, and a concave portion 38 having a shape corresponding to the convex portion 37 is provided in the basic sector element magnet 24. Thus, when assembling the mold 32, the basic sector element magnet 24 and the sector portions 27, 28, and 29 rotate in the circumferential direction with respect to the outer cylindrical body 30 by engaging the projections 37 and the recesses 38. Can be prevented.

図５は、図４に示した金型２１で成型するマグネットローラとは異なる磁力パターンのマグネットローラを成型するための金型３９を示すものであり、金型３９は、金型２１における磁極を形成する扇形部分２７、２８、２９の配置を変えて構成したものであり、それぞれの中心線同士のなす角度は、β１＝１１６．２５度、β２＝８６．２５度、β３＝８２．５度、β４＝７５度である。そして、扇形磁石部分２３Ｂ１、２３Ｂ２、２３Ｂ３、２３Ｂ４を、扇形部分２７、２８、２９のそれぞれの間に配置するが、扇形磁石部分２３Ｂ１〜２３Ｂ４のそれぞれを、前記β１〜β４の角度に応じた個数の基本扇形要素磁石２４を周方向に配列させて構成する。   FIG. 5 shows a mold 39 for molding a magnet roller having a different magnetic force pattern from the magnet roller molded by the mold 21 shown in FIG. The arrangement of the fan-shaped portions 27, 28, 29 to be formed is changed, and the angles formed by the respective center lines are β1 = 116.25 degrees, β2 = 86.25 degrees, β3 = 82.5 degrees. , Β4 = 75 degrees. The fan-shaped magnet portions 23B1, 23B2, 23B3, and 23B4 are arranged between the fan-shaped portions 27, 28, and 29. The basic sector element magnets 24 are arranged in the circumferential direction.

このように、異なる磁力パターンを有するマグネットロールを成型するためのそれぞれの金型２１、３９の扇形磁石部分を、基本扇形要素磁石２４の数を異ならせて構成することができ、扇形磁石部分や非磁性ブロックを逐一製造することに較べて、製造コストを削減することができる。なお、円筒部材２２や外円筒体３０も共通の仕様で構成することはもちろんである。   As described above, the fan-shaped magnet portions of the molds 21 and 39 for molding the magnet rolls having different magnetic force patterns can be configured by changing the number of the basic fan-shaped element magnets 24. Manufacturing costs can be reduced compared to manufacturing nonmagnetic blocks one by one. It goes without saying that the cylindrical member 22 and the outer cylindrical body 30 are also configured with a common specification.

ここで、図６に示すように、図４の一部の基本扇形要素磁石２４に換えて、整数倍ここでは５倍の扇角を有する倍角扇形要素磁石４０を用いて、それぞれの扇形磁石部分２３Ａ１、２３Ａ２、２３Ａ３、２３Ａ４を構成することも出来る。これによれば、基本扇形要素磁石２４を逐一配列することに較べ、扇形磁石部分ひいては金型２１の組み立てをより迅速なものとすることができる。ここでは倍角扇形要素磁石４０は、基本扇形要素磁石２４に対して５倍の扇角を持つもの一種類としたが、これを二種類以上としてもよく、例えば、３倍の扇角を持つものと４倍の扇角を持つものとを組み合わせて使用してもよい。   Here, as shown in FIG. 6, instead of a part of the basic sector element magnets 24 in FIG. 4, a double-angle sector element magnet 40 having an integral multiple, here, a five-fold sector angle, is used. 23A1, 23A2, 23A3, and 23A4 can also be configured. According to this, as compared with arranging the basic sector element magnets 24 one by one, the assembly of the sector magnet part and the mold 21 can be made quicker. Here, the double-angle fan-shaped element magnet 40 is one type having a fan angle five times that of the basic fan-shaped element magnet 24. However, it may be two or more types, for example, having a fan angle three times as large. May be used in combination with those having a fan angle of 4 times.

本発明は、複写機やプリンタなどの電子写真装置に使用されるマグネットロールを成型する金型に関し、特に電子写真装置ごとに、異なる磁力パターンを有する多品種のマグネットロールを成型する金型に適用して効果的なものである。   The present invention relates to a mold for molding a magnet roll used in an electrophotographic apparatus such as a copying machine or a printer, and particularly to a mold for molding a variety of magnet rolls having different magnetic patterns for each electrophotographic apparatus. And effective.

本発明の一実施形態を示すマグネットロールを成型する金型の概略断面図である。It is a schematic sectional drawing of the metal mold | die which shape | molds the magnet roll which shows one Embodiment of this invention. 本発明の一実施形態を示すマグネットロールを成型する金型の概略断面図である。It is a schematic sectional drawing of the metal mold | die which shape | molds the magnet roll which shows one Embodiment of this invention. 本発明の一実施形態を示すマグネットロールを成型する金型の概略断面図である。It is a schematic sectional drawing of the metal mold | die which shape | molds the magnet roll which shows one Embodiment of this invention. 本発明の他の実施形態を示すマグネットロールを成型する金型の概略断面図である。It is a schematic sectional drawing of the metal mold | die which shape | molds the magnet roll which shows other embodiment of this invention. 本発明の他の実施形態を示すマグネットロールを成型する金型の概略断面図である。It is a schematic sectional drawing of the metal mold | die which shape | molds the magnet roll which shows other embodiment of this invention. 本発明の他の実施形態を示すマグネットロールを成型する金型の概略断面図である。It is a schematic sectional drawing of the metal mold | die which shape | molds the magnet roll which shows other embodiment of this invention. 従来のマグネットロールを成型する金型の概略断面図である。It is a schematic sectional drawing of the metal mold | die which shape | molds the conventional magnet roll. 従来のマグネットロールを成型する金型の概略断面図である。It is a schematic sectional drawing of the metal mold | die which shape | molds the conventional magnet roll.

符号の説明Explanation of symbols

１ 金型
２ 円筒部材
３Ａ１〜３Ａ４ 扇形磁石部分
３Ｂ１〜３Ｂ４ 扇形磁石部分
４、５ 基本扇形要素磁石
６Ａ１〜６Ａ４ 非磁性ブロック
６Ｂ１〜６Ｂ４ 非磁性ブロック
７ 基本扇形要素非磁性体
８ 外円筒体
９ 凸部
１０ 凹部
１１ 金型
１２ 倍角扇形要素非磁性体
２１ 金型
２２ 円筒部材
２３Ａ１〜２３Ａ４ 扇形磁石部分
２３Ｂ１〜２３Ｂ４ 扇形磁石部分
２４ 基本扇形要素磁石
２５、２６ 軟質磁性体
２７〜２９ 扇形部分
３０ 外円筒体
３１〜３６ 永久磁石
３７ 凸部
３８ 凹部
３９ 金型
４０ 倍角扇形要素磁石 DESCRIPTION OF SYMBOLS 1 Mold 2 Cylindrical member 3A1-3A4 Fan-shaped magnet part 3B1-3B4 Fan-shaped magnet part 4, 5 Basic fan-shaped element magnet 6A1-6A4 Nonmagnetic block 6B1-6B4 Nonmagnetic block 7 Basic fan-shaped element nonmagnetic body 8 Outer cylindrical body 9 Convex Part 10 Recess 11 Mold 12 Double-angle sector element non-magnetic body 21 Mold 22 Cylindrical member 23A1 to 23A4 Fan-shaped magnet portion 23B1 to 23B4 Fan-shaped magnet portion 24 Basic sector-shaped element magnets 25 and 26 Soft magnetic body 27 to 29 Fan-shaped portion 30 Outer cylinder Body 31-36 Permanent magnet 37 Convex part 38 Concave part 39 Mold 40 Double angle sector element magnet

Claims (4)

円柱状のマグネットローラの外周面に対応する内周面を有する非磁性の円筒部材と、この円筒部材の半径方向外側に設けられ、周方向に互いに離隔して配設された複数の扇形磁石部分とを具え、前記円筒部材により形成されるキャビティ内に磁場を形成するマグネットローラ射出成型用金型において、
それぞれの扇形磁石部分を、所定形状の基本扇形要素磁石、および、この基本扇形要素磁石の扇角を整数倍した倍角扇形要素磁石よりなる群より選ばれた少なくとも一枚の扇形要素磁石を一枚以上周方向に配置して構成し、少なくとも一の扇形磁石部分を、二枚以上の扇形要素磁石で構成してなるマグネットローラ射出成型用金型。 A non-magnetic cylindrical member having an inner peripheral surface corresponding to the outer peripheral surface of the columnar magnet roller, and a plurality of sector magnet portions provided on the radially outer side of the cylindrical member and spaced apart from each other in the circumferential direction In a mold for magnet roller injection molding that forms a magnetic field in a cavity formed by the cylindrical member,
Each sector magnet portion includes at least one sector element magnet selected from the group consisting of a basic sector element magnet having a predetermined shape and a double angle sector element magnet obtained by multiplying the sector angle of the basic sector element magnet by an integer. A magnet roller injection molding die which is configured by arranging in the circumferential direction and at least one sector magnet portion is composed of two or more sector element magnets. 前記扇形磁石部分の磁極の方向を半径方向とし、隣り合う扇形磁石部分の間に形成される扇形の部分を非磁性ブロックで構成し、非磁性ブロックを、前記基本扇形要素磁石と同じ形状の基本扇形要素非磁性体、および、この基本扇形要素非磁性体の扇角を整数倍した倍角扇形要素非磁性体よりなる群より選ばれた少なくとも一枚の扇形要素非磁性体を一枚以上周方向に配置して構成してなる請求項１に記載のマグネットローラ射出成型用金型。   The direction of the magnetic pole of the sector magnet part is a radial direction, the sector part formed between adjacent sector magnet parts is composed of a non-magnetic block, and the non-magnetic block has the same shape as the basic sector element magnet. One or more fan-shaped element nonmagnetic materials selected from the group consisting of a fan-shaped element nonmagnetic material and a double-angle fan-shaped element nonmagnetic material obtained by multiplying the fan angle of the basic fan-shaped element nonmagnetic material by an integer number are circumferentially arranged. The magnet roller injection molding die according to claim 1, wherein the magnet roller injection molding die is arranged. 基本扇形要素磁石の種類を、磁極の向きが相互に逆となる二種類とする請求項２に記載のマグネットローラ射出成型用金型。   The mold for magnet roller injection molding according to claim 2, wherein the types of basic sector element magnets are two types in which the directions of magnetic poles are opposite to each other. 前記扇形磁石部分の磁極の方向を周方向とし、隣り合う扇形磁石部分の間に形成される扇形の部分を軟質磁性体を含んで構成し、基本扇形要素磁石の種類を一種類とする請求項１に記載のマグネットローラ射出成型用金型。   The direction of the magnetic pole of the sector magnet portion is a circumferential direction, the sector portion formed between adjacent sector magnet portions is configured to include a soft magnetic material, and the type of basic sector element magnet is one type. 2. A mold for magnet roller injection molding according to 1.
JP2003344507A 2003-10-02 2003-10-02 Mold for use in injection molding magnet roller Pending JP2005109414A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150197045A1 (en) * 2014-01-10 2015-07-16 Earth Magnets (Hong Kong) Company Limited Method for manufacturing magnetic rollers and system thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150197045A1 (en) * 2014-01-10 2015-07-16 Earth Magnets (Hong Kong) Company Limited Method for manufacturing magnetic rollers and system thereof

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