JP2002195289A

JP2002195289A - Coaxial cylindrical torque limiter and method of manufacturing the same

Info

Publication number: JP2002195289A
Application number: JP2001338810A
Authority: JP
Inventors: Teruo Fujioka; 輝郎藤岡
Original assignee: Yamauchi Corp
Current assignee: Yamauchi Corp
Priority date: 2001-11-05
Filing date: 2001-11-05
Publication date: 2002-07-10

Abstract

PROBLEM TO BE SOLVED: To avoid the inconvenience of sticking a surplus adhesive oozed out of the adhesive layer of a permanent magnet to an area other than that to which the adhesive should be applied. SOLUTION: A rotary shaft 1 is structured to form a difference of the diameter to provide a step difference, consequently, the clearance to retain the adhesive 3e oozed out of the adhesive layer of the permanent magnet 2 is formed by applying the adhesive to the layer thereof while one end surface of the permanent magnet being abutted on one end surface of the step. In this way, the productivity is improved, dispensing with the trouble of wiping out the leaked adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、同軸円筒型トルク
リミッタおよび同軸円筒型トルクリミッタの製造方法に
関し、さらに詳しくは、永久磁石の接着剤層からはみ出
た余剰の接着剤が接着面外に付着することによる不都合
を防止できる同軸円筒型トルクリミッタおよび同軸円筒
型トルクリミッタの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial cylindrical torque limiter and a method for manufacturing a coaxial cylindrical torque limiter. The present invention relates to a coaxial cylindrical torque limiter and a method of manufacturing a coaxial cylindrical torque limiter which can prevent inconvenience caused by the above.

【０００２】[0002]

【従来の技術】図１１は、従来の同軸円筒型トルクリミ
ッタ５００を用いた給紙装置の重送防止用リバースロー
ラの一例を示す端面図である。この同軸円筒型トルクリ
ミッタ５００において、金属製シャフトＳの周りには、
回転軸５１が嵌合されている。この回転軸５１は、外周
面からフランジ５１ｆが突出した円筒形状であり、ポリ
アセタール樹脂（ＰＯＭ）製である。前記回転軸５１の
外周面には、円筒状の永久磁石５２が接着剤層５３を介
して接着される。この永久磁石５２は、フェライト磁石
である。2. Description of the Related Art FIG. 11 is an end view showing an example of a reverse roller for preventing double feed of a paper feeder using a conventional coaxial cylindrical torque limiter 500. In the coaxial cylindrical torque limiter 500, around the metal shaft S,
The rotating shaft 51 is fitted. The rotating shaft 51 has a cylindrical shape with a flange 51f protruding from the outer peripheral surface, and is made of polyacetal resin (POM). A cylindrical permanent magnet 52 is bonded to the outer peripheral surface of the rotating shaft 51 via an adhesive layer 53. This permanent magnet 52 is a ferrite magnet.

【０００３】回転筒２４は、ポリエチレン樹脂，ポリプ
ロピレン樹脂，ポリブテン樹脂等のポリオレフィン樹脂
製である。前記回転筒２４の内周面には、円筒状の半硬
質磁性体２５が圧入にて固着される。前記半硬質磁性体
２５は、Ｆｅ−Ｃｒ−Ｃｏ系合金製である。The rotary cylinder 24 is made of a polyolefin resin such as a polyethylene resin, a polypropylene resin, and a polybutene resin. A cylindrical semi-hard magnetic body 25 is fixed to the inner peripheral surface of the rotary cylinder 24 by press-fitting. The semi-hard magnetic body 25 is made of an Fe-Cr-Co alloy.

【０００４】前記回転軸５１と前記回転筒２４は、前記
永久磁石５２と前記半硬質磁性体２５とがギャップＡを
あけて対向し且つ相対的に回転しうるように、同軸上に
配置されている。前記回転筒２４には、蓋体２４ａが取
り付けられると共にゴムローラＧが嵌合されている。図
中、Ｍは、前記回転軸５１と前記蓋体２４ａとが摺動す
る摺動部である。The rotating shaft 51 and the rotating cylinder 24 are arranged coaxially so that the permanent magnet 52 and the semi-hard magnetic body 25 can face each other with a gap A therebetween and rotate relatively. I have. A lid 24a is attached to the rotary cylinder 24, and a rubber roller G is fitted thereto. In the drawing, M is a sliding portion on which the rotating shaft 51 and the lid 24a slide.

【０００５】前記金属製シャフトＳおよび前記回転軸５
１が回転し、前記永久磁石５２が回転すると、前記永久
磁石５２と前記半硬質磁性体２５の間にヒステリシスト
ルクが働き、前記回転筒２４が回転し、前記ゴムローラ
Ｇが回転する。そして、前記ヒステリシストルクに見合
った力で重送用紙の分離が行われる。The metal shaft S and the rotating shaft 5
When 1 rotates and the permanent magnet 52 rotates, a hysteresis torque acts between the permanent magnet 52 and the semi-hard magnetic body 25, the rotary cylinder 24 rotates, and the rubber roller G rotates. Then, the multi-feed paper is separated by a force corresponding to the hysteresis torque.

【０００６】次に、前記永久磁石５２を接着する手順に
ついて説明する。図１２の（ａ）（ｂ）（ｃ）に示すよ
うに、回転軸５１の外周面に接着剤５３ａを塗布し、そ
の上に永久磁石５２を嵌め被せ、永久磁石５２の下端が
フランジ５１ｆに当接するまで押し下げる。接着剤５３
ａが硬化すると、永久磁石５２が接着剤層５３を介して
回転軸５１に固着される。ところで、図１２の（ｂ）に
示すように、永久磁石５２の押し下げに伴って、接着剤
層５３から余剰の接着剤５３ｅがはみ出す。これによ
り、図１２の（ｃ）に示すように、フランジ５１ｆから
接着剤５３ｅが漏出するが、これを手作業により拭き取
っておく必要がある。その理由は、接着剤５３ｅが摺動
部Ｍに付着すると、回転軸５１と蓋体２４ａとの摺動性
が悪化してトルク値の変動や回転むらを生じるためであ
る。また、接着剤５３ｅが摺動部Ｍに付着しないまで
も、接着面外で接着剤５３ｅに埃や異物が付着して、摺
動部Ｍ以外で回転軸５１が蓋体２４ａなどと接触し、や
はりトルク値の変動や回転むらを生じるためである。Next, a procedure for bonding the permanent magnet 52 will be described. As shown in FIGS. 12A, 12B and 12C, an adhesive 53a is applied to the outer peripheral surface of the rotating shaft 51, a permanent magnet 52 is fitted thereon, and the lower end of the permanent magnet 52 is attached to the flange 51f. Press down until it touches. Adhesive 53
When a is hardened, the permanent magnet 52 is fixed to the rotating shaft 51 via the adhesive layer 53. By the way, as shown in FIG. 12B, the excess adhesive 53 e protrudes from the adhesive layer 53 as the permanent magnet 52 is pushed down. As a result, as shown in FIG. 12C, the adhesive 53e leaks from the flange 51f, but it is necessary to wipe it off manually. The reason is that, when the adhesive 53e adheres to the sliding portion M, the sliding property between the rotating shaft 51 and the lid 24a is deteriorated, causing a variation in torque value and uneven rotation. Further, even if the adhesive 53e does not adhere to the sliding portion M, dust or foreign matter adheres to the adhesive 53e outside the bonding surface, and the rotary shaft 51 contacts the lid 24a or the like other than the sliding portion M, This is also because torque values fluctuate and rotation unevenness occurs.

【０００７】[0007]

【発明が解決しようとする課題】上記従来の同軸円筒型
トルクリミッタ５００では、フランジ５１ｆから漏出し
た接着剤５３ｅを手作業でいちいち拭き取らなければな
らず、手間がかかり、生産性が悪い問題点がある。な
お、接着剤５３ａの塗布量を減らせば漏出を軽減できる
が、接着力が不足して、使用中に永久磁石５２が回転軸
５１から抜け落ちたり，回転軸５１が永久磁石５２とス
リップして空回りしやすくなり、トルクリミッタとして
の信頼性が得られないという問題点がある。また、フラ
ンジ５１ｆの厚みを大きくして、漏出した接着剤５３ｅ
が摺動部Ｍまで達しないようにすることも考えられる
が、フランジの厚み分だけ永久磁石５２の接着許容面積
が狭まるから、永久磁石５２のサイズの上限が相対的に
小さくなり、トルクリミッタの小型化，高トルク化の見
地から不利となる。すなわち、永久磁石５２のサイズが
不変ならばトルクリミッタ全体のサイズが増大し、トル
クリミッタ全体のサイズが不変ならば永久磁石５２のサ
イズが小さくなってしまう。そこで、本発明の目的は、
永久磁石の接着剤層からはみ出た余剰の接着剤が接着面
外に付着することによる不都合を防止できる同軸円筒型
トルクリミッタおよび同軸円筒型トルクリミッタの製造
方法を提供することにある。In the above conventional coaxial cylindrical torque limiter 500, the adhesive 53e leaked from the flange 51f must be manually wiped off one by one, which is troublesome and results in poor productivity. There is. The leakage can be reduced by reducing the application amount of the adhesive 53a, but the adhesive force is insufficient, and the permanent magnet 52 falls off from the rotating shaft 51 during use, or the rotating shaft 51 slips with the permanent magnet 52 and idles. And the reliability as a torque limiter cannot be obtained. In addition, the thickness of the flange 51f is increased so that the leaked adhesive 53e
May not reach the sliding portion M, however, since the allowable bonding area of the permanent magnet 52 is reduced by the thickness of the flange, the upper limit of the size of the permanent magnet 52 becomes relatively small, and the torque limiter This is disadvantageous in terms of downsizing and high torque. That is, if the size of the permanent magnet 52 does not change, the size of the entire torque limiter increases, and if the size of the entire torque limiter does not change, the size of the permanent magnet 52 decreases. Therefore, an object of the present invention is to
It is an object of the present invention to provide a coaxial cylindrical torque limiter and a method of manufacturing a coaxial cylindrical torque limiter which can prevent inconvenience caused by excess adhesive that has protruded from an adhesive layer of a permanent magnet adhering to the outside of an adhesive surface.

【０００８】[0008]

【課題を解決するための手段】第１の観点では、本発明
は、回転軸の外周面または回転筒の内周面に円筒状の永
久磁石を接着し、前記回転軸の外周面または前記回転筒
の内周面のうち前記永久磁石を接着しない方に円筒状の
半硬質磁性体を固着し、ギャップをあけて前記永久磁石
と前記半硬質磁性体を対向させ且つ相対的に回転しうる
ように前記回転軸と前記回転筒とを同軸上に配置し、前
記永久磁石と前記半硬質磁性体との間に生じるヒステリ
シストルクにより前記回転軸と前記回転筒の間で回転を
伝達する同軸円筒型トルクリミッタであって、前記永久
磁石が接着される回転軸（または回転筒）に、余剰の接
着剤を溜める隙間が形成されていることを特徴とする同
軸円筒型トルクリミッタを提供する。上記第１の観点に
よる同軸円筒型トルクリミッタでは、回転軸の外周面ま
たは回転筒の内周面に隙間を形成し、その隙間に、永久
磁石の接着剤層からはみ出た余剰の接着剤を溜める。隙
間は、接着面の内部に形成してもよいし、接着面からあ
る程度離れた位置に形成してもよい。このため、接着面
外に接着剤が漏出することによる不都合を防止でき、次
の作用を奏する。（１）永久磁石の接着に十分な分量の接着剤を塗布した
場合でも、余剰の接着剤を拭き取る必要がなくなり、生
産性を向上できる。（２）余剰の接着剤が摺動部などに付着しないから、摺
動性が悪化してトルク値の変動や回転むらを生じること
を防止できる。（３）永久磁石を強固に接着できるから、トルクリミッ
タとしての信頼性を向上できる。（４）回転軸の外周面に円筒状の永久磁石を接着し、回
転筒の内周面に円筒状の半硬質磁性体を固着する構造の
場合、回転軸の外周面に突出させたフランジの厚みを大
きくしなくても、あるいはフランジを設けなくても、接
着剤の漏出による悪影響を防げる。従って、永久磁石の
サイズを相対的に小さくする必要がないか、あるいは相
対的に大きくすることが可能であり、トルクリミッタの
小型化，高トルク化の見地から有利である。According to a first aspect of the present invention, a cylindrical permanent magnet is adhered to an outer peripheral surface of a rotating shaft or an inner peripheral surface of a rotating cylinder, and the outer peripheral surface of the rotating shaft or the rotating shaft is rotated. A cylindrical semi-hard magnetic body is fixed to the inner peripheral surface of the cylinder to which the permanent magnet is not bonded, so that the permanent magnet and the semi-hard magnetic body can be opposed to each other with a gap and can rotate relatively. A coaxial cylindrical type in which the rotating shaft and the rotating cylinder are arranged coaxially and a rotation is transmitted between the rotating shaft and the rotating cylinder by a hysteresis torque generated between the permanent magnet and the semi-hard magnetic material. Provided is a torque limiter, wherein a gap for storing excess adhesive is formed on a rotating shaft (or a rotating cylinder) to which the permanent magnet is adhered. In the coaxial cylindrical torque limiter according to the first aspect, a gap is formed in the outer peripheral surface of the rotating shaft or the inner peripheral surface of the rotating cylinder, and the excess adhesive that overflows from the adhesive layer of the permanent magnet is stored in the gap. . The gap may be formed inside the bonding surface or may be formed at a position distant from the bonding surface to some extent. For this reason, the inconvenience caused by the adhesive leaking out of the bonding surface can be prevented, and the following operation is achieved. (1) Even when a sufficient amount of adhesive is applied to bond the permanent magnet, there is no need to wipe off excess adhesive, and productivity can be improved. (2) Since the surplus adhesive does not adhere to the sliding portion, it is possible to prevent the slidability from deteriorating and causing a change in torque value and uneven rotation. (3) Since the permanent magnet can be firmly bonded, the reliability as a torque limiter can be improved. (4) In the case of a structure in which a cylindrical permanent magnet is adhered to the outer peripheral surface of the rotating shaft, and a cylindrical semi-hard magnetic material is fixed to the inner peripheral surface of the rotating cylinder, a flange protruding from the outer peripheral surface of the rotating shaft is used. Even if the thickness is not increased or the flange is not provided, adverse effects due to leakage of the adhesive can be prevented. Therefore, the size of the permanent magnet does not need to be relatively small or can be relatively large, which is advantageous from the viewpoint of reducing the size and increasing the torque of the torque limiter.

【０００９】第２の観点では、本発明は、回転軸の外周
面または回転筒の内周面に円筒状の永久磁石を接着し、
前記回転軸の外周面または前記回転筒の内周面のうち前
記永久磁石を接着しない方に円筒状の半硬質磁性体を固
着し、ギャップをあけて前記永久磁石と前記半硬質磁性
体を対向させ且つ相対的に回転しうるように前記回転軸
と前記回転筒とを同軸上に配置し、前記永久磁石と前記
半硬質磁性体との間に生じるヒステリシストルクにより
前記回転軸と前記回転筒の間で回転を伝達する同軸円筒
型トルクリミッタであって、前記永久磁石が接着される
回転軸（または回転筒）と，前記永久磁石との間に、余
剰の接着剤を溜める隙間が形成されていることを特徴と
する同軸円筒型トルクリミッタを提供する。上記第２の
観点による同軸円筒型トルクリミッタでは、回転軸の外
周面または回転筒の内周面と，永久磁石との間に隙間を
形成し、その隙間に、余剰の接着剤を溜める。隙間は、
回転軸または回転筒に溝などを設けることにより形成し
てもよいし，永久磁石に溝や切欠きを設けることにより
形成してもよい。このため、上記第１の観点による作用
と同じ作用を奏する。また、永久磁石を加工して隙間を
形成すれば、回転軸や回転筒の構造が簡単となる。According to a second aspect, the present invention provides a method of bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft or an inner peripheral surface of a rotating cylinder,
A cylindrical semi-hard magnetic body is fixed to the outer peripheral surface of the rotating shaft or the inner peripheral surface of the rotary cylinder, to which the permanent magnet is not bonded, and the permanent magnet and the semi-hard magnetic body are opposed to each other with a gap. The rotating shaft and the rotating cylinder are arranged coaxially so as to be able to rotate relative to each other, and a hysteresis torque generated between the permanent magnet and the semi-hard magnetic body causes the rotating shaft and the rotating cylinder to rotate. A coaxial cylindrical torque limiter for transmitting rotation between the permanent magnets, wherein a gap for storing excess adhesive is formed between a rotating shaft (or a rotating cylinder) to which the permanent magnet is bonded and the permanent magnet. To provide a coaxial cylindrical torque limiter. In the coaxial cylindrical torque limiter according to the second aspect, a gap is formed between the outer peripheral surface of the rotating shaft or the inner peripheral surface of the rotating cylinder and the permanent magnet, and excess adhesive is accumulated in the gap. The gap is
It may be formed by providing a groove or the like in the rotating shaft or the rotating cylinder, or may be formed by providing a groove or notch in the permanent magnet. For this reason, the same operation as the operation according to the first aspect is achieved. If the gap is formed by processing the permanent magnet, the structure of the rotating shaft and the rotating cylinder can be simplified.

【００１０】第３の観点では、本発明は、回転軸の外周
面に円筒状の永久磁石を接着し、回転筒の内周面に円筒
状の半硬質磁性体を固着し、ギャップをあけて前記永久
磁石と前記半硬質磁性体を対向させ且つ相対的に回転し
うるように前記回転軸と前記回転筒とを同軸上に配置
し、前記永久磁石と前記半硬質磁性体との間に生じるヒ
ステリシストルクにより前記回転軸と前記回転筒の間で
回転を伝達する同軸円筒型トルクリミッタであって、前
記回転軸が、摺動部を兼ねる大径部と，前記永久磁石の
接着面を形成される小径部と，前記大径部と前記小径部
との中間に形成され且つ両者との間に段差を付ける中径
部とからなり、前記小径部からの前記中径部の突出面に
前記永久磁石の一端面を当接させて当該永久磁石を接着
し、前記永久磁石の一端面と，前記中径部からの前記大
径部の突出面との間に余剰の接着剤を溜める隙間を形成
したことを特徴とする同軸円筒型トルクリミッタを提供
する。上記第３の観点による同軸円筒型トルクリミッタ
では、永久磁石の接着剤層からはみ出た余剰の接着剤
を、永久磁石の一端面と，大径部の突出面との間に形成
される間隙に溜めるので、接着剤が摺動部に漏出するこ
とが防止される。[0010] In a third aspect, the present invention provides a method in which a cylindrical permanent magnet is adhered to an outer peripheral surface of a rotating shaft, and a cylindrical semi-hard magnetic material is fixed to an inner peripheral surface of a rotating cylinder. The rotating shaft and the rotary cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body are opposed to each other and can relatively rotate, and are generated between the permanent magnet and the semi-hard magnetic body. A coaxial cylindrical torque limiter for transmitting rotation between the rotating shaft and the rotating cylinder by hysteresis torque, wherein the rotating shaft has a large-diameter portion serving also as a sliding portion and an adhesive surface of the permanent magnet. A small-diameter portion, and a middle-diameter portion formed between the large-diameter portion and the small-diameter portion and providing a step between the small-diameter portion and the permanent-diameter portion. The permanent magnet is adhered by bringing one end surface of the magnet into contact, and the permanent magnet is Providing an end face, a coaxial cylindrical torque limiter, characterized in that the formation of the gap accumulating excess of adhesive between the protruding surface of the large diameter portion from the middle diameter portion. In the coaxial cylindrical torque limiter according to the third aspect, the excess adhesive protruding from the adhesive layer of the permanent magnet is applied to a gap formed between one end surface of the permanent magnet and the protruding surface of the large diameter portion. Since it is stored, the adhesive is prevented from leaking to the sliding portion.

【００１１】第４の観点では、本発明は、回転軸の外周
面に円筒状の永久磁石を接着し、回転筒の内周面に円筒
状の半硬質磁性体を固着し、ギャップをあけて前記永久
磁石と前記半硬質磁性体を対向させ且つ相対的に回転し
うるように前記回転軸と前記回転筒とを同軸上に配置
し、前記永久磁石と前記半硬質磁性体との間に生じるヒ
ステリシストルクにより前記回転軸と前記回転筒の間で
回転を伝達する同軸円筒型トルクリミッタであって、前
記回転軸が、摺動部を兼ねる大径部と，前記永久磁石の
接着面を形成される小径部と，前記大径部と前記小径部
との中間に形成され且つ両者との間に段差を付ける中径
部とからなり、前記中径部からの前記大径部の突出面に
前記中径部に続く円周方向の溝を刻設し、前記小径部か
らの前記中径部の突出面に前記永久磁石の一端面を当接
させて当該永久磁石を接着し、前記溝内に余剰の接着剤
を溜めることを特徴とする同軸円筒型トルクリミッタを
提供する。上記第４の観点による同軸円筒型トルクリミ
ッタでは、永久磁石の接着剤層からはみ出た余剰の接着
剤を、大径部の突出面に刻設された溝内に溜めるので、
接着剤が摺動部に漏出することが防止される。また、溝
内の溜め容量は十分に大きいので、漏出防止性能が高
い。[0011] In a fourth aspect, the present invention provides a method in which a cylindrical permanent magnet is bonded to an outer peripheral surface of a rotating shaft, and a cylindrical semi-hard magnetic material is fixed to an inner peripheral surface of a rotating cylinder. The rotating shaft and the rotary cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body are opposed to each other and can relatively rotate, and are generated between the permanent magnet and the semi-hard magnetic body. A coaxial cylindrical torque limiter for transmitting rotation between the rotating shaft and the rotating cylinder by hysteresis torque, wherein the rotating shaft has a large-diameter portion serving also as a sliding portion and an adhesive surface of the permanent magnet. A small-diameter portion, and a middle-diameter portion formed between the large-diameter portion and the small-diameter portion and providing a step between the small-diameter portion and the small-diameter portion. Engraving a circumferential groove following the middle diameter part, and projecting the middle diameter part from the small diameter part It is brought into contact with one end face of the permanent magnet to the surface adhered to the permanent magnet, to provide a coaxial cylindrical torque limiter, characterized in that accumulating excess glue in said groove. In the coaxial cylindrical torque limiter according to the fourth aspect, the excess adhesive that has protruded from the adhesive layer of the permanent magnet is stored in the groove formed on the protruding surface of the large-diameter portion.
The adhesive is prevented from leaking to the sliding part. Further, since the capacity of the reservoir in the groove is sufficiently large, the leakage prevention performance is high.

【００１２】第５の観点では、本発明は、回転軸の外周
面に円筒状の永久磁石を接着し、回転筒の内周面に円筒
状の半硬質磁性体を固着し、ギャップをあけて前記永久
磁石と前記半硬質磁性体とを対向させ且つ相対的に回転
しうるように前記回転軸と前記回転筒とを同軸上に配置
し、前記永久磁石と前記半硬質磁性体との間に生じるヒ
ステリシストルクにより前記回転軸と前記回転筒の間で
回転を伝達する同軸円筒型トルクリミッタであって、前
記回転軸の外周面から中径部と大径部とを含む段差付き
フランジが突出し、その段差付きフランジの中径部側端
面に前記永久磁石の一端面を当接させて当該永久磁石を
接着し、前記永久磁石の一端面と，前記段差付きフラン
ジの前記中径部からの前記大径部の突出面との間に余剰
の接着剤を溜める隙間を形成したことを特徴とする同軸
円筒型トルクリミッタを提供する。上記第５の観点によ
る同軸円筒型トルクリミッタでは、永久磁石の接着剤層
からはみ出た余剰の接着剤を、永久磁石の一端面と，段
差付きフランジの段差を隔てた突出面との間に形成され
る間隙に溜めるので、接着剤が摺動部に漏出することが
防止される。According to a fifth aspect of the present invention, a cylindrical permanent magnet is adhered to an outer peripheral surface of a rotating shaft, and a cylindrical semi-hard magnetic material is fixed to an inner peripheral surface of a rotating cylinder. The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body can be opposed and relatively rotated, and between the permanent magnet and the semi-hard magnetic body. A coaxial cylindrical torque limiter that transmits rotation between the rotating shaft and the rotating cylinder by the generated hysteresis torque, wherein a stepped flange including a middle diameter portion and a large diameter portion protrudes from an outer peripheral surface of the rotating shaft, One end face of the permanent magnet is brought into contact with the end face of the stepped flange at the middle diameter side, and the permanent magnet is adhered to the end face of the stepped flange. Store excess adhesive between the protruding surface of the diameter part To provide a coaxial cylindrical torque limiter, characterized in that formed between. In the coaxial cylindrical torque limiter according to the fifth aspect, the excess adhesive protruding from the adhesive layer of the permanent magnet is formed between one end surface of the permanent magnet and the protruding surface of the stepped flange separated by the step. The adhesive is prevented from leaking to the sliding part because it is stored in the gap.

【００１３】第６の観点では、本発明は、回転軸の外周
面に円筒状の永久磁石を接着し、回転筒の内周面に円筒
状の半硬質磁性体を固着し、ギャップをあけて前記永久
磁石と前記半硬質磁性体を対向させ且つ相対的に回転し
うるように前記回転軸と前記回転筒とを同軸上に配置
し、前記永久磁石と前記半硬質磁性体との間に生じるヒ
ステリシストルクにより前記回転軸と前記回転筒の間で
回転を伝達する同軸円筒型トルクリミッタであって、前
記回転軸が、摺動部を兼ねる大径部と，前記永久磁石の
接着面を形成される小径部とからなり、前記小径部の大
径部側端部の外周面に周溝を形成し、前記小径部からの
前記大径部の突出面に前記永久磁石の一端面を当接させ
て当該永久磁石を接着し、前記周溝内に余剰の接着剤を
溜めることを特徴とする同軸円筒型トルクリミッタを提
供する。上記第６の観点による同軸円筒型トルクリミッ
タでは、永久磁石の接着剤層からはみ出た余剰の接着剤
を、回転軸の大径部側端部の外周面に形成された周溝に
溜めるので、接着剤が摺動部に漏出することが防止され
る。また、永久磁石の一端面と回転軸との間に間隙が原
理的に生じず、余剰の接着剤が閉空間内に閉じ込められ
るので、接着剤の漏出防止の見地からいっそう好都合で
ある。According to a sixth aspect of the present invention, a cylindrical permanent magnet is adhered to an outer peripheral surface of a rotating shaft, and a cylindrical semi-hard magnetic material is fixed to an inner peripheral surface of a rotating cylinder. The rotating shaft and the rotary cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body are opposed to each other and can relatively rotate, and are generated between the permanent magnet and the semi-hard magnetic body. A coaxial cylindrical torque limiter for transmitting rotation between the rotating shaft and the rotating cylinder by hysteresis torque, wherein the rotating shaft has a large-diameter portion serving also as a sliding portion and an adhesive surface of the permanent magnet. A peripheral groove is formed on the outer peripheral surface of the large-diameter portion side end of the small-diameter portion, and one end surface of the permanent magnet is brought into contact with the projecting surface of the large-diameter portion from the small-diameter portion. Characterized in that the permanent magnet is adhered and excess adhesive is accumulated in the circumferential groove. To provide a coaxial cylindrical torque limiter that. In the coaxial cylindrical torque limiter according to the sixth aspect, the excess adhesive protruding from the adhesive layer of the permanent magnet is stored in the circumferential groove formed on the outer peripheral surface of the large-diameter portion side end of the rotating shaft. The adhesive is prevented from leaking to the sliding part. In addition, a gap is not generated between the one end surface of the permanent magnet and the rotating shaft in principle, and the surplus adhesive is confined in the closed space, which is more advantageous from the viewpoint of preventing leakage of the adhesive.

【００１４】第７の観点では、本発明は、回転軸の外周
面に円筒状の永久磁石を接着し、回転筒の内周面に円筒
状の半硬質磁性体を固着し、ギャップをあけて前記永久
磁石と前記半硬質磁性体を対向させ且つ相対的に回転し
うるように前記回転軸と前記回転筒とを同軸上に配置
し、前記永久磁石と前記半硬質磁性体との間に生じるヒ
ステリシストルクにより前記回転軸と前記回転筒の間で
回転を伝達する同軸円筒型トルクリミッタであって、前
記回転軸が、摺動部を兼ねる大径部と，前記永久磁石の
接着面を形成される小径部とからなり、前記接着面の中
間部分に周溝を形成し、前記小径部からの前記大径部の
突出面に前記永久磁石の一端面を当接させて当該永久磁
石を接着し、前記周溝内に余剰の接着剤を溜めることを
特徴とする同軸円筒型トルクリミッタを提供する。上記
第７の観点による同軸円筒型トルクリミッタでは、接着
面の中間部分に周溝を形成するので、上記第６の観点に
よる作用と同じ作用を奏する。According to a seventh aspect of the present invention, a cylindrical permanent magnet is adhered to an outer peripheral surface of a rotating shaft, and a cylindrical semi-hard magnetic material is fixed to an inner peripheral surface of a rotating cylinder. The rotating shaft and the rotary cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body are opposed to each other and can relatively rotate, and are generated between the permanent magnet and the semi-hard magnetic body. A coaxial cylindrical torque limiter for transmitting rotation between the rotating shaft and the rotating cylinder by hysteresis torque, wherein the rotating shaft has a large-diameter portion serving also as a sliding portion and an adhesive surface of the permanent magnet. A peripheral groove is formed in an intermediate portion of the bonding surface, and one end surface of the permanent magnet is brought into contact with a protruding surface of the large diameter portion from the small diameter portion to bond the permanent magnet. A coaxial cylinder, which stores excess adhesive in the circumferential groove. To provide a torque limiter. In the coaxial cylindrical torque limiter according to the seventh aspect, since the circumferential groove is formed in the intermediate portion of the bonding surface, the same action as the action according to the sixth aspect is exerted.

【００１５】第８の観点では、本発明は、回転軸の外周
面に円筒状の永久磁石を接着し、回転筒の内周面に円筒
状の半硬質磁性体を固着し、ギャップをあけて前記永久
磁石と前記半硬質磁性体を対向させ且つ相対的に回転し
うるように前記回転軸と前記回転筒とを同軸上に配置
し、前記永久磁石と前記半硬質磁性体との間に生じるヒ
ステリシストルクにより前記回転軸と前記回転筒の間で
回転を伝達する同軸円筒型トルクリミッタであって、前
記回転軸が、摺動部を兼ねる大径部と，前記永久磁石の
接着面を形成される小径部とからなり、前記回転軸の外
周面に軸方向に１以上の凹条を刻設して、前記小径部か
らの前記大径部の突出面に前記永久磁石の一端面を当接
させて当該永久磁石を接着し、前記凹条内に余剰の接着
剤を溜めることを特徴とする同軸円筒型トルクリミッタ
を提供する。上記第８の観点による同軸円筒型トルクリ
ミッタでは、余剰の接着剤を、回転軸の外周面に刻設さ
れた凹条内に溜めるので、接着剤が摺動部に漏出するこ
とが防止される。また、凹条は軸方向に刻設されている
から、凹条内に入り込んで硬化した接着剤が永久磁石の
スリップ防止機能を果たし、永久磁石をいっそう強固に
接着することが出来る。According to an eighth aspect of the present invention, a cylindrical permanent magnet is adhered to an outer peripheral surface of a rotating shaft, and a cylindrical semi-hard magnetic material is fixed to an inner peripheral surface of a rotating cylinder. The rotating shaft and the rotary cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body are opposed to each other and can relatively rotate, and are generated between the permanent magnet and the semi-hard magnetic body. A coaxial cylindrical torque limiter for transmitting rotation between the rotating shaft and the rotating cylinder by hysteresis torque, wherein the rotating shaft has a large-diameter portion serving also as a sliding portion and an adhesive surface of the permanent magnet. One or more concave streaks are formed in the outer peripheral surface of the rotary shaft in the axial direction, and one end surface of the permanent magnet is brought into contact with the protruding surface of the large diameter portion from the small diameter portion. And bonding the permanent magnet to store the excess adhesive in the groove. To provide a coaxial cylindrical torque limiter to. In the coaxial cylindrical torque limiter according to the eighth aspect, the surplus adhesive is stored in the groove formed on the outer peripheral surface of the rotating shaft, so that the adhesive is prevented from leaking to the sliding portion. . Further, since the concave stripes are engraved in the axial direction, the adhesive that has entered the concave stripes and hardened performs the function of preventing slippage of the permanent magnets, so that the permanent magnets can be more firmly bonded.

【００１６】第９の観点では、本発明は、回転軸の外周
面に円筒状の永久磁石を接着し、回転筒の内周面に円筒
状の半硬質磁性体を固着し、ギャップをあけて前記永久
磁石と前記半硬質磁性体を対向させ且つ相対的に回転し
うるように前記回転軸と前記回転筒とを同軸上に配置
し、前記永久磁石と前記半硬質磁性体との間に生じるヒ
ステリシストルクにより前記回転軸と前記回転筒の間で
回転を伝達する同軸円筒型トルクリミッタであって、前
記回転軸が、摺動部を兼ねる大径部と，前記永久磁石の
接着面を形成される小径部とからなり、前記永久磁石の
一端の内周面に切欠きを形成し、前記小径部からの前記
大径部の突出面に前記永久磁石の一端面を当接させて当
該永久磁石を接着し、前記切欠き内に余剰の接着剤を溜
めることを特徴とする同軸円筒型トルクリミッタを提供
する。上記第９の観点による同軸円筒型トルクリミッタ
では、永久磁石の接着剤層からはみ出た余剰の接着剤
を、永久磁石に形成した切欠き内に溜めるので、接着剤
が摺動部に漏出することが防止される。また、回転軸に
間隙を形成するための段差や溝などを設ける必要がなく
なり、回転軸の構造が簡単となる。According to a ninth aspect of the present invention, a cylindrical permanent magnet is adhered to an outer peripheral surface of a rotating shaft, and a cylindrical semi-hard magnetic material is fixed to an inner peripheral surface of a rotating cylinder. The rotating shaft and the rotary cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body are opposed to each other and can relatively rotate, and are generated between the permanent magnet and the semi-hard magnetic body. A coaxial cylindrical torque limiter for transmitting rotation between the rotating shaft and the rotating cylinder by hysteresis torque, wherein the rotating shaft has a large-diameter portion serving also as a sliding portion and an adhesive surface of the permanent magnet. A notch is formed in the inner peripheral surface at one end of the permanent magnet, and one end surface of the permanent magnet is brought into contact with a protruding surface of the large diameter portion from the small diameter portion, thereby forming the permanent magnet. And bonding excess adhesive in the notch. To provide a coaxial cylindrical torque limiter. In the coaxial cylindrical torque limiter according to the ninth aspect, the excess adhesive that has protruded from the adhesive layer of the permanent magnet is stored in the notch formed in the permanent magnet, so that the adhesive leaks to the sliding portion. Is prevented. Further, there is no need to provide a step or a groove for forming a gap in the rotating shaft, and the structure of the rotating shaft is simplified.

【００１７】第１０の観点では、本発明は、回転筒の内
周面に円筒状の永久磁石を接着し、回転軸の外周面に円
筒状の半硬質磁性体を固着し、ギャップをあけて前記永
久磁石と前記半硬質磁性体を対向させ且つ相対的に回転
しうるように前記回転筒と前記回転軸とを同軸上に配置
し、前記永久磁石と前記半硬質磁性体との間に生じるヒ
ステリシストルクにより前記回転軸と前記回転筒の間で
回転を伝達する同軸円筒型トルクリミッタであって、前
記回転筒の肉厚を変えて内周面に段差を形成し、前記段
差の上側面に前記永久磁石の一端面を当接させて当該永
久磁石を接着し、前記永久磁石の一端面と，前記段差の
下側面との間に余剰の接着剤を溜める隙間を形成したこ
とを特徴とする同軸円筒型トルクリミッタを提供する。
上記第１０の観点による同軸円筒型トルクリミッタで
は、回転筒に永久磁石を接着するタイプの場合でも、永
久磁石の接着剤層からはみ出た余剰の接着剤を、永久磁
石の一端面と，回転筒との間に形成される間隙に溜め
て、接着剤が永久磁石と半硬質磁性体とのギャップや，
回転軸と回転筒との摺動部に漏出することを防止でき
る。According to a tenth aspect of the present invention, a cylindrical permanent magnet is adhered to an inner peripheral surface of a rotary cylinder, and a cylindrical semi-hard magnetic material is fixed to an outer peripheral surface of a rotary shaft. The rotating cylinder and the rotating shaft are arranged coaxially so that the permanent magnet and the semi-hard magnetic body can be opposed to each other and relatively rotated, and are generated between the permanent magnet and the semi-hard magnetic body. A coaxial cylindrical torque limiter that transmits rotation between the rotating shaft and the rotating cylinder by hysteresis torque, wherein a step is formed on an inner peripheral surface by changing a thickness of the rotating cylinder, and an upper surface of the step is formed on an upper surface of the step. One end surface of the permanent magnet is brought into contact with the permanent magnet to bond the permanent magnet, and a gap is formed between one end surface of the permanent magnet and a lower surface of the step to store excess adhesive. A coaxial cylindrical torque limiter is provided.
In the coaxial cylindrical torque limiter according to the tenth aspect, even in the case of a type in which a permanent magnet is adhered to a rotating cylinder, excess adhesive protruding from an adhesive layer of the permanent magnet is removed from one end surface of the permanent magnet and the rotating cylinder. And the gap is formed between the permanent magnet and the semi-hard magnetic material.
Leakage to the sliding portion between the rotating shaft and the rotating cylinder can be prevented.

【００１８】第１１の観点では、本発明は、上記第７の
観点による同軸円筒型トルクリミッタを製造する方法に
おいて、前記永久磁石を前記回転軸の外周面に嵌め被せ
る際、前記永久磁石の一端が前記周溝の真上またはその
近傍に来たときに、当該永久磁石を軸方向に複数回往復
させることを特徴とする同軸円筒型トルクリミッタの製
造方法を提供する。上記第１１の観点による同軸円筒型
トルクリミッタの製造方法では、永久磁石を周溝付近で
往復させるので、余剰の接着剤を周溝内へ十分に入り込
ませることができ、漏出防止性能を更にいっそう高める
ことが出来る。According to an eleventh aspect, the present invention provides the method of manufacturing a coaxial cylindrical torque limiter according to the seventh aspect, wherein the permanent magnet is fitted over an outer peripheral surface of the rotary shaft. The present invention provides a method for manufacturing a coaxial cylindrical torque limiter, characterized in that, when the magnet comes directly above or near the circumferential groove, the permanent magnet is reciprocated a plurality of times in the axial direction. In the method for manufacturing a coaxial cylindrical torque limiter according to the eleventh aspect, since the permanent magnet is reciprocated in the vicinity of the circumferential groove, the excess adhesive can sufficiently enter the circumferential groove, and the leakage prevention performance is further improved. Can be enhanced.

【００１９】第１２の観点では、本発明は、上記第８の
観点による同軸円筒型トルクリミッタを製造する方法に
おいて、前記永久磁石を回転させながら前記回転軸の外
周面に嵌め被せることを特徴とする同軸円筒型トルクリ
ミッタの製造方法を提供する。上記第１２の観点による
同軸円筒型トルクリミッタの製造方法では、永久磁石を
回転させながら嵌め被せるので、余剰の接着剤を凹条内
へ十分に入り込ませることができ、漏出防止性能を更に
いっそう高めることが出来る。According to a twelfth aspect, the present invention provides the method for manufacturing a coaxial cylindrical torque limiter according to the eighth aspect, wherein the permanent magnet is rotated while being fitted to an outer peripheral surface of the rotary shaft. To provide a method for manufacturing a coaxial cylindrical torque limiter. In the method of manufacturing a coaxial cylindrical torque limiter according to the twelfth aspect, since the permanent magnet is fitted while rotating, the excess adhesive can sufficiently enter the recess, and the leakage prevention performance can be further improved. I can do it.

【００２０】[0020]

【発明の実施の形態】以下、図に示す実施の形態により
本発明をさらに詳細に説明する。なお、これにより本発
明が限定されるものではない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this.

【００２１】−第１の実施形態− 図１は、本発明の第１の実施形態にかかる同軸円筒型ト
ルクリミッタ１０を用いた給紙装置の重送防止用リバー
スローラを示す端面図である。この同軸円筒型トルクリ
ミッタ１０において、金属製シャフトＳの周りには、回
転軸１が嵌合されている。この回転軸１は、摺動部Ｍを
兼ねる大径部（図２の１ａ）と，後述の永久磁石２の接
着面を形成される小径部（図２の１ｃ）と、前記大径部
と前記小径部との中間に形成され且つ両者の間に段差を
付ける中径部（図２の１ｂ）とからなり、アルミニウム
合金や，亜鉛合金や，ステンレス鋼や，鉛合金や，銅合
金などの金属材料製である。なお、金属材料の他にポリ
アセタール樹脂も使用される。さらに、ポリエチレン樹
脂，ポリプロピレン樹脂，ポリブテン樹脂等のポリオレ
フィン樹脂も使用される。前記回転軸１の外周面には、
円筒状の永久磁石２が接着剤層３を介して接着される。
前記永久磁石２の一端面と，前記回転軸１との隙間に
は、接着剤層３からはみ出た余剰の接着剤３ｅが溜めら
れる（図２を参照して後で詳しく説明する）。前記永久
磁石２は、Ｎｄ−Ｆｅ−Ｂ系磁石や，Ｓｍ−Ｆｅ−Ｎ系
磁石や，Ｓｍ−Ｃｏ系磁石などの希土類磁石である。な
お、希土類磁石の他に、フェライト磁石も使用される。
希土類磁石は、トルクリミッタの小型化や，高トルク化
の見地から有利である。また、前記希土類磁石やフェラ
イト磁石は、焼結磁石や樹脂磁石であってもよい。First Embodiment FIG. 1 is an end view showing a double feed prevention reverse roller of a paper feeder using a coaxial cylindrical torque limiter 10 according to a first embodiment of the present invention. In the coaxial cylindrical torque limiter 10, the rotating shaft 1 is fitted around the metal shaft S. The rotating shaft 1 has a large-diameter portion (1a in FIG. 2) also serving as a sliding portion M, a small-diameter portion (1c in FIG. 2) on which a bonding surface of a permanent magnet 2 described later is formed, and the large-diameter portion. A middle diameter portion (1b in FIG. 2) formed in the middle of the small diameter portion and providing a step between them is made of aluminum alloy, zinc alloy, stainless steel, lead alloy, copper alloy, or the like. Made of metal material. In addition, a polyacetal resin is also used in addition to the metal material. Further, polyolefin resins such as polyethylene resin, polypropylene resin and polybutene resin are also used. On the outer peripheral surface of the rotating shaft 1,
A cylindrical permanent magnet 2 is bonded via an adhesive layer 3.
An excess adhesive 3e protruding from the adhesive layer 3 is stored in a gap between one end surface of the permanent magnet 2 and the rotary shaft 1 (described later in detail with reference to FIG. 2). The permanent magnet 2 is a rare earth magnet such as an Nd—Fe—B magnet, an Sm—Fe—N magnet, or an Sm—Co magnet. In addition to the rare earth magnet, a ferrite magnet is also used.
Rare earth magnets are advantageous from the viewpoint of reducing the size of the torque limiter and increasing the torque. Further, the rare earth magnet or the ferrite magnet may be a sintered magnet or a resin magnet.

【００２２】回転筒４は、ポリエチレン樹脂，ポリプロ
ピレン樹脂，ポリブテン樹脂等のポリオレフィン樹脂や
ポリアセタール樹脂などの合成樹脂材料製である。前記
回転筒４の内周面には、円筒状の半硬質磁性体５が圧入
にて固着される。前記半硬質磁性体５は、Ｆｅ−Ｃｒ−
Ｃｏ系合金製である。なお、Ｆｅ−Ｃｒ−Ｃｏ系合金の
他に、Ｆｅ−Ｃｏ系合金も使用される。The rotary cylinder 4 is made of a synthetic resin material such as a polyolefin resin such as a polyethylene resin, a polypropylene resin, and a polybutene resin, and a polyacetal resin. A cylindrical semi-hard magnetic body 5 is fixed to the inner peripheral surface of the rotary cylinder 4 by press-fitting. The semi-hard magnetic material 5 is made of Fe-Cr-
It is made of a Co-based alloy. In addition to the Fe-Cr-Co alloy, an Fe-Co alloy is also used.

【００２３】回転軸１は、回転筒４の中に挿入され、回
転軸１の端面が回転筒４の底面に当接することで、回転
軸１と回転筒４との軸方向の相対的な位置決めがなされ
る。そして、前記回転軸１と前記回転筒４は、前記永久
磁石２と前記半硬質磁性体５とがギャップＡをあけて対
向し且つ相対的に回転しうるように、同軸上に配置され
ている。前記回転筒４には、蓋体４ａが取り付けられる
と共にゴムローラＧが嵌合されている。The rotating shaft 1 is inserted into the rotating cylinder 4, and the end surface of the rotating shaft 1 abuts against the bottom surface of the rotating cylinder 4, thereby positioning the rotating shaft 1 and the rotating cylinder 4 relatively in the axial direction. Is made. The rotating shaft 1 and the rotating cylinder 4 are arranged coaxially so that the permanent magnet 2 and the semi-hard magnetic body 5 can face each other with a gap A therebetween and rotate relatively. . A lid 4a is attached to the rotary cylinder 4, and a rubber roller G is fitted thereto.

【００２４】なお、回転軸１の端面が回転筒４の底面に
当接したとき、永久磁石２の面長の中心は半硬質磁性体
５の面長の中心よりも蓋体４ａ側に若干ずれた状態とな
るように予め設計してある。このため、永久磁石２と半
硬質磁性体５との間には前記ずれを補正する方向に移動
しようとする力が磁気的に作用するから、回転軸１の端
面が回転筒４の底面に当接した状態は維持され、回転軸
１と回転筒４との軸方向における相対的な位置関係は安
定している。When the end surface of the rotary shaft 1 comes into contact with the bottom surface of the rotary cylinder 4, the center of the surface length of the permanent magnet 2 is slightly shifted from the center of the surface length of the semi-hard magnetic body 5 toward the lid 4a. It is designed in advance so as to be in a state of being closed. For this reason, a force for moving the permanent magnet 2 and the semi-hard magnetic body 5 in a direction for correcting the displacement magnetically acts, so that the end face of the rotating shaft 1 contacts the bottom surface of the rotating cylinder 4. The contact state is maintained, and the relative positional relationship between the rotating shaft 1 and the rotating cylinder 4 in the axial direction is stable.

【００２５】前記金属製シャフトＳおよび前記回転軸１
が回転し、前記永久磁石２が回転すると、前記永久磁石
２と前記半硬質磁性体５の間にヒステリシストルクが働
き、前記回転筒４が回転し、前記ゴムローラＧが回転す
る。そして、前記ヒステリシストルクに見合った力で重
送用紙の分離が行われる。The metal shaft S and the rotating shaft 1
When the permanent magnet 2 rotates, a hysteresis torque acts between the permanent magnet 2 and the semi-hard magnetic body 5 to rotate the rotary cylinder 4 and rotate the rubber roller G. Then, the multi-feed paper is separated by a force corresponding to the hysteresis torque.

【００２６】次に、前記永久磁石２を接着する手順につ
いて説明する。図２の（ａ）に示すように、回転軸１の
外周面に接着剤３ａを塗布する。次に、図２の（ｂ）に
示すように、永久磁石２を嵌め被せ、永久磁石２の下端
面が小径部１ｃからの中径部１ｂの突出面Ｒに当接する
まで押し下げる。永久磁石２の押し下げに伴って、接着
剤層３から接着剤３ｅがはみ出す。ここで、永久磁石２
は無着磁とする。その理由は、接着剤３ａの硬化を待っ
ている永久磁石２が、他の永久磁石（２）と相互に吸着
し合ったり、周囲の磁性粉を吸着したりするのを防止す
るためである。すなわち、永久磁石２が他の永久磁石
（２）と相互に吸着し合うと未硬化の接着剤３ａにかか
る圧力が不均等になるから、これを防ぐ必要がある。し
かし、着磁した永久磁石同士が相互に吸着するのを防ぐ
には、それぞれを離して置く必要があり、広い場所を要
し、取り扱いに不便になる。また、着磁した永久磁石２
が周囲の磁性粉を吸着すると、滑らかな回転の障害にな
るため、これを後で除去する必要があり、管理の負担が
重くなる。Next, a procedure for bonding the permanent magnet 2 will be described. As shown in FIG. 2A, an adhesive 3a is applied to the outer peripheral surface of the rotating shaft 1. Next, as shown in FIG. 2B, the permanent magnet 2 is fitted and covered, and is pushed down until the lower end surface of the permanent magnet 2 comes into contact with the projecting surface R of the middle diameter portion 1b from the small diameter portion 1c. As the permanent magnet 2 is pushed down, the adhesive 3e protrudes from the adhesive layer 3. Here, the permanent magnet 2
Is not magnetized. The reason is to prevent the permanent magnet 2 waiting for the curing of the adhesive 3a from mutually adsorbing with the other permanent magnets (2) or adsorbing surrounding magnetic powder. That is, if the permanent magnet 2 attracts each other with the other permanent magnets (2), the pressure applied to the uncured adhesive 3a becomes uneven, and it is necessary to prevent this. However, in order to prevent the magnetized permanent magnets from being attracted to each other, they need to be separated from each other, requiring a large space, which is inconvenient to handle. In addition, the magnetized permanent magnet 2
If the magnetic powder adsorbs the surrounding magnetic powder, it becomes a hindrance to smooth rotation, and this must be removed later, which increases the management burden.

【００２７】図２の（ｃ）に示すように、接着剤３ａが
硬化すると、永久磁石２が接着剤層３を介して回転軸１
に接着される。前記接着剤層３の厚さＬは、例えば３０
μｍ〜１００μｍ程度である。永久磁石２からはみ出た
接着剤３ｅは、前記永久磁石２の下端面と回転軸１の大
径部１ａとの間に形成される間隙に溜まるので、接着剤
３ｅが摺動部Ｍに漏出することが防止される。その後、
永久磁石２の外周面を多極着磁する。As shown in FIG. 2C, when the adhesive 3a is hardened, the permanent magnet 2 is rotated via the adhesive layer 3 by the rotating shaft 1.
Adhered to. The thickness L of the adhesive layer 3 is, for example, 30.
It is about μm to 100 μm. The adhesive 3e protruding from the permanent magnet 2 accumulates in a gap formed between the lower end surface of the permanent magnet 2 and the large diameter portion 1a of the rotating shaft 1, so that the adhesive 3e leaks to the sliding portion M. Is prevented. afterwards,
The outer peripheral surface of the permanent magnet 2 is multipolar magnetized.

【００２８】以上の同軸円筒型トルクリミッタ１０によ
れば、永久磁石２からはみ出た接着剤３ｅが永久磁石２
の下端面と回転軸１の大径部１ａとの間に形成される間
隙に溜まるので、接着剤３ｅが接着面外に漏出すること
が防止される。According to the coaxial cylindrical torque limiter 10 described above, the adhesive 3e protruding from the permanent magnet 2
Is accumulated in a gap formed between the lower end face of the rotary shaft 1 and the large-diameter portion 1a of the rotating shaft 1, so that the adhesive 3e is prevented from leaking out of the bonding surface.

【００２９】−第２の実施形態− 第２の実施形態にかかる永久磁石２を接着する手順につ
いて説明する。図３の（ａ）に示すように、回転軸１の
外周面にプライマーＰを塗布し、乾燥させる。前記回転
軸１は、ドラム形状であり、ポリエチレン樹脂，ポリプ
ロピレン樹脂，ポリブテン樹脂等のポリオレフィン樹脂
やポリアセタール樹脂などの合成樹脂材料製である。次
に、図３の（ｂ）に示すように、プライマー処理された
回転軸１’の外周面上に、シアノアクリレート系の接着
剤３ａを塗布する。次に、図３の（ｃ）に示すように、
無着磁の永久磁石２を嵌め被せて、永久磁石２の下端面
が小径部からの中径部の突出面Ｒに当接するまで押し下
げる。そして、図３の（ｄ）に示すように、接着剤３ａ
を硬化させると、回転軸１’に接着剤層３を介して永久
磁石２が接着される。その後、永久磁石２の外周面を多
極着磁する。以上の第２の実施形態によれば、上記第１
の実施形態による効果に加えて、合成樹脂製の回転軸１
を用いるため、優れた摺動性が得られる。また、プライ
マー処理された回転軸１’の外周面と接着剤層３との間
に化学結合が形成されているため、接着力が得にくい合
成樹脂製の回転軸１の外周面に永久磁石２を強固に接着
することができ、永久磁石２の剥離が防止され、トルク
リミッタとしての信頼性が向上する。Second Embodiment A procedure for bonding a permanent magnet 2 according to a second embodiment will be described. As shown in FIG. 3A, a primer P is applied to the outer peripheral surface of the rotating shaft 1 and dried. The rotating shaft 1 has a drum shape and is made of a synthetic resin material such as a polyolefin resin such as a polyethylene resin, a polypropylene resin, and a polybutene resin, and a polyacetal resin. Next, as shown in FIG. 3B, a cyanoacrylate-based adhesive 3a is applied on the outer peripheral surface of the rotating shaft 1 ′ subjected to the primer treatment. Next, as shown in FIG.
The non-magnetized permanent magnet 2 is fitted over and pushed down until the lower end surface of the permanent magnet 2 comes into contact with the protruding surface R from the small diameter portion to the middle diameter portion. Then, as shown in FIG. 3D, the adhesive 3a
Is cured, the permanent magnet 2 is bonded to the rotating shaft 1 ′ via the adhesive layer 3. Thereafter, the outer peripheral surface of the permanent magnet 2 is multipolar magnetized. According to the second embodiment, the first
In addition to the effects of the embodiment, the rotating shaft 1 made of synthetic resin
, Excellent slidability is obtained. In addition, since a chemical bond is formed between the outer peripheral surface of the primer-treated rotary shaft 1 ′ and the adhesive layer 3, the permanent magnet 2 Can be firmly bonded, peeling of the permanent magnet 2 is prevented, and reliability as a torque limiter is improved.

【００３０】−第３の実施形態− 第３の実施形態にかかる永久磁石２を接着する手順につ
いて説明する。図４の（ａ）に示すように、回転軸１の
外周面に接着剤３ａを塗布する。この回転軸１は、図２
の回転軸１の中径部１ｂからの大径部１ａの突出面に、
前記中径部１ｂに続く円周方向の溝１Ｕを刻設した構成
である。次に、図４の（ｂ）に示すように、無着磁の永
久磁石２を嵌め被せ、永久磁石２の下端面が小径部から
の中径部の突出面Ｒ（溝１Ｕの内側の周面）に当接する
まで押し下げる。永久磁石２の押し下げに伴って、接着
剤層３から余剰の接着剤３ｅがはみ出す。そして、図４
の（ｃ）に示すように、接着剤３ａが硬化すると、永久
磁石２が接着剤層３を介して回転軸１に接着される。そ
の後、永久磁石２の外周面を多極着磁する。前記余剰の
接着剤３ｅは、溝１Ｕ内に溜まるから、接着剤３ｅが摺
動部Ｍに漏出することが防止される。なお、前記永久磁
石２の下端面と，前記大径部の永久磁石２側の端面（溝
１Ｕの外側の周面）との間には、空気逃げ用の間隙Ｋが
あいているから、溝１Ｕ中の空気を逃がして、接着剤３
ｅを入り込みやすくすることが出来る。以上の第３の実
施形態によれば、溝１Ｕ内に十分な分量の接着剤３ｅを
溜めることが可能なので、接着剤３ｅの漏出防止性能を
いっそう向上できる。Third Embodiment A procedure for bonding the permanent magnet 2 according to a third embodiment will be described. As shown in FIG. 4A, an adhesive 3a is applied to the outer peripheral surface of the rotating shaft 1. This rotating shaft 1 is shown in FIG.
On the protruding surface of the large diameter portion 1a from the medium diameter portion 1b of the rotating shaft 1,
A circumferential groove 1U following the middle diameter portion 1b is formed. Next, as shown in FIG. 4B, a non-magnetized permanent magnet 2 is fitted and covered, and the lower end surface of the permanent magnet 2 is projected from the small-diameter portion to the middle-diameter portion protruding surface R (the inner surface of the groove 1U). Face down) until it touches. As the permanent magnet 2 is pushed down, excess adhesive 3e protrudes from the adhesive layer 3. And FIG.
As shown in (c), when the adhesive 3a is cured, the permanent magnet 2 is bonded to the rotating shaft 1 via the adhesive layer 3. Thereafter, the outer peripheral surface of the permanent magnet 2 is multipolar magnetized. Since the surplus adhesive 3e accumulates in the groove 1U, the leakage of the adhesive 3e to the sliding portion M is prevented. Since there is a gap K for air escape between the lower end surface of the permanent magnet 2 and the end surface (the outer peripheral surface of the groove 1U) of the large-diameter portion on the permanent magnet 2 side, the groove is formed. Release the air in 1U and use adhesive 3
e can be easily entered. According to the third embodiment described above, a sufficient amount of the adhesive 3e can be stored in the groove 1U, so that the performance of preventing the adhesive 3e from leaking can be further improved.

【００３１】−第４の実施形態− 第４の実施形態にかかる永久磁石２を接着する手順につ
いて説明する。図５の（ａ）に示すように、回転軸１の
外周面に接着剤３ａを塗布する。この回転軸１は、外周
面から中径部と大径部とを含む段差付きフランジ１Ｆが
突出した構成である。次に、図５の（ｂ）に示すよう
に、無着磁の永久磁石２を嵌め被せ、永久磁石２の下端
面が段差付きフランジ１Ｆの上端面（中径部側端面）Ｔ
に当接するまで押し下げる。永久磁石２の押し下げに伴
って、接着剤層３から余剰の接着剤３ｅがはみ出す。そ
して、図５の（ｃ）に示すように、接着剤３ａが硬化す
ると、永久磁石２が接着剤層３を介して回転軸１に接着
される。その後、永久磁石２の外周面を多極着磁する。
前記接着剤３ｅは、前記永久磁石２の下端面と前記段差
付きフランジ１Ｆの下側（大径部）の突出面との間の空
間に溜まるから、接着剤３ｅが摺動部Ｍに漏出すること
が防止される。以上の第４の実施形態によれば、フラン
ジ１Ｆの厚みを大きくして永久磁石２のサイズを相対的
に小さくしなくても接着剤３ｅに対する遮蔽性能を十分
に高めることができる。Fourth Embodiment A procedure for bonding a permanent magnet 2 according to a fourth embodiment will be described. As shown in FIG. 5A, an adhesive 3a is applied to the outer peripheral surface of the rotating shaft 1. The rotating shaft 1 has a configuration in which a stepped flange 1F including a middle diameter portion and a large diameter portion protrudes from the outer peripheral surface. Next, as shown in FIG. 5 (b), the non-magnetized permanent magnet 2 is fitted and covered, and the lower end surface of the permanent magnet 2 is the upper end surface (medium diameter portion side end surface) T of the stepped flange 1F.
Press down until it touches. As the permanent magnet 2 is pushed down, excess adhesive 3e protrudes from the adhesive layer 3. Then, as shown in FIG. 5C, when the adhesive 3a is hardened, the permanent magnet 2 is bonded to the rotating shaft 1 via the adhesive layer 3. Thereafter, the outer peripheral surface of the permanent magnet 2 is multipolar magnetized.
The adhesive 3e accumulates in the space between the lower end surface of the permanent magnet 2 and the lower (large diameter) projecting surface of the stepped flange 1F, so that the adhesive 3e leaks to the sliding portion M. Is prevented. According to the fourth embodiment described above, the shielding performance against the adhesive 3e can be sufficiently improved without increasing the thickness of the flange 1F and relatively reducing the size of the permanent magnet 2.

【００３２】−第５の実施形態− 第５の実施形態にかかる永久磁石２を接着する手順につ
いて説明する。図６の（ａ）に示すように、回転軸１の
外周面に接着剤３ａを塗布する。この回転軸１は、大径
部１ａと小径部１ｃとからなり、前記小径部１ｃの前記
大径部１ａ側端部の外周面に周溝１Ｄを形成した構成で
ある。次に、図６の（ｂ）に示すように、無着磁の永久
磁石２を嵌め被せ、永久磁石２の下端面が前記小径部１
ｃからの前記大径部１ａの突出面Ｒに当接するまで押し
下げる。永久磁石２の押し下げに伴って、接着剤層３か
ら余剰の接着剤３ｅがはみ出す。そして、図６の（ｃ）
に示すように、接着剤３ａが硬化すると、永久磁石２が
接着剤層３を介して回転軸１に接着される。その後、永
久磁石２の外周面を多極着磁する。前記接着剤３ｅは、
周溝１Ｄ内に溜まるから、接着剤３ｅが摺動部Ｍに漏出
することが防止される。なお、接着を好適に行うために
は、適度の粘度（例えば６０ｃＰｓ程度の粘度）を有す
る接着剤３ａを用いることが好ましい。その理由は、粘
度が過大であると、周溝１Ｄ内から空気を逃し難くなっ
て接着剤３ｅが入り込みにくくなり、逆に、粘度が過小
であると、周溝１Ｄを通り越して接着剤３ｅが漏出しや
すくなるためである。以上の第５の実施形態によれば、
回転軸１に形成した周溝１Ｄ内に接着剤３ｅを溜めるの
で、永久磁石２の下端面と回転軸１との間に間隙が原理
的に生じず、接着剤３ｅの漏出防止の見地からいっそう
好都合である。また、周溝１Ｄ内に入り込んで硬化した
接着剤３ｅが永久磁石２の抜け防止の機能を果たすの
で、永久磁石２をいっそう強固に接着することが出来
る。Fifth Embodiment A procedure for bonding the permanent magnet 2 according to a fifth embodiment will be described. As shown in FIG. 6A, an adhesive 3a is applied to the outer peripheral surface of the rotating shaft 1. The rotary shaft 1 includes a large diameter portion 1a and a small diameter portion 1c, and has a configuration in which a circumferential groove 1D is formed on an outer peripheral surface of the small diameter portion 1c at an end on the large diameter portion 1a side. Next, as shown in FIG. 6B, a non-magnetized permanent magnet 2 is fitted and covered, and the lower end surface of the permanent magnet 2
Press down until it comes into contact with the protruding surface R of the large-diameter portion 1a from c. As the permanent magnet 2 is pushed down, excess adhesive 3e protrudes from the adhesive layer 3. And (c) of FIG.
When the adhesive 3a is hardened, the permanent magnet 2 is bonded to the rotating shaft 1 via the adhesive layer 3 as shown in FIG. Thereafter, the outer peripheral surface of the permanent magnet 2 is multipolar magnetized. The adhesive 3e is
Since the adhesive 3e accumulates in the circumferential groove 1D, the adhesive 3e is prevented from leaking to the sliding portion M. In addition, in order to perform adhesion suitably, it is preferable to use an adhesive 3a having an appropriate viscosity (for example, a viscosity of about 60 cPs). The reason is that if the viscosity is too high, it is difficult for air to escape from the inside of the circumferential groove 1D and the adhesive 3e does not easily enter. Conversely, if the viscosity is too low, the adhesive 3e passes through the circumferential groove 1D and This is because it is easy to leak. According to the fifth embodiment,
Since the adhesive 3e is stored in the circumferential groove 1D formed on the rotating shaft 1, a gap is not generated between the lower end surface of the permanent magnet 2 and the rotating shaft 1 in principle, so that the adhesive 3e is further prevented from leaking. It is convenient. Further, the adhesive 3e that has hardened by entering the circumferential groove 1D functions to prevent the permanent magnet 2 from coming off, so that the permanent magnet 2 can be more firmly bonded.

【００３３】−第６の実施形態− 第６の実施形態にかかる永久磁石２を接着する手順につ
いて説明する。図７の（ａ）に示すように、回転軸１の
外周面に接着剤３ａを塗布する。この回転軸１は、小径
部１ｃの接着面の中間部分に周溝１Ｄ’を形成した構成
である。次に、図７の（ｂ）に示すように、無着磁の永
久磁石２を嵌め被せ、永久磁石２の下端面が小径部１ｃ
からの大径部１ａの突出面Ｒに当接するまで押し下げ
る。永久磁石２の押し下げに伴って、接着剤層３からは
み出た接着剤３ｅが周溝１Ｄ’内に入り込む。永久磁石
２を押し下げる際、前記永久磁石２の下端が前記周溝１
Ｄ’上に来たら、その近傍で前記永久磁石２を軸方向に
複数回往復させれば、接着剤３ｅが周溝１Ｄ’内へ入り
込みやすくなる。そして、図７の（ｃ）に示すように、
接着剤３ａが硬化すると、永久磁石２が接着剤層３を介
して回転軸１に接着される。その後、永久磁石２の外周
面を多極着磁する。前記接着剤３ｅは、周溝１Ｄ’内に
溜まるから、接着剤３ｅが摺動部Ｍに漏出することが防
止される。以上の第６の実施形態によれば、接着面の中
間部分に周溝１Ｄ’を形成した場合にも、上記第５の実
施形態と同じ効果が得られる。Sixth Embodiment A procedure for bonding a permanent magnet 2 according to a sixth embodiment will be described. As shown in FIG. 7A, an adhesive 3a is applied to the outer peripheral surface of the rotating shaft 1. The rotating shaft 1 has a configuration in which a circumferential groove 1D 'is formed in an intermediate portion of the bonding surface of the small diameter portion 1c. Next, as shown in FIG. 7 (b), the non-magnetized permanent magnet 2 is fitted and covered, and the lower end surface of the permanent magnet 2 has a small diameter portion 1c.
Is pushed down until it comes into contact with the protruding surface R of the large-diameter portion 1a. As the permanent magnet 2 is pushed down, the adhesive 3e protruding from the adhesive layer 3 enters the circumferential groove 1D '. When the permanent magnet 2 is pushed down, the lower end of the permanent magnet 2 is
If the permanent magnet 2 reciprocates in the axial direction a plurality of times in the vicinity of D ', the adhesive 3e can easily enter the circumferential groove 1D'. Then, as shown in FIG.
When the adhesive 3a is cured, the permanent magnet 2 is bonded to the rotating shaft 1 via the adhesive layer 3. Thereafter, the outer peripheral surface of the permanent magnet 2 is multipolar magnetized. Since the adhesive 3e accumulates in the circumferential groove 1D ', the adhesive 3e is prevented from leaking to the sliding portion M. According to the above-described sixth embodiment, the same effects as in the fifth embodiment can be obtained even when the circumferential groove 1D ′ is formed in the middle part of the bonding surface.

【００３４】−第７の実施形態− 第７の実施形態にかかる永久磁石２を接着する手順につ
いて説明する。図８の（ａ）に示すように、回転軸１の
外周面に接着剤３ａを塗布する。この回転軸１は、大径
部１ａと小径部１ｃとからなり、前記小径部１ｃには軸
方向に複数の凹条１Ｊが刻設されている。次に、図８の
（ｂ）に示すように、無着磁の永久磁石２を回転させな
がら嵌め被せ、永久磁石２の下端面が前記小径部１ｃか
らの前記大径部１ａの突出面Ｒに当接するまで押し下げ
る。永久磁石２の押し下げに伴って、接着剤層３からは
み出た接着剤３ｅが、凹条１Ｊ内に入り込む。そして、
図８の（ｃ）に示すように、接着剤３ａが硬化すると、
永久磁石２が接着剤層３を介して回転軸１に接着され
る。その後、永久磁石２の外周面を多極着磁する。前記
接着剤３ｅは、凹条１Ｊ内に溜まるから、接着剤３ｅが
摺動部Ｍに漏出することが防止される。以上の第７の実
施形態によれば、凹条１Ｊ内に入り込んで硬化した接着
剤３ｅが永久磁石２のスリップを防止する機能を果たす
ので、永久磁石２をいっそう強固に接着することが出来
る。Seventh Embodiment A procedure for bonding the permanent magnet 2 according to a seventh embodiment will be described. As shown in FIG. 8A, an adhesive 3a is applied to the outer peripheral surface of the rotating shaft 1. The rotating shaft 1 includes a large-diameter portion 1a and a small-diameter portion 1c, and the small-diameter portion 1c is provided with a plurality of recesses 1J in the axial direction. Next, as shown in FIG. 8 (b), the non-magnetized permanent magnet 2 is fitted while rotating, and the lower end surface of the permanent magnet 2 has a projecting surface R of the large diameter portion 1a from the small diameter portion 1c. Press down until it touches. As the permanent magnet 2 is depressed, the adhesive 3e protruding from the adhesive layer 3 enters the groove 1J. And
As shown in FIG. 8C, when the adhesive 3a is cured,
The permanent magnet 2 is adhered to the rotating shaft 1 via the adhesive layer 3. Thereafter, the outer peripheral surface of the permanent magnet 2 is multipolar magnetized. Since the adhesive 3e accumulates in the recess 1J, the adhesive 3e is prevented from leaking to the sliding portion M. According to the seventh embodiment, the adhesive 3e that has hardened by entering into the concave stripes 1J has a function of preventing the slip of the permanent magnet 2, so that the permanent magnet 2 can be more firmly bonded.

【００３５】−第８の実施形態− 図９の（ａ）に示すように、回転軸１の外周面に接着剤
３ａを塗布する。永久磁石２の下端の内周面には、切欠
き２Ａが形成されている。次に、図９の（ｂ）に示すよ
うに、無着磁の永久磁石２を嵌め被せ、永久磁石２の下
端面が小径部１ｃからの大径部１ａの突出面Ｒに当接す
るまで押し下げる。永久磁石２の押し下げに伴って、接
着剤層３からはみ出た接着剤３ｅが切欠き２Ａ内に入り
込む。そして、図９の（ｃ）に示すように、接着剤３ａ
が硬化すると、永久磁石２が接着剤層３を介して回転軸
１に接着される。その後、永久磁石２の外周面を多極着
磁する。前記接着剤３ｅは前記切欠き２Ａ内に溜まるか
ら、接着剤３ｅが摺動部Ｍに漏出することが防止され
る。以上の第８の実施形態によれば、永久磁石２の内周
に形成した切欠き２Ａ内に接着剤３ｅを溜めるので、回
転軸１に間隙を形成するための段差や溝などを設ける必
要がなくなり、回転軸１の構造が簡単となる。Eighth Embodiment As shown in FIG. 9A, an adhesive 3a is applied to the outer peripheral surface of the rotating shaft 1. A notch 2 </ b> A is formed on the inner peripheral surface at the lower end of the permanent magnet 2. Next, as shown in FIG. 9B, the non-magnetized permanent magnet 2 is fitted and covered, and pressed down until the lower end surface of the permanent magnet 2 comes into contact with the protruding surface R of the large diameter portion 1a from the small diameter portion 1c. . As the permanent magnet 2 is pushed down, the adhesive 3e protruding from the adhesive layer 3 enters the notch 2A. Then, as shown in FIG. 9C, the adhesive 3a
Is cured, the permanent magnet 2 is bonded to the rotating shaft 1 via the adhesive layer 3. Thereafter, the outer peripheral surface of the permanent magnet 2 is multipolar magnetized. Since the adhesive 3e accumulates in the notch 2A, the adhesive 3e is prevented from leaking to the sliding portion M. According to the eighth embodiment described above, the adhesive 3e is stored in the notch 2A formed in the inner periphery of the permanent magnet 2, so that it is necessary to provide a step or a groove for forming a gap in the rotating shaft 1. And the structure of the rotating shaft 1 is simplified.

【００３６】上記第１〜第３および第５〜第８の実施形
態によれば、回転軸１にフランジを突出させないので、
永久磁石２のサイズを相対的に大きくすることが可能と
なり、トルクリミッタの小型化，高トルク化の見地から
有利である。According to the first to third and fifth to eighth embodiments, the flange is not projected from the rotating shaft 1, so that
The size of the permanent magnet 2 can be relatively increased, which is advantageous from the viewpoint of reducing the size of the torque limiter and increasing the torque.

【００３７】なお、以上の第１の実施形態〜第８の実施
形態にかかる構成を適宜組合わせてもよい。例えば、上
記第１の実施形態にかかる回転軸１の段差と、上記第６
の実施形態にかかる周溝Ｄ’の両方を具備した回転軸を
使用すれば、余剰の接着剤３ｅの溜め容量を増やして、
漏出防止性能を更にいっそう向上できる。The configurations according to the first to eighth embodiments described above may be appropriately combined. For example, the step of the rotating shaft 1 according to the first embodiment and the sixth step
If the rotary shaft having both the circumferential grooves D ′ according to the embodiment is used, the storage capacity of the surplus adhesive 3e can be increased,
The leakage prevention performance can be further improved.

【００３８】−第９の実施形態− 図１０は、本発明の第９の実施形態にかかる同軸円筒型
トルクリミッタ９０を用いた給紙装置の重送防止用リバ
ースローラを示す端面図である。この同軸円筒型トルク
リミッタ９０において、金属製シャフトＳの周りには、
回転軸１が嵌合されている。前記回転軸１の外周面に
は、円筒状の半硬質磁性体５が固着される。回転筒４の
内周面には、接着剤層３を介して永久磁石２が接着され
ている。すなわち、回転筒４の下部の内周面は、肉厚を
変えることで段差が付けられており、前記段差の上端面
に前記永久磁石２の下端面を当接させて当該永久磁石２
を接着し、前記永久磁石２の下端面と，前記段差の下側
面との間に形成される隙間に、余剰の接着剤３ｅが溜め
られている。以上の第９の実施形態によれば、回転筒４
に永久磁石２を接着するタイプの同軸円筒型トルクリミ
ッタ９０でも、隙間に余剰の接着剤３ｅを溜めて、接着
剤３ｅが永久磁石２と半硬質磁性体５とのギャップや摺
動部Ｍなどに漏出することを防止できる。Ninth Embodiment FIG. 10 is an end view showing a double feed prevention reverse roller of a paper feeder using a coaxial cylindrical torque limiter 90 according to a ninth embodiment of the present invention. In this coaxial cylindrical torque limiter 90, around the metal shaft S,
The rotating shaft 1 is fitted. A cylindrical semi-hard magnetic body 5 is fixed to the outer peripheral surface of the rotating shaft 1. The permanent magnet 2 is adhered to the inner peripheral surface of the rotary cylinder 4 via an adhesive layer 3. That is, the inner peripheral surface of the lower part of the rotary cylinder 4 is provided with a step by changing the wall thickness, and the lower end surface of the permanent magnet 2 is brought into contact with the upper end surface of the step to form the permanent magnet 2.
And an excess adhesive 3e is stored in a gap formed between the lower end surface of the permanent magnet 2 and the lower surface of the step. According to the ninth embodiment, the rotary cylinder 4
In the coaxial cylindrical torque limiter 90 of the type in which the permanent magnet 2 is adhered to the gap, the excess adhesive 3e is accumulated in the gap, and the adhesive 3e is used for the gap between the permanent magnet 2 and the semi-hard magnetic body 5, the sliding portion M, etc. Leakage can be prevented.

【００３９】[0039]

【発明の効果】本発明の同軸円筒型トルクリミッタによ
れば、永久磁石を接着する回転軸や回転筒，あるいは永
久磁石に、段差を付けたり，溝を刻設したり，切欠きを
設けたりして隙間を形成し、その隙間に余剰の接着剤を
溜めるので、接着面外に接着剤が漏出して、摺動性や回
転特性に悪影響を与えることを防止できる。また、本発
明の同軸円筒型トルクリミッタの製造方法によれば、永
久磁石を回転軸の外周面に嵌め合わせる際、永久磁石を
軸方向に往復させたり，回転させるので、回転軸に形成
された周溝や凹条に余剰の接着剤を好適に入り込ませる
ことができ、接着剤の漏出防止性能をいっそう高めるこ
とが出来る。According to the coaxial cylindrical torque limiter of the present invention, a step is formed, a groove is formed, or a notch is formed in a rotating shaft or a rotating cylinder to which a permanent magnet is bonded, or a permanent magnet. Thus, a gap is formed, and excess adhesive is accumulated in the gap, so that it is possible to prevent the adhesive from leaking out of the bonding surface and adversely affecting the slidability and the rotation characteristics. According to the method of manufacturing a coaxial cylindrical torque limiter of the present invention, when the permanent magnet is fitted to the outer peripheral surface of the rotating shaft, the permanent magnet is reciprocated or rotated in the axial direction. Excess adhesive can be suitably introduced into the circumferential groove or the groove, and the leakage preventing performance of the adhesive can be further enhanced.

[Brief description of the drawings]

【図１】第１の実施形態にかかる同軸円筒型トルクリミ
ッタを用いた給紙装置の重送防止用リバースローラを示
す端面図である。FIG. 1 is an end view showing a reverse roller for preventing double feed of a paper feeder using a coaxial cylindrical torque limiter according to a first embodiment;

【図２】第１の実施形態にかかる円筒状の永久磁石を回
転軸の外周面に接着する手順を示す説明図である。FIG. 2 is an explanatory diagram showing a procedure for bonding a cylindrical permanent magnet according to the first embodiment to an outer peripheral surface of a rotating shaft.

【図３】第２の実施形態にかかる円筒状の永久磁石を回
転軸の外周面に接着する手順を示す説明図である。FIG. 3 is an explanatory view showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft according to a second embodiment.

【図４】第３の実施形態にかかる円筒状の永久磁石を回
転軸の外周面に接着する手順を示す説明図である。FIG. 4 is an explanatory view showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft according to a third embodiment.

【図５】第４の実施形態にかかる円筒状の永久磁石を回
転軸の外周面に接着する手順を示す説明図である。FIG. 5 is an explanatory diagram showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft according to a fourth embodiment.

【図６】第５の実施形態にかかる円筒状の永久磁石を回
転軸の外周面に接着する手順を示す説明図である。FIG. 6 is an explanatory view showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft according to a fifth embodiment.

【図７】第６の実施形態にかかる円筒状の永久磁石を回
転軸の外周面に接着する手順を示す説明図である。FIG. 7 is an explanatory diagram showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft according to a sixth embodiment.

【図８】第７の実施形態にかかる円筒状の永久磁石を回
転軸の外周面に接着する手順を示す説明図である。FIG. 8 is an explanatory view showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft according to a seventh embodiment.

【図９】第８の実施形態にかかる円筒状の永久磁石を回
転軸の外周面に接着する手順を示す説明図である。FIG. 9 is an explanatory diagram showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft according to an eighth embodiment.

【図１０】第９の実施形態にかかる同軸円筒型トルクリ
ミッタを用いた給紙装置の重送防止用リバースローラを
示す端面図である。FIG. 10 is an end view showing a double feed prevention reverse roller of a sheet feeding device using a coaxial cylindrical torque limiter according to a ninth embodiment.

【図１１】従来の同軸円筒型トルクリミッタ５００を用
いた給紙装置の重送防止用リバースローラの一例を示す
端面図である。FIG. 11 is an end view showing an example of a reverse roller for preventing double feed of a paper feeder using a conventional coaxial cylindrical torque limiter 500.

【図１２】円筒状の永久磁石を回転軸の外周面に接着す
る手順を示す説明図である。FIG. 12 is an explanatory view showing a procedure for bonding a cylindrical permanent magnet to an outer peripheral surface of a rotating shaft.

[Explanation of symbols]

１０，９０同軸円筒型トルクリミッタ１，１’ 回転軸１ａ大径部１ｂ中径部１ｃ小径部１Ｆ段差付きフランジ１Ｄ，１Ｄ’ 周溝１Ｊ凹条１Ｕ溝２永久磁石２Ａ切欠き３接着剤層３ａ接着剤３ｅ余剰の接着剤４回転筒４ａ蓋体５半硬質磁性体ＡギャップＧゴムローラＭ摺動部ＰプライマーＳ金属製シャフト 10,90 Coaxial cylindrical torque limiter 1,1 'Rotating shaft 1a Large diameter portion 1b Medium diameter portion 1c Small diameter portion 1F Stepped flange 1D, 1D' Peripheral groove 1J Concave strip 1U groove 2 Permanent magnet 2A Notch 3 Adhesive layer 3a Adhesive 3e Excess Adhesive 4 Rotating Cylinder 4a Lid 5 Semi-Hard Magnetic Material A Gap G Rubber Roller M Sliding Part P Primer S Metal Shaft

Claims

[Claims]

1. A cylindrical permanent magnet (2) is adhered to an outer peripheral surface of a rotating shaft (1) or an inner peripheral surface of a rotating cylinder (4), and an outer peripheral surface of the rotating shaft or an inner peripheral surface of the rotating cylinder. A cylindrical semi-hard magnetic material (5) to which the permanent magnet is not bonded;
The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body are opposed to each other with a gap therebetween and can be relatively rotated. A coaxial cylindrical torque limiter that transmits rotation between the rotating shaft and the rotating cylinder by a hysteresis torque generated between the hard magnetic body and a rotating shaft (or a rotating cylinder) to which the permanent magnet is bonded.
A coaxial cylindrical torque limiter, wherein a gap for storing excess adhesive (3e) is formed.

2. A cylindrical permanent magnet (2) is adhered to the outer peripheral surface of the rotating shaft (1) or the inner peripheral surface of the rotating cylinder (4), and the outer peripheral surface of the rotating shaft or the inner peripheral surface of the rotating cylinder is bonded. A cylindrical semi-hard magnetic material (5) to which the permanent magnet is not bonded;
The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body are opposed to each other with a gap therebetween and can be relatively rotated. A coaxial cylindrical torque limiter for transmitting rotation between the rotating shaft and the rotating cylinder by a hysteresis torque generated between the hard magnetic body and a rotating shaft (or a rotating cylinder) to which the permanent magnet is bonded,
A coaxial cylindrical torque limiter, wherein a gap is formed between the permanent magnet and the magnet to store excess adhesive (3e).

3. A cylindrical permanent magnet (2) is adhered to an outer peripheral surface of a rotating shaft (1), and a cylindrical semi-hard magnetic body (5) is fixed to an inner peripheral surface of a rotating cylinder (4). The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body face each other with a gap therebetween and can relatively rotate, and the permanent magnet and the semi-hard magnetic body are A coaxial cylindrical torque limiter for transmitting rotation between the rotary shaft and the rotary cylinder by a hysteresis torque generated between the rotary shaft and the rotary cylinder, wherein the rotary shaft has a large diameter portion (1a) also serving as a sliding portion (M).
And a small-diameter portion (1c) on which an adhesive surface of the permanent magnet is formed.
And a middle diameter part (1b) formed between the large diameter part and the small diameter part and providing a step between them, and a protruding surface (R) of the medium diameter part from the small diameter part. , One end surface of the permanent magnet is brought into contact with the permanent magnet, and the permanent magnet is adhered. An excess adhesive (3e) is provided between the one end surface of the permanent magnet and the projecting surface of the large diameter portion from the middle diameter portion. A coaxial cylindrical torque limiter characterized by forming a gap for storing the torque limiter.

4. A cylindrical permanent magnet (2) is adhered to an outer peripheral surface of a rotating shaft (1), and a cylindrical semi-hard magnetic body (5) is fixed to an inner peripheral surface of a rotating cylinder (4). The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body face each other with a gap therebetween and can relatively rotate, and the permanent magnet and the semi-hard magnetic body are A coaxial cylindrical torque limiter for transmitting rotation between the rotary shaft and the rotary cylinder by a hysteresis torque generated between the rotary shaft and the rotary cylinder, wherein the rotary shaft has a large diameter portion (1a) also serving as a sliding portion (M).
And a small-diameter portion (1c) on which an adhesive surface of the permanent magnet is formed.
And a middle diameter portion (1b) formed between the large diameter portion and the small diameter portion and providing a step between the two. The projecting surface of the large diameter portion from the middle diameter portion has A circumferential groove (1u) following the middle diameter portion is engraved, and one end surface of the permanent magnet is brought into contact with a protruding surface (R) of the middle diameter portion from the small diameter portion to bond the permanent magnet. A coaxial cylindrical torque limiter wherein excess adhesive (3e) is stored in the groove.

5. A cylindrical permanent magnet (2) is adhered to an outer peripheral surface of a rotating shaft (1), and a cylindrical semi-hard magnetic body (5) is fixed to an inner peripheral surface of a rotating cylinder (4). The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body face each other with a gap therebetween and can relatively rotate, and the permanent magnet and the semi-hard magnetic body are A coaxial cylindrical torque limiter that transmits rotation between the rotary shaft and the rotary cylinder by a hysteresis torque generated between the rotary shaft and the rotary cylinder, wherein a stepped flange including a middle diameter portion and a large diameter portion from an outer peripheral surface of the rotary shaft. (1F) protrudes, the one end surface of the permanent magnet is brought into contact with the middle diameter side end surface (T) of the stepped flange, and the permanent magnet is adhered, and the one end surface of the permanent magnet and the stepped flange are joined. Surplus contact between the middle diameter portion and the projecting surface of the large diameter portion. Coaxial cylindrical torque limiter, characterized in that the formation of the gap for storing agent (3e).

6. A cylindrical permanent magnet (2) is adhered to an outer peripheral surface of a rotating shaft (1), and a cylindrical semi-hard magnetic body (5) is fixed to an inner peripheral surface of a rotating cylinder (4). The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body face each other with a gap therebetween and can relatively rotate, and the permanent magnet and the semi-hard magnetic body are A coaxial cylindrical torque limiter for transmitting rotation between the rotary shaft and the rotary cylinder by a hysteresis torque generated between the rotary shaft and the rotary cylinder, wherein the rotary shaft has a large diameter portion (1a) also serving as a sliding portion (M).
And a small-diameter portion (1c) on which an adhesive surface of the permanent magnet is formed.
A circumferential groove (1D) is formed on the outer peripheral surface of the large-diameter portion side end of the small-diameter portion, and one end surface of the permanent magnet is formed on the protruding surface (R) of the large-diameter portion from the small-diameter portion. A coaxial cylindrical torque limiter, wherein the permanent magnet is brought into contact with the permanent magnet and the excess adhesive (3e) is accumulated in the circumferential groove.

7. A cylindrical permanent magnet (2) is adhered to an outer peripheral surface of a rotating shaft (1), and a cylindrical semi-hard magnetic body (5) is fixed to an inner peripheral surface of a rotating cylinder (4). The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body face each other with a gap therebetween and can relatively rotate, and the permanent magnet and the semi-hard magnetic body are A coaxial cylindrical torque limiter for transmitting rotation between the rotary shaft and the rotary cylinder by a hysteresis torque generated between the rotary shaft and the rotary cylinder, wherein the rotary shaft has a large diameter portion (1a) also serving as a sliding portion (M).
And a small-diameter portion (1c) on which an adhesive surface of the permanent magnet is formed.
A peripheral groove (1D ′) is formed at an intermediate portion of the bonding surface, and one end surface of the permanent magnet is brought into contact with a protruding surface (R) of the large diameter portion from the small diameter portion to make the permanent magnet A coaxial cylindrical torque limiter, wherein a magnet is adhered and excess adhesive (3e) is accumulated in the circumferential groove.

8. A cylindrical permanent magnet (2) is adhered to the outer peripheral surface of the rotating shaft (1), and a cylindrical semi-hard magnetic body (5) is fixed to the inner peripheral surface of the rotating cylinder (4). The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body face each other with a gap therebetween and can relatively rotate, and the permanent magnet and the semi-hard magnetic body are A coaxial cylindrical torque limiter for transmitting rotation between the rotary shaft and the rotary cylinder by a hysteresis torque generated between the rotary shaft and the rotary cylinder, wherein the rotary shaft has a large diameter portion (1a) also serving as a sliding portion (M).
And a small-diameter portion (1c) on which an adhesive surface of the permanent magnet is formed.
One or more concave streaks (1J) are engraved on the outer peripheral surface of the rotating shaft in the axial direction, and one end surface of the permanent magnet is formed on a protruding surface (R) of the large diameter portion from the small diameter portion. Are brought into contact with each other to adhere the permanent magnet, and the excess adhesive (3e)
A coaxial cylindrical torque limiter characterized by accumulating energy.

9. A cylindrical permanent magnet (2) is adhered to the outer peripheral surface of the rotating shaft (1), and a cylindrical semi-hard magnetic body (5) is fixed to the inner peripheral surface of the rotating cylinder (4). The rotating shaft and the rotating cylinder are arranged coaxially so that the permanent magnet and the semi-hard magnetic body face each other with a gap therebetween and can relatively rotate, and the permanent magnet and the semi-hard magnetic body are A coaxial cylindrical torque limiter for transmitting rotation between the rotary shaft and the rotary cylinder by a hysteresis torque generated between the rotary shaft and the rotary cylinder, wherein the rotary shaft has a large diameter portion (1a) also serving as a sliding portion (M).
And a small-diameter portion (1c) on which an adhesive surface of the permanent magnet is formed.
And a notch (2) in the inner peripheral surface at one end of the permanent magnet.
A) is formed, one end surface of the permanent magnet is brought into contact with the protruding surface (R) of the large diameter portion from the small diameter portion, and the permanent magnet is adhered, and the excess adhesive ( 3e) A coaxial cylindrical torque limiter characterized by storing:

10. A cylindrical permanent magnet (2) is adhered to an inner peripheral surface of a rotary cylinder (4), and a cylindrical semi-hard magnetic body (5) is fixed to an outer peripheral surface of a rotary shaft (1). The rotating cylinder and the rotating shaft are coaxially arranged so that the permanent magnet and the semi-hard magnetic body face each other with a gap therebetween and can relatively rotate, and the permanent magnet and the semi-hard magnetic body are A coaxial cylindrical torque limiter that transmits rotation between the rotating shaft and the rotating cylinder by a hysteresis torque generated between the rotating shaft and the rotating cylinder, wherein a step is formed on an inner peripheral surface by changing a thickness of the rotating cylinder, and the step is formed. One end surface of the permanent magnet is brought into contact with the upper surface of the permanent magnet to bond the permanent magnet, and a gap is formed between the one end surface of the permanent magnet and the lower surface of the step to accumulate excess adhesive (3e). A coaxial cylindrical torque limiter characterized by being formed.

11. The method for manufacturing a coaxial cylindrical torque limiter according to claim 7, wherein one end of the permanent magnet is directly above the circumferential groove or when the permanent magnet is fitted over the outer peripheral surface of the rotating shaft. A method of manufacturing a coaxial cylindrical torque limiter, comprising: reciprocating the permanent magnet a plurality of times in an axial direction when the permanent magnet comes near the torque limiter.

12. The method of manufacturing a coaxial cylindrical torque limiter according to claim 8, wherein the permanent magnet is rotated while being fitted over an outer peripheral surface of the rotary shaft. Method.