JP2008151232A

JP2008151232A - Reverse input cut-off unit with torque limiter

Info

Publication number: JP2008151232A
Application number: JP2006338688A
Authority: JP
Inventors: Seiichi Takada; 声一高田
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2006-12-15
Filing date: 2006-12-15
Publication date: 2008-07-03

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a reverse input cut-off unit having an input rotary member and an output rotary member relatively rotatably fitted on a fixing member, having a both-direction lock type roller clutch intervened on a fitting section of the fixing member and the output rotary member, and having both end parts of a roller holding pocket of the clutch divided by a retainer engaged with the input rotary member, and to avoid influence on an input side by idle running when reverse input of fixed torque or higher is applied. <P>SOLUTION: The fixing member in the reverse input cut-off unit comprises a fixed shaft 21, both of the input rotary member and the output rotary member comprise an output gear 23 and an input gear 22 rotatably fitted on the fixed shaft 21, the roller clutch 28 is built in the output gear 23, and a both direction torque limiter 51 is put between the output gear 23 and a roller clutch 28. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、事務機の給紙機構等において使用されるトルクリミッタ付き逆入力遮断ユニットに関するものである。 The present invention relates to a reverse input blocking unit with a torque limiter used in a paper feeding mechanism of an office machine.

逆入力遮断ユニットは、入力側から出力側へのトルクの伝達は可能であるが、その逆方向のトルクの伝達を遮断することによって、入力側に結合された駆動源に出力側（負荷側）から逆入力されるトルクの影響が及ぶことを回避するようにしたものである。 The reverse input cutoff unit can transmit torque from the input side to the output side, but by blocking the transmission of torque in the reverse direction, the drive source coupled to the input side is connected to the output side (load side) Thus, it is possible to avoid the influence of the torque input in reverse from.

このような逆入力遮断ユニットとして知られている従来の構造は、一般に、図９（a）から（ｃ）に示したように、円筒状の固定部材１の内径側に入力回転部材２と出力回転部材３が相対回転可能に同軸状態に径方向に重ねて嵌合され、前記固定部材１の内径両端部において軸受４、４を介して出力回転部材３が回転自在に支持される。前記固定部材１と出力回転部材３との径方向の嵌合部分に両方向ロック型のころ式クラッチ５が介在される。 A conventional structure known as such a reverse input blocking unit generally has an input rotating member 2 and an output on the inner diameter side of a cylindrical fixing member 1 as shown in FIGS. 9 (a) to 9 (c). The rotating member 3 is fitted in a coaxial state so as to be rotatable relative to each other in the radial direction, and the output rotating member 3 is rotatably supported through bearings 4 and 4 at both inner diameter ends of the fixed member 1. A two-way lock type roller clutch 5 is interposed in a radial fitting portion between the fixed member 1 and the output rotating member 3.

このクラッチ５は、固定部材１の内径面と出力回転部材３に形成されたカム面６及び保持器７の２本のアーム８とによって囲まれたころ収納ポケット９が形成される。各ポケットに一対のころ１０が収納されるとともに、各ころ１０間に付勢ばね１１が介在され、各ころ１０がポケット９の左右の狭小方向に離反する方向に付勢される。 The clutch 5 has a roller storage pocket 9 surrounded by an inner diameter surface of the fixed member 1, a cam surface 6 formed on the output rotating member 3, and two arms 8 of the cage 7. A pair of rollers 10 is housed in each pocket, and a biasing spring 11 is interposed between the rollers 10 so that each roller 10 is biased in a direction away from the left and right narrow directions of the pocket 9.

前記入力回転部材２と出力回転部材３にこれらの径方向にピン１２が貫通され、そのピン１２に前記クラッチ５の保持器７が係合される。該ピン１２は、出力回転部材３に対しては回転方向に伝達遅れすき間ａをもって貫通する。前記入力回転部材２に入力軸、出力回転部材３に出力軸をそれぞれ差し込んで使用に供される。 A pin 12 is passed through the input rotating member 2 and the output rotating member 3 in the radial direction, and the retainer 7 of the clutch 5 is engaged with the pin 12. The pin 12 penetrates the output rotation member 3 with a transmission delay gap a in the rotation direction. An input shaft is inserted into the input rotating member 2 and an output shaft is inserted into the output rotating member 3 for use.

前記入力回転部材２からの入力トルクによって保持器７が何れか一方向に回転されると、一方のころ８がポケット９の内側に移動してロックが解除され、さらにその保持器７の回転に時間遅れをもって回転する出力回転部材３の回転によって他方のころ１０のロックも解除される。両方のころ１０のロックが解除されることによりクラッチ５がフリーとなってトルクの伝達が行われる。逆に、出力回転部材３からの逆入力トルクは、いずれの回転方向であってもクラッチ５において一つのころ１０がロックされるので入力回転部材２への伝達が遮断される（特許文献１）。 When the cage 7 is rotated in any one direction by the input torque from the input rotating member 2, one roller 8 is moved to the inside of the pocket 9 to be unlocked, and the cage 7 is further rotated. The lock of the other roller 10 is also released by the rotation of the output rotating member 3 that rotates with a time delay. By releasing the lock of both rollers 10, the clutch 5 becomes free and torque is transmitted. Conversely, the reverse input torque from the output rotating member 3 is blocked from being transmitted to the input rotating member 2 because one roller 10 is locked in the clutch 5 in any rotation direction (Patent Document 1). .

前記の伝達遅れすき間ａを設けているのは、ころ１０のロック解除と、出力回転部材３の回転開始との間に時間遅れを持たせることにより、確実にロックを解除したのちに出力回転部材３の回転を開始させるようにするためである。しかし、保持器７のアーム８ところ１０との間の遊びの大きさ、カム面６によって形成されるクサビ角の大きさ、付勢ばね１１のばね力の大きさの如何等によっては前記すき間aが実質的にゼロである場合もあり得る。
特開平２−２７１１１６号公報（第１の実施例、第１図から第３図） The transmission delay gap a is provided by providing a time delay between the unlocking of the roller 10 and the start of rotation of the output rotating member 3, so that the output rotating member can be released after the lock is reliably released. This is to start the rotation of No. 3. However, the clearance a depends on the amount of play between the arms 8 and 10 of the cage 7, the size of the wedge angle formed by the cam surface 6, the size of the spring force of the urging spring 11, and the like. Can be substantially zero.
JP-A-2-271116 (first embodiment, FIGS. 1 to 3)

前述した従来の逆入力遮断ユニットは、固定部材１が環状部材乃至円筒部材によって形成され、その固定部材１の内部に入力回転部材２、出力回転部材３、両方向ロック型のころ式クラッチ５等を組み込んだ構成であるので、これを事務機等に取付ける場合は、固定部材１をフレームに固定するためのスペースや、ハウジングが必要となり、このクラッチを使用する装置内部の省スペース化を妨げる問題がある。 In the conventional reverse input blocking unit described above, the fixing member 1 is formed of an annular member or a cylindrical member, and the input rotating member 2, the output rotating member 3, the two-way lock type roller clutch 5 and the like are provided inside the fixing member 1. Since it is a built-in configuration, when it is attached to an office machine or the like, a space for fixing the fixing member 1 to the frame and a housing are required, and there is a problem that hinders space saving inside the device using this clutch. is there.

また、逆入力トルクの入力側への遮断は、ころ式クラッチ５がロックすることにより遮断するようになっているので、クラッチ５に対して過負荷が掛かる場合がありクラッチ５の早期摩耗の原因となる問題がある。また、ロックによって逆入力トルクの伝達を遮断するのは、却って不便な場合がある。例えば、このユニットが紙送り機構に使用された場合において、紙送りローラに詰まった紙を取り除く際には紙送りローラが逆回転できることが円滑に取り除くために必要である。しかし、従来のユニットの場合は、紙送りローラが逆回転できないので、給紙機構への使用に制限を受ける場合がある。 Further, since the reverse input torque is shut off to the input side when the roller clutch 5 is locked, the clutch 5 may be overloaded, which causes premature wear of the clutch 5. There is a problem. Also, it may be inconvenient to cut off the transmission of reverse input torque by locking. For example, when this unit is used in a paper feed mechanism, it is necessary to smoothly remove the paper feed roller so that the paper feed roller can rotate backward when removing paper jammed in the paper feed roller. However, in the case of the conventional unit, since the paper feed roller cannot be rotated in reverse, there are cases where the use of the paper feed roller is limited.

そこで、この発明は、径方向のサイズの縮小化を図りコンパクトな構造をもった逆入力遮断ユニットを提供すること、及び一定以上の大きさの逆入力トルクは空転することによって入力側へのトルク伝達が遮断できるようにしたトルクリミッタ付き逆入力遮断ユニットを提供することを課題とする。 Therefore, the present invention provides a reverse input blocking unit having a compact structure by reducing the size in the radial direction, and the reverse input torque of a certain magnitude or more is idling to cause torque to the input side. It is an object of the present invention to provide a reverse input blocking unit with a torque limiter capable of blocking transmission.

前記の課題を解決するために、この発明は、図１及び図２（ａ）（ｂ）に示したように、固定部材２１に対し入力回転部材２２と出力回転部材２３が相対回転可能に嵌合され、前記固定部材２１と出力回転部材２３との嵌合部分に両方向ロック型のころ式クラッチ２８が介在され、前記クラッチ２８のころ収納ポケット４２の両端部が前記入力回転部材２２に係合された保持器３１によって区画され、前記ポケット４２に一対のころ３２が該ポケット４２の狭小方向に相互に離反する方向に付勢されて収納され、前記入力回転部材２２からの入力トルクにより回転される前記保持器３１によって一方のころ３２のロックが解除されてトルクの伝達が行われ、一方、前記出力回転部材２３からの逆入力トルクによってポケット４２内のいずれか一方のころ３２がロックして入力回転部材２２へのトルクの伝達が遮断されるようにした逆入力遮断ユニットを前提とする。 In order to solve the above-mentioned problems, the present invention is configured such that the input rotating member 22 and the output rotating member 23 are fitted to the fixed member 21 so as to be relatively rotatable as shown in FIGS. 1 and 2A and 2B. A two-way lock type roller clutch 28 is interposed at a fitting portion between the fixed member 21 and the output rotating member 23, and both end portions of the roller storage pocket 42 of the clutch 28 are engaged with the input rotating member 22. The pair of rollers 32 is stored in the pocket 42 while being biased in a direction away from each other in the narrow direction of the pocket 42, and rotated by the input torque from the input rotating member 22. One of the rollers 32 is unlocked by the retainer 31 and torque is transmitted. On the other hand, any one of the pockets 42 in the pocket 42 by the reverse input torque from the output rotating member 23. Square of the roller 32 to assume an inverted input blocking unit as the transmission of torque to the input rotary member 22 and the lock is blocked.

このような逆入力遮断ユニットにおいて、この発明は、前記固定部材２１が固定軸により構成され、前記入力回転部材２２と出力回転部材２３がともに該固定軸に対し回転自在に嵌合され、前記ころ式クラッチ２８が前記出力回転部材２３の内径面に組み込まれ、前記出力回転部材２３ところ式クラッチ２８との間に両方向トルクリミッタ５１が介在された構成としたものである。 In such a reverse input blocking unit, in the present invention, the fixing member 21 is constituted by a fixed shaft, and both the input rotating member 22 and the output rotating member 23 are rotatably fitted to the fixed shaft. The type clutch 28 is incorporated in the inner diameter surface of the output rotating member 23, and a bidirectional torque limiter 51 is interposed between the output rotating member 23 and the type clutch 28.

従来は固定部材が環状体乃至円筒体のものであったのに対し、この発明においては固定部材が固定軸によって構成され、その固定軸に入力回転部材２２と出力回転部材２３がともに該固定軸に対し回転自在に嵌合された構成であるから、装置に組付ける際は、固定軸を装置に固定するだけでよい。 Conventionally, the fixing member is an annular body or a cylindrical body. In the present invention, the fixing member is constituted by a fixed shaft, and the input rotating member 22 and the output rotating member 23 are both fixed to the fixed shaft. Therefore, when assembling to the apparatus, it is only necessary to fix the fixed shaft to the apparatus.

また、両方向トルクリミッタ５１を介在させたことにより、通常の入力トルクは該トルクリミッタ５１の設定トルク値以下の場合に出力側に伝達される。また、逆入力トルクが該トルクリミッタ５１の設定トルク値以下の場合は、クラッチ２８がロックしてトルクの伝達が遮断されるが、設定トルク値を越えるとトルクリミッタ５１が空転することによりトルクの伝達が遮断される。 Further, since the bidirectional torque limiter 51 is interposed, the normal input torque is transmitted to the output side when the torque limiter 51 is below the set torque value. When the reverse input torque is less than or equal to the set torque value of the torque limiter 51, the clutch 28 is locked and torque transmission is interrupted. However, when the torque exceeds the set torque value, the torque limiter 51 idles to cause torque Transmission is interrupted.

この発明は以上のようなものであるから、以下の効果を奏することができる。
（１）ころ式クラッチのロック時にころを支持する固定部材が固定軸によって構成され、その固定軸の回りに嵌合された入力回転部材と出力回転部材が軸方向に配置されるので、ユニット全体が径方向にコンパクト化される。
（２）１本の固定軸に全ての部材が組付けられユニット化されるため、ユニットの組立や、装置への組付けを容易に行うことができる。
（３）逆入力トルクのトルク値が一定以上に大きい場合、トルクリミッタが空転することにより入力側へのトルクの伝達が遮断されるので、クラッチに過負荷が作用することがなく、また紙送りローラのような出力回転部材の空転が可能となり、紙詰まりを円滑に解除することができる。 Since the present invention is as described above, the following effects can be obtained.
(1) Since the fixed member that supports the roller when the roller clutch is locked is constituted by a fixed shaft, and the input rotating member and the output rotating member fitted around the fixed shaft are arranged in the axial direction, the entire unit Is compact in the radial direction.
(2) Since all the members are assembled to one fixed shaft to form a unit, the assembly of the unit and the assembly to the apparatus can be easily performed.
(3) When the torque value of the reverse input torque is greater than a certain value, the torque limiter idles and the torque transmission to the input side is interrupted, so that the clutch is not overloaded and the paper feed The idling of the output rotating member such as a roller can be performed, and the paper jam can be smoothly released.

以下、添付図面に基づき実施例を説明する。 Embodiments will be described below with reference to the accompanying drawings.

図１から図８に示した実施例の逆入力遮断ユニットは、特許請求の範囲でいう「固定部材」が固定軸２１、「入力回転部材」が入力歯車２２、「出力回転部材」が出力歯車２３となっている。 In the reverse input blocking unit of the embodiment shown in FIGS. 1 to 8, the “fixing member” in the claims is the fixed shaft 21, the “input rotation member” is the input gear 22, and the “output rotation member” is the output gear. 23.

前記の固定軸２１に対し、入力歯車２２と出力歯車２３が軸方向に接近して回転自在に嵌合される。各歯車２２、２３はそれぞれ止め輪２４、２５によって軸方向に位置決めされる。入力歯車２２は出力歯車２３との対向面において軸穴の両側に係合凹部２６（図４（ａ）参照）が設けられる。 An input gear 22 and an output gear 23 are fitted to the fixed shaft 21 so as to be rotatable in the axial direction. Each gear 22 and 23 is positioned in the axial direction by retaining rings 24 and 25, respectively. The input gear 22 is provided with engaging recesses 26 (see FIG. 4A) on both sides of the shaft hole on the surface facing the output gear 23.

出力歯車２３は、入力歯車２２との対向面に固定軸２１と同芯の収納凹部２７が設けられ、その収納凹部２７の内径部に両方向ロック型のころ式クラッチ２８が組み込まれる。 The output gear 23 is provided with a housing recess 27 concentric with the fixed shaft 21 on the surface facing the input gear 22, and a bidirectional lock type roller clutch 28 is incorporated in the inner diameter portion of the housing recess 27.

このクラッチ２８は、外輪２９、保持器３１、ころ３２及び付勢ばね３３によって構成される（図３参照）。外輪２９の内径面には周方向に一定の間隔をおいて円弧部３５（図２（ａ）参照）が４個所に形成されるとともに、各円弧部３５の両端に平坦なカム面３６が形成される。隣接する円弧部３５間の２個所のカム面３６相互は、一定の角度をもって山形に突き合う（図２（ａ）（ｂ）参照）。 The clutch 28 includes an outer ring 29, a cage 31, rollers 32, and an urging spring 33 (see FIG. 3). Arc portions 35 (see FIG. 2A) are formed at four locations on the inner diameter surface of the outer ring 29 at regular intervals in the circumferential direction, and flat cam surfaces 36 are formed at both ends of each arc portion 35. Is done. Two cam surfaces 36 between the adjacent arc portions 35 face each other in a mountain shape with a certain angle (see FIGS. 2A and 2B).

前記の保持器３１は、入力歯車２２と同一内径を有し、その外径は図３及び図４（ｂ）に示したように入力歯車２２側が小径部３７、出力歯車２３側が大径部３８となっている。小径部３７の端面に軸方向に突き出した一対の係合片３９が設けられる。各係合片３９は、入力歯車２２の前記の係合凹部２６に嵌合され、これにより入力歯車２２と保持器３１が一体化される。また、大径部３８の端面に周方向に一定間隔をおいてアーム４１が軸方向に突き出して設けられる。各アーム４１は、前述の隣接した円弧部３５間の２個所のカム面３６相互が突き合った部分の内側に配置される。 The retainer 31 has the same inner diameter as that of the input gear 22, and the outer diameter of the cage 31 is as shown in FIGS. 3 and 4B, the input gear 22 side being the small diameter portion 37, and the output gear 23 side being the large diameter portion 38. It has become. A pair of engagement pieces 39 protruding in the axial direction is provided on the end face of the small diameter portion 37. Each engagement piece 39 is fitted into the engagement recess 26 of the input gear 22, whereby the input gear 22 and the cage 31 are integrated. Further, an arm 41 is provided on the end face of the large diameter portion 38 so as to protrude in the axial direction at a constant interval in the circumferential direction. Each arm 41 is disposed inside a portion where the two cam surfaces 36 abut each other between the aforementioned adjacent arc portions 35.

前記円弧部３５、その両側のカム面３６、これらの部分に対向した固定軸２１の外径面とによって囲まれた部分の回転方向の両側が前記保持器３１の一対のアーム４１によって区画され、これによってころ３２の収納のためのポケット４２が形成される。各ポケット４２に一対のころ３２が収納されるとともに、各ころ３２間に板ばねをＳの字形に屈曲して形成された付勢ばね３３が介在される。 Both sides in the rotational direction of the portion surrounded by the arc portion 35, the cam surfaces 36 on both sides thereof, and the outer diameter surface of the fixed shaft 21 facing these portions are partitioned by a pair of arms 41 of the cage 31, As a result, a pocket 42 for storing the roller 32 is formed. A pair of rollers 32 is accommodated in each pocket 42, and an urging spring 33 formed by bending a leaf spring into an S shape is interposed between the rollers 32.

前記のポケット４２は、回転方向の両端部に各カム面３６と固定軸２１とによって狭小部が形成され、その狭小部に接触したころ３２が固定軸２１と接する点における接線とカム面３６とがなす角をクサビ角θと称する（図２（ｂ）参照）。クサビ角θは各ポケット４２ごとに２個所対称形に形成される。 The pocket 42 is formed with a narrow portion at each end in the rotational direction by the cam surfaces 36 and the fixed shaft 21, and a tangent line at the point where the roller 32 contacting the narrow portion contacts the fixed shaft 21 and the cam surface 36. Is defined as a wedge angle θ (see FIG. 2B). The wedge angle θ is formed symmetrically at two locations for each pocket 42.

前記ポケット４２は内径側に開放されているので、固定軸２１に組付けられる前においてはころ３２が内径側に落下することがあり取扱性が悪い。これを防止すべく、ポケット４２の開放面にころ受け片４３が設けられる。ころ受け片４３は、図１及び図３に示したように、出力歯車２３の閉塞側の軸穴４４の周りにおいて、周方向に前記のポケット４２に対応した間隔をおき内向きに突き出して設けられる。ころ受け片４３は、断面形状が台形をなし（図２（ｂ）参照）、その左右両側において両側のアーム４１との間でそれぞれころ３２を受ける。また付勢ばね３３が該ころ受け片４３によって内径側から支持される。 Since the pocket 42 is opened to the inner diameter side, the roller 32 may drop to the inner diameter side before being assembled to the fixed shaft 21, so that the handleability is poor. In order to prevent this, a roller receiving piece 43 is provided on the open surface of the pocket 42. As shown in FIGS. 1 and 3, the roller receiving piece 43 is provided around the shaft hole 44 on the closing side of the output gear 23 so as to protrude inward in the circumferential direction at intervals corresponding to the pockets 42. It is done. The roller receiving piece 43 has a trapezoidal cross-sectional shape (see FIG. 2B), and receives the rollers 32 between the arms 41 on both sides on both the left and right sides. The urging spring 33 is supported from the inner diameter side by the roller receiving piece 43.

前記保持器３１の大径部３８の出力歯車２３側の端面において、係合凹部４５が中心対称の２個所に設けられる（図４（ｂ）参照）。また、これに対向して前記外輪２９の入力歯車２２側の端面において、軸方向に係合凸部４６が中心対称の２個所に設けられる（図３参照）。前記の係合凹部４５と係合凸部４６は回転方向の両側に所要の伝達遅れすき間a（図４（ｃ）、図５（ａ）参照）をおいて相互に嵌合される。保持器３１と外輪２９が軸方向に相互に嵌合された状態において、保持器３１の各アーム４１は一対のカム面３６が角度をもって突き合った部分の内径側に位置する（図２（ａ）参照）。 On the end face on the output gear 23 side of the large-diameter portion 38 of the retainer 31, engagement concave portions 45 are provided at two centrally symmetric positions (see FIG. 4B). Further, on the end face on the input gear 22 side of the outer ring 29 facing this, engagement convex portions 46 are provided at two axially symmetrical positions (see FIG. 3). The engagement concave portion 45 and the engagement convex portion 46 are fitted to each other with a required transmission delay gap a (see FIGS. 4C and 5A) on both sides in the rotational direction. In a state where the cage 31 and the outer ring 29 are fitted to each other in the axial direction, each arm 41 of the cage 31 is positioned on the inner diameter side of the portion where the pair of cam surfaces 36 abut each other at an angle (FIG. 2A )reference).

前記の外輪２９の外径面と出力歯車２３の収納凹部２７の内径面によって形成される空所に外輪２９の外径面に緊縛されたコイルばね５２が収納されるとともに、その開口端を閉塞する蓋部材４７が該収納凹部２７の開放端に嵌合される。蓋部材４７は保持器３１の大径部３８の外径面に嵌合される円筒部５３と、保持器３１の大径部３８と小径部３７間の段差部に係合される内向きつば部５４を有し、その内向きつば部５４の外径面に抜け止めリブ５５が設けられる。蓋部材４７は、収納凹部２７の内径面に嵌合固定され、前記の抜け止めリブ５５によって抜け止めされる。 A coil spring 52 tightly bound to the outer diameter surface of the outer ring 29 is housed in a space formed by the outer diameter surface of the outer ring 29 and the inner diameter surface of the housing recess 27 of the output gear 23, and the opening end is closed. A lid member 47 is fitted into the open end of the storage recess 27. The lid member 47 includes a cylindrical portion 53 that is fitted to the outer diameter surface of the large diameter portion 38 of the cage 31 and an inward flange that is engaged with a step portion between the large diameter portion 38 and the small diameter portion 37 of the cage 31. A retaining rib 55 is provided on the outer diameter surface of the inward flange portion 54. The lid member 47 is fitted and fixed to the inner diameter surface of the storage recess 27 and is prevented from being detached by the retaining rib 55.

前記のコイルばね５２の線材の断面形状は四角形、円形のいずれでもよく、両端間にわたり同一径をもって密に右巻きされたものである（図３参照）。入力側端面５６及び出力側端面５７は、いずれも線材の長さ方向に対し直角に切断される。 The cross-sectional shape of the wire material of the coil spring 52 may be either square or circular, and is tightly wound with the same diameter across both ends (see FIG. 3). Both the input side end face 56 and the output side end face 57 are cut at right angles to the length direction of the wire.

前記蓋部材４７の円筒部５３の先端に、前記コイルばね５２の入力側端面５６に周方向に対向した入力側係合突起５８が軸方向に突き出して設けられる（図３参照）。また、出力歯車２３の軸穴４４が形成された閉塞端に片寄った内径面に出力側端面５７に周方向に対向した出力側係合突起５９が設けられる。 An input-side engagement protrusion 58 that is circumferentially opposed to the input-side end face 56 of the coil spring 52 is provided at the tip of the cylindrical portion 53 of the lid member 47 so as to protrude in the axial direction (see FIG. 3). Further, an output-side engagement protrusion 59 that is opposed to the output-side end surface 57 in the circumferential direction is provided on the inner diameter surface that is offset from the closed end where the shaft hole 44 of the output gear 23 is formed.

前記コイルばね５２の入力側端面５６及び出力側端面５７は、それぞれ、入力側から見て各係合突起５８、５９の右側の面に当接又は接近される（図６（a）（ｂ）参照）。コイルばね５２が外輪２９の外径面に緊縛され、さらにその両端面５６、５７がそれぞれ蓋部材４７の入力側係合突起５６及び出力歯車２３の出力側係合突起５９に当接又は接近された構造によって両方向性のトルクリミッタ５１が構成される。 The input side end face 56 and the output side end face 57 of the coil spring 52 are brought into contact with or approached to the right side surfaces of the respective engaging projections 58 and 59 when viewed from the input side (FIGS. 6A and 6B). reference). The coil spring 52 is tightly bound to the outer diameter surface of the outer ring 29, and both end surfaces 56 and 57 thereof are brought into contact with or approached to the input side engaging projection 56 of the lid member 47 and the output side engaging projection 59 of the output gear 23, respectively. The bidirectional torque limiter 51 is configured by the structure.

組立に際しては、前記の外輪２９、保持器３１、ころ３２及び付勢ばね３３によって構成されたクラッチ２８の外径面に前記のコイルばね５２を装着した状態で、ころ３２の落下を防止しながら出力歯車２３の収納凹部２７に嵌入し、ころ３２をころ受け片４３に支持させる。その後、蓋部材４７を保持器３１の大径部３８の外径面に差し込み、外輪２９と出力歯車２３の内径面との間、即ち、コイルばね５２の収納部を閉塞する。蓋部材４７を適宜回転させることにより、その入力側係合突起５８にコイルばね５２の入力側端面５６を回転方向に係合させ、さらにその回転を進めて出力側端面５７を出力側係合突起５９に係合させる。 When assembling, while the coil spring 52 is mounted on the outer diameter surface of the clutch 28 constituted by the outer ring 29, the retainer 31, the roller 32, and the biasing spring 33, the roller 32 is prevented from dropping. The roller 32 is supported by the roller receiving piece 43 by being fitted into the storage recess 27 of the output gear 23. Thereafter, the lid member 47 is inserted into the outer diameter surface of the large diameter portion 38 of the retainer 31, and the space between the outer ring 29 and the inner diameter surface of the output gear 23, that is, the accommodating portion of the coil spring 52 is closed. By appropriately rotating the lid member 47, the input side end face 56 of the coil spring 52 is engaged with the input side engaging protrusion 58 in the rotation direction, and the rotation is further advanced to make the output side end face 57 the output side engaging protrusion 57. 59 is engaged.

なお、蓋部材４７の内径面と保持器３１の外径面との間には、所要の回転すき間が形成される。 A required rotation gap is formed between the inner diameter surface of the lid member 47 and the outer diameter surface of the cage 31.

前記のように組み立てられた入力歯車２２と出力歯車２３の軸穴に固定軸２１を挿通する際は、図７に示したように、出力歯車２３を固定した状態において入力歯車２２を矢印Ａ方向に回転させる。入力歯車２２と一体の保持器３１が同方向に回転し、そのアーム４１がクラッチ２８の一方のころ３２のロックを解除する（図２（ａ）の矢印Ａ参照）。一方、固定軸２１を前記と反対の矢印Ｃ方向に回転させつつ出力歯車２３側から挿入すると、図２（a）の一点鎖線で示した矢印Ｃによって示したように、他方のころ３２のロックが解除される。これにより両方のころ３２がフリーとなるので、固定軸２１はころ３２に妨げられることなく両方の歯車２３、２２に貫通させることができる。 When the fixed shaft 21 is inserted into the shaft holes of the input gear 22 and the output gear 23 assembled as described above, the input gear 22 is moved in the direction of arrow A in a state where the output gear 23 is fixed as shown in FIG. Rotate to The cage 31 integrated with the input gear 22 rotates in the same direction, and its arm 41 releases the lock of one roller 32 of the clutch 28 (see arrow A in FIG. 2A). On the other hand, when the fixed shaft 21 is inserted from the output gear 23 side while rotating in the direction of arrow C opposite to the above, as shown by the arrow C shown by the one-dot chain line in FIG. Is released. As a result, both rollers 32 become free, and the fixed shaft 21 can be passed through both gears 23 and 22 without being obstructed by the rollers 32.

実施例のトルクリミッタ付き逆入力遮断クラッチは以上のような構成であり、次にその作用について説明する。 The reverse input cutoff clutch with the torque limiter of the embodiment has the above-described configuration, and the operation thereof will be described next.

入力歯車２２が図１の矢印Ａ方向に回転すると、これと一体の保持器３１が同方向に回転し（同図の矢印Ａ参照）、そのアーム４１によって各ポケット４２内の一方のころ３２（図２（ａ）において右側のころ３２）が押され（図２（ａ）の矢印Ａ参照）ロックが解除されフリーとなる。 When the input gear 22 rotates in the direction of arrow A in FIG. 1, the cage 31 integrated with the input gear 22 rotates in the same direction (see arrow A in FIG. 1), and one of the rollers 32 ( In FIG. 2A, the right roller 32) is pushed (see arrow A in FIG. 2A), and the lock is released and becomes free.

保持器３１が前記伝達遅れすき間ａだけ回転すると、その係合凹部４５が外輪２９の係合凸部４６に係合して外輪２９及びこれと一体の出力歯車２３を同方向に回転させる。このとき図２（ａ）の左側のころ３２はフリーとなり、クラッチ２８全体がフリーとなる。 When the retainer 31 rotates by the transmission delay gap a, the engagement recess 45 engages with the engagement protrusion 46 of the outer ring 29 to rotate the outer ring 29 and the output gear 23 integrated therewith in the same direction. At this time, the roller 32 on the left side of FIG. 2A is free, and the entire clutch 28 is free.

一方、外輪２９の回転によりその外径面に緊縛されたコイルばね５２が同方向に回転する（図６（ａ）の矢印Ａ参照）。このとき、コイルばね５２の入力側端面５６は入力側係合突起５８から離れる傾向を持つ。また、これと同時にコイルばね５２の出力側端面５７は、出力側係合突起５９に突き合う傾向を持つ（図６（ｂ）参照）。 On the other hand, the coil spring 52 tightly bound to the outer diameter surface of the outer ring 29 rotates in the same direction (see arrow A in FIG. 6A). At this time, the input side end face 56 of the coil spring 52 tends to be separated from the input side engagement protrusion 58. At the same time, the output side end face 57 of the coil spring 52 tends to abut against the output side engaging protrusion 59 (see FIG. 6B).

入力トルクが前記コイルばね５２の緊縛力によって定まる設定トルクより小さいときは、コイルばね５２を介して出力歯車２３が回転され、トルクの伝達が行われる。入力トルクが前記設定トルクを越えると、その設定トルクに制限されたトルクが出力側に伝達される。 When the input torque is smaller than the set torque determined by the binding force of the coil spring 52, the output gear 23 is rotated via the coil spring 52, and torque is transmitted. When the input torque exceeds the set torque, torque limited to the set torque is transmitted to the output side.

前記とは逆に、出力歯車２３から矢印Ｂ（図２（ａ）、図６（ｂ）参照）のトルクが入力されたとした場合、出力側係合突起５９がコイルばね５２の出力側端面５７の回転方向に係合するが、トルクリミッタ５１の設定トルク以下のトルクである場合はポケット４２内の左側のころ３２（図２（ａ）参照）がロックするので、クラッチ２８全体がロックし、入力歯車２２側へのトルクの伝達が遮断される。逆入力トルクが前記の設定トルク以上に大きい場合は、出力歯車２３がコイルばね５２とともにその設定トルクで外輪２９の外径面を空転する。 Contrary to the above, when the torque indicated by the arrow B (see FIGS. 2A and 6B) is input from the output gear 23, the output-side engagement protrusion 59 is connected to the output-side end face 57 of the coil spring 52. However, when the torque is lower than the set torque of the torque limiter 51, the left roller 32 (see FIG. 2A) in the pocket 42 is locked, so that the entire clutch 28 is locked. Transmission of torque to the input gear 22 side is interrupted. When the reverse input torque is larger than the set torque, the output gear 23 idles the outer diameter surface of the outer ring 29 together with the coil spring 52 with the set torque.

図８は前記の逆入力遮断ユニット６０を、事務機の給紙機構に用いた例を示したものである。図において、６１は駆動モータ、６２は駆動歯車であり、この駆動歯車６２に前記の入力歯車２２が噛み合う。入力歯車２２と同軸状態に固定軸２１に取り付けられた出力歯車２３はローラ歯車６３に噛み合い、紙送りローラ６４を駆動する。入力歯車２２及び出力歯車２３が図示の矢印Ａ方向に回転して紙Ｐを一点矢印Ｘの方向に送り出しているときに紙詰まりが発生し、駆動モータ６１が停止したとする。その紙Ｐを前記と反対方向Ｙに引き抜く際に、前記ユニット６０の設定トルク値以上のトルクで引き抜くと、ユニット６０に逆入力が加えられるが、トルクリミッタ５１の部分で空転を生じ入力側への伝達が遮断されるとともに、出力歯車２３の逆回転により前記の紙Ｐを円滑に引き抜くことができる。 FIG. 8 shows an example in which the reverse input blocking unit 60 is used in a paper feeding mechanism of an office machine. In the figure, 61 is a drive motor, 62 is a drive gear, and the input gear 22 meshes with the drive gear 62. The output gear 23 attached to the fixed shaft 21 coaxially with the input gear 22 meshes with the roller gear 63 and drives the paper feed roller 64. It is assumed that a paper jam occurs when the input gear 22 and the output gear 23 rotate in the direction of the arrow A shown in the figure to feed the paper P in the direction of the one-point arrow X, and the drive motor 61 stops. When pulling out the paper P in the direction Y opposite to the above, if the paper 60 is pulled out with a torque equal to or greater than the set torque value of the unit 60, a reverse input is applied to the unit 60, but idling occurs at the torque limiter 51 and the input side Is interrupted, and the paper P can be smoothly pulled out by the reverse rotation of the output gear 23.

前記ユニット６０の停止状態においては、付勢ばね３３によって両方のころ３２がポケット４２の左右両側のクサビ角θの狭小方向に付勢された初期位置にあり、これにより保持器３１の初期位置が定められる。同時に係合凹部４５と係合凸部４６の係合状態も初期位置にあり、左右両側に一定の伝達遅れすき間ａが確保される。 When the unit 60 is in a stopped state, the rollers 32 are in an initial position in which the rollers 32 are urged in the narrow direction of the wedge angle θ on the left and right sides of the pocket 42 by the urging spring 33, whereby the initial position of the cage 31 is Determined. At the same time, the engagement state of the engagement concave portion 45 and the engagement convex portion 46 is also in the initial position, and a constant transmission delay gap a is secured on both the left and right sides.

なお、保持器３１のアーム４１ところ３２との間の遊びの大きさ、クサビ角θの大きさ、付勢ばね３３のばね力の大きさの如何等によっては前記すき間aは実質的にゼロである場合もあり得る。 The clearance a is substantially zero depending on the amount of play between the arms 41 and 32 of the cage 31, the wedge angle θ, and the spring force of the biasing spring 33. There can be.

実施例の断面図Example cross section （ａ）図１のＸ_１−Ｘ_１線の断面図、（ｂ）（ａ）図の一部拡大断面図(A) cross-sectional view of the _X 1 -X ₁ line in FIG. 1, (b) (a) partially enlarged cross-sectional view of Figure 同上の分解斜視図Exploded perspective view （ａ）同上の入力歯車の斜視図、（ｂ）同上の保持器の斜視図、（ｃ）同上の保持器部分の平面図(A) Perspective view of input gear same as above, (b) Perspective view of retainer as above, (c) Top view of retainer part as above 図１のＸ_２−Ｘ_２線の断面図Sectional view of the _X 2 -X ₂ line in FIG. 1 （ａ）図１のＸ_３−Ｘ_３線の断面図、（ｂ）図１のＸ_４−Ｘ_４線の断面図(A) _X ₃ -X 3 cross-sectional view taken along line in FIG. 1, (b) cross-sectional view of the _X 4 -X ₄ line in FIG. 1 軸挿入時の断面図Sectional view when inserting the shaft 紙送り機構の一部横断平面図Partial cross-sectional plan view of the paper feed mechanism （a）従来例の断面図、（ｂ）（ａ）図のＸ_５−Ｘ_５線の断面図、（ｃ）（ａ）図のＸ_６−Ｘ_６線の断面図(A) cross-sectional view of a conventional example, (b) (a) is a cross-sectional view of _X 5 -X _5-wire, sections of _X 6 -X ₆ line in Figure (c) (a)

Explanation of symbols

２１固定軸（固定部材）
２２入力歯車（入力回転部材）
２３出力歯車（出力回転部材）
２４、２５止め輪
２６係合凹部
２７収納凹部
２８クラッチ
２９外輪
３１保持器
３２ころ
３３付勢ばね
３５円弧部
３６カム面
３７小径部
３８大径部
３９係合片
４１アーム
４２ポケット
４３ころ受け片
４４軸穴
４５係合凹部
４６係合凸部
４７蓋部材
５１両方向トルクリミッタ
５２コイルばね
５３円筒部
５４内向きつば部
５５抜け止めリブ
５６入力側端面
５７出力側端面
５８入力側係合突起
５９出力側係合突起
６０逆入力遮断ユニット
６１駆動モータ
６２駆動歯車
６３ローラ歯車
６４紙送りローラ 21 Fixed shaft (fixed member)
22 Input gear (input rotating member)
23 Output gear (output rotating member)
24, 25 Retaining ring 26 Engaging recess 27 Storage recess 28 Clutch 29 Outer ring 31 Retainer 32 Roller 33 Energizing spring 35 Arc portion 36 Cam surface 37 Small diameter portion 38 Large diameter portion 39 Engagement piece 41 Arm 42 Pocket 43 Roller receiving piece 44 Shaft hole 45 Engagement recess 46 Engagement projection 47 Lid member 51 Bidirectional torque limiter 52 Coil spring 53 Cylindrical part 54 Inward flange 55 Retaining rib 56 Input side end face 57 Output side end face 58 Input side engagement protrusion 59 Output Side engagement protrusion 60 Reverse input blocking unit 61 Drive motor 62 Drive gear 63 Roller gear 64 Paper feed roller

Claims

An input rotation member (22) and an output rotation member (23) are fitted to the fixing member (21) so as to be relatively rotatable, and a two-way lock is provided at a fitting portion between the fixing member (21) and the output rotation member (23). A roller type clutch (28) of the type, and both ends of a roller storage pocket (42) of the clutch (28) are partitioned by a cage (31) engaged with the input rotating member (22), A pair of rollers (32) is urged and stored in a pocket (42) in a direction away from each other in the narrow direction of the pocket (42), and rotated by an input torque from the input rotating member (22). One roller (32) is unlocked by the cage (31) to transmit torque, and on the other hand, any one of the pockets (42) in the pocket (42) by reverse input torque from the output rotating member (23). The roller (32) locks and the torque to the input rotating member (22) In the reverse input blocking unit in which transmission is blocked, the fixed member (21) is constituted by a fixed shaft, and both the input rotating member (22) and the output rotating member (23) are rotatable with respect to the fixed shaft. The roller clutch (28) is incorporated in the inner diameter surface of the output rotating member (23), and a bidirectional torque limiter (51) is provided between the output rotating member (23) and the clutch (28). Is a reverse input blocking unit with a torque limiter.

The input rotation member (22) is constituted by an input gear, the output rotation member (23) is constituted by an output gear, and a pair of cam surfaces whose inclination directions are opposite to the inner diameter surface of the outer ring (29) of the roller clutch (28). A plurality of sets (36) are formed, and both ends of the roller storage pocket (42) including the pair of cam surfaces (36) are partitioned by a pair of arms (41) of the retainer (31), and the retainer ( The reverse input blocking unit with a torque limiter according to claim 1, wherein the outer ring (31) and the outer ring (29) are engaged in a rotational direction with a transmission delay gap (a).

The roller receiving piece (43) protruding in the axial direction along the open surface of the pocket (42) is provided on the inner diameter surface of the output gear constituting the output rotating member (23). A reverse input cutoff unit with a torque limiter according to 1 or 2.

The bidirectional torque limiter (51) has a coil spring (52) tightly bound to an outer diameter surface of the outer ring (29) of the roller clutch (28), and an input side end surface (56) of the coil spring (52). An input side engaging protrusion (58) that engages with the output member is provided on the lid member (47) of the clutch (28), and an output side engaging protrusion that engages with the output side end face (57) of the coil spring (52). The reverse input cutoff unit with a torque limiter according to any one of claims 1 to 3, wherein (59) is provided on an inner diameter surface of the output rotation member (23).