JP5268879B2 - Drive transmission mechanism and image forming apparatus having the same - Google Patents

Drive transmission mechanism and image forming apparatus having the same Download PDF

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JP5268879B2
JP5268879B2 JP2009290977A JP2009290977A JP5268879B2 JP 5268879 B2 JP5268879 B2 JP 5268879B2 JP 2009290977 A JP2009290977 A JP 2009290977A JP 2009290977 A JP2009290977 A JP 2009290977A JP 5268879 B2 JP5268879 B2 JP 5268879B2
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transmission mechanism
coupling
drive transmission
engaging
protrusion
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JP2011132988A (en
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清秀 岡本
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Kyocera Document Solutions Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive transmission mechanism having a coupling with enhanced rigidity and an image forming device equipped therewith. <P>SOLUTION: A drive transmission mechanism 30 includes first and second couplings 31, 32 fitted in rotary shafts 27a, 11a of a drive motor 27 and driving roller 11. The first and second couplings 31, 32 comprise bottom parts 31a, 32a, wall parts 31b, 32b, boss parts 31c, 32c, hole parts 31d, 32d and first and second engaging projections 33, 34. The first and second engaging projections 33, 34 are projected in a thrust direction from the bottom parts 31a, 32a. Side ends of bottom part 31a, 32a of an outside surface and inside surface are respectively formed integrally with the wall parts 31b, 32b and boss parts 31c, 32c. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、画像形成装置に関し、特に回転駆動部材の駆動を伝達するための駆動伝達機構に関するものである。   The present invention relates to an image forming apparatus, and more particularly to a drive transmission mechanism for transmitting the drive of a rotary drive member.

電子写真プロセスを用いた画像形成装置、特にカラー画像形成装置における転写方式は、転写ドラム方式、直接タンデム方式、中間転写方式などが知られているが、各種メディア対応や環境安定性などの点から中間転写方式が多く用いられている。中間転写方式においては、帯電、露光、現像の各工程により各色トナー像を感光体（像担持体）上に現像した後、一次転写部にてトナー像を感光体から中間転写ベルトへ多重転写し、二次転写部にて中間転写ベルトから用紙へ転写し、定着工程で永久像とすることによりカラー画像を形成することができる。   As for the transfer method in an image forming apparatus using an electrophotographic process, particularly a color image forming apparatus, a transfer drum method, a direct tandem method, an intermediate transfer method, and the like are known, but from the viewpoint of compatibility with various media and environmental stability. An intermediate transfer method is often used. In the intermediate transfer system, each color toner image is developed on a photoconductor (image carrier) by charging, exposure, and development processes, and then the toner image is transferred from the photoconductor to an intermediate transfer belt in a primary transfer portion. Then, a color image can be formed by transferring the image from the intermediate transfer belt to the paper in the secondary transfer portion and forming a permanent image in the fixing process.

このような画像形成装置では、中間転写ベルトは駆動ローラ及び従動ローラ等により張架されており、駆動モータからの回転駆動力が駆動ローラに伝達されることにより、中間転写ベルトが回動するようになっている。かかる駆動モータと中間転写ベルトとの駆動を伝達及び解除する方法として、カップリングを有する駆動伝達機構が用いられており、駆動モータの回転軸に嵌合した駆動側のカップリング（第１のカップリング）と駆動ローラの回転軸に嵌合した被駆動側のカップリング（第２のカップリング）とが連結されるようになっている。   In such an image forming apparatus, the intermediate transfer belt is stretched by a drive roller, a driven roller, and the like, and the rotation driving force from the drive motor is transmitted to the drive roller so that the intermediate transfer belt rotates. It has become. As a method for transmitting and releasing the drive between the drive motor and the intermediate transfer belt, a drive transmission mechanism having a coupling is used, and a drive-side coupling (first cup) fitted to the rotation shaft of the drive motor is used. Ring) and a driven-side coupling (second coupling) fitted to the rotating shaft of the driving roller are coupled to each other.

例えば、特許文献１には、駆動軸に軸テーパ部を設けると共に、駆動カップリングの内径部に軸テーパ部と係合可能なカップリングテーパ部を設け、且つ被駆動カップリング及び駆動カップリングの係合部に、相互引き込み力を発生させる引き込み力発生手段を設けることにより、着脱ユニットの操作性を向上しつつ、且つ回転ブレのない駆動伝達を可能とする方法が開示されている。   For example, in Patent Document 1, a shaft taper portion is provided on the drive shaft, a coupling taper portion that can be engaged with the shaft taper portion is provided on the inner diameter portion of the drive coupling, and a driven coupling and a drive coupling are provided. A method has been disclosed in which pulling force generating means for generating a mutual pulling force is provided in the engaging portion, thereby improving the operability of the detachable unit and enabling drive transmission without rotational shaking.

また、特許文献２には、駆動側若しくは被動側カップイングのいずれか一方に形成された凸部と、いずれか他方に形成された凹部と、の回転伝達時の接触面同士のうちいずれか一方の接触面に他方の接触面に向かって突出する抜け止め用突起を形成し、他方の接触面に抜け止め用突起と噛み合う凹みを形成することにより、軸継ぎ手の構造をコンパクトにすると共に、カップリング飛びを防止して、確実な回転伝達を可能とする方法が開示されている。   Further, in Patent Document 2, either one of contact surfaces at the time of rotation transmission between a convex portion formed on one of the driving side or the driven side coupling and a concave portion formed on the other side is disclosed. By forming a retaining protrusion that protrudes toward the other contact surface on the contact surface of the first and a recess that engages with the retaining protrusion on the other contact surface, the structure of the shaft joint is made compact and the cup A method of preventing ring jump and enabling reliable rotation transmission is disclosed.

また、特許文献３には、駆動側部材と被駆動側部材との間に、被駆動側部材が駆動側部材に向かって移動することにより径方向に変形する環状の弾性部材を設けることにより、駆動伝達時の振動を低減すると共に簡単な操作で回転駆動を着脱可能とする方法が開示されている。かかる特許文献３には、駆動側部材及び被駆動側部材が筒状部を有し、筒状部の内周にリブを設けることが開示されている。   Further, in Patent Document 3, by providing an annular elastic member that is deformed in the radial direction when the driven side member moves toward the driving side member between the driving side member and the driven side member, A method is disclosed in which vibration during driving transmission is reduced and the rotational drive can be attached and detached with a simple operation. Patent Document 3 discloses that the driving-side member and the driven-side member have a cylindrical portion, and a rib is provided on the inner periphery of the cylindrical portion.

特開２００５−７６７３４号公報JP 2005-76734 A 特開２００６−２２６３１０号公報JP 2006-226310 A 特開２００８−３０９１８５号公報JP 2008-309185 A

しかし、特許文献１では、係合突起の接触面を傾斜させてカップリングが抜けることを防止しているものの、かかる係合突起をカップリングの円盤部から突設しており、特許文献２においても、抜け止めを防止しているものの、カップリングの外周面に沿って底面部から係合突起を突設している。このため、特許文献１及び２のいずれにおいても係合突起の剛性を十分に確保できず、ねじれが発生するおそれがある。   However, in Patent Document 1, although the contact surface of the engaging protrusion is inclined to prevent the coupling from coming off, the engaging protrusion is protruded from the disk portion of the coupling. In addition, although the retaining is prevented, the engaging projection is provided so as to protrude from the bottom surface along the outer peripheral surface of the coupling. For this reason, in either of Patent Documents 1 and 2, sufficient rigidity of the engaging protrusion cannot be ensured, and twisting may occur.

また、特許文献３では、筒状部にリブを設けることが開示されているが、かかるリブは筒状部の補強用であっていずれの部材とも噛合うものではなく、リブ自体が他の部材と噛合う際の剛性に関し、何ら開示されていない。また、特許文献３では、駆動側部材としてギア、被動側部材として回転軸が用いられており、カップリングの連結に関して示すものではない。このように、特許文献１〜３では、カップリングの剛性について、何ら開示されていない。   Further, in Patent Document 3, it is disclosed that a rib is provided on the cylindrical portion. However, the rib is for reinforcing the cylindrical portion and does not mesh with any member, and the rib itself is another member. There is no disclosure regarding the rigidity when meshing with the knives. Further, in Patent Document 3, a gear is used as the driving member and a rotating shaft is used as the driven member, which is not shown for coupling coupling. Thus, Patent Documents 1 to 3 do not disclose anything about the rigidity of the coupling.

ここで、回転駆動力の伝達時にカップリングの係合突起に撓みが発生すると、カップリング間で回転駆動力の伝達に誤差が発生する可能性がある。また、駆動側のカップリングが高精度に回転した場合であっても、被駆動側のカップリングとの間で負荷変動が発生すると、かかる変動に応じて回転軸上でねじれる力が発生する。   Here, if the coupling protrusions bend during transmission of the rotational driving force, an error may occur in the transmission of the rotational driving force between the couplings. Even when the driving side coupling rotates with high accuracy, if a load fluctuation occurs between the driving side coupling and the driven side coupling, a twisting force is generated on the rotating shaft in accordance with the fluctuation.

また、画像形成装置においては省スペース化が求められており、中間転写ベルトを含む構成部材が着脱可能にユニット化される場合がある。このように省スペース化が強く求められる装置等において、部品であるカップリングもコンパクト化が求められている。そして、特にカップリングがコンパクト化され、軸方向に短く形成されると、係合突起の剛性が低下し易くなるため、カップリング間で係合突起のねじれによる回転駆動力の伝達が不安定になり、画像のムラに悪影響を及ぼすおそれがある。   Further, in the image forming apparatus, space saving is required, and the constituent members including the intermediate transfer belt may be detachably unitized. In such devices and the like that are strongly required to save space, the component coupling is also required to be compact. In particular, if the coupling is made compact and is formed short in the axial direction, the rigidity of the engaging protrusions is likely to be reduced, and therefore the transmission of rotational driving force due to the twisting of the engaging protrusions between the couplings becomes unstable. Therefore, there is a possibility of adversely affecting image unevenness.

本発明は、上記問題に鑑み、カップリングの剛性が高められた駆動伝達機構及びそれを備えた画像形成装置を提供することを目的とする。   SUMMARY An advantage of some aspects of the invention is that it provides a drive transmission mechanism in which the rigidity of a coupling is increased and an image forming apparatus including the drive transmission mechanism.

上記目的を達成するために本発明は、駆動手段及び回転駆動部材の回転軸に装着される第１及び第２のカップリングを有し、前記第１及び第２のカップリングに形成された係合突起が係合することにより前記駆動手段の所定の回転方向への回転駆動力を前記回転駆動部材に伝達する駆動伝達機構であって、前記第１及び第２のカップリングには、円盤状の底面部と、該底面部の外周縁に沿って且つ前記回転軸のスラスト方向に突出する壁部と、が形成され、前記係合突起は、前記底面部における前記壁部の内側に周方向に沿って等間隔に複数配置され、前記底面部から前記スラスト方向に前記壁部よりも突出し、且つ、前記係合突起の外側面における前記底面部側が前記壁部の内側面と一体に形成されることを特徴としている。   In order to achieve the above object, the present invention includes first and second couplings mounted on the rotation shafts of the drive means and the rotary drive member, and the engagement formed on the first and second couplings. A drive transmission mechanism for transmitting a rotational driving force in a predetermined rotational direction of the driving means to the rotational driving member by engaging a mating protrusion, wherein the first and second couplings have a disc shape. And a wall portion projecting along the outer peripheral edge of the bottom surface portion and in the thrust direction of the rotating shaft, and the engaging protrusion is circumferentially formed on the inner side of the wall portion in the bottom surface portion. Are arranged at equal intervals along the wall, project from the bottom surface in the thrust direction in the thrust direction, and the bottom surface portion side of the outer surface of the engaging projection is formed integrally with the inner surface of the wall portion. It is characterized by that.

また本発明は、前記底面部の中央部には、前記回転軸が嵌合するボス部が形成され、前記係合突起の内側面における前記底面部側が前記ボス部と一体に形成されることを特徴としている。   According to the present invention, a boss portion into which the rotating shaft is fitted is formed at a central portion of the bottom surface portion, and the bottom surface portion side of the inner surface of the engagement protrusion is formed integrally with the boss portion. It is a feature.

また本発明は、前記壁部の先端部が、前記スラスト方向とは垂直面となるように形成され、前記係合突起が係合するとき前記垂直面同士が当接することを特徴としている。   Further, the present invention is characterized in that the front end portion of the wall portion is formed to be a vertical surface with respect to the thrust direction, and the vertical surfaces are brought into contact with each other when the engagement protrusion is engaged.

また本発明は、前記壁部に対する前記係合突起の突出長さは、前記底面部に対する前記壁部の突出長さと略同じであることを特徴としている。   Further, the invention is characterized in that a protruding length of the engaging protrusion with respect to the wall portion is substantially the same as a protruding length of the wall portion with respect to the bottom surface portion.

また本発明は、前記第１のカップリングに形成された第１の係合突起の前記周方向両端部に、前記回転方向下流側に向かって傾斜する傾斜面と、前記第２のカップリングに形成された第２の係合突起の前記周方向両端部に、前記回転方向上流側に向かって傾斜する傾斜面と、が形成され、前記第１のカップリングの回転時、前記第１の係合突起の前記回転方向下流側の第１の傾斜面が、前記第２の係合突起の前記回転方向上流側の第２の傾斜面と面接触することを特徴としている。   Further, the present invention provides an inclined surface that is inclined toward the downstream side in the rotational direction at the both ends in the circumferential direction of the first engagement protrusion formed on the first coupling, and the second coupling. An inclined surface that is inclined toward the upstream side in the rotational direction is formed at both ends in the circumferential direction of the formed second engagement projection, and the first engagement is performed when the first coupling is rotated. The first inclined surface on the downstream side in the rotational direction of the joint protrusion is in surface contact with the second inclined surface on the upstream side in the rotational direction of the second engagement protrusion.

また本発明は、前記回転駆動部材は、中間転写ベルトが架け渡され、前記中間転写ベルトを回動させるための駆動ローラであることを特徴としている。   In the invention, it is preferable that the rotation driving member is a driving roller on which an intermediate transfer belt is bridged and for rotating the intermediate transfer belt.

また本発明は、前記駆動伝達機構を備えた画像形成装置である。   The present invention is also an image forming apparatus provided with the drive transmission mechanism.

本発明の第１の構成によれば、第１及び第２のカップリングに、円盤状の底面部と、該底面部の外周縁に沿って且つ回転軸のスラスト方向に突出する壁部と、を形成し、係合突起を、底面部における壁部の内側に周方向に沿って等間隔に複数配置し、底面部からスラスト方向に壁部よりも突出させ、且つ、係合突起の外側面における底面部側が壁部の内側面と一体に形成することによって、カップリングの剛性を高めることができる。また、係合突起のねじれを防止すると共に回転駆動力の伝達を安定させることができる。   According to the first configuration of the present invention, the first and second couplings include a disk-shaped bottom surface portion, a wall portion that protrudes along the outer peripheral edge of the bottom surface portion and in the thrust direction of the rotation shaft, A plurality of engaging projections are arranged at equal intervals along the circumferential direction inside the wall portion of the bottom surface portion, protrude from the bottom portion in the thrust direction, and protrude from the wall portion in the thrust direction. By forming the bottom surface portion side in the body integrally with the inner surface of the wall portion, the rigidity of the coupling can be increased. Further, it is possible to prevent the engagement protrusion from being twisted and to stabilize the transmission of the rotational driving force.

また、本発明の第２の構成によれば、上記第１の構成の駆動伝達機構において、底面部の中央部に、回転軸が嵌合するボス部を形成し、係合突起の内側面における底面部側をボス部と一体に形成することによって、カップリングの剛性をより高めることができる。また、係合突起のねじれをより防止すると共に回転駆動力の伝達をより安定させることができる。   Further, according to the second configuration of the present invention, in the drive transmission mechanism of the first configuration, the boss portion with which the rotating shaft is fitted is formed at the center portion of the bottom surface portion, and the inner surface of the engagement protrusion is formed. By forming the bottom surface portion side integrally with the boss portion, the rigidity of the coupling can be further increased. Further, it is possible to further prevent the engagement protrusion from being twisted and to stabilize the transmission of the rotational driving force.

また、本発明の第３の構成によれば、上記第１または第２の構成の駆動伝達機構において、壁部の先端部を、スラスト方向とは垂直面となるように形成し、係合突起が係合するとき垂直面同士が当接することによって、係合突起の係合をより安定にし、係合突起のねじれをより防止すると共に回転駆動力の伝達をより安定させることができる。   According to the third configuration of the present invention, in the drive transmission mechanism of the first or second configuration, the front end portion of the wall portion is formed to be a surface perpendicular to the thrust direction, and the engagement protrusion When the two surfaces engage with each other, the vertical surfaces come into contact with each other, so that the engagement of the engagement protrusions can be made more stable, twisting of the engagement protrusions can be further prevented, and transmission of the rotational driving force can be made more stable.

また、本発明の第４の構成によれば、上記第１〜第３のいずれかの構成の駆動伝達機構において、壁部に対する係合突起の突出長さを、底面部に対する壁部の突出長さと略同じとすることによって、係合突起の係合をより安定にし、係合突起のねじれをより防止すると共に回転駆動力の伝達をより安定にすることができる。   According to the fourth configuration of the present invention, in the drive transmission mechanism having any one of the first to third configurations, the protruding length of the engaging protrusion with respect to the wall portion is set to the protruding length of the wall portion with respect to the bottom surface portion. Accordingly, the engagement of the engagement protrusion can be made more stable, the twist of the engagement protrusion can be further prevented, and the transmission of the rotational driving force can be made more stable.

また、本発明の第５の構成によれば、上記第１〜第４のいずれかの構成の駆動伝達機構において、第１のカップリングに形成された第１の係合突起の周方向両端部に、回転方向下流側に向かって傾斜する傾斜面と、第２のカップリングに形成された第２の係合突起の周方向両端部に、回転方向上流側に向かって傾斜する傾斜面と、を形成し、第１のカップリングの回転時、第１の係合突起の回転方向下流側の第１の傾斜面が、第２の係合突起の回転方向上流側の第２の傾斜面と面接触することによって、係合突起間に引き込み力が発生するため、係合をより安定させ、カップリングの抜けを防止すると共に調芯作用を発揮させることもでき、係合突起のねじれをより防止すると共に回転駆動力の伝達をより安定させることができる。   According to the fifth configuration of the present invention, in the drive transmission mechanism having any one of the first to fourth configurations, both end portions in the circumferential direction of the first engagement protrusion formed on the first coupling. An inclined surface inclined toward the downstream side in the rotational direction, and inclined surfaces inclined toward the upstream side in the rotational direction at both circumferential ends of the second engagement protrusions formed on the second coupling, When the first coupling is rotated, the first inclined surface on the downstream side in the rotation direction of the first engagement protrusion is the second inclined surface on the upstream side in the rotation direction of the second engagement protrusion. The surface contact generates a pulling force between the engaging protrusions, so that the engagement can be more stabilized, the coupling can be prevented from coming off, and the centering action can be exerted. This can prevent the rotation driving force and stabilize the transmission of the rotational driving force.

また、本発明の第６の構成によれば、上記第１〜第５のいずれかの構成の駆動伝達機構において、回転駆動部材を、中間転写ベルトが架け渡され、中間転写ベルトを回動させるための駆動ローラとすることによって、中間転写ベルトの回動精度を高めることができる。   According to the sixth configuration of the present invention, in the drive transmission mechanism having any one of the first to fifth configurations, the intermediate transfer belt is wound around the rotation drive member, and the intermediate transfer belt is rotated. Therefore, the rotation accuracy of the intermediate transfer belt can be improved.

また、本発明の第７の構成によれば、上記第１〜第６のいずれかの構成の駆動伝達機構を備えた画像形成装置とすることによって、回転駆動力の伝達が安定した良好な画像形成を行うことができる。   According to the seventh configuration of the present invention, the image forming apparatus including the drive transmission mechanism having any one of the first to sixth configurations makes it possible to obtain a good image with stable transmission of the rotational driving force. Formation can be performed.

本発明の一実施形態に係る駆動伝達機構を備えた画像形成装置の全体構成を示す概略図1 is a schematic diagram illustrating an overall configuration of an image forming apparatus including a drive transmission mechanism according to an embodiment of the present invention. 本実施形態の駆動伝達機構周辺を図１の上方から見た平面図The top view which looked at the drive transmission mechanism periphery of this embodiment from the upper direction of FIG. 本実施形態の駆動伝達機構に用いられる第１カップリングを示す斜視図The perspective view which shows the 1st coupling used for the drive transmission mechanism of this embodiment. 第１カップリングの係合突起周辺を示す部分斜視図The partial perspective view which shows the engaging protrusion periphery of a 1st coupling 本実施形態の駆動伝達機構に用いられる第２カップリングを示す斜視図The perspective view which shows the 2nd coupling used for the drive transmission mechanism of this embodiment. 第１及び第２カップリングが連結される状態を示す斜視図The perspective view which shows the state in which the 1st and 2nd coupling is connected. 図６の第１及び第２係合突起が係合する状態を示す部分斜視図The fragmentary perspective view which shows the state which the 1st and 2nd engagement protrusion of FIG. 6 engages.

以下、図面を参照しながら本発明の実施形態を詳細に説明する。図１は、本発明の中間転写ベルトを備えた画像形成装置の構成を示す概略図である。画像形成装置（カラープリンタ）１００本体内には４つの画像形成部Ｐａ、Ｐｂ、Ｐｃ及びＰｄが、搬送方向上流側（図１では右側）から順に配設されている。これらの画像形成部Ｐａ〜Ｐｄは、異なる４色（マゼンタ、シアン、イエロー及びブラック）の画像に対応して設けられており、それぞれ帯電、露光、現像及び転写の各工程によりマゼンタ、シアン、イエロー及びブラックの画像を順次形成する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing a configuration of an image forming apparatus provided with the intermediate transfer belt of the present invention. In the main body of the image forming apparatus (color printer) 100, four image forming portions Pa, Pb, Pc and Pd are sequentially arranged from the upstream side in the transport direction (the right side in FIG. 1). These image forming portions Pa to Pd are provided corresponding to images of four different colors (magenta, cyan, yellow, and black), and magenta, cyan, and yellow are respectively subjected to charging, exposure, development, and transfer processes. And a black image are sequentially formed.

この画像形成部Ｐａ〜Ｐｄには、各色の可視像（トナー像）を担持する感光体ドラム１ａ、１ｂ、１ｃ及び１ｄが配設されており、これらの感光体ドラム１ａ〜１ｄ上に形成されたトナー像が、駆動手段（図示せず）により図１において時計回りに回転しながら各画像形成部に隣接して移動する中間転写ベルト８上に順次転写（一次転写）された後、二次転写ローラ９において用紙Ｓ上に一度に転写（二次転写）され、さらに、定着部７において用紙Ｓ上に定着された後、装置本体より排出される構成となっている。感光体ドラム１ａ〜１ｄを図１において反時計回りに回転させながら、各感光体ドラム１ａ〜１ｄに対する画像形成プロセスが実行される。   Photosensitive drums 1a, 1b, 1c, and 1d that carry visible images (toner images) of the respective colors are disposed in the image forming portions Pa to Pd, and are formed on the photosensitive drums 1a to 1d. The toner images thus transferred are sequentially transferred (primary transfer) onto an intermediate transfer belt 8 that moves adjacent to each image forming unit while rotating clockwise in FIG. 1 by a driving means (not shown). The image is transferred (secondary transfer) onto the sheet S at the same time by the next transfer roller 9, and further fixed on the sheet S by the fixing unit 7 and then discharged from the apparatus main body. An image forming process for each of the photosensitive drums 1a to 1d is executed while rotating the photosensitive drums 1a to 1d counterclockwise in FIG.

トナー像が転写される用紙Ｓは、装置下部の用紙カセット１６内に収容されており、給紙ローラ１２ａ及びレジストローラ対１２ｂを介して二次転写ローラ９へと搬送される。中間転写ベルト８には誘電体樹脂製のシートが用いられ、その両端部を互いに重ね合わせて接合しエンドレス形状にしたベルトや、継ぎ目を有しない（シームレス）ベルトが用いられる。また、二次転写ローラ９の下流側には中間転写ベルト８表面に残存するトナーを除去するためのクリーニングブレード１９が配置されている。   The paper S on which the toner image is transferred is accommodated in a paper cassette 16 at the lower part of the apparatus, and is conveyed to the secondary transfer roller 9 via the paper feed roller 12a and the registration roller pair 12b. A sheet made of a dielectric resin is used for the intermediate transfer belt 8, and a belt in which both ends thereof are overlapped and joined to form an endless shape, or a belt without a seam (seamless) is used. Further, a cleaning blade 19 for removing toner remaining on the surface of the intermediate transfer belt 8 is disposed on the downstream side of the secondary transfer roller 9.

次に、画像形成部Ｐａ〜Ｐｄについて説明する。回転自在に配設された感光体ドラム１ａ〜１ｄの周囲及び下方には、感光体ドラム１ａ〜１ｄを帯電させる帯電器２ａ、２ｂ、２ｃ及び２ｄと、各感光体ドラム１ａ〜１ｄに画像情報を露光する露光装置４と、感光体ドラム１ａ〜１ｄ上にトナー像を形成する現像装置３ａ、３ｂ、３ｃ及び３ｄと、感光体ドラム１ａ〜１ｄ上に残留した現像剤（トナー）を除去するクリーニング部５ａ、５ｂ、５ｃ及び５ｄが設けられている。   Next, the image forming units Pa to Pd will be described. There are chargers 2a, 2b, 2c, and 2d for charging the photosensitive drums 1a to 1d and image information on the photosensitive drums 1a to 1d around and below the photosensitive drums 1a to 1d that are rotatably arranged. The exposure device 4 for exposing the toner, the developing devices 3a, 3b, 3c and 3d for forming toner images on the photosensitive drums 1a to 1d, and the developer (toner) remaining on the photosensitive drums 1a to 1d are removed. Cleaning units 5a, 5b, 5c and 5d are provided.

ユーザにより画像形成開始が入力されると、先ず、帯電器２ａ〜２ｄによって感光体ドラム１ａ〜１ｄの表面を一様に帯電させ、次いで露光装置４によって光照射し、各感光体ドラム１ａ〜１ｄ上に画像信号に応じた静電潜像を形成する。現像装置３ａ〜３ｄは、感光体ドラム１ａ〜１ｄに対向配置された現像ローラ（現像剤担持体）を備え、それぞれマゼンタ、シアン、イエロー及びブラックの各色のトナーが補給装置（図示せず）によって所定量充填されている。このトナーは、現像装置３ａ〜３ｄの現像ローラにより感光体ドラム１ａ〜１ｄ上に供給され、静電的に付着することにより、露光装置４からの露光により形成された静電潜像に応じたトナー像が形成される。   When the start of image formation is input by the user, first, the surfaces of the photosensitive drums 1a to 1d are uniformly charged by the chargers 2a to 2d, and then light is irradiated by the exposure device 4 to each of the photosensitive drums 1a to 1d. An electrostatic latent image corresponding to the image signal is formed on the top. Each of the developing devices 3a to 3d includes a developing roller (developer carrying member) disposed so as to face the photosensitive drums 1a to 1d, and each of magenta, cyan, yellow, and black toners is supplied by a replenishing device (not shown). A predetermined amount is filled. The toner is supplied onto the photosensitive drums 1a to 1d by the developing rollers of the developing devices 3a to 3d, and electrostatically adheres to the electrostatic latent image formed by exposure from the exposure device 4. A toner image is formed.

そして、中間転写ベルト８に所定の転写電圧で電界が付与された後、一次転写ローラ６ａ〜６ｄにより感光体ドラム１ａ〜１ｄ上のマゼンタ、シアン、イエロー、及びブラックのトナー像が中間転写ベルト８上に一次転写される。これらの４色の画像は、所定のフルカラー画像形成のために予め定められた所定の位置関係をもって形成される。その後、引き続き行われる新たな静電潜像の形成に備え、感光体ドラム１ａ〜１ｄの表面に残留したトナーがクリーニング部５ａ〜５ｄにより除去される。   After an electric field is applied to the intermediate transfer belt 8 at a predetermined transfer voltage, magenta, cyan, yellow, and black toner images on the photosensitive drums 1a to 1d are transferred to the intermediate transfer belt 8 by the primary transfer rollers 6a to 6d. Primary transferred onto. These four color images are formed with a predetermined positional relationship predetermined for forming a predetermined full-color image. Thereafter, the toner remaining on the surfaces of the photosensitive drums 1a to 1d is removed by the cleaning units 5a to 5d in preparation for the subsequent formation of a new electrostatic latent image.

中間転写ベルト８は、従動ローラ１０、駆動ローラ（回転伝達部材）１１及びテンションローラ２０に掛け渡されおり、これらが一体となって装置本体に着脱可能に装着されている。駆動モータ（駆動手段）２７（図２参照）からの回転駆動力が駆動伝達機構３０により駆動ローラ１１に伝達されて該ローラが回転し、かかる回転に伴い中間転写ベルト８が時計回りに回転を開始すると、用紙Ｓがレジストローラ１２ｂから所定のタイミングで中間転写ベルト８に隣接して設けられた二次転写ローラ９へ搬送され、中間転写ベルト８とのニップ部（二次転写ニップ部）において用紙Ｓ上にフルカラー画像が二次転写される。トナー像が転写された用紙Ｓは定着部７へと搬送される。駆動伝達機構３０の詳細については後述する。   The intermediate transfer belt 8 is stretched over a driven roller 10, a driving roller (rotation transmission member) 11, and a tension roller 20, and these are integrated and detachably attached to the apparatus main body. A rotational driving force from a driving motor (driving means) 27 (see FIG. 2) is transmitted to the driving roller 11 by the driving transmission mechanism 30 to rotate the roller, and the intermediate transfer belt 8 rotates clockwise with the rotation. When started, the sheet S is conveyed from the registration roller 12b to the secondary transfer roller 9 provided adjacent to the intermediate transfer belt 8 at a predetermined timing, and at a nip portion (secondary transfer nip portion) with the intermediate transfer belt 8. A full-color image is secondarily transferred onto the paper S. The sheet S on which the toner image is transferred is conveyed to the fixing unit 7. Details of the drive transmission mechanism 30 will be described later.

定着部７に搬送された用紙Ｓは、定着ローラ対１３のニップ部（定着ニップ部）を通過する際に加熱及び加圧されてトナー像が用紙Ｓの表面に定着され、所定のフルカラー画像が形成される。フルカラー画像が形成された用紙Ｓは、複数方向に分岐した分岐部１４によって搬送方向が振り分けられる。用紙Ｓの片面のみに画像を形成する場合は、そのまま排出ローラ対１５によって排出トレイ１７に排出される。   The sheet S conveyed to the fixing unit 7 is heated and pressurized when passing through the nip portion (fixing nip portion) of the pair of fixing rollers 13 to fix the toner image on the surface of the sheet S, and a predetermined full-color image is formed. It is formed. The sheet S on which the full-color image is formed is distributed in the transport direction by the branching section 14 that branches in a plurality of directions. When an image is formed on only one side of the sheet S, the sheet is discharged to the discharge tray 17 by the discharge roller pair 15 as it is.

一方、用紙Ｓの両面に画像を形成する場合は、定着部７を通過した用紙Ｓの一部を一旦排出ローラ対１５から装置外部にまで突出させる。その後、用紙Ｓは排出ローラ対１５を逆回転させることにより分岐部１４で用紙搬送路１８に振り分けられ、画像面を反転させた状態で二次転写ローラ９に再搬送される。そして、中間転写ベルト８上に形成された次の画像が二次転写ローラ９により用紙Ｓの画像が形成されていない面に転写され、定着部７に搬送されてトナー像が定着された後、排出トレイ１７に排出される。   On the other hand, when images are formed on both sides of the sheet S, a part of the sheet S that has passed through the fixing unit 7 is once protruded from the discharge roller pair 15 to the outside of the apparatus. Thereafter, the sheet S is distributed to the sheet conveyance path 18 by the branching section 14 by rotating the discharge roller pair 15 in the reverse direction, and is conveyed again to the secondary transfer roller 9 with the image surface reversed. Then, after the next image formed on the intermediate transfer belt 8 is transferred to the surface of the sheet S where the image is not formed by the secondary transfer roller 9 and conveyed to the fixing unit 7 to fix the toner image, It is discharged to the discharge tray 17.

図２は、本実施形態の駆動伝達機構周辺を図１の上方から見た平面図であり、図３は、本実施形態の駆動伝達機構に用いられる第１カップリングを示す斜視図であり、図４は、第１カップリングの係合突起周辺を示す部分斜視図であり、図５は、本実施形態の駆動伝達機構に用いられる第２カップリングを示す斜視図である。また、図６は、第１及び第２カップリングが連結する状態を示す斜視図であり、図７は、図６の第１及び第２係合突起が係合する状態を示す部分斜視図である。図１と共通する部分には共通する符号を付して説明を省略する。なお、便宜上、図４では、壁部３１ｂを省略して示し、図６では壁部３１ｂ、３２ｂを破線で示す。   FIG. 2 is a plan view of the periphery of the drive transmission mechanism of the present embodiment as viewed from above in FIG. 1, and FIG. 3 is a perspective view showing a first coupling used in the drive transmission mechanism of the present embodiment. FIG. 4 is a partial perspective view showing the vicinity of the engagement protrusion of the first coupling, and FIG. 5 is a perspective view showing the second coupling used in the drive transmission mechanism of the present embodiment. 6 is a perspective view showing a state in which the first and second couplings are connected. FIG. 7 is a partial perspective view showing a state in which the first and second engaging protrusions in FIG. 6 are engaged. is there. Portions common to those in FIG. 1 are denoted by common reference numerals and description thereof is omitted. For the sake of convenience, the wall portion 31b is omitted in FIG. 4 and the wall portions 31b and 32b are indicated by broken lines in FIG.

図２に示すように、駆動伝達機構３０は、駆動モータ２７の回転軸２７ａの先端に嵌合（装着）された第１カップリング（第１のカップリング）３１と、駆動ローラ１１の回転軸１１ａの一端に嵌合された第２カップリング（第２のカップリング）３２と、から構成されている。第１及び第２カップリング３１、３２は同様の構成であり、共に樹脂材料から形成されている。   As shown in FIG. 2, the drive transmission mechanism 30 includes a first coupling (first coupling) 31 fitted (attached) to the tip of the rotation shaft 27 a of the drive motor 27, and a rotation shaft of the drive roller 11. And a second coupling (second coupling) 32 fitted to one end of 11a. The first and second couplings 31 and 32 have the same configuration, and are both formed from a resin material.

図３に示すように、第１カップリング３１は、大まかには、底面部３１ａ、壁部３１ｂ、ボス部３１ｃ、穴部３１ｄ及び第１係合突起３３を有している。底面部３１ａは、円盤状から成り、底面部３１ａの一側面（図の上面）の外周に沿って、底面部３１ａから垂直に突出する環状の壁部３１ｂが形成されている。また、壁部３１ｂの先端部は、回転軸２７ａのスラスト方向とは垂直面となるように形成されている。   As shown in FIG. 3, the first coupling 31 roughly has a bottom surface portion 31 a, a wall portion 31 b, a boss portion 31 c, a hole portion 31 d, and a first engagement protrusion 33. The bottom surface portion 31a is formed in a disk shape, and an annular wall portion 31b that protrudes perpendicularly from the bottom surface portion 31a is formed along the outer periphery of one side surface (upper surface in the drawing) of the bottom surface portion 31a. The tip of the wall 31b is formed so as to be a surface perpendicular to the thrust direction of the rotating shaft 27a.

底面部３１ａの中央部には、ボス部３１ｃが形成されている。かかるボス部３１ｃは、壁部３１ｂよりも底面部３１ａからスラスト方向（図の上方）に突出しないように形成されている。   A boss portion 31c is formed at the center of the bottom surface portion 31a. The boss portion 31c is formed so as not to protrude in the thrust direction (upward in the figure) from the bottom surface portion 31a rather than the wall portion 31b.

ボス部３１ｃの中央部には、断面略小判形状の穴部３１ｄが形成されている。回転軸２７ａの一先端部（図示せず）は、穴部３１ｄと嵌合するように断面略小判形状に形成されており、かかる先端部に穴部３１ｄが嵌合することにより、第１カップリング３１が回転軸２７ａと共に回転できるようになっている。なお、その他例えば、回転軸２７ａの上記先端部に雄ネジ部を形成すると共に、穴部３１ｄの内周面に雌ネジ部を形成し、上記先端部を穴部３１ｄに螺合することもできる。   A hole 31d having a substantially oval cross section is formed in the center of the boss 31c. One end portion (not shown) of the rotating shaft 27a is formed in a substantially oval cross section so as to be fitted to the hole portion 31d, and the hole portion 31d is fitted to the tip portion, thereby the first cup. The ring 31 can be rotated together with the rotary shaft 27a. In addition, for example, a male screw portion can be formed at the tip portion of the rotating shaft 27a, a female screw portion can be formed on the inner peripheral surface of the hole portion 31d, and the tip portion can be screwed into the hole portion 31d. .

そして、壁部３１ｂの内周側であってボス部３１ｃとの間には、第１係合突起３３が周方向に沿って略等間隔に３つ形成されている。図３及び図４に示すように、第１係合突起３３の周方向長さは、第１係合突起３３同士の間隔よりも短く形成されている。また、第１係合突起３３は、底面部３１ａから壁部３１ｂよりもスラスト方向（図の上方）に突出しており、第１係合突起３３の外側面における底面部３１ａ側は、壁部３１ｂと一体に形成され、これと繋がっている。   Three first engaging projections 33 are formed at substantially equal intervals along the circumferential direction between the inner peripheral side of the wall portion 31b and the boss portion 31c. As shown in FIGS. 3 and 4, the circumferential length of the first engagement protrusions 33 is shorter than the interval between the first engagement protrusions 33. The first engaging protrusion 33 protrudes from the bottom surface portion 31a in the thrust direction (upward in the drawing) from the wall portion 31b, and the bottom surface portion 31a side of the outer surface of the first engaging protrusion 33 is the wall portion 31b. And is connected to this.

すなわち、第１係合突起３３は、底面部３１ａと壁部３１ｂの内側面とからスラスト方向に突出している。また、第１係合突起３３の壁部３１ｂとの繋がり部分からの突出部と、壁部３１ｂとの間には、後述する第２カップリング３２との連結時、第１係合突起３３と、後述する第２カップリング３２の壁部３２ｂと、が公差等により干渉するおそれを回避するために、隙間Ｇ１が設けられている。   That is, the first engaging protrusion 33 protrudes in the thrust direction from the bottom surface portion 31a and the inner surface of the wall portion 31b. Further, the first engaging protrusion 33 and the protruding portion from the connection portion with the wall portion 31b of the first engaging protrusion 33 and the wall portion 31b are connected to the second coupling 32 described later, In order to avoid the possibility of interference with a wall portion 32b of the second coupling 32, which will be described later, due to tolerance or the like, a gap G1 is provided.

また、第１係合突起３３の底面部３１ａからの突出長さＬ２は、壁部３１ｂの底面部３１ａからの突出長さＬ１の略２倍に設定されている。すなわち、第１係合突起３３の壁部３１ｂからの突出長さ（Ｌ２−Ｌ１）は、壁部３１ｂの突出長さＬ１と略同じに設定されている。これにより、後述するように第１カップリング３１の壁部３１ｂと第２カップリング３２の壁部３２ｂとを当接させたとき、第１及び第２係合突起３３、３４の突出端部をそれぞれ、底面部３２ａ、３１ａと近接させることができるため、第１及び第２係合突起３３、３４の接触面積が大きくなり、係合を安定にすることができる。   Further, the protruding length L2 of the first engaging protrusion 33 from the bottom surface portion 31a is set to be approximately twice the protruding length L1 of the wall portion 31b from the bottom surface portion 31a. That is, the protruding length (L2-L1) of the first engaging protrusion 33 from the wall portion 31b is set to be substantially the same as the protruding length L1 of the wall portion 31b. Thereby, when the wall part 31b of the 1st coupling 31 and the wall part 32b of the 2nd coupling 32 are made to contact | abut so that it may mention later, the protrusion edge part of the 1st and 2nd engagement protrusion 33,34 is made. Since they can be brought close to the bottom surface portions 32a and 31a, the contact areas of the first and second engaging protrusions 33 and 34 are increased, and the engagement can be stabilized.

第１係合突起３３の内側面における底面部３１ａ側は、ボス部３１ｃと一体に形成され、これと繋がっている。また、第１係合突起３３のボス部３１ｃとの繋がり部分からの突出部と、ボス部３１ｃとの間には、後述する第２カップリング３２との連結時、第１係合突起３３と、後述する第２カップリング３２のボス部３２ｃと、が公差等により干渉するおそれを回避するために、隙間Ｇ２が設けられている。   The bottom surface portion 31a side on the inner side surface of the first engagement protrusion 33 is formed integrally with the boss portion 31c and connected thereto. In addition, the first engaging protrusion 33 and the boss 31c are connected to the second coupling 32, which will be described later, between the protrusion from the connecting portion of the first engaging protrusion 33 with the boss 31c and the boss 31c. In order to avoid the possibility of interference with a boss portion 32c of the second coupling 32 described later due to tolerance or the like, a gap G2 is provided.

第１係合突起３３の周方向両端部には、回転軸２７ａの画像形成時の回転方向（図６参照）下流側に向かって傾斜する第１傾斜面（第１の傾斜面）３３ａ及び第２傾斜面３３ｂが形成されている。また、回転方向下流側に第１傾斜面３３ａ、上流側に第２傾斜面３３ｂが形成されている。   At both ends in the circumferential direction of the first engaging protrusion 33, there are a first inclined surface (first inclined surface) 33a inclined toward the downstream side in the rotation direction (see FIG. 6) of the rotating shaft 27a during image formation, and the first Two inclined surfaces 33b are formed. A first inclined surface 33a is formed on the downstream side in the rotational direction, and a second inclined surface 33b is formed on the upstream side.

図５に示すように、第２カップリング３２は第１カップリング３１と同様の構成であり、第２カップリング３２には、第１カップリング３１の底面部３１ａ、壁部３１ｂ、ボス部３１ｃ、穴部３１ｄ、第１係合突起３３、隙間Ｇ１、Ｇ２、第１傾斜面３３ａ及び第２傾斜面３３ｂとそれぞれ同様の、底面部３２ａ、壁部３２ｂ、ボス部３２ｃ、穴部３２ｄ、第２係合突起３４、隙間Ｇ１、Ｇ２、第３傾斜面（第２の傾斜面）３４ａ及び第４傾斜面３４ｂが形成されている。   As shown in FIG. 5, the second coupling 32 has the same configuration as the first coupling 31. The second coupling 32 includes a bottom surface portion 31 a, a wall portion 31 b, and a boss portion 31 c of the first coupling 31. , Hole portion 31d, first engagement protrusion 33, gaps G1, G2, first inclined surface 33a and second inclined surface 33b, respectively, bottom surface portion 32a, wall portion 32b, boss portion 32c, hole portion 32d, 2 engaging protrusions 34, gaps G1, G2, a third inclined surface (second inclined surface) 34a and a fourth inclined surface 34b are formed.

なお、穴部３２ｄは、回転軸１１ａにおいて断面略小判形状に形成された一先端部（図示せず）に嵌合するようになっている。また、第２カップリング３２は、第１カップリング３１と対向して連結されるため、かかる連結時、第３傾斜面３４ａは回転方向上流側、第４傾斜面３４ｂは回転方向下流側に配置される（図６及び図７参照）。   The hole 32d is adapted to be fitted to one end portion (not shown) formed in a substantially oval cross section on the rotating shaft 11a. Further, since the second coupling 32 is coupled to face the first coupling 31, at the time of the coupling, the third inclined surface 34a is disposed on the upstream side in the rotational direction, and the fourth inclined surface 34b is disposed on the downstream side in the rotational direction. (See FIGS. 6 and 7).

また、第１及び第２カップリング３１、３２が連結する際、第２カップリング３２は、コイルバネ等の付勢部材（図示せず）により、第１カップリング３１に対して付勢されるようになっている。かかる連結後、第１カップリング３１が回転すると、第３傾斜面３４ａは第１傾斜面３３ａと面接触して係合するようになっている。   Further, when the first and second couplings 31 and 32 are connected, the second coupling 32 is biased against the first coupling 31 by a biasing member (not shown) such as a coil spring. It has become. After the connection, when the first coupling 31 is rotated, the third inclined surface 34a is brought into contact with and engaged with the first inclined surface 33a.

このような第１及び第２カップリング３１、３２をそれぞれ、回転軸２７ａ及び回転軸１１ａに嵌合し、一体化された中間転写ベルト８（図１参照）及び駆動モータ２７を装置本体に装着すると、図６に示すように、第１カップリング３１の第１係合突起３３の間に第２カップリング３２の第２係合突起３４が挿入されると共に、壁部３１ｂ、３２ｂの垂直面同士が当接する。   The first and second couplings 31 and 32 are fitted to the rotary shaft 27a and the rotary shaft 11a, respectively, and the integrated intermediate transfer belt 8 (see FIG. 1) and the drive motor 27 are attached to the apparatus main body. Then, as shown in FIG. 6, the second engagement protrusion 34 of the second coupling 32 is inserted between the first engagement protrusions 33 of the first coupling 31, and the vertical surfaces of the walls 31b and 32b. They abut.

そして、回転軸２７ａが回転すると、図６及び図７に示すように、回転方向（白抜き矢印方向）において、第１係合突起３３の第１傾斜面３３ａが、第２係合突起３４の第３傾斜面３４ａと面接触して噛み合い、第３傾斜面３４ａを回転方向下流側に押圧する。これにより、第２係合突起３４が回転軸１１ａと共に回転し、駆動モータ２７の回転駆動力が駆動ローラ１１に伝達される。このとき、第１及び第２カップリング３１、３２が回転すると、第１傾斜面３３ａと第３傾斜部３４ａとの間に引き込み力が発生する。   When the rotary shaft 27a rotates, the first inclined surface 33a of the first engagement protrusion 33 in the rotation direction (in the direction of the white arrow) is rotated by the second engagement protrusion 34 as shown in FIGS. The third inclined surface 34a is brought into surface contact with the third inclined surface 34a and meshes, and the third inclined surface 34a is pressed downstream in the rotational direction. As a result, the second engaging protrusion 34 rotates together with the rotating shaft 11 a, and the rotational driving force of the driving motor 27 is transmitted to the driving roller 11. At this time, when the first and second couplings 31 and 32 rotate, a pulling force is generated between the first inclined surface 33a and the third inclined portion 34a.

なお、ここでは、第１係合突起３３の周方向長さを第１係合突起３３同士の間隔よりも短く、同様に、第２係合突起３４の周方向長さを第２係合突起３４同士の間隔よりも短く形成したため、第２係合突起３４を第１係合突起３３間に挿入し易くなっており、第１係合突起３３と第２係合突起３４とを十分に係合させることが可能となる。   Here, the circumferential length of the first engaging projections 33 is shorter than the interval between the first engaging projections 33, and similarly, the circumferential length of the second engaging projections 34 is set to the second engaging projections. Since the second engagement protrusion 34 is easily inserted between the first engagement protrusions 33 because the distance between them is shorter than the distance between them, the first engagement protrusion 33 and the second engagement protrusion 34 are sufficiently engaged. Can be combined.

上記の通り、本実施形態では、第１及び第２のカップリング３１、３２に、円盤状の底面部３１ａ、３２ａと、該底面部３１ａ、３２ａの外周縁に沿って且つ回転軸２７ａ、１１ａのスラスト方向に突出する壁部３１ｂ、３２ｂと、を形成し、第１及び第２係合突起３３、３４を、底面部３１ａ、３２ａにおける壁部３１ｂ、３２ｂの内側に周方向に沿って等間隔に複数配置し、底面部３１ａ、３２ａからスラスト方向に壁部３１ｂ、３２ｂよりも突出させ、且つ、第１及び第２係合突起３３、３４の外側面における底面部３１ａ、３２ａ側を壁部３１ｂ、３２ｂの内側面と一体に形成した。   As described above, in the present embodiment, the first and second couplings 31 and 32 are provided with the disk-shaped bottom surface portions 31a and 32a, and along the outer peripheral edges of the bottom surface portions 31a and 32a and the rotation shafts 27a and 11a. Wall portions 31b and 32b projecting in the thrust direction of the first and second engaging projections 33 and 34 are formed along the circumferential direction inside the wall portions 31b and 32b of the bottom surface portions 31a and 32a, etc. A plurality of them are arranged at intervals, protrude from the bottom surface portions 31a, 32a in the thrust direction beyond the wall portions 31b, 32b, and the bottom surface portions 31a, 32a side on the outer surfaces of the first and second engaging projections 33, 34 are walls. It formed integrally with the inner surface of the parts 31b and 32b.

これにより、第１及び第２カップリング３１、３２の剛性を高めることができる。また、第１及び第２係合突起３３、３４のねじれを防止すると共に回転駆動力の伝達を安定させることができる。   Thereby, the rigidity of the 1st and 2nd couplings 31 and 32 can be improved. Further, it is possible to prevent the first and second engaging protrusions 33 and 34 from being twisted and to stabilize the transmission of the rotational driving force.

ここでは、第１及び第２係合突起３３、３４と壁部３１ｂ、３２ｂとの間に隙間Ｇ１を設けたため、壁部３２ｂ、３１ｂとの干渉をより回避しつつ第１及び第２係合突起３３、３４を係合させることができる。しかし、かかる隙間Ｇ１を設けない構成とすることもでき、また、かかる隙間Ｇ１の代わりに第１及び第２係合突起３３、３４の外側面を壁部３１ｂ、３２ｂから突出端部に向かって内周側に傾斜するテーパ形状とすることもできる。   Here, since the gap G1 is provided between the first and second engagement protrusions 33 and 34 and the wall portions 31b and 32b, the first and second engagements are further avoided while avoiding interference with the wall portions 32b and 31b. The protrusions 33 and 34 can be engaged. However, the gap G1 may not be provided, and the outer surfaces of the first and second engaging protrusions 33 and 34 are directed from the wall portions 31b and 32b toward the protruding end instead of the gap G1. It can also be made into the taper shape which inclines to an inner peripheral side.

また、本実施形態では、底面部３１ａ、３２ａの中央部に、回転軸２７ａ、１１ａが嵌合するボス部３１ｃ、３２ｃを形成し、第１及び第２係合突起３３、３４の内側面における底面部３１ａ、３２ａ側をボス部３１ｃ、３２ｃと一体に形成したため、第１及び第２カップリング３１、３２の剛性をより高めることができる。また、第１及び第２係合突起３３、３４のねじれをより防止すると共に回転駆動力の伝達をより安定させることができる。   Moreover, in this embodiment, the boss | hub parts 31c and 32c which the rotating shafts 27a and 11a fit are formed in the center part of the bottom face parts 31a and 32a, and the inner surface of the 1st and 2nd engaging protrusions 33 and 34 is formed. Since the bottom surface portions 31a and 32a are formed integrally with the boss portions 31c and 32c, the rigidity of the first and second couplings 31 and 32 can be further increased. Further, it is possible to further prevent the first and second engaging protrusions 33 and 34 from being twisted and to stabilize the transmission of the rotational driving force.

ここでは、第１係合突起３３、３４と、ボス部３１ｃ、３２ｃとの間に隙間Ｇ２を設けたため、ボス部３２ｃ、３１ｃとの干渉をより回避しつつ第１及び第２係合突起３３、３４を係合させることができる。しかし、かかる隙間Ｇ２を設けない構成とすることもでき、また、かかる隙間Ｇ２の代わりに第１及び第２係合突起３３、３４の内側面をボス部３１ｃ、３２ｃから突出端部に向かって外周側に傾斜するテーパ形状とすることもできる。また、第１及び第２係合突起３３、３４をボス部３１ｃ、３２ｃから離間させて形成することもできる。   Here, since the gap G2 is provided between the first engagement protrusions 33 and 34 and the boss portions 31c and 32c, the first and second engagement protrusions 33 are further avoided while avoiding interference with the boss portions 32c and 31c. , 34 can be engaged. However, the gap G2 may not be provided, and instead of the gap G2, the inner surfaces of the first and second engagement protrusions 33 and 34 are directed from the bosses 31c and 32c toward the protruding end. It can also be made into the taper shape which inclines to the outer peripheral side. Further, the first and second engaging protrusions 33 and 34 can be formed apart from the boss portions 31c and 32c.

また、本実施形態では、壁部３１ｂ、３２ｂの先端部を、スラスト方向とは垂直面となるように形成し、第１及び第２係合突起３３、３４を係合するとき垂直面同士が当接することとしたため、第１及び第２係合突起３３、３４の係合をより安定にし、第１及び第２係合突起３３、３４のねじれをより防止すると共に回転駆動力の伝達をより安定にすることができる。   In the present embodiment, the end portions of the walls 31b and 32b are formed so as to be perpendicular to the thrust direction, and the vertical surfaces are engaged with each other when the first and second engaging protrusions 33 and 34 are engaged. Since the contact is made, the engagement of the first and second engaging protrusions 33 and 34 is made more stable, the twisting of the first and second engaging protrusions 33 and 34 is further prevented, and the rotational driving force is further transmitted. Can be stable.

また、本実施形態では、壁部３１ｂ、３２ｂに対する第１及び第２係合突起３３、３４の突出長さ（Ｌ２−Ｌ１）を、底面部３１ａ、３２ａに対する壁部３１ｂ、３２ｂの突出長さＬ１と略同じにしたため、第１及び第２係合突起３３、３４の係合をより安定にすると共に回転駆動の伝達をより安定にすることができる。しかし、第１及び第２係合突起３３、３４が係合可能であれば、壁部３１ｂ、３２ｂの形状等は特に限定されるものではない。   Moreover, in this embodiment, the protrusion length (L2-L1) of the 1st and 2nd engagement protrusions 33 and 34 with respect to wall part 31b, 32b is made into the protrusion length of wall part 31b, 32b with respect to bottom face part 31a, 32a. Since it is substantially the same as L1, the engagement of the first and second engagement protrusions 33 and 34 can be made more stable, and the transmission of the rotational drive can be made more stable. However, the shape and the like of the wall portions 31b and 32b are not particularly limited as long as the first and second engagement protrusions 33 and 34 can be engaged.

また、本実施形態では、第１係合突起３３の周方向両端部に、回転方向下流側に向かって傾斜する第１及び第２傾斜面３３ａ、３３ｂを形成し、第２係合突起３４の周方向両端部に、回転方向上流側に向かって傾斜する第３及び第４傾斜面３４ａ、３４ｂを形成し、第１カップリング３１の回転時、第１傾斜面３３ａが、第３傾斜面３４ａと面接触することとした。   Further, in the present embodiment, first and second inclined surfaces 33 a and 33 b that are inclined toward the downstream side in the rotation direction are formed at both ends in the circumferential direction of the first engagement protrusion 33, and Third and fourth inclined surfaces 34a and 34b that are inclined toward the upstream side in the rotational direction are formed at both ends in the circumferential direction, and when the first coupling 31 is rotated, the first inclined surface 33a becomes the third inclined surface 34a. And surface contact.

これにより、第１係合突起３３と第２係合突起３４との間に引き込み力が発生するため、係合をより安定させ、第１及び第２カップリング３１、３２の抜けを防止すると共に調芯作用を発揮させることもでき、第１及び第２係合突起３３、３４のねじれをより防止すると共に回転駆動力の伝達をより安定させることができる。   As a result, a pulling force is generated between the first engagement protrusion 33 and the second engagement protrusion 34, so that the engagement is further stabilized and the first and second couplings 31 and 32 are prevented from coming off. A centering action can also be exerted, and the twisting of the first and second engaging protrusions 33 and 34 can be further prevented and the transmission of the rotational driving force can be further stabilized.

なお、第１及び第２係合突起３３、３４の形状は、本実施形態に特に限定されるものではなく、第１及び第３傾斜面３３ａ、３４ａの当接状態等、装置構成等に応じて適宜設定することができる。また、第１〜第４傾斜面３３ａ、３３ｂ、３４ａ、３４ｂの形状等も、装置構成等に応じて適宜設定することができる。   Note that the shapes of the first and second engagement protrusions 33 and 34 are not particularly limited to the present embodiment, and the first and third inclined surfaces 33a and 34a are in contact with each other according to the apparatus configuration and the like. Can be set as appropriate. In addition, the shapes and the like of the first to fourth inclined surfaces 33a, 33b, 34a, and 34b can be appropriately set according to the device configuration and the like.

また、本実施形態では、第１及び第２係合突起３３、３４をそれぞれ３つ形成したが、かかる第１及び第２係合突起３３、３４の数量は特に限定されず、２つ以上とすることができる。ただし、第１及び第２係合突起３３、３４の数量を多くすると、両者を噛み合わせるためのスペースが必要となり、その分、第１及び第２係合突起３３、３４の周方向長さが短くなる。   In the present embodiment, three first and second engagement protrusions 33 and 34 are formed, but the number of the first and second engagement protrusions 33 and 34 is not particularly limited, and is two or more. can do. However, if the quantity of the first and second engagement protrusions 33 and 34 is increased, a space for meshing them is required, and the length in the circumferential direction of the first and second engagement protrusions 33 and 34 is correspondingly increased. Shorter.

一方、第１及び第２係合突起３３、３４が２つの場合には、回転駆動力の安定を十分に確保できないおそれがある。従って、第１及び第２係合突起３３、３４の数量は、例えばかかる観点を考慮して設定することができ、３つ以上が好ましく、３つとすることがさらに好ましい。   On the other hand, when there are two first and second engaging protrusions 33 and 34, there is a possibility that sufficient stability of the rotational driving force cannot be ensured. Accordingly, the quantity of the first and second engaging protrusions 33 and 34 can be set in consideration of such a viewpoint, for example, and is preferably three or more, and more preferably three.

その他、本発明は上記実施形態に限定されず、本発明の趣旨を逸脱しない範囲で種々の変更が可能である。例えば、上記実施形態では、本発明の回転駆動部材を、中間転写ベルト８が架け渡され、中間転写ベルト８を回動させるための駆動ローラ１１に適用したため、中間転写ベルトの回動精度を高めることができるが、駆動モータ２７の回転駆動力を伝達可能であれば、回転駆動部材は特に限定されず、その他例えば、感光体ドラム１ａ〜１ｄ等に適用することもできる。   In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, in the above-described embodiment, the rotation driving member of the present invention is applied to the driving roller 11 for rotating the intermediate transfer belt 8 around the intermediate transfer belt 8, thereby improving the rotation accuracy of the intermediate transfer belt. However, as long as the rotational driving force of the drive motor 27 can be transmitted, the rotational driving member is not particularly limited, and can be applied to, for example, the photosensitive drums 1a to 1d.

また、本発明は、高精度な回転駆動力の伝達を要する回転駆動部材に適用する際に、特に有効である。また、本実施形態では、第１及び第２カップリング３１、３２を樹脂材料から形成したため、ねじれ易い材質を用いた場合であっても、第１及び第２カップリング３１、３２のねじれの発生を防止することができる。しかし、かかる材質は特に限定されるものではなく、その他、金属材料とすることもできる。   In addition, the present invention is particularly effective when applied to a rotational drive member that requires a highly accurate rotational drive force transmission. Further, in the present embodiment, since the first and second couplings 31 and 32 are formed from a resin material, the first and second couplings 31 and 32 are twisted even when a material that is easily twisted is used. Can be prevented. However, the material is not particularly limited, and may be a metal material.

また、本発明は、画像形成部を複数備えたタンデム方式のカラー画像形成装置のみならず、モノクロ画像形成装置、或いは直接転写方式の画像形成装置、ファクシミリ等の他の画像形成装置にも適用できる。   The present invention can be applied not only to a tandem color image forming apparatus having a plurality of image forming units, but also to other image forming apparatuses such as a monochrome image forming apparatus, a direct transfer type image forming apparatus, and a facsimile. .

本発明は、第１及び第２のカップリングに、円盤状の底面部と、該底面部の外周縁に沿って且つ回転軸のスラスト方向に突出する壁部と、を形成し、係合突起を、底面部における壁部の内側に周方向に沿って等間隔に複数配置し、底面部からスラスト方向に壁部よりも突出させ、且つ、係合突起の外側面における底面部側が壁部の内側面と一体に形成したものである。   According to the present invention, the first and second couplings are formed with a disk-shaped bottom surface portion and a wall portion projecting in the thrust direction of the rotating shaft along the outer peripheral edge of the bottom surface portion. Are arranged at equal intervals along the circumferential direction on the inner side of the wall portion in the bottom surface portion, protrude from the bottom surface in the thrust direction more than the wall portion, and the bottom surface portion side of the outer surface of the engagement projection is the wall portion. It is formed integrally with the inner surface.

これにより、カップリングの剛性を高め、係合突起のねじれを防止すると共に回転駆動力の伝達を安定させることができるため、省スペース化にも十分に対応することができる。   As a result, the rigidity of the coupling can be increased, the engagement protrusions can be prevented from being twisted, and the transmission of the rotational driving force can be stabilized.

また、底面部の中央部に、回転軸が嵌合するボス部を形成し、係合突起の内側面における底面部側をボス部と一体に形成することによって、カップリングの剛性をより高め、係合突起のねじれをより防止すると共に回転駆動力の伝達をより安定させることができる。また、壁部の先端部を、スラスト方向とは垂直面となるように形成し、係合突起が係合するとき垂直面同士が当接することによって係合突起の係合をより安定させること等ができる。また、壁部に対する係合突起の突出長さを、底面部に対する壁部の突出長さと略同じとすることによって、係合突起の係合をより安定させること等ができる。   In addition, by forming a boss part into which the rotation shaft is fitted at the center part of the bottom part, and forming the bottom part side on the inner side surface of the engaging projection integrally with the boss part, the rigidity of the coupling is further increased. It is possible to further prevent the engagement protrusion from being twisted and to stabilize the transmission of the rotational driving force. In addition, the front end of the wall portion is formed to be a vertical surface with respect to the thrust direction, and the engagement of the engaging protrusions is further stabilized by the vertical surfaces abutting when the engaging protrusions are engaged. Can do. Further, by making the protruding length of the engaging protrusion with respect to the wall portion substantially the same as the protruding length of the wall portion with respect to the bottom surface portion, the engagement of the engaging protrusion can be further stabilized.

また、第１の係合突起の周方向両端部に、回転方向下流側に向かって傾斜する傾斜面と、第２の係合突起の周方向両端部に、回転方向上流側に向かって傾斜する傾斜面と、を形成し、第１のカップリングの回転時、第１の係合突起の回転方向下流側の第１の傾斜面が、第２の係合突起の回転方向上流側の第２の傾斜面と面接触することによって、係合突起間に引き込み力が発生するため、係合をより安定させ、カップリングの抜けを防止すると共に調芯作用を発揮させること等もできる。   Moreover, the inclined surface which inclines toward the rotation direction downstream in the circumferential direction both ends of the 1st engagement protrusion, and it inclines toward the rotation direction upstream in the circumferential direction both ends of the 2nd engagement protrusion. And the first inclined surface on the downstream side in the rotational direction of the first engaging projection is the second upstream side in the rotational direction of the second engaging projection when the first coupling rotates. Since the pulling force is generated between the engaging projections by surface contact with the inclined surface, the engagement can be further stabilized, the coupling can be prevented from coming off, and the alignment function can be exhibited.

また、回転駆動部材を、中間転写ベルトが架け渡され、中間転写ベルトを回動させるための駆動ローラとすることによって、中間転写ベルトの回動精度を高めることができる。また、上記駆動伝達機構を備えた画像形成装置とすることによって、回転駆動力の伝達が安定した良好な画像形成を行うことができる。   In addition, by using the rotation drive member as a drive roller for suspending the intermediate transfer belt and rotating the intermediate transfer belt, the rotation accuracy of the intermediate transfer belt can be improved. Further, by using the image forming apparatus including the drive transmission mechanism, it is possible to perform good image formation with stable transmission of the rotational driving force.

８ 中間転写ベルト
１１ 駆動ローラ（回転駆動部材）
１１ａ 回転軸
２３ 平行ピン
２７ 駆動モータ（駆動手段）
２７ａ 回転軸
３０ 駆動伝達機構
３１ 第１カップリング（第１のカップリング）
３１ａ 底面部
３１ｂ 壁部
３１ｃ ボス部
３１ｄ 穴部
３２ 第２カップリング（第２のカップリング）
３２ａ 底面部
３２ｂ 壁部
３２ｃ ボス部
３２ｄ 穴部
３３ 第１係合突起（第１の係合突起）
３３ａ 第１傾斜面（第１の傾斜面）
３３ｂ 第２傾斜面
３４ 第２係合突起（第２の係合突起）
３４ａ 第３傾斜面（第２の傾斜面）
３４ｂ 第４傾斜面
１００ 画像形成装置
Ｇ１、Ｇ２ 隙間 8 Intermediate transfer belt 11 Drive roller (rotation drive member)
11a Rotating shaft 23 Parallel pin 27 Drive motor (drive means)
27a Rotating shaft 30 Drive transmission mechanism 31 First coupling (first coupling)
31a Bottom part 31b Wall part 31c Boss part 31d Hole part 32 2nd coupling (2nd coupling)
32a Bottom part 32b Wall part 32c Boss part 32d Hole part 33 1st engagement protrusion (1st engagement protrusion)
33a First inclined surface (first inclined surface)
33b Second inclined surface 34 Second engagement protrusion (second engagement protrusion)
34a Third inclined surface (second inclined surface)
34b Fourth inclined surface 100 Image forming apparatus G1, G2 Gap

Claims (7)

駆動手段及び回転駆動部材の回転軸に装着される第１及び第２のカップリングを有し、
前記第１及び第２のカップリングに形成された係合突起が係合することにより前記駆動手段の所定の回転方向への回転駆動力を前記回転駆動部材に伝達する駆動伝達機構であって、
前記第１及び第２のカップリングには、円盤状の底面部と、該底面部の外周縁に沿って且つ前記回転軸のスラスト方向に突出する壁部と、が形成され、
前記係合突起は、前記底面部における前記壁部の内側に周方向に沿って等間隔に複数配置され、前記底面部から前記スラスト方向に前記壁部よりも突出し、且つ、前記係合突起の外側面における前記底面部側が前記壁部の内側面と一体に形成され、
前記壁部に対する前記係合突起の突出長さは、前記底面部に対する前記壁部の突出長さと略同じであることを特徴とする駆動伝達機構。 Having first and second couplings mounted on the rotating shafts of the driving means and the rotary driving member;
A drive transmission mechanism for transmitting a rotational driving force in a predetermined rotational direction of the driving means to the rotational driving member by engaging engagement protrusions formed on the first and second couplings;
The first and second couplings are formed with a disk-shaped bottom surface portion and a wall portion protruding in the thrust direction of the rotating shaft along the outer peripheral edge of the bottom surface portion,
A plurality of the engaging protrusions are arranged at equal intervals along the circumferential direction inside the wall portion in the bottom surface portion, protrude from the bottom surface portion in the thrust direction than the wall portion, and the engaging protrusions The bottom surface side of the outer surface is formed integrally with the inner surface of the wall ,
The drive transmission mechanism according to claim 1, wherein a protruding length of the engaging protrusion with respect to the wall portion is substantially the same as a protruding length of the wall portion with respect to the bottom surface portion . 前記底面部の中央部には、前記回転軸が嵌合するボス部が形成され、前記係合突起の内側面における前記底面部側が前記ボス部と一体に形成されることを特徴とする請求項１に記載の駆動伝達機構。   The center portion of the bottom surface portion is formed with a boss portion into which the rotation shaft is fitted, and the bottom surface portion side of the inner surface of the engagement protrusion is formed integrally with the boss portion. The drive transmission mechanism according to 1. 前記壁部の先端部が、前記スラスト方向とは垂直面となるように形成され、前記係合突起が係合するとき前記垂直面同士が当接することを特徴とする請求項１または２に記載の駆動伝達機構。   The front end portion of the wall portion is formed so as to be a vertical surface with respect to the thrust direction, and the vertical surfaces are in contact with each other when the engagement protrusion is engaged. Drive transmission mechanism. 前記第１のカップリングに形成された第１の係合突起の前記周方向両端部に、前記回転方向下流側に向かって傾斜する傾斜面と、
前記第２のカップリングに形成された第２の係合突起の前記周方向両端部に、前記回転方向上流側に向かって傾斜する傾斜面と、が形成され、
前記第１のカップリングの回転時、前記第１の係合突起の前記回転方向下流側の第１の傾斜面が、前記第２の係合突起の前記回転方向上流側の第２の傾斜面と面接触することを特徴とする請求項１〜３のいずれかに記載の駆動伝達機構。 Inclined surfaces that incline toward the downstream side in the rotational direction at both ends in the circumferential direction of the first engagement protrusion formed on the first coupling,
An inclined surface that is inclined toward the upstream side in the rotational direction is formed at both ends in the circumferential direction of the second engagement protrusion formed in the second coupling,
When the first coupling is rotated, the first inclined surface on the downstream side in the rotational direction of the first engaging protrusion is the second inclined surface on the upstream side in the rotational direction of the second engaging protrusion. drive transmission mechanism according to any one of claims 1 to 3, characterized in that surface contact with. 傾斜面の傾きが外周の方がさらに傾いていることを特徴とする請求項４に記載の駆動伝達機構。5. The drive transmission mechanism according to claim 4, wherein the inclination of the inclined surface is further inclined toward the outer periphery. 第１の係合突起と第２の係合突起の厚みが略同じことを特徴とする請求項５に記載の駆動伝達機構。The drive transmission mechanism according to claim 5, wherein the first engagement protrusion and the second engagement protrusion have substantially the same thickness. 請求項１〜６のいずれかに記載された駆動伝達機構を備えた画像形成装置。   An image forming apparatus comprising the drive transmission mechanism according to claim 1.
JP2009290977A 2009-12-22 2009-12-22 Drive transmission mechanism and image forming apparatus having the same Expired - Fee Related JP5268879B2 (en)

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