JP2016004236A - Belt drive device and image forming apparatus - Google Patents
Belt drive device and image forming apparatus Download PDFInfo
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- JP2016004236A JP2016004236A JP2014126351A JP2014126351A JP2016004236A JP 2016004236 A JP2016004236 A JP 2016004236A JP 2014126351 A JP2014126351 A JP 2014126351A JP 2014126351 A JP2014126351 A JP 2014126351A JP 2016004236 A JP2016004236 A JP 2016004236A
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Abstract
Description
本発明は、無端ベルトを周回可能に備えたベルト駆動装置、及びこのベルト駆動装置を備えた画像形成装置に関する。 The present invention relates to a belt driving device provided with an endless belt so as to be able to circulate, and an image forming apparatus provided with the belt driving device.
画像形成装置に用いられる一次転写ベルトは、転写されたトナー像を下流側で記録用紙に転写するものであるため、画像品質を維持する観点からベルト周回中の蛇行は規制する必要がある。一次転写ベルトの蛇行対策として、ベルトの両端やベルトに張り付けたビード側面等を強制的にガイドして蛇行を規制するもの、またベルト端部に接触するカラー部材をベルトの蛇行によりスラスト方向に移動させ、これにより従動ローラを傾かせるようにして蛇行を抑制するものが知られている。 Since the primary transfer belt used in the image forming apparatus transfers the transferred toner image onto a recording sheet on the downstream side, it is necessary to regulate meandering around the belt from the viewpoint of maintaining image quality. As a countermeasure for meandering of the primary transfer belt, the belt is forcibly guided by regulating both ends of the belt and the side surfaces of the beads attached to the belt, and the collar member that contacts the belt end is moved in the thrust direction by the meandering of the belt. Thus, there is known one that suppresses meandering by tilting the driven roller.
例えば特許文献1には、転写ベルトを張設して周回させる支持ローラの両端にベルト端と当接する拡径部材(カラー部材)を設け、ベルトが蛇行すると、その時の当接力で押されて支持ローラをスラスト方向に移動させ、一方、この移動長に応じた反力を与える付勢機構を両端に採用して、支持ローラの移動側では反力を強め、反対側では反力を弱めるようにして、両側に発生する反力をバランスさせるように蛇行を規制するベルト駆動装置が記載されている。 For example, in Patent Document 1, a diameter-expanding member (collar member) that abuts the belt end is provided at both ends of a support roller that stretches and circulates a transfer belt, and when the belt meanders, it is pushed and supported by the abutment force at that time. The roller is moved in the thrust direction, and on the other hand, an urging mechanism that applies a reaction force according to this movement length is adopted at both ends so that the reaction force is strengthened on the moving side of the support roller and the reaction force is weakened on the opposite side. Thus, there is described a belt driving device that regulates meandering so as to balance reaction forces generated on both sides.
特許文献1に記載のベルト駆動装置は、蛇行規制用の構造が複雑であり、装置の大型化及び高コストを招くという課題がある。 The belt drive device described in Patent Document 1 has a complicated structure for restricting meandering, and there is a problem in that the device is increased in size and cost.
ところで、ベルトの両端縁を利用して蛇行の規制を行う構造として、ベルトを張架する支持ローラの両端に規制用のガイド付きカラー部材を設けるものが知られているが、カラー部材が回転する構造であるため、カラー部材に対してベルトの進入時及び退出時にベルト端縁とカラー部材の内壁とが摺擦し、ベルト端縁にダメージを与える虞がある。特許文献1に記載の装置の場合、ベルトの蛇行は規制し得るものの、ベルトの両端は常に拡径部材に接触しているため、前記摺擦に起因するダメージ発生の問題は考慮されていない。 By the way, as a structure for restricting meandering by using both end edges of the belt, there is known a structure in which a collar member with a guide for restriction is provided at both ends of a support roller that stretches the belt, but the collar member rotates. Due to the structure, the belt edge and the inner wall of the collar member may rub against each other when the belt enters and leaves the collar member, and the belt edge may be damaged. In the case of the apparatus described in Patent Document 1, although the meandering of the belt can be regulated, the both ends of the belt are always in contact with the diameter-expanding member, so that the problem of damage caused by the rubbing is not considered.
本発明は、上記課題を解決するもので、ベルトの端縁へのダメージを抑制するベルト駆動装置及び画像形成装置を提供するものである。 SUMMARY An advantage of some aspects of the invention is to provide a belt driving device and an image forming apparatus that suppress damage to the edge of the belt.
本発明は、複数の支持ローラに所定の張力で掛け渡されて周回する無端ベルトを備えたベルト駆動装置において、少なくとも1つの前記支持ローラの軸方向端部の外方で支持軸に回転可能に軸支され、前記無端ベルトの蛇行を規制するカラー部材を備え、前記支持軸は、前記カラー部材の回転軸の外側を、前記少なくとも1つの前記支持ローラの軸方向に対して当該支持ローラと前記無端ベルトとが接触する方向に傾けた姿勢で支持することを特徴とするものである。 The present invention provides a belt driving device including an endless belt that is wound around a plurality of support rollers with a predetermined tension and rotates around a support shaft outside an end portion in the axial direction of at least one of the support rollers. A collar member that is pivotally supported and restricts meandering of the endless belt, and the support shaft is disposed on an outer side of a rotation shaft of the collar member with respect to the axial direction of the at least one support roller and the support roller; It supports in the attitude | position inclined in the direction which contacts an endless belt.
本発明によれば、無端ベルトの進入部位においてカラー部材との間に隙間が形成されるので、無端ベルトは、進入に応じて、その端縁がカラー部材の内側面に徐々に近づくようになる。従って、無端ベルトの端縁とカラー部材の内側との擦れ合いが解消されるので、ダメージの発生が防がれる。 According to the present invention, since a gap is formed between the end portion of the endless belt and the collar member, the end edge of the endless belt gradually approaches the inner surface of the collar member as the endless belt enters. . Therefore, the rubbing between the end edge of the endless belt and the inside of the collar member is eliminated, so that the occurrence of damage is prevented.
また、前記支持ローラは円筒であり、前記支持軸は、前記支持ローラ及び前記カラー部材を各軸受を介して外嵌すると共に両端で側壁に支持されてなり、かつ前記無端ベルトからの前記所定の張力を受けて弾性変形可能な構造を有するものである。この構成によれば、無端ベルトの張力(テンション)を利用して支持軸が無端ベルト側に弾性変形される。すなわち、カラー部材の回転軸の外側は、支持ローラと前記無端ベルトとが接触する方向に傾いた姿勢となり、その結果、前記のように無端ベルトの進入部位においてカラー部材との間に隙間が形成される。 Further, the support roller is a cylinder, and the support shaft is formed by externally fitting the support roller and the collar member via respective bearings and supported by side walls at both ends, and the predetermined end from the endless belt. It has a structure that can be elastically deformed under tension. According to this configuration, the support shaft is elastically deformed toward the endless belt using the tension of the endless belt. That is, the outer side of the rotation shaft of the collar member is inclined in the direction in which the support roller and the endless belt are in contact with each other, and as a result, a gap is formed between the end of the endless belt and the collar member as described above. Is done.
また、前記支持ローラは円筒であり、前記支持軸は、前記支持ローラ及び前記カラー部材を各軸受を介して外嵌すると共に両端で側壁に支持されてなり、かつ前記カラー部材の軸受の位置で前記傾けた方向に屈曲されていることを特徴とする。この構成によれば、屈曲部位の作成が容易となる。 The support roller is a cylinder, and the support shaft is externally fitted to the support roller and the collar member via respective bearings and is supported by side walls at both ends, and at the position of the bearing of the collar member. It is bent in the inclined direction. According to this configuration, it is easy to create a bent portion.
また、前記カラー部材は、前記支持軸に自動調芯軸受を介して取り付けられ、 前記自動調芯軸受は、軸方向の外方側が前記少なくとも1つの前記支持ローラと前記無端ベルトとが接触範囲内の一方向に傾けた姿勢で側壁に支持されていることを特徴とする。この構成によれば、前記した無端ベルトの進入部位におけるカラー部材との間の隙間が容易に形成される。 The collar member is attached to the support shaft via an automatic alignment bearing, and the automatic alignment bearing has an axially outer side in which the at least one support roller and the endless belt are in a contact range. It is supported by the side wall in a posture inclined in one direction. According to this configuration, the gap between the end portion of the endless belt and the collar member is easily formed.
請求項1〜5のいずれかに記載のベルト駆動装置を備えた画像形成装置。この構成によれば、無端ベルトの端縁にダメージの生じないベルト駆動装置を備えた画像形成装置が提供できる。 An image forming apparatus comprising the belt driving device according to claim 1. According to this configuration, it is possible to provide an image forming apparatus including a belt driving device that does not cause damage to the edge of the endless belt.
本発明によれば、無端ベルトの端縁のカラー部材の内側との擦れ合いを解消し、ダメージの発生を防止することができる。 According to the present invention, it is possible to eliminate rubbing between the edge of the endless belt and the inside of the collar member, and to prevent occurrence of damage.
図1に示すように、画像形成装置100は、画像形成部10、中間転写部20、二次転写部30、定着部40、給紙部50、用紙搬送路60及び読取部70を備えると共に、装置本体の上部に自動原稿搬送装置80が搭載されている。画像形成装置100は、原稿から読み取った画像データあるいは図外の外部装置から入力された画像データを用紙に多色又は単色の画像形成処理を行う。 As shown in FIG. 1, the image forming apparatus 100 includes an image forming unit 10, an intermediate transfer unit 20, a secondary transfer unit 30, a fixing unit 40, a paper feeding unit 50, a paper conveyance path 60, and a reading unit 70. An automatic document feeder 80 is mounted on the upper part of the apparatus main body. The image forming apparatus 100 performs multi-color or single-color image forming processing on image data read from a document or image data input from an external device (not shown).
画像形成部10は、光ビーム走査ユニット1及びそれぞれ同様な構造を有する各色の画像形成部10A〜10Dを備えている。光ビーム走査ユニット1は、筐体を有し、その内部に色毎に必要な光学部品が配置されている。光ビーム走査ユニット1は、読取部70で読み取られた、原稿に対応するR、G、B色の画像データをブラック(K)、シアン(C)、マゼンタ(M)、イエロー(Y)の色情報に変換し、変換後の各色の画像データによって変調されたレーザ光で画像形成部10A〜10Dの感光体ドラム2A〜2Dの表面を軸方向(主走査方向)に沿って露光走査して、それぞれの静電潜像を形成する。代表して説明する画像形成部10Aは、感光体ドラム2Aを備え、その周囲に回転方向(副走査方向)に沿って帯電器3A、現像器4A及びクリーナ部5Aを備えている。 The image forming unit 10 includes the light beam scanning unit 1 and image forming units 10 </ b> A to 10 </ b> D for each color having the same structure. The light beam scanning unit 1 has a housing, and necessary optical components for each color are arranged therein. The light beam scanning unit 1 converts R, G, and B color image data read by the reading unit 70 into black (K), cyan (C), magenta (M), and yellow (Y) colors. The surface of the photosensitive drums 2A to 2D of the image forming units 10A to 10D is exposed and scanned along the axial direction (main scanning direction) with laser light that is converted into information and modulated by the image data of each color after conversion, Each electrostatic latent image is formed. The image forming unit 10A, which is representatively described, includes a photosensitive drum 2A, and includes a charger 3A, a developing unit 4A, and a cleaner unit 5A along the rotation direction (sub-scanning direction).
中間転写部20は、無端の転写ベルト21、駆動ローラ22、従動ローラ23、一次転写ローラ24A〜24Dを備えて、感光体ドラム2A〜2Dの周面に形成されたトナー像を転写ベルト21の表面に一次転写する。転写ベルト21は、互いに平行配置された支持ローラである駆動ローラ22と従動ローラ23との間に掛け渡されると共に、その間に配置された所要数の支持ローラによって所定の張力が付与された状態で周回可能にされている。 The intermediate transfer unit 20 includes an endless transfer belt 21, a driving roller 22, a driven roller 23, and primary transfer rollers 24 </ b> A to 24 </ b> D, and transfers toner images formed on the peripheral surfaces of the photosensitive drums 2 </ b> A to 2 </ b> D to the transfer belt 21. Primary transfer to the surface. The transfer belt 21 is stretched between a driving roller 22 and a driven roller 23, which are support rollers arranged in parallel with each other, and a predetermined tension is applied by a required number of support rollers arranged therebetween. It is possible to go around.
二次転写部30は、転写ベルト21の表面のトナー像を記録用紙へ二次転写する。定着部40は、記録用紙に転写されたトナー像を加熱して定着し、排紙トレイに排出する。給紙部50は、給紙カセットや手差しトレイを備えており、選択された記録用紙を、対応する給紙カセットから用紙搬送路60に給紙する。 The secondary transfer unit 30 secondarily transfers the toner image on the surface of the transfer belt 21 onto a recording sheet. The fixing unit 40 heats and fixes the toner image transferred to the recording paper, and discharges it to a paper discharge tray. The paper feed unit 50 includes a paper feed cassette and a manual feed tray, and feeds the selected recording paper from the corresponding paper feed cassette to the paper transport path 60.
中間転写部20において、図2に示すように、転写ベルト21は、転写するトナー像の最大サイズ(例えばA3サイズの場合、297mm)に対応する幅寸法を有し、駆動ローラ22及び従動ローラ23を含む支持ローラによって周回動作される。駆動ローラ22及び従動ローラ23を含む支持ローラの軸方向両側には、板状の側壁部材261,262が対向配置されている。側壁部材261,262は、駆動ローラ22、従動ローラ23を含む支持ローラの両端を支持する。また、側壁部材262には駆動ローラ22の駆動源たるモータ(図では見えていない)が取り付けられている。カバー部材263は側壁部材262の外部側を覆うものである。 As shown in FIG. 2, in the intermediate transfer unit 20, the transfer belt 21 has a width corresponding to the maximum size of a toner image to be transferred (for example, 297 mm in the case of A3 size), and has a driving roller 22 and a driven roller 23. Is rotated by a support roller including On both sides in the axial direction of the support roller including the driving roller 22 and the driven roller 23, plate-like side wall members 261 and 262 are disposed to face each other. The side wall members 261 and 262 support both ends of the support roller including the driving roller 22 and the driven roller 23. The side wall member 262 is attached with a motor (not shown) as a drive source of the drive roller 22. The cover member 263 covers the outside of the side wall member 262.
図3及び図4(a)に示すように、従動ローラ23は円筒形状を有する。従動ローラ23は、中心に円柱状の支持軸231を備え、軸受232を介して回動可能に軸支されている。支持軸231は、側壁部材261,262に支持されている。なお、ここでは、支持軸231は回転が規制された態様が採用されている。従動ローラ23の両端外側には、円板状のカラー部材25が軸受251を介して支持軸231に回転可能に支持されている。カラー部材25は、従動ローラ23の半径に比して大きい半径を有し、拡径部を形成している。カラー部材25は、転写ベルト21が蛇行を生じるとき、転写ベルト21の幅方向端縁が拡径部の内側面に当接することで蛇行の規制を行う。 As shown in FIGS. 3 and 4A, the driven roller 23 has a cylindrical shape. The driven roller 23 includes a cylindrical support shaft 231 at the center, and is rotatably supported via a bearing 232. The support shaft 231 is supported by the side wall members 261 and 262. Here, the support shaft 231 adopts a mode in which rotation is restricted. A disc-shaped collar member 25 is rotatably supported on the support shaft 231 via a bearing 251 on both outer sides of the driven roller 23. The collar member 25 has a larger radius than the radius of the driven roller 23 and forms an enlarged diameter portion. When the transfer belt 21 meanders, the color member 25 regulates meandering by causing the edge in the width direction of the transfer belt 21 to contact the inner surface of the enlarged diameter portion.
従動ローラ23は、転写ベルト21の張力程度では変形しない堅牢な材料、寸法が選定されており、例えば、材料としては硬質ゴム又は金属等が採用され、寸法としては軸直径数十mm、例えば25mmが採用されている。一方、支持軸231はSUS等の鋼材で製造され、軸に交差する方向への変形を阻止する場合には直径8mm程度が必要な寸法として一般的であるが、ここでは所定の弾性変形(撓み)を生じさせる目的から直径5〜7mmが採用されている。径を細くすることに代えて、より弾性を有する材料を採用してもよい。なお、図4(a)及び後述する図6では、軸方向(図の上下方向)の寸法が、説明の便宜上、実際に比して短めに示されている。 The driven roller 23 is selected from robust materials and dimensions that do not deform with the tension of the transfer belt 21. For example, hard rubber or metal is used as the material, and the shaft diameter is several tens of millimeters, for example, 25 mm. Is adopted. On the other hand, the support shaft 231 is made of a steel material such as SUS, and when the deformation in the direction crossing the shaft is to be prevented, the support shaft 231 is generally a required dimension of about 8 mm in diameter. ) Is used for the purpose of generating a). Instead of reducing the diameter, a more elastic material may be employed. In FIG. 4A and FIG. 6 to be described later, the dimension in the axial direction (vertical direction in the figure) is shown shorter than the actual size for convenience of explanation.
図4(b)は、支持軸231が弾性変形した状態を示している。支持軸231は、張設された転写ベルト21からの張力を、軸に直交する方向に受けて弾性変形し、本来の軸方向Oに対して角度θだけ傾いた状態にある。角度θは、後述する擦れ合いを解消するためのもので、例えば実験を経て設定され、0.数度〜数度程度が好ましい。なお、従動ローラ23は、その堅牢性から変形せず、また軸受232は、角度θ程度の傾きに対して従動ローラ23の回転に支障を生じさせない。カラー部材25の周縁は、角度θの傾きの発生によって、矢印Dbiで示す転写ベルト21の進入側が、角度θに対応した角度分だけ外側(図中、上方)に変位して、その間に隙間25aが形成されている。すなわち、カラー部材25は、転写ベルト21の進入側(退出側も同様)が外側に開き、一方、反対側は内側に狭まる向きに変位する。この結果、図5で説明するように、カラー部材25に対する転写ベルト21の接触動作が影響を受ける。 FIG. 4B shows a state where the support shaft 231 is elastically deformed. The support shaft 231 is elastically deformed by receiving the tension from the tensioned transfer belt 21 in a direction perpendicular to the shaft, and is inclined by an angle θ with respect to the original axial direction O. The angle θ is for eliminating rubbing, which will be described later, and is set, for example, through an experiment. Several degrees to several degrees is preferable. The driven roller 23 is not deformed due to its robustness, and the bearing 232 does not hinder the rotation of the driven roller 23 with respect to the inclination of the angle θ. The peripheral edge of the collar member 25 is displaced outward (upward in the figure) by an angle corresponding to the angle θ, and the gap 25a is interposed between the entrance side of the transfer belt 21 indicated by the arrow Dbi due to the occurrence of the inclination of the angle θ. Is formed. That is, the color member 25 is displaced in a direction in which the entrance side (the same as the exit side) of the transfer belt 21 opens outward, while the opposite side narrows inward. As a result, as described in FIG. 5, the contact operation of the transfer belt 21 with respect to the collar member 25 is affected.
図5(a)において、今、中心Oで示す支持軸231が変形して(傾いて)いないと想定した場合、転写ベルト21は、進入方向Dbiからカラー部材25に進入すると、まず転写ベルト21の端縁がカラー部材25の内側面に接触する。次いで、転写ベルト21は、点Piで従動ローラ23の外周に巻き付き、一体回転して点Poまで進んだ後、従動ローラ23の外周から離間して退出方向Dboに退出する。進入時に着目すると、転写ベルト21の部位の内、カラー部材25への進入開始位置から点Piまでの部位は、カラー部材25と接触することとになる。ところで、例えば、進入開始位置では、カラー部材25は周方向Dciに回転しているため、転写ベルト21の進入方向Dbiとは差φで交差する。したがって、点Piに到達するまでの間、転写ベルト21の端縁は、カラー部材25の内側面と擦れ合う(摺擦)状態にあり、転写ベルト21の端縁及びその周辺部位にダメージ(損傷)を与えかねない。また、かかる擦れ合い状態は、点Pi〜Poで転写ベルト21の周回方向とカラー部材25の回転方向が一致した一体回転時は解消される一方、点Poから退出位置まで、同様に擦れ合う状態となる。 In FIG. 5A, when it is assumed that the support shaft 231 indicated by the center O is not deformed (tilted) now, when the transfer belt 21 enters the collar member 25 from the entry direction Dbi, first, the transfer belt 21 is transferred. Of the collar member 25 contacts the inner surface of the collar member 25. Next, the transfer belt 21 is wound around the outer periphery of the driven roller 23 at the point Pi, rotates integrally to advance to the point Po, and then moves away from the outer periphery of the driven roller 23 in the retracting direction Dbo. When paying attention when entering, the part of the transfer belt 21 from the entry start position to the color member 25 to the point Pi is in contact with the color member 25. By the way, for example, since the collar member 25 rotates in the circumferential direction Dci at the approach start position, it intersects the approach direction Dbi of the transfer belt 21 with a difference φ. Therefore, until the point Pi is reached, the end edge of the transfer belt 21 is in a state of rubbing (sliding) with the inner surface of the collar member 25, and the end edge of the transfer belt 21 and its peripheral portion are damaged (damaged). May give. The rubbing state is canceled at the time of integral rotation in which the rotation direction of the transfer belt 21 and the rotation direction of the collar member 25 coincide with each other at points Pi to Po, while the rubbing state similarly occurs from the point Po to the retracted position. Become.
そこで、図5(b)に示すように、カラー部材25を、支持軸231の傾き角度θに対応する角度θだけ傾けて隙間25aを形成し、転写ベルト21が、カラー部材25に進入して点Piに達するまでの間、及び点Poから退出するまでの間、カラー部材25の内側面と、進入時に徐々に近づき、あるいは退出時に徐々に離れるように、すなわち接触しないようにした。このようにすることで、転写ベルト21とカラー部材25との擦れ合いが解消されることになる。 Therefore, as shown in FIG. 5B, the collar member 25 is inclined by an angle θ corresponding to the inclination angle θ of the support shaft 231 to form a gap 25a, and the transfer belt 21 enters the collar member 25. The inner surface of the collar member 25 is gradually approached at the time of entry, or is gradually separated at the time of exit, that is, not to contact, until the point Pi is reached and until the point Po is retreated. By doing so, friction between the transfer belt 21 and the collar member 25 is eliminated.
図6(a)は第2実施形態を示すもので、支持軸231を弾性変形させることに代えて、カラー部材25を軸支する軸受として自動調芯軸受252を採用している。自動調芯軸受252の内輪側は、支持部材2611によって側壁部材261に支持されている。支持部材2611は、例えば円筒状の筒体で、カラー部材25と対向する頂面が角度θを有する斜面に形成され、この頂面で自動調芯軸受252を支持して、カラー部材25を回転可能にしている。従って、カラー部材25は、図5(b)と同様に傾斜状態に維持され、転写ベルト21との擦れ合いが解消される。 FIG. 6A shows a second embodiment. Instead of elastically deforming the support shaft 231, an automatic centering bearing 252 is adopted as a bearing for supporting the collar member 25. The inner ring side of the self-aligning bearing 252 is supported on the side wall member 261 by a support member 2611. The support member 2611 is, for example, a cylindrical tube, and the top surface facing the collar member 25 is formed on a slope having an angle θ. It is possible. Accordingly, the collar member 25 is maintained in an inclined state as in FIG. 5B, and the friction with the transfer belt 21 is eliminated.
図6(b)は第3実施形態を示すもので、支持軸231を弾性変形させることに代えて、支持軸231の内、従動ローラ23を軸支する軸受232の外側の部分で屈曲して、図5(b)と同様の角度θの傾きを有する屈曲部2311を形成している。これによって、カラー部材25は、図5(b)と同様な傾斜が確保され、転写ベルト21との擦れ合いが解消される。これによれば、屈曲部2311が容易に作成できる。 FIG. 6B shows the third embodiment. Instead of elastically deforming the support shaft 231, the support shaft 231 is bent at a portion outside the bearing 232 that supports the driven roller 23. A bent portion 2311 having an inclination of an angle θ similar to that in FIG. 5B is formed. As a result, the collar member 25 is ensured to have the same inclination as in FIG. 5B, and the friction with the transfer belt 21 is eliminated. According to this, the bending part 2311 can be created easily.
なお、以上の各実施形態では、従動ローラ23とカラー部材25とを別部材で構成したので、カラー部材25の構成及び配置が容易となる。また、図6に示す実施形態では、支持軸231に対してカラー部材25を設ける態様としたが、カラー部材25を支持するための支持軸部材を支持軸231とは別体として設けてもよい。例えば、従動ローラ23と外壁部材261との隙間に、支持軸231の外周に遊嵌させ、かつ外壁部材261に立設支持される筒状の支持軸部材を設け、これに軸受を介してカラー部材を設ける態様としてもよい。 In each of the above embodiments, the driven roller 23 and the collar member 25 are configured as separate members, so that the configuration and arrangement of the collar member 25 are facilitated. In the embodiment shown in FIG. 6, the collar member 25 is provided on the support shaft 231. However, the support shaft member for supporting the collar member 25 may be provided separately from the support shaft 231. . For example, in the gap between the driven roller 23 and the outer wall member 261, a cylindrical support shaft member that is loosely fitted on the outer periphery of the support shaft 231 and supported upright on the outer wall member 261 is provided, and a collar is provided via a bearing. It is good also as an aspect which provides a member.
さらに、上記実施形態は、進入方向と退出方向とが、図3に示すように略135度の方向変換を有しているものであるが、これに限定されず、進入方向と退出方向との差は180度(いわゆるUターン)でもよいし、逆に、例えば数十度程度の小さい角度の方向変換であってもよい。この場合、カラー部材25の軸を角度θだけ傾ける方向は、進入点Piと退出点Poの中間点(すなわち進入方向と退出方向の中間)となる方向が好ましいが、これに限定されず、進入点Piと退出点Poとの間における適宜な方向としてもよい。 Further, in the above embodiment, the approach direction and the exit direction have a direction change of approximately 135 degrees as shown in FIG. 3, but the present invention is not limited to this. The difference may be 180 degrees (so-called U-turn), or conversely, for example, a direction change at a small angle of about several tens of degrees. In this case, the direction in which the axis of the collar member 25 is inclined by the angle θ is preferably a direction that is an intermediate point between the entry point Pi and the exit point Po (that is, between the entry direction and the exit direction). An appropriate direction between the point Pi and the exit point Po may be used.
また、本発明は、中間転写部20に限定されず、二次転写部30、定着部40等のようなベルトを周回させてそれぞれ所期の処理を施す装置部分に適用可能である。 In addition, the present invention is not limited to the intermediate transfer unit 20, but can be applied to an apparatus unit that rotates a belt such as the secondary transfer unit 30, the fixing unit 40, etc., and performs an intended process.
また、上述の実施形態の説明は、すべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上述の実施形態ではなく、特許請求の範囲によって示される。さらに、本発明の範囲には、特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 In addition, the description of the above-described embodiment is an example in all respects, and should be considered not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.
100 画像形成装置
20 中間転写部
21 転写ベルト
23 従動ローラ(支持ローラ)
231 支持軸
2311 屈曲部(支持軸)
232,251 軸受
25 カラー部材
261,262 側壁部材(側壁)
252 自動調芯軸受
2611 筒体
DESCRIPTION OF SYMBOLS 100 Image forming apparatus 20 Intermediate transfer part 21 Transfer belt 23 Driven roller (support roller)
231 Support shaft 2311 Bending part (support shaft)
232, 251 Bearing 25 Collar member 261, 262 Side wall member (side wall)
252 Self-aligning bearing 2611 Cylindrical body
Claims (5)
少なくとも1つの前記支持ローラの軸方向端部の外方で支持軸に回転可能に軸支され、前記無端ベルトの蛇行を規制するカラー部材を備え、
前記支持軸は、前記カラー部材の回転軸の外側を、前記少なくとも1つの前記支持ローラの軸方向に対して当該支持ローラと前記無端ベルトとが接触する方向に傾けた姿勢で支持することを特徴とするベルト駆動装置。 In a belt drive device including an endless belt that is wound around a plurality of support rollers with a predetermined tension and circulates,
A collar member rotatably supported on the support shaft outside the axial end of at least one of the support rollers, and regulating the meandering of the endless belt;
The support shaft supports the outer side of the rotation shaft of the collar member in a posture inclined in a direction in which the support roller and the endless belt are in contact with the axial direction of the at least one support roller. Belt drive device.
前記支持軸は、前記支持ローラ及び前記カラー部材を各軸受を介して外嵌すると共に両端で側壁に支持されてなり、かつ前記無端ベルトからの前記所定の張力を受けて弾性変形可能な構造を有するものである請求項1に記載のベルト駆動装置。 The support roller is cylindrical;
The support shaft has a structure in which the support roller and the collar member are externally fitted through respective bearings and supported by side walls at both ends, and can be elastically deformed by receiving the predetermined tension from the endless belt. 2. The belt driving device according to claim 1, wherein the belt driving device is provided.
前記支持軸は、前記支持ローラ及び前記カラー部材を各軸受を介して外嵌すると共に両端で側壁に支持されてなり、かつ前記カラー部材の軸受の位置で前記傾けた方向に屈曲されていることを特徴とする請求項1に記載のベルト駆動装置。 The support roller is cylindrical;
The support shaft is externally fitted to the support roller and the collar member via respective bearings, is supported by side walls at both ends, and is bent in the inclined direction at the position of the bearing of the collar member. 2. The belt driving device according to claim 1, wherein:
前記自動調芯軸受は、軸方向の外方側が前記少なくとも1つの前記支持ローラと前記無端ベルトとが接触範囲内の一方向に傾けた姿勢で側壁に支持されていることを特徴とする請求項1に記載のベルト駆動装置。 The collar member is attached to the support shaft via a self-aligning bearing,
The self-aligning bearing is supported by a side wall in an attitude in which the at least one support roller and the endless belt are inclined in one direction within a contact range on an outer side in the axial direction. The belt drive device according to 1.
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JPH02155513A (en) * | 1988-12-09 | 1990-06-14 | Sumitomo Metal Ind Ltd | Crown roll |
US6594460B1 (en) * | 2002-09-10 | 2003-07-15 | Xerox Corporation | Low force lateral photoreceptor or intermediate transfer belt tracking correction system |
JP2007293258A (en) * | 2006-03-29 | 2007-11-08 | Konica Minolta Business Technologies Inc | Image forming apparatus |
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