JP2008290875A - Belt conveyance device and image forming device - Google Patents

Belt conveyance device and image forming device Download PDF

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JP2008290875A
JP2008290875A JP2007140782A JP2007140782A JP2008290875A JP 2008290875 A JP2008290875 A JP 2008290875A JP 2007140782 A JP2007140782 A JP 2007140782A JP 2007140782 A JP2007140782 A JP 2007140782A JP 2008290875 A JP2008290875 A JP 2008290875A
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meandering
roller
belt
meandering correction
correction roller
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Yoshihiro Ando
由博 安藤
Masuo Kawamoto
益雄 河本
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Kyocera Document Solutions Inc
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Kyocera Mita Corp
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  • Fixing For Electrophotography (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt conveyance device allowing stable travelling of an endless belt and extending the life of the endless belt, and to provide an image forming device. <P>SOLUTION: Expanding members 14, 16 are supported in both ends of a shank 10. The expanding members 14, 16 are shaped in a truncated cone with a tapered surface increasing its diameter toward the outside a driving roller 41, and a part thereof is housed in both ends of an elastic body section 12. Elliptic cams 80, 82 are contacted with the outside end surfaces of the expanding members 14, 16, and the elliptic cams 80, 82 are rotated and driven by cam driving motors 76, 78. When the elliptic cams 80, 82 are rotated and driven, the expanding members 14, 16 are moved inside in the axial direction of the roller against a spring force of a coil spring 18. At positions above both sides of a transfer belt 34, sensors 72, 74 for detecting meandering of the transfer belt 34 are arranged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、搬送ベルトや転写ベルトや定着ベルトなどに用いられるベルト搬送装置およびそのベルト搬送装置を備えた画像形成装置に関する。   The present invention relates to a belt conveyance device used for a conveyance belt, a transfer belt, a fixing belt, and the like, and an image forming apparatus including the belt conveyance device.

無端ベルトはこれを掛け回すローラの組立位置精度等により、稼働中に無端ベルトが所定の位置で回転せず、ローラの軸方向に移動してしまう蛇行という現象が起きる。従って、このような蛇行現象を防止するため、従来より、蛇行を補正する技術が種々提案されている。例えば特許文献１に示されているベルト搬送装置は、ローラ軸端部へ向かって軸の径が大きくなる蛇行補正ローラと、無端ベルトの蛇行を検知するセンサーとを備え、センサーが蛇行を検知すると、蛇行補正ローラをローラ軸方向に移動させて無端ベルトの蛇行を補正するものである。   The endless belt has a meandering phenomenon that the endless belt does not rotate at a predetermined position during operation and moves in the axial direction of the roller due to the assembly position accuracy of the roller around which the endless belt is wound. Therefore, in order to prevent such a meandering phenomenon, various techniques for correcting meandering have been proposed. For example, the belt conveyance device shown in Patent Document 1 includes a meandering correction roller whose diameter increases toward the end of the roller shaft, and a sensor that detects meandering of the endless belt, and when the sensor detects meandering The meandering correction roller is moved in the roller axial direction to correct the meandering of the endless belt.

特開２００１−１４７５５９号公報JP 2001-147559 A

しかし、特許文献１のベルト搬送装置のような蛇行補正機能を有していたとしても、無端ベルトがローラ軸中央部で釣合がとれた状態で安定して走行するように収束することは困難であった。さらに、蛇行補正ローラが、ローラ軸端部へ向かって軸の径が大きくなっている構造のため、無端ベルトの側部に常に曲げストレスがかかる。このため、無端ベルトが劣化し易いという問題があった。   However, even if it has a meandering correction function like the belt conveyance device of Patent Document 1, it is difficult to converge the endless belt so that it travels stably in a balanced state at the center of the roller shaft. Met. Further, since the meandering correction roller has a structure in which the shaft diameter increases toward the roller shaft end, bending stress is always applied to the side of the endless belt. For this reason, there is a problem that the endless belt is easily deteriorated.

それゆえに、本発明の主たる目的は、無端ベルトが安定して走行することができ、かつ、無端ベルトの長寿命化が図れるベルト搬送装置および画像形成装置を提供することである。   SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a belt conveying device and an image forming apparatus in which the endless belt can stably travel and the endless belt can have a long life.

請求項１に係る発明は、軸部と軸部の外周に設けられた弾性体部とを有する蛇行補正ローラと、蛇行補正ローラと共に所定の位置に配置された複数のローラと、蛇行補正ローラおよび複数のローラに掛け回され、循環搬送される無端ベルトと、無端ベルトの蛇行を検知する検知手段と、蛇行補正ローラの両端にそれぞれ設けられ、弾性体部の端部に押し込まれることにより、弾性体部の端部の径を外側に向かって大きくする押し広げ部材と、押し広げ部材をローラ軸方向に駆動する押し広げ部材駆動手段と、検知手段からの検知結果に基づいて、押し広げ部材駆動手段を駆動制御する制御手段と、を備えたことを特徴とする、ベルト搬送装置である。   According to a first aspect of the present invention, there is provided a meandering correction roller having a shaft portion and an elastic body portion provided on an outer periphery of the shaft portion, a plurality of rollers disposed at a predetermined position together with the meandering correction roller, a meandering correction roller, An endless belt that is wound around a plurality of rollers and circulated and transported, a detecting means for detecting meandering of the endless belt, and a meandering correction roller are provided at both ends, and are elastically pressed into the end of the elastic body. A spreading member that increases the diameter of the end of the body toward the outside, a spreading member driving unit that drives the spreading member in the roller axial direction, and a spreading member drive based on the detection result from the detecting unit And a control means for driving and controlling the means.

請求項１の発明では、検知手段によって無端ベルトの蛇行が検知されると、制御手段が押し広げ部材をローラ軸方向に駆動させて蛇行補正ローラに押し込む。これにより、蛇行補正ローラの端部の弾性体部が押し広げられ、蛇行補正ローラはその端部に向かって径が大きくなるように変形する。すなわち、蛇行補正ローラの端部の外周面には、端部に向かって径が大きくなるテーパ面が形成され、このテーパ面によって蛇行が規制される。このとき、無端ベルトの蛇行量が大きくなるにつれて、押し広げ部材の蛇行補正ローラへの押し込み量を増やすことにより、テーパ面の傾斜角度を大きくすることができ、より強い力で蛇行を規制することができ、蛇行の収束も速くできる。   In the first aspect of the invention, when the meandering of the endless belt is detected by the detecting means, the control means drives the spreading member in the roller axial direction and pushes it into the meandering correction roller. As a result, the elastic body portion at the end of the meandering correction roller is expanded, and the meandering correction roller is deformed so that its diameter increases toward the end. That is, a tapered surface having a diameter that increases toward the end portion is formed on the outer peripheral surface of the end portion of the meandering correction roller, and meandering is restricted by the tapered surface. At this time, as the amount of meandering of the endless belt increases, by increasing the pushing amount of the spreading member into the meandering correction roller, the inclination angle of the tapered surface can be increased, and the meandering is regulated with a stronger force. And the convergence of meandering can be done quickly.

また、請求項２に係る発明は、請求項１に係る発明に従属する発明であって、押し広げ部材が、蛇行補正ローラの外側に向かって径が大きくなるテーパ面を有した円錐台形状の部材であることを特徴とする、ベルト搬送装置である。   The invention according to claim 2 is an invention dependent on the invention according to claim 1, wherein the spreading member has a truncated cone shape having a tapered surface whose diameter increases toward the outside of the meandering correction roller. It is a belt conveying apparatus characterized by being a member.

請求項２の発明では、押し広げ部材の構成が簡素であるため、ベルト搬送装置の製造コストが安価である。   In the invention of claim 2, since the structure of the spreading member is simple, the manufacturing cost of the belt conveying device is low.

さらに、請求項３に係る発明は、請求項１または請求項２に記載のベルト搬送装置を備えたことを特徴とする、画像形成装置である。   Furthermore, an invention according to claim 3 is an image forming apparatus comprising the belt conveying device according to claim 1 or 2.

請求項３の発明では、無端ベルトの蛇行を防止できるため、蛇行による無端ベルトのたるみやしわが抑えられ、画像むらなどを低減することができる。   In the invention of claim 3, since the endless belt can be prevented from meandering, sagging and wrinkles of the endless belt due to meandering can be suppressed, and image unevenness can be reduced.

本発明によれば、押し広げ部材をローラ軸方向に駆動させて蛇行補正ローラに押し込むことにより、蛇行補正ローラの端部の弾性体部が押し広げられ、蛇行補正ローラの端部には端部に向かって径が大きくなるテーパ面が形成される。そして、このテーパ面によって蛇行が規制され、無端ベルトの走行を安定したものにできる。また、蛇行補正ローラが他のローラと平行に配置されていなくても、蛇行を補正できる。さらに、蛇行が発生していない通常の状態では、蛇行補正ローラの端部の外周面形状はフラットなので、無端ベルトの側部に余分な負荷がかかることもないため、無端ベルトの長寿命化が可能となる。   According to the present invention, the elastic member at the end of the meandering correction roller is spread by driving the spreading member in the roller axis direction and pushing it into the meandering correction roller. A tapered surface with a diameter increasing toward is formed. And, meandering is restricted by this taper surface, and the endless belt can be made to travel stably. Further, the meandering can be corrected even if the meandering correction roller is not arranged in parallel with the other rollers. Furthermore, in the normal state where no meandering has occurred, the outer peripheral surface shape of the end of the meandering correction roller is flat, so that no extra load is applied to the side of the endless belt. It becomes possible.

本発明の上述の目的、その他の目的、特徴および利点は、図面を参照して行う以下の発明を実施するための最良の形態の説明から一層明らかとなろう。   The above-described object, other objects, features, and advantages of the present invention will become more apparent from the following description of the best mode for carrying out the invention with reference to the drawings.

図１は本発明に係るベルト搬送装置を備えたカラー画像形成装置６８を示す概略構成図である。   FIG. 1 is a schematic configuration diagram showing a color image forming apparatus 68 provided with a belt conveying apparatus according to the present invention.

感光体ドラム２２は駆動手段によって図示矢印の反時計方向に所定速度で駆動される。感光体ドラム２２の外周近傍には、帯電器２４、現像装置２８、転写ベルト３４、摺擦部材３０、クリーニング部材３２が設けられている。感光体ドラム２２は帯電器２４にて表面が帯電される。感光体ドラム２２の回転方向における帯電器２４の下流側には、レーザースキャニングユニット２６が配置されている。レーザースキャニングユニット２６から放射されたレーザ光Ｌは、反射ミラー２７を介して感光体ドラム２２上に照射され、静電潜像が形成される。   The photosensitive drum 22 is driven at a predetermined speed in a counterclockwise direction indicated by an arrow in the drawing by a driving unit. In the vicinity of the outer periphery of the photosensitive drum 22, a charger 24, a developing device 28, a transfer belt 34, a rubbing member 30, and a cleaning member 32 are provided. The surface of the photosensitive drum 22 is charged by a charger 24. A laser scanning unit 26 is disposed on the downstream side of the charger 24 in the rotation direction of the photosensitive drum 22. The laser beam L emitted from the laser scanning unit 26 is irradiated onto the photosensitive drum 22 through the reflection mirror 27, and an electrostatic latent image is formed.

レーザースキャニングユニット２６の下流側には、ロータリー現像装置２８が配置されている。現像装置２８は、回転支持体２９に支持された現像器２８ａ，２８ｂ，２８ｃ，２８ｄを備えている。現像器２８ａ，２８ｂ，２８ｃ，２８ｄは、それぞれマゼンタ、シアン、イエロー、ブラック各色のトナーを感光体ドラム２２に付与するためのものである。現像器２８ａ〜２８ｄのそれぞれに対して、補給パイプ２０およびトナーカートリッジ２１が配設されている。   A rotary developing device 28 is disposed on the downstream side of the laser scanning unit 26. The developing device 28 includes developing devices 28 a, 28 b, 28 c, and 28 d that are supported by the rotary support 29. The developing units 28a, 28b, 28c, and 28d are for applying magenta, cyan, yellow, and black toners to the photosensitive drum 22, respectively. A replenishment pipe 20 and a toner cartridge 21 are disposed for each of the developing devices 28a to 28d.

現像装置２８の下流側には、転写ベルト３４が配置されている。無端状の転写ベルト３４は従動ローラ３６，３８，４０および駆動ローラ４１によって回転可能に支持されている。転写ベルト３４、従動ローラ３６，３８，４０および駆動ローラ４１はベルト搬送装置を構成しており、後述するように駆動ローラ４１は蛇行補正ローラでもある。さらに、転写ベルト３４の下流側には、感光体ドラム２２に残ったトナーを除去するための摺擦部材３０およびクリーニング部材３２が配置されている。   A transfer belt 34 is disposed on the downstream side of the developing device 28. The endless transfer belt 34 is rotatably supported by driven rollers 36, 38, 40 and a driving roller 41. The transfer belt 34, the driven rollers 36, 38, and 40 and the driving roller 41 constitute a belt conveying device, and the driving roller 41 is also a meandering correction roller as described later. Further, a rubbing member 30 and a cleaning member 32 for removing toner remaining on the photosensitive drum 22 are disposed on the downstream side of the transfer belt 34.

該静電潜像はまずマゼンタの現像器２８ａが感光体ドラム２４と対向するように配備され、現像されマゼンタトナー像として顕像化される。顕像化された感光体ドラム２４上のマゼンタトナー像は転写ベルト３４上に転写される。転写ベルト３４上に１ページ分のマゼンタ画像を転写すると回転支持体２９が回転し、以上の工程をシアン、イエロー、ブラック各色について逐次行い、転写ベルト３４上に複数色のトナー像を形成する。   The electrostatic latent image is first arranged so that the magenta developing device 28a faces the photosensitive drum 24, and is developed to be visualized as a magenta toner image. The visualized magenta toner image on the photosensitive drum 24 is transferred onto the transfer belt 34. When a magenta image for one page is transferred onto the transfer belt 34, the rotary support 29 rotates, and the above process is sequentially performed for each color of cyan, yellow, and black to form a toner image of a plurality of colors on the transfer belt 34.

一方、ピックアップローラ４４はブラックトナー像と同期して転写紙カセット４２から被記録材としての転写紙Ｐを給紙する。転写紙Ｐには転写ベルト３４上に重畳形成された、マゼンタ、シアン、イエロー、ブラックの合成カラートナー像が転写され、定着装置４６に搬入される。合成カラートナー画像を転写された転写材Ｐは、定着装置４６で定着され、カラー印刷物として機外に排出されて排紙トレイ５０上に積載される。   On the other hand, the pickup roller 44 feeds transfer paper P as a recording material from the transfer paper cassette 42 in synchronization with the black toner image. A composite color toner image of magenta, cyan, yellow, and black superimposed on the transfer belt 34 is transferred to the transfer paper P and is carried into the fixing device 46. The transfer material P onto which the composite color toner image has been transferred is fixed by the fixing device 46, discharged as a color print out of the apparatus, and stacked on the discharge tray 50.

次に、ベルト搬送装置の駆動ローラ４１の蛇行補正機能について、図２および図３を参照して説明する。図２および図３はそれぞれ、駆動ローラ４１の概略断面構成図である。   Next, the meandering correction function of the driving roller 41 of the belt conveying device will be described with reference to FIGS. 2 and 3 are schematic sectional views of the drive roller 41, respectively.

蛇行補正ローラでもある駆動ローラ４１は、軸部１０と、軸部１０の外周に軸部１０に対して回転不能かつローラ軸方向に移動不能に固着された弾性体部１２とを有している。軸部１０は横断面が円形の棒状のもので、ステンレスなどの剛体からなる。弾性体部１２は横断面がドーナツ形の長尺状のもので、ウレタンなどからなる。さらに、弾性体部１２の外周表面に金属膜を形成して、耐摩耗性を向上させてもよい。   The drive roller 41 that is also a meandering correction roller has a shaft portion 10 and an elastic body portion 12 that is fixed to the outer periphery of the shaft portion 10 so as not to rotate with respect to the shaft portion 10 and to be immovable in the roller axial direction. . The shaft portion 10 is a rod having a circular cross section, and is made of a rigid body such as stainless steel. The elastic body portion 12 is a long donut having a transverse cross section, and is made of urethane or the like. Furthermore, a metal film may be formed on the outer peripheral surface of the elastic body portion 12 to improve wear resistance.

軸部１０の両端部にはそれぞれ、押し広げ部材１４，１６が軸部１０に対して回転不能かつローラ軸方向に移動可能に支持されている。押し広げ部材１４，１６は、駆動ローラ４１の外側に向かって径が大きくなるテーパ面を有した円錐台形状の部材であり、中央部に軸部１０が挿通する貫通穴１７が形成されている。弾性体部１２の両端部にはそれぞれ凹部１２ａ，１２ｂが形成されており、この凹部１２ａ，１２ｂに押し広げ部材１４，１６の一部が収容されている。   The spreading members 14 and 16 are supported at both ends of the shaft portion 10 so as not to rotate with respect to the shaft portion 10 and to be movable in the roller axial direction. The spreading members 14 and 16 are frustoconical members having a tapered surface whose diameter increases toward the outside of the drive roller 41, and a through hole 17 through which the shaft portion 10 is inserted is formed at the center. . Concave portions 12 a and 12 b are formed at both ends of the elastic body portion 12, respectively, and parts of the spreading members 14 and 16 are accommodated in the concave portions 12 a and 12 b.

軸部１０は、支持部材９０ａ，９０ｂに対して回転可能かつローラ軸方向に移動不能に支持部材９０ａ，９０ｂに支持されている。軸部１０の一端には図示しないモータが連結しており、このモータによって駆動ローラ４１を回転駆動することにより、転写ベルト３４が循環搬送される。また、支持部材９０ａ，９０ｂと押し広げ部材１４，１６との間には、両者を繋ぐコイルばね１８が配設されている（ただし、支持部材９０ｂと押し広げ部材１６との間のコイルばねは図示せず）。   The shaft portion 10 is supported by the support members 90a and 90b so as to be rotatable with respect to the support members 90a and 90b and not movable in the roller axial direction. A motor (not shown) is connected to one end of the shaft portion 10, and the driving roller 41 is rotationally driven by this motor, whereby the transfer belt 34 is circulated and conveyed. A coil spring 18 is disposed between the support members 90a and 90b and the spread members 14 and 16 (however, the coil spring between the support member 90b and the spread member 16 is Not shown).

押し広げ部材１４，１６の外側端面には、楕円型カム８０，８２が接している。楕円型カム８０，８２はカム駆動モータ７６，７８によって回転駆動される。楕円型カム８０，８２が回転駆動すると、コイルばね１８のばね力に抗して押し広げ部材１４，１６がローラ軸方向の内側に移動する。   Elliptical cams 80 and 82 are in contact with the outer end surfaces of the spreading members 14 and 16. The elliptical cams 80 and 82 are rotationally driven by cam drive motors 76 and 78. When the elliptical cams 80 and 82 are rotationally driven, the spreading members 14 and 16 move inward in the roller axial direction against the spring force of the coil spring 18.

転写ベルト３４の両側部の上方の位置には、転写ベルト３４の蛇行を検知するセンサ７２，７４が設けられている。センサ７２は転写ベルト３４の左側部が所定の位置から左にずれるとＯＮ状態となり、センサ７４は転写ベルト３４の右側部が所定の位置から右にずれるとＯＮ状態となって、それぞれ出力信号を制御装置７０に送信する。   Sensors 72 and 74 that detect meandering of the transfer belt 34 are provided at positions above both sides of the transfer belt 34. The sensor 72 is turned on when the left side of the transfer belt 34 is shifted from the predetermined position to the left, and the sensor 74 is turned on when the right side of the transfer belt 34 is shifted from the predetermined position to the right. It transmits to the control apparatus 70.

次に、以上の構成からなる駆動ローラ（蛇行補正ローラ）４１の作用効果を説明する。
例えば、図２に示すように、転写ベルト３４が矢印Ａ方向（左方向）にずれると、センサ７２がそのずれを検出してＯＮ状態になる。センサ７２の出力信号が制御装置７０に送信されると、制御装置７０によってカム駆動モータ７６を駆動させて、楕円型カム８０を矢印Ｂ方向（反時計周り方向）に回転させる。これにより，押し広げ部材１４が楕円型カム８０によってコイルばね１８のばね力に抗して、ローラ軸方向の内側に移動させられる。 Next, the effect of the drive roller (meandering correction roller) 41 having the above configuration will be described.
For example, as shown in FIG. 2, when the transfer belt 34 is displaced in the arrow A direction (left direction), the sensor 72 detects the displacement and is turned on. When the output signal of the sensor 72 is transmitted to the control device 70, the control device 70 drives the cam drive motor 76 to rotate the elliptical cam 80 in the arrow B direction (counterclockwise direction). Thus, the spreading member 14 is moved inward in the roller axial direction by the elliptical cam 80 against the spring force of the coil spring 18.

図３に示すように、押し広げ部材１４が弾性体部１２の左端部に押し込まれることにより、弾性体部１２の左端部の径が外側に向かって大きくなるように変形する。すなわち、駆動ローラ４１の左端部には、端部に向かって径が大きくなるテーパ面が形成され、このテーパ面に転写ベルト３４の左側部が乗り上げる形となる。これにより、転写ベルト３４の左側部には、矢印ｆ方向（ローラ軸方向の内側方向）の反発力が作用して転写ベルト３４のずれが停止する。この後、反発力が転写ベルト３４を矢印Ｃ方向押し戻し、元の位置に戻すように作用する。   As shown in FIG. 3, when the spreading member 14 is pushed into the left end portion of the elastic body portion 12, the diameter of the left end portion of the elastic body portion 12 is deformed so as to increase toward the outside. That is, the left end portion of the drive roller 41 is formed with a tapered surface having a diameter that increases toward the end portion, and the left side portion of the transfer belt 34 rides on the tapered surface. As a result, a repulsive force in the direction of arrow f (inner direction in the roller axis direction) acts on the left side of the transfer belt 34, and the shift of the transfer belt 34 stops. Thereafter, the repulsive force acts to push the transfer belt 34 back in the direction of arrow C and return it to the original position.

転写ベルト３４が元の位置に戻ると、センサ７２はＯＦＦ状態になる。センサ７２の出力信号が制御装置７０に送信されると、制御装置７０によってカム駆動モータ７６を駆動させて、楕円型カム８０を時計周り方向に回転させて、元の状態にする。これにより，押し広げ部材１４がコイルばね１８のばね力により、ローラ軸方向の外側に移動させられ、元の位置に戻る。これにより、押し広げ部材１４が弾性体部１２の左端部から引き戻され、弾性体部１２の左端部が元のフラットな形状になって、転写ベルト３４の蛇行が収束する。   When the transfer belt 34 returns to the original position, the sensor 72 is turned off. When the output signal of the sensor 72 is transmitted to the control device 70, the cam drive motor 76 is driven by the control device 70, and the elliptical cam 80 is rotated clockwise to return to the original state. As a result, the spreading member 14 is moved outward in the roller axial direction by the spring force of the coil spring 18 and returns to its original position. As a result, the spreading member 14 is pulled back from the left end portion of the elastic body portion 12, the left end portion of the elastic body portion 12 becomes the original flat shape, and the meandering of the transfer belt 34 converges.

このとき、転写ベルト３４の蛇行量が大きくなるにつれて、押し広げ部材１４の弾性体部１２への押し込み量を増やすことにより、テーパ面の傾斜角度を大きくすることができ、より強い力で蛇行を規制することができ、蛇行の収束も速くできる。また、押し広げ部材１４，１６の構成が簡素であるため、ベルト搬送装置の製造コストを安価にできる。   At this time, as the meandering amount of the transfer belt 34 increases, the inclination angle of the tapered surface can be increased by increasing the pushing amount of the spreading member 14 into the elastic body portion 12, and the meandering can be performed with a stronger force. It can be controlled and the convergence of meandering can be done quickly. Moreover, since the structure of the spreading members 14 and 16 is simple, the manufacturing cost of the belt conveying device can be reduced.

以上のように、本発明によれば、押し広げ部材１４，１６をローラ軸方向に駆動させて弾性体部１２の端部に押し込むことにより、弾性体部１２が押し広げられ、駆動ローラ４１の端部には端部に向かって径が大きくなるテーパ面が形成される。そして、このテーパ面によって蛇行が規制され、転写ベルト３４の走行を安定にすることができる。   As described above, according to the present invention, the elastic member 12 is pushed and spread by driving the spreading members 14 and 16 in the axial direction of the roller and pushing the members into the end of the elastic member 12. A tapered surface whose diameter increases toward the end is formed at the end. Further, meandering is regulated by the tapered surface, and the running of the transfer belt 34 can be stabilized.

また、駆動ローラ４１が他のローラ３６，３８，４０と平行に配置されていなくても、蛇行を補正できる。さらに、蛇行が発生していない通常の状態では、駆動ローラ４１の端部はフラットなので、転写ベルト３４の側部に余分な負荷がかかることがないため、転写ベルト３４の長寿命化が可能となる。こうして得られた画像形成装置６８は、転写ベルト３４の蛇行を防止できるため、蛇行による無端ベルトのたるみやしわが抑えられ、画像むらなどを低減することができる。   Further, the meandering can be corrected even if the driving roller 41 is not arranged in parallel with the other rollers 36, 38, 40. Further, in a normal state where no meandering occurs, the end portion of the drive roller 41 is flat, so that no extra load is applied to the side portion of the transfer belt 34, so that the life of the transfer belt 34 can be extended. Become. Since the image forming apparatus 68 thus obtained can prevent the transfer belt 34 from meandering, sagging and wrinkles of the endless belt due to meandering can be suppressed, and image unevenness can be reduced.

なお、本発明は前記実施の形態に限定されるものではなく、その要旨の範囲内で種々に変形される。   In addition, this invention is not limited to the said embodiment, A various deformation | transformation is carried out within the range of the summary.

本発明に係る画像形成装置を示す概略構成図である。1 is a schematic configuration diagram illustrating an image forming apparatus according to the present invention. 蛇行補正ローラの概略断面構成図である。It is a schematic cross-sectional block diagram of a meandering correction roller. 図２に続く蛇行補正ローラの作用効果を説明するための概略断面構成図である。FIG. 3 is a schematic cross-sectional configuration diagram for explaining the function and effect of the meandering correction roller following FIG. 2.

符号の説明Explanation of symbols

１０ 軸部
１２ 弾性体部
１４，１６ 押し広げ部材
３４ 転写ベルト
３６，３８，４０ 従動ローラ
４１ 駆動ローラ（蛇行補正ローラ）
６８ 画像形成装置
７０ 制御装置
７２，７４ センサ
７６，７８ カム駆動モータ
８０，８２ 楕円型カム DESCRIPTION OF SYMBOLS 10 Shaft part 12 Elastic body part 14, 16 Spreading member 34 Transfer belt 36, 38, 40 Drive roller 41 Drive roller (meandering correction roller)
68 Image forming device 70 Control device 72, 74 Sensor 76, 78 Cam drive motor 80, 82 Elliptical cam

Claims (3)

軸部と前記軸部の外周に設けられた弾性体部とを有する蛇行補正ローラと、
前記蛇行補正ローラと共に所定の位置に配置された複数のローラと、
前記蛇行補正ローラおよび前記複数のローラに掛け回され、循環搬送される無端ベルトと、
前記無端ベルトの蛇行を検知する検知手段と、
前記蛇行補正ローラの両端にそれぞれ設けられ、前記弾性体部の端部に押し込まれることにより、前記弾性体部の端部の径を外側に向かって大きくする押し広げ部材と、
前記押し広げ部材をローラ軸方向に駆動する押し広げ部材駆動手段と、
前記検知手段からの検知結果に基づいて、前記押し広げ部材駆動手段を駆動制御する制御手段と、
を備えたことを特徴とする、ベルト搬送装置。 A meandering correction roller having a shaft portion and an elastic body portion provided on the outer periphery of the shaft portion;
A plurality of rollers arranged at predetermined positions together with the meandering correction roller;
An endless belt that is wound around the meandering correction roller and the plurality of rollers, and is circulated and conveyed;
Detecting means for detecting meandering of the endless belt;
A spreading member that is provided at each end of the meandering correction roller and is pushed into the end of the elastic body, thereby increasing the diameter of the end of the elastic body toward the outside;
A spreading member driving means for driving the spreading member in the roller axial direction;
Based on the detection result from the detection means, control means for driving and controlling the spreading member drive means,
A belt conveying device comprising: 前記押し広げ部材が、前記蛇行補正ローラの外側に向かって径が大きくなるテーパ面を有した円錐台形状の部材であることを特徴とする、請求項１に記載のベルト搬送装置。   The belt conveying device according to claim 1, wherein the spreading member is a frustoconical member having a tapered surface whose diameter increases toward the outside of the meandering correction roller. 請求項１または請求項２に記載のベルト搬送装置を備えたことを特徴とする、画像形成装置。   An image forming apparatus comprising the belt conveyance device according to claim 1.
JP2007140782A 2007-05-28 2007-05-28 Belt conveyance device and image forming device Pending JP2008290875A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010256798A (en) * 2009-04-28 2010-11-11 Brother Ind Ltd Belt device and image forming apparatus
JP4767366B2 (en) * 2009-10-30 2011-09-07 三木プーリ株式会社 Guide roller
JP2013535387A (en) * 2010-08-12 2013-09-12 セー．セー．エム． ベヘール ベスローテン フェンノートシャップ Belt conveyor with actuator for moving the belt laterally
JP2018025704A (en) * 2016-08-12 2018-02-15 富士ゼロックス株式会社 Belt conveyance device
JP2019007999A (en) * 2017-06-20 2019-01-17 コニカミノルタ株式会社 Belt conveying device and image forming apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010256798A (en) * 2009-04-28 2010-11-11 Brother Ind Ltd Belt device and image forming apparatus
JP4767366B2 (en) * 2009-10-30 2011-09-07 三木プーリ株式会社 Guide roller
JP2013535387A (en) * 2010-08-12 2013-09-12 セー．セー．エム． ベヘール ベスローテン フェンノートシャップ Belt conveyor with actuator for moving the belt laterally
JP2018025704A (en) * 2016-08-12 2018-02-15 富士ゼロックス株式会社 Belt conveyance device
JP2019007999A (en) * 2017-06-20 2019-01-17 コニカミノルタ株式会社 Belt conveying device and image forming apparatus

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