JP2013068815A - Bearing device and image forming apparatus - Google Patents

Bearing device and image forming apparatus Download PDF

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Publication number
JP2013068815A
JP2013068815A JP2011207610A JP2011207610A JP2013068815A JP 2013068815 A JP2013068815 A JP 2013068815A JP 2011207610 A JP2011207610 A JP 2011207610A JP 2011207610 A JP2011207610 A JP 2011207610A JP 2013068815 A JP2013068815 A JP 2013068815A
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bearing
shaft member
axial direction
endless belt
adjustment screw
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JP5831088B2 (en
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Kenji Suzuki
健司 鈴木
Yoshihiro Enomoto
嘉博 榎本
Katsuya Takenouchi
勝也 竹野内
Kiyotoshi Kanayama
清俊 金山
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Sliding-Contact Bearings (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device allowing a shaft member to easily adjust pressing force for pressing an endless belt.SOLUTION: The bearing device includes: a bearing member 104F for bearing a primary transfer roll 67 as the shaft member arranged to be directed in a direction orthogonal to a revolving direction of the endless belt inside the endless belt; an adjustment screw 108F which is arranged along a direction crossing an axial direction of the primary transfer roll 67 at an angle less than 90° and is rotated to displace in the direction crossing the axial direction of the primary transfer roll 67 at the angle less than 90°; and a moving member 108F which is connected to the bearing member 104F via a compression coil spring 114F, is brought into contact with the adjustment screw 108F and moves in a direction for deforming the compression coil spring 114F according to the displacement of the adjustment screw 108F so that the pressing force for pressing the endless belt by the primary transfer roll 67 is adjusted.

Description

本発明は、軸受装置および画像形成装置に関する。   The present invention relates to a bearing device and an image forming apparatus.

特許文献1には、軸受部材(R)と、押圧方向に沿って移動可能に構成した可動保持部(270M)と、可動保持部(270M)を相対移動可能に保持する固定保持部(270F)とを備え、可動保持部(270M)と固定保持部(270F)とは押圧方向と直交する対向面(270Mp0,270Fp0)にて互いに対向していると共に、一方の対向面(270Mp0)に調整螺子(SW)を挿通し、この調整螺子(SW)の先端を他方の対向面(270Fp0)に接触させる構成とし、この調整螺子(SW)を回転することで、軸部材(260)が無端状ベルト(25)を押圧する押圧力の調整を行えるようにした軸受装置が開示されている。 Patent Document 1 discloses a bearing member (R), a movable holding portion (270M) configured to be movable along a pressing direction, and a fixed holding portion (270F) that holds the movable holding portion (270M) in a relatively movable manner. The movable holding part (270M) and the fixed holding part (270F) are opposed to each other on an opposing surface (270Mp 0 , 270Fp 0 ) orthogonal to the pressing direction, and one opposing surface (270Mp 0 ) The adjustment screw (SW) is inserted into the shaft, the tip of the adjustment screw (SW) is brought into contact with the other facing surface (270Fp 0 ), and the shaft member (260) is rotated by rotating the adjustment screw (SW). Discloses a bearing device that can adjust the pressing force for pressing the endless belt (25).

特開2010−134325号公報JP 2010-134325 A

本発明は、従来技術に比べて、軸部材が無端状ベルトを押圧する押圧力の調整を容易に行えるようにした軸受装置を提供することを目的とする。または、軸部材の軸方向に直交する方向における軸部材の位置の調整を容易に行えるようにした軸受装置を提供することを目的とする。   An object of the present invention is to provide a bearing device that can easily adjust the pressing force with which a shaft member presses an endless belt, as compared with the prior art. Another object is to provide a bearing device that can easily adjust the position of the shaft member in a direction orthogonal to the axial direction of the shaft member.

本発明の請求項1の軸受装置は、無端状ベルトの内側において前記無端状ベルトの周回方向と直交する方向を向くように配置される軸部材を軸受する軸受部材と、前記軸部材の軸方向に対し90度未満の角度で交差する方向に沿って配置され、回転することで前記軸部材の軸方向に対し90度未満の角度で交差する方向に変位する調整ネジと、前記軸受部材に弾性部材を介して接続されると共に前記調整ネジに接触され、前記軸部材が前記無端状ベルトを押圧する押圧力の調整が行われるように、前記調整ネジの変位に応じて前記弾性部材を変形させる方向に移動する移動部材と、を有することを特徴とする。   According to a first aspect of the present invention, there is provided a bearing device for bearing a shaft member disposed so as to face a direction orthogonal to a circumferential direction of the endless belt inside the endless belt, and an axial direction of the shaft member An adjustment screw that is disposed along a direction intersecting at an angle of less than 90 degrees with respect to the shaft and that is displaced in a direction intersecting at an angle of less than 90 degrees with respect to the axial direction of the shaft member by rotating, and elastic to the bearing member The elastic member is deformed according to the displacement of the adjustment screw so that the adjustment of the pressing force with which the shaft member presses the endless belt is performed while being connected to the adjustment screw. And a moving member that moves in the direction.

本発明の請求項2の軸受装置は、無端状ベルトの内側において前記無端状ベルトの周回方向と直交する方向を向くように配置される軸部材を軸受する軸受部材と、前記軸部材の軸方向に対し90度未満の角度で交差する方向に沿って配置され、回転することで前記軸部材の軸方向に対し90度未満の角度で交差する方向に変位する調整ネジと、前記軸受部材に取り付けられると共に前記調整ネジに接触され、前記軸部材の軸方向に直交する方向における前記軸部材の位置の調整が行われるように、前記調整ネジの変位に応じて前記軸部材の軸方向に直交する方向に移動する移動部材と、を有することを特徴とする。   According to a second aspect of the present invention, there is provided a bearing device for bearing a shaft member disposed so as to face a direction orthogonal to a circumferential direction of the endless belt inside the endless belt, and an axial direction of the shaft member An adjustment screw that is disposed along a direction intersecting at an angle of less than 90 degrees with respect to the shaft and that is displaced in a direction intersecting at an angle of less than 90 degrees with respect to the axial direction of the shaft member by rotation, and attached to the bearing member And at the same time, the position of the shaft member in the direction perpendicular to the axial direction of the shaft member is adjusted so as to be perpendicular to the axial direction of the shaft member according to the displacement of the adjustment screw. And a moving member that moves in the direction.

本発明の請求項3の軸受装置は、請求項1または請求項2に記載の軸受装置において、前記軸受部材は、前記軸部材の両側の端部を受ける一対の部材から構成されており、前記調整ネジおよび前記移動部材はそれぞれ、前記一対の部材に対応して一対設けられており、前記一対の調整ネジは共に前記軸部材の軸方向における一端側から回転操作可能とされていることを特徴とする。   A bearing device according to a third aspect of the present invention is the bearing device according to the first or second aspect, wherein the bearing member includes a pair of members that receive end portions on both sides of the shaft member, Each of the adjustment screw and the moving member is provided corresponding to the pair of members, and both of the pair of adjustment screws are rotatable from one end side in the axial direction of the shaft member. And

本発明の請求項4の軸受装置は、請求項1〜3のいずれか1項に記載の軸受装置において、前記調整ネジは、前記軸部材の略軸方向に沿って配置され、回転することで前記軸部材の略軸方向に変位することを特徴とする。   A bearing device according to a fourth aspect of the present invention is the bearing device according to any one of the first to third aspects, wherein the adjusting screw is disposed along the substantially axial direction of the shaft member and rotates. The shaft member is displaced in a substantially axial direction.

本発明の請求項5の画像形成装置は、静電潜像が形成される像保持体と、前記像保持体に形成された静電潜像をトナーで現像する現像装置と、前記現像装置によって現像されたトナー像を無端状ベルトに転写する転写装置と、前記転写装置の無端状ベルトの内側において前記無端状ベルトの周回方向と直交する方向を向くように配置される軸部材を軸受する請求項1〜4のいずれか1項に記載の軸受装置と、を有することを特徴とする。   An image forming apparatus according to a fifth aspect of the present invention includes an image carrier on which an electrostatic latent image is formed, a developing device that develops the electrostatic latent image formed on the image carrier with toner, and the developing device. A transfer device that transfers a developed toner image to an endless belt, and a shaft member that is disposed inside the endless belt of the transfer device so as to face in a direction perpendicular to the circumferential direction of the endless belt. It has a bearing apparatus of any one of claim | item 1-4.

本発明の請求項1に記載の軸受装置によれば、軸部材の軸方向に対し90度未満の角度で交差する方向に沿って配置されない調整ネジ(軸部材の軸方向に対し90度で交差する方向に沿って配置される調整ネジ)によって軸部材が無端状ベルトを押圧する押圧力の調整を行う場合に比べて、軸部材が無端状ベルトを押圧する押圧力の調整を容易に行うことができる。   According to the bearing device of the first aspect of the present invention, the adjusting screw that is not arranged along the direction intersecting at an angle of less than 90 degrees with respect to the axial direction of the shaft member (intersects at 90 degrees with respect to the axial direction of the shaft member). Compared with the case where the pressing force by which the shaft member presses the endless belt is adjusted by an adjusting screw arranged along the direction in which the shaft member presses, the pressing force by which the shaft member presses the endless belt is easily adjusted. Can do.

本発明の請求項2に記載の軸受装置によれば、軸部材の軸方向に対し90度未満の角度で交差する方向に沿って配置されない調整ネジ(軸部材の軸方向に対し90度で交差する方向に沿って配置される調整ネジ)よって軸部材の軸方向に直交する方向における軸部材の位置の調整を行う場合に比べて、軸部材の軸方向に直交する方向の位置の調整を容易に行うことができる。   According to the bearing device of the second aspect of the present invention, the adjustment screw that is not arranged along the direction intersecting at an angle of less than 90 degrees with respect to the axial direction of the shaft member (intersects at 90 degrees with respect to the axial direction of the shaft member). Compared with the case of adjusting the position of the shaft member in the direction orthogonal to the axial direction of the shaft member by the adjustment screw arranged along the direction to be adjusted), the position of the shaft member in the direction orthogonal to the axial direction can be easily adjusted. Can be done.

本発明の請求項3に記載の軸受装置によれば、一対の調整ネジがそれぞれ軸部材の軸方向における両側から回転操作可能とされている場合に比べて、軸部材が無端状ベルトを押圧する押圧力の調整または軸部材の軸方向に直交する方向の位置の調整を容易に行うことができる。   According to the bearing device of the third aspect of the present invention, the shaft member presses the endless belt as compared with the case where the pair of adjusting screws can be rotated from both sides in the axial direction of the shaft member. It is possible to easily adjust the pressing force or the position in the direction orthogonal to the axial direction of the shaft member.

本発明の請求項4に記載の軸受装置によれば、軸部材の略軸方向に沿って配置されない調整ネジ(軸部材の軸方向に対し90度で交差する方向に沿って配置される調整ネジ)によって軸部材が無端状ベルトを押圧する押圧力の調整を行う場合に比べて、軸部材が無端状ベルトを押圧する押圧力の調整を容易に行うことができる。また、軸部材の略軸方向に沿って配置されない調整ネジ(軸部材の軸方向に対し90度で交差する方向に沿って配置される調整ネジ)よって軸部材の軸方向に直交する方向における軸部材の位置の調整を行う場合に比べて、軸部材の軸方向に直交する方向の位置の調整を容易に行うことができる。   According to the bearing device of the fourth aspect of the present invention, the adjustment screw that is not arranged along the substantially axial direction of the shaft member (the adjustment screw that is arranged along the direction intersecting at 90 degrees with respect to the axial direction of the shaft member) ), The pressing force with which the shaft member presses the endless belt can be adjusted more easily than when the pressing force with which the shaft member presses the endless belt is adjusted. Further, an axis in a direction orthogonal to the axial direction of the shaft member by an adjusting screw (adjustment screw disposed along a direction intersecting at 90 degrees with respect to the axial direction of the shaft member) that is not disposed along the substantially axial direction of the shaft member. Compared with the case of adjusting the position of the member, the position of the shaft member in the direction orthogonal to the axial direction can be easily adjusted.

本発明の請求項5に記載の画像形成装置によれば、請求項1〜4のいずれかに記載の軸受装置を有しない場合に比べて、形成される画像の画質を容易に調整することができる。   According to the image forming apparatus of the fifth aspect of the present invention, the image quality of the formed image can be easily adjusted as compared with the case where the bearing apparatus according to any one of the first to fourth aspects is not provided. it can.

本実施形態に係る軸受装置を含む画像形成装置の構成を示す図である。It is a figure which shows the structure of the image forming apparatus containing the bearing apparatus which concerns on this embodiment. 図1の感光体の周辺の構成を示す図である。FIG. 2 is a diagram illustrating a configuration around a photoconductor of FIG. 1. 図2の軸受装置の構成を示す斜視図である。It is a perspective view which shows the structure of the bearing apparatus of FIG. 図3の正面側の軸受部を拡大して示す斜視図である。It is a perspective view which expands and shows the bearing part of the front side of FIG. 図3の正面側の軸受部を拡大して示す上面図である。It is a top view which expands and shows the bearing part of the front side of FIG. 図3の背面側の軸受部を拡大して示す斜視図である。It is a perspective view which expands and shows the bearing part of the back side of FIG. 図3の背面側の軸受部を拡大して示す上面図である。FIG. 4 is an enlarged top view showing a bearing portion on the back side in FIG. 3.

以下、本発明に係る軸受装置および画像形成装置の実施形態について、添付の図面を用いて説明する。   Embodiments of a bearing device and an image forming apparatus according to the present invention will be described below with reference to the accompanying drawings.

(画像形成装置)
図1は、本発明に係る軸受装置を含む画像形成装置の一例としての画像形成装置10を示している。この画像形成装置10は、上下方向(矢印Vで示す方向)の下側から上側へ向けて、記録用紙Pが収容される用紙収容部12と、用紙収容部12の上に設けられ用紙収容部12から供給される記録媒体の一例としての記録用紙Pに画像形成を行う画像形成部14と、画像形成部14の上に設けられ読取原稿Gを読み取る原稿読取部16と、画像形成部14内に設けられ画像形成装置10の各部の動作を制御する制御部20と、を含んで構成されている。
(Image forming device)
FIG. 1 shows an image forming apparatus 10 as an example of an image forming apparatus including a bearing device according to the present invention. The image forming apparatus 10 includes a sheet storage unit 12 that stores recording paper P from the lower side to the upper side in the vertical direction (the direction indicated by the arrow V), and a sheet storage unit that is provided on the sheet storage unit 12. 12, an image forming unit 14 that forms an image on a recording sheet P as an example of a recording medium supplied from 12, a document reading unit 16 that is provided on the image forming unit 14 and that reads a read document G, and the inside of the image forming unit 14 And a control unit 20 that controls the operation of each unit of the image forming apparatus 10.

用紙収容部12は、サイズの異なる記録用紙Pが収容される第1収容部22、第2収容部24、及び第3収容部26が設けられている。第1収容部22、第2収容部24、及び第3収容部26には、収容された記録用紙Pを画像形成装置10内に設けられた搬送路28に送り出す送り出しロール32が設けられており、搬送路28における送り出しロール32よりも下流側には、記録用紙Pを一枚ずつ搬送するそれぞれ一対の搬送ロール34及び搬送ロール36が設けられている。また、搬送路28における記録用紙Pの搬送方向で搬送ロール36よりも下流側には、記録用紙Pを一旦停止させるとともに、決められたタイミングで後述する二次転写位置QB(図2参照)へ送り出す位置合せロール38が設けられている。   The sheet storage unit 12 is provided with a first storage unit 22, a second storage unit 24, and a third storage unit 26 that store recording sheets P of different sizes. The first storage unit 22, the second storage unit 24, and the third storage unit 26 are provided with a delivery roll 32 that sends the stored recording paper P to a conveyance path 28 provided in the image forming apparatus 10. A pair of transport rolls 34 and transport rolls 36 that transport the recording paper P one by one are provided on the transport path 28 downstream of the feed roll 32. Further, the recording paper P is temporarily stopped on the downstream side of the transport roll 36 in the transport direction of the recording paper P in the transport path 28 and to a secondary transfer position QB (see FIG. 2) described later at a predetermined timing. An alignment roll 38 is provided.

搬送路28の上流側部分(搬送ロール36が設けられている部位)は、画像形成装置10の正面視において、矢印Vで示す方向に向けて用紙収容部12の左側から画像形成部14の左側下部まで直線状に設けられている。また、搬送路28の下流側部分は、画像形成部14の左側下部から画像形成部14の右側面に設けられた排紙部15まで設けられている。さらに、搬送路28には、記録用紙Pの両面に画像形成を行うために記録用紙Pが搬送及び反転される両面搬送路29が接続されている。   The upstream portion of the conveyance path 28 (the portion where the conveyance roll 36 is provided) is located on the left side of the image forming unit 14 from the left side of the sheet storage unit 12 toward the direction indicated by the arrow V in the front view of the image forming apparatus 10. It is provided in a straight line to the bottom. The downstream portion of the conveyance path 28 is provided from the lower left portion of the image forming portion 14 to the paper discharge portion 15 provided on the right side surface of the image forming portion 14. Further, a double-sided conveyance path 29 through which the recording paper P is conveyed and reversed in order to form an image on both sides of the recording paper P is connected to the conveyance path 28.

両面搬送路29は、画像形成装置10の正面視において、搬送路28と両面搬送路29との切り替えを行う第1切替部材31と、画像形成部14の右側下部から用紙収容部12の右側まで矢印Vで示す方向(図示の下向きが−V、上向きが+V)に直線状に設けられた反転部33と、反転部33に搬送された記録用紙Pの後端が進入するとともに矢印Hで示す方向とは逆向きに搬送される搬送部37と、反転部33と搬送部37との切り替えを行う第2切替部材35と、を有している。そして、反転部33には、一対の搬送ロール42が間隔をあけて複数箇所に設けられており、搬送部37には、一対の搬送ロール44が間隔をあけて複数箇所に設けられている。   The duplex conveyance path 29 includes a first switching member 31 that switches between the conveyance path 28 and the duplex conveyance path 29 from the lower right side of the image forming unit 14 to the right side of the sheet storage unit 12 in a front view of the image forming apparatus 10. A reversing unit 33 linearly provided in a direction indicated by an arrow V (downward in the figure is −V, upward is + V), and a rear end of the recording paper P conveyed to the reversing unit 33 enters and is indicated by an arrow H. It has the conveyance part 37 conveyed in the direction opposite to a direction, and the 2nd switching member 35 which switches the inversion part 33 and the conveyance part 37. FIG. The reversing unit 33 is provided with a pair of conveyance rolls 42 at intervals, and the conveyance unit 37 is provided with a pair of conveyance rolls 44 at intervals.

第1切替部材31は、三角柱状の部材であり、駆動手段(図示省略)によって先端部が搬送路28又は両面搬送路29のいずれか一方に移動されることで、記録用紙Pの搬送方向を切り替えるようになっている。同様に、第2切替部材35は、正面視で三角柱状の部材であり、図示しない駆動手段によって先端部が反転部33又は搬送部37のいずれか一方に移動されることで、記録用紙Pの搬送方向を切り替えるようになっている。なお、搬送部37の下流側端部は、搬送路28の上流側部分にある搬送ロール36の手前側に案内部材(図示省略)により接続されている。また、画像形成部14の左側面には折り畳み式の手差給紙部46が設けられており、手差給紙部46から送り込まれる記録用紙Pの搬送経路が、搬送路28における位置合せロール38よりも手前側(上流側)に接続されている。   The first switching member 31 is a triangular prism-shaped member, and the conveyance direction of the recording paper P is changed by moving the leading end to either the conveyance path 28 or the double-sided conveyance path 29 by a driving unit (not shown). It is supposed to switch. Similarly, the second switching member 35 is a triangular prism-shaped member when viewed from the front, and the leading end is moved to either the reversing unit 33 or the transport unit 37 by a driving unit (not shown), so that the recording paper P The conveyance direction is switched. The downstream end of the transport unit 37 is connected to the front side of the transport roll 36 in the upstream portion of the transport path 28 by a guide member (not shown). Further, a foldable manual sheet feeding unit 46 is provided on the left side surface of the image forming unit 14, and the conveyance path of the recording paper P fed from the manual sheet feeding unit 46 is an alignment roll in the conveyance path 28. It is connected to the front side (upstream side) of 38.

原稿読取部16は、読取原稿Gを1枚ずつ自動で搬送する原稿搬送装置52と、原稿搬送装置52の下側に配置され1枚の読取原稿Gが載せられるプラテンガラス54と、原稿搬送装置52によって搬送された読取原稿G又はプラテンガラス54に載せられた読取原稿Gを読み取る原稿読取装置56とが設けられている。   The document reading unit 16 includes a document transport device 52 that automatically transports the read document G one by one, a platen glass 54 that is disposed below the document transport device 52 and on which one read document G is placed, and a document transport device. An original reading device 56 that reads the read original G conveyed by 52 or the read original G placed on the platen glass 54 is provided.

原稿搬送装置52は、一対の搬送ロール53が複数配置された自動搬送路55を有しており、自動搬送路55の一部は記録用紙Pがプラテンガラス54上を通るように配置されている。また、原稿読取装置56は、プラテンガラス54の左端部に静止した状態で原稿搬送装置52によって搬送された読取原稿Gを読み取るようになっている。   The document conveyance device 52 has an automatic conveyance path 55 in which a plurality of pairs of conveyance rolls 53 are arranged, and a part of the automatic conveyance path 55 is arranged so that the recording paper P passes over the platen glass 54. . The document reading device 56 is configured to read the read document G conveyed by the document conveying device 52 while being stationary at the left end portion of the platen glass 54.

一方、画像形成部14は、トナー画像(現像剤像)を形成する画像形成ユニット50を有している。画像形成ユニット50は、感光体62、帯電部材64、露光装置66、現像装置70、及びクリーニング装置73を含んで構成されている。   On the other hand, the image forming unit 14 includes an image forming unit 50 that forms a toner image (developer image). The image forming unit 50 includes a photoreceptor 62, a charging member 64, an exposure device 66, a developing device 70, and a cleaning device 73.

画像形成部14における装置本体10Aの中央には、像保持体の一例としての円筒状の感光体62が設けられている。感光体62は、駆動手段(図示省略)によって矢印+Rで示す方向(時計回り方向)に回転すると共に光照射によって形成される静電潜像を保持するようになっている。また、感光体62の上側で且つ感光体62の外周面と対向する位置には、感光体62の表面を帯電するコロトロン方式の帯電部材64が設けられている。   In the center of the apparatus main body 10A in the image forming unit 14, a cylindrical photosensitive member 62 as an example of an image holding member is provided. The photosensitive member 62 is rotated in a direction (clockwise direction) indicated by an arrow + R by a driving unit (not shown) and holds an electrostatic latent image formed by light irradiation. A corotron charging member 64 that charges the surface of the photoconductor 62 is provided above the photoconductor 62 and at a position facing the outer peripheral surface of the photoconductor 62.

感光体62の回転方向における帯電部材64よりも下流側で且つ感光体62の外周面と対向する位置には、露光装置66が設けられている。露光装置66は、図示しない半導体レーザ、f−θレンズ、ポリゴンミラー、結像レンズ、及び複数のミラーを有しており、画像信号に基づき半導体レーザから出射されたレーザ光をポリゴンミラーで偏向走査し、帯電部材64により帯電された感光体62の外周面に照射(露光)して、静電潜像を形成するようになっている。なお、露光装置66は、レーザ光をポリゴンミラーで偏向走査する方式に限らず、LED(Light Emitting Diode)方式であってもよい。   An exposure device 66 is provided at a position downstream of the charging member 64 in the rotation direction of the photoconductor 62 and facing the outer peripheral surface of the photoconductor 62. The exposure device 66 has a semiconductor laser (not shown), an f-θ lens, a polygon mirror, an imaging lens, and a plurality of mirrors, and deflects and scans the laser beam emitted from the semiconductor laser based on the image signal by the polygon mirror. Then, the outer peripheral surface of the photosensitive member 62 charged by the charging member 64 is irradiated (exposed) to form an electrostatic latent image. The exposure device 66 is not limited to a method of deflecting and scanning laser light with a polygon mirror, but may be an LED (Light Emitting Diode) method.

感光体62の回転方向で露光装置66の露光光が照射される部位よりも下流側には、感光体62の外周面に形成された静電潜像を決められた色のトナーで現像して可視化させる回転切り替え式の現像装置70が設けられている。   The electrostatic latent image formed on the outer peripheral surface of the photoconductor 62 is developed with toner of a predetermined color on the downstream side of the portion irradiated with the exposure light of the exposure device 66 in the rotation direction of the photoconductor 62. A rotation switching type developing device 70 is provided for visualization.

図2に示すように、現像装置70は、イエロー(Y)、マゼンタ(M)、シアン(C)、黒(K)、第1特別色(E)、第2特別色(F)の各トナー色にそれぞれ対応する現像器72Y、72M、72C、72K、72E、72Fが、周方向に(図示の反時計回り方向にこの順番で)並んで配置されており、モータ(図示省略)によって中心角で60°ずつ回転することで、現像処理を行う現像器72Y、72M、72C、72K、72E、72Fが切り替えられ、感光体62の外周面と対向するようになっている。なお、第1特別色E及び第2特別色Fは、イエロー、マゼンタ、シアン、ブラック以外の特別色(透明を含む)から選択される。これら現像器72Y、72M、72C、72K、72E、72Fにはそれぞれ、各トナー色のトナーが、交換可能なトナーカートリッジ78Y、78M、78C、78K、78E、78F(図1参照)から供給される。   As shown in FIG. 2, the developing device 70 includes yellow (Y), magenta (M), cyan (C), black (K), first special color (E), and second special color (F) toners. Developing units 72Y, 72M, 72C, 72K, 72E, and 72F corresponding to the colors are arranged side by side in the circumferential direction (in this order in the counterclockwise direction shown in the figure), and the central angle is set by a motor (not shown). , The developing devices 72Y, 72M, 72C, 72K, 72E, and 72F that perform the development processing are switched to face the outer peripheral surface of the photosensitive member 62. The first special color E and the second special color F are selected from special colors (including transparent) other than yellow, magenta, cyan, and black. Each of the developing devices 72Y, 72M, 72C, 72K, 72E, and 72F is supplied with toner of each toner color from replaceable toner cartridges 78Y, 78M, 78C, 78K, 78E, and 78F (see FIG. 1). .

図2において、現像器72Y、72M、72C、72K、72E、72Fは同一構成であるため、ここでは代表として現像器72Yについて説明する。   In FIG. 2, since the developing devices 72Y, 72M, 72C, 72K, 72E, and 72F have the same configuration, the developing device 72Y will be described here as a representative.

現像器72Yは、本体となるケース部材76を有しており、ケース部材76内には、トナーカートリッジ78Y(図1参照)からトナー供給路(図示省略)を経由して供給されるトナー及びキャリアから成る現像剤(図示省略)が充填されている。また、ケース部材76には、感光体62の外周面と対向して矩形状の開口部76Aが形成されており、開口部76Aには、外周面が感光体62の外周面と対向する現像ロール74が設けられている。さらに、ケース部材76内で開口部76Aに近い部位には、現像剤の層厚を規制するための板状の規制部材79が、開口部76Aの長手方向に沿って設けられている。   The developing device 72Y includes a case member 76 serving as a main body. In the case member 76, toner and carrier supplied from a toner cartridge 78Y (see FIG. 1) via a toner supply path (not shown). A developer (not shown) is filled. The case member 76 is formed with a rectangular opening 76 </ b> A facing the outer peripheral surface of the photoconductor 62, and the developing roll whose outer peripheral surface faces the outer peripheral surface of the photoconductor 62 is formed in the opening 76 </ b> A. 74 is provided. Further, a plate-like regulating member 79 for regulating the layer thickness of the developer is provided along the longitudinal direction of the opening 76A at a portion near the opening 76A in the case member 76.

現像ロール74は、回転可能に設けられた円筒状の現像スリーブ74Aと、現像スリーブ74Aの内側に固定された複数の磁極から成る磁性部材74Bとで構成されており、現像スリーブ74Aが回転することで現像剤(キャリア)の磁気ブラシが形成されると共に、規制部材79で層厚が規制されることで、現像スリーブ74Aの外周面に現像剤層を形成するようになっている。そして、現像スリーブ74Aの外周面の現像剤層は、現像スリーブ74Aの回転により感光体62に対向する位置に搬送され、感光体62の外周面に形成された潜像(静電潜像)に応じたトナーを付着させて現像を行う。   The developing roller 74 includes a cylindrical developing sleeve 74A that is rotatably provided, and a magnetic member 74B that includes a plurality of magnetic poles fixed inside the developing sleeve 74A. The developing sleeve 74A rotates. Thus, the developer (carrier) magnetic brush is formed, and the layer thickness is regulated by the regulating member 79, whereby the developer layer is formed on the outer peripheral surface of the developing sleeve 74A. The developer layer on the outer peripheral surface of the developing sleeve 74A is conveyed to a position facing the photoconductor 62 by the rotation of the developing sleeve 74A, and becomes a latent image (electrostatic latent image) formed on the outer peripheral surface of the photoconductor 62. Development is performed by attaching a suitable toner.

また、ケース部材76内には、螺旋状に形成された搬送ロール77が2本回転可能に並列配置されており、この2本の搬送ロール77が回転することで、ケース部材76内に充填された現像剤が、現像ロール74の軸方向(現像器72Yの長手方向)に循環搬送されるようになっている。なお、各現像器72Y、72M、72C、72K、72E、72Fに設けられた6本の現像ロール74は、隣の現像ロール74との間隔が中心角60°となるように周方向に配置されており、現像器72の切り替えにより、次の現像ロール74が感光体62の外周面と対向するようになっている。   Further, in the case member 76, two spirally formed transport rolls 77 are arranged in parallel so as to be rotatable, and the two transport rolls 77 are rotated so that the case member 76 is filled. The developer is circulated and conveyed in the axial direction of the developing roll 74 (longitudinal direction of the developing device 72Y). The six developing rolls 74 provided in each of the developing units 72Y, 72M, 72C, 72K, 72E, and 72F are arranged in the circumferential direction so that the distance from the adjacent developing roll 74 is a central angle of 60 °. Then, by switching the developing device 72, the next developing roll 74 is opposed to the outer peripheral surface of the photosensitive member 62.

図2に示すように、感光体62の回転方向で現像装置70よりも下流側であり且つ感光体62の下側には、感光体62の外周面に形成されたトナー画像を記録用紙Pに転写する転写装置58が設けられている。転写装置58は、中間転写ベルト68を有している。中間転写ベルト68は、無端状であり、制御部20により回転駆動される駆動ロール61、中間転写ベルト68に張力を付与するための張力付与ロール65、中間転写ベルト68の裏面に接触して従動回転する複数の搬送ロール63、及び後述する二次転写位置QBにおいて中間転写ベルト68の裏面に接触して従動回転する補助ロール69に巻き掛けられている。そして、中間転写ベルト68は、駆動ロール61が回転することにより、矢印−Rで示す方向(反時計回り方向)に周回移動するようになっている。   As shown in FIG. 2, a toner image formed on the outer peripheral surface of the photoconductor 62 is formed on the recording paper P on the downstream side of the developing device 70 in the rotation direction of the photoconductor 62 and below the photoconductor 62. A transfer device 58 for transferring is provided. The transfer device 58 has an intermediate transfer belt 68. The intermediate transfer belt 68 is endless, and is driven by being in contact with the drive roll 61 that is rotationally driven by the control unit 20, the tension applying roll 65 for applying tension to the intermediate transfer belt 68, and the back surface of the intermediate transfer belt 68. It is wound around a plurality of rotating transport rollers 63 and an auxiliary roller 69 that rotates in contact with the back surface of the intermediate transfer belt 68 at a secondary transfer position QB described later. The intermediate transfer belt 68 rotates in the direction indicated by the arrow -R (counterclockwise direction) as the driving roll 61 rotates.

また、中間転写ベルト68を挟んで感光体62の反対側には、感光体62の外周面に形成されたトナー画像を中間転写ベルト68に一次転写させる軸部材の一例としての一次転写ロール67が設けられている。一次転写ロール67は、感光体62と中間転写ベルト68とが接触する位置(これを一次転写位置QAとする)から中間転写ベルト68の移動方向下流側に離れた位置で、中間転写ベルト68の裏面に接触するように軸受装置100によって軸受されている。   A primary transfer roll 67 as an example of a shaft member that primarily transfers the toner image formed on the outer peripheral surface of the photoconductor 62 to the intermediate transfer belt 68 on the opposite side of the photoconductor 62 with the intermediate transfer belt 68 interposed therebetween. Is provided. The primary transfer roll 67 is located at a position away from the position where the photoreceptor 62 and the intermediate transfer belt 68 are in contact (this is referred to as the primary transfer position QA) to the downstream side in the moving direction of the intermediate transfer belt 68. It is bearing by the bearing device 100 so as to contact the back surface.

軸受装置100は、一次転写ロール67が中間転写ベルト68を押圧する押圧力の調整が行われるように、また一次転写ロール67の軸方向(図中の矢印Yで示す方向)に直交する方向であって中間転写ベルト68の移動方向に沿う方向(図中の矢印Xで示す方向)において一次転写ロール67の位置の調整が行われるように構成されている。軸受装置100の構成については後述する。なお、一次転写ロール67が中間転写ベルト68を押圧する方向(図中の矢印Zで示す方向)と一次転写ロール67の軸方向(図中の矢印Yで示す方向)と一次転写ロール67の位置調整方向(図中の矢印Xで示す方向)とは互いに直交する方向とされる。   The bearing device 100 is adjusted so that the pressing force with which the primary transfer roll 67 presses the intermediate transfer belt 68 is adjusted, and in a direction orthogonal to the axial direction of the primary transfer roll 67 (direction indicated by arrow Y in the drawing). Thus, the position of the primary transfer roll 67 is adjusted in the direction along the moving direction of the intermediate transfer belt 68 (the direction indicated by the arrow X in the figure). The configuration of the bearing device 100 will be described later. The direction in which the primary transfer roll 67 presses the intermediate transfer belt 68 (the direction indicated by the arrow Z in the drawing), the axial direction of the primary transfer roll 67 (the direction indicated by the arrow Y in the drawing), and the position of the primary transfer roll 67. The adjustment directions (directions indicated by arrows X in the figure) are directions orthogonal to each other.

そして、一次転写ロール67は、電源(図示省略)から通電されることにより、接地されている感光体62との電位差で感光体62のトナー画像を中間転写ベルト68に一次転写するようになっている。   When the primary transfer roll 67 is energized from a power source (not shown), the toner image on the photoreceptor 62 is primarily transferred to the intermediate transfer belt 68 by a potential difference from the grounded photoreceptor 62. Yes.

さらに、中間転写ベルト68を挟んで補助ロール69の反対側には、中間転写ベルト68上に一次転写されたトナー画像を記録用紙Pに二次転写させる二次転写ロール71が設けられており、二次転写ロール71と補助ロール69との間が記録用紙Pへトナー画像を転写する二次転写位置QBとされている。二次転写ロール71は、接地されると共に中間転写ベルト68の表面に接触しており、電源(図示省略)から通電された補助ロール69と二次転写ロール71との電位差で、中間転写ベルト68のトナー画像を記録用紙Pに二次転写するようになっている。なお、二次転写位置QBは、前述の搬送路28(図1参照)の途中に設定されている。   Further, on the opposite side of the auxiliary roll 69 across the intermediate transfer belt 68, a secondary transfer roll 71 for secondary transfer of the toner image primarily transferred onto the intermediate transfer belt 68 onto the recording paper P is provided. A space between the secondary transfer roll 71 and the auxiliary roll 69 is a secondary transfer position QB where the toner image is transferred onto the recording paper P. The secondary transfer roll 71 is grounded and is in contact with the surface of the intermediate transfer belt 68. The intermediate transfer belt 68 is caused by a potential difference between the auxiliary roll 69 and the secondary transfer roll 71 energized from a power source (not shown). The toner image is secondarily transferred to the recording paper P. The secondary transfer position QB is set in the middle of the above-described transport path 28 (see FIG. 1).

また、中間転写ベルト68を挟んで駆動ロール61の反対側には、中間転写ベルト68の二次転写後の残留トナーを回収するクリーニングブレード59が設けられている。クリーニングブレード59は、開口部が形成された筐体(図示省略)に取り付けられており、クリーニングブレード59の先端部で掻き取られたトナーが、筐体内に回収されるようになっている。   A cleaning blade 59 that collects residual toner after secondary transfer of the intermediate transfer belt 68 is provided on the opposite side of the drive roll 61 with the intermediate transfer belt 68 interposed therebetween. The cleaning blade 59 is attached to a housing (not shown) in which an opening is formed, and the toner scraped off at the tip of the cleaning blade 59 is collected in the housing.

中間転写ベルト68の周囲で搬送ロール63と対向する位置には、中間転写ベルト68の表面に付されたマーク(図示省略)を検知することで中間転写ベルト68上の予め定めた基準位置を検出し、画像形成処理の開始タイミングの基準となる位置検出信号を出力する位置検出センサ83が設けられている。位置検出センサ83は、中間転写ベルト68に向けて光を照射すると共にマークの表面で反射された光を受光することで、中間転写ベルト68の移動位置を検出するようになっている。   A predetermined reference position on the intermediate transfer belt 68 is detected by detecting a mark (not shown) attached to the surface of the intermediate transfer belt 68 at a position facing the conveyance roll 63 around the intermediate transfer belt 68. In addition, a position detection sensor 83 that outputs a position detection signal that serves as a reference for the start timing of the image forming process is provided. The position detection sensor 83 detects the moving position of the intermediate transfer belt 68 by irradiating the intermediate transfer belt 68 with light and receiving light reflected by the surface of the mark.

一方、感光体62の回転方向で一次転写ロール67よりも下流側には、中間転写ベルト68に一次転写されずに感光体62の表面に残留した残留トナー等を清掃するクリーニング装置73が設けられている。クリーニング装置73は、感光体62表面に接触するクリーニングブレード及びブラシロールにより残留トナー等を回収する構成となっている。   On the other hand, on the downstream side of the primary transfer roll 67 in the rotation direction of the photoconductor 62, a cleaning device 73 for cleaning residual toner and the like remaining on the surface of the photoconductor 62 without being primarily transferred to the intermediate transfer belt 68 is provided. ing. The cleaning device 73 is configured to collect residual toner and the like with a cleaning blade and a brush roll that are in contact with the surface of the photoreceptor 62.

また、感光体62の回転方向でクリーニング装置73の上流側(一次転写ロール67よりも下流側)には、感光体62の外周面に一次転写後に残留したトナーの除電を行うコロトロン81が設けられている。さらに、感光体62の回転方向でクリーニング装置73の下流側(帯電部材64よりも上流側)には、クリーニング後の感光体62の外周面に光を照射して除電を行う除電装置75が設けられている。   Further, a corotron 81 is provided on the upstream side of the cleaning device 73 in the rotation direction of the photosensitive member 62 (downstream side of the primary transfer roll 67) to remove the toner remaining on the outer peripheral surface of the photosensitive member 62 after the primary transfer. ing. Further, on the downstream side of the cleaning device 73 in the rotation direction of the photoconductor 62 (upstream side of the charging member 64), a static elimination device 75 is provided for performing static elimination by irradiating the outer peripheral surface of the photoconductor 62 after cleaning. It has been.

図1に示すように、搬送路28における記録用紙Pの搬送方向(矢印Aで示す方向)で二次転写ロール71よりも下流側には、二次転写ロール71によって記録用紙Pに転写されたトナー画像を永久画像として定着させる定着装置84が設けられている。記録用紙Pの搬送方向で定着装置84よりも下流側には、定着装置84によって定着が行われた記録用紙Pの変形(しわや撓みなど)を矯正して平らにするデカーラ39が設けられている。   As shown in FIG. 1, the recording paper P is transferred onto the recording paper P by the secondary transfer roll 71 on the downstream side of the secondary transfer roll 71 in the transport direction (direction indicated by arrow A) of the recording paper P in the transport path 28. A fixing device 84 that fixes the toner image as a permanent image is provided. A decurler 39 is provided on the downstream side of the fixing device 84 in the conveying direction of the recording paper P to correct and flatten the deformation (wrinkles, deflection, etc.) of the recording paper P fixed by the fixing device 84. Yes.

次に、画像形成装置10における画像形成プロセスについて説明する。   Next, an image forming process in the image forming apparatus 10 will be described.

画像形成装置10が作動すると、画像処理装置(図示省略)又は外部から、イエロー(Y)、マゼンタ(M)、シアン(C)、黒(K)、第1特別色(E)、第2特別色(F)の各色の画像データが露光装置66に順次出力される。このとき、一例として、現像装置70は、現像器72Y(図2参照)が感光体62の外周面と対向するように回転し保持されている。   When the image forming apparatus 10 is activated, yellow (Y), magenta (M), cyan (C), black (K), the first special color (E), and the second special are supplied from an image processing apparatus (not shown) or from the outside. The image data of each color (F) is sequentially output to the exposure device 66. At this time, as an example, the developing device 70 is rotated and held so that the developing device 72 </ b> Y (see FIG. 2) faces the outer peripheral surface of the photoreceptor 62.

続いて、露光装置66から画像データに応じて出射された光は、帯電部材64により帯電された感光体62の外周面(表面)を露光し、感光体62の表面にはイエローの画像データに対応した静電潜像が形成される。さらに、感光体62の表面に形成された静電潜像は、現像器72Yによってイエローのトナー画像として現像される。そして、感光体62の表面のイエローのトナー画像は、一次転写ロール67によって中間転写ベルト68に転写される。   Subsequently, the light emitted from the exposure device 66 according to the image data exposes the outer peripheral surface (front surface) of the photosensitive member 62 charged by the charging member 64, and yellow image data is formed on the surface of the photosensitive member 62. A corresponding electrostatic latent image is formed. Further, the electrostatic latent image formed on the surface of the photoreceptor 62 is developed as a yellow toner image by the developing device 72Y. Then, the yellow toner image on the surface of the photoconductor 62 is transferred to the intermediate transfer belt 68 by the primary transfer roll 67.

続いて、現像装置70が矢印+Rで示す方向に60°回転され、現像器72Mが感光体62の表面と対向する。そして、帯電、露光、現像の各工程が行われ、感光体62の表面のマゼンタのトナー画像は、一次転写ロール67によって中間転写ベルト68のイエローのトナー画像上に重なるように転写される。同様にして、シアン(C)、黒(K)、第1特別色(E)、及び第2特別色(F)のトナー画像が中間転写ベルト68上に順次多重転写される。   Subsequently, the developing device 70 is rotated by 60 ° in the direction indicated by the arrow + R, and the developing device 72M faces the surface of the photosensitive member 62. Then, charging, exposure, and development processes are performed, and the magenta toner image on the surface of the photoconductor 62 is transferred by the primary transfer roll 67 so as to overlap the yellow toner image on the intermediate transfer belt 68. Similarly, toner images of cyan (C), black (K), first special color (E), and second special color (F) are sequentially transferred onto the intermediate transfer belt 68 in a multiple transfer manner.

一方、用紙収容部12から送り出され、搬送路28を搬送されてきた記録用紙Pは、位置合せロール38により、中間転写ベルト68への各トナー画像の多重転写とタイミングを合わせて二次転写位置QBに搬送される。そして、中間転写ベルト68上に多重転写されたトナー画像は、二次転写位置QBに搬送されてきた記録用紙P上に二次転写ロール71によって二次転写される。   On the other hand, the recording paper P sent out from the paper storage unit 12 and transported through the transport path 28 is subjected to a secondary transfer position in synchronization with the multiple transfer of each toner image onto the intermediate transfer belt 68 by the positioning roll 38. Transported to QB. The toner image that has been multiplex-transferred onto the intermediate transfer belt 68 is secondarily transferred by the secondary transfer roll 71 onto the recording paper P that has been transported to the secondary transfer position QB.

続いて、トナー画像が転写された記録用紙Pは、定着装置84に向けて図1中の矢印Aで示す方向に搬送される。そして、定着装置84において、記録用紙P上のトナー画像が永久画像として定着される。定着処理された記録用紙Pは、デカーラ39によって変形(しわや撓みなど)が矯正され、排紙部15に排出される。なお、記録用紙Pの両面に画像を形成する場合には、記録用紙Pは、表面に対して画像形成及び定着が行われた後、反転部33に送り込まれて反転し、二次転写位置QBに再び搬送される。そして、この記録用紙Pの裏面に対して、画像形成及び定着が行われる。   Subsequently, the recording paper P onto which the toner image has been transferred is conveyed toward the fixing device 84 in the direction indicated by the arrow A in FIG. Then, in the fixing device 84, the toner image on the recording paper P is fixed as a permanent image. The fixed recording paper P is deformed (wrinkles, bent, etc.) by the decurler 39 and discharged to the paper discharge unit 15. When images are formed on both sides of the recording paper P, the recording paper P is image-formed and fixed on the surface, and then sent to the reversing unit 33 to be reversed and the secondary transfer position QB. Is transported again. Then, image formation and fixing are performed on the back surface of the recording paper P.

(軸受装置)
次に、軸受装置100の構成について説明する。
(Bearing device)
Next, the configuration of the bearing device 100 will be described.

図3に示すように、一次転写ロール67は、中間転写ベルト68の周回方向と直交する方向を向くように中間転写ベルト68の内側に配置されている。軸受装置100は、この一次転写ロール67を両端側において軸受する一対の軸受部102F、102Rから構成されている。軸受部102Fは画像形成装置10の正面側に配置されるものであり、軸受部102Rは画像形成装置10の背面側に配置されるものである。以降において登場する部材に付す符号の添え字の「F」および「R」は、その部材がそれぞれ画像形成装置10の正面側および背面側に関する部材であることを示す。   As shown in FIG. 3, the primary transfer roll 67 is arranged inside the intermediate transfer belt 68 so as to face a direction orthogonal to the circumferential direction of the intermediate transfer belt 68. The bearing device 100 includes a pair of bearing portions 102F and 102R for bearing the primary transfer roll 67 at both ends. The bearing portion 102 </ b> F is disposed on the front side of the image forming apparatus 10, and the bearing portion 102 </ b> R is disposed on the back side of the image forming apparatus 10. Subscripts “F” and “R” attached to members appearing thereafter indicate that the members are members relating to the front side and the back side of the image forming apparatus 10, respectively.

図3〜図5に示すように、軸受部102Fは、軸受部材104Fと2つの調整ネジ106F,108Fと2つの移動部材110F,112Fと弾性部材の一例としての圧縮コイルバネ114Fとを備えている。   As shown in FIGS. 3 to 5, the bearing portion 102F includes a bearing member 104F, two adjustment screws 106F and 108F, two moving members 110F and 112F, and a compression coil spring 114F as an example of an elastic member.

軸受部材104Fは、「U」字形状の凹部において一次転写ロール67をシャフト部67aで軸受している。なお、軸受部材104FのX方向における両側の外側面には、Z方向に沿う溝116Fが形成されている。   The bearing member 104F supports the primary transfer roll 67 with a shaft portion 67a in a “U” -shaped recess. Note that grooves 116F along the Z direction are formed on the outer side surfaces on both sides in the X direction of the bearing member 104F.

2つの調整ネジ106F,108Fはそれぞれ、転写装置58のベースフレーム(図示省略)に支持されている。そして、2つの調整ネジ106F,108Fはそれぞれ、一次転写ロール67の軸方向に沿って配置され、回転することで一次転写ロール67の軸方向に変位するようになっている。調整ネジ106Fは、一次転写ロール67のX方向における位置を調整するためのものである。調整ネジ108Fは、一次転写ロール67が中間転写ベルト68を押圧する押圧力を調整するためのものである。なお、2つの調整ネジ106F,108Fはそれぞれ、一次転写ロール67の略軸方向に沿って配置されているものであればよく、広義には一次転写ロール67の軸方向に対し90度未満の角度で交差する方向に沿って配置されているものであればよい。そして、2つの調整ネジ106F,108Fはそれぞれ、回転することで一次転写ロール67の略軸方向に変位するようになっているものであればよく、広義には一次転写ロール67の軸方向に対し90度未満の角度で交差する方向に変位するものであればよい。   The two adjustment screws 106F and 108F are respectively supported by a base frame (not shown) of the transfer device 58. The two adjusting screws 106F and 108F are arranged along the axial direction of the primary transfer roll 67, and are displaced in the axial direction of the primary transfer roll 67 by rotating. The adjustment screw 106F is for adjusting the position of the primary transfer roll 67 in the X direction. The adjustment screw 108F is for adjusting the pressing force with which the primary transfer roll 67 presses the intermediate transfer belt 68. The two adjusting screws 106 </ b> F and 108 </ b> F are only required to be disposed along the substantially axial direction of the primary transfer roll 67. In a broad sense, the angle is less than 90 degrees with respect to the axial direction of the primary transfer roll 67. What is necessary is just to be arrange | positioned along the direction which cross | intersects. The two adjusting screws 106F and 108F only need to be able to be displaced in the substantially axial direction of the primary transfer roll 67 by rotating, and in a broad sense, with respect to the axial direction of the primary transfer roll 67. What is necessary is just to be displaced in the direction which crosses at an angle of less than 90 degree | times.

移動部材110Fは、XY平面に広がるプレート部118Fとプレート部118FからZ方向に立脚する2つの立脚部120F,122Fとから構成されている。そして、移動部材110Fは、転写装置58のベースフレーム(図示省略)にX方向のみにおいて移動自在に支持されている。移動部材110Fの2つの立脚部120F,122Fの相対する側の面には、軸受部材104Fの両側の外側面の溝116Fに対応する凸部124Fが形成されている。この凸部124Fに溝116Fを介挿させる形で軸受部材104Fが移動部材110Fに取り付けられている。   The moving member 110F includes a plate portion 118F that extends in the XY plane and two standing leg portions 120F and 122F that stand in the Z direction from the plate portion 118F. The moving member 110F is supported by the base frame (not shown) of the transfer device 58 so as to be movable only in the X direction. Convex portions 124F corresponding to the grooves 116F on the outer side surfaces of the bearing member 104F are formed on the opposing surfaces of the two standing leg portions 120F and 122F of the moving member 110F. The bearing member 104F is attached to the moving member 110F in such a manner that the groove 116F is inserted into the convex portion 124F.

図5に示すように、移動部材110Fのプレート部118Fの調整ネジ106F側の側面は、調整ネジ106Fが変位する方向であるY方向に交差する法線を有する傾斜面126Fとされている。この傾斜面126Fに調整ネジ106Fの先端が接触させられており、調整ネジ106Fが時計回りに回転されて+Y方向に変位すると、移動部材110Fが傾斜面126Fで押されて+X方向に移動する。また、移動部材110Fは引張バネ(図示省略)によって−X方向に付勢されており、調整ネジ106Fが反時計回りに回転されて−Y方向に変位すると、引張バネの付勢力によって移動部材110Fは傾斜面126Fにおいて調整ネジ106Fとの接触を維持するように−X方向に移動する。即ち、調整ネジ106FのY方向における変位に応じて移動部材110FがX方向において移動するようになっている。   As shown in FIG. 5, the side surface on the adjustment screw 106F side of the plate portion 118F of the moving member 110F is an inclined surface 126F having a normal line that intersects the Y direction, which is the direction in which the adjustment screw 106F is displaced. The tip of the adjustment screw 106F is brought into contact with the inclined surface 126F. When the adjustment screw 106F is rotated clockwise and displaced in the + Y direction, the moving member 110F is pushed by the inclined surface 126F and moved in the + X direction. The moving member 110F is biased in the −X direction by a tension spring (not shown). When the adjusting screw 106F is rotated counterclockwise and displaced in the −Y direction, the moving member 110F is biased by the biasing force of the tension spring. Moves in the −X direction so as to maintain contact with the adjusting screw 106F on the inclined surface 126F. That is, the moving member 110F moves in the X direction according to the displacement of the adjusting screw 106F in the Y direction.

図4に示すように、移動部材112Fは、Z方向のみにおいて移動自在となるように移動部材110Fに支持されている。移動部材112Fと軸受部材104Fとは、圧縮コイルバネ114Fを介して接続されている。即ち、圧縮コイルバネ114Fの上面が軸受部材104Fの下面に接触し、圧縮コイルバネ114Fの下面が移動部材112Fの上面に接触するように、圧縮コイルバネ114Fは移動部材112Fと軸受部材104Fとの間に介挿されている。   As shown in FIG. 4, the moving member 112F is supported by the moving member 110F so as to be movable only in the Z direction. The moving member 112F and the bearing member 104F are connected via a compression coil spring 114F. That is, the compression coil spring 114F is interposed between the moving member 112F and the bearing member 104F so that the upper surface of the compression coil spring 114F is in contact with the lower surface of the bearing member 104F and the lower surface of the compression coil spring 114F is in contact with the upper surface of the moving member 112F. It is inserted.

移動部材112Fの調整ネジ108F側の側面は、調整ネジ108Fが変位する方向であるY方向に交差する法線を有する傾斜面128Fとされている。この傾斜面128Fに調整ネジ108Fの先端が接触させられており、調整ネジ108Fが時計回りに回転されて+Y方向に変位すると、移動部材112Fが傾斜面128Fで押されて+Z方向に移動する。一次転写ロール67は中間転写ベルト68に接触しており(図3参照)、軸受部材104FのZ方向における移動は規制されているため、移動部材112Fが+Z方向に移動すると、圧縮コイルバネ114Fが圧縮変形する。即ち、移動部材112Fが+Z方向に移動しても軸受部材104Fは+Z方向に移動しないが、圧縮コイルバネ114Fが圧縮変形するため、その圧縮変形増加量分だけ一次転写ロール67が中間転写ベルト68を押圧する押圧力が増加するようになっている。   The side surface of the moving member 112F on the adjustment screw 108F side is an inclined surface 128F having a normal line that intersects the Y direction, which is the direction in which the adjustment screw 108F is displaced. The tip of the adjustment screw 108F is brought into contact with the inclined surface 128F, and when the adjustment screw 108F is rotated clockwise and displaced in the + Y direction, the moving member 112F is pushed by the inclined surface 128F and moved in the + Z direction. Since the primary transfer roll 67 is in contact with the intermediate transfer belt 68 (see FIG. 3) and the movement of the bearing member 104F in the Z direction is restricted, when the moving member 112F moves in the + Z direction, the compression coil spring 114F is compressed. Deform. That is, even if the moving member 112F moves in the + Z direction, the bearing member 104F does not move in the + Z direction, but the compression coil spring 114F compresses and deforms, so that the primary transfer roll 67 moves the intermediate transfer belt 68 by the amount of increase in compression deformation. The pressing force to press increases.

一方、調整ネジ108Fが反時計回りに回転されて−Y方向に変位すると、圧縮コイルバネ114Fの付勢力によって移動部材112Fは傾斜面128Fにおいて調整ネジ108Fとの接触を維持するように−Z方向に移動する。移動部材112Fが−Z方向に移動すると、圧縮コイルバネ114Fが復元し、その復元量分だけ一次転写ロール67が中間転写ベルト68を押圧する押圧力が減少するようになっている。   On the other hand, when the adjustment screw 108F is rotated counterclockwise and displaced in the −Y direction, the moving member 112F is maintained in the −Z direction so that the moving member 112F maintains contact with the adjustment screw 108F on the inclined surface 128F by the biasing force of the compression coil spring 114F. Moving. When the moving member 112F moves in the −Z direction, the compression coil spring 114F is restored, and the pressing force with which the primary transfer roll 67 presses the intermediate transfer belt 68 is reduced by the amount of restoration.

このように、移動部材112Fが調整ネジ108FのY方向における変位に応じて圧縮コイルバネ114Fを変形させる方向(Z方向)に移動することで、一次転写ロール67が中間転写ベルト68を押圧する押圧力が変化するようになっている。   As described above, the moving member 112F moves in the direction (Z direction) to deform the compression coil spring 114F in accordance with the displacement of the adjustment screw 108F in the Y direction, so that the primary transfer roll 67 presses the intermediate transfer belt 68. Is changing.

図3、図6、図7に示すように、軸受部102Rは、軸受部材104Rと2つの調整ネジ106R,108Rと2つの移動部材110R,112Rと弾性部材の一例としての圧縮コイルバネ114Rとを備えている。   As shown in FIGS. 3, 6, and 7, the bearing portion 102R includes a bearing member 104R, two adjustment screws 106R and 108R, two moving members 110R and 112R, and a compression coil spring 114R as an example of an elastic member. ing.

軸受部材104Rは、「U」字形状の凹部において一次転写ロール67をシャフト部67aで軸受している。なお、軸受部材104RのX方向における両側の外側面には、Z方向に沿う溝116Rが形成されている。   The bearing member 104R supports the primary transfer roll 67 with a shaft portion 67a in a "U" -shaped recess. Note that grooves 116R along the Z direction are formed on the outer side surfaces on both sides in the X direction of the bearing member 104R.

2つの調整ネジ106R,108Rはそれぞれ、調整ネジ106F,108Fに比べて長尺であり、画像形成装置10の正面側から背面側に伸びるように転写装置58のベースフレーム(図示省略)に支持されている。そして、2つの調整ネジ106R,108Rはそれぞれ、一次転写ロール67の軸方向に沿って配置され、回転することで一次転写ロール67の軸方向において変位するようになっている。調整ネジ106Rは、一次転写ロール67のX方向における位置を調整するためのものである。調整ネジ108Rは、一次転写ロール67が中間転写ベルト68を押圧する押圧力を調整するためのものである。なお、2つの調整ネジ106R,108Rはそれぞれ、一次転写ロール67の略軸方向に沿って配置されているものであればよく、広義には一次転写ロール67の軸方向に対し90度未満の角度で交差する方向に沿って配置されているものであればよい。そして、2つの調整ネジ106R,108Rはそれぞれ、回転することで一次転写ロール67の略軸方向に変位するようになっているものであればよく、広義には一次転写ロール67の軸方向に対し90度未満の角度で交差する方向に変位するものであればよい。   The two adjustment screws 106R and 108R are longer than the adjustment screws 106F and 108F, and are supported by a base frame (not shown) of the transfer device 58 so as to extend from the front side to the back side of the image forming apparatus 10. ing. The two adjusting screws 106R and 108R are arranged along the axial direction of the primary transfer roll 67, and are displaced in the axial direction of the primary transfer roll 67 by rotating. The adjusting screw 106R is for adjusting the position of the primary transfer roll 67 in the X direction. The adjustment screw 108 </ b> R is for adjusting the pressing force with which the primary transfer roll 67 presses the intermediate transfer belt 68. Note that the two adjustment screws 106R and 108R are only required to be disposed along the substantially axial direction of the primary transfer roll 67, and in an broad sense, an angle of less than 90 degrees with respect to the axial direction of the primary transfer roll 67. What is necessary is just to be arrange | positioned along the direction which cross | intersects. The two adjusting screws 106R and 108R are only required to be displaced in the substantially axial direction of the primary transfer roll 67 by rotating, and in a broad sense, with respect to the axial direction of the primary transfer roll 67. What is necessary is just to be displaced in the direction which cross | intersects at an angle of less than 90 degree | times.

移動部材110Rは、XY平面に広がるプレート部118Rとプレート部118RからZ方向に立脚する2つの立脚部120R,122Rとから構成されている。そして、移動部材110Rは、転写装置58のベースフレーム(図示省略)にX方向のみにおいて移動自在に支持されている。移動部材110Rの2つの立脚部120R,122Rの相対する側の面には、軸受部材104Rの両側の外側面の溝116Rに対応する凸部124Rが形成されている。この凸部124Rに溝116Rを介挿させる形で軸受部材104Rが移動部材110Rに取り付けられている。   The moving member 110R includes a plate portion 118R extending in the XY plane, and two standing leg portions 120R and 122R that stand in the Z direction from the plate portion 118R. The moving member 110R is supported by the base frame (not shown) of the transfer device 58 so as to be movable only in the X direction. Convex portions 124R corresponding to the grooves 116R on the outer side surfaces on both sides of the bearing member 104R are formed on the opposing surfaces of the two standing leg portions 120R and 122R of the moving member 110R. The bearing member 104R is attached to the moving member 110R in such a manner that the groove 116R is inserted into the convex portion 124R.

移動部材110Rの立脚部122Rの外側面には、外側に突出する突出部130Rが形成されている。この突出部130Rの調整ネジ106R側の側面は、調整ネジ106Rが変位する方向であるY方向に対して交差する法線を有する傾斜面126Rとされている。この傾斜面126Rに調整ネジ106Rの先端が接触させられている。   A protruding portion 130R that protrudes outward is formed on the outer surface of the standing leg portion 122R of the moving member 110R. A side surface of the protruding portion 130R on the adjustment screw 106R side is an inclined surface 126R having a normal line that intersects the Y direction, which is the direction in which the adjustment screw 106R is displaced. The tip of the adjustment screw 106R is brought into contact with the inclined surface 126R.

図7に示すように、調整ネジ106Rが時計回りに回転されて+Y方向に変位すると、移動部材110Rが傾斜面126Rで押されて+X方向に移動する。また、移動部材110Rは引張バネ(図示省略)によって−X方向に付勢されており、調整ネジ106Rが反時計回りに回転されて−Y方向に変位すると、引張バネの付勢力によって移動部材110Rは傾斜面126Rにおいて調整ネジ106Rとの接触を維持するように−X方向に移動する。即ち、調整ネジ106RのY方向における変位に応じて移動部材110RがX方向において移動するようになっている。   As shown in FIG. 7, when the adjustment screw 106R is rotated clockwise and displaced in the + Y direction, the moving member 110R is pushed by the inclined surface 126R and moved in the + X direction. The moving member 110R is urged in the −X direction by a tension spring (not shown). When the adjusting screw 106R is rotated counterclockwise and displaced in the −Y direction, the moving member 110R is urged by the urging force of the tension spring. Moves in the −X direction so as to maintain contact with the adjusting screw 106R on the inclined surface 126R. That is, the moving member 110R moves in the X direction according to the displacement of the adjusting screw 106R in the Y direction.

図6に示すように、移動部材112Rは、Z方向のみにおいて移動自在となるように移動部材110Rに支持されている。移動部材112Rと軸受部材104Rとは、圧縮コイルバネ114Rを介して接続されている。即ち、圧縮コイルバネ114Rの上面が軸受部材104Rの下面に接触し、圧縮コイルバネ114Rの下面が移動部材112Rの上面に接触するように、圧縮コイルバネ114Rは移動部材112Rと軸受部材104Rとの間に介挿されている。   As shown in FIG. 6, the moving member 112R is supported by the moving member 110R so as to be movable only in the Z direction. The moving member 112R and the bearing member 104R are connected via a compression coil spring 114R. That is, the compression coil spring 114R is interposed between the moving member 112R and the bearing member 104R so that the upper surface of the compression coil spring 114R is in contact with the lower surface of the bearing member 104R and the lower surface of the compression coil spring 114R is in contact with the upper surface of the moving member 112R. It is inserted.

移動部材112Rの調整ネジ108R側の側面は、調整ネジ108Rが変位する方向であるY方向に交差する法線を有する傾斜面128Rとされている。この傾斜面128Rに調整ネジ108Rの先端が接触させられており、調整ネジ108Rが時計回りに回転されて+Y方向に変位すると、移動部材112Rが傾斜面128Rで押されて+Z方向に移動する。一次転写ロール67は中間転写ベルト68に接触しており(図3参照)、軸受部材104RのZ方向における移動は規制されているため、移動部材112Rが+Z方向に移動すると、圧縮コイルバネ114Rが圧縮変形する。即ち、移動部材112Rが+Z方向に移動しても軸受部材104Rは+Z方向に移動しないが、圧縮コイルバネ114Rが圧縮変形するため、その圧縮変形増加分だけ一次転写ロール67が中間転写ベルト68を押圧する押圧力が増加するようになっている。   The side surface of the moving member 112R on the adjustment screw 108R side is an inclined surface 128R having a normal line that intersects the Y direction, which is the direction in which the adjustment screw 108R is displaced. The tip of the adjustment screw 108R is brought into contact with the inclined surface 128R. When the adjustment screw 108R is rotated clockwise and displaced in the + Y direction, the moving member 112R is pushed by the inclined surface 128R and moved in the + Z direction. Since the primary transfer roll 67 is in contact with the intermediate transfer belt 68 (see FIG. 3) and the movement of the bearing member 104R in the Z direction is restricted, when the moving member 112R moves in the + Z direction, the compression coil spring 114R is compressed. Deform. That is, even if the moving member 112R moves in the + Z direction, the bearing member 104R does not move in the + Z direction, but the compression coil spring 114R compressively deforms, so the primary transfer roll 67 presses the intermediate transfer belt 68 by the amount of the increased compression deformation. The pressing force is increased.

一方、調整ネジ108Rが反時計回りに回転されて−Y方向に変位すると、圧縮コイルバネ114Rの付勢力によって移動部材112Rは傾斜面128Rにおいて調整ネジ108Rとの接触を維持するように−Z方向に移動する。移動部材112Rが−Z方向に移動すると、圧縮コイルバネ114Rが復元し、その復元量分だけ一次転写ロール67が中間転写ベルト68を押圧する押圧力が減少するようになっている。   On the other hand, when the adjustment screw 108R is rotated counterclockwise and displaced in the -Y direction, the moving member 112R is moved in the -Z direction so that the moving member 112R maintains contact with the adjustment screw 108R on the inclined surface 128R by the biasing force of the compression coil spring 114R. Moving. When the moving member 112R moves in the −Z direction, the compression coil spring 114R is restored, and the pressing force with which the primary transfer roll 67 presses the intermediate transfer belt 68 is reduced by the amount of restoration.

このように、移動部材112Rが調整ネジ108RのY方向における変位に応じて圧縮コイルバネ114Rを変形させる方向(Z方向)に移動することで、一次転写ロール67が中間転写ベルト68を押圧する押圧力が変化するようになっている。   As described above, the moving member 112R moves in the direction (Z direction) in which the compression coil spring 114R is deformed in accordance with the displacement of the adjustment screw 108R in the Y direction, so that the primary transfer roll 67 presses the intermediate transfer belt 68. Is changing.

以上の如く、本実施形態に係る軸受装置100においては、一次転写ロール67の軸方向に沿って配置される一対の調整ネジ108F,108Rを回転操作することで、一次転写ロール67が中間転写ベルト68を押圧する押圧力の調整が行われるようになっている。従って、押圧力の調整を行うに際して転写装置58を装置本体10Aから引き出す必要がなく、押圧力の調整を容易に行える。これに対し、調整ネジ108F,108Rが一次転写ロール67の軸方向に直交する方向に沿って配置されている場合には、押圧力の調整を行うに際して転写装置58を装置本体10Aから引き出す必要があり、押圧力の調整が困難となる。   As described above, in the bearing device 100 according to the present embodiment, the primary transfer roll 67 is rotated by the pair of adjusting screws 108F and 108R arranged along the axial direction of the primary transfer roll 67, whereby the primary transfer roll 67 is moved to the intermediate transfer belt. The pressing force for pressing 68 is adjusted. Therefore, it is not necessary to pull out the transfer device 58 from the apparatus main body 10A when adjusting the pressing force, and the pressing force can be easily adjusted. On the other hand, when the adjusting screws 108F and 108R are arranged along the direction orthogonal to the axial direction of the primary transfer roll 67, it is necessary to pull out the transfer device 58 from the apparatus main body 10A when adjusting the pressing force. Yes, it is difficult to adjust the pressing force.

また、これら一対の調整ネジ108F,108Rが共に一次転写ロール67の軸方向における一端側(画像形成装置10の正面側)から回転操作可能とされているので、押圧力の調整をさらに容易に行える。これに対し、一対の調整ネジ108F,108Rがそれぞれ一次転写ロール67の軸方向における両側(画像形成装置10の正面側と背面側)から回転操作可能とされている場合には、押圧力の調整が困難となる。   Further, both of the pair of adjusting screws 108F and 108R can be rotated from one end side (the front side of the image forming apparatus 10) in the axial direction of the primary transfer roll 67, so that the pressing force can be adjusted more easily. . On the other hand, when the pair of adjusting screws 108F and 108R can be rotated from both sides in the axial direction of the primary transfer roll 67 (the front side and the back side of the image forming apparatus 10), the pressing force is adjusted. It becomes difficult.

また、一次転写ロール67の軸方向に沿って配置される一対の調整ネジ106F,106Rを回転操作することで、一次転写ロール67の軸方向に直交する方向における一次転写ロール67の位置の調整が行われるようになっている。従って、位置の調整を行うに際して転写装置58を装置本体10Aから引き出す必要がなく、位置の調整を容易に行える。これに対し、調整ネジ106F,106Rが一次転写ロール67の軸方向に直交する方向に沿って配置されている場合には、位置の調整を行うに際して転写装置58を装置本体10Aから引き出す必要があり、位置の調整が困難となる。   Further, by rotating the pair of adjusting screws 106F and 106R arranged along the axial direction of the primary transfer roll 67, the position of the primary transfer roll 67 in the direction orthogonal to the axial direction of the primary transfer roll 67 can be adjusted. To be done. Therefore, it is not necessary to pull out the transfer device 58 from the apparatus main body 10A when adjusting the position, and the position can be adjusted easily. On the other hand, when the adjusting screws 106F and 106R are arranged along the direction orthogonal to the axial direction of the primary transfer roll 67, it is necessary to pull out the transfer device 58 from the apparatus main body 10A when adjusting the position. It becomes difficult to adjust the position.

また、これら一対の調整ネジ106F,106Rが共に一次転写ロール67の軸方向における一端側(画像形成装置10の正面側)から回転操作可能とされているので、位置の調整をさらに容易に行える。これに対し、一対の調整ネジ106F,106Rがそれぞれ一次転写ロール67の軸方向における両側(画像形成装置10の正面側と背面側)から回転操作可能とされている場合には、位置の調整が困難となる。   In addition, since both of the pair of adjusting screws 106F and 106R can be rotated from one end side (the front side of the image forming apparatus 10) in the axial direction of the primary transfer roll 67, the position can be adjusted more easily. On the other hand, when the pair of adjustment screws 106F and 106R can be rotated from both sides (the front side and the back side of the image forming apparatus 10) in the axial direction of the primary transfer roll 67, the position adjustment is performed. It becomes difficult.

また、この軸受装置100を備える画像形成装置10においては、一次転写ロール67の中間転写ベルト68を押圧する押圧力の調整および一次転写ロール67の位置の調整を行えるので、形成画像の画質の調整が容易となる。   Further, in the image forming apparatus 10 including the bearing device 100, the pressing force for pressing the intermediate transfer belt 68 of the primary transfer roll 67 and the position of the primary transfer roll 67 can be adjusted, so that the image quality of the formed image is adjusted. Becomes easy.

なお、上記では、軸受装置100として一次転写ロール67を軸受するものについて説明したが、この軸受装置100を搬送ロール63、張力付与ロール65、補助ロール69および駆動ロール61に適用してもよい。   In the above description, the bearing device 100 that supports the primary transfer roll 67 is described. However, the bearing device 100 may be applied to the transport roll 63, the tension applying roll 65, the auxiliary roll 69, and the drive roll 61.

また、移動部材110F,110R,112F,112Rの傾斜面126F,126R,128F,128Rに調整ネジ106F,106R,108F,108Rを直接接触させる構成としたが、傾斜面126F,126R,128F,128Rに対向接触する傾斜面を有しY方向のみに移動自在な楔状部材を傾斜面126F,126R,128F,128Rと調整ネジ106F,106R,108F,108Rとの間に介在させる構成としてもよい。   In addition, the adjustment screws 106F, 106R, 108F, and 108R are in direct contact with the inclined surfaces 126F, 126R, 128F, and 128R of the moving members 110F, 110R, 112F, and 112R, but the inclined surfaces 126F, 126R, 128F, and 128R are in contact with each other. A wedge-shaped member that has an inclined surface that is opposed to each other and is movable only in the Y direction may be interposed between the inclined surfaces 126F, 126R, 128F, and 128R and the adjusting screws 106F, 106R, 108F, and 108R.

また、移動部材110F,110R,112F,112Rに傾斜面126F,126R,128F,128Rを形成し、調整ネジ106F,106R,108F,108RのY方向の変位に応じて移動部材110F,110R,112F,112RをY方向に直交する方向に移動させるように構成したが、ウオームギア機構あるいは傘歯ギア機構を利用し、調整ネジ106F,106R,108F,108RのY方向の変位に応じて移動部材110F,110R,112F,112RをY方向に直交する方向に移動させるように構成してもよい。   Further, inclined surfaces 126F, 126R, 128F, and 128R are formed on the moving members 110F, 110R, 112F, and 112R, and the moving members 110F, 110R, 112F, and 112R are formed according to the displacement of the adjusting screws 106F, 106R, 108F, and 108R in the Y direction. 112R is configured to move in a direction perpendicular to the Y direction, but the worm gear mechanism or the bevel gear mechanism is used, and the moving members 110F and 110R are used in accordance with the displacement of the adjustment screws 106F, 106R, 108F, and 108R in the Y direction. , 112F, 112R may be configured to move in a direction orthogonal to the Y direction.

10 画像形成装置
58 転写装置
62 感光体(像保持体の一例)
68 中間転写ベルト(無端状ベルトの一例)
70 現像装置
100 軸受装置
102 軸受部
104 軸受部材
106 調整ネジ
108 調整ネジ
110 移動部材
112 移動部材
114 圧縮コイルバネ(弾性部材の一例)
126 傾斜面
128 傾斜面
P 記録用紙(記録媒体の一例)
DESCRIPTION OF SYMBOLS 10 Image forming apparatus 58 Transfer apparatus 62 Photosensitive body (an example of an image holding body)
68 Intermediate transfer belt (an example of an endless belt)
70 Developing device 100 Bearing device 102 Bearing portion 104 Bearing member 106 Adjustment screw 108 Adjustment screw 110 Moving member 112 Moving member 114 Compression coil spring (an example of an elastic member)
126 Inclined surface 128 Inclined surface P Recording paper (an example of a recording medium)

Claims (5)

無端状ベルトの内側において前記無端状ベルトの周回方向と直交する方向を向くように配置される軸部材を軸受する軸受部材と、
前記軸部材の軸方向に対し90度未満の角度で交差する方向に沿って配置され、回転することで前記軸部材の軸方向に対し90度未満の角度で交差する方向に変位する調整ネジと、
前記軸受部材に弾性部材を介して接続されると共に前記調整ネジに接触され、前記軸部材が前記無端状ベルトを押圧する押圧力の調整が行われるように、前記調整ネジの変位に応じて前記弾性部材を変形させる方向に移動する移動部材と、
を有する軸受装置。
A bearing member for bearing a shaft member disposed so as to face a direction orthogonal to the circumferential direction of the endless belt inside the endless belt;
An adjusting screw that is disposed along a direction intersecting at an angle of less than 90 degrees with respect to the axial direction of the shaft member, and that is displaced in a direction that intersects at an angle of less than 90 degrees with respect to the axial direction of the shaft member by rotating; ,
The bearing member is connected via an elastic member and is brought into contact with the adjustment screw so that the pressing force by which the shaft member presses the endless belt is adjusted according to the displacement of the adjustment screw. A moving member that moves in a direction to deform the elastic member;
Bearing device.
無端状ベルトの内側において前記無端状ベルトの周回方向と直交する方向を向くように配置される軸部材を軸受する軸受部材と、
前記軸部材の軸方向に対し90度未満の角度で交差する方向に沿って配置され、回転することで前記軸部材の軸方向に対し90度未満の角度で交差する方向に変位する調整ネジと、
前記軸受部材に取り付けられると共に前記調整ネジに接触され、前記軸部材の軸方向に直交する方向における前記軸部材の位置の調整が行われるように、前記調整ネジの変位に応じて前記軸部材の軸方向に直交する方向に移動する移動部材と、
を有する軸受装置。
A bearing member for bearing a shaft member disposed so as to face a direction orthogonal to the circumferential direction of the endless belt inside the endless belt;
An adjusting screw that is disposed along a direction intersecting at an angle of less than 90 degrees with respect to the axial direction of the shaft member, and that is displaced in a direction that intersects at an angle of less than 90 degrees with respect to the axial direction of the shaft member by rotating; ,
The shaft member is attached to the bearing member and is in contact with the adjustment screw so that the position of the shaft member in the direction orthogonal to the axial direction of the shaft member is adjusted according to the displacement of the adjustment screw. A moving member that moves in a direction perpendicular to the axial direction;
Bearing device.
前記軸受部材は、前記軸部材の両側の端部を受ける一対の部材から構成されており、
前記調整ネジおよび前記移動部材はそれぞれ、前記一対の部材に対応して一対設けられており、
前記一対の調整ネジは共に前記軸部材の軸方向における一端側から回転操作可能とされている請求項1または請求項2に記載の軸受装置。
The bearing member is composed of a pair of members that receive end portions on both sides of the shaft member,
Each of the adjusting screw and the moving member is provided corresponding to the pair of members,
The bearing device according to claim 1, wherein both of the pair of adjusting screws are rotatable from one end side in the axial direction of the shaft member.
前記調整ネジは、前記軸部材の略軸方向に沿って配置され、回転することで前記軸部材の略軸方向に変位する請求項1〜3のいずれか1項に記載の軸受装置。   The bearing device according to claim 1, wherein the adjustment screw is disposed along a substantially axial direction of the shaft member and is displaced in a substantially axial direction of the shaft member by rotating. 静電潜像が形成される像保持体と、
前記像保持体に形成された静電潜像をトナーで現像する現像装置と、
前記現像装置によって現像されたトナー像を無端状ベルトに転写する転写装置と、
前記転写装置の無端状ベルトの内側において前記無端状ベルトの周回方向と直交する方向を向くように配置される軸部材を軸受する請求項1〜4のいずれか1項に記載の軸受装置と、
を有する画像形成装置。
An image carrier on which an electrostatic latent image is formed;
A developing device for developing the electrostatic latent image formed on the image carrier with toner;
A transfer device for transferring the toner image developed by the developing device to an endless belt;
The bearing device according to any one of claims 1 to 4, wherein a shaft member disposed so as to face a direction orthogonal to a circumferential direction of the endless belt is supported inside the endless belt of the transfer device.
An image forming apparatus.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0444655U (en) * 1990-05-01 1992-04-15
JPH09185213A (en) * 1996-01-05 1997-07-15 Ricoh Co Ltd Color electrophotographic device
JP2003005539A (en) * 2001-06-26 2003-01-08 Konica Corp Image forming method and image forming device
JP2008058717A (en) * 2006-08-31 2008-03-13 Funai Electric Co Ltd Image forming apparatus
JP2009098240A (en) * 2007-10-15 2009-05-07 Ricoh Co Ltd Method for control of belt skew, belt driving device, and image forming device
JP2010210884A (en) * 2009-03-10 2010-09-24 Ricoh Co Ltd Transfer device and image forming apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0444655U (en) * 1990-05-01 1992-04-15
JPH09185213A (en) * 1996-01-05 1997-07-15 Ricoh Co Ltd Color electrophotographic device
JP2003005539A (en) * 2001-06-26 2003-01-08 Konica Corp Image forming method and image forming device
JP2008058717A (en) * 2006-08-31 2008-03-13 Funai Electric Co Ltd Image forming apparatus
JP2009098240A (en) * 2007-10-15 2009-05-07 Ricoh Co Ltd Method for control of belt skew, belt driving device, and image forming device
JP2010210884A (en) * 2009-03-10 2010-09-24 Ricoh Co Ltd Transfer device and image forming apparatus

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