JP2010230958A - Mechanism for correcting belt-meandering and image forming apparatus - Google Patents

Mechanism for correcting belt-meandering and image forming apparatus Download PDF

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JP2010230958A
JP2010230958A JP2009078127A JP2009078127A JP2010230958A JP 2010230958 A JP2010230958 A JP 2010230958A JP 2009078127 A JP2009078127 A JP 2009078127A JP 2009078127 A JP2009078127 A JP 2009078127A JP 2010230958 A JP2010230958 A JP 2010230958A
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belt
roll
meandering correction
force
belt meandering
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Toshihiro Kanematsu
寿弘 兼松
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanism for correcting belt-meandering capable of suppressing wearing of a belt, and to provide an image forming apparatus. <P>SOLUTION: The mechanism 100 for correcting belt-meandering includes: a base 50 having a force conversion member 52 which receives a first pressurizing force a resulting from the meandering of the intermediate transfer belt 33 and converts the first pressurizing force a to a roll oscillating force b, and also, receives a second pressurizing force d resulting from a roll oscillation recovery force c and converts the second pressurizing force d to a correction force e to correct the meandering of the intermediate transfer belt 33; and a belt-meandering correction roll 31 which oscillates when receiving the roll oscillating force b from the force conversion member 52, and also, which oscillates and recovers when receiving the roll oscillation recovery force c, wherein a belt meandering correcting member 58 for correcting the meandering of the intermediate transfer belt 33 is arranged at the end portion of the roll shaft 31a of the belt meandering correction roll 31, and the belt meandering correcting member 58 includes: a first surface 58a which receives the first pressurizing force a and the correcting force e from the side edge 33a of the roll lying part of the intermediate transfer belt; and a second surface 58b which receives the roll oscillating force b and the second pressurizing force d from the force conversion member 52. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、ベルト蛇行補正機構及び画像形成装置に関する。   The present invention relates to a belt meandering correction mechanism and an image forming apparatus.

従来のベルト蛇行補正機構として、ベルトを走行可能に掛け渡す１対のロールと、これら１対のロールのうち一方のロールに相対回転不能なベルト蛇行補正部材としてのブッシュとを備えたものがある（例えば、特許文献１参照）。   As a conventional belt meandering correction mechanism, there is one provided with a pair of rolls that circulate a belt so that the belt can run, and a bushing as a belt meandering correction member that is relatively non-rotatable to one of the pair of rolls. (For example, refer to Patent Document 1).

１対のロールは、一方のロールが駆動ロールによって、また他方のロールが従動ロールによってそれぞれ形成されている。ブッシュは、ベルトの側縁を押圧する螺旋状の端面をベルト側に有し、駆動ロール及び従動ロールのうち従動ロールに装着されている。   In the pair of rolls, one roll is formed by a driving roll and the other roll is formed by a driven roll. The bush has a spiral end surface that presses the side edge of the belt on the belt side, and is attached to the driven roll among the drive roll and the driven roll.

以上の構成により、駆動ロールが回転駆動されると、ベルトが駆動ロール及び従動ロールに掛け渡されながら走行する。このベルトの走行によって幅方向に移動する、いわゆるベルトに蛇行があっても、ブッシュの回転に応じて螺旋状の端面がベルトの側縁を押圧するため、ベルトの蛇行が補正される。   With the above configuration, when the drive roll is driven to rotate, the belt travels while being stretched over the drive roll and the driven roll. Even if there is meandering in the so-called belt that moves in the width direction by the running of the belt, the spiral end face presses the side edge of the belt in accordance with the rotation of the bush, so that the meandering of the belt is corrected.

特開２００７−８６２６７号公報JP 2007-86267 A

本発明の目的は、ベルト蛇行補正部材への押圧によるベルトの磨耗発生を抑制することができるベルト蛇行補正機構及び画像形成装置を提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide a belt meandering correction mechanism and an image forming apparatus capable of suppressing the occurrence of belt wear due to pressing on a belt meandering correction member.

本発明の一態様は、上記目的を達成するために、以下のベルト蛇行補正機構及び画像形成装置を提供する。   In order to achieve the above object, one aspect of the present invention provides the following belt meandering correction mechanism and image forming apparatus.

[１]ベルトの蛇行による押圧力を受けてロール揺動力に変換する力変換部を有するベースと、前記ベースに回転可能に配置され、前記ベルトを走行可能に掛け渡す複数のロールとを備え、前記複数のロールは、前記ベースの前記力変換部から前記ロール揺動力を受けて揺動し、かつロール復帰力を受けて復帰するベルト蛇行補正用のロールを含み、前記ベルト蛇行補正用のロールは、そのロール軸の少なくとも一方側の端部に前記ベルトの蛇行を補正するためのベルト蛇行補正部材が配置され、前記ベルト蛇行補正部材にロール端面に交差する方向に延びて前記ベルトのロール掛け渡し部側縁から前記ベルトの蛇行による押圧力を受ける第１面と、前記ベースの前記力変換部から前記ロール揺動力を受ける第２面とが設けられているベルト蛇行補正機構。 [1] A base having a force converting portion that receives a pressing force caused by meandering of the belt and converts it into a roll swinging force, and a plurality of rolls that are rotatably arranged on the base and over which the belt can run. The plurality of rolls include a belt meandering correction roll that swings in response to the roll swinging force from the force converting portion of the base and returns by receiving a roll return force, and the belt meandering correction roll A belt meandering correction member for correcting the meandering of the belt is disposed at at least one end of the roll shaft, and the belt meandering correction member extends in a direction crossing the end face of the roll so as to roll the belt. A belt snake provided with a first surface that receives a pressing force due to meandering of the belt from a side edge of the transfer portion and a second surface that receives the roll swinging force from the force conversion portion of the base. Correction mechanism.

[２]前記ベルト蛇行補正用のロールは、その軸線方向に移動不能に前記ベースに配置され、前記ベルト蛇行補正部材を前記ロール軸に相対回転不能かつ移動可能に保持する前記[１]に記載のベルト蛇行補正機構。 [2] The belt meandering correction roll is disposed on the base so as not to be movable in the axial direction thereof, and the belt meandering correction member is held on the roll shaft so as not to be relatively rotatable and movable. Belt meandering correction mechanism.

[３]前記ベルト蛇行補正用のロールは、前記ベルト蛇行補正部材が前記第１面を平面又は曲面とし、前記第２面を平面とする移動部材によって形成されている前記[１]に記載のベルト蛇行補正機構。 [3] The belt meandering correction roll according to [1], wherein the belt meandering correction member is formed by a moving member having the first surface as a plane or a curved surface and the second surface as a plane. Belt meander correction mechanism.

[４]前記ベルト蛇行補正用のロールは、前記ベルト蛇行補正部材が前記ロール軸に対して傾斜する軸線の回りに回転する回転部、及び前記回転部を回転可能に保持する保持部を有する移動部材によって形成され、前記回転部が平面からなる前記第１面を有し、前記保持部が円錐面からなる前記第２面を有する前記[１]に記載のベルト蛇行補正機構。 [4] The belt meandering correction roll includes a rotating part in which the belt meandering correction member rotates about an axis inclined with respect to the roll axis, and a holding part that rotatably holds the rotating part. The belt meandering correction mechanism according to [1], wherein the belt meandering correction mechanism is formed of a member, the rotating portion has the first surface formed of a flat surface, and the holding portion includes the second surface formed of a conical surface.

[５]前記ベルト蛇行補正用のロールは、前記ベルト蛇行補正部材が前記回転部を前記ベルト側に移動規制する移動規制部を有する前記[４]に記載のベルト蛇行補正機構。 [5] The belt meandering correction mechanism according to [4], wherein the belt meandering correction roll has a movement restricting portion that restricts movement of the belt meandering correction member toward the belt.

[６]前記ベルト蛇行補正用のロールは、前記ベルトに張力を付与するベルト張力付与手段によって前記ロール復帰力の一部が常時付与されている前記[１]に記載のベルト蛇行補正機構。 [6] The belt meandering correction mechanism according to [1], wherein a part of the roll restoring force is always applied to the belt meandering correction roll by belt tension applying means for applying tension to the belt.

[７]用紙に画像を形成する画像形成部と、前記画像形成部で形成されたトナー像が転写される中間転写ベルトと、前記中間転写ベルトの蛇行を補正するベルト蛇行補正機構とを備えた画像形成装置であって、前記ベルト蛇行補正機構は前記[１]乃至[６]のいずれか１つに記載のベルト蛇行補正機構である画像形成装置。 [7] An image forming unit that forms an image on a sheet, an intermediate transfer belt to which a toner image formed by the image forming unit is transferred, and a belt meandering correction mechanism that corrects the meandering of the intermediate transfer belt. The image forming apparatus, wherein the belt meandering correction mechanism is the belt meandering correction mechanism according to any one of [1] to [6].

請求項１乃至３に記載の発明によれば、ベルト蛇行補正部材がベルトの蛇行による第１押圧力をベルトのロール掛け渡し部側縁から第１面で受けてベルトの磨耗発生を抑制することができる。   According to the first to third aspects of the present invention, the belt meandering correction member receives the first pressing force due to the meandering of the belt from the side edge of the belt overhanging portion of the belt and suppresses the occurrence of belt wear. Can do.

請求項４，５に記載の発明によれば、ベルトの走行による押圧によってベルト蛇行補正部材の回転部が回転することが可能となり、ベルトのロール掛け渡し部側縁と回転部の第１面との間に発生する摩擦力によるベルトの磨耗発生を抑制することができる。   According to the fourth and fifth aspects of the present invention, it is possible to rotate the rotating portion of the belt meandering correction member by pressing due to the running of the belt, and the roll roll portion side edge of the belt and the first surface of the rotating portion Belt wear due to frictional force generated during

請求項６に記載の発明によれば、ベルト蛇行補正部材の揺動復帰手段として専用の復帰手段が不要になり、部品点数を削減することができる。   According to the sixth aspect of the present invention, no dedicated return means is required as the swing return means of the belt meandering correction member, and the number of parts can be reduced.

請求項７に記載に発明によれば、ベルト蛇行補正部材が中間転写ベルトの蛇行による第１押圧力を中間転写ベルトのロール掛け渡し部側縁から第１面で受けて中間転写ベルトの磨耗発生を抑制することができる。   According to the seventh aspect of the present invention, the belt meandering correction member receives the first pressing force due to the meandering of the intermediate transfer belt on the first surface from the roll transfer portion side edge of the intermediate transfer belt, and the intermediate transfer belt is worn. Can be suppressed.

図１は、本発明の第１の実施の形態に係るベルト蛇行補正機構が適用された画像形成装置を説明するために示す断面図である。FIG. 1 is a cross-sectional view for explaining an image forming apparatus to which a belt meandering correction mechanism according to a first embodiment of the present invention is applied. 図２は、本発明の第１の実施の形態に係るベルト蛇行補正機構を説明するために示す斜視図である。FIG. 2 is a perspective view for explaining the belt meandering correction mechanism according to the first embodiment of the present invention. 図３は、本発明の第１の実施の形態に係るベルト蛇行補正機構の要部を説明するために示す斜視図である。FIG. 3 is a perspective view for explaining a main part of the belt meandering correction mechanism according to the first embodiment of the present invention. 図４は、本発明の第１の実施の形態に係るベルト蛇行補正機構の要部を説明するために示す側面図である。FIG. 4 is a side view for explaining the main part of the belt meandering correction mechanism according to the first embodiment of the present invention. 図５は、本発明の第１の実施の形態に係るベルト蛇行補正機構におけるベルト蛇行補正部材のロール軸への配置状態を示す斜視図である。FIG. 5 is a perspective view showing an arrangement state of the belt meandering correction member on the roll shaft in the belt meandering correction mechanism according to the first embodiment of the present invention. 図６は、本発明の第１の実施の形態に係るベルト蛇行補正機構におけるベルト蛇行補正部材を説明するために示す斜視図である。FIG. 6 is a perspective view for explaining a belt meandering correction member in the belt meandering correction mechanism according to the first embodiment of the present invention. 図７は、本発明の第１の実施の形態に係るベルト蛇行補正機構におけるベルト蛇行補正部材のロール軸への配置状態に示す平面図である。FIG. 7 is a plan view showing an arrangement state of the belt meandering correction member on the roll shaft in the belt meandering correction mechanism according to the first embodiment of the present invention. 図８は、図７のＡ−Ａ断面図である。FIG. 8 is a cross-sectional view taken along the line AA of FIG. 図９（ａ），（ｂ）及び（ｃ）は、本発明の第１の実施の形態に係るベルト蛇行補正機構の動作を説明するために示す平面図と正面図である。図９（ａ）は通常のベルト走行状態を示す平面図を、図９（ｂ）は通常のベルト走行状態を示す正面図を、また図９（ｃ）はベルト蛇行状態を示す正面図をそれぞれ示す。FIGS. 9A, 9B and 9C are a plan view and a front view for explaining the operation of the belt meandering correction mechanism according to the first embodiment of the present invention. 9A is a plan view showing the normal belt running state, FIG. 9B is a front view showing the normal belt running state, and FIG. 9C is a front view showing the belt meandering state. Show. 図１０は、ベルト蛇行補正ロールにロール揺動力又はロール揺動復帰力が作用した場合におけるロール支持部の動作を説明するために模式化して示す側面図。FIG. 10 is a side view schematically showing the operation of the roll support portion when roll swinging force or roll swinging return force is applied to the belt meandering correction roll. 図１１（ａ）及び（ｂ）は、本発明の第１の実施の形態に係るベルト蛇行補正機構のベルト蛇行補正部材に対するベルト接触領域を従来例と比較するために簡略化して示す側面図である。図１１（ａ）は本発明のベルト接触領域を、図１１（ｂ）は従来例のベルト接触領域をそれぞれ示す。11 (a) and 11 (b) are side views showing the belt contact area with respect to the belt meandering correction member of the belt meandering correction mechanism according to the first embodiment of the present invention in a simplified manner for comparison with the conventional example. is there. 11A shows the belt contact area of the present invention, and FIG. 11B shows the belt contact area of the conventional example. 図１２は、本発明の第２の実施の形態に係るベルト蛇行補正機構におけるベルト蛇行補正部材のロール軸への配置状態を示す斜視図である。FIG. 12 is a perspective view showing an arrangement state of the belt meandering correction member on the roll shaft in the belt meandering correction mechanism according to the second embodiment of the present invention. 図１３は、本発明の第２の実施の形態に係るベルト蛇行補正機構におけるベルト蛇行補正部材のロール軸への配置状態を示す平面図である。FIG. 13 is a plan view showing an arrangement state of the belt meandering correction member on the roll shaft in the belt meandering correction mechanism according to the second embodiment of the present invention. 図１４は、図１３のＢ−Ｂ断面図である。14 is a cross-sectional view taken along the line BB in FIG. 図１５は、本発明の第２の実施の形態に係るベルト蛇行補正機構におけるベルト蛇行補正部材を説明するために示す分解斜視図である。FIG. 15 is an exploded perspective view for explaining a belt meandering correction member in the belt meandering correction mechanism according to the second embodiment of the present invention.

[第１の実施の形態]
先ず、本発明の第１の実施の形態に係る画像形成装置につき、図１を用いて説明する。
図１は、本発明の実施の形態に係る画像形成装置の概略を示す。この画像形成装置１０は、例えばデジタルカラープリンタであり、画像処理部（図示せず）を内蔵する筐体１１を有している。そして、パーソナルコンピュータ等の上位装置から送信された画像データに図示しない画像処理部で画像処理を施してイエロー（Ｙ），マゼンタ（Ｍ），シアン（Ｃ），ブラック（Ｋ）の各色の画像データに変換した後、各色の画像データに基づいてカラー画像を用紙に形成するように構成されている。 [First embodiment]
First, an image forming apparatus according to a first embodiment of the present invention will be described with reference to FIG.
FIG. 1 schematically shows an image forming apparatus according to an embodiment of the present invention. The image forming apparatus 10 is a digital color printer, for example, and includes a housing 11 that incorporates an image processing unit (not shown). Then, image data transmitted from a host device such as a personal computer is subjected to image processing by an image processing unit (not shown) and image data for each color of yellow (Y), magenta (M), cyan (C), and black (K). After the conversion to, a color image is formed on the paper based on the image data of each color.

筐体１０内の下部には、記録媒体としての用紙Ｐを収容する給紙トレイ１２が着脱可能に配置されている。筐体１０内の上部には、記録済みの用紙Ｐを排出するための用紙排出部１３が配置されている。また、筐体１１内には、給紙トレイ１２から用紙排出部１３に至る用紙搬送路１４が形成されている。用紙搬送路１４には、給紙トレイ１２から用紙Ｐを用紙搬送路１４に１枚ずつ取り込むピックアップロール１４ａ、用紙Ｐが重なって搬送されるのを防止しつつ１枚の用紙を搬送する搬送ロール対１４ｂ、及び用紙Ｐのスキューを補正する補正ロール対１４ｃ、用紙Ｐに二次転写されたトナー像を定着する定着ロール１４ｄ、及び定着ロール１４ｄでトナー像が定着された用紙Ｐを用紙排出部１３に排出する排出ロール１４ｅが配置されている。   A paper feed tray 12 that accommodates paper P as a recording medium is detachably disposed at a lower portion in the housing 10. A paper discharge unit 13 for discharging the recorded paper P is disposed in the upper part of the housing 10. In addition, a paper conveyance path 14 extending from the paper feed tray 12 to the paper discharge unit 13 is formed in the housing 11. A pickup roll 14 a that takes in the paper P from the paper feed tray 12 to the paper transport path 14 one by one in the paper transport path 14, and a transport roll that transports one sheet of paper while preventing the paper P from being overlapped and transported. A pair 14b, a correction roll pair 14c that corrects the skew of the paper P, a fixing roll 14d that fixes the toner image secondarily transferred to the paper P, and a paper P on which the toner image is fixed by the fixing roll 14d. A discharge roll 14e for discharging to 13 is disposed.

筐体１１内の中央部には、用紙Ｐに画像を形成する画像形成部２０が配置されている。画像形成部２０の近傍には、駆動ロール３０，ベルト蛇行補正ロール３１及び従動ロール３２が配置されている。これらロール３０〜３２には、図中の矢印方向に循環移動（走行）する無端状の中間転写ベルト３３が掛け渡されている。中間転写ベルト３３の外側には、図中の矢印方向に回転しながらＹ，Ｍ，Ｃ，Ｋの各色用のトナー画像を形成するための被回転体としての感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋを有する画像形成ユニット２１Ｙ，２１Ｍ，２１Ｃ，２１Ｋがベルト走行方向に一定の間隔をもって着脱可能に配置されている。中間転写ベルト３３の内側には、感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋの表面に形成されたトナー画像を中間転写ベルト３３に転写する一次転写ロール２６Ｙ，２６Ｍ，２６Ｃ，２６Ｋが回転可能に配置されている。ベルト蛇行補正ロール３１は、駆動ロール３０及び従動ロール３２と共に中間転写ベルト３３の蛇行を補正するベルト蛇行補正機構を構成する。ベルト蛇行補正機構の詳細については後述する。   An image forming unit 20 that forms an image on the paper P is disposed in the center of the housing 11. In the vicinity of the image forming unit 20, a drive roll 30, a belt meandering correction roll 31, and a driven roll 32 are arranged. An endless intermediate transfer belt 33 that circulates (runs) in the direction of the arrow in the drawing is stretched around these rolls 30 to 32. Photoconductors 22Y, 22M, 22C, and 22K as rotated bodies for forming toner images for the respective colors Y, M, C, and K while rotating in the direction of the arrows in the drawing are provided outside the intermediate transfer belt 33. The image forming units 21Y, 21M, 21C, and 21K having the above are detachably arranged at a certain interval in the belt traveling direction. Inside the intermediate transfer belt 33, primary transfer rolls 26Y, 26M, 26C, and 26K that transfer the toner images formed on the surfaces of the photoreceptors 22Y, 22M, 22C, and 22K to the intermediate transfer belt 33 are rotatably disposed. ing. The belt meandering correction roll 31 constitutes a belt meandering correction mechanism for correcting the meandering of the intermediate transfer belt 33 together with the driving roll 30 and the driven roll 32. Details of the belt meandering correction mechanism will be described later.

画像形成ユニット２１Ｙ，２１Ｍ，２１Ｃ，２１Ｋは、それぞれ同様に構成され、前述した感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋと、感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋの表面を一様に帯電する帯電器２３と、感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋの表面に露光器２７によって形成された静電潜像をトナーで現像することにより感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋの表面にトナー画像を形成する現像器２４と、感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋの表面に残留しているトナーを回収する感光体クリーニング部２５とを備える。   The image forming units 21Y, 21M, 21C, and 21K are configured in the same manner, and the above-described photoreceptors 22Y, 22M, 22C, and 22K and chargers that uniformly charge the surfaces of the photoreceptors 22Y, 22M, 22C, and 22K. 23, and developing the electrostatic latent image formed by the exposure device 27 on the surface of the photoconductors 22Y, 22M, 22C, and 22K with toner, thereby forming toner images on the surfaces of the photoconductors 22Y, 22M, 22C, and 22K. A developing unit 24 and a photoconductor cleaning unit 25 that collects toner remaining on the surfaces of the photoconductors 22Y, 22M, 22C, and 22K are provided.

現像器２４は、トナーを内部に収容するハウジング２４ａを有する。ハウジング２４ａ内には、感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋにトナーを供給して感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋ上の静電潜像をトナーで現像する現像ロール２４ｂと、現像ロール２４ｂにトナーを供給する供給オーガー２４ｃと、トナーを攪拌するとともに供給オーガー２４ｃにトナーを供給する攪拌オーガー２４ｄとが配置されている。そして現像器２４は、トナーボックス３５Ｙ，３５Ｍ，３５Ｃ，３５Ｋから各色のトナーの供給を受けるように構成されている。   The developing device 24 includes a housing 24a that stores toner therein. In the housing 24a, toner is supplied to the photoconductors 22Y, 22M, 22C, and 22K, and the electrostatic latent images on the photoconductors 22Y, 22M, 22C, and 22K are developed with toner, and the development roll 24b A supply auger 24c for supplying toner and a stirring auger 24d for stirring toner and supplying toner to the supply auger 24c are arranged. The developing device 24 is configured to receive toner of each color from the toner boxes 35Y, 35M, 35C, and 35K.

露光器２７は、Ｙ，Ｍ，Ｃ，Ｋ各色の画像データで変調されたレーザ光を出射する図示しない４つの半導体レーザと、各半導体レーザから出射されたレーザ光を分岐するポリゴンミラー２７ａと、ポリゴンミラー２７ａによって分岐されたレーザ光を反射して感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋに照射して感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋの表面に静電潜像を形成する複数のミラー２７ｂとを備え、トナー等で汚れないようにフレーム２７ｃによって密閉されている。フレーム２７ｃの上部は例えば透明ガラスによって形成されている。   The exposure unit 27 includes four semiconductor lasers (not shown) that emit laser light modulated with image data of each color of Y, M, C, and K, a polygon mirror 27a that branches the laser light emitted from each semiconductor laser, A plurality of mirrors 27b that reflect the laser beam branched by the polygon mirror 27a and irradiate the photoreceptors 22Y, 22M, 22C, and 22K to form electrostatic latent images on the surfaces of the photoreceptors 22Y, 22M, 22C, and 22K; And is sealed by a frame 27c so as not to get dirty with toner or the like. The upper part of the frame 27c is made of, for example, transparent glass.

画像形成部２０は、駆動ロール３０に中間転写ベルト３３を介して対向する二次転写ロール３４を有し、駆動ロール３０と形成するニップ領域において中間転写ベルト３３上のトナー画像を用紙Ｐに二次転写する。   The image forming unit 20 includes a secondary transfer roll 34 facing the drive roll 30 via the intermediate transfer belt 33, and the toner image on the intermediate transfer belt 33 is transferred onto the paper P in the nip region formed with the drive roll 30. Next transfer.

また、画像形成部２０は、画像形成ユニット２１Ｙの上流側であって、ベルト蛇行補正ロール３１に中間転写ベルト３３を介して対向するベルトクリーニング部４０を有する。ベルトクリーニング部４０は、ベルト蛇行補正ロール３１側へ押圧され、中間転写ベルト３３上に残留しているトナーを掻き取って回収する。   The image forming unit 20 includes a belt cleaning unit 40 that is upstream of the image forming unit 21 </ b> Y and faces the belt meandering correction roll 31 with the intermediate transfer belt 33 interposed therebetween. The belt cleaning unit 40 is pressed toward the belt meandering correction roll 31 and scrapes off and collects the toner remaining on the intermediate transfer belt 33.

次に、本発明の第１の実施の形態に係るベルト蛇行補正機構につき、図２〜図８を用いて説明する。図２はベルト蛇行補正機構の全体を示す。図２に示すように、ベルト蛇行補正機構１００は、その機構本体としてのベース５０、ベルト蛇行補正ロール３１（後述）を両端部で支持するロール支持部５１，５１、及びベルト蛇行補正ロール３１を含むロール３０〜３２（図１に示す）を備え、画像形成装置１０（図１に示す）の筐体１１内に配置されている。   Next, the belt meandering correction mechanism according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows the entire belt meandering correction mechanism. As shown in FIG. 2, the belt meandering correction mechanism 100 includes a base 50 as a mechanism main body, roll support portions 51 and 51 that support a belt meandering correction roll 31 (described later) at both ends, and a belt meandering correction roll 31. Rolls 30 to 32 (shown in FIG. 1) are provided, and are arranged in the casing 11 of the image forming apparatus 10 (shown in FIG. 1).

ベース５０は、互いに対向する１対の側壁部５０ａ，５０ａ、及びこれら１対の側壁部５０ａ，５０ａを連結する複数の連結部（図示せず）を有し、全体がロール支持部５１を介してロール３０〜３２を回転可能に支持する略角形枠状の支持部材として形成されている。側壁部５０ａ，５０ａには、ベース５０内で互いに対向する力変換部材５２，５２（一方のみ図示）が取り付けられている。また、側壁部５０ａ，５０ａには、中間転写ベルト３３に張力を付与するベルト張力付与手段としての引張スプリング５３を係止するスプリング係止具５１ａ，５１ａが配置されている。   The base 50 has a pair of side wall portions 50a, 50a facing each other and a plurality of connecting portions (not shown) for connecting the pair of side wall portions 50a, 50a, and the whole is provided via a roll support portion 51. Thus, it is formed as a substantially square frame-shaped support member that rotatably supports the rolls 30 to 32. Force conversion members 52 and 52 (only one of them is shown) that are opposed to each other in the base 50 are attached to the side walls 50a and 50a. Further, spring locking tools 51a and 51a for locking a tension spring 53 as belt tension applying means for applying tension to the intermediate transfer belt 33 are arranged on the side walls 50a and 50a.

図３は、ベルト蛇行補正機構の要部を斜め後方から見た状態を示す。図３に示すように、力変換部材５２は、断面半円状の接触部５２ａを先端部に有し、中間転写ベルト３３の側方に配置されている。そして、中間転写ベルト３３の蛇行による第１押圧力ａを受けてその一部をロール揺動力ｂに変換するとともに、復帰手段としての引張スプリング５３の引張力によるロール揺動復帰力ｃ（図４に示す）を受けてその一部（ロール揺動復帰力ｃによる第２押圧力ｄの一部）を中間転写ベルト３３の蛇行を補正する補正力ｅに変換するように構成されている。力変換部材５２の材料としては、例えばフッ素樹脂，ポリエチレンテレフタレート（ＰＥＴ）樹脂などの樹脂材料、あるいはアルミニウム（Ａｌ），ステンレスなどの金属材料が用いられる。   FIG. 3 shows a state in which the main part of the belt meandering correction mechanism is viewed obliquely from the rear. As shown in FIG. 3, the force conversion member 52 has a contact portion 52 a having a semicircular cross section at the tip, and is disposed on the side of the intermediate transfer belt 33. Then, the first pressing force a due to the meandering of the intermediate transfer belt 33 is received and a part thereof is converted into the roll swinging force b, and the roll swinging return force c due to the pulling force of the tension spring 53 as a return means (FIG. 4). And a part thereof (a part of the second pressing force d by the roll swinging return force c) is converted into a correction force e for correcting the meandering of the intermediate transfer belt 33. As the material of the force conversion member 52, for example, a resin material such as fluororesin or polyethylene terephthalate (PET) resin, or a metal material such as aluminum (Al) or stainless steel is used.

図４は、ベルト蛇行補正機構の要部を側方から見た状態を示す。図４に示すように、ロール支持部５１（一方のみ図示）は、連結ピン５４を介して互いに揺動可能に連結する１対のリンク５５，５６を有するリンク機構からなり、力変換部材５２の外側に配置されている。   FIG. 4 shows a state in which the main part of the belt meandering correction mechanism is viewed from the side. As shown in FIG. 4, the roll support portion 51 (only one is shown) includes a link mechanism having a pair of links 55 and 56 that are slidably connected to each other via a connection pin 54. Arranged outside.

一方のリンク５５は、ベース５０の側壁部５０ａに揺動回転ピン５７を中心に揺動可能に保持されている。そして、揺動回転ピン５７を中心として矢印ｍ，ｎ方向に揺動するように構成されている。リンク５５には、スプリング係止具５１ａに係止される引張スプリング５３の他端が係止されるスプリング係止部５５ａが設けられている。   One link 55 is held on the side wall portion 50 a of the base 50 so as to be swingable around the swing rotation pin 57. And it is comprised so that it may rock | fluctuate in the arrow m and n direction centering | focusing on the rocking | swiveling rotation pin 57. FIG. The link 55 is provided with a spring locking portion 55a in which the other end of the tension spring 53 locked in the spring locking tool 51a is locked.

他方のリンク５６は、ベルト蛇行補正ロール３１（ロール軸３１ａ）を介して作用する中間転写ベルト３３の張力と一方のリンク５５に作用する引張スプリング５３の引張力とが釣り合う位置に、例えば連結ピン５４と揺動回転ピン５７とを結ぶ軸線Ｏ１に略直交する軸線Ｏ２上に配置されている。リンク５６の自由端部（連結ピン５４側の端部と反対側の端部）には、ベルト蛇行補正ロール３１のロール軸３１ａをその軸線Ｏ３方向に移動不能に支持する支持孔５６ａ（図３に示す）が設けられている。 The other link 56 is, for example, a connecting pin at a position where the tension of the intermediate transfer belt 33 acting via the belt meandering correction roll 31 (roll shaft 31a) and the tensile force of the tension spring 53 acting on one link 55 are balanced. 54 is disposed on an axis O 2 that is substantially orthogonal to the axis O 1 that connects the pin 54 and the rocking rotation pin 57. The free end of the link 56 (end opposite to the end of the connection pin 54 side), the support hole 56a (Fig for immovably supporting the roll shaft 31a of the belt meandering correction roller 31 in the axial O 3 directions 3) is provided.

ロール３０〜３２（図１に示す）は、ベース５０の側壁部５０ａ，５０ａ（図２に示す）に駆動ロール３０及び従動ロール３２のロール軸（図示せず）の端部が、またベルト蛇行補正ロール３１のロール軸３１ａの端部がロール支持部５１を介してそれぞれ回転可能に支持されている。   The rolls 30 to 32 (shown in FIG. 1) have side walls 50a and 50a (shown in FIG. 2) of the base 50, and end portions of the roll shafts (not shown) of the drive roll 30 and the driven roll 32. The end portion of the roll shaft 31 a of the correction roll 31 is rotatably supported via the roll support portion 51.

図５は、ベルト蛇行補正ロールへの中間転写ベルトの接触状態を斜め上方から見た状態を示す。図５に示すように、ベルト蛇行補正ロール３１は、その軸線上にロール軸３１ａを有し、ベース５０（図２に示す）の側壁部５０ａ，５０ａにロール支持部５１を介して回転可能かつ移動不能に配置され、引張スプリング５３（図４に示す）によって引張力（ロール揺動復帰力ｃ）が常時付与されている。   FIG. 5 shows the contact state of the intermediate transfer belt to the belt meandering correction roll as viewed obliquely from above. As shown in FIG. 5, the belt meandering correction roll 31 has a roll shaft 31 a on its axis, and is rotatable on side walls 50 a and 50 a of a base 50 (shown in FIG. 2) via a roll support 51. It is arranged so as not to move, and a tensile force (roll swing return force c) is constantly applied by a tension spring 53 (shown in FIG. 4).

そして、ベルト蛇行補正ロール３１は、ベルト蛇行補正部材５８，５８（一方のみ図示）を介して中間転写ベルト３３の蛇行による第１押圧力ａを受けた力変換部材５２からロール揺動力ｂを受け、引張スプリング５３（図４に示す）の引張力に抗して揺動するように構成されている。   The belt meandering correction roll 31 receives the roll swinging force b from the force converting member 52 that has received the first pressing force a due to the meandering of the intermediate transfer belt 33 via the belt meandering correction members 58 and 58 (only one is shown). The spring is configured to swing against the tensile force of the tension spring 53 (shown in FIG. 4).

また、ベルト蛇行補正ロール３１は、中間転写ベルト３３からベルト走行力をロール揺動復帰力として受けるとともに、引張スプリング５３の引張力によるロール揺動復帰力ｃをロール支持部５１から受けて揺動復帰するように構成されている。これにより、ベルト蛇行補正ロール３１の揺動復帰手段として中間転写ベルト３３のベルト張力付与手段（引張スプリング５３）を用いることができ、専用の揺動復帰手段が不要になり、部品点数を削減することができる。   The belt meandering correction roll 31 receives the belt running force from the intermediate transfer belt 33 as a roll swing return force, and also receives the roll swing return force c due to the tensile force of the tension spring 53 from the roll support portion 51 and swings. It is configured to return. As a result, the belt tension applying means (tensile spring 53) of the intermediate transfer belt 33 can be used as the swing return means of the belt meandering correction roll 31, and no dedicated swing return means is required, reducing the number of parts. be able to.

図６はベルト蛇行補正部材を示す。図６に示すように、ベルト蛇行補正部材５８，５８（一方のみ図示）は、ベルト蛇行補正ロール３１（図５に示す）のロール軸３１ａの各端部に相対回転不能かつ移動可能に保持され、全体が各表面積を互いに異にする第１面５８ａ〜第７面５８ｇを有する七面体によって形成されている。そして、中間転写ベルト３３の蛇行による第１押圧力ａを受けて中間転写ベルト３３（図５に示す）から離間する方向にベルト蛇行補正ロール３１のロール軸３１ａ上を移動するとともに、第１押圧力ａの一部を力変換部材５２（図５に示す）に作用させるように構成されている。ベルト蛇行補正部材５８，５８としては、例えばフッ素樹脂，ポリエチレンテレフタレート（ＰＥＴ）樹脂などの樹脂材料、あるいはアルミニウム（Ａｌ），ステンレスなどの金属材料が用いられる。両ベルト蛇行補正部材５８，５８間の寸法は、中間転写ベルト３３の幅方向寸法よりも大きい寸法に設定されている。第１面５８ａ及び第２面５８ｂについては後述する。   FIG. 6 shows a belt meandering correction member. As shown in FIG. 6, the belt meandering correction members 58 and 58 (only one is shown) are held at each end of the roll shaft 31a of the belt meandering correction roll 31 (shown in FIG. 5) so as not to be relatively rotatable and movable. The whole is formed of a heptahedron having a first surface 58a to a seventh surface 58g having different surface areas. In response to the first pressing force a caused by the meandering of the intermediate transfer belt 33, the belt moves on the roll shaft 31a of the belt meandering correction roll 31 in the direction away from the intermediate transfer belt 33 (shown in FIG. 5), and the first pressing force a. A part of the pressure a is configured to act on the force conversion member 52 (shown in FIG. 5). As the belt meandering correction members 58 and 58, for example, a resin material such as fluororesin and polyethylene terephthalate (PET) resin, or a metal material such as aluminum (Al) or stainless steel is used. The dimension between the belt meandering correction members 58 and 58 is set to be larger than the dimension in the width direction of the intermediate transfer belt 33. The first surface 58a and the second surface 58b will be described later.

ベルト蛇行補正部材５８には、第１面５８ａ及び第５面５８ｅに開口し、かつベルト蛇行補正ロール３１（図５に示す）のロール軸３１ａを挿通させるシャフト挿通孔５８ｈが設けられている。   The belt meandering correction member 58 is provided with a shaft insertion hole 58h that opens to the first surface 58a and the fifth surface 58e and through which the roll shaft 31a of the belt meandering correction roll 31 (shown in FIG. 5) is inserted.

また、ベルト蛇行補正部材５８は、引張スプリング５３（図４に示す）のロール揺動復帰力ｃを受けて中間転写ベルト３３に接近する方向にベルト蛇行補正ロール３１のロール軸３１ａ上を移動するとともに、ロール揺動復帰力ｃの一部（第２押圧力ｄ）を力変換部材５２（図５に示す）に作用させるように構成されている。   Further, the belt meandering correction member 58 receives the roll swing return force c of the tension spring 53 (shown in FIG. 4) and moves on the roll shaft 31a of the belt meandering correction roll 31 in the direction approaching the intermediate transfer belt 33. At the same time, a part (second pressing force d) of the roll swing return force c is applied to the force conversion member 52 (shown in FIG. 5).

図７は、ベルト蛇行補正ロールへの中間転写ベルトの接触状態を上方から見た状態を示す。図８は、ベルト蛇行補正ロールへの中間転写ベルトの接触状態をベルト上流側から見た状態を示す。図７及び図８に示すように、第１面５８ａは、中間転写ベルト３３の蛇行によってそのロール掛け渡し部側縁３３ａを接触可能な位置に配置され、全体がシャフト挿通孔５８ｈ（ロール軸３１ａ）の軸線Ｏ３に対し傾斜する(例えば、第１面５８ａの傾斜角度αが軸線Ｏ３に直交する面に対しα≒１０°傾斜する)矩形状の平面で形成されている。これにより、ベルト蛇行補正部材５８が中間転写ベルト３３の蛇行による第１押圧力ａを中間転写ベルト３３のロール掛け渡し部側縁３３ａから第１面５８ａで受けて中間転写ベルト３３の磨耗発生を抑制することができる。第１面５８ａは、中間転写ベルト３３のロール掛け渡し部側縁３３ａとの間で第１押圧力ａの他、補正力ｅを授受するように構成されている。 FIG. 7 shows a state in which the intermediate transfer belt contacts the belt meandering correction roll as viewed from above. FIG. 8 shows a state in which the intermediate transfer belt is in contact with the belt meandering correction roll as seen from the upstream side of the belt. As shown in FIGS. 7 and 8, the first surface 58a is disposed at a position where the roll transfer portion side edge 33a can come into contact with the meandering of the intermediate transfer belt 33, and the first surface 58a is entirely inserted into the shaft insertion hole 58h (roll shaft 31a). (e.g. inclined with respect to the axis O 3 of) the inclination angle α of the first surface 58a is ≒ 10 ° inclined α with respect to a plane perpendicular to the axis O 3) is formed by rectangular planar. As a result, the belt meandering correction member 58 receives the first pressing force a due to the meandering of the intermediate transfer belt 33 from the roll transfer portion side edge 33a of the intermediate transfer belt 33 on the first surface 58a, and the intermediate transfer belt 33 is worn. Can be suppressed. The first surface 58a is configured to transmit and receive a correction force e in addition to the first pressing force a between the intermediate transfer belt 33 and the roll transfer portion side edge 33a.

なお、本実施の形態では、第１面５８ａの傾斜角度αが軸線Ｏ３に直交する面に対しα≒１０°傾斜する角度に設定されている場合について説明したが、第１面の傾斜角度を他の角度に設定してもよい。また、第１面５８ａが平面で形成されている場合について説明したが、平面に替えて曲面で第１面を形成してもよい。 In the present embodiment has described the case where the inclination angle alpha of the first surface 58a is set to an angle inclined alpha ≒ 10 ° with respect to a plane perpendicular to the axis O 3, the inclination angle of the first surface May be set to other angles. Moreover, although the case where the 1st surface 58a was formed in the plane was demonstrated, it may replace with a plane and may form the 1st surface with a curved surface.

第２面５８ｂは、力変換部材５２の接触部５２ａを押圧する位置に配置され、全体がシャフト挿通孔５８ｈの軸線Ｏ３及び第１面５８ａに対し傾斜する（例えば、第２面５８ｂの傾斜角度βが軸線Ｏ３に直交する面に対しβ≒４５°傾斜する）矩形状の平面で形成されている。そして、力変換部材５２の接触部５２ａとの間でロール揺動力ｂ及び第２押圧力ｄを授受するように構成されている。 The second surface 58b is disposed at a position for pressing the contact portion 52a of the force converting member 52, the whole is inclined with respect to the axis O 3 and first surface 58a of the shaft insertion hole 58h (e.g., slope of the second surface 58b (An angle β is inclined by β≈45 ° with respect to a plane orthogonal to the axis O 3 ). And it is comprised so that the roll rocking | fluctuation force b and the 2nd pressing force d may be exchanged between the contact parts 52a of the force conversion member 52. FIG.

なお、本実施の形態では、第２面５８ｂの傾斜角度βが軸線Ｏ３に直交する面に対しβ≒４５°傾斜する角度に設定されている場合について説明したが、第２面の傾斜角度を他の角度に設定してもよい。 In the present embodiment has described the case where the inclination angle beta of the second surface 58b is set to an angle of inclination beta ≒ 45 ° with respect to a plane perpendicular to the axis O 3, the inclination angle of the second surface May be set to other angles.

次に、本発明の第１の実施の形態に係るベルト蛇行補正機構の動作につき、図９（ａ）〜（ｃ）及び図１０を用いて説明する。図９（ａ）及び（ｂ）は中間転写ベルトの通常の走行状態を、また図９（ｃ）は中間転写ベルトが蛇行した場合の走行状態をそれぞれ示す。図１０は、ベルト蛇行補正ロールにロール揺動力又はロール揺動復帰力が作用した場合におけるロール支持部の動作状態を示す。   Next, the operation of the belt meandering correction mechanism according to the first embodiment of the present invention will be described with reference to FIGS. 9 (a) to 9 (c) and FIG. 9A and 9B show a normal running state of the intermediate transfer belt, and FIG. 9C shows a running state when the intermediate transfer belt meanders. FIG. 10 shows an operation state of the roll support portion when a roll swinging force or a roll swinging return force is applied to the belt meandering correction roll.

図９（ａ）及び（ｂ）に示すように中間転写ベルト３３が通常に走行する状態から、図９（ｃ）に示すように中間転写ベルト３３に蛇行が生じ、中間転写ベルト３３のロール掛け渡し部側縁３３ａが一方のベルト蛇行補正部材５８の第１面５８ａを第１押圧力ａで押圧すると、ベルト蛇行補正部材５８が第１面５８ａで中間転写ベルト３３のロール掛け渡し部側縁３３ａから第１押圧力ａを受ける。この場合、ベルト蛇行補正部材５８が第１面５８ａで第１押圧力ａを受けると、中間転写ベルト３３から離間する方向にベルト蛇行補正ロール３１のロール軸３１ａに沿って移動するとともに、第１押圧力ａの一部がベルト蛇行補正部材５８の第２面５８ｂから力変換部材５２に接触部５２ａを介して作用する。   As shown in FIGS. 9A and 9B, the intermediate transfer belt 33 snakes from the normal running state as shown in FIG. 9C, and the intermediate transfer belt 33 is rolled. When the transfer portion side edge 33a presses the first surface 58a of the one belt meandering correction member 58 with the first pressing force a, the belt meandering correction member 58 is the first surface 58a on the roll passing portion side edge of the intermediate transfer belt 33. A first pressing force a is received from 33a. In this case, when the belt meandering correction member 58 receives the first pressing force a on the first surface 58a, the belt meandering correction member 58 moves along the roll axis 31a of the belt meandering correction roll 31 in the direction away from the intermediate transfer belt 33, and the first surface 58a. A part of the pressing force a acts on the force conversion member 52 from the second surface 58b of the belt meandering correction member 58 via the contact portion 52a.

力変換部材５２では、接触部５２ａが第１押圧力ａの一部をベルト蛇行補正部材５８の第２面５８ｂから受けてロール揺動力ｂに変換する。この場合、力変換部材５２で第１押圧力ａの一部がロール揺動力ｂに変換されると、このロール揺動力ｂがベルト蛇行補正ロール３１のロール軸３１ａにベルト蛇行補正部材５８を介して伝達される。   In the force conversion member 52, the contact portion 52a receives a part of the first pressing force a from the second surface 58b of the belt meandering correction member 58 and converts it into a roll swinging force b. In this case, when a part of the first pressing force a is converted into the roll swinging force b by the force conversion member 52, the roll swinging force b is applied to the roll shaft 31 a of the belt meandering correction roll 31 via the belt meandering correction member 58. Is transmitted.

このため、ベルト蛇行補正ロール３１のロール軸３１ａが図１０に矢印ｓで示す方向に変位し、リンク５５，５６の揺動面及び中間転写ベルト３３のロール間走行面に略直交する面内においてベルト蛇行補正ロール３１が引張スプリング５３の引張力に抗して揺動する。   Therefore, the roll shaft 31a of the belt meandering correction roll 31 is displaced in the direction indicated by the arrow s in FIG. The belt meandering correction roll 31 swings against the tensile force of the tension spring 53.

これに伴い、ロール支持部５１のリンク５６が図１０に実線で示す位置から図１０に２点鎖線で示すように連結ピン５４を変位させて揺動し、このリンク５６の揺動動作に連動してリンク５５が図１０に実線で示す位置から図１０に２点鎖線で示すように揺動回転ピン５７を中心にして揺動する。   Accordingly, the link 56 of the roll support portion 51 swings from the position shown by the solid line in FIG. 10 by displacing the connecting pin 54 as shown by the two-dot chain line in FIG. Then, the link 55 swings from the position indicated by the solid line in FIG. 10 around the swing rotation pin 57 as indicated by the two-dot chain line in FIG.

一方、中間転写ベルト３３の蛇行によるベルト蛇行補正部材５８への第１押圧力ａが解除されると、引張スプリング５３の引張力がロール支持部５１のリンク５５に作用するため、この引張力を受けてリンク５５が図１０に２点鎖線で示す位置から図１０に実線で示すように揺動回転ピン５７を中心にして揺動復帰し、このリンク５５の揺動復帰動作に連動してリンク５６が図１０に２点鎖線で示す位置から図１０に実線で示すように揺動復帰する。   On the other hand, when the first pressing force a applied to the belt meandering correction member 58 due to the meandering of the intermediate transfer belt 33 is released, the tensile force of the tension spring 53 acts on the link 55 of the roll support portion 51. Then, the link 55 swings and returns from the position shown by the two-dot chain line in FIG. 10 around the swinging rotation pin 57 as shown by the solid line in FIG. 56 swings back from the position indicated by the two-dot chain line in FIG. 10 as indicated by the solid line in FIG.

これに伴い、ベルト蛇行補正ロール３１のロール軸３１ａが図１０に矢印ｔで示す方向に変位し、リンク５５，５６の揺動面及び中間転写ベルト３３のロール間走行面に略直交する面内においてベルト蛇行補正ロール３１が引張スプリング５３の引張力によるロール揺動復帰力ｃによって揺動復帰する。   Accordingly, the roll shaft 31a of the belt meandering correction roll 31 is displaced in the direction indicated by the arrow t in FIG. 10, and the in-plane substantially orthogonal to the swing surfaces of the links 55 and 56 and the inter-roll running surface of the intermediate transfer belt 33. Then, the belt meandering correction roll 31 is returned to the swinging state by the roll swinging return force c due to the tensile force of the tension spring 53.

このため、ベルト蛇行補正部材５８が中間転写ベルト３３に接近する方向にベルト蛇行補正ロール３１のロール軸３１ａに沿って移動するとともに、ロール揺動復帰力ｃによる第２押圧力ｄ（図８に示す）がベルト蛇行補正ロール３１の第２面５８ｂから力変換部材５２に接触部５２ａを介して作用する。   Therefore, the belt meandering correction member 58 moves along the roll shaft 31a of the belt meandering correction roll 31 in the direction approaching the intermediate transfer belt 33, and the second pressing force d (see FIG. 8) due to the roll swing return force c. 2) acts on the force conversion member 52 from the second surface 58b of the belt meandering correction roll 31 via the contact portion 52a.

力変換部材５２では、接触部５２ａが第２押圧力ｄをベルト蛇行補正部材５８の第２面５８ｂから受けて中間転写ベルト３３の蛇行を補正する補正力ｅに変換する。   In the force conversion member 52, the contact portion 52 a receives the second pressing force d from the second surface 58 b of the belt meandering correction member 58 and converts it into a correction force e that corrects the meandering of the intermediate transfer belt 33.

また、図９（ｃ）に示すように、ベルト蛇行補正ロール３１が力変換部材５２の接触面５２ａからロール揺動力ｂを受けて揺動し、駆動ロール３０に対して傾斜している状態において、ベルト蛇行補正ロール３１には引張スプリング５３の引張力によるロール揺動復帰力ｃの他に、駆動ロール３０の回転による中間転写ベルト３３のベルト走行力がロール揺動復帰力として作用する。このため、ベルト蛇行補正ロール３１がロール揺動復帰力ｃ及びベルト走行力を受けて揺動復帰する際、中間転写ベルト３３が蛇行位置からロール幅方向中央位置に向かう方向にベルト走行力（駆動ロール３０に向かう力）の一部を受ける。   9C, the belt meandering correction roll 31 receives the roll swinging force b from the contact surface 52a of the force conversion member 52, and swings and tilts with respect to the drive roll 30. In addition to the roll rocking return force c due to the tensile force of the tension spring 53, the belt running force of the intermediate transfer belt 33 due to the rotation of the drive roll 30 acts on the belt meandering correction roll 31 as the roll rocking return force. For this reason, when the belt meandering correction roll 31 receives the roll swing return force c and the belt travel force and returns to swing, the intermediate transfer belt 33 moves in the direction from the meandering position toward the center in the roll width direction. Part of the force toward the roll 30 is received.

これにより、中間転写ベルト３３のベルト蛇行補正ロール３１に対する掛け渡し部が蛇行位置からロール幅方向中央位置に変位し、中間転写ベルト３３の蛇行が自動的に補正される。   As a result, the span of the intermediate transfer belt 33 with respect to the belt meandering correction roll 31 is displaced from the meandering position to the center position in the roll width direction, and the meandering of the intermediate transfer belt 33 is automatically corrected.

図１１（ａ）及び（ｂ）は、ベルト蛇行補正部材に対するベルト接触領域における本発明と従来例との比較を示す。   FIGS. 11A and 11B show a comparison between the present invention and the conventional example in the belt contact region with respect to the belt meandering correction member.

本実施の形態においては、図１１（ａ）に示すように、中間転写ベルト３３の蛇行による第１押圧力ａがベルト蛇行補正部材５８の第１面５８ａに中間転写ベルト３３のロール掛け渡し部側縁３３ａを介して作用するため、中間転写ベルト３３のベルト蛇行補正部材５８に対するベルト幅方向抗力が大きくなる。これにより、中間転写ベルト３３が蛇行によってベルト蛇行補正部材５８を押圧しても、掛け渡し部側縁３３ａでの磨耗が発生し難くなり、中間転写ベルト３３の破断が抑制される。   In the present embodiment, as shown in FIG. 11A, the first pressing force a due to meandering of the intermediate transfer belt 33 is applied to the first surface 58a of the belt meandering correction member 58 by the roll transfer portion of the intermediate transfer belt 33. Since it acts via the side edge 33a, the belt width direction drag against the belt meandering correction member 58 of the intermediate transfer belt 33 is increased. As a result, even if the intermediate transfer belt 33 presses the belt meandering correction member 58 by meandering, it is difficult for wear to occur at the bridging portion side edge 33a, and breakage of the intermediate transfer belt 33 is suppressed.

これに対して、従来のベルト蛇行補正機構によると、図１１（ｂ）に示すように、中間転写ベルト６０の蛇行による押圧力が中間転写ベルト６０のロール掛け渡し部側縁６０ａのみならず、このロール掛け渡し部側縁６０ａに連続するベルト平面部側縁６０ｂ，６０ｂを介してベルト蛇行補正部材６１（図１１（ｂ）では例えば円錐状部材の扁平な底面）に作用するため、中間転写ベルト６０のベルト蛇行補正部材６１に対するベルト幅方向抗力が小さい。これにより、中間転写ベルト６０が蛇行によってベルト蛇行補正部材６１を押圧すると、ベルト平面部側縁６０ｂ，６０ｂに磨耗が発生し、この磨耗の繰り返しによって中間転写ベルト６０が破断し易くなる。   On the other hand, according to the conventional belt meandering correction mechanism, as shown in FIG. 11B, the pressing force due to the meandering of the intermediate transfer belt 60 is not limited to the roll transfer portion side edge 60a of the intermediate transfer belt 60. The belt meandering correction member 61 (for example, the flat bottom surface of the conical member in FIG. 11B) acts on the belt meandering side edge 60b, 60b continuous with the roll spanning part side edge 60a. The belt width direction drag of the belt 60 against the belt meandering correction member 61 is small. Accordingly, when the intermediate transfer belt 60 presses the belt meandering correction member 61 by meandering, wear occurs on the belt flat portion side edges 60b and 60b, and the intermediate transfer belt 60 is easily broken by repetition of this wear.

[第２の実施の形態]
次に、本発明の第２の実施の形態に係るベルト蛇行補正機構につき、図１２〜図１５を用いて説明する。図１２〜図１５において、図５と同一又は同等の部材については同一の符号を付し、詳細な説明は省略する。 [Second Embodiment]
Next, a belt meandering correction mechanism according to a second embodiment of the present invention will be described with reference to FIGS. 12 to 15, members that are the same as or equivalent to those in FIG. 5 are given the same reference numerals, and detailed descriptions thereof are omitted.

図１２は、ベルト蛇行補正ロールへの中間転写ベルトの接触状態を斜め上方から見た状態を示す。図１３は、ベルト蛇行補正ロールへの中間転写ベルトの接触状態を上方から見た状態を示す。図１４は、ベルト蛇行補正部材のロール軸への保持状態を示す。図１５はベルト蛇行補正部材を示す。図１２〜図１４に示すように、本発明の第２の実施の形態に係るベルト蛇行補正機構２００（ベース５０等の構成部品を省略）は、ベルト蛇行補正部材２０１がベルト蛇行補正ロール３１のロール軸３１ａの軸線Ｏ３に対して傾斜する軸線Ｏ４の回りに回転する回転部２０２、及びこの回転部２０２を回転可能に保持する保持部２０３を有する移動部材によって形成されている点に特徴がある。 FIG. 12 shows the contact state of the intermediate transfer belt to the belt meandering correction roll as viewed obliquely from above. FIG. 13 shows a state in which the intermediate transfer belt is in contact with the belt meandering correction roll as viewed from above. FIG. 14 shows a state in which the belt meandering correction member is held on the roll shaft. FIG. 15 shows a belt meandering correction member. As shown in FIGS. 12 to 14, in the belt meandering correction mechanism 200 (components such as the base 50 are omitted) according to the second embodiment of the present invention, the belt meandering correction member 201 is provided on the belt meandering correction roll 31. It is formed by a moving member having a rotating part 202 that rotates around an axis O 4 inclined with respect to the axis O 3 of the roll shaft 31 a and a holding part 203 that rotatably holds the rotating part 202. There is.

このため、回転部２０２は、中間転写ベルト３３の掛け渡し部側縁３３ａとの間で第１押圧力ａ及び補正力ｅを授受する平面からなる第１面２０２ａを有し、全体が円環状の回転板によって形成されている。これにより、中間転写ベルト３３の走行による押圧によってベルト蛇行補正部材２０１の回転部２０２が回転することが可能となり、中間転写ベルト３３のロール掛け渡し部側縁３３ａと回転部２０２の第１面２０２ａとの間に発生する摩擦力による中間転写ベルト３３の磨耗発生を抑制することができる。   For this reason, the rotating unit 202 has a first surface 202a composed of a plane for transmitting and receiving the first pressing force a and the correction force e to and from the transfer portion side edge 33a of the intermediate transfer belt 33, and is entirely annular. It is formed by a rotating plate. Accordingly, the rotation portion 202 of the belt meandering correction member 201 can be rotated by the pressure generated by the travel of the intermediate transfer belt 33, and the roll transfer portion side edge 33a of the intermediate transfer belt 33 and the first surface 202a of the rotation portion 202 are rotated. It is possible to suppress the occurrence of wear of the intermediate transfer belt 33 due to the frictional force generated between the two.

保持部２０３は、力変換部材５２との間でロール揺動力ｂ及び第２押圧力ｄを授受する第２面２０３ａを有し、全体が截頭円錐状の基部２０４及び円板状の凸部２０５によって形成されている。   The holding unit 203 has a second surface 203a that receives and transmits the roll swinging force b and the second pressing force d with the force conversion member 52, and has a base portion 204 having a truncated cone shape and a disc-like convex portion as a whole. 205.

また、保持部２０３は、軸線Ｏ３に沿って開口するシャフト挿通孔２０３ｂ、及びこのシャフト挿通孔２０３ｂに連通するキー溝２０３ｃを有している。そして、ベルト蛇行補正ロール３１のロール軸３１ａにキー２０６を介して相対回転不能かつ移動可能に保持されている。 The holding portion 203 has a shaft insertion hole 203b which opens along the axis O 3, and a keyway 203c communicating with the shaft insertion hole 203b. The belt meander correction roll 31 is held on a roll shaft 31 a via a key 206 so as not to be relatively rotatable and movable.

キー２０６は、保持部２０３とロール軸３１ａ間、及びロール支持部５０（リンク５６）とロール軸３１ａ間に跨って介装されている。このため、リンク５６には支持孔５６ａに連通するキー溝５６ｂが、またロール軸３１ａにはその外周面に開口するキー溝３１０ａがそれぞれ設けられている。これにより、キー２０６の一方側端部が保持部２０３のキー溝２０３ｃ及びロール軸３１ａのキー溝３１０ａに、またその他方側端部がリンク５６のキー溝５６ｂ及びロール軸３１ａのキー溝３１０ａに嵌合される。   The key 206 is interposed between the holding unit 203 and the roll shaft 31a and between the roll support unit 50 (link 56) and the roll shaft 31a. Therefore, the link 56 is provided with a key groove 56b communicating with the support hole 56a, and the roll shaft 31a is provided with a key groove 310a opened on the outer peripheral surface thereof. As a result, one end of the key 206 is in the key groove 203c of the holding portion 203 and the key groove 310a of the roll shaft 31a, and the other end is in the key groove 56b of the link 56 and the key groove 310a of the roll shaft 31a. Mated.

また、ベルト蛇行補正部材２０１は、図１５に示すように、回転部２０２を中間転写ベルト３３（図１４に示す）側に移動規制する移動規制部２０７を有している。   Further, as shown in FIG. 15, the belt meandering correction member 201 has a movement restricting portion 207 that restricts the movement of the rotating portion 202 toward the intermediate transfer belt 33 (shown in FIG. 14).

移動規制部２０７は、ベルト蛇行補正ロール３１（図１４に示す）のロール軸３１ａを挿通させるシャフト挿通孔２０７ａ、及び固定用のビス２０８，２０８（図１４に示す）を挿通させるビス挿通孔２０７ｂ，２０７ｂを有し、全体が円板部材によって形成されている。   The movement restricting portion 207 includes a shaft insertion hole 207a for inserting the roll shaft 31a of the belt meandering correction roll 31 (shown in FIG. 14), and a screw insertion hole 207b for inserting fixing screws 208 and 208 (shown in FIG. 14). , 207b, and the whole is formed of a disk member.

このように構成されたベルト蛇行補正機構２００においては、中間転写ベルト３３に蛇行による第１押圧力ａが回転部２０２の第１面２０２ａに中間転写ベルト３３のロール掛け渡し部側縁３３ａを介して作用するため、中間転写ベルト３３が蛇行によってベルト蛇行補正部材２０１を押圧しても、ロール掛け渡し部側縁３３ａでの磨耗が発生し難くなり、中間転写ベルト３３の破断が抑制される。   In the belt meandering correction mechanism 200 configured as described above, the first pressing force a caused by meandering on the intermediate transfer belt 33 is applied to the first surface 202a of the rotating unit 202 via the roll transfer part side edge 33a of the intermediate transfer belt 33. Therefore, even if the intermediate transfer belt 33 presses the belt meandering correction member 201 by meandering, it is difficult for the roll transfer portion side edge 33a to wear, and the intermediate transfer belt 33 is prevented from being broken.

以上、本発明の画像形成装置（ベルト蛇行補正機構）を上記の実施の形態に基づいて説明したが、本発明は上記の実施の形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の態様において実施することが可能であり、例えば次に示すような変形も可能である。   The image forming apparatus (belt meandering correction mechanism) of the present invention has been described above based on the above embodiment, but the present invention is not limited to the above embodiment and is within the scope not departing from the gist thereof. The present invention can be implemented in various modes, and for example, the following modifications are possible.

（１）上記の各実施の形態では、ベルト蛇行補正ロール３１のロール軸３１ａの一方側端部及び他方側端部にベルト蛇行補正部材５８，５８がそれぞれ配置されている場合について説明したが、本発明はこれに限定されず、ベルト蛇行補正ロールのロール軸の片側端部にベルト蛇行補正部材を配置しても、ベルトの磨耗発生を抑制するという所期の目的を達成することができる。 (1) In each of the above-described embodiments, the case where the belt meandering correction members 58 and 58 are respectively disposed at one end and the other end of the roll shaft 31a of the belt meandering correction roll 31 has been described. The present invention is not limited to this, and even if a belt meandering correction member is disposed at one end of the roll shaft of the belt meandering correction roll, the intended purpose of suppressing belt wear can be achieved.

（２）上記の各実施の形態では、ベルト蛇行補正ロール３１（ロール軸３１ａ）がベース５０にロール支持部５１を介して移動不能に配置されている場合について説明したが、本発明はこれに限定されず、ベースに対してベルト蛇行補正ロールのロール軸を移動可能に配置してもよい。この場合、ベルト蛇行補正部材がベルト蛇行補正ロールのロール軸に回転不能かつ移動不能に配置されている。 (2) In each of the above embodiments, the case where the belt meandering correction roll 31 (roll shaft 31a) is disposed so as to be immovable via the roll support portion 51 on the base 50 has been described. It is not limited, You may arrange | position the roll axis | shaft of a belt meandering correction | amendment roll so that a movement is possible with respect to a base. In this case, the belt meandering correction member is disposed on the roll shaft of the belt meandering correction roll so as not to rotate and to move.

（３）上記の各実施の形態では、ベルトとして中間転写ベルト３３である場合について説明したが、本発明はこれに限定されず、例えば用紙を搬送する用紙搬送ベルトなど他のベルトであってもよい。 (3) In each of the above embodiments, the case where the intermediate transfer belt 33 is used as the belt has been described. However, the present invention is not limited to this, and other belts such as a paper transport belt for transporting paper may be used. Good.

（４）上記の各実施の形態では、プリンタに適用する場合について説明したが、本発明はこれに限定されず、複写機又はファクシミリに適用しても勿論よく、複写機，プリンタ及びファクシミリ等のうち少なくも２つを組み合わせてなる複合機に適用してもよい。 (4) In each of the above-described embodiments, the case where the present invention is applied to a printer has been described. However, the present invention is not limited to this, and may of course be applied to a copying machine or a facsimile, such as a copying machine, a printer, and a facsimile. You may apply to the multi-function machine which combines two at least.

（５）上記の各実施の形態では、画像形成装置１００が複数の感光体２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋを用いたカラー画像形成装置である場合について説明したが、本発明はこれに限定されず、単一の感光体を用いたモノクロ画像形成装置であってもよい。 (5) In each of the above embodiments, the case where the image forming apparatus 100 is a color image forming apparatus using a plurality of photoconductors 22Y, 22M, 22C, and 22K has been described. However, the present invention is not limited to this. A monochrome image forming apparatus using a single photoconductor may be used.

１０…画像形成装置、１１…筐体、１２…給紙トレイ、１３…用紙排出部、１４…用紙搬送路、１４ａ…ピックアップロール、１４ｂ…補正ロール、１４ｃ…搬送ロール、１４ｄ…定着ロール、１４ｅ…排出ロール、２０…画像形成部、２１Ｙ，２１Ｍ，２１Ｃ，２１Ｋ…画像形成ユニット、２２Ｙ，２２Ｍ，２２Ｃ，２２Ｋ…感光体、２３…帯電器、２４…現像器、２４ａ…ハウジング、２４ｂ…現像ロール、２４ｃ…供給オーガー、２４ｄ…攪拌オーガー、２５…感光体クリーニング部、２６Ｙ，２６Ｍ，２６Ｃ，２６Ｋ…一次転写ロール、２７…露光器、２７ａ…ポリゴンミラー、２７ｂ…ミラー、２７ｃ…フレーム、３０…駆動ロール、３１…ベルト蛇行補正ロール、３１ａ…ロール軸、３１０ａ…キー溝、３２…従動ロール、３３…中間転写ベルト、３３ａ…ロール掛け渡し部側縁、３４…二次転写ロール、３５Ｙ，３５Ｍ，３５Ｃ，３５Ｋ…トナーボックス、４０…ベルトクリーニング部、５０…ベース、５０ａ…側壁部、５１…ロール支持部、５１ａ…スプリング係止具、５２…力変換部材、５２ａ…接触部、５３…引張スプリング、５４…連結ピン、５５…リンク、５５ａ…スプリング係止部、５６…リンク、５６ａ…キー溝、５７…揺動回転ピン、５８…ベルト蛇行補正部材、５８ａ〜５８ｇ…第１面〜第７面、５８ｈ…シャフト挿通孔、１００…ベルト蛇行補正機構、２００…ベルト蛇行補正機構、２０１…ベルト蛇行補正部材、２０２…回転部、２０２ａ…第１面、２０３…保持部、２０３ａ第２面、２０３ｂ…シャフト挿通孔、２０３ｃ…キー溝、２０４…基部、２０５…凸部、２０６…キー、２０７…移動規制部、２０７ａ…シャフト挿通孔、２０７ｂ…ビス挿通孔、２０８…ビス、ａ…第１押圧力、ｂ…ロール揺動力、ｃ…ロール揺動復帰力、ｄ…第２押圧力、ｅ…補正力、Ｏ１〜Ｏ４…軸線、Ｐ…用紙
DESCRIPTION OF SYMBOLS 10 ... Image forming apparatus, 11 ... Housing | casing, 12 ... Paper feed tray, 13 ... Paper discharge part, 14 ... Paper conveyance path, 14a ... Pickup roll, 14b ... Correction roll, 14c ... Conveyance roll, 14d ... Fixing roll, 14e DESCRIPTION OF REFERENCE SIGNS ... Ejecting roll, 20 ... Image forming unit, 21Y, 21M, 21C, 21K ... Image forming unit, 22Y, 22M, 22C, 22K ... Photoconductor, 23 ... Charging device, 24 ... Developer, 24a ... Housing, 24b ... Developing Roll, 24c ... Supply auger, 24d ... Stirrer auger, 25 ... Photoconductor cleaning unit, 26Y, 26M, 26C, 26K ... Primary transfer roll, 27 ... Exposure unit, 27a ... Polygon mirror, 27b ... Mirror, 27c ... Frame, 30 ... Driving roll, 31 ... Belt meandering correction roll, 31a ... Roll shaft, 310a ... Key groove, 32 ... Following roll, 33 Intermediate transfer belt, 33a ... Rolling edge side edge, 34 ... secondary transfer roll, 35Y, 35M, 35C, 35K ... toner box, 40 ... belt cleaning part, 50 ... base, 50a ... side wall part, 51 ... roll support Part, 51a ... spring locking tool, 52 ... force conversion member, 52a ... contact part, 53 ... tension spring, 54 ... connecting pin, 55 ... link, 55a ... spring locking part, 56 ... link, 56a ... keyway, 57 ... Oscillating rotation pin, 58 ... Belt meandering correction member, 58a to 58g ... First surface to seventh surface, 58h ... Shaft insertion hole, 100 ... Belt meandering correction mechanism, 200 ... Belt meandering correction mechanism, 201 ... Belt meandering Correction member 202... Rotating part 202a... First surface 203. Holding part 203 a second surface 203 b Shaft insertion hole 203 c Key groove 204 207a ... Shaft insertion hole, 207b ... Screw insertion hole, 208 ... Screw, a ... First pressing force, b ... Roll rocking force, c ... Roll rocking dynamic return force, d ... second pressing force, e ... correction force, O 1 ~O 4 ... axis, P ... paper

Claims (7)

ベルトの蛇行による押圧力を受けてロール揺動力に変換する力変換部を有するベースと、
前記ベースに回転可能に配置され、前記ベルトを走行可能に掛け渡す複数のロールとを備え、
前記複数のロールは、前記ベースの前記力変換部から前記ロール揺動力を受けて揺動し、かつロール復帰力を受けて復帰するベルト蛇行補正用のロールを含み、
前記ベルト蛇行補正用のロールは、そのロール軸の少なくとも一方側の端部に前記ベルトの蛇行を補正するためのベルト蛇行補正部材が配置され、前記ベルト蛇行補正部材にロール端面に交差する方向に延びて前記ベルトのロール掛け渡し部側縁から前記ベルトの蛇行による押圧力を受ける第１面と、前記ベースの前記力変換部から前記ロール揺動力を受ける第２面とが設けられているベルト蛇行補正機構。 A base having a force conversion unit that receives a pressing force caused by meandering of the belt and converts it into a roll swinging force;
A plurality of rolls arranged rotatably on the base and over which the belt can run;
The plurality of rolls include a roll for belt meandering correction that swings by receiving the roll swinging force from the force converting portion of the base and that returns by receiving a roll return force,
In the belt meandering correction roll, a belt meandering correction member for correcting the meandering of the belt is disposed at an end of at least one side of the roll shaft, and the belt meandering correction member extends in a direction intersecting the roll end surface. A belt that is provided with a first surface that extends and receives a pressing force due to meandering of the belt from a side edge of the roll span portion of the belt, and a second surface that receives the roll swinging force from the force conversion portion of the base. Meander correction mechanism. 前記ベルト蛇行補正用のロールは、その軸線方向に移動不能に前記ベースに配置され、前記ベルト蛇行補正部材を前記ロール軸に相対回転不能かつ移動可能に保持する請求項１に記載のベルト蛇行補正機構。   2. The belt meandering correction according to claim 1, wherein the belt meandering correction roll is disposed on the base so as not to move in an axial direction thereof, and the belt meandering correction member is held on the roll shaft so as not to be relatively rotatable and movable. mechanism. 前記ベルト蛇行補正用のロールは、前記ベルト蛇行補正部材が前記第１面を平面又は曲面とし、前記第２面を平面とする移動部材によって形成されている請求項１に記載のベルト蛇行補正機構。   2. The belt meandering correction mechanism according to claim 1, wherein the belt meandering correction roll is formed by a moving member having the first surface as a flat surface or a curved surface and the second surface as a flat surface. . 前記ベルト蛇行補正用のロールは、前記ベルト蛇行補正部材が前記ロール軸に対して傾斜する軸線の回りに回転する回転部、及び前記回転部を回転可能に保持する保持部を有する移動部材によって形成され、前記回転部が平面からなる前記第１面を有し、前記保持部が円錐面からなる前記第２面を有する請求項１に記載のベルト蛇行補正機構。   The belt meandering correction roll is formed by a moving member having a rotating part in which the belt meandering correcting member rotates about an axis inclined with respect to the roll axis, and a holding part for rotatably holding the rotating part. 2. The belt meandering correction mechanism according to claim 1, wherein the rotating portion has the first surface made of a flat surface, and the holding portion has the second surface made of a conical surface. 前記ベルト蛇行補正用のロールは、前記ベルト蛇行補正部材が前記回転部を前記ベルト側に移動規制する移動規制部を有する請求項４に記載のベルト蛇行補正機構。   The belt meandering correction mechanism according to claim 4, wherein the belt meandering correction roll includes a movement restricting portion that restricts the movement of the belt meandering correcting member toward the belt. 前記ベルト蛇行補正用のロールは、前記ベルトに張力を付与するベルト張力付与手段によって前記ロール復帰力の一部が常時付与されている請求項１に記載のベルト蛇行補正機構。   2. The belt meandering correction mechanism according to claim 1, wherein a part of the roll restoring force is constantly applied to the belt meandering correction roll by belt tension applying means for applying tension to the belt. 用紙に画像を形成する画像形成部と、前記画像形成部で形成されたトナー像が転写される中間転写ベルトと、前記中間転写ベルトの蛇行を補正するベルト蛇行補正機構とを備えた画像形成装置であって、前記ベルト蛇行補正機構は請求項１乃至６のいずれか１項に記載のベルト蛇行補正機構である画像形成装置。
An image forming apparatus comprising: an image forming unit that forms an image on a sheet; an intermediate transfer belt to which a toner image formed by the image forming unit is transferred; and a belt meandering correction mechanism that corrects meandering of the intermediate transfer belt The image forming apparatus according to claim 1, wherein the belt meandering correction mechanism is a belt meandering correction mechanism according to claim 1.
JP2009078127A 2009-03-27 2009-03-27 Mechanism for correcting belt-meandering and image forming apparatus Pending JP2010230958A (en)

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US9291952B2 (en) 2014-02-07 2016-03-22 Ricoh Company, Ltd. Belt assembly and image forming apparatus including same
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