JP6501509B2 - Space adjustment mechanism and image forming apparatus - Google Patents

Space adjustment mechanism and image forming apparatus Download PDF

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JP6501509B2
JP6501509B2 JP2014250849A JP2014250849A JP6501509B2 JP 6501509 B2 JP6501509 B2 JP 6501509B2 JP 2014250849 A JP2014250849 A JP 2014250849A JP 2014250849 A JP2014250849 A JP 2014250849A JP 6501509 B2 JP6501509 B2 JP 6501509B2
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force
forming apparatus
image forming
image
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JP2016114649A (en
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修 笹岡
修 笹岡
健男 河波
健男 河波
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Canon Inc
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Description

本発明は、間隔調整機構及びそれを備えた画像形成装置に関する。   The present invention relates to a space adjusting mechanism and an image forming apparatus provided with the same.

従来、電子写真方式を利用した画像形成装置として、像担持体上に作像されたトナー像を記録紙(記録材)に直接転写するものや、中間転写ベルトを介して記録紙にフルカラーのトナー像を転写する方式のものがある。直接転写する転写方式では、像担持体に対向する形で転写部材を配置し、その間に記録紙を通すことで転写している。また中間転写ベルトを用いる方式では、まず各色の像担持体と一次転写部材間に挟持された中間転写ベルトにトナー像を転写する。その後、トナー像を保持した中間転写ベルトを所定の張架ローラと張架ローラに対向している二次転写部材間まで搬送し、二次転写ニップ間を通る記録紙にトナー像を二次転写することで画像を作成している。これらの一次転写部材、二次転写部材としては回転可能なローラやパッド部材等が用いられ、転写ニップを広くとるために材質は弾性体が用いられることが多い。   Conventionally, as an image forming apparatus using an electrophotographic method, a device that directly transfers a toner image formed on an image carrier onto a recording sheet (recording material), a full-color toner on a recording sheet through an intermediate transfer belt There is a method of transferring an image. In the transfer method in which direct transfer is performed, the transfer member is disposed to face the image carrier, and transfer is performed by passing a recording paper therebetween. In the method using the intermediate transfer belt, first, the toner image is transferred to the intermediate transfer belt held between the image carrier of each color and the primary transfer member. Thereafter, the intermediate transfer belt holding the toner image is conveyed between the predetermined tension roller and the secondary transfer member facing the tension roller, and the toner image is secondarily transferred onto the recording sheet passing between the secondary transfer nips. By creating an image. As the primary transfer member and the secondary transfer member, rotatable rollers, pad members and the like are used, and in order to widen the transfer nip, an elastic material is often used.

転写ニップは、像担持体やベルトと転写部材とが互いに圧接されることで形成されるものであるが、出荷時などの輸送において転写部材を像担持体等に長時間当接させたままにしておくと、熱の影響等で弾性体が塑性変形してしまうことがある。塑性変形すると転写ニップに十分な圧がかからず、転写不良が発生する可能性がある。このような問題を回避するために、特許文献1には、スペーサ部材を挟むことで弾性部材と対向ローラを離間させた状態で出荷し、使用前にユーザがそのスペーサ部材を引き抜くことでニップを形成する方法が開示されている。また、特許文献2には、使用者がスペーサ部材を引き抜く作業をなくすため、装置の駆動に連動して離間状態を解除する機構が開示されている。   The transfer nip is formed by the image carrier, the belt, and the transfer member being brought into pressure contact with each other, but the transfer member is kept in contact with the image carrier for a long time in transportation such as shipping. In this case, the elastic body may be plastically deformed due to the influence of heat or the like. When plastic deformation occurs, sufficient pressure is not applied to the transfer nip, which may cause a transfer failure. In order to avoid such a problem, Patent Document 1 discloses that the elastic member and the opposing roller are separated by sandwiching the spacer member and shipped, and the user pulls out the spacer member before use. Methods of forming are disclosed. Further, Patent Document 2 discloses a mechanism for releasing the separation state in conjunction with the driving of the device in order to eliminate the work of the user pulling out the spacer member.

特開2001−201914号公報JP 2001-201914 A 特開2007−322873号公報JP 2007-322873 A

特許文献1のようにユーザがスペーサ部材を引き抜く構成は、ユーザにとっては手間が増えるものとなる。装置設置時にできるだけユーザにストレスをかけないようにするためには、初期の立ち上げは、スペーサによる離間状態の解除を含め、自動で完了することが望ましい。また、特許文献2の機構は、連動のためのギアをローラ端部に配置する構成となっており、この構成では、2つのローラを離間させるためにはローラ外径よりも大きなギアをロータ端部に配置する必要がある。今後さらなる小型化の需要を考えた際、端部に大きなギアを配置することはスペース的にデメリットになる懸念がある。   The configuration in which the user pulls out the spacer member as in Patent Document 1 increases the time and effort for the user. In order to minimize user stress as much as possible when installing the device, it is desirable that the initial start-up be completed automatically, including the release of the separation state by the spacer. Further, the mechanism of Patent Document 2 has a configuration in which a gear for interlocking is disposed at a roller end, and in this configuration, in order to separate two rollers, a gear larger than the outer diameter of the roller is used as a rotor end. Need to be placed in the department. When considering the demand for further miniaturization in the future, there is a concern that placing a large gear at the end is a disadvantage in space.

本発明の目的は、装置の動作に連動した間隔調整動作が可能で、かつ、装置の小型化に有利な間隔調整機構を提供することである。   An object of the present invention is to provide a gap adjusting mechanism capable of performing a gap adjusting operation interlocked with the operation of the device and advantageous for downsizing of the device.

上記目的を達成するため、本発明の間隔調整機構は、
画像形成装置において、回転軸と、該回転軸に対向配置される対向部材と、の間隔を調整する間隔調整機構であって、
前記対向部材を前記回転軸に向かって付勢する付勢部と、
前記間隔を規制する規制部材であって、前記回転軸の外周面上を移動可能に前記回転軸に取り付けられ、回転する前記回転軸から前記外周面上を移動する力を受ける力受け部を有し、前記回転軸の回転によって、前記間隔が所定の間隔となるように前記付勢部の付勢力に作用する第1位置から、前記第1位置に対して前記回転軸の軸線方向に異なる位置で
あって、前記付勢力に対する作用の仕方が前記第1位置のときとは異なる第2位置へ移動可能に構成された規制部材と、
を備えることを特徴とする。
また、上記目的を達成するため、本発明の画像形成装置は、
記録材に画像形成する画像形成装置であって、
回転軸を備える回転体と、
前記回転軸に対向配置される対向部材と、
前記対向部材を前記回転軸に向かって付勢する付勢部材と、
前記付勢部材の付勢方向における前記回転軸と前記対向部材の間隔を調整する間隔調整機構と、
を備え、
前記間隔調整機構は、前記間隔を規制する規制部材を有し、前記規制部材は、前記回転軸の外周面上を移動可能に前記回転軸に取り付けられ、回転する前記回転軸から前記外周面上を移動する力を受ける力受け部を有し、前記回転軸の回転によって前記間隔が所定の間隔となるように前記付勢部材の付勢力に作用する第1位置から、前記第1位置に対して前記回転軸の軸線方向に異なる位置であって、前記付勢力に対する作用の仕方が前記第1位置のときとは変化する第2位置へ移動可能に構成されたことを特徴とする。
In order to achieve the above object, the spacing adjustment mechanism of the present invention
An image forming apparatus, comprising: an interval adjusting mechanism for adjusting an interval between a rotation axis and an opposing member disposed opposite to the rotation axis,
A biasing portion for biasing the opposing member toward the rotation axis;
The restricting member restricts the gap, and has a force receiving portion attached to the rotating shaft so as to be movable on the outer peripheral surface of the rotating shaft and receiving a force moving the outer peripheral surface from the rotating rotating shaft And a position different from the first position in the axial direction of the rotation shaft with respect to the first position from the first position acting on the urging force of the urging portion such that the distance becomes a predetermined distance by the rotation of the rotation shaft. A restricting member configured to be movable to a second position different from that at the first position, in a method of acting on the biasing force;
And the like.
Further, in order to achieve the above object, the image forming apparatus of the present invention is
An image forming apparatus for forming an image on a recording material
A rotating body having a rotating shaft,
An opposing member disposed opposite to the rotation axis;
An urging member for urging the opposing member toward the rotation axis;
An interval adjusting mechanism for adjusting an interval between the rotating shaft and the opposing member in the biasing direction of the biasing member;
Equipped with
The space adjustment mechanism has a restriction member for restricting the space, and the restriction member is attached to the rotation shaft so as to be movable on the outer peripheral surface of the rotation shaft, and rotates from the rotating shaft to the rotation has a force receiving portion for receiving a force to move, by rotation of the rotary shaft, from a first position where the gap is applied to the biasing force of the pre-Symbol biasing member so as to have a predetermined interval, said first position On the other hand, it is characterized in that it is configured to be movable to a second position which is different in the axial direction of the rotating shaft and in which the manner of action on the biasing force is different from that at the first position .

本発明によれば、装置の動作に連動した間隔調整動作が可能で、かつ、装置の小型化に有利な間隔調整機構を提供することができる。   According to the present invention, it is possible to provide a gap adjusting mechanism capable of the gap adjusting operation interlocked with the operation of the device and advantageous for the miniaturization of the device.

本実施例に係る画像形成装置の概略断面図Schematic cross-sectional view of an image forming apparatus according to the present embodiment 実施例1における一次転写部の概略斜視図Schematic perspective view of the primary transfer portion in Example 1 実施例1における一次転写部の離間状態の図Diagram of the separated state of the primary transfer portion in Example 1 実施例1における一次転写部の当接状態の図Diagram of the contact state of the primary transfer portion in Example 1 実施例2における二次転写部の概略斜視図Schematic perspective view of the secondary transfer portion in Example 2 実施例2における二次転写部の離間状態の図Diagram of the separated state of the secondary transfer portion in Example 2 実施例2における二次転写部の当接状態の図Diagram of the contact state of the secondary transfer portion in Example 2 実施例3における現像部の離間状態の図Diagram of the separated state of the developing unit in Example 3 実施例3における現像部の当接状態の図Diagram of the contact state of the developing unit in Example 3 実施例4における帯電部の離間状態の図Diagram of separated state of charging unit in Embodiment 4 実施例4における帯電部の当接状態の図Diagram of contact state of charging unit in Embodiment 4

以下に図面を参照して、この発明を実施するための形態を、実施例に基づいて例示的に詳しく説明する。ただし、この実施の形態に記載されている構成部品の寸法、材質、形状それらの相対配置などは、発明が適用される装置の構成や各種条件により適宜変更されるべきものである。すなわち、この発明の範囲を以下の実施の形態に限定する趣旨のものではない。   Hereinafter, with reference to the drawings, modes for carrying out the present invention will be exemplarily described in detail based on examples. However, the dimensions, materials, shapes, etc. of the components described in this embodiment should be changed as appropriate depending on the configuration of the apparatus to which the invention is applied and various conditions. That is, the scope of the present invention is not intended to be limited to the following embodiments.

<実施例1>
図1〜図4を参照して、本発明の実施例1に係る間隔調整機構及び画像形成装置について説明する。ここでは、本発明を適用した画像形成装置として、カラーレーザービームプリンタを例示して説明する。
Example 1
A space adjusting mechanism and an image forming apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. Here, a color laser beam printer will be described as an example of an image forming apparatus to which the present invention is applied.

(画像形成装置の全体構成)
図1は、本実施例に係る画像形成装置の全体構成の概要を示す模式的断面図である。
給送トレイ1内に積載収納された記録材2は、図中時計回り方向に回転する給送ローラ3により給送され、搬送ローラ4に送られ、ベルト内駆動ローラ5と二次転写ローラ6のニップ部へ送られる。
(Whole configuration of image forming apparatus)
FIG. 1 is a schematic cross-sectional view showing an outline of the entire configuration of the image forming apparatus according to the present embodiment.
The recording material 2 stacked and stored in the feeding tray 1 is fed by the feeding roller 3 which rotates in the clockwise direction in the drawing, and is fed to the conveying roller 4, and the in-belt driving roller 5 and the secondary transfer roller 6 Sent to the nip of

画像形成部を構成する像担持体としての感光ドラム7Y、7M、7C、7Kは、図中反時計回り方向に回転する。各画像形成部では、各感光ドラムの外周面に露光装置(レーザ
ースキャナ)8からのレーザ光により静電潜像が順次形成され、続いてその静電潜像が現像ローラ9Y、9M、9C、9Kにより現像され、トナー像が形成される。感光ドラム7Y、7M、7C、7Kに形成されたトナー像は、一次転写ユニット10Y、10M、10C、10Kにより押圧、電圧印加され、中間転写ベルト11に転写される。中間転写ベルト11は、ベルト内駆動ローラ5、二次転写ローラ6及びテンションローラ12の3個のローラに張架された、円筒且つ無端ベルト状のフィルムである。中間転写ベルト11は、ベルト内駆動ローラ5が図中時計回りに回転駆動されることによって、感光ドラム1の表面の移動速度と略同じ速度で移動する。
The photosensitive drums 7Y, 7M, 7C, and 7K as image bearing members constituting the image forming portion rotate in the counterclockwise direction in the drawing. In each image forming unit, electrostatic latent images are sequentially formed on the outer peripheral surface of each photosensitive drum by laser light from the exposure device (laser scanner) 8, and then the electrostatic latent images are developed by developing rollers 9Y, 9M, 9C, The toner is developed by 9K to form a toner image. The toner images formed on the photosensitive drums 7Y, 7M, 7C, 7K are pressed by the primary transfer units 10Y, 10M, 10C, 10K, voltage is applied, and transferred to the intermediate transfer belt 11. The intermediate transfer belt 11 is a cylindrical and endless belt-like film stretched around three rollers of an in-belt drive roller 5, a secondary transfer roller 6, and a tension roller 12. The intermediate transfer belt 11 moves at substantially the same speed as the movement speed of the surface of the photosensitive drum 1 by the in-belt drive roller 5 being rotated clockwise in the figure.

カラー画像を形成する場合は、感光ドラム7Y、7M、7C、7Kにイエロー、マゼンダ、シアン、ブラック各色のトナー像が現像される。そして、それぞれに形成されたトナー像が、一次転写ユニット10Y、10M、10C、10Kにより中間転写ベルト11に順次転写される。次に、中間転写ベルト11に形成されたトナー像は、ベルト内駆動ローラ5と二次転写ローラ6のニップ部に送られた記録材2に一括転写される。更に、トナー像が転写された記録材2は、定着フィルム13と加圧ローラ14のニップ部へ送られ、ここで加熱及び加圧されてトナー像が記録材2に定着される。トナー像が定着された記録材2は、排出ローラ15と排出コロ16により排出される。   When forming a color image, toner images of yellow, magenta, cyan and black are developed on the photosensitive drums 7Y, 7M, 7C and 7K. Then, the toner images formed on each are sequentially transferred to the intermediate transfer belt 11 by the primary transfer units 10Y, 10M, 10C, and 10K. Next, the toner images formed on the intermediate transfer belt 11 are collectively transferred onto the recording material 2 sent to the nip portion between the in-belt drive roller 5 and the secondary transfer roller 6. Further, the recording material 2 onto which the toner image has been transferred is sent to the nip portion between the fixing film 13 and the pressure roller 14, where it is heated and pressed to fix the toner image on the recording material 2. The recording material 2 on which the toner image is fixed is discharged by the discharge roller 15 and the discharge roller 16.

(一次転写部の構成)
図2は、一次転写部の概略構成を説明する模式的斜視図である。上記4つの一次転写部の構成はトナーの色の違いを除いてそれぞれ同一構成であり、ここでは、各符号における添え字Y、M、C、Kを省略し、1つの一次転写部の構成についてのみ説明する。
(Configuration of primary transfer unit)
FIG. 2 is a schematic perspective view illustrating a schematic configuration of a primary transfer unit. The configurations of the four primary transfer portions are the same as each other except for the difference in toner color. Here, the suffixes Y, M, C, and K in the respective reference signs are omitted, and the configuration of one primary transfer portion Only explain.

感光ドラム7は、駆動手段(不図示)によって図中反時計回りに回転駆動される。感光ドラム7の表面は、帯電ローラ17により一様に帯電される。次いで、露光装置8より画像情報に従ったレーザ光Lが感光ドラム7に照射され、静電潜像が形成される。更に感光ドラム7の表面が図中反時計回り方向に進むと、現像ローラ9により画像情報に従って感光ドラム7上に形成された潜像がトナー像として可視化される。現像ローラ9は、反転現像方式にて、感光ドラム7上の潜像を現像する。すなわち、現像ローラ9は一様帯電された感光ドラム7上の画像部(露光部)に、感光ドラム7の帯電極性(負極性)と同極性に帯電したトナー(負極性)を付着させて現像を行う。   The photosensitive drum 7 is rotationally driven counterclockwise in the figure by a driving unit (not shown). The surface of the photosensitive drum 7 is uniformly charged by the charging roller 17. Subsequently, the photosensitive drum 7 is irradiated with laser light L according to the image information from the exposure device 8 to form an electrostatic latent image. Further, when the surface of the photosensitive drum 7 advances in the counterclockwise direction in the drawing, the latent image formed on the photosensitive drum 7 is visualized as a toner image according to the image information by the developing roller 9. The developing roller 9 develops the latent image on the photosensitive drum 7 by a reversal developing method. That is, the developing roller 9 adheres a toner (negative polarity) charged to the same polarity as the charging polarity (negative polarity) of the photosensitive drum 7 on the image portion (exposure portion) on the uniformly charged photosensitive drum 7 to develop I do.

感光ドラム7の図中反時計回り方向において、現像位置より下流側には、中間転写体としての中間転写ベルト11が配置されている。中間転写ベルト11は図中の矢印方向に回転駆動されている。中間転写ベルト11を挟んで感光ドラム7と対向する位置には、一次転写ローラ19が配置されている。一次転写ローラ19は、一次転写軸受け部材20A、20B(対向部材、支持部材)によって、軸(回転軸)の両端が回転可能に支持(軸支)されている。一次転写軸受け部材20A、20Bは、例えば装置本体のフレームに、感光ドラム7の軸端部に対して接離方向に移動可能に支持されている。一次転写軸受け部材20A、20Bは、一次転写ばね部材21A、21B(付勢部材)に付勢されることで、一次転写ローラ19を感光ドラム7及び中間転写ベルト11に押圧している。この押圧により、記録材を挟持搬送する一次転写ニップ22が形成されている。感光ドラム7及び中間転写ベルト11が回転すると、感光ドラム7上に形成されたトナー像は中間転写ベルト11の外周面に一次転写される。このとき、一次転写ローラ19には、トナーの帯電極性(負極性)とは逆極性(正極性)の一次転写電圧が、一次転写電源(不図示)により印加される。   In the counterclockwise direction in the drawing of the photosensitive drum 7, an intermediate transfer belt 11 as an intermediate transfer member is disposed downstream of the development position. The intermediate transfer belt 11 is rotationally driven in the direction of the arrow in the figure. A primary transfer roller 19 is disposed at a position facing the photosensitive drum 7 with the intermediate transfer belt 11 interposed therebetween. The primary transfer roller 19 is rotatably supported at both ends of a shaft (rotational shaft) by the primary transfer bearing members 20A and 20B (opposite members, support members). The primary transfer bearing members 20A and 20B are, for example, supported by a frame of the apparatus body so as to be movable in the contact / separation direction with respect to the axial end of the photosensitive drum 7. The primary transfer bearing members 20A and 20B press the primary transfer roller 19 against the photosensitive drum 7 and the intermediate transfer belt 11 by being biased by the primary transfer spring members 21A and 21B (biasing members). By this pressing, a primary transfer nip 22 for holding and conveying the recording material is formed. When the photosensitive drum 7 and the intermediate transfer belt 11 rotate, the toner image formed on the photosensitive drum 7 is primarily transferred onto the outer peripheral surface of the intermediate transfer belt 11. At this time, a primary transfer voltage (not shown) having a polarity (positive polarity) reverse to the charging polarity (negative polarity) of the toner is applied to the primary transfer roller 19.

以上のような帯電、露光、現像、一次転写工程を、中間転写ベルト11表面の移動方向上流側から順番に、イエロー、マゼンタ、シアン、ブラックの各色の各一次転写部で行う。これにより、中間転写ベルト11上にイエロー、マゼンタ、シアン、ブラックの4色の
トナー像が重なったフルカラー画像が形成される。
The above-described charging, exposure, development, and primary transfer steps are performed in order from the upstream side in the moving direction of the surface of the intermediate transfer belt 11 at each primary transfer portion of each color of yellow, magenta, cyan and black. As a result, a full color image in which toner images of four colors of yellow, magenta, cyan and black are superimposed on the intermediate transfer belt 11 is formed.

(一次転写部の離間構成)
図3、図4を参照して、一次転写部の離間構成(間隔調整機構)について説明する。
図3は、一次転写ローラ19を中間転写ベルト11及び感光ドラム7から離間させた状態(第1位置)を説明する模式図であり、(a)は全体図、(b)は(a)の一部を拡大した詳細図、(c)は(b)のAA断面図である。図4は、一次転写ローラ19を中間転写ベルト11を介して感光ドラム7に当接させた状態(第2位置)を説明する模式図であり、(a)は全体図、(b)は(a)の一部を拡大した詳細図、(c)は(b)のBB断面図である。画像形成装置の出荷時には、図3に示すような、一次転写ローラ19を感光体7、中間転写ベルト11から離間させた構成をとる。一方、画像印刷時(画像形成動作時)には、図4に示すような、一次転写ローラ19、感光体7、中間転写ベルト11を互いに当接させた構成をとる。
(Separating configuration of primary transfer section)
With reference to FIG. 3 and FIG. 4, the separation configuration (space adjustment mechanism) of the primary transfer portion will be described.
FIG. 3 is a schematic view for explaining the state (first position) in which the primary transfer roller 19 is separated from the intermediate transfer belt 11 and the photosensitive drum 7, (a) is an overall view, (b) is an (a) (C) is an AA sectional view of (b). 4A and 4B are schematic diagrams for explaining the state (second position) in which the primary transfer roller 19 is in contact with the photosensitive drum 7 via the intermediate transfer belt 11. FIG. (c) is a cross-sectional view taken along the line BB in (b). At the time of shipment of the image forming apparatus, the primary transfer roller 19 is separated from the photosensitive member 7 and the intermediate transfer belt 11 as shown in FIG. On the other hand, at the time of printing an image (during an image forming operation), as shown in FIG. 4, the primary transfer roller 19, the photosensitive member 7, and the intermediate transfer belt 11 are in contact with each other.

感光体7の軸7bの両端部には、感光体7(第1の回転体)と一次転写ローラ19(転写部材、第2の回転体)の離間(間隔の規制)を行う一次転写離間部材23A、23B(規制部材)が配置されている。一次転写離間部材23A、23Bは、筒状(環状)の部材であり、感光体7の軸の両端部における外周面に回転可能に取り付けられている。一次転写離間部材23A、23Bは、感光体7と接触する内周面に斜面部23a(力受け部)を有する。また、一次転写離間部材23A、23Bは、一次転写軸受け部材20A、20Bと接触する外周面23b上に、一次転写軸受け部材20A、20Bと係合可能に構成された係合溝23c(案内部を構成する溝)を有する。感光体7の軸の両端部には、それぞれ、一次転写離間部材23A、23Bと接触する離間部材押出部7a(力付与部)が設けられている。一次転写軸受け部材20A、20Bには、それぞれ、軸受け部20aと、係合溝23cに嵌合可能な離間部材係合部20b(案内部を構成する凸部)と、を有する。   A primary transfer and separation member that separates (regulates the interval) between the photosensitive member 7 (first rotating body) and the primary transfer roller 19 (transfer member, second rotating body) at both ends of the shaft 7b of the photosensitive body 7 23A, 23B (regulating members) are disposed. The primary transfer separation members 23A and 23B are cylindrical (annular) members, and are rotatably attached to the outer peripheral surfaces of both ends of the shaft of the photosensitive member 7. The primary transfer separation members 23A and 23B have slopes 23a (force receiving portions) on the inner peripheral surface in contact with the photosensitive member 7. Further, the primary transfer separation members 23A and 23B are provided with engaging grooves 23c (guide portions configured to be engageable with the primary transfer bearing members 20A and 20B on the outer peripheral surface 23b in contact with the primary transfer bearing members 20A and 20B. Have a groove). At both ends of the shaft of the photosensitive member 7, separating member push-out portions 7a (force applying portions) which are in contact with the primary transfer separating members 23A and 23B are provided. Each of the primary transfer bearing members 20A and 20B has a bearing portion 20a and a spacing member engaging portion 20b (a convex portion constituting a guiding portion) which can be fitted to the engaging groove 23c.

離間時には、一次転写離間部材23A、23Bの外周面23bと一次転写軸受け部材20A、20Bの離間部材係合部20bが接触することで、感光体7と一次転写ローラ19及び中間転写ベルト11を所定の間隔で離間させることができる。本構成であれば、離間部材係合部20bの長さ(高さ)を変えることで離間量の調整もでき、かつギアのように全周に広いスペースも必要としない。   At the time of separation, the outer peripheral surface 23b of the primary transfer separating members 23A and 23B and the separating member engaging portion 20b of the primary transfer bearing members 20A and 20B come into contact with each other to set the photosensitive body 7, the primary transfer roller 19 and the intermediate transfer belt 11 Can be spaced apart. With this configuration, the amount of separation can be adjusted by changing the length (height) of the separation member engaging portion 20b, and a large space is not required around the entire circumference as in a gear.

次に自動当接動作について、説明する。自動当接動作とは、図3のように感光体7が一次転写ローラ19と離間している状態から、図4のような一次転写が可能となる状態までの動作のことである。モータなどの駆動体(駆動源)から力を受けて感光体7が回転すると、軸(回転軸)の端部に取り付けている一次転写離間部材23A、23Bも連れまわって回転する。一次転写離間部材23A、23Bが回転すると、係合溝23cに一次転写軸受け部材20A、20Bの離間部材係合部20bが嵌る。係合部20bが係合溝23cに嵌ることで一次転写離間部材23A、23Bの回転は制止される。感光体7は駆動体から力を受け回転し続けているので、回転方向に係止された一次転写離間部材23A、23Bは、離間部材押出部7aから斜面部23aに力を受けて、軸方向に移動を開始する。この移動により、一次転写離間部材23A、23Bと一次転写軸受け部材20A、20Bの係合が軸方向で外れ、感光体7と一次転写ローラ19が当接する。   Next, the automatic contact operation will be described. The automatic contact operation is an operation from the state where the photosensitive member 7 is separated from the primary transfer roller 19 as shown in FIG. 3 to the state where the primary transfer as shown in FIG. 4 is possible. When the photosensitive member 7 is rotated by receiving a force from a driving body (driving source) such as a motor, the primary transfer separation members 23A and 23B attached to the end of the shaft (rotational shaft) are also rotated along with it. When the primary transfer spacing members 23A and 23B rotate, the spacing member engaging portions 20b of the primary transfer bearing members 20A and 20B fit into the engagement grooves 23c. The engagement of the engagement portion 20b with the engagement groove 23c prevents the rotation of the primary transfer separation members 23A and 23B. Since the photosensitive member 7 continues to receive force from the driving member and continues to rotate, the primary transfer separation members 23A and 23B locked in the rotational direction receive force from the separation member push-out portion 7a to the slope portion 23a, and the axial direction is obtained. Start moving to By this movement, the engagement between the primary transfer separating members 23A and 23B and the primary transfer bearing members 20A and 20B is disengaged in the axial direction, and the photosensitive member 7 abuts on the primary transfer roller 19.

なお、一次転写離間部材23A、23Bは、軸方向で一次転写軸受け部材20A、20Bから外れたのち、感光体7と連れまわって回転し続け、一次転写や感光体7の回転に対する邪魔にはならない。また、逆に当接状態から離間状態にする際は、一次転写離間部材23A、23Bを手動で軸方向に移動させ、一次転写軸受け部材20A、20Bと当接するポジションに移動させることで、一次転写ニップ22の離間状態を作り出すことができる。   After the primary transfer separation members 23A and 23B are separated from the primary transfer bearing members 20A and 20B in the axial direction, the primary transfer separation members 23A and 23B continue to rotate together with the photosensitive member 7, and do not interfere with primary transfer or rotation of the photosensitive member 7. . Conversely, when changing from the contact state to the separated state, the primary transfer separation members 23A and 23B are manually moved in the axial direction and moved to positions in contact with the primary transfer bearing members 20A and 20B, thereby performing the primary transfer. A separation of the nip 22 can be created.

<本実施例の優れた点>
本実施例に係る間隔調整機構は、感光ドラム7の軸7b両端部と、これに対向配置される一次転写軸受け部材20A、20Bとの間隔を調整(第1間隔→第2間隔)することで、感光ドラム7と一次転写ローラ19の間隔を調整(離間→当接)するものである。間隔調整機構は、概略、一次転写軸受け部材20A、20Bを感光体ドラム7の軸端部に向かって付勢する一次転写ばね部材21A、21Bからなる付勢部と、一次転写離間部材23A、23Bと、で構成される。一次転写離間部材23A、23Bは、感光ドラム7の軸の外周面上を移動可能に構成されており、回転する感光ドラム7の軸からその外周面上を移動する力を受けるように構成されている。
<Superior points of this embodiment>
The space adjusting mechanism according to the present embodiment adjusts the space between the both ends of the shaft 7b of the photosensitive drum 7 and the primary transfer bearing members 20A and 20B disposed to face this (first space → second space). The distance between the photosensitive drum 7 and the primary transfer roller 19 is adjusted (separation → contact). The interval adjusting mechanism generally includes an urging portion comprising primary transfer spring members 21A and 21B for urging primary transfer bearing members 20A and 20B toward the axial end of photosensitive drum 7, and primary transfer separation members 23A and 23B. And consists of. The primary transfer separation members 23A and 23B are configured to be movable on the outer peripheral surface of the shaft of the photosensitive drum 7, and configured to receive a force moving from the shaft of the rotating photosensitive drum 7 on the outer peripheral surface. There is.

一次転写離間部材23A、23Bは、まず、回転する感光ドラム7の軸と連れまわって周方向に回転する。この回転により、一次転写離間部材23A、23Bは、一次転写軸受け部材20A、20Bに対して相対移動(相対回転)することになる。この相対移動により、一次転写離間部材23A、23Bの外周面23bと摺動接触していた一次転写軸受け部材20A、20Bの離間部材係合部20bは、外周面23bに形成された係合溝23cに嵌る状態になる。これにより、一次転写離間部材23A、23Bは、回転が規制された状態となり、感光ドラム7に対して相対移動する状態に変化する。このとき、係合溝23c側壁が一次転写離間部材23A、23Bにおける感光ドラム7軸の軸線回りの移動を規制する回り止め部として機能し、一次転写離間部材23A、23Bは、軸線方向の移動は許容されつつ軸線回りの移動が規制された状態となる。   First, the primary transfer separation members 23A and 23B rotate in the circumferential direction along with the axis of the rotating photosensitive drum 7. By this rotation, the primary transfer separation members 23A and 23B move (relatively rotate) relative to the primary transfer bearing members 20A and 20B. By this relative movement, the separation member engaging portion 20b of the primary transfer bearing members 20A and 20B in sliding contact with the outer peripheral surface 23b of the primary transfer separation members 23A and 23B is an engagement groove 23c formed on the outer peripheral surface 23b. It will be in the state of fitting. As a result, the rotation of the primary transfer separation members 23A and 23B is restricted, and the primary transfer separation members 23A and 23B move relative to the photosensitive drum 7. At this time, the side walls of the engagement groove 23c function as a rotation stopper for restricting the movement of the primary transfer separating members 23A and 23B around the axis of the photosensitive drum 7 axis, and the primary transfer separating members 23A and 23B move in the axial direction The movement around the axis is restricted while being permitted.

一次転写離間部材23A、23Bは、感光ドラム7に対する相対移動によって、今度は、感光ドラム7の離間部材押出部7aから斜面部23aに力を受ける状態となる。傾斜部23aは、一次転写離間部材23A、23Bの内周面上を周方向及び軸線方向に対して斜めに延びる面であり、軸7bの外周面上に形成された突起である離間部材押出部7aから軸線方向に作用する分力を含む力を受けるように構成されている。これにより、一次転写離間部材23A、23Bは、感光ドラム7の軸及び一次転写軸受け部材20A、20Bに対して軸7bの中央側から離れる方向、すなわち軸7bのより端部側へ軸方向に移動する。   The primary transfer and separation members 23A and 23B are now in a state of receiving a force from the separation member pushing portion 7a of the photosensitive drum 7 to the slope portion 23a by relative movement with respect to the photosensitive drum 7. The inclined portion 23a is a surface extending obliquely on the inner peripheral surface of the primary transfer and separation members 23A and 23B with respect to the circumferential direction and the axial direction, and is a protrusion formed on the outer peripheral surface of the shaft 7b. It is configured to receive a force including a component acting in an axial direction from 7a. Thereby, the primary transfer separation members 23A and 23B move in the direction away from the center side of the shaft 7b with respect to the shaft of the photosensitive drum 7 and the primary transfer bearing members 20A and 20B, that is, move in the axial direction toward the end of the shaft 7b. Do.

一次転写離間部材23A、23Bは、まず、付勢部の付勢力に作用する位置、具体的には、感光ドラム7の軸と一次転写軸受け部材20A、20Bに挟まれて付勢部の付勢力に抗する力を発揮する位置(第1位置)にある。そして、上記軸方向の相対移動により、付勢部の付勢力に対する作用の仕方が変化する位置、具体的には、感光ドラム7の軸と一次転写軸受け部材20A、20Bに挟まれず、付勢部の付勢力に抗する力を発揮しない位置(第2位置)に移動する。   First, the primary transfer separation members 23A and 23B are at positions acting on the biasing force of the biasing portion, specifically, the biasing force of the biasing portion between the shaft of the photosensitive drum 7 and the primary transfer bearing members 20A and 20B. In a position (first position) that exerts a force to resist. Then, the position at which the manner of action of the urging portion with respect to the urging force changes due to the relative movement in the axial direction, specifically, the urging portion without being pinched by the shaft of the photosensitive drum 7 and the primary transfer bearing members 20A and 20B. Move to a position (second position) that does not exert a force against the biasing force of the

以上のような構成により、シンプルで小型な構成でありながら、自動で離間状態を解除することができる間隔調整機構を実現することができる。なお、離間部材係合部20b、係合溝23c、離間部材押出部7a、斜面部23a等の各種寸法(高さや深さ、幅、角度等)は、感光ドラム7の回転による一次転写離間部材23A、23Bのスムーズな軸方向移動を可能にすべく適宜設定されるものである。   According to the above configuration, it is possible to realize the interval adjustment mechanism capable of automatically releasing the separation state while having a simple and small configuration. The dimensions (height, depth, width, angle, etc.) of the separating member engaging portion 20b, the engaging groove 23c, the separating member pushing portion 7a, the slope portion 23a, etc. are the primary transfer separating member by the rotation of the photosensitive drum 7. It is appropriately set to enable smooth axial movement of 23A and 23B.

<実施例2>
図5〜図7を参照して、本発明の実施例2に係る間隔調整機構及び画像形成装置について説明する。ここでは、実施例1と同様の構成については、同符号を付して説明を省略する。ここで特に説明しない事項については実施例1と同様である。
Example 2
A space adjusting mechanism and an image forming apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 5 to 7. Here, about the same composition as Example 1, the same numerals are attached and explanation is omitted. Matters not particularly described here are the same as in the first embodiment.

(二次転写部の構成)
図5は、二次転写部の概略構成を説明する模式的斜視図である。ベルト内駆動ローラ5は、モータ等の駆動手段(不図示)によって図中時計回りに回転駆動される。ベルト内駆動ローラ5は、テンションローラ12とで保持した中間転写ベルト11を回転させ、一次転写部で転写されたフルカラートナー像を二次転写部まで搬送する。二次転写部では、中間転写ベルト11を挟んでベルト内駆動ローラ5と対向する位置に二次転写ローラ6が配置されている。二次転写ローラ6は、二次転写軸受け部材24A、24Bによって保持されている。二次転写軸受け部材24A、24Bは、二次転写ばね部材25A、25B(付勢部材)から力を受け、二次転写ローラ6をベルト内駆動ローラ5及び中間転写ベルト11に押圧している。この押圧により、二次転写ニップ26が形成されている。二次転写ニップ26まで搬送されたトナー像は、搬送ローラ4によって運ばれた記録材2に二次転写される。この時、二次転写ローラ6には、トナーの帯電極性(負極性)とは逆極性(正極性)の二次転写電圧が、二次転写電源(不図示)により印加される。以上のような二次転写工程を経て、記録材2にフルカラー画像が形成される。
(Configuration of secondary transfer unit)
FIG. 5 is a schematic perspective view illustrating a schematic configuration of the secondary transfer unit. The in-belt drive roller 5 is rotationally driven clockwise in the figure by drive means (not shown) such as a motor. The in-belt drive roller 5 rotates the intermediate transfer belt 11 held by the tension roller 12 and conveys the full-color toner image transferred at the primary transfer portion to the secondary transfer portion. In the secondary transfer portion, the secondary transfer roller 6 is disposed at a position facing the in-belt drive roller 5 with the intermediate transfer belt 11 interposed therebetween. The secondary transfer roller 6 is held by secondary transfer bearing members 24A and 24B. The secondary transfer bearing members 24A and 24B receive a force from the secondary transfer spring members 25A and 25B (biasing members), and press the secondary transfer roller 6 against the in-belt drive roller 5 and the intermediate transfer belt 11. The secondary transfer nip 26 is formed by this pressing. The toner image conveyed to the secondary transfer nip 26 is secondarily transferred to the recording material 2 conveyed by the conveyance roller 4. At this time, a secondary transfer voltage (not shown) having a reverse polarity (positive polarity) to the charging polarity (negative polarity) of the toner is applied to the secondary transfer roller 6. Through the secondary transfer process as described above, a full color image is formed on the recording material 2.

(二次転写部の離間構成)
図6、図7を参照して、二次転写部の離間構成(間隔調整機構)について説明する。
図6は、二次転写ローラ6を中間転写ベルト11及びベルト内駆動ロータ5から離間させた状態(第1位置)を説明する模式図であり、(a)は全体図、(b)は(a)の一部を拡大した詳細図、(c)は(b)のCC断面図である。図7は、二次転写ローラ6を中間転写ベルト11を介してベルト内駆動ロータ5に当接させた状態(第2位置)を説明する模式図であり、(a)は全体図、(b)は(a)の一部を拡大した詳細図、(c)は(b)のDD断面図である。画像形成装置の出荷時には、図6に示すような、二次転写ローラ6とベルト内駆動ローラ5及び中間転写ベルト11を離間させる構成をとる。一方、画像印刷時には、図7に示すような、二次転写ローラ6とベルト内駆動ローラ5及び中間転写ベルト11を当接させる構成をとる。
(Separating configuration of secondary transfer unit)
With reference to FIG. 6 and FIG. 7, the separation configuration (space adjustment mechanism) of the secondary transfer portion will be described.
FIG. 6 is a schematic view for explaining a state (first position) in which the secondary transfer roller 6 is separated from the intermediate transfer belt 11 and the in-belt drive rotor 5, in which (a) is a general view and (b) is (c) is a CC cross-sectional view of (b). FIG. 7 is a schematic view for explaining a state (second position) in which the secondary transfer roller 6 is in contact with the in-belt drive rotor 5 via the intermediate transfer belt 11, and (a) is a general view, (b ) Is a detailed view in which a part of (a) is enlarged, and (c) is a DD cross-sectional view of (b). At the time of shipment of the image forming apparatus, as shown in FIG. 6, the secondary transfer roller 6, the in-belt drive roller 5 and the intermediate transfer belt 11 are separated. On the other hand, when printing an image, as shown in FIG. 7, the secondary transfer roller 6, the in-belt drive roller 5 and the intermediate transfer belt 11 are in contact with each other.

ベルト内駆動ローラ5の軸5b(回転軸)の両端部には、ベルト内駆動ローラ5(第1の回転体)と二次転写ローラ6(第2の回転体)の離間を行う二次転写離間部材27A、27B(規制部材)が配置されている。二次転写離間部材27A、27Bは、環状部材であり、ベルト内駆動ローラ5の軸5bと対向する内周面に斜面部27a(力受け部)を有する。また、二次転写離間部材27A、27Bは、二次転写軸受け部材24A、24Bと接触する外周面27bと、外周面上に二次転写軸受け部材24A、24Bと係合する係合溝27c(案内部を構成する溝)を有する。   Secondary transfer in which the in-belt drive roller 5 (first rotating body) and the secondary transfer roller 6 (second rotating body) are separated at both ends of the shaft 5 b (rotational axis) of the in-belt drive roller 5 Spacer members 27A and 27B (regulating members) are disposed. The secondary transfer / separating members 27A and 27B are annular members, and have an inclined surface 27a (force receiving portion) on the inner peripheral surface facing the shaft 5b of the in-belt drive roller 5. Further, the secondary transfer / separating members 27A and 27B have an outer peripheral surface 27b in contact with the secondary transfer bearing members 24A and 24B, and an engagement groove 27c engaged with the secondary transfer bearing members 24A and 24B on the outer peripheral surface (guide (A groove that constitutes a part).

ベルト内駆動ローラ5の軸5bの端部には、ベルト内駆動ローラ5と係合し、外周面が二次転写離間部材27A、27Bの内周面と接触する環状の離間補助部材28A,28Bがある。すなわち、ベルト内駆動ローラ5の軸5bの端部の外側に離間補助部材28A,28Bが取り付けられ、その外側に二次転写離間部材27A、27Bが離間補助部材28A,28Bと同心的に取り付けられている。離間補助部材28A,28Bの外周面には二次転写離間部材27A、27Bと接触する離間部材押出部28a(力付与部)が設けられている。二次転写軸受け部材24A、24Bには、それぞれ、二次転写ローラ6の軸を回転可能に軸支する軸受け部24aと、離間部材係合部24b(案内部を構成する凸部)が設けられている。   The end of the shaft 5b of the in-belt drive roller 5 is engaged with the in-belt drive roller 5, and the annular separation assisting member 28A, 28B whose outer peripheral surface is in contact with the inner peripheral surface of the secondary transfer separating members 27A, 27B. There is. That is, the separation assisting members 28A and 28B are attached to the outside of the end of the shaft 5b of the in-belt driving roller 5, and the secondary transfer separating members 27A and 27B are concentrically attached to the separation assisting members 28A and 28B on the outside thereof. ing. On the outer peripheral surface of the separation assisting members 28A and 28B, a separation member pushing portion 28a (force applying portion) in contact with the secondary transfer separation members 27A and 27B is provided. Each of the secondary transfer bearing members 24A and 24B is provided with a bearing portion 24a for rotatably supporting the shaft of the secondary transfer roller 6 and a separation member engaging portion 24b (a convex portion constituting a guide portion). ing.

離間時には、二次転写離間部材27A、27Bの外周面27bと一次転写軸受け部材24A、24Bの離間部材係合部24bが接触することで、ベルト内駆動ローラ5と二次転写ローラ6及び中間転写ベルト11を離間させることができる。本構成であれば、離間部材係合部24bの長さ(高さ)を変えることで離間量の調整もでき、かつギアのように全周に広いスペースも必要としない。   At the time of separation, the in-belt driving roller 5, the secondary transfer roller 6, and the intermediate transfer are brought into contact by the outer peripheral surface 27b of the secondary transfer and separation members 27A and 27B and the separation member engaging portion 24b of the primary transfer bearing members 24A and 24B contacting each other. The belt 11 can be separated. With this configuration, the amount of separation can be adjusted by changing the length (height) of the separation member engaging portion 24b, and a large space is not required around the entire circumference as in a gear.

次に自動当接動作について、説明する。自動当接動作とは、図6のようにベルト内駆動ローラ5が二次転写ローラ6と離間している状態から、図7のような二次転写が可能となる状態までの動作のことである。モータなどの駆動体から力を受けてベルト内駆動ローラ5が回転すると、軸5bの端部に取り付けている離間補助部材28A,28B及び二次転写離間部材27A、27Bも連れまわって回転する。二次転写離間部材27A、27Bが回転すると、係合溝27cに二次転写軸受け部材24A、24Bの離間部材係合部24bが嵌る。係合部24bが係合溝27cに嵌ることで二次転写離間部材27A、27Bの回転は制止される。ベルト内駆動ローラ5及び離間補助部材28A,28Bは駆動体から力を受け回転し続けているので、回転方向に係止された二次転写離間部材27A、27Bは離間部材押出部28aから斜面部27aに力を受けて、軸方向に移動を開始する。この移動により、二次転写離間部材27A、27Bと二次転写軸受け部材24A、24Bの係合が軸方向で外れ、ベルト内駆動ローラ5と二次転写ローラ19が当接する。   Next, the automatic contact operation will be described. The automatic contact operation is an operation from the state where the in-belt drive roller 5 is separated from the secondary transfer roller 6 as shown in FIG. 6 to the state where the secondary transfer becomes possible as shown in FIG. is there. When the in-belt drive roller 5 is rotated by receiving a force from a driving body such as a motor, the separation assisting members 28A and 28B and the secondary transfer separation members 27A and 27B attached to the end of the shaft 5b are also rotated. When the secondary transfer and separation members 27A and 27B rotate, the separation member engaging portion 24b of the secondary transfer bearing members 24A and 24B is fitted in the engagement groove 27c. The engagement of the engagement portion 24b with the engagement groove 27c prevents the rotation of the secondary transfer / separation members 27A and 27B. Since the in-belt drive roller 5 and the separation assisting members 28A and 28B continue to rotate by receiving a force from the driving body, the secondary transfer separating members 27A and 27B locked in the rotational direction are inclined portions from the separation member pushing portion 28a. Under the force of 27a, it starts to move in the axial direction. By this movement, the engagement between the secondary transfer / separating members 27A and 27B and the secondary transfer bearing members 24A and 24B is disengaged in the axial direction, and the in-belt drive roller 5 and the secondary transfer roller 19 abut.

なお、二次転写離間部材27A、27Bは、軸方向で二次転写軸受け部材24A、24Bから外れたのちは、ベルト内駆動ローラ5と連れまわって回転し続け、二次転写やベルト内駆動ローラ5の回転に対する邪魔にはならない。また、逆に当接状態から離間状態にする際は、二次転写離間部材27A,27Bを手動で軸方向に移動させ、二次転写軸受け部材24A、24Bと当接するポジションに移動させることで、二次転写ニップの離間状態を作り出すことができる。   After the secondary transfer and separation members 27A and 27B are separated from the secondary transfer bearing members 24A and 24B in the axial direction, the secondary transfer and separation members 27A and 27B continue to rotate together with the in-belt drive roller 5, and the secondary transfer and in-belt drive rollers are continued. Do not disturb the rotation of 5. Conversely, when changing from the contact state to the separated state, the secondary transfer and separation members 27A and 27B are manually moved in the axial direction and moved to positions in contact with the secondary transfer bearing members 24A and 24B, A separation of the secondary transfer nip can be created.

<実施例3>
図8、図9を参照して、本発明の実施例3に係る間隔調整機構及び画像形成装置について説明する。ここでは、実施例1、2と同様の構成については、同符号を付して説明を省略する。ここで特に説明しない事項については実施例1、2と同様である。
Example 3
A space adjusting mechanism and an image forming apparatus according to a third embodiment of the present invention will be described with reference to FIGS. 8 and 9. Here, the same components as those of the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. Matters that are not particularly described here are the same as in the first and second embodiments.

(現像部の離間構成)
図8、図9を参照して、現像部の離間構成(間隔調整機構)について説明する。
図8は、現像ローラ9を感光ドラム7から離間させた状態(第1位置)を説明する模式図であり、(a)は全体図、(b)は(a)の一部を拡大した詳細図、(c)は(b)のEE断面図である。図9は、現像ローラ9を感光ドラム7に当接させた状態(第2位置)を説明する模式図であり、(a)は全体図、(b)は(a)の一部を拡大した詳細図、(c)は(b)のFF断面図である。画像形成装置の出荷時には、図8に示すような、現像ローラ9と感光ドラム7を離間させる構成をとり、画像印刷時には、図9に示すような、現像ローラ9と感光ドラム7を当接させる構成をとる。
(Separating configuration of developing unit)
With reference to FIG. 8 and FIG. 9, the separation configuration (space adjustment mechanism) of the developing unit will be described.
FIG. 8 is a schematic view for explaining a state (first position) in which the developing roller 9 is separated from the photosensitive drum 7, (a) is an overall view, (b) is an enlarged detail of (a) The figure, (c) is EE sectional drawing of (b). FIG. 9 is a schematic view for explaining a state (second position) in which the developing roller 9 is in contact with the photosensitive drum 7, (a) is a general view, and (b) is an enlarged view of a part of (a). A detailed view and (c) are FF sectional views of (b). At the time of shipment of the image forming apparatus, the developing roller 9 and the photosensitive drum 7 are separated as shown in FIG. 8, and at the time of image printing, the developing roller 9 and the photosensitive drum 7 are abutted as shown in FIG. Take a configuration.

まず、現像ローラ9は感光体7に現像ばね部材29A、29B(付勢部材)によって押圧されている。感光体7の軸7b(回転軸)の両端部には、感光体7(第1の回転体)と現像ローラ9(第2の回転体)の離間を行う現像離間部材30A、30B(規制部材)が配置されている。現像離間部材30A、30Bは、環状部材であり、感光体7の軸7bと接触する内周面に斜面部30a(力受け部)を有する。また、現像離間部材30A、30Bは、現像ローラ軸受け部材31A、31Bと接触する外周面30bと、外周面上に現像ローラ軸受け部材31A、31Bと係合する係合溝30c(案内部を構成する溝)を有する。   First, the developing roller 9 is pressed against the photosensitive member 7 by the developing spring members 29A and 29B (biasing members). Development separating members 30A and 30B (regulating members) for separating the photosensitive member 7 (first rotating member) from the developing roller 9 (second rotating member) at both ends of the shaft 7b (rotating shaft) of the photosensitive member 7 ) Are arranged. The developing and spacing members 30A and 30B are annular members, and have an inclined surface 30a (force receiving portion) on the inner peripheral surface in contact with the shaft 7b of the photosensitive member 7. Further, the developing / separating members 30A and 30B have an outer peripheral surface 30b in contact with the developing roller bearing members 31A and 31B, and an engaging groove 30c on the outer peripheral surface to engage with the developing roller bearing members 31A and 31B Groove).

感光体7の軸7bの端部には、現像離間部材30A、30Bと接触する離間部材押出部7a(力付与部)が設けられている。現像ローラ軸受け部材31A、31Bには、それぞれ、現像ローラ9の軸を回転可能に軸支する軸受け部31aと、離間部材係合部31b(案内部を構成する凸部)がある。   At the end of the shaft 7b of the photosensitive member 7, a separating member pushing portion 7a (force applying portion) in contact with the development separating members 30A and 30B is provided. The developing roller bearing members 31A and 31B respectively include a bearing portion 31a for rotatably supporting the shaft of the developing roller 9 and a separation member engaging portion 31b (a convex portion forming a guide portion).

離間時には、現像離間部材30A、30Bの外周面30bと現像ローラ軸受け部材31
A、31Bの離間部材係合部31bが接触することで、感光体7と現像ローラ9を離間させることができる。本構成であれば、離間部材係合部31bの長さ(高さ)を変えることで離間量の調整もでき、かつギアのように全周に広いスペースも必要としない。
At the time of separation, the outer peripheral surface 30b of the development separation members 30A and 30B and the development roller bearing member 31
The photosensitive member 7 and the developing roller 9 can be separated by contacting the separating member engaging portions 31b of A and 31B. With this configuration, the separation amount can be adjusted by changing the length (height) of the separation member engaging portion 31b, and a large space is not required around the entire circumference as in a gear.

次に自動当接動作について、説明する。自動当接動作とは、図8のように感光体7が現像ローラ9と離間している状態から、図9のような現像が可能となる状態までの動作のことである。モータなどの駆動体から力を受けて感光体7が回転すると、軸7bの端部に取り付けている現像離間部材30A、30Bも連れまわって回転する。現像離間部材30A、30Bが回転すると、係合溝30cに現像ローラ軸受け部材31A、31Bの離間部材係合部31bが嵌る。係合部31bが係合溝30cに嵌ることで現像離間部材30A、30Bの回転は制止される。感光体7は駆動体から力を受け回転し続けているので、回転方向に係止された現像離間部材30A、30Bは離間部材押出部7aから斜面部30aに力を受けて、軸方向に移動を開始する。この移動により、現像離間部材30A、30Bと現像ローラ軸受け部材31A、31Bの係合が軸方向で外れ、感光体7と現像ローラ9が当接する。   Next, the automatic contact operation will be described. The automatic contact operation is an operation from the state where the photosensitive member 7 is separated from the developing roller 9 as shown in FIG. 8 to the state where the development as shown in FIG. 9 is possible. When the photosensitive member 7 is rotated by receiving a force from a driving body such as a motor, the developing and spacing members 30A and 30B attached to the end of the shaft 7b are also rotated together. When the developing and spacing members 30A and 30B rotate, the spacing member engaging portions 31b of the developing roller bearing members 31A and 31B are fitted in the engagement grooves 30c. The engagement of the engaging portion 31b with the engaging groove 30c prevents the development separating members 30A and 30B from rotating. Since the photosensitive member 7 continues to receive force from the driving member and continues to rotate, the development separating members 30A and 30B locked in the rotational direction receive the force from the separating member pushing portion 7a to the slope portion 30a and move in the axial direction To start. By this movement, the engagement between the developing / separating members 30A, 30B and the developing roller bearing members 31A, 31B is disengaged in the axial direction, and the photosensitive member 7 and the developing roller 9 abut.

なお、現像離間部材30A、30Bは、軸方向で現像ローラ軸受け部材31A、31Bから外れたのち、感光体7と連れまわって回転し続け、現像や感光体の回転に対する邪魔にはならない。また、逆に当接状態から離間状態にする際は、現像離間部材30A、30Bを手動で軸方向に移動させ、現像ローラ軸受け部材31A、31Bと当接するポジションに移動させることで、現像ニップの離間状態を作り出すことができる。   The developing and spacing members 30A and 30B are separated from the developing roller bearing members 31A and 31B in the axial direction, and continue to rotate together with the photosensitive member 7, and do not interfere with development or rotation of the photosensitive member. Conversely, when changing from the contact state to the separated state, the development separation members 30A and 30B are manually moved in the axial direction and moved to positions in contact with the development roller bearing members 31A and 31B. It can create a separation state.

<実施例4>
図10、図11を参照して、本発明の実施例4に係る間隔調整機構及び画像形成装置について説明する。ここでは、実施例1〜3と同様の構成については、同符号を付して説明を省略する。ここで特に説明しない事項については実施例1〜3と同様である。
Example 4
A space adjusting mechanism and an image forming apparatus according to a fourth embodiment of the present invention will be described with reference to FIGS. 10 and 11. Here, about the same composition as Examples 1-3, a same sign is attached and explanation is omitted. The items not particularly described here are the same as in the first to third embodiments.

(帯電部の離間構成)
図10、図11を参照して、帯電部の離間構成(間隔調整機構)について説明する。
図10は、帯電ローラ17を感光ドラム7から離間させた状態(第1位置)を説明する模式図であり、(a)は全体図、(b)は(a)の一部を拡大した詳細図、(c)は(b)のGG断面図である。図11は、帯電ローラ17を感光ドラム7に当接させた状態(第2位置)を説明する模式図であり、(a)は全体図、(b)は(a)の一部を拡大した詳細図、(c)は(b)のHH断面図である。画像形成装置の出荷時には、図10に示すような、帯電ローラ17と感光ドラム7を離間させる構成をとり、画像印刷時には、図11に示すような、帯電ローラ17と感光ドラム7を当接させる構成をとる。
(Separation configuration of charging unit)
With reference to FIG. 10 and FIG. 11, the separation configuration (space adjustment mechanism) of the charging unit will be described.
FIG. 10 is a schematic view for explaining the state (first position) in which the charging roller 17 is separated from the photosensitive drum 7, (a) is an overall view, (b) is an enlarged detail of (a) The figure, (c) is a GG sectional view of (b). FIG. 11 is a schematic view for explaining the state (second position) in which the charging roller 17 is in contact with the photosensitive drum 7. (a) is an overall view, and (b) is an enlarged view of (a) A detailed view and (c) are HH sectional views of (b). At the time of shipment of the image forming apparatus, the charging roller 17 and the photosensitive drum 7 are separated as shown in FIG. 10, and at the time of image printing, the charging roller 17 and the photosensitive drum 7 are abutted as shown in FIG. Take a configuration.

まず、帯電ローラ17は感光体7に帯電ばね部材32A、32B(付勢部材)によって押圧されている。感光体7の軸7b(回転軸)の両端部には、感光体7(第1の回転体)と帯電ローラ17(第2の回転体)の離間を行う帯電離間部材33A、33B(規制部材)が配置されている。帯電離間部材33A、33Bは、環状部材であり、感光体7の軸7bと接触する内周面に斜面部33a(力受け部)を有する。また、帯電離間部材33A、33Bは、帯電ローラ軸受け部材34A、34Bと接触する外周面33bと、外周面上に帯電ローラ軸受け部材34A、34Bと係合する係合溝33c(案内部を構成する溝)を持つ。   First, the charging roller 17 is pressed against the photosensitive member 7 by the charging spring members 32A and 32B (biasing member). At both ends of the shaft 7b (rotational shaft) of the photosensitive member 7, charging separating members 33A and 33B (regulating members) for separating the photosensitive member 7 (first rotating member) from the charging roller 17 (second rotating member) ) Are arranged. The charging / separating members 33A and 33B are annular members, and have an inclined surface portion 33a (force receiving portion) on the inner peripheral surface in contact with the shaft 7b of the photosensitive member 7. Further, the charging separation members 33A and 33B have an outer peripheral surface 33b in contact with the charging roller bearing members 34A and 34B, and an engagement groove 33c on the outer peripheral surface that engages with the charging roller bearing members 34A and 34B. Groove).

感光体7の軸7bの端部には、帯電離間部材33A、33Bと接触する離間部材押出部7a(力付与部)が設けられている。帯電ローラ軸受け部材34A、34Bには、それぞれ、帯電ローラ17の軸を回転可能に軸支する軸受け部34aと、離間部材係合部34b(案内部を構成する凸部)がある。   At the end of the shaft 7b of the photosensitive member 7, a separating member pushing portion 7a (force applying portion) in contact with the charging and spacing members 33A and 33B is provided. The charging roller bearing members 34A and 34B respectively have a bearing portion 34a for rotatably supporting the shaft of the charging roller 17 and a separation member engaging portion 34b (a convex portion constituting a guide portion).

離間時には、帯電離間部材33A、33Bの外周面33bと帯電ローラ軸受け部材34A、34Bの離間部材係合部34bが接触することで、感光体7と帯電ローラ17を離間させることができる。本構成であれば、離間部材係合部34bの長さ(高さ)を変えることで離間量の調整もでき、かつギアのように全周に広いスペースも必要としない。   At the time of separation, the photosensitive member 7 and the charging roller 17 can be separated by bringing the outer peripheral surface 33b of the charging and spacing members 33A and 33B into contact with the separating member engaging portion 34b of the charging roller bearing members 34A and 34B. With this configuration, the amount of separation can be adjusted by changing the length (height) of the separation member engaging portion 34b, and a large space is not required around the entire circumference like a gear.

次に自動当接動作について、説明する。自動当接動作とは、図10のように感光体7が帯電ローラ17と離間している状態から、図11のような帯電が可能となる状態までの動作のことである。モータなどの駆動体から力を受けて感光体7が回転すると、軸7bの端部に取り付けている帯電離間部材33A、33Bも連れまわって回転する。帯電離間部材33A、33Bが回転すると、係合溝33cに帯電ローラ軸受け部材34A、34Bの離間部材係合部34bが嵌る。係合部34bが係合溝33cに嵌ることで帯電離間部材33A、33Bの回転は制止される。感光体7は駆動体から力を受け回転し続けているので、回転方向に係止された帯電離間部材33A、33Bは離間部材押出部7aから斜面部33aに力を受けて、軸方向に移動を開始する。この移動により、帯電離間部材33A、33Bと帯電ローラ軸受け部材34A、34Bの係合が軸方向で外れ、感光体7と帯電ローラ17が当接する。   Next, the automatic contact operation will be described. The automatic contact operation is an operation from the state where the photosensitive member 7 is separated from the charging roller 17 as shown in FIG. 10 to the state where charging as shown in FIG. 11 is possible. When the photosensitive member 7 is rotated by receiving a force from a driving body such as a motor, the charging and spacing members 33A and 33B attached to the end of the shaft 7b are also rotated. When the charging and spacing members 33A and 33B rotate, the spacing member engaging portions 34b of the charging roller bearing members 34A and 34B are fitted into the engagement grooves 33c. The rotation of the charging / separating members 33A and 33B is restrained by the engagement portion 34b being fitted in the engagement groove 33c. Since the photosensitive member 7 continues to receive force from the driving member and continues to rotate, the charge separating members 33A and 33B locked in the rotational direction receive the force from the separating member pushing portion 7a to the slope portion 33a and move in the axial direction To start. By this movement, the engagement of the charging / separating members 33A, 33B and the charging roller bearing members 34A, 34B is disengaged in the axial direction, and the photosensitive member 7 and the charging roller 17 abut.

なお、帯電離間部材33A、33Bは、軸方向で帯電ローラ軸受け部材34A、34Bから外れたのち、感光体7と連れまわって回転し続け、現像や感光体の回転に対する邪魔にはならない。また、逆に当接状態から離間状態にする際は、帯電離間部材33A、33Bを手動で軸方向に移動させ、帯電ローラ軸受け部材34A、34Bと当接するポジションに移動させることで、帯電ニップの離間状態を作り出すことができる。   The charging separation members 33A and 33B are separated from the charging roller bearing members 34A and 34B in the axial direction, and continue to rotate together with the photosensitive member 7, and do not interfere with development or rotation of the photosensitive member. Conversely, when changing from the contact state to the separated state, the charging separation members 33A and 33B are manually moved in the axial direction and moved to positions in contact with the charging roller bearing members 34A and 34B, thereby It can create a separation state.

なお、上記各実施例は可能な限り互いに組み合わせた構成を採用することができる。また、記録材を搬送ベルトにより搬送する構成を備えた画像形成装置においても、搬送ベルトを介して互いに圧接される2つの回転体の当接離間機構に本発明は適用可能である。   In addition, the said each Example can employ | adopt the structure mutually combined as much as possible. Further, even in an image forming apparatus having a configuration in which the recording material is transported by the transport belt, the present invention is applicable to the contact / separation mechanism of the two rotating members pressed against each other via the transport belt.

7…感光ドラム(第1の回転体)、7a…離間部材押出部(力付与部)、7b…軸(回転軸)、19…一次転写ローラ(第2の回転体)、20A、20B…一次転写軸受け部材(対向部材、支持部材)、20b…離間部材係合部(案内部を構成する凸部)、21A、21B…一次転写ばね部材(付勢部材)、23A、23B…一次転写離間部材(規制部材)、23a…斜面部(力受け部)、23c…係合溝(案内部を構成する溝)   7 Photosensitive drum (first rotating body) 7a Separation member pushing portion (force applying portion) 7b Axis (rotational axis) 19 Primary transfer roller (second rotating body) 20A, 20B Primary Transfer bearing member (opposite member, support member), 20b: separating member engaging portion (convex portion constituting guide portion) 21A, 21B: primary transfer spring member (biasing member), 23A, 23B: primary transfer separating member (Restricting member), 23a: sloped portion (force receiving portion), 23c: engagement groove (groove constituting guide portion)

Claims (17)

画像形成装置において、回転軸と、該回転軸に対向配置される対向部材と、の間隔を調整する間隔調整機構であって、
前記対向部材を前記回転軸に向かって付勢する付勢部と、
前記間隔を規制する規制部材であって、前記回転軸の外周面上を移動可能に前記回転軸に取り付けられ、回転する前記回転軸から前記外周面上を移動する力を受ける力受け部を有し、前記回転軸の回転によって、前記間隔が所定の間隔となるように前記付勢部の付勢力に作用する第1位置から、前記第1位置に対して前記回転軸の軸線方向に異なる位置であって、前記付勢力に対する作用の仕方が前記第1位置のときとは変化する第2位置へ移動可能に構成された規制部材と、
を備えることを特徴とする間隔調整機構。
An image forming apparatus, comprising: an interval adjusting mechanism for adjusting an interval between a rotation axis and an opposing member disposed opposite to the rotation axis,
A biasing portion for biasing the opposing member toward the rotation axis;
The restricting member restricts the gap, and has a force receiving portion attached to the rotating shaft so as to be movable on the outer peripheral surface of the rotating shaft and receiving a force to move the outer peripheral surface from the rotating rotating shaft. And a position different from the first position in the axial direction of the rotation shaft with respect to the first position from the first position acting on the urging force of the urging portion such that the distance becomes a predetermined distance by the rotation of the rotation shaft. A restricting member configured to be movable to a second position where the manner of action on the biasing force is different from that at the first position;
A space adjusting mechanism characterized by comprising:
記録材に画像形成する画像形成装置であって、
回転軸を備える回転体と、
前記回転軸に対向配置される対向部材と、
前記対向部材を前記回転軸に向かって付勢する付勢部材と、
前記付勢部材の付勢方向における前記回転軸と前記対向部材の間隔を調整する間隔調整機構と、
を備え、
前記間隔調整機構は、前記間隔を規制する規制部材を有し、前記規制部材は、前記回転軸の外周面上を移動可能に前記回転軸に取り付けられ、回転する前記回転軸から前記外周面上を移動する力を受ける力受け部を有し、前記回転軸の回転によって前記間隔が所定の間隔となるように前記付勢部材の付勢力に作用する第1位置から、前記第1位置に対して前記回転軸の軸線方向に異なる位置であって、前記付勢力に対する作用の仕方が前記第1位置のときとは変化する第2位置へ移動可能に構成されたことを特徴とする画像形成装置。
An image forming apparatus for forming an image on a recording material
A rotating body having a rotating shaft,
An opposing member disposed opposite to the rotation axis;
An urging member for urging the opposing member toward the rotation axis;
An interval adjusting mechanism for adjusting an interval between the rotating shaft and the opposing member in the biasing direction of the biasing member;
Equipped with
The space adjusting mechanism has a restriction member for restricting the space, and the restriction member is attached to the rotation shaft so as to be movable on the outer peripheral surface of the rotation shaft, and rotates from the rotating shaft to the outer peripheral surface has a force receiving portion for receiving a force to move, by rotation of the rotary shaft, from a first position where the gap is applied to the biasing force of the pre-Symbol biasing member so as to have a predetermined interval, said first position The image is characterized in that it is configured to be movable to a second position which is different in the axial direction of the rotating shaft and in which the manner of action on the biasing force is different from that in the first position. Forming device.
前記第1位置は、前記規制部材が、前記間隔が所定の間隔となるように前記付勢力に抗する力を発揮する位置であり、
前記第2位置は、前記規制部材が、前記付勢力に抗する力を発揮しない位置であること
を特徴とする請求項2に記載の画像形成装置。
The first position is a position at which the restricting member exerts a force against the biasing force so that the distance becomes a predetermined distance,
The image forming apparatus according to claim 2, wherein the second position is a position where the restricting member does not exert a force against the biasing force.
前記第1位置は、前記規制部材が、前記回転軸と前記対向部材との間に挟まれる位置であり、
前記第2位置は、前記規制部材が、前記回転軸と前記対向部材との間に挟まれない位置であることを特徴とする請求項2または3に記載の画像形成装置。
The first position is a position at which the restriction member is sandwiched between the rotation shaft and the opposing member,
The image forming apparatus according to claim 2, wherein the second position is a position in which the restriction member is not sandwiched between the rotation shaft and the opposing member.
前記力受け部は、前記規制部材と前記回転軸との間の相対移動によって、前記回転軸に設けられた力付与部から軸線方向に作用する分力を含む力を受けるように構成されていることを特徴とする請求項2〜4のいずれか1項に記載の画像形成装置。   The force receiving portion is configured to receive a force including a component force acting in an axial direction from a force applying portion provided on the rotating shaft by relative movement between the regulating member and the rotating shaft. The image forming apparatus according to any one of claims 2 to 4, characterized in that: 前記力受け部は、前記外周面に対向する内周面上を周方向及び軸線方向に対して斜めに延びる面であり、
前記力付与部は、前記面と当接するように前記外周面上に設けられた突起であることを特徴とする請求項5に記載の画像形成装置。
The force receiving portion is a surface that obliquely extends with respect to the circumferential direction and the axial direction on the inner circumferential surface facing the outer circumferential surface,
The image forming apparatus according to claim 5, wherein the force applying unit is a protrusion provided on the outer peripheral surface to be in contact with the surface.
前記規制部材と前記回転軸との間の相対移動が生じるように前記規制部材の移動を規制して、前記規制部材を前記第1位置から前記第2位置へ案内する案内部をさらに備えることを特徴とする請求項3または4に記載の画像形成装置。   It further comprises a guiding part for restricting the movement of the restricting member so as to cause relative movement between the restricting member and the rotary shaft to guide the restricting member from the first position to the second position. The image forming apparatus according to claim 3, wherein the image forming apparatus is characterized by: 前記力受け部は、前記規制部材と前記回転軸との間の相対移動によって、前記回転軸に設けられた力付与部から軸線方向に作用する分力を含む力を受けるように構成されており、
前記案内部は、前記規制部材における前記回転軸の軸線回りの移動を規制する回り止め部を有し、
前記規制部材は、前記回り止め部によって前記軸線回りの移動が規制された状態で前記回転軸が回転することで前記相対移動が生じ、前記力受け部が前記力付与部から前記分力を含む力を受けることにより、前記外周面上を移動することを特徴とする請求項7に記載の画像形成装置。
The force receiving portion is configured to receive a force including a component force acting in an axial direction from a force applying portion provided on the rotating shaft by relative movement between the regulating member and the rotating shaft. ,
The guide portion has a rotation prevention portion that restricts movement of the restriction member around the axis of the rotation shaft,
The relative movement is caused by the rotation of the rotation shaft in a state where the movement around the axis is restricted by the detent portion, and the force receiving portion includes the component force from the force applying portion. The image forming apparatus according to claim 7, wherein the image forming apparatus moves on the outer peripheral surface by receiving a force.
前記力受け部は、前記規制部材と前記回転軸との間の相対移動によって、前記回転軸に設けられた力付与部から軸線方向に作用する分力を含む力を受けるように構成されており、
前記案内部は、前記規制部材に設けられた、前記軸線方向に延びる溝と、前記対向部材に設けられ、前記溝に嵌合可能な凸部と、で構成され、
前記規制部材は、前記凸部が前記溝に嵌合することにより、前記軸線方向の移動は許容されつつ前記軸線回りの移動が規制されることを特徴とする請求項7に記載の画像形成装置。
The force receiving portion is configured to receive a force including a component force acting in an axial direction from a force applying portion provided on the rotating shaft by relative movement between the regulating member and the rotating shaft. ,
The guide portion is configured by a groove extending in the axial direction provided in the restriction member, and a convex portion provided in the opposing member and capable of being fitted to the groove.
8. The image forming apparatus according to claim 7, wherein movement of the regulating member in the axial direction is restricted while movement in the axial direction is permitted by fitting the convex portion into the groove. .
前記溝の側壁は、前記規制部材における前記回転軸の軸線回りの移動を規制する回り止め部として機能し、
前記規制部材は、前記回り止め部によって前記軸線回りの移動が規制された状態で前記回転軸が回転することで前記相対移動が生じ、前記力受け部が前記力付与部から前記分力を含む力を受けることにより、前記外周面上を移動することを特徴とする請求項9に記載の画像形成装置。
The side wall of the groove functions as a rotation stopper that restricts movement of the restriction member around the axis of the rotation shaft,
The relative movement is caused by the rotation of the rotation shaft in a state where the movement around the axis is restricted by the detent portion, and the force receiving portion includes the component force from the force applying portion. The image forming apparatus according to claim 9, wherein the image forming apparatus moves on the outer peripheral surface by receiving a force.
前記規制部材が前記第1位置にあるときに、前記間隔は、第1間隔に規制され、
前記規制部材が前記第2位置にあるときに、前記間隔は、前記第1間隔よりも狭い第2間隔となることを特徴とする請求項2〜10のいずれか1項に記載の画像形成装置。
When the regulating member is in the first position, the spacing is regulated to a first spacing,
The image forming apparatus according to any one of claims 2 to 10, wherein when the restricting member is at the second position, the interval is a second interval narrower than the first interval. .
前記規制部材は、環状の部材であり、前記回転軸の外周面に回転可能に取り付けられていることを特徴とする請求項2〜11のいずれか1項に記載の画像形成装置。   The image forming apparatus according to any one of claims 2 to 11, wherein the restriction member is an annular member and is rotatably attached to an outer peripheral surface of the rotation shaft. 前記規制部材は、前記回転軸の端部に取り付けられており、
前記第1位置は、前記第2位置よりも前記回転軸の中央側であることを特徴とする請求項2〜12のいずれか1項に記載の画像形成装置。
The restriction member is attached to an end of the rotation shaft,
The image forming apparatus according to any one of claims 2 to 12, wherein the first position is closer to the center of the rotation shaft than the second position.
前記規制部材は、前記回転軸の両端部にそれぞれ取り付けられていることを特徴とする請求項2〜13のいずれか1項に記載の画像形成装置。   The image forming apparatus according to any one of claims 2 to 13, wherein the restriction member is attached to each end of the rotation shaft. 前記対向部材は、第2の回転体を回転可能に軸支する軸受け部材であり、第1の回転体としての前記回転軸に対して接離方向に移動可能に設けられており、
前記付勢部材は、前記接離方向において前記第2の回転体を前記第1の回転体に近づける方向に付勢する付勢部材を有することを特徴とする請求項2〜14のいずれか1項に記載の画像形成装置。
The opposing member is a bearing member for rotatably supporting the second rotating body, and is provided movably in the direction of contact and separation with respect to the rotating shaft as the first rotating body.
The biasing member according to any one of claims 2 to 14, wherein the biasing member includes a biasing member that biases the second rotary body in a direction to approach the first rotary body in the contact and separation direction. An image forming apparatus according to claim 1.
前記回転体は、トナー像を担持する像担持体であり、
前記対向部材は、
前記像担持体との間で記録材を挟持搬送して前記トナー像を前記記録材に転写するためのニップ部を形成するように、前記像担持体と接触する転写部材を支持する支持部材、
中間転写ベルトと前記像担持体との間に前記トナー像を前記像担持体から前記中間転写ベルトへ転写するためのニップ部を形成するように、前記中間転写ベルトを介して前記像担持体に当接する転写部材を支持する支持部材、
記録材を搬送する搬送ベルトと前記像担持体との間に前記トナー像を前記像担持体から前記記録材へ転写するためのニップ部を形成するように、前記搬送ベルトを介して前記像担持体に当接する転写部材を支持する支持部材、
のいずれかであることを特徴とする請求項2〜15のいずれか1項に記載の画像形成装置。
The rotating body is an image carrier that carries a toner image,
The opposing member is
A supporting member for supporting a transfer member in contact with the image carrier so as to form a nip portion for transferring the recording material to the image carrier by nipping and conveying the recording material with the image carrier;
The image carrier is provided with an intermediate transfer belt so as to form a nip for transferring the toner image from the image carrier to the intermediate transfer belt between the intermediate transfer belt and the image carrier. A support member for supporting the transfer member in contact
The image carrying member carries the image through the carrying belt so as to form a nip for transferring the toner image from the image carrying member to the recording material between the carrying belt for carrying the recording material and the image carrier. A support member for supporting the transfer member in contact with the body,
The image forming apparatus according to any one of claims 2 to 15, which is any one of the above.
前記回転体は、トナー像を担持するベルトを張架するローラであり、
前記対向部材は、前記ベルトとの間で記録材を挟持搬送して前記トナー像を前記記録材に転写するためのニップ部を形成するように、前記ベルトを介して前記ローラに当接する転写部材を支持する支持部材であることを特徴とする請求項2〜15のいずれか1項に記載の画像形成装置。
The rotating body is a roller for stretching a belt carrying a toner image,
The opposing member is in contact with the roller via the belt so as to form a nip portion for nipping and conveying the recording material with the belt to transfer the toner image to the recording material. The image forming apparatus according to any one of claims 2 to 15, wherein the image forming apparatus is a support member for supporting the image forming apparatus.
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