JP4910659B2 - Image forming apparatus - Google Patents
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- JP4910659B2 JP4910659B2 JP2006321509A JP2006321509A JP4910659B2 JP 4910659 B2 JP4910659 B2 JP 4910659B2 JP 2006321509 A JP2006321509 A JP 2006321509A JP 2006321509 A JP2006321509 A JP 2006321509A JP 4910659 B2 JP4910659 B2 JP 4910659B2
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Description
本発明は、複写機、プリンタ、ファクシミリ機又はこれらのうち2以上を組み合わせた複合機等の画像形成装置に関する。 The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile machine, or a multi-function machine combining two or more of these.
複写機、プリンタ、ファクシミリ機又はこれらのうち2以上を組み合わせた複合機等の画像形成装置の代表的なものとして、トナー像が形成される像担持体と、該像担持体に圧接されて該像担持体との間にニップ部を形成し、該ニップ部に記録媒体を通過させて該像担持体上のトナー像を該記録媒体に転写する転写部材とを含む画像形成装置がある。 As a typical image forming apparatus such as a copying machine, a printer, a facsimile machine, or a combination machine combining two or more of these, an image carrier on which a toner image is formed, and an image carrier that is in pressure contact with the image carrier There is an image forming apparatus including a transfer member that forms a nip portion with an image carrier and passes a recording medium through the nip portion to transfer a toner image on the image carrier to the recording medium.
この種の画像形成装置では、記録媒体詰まり、未定着トナー像の他部品との接触による画像擦れ等を抑制するために、前記ニップ部から排出される記録媒体が次の処理部(通常はトナー像を記録媒体に定着させる定着装置)へできるだけ円滑に向かうように該記録媒体を像担持体から分離させるための除電部材や像担持体に貼り付いた場合の記録媒体を像担持体から剥がすための分離爪を設けることが提案されてきた。 In this type of image forming apparatus, in order to suppress clogging of the recording medium and image rubbing due to contact with other parts of the unfixed toner image, the recording medium discharged from the nip portion is the next processing unit (usually a toner). To remove the recording medium from the image carrier when it is attached to the charge-removing member or the image carrier for separating the recording medium from the image carrier so as to go as smoothly as possible to a fixing device for fixing the image to the recording medium) It has been proposed to provide a separate nail.
ところが除電部材や分離爪を設けるだけでは、記録媒体の像担持体からの分離性が十分でない事態が発生することがある。 However, a situation in which the separation property of the recording medium from the image carrier is not sufficient only by providing the charge eliminating member and the separation claw may occur.
そのため、像担持体と転写部材とのニップ部から排出されてくる記録媒体に像担持体側から空気を吹きつけて像担持体からの分離性を向上させることも提案されてきた。このような空気の吹きつけは、例えば特開2006−18074号公報、特開2003−195586号公報、特開昭59−40672号公報等多くの文献に記載されている。 For this reason, it has also been proposed to improve the separation from the image carrier by blowing air from the image carrier side to the recording medium discharged from the nip portion between the image carrier and the transfer member. Such air blowing is described in many documents such as Japanese Patent Application Laid-Open Nos. 2006-18074, 2003-195586, and 59-40672.
しかしながら、像担持体と転写部材とのニップ部から排出されてくる記録媒体に像担持体側から空気を吹きつけて像担持体からの分離性を向上させようとする分離手法によると、記録媒体のトナー像が転写された面に向け空気を吹きつけることになるので、未定着トナー像が乱れ、画像不良が生じる恐れがある。 However, according to the separation method in which air is blown from the image carrier side to the recording medium discharged from the nip portion between the image carrier and the transfer member, the separation from the image carrier is improved. Since air is blown toward the surface onto which the toner image has been transferred, the unfixed toner image may be disturbed and image defects may occur.
そこで本発明は、トナー像が形成される像担持体と、該像担持体に圧接されて該像担持体との間にニップ部を形成し、該ニップ部に記録媒体を通過させて該像担持体上のトナー像を該記録媒体に転写する転写部材とを含む画像形成装置であって、該ニップ部から排出されてくる記録媒体の像担持体からの分離性を、未定着トナー像の乱れを招くことなく向上させることができる画像形成装置を提供することを課題とする。 Therefore, the present invention provides an image carrier on which a toner image is formed and a nip portion formed between the image carrier and the image carrier, and a recording medium is passed through the nip portion to pass the image. An image forming apparatus including a transfer member for transferring a toner image on a carrier to the recording medium, wherein the separation property of the recording medium discharged from the nip portion from the image carrier is determined for the unfixed toner image. It is an object of the present invention to provide an image forming apparatus that can be improved without causing disturbance.
前記課題を解決するため本発明は、
トナー像が形成される像担持体と、
該像担持体に圧接されて該像担持体との間にニップ部を形成し、該ニップ部に記録媒体を通過させて該像担持体上のトナー像を該記録媒体に転写する転写部材とを含む画像形成装置であり、
記録媒体搬送方向において前記ニップ部より下流側領域で前記転写部材を覆って該転写部材を保持する転写部材ホルダと、
該転写部材ホルダを前記転写部材とは反対側から間隔をおいて覆うとともに、記録媒体搬送方向において該転写部材ホルダより下流側に記録媒体ガイド部を有している外殻部材と、
前記転写部材とは反対側の該外殻部材の背後において該外殻部材に連設された吸気装置とを含んでおり、
前記外殻部材には該外殻部材と前記転写部材ホルダとの間の空間を前記吸気装置へ連通させる通気口が形成されており、
前記記録媒体ガイド部は前記転写部材ホルダの前記像担持体側の端部との間に吸気口を提供するように配置されており、
前記吸気装置により前記吸気口から前記外殻部材と前記転写部材ホルダとの間の空間及び前記通気口を介して吸気して前記ニップ部から排出されてくる記録媒体に前記転写部材ホルダ側への吸引力を作用させることができる画像形成装置を提供する。
In order to solve the above problems, the present invention provides:
An image carrier on which a toner image is formed;
A transfer member that is pressed against the image carrier to form a nip portion with the image carrier, and passes a recording medium through the nip portion to transfer a toner image on the image carrier to the recording medium; An image forming apparatus including
A transfer member holder that covers the transfer member in a region downstream of the nip portion in the recording medium conveyance direction and holds the transfer member;
An outer shell member that covers the transfer member holder at a distance from the side opposite to the transfer member and has a recording medium guide portion on the downstream side of the transfer member holder in the recording medium conveyance direction;
An air intake device connected to the outer shell member behind the outer shell member on the side opposite to the transfer member;
The outer shell member is formed with a vent for communicating a space between the outer shell member and the transfer member holder to the intake device,
The recording medium guide portion is disposed so as to provide an air inlet between the transfer member holder and the end portion on the image carrier side of the transfer member holder,
The recording medium that is sucked from the suction port by the suction device through the air gap through the space between the outer shell member and the transfer member holder and discharged from the nip portion to the transfer member holder side. An image forming apparatus capable of applying a suction force is provided.
本発明に係る画像形成装置はモノクロ画像形成装置でもカラー画像形成装置でもよい。 また、モノクロ画像形成装置であれ、カラー画像形成装置であれ、感光体等の静電潜像担持体から該像担持体上に形成されるトナー像を直接記録媒体に転写し、定着させる画像形成装置でも、感光体等の静電潜像担持体から中間転写ベルト等の中間転写体(像担持体の1種)上へトナー像を1次転写し、中間転写体から記録媒体へ1次転写トナー像を2次転写し、定着させる画像形成装置でもよい。 The image forming apparatus according to the present invention may be a monochrome image forming apparatus or a color image forming apparatus. In addition, whether it is a monochrome image forming apparatus or a color image forming apparatus, the toner image formed on the image carrier from the electrostatic latent image carrier such as a photoreceptor is directly transferred to a recording medium and fixed. Even in the apparatus, a toner image is primarily transferred from an electrostatic latent image carrier such as a photosensitive member onto an intermediate transfer member (one type of image carrier) such as an intermediate transfer belt, and then primary transferred from the intermediate transfer member to a recording medium. An image forming apparatus that secondarily transfers and fixes the toner image may be used.
本発明に係る画像形成装置における前記の「トナー像が形成される像担持体」とは、そこから転写部材により記録媒体にトナー像が転写される像担持体である。例えば、感光体等の像担持体から直接記録媒体にトナー像を転写し、定着させる画像形成装置にあっては、該感光体等の像担持体であり、感光体等の静電潜像担持体から中間転写ベルト等の中間転写体上へトナー像を1次転写し、中間転写体から記録媒体へ1次転写トナー像を2次転写し、定着させる画像形成装置にあっては該中間転写体である。 The “image carrier on which a toner image is formed” in the image forming apparatus according to the present invention is an image carrier from which a toner image is transferred onto a recording medium by a transfer member. For example, in an image forming apparatus for transferring and fixing a toner image directly from an image carrier such as a photoconductor to a recording medium, the image carrier such as the photoconductor is an electrostatic latent image carrier such as a photoconductor. In an image forming apparatus in which a toner image is primarily transferred onto an intermediate transfer member such as an intermediate transfer belt and the primary transfer toner image is secondarily transferred from the intermediate transfer member to a recording medium and fixed. Is the body.
本発明に係る画像形成装置における前記の「転写部材」としては、代表例として転写ローラを上げることができるが、複数のプーリに巻き掛けられた無端転写ベルト等でもよい。 As the “transfer member” in the image forming apparatus according to the present invention, a transfer roller can be raised as a representative example, but an endless transfer belt wound around a plurality of pulleys may be used.
いずれにしても、本発明に係る画像形成装置によると、像担持体と転写部材とのニップ部から排出されてくる記録媒体(記録紙等)を像担持体から分離させる記録媒体分離領域に転写部材ホルダの像担持体側端部と転写部材ホルダを覆っている外殻部材の記録媒体ガイド部との間に提供された吸気口が臨んでいる。 In any case, according to the image forming apparatus of the present invention, the recording medium (recording paper or the like) discharged from the nip portion between the image carrier and the transfer member is transferred to the recording medium separation region that separates the image carrier from the image carrier. An air inlet provided between the image carrier side end of the member holder and the recording medium guide portion of the outer shell member covering the transfer member holder faces.
そして、外殻部材背後に連設された吸気装置の運転により、該吸気口から外殻部材と転写部材ホルダ間の空間及び外殻部材の通気口を介して吸気できる。それにより記録媒体のトナー像転写面とは反対側の面に、未定着の転写トナー像を乱すことなく吸引力を作用させて該記録媒体を像担持体から分離させ、記録媒体ガイド部の上流側に位置する転写部材ホルダ側へ引き寄せることができ、ひき続き円滑に該記録媒体ガイド部にて次の処理部(通常は定着装置)へ搬送することができる。 Then, by operating the air intake device connected to the back of the outer shell member, air can be sucked from the air inlet through the space between the outer shell member and the transfer member holder and the vent of the outer shell member. As a result, the recording medium is separated from the image carrier by applying a suction force to the surface of the recording medium opposite to the toner image transfer surface without disturbing the unfixed transfer toner image, and upstream of the recording medium guide section. Can be drawn toward the transfer member holder located on the side, and can be smoothly and smoothly conveyed to the next processing section (usually a fixing device) by the recording medium guide section.
本発明に係る画像形成装置においては、前記吸気口からより強く吸気して記録媒体の像担持体からの分離性を一層向上させるために、前記外殻部材と前記転写部材ホルダ間の空間に、且つ、該空間における前記吸気装置による吸気流の方向において該外殻部材の通気口より下流側に、少なくとも前記像担持体に前記転写部材が圧接されている状態において該吸気流を該通気口へ向かわせるように該空間を埋める通気遮断部材を配置してもよい。 In the image forming apparatus according to the present invention, in order to further improve the separation of the recording medium from the image carrier by sucking stronger from the air inlet, in the space between the outer shell member and the transfer member holder, In addition, at least in the state where the transfer member is in pressure contact with the image carrier on the downstream side of the vent of the outer shell member in the direction of the intake flow by the intake device in the space, the intake flow is directed to the vent. You may arrange | position the ventilation blocker which fills this space so that it may face.
前記転写部材ホルダは前記転写部材を前記像担持体に対し圧接離隔できる可動ホルダとしてもよい。例えば、転写部材ホルダとして前記外殻部材上の支点を中心に揺動駆動されるホルダを挙げることができる。さらに言えば、該外殻部材に設けた軸を中心に揺動可能のアームに支持され、該アームがソレノイド等の駆動部により揺動駆動されることで転写部材を像担持体に圧接させたり、像担持体から離隔させたりできるものを例示できる。 The transfer member holder may be a movable holder that can press and separate the transfer member from the image carrier. For example, the transfer member holder can be a holder that is driven to swing around a fulcrum on the outer shell member. More specifically, the transfer member is pressed against the image carrier by being supported by an arm swingable about an axis provided on the outer shell member, and the arm is driven to swing by a drive unit such as a solenoid. Examples thereof can be separated from the image carrier.
転写部材ホルダが可動ホルダである場合、該ホルダの動きに伴って該ホルダと外殻部材間の前記空間サイズが変動することが考えられるので、前記通気遮断部材を採用するときには、該通気遮断部材を転写部材の像担持体に対する圧接離隔に伴う該空間サイズの変動にかかわらず外殻部材と転写部材ホルダ間の空間を埋める伸縮可能(換言すれば、圧縮及び弾性復帰による膨張が可能)の部材としてもよい。 When the transfer member holder is a movable holder, it is considered that the space size between the holder and the outer shell member varies with the movement of the holder. Therefore, when the ventilation blocking member is employed, the ventilation blocking member is used. A member that can be expanded and contracted to fill the space between the outer shell member and the transfer member holder (in other words, can be expanded by compression and elastic return) regardless of the variation in the space size due to the pressure contact and separation of the transfer member with respect to the image carrier. It is good.
また転写部材ホルダが可動ホルダであって前記通気遮断部材が採用される場合、該通気遮断部材は、転写部材ホルダ及び外殻部材のうちいずれか一方に取り付け、他方に臨む部位に該他方に滑動接触可能のフィルムを貼着してもよい。 Further, when the transfer member holder is a movable holder and the air blocking member is employed, the air blocking member is attached to one of the transfer member holder and the outer shell member, and slides to the other side at a portion facing the other. A contactable film may be attached.
記録媒体の像担持体からの分離性をより向上させるために、外殻部材の記録媒体ガイド部に吸気口を形成するとともに該記録媒体ガイド部吸気口を前記吸気装置へ連通させてもよい。 In order to further improve the separation of the recording medium from the image carrier, an air inlet may be formed in the recording medium guide portion of the outer shell member and the recording medium guide portion air inlet may be communicated with the air intake device.
前記外殻部材の記録媒体ガイド部は、耐摩耗性を向上させたり、記録媒体との摺動性を向上させるために、記録媒体ガイドのための金属ガイド板と該金属ガイド板の取り付け部とで構成し、該金属ガイド板に形成された開口部と該開口部に対応させて該金属ガイド板取り付け部に形成された開口部とで記録媒体ガイド部吸気口を形成してもよい。 The recording medium guide portion of the outer shell member includes a metal guide plate for the recording medium guide and a mounting portion for the metal guide plate in order to improve wear resistance and slidability with the recording medium. The recording medium guide portion air inlet may be formed by an opening portion formed in the metal guide plate and an opening portion formed in the metal guide plate attachment portion corresponding to the opening portion.
記録媒体の円滑な搬送のために、前記記録媒体ガイド部の記録媒体進入側の端部は、少なくとも前記転写部材が前記像担持体に圧接されている状態においては、前記ニップ部出口と前記転写部材ホルダの像担持体側の端とを結ぶ直線の延長線より像担持体側へ突出しないようにしてもよい。 For smooth conveyance of the recording medium, the end of the recording medium guide portion on the recording medium entry side is at least in the state where the transfer member is pressed against the image carrier and the nip portion outlet and the transfer medium. You may make it not protrude to the image carrier side from the linear extension line which connects the edge by the side of the image carrier of a member holder.
前記吸気装置は前記外殻部材の通気口に連通する吸気ダクトを含むことができ、その場合、該吸気ダクトは該外殻部材と一体的に形成してもよい。該吸気ダクトに吸気ファンを取り付けることができる。 The intake device may include an intake duct that communicates with a vent of the outer shell member. In this case, the intake duct may be formed integrally with the outer shell member. An intake fan can be attached to the intake duct.
本発明に係る画像形成装置は、前記ニップ部から排出されてくる記録媒体から除電するための除電部材や、該ニップ部から出てきて像担持体に付着したままとなる記録媒体を像担持体から剥がすための分離爪等を有していてもよい。
除電部材を設ける場合、それは転写部材ホルダの像担持体側の端部に設けてもよい。
An image forming apparatus according to the present invention includes a charge removal member for removing electricity from the recording medium discharged from the nip portion, and a recording medium that comes out of the nip portion and remains attached to the image carrier. You may have the separation nail etc. for peeling from.
When providing a static eliminating member, it may be provided at the end of the transfer member holder on the image carrier side.
以上説明したように本発明によると、トナー像が形成される像担持体と、該像担持体に圧接されて該像担持体との間にニップ部を形成し、該ニップ部に記録媒体を通過させて該像担持体上のトナー像を該記録媒体に転写する転写部材とを含む画像形成装置であって、該ニップ部から排出されてくる記録媒体の像担持体からの分離性を、未定着トナー像の乱れを招くことなく向上させることができる画像形成装置を提供することができる。 As described above, according to the present invention, an image carrier on which a toner image is formed and a nip portion are formed between the image carrier and the image carrier, and a recording medium is placed in the nip portion. An image forming apparatus including a transfer member that passes and transfers a toner image on the image carrier to the recording medium, wherein the separation property of the recording medium discharged from the nip portion from the image carrier is It is possible to provide an image forming apparatus that can be improved without causing disturbance of an unfixed toner image.
以下、本発明の実施形態について図面を参照して説明する。
図1は、本発明に係る画像形成装置の例Aを示している。
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example A of an image forming apparatus according to the present invention.
画像形成装置Aは、タンデム型のフルカラープリンタである。プリンタAは、駆動ローラ21、これに対向するローラ22、駆動ローラ下方のローラ21a及び対向ローラ下方のローラ22aに巻き掛けられた無端中間転写ベルト2を有している。転写ベルト2は、図示省略のベルト駆動部で駆動される駆動ローラ21により図中反時計方向(図中矢印方向)に回転させることができる。 The image forming apparatus A is a tandem type full color printer. The printer A includes a driving roller 21, a roller 22 facing the driving roller 21, a roller 21a below the driving roller, and an endless intermediate transfer belt 2 wound around the roller 22a below the opposing roller. The transfer belt 2 can be rotated counterclockwise in the figure (arrow direction in the figure) by a driving roller 21 driven by a belt driving unit (not shown).
ローラ22a上の転写ベルト部分には転写ベルト2上の2次転写残トナー等をクリーニグブレードで除去清掃するクリーニング装置8が臨んでいる。 A cleaning device 8 that removes and cleans secondary transfer residual toner and the like on the transfer belt 2 with a cleaning blade faces the transfer belt portion on the roller 22a.
駆動ローラ21上の転写ベルト部分には、2次転写ローラ3が臨んでいる。
転写ローラ3は後述するアーム駆動部37(図2、図3参照)にて中間転写ベルト2に対し圧接離隔可能である。2次転写ローラ3の表層部は弾性材料で形成されており、転写ベルト2への圧接状態では中間転写ベルト2との間にニップ部Nを形成し、中間転写ベルト2の回転に従動して、或いは、後述するように該ニップ部に送り込まれる記録媒体50の移動に従動して回転する。2次転写ローラ3には、図示省略の2次転写バイアス電源装置から2次転写バイアスを印加することができる。
The secondary transfer roller 3 faces the transfer belt portion on the driving roller 21.
The transfer roller 3 can be pressed against and separated from the intermediate transfer belt 2 by an arm driving unit 37 (see FIGS. 2 and 3) described later. The surface layer portion of the secondary transfer roller 3 is formed of an elastic material, and a nip portion N is formed between the secondary transfer roller 3 and the intermediate transfer belt 2 when pressed against the transfer belt 2, and is driven by the rotation of the intermediate transfer belt 2. Alternatively, as will be described later, the recording medium 50 is rotated following the movement of the recording medium 50 fed into the nip portion. A secondary transfer bias can be applied to the secondary transfer roller 3 from a secondary transfer bias power supply device (not shown).
2次転写ローラ3の下方には、タイミングローラ対4が配置されており、さらにその下方に、記録媒体50を収容した記録媒体収容カセット5が着脱可能に装着される。カセット5に収容された記録媒体50は、媒体供給ローラ51にて1枚ずつ引き出してタイミングローラ対4へ供給することができる。記録媒体50としては記録紙、オーバーヘッドプロジエクタ用シート等を採用できる。 A timing roller pair 4 is disposed below the secondary transfer roller 3, and a recording medium storage cassette 5 that stores a recording medium 50 is detachably mounted below the pair of timing rollers 4. The recording medium 50 accommodated in the cassette 5 can be pulled out one by one by the medium supply roller 51 and supplied to the timing roller pair 4. As the recording medium 50, a recording sheet, an overhead projector sheet, or the like can be used.
転写ローラ3の上方には定着装置6が配置されている。
定着装置6は加熱される定着ローラ61とこれに圧接される加圧ローラ62とを含むものである。
記録媒体搬送方向において定着装置6の下流側には媒体排出ローラ対71及び媒体排出トレイ7が設けられている。
A fixing device 6 is disposed above the transfer roller 3.
The fixing device 6 includes a heated fixing roller 61 and a pressure roller 62 pressed against the fixing roller 61.
A medium discharge roller pair 71 and a medium discharge tray 7 are provided on the downstream side of the fixing device 6 in the recording medium conveyance direction.
中間転写ベルト2を巻き掛けたローラ21a、22aの間には、転写ベルト2に沿って、ローラ22aから21aに向けて、イエロー画像形成部Y、マゼンタ画像形成部M、シアン画像形成部C及びブラック画像形成部Kがこの順序で配置されている。 Between the rollers 21a and 22a around which the intermediate transfer belt 2 is wound, the yellow image forming unit Y, the magenta image forming unit M, the cyan image forming unit C, and the rollers 22a to 21a along the transfer belt 2 Black image forming portions K are arranged in this order.
Y、M、C、Kの各画像形成部は、静電潜像担持体としてドラム型の感光体11を備えており、該感光体の周囲に帯電器12、画像露光装置13、現像器14、1次転写ローラ15、感光体上の1次転写残トナー等を除去清掃するリーニング装置16及び光除電装置17等がこの順序で配置されている。 Each of the image forming units Y, M, C, and K includes a drum-type photoconductor 11 as an electrostatic latent image carrier, and a charger 12, an image exposure device 13, and a developer 14 are provided around the photoconductor. A primary transfer roller 15, a leaning device 16 that removes and cleans the primary transfer residual toner on the photosensitive member, a light neutralizing device 17, and the like are arranged in this order.
各画像形成部における感光体11、帯電器12、現像器14、クリーニング装置16及び光除電装置17はカートリッジケースに設けられており、該カートリッジケースとともにプロセスカートリッジを形成している。すなわち、イエロー画像形成部Yを形成するためのイエロープロセスカートリッジYC、マゼンタ画像形成部Mを形成するためのマゼンタプロセスカートリッジMC、シアン画像形成部Cを形成するためのシアンプロセスカートリッジCC、ブラック画像形成部Kを形成するためのブラックプロセスカートリッジKCである。 The photoreceptor 11, the charger 12, the developing device 14, the cleaning device 16, and the light neutralizing device 17 in each image forming unit are provided in a cartridge case, and form a process cartridge together with the cartridge case. That is, the yellow process cartridge YC for forming the yellow image forming portion Y, the magenta process cartridge MC for forming the magenta image forming portion M, the cyan process cartridge CC for forming the cyan image forming portion C, and the black image forming This is a black process cartridge KC for forming the portion K.
図1に示すように、各画像形成部の1次転写ローラ15は転写ベルト2を間にして感光体11に対向しており、ベルトの走行に従動回転する。1次転写ローラ15には、感光体11上に形成されるトナー像をベルト2へ1次転写するための1次転写バイアスを図示省略の1次転写バイアス電源装置から印加できる。
露光装置13は、図示省略のパーソナルコンピュータ等から提供される画像情報に応じて、レーザービームを用いて感光体11に画像露光を施す。
As shown in FIG. 1, the primary transfer roller 15 of each image forming unit faces the photoconductor 11 with the transfer belt 2 in between, and is rotated by the running of the belt. A primary transfer bias for primary transfer of a toner image formed on the photoreceptor 11 to the belt 2 can be applied to the primary transfer roller 15 from a primary transfer bias power supply device (not shown).
The exposure device 13 performs image exposure on the photoconductor 11 using a laser beam in accordance with image information provided from a personal computer (not shown) or the like.
各画像形成部における感光体11は、ここでは負帯電性の感光体であり、図示省略の感光体駆動モータにて図中時計方向回りに回転駆動される。
各画像形成部における帯電器12には、図示省略の帯電用電源から所定のタイミングで感光体帯電のための電圧が印加される。
The photoconductor 11 in each image forming unit is a negatively chargeable photoconductor here, and is rotated clockwise in the drawing by a photoconductor drive motor (not shown).
A voltage for charging the photosensitive member is applied to the charger 12 in each image forming unit at a predetermined timing from a charging power supply (not shown).
各画像形成部における現像器14は、本例では、負帯電性トナーを採用するもので、感光体11上に形成される静電潜像を、図示省略の現像バイアス印加電源装置から現像バイアス電圧が印加される現像ローラ141で反転現像することができる。 The developing unit 14 in each image forming unit employs a negatively chargeable toner in this example, and an electrostatic latent image formed on the photoconductor 11 is developed from a developing bias applying power supply device (not shown) to a developing bias voltage. Can be reversely developed by the developing roller 141 to which is applied.
各画像形成部におけるクリーニング装置16は感光体11上の1次転写残トナー等をクリーニグブレードで除去清掃するものである。 A cleaning device 16 in each image forming unit removes and cleans primary transfer residual toner and the like on the photosensitive member 11 with a cleaning blade.
ここでプリンタAによる画像形成について説明しておく。
プリンタAは、画像形成部Y、M、C及びKのうち少なくとも一つを用いて画像形成できる。画像形成部Y、M、C及びKのすべてを用いてフルカラー画像を形成する場合を例にとると、先ず、イエロー画像形成部Yにおいてイエロートナー像を形成し、これを転写ベルト2に1次転写する。
Here, image formation by the printer A will be described.
The printer A can form an image using at least one of the image forming units Y, M, C, and K. Taking a case where a full color image is formed using all of the image forming portions Y, M, C, and K as an example, first, a yellow toner image is formed in the yellow image forming portion Y, and this is formed on the transfer belt 2 as a primary. Transcript.
すなわち、イエロー画像形成部Yにおいて、感光体11が図中時計方向に回転駆動され、帯電器12にて表面が一様に所定電位に帯電せしめられ、その帯電域に画像露光装置13からイエロー画像用の画像露光が施され、感光体11上にイエロー用静電潜像が形成される。この静電潜像はイエロートナーを有する現像器14の現像バイアスが印加された現像ローラ141にて現像されて可視イエロートナー像となり、該トナー像が1次転写ローラ15にて転写ベルト2上に1次転写される。このとき、1次転写ローラ15には図示省略の電源装置から1次転写バイアス電圧が印加される。 That is, in the yellow image forming portion Y, the photosensitive member 11 is rotationally driven in the clockwise direction in the figure, and the surface is uniformly charged to a predetermined potential by the charger 12, and the yellow image is transferred from the image exposure device 13 to the charged area. Image exposure is performed, and an electrostatic latent image for yellow is formed on the photoreceptor 11. The electrostatic latent image is developed by a developing roller 141 to which a developing bias of a developing unit 14 having yellow toner is applied to become a visible yellow toner image, and the toner image is transferred onto the transfer belt 2 by a primary transfer roller 15. Primary transfer is performed. At this time, a primary transfer bias voltage is applied to the primary transfer roller 15 from a power supply device (not shown).
同様にして、マゼンタ画像形成部Mにおいてマゼンタトナー像が形成されて転写ベルト2に転写され、シアン画像形成部Cにおいてシアントナー像が形成されて転写ベルト2に転写され、ブラック画像形成部Kにおいてブラックトナー像が形成されて転写ベルト2に転写される。 Similarly, a magenta toner image is formed in the magenta image forming unit M and transferred to the transfer belt 2, a cyan toner image is formed in the cyan image forming unit C and transferred to the transfer belt 2, and in the black image forming unit K. A black toner image is formed and transferred to the transfer belt 2.
イエロー、マゼンタ、シアン、ブラックのトナー像はこれらが中間転写ベルト2上に重ねて転写されるタイミングで形成される。
かくして転写ベルト2上に形成された多重トナー像は転写ベルト2の回動により2次転写ローラ3へ向け移動する。
Yellow, magenta, cyan, and black toner images are formed at the timing when these toner images are transferred onto the intermediate transfer belt 2 in an overlapping manner.
Thus, the multiple toner image formed on the transfer belt 2 moves toward the secondary transfer roller 3 by the rotation of the transfer belt 2.
一方、記録媒体50がカセット5から媒体供給ローラ51にて引き出され、タイミングローラ対4へ供給され、待機している。 On the other hand, the recording medium 50 is pulled out from the cassette 5 by the medium supply roller 51, supplied to the timing roller pair 4, and is on standby.
タイミングローラ対4のところで待機する記録媒体Sは、中間転写ベルト2にて送られてくる多重トナー像に合わせて、転写ベルト2とこれに圧接された2次転写ローラ3とのニップ部Nに向け供給開始され、図示省略の電源装置から2次転写バイアスが印加された2次転写ローラ3にて該多重トナー像が記録媒体50上に2次転写される。 The recording medium S waiting at the timing roller pair 4 is aligned with the nip portion N between the transfer belt 2 and the secondary transfer roller 3 pressed against the multiple toner images sent by the intermediate transfer belt 2. The multiple toner image is secondarily transferred onto the recording medium 50 by the secondary transfer roller 3 to which a secondary transfer bias is applied from a power supply device (not shown).
その後記録媒体50は定着装置6に通され、そこで多重トナー像が加熱加圧下に記録媒体50に定着される。記録媒体50はひき続き、媒体排出ローラ対71等にて排出トレイ7に排出される。 Thereafter, the recording medium 50 is passed through the fixing device 6 where the multiple toner images are fixed on the recording medium 50 under heat and pressure. The recording medium 50 is continuously discharged to the discharge tray 7 by the medium discharge roller pair 71 and the like.
各画像形成部において、トナー像の1次転写後感光体11上に残留するトナー等はクリーニング装置16により除去清掃され、残留電荷は光除電装置17により消去される。また、中間転写ベルト2上の2次転写残トナー等はクリーニング装置8にて除去清掃される。 In each image forming unit, the toner remaining on the photoreceptor 11 after the primary transfer of the toner image is removed and cleaned by the cleaning device 16, and the residual charge is erased by the photostatic device 17. Further, the secondary transfer residual toner and the like on the intermediate transfer belt 2 are removed and cleaned by the cleaning device 8.
次に2次転写ローラ3の周辺の構造等についてさらに説明する。
図1では図示を省略しているが、図2及び図3に示すように、2次転写ローラ3は、中間転写ベルト2とローラ3とのニップ部Nより記録媒体搬送方向において下流側領域でローラ3周面を覆う転写ローラホルダ31に回転可能に支持されている。
転写ローラ3及びホルダ31は、転写ベルト2とは反対側から外殻部材33で覆われている。
Next, the structure around the secondary transfer roller 3 will be further described.
Although not shown in FIG. 1, as shown in FIGS. 2 and 3, the secondary transfer roller 3 is located in a downstream region in the recording medium conveyance direction from the nip portion N between the intermediate transfer belt 2 and the roller 3. A transfer roller holder 31 covering the circumferential surface of the roller 3 is rotatably supported.
The transfer roller 3 and the holder 31 are covered with an outer shell member 33 from the side opposite to the transfer belt 2.
外殻部材33の上端部の手前側及び奥側の各部位に支点軸33sが設けられている。各軸33sにはアーム36の上端部361が回動可能に嵌められている。各アーム36の下端部362に転写ローラホルダ31から突設した軸311が支持されている。ホルダ31の突出軸311の中心軸線と転写ローラ3の回転中心軸線とは一致している。 A fulcrum shaft 33 s is provided at each of the front side and the back side of the upper end portion of the outer shell member 33. An upper end 361 of an arm 36 is rotatably fitted to each shaft 33s. A shaft 311 protruding from the transfer roller holder 31 is supported on the lower end portion 362 of each arm 36. The center axis of the protruding shaft 311 of the holder 31 and the rotation center axis of the transfer roller 3 coincide.
外殻部材33にはソレノイド利用のアーム駆動部37が搭載されており、転写ベルト2上のトナー像を記録媒体50に2次転写するにあたっては該駆動部にてアーム36を揺動させて転写ローラ3を中間転写ベルト2へ圧接させることができ、また、該圧接状態から離隔させることができる。 The outer shell member 33 is equipped with an arm drive unit 37 using a solenoid. When the toner image on the transfer belt 2 is secondarily transferred to the recording medium 50, the arm 36 is swung by the drive unit and transferred. The roller 3 can be brought into pressure contact with the intermediate transfer belt 2 and can be separated from the pressure contact state.
転写ローラホルダ31の転写ベルト2側の端部外周面に除電部材(ここでは除電布)32が取り付けられている。除電部材32は前記ニップ部Nから排出されてくる記録媒体50から除電して該記録媒体50の転写ベルト2からの分離性を向上させ、記録媒体50の定着装置6への搬送を円滑ならしめるためのものである。除電部材32は本例では接地されるが、除電電圧を印加する電源に接続されてもよい。 A discharge member (discharge cloth here) 32 is attached to the outer peripheral surface of the transfer roller holder 31 on the transfer belt 2 side. The neutralizing member 32 neutralizes the recording medium 50 discharged from the nip portion N to improve the separation of the recording medium 50 from the transfer belt 2 and to smoothly convey the recording medium 50 to the fixing device 6. Is for. Although the static elimination member 32 is grounded in this example, it may be connected to a power source that applies a static elimination voltage.
既述のとおり転写ローラ3及びホルダ31は、転写ベルト2とは反対側から外殻部材33で覆われている。外殻部材33はホルダ31に対し間隔をおいて位置しており、外殻部材33とホルダ31との間には空間(吸気通路)30が形成されている。 As described above, the transfer roller 3 and the holder 31 are covered with the outer shell member 33 from the side opposite to the transfer belt 2. The outer shell member 33 is located at a distance from the holder 31, and a space (intake passage) 30 is formed between the outer shell member 33 and the holder 31.
外殻部材33は、転写ローラホルダ31の転写ベルト2側の端部の若干上方に位置する記録媒体ガイド部33gを有している。ガイド部33gは金属製の記録媒体ガイド板331とこれを取り付けた外殻部材本体の部分332とで構成されている。 The outer shell member 33 has a recording medium guide portion 33g located slightly above the end of the transfer roller holder 31 on the transfer belt 2 side. The guide portion 33g includes a metal recording medium guide plate 331 and a portion 332 of the outer shell member body to which the guide plate 331 is attached.
ガイド部33gの向かい側にはニップ部Nから出てきて転写ベルト2に貼り付いたまま転写ベルト2とともに移行することがあり得る記録媒体をベルト2から剥がすための分離爪38が設置されている。 On the opposite side of the guide portion 33g, a separation claw 38 is provided for peeling from the belt 2 a recording medium that comes out of the nip portion N and can be transferred together with the transfer belt 2 while being stuck to the transfer belt 2.
外殻部材33の転写ローラホルダ31に臨む部分に通気口Hが形成されている。図3に示すように通気口Hは複数形成されており、それぞれ大きさが同じものや異なるものがあるが、ここではいずれも通気口Hと総称する。 A vent H is formed in a portion of the outer shell member 33 facing the transfer roller holder 31. As shown in FIG. 3, a plurality of vent holes H are formed, each having the same size or different sizes.
外殻部材33には吸気装置300が連設されている。吸気装置300は外殻部材33と一体的に形成された通気ダクト34と該ダクトに取り付けられた吸気ファン35とを含むものである。外殻部材33の通気口Hは外殻部材33とホルダ31との間の空間(吸気通路)30をダクト34へ連通させている。 An intake device 300 is connected to the outer shell member 33. The intake device 300 includes a ventilation duct 34 formed integrally with the outer shell member 33 and an intake fan 35 attached to the duct. The vent H of the outer shell member 33 communicates the space (intake passage) 30 between the outer shell member 33 and the holder 31 to the duct 34.
外殻部材33の記録媒体ガイド部33gの下端部(ここではガイド板331の下端部)と転写ローラホルダ31の転写ベルト2側の端部との間に前記空間30へ通じる吸気口hが提供されている。
従って、吸気装置300の吸気ファン35を運転することで、吸気口h→空間30→外殻部材33の通気口H→吸気装置300のダクト34→ファン35へと吸気することができる。
An air inlet h leading to the space 30 is provided between a lower end portion of the recording medium guide portion 33g of the outer shell member 33 (here, a lower end portion of the guide plate 331) and an end portion of the transfer roller holder 31 on the transfer belt 2 side. Has been.
Therefore, by operating the intake fan 35 of the intake device 300, it is possible to intake air from the intake port h → the space 30 → the vent hole H of the outer shell member 33 → the duct 34 of the intake device 300 → the fan 35.
かかる吸気により、ベルト2と転写ローラ3とのニップ部Nから排出されてくる記録媒体50を転写ベルト2から分離させるように転写ローラホルダ31側へ引き寄せ、また、除電部材32による記録媒体からの十分な除電を可能とし、その後の記録媒体の定着装置6への移行を円滑ならしめることができる。しかも、吸気は記録媒体50の未定着トナー像を保持した面とは反対側の面に対してなされるので、未定着トナー像の乱れが抑制される状態で記録媒体50をホルダ31側へ引き寄せることができる。 By this suction, the recording medium 50 discharged from the nip N between the belt 2 and the transfer roller 3 is drawn toward the transfer roller holder 31 so as to be separated from the transfer belt 2, and from the recording medium by the charge removing member 32. Sufficient charge removal is possible, and the subsequent transfer of the recording medium to the fixing device 6 can be smoothed. In addition, since the suction is performed on the surface of the recording medium 50 opposite to the surface on which the unfixed toner image is held, the recording medium 50 is drawn toward the holder 31 in a state where the disturbance of the unfixed toner image is suppressed. be able to.
また、ここでは、吸気を吸気口h→空間30→通気口H→ダクト34へと集中的に行い、それにより吸気口hから強く吸気し、より確実に記録媒体をホルダ31側へ(従って除電部材32側へ)引き寄せられるように、空間30における吸気流の方向において通気口Hの下流側に通気遮断部材Sが配置されている。 Here, the intake air is concentrated in the order of the intake port h → the space 30 → the vent port H → the duct 34, whereby strong intake is performed from the intake port h, and the recording medium is more reliably moved to the holder 31 side (therefore, charge removal). A ventilation blocking member S is arranged on the downstream side of the ventilation hole H in the direction of the intake air flow in the space 30 so as to be pulled toward the member 32 side.
通気遮断部材Sは伸縮可能の弾性材料からなっており、さらに言えば、圧縮可能で、外力解除又はゆるめにより弾性復元力で膨張可能の弾性材料(本例ではウレタンフォーム材)からなっており、転写ローラホルダ31に貼着され、空間30を埋めている。 The air-blocking member S is made of an elastic material that can be expanded and contracted, and more specifically, it is made of an elastic material that can be compressed and expanded by an elastic restoring force by releasing or loosening an external force (in this example, a urethane foam material). Attached to the transfer roller holder 31, the space 30 is filled.
通気遮断部材Sは少なくとも転写ローラ3がベルト2に圧接された状態で空間30を埋めればよいが、ここでは、転写ローラ3のベルト2に対する圧接状態、離隔状態のいずれにおいても空間30を埋める。そして、転写ローラ3のベルト2に対する圧接離隔に伴い転写ローラホルダ3が動いても通気遮断部材Sと外殻部材33内面との間の摺動性を良好に保つとともに通気遮断部材Sの保護のために、通気遮断部材Sの外殻部材33内面に臨む部位に滑動接触可能のフィルムf(本例ではポリエチレンテレフタレートフィルム)を貼着してある。 The air blocking member S may fill the space 30 with at least the transfer roller 3 being in pressure contact with the belt 2, but here the space 30 is filled both in the pressure contact state of the transfer roller 3 with respect to the belt 2 and in the separated state. Even if the transfer roller holder 3 moves as the transfer roller 3 is pressed against and separated from the belt 2, the slidability between the air blocking member S and the inner surface of the outer shell member 33 is kept good and the air blocking member S is protected. Therefore, a film f (polyethylene terephthalate film in this example) that can be slidably contacted is attached to a portion of the ventilation block member S that faces the inner surface of the outer shell member 33.
なお、ニップ部Nから排出されてくる記録媒体50の定着装置6への移行を妨げないように、少なくとも転写ローラ3が転写ベルト2へ圧接されている状態では、ニップ部Nの出口と転写ローラホルダ31のベルト2側の端とを結ぶ直線の延長線L(換言すれば、ニップ部Nの出口ラインと転写ローラホルダ31のベルト2側の端縁とを含む面)よりベルト2側へ記録媒体ガイド部33gの記録媒体進入側の端部(図2ではガイド板331の下端部)が突出しないようにしてある。 Note that at least the transfer roller 3 is in pressure contact with the transfer belt 2 so that the transfer of the recording medium 50 discharged from the nip N to the fixing device 6 is not hindered, and the exit of the nip N and the transfer roller Recording to the belt 2 side from a linear extension line L (in other words, the surface including the exit line of the nip portion N and the edge of the transfer roller holder 31 on the belt 2 side) connecting the end of the holder 31 on the belt 2 side. The end of the medium guide portion 33g on the recording medium entry side (the lower end portion of the guide plate 331 in FIG. 2) is prevented from projecting.
また、プリンタAでは、ニップ部Nから排出されてくる記録媒体50をより確実に前記記録媒体ガイド部33gに引き寄せて定着装置6へ一層円滑に移行させるようにするため、記録媒体ガイド部33gにも前記吸気装置300のダクト34に連通する吸気口を形成してある。 In the printer A, the recording medium 50 discharged from the nip portion N is more surely drawn to the recording medium guide portion 33g and more smoothly transferred to the fixing device 6, so that the recording medium guide portion 33g Also, an intake port communicating with the duct 34 of the intake device 300 is formed.
記録媒体ガイド部33gの吸気口は、記録媒体ガイド板331に設けた吸気口h1とガイド板331を取り付けた外殻部材33の本体部分332に形成した吸気口h2(吸気口h1に重なる吸気口h2)とで提供されている。図3に示すように、吸気口h1、h2は複数形成されており、それぞれ大きさが同じものや異なるものがあるが、ここではいずれも吸気口h1、h2と総称している。 The recording medium guide portion 33g has an intake port, an intake port h1 provided in the recording medium guide plate 331, and an intake port h2 formed in the main body portion 332 of the outer shell member 33 to which the guide plate 331 is attached (the intake port overlapping the intake port h1) h2). As shown in FIG. 3, a plurality of intake ports h1 and h2 are formed, and some of them have the same size or different sizes, but here they are collectively referred to as intake ports h1 and h2.
以上、タンデム型カラー画像形成装置について説明したが、本発明は他のタイプのカラー画像形成装置にも適用でき、モノクロ画像形成装置にも適用できる。 Although the tandem type color image forming apparatus has been described above, the present invention can be applied to other types of color image forming apparatuses and also to monochrome image forming apparatuses.
本発明は、像担持体とこれに圧接される転写部材とのニップ部から排出されてくる記録媒体の該像担持体からの分離性を、未定着トナー像の乱れを招くことなく向上させることができる画像形成装置を提供することに利用できる。 The present invention improves the separability of a recording medium discharged from the nip portion between an image carrier and a transfer member pressed against the image carrier from the image carrier without causing disturbance of an unfixed toner image. The present invention can be used to provide an image forming apparatus capable of performing the above.
A プリンタ
Y イエロー画像形成部
M マゼンタ画像形成部
C シアン画像形成部
K ブラック画像形成部
YC、MC、CC、KC プロセスカートリッジ
11 感光体
12 帯電器
13 画像露光装置
14 現像器
141 現像ローラ
15 1次転写ローラ
16 クリーニング装置
17 光除電装置
21 駆動ローラ
22 対向ローラ
21a、22a ローラ
2 中間転写ベルト
3 2次転写ローラ
31 転写ローラホルダ
311 転写ローラホルダの突出軸
32 除電部材
33 外殻部材
H 通気口
30 空間(吸気通路)
S 通気遮断部材
f 滑動接触可能フィルム
33g 記録媒体ガイド部
h 吸気口
331 記録媒体ガイド板
h1 吸気口
332 外殻部材本体の部分
h2 吸気口
300 吸気装置
34 通気ダクト
35 吸気ファン
33s 支点軸
36 アーム
361 アーム上端部
362 アーム下端部
37 アーム駆動部
38 分離爪
D ホルダ回動駆動部
N ベルト2とローラ3のニップ部
4 タイミングローラ対
5 記録媒体収容カセット
51 媒体引出しローラ
50 記録媒体
6 定着装置
61 定着ローラ
62 加圧ローラ
71 媒体排出ローラ対
7 媒体排出トレイ
8 クリーニング装置
A Printer Y Yellow image forming unit M Magenta image forming unit C Cyan image forming unit K Black image forming unit YC, MC, CC, KC Process cartridge 11 Photoconductor 12 Charger 13 Image exposure device 14 Developer 141 Developer roller 15 Primary Transfer roller 16 Cleaning device 17 Light neutralization device 21 Drive roller 22 Opposing rollers 21a, 22a Roller 2 Intermediate transfer belt 3 Secondary transfer roller 31 Transfer roller holder 311 Projection shaft 32 of the transfer roller holder Static neutralization member 33 Outer shell member H Vent 30 Space (intake passage)
S air blocking member f slidable contactable film 33g recording medium guide portion h air inlet 331 recording medium guide plate h1 air inlet 332 portion of outer shell member main body h2 air inlet 300 air intake device 34 air duct 35 air intake fan 33s fulcrum shaft 36 arm 361 Arm upper end portion 362 Arm lower end portion 37 Arm drive portion 38 Separation claw D Holder rotation drive portion N Nip portion 4 between belt 2 and roller 3 Timing roller pair 5 Recording medium storage cassette 51 Medium drawing roller 50 Recording medium 6 Fixing device 61 Fixing Roller 62 Pressure roller 71 Medium discharge roller pair 7 Medium discharge tray 8 Cleaning device
Claims (11)
該像担持体に圧接されて該像担持体との間にニップ部を形成し、該ニップ部に記録媒体を通過させて該像担持体上のトナー像を該記録媒体に転写する転写部材とを含む画像形成装置であり、
記録媒体搬送方向において前記ニップ部より下流側領域で前記転写部材を覆って該転写部材を保持する転写部材ホルダと、
該転写部材ホルダを前記転写部材とは反対側から間隔をおいて覆うとともに、記録媒体搬送方向において該転写部材ホルダより下流側に記録媒体ガイド部を有している外殻部材と、
前記転写部材とは反対側の該外殻部材の背後において該外殻部材に連設された吸気装置とを含んでおり、
前記外殻部材には該外殻部材と前記転写部材ホルダとの間の空間を前記吸気装置へ連通させる通気口が形成されており、
前記記録媒体ガイド部は前記転写部材ホルダの前記像担持体側の端部との間に吸気口を提供するように配置されており、
前記吸気装置により前記吸気口から前記外殻部材と前記転写部材ホルダとの間の空間及び前記通気口を介して吸気して前記ニップ部から排出されてくる記録媒体に前記転写部材ホルダ側への吸引力を作用させることができることを特徴とする画像形成装置。 An image carrier on which a toner image is formed;
A transfer member that is pressed against the image carrier to form a nip portion with the image carrier, and passes a recording medium through the nip portion to transfer a toner image on the image carrier to the recording medium; An image forming apparatus including
A transfer member holder that covers the transfer member in a region downstream of the nip portion in the recording medium conveyance direction and holds the transfer member;
An outer shell member that covers the transfer member holder at a distance from the side opposite to the transfer member and has a recording medium guide portion on the downstream side of the transfer member holder in the recording medium conveyance direction;
An air intake device connected to the outer shell member behind the outer shell member on the side opposite to the transfer member;
The outer shell member is formed with a vent for communicating a space between the outer shell member and the transfer member holder to the intake device,
The recording medium guide portion is disposed so as to provide an air inlet between the transfer member holder and the end portion on the image carrier side of the transfer member holder,
The recording medium that is sucked from the suction port by the suction device through the air gap through the space between the outer shell member and the transfer member holder and discharged from the nip portion to the transfer member holder side. An image forming apparatus capable of applying a suction force.
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