JP2006184639A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP2006184639A
JP2006184639A JP2004378868A JP2004378868A JP2006184639A JP 2006184639 A JP2006184639 A JP 2006184639A JP 2004378868 A JP2004378868 A JP 2004378868A JP 2004378868 A JP2004378868 A JP 2004378868A JP 2006184639 A JP2006184639 A JP 2006184639A
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belt
image
intermediate transfer
image forming
forming apparatus
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JP4536509B2 (en
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Katsuya Kawagoe
克哉 川越
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Ricoh Co Ltd
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Ricoh Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent belt scratch and image defects by stabilizing the running of a belt. <P>SOLUTION: Spacers 120 are disposed outside the image area of an image forming apparatus (not shown). If an intermediate transfer belt 10 slackens during the running of the belt, the intermediate transfer belt 10 will first come into contact with the spacers 120 outside the image area. Upon coming into contact with the spacers 120, the intermediate transfer belt 10 is pressed, and the intermediate transfer belt 10 is prevented from coming into contact with a secondary pre-transfer guide member 101 and from scratching the belt. In addition, setting the spacers 120 at two positions outside the image area, one before and the other after the image area, enables the spacers 120 to stably press the intermediate transfer belt 10, thus decreasing image defects. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、複写機、ファクシミリ、レーザービームプリンタ等に用いられる電子写真方式の画像形成装置に関し、特に、現像装置、クリーニング装置、転写ベルトユニットを有する画像形成装置の中間転写体に関する。 The present invention relates to an electrophotographic image forming apparatus used for a copying machine, a facsimile, a laser beam printer, and the like, and more particularly to an intermediate transfer member of an image forming apparatus having a developing device, a cleaning device, and a transfer belt unit.

今日、電子写真装置では、市場からの要求にともない、カラー複写機やカラープリンタなど、カラー画像出力のものが多くなってきている。カラー電子写真装置で代表的な方式として複数の感光体にそれぞれ個別に現像装置を備え、各感光体上にそれぞれ単色トナー画像を形成し、それらの単色トナー画像を順次転写して中間転写ベルト上に合成カラー画像を作り、これを転写材上に2次転写ローラ、2次転写ベルト等により一括転写するタンデム中間転写型と、複数の感光体上にそれぞれ単色トナー画像を作り、これを順次転写材上に直接転写するタンデム直接転写型のものとがある。タンデム直接転写型の場合は、転写搬送ベルトにて転写材を搬送し、感光体上のトナー像を直接転写材に転写する。いずれにしてもベルト状の像担持体を使用しており、ベルト上、あるいはベルト上の転写材上にて各色トナー像を重ね合わせるため、このベルトの走行安定性が非常に重要となってくる。 Today, with the demand from the market, many electrophotographic apparatuses, such as color copiers and color printers, output color images. As a typical system for color electrophotographic devices, a plurality of photoconductors are each provided with a developing device, and a single color toner image is formed on each photoconductor, and these single color toner images are sequentially transferred onto an intermediate transfer belt. Create a composite color image, transfer it onto a transfer material with a secondary transfer roller, a secondary transfer belt, etc., and a tandem intermediate transfer type to create a single color toner image on each of multiple photoreceptors. There are tandem direct transfer types that transfer directly onto the material. In the case of the tandem direct transfer type, the transfer material is conveyed by a transfer conveyance belt, and the toner image on the photoconductor is directly transferred to the transfer material. In any case, a belt-like image carrier is used, and the toner images of the respective colors are superimposed on the belt or on the transfer material on the belt. Therefore, the running stability of the belt becomes very important. .

なお、本願発明に関連する先行技術として、特許文献1は、像担持体上に形成した着色画像を画像形成媒体上に転写する為に画像形成媒体を転写位置に案内する上下2つの転写案内部材を改良した画像形成装置の技術に関するものである。そしてその技術は、像担持体から画像形成媒体に着色画像を転写させる転写位置に、画像形成媒体の進入を規制する転写案内部材を像担持体側に設け、画像形成装置から像担持体と一体で脱着可能に構成している。このため、精度良く転写案内部材を設定することができることとなり、常に安定した転写紙の進入と像担持体との密着を図ることができ、転写チリの無い良好な画像を得ることができる。 As a prior art related to the present invention, Patent Document 1 discloses two upper and lower transfer guide members for guiding an image forming medium to a transfer position in order to transfer a colored image formed on the image carrier onto the image forming medium. The present invention relates to a technique of an image forming apparatus improved. The technology provides a transfer guide member for restricting the entry of the image forming medium at the transfer position where the colored image is transferred from the image bearing member to the image forming medium, and is integrated with the image carrier from the image forming apparatus. It is configured to be removable. For this reason, it is possible to set the transfer guide member with high accuracy, and it is possible to always achieve stable entrance of the transfer paper and close contact with the image carrier, and to obtain a good image without transfer dust.

特開2000−172048号公報JP 2000-172048 A

しかしながら、前述のタンデム中間転写型の場合、中間転写ベルト上にトナー像を作成し、その後、転写材へ転写されるまでの間にベルト上のトナー像が乱れてしまうという問題が発生する場合がある。たとえば、2次転写部におけるベルト速度がベルトを駆動する駆動ローラの速度よりも遅い場合、2次転写部においてベルトが遅くなるため、この2次転写前にてベルトのたるみが生じ、近接部材にトナー像が接触してしまい、画像こすれ問題として顕在化する。
また、ベルトが近接部材に当接することにより、ベルトに傷が発生してしまう場合がある。このたるみに関しては、各ローラの速度差、中間転写ベルトと2次転写ベルト、2次転写ローラ等との速度差がばらつきにより発生した際に発生しやすい。転写材にトナー像を転写するためにベルトに当接する2次転写ローラはゴムローラにて構成されることが多く、これは温度、湿度により径が変化し、表面速度が変化する場合が多い。
However, in the case of the above-described tandem intermediate transfer type, there may be a problem that the toner image on the belt is disturbed before the toner image is formed on the intermediate transfer belt and then transferred to the transfer material. is there. For example, when the belt speed in the secondary transfer unit is slower than the speed of the driving roller for driving the belt, the belt becomes slow in the secondary transfer unit. The toner image comes into contact, and this becomes obvious as an image rubbing problem.
Further, when the belt comes into contact with the proximity member, the belt may be damaged. This sag is likely to occur when the speed difference between the rollers and the speed difference between the intermediate transfer belt, the secondary transfer belt, the secondary transfer roller, and the like are caused by variations. The secondary transfer roller that abuts on the belt to transfer the toner image to the transfer material is often composed of a rubber roller, and this often changes in diameter due to temperature and humidity, and the surface speed often changes.

また、2次転写ベルトを転写装置として使用している場合においても、この2次転写ベルトを駆動している駆動ローラ径は温湿度、加工ばらつきにより変動する。これらの変動により、ベルトと2次転写ローラの速度差はばらつくことになる。ばらつきにより2次転写ローラ表面の速度がベルトよりも遅くなった場合に、ベルトが2次転写前にてたるんでしまうこととなる。
また、タンデム直接転写型の場合も同様であり、転写材が転写材搬送ベルト上に乗ったまま速度差が生じると、ベルトが転写材ごとたるみ、近接部材に接触する場合がある。また、転写材搬送ベルト上に位置合わせ用のパターン画像を作成する場合が多く、この画像がたるみにより乱されるという問題が発生する場合がある。
Even when the secondary transfer belt is used as a transfer device, the diameter of the driving roller that drives the secondary transfer belt varies depending on temperature and humidity and processing variations. Due to these fluctuations, the speed difference between the belt and the secondary transfer roller varies. When the speed of the surface of the secondary transfer roller becomes slower than the belt due to the variation, the belt is slackened before the secondary transfer.
The same applies to the case of the tandem direct transfer type. If a speed difference occurs while the transfer material is placed on the transfer material conveyance belt, the belt may sag together with the transfer material and may contact the proximity member. In many cases, a pattern image for alignment is created on the transfer material conveyance belt, and this image may be disturbed by slack.

本発明は、上記問題点に鑑みなされたものであり、ベルト走行を安定化させることで、ベルトたるみ及びベルトの傷発生を防止するとともに、画像不良の発生低減を防止することを課題とする。 The present invention has been made in view of the above problems, and it is an object of the present invention to prevent belt sagging and belt damage from occurring as well as to prevent occurrence of image defects by stabilizing belt running.

上記課題を解決するための手段として、本発明は以下の特徴を有している。
請求項1に記載の画像形成装置では、中間転写装置を有する画像形成装置において、複数のローラに張架された中間転写ベルトを有し、中間転写ベルトから転写材へ転写する転写位置より手前にて、ベルトと最近接部材との距離についてベルト主走査方向画像範囲外における最近接部材をベルト主走査方向画像範囲内における最近接部材とすることを特徴とする。
請求項2に記載の画像形成装置では、請求項1に記載の画像形成装置において、ベルト主走査方向画像範囲外における最近接部材を、少なくとも前後2ヶ所に設けることを特徴とする。
請求項3に記載の画像形成装置では、請求項1に記載の画像形成装置において、ベルト主走査方向画像範囲外における最近接部材を、スポンジ材にて構成することを特徴とする。
請求項4に記載の画像形成装置では、請求項1に記載の画像形成装置において、ベルト主走査方向画像範囲外における最近接部材を、ブラシ材にて構成することを特徴とする。
As means for solving the above problems, the present invention has the following features.
The image forming apparatus according to claim 1, wherein the image forming apparatus includes an intermediate transfer device, and has an intermediate transfer belt stretched around a plurality of rollers, and is positioned before a transfer position at which the image is transferred from the intermediate transfer belt to the transfer material. Thus, with respect to the distance between the belt and the closest member, the closest member outside the belt main scanning direction image range is the closest member within the belt main scanning direction image range.
The image forming apparatus according to claim 2 is characterized in that in the image forming apparatus according to claim 1, the closest members outside the image range in the belt main scanning direction are provided in at least two front and rear positions.
An image forming apparatus according to a third aspect is the image forming apparatus according to the first aspect, wherein the closest member outside the image range in the belt main scanning direction is formed of a sponge material.
According to a fourth aspect of the present invention, in the image forming apparatus according to the first aspect, the closest member outside the image range in the belt main scanning direction is made of a brush material.

以上説明したように、上記解決するための手段によって、本発明の画像形成装置では、以下のような効果を奏する。
請求項1記載の発明によれば、ベルト走行を安定化させることによって、ベルトの傷付きおよび画像不良の発生低減を防止することができる。
請求項2記載の発明によれば、画像範囲内のベルト上画像が乱れることを防ぐことができる。
請求項3記載の発明によれば、ベルトがたるんで最近接部材に接触した際にも、ベルトを傷付けることを防ぐことができる。
請求項4記載の発明によれば、ベルトの傷付きを防止するとともに、防止するための最近接部材の高寿命化を図ることができる。
As described above, according to the means for solving the above problems, the image forming apparatus of the present invention has the following effects.
According to the first aspect of the present invention, it is possible to prevent the belt from being damaged and the occurrence of image defects from being reduced by stabilizing the belt running.
According to the second aspect of the present invention, the on-belt image within the image range can be prevented from being disturbed.
According to the third aspect of the present invention, it is possible to prevent the belt from being damaged even when the belt sags and comes into contact with the closest member.
According to the fourth aspect of the present invention, it is possible to prevent the belt from being damaged and to increase the life of the closest member for preventing the belt.

図1に、本件請求項1〜4にかかわる画像形成装置構成例1を示し、動作構成について説明する。図中符号100は複写機本体、200はそれを載せる給紙テーブル、300は複写機本体100上に取り付けるスキャナ、400はさらにその上に取り付ける原稿自動搬送装置(ADF)である。 FIG. 1 shows an image forming apparatus configuration example 1 according to claims 1 to 4 of the present invention, and an operation configuration will be described. In the figure, reference numeral 100 is a copying machine main body, 200 is a paper feed table on which it is placed, 300 is a scanner mounted on the copying machine main body 100, and 400 is an automatic document feeder (ADF) further mounted thereon.

複写機本体100には、中央に、無端ベルト状の中間転写体10を設ける。中間転写体10が、本請求項1〜4におけるベルト体に相当する。図1に示すとおり、図示例では3つの支持ローラ14・15・16に掛け回して図中時計回りに回転搬送可能とする。
この図示例では、3つのうち第2の支持ローラ15の左に、画像転写後に中間転写体10上に残留する残留トナーを除去する中間転写体クリーニング装置17を設ける。また、3つのうちの第1の支持ローラ14と第2の支持ローラ15間に張り渡した中間転写体10上には、その搬送方向に沿って、ブラック・シアン・マゼンタ・イエローの4つの画像形成手段18を横に並べて配置してタンデム画像形成装置20を構成する。そのタンデム画像形成装置20の上には、図1に示すように、さらに露光装置21を設ける。
The copying machine main body 100 is provided with an endless belt-shaped intermediate transfer member 10 in the center. The intermediate transfer member 10 corresponds to the belt member in claims 1 to 4. As shown in FIG. 1, in the illustrated example, it is wound around three support rollers 14, 15, and 16 so that it can be rotated and conveyed clockwise in the figure.
In the illustrated example, an intermediate transfer body cleaning device 17 that removes residual toner remaining on the intermediate transfer body 10 after image transfer is provided to the left of the second support roller 15 among the three. Further, four images of black, cyan, magenta, and yellow are formed on the intermediate transfer body 10 stretched between the first support roller 14 and the second support roller 15 among the three along the conveyance direction. The tandem image forming apparatus 20 is configured by arranging the forming units 18 side by side. An exposure device 21 is further provided on the tandem image forming apparatus 20 as shown in FIG.

一方、中間転写体10を挟んでタンデム画像形成装置20と反対の側には、2次転写装置22を備える。2次転写装置22は、図示例では、2つのローラ23間に、無端ベルトである2次転写ベルト24を掛け渡して構成し、中間転写体10を介して第3の支持ローラ16に押し当てて配置し、中間転写体10上の画像をシートに転写する。2次転写装置22の横には、シート上の転写画像を定着する定着装置25を設ける。定着装置25は、無端ベルトである定着ベルト26に加圧ローラ27を押し当てて構成する。上述した2次転写装置22には、画像転写後のシートをこの定着装置25へと搬送するシート搬送機能も備えてなる。もちろん、2次転写装置22として、非接触のチャージャを配置してもよく、そのような場合は、このシート搬送機能を併せて備えることは難しくなる。 On the other hand, a secondary transfer device 22 is provided on the side opposite to the tandem image forming apparatus 20 with the intermediate transfer body 10 interposed therebetween. In the illustrated example, the secondary transfer device 22 is configured by spanning a secondary transfer belt 24, which is an endless belt, between two rollers 23, and is pressed against the third support roller 16 via the intermediate transfer body 10. The image on the intermediate transfer body 10 is transferred to a sheet. A fixing device 25 for fixing the transfer image on the sheet is provided beside the secondary transfer device 22. The fixing device 25 is configured by pressing a pressure roller 27 against a fixing belt 26 that is an endless belt. The secondary transfer device 22 described above is also provided with a sheet transport function for transporting the image-transferred sheet to the fixing device 25. Of course, a non-contact charger may be arranged as the secondary transfer device 22, and in such a case, it is difficult to provide this sheet conveyance function together.

なお、図示例では、このような2次転写装置22および定着装置25の下に、上述したタンデム画像形成装置20と平行に、シートの両面に画像を記録すべくシートを反転するシート反転装置28を備える。   In the illustrated example, a sheet reversing device 28 for reversing the sheet so as to record an image on both sides of the sheet is provided below the secondary transfer device 22 and the fixing device 25 in parallel with the tandem image forming device 20 described above. Is provided.

さて、いまこのカラー複写機を用いてコピーをとるときは、原稿自動搬送装置400の原稿台30上に原稿をセットする。または、原稿自動搬送装置400を開いてスキャナ300のコンタクトガラス32上に原稿をセットし、原稿自動搬送装置400を閉じてそれで押さえる。
そして、不図示のスタートスイッチを押すと、原稿自動搬送装置400に原稿をセットしたときは、原稿を搬送してコンタクトガラス32上へと移動して後、他方コンタクトガラス32上に原稿をセットしたときは、直ちにスキャナ300を駆動し、第1走行体33および第2走行体34を走行する。そして、第1走行体33で光源から光を発射するとともに原稿面からの反射光をさらに反射して第2走行体34に向け、第2走行体34のミラーで反射して結像レンズ35を通して読取りセンサ36に入れ、原稿内容を読み取る。
Now, when making a copy using this color copying machine, a document is set on the document table 30 of the automatic document feeder 400. Alternatively, the automatic document feeder 400 is opened, a document is set on the contact glass 32 of the scanner 300, and the automatic document feeder 400 is closed and pressed by it.
When a start switch (not shown) is pressed, when the document is set on the automatic document feeder 400, the document is transported and moved onto the contact glass 32, and then the document is set on the other contact glass 32. At that time, the scanner 300 is immediately driven to travel the first traveling body 33 and the second traveling body 34. Then, the first traveling body 33 emits light from the light source and further reflects the reflected light from the document surface toward the second traveling body 34 and is reflected by the mirror of the second traveling body 34 and passes through the imaging lens 35. The document is placed in the reading sensor 36 and the original content is read.

また、不図示のスタートスイッチを押すと、不図示の駆動モータで支持ローラ14・15・16の1つを回転駆動して他の2つの支持ローラを従動回転し、中間転写体10を回転搬送する。同時に、個々の画像形成手段18でその感光体40を回転して各感光体40上にそれぞれ、ブラック・イエロ・マゼンタ・シアンの単色画像を形成する。そして、中間転写体10の搬送とともに、それらの単色画像を順次転写して中間転写体10上に合成カラー画像を形成する。 When a start switch (not shown) is pressed, one of the support rollers 14, 15, and 16 is driven to rotate by a drive motor (not shown), and the other two support rollers are driven to rotate to convey the intermediate transfer member 10. To do. At the same time, the individual image forming means 18 rotates the photosensitive member 40 to form black, yellow, magenta, and cyan single-color images on each photosensitive member 40, respectively. Then, along with the conveyance of the intermediate transfer member 10, the single color images are sequentially transferred to form a composite color image on the intermediate transfer member 10.

一方、不図示のスタートスイッチを押すと、給紙テーブル200の給紙ローラ42の1つを選択回転し、ペーパーバンク43に多段に備える給紙カセット44の1つからシートを繰り出し、分離ローラ45で1枚ずつ分離して給紙路46に入れ、搬送ローラ47で搬送して複写機本体100内の給紙路48に導き、レジストローラ49に突き当てて止める。
または、給紙ローラ50を回転して手差しトレイ51上のシートを繰り出し、分離ローラ52で1枚ずつ分離して手差し給紙路53に入れ、同じくレジストローラ49に突き当てて止める。
On the other hand, when a start switch (not shown) is pressed, one of the paper feed rollers 42 of the paper feed table 200 is selectively rotated, and the sheet is fed out from one of the paper feed cassettes 44 provided in multiple stages in the paper bank 43, and the separation roller 45. Then, the sheets are separated one by one into the paper feed path 46, transported by the transport roller 47, guided to the paper feed path 48 in the copying machine main body 100, and abutted against the registration roller 49 and stopped.
Alternatively, the sheet feed roller 50 is rotated to feed out the sheets on the manual feed tray 51, separated one by one by the separation roller 52, put into the manual feed path 53, and abutted against the registration roller 49 and stopped.

そして、中間転写体10上の合成カラー画像にタイミングを合わせてレジストローラ49を回転し、中間転写体10と2次転写装置22との間にシートを送り込み、2次転写装置22で転写してシート上にカラー画像を記録する。
画像転写後のシートは、2次転写装置22で搬送して定着装置25へと送り込み、定着装置25で熱と圧力とを加えて転写画像を定着して後、切換爪55で切り換えて排出ローラ56で排出し、排紙トレイ57上にスタックする。または、切換爪55で切り換えてシート反転装置28に入れ、そこで反転して再び転写位置へと導き、裏面にも画像を記録して後、排出ローラ56で排紙トレイ57上に排出する。
Then, the registration roller 49 is rotated in synchronization with the composite color image on the intermediate transfer member 10, the sheet is fed between the intermediate transfer member 10 and the secondary transfer device 22, and transferred by the secondary transfer device 22. A color image is recorded on the sheet.
The sheet after the image transfer is conveyed by the secondary transfer device 22 and sent to the fixing device 25, and heat and pressure are applied to the fixing device 25 to fix the transferred image. The paper is discharged at 56 and stacked on the paper discharge tray 57. Alternatively, it is switched by the switching claw 55 and put into the sheet reversing device 28, where it is reversed and guided again to the transfer position, and the image is recorded also on the back surface, and then discharged onto the discharge tray 57 by the discharge roller 56.

一方、画像転写後の中間転写体10は、中間転写体クリーニング装置17で、画像転写後に中間転写体10上に残留する残留トナーを除去し、タンデム画像形成装置20による再度の画像形成に備える。 On the other hand, the intermediate transfer body 10 after the image transfer is removed by the intermediate transfer body cleaning device 17 to remove residual toner remaining on the intermediate transfer body 10 after the image transfer, so that the tandem image forming apparatus 20 can prepare for another image formation.

図2を参照して従来例の問題点を説明する。
駆動ローラ14にて駆動された中間転写体10(以下、中間転写ベルト10と表記する)が時計回り方向に回転している。たとえば2次転写部におけるベルト速度がベルトを駆動する駆動ローラの速度よりも遅い場合、2次転写部においてベルトが遅くなるため、この2次転写前にてベルトのたるみが生じ図2のような近接部材(実施例の場合には2次転写前ガイド部材101)にトナー像が接触してしまい、画像こすれ問題として顕在化する。
The problem of the conventional example will be described with reference to FIG.
An intermediate transfer member 10 (hereinafter referred to as an intermediate transfer belt 10) driven by a driving roller 14 rotates in a clockwise direction. For example, when the belt speed in the secondary transfer portion is slower than the speed of the driving roller for driving the belt, the belt becomes slow in the secondary transfer portion, so that the belt sags before this secondary transfer, as shown in FIG. The toner image comes into contact with the proximity member (in the case of the embodiment, the guide member 101 before secondary transfer), which is manifested as an image rubbing problem.

また、ベルトが近接部材に当接することにより、ベルトに傷が発生してしまう場合がある。このたるみに関しては、各ローラの速度差、中間転写ベルトと2次転写ベルト、2次転写ローラ等との速度差がばらつきにより発生した際に発生しやすい。転写材にトナー像を転写するためにベルトに当接する2次転写ローラは本構成例の場合、中抵抗のゴムローラであり、これは温度、湿度により径が変化し、表面速度が変化する場合が多い。 Further, when the belt comes into contact with the proximity member, the belt may be damaged. This sag is likely to occur when the speed difference between the rollers and the speed difference between the intermediate transfer belt, the secondary transfer belt, the secondary transfer roller, and the like are caused by variations. In the case of this configuration example, the secondary transfer roller that contacts the belt for transferring the toner image to the transfer material is a medium resistance rubber roller. This may change the diameter and the surface speed depending on the temperature and humidity. Many.

また、2次転写ベルトを転写装置として使用している場合にても、この2次転写ベルトを駆動している駆動ローラ径は温湿度、加工ばらつきにより変動する。これらの変動により、ベルトと2次転写ローラの速度差はばらつくことになる。ばらつきにより2次転写ローラ表面の速度がベルトよりも遅くなった場合に、ベルトが2次転写前にてたるんでしまうこととなる。 Even when the secondary transfer belt is used as a transfer device, the diameter of the driving roller that drives the secondary transfer belt varies depending on temperature and humidity and processing variations. Due to these fluctuations, the speed difference between the belt and the secondary transfer roller varies. When the speed of the surface of the secondary transfer roller becomes slower than the belt due to the variation, the belt is slackened before the secondary transfer.

請求項1から請求項4の実施例を図3および図4に示す。図3および図4において、スペーサ(最近接部材)120を画像範囲外に設け、中間転写ベルト10がたるんだ際でも2次転写前ガイド部材101が中間転写ベルト10に接触しないように形成している。中間転写ベルト10がたるんだ際に、まずスペーサ120に画像範囲外にて当たり、これに当たることにより中間転写ベルト10が押えられて画像範囲内にて中間転写ベルト10が2次転写前ガイド部材101に当たらないようにすることができる。 Embodiments of claims 1 to 4 are shown in FIGS. 3 and 4, a spacer (closest member) 120 is provided outside the image range so that the secondary transfer guide member 101 does not contact the intermediate transfer belt 10 even when the intermediate transfer belt 10 is slack. Yes. When the intermediate transfer belt 10 sags, it first hits the spacer 120 outside the image range, and by hitting this, the intermediate transfer belt 10 is pressed and within the image range, the intermediate transfer belt 10 is guided before the secondary transfer. Can be avoided.

請求項2においては、このスペーサ120を少なくとも前後2個所に設置することにより、画像範囲内のベルト上画像が乱れることを防ぐことができる。 According to the second aspect of the present invention, it is possible to prevent the on-belt image within the image range from being disturbed by installing the spacers 120 at least at two front and rear positions.

また、請求項3においては、スペーサ120をスポンジ材にて構成している。これにより、ベルトがたるんでスペーサ120に接触した際にも、ベルトを傷付けることを防ぐことができる。 Further, in claim 3, the spacer 120 is made of a sponge material. Thereby, even when the belt is slackened and contacts the spacer 120, the belt can be prevented from being damaged.

また、請求項4においては、スペーサ120をブラシ材にて構成している。これにより、ベルトがたるんでスペーサ120に接触した際にも、ベルトを傷付けることを防ぐことができる。また、スポンジ材よりも当接による磨耗に強いことから、この機能を長く保つことができ、部材の高寿命化を図ることができる。 Moreover, in Claim 4, the spacer 120 is comprised with the brush material. Thereby, even when the belt is slackened and contacts the spacer 120, the belt can be prevented from being damaged. Further, since it is more resistant to wear due to contact than the sponge material, this function can be maintained for a long time, and the life of the member can be increased.

本発明の一実施例を示す画像形成装置の構成概略図である。1 is a schematic configuration diagram of an image forming apparatus showing an embodiment of the present invention. 従来の問題点を示す中間転写体の概略図である。It is the schematic of the intermediate transfer body which shows the conventional trouble. 本発明の一実施例を示す中間転写体の概略図である。1 is a schematic view of an intermediate transfer member showing one embodiment of the present invention. 本発明の一実施例を示す中間転写体の概略図である。1 is a schematic view of an intermediate transfer member showing one embodiment of the present invention.

符号の説明Explanation of symbols

10 中間転写体(中間転写ベルト)
14 第1の支持ローラ
15 第2の支持ローラ
16 第3の支持ローラ
17 中間転写体クリーニング装置
18 画像形成手段
20 タンデム画像形成装置
21 露光装置
22 2次転写装置
23 ローラ
24 2次転写ベルト
25 定着装置
26 定着ベルト
27 加圧ローラ
28 シート反転装置
30 原稿台
30 帯電装置
32 コンタクトガラス
33 第1走行体
34 第2走行体
35 結像レンズ
36 読取りセンサ
40 感光体
42,50 給紙ローラ
43 ペーパーバンク
44 給紙カセット
45 分離ローラ
46 給紙路
47 搬送ローラ
48 給紙路
49 レジストローラ
51 手差しトレイ
52 分離ローラ
53 手差し給紙路
56 排出ローラ
57 排紙トレイ
100 複写機本体
101 2次転写前ガイド部材
120 スペーサ(最近接部材)
200 給紙テーブル
300 スキャナ
400 原稿自動搬送装置
10 Intermediate transfer member (intermediate transfer belt)
14 First support roller 15 Second support roller 16 Third support roller 17 Intermediate transfer member cleaning device 18 Image forming means 20 Tandem image forming device 21 Exposure device 22 Secondary transfer device 23 Roller 24 Secondary transfer belt 25 Fixing Device 26 Fixing belt 27 Pressure roller 28 Sheet reversing device 30 Document table 30 Charging device 32 Contact glass 33 First traveling body 34 Second traveling body 35 Imaging lens 36 Reading sensor 40 Photosensitive body 42, 50 Paper feeding roller 43 Paper bank 44 Paper Feed Cassette 45 Separation Roller 46 Paper Feed Path 47 Transport Roller 48 Paper Feed Path 49 Registration Roller 51 Manual Tray 52 Separation Roller 53 Manual Feed Path 56 Discharge Roller 57 Paper Discharge Tray 100 Copier Main Body 101 Guide Member Before Secondary Transfer 120 Spacer (closest member)
200 Paper feed table 300 Scanner 400 Automatic document feeder

Claims (4)

中間転写装置を有する画像形成装置において、
複数のローラに張架された中間転写ベルトを有し、中間転写ベルトから転写材へ転写する転写位置より手前にて、
ベルトと最近接部材との距離についてベルト主走査方向画像範囲外における最近接部材をベルト主走査方向画像範囲内における最近接部材とする
ことを特徴とする画像形成装置。
In an image forming apparatus having an intermediate transfer device,
It has an intermediate transfer belt stretched around a plurality of rollers, and it is in front of the transfer position for transferring from the intermediate transfer belt to the transfer material.
An image forming apparatus characterized in that the closest member outside the belt main scanning direction image range is the closest member within the belt main scanning direction image range with respect to the distance between the belt and the closest member.
請求項1記載の画像形成装置において、
ベルト主走査方向画像範囲外における最近接部材を、少なくとも前後2ヶ所に設けること
を特徴とする画像形成装置。
The image forming apparatus according to claim 1.
An image forming apparatus characterized in that the closest members outside the image range in the belt main scanning direction are provided in at least two front and rear positions.
請求項1記載の画像形成装置において、
ベルト主走査方向画像範囲外における最近接部材を、スポンジ材にて構成すること
を特徴とする画像形成装置。
The image forming apparatus according to claim 1.
An image forming apparatus characterized in that the closest member outside the image range in the belt main scanning direction is made of a sponge material.
請求項1記載の画像形成装置において、
ベルト主走査方向画像範囲外における最近接部材を、ブラシ材にて構成すること
を特徴とする画像形成装置。
The image forming apparatus according to claim 1.
An image forming apparatus, wherein a closest member outside an image range in a belt main scanning direction is formed of a brush material.
JP2004378868A 2004-12-28 2004-12-28 Image forming apparatus Expired - Fee Related JP4536509B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008225306A (en) * 2007-03-15 2008-09-25 Kyocera Mita Corp Image forming apparatus
JP2009294529A (en) * 2008-06-06 2009-12-17 Ricoh Co Ltd Image forming apparatus
JP2011237735A (en) * 2010-05-13 2011-11-24 Konica Minolta Business Technologies Inc Image forming apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01162645A (en) * 1987-12-17 1989-06-27 Canon Inc Image forming device
JP2000105493A (en) * 1998-09-30 2000-04-11 Ricoh Co Ltd Image forming device
JP2000214693A (en) * 1999-01-21 2000-08-04 Ricoh Co Ltd Image forming device
JP2001341883A (en) * 2000-05-31 2001-12-11 Canon Inc Image forming device
JP2003280402A (en) * 2002-03-20 2003-10-02 Ricoh Co Ltd Image forming apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01162645A (en) * 1987-12-17 1989-06-27 Canon Inc Image forming device
JP2000105493A (en) * 1998-09-30 2000-04-11 Ricoh Co Ltd Image forming device
JP2000214693A (en) * 1999-01-21 2000-08-04 Ricoh Co Ltd Image forming device
JP2001341883A (en) * 2000-05-31 2001-12-11 Canon Inc Image forming device
JP2003280402A (en) * 2002-03-20 2003-10-02 Ricoh Co Ltd Image forming apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008225306A (en) * 2007-03-15 2008-09-25 Kyocera Mita Corp Image forming apparatus
JP2009294529A (en) * 2008-06-06 2009-12-17 Ricoh Co Ltd Image forming apparatus
JP2011237735A (en) * 2010-05-13 2011-11-24 Konica Minolta Business Technologies Inc Image forming apparatus

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