JP2003122140A - Image forming apparatus - Google Patents
Image forming apparatusInfo
- Publication number
- JP2003122140A JP2003122140A JP2001316160A JP2001316160A JP2003122140A JP 2003122140 A JP2003122140 A JP 2003122140A JP 2001316160 A JP2001316160 A JP 2001316160A JP 2001316160 A JP2001316160 A JP 2001316160A JP 2003122140 A JP2003122140 A JP 2003122140A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- transfer material
- conductive
- image forming
- forming apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Control Or Security For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複写機、プリンタ
用として、且つ印刷用の刷版作製用として、兼用して使
用することができる画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus which can be used both as a copying machine and a printer and also as a plate for printing.
【０００２】[0002]
【従来の技術】従来より、電子写真方式を利用した種々
の装置が知られるが、中でも代表的には、普通紙やフィ
ルムといった通常の転写材上に画像を複写またはプリン
トする、いわゆる複写機、プリンターといった画像形成
装置が良く知られている。このような画像形成装置で
は、アルミニウム等よりなるドラム状のまたはベルト状
の導電性基体の表面に有機光半導体（ＯＰＣ）等の光導
電層を塗布または蒸着により設けた感光体を用い、この
感光体表面上に周知の電子写真方式を用いて静電潜像を
形成し、この静電潜像にトナーを付着させることにより
可視トナー像を形成し、次にこのトナー像を、転写部に
おいて紙、フィルム、第二原図といった通常の転写材上
に転写している。2. Description of the Related Art Conventionally, various devices utilizing an electrophotographic method are known, but among them, a so-called copying machine for copying or printing an image on a normal transfer material such as plain paper or film is typical. Image forming apparatuses such as printers are well known. In such an image forming apparatus, a photoconductor in which a photoconductive layer such as an organic photo semiconductor (OPC) is provided on the surface of a drum-shaped or belt-shaped conductive substrate made of aluminum or the like by coating or vapor deposition is used. An electrostatic latent image is formed on the body surface by using a well-known electrophotographic method, and a toner is attached to the electrostatic latent image to form a visible toner image. , A film, a second original drawing, etc.
【０００３】かかる転写は、通常、トナー像を形成した
感光体の表面に対し、転写材を密着するように送り、こ
の密着した部分において、転写材の背面側からコロナ帯
電器や帯電ローラといった周知の手段によって転写バイ
アスを印加し、感光体上のトナーを転写材側へ静電吸着
させることにより行うものである。In such transfer, usually, a transfer material is sent so as to be in close contact with the surface of a photoreceptor on which a toner image is formed, and at the contacted portion, a corona charger, a charging roller or the like is known from the back side of the transfer material. The transfer bias is applied by the means to electrostatically attract the toner on the photoconductor to the transfer material side.
【０００４】一方、先頃の印刷業界においては、印刷原
稿をデジタルデータとして作成し、このデータを電子組
板装置（ＤＴＰ）で直接読み込んでデスクトップ上で再
現し、必要な処理や編集を行っている。デスクトップ上
で編集したデータは、ネットワークラインで製版機に転
送され、網点データとして所定の枚数のフィルム上に焼
き付けられて出力される。このフィルムは、刷版、例え
ばＰＳ版（感光層を備えた板）等の上に焼き付けられ
て、オフセット輪転機等の印刷機の版として印刷機にセ
ットして用いられる。On the other hand, in the recent printing industry, a print manuscript is created as digital data, and this data is directly read by an electronic plywood machine (DTP) and reproduced on a desktop to perform necessary processing and editing. . The data edited on the desktop is transferred to the plate-making machine through the network line, printed on a predetermined number of films as halftone dot data, and output. This film is printed on a printing plate, for example, a PS plate (a plate provided with a photosensitive layer) or the like, and is set in a printing machine as a plate of a printing machine such as an offset rotary press.
【０００５】[0005]
【発明が解決しようとする課題】ところで上記刷版の作
製は、従来にあっては、第一段階としてのデータのフィ
ルムへの焼き付けや、その後の刷版工程において、露
光、現像、洗浄、消去、バーニング等の多くの煩わしい
工程を必要とし、これらを行うにおいては作業に手慣れ
た作業者が必要とされる。By the way, the above-mentioned plate making has hitherto been carried out by printing data on a film as a first step and then exposing, developing, washing and erasing in the plate making process. However, many troublesome steps such as burning are required, and an operator who is familiar with the work is required to perform these steps.
【０００６】本発明者らは、導電性または半導電性の転
写材を用いた刷版を上記した電子写真方式を利用した画
像形成装置で行うことに着目した。The present inventors have paid attention to performing a printing plate using a conductive or semi-conductive transfer material in the image forming apparatus using the electrophotographic method.
【０００７】しかし、上記したような構成による電子写
真方式用いた画像形成装置によって印刷版を製作しよう
とする場合には、複写機やプリンタにおいて使用する紙
やフィルム等の電気抵抗の高い転写材（以下、通常転写
材といい、本明細書においては絶縁性の転写材として取
り扱う。）のための転写帯電付与条件と同一の条件で、
ＰＳ版のような導電性または半導電性の転写材上に転写
を行った場合には、紙等の転写材で得られる鮮明な画像
を得ることが困難であった。However, when a printing plate is to be manufactured by the image forming apparatus using the electrophotographic system having the above-mentioned structure, a transfer material having a high electric resistance (such as paper or film used in a copying machine or a printer). Hereinafter, it is usually referred to as a transfer material, and is treated as an insulating transfer material in the present specification.)
When transfer is performed on a conductive or semi-conductive transfer material such as a PS plate, it is difficult to obtain a clear image obtained with a transfer material such as paper.
【０００８】そこで、本発明者らは、従来使用していた
紙、フィルム等の電気抵抗が高い通常転写材を、導電性
または半導電性の転写材、例えばＰＳ版等に置き換え
て、印刷用の刷版作製の装置としても使用することがで
き、十分な画像精度が得られ且つ鮮明な画像を形成する
ことができる画像形成装置を簡単な構成で提供すること
を課題とする。Therefore, the inventors of the present invention replaced the conventional transfer material having high electric resistance, such as paper and film, which has been conventionally used, with a conductive or semi-conductive transfer material, for example, a PS plate, for printing. It is an object of the present invention to provide an image forming apparatus having a simple configuration, which can be used also as an apparatus for producing a printing plate, can obtain a sufficient image accuracy, and can form a clear image.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するた
め、転写材を像担持体に接触するように供給し、前記転
写材の背面からバイアスを印加する転写部を備えた画像
形成装置において、前記転写部は、前記転写材の電気的
性質に応じて切り替え可能な２種類の転写手段を有する
ことを特徴とする。In order to solve the above problems, in an image forming apparatus provided with a transfer portion for supplying a transfer material so as to contact an image carrier and applying a bias from the back surface of the transfer material, The transfer section has two kinds of transfer means that can be switched according to the electrical property of the transfer material.
【００１０】さらには、前記転写材として、導電性また
は半導電性及び絶縁性の２種類の転写材を使用可能とす
ることを特徴とする。Further, it is characterized in that it is possible to use, as the transfer material, two kinds of transfer materials of conductive type, semiconductive type and insulating type.
【００１１】またさらに、前記転写部は前記像担持体に
対向する第一の転写手段と、前記転写材の搬送方向から
みて前記第一の転写手段の上流及び下流位置にそれぞれ
設けられた対の電極からなる第二の転写手段とを有する
ことを特徴とし、特には、前記第二の転写手段は、前記
第一の転写手段に比べ低い転写バイアスが印加されてい
ることを特徴とする。Further, the transfer portion is composed of a first transfer means facing the image carrier and a pair of upstream and downstream positions of the first transfer means as viewed from the transfer direction of the transfer material. It is characterized by having a second transfer means composed of an electrode, and in particular, the second transfer means is characterized in that a transfer bias lower than that of the first transfer means is applied.
【００１２】また特には、前記転写材が導電性または半
導電性であるときに、第二の転写手段を付勢し、前記転
写材が絶縁性であるときに、前記第一の転写手段を付勢
するように作動する切り替え手段を有することを特徴と
する。Further, in particular, when the transfer material is conductive or semi-conductive, the second transfer means is energized, and when the transfer material is insulative, the first transfer means is activated. It is characterized in that it has a switching means that operates to be biased.
【００１３】特には、前記導電性転写材は、前記像担持
体及び前記２つの電極以外の部材とは電気的に絶縁され
ていることを特徴とする。In particular, the conductive transfer material is electrically insulated from members other than the image carrier and the two electrodes.
【００１４】[0014]
【発明の実施の形態】この発明の好適な実施例を図面に
基づいて説明する。なお、以下の例では、導電性または
半導電性の転写材（以下、特殊転写材とする。）につい
て説明するが、特殊転写材としては、ＰＳ版等、他の種
類の導電性または半導電性の部材に対しても本発明は適
用することができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. In the following examples, a conductive or semi-conductive transfer material (hereinafter, referred to as a special transfer material) will be described. As the special transfer material, other types of conductive or semi-conductive materials such as PS plates can be used. The present invention can also be applied to a flexible member.
【００１５】図１及び図２はそれぞれ本発明による画像
形成装置のトナー像を転写材上に転写するための転写部
周辺を示す図であり、図１は特殊転写材への転写の場
合、図２は電気抵抗が高い通常転写材への転写の場合の
それぞれの転写時の状態を示す。FIGS. 1 and 2 are views showing the periphery of a transfer portion for transferring a toner image of an image forming apparatus according to the present invention onto a transfer material. FIG. 1 shows a case of transfer to a special transfer material. Reference numeral 2 shows the respective transfer states in the case of transfer to a normal transfer material having a high electric resistance.
【００１６】なお、上記したように、図１に示す例にお
いては、特殊転写材として、アルミニウムからなる導電
性の基板上に親水性の層を設けた、または基板の表面を
親水性を有するように表面処理を施した転写材を使用し
た場合を示す。As described above, in the example shown in FIG. 1, as the special transfer material, a hydrophilic layer is provided on a conductive substrate made of aluminum, or the surface of the substrate is made hydrophilic. The case where a transfer material whose surface is subjected to is used is shown.
【００１７】それぞれ、転写材の供給方向（流れ）に従
って、その搬送路及び転写部を構成する各構成部分につ
いて説明する。図中１は、像担持体として使用すること
ができる、アルミニウム等の金属よりなる基体の表面に
銅フタロシアニン系等の有機光導体またはセレン系等の
無機光導体からなる感光層が塗布または蒸着された電子
写真感光体であり、矢印Ａ方向に回転する。この例では
感光体１はドラム形状よりなるが、無端のベルト形状で
あっても良い。The constituent parts of the transfer path and the transfer section will be described in accordance with the transfer material supply direction (flow). In the figure, reference numeral 1 denotes a photosensitive layer made of an organic photoconductor such as copper phthalocyanine or an inorganic photoconductor such as selenium which is applied or vapor-deposited on the surface of a substrate made of metal such as aluminum which can be used as an image carrier. The electrophotographic photosensitive member rotates in the direction of arrow A. In this example, the photoconductor 1 has a drum shape, but may have an endless belt shape.
【００１８】図示しないが、感光体１の周囲にはその回
転方向Ａに従って、感光体１を静電気的に中和するため
のイレーサーランプ等の除電器、感光体１の表面を特定
極性で一様に帯電するためのコロナまたは帯電ローラ等
の帯電器、帯電された感光体１の表面に所望の静電潜像
を形成するためにレーザーまたはＬＥＤ等により光情報
を露光する露光装置、感光体１の表面に荷電粉末である
トナー粉体を供給して感光体１に形成された前記静電潜
像を現像してトナー粉体像を形成するための現像器を、
順に設けており、これらは感光体１の回転に従って順に
感光体１に対して作用する。これら感光体１及びその周
囲の上記した装置としては、周知の電子写真方式を利用
した像形成装置の各部分の構成を適用することができ
る。この例ではトナー粉体として、親油性のトナーが使
用される。Although not shown, a static eliminator such as an eraser lamp for electrostatically neutralizing the photoconductor 1 is provided around the photoconductor 1 according to the rotation direction A thereof, and the surface of the photoconductor 1 is made uniform with a specific polarity. A charging device such as a corona or a charging roller for charging the surface, an exposure device that exposes optical information with a laser, an LED or the like to form a desired electrostatic latent image on the surface of the charged photoreceptor 1, the photoreceptor 1. A developing device for supplying a toner powder, which is a charged powder, to the surface of the toner to develop the electrostatic latent image formed on the photoconductor 1 to form a toner powder image,
They are provided in order, and these sequentially act on the photoconductor 1 as the photoconductor 1 rotates. As the photoconductor 1 and the above-mentioned devices around the photoconductor 1, the configuration of each part of an image forming apparatus using a well-known electrophotographic method can be applied. In this example, lipophilic toner is used as the toner powder.
【００１９】図中２は、不図示の転写材供給源から搬送
されてくる転写材をその上面に沿って転写部７へと案内
するためのガイドであり、このガイド２の下流にはさら
に転写材の下方への落下を防止するための予備ガイド３
が設けられている。転写部７は、基本的に、転写材の性
質に応じて、即ち、転写材が特殊転写材であるか、また
は通常転写材であるか否かに応じて、切り替え可能な２
種類の転写手段を有している。図中４は、一方の転写手
段である特殊転写材への転写のために用いられる第一の
電極である電極部材であり、導電性部材により構成さ
れ、転写部７の転写材の搬送方向（Ｂ方向）からみて上
流に位置している。Reference numeral 2 in the drawing is a guide for guiding the transfer material conveyed from a transfer material supply source (not shown) to the transfer portion 7 along the upper surface thereof, and further downstream of the guide 2, transfer is performed. Preliminary guide 3 to prevent the material from falling down
Is provided. The transfer unit 7 is basically switchable depending on the properties of the transfer material, that is, whether the transfer material is a special transfer material or a normal transfer material.
It has different types of transfer means. Reference numeral 4 in the drawing denotes an electrode member which is a first electrode used for transfer to a special transfer material which is one transfer means, and is composed of a conductive member, and is in the transfer direction of the transfer material of the transfer portion 7 ( It is located upstream when viewed from the B direction).
【００２０】次いで、図中５，６は、通常転写材へのト
ナー像の転写を行うための転写コロナ放電器、及び感光
体１からの転写材の分離手段としての分離コロナ放電器
である。別の転写手段及び分離手段として、導電性ロー
ラにそれぞれ必要なバイアスを印加させた帯電ローラを
用いてもよい。図中８は、感光体１から分離された静電
潜像が転写された転写材を不図示の定着装置へと搬送す
るための手段である搬送ベルト９を支持する一方の搬送
ローラであり、特殊転写材への転写のための第二の電極
という役割ももっており、導電性部材により構成され
る。Next, reference numerals 5 and 6 in the drawing are a transfer corona discharger for transferring a toner image onto a normal transfer material and a separation corona discharger as a means for separating the transfer material from the photoconductor 1. As another transfer unit and separation unit, a charging roller in which a conductive roller is applied with a necessary bias may be used. In the figure, reference numeral 8 denotes one of the carrying rollers that supports a carrying belt 9 that is a means for carrying the transfer material, on which the electrostatic latent image separated from the photoconductor 1 is transferred, to a fixing device (not shown). It also has a role of a second electrode for transfer to a special transfer material, and is composed of a conductive member.
【００２１】なお、上記したように、本発明は、転写部
７の転写コロナ放電器５及び分離コロナ放電器６を跨ぐ
ように、転写材の搬送方向（Ｂ方向）からみてこれら放
電器５，６の上流と下流に、それぞれ、導電性部材より
なる第一及び第二の電極部材４，８を設ける構成として
おり、特殊転写材は、これら２つの電極部材４，８によ
りコロナ放電器を跨ぐようにして支持されて感光体表面
に適度な圧力で接するように供給される。As described above, according to the present invention, the discharger 5 and the separation corona discharger 6 of the transfer unit 7 are arranged so as to straddle the transfer corona discharger 5 and the separation corona discharger 6 when viewed from the transfer material conveying direction (direction B). First and second electrode members 4 and 8 made of a conductive member are provided upstream and downstream of 6, respectively, and the special transfer material straddles the corona discharger by these two electrode members 4 and 8. It is thus supported and supplied so as to come into contact with the surface of the photoconductor at an appropriate pressure.
【００２２】特に第一の電極部材４の配置位置は重要
で、搬送されてくる転写材が確実に感光体１の表面に接
触するような位置であることが好ましい。このため、第
一の電極部材４は転写コロナ放電器４の近傍に設けら
れ、実施例中においては、第一の電極部材４を転写コロ
ナ放電器５のコロナハウジングの転写材の挿入側の外壁
５ｂに互いに電気的に絶縁するようにして適当な絶縁部
材を介して接着等により支持するように設けたが、コロ
ナハウジングから離した位置に設けても良く、又同様
に、第二の電極として搬送ベルト９の支持ローラとを兼
用させる構成としているが、第二の電極を搬送ローラ８
とは離して別に構成しても良く、その場合、第二の電極
はローラ形状に限定される必要はない。The position of the first electrode member 4 is particularly important, and it is preferable that the transferred transfer material is surely brought into contact with the surface of the photosensitive member 1. Therefore, the first electrode member 4 is provided in the vicinity of the transfer corona discharger 4, and in the embodiment, the first electrode member 4 is provided on the outer wall of the transfer corona discharger 5 on the insertion side of the transfer material of the corona housing. 5b is provided so as to be electrically insulated from each other through an appropriate insulating member so as to be supported by adhesion or the like, but may be provided at a position separated from the corona housing, and similarly, as a second electrode. Although it is configured to also serve as a support roller for the transport belt 9, the second electrode is used as the transport roller 8.
Alternatively, the second electrode need not be limited to a roller shape.
【００２３】本発明において特殊転写材の代表的なもの
の一つとして用いられる転写材は、アルミニウム等より
なる導電性の０．１〜０．５mmの厚みの基板上に親水性
の層を設け、または前記基板を親水性となるように表面
処理を施した構成であるが、これ以外でもコシを持たせ
た導電性または半導電性の電気抵抗が低い部材を用いて
もよい。The transfer material used as one of the typical ones of the special transfer materials in the present invention is such that a hydrophilic layer is provided on a conductive substrate made of aluminum or the like and having a thickness of 0.1 to 0.5 mm, Alternatively, the substrate is surface-treated so as to be hydrophilic, but a conductive or semi-conductive member having a low electric resistance may be used instead.
【００２４】次に、第一の転写手段である転写コロナ放
電器５と、第二の転写手段である第一の電極である電極
板４、第二の電極である搬送ローラ８との転写材の性質
に応じた作動のオンオフの切り替えについて説明する。
なお、分離コロナ放電器６は、転写コロナ放電器５と実
施的に同じタイミングでオンオフするために、転写コロ
ナ放電器５と共に、分離コロナ放電器６の電源のオンオ
フについても説明する。Next, a transfer material including the transfer corona discharger 5 which is the first transfer means, the electrode plate 4 which is the first electrode which is the second transfer means, and the conveying roller 8 which is the second electrode. The on / off switching of the operation according to the property of will be described.
Since the separation corona discharger 6 is turned on / off at substantially the same timing as the transfer corona discharger 5, turning on / off of the power supply of the separation corona discharger 6 together with the transfer corona discharger 5 will be described.
【００２５】まず、第二の転写手段の一方の電極を構成
する第一の電極部材である電極板４は、スイッチ１０を
介してトナー像の極性とは逆極性の直流電源２０に電気
的に連結されており、同様に転写コロナ放電器５のコロ
ナ電極５ａは、スイッチ１１を介してトナー像の極性と
は逆極性の直流電源２１に連結されている。また、分離
コロナ放電器６のコロナ電極６ａは、スイッチ１２を介
して交流電源２２に連結されている。同様に、第二の転
写手段の他方の電極を構成する第二の電極部材である搬
送ローラ８は、スイッチ１３を介してトナー像の極性と
は逆極性の直流電源２３に連結されている。First, the electrode plate 4, which is the first electrode member constituting one electrode of the second transfer means, is electrically connected to the DC power source 20 having a polarity opposite to that of the toner image through the switch 10. Similarly, the corona electrode 5a of the transfer corona discharger 5 is connected via the switch 11 to the DC power source 21 having a polarity opposite to that of the toner image. Further, the corona electrode 6 a of the separation corona discharger 6 is connected to the AC power supply 22 via the switch 12. Similarly, the transport roller 8 that is the second electrode member that constitutes the other electrode of the second transfer unit is connected via the switch 13 to the DC power supply 23 having the opposite polarity to the polarity of the toner image.
【００２６】なお、第一及び第二の電極部材４，８を電
源２０，２３に連結するためのスイッチ１０，１３はそ
れぞれ、協働して作用することができるように、連動し
たタイミングでオンオフされ、また転写コロナ放電器５
及び分離コロナ放電器６との関係においては、スイッチ
１０，１３がオンの状態の時には、スイッチ１１，１２
がオフとなり、スイッチ１０，１３がオフの状態の時に
は、スイッチ１１，１２がオンとなるように設定されて
いる。なお、スイッチ１０、１３は転写材が導電性また
は半導電性である場合にオンされ、スイッチ１１，１２
は転写材が紙などの高い電気抵抗を持つ通常転写材の場
合にオンされる。The switches 10 and 13 for connecting the first and second electrode members 4 and 8 to the power sources 20 and 23 are turned on and off at interlocking timings so that they can work together. Transferred corona discharger 5
In relation to the separate corona discharger 6, when the switches 10 and 13 are in the ON state, the switches 11 and 12 are
Is turned off, and when the switches 10 and 13 are off, the switches 11 and 12 are set to be turned on. The switches 10 and 13 are turned on when the transfer material is conductive or semiconductive, and the switches 11 and 12 are turned on.
Is turned on when the transfer material is a normal transfer material having high electric resistance such as paper.
【００２７】また、転写部７の周辺で転写材を搬送する
ために転写材と接触する構成体、例えばガイド２及び予
備ガイド３等の、第一の電極である電極板４及び第二の
電極である搬送ローラ８及び感光体１以外の部品は、電
気的に完全に絶縁され、または、バリスタ等を介するこ
とにより接地に対して電気的に浮いた状態とされてい
る。Also, the electrode plate 4 and the second electrode, which are the first electrodes, of the components that come into contact with the transfer material in order to convey the transfer material around the transfer portion 7, for example, the guide 2 and the preliminary guide 3. The parts other than the transport roller 8 and the photoconductor 1 are electrically completely insulated, or are electrically floated with respect to the ground through a varistor or the like.
【００２８】次に、本実施例の転写材として特殊転写材
を用いた場合の図１について、並びに通常転写材を用い
た場合の図２について、本発明による装置の動作、特に
各スイッチ１０〜１３のオンオフを交えて、更に詳しく
説明する。まず、特殊転写材１４を不図示の給紙ガイド
により手差しまたは自動送り込みにより画像形成装置内
に挿入する。挿入された特殊転写材１４は搬送ガイド２
及び予備ガイド３によって感光体１の転写部７に向けて
搬送され、第一の電極である電極板４、転写コロナ放電
器５、分離コロナ放電器６を通り、第二の電極部材であ
る支持ローラ８を介して搬送ベルト９に送られて、図示
しない定着装置を経て、装置外へと排出される。Next, with respect to FIG. 1 when a special transfer material is used as the transfer material of this embodiment, and FIG. 2 when a normal transfer material is used, the operation of the apparatus according to the present invention, particularly each switch 10 It will be described in more detail with 13 on and off. First, the special transfer material 14 is inserted into the image forming apparatus by manual feeding or automatic feeding by a paper feeding guide (not shown). The inserted special transfer material 14 is the conveyance guide 2
And is conveyed toward the transfer portion 7 of the photoconductor 1 by the preliminary guide 3, passes through the electrode plate 4 which is the first electrode, the transfer corona discharger 5 and the separation corona discharger 6, and is the support which is the second electrode member. It is sent to the conveyor belt 9 via the roller 8, passes through a fixing device (not shown), and is discharged to the outside of the device.
【００２９】転写部７の通過時に特殊転写材１４は、そ
の表面が感光体１の表面に対して適当な圧力で接触する
ように第一の電極部材４と第二の電極部材８の２つの電
極によってその背面を支持され、このとき、第一の電極
部材４と第二の電極部材８のそれぞれのスイッチ１０、
１３はオンとされており、それぞれの電源２０、２３か
ら、特殊転写材への転写に好適な値の転写バイアスが印
可される。なお、このとき、転写部７の転写コロナ放電
器５、分離コロナ放電器６のそれぞれのスイッチ１１，
１２はオフされた状態とされている。また、上記したよ
うに転写部７等を含む特殊転写材１４を搬送する搬送路
を構成する各部品との電気的関係は全て絶縁化され、即
ち電気的浮いており、転写コロナ放電器５のコロナハウ
ジングにかかるように設けられた電極板（第一の電極部
材）４と搬送ローラ８を特殊転写材１４の背面が摺擦す
ることによって、特殊転写材１４にバイアスを印加さ
せ、特殊転写材１４へのトナー像の転写を行うことがで
きる。なお、第一の電極部材４及び第２の電極部材８へ
のバイアスの印可は、ほぼ同じ大きさの電圧とし、ま
た、場合においては、第一または第２の電極部材のいず
れか一方のみにバイアスを印可する構成であっても良
い。When the special transfer material 14 passes through the transfer portion 7, the two surfaces of the first electrode member 4 and the second electrode member 8 are arranged so that the surface of the special transfer material 14 contacts the surface of the photoconductor 1 with an appropriate pressure. The back surface is supported by the electrodes, and at this time, the respective switches 10 of the first electrode member 4 and the second electrode member 8,
13 is turned on, and a transfer bias having a value suitable for transfer to the special transfer material is applied from the respective power supplies 20 and 23. At this time, the switches 11 of the transfer corona discharger 5 and the separation corona discharger 6 of the transfer unit 7,
12 is turned off. Further, as described above, all the electrical relationships with the respective parts constituting the transport path for transporting the special transfer material 14 including the transfer portion 7 etc. are insulated, that is, electrically floating, and the transfer corona discharger 5 has The back surface of the special transfer material 14 rubs the electrode plate (first electrode member) 4 and the conveying roller 8 provided so as to cover the corona housing, so that a bias is applied to the special transfer material 14 and the special transfer material 14 is applied. The transfer of the toner image to 14 can be performed. The bias is applied to the first electrode member 4 and the second electrode member 8 at substantially the same voltage, and in some cases, only one of the first and second electrode members is applied. The bias may be applied.
【００３０】本実施例の構成において、転写コロナ放電
器５と分離コロナ放電器６のスイッチ１１，１２をそれ
ぞれ切った状態で、第一の電極部材４及び第二の電極部
材８のスイッチ１０，１３をオンとし、感光体１と特殊
転写材１４間に印加させるバイアスの値を段階的に変更
して転写を実験したところ、例えば、感光体１の表面電
位が−７５０〜−８５０Ｖ、トナーの極性をマイナスと
した場合、特殊転写材へのバイアス電圧を＋５０Ｖ〜２
５０Ｖの範囲、好ましくは＋１５０Ｖ〜＋２００Ｖの範
囲の値として特殊転写材１４への転写を行ったところ、
精密且つ鮮明な印刷用の版として十分に使用可能な好ま
しい画像を得ることができた。In the configuration of this embodiment, the switches 11 and 12 of the transfer corona discharger 5 and the separation corona discharger 6 are turned off, and the switches 10 and 10 of the first electrode member 4 and the second electrode member 8 are 13 was turned on, and the value of the bias applied between the photoconductor 1 and the special transfer material 14 was changed stepwise, and an experiment of transfer was performed. For example, the surface potential of the photoconductor 1 was -750 to -850 V, When the polarity is negative, the bias voltage to the special transfer material is + 50V ~ 2
When the transfer to the special transfer material 14 was performed with a value in the range of 50V, preferably in the range of + 150V to + 200V,
It was possible to obtain a preferable image that was sufficiently usable as a printing plate for precise and clear printing.
【００３１】なお、感光体１と特殊転写材１４間に印加
させるバイアスについては、トナー極性とは逆極性が好
ましく、ＤＣ２５０Ｖ以上のバイアスを印加すると感光
体１表面と特殊転写材１４間に放電が発生し画像が不鮮
明となり、また５０Ｖ以下のバイアスを印加した場合で
は転写効率が悪くなる傾向がある。The bias applied between the photoconductor 1 and the special transfer material 14 is preferably opposite to the polarity of the toner. When a bias of 250 VDC or more is applied, a discharge is generated between the surface of the photoconductor 1 and the special transfer material 14. The generated image becomes unclear, and the transfer efficiency tends to deteriorate when a bias of 50 V or less is applied.
【００３２】次に、転写材として通常転写材を用いた本
実施例２の図２について説明する。まず、通常転写材で
ある紙またはフィルム１５を実施例１の場合と同様、不
図示の給紙部または給紙ガイドにより装置内に挿入す
る。挿入された紙またはフィルム１５は搬送ガイド２及
び予備ガイド３によって感光体１の転写部７に向けて搬
送され、第一の電極である電極板４、転写コロナ５、分
離コロナ６、第二の電極８を通り、搬送ベルト９に送ら
れて、不図示の定着装置を経て、装置外へと排出され
る。Next, FIG. 2 of the second embodiment in which a normal transfer material is used as the transfer material will be described. First, the paper or film 15, which is a normal transfer material, is inserted into the apparatus by a paper feed unit or a paper feed guide (not shown) as in the first embodiment. The inserted paper or film 15 is conveyed toward the transfer portion 7 of the photoconductor 1 by the conveyance guide 2 and the preliminary guide 3, and the electrode plate 4, which is the first electrode, the transfer corona 5, the separation corona 6, and the second It is sent to the conveyor belt 9 through the electrode 8, passes through a fixing device (not shown), and is discharged to the outside of the device.
【００３３】このとき、転写部７等を含む通常転写材で
ある紙１５を搬送する搬送路は、実施例１の場合とは逆
に、転写コロナ５、分離コロナ６のそれぞれのスイッチ
１１，１２をオンの状態とし、第一及び第二の電極部材
である電極板４と搬送ローラ８のそれぞれのスイッチ１
０，１３をオフの状態とし、転写コロナ５には電極板４
及び搬送ローラ８に印加されるバイアスよりも一桁高い
高圧のバイアスが印加される。なお、電極板４と搬送ロ
ーラ８のスイッチについては、場合によってはオフとす
ることなく、オンの状態でもよい。At this time, the transport path for transporting the paper 15, which is a normal transfer material, including the transfer section 7 and the like is opposite to the case of the first embodiment, the switches 11, 12 for the transfer corona 5 and the separation corona 6, respectively. Is turned on, and the switches 1 for the electrode plate 4 and the transport roller 8 which are the first and second electrode members, respectively.
0 and 13 are turned off, and the electrode plate 4 is attached to the transfer corona 5.
A high-voltage bias that is one digit higher than the bias applied to the transport roller 8 is applied. The switches for the electrode plate 4 and the transport roller 8 may be turned on instead of being turned off in some cases.
【００３４】本実施例２においては、転写コロナ放電器
５と分離コロナ放電器６のスイッチ１１，１２をそれぞ
れオンの状態とし、第一及び第二の電極部材である電極
板４と搬送ローラ８のそれぞれのスイッチ１０，１３を
オフの状態にして、例えば感光体１の表面電位を−７５
０Ｖ〜−８５０Ｖ、トナーの極性をマイナスとし、転写
コロナ５にはＤＣ＋６０００Ｖ、分離コロナ６にはＡＣ
７０００Ｖのバイアスを印加し、転写材へのトナー像の
転写を行ったところ、複写機またはプリンタとして、十
分に鮮明な好ましい画像を得ることができた。In the second embodiment, the switches 11 and 12 of the transfer corona discharger 5 and the separation corona discharger 6 are turned on, respectively, and the electrode plate 4 as the first and second electrode members and the conveying roller 8 are provided. When the respective switches 10 and 13 are turned off, the surface potential of the photoconductor 1 is set to -75, for example.
0V to -850V, negative polarity of toner, DC + 6000V for transfer corona 5 and AC for separation corona 6
When a bias of 7,000 V was applied and the toner image was transferred onto the transfer material, a sufficiently clear and preferable image could be obtained as a copying machine or a printer.
【００３５】[0035]
【発明の効果】本発明の画像形成装置は、転写材の性質
に応じて好適な２つの転写手段を設け、第１及び第２の
転写手段のオンオフを行うスイッチを切り替えることに
よって、紙等の転写材においても、また、印刷用の刷版
用としての導電性または半導電性の転写材においても良
好な転写を得ることができ、且つ簡単な構成としたの
で、コストダウンを図ることができる。The image forming apparatus of the present invention is provided with two transfer means suitable for the property of the transfer material, and switches the first and second transfer means to turn on / off the paper, so Good transfer can be obtained not only in the transfer material but also in the conductive or semiconductive transfer material for the printing plate for printing, and the cost can be reduced because of the simple structure. .
【図１】 本発明によるＰＳ版を転写材とした場合の画
像形成装置の状態を示す概略側断面図。FIG. 1 is a schematic side sectional view showing a state of an image forming apparatus when a PS plate according to the present invention is used as a transfer material.
【図２】 本発明による紙等を転写材とした場合の画像
形成装置の状態を示す概略側断面図。FIG. 2 is a schematic side sectional view showing a state of the image forming apparatus when paper or the like according to the present invention is used as a transfer material.
１ 感光体（像担持体） ２ ガイド ３ 予備ガイド ４ 電極板 （第二の転写手段の第一の電極部材） ５ 転写コロナ放電器 （第一の転写手段） ６ 分離コロナ放電器 ７ 転写部 ８ 搬送ローラ （第二の転写手段の第一の電極部材） ９ 搬送ベルト １０ スイッチ １１ スイッチ １２ スイッチ １３ スイッチ １４ 特殊転写材 １５ 通常転写材 1 photoconductor (image carrier) 2 guides 3 preliminary guide 4 electrode plate (first electrode member of second transfer means) 5 Transfer corona discharger (first transfer means) 6 Separation corona discharger 7 Transfer part 8 Conveyor roller (first electrode member of second transfer means) 9 Conveyor belt 10 switches 11 switch 12 switches 13 switch 14 Special transfer material 15 Normal transfer material
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H027 DC02 DC04 DE01 DE07 DE09 EA03 EA15 EA16 EC06 EC09 ED24 ZA01 2H200 FA18 GA09 GA23 GB46 HA12 HB03 HB26 JA02 JA12 JA28 JA29 JA30 JB06 JB12 JB17 LA15 MB01 MB02 MB03 NA02 PA05 PA10 PA18 PA22 PB08 PB12 PB38 ─────────────────────────────────────────────────── ─── Continued front page F term (reference) 2H027 DC02 DC04 DE01 DE07 DE09 EA03 EA15 EA16 EC06 EC09 ED24 ZA01 2H200 FA18 GA09 GA23 GB46 HA12 HB03 HB26 JA02 JA12 JA28 JA29 JA30 JB06 JB12 JB17 LA15 MB01 MB02 MB03 NA02 PA05 PA10 PA18 PA22 PB08 PB12 PB38
Claims (6)
し、前記転写材の背面からバイアスを印加する転写部を
備えた画像形成装置において、 前記転写部は、前記転写材の電気的性質に応じて切り替
え可能な２種類の転写手段を有することを特徴とする画
像形成装置。1. An image forming apparatus, comprising: a transfer unit that supplies a transfer material so as to contact an image carrier, and applies a bias from the back surface of the transfer material. An image forming apparatus having two types of transfer means that can be switched according to properties.
性及び絶縁性の２種類の転写材を使用可能とすることを
特徴とする画像形成装置。2. An image forming apparatus, wherein two kinds of conductive or semi-conductive and insulating transfer materials can be used as the transfer material.
一の転写手段と、前記転写材の搬送方向からみて前記第
一の転写手段の上流及び下流位置にそれぞれ設けられた
対の電極からなる第二の転写手段とを有することを特徴
とする請求項１または２いずれか記載の画像形成装置。3. The transfer unit comprises a first transfer unit facing the image carrier, and a pair of electrodes provided at upstream and downstream positions of the first transfer unit when viewed from the conveyance direction of the transfer material. 3. The image forming apparatus according to claim 1, further comprising a second transfer unit including the following.
手段に比べ低い転写バイアスが印加されていることを特
徴とする請求項１乃至３いずれか記載の画像形成装置。4. The image forming apparatus according to claim 1, wherein a transfer bias lower than that of the first transfer unit is applied to the second transfer unit.
るときに、第二の転写手段を付勢し、前記転写材が絶縁
性であるときに、前記第一の転写手段を付勢するように
作動する切り替え手段を有することを特徴とする請求項
１乃至４いずれか記載の画像形成装置。5. The second transfer means is energized when the transfer material is conductive or semi-conductive, and the first transfer means is energized when the transfer material is insulative. The image forming apparatus according to claim 1, further comprising a switching unit that operates so as to operate.
記像担持体及び前記２つの電極以外の部材とは電気的に
絶縁されていることを特徴とする請求項１乃至５いずれ
か記載の画像形成装置。6. The conductive or semi-conductive transfer material is electrically insulated from members other than the image carrier and the two electrodes. Image forming device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001316160A JP4091758B2 (en) | 2001-10-15 | 2001-10-15 | Image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001316160A JP4091758B2 (en) | 2001-10-15 | 2001-10-15 | Image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003122140A true JP2003122140A (en) | 2003-04-25 |
| JP4091758B2 JP4091758B2 (en) | 2008-05-28 |
Family
ID=19134214
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001316160A Expired - Fee Related JP4091758B2 (en) | 2001-10-15 | 2001-10-15 | Image forming apparatus |
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| Country | Link |
|---|---|
| JP (1) | JP4091758B2 (en) |
-
2001
- 2001-10-15 JP JP2001316160A patent/JP4091758B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
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