JPH1152645A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH1152645A JPH1152645A JP9213320A JP21332097A JPH1152645A JP H1152645 A JPH1152645 A JP H1152645A JP 9213320 A JP9213320 A JP 9213320A JP 21332097 A JP21332097 A JP 21332097A JP H1152645 A JPH1152645 A JP H1152645A
- Authority
- JP
- Japan
- Prior art keywords
- image
- toner image
- transfer material
- spur
- toner
- 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
- Delivering By Means Of Belts And Rollers (AREA)
- Discharge By Other Means (AREA)
- Counters In Electrophotography And Two-Sided Copying (AREA)
- Fixing For Electrophotography (AREA)
- Paper Feeding 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、像担持体の周辺に
帯電手段、画像書込手段と現像手段を配置して像担持体
に形成されたトナー像を転写材上に転写、定着する複写
機、プリンタ、FAX等の電子写真方式の画像形成装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to copying in which a charging means, an image writing means and a developing means are arranged around an image carrier to transfer and fix a toner image formed on the image carrier onto a transfer material. The present invention relates to an electrophotographic image forming apparatus such as a printer, a printer, and a facsimile.
【0002】[0002]
【従来の技術】従来、両面画像形成においては、像担持
体上に形成した一方の面の画像を転写材上に転写、定着
し、これを一旦両面反転給紙装置に収納し、再び像担持
体上に形成された画像とタイミングを合わせて両面反転
給紙装置より転写材を給送し、転写材上に他方の面の画
像を転写、定着する方法がとられている。2. Description of the Related Art Conventionally, in forming a double-sided image, an image on one side formed on an image carrier is transferred and fixed onto a transfer material, which is temporarily stored in a double-sided reversing sheet feeding device, and is again subjected to image bearing. A method has been adopted in which a transfer material is fed from a double-sided reversing sheet feeder in synchronization with an image formed on the body, and an image on the other surface is transferred and fixed onto the transfer material.
【0003】この両面画像形成装置では、上記の如く、
両面反転給紙装置への給送や定着装置を2度通す等の転
写材の搬送が行われるので、転写材搬送の信頼性が低
く、ジャムや転写材のしわ等を引き起こす原因となって
いた。In this double-sided image forming apparatus, as described above,
The transfer of the transfer material, such as feeding to the two-sided reversing paper feeder and passing through the fixing device twice, is performed, so that the reliability of transfer of the transfer material is low, causing jams and wrinkles of the transfer material. .
【0004】これに対し、特公昭49−37538号公
報、特公昭54−28740号公報、特開平1−444
57号公報や特開平4−214576号公報等により転
写材の両面にトナー像を形成後、1回で定着を行うもの
が提案され、特に特開平1−44457号公報や特開平
4−214576号公報等には、像担持体、帯電手段、
画像書込手段、現像手段等よりなる像形成手段を複数組
トナー像受像体上に並列に配置し、両面カラー画像を形
成する方法が提案されている。On the other hand, JP-B-49-37538, JP-B-54-28740, and JP-A-1-444.
Japanese Patent Application Laid-Open No. Hei 4-144576 and Japanese Patent Application Laid-Open No. Hei 4-214576 propose a method in which a toner image is formed on both surfaces of a transfer material and then fixed once after forming the toner image. Publications include an image carrier, charging means,
There has been proposed a method of forming a two-sided color image by arranging image forming means including image writing means, developing means and the like in parallel on a plurality of sets of toner image receivers.
【0005】また、本願発明者らは、第1の像担持手段
(感光体ドラム)の周りに帯電手段、画像書込手段、現
像手段等よりなるトナー像形成手段を複数組配置し、感
光体ドラム上に形成した重ね合わせカラートナー像を一
旦第1の転写手段により第2の像担持手段(トナー像受
像体)に一括して転写した後、再度感光体ドラム上に重
ね合わせカラートナー像を形成し、感光体ドラム上のト
ナー像及びトナー像受像体上のトナー像とタイミングを
合わせて供給される転写材を転写材帯電手段により帯電
してトナー像受像体に吸着させ、トナー像受像体上を搬
送される転写材の両面にそれぞれ、感光体ドラム上のト
ナー像を表面画像として第1の転写手段により転写し、
またトナー像受像体上のトナー像を裏面画像として第2
の転写手段により転写した後、定着手段側に設けられト
ナー像受像体を張架するローラ部材の曲率分離、或いは
必要に応じて設けられる転写材分離手段の除電によりト
ナー像受像体から転写材を分離し、転写材上のトナー像
を定着手段により定着して両面カラー画像を形成する画
像形成装置を作製し、該装置を用いて両面画像形成(転
写材の両面に画像形成を行う)や表面画像のみの片面画
像形成(転写材の表面のみに画像形成を行う)や裏面画
像のみの片面画像形成(転写材の裏面のみに画像形成を
行う)等を検討している。Further, the present inventors have arranged a plurality of sets of toner image forming means including a charging means, an image writing means, a developing means and the like around a first image bearing means (photosensitive drum), Once the superimposed color toner image formed on the drum is once transferred to the second image carrying means (toner image receiver) by the first transfer means, the superimposed color toner image is again transferred onto the photosensitive drum. The transfer material, which is formed and supplied in time with the toner image on the photosensitive drum and the toner image on the toner image receiver, is charged by the transfer material charging means and is attracted to the toner image receiver, so that the toner image receiver is The toner images on the photosensitive drums are respectively transferred as surface images by a first transfer unit to both surfaces of the transfer material conveyed above,
In addition, the toner image on the toner image receiver
After the transfer by the transfer means, the transfer material is separated from the toner image receiver by the curvature separation of the roller member provided on the fixing means side and stretching the toner image receiver, or by removing the charge of the transfer material separation means provided as necessary. An image forming apparatus for forming a two-sided color image by separating and fixing the toner image on the transfer material by a fixing unit is manufactured, and using this apparatus, a two-sided image formation (image formation on both sides of the transfer material) and a front surface A single-sided image formation of only an image (image formation only on the front surface of the transfer material), a single-sided image formation of only back surface image (image formation on only the back surface of the transfer material), and the like are being studied.
【0006】[0006]
【発明が解決しようとする課題】上記の検討において、
転写材に両面画像を転写した後、トナー像受像体から分
離した転写材を直接定着手段に搬送するような構造をと
ると、定着手段の熱によるトナー像受像体の変形及び劣
化等の問題が起こる。そこで、トナー像受像体と定着手
段との間に拍車を有する搬送部を設け、トナー像受像体
より分離された転写材を搬送部の拍車を介して定着手段
へと搬送するようにしているが、拍車がトナー像受像体
から遠いか、トナー像受像体の転写材搬送面に対して高
すぎると、転写材が自重により拍車手前で落ちてしま
い、逆にトナー像受像体に近すぎるか、トナー像受像体
の転写材搬送面に対して低すぎると、転写材が拍車に接
触せずトナー像受像体より分離される両面に未定着のト
ナー像を有する転写材が安定して定着手段へ搬送され
ず、トナー像が乱されるという問題が生じる。In the above study,
If the transfer material separated from the toner image receiver is directly conveyed to the fixing unit after transferring the double-sided image to the transfer material, problems such as deformation and deterioration of the toner image receiver due to the heat of the fixing unit may occur. Occur. Therefore, a transport unit having a spur is provided between the toner image receiver and the fixing unit, and the transfer material separated from the toner image receiver is transported to the fixing unit via the spur of the transport unit. If the spur is far from the toner image receiver or too high with respect to the transfer material transport surface of the toner image receiver, the transfer material will fall before the spur due to its own weight, and conversely, will be too close to the toner image receiver, If the transfer material is too low with respect to the transfer material conveying surface of the toner image receiver, the transfer material having an unfixed toner image on both surfaces separated from the toner image receiver without contacting the spur is stably transferred to the fixing unit. There is a problem that the toner image is not conveyed and the toner image is disturbed.
【0007】本発明は上記の問題点を解決し、トナー像
受像体より分離される転写材が安定して定着手段へ搬送
される画像形成装置を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an image forming apparatus in which a transfer material separated from a toner image receiving body is stably conveyed to a fixing unit.
【0008】[0008]
【課題を解決するための手段】上記目的は、トナー像形
成手段により形成されたトナー像を担持する第1の像担
持手段と、前記第1の像担持手段に担持されたトナー像
が転写され、転写された該トナー像を担持する第2の像
担持手段と、前記第1の像担持手段に担持されたトナー
像を前記第2の像担持手段および転写材の表面に転写す
る第1の転写手段と、前記第2の像担持手段に担持され
たトナー像を前記転写材の裏面に転写する第2の転写手
段と、前記転写材の両面に転写されたトナー像を定着す
る定着手段とを有し、前記転写材を前記第2の像担持手
段により搬送し、前記第2の像担持手段より転写材を分
離した後、前記定着手段により定着する画像形成装置に
おいて、前記第2の像担持手段と前記定着手段との間
に、前記第2の像担持手段より分離した前記転写材を前
記定着手段へと搬送する拍車を有する搬送部を設け、前
記搬送部を前記第2の像担持手段の転写材搬送面の延長
面の前記転写材の裏面側に配置し、前記第2の像担持手
段を張架する前記定着手段側のローラ部材の半径R1
(mm)を5〜20mmとするとともに、前記ローラ部
材に最も近い拍車の中心位置と前記ローラ部材の中心位
置との距離を10〜40mmとすることを特徴とする画
像形成装置によって達成される。An object of the present invention is to provide a first image carrying means for carrying a toner image formed by a toner image forming means, and a transfer of the toner image carried by the first image carrying means. A second image carrying means for carrying the transferred toner image, and a first image carrying means for transferring the toner image carried on the first image carrying means to the surface of the second image carrying means and the transfer material. Transfer means, second transfer means for transferring the toner image carried by the second image carrying means to the back surface of the transfer material, and fixing means for fixing the toner images transferred to both surfaces of the transfer material. An image forming apparatus which transports the transfer material by the second image bearing means, separates the transfer material from the second image bearing means, and fixes the transfer material by the fixing means. The second image bearing member is provided between the carrying unit and the fixing unit. A transfer unit having a spur for transferring the transfer material separated from the unit to the fixing unit; and providing the transfer unit on a back surface side of the transfer material of an extension surface of a transfer material transfer surface of the second image bearing unit. The radius R1 of the roller member on the fixing unit side that is disposed and stretches the second image bearing unit
(Mm) is set to 5 to 20 mm, and the distance between the center position of the spur closest to the roller member and the center position of the roller member is set to 10 to 40 mm.
【0009】[0009]
【発明の実施の形態】以下本発明の実施の形態を説明す
る。本欄の記載は請求項の技術的範囲や用語の意義を限
定するものではなく、以下における断定的な説明はベス
トモードを示すものであって、本発明の用語の意義や技
術的範囲を限定するものではない。なお以下の実施形態
の説明において、転写域において第1の像担持手段に対
向する側の転写材の面を表面、転写材の他方の側の面す
なわち第2の像担持手段に対向する側の転写材の面を裏
面といい、転写材の表面に転写される画像を表面画像、
転写材の裏面に転写される画像を裏面画像という。Embodiments of the present invention will be described below. The description in this section does not limit the technical scope of the claims and the meaning of the terms. The assertive description below shows the best mode, and limits the meaning of the terms and the technical scope of the present invention. It does not do. In the following description of the embodiment, in the transfer area, the surface of the transfer material on the side facing the first image bearing means is the front surface, and the surface on the other side of the transfer material, that is, the side on the side facing the second image bearing means. The surface of the transfer material is called the back surface, and the image transferred to the front surface of the transfer material is the front image,
The image transferred to the back side of the transfer material is called a back side image.
【0010】本発明にかかわる画像形成装置の一実施形
態の画像形成プロセス、各機構について、図1ないし図
3を用いて説明する。図1は、本発明にかかわる画像形
成装置の一実施形態を示すカラー画像形成装置の断面構
成図であり、図2は、図1の第1の像担持手段の側断面
図であり、図3は、本発明にかかわる画像形成装置の両
面のトナー像形成状態を示す図であり、図3(A)は、
第1の像担持手段に形成したトナー像を第2の像担持手
段上に転写し裏面画像を形成する図であり、図3(B)
は、第2の像担持手段上の裏面画像と同期して第1の像
担持手段に表面画像を形成する図であり、図3(C)
は、転写材上への両面画像形成を示す図である。An image forming process and each mechanism of an embodiment of the image forming apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a color image forming apparatus showing an embodiment of the image forming apparatus according to the present invention. FIG. 2 is a side sectional view of the first image bearing means of FIG. FIG. 3A is a diagram illustrating a state where toner images are formed on both surfaces of the image forming apparatus according to the present invention, and FIG.
FIG. 3B is a diagram in which the toner image formed on the first image bearing unit is transferred onto the second image bearing unit to form a back image, and FIG.
FIG. 3C is a diagram in which a front image is formed on the first image carrier in synchronization with a back image on the second image carrier, and FIG.
FIG. 4 is a diagram showing double-sided image formation on a transfer material.
【0011】図1において、10は第1の像担持手段で
ある感光体ドラム、11は各色毎の帯電手段であるスコ
ロトロン帯電器、12は各色毎の画像書込手段である露
光光学系、13は各色毎の現像手段である現像器、14
aは第2の像担持手段であるトナー像受像体、14cは
第1の転写手段である転写器、14gは第2の転写手段
である裏面転写器、150は転写材帯電手段である紙帯
電器、14hは転写材分離手段である紙分離AC除電
器、160は拍車162を有する搬送部、17は定着手
段である定着装置である。In FIG. 1, reference numeral 10 denotes a photosensitive drum as first image bearing means, 11 a scorotron charger as charging means for each color, 12 an exposure optical system as image writing means for each color, 13 Denotes a developing device which is a developing means for each color;
a is a toner image receiving body as a second image carrying means, 14c is a transfer unit as a first transfer unit, 14g is a back side transfer unit as a second transfer unit, and 150 is a paper charging unit as a transfer material charging unit. Reference numeral 14h denotes a paper separation AC static eliminator serving as a transfer material separating unit; 160, a conveying unit having a spur 162; and 17, a fixing device as a fixing unit.
【0012】第1の像担持手段である感光体ドラム10
は、例えば、光学ガラスや透明アクリル樹脂等の透明部
材によって形成される円筒状の基体の外周に、透明の導
電層、a−Si層あるいは有機感光層(OPC)等の感
光層を形成したものであり、導電層を接地した状態で図
1の矢印で示す時計方向に回転される。Photosensitive drum 10 as first image bearing means
Is formed by forming a photosensitive layer such as a transparent conductive layer, an a-Si layer, or an organic photosensitive layer (OPC) on the outer periphery of a cylindrical substrate formed of a transparent member such as optical glass or transparent acrylic resin. And rotated clockwise as indicated by the arrow in FIG. 1 with the conductive layer grounded.
【0013】感光体ドラム10は、図2に示すように、
それを係合固定する両端部のフランジ部材10a及び1
0bに嵌込まれたベアリングB1,B2により装置本体
に架設固定されるドラム軸30に対し軸受けされて回転
自在に支持され、フランジ部材10bの一体とする歯車
Gが装置本体側の不図示の駆動歯車と噛合して駆動され
ることにより所定の方向に定速で回転される。The photosensitive drum 10, as shown in FIG.
Flange members 10a and 1 at both ends for engaging and fixing it
A gear G integrated with the flange member 10b is rotatably supported by bearings B1 and B2 fitted into the drum body 30 and supported by a drum shaft 30 erected and fixed to the apparatus main body. The gear is driven in mesh with the gear to rotate at a constant speed in a predetermined direction.
【0014】各色毎の帯電手段であるスコロトロン帯電
器11、各色毎の画像書込手段である露光光学系12及
び各色毎の現像手段である現像器13は、これらを1組
として、イエロー(Y),マゼンタ(M),シアン
(C)および黒色(K)の各色の画像形成プロセス用と
して4組設けられ、図1の矢印にて示す感光体ドラム1
0の回転方向に対して、Y、M、C、Kの順に配置され
る。A scorotron charger 11, which is a charging unit for each color, an exposure optical system 12, which is an image writing unit for each color, and a developing unit 13, which is a developing unit for each color, form a set of yellow (Y) ), Magenta (M), cyan (C), and black (K) are provided for image forming processes, and four sets are provided.
With respect to the 0 rotation direction, Y, M, C, and K are arranged in this order.
【0015】各色毎の帯電手段であるスコロトロン帯電
器11は、それぞれ所定の電位に保持された制御グリッ
ドと例えば鋸歯状電極からなる放電電極11aとを有
し、感光体ドラム10の感光層と対峙して取付けられ、
トナーと同極性のコロナ放電によって帯電作用(本実施
形態においてはマイナス帯電)を行い、感光体ドラム1
0に対し一様な電位を与える。放電電極11aとして
は、その他ワイヤ電極や針状電極を用いることも可能で
ある。The scorotron charger 11, which is a charging means for each color, has a control grid maintained at a predetermined potential and a discharge electrode 11a composed of, for example, a sawtooth electrode, and faces the photosensitive layer of the photosensitive drum 10. And installed
The charging operation (in the present embodiment, negative charging) is performed by corona discharge having the same polarity as that of the toner.
A uniform potential is given to 0. As the discharge electrode 11a, a wire electrode or a needle electrode may be used.
【0016】各色毎の画像書込手段である露光光学系1
2は、感光体ドラム10上での露光位置が、前述した各
色毎のスコロトロン帯電器11に対して感光体ドラム1
0の回転方向下流側に位置するようにして感光体ドラム
10の内部に配置される。図2に示すように、それぞれ
の露光光学系12は、ドラム軸30と平行に主走査方向
に配列された像露光光の発光素子としてのLED(発光
ダイオード)を複数個アレイ状に並べた線状の露光素子
12aと、結像素子としての光集束性光伝送体(商品
名:セルフォックレンズアレイ)12bと、レンズホル
ダ12cとで構成される露光用ユニットであり、保持部
材20に取付けられる。保持部材20には各色毎の露光
光学系12の他に転写同時露光器12d及び一様露光器
12eが取付けられ、一体となって感光体ドラム10の
透光性の基体内部に収容される。各色毎の露光光学系1
2は、別体の画像読み取り装置によって読み取られメモ
リに記憶された各色の画像データに従って感光体ドラム
10の感光層を裏面から像露光し、感光体ドラム10上
に静電潜像を形成する。露光素子12aとしては、その
他FL(蛍光体発光),EL(エレクトロルミネッセン
ス),PL(プラズマ放電)等の複数の発光素子をアレ
イ状に並べたものを用いることも可能である。像露光光
発光素子の発光波長は、通常Y,M,Cのトナーに対し
て透過性の高い780〜900nmの範囲のものが用い
られるが、本実施形態においては裏面から像露光を行う
方式であるためカラートナーに対して透過性を十分に有
しないこれより短い400〜780nmの波長でもよ
い。なお図2において、WAは像露光手段の発光素子
(LED)よりのリード線である。Exposure optical system 1 as image writing means for each color
2 indicates that the exposure position on the photosensitive drum 10 is the photosensitive drum 1 with respect to the scorotron charger 11 for each color described above.
It is arranged inside the photoconductor drum 10 so as to be located on the downstream side in the rotation direction of 0. As shown in FIG. 2, each exposure optical system 12 has a line in which a plurality of LEDs (light emitting diodes) as light emitting elements of image exposure light arranged in the main scanning direction in parallel with the drum shaft 30 are arranged. An exposure unit composed of an exposure element 12a in the shape of a circle, a light-converging light transmitter (trade name: Selfoc lens array) 12b as an imaging element, and a lens holder 12c, which is attached to the holding member 20. . In addition to the exposure optical system 12 for each color, a transfer simultaneous exposure unit 12d and a uniform exposure unit 12e are attached to the holding member 20, and are housed integrally within the light-transmitting substrate of the photosensitive drum 10. Exposure optical system 1 for each color
2 exposes the photosensitive layer of the photosensitive drum 10 from the rear surface in accordance with image data of each color read by a separate image reading device and stored in a memory to form an electrostatic latent image on the photosensitive drum 10. As the exposure element 12a, an element in which a plurality of light-emitting elements such as FL (phosphor light emission), EL (electroluminescence), and PL (plasma discharge) are arranged in an array can be used. The emission wavelength of the image exposure light emitting element is usually in the range of 780 to 900 nm, which is highly transparent to Y, M, and C toners. For this reason, a shorter wavelength of 400 to 780 nm which does not have sufficient transparency to the color toner may be used. In FIG. 2, WA is a lead wire from a light emitting element (LED) of the image exposure means.
【0017】各色毎の現像手段である現像器13は、感
光体ドラム10の周面に対し所定の間隙を保ち、感光体
ドラム10の回転方向と順方向に回転する例えば厚み
0.5〜1mm、外径15〜25mmの円筒状の非磁性
のステンレスあるいはアルミ材で形成された現像スリー
ブ131と、現像ケーシング138を有し、内部にイエ
ロー(Y),マゼンタ(M),シアン(C)および黒色
(K)の一成分或いは二成分現像剤を収容している。そ
れぞれの現像器13は不図示の突き当てコロにより感光
体ドラム10と所定の間隙、例えば100〜500μm
をあけて非接触に保たれており、現像スリーブ131に
対して直流電圧と交流電圧を重畳した現像バイアスを印
加することにより、非接触の反転現像を行い、感光体ド
ラム10上にトナー像を形成する。A developing device 13 as a developing means for each color keeps a predetermined gap with respect to the peripheral surface of the photosensitive drum 10 and rotates in the forward direction with respect to the rotating direction of the photosensitive drum 10, for example, 0.5 to 1 mm in thickness. A cylindrical developing sleeve 131 made of non-magnetic stainless steel or aluminum having an outer diameter of 15 to 25 mm, and a developing casing 138. Yellow (Y), magenta (M), cyan (C), It contains a black (K) one-component or two-component developer. Each of the developing devices 13 is provided with a predetermined gap, for example, 100 to 500 μm, from the photosensitive drum 10 by an abutting roller (not shown).
Is applied, and a non-contact reversal development is performed by applying a developing bias in which a DC voltage and an AC voltage are superimposed on the developing sleeve 131, and a toner image is formed on the photosensitive drum 10. Form.
【0018】第2の像担持手段であるトナー像受像体1
4aは体積抵抗率1012〜1015Ω・cmの無端ベルト
であり、例えば変性ポリイミド、熱硬化ポリイミド、エ
チレンテトラフルオロエチレン共重合体、ポリフッ化ビ
ニリデン、ナイロンアロイ等のエンジニアリングプラス
チックに導電材料を分散した、厚さ0.1〜1.0mm
の半導電性フィルム基体の外側に、好ましくはトナーフ
ィルミング防止層として厚さ5〜50μmのフッ素コー
ティングを行った、2層構成のシームレスベルトであ
る。ベルトの基体としては、この他に、シリコンゴム或
いはウレタンゴム等に導電材料を分散した厚さ0.1〜
2.0mmの半導電性ゴムベルトを使用することもでき
る。トナー像受像体14aは、ローラ部材である駆動ロ
ーラ14dと従動ローラ14eとガイドローラ14fと
テンションローラ14iとに内接して張架され、図1の
矢印で示す反時計方向に回転される。トナー像受像体1
4aの回転方向に従い従動ローラ14e、駆動ローラ1
4d、テンションローラ14i、ガイドローラ14fの
順に設けられ、従動ローラ14e、駆動ローラ14d及
びガイドローラ14fは固定して回転され、テンション
ローラ14iはトナー像受像体14aの不図示のバネ等
の弾力によりトナー像受像体14aを張架して回転され
る。駆動モータM1(図4参照)よりの駆動をうけて駆
動ローラ14dが回転され、トナー像受像体14aが駆
動回転される。トナー像受像体14aの回転により従動
ローラ14e、ガイドローラ14f及びテンションロー
ラ14iが従動回転される。回転中のトナー像受像体1
4aのベルト弛みがテンションローラ14iにより緊張
される。Toner image receiver 1 as second image bearing means
Reference numeral 4a denotes an endless belt having a volume resistivity of 10 12 to 10 15 Ω · cm. For example, a conductive material is dispersed in engineering plastics such as modified polyimide, thermosetting polyimide, ethylene tetrafluoroethylene copolymer, polyvinylidene fluoride, and nylon alloy. 0.1-1.0mm thick
Is a seamless belt having a two-layer structure in which a fluorine coating having a thickness of 5 to 50 μm is preferably formed on the outside of the semiconductive film substrate as a toner filming preventing layer. In addition to the above, as a base of the belt, a conductive material dispersed in silicon rubber or urethane rubber or the like is used in a thickness of 0.1 to 0.1.
A 2.0 mm semiconductive rubber belt can also be used. The toner image receiver 14a is stretched in contact with a driving roller 14d, a driven roller 14e, a guide roller 14f, and a tension roller 14i, which are roller members, and is rotated in a counterclockwise direction indicated by an arrow in FIG. Toner image receiver 1
Driven roller 14e, driving roller 1
4d, a tension roller 14i, and a guide roller 14f are provided in this order. The driven roller 14e, the drive roller 14d, and the guide roller 14f are fixedly rotated, and the tension roller 14i is resilient by a spring or the like (not shown) of the toner image receiver 14a. The toner image receiver 14a is rotated while being stretched. The drive roller 14d is rotated by the drive from the drive motor M1 (see FIG. 4), and the toner image receiver 14a is driven and rotated. The driven roller 14e, the guide roller 14f, and the tension roller 14i are driven to rotate by the rotation of the toner image receiver 14a. Rotating toner image receiver 1
The slack of the belt 4a is tensioned by the tension roller 14i.
【0019】好ましくはコロナ放電器により構成される
第1の転写手段である転写器14cは、トナー像受像体
14aを挟んで感光体ドラム10に対向して設けられ、
トナー像受像体14aと感光体ドラム10との間に転写
域14bを形成する。転写器14cにはトナーと反対極
性(本実施形態においてはプラス極性)の直流電圧を印
加し、転写域14bに転写電界を形成することにより、
感光体ドラム10上のトナー像をトナー像受像体14a
上または転写材である記録紙Pの表面に転写する。A transfer unit 14c, which is preferably a first transfer unit constituted by a corona discharger, is provided opposite to the photosensitive drum 10 with the toner image receiver 14a interposed therebetween.
A transfer area 14b is formed between the toner image receiver 14a and the photosensitive drum 10. By applying a DC voltage of the opposite polarity (positive polarity in the present embodiment) to the transfer device 14c and forming a transfer electric field in the transfer area 14b,
The toner image on the photosensitive drum 10 is transferred to the toner image receiving member 14a.
The image is transferred onto the upper surface or the surface of the recording paper P as a transfer material.
【0020】好ましくはコロナ放電器により構成される
第2の転写手段である裏面転写器14gは、トナー像受
像体14aを挟んで接地された導電性の駆動ローラ14
dに対向して設けられ、トナーと反対極性(本実施形態
においてはプラス極性)の直流電圧が印加され、トナー
像受像体14a上のトナー像を記録紙Pの裏面に転写す
る。A back transfer unit 14g, which is preferably a second transfer unit constituted by a corona discharger, includes a conductive drive roller 14 grounded with a toner image receiver 14a interposed therebetween.
d, a DC voltage having a polarity opposite to that of the toner (positive polarity in this embodiment) is applied to transfer the toner image on the toner image receiver 14 a to the back surface of the recording paper P.
【0021】好ましくはコロナ放電器により構成される
転写材帯電手段である紙帯電器150は、トナー像受像
体14aを挟んで接地された従動ローラ14eと対向し
て設けられ、記録紙Pを帯電してトナー像受像体14a
に吸着させる。A paper charger 150, which is preferably a transfer material charging means constituted by a corona discharger, is provided to face the driven roller 14e, which is grounded across the toner image receiver 14a, and charges the recording paper P. And the toner image receiver 14a
To be absorbed.
【0022】好ましくはコロナ放電器により構成される
転写材分離手段である紙分離AC除電器14hは、必要
に応じてトナー像受像体14aの定着装置17側端部に
トナー像受像体14aを挟んで接地された導電性の駆動
ローラ14dに対向して設けられ、必要に応じてトナー
と同極性または逆極性の直流電圧を重畳した交流電圧が
印加され、トナー像受像体14aにより搬送される記録
紙Pを除電してトナー像受像体14aから記録紙Pを分
離する。A paper separating AC neutralizer 14h, which is preferably a transfer material separating means constituted by a corona discharger, interposes the toner image receiver 14a at the end of the toner image receiver 14a on the fixing device 17 side as required. A recording is carried by the toner image receiving body 14a, which is provided opposite to the conductive driving roller 14d which is grounded at the above, and is applied with an AC voltage on which a DC voltage having the same polarity or opposite polarity to the toner is superimposed if necessary. The paper P is neutralized to separate the recording paper P from the toner image receiver 14a.
【0023】搬送部160はトナー像受像体14aと定
着装置17との間に設けられ、搬送部160の上面には
拍車162が設けられる。拍車162は、記録紙Pがト
ナー像受像体14aより分離される際にトナー像受像体
14a方向へ曲がって搬送されようとする記録紙Pをす
くい上げるとともに、裏面にトナー像を有する記録紙P
を裏面トナー像の乱れを防止しながら定着装置17へと
搬送する。The transport section 160 is provided between the toner image receiver 14a and the fixing device 17, and a spur 162 is provided on the upper surface of the transport section 160. The spur 162 scoops up the recording paper P that is to be bent and conveyed in the direction of the toner image receiving body 14a when the recording paper P is separated from the toner image receiving body 14a, and the recording paper P having the toner image on the back surface.
Is transported to the fixing device 17 while preventing the rear toner image from being disturbed.
【0024】定着手段である定着装置17は、内部にヒ
ータを有する定着ローラ17aと圧着ローラ17bとの
2本のローラ状の定着部材で構成され、定着ローラ17
aと圧着ローラ17bとの間のニップ部Tで熱と圧力と
を加えることにより記録紙P上のトナー像を定着する。The fixing device 17 as a fixing means is composed of two roller-shaped fixing members, a fixing roller 17a having a heater inside and a pressure roller 17b.
The toner image on the recording paper P is fixed by applying heat and pressure at a nip T between the a and the pressure roller 17b.
【0025】次に画像形成プロセスを説明する。Next, the image forming process will be described.
【0026】画像記録のスタートにより不図示の感光体
駆動モータの始動により感光体ドラム10が図1の矢印
で示す時計方向へ回転され、同時にイエロー(Y)のス
コロトロン帯電器11の帯電作用により感光体ドラム1
0に電位の付与が開始される。The start of image recording causes the photosensitive drum drive motor (not shown) to start, thereby rotating the photosensitive drum 10 in the clockwise direction indicated by the arrow in FIG. 1 and simultaneously exposing the photosensitive drum 10 by the charging action of the yellow (Y) scorotron charger 11. Body drum 1
Application of a potential to 0 starts.
【0027】感光体ドラム10は電位を付与されたあ
と、Yの露光光学系12によって第1の色信号すなわち
Yの画像データに対応する電気信号による画像書込が開
始され、感光体ドラム10の表面に原稿画像のYの画像
に対応する静電潜像を形成される。After the photosensitive drum 10 is applied with a potential, the Y exposure optical system 12 starts image writing with a first color signal, that is, an electric signal corresponding to the Y image data. An electrostatic latent image corresponding to the Y image of the original image is formed on the front surface.
【0028】前記の潜像はYの現像器13により非接触
の状態で反転現像され、感光体ドラム10上にイエロー
(Y)のトナー像が形成される。The latent image is reversal-developed in a non-contact state by the Y developing unit 13, and a yellow (Y) toner image is formed on the photosensitive drum 10.
【0029】次いで感光体ドラム10は、Yのトナー像
の上からマゼンタ(M)のスコロトロン帯電器11の帯
電作用により電位が付与され、Mの露光光学系12によ
って第2の色信号すなわちMの画像データに対応する電
気信号による画像書込が行われ、Mの現像器13による
非接触の反転現像によって前記のイエロー(Y)のトナ
ー像の上にマゼンタ(M)のトナー像が重ね合わせて形
成される。Next, a potential is applied to the photosensitive drum 10 from the Y toner image by a charging action of a magenta (M) scorotron charger 11, and a second color signal, that is, an M color signal is applied by an M exposure optical system 12. Image writing is performed by an electric signal corresponding to the image data, and the magenta (M) toner image is superimposed on the yellow (Y) toner image by non-contact reversal development by the M developing unit 13. It is formed.
【0030】同様のプロセスにより、シアン(C)のス
コロトロン帯電器11、Cの露光光学系12およびCの
現像器13によってさらに第3の色信号に対応するシア
ン(C)のトナー像が重ね合わせて形成され、更にその
上に黒色(K)のスコロトロン帯電器11、Kの露光光
学系12およびKの現像器13によって第4の色信号に
対応する黒色(K)のトナー像が順次重ね合わせて形成
され、感光体ドラム10の一回転以内にその周面上にイ
エロー(Y),マゼンタ(M),シアン(C)および黒
色(K)の4色の重ね合わせカラートナー像が形成され
る(トナー像形成手段)。By the same process, the cyan (C) toner image corresponding to the third color signal is further superimposed by the cyan (C) scorotron charger 11, the exposure optical system 12 of C and the developing device 13 of C. The black (K) toner image corresponding to the fourth color signal is sequentially superimposed thereon by a black (K) scorotron charger 11, a K exposure optical system 12, and a K developing device 13. A superposed color toner image of four colors of yellow (Y), magenta (M), cyan (C), and black (K) is formed on the peripheral surface within one rotation of the photosensitive drum 10. (Toner image forming means).
【0031】これらY,M,C及びKの露光光学系12
による感光体ドラム10の感光層に対する画像書込はド
ラムの内部より前述した透光性の基体を通して行われ
る。従って第2,第3および第4の色信号に対応する画
像の書込は何れも先に形成されたトナー像の影響を全く
受けることなく行われ、第1の色信号に対応する画像と
同等の静電潜像を形成することが可能となる。These Y, M, C and K exposure optical systems 12
Image writing on the photosensitive layer of the photosensitive drum 10 is performed from the inside of the drum through the above-described translucent substrate. Therefore, the writing of the images corresponding to the second, third and fourth color signals is performed without any influence from the previously formed toner image, and is equivalent to the image corresponding to the first color signal. Can be formed.
【0032】上記の画像形成プロセスによって第1の像
担持手段である感光体ドラム10上に形成された裏面画
像となる重ね合わせカラートナー像は、転写域14bに
おいて、第1の転写手段である転写器14cによって、
第2の像担持手段であるトナー像受像体14a上に一括
して転写される(図3(A))。この際、良好な転写が
なされるように、感光体ドラム10の内部に設けた転写
同時露光器12dによる一様露光が行われるようにして
もよい。The superimposed color toner image, which is the back side image formed on the photosensitive drum 10 as the first image carrying means by the above image forming process, is transferred in the transfer area 14b as the first transferring means. By the vessel 14c
The toner image is transferred onto the toner image receiving member 14a, which is a second image bearing member, at a time (FIG. 3A). At this time, uniform exposure may be performed by the simultaneous transfer exposure device 12d provided inside the photoconductor drum 10 so that good transfer is performed.
【0033】転写後の感光体ドラム10の周面上に残っ
たトナーは感光体ドラムAC除電器16により除電を受
けた後、第1の像担持手段クリーニング手段であるクリ
ーニング装置19にいたり、感光体ドラム10に当接し
たゴム材から成るクリーニングブレード19aによって
クリーニングされ、スクリュウ19bによって図示せぬ
排トナー容器に回収される。また、感光体ドラム10の
周面は、例えば発光ダイオードを用いた帯電前の一様露
光器12eによる露光によって先の画像形成における感
光体ドラム10の履歴が解消される。After the toner remaining on the peripheral surface of the photosensitive drum 10 after the transfer is subjected to static elimination by the photosensitive drum AC static eliminator 16, the toner is transferred to a cleaning device 19, which is a first image carrier cleaning means, or is exposed to light. The toner is cleaned by a cleaning blade 19a made of a rubber material in contact with the body drum 10, and is collected by a screw 19b in a toner discharge container (not shown). The history of the photosensitive drum 10 in the previous image formation on the peripheral surface of the photosensitive drum 10 is eliminated by, for example, exposure by the uniform exposure device 12e before charging using a light emitting diode.
【0034】以上のようにしてトナー像受像体14a上
に裏面画像となる重ね合わせカラートナー像が形成され
た後、引続き表面画像となる重ね合わせカラートナー像
が上記のカラー画像形成プロセスと同様にして感光体ド
ラム10上に形成される(図3(B))。この際、感光
体ドラム10上に形成される表面画像は、前記感光体ド
ラム10上に形成した裏面画像に対して鏡像となるよう
に画像データが変更される。After the superimposed color toner image as the back surface image is formed on the toner image receiving member 14a as described above, the superimposed color toner image as the front surface image is continuously formed in the same manner as in the above color image forming process. To form on the photosensitive drum 10 (FIG. 3B). At this time, the image data is changed so that the front surface image formed on the photosensitive drum 10 is a mirror image of the rear surface image formed on the photosensitive drum 10.
【0035】感光体ドラム10上への表面画像形成にと
もなって転写材である記録紙Pが転写材収納手段である
給紙カセット15より、送り出しローラ15aにより送
り出され、転写材給送手段としてのタイミングローラ1
5bへ搬送され、タイミングローラ15bの駆動によっ
て、感光体ドラム10上に担持された表面画像のカラー
トナー像と、トナー像受像体14aに担持されている裏
面画像のカラートナー像との同期がとられて転写域14
bへ給送される。この際、給送される記録紙Pの表面側
に設けられトナーと同極性(本実施形態においてはマイ
ナス極性)の直流電圧が印加される紙帯電器150によ
り、記録紙Pがトナーと同極性に紙帯電され、トナー像
受像体14aに吸着されて転写域14bへ給送される。
トナーと同極性に紙帯電を行うことにより、トナー像受
像体14a上のトナー像や感光体ドラム10上のトナー
像と引き合うことを防止して、トナー像の乱れを防止し
ている。なお、後述する紙帯電器150を第2の像担持
手段帯電手段として用いる場合を除き、転写材帯電手段
である紙帯電器150への電圧の印加は、通常記録紙P
の送られているときのみであり、記録紙Pの通過と同時
に紙帯電器150へ印加されている電圧が切断される。
紙帯電器150としてはコロナ放電器の他に、紙帯電ブ
ラシや紙帯電ローラ等を用いることも可能である。With the formation of a surface image on the photosensitive drum 10, recording paper P as a transfer material is sent out from a paper feed cassette 15 as a transfer material storage means by a feed roller 15a, and is used as a transfer material feeding means. Timing roller 1
5b and driven by the timing roller 15b to synchronize the color toner image of the front surface image carried on the photosensitive drum 10 with the color toner image of the rear surface image carried on the toner image receiver 14a. Transfer area 14
b. At this time, the recording paper P is provided with a DC voltage of the same polarity as the toner (in the present embodiment, a negative polarity) provided on the surface side of the fed recording paper P, and the recording paper P is made to have the same polarity as the toner. , And is adsorbed on the toner image receiving body 14a and fed to the transfer area 14b.
By charging the paper with the same polarity as the toner, the toner is prevented from being attracted to the toner image on the toner image receiving member 14a or the toner image on the photosensitive drum 10, thereby preventing the toner image from being disturbed. Unless the paper charger 150 described later is used as the second image carrier charging means, the voltage is normally applied to the paper charger 150 as the transfer material charging means.
The voltage applied to the paper charger 150 is cut off simultaneously with the passage of the recording paper P.
As the paper charger 150, a paper charging brush, a paper charging roller, or the like can be used in addition to the corona discharger.
【0036】転写域14bではトナーと反対極性(本実
施形態においてはプラス極性)の電圧が印加される第1
の転写手段としての転写器14cによって感光体ドラム
10上の表面画像が一括して記録紙Pの表面に転写され
る。このとき、トナー像受像体14a上の裏面画像は記
録紙Pに転写されないでトナー像受像体14a上に存在
する。転写器14cによる転写の際、良好な転写がなさ
れるように、転写域14bと対向して感光体ドラム10
の内部に設けられた、例えば発光ダイオードを用いた転
写同時露光器12dによる一様露光が行われるようにし
てもよい。In the transfer area 14b, a first voltage to which a voltage having a polarity opposite to that of the toner (positive polarity in the present embodiment) is applied.
The surface image on the photosensitive drum 10 is collectively transferred onto the surface of the recording paper P by the transfer device 14c as a transfer means. At this time, the back surface image on the toner image receiver 14a is not transferred to the recording paper P but exists on the toner image receiver 14a. At the time of transfer by the transfer device 14c, the photosensitive drum 10 is opposed to the transfer area 14b so that good transfer is performed.
A uniform exposure may be performed by a simultaneous transfer exposure device 12d using, for example, a light emitting diode provided inside the device.
【0037】表面にカラートナー像が転写された記録紙
Pは、トナーと反対極性(本実施形態においてはプラス
極性)の電圧が印加される第2の転写手段としての裏面
転写器14gへと搬送され、裏面転写器14gによりト
ナー像受像体14aの周面上の裏面画像が一括して記録
紙Pの裏面に転写される(図3(C))。The recording paper P on which the color toner image has been transferred to the front surface is conveyed to a back transfer device 14g as a second transfer means to which a voltage having a polarity opposite to that of the toner (positive polarity in this embodiment) is applied. Then, the back surface image on the peripheral surface of the toner image receiver 14a is collectively transferred to the back surface of the recording paper P by the back surface transfer device 14g (FIG. 3C).
【0038】両面にカラートナー像が形成された記録紙
Pは、トナー像受像体14aを駆動する駆動ローラ14
dの曲率と、トナー像受像体14aの端部に必要に応じ
て設けられる転写材分離手段としての紙分離AC除電器
14hの除電作用とにより、トナー像受像体14aから
分離され、拍車162が設けられた搬送部160を通し
て定着手段としての定着装置17へと搬送され、定着ロ
ーラ17aと圧着ローラ17bとの間のニップ部Tで熱
と圧力とを加えられることにより記録紙P上のトナー像
が定着される。両面画像記録がなされた記録紙Pは表裏
を反転されて送られ、排紙ローラ18により装置外部の
トレイへ排出される。また図1の一点鎖線で示すよう
に、定着装置17の出口に不図示の切替部材を設け装置
外部のトレイへ排出するようにしてもよい。The recording paper P on which the color toner images are formed on both sides is driven by a driving roller 14 for driving a toner image receiver 14a.
The spur 162 is separated from the toner image receiver 14a by the curvature of d and the static electricity removing action of the paper separating AC static electricity eliminator 14h as a transfer material separating means provided as needed at the end of the toner image receptor 14a. The toner image is conveyed to a fixing device 17 as a fixing unit through a conveying unit 160 provided, and is applied with heat and pressure at a nip portion T between the fixing roller 17a and the pressure roller 17b, so that the toner image on the recording paper P is formed. Is established. The recording paper P on which double-sided image recording has been performed is sent upside down, and is discharged by a discharge roller 18 to a tray outside the apparatus. Further, as shown by a dashed line in FIG. 1, a switching member (not shown) may be provided at an outlet of the fixing device 17 so as to be discharged to a tray outside the device.
【0039】転写後のトナー像受像体14aの周面上に
残ったトナーは、トナー像受像体14aを挟んでガイド
ローラ14fに対向して設けられ、支軸142を回転支
点としてトナー像受像体14aに当接及び当接解除可能
なトナー像受像体クリーニングブレード141を有する
第2の像担持手段クリーニング手段であるトナー像受像
体クリーニング装置140によりクリーニングされる。The toner remaining on the peripheral surface of the toner image receiving member 14a after the transfer is provided to face the guide roller 14f with the toner image receiving member 14a interposed therebetween, and the toner image receiving member 14 is rotated around the support shaft 142 as a fulcrum. The toner image receiving member is cleaned by a toner image receiving member cleaning device 140 which is a second image carrying means cleaning means having a toner image receiving member cleaning blade 141 capable of contacting and releasing contact with 14a.
【0040】また、転写後の感光体ドラム10の周面上
に残ったトナーは、感光体ドラムAC除電器16により
除電を受けた後、クリーニング装置19により残留トナ
ーを除去され、帯電前の一様露光器12eにより先の画
像形成における感光体ドラム10の履歴が解消されて、
次の画像形成サイクルにはいる。The toner remaining on the peripheral surface of the photoreceptor drum 10 after the transfer is subjected to static elimination by the photoreceptor drum AC static eliminator 16, and then the residual toner is removed by the cleaning device 19. The history of the photosensitive drum 10 in the previous image formation is eliminated by the exposure unit 12e,
The next image forming cycle is started.
【0041】上記の方法を用いることにより、重ね合わ
せカラートナー像を一括転写するので、トナー像受像体
14a上のカラー画像の色ズレやトナーの散りやこすれ
等が起こりにくく、画像劣化が少ない良好な両面カラー
画像形成がなされる。Since the superimposed color toner images are collectively transferred by using the above-described method, the color image on the toner image receiving member 14a hardly undergoes color misregistration, toner scattering or rubbing, and image deterioration is reduced. A double-sided color image is formed.
【0042】また、上記両面画像形成装置の実施形態と
してカラー画像形成装置にて説明したが、本発明は必ず
しもこれに限定されるものでなく、図1にて説明したと
同様のプロセスによるモノクロの両面画像形成装置にも
適用されるものである。Although the embodiment of the double-sided image forming apparatus has been described with reference to the color image forming apparatus, the present invention is not necessarily limited to this, and the present invention is not limited to this. The present invention is also applied to a double-sided image forming apparatus.
【0043】さらに、本発明の画像形成装置では、上述
の実施形態で説明したような転写材の両面に画像を形成
する両面画像形成の外に、転写材の表面または裏面のみ
の片側に画像を形成する片側画像形成もなされ得ること
は勿論である。Further, in the image forming apparatus of the present invention, in addition to the double-sided image formation for forming an image on both sides of the transfer material as described in the above embodiment, the image is formed on one side of only the front surface or the back surface of the transfer material. It goes without saying that one-sided image formation can also be performed.
【0044】本発明にかかわる拍車及び拍車を有する搬
送部について図4ないし図6、及び図1を用いて説明す
る。図4は、搬送部を示す図であり、図5は、搬送部に
設けられる拍車の斜視図であり、図6は、拍車の拡大図
である。The spur and the transporting unit having the spur according to the present invention will be described with reference to FIGS. 4 to 6 and FIG. FIG. 4 is a diagram showing a transport unit, FIG. 5 is a perspective view of a spur provided in the transport unit, and FIG. 6 is an enlarged view of the spur.
【0045】駆動モータM1により駆動回転されるロー
ラ部材である駆動ローラ14dにより移動されるトナー
像受像体14aにより表面画像のトナー像と裏面画像の
トナー像とが形成された記録紙Pが搬送されるが、トナ
ー像受像体14aの転写材搬送面或いはその延長面PL
1(以降転写材搬送面PL1という;図7参照)より記
録紙Pの裏面側に、拍車162が設けられた搬送部16
0がトナー像受像体14aと定着装置17との間に配設
され、トナー像受像体14aより分離された記録紙Pが
搬送部160を通して上下に定着ローラ17a、圧着ロ
ーラ17bが設けられた定着装置17に搬送される。The recording paper P on which the toner image of the front surface image and the toner image of the back surface image are formed by the toner image receiving member 14a moved by the driving roller 14d which is a roller member driven and rotated by the driving motor M1 is conveyed. However, the transfer material conveying surface of the toner image receiving body 14a or its extension surface PL
1 (hereinafter referred to as a transfer material transport surface PL1; see FIG. 7), a transport unit 16 provided with a spur 162 on the back side of the recording paper P.
0 is disposed between the toner image receiving member 14a and the fixing device 17, and the recording paper P separated from the toner image receiving member 14a passes through the transport unit 160 and has a fixing roller 17a and a pressure roller 17b provided vertically. It is transported to the device 17.
【0046】拍車162に一体的に設けられた中心軸1
62aが搬送ガイド部材163のガイド面163aと反
対側の半円状の止め部163bの孔に挿入され、中心軸
162aの先端部をEリングEで止められて、拍車16
2が回転可能に搬送ガイド部材163に取付けられる。
拍車162が取付けられた複数の搬送ガイド部材163
が搬送部筺体161に取付けられ搬送部160が構成さ
れる。Center shaft 1 provided integrally with spur 162
62a is inserted into the hole of the semicircular stop 163b on the opposite side of the guide surface 163a of the transport guide member 163, and the front end of the center shaft 162a is stopped by the E-ring E.
2 is rotatably attached to the transport guide member 163.
A plurality of conveyance guide members 163 to which spurs 162 are attached
Are attached to the transport section housing 161 to form the transport section 160.
【0047】記録紙Pの搬送方向と直交する方向に複数
個の拍車162が拍車の組H1,H2として設けられ
る。拍車の組は少なくとも1組以上設けられる。A plurality of spurs 162 are provided as a set of spurs H1, H2 in a direction orthogonal to the direction in which the recording paper P is conveyed. At least one set of spurs is provided.
【0048】搬送ガイド部材163のガイド面163a
は拍車162の回転中心よりも転写材搬送面側に設けら
れる。これによりトナー像受像体14aより分離された
記録紙Pの先端部がガイド面163aに接した場合にも
ガイド面163aによりすくい上げられ拍車162に送
られ、拍車162の突出部162bが記録紙Pに接触或
いは突刺さる状態で拍車162が従動回転され、トナー
像が擦られずに記録紙Pが定着装置17へと搬送され
る。Guide surface 163a of transport guide member 163
Is provided on the transfer material transport surface side of the rotation center of the spur 162. Accordingly, even when the leading end of the recording paper P separated from the toner image receiver 14a contacts the guide surface 163a, the recording paper P is scooped up by the guide surface 163a and sent to the spur 162, and the protrusion 162b of the spur 162 is attached to the recording paper P. The spur 162 is driven and rotated in a state of contact or piercing, and the recording paper P is conveyed to the fixing device 17 without rubbing the toner image.
【0049】拍車162は、ステンレス板や銅板等の金
属板をエッチング加工した厚さ0.05〜0.5mm、
外径5〜25mm(後述するように駆動ローラ14dの
半径をR1mmとするとき、好ましくは(0.2〜1.
0)×R1)のものや、厚さ0.5〜2.0mm、外径
5〜25mm(後述するように駆動ローラ14dの半径
をR1mmとするとき、好ましくは(0.2〜1.0)
×R1)の絶縁性樹脂部材によるものが用いられ、先端
に鋭利な突出部162bを設けた多角形、例えば六角形
状の板状の部材よりなる。拍車162が金属板の場合
は、108〜1014Ωの抵抗体を介して接地されること
が好ましい。拍車152が金属板を通し、高抵抗体を介
して或いは高抵抗部材を用いて接地されるのは、トナー
や転写材が荷電を有しており、拍車152の電荷蓄積や
鏡像力によるトナー付着を除電により防止し、トナー像
の乱れを防ぐためである。同様の状態を金属板をフロー
ティングして絶縁状態としてトナー付着を防止し、トナ
ー像の乱れを防ぐことも可能である。また、金属板にト
ナーと同極性(本実施形態においてはマイナス極性)の
電圧を印加しトナー付着を防止し、トナー像の乱れを防
ぐことも可能である。拍車162に絶縁性樹脂部材等の
絶縁性部材を用いることにより、上記のフローティング
と同様に拍車152の電荷蓄積や鏡像力によるトナー付
着を除電により防止し、トナー像の乱れを防ぐことが可
能となる。The spur 162 has a thickness of 0.05 to 0.5 mm obtained by etching a metal plate such as a stainless steel plate or a copper plate.
Outer diameter 5 to 25 mm (when the radius of the drive roller 14 d is R1 mm as described later, preferably (0.2 to 1.
0) × R1), a thickness of 0.5 to 2.0 mm, and an outer diameter of 5 to 25 mm (when the radius of the driving roller 14d is R1 mm as described later, it is preferably (0.2 to 1.0) )
× R1) made of an insulating resin member, and is made of a polygonal, for example, hexagonal, plate-shaped member having a sharp projection 162b at the tip. When the spur 162 is a metal plate, it is preferable that the spur 162 be grounded via a resistor of 10 8 to 10 14 Ω. The spur 152 passes through a metal plate and is grounded via a high-resistance body or using a high-resistance member because the toner and the transfer material have a charge, and the spur 152 accumulates electric charge and adheres to the toner due to a mirror image force. Is prevented by static elimination to prevent the toner image from being disturbed. It is also possible to prevent the toner from adhering and prevent the toner image from being disturbed by floating the metal plate in an insulating state. It is also possible to apply a voltage of the same polarity as the toner (minus polarity in the present embodiment) to the metal plate to prevent the toner from adhering and prevent the toner image from being disturbed. By using an insulating member such as an insulating resin member for the spur 162, it is possible to prevent charge accumulation of the spur 152 and toner adhesion due to mirror image force by static elimination and to prevent the toner image from being disturbed in the same manner as the above-mentioned floating. Become.
【0050】拍車の位置関係について図7及び図6を用
いて説明する。図7は、拍車と駆動ローラとの位置関係
を示す図である。The positional relationship between the spurs will be described with reference to FIGS. FIG. 7 is a diagram illustrating a positional relationship between the spur and the drive roller.
【0051】第2の像担持手段であるトナー像受像体1
4aを張架、駆動するローラ部材である駆動ローラ14
dとしては、一般的に駆動ローラ14dの半径をR1
(mm)とすると、半径5〜20mm(外径10〜40
mm)のものが用いられてトナー像受像体14aが搬送
されるが、駆動ローラ14dに最も近い組の拍車162
の中心位置と駆動ローラ14dの中心位置との距離L1
は10〜40mmとすることが好ましい。距離L1が4
0mmを越え、拍車14dがトナー像受像体14aから
遠いと、記録紙Pが自重により拍車手前で落ちてしま
い、逆に距離L1が10mm未満でトナー像受像体14
aに近すぎると、記録紙Pが拍車162に接触せず搬送
性が良くない。Toner image receiver 1 as second image bearing means
Roller 14 which is a roller member for stretching and driving 4a
Generally, the radius of the driving roller 14d is R1
(Mm), a radius of 5 to 20 mm (outer diameter of 10 to 40)
mm) is used to transport the toner image receiving body 14a, but the spur 162 of the set closest to the drive roller 14d is
L1 between the center position of the driving roller 14d and the center position of the driving roller 14d
Is preferably 10 to 40 mm. Distance L1 is 4
If the distance exceeds 0 mm and the spur 14d is far from the toner image receiver 14a, the recording paper P falls before the spur due to its own weight.
If the distance is too close to a, the recording paper P does not contact the spur 162 and the transportability is not good.
【0052】更に、駆動ローラ14dに最も近い組の拍
車162の突出部162bとトナー像受像体14aの転
写材搬送面PL1との距離L2(mm)は(0.1〜
0.5)×R1とすることが好ましい。距離L2が0.
1×R1未満で、拍車162が転写材搬送面PL1に対
して高すぎると、記録紙Pが自重により拍車手前で落ち
てしまい、逆に距離L2が0.5×R1位を越え、拍車
162が転写材搬送面PL1に対して低すぎると、記録
紙Pが拍車162に接触せず搬送性が良くなくい。駆動
ローラ14dのローラ径が大きいほど分離性が悪くなる
ので、拍車162を下方に設置する必要がある。Further, the distance L2 (mm) between the protrusion 162b of the pair of spurs 162 closest to the drive roller 14d and the transfer material transporting surface PL1 of the toner image receiver 14a is (0.1 to 0.1 mm).
0.5) × R1. If the distance L2 is 0.
If the spur 162 is less than 1 × R1 and the spur 162 is too high with respect to the transfer material transport plane PL1, the recording paper P falls before the spur due to its own weight, and conversely, the distance L2 exceeds 0.5 × R1 and the spur 162 Is too low with respect to the transfer material transport surface PL1, the recording paper P does not contact the spur 162, and the transportability is not good. As the roller diameter of the drive roller 14d is larger, the separability becomes worse, so that the spur 162 needs to be installed below.
【0053】また、拍車162の突出部162bで形成
される円の半径をR2(mm)とすると、半径R2は
(0.2〜1.0)×R1とすることが好ましい。半径
R2が1.0×R1を越え大きすぎると、駆動ローラ1
4dに近づけられず、半径R2が0.2×R1未満で小
さすぎると、記録紙Pの搬送経路のわずかな変化にも対
応できなくなってしまう。If the radius of the circle formed by the projection 162b of the spur 162 is R2 (mm), the radius R2 is preferably (0.2 to 1.0) × R1. If the radius R2 exceeds 1.0 × R1 and is too large, the driving roller 1
If the radius R2 is less than 0.2 × R1 and too small, it is not possible to cope with a slight change in the conveyance path of the recording paper P.
【0054】転写材を第2の像担持手段よる分離する分
離爪について図8に示す。図8は、拍車と分離爪とを一
体に設けたものを示す図である。FIG. 8 shows a separation claw for separating the transfer material by the second image bearing means. FIG. 8 is a diagram illustrating a configuration in which a spur and a separation claw are integrally provided.
【0055】図8に示すように、前述した拍車162で
駆動ローラ14dに最も近い組の拍車162と一体に記
録紙Pをトナー像受像体14aより分離する分離爪21
0を設ける。分離爪210には例えばテフロン、ポリイ
ミド等の離型性や耐擦性の良い樹脂やポリカーボネイト
樹脂等を使用した樹脂成型部材が用いられる。拍車16
2を分離爪210と一体にして設けると、記録紙Pが分
離爪210により剥離された後、記録紙Pが直ぐに分離
爪210より離れて拍車162により案内されるため、
記録紙P上の裏面画像のトナー像の乱れや分離爪210
の汚れが起こりにくい。また、省スペース化も図れる。As shown in FIG. 8, the separation claw 21 for separating the recording paper P from the toner image receiving member 14a integrally with the spur 162 of the set closest to the drive roller 14d with the spur 162 described above.
0 is provided. As the separation claw 210, a resin molded member using a resin having good releasability and abrasion resistance, such as Teflon or polyimide, or a polycarbonate resin is used. Spur 16
When the recording paper P is provided integrally with the separation claw 210, the recording paper P is separated from the separation claw 210 immediately after being separated by the separation claw 210 and guided by the spur 162.
Disorder of the toner image on the back side image on the recording paper P and separation claw 210
Stains are less likely to occur. Also, space can be saved.
【0056】[0056]
【発明の効果】請求項1ないし4によれば、第2の像担
持手段より分離される両面に未定着のトナー像を有する
転写材が、トナー像を乱されることなく安定して定着手
段へ搬送される。According to the first to fourth aspects of the present invention, a transfer material having an unfixed toner image on both surfaces separated from the second image bearing means is stably fixed without disturbing the toner image. Transported to
【0057】請求項5ないし7によれば、裏面トナーの
付着による拍車の汚れが防止される。According to the fifth to seventh aspects, the contamination of the spur due to the adhesion of the back surface toner is prevented.
【図1】本発明にかかわる画像形成装置の一実施形態を
示すカラー画像形成装置の断面構成図である。FIG. 1 is a cross-sectional configuration diagram of a color image forming apparatus showing an embodiment of an image forming apparatus according to the present invention.
【図2】図1の第1の像担持手段の側断面図である。FIG. 2 is a side sectional view of a first image bearing unit of FIG. 1;
【図3】本発明にかかわる画像形成装置の両面のトナー
像形成状態を示す図である。FIG. 3 is a diagram illustrating a state where toner images are formed on both surfaces of the image forming apparatus according to the present invention.
【図4】搬送部を示す図である。FIG. 4 is a diagram illustrating a transport unit.
【図5】搬送部に設けられる拍車の斜視図である。FIG. 5 is a perspective view of a spur provided in a transport unit.
【図6】拍車の拡大図である。FIG. 6 is an enlarged view of a spur.
【図7】拍車と駆動ローラとの位置関係を示す図であ
る。FIG. 7 is a diagram showing a positional relationship between a spur and a driving roller.
【図8】拍車と分離爪とを一体に設けたものを示す図で
ある。FIG. 8 is a diagram showing a structure in which a spur and a separation claw are provided integrally.
10 感光体ドラム 11 スコロトロン帯電器 12 露光光学系 13 現像器 14a トナー像受像体 14c 転写器 14d 駆動ローラ 14g 裏面転写器 17 定着装置 160 搬送部 162 拍車 162b 突出部 210 分離爪 P 記録紙 PL1 転写材搬送面 REFERENCE SIGNS LIST 10 photoconductor drum 11 scorotron charger 12 exposure optical system 13 developing device 14 a toner image receiver 14 c transfer device 14 d drive roller 14 g backside transfer device 17 fixing device 160 transport unit 162 spur 162 b projecting portion 210 separation claw P recording paper PL1 transfer material Transfer surface
───────────────────────────────────────────────────── フロントページの続き (72)発明者 羽根田 哲 東京都八王子市石川町2970番地コニカ株式 会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Haneda Konica Corporation 2970 Ishikawacho, Hachioji-shi, Tokyo
Claims (7)
ー像を担持する第1の像担持手段と、 前記第1の像担持手段に担持されたトナー像が転写さ
れ、転写された該トナー像を担持する第2の像担持手段
と、 前記第1の像担持手段に担持されたトナー像を前記第2
の像担持手段および転写材の表面に転写する第1の転写
手段と、 前記第2の像担持手段に担持されたトナー像を前記転写
材の裏面に転写する第2の転写手段と、 前記転写材の両面に転写されたトナー像を定着する定着
手段とを有し、 前記転写材を前記第2の像担持手段により搬送し、前記
第2の像担持手段より転写材を分離した後、 前記定着手段により定着する画像形成装置において、 前記第2の像担持手段と前記定着手段との間に、前記第
2の像担持手段より分離した前記転写材を前記定着手段
へと搬送する拍車を有する搬送部を設け、前記搬送部を
前記第2の像担持手段の転写材搬送面の延長面の前記転
写材の裏面側に配置し、 前記第2の像担持手段を張架する前記定着手段側のロー
ラ部材の半径R1(mm)を5〜20mmとするととも
に、 前記ローラ部材に最も近い拍車の中心位置と前記ローラ
部材の中心位置との距離を10〜40mmとすることを
特徴とする画像形成装置。A first image carrying means for carrying the toner image formed by the toner image forming means; and a toner image carried by the first image carrying means is transferred. A second image carrying unit for carrying the toner image, and a toner image carried on the first image carrying unit.
A first transfer unit that transfers the toner image held by the second image holding unit to a back surface of the transfer material; and a transfer unit that transfers the toner image held by the second image holding unit to the back surface of the transfer material. Fixing means for fixing the toner images transferred to both surfaces of the material, wherein the transfer material is transported by the second image bearing means, and the transfer material is separated from the second image bearing means. In the image forming apparatus for fixing by a fixing unit, a spur that conveys the transfer material separated from the second image holding unit to the fixing unit is provided between the second image holding unit and the fixing unit. A transport unit, and the transport unit is disposed on the back side of the transfer material on the extension surface of the transfer material transport surface of the second image bearing unit; and the fixing unit side on which the second image bearing unit is stretched. The radius R1 (mm) of the roller member is 5 to 20 mm Together, the image forming apparatus, characterized in that the distance between the center position of the closest spur to the roller member and the center position of the roller member with the 10 to 40 mm.
を、前記転写材搬送面の延長面より裏面側に(0.1〜
0.5)×R1離して設けることを特徴とする請求項1
に記載の画像形成装置。2. An upper end of the spur closest to the roller member is positioned on the back side of the extension surface of the transfer material conveying surface (from 0.1 to 0.1).
0.5) × R1 apart.
An image forming apparatus according to claim 1.
2を、(0.2〜1.0)×R1とすることを特徴とす
る請求項1または2に記載の画像形成装置。3. The radius R of the spur closest to said roller member.
3. The image forming apparatus according to claim 1, wherein 2 is (0.2 to 1.0) × R1.
前記第2の像担持手段より前記転写材を分離する分離爪
を設けることを特徴とする請求項1〜3の何れか1項に
記載の画像形成装置。4. The image forming apparatus according to claim 1, further comprising: a separation claw for separating the transfer material from the second image bearing means integrally with a spur closest to the roller member. Image forming apparatus.
電気的にフローティングとするか、或いはトナーと同極
性に帯電することを特徴とする請求項1〜4の何れか1
項に記載の画像形成装置。5. The image forming apparatus according to claim 1, wherein the spur is electrically floating with respect to the image forming apparatus main body or is charged with the same polarity as toner.
Item 10. The image forming apparatus according to item 1.
特徴とする請求項1〜4の何れか1項に記載の画像形成
装置。6. The image forming apparatus according to claim 1, wherein the spur is formed of an insulating member.
ことを特徴とする請求項1〜4の何れか1項に記載の画
像形成装置。7. The image forming apparatus according to claim 1, wherein the spur is grounded via a high-resistance member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21332097A JP3750297B2 (en) | 1997-08-07 | 1997-08-07 | Image forming apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21332097A JP3750297B2 (en) | 1997-08-07 | 1997-08-07 | Image forming apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1152645A true JPH1152645A (en) | 1999-02-26 |
JP3750297B2 JP3750297B2 (en) | 2006-03-01 |
Family
ID=16637206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21332097A Expired - Fee Related JP3750297B2 (en) | 1997-08-07 | 1997-08-07 | Image forming apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3750297B2 (en) |
-
1997
- 1997-08-07 JP JP21332097A patent/JP3750297B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP3750297B2 (en) | 2006-03-01 |
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