JPH04360179A - Electrophotographic printer - Google Patents
Electrophotographic printerInfo
- Publication number
- JPH04360179A JPH04360179A JP13641191A JP13641191A JPH04360179A JP H04360179 A JPH04360179 A JP H04360179A JP 13641191 A JP13641191 A JP 13641191A JP 13641191 A JP13641191 A JP 13641191A JP H04360179 A JPH04360179 A JP H04360179A
- Authority
- JP
- Japan
- Prior art keywords
- endless belt
- image
- transferring
- belt
- fixing roller
- 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.)
- Pending
Links
- 238000003825 pressing Methods 0.000 claims description 2
- 230000003578 releasing effect Effects 0.000 claims 1
- 230000000007 visual effect Effects 0.000 abstract 2
- 230000003068 static effect Effects 0.000 abstract 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Delivering By Means Of Belts And Rollers (AREA)
- Fixing For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は電子写真式印刷装置に関
する。FIELD OF THE INVENTION This invention relates to electrophotographic printing apparatus.
【0002】0002
【従来の技術】従来、エンドレスベルトにより像担持体
(感光ドラム)から記録媒体(用紙)にトナー像を転写
する電子写真式印刷装置は、特願平3−95929号に
記載されたとおり、エンドレスベルトを駆動させるのに
、一次転写器や二次転写定着器等から独立した搬送手段
を持っていた。[Prior Art] Conventionally, an electrophotographic printing apparatus that transfers a toner image from an image bearing member (photosensitive drum) to a recording medium (paper) using an endless belt is known as an endless belt, as described in Japanese Patent Application No. 3-95929. To drive the belt, it had a conveyance means independent from the primary transfer device, secondary transfer fixing device, etc.
【0003】0003
【発明が解決しようとする課題】上述した従来の電子写
真式印刷装置は、エンドレスベルトを駆動する搬送手段
を一次転写器や二次転写定着器とは独立した部分に持っ
ている。したがって、その分余分なスペースを必要とし
装置をコンパクトにできず、また、部品点数も増加し、
コストアップの一因となっていた。The conventional electrophotographic printing apparatus described above has a conveying means for driving the endless belt in a portion independent of the primary transfer device and the secondary transfer fixing device. Therefore, extra space is required, making it impossible to make the device compact, and the number of parts increases.
This was a cause of increased costs.
【0004】また、二次転写定着部における負荷が大き
いため、ベルトの張力変動が大きく、ベルトが伸びきっ
たり切断する等の原因となったり、一次転写部,2次転
写定着部でのベルト送り速度の変動原因となっていた。[0004] Furthermore, since the load on the secondary transfer/fixing section is large, the belt tension fluctuates greatly, which may cause the belt to stretch or break, or cause belt feeding in the primary transfer section and the secondary transfer/fixing section. This caused the speed to fluctuate.
【0005】[0005]
【課題を解決するための手段】本発明の電子写真式印刷
装置は、像担持体に像を形成する像形成器と、該像担持
体上の像を静電気力によりエンドレスベルトに転写する
一次転写器と、エンドレスベルト上に形成された像を媒
体上に転写及び定着を同時に行う二次転写定着ローラと
を有し、エンドレスベルトを二次転写定着ローラの周囲
に形成された搬送手段によって駆動することを特徴とす
る。[Means for Solving the Problems] The electrophotographic printing apparatus of the present invention includes an image forming device that forms an image on an image carrier, and a primary transfer that transfers the image on the image carrier to an endless belt using electrostatic force. and a secondary transfer fixing roller that simultaneously transfers and fixes the image formed on the endless belt onto a medium, and the endless belt is driven by a conveying means formed around the secondary transfer fixing roller. It is characterized by
【0006】[0006]
【実施例】次に本発明の実施例について図面を参照して
説明する。Embodiments Next, embodiments of the present invention will be described with reference to the drawings.
【0007】図1を参照すると、本発明の第一の実施例
は、上述した特願平3−95925号に記載された電子
写真式印刷装置と同様なプロセスで印刷を行なうが、二
次転写定着手段としてヒートローラ9を用い、その両端
にスプロケット12を設け、エンドレスベルト6の駆動
をスプロケットを介してヒートローラ9の駆動力で行う
。Referring to FIG. 1, the first embodiment of the present invention performs printing using a process similar to that of the electrophotographic printing apparatus described in the above-mentioned Japanese Patent Application No. 3-95925, but uses secondary transfer. A heat roller 9 is used as the fixing means, sprockets 12 are provided at both ends of the heat roller 9, and the endless belt 6 is driven by the driving force of the heat roller 9 via the sprocket.
【0008】すなわち、帯電器1が感光体(OPC)4
のドラム表面をコロナ放電によって一様に帯電させ、次
に露光器2によってドラム上に静電潜像を形成させる。
現像器3は感光体(OPC)4のドラム上に形成された
潜像に負帯電させたトナーを付着させ可視化し、転写部
でドラム上のトナー像を弾性ローラを用いた転写器5の
静電気力によって、ドラム面から離型性のエンドレスベ
ルト6に転写する。エンドレスベルト6はモータ15に
より回転駆動を受けるヒートローラ9の端部周囲に形成
されたスプロケット12にその端部を係合させており、
ヒートローラ9の回転によって駆動されトナー像7を定
着部まで搬送していく。定着部では、熱源としてのハロ
ゲンランプ8を内包したヒートローラ9と加圧用のプレ
ッシャーローラ10と間に記録紙11を通過させ、熱圧
力定着によってエンドレスベルト6のベルト上の未定着
トナー像7を記録紙11に同時に転写及び定着させる。That is, the charger 1 is connected to the photoconductor (OPC) 4.
The surface of the drum is uniformly charged by corona discharge, and then an electrostatic latent image is formed on the drum by the exposure device 2. The developing device 3 attaches negatively charged toner to the latent image formed on the drum of the photoreceptor (OPC) 4 to visualize it, and in the transfer section, the toner image on the drum is transferred to the electrostatic charge of the transfer device 5 using an elastic roller. The force transfers the image from the drum surface to the releasable endless belt 6. The endless belt 6 has its end engaged with a sprocket 12 formed around the end of the heat roller 9 which is rotationally driven by a motor 15.
It is driven by the rotation of the heat roller 9 and conveys the toner image 7 to the fixing section. In the fixing section, a recording paper 11 is passed between a heat roller 9 containing a halogen lamp 8 as a heat source and a pressure roller 10 for applying pressure, and the unfixed toner image 7 on the endless belt 6 is fixed by heat and pressure fixing. The images are transferred and fixed onto the recording paper 11 at the same time.
【0009】次に本発明の第二の実施例について図2を
参照して説明する。Next, a second embodiment of the present invention will be described with reference to FIG.
【0010】本発明の第二の実施例は、ベルト6の張り
の調整を、ヒートローラ9の下流に設けたローラ13を
用いたベルトの張り調整機構で行っている。その他の構
成は、第一の実施例と同様である。In the second embodiment of the present invention, the tension of the belt 6 is adjusted by a belt tension adjustment mechanism using a roller 13 provided downstream of the heat roller 9. The other configurations are the same as in the first embodiment.
【0011】このように、エンドレスベルト6の張りの
調整をベルトの搬送手段の下流側に設けたベルトの張り
調整機構であるローラ13によって行うので、エンドレ
スベルト6のたるみがなくなり、一次転写部,二次転写
定着部でのベルトの送り速度の変動がなくなる。また、
ベルトの調整機構をベルトの搬送手段の上流に設けた時
に生じる、ベルトの負荷変動による一次転写部、または
二次転写定着部、または両方のベルトの送り速度が変動
するという欠点が解消される。As described above, since the tension of the endless belt 6 is adjusted by the roller 13, which is a belt tension adjustment mechanism provided downstream of the belt conveyance means, the endless belt 6 is not slackened, and the primary transfer section, There is no fluctuation in belt feeding speed in the secondary transfer/fixing section. Also,
This eliminates the drawback that the feeding speed of the primary transfer section, the secondary transfer fixing section, or both belts fluctuates due to load fluctuations on the belt, which occurs when the belt adjustment mechanism is provided upstream of the belt conveying means.
【0012】0012
【発明の効果】以上説明したように、本発明は、エンド
レスベルトの搬送を二次転写定着ローラによって行なう
ので、他に専用の搬送手段を必要とせず、省スペース、
部品点数の小量化、コストダウンが可能となる。また、
二次転写定着部の負荷が大きいために生ずるエンドレス
ベルトの張力の変動を低減させることができる。As explained above, in the present invention, since the endless belt is conveyed by the secondary transfer fixing roller, there is no need for any other dedicated conveyance means, and space-saving and
It is possible to reduce the number of parts and reduce costs. Also,
It is possible to reduce fluctuations in the tension of the endless belt caused by a large load on the secondary transfer fixing section.
【図1】本発明の第一の実施例の構成を示す断面図であ
る。FIG. 1 is a sectional view showing the configuration of a first embodiment of the present invention.
【図2】本発明の第二の実施例の構成を示す断面図であ
る。FIG. 2 is a sectional view showing the configuration of a second embodiment of the present invention.
Claims (2)
る像形成器と、前記像担持体上の可視像を離型性を有す
るエンドレスベルトに静電気力により一次転写する一次
転写器と、前記エンドレスベルトを前記像形成面にて記
録媒体と接触させ加圧および加熱することにより前記エ
ンドレスベルト上に形成された像を前記記録媒体上に二
次転写及び定着を同時に行う二次転写定着ローラとを有
し、前記二次転写定着ローラの周囲に前記エンドレスベ
ルトの搬送手段を設けたことを特徴とする電子写真式印
刷装置。1. An image forming device that forms a visible image on an image forming surface of an image carrier, and a primary transfer device that primarily transfers the visible image on the image carrier to an endless belt having a releasing property by electrostatic force. and a secondary device that simultaneously transfers and fixes the image formed on the endless belt onto the recording medium by bringing the endless belt into contact with the recording medium at the image forming surface and applying pressure and heat. 1. An electrophotographic printing apparatus comprising: a transfer fixing roller; and a conveying means for the endless belt is provided around the secondary transfer fixing roller.
ローラの下流側に前記エンドレスベルトの張力を調整す
る張力調整機構を係合させた請求項1に記載の電子写真
式印刷装置。2. The electrophotographic printing apparatus according to claim 1, wherein a tension adjustment mechanism for adjusting the tension of the endless belt is engaged on the downstream side of the transfer fixing roller of the endless belt.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13641191A JPH04360179A (en) | 1991-06-07 | 1991-06-07 | Electrophotographic printer |
EP19920107046 EP0510680A3 (en) | 1991-04-26 | 1992-04-24 | Electrophotographic printing apparatus having an endless belt for primary and secondary transfer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13641191A JPH04360179A (en) | 1991-06-07 | 1991-06-07 | Electrophotographic printer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04360179A true JPH04360179A (en) | 1992-12-14 |
Family
ID=15174537
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13641191A Pending JPH04360179A (en) | 1991-04-26 | 1991-06-07 | Electrophotographic printer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04360179A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7643767B2 (en) | 2006-03-02 | 2010-01-05 | Ricoh Co., Ltd. | Transfer-fixing unit and image forming apparatus for enhanced image quality |
US7711301B2 (en) | 2006-03-10 | 2010-05-04 | Ricoh Company, Ltd. | Image transfer device for image forming apparatus |
-
1991
- 1991-06-07 JP JP13641191A patent/JPH04360179A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7643767B2 (en) | 2006-03-02 | 2010-01-05 | Ricoh Co., Ltd. | Transfer-fixing unit and image forming apparatus for enhanced image quality |
US7711301B2 (en) | 2006-03-10 | 2010-05-04 | Ricoh Company, Ltd. | Image transfer device for image forming apparatus |
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