JP4619711B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP4619711B2
JP4619711B2 JP2004202800A JP2004202800A JP4619711B2 JP 4619711 B2 JP4619711 B2 JP 4619711B2 JP 2004202800 A JP2004202800 A JP 2004202800A JP 2004202800 A JP2004202800 A JP 2004202800A JP 4619711 B2 JP4619711 B2 JP 4619711B2
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toner
back surface
waste toner
transfer
image
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JP2006023612A (en
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智 内田
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Ricoh Co Ltd
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Ricoh Co Ltd
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本発明は、複写機、ファクシミリ、プリンタ等の画像形成装置におけるトナー転写装置に関し、とくに、転写紙裏面へのトナー塗布を行なう裏面転写装置を有する画像形成装置に関するものである。   The present invention relates to a toner transfer device in an image forming apparatus such as a copying machine, a facsimile machine, and a printer, and more particularly to an image forming apparatus having a back surface transfer device that applies toner to the back surface of a transfer sheet.

従来から、裏面転写に関する技術についてはその方法が知られているが、裏面の情報を消去する秘匿装置に関するものは知られていない。   Conventionally, a method related to the technology related to the back surface transfer is known, but a technology related to a concealment device that erases information on the back surface is not known.

資源の有効利用とゴミの低減のために、従来から表面に画像形成が行われた転写紙を廃棄せずに、白紙の状態にある裏面を利用して画像形成を行う裏紙の再利用方法が一般に行われている。しかし、裏紙を画像形成用紙として再利用する場合には、表面側に記載された情報が漏れる虞がある。情報の漏洩を防止するためにコストをかけて表面の画像を消去する必要が生じるとすれば、コストメリットを考慮すれば、裏紙を再利用するメリットは喪失される。そこで、コストをかけずに表面画像を消去、或いは読み取り不能な状態にすることが望まれている。
そこで本発明の目的は、上記の実情を考慮して、紙資源の有効利用が可能となり、また、廃トナーを用いることで作像用のトナーを消費させることが無く、トナーイールド(歩留まり)を確保することが可能になる画像形成装置を提供することにある。
A method for reusing a backing paper that forms an image using the back side of a blank sheet without discarding the transfer paper on which the image has been formed on the front side in order to effectively use resources and reduce dust Is generally done. However, when the backing paper is reused as the image forming paper, there is a possibility that information written on the front side may leak. If it is necessary to erase the image on the surface in order to prevent leakage of information, the merit of reusing the backing paper is lost if the cost merit is taken into consideration. Therefore, it is desired to erase the surface image or make it unreadable without cost.
Accordingly, an object of the present invention is to make it possible to effectively use paper resources in consideration of the above-mentioned situation, and to use toner to avoid toner consumption for image formation and to reduce toner yield (yield). An object of the present invention is to provide an image forming apparatus that can be secured.

上記の課題を解決するために、本発明の画像形成装置は、像担持体と、像担持体上の残留トナーを除去、回収するクリーニング装置と、クリーニング装置により回収された廃トナーを回収する回収装置と、転写紙上に形成されたトナー像を熱定着する定着装置と、を備えた画像形成装置において、転写紙のトナー像形成面とは逆の裏面にトナーを付着させる裏面転写装置を定着装置に設け、前記裏面転写装置によって転写紙の裏面に付着させるトナーが、画像形成において発生した廃トナーであり、前記定着装置は、加熱ローラと加圧ローラとからなり、前記裏面転写装置は、前記加圧ローラに圧接するように設けられた廃トナー塗布ローラを有し、前記回収装置によって回収した廃トナーを、前記廃トナー塗布ローラを介して前記加圧ローラの外周に塗布し、前記定着装置を通過する前記転写紙の裏面に前記廃トナーを付着し、定着することを特徴とする。 In order to solve the above problems, an image forming apparatus of the present invention includes an image carrier, a cleaning device that removes and collects residual toner on the image carrier, and a collection that collects waste toner collected by the cleaning device. And a fixing device that thermally fixes a toner image formed on the transfer paper, and the fixing device includes a back transfer device that attaches toner to the back surface opposite to the toner image forming surface of the transfer paper The toner attached to the back surface of the transfer paper by the back surface transfer device is waste toner generated in image formation, the fixing device comprises a heating roller and a pressure roller, and the back surface transfer device A waste toner application roller provided so as to be in pressure contact with the pressure roller, and the waste toner recovered by the recovery device is passed through the waste toner application roller through the pressure roller; Outer periphery coating of adhering the waste toner to the back surface of the transfer sheet passing through the fixing device, characterized by fixing.

本発明によれば、感光体上に静電潜像を作り、該静電潜像を現像する現像器と、形成されたトナー像を転写紙に転写し、画像を形成し、トナー像を定着せしめる定着装置と残留トナーをクリーニングするクリーニング装置を具備する画像形成装置において、前記残留トナーを回収収納するトナー回収装置を設置し、該トナー回収装置を、前記転写装置と前記定着装置の間に設置し、転写紙の裏面にトナーを付着させる装置を具備した転写紙裏面へのトナー塗布装置を具備することを特徴とする画像形成装置により、紙資源の有効利用が可能となる。また、廃トナーを用いることで作像用のトナーを消費させることが無いためトナーイールドを確保することが可能になる。   According to the present invention, an electrostatic latent image is formed on a photosensitive member, a developing device that develops the electrostatic latent image, and the formed toner image is transferred to a transfer paper, an image is formed, and the toner image is fixed. An image forming apparatus comprising a fixing device for cleaning and a cleaning device for cleaning residual toner, wherein a toner recovery device for recovering and storing the residual toner is installed, and the toner recovery device is installed between the transfer device and the fixing device In addition, the image forming apparatus including the toner application device on the back surface of the transfer paper including the device for attaching the toner to the back surface of the transfer paper enables effective use of paper resources. Further, by using waste toner, toner for image formation is not consumed, so that toner yield can be secured.

以下、図面を参照して、本発明の実施の形態を詳細に説明する。図1は本発明の裏面トナー塗布を行なう裏面転写装置を具備できる画像形成装置である、カラー複写機の概略構成を示す正面図である。本発明に係わる本発明はカラー複写機の作像系にクリーニング部が付加された場合の転写装置に関する発明である。
この複写機は、複数の支持ローラに掛け回された潜像担持体としての感光体(像担持体)1を4個備えている。感光体1は図中の矢印で示した方向に回転駆動され、その周りには、帯電器4a、現像器4b、一次転写バイアスローラ4c、クリーニング装置4dが配置され、これらは一体に組み込まれている(PCU11)。
この装置(PCU)11の回りには光書き込みユニット2、中間転写体としての中間転写ベルト(像担持体)3などが配置されている。本複写機で画像形成動作(プリント動作)を実行すると、各色信号に基づき感光体1に静電潜像が作られ、色毎に現像される。
感光体1と中間転写ベルト(転写装置)3との接触部においては、一次転写バイアスローラ4cにトナーと逆極性の電荷を印加することにより、感光体1上のトナー像が中間転写ベルト3上に転写される。このトナー像の形成および転写動作を4回繰り返すことにより、中間転写ベルト3上に4色重ねのカラートナー像が形成される。
この中間転写ベルト3上のカラートナー像は、給紙カセット5から搬送ローラ対6、7によって送られてきた記録材としての転写紙に、2次転写部材としての紙転写ベルト(転写装置)8によって転写される。カラートナー像が転写された転写紙は、定着装置9(加熱ローラ18、加圧ローラ14)に搬送され、前記トナー像が溶融定着される。
感光体1(PCU11)、中間転写ベルト(像担持体)3、8には各々クリーニング部が付加されており(例えば、4d、10、12部分)、付着残留したトナーを廃トナーとして回収できるようになっている。本発明はこの回収された廃トナーを利用し、秘匿文書がある紙でも裏面が使用可能になる装置を提供するものである。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a schematic configuration of a color copying machine which is an image forming apparatus which can include a back surface transfer device for applying a back surface toner of the present invention. The present invention according to the present invention relates to a transfer apparatus when a cleaning unit is added to an image forming system of a color copying machine.
This copying machine includes four photosensitive members (image carriers) 1 as latent image carriers that are wound around a plurality of support rollers. The photosensitive member 1 is rotationally driven in the direction indicated by the arrow in the figure, and around it, a charger 4a, a developing device 4b, a primary transfer bias roller 4c, and a cleaning device 4d are arranged, and these are integrally incorporated. (PCU11).
Around this apparatus (PCU) 11, an optical writing unit 2, an intermediate transfer belt (image carrier) 3 as an intermediate transfer member, and the like are arranged. When an image forming operation (printing operation) is executed by the copying machine, an electrostatic latent image is formed on the photosensitive member 1 based on each color signal and is developed for each color.
At the contact portion between the photosensitive member 1 and the intermediate transfer belt (transfer device) 3, the toner image on the photosensitive member 1 is transferred onto the intermediate transfer belt 3 by applying a charge having a polarity opposite to that of the toner to the primary transfer bias roller 4 c. Is transcribed. By repeating this toner image formation and transfer operation four times, a four-color color toner image is formed on the intermediate transfer belt 3.
The color toner image on the intermediate transfer belt 3 is transferred to a transfer sheet as a recording material sent from the paper feed cassette 5 by the conveying roller pairs 6 and 7 to a paper transfer belt (transfer device) 8 as a secondary transfer member. Is transcribed by. The transfer paper on which the color toner image is transferred is conveyed to the fixing device 9 (heating roller 18 and pressure roller 14), and the toner image is melted and fixed.
The photosensitive member 1 (PCU 11) and the intermediate transfer belts (image carriers) 3 and 8 are each provided with a cleaning unit (for example, 4d, 10 and 12 portions) so that the remaining toner can be collected as waste toner. It has become. The present invention provides an apparatus that uses the collected waste toner and enables the back side to be used even on paper with confidential documents.

図2は裏面秘匿転写装置を定着部に設けた場合を説明する概略ブロック図である。各クリーニング部(例えば、4d、10、12部分)から回収された廃トナーは廃トナータンク13に一旦集められる。
廃トナータンク13、廃トナー搬送コイル17は、残留トナーを回収・収納するトナー回収装置を構成している。廃トナー塗布ローラ15と、加圧ローラ14は、裏面転写装置を構成している。
この集められた廃トナーを定着装置9の加圧ローラ14に圧接するように設けられた廃トナー塗布ローラ15側のボトルA16に廃トナー搬送コイル17で搬送する。このとき廃トナー搬送コイル17は廃トナー塗布ローラ15に近接するように設置しできるだけ直接廃トナー塗布ローラ15に廃トナーが付着するように設ける。
また、この廃トナー搬送コイル17は選択的に駆動することができるようにしておき、裏面を秘匿したいときのみ駆動が掛かることで廃トナー塗布ローラ15に選択的にトナーを付着させ、結果として裏面を隠したいときのみトナーを付着させることができる。
つまり、本発明では、各クリーニング部により掻き落とされ、回収された廃トナーをそのまま廃棄するのではなく、廃トナー塗布ローラ15を介して加圧ローラの外周に塗布することにより、定着装置9を通過する転写紙の下面(加圧ローラ側面)に廃トナーを付着、定着させるように構成している。裏紙を定着する場合には、加圧ローラ14側の面には印刷済みの表面(トナー像形成面)が位置しているため、この表面側に廃トナーを付着、定着させることによって表面側の画像が塗りつぶされることとなり、情報の漏洩が阻止される。
FIG. 2 is a schematic block diagram for explaining a case where the back side secret transfer device is provided in the fixing unit. The waste toner collected from each cleaning unit (for example, 4d, 10 and 12 parts) is once collected in the waste toner tank 13.
The waste toner tank 13 and the waste toner transport coil 17 constitute a toner collection device that collects and stores residual toner. The waste toner application roller 15 and the pressure roller 14 constitute a back surface transfer device.
The collected waste toner is transported by the waste toner transport coil 17 to the bottle A16 on the side of the waste toner application roller 15 provided so as to come into pressure contact with the pressure roller 14 of the fixing device 9. At this time, the waste toner carrying coil 17 is installed so as to be close to the waste toner application roller 15 so that the waste toner adheres directly to the waste toner application roller 15 as much as possible.
The waste toner carrying coil 17 can be selectively driven, and is driven only when it is desired to conceal the back surface, so that the toner is selectively attached to the waste toner application roller 15, resulting in the back surface. The toner can be attached only when it is desired to hide the toner.
In other words, according to the present invention, the waste toner that is scraped off by each cleaning unit and collected is not discarded as it is, but is applied to the outer periphery of the pressure roller via the waste toner application roller 15 to thereby fix the fixing device 9. The configuration is such that waste toner adheres to and is fixed to the lower surface (side surface of the pressure roller) of the transfer paper passing therethrough. When fixing the backing paper, since the printed surface (toner image forming surface) is located on the surface on the pressure roller 14 side, the waste toner is attached to and fixed on the surface side. Will be painted out and information leakage will be prevented.

本発明の裏面トナー塗布を行なう裏面転写装置を具備できる画像形成装置である、カラー複写機の概略構成を示す正面図である。1 is a front view showing a schematic configuration of a color copying machine, which is an image forming apparatus that can include a back surface transfer device for applying a back surface toner of the present invention. 裏面秘匿転写装置を定着部に設けた場合を説明する概略ブロック図である。It is a schematic block diagram explaining the case where a back surface secrecy transfer device is provided in a fixing part.

符号の説明Explanation of symbols

1 感光体
3 転写装置(中間転写ベルト)
8 転写装置(紙転写ベルト)
9 定着装置
10 クリーニング部
11 クリーニング部(PCU)
12 クリーニング部
13 廃トナータンク
14 加圧ローラ
15 トナー回収装置(廃トナー塗布ローラ、1次転写バイアスローラ)
16 トナー回収装置(ボトル)
17 トナー回収装置(廃トナー搬送コイル)
19 クリーニング部(クリーニングブレード)
1 Photoconductor 3 Transfer device (intermediate transfer belt)
8 Transfer device (paper transfer belt)
9 Fixing device 10 Cleaning unit 11 Cleaning unit (PCU)
12 Cleaning unit 13 Waste toner tank 14 Pressure roller 15 Toner recovery device (waste toner application roller, primary transfer bias roller)
16 Toner recovery device (bottle)
17 Toner recovery device (waste toner transfer coil)
19 Cleaning section (cleaning blade)

Claims (1)

像担持体と、像担持体上の残留トナーを除去、回収するクリーニング装置と、クリーニング装置により回収された廃トナーを回収する回収装置と、転写紙上に形成されたトナー像を熱定着する定着装置と、を備えた画像形成装置において、
転写紙のトナー像形成面とは逆の裏面にトナーを付着させる裏面転写装置を定着装置に設け、
前記裏面転写装置によって転写紙の裏面に付着させるトナーが、画像形成において発生した廃トナーであり、
前記定着装置は、加熱ローラと加圧ローラとからなり、前記裏面転写装置は、前記加圧ローラに圧接するように設けられた廃トナー塗布ローラを有し、
前記回収装置によって回収した廃トナーを、前記廃トナー塗布ローラを介して前記加圧ローラの外周に塗布し、前記定着装置を通過する前記転写紙の裏面に前記廃トナーを付着し、定着する
ことを特徴とする画像形成装置。
Image carrier, cleaning device for removing and collecting residual toner on image carrier, collection device for collecting waste toner collected by cleaning device, and fixing device for thermally fixing toner image formed on transfer paper In an image forming apparatus comprising:
The fixing device is provided with a back surface transfer device that attaches toner to the back surface opposite to the toner image forming surface of the transfer paper ,
The toner attached to the back surface of the transfer paper by the back surface transfer device is waste toner generated in image formation,
The fixing device includes a heating roller and a pressure roller, and the back surface transfer device includes a waste toner application roller provided so as to be in pressure contact with the pressure roller,
The waste toner recovered by the recovery device is applied to the outer periphery of the pressure roller via the waste toner application roller, and the waste toner is attached to the back surface of the transfer paper passing through the fixing device and fixed. An image forming apparatus.
JP2004202800A 2004-07-09 2004-07-09 Image forming apparatus Expired - Fee Related JP4619711B2 (en)

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JP5029633B2 (en) * 2009-03-05 2012-09-19 コニカミノルタビジネステクノロジーズ株式会社 Image forming apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05333747A (en) * 1992-05-27 1993-12-17 Ricoh Co Ltd Image forming device
JPH07199738A (en) * 1993-12-28 1995-08-04 Toshiba Corp Image forming device
JPH10149058A (en) * 1996-11-19 1998-06-02 Nec Eng Ltd Image forming device
JPH10339974A (en) * 1997-04-07 1998-12-22 Ricoh Co Ltd Image forming device
JP2000347467A (en) * 1999-06-04 2000-12-15 Sharp Corp Device and method for image formation
JP2004077857A (en) * 2002-08-20 2004-03-11 Murata Mach Ltd Image forming apparatus
JP2004177754A (en) * 2002-11-28 2004-06-24 Konica Minolta Holdings Inc Image forming apparatus
JP2004294462A (en) * 2003-03-25 2004-10-21 Fuji Xerox Co Ltd Waste toner treating method and image forming apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05333747A (en) * 1992-05-27 1993-12-17 Ricoh Co Ltd Image forming device
JPH07199738A (en) * 1993-12-28 1995-08-04 Toshiba Corp Image forming device
JPH10149058A (en) * 1996-11-19 1998-06-02 Nec Eng Ltd Image forming device
JPH10339974A (en) * 1997-04-07 1998-12-22 Ricoh Co Ltd Image forming device
JP2000347467A (en) * 1999-06-04 2000-12-15 Sharp Corp Device and method for image formation
JP2004077857A (en) * 2002-08-20 2004-03-11 Murata Mach Ltd Image forming apparatus
JP2004177754A (en) * 2002-11-28 2004-06-24 Konica Minolta Holdings Inc Image forming apparatus
JP2004294462A (en) * 2003-03-25 2004-10-21 Fuji Xerox Co Ltd Waste toner treating method and image forming apparatus

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