JP2011065081A5 - - Google Patents
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- JP2011065081A5 JP2011065081A5 JP2009217644A JP2009217644A JP2011065081A5 JP 2011065081 A5 JP2011065081 A5 JP 2011065081A5 JP 2009217644 A JP2009217644 A JP 2009217644A JP 2009217644 A JP2009217644 A JP 2009217644A JP 2011065081 A5 JP2011065081 A5 JP 2011065081A5
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本発明の画像形成装置は、トナー像を担持する中間転写ベルトと、記録材を担持する転写ベルトとを備え、前記中間転写ベルトと前記転写ベルトとが前記中間転写ベルトの回転方向に沿って当接面を形成するものである。そして、前記中間転写ベルトと前記転写ベルトとを介して互いに対向するように前記中間転写ベルトの内側と前記転写ベルトの内側にそれぞれ配置され、前記当接面の前記回転方向上流側部分で互いの間を加圧するとともに電界を印加可能な第１の加圧電極対と、前記中間転写ベルトと前記転写ベルトとを介して互いに対向するように前記中間転写ベルトの内側と前記転写ベルトの内側にそれぞれ配置され、前記当接面の前記回転方向下流側部分で互いの間を加圧するとともに電界を印加可能な第２の加圧電極対と、を備え、前記第１の加圧電極対に、前記中間転写ベルトから記録材へトナーが転写する方向の電界を印加するとともに、前記第２の加圧電極対のそれぞれを等電位にする転写モードを実行可能である。 The image forming apparatus of the present invention includes an intermediate transfer belt that carries a toner image and a transfer belt that carries a recording material, and the intermediate transfer belt and the transfer belt contact each other along the rotation direction of the intermediate transfer belt. The contact surface is formed . And arranged inside the intermediate transfer belt and inside the transfer belt so as to face each other through the intermediate transfer belt and the transfer belt, respectively, and at the upstream portion in the rotation direction of the contact surface. A first pressurizing electrode pair capable of pressurizing and applying an electric field, and an inner side of the intermediate transfer belt and an inner side of the transfer belt so as to face each other through the intermediate transfer belt and the transfer belt, respectively. And a second pressure electrode pair that pressurizes each other at the downstream side portion in the rotational direction of the contact surface and is capable of applying an electric field, and the first pressure electrode pair includes the second pressure electrode pair, It is possible to execute a transfer mode in which an electric field in a direction in which toner is transferred from the intermediate transfer belt to the recording material is applied, and each of the second pressure electrode pairs is equipotential .
トナー像を担持する中間転写ベルト６と記録材Ｐを担持する転写ベルト２４とが当接して中間転写ベルト６の回転方向に連続した長さＬの当接部Ｔ２（転写ニップ領域）を形成する。対向ローラ２１と二次転写ローラ９と高圧電源４１は、第１の加圧電極対を構成しており、連続した当接部Ｔ２の上流側部分である上流転写部Ｎ１を加圧するとともに、上流側の高圧電源４１によって転写電圧を印加可能である。対向ローラ２３と二次転写ローラ１０は、第２の加圧電極対を構成しており、連続した当接部Ｔ２の下流側部分である下流転写部Ｎ２を加圧する。また、下流側の高圧電源４２によって下流転写部Ｎ２に転写電圧を印加可能である。二次転写ローラ９は、第１の転写ローラに対応し、二次転写ローラ１０は、第２の転写ローラに対応している。 The intermediate transfer belt 6 carrying the toner image and the transfer belt 24 carrying the recording material P are in contact with each other to form a contact portion T2 (transfer nip region) having a length L continuous in the rotation direction of the intermediate transfer belt 6. . The opposing roller 21, the secondary transfer roller 9, and the high-voltage power source 41 constitute a first pressure electrode pair that pressurizes the upstream transfer portion N1 that is the upstream portion of the continuous contact portion T2 and upstream. The transfer voltage can be applied by the high-voltage power supply 41 on the side. The opposing roller 23 and the secondary transfer roller 10 constitute a second pressure electrode pair , and pressurize the downstream transfer portion N2 that is the downstream portion of the continuous contact portion T2. Further, a transfer voltage can be applied to the downstream transfer portion N2 by the high-voltage power source 42 on the downstream side. The secondary transfer roller 9 corresponds to the first transfer roller, and the secondary transfer roller 10 corresponds to the second transfer roller.
画像形成装置１００には、第１の転写モード（薄紙モード）が設定されている。第１の転写モードでは、高圧電源４１が第１の加圧電極対（９）に転写電圧を印加するとともに、高圧電源４２が第２の加圧電極対（１０、２３）を接地電位に接続する。高圧電源４１は、第１の転写モードでは、上流側の二次転写ローラ９に＋３０〜＋４０μＡの電流を流して、中間転写ベルト６上のトナー像を記録材Ｐに転写させる。このとき、高圧電源４２は、下流側の二次転写ローラ１０を対向ローラ２３と同様に接地電位に落とすことによって、転写ベルト２４の電荷を除去する。 In the image forming apparatus 100, the first transfer mode (thin paper mode) is set. In the first transfer mode, the high voltage power supply 41 applies a transfer voltage to the first pressure electrode pair (9), and the high voltage power supply 42 connects the second pressure electrode pair (10, 23) to the ground potential. To do. In the first transfer mode, the high-voltage power supply 41 causes a current of +30 to +40 μA to flow through the upstream secondary transfer roller 9 to transfer the toner image on the intermediate transfer belt 6 to the recording material P. At this time, the high-voltage power supply 42 removes the electric charge of the transfer belt 24 by dropping the secondary transfer roller 10 on the downstream side to the ground potential similarly to the counter roller 23.
＜転写ベルトと記録材の除電＞
図８は下流転写部における除電の説明図である。図８の（ａ）に示すように、第２の加圧電極対（１０、２３）は、連続した当接部Ｔ２の下流側部分を加圧するとともに記録材Ｐを挟持した反対面を通じて中間転写ベルト６と転写ベルト２４とを電気的に接続可能である。
<Static removal of transfer belt and recording material>
FIG. 8 is an explanatory diagram of static elimination at the downstream transfer portion. As shown in FIG. 8A, the second pressure electrode pair (10, 23) presses the downstream portion of the continuous contact portion T2 and intermediate transfer through the opposite surface sandwiching the recording material P. The belt 6 and the transfer belt 24 can be electrically connected.
図９に示すように、制御手段（１０１）は、取得手段（１０２）の出力に基づいて電源手段（４１、４２）を制御する。画像形成装置１００Ａには、操作パネル１０２が取り付けられており、ユーザーが印刷する記録材Ｐの坪量を指定するようになっている。制御部１０１は、操作パネル１０２を通じてユーザーが指定した記録材Ｐの坪量によって、第１の転写モードと第２の転写モードとを切り替えて実行する。 As shown in FIG. 9, the control means (101) controls the power supply means (41, 42) based on the output of the acquisition means (102). An operation panel 102 is attached to the image forming apparatus 100A, and the user designates the basis weight of the recording material P to be printed. The control unit 101 executes switching between the first transfer mode and the second transfer mode according to the basis weight of the recording material P designated by the user through the operation panel 102.
そこで、実施例３では、図１０の（ｂ）に示すように、制御部１０１は、記録材Ｐの坪量が５２ｇ／ｍ２以上の場合、第２の転写モード（厚紙モード）を実行する。第２の転写モードでは、高圧電源４１、４２は、第１の加圧電極対（９、２１）を接地電位に接続するとともに第２の加圧電極対（１０、２３）に転写電圧を印加する。上流側の二次転写ローラ９が接地電位に落とされて、上流転写部Ｎ１の上流側で中間転写ベルト６と記録材Ｐとの間に大きな電界が形成されないように電界を規制している。高圧電源４２は、下流側の二次転写ローラ１０に＋３０〜＋４０μＡの電流を流して、中間転写ベルト６上のトナー像を記録材Ｐに転写させる。
Therefore, in Example 3, as shown in FIG. 10B, the control unit 101 executes the second transfer mode (thick paper mode) when the basis weight of the recording material P is 52 g / m 2 or more. In the second transfer mode, the high voltage power sources 41 and 42 connect the first pressure electrode pair (9, 21) to the ground potential and apply a transfer voltage to the second pressure electrode pair (10, 23). To do. The secondary transfer roller 9 on the upstream side is dropped to the ground potential, and the electric field is regulated so that a large electric field is not formed between the intermediate transfer belt 6 and the recording material P on the upstream side of the upstream transfer portion N1. The high voltage power source 42 causes a current of +30 to +40 μA to flow through the secondary transfer roller 10 on the downstream side to transfer the toner image on the intermediate transfer belt 6 to the recording material P.
Claims (7)
前記中間転写ベルトと前記転写ベルトとを介して互いに対向するように前記中間転写ベルトの内側と前記転写ベルトの内側にそれぞれ配置され、前記当接面の前記回転方向上流側部分で互いの間を加圧するとともに電界を印加可能な第１の加圧電極対と、
前記中間転写ベルトと前記転写ベルトとを介して互いに対向するように前記中間転写ベルトの内側と前記転写ベルトの内側にそれぞれ配置され、前記当接面の前記回転方向下流側部分で互いの間を加圧するとともに電界を印加可能な第２の加圧電極対と、を備え、
前記第１の加圧電極対に、前記中間転写ベルトから記録材へトナーが転写する方向の電界を印加するとともに、前記第２の加圧電極対のそれぞれを等電位にする転写モードを実行可能であることを特徴とする画像形成装置。 An image forming apparatus comprising an intermediate transfer belt for carrying a toner image and a transfer belt for carrying a recording material, wherein the intermediate transfer belt and the transfer belt form a contact surface along the rotation direction of the intermediate transfer belt Because
The intermediate transfer belt and the transfer belt are disposed on the inner side of the intermediate transfer belt and the inner side of the transfer belt so as to be opposed to each other, and the upstream portion of the contact surface in the rotation direction is between each other. A first pressure electrode pair capable of applying pressure and applying an electric field;
The intermediate transfer belt and the transfer belt are disposed on the inner side of the intermediate transfer belt and the inner side of the transfer belt so as to be opposed to each other, and the downstream portion of the contact surface in the rotation direction is between each other. A second pressure electrode pair capable of applying pressure and applying an electric field ;
A transfer mode in which an electric field in the direction in which toner is transferred from the intermediate transfer belt to the recording material is applied to the first pressure electrode pair and each of the second pressure electrode pairs is equipotential can be executed. An image forming apparatus.
前記転写モードは第１の転写モードであり、
前記第２の加圧電極対に、前記中間転写ベルトから記録材へトナーが転写する方向の電界を印加するとともに、前記第１の加圧電極対の電界をゼロにする第２の転写モードを実行可能であって、
前記取得手段の出力に基づいて、所定の判断基準よりも剛性が低い記録材に対しては前記第１の転写モードを実行し、前記所定の判断基準よりも剛性が高い記録材に対しては前記第２の転写モードを実行する制御手段と、を備えることを特徴とする請求項２に記載の画像形成装置。 It further comprises an acquisition means for acquiring information relating to the rigidity of the recording material,
The transfer mode is a first transfer mode,
A second transfer mode in which an electric field in a direction in which toner is transferred from the intermediate transfer belt to the recording material is applied to the second pressure electrode pair and the electric field of the first pressure electrode pair is zero. It is capable of executing,
Based on the output of the previous SL acquisition means, for a given for the recording material less rigid than the criterion executes the first transfer mode, the rigid than high predetermined criteria recording material the image forming apparatus according to claim 2, characterized in that Ru and a control means for performing the second transfer mode it is.
前記第２の加圧電極対は、前記転写ベルトの内側面を押圧して前記中間転写ベルトに当接させる第２の転写ローラと、前記中間転写ベルトの内側面を押圧して前記転写ベルトに当接させる第２の対向ローラと、から構成され、
前記転写ベルトの誘電率をεｂ（Ｆ／ｍ）とし、前記転写ベルトの体積抵抗率をρｂ（Ωｍ）とし、前記転写ベルトの回転速度をＶ（ｍｍ／ｓ）とし、前記転写ベルトの回転方向に沿った前記第１の転写ローラとの接触位置から前記第２の転写ローラとの接触位置までの距離をＬ（ｍｍ）とするとき、
εｂ × ρｂ ≦ Ｌ ／ Ｖ
であることを特徴とする請求項３に記載の画像形成装置。 The first pressure electrode pair includes a first transfer roller that presses an inner surface of the transfer belt to contact the intermediate transfer belt, and presses an inner surface of the intermediate transfer belt to the transfer belt. A first opposing roller to be contacted,
The second pressure electrode pair includes a second transfer roller that presses the inner surface of the transfer belt to contact the intermediate transfer belt, and presses the inner surface of the intermediate transfer belt to the transfer belt. A second opposing roller to be brought into contact with,
The dielectric constant of the transfer belt is εb (F / m), the volume resistivity of the transfer belt is ρb (Ωm), the rotation speed of the transfer belt is V (mm / s), and the rotation direction of the transfer belt When the distance from the contact position with the first transfer roller along the line to the contact position with the second transfer roller is L (mm),
εb × ρb ≤ L / V
The image forming apparatus according to claim 3 , wherein the image forming apparatus is an image forming apparatus.
εｐ × ρｐ ≦ Ｌ ／ Ｖ
であることを特徴とする請求項３又は４に記載の画像形成装置。 The dielectric constant of the recording material is εp (F / m), the volume resistivity of the recording material is ρp (Ωm), and the conveyance speed of the recording material is V (mm / s) , along the rotation direction of the transfer belt. When the distance from the contact position with the first transfer roller to the contact position with the second transfer roller is L (mm),
εp × ρp ≤ L / V
The image forming apparatus according to claim 3 , wherein the image forming apparatus is an image forming apparatus.
Ｖｇ × ３ ≦ Ｇ
であることを特徴とする請求項３乃至５いずれか１項に記載の画像形成装置。 The first transfer roller and the second transfer roller are disposed along the inner surface of the transfer belt, and the distance between the opposing surfaces of the first transfer roller and the second transfer roller is G (mm). When the maximum potential difference applied to the second pressure electrode pair in the second transfer mode is Vg (kV),
Vg x 3 ≤ G
The image forming apparatus according to claim 3 , wherein the image forming apparatus is an image forming apparatus.
前記中間転写ベルトと前記転写ベルトとを介して互いに対向するように前記中間転写ベルトの内側と前記転写ベルトの内側にそれぞれ配置され、前記当接面の前記回転方向上流側部分で互いの間を加圧するとともに電界を印加可能な第１の加圧電極対と、
前記中間転写ベルトと前記転写ベルトとを介して互いに対向するように前記中間転写ベルトの内側と前記転写ベルトの内側にそれぞれ配置され、前記当接面の前記回転方向下流側部分で互いの間を加圧するとともに電界を印加可能な第２の加圧電極対と、を備え、
前記第２の加圧電極対に、前記中間転写ベルトから記録材へトナーが転写する方向の電界を印加するとともに、前記第１の加圧電極対の電界をゼロにする転写モードを実行可能であることを特徴とする画像形成装置。 An image forming apparatus comprising an intermediate transfer belt for carrying a toner image and a transfer belt for carrying a recording material, wherein the intermediate transfer belt and the transfer belt form a contact surface along the rotation direction of the intermediate transfer belt Because
The intermediate transfer belt and the transfer belt are disposed on the inner side of the intermediate transfer belt and the inner side of the transfer belt so as to be opposed to each other, and the upstream portion of the contact surface in the rotation direction is between each other. A first pressure electrode pair capable of applying pressure and applying an electric field;
The intermediate transfer belt and the transfer belt are disposed on the inner side of the intermediate transfer belt and the inner side of the transfer belt so as to be opposed to each other, and the downstream portion of the contact surface in the rotation direction is between each other. A second pressure electrode pair capable of applying pressure and applying an electric field ;
A transfer mode in which an electric field in the direction in which toner is transferred from the intermediate transfer belt to the recording material is applied to the second pressure electrode pair and the electric field of the first pressure electrode pair is zero can be executed. An image forming apparatus, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009217644A JP5511280B2 (en) | 2009-09-18 | 2009-09-18 | Image forming apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2009217644A JP5511280B2 (en) | 2009-09-18 | 2009-09-18 | Image forming apparatus |
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| JP2011065081A JP2011065081A (en) | 2011-03-31 |
| JP2011065081A5 true JP2011065081A5 (en) | 2012-11-08 |
| JP5511280B2 JP5511280B2 (en) | 2014-06-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5727831B2 (en) * | 2011-03-28 | 2015-06-03 | 株式会社沖データ | Image forming apparatus |
| JP5884399B2 (en) * | 2011-10-19 | 2016-03-15 | ブラザー工業株式会社 | Image forming apparatus |
| JP6064499B2 (en) * | 2012-10-02 | 2017-01-25 | コニカミノルタ株式会社 | Image forming apparatus |
| JP6191488B2 (en) * | 2014-02-05 | 2017-09-06 | 富士ゼロックス株式会社 | Image forming apparatus |
| JP6422275B2 (en) * | 2014-09-03 | 2018-11-14 | キヤノン株式会社 | Image forming apparatus |
| JP6950213B2 (en) * | 2017-03-17 | 2021-10-13 | 富士フイルムビジネスイノベーション株式会社 | Transfer device and image forming device |
| JP7211091B2 (en) * | 2019-01-16 | 2023-01-24 | コニカミノルタ株式会社 | Intermediate transfer belt, manufacturing method thereof, and electrophotographic image forming apparatus provided with same |
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| JP2002108116A (en) * | 2000-09-29 | 2002-04-10 | Konica Corp | Image forming device |
| JP4088559B2 (en) * | 2002-06-03 | 2008-05-21 | 株式会社リコー | Image forming apparatus |
| JP2009025673A (en) * | 2007-07-20 | 2009-02-05 | Ricoh Co Ltd | Image forming apparatus |
| JP2009069475A (en) * | 2007-09-13 | 2009-04-02 | Seiko Epson Corp | Transfer device and image forming apparatus equipped with the same |
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