JPS5885466A - Copying device - Google Patents

Copying device

Info

Publication number
JPS5885466A
JPS5885466A JP18345781A JP18345781A JPS5885466A JP S5885466 A JPS5885466 A JP S5885466A JP 18345781 A JP18345781 A JP 18345781A JP 18345781 A JP18345781 A JP 18345781A JP S5885466 A JPS5885466 A JP S5885466A
Authority
JP
Japan
Prior art keywords
intermediate transfer
roller
transfer
transfer belt
belt
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
Application number
JP18345781A
Other languages
Japanese (ja)
Inventor
Tadashi Miwa
正 三輪
Kiyoshi Kimura
清 木村
Koji Komiya
小宮　幸治
Noriyoshi Tarumi
紀慶 樽見
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP18345781A priority Critical patent/JPS5885466A/en
Priority to US06/441,795 priority patent/US4455079A/en
Priority to DE19823242231 priority patent/DE3242231A1/en
Publication of JPS5885466A publication Critical patent/JPS5885466A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2064—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat combined with pressure
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1676—Simultaneous toner image transfer and fixing
    • G03G2215/1695—Simultaneous toner image transfer and fixing at the second or higher order transfer point

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)

Abstract

PURPOSE:To improve the transfer efficiency and enhance the transfer and fixing speed, by providing a carrying guide besides an auxiliary press roller to increase the area of the contact between a supporting roller and an intermediate transfer belt as well as a transfer paper. CONSTITUTION:A toner image on an intermediate transfer belt 8 is carried to a transfer and fixing part by a press roller 5 for transfer while being heated properly according as the belt 8 is turned, and heat is flowed to a supporting roller 13 and an auxiliary press roller 14 from a transfer paper P, the intermediate transfer belt 8, and a toner during the toner image passes between the supporting roller 13 and the auxiliary press roller 14 while being brought into contact with the intermediate transfer belt 8. Since the intermediate transfer belt 8 and the transfer paper P are separated after temperatures of the transfer paper P, the intermediate transfer belt, and the toner are lowered sufficiently, the viscosity of the toner is sufficiently high or the toner is solidified when they are separated, and thus, the occurrence of the offset of remaining and sticking of the fused toner on the intermediate transfer belt 8 is prevented.

Description

【発明の詳細な説明】 本発明は、電荷保持体上に形成されたトナー像をベルト
状中間転写体を介して抑圧と熱により転写材に転写定着
せしめる方式の複写装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a copying apparatus in which a toner image formed on a charge carrier is transferred and fixed onto a transfer material through a belt-like intermediate transfer member by compression and heat.

複写装置例えば電子写真複写装置による画像形成プロセ
スは、絶縁性光導電体を感光体として用いた電荷保持体
上に、コロナ帯電と光照射によって原稿の画像に対応す
る静電潜像を形成させ、これをトナー現像剤にて現像す
ることにより可視像を形成せしめる。The image forming process using a copying device, such as an electrophotographic copying device, involves forming an electrostatic latent image corresponding to the image of an original on a charge holding body using an insulating photoconductor as a photoreceptor by corona charging and light irradiation. A visible image is formed by developing this with a toner developer.

この電荷保持体上の可視像すなわちトナー像はコロナ放
電か、バイアスローラなどによる電気的な転写法、ある
いは抑圧または加熱などの物理的な手段圧より、転写材
などの上に転写される。そして上記により転写材上に転
写されたトナー像は通常の加熱手段により転写材上に定
着されて画像形成プロセスは完了する。The visible image, that is, the toner image on the charge carrier is transferred onto a transfer material or the like by corona discharge, an electric transfer method using a bias roller, or pressure by physical means such as compression or heating. Then, the toner image transferred onto the transfer material as described above is fixed onto the transfer material by ordinary heating means, and the image forming process is completed.

上記画像形成プロセスにおいて述べた通り、電荷保持体
上に形成されたトナー像を転写材上に転写させる方法と
しては、コロナ放電による転写法またはバイアスローラ
転写法等の電気的方法があるが、この方法は特に温度ま
たは湿度などの雰囲気において転写率が影響され、かつ
転写画像の乱れが発生するなど問題点が多いので、電気
的手段に頼らない他の方法も検討されており、その一手
段として押圧による転写法が知られている。例えば特公
昭４６−４１６７９号および特開昭４９−７８５５９号
公報などの記載によれば、感光体上のトナー像を弾性的
で耐熱性の中間ブランケット中に色塑せしめ、感光体上
のトナー像を残留させることなく転写させることによっ
て、良好な画質の像転写を行わしめる方法と装置が開示
されている。As mentioned in the image forming process above, there are electrical methods such as corona discharge transfer method or bias roller transfer method to transfer the toner image formed on the charge carrier onto the transfer material. This method has many problems, such as the transfer rate being affected by the atmosphere such as temperature or humidity, and disturbances in the transferred image, so other methods that do not rely on electrical means are being considered, and one of them is A transfer method using pressure is known. For example, according to the descriptions in Japanese Patent Publication No. 46-41679 and Japanese Patent Application Laid-open No. 49-78559, the toner image on the photoreceptor is colored in an elastic and heat-resistant intermediate blanket, and the toner image on the photoreceptor is A method and apparatus are disclosed for transferring images of good image quality by transferring images without leaving any residue.

しかしながら、昨今の如く高速複写が要求される時代に
おいては、更に定着効率を高め定着速度を速めることも
必要とされ、中間転写体を用いた抑圧と加熱によるトナ
ー像の転写、定着方式の複写装置に関しても特に定着速
度の向上を意図する各種手段による試みがなされている
。例えば前記抑圧と加熱によりトナー像の転写定着を行
な５方式の複写装置としてベルト状の中間転写体を用い
た装置も知られているが、このような複写装置において
定着速度を高めるために定着装置の加熱温度を上げると
ともにトナー像の転写材への転写効率をも高める必要が
あり、特に上記目的のために定着装置の加熱温度を高め
ると繰返し複写に際してベルト状中間転写体（以下単罠
中間転写ベルトと呼ぶ）が加熱され、加熱されたままの
該中間転写ベルトが電荷保持体と圧接することによって
電荷保持体を加熱せしめ感光体としての特性を劣化させ
るという欠点を有している。However, in today's era where high-speed copying is required, it is also necessary to further improve fixing efficiency and increase fixing speed. Various attempts have also been made to improve the fixing speed. For example, a device using a belt-shaped intermediate transfer member is known as a five-method copying device that transfers and fixes toner images by the above-mentioned compression and heating. In addition to increasing the heating temperature of the device, it is also necessary to increase the transfer efficiency of the toner image to the transfer material.In particular, if the heating temperature of the fixing device is increased for the above purpose, the belt-shaped intermediate transfer body (hereinafter referred to as single trap intermediate The intermediate transfer belt (referred to as a transfer belt) is heated, and the heated intermediate transfer belt comes into pressure contact with the charge carrier, thereby heating the charge carrier and deteriorating its characteristics as a photoreceptor.

そこで本発明の目的は、転写材へのトナー像の転写効率
が優れ、同時に転写定着速度が速く、かつ感光体に対す
る熱的影響が改良された中間転写ベルトを用いた複写装
置を提供することにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a copying apparatus using an intermediate transfer belt that has excellent transfer efficiency of toner images onto a transfer material, has a high transfer and fixing speed, and has improved thermal effects on photoreceptors. be.

本発明者等は種々検討を重ねた結果、中間転写ベルトの
内側に設けて、中間転写ベルトを支持するとともに該中
間転写ベルト上のトナー像を加熱し溶融せしめる支持ロ
ーラの温度を従来のように高温とせずトナーの溶融温度
より少し低い温度に設定し中間転写ベルトへの熱移動量
を減じ、さらに該支持ローラの転写定着部を経た表面部
と前記中間転写ベルトを補助圧接ローラを用いて接触面
積を大きくとるように構成するとともに転写定着部から
排出した転写紙を中間転写ベルトと密着させたまま補助
圧接ローラと支持ローラとの間に導入せしめるように構
成する　′ 　５− ことによって転写紙へのトナー像の転写効率を高めると
同時に中間転写ベルト及び排出された転写紙の熱を前記
支持ローラに逃がしてやることができる。さらに前記補
助圧接ローラを熱を吸収する部材等でなすことにより、
中間転写ベルト及び排出された転写紙の熱を補助圧接ロ
ーラへ逃がしてやることもでき、更に良い結果を得た。As a result of various studies, the inventors of the present invention have determined that the temperature of the support roller, which is provided inside the intermediate transfer belt to support the intermediate transfer belt and heat and melt the toner image on the intermediate transfer belt, has been changed as in the past. The temperature is not set at a high temperature but slightly lower than the melting temperature of the toner to reduce the amount of heat transferred to the intermediate transfer belt, and furthermore, the surface portion of the support roller that has passed through the transfer fixing section and the intermediate transfer belt are brought into contact using an auxiliary pressure roller. It is configured to have a large area and is configured to introduce the transfer paper discharged from the transfer fixing section between the auxiliary pressure roller and the support roller while keeping it in close contact with the intermediate transfer belt. It is possible to improve the transfer efficiency of the toner image and at the same time to release the heat of the intermediate transfer belt and the ejected transfer paper to the support roller. Furthermore, by forming the auxiliary pressure roller with a heat absorbing member or the like,
Even better results were obtained by allowing the heat of the intermediate transfer belt and the ejected transfer paper to escape to the auxiliary pressure roller.

すなわち、前記の目的は、電荷保持体上に形成されたト
ナー像を中間転写ベルトを用いて抑圧および熱により転
写材に転写定着せしめる複写装置において、該中間転写
ベルトの内側に位置し、該中間転写ベルトを介して圧接
ローラと対向し、転写定着部を構成する支持ローラに、
該中間転写ベルトを介して接し、且つ転写定着部の下流
側に補助圧接ローラを設げ、支持ローラとベルトおよび
転写紙との接触面積を大きくするとともに転写定着部か
ら排出された転写紙を前記中間転写ベルトと密着せしめ
たまま前記補助圧接ローラと支持ローラとの間に導入せ
しめるように構成した複写装置により達成し得ることを
見出した。That is, the above object is to provide a copying apparatus that uses an intermediate transfer belt to transfer and fix a toner image formed on a charge carrier onto a transfer material by suppressing and heating the intermediate transfer belt. A support roller that faces the pressure roller through the transfer belt and constitutes the transfer and fixing section,
An auxiliary pressure roller is provided in contact with the intermediate transfer belt and on the downstream side of the transfer fixing section to increase the contact area between the support roller, the belt, and the transfer paper, and to transfer the transfer paper discharged from the transfer fixing section to the It has been found that this can be achieved by a copying device configured to be introduced between the auxiliary pressure roller and the support roller while being in close contact with the intermediate transfer belt.

　６− 以下、本発明の複写装置をその実施態様と合わせて図面
の実施例に基き具体的に説明する。6- Hereinafter, the copying apparatus of the present invention will be specifically explained based on the embodiments of the drawings together with its embodiments.

第１図は従来の複写装置の一例を示す概観図である。図
中１は矢印方向に回転し得るドラム状の電荷保持体で、
その外周辺に沿って回転方向に対して頭圧静電荷像形成
部２、現像装置３、転写用押圧ローラ５、クリーニング
装置６および除電装置７が配設されている。そして４は
電荷保持体１上に形成されたトナー像である。上記静電
荷像形成部２は、電荷保持体１が光導電性感光体よりな
る場合には帯電器および露光用光学系により構成され、
電荷保持体１が誘電体よりなる場合ｆは針電極あるいは
イオン流変調電極等により構成される。FIG. 1 is an overview diagram showing an example of a conventional copying apparatus. In the figure, 1 is a drum-shaped charge carrier that can rotate in the direction of the arrow.
A head pressure electrostatic charge image forming section 2, a developing device 3, a transfer pressure roller 5, a cleaning device 6, and a static eliminator 7 are arranged along the outer periphery in the rotational direction. 4 is a toner image formed on the charge carrier 1; The electrostatic image forming section 2 is constituted by a charger and an exposure optical system when the charge carrier 1 is made of a photoconductive photoreceptor,
When the charge carrier 1 is made of a dielectric material, f is composed of a needle electrode, an ion flow modulating electrode, or the like.

上記静電荷像形成部２により形成された静電荷像は、現
像装置３により現像されてトナー像４となり、電荷保持
体１の回転に伴い転写部位Ｔに到る・８は前記転写用抑
圧ローラ５等に掛けまわされている中間転写ベルトで、
シリコン系ゴム或いはテフロン系ゴムなどの耐熱性の弾
性体から成る転写層と、耐熱性の基体例えばステンレス
鋼板、ポリイミド、ポリイミドアミド、ポリアミド、ポ
リエステル、ポリ系レート等の樹脂を材質とする耐熱性
フィルム（例えば「Ｕシート」太平化学社製）などの耐
熱性の高分子フィルムとの積層体により形成されるもの
であり、転写層の材質は、室温加硫型若しくは低温加硫
型のシリコン系ゴムが特に好ましい。例えば「ＬＴＶ１
８００Ｊ、ｌ’−ＬＴＶ１３００Ｊ　　（何れも信越化
学工業社製）は、付加重合型のシリコンゴムであり、転
写層の材質として特に好ましい材料である。The electrostatic charge image formed by the electrostatic charge image forming section 2 is developed by the developing device 3 to become a toner image 4, which reaches the transfer site T as the charge holding body 1 rotates. 8 is the transfer suppression roller. The intermediate transfer belt that is wrapped around the 5th grade,
A transfer layer made of a heat-resistant elastic material such as silicone rubber or Teflon-based rubber, and a heat-resistant substrate such as a heat-resistant film made of a resin such as a stainless steel plate, polyimide, polyimide amide, polyamide, polyester, or polyester. (For example, "U sheet" manufactured by Taihei Kagaku Co., Ltd.) is formed by a laminate with a heat-resistant polymer film, and the material of the transfer layer is room-temperature vulcanization type or low-temperature vulcanization type silicone rubber. is particularly preferred. For example, “LTV1
800J and l'-LTV1300J (both manufactured by Shin-Etsu Chemical Co., Ltd.) are addition polymerization type silicone rubbers, and are particularly preferable materials for the transfer layer.

電荷保持体１０回動て伴ない転写部位Ｔに運ばれたトナ
ー像４は転写用押圧ローラ５の押圧作用によって上記中
間転写ベルト８の弾性体からなる転写層に転写される。The toner image 4 carried to the transfer site T by the rotation of the charge holding member 10 is transferred to the transfer layer made of an elastic material of the intermediate transfer belt 8 by the pressing action of the transfer pressure roller 5.

９は熱源を内蔵する加熱ローラ（支持ローラ）で、１０
は上記ベルト状中間転写ベルト８を介して加熱ローラ９
と圧接する圧接ローラであって、１１は図示されない駆
動源によって駆動される搬送ローラであって、中間転写
ベルト８は転写用押圧ローラ５、加熱ローラ９および搬
送ローラ１１により張架されて回動自在になされている
。9 is a heating roller (support roller) with a built-in heat source;
is transferred to the heating roller 9 via the belt-like intermediate transfer belt 8.
11 is a conveyance roller driven by a drive source (not shown), and the intermediate transfer belt 8 is stretched by the transfer pressure roller 5, the heating roller 9, and the conveyance roller 11 and rotates. It is done freely.

１２は転写紙の加熱装置であり、必要に応じて設げるこ
とができる。また圧接ローラ１０も必要に応じて熱源を
内蔵する加熱ローラとして用いてもよ（＼。Reference numeral 12 denotes a heating device for the transfer paper, which can be provided as necessary. Further, the pressure roller 10 may also be used as a heating roller with a built-in heat source, if necessary.

従って前述の中間転写ベルト８上に転写されたトナー像
は、ベルトの回動に伴ない加熱ローラ９によって加熱さ
れつつ転写定着部に移動し、加熱ローラ９と圧接ローラ
１０とにより給紙装置（図示なし）から搬送された転写
紙Ｐ（必要に応じて紙加熱装置１２により十分に加熱さ
れていることが好ましい）に圧接されて転写紙Ｐ上に転
写定着される。Therefore, the toner image transferred onto the intermediate transfer belt 8 described above is heated by the heating roller 9 as the belt rotates and moves to the transfer fixing section, and is transferred to the paper feeding device ( The image is transferred and fixed onto the transfer paper P (preferably sufficiently heated by a paper heating device 12 if necessary), which is conveyed from the transfer paper P (not shown).

上記従来の装置によれば、中間転写ベルト８上のトナー
像は、はぼ完全に転写紙Ｐに融着定着されるが、定着作
動後の中間転写ベルト８はかなり高温となり、十分に冷
却されずに熱を保有したままで電荷保持体１と圧接して
しまう。そこで電荷保持体１がこれにより熱的影響を受
けて、その結９− 来電荷保持体１の特性が劣化又は変化し、画質の良い複
写画像が安定して得られなくなるという問題点を有して
いた。According to the above-mentioned conventional device, the toner image on the intermediate transfer belt 8 is almost completely fused and fixed on the transfer paper P, but the intermediate transfer belt 8 becomes quite hot after the fixing operation and is not sufficiently cooled. Instead, it comes into pressure contact with the charge carrier 1 while retaining heat. Therefore, the charge carrier 1 is thermally affected by this, and as a result, the characteristics of the charge carrier 1 deteriorate or change, resulting in a problem that a copy image of good quality cannot be stably obtained. was.

第２図は本発明の複写装置の概観図である。FIG. 2 is a schematic diagram of the copying apparatus of the present invention.

図中１３は中間転写ベルト８と接触し転写定着部を構成
する支持ローラであり、１４は上記ベルトの外側に位置
し、支持ローラ１３と圧接する位置に配設された補助圧
接ローラである。また１５は転写定着部を排出した転写
紙Ｐを上記中間転写ベルト８と接した状態のまま搬送さ
せるための搬送ガイドである。In the drawing, reference numeral 13 denotes a support roller that comes into contact with the intermediate transfer belt 8 and constitutes a transfer fixing section, and reference numeral 14 denotes an auxiliary pressure roller disposed outside the belt and in pressure contact with the support roller 13. Reference numeral 15 denotes a conveyance guide for conveying the transfer paper P discharged from the transfer fixing section while remaining in contact with the intermediate transfer belt 8.

本発明においては上記のように補助圧接ローラ１４と共
に搬送ガイド１５をも設けたので、支持ローラ１３に対
する中間転写ベルト８と転写紙Ｐとの接触面積を大きく
した点に構成上の特徴を有するものである。In the present invention, since the conveyance guide 15 is also provided together with the auxiliary pressure roller 14 as described above, the structure is characterized in that the contact area between the intermediate transfer belt 8 and the transfer paper P with respect to the support roller 13 is increased. It is.

本発明を上記の第２図の実施例により説明する。The present invention will be explained with reference to the embodiment shown in FIG. 2 above.

転写用押圧ローラ５の押圧作用により中間転写ベルト８
に転写したトナー像は、該ベルトの回動に伴ない転写定
着部に適度に加熱されながら運ばれ１／’ｌ　　＋＋ て、紙加熱装置１２または圧接ローラ１０によりトナー
溶融温度以上に加熱された転写紙Ｐと重ね合わさり、十
分に熱を受けると同時に支持ローラ１３と圧接ローラｌ
Ｏとによる押圧作用を受は転写紙Ｐ上に転写定着される
。この時の支持ローラ１３の温度はトナー溶融温度より
も低い温度に設定しである。The intermediate transfer belt 8 is moved by the pressing action of the transfer pressure roller 5.
As the belt rotates, the toner image transferred to the toner image is transported to the transfer fixing section while being moderately heated, and is heated to a temperature higher than the toner melting temperature by the paper heating device 12 or the pressure roller 10. It is overlapped with the transfer paper P and receives sufficient heat, and at the same time the support roller 13 and the pressure roller l
The image is transferred and fixed onto the transfer paper P by the pressing action of O. At this time, the temperature of the support roller 13 is set to be lower than the toner melting temperature.

本実施例では支持ローラ１３と圧接ローラ１０とで形成
される転写定着部を通過するときの中間転写ベルト８及
びトナー及び転写紙Ｐの温度は従来装置と同様であるに
もかかわらず、トナー像を担持した転写紙Ｐは、搬送ガ
イド１５により前記ベルトと共に搬送され支持ローラ１
３と補助圧接ローラ１４の間を中間転写ベルト８と密着
して通過する間、転写紙Ｐと中間転写ベルト８及びトナ
ーから支持ローラ１３及び補助圧接ローラ１４に熱が流
入し、前記転写紙Ｐと中間転写ベルト及びトナーの温度
を充分に低下せしめてから中間転写ベルト８と転写紙Ｐ
とが分離せしめられるため、前記分離時のトナーの粘度
を充分に太ぎく又はトナーを固体状態にすることができ
、中間転写ベルト８に溶融トナーが残留付着するオフセ
ット現象の発生が防止された転写定着が行われるという
効果を本発明は有するものである。また、支持ローラ１
３に対する上記中間転写ベルトと転写紙による接触面積
を大きくしたので、転写紙へのトナー像の転写効率を向
上させることができた。In this embodiment, although the temperature of the intermediate transfer belt 8, toner, and transfer paper P when passing through the transfer fixing section formed by the support roller 13 and the pressure roller 10 is the same as that of the conventional device, the toner image The transfer paper P carrying a
While the transfer paper P passes in close contact with the intermediate transfer belt 8 between the transfer paper P 3 and the auxiliary pressure roller 14, heat flows from the transfer paper P, the intermediate transfer belt 8, and the toner into the support roller 13 and the auxiliary pressure roller 14, and the transfer paper P After sufficiently lowering the temperature of the intermediate transfer belt 8 and the toner, the intermediate transfer belt 8 and the transfer paper P are removed.
Since the toner is separated, the viscosity of the toner at the time of separation can be made sufficiently thick or the toner can be made into a solid state, and the occurrence of an offset phenomenon in which molten toner remains and adheres to the intermediate transfer belt 8 can be prevented. The present invention has the effect that fixing is performed. In addition, support roller 1
Since the contact area between the intermediate transfer belt and the transfer paper was increased compared to No. 3, the efficiency of transferring the toner image to the transfer paper could be improved.

また本発明においては、転写定着部で最高に加熱された
中間転写ベルト８は転写定着部を過ぎると、より低い温
度に設定された支持ローラ１３と圧接状態で回動される
ので支持ローラ１３に熱を奪われ徐々に熱を失ないなが
ら補助圧接ローラ１４との圧接点に至る。Furthermore, in the present invention, after passing the transfer and fixing section, the intermediate transfer belt 8 heated to the maximum temperature in the transfer and fixing section is rotated in pressure contact with the support roller 13, which is set at a lower temperature. The heat is removed and the heat is gradually lost until reaching the pressure contact point with the auxiliary pressure roller 14.

そして、これも上記同様にトナー溶融温度より低い温度
に設定された補助圧接ローラ１４との圧接により更に熱
を奪われ急速に温度を低下させるので、該中間転写ベル
ト８が再び電荷保持体１と圧接する位置に到達した時に
は最早電荷保持体１の特性を劣化せしめる如き熱影響を
与えることができない程度にまで中間転写ベルトの温度
が降下している。従って本発明によれば中間転写ベルト
による電荷保持体への熱的影響を防止することが可能に
なるので常に良質の複写画像を得ることができる０ 第３図は従来の装置と本発明の装置における上記の中間
転写ベルト及び転写紙の熱変動を比較して図示したもの
である。ここでは転写定着時における転写紙あるいはベ
ルト表面温度が従来装置および本発明装置でそれぞれ同
一温度と仮定している。図中、ＴＢとＴ　Ｂ／はそれぞ
れ本発明と従来装置における中間転写ベルトの表面温度
、またＴｐは同様に本発明における転写紙の表面温度を
示している。そしてＴ８Ｔはトナーの溶融温度、さらに
凧は支持ローラと圧接ローラによるニップ幅、異はこの
ベルトが圧接ローラによって圧接され始めてから支持ロ
ーラから離れるまでの距離である。Similarly to the above, the intermediate transfer belt 8 is brought into pressure contact with the auxiliary pressure roller 14, which is set at a temperature lower than the toner melting temperature, and further heat is removed, causing the temperature to drop rapidly. By the time the intermediate transfer belt reaches the pressure contact position, the temperature of the intermediate transfer belt has dropped to such an extent that it can no longer exert any thermal influence that would degrade the characteristics of the charge carrier 1. Therefore, according to the present invention, it is possible to prevent the thermal influence of the intermediate transfer belt on the charge carrier, so that it is possible to always obtain high-quality copied images. Fig. 3 shows the conventional apparatus and the apparatus of the present invention. 2 is a diagram comparing and illustrating thermal fluctuations of the intermediate transfer belt and transfer paper in FIG. Here, it is assumed that the surface temperature of the transfer paper or belt during transfer and fixing is the same in both the conventional apparatus and the apparatus of the present invention. In the figure, TB and TB/ respectively indicate the surface temperature of the intermediate transfer belt in the present invention and the conventional apparatus, and Tp similarly indicates the surface temperature of the transfer paper in the present invention. T8T is the melting temperature of the toner, and T8T is the nip width between the support roller and the pressure roller, and the difference is the distance from when the belt starts being pressed by the pressure roller until it separates from the support roller.

図によると、転写紙Ｐが紙加熱装置または圧接ローラに
よりトナー溶融温度以上に加熱され、中間転写ベルトと
転写定着部で圧接されると転写紙Ｐにより中間転写ベル
ト及びトナーが定着適正温度に加熱されて、トナー像の
転写定着が行われた１３− 後、転写紙Ｐは中間転写ベルト８と重ね合わされたまま
、尚支持ロール１３と圧接しながら移動する。According to the figure, when the transfer paper P is heated to a temperature higher than the toner melting temperature by a paper heating device or a pressure roller and is pressed against the intermediate transfer belt and the transfer fixing section, the transfer paper P heats the intermediate transfer belt and the toner to the appropriate fixing temperature. After the toner image is transferred and fixed (13-), the transfer paper P moves while being overlapped with the intermediate transfer belt 8 and in pressure contact with the support roll 13.

そしてこの圧接期間中に比較的低温に設定された本発明
による支持ローラ１３に中間転写ベルト８からの熱の移
動が起り、中間転写ベルト８は効果的に熱を失なってゆ
＜（ＴＢ温度）。従って中間転写ベルト８が支持ローラ
１３と離れる頃には、中間転写ベルト８の温度は本発明
圧おいては、従来装置での中間転写体の温度ＴＢ′（二
点鎖線で示す）と比較してＴ、−Ｔ、で示されるように
著しく温度を低下させることができる。ここで、温度Ｔ
１　、’ｒ、は、中間転写ベルトが圧接ローラと離れる
ニップ幅凧を経た地点での中間転写ベルトの表面温度弯
との、それぞれ中間転写ベルトが支持ローラを離れるＷ
□点での本発明での転写紙（中間転写ベルトと同温）の
温度との差であり、従来例での中間転写ベルトの温度と
の差である。During this pressing period, heat transfer from the intermediate transfer belt 8 occurs to the support roller 13 according to the present invention, which is set at a relatively low temperature, and the intermediate transfer belt 8 effectively loses heat. ). Therefore, by the time the intermediate transfer belt 8 separates from the support roller 13, the temperature of the intermediate transfer belt 8 at the pressure of the present invention is compared to the temperature TB' (indicated by the two-dot chain line) of the intermediate transfer body in the conventional apparatus. The temperature can be significantly lowered as shown by T and -T. Here, temperature T
1, 'r, is the surface temperature curve of the intermediate transfer belt at the point after passing the nip width kite where the intermediate transfer belt leaves the pressure roller, and W where the intermediate transfer belt leaves the support roller, respectively.
This is the difference from the temperature of the transfer paper (same temperature as the intermediate transfer belt) in the present invention at point □, and the difference from the temperature of the intermediate transfer belt in the conventional example.

一方、転写紙も第３図のＴｒのカーブが示す如く、上記
により重ね合わされた中間転写ベルトの温度低下に伴っ
て急速に熱を失ない、転写定着し１４− たトナー像の温度もこれに伴って低下し、トナ一層も固
体状態及び高粘度状態に変化し、強固な層に変化してか
ら補助圧接ローラとの圧接点を過ぎたところで転写紙は
上記ベルトを剥離し、分離される。On the other hand, as shown by the Tr curve in Figure 3, the transfer paper does not rapidly lose heat as the temperature of the overlapping intermediate transfer belt decreases, and the temperature of the transferred and fixed toner image also decreases. Along with this, the toner layer also changes to a solid state and a high viscosity state, and after changing to a strong layer, when it passes the point of pressure contact with the auxiliary pressure roller, the transfer paper peels off the belt and is separated.

第２図に示した実施例でのトナー溶融温度、支持ローラ
、圧接ローラ及び転写直前の転写紙の温度はそれぞれ１
３０℃、９０’Ｃ、２００℃、１４０℃程度であった。In the embodiment shown in FIG. 2, the toner melting temperature, the support roller, the pressure roller, and the transfer paper temperature immediately before transfer are each 1
The temperatures were approximately 30°C, 90'C, 200°C, and 140°C.

これはほんの−例であり、本発明としての効果は所要の
構成であれば異なる温度もとり得る。This is just an example, and the effects of the present invention can be achieved at different temperatures depending on the required configuration.

第４図は本発明の複写装置の他の実施例を示すものであ
る。この実施例では第２図の補助圧接ローラ１４として
、より効果的に本発明の目的を果すため熱の伝達効率の
優れたヒートツクイブローラ１６を使用した装置が示さ
れている。ヒートツクイブローラ１６として既存の熱の
伝達効率のよいものであれば、如何なるものでも使用す
ることができ、本実施例ではヒートパイプを補助圧接ロ
ーラそのものとして回転可能に設けたが、そうでなくヒ
ートパイプローラは固設し、該ヒートパイプローラと熱
的に密接に関係した回転可能になしたローラを補助圧接
ローラとすることもできる。FIG. 4 shows another embodiment of the copying apparatus of the present invention. In this embodiment, an apparatus is shown in which a heat swivel roller 16 with excellent heat transfer efficiency is used as the auxiliary pressure roller 14 in FIG. 2 in order to more effectively achieve the object of the present invention. Any existing heat transfer roller 16 can be used as long as it has good heat transfer efficiency.In this embodiment, the heat pipe was rotatably provided as the auxiliary pressure roller itself, but instead of the heat The pipe roller may be fixedly installed, and a rotatable roller that is thermally closely related to the heat pipe roller may be used as the auxiliary pressure roller.

例えば熱伝導性の優れているアルミニウムからなるヒー
トパイプローラが一般的に用いられる。For example, a heat pipe roller made of aluminum, which has excellent thermal conductivity, is generally used.

勿論、ヒートパイプローラ１４０片端は転写定着部と距
離をへだてだ低温空間に設けられた冷却フィンと一体化
されている。従って補助圧接ローラは低温に保たれるた
め支持ローラ、中間転写ベルト補助圧接ローラ内での温
度勾配は支持ローラから補助圧接ローラに向って熱が流
れるようになっている。Of course, one end of the heat pipe roller 140 is integrated with a cooling fin provided in a low-temperature space separated from the transfer and fixing section. Therefore, since the auxiliary pressure roller is kept at a low temperature, the temperature gradient within the support roller and the intermediate transfer belt auxiliary pressure roller is such that heat flows from the support roller toward the auxiliary pressure roller.

第５図は本発明の更に他の実施例を示すものである。こ
の実施例も前回と同様に補助圧接ローラ１４として熱の
吸収効率の高いローラとして、熱伝導率が大きく、熱容
量の大きいローラー例えば鉄製のローラ１７を配設せし
めた装置に関するものである。FIG. 5 shows still another embodiment of the present invention. Similar to the previous example, this embodiment also relates to a device in which a roller 17 made of iron and having high thermal conductivity and large heat capacity, for example, is provided as the auxiliary pressure roller 14 as a roller with high heat absorption efficiency.

また更に他の実施例として第６図に示すように補助圧接
ローラを１個だけでなく複数個用いて、でき得る限り支
持ローラに対する中間転写ベルトの接触条件を良くする
ことは本発明にとって望ましい。In yet another embodiment, as shown in FIG. 6, it is desirable for the present invention to use not only one but a plurality of auxiliary pressure rollers to improve the contact conditions of the intermediate transfer belt with the support roller as much as possible.

本発明の複写装置は以上詳細に説明した通り、補助圧接
ローラを設けることにより支持ローラとベルト状中間転
写体との接触面積を大きくなし得たので、支持ローラの
温度をトナー溶融温度以下に設定することにより上記ベ
ルトの熱を支持ローラに吸収させることができた。また
更に上記補助圧接ローラとして熱伝導性に優れたローラ
、あるいは熱容量の大きなローラを使用することにより
ベルトの熱を補助圧接ローラに逃がしてやることが可能
となり必然的に加熱許容度を広めることもできるので定
着速度を高速化し、かつベルトによる熱影響を電荷保持
体に与えることのない複写装置を得ることが容易にされ
た。As explained in detail above, the copying apparatus of the present invention can increase the contact area between the support roller and the belt-like intermediate transfer member by providing the auxiliary pressure roller, so the temperature of the support roller is set to below the toner melting temperature. By doing so, the heat of the belt could be absorbed by the support roller. Furthermore, by using a roller with excellent thermal conductivity or a roller with a large heat capacity as the auxiliary pressure roller, it becomes possible to release the heat from the belt to the auxiliary pressure roller, which naturally expands the heating tolerance. Therefore, it has become easy to obtain a copying apparatus in which the fixing speed can be increased and the charge carrier is not affected by heat due to the belt.

上記実施例を説明した図面では電荷保持体への中間転写
ベルトの圧接を行う転写用押圧ローラと中間転写ベルト
駆動用の搬送ローラを個別に示したが、この２本のロー
ラを一本で兼用しても差支１７− えない。支持または圧接ローラにベルトな回動せしめる
駆動源が備わっていて他のローラが従動するタイプでも
よい。ただし電荷保持体と同期してなければいけない。In the drawings explaining the above embodiment, the transfer pressure roller that presses the intermediate transfer belt against the charge carrier and the conveyance roller that drives the intermediate transfer belt are shown separately, but these two rollers can be used as one roller. Even if I do, I can't make a difference. It may also be of a type in which the support or pressure roller is provided with a drive source for rotating the belt and other rollers are driven. However, it must be synchronized with the charge carrier.

また本発明による複写装置は％　ニリテンシぢンプロセ
スＶこも好ましく適用することができる。Further, the copying apparatus according to the present invention can also be preferably applied to the % niri-tension process.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の中間転写ベルトを用いたタイプの複写装
置の概観図の一例、第２図は本発明の複写装置の概観図
の一例、第３図は本発明と従来装置に′：４６げる中間
転写ベルト表面温度の比較図、第４図乃至第６図は本発
明の他の実施例としての装置の概観図である。 １・・・電荷保持体　　　　４・・・トナー像５・・・
転写用抑圧ローラ　８・・・中間転写べ）＆トル・・・
圧接ローラ　　　　１２・・・紙加熱装置１３・・・支
持ローラ １４および１４　Ａ・・・補助圧接ローラ１５・・・搬
送ガイド　　　　］６・・・ヒートパイプローラ１７・
・・熱容量の大きいローラ 　１８− 第１図 堵４−閃 第５閉 第６閉Fig. 1 is an example of an overview of a type of copying apparatus using a conventional intermediate transfer belt, Fig. 2 is an example of an overview of a copying apparatus of the present invention, and Fig. 3 is an example of an overview of a copying apparatus of a type using a conventional intermediate transfer belt. 4 to 6 are general views of apparatuses as other embodiments of the present invention. 1... Charge holding body 4... Toner image 5...
Transfer suppression roller 8...Intermediate transfer roller...
Pressure roller 12... Paper heating device 13... Support rollers 14 and 14 A... Auxiliary pressure roller 15... Conveyance guide] 6... Heat pipe roller 17.
・・Roller with large heat capacity 18- Figure 1 4- Flash 5th close 6th close

Claims (5)

【特許請求の範囲】[Claims] （１）　　電荷保持体上に形成されたトナー像を中間転
写ベルトを用いて抑圧および熱により転写材に転写定着
せしめる複写装置において、該中間転写ベルトの内側に
位置し、該中間転写ベルトを介して圧接ローラと対向し
転写定着部を構成する支持ローラに、該中間転写ベルト
を介して接し、且つ転写定着部の下流側に補助圧接ロー
ラを設け、支持ローラとベルトおよび転写紙との接触面
積を大きくするとともに転写定着部から排出された転写
紙を前記中間転写ベルトと密着せしめたまま前記補助圧
接ローラと支持ローラとの間に導入せしめるように構成
したことを特徴とする複写装置。(1) In a copying device that uses an intermediate transfer belt to transfer and fix a toner image formed on a charge carrier onto a transfer material using heat, a toner image that is located inside the intermediate transfer belt and transferred through the intermediate transfer belt. An auxiliary pressure roller is provided on the downstream side of the transfer and fixing section, and is in contact with the support roller that faces the pressure roller and constitutes the transfer fixing section via the intermediate transfer belt, and the contact area between the support roller, the belt, and the transfer paper is increased. 2. A copying apparatus characterized in that the transfer paper discharged from the transfer fixing section is introduced between the auxiliary pressure roller and the support roller while being in close contact with the intermediate transfer belt. （２）前記支持ローラなトナー像のトナーの溶融温度よ
りも低い温度となすと共に、転写定着部に導入される転
写材または圧接ローラの少くともいずれか一方を上記ト
ナーの溶融温度よりも高い温度となしたことを特徴とす
る特許請求の範囲第１項記載の複写装置。(2) The temperature of the supporting roller is lower than the melting temperature of the toner of the toner image, and the temperature of at least one of the transfer material introduced into the transfer fixing section or the pressure roller is higher than the melting temperature of the toner. A copying apparatus according to claim 1, characterized in that: （３）　　前記補助圧接ローラとして冷却手段を有する
熱伝導率の良いローラを使用したことを特徴とする特許
請求の範囲第１項または第２項記載の複写装置。(3) The copying apparatus according to claim 1 or 2, wherein a roller having good thermal conductivity and having a cooling means is used as the auxiliary pressure roller. （４）　　前記補助圧接ローラとしてヒートパイプから
なるローラを使用したことを特徴とする特許請求の範囲
第１項乃至第３項記載の複写装置。(4) The copying apparatus according to any one of claims 1 to 3, wherein a roller made of a heat pipe is used as the auxiliary pressure roller. （５）　　前記補助圧接ローラを複数個使用したことを
特徴とする特許請求の範囲第１項乃至第４項記載の複写
装置。(5) The copying apparatus according to any one of claims 1 to 4, characterized in that a plurality of the auxiliary pressure rollers are used.
JP18345781A 1981-11-16 1981-11-16 Copying device Pending JPS5885466A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP18345781A JPS5885466A (en) 1981-11-16 1981-11-16 Copying device
US06/441,795 US4455079A (en) 1981-11-16 1982-11-15 Image reproducing apparatus
DE19823242231 DE3242231A1 (en) 1981-11-16 1982-11-15 IMAGE DISPLAY DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18345781A JPS5885466A (en) 1981-11-16 1981-11-16 Copying device

Publications (1)

Publication Number Publication Date
JPS5885466A true JPS5885466A (en) 1983-05-21

Family

ID=16136108

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18345781A Pending JPS5885466A (en) 1981-11-16 1981-11-16 Copying device

Country Status (1)

Country Link
JP (1) JPS5885466A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6295568A (en) * 1985-10-23 1987-05-02 Fujitsu Ltd Transferring and fixing device
JPS6295569A (en) * 1985-10-23 1987-05-02 Fujitsu Ltd Transferring and fixing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6295568A (en) * 1985-10-23 1987-05-02 Fujitsu Ltd Transferring and fixing device
JPS6295569A (en) * 1985-10-23 1987-05-02 Fujitsu Ltd Transferring and fixing device

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