JPH0369977A - Transfer device for image forming device - Google Patents
Transfer device for image forming deviceInfo
- Publication number
- JPH0369977A JPH0369977A JP20569589A JP20569589A JPH0369977A JP H0369977 A JPH0369977 A JP H0369977A JP 20569589 A JP20569589 A JP 20569589A JP 20569589 A JP20569589 A JP 20569589A JP H0369977 A JPH0369977 A JP H0369977A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- transfer belt
- belt
- transfer material
- image
- 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
- 239000000463 material Substances 0.000 claims abstract description 27
- 230000003068 static effect Effects 0.000 claims description 10
- 230000008030 elimination Effects 0.000 claims description 7
- 238000003379 elimination reaction Methods 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 9
- 230000006866 deterioration Effects 0.000 abstract description 6
- 230000005684 electric field Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 108091008695 photoreceptors Proteins 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（１）発明の目的
（産業上の利用分野）
この発明は静電複写機、同プリンタなど静電転写プロセ
スを利用する画像形成装置、とくにその転写装置に関す
るものである。Detailed Description of the Invention (1) Purpose of the Invention (Field of Industrial Application) This invention relates to an image forming apparatus that uses an electrostatic transfer process, such as an electrostatic copying machine or a printer, and particularly to a transfer apparatus thereof. .
（従来技術と解決すべき課題）
上記のような方式の画像形成装置において、像担持体表
面に当接して、これと同期走行する転写ベルトを配設し
て転写部位を形成し、この転写ベルトによって紙などの
転写材を吸着させて該転写部位に搬送し、該部位で像担
持体側のトナー像を転写材に転移させるように構成した
画像形成装置が既に提案されていることはよく知られて
いるとおりである。(Prior Art and Problems to be Solved) In the image forming apparatus of the above type, a transfer belt is disposed that contacts the surface of the image carrier and runs in synchronization with the image carrier to form a transfer site, and this transfer belt It is well known that an image forming apparatus has already been proposed in which a transfer material such as paper is adsorbed and conveyed to the transfer site, and a toner image on the image carrier side is transferred to the transfer material at the site. As it is.
第３図はこのような画像形成装置の一例を示すもので、
図示矢印方向に回転走行する円筒状の像担持体（以下感
光体という）１に、一対のローラに懸架されて該感光体
１と同期走行するベルト２が当接配置されている。FIG. 3 shows an example of such an image forming apparatus.
A belt 2, which is suspended between a pair of rollers and runs synchronously with the photoreceptor 1, is disposed in contact with a cylindrical image carrier (hereinafter referred to as photoreceptor) 1 that rotates in the direction of the arrow in the figure.
感光体１表面が一次帯電器５によって一様に帯電され、
該帯電面に画像変調されたレーザビーム、原稿からの反
射光などの画像情報が付与されて静電潜像が形成される
。The surface of the photoreceptor 1 is uniformly charged by a primary charger 5,
Image information such as an image-modulated laser beam and reflected light from a document is applied to the charged surface to form an electrostatic latent image.
ついで、現像器７によって該潜像にトナーが供給されて
トナー像が形成され、さらに、感光体１の回転にともな
ってこのトナー像が前記転写部位に到来すると、転写帯
電器３によって転写バイアスが印加され、感光体側のト
ナー像は転写材に転移する。Next, the developing device 7 supplies toner to the latent image to form a toner image, and when the toner image arrives at the transfer site as the photoreceptor 1 rotates, the transfer charger 3 applies a transfer bias. The toner image on the photoreceptor side is transferred to the transfer material.
転写後、トナー像を担持する転写材は転写部位を離れて
転写ベルト２によって搬送され、さらに、該ベルトから
分離して定着袋Ｍ９に至ってトナー像が転写材、に定着
固定されて外部に排出される。After the transfer, the transfer material carrying the toner image leaves the transfer site and is conveyed by the transfer belt 2, and is further separated from the belt and reaches the fixing bag M9, where the toner image is fixed and fixed on the transfer material and is discharged to the outside. be done.
転写材が転写ベルトから分離されるときに、剥離放電に
よってトナーが飛散して水玉状の飛び散りが画像に形成
されるのを阻止するために、分離部近傍に帯電器４を配
設して転写材、転写ベルトを除電するようになっている
。When the transfer material is separated from the transfer belt, in order to prevent the toner from scattering due to peeling discharge and forming water droplets on the image, a charger 4 is disposed near the separation part to prevent the transfer. It is designed to eliminate static electricity from the material and transfer belt.
転写のさいに転写材に転移しなかった一部のトナーはク
リーナ１０に至って除去され、感光体は次の画像形成工
程に入ることになる。A portion of the toner that has not been transferred to the transfer material during transfer reaches the cleaner 10 and is removed, and the photoreceptor enters the next image forming process.
このような画像形成装置においては、前記帯電器４は画
質の劣化を防止するために必須のものではあるが、低湿
環境下では、転写材、転写ベルトに貯溜する電荷量が多
く、上記のような手段でこれらを十分：ご除電すること
が困難で、水玉状のトナーの飛び敗りを完全に阻止する
ことは出来ないのが実情であった。In such an image forming apparatus, the charger 4 is essential to prevent deterioration of image quality, but in a low humidity environment, a large amount of charge accumulates in the transfer material and transfer belt, and as described above, The reality is that it is difficult to remove the static electricity and it is not possible to completely prevent the droplet-like toner from flying off.
勿論、該帯電器４を大型にして除電機能を向上させるこ
とは当然考えられるが、このような仕方はスペースをと
ってコスト的に不利であり、オゾンの発生量も増大し、
異状放電発生のおそれも生ずるなどのために実用には適
しない。Of course, it is conceivable to make the charger 4 larger to improve its static elimination function, but such a method takes up space and is disadvantageous in terms of cost, and also increases the amount of ozone generated.
This is not suitable for practical use because there is a risk of abnormal discharge occurring.
本発明はこのような現状に鑑みてなされたものであって
、感光体と、転写材を搬送、転写するための転写ベルト
をそなえた画像形成装置において、上記のような、剥離
放電による画質の劣化を生ずることなく、環境にかかわ
らず、常時安定的に、良質の転写を遂行できるような転
写装置を提供することを目的とするものである。The present invention has been made in view of the current situation, and is intended to improve image quality due to peeling discharge as described above in an image forming apparatus equipped with a photoreceptor and a transfer belt for conveying and transferring a transfer material. It is an object of the present invention to provide a transfer device that can always stably perform high-quality transfer regardless of the environment without causing deterioration.
（２）発明の構成
（課題を解決する技術手段、その作用）上記の目的を達
成するため、本発明は、走行する像担持体と、ローラ対
に懸架されて、前記像担持体に当接して転写部位を形成
して像担持体と同期走行する無端状の転写ベルトとをそ
なえた画像形成装置において、該転写ベルトによって搬
送された転写材が転写後、転写ベルトから分離する側の
転写ベルト懸架ローラにバイアス電圧を印加する手段を
配したことを特徴とするちのである。(2) Structure of the invention (technical means for solving the problem, its effect) In order to achieve the above object, the present invention comprises a moving image carrier, a roller suspended from a pair of rollers, and abutting against the image carrier. In an image forming apparatus equipped with an endless transfer belt that forms a transfer site and runs in synchronization with an image carrier, the transfer belt is the side where the transfer material conveyed by the transfer belt is separated from the transfer belt after being transferred. It is characterized in that means for applying a bias voltage to the suspended roller is provided.
このように構成することによって、転写ベルトを用いる
画像形成装置において、転写材が転写ベルトから分離す
る部位における剥離放電の発生を阻止し、水玉状のトナ
ーの飛び敗りによる画質の劣化を阻止することが出来る
。With this configuration, in an image forming apparatus that uses a transfer belt, it is possible to prevent the occurrence of peeling discharge at the portion where the transfer material separates from the transfer belt, and to prevent deterioration of image quality due to flying droplets of toner. I can do it.
（実施例の説明）
第１図は本発明を適用した画像形成装置の要部の概略側
面図であって、前記第３国々示の装置と同様の画像形成
部材を備えており、また、対応する部分には同一の符号
を付して示してあり、それらについての説明は必要ない
かぎり省略する。(Description of Embodiments) FIG. 1 is a schematic side view of the main parts of an image forming apparatus to which the present invention is applied, and is equipped with image forming members similar to those of the apparatus shown in the third country. The same reference numerals are used to denote the same parts, and explanations thereof will be omitted unless necessary.
転写ベルト２は、体積抵抗率がＩＱ目Ωｃｍ程度の樹脂
で、厚み２００ｕｍの無端ベルト状に形成され、これに
よって転写材Ｐが図示右方から供給搬送されて、転写帯
電器３をそなえた転写部位Ａに到来する。The transfer belt 2 is made of resin with a volume resistivity of about IQ Ωcm, and is formed into an endless belt shape with a thickness of 200 um.The transfer belt 2 is used to supply and convey the transfer material P from the right side of the figure, and is attached to a transfer belt equipped with a transfer charger 3. Arrives at site A.
転写材の転写部位への到来とともに、転写帯電器３に転
写バイアスが印加され、よって形成される電界の作用で
感光体１例のトナー像は転写材に転移する。When the transfer material arrives at the transfer site, a transfer bias is applied to the transfer charger 3, and the toner image on the photoreceptor is transferred to the transfer material by the action of the electric field formed.
その後、転写帯電器３によって帯電した転写べルト２に
静電吸着した転写材は分離部Ｂに至り、ベルト２から分
離して、さらに定着装置９に供給されることになる。Thereafter, the transfer material electrostatically attracted to the transfer belt 2 charged by the transfer charger 3 reaches the separation section B, is separated from the belt 2, and is further supplied to the fixing device 9.
このような装置において１図示のものにおいては、転写
ベルト２の分離部Ｂ側のローラ１１には、高圧トランス
１２が接続してあって、これによって、たとえば、ピー
ク間電圧２．５ＫＶ、周波数５００Ｈｚの交流電圧を印
加するものとする。In the one shown in the figure, a high-voltage transformer 12 is connected to the roller 11 of the transfer belt 2 on the side of the separating section B. An alternating current voltage of .
これによって帯電している転写ベル−トスは除電されて
転写材Ｐに対する吸着作用が減退し、剥離放電を発生す
るようなことなく分離するので、トナーの飛び敗りによ
る画像の劣化を生ずることがない。As a result, the charged transfer belt toss is neutralized, its adhesion to the transfer material P is reduced, and it is separated without causing peeling discharge, thereby preventing image deterioration due to toner scattering. do not have.
また、このように構成することによって、前述のような
、分離除電のための帯電器を別設する必要がないので、
省スペースになり、コスト的にも有利であるばかりでな
く、オゾンの発生を抑えることも可能である。In addition, with this configuration, there is no need to separately install a charger for separating static electricity, as described above.
This not only saves space and is advantageous in terms of cost, but also makes it possible to suppress ozone generation.
この種の装置における分離時のトナーの飛び敗りは、一
般に転写ベルトの抵抗値が高いほど発生しやすく、上記
のような、体積抵抗率１０■Ωｃｍは一例で、抵抗値に
対して、分離部位におけるローラ１１の印加電圧を適当
に設定することによってトナーの飛び敗りを適宜に抑制
することが可能である。In general, the higher the resistance value of the transfer belt, the more likely it is that toner scattering occurs during separation in this type of device. By appropriately setting the voltage applied to the roller 11 at that location, it is possible to appropriately suppress toner scattering.
実験によれば、体積抵抗率が１０ｆ〜ＩＱＩＩΩｃｍの
範囲で除電効果が確認されている。According to experiments, the static elimination effect has been confirmed when the volume resistivity is in the range of 10f to IQIIΩcm.
また、前述のように、トナーの飛び敗りは低湿ず
環境かにおいて顕著であるので、湿度を検知して、これ
によってローラ１１への印加電圧を可変にすることも、
もちろん可能である。Further, as mentioned above, toner scattering is noticeable in a low humidity environment, so it is also possible to detect humidity and vary the voltage applied to the roller 11 based on this.
Of course it is possible.
さらに、転写ベルト２の材質によっては、分離部位のロ
ーラ１１に印加する電圧をＩＫＶ程度の直流電圧とする
ことによって良好な除電効果を得ることができる。Further, depending on the material of the transfer belt 2, a good static elimination effect can be obtained by setting the voltage applied to the roller 11 at the separation site to be a DC voltage of approximately IKV.
第２図は本発明の他の実施例を示すもので、図は転写ベ
ルトの転写材を分離する部分近傍のみを示しである。FIG. 2 shows another embodiment of the present invention, in which only the vicinity of the portion of the transfer belt where the transfer material is separated is shown.
この装置においては、ローラ１１に分離バイアスを印加
するとともに、除電ブラシ、ないしは除電針１３を配設
しである。In this device, a separation bias is applied to the roller 11, and a static elimination brush or static elimination needle 13 is provided.
このように構成することによって、さらに良好な除電作
用が得られる。With this configuration, even better static elimination action can be obtained.
（３）発明の効果
第１図は本発明の実施例を示す画像形成装置の要部の概
略側面図、
第２図は他の実施例を示す転写材分離部分近傍を示す側
面図、
第３図は公知の画像形成装置の概略側面図である。(3) Effects of the invention FIG. 1 is a schematic side view of the main parts of an image forming apparatus showing an embodiment of the invention; FIG. 2 is a side view showing the vicinity of the transfer material separation part showing another embodiment; The figure is a schematic side view of a known image forming apparatus.
■・・・感光体、２・・・転写ベルト、３・・・転写帯
電器、１２・・・トランス。■...Photoreceptor, 2...Transfer belt, 3...Transfer charger, 12...Transformer.
行する像担持体と、これに当接ないし近接して同期走行
する転写ベルトを備えた画像形成装置において、該ベル
トによって搬送される転写材がベルトから分離する位置
において、剥離放電を発生することを有効に阻止し、放
電によるトナーの飛び敗りに起因する画質の劣化を有効
に抑制して良質の画像を得るのに資するところが大であ
る。In an image forming apparatus equipped with an image bearing member that moves and a transfer belt that runs synchronously in contact with or in close proximity to the image carrier, a separation discharge occurs at a position where the transfer material conveyed by the belt separates from the belt. This greatly contributes to effectively preventing deterioration in image quality caused by toner scattering due to discharge and obtaining high-quality images.
Claims (2)
記像担持体に当接して転写部位を形成して像担持体と同
期走行する無端状の転写ベルトとをそなえた画像形成装
置において、 該転写ベルトによって搬送された転写材が転写後、転写
ベルトから分離する側の転写ベルト懸架ローラにバイア
ス電圧を印加する手段を配したことを特徴とする転写装
置。(1) An image forming apparatus that includes a traveling image carrier and an endless transfer belt that is suspended between a pair of rollers, contacts the image carrier to form a transfer site, and travels in synchronization with the image carrier. A transfer device according to the present invention, further comprising means for applying a bias voltage to a transfer belt suspension roller on a side where the transfer material conveyed by the transfer belt is separated from the transfer belt after being transferred.
ルト部分に除電ブラシを当接してなる特許請求の範囲第
１項記載の転写装置。(2) The transfer device according to claim 1, wherein a static elimination brush is brought into contact with a portion of the transfer belt that is in contact with a roller to which a bias voltage is applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1205695A JP2707331B2 (en) | 1989-08-10 | 1989-08-10 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1205695A JP2707331B2 (en) | 1989-08-10 | 1989-08-10 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0369977A true JPH0369977A (en) | 1991-03-26 |
| JP2707331B2 JP2707331B2 (en) | 1998-01-28 |
Family
ID=16511179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1205695A Expired - Fee Related JP2707331B2 (en) | 1989-08-10 | 1989-08-10 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2707331B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5523834A (en) * | 1991-10-25 | 1996-06-04 | Canon Kabushiki Kaisha | Image forming apparatus having recording material separating means |
| US5557389A (en) * | 1993-10-29 | 1996-09-17 | Mita Industrial Co., Ltd. | Device for separating a transfer paper utilizing a separation voltage |
| EP0883037A2 (en) * | 1997-06-04 | 1998-12-09 | Canon Kabushiki Kaisha | An image forming apparatus |
| US5966578A (en) * | 1997-07-28 | 1999-10-12 | Canon Kabushiki Kaisha | Heat-pressure fixing device and silicone rubber roller |
| US6097924A (en) * | 1998-07-03 | 2000-08-01 | Fuji Xerox Co., Ltd. | Image forming apparatus having a separation discharger |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62215976A (en) * | 1986-03-18 | 1987-09-22 | Matsushita Electric Ind Co Ltd | Transfer and carrying device |
| JPS6383773A (en) * | 1986-09-29 | 1988-04-14 | Matsushita Electric Ind Co Ltd | Transferring and conveying device |
-
1989
- 1989-08-10 JP JP1205695A patent/JP2707331B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62215976A (en) * | 1986-03-18 | 1987-09-22 | Matsushita Electric Ind Co Ltd | Transfer and carrying device |
| JPS6383773A (en) * | 1986-09-29 | 1988-04-14 | Matsushita Electric Ind Co Ltd | Transferring and conveying device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5523834A (en) * | 1991-10-25 | 1996-06-04 | Canon Kabushiki Kaisha | Image forming apparatus having recording material separating means |
| US5557389A (en) * | 1993-10-29 | 1996-09-17 | Mita Industrial Co., Ltd. | Device for separating a transfer paper utilizing a separation voltage |
| EP0883037A2 (en) * | 1997-06-04 | 1998-12-09 | Canon Kabushiki Kaisha | An image forming apparatus |
| EP0883037A3 (en) * | 1997-06-04 | 1999-03-17 | Canon Kabushiki Kaisha | An image forming apparatus |
| US6226486B1 (en) | 1997-06-04 | 2001-05-01 | Canon Kabushiki Kaisha | Image forming apparatus with electrically grounded roller |
| US5966578A (en) * | 1997-07-28 | 1999-10-12 | Canon Kabushiki Kaisha | Heat-pressure fixing device and silicone rubber roller |
| US6097924A (en) * | 1998-07-03 | 2000-08-01 | Fuji Xerox Co., Ltd. | Image forming apparatus having a separation discharger |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2707331B2 (en) | 1998-01-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |