JP3310054B2 - Transfer belt device - Google Patents
Transfer belt deviceInfo
- Publication number
- JP3310054B2 JP3310054B2 JP15219393A JP15219393A JP3310054B2 JP 3310054 B2 JP3310054 B2 JP 3310054B2 JP 15219393 A JP15219393 A JP 15219393A JP 15219393 A JP15219393 A JP 15219393A JP 3310054 B2 JP3310054 B2 JP 3310054B2
- Authority
- JP
- Japan
- Prior art keywords
- transfer belt
- transfer
- roller
- length
- current
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は複写機，プリンタ等の画
像形成装置に用いられる転写ベルト装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer belt device used in an image forming apparatus such as a copying machine and a printer.
【０００２】[0002]
【従来の技術】複写機，プリンタ等の画像形成装置に用
いられる転写ベルト装置としては、図３に示すような転
写ベルト装置が提案されている。この転写ベルト装置で
は、転写ベルト１を駆動ローラ２および従動ローラ３に
掛け渡して回転させ、転写ベルト１の裏面に印加ローラ
４を接触させて電源装置５から印加ローラ４を介して転
写ベルト１に転写バイアスを印加する。2. Description of the Related Art As a transfer belt device used in an image forming apparatus such as a copying machine or a printer, a transfer belt device as shown in FIG. 3 has been proposed. In this transfer belt device, the transfer belt 1 is wrapped around a driving roller 2 and a driven roller 3 and rotated, and the application roller 4 is brought into contact with the back surface of the transfer belt 1. Is applied with a transfer bias.
【０００３】給紙部から送られてきた転写紙は印加ロー
ラ４から転写ベルト１を介して印加される電荷による帯
電で分極して転写ベルト１上の真電荷と転写紙の分極電
荷とにより静電気が発生し、この静電気により転写紙が
転写ベルト１上に吸着される。この転写紙は感光体６か
らトナー像が転写された後に転写ベルト１により搬送さ
れ、駆動ローラ２の所で転写紙の腰による曲率分離で転
写ベルト１から離れる。The transfer paper sent from the paper supply unit is polarized by the charge applied from the application roller 4 via the transfer belt 1, and becomes electrostatic by the true charge on the transfer belt 1 and the polarization charge of the transfer paper. The transfer paper is attracted to the transfer belt 1 by the static electricity. The transfer paper is conveyed by the transfer belt 1 after the toner image is transferred from the photoreceptor 6, and separates from the transfer belt 1 at the drive roller 2 by curvature separation due to the waist of the transfer paper.
【０００４】また、特開平３ー２６４９７５号公報に
は、像担持体と、これに当接する接触型の転写手段とを
備え、該当接部を転写部位として転写材を通過させると
ともに、前記転写手段に転写バイアスを印加して転写を
行うように構成した画像形成装置において、前記転写手
段の電流電圧特性を検知してこれによって得られた電圧
を保持したまま前記転写部位に転写材が存在するときに
前記転写手段を定電流制御することを特徴とする転写装
置が記載されている。Japanese Patent Application Laid-Open No. 3-264975 has an image carrier and a contact-type transfer unit that comes into contact with the image carrier. In the image forming apparatus configured to perform transfer by applying a transfer bias to the transfer member, when a transfer material is present at the transfer portion while detecting a current-voltage characteristic of the transfer unit and holding a voltage obtained thereby. A transfer device characterized in that the transfer means is controlled at a constant current.
【０００５】[0005]
【発明が解決しようとする課題】上記転写ベルト装置で
は、転写ベルトの部分的な抵抗値の異常があった場合に
は、転写部でその部分の電流の流れが悪くなり、転写電
荷が小さくなって転写側の転写紙へ転写されたトナーの
電荷量が不安定になる。このため、分離部で転写紙が転
写ベルトから分離する際に、転写紙上のトナー像が乱れ
て白抜けなどの異常画像が発生する。In the above-described transfer belt device, if there is a partial abnormality in the resistance value of the transfer belt, the flow of current in the transfer portion becomes poor in the transfer portion, and the transfer charge becomes small. As a result, the charge amount of the toner transferred to the transfer paper on the transfer side becomes unstable. For this reason, when the transfer paper is separated from the transfer belt at the separation unit, the toner image on the transfer paper is disturbed and an abnormal image such as white spots occurs.
【０００６】本発明は、上記欠点を改善し、異常画像の
発生をなくすことができる転写ベルト装置を提供するこ
とを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a transfer belt device which can improve the above-mentioned drawbacks and eliminate the occurrence of abnormal images.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、請求項１記載の発明は、像担持体上のトナー像を転
写材へ転写するための所定の抵抗値を有する転写ベルト
を具備する転写ベルト装置において、前記転写ベルトへ
転写バイアスを印加する２つ以上の電極と、この電極へ
定電流もしくは定電圧の転写バイアスを印加する電源装
置とを備え、前記電極を前記転写ベルトと前記像担持体
とのニップ部より後方に設けたものである。According to a first aspect of the present invention, there is provided a transfer belt having a predetermined resistance value for transferring a toner image on an image carrier to a transfer material. The transfer belt device includes two or more electrodes for applying a transfer bias to the transfer belt, and a power supply device for applying a constant current or constant voltage transfer bias to the electrodes. The electrodes are connected to the transfer belt and the image. Carrier
It is provided behind the nip portion .
【０００８】請求項２記載の発明は、請求項１記載の転
写ベルト装置において、前記２つ以上の電極の間の長さ
を、前記転写ベルトが掛けられたベルトテンションロー
ラと前記転写ベルトとの接触長さより長くしたものであ
る。According to a second aspect of the present invention, in the transfer belt device according to the first aspect, a length between the two or more electrodes is set.
A belt tension roller on which the transfer belt is hung.
And the length of contact between the roller and the transfer belt .
【０００９】請求項３記載の発明は、請求項２記載の転
写ベルト装置において、前記転写ベルトから電流をフィ
ードバックさせる部材を備え、この部材と前記電極との
間の長さを前記２つ以上の電極の間の長さより長くした
ものである。The invention according to claim 3 is the same as the invention according to claim 2.
In a copying belt device, current is supplied from the transfer belt to a filter.
A member to be driven back, and the member
The length between them is longer than the length between the two or more electrodes .
【００１０】[0010]
【００１１】[0011]
【００１２】[0012]
【作用】請求項１記載の発明では、転写ベルトは２つ以
上の電極を介して電源装置から定電流もしくは定電圧の
転写バイアスが印加され、電極が転写ベルトと像担持体
とのニップ部より後方にて転写ベルトへ転写バイアスを
印加する。 According to the first aspect of the invention, a constant current or constant voltage transfer bias is applied to the transfer belt from two or more electrodes from a power supply device , and the electrodes are connected to the transfer belt and the image carrier.
Transfer bias to the transfer belt behind the nip
Apply.
【００１３】請求項２記載の発明では、請求項１記載の
転写ベルト装置において、２つ以上の電極の間の長さ
は、転写ベルトが掛けられたベルトテンションローラと
転写ベルトとの接触長さより長い。 According to a second aspect of the present invention, in the transfer belt device according to the first aspect, a length between two or more electrodes is set.
Is a belt tension roller with a transfer belt
It is longer than the contact length with the transfer belt.
【００１４】請求項３記載の発明では、請求項２記載の
転写ベルト装置において、転写ベルトから上記部材より
電流がフィードバックされ、この部材と電極との間の長
さは２つ以上の電極の間の長さより長い。 [0014] In the present invention of claim 3, wherein, according to claim 2, wherein
In the transfer belt device, the transfer belt
The current is fed back and the length between this member and the electrode is
The length is longer than the length between two or more electrodes.
【００１５】[0015]
【００１６】[0016]
【００１７】[0017]
【実施例】図１は本発明の一実施例を示す。この実施例
は、転写ベルト１１、駆動ローラ１２、従動ローラ１
３、２つ以上例えば２つの印加ローラからなる電極１
４，１５、フィードバックローラ１６及び電源装置１７
を有し、複写機，プリンタ等の画像形成装置に用いられ
る。転写ベルト１１は、ゴム部材からなる中抵抗部材に
より構成される。駆動ローラ１２及び従動ローラ１３は
転写ベルト１１が掛け渡され、駆動ローラ１２は芯金が
金属で、その外周にゴム材料が巻かれた構成になってい
る。FIG. 1 shows an embodiment of the present invention. In this embodiment, the transfer belt 11, the driving roller 12, the driven roller 1
3, an electrode 1 composed of two or more, for example, two application rollers
4, 15; feedback roller 16 and power supply device 17
And used for image forming apparatuses such as copiers and printers. The transfer belt 11 is formed of a medium resistance member made of a rubber member. The transfer belt 11 is stretched around the drive roller 12 and the driven roller 13, and the drive roller 12 has a metal core and a rubber material wound around its outer periphery.
【００１８】従動ローラ１３は金属部材により構成され
る。印加ローラ１４，１５は金属部材により構成され、
転写ベルト１１の裏面に接触する。フィードバックロー
ラ１６は、金属部材により構成され、印加ローラ１５と
駆動ローラ１２との間に配置されて転写ベルト１１の裏
面に接触している。The driven roller 13 is made of a metal member. The application rollers 14 and 15 are made of a metal member,
It contacts the back surface of the transfer belt 11. The feedback roller 16 is made of a metal member, is disposed between the application roller 15 and the drive roller 12, and is in contact with the back surface of the transfer belt 11.
【００１９】ドラム状の感光体からなる像担持体１８は
周知のように帯電装置により均一に帯電された後に露光
装置により画像露光を受けて静電潜像が形成され、この
静電潜像が現像装置により現像されてトナー像になった
後に転写位置に到達する。この感光体１８は転写位置で
転写ベルト１１と接触する。駆動ローラ１２には図示し
ない駆動源により図示矢印方向の回転力が伝達され、駆
動ローラ１２の外周面と転写ベルト１１の裏面がゴム面
同志で摩擦係数が高いために駆動ローラ１２の回転力が
スリップすることなく転写ベルト１１に伝達されて転写
ベルト１１が回転する。従動ローラ１３は転写ベルト１
１の動きに連動してつれ回りする。As is well known, the image carrier 18 composed of a drum-shaped photoreceptor is uniformly charged by a charging device and then subjected to image exposure by an exposure device to form an electrostatic latent image. After the toner image is developed by the developing device, the toner image reaches the transfer position. The photoreceptor 18 contacts the transfer belt 11 at the transfer position. Rotational force in the direction of the arrow shown in the figure is transmitted to the drive roller 12 by a drive source (not shown), and since the outer peripheral surface of the drive roller 12 and the back surface of the transfer belt 11 are rubber surfaces and have a high friction coefficient, the rotational force of the drive roller 12 is reduced. It is transmitted to the transfer belt 11 without slipping, and the transfer belt 11 rotates. The driven roller 13 is the transfer belt 1
It rotates in conjunction with the movement of 1.
【００２０】電源装置１７は、電源から印加ローラ１
４，１５へ転写バイアスを印加し、かつ、電流制御部に
て電源から印加ローラ１４，１５を介して転写ベルト１
１へ供給する電流Ｉ1と、転写ベルト１１からフィード
バックローラ１６を介してフィードバックされる電流Ｉ
2とを比較してその差分(Ｉ1−Ｉ2)が一定値Ｋとなるよ
うに電源の出力を制御することによって、転写ベルト１
１から感光体１８へ流れる電流を一定値として常に安定
した転写条件でトナー像の転写を行わせる。The power supply 17 is provided with a power supply roller 1 from a power supply.
Transfer bias is applied to the transfer belt 1 and the transfer belt 1 via the application rollers 14 and 15 from a power source by a current control unit.
And current I 1 supplied to the 1, a current is fed back through a feedback roller 16 from the transfer belt 11 I
2 by controlling the output of the power supply so that the difference (I 1 −I 2 ) becomes a constant value K.
The current flowing from 1 to the photoreceptor 18 is set to a constant value so that the transfer of the toner image is always performed under stable transfer conditions.
【００２１】この時、転写ベルト１１は互いに離れた２
つの印加ローラ１４，１５より電流が印加されるので、
転写ベルト１１の裏面に局部的に抵抗異常(抵抗値の高
い所)があっても印加ローラ１４，１５のどちらかによ
り電流が供給されてトナー像の転写が安定して行われ
る。また、電源装置１７の電流制御部は、電源から印加
ローラ１４，１５を介して転写ベルト１１へ供給する電
流Ｉ1と、転写ベルト１１からフィードバックローラ１
６を介してフィードバックされる電流Ｉ2との差分(Ｉ1
−Ｉ2)を演算する減算手段と、この減算手段の演算結果
により(Ｉ1−Ｉ2)が一定値Ｋとなるように電源から印加
ローラ１４，１５への電流Ｉ1を制御する電流制御手段
とにより構成される。At this time, the transfer belt 11 is
Since current is applied from the two application rollers 14 and 15,
Even if there is a local resistance abnormality (where the resistance value is high) on the back surface of the transfer belt 11, current is supplied by one of the application rollers 14 and 15, and the transfer of the toner image is performed stably. The current control unit of the power supply device 17 includes a current I 1 supplied from the power supply to the transfer belt 11 via the application rollers 14 and 15 and a feedback roller 1 from the transfer belt 11.
The difference between the current I 2 which is fed back via the 6 (I 1
-I 2 ) and current control for controlling the current I 1 from the power supply to the application rollers 14 and 15 so that (I 1 −I 2 ) becomes a constant value K based on the result of the operation of the subtraction means. Means.
【００２２】給紙部から送られてきた転写紙は印加ロー
ラ１４，１５から転写ベルト１１を介して印加される電
荷による帯電で分極して転写ベルト１１上の真電荷と転
写紙の分極電荷とにより静電気が発生し、この静電気に
より転写紙が転写ベルト１１上に吸着される。この転写
紙は感光体１８と転写ベルト１１とで形成されるニップ
部で感光体１８からトナー像が転写された後に転写ベル
ト１１により搬送される。転写紙は転写ベルト１１によ
る搬送中に中抵抗の転写ベルト１１及びフィードバック
ローラ１６を通して徐々に帯電量が緩和される。そし
て、帯電量の緩和で静電引力の弱まった転写紙は駆動ロ
ーラ１２の所で転写紙の腰による曲率分離で転写ベルト
１１から分離されて図示しない定着部へ送られる。The transfer paper sent from the paper feeding unit is polarized by the charge applied from the application rollers 14 and 15 via the transfer belt 11 to be polarized, so that the true charge on the transfer belt 11 and the polarization charge of the transfer paper are changed. As a result, static electricity is generated, and the transfer paper is attracted to the transfer belt 11 by the static electricity. The transfer paper is conveyed by the transfer belt 11 after a toner image is transferred from the photoconductor 18 at a nip formed by the photoconductor 18 and the transfer belt 11. The amount of charge of the transfer paper is gradually reduced through the transfer belt 11 having medium resistance and the feedback roller 16 during the conveyance by the transfer belt 11. Then, the transfer paper whose electrostatic attraction is weakened by the reduction of the charge amount is separated from the transfer belt 11 by the curvature separation of the transfer paper at the drive roller 12 and sent to a fixing unit (not shown).
【００２３】このように、転写ベルト１１に転写バイア
スを印加する印加ローラ１４，１５が２つあるので、万
一転写ベルト１１に抵抗値の高い部分があっても転写電
荷が２つの印加ローラ１４，１５のいずれかから印加さ
れ、白抜け等の異常画像の発生をなくすことができる。As described above, since there are two application rollers 14 and 15 for applying a transfer bias to the transfer belt 11, even if the transfer belt 11 has a portion having a high resistance value, the transfer charge is applied to the two application rollers 14 and 15. , 15 to prevent the occurrence of abnormal images such as white spots.
【００２４】また、印加ローラ１４，１５を転写ベルト
１１と感光体１８とのニップ部の前方又は前後に設ける
と、印加ローラ１４，１５と従動ローラ１３との間に転
写電荷ができ、転写位置でトナー像の転写が行われる前
にトナー像が若干転写されるというプリ転写が発生す
る。このプリ転写が原因となって画像チリが発生する。
しかし、図２に示すように印加ローラ１４，１５を転写
ベルト１１と感光体１８とのニップ部ａより後方(転写
ベルト１１の回転方向下流側)に設けたので、プリ転写
が発生しなくなって画像チリが発生しなくなる。If the application rollers 14 and 15 are provided in front of or behind the nip portion between the transfer belt 11 and the photosensitive member 18, a transfer charge is generated between the application rollers 14 and 15 and the driven roller 13, and the transfer position Therefore, pre-transfer occurs in which the toner image is slightly transferred before the transfer of the toner image is performed. This pre-transfer causes image dust.
However, as shown in FIG. 2, since the application rollers 14 and 15 are provided behind the nip portion a between the transfer belt 11 and the photosensitive member 18 (downstream in the rotation direction of the transfer belt 11), pre-transfer does not occur. Image dust does not occur.
【００２５】また、転写ベルト１１は円周方向(回転方
向)に対してこまかい抵抗ムラがあり、ハーフトーンな
どのトナー像を転写すると、その抵抗ムラに応じたムラ
画像が発生する。しかし、電源装置１７が電源から印加
ローラ１４，１５を介して転写ベルト１１へ供給する電
流Ｉ1と、転写ベルト１１からフィードバックローラ１
６を介してフィードバックされる電流Ｉ2との差分(Ｉ1
−Ｉ2)が一定値Ｋとなるように電流Ｉ1を制御するの
で、転写ベルト１１の抵抗ムラによるムラ画像の発生を
防止することができる。Further, the transfer belt 11 has fine resistance unevenness in the circumferential direction (rotational direction). When a toner image such as a halftone is transferred, an uneven image corresponding to the resistance unevenness is generated. However, the current I 1 supplied from the power supply to the transfer belt 11 from the power supply via the application rollers 14 and 15 and the current I 1 supplied from the transfer belt 11 to the feedback roller 1
The difference between the current I 2 which is fed back via the 6 (I 1
Since the current I 1 is controlled so that −I 2 ) becomes a constant value K, it is possible to prevent the occurrence of an uneven image due to the uneven resistance of the transfer belt 11.
【００２６】また、駆動ローラ１２にゴムローラを使用
し、かつ、画像形成装置の内部に結露防止ヒータが設け
られていると、駆動ローラ１２が加熱されて駆動ローラ
１２のゴムから加流剤などの添付剤が外部にしみ出して
きて転写ベルト１１の裏面に付着してしまう。これによ
り転写ベルト１１の抵抗値が高くなり、異常画像が発生
する。しかし、図２に示すように印加ローラ１４，１５
の間の長さＬ1は駆動ローラ１２と転写ベルト１１とが
接触している接触部の回転方向の長さＬ2に対してＬ1＞
Ｌ2の関係を有するので、印加ローラ１４，１５のいず
れかから転写ベルト１１に転写バイアスが印加されるの
で、異常画像の発生を防止することができる。When a rubber roller is used for the driving roller 12 and a dew condensation preventing heater is provided inside the image forming apparatus, the driving roller 12 is heated and the rubber of the driving roller 12 is used to remove the exfoliating agent. The adhesive exudes to the outside and adheres to the back surface of the transfer belt 11. As a result, the resistance value of the transfer belt 11 increases, and an abnormal image occurs. However, as shown in FIG.
The length L 1 is L 1 with respect to the driving roller 12 and the transfer belt 11 and the rotational direction of the contact portion in contact length L 2 between>
Because it has a relationship of L 2, since the transfer bias is applied to the transfer belt 11 from either the application roller 14 and 15, it is possible to prevent the occurrence of abnormal images.
【００２７】また、印加ローラ１４，１５の間の長さＬ
1より印加ローラ１５とフィードバックローラ１６との
間の長さＬ3が短いと、印加ローラ１４，１５から転写
ベルト１１へ印加された電流は大部分が感光体１８の方
向へ流れずにフィードバックローラ１６に流れてしま
い、トナー像の転写不足が生ずる。この不具合を解消す
るには、電源容量をアップする方式があるが、この方式
はコストアップとなる。そこで、この実施例では、コス
トをかけずにその不具合を解消するために、Ｌ1＜Ｌ3の
関係を成立させている。The length L between the application rollers 14 and 15
Shorter length L 3 between the application roller 15 and the feedback roller 16 than one when the current applied from the application roller 14, 15 to the transfer belt 11 is fed back roller without flowing the majority in the direction of the photoconductor 18 16 and insufficient transfer of the toner image occurs. To solve this problem, there is a method of increasing the power supply capacity, but this method increases the cost. Therefore, in this embodiment, a relationship of L 1 <L 3 is established in order to solve the problem without increasing the cost.
【００２８】また、電源装置１７は、電源から印加ロー
ラ１４，１５を介して転写ベルト１１へ供給する電流Ｉ
1と、転写ベルト１１からフィードバックローラ１６を
介してフィードバックされる電流Ｉ2との差分(Ｉ1−
Ｉ2)が一定値Ｋとなるように電流Ｉ1を制御したが、電
源から印加ローラ１４，１５を介して転写ベルト１１へ
供給する電流Ｉ1を一定に制御する定電流電源装置を用
いてフィードバックローラ１６を接地するようにしても
よく、また、電源から印加ローラ１４，１５を介して転
写ベルト１１へ供給する電圧を一定に制御する定電圧電
源装置を用いてフィードバックローラ１６を接地するよ
うにしてもよい。A power supply 17 supplies a current I supplied from the power supply to the transfer belt 11 via the application rollers 14 and 15.
1 and the difference between the current I 2 fed back from the transfer belt 11 via the feedback roller 16 (I 1 −
Although the current I 1 was controlled so that I 2 ) became a constant value K, a constant current power supply device for controlling the current I 1 supplied from the power supply to the transfer belt 11 via the application rollers 14 and 15 to a constant value was used. The feedback roller 16 may be grounded. Alternatively, the feedback roller 16 may be grounded using a constant voltage power supply that controls the voltage supplied from the power supply to the transfer belt 11 via the application rollers 14 and 15 at a constant level. It may be.
【００２９】[0029]
【発明の効果】以上のように請求項１記載の発明によれ
ば、像担持体上のトナー像を転写材へ転写するための所
定の抵抗値を有する転写ベルトを具備する転写ベルト装
置において、前記転写ベルトへ転写バイアスを印加する
２つ以上の電極と、この電極へ定電流もしくは定電圧の
転写バイアスを印加する電源装置とを備えたので、万一
転写ベルトに抵抗値の高い部分があっても転写電荷が２
つ以上の電極のいずれかから印加され、白抜け等の異常
画像の発生をなくすことができる。さらに、前記電極を
前記転写ベルトと前記像担持体とのニップ部より後方に
設けたので、プリ転写の発生を防止して画像チリの発生
を防止することができる。 As described above, according to the first aspect of the present invention, there is provided a transfer belt apparatus having a transfer belt having a predetermined resistance value for transferring a toner image on an image carrier to a transfer material. Since two or more electrodes for applying a transfer bias to the transfer belt and a power supply for applying a constant current or constant voltage transfer bias to the electrodes are provided, the transfer belt may have a portion having a high resistance value. Even if the transfer charge is 2
The voltage is applied from any one of the at least one electrode and the occurrence of an abnormal image such as white spots can be eliminated. Further, the electrode
Behind the nip between the transfer belt and the image carrier
Provided, preventing the occurrence of pre-transfer and generating image dust
Can be prevented.
【００３０】請求項２記載の発明によれば、請求項１記
載の転写ベルト装置において、前記２つ以上の電極の間
の長さを、前記転写ベルトが掛けられたベルトテンショ
ンローラと前記転写ベルトとの接触長さより長くしたの
で、異常画像の発生を防止することができる。 According to a second aspect of the present invention, in the transfer belt device according to the first aspect, between the two or more electrodes.
The length of the belt tension on which the transfer belt is hung.
Roller is longer than the contact length between the transfer belt and the transfer belt.
Thus, occurrence of an abnormal image can be prevented.
【００３１】請求項３記載の発明によれば、請求項２記
載の転写ベルト装置において、前記転写ベルトから電流
をフィードバックさせる部材を備え、この部材と前記電
極との間の長さを前記２つ以上の電極の間の長さより長
くしたので、コストをかけずに転写不足を解消すること
ができる。 According to the third aspect of the invention, the second aspect is provided.
A transfer belt device,
And a member for feeding back the
The length between the poles is longer than the length between the two or more electrodes.
Eliminate transfer deficiencies at no cost
Can be.
【００３２】[0032]
【００３３】[0033]
【図１】本発明の一実施例を示す概略図である。FIG. 1 is a schematic view showing one embodiment of the present invention.
【図２】同実施例の一部を示す概略図である。FIG. 2 is a schematic view showing a part of the embodiment.
【図３】従来の転写ベルト装置の一例を示す概略図であ
る。FIG. 3 is a schematic diagram illustrating an example of a conventional transfer belt device.
１１ 転写ベルト １２ 駆動ローラ １３ 従動ローラ １４，１５ 印加ローラ １６ フィードバックローラ １７ 電源装置 Reference Signs List 11 transfer belt 12 drive roller 13 driven roller 14, 15 application roller 16 feedback roller 17 power supply device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 轡田 昭夫 東京都大田区中馬込１丁目３番６号・株 式会社リコー内 (56)参考文献 特開 平４−241377（ＪＰ，Ａ) 特開 平３−231274（ＪＰ，Ａ) 特開 平４−329571（ＪＰ，Ａ) 特開 平２−110586（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 15/16 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akio Kutta 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (56) References JP-A-4-241377 (JP, A) JP JP-A-3-231274 (JP, A) JP-A-4-329571 (JP, A) JP-A-2-110586 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G03G 15 / 16
Claims (3)
ための所定の抵抗値を有する転写ベルトを具備する転写
ベルト装置において、前記転写ベルトへ転写バイアスを
印加する２つ以上の電極と、この電極へ定電流もしくは
定電圧の転写バイアスを印加する電源装置とを備え、前
記電極を前記転写ベルトと前記像担持体とのニップ部よ
り後方に設けたことを特徴とする転写ベルト装置。1. A transfer belt apparatus comprising a transfer belt having a predetermined resistance value for transferring a toner image on an image carrier to a transfer material, wherein two or more electrodes for applying a transfer bias to the transfer belt. When, and a power supply unit for applying a transfer bias of a constant current or constant voltage to the electrode, before
The electrode is defined as a nip between the transfer belt and the image carrier.
A transfer belt device provided behind the transfer belt.
前記２つ以上の電極の間の長さを、前記転写ベルトが掛
けられたベルトテンションローラと前記転写ベルトとの
接触長さより長くしたことを特徴とする転写ベルト装
置。2. The transfer belt device according to claim 1, wherein
The length between the two or more electrodes is set by the transfer belt.
Between the belt tension roller and the transfer belt
A transfer belt device having a length longer than a contact length .
前記転写ベルトから電流をフィードバックさせる部材を
備え、この部材と前記電極との間の長さを前記２つ以上
の電極の間の長さより長くしたことを特徴とする転写ベ
ルト装置。3. The transfer belt device according to claim 2, wherein
A member that feeds back current from the transfer belt
And the length between the member and the electrode is two or more.
A transfer belt device that is longer than the length between the electrodes .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15219393A JP3310054B2 (en) | 1993-06-23 | 1993-06-23 | Transfer belt device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15219393A JP3310054B2 (en) | 1993-06-23 | 1993-06-23 | Transfer belt device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0713440A JPH0713440A (en) | 1995-01-17 |
| JP3310054B2 true JP3310054B2 (en) | 2002-07-29 |
Family
ID=15535098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15219393A Expired - Fee Related JP3310054B2 (en) | 1993-06-23 | 1993-06-23 | Transfer belt device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3310054B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100899229B1 (en) * | 2008-02-28 | 2009-05-26 | (주)보고환경 | Method to clean the tunnel of water reservoir |
-
1993
- 1993-06-23 JP JP15219393A patent/JP3310054B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0713440A (en) | 1995-01-17 |
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