JP3330721B2 - Transfer belt device - Google Patents
Transfer belt deviceInfo
- Publication number
- JP3330721B2 JP3330721B2 JP05154994A JP5154994A JP3330721B2 JP 3330721 B2 JP3330721 B2 JP 3330721B2 JP 05154994 A JP05154994 A JP 05154994A JP 5154994 A JP5154994 A JP 5154994A JP 3330721 B2 JP3330721 B2 JP 3330721B2
- Authority
- JP
- Japan
- Prior art keywords
- transfer paper
- paper guide
- transfer
- transfer belt
- guide member
- 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 - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電子写真方式の画像
形成装置において、像担持体上のトナー像を、転写ベル
トに電圧を印加しながら転写紙に転写する転写ベルト装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer belt device for transferring a toner image on an image carrier to transfer paper while applying a voltage to the transfer belt in an electrophotographic image forming apparatus.
【０００２】[0002]
【従来の技術】従来より、像担持体である感光体ドラム
上のトナー像を、転写紙上に転写する方式には種々のも
のが用いられているが、その一つとして、転写ベルトに
より転写紙を搬送しつつ、これを感光体ドラム表面に接
触させて転写を行う転写ベルト方式は公知である。この
転写ベルト方式による転写過程において、低温低湿時や
両面コピー時等、転写紙の含水率が低下した場合、転写
紙の表面抵抗が非常に高くなる。このような転写紙は、
転写部で帯電されると、非常に多くの電荷を保持したま
まの状態で、転写ベルト後端の分離部に来るので、分離
時に急激な電界変化や放電によってトナー乱れが発生し
やすい。このため、上記の不具合を防ぐために、通常前
記分離部には、転写紙を除電するためのコロナ除電器を
設けている(例えば、特開平３−２３１７８３号公報)。2. Description of the Related Art Conventionally, various methods have been used for transferring a toner image on a photosensitive drum, which is an image carrier, onto transfer paper. A transfer belt system is known, in which the transfer is carried out by bringing the photosensitive drum into contact with the surface of the photosensitive drum while transferring the toner. In the transfer process using the transfer belt method, when the water content of the transfer paper decreases, for example, during low-temperature low-humidity or double-sided copying, the surface resistance of the transfer paper becomes extremely high. Such transfer paper is
When charged at the transfer section, the toner comes to the separation section at the rear end of the transfer belt while maintaining a very large amount of electric charge, and thus toner is likely to be disturbed by a sudden electric field change or discharge at the time of separation. For this reason, in order to prevent the above-mentioned problems, a corona neutralizer for neutralizing the transfer paper is usually provided in the separating section (for example, Japanese Patent Application Laid-Open No. 3-231983).
【０００３】[0003]
【発明が解課決しようとする課題】しかしながら、上記
従来の転写ベルト装置においては、コロナ除電器による
除電は、除電効果において優れているが、その配置部位
が問題を生じさせる。なぜなら、コロナ除電器は、転写
ベルトと定着装置との間に配置されているため、定着装
置において、転写紙の搬送不全が生じた場合に、手作業
でジャムした転写紙を取り除こうとすると、その近傍に
コロナ除電器のような高電圧の印加される部材が存在し
ているため、メンテナンス作業の邪魔になり、安全性の
上からも好ましくないという問題点があった。そこで、
この発明は、上述した従来の問題点を解消し、コロナ除
電器を用いることなく、転写紙の除電を行うことができ
る簡単な構成の転写ベルト装置を提供することを課題と
している。However, in the above-mentioned conventional transfer belt device, the static elimination by the corona static eliminator is excellent in the static elimination effect, but the arrangement portion causes a problem. Because the corona eliminator is located between the transfer belt and the fixing device, if the fixing device fails to convey the transfer paper, if the user tries to remove the jammed transfer paper manually, the Since a member to which a high voltage is applied, such as a corona static eliminator, is present in the vicinity, it hinders maintenance work, and is not preferable from the viewpoint of safety. Therefore,
SUMMARY OF THE INVENTION It is an object of the present invention to provide a transfer belt device having a simple configuration capable of eliminating the above-mentioned conventional problems and eliminating charge on a transfer sheet without using a corona remover.
【０００４】[0004]
【課題を解決するための手段】この発明の要旨は、請求
項１では、電気抵抗が中抵抗である材料から形成された
転写ベルトを有し、像担持体上のトナー画像を転写紙上
に転写する転写ベルト装置において、転写紙が分離する
前記転写ベルトの後端部に近接して配置され、転写紙を
案内する平坦面の転写紙案内面を有し、この転写紙案内
面の途中に、毛先を転写紙案内面と同一面に露出させな
いように、その側面部を露出した形で除電ブラシを配設
した転写紙ガイド部材を備えたことである。また、請求
項２では、前記転写紙案内面部分を導電性材料で形成し
たこと、請求項３では、前記転写紙ガイド部材を金属材
料で形成したこと、請求項４では、前記転写紙ガイド部
材の導電性部分を接地したこと、請求項５では、前記転
写紙ガイド部材の前記転写ベルトの近接する側の端部表
面を絶縁材料で形成したこと、さらに、請求項６では、
前記転写紙案内面の途中に配設した、前記除電ブラシ側
面部の露出部の幅をＬとすると、１.０≦Ｌ≦３.０（m
m）としたことである。According to a first aspect of the present invention, there is provided a transfer belt formed of a material having a medium electric resistance, and a toner image on an image carrier is transferred onto a transfer paper. In the transfer belt device, the transfer paper is disposed close to the rear end of the transfer belt where the transfer paper is separated, and has a flat transfer paper guide surface for guiding the transfer paper. In order to prevent the bristle tips from being exposed on the same surface as the transfer paper guide surface, a transfer paper guide member provided with a static elimination brush with its side surface exposed is provided. In a second aspect, the transfer paper guide surface portion is formed of a conductive material. In a third aspect, the transfer paper guide member is formed of a metal material. In a fourth aspect, the transfer paper guide member is formed. In a fifth aspect, an end surface of the transfer paper guide member on the side close to the transfer belt is formed of an insulating material.
Assuming that the width of the exposed portion of the side surface of the static elimination brush disposed in the middle of the transfer paper guide surface is L, 1.0 ≦ L ≦ 3.0 (m
m).
【０００５】[0005]
【作用】したがって、請求項１では、転写紙が転写紙ガ
イド部材の転写紙案内面を搬送される際、露出した除電
ブラシの側面部で除電されるが、除電ブラシの毛先を露
出させず、側面部を利用して除電するため、除電過多に
ならず、除電後の転写紙は転写紙案内面に吸着して、安
定して搬送される。また、請求項２では、前記転写紙案
内面部分は、導電性材料で形成されているため、転写紙
との静電吸着力が高まり、安定した搬送が行われる。ま
た、請求項３では、前記転写紙ガイド部材は、金属材料
で形成されているため、転写紙案内面の平面度が出し易
くなり、転写紙の均一な分離を行える。According to the first aspect of the present invention, when the transfer paper is conveyed on the transfer paper guide surface of the transfer paper guide member, the charge is removed by the exposed side surface of the charge removal brush, but the tip of the charge removal brush is not exposed. Since the charge is eliminated by using the side surface, the charge is not excessively eliminated, and the transfer paper after the charge is adsorbed on the transfer paper guide surface and is stably conveyed. In the second aspect, since the transfer paper guide surface portion is formed of a conductive material, the electrostatic attraction force with the transfer paper is increased, and stable conveyance is performed. In the third aspect, since the transfer paper guide member is formed of a metal material, the transfer paper guide surface can easily have a flatness, and uniform separation of the transfer paper can be performed.
【０００６】また、請求項４では、前記転写紙ガイド部
材の導電性部分を接地することにより、連続してコピー
を行った時に、転写紙ガイド部材に帯電する電荷を逃が
して、転写紙の除電能力が低下しないようにする。ま
た、請求項５では、前記転写紙ガイド部材の前記転写ベ
ルトの近接する側の端部表面は、絶縁材料で形成されて
いるため、転写紙ガイド部材と転写ベルトとの放電が防
止される。さらに、請求項６では、前記転写紙案内面の
途中に配設した、前記除電ブラシ側面の露出幅Ｌを、
１.０≦Ｌ≦３.０（mm）とすることにより、露出幅Ｌが
１mmより小さい時の転写紙の除電不足や、露出幅Ｌが
３.０mmより大きい時の除電過多による異常画像の発生
を防止する。According to a fourth aspect of the present invention, by electrically grounding the conductive portion of the transfer paper guide member, the charge charged on the transfer paper guide member during continuous copying is released to remove the transfer paper. Make sure your ability is not degraded. Further, since the end surface of the transfer paper guide member on the side close to the transfer belt is formed of an insulating material, discharge of the transfer paper guide member and the transfer belt is prevented. Further, in claim 6, the exposed width L of the side surface of the neutralization brush, which is provided in the middle of the transfer paper guide surface,
By setting 1.0 ≦ L ≦ 3.0 (mm), insufficient image elimination of the transfer paper when the exposure width L is smaller than 1 mm and abnormal image due to excessive static elimination when the exposure width L is larger than 3.0 mm. Prevent occurrence.
【０００７】[0007]
【実施例】以下、この発明の実施例を図面を参照して説
明する。図１において、光導電性の感光体ドラム１に当
接して転写ベルト２が配置されている。この転写ベルト
２は、駆動ローラ３と従動ローラ４により張架され、電
気抵抗が中抵抗であるゴム材料で形成されている。駆動
ローラ３は金属ローラの外周面に転写ベルト２との摩擦
係数を高めるためのゴム層を巻装して形成され、従動ロ
ーラ４は金属ローラから成っている。そして、転写ベル
ト２の内周面の、感光体ドラム１と転写ベルト２とのニ
ップ部１３から駆動ローラ３の方へ所定距離だけ離れた
位置に、電圧印加のための印加ローラ５が当接して配置
され、また、この印加ローラと駆動ローラ３の間にフィ
ートバック板６が転写ベルト２の内周面に接触して配置
されている。この印加ローラ５は、金属ローラであっ
て、転写ベルト２の回転に従動して回転し、フィートバ
ック板６は金属板であって、これらは共に電源７に接続
されている。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a transfer belt 2 is disposed in contact with a photoconductive photosensitive drum 1. The transfer belt 2 is stretched by a driving roller 3 and a driven roller 4, and is formed of a rubber material having an intermediate electric resistance. The driving roller 3 is formed by winding a rubber layer around the outer peripheral surface of the metal roller to increase the coefficient of friction with the transfer belt 2, and the driven roller 4 is formed of a metal roller. An application roller 5 for applying a voltage abuts on the inner peripheral surface of the transfer belt 2 at a position away from the nip portion 13 between the photosensitive drum 1 and the transfer belt 2 toward the drive roller 3 by a predetermined distance. The foot back plate 6 is disposed between the application roller and the driving roller 3 in contact with the inner peripheral surface of the transfer belt 2. The application roller 5 is a metal roller and rotates following the rotation of the transfer belt 2. The foot back plate 6 is a metal plate, and both of them are connected to a power source 7.
【０００８】また、転写ベルト２の後端部に近接して、
転写紙ガイド部材９が配置され、その後方に、定着ロー
ラ１２方向ヘ転写紙を案内する定着入口ガイド部材１１
が配置されている。この転写紙ガイド部材９には、図２
に示すように、平坦な転写紙案内面９ａ及び９ｂが形成
されており、これらの間に、除電ブラシ１０がその側面
１０ａを露出した形で、その露出幅（露出ギャップ）Ｌ
で設けられている。したがって、除電ブラシ１０の毛先
１０ｂは転写紙案内面９ａ及び９ｂと同一平面に露出し
ていない。Further, in the vicinity of the rear end of the transfer belt 2,
A transfer paper guide member 9 is disposed, and a fixing inlet guide member 11 for guiding the transfer paper toward the fixing roller 12 is provided behind the transfer paper guide member 9.
Is arranged. As shown in FIG.
As shown in FIG. 5, flat transfer paper guide surfaces 9a and 9b are formed, and an exposed width (exposed gap) L is formed between the flat transfer paper guide surfaces 9a and 9b with the charge removing brush 10 exposing its side surface 10a.
It is provided in. Therefore, the bristle tips 10b of the discharging brush 10 are not exposed on the same plane as the transfer paper guide surfaces 9a and 9b.
【０００９】上記構成において、転写ベルト２は矢印Ａ
方向へ回動し、転写紙８は転写ベルト２の上面の先端部
（図中右端部）に載せられ、転写ベルト２の回転に伴っ
てベルト上を後方へ搬送され、ニップ部１３において感
光体ドラム１の周面に接触する。この時、電源７から印
加ローラ５に電流Ｉ1が印加される。印加された電流Ｉ1
の一部は転写ベルトを右方へ流れて転写電流となり、感
光体ドラム１のトナー画像を転写紙８に転写する。印加
電流Ｉ1の残りの部分は、転写ベルト２を左方へ流れて
帰還電流Ｉ2となり、フィードバック板６から電源７へ
戻る。In the above configuration, the transfer belt 2 has an arrow A
The transfer paper 8 is placed on the top end (the right end in the figure) of the upper surface of the transfer belt 2, and is conveyed backward on the belt with the rotation of the transfer belt 2. It contacts the peripheral surface of the drum 1. At this time, a current I 1 is applied from the power supply 7 to the application roller 5. Applied current I 1
A part of flows through the transfer belt to the right to become a transfer current, and transfers the toner image on the photosensitive drum 1 to the transfer paper 8. The remaining portion of the applied current I 1, the feedback current I 2 becomes flows transfer belt 2 to the left, returning from the feedback plate 6 to the power supply 7.
【００１０】このようにして、感光体ドラム１上のトナ
ー画像は、転写紙８に転写されるが、この転写の際に転
写紙８は不可避的に帯電する。トナー画像を転写された
転写紙８は、転写ベルト２の回転に伴い、定着ローラ１
２方向へ搬送され、転写紙ガイド部材９により案内され
つつ、除電ブラシ１０により除電された後、定着入り口
ガイド１１へ案内される。定着は定着ローラ１２のニッ
プ部で行われ、転写紙８は、このニップ部を通過する際
にトナー画像が定着される。In this way, the toner image on the photosensitive drum 1 is transferred to the transfer paper 8, and at the time of this transfer, the transfer paper 8 is inevitably charged. The transfer paper 8 to which the toner image has been transferred is transferred to the fixing roller 1 by the rotation of the transfer belt 2.
After being conveyed in two directions and guided by the transfer paper guide member 9 and neutralized by the neutralization brush 10, it is guided to the fixing entrance guide 11. The fixing is performed at the nip portion of the fixing roller 12, and the toner image is fixed on the transfer paper 8 when passing through the nip portion.
【００１１】次に、転写紙ガイド部材９の作用の詳細に
ついて説明する。転写ベルト２の後端（図中左端）の分
離部に来た転写紙は、転写紙８自身の腰の強さにより、
転写ベルト２から分離され、転写紙ガイド部材９の転写
紙案内面９ａに案内される。この時、転写紙案内面９ａ
は平面であるので、従来のようにリブ形状を用いた場合
のように、リブに沿った異常画像の発生がない（リブ形
状は、転写紙８との摩擦帯電により、リブ先端に電界が
集中するため、リブに沿った異常画像が発生し易い）。Next, the operation of the transfer paper guide member 9 will be described in detail. The transfer paper that has arrived at the separation portion at the rear end (left end in the figure) of the transfer belt 2 depends on the stiffness of the transfer paper 8 itself.
It is separated from the transfer belt 2 and is guided by the transfer paper guide surface 9 a of the transfer paper guide member 9. At this time, the transfer paper guide surface 9a
Is a flat surface, so that there is no occurrence of an abnormal image along the rib as in the case of using the rib shape as in the prior art. Therefore, an abnormal image along the rib is likely to occur).
【００１２】そして、転写案内面９ａを通過した転写紙
８は、除電ブラシ１０の側面部１０ａを露出した部分に
て、空隙放電により除電される。この場合の転写紙８の
除電は、完全に行う必要はなく、転写紙ガイド部材９か
ら分離する時や、定着入り口ガイド板１１に接近する時
に、異常放電を起こさず、トナー乱れが発生しない程度
に除電してやれば良い。転写紙８の完全な除電は、定着
ローラ１２通過後の排紙時に除電ブラシ（図示しない）
等で行えば良い。The transfer paper 8 that has passed through the transfer guide surface 9a is discharged by a gap discharge at a portion where the side surface portion 10a of the discharge brush 10 is exposed. In this case, it is not necessary to completely remove the charge of the transfer paper 8. When the transfer paper 8 is separated from the transfer paper guide member 9 or approaches the fixing entrance guide plate 11, abnormal discharge does not occur and toner disturbance does not occur. Should be removed. A complete neutralization of the transfer paper 8 is achieved by a neutralization brush (not shown) when the paper is discharged after passing through the fixing roller 12.
And so on.
【００１３】このように、除電ブラシ１０側面部１０ａ
で除電された後、除電が完全に行われていない転写紙８
は、転写紙案内面９ｂと静電吸着しながら搬送される。
これにより、除電後もバタツキの無い安定した搬送が行
われる。したがって、転写紙８の転写紙案内面９ｂから
の分離も均一に行われる。この転写紙８の除電に関して
は、転写ベルト２の分離部付近又は転写紙ガイド部材９
に除電ブラシを設け、除電ブラシの毛先を転写紙８に接
触若しくは近接させて行うことが一般的に考えられる。As described above, the side surface 10a of the static elimination brush 10
Transfer paper 8 that has not been completely neutralized after the static elimination
Is transported while being electrostatically attracted to the transfer paper guide surface 9b.
As a result, stable conveyance without flapping is performed even after static elimination. Therefore, the transfer paper 8 is also uniformly separated from the transfer paper guide surface 9b. Regarding the charge removal of the transfer paper 8, the vicinity of the separation portion of the transfer belt 2 or the transfer paper guide member 9
It is generally conceivable to provide a static elimination brush on the transfer paper 8 so that the tip of the brush is in contact with or close to the transfer paper 8.
【００１４】しかし、除電以前の転写紙８は、転写ベル
ト２における電気抵抗の局所的なバラツキ等により、帯
電状態が一様でなく、毛先で除電を行う場合は、過剰に
帯電した部分と毛先との集中的な放電により、毛先に沿
った異常画像が発生し易い。また、毛先よる除電は、除
電過多になり易く、上述したような静電吸着が困難にな
るので、転写紙ガイド部材９や、転写ベルト２からの分
離を不均一にさせ、異常画像の発生を引き起こし易い。
この実施例の転写紙ガイド部材９では、除電ブラシ１０
の毛先１０ｂを露出させないようにし、除電ブラシの側
面部１０ａを利用した除電を行っているので、このよう
な不具合を回避できる。However, the transfer paper 8 before static elimination has a non-uniform charging state due to local variations in the electric resistance of the transfer belt 2 and the like. Due to the intensive discharge with the hair tips, an abnormal image along the hair tips is likely to occur. Further, the charge removal by the bristle ends easily causes excessive charge removal, and the above-described electrostatic attraction becomes difficult. Therefore, the separation from the transfer paper guide member 9 and the transfer belt 2 becomes uneven, and an abnormal image is generated. Easy to cause.
In the transfer paper guide member 9 according to this embodiment, the discharging brush 10
Such a defect can be avoided because the brush tip 10b is not exposed and the charge is removed using the side surface 10a of the charge removing brush.
【００１５】ところで、転写紙ガイド部材９の形状につ
いては、上記実施例に限らず、図３に示すように、平坦
な転写紙ガイド部材９１上に、除電ブラシ１０を設置
し、マイラ１４等をガイド部材９１の平坦面及び除電ブ
ラシ１０に貼り付ける等して転写紙案内面１４ａ，１４
ｂを設けた構成にしても良い。この場合、マイラ１４の
材質を導電性にしても良い。By the way, the shape of the transfer paper guide member 9 is not limited to the above embodiment. As shown in FIG. 3, the neutralization brush 10 is installed on a flat transfer paper guide member 91 and the mylar 14 and the like are mounted. The transfer paper guide surfaces 14a, 14a are adhered to the flat surface of the guide member 91 and the static elimination brush 10, for example.
The structure provided with b may be adopted. In this case, the material of the mylar 14 may be conductive.
【００１６】また、転写紙ガイド部材９は、除電前後で
の転写紙８と転写紙案内面９ａ，９ｂとの静電吸着力を
高めるために、プラスチックで形成し、転写紙案内面９
ａ，９ｂ部分を金属蒸着膜で形成しても良い。また、転
写紙ガイド部材９自体を金属材料で構成すれば、転写紙
案内面９ａ，９ｂの平面度が出し易くなり、転写紙８の
分離を均一にできる。また、転写紙ガイド部材９の導電
性部分は、複写機本体の電気容量の大きい部材に接続し
ても良いが、導電性部分を接地するのが最も好ましい。
接地することにより、連続コピー時の転写紙ガイド部材
９への帯電が防止され、転写紙８の除電能力が維持され
る。The transfer paper guide member 9 is formed of plastic in order to increase the electrostatic attraction between the transfer paper 8 and the transfer paper guide surfaces 9a and 9b before and after static elimination.
The portions a and 9b may be formed of a metal deposition film. Further, if the transfer paper guide member 9 itself is made of a metal material, the transfer paper guide surfaces 9a and 9b can be easily flattened, and the transfer paper 8 can be separated uniformly. Further, the conductive portion of the transfer paper guide member 9 may be connected to a member having a large electric capacity of the copying machine main body, but it is most preferable that the conductive portion is grounded.
The grounding prevents the transfer paper guide member 9 from being charged during continuous copying, and maintains the charge removal ability of the transfer paper 8.
【００１７】さらに、異常画像の原因が、転写紙８が転
写ベルト２から分離する際に起きる放電である場合は、
図１に示すように、転写紙ガイド部材９の転写ベルト２
に近接する側の端部と転写ベルト２との距離Ｄを短く
し、放電を起こす前、または放電量が小さい内に、転写
紙８を転写紙案内面９ａへ到達させてやれば良い。しか
し、この時の転写ベルト２に近接する側の端部が導電性
材料で形成されていると、この端部と転写ベルト２との
間で放電が起きる場合があり、転写電流の正常な制御が
行えなくなる。また、この端部にバリや傷による微小な
突起があると、さらに異常放電を引き起こし易くなり、
異常画像の発生原因となる。Further, when the cause of the abnormal image is a discharge that occurs when the transfer paper 8 separates from the transfer belt 2,
As shown in FIG. 1, the transfer belt 2 of the transfer paper guide member 9
The transfer paper 8 may reach the transfer paper guide surface 9a before the discharge occurs or while the amount of discharge is small, by shortening the distance D between the end on the side close to the transfer belt 2 and the transfer belt 2. However, if the end near the transfer belt 2 at this time is formed of a conductive material, a discharge may occur between the end and the transfer belt 2 and normal control of the transfer current is performed. Cannot be performed. In addition, if there are minute projections due to burrs or scratches at this end, abnormal discharge is more likely to occur,
This may cause an abnormal image.
【００１８】したがって、転写紙ガイド部材９を転写ベ
ルト２にかなり接近して配置する場合は、転写ベルト２
側の端部は絶縁材料で形成するのが好ましく、転写紙ガ
イド部材９が図２に示したような形状で、転写紙ガイド
部材９自体が金属材料で構成されている場合は、図４に
示すように、転写ベルト２側の端部表面を絶縁材料１５
で被覆する必要がある。Therefore, when the transfer paper guide member 9 is arranged very close to the transfer belt 2, the transfer belt 2
When the transfer paper guide member 9 has the shape shown in FIG. 2 and the transfer paper guide member 9 itself is made of a metal material, the end on the side is preferably formed of an insulating material. As shown, the end surface on the transfer belt 2 side is made of an insulating material 15.
It is necessary to cover with.
【００１９】また、転写紙ガイド部材９が、図３に示し
たような形状の場合は、図５に示すように、転写ベルト
２側のマイラ１４’を絶縁材料にして、このマイラ１
４’を転写ベルト２側へ突き出すような形にして設置す
る。また、図１（及び図２）に示すように、転写紙案内
面９ａ，９ｂの途中に設けた除電ブラシ１０側面部１０
ａの露出ギャップＬは、１.０≦Ｌ≦３.０（mm）の範囲
が好適である。もし、Ｌが１.０mmより小さいと、除電
不足となり、除電ブラシ１０下流側にて異常放電が起こ
り、異常画像が発生し易くなる。一方、露出ギャップＬ
が３.０mmより大きいと、除電過多になり易く、搬送の
不安定さから、転写紙ガイド部材９からの分離が不均一
となり、異常画像と定着入り口でのジャムが発生し易く
なる。When the transfer paper guide member 9 has a shape as shown in FIG. 3, as shown in FIG. 5, the mylar 14 'on the side of the transfer belt 2 is made of an insulating material, and
4 ′ is set so as to protrude toward the transfer belt 2 side. Further, as shown in FIG. 1 (and FIG. 2), the side surface 10 of the neutralization brush 10 provided in the middle of the transfer paper guide surfaces 9a and 9b.
The exposure gap L of a is preferably in the range of 1.0 ≦ L ≦ 3.0 (mm). If L is smaller than 1.0 mm, the static elimination becomes insufficient, abnormal discharge occurs downstream of the static elimination brush 10, and an abnormal image easily occurs. On the other hand, the exposure gap L
Is larger than 3.0 mm, excessive static elimination is apt to occur, and the separation from the transfer paper guide member 9 becomes uneven due to the instability of conveyance, and an abnormal image and a jam at the fixing entrance easily occur.
【００２０】[0020]
【発明の効果】以上説明したように、請求項１によれ
ば、転写紙が分離する前記転写ベルトの後端部に近接し
て配置され、転写紙を案内する平坦面の転写紙案内面を
有し、この転写紙案内面の途中に、毛先が転写紙案内面
と同一面に露出しないように、その側面部は露出する形
で除電ブラシを配設した転写紙ガイド部材を備えたの
で、除電のための帯電器を配置する必要がなくなり、低
コスト化に寄与し、オゾンの発生を抑えることができ
る。また、定着付近でのジャム処理やメンテナンス時の
安全性が確保できる。また、転写紙案内面は平坦面であ
るので、従来、リブ状にしていた時に発生したリブに沿
った異常画像を防止することができる。また、除電後の
転写紙を転写紙案内面に吸着させることができ、除電後
もバタツキの無い安定した搬送を行なうことができる。
したがって、分離の不均一さによる異常画像を防止する
ことができる。さらに、除電ブラシの毛先を転写紙案内
面から露出していないので、転写紙の過剰帯電部との集
中的な放電が無くなり、毛先に沿ったスジ状の異常画像
が発生するのを防止することができる。As described above, according to the first aspect of the present invention, the transfer paper guide surface, which is a flat surface that is disposed close to the rear end of the transfer belt where the transfer paper separates and guides the transfer paper, is provided. Since the transfer paper guide surface is provided with a charge removing brush in the middle of the transfer paper guide surface so that the bristle tips are not exposed on the same surface as the transfer paper guide surface, the side surfaces thereof are provided. In addition, it is not necessary to dispose a charger for removing electricity, which contributes to cost reduction and suppresses generation of ozone. In addition, safety during jam clearance and maintenance near the fixing can be ensured. In addition, since the transfer paper guide surface is a flat surface, it is possible to prevent an abnormal image along the rib which has been generated when the transfer paper is conventionally formed into a rib shape. Further, the transfer paper after the charge elimination can be attracted to the transfer paper guide surface, so that even after the charge elimination, stable conveyance without flutter can be performed.
Therefore, an abnormal image due to non-uniform separation can be prevented. In addition, since the brush tip of the neutralizing brush is not exposed from the transfer paper guide surface, intensive discharge with the excessively charged portion of the transfer paper is eliminated, preventing the occurrence of streak-like abnormal images along the brush tip. can do.
【００２１】また、請求項２によれば、前記転写紙案内
面部分を導電性材料で形成したので、転写紙との静電吸
着力が高まり、安定した搬送を行うことができる。ま
た、請求項３によれば、前記転写紙ガイド部材を金属材
料で形成したので、平面度が出し易くなり、転写紙の分
離を均一にでき、分離の不均一さによる異常画像を防止
することができる。According to the second aspect of the present invention, since the transfer paper guide surface portion is formed of a conductive material, the electrostatic attraction with the transfer paper is increased, and stable conveyance can be performed. According to the third aspect of the present invention, since the transfer paper guide member is formed of a metal material, the flatness can be easily obtained, the transfer paper can be separated uniformly, and an abnormal image due to uneven separation can be prevented. Can be.
【００２２】また、請求項４によれば、前記転写紙ガイ
ド部材の導電性部分を接地したので、連続してコピーを
行った時に、転写紙ガイド部材が帯電し、転写紙の除電
能力が低下するのを防止することができる。また、請求
項５によれば、前記転写紙ガイド部材の前記転写ベルト
の近接する側の端部表面を絶縁材料で形成したので、転
写紙ガイド部材と転写ベルトとの放電を防止することが
できる。また、請求項６によれば、前記転写紙案内面の
途中に配設した、前記除電ブラシ側面部の露出部の幅を
Ｌとすると、１.０≦Ｌ≦３.０（mm）としたので、転写
紙の除電不足（Ｌ＜１.０mm）や除電過多（Ｌ＞３.０m
m）による異常画像の発生を防止することができる。According to the fourth aspect of the present invention, since the conductive portion of the transfer paper guide member is grounded, the transfer paper guide member is charged when continuous copying is performed, and the charge removal capability of the transfer paper is reduced. Can be prevented. According to the fifth aspect, since the end surface of the transfer paper guide member on the side close to the transfer belt is formed of an insulating material, discharge between the transfer paper guide member and the transfer belt can be prevented. . According to a sixth aspect of the present invention, when the width of the exposed portion of the side surface of the static elimination brush, which is disposed in the middle of the transfer paper guide surface, is L, it is 1.0 ≦ L ≦ 3.0 (mm). Therefore, the transfer paper is insufficiently neutralized (L <1.0 mm) or excessively neutralized (L> 3.0 m).
The occurrence of an abnormal image due to m) can be prevented.
【図１】この発明の実施例の転写ベルト装置を示す概略
構成図である。FIG. 1 is a schematic configuration diagram showing a transfer belt device according to an embodiment of the present invention.
【図２】転写紙ガイド部材の実施例を示す斜視図であ
る。FIG. 2 is a perspective view showing an embodiment of a transfer paper guide member.
【図３】転写紙ガイド部材の他の実施例を示す側面図で
ある。FIG. 3 is a side view showing another embodiment of the transfer paper guide member.
【図４】転写ベルト側を絶縁材料で被覆した転写紙ガイ
ド部材を示す側面図である。FIG. 4 is a side view showing a transfer paper guide member in which a transfer belt side is covered with an insulating material.
【図５】転写ベルト側に絶縁材料を突出させた転写紙ガ
イド部材を示す側面図である。FIG. 5 is a side view showing a transfer paper guide member having an insulating material protruding toward the transfer belt.
１ 像担持体 ２ 転写ベルト ８ 転写紙 ９，９１ 転写紙ガイド部材 ９ａ，９ｂ 転写紙案内面 １０ 除電ブラシ １４ 導電性材料 １５ 絶縁材料 DESCRIPTION OF SYMBOLS 1 Image carrier 2 Transfer belt 8 Transfer paper 9, 91 Transfer paper guide member 9a, 9b Transfer paper guide surface 10 Static removal brush 14 Conductive material 15 Insulating material
───────────────────────────────────────────────────── フロントページの続き 審査官 竹村 真一郎 (56)参考文献 特開 平６−124791（ＪＰ，Ａ) 特開 平６−56301（ＪＰ，Ａ) 特開 平５−45952（ＪＰ，Ａ) 特開 平２−91671（ＪＰ，Ａ) 特開 平６−138776（ＪＰ，Ａ) 特開 平５−165342（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 15/14 G03G 15/16 ──────────────────────────────────────────────────続 き Continuing from the front page Examiner Shinichiro Takemura (56) References JP-A-6-124791 (JP, A) JP-A-6-56301 (JP, A) JP-A-5-49552 (JP, A) JP-A-2-91671 (JP, A) JP-A-6-138776 (JP, A) JP-A-5-165342 (JP, A) (58) Fields studied (Int. Cl. 7 , DB name) G03G 15 / 14 G03G 15/16
Claims (6)
た転写ベルトを有し、像担持体上のトナー画像を転写紙
上に転写する転写ベルト装置において、 転写紙が分離する前記転写ベルトの後端部に近接して配
置され、転写紙を案内する平坦面の転写紙案内面を有
し、この転写紙案内面の途中に、毛先を転写紙案内面と
同一面に露出させないように、その側面を露出した形で
除電ブラシを配設した転写紙ガイド部材を備えたことを
特徴とする転写ベルト装置。1. A transfer belt device for transferring a toner image on an image carrier onto transfer paper, the transfer belt having a transfer belt formed of a material having a medium electrical resistance, wherein the transfer belt separates the transfer paper. It has a flat transfer paper guide surface that is arranged close to the rear end and guides the transfer paper. In the middle of the transfer paper guide surface, the bristle tips are not exposed on the same plane as the transfer paper guide surface. And a transfer paper guide member provided with a static elimination brush with its side exposed.
したことを特徴とする請求項１記載の転写ベルト装置2. The transfer belt device according to claim 1, wherein the transfer paper guide surface portion is formed of a conductive material.
たことを特徴とする請求項１記載の転写ベルト装置。3. The transfer belt device according to claim 1, wherein said transfer paper guide member is formed of a metal material.
したことを特徴とする請求項２又は請求項３記載の転写
ベルト装置。4. The transfer belt device according to claim 2, wherein a conductive portion of the transfer paper guide member is grounded.
近接する側の端部表面を絶縁材料で形成したことを特徴
とする請求項４記載の転写ベルト装置。5. The transfer belt device according to claim 4, wherein the end surface of the transfer paper guide member on the side close to the transfer belt is formed of an insulating material.
除電ブラシ側面の露出幅をＬとすると、１.０≦Ｌ≦３.
０（mm）としたことを特徴とする請求項１記載の転写ベ
ルト装置。6. An exposure width of a side surface of the charge removing brush disposed in the middle of the transfer paper guide surface, where L is 1.0 ≦ L ≦ 3.0.
The transfer belt device according to claim 1, wherein the transfer belt device is set to 0 (mm).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05154994A JP3330721B2 (en) | 1994-03-23 | 1994-03-23 | Transfer belt device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05154994A JP3330721B2 (en) | 1994-03-23 | 1994-03-23 | Transfer belt device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07261562A JPH07261562A (en) | 1995-10-13 |
| JP3330721B2 true JP3330721B2 (en) | 2002-09-30 |
Family
ID=12890104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05154994A Expired - Lifetime JP3330721B2 (en) | 1994-03-23 | 1994-03-23 | Transfer belt device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3330721B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3973810B2 (en) | 1999-10-29 | 2007-09-12 | 株式会社リコー | Transfer device and image forming device |
| JP4666585B2 (en) * | 2005-02-14 | 2011-04-06 | 京セラミタ株式会社 | Image forming apparatus |
| JP6127461B2 (en) | 2012-03-14 | 2017-05-17 | ブラザー工業株式会社 | Image forming apparatus |
| JP5953859B2 (en) * | 2012-03-22 | 2016-07-20 | 株式会社リコー | Transfer device and image forming apparatus |
-
1994
- 1994-03-23 JP JP05154994A patent/JP3330721B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07261562A (en) | 1995-10-13 |
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