JPH06317990A - Belt transfer device - Google Patents
Belt transfer deviceInfo
- Publication number
- JPH06317990A JPH06317990A JP10661493A JP10661493A JPH06317990A JP H06317990 A JPH06317990 A JP H06317990A JP 10661493 A JP10661493 A JP 10661493A JP 10661493 A JP10661493 A JP 10661493A JP H06317990 A JPH06317990 A JP H06317990A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- belt
- transfer paper
- paper guide
- 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.)
- Granted
Links
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はベルト転写装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt transfer device.
【０００２】[0002]
【従来の技術】電子複写機や光プリンター等の画像形成
装置では一般に、光導電性の感光体上に静電線像を形成
し、この静電線像を現像して得られるトナー画像を転写
紙上に転写・定着して所望の画像を得る。2. Description of the Related Art Generally, in an image forming apparatus such as an electronic copying machine or an optical printer, a toner image obtained by forming an electrostatic line image on a photoconductive photoconductor and developing the electrostatic line image is formed on a transfer paper. Transfer and fix to obtain desired image.
【０００３】トナー画像を感光体上から転写紙上に転写
する転写方式には種々のものがあるが、その一つとし
て、転写ベルトにより転写紙を搬送しつつ感光体表面に
接触させて転写を行う「ベルト転写方式」が知られてい
る。There are various transfer methods for transferring a toner image from a photoconductor onto a transfer paper. One of them is to transfer the transfer paper by a transfer belt while bringing the transfer paper into contact with the surface of the photoconductor. The "belt transfer method" is known.
【０００４】ベルト転写方式では、トナー画像を転写さ
れた転写紙が転写ベルトから分離するとき「転写紙の除
電」が行われる。この除電は、従来、コロナ除電器を用
いて行われていた（特開平３−２３１７８３号公報）。In the belt transfer system, when the transfer paper on which the toner image has been transferred is separated from the transfer belt, "static elimination of the transfer paper" is performed. This static elimination has conventionally been performed using a corona static eliminator (Japanese Patent Laid-Open No. 3-231783).
【０００５】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、コロナ除電器の配備される部位は転写
ベルトと定着装置との間であり、定着装置では、ともす
れば転写紙の搬送不全が生じ易い。定着装置で転写紙の
搬送不全が発生すると、手作業でジャムした転写紙を取
り除く必要があるが、転写紙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あることはメンテナンス
作業の安全性の上から好ましくない。The charge removal by the corona charge eliminator is excellent in charge removal effect. However, the part where the corona charge eliminator is provided is between the transfer belt and the fixing device. It is easy to occur. When transfer paper conveyance failure occurs in the fixing device, it is necessary to manually remove the jammed transfer paper.However, it is a maintenance work that there is a high voltage applied member near the transfer paper such as a corona discharger. It is not preferable in terms of safety.
【０００６】[0006]
【発明が解決しようとする課題】この発明は上述した事
情に鑑みてなされたものであって、コロナ除電器を必要
とせず、簡単な構成で確実に転写紙の除電を行うことの
できる新規なベルト転写装置の提供を目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is a novel device that does not require a corona charge eliminator and can surely remove charge from a transfer sheet with a simple structure. A belt transfer device is provided.
【０００７】[0007]
【課題を解決するための手段】この発明のベルト転写装
置は「電気抵抗が中抵抗である材質により形成された転
写ベルトを用い、感光体上のトナー画像を転写紙上に転
写する」装置であり、転写紙ガイド部材を有する。転写
紙ガイド部材」は、トナー画像を転写された転写紙が転
写ベルトから分離する側に設けられ、転写ベルトから分
離した転写紙を定着部側へ案内する。転写紙ガイド部材
の転写紙案内面は平面であり、少なくとも転写紙案内面
部分は導電性材料により形成される（請求項１）。A belt transfer device according to the present invention is a device for "transferring a toner image on a photoconductor onto a transfer paper by using a transfer belt formed of a material whose electric resistance is medium resistance". , A transfer paper guide member. The “transfer paper guide member” is provided on the side where the transfer paper on which the toner image has been transferred is separated from the transfer belt, and guides the transfer paper separated from the transfer belt to the fixing unit side. The transfer paper guide surface of the transfer paper guide member is a flat surface, and at least the transfer paper guide surface portion is formed of a conductive material (claim 1).
【０００８】転写紙ガイド部材は、例えば、これをプラ
スチックにより形成し、転写紙案内面部分を金属蒸着膜
で形成するなどして転写紙案内面部分を導電性としても
よいが、転写紙ガイド部材自体を金属材料で構成するこ
とができる（請求項２）。The transfer paper guide member may be made conductive, for example, by forming the transfer paper guide member by a plastic and forming the transfer paper guide surface by a metal vapor deposition film. It itself can be made of a metallic material (claim 2).
【０００９】また、転写紙ガイド部材の導電性部分は、
画像形成装置本体の電気容量の大きい部材に接続しても
良いが、上記導電性部分を接地するのが最も好ましい
（請求項３）。The conductive portion of the transfer paper guide member is
Although it may be connected to a member having a large electric capacity of the image forming apparatus main body, it is most preferable to ground the conductive portion (claim 3).
【００１０】また、転写紙ガイド部材と転写ベルトとの
位置的関係は、転写紙が「転写ベルトから分離しつつ、
転写紙ガイド部材によりスムーズに案内される」ように
定められることが必要であることは言うまでもないが、
転写紙ガイド部材の転写ベルトに近接する側の端部と転
写ベルトとの間隙：Ｄは０≦Ｄ≦３ｍｍの範囲が好適で
あり（請求項４）、転写紙ガイド部材の転写ベルトに近
接する側の端部側表面と、転写ベルトの上部平面部分と
の段差：Ｌは１≦Ｌ≦３ｍｍの範囲が好適である（請求
項６）。ここに「転写ベルトの上部平面部分」とは、転
写ベルトが平面的に張られた部分のうち、上方にある部
分、即ち転写紙を保持搬送する側の平面状部分を言う。The positional relationship between the transfer paper guide member and the transfer belt is that the transfer paper is "separated from the transfer belt,
Needless to say, it is necessary to be stipulated that "the transfer paper guide member smoothly guides".
The gap D between the end of the transfer paper guide member on the side close to the transfer belt and the transfer belt is preferably in the range of 0 ≦ D ≦ 3 mm (Claim 4), and is close to the transfer belt of the transfer paper guide member. It is preferable that the step difference L between the surface on the side of the end and the flat surface of the upper portion of the transfer belt is in the range of 1 ≦ L ≦ 3 mm (claim 6). Here, the “upper plane portion of the transfer belt” refers to an upper portion of the portion where the transfer belt is stretched in a plane, that is, a flat portion on the side for holding and conveying the transfer paper.
【００１１】さらに、転写紙ガイド部材の「転写ベルト
に近接する側の端部近傍」の表面性は、中仕上げ以上と
することが望ましい（請求項５）。Further, it is desirable that the surface property of "the vicinity of the end portion on the side close to the transfer belt" of the transfer paper guide member is not less than medium finish (claim 5).
【００１２】また、転写ベルトの線速：ＶBが、定着ロ
ーラーの線速：ＶTよりも大きく設定される場合には、
「定着ローラーのニップ部と、転写ベルトの上部平面部
分の転写紙が分離する側の端部とを結ぶ直線に対し、転
写紙ガイド部材の転写紙案内面が、転写ベルトから離れ
るに従い上記直線から下方へ離れるように傾斜する」よ
うにする（請求項７）。When the linear velocity of the transfer belt: V B is set higher than the linear velocity of the fixing roller: V T ,
“For the straight line connecting the nip portion of the fixing roller and the end of the upper flat surface of the transfer belt on the side where the transfer paper is separated, the transfer paper guide surface of the transfer paper guide member moves from the above straight line as the distance from the transfer belt increases. It is inclined downwardly ”(Claim 7).
【００１３】転写紙ガイド部材により案内される転写紙
が転写紙ガイド部材から離れる部位には、除電ブラシを
設け、その穂先が転写紙裏面側に接触するようにするこ
とができ（請求項８）、この場合、転写紙ガイド部材の
転写紙案内面からの除電ブラシの穂先の突出量：Ｋは、
０≦Ｋ≦２ｍｍの範囲が好適である（請求項９）。A static eliminator brush may be provided at a portion where the transfer paper guided by the transfer paper guide member separates from the transfer paper guide member so that the tip of the brush contacts the back surface of the transfer paper. In this case, the protrusion amount of the tip of the static elimination brush from the transfer paper guide surface of the transfer paper guide member: K is
The range of 0 ≦ K ≦ 2 mm is preferable (claim 9).
【００１４】[0014]
【作用】この発明では、転写ベルトから分離した転写紙
は、その裏面側を転写紙ガイド部材の転写紙案内面に接
しつつ定着部側へ案内される。転写紙ガイド部材の転写
紙案内面は平面に形成され導電性であり、転写紙はその
裏面が転写紙案内面に面接触することにより除電され
る。According to the present invention, the transfer sheet separated from the transfer belt is guided to the fixing section side while its back side is in contact with the transfer sheet guide surface of the transfer sheet guide member. The transfer paper guide surface of the transfer paper guide member is formed into a flat surface and is electrically conductive, and the transfer paper is neutralized when its back surface comes into surface contact with the transfer paper guide surface.
【００１５】[0015]
【実施例】以下、具体的な実施例に即して説明する。図
１は、この発明のベルト転写装置の１実施例を説明する
ための図である。図１（ａ）において、符号１０で示す
光導電性の感光体はドラム状に形成され、転写されるべ
きトナー画像を周面に保持して矢印方向へ回転する。符
号１２で示す転写ベルトは、電気抵抗が中抵抗であるゴ
ム材料で形成され、駆動ローラー１４と従動ローラー１
６とに巻装され、駆動ローラー１４により反時計回りに
回転駆動される。EXAMPLES Hereinafter, description will be given in accordance with specific examples. FIG. 1 is a diagram for explaining one embodiment of a belt transfer device of the present invention. In FIG. 1A, a photoconductive photoconductor indicated by reference numeral 10 is formed in a drum shape, holds a toner image to be transferred on its peripheral surface, and rotates in the arrow direction. The transfer belt indicated by reference numeral 12 is formed of a rubber material having an electric resistance of medium resistance, and includes a driving roller 14 and a driven roller 1.
6, and is driven to rotate counterclockwise by the drive roller 14.
【００１６】駆動ローラー１４は金属ローラーの外周面
に、転写ベルト１２との摩擦係合を高めるためのゴム層
を形成され、図示されない駆動機構により反時計回りに
回転駆動される。従動ローラー１６は金属ローラーであ
る。The drive roller 14 has a rubber layer formed on the outer peripheral surface of the metal roller for enhancing frictional engagement with the transfer belt 12, and is rotationally driven counterclockwise by a drive mechanism (not shown). The driven roller 16 is a metal roller.
【００１７】符号１８で示す印加ローラーは金属ローラ
ーであって、感光体１０と転写ベルト１２との接触部か
ら駆動ローラー１４側へ「所定の距離ずれた」位置にお
いて転写ベルト１２の内周面に当接し、転写ベルト１２
の回転に従動して回転する。符号２０で示すフィードバ
ック板は金属板であって、印加ローラー１８と駆動ロー
ラー１４との間で転写ベルト１２の内周面に接触してい
る。印加ローラー１８およびフィードバック板２０は共
に電源２２に接続されている。The application roller indicated by the reference numeral 18 is a metal roller, and is applied to the inner peripheral surface of the transfer belt 12 at a position "shifted by a predetermined distance" from the contact portion between the photoconductor 10 and the transfer belt 12 toward the drive roller 14. Abut and transfer belt 12
Rotates following the rotation of. The feedback plate denoted by reference numeral 20 is a metal plate, and is in contact with the inner peripheral surface of the transfer belt 12 between the applying roller 18 and the driving roller 14. Both the application roller 18 and the feedback plate 20 are connected to the power supply 22.
【００１８】トナー画像転写時には、反時計方向へ回転
する転写ベルト１２の従動ローラー１６側から転写紙Ｓ
が配紙される。転写紙Ｓは転写ベルト１２の上部平面部
の右側端部に乗り上げ、転写ベルト１２の回転に伴い左
方へ搬送され、転写部において感光体１０の周面に接触
する。このとき、電源２２から印加ローラー１８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１２を右方へ流れて転写電流となり、感光体１０上
のトナー画像を転写紙Ｓ上に転写する。印加電流の残り
の部分Ｉ2は、転写ベルト１２を左方へ流れ、フィード
バック板２０から電源２２へ戻る。During transfer of the toner image, the transfer paper S is transferred from the side of the driven roller 16 of the transfer belt 12 rotating counterclockwise.
Is distributed. The transfer sheet S rides on the right end of the upper flat surface of the transfer belt 12, is conveyed leftward as the transfer belt 12 rotates, and contacts the peripheral surface of the photoconductor 10 at the transfer section. At this time, the current I 1 is applied from the power source 22 to the application roller 18. Part of the applied current I 1 flows to the right on the transfer belt 12 to become a transfer current, and the toner image on the photoconductor 10 is transferred onto the transfer paper S. The remaining portion I 2 of the applied current flows to the left on the transfer belt 12 and returns from the feedback plate 20 to the power supply 22.
【００１９】このようにして感光体１０上のトナー画像
は転写紙Ｓ上に転写されるが、この転写の際に転写紙Ｓ
は不可避的に帯電する。トナー画像を転写された転写紙
Ｓは転写ベルト１２の回転に伴い、図の左方へ搬送さ
れ、転写紙ガイド部材３０により案内されつつ除電さ
れ、除電ブラシ４０により更に除電されたのち、ガイド
５２により定着部へ案内される。定着部は定着ローラー
５０のニップ部であり、転写紙Ｓは、この定着部を通過
する際にトナー画像を定着される。In this way, the toner image on the photoconductor 10 is transferred onto the transfer paper S. At the time of this transfer, the transfer paper S is transferred.
Is inevitably charged. The transfer sheet S on which the toner image has been transferred is conveyed to the left side of the drawing as the transfer belt 12 rotates, and is discharged while being guided by the transfer sheet guide member 30 and further discharged by the charge removing brush 40, and then the guide 52. Will guide you to the fixing section. The fixing portion is a nip portion of the fixing roller 50, and the transfer sheet S is fixed with the toner image when passing through the fixing portion.
【００２０】転写紙ガイド部材３０は、図１（ｂ）に示
すように、金属板を３部分３１，３２ａ，３２ｂに折り
曲げられた形状を有しており、図１（ａ）に示すように
接地されている。転写紙ガイド部材３０の、符号３１で
示す部分は基部、３２ａ，３２ｂで示す部分は転写紙案
内面である。「転写紙案内面が平面である」とは、転写
紙案内面３２ａおよび３２ｂが、それぞれ平面であると
いう意味である。As shown in FIG. 1 (b), the transfer paper guide member 30 has a shape in which a metal plate is bent into three parts 31, 32a, 32b, and as shown in FIG. 1 (a). It is grounded. In the transfer paper guide member 30, portions indicated by reference numeral 31 are base portions, and portions indicated by 32a and 32b are transfer paper guide surfaces. The phrase "the transfer paper guide surface is a flat surface" means that the transfer paper guide surfaces 32a and 32b are flat surfaces.
【００２１】トナー画像を転写された転写紙Ｓは、転写
ベルト１２が駆動ローラー１４に巻きつく部分まで搬送
されてくると、自身の腰の強さにより転写ベルト１２か
ら分離し、転写紙案内面３２ａの上に乗り、さらに転写
紙案内面３２ｂの上を案内される。このとき転写紙Ｓの
裏面は転写紙案内面３２ａ，３２ｂと面積的に接触し、
除電される。When the transfer belt 12 is conveyed to the portion where the transfer belt 12 is wound around the drive roller 14, the transfer sheet S on which the toner image is transferred is separated from the transfer belt 12 by the strength of its own waist, and the transfer sheet guide surface is formed. It rides on 32a and is guided on the transfer paper guide surface 32b. At this time, the back surface of the transfer sheet S comes into area contact with the transfer sheet guide surfaces 32a and 32b,
The electricity is removed.
【００２２】除電以前の転写紙Ｓは、転写ベルト１２に
おける電気抵抗の局所的な「ばらつき」により、帯電状
態が一様でなく、この不均一な帯電状態を放置すると、
転写紙が導電性の部材に接触したりする際に転写紙Ｓ内
で電荷の急激な移動が発生してトナー画像に乱れが生じ
ることがるが、上記のようにして除電を行うことによ
り、このような問題を有効に回避することができる。The transfer sheet S before the static elimination has a non-uniform charging state due to local "variation" in the electric resistance of the transfer belt 12. If this non-uniform charging state is left,
When the transfer paper comes into contact with a conductive member, a rapid movement of electric charges may occur in the transfer paper S to disturb the toner image. However, by performing the charge removal as described above, Such a problem can be effectively avoided.
【００２３】転写紙Ｓと転写紙ガイド部材３０の転写紙
案内面３２ａ，３２ｂとの接触は面積的であるため、除
電の際に、転写紙上の電荷が急激に移動してトナー画像
を乱すことはない。Since the contact between the transfer paper S and the transfer paper guide surfaces 32a and 32b of the transfer paper guide member 30 is area-wise, the charge on the transfer paper abruptly moves and disturbs the toner image during static elimination. There is no.
【００２４】図１（ａ）に符号Ｄをもって示す「転写紙
ガイド部材３０の転写ベルト１２に近接する側の端部
（転写紙案内面３２ａの転写ベルト１２側端部）と転写
ベルト１２との間隙」は、０〜３ｍｍの範囲に設定され
る（請求項４）。In FIG. 1A, reference numeral D indicates "the end of the transfer paper guide member 30 close to the transfer belt 12 (the end of the transfer paper guide surface 32a on the transfer belt 12 side) and the transfer belt 12. The "gap" is set in the range of 0 to 3 mm (claim 4).
【００２５】上記間隙：Ｄの大きさが３ｍｍを超えて大
きくなると、転写ベルト１２から分離した転写紙Ｓの先
端部と転写紙案内面３２ａの端部とが線接触的に近接
し、近接部に強い電解が発生し、転写紙上の電荷が放電
により急激に動いてトナー画像を乱す虞れがある。When the size of the above-mentioned gap: D exceeds 3 mm, the leading end of the transfer paper S separated from the transfer belt 12 and the end of the transfer paper guide surface 32a come close to each other in a line contact manner, and the approaching portion. There is a risk that strong electrolysis will occur, and the charge on the transfer paper will move abruptly due to discharge and disturb the toner image.
【００２６】また図１（ｃ）に符号３２０で示す「転写
紙ガイド部材３０の転写ベルト１２に近接する側の端部
近傍」の表面性は「中仕上げ以上」に仕上げられている
（請求項５）。この部分に所謂「ばり」や傷による微小
な突起があると、転写紙Ｓがこの突起に近接したとき
に、転写紙Ｓの電荷が上記突起に異状放電してトナー画
像を乱す虞れがあるからである。Further, the surface property of "in the vicinity of the end of the transfer paper guide member 30 on the side close to the transfer belt 12" shown by reference numeral 320 in FIG. 5). If there is a minute protrusion due to so-called "burrs" or scratches in this portion, when the transfer sheet S approaches the protrusion, the charge of the transfer sheet S may be abnormally discharged to the protrusion and disturb the toner image. Because.
【００２７】さらに、図１（ａ）に符号Ｌで示された
「転写紙ガイド部材３０の転写ベルト１２に近接する側
の端部側表面（転写紙案内面３２ａ）と、転写ベルト１
２の上部平面部分との段差」は１〜５ｍｍの範囲に設定
される（請求項６）。Further, "the end surface of the transfer paper guide member 30 near the transfer belt 12 (transfer paper guide surface 32a)" indicated by reference character L in FIG.
The "step difference from the upper flat surface portion of 2" is set in the range of 1 to 5 mm (claim 6).
【００２８】上記段差：Ｌが１ｍｍよりも小さいと、転
写ベルト１２から分離する転写紙先端部が転写紙ガイド
部材３０の下へ潜り込んでジャム状態となる虞れがあ
る。また段差：Ｌが５ｍｍを超えて大きくなると、転写
ベルト１２から分離する転写紙Ｓと転写紙ガイド部材３
０の転写紙案内面３２ａ，３２ｂとの面積的な接触が確
保されなくなり除電の効果が保証されなくなる。If the step difference L is smaller than 1 mm, the leading edge of the transfer paper separating from the transfer belt 12 may slip under the transfer paper guide member 30 and become jammed. When the step difference L becomes larger than 5 mm, the transfer sheet S and the transfer sheet guide member 3 which are separated from the transfer belt 12 are separated.
Area contact with the transfer paper guide surfaces 32a and 32b of 0 is not secured, and the effect of static elimination cannot be guaranteed.
【００２９】尤も、上記段差：Ｌを５ｍｍより大きくし
た場合でも、「転写紙案内面３２ａ，３２ｂを同一平面
状として、これを転写ベルト１２の上部平面上部分と略
平行にし、且つ転写紙案内面の転写紙案内方向の幅を十
分に大きくとれば」確実な除電を行うことができる。However, even when the step difference L is made larger than 5 mm, "the transfer paper guide surfaces 32a and 32b are formed in the same plane and are made substantially parallel to the upper plane portion of the transfer belt 12, and the transfer paper guide surface is formed. If the width of the surface in the guide direction of the transfer paper is made sufficiently large, "reliable charge removal can be performed.
【００３０】また、この実施例に於ては、転写紙ガイド
部材３０の基部３１の部分に除電ブラシ４０が設けら
れ、その穂先が転写紙Ｓの裏面に接触可能な状態で配置
されている（請求項８）。除電ブラシ４０は導電性で、
転写紙ガイド部材３０を通じて接地されている。Further, in this embodiment, the static eliminating brush 40 is provided at the base 31 of the transfer paper guide member 30, and the tip of the brush is arranged so as to be in contact with the back surface of the transfer paper S ( Claim 8). The static elimination brush 40 is conductive,
It is grounded through the transfer paper guide member 30.
【００３１】除電ブラシ４０を用いることにより転写紙
Ｓの除電を有効に助長できる。除電ブラシ４０の穂先
は、図１（ｄ）に示すように、転写紙案内面３２ｂか
ら、突出量：Ｋだけ突出している。この突出量：Ｋは２
ｍｍ以下が良い（請求項９）。突出量：Ｋが２ｍｍより
大きくなると、穂先の弾性により転写紙が振動し、トナ
ー画像が乱れる虞れがあるからである。By using the static elimination brush 40, static elimination of the transfer paper S can be effectively promoted. As shown in FIG. 1D, the tip of the static elimination brush 40 protrudes from the transfer paper guide surface 32b by the protrusion amount K. This protrusion amount: K is 2
mm or less is preferable (Claim 9). This is because when the protrusion amount: K is larger than 2 mm, the transfer paper vibrates due to the elasticity of the tips, and the toner image may be disturbed.
【００３２】転写紙ガイド部材の転写紙案内面と転写紙
との接触面積を十分に取れば、転写紙ガイド部材のみで
転写紙を完全に除電することができる。従って、そのよ
うな場合は除電ブラシは不要である。しかし、除電ブラ
シを補助的に用いて転写紙の除電を助長することによ
り、転写紙ガイド部材の転写紙案内面の「転写紙案内方
向の長さ」を有効に短縮でき、除電部をコンパクト化す
ることが可能になる。If the contact area between the transfer paper guide surface of the transfer paper guide member and the transfer paper is sufficient, the transfer paper can be completely discharged by only the transfer paper guide member. Therefore, in such a case, the static elimination brush is unnecessary. However, by assisting the static elimination of the transfer paper by using the static elimination brush as an auxiliary, the "length in the transfer paper guiding direction" of the transfer paper guide surface of the transfer paper guide member can be effectively shortened, and the static elimination unit is made compact. It becomes possible to do.
【００３３】さて、この実施例においては転写ベルト１
２の線速：ＶBが定着ローラー５０の線速：ＶTよりも大
きく設定されている。転写ベルト１２の線速：ＶBと定
着ローラーの線速：ＶTとは「原理的には同速度でよ
い」が、これらを完全に同速度に制御するのは必ずしも
容易でない。Now, in this embodiment, the transfer belt 1
2 of linear velocity: linear velocity V B fixing roller 50: is set to be greater than V T. Linear speed of the transfer belt 12: a linear velocity of V B and the fixing roller: the V T is "in principle may be the same speed", it is not always easy to control in the speed of these completely.
【００３４】転写紙Ｓのサイズが長いと、「転写紙先端
部が定着ローラー５０に挾持されて定着搬送されている
状態で、転写紙後端部側は未だに転写部でトナー画像を
転写されている」ような場合があり、このような場合
に、定着ローラー５０の線速：ＶTが転写ベルト１２の
線速：ＶBよりも大きくなる事態が生ずると、定着部に
おける搬送力により転写紙Ｓが引っ張られ、転写部でト
ナー画像が「縮んだ状態」で転写されることになる。When the size of the transfer paper S is long, "a toner image is still transferred at the transfer portion on the rear end side of the transfer paper while the front end of the transfer paper is being held by the fixing roller 50 and being fixed and conveyed. When the linear velocity V T of the fixing roller 50 becomes higher than the linear velocity V B of the transfer belt 12 in such a case, the transfer paper in the fixing unit is transferred by the transfer force. S is pulled, and the toner image is transferred in a “shrinked state” at the transfer portion.
【００３５】このような事態を避けるためには、この実
施例のように転写ベルト１２の線速：ＶBを定着ローラ
ー５０の線速：ＶTよりも大きく設定するのがよい。こ
のようにすると、転写ベルト１２と定着ローラー５０と
により搬送される転写紙Ｓには、転写ベルト１２と定着
ローラー５０との間で「弛み」が発生することになり、
この弛みを吸収するスペースが必要となる。In order to avoid such a situation, it is preferable to set the linear velocity: V B of the transfer belt 12 higher than the linear velocity: V T of the fixing roller 50 as in this embodiment. In this way, "slack" is generated between the transfer belt 12 and the fixing roller 50 on the transfer sheet S conveyed by the transfer belt 12 and the fixing roller 50.
A space is required to absorb this slack.
【００３６】図１の実施例では、この弛みを吸収するた
めのスペースを、転写紙ガイド部材３０とガイド５２と
により形成している。即ち、「定着ローラー５０のニッ
プ部と、転写ベルト１２の上部平面部分の転写紙が分離
する側の端部とを結ぶ直線１００（２点鎖線で示す）に
対し、転写紙ガイド部材３０の転写紙案内面３２ｂが、
転写ベルト１２から離れるに従い、上記直線１００から
下方へ離れるように傾斜している」のである。このよう
にして、転写紙ガイド部材３０とガイド５２とにより直
線１００の下部に形成されたスペースにより、転写紙Ｓ
の弛みを吸収することができる。In the embodiment shown in FIG. 1, a space for absorbing this slack is formed by the transfer paper guide member 30 and the guide 52. That is, “transfer of the transfer paper guide member 30 to a straight line 100 (indicated by a chain double-dashed line) connecting the nip portion of the fixing roller 50 and the end of the transfer belt 12 on the side where the transfer paper is separated. The paper guide surface 32b
As the distance from the transfer belt 12 increases, the inclination is so as to move downward from the straight line 100 ". In this manner, the space formed under the straight line 100 by the transfer paper guide member 30 and the guide 52 allows the transfer paper S
It can absorb the slack.
【００３７】図２を参照すると、転写紙ガイド部材３０
の転写紙案内面を実線のようにせずに、破線で示すよう
に直線１００と略平行にしても、転写紙Ｓの腰が弱い場
合には問題がないが、図に示す転写紙Ｓのように腰の強
い転写紙を用いた場合には、破線で示す転写紙ガイド部
材とガイド５１との間のスペースに転写紙が十分に入り
込むことができず、図示のように「弛み」による変形
で、転写紙Ｓが転写ベルト１２から、本来の分離位置よ
りも転写位置側（図の右側）で分離してしまい、転写紙
と転写紙案内面との接触が十分に行われず除電不良が生
じるのである。しかるに図１に示す実施例では、このよ
うな問題の発生がない。Referring to FIG. 2, the transfer paper guide member 30.
Even if the transfer paper guiding surface is not made to be a solid line but is made substantially parallel to the straight line 100 as shown by a broken line, there is no problem if the transfer paper S has a weak stiffness, but When a transfer paper having a strong rigidity is used for the transfer paper, the transfer paper cannot sufficiently enter the space between the transfer paper guide member and the guide 51 indicated by the broken line, and the transfer paper is deformed by "slack" as shown in the figure. Since the transfer paper S is separated from the transfer belt 12 on the transfer position side (right side in the drawing) with respect to the original separation position, the transfer paper and the transfer paper guide surface are not sufficiently contacted with each other, and a charge removal failure occurs. is there. However, in the embodiment shown in FIG. 1, such a problem does not occur.
【００３８】[0038]
【発明の効果】以上のように、この発明によれば新規な
ベルト転写装置を提供できる。この発明は上記の如き構
成となっているから、除電手段としてコロナ除電器を必
要とせず、簡単な構成で転写紙を確実に除電することが
できる。As described above, according to the present invention, a novel belt transfer device can be provided. Since the present invention has the above-described configuration, it does not require a corona charge eliminator as a charge eliminator, and the transfer paper can be reliably neutralized with a simple structure.
【図１】この発明の１実施例を説明するための図であ
る。FIG. 1 is a diagram for explaining one embodiment of the present invention.
【図２】請求項６記載の発明の効果を説明するための図
である。FIG. 2 is a diagram for explaining an effect of the invention according to claim 6;
１０ 感光体 １２ 転写ベルト ３０ 転写紙ガイド部材 ３２ａ，３２ｂ 転写紙案内面 10 Photoconductor 12 Transfer Belt 30 Transfer Paper Guide Member 32a, 32b Transfer Paper Guide Surface
───────────────────────────────────────────────────── フロントページの続き (72)発明者 原沢 祐子 東京都大田区中馬込１丁目３番６号・株式 会社リコー内 (72)発明者 石井 宏一 東京都大田区中馬込１丁目３番６号・株式 会社リコー内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuko Harazawa, 1-3-3 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (72) Koichi Ishii, 1-3-6 Nakamagome, Ota-ku, Tokyo・ Inside Ricoh Co., Ltd.
Claims (9)
れた転写ベルトを用い、感光体上のトナー画像を転写紙
上に転写する装置であって、 転写紙が転写ベルトから分離する側に設けられて、分離
した転写紙を案内する転写紙ガイド部材の転写紙案内面
を平面とし、少なくとも上記転写紙案内面部分を導電性
材料により形成したことを特徴とするベルト転写装置。1. An apparatus for transferring a toner image on a photoconductor onto a transfer sheet by using a transfer belt formed of a material having an electric resistance of medium resistance, the apparatus being provided on a side where the transfer sheet is separated from the transfer belt. The transfer sheet guide surface of the transfer sheet guide member for guiding the separated transfer sheet is a flat surface, and at least the transfer sheet guide surface portion is formed of a conductive material.
るベルト転写装置。2. The belt transfer device according to claim 1, wherein the transfer paper guide member is made of a metal material.
おいて、 転写紙ガイド部材の導電性部分を接地したことを特徴と
するベルト転写装置。3. The belt transfer device according to claim 1, wherein a conductive portion of the transfer paper guide member is grounded.
写装置において、 転写紙ガイド部材の転写ベルトに近接する側の端部と転
写ベルトとの間隙：Ｄを０≦Ｄ≦３ｍｍとしたことを特
徴とするベルト転写装置。4. The belt transfer device according to claim 1, 2 or 3, wherein the gap D between the end of the transfer paper guide member on the side close to the transfer belt and the transfer belt is 0 ≦ D ≦ 3 mm. Belt transfer device characterized by.
ベルト転写装置において、 転写紙ガイド部材の転写ベルトに近接する側の端部近傍
の表面性を、中仕上げ以上とすることを特徴とするベル
ト転写装置。5. The belt transfer device according to claim 1, 2 or 3 or 4, wherein the surface property near the end of the transfer paper guide member on the side close to the transfer belt is at least semifinished. Belt transfer device.
ベルト転写装置において、 転写紙ガイド部材の転写ベルトに近接する側の端部側表
面と、転写ベルトの上部平面部分との段差：Ｌを、１≦
Ｌ≦３ｍｍとすることを特徴とするベルト転写装置。6. The belt transfer device according to claim 1, 2 or 3 or 4, wherein a step difference between a surface of an end portion of the transfer paper guide member near the transfer belt and an upper flat surface portion of the transfer belt: L 1 ≦
A belt transfer device, wherein L ≦ 3 mm.
５または６記載のベルト転写装置において、 転写ベルトの線速：ＶBが、定着ローラーの線速：ＶTよ
りも大きく設定され、 上記定着ローラーのニップ部と、転写ベルトの上部平面
部分の転写紙が分離する側の端部とを結ぶ直線に対し、
転写紙ガイド部材の転写紙案内面が、転写ベルトから離
れるに従い上記直線から下方へ離れるように傾斜してい
ることを特徴とするベルト転写装置。7. The belt transfer device according to claim 1, 2 or 3 or 4 or 5 or 6, wherein the linear velocity of the transfer belt: V B is set higher than the linear velocity of the fixing roller: V T. For the straight line that connects the nip portion of the fixing roller and the end of the upper flat surface of the transfer belt where the transfer paper is separated,
A belt transfer device, wherein a transfer paper guide surface of the transfer paper guide member is inclined so as to separate downward from the straight line as it moves away from the transfer belt.
５または６または７記載のベルト転写装置において、 転写紙ガイド部材により案内される転写紙が転写紙ガイ
ド部材から離れる部位に、除電ブラシを設けたことを特
徴とするベルト転写装置。8. The belt transfer device according to claim 1, 2 or 3 or 4 or 5 or 6 or 7, wherein a static elimination brush is provided at a portion where the transfer paper guided by the transfer paper guide member is separated from the transfer paper guide member. A belt transfer device characterized by being provided.
先の突出量：Ｋを、０≦Ｋ≦２ｍｍとしたことを特徴と
するベルト転写装置。9. The belt transfer device according to claim 8, wherein the protrusion amount K of the tip of the static elimination brush from the transfer paper guide surface of the transfer paper guide member is K ≦ K ≦ 2 mm. Transfer device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10661493A JP3302775B2 (en) | 1993-05-07 | 1993-05-07 | Belt transfer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10661493A JP3302775B2 (en) | 1993-05-07 | 1993-05-07 | Belt transfer device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06317990A true JPH06317990A (en) | 1994-11-15 |
| JP3302775B2 JP3302775B2 (en) | 2002-07-15 |
Family
ID=14438005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10661493A Expired - Lifetime JP3302775B2 (en) | 1993-05-07 | 1993-05-07 | Belt transfer device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3302775B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012108304A (en) * | 2010-11-17 | 2012-06-07 | Ricoh Co Ltd | Image forming apparatus |
| US9141065B2 (en) | 2012-03-14 | 2015-09-22 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
| JP2016090631A (en) * | 2014-10-30 | 2016-05-23 | 富士ゼロックス株式会社 | Electricity eliminator and image forming apparatus |
-
1993
- 1993-05-07 JP JP10661493A patent/JP3302775B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012108304A (en) * | 2010-11-17 | 2012-06-07 | Ricoh Co Ltd | Image forming apparatus |
| US9141065B2 (en) | 2012-03-14 | 2015-09-22 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
| JP2016090631A (en) * | 2014-10-30 | 2016-05-23 | 富士ゼロックス株式会社 | Electricity eliminator and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3302775B2 (en) | 2002-07-15 |
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