JPH06348143A - Electrostatic separating device for transfer paper - Google Patents
Electrostatic separating device for transfer paperInfo
- Publication number
- JPH06348143A JPH06348143A JP13843093A JP13843093A JPH06348143A JP H06348143 A JPH06348143 A JP H06348143A JP 13843093 A JP13843093 A JP 13843093A JP 13843093 A JP13843093 A JP 13843093A JP H06348143 A JPH06348143 A JP H06348143A
- Authority
- JP
- Japan
- Prior art keywords
- transfer paper
- photoconductor
- voltage
- conductor
- transfer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000926 separation method Methods 0.000 claims abstract description 30
- 239000004020 conductor Substances 0.000 claims abstract description 26
- 238000005452 bending Methods 0.000 claims description 6
- 108091008695 photoreceptors Proteins 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 abstract 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- 230000002093 peripheral effect Effects 0.000 description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6532—Removing a copy sheet form a xerographic drum, band or plate
- G03G15/6535—Removing a copy sheet form a xerographic drum, band or plate using electrostatic means, e.g. a separating corona
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は転写紙の静電分離装置に
関するものであり、更に詳しくは、電子写真複写機，プ
リンタ，ファクシミリ等の画像形成装置に用いられる転
写紙の静電分離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 an electrostatic separation device for transfer paper, and more particularly to an electrostatic separation device for transfer paper used in image forming apparatuses such as electrophotographic copying machines, printers and facsimiles. It is a thing.
【０００２】[0002]
【従来の技術】従来より一般的に知られている電子写真
複写機においては、感光体表面上に形成したトナー像を
転写紙に移動させるために、静電転写が行われる。しか
し、静電転写を行うと転写紙が感光体表面に静電的に吸
着されるため、トナー像が転写紙に移動した後も転写紙
は感光体表面に吸着されたままになる。2. Description of the Related Art In a generally known electrophotographic copying machine, electrostatic transfer is performed in order to move a toner image formed on the surface of a photoconductor onto a transfer paper. However, when electrostatic transfer is performed, the transfer paper is electrostatically adsorbed on the surface of the photoconductor, so that the transfer paper remains adsorbed on the surface of the photoconductor even after the toner image is transferred to the transfer paper.
【０００３】感光体表面に転写紙が静電的に吸着する機
構を、負帯電のトナーを静電転写する場合を例に挙げ、
図２に基づいて説明する。同図に示すように、転写紙Ｐ
の背面(図の上方)から正コロナ放電を加えると、コロナ
による正イオン１３が転写紙Ｐの表面に荷電される。す
ると、感光体ドラム１表面に形成されている感光体層１
２とその下の基板１１との境界に負の電荷が誘起され
る。このときの転写紙Ｐの電位は、基板１１に対して数
１００〜数１０００ボルトである。トナー１４の存する
部分の感光体層１２の表面には、主帯電時に施された正
の電荷が残っていて、この正電荷によって、転写紙Ｐと
感光体ドラム１との間の静電力は弱くなるが、感光体層
１２のトナー１４が存しない部分は、露光時に正電荷が
取り除かれ、転写時のコロナ放電により負の電荷が誘起
されるので、感光体ドラム１と転写紙Ｐとの間には大き
な静電力が働くことになる。この静電力のために転写紙
Ｐと感光体ドラム１表面とは密着し、その間の電界の強
さはトナー１４のない部分においては、１００ｋＶ／ｃ
ｍにもなると言われている。普通の空気間隙の耐圧は３
０ｋＶ／ｃｍであるから、これを上回ることになるが、
間隙が小さいために放電は起こらない。A mechanism for electrostatically adhering a transfer paper to the surface of a photoconductor will be described by taking a case of electrostatically transferring negatively charged toner as an example.
A description will be given based on FIG. As shown in FIG.
When a positive corona discharge is applied from the back surface (upper part of the figure), the positive ions 13 by the corona are charged on the surface of the transfer paper P. Then, the photoconductor layer 1 formed on the surface of the photoconductor drum 1
Negative charges are induced at the boundary between 2 and the underlying substrate 11. The electric potential of the transfer paper P at this time is several hundred to several thousand volts with respect to the substrate 11. On the surface of the photoconductor layer 12 where the toner 14 exists, the positive charge applied during the main charging remains, and the positive charge weakens the electrostatic force between the transfer paper P and the photoconductor drum 1. However, in the portion of the photoconductor layer 12 where the toner 14 does not exist, the positive charge is removed at the time of exposure, and the negative charge is induced by corona discharge at the time of transfer. Therefore, between the photoconductor drum 1 and the transfer paper P. A large electrostatic force will be exerted on. Due to this electrostatic force, the transfer paper P and the surface of the photosensitive drum 1 are in close contact with each other, and the strength of the electric field therebetween is 100 kV / c in the portion without the toner 14.
It is said to be m. The pressure resistance of an ordinary air gap is 3
Since it is 0 kV / cm, it will exceed this,
No electric discharge occurs due to the small gap.
【０００４】従来より、感光体表面に静電的に吸着した
転写紙を強制的に分離させるための静電分離装置(以下
「分離装置」ともいう)が種々提案されている。代表的
なものとしては、ＡＣ除電分離方式や導体分離方式を採
用した分離装置が知られている。Conventionally, various electrostatic separators (hereinafter also referred to as "separator") for forcibly separating the transfer paper electrostatically adsorbed on the surface of the photoreceptor have been proposed. As a typical example, there is known a separation device that employs an AC static elimination separation method or a conductor separation method.
【０００５】前記ＡＣ除電分離方式は、一般的によく知
られている方式であり、ＡＣコロナ除電器で転写紙の裏
面からコロナ放電を行い、転写紙の表面電位を除電する
方式である。除電後の転写紙は、その剛性(即ち、転写
紙の腰の強さ)による撓みの反発力や自重によって、感
光体表面から分離される。The AC static elimination separation method is generally well known and is a method of discharging the surface potential of the transfer paper by performing corona discharge from the back surface of the transfer paper with an AC corona static eliminator. The charge-eliminating transfer paper is separated from the surface of the photoconductor by the repulsive force of bending due to its rigidity (that is, the stiffness of the transfer paper) and its own weight.
【０００６】前記導体分離方式は、導電性ローラ等を用
いて転写紙を感光体表面から剥離する方式である。この
方式を採用した分離装置として、例えば、転写後の感光
体表面に吸着している転写紙の背面に、アース又はバイ
アス電圧を印加する導体を接近又は接触配置し、この導
体と転写紙の帯電電荷の吸引力によって、転写紙を感光
体表面から分離する装置が提案されている(実開昭６１
−１８８１６３号)。The conductor separation method is a method of separating the transfer paper from the surface of the photoconductor using a conductive roller or the like. As a separating device adopting this method, for example, a conductor applying a ground voltage or a bias voltage is arranged close to or in contact with the back surface of the transfer paper adsorbed on the surface of the photoconductor after transfer, and the conductor and the transfer paper are charged. An apparatus has been proposed which separates the transfer paper from the surface of the photoconductor by the attraction of electric charges (Shokai Sho 61).
-188163).
【０００７】[0007]
【発明が解決しようとする課題】しかし、上記ＡＣ除電
分離方式の装置では、人体に有害なオゾンや感光体に悪
い影響を与える窒素酸化物(ＮＯｘ)等の放電生成物が発
生する等の問題がある。また、実開昭６１−１８８１６
３号の導体分離方式の装置では、導体に転写と逆極性の
バイアス電圧を印加した場合、トナーが感光体上に逆転
写されるおそれがある。また、導体をアースしただけで
は転写紙に対する吸引力が弱いので、感光体から転写紙
を十分に分離できないおそれがある。However, in the apparatus of the AC static elimination separation system, there are problems such as generation of ozone, which is harmful to the human body, and discharge products such as nitrogen oxide (NOx), which adversely affects the photoconductor. There is. In addition, actual development Sho 61-18816
In the No. 3 conductor separation type apparatus, when a bias voltage having a reverse polarity to that of the transfer is applied to the conductor, the toner may be reversely transferred onto the photoconductor. In addition, since the suction force against the transfer paper is weak only by grounding the conductor, the transfer paper may not be sufficiently separated from the photoconductor.
【０００８】本発明は、上記のような問題点を解決する
もので、放電生成物の発生を低減し、転写紙上のトナー
が感光体表面に逆転写されず、転写紙を確実に分離しう
る転写紙の静電分離装置を提供することを目的とするも
のである。The present invention solves the above problems, reduces the generation of discharge products, and prevents the toner on the transfer paper from being reversely transferred to the surface of the photoconductor, so that the transfer paper can be reliably separated. It is an object of the present invention to provide an electrostatic separation device for transfer paper.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に本発明では、移動する感光体の表面に静電的に吸着し
た転写紙を、該感光体の表面から分離する静電分離装置
において、前記感光体の表面の移動方向に対して順方向
に表面が移動する導体を、前記転写紙に接近又は接触す
るように設け、該導体に交流電圧又はパルス電圧を印加
することによって前記転写紙の除電を行い、該転写紙の
自重及び／又は転写紙の剛性による撓みの反発力で、転
写紙を感光体表面から分離させることを特徴としてい
る。In order to achieve the above object, the present invention provides an electrostatic separation device for separating transfer paper electrostatically adsorbed on the surface of a moving photoconductor from the surface of the photoconductor. The transfer paper is provided by providing a conductor whose surface moves in a forward direction with respect to the moving direction of the surface of the photoconductor so as to approach or contact the transfer paper, and by applying an AC voltage or a pulse voltage to the conductor. Is removed, and the transfer paper is separated from the surface of the photoconductor by the repulsive force of bending due to the weight of the transfer paper and / or the rigidity of the transfer paper.
【００１０】前記導体の形状としては、例えばローラ形
状やベルト形状を挙げることができる。ローラ形状のも
のを用いた場合、ローラ材質を導電性ゴムとし、導体を
感光体の表面移動速度とほぼ等しい表面移動速度で回転
させるのが好ましい。また、ベルト形状のものを用いた
場合も同様に、導体を感光体の表面移動速度とほぼ等し
い速度で回転させるのが好ましい。Examples of the shape of the conductor include a roller shape and a belt shape. When a roller-shaped member is used, it is preferable that the roller is made of conductive rubber and the conductor is rotated at a surface moving speed substantially equal to the surface moving speed of the photoconductor. Similarly, when a belt-shaped member is used, it is preferable that the conductor is rotated at a speed substantially equal to the surface moving speed of the photosensitive member.
【００１１】[0011]
【作用】上記構成によると、転写紙の表面に接近又は接
触するように設けられた導体に、交流電圧又はパルス電
圧を印加すると、前記転写紙は除電されるため感光体と
転写紙との間で作用する吸引力が低下し、その結果、転
写紙が感光体表面に吸着されたときの転写紙の撓みの反
発力及び／又は転写紙の自重が、当該吸引力よりも大き
くなってこれに打ち勝ち、感光体表面から転写紙が剥離
される。According to the above construction, when an AC voltage or a pulse voltage is applied to the conductor provided so as to approach or contact the surface of the transfer paper, the transfer paper is neutralized, so that the space between the photoconductor and the transfer paper is removed. The suction force acting on the transfer paper is reduced, and as a result, the repulsive force of the bending of the transfer paper and / or the self-weight of the transfer paper when the transfer paper is attracted to the surface of the photoconductor becomes larger than the suction force. Overcome and the transfer paper is peeled off from the surface of the photoconductor.
【００１２】[0012]
【実施例】以下、本発明の一実施例を図面を参照しつつ
説明する。図１は、本発明を適用した分離装置が電子写
真複写機に用いられた状態を模式的に示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a state in which a separation device to which the present invention is applied is used in an electrophotographic copying machine.
【００１３】同図中、感光体ドラム１は、アルミニウム
等の金属製素管の表面にアモルファスシリコン(ａ-Ｓ
ｉ)系、 その他の感光体材料から成る感光層を形成した
ものである。この感光体ドラム１は、複写機本体内にお
いてほぼ水平に配置され、複写機本体内に設けられた駆
動系(不図示)によって、矢印Ａで示す時計回り方向へ回
転駆動される。この回転方向は、後述する分離ローラ３
の反時計回り方向(矢印Ｂ方向)への回転駆動と同様、転
写紙Ｐの搬送方向に対して順方向となるように設定され
ている。In the figure, the photosensitive drum 1 is made of amorphous silicon (a-S) on the surface of a metal tube made of aluminum or the like.
i) A photosensitive layer formed of a photosensitive material other than i). The photoconductor drum 1 is arranged substantially horizontally in the main body of the copying machine, and is rotationally driven in a clockwise direction indicated by an arrow A by a drive system (not shown) provided in the main body of the copying machine. This rotation direction is defined by the separation roller 3 described later.
Similarly to the rotational drive in the counterclockwise direction (the direction of arrow B), the direction is set to be the forward direction with respect to the transport direction of the transfer paper P.
【００１４】この感光体ドラム１の周囲には帯電手段
５，現像手段６，転写チャージャー２及び除電・クリー
ニング手段７が、その順序で感光体ドラム１の回転方向
に沿って配設されている。また、帯電手段５と現像手段
６との間において、感光体ドラム１は露光手段(不図示)
からのレーザ光Ｌで露光を受けるようになっている。Around the photosensitive drum 1, charging means 5, developing means 6, transfer charger 2 and discharging / cleaning means 7 are arranged in this order along the rotational direction of the photosensitive drum 1. Between the charging means 5 and the developing means 6, the photosensitive drum 1 is exposed to light (not shown).
Is exposed by the laser beam L from
【００１５】上記のような構成を備えた電子写真複写機
において、まず、帯電手段５でコロナ放電等が行われる
ことによって、感光体ドラム１の表面感光層が帯電され
る。帯電された感光体ドラム１表面に、原稿(不図示)か
ら読み込まれた画像に基づくレーザ光Ｌの照射が前記露
光手段で行われることにより、静電潜像が形成される。
この静電潜像は、現像手段６でトナー現像されてトナー
像となる。一方、転写紙Ｐは、一対のレジストローラ８
により感光体ドラム１の回転(矢印Ａ)に対応して感光体
ドラム１表面の周速度と等しい周速度で、感光体ドラム
１と転写チャージャー２との間に搬送される。In the electrophotographic copying machine having the above-mentioned structure, first, the surface photosensitive layer of the photosensitive drum 1 is charged by corona discharge or the like by the charging means 5. An electrostatic latent image is formed on the surface of the charged photosensitive drum 1 by irradiating the surface of the photosensitive drum 1 with laser light L based on an image read from a document (not shown) by the exposing means.
This electrostatic latent image is toner-developed by the developing means 6 to become a toner image. On the other hand, the transfer paper P has a pair of registration rollers 8
Thus, the photosensitive drum 1 is conveyed between the photosensitive drum 1 and the transfer charger 2 at a peripheral speed equal to the peripheral speed of the surface of the photosensitive drum 1 corresponding to the rotation (arrow A) of the photosensitive drum 1.
【００１６】搬送されてきた転写紙Ｐが感光体ドラム１
表面と接触している間、転写チャージャー２により感光
体ドラム１表面に付着している帯電トナーが転写紙Ｐの
表面に静電転写される。トナー像が転写された転写紙Ｐ
は、感光体ドラム１表面の周速度と等しい周速度で矢印
Ｂ方向に回転する分離ローラ３で、感光体ドラム１表面
から静電剥離される。そして、定着手段４でローラ対間
を通過する間に加熱，加圧されることによって、転写紙
Ｐ上にトナー像が定着される。一方、転写後、除電・ク
リーニング手段７で、感光体ドラム１表面の残存トナー
の除去及び除電が行われ、前回の帯電時から感光体ドラ
ム１が丁度１回転したところで次の帯電に備えられる。The transferred transfer paper P is the photosensitive drum 1.
While in contact with the surface, the transfer charger 2 electrostatically transfers the charged toner adhering to the surface of the photosensitive drum 1 to the surface of the transfer paper P. Transfer paper P on which the toner image is transferred
Is a separation roller 3 that rotates in the direction of arrow B at a peripheral speed equal to the peripheral speed of the surface of the photosensitive drum 1, and is electrostatically separated from the surface of the photosensitive drum 1. Then, the toner image is fixed on the transfer paper P by being heated and pressed by the fixing means 4 while passing between the pair of rollers. On the other hand, after the transfer, the charge removing / cleaning means 7 removes the residual toner on the surface of the photoconductor drum 1 and removes the charge, and prepares for the next charging when the photoconductor drum 1 has just rotated once since the previous charging.
【００１７】このような構成を有する電子写真複写機に
おいて、本実施例の分離装置は、移動する感光体ドラム
１の表面に静電的に吸着した転写紙Ｐを、感光体ドラム
１の表面から分離するものであって、その特徴は、感光
体ドラム１の表面の移動方向に対して順方向に表面が移
動する分離ローラ３を、転写紙Ｐに接近又は接触するよ
うに設け、分離ローラ３に交流電圧又はパルス電圧を印
加することによって転写紙Ｐの除電を行い、転写紙Ｐの
自重及び／又は転写紙Ｐの剛性による撓みの反発力で、
転写紙Ｐを感光体ドラム１表面から分離させることにあ
る。In the electrophotographic copying machine having such a structure, the separating device of the present embodiment is configured so that the transfer paper P electrostatically adsorbed on the surface of the moving photosensitive drum 1 is transferred from the surface of the photosensitive drum 1. The separation roller 3 is characterized in that the separation roller 3 whose surface moves in the forward direction with respect to the moving direction of the surface of the photosensitive drum 1 is provided so as to approach or contact the transfer paper P. The transfer paper P is neutralized by applying an AC voltage or a pulse voltage to the transfer paper P, and the repulsive force of the flexure due to the weight of the transfer paper P and / or the rigidity of the transfer paper P causes
This is to separate the transfer paper P from the surface of the photosensitive drum 1.
【００１８】分離ローラ３は、図１に示すように主に導
電性ゴムから成るローラ本体(体積電気抵抗率：ρv＝１
０6〜１０7Ω・ｃｍ)３ａと金属製の回転軸３ｂとから成
っている。感光体ドラム１の表面の移動方向に対して順
方向に移動する分離ローラ３の表面は、導体であるロー
ラ本体３ａで構成されている。このローラ本体３ａは、
回転軸３ｂの周りに長軸ローラ状に固着されている。ま
た、ローラ本体３ａとしては、例えば炭素やアルカリ金
属を混入したポリスチレン樹脂やウレタン樹脂のような
導電性樹脂材料や導電性ゴム材料等により形成されたも
のを用いることができる。回転軸３ｂには、転写時に接
触端子(不図示)を介して、交流(ＡＣ)電圧又はパルス電
圧が電源９から回転軸３ｂに印加される。As shown in FIG. 1, the separating roller 3 is a roller body (volume electric resistivity: ρv = 1) mainly made of conductive rubber.
0 6 to 10 7 Ω · cm) 3a and a metallic rotating shaft 3b. The surface of the separation roller 3 that moves in the forward direction with respect to the moving direction of the surface of the photosensitive drum 1 is composed of a roller body 3a that is a conductor. This roller body 3a is
It is fixed around the rotary shaft 3b in the shape of a long-axis roller. As the roller body 3a, for example, one formed of a conductive resin material such as polystyrene resin or urethane resin mixed with carbon or alkali metal or a conductive rubber material can be used. An alternating current (AC) voltage or a pulse voltage is applied to the rotating shaft 3b from the power source 9 via a contact terminal (not shown) at the time of transfer.
【００１９】ここでは、分離ローラ３を感光体ドラム１
表面の表面移動速度(周速度)と等しい周速度で順方向
(矢印Ｂ方向)に回転させているが、これによって感光体
ドラム１表面に近接することが可能になる。その結果、
転写効率が向上するため、電流，電圧を小さくすること
ができる。それにより、人体に有害なオゾンや感光体に
悪い影響を与えるＮＯｘ等の放電生成物の発生を低減す
ることが可能となる。また、ローラ形状の導体(即ち、
分離ローラ３)に限らず、例えばベルト形状の導体を用
いてもよい。その場合でも、ベルト形状の導体の表面移
動速度を感光体ドラム１の表面移動速度とほぼ等しい速
度で移動させることによって、上記と同様の効果を得る
ことができる。Here, the separation roller 3 is connected to the photosensitive drum 1.
Forward direction at a peripheral speed equal to the surface moving speed (peripheral speed) of the surface
Although it is rotated in the direction of arrow B, this makes it possible to approach the surface of the photosensitive drum 1. as a result,
Since the transfer efficiency is improved, the current and voltage can be reduced. This makes it possible to reduce the generation of ozone, which is harmful to the human body, and discharge products such as NOx, which adversely affects the photoconductor. Also, a roller-shaped conductor (i.e.,
For example, a belt-shaped conductor may be used instead of the separation roller 3). Even in that case, the same effect as described above can be obtained by moving the surface moving speed of the belt-shaped conductor at a speed substantially equal to the surface moving speed of the photosensitive drum 1.
【００２０】本実施例の構成によれば、転写紙Ｐの表面
に接近又は接触された導体である分離ローラ３に、交流
電圧又はパルス電圧を印加して転写紙Ｐの除電を行う
と、感光体ドラム１と転写紙Ｐとの間で作用する吸引力
が低下するため、転写紙Ｐが感光体ドラム１表面に吸着
されたときの転写紙Ｐの撓みの反発力及び／又は転写紙
の自重が、当該吸引力よりも大きくなってこれに打ち勝
ち、感光体ドラム１表面から転写紙Ｐが剥離される。According to the structure of the present embodiment, when the transfer paper P is decharged by applying an AC voltage or a pulse voltage to the separation roller 3 which is a conductor which is close to or in contact with the surface of the transfer paper P, the photosensitive material is exposed. Since the suction force acting between the body drum 1 and the transfer paper P is reduced, the repulsive force of the bending of the transfer paper P when the transfer paper P is attracted to the surface of the photosensitive drum 1 and / or the self-weight of the transfer paper P However, the suction force becomes larger than the suction force and overcomes the suction force, and the transfer paper P is separated from the surface of the photoconductor drum 1.
【００２１】つまり、感光体ドラム１の表面から転写紙
Ｐが分離するのは、静電剥離ではあっても、転写紙Ｐに
対する転写ローラ３の吸引力によるものではなく、この
分離は、主に感光体ドラム１と転写紙Ｐとの間で作用す
る静電力による静電エネルギーよりも、転写紙Ｐが感光
体ドラム１に吸引されその表面に吸着したときに蓄えら
れる剛性による撓みの弾性エネルギー(反発力)の方が大
きくなることによって生じるものである。これは従来よ
り知られているＡＣコロナ除電器を用いた場合と同様の
原理によるものである。That is, the transfer paper P is separated from the surface of the photosensitive drum 1 by electrostatic attraction, not by the suction force of the transfer roller 3 to the transfer paper P. This separation is mainly performed. The elastic energy of the flexure due to the rigidity stored when the transfer paper P is attracted to the surface of the photoconductor drum 1 and adsorbed onto the surface of the photoconductor drum 1 rather than the electrostatic energy due to the electrostatic force acting between the photoconductor drum 1 and the transfer paper P ( The repulsive force) becomes larger. This is based on the same principle as in the case of using a conventionally known AC corona charge eliminator.
【００２２】本実施例ではＡＣコロナ除電器を用いず、
導体分離方式を採用しているので、必要な電流，電圧を
小さくすることができる。そのため、人体に有害なオゾ
ンや感光体に悪い影響を与えるＮＯｘ等の放電生成物の
発生を低減することができる。また、分離ローラ３にＡ
Ｃ電圧又はパルス電圧を印加することによって、転写紙
Ｐ上のトナーを感光体ドラム１表面に逆転写させること
なく、転写紙Ｐを確実に分離することができる。In this embodiment, the AC corona discharger is not used,
Since the conductor separation method is adopted, the required current and voltage can be reduced. Therefore, it is possible to reduce the generation of discharge products such as ozone that is harmful to the human body and NOx that adversely affects the photoconductor. In addition, the separation roller 3 has an A
By applying the C voltage or the pulse voltage, it is possible to reliably separate the transfer paper P without reversely transferring the toner on the transfer paper P to the surface of the photosensitive drum 1.
【００２３】[0023]
【発明の効果】以上説明したように本発明の転写紙の静
電分離装置では、転写紙の表面に接近又は接触するよう
に設けられている導体に、交流電圧又はパルス電圧が印
加されることによって、転写紙は除電され、転写紙の自
重や転写紙の剛性による撓みの反発力で感光体表面から
分離されるので、転写紙を確実に分離することが可能で
ある。前記導体の表面は、感光体の表面の移動方向に対
して順方向に移動するので、感光体の表面に導体を近接
させることができる。その結果、必要な電流，電圧が小
さくて済み、放電生成物(オゾン，ＮＯｘ)の発生を大幅
に低減することができる。また、転写紙の搬送が妨げら
れないので、転写紙の搬送を円滑に行うことができる。As described above, in the electrostatic separation apparatus for transfer paper according to the present invention, an AC voltage or a pulse voltage is applied to the conductor provided so as to approach or contact the surface of the transfer paper. As a result, the transfer paper is neutralized and separated from the surface of the photoconductor by the repulsive force of bending due to the weight of the transfer paper and the rigidity of the transfer paper, so that the transfer paper can be reliably separated. Since the surface of the conductor moves in the forward direction with respect to the moving direction of the surface of the photoconductor, the conductor can be brought close to the surface of the photoconductor. As a result, the required current and voltage are small, and the generation of discharge products (ozone, NOx) can be greatly reduced. Further, since the transfer paper is not hindered from being conveyed, the transfer paper can be smoothly conveyed.
【００２４】前記除電時には、バイアス電圧を転写紙に
印加した場合のように、転写紙上のトナーが感光体表面
に逆転写されるといったことは起こらない。また、ＡＣ
コロナ除電器を用いず、導体分離方式を採用しているの
で、必要な電流，電圧が小さくて済み、そのため放電生
成物(オゾン，ＮＯｘ等)の発生を大幅に低減することが
できる。At the time of the neutralization, unlike the case where a bias voltage is applied to the transfer paper, the toner on the transfer paper is not reversely transferred to the surface of the photoconductor. Also, AC
Since the conductor separation method is used without using the corona charge eliminator, the required current and voltage are small, and therefore the generation of discharge products (ozone, NOx, etc.) can be greatly reduced.
【図１】本発明の一実施例の静電分離装置を備えた電子
写真複写機を模式的に示す正面図。FIG. 1 is a front view schematically showing an electrophotographic copying machine equipped with an electrostatic separation device according to an embodiment of the present invention.
【図２】静電転写の機構を説明するための図。FIG. 2 is a diagram for explaining a mechanism of electrostatic transfer.
１ …感光体ドラム ２ …転写チャージャー ３ …分離ローラ Ｐ …転写紙 1 ... Photosensitive drum 2 ... Transfer charger 3 ... Separation roller P ... Transfer paper
Claims (1)
転写紙を、該感光体の表面から分離する静電分離装置に
おいて、 前記感光体の表面の移動方向に対して順方向に表面が移
動する導体を、前記転写紙に接近又は接触するように設
け、該導体に交流電圧又はパルス電圧を印加することに
よって前記転写紙の除電を行い、該転写紙の自重及び／
又は転写紙の剛性による撓みの反発力で、転写紙を感光
体表面から分離させることを特徴とする転写紙の静電分
離装置。1. An electrostatic separation device for separating transfer paper, which is electrostatically adsorbed on the surface of a moving photoconductor, from the surface of the photoconductor, in a forward direction with respect to a moving direction of the surface of the photoconductor. A conductor whose surface moves is provided so as to approach or contact the transfer paper, and the transfer paper is discharged by applying an AC voltage or a pulse voltage to the conductor, and the transfer paper's own weight and / or
Alternatively, an electrostatic separation device for a transfer paper, characterized in that the transfer paper is separated from the surface of the photoconductor by a repulsive force of bending due to the rigidity of the transfer paper.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13843093A JPH06348143A (en) | 1993-06-10 | 1993-06-10 | Electrostatic separating device for transfer paper |
| EP94108876A EP0628886A1 (en) | 1993-06-10 | 1994-06-09 | Transfer sheet separator in an image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13843093A JPH06348143A (en) | 1993-06-10 | 1993-06-10 | Electrostatic separating device for transfer paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06348143A true JPH06348143A (en) | 1994-12-22 |
Family
ID=15221792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13843093A Pending JPH06348143A (en) | 1993-06-10 | 1993-06-10 | Electrostatic separating device for transfer paper |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0628886A1 (en) |
| JP (1) | JPH06348143A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9426174D0 (en) * | 1994-12-23 | 1995-02-22 | Xerox Corp | Electrically biassed sheet stripping apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5810764A (en) * | 1981-07-14 | 1983-01-21 | Fuji Xerox Co Ltd | Transferred paper peeling device for electronic copying machine |
| JPS58211774A (en) * | 1982-06-04 | 1983-12-09 | Ricoh Co Ltd | Transfer/separation method in electrophotographic copying machine |
| JPS61188163U (en) * | 1986-05-01 | 1986-11-22 | ||
| JPH0467183A (en) * | 1990-07-09 | 1992-03-03 | Canon Inc | Transfer separation device of image forming device |
-
1993
- 1993-06-10 JP JP13843093A patent/JPH06348143A/en active Pending
-
1994
- 1994-06-09 EP EP94108876A patent/EP0628886A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0628886A1 (en) | 1994-12-14 |
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