JPH0634130B2 - Method for separating transfer paper from electrophotographic photoreceptor - Google Patents
Method for separating transfer paper from electrophotographic photoreceptorInfo
- Publication number
- JPH0634130B2 JPH0634130B2 JP27430684A JP27430684A JPH0634130B2 JP H0634130 B2 JPH0634130 B2 JP H0634130B2 JP 27430684 A JP27430684 A JP 27430684A JP 27430684 A JP27430684 A JP 27430684A JP H0634130 B2 JPH0634130 B2 JP H0634130B2
- Authority
- JP
- Japan
- Prior art keywords
- transfer paper
- drum
- transfer
- toner image
- speed
- 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
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
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、電子写真感光体からの転写紙の分離方法に関
するもので、より詳細には、感光体ドラムからの転写紙
の分離を交流除電と転写紙搬送機構との組合せで行い、
交流除電に際して発生するオゾンを減少させるための改
良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating a transfer paper from an electrophotographic photosensitive member, and more specifically, a method for separating a transfer paper from a photosensitive drum by AC neutralization and transfer. Performed in combination with the paper transport mechanism,
The present invention relates to an improvement for reducing ozone generated during AC neutralization.
従来の技術及び発明の技術的課題 商業的な電子写真複写法では、電子写真感光体ドラムに
形成された静電像を現像してトナー像を形成させた後、
このドラムに対して転写紙を接触させ、次いで転写紙の
背面から静電像と同極性のコロナ放電を行って、トナー
像を転写紙上に転写させる。この静電転写に際して、ド
ラム表面に転写紙が静電的に吸引されるためドラムから
転写紙を分離するための操作が必要となる。In the conventional electrophotographic copying method, after the electrostatic image formed on the electrophotographic photosensitive drum is developed to form a toner image,
The transfer paper is brought into contact with this drum, and then a corona discharge having the same polarity as the electrostatic image is performed from the back surface of the transfer paper to transfer the toner image onto the transfer paper. At the time of this electrostatic transfer, the transfer paper is electrostatically attracted to the surface of the drum, and therefore an operation for separating the transfer paper from the drum is required.
この転写紙分離には、爪分離、ベルト分離等の機械的分
離法及び交流コロナ除電分離等の手法が用いられてい
る。前者の機械的分離法は、トナー像の転写に歪を与え
たり或いは転写紙上のトナー像に乱れを生じさせたりす
る可能性があるために、現在では交流コロナ除電分離が
広く使用されるに至っている。For this transfer paper separation, mechanical separation methods such as nail separation and belt separation, and methods such as AC corona charge removal separation are used. Since the former mechanical separation method may distort the transfer of the toner image or cause the toner image on the transfer paper to be disturbed, AC corona charge elimination separation is now widely used. There is.
しかしながら、交流コロナ除電処理においてはオゾンが
必然的に発生し、このオゾンが非晶質シリコン光導電体
層や有機光導電体層を劣化するという問題を生じてい
る。However, ozone is inevitably generated in the AC corona neutralization treatment, and this ozone causes a problem that the amorphous silicon photoconductor layer and the organic photoconductor layer are deteriorated.
発明の骨子及び目的 本発明者等は、感光体ドラムからの転写紙の分離に際し
て最も重要な転写紙先端部の分離のみを交流除電により
行い、以後の分離を転写紙が迂回した状態から転写紙に
張力を加えて機械的に行うことにより、交流コロナ除電
に伴なうオゾン発生量を減少せしめながらしかも転写画
像に乱れを生ずることなしに、円滑かつ確実な転写紙の
分離操作が可能となることを見出した。SUMMARY OF THE INVENTION AND OBJECTS OF THE INVENTION The present inventors have found that when separating a transfer paper from a photosensitive drum, only the most important part of the transfer paper front end is separated by AC neutralization, and the subsequent separation is performed after the transfer paper bypasses the transfer paper. By mechanically applying tension to the sheet, it is possible to reduce the amount of ozone generated due to AC corona charge removal, and to smoothly and reliably separate the transfer paper without disturbing the transferred image. I found that.
即ち、本発明の目的は、交流コロナ除電に伴なうオゾン
の発生量を少ないレベルに維持しながら、感光体ドラム
からの転写紙の分離を、転写画像の乱れを生ずることな
しに、しかも円滑且つ確実に行うことが可能な方法を提
供するにある。That is, the object of the present invention is to smoothly separate the transfer paper from the photoconductor drum without disturbing the transferred image while maintaining a small amount of ozone generated by the AC corona charge removal. And to provide a method that can be reliably performed.
本発明の他の目的は、感光体ドラムからの転写紙の分離
を交流コロナ除電と転写紙搬送機構との組合せで行うこ
とにより、交流除電に際して発生するオゾン量を減少さ
せることが可能な方法を提供するにある。Another object of the present invention is to provide a method capable of reducing the amount of ozone generated during AC neutralization by separating the transfer paper from the photoconductor drum by a combination of AC corona neutralization and a transfer paper transport mechanism. To provide.
発明の構成 本発明によれば、トナー像を有する電子写真感光体ドラ
ムから該ドラムと接触する転写紙上にトナー像を転写さ
せ、次いでトナー像を有する転写紙をドラムから分離す
る方法であって、トナー像を有する転写紙の実質上先端
部のみを交流コロナ除電に付し、ドラムから静電的に分
離された転写紙を、転写紙の直進通路からドラム側に迂
回した状態で転写紙搬送機構に案内し、ドラム周速より
若干大きい速度で駆動される転写紙搬送機構により転写
紙先端部を把持しドラム周速をｖ１、転写紙搬送機構の
移動速度をｖ２、転写紙の長さをｌ、転写紙直進通路の
長さをｄ、迂回通路でのたるみ長さをΔｌとしたとき、
下記式 が満足される条件下で先端部以外の転写紙をドラムから
機械的に剥離することを特徴とする方法が提供される。According to the present invention, there is provided a method of transferring a toner image from an electrophotographic photosensitive drum having a toner image onto a transfer paper in contact with the drum, and then separating the transfer paper having the toner image from the drum. A transfer paper transport mechanism, in which the transfer paper electrostatically separated from the drum is subjected to AC corona charge removal only on the front end of the transfer paper carrying the toner image, and the transfer paper is detoured from the straight path of the transfer paper to the drum side. The transfer paper transport mechanism driven at a speed slightly higher than the drum peripheral speed to grip the transfer paper leading edge to set the drum peripheral speed to v 1 , the transfer paper transport mechanism moving speed to v 2 , and the transfer paper length. Is 1, the length of the transfer paper straight passage is d, and the slack length in the bypass passage is Δl,
The following formula Is mechanically peeled off the transfer paper other than the tip portion from the drum under the condition that is satisfied.
本発明をその好適態様について以下に詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to its preferred embodiments.
分離装置 本発明方法が好適に適用される電子写真装置の一例を示
す第１図において、感光体ドラム１の表面には、アモル
ファス・シリコンのような電子写真感光層２が設けられ
ている。このドラム１の周囲には、感光層表面に一様に
帯電（例えばプラス帯電）させるためのコロナチャージ
ャ３、帯電された感光層を画像露光させるための光学系
４帯電露光により形成される静電像をトナーで現像する
ための現像機構５が設けられている。感光ドラム表面の
トナー像を転写紙６に転写するために、転写紙６をドラ
ム表面と接触するように供給する転写紙供給機構７が設
けられ、感光ドラム表面と接触した転写紙の背面側に
は、トナー転写用のコロナチャージャ８（極性はコロナ
チャージャ３と同じ）及びトナー像を有する転写紙をド
ラムから分離するための交流コロナチャージャ９が設け
られる。感光体ドラム１に関して転写紙供給機構７と反
対側にはエンドレスベルトの如き転写紙搬送機構１０が
設けられており、この搬送ベルト１０には、送られる転
写紙をベルト１０上に保持するためのサクション（吸
気）機構１１が設けられている。Separation Device In FIG. 1 showing an example of an electrophotographic apparatus to which the method of the present invention is preferably applied, an electrophotographic photosensitive layer 2 such as amorphous silicon is provided on the surface of a photosensitive drum 1. Around the drum 1, a corona charger 3 for uniformly charging (eg, positively charging) the surface of the photosensitive layer, an optical system 4 for imagewise exposing the charged photosensitive layer, and an electrostatic charge formed by charging exposure. A developing mechanism 5 for developing an image with toner is provided. In order to transfer the toner image on the surface of the photosensitive drum to the transfer paper 6, a transfer paper supply mechanism 7 for supplying the transfer paper 6 so as to contact the surface of the drum is provided, and the transfer paper is provided on the back side of the transfer paper in contact with the surface of the photosensitive drum. Is provided with a corona charger 8 for toner transfer (the polarity is the same as that of the corona charger 3) and an AC corona charger 9 for separating the transfer paper having the toner image from the drum. A transfer paper feeding mechanism 10 such as an endless belt is provided on the side opposite to the transfer paper feeding mechanism 7 with respect to the photosensitive drum 1, and the transfer belt 10 holds the transfer paper to be fed on the belt 10. A suction (intake) mechanism 11 is provided.
本発明によれば、分離用チャージャ９からの交流コロナ
除電を、トナー像を有する転写紙の実質上先端部のみに
ついて行うと、ドラム１から静電的に分離された転写紙
は、転写紙の自重と腰の強さにより、転写紙の直進通路
からドラム側に迂回した状態で転写紙搬送機構１０に案
内され、しかもドラム１の周速よりも若干大きい速度で
駆動される転写紙搬送機構１０により転写紙先端部を把
持され、先端部以外を交流コロナ除電を行わなくとも転
写紙をドラムから確実に剥離させることができる。According to the present invention, when the AC corona charge removal from the separation charger 9 is performed substantially only on the front end portion of the transfer paper having the toner image, the transfer paper electrostatically separated from the drum 1 becomes the transfer paper. Due to its own weight and waist strength, the transfer paper transport mechanism 10 is guided by the transfer paper transport mechanism 10 while detouring from the straight path of the transfer paper to the drum side, and is driven at a speed slightly higher than the peripheral speed of the drum 1. Thus, the transfer paper can be reliably peeled from the drum without being subjected to AC corona charge removal except the front end of the transfer paper.
発明の作用効果 本発明によれば、上述したように転写紙搬送機構１０の
速度をドラム１の周速よりも若干大きい速度で駆動させ
ることにより、転写紙先端部の搬送機構１０への把持及
び移送が確実に行われるのみならず、この速度差によ
り、ドラム１に静電的に付着している転写紙に対して、
引掻し用張力を与えることが可能となり、転写紙先端部
のみを交流コロナ除電に付するのみで、残りの転写紙を
ジャム（紙詰り）等を発生することなしに機械的に確実
に剥離することが可能となる。また、転写紙の先端部の
みに交流コロナ除電を行えばよいことから、転写紙全体
にわたって交流コロナ除電を行う場合に比して、オゾン
の発生量を著しく低減させることができ、アモルファス
・シリコン感光層等に対する有害な影響を著しく低減さ
せることが可能となる。EFFECTS OF THE INVENTION According to the present invention, as described above, by driving the speed of the transfer paper transport mechanism 10 at a speed slightly higher than the peripheral speed of the drum 1, the leading end of the transfer paper is gripped by the transport mechanism 10. Not only is the transfer reliably performed, but due to this speed difference, the transfer paper electrostatically attached to the drum 1
Scratch tension can be applied, and only the leading edge of the transfer paper is subjected to AC corona neutralization, and the remaining transfer paper can be peeled off mechanically without causing jams (paper jams). It becomes possible to do. In addition, since it is sufficient to perform AC corona charge removal only on the leading edge of the transfer paper, the amount of ozone generated can be significantly reduced compared to when AC corona charge removal is performed over the entire transfer paper. It is possible to significantly reduce harmful effects on layers and the like.
本発明においては、ドラム１から剥離された転写紙を直
進状態から迂回した状態で転写紙搬送機構１０に案内す
ることも、転写画像の乱れ乃至は転写時の画像ズレを防
止するために極めて重要である。即ち、このような構成
を採用することで、転写紙搬送機構１０の移動速度とド
ラム１の周速との差を転写紙の迂回通路から直進通路迄
の距離差によって吸収させ、画像の乱れや位置ずれを完
全に防止できるものである。In the present invention, it is also extremely important to guide the transfer paper separated from the drum 1 to the transfer paper transport mechanism 10 in a state of detouring from the straight-ahead state, in order to prevent the transfer image from being disturbed or the image shift at the time of transfer. Is. That is, by adopting such a configuration, the difference between the moving speed of the transfer paper transport mechanism 10 and the peripheral speed of the drum 1 is absorbed by the difference in the distance from the bypass path of the transfer paper to the straight path, and the image is disturbed. The position shift can be completely prevented.
発明の好適態様 本発明において、ドラム１の周速と搬送機構１０の移動
速度との差や、迂回通路と直進通路との差は、次のよう
に決定される。Preferred Embodiment of the Invention In the present invention, the difference between the peripheral speed of the drum 1 and the moving speed of the transfer mechanism 10 and the difference between the bypass passage and the straight passage are determined as follows.
本発明方法の原理を説明するための第２図において、位
置Ｐはドラム１と転写紙６との接触位置（転写位置）で
あり、位置Ｑは分離された転写紙先端が搬送機構１０に
より把持される位置である。各記号は次の意味を有す
る。In FIG. 2 for explaining the principle of the method of the present invention, a position P is a contact position (transfer position) between the drum 1 and the transfer paper 6, and a position Q is a position where the separated transfer paper leading end is gripped by the transport mechanism 10. It is the position where Each symbol has the following meaning.
ドラム１の周速 ｖ１ 搬送機構１０の速度 ｖ２ 転写紙の長さ ｌ ＰＱ間隔 ｄ （直進距離の長さ） 迂回通路でのたるみ長さ Δｌ 今、転写紙６の先端が位置Ｐに達したときの時間をゼロ
とし、転写紙先端が位置Ｑに達した時間をｔ1とし、転
写紙後端が位置Ｐに達した時間をｔ2とすると、次の式
が成立つ。Circumferential speed of the drum 1 v 1 Speed of the transport mechanism 10 v 2 Transfer paper length 1 PQ interval d (length of straight travel distance) Slack length in the bypass passage Δl Now, the tip of the transfer paper 6 reaches the position P When the time at which the transfer paper is moved is zero, the time when the leading edge of the transfer paper reaches the position Q is t 1, and the time when the trailing edge of the transfer paper reaches the position P is t 2 , the following equation is established.
ｖ1ｔ1＝d+Δｌ …(1) ｖ1ｔ2＝ｌ …(2) また、転写紙後端が位置Ｐに達するまでに転写紙とドラ
ムとの間に位置のずれを生じさせないためには、下記式
の条件が必要である。v 1 t 1 = d + Δl (1) v 1 t 2 = l (2) Further, since the transfer sheet and the drum are not displaced by the time when the rear end of the transfer sheet reaches the position P. Requires the condition of the following formula.
ｖ2（ｔ2−ｔ1）≦ｌ−ｄ …(3) これらの式から、下記式 が導かれ、式(4)が満足される場合に、トナー像の乱れ
や位置ずれなしに確実な機械的剥離操作を行い得ること
になる。v 2 (t 2 −t 1 ) ≦ l−d (3) From these expressions, the following expression Is introduced, and when the expression (4) is satisfied, a reliable mechanical peeling operation can be performed without the disturbance and the positional deviation of the toner image.
また、交流コロナ除電が必要な時間(T)は、式 であり、交流コロナ除電に伴なうオゾン発生量は、転写
紙全体にわたって除電を行う場合に比して、式 に低減されることになる。Also, the time (T) required for AC corona neutralization is Therefore, the amount of ozone generated with AC corona charge removal is Will be reduced to.
一般的に言って、転写紙先端部の確実な保持と有効な機
械的剥離との見地からは、ｖ2／ｖ1の比は１．０２乃至
１．１特に１．０３乃至１．０８の範囲にあることが望
ましい。Generally speaking, from the viewpoint of reliable holding of the leading edge of the transfer paper and effective mechanical peeling, the ratio v 2 / v 1 is 1.02 to 1.1, particularly 1.03 to 1.08. It is desirable to be in the range.
一例として、ｖ1＝４５０mm／sec、ｖ2＝４７２．５mm
／sec、ｌ＝４２０mm、ｄ＝５０mmの場合、迂回路にお
ける最低限の紙のたるみ長さは１７．６mmであることが
わかる。また、オゾンの発生量は、転写紙全面に交流コ
ロナ除電を行う場合に比して、わずか１６％の低いレベ
ルに抑制されることがわかる。As an example, v 1 = 450 mm / sec, v 2 = 472.5 mm
When / sec, l = 420 mm, and d = 50 mm, it can be seen that the minimum paper slack length in the detour is 17.6 mm. Further, it can be seen that the amount of ozone generated is suppressed to a low level of only 16% as compared with the case where the AC corona charge removal is performed on the entire surface of the transfer paper.
第１図は本発明方法が適用される電子写真装置の要部説
明図、第２図は本発明方法の原理を説明する図であり、
(a)図は、転写紙先端部が搬送ベルトに把持された状態
を、また(b)図は転写紙の後端が転写位置Ｐに到達した
状態を夫々表わす。図中引照数字は、１……感光体ドラ
ム、５……現像装置、６……転写紙、８……転写チャー
ジャ、９……分離チャージャ、１０……搬送ベルト、１
２……分離爪を夫々示す。FIG. 1 is an explanatory view of a main part of an electrophotographic apparatus to which the method of the present invention is applied, and FIG. 2 is a diagram illustrating the principle of the method of the present invention.
FIG. 7A shows a state in which the leading edge of the transfer sheet is gripped by the conveyor belt, and FIG. 7B shows a state in which the rear end of the transfer sheet reaches the transfer position P. In the figure, the reference numerals are 1 ... Photosensitive drum, 5 ... Developing device, 6 ... Transfer paper, 8 ... Transfer charger, 9 ... Separation charger, 10 ... Conveyor belt, 1
2 ... Separate claws are shown.
Claims (1)
ら該ドラムと接触する転写紙上にトナー像を転写させ、
次いでトナー像を有する転写紙をドラムから分離する方
法であって、トナー像を有する転写紙の実質上先端部の
みを交流コロナ除電に付し、ドラムから静電的に分離さ
れた転写紙を、転写紙の直進通路からドラム側に迂回し
た状態で転写紙搬送機構に案内し、ドラム周速より若干
大きい速度で駆動される転写紙搬送機構により転写紙先
端部を把持しドラム周速をｖ１、転写紙搬送機構の移動
速度をｖ２、転写紙の長さをｌ、転写紙直進通路の長さ
をｄ、迂回通路でのたるみ長さを△ｌとしたとき、下記
式 が満足される条件下で先端部以外の転写紙をドラムから
機械的に剥離することを特徴とする方法。1. A toner image is transferred from an electrophotographic photosensitive drum having a toner image onto a transfer paper in contact with the drum,
Then, a method of separating the transfer paper having the toner image from the drum, wherein substantially only the leading end of the transfer paper having the toner image is subjected to AC corona discharge, and the transfer paper electrostatically separated from the drum is The transfer paper is guided from the rectilinear path of the transfer paper to the drum side in a state of being detoured, and the transfer paper conveyance mechanism driven at a speed slightly higher than the drum peripheral speed grips the transfer paper leading end to set the drum peripheral speed to v 1 When the moving speed of the transfer paper transport mechanism is v 2 , the transfer paper length is 1, the transfer paper straight path length is d, and the slack length in the bypass path is Δl, Under the condition that is satisfied, the transfer paper other than the leading end is mechanically peeled from the drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27430684A JPH0634130B2 (en) | 1984-12-28 | 1984-12-28 | Method for separating transfer paper from electrophotographic photoreceptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27430684A JPH0634130B2 (en) | 1984-12-28 | 1984-12-28 | Method for separating transfer paper from electrophotographic photoreceptor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61156077A JPS61156077A (en) | 1986-07-15 |
| JPH0634130B2 true JPH0634130B2 (en) | 1994-05-02 |
Family
ID=17539803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27430684A Expired - Lifetime JPH0634130B2 (en) | 1984-12-28 | 1984-12-28 | Method for separating transfer paper from electrophotographic photoreceptor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0634130B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5200784A (en) * | 1989-02-25 | 1993-04-06 | Fujitsu Limited | Transferring device controlled for preventing the leading edge of a sheet from being excessively charged |
-
1984
- 1984-12-28 JP JP27430684A patent/JPH0634130B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61156077A (en) | 1986-07-15 |
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