JPS5855957A - Separator - Google Patents

Abstract

PURPOSE:To separate the preceding end of a sheet-like member surely from backing by connecting an air tank which is held under negative pressure via an air valve to a suction means provided in a separating part, and opening the air valve for the slight time upon arrival of the sheet at said part. CONSTITUTION:A perforated roller 11 is provided in proximity to a photosensitive drum 1 on the slightly down stream side in a transfer position, and a driving reller 12 is provided in the conveying direction of transfer paper apart from said roller. An endless belt 13 having many holes is put on these two rollers. A suction box 15 which has a suction fan 14 in the inside and has an opening on the wall surface in contact with the bottom surface of the belt on the upper side, and a suction pipe 16 which contacts slidingly with the inner side of the roller 11 in the position proximate to the photoreceptor 1 and has a slit 16a in the sliding contact part are provided. An air tank 19 is connected to one end of said pipe via a flexible hose 17 and an air valve 18, and an air pump 20 is connected to the tank, whereby a separator 10 is constituted.

Description

【発明の詳細な説明】 この発明は支持体上に静電気等の力で密着しているシー
ト状部材を、その背面の気圧を小さくして支持体から分
離する分離装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separation device that separates a sheet-like member that is in close contact with a support by force such as static electricity from the support by reducing the air pressure on the back side of the sheet-like member.

電子写真複写機では、感光体上に所定のプロセスを経て
形成されたトナー像は、転写チャージャーにより転写紙
をトナーと逆極性に帯電させ転写紙上に転写される。し
たがって転写紙は静電気の力で感光体表面に密着し、転
写後これを感光体から分離するために種々の工夫が必要
になる。この分離手段として、分離爪等の機械的手段や
導体分離ベルト等の静電気的手段と並んで、多孔ベルト
を介して吸引ファンによる負圧により転写紙を背面から
吸引して分離するとともに定着装置に向って搬送する手
段が、比較的構成が簡単で感光体表面や転写紙自身を傷
付けることがなく、搬送手段をも兼ねる等の利点を有す
るところから広く使用されている。In an electrophotographic copying machine, a toner image formed on a photoreceptor through a predetermined process is transferred onto the transfer paper by charging the transfer paper with a polarity opposite to that of the toner using a transfer charger. Therefore, the transfer paper adheres to the surface of the photoreceptor due to electrostatic force, and various measures are required to separate it from the photoreceptor after transfer. As this separation means, in addition to mechanical means such as separation claws and electrostatic means such as conductor separation belts, negative pressure from a suction fan is used to suction the transfer paper from the back side through a perforated belt and separate it. The means for conveying the photoreceptor toward the photoreceptor is widely used because it has advantages such as a relatively simple structure, no damage to the surface of the photoreceptor or the transfer paper itself, and the ability to also serve as a conveyance means.

しかし、従来のこの型式の分離装置の場合は、吸−引フ
アンによる吸引力が弱く、先端が分離された後の転写紙
をベルトに吸着して搬送するには適しているが、感光体
表面に強く密着している転写紙の先端の分離の確実性が
低いという欠点があった。However, in the case of the conventional separation device of this type, the suction force of the suction fan is weak, and although it is suitable for conveying the transfer paper by attracting it to the belt after the leading edge has been separated, the surface of the photoreceptor There was a drawback that the separation of the leading edge of the transfer paper, which was tightly adhered to the paper, was not reliable.

この発明は、上記の電子写真複写機における転写紙の感
光体からの分離の場合の如く、支持体に静電気等の力で
密着しているノート状部材を背面の気圧を小さくして支
持体から分離する型式の従来の分離装置の上述の欠点を
除去した、ノート状部材の先端を支持体より確実に分離
することのできるこの形式の分離装置を提供することを
目的とする。This invention aims to separate a notebook-like member that is in close contact with a support by static electricity or other force from the support by reducing the air pressure on the back side, as in the case of separating the transfer paper from the photoreceptor in the above-mentioned electrophotographic copying machine. It is an object of the present invention to provide a separation device of this type which eliminates the above-mentioned drawbacks of the conventional separation device of the separation type and which can reliably separate the tip of a notebook-like member from a support.

以下、本発明をその実施例を示す図面たもとすいて詳細
に説明する。Hereinafter, the present invention will be explained in detail with reference to drawings showing embodiments thereof.

第１図は、通常の電子写真複写機の転写紙分離装置に本
発明を適用した実施例を示す図である。FIG. 1 is a diagram showing an embodiment in which the present invention is applied to a transfer paper separating device of an ordinary electrophotographic copying machine.

図において、感光体ドラムｌの周囲の転写位置には転写
チャージャー２が設けられてとり、図示せぬ給紙部よシ
の転写紙出口３が転写位置に臨んでいる。転写位置の下
流側には以下に詳述する分離装置１０が設けられている
。In the figure, a transfer charger 2 is provided at a transfer position around the photosensitive drum 1, and a transfer paper outlet 3 of a paper feed section (not shown) faces the transfer position. A separation device 10, which will be described in detail below, is provided downstream of the transfer position.

分離装置ｌＯは、転写位置のやや下流側で感光体ドラム
ｌに極く近接して設けられた多孔ローラ１１゜転写紙の
搬送方向にこれと離れて設けられた駆動ローラ１２、こ
れら両ローラに掛は渡された多数の孔を有するエンドレ
スベルト１３、内部に吸引７アロを有する吸引箱１５、
前記の多孔ローラ１１の感電体ｌに近接する位置の内側
に摺接し、この摺接部にスリット２６ａ’を有する吸引
パイプ１６、該吸引パイプの一端に７レキンプルホース
１７、エア弁１８を介して接続されたエアタンク１９、
該エアタンク１９に接続されたエアポンプ２ｏより構成
されている。The separating device 10 includes a perforated roller 11 which is provided very close to the photoreceptor drum 1 slightly downstream of the transfer position, a drive roller 12 which is provided apart from the photosensitive drum 1 in the transfer direction of the transfer paper, and both of these rollers. An endless belt 13 with a large number of holes passed over the hook, a suction box 15 with 7 suction holes inside,
A suction pipe 16 is in sliding contact with the inside of the perforated roller 11 at a position close to the electrosensitive body l, and has a slit 26a' in this sliding contact portion, a seven-leak pull hose 17 is connected to one end of the suction pipe, and an air valve 18 is connected to the suction pipe 16. air tank 19 connected to
It consists of an air pump 2o connected to the air tank 19.

この装置の作用は次の通りである。The operation of this device is as follows.

感光体ドラムｌ上に形成されたトナー像は、転写紙出口
３より転写位置に搬送された転写繻敢、転写チャージャ
ー２により転写された後、分離装置ｌＯに到る。The toner image formed on the photoreceptor drum 1 is transferred from a transfer paper outlet 3 to a transfer position, transferred by a transfer charger 2, and then reaches a separation device 1O.

コピー開始信号とともにエアポンプ２ｏが起動し、稟ア
タンク１９の内部は転写紙Ｓが分離位置に到達する迄に
十分減圧されている。転写紙Ｓの先端が感光体ドラムｌ
と多孔ローラ１１の近接点に到達した時点で、常時は閉
じているエア弁１８が開き、吸引パイプ１６及びフレキ
ンプルポース１７内とエアタンク１９内とは均圧し、吸
引パイプ１６内は十分負圧となシ、スリット１６α、多
孔ローラ１１の孔、ベルト１３の孔を介して転写紙の先
端部裏面を強く吸引し、ベルト１３の表面に吸着する。The air pump 2o is activated together with the copy start signal, and the pressure inside the cleaning tank 19 is sufficiently reduced by the time the transfer paper S reaches the separation position. The leading edge of the transfer paper S is the photosensitive drum L
When the point near the perforated roller 11 is reached, the normally closed air valve 18 opens, and the pressure in the suction pipe 16, flexible pull port 17, and air tank 19 is equalized, and the inside of the suction pipe 16 is sufficiently negative pressure. The back surface of the leading edge of the transfer paper is strongly attracted through the slit 16α, the hole of the perforated roller 11, and the hole of the belt 13, and is adsorbed to the surface of the belt 13.

かく先端が分離した転写紙の先端部が吸引箱１５の吸引
範囲に到達するとコピー中常時堅動されている吸引ファ
ン１４の作用で転写紙はベル）１３の表面に吸着される
のでエア弁１８を閉じ、その後は吸引ファ７１４の吸引
力のみにより転写紙はベル）１３の表面に吸着されて搬
送される。When the leading edge of the transfer paper whose leading edge has been separated reaches the suction range of the suction box 15, the transfer paper is attracted to the surface of the bell 13 by the action of the suction fan 14, which is constantly operated during copying, and the air valve 18 After that, the transfer paper is attracted to the surface of the bell 13 and conveyed only by the suction force of the suction fan 714.

感光体ドラム１と多孔ベルト１３のギャップはＯから転
写紙Ｓの厚さの間であることが必要であシ、実際的には
バネ等の手段により適当な圧力で変位可能に接触させて
おくことが好都合である。その理由は、もし転写紙と多
孔ベルトとの間に隙間があると周囲から空気がこの隙間
に侵入して転写紙を吸着することができないからである
。同様に、多孔ローラ１１の内面と吸引パイプ１６の間
隙も極力小さくすることが必要であり、摩擦を生じない
程度に摺接させることが適当である。The gap between the photosensitive drum 1 and the perforated belt 13 must be between O and the thickness of the transfer paper S, and in practice, they are brought into contact so that they can be displaced with an appropriate pressure by means such as a spring. This is convenient. The reason for this is that if there is a gap between the transfer paper and the perforated belt, air from the surroundings will enter this gap and the transfer paper will not be able to be attracted. Similarly, the gap between the inner surface of the perforated roller 11 and the suction pipe 16 must be made as small as possible, and it is appropriate that they be in sliding contact to the extent that no friction occurs.

第２図及び第３図に示す他の実施例では、分離装置３０
は、中空で管壁に小さい孔の明いたパイプ３１（５すだ
れ状につないで形成されたエンドレスベルト３２が、感
光体ドラムｌに接して設けられたローラ３３と駆動ロー
ラ３４とに担は渡されている。パイプ３１はいずれも同
じ側の端が閉じており、他端が開いている。感光体ドラ
ム１とベルト３２との接触点から適当な距離の間、ベル
ト３２を構成するパイプ３１の上記の開いた管口と摺接
する如く吸引箱３５が設けられており、該摺接面にはパ
イプ３１の開口の経路に合せてスリットが設けられてい
る。上記吸引箱３５にはフレキンプルホース３６、エア
弁３７を介してエアタンク３８が接続されており、エア
タンク３８にはエアポンプ３９が接続されている。In another embodiment shown in FIGS. 2 and 3, the separation device 30
In this example, an endless belt 32 formed by connecting five hollow pipes 31 (5) in the shape of a blind is passed between rollers 33 and drive rollers 34 provided in contact with the photoreceptor drum l. The pipes 31 are all closed at the same end and open at the other end. A suction box 35 is provided so as to be in sliding contact with the open pipe opening, and a slit is provided on the sliding surface in accordance with the path of the opening of the pipe 31.The suction box 35 has a flexible An air tank 38 is connected via a hose 36 and an air valve 37, and an air pump 39 is connected to the air tank 38.

この装置の作用は上記の実施例と同様、コピースイッチ
によりエアポンプ３９が起動し、エアタンク３８内を十
分負圧にし、転写紙先端が感光体ドラムｌとローラ３３
の間に到達した時に常時は閉じているエア弁３７ヲ開き
、フレキシブルホース３６吸引箱３５ヲ介してエアタン
ク３８と連通ずる感光体ｌとの接点の近傍のパイプ３１
の内部を負圧とし、管壁の小孔よシ転写紙を吸引してベ
ルト３２の表面に吸着して搬送する。転写紙の先端が図
示せぬ搬送コロ等の搬送手段に到達すればエア弁３７が
閉じる。The operation of this device is the same as in the above embodiment, when the air pump 39 is started by the copy switch and the inside of the air tank 38 is sufficiently negative pressure, so that the leading edge of the transfer paper is connected to the photoreceptor drum l and the roller 33.
When the air valve 37, which is normally closed, is opened, the pipe 31 near the point of contact with the photoreceptor 1 communicates with the air tank 38 via the flexible hose 36 and the suction box 35.
A negative pressure is applied to the inside of the tube, and the transfer paper is sucked through the small holes in the tube wall, adsorbed onto the surface of the belt 32, and conveyed. When the leading edge of the transfer paper reaches a conveying means such as a conveying roller (not shown), the air valve 37 is closed.

以上述べた２つの実施例に示す如く、常時駆動されてい
るエアポンプにより負圧に保持されたエアタンクを常時
は閉じているエア弁を介して分離部に設けた吸引手段に
接続し、シートがその部分に到達した後僅かの時間エア
弁を開くことにより、小さい吸気量のエアポンプで必要
時大きな吸引力を発揮させることができる。As shown in the two embodiments described above, an air tank maintained at a negative pressure by an air pump that is constantly driven is connected to a suction means provided in the separation section via an air valve that is normally closed, and the seat is By opening the air valve for a short time after reaching the target area, a large suction force can be exerted when necessary using an air pump with a small suction amount.

上記の実施例は感光体ドラムから転写紙を分離する場合
の例であるが、本発明はこれ以外に例えば三色重ね合せ
方式のカラー複写機における転写ドラムからの転写紙の
分離その他の静電力等により支持体に密着するシート状
部材の支持体からの分離に有効に使用することができる
。The above embodiment is an example in which a transfer paper is separated from a photoreceptor drum, but the present invention is also applicable to separation of a transfer paper from a transfer drum in a color copying machine using a three-color superimposition system, and other electrostatic forces. It can be effectively used to separate a sheet-like member that is in close contact with a support from the support.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の実施例を示す断面図、第２図は本発明
の他の実施例を示す断面図、第３図はその斜視図である
。 ｌ・・・支持体（感光体ドラム）　ｔｏ、２０・・・分
離装置１６．３１・・・吸引手段　　　１８．３７・・
・エア弁１９．３８・・・エアタンク　　２０．３９・
・・エアポンプＳ・・・ノート状部材FIG. 1 is a sectional view showing an embodiment of the invention, FIG. 2 is a sectional view showing another embodiment of the invention, and FIG. 3 is a perspective view thereof. l... Support (photosensitive drum) to, 20... Separation device 16.31... Suction means 18.37...
・Air valve 19.38...Air tank 20.39・
・・Air pump S・Note-like member

Claims (1)

【特許請求の範囲】[Claims] 支持体上に静電気等の力で密着しているシート状部材を
、その背面の気圧を小さくして上記支持体から分離する
分離装置において、上記シート状部材の支持体からの分
離位置に接して又は近接して設けられた吸引手段と、該
吸引手段に接続され常時エアポンプによシ吸引されるエ
アタンクと、上記吸引手段と上記エアタンクを接続する
管路に設けられ常時は閉鎖し上記シート状部材の先端部
が上記分離位置に到達した際暫時開くエア弁とを有する
ことを特徴とする分離装置。In a separation device that separates a sheet-like member that is in close contact with a support by force such as static electricity from the support by reducing the air pressure on the back side of the sheet-like member, the sheet-like member is in contact with the separation position from the support. or a suction means provided in close proximity, an air tank connected to the suction means and constantly sucked by an air pump, and the sheet-like member provided in a conduit connecting the suction means and the air tank and closed at all times. and an air valve that opens momentarily when the tip of the separation device reaches the separation position.