JPH08137288A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH08137288A JPH08137288A JP6295598A JP29559894A JPH08137288A JP H08137288 A JPH08137288 A JP H08137288A JP 6295598 A JP6295598 A JP 6295598A JP 29559894 A JP29559894 A JP 29559894A JP H08137288 A JPH08137288 A JP H08137288A
- Authority
- JP
- Japan
- Prior art keywords
- photoconductor
- photoreceptor
- lubricant
- brush
- transfer paper
- 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
Landscapes
- Cleaning In Electrography (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、転写紙を感光体から確
実に分離することができる画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus capable of reliably separating a transfer paper from a photoconductor.
【０００２】[0002]
【従来の技術】感光体に滑剤を塗布することによってク
リーニングブレードによる感光体上残留トナーのクリー
ニング性を向上させることは以前よりよく知られている
ことであり、この滑剤を感光体に塗布することによって
感光体上の地汚れが非常に少なくなることも確認されて
いる。このことは現像装置として２成分磁気ブラシ現像
を用いた時に非常に顕著である。2. Description of the Related Art It is well known in the art to improve the cleaning ability of a cleaning blade to remove residual toner on a photoconductor by applying a lubricant to the photoconductor. It has also been confirmed that the background stain on the photoconductor is significantly reduced. This is very remarkable when the two-component magnetic brush development is used as the developing device.
【０００３】これは感光体表面に滑剤を塗布することに
よって感光体表面の摩擦係数が低下するために、磁気ブ
ラシによるスキャベンジ効果が向上し、感光体上の地汚
れトナーを現像領域で掻き取ることができるためである
ことがわかっている。このため様々な滑剤や塗布方法、
タイミング等が報告されている。例えば、特開昭５６−
１５４７７８号公報および特開昭６０−１２５８７６号
公報参照。This is because the friction coefficient on the surface of the photoconductor is lowered by applying a lubricant to the surface of the photoconductor, so that the scavenging effect of the magnetic brush is improved, and the background toner on the photoconductor is scraped off in the developing area. It is known that it is possible to do. Therefore, various lubricants and coating methods,
Timing etc. are reported. For example, JP-A-56-
See JP-A-154778 and JP-A-60-125876.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うな滑剤を感光体に塗布すると上記のように感光体上の
地汚れが大幅に低減するため感光体と転写紙の密着度が
非常によくなってしまう。勿論転写紙を感光体から分離
するための分離手段として、コロナ放電器を用いた場合
に、その放電電流を多くすることによって分離性に余裕
度を持たせようとすることはできるが、今度は逆に転写
紙を部分的に過剰に除電してしまい、通常版画と呼ばれ
る転写紙からの感光体への再転写現象が発生することが
あるという問題点があった。However, when such a lubricant is applied to the photoconductor, the background stain on the photoconductor is greatly reduced as described above, so that the adhesion between the photoconductor and the transfer paper becomes very good. Will end up. Of course, when a corona discharger is used as a separating means for separating the transfer paper from the photoconductor, it is possible to increase the discharge current to give a margin to the separation property, but this time. On the contrary, there is a problem in that the transfer paper is partially excessively discharged, and a retransfer phenomenon from the transfer paper to the photoconductor, which is usually called a print, may occur.
【０００５】本発明は、このような従来の課題に鑑みて
なされたものであり、その目的とするところは、その第
一は感光体に滑剤を塗布する画像形成装置において、分
離余裕度を向上させための分離手段を提供することであ
り、またその第二は感光体に滑剤を塗布する画像形成装
置において、感光体から確実に転写紙を分離することの
できる感光体径及び感光体線速を提供することであり、
さらにその第三は感光体に滑剤を塗布する手段を持つ画
像形成装置において、感光体の残留電荷の除電を効果的
かつ小スペースで行うことのできる手段を提供すること
である。The present invention has been made in view of such conventional problems, and the first object thereof is to improve the separation margin in an image forming apparatus for applying a lubricant to a photoconductor. Secondly, in the image forming apparatus for applying a lubricant to the photoconductor, the diameter of the photoconductor and the linear velocity of the photoconductor that can surely separate the transfer paper from the photoconductor are provided. Is to provide
Thirdly, in an image forming apparatus having a means for applying a lubricant to the photoconductor, it is possible to provide a means capable of effectively removing the residual charge of the photoconductor in a small space.
【０００６】[0006]
【課題を解決するための手段】請求項１記載の発明に係
る画像形成装置は、感光体上の残留トナーを除去するた
めのクリーニングブレードの感光体回転方向からみて下
流側に配置され、感光体上に滑剤を塗布する手段と、転
写紙を前記感光体から分離するための手段とを具備し、
かつ前記分離手段が電圧を印加した針状電極であること
を特徴とするものである。According to another aspect of the present invention, there is provided an image forming apparatus, which is disposed downstream of a cleaning blade for removing residual toner on a photosensitive member in a rotational direction of the photosensitive member. A means for applying a lubricant thereon, and means for separating the transfer paper from the photoreceptor,
Moreover, the separating means is a needle-shaped electrode to which a voltage is applied.
【０００７】請求項２記載の発明は、上記構成に加え
て、前記感光体の直径が３０ｍｍ以下であり、かつ感光
体線速が３００ｍｍ／ｓｅｃ以下であることを特徴とす
るものである。In addition to the above construction, the invention according to claim 2 is characterized in that the diameter of the photoconductor is 30 mm or less and the linear velocity of the photoconductor is 300 mm / sec or less.
【０００８】更に、本発明の好ましい実施態様は、感光
体上に滑剤を塗布する手段が導電性部材で構成され、か
つ前記感光体と該導電性部材間の電荷移動開始電圧以上
の、感光体極性と逆極性のバイアス値が該部材に印加さ
れていることを特徴とするものである。Further, in a preferred embodiment of the present invention, the means for applying the lubricant onto the photoconductor is composed of a conductive member, and the charge transfer initiation voltage between the photoconductor and the conductive member is not less than the photoconductor. A bias value having a polarity opposite to the polarity is applied to the member.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。なお、実施例を説明するための全図において、同
一機能を有するものは同一符号を付け、その繰り返しの
説明は省略する。図１は、本発明の一実施例を示す画像
形成装置（電子写真記録機）の概略構成図である。符号
１は感光体ドラムで時計方向に回転する。該感光体ドラ
ム１の周囲には帯電器２、書き込み手段３、現像器４、
転写装置５、分離手段６、クリーニングブレード７、塗
布ブラシ８、滑剤ブロック９がこの順に配置されてい
る。Embodiments of the present invention will be described below with reference to the drawings. In all the drawings for describing the embodiments, components having the same function are denoted by the same reference numerals, and their repeated description will be omitted. FIG. 1 is a schematic configuration diagram of an image forming apparatus (electrophotographic recording machine) showing an embodiment of the present invention. Reference numeral 1 is a photosensitive drum that rotates clockwise. Around the photosensitive drum 1, a charger 2, a writing unit 3, a developing unit 4,
The transfer device 5, the separating means 6, the cleaning blade 7, the coating brush 8, and the lubricant block 9 are arranged in this order.
【００１０】ここで感光体１は有機光電体（ＯＰＣ）か
らなり、直径３０ｍｍのドラム形状を呈しており、現像
器４は２成分磁気ブラシ現像装置であり、帯電器２はス
コロトロンＣＨ帯電装置を使用し、塗布ブラシ８は直径
１０ｍｍの導電性繊維製の円筒状植毛ブラシで、感光体
ドラム１と逆方向に回転し、かつバイアス印加される方
式のものである。The photosensitive member 1 is made of an organic photoelectric material (OPC) and has a drum shape with a diameter of 30 mm. The developing device 4 is a two-component magnetic brush developing device and the charging device 2 is a scorotron CH charging device. The coating brush 8 used is a cylindrical flocking brush made of conductive fiber and having a diameter of 10 mm, which rotates in the opposite direction to the photosensitive drum 1 and is applied with a bias.
【００１１】感光体１が回転を始めるとまず帯電手段２
により感光体１はある一定の電位に帯電される。次い
で、書き込み手段３により感光体１上に潜像が書き込ま
れ、該潜像を現像手段４により顕像化する。When the photoconductor 1 starts to rotate, first the charging means 2
As a result, the photoconductor 1 is charged to a certain potential. Then, the latent image is written on the photoconductor 1 by the writing unit 3, and the latent image is visualized by the developing unit 4.
【００１２】次いで、この顕像を転写紙に転写装置５に
よって転写し、分離手段６により分離する。感光体１上
に残留しているトナーはクリーニングブレード７によっ
て掻き落とされる。クリーニングブレード７の下流側に
は回転するブラシ８が当接しており、ブラシ８近傍に設
けられた滑剤９を摺擦するようになっている。ブラシ８
の回転に伴ってブラシ先端に滑剤９が付着し、それを感
光体１に塗布している。この滑剤９としては様々なもの
が考えられるが、本発明ではステアリング酸亜鉛のブロ
ック９を用いている。ここで分離手段６としては通常コ
ロナワイヤが用いられるのであるが、本発明では針状電
極１２を用いている。Next, this visible image is transferred onto a transfer paper by a transfer device 5 and separated by a separating means 6. The toner remaining on the photoconductor 1 is scraped off by the cleaning blade 7. A rotating brush 8 is in contact with the downstream side of the cleaning blade 7, and a lubricant 9 provided near the brush 8 is rubbed. Brush 8
The lubricant 9 adheres to the tip of the brush as it rotates, and is applied to the photoconductor 1. Although various lubricants can be considered as the lubricant 9, the zinc stearate block 9 is used in the present invention. Here, a corona wire is usually used as the separating means 6, but in the present invention, the needle electrode 12 is used.
【００１３】通常感光体１表面に滑剤９を塗布しない場
合には感光体１と転写紙の間にはトナーが存在しており
（トナーの極性は必ずしもトナーの正規極性とは限らな
い）、感光体１と転写紙が完全に密着することは無いた
め、分離手段６として放電領域の広いコロナワイヤ１１
を用いても分離余裕度は非常に高い。しかしながら滑剤
９が塗布されている場合には転写紙と感光体１が完全に
密着してしまうため分離余裕度は非常に低くなってしま
う。Normally, when the lubricant 9 is not applied to the surface of the photoconductor 1, toner exists between the photoconductor 1 and the transfer paper (the polarity of the toner is not always the normal polarity of the toner), and Since the body 1 and the transfer paper do not completely adhere to each other, the corona wire 11 having a wide discharge area is used as the separating means 6.
The separation margin is very high even when using. However, when the lubricant 9 is applied, the transfer paper and the photoconductor 1 are completely brought into close contact with each other, so that the separation margin becomes very low.
【００１４】図２に示すように分離手段６としてコロナ
ワイヤ１１を用いると、その感光体１に対する放電領域
は広くなってしまい、これにより転写紙の場所によって
転写紙が受ける電荷が異なってしまい、又転写紙の分離
ポイント１３も安定しない。このため転写紙は分離不良
となったり、版画が発生したりと非常に不安定になって
しまう。When the corona wire 11 is used as the separating means 6 as shown in FIG. 2, the discharge area for the photoconductor 1 is widened, so that the charge received by the transfer paper varies depending on the location of the transfer paper. Also, the separation point 13 of the transfer paper is not stable. For this reason, the transfer paper becomes very unstable, such as separation failure or generation of a print.
【００１５】一方、図１，図３に示すように針状電極１
２を用いた場合は感光体（転写紙）に対する放電領域は
非常に制限されるため、分離ポイント１３が非常に安定
して得られる。また、この時に針状電極１２と感光体１
との距離は５〜１０ｍｍに設定するのが望ましい。５ｍ
ｍより近いと放電領域がスポット状に顕在化してしま
い、また、１０ｍｍより遠いと印加する電圧が非常に高
くなってしまうためである。なお、図２および図３にお
いて斜線部分が放電領域である。On the other hand, as shown in FIGS. 1 and 3, the needle-shaped electrode 1
When 2 is used, the discharge area for the photoconductor (transfer paper) is very limited, so that the separation point 13 can be obtained very stably. At this time, the needle-shaped electrode 12 and the photoconductor 1
It is desirable to set the distance between and to 5 to 10 mm. 5m
This is because the discharge region becomes apparent in a spot shape when the distance is closer than m, and the applied voltage becomes extremely high when the distance is greater than 10 mm. The hatched portion in FIGS. 2 and 3 is the discharge region.
【００１６】分離手段６としてコロナワイヤ１１を用い
た場合と針状電極１２を用いた場合の分離性の違いを図
４に示す。感光体径は３０ｍｍ、線速は３００ｍｍ／ｓ
ｅｃとした。なお、分離電流は感光体１に対する電流値
が同じになるように設定した。更に感光体１に滑剤９を
塗布した場合には、感光体１の径と感光体線速による分
離性に表１のような関係かあることがわかった。ここで
テストに用いた用紙は４５Ｋ紙と呼ばれる薄紙である。
また分離手段は針状電極１である。FIG. 4 shows the difference in separability between the case where the corona wire 11 is used as the separating means 6 and the case where the needle electrode 12 is used. Photoconductor diameter is 30 mm, linear velocity is 300 mm / s
ec. The separation current was set so that the current value for the photoconductor 1 was the same. Further, when the lubricant 9 was applied to the photoconductor 1, it was found that the relationship between the diameter of the photoconductor 1 and the separability depending on the linear velocity of the photoconductor is as shown in Table 1. The paper used for the test here is a thin paper called 45K paper.
The separating means is the needle electrode 1.
【００１７】[0017]
【表１】 ○ 分離性、版画ともＯＫ △ 分離性、版画不安定[Table 1] ○ Separation and print are OK. △ Separation and print are unstable.
【００１８】[0018]
【発明の効果】請求項１記載の発明によれば、感光体に
滑剤を塗布することによって感光体と転写紙の密着性が
非常によくなったよな場合でも、分離手段として針状電
極を用いているために従来用いられているコロナワイヤ
に比べて分離性能を上げることができる。また、請求項
２記載の発明によれば、感光体に滑剤を塗布することに
よって転写紙と感光体の密着度が大幅にアップし、分離
性余裕度が著しく低下するが、画像形成装置の感光体径
を３０ｍｍ以下で感光体線速を３００ｍｍ／ｓｅｃ以下
とすることによって確実な分離性を確保することができ
る。更に、本発明の好ましい実施例態様によれば、感光
体に滑剤を塗布するブラシをクリーニングブレードの下
流側に設けかつ感光体極性と逆極性のバイアス値を印加
してなり、そのバイアス値が電荷移動開始電圧以上とし
たので、感光体上の残留電荷を除電することができるた
め、感光体上残留電荷を除電するための別手段を設ける
必要がなく、スペースを小さくできる。According to the first aspect of the present invention, the needle-shaped electrode is used as the separating means even when the adhesion between the photoconductor and the transfer paper is greatly improved by applying the lubricant to the photoconductor. Therefore, the separation performance can be improved as compared with the conventionally used corona wire. According to the second aspect of the present invention, by applying a lubricant to the photoconductor, the adhesion between the transfer paper and the photoconductor is significantly increased, and the separability margin is significantly reduced. When the body diameter is 30 mm or less and the photosensitive member linear velocity is 300 mm / sec or less, reliable separability can be secured. Further, according to a preferred embodiment of the present invention, a brush for applying a lubricant to the photoconductor is provided on the downstream side of the cleaning blade, and a bias value having a polarity opposite to that of the photoconductor is applied, and the bias value is a charge. Since the voltage is equal to or higher than the movement start voltage, the residual charge on the photoconductor can be eliminated, so that it is not necessary to provide another means for eliminating the residual charge on the photoconductor, and the space can be reduced.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の一実施例を示す画像形成装置の概略構
成図である。FIG. 1 is a schematic configuration diagram of an image forming apparatus showing an embodiment of the present invention.
【図２】コロナワイヤを使用する分離方式の説明図であ
る。FIG. 2 is an explanatory diagram of a separation method using a corona wire.
【図３】針状電極の使用する分離方式の説明図である。FIG. 3 is an explanatory diagram of a separation method using a needle electrode.
【図４】分離方式による分離性と版画ランクの相違を示
すグラフである。FIG. 4 is a graph showing the difference in separability and print rank depending on the separation method.
１ 感光体（ドラム） ２ 帯電器 ３ 書き込み手段 ４ 現像器 ５ 転写装置 ６ 分離手段 ７ クリーニングブレード ８ 塗布ブラシ ９ 滑剤（滑剤ブロック） １２ 針状電極 DESCRIPTION OF SYMBOLS 1 Photoconductor (drum) 2 Charging device 3 Writing means 4 Developing device 5 Transfer device 6 Separation means 7 Cleaning blade 8 Coating brush 9 Lubricant (lubricant block) 12 Needle electrode
Claims (2)
クリーニングブレードの感光体回転方向からみて下流側
に配置され、感光体上に滑剤を塗布する手段と、転写紙
を前記感光体から分離するための手段とを具備し、かつ
前記分離手段が電圧を印加した針状電極であることを特
徴とする画像形成装置。1. A cleaning blade for removing residual toner on a photoconductor is arranged on the downstream side of the photoconductor in the rotating direction of the photoconductor, and means for applying a lubricant on the photoconductor and the transfer paper are separated from the photoconductor. An image forming apparatus, characterized in that the separating means is a needle electrode to which a voltage is applied.
り、かつ感光体線速が３００ｍｍ／ｓｅｃ以下であるこ
とを特徴とする請求項１記載の画像形成装置。2. The image forming apparatus according to claim 1, wherein the photoconductor has a diameter of 30 mm or less, and the photoconductor linear velocity is 300 mm / sec or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6295598A JPH08137288A (en) | 1994-11-04 | 1994-11-04 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6295598A JPH08137288A (en) | 1994-11-04 | 1994-11-04 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08137288A true JPH08137288A (en) | 1996-05-31 |
Family
ID=17822706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6295598A Pending JPH08137288A (en) | 1994-11-04 | 1994-11-04 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08137288A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010164759A (en) * | 2009-01-15 | 2010-07-29 | Ricoh Co Ltd | Protective layer forming device, and image forming apparatus and process cartridge using the same |
-
1994
- 1994-11-04 JP JP6295598A patent/JPH08137288A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010164759A (en) * | 2009-01-15 | 2010-07-29 | Ricoh Co Ltd | Protective layer forming device, and image forming apparatus and process cartridge using the same |
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