JP2646566B2 - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JP2646566B2 JP2646566B2 JP62193585A JP19358587A JP2646566B2 JP 2646566 B2 JP2646566 B2 JP 2646566B2 JP 62193585 A JP62193585 A JP 62193585A JP 19358587 A JP19358587 A JP 19358587A JP 2646566 B2 JP2646566 B2 JP 2646566B2
- Authority
- JP
- Japan
- Prior art keywords
- thin film
- film member
- developing roller
- contact
- developing device
- 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
Landscapes
- Dry Development In Electrophotography (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、電子写真複写機、およびプリンター等に使
用される現像装置、さらに詳しくは、静電潜像担持体に
対する接触および非接触を容易に切り替えることのでき
る一成分現像剤を用いた現像装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device used for an electrophotographic copying machine and a printer, and more particularly, to easily switch between contact and non-contact with an electrostatic latent image carrier. And a developing device using a one-component developer.
従来の技術 電子写真複写機、およびプリンターにおいては静電潜
像の形成された感光体などの静電潜像担持体に現像装置
により帯電トナーを供給して現像を行う。2. Description of the Related Art In an electrophotographic copying machine and a printer, a developing device supplies charged toner to an electrostatic latent image carrier such as a photoconductor on which an electrostatic latent image is formed to perform development.
このような現像装置のうち現像ローラが感光体に接触
しながらトナーを供給する接触現像方式を用いて、多色
現像あるいは画像の色（トナー）の切替を行う場合、感
光体の周りに現像装置を複数設置してこれを切り替え
る。かかる装置において、同時に２つ以上の現像装置が
感光体に接触していると、画像の混色が生じたり、ある
いは現像スリーブ、現像装置への他のトナーの混入が生
ずる。When multi-color development or switching of image color (toner) is performed by using a contact developing method of supplying toner while a developing roller is in contact with a photoconductor, a developing device is provided around the photoconductor. And switch between them. In such an apparatus, if two or more developing devices are in contact with the photoconductor at the same time, color mixing of images occurs, or other toner is mixed into the developing sleeve and the developing device.
このため、従来は現像を行っている現像装置のみを感
光体に接触させ、不必要な他の現像装置は感光体から後
退させて非接触としておく方法が採用されている。For this reason, conventionally, a method has been adopted in which only a developing device that is performing development is brought into contact with the photoconductor, and other unnecessary developing devices are retracted from the photoconductor and kept in non-contact.
また、単色の現像にあっても現像装置の交換による色
替え、あるいは保守作業時に現像装置を感光体の軸方向
に取り出す必要があり、このため一旦現像装置を感光体
から後退させ表面接触を解除する必要が生ずる。Even in the case of single-color development, it is necessary to remove the developing device in the axial direction of the photoconductor during color change by replacing the developing device, or during maintenance work. Need to be done.
発明が解決しようとする問題点 しかしながら、従来の現像装置において感光体と現像
装置の接触を解除するには、現像装置全体を感光体に対
して移動させており、装置の構造が簡単ではない。Problems to be Solved by the Invention However, in order to release the contact between the photosensitive member and the developing device in the conventional developing device, the entire developing device is moved with respect to the photosensitive member, and the structure of the device is not simple.
本発明は、現像装置−感光体間の接触、非接触を現像
装置全体を移動させることなく簡単な機構を用いて迅速
に行い得る現像装置を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a developing device capable of quickly performing contact and non-contact between a developing device and a photoreceptor using a simple mechanism without moving the entire developing device.
問題点を解決するための手段 すなわち、本発明は回転駆動する現像ローラ、該現像
ローラの周長に対し僅かの余剰周長を有するとともに磁
性体を含み前記現像ローラに外装された筒状の薄膜部
材、該薄膜部材を現像ローラの感光体対向面と略反対側
に密着させ薄膜部材の余剰部を感光体に接触させる薄膜
密着手段、および該現像ローラの感光体対向面にて前記
薄膜部材を吸引する現像ローラ内部に設けられた磁石を
有することを特徴とする現像装置を提供するものであ
る。Means for Solving the Problems That is, the present invention relates to a developing roller which is driven to rotate, a cylindrical thin film which has a slight extra peripheral length with respect to the peripheral length of the developing roller and includes a magnetic material and which is externally mounted on the developing roller. Member, a thin film contacting means for bringing the thin film member into close contact with the photosensitive member facing surface of the developing roller and bringing an excess portion of the thin film member into contact with the photosensitive member, and the thin film member on the photosensitive member facing surface of the developing roller. It is an object of the present invention to provide a developing device having a magnet provided inside a developing roller for sucking.
作用 本発明の装置では現像を行わない場合、現像ローラ内
の磁石により、感光体対向面の薄膜部材を現像ローラ表
面に吸引し感光体と現像装置との間に間隙を形成する。When the developing is not performed in the apparatus of the present invention, the thin film member on the photosensitive member facing surface is attracted to the developing roller surface by the magnet in the developing roller to form a gap between the photosensitive member and the developing device.
実施例 つぎに、本発明を実施例により図面を参照しながらさ
らに具体的に説明する。EXAMPLES Next, the present invention will be described more specifically with reference to the drawings by using examples.
第１図は本発明の現像装置１を示す断面図である。現
像装置１は矢印ａ方向に回転駆動する感光体100に隣接
して配置される。現像装置１は周長の僅かに長い筒状の
ニッケル電鋳膜（膜厚40μｍ）からなる薄膜部材２を外
装した現像ローラ３、該現像ローラ３内に配置された略
半円形の磁石４、前記薄膜部材に先端が当接しトナーの
帯電および薄膜規制を行う規制ブレード５、感光体100
と薄膜部材が接触する現像領域の後方にて薄膜部材に摺
接し現像後の残存トナーをクリーニングするイレーサー
６、およびこれらを収容しトナーを貯溜するケーシング
７を有する。ケーシング７には、トナー貯槽８が設けら
れる。該トナー貯槽８には矢印ｃ方向に回転する二基の
アジテータ９、10が設けられ、内部に貯溜されたトナー
Toのブロッキングを防止しつつ矢印ｃ方向への移動を行
う。FIG. 1 is a sectional view showing the developing device 1 of the present invention. The developing device 1 is disposed adjacent to the photoconductor 100 that is driven to rotate in the direction of arrow a. The developing device 1 includes a developing roller 3 having a thin film member 2 formed of a cylindrical nickel electroformed film (thickness: 40 μm) having a slightly longer circumference, a substantially semicircular magnet 4 disposed in the developing roller 3, A regulating blade 5 whose leading end abuts on the thin film member to charge the toner and regulate the thin film;
An eraser 6 that slides on the thin film member behind the development area where the thin film member comes into contact with the thin film member and cleans residual toner after development, and a casing 7 that stores these and stores the toner. The casing 7 is provided with a toner storage tank 8. The toner storage tank 8 is provided with two agitators 9 and 10 that rotate in the direction of the arrow c.
Movement in the direction of arrow c is performed while preventing blocking of To.
現像機の作動時、略半円形の磁石４は感光体100に最
も遠い作動位置に停止する。ここで磁石４、規制ブレー
ド５およびイレーサー６は、感光体対向面と略反対側の
現像ローラ３の略半周にわたり薄膜部材２を密着させる
薄膜密着手段であり、その吸引力あるいは現像ローラに
伴い回転する薄膜部材との摩擦力により薄膜部材の余剰
部を形成し、これを感光体表面に接触させる。When the developing machine operates, the substantially semicircular magnet 4 stops at the operation position farthest from the photoconductor 100. Here, the magnet 4, the regulating blade 5, and the eraser 6 are thin film contact means for bringing the thin film member 2 into close contact with substantially half the circumference of the developing roller 3 on a side substantially opposite to the photosensitive member facing surface. A surplus portion of the thin film member is formed by a frictional force with the thin film member to be formed, and this is brought into contact with the surface of the photoconductor.
すなわち、現像ローラ３の外周面と薄膜部材２の内周
面との摩擦係数をμ1,薄膜部材２の外周面と規制ブレー
ド５またはイレーサ６との摩擦係数をμ２とすると、μ
１》μ２の関係が付与されており、現像ローラ３が矢印
ｂ方向に回転すると、これに伴い薄膜部材２も同方向に
移動する。That is, if the friction coefficient between the outer peripheral surface of the developing roller 3 and the inner peripheral surface of the thin film member 2 is μ 1 , and the friction coefficient between the outer peripheral surface of the thin film member 2 and the regulating blade 5 or the eraser 6 is μ 2 ,
1 "mu and 2 relationship is applied, the developing roller 3 rotates in the direction of the arrow b, the thin film member 2 Accordingly also moves in the same direction.
また、磁石４は外面が現像ローラ３の内面に沿う略半
円形をなし、その外面に複数の極を備える。該磁石４は
現像装置の作動時、第１図ａに示すような感光体との近
接領域とは最も離れた位置に停止して薄膜部材２の略半
分を現像ローラ３の表面に密着させ、一方、現像装置の
休止時には第１図ｂに示すごとく、これから180度回転
して感光体との近接領域に最も近い休止位置に停止す
る。The outer surface of the magnet 4 has a substantially semicircular shape along the inner surface of the developing roller 3, and the outer surface has a plurality of poles. When the developing device is operated, the magnet 4 is stopped at a position farthest from a region close to the photosensitive member as shown in FIG. 1A, and approximately half of the thin film member 2 is brought into close contact with the surface of the developing roller 3, On the other hand, when the developing device is at rest, as shown in FIG. 1B, the developing device is rotated by 180 degrees and stopped at the rest position closest to the area close to the photoconductor.
なお、内部磁石の位置変移を現像ローラの回転に周期
して動作させるとローラ停止時に動作させるよりもスム
ーズな弛みの位置、状態変化が達成できる。また、イレ
ーサー６は薄膜部材２のタルミの位置が変化するとき、
タルミ部が大きな抵抗なしに通過し得るよう設定されて
いる。When the position change of the internal magnet is operated in synchronization with the rotation of the developing roller, a smoother slack position and change in state can be achieved than when the operation is performed when the roller is stopped. Further, when the position of the tarmi of the thin film member 2 changes, the eraser 6
It is set so that the tarmi portion can pass without large resistance.
本発明現像装置の現像ローラは、ブラスト処理して粗
面化したアルミニウム等の金属で形成したもの、また金
属芯に導電性を付与したゴム、プラスチック等が被覆さ
れているものでもよく、現像バイアス電圧が印加され
る。The developing roller of the developing device of the present invention may be a roller formed of a metal such as aluminum blasted and roughened, or a metal core coated with rubber, plastic or the like having conductivity, and a developing bias. A voltage is applied.
また、薄膜部材は、現像ローラの周長に対し僅かに長
い周長を有しており、現像ローラの周りに外装されて僅
かの弛みを形成する。かかる薄膜部材の材質としては、
樹脂に金属微粉末等を添加したシート、ニッケル又はス
テンレス鋼等の金属薄膜、樹脂シートと金属薄膜とを積
層したシートなどが好ましい。Further, the thin film member has a circumferential length slightly longer than the circumferential length of the developing roller, and is formed around the developing roller to form a slight slack. As the material of such a thin film member,
A sheet obtained by adding a metal fine powder or the like to a resin, a metal thin film such as nickel or stainless steel, a sheet obtained by laminating a resin sheet and a metal thin film, and the like are preferable.
また、規制ブレードの材質としては、磁性金属薄板材
料、またはステンレス鋼、リン青銅などの非磁性金属薄
板材料、テフロン、ナイロンなどのプラスチック材料、
またそれらを貼り合わせた複合材等、従来トナー層厚の
規制ブレードとして用いられている材料がいずれも好適
に用いられ、弾性を有する材料であるのが好ましい。か
かる材料は、プラス（＋）トナーに対しては、摩擦帯電
系列でより陰性の材料、マイナス（−）トナーに対して
は陽性の材料を用いるのが好ましい。例えば、プラスト
ナーに対しては、テフロンなどのフッ素樹脂のシートま
たはそのコーティング、マイナストナーに対してはナイ
ロンなどのポリアミド系のフィルムまたはそのコーティ
ングが好適である。As the material of the regulating blade, a magnetic metal sheet material, or a non-magnetic metal sheet material such as stainless steel and phosphor bronze, a plastic material such as Teflon and nylon,
Also, any material conventionally used as a toner layer thickness regulating blade, such as a composite material obtained by laminating them, is suitably used, and is preferably an elastic material. As such a material, it is preferable to use a material that is more negative in a triboelectric series for a positive (+) toner and a positive material for a negative (−) toner. For example, a sheet of a fluororesin such as Teflon or its coating is suitable for the plus toner, and a polyamide-based film such as nylon or its coating is suitable for the minus toner.
なお、本発明装置にて用いられるトナーとしては、い
わゆる一成分系の非磁性トナーが好適に用いられるが、
磁性トナーなどであってもよい。As the toner used in the present invention, a so-called one-component non-magnetic toner is preferably used.
It may be a magnetic toner or the like.
つぎに本発明装置を用いて現像を行なう場合の動作に
ついて第１図を用いて説明する。Next, the operation in the case of performing development using the apparatus of the present invention will be described with reference to FIG.
現像ローラ３およびアジテータ９、10は、駆動源（図
示せず）によって、それぞれ矢印（ｂ）、（ｃ）方向に
回転し、トナーToは矢印（ｃ）方向に強制的に移動させ
られる。一方、薄膜部材２は、現像ローラ３との摩擦力
により現像ローラ３と共に矢印（ｂ）方向に回転移動す
る。トナー貯槽８内のトナーToは薄膜部材２との接触及
び静電気力によって薄膜部材２の表面に付着し、矢印
（ｂ）方向へ搬送される。トナーToは、薄膜部材２の表
面に保持され、規制ブレード５の圧接部に達して、薄膜
部材２の表面上にて薄層状に均一に塗布されると共に、
所定の正または負の極性に摩擦帯電される。The developing roller 3 and the agitators 9 and 10 are rotated in the directions of arrows (b) and (c) by a driving source (not shown), and the toner To is forcibly moved in the direction of arrow (c). On the other hand, the thin film member 2 rotates in the direction of the arrow (b) together with the developing roller 3 due to the frictional force with the developing roller 3. The toner To in the toner storage tank 8 adheres to the surface of the thin film member 2 by contact with the thin film member 2 and electrostatic force, and is transported in the direction of the arrow (b). The toner To is held on the surface of the thin film member 2, reaches the pressure contact portion of the regulating blade 5, and is uniformly applied in a thin layer on the surface of the thin film member 2.
It is triboelectrically charged to a predetermined positive or negative polarity.
薄膜部材２上に自身の帯電による静電気力で保持され
た薄層トナーToは、さらに移動して感光体ドラム100と
の対向部（現像領域（Ｘ））に運ばれ、感光体ドラム10
0の表面に形成された潜像の表面電位と現像ローラ３に
印加されているバイアス電圧との電圧差に基づく電界に
より、感光体ドラム100の表面上の静電潜像に移動して
トナー像を形成し現像を行う。The thin-layer toner To held on the thin-film member 2 by the electrostatic force of its own charge moves further and is carried to a portion (developing area (X)) opposite to the photosensitive drum 100, and the photosensitive drum 10
The toner image is moved to the electrostatic latent image on the surface of the photosensitive drum 100 by an electric field based on the voltage difference between the surface potential of the latent image formed on the surface of the photosensitive drum 100 and the bias voltage applied to the developing roller 3. Is formed and development is performed.
ここで、感光体ドラム100と接する薄膜部材２は、現
像ローラ３との間に空間部Ｓを有しており現像ローラと
は非接触状態にあるため、薄膜部材２はそれ自身の鋼性
のみで感光体ドラム100にソフトに、適当なニップ幅に
てむらなく接触し、感光体ドラム100の静電潜像に対
し、均一なトナー像を形成する。また、感光体ドラム10
0の周速と薄膜部材２の速度との間に速度差もたせるこ
とも可能であり、一旦感光体ドラム100上に形成された
トナー像が薄膜部材の摺擦力等の物理力により破壊され
ることがない。Here, the thin film member 2 in contact with the photosensitive drum 100 has a space S between the thin film member 2 and the developing roller 3 and is in a non-contact state with the developing roller. , The photosensitive drum 100 is softly and evenly contacted with an appropriate nip width, and a uniform toner image is formed on the electrostatic latent image on the photosensitive drum 100. Also, the photosensitive drum 10
It is also possible to provide a speed difference between the peripheral speed of 0 and the speed of the thin film member 2, and the toner image once formed on the photosensitive drum 100 is destroyed by a physical force such as a sliding force of the thin film member. Nothing.
つぎに、現像領域Ｘにて薄膜部材２上に残留したトナ
ーToは引き続き薄膜部材２と共に矢印ｂ方向に搬送さ
れ、イレーサ６との間を通過する際に、現像領域Ｘで消
費されたトナーToの消費パターンが消去されて、表面残
留トナー層の均一化が図られる。Next, the toner To remaining on the thin film member 2 in the development region X is continuously transported together with the thin film member 2 in the direction of arrow b, and when passing through the eraser 6, the toner To consumed in the development region X is removed. Is eliminated, and the surface residual toner layer is made uniform.
つぎに、薄膜部材２表面にはアジテーター９、10の回
転により再びトナーToが供給され、ブレード５の圧接部
にて均一な帯電トナー薄層が形成され、再び前記の動作
を繰り返す。Next, the toner To is supplied again to the surface of the thin film member 2 by the rotation of the agitators 9 and 10, and a uniform thin charged toner layer is formed at the pressure contact portion of the blade 5, and the above operation is repeated again.
つぎに現像装置１により現像を行わない場合は、第１
図ｂに示すごとく、磁石４が180度回転して現像ローラ
の感光体対向面側に薄膜部材２を吸引密着し、感光体10
0との接触を解消する。なお、このとき薄膜部材２の余
剰部は磁石４と逆の方向に生ずる。Next, when development is not performed by the developing device 1, the first
As shown in FIG. 2B, the magnet 4 is rotated by 180 degrees, and the thin film member 2 is attracted and adhered to the photosensitive member facing surface side of the developing roller.
Eliminate contact with 0. At this time, the surplus portion of the thin film member 2 is generated in a direction opposite to that of the magnet 4.
第２図ａは参考例を示す概略断面図であり、現像中の
状態を示す。第２図ａの現像装置においては現像ローラ
３内の磁石４は現像ローラの内面に対して１極のみを対
向させている。したがって、薄膜密着手段は規制ブレー
ド５、イレーサー６および規制ブレード側に向いた磁石
４により形成される。すなわち現像ローラと薄膜部材と
の摩擦係数をμ１、イレーサーと薄膜部材の間の摩擦係
数をμ２、規制ブレード面と薄膜部材との間の摩擦係数
をμ３とすると、μ１＞μ２＞μ３に設定されている。
なお、トナー薄層が薄膜部材上に形成されると規制ブレ
ードおよびイレーサーと薄膜部材間の摩擦係数は変化す
るが前記μ１、μ２、μ３の間の大小関係は変わらな
い。また、規制ブレードの下部に位置する磁石４は薄膜
部材と現像ローラとの密着性を向上させブレード部での
薄膜部材の弛みを防止して安定した走行を確保する。FIG. 2a is a schematic sectional view showing a reference example, showing a state during development. In the developing device of FIG. 2A, only one pole of the magnet 4 in the developing roller 3 is opposed to the inner surface of the developing roller. Therefore, the thin film adhesion means is formed by the regulating blade 5, the eraser 6, and the magnet 4 facing the regulating blade. That is, assuming that the friction coefficient between the developing roller and the thin film member is μ 1 , the friction coefficient between the eraser and the thin film member is μ 2 , and the friction coefficient between the regulating blade surface and the thin film member is μ 3 , μ 1 > μ 2 It is set to> μ 3.
When the thin toner layer is formed on the thin film member, the coefficient of friction between the regulating blade and the eraser and the thin film member changes, but the magnitude relationship among the above μ 1 , μ 2 and μ 3 does not change. In addition, the magnet 4 located below the regulating blade improves the adhesion between the thin film member and the developing roller, prevents loosening of the thin film member at the blade portion, and ensures stable running.
つぎに、第２図ｂは第２図ａの現像装置が現像休止状
態にあるときを示す。磁石４は現像ローラの回動と同期
して約90度回転し感光体の方向に向く。したがって、近
接領域の余剰薄膜部材を現像ローラ３の表面に吸引密着
されて感光体100との間に空間を生じ、弛みは現像ロー
ラ下部のイレーサー前方に移動する。Next, FIG. 2b shows a state in which the developing device of FIG. 2a is in a development pause state. The magnet 4 rotates about 90 degrees in synchronization with the rotation of the developing roller, and turns toward the photoconductor. Therefore, the excess thin film member in the adjacent area is attracted to and adhered to the surface of the developing roller 3 to form a space between the photosensitive member 100 and the slack moves to the front of the eraser below the developing roller.
第３図ａはさらに他の参考例を示す概略断面図であ
る。第３図ａにおいて磁石は感光体対向面に向いた電磁
石12であり薄膜密着手段は規制ブレード５およびイレー
サー６により構成される。したがって現像中は第３図ａ
に示すごとく電磁石12が作動せず、感光体対向面におい
て薄膜部材２と現像ローラ３との間に空間Ｓを生じ、感
光体−薄膜部材間の接触が保たれる。FIG. 3a is a schematic sectional view showing still another reference example. In FIG. 3A, the magnet is an electromagnet 12 facing the photoreceptor facing surface, and the thin film adhesion means is constituted by a regulating blade 5 and an eraser 6. Therefore, FIG.
As shown in (1), the electromagnet 12 does not operate, and a space S is formed between the thin film member 2 and the developing roller 3 on the photoconductor facing surface, so that the contact between the photoconductor and the thin film member is maintained.
一方、非現像時は電磁石12が通電励磁状態となり第３
図ｂに示すごとく薄膜部材２を現像ローラの感光体対向
面に吸引して薄膜部材２と感光体100との間に空間を生
じ非接触となり、余剰の薄膜部材２は感光体対向面と逆
の面に生ずる。On the other hand, at the time of non-development, the electromagnet 12 is in an energized and excited state.
As shown in FIG. 2B, the thin film member 2 is attracted to the photosensitive member facing surface of the developing roller, and a space is formed between the thin film member 2 and the photosensitive member 100 so that the thin film member 2 becomes non-contact. Surface.
なお、第３図に示す参考例においても前記第２図に示
した参考例の場合と同様、各摩擦係数μ１、μ２、μ３
はμ１＞μ２＞μ３の関係を有する。In addition, in the reference example shown in FIG. 3, similarly to the case of the reference example shown in FIG. 2, each of the friction coefficients μ 1 , μ 2 , μ 3
Has a relationship of μ 1 > μ 2 > μ 3 .
第４図は本発明の現像装置２基を感光体の周囲に配置
した場合を示す概略断面図である。第１の現像装置21は
磁石４が感光体対向側に向き、薄膜部材２を現像ローラ
３に吸引密着させて感光体100との接触を断っている。
一方、第２の現像装置23は磁石４が感光体と反対側に向
いて薄膜部材２を現像ローラ３に吸引密着し、現像ロー
ラ３の感光体対向面に薄膜部材２の余剰部を生じ感光体
100と接触して現像を行なう。FIG. 4 is a schematic sectional view showing a case where two developing devices of the present invention are arranged around a photoreceptor. In the first developing device 21, the magnet 4 is directed to the side facing the photoreceptor, and the thin film member 2 is brought into close contact with the developing roller 3 by suction so as to cut off the contact with the photoreceptor 100.
On the other hand, in the second developing device 23, the magnet 4 is directed to the opposite side to the photoreceptor, and the thin film member 2 is attracted to and adhered to the developing roller 3, so that an excess portion of the thin film member 2 is formed on the photoreceptor facing surface of the developing roller 3, and body
Develop with contact with 100.
発明の効果 本発明の現像装置によれば、現像装置−感光体間の接
触、非接触が、現像装置全体を移動させることなく簡単
かつ迅速に行い得る。According to the developing device of the present invention, contact and non-contact between the developing device and the photoreceptor can be performed easily and quickly without moving the entire developing device.
第１図a,bは本発明現像装置の一具体例を示す概略断面
図、第２図a,bおよび第３図a,bは参考例を示す概略断面
図、第４図は本発明現像装置を感光体の周りに２基設置
したところを示す概略断面図である。 図中の主な符号は、つぎのとおりである。 1:現像装置、2:薄膜部材、3:現像ローラ、4:磁石、5:規
制ブレード、6:イレーサー、12:電磁石。1a and 1b are schematic sectional views showing a specific example of the developing device of the present invention, FIGS. 2a and 2b and 3a and 3b are schematic sectional views showing a reference example, and FIG. FIG. 4 is a schematic cross-sectional view showing two devices installed around a photoconductor. The main symbols in the figure are as follows. 1: developing device, 2: thin film member, 3: developing roller, 4: magnet, 5: regulating blade, 6: eraser, 12: electromagnet.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山本 雅史 大阪府大阪市東区安土町２丁目30番地 大阪国際ビル ミノルタカメラ株式会社 内 (56)参考文献 実開 昭58−159552（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masafumi Yamamoto 2-30 Azuchicho, Higashi-ku, Osaka-shi, Osaka Inside the Osaka International Building Minolta Camera Co., Ltd. (56) References Japanese Utility Model 1983-159552 (JP, U)
Claims (1)
るとともに磁性体を含み前記ローラに外装された筒状の
薄膜部材、並びに （iii）現像ローラ内部に設けられ、作動位置又は休止
位置にて停止する回転可能な磁石を含む薄膜密着手段を
有し、 前記作動位置にて、磁石が感光体との近接位置より最も
離れた位置に停止して、該磁石に近接している現像ロー
ラの表面に薄膜部材を密着させると共に、薄膜部材の余
剰部を感光体に接触させ、 前記休止位置にて、磁石が感光体近接領域に停止して、
該磁石に近接している現像ローラの表面に薄膜部材を密
着させて薄膜部材を感光体より離反させる ことを特徴とする現像装置。(1) a developing roller that is driven to rotate; (ii) a cylindrical thin film member that has a slight extra peripheral length with respect to the peripheral length of the developing roller and that includes a magnetic material and is externally mounted on the roller; (Iii) thin-film contact means including a rotatable magnet provided inside the developing roller and stopped at an operation position or a rest position, wherein the magnet is farthest from a position close to the photoconductor at the operation position. Stopped at the position, the thin film member is brought into close contact with the surface of the developing roller that is close to the magnet, and the excess portion of the thin film member is brought into contact with the photoconductor. Stop,
A developing device, wherein a thin film member is brought into close contact with a surface of a developing roller close to the magnet to separate the thin film member from a photoreceptor.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62193585A JP2646566B2 (en) | 1987-07-31 | 1987-07-31 | Developing device |
| US07/225,465 US4907032A (en) | 1987-07-31 | 1988-07-28 | Monocomponent developing device |
| DE3825921A DE3825921A1 (en) | 1987-07-31 | 1988-07-29 | SINGLE COMPONENT DEVELOPMENT DEVICE |
| US07/468,235 US5008708A (en) | 1987-07-31 | 1990-01-22 | Monocomponent developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62193585A JP2646566B2 (en) | 1987-07-31 | 1987-07-31 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6437577A JPS6437577A (en) | 1989-02-08 |
| JP2646566B2 true JP2646566B2 (en) | 1997-08-27 |
Family
ID=16310430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62193585A Expired - Lifetime JP2646566B2 (en) | 1987-07-31 | 1987-07-31 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2646566B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5082453A (en) * | 1991-05-16 | 1992-01-21 | Siemens-Pacesetter, Inc. | Multi-contact connector system for an implantable medical device |
| JP5664227B2 (en) * | 2010-12-28 | 2015-02-04 | 富士ゼロックス株式会社 | Developing device and image forming apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58159552U (en) * | 1982-09-29 | 1983-10-24 | キヤノン株式会社 | magnetic brush developing device |
-
1987
- 1987-07-31 JP JP62193585A patent/JP2646566B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6437577A (en) | 1989-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2669421B2 (en) | One-component developing device | |
| US4907032A (en) | Monocomponent developing device | |
| US6711372B1 (en) | Developing apparatus | |
| JP2646566B2 (en) | Developing device | |
| JP2586499B2 (en) | Developing device | |
| JP2586501B2 (en) | Developing device | |
| JP2001265114A (en) | Developing machine | |
| JP2586500B2 (en) | Developing device | |
| US9377715B2 (en) | Developing unit and process cartridge | |
| JP2005309183A (en) | Image forming apparatus | |
| JPH0527579A (en) | Developing device | |
| JP2001194901A (en) | Developing device | |
| JP2001034066A (en) | Image forming device and developing device | |
| JP2920917B2 (en) | Developing device | |
| JP4033557B2 (en) | Image forming apparatus and control method thereof | |
| JPH07175318A (en) | Developing device and process cartridge | |
| JPH0450878A (en) | Developer carrier | |
| JPS58115462A (en) | Electrostatic latent image developing device | |
| JPS63278078A (en) | Developing device | |
| JPH1039599A (en) | Developing device | |
| JPH0427981A (en) | Developer carrying member | |
| JPH04318574A (en) | Developing device | |
| JPH0561357A (en) | Image forming device | |
| JPS6120965A (en) | Developing device | |
| JPH05297705A (en) | Image forming device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080509 Year of fee payment: 11 |