JP2586500B2 - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JP2586500B2 JP2586500B2 JP62193587A JP19358787A JP2586500B2 JP 2586500 B2 JP2586500 B2 JP 2586500B2 JP 62193587 A JP62193587 A JP 62193587A JP 19358787 A JP19358787 A JP 19358787A JP 2586500 B2 JP2586500 B2 JP 2586500B2
- Authority
- JP
- Japan
- Prior art keywords
- developing roller
- developing
- thin film
- toner
- film member
- 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
- 239000010409 thin film Substances 0.000 claims description 40
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 description 17
- 108091008695 photoreceptors Proteins 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000004809 Teflon Substances 0.000 description 5
- 229920006362 Teflon® Polymers 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
Landscapes
- Dry Development 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、およびプリンターを用いて現像を行
うには静電潜像の形成された感光体などの静電潜像担持
体に現像装置を用いて帯電トナーを供給する。2. Description of the Related Art To perform development using an electrophotographic copying machine and a printer, charged toner is supplied to an electrostatic latent image carrier such as a photoconductor on which an electrostatic latent image is formed using a developing device.
このような現像装置のうち現像ローラが感光体表面に
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）の切替を行うに
は、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。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。Among such developing devices, using a contact developing method of supplying toner while a developing roller is in contact with the surface of a photoreceptor,
In order to perform multi-color development or switching of the color (toner) of an image, a plurality of developing devices are provided around the photoreceptor and are switched. In such a device, if two or more developing devices are in contact with the photoconductor at the same time, color mixing of images occurs,
Alternatively, another toner is mixed into the developing sleeve and the developing device. 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ユニット交換による
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。Further, even in the case of single-color development, it is necessary to take out the developing device in the axial direction of the photoconductor at the time of color change by replacing the developing unit or at the time of maintenance work. Therefore, the developing device is once retracted from the photoconductor and the surface contact is released. A need arises.
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
して移動させなければならず、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 must be moved with respect to the photosensitive member. Absent.
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、 （ｉ）回転駆動する現像ローラ、 （ii）該現像ローラの周長に対し僅かの余剰周長を有し
前記現像ローラに外装され現像ローラとの間に実質的に
滑りのない筒状の薄膜部材、 （iii）前記現像ローラの外面形状に略対応する断面弧
状の内面により前記薄膜部材上より現像ローラの両端外
周面の対応する部分を押圧し、現像ローラと同軸に前記
薄膜部材に従動して回転可能なガイド部材、及び （iv）該ガイド部材が前記薄膜部材を感光体と接触させ
る現像位置又は前記薄膜部材を感光体と接触させない非
現像位置に、ガイド部材を停止させる停止部材 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 provides: (i) a developing roller that is driven to rotate; and (ii) a developing roller that has a slight extra peripheral length relative to the peripheral length of the developing roller and is externally mounted on the developing roller. And (iii) the corresponding portions of the outer peripheral surfaces at both ends of the developing roller from above the thin film member by the inner surface having an arc-shaped cross section substantially corresponding to the outer shape of the developing roller. A guide member which presses and is rotatable coaxially with the developing roller and driven by the thin film member; and (iv) a developing position where the guide member brings the thin film member into contact with the photoreceptor or does not contact the thin film member with the photoreceptor. Another object of the present invention is to provide a developing device having a stop member for stopping a guide member at a non-development position.
作用 本発明の装置では、停止部材の動作により現像ローラ
上におけるガイド部材の位置が変わり現像ローラに外装
された薄膜部材の余剰部の位置が移動する。Operation In the apparatus of the present invention, the position of the guide member on the developing roller changes due to the operation of the stop member, and the position of the surplus portion of the thin film member provided on the developing roller moves.
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a,bは本発明の現像装置１を示す断面図、第２
図ａはその主要部を示す斜視図、第２図ｂはその側面図
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の両
端に、これと同軸にて回転可能に配置された一対のガイ
ド部材４、トナーの薄膜規制を行う規制ブレード５、現
像領域の後方にて薄膜部材に摺接するイレーサ６、およ
びこれらを収容しトナーを貯溜するケーシング17を有す
る。FIGS. 1a and 1b are sectional views showing a developing device 1 of the present invention.
Fig. A is a perspective view showing a main part thereof, and Fig. 2b is a side view thereof. The developing device 1 is a photoconductor that is driven to rotate in the direction of arrow a.
Located adjacent to 100. The developing device 1 has 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, and is rotatable coaxially with both ends of the developing roller 3. And a regulating blade 5 for regulating the thin film of the toner, an eraser 6 slidingly contacting the thin film member behind the developing area, and a casing 17 for accommodating these and storing the toner.
該ガイド部材４は、内面の形状が略現像ローラの外面
形状に対応し、現像ローラに外装された薄膜部材２の略
半周を押圧する押圧部4aおよびこれを現像ローラの軸に
回動自在に支持する支持板4bからなる。なお、押接部の
内面形状は、実質的に現像ローラの形状に対応しておれ
ばよく、一部不連続であってもよい。また、発泡ポリウ
レタンとポリエステルシート等の弾性複合シートを内面
にはりつける等、実質上薄膜部材を現像ローラに密着し
うる形状であればよい。また、密着面のスベリを良くす
るため押圧部内面にテフロン等フッ素系のテープを用い
ることも効果的である。The guide member 4 has an inner surface substantially corresponding to the outer surface shape of the developing roller, and a pressing portion 4a for pressing substantially a half circumference of the thin film member 2 externally mounted on the developing roller, and the guide portion 4 is rotatable about the axis of the developing roller. It consists of a supporting plate 4b for supporting. The shape of the inner surface of the pressing portion may substantially correspond to the shape of the developing roller, and may be partially discontinuous. Further, any shape may be used as long as the thin film member can be substantially brought into close contact with the developing roller, such as by attaching an elastic composite sheet such as a foamed polyurethane and polyester sheet to the inner surface. It is also effective to use a fluorine-based tape such as Teflon on the inner surface of the pressing portion in order to improve the smoothness of the contact surface.
さらに、第４図に示すごとく該ガイド部材４の各々外
方には現像ローラ３の軸に対して、回動自在な一対の側
板25が配置される。各側板25は現像ローラ３の軸に平行
な２つの凹部6a,6bを有し、該凹部内に側板25を貫通す
る停止部材であるピン7a,7bを有する。該ピン7a,7bは前
記凹部に収容されたバネ8a,8bにより外方（図中左方）
に付勢される。Further, as shown in FIG. 4, a pair of side plates 25 that are rotatable with respect to the axis of the developing roller 3 are disposed outside each of the guide members 4. Each side plate 25 has two concave portions 6a and 6b parallel to the axis of the developing roller 3, and has pins 7a and 7b as stop members penetrating the side plate 25 in the concave portions. The pins 7a and 7b are moved outward (left in the figure) by springs 8a and 8b housed in the recesses.
It is urged to.
前記各側板25のさらに外方には各々カム板９が現像ロ
ーラ軸に対して回動自在にとりつけられ、ピン7a,7bの
進退を制御する。すなわち、第５図に示すごとく、該カ
ム板９の内側（現像ローラ側）は、ピン7a,または7bを
ガイド部材４に向け進行させる凸状カム面10aと、ピン7
a,または7bを後退させる凹状カム面10bとから形成さ
れ、ピンの進行位置にて各々ガイド部材の支持板4bの端
部に当接しガイド部材４の回転を止める。また、該カム
板９のさらに外方にはクラッチ板11、および該クラッチ
板11を吸引駆動する電磁コイル12が現像ローラ軸に取り
付けられる。A cam plate 9 is attached to the outside of each side plate 25 so as to be rotatable with respect to the developing roller shaft, and controls the advance and retreat of the pins 7a and 7b. That is, as shown in FIG. 5, the inner side (developing roller side) of the cam plate 9 has a convex cam surface 10a for advancing the pin 7a or 7b toward the guide member 4, and a pin 7a.
and a concave cam surface 10b for retreating the a or 7b, and abuts the end of the support plate 4b of the guide member at the position where the pin advances to stop the rotation of the guide member 4. Further, a clutch plate 11 and an electromagnetic coil 12 for attracting and driving the clutch plate 11 are attached to the developing roller shaft further outside the cam plate 9.
なお、ケーシング７には、トナー貯槽13が設けられ
る。該トナー貯槽13には各々矢印ｃおよびｄ方向に回転
するトナー供給羽根14およびアジテータ15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
トナーを移動させる。Note that the casing 7 is provided with a toner storage tank 13. The toner storage tank 13 is provided with a toner supply blade 14 and an agitator 15 that rotate in the directions of arrows c and d, respectively.
The toner is moved while preventing blocking of the toner To stored inside.
したがって、第２図ａに示すごとく、押圧部4aにより
前記薄膜部材２が現像ローラ３の周囲に密着し、感光体
ドラム対向面に設けられたガイド部材の開口部に薄膜部
材２の弛みが集中して一定の空間部（Ｓ）が形成され、
感光体100と薄膜部材２との接触が生ずる。Accordingly, as shown in FIG. 2A, the thin film member 2 is brought into close contact with the periphery of the developing roller 3 by the pressing portion 4a, and the slack of the thin film member 2 is concentrated on the opening of the guide member provided on the photosensitive drum facing surface. As a result, a certain space (S) is formed,
Contact between the photoconductor 100 and the thin film member 2 occurs.
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の外周面と圧接ローラ
５またはイレーサ６との摩擦係数をμ2とすると、μ1》
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 pressing roller 5 or the eraser 6 is μ 2 , μ 1 >>
The relationship of μ 2 is given, and when the developing roller 3 rotates in the direction of the arrow b, the thin film member 2 also moves in the same direction.
なお、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、
また金属芯にカーボン等で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 is formed of a metal such as aluminum which has been blasted and roughened,
Further, a metal core coated with rubber, plastic or the like provided with conductivity by carbon or the like may be applied, and a developing bias 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、
ポリカーボネート、ナイロン、テフロンなどを用いて軟
質の樹脂シート、樹脂にカーボン又は金属微粉末等を添
加したシート（30〜200μ）、ニッケル又はアルミニウ
ム、ステンレス鋼等の金属薄膜（30〜50μ）、前記樹脂
シートと金属薄膜とを積層したシートなどが好ましい。
これら材料のうち、特に樹脂材料を用いた場合、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エチレンテトラフル
オロエチレン共重合体（ETFE）、ポリテトラフルオロエ
チレン（PTFE）等のフッ素系樹脂材料、マイナストナー
に対してはナイロン等のポリアミド系樹脂材料が好適で
ある。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,
Soft resin sheet using polycarbonate, nylon, Teflon, etc., sheet (30-200μ) with carbon or metal fine powder added to resin, metal thin film (30-50μ) such as nickel or aluminum, stainless steel, etc. A sheet obtained by laminating a sheet and a metal thin film is preferable.
Among these materials, when a resin material is used, it is preferable to use a material that is more negative in the triboelectric series for the positive toner and a positive material for the negative toner. For example, a fluorine-based resin material such as ethylene tetrafluoroethylene copolymer (ETFE) and polytetrafluoroethylene (PTFE) is suitable for the plus toner, and a polyamide resin material such as nylon is suitable for the minus toner.
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、
テフロンゴム、シリコンゴム等軟弾性ゴム材料またそれ
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,
Any material conventionally used as a regulating blade for the toner layer thickness, such as a soft elastic rubber material such as Teflon rubber or silicone rubber or a composite material obtained by laminating them, is preferably used, and is preferably a material having elasticity. . As such a material, it is preferable to use a material that is more negative in the triboelectric series for the positive (+) toner and a positive material for the negative (−) toner. For example, a sheet of a fluororesin such as Teflon or its coating is preferable for the plus toner, and a polyamide-based film such as nylon or its coating is preferable 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〜第３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 FIGS.
まず、第１図a,第２図a,bに示すごとく、現像時は上
部のピン7aが現像ローラ方向に進行し現像ローラ３と共
に矢印ｂ方向に回転しようとするガイド部材４の支持板
4bの端面を止めた状態で運転が行われる。したがって、
第１図ａに示すごとく、現像ローラ３は矢印（ｂ）方向
に、供給羽根14、およびアジテータ15は、矢印（ｃ）
（ｄ）方向に、それぞれ駆動源（図示せず）によって回
転し、トナーToが矢印（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
より現像ローラー３と共に矢印（ｂ）方向に回転移動す
る。トナー貯槽13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、層厚規
制および荷電の付与が行われる。First, as shown in FIGS. 1a, 2a and 2b, at the time of development, a support plate of a guide member 4 in which an upper pin 7a advances in the direction of the developing roller and tries to rotate together with the developing roller 3 in the direction of arrow b.
Operation is performed with the end face of 4b stopped. Therefore,
As shown in FIG. 1A, the developing roller 3 moves in the direction of arrow (b), and the supply blade 14 and the agitator 15 move in the direction of arrow (c).
The toner To is rotated in the direction (d) by a drive source (not shown), and the toner To is forcibly moved in the direction of the arrow (c). On the other hand, the thin film member 2 rotates and moves in the direction of the arrow (b) together with the developing roller 3 by the frictional force with the developing roller 3. The toner To in the toner storage tank 13 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 and reaches the pressure contact portion of the regulating blade 5, where regulation of the layer thickness and application of charge are performed.
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静電潜像電位と現像ローラ３に印
加されているバイアス電圧との電位差に基づく電界によ
り、感光体ドラム100の表面の静電潜像上に移動してト
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 on the electrostatic latent image on the surface of the photosensitive drum 100 by an electric field based on the potential difference between the electrostatic latent image potential formed on the surface of the photosensitive drum 100 and the bias voltage applied to the developing roller 3. Form and develop.
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。特に、薄膜部材２の速度を感光体ドラム
100の周速より大きく設定することにより画像濃度を増
加させることができ地肌カブリの除去に効果的である。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. In particular, the speed of the thin film member 2 is
By setting the peripheral speed higher than 100, the image density can be increased, which is effective in removing background fog.
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
留トナー層を均一化が図られる。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表面には再びトナー供給羽根14の
回転によりトナーToが供給され、前記の動作を繰り返
す。Next, the toner To is supplied to the surface of the thin film member 2 again by the rotation of the toner supply blade 14, and the above operation is repeated.
つぎに、現像装置１による現像を行わない場合は、第
１図ｂ、および第３図a,bに示すごとく、前記カム板９
の回転により上部ピン7aを後退させ、一方下部ピン7bを
現像ローラ側へ進行させ、かつ一定時間後に現像ローラ
ーの駆動を停止することによりガイド部材４が現像ロー
ラに伴ってほぼ180°回転して感光体100側に位置し、現
像ローラの感光体対向面と反対側に薄膜部材２の余剰部
を生じて、感光体100との接触を解消する。Next, when the developing by the developing device 1 is not performed, as shown in FIG. 1B and FIGS.
By rotating the upper pin 7a backward, the lower pin 7b is advanced to the developing roller side, and after a certain time, the driving of the developing roller is stopped, so that the guide member 4 rotates substantially 180 ° with the developing roller. An excess portion of the thin film member 2 is formed on the photoconductor 100 side and on the side opposite to the photoconductor-facing surface of the developing roller, and the contact with the photoconductor 100 is eliminated.
第６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
停止時上部ピンが後退すると共に下部ピンが進行してガ
イド部材４が感光体側に位置し、薄膜部材２と感光体10
0との接触を断っている。一方、第２の現像装置23は上
部ピンが前進し、下部ピンが後退することによりガイド
部材４が前記第１現像装置とは逆の位置に停止して現像
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. 6 is a schematic sectional view showing a case where two developing devices of the present invention are arranged around a photoreceptor. When the first developing device 21 is stopped, the upper pin retreats and the lower pin advances, so that the guide member 4 is located on the photoconductor side, and the thin film member 2 and the photoconductor 10
Contact with 0 has been refused. On the other hand, in the second developing device 23, when the upper pin moves forward and the lower pin moves backward, the guide member 4 stops at a position opposite to that of the first developing device, and a thin film is formed on the photosensitive member facing surface of the developing roller 3. A surplus portion of the member 2 is generated, and development is performed in contact with the photoreceptor 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
かつ迅速に行うことができる。したがって、混色なしに
トナーの切り換えを容易に行うことができ部分現像、分
割現像も容易となり、さらに、保守も簡単となる。According to the developing device of the present invention, contact and non-contact between the developing device and the photoconductor can be easily and quickly performed without moving the entire developing device. Therefore, the toner can be easily switched without color mixture, so that partial development and split development can be facilitated, and further, maintenance can be simplified.
【図面の簡単な説明】 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は各々現像時のガイド部材位置を示す斜
視図および側面図、第３図a,bは各々非現像時のガイド
部材位置を示す斜視図および側面図、第４図は本発明装
置のガイド部材付近を示す断面図、第５図はカム板を示
す斜視図、第６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:ガイド部
材、7a,7b:ピン。BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are schematic sectional views showing a specific example of the developing device of the present invention, and FIGS. 2a and 2b are perspective views and side views respectively showing the positions of guide members during development. 3a and 3b are a perspective view and a side view, respectively, showing the position of the guide member at the time of non-development, FIG. 4 is a sectional view showing the vicinity of the guide member of the apparatus of the present invention, FIG. 5 is a perspective view showing a cam plate, FIG. 6 shows the developing device of the present invention around the photoreceptor.
It is an outline sectional view showing the place where it installed base. The main symbols in the figure are as follows. 1: developing device, 2: thin film member, 3: developing roller, 4: guide member, 7a, 7b: pin.
───────────────────────────────────────────────────── 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 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masafumi Yamamoto 2-30 Azuchicho, Higashi-ku, Osaka-shi, Osaka Osaka International Building Minolta Camera Co., Ltd.
Claims (1)
前記現像ローラに外装され現像ローラとの間に実質的に
滑りのない筒状の薄膜部材、 （iii）前記現像ローラの外面形状に略対応する断面弧
状の内面により前記薄膜部材上より現像ローラの両端外
周面の対応する部分を押圧し、現像ローラと同軸に前記
薄膜部材に従動して回転可能なガイド部材、及び （iv）該ガイド部材が前記薄膜部材を感光体と接触させ
る現像位置又は前記薄膜部材を感光体と接触させない非
現像位置に、ガイド部材を停止させる停止部材 を有することを特徴とする現像装置。(I) a developing roller which is driven to rotate; and (ii) a developing roller which has a slight extra peripheral length with respect to the peripheral length of the developing roller and which is provided on the developing roller and substantially slides between the developing roller and the developing roller. (Iii) pressing the corresponding portions of the outer peripheral surfaces of both ends of the developing roller from above the thin film member with an arc-shaped inner surface substantially corresponding to the outer surface shape of the developing roller, and coaxially with the developing roller. A guide member rotatable following the thin film member, and (iv) stopping the guide member at a developing position where the guide member makes contact with the photoconductor or a non-developing position where the thin film member does not make contact with the photoconductor. A developing device, comprising: a stop member for stopping the developing device.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62193587A JP2586500B2 (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 |
|---|---|---|---|
| JP62193587A JP2586500B2 (en) | 1987-07-31 | 1987-07-31 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6437572A JPS6437572A (en) | 1989-02-08 |
| JP2586500B2 true JP2586500B2 (en) | 1997-02-26 |
Family
ID=16310455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62193587A Expired - Lifetime JP2586500B2 (en) | 1987-07-31 | 1987-07-31 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2586500B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6138832A (en) * | 1984-07-31 | 1986-02-24 | Mitsubishi Heavy Ind Ltd | Machine tool taking measure for heat |
| JPS61284337A (en) * | 1985-06-07 | 1986-12-15 | Hitachi Seiko Ltd | Construction for preventing machine tool from thermal deformation |
-
1987
- 1987-07-31 JP JP62193587A patent/JP2586500B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6437572A (en) | 1989-02-08 |
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