JPH04199164A - Color developing device - Google Patents
Color developing deviceInfo
- Publication number
- JPH04199164A JPH04199164A JP2333691A JP33369190A JPH04199164A JP H04199164 A JPH04199164 A JP H04199164A JP 2333691 A JP2333691 A JP 2333691A JP 33369190 A JP33369190 A JP 33369190A JP H04199164 A JPH04199164 A JP H04199164A
- Authority
- JP
- Japan
- Prior art keywords
- developing
- developing device
- roller
- developing roller
- color
- 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.)
- Granted
Links
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 239000010409 thin film Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000003825 pressing Methods 0.000 abstract description 4
- 108091008695 photoreceptors Proteins 0.000 description 17
- 238000010586 diagram Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
- Color Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はカラー現像装置、例えば、電子写真方式の複写
機、プリンタ、ファクシミリ等におけるカラー現像装置
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color developing device, for example, a color developing device used in an electrophotographic copying machine, printer, facsimile, or the like.
〔従来の技術及び発明が解決しようとする課題〕一般に
カラー複写機の現像装置は感光体のまわりに、イエロー
、マゼンタ、シアン、ブラック（以下、順にＹＳＭ、、
Ｃ，Ｂという）の順に各色の現像器を並置した並置型の
カラー現像装置と、感光体の近傍の回転体の軸のまわり
各色の現像ユニットを配置して回転しながら各現像ユニ
ットを感光体側に移動させる回転移動型（いわゆるリボ
ルバ一方式）のカラー現像装置とがある。この回転移動
型のカラー現像装置は、並置型のカラー現像装置に比較
し、感光体ドラムの小型化、装置の小型化ができ、メリ
ットが多い。[Prior Art and Problems to be Solved by the Invention] Generally, the developing device of a color copying machine has yellow, magenta, cyan, black (hereinafter, YSM,...
A side-by-side type color developing device in which developing units of each color are arranged side by side in the order of C and B), and a developing unit of each color is arranged around the axis of a rotating body near the photoconductor, and while rotating, each developing unit is placed on the side of the photoconductor. There is a color developing device of a rotational movement type (so-called revolver type) in which the color developing device is moved in a rotational manner. This rotary movement type color developing device has many advantages over a side-by-side type color developing device in that the photosensitive drum and the device can be made smaller.
従来の回転移動型のカラー現像装置としては、例えば、
特開昭６１−５９３７２号公報に記載された第５図に示
すようなものがある。このカラー現像装置１は感光体２
の近傍に回転移動ステイション３が設けられ、回転移動
ステイション３内の複数の現像器４ （図にはＢの現像
器のみ概略示している）を図示していないパルスモータ
により駆動する方法で現像器４を感光体２の方向に移動
させ現像ローラ５で現像するものである。Examples of conventional rotary movement type color developing devices include:
There is a device as shown in FIG. 5 described in Japanese Patent Application Laid-Open No. 61-59372. This color developing device 1 includes a photoreceptor 2
A rotationally movable station 3 is provided near the rotary movable station 3, and a plurality of developing devices 4 (only the developing device B is schematically shown in the figure) in the rotary movable station 3 are driven by a pulse motor (not shown). A developing device 4 is moved toward the photoreceptor 2 and a developing roller 5 performs development.
また、現像器４を感光体２側に移動させるのに、現像器
４を支持する回転支持体３の回転を利用してカム等で現
像器４を感光体側に移動させるものも考えられる。It is also conceivable to use a cam or the like to move the developing device 4 toward the photoreceptor 2 by utilizing the rotation of the rotating support 3 that supports the developing device 4.
しかしながら、これらのものは回転支持体に対して各現
像器を独立に構成し、かつ、感光体に対して現像器を移
動させる手段が必要であり、構成が複雑で、装置が大型
化しコストが高くなってしまう欠点があった。また、現
像器が移動する時、現像器内のトナーが落下し機内汚れ
、コピーの汚れの原因となるという問題点がある。However, in these systems, each developing device is configured independently relative to the rotating support, and a means for moving the developing device relative to the photoreceptor is required, resulting in a complicated structure, an increased size of the device, and increased costs. The drawback was that it was expensive. Another problem is that when the developing device is moved, toner inside the developing device falls, causing stains inside the device and staining copies.
また、前述の回転移動型のカラー現像装置において、弾
性を有する現像ローラ上にトナー薄層を形成し、現像ロ
ーラを感光体に接触させて現像を行う接触式の現像装置
では、長期にわたり感光体と現像ローラとが接触した状
態が続くと、現像ローラに歪が生じ、画像上に横スジ、
汚れ、画像抜は等が発生するという不具合があった。こ
の不具合に対して感光体から現像ローラを離隔するため
には、回転支持体、に対して各現像器を独立に構成する
必要があり、また、装置の大型化、コスト高につながっ
てしまうという問題点もある。In addition, in the above-mentioned rotary movement type color developing device, in the contact type developing device in which a thin toner layer is formed on the elastic developing roller and the developing roller is brought into contact with the photoreceptor to perform development, the photoreceptor remains in contact for a long period of time. If the developing roller continues to be in contact with the developing roller, distortion will occur in the developing roller, causing horizontal lines and
There were problems such as stains and image omissions. To solve this problem, in order to separate the developing roller from the photoreceptor, it is necessary to configure each developing device independently with respect to the rotating support, which also leads to an increase in the size and cost of the device. There are also problems.
接触式現像装置としては、特開昭６１−１．５１５６４
号公報に記載されたものがある。しかしながら、これに
は、イエロー現像器が現像位置に対して４５°下流側に
ある時を回転現像装置のホームポジションとし、コピー
シーケンス終了後にはホームポジションに復帰し、次の
サイクルを待機する。という記述があるが、現像ローラ
の変形防止を目的として、非現像時に、感光体に接触し
ない位置に回転支持体を回転移動させるという記述はな
されていない。As a contact type developing device, JP-A-61-1.51564
There is something described in the No. However, in this case, the rotary developing device sets the home position when the yellow developing device is 45° downstream from the developing position, returns to the home position after the copy sequence ends, and waits for the next cycle. However, for the purpose of preventing deformation of the developing roller, there is no description that the rotating support is rotated to a position where it does not come into contact with the photoreceptor during non-development.
また、近年、オフィスのカラー化に伴い、フルカラーコ
ピーも取れるオフィス用白黒複写機の要求が高まり、フ
ルカラーを得るだめのイエロー、マゼンタ、シアン３色
の現像器の他に黒トナーの現像器も装備した複写機が捉
案されている。しかしながら、現実的には一般オフィス
ではまだまだフルカラーコピーの使用頻度は低く、白黒
コピーの使用が圧倒的に多い。従って一般使用者にとっ
ては、極力白黒コピーが早く取れるものが望ましい。In addition, in recent years, as offices have become more color-oriented, there has been an increase in demand for office black-and-white copiers that can also make full-color copies.In addition to the yellow, magenta, and cyan developing units needed to make full-color copies, these machines are also equipped with a black toner developer. A photocopier is being investigated. However, in reality, full-color copies are still infrequently used in general offices, and black-and-white copies are overwhelmingly used. Therefore, for general users, it is desirable to be able to make black and white copies as quickly as possible.
従来の白黒およびフルカラー現像を装備した複写機とし
ては、特開昭６１−１５１５６４号公報に記載されたも
のがある。これには、イエロー現像器が現像位置に対し
て４５°下流側にある時を回転現像装置のホームポジシ
ョンとし、コピーシーケンス終了後にはホームポジショ
ンに復帰し、次のサイクルを待機する。という記述があ
るが、非現像時に、白黒複写を考慮した回転支持体の回
転方向最短上流側に黒現像剤を有する現像器が位置する
という記述はなされていない。A conventional copying machine equipped with black-and-white and full-color development is described in Japanese Patent Application Laid-Open No. 151564/1983. For this purpose, the rotary developing device is set at its home position when the yellow developing device is 45 degrees downstream from the developing position, and after the copy sequence is completed, the rotary developing device returns to the home position and waits for the next cycle. However, there is no description that during non-development, a developing device containing black developer is located at the shortest upstream side in the rotational direction of the rotating support in consideration of black-and-white copying.
そこで本発明は、このような従来技術の課題を背景にな
されたものであり、回転型のカラー現像装置で弾性を有
する現像ローラを回転支持体に対して相対位置を固定し
て支持させることにより、回転支持体の回転だけで現像
位置にて画像担持体と現像ローラの均一な接触ができ、
かつ、小型で、低コストで、トナー落ちが防止できるカ
ラー現像装置を提供することを目的とし、
また、前記に加え、非現像時には回転支持体の回転だけ
で、現像ローラを画像担持体に接触する接触位置から離
隔した離隔位置に移動させることにより、現像ローラの
歪を防止し、画像上の横スジ、汚れ、画像抜は等の発生
が防止できるカラー現像装置を提供することを目的とし
、
さらに、前記に加え、非現像時には、前記接触位置から
回転支持体の回転方向上流側の最短距離の前記離隔位置
は黒現像剤を有する現像ローラのくる位置とすることに
より、白黒コピーを取るとき、白黒用現像器の選択が小
さい慣性で衝撃なく迅速にでき、かつ正確にできるカラ
ー現像装置を提供することを目的とする。The present invention has been made against the background of such problems with the prior art, and it is possible to solve this problem by supporting an elastic developing roller in a rotary color developing device with its relative position fixed relative to a rotating support. , uniform contact between the image carrier and the developing roller can be achieved at the developing position simply by rotating the rotating support.
The purpose of the present invention is to provide a color developing device that is small, low cost, and can prevent toner from falling off.In addition to the above, the developing roller is brought into contact with the image carrier simply by rotating the rotating support during non-developing. The object of the present invention is to provide a color developing device which can prevent distortion of the developing roller by moving the developing roller to a separate position away from a contact position where the developing roller is in contact with the image forming apparatus, and can prevent the occurrence of horizontal lines, dirt, image omissions, etc. on the image. Furthermore, in addition to the above, when not developing, the distance position, which is the shortest distance upstream from the contact position in the rotational direction of the rotating support, is the position where the developing roller containing black developer is located, so that when making a black and white copy, To provide a color developing device which can quickly and accurately select a black and white developing device with small inertia and without impact.
本発明によるカラー現像装置は、上記目的達成のため、
請求項１では、画像担持体の回転中心軸線と平行に配設
された回転支持体に複数の現像器をそれぞれ支持させ、
所定の現像器を画像担持体に対向する現像位置に回動さ
せて現像を行うカラー現像装置において、前記現像器は
前記回転支持体の外周側に外周表面に現像剤の薄膜を形
成し画像担持体に接触して現像を行う現像ローラを有し
、該現像ローラは弾性を有し、前記回転支持体に対して
相対位置を固定して前記現像器に軸支されていることを
特徴としている。In order to achieve the above object, the color developing device according to the present invention has the following features:
According to a first aspect of the present invention, a plurality of developing units are each supported by a rotating support disposed parallel to a rotation center axis of an image carrier;
In a color developing device that performs development by rotating a predetermined developing device to a developing position facing an image carrier, the developing device forms a thin film of developer on the outer circumferential surface of the rotating support to carry the image. The developing roller has elasticity and is pivotally supported by the developing device with a fixed relative position to the rotating support. .
また、請求項２では、前記現像ローラは非現像時には画
像担持体に接触して現像する接触位置から離隔した離隔
位置に前記回転担持体により回転移動させられることを
特徴としている。According to a second aspect of the present invention, the developing roller is rotatably moved by the rotary carrier to a remote position away from a contact position where it contacts the image carrier and develops when not developing.
また、請求項３では、前記現像ローラの前記離隔位置は
前記接触位置から前記回転支持体の回転方向上流側の最
短距離に黒現像剤の薄膜を形成した現像ローラがくる位
置であることを特徴としている。According to a third aspect of the present invention, the separated position of the developing roller is a position where the developing roller on which a thin film of black developer is formed is located at the shortest distance from the contact position upstream in the rotational direction of the rotating support. It is said that
以下、本発明の実施例を図面に基づいて具体的に説明す
る。Embodiments of the present invention will be specifically described below based on the drawings.
第１〜３図は本発明の請求項１．２に係るカラー現像装
置の一実施例を示す図であり、カラー現像装置を適用し
た白黒・フルカラー兼用複写機のカラー現像装置の近傍
の概略を示す。1 to 3 are diagrams showing an embodiment of a color developing device according to claim 1.2 of the present invention, and schematically show the vicinity of the color developing device of a monochrome/full color copying machine to which the color developing device is applied. show.
まず、構成につき説明する。第１．２図において、１１
は画像担持体である感光体ドラムであり、感光体ドラム
１１の周辺には、時計回り方向に帯電チャージャ１２、
露光（図には実線にて示す）１３、本発明に係るカラー
現像装置１５、転写チャージャ１６、分離チャージャ１
７、クリーニングフ゛レード１８を有するクリーニング
ユニ・ット１９、が通常と同様に配置されている。２０
はレジストローラ、２１は転写紙であり、転写紙２１は
レジストローラ２０により転写チャージャ１６側に搬送
される。First, the configuration will be explained. In Figure 1.2, 11
is a photoreceptor drum which is an image carrier, and around the photoreceptor drum 11, a charger 12 is arranged in a clockwise direction;
Exposure (indicated by solid lines in the figure) 13, color developing device 15 according to the present invention, transfer charger 16, separation charger 1
7. A cleaning unit 19 having a cleaning blade 18 is arranged in the usual manner. 20
2 is a registration roller, and 21 is a transfer paper. The transfer paper 21 is conveyed to the transfer charger 16 side by the registration roller 20.
カラー現像装置１５は時計方向Ａに回転する感光体ドラ
ム１１の回転中心軸線Ｐと平行に配設され装置本体に支
持された支持軸２４に回転自在に軸支された回転支持体
２５を有している。回転支持体２５は、周方向に４つの
収納室２６を等分に有し、収納室２６内にはそれぞれＣ
，Ｙ、Ｍ、Ｂの現像剤を有する現像器２７Ｃ１２７Ｙ、
２７Ｍ、２７Ｂ（代表するときは２７という）を時計方
向に配置するように構成し支持している。現像器２７の
配列は図示の順序に限ったものではない。また、各現像
器２７内の構成は現像剤以外は同じであり、現像器２７
Ｃを代表して説明する。図には現像器２７Ｃ以外は一部
のみ示している。回転支持体２５は、装置本体に設けら
れた図示していない歯車を介してパルスモータにより駆
動され時計方向Ｂに回転する。、カラー現像装置１５は
前記パルスモータにより回転支持体２５を回転すること
により、現像時に、現像器２７Ｃを感光体ドラム１１に
対向する現像位置Ｑに回動させて感光体ドラム１１上の
潜像を現像させるようになされている。The color developing device 15 includes a rotating support 25 that is rotatably supported on a support shaft 24 that is disposed parallel to the rotation center axis P of the photosensitive drum 11 that rotates in the clockwise direction A and supported by the device main body. ing. The rotating support body 25 has four storage chambers 26 equally divided in the circumferential direction, and each of the storage chambers 26 has a C.
, Y, M, B developer 27C127Y,
27M and 27B (referred to as 27 when representing) are arranged and supported in a clockwise direction. The arrangement of the developing units 27 is not limited to the illustrated order. The configuration inside each developing device 27 is the same except for the developer, and the developing device 27
I will explain on behalf of C. In the figure, only a portion other than the developing device 27C is shown. The rotating support body 25 is driven by a pulse motor via a gear (not shown) provided in the main body of the device, and rotates in a clockwise direction B. , the color developing device 15 rotates the rotary support body 25 by the pulse motor to rotate the developing device 27C to a developing position Q facing the photosensitive drum 11 during development, thereby forming a latent image on the photosensitive drum 11. It is designed to develop.
現像器２７Ｃは、回転支持体２５の中心側に現像剤であ
るシアン現像剤３０Ｃ（代表するときは３０という）を
回転しながらゆっくりと攪拌する板状のアジテータ３１
と、発泡ポリウレタン等の弾性ローラからなりアジテー
タ３１により攪拌されたシアン現像剤３０Ｃを供給する
トナー供給ローラ３４と、回転支持体２５の外周側に配
置され弾性を有する現像ローラ３３とを有している。３
５はトナー薄層形成ブレードであり、トナー薄層形成ブ
レード３５はトナー供給ローラ３４により現像ローラ３
３に供給されたシアン現像剤３０Ｃを現像ローラ３３の
外周表面にトナー薄層を形成するようになされる。現像
ローラ３３は、回転支持体２５が回転し現像器２７を感
光体ドラム１１に接触する現像位置Ｑに回動したとき、
感光体ドラム１１に接触する接触位置Ｍに位置し、感光
体ドラム１１上の潜像を現像する。第１図は現像器２７
Ｃが現像位置Ｑに位置し、現像器２７Ｃの現像ローラ３
３が接触位置Ｍに位置している状態を示している。The developing device 27C includes a plate-shaped agitator 31 that slowly agitates a cyan developer 30C (representatively referred to as 30) as a developer on the center side of the rotating support 25 while rotating.
, a toner supply roller 34 which is made of an elastic roller such as foamed polyurethane and which supplies the cyan developer 30C stirred by an agitator 31, and a developing roller 33 which is arranged on the outer circumferential side of the rotating support body 25 and has elasticity. There is. 3
5 is a toner thin layer forming blade, and the toner thin layer forming blade 35 is connected to the developing roller 3 by the toner supply roller 34.
The cyan developer 30C supplied to the developing roller 33 is used to form a thin toner layer on the outer peripheral surface of the developing roller 33. The developing roller 33 rotates when the rotary support 25 rotates and the developing device 27 is rotated to the developing position Q where it contacts the photosensitive drum 11.
It is located at a contact position M in contact with the photoreceptor drum 11, and develops the latent image on the photoreceptor drum 11. Figure 1 shows the developing device 27.
C is located at the developing position Q, and the developing roller 3 of the developing device 27C
3 shows the state where it is located at the contact position M.
現像ローラ３３は現像ローラ３３０両端が回転支持体２
５に回転自在に軸支され、回転支持体２５に対して相対
位置が一定に固定されている。現像ローラ３３はアクリ
ロニトリル・ブタジェン共重合物（ＮＢＲ）、ポリウレ
タンゴム等のゴム部材からなる弾性ローラてあり、この
ゴム部材はＪＩＳ規格のＡ硬度で５０〜６０度の硬さを
有している。Both ends of the developing roller 33 are connected to the rotating support body 2.
5, and its relative position relative to the rotation support body 25 is fixed at a constant position. The developing roller 33 is an elastic roller made of a rubber member such as acrylonitrile-butadiene copolymer (NBR) or polyurethane rubber, and this rubber member has a hardness of 50 to 60 degrees in A hardness according to the JIS standard.
また、第２図に示すように、現像ローラ３３の周方向の
線速度は感光体ドラム１１の周方向の線速度に対して１
．５〜２．０倍であり、現像ローラ３３は感光体ドラム
ｌ】に接触して反時計方向Ｃに回転するようになされて
いる。この現像ローラ３３と感光体ドラム１１との接触
時に現像ローラ３３の変形量は０．１〜０．３鶴になる
ようになされている。Further, as shown in FIG. 2, the circumferential linear velocity of the developing roller 33 is 1 with respect to the circumferential linear velocity of the photosensitive drum 11.
．． 5 to 2.0 times, and the developing roller 33 is configured to contact the photosensitive drum 1 and rotate in a counterclockwise direction C. When the developing roller 33 comes into contact with the photosensitive drum 11, the amount of deformation of the developing roller 33 is 0.1 to 0.3.
感光体ドラムｌｌ上の潜像を白黒・フルカラー画像で現
像する際、カラー現像装置１５内のシアン現像剤３０ば
トナー供給ローラ３４により現像ローラ３３に供給され
、トナー薄層形成ブレード３５により現像ローラ３３の
外周表面に均一な厚さの薄層に形成される。そして、感
光体ドラム１１の回転に同期してカラー現像装置１５の
回転支持体２５がタイミングを合わせて回転し感光体ド
ラム１１に対向する現像器ｉＱに所定の現像器２７の現
像ローラ３３を接触させ現像する。このような現像工程
が４回行われて感光体トラム１１上にフルカラー画像が
形成され、次いで転写チャージャ１６により転写紙２１
上に一度で転写され、転写紙２１は図示していない定着
ユニットにより定着され、複写機外に排出される。When developing the latent image on the photoreceptor drum 11 into a monochrome or full-color image, the cyan developer 30 in the color developing device 15 is supplied to the developing roller 33 by the toner supply roller 34, and the cyan developer 30 in the color developing device 15 is supplied to the developing roller 33 by the toner thin layer forming blade 35. A thin layer of uniform thickness is formed on the outer circumferential surface of 33. Then, the rotating support 25 of the color developing device 15 rotates in synchronization with the rotation of the photoconductor drum 11, and brings the developing roller 33 of a predetermined developing device 27 into contact with the developing device iQ facing the photoconductor drum 11. Develop. Such a developing process is performed four times to form a full-color image on the photoreceptor tram 11, and then the transfer charger 16 transfers the image to the transfer paper 21.
The image is transferred onto the transfer paper 21 at once, and the transfer paper 21 is fixed by a fixing unit (not shown), and then ejected from the copying machine.
また、前述の現像工程が終了した後、すなわち、非現像
時には、回転支持体２５がパルスモータにより駆動され
て回転移動し、第３図に示すように、すべての現像器２
７の現像ローラ３３はそれぞれ感光体ドラム１１に接触
して現像する接触位置Ｍから離隔した離隔位置Ｎ、−Ｎ
４（代表するときはＮという）に移動し停止するように
なされている。なお、非現像時における回転支持体２５
の回転方向は、時計方向Ｂでもよいし、時計方向Ｂと逆
方向に回転移動してもよい。すなわち、離隔位置Ｎ、〜
Ｎ４にそれぞれ現像器２７Ｙ、２７Ｂ、２７Ｍ、２７Ｙ
の現像ローラ３３が位置し停止している。Further, after the above-mentioned developing process is completed, that is, during non-developing, the rotary support 25 is driven by a pulse motor and rotates, and as shown in FIG.
The developing rollers 33 of No. 7 are located at separate positions N, -N, which are separated from the contact position M where they contact the photoreceptor drum 11 to develop the image.
4 (referred to as N when representing) and stops. Note that the rotating support 25 during non-development
The rotation direction may be clockwise B, or may be rotated in the opposite direction to clockwise direction B. That is, the remote position N, ~
Developing units 27Y, 27B, 27M, 27Y in N4 respectively
The developing roller 33 is positioned and stopped.
なお、前述の実施例においては、接触位置Ｍから回転支
持体２５の回転方向上流側の離隔位置Ｎ。In the above-mentioned embodiment, the remote position N is located upstream from the contact position M in the rotational direction of the rotary support 25.
には現像器２７Ｃの現像ローラ３３が位置している場合
につき説明したが、白黒・フルカラー兼用の複写機にお
いて、白黒コピーの使用が圧倒的に多い場合には、本発
明の請求項３に係るカラー現像装置に記載の第４図に示
すように、離隔位置Ｎ、に現像器２７Ｂの現像ローラ３
３を位置させるのが好ましい。すなわち、非現像時に、
回転支持体２５がパルスモータにより駆動されて回転移
動するとき、現像ローラ３３が位置する離隔位置Ｎにお
いて、接触位置Ｍから回転支持体２５の回転方向上流側
の最短距離の離隔位置Ｎ１は、黒現像剤３０Ｂの薄層を
形成した現像ローラ３３が常に来て停止する位置にする
ことが好ましい。このとき、現像ローラ３３が接触位置
Ｍから離隔位置Ｎ、に回転する方向は時計方向Ｂでもよ
いし、逆に反時計方向であってもよいのは勿論である。Although the case where the developing roller 33 of the developing device 27C is located has been described above, in a case where black and white copying is overwhelmingly used in a monochrome/full color copying machine, according to claim 3 of the present invention, As shown in FIG. 4 in the color developing device, the developing roller 3 of the developing device 27B is located at a remote position N.
It is preferable to position 3. In other words, when not developing,
When the rotary support body 25 is driven by a pulse motor and rotates, at the remote position N where the developing roller 33 is located, the distance position N1 of the shortest distance upstream of the rotational direction of the rotary support body 25 from the contact position M is black. It is preferable that the developing roller 33 on which a thin layer of the developer 30B is formed always come to a position where it stops. At this time, it goes without saying that the direction in which the developing roller 33 rotates from the contact position M to the separation position N may be clockwise B or, conversely, counterclockwise.
次に、作用につき説明する。Next, the effect will be explained.
本発明の請求項１．２では、回転支持体２５が感光体ド
ラム１１の回転とタイミングを合わせて回転し、第１図
に示すように、所定の現像器２７の現像ローラ３３が感
光体ドラム１１に接触して現像し、回転支持体２５０回
転だけで接触位置Ｍで感光体ドラム１１と現像ローラ３
３との均一な接触ができる。このため、従来のように、
回転支持体に対して、各現像器を独立して構成し、現像
器を押圧する押圧手段が不要となり、構造が簡単で小型
にでき、かつ、低コストにできる。In claim 1.2 of the present invention, the rotary support 25 rotates in synchronization with the rotation of the photoreceptor drum 11, and as shown in FIG. The photosensitive drum 11 and the developing roller 3 are brought into contact with each other at the contact position M by only 250 rotations of the rotating support.
Uniform contact with 3 is possible. For this reason, as in the past,
Each developing device is configured independently with respect to the rotating support, and a pressing means for pressing the developing device is unnecessary, and the structure can be made simple and compact, and the cost can be reduced.
また、現像工程が終了し非現像時になると、回転支持体
２５がパルスモータにより駆動され、回転移動し、現像
ローラ３３が接触位置Ｍから離隔位置Ｎに移動して感光
体ドラム１１から離れて停止する。Further, when the developing process is completed and a non-developing period occurs, the rotary support body 25 is driven by a pulse motor and rotates, and the developing roller 33 moves from the contact position M to the separation position N, moves away from the photoreceptor drum 11, and stops. do.
このため、現像ローラ３３は感光体ドラム１１により歪
を受けることはない。したがって、現像ローラ３３に歪
が発生するのを防止でき、画像上の横スジ、汚れ等の発
生を防止することができる。Therefore, the developing roller 33 is not distorted by the photosensitive drum 11. Therefore, it is possible to prevent distortion from occurring in the developing roller 33, and it is possible to prevent horizontal lines, stains, etc. from occurring on the image.
また、本発明の請求項３によれば、現像工程が終了し、
非現像時になると、回転支持体２５がパルスモータによ
り駆動され、回転移動し、接触位置Ｍから回転支持体２
５の回転方向上流側の最短距離の離隔位置Ｎ１に黒現像
剤３０Ｂを有する現像ローラ３３Ｂが常に停止している
ため、白黒・フルカラー兼用の複写機において、白黒複
写をする際、現像ローラ３３Ｂを離隔位置Ｎ、から接触
位置Ｍに回転移動させる回転支持体２５の回転移動距離
が他の現像ローラ３３に比較し最短で、かつ距離が短い
。Further, according to claim 3 of the present invention, the developing step is completed,
During non-development, the rotary support 25 is driven by a pulse motor, rotates, and moves from the contact position M to the rotary support 2.
Since the developing roller 33B having the black developer 30B is always stopped at the shortest distance upstream position N1 in the rotational direction of the image forming apparatus 5, the developing roller 33B is always stopped when making black-and-white copies in a black-and-white/full-color copying machine. The rotational movement distance of the rotary support member 25 that is rotationally moved from the separation position N to the contact position M is the shortest and the distance is shorter than that of the other developing rollers 33.
このため、回転支持体２５の回転移動が比較的低速にで
き、かつ回転の慣性が小さくでき、回転支持体２５０回
転の開始および停止時の衝撃もなく、迅速に正確に白黒
現像器２７Ｂを選択できる。Therefore, the rotating support 25 can be rotated at a relatively low speed and the rotational inertia can be small, and there is no shock when the rotation of the rotating support 250 starts and stops, and the black and white developer 27B can be quickly and accurately selected. can.
（効果〕
以上説明したように、本発明の請求項１によれば、回転
型のカラー現像装置で弾性を有する現像ローラを回転支
持体に対して相対位置を固定して支持させることｂこよ
り、回転支持体の回転だけで現像位置にて画像担持体と
現像ローラの均一な接触ができ、かつ、小型で、低コス
トで、トナー落ちが防止できる。(Effects) As described above, according to claim 1 of the present invention, by supporting the elastic developing roller in a rotary color developing device with its relative position fixed relative to the rotary support, b. Uniform contact between the image carrier and the developing roller can be achieved at the developing position simply by rotating the rotary support, and the toner can be kept compact and at low cost to prevent toner from falling off.
また、請求項２によれば、前記に加え、非現像時には回
転支持体の回転だけで、現像ローラを画像担持体に接触
する接触位置から離隔した離隔位置に移動させることに
より、現像ローラの歪を防止し、画像上の横スジ、汚れ
、画像波は等の発生が防止できる。According to claim 2, in addition to the above, the developing roller can be distorted by moving the developing roller from a contact position where it contacts the image carrier to a remote position by simply rotating the rotary support during non-development. It is possible to prevent the occurrence of horizontal lines, stains, image waves, etc. on the image.
また、請求項３によれば、前記に加え、非現像時には、
前記接触位置から回転支持体の回転方向上流側の最短距
離の前記離隔位置は黒現像剤を有する現像ローラのくる
位置とすることにより、白黒コピーを取るとき、白黒用
現像器の選択が小さい慣性で衝撃なく迅速にでき、かつ
正確にできる。According to claim 3, in addition to the above, when not developing,
The distance from the contact position to the upstream side in the rotational direction of the rotary support member, which is the shortest distance, is the position where the developing roller containing the black developer is located. It can be done quickly and accurately without impact.
第１〜４図は本発明に係るカラー現像装置の一実施例を
示す図であり、第１図は白黒・フルカラー兼用複写機に
適用したカラー現像装置の近傍の概略説明図、第２図は
その要部を示す説明図、第３図は非現像時の現像ローラ
の位置を示す概略説明図、第４図は非現像時の黒現像ロ
ーラの位置を示す概略説明図である。第５図は従来のカ
ラー現像装置を示す概略説明図である。
１１・−・・・・感光体ドラム（画像担持体）、１５・
・・−・−カラー現像装置、
２５−・・−・回転支持体、
２７．２７Ｃ１２７Ｙ、２７Ｍ、２７Ｂ・・・−・現像
器、３３．３３Ｃ１３３Ｂ・・−・・現像ローラ、Ｍ・
・・・・・接触位置、
Ｎ、Ｎ、〜Ｎ４・・・・・・離隔位置、Ｐ・・・・・・
回転中心軸線。1 to 4 are diagrams showing one embodiment of the color developing device according to the present invention, FIG. 1 is a schematic explanatory diagram of the vicinity of the color developing device applied to a black-and-white/full-color copying machine, and FIG. FIG. 3 is a schematic diagram showing the position of the developing roller during non-development, and FIG. 4 is a schematic diagram showing the position of the black developing roller during non-development. FIG. 5 is a schematic explanatory diagram showing a conventional color developing device. 11... Photosensitive drum (image carrier), 15.
...-Color developing device, 25-...Rotating support, 27.27C127Y, 27M, 27B...-Developing device, 33.33C133B...Developing roller, M.
...Contact position, N, N, ~N4...Separate position, P...
Rotation center axis.
Claims (3)
転支持体に複数の現像器をそれぞれ支持させ、所定の現
像器を画像担持体に対向する現像位置に回動させて現像
を行うカラー現像装置において、前記現像器は前記回転
支持体の外周側に外周表面に現像剤の薄膜を形成し画像
担持体に接触して現像を行う現像ローラを有し、該現像
ローラは弾性を有し、前記回転支持体に対して相対位置
を固定して前記現像器に軸支されていることを特徴とす
るカラー現像装置。(1) A plurality of developing devices are each supported by a rotating support disposed parallel to the central axis of rotation of the image carrier, and a predetermined developing device is rotated to a developing position facing the image carrier to perform development. In the color developing device, the developing device has a developing roller that forms a thin film of developer on the outer peripheral surface of the rotating support and develops the image by contacting the image carrier, and the developing roller has elasticity. A color developing device comprising: a color developing device which is pivotally supported by the developing device with a fixed relative position with respect to the rotating support.
して現像する接触位置から離隔した離隔位置に前記回転
担持体により回転移動させられることを特徴とする請求
項１記載のカラー現像装置。(2) The color developing device according to claim 1, wherein the developing roller is rotatably moved by the rotary carrier to a remote position away from a contact position where it contacts the image carrier and develops when not developing.
ら前記回転支持体の回転方向上流側の最短距離に黒現像
剤の薄膜を形成した現像ローラがくる位置であることを
特徴とする請求項２記載のカラー現像装置。(3) The separated position of the developing roller is a position where the developing roller on which a thin film of black developer is formed is located at the shortest distance upstream from the contact position in the rotational direction of the rotating support. 2. The color developing device according to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2333691A JP3023167B2 (en) | 1990-11-29 | 1990-11-29 | Color developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2333691A JP3023167B2 (en) | 1990-11-29 | 1990-11-29 | Color developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04199164A true JPH04199164A (en) | 1992-07-20 |
| JP3023167B2 JP3023167B2 (en) | 2000-03-21 |
Family
ID=18268893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2333691A Expired - Lifetime JP3023167B2 (en) | 1990-11-29 | 1990-11-29 | Color developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3023167B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440373A (en) * | 1992-09-25 | 1995-08-08 | Ricoh Company, Ltd. | Color image forming apparatus |
| JP2007171591A (en) * | 2005-12-22 | 2007-07-05 | Konica Minolta Business Technologies Inc | Image forming apparatus |
-
1990
- 1990-11-29 JP JP2333691A patent/JP3023167B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440373A (en) * | 1992-09-25 | 1995-08-08 | Ricoh Company, Ltd. | Color image forming apparatus |
| JP2007171591A (en) * | 2005-12-22 | 2007-07-05 | Konica Minolta Business Technologies Inc | Image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3023167B2 (en) | 2000-03-21 |
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