JPH071407B2 - Development device - Google Patents
Development deviceInfo
- Publication number
- JPH071407B2 JPH071407B2 JP60107722A JP10772285A JPH071407B2 JP H071407 B2 JPH071407 B2 JP H071407B2 JP 60107722 A JP60107722 A JP 60107722A JP 10772285 A JP10772285 A JP 10772285A JP H071407 B2 JPH071407 B2 JP H071407B2
- Authority
- JP
- Japan
- Prior art keywords
- developing device
- developing
- image carrier
- gear
- drive mechanism
- 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
- Magnetic Brush Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Description
【発明の詳細な説明】 ［発明の技術分野］ 本発明は例えば二色カラー複写機に用いられる現像装置
に関する。Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a developing device used in, for example, a two-color color copying machine.
［発明の技術的背景とその問題点］ この種の現像装置においては、感光体ドラム（像担持
体）に対して接離可能に二種の現像器、すなわち例えば
赤色の現像剤を収容した現像器と、黒色の現像剤を収容
した現像器とが設けられ、これら現像器内にそれぞれ現
像ローラが収納されている。そしてオペレータによる操
作でその一方の現像器が選択され、その選択された現像
器が感光体ドラムに近接して対向し、また現像ローラ駆
動手段が動作し、この駆動手段により各現像器の現像ロ
ーラが駆動され、感光体ドラムに近接した現像器におけ
る現像ローラの動作で感光体ドラム上の静電潜像が現像
されるようになっている。[Technical Background of the Invention and Problems Thereof] In this type of developing device, two types of developing devices, that is, a developing device containing red developer, for example, can be brought into contact with and separated from a photosensitive drum (image bearing member). A developing device and a developing device containing a black developer are provided, and the developing roller is housed in each of these developing devices. Then, one of the developing devices is selected by the operation of the operator, the selected developing device closely faces the photoconductor drum, and the developing roller driving means operates, and the developing roller of each developing device is operated by this driving means. Is driven, and the electrostatic latent image on the photosensitive drum is developed by the operation of the developing roller in the developing device which is close to the photosensitive drum.
ところがこのように従来においては、現像ローラ駆動手
段が動作すると、感光体ドラムに近接した現像器の現像
ローラと、感光体ドラムから離間した現像器の現像ロー
ラとが共に駆動され、このため感光体ドラムから離間し
た現像器においてはその現像ローラの動作で現像器内の
現像剤が外部に飛散し、複写機の機体内が汚染され、ま
た無用に現像ローラが動作して無駄に動力が消費され、
さらにその飛散した現像剤が他方の現像器の現像剤と感
光体ドラムの上で混合して混色を起こしてしまう難点が
ある。However, in the related art, when the developing roller driving means operates in this way, the developing roller of the developing unit close to the photoconductor drum and the developing roller of the developing unit separated from the photoconductor drum are both driven. In the developing device separated from the drum, the developer in the developing device is scattered to the outside by the operation of the developing roller, and the inside of the copying machine is contaminated, and the developing roller operates unnecessarily and power is wasted. ,
Further, there is a problem that the scattered developer mixes with the developer of the other developing device on the photosensitive drum to cause color mixing.
［発明の目的］ 本発明はこのような点に着目してなされたもので、その
目的とするところは、像担持体に近接してその像担持体
上に実際に現像剤を供給する現像ローラのみを簡単な構
成でかつ的確に駆動し、像担持体から離間して現像を待
機する他方の現像器の現像ローラの無用な駆動を防止す
ることができる現像装置を提供することにある。[Object of the Invention] The present invention has been made by paying attention to such a point, and an object of the present invention is to provide a developing roller which is close to an image carrier and which actually supplies a developer onto the image carrier. It is an object of the present invention to provide a developing device which has a simple structure and can be driven accurately and which can prevent unnecessary driving of the developing roller of the other developing device which is separated from the image carrier and stands by for developing.
［発明の概要］ 本発明はこのような目的を達成するために、静電潜像を
担持する像担持体と、この像担持体上の静電潜像に対し
て第１の現像剤を供給するための第１の現像ローラを有
した第１の現像器と、この第１の現像器を前記像担持体
に対して近接する方向と前記像担持体から離間する方向
とにスライド自在に支持した第１の支持手段と、この第
１の支持手段に支持されてスライドする前記第１の現像
器の一部と接触することにより前記像担持体に近接する
方向の移動を規制する第１の規制手段と、前記像担持体
上の静電潜像に対して第２の現像剤を供給するための第
２の現像ローラを有した第２の現像器と、この第２の現
像器を前記像担持体に対して近接する方向と前記像担持
体から離間する方向とにスライド自在に支持した第２の
支持手段と、この第２の支持手段に支持されてスライド
する前記第２の現像器の一部と接触することにより前記
像担持体に近接する方向の移動を規制する第２の規制手
段と、前記第１もしくは第２の現像ローラを駆動するた
めの手段であって、モータに連動する差動ギヤーおよび
この作動ギヤーに常時噛合する連動ギヤーとで構成され
た単一の駆動機構と、前記第１の現像器の前記第１の現
像ローラに取り付けられ、前記第１の現像器が前記第１
の規制手段に接触してその移動が規制される状態のとき
に前記駆動機構の連動ギヤーに噛合し、前記第１の現像
器が前記第１の規制手段に接触しない状態のときに前記
駆動機構の連動ギヤーから離間する第１の係脱ギヤー
と、前記第２の現像器の前記第２の現像ローラに取り付
けられ、前記第２の現像器が前記第２の規制手段に接触
してその移動が規制される状態のときに前記駆動機構の
連動ギヤーに噛合し、前記第２の現像器が前記第２の規
制手段に接触しない状態のときに前記駆動機構の連動ギ
ヤーから離間する第２の係脱ギヤーと、前記第１および
第２の支持手段にスライド自在に支持されている前記第
１および第２の現像器を択一的に付勢して前記像担持体
に対して接離させるものであって、前記第１の現像器を
付勢したときには前記第１の現像器を前記像担持体に近
接する方向にスライドさせて前記第１の係脱ギヤーを前
記駆動機構の連動ギヤーに噛合させ、前記第２の現像器
を付勢したときには前記第２の現像器を前記像担持体に
近接する方向にスライドさせて前記第２の係脱ギヤーを
前記駆動機構の連動ギヤーに噛合させる現像器接離機構
とを具備するようにしたものである。SUMMARY OF THE INVENTION In order to achieve such an object, the present invention supplies an image bearing member carrying an electrostatic latent image and a first developer to the electrostatic latent image on the image bearing member. And a first developing device having a first developing roller for supporting the first developing device, and the first developing device is slidably supported in a direction in which the first developing device is close to the image carrier and a direction in which the first developer is separated from the image carrier. The first supporting unit and the first developing unit that is supported by the first supporting unit and slides on the first developing unit are brought into contact with each other to restrict movement in a direction approaching the image carrier. The regulating means, a second developing device having a second developing roller for supplying a second developer to the electrostatic latent image on the image carrier, and the second developing device A second support slidably supported in a direction close to the image carrier and in a direction away from the image carrier. Holding means, and second restricting means for restricting movement in a direction approaching the image carrier by contacting a part of the second developing device which is supported and slid by the second supporting means, A single drive mechanism for driving the first or second developing roller, comprising a differential gear that interlocks with a motor and an interlocking gear that constantly meshes with the operating gear; A first developing device attached to the first developing roller, and the first developing device is attached to the first developing roller.
When the first developing device is in a state in which the first developing device is not in contact with the first regulating means, the drive mechanism is engaged with the interlocking gear of the driving mechanism when the movement is regulated. Attached to the first engagement / disengagement gear separated from the interlocking gear and the second development roller of the second development device, and the second development device comes into contact with the second restriction means to move the same. Is engaged with the interlocking gear of the drive mechanism when the second developing device is not in contact with the second restricting means. The engagement / disengagement gear and the first and second developing devices slidably supported by the first and second supporting means are selectively biased to be brought into contact with or separated from the image carrier. When the first developing device is energized, The first developing device is slid toward the image carrier to engage the first engaging / disengaging gear with the interlocking gear of the drive mechanism, and when the second developing device is energized, the second developing device is activated. The developing device contact / separation mechanism for sliding the second engagement / disengagement gear to the interlocking gear of the drive mechanism by sliding the development device in the direction close to the image carrier.
［発明の実施例］ 以下、本発明の一実施例について図面を参照して説明す
る。[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.
図中１は二色カラー複写機の本体で、この本体１の上部
に原稿台２が設けられ、この原稿台２の下方側に露光光
学装置３を構成するランプ等の光源3a、ミラーM1〜M6、
レンズ3b等が設けられている。また本体１内のほぼ中央
部に像担持体として感光体ドラム４が回転駆動可能に設
けられているとともに、この感光体ドラム４の周囲にそ
の回転方向に向かって順に帯電装置５、二色カラー現像
用の第１および第２の現像器6,7、さらに転写装置８、
クリーニング装置９、除電装置10等が配設されている。In the figure, reference numeral 1 denotes a main body of a two-color color copying machine. An original table 2 is provided on the main body 1, and a light source 3a such as a lamp and a mirror M 1 which constitute an exposure optical device 3 are provided below the original table 2. ~ M 6 ,
A lens 3b and the like are provided. A photosensitive drum 4 as an image bearing member is rotatably provided in the substantially central portion of the main body 1, and a charging device 5 and a two-color color roller are arranged around the photosensitive drum 4 in the order of rotation. First and second developing devices 6 and 7 for development, and further a transfer device 8,
A cleaning device 9, a static eliminator 10 and the like are provided.
本体１の下部の一方側には、上記感光ドラム４の外周下
側の転写部位にこの感光ドラム４の回転に同期して被転
写部材であるコピー用紙Ｐを供給する給紙装置11が設け
られ、また他方側には搬送ベルト12が設けられ、この搬
送ベルト12の搬送方向先端部に定着装置13が、さらにそ
の先に一対の排紙ローラ14および本体１の外部に突出し
て排紙トレー15がそれぞれ設けられている。なお16は本
体１の内部を冷却する冷却ファンである。On one side of the lower part of the main body 1, there is provided a paper feeding device 11 for supplying a copy sheet P, which is a transfer target member, to a transfer portion below the outer periphery of the photosensitive drum 4 in synchronization with the rotation of the photosensitive drum 4. Further, a conveyor belt 12 is provided on the other side, and a fixing device 13 is provided at the front end portion of the conveyor belt 12 in the conveying direction, and a pair of paper ejection rollers 14 and a paper ejection tray 15 projecting outside the main body 1 further ahead. Are provided respectively. Reference numeral 16 is a cooling fan for cooling the inside of the main body 1.
そして感光ドラム４は、これの回転に伴って、まず帯電
装置５により一様に帯電される。一方、原稿台２の上に
載置された原稿に対して、感光体ドラム４の回転と同期
しながら露光光学装置３の光源3aがミラーM1と一体的に
移動してその原稿の画像を走査（スキャン）する。そし
てこの画像の反射光が、ミラーM2,M3の移動に基づいて
光路長を一定に保ちながらレンズ33bおよびミラーM4〜M
6を介して帯電された状態の感光体ドラム４の表面に導
入され、これにより感光体ドラム４の表面に静電潜像が
形成される。The photosensitive drum 4 is first uniformly charged by the charging device 5 as the photosensitive drum 4 rotates. On the other hand, with respect to the original placed on the original table 2, the light source 3a of the exposure optical device 3 moves integrally with the mirror M 1 in synchronization with the rotation of the photosensitive drum 4, and the image of the original is displayed. Scan. The reflected light of the image is, the lens 33b and the mirror M 4 ~M while maintaining the optical path length constant based on the movement of the mirror M 2, M 3
It is introduced via 6 onto the surface of the photoconductor drum 4 in a charged state, whereby an electrostatic latent image is formed on the surface of the photoconductor drum 4.
こののち現像器6,7のいずれか一方により現像剤が搬送
供給されて所定の現像が行なわれ、感光体ドラム４上の
静電潜像が可視像化される。After that, the developer is conveyed and supplied by either one of the developing units 6 and 7 to perform a predetermined development, and the electrostatic latent image on the photosensitive drum 4 is visualized.
この状態でさらに感光体ドラム４の回転が進み、これと
同期して給紙装置41から送り込まれるコピー用紙Ｐに上
記転写装置８の動作で感光体ドラム４上の画像（トナー
像）が転写される。このようにして画像が転写されたコ
ピー用紙Ｐは感光体ドラム４の表面から分離されて搬送
ベルト12により定着装置13に送られ、ここで画像が定着
され、こののち排紙ローラ14により排紙トレー15に送り
出される。In this state, the rotation of the photosensitive drum 4 further progresses, and in synchronization with this, the image (toner image) on the photosensitive drum 4 is transferred to the copy paper P fed from the paper feeding device 41 by the operation of the transfer device 8. It The copy paper P on which the image has been transferred in this manner is separated from the surface of the photosensitive drum 4 and sent to the fixing device 13 by the conveyor belt 12, where the image is fixed, and then the paper is discharged by the paper discharge roller 14. It is sent to tray 15.
一方、コピー用紙Ｐへの画像転写後の感光体ドラム４は
クリーニング装置９により残留現像剤の除去清掃が行な
われ、さらに除電装置10により除電されて一定レベル以
下に電位が下げられて、次の複写動作に備える。On the other hand, after the image is transferred onto the copy sheet P, the cleaning device 9 removes and cleans the residual developer, and the charge removing device 10 removes the charge to reduce the potential to a certain level or lower. Prepare for the copy operation.
このような二色カラー複写機における給紙装置11は次の
ように構成されている。すなわち、本体１内の一端側下
部に上下二段にカセット収納部20a,20bが設けられ、こ
の各カセット収納部20a,20bに収納用紙サイズをB5とA4
等に異にした給紙カセット21a,21bが挿脱可能にセット
され、かつこれら給紙カセット21a,21bの各上方側に回
転駆動可能に自動給紙ローラ22a,22bが設けられて自動
給紙部が構成されている。The sheet feeding device 11 in such a two-color color copying machine is configured as follows. That is, two upper and lower cassette storage portions 20a, 20b are provided in the lower part of the one end side in the main body 1, and storage paper sizes B5 and A4 are stored in the respective cassette storage portions 20a, 20b.
Different paper cassettes 21a and 21b are set so that they can be inserted and removed, and automatic paper feed rollers 22a and 22b are provided rotatably on the upper sides of these paper cassettes 21a and 21b to automatically feed paper. Parts are made up.
そして自動給紙部の上方側に手差し給紙口23が設けら
れ、その内方部に手差し給紙ローラ24が回転駆動可能に
設けられている。なお上記自動給紙部の上段側の給紙カ
セット21aの自動給紙ローラ22aは給紙動作中以外は手差
し給紙ローラ24よりも上方に退避させてある。また上段
側の給紙カセット21aのセット位置内奥部に手差し給紙
用も兼ねた一対の搬送ローラ25が回転駆動可能に設けら
れ、下段側の給紙カセット21bのセット位置内奥部にも
一対の搬送ローラ26が回転駆動可能に設けられている。
これら各一対ずつの搬送ローラ25,26のさらに内方に、
搬送路27を構成する板状の搬送ガイド27a,27b,27cが設
けられている。この搬送路27の内方端部には一対のレジ
ストローラ28が回転駆動可能に設けられているととも
に、このレジストローラ28と感光体ドラム４の外周の下
側転写部位との間に搬送ガイド29が設けられている。A manual paper feed port 23 is provided above the automatic paper feed unit, and a manual paper feed roller 24 is rotatably driven inside the manual paper feed port 23. The automatic paper feed roller 22a of the paper feed cassette 21a on the upper side of the automatic paper feed unit is retracted above the manual paper feed roller 24 except during the paper feeding operation. In addition, a pair of conveyance rollers 25 also serving as a manual paper feed are rotatably provided in the inner part of the setting position of the upper sheet feeding cassette 21a, and also in the inner part of the setting position of the lower sheet feeding cassette 21b. A pair of transport rollers 26 are provided so as to be rotatable.
Further inside the conveying rollers 25, 26 of each pair,
Plate-shaped transfer guides 27a, 27b, and 27c forming the transfer path 27 are provided. A pair of registration rollers 28 is rotatably provided at the inner end of the conveyance path 27, and a conveyance guide 29 is provided between the registration rollers 28 and the lower transfer portion of the outer periphery of the photosensitive drum 4. Is provided.
そして、このような給紙装置11はオペレータによる用紙
サイズの選択や自動あるいは手差し給紙の選択等によ
り、それ対向した給紙ローラ（22a,22b,24のうちの一
つ）が給紙動作を行なう。例えば、B5サイズを選択した
場合、上段側の自動給紙ローラ22aが下降して回転し、
上段側の給紙カセット21a内のB5サイズのコピー用紙Ｐ
を最上層から一枚ずつ繰り出して搬送ローラ25間に送
る。またA4サイズを選択した場合、下段側の自動給紙ロ
ーラ22bが回転し、下段側の給紙カセット21b内のA4サイ
ズのコピー用紙Ｐを最上層から一枚ずつ繰り出して搬送
ローラ26間に送る。一方、手差しの場合は手差し給紙ロ
ーラ24が回転し、手差し給紙口23から挿入されたコピー
用紙Ｐを搬送ローラ25間に送る。In such a sheet feeding device 11, the sheet feeding roller (one of 22a, 22b, and 24) facing the sheet feeding device 11 performs the sheet feeding operation according to the selection of the sheet size by the operator or the selection of automatic or manual sheet feeding. To do. For example, when B5 size is selected, the upper automatic feed roller 22a is lowered and rotated,
B5 size copy paper P in the upper paper feed cassette 21a
Are fed one by one from the uppermost layer and sent between the transport rollers 25. Further, when the A4 size is selected, the lower automatic sheet feeding roller 22b rotates, and the A4 size copy sheets P in the lower sheet feeding cassette 21b are fed one by one from the uppermost layer and sent between the transport rollers 26. . On the other hand, in the case of manual feeding, the manual paper feeding roller 24 is rotated to feed the copy paper P inserted from the manual paper feeding port 23 between the transport rollers 25.
このように供給したコピー用紙Ｐを搬送ローラ25または
26の回転により搬送路27に搬送し、その搬送ガイド27a
と27b、または27bと27cで案内してレジストローラ28に
到達させ、そのレジストローラ28により一時整位して感
光体ドラム４の回転と同期すべくタイミングを取り、搬
送ガイド29で案内して感光体ドラム４の外周下側の転写
部に送り込む。The copy paper P supplied in this way is fed to the transport roller 25 or
It is conveyed to the conveyance path 27 by the rotation of 26, and its conveyance guide 27a
And 27b or 27b and 27c to reach the registration roller 28, the registration roller 28 temporarily aligns the timing to synchronize with the rotation of the photosensitive drum 4, and the conveyance guide 29 guides the photosensitive material. It is fed to the transfer section on the lower side of the outer periphery of the body drum 4.
第１および第２の現像器6,7は、それぞれケーシング40
内に現像ローラ41を設けてなり、一方の上段側のケーシ
ング40には例えば赤色の現像剤Daが、また他方の下段側
のケーシング40には例えば黒色の現像剤Dbがそれぞれ収
容されている。なお、これら現像剤Da,Dbはトナーとキ
ャリアとからなる二成分現像剤である。各現像ローラ41
は、マグネットローラ42と、このマグネットローラ42の
外周に嵌合され時計方向に回転する回転スリーブ43とか
らなり、マグネットローラ42は周面に均等に複数の磁極
部を有し、これら磁極部の作用で回転スリーブ43の外周
面に現像剤Da（Db）による磁気ブラシが形成されるよう
になっている。そして、この現像ローラ41に隣設して、
マグネットローラ42の一つの磁極部と対向することによ
り磁気ブラシの形成を阻止するレベラー48が設けられて
いる。なお、45は現像剤攪拌体、46は現像ローラ41上の
現像剤を掻き落すスクレイパー、47はトナーを補給する
補給ローラである。The first and second developing units 6 and 7 are respectively provided with a casing 40.
A developing roller 41 is provided therein, for example, a red developer Da is stored in one upper casing 40 and a black developer Db is stored in the other lower casing 40, respectively. The developers Da and Db are two-component developers composed of toner and carrier. Each developing roller 41
Is composed of a magnet roller 42 and a rotating sleeve 43 that is fitted to the outer circumference of the magnet roller 42 and rotates clockwise. The magnet roller 42 has a plurality of magnetic pole portions evenly on its peripheral surface. By the action, a magnetic brush made of the developer Da (Db) is formed on the outer peripheral surface of the rotating sleeve 43. Then, adjacent to the developing roller 41,
A leveler 48 is provided which opposes one magnetic pole portion of the magnet roller 42 to prevent formation of a magnetic brush. Reference numeral 45 is a developer agitator, 46 is a scraper for scraping off the developer on the developing roller 41, and 47 is a replenishing roller for replenishing the toner.
本体１内には、第２図および第３図に示すように、モー
タ（図示せず）に連動する作動ギヤー50が設けられ、こ
の作動ギヤー50に第１および第２の現像器6,7に対応し
て設けられた一対の連動ギヤー51が噛合し、これら作動
ギヤー50と上記一対の連動ギヤー51とで単一の駆動機構
が構成されている。そして第１および第２の現像器6,7
の各マグネットローラ41に、上記連動ギヤー51に係脱可
能な係脱ギヤー52が設けられている。As shown in FIGS. 2 and 3, an operating gear 50 interlocked with a motor (not shown) is provided in the main body 1, and the operating gear 50 includes first and second developing units 6, 7. A pair of interlocking gears 51 provided corresponding to each other mesh with each other, and the operating gear 50 and the pair of interlocking gears 51 form a single drive mechanism. And the first and second developing units 6,7
Each magnet roller 41 is provided with an engagement / disengagement gear 52 which can be engaged / disengaged with the interlocking gear 51.
第１および第２の現像器6,7は上下に配置するととも
に、第４図に示すように、それぞれ感光体ドラム４に対
して接離する方向に支持手段としてのガイドレール60を
介してスライド自在に支持されている。そしてこれら現
像器6,7には第２図および第３図に示すように、規制手
段としてストッパーピン61が取付けられている。The first and second developing units 6 and 7 are arranged vertically, and as shown in FIG. 4, they slide in the directions toward and away from the photoconductor drum 4 via guide rails 60 as supporting means. It is supported freely. Then, as shown in FIGS. 2 and 3, stopper pins 61 are attached to the developing devices 6 and 7 as restricting means.
本体１内にはフレーム62が設けられ、このフレーム61に
上記各ストッパーピン61に対向して位置決め用のＶ溝63
が切欠形成され、また各現像器6,7の背方部には現像器
接離手段としてのモータ（図示せず）に連動するアーム
64が設けられ、このアーム64の一端部と第１の現像器
６、および他端部と第２の現像器７とがそれぞれスプリ
ング65で連結されている。A frame 62 is provided in the main body 1, and a V groove 63 for positioning is provided on the frame 61 so as to face the stopper pins 61.
Is provided with a notch, and an arm interlocking with a motor (not shown) as a developing device contacting / separating means is provided at the back of each developing device 6, 7.
64 is provided, and one end of the arm 64 is connected to the first developing device 6, and the other end is connected to the second developing device 7 by a spring 65.
しかして、現像動作の待機時においては、各現像器6,7
の現像ローラ41と感光体ドラム４との間の隙間がほぼ同
等の幅に保たれ、またマグネットローラ42の一つの磁極
部がレベラー48に対向し、他の二つの磁極部の相互間中
間部が感光体ドラム４に対向するように配置していて、
この状態からオペレータの操作により例えば第１の現像
器６が選択されると、第２図に示すようにアーム64が反
時計方向に回動し、この回動に伴いスプリング65の付勢
力を介して第１の現像器６が感光体ドラム４に近接する
方向にスライドする。そしてこのスライドに応じてスト
ッパピン61がＶ溝63に係合し、この係合で第１の現像器
６の移動が規制され、この第１の現像器６の係脱ギヤー
52が単一の駆動機構における一方の連動ギヤー51に係合
して噛合する。そして作動ギヤー50の駆動に基づいてマ
グネットローラ42が回転し、レベラー48に対向していた
磁極部がそのレベラー48から遠ざかるとともに、他の一
つの磁極部が感光体ドラム４に対向するように配置し、
これにより回転スリーブ43の外周に磁気ブラシが形成さ
れ、この状態において回転スリーブ43が回転し、その外
周の磁気ブラシのトナーにより、感光体ドラム４上の静
電潜像が現像され可視像化される。この際、第２の現像
器７においては、レベラー48により磁気ブラシの形成が
阻止される状態に保たれているから、この第２の現像器
７の現像剤Dbが不用意に感光体ドラム４に付着するよう
なことがなく、したがって第１の現像器６で的確な現像
を行なうことができる。そして、現像の終了後に、作動
ギヤー50の動作によりマグネットローラ42が再び当初の
状態に戻される。Then, when the developing operation is on standby, each developing device 6, 7
The gap between the developing roller 41 and the photosensitive drum 4 is maintained at a substantially equal width, and one magnetic pole portion of the magnet roller 42 faces the leveler 48, and an intermediate portion between the other two magnetic pole portions. Is arranged so as to face the photosensitive drum 4,
If the first developing device 6 is selected by the operator's operation from this state, the arm 64 rotates counterclockwise as shown in FIG. 2, and the urging force of the spring 65 is generated by this rotation. Then, the first developing device 6 slides in the direction of approaching the photoconductor drum 4. In response to this slide, the stopper pin 61 engages with the V groove 63, the movement of the first developing device 6 is restricted by this engagement, and the engagement / disengagement gear of the first developing device 6 is restricted.
52 engages with and meshes with one interlocking gear 51 in a single drive mechanism. The magnet roller 42 is rotated based on the driving of the operating gear 50, the magnetic pole portion facing the leveler 48 is moved away from the leveler 48, and the other magnetic pole portion is arranged so as to face the photosensitive drum 4. Then
As a result, a magnetic brush is formed on the outer circumference of the rotary sleeve 43, and the rotary sleeve 43 rotates in this state, and the electrostatic latent image on the photosensitive drum 4 is developed by the toner of the magnetic brush on the outer circumference thereof to form a visible image. To be done. At this time, in the second developing device 7, the leveler 48 keeps the magnetic brush from being formed, so that the developer Db of the second developing device 7 is carelessly charged. Therefore, the first developing device 6 can perform accurate development. After the development is completed, the operation of the operating gear 50 causes the magnet roller 42 to return to the initial state again.
一方、オペレータにより第２の現像器７が選択された場
合には、第３図に示すように、アーム64が時計方向に回
動し、この回動に伴いスプリング65の付勢力を介して第
２の現像器７が感光体ドラム４に近接する方向にスライ
ドする。そしてこのスライドに応じてストッパピン61が
Ｖ溝63に係合し、この係合で第２の現像器７の移動が規
制され、この第２の現像器７の係脱ギヤー52が他方の連
動ギヤー51に係合して噛合し、作動ギヤー50の動作で同
様にマグネットローラ42が回転制御され、静電潜像に対
する現像が行なわれる。On the other hand, when the operator selects the second developing device 7, as shown in FIG. 3, the arm 64 rotates clockwise, and with this rotation, the arm 64 is biased by the biasing force of the spring 65. The second developing device 7 slides toward the photoconductor drum 4. In response to this slide, the stopper pin 61 engages with the V groove 63, the movement of the second developing device 7 is restricted by this engagement, and the engagement / disengagement gear 52 of the second developing device 7 interlocks with the other. The magnet 51 is engaged with and meshes with the gear 51, the rotation of the magnet roller 42 is similarly controlled by the operation of the operating gear 50, and the electrostatic latent image is developed.
［発明の効果］ 以上説明したように本発明は、第１の現像器と第２の現
像器とを像担持体に対して接離する方向にスライド自在
に支持し、これら第１および第２の現像器を現像器接離
機構により択一的に付勢し、その一方の例えば第１の現
像器を付勢したときには、その第１の現像器を像担持体
に近接する方向にスライドさせてこの第１の現像器に設
けられている第１の係脱ギヤーを単一の駆動機構におけ
る連動ギヤーに噛合させ、この噛合により駆動機構の回
転を第１の現像器に設けられている第１の現像ローラに
伝達して回転させ、他方の第２の現像器を付勢したとき
には、その第２の現像器を像担持体に近接する方向にス
ライドさせてこの第２の現像器に設けられている第２の
係脱ギヤーを単一の駆動機構における連動ギヤーに噛合
させ、この噛合により駆動機構の回転を第２の現像器に
設けられている第２の現像ローラに伝達して回転させる
ようにしたものである。As described above, according to the present invention, the first developing device and the second developing device are slidably supported in a direction in which they come in contact with and separate from the image carrier, and the first and second developing devices are slidably supported. Of the developing device is selectively urged by the developing device contacting / separating mechanism, and when one of them, for example, the first developing device is urged, the first developing device is slid in the direction of approaching the image carrier. The first engagement / disengagement gear provided in the lever first developing device is engaged with the interlocking gear in the single drive mechanism, and the rotation of the drive mechanism is rotated by this engagement. When the second developing device is transmitted to the first developing roller for rotation and the second developing device is urged, the second developing device is slid in the direction of approaching the image carrier and provided on the second developing device. The second engaged and disengaged gear that is engaged with the interlocking gear in the single drive mechanism. By this engagement, the rotation of the drive mechanism is transmitted to the second developing roller provided in the second developing device to rotate.
つまり、単一の駆動機構を用いて第１の現像器の現像ロ
ーラと第２の現像器の現像ローラとを駆動するものであ
り、このため構造が簡単で安価となる。そして第１およ
び第２の現像器の係脱ギヤーを択一的にその単一の駆動
機構の連動ギヤーに噛合させて現像ローラを回転させる
ものであり、したがって一方の現像器の現像ローラが回
転するときには、他方の現像器の現像ローラの回転が必
ず停止し、このためその他方の現像ローラの回転による
現像剤の飛散がなく、機体内の汚染や像担持体上での現
像剤の混色を確実に防止でき、さらに動力の無駄な消費
を避けることができるという効果を奏する。That is, the single drive mechanism is used to drive the developing roller of the first developing device and the developing roller of the second developing device, and therefore the structure is simple and inexpensive. The engaging and disengaging gears of the first and second developing devices are selectively meshed with the interlocking gear of the single drive mechanism to rotate the developing roller, so that the developing roller of one developing device rotates. When doing so, the rotation of the developing roller of the other developing device must be stopped, so that the developer does not scatter due to the rotation of the other developing roller, and the contamination inside the machine and the color mixture of the developer on the image carrier are prevented. There is an effect that it can be surely prevented, and that wasteful consumption of power can be avoided.
図は本発明の一実施例を示し、第１図は二色カラー複写
機の概略的構成図、第２図は第１の現像器の駆動時の状
態を示す断面図、第３図は第２の現像器の駆動時の状態
を示す断面図、第４図は現像器の支持構造を示す正面図
である。 ４……感光体ドラム、6,7……現像器、41……現像ロー
ラ、50……作動ギヤー、51……連動ギヤー、52……係脱
ギヤー、60……ガイドレール、61……ストッパピン、63
……Ｖ溝。FIG. 1 shows an embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a two-color color copying machine, FIG. 2 is a sectional view showing a state in which a first developing device is driven, and FIG. FIG. 4 is a cross-sectional view showing the driving state of the developing device 2 and FIG. 4 is a front view showing the supporting structure of the developing device. 4 ... Photosensitive drum, 6, 7 ... Developing device, 41 ... Developing roller, 50 ... Operating gear, 51 ... Interlocking gear, 52 ... Engaging gear, 60 ... Guide rail, 61 ... Stopper Pin, 63
...... V groove.
Claims (1)
するための第１の現像ローラを有した第１の現像器と、 この第１の現像器を前記像担持体に対して近接する方向
と前記像担持体から離間する方向とにスライド自在に支
持した第１の支持手段と、 この第１の支持手段に支持されてスライドする前記第１
の現像器の一部と接触することにより前記像担持体に近
接する方向の移動を規制する第１の規制手段と、 前記像担持体上の静電潜像に対して第２の現像剤を供給
するための第２の現像ローラを有した第２の現像器と、 この第２の現像器を前記像担持体に対して近接する方向
と前記像担持体から離間する方向とにスライド自在に支
持した第２の支持手段と、 この第２の支持手段に支持されてスライドする前記第２
の現像器の一部と接触することにより前記像担持体に近
接する方向の移動を規制する第２の規制手段と、 前記第１もしくは第２の現像ローラを駆動するための手
段であって、モータに連動する差動ギヤーおよびこの作
動ギヤーに常時噛合する連動ギヤーとで構成された単一
の駆動機構と、 前記第１の現像器の前記第１の現像ローラに取り付けら
れ、前記第１の現像器が前記第１の規制手段に接触して
その移動が規制される状態のときに前記駆動機構の連動
ギヤーに噛合し、前記第１の現像器が前記第１の規制手
段に接触しない状態のときに前記駆動機構の連動ギヤー
から離間する第１の係脱ギヤーと、 前記第２の現像器の前記第２の現像ローラに取り付けら
れ、前記第２の現像器が前記第２の規制手段に接触して
その移動が規制される状態のときに前記駆動機構の連動
ギヤーに噛合し、前記第２の現像器が前記第２の規制手
段に接触しない状態のときに前記駆動機構の連動ギヤー
から離間する第２の係脱ギヤーと、 前記第１および第２の支持手段にスライド自在に支持さ
れている前記第１および第２の現像器を択一的に付勢し
て前記像担持体に対して接離させるものであって、前記
第１の現像器を付勢したときには前記第１の現像器を前
記像担持体に近接する方向にスライドさせて前記第１の
係脱ギヤーを前記駆動機構の連動ギヤーに噛合させ、前
記第２の現像器を付勢したときには前記第２の現像器を
前記像担持体に近接する方向にスライドさせて前記第２
の係脱ギヤーを前記駆動機構の連動ギヤーに噛合させる
現像器接離機構と、 を具備することを特徴とする現像装置。1. A first image carrier having an electrostatic latent image and a first developing roller for supplying a first developer to the electrostatic latent image on the image carrier. Developing device, first supporting means slidably supporting the first developing device in a direction approaching the image carrier and a direction separating from the image carrier, and the first support means. The first slides supported by means
First restricting means for restricting movement in a direction approaching the image carrier by contacting a part of the developing device, and a second developer for the electrostatic latent image on the image carrier. A second developing device having a second developing roller for supplying, and a second developing device slidable in a direction approaching the image carrier and a direction separating from the image carrier. Second supporting means supported, and the second supporting means supported by the second supporting means and sliding.
Second restricting means for restricting movement in a direction approaching the image carrier by contacting a part of the developing device, and means for driving the first or second developing roller, A single drive mechanism composed of a differential gear that interlocks with the motor and an interlocking gear that constantly meshes with the operating gear; and a single drive mechanism attached to the first developing roller of the first developing device, A state in which the developing device is in contact with the first restricting means and its movement is restricted, meshes with the interlocking gear of the drive mechanism, and the first developing device is not in contact with the first restricting means. Is attached to the first engagement / disengagement gear separated from the interlocking gear of the drive mechanism and the second developing roller of the second developing device, and the second developing device is the second restricting means. The state where the movement is regulated by touching the A second engagement / disengagement gear that is engaged with the interlocking gear of the drive mechanism and is separated from the interlocking gear of the drive mechanism when the second developing device is not in contact with the second regulating unit; The first and second developing devices slidably supported by the first and second supporting means are selectively urged to come into contact with and separate from the image carrier. When the first developing device is energized, the first developing device is slid toward the image carrier to engage the first engagement / disengagement gear with the interlocking gear of the drive mechanism, and When the second developing device is energized, the second developing device is slid in a direction in which the second developing device approaches the image carrier.
A developing device contacting / separating mechanism that meshes the engagement / disengagement gear of 1. with the interlocking gear of the drive mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60107722A JPH071407B2 (en) | 1985-05-20 | 1985-05-20 | Development device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60107722A JPH071407B2 (en) | 1985-05-20 | 1985-05-20 | Development device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61264367A JPS61264367A (en) | 1986-11-22 |
| JPH071407B2 true JPH071407B2 (en) | 1995-01-11 |
Family
ID=14466288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60107722A Expired - Lifetime JPH071407B2 (en) | 1985-05-20 | 1985-05-20 | Development device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH071407B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0743550B2 (en) * | 1985-07-09 | 1995-05-15 | 三田工業株式会社 | Developing device for electrophotography |
| JPH0734133B2 (en) * | 1985-07-27 | 1995-04-12 | 三田工業株式会社 | Developing device for electrophotography |
| JP2583932B2 (en) * | 1987-12-23 | 1997-02-19 | 松下電器産業株式会社 | Image forming device |
| JPS6459260A (en) * | 1987-08-28 | 1989-03-06 | Konishiroku Photo Ind | Developing device |
| JPH0266582A (en) * | 1988-08-31 | 1990-03-06 | Mita Ind Co Ltd | Multiple color developing device for image forming device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60254063A (en) * | 1984-05-30 | 1985-12-14 | Canon Inc | Color image forming device |
-
1985
- 1985-05-20 JP JP60107722A patent/JPH071407B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61264367A (en) | 1986-11-22 |
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