JP3243064B2 - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JP3243064B2 JP3243064B2 JP15764693A JP15764693A JP3243064B2 JP 3243064 B2 JP3243064 B2 JP 3243064B2 JP 15764693 A JP15764693 A JP 15764693A JP 15764693 A JP15764693 A JP 15764693A JP 3243064 B2 JP3243064 B2 JP 3243064B2
- Authority
- JP
- Japan
- Prior art keywords
- cam
- developing device
- contact
- image forming
- developing
- 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
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機、レーザビーム
プリンタ、ファクシミリ等の画像形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a laser beam printer, and a facsimile.
【０００２】[0002]
【従来の技術】従来、一つの感光体に対し、その周囲に
複数の現像装置を配置し、２色以上の画像を形成する画
像形成装置が知られており、例えば、２色カラー複写機
では、一つの感光体ドラムの周囲に、黒の現像剤を収容
した現像装置と、赤や青等の黒以外の色の現像剤を収容
した現像装置とを配置して現像を行なうようになってい
る。このような少なくとも２つの現像装置を備えた画像
形成装置では、現像は一つの色毎に行なわれるため、一
つの現像装置が感光体に対して近接すると、他の現像装
置は感光体より離間するという移動動作が行なわれる
が、その現像装置の移動動作を行なう接離機構としてカ
ムとレバー（カムフォロワ）及びリンクを組み合わせた
機構が知られている（例えば、特開昭６２−１５５６３
号公報、特開昭６２−７５６７５号公報等）。2. Description of the Related Art Conventionally, there has been known an image forming apparatus in which a plurality of developing devices are arranged around one photoreceptor to form an image of two or more colors. Around a photosensitive drum, a developing device containing a black developer and a developing device containing a developer of a color other than black, such as red and blue, are arranged to perform development. I have. In such an image forming apparatus having at least two developing devices, since the development is performed for each color, when one developing device is close to the photoconductor, the other developing device is separated from the photoconductor. A mechanism combining a cam, a lever (cam follower) and a link is known as a contact / separation mechanism for performing the moving operation of the developing device (for example, Japanese Patent Application Laid-Open No. Sho 62-15563).
JP, JP-A-62-75675, etc.).
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来技術のよ
うに、感光体ドラムの周囲に２つ以上の現像装置を配置
してそれぞれの現像装置にカムとレバー（カムフォロ
ワ）及びリンクを組み合わせた接離機構を設けた場合、
感光体ドラムの周囲に、その接離機構のための広いスペ
ースを必要とし、装置の小型化ができないという問題が
ある。また、カムによりレバー（カムフォロワ）、リン
クを介して現像装置を接離させる機構で、レバーの一端
側がカムに当接して駆動される構成では、現像装置が現
像位置（感光体への接触位置）から非現像位置（感光体
への非接触位置）に移動する際に、レバー側からの荷重
によりカムが空転することがあり、このため現像装置が
非現像位置へと急激に移動され、衝撃音の発生や衝撃に
よる現像剤の吹き出しが発生するという問題もある。However, as in the prior art, two or more developing devices are arranged around the photosensitive drum, and each developing device is connected by a combination of a cam, a lever (cam follower) and a link. When a release mechanism is provided,
There is a problem that a large space is required around the photosensitive drum for the contact / separation mechanism, and the apparatus cannot be miniaturized. Further, in a mechanism in which the developing device is brought into contact with and separated from the developing device via a lever (cam follower) and a link by a cam, the developing device is in a developing position (a contact position with the photosensitive member) when one end of the lever is driven by contacting the cam. When moving from the position to the non-development position (the position where the photoreceptor is not contacted), the cam may run idle due to the load from the lever side. Also, there is a problem that the developer is blown out due to generation of a shock or impact.
【０００４】本発明は上記事情に鑑みなされたものであ
って、比較的簡単な構成で且つスペースも取らない接離
機構を備えた画像形成装置を提供することを目的とし、
さらには、接離機構にカム機構を用いた際に、カムの空
転による衝撃音の発生や現像剤の吹き出し等の問題をも
解消することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an image forming apparatus having a relatively simple configuration and a space-saving contact / separation mechanism.
It is still another object of the present invention to solve problems such as generation of an impact sound due to idling of a cam and blowing of a developer when a cam mechanism is used as a contact / separation mechanism.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明は、感光体ドラムに形成された潜像
を顕画像化するための現像装置を有し、該現像装置を感
光体ドラムに対し近接する現像位置と離間する非現像位
置に移動可能に構成し、その接離機構にカム機構を用い
た画像形成装置において、前記接離機構のカム機構に一
対の連結したカムフォロワを設け、その一対のカムフォ
ロワは常にカムに当接していることを特徴としている。
また、上記画像形成装置において、一対の連結したカム
フォロワの当接位置の関係は、カムの回転中心に対し、
約１８０°の位置関係にあることを特徴としている（請
求項２）。In order to achieve the above object, the invention of claim 1 has a developing device for visualizing a latent image formed on a photosensitive drum, and the developing device is provided with a photosensitive device. An image forming apparatus configured to be movable to a non-development position separated from a development position close to the body drum and using a cam mechanism as a contact and separation mechanism, wherein a pair of cam followers connected to a cam mechanism of the contact and separation mechanism are provided. The pair of cam followers are always in contact with the cam.
Further, in the above image forming apparatus, the relationship between the contact positions of the pair of connected cam followers is determined with respect to the rotation center of the cam.
It is characterized by a positional relationship of about 180 ° (claim 2).
【０００６】また、請求項３の発明は、感光体ドラムに
形成された潜像を顕画像化するための現像装置を有し、
該現像装置を感光体ドラムに対し近接する現像位置と離
間する非現像位置に移動可能に構成し、その接離機構に
カム機構を用いた画像形成装置において、前記接離機構
は、カムと、該カムを回転する駆動機構と、駆動軸に一
端側を固定され他端側で前記カムに当接するカムフォロ
ワと、前記駆動軸に固定され現像装置を押圧する板バネ
部材を有し、前記駆動機構でカムを回転し、カムフォロ
ワと駆動軸を介して前記板バネ部材を駆動し現像装置を
接離させる構成であり、且つ、前記接離機構のカムの端
面に当接し該カムにブレーキ作用を与える弾性部材をカ
ムフォロワに設けたことを特徴としている。According to a third aspect of the present invention, there is provided a developing device for visualizing a latent image formed on a photosensitive drum,
In the image forming apparatus, the developing device is configured to be movable to a non-developing position separated from a developing position close to the photosensitive drum, and the contact / separation mechanism is a cam mechanism.
Are connected to a cam, a drive mechanism for rotating the cam, and a drive shaft.
A cam follower whose end is fixed and which comes into contact with the cam at the other end
And a leaf spring fixed to the drive shaft and pressing the developing device.
A cam follower, and a cam follower
The developing device is driven by driving the leaf spring member through the
A structure in which contact away, and is characterized in that abut the end face of the cam of the moving mechanism provided on the cam follower an elastic member providing a braking action to the cam.
【０００７】[0007]
【作用】請求項１の画像形成装置では、現像装置の接離
機構を構成するに一対の連結したカムフォロワを設け、
その一対のカムフォロワは常にカムに当接しているた
め、一対のカムフォロワでカムを挾み込むようにカムに
当接させれば、カムの空転が防止され、さらに請求項２
のように、一対の連結したカムフォロワの当接位置の関
係を、カムの回転中心に対し約１８０°の位置関係とす
ることで、カムの空転がより一層防止され、カムの回転
が円滑になる。In the image forming apparatus of the first aspect, a pair of connected cam followers is provided to constitute a contact / separation mechanism of the developing device,
Since the pair of cam followers is always in contact with the cam, if the pair of cam followers are in contact with the cam so as to sandwich the cam, idling of the cam is prevented.
As described above, the contact position of the pair of connected cam followers is set to a positional relationship of about 180 ° with respect to the rotation center of the cam, so that idling of the cam is further prevented, and the rotation of the cam becomes smooth. .
【０００８】請求項３の画像形成装置では、現像装置の
接離機構を構成するカム機構のカムの端面に当接し該カ
ムにブレーキ作用を与える弾性部材をカムフォロワに設
けたことにより、その弾性部材によるブレーキ作用で上
記と同様にカムの空転が防止され、カムの回転が円滑に
なる。[0008] In the image forming apparatus according to claim 3, abut against the end face of the cam of the cam mechanism constituting the separation mechanism of the developing device 該Ka
Since the cam follower is provided with an elastic member that applies a braking function to the cam, the idling of the cam is prevented in the same manner as described above by the braking operation of the elastic member, and the rotation of the cam becomes smooth.
【０００９】[0009]
【実施例】以下、本発明を図示の実施例に基づいて説明
する。図１は本発明の一実施例を示す画像形成装置の概
略構成図であって、図中符号１は時計方向に回転駆動さ
れるドラム状の感光体である。この感光体１の下方には
給紙カセット２から排紙受け３に至る用紙搬送路が設け
られ、この用紙搬送路には、給紙ローラ５と、レジスト
ローラ６と、転写器７と、定着器８とが配列されてい
る。また、前記感光体１の周囲には、第１帯電器９、第
１露光系１０、第１現像器１１、第２帯電器１２、第２
露光系１３、第２現像器１４、クリーニングユニット１
５、除電器１６が配設されている。また、画像形成部の
上方には原稿読み取り光学系が設けられており、コンタ
クトガラス上に載置された原稿に光源からの光が照射さ
れ、原稿からの反射光像がミラー、レンズ、色分解フィ
ルター等を介してイメージセンサ１７に結像され、黒の
画像情報１７１と黒以外の画像情報１７２とがそれぞれ
画像情報記憶部１７ａ，１７ｂに記憶される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a drum-shaped photosensitive member that is driven to rotate clockwise. A paper transport path from the paper cassette 2 to the paper discharge tray 3 is provided below the photoreceptor 1, and the paper transport path includes a paper feed roller 5, a registration roller 6, a transfer device 7, and a fixing device. Vessels 8 are arranged. Around the photosensitive member 1, a first charger 9, a first exposure system 10, a first developing device 11, a second charger 12,
Exposure system 13, second developing device 14, cleaning unit 1
5. A static eliminator 16 is provided. A document reading optical system is provided above the image forming unit, and the document placed on the contact glass is irradiated with light from a light source, and the reflected light image from the document is mirror, lens, and color separated. An image is formed on the image sensor 17 via a filter or the like, and black image information 171 and non-black image information 172 are stored in the image information storage units 17a and 17b, respectively.
【００１０】第１現像器１０には特定色（例えば黒）の
トナーが装填され、第２現像器１４には他の色（例えば
赤）のトナーが装填されており、本実施例の画像形成装
置では、２色のトナーによって２色画像を提供する。す
なわち、特定色の画像を形成する場合は、感光体１が第
１帯電器９で一様に帯電され、画像情報記録部１７ａか
らの画像情報信号に基づいて第１露光系１０により画像
露光がなされて静電潜像が形成され、該潜像が第１現像
器１１により現像され顕画像化される。また、黒以外の
画像を形成する場合は、感光体１が第２帯電器１２で一
様に帯電され、画像情報記録部１７ｂからの画像情報信
号に基づいて第２露光系１３により画像露光がなされて
静電潜像が形成され、該潜像が第２現像器１４により現
像され顕画像化される。The first developing device 10 is loaded with toner of a specific color (for example, black), and the second developing device 14 is loaded with toner of another color (for example, red). The apparatus provides a two-color image with two-color toner. That is, when an image of a specific color is formed, the photoconductor 1 is uniformly charged by the first charger 9 and image exposure is performed by the first exposure system 10 based on an image information signal from the image information recording unit 17a. Then, an electrostatic latent image is formed, and the latent image is developed by the first developing device 11 to be visualized. When an image other than black is to be formed, the photoconductor 1 is uniformly charged by the second charger 12 and image exposure is performed by the second exposure system 13 based on an image information signal from the image information recording unit 17b. Then, an electrostatic latent image is formed, and the latent image is developed by the second developing device 14 to be visualized.
【００１１】第２現像器１４は、２色画像または赤単色
画像形成以外には用いられない。このため、現像器の消
耗や汚染を防ぐため、第２現像器１４は感光体１に対し
近接する現像位置と、離間する非現像位置に移動可能に
設けられている。すなわち、黒画像のみを形成する場合
は、第２現像器１４は感光体１に対し離間する非現像位
置に移動されており、現像は上述したようにして第１現
像器１１のみにより現像され、記録用紙に転写される。
また、２色画像を形成する場合は、第２現像器１４は感
光体１に対し近接する現像位置に移動され、第１現像器
１１による現像の後、上述したようにして第２現像器１
４による現像が行なわれ、２色画像が記録用紙に転写さ
れる。The second developing unit 14 is used only for forming a two-color image or a monochromatic red image. For this reason, in order to prevent wear and contamination of the developing device, the second developing device 14 is movably provided to a developing position close to the photoconductor 1 and a non-developing position separated from the photosensitive member 1. That is, when only a black image is to be formed, the second developing device 14 has been moved to the non-developing position separated from the photoreceptor 1, and the development is performed only by the first developing device 11 as described above. Transferred to recording paper.
When a two-color image is to be formed, the second developing device 14 is moved to a developing position close to the photoconductor 1, and after the first developing device 11, the second developing device 1 is moved as described above.
4, and a two-color image is transferred to recording paper.
【００１２】ここで、第２現像器１４の接離機構を図２
〜４を参照して説明する。図２において、２１は現像器
１４を押圧する板バネ部材で、紙面に対して手前側と奥
側の２箇所に設けられている。板バネ部材２１は、後述
するカム機構によって所定角回転される駆動軸２２に固
定され、該駆動軸２２を中心にして角度θだけ時計方向
に回転し、現像器１４を感光体１側に押し現像ローラを
当接させる。当接した現像器１４の現像ローラには駆動
及びバイアスが伝達され、感光体１の静電潜像にトナー
を付着させ現像を行なう。現像終了後、板バネ部材２１
は軸２２を中心にして角度θだけ反時計方向に回転し、
現像器１４は解除用板バネ部材２３により押圧され感光
体１より離間し、非現像位置へ戻る。Here, the mechanism for contacting and separating the second developing device 14 is shown in FIG.
This will be described with reference to FIGS. In FIG. 2, reference numeral 21 denotes a leaf spring member for pressing the developing device 14, which is provided at two positions on the near side and the far side with respect to the paper surface. The leaf spring member 21 is fixed to a drive shaft 22 that is rotated by a predetermined angle by a cam mechanism described later, rotates clockwise around the drive shaft 22 by an angle θ, and pushes the developing device 14 toward the photoconductor 1. The developing roller is brought into contact. A drive and a bias are transmitted to the developing roller of the developing unit 14 that is in contact with the developing device 14, and the toner is attached to the electrostatic latent image on the photoconductor 1 to perform development. After the development, the leaf spring member 21
Rotates counterclockwise about the axis 22 by an angle θ,
The developing device 14 is pressed by the release leaf spring member 23, is separated from the photoconductor 1, and returns to the non-developing position.
【００１３】板バネ部材２１は図３、図４に示すカム機
構により回転運動する。ギヤ２４は図示されていない画
像形成装置本体のモータの駆動により時計方向に回転す
る。その回転をスプリングクラッチ２５によりカム２６
に伝える。スプリングクラッチ２５の片側はカム２６に
接続され、もう一端はスリーブ２７に接続されている。
スリーブ２７にはその表面に爪部２７ａ，２７ｂが設け
られ、ソレノイド２８と連結されたアーム２９の突起部
２９ａがスリーブ２７表面に当接し、ソレノイドのＯ
Ｎ，ＯＦＦによって、アーム２９の突起部２９ａが爪部
２７ａ，２７ｂに引っかかる。その際、スプリングクラ
ッチ２５が緩むので、ギヤ２４からの回転が絶たれ、カ
ム２６が停止する。上記カム２６には、図４に示すよう
に一対の連結されたカムフォロワ３０（３０ａ，３０
ｂ）が当接し、カム２６の回転により角度θだけ駆動軸
２２を中心に動く。そして、カム２６が上死点位置のと
き現像器１４が現像位置にあり、カム２６が下死点位置
のとき現像器１４が非現像位置にある。The leaf spring member 21 is rotated by a cam mechanism shown in FIGS. The gear 24 rotates clockwise by driving a motor (not shown) of the image forming apparatus main body. The rotation is transmitted to the cam 26 by the spring clutch 25.
Tell One side of the spring clutch 25 is connected to the cam 26, and the other end is connected to the sleeve 27.
Claws 27a and 27b are provided on the surface of the sleeve 27, and the protrusion 29a of the arm 29 connected to the solenoid 28 abuts on the surface of the sleeve 27, and the solenoid O
By N and OFF, the protrusion 29a of the arm 29 is hooked on the claws 27a and 27b. At this time, since the spring clutch 25 is loosened, the rotation from the gear 24 is interrupted, and the cam 26 stops. As shown in FIG. 4, the cam 26 has a pair of connected cam followers 30 (30a, 30a).
b) abuts and moves about the drive shaft 22 by the angle θ by the rotation of the cam 26. When the cam 26 is at the top dead center position, the developing device 14 is at the developing position, and when the cam 26 is at the bottom dead center position, the developing device 14 is at the non-developing position.
【００１４】次に、図４を用いてカム２６と一対のカム
フォロワ３０（３０ａ，３０ｂ）の動きを説明する。図
４（ａ）に示すように、一方のカムフォロワ３０ａの一
端側は駆動軸２２に固定され他端側がカム２６に当接さ
れており、カム２６が上死点位置のとき、カムフォロワ
３０ａには駆動軸２２を介して現像器１４を感光体１に
当接するための板バネ部材２１による荷重の力Ｆ1 がか
かる。ここで、カムフォロワが３０ａのみであると、図
４（ｃ）のようにカム２６が上死点から下死点に動く時
に、カムフォロワ３０ａからの力Ｆ1 によってカム２６
が押され空転が起こる。すなわち、カム２６が図４
（ｂ）の下死点から（ａ）の上死点まで回転する場合に
はカムフォロワ３０ａからの力Ｆ1 はカム２６の回転方
向とは逆方向に作用しているが、図４（ｃ）のようにカ
ム２６が上死点から下死点に動く時には、カムフォロワ
３０ａからの力Ｆ1 はカム２６の回転方向に作用し、こ
のとき、カム２６の回転方向とカム２６に連結したスプ
リングクラッチ２５の緩み方向が同方向であるため、カ
ムフォロワ３０ａからの荷重の矢印Ｆ1 方向に働く力
が、前記スプリングクラッチ２５の緩み方向に作用し、
カム２６を空転させてしまう。このカム２６の空転が起
こると、現像器が非現像位置へと急激に移動するため、
衝撃音の発生やトナーの吹き出しが発生する。Next, the movement of the cam 26 and the pair of cam followers 30 (30a, 30b) will be described with reference to FIG. As shown in FIG. 4A, one end of one cam follower 30a is fixed to the drive shaft 22 and the other end is in contact with the cam 26. When the cam 26 is at the top dead center position, the cam follower 30a drive shaft 22 developing device 14 the force F 1 of the load by the leaf spring member 21 to abut against the photosensitive member 1 via the consuming. Here, when the cam follower 30a is only the cam 26 when moving in the bottom dead center from the top dead center cam 26 is as shown in FIG. 4 (c), the by the force F 1 from the cam follower 30a
Is pressed and idling occurs. That is, the cam 26 shown in FIG.
While the force F 1 from the cam follower 30a in the case of rotating from the bottom dead center of (b) to top dead center of (a) is the rotational direction of the cam 26 acting in the opposite direction, and FIG. 4 (c) is in when the cam 26 moves the bottom dead center from the top dead center as the force F 1 from the cam follower 30a acts in the direction of rotation of the cam 26, this time, the spring clutch coupled to the rotational direction and the cam 26 of the cam 26 since the loosening direction 25 in the same direction, the force acting on the direction of arrow F 1 of the load from the cam follower 30a acts on loosening direction of the spring clutch 25,
The cam 26 runs idle. When the idle rotation of the cam 26 occurs, the developing device rapidly moves to the non-developing position.
Impulsive noise and toner blowing occur.
【００１５】そこで本発明では、カム２６の空転を防止
するため、カム機構に一対の連結したカムフォロワ３０
ａ，３０ｂを設け、その一対のカムフォロワ３０ａ，３
０ｂは常にカム２６に当接している構成としたものであ
る。カムフォロワ３０ａに対しカムフォロワ３０ｂは連
結軸３１を支点にして一端をスプリング３２によって連
結され、カムフォロワ３０ａとカムフォロワ３０ｂは、
スプリング３２の力によってカム２６を挾持するように
して常に約１８０°の位置関係でカム２６に当接してい
る。これにより、カムフォロワ３０ｂはカムフォロワ３
０ａと逆の動きをするため、一方のカムフォロワ３０ａ
からカム２６に働く力Ｆ1 が他方のカムフォロワ３０ｂ
からカム２６に働く力Ｆ2 によって相殺される。このた
め、カム２６の空転が無くなりカム２６の回転は円滑に
なる。これにより、現像器の移動が滑らかに行なわれ、
衝撃音の発生やトナーの吹き出しの問題が解消される。Accordingly, in the present invention, a pair of cam followers 30 connected to a cam mechanism is provided to prevent the cam 26 from running idle.
a, 30b, and a pair of cam followers 30a, 30b
Reference numeral 0b denotes a configuration that is always in contact with the cam 26. The cam follower 30a is connected to the cam follower 30a at one end by a spring 32 with the connecting shaft 31 as a fulcrum. The cam follower 30a and the cam follower 30b are
The cam 26 is always held in contact with the cam 26 at a position of about 180 ° so as to clamp the cam 26 by the force of the spring 32. As a result, the cam follower 30b becomes the cam follower 3
0a, the other cam follower 30a
From the force F 1 and the other acting on the cam 26 the cam follower 30b
It is offset by the force F 2 acting on the cam 26 from. For this reason, the idling of the cam 26 is eliminated, and the rotation of the cam 26 becomes smooth. As a result, the movement of the developing device is performed smoothly,
The problem of the generation of impact noise and the blowing of toner is eliminated.
【００１６】次に、図５は請求項３の一実施例を示す接
離機構の概略構成図である。図５及び前述の図２，３に
示すように、この接離機構は、カム２６と、該カム２６
を回転する駆動機構２４，２５，２７〜２９と、駆動軸
２２に一端側を固定され他端側でカム２６に当接するカ
ムフォロワ３０と、駆動軸２２に固定され現像器１４を
押圧する板バネ部材２１を有し、駆動機構でカム２６を
回転し、カムフォロワ３０と駆動軸２２を介して板バネ
部材２１を駆動し現像器１４を接離させる構成である。
カム２６の駆動機構の構成は図３と同様であるが、本実
施例では、カム２６の端面に当接し該カム２６にブレー
キ作用を与える弾性部材４０（例えば金属板バネ）をカ
ムフォロワ３０に設けている。この弾性部材４０はカム
２６の上死点側の端面が通過する際に該端面に当接し、
カム２６にブレーキ作用を与える。このため、カム２６
の空転が抑えられ、回転が円滑になる。これにより、現
像器の移動が滑らかに行なわれ、衝撃音の発生やトナー
の吹き出しの問題が解消される。FIG. 5 is a schematic structural view of a contact / separation mechanism according to a third embodiment of the present invention. In FIG. 5 and FIGS.
As shown, the contact / separation mechanism includes a cam 26 and the cam 26.
Drive mechanisms 24, 25, 27 to 29 for rotating the
22 is fixed at one end to the cam 26 at the other end.
And the developing unit 14 fixed to the drive shaft 22 and the mu follower 30.
It has a leaf spring member 21 for pressing, and the cam 26 is
Rotates, and a leaf spring is rotated through the cam follower 30 and the drive shaft 22.
The structure is such that the member 21 is driven to move the developing device 14 into and out of contact.
Although the configuration of the drive mechanism of the cam 26 is similar to FIG. 3, in this embodiment, brake on the cam 26 abut against the end face of the cam 26
The cam follower 30 is provided with an elastic member 40 (for example, a metal plate spring) that gives a key action . The elastic member 40 comes into contact with the end surface of the cam 26 when the end surface on the top dead center side passes,
The cam 26 is provided with a braking action. For this reason, the cam 26
Is suppressed, and the rotation becomes smooth. Thereby, the movement of the developing device is performed smoothly, and the problem of the generation of the impact sound and the blowing of the toner is solved.
【００１７】[0017]
【発明の効果】以上説明したように、請求項１の画像形
成装置では、現像装置の接離機構を構成するカム機構に
一対の連結したカムフォロワを設け、その一対のカムフ
ォロワは常にカムに当接しているため、一対のカムフォ
ロワでカムを挾み込むようにカムに当接させれば、カム
の空転が防止される。さらに請求項２のように、一対の
連結したカムフォロワの当接位置の関係を、カムの回転
中心に対し約１８０°の位置関係とすることで、カムの
空転がより一層防止され、カムの回転が円滑になる。従
って、請求項１，２の画像形成装置によれば、現像装置
の接離機構にカム機構を用いた際に、カムの空転を防止
でき、現像器の接離移動を円滑に行なうことができ、現
像器の急激な移動による衝撃音の発生や現像剤の吹き出
し等の問題が解消される。As described above, in the image forming apparatus according to the first aspect, a pair of cam followers connected to the cam mechanism constituting the contact / separation mechanism of the developing device are provided, and the pair of cam followers always contact the cam. Therefore, when the cam is brought into contact with the pair of cam followers so as to sandwich the cam, idling of the cam is prevented. Further, by setting the contact position of the pair of connected cam followers to be about 180 ° with respect to the rotation center of the cam, idling of the cam is further prevented, and rotation of the cam is further prevented. Becomes smoother. Therefore, according to the image forming apparatus of the first and second aspects, when the cam mechanism is used as the contact / separation mechanism of the developing device, idling of the cam can be prevented, and the contact / separation movement of the developing device can be performed smoothly. In addition, problems such as generation of an impact sound due to rapid movement of the developing device and blowing of the developer are eliminated.
【００１８】また、請求項３の画像形成装置では、現像
装置の接離機構を構成するカム機構のカムの端面に当接
し該カムにブレーキ作用を与える弾性部材をカムフォロ
ワに設けたことにより、その弾性部材によるブレーキ作
用で上記と同様にカムの空転が防止され、カムの回転が
円滑になる。従って、請求項３の画像形成装置によれ
ば、現像装置の接離機構にカム機構を用いた際に、カム
の空転を防止でき、現像器の接離移動を円滑に行なうこ
とができ、現像器の急激な移動による衝撃音の発生や現
像剤の吹き出し等の問題が解消される。Further, in the image forming apparatus according to the third aspect, the end of the cam of the cam mechanism constituting the contact / separation mechanism of the developing device is abutted.
Since the cam follower is provided with an elastic member that applies a braking action to the cam, the cam is prevented from idling similarly to the above by the braking action of the elastic member, and the rotation of the cam becomes smooth. Therefore, according to the image forming apparatus of the third aspect, when the cam mechanism is used as the contacting / separating mechanism of the developing device, idling of the cam can be prevented, and the contacting / separating movement of the developing device can be performed smoothly. Problems such as generation of an impact sound and blowing of developer due to rapid movement of the container are eliminated.
【図１】本発明の一実施例を示す画像形成装置の概略構
成図である。FIG. 1 is a schematic configuration diagram of an image forming apparatus showing one embodiment of the present invention.
【図２】本発明の一実施例を示す図であって、現像装置
の接離機構の説明図である。FIG. 2 is a view showing one embodiment of the present invention, and is an explanatory view of a contact / separation mechanism of a developing device.
【図３】本発明の一実施例を示す図であって、現像装置
の接離機構に用いられるカム機構の説明図である。FIG. 3 is a view showing one embodiment of the present invention, and is an explanatory view of a cam mechanism used for a contact / separation mechanism of the developing device.
【図４】本発明の一実施例を示す図であって、現像装置
の接離機構に用いられるカム機構の構成及び動作の説明
図である。FIG. 4 is a view showing one embodiment of the present invention, and is an explanatory view of the configuration and operation of a cam mechanism used for a contact / separation mechanism of a developing device.
【図５】本発明の別の実施例を示す図であって、現像装
置の接離機構の概略構成図である。FIG. 5 is a view showing another embodiment of the present invention, and is a schematic configuration diagram of a contact / separation mechanism of a developing device.
１・・・感光体 ２・・・給紙カセット ５・・・給紙ローラ ６・・・レジストローラ ７・・・転写器 ８・・・定着器 ９・・・第１帯電器 １０・・・第１露光系 １１・・・第１現像器 １２・・・第２帯電器 １３・・・第２露光系 １４・・・第２現像器 １５・・・クリーニングユニット １６・・・除電器 １７・・・イメージセンサ ２１・・・板バネ部材 ２２・・・駆動軸 ２３・・・解除用板バネ部材 ２４・・・ギヤ ２５・・・スプリングクラッチ ２６・・・カム ２７・・・スリーブ ２８・・・ソレノイド ２９・・・アーム ３０（３０ａ，３０ｂ）・・・カムフォロワ ３１・・・連結軸 ３２・・・スプリング ４０・・・弾性部材 DESCRIPTION OF SYMBOLS 1 ... Photoconductor 2 ... Paper feed cassette 5 ... Paper feed roller 6 ... Registration roller 7 ... Transfer device 8 ... Fixing device 9 ... 1st charging device 10 ... 1st exposure system 11 ... 1st developing device 12 ... 2nd charging device 13 ... 2nd exposure system 14 ... 2nd developing device 15 ... cleaning unit 16 ... static eliminator 17. ..Image sensor 21 ... leaf spring member 22 ... drive shaft 23 ... leaving leaf spring member 24 ... gear 25 ... spring clutch 26 ... cam 27 ... sleeve 28 ... -Solenoid 29-Arm 30 (30a, 30b)-Cam follower 31-Connection shaft 32-Spring 40-Elastic member
───────────────────────────────────────────────────── フロントページの続き (72)発明者 島 信広 東京都大田区中馬込１丁目３番６号・株 式会社リコー内 (72)発明者 高垣 博光 東京都大田区中馬込１丁目３番６号・株 式会社リコー内 (72)発明者 西土 和宏 東京都大田区中馬込１丁目３番６号・株 式会社リコー内 (72)発明者 岩田 尚貴 東京都大田区中馬込１丁目３番６号・株 式会社リコー内 (72)発明者 矢野 英俊 東京都大田区中馬込１丁目３番６号・株 式会社リコー内 (56)参考文献 特開 昭62−115478（ＪＰ，Ａ) 実開 平３−96664（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 15/08 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Nobuhiro Shima 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (72) Hiromitsu Takagaki 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (72) Kazuhiro Nishichi, Inventor 1-3-6 Nakamagome, Ota-ku, Tokyo Tokyo, Japan Ricoh (72) Naoki Iwata, 1-3-6 Nakamagome, Ota-ku, Tokyo Ricoh Co., Ltd. (72) Inventor Hidetoshi Yano 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (56) References JP-A-62-115478 (JP, A) Hei 3-96664 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) G03G 15/08
Claims (3)
するための現像装置を有し、該現像装置を感光体ドラム
に対し近接する現像位置と離間する非現像位置に移動可
能に構成し、その接離機構にカム機構を用いた画像形成
装置において、 前記接離機構のカム機構に一対の連結したカムフォロワ
を設け、その一対のカムフォロワは常にカムに当接して
いることを特徴とする画像形成装置。A developing device for visualizing a latent image formed on the photosensitive drum, wherein the developing device is movable to a non-developing position separated from a developing position close to the photosensitive drum. In the image forming apparatus using a cam mechanism as the contact / separation mechanism, a pair of cam followers connected to the cam mechanism of the contact / separation mechanism are provided, and the pair of cam followers is always in contact with the cam. Image forming apparatus.
対の連結したカムフォロワの当接位置の関係は、カムの
回転中心に対し、約１８０°の位置関係にあることを特
徴とする画像形成装置。2. The image forming apparatus according to claim 1, wherein the contact position of the pair of connected cam followers is about 180 ° relative to the rotation center of the cam. apparatus.
するための現像装置を有し、該現像装置を感光体ドラム
に対し近接する現像位置と離間する非現像位置に移動可
能に構成し、その接離機構にカム機構を用いた画像形成
装置において、前記接離機構は、カムと、該カムを回転する駆動機構
と、駆動軸に一端側を固定され他端側で前記カムに当接
するカムフォロワと、前記駆動軸に固定され現像装置を
押圧する板バネ部材を有し、前記駆動機構でカムを回転
し、カムフォロワと駆動軸を介して前記板バネ部材を駆
動し現像装置を接離させる構成であり、且つ、 前記接離
機構のカムの端面に当接し該カムにブレーキ作用を与え
る弾性部材をカムフォロワに設けたことを特徴とする画
像形成装置。3. A developing device for visualizing a latent image formed on a photosensitive drum, the developing device being movable to a non-developing position separated from a developing position close to the photosensitive drum. An image forming apparatus comprising a cam mechanism as the contact / separation mechanism , wherein the contact / separation mechanism comprises a cam and a driving mechanism for rotating the cam.
And one end is fixed to the drive shaft and abuts on the cam at the other end.
And a developing device fixed to the drive shaft.
It has a leaf spring member to press and rotates the cam by the drive mechanism
Drive the leaf spring member via a cam follower and a drive shaft.
A configuration in which the dynamic to or away the developing device, and provides a braking action to the contact with the cam on the end face of the cam of said moving mechanism
An image forming apparatus characterized by providing a cam follower elastic member that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15764693A JP3243064B2 (en) | 1993-06-28 | 1993-06-28 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15764693A JP3243064B2 (en) | 1993-06-28 | 1993-06-28 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0772720A JPH0772720A (en) | 1995-03-17 |
| JP3243064B2 true JP3243064B2 (en) | 2002-01-07 |
Family
ID=15654280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15764693A Expired - Lifetime JP3243064B2 (en) | 1993-06-28 | 1993-06-28 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3243064B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4977499B2 (en) | 2007-03-13 | 2012-07-18 | 株式会社リコー | Image forming apparatus |
| JP7172780B2 (en) * | 2019-03-19 | 2022-11-16 | ブラザー工業株式会社 | image forming device |
-
1993
- 1993-06-28 JP JP15764693A patent/JP3243064B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0772720A (en) | 1995-03-17 |
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