JP2517532Y2 - Development device - Google Patents

Development device

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Publication number
JP2517532Y2
JP2517532Y2 JP1988056579U JP5657988U JP2517532Y2 JP 2517532 Y2 JP2517532 Y2 JP 2517532Y2 JP 1988056579 U JP1988056579 U JP 1988056579U JP 5657988 U JP5657988 U JP 5657988U JP 2517532 Y2 JP2517532 Y2 JP 2517532Y2
Authority
JP
Japan
Prior art keywords
developing device
operating position
developing
photosensitive drum
returning
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
Application number
JP1988056579U
Other languages
Japanese (ja)
Other versions
JPH01162361U (en
Inventor
達也 新田
保人 高橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP1988056579U priority Critical patent/JP2517532Y2/en
Publication of JPH01162361U publication Critical patent/JPH01162361U/ja
Application granted granted Critical
Publication of JP2517532Y2 publication Critical patent/JP2517532Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【考案の詳細な説明】 [産業上の利用分野] この考案は複数の色の画像を形成可能な電子写真複写
機等に使用される現像装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a developing device used in an electrophotographic copying machine or the like capable of forming images of a plurality of colors.

[従来の技術] 従来、この種の現像装置としては、感光体ドラムの回
転方向に沿って配設された異なった色のトナーを使用す
る複数の現像器を備えたものがあり、これらの現像器と
しては、例えば磁気ブラシ現像法を採用したものが用い
られる。上記現像装置の場合には、1つの現像器が現像
を行なっている間に、他の現像器が感光体ドラムに近接
していると、次のような問題点が生じる。すなわち、他
の現像器が現像を行なっている現像器より感光体ドラム
の回転方向の上流側にあると、この現像器の磁気ブラシ
が感光体ドラム上の静電潜像を摺擦するため、静電潜像
が乱れたり、感光体ドラム上に磁気ブラシのトナーが付
着して混色を生じ、画質が劣化するという問題点があっ
た。また、逆に他の現像器が現像を行なっている現像器
より感光体ドラムの回転方向下流側にあると、この現像
器の磁気ブラシが感光体ドラム上に既に現像されたトナ
ー像を乱したり、感光体ドラム上に磁気ブラシのトナー
が付着して混色を生じ、やはり画質の劣化をきたすとい
う問題点があった。
[Prior Art] Conventionally, as a developing device of this type, there is a developing device provided with a plurality of developing devices arranged along the rotational direction of a photosensitive drum and using toners of different colors. As the container, for example, a container adopting a magnetic brush developing method is used. In the case of the developing device, if one developing device is developing and another developing device is close to the photosensitive drum, the following problems occur. That is, when the other developing device is on the upstream side in the rotation direction of the photosensitive drum with respect to the developing device that is developing, since the magnetic brush of this developing device rubs the electrostatic latent image on the photosensitive drum, There are problems that the electrostatic latent image is disturbed and that the toner of the magnetic brush adheres to the photosensitive drum to cause color mixing, resulting in deterioration of image quality. On the other hand, if the other developing device is located downstream of the developing device in the rotational direction of the photoconductor drum, the magnetic brush of this developing device disturbs the toner image already developed on the photoconductor drum. However, there is a problem that toner of the magnetic brush adheres to the photosensitive drum to cause color mixing, which also deteriorates image quality.

そこで、複数の現像器を備えた現像装置にあっては、
各現像器を個別に感光体ドラムに近接した作動位置に移
動可能とし、1つの現像器で現像を行なっている間は、
他の現像器を感光体ドラムから離間させておくように構
成したものがある。すなわち、第6図に示すように、感
光体ドラム40の近傍に上下に配設された2つの現像器4
1、42を備えており、各現像器41、42は、感光体ドラム4
0に対して切離する方向に移動自在に支持されている。
上記現像器41、42は、スプリング43、44によって感光体
ドラム40から離間する方向に付勢されているとともに、
現像器41、42の背面側には、偏心位置が180度異なって
回転するように駆動軸45、45に固着された偏心カム46、
47がそれぞれ配設されている。しかして、上記駆動軸4
5、45を回転させることにより、偏心カム46、47の先端
によって一方の現像器41又は42の背面を押圧して、この
現像器41又は42を感光体ドラム40に近接した作動位置に
移動可能となっている。
Therefore, in a developing device equipped with a plurality of developing devices,
Each developing unit can be individually moved to an operating position close to the photosensitive drum, and while developing with one developing unit,
There is one in which another developing device is configured to be separated from the photosensitive drum. That is, as shown in FIG. 6, the two developing devices 4 arranged vertically near the photoconductor drum 40 are provided.
1 and 42, each developing device 41, 42 is a photosensitive drum 4
It is movably supported in a direction separating from 0.
The developing devices 41, 42 are biased by springs 43, 44 in a direction away from the photosensitive drum 40,
On the back side of the developing devices 41, 42, an eccentric cam 46 fixed to the drive shafts 45, 45 so that the eccentric positions rotate 180 degrees differently,
47 are arranged respectively. Then, the above drive shaft 4
By rotating 5, 45, the back surface of one of the developing devices 41 or 42 can be pressed by the tips of the eccentric cams 46, 47, and the developing device 41 or 42 can be moved to an operating position close to the photosensitive drum 40. Has become.

[考案が解決しようとする課題] しかし、このような従来技術の場合には、次のような
問題点を有している。すなわち、現像器41、42の感光体
ドラム40から離間した非作動位置への移動を、スプリン
グ43、44の弾発力のみによって行なっているため、現像
器41、42を使用している間にスプリング43、44にへたり
が生じて塑性変形し、スプリング43、44の弾発力が弱く
なる。そのため、現像器41又は42が感光体ドラム40から
十分離間しなくなり、この現像器41又は42の磁気ブラシ
が感光体ドラム40表面と接触してトナーの混色が生じる
という問題点があった。
[Problems to be Solved by the Invention] However, such a conventional technique has the following problems. That is, since the developing devices 41, 42 are moved to the non-operating position separated from the photoconductor drum 40 only by the elastic force of the springs 43, 44, the developing devices 41, 42 are not used while they are in use. The springs 43 and 44 are settled and plastically deformed, and the elastic force of the springs 43 and 44 is weakened. Therefore, the developing device 41 or 42 is not sufficiently separated from the photosensitive drum 40, and the magnetic brush of the developing device 41 or 42 comes into contact with the surface of the photosensitive drum 40 to cause color mixing of toner.

[課題を解決するための手段] そこで、この考案は、上記従来技術の問題点を解決す
るためになされたもので、その目的とするところは、現
像器の非作動位置への復帰動作を補助する付勢部材を設
けることにより、現像器の非作動位置へ復帰させる弾性
部材のへたりを防止することができ、現像器の非作動位
置への復帰動作が確実に行なえ、混色等が生じることの
ない現像装置を提供することにある。
[Means for Solving the Problem] Therefore, the present invention has been made in order to solve the above-mentioned problems of the prior art, and its purpose is to assist the returning operation of the developing device to the non-operating position. By providing a biasing member that prevents the elastic member from returning to the non-operating position of the developing device, it is possible to reliably perform the returning operation of the developing device to the non-operating position and to cause color mixing. It is to provide a developing device that does not include

すなわち、この考案は、複数の現像器を備え、各現像
器に押動部材を接触させることによってのみ当該各現像
器を作動位置に別個に押動するとともに、同じく各現像
器から押動部材を退避させ、弾性部材によって非作動位
置に復帰させるようにした現像装置において、現像器を
非作動位置に復帰させる際にのみ当該現像器に作用し、
前記現像器を非作動位置に復帰させる押動部材の退避動
作に連動して当該現像器を非作動位置側へ初期移動を開
始させるように現像器の一部を押動する本体に揺動自在
に係止された初期移動部材を設けるように構成されてい
る。
That is, the present invention includes a plurality of developing devices, and pushes each developing device to the operating position separately only by bringing the pushing member into contact with each developing device, and also the pushing member is pushed from each developing device. In the developing device that is retracted and returned to the non-operating position by the elastic member, acts on the developing device only when returning the developing device to the non-operating position,
It is swingable to the main body that pushes a part of the developing device so as to start the initial movement of the developing device to the non-operating position side in conjunction with the retracting operation of the pushing member that returns the developing device to the non-operating position. It is configured to provide an initial moving member locked to.

上記現像装置としては、例えば現像器を2つ備えたも
のが用いられるが、これに限定されるものではなく、現
像器を3つ以上備えたものでも勿論良い。
As the developing device, for example, one having two developing devices is used, but the developing device is not limited to this, and of course, one having three or more developing devices may be used.

上記押動部材としては、例えば駆動軸に固着された偏
心カムが用いられるが、これに限定されるものではな
く、現像器を作動位置まで押動可能なものであれば、他
の部材を用いても勿論よい。
As the pushing member, for example, an eccentric cam fixed to the drive shaft is used, but the pushing member is not limited to this, and another member may be used as long as it can push the developing device to the operating position. But of course

また、上記弾性部材としては、例えば現像器の背面に
連結されたスプリングが用いられるが、現像器を非作動
位置まで移動可能なものであれば、他の弾性部材を用い
ても勿論良い。
Further, as the elastic member, for example, a spring connected to the back surface of the developing device is used, but other elastic members may be used as long as the developing device can be moved to the non-operating position.

さらに、上記付勢部材としては、例えば押動部材とし
てカムの回転を連動して回動される部材が用いられ、カ
ムが現像器の非作動位置側への回転と連動して、現像器
を支持するシャフトを非作動位置側へと付勢する腕部を
備えたものが用いられる。
Further, as the urging member, for example, a member that is rotated as the pushing member is rotated in association with the rotation of the cam is used. The one having an arm portion for urging the supporting shaft toward the non-operating position side is used.

[作用] この考案においては、現像器を弾性部材の弾発力によ
って非作動位置へと移動させる際にのみ、押動部材と連
動する初期移動部材によって現像器を非作動位置側へ初
期移動を開始させるように現像器の一部を押動すること
により、現像器の弾性部材による非作動位置への移動
を、初期移動部材によって補助することができるため、
現像器を非作動位置に復帰させる弾性部材のへたりを防
止することができ、現像器の非作動位置への復帰動作が
確実に行なえ、混色等が生じることのない現像装置を提
供することができる。
[Operation] In this invention, only when the developing device is moved to the non-operating position by the elastic force of the elastic member, the initial moving member interlocking with the pushing member moves the developing device to the non-operating position side. By pushing a part of the developing device so as to start, the movement of the developing device to the non-operating position by the elastic member can be assisted by the initial moving member.
(EN) It is possible to prevent the elastic member that returns the developing device to the non-operating position from sagging, to reliably perform the returning operation of the developing device to the non-operating position, and to provide a developing device in which color mixing does not occur. it can.

また、この考案では、現像器を非作動位置側へ初期移
動を開始させるように現像器の一部を押動する本体に揺
動自在に係止された初期移動部材が、現像器を非作動位
置に復帰させる際にのみ当該現像器に作用し、この初期
移動部材は、現像器を作動位置に押動する際に当該現像
器に作用することがないので、当該初期移動部材によっ
て現像器の非作動位置への復帰動作を確実に行なう構成
を採りつつ、この初期移動部材は、押動部材によって現
像器を作動位置に押動する際に当該現像器に作用しない
ので、初期移動部材が現像器と機械的に連結されること
がなく、初期移動部材が現像器の移動の支障となること
がない。
Further, in this invention, the initial moving member, which is swingably locked to the main body that pushes a part of the developing device so as to start the initial movement of the developing device to the non-operating position side, deactivates the developing device. The initial moving member does not act on the developing device when pushing the developing device to the operating position only when returning to the position, and thus the initial moving member does not act on the developing device. The initial moving member does not act on the developing device when the developing device is pushed to the operating position by the pushing member while adopting a structure for surely performing the returning operation to the non-operating position. There is no mechanical connection with the developing device, and the initial moving member does not hinder the movement of the developing device.

[実施例] 以下にこの考案を図示の実施例に基づいて説明する。[Embodiment] The present invention will be described below based on the illustrated embodiment.

第5図はこの考案に係る現像装置を適用し得る複数の
色の画像を形成可能な電子写真複写機を示すものであ
る。図において、1は図示しない原稿を載置する原稿載
置台ガラスであり、この原稿載置台ガラス上1に載置さ
れた原稿(図示せず)は、光源2によって照明されてそ
の反射光像がミラー及びレンズからなる走査光学系3を
介して感光体ドラム4上に投影される。この感光体ドラ
ム4は、原稿の画像の露光に先だって予め帯電器5によ
ってその表面が一様に帯電されており、その後原稿の画
像が露光されて静電潜像が形成される。
FIG. 5 shows an electrophotographic copying machine capable of forming images of a plurality of colors to which the developing device according to the present invention can be applied. In the figure, reference numeral 1 denotes an original placing table glass on which an original (not shown) is placed. An original (not shown) placed on the original placing table glass 1 is illuminated by a light source 2 and a reflected light image thereof is formed. It is projected onto the photosensitive drum 4 via the scanning optical system 3 including a mirror and a lens. Prior to the exposure of the image of the original, the surface of the photosensitive drum 4 is uniformly charged by the charger 5, and then the image of the original is exposed to form an electrostatic latent image.

この感光体ドラム4上に形成された静電潜像は、この
考案の一実施例に係る現像装置6のいずれかの現像器
7、8によって現像される。上記現像装置6は、図示の
実施例では異なった色の現像剤を収納した2つの現像器
7、8を有しており、各現像器7、8が個別に感光体ド
ラム4に近接した作動位置に移動可能となっている。い
ずれかの現像器7、8によって現像された画像は、給紙
カセット9から給紙ロール10により送出され、レジスト
ロール11によって所定のタイミングで感光体ドラム4の
表面へと搬送される転写用紙12上に、転写コロトロン13
の帯電によって転写される。その後、上記転写用紙12
は、定着器14によって転写されたトナー像が定着され、
トレイ15上に排出される。図中、16はクリーナーを示し
ている。
The electrostatic latent image formed on the photosensitive drum 4 is developed by one of the developing devices 7 and 8 of the developing device 6 according to the embodiment of the invention. In the illustrated embodiment, the developing device 6 has two developing devices 7 and 8 containing different color developers, and the developing devices 7 and 8 are individually operated in the proximity of the photoconductor drum 4. It can be moved to any position. The image developed by one of the developing devices 7 and 8 is sent from the paper feed cassette 9 by the paper feed roll 10 and is transferred by the registration roll 11 to the surface of the photosensitive drum 4 at a predetermined timing. Transfer Corotron 13 on
It is transferred by the charging of. Then, transfer sheet 12
Fixes the toner image transferred by the fixing device 14,
It is discharged onto the tray 15. In the figure, 16 indicates a cleaner.

ところで、上記現像器7、8は、第4図に示すよう
に、上下に間隔をおいて配置されており、各現像器7、
8は、側面に突設されたロッド17、18を介して複写機の
フレーム21に穿設された長孔20、20…に感光体ドラム4
と接離する矢印方向に摺動自在に装着されている。上記
各現像器7、8は、図示しないが周知のように、現像器
本体内部に回動可能に設けられた現像ロールと、この現
像ロールの背面側に回動可能に設けられ、トナーと磁性
キャリアとからなる現像剤を現像ロールへと供給するパ
ドルと、このパドルの背面側に回動可能に設けられて上
記現像剤を混合するミキサとでその主要部が構成されて
いる。
By the way, as shown in FIG. 4, the developing devices 7 and 8 are arranged vertically with a space therebetween.
Reference numeral 8 denotes a photosensitive drum 4 in elongated holes 20, 20 ... Bored in a frame 21 of a copying machine via rods 17 and 18 projecting from side surfaces.
It is mounted slidably in the direction of the arrow that touches and separates from. As is well known, although not shown, each of the developing devices 7 and 8 is a developing roll rotatably provided inside the developing device main body, and is rotatably provided on the back side of the developing roll so as to rotate the toner and the magnetic field. A paddle that supplies a developer including a carrier to a developing roll and a mixer that is rotatably provided on the back surface side of the paddle and that mixes the developer constitute a main part.

上記各現像器7、8は、第3図に示すように、その背
面側に設けられ、偏心位置が180度異なるように回転す
る押動部材としての偏心カム22、23によって、感光体ド
ラム4に近接した作動位置に移動可能となっており、こ
れらのカム22、23は、フレーム21間に所定のタイミング
で回転可能に設けられた駆動軸24、25に固着されてい
る。また、各現像器7、8の背面には、現像器7、8を
感光体ドラム4から離間した非作動位置側へ復帰させる
弾性部材としてのスプリング26、27が設けられている、
これらのスプリング26、27は、一端が現像器7、8の背
面に他端が複写機のハウジング28に固定されている。
As shown in FIG. 3, each of the developing devices 7 and 8 is provided on the back side thereof, and is provided with eccentric cams 22 and 23 as pushing members which rotate so that the eccentric positions are different by 180 degrees. The cams 22 and 23 are fixed to drive shafts 24 and 25 rotatably provided between the frames 21 at a predetermined timing. Further, springs 26 and 27 as elastic members for returning the developing devices 7 and 8 to the non-operating position side separated from the photosensitive drum 4 are provided on the back surfaces of the developing devices 7 and 8.
One end of each of the springs 26 and 27 is fixed to the back surface of the developing device 7 or 8, and the other end is fixed to the housing 28 of the copying machine.

この実施例では、現像器を非作動位置に復帰させる際
にのみ当該現像器に作用し、前記現像器を非作動位置に
復帰させる押動部材の退避動作に連動して当該現像器を
非作動位置側へ初期移動を開始させるように現像器の一
部を押動する本体に揺動自在に係止された初期移動部材
としての付勢部材が設けられている。上記付勢部材は、
現像器7及び8の両方に設けられているが、以下現像器
7について説明するが、現像器8もまったく同様に構成
されている。すなわち、第2図に示すように、現像器7
の一側には、ロッド17と駆動軸24との間に平板状の付勢
部材29が設けられており、この付勢部材29は、フレーム
21に枢着されている。上記付勢部材29は、第1図に示す
ように、ピン30を中心として回動自在となっており、そ
の一端には、カム22と当接する第1の腕部31が下方に突
設されている。また、付勢部材29の先端部には、付勢部
材29の回動にともなって、現像器7に固着されたロッド
17を現像器7の非作動位置側へ付勢する第2の腕部32を
備えている。この第2の腕部32は、湾曲した内側縁32a
を有しており、この湾曲した内側縁32aは、付勢部材29
が反時計方向に回動するに伴って、ピン30を中心とした
円弧よりも内側に湾曲した形状となっている。さらに、
上記付勢部材29の基端部上端には、スプリング33が連結
されており、付勢部材29は、ピン30を中心として時計周
り方向に回動するように付勢されている。
In this embodiment, the developing device is operated only when returning the developing device to the non-operating position, and the developing device is non-operating in association with the retracting operation of the pushing member for returning the developing device to the non-operating position. A biasing member is provided as an initial moving member that is swingably locked to the main body that pushes a part of the developing device so as to start the initial movement toward the position side. The biasing member is
Although provided in both the developing devices 7 and 8, the developing device 7 will be described below, but the developing device 8 is also configured in exactly the same manner. That is, as shown in FIG.
On one side, a flat plate-shaped urging member 29 is provided between the rod 17 and the drive shaft 24.
It is pivotally attached to 21. As shown in FIG. 1, the biasing member 29 is rotatable about a pin 30, and at one end thereof, a first arm portion 31 that abuts on the cam 22 is projected downward. ing. In addition, the tip of the urging member 29 has a rod fixed to the developing device 7 as the urging member 29 rotates.
A second arm portion 32 for urging 17 toward the non-operating position side of the developing device 7 is provided. The second arm 32 has a curved inner edge 32a.
The curved inner edge 32a has a biasing member 29.
As it rotates counterclockwise, it has a shape curved inward of an arc centered on the pin 30. further,
A spring 33 is connected to the upper end of the base end portion of the biasing member 29, and the biasing member 29 is biased to rotate clockwise around the pin 30.

以上の構成において、この実施例に係る現像装置で
は、次のようにして、現像器の移動が行なわれる。すな
わち、一方の現像器7又は8を感光体ドラム4に近接し
た作動位置に移動させるには、駆動軸24又は25を回転さ
せることによりカム22又は23を回転させ、このカム22又
は23の回転によって現像器7又は8をスプリング26、27
の弾発力に抗して、作動位置に移動させる。この状態
で、感光体ドラム4に近接した作動位置にある現像器7
又は8によって、前記の如く感光体ドラム4上に形成さ
れた静電潜像を現像する。
In the developing device having the above structure, the developing device is moved in the following manner. That is, in order to move the one developing device 7 or 8 to the operating position close to the photosensitive drum 4, the drive shaft 24 or 25 is rotated to rotate the cam 22 or 23, and the rotation of the cam 22 or 23 is changed. Depending on the developing device 7 or 8, the spring 26, 27
It moves to the operating position against the elastic force of. In this state, the developing device 7 in the operating position close to the photosensitive drum 4
Alternatively, the electrostatic latent image formed on the photosensitive drum 4 as described above is developed by 8.

次に、この現像器7又は8による現像動作が終了して
現像器を非作動位置に移動させるには、駆動軸24又は25
によってカム22又は23を回転させ、スプリング33又は34
の弾発力によって現像器7又は8を感光体ドラム4から
離間した非作動位置に移動させる。今、現像器7を非作
動位置に移動させる場合について説明する。その際、上
記カム22には、第1図に示すように、付勢部材29の第2
の腕32が当接しているため、カム22の回転に伴って付勢
部材29は、スプリング33の弾発力に抗して反時計周り方
向に回動する。従って、この付勢部材29の第2の腕32
は、その内側面32aによって現像器7のロッド17を非作
動位置側へ付勢させるので、スプリング26による現像器
7の復帰動作の初期に、現像器7は、付勢部材29によっ
て非作動位置側へ付勢されるため、容易に移動を開始す
る。すなわち、現像器7の非作動位置への移動に当たっ
て、移動開始時の静摩擦係数は大きいが、その移動開始
時において現像器7は、付勢部材29によって非作動位置
側へ付勢されるので、その移動は容易に行なわれる。一
旦現像器7が移動を開始すれば、動摩擦計数は小さいた
め、スプリング26の弾発力のみによっても現像器7の移
動は容易に行える。従って、現像器7を非作動位置へ移
動させる際のスプリング26の負荷は小さいので、長期間
使用した場合でも、スプリング26のへたりは、ほとんど
生じることなく、安定して現像器の移動を行なうことが
できる。
Next, in order to move the developing device to the non-operating position after the developing operation by the developing device 7 or 8 is completed, the drive shaft 24 or 25
Rotate the cam 22 or 23 with the spring 33 or 34
The developing device 7 or 8 is moved to a non-operating position separated from the photosensitive drum 4 by the elastic force of. Now, a case where the developing device 7 is moved to the non-operating position will be described. At that time, as shown in FIG.
Since the arm 32 is in contact, the biasing member 29 rotates counterclockwise against the elastic force of the spring 33 as the cam 22 rotates. Therefore, the second arm 32 of the biasing member 29 is
Urges the rod 17 of the developing device 7 toward the non-operating position side by the inner side surface 32a thereof. Since it is biased to the side, it easily starts moving. That is, when the developing device 7 is moved to the non-operating position, the static friction coefficient at the start of the movement is large, but the developing device 7 is biased toward the non-operating position by the biasing member 29 at the start of the movement. The movement is easy. Once the developing device 7 starts to move, since the dynamic friction coefficient is small, the developing device 7 can be easily moved only by the elastic force of the spring 26. Therefore, since the load of the spring 26 is small when the developing device 7 is moved to the non-operating position, the spring 26 does not almost sag even when it is used for a long time, and the developing device can be moved stably. be able to.

このように、現像器7又は8を非作動位置へ復帰させ
る際に、カム22又は23の動きと連動する付勢部材29によ
って、現像器7又は8を非作動位置側へと付勢するよう
にしたので、現像器7又は8の非作動位置への復帰を容
易に行なうことができる。そのため、現像器7、8の復
帰移動に伴うスプリング26又は27のへたりを防止するこ
とができ、長期間にわたって現像器7又は8の切換動作
を安定して行なうことができる。そのため、現像器7又
は8を非作動位置へ確実に移動させることができるの
で、現像器の非作動位置への移動不良に基づくトナーの
混色等が生じるのを確実に防止することができる。
Thus, when returning the developing device 7 or 8 to the non-operating position, the biasing member 29 interlocked with the movement of the cam 22 or 23 biases the developing device 7 or 8 to the non-operating position side. Therefore, the developing device 7 or 8 can be easily returned to the non-operating position. Therefore, it is possible to prevent the spring 26 or 27 from settling due to the returning movement of the developing device 7 or 8, and it is possible to stably perform the switching operation of the developing device 7 or 8 for a long period of time. Therefore, since the developing device 7 or 8 can be reliably moved to the non-operating position, it is possible to reliably prevent the color mixture of toner or the like due to the improper movement of the developing device to the non-operating position.

[考案の効果] この考案は以上の構成及び作用よりなるもので、現像
器を非作動位置に復帰させる弾性部材のへたりを防止す
ることができ、現像器の非作動位置への復帰動作が確実
に行なえ、混色等が生じることのない現像装置を提供す
ることができる。
[Advantages of the Invention] The present invention has the above-described configuration and operation, and can prevent the elastic member that returns the developing device to the non-operating position from sagging, and the returning operation of the developing device to the non-operating position. It is possible to provide a developing device that can be surely performed and in which color mixing does not occur.

また、この考案では、現像器を非作動位置側へ初期移
動を開始させるように現像器の一部を押動する本体に揺
動自在に係止された初期移動部材が、現像器を非作動位
置に復帰させる際にのみ当該現像器に作用し、この初期
移動部材は、現像器を作動位置に押動する際に当該現像
器に作用することがないので、当該初期移動部材によっ
て現像器の非作動位置への復帰動作を確実に行なう構成
を採りつつ、この初期移動部材は、押動部材によって現
像器を作動位置に押動する際に当該現像器に作用しない
ので、初期移動部材が現像器と機械的に連結されること
がなく、初期移動部材が現像器の移動の支障となること
がない。
Further, in this invention, the initial moving member, which is swingably locked to the main body that pushes a part of the developing device so as to start the initial movement of the developing device to the non-operating position side, deactivates the developing device. The initial moving member does not act on the developing device when pushing the developing device to the operating position only when returning to the position, and thus the initial moving member does not act on the developing device. The initial moving member does not act on the developing device when the developing device is pushed to the operating position by the pushing member while adopting a structure for surely performing the returning operation to the non-operating position. There is no mechanical connection with the developing device, and the initial moving member does not hinder the movement of the developing device.

【図面の簡単な説明】[Brief description of drawings]

第1図はこの考案の一実施例に係る現像装置の要部を示
す正面図、第2図は同現像装置を示す平面図、第3図は
同現像装置の側面図、第4図は同現像装置の斜視図、第
5図は同現像装置を適用し得る電子写真複写機を示す構
成図、第6図は従来の現像装置を示す概略図である。 [符号の説明] 6……現像装置 7、8……現像器 22、23……カム 26、27……スプリング 29……付勢部材
FIG. 1 is a front view showing a main part of a developing device according to an embodiment of the present invention, FIG. 2 is a plan view showing the developing device, FIG. 3 is a side view of the developing device, and FIG. FIG. 5 is a perspective view of the developing device, FIG. 5 is a configuration diagram showing an electrophotographic copying machine to which the developing device can be applied, and FIG. 6 is a schematic diagram showing a conventional developing device. [Explanation of symbols] 6 ... Developing device 7, 8 ... Developing device 22, 23 ... Cam 26, 27 ... Spring 29 ... Biasing member

Claims (1)

(57)【実用新案登録請求の範囲】(57) [Scope of utility model registration request] 【請求項1】複数の現像器を備え、各現像器に押動部材
を接触させることによってのみ当該各現像器を作動位置
に別個に押動するとともに、同じく各現像器から押動部
材を退避させ、弾性部材によって非作動位置に復帰させ
るようにした現像装置において、現像器を非作動位置に
復帰させる際にのみ当該現像器に作用し、前記現像器を
非作動位置に復帰させる押動部材の退避動作に連動して
当該現像器を非作動位置側へ初期移動を開始させるよう
に現像器の一部を押動する本体に揺動自在に係止された
初期移動部材を設けたことを特徴とする現像装置。
1. A plurality of developing devices are provided, and each developing device is separately pushed to an operating position only by bringing the pushing member into contact with each developing device, and the pushing member is also retracted from each developing device. In the developing device configured to return to the non-operating position by the elastic member, the pushing member that acts on the developing device only when returning the developing device to the non-operating position and returns the developing device to the non-operating position. The initial moving member that is swingably locked to the main body that pushes a part of the developing device so as to start the initial moving of the developing device to the non-operating position side in conjunction with the retracting operation of Characteristic developing device.
JP1988056579U 1988-04-28 1988-04-28 Development device Expired - Lifetime JP2517532Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1988056579U JP2517532Y2 (en) 1988-04-28 1988-04-28 Development device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988056579U JP2517532Y2 (en) 1988-04-28 1988-04-28 Development device

Publications (2)

Publication Number Publication Date
JPH01162361U JPH01162361U (en) 1989-11-13
JP2517532Y2 true JP2517532Y2 (en) 1996-11-20

Family

ID=31282449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988056579U Expired - Lifetime JP2517532Y2 (en) 1988-04-28 1988-04-28 Development device

Country Status (1)

Country Link
JP (1) JP2517532Y2 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62134654A (en) * 1985-12-09 1987-06-17 Canon Inc Image forming device
JPS62199746U (en) * 1986-06-09 1987-12-19

Also Published As

Publication number Publication date
JPH01162361U (en) 1989-11-13

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