JPS61230178A - Developing device - Google Patents
Developing deviceInfo
- Publication number
- JPS61230178A JPS61230178A JP60069978A JP6997885A JPS61230178A JP S61230178 A JPS61230178 A JP S61230178A JP 60069978 A JP60069978 A JP 60069978A JP 6997885 A JP6997885 A JP 6997885A JP S61230178 A JPS61230178 A JP S61230178A
- Authority
- JP
- Japan
- Prior art keywords
- developing
- sleeve
- developing device
- developer
- collection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0942—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with means for preventing toner scattering from the magnetic brush, e.g. magnetic seals
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
本発明は、一般にはカラー電子写真複写装置、コンピュ
ータ及びファクシミリ等の出力部を構成するカラー記録
装置に好適に使用することのできる現像装置に関するも
のであり、特に上記の如き画像形成装置において、複数
の現像器を搬送装置に搭載し所望の現像器を潜像担持体
、即ち、被現像体に対向した位置に移動させ現像を行な
わしめるようにした現像装置であって、現像装置の運動
、停止］二に伴なう現像剤の飛散及び混色を防！卜する
ことのできる現像装置に関するものである。
本発明に係る現像装置は、搬送装置が回転体であり各現
像器が円軌道に沿って移動するようにした回転現像装置
と共に使用することもでき、又搬送装置が回転体以外の
無端循環移動体であり各現像器が例えば楕円軌道等の非
円軌道に沿って移動するようにした現像装置と共にも好
適に使用される。しかしながら、従来回転現像装置が広
く使用されているので、本発明を限定するものではない
が、水明細書では本発明に係る現像装置を回転現像装置
に関連して説明する。The present invention generally relates to a developing device that can be suitably used in a color recording device constituting an output section of a color electrophotographic copying device, a computer, a facsimile, etc., and particularly relates to a developing device that can be used suitably in a color recording device that constitutes an output section of a color electrophotographic copying device, a computer, a facsimile, etc., and particularly in the above-mentioned image forming device. This is a developing device in which a desired developing device is mounted on a conveying device and developed by moving the desired developing device to a position facing a latent image carrier, that is, an object to be developed. ] Prevents developer scattering and color mixing associated with item 2! The present invention relates to a developing device that can be used for printing. The developing device according to the present invention can be used with a rotary developing device in which the conveying device is a rotating body and each developing unit moves along a circular orbit, or the developing device can be used with a rotating body that moves in an endless circulation other than the rotating body. It is also suitable for use with a developing device in which each developer moves along a non-circular trajectory, such as an elliptical trajectory. However, since rotary developing devices have been widely used in the past, the developing device according to the present invention will be described herein in connection with a rotary developing device, although this is not intended to limit the invention.
【１立１Ｊ
従来、カラー電子写真複写装置は、色分解フィルターに
て各色の潜像を形成し、各色の潜像を通常３〜４個の現
像器を用いて個別に現像して現像像を得１次いで該現像
像を順次に同一の転写材に転写することによりカラー画
像を得る方式が一般的である。
斯るカラー画像形成装置の現像装置としては。
被現像体の回りに複数個の現像器を配置した並置式現像
装置、及び典型的には回転体である搬送装置に複数の現
像器を搭載し所望の現像器を現像位置に移動する方式の
回転現像装置が提案されている。最近では、現像装置、
延いてはカラー画像形成装置を小型化できるという理由
から回転現像装置が頻繁に使用されている。
が １ − 、 占しかしながら、
このような利点を有する回転現像装置も新たな問題点と
して、現像器を回転するために、各色の現像器の回転、
停止時のショックで現像器が有する現像スリーブ上の現
像剤がこぼれ落ち、被現像体上の画面を汚して画質を低
下させたり１機内を汚すことがあった。更に重要なこと
には、飛散した現像剤が他の現像器によって捕集され、
現像剤の混色と言う重大な問題が発生してしまう欠点が
ある。
ｌ見立１１
従って、本発明の主たる目的は、上述のような従来の現
像装置が有する欠点を改良し・、複数の現像器を！ｔｌ
、た現像装置の運動、或いは停市によって飛散した現像
剤を捕集回収し、現像剤の混色を防止すると共に、機内
汚れなども防止することのできる現像装置を提供するこ
とである。
ロ るための
上記目的は本発明によって達成される０本発明は要約す
れば、複数の現像器を搬送装置にｇｌｉし該搬送装置を
駆動することによって所望の現像器を現像位置に移送し
そして被現像体の現像を行なう現像装置において、内部
に磁石を有した捕集スリーブを有し、該捕集スリーブ内
の現像器に対向した磁石の磁極は、該現像器に設けられ
且つ被現像体に対向した磁石の磁極と同極とされること
を特徴とする現像装置である。
本発明の好ましい実施態様によると、捕集スリーブ内の
磁石の磁極配置は少なくとも１箇所は隣り合う磁極が同
磁極とされ、又捕集スリーブは一定方向に回転可能とさ
れる。
次に、本発明に係る現像装置について図面を参照して更
に詳しく説明する。
ｔｊＳ１図は本発明を適用するカラー電子写真複写装置
を例示するもので、感光ドラムｌ、−吹寄電器２、像露
光部３、現像部４、転写帯電器５、クリーナー６等を有
し、当業者には周知のプロセスにて感光ドラム１の表面
に潜像が形成され、次いで顕像化され、最後に転写材Ｐ
に現像像が転写される。感光ドラムｌはその後残余現像
像が除去され次のプロセスを開始する。
本実施例にて、現像器Ｍ８は複数の現像器、例えば夫々
イエローＹ、マゼンタＭ、シアンＣ，ブラックＢＫの各
色に着色されたトナー粒子を夫々収容した４個の現像器
８Ｙ、８Ｍ、８Ｃ１８ＢＫを備え、該現像器は１本実施
例では軸０の回りに回転する回転装置である搬送装置８
に支持吊下される。従って、各現像器は回転装置８によ
りターレット型にて回転移動され、選択された一つの現
像器が感光ドラムｌの現像部４に対面せられ、現像作用
を行なう。
各現像器は現像ローラ９を有する任意の構造とし得るが
、−例を挙げれば、現像ローラ９は現像スリーブ９ａと
、該現像スリーブ９ａの内部に配置された固定の磁石９
ｂ、９ｃ、９ｄとから成る。又、現像スリーブ９ａ内の
固定磁石のうち。
感光ドラムｌに対抗する磁石９ｃは本実施例では−Ｎ極
とされ、他の磁石９ｂ、９ｄはＳ極とされる。このとき
、本実施例で現像スリーブ９ａ上の磁束密度は８５０ガ
ウスである。更に、各現像器は、従来の現像器と同様に
トナー補給ボトル１０、現像剤攪拌搬送スクリュー１１
．１２を有する。
上記の構成において、コピー操作の指令で選択された現
像器８Ｙ〜８ＢＫの一つが現像部４に停止し、現像スリ
ーブ９ａが回転して現像作用を行なう、単色指令の場合
はその現像器がそのまま待機して次の現像を行なうが、
二色以上のカラーコピーの場合は選択された他の現像器
が現像部４に移動停止）１する。
本発明に係る現像装置２０は、第１図に例示されるよう
に、感光ドラムｌの上方で且つ回転装置８の回転方向Ｘ
の下流側に、しかも各現像器８Ｙ〜８ＢＫに対向し得る
位置に配置され、現像剤捕集マグネットスリーブ２２と
、回収装置２４とを有する０本実施例において、現像剤
捕集マグネットスリーブ２２は捕集スリーブ２６と、該
捕集スリーブ２６の内部に固定された捕集マグネット２
８とを有し、捕集マグネット２８は、現像器に対向した
磁石２８ａと、反対側に位置した、即ち、１８０″′の
角度をもって配置された磁石２８ｂとから成る。更に、
このスリーブ内の２つの磁石２８ａ、２８ｂはスリーブ
２２の回転とは独立し、回転装置８の回転中心０の方向
に整列するように配置して固定されている。又１本発明
では、磁石２８ａの磁極は、現像器に設けられ且つ被現
像体に対向した磁石９Ｃの磁極と同極とされる。つまり
１本実施例ではＮ極とされる。
好ましい実施例において１回転装置ｉ８と感光ドラム１
間に設置された捕集スリーブ２６は外径的２０φのアル
ミニウム製の円筒体であって、肉厚は０．８ｍｍとされ
、図示していない駆動装置により第１図で矢印Ｙ方向に
回転する。現像スリーブ９ａ、捕集スリーブ２６間の距
離は実施例では約１２ｍｍである。捕集スリーブ２６は
円筒形状である必要はなく 例えば無端ベルト状のもの
を使用することも可能である。
上記構成において、捕集スリーブ２６上の磁力線は第１
図に破線で示すようになる。又、捕集スリーブ２６上の
磁束密度は磁石２８ａの位置では約８００ガウス、磁石
２８ｂの位置では約７００ガウスである。また磁極は両
方ともＮ極とされる。捕集スリーブ２６の表面は捕集さ
れた現像剤の搬送性向上のため表面に非磁性ステンレス
を溶射し表面を荒く処理するのが好ましい。
本発明の好ましい実施態様によると、回収装置２４は、
捕集スリーブ２６上を搬送されてきた現像剤を捕集する
べく該捕集スリーブ２２に押し当てられたスクレーバ２
４ａと、該スクレーバ２４ａにより捕集スリーブ表面か
らはぎ取られた現像剤を図示していない回収箱へと搬送
する搬送ローラ２４ｂとから成る。スクレーバ２４ａは
ポリエチレンテレフタレートの材料で形成され、厚みは
約２００μｍ程度が好適である。スクレーバ２４の捕集
スリーブ２６に対する接触位置はスリーブ２６２上の磁
力線が切れる位置近傍に設定される。
又、またこのスクレーバ２４ａは本実施例では捕集スリ
ーブ２６に押し当てているが、微小間隔をあけて設置し
てもよい。
捕集スリーブ２６上を搬送されてきた現像剤はこの位置
でスクレーバ２４ａによりかき取られ、その下にある搬
送ローラ２４ｂによって図示していない回収箱へと運ば
れ、回収される。搬送ローラ２４ｂはスパイラル状の溝
が付いており、回転によってこの構内にある現像剤を一
定方向に移動回収できる。
上記の如き構成とされる現像剤捕集装置の作動について
説明する。今、現像プロセスを終了した現像器８Ｙが回
転装置の回転により、第２図の如くマグネットスリーブ
２２の位置を通過する場合を考える。この場合、現像ス
リーブ９ａ、捕集スリーブ２６ｎｎの磁力線は対面して
いる磁極が同極性のため、第２図破線のような形状を取
り、磁力線が存在しない部分が生じる（第２図でＡで示
される部分）、このため現像スリーブ９ａ上の現像剤は
捕集スリーブ２６上に移動することなくこの位置を通過
することになる。
一方、現像スリーブ９ａの外に飛散した現像剤は例えば
現像器下部に飛散した現像剤Ｔは第３図に示したごと〈
捕集スリーブ２６によって捕集され、スクレーバー２４
ａ、搬送ローラ２４ｂを通って回収されることになる。
同様に各現像器はこの捕集スリーブ２６前を通過し、飛
散した現像剤の回収が繰り返し行なわれる。
以上説明した本発明の実施例によると、飛散した現像剤
は捕集回収され、良好な捕集効果を示した０本実施例で
は約１万コピーのコピーテストの結果でも現像剤間の混
色は発生しなかった。
第４図は、本発明の他の実施例を示すもので、捕集スリ
ーブ２６の回転方向を前記実施例とは逆の矢印Ｚ方向と
し、捕集スリーブ２６の内部には３個の磁石２８ａ、２
８ｂ、２８ｃが設けられ、磁石２８ａはＮ極とし、他の
磁石はＳ極とされる。又、捕集スリーブ２６の上部にス
クレーバ２４ａを配置、磁石２８ｂ、２８ｃの磁極もこ
の位置で反発極とされ、回収現像剤を図示したごとく自
然落下により回収箱２４ｃに回収する構成とされる。
この実施例では第１図に関連して説明した実施例におけ
る搬送ローラ２４ｂが不要となり、飛散量の少ない、し
たがって回収量も少ない場合などに好適に使用すること
ができ、コスト低減などにとって有効な構成となる。
＆１立羞】
以上説明したように搬送装置に配列された現像器の現像
スリーブ通過位置に、その現像スリーブ内磁石の磁極と
同極性の磁石を対向させた捕集マグネットスリーブを配
置してその位置を通過する各現像器から、現像スリーブ
上の現像剤は捕集せず、現像スリーブ外に飛散した現像
剤のみを捕集し、かつその現像剤を捕集マグネットスリ
ーブ上から回収することによって、カラー画像形成装置
にとって最も重大な現像剤間の混色を防上することが可
能となった。
又、現像スリーブ、捕集マグネットスリーブ間の磁極を
同磁極にすることは、通過時に現像スリーブ上の現像剤
を圧縮する作用も認められ、飛散量ＩＥに貢献している
ことが確かめられた。[1st 1J Conventionally, a color electrophotographic copying apparatus forms a latent image of each color using a color separation filter, and usually develops each color latent image individually using 3 to 4 developing units to obtain a developed image. A common method is to obtain a color image by sequentially transferring the developed images onto the same transfer material. As a developing device of such a color image forming apparatus. A side-by-side type developing device in which a plurality of developing devices are arranged around an object to be developed, and a method in which a plurality of developing devices are mounted on a conveying device, which is typically a rotating body, and a desired developing device is moved to a developing position. Rotary developing devices have been proposed. Recently, developing devices,
Furthermore, rotary developing devices are frequently used because color image forming apparatuses can be made smaller. is 1-, however,
Although the rotary developing device has such advantages, there are new problems such as rotation of the developing device of each color,
Due to the shock when the developing device stopped, the developer on the developing sleeve of the developing device spilled out, staining the screen on the object to be developed, deteriorating the image quality, and contaminating the inside of the machine. More importantly, the scattered developer is collected by other developing devices,
This method has the disadvantage of causing a serious problem of color mixing of the developer. 11 Therefore, the main purpose of the present invention is to improve the above-mentioned drawbacks of the conventional developing device, and to provide a plurality of developing devices! tl
To provide a developing device capable of collecting and recovering developer scattered due to movement or stoppage of the developing device, preventing color mixing of the developer, and preventing staining inside the device. SUMMARY OF THE INVENTION The present invention has the following features: A plurality of developing devices are mounted on a conveying device, a desired developing device is transported to a developing position by driving the conveying device, and A developing device for developing an object to be developed includes a collecting sleeve having a magnet inside, and a magnetic pole of the magnet in the collecting sleeve facing a developing device is provided in the developing device and is connected to the object to be developed. This developing device is characterized in that the magnetic poles are the same as the magnetic poles of the magnets facing the. According to a preferred embodiment of the present invention, the magnetic poles of the magnets in the collection sleeve are such that adjacent magnetic poles have the same magnetic pole in at least one location, and the collection sleeve is rotatable in a fixed direction. Next, the developing device according to the present invention will be described in more detail with reference to the drawings. Figure tjS1 illustrates a color electrophotographic copying apparatus to which the present invention is applied, which includes a photosensitive drum 1, a blower charger 2, an image exposure section 3, a developing section 4, a transfer charger 5, a cleaner 6, etc. A latent image is formed on the surface of the photosensitive drum 1 by a process well known to those skilled in the art, then developed, and finally transferred to the transfer material P.
The developed image is transferred to. The remaining developed image is then removed from the photosensitive drum 1, and the next process begins. In this embodiment, the developing device M8 includes a plurality of developing devices, for example, four developing devices 8Y, 8M, and 8C18BK each containing toner particles colored in yellow Y, magenta M, cyan C, and black BK. In this embodiment, the developing device includes a conveying device 8 which is a rotating device that rotates around an axis 0.
It is supported and suspended. Therefore, each developing device is rotated in a turret shape by the rotating device 8, and one selected developing device is brought to face the developing section 4 of the photosensitive drum 1 and performs a developing action. Each developer device may be of any construction having a developer roller 9; for example, the developer roller 9 includes a developer sleeve 9a and a fixed magnet 9 disposed inside the developer sleeve 9a.
It consists of b, 9c, and 9d. Also, among the fixed magnets inside the developing sleeve 9a. In this embodiment, the magnet 9c facing the photosensitive drum 1 has a -N pole, and the other magnets 9b and 9d have S poles. At this time, in this embodiment, the magnetic flux density on the developing sleeve 9a is 850 Gauss. Furthermore, each developing device is equipped with a toner supply bottle 10 and a developer stirring and conveying screw 11, as in the conventional developing device.
．． It has 12. In the above configuration, one of the developing devices 8Y to 8BK selected by the copy operation command stops at the developing section 4, and the developing sleeve 9a rotates to perform the developing action.In the case of a monochrome command, the developing device remains unchanged. I wait and do the next development, but
In the case of a color copy of two or more colors, the other selected developing device moves to the developing section 4 and stops)1. As illustrated in FIG. 1, the developing device 20 according to the present invention is located above the photosensitive drum l and in the rotation direction
In this embodiment, the developer collecting magnetic sleeve 22 is disposed on the downstream side of the developing device 8 and at a position facing each of the developing units 8Y to 8BK, and has a developer collecting magnetic sleeve 22 and a recovery device 24. A collection sleeve 26 and a collection magnet 2 fixed inside the collection sleeve 26
8, and the collecting magnet 28 is composed of a magnet 28a facing the developing device and a magnet 28b located on the opposite side, that is, arranged at an angle of 180''.Furthermore,
The two magnets 28a and 28b within this sleeve are independent of the rotation of the sleeve 22, and are arranged and fixed in alignment in the direction of the rotation center 0 of the rotation device 8. Further, in the present invention, the magnetic pole of the magnet 28a is made to be the same as the magnetic pole of the magnet 9C provided in the developing device and facing the object to be developed. In other words, in this embodiment, it is set as the north pole. In a preferred embodiment, one rotating device i8 and a photosensitive drum 1
The collection sleeve 26 installed between them is an aluminum cylinder with an outer diameter of 20φ and a wall thickness of 0.8 mm, and is rotated in the direction of arrow Y in FIG. 1 by a drive device (not shown). . The distance between the developing sleeve 9a and the collection sleeve 26 is approximately 12 mm in the embodiment. The collection sleeve 26 does not have to be cylindrical, and may be shaped like an endless belt, for example. In the above configuration, the lines of magnetic force on the collection sleeve 26 are the first
The result will be as shown by the broken line in the figure. Further, the magnetic flux density on the collection sleeve 26 is approximately 800 Gauss at the position of the magnet 28a, and approximately 700 Gauss at the position of the magnet 28b. Further, both magnetic poles are N poles. The surface of the collection sleeve 26 is preferably roughened by thermally spraying non-magnetic stainless steel to improve the transportability of the collected developer. According to a preferred embodiment of the invention, the collection device 24 includes:
A scraper 2 is pressed against the collecting sleeve 22 to collect the developer conveyed on the collecting sleeve 26.
4a, and a conveying roller 24b that conveys the developer stripped off from the surface of the collecting sleeve by the scraper 24a to a collection box (not shown). The scraper 24a is made of polyethylene terephthalate material, and preferably has a thickness of about 200 μm. The contact position of the scraper 24 with respect to the collecting sleeve 26 is set near the position where the lines of magnetic force on the sleeve 262 are cut. Further, although the scraper 24a is pressed against the collection sleeve 26 in this embodiment, it may be installed with a slight interval therebetween. The developer conveyed on the collection sleeve 26 is scraped off by the scraper 24a at this position, and conveyed to a collection box (not shown) by the conveyance roller 24b located below, where it is collected. The conveyance roller 24b has a spiral groove, and by rotation, the developer within the conveyance roller 24b can be moved and collected in a certain direction. The operation of the developer collecting device configured as described above will be explained. Now, let us consider a case where the developing device 8Y, which has completed the developing process, passes through the position of the magnetic sleeve 22 as shown in FIG. 2 due to the rotation of the rotating device. In this case, the lines of magnetic force in the developing sleeve 9a and the collecting sleeve 26nn have the same polarity as the magnetic poles facing each other, so they take a shape like the broken line in Figure 2, and there are parts where there are no lines of magnetic force (A in Figure 2). Therefore, the developer on the developing sleeve 9a passes through this position without moving onto the collecting sleeve 26. On the other hand, the developer scattered outside the developing sleeve 9a is, for example, the developer T scattered at the lower part of the developing device, as shown in FIG.
Collected by the collection sleeve 26 and scraped by the scraper 24
a, it passes through the conveyance roller 24b and is collected. Similarly, each developing device passes in front of the collection sleeve 26, and the scattered developer is repeatedly collected. According to the embodiment of the present invention described above, the scattered developer is collected and recovered, showing a good collection effect. In this embodiment, even as a result of a copy test of about 10,000 copies, color mixing between the developers was not observed. It did not occur. FIG. 4 shows another embodiment of the present invention, in which the rotation direction of the collection sleeve 26 is in the direction of arrow Z, which is opposite to that of the previous embodiment, and the collection sleeve 26 has three magnets 28a inside. ,2
8b and 28c are provided, with the magnet 28a being the north pole and the other magnets being the south pole. Further, a scraper 24a is disposed above the collection sleeve 26, and the magnetic poles of the magnets 28b and 28c are also used as repelling poles at this position, so that the collected developer is collected into the collection box 24c by gravity as shown. This embodiment eliminates the need for the conveyance roller 24b in the embodiment described in connection with FIG. 1, and can be suitably used in cases where the amount of scattering is small, and therefore the amount of collection is also small, and is effective for cost reduction. It becomes the composition. &1 Stand] As explained above, a collection magnet sleeve in which a magnet with the same polarity as the magnet in the developing sleeve is placed opposite the developing sleeve passing position of the developing devices arranged in the conveying device is placed and the position is adjusted. By collecting only the developer scattered outside the developing sleeve without collecting the developer on the developing sleeve from each developing device passing through the developing device, and collecting the developer from the collecting magnetic sleeve, It has become possible to prevent color mixing between developers, which is the most important problem for color image forming apparatuses. In addition, it was confirmed that making the magnetic poles between the developing sleeve and the collection magnet sleeve the same has the effect of compressing the developer on the developing sleeve during passage, contributing to the amount of scattering IE.
第１図は１本発明に係る現像装置と、該現像装置を適用
し得るカラー複写装置の主要な構成部分を説明した縦断
面図である。
第２図は、現像スリーブが現像剤捕集装置を通過する時
の様子を説明した縦断面図である。
第３図は、現像スリーブ外に飛散した現像剤を捕集する
時の情況を説明した縦断面図である。
第４図は、本発明に係る現像？Ｃ置の他の実施例を示す
縦断面図である。
ｌ：被現像体（感光ドラム）
８：回転装置
９：現像ローラ
９ａ：現像スリーブ
９ｂ、９ｃ、９ｄ：磁石
２０：現像剤捕集装置
２２：捕集マグネットスリーブ
２４：回収装置
２４ａ：スクレーバ
２６：捕集スリーブ
２８ａ、２８ｂ、２８ｃ：磁石FIG. 1 is a longitudinal cross-sectional view illustrating the main components of a developing device according to the present invention and a color copying apparatus to which the developing device can be applied. FIG. 2 is a longitudinal cross-sectional view illustrating how the developing sleeve passes through the developer collecting device. FIG. 3 is a longitudinal sectional view illustrating the situation when the developer scattered outside the developing sleeve is collected. FIG. 4 shows the development according to the present invention? It is a longitudinal cross-sectional view which shows another Example of C position. l: Developed object (photosensitive drum) 8: Rotating device 9: Developing roller 9a: Developing sleeves 9b, 9c, 9d: Magnet 20: Developer collecting device 22: Collection magnet sleeve 24: Collection device 24a: Scraper 26: Collection sleeves 28a, 28b, 28c: magnets
Claims (1)
することによつて所望の現像器を現像位置に移送しそし
て被現像体の現像を行なう現像装置において、内部に磁
石を有した捕集スリーブを有し、該捕集スリーブ内の現
像器に対向した磁石の磁極は、該現像器に設けられ且つ
被現像体に対向した磁石の磁極と同極とされることを特
徴とする現像装置。 ２）捕集スリーブ内の磁石の磁極配置は少なくとも１箇
所は隣り合う磁極が同磁極である特許請求の範囲第１項
記載の現像装置。 ３）捕集スリーブは一定方向に回転可能である特許請求
の範囲第１項又は第２項記載現像装置。 ４）捕集スリーブ上に捕集された現像剤を回収するため
の回収装置が設けられて成る特許請求の範囲第３項記載
の現像装置。 ５）回収装置は捕集スリーブの表面に接触又は近接して
設けられたスクレーバを有して成る特許請求の範囲第４
項記載の現像装置。 ６）スクレーバは捕集スリーブ上の磁力線が切れる位置
に配置されて成る特許請求の範囲第５項記載の現像装置
。[Scope of Claims] 1) A developing device in which a plurality of developing devices are mounted on a conveying device, and by driving the conveying device, a desired developing device is transferred to a developing position and develops an object to be developed, The collecting sleeve has a magnet therein, and the magnetic pole of the magnet in the collecting sleeve facing the developing device is the same as the magnetic pole of the magnet provided in the developing device and facing the object to be developed. A developing device characterized by: 2) The developing device according to claim 1, wherein the magnetic poles of the magnets in the collection sleeve are arranged so that adjacent magnetic poles are the same in at least one location. 3) The developing device according to claim 1 or 2, wherein the collecting sleeve is rotatable in a fixed direction. 4) The developing device according to claim 3, further comprising a collecting device for collecting the developer collected on the collecting sleeve. 5) Claim 4, wherein the collection device comprises a scraper provided in contact with or close to the surface of the collection sleeve.
Developing device described in Section 1. 6) The developing device according to claim 5, wherein the scraper is arranged at a position where the lines of magnetic force on the collecting sleeve are cut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60069978A JPH0731436B2 (en) | 1985-04-04 | 1985-04-04 | Development device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60069978A JPH0731436B2 (en) | 1985-04-04 | 1985-04-04 | Development device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61230178A true JPS61230178A (en) | 1986-10-14 |
| JPH0731436B2 JPH0731436B2 (en) | 1995-04-10 |
Family
ID=13418254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60069978A Expired - Fee Related JPH0731436B2 (en) | 1985-04-04 | 1985-04-04 | Development device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0731436B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62192778A (en) * | 1986-02-20 | 1987-08-24 | Canon Inc | Image forming device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5099149A (en) * | 1973-12-28 | 1975-08-06 | ||
| JPS5473646A (en) * | 1977-11-25 | 1979-06-13 | Ricoh Co Ltd | Magnetic brush developing device |
| JPS58128447U (en) * | 1982-02-22 | 1983-08-31 | 日本電気ホームエレクトロニクス株式会社 | Color developing device |
| JPS59166253U (en) * | 1983-04-22 | 1984-11-07 | 株式会社リコー | Transfer paper grip device |
-
1985
- 1985-04-04 JP JP60069978A patent/JPH0731436B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5099149A (en) * | 1973-12-28 | 1975-08-06 | ||
| JPS5473646A (en) * | 1977-11-25 | 1979-06-13 | Ricoh Co Ltd | Magnetic brush developing device |
| JPS58128447U (en) * | 1982-02-22 | 1983-08-31 | 日本電気ホームエレクトロニクス株式会社 | Color developing device |
| JPS59166253U (en) * | 1983-04-22 | 1984-11-07 | 株式会社リコー | Transfer paper grip device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62192778A (en) * | 1986-02-20 | 1987-08-24 | Canon Inc | Image forming device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0731436B2 (en) | 1995-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |