JPH07185389A - Nonmagnetic powder removing device - Google Patents
Nonmagnetic powder removing deviceInfo
- Publication number
- JPH07185389A JPH07185389A JP5334359A JP33435993A JPH07185389A JP H07185389 A JPH07185389 A JP H07185389A JP 5334359 A JP5334359 A JP 5334359A JP 33435993 A JP33435993 A JP 33435993A JP H07185389 A JPH07185389 A JP H07185389A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- toner
- magnetic toner
- magnetic force
- powder
- 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.)
- Withdrawn
Links
Landscapes
- Cleaning In Electrography (AREA)
- Electrostatic Separation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は磁性粉体と非磁性粉体の
混在物から非磁性粉体を除去する除去装置に関し、特に
電子写真技術を用いた複写機やプリンタ等に用いられる
除去装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a removing device for removing non-magnetic powder from a mixture of magnetic powder and non-magnetic powder, and more particularly to a removing device used in copying machines and printers using electrophotographic technology. Regarding
【０００２】[0002]
【従来の技術】電子写真技術を用いた画像形成装置にお
いて、感光体上に形成された静電潜像を磁性トナーで現
像し、現像された画像を記録材上に転写する場合に、転
写されなかった磁性トナーは感光体上に残留する。現在
は、クリーニング手段によってこの転写のこり磁性トナ
ーを回収し、処理しているが、最近、この転写のこり磁
性トナーを再び現像に供することが提案されている。2. Description of the Related Art In an image forming apparatus using electrophotography, when an electrostatic latent image formed on a photoconductor is developed with magnetic toner and the developed image is transferred onto a recording material, it is transferred. The missing magnetic toner remains on the photoreceptor. At present, this transfer dust magnetic toner is collected and processed by a cleaning means, but recently, it has been proposed to use this transfer dust magnetic toner again for development.
【０００３】[0003]
【発明が解決しようとしている課題】しかし、回収され
た磁性トナー中には、紙粉、埃、その他外部からの異物
等が混入している。また、磁性トナー中に添加している
潤滑剤、研磨剤、帯電制御剤等の外添剤は記録剤に転写
されないため、回収された磁性トナー中に含まれるこれ
らの粉体の割合は、もともとの磁性トナー中のその割合
に比べて非常に多くなっている。従って、回収された磁
性トナーをそのまま現像に使用すると、もともとの磁性
トナーで現像された画像より薄くなったり、画像上の欠
陥が生じたりするため、回収された磁性トナー中からこ
れらの夾雑物を取り除くことが必要となる。However, the collected magnetic toner contains paper dust, dust, and other foreign substances from the outside. In addition, since external additives such as lubricants, abrasives and charge control agents added to the magnetic toner are not transferred to the recording agent, the ratio of these powders contained in the recovered magnetic toner is originally The ratio is much higher than that in the magnetic toner. Therefore, if the collected magnetic toner is used for the development as it is, it becomes thinner than the image originally developed with the magnetic toner, or a defect occurs in the image, and therefore these contaminants are removed from the collected magnetic toner. It will need to be removed.
【０００４】これまで提案された技術では、回収した磁
性トナーをフィルターに通す方法、磁力によって分離す
る方法、等が提案されてきたが、磁性トナーをフィルタ
ーに通過させること自体がむずかしく、フィルターは目
的の粒径以下の物ならば通過してしまう欠点を有し、ま
た、フィルターの目が詰まるため、それをふるい落とす
手段が必要で、当然定期的にフィルタを交換しなければ
ならない不都合を有している。また、磁力を利用する方
法では回収した磁性トナー中に混入している夾雑物が磁
性トナー中に完全に混ざっているため分離が十分できな
いという問題があった。In the technologies proposed so far, a method of passing the collected magnetic toner through a filter, a method of separating the magnetic toner by magnetic force, etc. have been proposed. However, it is difficult to pass the magnetic toner through the filter, and the filter is intended. If the particle size is less than the specified size, it will pass through, and since the filter will be clogged, it will be necessary to have a means of sieving it off, and of course the filter will need to be replaced regularly. ing. Further, the method utilizing magnetic force has a problem that the contaminants mixed in the collected magnetic toner are completely mixed in the magnetic toner, so that the separation cannot be sufficiently performed.
【０００５】[0005]
【課題を解決するための手段】そこで上述した課題を解
決する本発明は、磁性粉体と非磁性粉体の混在物から非
磁性粉体を除去する非磁性粉体除去装置であって、粉体
搬送路と、この粉体搬送路に磁界を形成する手段と、磁
性粉体が搬送路内を移動するように磁界を変化させる手
段と、を有し、磁性粉体が搬送路内を移動している時に
磁力以外の外力を作用させて非磁性粉体を除去すること
を特徴とする。The present invention, which solves the above-mentioned problems, is a non-magnetic powder removing apparatus for removing non-magnetic powder from a mixture of magnetic powder and non-magnetic powder. The magnetic powder moves in the transfer path, having a body transfer path, means for forming a magnetic field in the powder transfer path, and means for changing the magnetic field so that the magnetic powder moves in the transfer path. The non-magnetic powder is removed by applying an external force other than the magnetic force during the operation.
【０００６】[0006]
第１実施例 次に本発明の第１実施例を示す。また、図２に本発明の
除去装置を用いた画像形成装置の概略構成図を示す。こ
の画像形成装置は、矢印Ａ方向に回転する感光体ドラム
８表面を帯電器１０によって一様に帯電し、画像情報に
基づいた光ｌで帯電領域を露光する。その後現像器９中
の磁性トナーを感光体ドラム８に供給することで感光体
ドラム８表面にトナー像を形成する。このトナー像は転
写帯電器１１によって記録材Ｐ上に転写され、トナー像
を転写された記録材Ｐは分離帯電器１２によって感光体
ドラム８から剥離される。この後記録材Ｐは定着器４０
に搬送され、トナー像は記録材Ｐに定着される。転写工
程後、感光体ドラム８に残った残留トナーや感光体ドラ
ムに付着した紙粉等はクリーニング器１３によってドラ
ム上から除去される。感光体から除去された異物を含む
回収トナーは、本発明の除去装置を有する搬送手段５０
によって再び現像器９内に送られて再利用されるもので
ある。First Embodiment Next, a first embodiment of the present invention will be shown. Further, FIG. 2 shows a schematic configuration diagram of an image forming apparatus using the removing apparatus of the present invention. In this image forming apparatus, the surface of the photosensitive drum 8 rotating in the direction of arrow A is uniformly charged by a charger 10, and the charging area is exposed with light 1 based on image information. Then, the magnetic toner in the developing device 9 is supplied to the photosensitive drum 8 to form a toner image on the surface of the photosensitive drum 8. This toner image is transferred onto the recording material P by the transfer charger 11, and the recording material P onto which the toner image has been transferred is separated from the photosensitive drum 8 by the separation charger 12. After this, the recording material P is fixed to the fixing device 40.
And the toner image is fixed on the recording material P. After the transfer step, the residual toner remaining on the photoconductor drum 8 and the paper dust and the like adhering to the photoconductor drum 8 are removed from the drum by the cleaning device 13. The collected toner containing the foreign matter removed from the photoconductor is conveyed by the conveying means 50 having the removing device of the present invention.
Is sent again to the developing device 9 for reuse.
【０００７】図１（ａ）、図１（ｂ）、図１（ｃ）に第
１実施例を示す。図２のクリーニング部で回収された磁
性トナーは磁性トナー搬送管３中を夾雑物分離手段（非
磁性粉体除去手段）に搬送される。搬送の手段としては
何でもよく螺旋状の部材を回転させる方法、超音波振動
による搬送方法、また、本発明における磁力発生手段に
よる搬送をクリーニング部から直接行っても良い。A first embodiment is shown in FIGS. 1 (a), 1 (b) and 1 (c). The magnetic toner collected by the cleaning unit in FIG. 2 is conveyed through the magnetic toner conveying pipe 3 to the contaminant separating means (non-magnetic powder removing means). Any means may be used as a carrying means, such as a method of rotating a spiral member, a carrying method by ultrasonic vibration, or carrying by the magnetic force generating means of the present invention may be carried out directly from the cleaning section.
【０００８】夾雑物分離手段は搬送管３と、搬送管の外
側上部に配されたベルト状の磁力発生手段１、搬送管下
部に配された夾雑物回収手段４からなる。The foreign matter separating means comprises a carrying pipe 3, a belt-shaped magnetic force generating means 1 arranged on the upper outside of the carrying pipe, and a foreign matter collecting means 4 arranged under the carrying pipe.
【０００９】搬送管３は半円筒状で上部は平面、下部は
円筒状になっていて、下部には落ちてきた夾雑物を排出
できるように開口が設けられている。搬送管内面上部は
磁性トナーが回転し易いように粗面を形成している。も
ちろん搬送管の形状は磁性トナーの搬送と夾雑物の分離
が行えるならば何でもよく、例えば、円筒状、角柱状で
も良い。The transfer tube 3 is semi-cylindrical, has an upper surface that is flat and a lower portion that is cylindrical, and has an opening formed in the lower portion so that the foreign substances that fall can be discharged. A rough surface is formed on the upper portion of the inner surface of the transport tube so that the magnetic toner can easily rotate. Of course, the shape of the transfer tube may be any shape as long as it can transfer the magnetic toner and separate the contaminants, for example, a cylindrical shape or a prismatic shape.
【００１０】磁力発生手段１はフェライトを混入したゴ
ムをベルト状にして両端をつなぎ、プーリー２によって
支えて無限軌道を形成している。磁力発生手段１の構成
は搬送管の外部から磁性トナーを引きつけるに十分な磁
力を保持でき、搬送管３に隣接する部分が矢印Ｂ方向に
移動することによって磁性トナーを図１（ｃ）の矢印Ｄ
のように回転させる構造にできる物ならば何でも良い。
プーリーを図示しない駆動装置によって回転することで
磁力発生手段１を駆動することができる。本実施例にお
いては磁力発生手段を１５０ｍｍ／ｓｅｃの速度で移動
させている。磁力発生手段１の表面には図１（ｂ）に示
すように搬送管の搬送方向に２．５ｍｍ間隔でＮ極７
ａ、Ｓ極７ｂが交互になるように磁極を形成させてい
る。それぞれの磁極の形状は長方形でも半円状でもよく
磁性トナーの搬送形状によって変化し得る。また、ベル
トの繋ぎ目も磁極がずれないように配している。The magnetic force generating means 1 is made of rubber mixed with ferrite in the form of a belt, connected at both ends, and supported by a pulley 2 to form an endless track. The magnetic force generating means 1 can maintain a magnetic force sufficient to attract the magnetic toner from the outside of the conveying tube, and the portion adjacent to the conveying tube 3 moves in the direction of arrow B to move the magnetic toner to the arrow in FIG. 1C. D
Anything can be used as long as it can be rotated.
The magnetic force generating means 1 can be driven by rotating the pulley by a driving device (not shown). In this embodiment, the magnetic force generating means is moved at a speed of 150 mm / sec. On the surface of the magnetic force generating means 1, as shown in FIG. 1B, N poles 7 are arranged at 2.5 mm intervals in the transport direction of the transport tube.
The magnetic poles are formed so that the a and S poles 7b alternate. The shape of each magnetic pole may be rectangular or semicircular, and may change depending on the shape of the magnetic toner conveyed. Also, the belt joints are arranged so that the magnetic poles do not shift.
【００１１】夾雑物回収部材４は搬送管の開口部に回収
された夾雑物６が外部に漏れないように密閉している。
また、夾雑物回収部材４は取り外しが容易になっており
回収された夾雑物６を適宜排出することができる。The foreign matter collecting member 4 is hermetically sealed so that the foreign matter 6 collected in the opening of the conveying pipe does not leak to the outside.
Further, the foreign matter collecting member 4 is easily removed, and the collected foreign matter 6 can be appropriately discharged.
【００１２】図１（ｃ）に示すように夾雑物分離手段に
運ばれた夾雑物を含む磁性トナー５は、搬送管３の外側
に配された磁力発生手段１の磁力によって搬送管３の内
側の壁、特に磁力発生手段に対向している平面部分に張
り付く。そのとき、磁性トナー５は磁力発生手段１の磁
力によって磁化し、一部の物はその磁力によって磁性ト
ナー同士が引きつけあい穂を形成する。磁力発生手段１
を磁性トナー搬送管の搬送方向の逆の方向（矢印Ｂ方
向）に動くように駆動すると、磁性トナー５にとっては
トナー搬送方向下流側からＮＳ極が交互に向かってくる
様にみえる。磁化した磁性トナー自身に発生したＮＳ極
のため磁性トナーは磁力発生手段１のＮＳ極の動きに合
わせて回転を始める（矢印Ｄ）。この回転のため磁性ト
ナーは搬送方向に転がってゆく。個々の磁性トナーがそ
れぞれに回転するため磁性トナーはほぐれ磁性トナー中
に混ざっていた非磁性の夾雑物６は磁性トナーから遊離
し、自らの重量によって搬送管下部へ落下し、夾雑物回
収部材４に回収される。As shown in FIG. 1 (c), the magnetic toner 5 containing the contaminants conveyed to the contaminant separating means is inside the conveying tube 3 by the magnetic force of the magnetic force generating means 1 arranged outside the conveying tube 3. Cling to the wall, especially to the flat part facing the magnetic force generating means. At that time, the magnetic toner 5 is magnetized by the magnetic force of the magnetic force generation means 1, and the magnetic toner attracts some of the objects by the magnetic force to form a pair of ears. Magnetic force generating means 1
Is driven so as to move in the direction opposite to the transport direction of the magnetic toner transport tube (the direction of arrow B), it appears to the magnetic toner 5 that the NS poles alternately come from the downstream side in the toner transport direction. Due to the NS pole generated in the magnetized magnetic toner itself, the magnetic toner starts rotating in accordance with the movement of the NS pole of the magnetic force generating means 1 (arrow D). Due to this rotation, the magnetic toner rolls in the carrying direction. Since each magnetic toner rotates independently, the magnetic toner is loosened, and the non-magnetic impurities 6 mixed in the magnetic toner are released from the magnetic toner and fall to the lower part of the conveying tube due to their own weight, and the impurities collecting member 4 Will be collected.
【００１３】上記の方法によって夾雑物が分離された磁
性トナー５は現像部材に供給され現像に使用される。The magnetic toner 5 from which impurities have been separated by the above method is supplied to the developing member and used for development.
【００１４】図２に示されるような本発明を利用した構
造の複写機によって通紙実験を行った。A paper passing experiment was conducted by a copying machine having a structure utilizing the present invention as shown in FIG.
【００１５】本発明を利用せずに、従来提案されていた
トナー再利用装置を用いた複写機においては１万枚頃か
ら濃度が低下し始め５万枚で反射濃度が規格を割った。
これは、磁性トナーに異物が混じっているため帯電量が
初期１０μＣ／ｇから５万枚時点で６μＣ／ｇまで落ち
ていたからである。また、２万枚頃から画像に白い縦筋
が現れ始め、５万枚時点では完全に縦に画像が抜けてし
まった。このとき、現像器の現像シリンダ上の磁性トナ
ーの厚みを規制する部材と現像シリンダの間に紙粉と思
われる異物が所々に詰まっていた。In the copying machine using the toner recycling device proposed hitherto without using the present invention, the density starts to drop from about 10,000 sheets and the reflection density falls below the standard at 50,000 sheets.
This is because the amount of charge dropped from 10 μC / g at the initial stage to 6 μC / g at the time of 50,000 sheets because foreign matter was mixed in the magnetic toner. In addition, white vertical stripes began to appear in the image from about 20,000 sheets, and the image completely disappeared vertically at the time of 50,000 sheets. At this time, foreign matter, which is considered to be paper dust, was clogged in some places between the developing cylinder and the member that regulates the thickness of the magnetic toner on the developing cylinder of the developing device.
【００１６】本発明を使用した複写機においては１０万
枚まで良好な複写が行え、濃度の低下、縦筋はみられな
かった。磁性トナーの帯電量も１０万枚時点でも９μＣ
／ｇを保ち、厚み規制部材と現像シリンダの間にも詰ま
りは認められなかった。In the copying machine using the present invention, good copying was possible up to 100,000 sheets, and there was no decrease in density and no vertical streaks. The magnetic toner charge amount is 9 μC even at the time of 100,000 sheets.
/ G was maintained, and no clogging was observed between the thickness regulating member and the developing cylinder.
【００１７】第２実施例 図３、図４、図５に本発明の第２実施例を示す。第２実
施例の除去装置では、図３に示すように表面にＮ極とＳ
極が交互に螺旋状に形成されている円筒状の磁石１４を
使用する。この磁石１４は回転可能になっており、駆動
装置１６によって回転させることができる。Second Embodiment FIGS. 3, 4, and 5 show a second embodiment of the present invention. In the removing device of the second embodiment, as shown in FIG.
A cylindrical magnet 14 with alternating poles is used. The magnet 14 is rotatable and can be rotated by the driving device 16.
【００１８】この磁石１４の外側を非磁性のスリーブ１
５で覆い、回収トナー５をトナー搬入口２２からスリー
ブ外表面に接触させ（矢印方向から入れる）、シリンダ
内部の磁石１４を回転させた。A non-magnetic sleeve 1 is provided outside the magnet 14.
5, the collected toner 5 was brought into contact with the outer surface of the sleeve from the toner carrying-in port 22 (inserted from the direction of the arrow), and the magnet 14 inside the cylinder was rotated.
【００１９】磁性トナー５は磁石の磁力によってスリー
ブ１５外表面に吸着する。磁石の回転によって第１実施
例と同様にトナー自身が回転を始めスリーブ表面を動
く。即ち、矢印Ｈ方向に磁石１４を回転させると磁性ト
ナーは矢印Ｅのうように磁石１４の回転方向と逆方向に
回転しながら矢印Ｉ方向に移動する。磁石表面は螺旋状
に磁化しているため磁性トナーは磁化した線の垂直方向
Ｅに向けて回転しながら矢印Ｉの方向に搬送される。符
号２１が磁性トナーの移動経路である。The magnetic toner 5 is attracted to the outer surface of the sleeve 15 by the magnetic force of the magnet. The rotation of the magnet causes the toner itself to start rotating and move on the sleeve surface as in the first embodiment. That is, when the magnet 14 is rotated in the direction of arrow H, the magnetic toner moves in the direction of arrow I while rotating in the direction opposite to the direction of rotation of the magnet 14 as indicated by arrow E. Since the magnet surface is spirally magnetized, the magnetic toner is conveyed in the direction of arrow I while rotating in the direction E perpendicular to the magnetized line. Reference numeral 21 is a moving path of the magnetic toner.
【００２０】スリーブ１５の外側にはトナー５の飛散を
防ぐためアクリルの円管１７をスリーブ表面から適当な
間隔をおいて配している。An acrylic circular tube 17 is arranged outside the sleeve 15 at an appropriate distance from the sleeve surface in order to prevent the toner 5 from scattering.
【００２１】アクリル管１７は一部あけておき、搬送管
の側面に送風用のファン１８を配し、搬送スリーブ１５
上で搬送中の磁性トナー５に風を吹き付ける。風の強さ
は、風によって搬送中の磁性トナーが吹き飛ばされない
程度で強くする。もちろん、磁力発生手段１４の磁力を
強くすることで風の強さを強くすることができる。風の
強さ、磁力発生手段の磁力、磁性トナー中の磁性物質の
混入量、材質は磁性トナー中に混入した夾雑物の分離の
難度によって決定される。搬送管のファン１８がない側
面には吹き飛ばされた夾雑物６を回収する夾雑物回収部
材４を配した。夾雑物回収部材４には夾雑物を含む風を
フィルター１９を通して外部に排出するよう配しており
夾雑物を効果的に回収する。このフィルター１９は空気
と夾雑物６のみを分離するため、従来の磁性トナー５中
の夾雑物６を分離するフィルター１９より磁性トナー５
を通過させない分簡単な構造でより長持ちする。フィル
ター１９によって分離された夾雑物６は集められ排出さ
れる。風は図４中のＣの方向に流れる。A portion of the acrylic pipe 17 is left open, a fan 18 for blowing air is arranged on the side surface of the carrying pipe, and the carrying sleeve 15 is provided.
The air is blown onto the magnetic toner 5 being conveyed. The strength of the wind is increased to the extent that the magnetic toner being conveyed is not blown off by the wind. Of course, the strength of the wind can be increased by increasing the magnetic force of the magnetic force generation means 14. The strength of the wind, the magnetic force of the magnetic force generating means, the amount of the magnetic substance mixed in the magnetic toner, and the material are determined by the degree of difficulty in separating the foreign substances mixed in the magnetic toner. A foreign matter collecting member 4 for collecting the blown foreign matter 6 is arranged on the side surface of the transfer tube where the fan 18 is not provided. The foreign matter collecting member 4 is arranged so that the air containing the foreign matter is discharged to the outside through the filter 19 to effectively collect the foreign matter. Since this filter 19 separates only the air and the foreign matter 6, the magnetic toner 5 is separated from the conventional filter 19 for separating the foreign matter 6 in the magnetic toner 5.
Since it does not pass through, it has a simple structure and lasts longer. The contaminants 6 separated by the filter 19 are collected and discharged. The wind flows in the direction of C in FIG.
【００２２】もちろん本実施例を、第１実施例と併せて
実施することが可能でより夾雑物の分離に効果が期待さ
れる。Of course, this embodiment can be carried out in combination with the first embodiment, and the effect of separating foreign matters is expected.
【００２３】本実施例においても複写機に投入して１０
万枚の通紙実験を行ったところ、濃度の低下、画像の欠
陥は起こらなかった。また１０万枚複写後の磁性トナー
の帯電量は９μＣ／ｇで第１実施例と同等であった。Also in this embodiment, 10 times after being loaded into the copying machine.
As a result of carrying out a paper-passing test on 10,000 sheets, no decrease in density and no image defect occurred. Further, the charge amount of the magnetic toner after copying 100,000 sheets was 9 μC / g, which was equivalent to that in the first embodiment.
【００２４】第３実施例 図６、図７に本発明の第３実施例を示す。本実施例にお
いては磁力発生手段１の構造はほぼ第１実施例と同等な
ので詳細は略す。Third Embodiment FIGS. 6 and 7 show a third embodiment of the present invention. In this embodiment, the structure of the magnetic force generating means 1 is almost the same as that of the first embodiment, and therefore its details are omitted.
【００２５】本実施例においては図示しないクリーニン
グ手段において回収された磁性トナー５を開口２２から
搬送板５０上に送って、磁力発生手段１によって搬送し
ながらコロトロン２５による帯電を行い、回収された磁
性トナーを一様にプラスに帯電させる。搬送板３０の下
部には第１実施例と同様の磁力発生手段１を配してい
る。開口２２から搬送板３０上に導かれた回収物は磁力
発生手段１によって搬送板３０上を搬送される。そして
搬送方向下流に非磁性の導電物質によって構成された平
行電極２７、２８が配されており、下部電極２８にプラ
ス、上部電極２７にマイナス電位を印加することで、プ
ラスに帯電した物質が電極間を通過する際にマイナス側
の電極２７に引きつけられる。この時、磁力発生手段１
によって磁性物を引きつける力は、電極２７、２８によ
って帯電物を電極に引きつける力よりも大きくなるよう
に設定されている。よって電極２７、２８の間に搬送さ
れた回収物５、６のうち、非磁性の異物６はマイナス電
極２７に引きつけられるが、磁性トナー５はプラスに帯
電していても搬送板３０上に引きつけられたままとなっ
ており、搬送板３０上を更に下流に回転しながら移動し
ていく。このようにして磁性物と非磁性物との分離を行
う。もちろんここでも電極間に印加する電圧、磁力発生
手段の磁力、磁性トナー中に添加される外添材の量と材
質、磁性トナーを帯電する帯電量は磁性トナー中に含ま
れる夾雑物の分離の難度によって決定される。本実施例
においては回収された磁性トナーを帯電させている。即
ち、トナーに最初から添加している外添剤の粒径は磁性
トナーよりはるかに小さいため、外添剤の重量あたりの
帯電量は磁性トナーより大きくなり、電極に引きつけら
れやすくなることで、磁性トナーと外添剤の分離効果も
大きくなる。もちろん、本実施例も第１、第２実施例と
併用が可能でより夾雑物の分離に効果がある。In the present embodiment, the magnetic toner 5 collected by the cleaning means (not shown) is sent from the opening 22 onto the carrying plate 50, and is charged by the corotron 25 while being carried by the magnetic force generating means 1 to collect the collected magnetic properties. The toner is uniformly positively charged. The magnetic force generating means 1 similar to that of the first embodiment is arranged below the carrier plate 30. The collected matter guided from the opening 22 onto the transport plate 30 is transported on the transport plate 30 by the magnetic force generating means 1. Parallel electrodes 27, 28 made of a non-magnetic conductive material are arranged downstream in the transport direction, and by applying a positive potential to the lower electrode 28 and a negative potential to the upper electrode 27, the positively charged substance is applied to the electrode. When passing through the space, it is attracted to the negative electrode 27. At this time, the magnetic force generating means 1
The force of attracting the magnetic substance by is set to be larger than the force of attracting the charged substance to the electrodes by the electrodes 27 and 28. Therefore, of the collected substances 5, 6 conveyed between the electrodes 27, 28, the non-magnetic foreign matter 6 is attracted to the minus electrode 27, but the magnetic toner 5 is attracted to the conveying plate 30 even if it is positively charged. It remains as it is, and moves on the transport plate 30 while rotating further downstream. In this way, the magnetic substance and the non-magnetic substance are separated. Of course, here as well, the voltage applied between the electrodes, the magnetic force of the magnetic force generating means, the amount and material of the external additive added to the magnetic toner, and the charge amount for charging the magnetic toner depend on the separation of impurities contained in the magnetic toner. Determined by difficulty. In this embodiment, the collected magnetic toner is charged. That is, since the particle diameter of the external additive added to the toner from the beginning is much smaller than that of the magnetic toner, the amount of charge per weight of the external additive is larger than that of the magnetic toner, and thus the toner is easily attracted to the electrodes. The effect of separating the magnetic toner and the external additive is also increased. Of course, this embodiment can also be used in combination with the first and second embodiments and is more effective in separating impurities.
【００２６】本実施例においても複写機に投入して１０
万枚の通紙実験を行ったところ、濃度の低下、画像の欠
陥は起こらなかった。また１０万枚通紙後の磁性トナー
の帯電量は１０μＣ／ｇであった。Also in this embodiment, 10 is set in the copying machine.
As a result of carrying out a paper-passing test on 10,000 sheets, no decrease in density and no image defect occurred. The amount of charge of the magnetic toner after passing 100,000 sheets was 10 μC / g.
【００２７】第４実施例 図８に本発明の第４実施例を示す。本実施例においては
第１実施例の装置において、回収トナー搬送管３の途中
に、非磁性の板金２９を搬送管３との間隙を１５μｍに
保ち配した。これにより、非磁性物を分離できるのはも
とより、画像形成に不向きな粒径の大きなトナーも除去
できる。本実施例では搬送した回収トナーの粒径は１５
μｍ以下となる。Fourth Embodiment FIG. 8 shows a fourth embodiment of the present invention. In the present embodiment, in the apparatus of the first embodiment, a non-magnetic sheet metal 29 is arranged in the middle of the collected toner transport pipe 3 with a gap of 15 μm from the transport pipe 3. As a result, not only the non-magnetic substance can be separated, but also the toner having a large particle size, which is unsuitable for image formation, can be removed. In this embodiment, the particle size of the collected toner conveyed is 15
It becomes less than μm.
【００２８】本実施例を第１実施例の複写機に組み込み
１０万枚の通紙実験を行った。This embodiment was incorporated into the copying machine of the first embodiment and a paper feeding experiment of 100,000 sheets was conducted.
【００２９】本実施例を組み込まなかった装置では、現
像器中のトナーの平均粒径が初期１０μｍであったのに
１０万枚通紙後は１８μｍになり、現像シリンダ上に粒
径の特に大きなトナーが数多くみられ、画像上もその部
分は現像されずに小さい白い点となった。In the apparatus not incorporating this embodiment, the average particle diameter of the toner in the developing device was 10 μm in the initial stage, but became 18 μm after 100,000 sheets were passed, and the particle diameter was particularly large on the developing cylinder. A large amount of toner was seen, and even on the image, that portion was not developed and became a small white dot.
【００３０】本実施例を組み込んだ複写機においては１
０万枚通紙後の現像器中のトナーの平均粒径が１１．５
μｍで現像シリンダ上と画像上に異常はみられず、良好
な複写が行えた。In the copying machine incorporating this embodiment, 1
The average particle size of the toner in the developing device after passing 10,000 sheets is 11.5.
At μm, no abnormality was found on the developing cylinder and on the image, and good copying was possible.
【００３１】[0031]
【発明の効果】以上説明してきたように、ＮＳ極を交互
に配した磁力発生手段を磁性トナー搬送方向の逆の方向
に動かすことで磁性トナーに回転を起こして搬送すると
共に、該回転によって磁性トナーがほぐれ磁性トナー中
の非磁性の夾雑物を遊離し、外力を働かせてこれを分離
することによって、効果的に磁性トナー中の夾雑物を取
り除くことが可能になる。また、本実施例で示したいず
れかの方法を単独、もしくは併用することで、簡易で効
果的な分離手段、もしくは、強力な分離手段を提供する
ことが可能となる。As described above, by moving the magnetic force generating means having the NS poles alternately arranged in the direction opposite to the magnetic toner conveying direction, the magnetic toner is rotated and conveyed, and the magnetic toner is rotated by the rotation. The toner loosens the non-magnetic impurities in the magnetic toner and separates them by exerting an external force, so that the impurities in the magnetic toner can be effectively removed. In addition, by using any one of the methods shown in this embodiment alone or in combination, it is possible to provide a simple and effective separating means or a strong separating means.
【図１】（ａ）は本発明の第１実施例の非磁性粉体除去
装置の断面図。（ｂ）は磁力発生手段（トナー搬送手
段）の拡大図。（ｃ）は磁性トナーの移動状態を示した
図。FIG. 1A is a sectional view of a non-magnetic powder removing device according to a first embodiment of the present invention. (B) is an enlarged view of the magnetic force generating means (toner conveying means). FIG. 6C is a diagram showing a moving state of the magnetic toner.
【図２】本発明が適用可能な画像形成装置の概略構成
図。FIG. 2 is a schematic configuration diagram of an image forming apparatus to which the present invention is applicable.
【図３】本発明の第２実施例に適用されるトナー搬送手
段の断面図。FIG. 3 is a cross-sectional view of toner carrying means applied to a second embodiment of the present invention.
【図４】本発明の第２実施例の斜視図。FIG. 4 is a perspective view of a second embodiment of the present invention.
【図５】本発明の第２実施例の平面図。FIG. 5 is a plan view of the second embodiment of the present invention.
【図６】本発明の第３実施例の断面図。FIG. 6 is a sectional view of a third embodiment of the present invention.
【図７】本発明の第３実施例の部分拡大断面図。FIG. 7 is a partially enlarged sectional view of a third embodiment of the present invention.
【図８】本発明の第４実施例の断面図。FIG. 8 is a sectional view of a fourth embodiment of the present invention.
１ 磁力発生手段 ３ 搬送管 1 magnetic force generating means 3 carrier tube
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０３Ｇ 21/00 ３２６ Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location G03G 21/00 326
Claims (1)
性粉体を除去する非磁性粉体除去装置であって、粉体搬
送路と、この粉体搬送路に磁界を形成する手段と、磁性
粉体が搬送路内を移動するように磁界を変化させる手段
と、を有し、磁性粉体が搬送路内を移動している時に磁
力以外の外力を作用させて非磁性粉体を除去することを
特徴とする非磁性粉体除去装置。1. A non-magnetic powder removing device for removing non-magnetic powder from a mixture of magnetic powder and non-magnetic powder, comprising a powder carrying path and a magnetic field formed in the powder carrying path. Means and a means for changing the magnetic field so that the magnetic powder moves in the transfer path, and when the magnetic powder is moving in the transfer path, an external force other than the magnetic force is applied to the non-magnetic powder. A non-magnetic powder removing device characterized by removing a body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5334359A JPH07185389A (en) | 1993-12-28 | 1993-12-28 | Nonmagnetic powder removing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5334359A JPH07185389A (en) | 1993-12-28 | 1993-12-28 | Nonmagnetic powder removing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07185389A true JPH07185389A (en) | 1995-07-25 |
Family
ID=18276495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5334359A Withdrawn JPH07185389A (en) | 1993-12-28 | 1993-12-28 | Nonmagnetic powder removing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07185389A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7636536B2 (en) * | 2005-09-07 | 2009-12-22 | Ricoh Company, Ltd. | Image forming apparatus having an improved developer conveying system |
-
1993
- 1993-12-28 JP JP5334359A patent/JPH07185389A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7636536B2 (en) * | 2005-09-07 | 2009-12-22 | Ricoh Company, Ltd. | Image forming apparatus having an improved developer conveying system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
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