JPH0616214B2 - Electrophotographic developing device - Google Patents
Electrophotographic developing deviceInfo
- Publication number
- JPH0616214B2 JPH0616214B2 JP59119857A JP11985784A JPH0616214B2 JP H0616214 B2 JPH0616214 B2 JP H0616214B2 JP 59119857 A JP59119857 A JP 59119857A JP 11985784 A JP11985784 A JP 11985784A JP H0616214 B2 JPH0616214 B2 JP H0616214B2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- toner
- magnetic powder
- magnet roll
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】 〔 産業上の利用分野 〕 本発明は電子写真記録の現像工程に用いられる現像装置
に関するもので、特に現像ロールを利用した乾式の現像
装置に関する。Description: TECHNICAL FIELD The present invention relates to a developing device used in a developing step of electrophotographic recording, and more particularly to a dry developing device using a developing roll.
電子写真記録は、周知のように感光ドラム上に形成され
た静電潜像を現像してトナー像化し、これを転写紙に転
写した後、定着させて画像記録を得るものである。In the electrophotographic recording, as is well known, an electrostatic latent image formed on a photosensitive drum is developed into a toner image, which is transferred onto a transfer paper and then fixed to obtain an image recording.
このような電子写真記録の現像工程に用いられる乾式の
現像装置として現像ロールを利用したものがあり、この
現像装置では、一般に磁性粉体とトナーとの２種類の粉
体を混合した現像剤を前記現像ロールにより現像位置に
搬送して、前記静電潜像の現像を行うが、この場合感光
ドラム上に付着するのはトナーのみで、磁性粉体は殆ど
付着しないため、トナーに較べて磁性粉体の消費量はほ
んの僅かである。As a dry developing device used in such a developing process of electrophotographic recording, there is a developing device utilizing a developing roll. In this developing device, generally, a developer obtained by mixing two kinds of powders of magnetic powder and toner is used. The electrostatic latent image is developed by being conveyed to the developing position by the developing roll. In this case, only the toner adheres to the photosensitive drum, and the magnetic powder hardly adheres. The powder consumption is very low.
しかし、良質な現像を行うには磁性粉体とトナーの混合
比率を保つ必要があり、そのため従来は磁性粉体とトナ
ーの混合比率を測定して、トナーを逐次補給する等の手
段を講じているが、これによると装置が大形となり、か
つ正確な測定が難しいため安定性に欠けるという問題が
あった。However, in order to perform high-quality development, it is necessary to maintain the mixing ratio of the magnetic powder and the toner. Therefore, conventionally, the mixing ratio of the magnetic powder and the toner is measured, and measures such as replenishing the toner sequentially are taken. However, according to this, there is a problem in that the device becomes large in size and the stability is insufficient because accurate measurement is difficult.
また、磁性トナーを磁性粉体として使用する場合は、磁
性トナーの消費量も大きいので補給する必要が生じる
が、磁性トナーの消費量を検出することは困難である。Further, when the magnetic toner is used as the magnetic powder, the magnetic toner also consumes a large amount and needs to be replenished, but it is difficult to detect the magnetic toner consumption.
本発明はこのような従来の技術における問題点を解決す
ることを目的とするものである。The present invention aims to solve the above problems in the conventional technique.
この目的を達成するため、本発明の電子写真現像装置
は、感光ドラムの近傍に設置され、該感光ドラムと対向
する位置に現像用の開口部を設けたトナーホッパと、前
記トナーホッパの開口部内に配置され、円周方向にＮ極
とＳ極とを交互に着磁したマグネットロールと該マグネ
ットロールの外側に同心状に配置された非磁性金属によ
るスリーブとより成り、かつ該マグネットロールをスリ
ーブより速い速度でかつスリーブと同方向に回転する構
造とした現像ロールと、前記トナーホッパ内を第１の収
容部と第２の収容部とに分けるように先端を前記スリー
ブに接触させて前記トナーホッパ内に設けた仕切板と、
前記第１の収容部に収容され、前記マグネットロールの
磁力により前記スリーブの周面に吸着されて層を成し、
前記マグネットロール及び前記スリーブの回転により前
記層の上部側は前記第１の収容部から前記スリーブと前
記感光ドラムとの間の現像位置を経て第２の収容部内で
前記仕切板に至るように搬送されて前記仕切板の位置で
前記層の下部側に回り込み、前記層の下部側は前記仕切
板から前記現像位置を経て前記第１の収容部に至るよう
に搬送される磁性粉体と、前記第２の収容部に収納さ
れ、前記マグネットロール及び前記スリーブの回転によ
り前記第２の収容部内に搬送されてくる前記磁性粉体に
一定量混入して、磁性粉体と共に前記現像位置に搬送さ
れるトナーを備えたことを特徴とする。In order to achieve this object, an electrophotographic developing device of the present invention is provided in the vicinity of a photosensitive drum, and a toner hopper provided with an opening for development at a position facing the photosensitive drum, and an electrophotographic developing device arranged in the opening of the toner hopper. And a magnet roll in which N poles and S poles are alternately magnetized in the circumferential direction, and a sleeve made of a non-magnetic metal and arranged concentrically outside the magnet roll. The magnet roll is faster than the sleeve. A developing roll configured to rotate at the speed and in the same direction as the sleeve, and provided in the toner hopper with a tip end thereof in contact with the sleeve so as to divide the toner hopper into a first accommodating portion and a second accommodating portion. Partition plate,
It is housed in the first housing part and is attracted to the peripheral surface of the sleeve by the magnetic force of the magnet roll to form a layer,
By the rotation of the magnet roll and the sleeve, the upper side of the layer is conveyed from the first accommodating portion to the partition plate in the second accommodating portion through the developing position between the sleeve and the photosensitive drum. And the magnetic powder conveyed to the lower side of the layer at the position of the partition plate, and the lower side of the layer is conveyed from the partition plate through the developing position to the first accommodating portion, and The magnetic powder, which is stored in the second storage portion and is conveyed into the second storage portion by the rotation of the magnet roll and the sleeve, is mixed in a certain amount and is conveyed to the developing position together with the magnetic powder. Is provided with a toner.
このような構成を有する本発明は、第１の収容部から供
給される磁性粉体をスリーブの周面に吸着して、この磁
性粉体をマグネットロールとスリーブの回転により現像
位置を通過させて第２の収容部に搬送し、第２の収容部
内で磁性粉体にトナーに混入させた後、このトナーに混
入した磁性粉体の搬送方向を仕切板の位置で反転させ
て、現像位置に搬送するようにしているため、簡単な構
造でスリーブ上での磁性粉体とトナーの混合比率を常に
一定に保つことができる。According to the present invention having such a configuration, the magnetic powder supplied from the first accommodating portion is attracted to the peripheral surface of the sleeve, and the magnetic powder is passed through the developing position by the rotation of the magnet roll and the sleeve. After being conveyed to the second accommodating portion and mixed with the magnetic powder in the toner in the second accommodating portion, the conveying direction of the magnetic powder mixed in the toner is reversed at the position of the partition plate to reach the developing position. Since the toner is conveyed, the mixing ratio of the magnetic powder and the toner on the sleeve can be always kept constant with a simple structure.
また、磁性粉体とトナーを仕切板により仕切られた第１
と第２の収容部に別々に収容しているため、トナーの消
費量を容易に検出することが可能となり、トナーと磁性
粉体の補給も別々に行えるため、長期間安定して良質な
現像を行うことができる。In addition, the first partition which separates the magnetic powder and the toner by a partition plate
Since the toner is separately stored in the second storage unit and the second storage unit, the toner consumption amount can be easily detected, and the toner and the magnetic powder can be supplied separately, so that stable development for a long time and high quality can be achieved. It can be performed.
以下図面を参照して実施例を説明する。 Embodiments will be described below with reference to the drawings.
図面は本発明による電子写真現像装置の一実施例を示す
概略的な断面図で、図において１は感光ドラムであり、
その表面には図示しない公知の静電荷の潜像形成手段に
より静電潜像が形成されている。1 is a schematic sectional view showing an embodiment of an electrophotographic developing apparatus according to the present invention, in which 1 is a photosensitive drum,
An electrostatic latent image is formed on the surface by a known electrostatic latent image forming means (not shown).
２は前記感光ドラム１の近傍に設置されたトナーホッパ
で、感光ドラム１と対向する位置に現像用の開口部３を
有しており、この開口部３内に現像ロール４が感光ドラ
ム１に対して平行にかつ一定の間隙を保って配置されて
いる。A toner hopper 2 is provided in the vicinity of the photosensitive drum 1 and has a developing opening 3 at a position facing the photosensitive drum 1, and a developing roll 4 is provided in the opening 3 with respect to the photosensitive drum 1. Parallel to each other and with a constant gap.
現像ロール４は、円周方向にＮ極とＳ極とを交互に着磁
したマグネットロール５と、非磁性金属により形成され
た円筒状のスリーブ６とで構成され、このスリーブ６を
前記マグネットロール５の外側に同心状に配置すると共
に、両者が矢印で示した方向にそれぞれ独立して回転す
る構造となっている。The developing roll 4 is composed of a magnet roll 5 in which N and S poles are alternately magnetized in the circumferential direction, and a cylindrical sleeve 6 formed of a non-magnetic metal. The sleeve 6 is used as the magnet roll. 5, they are concentrically arranged outside and are rotated independently in the directions shown by the arrows.
７は仕切板で、先端が前記スリーブ６と接触するように
トナーホッパ２内に設けられている。A partition plate 7 is provided in the toner hopper 2 so that the tip of the partition plate contacts the sleeve 6.
この仕切板７によりトナーホッパ２内は第１の収容部８
と第２の収容部９とに２分割され、感光ドラム１側に位
置する第１の収容部８内には磁性粉体１０が、また第２
の収容部９にはトナー１１がそれぞれ収容されている。With this partition plate 7, the inside of the toner hopper 2 has a first accommodating portion 8
And the second accommodating portion 9 are divided into two parts, and the magnetic powder 10 and the second accommodating portion are provided in the first accommodating portion 8 located on the photosensitive drum 1 side.
The toner 11 is stored in the storage portion 9 of each.
この磁性粉体１０とトナー１１は本発明における現像剤
を成すもので、ここで磁性粉体１０はキャリアといわれ
る鉄粉あるいはプラスチックと磁性鉄粉を主成分とする
磁性がかなり強い磁性トナーであり、一方トナー１１は
プラスチックを主成分とする粉体あるいは磁性が弱い磁
性トナーである。The magnetic powder 10 and the toner 11 form a developer in the present invention. Here, the magnetic powder 10 is a magnetic toner mainly composed of iron powder or plastic and magnetic iron powder, which is called a carrier, and has a considerably strong magnetism. On the other hand, the toner 11 is a powder containing plastic as a main component or a magnetic toner having weak magnetism.
磁性トナーの場合、マグネットロール５の磁極の強さに
依存するが、飽和磁化量が約３０emu ／ｇ以下の磁性ト
ナーは、トナー１１として使用することができる。In the case of a magnetic toner, a magnetic toner having a saturation magnetization amount of about 30 emu / g or less can be used as the toner 11 depending on the strength of the magnetic pole of the magnet roll 5.
次に作用について説明する。Next, the operation will be described.
まず、磁性粉体１０の搬送について説明すると、現像ロ
ール４のマグネットロール５は、例えば１０００rpm 程
度の高速で矢印方向に回転し、一方スリーブ６は２０rp
m 程度の低速で同方向に回転する。First, the conveyance of the magnetic powder 10 will be described. The magnet roll 5 of the developing roll 4 rotates in the direction of the arrow at a high speed of, for example, about 1000 rpm, while the sleeve 6 has 20 rp.
Rotate in the same direction at a low speed of about m.
トナーホッパ２の第１の収容部８に収容されている磁性
粉体１０は、最初マグネットロール５の磁力によってス
リーブ６上に連鎖状に吸着され、そしてマグネットロー
ル５が回転することで発生する磁力線の略回転により前
記連鎖状の磁性粉体１０はマグネットロール５及びスリ
ーブ６の回転方向と逆の方向にスリーブ６の周面に沿っ
て自転運動する。The magnetic powder 10 accommodated in the first accommodating portion 8 of the toner hopper 2 is first adsorbed in a chain shape on the sleeve 6 by the magnetic force of the magnet roll 5, and the magnetic force lines generated by the rotation of the magnet roll 5 are generated. By the substantial rotation, the chain-shaped magnetic powder 10 rotates around the peripheral surface of the sleeve 6 in the direction opposite to the rotating direction of the magnet roll 5 and the sleeve 6.
この磁性粉体１０の自転運動は、第１の収容部８の出口
からスリーブ６と感光ドラム１との間、及びスリーブ６
とトナーホッパ２の底面との間を経て、トナーホッパ２
の第２の収容部９内で仕切板７に到達するまで行われ、
これによりスリーブ６の周面にて一定の厚さの磁性粉体
１０の層が形成される。The rotation of the magnetic powder 10 is caused by the rotation of the outlet of the first housing portion 8 between the sleeve 6 and the photosensitive drum 1 and the sleeve 6.
And the bottom surface of the toner hopper 2, and then the toner hopper 2
Until the partition plate 7 is reached in the second accommodating portion 9 of
As a result, a layer of the magnetic powder 10 having a constant thickness is formed on the peripheral surface of the sleeve 6.
ここで、マグネットロール５と一方スリーブ６の回転が
継続されると、磁性粉体１０の層の上部側はマグネット
ロール５及びスリーブ６の回転方向と逆の方向に搬送さ
れ、磁性粉体１０の層の下部側はマグネットロール５及
びスリーブ６の回転方向と同じ方向に搬送される。Here, when the rotation of the magnet roll 5 and the one-sided sleeve 6 is continued, the upper side of the layer of the magnetic powder 10 is conveyed in the direction opposite to the rotating direction of the magnet roll 5 and the sleeve 6, and the magnetic powder 10 The lower side of the layer is conveyed in the same direction as the rotating direction of the magnet roll 5 and the sleeve 6.
このように磁性粉体１０の層の上部側と下部側が逆の方
向に搬送されるのは、マグネットロール５を回転速度
を、スリーブ６の回転速度より大きくしていることによ
るものである。In this way, the upper side and the lower side of the layer of the magnetic powder 10 are conveyed in the opposite directions because the rotational speed of the magnet roll 5 is made higher than the rotational speed of the sleeve 6.
すなわち、本出願人により既に出願された特開昭５９−
６８７６２号に述べられているように、スリーブ６上に
おける磁性粉体１０の層の上部側の搬送は主としてマグ
ネットロール５の回転に依存し、磁性粉体１０の層の下
部側の搬送は主としてスリーブ６の回転に依存する。That is, Japanese Patent Application Laid-Open No. 59-59
As described in No. 68762, the conveyance of the upper side of the layer of magnetic powder 10 on the sleeve 6 depends mainly on the rotation of the magnet roll 5, and the conveyance of the lower side of the layer of magnetic powder 10 mainly on the sleeve. It depends on the rotation of 6.
この場合のスリーブ６による搬送の拘束力は、マグネッ
トロール５への磁気吸引力のスリーブ６面に垂直な成分
に対応する摩擦力と考えられ、磁性粉体１０の搬送速度
はスリーブ６の回転速度と同速度となる。In this case, the constraint force of the conveyance by the sleeve 6 is considered to be a frictional force corresponding to a component of the magnetic attraction force to the magnet roll 5 which is perpendicular to the surface of the sleeve 6, and the conveyance speed of the magnetic powder 10 is the rotation speed of the sleeve 6. It will be the same speed as.
一方、マグネットロール５による搬送は、前記のように
磁力線の略回転による連鎖状の磁性粉体１０の自転運動
であり、搬送速度はマグネットロール５の磁極数，回転
数，及び連鎖の長さの三者の積にほぼ等しく、スリーブ
６による搬送速度より速いものとなる。On the other hand, the transportation by the magnet roll 5 is the rotational movement of the chain-like magnetic powder 10 due to the substantial rotation of the magnetic force lines as described above, and the transportation speed depends on the number of magnetic poles of the magnet roll 5, the number of rotations, and the length of the chain. It is almost equal to the product of the three, and is faster than the conveying speed by the sleeve 6.
このマグネットロール５により搬送された磁性粉体１０
の層の上部側は、トナーホッパ２の第２の収容部９内で
仕切板７により止められる。Magnetic powder 10 conveyed by this magnet roll 5
The upper side of this layer is stopped by the partition plate 7 in the second accommodating portion 9 of the toner hopper 2.
これにより磁性粉体１０の層の上部側は搬送速度が落
ち、スリーブ６による搬送速度より遅くなるため、それ
までマグネットロール５により拘束されていた磁性粉体
１０の層の上部側は仕切板７の位置でスリーブ６による
拘束力を受ける。As a result, the upper part of the layer of the magnetic powder 10 has a lower conveyance speed and becomes slower than the conveyance speed of the sleeve 6. Therefore, the upper part of the layer of the magnetic powder 10 which has been constrained by the magnet roll 5 is separated by the partition plate 7. The binding force of the sleeve 6 is received at the position.
その結果、磁性粉体１０の層の上部側は仕切板７の位置
で下部側に回り込むという現象が生じ、下部側に回り込
んだ磁性粉体１０は搬送方向が反転されてスリーブ６に
より第１の収容部８側に向かって前記とは逆に搬送され
て行く。As a result, there occurs a phenomenon that the upper side of the layer of the magnetic powder 10 wraps around to the lower side at the position of the partition plate 7, and the magnetic powder 10 wrapping around to the lower side has its conveying direction reversed and the sleeve 6 causes the first The sheet is conveyed in the opposite direction to the accommodation portion 8 side.
このように磁性粉体１０の層の上部側が第１の第１の収
容部８からスリーブ６と感光ドラム１との間を経て第２
の収容部９内に搬送され、下部側は第２の収容部９内の
仕切板７の位置からはスリーブ６と感光ドラム１との間
を経て第１の収容部８へ搬送されるという往復搬送が行
われるものであり、搬送中磁性粉体１０はマグネットロ
ール５の磁力により常時スリーブ６の周面に吸着される
ことから離れることはない。In this way, the upper side of the layer of the magnetic powder 10 passes through the space between the sleeve 6 and the photosensitive drum 1 from the first first accommodating portion 8 to the second side.
Of the partition plate 7 in the second accommodating section 9 from the position of the partition plate 7 in the second accommodating section 9 to the first accommodating section 8 via the sleeve 6 and the photosensitive drum 1. Since the magnetic powder 10 is conveyed, the magnetic powder 10 is always adsorbed on the peripheral surface of the sleeve 6 by the magnetic force of the magnet roll 5 during the conveyance, and is never separated.
また、磁性粉体１０の層の厚さは、マグネットロール５
とスリーブ６の回転速度によって調整され、スリーブ６
と感光ドラム１との間の現像位置における現像間隙に適
した層厚が得られる。The thickness of the layer of the magnetic powder 10 is the same as that of the magnet roll 5
And the rotation speed of the sleeve 6
A layer thickness suitable for the development gap between the photosensitive drum 1 and the photosensitive drum 1 can be obtained.
次に、現像について説明すると、本発明では前述した磁
性粉体１０とトナー１１とが現像剤として使用される。Next, development will be described. In the present invention, the magnetic powder 10 and the toner 11 described above are used as a developer.
そこで、前述の如く磁性粉体１０が搬送されると、この
磁性粉体１０はスリーブ６と感光ドラム１との間の現像
位置を経て第２の収容部９内に入り、更に仕切板７に至
るので、第２の収容部９内に入ってから仕切板７に至る
までの途中に第２の収容部９内のトナー１１と接触す
る。Therefore, when the magnetic powder 10 is conveyed as described above, the magnetic powder 10 enters the second accommodating portion 9 through the developing position between the sleeve 6 and the photosensitive drum 1 and further on the partition plate 7. Therefore, the toner 11 in the second accommodating section 9 comes into contact with the toner in the second accommodating section 9 on the way to the partition plate 7.
これによりトナー１１は摩擦帯電によって磁性粉体１０
と静電的に結合するか、あるいはトナー１１が磁性トナ
ーの場合には磁気的に結合するため、トナー１１は磁性
粉体１０の中に混入し、磁性粉体１０と共に搬送され
る。As a result, the toner 11 is magnetically charged to the magnetic powder 10 by frictional charging.
Since the toner 11 is electrostatically coupled to the magnetic powder 10 or magnetically coupled to the toner 11 when the toner 11 is a magnetic toner, the toner 11 is mixed in the magnetic powder 10 and conveyed together with the magnetic powder 10.
このときの磁性粉体１０の中へのトナー１１の混入量
は、静電的結合の場合では、磁性粉体１０に対するトナ
ー１１の付着量が飽和するので一定となり、また磁気的
に結合する場合にしても、トナー１１は単独で磁気的に
搬送されることはないので、混入量は一定となる。In this case, the amount of the toner 11 mixed in the magnetic powder 10 is constant in the case of electrostatic coupling because the amount of toner 11 adhered to the magnetic powder 10 is saturated, and in the case of magnetic coupling. However, since the toner 11 is not magnetically conveyed by itself, the mixing amount is constant.
磁性粉体１０の搬送方向は前記のように仕切板７の位置
で反転するため、一定量のトナー１１が混入した磁性粉
体１０は再びスリーブ６と感光ドラム１との間の現像位
置に達し、これにより感光ドラム１に一定量のトナー１
１が供給される。Since the conveying direction of the magnetic powder 10 is reversed at the position of the partition plate 7 as described above, the magnetic powder 10 mixed with a certain amount of toner 11 reaches the developing position between the sleeve 6 and the photosensitive drum 1 again. , By this, a certain amount of toner 1 on the photosensitive drum 1.
1 is supplied.
従って、トナー１１は現像位置で静電吸引力により感光
ドラム１上に付着し、これにより感光ドラム１上の静電
潜像の現像が行われる。Therefore, the toner 11 is attached to the photosensitive drum 1 by the electrostatic attraction force at the developing position, whereby the electrostatic latent image on the photosensitive drum 1 is developed.
このとき、磁性粉体１０にはマグネットロール５の磁気
吸引力が強く作用しており、そのため磁性粉体１０はス
リーブ６上に保持され、消費されることは殆どない。At this time, the magnetic attraction force of the magnet roll 5 strongly acts on the magnetic powder 10, so that the magnetic powder 10 is held on the sleeve 6 and is hardly consumed.
現像後、磁性粉体１０は第１の収容部８に向かって更に
搬送されるが、磁性粉体１０は第１の収容部８の出口と
仕切板７との間を往復搬送されるので、トナー１１が第
１の収容部８内に混入することはない。After development, the magnetic powder 10 is further conveyed toward the first accommodating portion 8, but since the magnetic powder 10 is reciprocally conveyed between the outlet of the first accommodating portion 8 and the partition plate 7, The toner 11 never mixes into the first containing portion 8.
尚、本発明では、トナー１１の補給は、トナー１１と第
２の収容部９へ入れることにより行う。磁性粉体１０は
現像によって消費される量はわずかであるため、殆ど補
給する必要はないが、補給する場合は第１の収容部８へ
入れればよい。In the present invention, the toner 11 is replenished by putting it in the toner 11 and the second container 9. Since the amount of the magnetic powder 10 consumed by the development is small, it is almost unnecessary to replenish the magnetic powder 10. However, when replenishing it, the magnetic powder 10 may be placed in the first container 8.
また、磁性粉体１０とトナー１１は仕切板７によって分
離した第１の収容部８と第２の収容部９に別々に収容さ
れているので、公知の適当な検出手段により、それぞれ
の消費量を容易に検出することが可能である。Further, since the magnetic powder 10 and the toner 11 are separately stored in the first storage portion 8 and the second storage portion 9 separated by the partition plate 7, the consumption amount of each of them is determined by a known appropriate detecting means. Can be easily detected.
以上説明したように本発明は、第１の収容部から供給さ
れる磁性粉体をスリーブの周面に吸着して、この磁性粉
体をマグネットロールとスリーブの回転により現像位置
を通過させて第２の収容部に搬送し、第２の収容部内で
磁性粉体にトナーに混入させた後、このトナーに混入し
た磁性粉体の搬送方向を仕切板の位置で反転させて、現
像位置に搬送するようにしているため、簡単な構造でス
リーブ上での磁性粉体とトナーの混合比率を常に一定に
保つことができるという効果が得られる。As described above, according to the present invention, the magnetic powder supplied from the first accommodating portion is attracted to the peripheral surface of the sleeve, and the magnetic powder is passed through the developing position by the rotation of the magnet roll and the sleeve. The magnetic powder mixed in the toner is mixed with the toner in the second container, the conveying direction of the magnetic powder mixed in the toner is reversed at the position of the partition plate, and the magnetic powder is conveyed to the developing position. Therefore, it is possible to obtain the effect that the mixing ratio of the magnetic powder and the toner on the sleeve can always be kept constant with a simple structure.
また、磁性粉体とトナーを仕切板により仕切られた第１
と第２の収容部に別々に収容しているため、トナーの消
費量を容易に検出することが可能となり、トナーと磁性
粉体の補給も別々に行えるため、長期間安定して良質な
現像を行うことができるという効果も得られる。In addition, the first partition which separates the magnetic powder and the toner by a partition plate
Since the toner is separately stored in the second storage unit and the second storage unit, the toner consumption amount can be easily detected, and the toner and the magnetic powder can be supplied separately, so that stable development for a long time and high quality can be achieved. The effect of being able to perform is also obtained.
従って、本発明は電子写真記録を行う複写機やプリンタ
の現像装置として有効に利用することができる。Therefore, the present invention can be effectively used as a developing device for a copying machine or a printer that performs electrophotographic recording.
図面は本発明による電子写真現像装置の一実施例を示す
概略的な断面図である。 １……感光トラム ２……トナーホッパ ３……開口部 ４……現像ロール ５……マグネットロール ６……スリーブ ７……仕切板 ８……第１の収容部 ９……第２の収容部 １０……磁性粉体 １１……トナーThe drawings are schematic sectional views showing an embodiment of the electrophotographic developing apparatus according to the present invention. 1 ... Photosensitive tram 2 ... Toner hopper 3 ... Opening portion 4 ... Developing roll 5 ... Magnet roll 6 ... Sleeve 7 ... Partition plate 8 ... First storage portion 9 ... Second storage portion 10 ...... Magnetic powder 11 …… Toner
───────────────────────────────────────────────────── フロントページの続き (72)発明者 伊東 真一 東京都港区虎ノ門１丁目７番12号 沖電気 工業株式会社内 (56)参考文献 特開 昭54−73054（ＪＰ，Ａ) 特開 昭59−68762（ＪＰ，Ａ) 特開 昭58−202466（ＪＰ，Ａ) 特開 昭59−53870（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Ito 1-7-12 Toranomon, Minato-ku, Tokyo Within Oki Electric Industry Co., Ltd. (56) Reference JP-A-54-73054 (JP, A) JP-A-SHO 59-68762 (JP, A) JP-A-58-202466 (JP, A) JP-A-59-53870 (JP, A)
Claims (1)
ムと対向する位置に現像用の開口部を設けたトナーホッ
パと、 前記トナーホッパの開口部内に配置され、円周方向にＮ
極とＳ極とを交互に着磁したマグネットロールと該マグ
ネットロールの外側に同心状に配置された非磁性金属に
よるスリーブとより成り、かつ該マグネットロールをス
リーブより速い速度でかつスリーブと同方向に回転する
構造とした現像ロールと、 前記トナーホッパ内を第１の収容部と第２の収容部とに
分けるように先端を前記スリーブに接触させて前記トナ
ーホッパ内に設けた仕切板と、 前記第１の収容部に収容され、前記マグネットロールの
磁力により前記スリーブの周面に吸着されて層を成し、
前記マグネットロール及び前記スリーブの回転により前
記層の上部側は前記第１の収容部から前記スリーブと前
記感光ドラムとの間の現像位置を経て第２の収容部内で
前記仕切板に至るように搬送されて前記仕切板の位置で
前記層の下部側に回り込み、前記層の下部側は前記仕切
板から前記現像位置を経て前記第１の収容部に至るよう
に搬送される磁性粉体と、 前記第２の収容部に収納され、前記マグネットロール及
び前記スリーブの回転により前記第２の収容部内に搬送
されてくる前記磁性粉体に一定量混入して、磁性粉体と
共に前記現像位置に搬送されるトナーを備えたことを特
徴とする電子写真現像装置。1. A toner hopper installed near a photosensitive drum and provided with a developing opening at a position facing the photosensitive drum; and a toner hopper arranged in the opening of the toner hopper and arranged in a circumferential direction of N.
The magnet roll is composed of magnet poles and S poles which are alternately magnetized, and a sleeve made of a non-magnetic metal and arranged concentrically outside the magnet roll. The magnet roll is faster than the sleeve and in the same direction as the sleeve. A developing roll having a structure that rotates in a vertical direction; a partition plate provided inside the toner hopper by bringing the tip into contact with the sleeve so as to divide the inside of the toner hopper into a first accommodating portion and a second accommodating portion; It is housed in the housing part 1 and is attracted to the peripheral surface of the sleeve by the magnetic force of the magnet roll to form a layer,
By the rotation of the magnet roll and the sleeve, the upper side of the layer is conveyed from the first accommodating portion to the partition plate in the second accommodating portion through the developing position between the sleeve and the photosensitive drum. And magnetic powder that is circulated to the lower side of the layer at the position of the partition plate, and the lower side of the layer is conveyed from the partition plate through the developing position to the first accommodating portion, and The magnetic powder, which is stored in the second storage portion and is conveyed into the second storage portion by the rotation of the magnet roll and the sleeve, is mixed in a certain amount and is conveyed to the developing position together with the magnetic powder. An electrophotographic developing device, which is provided with a toner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59119857A JPH0616214B2 (en) | 1984-06-13 | 1984-06-13 | Electrophotographic developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59119857A JPH0616214B2 (en) | 1984-06-13 | 1984-06-13 | Electrophotographic developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60263976A JPS60263976A (en) | 1985-12-27 |
| JPH0616214B2 true JPH0616214B2 (en) | 1994-03-02 |
Family
ID=14771989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59119857A Expired - Lifetime JPH0616214B2 (en) | 1984-06-13 | 1984-06-13 | Electrophotographic developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0616214B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5473054A (en) * | 1977-11-22 | 1979-06-12 | Minolta Camera Co Ltd | Dry type developer replenishing device |
| JPS58202466A (en) * | 1982-04-30 | 1983-11-25 | Fujitsu Ltd | Developing method |
| IT1155911B (en) * | 1982-08-20 | 1987-01-28 | Olivetti & Co Spa | DEVELOPMENT UNIT FOR ELECTROPHOTOCOPIERS |
| JPS5968762A (en) * | 1982-10-12 | 1984-04-18 | Oki Electric Ind Co Ltd | Developing device for magnetic developing agent |
-
1984
- 1984-06-13 JP JP59119857A patent/JPH0616214B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60263976A (en) | 1985-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0267988B1 (en) | Electrographic magnetic brush development apparatus | |
| JPH0384573A (en) | Developing device | |
| GB2097294A (en) | Developing apparatus | |
| JPH0616214B2 (en) | Electrophotographic developing device | |
| US5115276A (en) | Magnetic brush development apparatus | |
| JPH0836300A (en) | Developing device | |
| WO2008060456A1 (en) | Development station for a reproduction apparatus | |
| JPH0583903B2 (en) | ||
| JP2609585B2 (en) | Developing device | |
| JP2901197B2 (en) | Developing device | |
| JPH0644082Y2 (en) | Magnet roll | |
| JPH03252686A (en) | Developing device | |
| US5426486A (en) | Toner monitor having magnetic field control | |
| JPS6332187B2 (en) | ||
| JPH0753086Y2 (en) | Development device | |
| JPS60176071A (en) | Developing device | |
| JPS6025075Y2 (en) | Development device for magnetic toner | |
| JPS60250376A (en) | Electrostatic latent image developing device | |
| JPS62201482A (en) | Toner concentration detector for developer | |
| JPH07152252A (en) | Developing device | |
| JP2002062736A (en) | Image forming apparatus | |
| JPS6275677A (en) | Developing device | |
| JPS6263968A (en) | Developing device | |
| JPS60153067A (en) | Magnetic brush developing roller | |
| JPH08137244A (en) | Developing device |