JPS6411943B2 - - Google Patents
Info
- Publication number
- JPS6411943B2 JPS6411943B2 JP4128580A JP4128580A JPS6411943B2 JP S6411943 B2 JPS6411943 B2 JP S6411943B2 JP 4128580 A JP4128580 A JP 4128580A JP 4128580 A JP4128580 A JP 4128580A JP S6411943 B2 JPS6411943 B2 JP S6411943B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- cylindrical sleeve
- toner
- magnetic cylindrical
- plate
- 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
Links
- 108091008695 photoreceptors Proteins 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
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】
本発明は磁性トナーを用いて静電潜像を顕像化
するための現像装置に係わり、特に非磁性円筒形
スリーブ表面の磁性トナーの量を一定量以下に制
御することにより常に安定な現像が可能となる現
像装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device for visualizing an electrostatic latent image using magnetic toner, and in particular to controlling the amount of magnetic toner on the surface of a non-magnetic cylindrical sleeve to below a certain amount. This invention relates to a developing device that enables stable development at all times.
第１図は従来の磁性トナー用現像装置の一例を
示す断面図である。従来の現像装置においては、
非磁性円筒形スリーブ２を固定し磁石ロール１を
図示矢印Ｘ方向に回転させトナー槽３内の磁性ト
ナー４を順次非磁性円筒形スリーブ２表面に供給
し、ドクター板６により所定厚さに形成された磁
気ブラシ４１を図示矢印Ｙ方向に移動せしめて、
図示矢印Ｚ方向に移動する感光体等の静電潜像担
持体５（以後感光体５と記す）に接触させて静電
潜像を顕像化するいわゆる磁石ロール回転方式
か、あるいは磁石ロール１を固定し、非磁性円筒
形スリーブ２を図示矢印Ｙ方向に回転せしめて形
成した磁気ブラシ４１を感光体５に接触させて静
電潜像を顕像化するいわゆるスリーブ回転方式に
より現像を行なうのが一般的であつた。 FIG. 1 is a sectional view showing an example of a conventional magnetic toner developing device. In conventional developing devices,
The non-magnetic cylindrical sleeve 2 is fixed and the magnet roll 1 is rotated in the direction of the arrow X shown in the figure to sequentially supply the magnetic toner 4 in the toner tank 3 onto the surface of the non-magnetic cylindrical sleeve 2 and form it to a predetermined thickness using a doctor plate 6. The magnetic brush 41 is moved in the direction of the arrow Y shown in the figure.
A so-called magnet roll rotation method is used, in which an electrostatic latent image is brought into contact with an electrostatic latent image carrier 5 (hereinafter referred to as photoreceptor 5) such as a photoreceptor moving in the direction of arrow Z in the figure, or a magnet roll 1 Developing is carried out by a so-called sleeve rotation method in which a magnetic brush 41 formed by rotating a non-magnetic cylindrical sleeve 2 in the direction of the arrow Y shown in the figure is brought into contact with the photoreceptor 5 to visualize the electrostatic latent image. was common.
しかしこのような現像装置はフアクシミリ、あ
るいはCPC複写機に用いられる場合にはその機
能を十分発揮できるものであつたが、次に述べる
ようにPPC複写機に使用しようとする場合には
その機能を十分発揮できるものとは限らない。磁
石ロール回転方式の場合、エンドレスドラムある
いはエンドレスベルトが感光体５として使用され
た時には、感光体５と非磁性円筒形スリーブ２と
の間に形成されたトナー溜り４２が大きく成長し
現像不良を生ずるという不具合がしばしば生ず
る。一方スリーブ回転方式の場合には非磁性円筒
形スリーブ２と感光体５との間隔（以後現像ギヤ
ツプと記す）を狭くすることができないため高抵
抗のPPC用磁性トナーを用いる場合良好な現像
条件を得ることは困難である。また磁気ブラシ４
１の流量規制板６と非磁性円筒形スリーブ２との
間に凝集したトナーあるいはほこり等が詰るとい
うような現象も生じ現像不良を生ずることがあつ
た。 However, although this type of developing device was able to fully demonstrate its functionality when used in facsimile or CPC copying machines, as will be described below, when it is used in PPC copying machines, its functionality cannot be fully demonstrated. It doesn't necessarily mean that you can perform to your full potential. In the case of the magnetic roll rotation method, when an endless drum or endless belt is used as the photoreceptor 5, the toner pool 42 formed between the photoreceptor 5 and the non-magnetic cylindrical sleeve 2 grows to a large extent, resulting in poor development. This problem often occurs. On the other hand, in the case of the sleeve rotation method, the gap between the non-magnetic cylindrical sleeve 2 and the photoreceptor 5 (hereinafter referred to as the developing gap) cannot be narrowed, so when using a high-resistance magnetic toner for PPC, good developing conditions are required. It is difficult to obtain. Also magnetic brush 4
In some cases, the gap between the flow rate regulating plate 6 and the non-magnetic cylindrical sleeve 2 becomes clogged with aggregated toner or dust, resulting in poor development.
これらの欠点を解消するものとして磁石ロール
１と非磁性円筒形スリーブ２とを同一方向に回転
し、かつ非磁性円筒形スリーブ２を比較的遅く回
転せしめるようにした現像装置が提案されてい
る。この現像装置は、特開昭54−119233号公報に
記載されている。しかしこの現像装置は現像性能
が優れている反面構造が複雑であることまた、ト
ナー掻き落し板付近からの装置外へのトナー飛散
あるいはトナーの逆流防止板付近でのトナー擬集
が発生するという難点がある。 To overcome these drawbacks, a developing device has been proposed in which the magnet roll 1 and the non-magnetic cylindrical sleeve 2 are rotated in the same direction, and the non-magnetic cylindrical sleeve 2 is rotated relatively slowly. This developing device is described in Japanese Patent Laid-Open No. 119233/1983. However, although this developing device has excellent developing performance, it has a complicated structure, and it also has the disadvantage of toner scattering outside the device near the toner scraping plate or toner aggregation near the toner backflow prevention plate. There is.
本発明の目的は上述した従来技術の問題点を解
消し構造が簡単で安定した現像性能が得られ、
PPC複写機等に用いられても問題のない現像装
置を提供することである。 The purpose of the present invention is to solve the problems of the prior art described above, to provide a simple structure and stable developing performance,
It is an object of the present invention to provide a developing device that does not cause problems even when used in a PPC copying machine or the like.
本発明の現像装置は、静電潜像担持体の表面に
対向して回転自在に配置された非磁性円筒形スリ
ーブと、前記非磁性円筒形スリーブの内部に回転
自在に配置された複数個の磁極を有する磁石ロー
ルと、前記非磁性円筒形スリーブの上方もしくは
側方に配置されそこに収容された磁性トナーを前
記非磁性円筒形スリーブ表面に供給するためのト
ナー流出口を有するトナー槽とを備え、前記磁石
ロールの回転数と前記非磁性円筒形スリーブの回
転数との比率がほぼ20以上となるように前記非磁
性円筒形スリーブと前記磁石ロールとを同一方向
に回転させることにより、前記磁性トナーを前記
非磁性円筒形スリーブ表面に沿つて搬送して磁気
ブラシを形成し、この磁気ブラシで前記静電潜像
担持体の表面を摺擦するようにした現像装置にお
いて、先端付近に長手方向に間隔をおいて形成さ
れた複数の開口を有する非磁性板を前記先端部が
前記非磁性円筒形スリーブ表面に接離自在となる
ように前記トナー槽に設置し、前記開口から前記
非磁性板の裏面にまわり込んだ磁性トナーに前記
磁石ロールの磁気吸引力が作用して前記非磁性板
が前記非磁性円筒形スリーブ表面に向かつて移動
し、前記トナー流出口から前記非磁性円筒形スリ
ーブ表面への磁性トナーの補給が停止されるよう
にしたことを特徴とするものである。 The developing device of the present invention includes a non-magnetic cylindrical sleeve rotatably disposed facing the surface of an electrostatic latent image carrier, and a plurality of non-magnetic cylindrical sleeves rotatably disposed inside the non-magnetic cylindrical sleeve. a magnet roll having magnetic poles; and a toner tank disposed above or to the side of the non-magnetic cylindrical sleeve and having a toner outlet for supplying the magnetic toner contained therein to the surface of the non-magnetic cylindrical sleeve. and rotating the non-magnetic cylindrical sleeve and the magnet roll in the same direction so that the ratio of the rotation speed of the magnet roll to the rotation speed of the non-magnetic cylindrical sleeve is approximately 20 or more. In a developing device in which magnetic toner is conveyed along the surface of the non-magnetic cylindrical sleeve to form a magnetic brush, and this magnetic brush rubs against the surface of the electrostatic latent image carrier, there is a longitudinal section near the tip. A non-magnetic plate having a plurality of openings formed at intervals in the direction is installed in the toner tank so that the tip thereof can freely approach and separate from the surface of the non-magnetic cylindrical sleeve, and The magnetic attraction force of the magnet roll acts on the magnetic toner that has wrapped around the back surface of the plate, and the non-magnetic plate moves toward the surface of the non-magnetic cylindrical sleeve, and the non-magnetic cylindrical sleeve is removed from the toner outlet. This is characterized in that the supply of magnetic toner to the surface is stopped.
以下図面により本発明を詳細に説明する。第２
図は本発明の一実施例を示す現像装置の断面図で
ある。磁石ロール１と非磁性円筒形スリーブ２は
図示矢印Ｘ方向に回転しそれぞれの回転数の比率
はほぼ20以上に設定される。このような回転数の
設定条件では感光体５と非磁性円筒形スリーブ２
との間を通り抜けた磁性トナー４３は図示矢印Ｙ
方向に搬送される。一方感光体５と非磁性円筒形
スリーブ２との間を通り抜けることのできない磁
性トナーにより磁性トナーの一定厚の層４４が感
光体５との接触面より、図示矢印Ｘ方向に向かつ
て形成される。この磁性トナーの一定厚の層４４
は磁石ロール１の回転数と非磁性円筒形スリーブ
２の回転数の比率がほぼ20以上となつた時に形成
され、非磁性円筒形スリーブ２の回転数が遅くな
るにつれて磁性トナーの一定厚の層４４の磁気ブ
ラシの穂長は大きくなる傾向を有している。この
ような磁性トナーの一定厚の層４４が形成された
場合には、感光体５との接触幅が常にほぼ一定で
あるため安定した現像が可能となる。また現像キ
ヤツプが小さくなつても現像領域にある磁性トナ
ーの一定厚の層４４はトナー槽３内の磁性トナー
４が非磁性円筒形スリーブ２表面に供給されるこ
とにより図示矢印Ｘ方向に順次成長していく。こ
の一定厚の層４４が図示矢印Ｘ方向に成長して感
光体５まで至つた場合、高抵抗の磁性トナーを用
いた場合には画像濃度が低下してしまう。従つて
磁性トナーの一定厚の層４４の成長を適当な所で
止める必要である。そのため本発明ではトナー槽
３に非磁性板６を設ける。 The present invention will be explained in detail below with reference to the drawings. Second
The figure is a sectional view of a developing device showing an embodiment of the present invention. The magnet roll 1 and the nonmagnetic cylindrical sleeve 2 rotate in the direction of the arrow X shown in the figure, and the ratio of their respective rotational speeds is set to approximately 20 or more. Under these rotation speed setting conditions, the photoreceptor 5 and the non-magnetic cylindrical sleeve 2
The magnetic toner 43 that has passed between
conveyed in the direction. On the other hand, due to the magnetic toner that cannot pass between the photoreceptor 5 and the non-magnetic cylindrical sleeve 2, a layer 44 of a certain thickness of magnetic toner is formed from the contact surface with the photoreceptor 5 in the direction of arrow X in the figure. . This layer 44 of constant thickness of magnetic toner
is formed when the ratio of the number of rotations of the magnet roll 1 and the number of rotations of the non-magnetic cylindrical sleeve 2 becomes approximately 20 or more, and as the number of rotations of the non-magnetic cylindrical sleeve 2 decreases, a layer of magnetic toner with a constant thickness is formed. The length of the magnetic brush No. 44 tends to increase. When such a layer 44 of a constant thickness of magnetic toner is formed, stable development is possible because the width of contact with the photoreceptor 5 is always approximately constant. Even if the developing cap becomes smaller, the layer 44 of magnetic toner with a constant thickness in the developing area grows sequentially in the direction of the arrow I will do it. If this constant thickness layer 44 grows in the direction of the arrow X in the figure and reaches the photoreceptor 5, the image density will decrease if a high-resistance magnetic toner is used. Therefore, it is necessary to stop the growth of the layer 44 of constant thickness of magnetic toner at an appropriate point. Therefore, in the present invention, a non-magnetic plate 6 is provided in the toner tank 3.
非磁性板６は外部から力が加わらないような状
態では第２図に実線で示したように先端部が非磁
性円筒形スリーブ２表面に長手方向に沿つて比較
的均一に近接するように配置される。この非磁性
板６は先端部付近に長手方向に所定の間隔をおい
て形成された複数個の開口６１を有している。開
口６１は非磁性円筒形スリーブ２の表面から一定
厚の層４４の磁気ブラシの穂長よりも小さい距離
だけ離れた位置にあるため、磁性トナーの一定厚
の層４４が成長しその先端部が開口６１まで達し
た場合、磁石ロール１の回転磁界により磁性トナ
ーの一定厚の層４４の先端部の磁性トナーは開口
６１を通過して非磁性板６の背面にまわり込むよ
うになる。この非磁性板６の背面にまわり込んだ
磁性トナー４５は磁石ロール１の磁気吸引力によ
り磁石ロール１に向かう力を受ける。従つて少な
くとも固定部分６２付近が弾性を有している場合
には非磁性板６は図示矢印Ｕ方向に移動し先端部
が非磁性円筒形スリーブ２表面に接触し図中破線
で示した位置に来る。この時トナー槽６の磁性ト
ナー４の補給部３１は非磁性板６でふさがれるの
で、磁性トナー４の補給が阻止される。従つて現
像により磁性トナーが消費された場合には、非磁
性板６上の磁性トナー４５が非磁性円筒形スリー
ブ２の表面に供給される。磁性トナー４５の量が
減少すると非磁性板６は弾性力により図示矢印Ｖ
方向に移動し元の設定位置に復帰するので、再び
トナー槽３から非磁性円筒形スリーブ２に補給さ
れるようになる。そして磁性トナーの一定厚の層
４４が再び図示矢印Ｘ方向へ成長を始めその先端
部が開口６１に到達すると、上記の現象が繰り返
される。このように本発明の現像装置においては
非磁性板６の図示矢印Ｕ及びＶ方向への移動によ
りトナー槽３内の磁性トナー４の非磁性円筒形ス
リーブ２表面への補給を制御することができる。
非磁性板６の図示矢印Ｕ及びＶ方向への移動は２
次的な電気的装置を必要とせず磁石ロール１と非
磁性円筒形スリーブ２とを同一方向に回転させ両
者の回転数の比率をほぼ20以上とした場合に形成
される磁性トナーの一定厚の層４４の特性を有効
に生かしたものであると言える。要するに非磁性
板６はトナー槽３内の磁性トナー４を非磁性円筒
形スリーブ２表面に補給する際の自動弁の如くの
役割を果たす。非磁性板６が図示矢印Ｕ方向に移
動し先端部が非磁性円筒形スリーブ２表面に接触
しても、非磁性円筒形スリーブ２の表面の磁性ト
ナーは開口６１を通つて搬送されるので、このト
ナーが狭圧され擬集することは本発明で採用して
いる磁石ロール１と非磁性円筒形スリーブ２とを
双方とも同一方向に回転させる方式においては発
生しない。また現像ギヤツプも本方式においては
0.25mm程度あるいはそれ以下の設定も可能であり
高抵抗の磁性トナーを用いて、良好な現像特性を
得ることができる。 When no external force is applied to the non-magnetic plate 6, the tip thereof is arranged relatively uniformly in the longitudinal direction of the surface of the non-magnetic cylindrical sleeve 2, as shown by the solid line in FIG. be done. This non-magnetic plate 6 has a plurality of openings 61 formed at predetermined intervals in the longitudinal direction near the tip. Since the opening 61 is located at a distance smaller than the length of the magnetic brush of the layer 44 of a constant thickness from the surface of the non-magnetic cylindrical sleeve 2, a layer 44 of a constant thickness of magnetic toner grows and its tip end. When reaching the opening 61 , the magnetic toner at the tip of the constant thickness layer 44 of magnetic toner passes through the opening 61 and wraps around the back surface of the non-magnetic plate 6 due to the rotating magnetic field of the magnet roll 1 . The magnetic toner 45 that has wrapped around the back surface of the non-magnetic plate 6 receives a force directed toward the magnet roll 1 due to the magnetic attraction force of the magnet roll 1. Therefore, when at least the vicinity of the fixed portion 62 has elasticity, the non-magnetic plate 6 moves in the direction of the arrow U shown in the figure, and the tip comes into contact with the surface of the non-magnetic cylindrical sleeve 2, reaching the position shown by the broken line in the figure. come. At this time, the replenishment portion 31 of the magnetic toner 4 in the toner tank 6 is blocked by the non-magnetic plate 6, so that replenishment of the magnetic toner 4 is prevented. Therefore, when the magnetic toner is consumed by development, the magnetic toner 45 on the non-magnetic plate 6 is supplied to the surface of the non-magnetic cylindrical sleeve 2. When the amount of magnetic toner 45 decreases, the non-magnetic plate 6 moves in the direction of arrow V due to elastic force.
Since the toner is moved in the direction and returned to the original setting position, the non-magnetic cylindrical sleeve 2 is replenished from the toner tank 3 again. Then, when the magnetic toner layer 44 having a constant thickness begins to grow again in the direction of the arrow X in the figure and its tip reaches the opening 61, the above phenomenon is repeated. As described above, in the developing device of the present invention, the replenishment of the magnetic toner 4 in the toner tank 3 to the surface of the non-magnetic cylindrical sleeve 2 can be controlled by moving the non-magnetic plate 6 in the directions of arrows U and V shown in the figure. .
The movement of the non-magnetic plate 6 in the directions of arrows U and V shown in the figure is 2.
A constant thickness of magnetic toner is formed when the magnet roll 1 and the non-magnetic cylindrical sleeve 2 are rotated in the same direction and the ratio of their rotational speeds is approximately 20 or more without the need for a secondary electrical device. It can be said that the characteristics of the layer 44 are effectively utilized. In short, the non-magnetic plate 6 functions like an automatic valve when replenishing the surface of the non-magnetic cylindrical sleeve 2 with the magnetic toner 4 in the toner tank 3. Even if the non-magnetic plate 6 moves in the direction of arrow U in the figure and its tip comes into contact with the surface of the non-magnetic cylindrical sleeve 2, the magnetic toner on the surface of the non-magnetic cylindrical sleeve 2 is transported through the opening 61. This narrow compression and agglomeration of toner does not occur in the method employed in the present invention in which both the magnet roll 1 and the non-magnetic cylindrical sleeve 2 are rotated in the same direction. In addition, the development gap is also
It is possible to set the thickness to about 0.25 mm or less, and good development characteristics can be obtained using a high-resistance magnetic toner.
第３図に非磁性板６の一例を示す。開口６は図
中では三角形を上下交互に配列した形となつてい
るが、開口は四角形などの他の形であつてもよ
い。またその大きさも上記の条件が満たされるな
らば不ぞろいであつてもよい。非磁性板６として
は弾性を有するもの例えば0.1ないし0.3mm程度の
厚さを有するポリエステル板あるいはリン青銅板
等が望ましいが、少なくとも固定部６２付近が弾
性を有していれば良い。また非磁性板６はその先
端部付近を非磁性円筒形スリーブ２の表面の曲率
とほぼ同一もしくは適度に折り曲げておいてもよ
く、あるいは平板でなく折れ曲がつた形状のもの
を使用しても本発明による現像装置の設計は容易
にできる。 An example of the non-magnetic plate 6 is shown in FIG. In the figure, the opening 6 has a shape in which triangles are alternately arranged vertically, but the opening may have another shape such as a square. Further, their sizes may also be irregular as long as the above conditions are satisfied. As the non-magnetic plate 6, it is desirable to use a material having elasticity, such as a polyester plate or a phosphor bronze plate having a thickness of about 0.1 to 0.3 mm, but it is sufficient that at least the vicinity of the fixed portion 62 has elasticity. In addition, the non-magnetic plate 6 may be bent at a curvature of approximately the same or moderately as the surface of the non-magnetic cylindrical sleeve 2 near its tip, or may be bent instead of a flat plate. A developing device according to the present invention can be easily designed.
以上に記述の如く本発明により適正な磁性トナ
ーの補給が可能となり、安定した現像を行なうこ
とができる。 As described above, the present invention enables proper replenishment of magnetic toner and enables stable development.
第１図は従来の現像装置の一例を示す断面図、
第２図は本発明の一実施例に係る現像装置の断面
図、第３図は非磁性板の一例を示す正面図であ
る。
１……磁石ロール、２……非磁性円筒形スリー
ブ、３……磁性トナー、６……非磁性板。
FIG. 1 is a sectional view showing an example of a conventional developing device.
FIG. 2 is a sectional view of a developing device according to an embodiment of the present invention, and FIG. 3 is a front view showing an example of a non-magnetic plate. 1...Magnet roll, 2...Nonmagnetic cylindrical sleeve, 3...Magnetic toner, 6...Nonmagnetic plate.
Claims (1)
配置された非磁性円筒形スリーブと、前記非磁性
円筒形スリーブの内部に回転自在に配置された複
数個の磁極を有する磁石ロールと、前記非磁性円
筒形スリーブの上方もしくは側方に配置され、そ
こに収容された磁性トナーを前記非磁性円筒形ス
リーブの表面に供給するためのトナー流出口を有
するトナー槽とを備え、前記静電潜像担持体の表
面と前記非磁性円筒形スリーブとの間を通り抜け
得る量以上の磁性トナーが前記トナー槽から前記
非磁性円筒形スリーブの表面に供給されかつ前記
磁石ロールの回転数と前記非磁性円筒形スリーブ
の回転数との比率がほぼ20以上となるように前記
非磁性円筒形スリーブと前記磁石ロールとを同一
方向に回転させることにより、前記静電潜像担持
体の表面と前記非磁性円筒形スリーブとの対向間
隙付近から前記非磁性円筒形スリーブの回転方向
に沿つて磁性トナーの一定厚の層を形成した現像
装置において、先端部付近に長手方向に間隔をお
いて形成された複数の開口を有する非磁性板を前
記先端部が前記非磁性円筒形スリーブの表面に接
離自在となるように前記トナー槽に設置すると共
に前記開口を前記非磁性円筒形スリーブの表面か
ら前記一定厚の層までの距離内に設定し、前記開
口から前記非磁性板の裏面にまわり込んだ磁性ト
ナーに前記磁石ロールの磁気吸引力が作用して前
記非磁性板が前記非磁性円筒形スリーブの表面に
向かつて移動し、前記トナー流出口から前記非磁
性円筒形スリーブの表面への磁性トナーの補給が
停止されるようにしたことを特徴とする現像装
置。1. A non-magnetic cylindrical sleeve rotatably disposed opposite to the surface of an electrostatic latent image carrier, and a magnet roll having a plurality of magnetic poles rotatably disposed inside the non-magnetic cylindrical sleeve. a toner tank disposed above or to the side of the non-magnetic cylindrical sleeve and having a toner outlet for supplying the magnetic toner contained therein to the surface of the non-magnetic cylindrical sleeve; Magnetic toner is supplied from the toner tank to the surface of the non-magnetic cylindrical sleeve in an amount greater than the amount that can pass between the surface of the electrolatent image carrier and the non-magnetic cylindrical sleeve, and the number of rotations of the magnetic roll and the By rotating the non-magnetic cylindrical sleeve and the magnet roll in the same direction so that the ratio to the rotation speed of the non-magnetic cylindrical sleeve is approximately 20 or more, the surface of the electrostatic latent image carrier and the In a developing device in which a layer of magnetic toner is formed with a constant thickness along the rotational direction of the non-magnetic cylindrical sleeve from near the opposing gap with the non-magnetic cylindrical sleeve, a layer of magnetic toner is formed near the tip at intervals in the longitudinal direction. A non-magnetic plate having a plurality of openings is installed in the toner tank so that the tip thereof can move toward and away from the surface of the non-magnetic cylindrical sleeve. The magnetic attraction force of the magnet roll acts on the magnetic toner that has passed around from the opening to the back surface of the non-magnetic plate, and the non-magnetic plate becomes the non-magnetic cylindrical sleeve. The developing device is configured to move towards the surface of the non-magnetic cylindrical sleeve, and stop supplying magnetic toner from the toner outlet to the surface of the non-magnetic cylindrical sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4128580A JPS56137374A (en) | 1980-03-31 | 1980-03-31 | Developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4128580A JPS56137374A (en) | 1980-03-31 | 1980-03-31 | Developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56137374A JPS56137374A (en) | 1981-10-27 |
| JPS6411943B2 true JPS6411943B2 (en) | 1989-02-27 |
Family
ID=12604166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4128580A Granted JPS56137374A (en) | 1980-03-31 | 1980-03-31 | Developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56137374A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0624449A (en) * | 1992-12-24 | 1994-02-01 | Mitsubishi Plastics Ind Ltd | Plastic bottle with handle |
| KR20230060383A (en) | 2021-10-27 | 2023-05-04 | 주식회사 에스이에이 | Plating apparatus including paddle having protrudent peak edge |
| KR20230069609A (en) | 2021-11-12 | 2023-05-19 | 주식회사 에스이에이 | Plating apparatus including paddle with rotating blade |
-
1980
- 1980-03-31 JP JP4128580A patent/JPS56137374A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0624449A (en) * | 1992-12-24 | 1994-02-01 | Mitsubishi Plastics Ind Ltd | Plastic bottle with handle |
| KR20230060383A (en) | 2021-10-27 | 2023-05-04 | 주식회사 에스이에이 | Plating apparatus including paddle having protrudent peak edge |
| KR20230069609A (en) | 2021-11-12 | 2023-05-19 | 주식회사 에스이에이 | Plating apparatus including paddle with rotating blade |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56137374A (en) | 1981-10-27 |
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