JPH0132051Y2 - - Google Patents
Info
- Publication number
- JPH0132051Y2 JPH0132051Y2 JP1981139509U JP13950981U JPH0132051Y2 JP H0132051 Y2 JPH0132051 Y2 JP H0132051Y2 JP 1981139509 U JP1981139509 U JP 1981139509U JP 13950981 U JP13950981 U JP 13950981U JP H0132051 Y2 JPH0132051 Y2 JP H0132051Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- sleeve
- blade
- toner
- magnet
- 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
- 238000011144 upstream manufacturing Methods 0.000 claims description 13
- 241001272720 Medialuna californiensis Species 0.000 claims description 2
- 210000005069 ears Anatomy 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Description
【考案の詳細な説明】
本考案は複写機の改良に関するものである。従
来の複写機の現像装置の代表的な構造は第１図に
示される。先ず、この従来例について図面に従が
い説明すると、１は複数本の磁石２……が外周に
埋設された不動の磁石ホルダである。そしてこれ
らの磁石２……は、磁石ホルダ１の外周に、交互
に反対極性が現われるように配備される。３は前
記磁石ホルダ１の外周に回転自在に嵌着された非
磁性スリーブで、図中反時計方向に回転付勢され
る。４は周側面に光導電物質がコーテイングされ
た感光体ドラムで、図示せぬ手段にて静電潜像が
形成される。そしてこの静電潜像は磁性トナーに
て現像される。５は前記スリーブ３とある間隙α
を有して支峙された非磁性ブレードで、スリーブ
３とほぼ同じ長さを有する。[Detailed Description of the Invention] The present invention relates to an improvement of a copying machine. A typical structure of a developing device of a conventional copying machine is shown in FIG. First, this conventional example will be explained according to the drawings. Reference numeral 1 denotes an immovable magnet holder in which a plurality of magnets 2 are embedded in the outer periphery. These magnets 2... are arranged around the outer periphery of the magnet holder 1 so that opposite polarities appear alternately. A non-magnetic sleeve 3 is rotatably fitted around the outer periphery of the magnet holder 1, and is biased to rotate counterclockwise in the figure. Reference numeral 4 denotes a photosensitive drum whose circumferential side surface is coated with a photoconductive material, on which an electrostatic latent image is formed by means not shown. This electrostatic latent image is then developed with magnetic toner. 5 is a certain gap α with the sleeve 3
It is a non-magnetic blade supported by a sleeve 3 and has approximately the same length as the sleeve 3.
このような現像装置に磁性トナーを供給し、ス
リーブ３を反時計方向に回転させると、この磁性
トナーは、磁石２……によりスリーブ３の周側に
磁気吸着されつつ、共に回転する。この際、磁性
トナーは各磁石２……間を走る磁力線に沿つて穂
立ちし、非常に厚いトナー層が形成される。 When magnetic toner is supplied to such a developing device and the sleeve 3 is rotated counterclockwise, the magnetic toner is magnetically attracted to the circumferential side of the sleeve 3 by the magnets 2 and rotates therewith. At this time, the magnetic toner stands up along the lines of magnetic force running between the magnets 2, and a very thick toner layer is formed.
しかしながら、トナー層が厚くなると、摩擦帯
電がし難く、充分な現像ができなくなり、また、
前記感光体ドラム４に余計な磁性トナーが付着し
て、いわゆるバツクグランドを汚損する虞れがあ
る。そこで、トナー層を薄くするために、ブレー
ド５が設けられ、磁性トナーの穂切りがなされる
が、ブレード５とスリーブ３との間隙αの寸法を
あまり小さくすると、磁性トナーがブレード５の
上流側でつまる虞れがあつた。それは、磁石２…
…が磁石ホルダ１の外周に、交互に反対極性が現
れるよう配備されているため、磁石ホルダ１の全
周にわたり、磁力線（点線で示す）が走り、ブレ
ード５をどこに位置させても、磁力線を横切るこ
とになるからである。前述のように、磁性トナー
の穂は磁力線に沿つて伸張するものであるから、
磁力線を横切る遮蔽物があると、その部分にてト
ナーが団塊状になり、つまる虞れがある。従つ
て、従来例においてはαの寸法をあまり小さくす
ることができず（１〜２mm程度）、現像が不充分
であつたり、バツクグランドを汚損することがあ
つた。また、上記問題を解決するために、本願出
願人は不動の磁性ホルダーの外周の一部に同極対
向部位が形成され、同極対向部位間の外方に非磁
性ブレードを設けた現像装置を提案した。これに
より、ブレード上流側にて磁性トナーがつまるこ
となく、トナー層を薄くするのに有効であつた。
しかしながら、同極対向部位の上流側において、
磁力により磁性トナーの穂立ちが形成されるた
め、更にトナー層を薄くするとブレード上流側に
て磁性トナーがつまつてしまう虞れがあつた。 However, when the toner layer becomes thick, it becomes difficult to perform triboelectric charging, and sufficient development becomes impossible.
There is a risk that extra magnetic toner may adhere to the photosensitive drum 4 and contaminate the so-called background. Therefore, in order to thin the toner layer, a blade 5 is provided to cut the magnetic toner into spikes. However, if the dimension of the gap α between the blade 5 and the sleeve 3 is made too small, the magnetic toner will be transferred to the upstream side of the blade 5. There was a risk of getting stuck. That is magnet 2...
... are arranged around the outer circumference of the magnet holder 1 so that opposite polarities appear alternately, so lines of magnetic force (indicated by dotted lines) run all around the entire circumference of the magnet holder 1, and no matter where the blade 5 is positioned, the lines of magnetic force are This is because you will have to cross it. As mentioned above, magnetic toner ears extend along the lines of magnetic force, so
If there is a shield that crosses the lines of magnetic force, there is a risk that the toner will form lumps in that area and cause clogging. Therefore, in the conventional example, the dimension α could not be made very small (approximately 1 to 2 mm), resulting in insufficient development or staining of the background. In order to solve the above problem, the applicant has developed a developing device in which a portion of the same polarity is formed on a part of the outer periphery of an immovable magnetic holder, and a non-magnetic blade is provided outside between the portions of the same polarity. Proposed. This was effective in reducing the thickness of the toner layer without causing the magnetic toner to clog upstream of the blade.
However, on the upstream side of the homopolar opposing region,
Since spikes of magnetic toner are formed by the magnetic force, if the toner layer is made even thinner, there is a risk that the magnetic toner will become clogged upstream of the blade.
本考案はかかる従来例の難点に鑑みてなされた
もので、複数本の磁石がほぼ同一円周上に配備さ
れた不動の磁石ホルダの外周に、非磁性スリーブ
が回転自在に装着された複写機の現像装置であつ
て、前記磁石ホルダの外周の一部において同極対
向部位が形成され、この同極対向部位間の遠心位
置に、前記スリーブと少許の間隙を有して非磁性
ブレードが設けられると共に、前記同極対向部位
の上流側に、同極対向部位と隣接する磁石との磁
極間に、不動の磁性部材が前記スリーブの一部を
覆うように設けられたものである。こうすること
により、ブレードとスリーブとの間隙を狭くする
も、磁性トナーがブレードの上流側にてつまるこ
とを防止せんとするものである。 The present invention was devised in view of the drawbacks of the conventional example, and is a copying machine in which a non-magnetic sleeve is rotatably attached to the outer periphery of an immovable magnet holder in which a plurality of magnets are arranged on approximately the same circumference. In the developing device, a portion facing the same polarity is formed in a part of the outer periphery of the magnet holder, and a non-magnetic blade is provided at a centrifugal position between the portion facing the same polarity with a small gap from the sleeve. At the same time, an immovable magnetic member is provided on the upstream side of the homopolar facing portion between the magnetic poles of the homopolar facing portion and an adjacent magnet so as to cover a part of the sleeve. By doing this, although the gap between the blade and the sleeve is narrowed, it is possible to prevent the magnetic toner from clogging upstream of the blade.
以下本考案の一実施例につき、第２図に従がい
説明する。なお、従来例と同一部分には同一図番
を付して説明は省略する。 An embodiment of the present invention will be described below with reference to FIG. It should be noted that the same parts as in the conventional example are given the same drawing numbers and the description thereof will be omitted.
２ａ，２ｂは、磁石ホルダ１の外周の一部に、
同極対向部位が形成されるように埋設された磁石
である。これらの磁石２ａ，２ｂは同極が対向し
ているので、それらの間には磁気的な反発力が生
じ、磁力線の流れはとぎれる。非磁性ブレード５
は、この磁力線の流れのとぎれた部分に設けら
れ、このブレード５とスリーブ３との間隙βは
0.1mm程度に定められる。６は同極対向部位の上
流側に設けられた、断面半月形の磁性部材で、ス
リーブ３の一部を覆うように設けられる。前記磁
性部材６は基体（図示せず）等に固設され、スリ
ーブ３の外側が、この磁性部材６の下側を摺動す
るように構成される。また、前記磁性部材６には
ヒータ７，７が内装される。 2a and 2b are part of the outer periphery of the magnet holder 1,
This is a magnet that is buried so that opposite parts of the same polarity are formed. Since these magnets 2a and 2b have the same poles facing each other, a magnetic repulsive force is generated between them, and the flow of magnetic lines of force is interrupted. Non-magnetic blade 5
is provided at a part where the flow of magnetic lines of force is interrupted, and the gap β between the blade 5 and the sleeve 3 is
It is set at around 0.1mm. Reference numeral 6 denotes a magnetic member having a half-moon shape in cross section, which is provided upstream of the same-polarity opposing portion, and is provided so as to cover a part of the sleeve 3 . The magnetic member 6 is fixed to a base (not shown) or the like, and the outside of the sleeve 3 is configured to slide on the underside of the magnetic member 6. Furthermore, heaters 7, 7 are installed inside the magnetic member 6.
同極対向部位の上流側に磁性部材６が設けられ
ると、前記磁石２ｂから出た磁力線は、全てこの
磁性部材６の内部を通り、より上流側の磁石２ｃ
へと到る。従つて、前記ブレード５と磁性部材６
との間には、磁力線が存在しなく、磁気的に「無
重力」の状態となる。それ故、磁性部材６を乗越
た磁性トナーは穂立ちせず、前記ブレード５にて
薄層にされる。また、前記磁性トナーは、磁性部
材６の上面を乗越る際に、ヒータ７，７にて加熱
乾燥される。 When the magnetic member 6 is provided on the upstream side of the same-polar facing portion, all the lines of magnetic force coming out from the magnet 2b pass through the inside of this magnetic member 6, and the magnetic lines of force coming out from the magnet 2b pass through the inside of the magnet 2c on the more upstream side.
reach. Therefore, the blade 5 and the magnetic member 6
There are no magnetic lines of force between the two, resulting in a magnetically "weightless" state. Therefore, the magnetic toner that has passed over the magnetic member 6 does not stand up, but is formed into a thin layer by the blade 5. Furthermore, when the magnetic toner passes over the upper surface of the magnetic member 6, it is heated and dried by heaters 7, 7.
なお、同極対向部位は、２本の磁石を同極が対
向するように並設されて形成される他に、１本の
幅広の磁石の外側部に、スリーブの回転軸線と平
行な溝を削設することにより形成されてもよい。 In addition, the homopolar opposing portion is formed by arranging two magnets side by side with the same polarity facing each other, or by forming a groove parallel to the rotational axis of the sleeve on the outer side of one wide magnet. It may also be formed by cutting.
叙上のように、本考案によると、非磁性ブレー
ドを磁力線が走らないところに設けると共に、同
極対向部位の上流側に、同極対向部位と隣接する
磁石との磁極間に、不動の磁性部材が前記スリー
ブの一部を覆うように設けられたものであるか
ら、ブレード上流側近傍で磁性トナーの穂立ちが
形成されることなく、ブレードにより磁性トナー
の穂を横切ることはない。従つて、ブレードとス
リーブとの間隙を極端に狭くしても、ブレードの
上流側にて磁性トナーがつまることはなく、トナ
ーの薄層をつくることができる。それ故、磁性ト
ナーを充分に帯電させることができると共に、バ
ツクグランドを汚損する虞れもない。更に、磁性
部材にヒータが埋設された場合には、磁性トナー
が乾燥されるので、常に良好な状態で現像され得
る。 As mentioned above, according to the present invention, a non-magnetic blade is provided in a place where lines of magnetic force do not run, and an immovable magnetic blade is installed between the magnetic poles of the same-polar facing part and an adjacent magnet on the upstream side of the same-polar facing part. Since the member is provided to cover a portion of the sleeve, no spikes of magnetic toner are formed near the upstream side of the blade, and the blade does not cross the spikes of magnetic toner. Therefore, even if the gap between the blade and the sleeve is extremely narrow, the magnetic toner does not get clogged upstream of the blade, and a thin layer of toner can be formed. Therefore, the magnetic toner can be sufficiently charged, and there is no risk of contaminating the background. Furthermore, when the heater is embedded in the magnetic member, the magnetic toner is dried, so that it can always be developed in a good condition.
第１図は従来例を示す模式的断面図、第２図は
本考案の一実施例を示す模式的断面図である。
１……磁石ホルダ、２，２ａ，２ｂ，２ｃ……
磁石、３……非磁性スリーブ、４……感光体ドラ
ム、５……非磁性ブレード、６……磁性部材、７
……ヒータ。
FIG. 1 is a schematic sectional view showing a conventional example, and FIG. 2 is a schematic sectional view showing an embodiment of the present invention. 1... Magnet holder, 2, 2a, 2b, 2c...
Magnet, 3... Non-magnetic sleeve, 4... Photosensitive drum, 5... Non-magnetic blade, 6... Magnetic member, 7
……heater.
Claims (1)
不動の磁石ホルダの外周に、非磁性スリーブが
回転自在に装着された複写機の現像装置であつ
て、前記磁石ホルダの外周の一部において同極
対向部位が形成され、この同極対向部位間の遠
心位置に前記スリーブと少許の間隙を有して非
磁性ブレードが設けられると共に、前記同極対
向部位の上流側に、同極対向部位と隣接する磁
石との磁極間に断面が半月形の不動の磁性部材
が前記スリーブの一部を覆うように設けられた
ことを特徴とする複写機の現像装置。 ２ 磁性部材にヒータが内装された実用新案登録
請求の範囲第１項記載の複写機の現像装置。[Claims for Utility Model Registration] 1. A developing device for a copying machine in which a non-magnetic sleeve is rotatably attached to the outer periphery of an immovable magnet holder in which a plurality of magnets are arranged on substantially the same circumference, A homopolar opposing portion is formed in a part of the outer periphery of the magnet holder, and a non-magnetic blade is provided at a distal position between the homopolar opposing portions with a small gap from the sleeve, and A developing device for a copying machine, characterized in that an immovable magnetic member having a half-moon cross section is provided on the upstream side of the sleeve between the magnetic poles of the same-polar facing portion and the adjacent magnet so as to cover a part of the sleeve. . 2. A developing device for a copying machine according to claim 1, in which a heater is incorporated in a magnetic member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13950981U JPS5845549U (en) | 1981-09-18 | 1981-09-18 | Copy paper developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13950981U JPS5845549U (en) | 1981-09-18 | 1981-09-18 | Copy paper developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5845549U JPS5845549U (en) | 1983-03-26 |
| JPH0132051Y2 true JPH0132051Y2 (en) | 1989-10-02 |
Family
ID=29932696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13950981U Granted JPS5845549U (en) | 1981-09-18 | 1981-09-18 | Copy paper developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5845549U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61147273A (en) * | 1984-12-21 | 1986-07-04 | Konishiroku Photo Ind Co Ltd | Magnetic brush developing device |
| JPS61147274A (en) * | 1984-12-21 | 1986-07-04 | Konishiroku Photo Ind Co Ltd | Magnetic brush developing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53132A (en) * | 1976-06-23 | 1978-01-05 | Ricoh Co Ltd | Magnetic brush developing device |
| JPS55151674A (en) * | 1979-05-17 | 1980-11-26 | Canon Inc | Developing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5930917Y2 (en) * | 1980-01-10 | 1984-09-03 | 株式会社リコー | magnetic brush developing device |
-
1981
- 1981-09-18 JP JP13950981U patent/JPS5845549U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53132A (en) * | 1976-06-23 | 1978-01-05 | Ricoh Co Ltd | Magnetic brush developing device |
| JPS55151674A (en) * | 1979-05-17 | 1980-11-26 | Canon Inc | Developing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5845549U (en) | 1983-03-26 |
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