JPH0525461U - Electrophotographic developing device - Google Patents
Electrophotographic developing deviceInfo
- Publication number
- JPH0525461U JPH0525461U JP3517691U JP3517691U JPH0525461U JP H0525461 U JPH0525461 U JP H0525461U JP 3517691 U JP3517691 U JP 3517691U JP 3517691 U JP3517691 U JP 3517691U JP H0525461 U JPH0525461 U JP H0525461U
- Authority
- JP
- Japan
- Prior art keywords
- developer
- doctor blade
- electrophotographic developing
- developing device
- 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.)
- Pending
Links
- 230000000694 effects Effects 0.000 claims abstract description 10
- 230000004907 flux Effects 0.000 claims abstract description 3
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 230000004927 fusion Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012216 imaging agent Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
(57)【要約】
【構成】 現像剤を搬送するためのマグネットロールと
１現像剤量を規制するためのドクターブレード４を少な
くとも備えた電子写真現像装置において、前記ドクター
ブレード４の形状を、磁極のマグネットの両端近傍部に
対向する両端部に現像剤抑制部４ａ、４ｂを延設した逆
Ｕ字形状としたことを特徴とする電子写真現像装置。
【効果】 磁極の両端部におけるエッジ効果による表面
磁束密度の増大の影響を抑制し、現像剤の融着、こぼ
れ、スリーブとドクターブレード間の昇圧等のトラブル
を防止する。
(57) [Summary] [Construction] In an electrophotographic developing apparatus comprising at least a magnet roll for conveying a developer and a doctor blade 4 for regulating the amount of one developer, the shape of the doctor blade 4 is a magnetic pole. An electrophotographic developing device having an inverted U-shape in which developer suppressing portions 4a and 4b are provided at both end portions of the magnet opposite to both end portions thereof. [Effect] The influence of the increase in the surface magnetic flux density due to the edge effect at both ends of the magnetic pole is suppressed, and troubles such as fusion of the developer, spillage, and pressure increase between the sleeve and the doctor blade are prevented.
Description
【０００１】[0001]
本考案は複写機、プリンター、ファクシミリ等の電子写真現像装置に関し、更 に詳しくは、簡単な構造で所謂エッジ効果による現像剤の融着や、こぼれ等の問 題を解消した電子写真現像装置に関する。 The present invention relates to an electrophotographic developing device such as a copying machine, a printer, and a facsimile, and more specifically, to an electrophotographic developing device having a simple structure and solving the problems such as the fusion of the developer due to the so-called edge effect and the spillage. ..
【０００２】[0002]
電子写真現像装置は現像剤を搬送するためのマグネットロールと、現像剤量を 規制するためのドクターブレードを備え、所定量の現像剤を感光体上の静電潜像 部に付着させる方式のものが広く用いられている。 そして、このような装置に用いられるマグネットロールは、図１に示す如く断 面が多角形のシャフト（１１）の周りに、極数分の焼結マグネット、金属マグネ ットあるいは押出又は射出成形で成形したマグネット（１２ａ）〜（１２ｄ）を 接着し、これに図示していないがスリーブ、フランジ等を取り付け、複写機等の 現像機マグネットロール支持部に取り付け使用される。 The electrophotographic developing device is equipped with a magnet roll to convey the developer and a doctor blade to regulate the amount of the developer, and a predetermined amount of the developer is attached to the electrostatic latent image portion on the photoconductor. Is widely used. As shown in FIG. 1, the magnet roll used in such a device is formed by sintering magnets, metal magnets or extrusion or injection molding for the number of poles around a shaft (11) having a polygonal cross section. The molded magnets (12a) to (12d) are adhered to each other, and although not shown, a sleeve, a flange and the like are attached to the magnets, and the magnets are used by being attached to a magnet roll supporting portion of a developing machine such as a copying machine.
【０００３】 また、最近、図２に示す如く、シャフト（１１）もマグネット（１２）と同材 質で一体成形する方法や、円筒マグネット（１２）を押出成形し、シャフト（１ １）を挿入する方法などが提案されている。Further, recently, as shown in FIG. 2, a method of integrally forming the shaft (11) with the same material as the magnet (12) or a method of extruding a cylindrical magnet (12) and inserting the shaft (11). A method for doing so has been proposed.
【０００４】[0004]
しかし乍ら、このようなマグネットロールにあっては、図３に示す如く、所謂 エッジ効果により両端部の磁力が高くなり、その結果、両端部での現像剤の吸着 力が大きくなる。このため、マグネットロールの両端部における現像剤の搬送量 が多くなり、その結果、スリーブとシール又はドクターブレードとの間の隙間で 圧力が大きくなり、現像剤の融着や、こぼれが避けられない。 本考案はかかる実情に鑑み、上記問題を解消した電子写真現像装置を提供する ことを目的とする。 However, in such a magnet roll, as shown in FIG. 3, the magnetic force at both ends increases due to the so-called edge effect, and as a result, the attraction force of the developer at both ends increases. For this reason, the amount of developer conveyed at both ends of the magnet roll increases, and as a result, the pressure increases in the gap between the sleeve and the seal or the doctor blade, and the developer is unavoidably fused and spilled. .. The present invention has been made in view of the above circumstances, and an object thereof is to provide an electrophotographic developing apparatus which solves the above problems.
【０００５】[0005]
即ち、本考案は現像剤を搬送するためのマグネットロールと現像剤量を規制す るためのドクターブレードを少なくとも備えた電子写真現像装置において、前記 ドクターブレードの形状を、磁極のマグネットの両端近傍部に対向する両端部に 現像剤抑制部を延設した逆Ｕ字形状とすることにより、前記磁極の両端部におけ るエッジ効果による表面磁束密度の増大の影響を抑制したことを特徴とする電子 写真現像装置を内容とするものである。 That is, the present invention is an electrophotographic developing apparatus having at least a magnet roll for conveying a developer and a doctor blade for regulating the amount of the developer. Electron characterized by suppressing the influence of the increase in the surface magnetic flux density due to the edge effect at both ends of the magnetic pole by forming the developer suppressing portion at both ends facing each other to have an inverted U shape. The content is a photographic developing device.
【０００６】[0006]
本考案を図面に基づいて説明する。 図４は、本考案の実施態様を示すマグネットロールとドクターブレード付近の 要部概略図、及び磁気パターン（Ａ）と現像剤搬送量（Ｂ）を示す模式図である 。 同図において、マグネットロール（１）はシャフト（２）とその周囲に配設さ れたマグネット（３）とからなり、一方、ドクターブレード（４）は両端部に現 像剤抑制部（４ａ）、（４ｂ）を延設した逆Ｕ字状からなり、マグネット（３） の両端部の、現像剤の搬送量をドクターブレードの現像剤抑制部（４ａ）、（４ ｂ）でコントロールする構造である。 現像剤抑制部（４ａ）、（４ｂ）は、その押圧力により現像剤の量を制御する ものであり、従って、エッジ効果による現像剤搬送量の増大の程度により長さ、 巾、厚さ等が適宜決定される。 The present invention will be described with reference to the drawings. FIG. 4 is a schematic view of a main part around a magnet roll and a doctor blade showing an embodiment of the present invention, and a schematic view showing a magnetic pattern (A) and a developer conveyance amount (B). In the figure, a magnet roll (1) is composed of a shaft (2) and a magnet (3) arranged around the shaft, while a doctor blade (4) has an imaging agent suppressor (4a) at both ends. , (4b) are extended to form an inverted U shape, and the amount of developer conveyed at both ends of the magnet (3) is controlled by the developer suppressing portions (4a) and (4b) of the doctor blade. is there. The developer restraining sections (4a) and (4b) control the amount of the developer by the pressing force thereof, and therefore, the length, width, thickness, etc. are controlled depending on the degree of increase of the developer carrying amount due to the edge effect. Is appropriately determined.
【０００７】 ドクターブレードは一体成形や後加工により上記の如き逆Ｕ字状としてもよく 、また通常のドクターブレードの両端に現像剤抑制部（４ａ）、（４ｂ）を接着 、溶着、機械的手段等の取り付け手段により取り付けてもよい。 上記の如き構成とすることにより、エッジ効果による両端部の現像剤の搬送量 増大が制御され、（Ｂ）に示す如く、マグネットの全長に亘って均一な搬送量が 達成される。The doctor blade may be formed into an inverted U shape as described above by integral molding or post-processing, and the developer suppressing portions (4a) and (4b) may be adhered, welded, or mechanically attached to both ends of a normal doctor blade. You may attach by attachment means, such as. With the above-described structure, the increase in the amount of developer conveyed at both ends due to the edge effect is controlled, and as shown in FIG. 6B, a uniform amount of developer is achieved over the entire length of the magnet.
【０００８】[0008]
叙上の通り、本考案によれば、簡単な構造により、エッジ効果に起因する現像 剤の融着、こぼれ、スリーブとドクターブレード間の昇圧等のトラブルを防止し た電子写真現像装置を提供することができる。 As described above, according to the present invention, an electrophotographic developing device having a simple structure and preventing problems such as fusion of the developer, spillage, and pressure increase between the sleeve and the doctor blade due to the edge effect is provided. be able to.
【図１】マグネットロールを示す概要図である。FIG. 1 is a schematic view showing a magnet roll.
【図２】マグネットロールを示す概要図である。FIG. 2 is a schematic view showing a magnet roll.
【図３】マグネットロールの磁気パターンの概念図であ
る。FIG. 3 is a conceptual diagram of a magnetic pattern of a magnet roll.
【図４】本考案の実施態様を示すマグネットロールとド
クターブレード付近の要部概略図、及び磁気パターン
（Ａ）と現像剤搬送量（Ｂ）の模式図である。FIG. 4 is a schematic view of a main part around a magnet roll and a doctor blade showing an embodiment of the present invention, and a schematic view of a magnetic pattern (A) and a developer conveyance amount (B).
１ マグネットロール ２ シャフト ３ マグネット ４ ドクターブレード ４ａ、４ｂ ドクターブレードの現像剤抑制部 １１ シャフト １２、１２ａ〜１２ｄ マグネット DESCRIPTION OF SYMBOLS 1 magnet roll 2 shaft 3 magnet 4 doctor blade 4a, 4b developer suppressing portion of doctor blade 11 shaft 12, 12a to 12d magnet
Claims (1)
ルと現像剤量を規制するためのドクターブレードを少な
くとも備えた電子写真現像装置において、前記ドクター
ブレードの形状を、磁極のマグネットの両端近傍部に対
向する両端部に現像剤抑制部を延設した逆Ｕ字形状とす
ることにより、前記磁極の両端部におけるエッジ効果に
よる表面磁束密度の増大の影響を抑制したことを特徴と
する電子写真現像装置。1. An electrophotographic developing device comprising at least a magnet roll for conveying a developer and a doctor blade for regulating the amount of the developer, wherein the doctor blade has a shape in the vicinity of both ends of a magnet of a magnetic pole. An electrophotographic developing device characterized in that the influence of the increase of the surface magnetic flux density due to the edge effect at both ends of the magnetic pole is suppressed by forming the developer suppressing portions at opposite ends so as to have an inverted U shape. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3517691U JPH0525461U (en) | 1991-04-17 | 1991-04-17 | Electrophotographic developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3517691U JPH0525461U (en) | 1991-04-17 | 1991-04-17 | Electrophotographic developing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0525461U true JPH0525461U (en) | 1993-04-02 |
Family
ID=12434548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3517691U Pending JPH0525461U (en) | 1991-04-17 | 1991-04-17 | Electrophotographic developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0525461U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9044084B2 (en) | 2006-05-31 | 2015-06-02 | Mark C. Carter | Modular folding table |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0225878A (en) * | 1988-07-15 | 1990-01-29 | Canon Inc | developing device |
-
1991
- 1991-04-17 JP JP3517691U patent/JPH0525461U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0225878A (en) * | 1988-07-15 | 1990-01-29 | Canon Inc | developing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9044084B2 (en) | 2006-05-31 | 2015-06-02 | Mark C. Carter | Modular folding table |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19970311 |