JPH0462391B2 - - Google Patents
Info
- Publication number
- JPH0462391B2 JPH0462391B2 JP58094096A JP9409683A JPH0462391B2 JP H0462391 B2 JPH0462391 B2 JP H0462391B2 JP 58094096 A JP58094096 A JP 58094096A JP 9409683 A JP9409683 A JP 9409683A JP H0462391 B2 JPH0462391 B2 JP H0462391B2
- Authority
- JP
- Japan
- Prior art keywords
- toner
- sleeve
- circumferential surface
- blade
- layer
- 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
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method 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
- G03G15/0896—Arrangements or disposition of the complete developer unit or parts thereof not provided for by groups G03G15/08 - G03G15/0894
- G03G15/0898—Arrangements or disposition of the complete developer unit or parts thereof not provided for by groups G03G15/08 - G03G15/0894 for preventing toner scattering during operation, e.g. seals
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Description
【発明の詳細な説明】
技術分野
本発明は、1成分現像剤を用いる現像装置に関
し、より詳細には、電子写真被写機等の静電潜像
を利用した画像形成装置に好適な現像装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a developing device using a one-component developer, and more particularly to a developing device suitable for an image forming device using an electrostatic latent image such as an electrophotographic camera. It is related to.
従来技術
一般に、電子写真複写機等の1成分現像剤を用
いた現像方法に於いては、現像剤としてのトナー
を均一に薄層化し必要な電荷を付与して現像に供
する必要がある。その具体的な手段として、弾性
ブレードや磁性体からなる層厚規制部材を回転さ
れるトナー担持体の幅方向略全域に摺接させてト
ナーの層厚を規制し、トナー薄層を得ると同時に
このときの摩擦帯電により現像の際に必要な電荷
をトナーに付与する方法が良く知られている。こ
の場合、非画像領域に対応する場合が多いトナー
担持体周面の両端部に於いては、トナーが消費さ
れないのに加え、トナー担持体等の回転と共にそ
の拡散作用等によりトナーが移動してくる傾向に
あり、その為トナーが供給過多となつて飛散し機
内が汚染される等の不都合が生じる。PRIOR ART In general, in a developing method using a one-component developer such as in an electrophotographic copying machine, it is necessary to uniformly form a thin layer of toner as a developer and apply a necessary charge to the toner for development. As a specific means, a layer thickness regulating member made of an elastic blade or a magnetic material is brought into sliding contact with almost the entire width direction of the rotating toner carrier to regulate the toner layer thickness, thereby simultaneously obtaining a thin toner layer. A well-known method is to apply the necessary charge to the toner during development using frictional charging at this time. In this case, in addition to the toner not being consumed at both ends of the circumferential surface of the toner carrier, which often correspond to non-image areas, the toner moves due to its diffusion effect as the toner carrier rotates. This causes inconveniences such as oversupply of toner and scattering of toner, contaminating the inside of the machine.
これらの不都合を防止する為、従来の現像装置
に於いては、トナーが供給過多となりやすい層厚
規制部材の両側部とトナー担持体との間に可撓性
を備えたシール部材を設け、選択的にこの部分で
のトナー薄層の形成を阻止しトナーの供給過多を
防止している。然るに、この方法では、層厚規制
部材が弾性を有している場合はシール部材を設け
る事により変形して摺接部の層厚規制力が不均一
となり、特に、1端を回動自在に支承された弾性
ブレードによる場合等は、シール部材近傍の規制
力が弱くなる為この部分にトナーが過剰に供給さ
れる事が多い。 In order to prevent these inconveniences, in conventional developing devices, flexible sealing members are provided between both sides of the layer thickness regulating member and the toner carrier, where toner tends to be oversupplied. This effectively prevents the formation of a thin layer of toner in this area, thereby preventing oversupply of toner. However, in this method, if the layer thickness regulating member has elasticity, the provision of the sealing member deforms and the layer thickness regulating force at the sliding contact portion becomes uneven. When a supported elastic blade is used, the regulating force near the sealing member is weak, so toner is often supplied excessively to this area.
目 的
本発明は以上の点に鑑みてなされたものであつ
て、簡単な構造でトナーの供給過多が防止され過
剰供給トナーによる機内の汚染が回避されると共
にトナーの有効利用を促進可能な現像装置を提供
する事を目的とする。Purpose The present invention has been made in view of the above points, and is a developing device that has a simple structure, prevents oversupply of toner, avoids contamination inside the machine due to oversupplied toner, and promotes effective use of toner. The purpose is to provide equipment.
構 成
以下、本発明の構成について具体的な実施例に
基づき説明する。第1図は電子写真複写機に適用
された本発明の現像装置を示した模式図で、第2
図はその要部を示した斜視図、第3図はその平面
図である。第1図に於いて、円筒状のトナー担持
体としてのスリーブ2が回転自在に支承されてお
り、矢印方向に所定の速度で回転駆動され、トナ
ー1をその周面に担持して搬送する。スリーブ2
の内部には円柱状磁石3がスリーブ2と同軸的に
回転自在に配設されており、本例ではスリーブ2
の回転方向と同方向に回転される。尚、スリーブ
2と磁石3の回転方向は目的に応じて任意に選択
する事が可能であり、又、何れか一方を非回転状
態に固設する事も可能である。尚、夫々の回転速
度としては、例えばスリーブ2の400r.p.mに対し
て磁石3の回転速度を1800r.p.m程度に設定する
のが好適である。Configuration The configuration of the present invention will be described below based on specific examples. FIG. 1 is a schematic diagram showing the developing device of the present invention applied to an electrophotographic copying machine, and FIG.
The figure is a perspective view showing the main parts, and FIG. 3 is a plan view thereof. In FIG. 1, a sleeve 2 as a cylindrical toner carrier is rotatably supported, and is rotated at a predetermined speed in the direction of the arrow to carry and convey toner 1 on its circumferential surface. sleeve 2
A cylindrical magnet 3 is disposed coaxially and rotatably with the sleeve 2, and in this example, the sleeve 2
is rotated in the same direction as the direction of rotation. Note that the rotation directions of the sleeve 2 and the magnet 3 can be arbitrarily selected depending on the purpose, and it is also possible to fix one of them in a non-rotating state. As for the respective rotational speeds, it is preferable to set the rotational speed of the magnet 3 to about 1800rpm, for example, while the sleeve 2 has a rotational speed of 400rpm.
スリーブ2の周面近傍の所定領域に亘り、磁性
トナー1を貯留しスリーブ2の周面に適量ずつ補
給するホツパ4が配設されている。磁性トナー1
は樹脂中に磁性粉を混合させた所謂1成分高抵抗
磁性トナーであり平均粒径が約6μmに調節されて
いる。 A hopper 4 is disposed over a predetermined area near the circumferential surface of the sleeve 2 for storing the magnetic toner 1 and replenishing the circumferential surface of the sleeve 2 in an appropriate amount. magnetic toner 1
is a so-called one-component high-resistance magnetic toner in which magnetic powder is mixed in resin, and the average particle size is adjusted to about 6 μm.
ホツパ4のスリーブ2の回転方向に於ける下流
側には、例えば厚みが0.1mm程度のSK材等の弾性
を十分に有する磁性体からなるブレード5が配設
されている。このブレード5は、第3図に示され
る如く、スリーブ2の幅方向の略全域に於いてス
リーブ2と摺接する様に設けられており、ホツパ
4からスリーブ2の周面に供給され搬送されてく
るトナー1の量を規制しトナー薄層1aを形成す
る。ブレード5は、1端を軸5aの周りに回動自
在に支承され、自由端の他端側がスリーブ2に内
設された磁石3の磁力による適度な安定した押圧
力によりスリーブ周面を一様に押圧する様に設け
られており、これにより形成されるトナー薄層1
aの層厚が安定化する。 On the downstream side of the hopper 4 in the direction of rotation of the sleeve 2, a blade 5 made of a sufficiently elastic magnetic material such as SK material having a thickness of about 0.1 mm is disposed. As shown in FIG. 3, this blade 5 is provided so as to be in sliding contact with the sleeve 2 over almost the entire widthwise area of the sleeve 2, and is supplied to the circumferential surface of the sleeve 2 from the hopper 4 and conveyed. The amount of toner 1 is regulated to form a thin toner layer 1a. The blade 5 has one end rotatably supported around a shaft 5a, and the other free end of the blade 5 which uniformly applies a moderate and stable pressing force to the sleeve circumferential surface due to the magnetic force of a magnet 3 installed inside the sleeve 2. The toner thin layer 1 formed by this is provided so as to be pressed against the
The layer thickness of a is stabilized.
而して、ブレード5の自由端の両側部には、ス
リーブ2周面の両端部へのトナーの供給過多を防
止する1対のシール部材6が配設されている。こ
のシール部材6は、例えばモルトプレーン等の可
撓性を備えた材料からなり、第3図に示される如
く、ブレード5の自由先端両側部及びその周辺の
スリーブ2周面の領域に略密接する様に当接し、
この領域へのトナー1の接触を阻止してその供給
過多を防止している。この場合、シール部材6は
可撓性を有している為、ブレード5の厚みによる
段差にも柔軟に追従して所望の密接状態を容易に
得る事ができる。本例に於いては、シール部材6
が1端をホツパ4底部に固定され先端がブレード
5の自由先端位置より高くなる様に立設させてい
る。又、第3図に示される如く、1対のシール部
材6,6の離隔距離Lをスリーブ2周面の有効画
像領域Wと略一致させる事により、余分なトナー
の供給が一層効率良く防止される。かくの如くシ
ール部材6を構成する事により、非画像領域や外
部へのトナーの供給が効果的に防止されると共
に、その可撓性によりブレード5先端のスリーブ
2周面に近離する自由な動作が拘束される不都合
も回避される。尚、シール部材6は、第4図に示
される如く、例えばマイラ等の比較的薄い部材を
用いて構成する事も可能である。 A pair of seal members 6 are disposed on both sides of the free end of the blade 5 to prevent excessive supply of toner to both ends of the circumferential surface of the sleeve 2. The sealing member 6 is made of a flexible material such as Moltoprene, and is in close contact with both sides of the free tip of the blade 5 and the surrounding area of the sleeve 2, as shown in FIG. contact,
The toner 1 is prevented from coming into contact with this region to prevent its oversupply. In this case, since the sealing member 6 is flexible, it can flexibly follow the step difference due to the thickness of the blade 5 and easily obtain the desired close contact state. In this example, the seal member 6
is fixed at one end to the bottom of the hopper 4, and is erected so that its tip is higher than the free tip position of the blade 5. Furthermore, as shown in FIG. 3, by making the separation distance L between the pair of seal members 6, 6 approximately coincide with the effective image area W on the circumferential surface of the sleeve 2, the supply of excess toner can be more efficiently prevented. Ru. By configuring the sealing member 6 in this way, toner is effectively prevented from being supplied to the non-image area or outside, and its flexibility allows it to freely approach the circumferential surface of the sleeve 2 at the tip of the blade 5. The inconvenience of restricted movement is also avoided. Incidentally, as shown in FIG. 4, the sealing member 6 can also be constructed using a relatively thin member such as Mylar.
第1図に戻つて、スリーブ2の周面に於ける上
述のブレード5の配設位置の下流側で、例えば本
例の如くブレード5と略反対側の位置には、矢印
の方向に回動される無端状のOPCベルト(有機
性感光体ベルト)7が配設されており、この表面
に回転駆動されるスリーブ2が転動接触し、スリ
ーブ2周面に薄層化して担持されているトナー1
aがOPCベルト7表面に供給される。OPCベル
ト7は、矢印の方向に定速駆動される間にその表
面に所定の極性で一様帯電が成され、像露光が成
されて静電潜像が形成された後、本発明の現像装
置の配設位置に到達し、ここで上記トナー薄層1
aの供給を受けて静電潜像が可視像化される。 Returning to FIG. 1, on the downstream side of the above-described placement position of the blade 5 on the circumferential surface of the sleeve 2, for example, in a position substantially opposite to the blade 5 as in this example, there is a position that is rotated in the direction of the arrow. An endless OPC belt (organic photoreceptor belt) 7 is disposed, and a rotationally driven sleeve 2 is in rolling contact with the surface of the OPC belt 7, and is supported in a thin layer on the circumferential surface of the sleeve 2. Toner 1
a is supplied to the surface of the OPC belt 7. While the OPC belt 7 is driven at a constant speed in the direction of the arrow, its surface is uniformly charged with a predetermined polarity, imagewise exposed, and an electrostatic latent image is formed. The installation position of the device is reached, where the toner thin layer 1
The electrostatic latent image is turned into a visible image by being supplied with a.
次に、斯かる構成を有する上記実施例の動作に
ついて説明する。 Next, the operation of the above embodiment having such a configuration will be explained.
所定の速度で矢印の方向に回転するスリーブ2
の表面に、ホツパ4から磁性トナー1が適量ずつ
供給される。この場合、ホツパ4内に設けられた
アジテータ(不図示)やスリーブ2に内設された
磁石3の磁力により、ホツパ4内のトナー1がス
リーブ2周面に向けて移動するが、ブレード5の
両側部とその近傍のスリーブ2周面両端部にはシ
ール部材6が当接しトナー1とスリーブ2周面の
接触が防止されている。従つて、トナー1は磁石
3等の回転と共にスリーブ2の軸方向に拡散する
傾向にあるが、このシール部材6によつて阻止さ
れ、この領域へのトナー1の過剰供給が回避され
る。 Sleeve 2 rotates in the direction of the arrow at a predetermined speed
An appropriate amount of magnetic toner 1 is supplied from the hopper 4 onto the surface of the toner. In this case, the toner 1 in the hopper 4 moves toward the circumferential surface of the sleeve 2 due to the magnetic force of the agitator (not shown) provided in the hopper 4 and the magnet 3 provided in the sleeve 2. Seal members 6 are in contact with both sides and both ends of the circumferential surface of the sleeve 2 in the vicinity thereof to prevent the toner 1 from coming into contact with the circumferential surface of the sleeve 2. Therefore, the toner 1 tends to spread in the axial direction of the sleeve 2 as the magnet 3 and the like rotate, but this is prevented by the seal member 6, and excessive supply of the toner 1 to this region is avoided.
この様にして、スリーブ2周面の有効画像領域
幅W内に選択的に供給されたトナー1は、スリー
ブ2の回転と共にブレード5によりその層厚が規
制され、上記領域内にトナー薄層1aが形成され
る。この際、トナー1が所定の極性の例えば正に
摩擦帯電され現像に必要な電荷が付与される。こ
の場合、前述した如く、シール部材6は可撓性を
備えている為ブレード5の自由端側の層厚規制動
作を制約せず、所定の層厚のトナー薄層1aを安
定して形成する事ができる。 In this way, the toner 1 selectively supplied within the effective image area width W on the circumferential surface of the sleeve 2 has its layer thickness regulated by the blade 5 as the sleeve 2 rotates, and a thin toner layer 1a is formed within the area. is formed. At this time, the toner 1 is triboelectrically charged to a predetermined polarity, for example, positive, and is given the charge necessary for development. In this case, as described above, since the sealing member 6 is flexible, it does not restrict the layer thickness regulating operation on the free end side of the blade 5, and stably forms the thin toner layer 1a with a predetermined thickness. I can do things.
現像に必要な電荷が付与されると共に均一に薄
層化されたトナー薄層1aは、スリーブ2の回転
と共にOPCベルト7と転接する現像位置に搬送
されてくる。OPCベルト7の表面には適所で一
様帯電、像露光の各工程を経て静電潜像が形成さ
れており、これにトナ薄層1aが供給され静電潜
像が可視像化される。この場合、スリーブ2周面
の非画像領域に担当する両端部にはトナー薄層1
aが担持されていない為、現像に供されない過剰
供給されたトナーが飛散し機内が汚染される不都
合が防止される。 The toner thin layer 1a, which is charged with the charge necessary for development and is uniformly thinned, is conveyed to the development position where it rolls into contact with the OPC belt 7 as the sleeve 2 rotates. An electrostatic latent image is formed on the surface of the OPC belt 7 through uniform charging and image exposure processes at appropriate locations, and a thin toner layer 1a is supplied to this to make the electrostatic latent image visible. . In this case, a thin toner layer 1 is placed on both ends of the circumferential surface of the sleeve 2 corresponding to the non-image area.
Since the toner a is not supported, the inconvenience that excessively supplied toner that is not used for development scatters and contaminates the inside of the machine can be prevented.
上記の現像工程を終えたスリーブ2の周面は、
その回転と共に下流側に配設された除電ブラシ
(不図示)等により除電された後、再びホツパ4
の配設位置に戻り、次サイクルの同様な現像プロ
セスが開始される。 The circumferential surface of the sleeve 2 after the above development process is
As the hopper rotates, the static electricity is eliminated by a static elimination brush (not shown) etc. disposed on the downstream side, and then the hopper 4
, and a similar development process for the next cycle is started.
効 果
以上詳述した如く、本発明によれば、所定の領
域の層厚規制部材先端部とその近傍のトナー担持
体表面を可撓性を備えたシール部材で覆う事によ
り、層厚規制動作に悪影響を及ぼす事なくトナー
担持体への不要なトナーの過剰供給が抑制され
る。従つて、過剰供給されたトナーの飛散が回避
され機内の汚染が防止されると共にトナーの歩留
りが向上される。尚、本発明は上記の特定の実施
例に限定されるべきものではなく、本発明の技術
的範囲に於いて種々の変形が可能である事は勿論
である。Effects As detailed above, according to the present invention, by covering the tip of the layer thickness regulating member in a predetermined region and the surface of the toner carrier in the vicinity with a flexible sealing member, the layer thickness regulating operation can be improved. Unnecessary excessive supply of toner to the toner carrier is suppressed without adversely affecting the toner carrier. Therefore, scattering of excessively supplied toner is avoided, contamination inside the machine is prevented, and toner yield is improved. It should be noted that the present invention is not limited to the specific embodiments described above, and it goes without saying that various modifications can be made within the technical scope of the present invention.
第1図は本発明の1実施例を示した模式図、第
2図は本発明の1実施例の要部を示した斜視図、
第3図は本発明の1実施例の要部を示した平面
図、第4図は本発明の他の実施例を示した模式図
である。
符号の説明、2……スリーブ、4……ホツパ、
5……ブレード、6……シール部材。
FIG. 1 is a schematic diagram showing one embodiment of the present invention, FIG. 2 is a perspective view showing essential parts of one embodiment of the present invention,
FIG. 3 is a plan view showing essential parts of one embodiment of the present invention, and FIG. 4 is a schematic diagram showing another embodiment of the present invention. Explanation of symbols, 2...Sleeve, 4...Hoppa,
5...Blade, 6...Seal member.
Claims (1)
給して現像を行なう現像装置に於いて、トナーを
現像位置に移動させるトナー担持体と、先端部表
面を前記トナー担持体と摺接させ所定の層厚のト
ナー層を前記トナー担持体上に形成する層厚規制
部材と、前記層厚規制部材の先端部両側縁を前記
先端部の裏面側から被覆する弾性シール部材とを
有する事を特徴とする現像装置。1. In a developing device that performs development by supplying a thin layer of toner to an electrostatic latent image on an image carrier, a toner carrier that moves the toner to a development position and a tip surface that slides with the toner carrier are used. a layer thickness regulating member that contacts to form a toner layer of a predetermined thickness on the toner carrier; and an elastic sealing member that covers both sides of the tip of the layer thickness regulating member from the back side of the tip. A developing device characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58094096A JPS59219764A (en) | 1983-05-30 | 1983-05-30 | Developing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58094096A JPS59219764A (en) | 1983-05-30 | 1983-05-30 | Developing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS59219764A JPS59219764A (en) | 1984-12-11 |
JPH0462391B2 true JPH0462391B2 (en) | 1992-10-06 |
Family
ID=14100915
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58094096A Granted JPS59219764A (en) | 1983-05-30 | 1983-05-30 | Developing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59219764A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0746248B2 (en) * | 1984-09-28 | 1995-05-17 | 株式会社東芝 | Development device |
JPH02264983A (en) * | 1989-04-06 | 1990-10-29 | Fujitsu Ltd | Developing device |
JP3558276B2 (en) | 2000-01-26 | 2004-08-25 | シャープ株式会社 | Developing device |
-
1983
- 1983-05-30 JP JP58094096A patent/JPS59219764A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS59219764A (en) | 1984-12-11 |
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