JPH0750761Y2 - Development device - Google Patents
Development deviceInfo
- Publication number
- JPH0750761Y2 JPH0750761Y2 JP14271889U JP14271889U JPH0750761Y2 JP H0750761 Y2 JPH0750761 Y2 JP H0750761Y2 JP 14271889 U JP14271889 U JP 14271889U JP 14271889 U JP14271889 U JP 14271889U JP H0750761 Y2 JPH0750761 Y2 JP H0750761Y2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- development
- transport body
- developing roller
- latent image
- 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
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- Dry Development In Electrophotography (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 本考案は、静電記録装置の非磁性１成分現像剤を使用す
る現像装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device using a non-magnetic one-component developer for an electrostatic recording device.
従来技術 電子写真複写機、静電プリンタ、ファクシミリ等の静電
記録装置の現像装置としては、非磁性１成分現像剤を使
用する現像装置が広く採用されている。非磁性１成分現
像剤では、現像剤ホッパに貯溜される現像剤は、潜像担
持体としての感光体に接して回転する現像ローラに供給
され薄層化部材（ドクターブレード）により薄層化され
て感光体と接する現像領域に搬送されて、感光体上の静
電潜像に静電的に吸着されて静電潜像を可視像化する。2. Description of the Related Art As a developing device for an electrostatic recording device such as an electrophotographic copying machine, an electrostatic printer, a facsimile, etc., a developing device using a non-magnetic one-component developer is widely adopted. In the non-magnetic one-component developer, the developer stored in the developer hopper is supplied to a developing roller which rotates in contact with a photosensitive member as a latent image carrier, and is thinned by a thinning member (doctor blade). And is conveyed to a developing area in contact with the photoconductor, and electrostatically attracted to the electrostatic latent image on the photoconductor to visualize the electrostatic latent image.
ところで、現像ローラの周面に現像剤ホッパから現像剤
を供給する場合、ホッパの底部から直接現像ローラに現
像剤を供給するよりも、例えば特開昭61-42672号公報に
開示されている如く、現像ローラの周面に接触して回転
する供給ローラを介して供給する方が均一に安定して現
像剤を供給することができることが知られている。By the way, in the case of supplying the developer from the developer hopper to the peripheral surface of the developing roller, as disclosed in, for example, JP-A-61-42672, rather than supplying the developer directly to the developing roller from the bottom of the hopper. It is known that it is possible to uniformly and stably supply the developer by supplying the developer via a supply roller that rotates in contact with the peripheral surface of the developing roller.
又、現像ローラにより該ローラが感光体に接する現像領
域に搬送された現像剤は、常にすべてが現像によって消
費されるとは限らず、消費されなかった現像剤は現像ロ
ーラ上に付着して残留し、経時的に熱及び振動を受け
て、現像ローラ上にフィルミングが発生し、画像品質の
劣化を招く結果となる。Further, not all of the developer conveyed by the developing roller to the developing area where the roller is in contact with the photoconductor is always consumed by the development, and the unconsumed developer adheres and remains on the developing roller. However, due to heat and vibration over time, filming occurs on the developing roller, resulting in deterioration of image quality.
そこで、現像後現像ローラ上に現像剤が付着して残らな
いようにする手段として、例えば、特開昭53-35550号公
報には現像ローラへの現像剤供給部の直後の位置で現像
ローラに接離可能に現像剤除去ローラを設け、現像中は
これを現像ローラから離間させて、現像剤を供給部から
現像領域に搬送させて現像を行ない、現像完了後現像ロ
ーラの一定回転以上、現像剤除去ローラを現像ローラに
接触させて現像ローラ上の現像剤を除去するようにした
手段が示されている。Therefore, as means for preventing the developer from adhering and remaining on the developing roller after development, for example, in Japanese Patent Laid-Open No. 53-35550, a developing roller is provided at a position immediately after a developer supplying portion to the developing roller. A developer removing roller is provided so that it can come into contact with and separate from it.During development, this is separated from the developing roller, and the developer is conveyed from the supply section to the developing area for development. There is shown means for contacting the developer removal roller with the development roller to remove the developer on the development roller.
しかし、現像ローラに接して現像剤供給ローラと、現像
剤除去ローラの２つを設けることは装置が大型化し、ひ
いては記録装置本体の寸法も大型化し、あるいは配置が
むつかしくなる等の問題点がある。However, providing the developer supply roller and the developer removing roller in contact with the developing roller increases the size of the apparatus, which in turn increases the size of the main body of the recording apparatus or makes the arrangement difficult. .
考案が解決しようとする課題 本考案は、従来の１成分現像装置の上記の実情にかんが
み、現像ローラへの現像剤の供給が均一かつ安定的に行
なわれ、現像ローラ上に現像剤が残留することに起因す
るトナーフィルミングによる画像劣化がなく、かつ、現
像装置の大型化をもたらすことのない現像装置を提供す
ることを課題とする。DISCLOSURE OF THE INVENTION In view of the above situation of the conventional one-component developing device, the present invention allows the developer to be uniformly and stably supplied to the developing roller, and the developer remains on the developing roller. An object of the present invention is to provide a developing device that does not cause image deterioration due to toner filming and that does not cause the developing device to increase in size.
課題解決のための手段 上記の課題を解決させる手段として、こゝに２つの考案
を提案する。Means for Solving the Problems Two means are proposed as means for solving the above problems.
第１の考案は、上記の現像剤搬送体周面に接し現像剤貯
溜部中に設けられ、現像時には上記現像剤貯溜部中に貯
溜された現像剤を現像剤搬送体周面に供給する方向に回
転し、現像完了時には上記現像剤搬送体が少くとも１回
転する間停止させて回転する現像剤搬送体上の現像剤を
除去する現像剤供給兼除去部材を有することを特徴とす
る。According to a first aspect of the present invention, a direction in which the developer stored in the developer reservoir is in contact with the peripheral surface of the developer carrier, and the developer stored in the developer reservoir is supplied to the peripheral surface of the developer carrier during development. It has a developer supply / removal member for rotating the developer carrier and stopping the developer carrier for at least one revolution when the development is completed to remove the developer on the rotating developer carrier.
第２の考案は、上記の現像剤搬送体周面に接し現像剤貯
溜部中に設けられ、現像時には現像剤を現像剤搬送体に
供給するに適するバイアス電圧が印加され、現像完了後
現像剤搬送体が少くとも１回転する間は、現像剤搬送体
上の現像剤を剥離するに適する上記と異るバイアス電圧
が印加される現像剤供給兼除去部材を有することを特徴
とす。A second invention is provided in the developer storage portion in contact with the peripheral surface of the developer transport body, and a bias voltage suitable for supplying the developer to the developer transport body is applied at the time of development, and the developer after the development is completed. It is characterized by having a developer supply / removal member to which a bias voltage different from the above is applied, which is suitable for peeling off the developer on the developer transport body while the transport body makes at least one revolution.
作用 第１の考案の構成によれば、現像時には現像剤供給兼除
去部材が回転して現像剤貯溜部に貯溜される現像剤は均
一に安定して現像剤搬送体周面に供給されるので安定し
た現像が行なわれる。Operation According to the structure of the first invention, the developer supply / removal member rotates during development, and the developer stored in the developer storage portion is uniformly and stably supplied to the peripheral surface of the developer transport body. Stable development is performed.
又、現像完了時には、現像剤搬送体が少くとも１回転す
る間、現像剤供給兼除去部材は停止させた状態で回転す
る現像剤搬送体に接触させた状態に保たれるので、現像
剤搬送体周面に現像剤が供給されることはなく、現像剤
搬送体周面に付着した現像剤は完全に除去され、フィル
ミングの発生ひいてはこれに起因する画像の劣化を防止
することができる。When the development is completed, the developer supply / removal member is kept in contact with the rotating developer transport body while the developer transport body makes at least one revolution, so that the developer transport The developer is not supplied to the peripheral surface of the body, and the developer adhering to the peripheral surface of the developer carrying body is completely removed, so that the occurrence of filming and the resulting deterioration of the image can be prevented.
さらに、現像剤の現像ローラへの供給と除去とを単一の
部材で兼用したので、装置を小型化することができると
ともにコストの低減にも寄与する。Furthermore, since a single member serves both to supply and remove the developer to the developing roller, the device can be downsized and the cost can be reduced.
第２の考案の構成によれば、現像時には、現像剤供給兼
除去部材には現像剤供給に適するバイアス電圧が印加さ
れるので、現像剤貯溜部に貯溜される現像剤は均一に安
定して現像剤搬送体に供給され安定した現像が行なわれ
る。又、現像完了時には、現像剤搬送体が少くとも１回
転し、その間現像剤供給兼除去部材に現像剤除去に適す
るバイアス電圧が印加されるので、現像剤搬送部材に現
像剤が供給されることはなく、現像剤搬送部材上の現像
剤は完全に除去され、フィルミングの発生は防止され
る。According to the structure of the second invention, since the bias voltage suitable for the developer supply is applied to the developer supply / removal member at the time of development, the developer stored in the developer storage portion is uniformly and stably. The developer is supplied to the developer carrier and stable development is performed. At the completion of development, the developer transport body makes at least one revolution, and a bias voltage suitable for removing the developer is applied to the developer supply / removal member during that time, so that the developer is supplied to the developer transport member. However, the developer on the developer transport member is completely removed, and the occurrence of filming is prevented.
実施例 以下、本考案の実施例を図面に基づいて詳細に説明す
る。Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
第１図は、本考案の実施例の構成を示す図である。FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.
現像ローラ１は現像装置側板に回転自在に支持され、矢
印で示す方向に所定の速度で回転駆動される。図におい
て、現像ローラ１の右側には現像剤を貯溜するホッパ２
が形成されている。ホッパ２の下部には、現像ローラ１
に接して現像剤供給及び除去兼用回転部材３が設けられ
ており、現像時は矢印で示す方向に回転してホッパ２内
の現像剤を現像ローラ１に供給する。現像ローラ１に供
給された現像剤は、ドクターブレード４により薄層化さ
れ、現像ローラ１の図において左側で感光体10に接する
現像領域に搬送され、感光体10上の潜像を現像する。現
像剤供給兼除去回転部材に接して現像剤掻落し部材５が
設けられている。The developing roller 1 is rotatably supported by the side plate of the developing device, and is rotationally driven in a direction indicated by an arrow at a predetermined speed. In the figure, on the right side of the developing roller 1 is a hopper 2 for storing the developer.
Are formed. The developing roller 1 is provided below the hopper 2.
A developer supply / removal rotating member 3 is provided in contact with the developer, and rotates in the direction indicated by the arrow during development to supply the developer in the hopper 2 to the developing roller 1. The developer supplied to the developing roller 1 is thinned by the doctor blade 4 and is conveyed to the developing area in contact with the photoconductor 10 on the left side of the developing roller 1 in the figure, and the latent image on the photoconductor 10 is developed. A developer scraping member 5 is provided in contact with the developer supplying / removing rotating member.
現像終了時には現像剤供給兼除去回転部材３は回転を停
止し、現像ローラ１が少くとも１回転以上回転すること
により、現像ローラ１には新たに現像剤は供給されず、
現像ローラ１上に残留した現像剤は現像剤供給兼除去回
転部材３により完全に除去される。At the end of development, the developer supply / removal rotation member 3 stops rotating, and the developing roller 1 rotates at least one rotation, so that no new developer is supplied to the developing roller 1.
The developer remaining on the developing roller 1 is completely removed by the developer supplying / removing rotating member 3.
第２図は第１考案の別の実施例を示す図であり、現像剤
供給兼除去回転部材３は現像ローラ１の真下に設けら
れ、現像装置は全体として図の左右方向の長さが小さく
なり、感光体10の右側の空間が少ない場合に配置が容易
になる。第１図の装置と同一の機能を有する部材には同
一の符号が付されており、作用は第１図のものと同様で
ある。FIG. 2 is a view showing another embodiment of the first invention, in which the developer supplying / removing rotating member 3 is provided directly below the developing roller 1, and the developing device as a whole has a small lateral length in the drawing. Therefore, when the space on the right side of the photoconductor 10 is small, the arrangement becomes easy. Members having the same functions as those of the apparatus of FIG. 1 are designated by the same reference numerals, and the operation is the same as that of FIG.
第３図は第２考案の実施例を示す図である。第１図の装
置と同じ機能を有する部材には同一の符号が付されてい
る。第１図の装置と異る点は、現像剤供給兼除去回転部
材３と現像ローラ１との間に切替可能なバイアス電圧を
印加する手段６が設けられている点である。FIG. 3 is a diagram showing an embodiment of the second invention. Members having the same functions as those of the apparatus shown in FIG. 1 are designated by the same reference numerals. The difference from the apparatus shown in FIG. 1 is that a means 6 for applying a switchable bias voltage is provided between the developer supply / removal rotary member 3 and the developing roller 1.
これにより、現像時には、現像ローラ１と供給兼除去回
転部材３との間に現像剤を現像ローラ１に供給するのに
適したバイアス電圧が印加され、ホッパ２内の現像剤は
均一に安定して現像ローラ１に供給され、ドクターブレ
ード４により薄層化され、感光体10に接する現像領域に
搬送されて現像される。As a result, at the time of development, a bias voltage suitable for supplying the developer to the developing roller 1 is applied between the developing roller 1 and the supply / removal rotation member 3, and the developer in the hopper 2 is uniformly stabilized. Is supplied to the developing roller 1, thinned by the doctor blade 4, conveyed to the developing area in contact with the photoconductor 10, and developed.
現像完了時には、現像ローラ１と供給兼除去回転部材３
との間のバイアス電圧は現像剤の除去に適する電圧に切
換えられ、少くとも現像ローラ１の１回転の間印加され
るので、現像ローラ１には新たに現像剤は供給されず、
現像ローラ周面に残留した現像剤は完全に除去される。Upon completion of development, the developing roller 1 and the supply / removal rotating member 3
The bias voltage between and is switched to a voltage suitable for removing the developer, and is applied for at least one rotation of the developing roller 1, so that no new developer is supplied to the developing roller 1.
The developer remaining on the peripheral surface of the developing roller is completely removed.
第４図は、第２考案の他の実施例を示す図であり、第２
図と同様、現像剤供給兼除去回転部材３は現像ローラの
真下に設けられ、現像装置の図の左右方向の長さが短く
なっている。その作用は第３図のものと同様である。FIG. 4 is a view showing another embodiment of the second invention.
Similar to the drawing, the developer supplying / removing rotating member 3 is provided directly below the developing roller, and the length of the developing device in the left-right direction in the drawing is shortened. Its action is similar to that of FIG.
効果 以上の如く、本考案によれば、現像時には現像ローラに
均一に安定して現像剤が供給され、現像完了時には現像
ローラ上に残留した現像剤は完全に除去されてフィルミ
ングの発生が防止され良好な品質の画像が得られるとと
もに、現像剤の供給部材と除去部材とを一部材で兼用し
たことにより現像装置を小型化することができ、ひいて
は装置全体の小型化、コスト低減に効果が得られる。Effect As described above, according to the present invention, the developer is uniformly and stably supplied to the developing roller at the time of development, and the developer remaining on the developing roller is completely removed at the time of completion of development to prevent occurrence of filming. In addition to obtaining a good quality image, the developing device can be downsized by combining the developer supplying member and the removing member into one member, which is effective in downsizing the entire device and reducing costs. can get.
第１図は第１考案の実施例の構成を示す断面図、第２図
は第１考案の他の実施例の構成を示す断面図、第３図は
第２考案の実施例の構成を示す断面図、第４図は第２考
案の他の実施例の構成を示す断面図である。 １……現像ローラ（現像剤搬送体）、２……ホッパ（現
像剤貯溜部）、３……現像剤供給兼除去回転部材、４…
…ドクターブレード（薄層化部材）、６……切替可能な
バイアス電圧印加手段、10……感光体（潜像担持体）FIG. 1 is a sectional view showing the construction of an embodiment of the first invention, FIG. 2 is a sectional view showing the construction of another embodiment of the first invention, and FIG. 3 is a construction of the embodiment of the second invention. FIG. 4 is a sectional view showing the construction of another embodiment of the second invention. 1 ... Developing roller (developer carrier), 2 ... hopper (developer reservoir), 3 ... developer supply / removal rotating member, 4 ...
... Doctor blade (thin layering member), 6 ... Switchable bias voltage applying means, 10 ... Photoconductor (latent image carrier)
Claims (2)
現像剤を薄層化して潜像担持体に供給し潜像担持体上の
潜像を可視像化する静電記録装置の現像装置において、 上記の現像剤搬送体周面に接し現像剤貯溜部中に設けら
れ、現像時には上記現像剤貯溜部中に貯溜された現像剤
を現像剤搬送体周面に供給する方向に回転し、現像完了
時には上記現像剤搬送体が少くとも１回転する間停止さ
せて回転する現像剤搬送体上の現像剤を除去する現像剤
供給兼除去部材を有することを特徴とする現像装置。Claim: What is claimed is: 1. A development of an electrostatic recording apparatus, wherein a non-magnetic one-component developer is thinned by a rotating developer carrier and supplied to a latent image carrier to visualize the latent image on the latent image carrier. In the apparatus, it is provided in the developer storage portion in contact with the peripheral surface of the developer transport body, and rotates in a direction of supplying the developer stored in the developer storage portion to the peripheral surface of the developer transport body during development. A developing device comprising a developer supply / removal member for removing the developer on the developer transport body, which is stopped and rotated for at least one rotation of the developer transport body at the time of completion of development.
現像剤を薄層化して潜像担持体に供給し潜像担持体上の
潜像を可視像化する静電記録装置の現像装置において、 上記の現像剤搬送体周面に接し現像剤貯溜部中に設けら
れ、現像時には現像剤を現像剤搬送体に供給するに適す
るバイアス電圧が印加され、現像完了後現像剤搬送体が
少くとも１回転する間は、現像剤搬送体上の現像剤を剥
離するに適する上記と異るバイアス電圧が印加される現
像剤供給兼除去部材を有することを特徴とする現像装
置。2. Development of an electrostatic recording device for forming a non-magnetic one-component developer into a thin layer by a rotating developer carrier and supplying it to a latent image carrier to visualize the latent image on the latent image carrier. In the device, a bias voltage suitable for supplying the developer to the developer transport body is applied at the time of development in contact with the peripheral surface of the developer transport body in the developer storage portion, and after the development is completed, the developer transport body is A developing device comprising: a developer supply / removal member to which a bias voltage different from the above is applied, which is suitable for peeling off the developer on the developer transport body during at least one rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14271889U JPH0750761Y2 (en) | 1989-12-12 | 1989-12-12 | Development device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14271889U JPH0750761Y2 (en) | 1989-12-12 | 1989-12-12 | Development device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0381955U JPH0381955U (en) | 1991-08-21 |
| JPH0750761Y2 true JPH0750761Y2 (en) | 1995-11-15 |
Family
ID=31689535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14271889U Expired - Lifetime JPH0750761Y2 (en) | 1989-12-12 | 1989-12-12 | Development device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0750761Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012103368A (en) * | 2010-11-08 | 2012-05-31 | Murata Mach Ltd | Image forming apparatus |
-
1989
- 1989-12-12 JP JP14271889U patent/JPH0750761Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0381955U (en) | 1991-08-21 |
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