JPH04156486A - Wet type developer device - Google Patents
Wet type developer deviceInfo
- Publication number
- JPH04156486A JPH04156486A JP2281549A JP28154990A JPH04156486A JP H04156486 A JPH04156486 A JP H04156486A JP 2281549 A JP2281549 A JP 2281549A JP 28154990 A JP28154990 A JP 28154990A JP H04156486 A JPH04156486 A JP H04156486A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- developing roller
- developing
- agent
- roller
- 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
- 238000004140 cleaning Methods 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 10
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract 5
- 238000000576 coating method Methods 0.000 abstract 5
- 108091008695 photoreceptors Proteins 0.000 description 18
- 239000003086 colorant Substances 0.000 description 13
- 238000012546 transfer Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000001962 electrophoresis Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Landscapes
- Wet Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、電子写真方式の枚写機やプリンタ等の記録装
置に用いられ、絶縁性キャリア液体中に帯電粒子が分散
して構成される湿式現像剤を用いて、静電潜像を顕像化
する湿式現像装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in recording devices such as electrophotographic copying machines and printers, and is composed of charged particles dispersed in an insulating carrier liquid. The present invention relates to a wet-type developing device that visualizes an electrostatic latent image using a wet-type developer.
［従来の技術１
従来の湿式現像装置は、現像剤を溜めた皿状の電極−１
−を、静電潜像担持体が通過し静電潜像担持体に現像剤
が塗布される方式（特公昭６２−５１４６６等）が知ら
れ−Ｃいる。また現像部と現像剤タンクを真空ポンプを
介して接続し、現像剤を現像部の渦状の開口部から吐出
循環させる方式が知られている。 （特公昭４４−２３
７９２）［発明が解決しようとする課題１
これらの現像方式の現像装置においては、湿式現像剤は
、色剤（一般には顔料、樹脂からなる帯電トナー粒子）
とキャリア液とその他の添加剤より成るが、最終的に顕
像を形成する色剤の量に比して大量のキャリア液を必要
とする。従って大量のキャリア液を含む現像剤を貯える
ために、大きな空間を必要とし、画像形成装置全体が大
型化するという問題点を有していた。即ち電気泳動速度
は、現像剤の粘度に依存するため、必要な電気泳動速度
を得るためには、現像剤の粘度を低く保つ必要があり、
そのために、上記帯電トナー粒子を大量のキャリア液体
中に分散し、低粘度現像剤とする必要があったためであ
る。[Prior art 1] A conventional wet developing device has a plate-shaped electrode 1 that stores developer.
There is a known method (Japanese Patent Publication No. 62-51466, etc.) in which an electrostatic latent image carrier passes through the electrostatic latent image carrier and a developer is applied to the electrostatic latent image carrier. Also known is a method in which a developing section and a developer tank are connected via a vacuum pump, and the developer is discharged and circulated from a spiral opening in the developing section. (Special Public Interest Publication 44-23
792) [Problem to be Solved by the Invention 1 In these development type developing devices, the wet developer is a coloring agent (generally charged toner particles made of pigment or resin).
However, a large amount of carrier liquid is required compared to the amount of colorant that will ultimately form a developed image. Therefore, in order to store a large amount of developer containing a large amount of carrier liquid, a large space is required, resulting in the problem that the entire image forming apparatus becomes large. That is, the electrophoresis speed depends on the viscosity of the developer, so in order to obtain the required electrophoresis speed, it is necessary to keep the viscosity of the developer low.
This is because it is necessary to disperse the charged toner particles in a large amount of carrier liquid to form a low-viscosity developer.
またさらに、従来の現像装置において多色の現像剤で現
像を行う場合、現像部の待避機構を設ける必要がある、
現像剤の色切り替えに長時間を要する等の問題点を有し
ていた。Furthermore, when developing with multi-color developer in a conventional developing device, it is necessary to provide a retracting mechanism for the developing section.
This has had problems such as it takes a long time to change the color of the developer.
本発明の目的は、これらの問題点を解決し、現像に要す
る現像剤の量を減少させ少量の現像剤で、現像の可能な
湿式現像装置を実現することである。An object of the present invention is to solve these problems and to realize a wet-type developing device that can reduce the amount of developer required for development and perform development with a small amount of developer.
また多色用の現像装置を形成した場合に、色切り替え時
に現像部の待避機構が必要なく、瞬時に色切り替えが実
現できる現像装置を実現することである。Another object of the present invention is to realize a developing device that can instantaneously change colors without requiring a retracting mechanism for the developing section when changing colors when a developing device for multiple colors is formed.
１課題を解決するための手段１
第１の発明の湿式現像装置は、静電潜像担持体上の静電
潜像を、湿式現像剤で現像する湿式現像装置において、
現像剤を担持し静電潜像担持体と当接もしくは微小間隙
を介して対向し、前記静電潜像担持体へ前記現像剤を供
給する現像ローラーと、該現像ローラーへ現像剤を一様
に塗布する少なくとも一つの現像剤塗布部とを具備した
ことを特徴とする。1 Means for Solving the Problems 1 A wet-type developing device of the first invention is a wet-type developing device that develops an electrostatic latent image on an electrostatic latent image carrier with a wet developer. a developing roller that is in contact with or faces the electrostatic latent image bearing member through a small gap and supplies the developer to the electrostatic latent image bearing member; and at least one that uniformly applies the developer to the developing roller. It is characterized by comprising a developer application section.
第２の発明の湿式現像装置は、静電潜像担持体上の静電
潜像を、湿式現像剤で現像する湿式現像装置において、
現像剤を担持し静電潜像担持体と当接もしくは微小間隙
を介して対向し、前記静電潜像担持体へ前記現像剤を供
給する現像ローラーと、該現像ローラーへ現像剤を一様
に塗布する少なくとも一つの現像剤塗布部と
前記現像ローラーに当接して、前記現像ローラー塗布さ
れた現像剤を除去する現像ローラークリーニング部材と
を具備したことを特徴とする。A wet type developing device according to a second aspect of the invention is a wet type developing device for developing an electrostatic latent image on an electrostatic latent image carrier with a wet type developer. A developing roller facing each other with a small gap therebetween and supplying the developer to the electrostatic latent image carrier, at least one developer applying portion uniformly applying the developer to the developing roller, and the developing roller. The developing roller cleaning member is characterized in that it includes a developing roller cleaning member that comes into contact with the developing roller and removes the developer coated on the developing roller.
第３の発明の湿式現像装置は、静電潜像担持体上の静電
潜像を、湿式現像剤で現像する湿式現像装置において、
現像剤を担持し静電潜像担持体と当接もしくは微小間隙
を介して対向し、前記静電潜像担持体へ前記現像剤を供
給する現像ローラーと、該現像ローラーへ現像剤を一様
に塗布する少なくとも一つの現像剤塗布部と、
前記現像ローラーに当接して、前記現像ローラーに塗布
された現像剤を除去する現像ローラークリーニング部材
と、
前記現像ローラークリーニング部材の現像ローラーへの
当接状態を解除する、当接解除機構をを具備したことを
特徴とする。A wet type developing device according to a third aspect of the invention is a wet type developing device for developing an electrostatic latent image on an electrostatic latent image carrier with a wet type developer. a developing roller that faces each other with a minute gap in between and supplies the developer to the electrostatic latent image carrier; at least one developer applying section that uniformly applies the developer to the developing roller; and the developing roller. a developing roller cleaning member that comes into contact with the developing roller to remove the developer applied to the developing roller; and a contact release mechanism that releases the contact state of the developing roller cleaning member to the developing roller. Features.
［実施例 １ 本発明の実施例について、説明する。[Example 1] Examples of the present invention will be described.
第２図は、本発明の湿式現像装置を備えた電子写真プリ
ンタの断面図である。FIG. 2 is a sectional view of an electrophotographic printer equipped with the wet developing device of the present invention.
感光体ドラム１の周囲に帯電装置２、露光装置３、湿式
現像装置４、転写ローラ５、クリーニング装置７、除電
装置８が順次配置されている。A charging device 2 , an exposure device 3 , a wet developing device 4 , a transfer roller 5 , a cleaning device 7 , and a static eliminator 8 are arranged in this order around the photosensitive drum 1 .
静電潜像担持体である感光体ドラム１は第１図に示すよ
うに、アルミ素管１００の周囲にアモルファスセレン感
光層１０１が蒸着されたものである。矢印Ａの方向に回
転するよ・うに構成されている。As shown in FIG. 1, a photosensitive drum 1, which is an electrostatic latent image carrier, has an amorphous selenium photosensitive layer 101 deposited around an aluminum tube 100. It is configured to rotate in the direction of arrow A.
上記の構成により記録紙への画像形成が以下のように行
われる。圧力ローラを９′で示す位置の圧力解除状態に
置く。帯電工程、露光工程を経て、感光体ドラム１上に
、静電潜像が形成される。上記静電潜像は、湿式現像装
置４で現像剤を用いて現像される。すなわちトナー像が
形成される。感光体ドラム１上のトナー像が、転写ドラ
ム５に静電的に転写される。さらにクリーニング装置７
、除電装置８を経−Ｃ１再び帯電」工程に移る。With the above configuration, image formation on recording paper is performed as follows. The pressure roller is placed in the depressurized position at 9'. An electrostatic latent image is formed on the photoreceptor drum 1 through a charging process and an exposure process. The electrostatic latent image is developed using a developer in a wet type developing device 4. That is, a toner image is formed. The toner image on the photosensitive drum 1 is electrostatically transferred to the transfer drum 5. Furthermore, the cleaning device 7
, the static eliminator 8 is passed through -C1 and the process moves on to the "re-charging" process.
記録媒体である記録紙２］を収納する給紙装置２０より
搬出された記録紙２１は、トナー像の形成に合わせて、
転写領域に搬送される。The recording paper 21, which is carried out from the paper feeder 20 that stores the recording paper 2 which is a recording medium, is processed as a toner image is formed.
The image is transported to the transfer area.
次に、圧ツクローラを９に示す加圧状態にして押圧し、
トナー像が転写ドラム５から記録紙２１に転写される。Next, press the pressure roller in the pressurized state shown in 9,
A toner image is transferred from the transfer drum 5 to the recording paper 21.
記録紙２１−は、転写工程を経た後、剥離爪６により転
写ドラム５がら剥離され、熱定着装置］０において記録
紙２１」二のキャＴノア液を蒸発させ、更にトナー像を
固着し、排紙トレイ２２に収納される。After the recording paper 21- has undergone the transfer process, it is peeled off from the transfer drum 5 by a peeling claw 6, and the toner liquid on the recording paper 21-2 is evaporated in a thermal fixing device, and the toner image is further fixed. The paper is stored in the paper discharge tray 22.
現像剤は、キャリア液として、高抵抗石油系溶媒（例え
ばエッソ社製、アイソパー）中に、顔料とアクリル樹脂
からなるトナー粒子（色剤）を、帯電制御剤、分散安定
剤とともに分散して構成されている。本実施例では、正
帯電の感光体ドラム１の露光部にトナー粒子が選択的に
付着するよう、正帯電の現像剤を用いている。ここで現
像剤中のキＡ・リア液量は現像剤の搬送に支障が生じな
い範囲で可能な限り少なくされている。すなわち現像剤
中の色剤量（固形分濃度）は充分高められている。The developer is composed of toner particles (colorant) made of pigment and acrylic resin dispersed together with a charge control agent and a dispersion stabilizer in a high-resistance petroleum-based solvent (for example, Esso, Isopar) as a carrier liquid. has been done. In this embodiment, a positively charged developer is used so that toner particles selectively adhere to the exposed portion of the positively charged photoreceptor drum 1. Here, the amounts of the K A and rear liquids in the developer are kept as small as possible within a range that does not impede the conveyance of the developer. That is, the amount of coloring agent (solid content concentration) in the developer is sufficiently increased.
第１図は本発明第２の発明の第１の実施例である湿式現
像装置の構成を示す図である。現像剤吐出スリット７２
を有する現像剤塗布部である現像剤塗布ヘッド５５が、
スリット開口１１１を現像ローラー］０３に向けて設け
られている。現像ローラ１０３は、導電性を有する弾性
材質からなり、感光体ドラム１と弾性的に接触しながら
感光体ドラム１と同一速度で矢印Ｂの方向に回転する。FIG. 1 is a diagram showing the configuration of a wet type developing device which is a first embodiment of the second invention of the present invention. Developer discharge slit 72
The developer application head 55, which is a developer application section, has
The slit opening 111 is provided so as to face the developing roller]03. The developing roller 103 is made of a conductive elastic material, and rotates in the direction of arrow B at the same speed as the photosensitive drum 1 while being in elastic contact with the photosensitive drum 1 .
現像ローラークリーニング部材１］、０は、先端が現像
ローラ１０３に当接して設けられたプレートであり、材
質は、金属、樹脂、ゴムいずれを用いてもにい。Developing roller cleaning member 1], 0 is a plate whose tip is in contact with the developing roller 103, and the material may be metal, resin, or rubber.
吹に現像動作を説明する。感光体ドラム１は、表面を正
電荷で一様帯電され、露光工程を経て、露光部１０５は
略グランド電位（例えば４． ＯＶ ）、非露光部１０
４は正電位（例えば５００Ｖ）を持ち湿式現像装置４に
入る。現像ローラー１０３は、電源１０２−ａにより非
露光部の正電位より低い値の正電位（例えば４５０Ｖ）
に保たれている。Let me briefly explain the developing operation. The surface of the photoreceptor drum 1 is uniformly charged with a positive charge, and through an exposure process, the exposed area 105 is at approximately ground potential (for example, 4.OV), and the non-exposed area 10 is at approximately ground potential (for example, 4.OV).
4 enters the wet developing device 4 with a positive potential (for example, 500 V). The developing roller 103 is supplied with a positive potential (for example, 450 V) lower than the positive potential of the non-exposed area by the power source 102-a.
is maintained.
また現像剤塗布ヘット先端部７４も導電性材質からなっ
ており、電源１０２−ｂにＪ：り現像ローラー１０３よ
りも高い正電位（例えば５００Ｖ）に保たれ、現像剤塗
布ヘッド先端部７４と現像ローラー１０３間には電界が
形成される。Further, the developer application head tip 74 is also made of a conductive material, and is maintained at a positive potential (for example, 500 V) higher than that of the developing roller 103 by the power supply 102-b, and is connected to the developer application head tip 74 and the developing roller 103. An electric field is formed between the rollers 103.
ここで現像剤吐出ス１ノット７２から前述したように充
分固形分濃度の高い湿式現像剤５６が吐出され、現像ロ
ーラー１．０３上に一様に塗布される。Here, the wet type developer 56 having a sufficiently high solid content concentration is discharged from the developer discharge knot 72 as described above, and is uniformly applied onto the developing roller 1.03.
現像剤中のトナー粒子は、正に帯電しており、現像剤吐
出スリット７２からの吐出及び前記の電界により、キャ
リア液体を伴ってｌ・ナーの移動を可能ならしめる最小
限の湿潤状態で現像ローラー１０３に層状に付着する。The toner particles in the developer are positively charged, and due to the discharge from the developer discharge slit 72 and the electric field described above, the toner particles are developed in a minimally wet state that allows the toner to move with the carrier liquid. It adheres to the roller 103 in a layered manner.
現像ローラー１０３は層状に付着した現像剤層１０６を
介して、感光体ドラム１に弾性的に当接し、かつ当接部
において感光体ドラム１の周速と同速で回転している。The developing roller 103 elastically contacts the photoreceptor drum 1 via the layered developer layer 106, and rotates at the same speed as the circumferential speed of the photoreceptor drum 1 at the contact portion.
現像ローラー１０３が感光体ドラム１との当接部を通過
する際、現像ローラー１０３上に担持された現像剤層１
０６は、感光体トラム１上に形成された静電潜像に応し
て静電気的な力を受ける。ずなわち感光体トラム１の露
光部１０５においては、感光体ドラム１に向け、同非露
光部１０４においては現像ローラ１０３に向けて力を受
ける。この結果、露光部１０５には現像剤層１０６が転
移し、非露光部１０４では現像剤層］−０６は現像ロー
ラ１０３に残留し、感光体ドラム１上にトナー像が形成
される。現像ローラー１０３上の現像剤中の固形分濃度
は充分高く保たれているため、従来の現像装置のように
、現像領域に多量に現像剤を供給せずに顕像化がされる
。現像ローラー１０３に残留した現像剤層１０６は、現
像ローラーク＋７−ニング部材である現像ローラークリ
ーニングブレード１１０により掻きとられ、現像剤回収
容器１３０に収納される。従って現像領域には常に一定
の高い固形分濃度の現像剤が供給されるため画像濃度が
経時的に変化することがない。なお現像ローラークリー
ニング部材はローラー状のスポンジを用いて構成しても
よい。また本実施例中では、現像ローラーを感光体ドラ
ムと当接させる構成について説明したが、以下のような
構成で、現像ローラーに担持される現像剤層の厚み程度
の微小な間隙を、現像ローラーと感光体ドラム間に確保
してもよい。すなわち現像ローラー両端に、現像ローラ
ー径よりもわずかに大きい径を有する微小ギャップ保持
用コロを設け、これを感光体ドラムと当接させることで
前記の微小なギャップを確保する。When the developing roller 103 passes through the contact portion with the photoreceptor drum 1, the developer layer 1 carried on the developing roller 103
06 receives an electrostatic force in response to the electrostatic latent image formed on the photoreceptor tram 1. In other words, the exposed portion 105 of the photoreceptor tram 1 receives a force toward the photoreceptor drum 1, and the non-exposed portion 104 receives a force toward the developing roller 103. As a result, the developer layer 106 is transferred to the exposed area 105, and the developer layer ]-06 remains on the developing roller 103 in the non-exposed area 104, and a toner image is formed on the photoreceptor drum 1. Since the solid content concentration in the developer on the developing roller 103 is kept sufficiently high, visualization can be performed without supplying a large amount of developer to the developing area as in conventional developing devices. The developer layer 106 remaining on the developing roller 103 is scraped off by a developing roller cleaning blade 110, which is a developing roller cleaning member, and stored in a developer recovery container 130. Therefore, since a developer having a constant high solid content concentration is always supplied to the developing area, the image density does not change over time. Note that the developing roller cleaning member may be constructed using a roller-shaped sponge. Furthermore, in this embodiment, a configuration in which the developing roller is brought into contact with the photoreceptor drum has been described, but with the following configuration, a minute gap approximately equal to the thickness of the developer layer supported on the developing roller is It may also be secured between the photoreceptor drum and the photoreceptor drum. That is, the minute gap maintaining rollers having a diameter slightly larger than the diameter of the developing roller are provided at both ends of the developing roller, and the rollers are brought into contact with the photoreceptor drum to ensure the above-mentioned minute gap.
次に現像剤塗布ヘッド５５への現像剤供給に関して説明
する。第３図は現像剤塗布ヘッド５５への現像剤の供給
系を示す図である。供給孔７１には、制御弁５３を介し
て現像剤貯蔵容器５１が配管６３．７０によって接続さ
れている。Next, the supply of developer to the developer application head 55 will be explained. FIG. 3 is a diagram showing a developer supply system to the developer application head 55. As shown in FIG. The developer storage container 51 is connected to the supply hole 71 via a control valve 53 by a pipe 63.70.
現像剤貯蔵容器５１は、容器６２の内部が現像剤５６と
高圧不活性気体５７で充されている。このような現像剤
貯蔵容器５１は例えば、特開平２−６４５８７等に開示
されている。一端７５が開放された中空のパイプ７４は
、他端６０が閉じられ、該閉鎖端６０の近傍に細孔６】
を有する。可動キャップ５９は、パイプ７４に対しスラ
イド可能で、且つスライド部から容器６２の内容物が漏
れないようにシールされている。これが、バネ５８で矢
印Ｃの方向に付勢されている。可動キャップ５９がバネ
５８の力に抗して、矢印Ｃと反対方向に押し込められる
と、可動キャップ５９の側面に開けられた細孔６２と、
パイプ７４の細孔６１が通じて、容器６２の内部圧力に
より、現像剤５６が容器外へ押し出される。第３図に示
す可動キャップ５９は、説明のために、現像剤５６を供
給しない状態が図示されている。動作状態では、細孔６
１と細孔６２が通じた状態で、取り付けられる。The developer storage container 51 has a container 62 filled with a developer 56 and a high-pressure inert gas 57 . Such a developer storage container 51 is disclosed in, for example, Japanese Patent Laid-Open No. 2-64587. A hollow pipe 74 has one end 75 open, the other end 60 is closed, and a pore 6] is formed near the closed end 60.
has. The movable cap 59 is slidable relative to the pipe 74 and is sealed to prevent the contents of the container 62 from leaking from the sliding portion. This is biased in the direction of arrow C by a spring 58. When the movable cap 59 is pushed in in the direction opposite to the arrow C against the force of the spring 58, a pore 62 opened in the side surface of the movable cap 59,
The developer 56 is pushed out of the container by the internal pressure of the container 62 through the pore 61 of the pipe 74 . For the sake of explanation, the movable cap 59 shown in FIG. 3 is shown in a state in which the developer 56 is not supplied. In operating condition, pore 6
1 and the pore 62 are in communication with each other.
つぎに制御弁５３の構成を説明する。可動軸６４がバネ
６８で付勢され先端ブロック６７が入口側６５と出口側
６６を遮断する構成である。電磁装置６９によって、可
動軸６４をバネ６７に抗して軸方向にズライドすること
によって、先端ブロック６７に部分が開き、開放状態に
なる。Next, the configuration of the control valve 53 will be explained. The movable shaft 64 is biased by a spring 68 and the tip block 67 blocks an inlet side 65 and an outlet side 66. By sliding the movable shaft 64 in the axial direction against the spring 67 by means of the electromagnetic device 69, a portion of the tip block 67 opens and becomes an open state.
現像剤貯蔵容器５１は移動キャップ５９を押し下げた、
開放状態でセットする。像形成時は制御弁５３を開放状
態にすると、現像剤貯蔵容器５１の内部圧力が、高圧力
であるため、湿式現像剤５６は配管６３．７０を介して
現像ヘッド５５の現像剤吐出スリット７２を充し開口１
１１から吐出し、現像ローラー１０３上に塗布される。The developer storage container 51 pushes down the moving cap 59.
Set it in the open state. When the control valve 53 is opened during image formation, the internal pressure of the developer storage container 51 is high, so the wet developer 56 is delivered to the developer discharge slit 72 of the development head 55 via the pipe 63.70. Fill opening 1
11 and is applied onto the developing roller 103.
第４図は本発明第２の発明の第２の実施例である湿式現
像装置の構成を示す図である。第１の実施例においては
、現像剤貯蔵容器中の高圧不活性気体の作用により、ス
リットから現像剤を吐出させていたが、本実施例では、
圧電素子をを用いて現像剤を吐出させる点が第１の実施
例と異なる点である。以下図を用いて説明する。FIG. 4 is a diagram showing the configuration of a wet type developing device which is a second embodiment of the second invention of the present invention. In the first embodiment, the developer was discharged from the slit by the action of high-pressure inert gas in the developer storage container, but in this embodiment,
This embodiment differs from the first embodiment in that the developer is discharged using a piezoelectric element. This will be explained below using figures.
現像剤塗布ヘッド５５は、ＰＺＴ等からなる厚み６０μ
程度の圧電体薄板４０と、２０μ程度の微小な間隙を介
して前記圧電体薄板に対向して配置された対向板４１と
、前記対向する二枚の板の一端をシールする底板４２よ
り構成される。第５図は対向する２枚の板４０．４１よ
り構成される開口端部近傍の断面図である。圧電体薄板
４０開口端近傍の表裏両面には、電極４３が設けられて
いる。底板４２近傍に現像剤１０６が供給されると、現
像剤１０６は毛細管力の働きにより開口端まで持ち上げ
られる。ここで電極４３間に、電源４４より電圧実効値
６０Ｖ周波数１．５ＭＨ２の交流電圧を印加すると、圧
電体薄板４０が振動し、この振動が開口端部の現像剤１
０６に伝搬し、開口端より現像剤５６が噴霧状に吐出し
現像ローラー］。０３に現像剤１０６が一様に塗布され
４゜ここで電極４０を記録紙幅に応じて複数枚の電極か
ら構成し、特定の電極のみに電圧を印加することで、現
像ローラー１０３長手方向の所望の幅に現像剤を塗布す
ることも可能となる。現像剤塗布工程以外は第１の実施
例と同様であるため説明を省略する。The developer application head 55 is made of PZT or the like and has a thickness of 60 μm.
It consists of a thin piezoelectric plate 40 of approximately 20 μm, an opposing plate 41 disposed opposite to the thin piezoelectric plate with a small gap of approximately 20 μm, and a bottom plate 42 sealing one end of the two opposing plates. Ru. FIG. 5 is a sectional view of the vicinity of the opening end formed by two opposing plates 40 and 41. Electrodes 43 are provided on both the front and back surfaces of the piezoelectric thin plate 40 near the opening end. When the developer 106 is supplied near the bottom plate 42, the developer 106 is lifted up to the open end by the action of capillary force. When an AC voltage with an effective voltage value of 60 V and a frequency of 1.5 MH2 is applied between the electrodes 43 from the power supply 44, the piezoelectric thin plate 40 vibrates, and this vibration causes the developer 1 at the opening end to
06, and the developer 56 is discharged in a spray form from the open end of the developing roller]. The developer 106 is uniformly applied to the developing roller 103 at 4 degrees.The electrode 40 is constructed from a plurality of electrodes according to the width of the recording paper, and by applying voltage only to specific electrodes, the desired longitudinal direction of the developing roller 103 can be adjusted. It is also possible to apply the developer over a width of . Since the steps other than the developer application step are the same as those in the first embodiment, the explanation will be omitted.
第６図は、本発明第２の発明の第３の実施例である湿式
多色現像装置である。各色異なる４色の現像剤を吐出す
る４個の現像剤塗布ヘッド５５−ａ、５５−ｂ、５５−
Ｃ２５５−ｄが、現像ローラー］０３に近接配置されて
いる点が、第１、第２の実施例と異なる点である。ここ
で各界なる４色は、イエロー、マゼンダ、シアン、ブラ
ックの４色であり、各色のトナー像の重ね合わせにより
最終的にはフルカラー画像が形成される。まず第１色目
の現像剤が選択され、即ち、第１色目の現像剤が、第１
の現像剤塗布ヘッド５５−ａにより現像ローラー１０３
に塗布され、第１第２の実施例と同様の画像形成プロセ
スにより、感光体ドラム］上の第１色目」の静電潜像が
顕像化され、中間転写ドラム５上に転写される。現像剤
塗布ヘッド５５選択の信号を切り替えることにより、引
続き、現像剤の現像ローラー１０３への塗布が、第１色
目の現像剤塗布ヘッド５５−ａから第２色目の現像剤塗
布ヘッド５５−ｂへと切り替えられて行われる。第１色
目と同様にして第２色目の静電潜像が顕像化され、中間
転写ドラム５」二の第１色目のトナー像の」二に第２色
目のトナー像が重ねて転写される。以下同様にして、第
３色目、第４色目のトナー像が中間転写ドラム５上で重
ねられ、フルカラー画像が形成される。中間転写ドラム
５上のフルカラー画像は一括して記録紙２１に転写され
る。FIG. 6 shows a wet multi-color developing device which is a third embodiment of the second invention of the present invention. Four developer application heads 55-a, 55-b, 55- each discharging four different colors of developer.
The difference from the first and second embodiments is that C255-d is disposed close to the developing roller]03. Here, the four colors of each field are yellow, magenta, cyan, and black, and a full-color image is finally formed by overlapping toner images of each color. First, the first color developer is selected, that is, the first color developer is the first color developer.
The developing roller 103 is applied by the developer applying head 55-a.
By the same image forming process as in the first and second embodiments, the electrostatic latent image of the first color on the photosensitive drum is visualized and transferred onto the intermediate transfer drum 5. By switching the signal for selecting the developer application head 55, application of the developer to the developing roller 103 is continued from the first color developer application head 55-a to the second color developer application head 55-b. This is done by switching between The electrostatic latent image of the second color is visualized in the same manner as the first color, and the toner image of the second color is superimposed and transferred onto the toner image of the first color on the intermediate transfer drum 5. . Thereafter, in the same manner, the third and fourth color toner images are superimposed on the intermediate transfer drum 5 to form a full-color image. The full color image on the intermediate transfer drum 5 is transferred to the recording paper 21 all at once.
本発明では、現像剤塗布ヘッド５５選択の信号を切り替
えるだけで、混色なく瞬時に現像剤の色切り替えが行わ
れる。また部材の待避等のための駆動機構も設ける必要
がない。In the present invention, by simply switching the signal for selecting the developer application head 55, developer colors can be switched instantaneously without color mixture. Further, there is no need to provide a drive mechanism for retracting the members.
第７図は、本発明筒１の発明の一実施例である湿式現像
装置の構成を示す図である。現像ローラークリーニング
ブレードが設けられていない点が本発明筒２の発明筒１
の実施例と異なる点である。FIG. 7 is a diagram showing the configuration of a wet type developing device which is an embodiment of the invention of the cylinder 1 of the present invention. The difference between the invention cylinder 2 and the invention cylinder 1 is that the developing roller cleaning blade is not provided.
This is different from the embodiment.
現像ローラー１０３が感光体ドラム１との当接領域を通
過後も現像ローラー１０３」二に残留する現像剤は、再
利用される。感光体ドラム１との当接領域通過後の現像
ローラー１０３上の現像剤の付着パターンは、静電潜像
の画像パターンに依存するが、現像剤塗布ヘッドにより
高圧で現像剤が塗出されるため、現像剤塗布ヘラ１５５
通過後の、現像ローラー１０３」二での現像剤１０６の
塗布状態は一様である。静電潜像の顕像化が終γした詩
点で、現像剤塗布ヘッド５５からの現像剤１０６吐出が
停止される。従って現像ローラー１０３の１回転毎に現
像ローラークリーニングブレード１］０により現像剤１
０６の除去を行わないため、本発明筒２の発明に比して
現像剤の有効利用が図られる。The developer remaining on the developing roller 103 even after the developing roller 103 passes through the contact area with the photoreceptor drum 1 is reused. The adhesion pattern of the developer on the developing roller 103 after passing through the contact area with the photoreceptor drum 1 depends on the image pattern of the electrostatic latent image, but since the developer is applied at high pressure by the developer application head. , developer application spatula 155
After passing, the state of application of the developer 106 on the developing roller 103'2 is uniform. At the point where the electrostatic latent image has finished being visualized, the discharge of the developer 106 from the developer application head 55 is stopped. Therefore, every rotation of the developing roller 103, the developer 1 is removed by the developing roller cleaning blade 1]0.
06 is not removed, the developer can be used more effectively than in the case of the cylinder 2 of the present invention.
第８図は、本発明筒３の発明の一実施例である湿式現像
装置の構成を示す図である。現像ローラークリーニング
ブレード１ ］、 Ｏの当接解除機構１２０が改番フら
れている点が第１の発明筒１の実施例と異なる点である
。現像ローラークリーニングブレード１１０がブレード
支持板１２１に支持され、ブレード支持板は１２１、現
像剤回収容器１３０に固定された支持軸１２２に回動自
由に支承されている。またブレード支持板１２１は、押
圧バネ１２３と電磁装置１２４の可動部１２５とにより
その姿勢が決められる。すなわち電磁装置可動部］−２
５が伸びた状態では、現像ローラークリーニングブレー
ド１１０の当接が解除され、電磁装置可動部１２５が縮
んだ状態では、現像ローラークリーニングブレード１】
０が当接状態となる。FIG. 8 is a diagram showing the structure of a wet type developing device which is an embodiment of the invention of the cylinder 3 of the present invention. This embodiment differs from the first embodiment of the invention cylinder 1 in that the contact release mechanism 120 of the developing roller cleaning blade 1 ] and O is numbered differently. The developing roller cleaning blade 110 is supported by a blade support plate 121, and the blade support plate 121 is rotatably supported by a support shaft 122 fixed to a developer recovery container 130. Further, the attitude of the blade support plate 121 is determined by the pressing spring 123 and the movable part 125 of the electromagnetic device 124. In other words, the moving part of the electromagnetic device]-2
When the developing roller cleaning blade 110 is in the extended state, the contact with the developing roller cleaning blade 110 is released, and when the electromagnetic device movable part 125 is contracted, the developing roller cleaning blade 1]
0 is in contact state.
他のト１／ｉ成は第２の発明筒１の実施例と同様である
ため説明を省略する。The other configurations of the cylinder 1/i are the same as those of the second embodiment of the invention tube 1, so the explanation thereof will be omitted.
静電潜像の顕像化（現像ローラーから感光体へ現像剤の
転移）がイアわれている期間は、当接解除機構より、現
像ローラークｊノーニングブレード１１０当接が解除さ
れ、現像ローラー］−０３上に残留する現像剤は、再利
用される。静電潜像の顕像化が終了した時点で、現像剤
塗布ヘッド５５からの現像剤１０６吐出が停止され、ま
た現像ローラークリーニングブレートコ−１０が当接状
態にされ、トナー像形成に供されず、現像ローラー１−
０３上に付着している現像剤］、０．６が現像剤回収容
器１３０に回収される。During the period when the electrostatic latent image is not visualized (transfer of developer from the developing roller to the photoreceptor), the contact release mechanism releases the contact of the developing roller and the noning blade 110, and the developing roller] The developer remaining on -03 is reused. When the development of the electrostatic latent image is completed, the discharge of the developer 106 from the developer application head 55 is stopped, and the developing roller cleaning plate 10 is brought into contact with the developing roller cleaning plate 10 to form a toner image. Developing roller 1-
03], 0.6 is collected in the developer collection container 130.
本発明筒３の発明も第２の発明の第３の実施例と同様に
して、湿式多色現像装置を構成することもできる。すな
わち各色異なる現像剤塗布ヘットを４本設け、色切り替
え時、及び最終色の顕像化季冬Ｙイ裔に現像ローラーク
リーニングフ゛レードを当接させることにより多色のカ
ラー画像が形成てき［発明の効果１
本発明によれば、現像剤中に大量のキャリア液を含める
ことなく静電潜像の顕像化が行われる。The invention of the cylinder 3 of the present invention can also constitute a wet multicolor developing device in the same manner as the third embodiment of the second invention. That is, a multicolor image can be formed by providing four different developer application heads for each color and bringing the developing roller cleaning blade into contact with the developing roller of the final color when switching colors. 1 According to the present invention, an electrostatic latent image can be visualized without including a large amount of carrier liquid in the developer.
従って、必要となる現像剤の体積容量を減らすことがで
き、すなわち現像剤を貯えるための空間を小さくするこ
とができ、画像形成装置全体の小型化が図れるという効
果を有する。Therefore, the required volume capacity of the developer can be reduced, that is, the space for storing the developer can be reduced, and the overall size of the image forming apparatus can be reduced.
また本発明によれば、多色用の現像装置を形成した場合
に、色切り替え時に現像部の待避機構が必要なく、瞬時
に色切り替えが実現できる現像装置を実現できるという
効果も有する。Further, according to the present invention, when a multi-color developing device is formed, there is no need for a retracting mechanism for the developing section when changing colors, and it is possible to realize a developing device that can instantly change colors.
第１図は、本発明の第２発明の第１の実施例である湿式
現像装置の構成を示す図。
第２図は、本発明の湿式多色現像装置を備えた電子写真
真プリンタの断面図。
第３図は、本発明の湿式現像装置の現像剤塗布ヘッドへ
現像剤の供給系を示す図。
第４図は、本発明の第２発明の第２の実施例である湿式
現像装置の構成を示す図。
第５図は、本発明の第２発明の第２の実施例である湿式
現像装置に用いられる現像剤塗布ヘッドの開口端近傍の
断面図。
第６図は、本発明の第２発明の第３の実施例である湿式
現像装置の構成を示す図。
第７図は、本発明の第１発明の一実施例である湿式現像
装置の構成を示す図。
第８図は、本発明の第３発明の一実施例である湿式現像
装置の構成を示す図。
１ 感光体ドラム
４ 湿式現像装置
５１ 現像剤貯蔵容器
５３ 制御弁
５５ 現像剤塗布ヘッド
７２ 現像剤吐出スリット
１０３ 現像ローラー
以上
５中開−転写ドラへFIG. 1 is a diagram showing the configuration of a wet type developing device which is a first embodiment of the second invention of the present invention. FIG. 2 is a sectional view of an electrophotographic printer equipped with the wet multicolor developing device of the present invention. FIG. 3 is a diagram showing a developer supply system to the developer application head of the wet developing device of the present invention. FIG. 4 is a diagram showing the configuration of a wet type developing device which is a second embodiment of the second invention of the present invention. FIG. 5 is a sectional view of the vicinity of the opening end of a developer application head used in a wet type developing device according to a second embodiment of the second invention of the present invention. FIG. 6 is a diagram showing the configuration of a wet type developing device according to a third embodiment of the second invention of the present invention. FIG. 7 is a diagram showing the configuration of a wet type developing device which is an embodiment of the first invention of the present invention. FIG. 8 is a diagram showing the configuration of a wet type developing device which is an embodiment of the third aspect of the present invention. 1 Photoreceptor drum 4 Wet type developing device 51 Developer storage container 53 Control valve 55 Developer application head 72 Developer discharge slit 103 Developing roller and above 5 middle open - To transfer driver
Claims (2)
液体中に帯電粒子が分散して構成される湿式現像剤（以
下現像剤という）で現像する湿式現像装置において、 現像剤を担持し静電潜像担持体と当接もしくは微小間隙
を介して対向し、前記静電潜像担持体へ前記現像剤を供
給する現像ローラーと、 該現像ローラーへ現像剤を一様に塗布する少なくとも一
つの現像剤塗布部とを具備したことを特徴とする湿式現
像装置(1) In a wet-type developing device that develops an electrostatic latent image on an electrostatic latent image carrier with a wet-type developer (hereinafter referred to as developer) composed of charged particles dispersed in an insulating carrier liquid, a developing roller that carries a developer and is in contact with or faces the electrostatic latent image carrier through a small gap and supplies the developer to the electrostatic latent image carrier; and a developer roller that uniformly supplies the developer to the developer roller. A wet-type developing device comprising at least one developer applying section for applying a developer.
も一つの現像剤塗布部と 前記現像ローラーに当接して、前記現像ローラーに塗布
された現像剤を除去する現像ローラークリーニング部材
とを具備したことを特徴とする請求項（１）記載の湿式
現像装置。（３）現像ローラークリーニング部材の現像
ローラーへの当接状態を解除する、当接解除機構を具備
したことを特徴とする請求項（２）記載の湿式現像装置(2) At least one developer applying section that uniformly applies developer to the developing roller, and a developing roller cleaning member that comes into contact with the developing roller and removes the developer applied to the developing roller. The wet developing device according to claim 1, characterized in that: (3) The wet type developing device according to claim (2), further comprising a contact release mechanism that releases the contact state of the developing roller cleaning member to the developing roller.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2281549A JPH04156486A (en) | 1990-10-19 | 1990-10-19 | Wet type developer device |
| US07/775,130 US5387760A (en) | 1990-10-19 | 1991-10-11 | Wet recording apparatus for developing electrostatic latent image |
| DE69122019T DE69122019T2 (en) | 1990-10-19 | 1991-10-18 | Wet development device and method |
| EP91117841A EP0481516B1 (en) | 1990-10-19 | 1991-10-18 | Wet development apparatus and method |
| KR1019910018462A KR950003314B1 (en) | 1990-10-19 | 1991-10-19 | Wet development apparatus, wet recording apparatus and wet recording method |
| US08/296,416 US5434352A (en) | 1990-10-19 | 1994-08-26 | Wet recording apparatus for developing electrostatic latent images |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2281549A JPH04156486A (en) | 1990-10-19 | 1990-10-19 | Wet type developer device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04156486A true JPH04156486A (en) | 1992-05-28 |
Family
ID=17640732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2281549A Pending JPH04156486A (en) | 1990-10-19 | 1990-10-19 | Wet type developer device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04156486A (en) |
-
1990
- 1990-10-19 JP JP2281549A patent/JPH04156486A/en active Pending
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