JPS5837540B2 - Wet electrophotographic copying machine - Google Patents
Wet electrophotographic copying machineInfo
- Publication number
- JPS5837540B2 JPS5837540B2 JP54155562A JP15556279A JPS5837540B2 JP S5837540 B2 JPS5837540 B2 JP S5837540B2 JP 54155562 A JP54155562 A JP 54155562A JP 15556279 A JP15556279 A JP 15556279A JP S5837540 B2 JPS5837540 B2 JP S5837540B2
- Authority
- JP
- Japan
- Prior art keywords
- photoreceptor
- developer
- image
- copying machine
- electrophotographic copying
- 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
- 108091008695 photoreceptors Proteins 0.000 claims description 59
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 10
- 238000012546 transfer Methods 0.000 description 10
- 238000011161 development Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Wet Developing In Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は現像液を使用する湿式電子写真複写機に係り、
特｛こ惑光体のほぼ２回転中に一連の複写処理工程を行
なう機構を備えた湿式電子写真複写機に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wet-type electrophotographic copying machine that uses a developer,
In particular, the present invention relates to a wet-type electrophotographic copying machine equipped with a mechanism that performs a series of copying processes during approximately two rotations of a light body.
この種複写機の概略構或を第１図とともに説明する。The general structure of this type of copying machine will be explained with reference to FIG.
ドラム形感光体１の近傍にその回転進行方向Ａに沿って
、帯電・転写兼用帯電器２、露光装置３、除重用帯電器
４、現像部５、クリーニング部材６、スクイズローラ７
が順次所定の間隔をおいて設置されている。In the vicinity of the drum-shaped photoreceptor 1, along the rotation direction A, there are provided a charging/transferring charger 2, an exposure device 3, a weight-removing charger 4, a developing section 5, a cleaning member 6, and a squeeze roller 7.
are sequentially installed at predetermined intervals.
クリーニング部材６は回動軸８を中心にして回動するこ
とにより、その先端部が感光体１の表面に接触したりあ
るいは離れたりするようになっている。The cleaning member 6 rotates around a rotation shaft 8, so that its tip comes into contact with or separates from the surface of the photoreceptor 1.
スクイズローラ７は感光体１に対し微小間隙Ｇを介して
設置され、感光体１の回転進行方向Ａとは反対の方向に
回転するようになっており、スクイズローラ７の局面に
はスクイズブレード９が接触している。The squeeze roller 7 is installed with a small gap G between the photoreceptor 1 and rotates in a direction opposite to the rotation direction A of the photoreceptor 1. are in contact.
次にこの複写機の作動順序｛こついて説明する。Next, the operating order of this copying machine will be explained.
複写機のメインスイッチ（図示せず）を入れると、それ
と同時｛こ感光体１が回転し始め、現像部５に現像液１
０を送り込むための現像液ポンプ（図示せず）が作動状
態｛こなる。When the main switch (not shown) of the copying machine is turned on, at the same time the photoreceptor 1 begins to rotate and the developer 1 is poured into the developing section 5.
A developer pump (not shown) for feeding 0 is in operation.
感光体１の第１回目の回転において、帯電器２のコロナ
放電で感光体１の表面が一様に帯電されて感光性が付与
され、次の露光装置３で原稿面の照射により原稿像に対
応した静電潜像が感光体表面に形威される。During the first rotation of the photoreceptor 1, the surface of the photoreceptor 1 is uniformly charged by the corona discharge of the charger 2, imparting photosensitivity, and the next exposure device 3 irradiates the document surface to form an original image. A corresponding electrostatic latent image is formed on the photoreceptor surface.
そしてオフ状態になっている帯電器４の下を通過し、現
像部５において現像液１０が感光体１の表面に付着され
、前記静電潜像が顕像化される。Then, it passes under the charger 4 which is in the OFF state, and in the developing section 5, the developer 10 is attached to the surface of the photoreceptor 1, and the electrostatic latent image is visualized.
このようにして形成された画像の先端がクリーニング部
材６の所に到達する少し前に、感光体１に接触していた
クリーニング部材６が感光体１から離れる。Shortly before the leading edge of the image thus formed reaches the cleaning member 6, the cleaning member 6, which was in contact with the photoreceptor 1, leaves the photoreceptor 1.
そして、クリーニング部材６が離れた時点の感光体１の
表面位置がスクイズローラ７の位置に到達したときから
液切りが行なわれ、余剰の現像液はスクイズローラ７で
感光体１から取り除かれて、スクイズブレード９を通っ
て回収される。Then, when the surface position of the photoreceptor 1 at the time when the cleaning member 6 is separated reaches the position of the squeeze roller 7, liquid draining is performed, and excess developer is removed from the photoreceptor 1 by the squeeze roller 7. It is collected through the squeeze blade 9.
引き続き感光体１が２回目の回転に入り、給紙装置（図
示せず）から感光体１と帯電器２の間に転写機（図示せ
ず）が供給され、帯電器２によって感光体１に付着して
いる現像剤が転写紙に移転される。Subsequently, the photoreceptor 1 enters its second rotation, and a transfer device (not shown) is supplied between the photoreceptor 1 and the charger 2 from a paper feeder (not shown), and the charger 2 transfers the image to the photoreceptor 1. The adhering developer is transferred to the transfer paper.
その後転写紙は、加熱定着装置１１に送られて現像液の
乾燥・定着が行なわれて機外へ排出される。Thereafter, the transfer paper is sent to a heat fixing device 11, where the developer is dried and fixed, and then discharged outside the machine.
一方、感光体１は転写後、光線が投影されていない露光
装置３の下を通過し、帯電器４において除電され、再び
感光体１の表面に当接したクリーニング部材６によって
残留現像剤の除去が行なわれて一連の複写処理工程が終
了して、次の複写に備えられる。On the other hand, after the transfer, the photoreceptor 1 passes under the exposure device 3 on which the light beam is not projected, is neutralized by the charger 4, and the remaining developer is removed by the cleaning member 6 that comes into contact with the surface of the photoreceptor 1 again. This completes a series of copy processing steps and prepares for the next copy.
この複写機において、感光体１とスクイズローラ７との
間隙Ｇは、複写性能に大きな影響をおよぼす。In this copying machine, the gap G between the photoreceptor 1 and the squeeze roller 7 has a large effect on copying performance.
すなわち、前記の間隙Ｇが大きいと、スクイズローラ７
の液切り関始時点における液切りが悪く、そのため感光
体１の画像形成領域の前方に現像液付着量の多い部分が
できてしまう。That is, if the gap G is large, the squeeze roller 7
The liquid draining at the beginning of the liquid draining process is poor, resulting in a portion of the photoreceptor 1 in front of the image forming area where a large amount of developer adheres.
この現像液は量が多いから感光体の表面を伝わって自然
に流下するとともに、帯電器２の下を通過したときにそ
の帯電器２（安定した転写効果を発揮するため、転写紙
が送られて来る前から放電状態になっている。Since this developer has a large amount, it naturally flows down the surface of the photoreceptor, and when it passes under the charger 2, the transfer paper is fed to the charger 2 (in order to achieve a stable transfer effect). It has been in a discharge state even before it arrived.
）によって電気的に後流側へ引き寄せられる力が作用し
て、現像液の流下を助長し、その結果、転写紙の先端部
に多量の現像液が付着してしまうことがある。), a force that electrically draws the developer to the downstream side acts, promoting the flow of the developer, and as a result, a large amount of the developer may adhere to the leading edge of the transfer paper.
このようなことが起こらないようにするために、スクイ
ズ開始位置から画像形成領域までの距離を長くして、現
像液が流下してもそれが転写紙に付着しないようにする
ことが考えられる。In order to prevent this from happening, it is conceivable to increase the distance from the squeeze start position to the image forming area so that even if the developer flows down, it does not adhere to the transfer paper.
ところが感光体表面における画像形成領域は最大複写サ
イズによって決められているから、スクイズ開始位置か
ら画像形或領域までの距離を長くするには、感光体を大
きくする必要がある。However, since the image forming area on the surface of the photoreceptor is determined by the maximum copy size, it is necessary to increase the size of the photoreceptor in order to increase the distance from the squeeze start position to a certain image area.
そのために複写機が大型となり、しかも所定の複写処理
速度を確保するためには延長した長さ分だけ感光体の周
速度を速くする必要がある。This increases the size of the copying machine, and in order to ensure a predetermined copy processing speed, it is necessary to increase the circumferential speed of the photoreceptor by the length of the extension.
一方、感光体１とスクイズローラ７との間隙Ｇを可及的
に小さくすれば、液切り開始時点においても良好な液切
りか行なわれるが、感光体１への現像液の付着量が少な
くなり過ぎて画像濃度が低下する。On the other hand, if the gap G between the photoreceptor 1 and the squeeze roller 7 is made as small as possible, good liquid removal can be performed even at the start of liquid removal, but the amount of developer that adheres to the photoreceptor 1 will be reduced. If the image density is too high, the image density will decrease.
また感光体１とスクイズローラ７との位置精度のばらつ
きによっては、両者が完全に接触してしまうことがある
。Further, depending on variations in positional accuracy between the photoreceptor 1 and the squeeze roller 7, the two may come into complete contact.
従って感光体１とスクイズローラ７との位置精度を厳密
に管理する必要があり、そのために作業性の低下や実質
的なコストアップを招く。Therefore, it is necessary to strictly control the positional accuracy between the photoreceptor 1 and the squeeze roller 7, which leads to a decrease in work efficiency and a substantial increase in costs.
本発明の目的は、前記した従来技術の欠点を解消し、複
写性能の良好な湿式電子写真複写機を提供するにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a wet-type electrophotographic copying machine with good copying performance.
この目的を達成するため、本発明は、′感光体の近傍に
その感光体の進行方向に沿って、静電潜像を形成した感
光体表面に現像液を付着する現像部と、前記潜像が形成
されるべき感光体表面に対して離接可能に配置されたク
リーニング部材と、感光体表面に付着した現像液のうち
余剰なものを感光体から取り除くために感光体に対し微
小間隙を介して設けられた例えばスクイズローラなどの
余剰付着現像液除去部材とを所定の間隔をおいて設置し
、感光体のほぼ２回転中に一連の複写処理工程が行なわ
れる湿式電子写真複写機において、前記感光体の被記録
体に転写されるべき画像を形成するための画像形成領域
の感光体進行方向前方に、前記余剰付着現像液除去部材
との間隙を実質的に狭めるための帯電・現像による現像
液付着部を形成する手段を有し、この手段によって感光
体の画像形成領域の前方に現像液付着部を形戒して、液
切り開始時点における現像液の多量付着を阻止したこと
を特徴とする。In order to achieve this object, the present invention provides: a developing section that applies a developer to the surface of the photoreceptor on which an electrostatic latent image has been formed in the vicinity of the photoreceptor along the traveling direction of the photoreceptor; a cleaning member disposed so as to be separable from the surface of the photoreceptor on which the photoreceptor is to be formed; In a wet-type electrophotographic copying machine in which a series of copy processing steps are performed during approximately two rotations of a photoreceptor, a surplus developer removing member such as a squeeze roller is installed at a predetermined interval. Development by charging and development to substantially narrow the gap between the excess adhering developer removing member and the image forming area in front of the photoreceptor in the direction of travel of the photoreceptor for forming an image to be transferred to the recording medium of the photoreceptor. The present invention is characterized in that it has a means for forming a liquid adhesion part, and this means forms a developer adhesion part in front of the image forming area of the photoreceptor, thereby preventing a large amount of developer from adhering at the time of starting draining. do.
次に本発明の実施例を第２図および第３図とともに説明
する。Next, an embodiment of the present invention will be described with reference to FIGS. 2 and 3.
第２図｛ｇおいて、ドラム形感光体１の表面に現像液が
付着していない状態での感光体１とスクイズローラ７と
の間隙Ｇは、画像濃度の低下がなく感光体１にスクイズ
ローラ７が接触する危険性がない程度に設計されている
。In Fig. 2 {g, the gap G between the photoconductor 1 and the squeeze roller 7 when no developer is attached to the surface of the drum-shaped photoconductor 1 is such that the gap G between the photoconductor 1 and the squeeze roller 7 is such that it can squeeze the photoconductor 1 without reducing the image density. The design is such that there is no risk of the rollers 7 coming into contact with each other.
感光体１の表面には、前述のように所定の帯電、露光、
現像によって転写紙などの被記録体に転写されるべき画
像１２が形或されるが、この画像形或領域１３の感光体
進行方向前方には、帯電・現像によって現像液付着部１
４が形或される。As mentioned above, the surface of the photoreceptor 1 is charged with a predetermined amount, exposed to light,
An image 12 to be transferred to a recording medium such as a transfer paper is formed by development, and in front of this image area 13 in the direction in which the photoreceptor travels, a developer adhering portion 1 is formed by charging and development.
4 is formed.
この現像液付着部１４は第３図に示すように、前段で感
光体表面の除電とクリーニングをした後、原稿画像（被
記録体に転写されるべき画像１２）が形成される時点よ
り早いタイミングで帯電と現像を行なうことにより、黒
またはハーフトーンの現像液付着部１４が形成される。As shown in FIG. 3, this developing solution adhesion section 14 is formed at a timing earlier than the time when the original image (the image 12 to be transferred to the recording medium) is formed after the surface of the photoreceptor has been neutralized and cleaned in the previous stage. By performing charging and development, a black or halftone developer-applied portion 14 is formed.
従って帯電・現像の開始時点と原稿画像の形成開始時点
とのタイミングの差，ＪＴと感光体１の周速度との関係
で、現体液付着部１４の形成領域が決まる。Therefore, the formation area of the developer liquid adhering portion 14 is determined by the difference in timing between the start of charging and development and the start of forming an original image, and the relationship between JT and the circumferential speed of the photoreceptor 1.
この実施例では帯電・現像の開始時点から原稿画像の形
成開始時点まで連続して現像液付着部１４を設けたが、
現像液付着部１４を部分的に形或して、画像形成領域１
３と現像液付着部１４とを離すこともできる。In this embodiment, the developer adhering portion 14 was provided continuously from the start of charging and development to the start of forming the document image.
The image forming area 1 is formed by partially shaping the developer adhering portion 14.
3 and the developer adhering portion 14 can also be separated.
感光体１がドラム形のようにエンドレスのものにおいて
は、現像液付着部１４が画像形成領域１３の後端とラッ
プしないように注意する必要がある。When the photoreceptor 1 is endless, such as a drum-shaped photoreceptor, care must be taken to prevent the developer adhering portion 14 from wrapping with the rear end of the image forming area 13.
帯電・現像によって形成された現像液付着部１４がクリ
ーニング部材６の位置に到達する前に、クリーニング部
材６は感光体１から離れている。The cleaning member 6 is separated from the photoreceptor 1 before the developer adhering portion 14 formed by charging and development reaches the position of the cleaning member 6 .
そして現像液付着部１４がスクイズローラ７の下を通過
する際、この現像液付着部１４によってスクイズローラ
７との間隙Ｇ０か実質的に狭くなる。When the developer adhering portion 14 passes under the squeeze roller 7, the gap G0 between the developer adhering portion 14 and the squeeze roller 7 becomes substantially narrower.
帯電・現像によって形戒される現儂液付着部１４の厚さ
は１０μｍ程度であるから、例えば感光体１とスクイズ
ローラ７との間隙Ｇを３０μｍに設定しておけば、スク
イズローラ７による液切り開始時点、すなわち現像液付
着部１４の先端部がスクイズローラ７の下を通過すると
きには、約２０μｍの間隙Ｇｔになっている。Since the thickness of the liquid adhering portion 14 formed by charging and development is about 10 μm, for example, if the gap G between the photoreceptor 1 and the squeeze roller 7 is set to 30 μm, the liquid applied by the squeeze roller 7 can be At the start of cutting, that is, when the tip of the developer adhering portion 14 passes under the squeeze roller 7, the gap Gt is approximately 20 μm.
このように現像液付着部１４によって、スクイズローラ
７との間隙を実質的に狭くすることができ、従って液切
り開始時点における液切り効果がシャープになり、従来
のように現像液が部分的に多量に付着することがない。In this way, the gap with the squeeze roller 7 can be substantially narrowed by the developer adhering portion 14, so that the liquid draining effect at the start of draining becomes sharper, and the developer is partially drained unlike the conventional method. Does not adhere in large quantities.
本発明は前述のような構成になっており、感光体とスク
イズローラなどの余剰付着現像液除去部材との間隙を、
画像濃度の低下や感光体と余剰付着現像液除去部材とが
接触する危険性がない程度に設計していても、液切り開
始時点の液切り効果が良好になり、余分の現像液が被記
録体に付着するようなことが解消され、複写性能の向上
が図れる。The present invention has the above-mentioned structure, and the gap between the photoreceptor and the excess developer removing member such as a squeeze roller is
Even if the design is such that there is no risk of a decrease in image density or contact between the photoreceptor and the excess developer removal member, the draining effect at the start of draining will be good and excess developer will be removed from the recording. The problem of adhesion to the body is eliminated, and copying performance can be improved.
第１図は湿式電子写真複写機の概略構戒図、第２図は本
発明の実施例に係る湿式電子写真複写機の要部概略構成
図、第３図はその複写機のタイミングチャートである。
１・・・・・・感光体、５・・・・・・現像部、６・・
・・・・クリーニング部材、７・・・・・・スクイズロ
ーラ、１０・・・・・・現像液、１２・・・・・・被記
録体に転写されるべき画像、１３・・・・・・画像形成
領域、１４・・・・・・現像液付着部、Ａ・・・・・・
感光体の回転進行方向、Ｇ，Ｇ１・・・・・・間隙。FIG. 1 is a schematic diagram of the structure of a wet-type electrophotographic copying machine, FIG. 2 is a schematic diagram of the main parts of a wet-type electrophotographic copying machine according to an embodiment of the present invention, and FIG. 3 is a timing chart of the copying machine. . 1...Photoreceptor, 5...Developing section, 6...
... Cleaning member, 7 ... Squeeze roller, 10 ... Developer, 12 ... Image to be transferred to recording medium, 13 ...・Image forming area, 14...Developer adhesion area, A...
Rotation direction of photoreceptor, G, G1... Gap.
Claims (1)
電潜像を形成した感光体表面に現像液を付着する現像部
と、前記潜像が形成されるべき感光体表面に対して離接
可能に配置されたクリーニング部材と、感光体表面に付
着した現像液のうち余剰なものを感光体から取り除くた
めに感光体に対し徴小間隙を介して設けられた余剰付着
現像液除去部材とを所定の間隔をおいて設置し、感光体
のほぼ２回転中に一連の複写処理工程が行なわれる湿式
電子写真複写機において、前記感光体の被記録体に転写
されるべき画像を形成するための画像形成領域の感光体
進行方向前方に、前記余剰付着現像液除去部材との間隙
を狭めるための帯電・現像による現像液付着部を形成す
る手段を有することを特徴とする湿式電子写真複写機。1. A developing section that applies a developer to the surface of the photoreceptor on which an electrostatic latent image has been formed in the vicinity of the photoreceptor along the traveling direction of the photoreceptor; a cleaning member disposed so as to be separable; and an excess developer removal member provided with a small gap to the photoreceptor in order to remove excess developer adhering to the surface of the photoreceptor from the photoreceptor. In a wet-type electrophotographic copying machine in which a series of copying processes are performed during approximately two rotations of a photoreceptor, an image to be transferred to a recording medium of the photoreceptor is formed. Wet type electrophotographic copying, characterized in that it has means for forming a developer adhering portion by charging and developing to narrow the gap with the excess adhering developer removing member, in front of the image forming area in the photoreceptor traveling direction. Machine.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54155562A JPS5837540B2 (en) | 1979-12-03 | 1979-12-03 | Wet electrophotographic copying machine |
| US06/207,999 US4373800A (en) | 1979-12-03 | 1980-11-18 | Wet type electrophotographic copying machine |
| DE3045630A DE3045630C2 (en) | 1979-12-03 | 1980-12-03 | Electrophotographic wet copier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54155562A JPS5837540B2 (en) | 1979-12-03 | 1979-12-03 | Wet electrophotographic copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5678860A JPS5678860A (en) | 1981-06-29 |
| JPS5837540B2 true JPS5837540B2 (en) | 1983-08-17 |
Family
ID=15608761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54155562A Expired JPS5837540B2 (en) | 1979-12-03 | 1979-12-03 | Wet electrophotographic copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5837540B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61277032A (en) * | 1985-05-31 | 1986-12-08 | Mitsui Eng & Shipbuild Co Ltd | Tensile-testing method |
| JPH0222683Y2 (en) * | 1983-06-27 | 1990-06-19 |
-
1979
- 1979-12-03 JP JP54155562A patent/JPS5837540B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0222683Y2 (en) * | 1983-06-27 | 1990-06-19 | ||
| JPS61277032A (en) * | 1985-05-31 | 1986-12-08 | Mitsui Eng & Shipbuild Co Ltd | Tensile-testing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5678860A (en) | 1981-06-29 |
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