JPS6012567A - Developing device - Google Patents

Abstract

PURPOSE:To prevent the wet due to an excessive developer on the surface of a medium to be recorded, by constituting so that the medium to be recorded comes to a standstill when an image formation is completed, by a three-way valve provided on a liquid feed pipe between a liquid feed port of a developing body part and a developer tank, and also a feed of a developer is stopped temporarily when a developing operation is not executed. CONSTITUTION:As soon as an image formation to a medium to be recorded 1 is completed, a three-way valve 7 closes automatically a liquid feed pipe 6 between a liquid feed port 2a' of a developing body part 2 and a developer tank 4, by an image formation completing signal from the outside, cuts off a developer 5 in the liquid feed pipe 6, and simultaneously, the liquid feed port 2a' of the developing body part 2 communicates to a discharge port 7c of the three-way valve 7, and by a continuous operation of a suction pump 3, the sucking action operates althrough the liquid feed side is cut off. Accordingly, an air (a) from the outside is sucked from an uneven layer of a contact surface of the developing body part 2 and the medium to be recorded 1, and simultaneously, the residual developer 5 of a liquid feeding groove 2a of the developing body part 2, and the excessive developer 5 adhering to the medium to be recorded 1 and having no electrostatic attraction are removed quickly in the directions as indicated with arrows C, B and E from both sides of the liquid feed port 2a' and a liquid discharge port 2a'', and in the end, an air layer is formed, and the wet or contamination on the surface of the medium to be recorded 1 is eliminated completely.

Description

【発明の詳細な説明】 本発明は現像液タンクより現像体部に現像液を供給して
この現像体部により被記録媒体に作画する現像装置にお
いて、特に前記被記―媒体の地温れや汚れを防止するた
めの改良に関するものである◎以下、図面に基づき本発
明の詳細な説明する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a developing device that supplies a developer from a developer tank to a developer section and uses this developer section to form an image on a recording medium. ◎The present invention will be described in detail below based on the drawings.

第１図は現像装置の現像体部の被記録媒体を仮想線で示
した平面図である。第２図は従来の現像装置で現像体部
の一部を欠截して示す第１図１−！線に沿った要部縦断
面図、第３図は第２図の現像体部を拡大した作画完了時
の現像液と被記録媒体との状態を説明するための第１図
１１線に沿った要部断面説明図である。なお第２図およ
び第３図の給液管と排液管は断面で示している。　“乃 第１図及至第３図において、ｌは現像体部２との接触面
が凹凸（約１０μｍ）層を有している被記録媒体である
。この現像体部２の土間長手方向に、現像液５が通過す
る給液用溝２ａと排液用溝２ｂが並Ｐ３ 列して設けられている０給液用溝２ａの給液側には給液
管６と連通する給液口２ａ’が、排液側には排液管６ｂ
と連通ずる排液口２ａ’がそれぞれ穿設されている◎排
液用溝２ｂは、被記録媒体１に作画を完了すると、この
被記録媒体１に付着した静電吸着のない余分の現像液を
吸引回収するための溝である。FIG. 1 is a plan view showing a recording medium in a developing body portion of a developing device using imaginary lines. FIG. 2 shows a conventional developing device with a part of the developing body section cut away as shown in FIG. 1-! FIG. 3 is an enlarged view of the developing body shown in FIG. 2, taken along the line 11 in FIG. It is an explanatory view of a main part. Note that the liquid supply pipe and the liquid drain pipe in FIGS. 2 and 3 are shown in cross section. 1 to 3, l is a recording medium whose contact surface with the developer section 2 has an uneven (approximately 10 μm) layer.In the longitudinal direction of the dirt floor of the developer section 2, The liquid supply groove 2a, through which the developer 5 passes, and the drain groove 2b are arranged in parallel P3 rows.On the liquid supply side of the liquid supply groove 2a, there is a liquid supply port 2a communicating with the liquid supply pipe 6. ', but the drain pipe 6b is on the drain side.
◎Drainage grooves 2b are provided with drainage ports 2a' that communicate with the recording medium 1.When printing is completed on the recording medium 1, the excess developer that has not been electrostatically attracted to the recording medium 1 is removed from the drainage grooves 2b. This is a groove for suctioning and collecting.

この排液用溝２ｂの中央部には、排液管６ａと連通ずる
排液口２ｂ’が穿設されている。３は排液管６ｂに設け
られた吸込ポンプ、４は吸込ポンプ３に連通した排液管
６ｃから吐出される現像液５を溜め、かつ、この現像液
５を現像体部２へ給液するための現像液タンクである◇
ａは現像体部２と被記録媒体１との接触部分かられずか
に吸い込まれる空気を示している。A drain port 2b' that communicates with the drain pipe 6a is bored in the center of the drain groove 2b. Reference numeral 3 denotes a suction pump provided in the drain pipe 6b, and 4 stores the developer 5 discharged from the drain pipe 6c communicating with the suction pump 3, and supplies this developer 5 to the developer unit 2. It is a developer tank for ◇
A indicates air that is slightly sucked in from the contact portion between the developer section 2 and the recording medium 1.

このような構成の現像装置において、吸込ポンプ３によ
り現像液タンク４から給液管６を介して矢印Ａ方向に吸
引された現像液５は、現像体部２に設けられた給液用溝
２ａを通過して排液口２ａ“を経て排液管６ｂの矢印Ｃ
方向に吸引されるが、この給液用ｆＪ４２ａの上面を通
過する被記録媒体１（例えば静電記録用紙）の表面１ζ
作画のための負電圧が印加されている場合、正電荷を与
えられている現像液５が静電吸着し、更に排液用溝２ｂ
にて被記録媒体１面上の静電吸着のない余分な現像液５
は排液口２「および排液管６ａを介して矢印Ｂ方向１こ
吸込ポンプ３の吸引力により吸いとられる。この余分な
現像液５は排液管６ｂｊこ合流され吸込ポンプ３．排液
管６ｃを介して矢印り方向の現像液タンク４に還元され
る。この場合、第３図に示すごとく作画完了後は現像体
部２の上面に被記録媒体１が静止し、給液用溝２ａには
現像液５が充満しているため、どうしても被記録媒体ｌ
の表面が濡れた状態で付着し作画面を汚してしまう欠点
を有していた０特に減法三原色（シアン色、マゼンタ色
、イエロー色）重ね合せ方式によるカラー作画の場合は
被記録媒体１が給液用溝２ａ面を数回にわたって往復す
るので、前述したように被記録媒体１の表面に現像液５
の濡れが全体に広がり鮮明なカラー作画ができず、更に
は現像体部２への各色の付着１ζよる汚れを防止するた
めに常にこの周辺の部品を５ 清掃してからでなければ次回の作画ができなかった０ 本発明は上述したような欠点に鑑みてなされたもので、
現像体部の給液口と現像液タンクの間の給液管に三方弁
を配設し、作画完了時に被記録媒体が静止し、または現
像動作をしないときは、この三方弁により現像液の給液
を一時停止させることにより、被記録媒体表面での余分
な現像液による濡れを防止する現像装置を提供せんとす
るものである０ 以下、本発明を実施例を図面に基づいて説明する。第４
図は本発明における一実施例の現像装置で現像体部の一
部を欠截して示す第１図Ｉ−１線に沿った要部縦断面図
、第５図は第４図の現像体部を拡大した作画完了時の現
像液と被記録媒体との状態を説明するための第１図ト」
線に沿った要部断面説明図である。図中、第１図及至第
３図と同一符号は同一または相当部分である。また給液
管および排液管は断面で示している０第４図および第５
図において、７は三方弁で、Ｐに の三方弁７の設置位置は現像体部２の給液口２１と現像
液タンク４の間の給液管６の所定位置に配設し、三方弁
７の排出ロアｃは排液管６ｄと連通し、更に該排液管６
ｄは排液管６ｂと連通している。被記録媒体１への作画
が完了すると同時に外部よりの作画完了信号（図示せず
）により、三方弁７は自動的に現像体部２の給液口２ａ
’と現像液タンク４の間の給液管６を閉じて、給液管６
内の現像液５を遮断すると同時に、現像体部２の給液口
２ｍ’は三方Ｉ飼 弁７の排出ロアＣに連通し、吸込ポンプ３の継続可動に
より、給液側は遮断されている１こもかかわらず吸い込
み作用が働らいているので、現像体部２と被記録媒体１
の接触量の凹凸層より外部からの空気ａを吸い込みなが
ら同時に現像体部２の給液用溝２ａの残留した現像液５
および被記録媒体１に付着した静電吸着のない余分な現
像液５は、給液口２ｊと排液口２ａ＃の両側より矢印Ｃ
，ＢおよびＥ方向に急速に除去され、ついには空気層を
形成しこれによって従来の現像装置のように給液用溝２
ａｌζ現像液５が静止状態で充満することなく、かつ被
、　Ｐ７ 記録媒体１表面の濶れまたは汚れが完全に解消させるこ
とができる。In the developing device having such a configuration, the developer 5 sucked in the direction of arrow A from the developer tank 4 by the suction pump 3 through the supply pipe 6 is transferred to the supply groove 2a provided in the developer section 2. through the drain port 2a'' and the arrow C of the drain pipe 6b.
The surface 1ζ of the recording medium 1 (for example, electrostatic recording paper) passes through the upper surface of this liquid supply fJ42a.
When a negative voltage for image creation is applied, the positively charged developer 5 is electrostatically attracted to the drain groove 2b.
Excess developer solution 5 without electrostatic adsorption on one surface of the recording medium
is sucked away by the suction force of the suction pump 3 in the direction of arrow B through the drain port 2 and the drain pipe 6a. The developer is returned to the developer tank 4 in the direction of the arrow through the pipe 6c.In this case, as shown in FIG. 2a is filled with the developer 5, so it is inevitable that the recording medium l
In particular, in the case of color printing using the subtractive primary color (cyan, magenta, and yellow) superimposition method, the recording medium 1 has the disadvantage of adhering to the surface when wet and staining the drawing surface. Since the liquid groove 2a surface is reciprocated several times, the developer 5 is applied to the surface of the recording medium 1 as described above.
The wetness spreads over the whole area, making it impossible to print in clear color.Furthermore, in order to prevent stains caused by the adhesion of each color to the developing body 2, the surrounding parts must be cleaned before the next drawing. The present invention was made in view of the above-mentioned drawbacks.
A three-way valve is installed in the liquid supply pipe between the liquid supply port of the developer unit and the developer tank, and when the recording medium is stationary when printing is completed or there is no developing operation, this three-way valve turns off the developer. DESCRIPTION OF THE PREFERRED EMBODIMENTS An object of the present invention is to provide a developing device that prevents the surface of a recording medium from being wetted by excess developer by temporarily stopping the supply of liquid. Fourth
The figure is a longitudinal cross-sectional view of the main part of a developing device according to an embodiment of the present invention, taken along the line I-1 in Figure 1 with a part of the developing body portion cut away, and Figure 5 is the developing body shown in Figure 4. Figure 1 shows an enlarged view of the state of the developer and the recording medium upon completion of printing.
FIG. 2 is a cross-sectional explanatory diagram of a main part taken along a line. In the figure, the same reference numerals as in FIGS. 1 to 3 indicate the same or corresponding parts. The liquid supply pipe and drain pipe are shown in cross section in Figures 4 and 5.
In the figure, 7 is a three-way valve, and the installation position of the three-way valve 7 at P is a predetermined position of the liquid supply pipe 6 between the liquid supply port 21 of the developer section 2 and the developer tank 4. The discharge lower c of 7 communicates with the drain pipe 6d, and further connects the drain pipe 6 to the drain pipe 6d.
d communicates with the drain pipe 6b. At the same time as the image formation on the recording medium 1 is completed, the three-way valve 7 automatically closes the liquid supply port 2a of the developer section 2 in response to an external image formation completion signal (not shown).
' Close the liquid supply pipe 6 between the developer tank 4 and the liquid supply pipe 6.
At the same time, the liquid supply port 2m' of the developer body part 2 is communicated with the discharge lower C of the three-way I feed valve 7, and the liquid supply side is blocked by the continuous operation of the suction pump 3. 1. However, since the suction action is still working, the developing body 2 and the recording medium 1
While sucking in air a from the outside through the uneven layer with a contact amount of
The excess developer 5 that has not been electrostatically attracted to the recording medium 1 is removed from both sides of the liquid supply port 2j and the liquid drain port 2a# by the arrow C.
, B and E directions, and finally forms an air layer, which opens the liquid supply groove 2 like in a conventional developing device.
The alζ developer 5 does not fill up in a stationary state, and it is possible to completely eliminate dripping or staining on the surface of the recording medium 1.

特に前述したように減法三原色重ね合せ方式によるカラ
ー作画の場合は本発明を採用することにより、被記録媒
体１が数回に亘って現像体部２面上を往復しても余分な
現像液５による被記録媒体１の濡れもなく、シたがって
現像体部２の周辺部品も汚すことがないので、次回色の
ための電圧印加もスムーズに行うことができる◎更１こ
Ａｏ　、　ＡＩサイズ等の用紙サイズが大きな被記録媒
体１に記録する場合、現像体部２の給液用溝２ａは長い
ものとなり、給液用溝２ａに残留する現像液５の量はか
なりのもの化なるが、本発明は給液用溝２ａの給液口２
ａ’と排液口２ａ’の両方から現像液５を吸収するので
、短時間で現像液５を除去できる。Particularly in the case of color printing using the subtractive three-primary color superimposition method as described above, by adopting the present invention, even if the recording medium 1 moves back and forth over the surface of the developer section 2 several times, excess developer 5 can be removed. Since the recording medium 1 does not get wet due to the wetting of the recording medium 1 and therefore the surrounding parts of the developer section 2 are not contaminated, the voltage application for the next color can be performed smoothly. When recording on a recording medium 1 having a large paper size, the liquid supply groove 2a of the developer section 2 becomes long, and the amount of developer 5 remaining in the liquid supply groove 2a becomes considerable. The present invention provides a liquid supply port 2 of a liquid supply groove 2a.
Since the developer 5 is absorbed from both a' and the drain port 2a', the developer 5 can be removed in a short time.

上述したごとく本発明による現像装置は被記録媒体に余
分な現像液の付着による濡れ、汚れが完全に解消され、
汚れのための再作画や周辺部品の清掃もなくなったこと
により、日常管理が容易で両値のよい作画が安定して得
られるのでその実用上の効果は多大である。As described above, the developing device according to the present invention completely eliminates wetting and staining caused by excess developer adhering to the recording medium.
Since there is no need to redraw images due to dirt or to clean peripheral parts, daily management is easy and images with good values in both values can be stably obtained, which has great practical effects.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は現像装置の現像体部の被記録媒体を仮想線で示
した平面図、第２図は従来の現像装置で現像体部の一部
を欠載して示す第１図１−１線に沿った要部縦断面図、
第３図は第２図の現像体部を拡大した作画完了時の第１
図Ｉ−１線に沿った要部断面説明図、第４図は本発明に
おける一実施例の現像装置で現像体部の一部を欠載して
示す第１図１−１線に沿った要部縦断面図、第５図は第
４図の現像体部を拡大した作画完了時の第１図■−Ｕ線
に沿った要部断面説明図である０１・・・・・被記録媒
体、２・・・・・現像体部、２ａ・・・・・・給液用溝
、２ｂ・・・・排液用溝、２ａ′・・・・・・給液口、
２ａ“、２ｂ′・・・・・排液口、３・・・・・吸込ポ
ンプ、４・・・・・現像液タンク、５・・・・・現像液
、６・・・・・給液管、　６ａ　、　６ｂ　、　６ｃ　
。 ６ｄ・・・・・・排液管、７・・・・・三方弁、７ａ・
・・・・・三方弁供給口、７ｂ・・・・三方弁出口、７
ｃ・・・・・・三方弁排出口◇為ｌ　口 ■ 一２五 寸・ 為３図 第４図 ５　毛、５図Fig. 1 is a plan view showing the recording medium in the developing body portion of the developing device using imaginary lines, and Fig. 2 is a plan view showing a conventional developing device with a portion of the developing body portion missing. Longitudinal cross-sectional view of the main part along the line,
Figure 3 is an enlarged view of the developing body shown in Figure 2.
FIG. 4 is an explanatory cross-sectional view of the main part taken along the line I-1, and FIG. 01...Recording medium , 2...Developer section, 2a...Liquid supply groove, 2b...Drainage groove, 2a'...Liquid supply port,
2a", 2b'...Drain port, 3...Suction pump, 4...Developer tank, 5...Developer, 6...Liquid supply tube, 6a, 6b, 6c
. 6d... Drain pipe, 7... Three-way valve, 7a...
...Three-way valve supply port, 7b...Three-way valve outlet, 7
c...Three-way valve outlet ◇ Tame l mouth ■ 125 inches / Figure 3 Figure 4 Figure 5 Hair, Figure 5

Claims (1)

【特許請求の範囲】 現像液タンクより給液管を介し現像体部に現像液を供給
して該現像体部ζζより被記録媒体に作画し、前記現像
体部排液口に連通する排液管に配設された吸込ポンプな
どにより前記現像体部の現像液を吸込み再び前記現像液
タンクに戻して循環させる現像装置において、前記現像
体部の給液口と前記現像液タンクの間の給液管に三方弁
を設け、該三方弁の供給口に前記現像液タンクよりの給
液管を、前記三方弁出口に前記現像体部給液口よりの給
液管を、前記三方弁排出口に排液管をそれぞれ連結し、
前記三方弁を作画完了と同時に前記現像液タンクと現像
体部間の給液管管路を閉路すると共に、前記現像体部給
液口よりの給液管が前記三方弁排出口に連結された排液
管管路に開略し、前記吸込ポンプを継続して作動させて
前記現像液Ａ寸 と空気を吸引せしめ前記被記録媒体の表面に不着２ した余分な現像液を吸い取るように構成したことを特徴
とする現像装置。[Scope of Claims] A developer is supplied from a developer tank to a developer section through a supply pipe, an image is formed on a recording medium from the developer section ζζ, and a drain fluid is communicated with a drain port of the developer section. In a developing device in which a suction pump or the like disposed in a pipe sucks the developer in the developer body and returns it to the developer tank for circulation, a supply between the developer body part's fluid supply port and the developer tank is provided. A three-way valve is provided in the liquid pipe, a liquid supply pipe from the developer tank is connected to the supply port of the three-way valve, a liquid supply pipe from the developer unit liquid supply port is connected to the outlet of the three-way valve, and a liquid supply pipe from the developer unit liquid supply port is connected to the three-way valve outlet. Connect the drain pipes to the
At the same time as the three-way valve completes drawing, the liquid supply pipe line between the developer tank and the developer body is closed, and the liquid supply pipe from the developer body liquid supply port is connected to the three-way valve outlet. A drain pipe is opened and the suction pump is continuously operated to suction the developer solution A and air, thereby sucking up excess developer that has not adhered to the surface of the recording medium. A developing device characterized by: