EP0018494B1 - Device for wetting electrophotographic material - Google Patents

Device for wetting electrophotographic material Download PDF

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Publication number
EP0018494B1
EP0018494B1 EP80101538A EP80101538A EP0018494B1 EP 0018494 B1 EP0018494 B1 EP 0018494B1 EP 80101538 A EP80101538 A EP 80101538A EP 80101538 A EP80101538 A EP 80101538A EP 0018494 B1 EP0018494 B1 EP 0018494B1
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EP
European Patent Office
Prior art keywords
rollers
application
tube
pair
copying material
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
Application number
EP80101538A
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German (de)
French (fr)
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EP0018494A1 (en
Inventor
Bernd Dr. Jost
Lüto Röhrig
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Hoechst AG
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Hoechst AG
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Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0018494A1 publication Critical patent/EP0018494A1/en
Application granted granted Critical
Publication of EP0018494B1 publication Critical patent/EP0018494B1/en
Expired legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer

Definitions

  • the invention relates to a device for pre-moistening electrophotographic copy material bearing a latent image, which is subsequently developed, by guiding the material through a system provided with pairs of inlet and outlet rollers.
  • the solution to this problem is based on a device for pre-moistening electrophotographic copying material bearing a latent image, which is subsequently developed, by guiding the material through a system provided with pairs of inlet and outlet rollers. It is characterized in that, in the region of the lower rollers, it contains a plastic fabric, in particular a screen printing fabric, which is adjustable at a distance from the line L defined by the apexes of the roller pairs, as the guide element over the level of which there is an opening provided with openings on its end faces pure application liquid fed, adjustable in distance to the line L and below whose level there is a damming element in the application area, and that it contains an arrangement which feeds the pure developer liquid back to the application pipe via a collecting trough and a liquid tank.
  • the application tube is a plastic tube provided with a slot.
  • image copies can be made available which are practically groundless and have good contrast.
  • the device is simple in design and has a high throughput speed due to its guidance in one level.
  • the connected developing device can have the same design as the device for pre-moistening.
  • the invention is explained in more detail below using an exemplary embodiment in conjunction with the accompanying drawing.
  • the drawing shows a cross section of the device according to the invention.
  • the latent image-bearing copy material 2 is introduced into the pre-moistening device.
  • the copying material can be in sheet or web form.
  • the material is pre-moistened by supplying liquid from the outlet openings 4 of pure developer liquid 12 from the application tube 5 to the image side.
  • the material is guided through the guide element 6, which consists of a plastic fabric, preferably a screen printing fabric, which is prestressed by the clamping bolt 7.
  • the entire guide element 6 is arranged so as to be adjustable in the direction 9, preferably in such a way that the guide plane of the guide element is below the apexes of the inlet and outlet rollers.
  • the copying material is introduced into the subsequent developing device 13 through the pair of discharge rollers 10, 11, which has a gap setting which can vary depending on the thickness of the copying material, but which can generally be set in the range from approximately 0.2 to 1 mm. This is preferably constructed in the same construction as the claimed device for pre-moistening.
  • the application of the pure developer liquid 12 for pre-moistening takes place through the openings 4 of the application tube 5, which in a preferred embodiment consists of a plastic tube.
  • the pure developer liquid is fed in at the end faces of the tube.
  • the openings can be in the form of bores or slots. However, the openings are preferably formed by a slot.
  • the application tube 5 is arranged so as to be adjustable and can be adjusted in the direction 17 towards the guide element 6 such that the distance between the outlet openings 4 and the surface of the continuous copying material is in a range of approximately 0.5 to 2.5 mm, preferably approximately 1 mm, lies.
  • the pure developer liquid appears evenly at the openings, for example Atmospheric pressure and after pre-moistening the copying material is collected in the drip pan 14 and returned to the application tube 5 in the circuit via the liquid tank 15 by means of a pump 16.
  • a high throughput speed of 10-25 m / min which can also be exceeded in some cases, is made possible.
  • Work is preferably carried out at throughput speeds in the range of 12-15 m / min.

Description

Die Erfindung betrifft eine Einrichtung zum Vorbefeuchten von ein latentes Bild tragendem, elektrophotographischem Kopiermaterial, das anschliessend entwickelt wird, durch Führen des Materials durch ein mit Ein- und Auslaufwalzenpaaren versehenes System.The invention relates to a device for pre-moistening electrophotographic copy material bearing a latent image, which is subsequently developed, by guiding the material through a system provided with pairs of inlet and outlet rollers.

Einrichtungen zur Flüssigentwicklung elektrophotographischer Kopiermaterialien sind bekannt. Bei ihrer Verwendung haben die erhaltenen Kopien oft unerwünschten grauen Grund, weil sich beim Durchlauf des Materials durch die Entwicklungseinrichtung auf dessen OberflächeTonerteilchen in Nichtbildbereichen festsetzen und nicht entfernt werden können.Devices for the liquid development of electrophotographic copying materials are known. When used, the copies obtained often have an undesirable gray background, because when the material passes through the developing device, toner particles settle on its surface in non-image areas and cannot be removed.

Es ist eine elektrostatische Nasstonereinrichtung bekannt, bei welcher das Kopiermaterial vor der Entwicklung durch eine klare Tonerlösung enthaltende Wanne und dann in die Entwicklerlösung geführt wird (DE-A Nr. 2047894). Es hat sich jedoch gezeigt, dass, bei relativ zufriedenstellender Grundentfernung, eine solche Einrichtung nicht für grosse Durchlaufgeschwindigkeiten geeignet ist, da die Führung des Materials nicht eindeutig eingestellt werden kann.An electrostatic wet toner device is known in which the copying material is passed through a trough containing clear toner solution and then into the developer solution prior to development (DE-A No. 2047894). However, it has been shown that, with a relatively satisfactory basic distance, such a device is not suitable for high throughput speeds, since the guidance of the material cannot be clearly set.

Es ist auch bekannt (DE-A Nr. 2046219), bei der Flüssigentwicklung elektrostatischer, latenter Bilder, die sich auf einem faserhaltigen Substrat befinden, so vorzugehen, dass vor der Entwicklung wenigstens die Seite, die sich der Bilderzeugungsseite gegenüber befindet, mit einer ersten Vorbadflüssigkeit und dann beide Seiten mit einer zweiten Vorbadflüssigkeit kontaktiert werden. Das Verfahren ist jedoch umständlich und wird praktischen Erfordernissen nicht gerecht.It is also known (DE-A No. 2046219) to proceed in the liquid development of electrostatic, latent images which are located on a fiber-containing substrate in such a way that, before development, at least the side which is opposite the image-forming side has a first Pre-bath liquid and then both sides are contacted with a second pre-bath liquid. However, the process is cumbersome and does not meet practical requirements.

Es war deshalb Aufgabe der vorliegenden Erfindung, eine mit einem flüssigen Entwickler arbeitende Einrichtung mit Vorbefeuchtung zu schaffen, die Kopien mit geringem Grund bzw. ohne Grund liefert und im Betrieb eine hohe Durchlaufgeschwindigkeit gewährleistet.It was therefore an object of the present invention to provide a device with pre-moistening which works with a liquid developer and which delivers copies with little or no reason and ensures a high throughput speed during operation.

Die Lösung dieser Aufgabe geht aus von einer Einrichtung zum Vorbefeuchten von ein latentes Bild tragendem, elektrophotographischem Kopiermaterial, das anschliessend entwickelt wird, durch Führen des Materials durch ein mit Ein- und Auslaufwalzenpaaren versehenes System. Sie ist dadurch gekennzeichnet, dass sie im Bereich der unteren Walzen ein im Abstand zu der durch die Scheitelpunkte der Walzenpaare definierten Linie L einstellbares Kunststoffgewebe, insbesondere ein Siebdruckgewebe, als Führungselement enthält, über dessen Ebene sich ein mit Öffnungen versehenes, von seinen Stirnseiten her mit reiner Entwicklerfiüssigkeit gespeistes, im Abstand zur Linie L einstellbares Antragsrohr und unter dessen Ebene sich im Antragsbereich ein Stauelement befindet, und dass sie eine Anordnung enthält, welche die reine Entwicklerflüssigkeit über eine Auffangwanne und einen Flüssigkeitstank dem Antragsrohr wieder zuführt. In bevorzugter Ausführung stellt das Antragsrohr ein mit einem Schlitz versehenes Kunststoffrohr dar.The solution to this problem is based on a device for pre-moistening electrophotographic copying material bearing a latent image, which is subsequently developed, by guiding the material through a system provided with pairs of inlet and outlet rollers. It is characterized in that, in the region of the lower rollers, it contains a plastic fabric, in particular a screen printing fabric, which is adjustable at a distance from the line L defined by the apexes of the roller pairs, as the guide element over the level of which there is an opening provided with openings on its end faces pure application liquid fed, adjustable in distance to the line L and below whose level there is a damming element in the application area, and that it contains an arrangement which feeds the pure developer liquid back to the application pipe via a collecting trough and a liquid tank. In a preferred embodiment, the application tube is a plastic tube provided with a slot.

Durch die Erfindung wird erreicht, dass Bildkopien zur Verfügung gestellt werden können, die praktisch grundfrei sind und guten Kontrast besitzen. Die Einrichtung ist einfach aufgebaut und besitzt durch das Führen in einer Ebene eine hohe Durchlaufgeschwindigkeit. Die angeschlossene Entwicklungsvorrichtung kann die gleiche Bauform besitzen wie die Einrichtung zum Vorbefeuchten.It is achieved by the invention that image copies can be made available which are practically groundless and have good contrast. The device is simple in design and has a high throughput speed due to its guidance in one level. The connected developing device can have the same design as the device for pre-moistening.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels in Verbindung mit der beiliegenden Zeichnung näher erläutert. Die Zeichnung zeigt einen Querschnitt der erfindungsgemässen Einrichtung.The invention is explained in more detail below using an exemplary embodiment in conjunction with the accompanying drawing. The drawing shows a cross section of the device according to the invention.

Durch das Einlaufwalzenpaar 1,2, das alsTransportwalzenpaar dient, wird das ein latentes Bild tragende Kopiermaterial 2 in die Vorbefeuchtungseinrichtung eingeführt. Das Kopiermaterial kann dabei sowohl blatt- als auch bahnförmig vorliegen. Die Vorbefeuchtung des Materials erfolgt durch Flüssigkeitszufuhr aus den Austrittsöffnungen 4 reiner Entwicklerflüssigkeit 12 aus dem Antragsrohr 5 auf die Bildseite. Das Material wird durch das Führungselement 6 geführt, welches aus einem Kunststoffgewebe, vorzugsweise einem Siebdruckgewebe, besteht, welches durch den Spannbolzen 7 vorgespannt wird. Unter dem Kunststoffgewebe im Antragsbereich befindet sich ein Stauelement 8, das die aus dem Antragsrohr 5 austretende Flüssigkeit kurz anstaut und somit die gesamte Fläche des durchlaufenden Kopiermaterials 3 gleichmässig vorbefeuchtet. Das gesamte Führungselement 6 ist in Richtung 9 einstellbar angeordnet, vorzugsweise so, dass sich die Führungsebene des Führungselements unterhalb der Scheitelpunkte der Ein- und Auslaufwalzen befindet. Das Kopiermaterial wird durch das Auslaufwalzenpaar 10,11, welches eine Spalteinstellung besitzt, die in Abhängigkeit von der Dicke des Kopiermaterials verschieden sein kann, im allgemeinen aber im Bereich von etwa 0,2 bis 1 mm einstellbar ist, in die anschliessende Entwicklungsvorrichtung 13 eingeführt. Diese ist vorzugsweise in gleicher Bauweise errichtet wie die beanspruchte Einrichtung zum Vorbefeuchten.Through the pair of inlet rollers 1, 2, which serves as a pair of transport rollers, the latent image-bearing copy material 2 is introduced into the pre-moistening device. The copying material can be in sheet or web form. The material is pre-moistened by supplying liquid from the outlet openings 4 of pure developer liquid 12 from the application tube 5 to the image side. The material is guided through the guide element 6, which consists of a plastic fabric, preferably a screen printing fabric, which is prestressed by the clamping bolt 7. Under the plastic fabric in the application area there is a damming element 8 which briefly accumulates the liquid emerging from the application tube 5 and thus pre-moistens the entire surface of the copying material 3 evenly. The entire guide element 6 is arranged so as to be adjustable in the direction 9, preferably in such a way that the guide plane of the guide element is below the apexes of the inlet and outlet rollers. The copying material is introduced into the subsequent developing device 13 through the pair of discharge rollers 10, 11, which has a gap setting which can vary depending on the thickness of the copying material, but which can generally be set in the range from approximately 0.2 to 1 mm. This is preferably constructed in the same construction as the claimed device for pre-moistening.

Der Antrag der reinen Entwicklerflüssigkeit 12 zum Vorbefeuchten geschieht durch die Öffnungen 4 des Antragsrohrs 5, welches in bevorzugter Ausführungsform aus einem Kunststoffrohr besteht. Der Zulauf der reinen Entwicklerflüssigkeit erfolgt an den Stirnseiten des Rohrs. Die Öffnungen können in Form von Bohrungen oder Schlitzen ausgeführt sein. Vorzugsweise jedoch werden die Öffnungen durch einen Schlitz gebildet. Das Antragsrohr 5 ist einstellbar angeordnet und kann in Richtung 17 auf das Führungselement 6 zu so justiert werden, dass der Abstand zwischen den Austrittsöffnungen 4 und der Oberfläche des durchlaufenden Kopiermaterials in einem Bereich von etwa 0,5 bis 2,5 mm, vorzugsweise etwa 1 mm, liegt. Die reine Entwicklerflüssigkeit tritt an den Öffnungen gleichmässig unter zum Beispiel Atmosphärendruck aus und wird nach Vorbefeuchten des Kopiermaterials in der Auffangwanne 14gesammelt und über den Flüssigkeitstank 15 mittels Pumpe 16 dem Antragsrohr 5 im Kreislauf wieder zugeführt.The application of the pure developer liquid 12 for pre-moistening takes place through the openings 4 of the application tube 5, which in a preferred embodiment consists of a plastic tube. The pure developer liquid is fed in at the end faces of the tube. The openings can be in the form of bores or slots. However, the openings are preferably formed by a slot. The application tube 5 is arranged so as to be adjustable and can be adjusted in the direction 17 towards the guide element 6 such that the distance between the outlet openings 4 and the surface of the continuous copying material is in a range of approximately 0.5 to 2.5 mm, preferably approximately 1 mm, lies. The pure developer liquid appears evenly at the openings, for example Atmospheric pressure and after pre-moistening the copying material is collected in the drip pan 14 and returned to the application tube 5 in the circuit via the liquid tank 15 by means of a pump 16.

Durch das Führen des Kopiermaterials 3 in einer Ebene, zum Beispiel wie gezeigt in der Waagrechten, wird eine hohe Durchlaufgeschwindigkeit von 10-25 m/min, die fallweise auch noch überschritten werden kann, ermöglicht. Vorzugsweise wird bei Durchlaufgeschwindigkeiten im Bereich von 12-15 m/min gearbeitet.By guiding the copying material 3 in one plane, for example horizontally as shown, a high throughput speed of 10-25 m / min, which can also be exceeded in some cases, is made possible. Work is preferably carried out at throughput speeds in the range of 12-15 m / min.

Claims (7)

1. A device for the prewetting of an electrophotographic copying material carrying a latent image to be subsequently developed, by passing the material through a system provided with a pair of feeding rollers and a pair of output rollers, characterized in that it comprises, in the area of the lower rollers (2, 11 ), a synthetic fabric representing a guide element (6), which can be adjusted in respect of the line (L) defined by ghe vertices of the pairs of rollers and above which there is an application tube (5) which is equipped with apertures (4), fed with pure developer liquid (12) through its front sides and adjustable in respect of the line (L) while, below the level of said element (6), there is a retaining element (8) provided in the area of application, and in that it comprises means for returning the pure developer liquid to the application tube (5), via a collector through (14) and a liquid tank (15).
2. Device as claimed in claim 1, characterized in that a synthetic fabric of the type employed for screen printing is used.
3. Device as claimed in claims 1 and 2, characterized in that the application tube (5) is a plastic tube provided with a slit.
4. Device as claimed in claims 1 to 3, characterized in that the distance between the apertures (4) of the application tube (5) and the surface of the copying material is between 0.5 and 2.5 mm.
5. Device as claimed in claims 1 to 4, characterized in that the gap between the pair of output rollers (10, 11 ) can be adjusted within a range of from 0.2 to 1 mm.
6. Device as claimed in claims 1 to 5, characterized in that transport speed of the copying material (3) is about 10 to 25 m/min.
7. Device for developing the latent image, characterized in that it is constructed in the same way as the prewetting device claimed in claims 1 to 3.
EP80101538A 1979-03-30 1980-03-24 Device for wetting electrophotographic material Expired EP0018494B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE7909182 1979-03-30
DE7909182U 1979-03-30

Publications (2)

Publication Number Publication Date
EP0018494A1 EP0018494A1 (en) 1980-11-12
EP0018494B1 true EP0018494B1 (en) 1983-04-27

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EP80101538A Expired EP0018494B1 (en) 1979-03-30 1980-03-24 Device for wetting electrophotographic material

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DE (1) DE3062862D1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2404138A (en) * 1941-10-06 1946-07-16 Alvin L Mayer Apparatus for developing exposed photographic prints
GB1267404A (en) * 1968-05-21 1972-03-22 Ricoh Kk Improvements in and relating to electro-photographic copying methods and arrangements
JPS4912429B1 (en) * 1969-09-19 1974-03-25
FR2198650A5 (en) * 1972-08-31 1974-03-29 Farnier Rene
US3871329A (en) * 1972-10-16 1975-03-18 Dennison Mfg Co Development electrode

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Publication number Publication date
EP0018494A1 (en) 1980-11-12
DE3062862D1 (en) 1983-06-01

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