EP0222224B1 - Indirekte zweiseitige elektrostatische Druckmaschine - Google Patents

Indirekte zweiseitige elektrostatische Druckmaschine Download PDF

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Publication number
EP0222224B1
EP0222224B1 EP86114693A EP86114693A EP0222224B1 EP 0222224 B1 EP0222224 B1 EP 0222224B1 EP 86114693 A EP86114693 A EP 86114693A EP 86114693 A EP86114693 A EP 86114693A EP 0222224 B1 EP0222224 B1 EP 0222224B1
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EP
European Patent Office
Prior art keywords
film
electrostatic
recording medium
rolls
dielectric film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86114693A
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English (en)
French (fr)
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EP0222224A1 (de
Inventor
Patrice Playe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALCATEL BUSINESS SYSTEMS
Original Assignee
Alcatel Business Systemes SA
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Filing date
Publication date
Application filed by Alcatel Business Systemes SA filed Critical Alcatel Business Systemes SA
Publication of EP0222224A1 publication Critical patent/EP0222224A1/de
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Publication of EP0222224B1 publication Critical patent/EP0222224B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G03G15/232—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member

Definitions

  • the present invention relates to indirect electrostatic printers in which an intermediate recording medium film intended to receive an electrostatic image of what is to be printed is used and a final recording medium intended to receive the revealed latent image by inking and fixed on it by pressure.
  • Such a printer is known from document EP-A-0 091 074. It relates more particularly to printers making it possible to print the front and back of the same final support in a single operation, using a film intermediate recording medium.
  • Document GB-A-1590872 discloses an indirect electrostatic printer making it possible to simultaneously print the two faces of a final recording medium using two press rolls on which latent images are electrostatically formed and which are then inked before being transferred to the recording medium by the cylinders pressed against each other through this medium.
  • These films which are flexible consist of a thin dielectric strip, for example of polyester, which is stored in the form of rolls in the printers.
  • a latent electrostatic image is composed of ions deposited on one face of the intermediate support film by selective electrical discharge, at a zone of this film between printing, miniature, multiple electrodes and neighboring counter-electrodes.
  • the electrodes are usually distributed over one or more parallel rows and the counter-electrodes are usually arranged either opposite the electrodes and on the other side of the intermediate support film, or even along the electrodes and on the same side as with respect to said electrode. intermediate support film, in the area where electric shocks occur.
  • the inking which reveals the latent image is carried out using particles of liquid or powder ink electrically attracted by the electrostatic charges which the opposite face of the intermediate support film conveys.
  • the face of the film carrying ink particles which is in motion, is locally pressed against one of the faces of the final recording medium, in a transfer unit, so as to transmit the ink particles to it, the latter are then fixed to the final recording medium by mechanical pressure leading to close contact between the supports.
  • the final recording medium is preferably a standard quality medium, inexpensive, for example a conventional uncoated paper.
  • the image formation takes place with a very high speed typically of the order of ten micro-seconds per point or series of points simultaneously formed.
  • printers are designed to be able to be installed in very diverse and generally unskilled premises, for example on a desk or on a table, it becomes preponderant to obtain compact, silent, quick and easy to operate embodiments. by very diverse and possibly clumsy users.
  • the present invention therefore provides an electrostatic printer in which a single dielectric film is used, an intermediate recording medium, intended to receive through the intermediary of at least one writing head consisting of a set of electrodes of printing aligned and counter-electrodes, an electrostatic image of what one wishes to print and a recording medium, such as a sheet of paper, intended to receive the image after it has been revealed thanks to at least one ink device, said ink image being fixed on the recording medium by pressure, the two recording media being pressed against each other in a transfer unit with pressure rollers between which the two media pass simultaneously recording after inking the intermediate recording medium film.
  • the final recording medium is pressed, between two portions of the dielectric film which is applied successively to each of the two pressure rollers of the transfer unit by a different face, so as to allow on the one hand the electrostatic charge and the inking of two distinct areas of dielectric film, on the other hand the simultaneous transfer of inked images on the front and back of the same portion of final recording medium, from two zones of the same dielectric film which are located at a distance from each other on this film and each on a different face, each of these two film portions being able to be electrostatically charged by a writing head which is assigned to it and inked by an ink device assigned to it, each of the two ink devices being associated with a different pressure roller.
  • Figure 1 shows the structure of a known double-sided indirect electrostatic printer.
  • FIG. 2 shows the structure of a two-sided indirect electrostatic printer, according to the invention.
  • the indirect electrostatic printer presented in FIG. 1 comprises a chassis not shown here which carries the constituent members shown here, as well as a bodywork not shown which makes it possible to hide the members while allowing the introduction and the exit of the final recording medium 1 on which the printing takes place.
  • the final recording medium 1 is a paper possibly in a roll, but preferably in sheets of commercial format, because of the conveniences offered by this type of medium.
  • the printer here comprises at least one feeder 2 for sheets of blank paper and a tray 3 for collecting the sheets which have been printed.
  • the feeder 2 is for example a conventional removable feeder capable of receiving a stack of sheets which a push plate 4 with spring 5 presses against a destacker roller 6, which is secured to the chassis near and above an opening of the bodywork through which comes the unstacking end of the charger 2.
  • This feeder 2 is mechanically jammed in the printer by its unstacking end so that the stack of sheets it contains comes to bear by one of its ends and by its upper sheet against the periphery of the unstacking roller 6.
  • the latter is controlled in rotation by known means, when an impression is requested.
  • the top sheet of the stack is then driven by the unstacking roller 6 out of the feeder 2, through the open unstacking end of this feeder and towards the printing arrangement proper towards which it is driven by a short guide path 7, consisting of at least one wall of the chassis or the bodywork.
  • the printing arrangement essentially comprises two electrostatic writing heads 8, two ink devices 9 and a transfer unit 11 to which are added auxiliary arrangements for the dielectric film 10 serving as an intermediate recording medium.
  • Each writing head 8 is intended to gradually create, on a film 10, a latent electrostatic image by discharge between the printing electrodes of this head and the counter-electrodes associated therewith.
  • the printing electrodes and possibly the counter electrodes of a head are fixed and housed in a block of insulating material 111 in which they are aligned so as to each flush with one end flush with the surface of one of the faces 10A film 10 which touches the block 111 at this level during its movement, during the operation of the printer.
  • a cylinder 12 preferably rotatable about its axis and perpendicular to the direction of movement of the film 10 in front of the block 111 concerned, presses this film against this block at the desired level.
  • the dielectric film 10 must be arranged so as to move against the block 111 in a movement perpendicular to the alignment of the electrodes, for this purpose this film is conventionally wound on the one hand by one end around a transmitting shaft 13 where it is stored before use on the other hand by another end around a receiving shaft 14 where it is stored after use.
  • an individual dielectric film 10 is associated with each writing head and therefore has its own shafts 13, 14 with parallel axes for its storage.
  • Each dielectric head is of course placed between the shafts 13 and 14 storing the dielectric film which passes through it, it is optionally preceded by an electrostatic charge eraser 15, downstream of the emitter shaft 13 on the path of the film 10 which serves it .
  • Each eraser 15 comprises at least one erasing unit responsible for eliminating the electrostatic charges carried by one of the two faces of a film 10, or preferably an erasing unit for each face of the film 10.
  • each of the two erasing units of an eraser 15 comprises two conductive rollers 17, 18 parallel and almost tangent, which are arranged transversely to the film 10 at the output of the reel wound around a transmitting shaft 13, so as to apply over the entire width of the film each on one side of this film.
  • the two rollers 17, 18 of an erasing unit are subjected to a difference in high voltage alternating potential, for example of the order of 1500 volts and from 1 to 150 KHz.
  • One of the two rollers of an erasing unit is made of hard metallic material and good conductor, while the other is preferably made of flexible material of the elastomer or silicone type charged with conductive particles.
  • rollers 17 and 18 of the same eraser which are parallel to each other are preferably arranged so as to force the film 10 which passes through them to oblique twice by pressing on a hard metal roller over a relatively large area of which this film then carries.
  • An inking device 9 is placed nearby of each writing head 8, downstream of the latter on the path of a film 10 relative to the emitting shaft 13-of this film.
  • Each inking device 9 comprises, for example, a magnetic brush 19, which constitutes a multipolar magnet intended to entrain in its field lines crests of a magnetic powder contained in a bin filled with a removable cartridge 21, coming to be placed above him.
  • a magnetic brush 19 which constitutes a multipolar magnet intended to entrain in its field lines crests of a magnetic powder contained in a bin filled with a removable cartridge 21, coming to be placed above him.
  • Each magnetic brush 19 is rotatable about an axis 22 disposed transversely to the film 10 at the outlet of a writing head, the film being pressed there over its entire width against a roller 11A or 11 B of the transfer 11.
  • the two rollers 11A and 11B are made of a conductive, non-magnetic, hard material, they are moreover rotated and electrically connected to the mass of the printer.
  • Each magnetic brush 19 is capable of being rotated by conventional motor means, not shown, so as to come and graze a face of film 10, without touching it, in the area where this film is pressed against a roll of the unit. transfer 11, on the other side of this roller relative to the film, the transfer roller 11A or 11 B associated with a magnetic brush 19 being on the same side of the film 10 as the cylinder 12 of the writing head 8 placed in front of this transfer roller and this magnetic brush on the path of the film in question.
  • the powder of the magnetic egrets driven in rotation by a magnetic brush 19, is selectively attracted by the electrostatically charged zones of the face of the film 11 which it brushes against and it therefore comes to be deposited at these zones when the Coulomb force d attraction becomes greater than the magnetic force of the magnet.
  • the two rollers 11A and 11B which are parallel and pushed towards each other by the pressure arrangement mentioned above, see two portions of films inserted between them 10 different which come to run in parallel and in the same direction between the rollers 11A and 11B.
  • an electronic control unit that is not shown synchronizes the electrostatic writings of the two heads so that the inked images carried respectively by the inking face 10A of each of the two films 10 concerned, apply suitably at the corresponding height on a final support sheet 1, which is inserted between the faces 10A of the two films under the action of driving the transfer rollers 11A, 11B possibly assisted by rollers or auxiliary rollers, such as the destacking roller 6.
  • the ink carried by the faces 10A of the films becomes encrusted under the pressure of the rollers 11A, 11B on the front and back of the final recording medium 1 which is ejected by an output guide 23 towards the collection bin 3, located for example on the outside and on the top of the printer.
  • a drive roller 24 helps to extract the final recording medium 1 from the rollers and to send it to the collecting tank 3.
  • an auxiliary heater can be associated with the transfer unit to complete the fixing of the ink, if this remains necessary.
  • the portions of the two films 10, one face of which has been inked, are conventionally sent to their respective storage reels on the two shafts 14, via at least one orientation roller 25, conventionally rotary and movable, in order to ensure suitable winding. of used film regardless of the size of the reel being wound.
  • the printer comprises at least one feeder 2, preferably removable, for the sheets of final recording medium before printing, as well as a collection tray 3 for the printed sheets, it being understood that it is possible to replace these elements and in particular the charger by a coil system on carrier shaft, or an accordion leaf charger.
  • the printer also has two writing heads 8, two ink devices 9 and a transfer unit 11 identical or similar to those described above.
  • the single dielectric film 10 is carried by two parallel shafts 13 and 14 arranged here on the same side of the transfer unit 11 that constitute the rollers 11A and 11B.
  • the movie 10 is then partially wound on the transfer roller 11 B on which it is supported by its face 10A opposite the face 10B where the first writing head has formed an electrostatic image.
  • the latter is inked by a first inking device 19 placed on the other side of the film 10 relative to the transfer roller 10B and flush with this film.
  • the movement of the film 10 with the transfer roller 11 B brings the inked image to the level of the second transfer 11A so that the region of the face 10B of the film which carries this image comes to press against a corresponding portion of sheet of the support. final recording 1, between the transfer rollers.
  • the pressure applied by these transfer rollers to the film and the sheet causes the inked image to be transferred to one of the two faces of the sheet concerned, for example to the front.
  • the film 10 comes to join in a loop the second transfer roller 11A by a path, via orientation rollers 26, a cleaning unit 27, a second electrostatic charge eraser 15 and a second writing head 8.
  • the unit cleaning 27 is responsible for removing the ink remaining on the face 10B of the film which has been previously inked, it comprises for example one or more rubbing strips which scrape the face 10B then oriented towards the bottom of the printer so dropping in a container, not referenced, the particles still stuck to this face 10B.
  • the second writing head 8 After the electrostatic discharge of the film by the second charge eraser 15, the second writing head 8 then inscribes a second electrostatic image on the film 10, or more precisely on the face 10A of this film, which then comes partially wind on the roller 11A, taking support on this roller by its face 10B.
  • the second electrostatic image which has been formed on the face 10B of the film is then inked by the second inking device 9, placed on the other side of the film with respect to the roller 11A.
  • the movement of the film 10 with the roller 11A brings the second inked image at the level of the first roller 11B, so that the area of the face 10A of the film which carries this second image comes to press against a corresponding portion of sheet of the support 'final record 1, between the transfer rollers.
  • the printed sheet is ejected by the transfer rollers 11A, 11 B pressed against each other for printing and mechanically driven, it is guided towards the receiving tray 3 by a drive roller 24.
  • the film 10 which has successively come to wind around the transfer roller 11 B then around the transfer roller 11A and then collected by the receiving shaft 14 towards which it is guided by orientation rollers 25.
  • the receiving shaft 14 is positioned inside the loop formed by the film 10 around the transfer roller 11A passing through the orientation rollers 26, so as to allow the change of the bearing face of the film on the final recording medium.
  • the container is housed under the receiving shaft 14 and inside the loop, this container being here with lateral opening perpendicular to the plane of the figure.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electronic Switches (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Claims (4)

1. Elektrostatischer Drucker, in dem ein einziger dielektrischer Film als Zwischenträger (10) verwendet wird, der dazu bestimmt ist, über mindestens einen elektrostatischen Schreibkopf (8), bestehend aus einem Satz von fluchtenden Drukkelektroden und Gegenelektroden, ein elektrostatisches Bild dessen, was gedruckt werden soll, zu empfangen, und ein endgültiger Aufzeichnungsträger (1), z.B. Papier in Blattform, der dazu bestimmt ist, das Bild nach der Entwicklung in mindestens einer Tonervorrichtung (9) zu empfangen, wobei das mit Toner versehene Bild auf dem endgültigen Aufzeichnungsträger durch kräftigen Druck fixiert wird und die beiden Aufzeichnungsträger in einer Transfereinheit (11), die Druckrollen, Transferrollen genannt (11A, 11 B), aufweist, gegeneinander gepreßt werden, zwischen denen gleichzeitig beide Aufzeichnungsträger (1 und 10) nach dem Aufbringen des Toners auf den Zwischenträgerfilm (10) hindurchlaufen, dadurch gekennzeichnet, daß der endgültige Aufzeichnungsträger (1) zwischen zwei Bereichen des dielektrischen Films (10) unter Druck gesetzt wird, der nacheinander über die beiden Rollen (11A, 11B) der Transfereinheit (11) mit je einer anderen seiner Seiten verläuft, so daß gleichzeitig einerseits eine elektrostatische Aufladung und eine Tonerzugabe in zwei unterschiedlichen Zonen des dielektrischen Films erfolgt und andererseits gleichzeitig die Tonerbilder auf Vorder- und Rückseite eines gemeinsamen endgültigen Aufzeichnungsträgers (1) ausgehend von zwei Bereichen des dielektrischen Films übertragen werden, die voneinander auf dem Film einen Abstand besitzen und auf unterschiedlichen Seiten des Films liegen, wobei jeder dieser beiden Bereiche von einem ihm jeweils zugeordneten Schreibkopf (8) elektrostatisch geladen und von einer ihm zugeordneten Tonervorrichtung (9) mit Toner versehen werden kann und wobei jede der beiden Tonervorrichtungen (9) einer anderen Transferrolle (11A bzw. 11B) zugeordnet ist.
2. Elektrostatischer Drucker nach Anspruch 1, in dem der dielektrische Film auf zwei Tragespulen (13, 14) mit parallelen Achsen aufgerollt ist, dadurch gekennzeichnet, daß eine dieser Spulen sich in einer Schleife befindet, die durch den über die Rollen (11 B) der Transfereinheit (11) verlaufenden Film nach dessen Umlauf um die Rollen (11A, 11B) dieser Einheit gebildet wird.
3. Elektrostatischer Drucker nach Anspruch 2, dadurch gekennzeichnet, daß die beiden Spulen (13, 14) für den dielektrischen Film (10) auf einer gemeinsamen Seite bezüglich der Rollen (11A, 11 B) der Transfereinheit angeordnet sind.
4. Elektrostatischer Drucker nach Anspruch 1, dadurch gekennzeichnet, daß er je eine einer der beiden Rollen (11A, 11 B) der Transfereinheit (11) zugeordnete Tonervorrichtung (9) aufweist, wobei vor jeder Tonervorrichtung im Verlauf des dielektrischen Films (10) von der Rolle (13) für den unverbrauchten dielektrischen Film bis zur Rolle (14) für den verbrauchten Film eine elektrostatische Löschvorrichtung (15) zum Löschen elektrostatischer Ladungen vor der betrachteten Transferrolle (11A oder 11 B) liegt, auf die der elektrostatische Schreibkopf (8) folgt.
EP86114693A 1985-10-28 1986-10-23 Indirekte zweiseitige elektrostatische Druckmaschine Expired - Lifetime EP0222224B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8515977 1985-10-28
FR8515977A FR2589104A1 (fr) 1985-10-28 1985-10-28 Imprimante electrostatique indirecte recto-verso

Publications (2)

Publication Number Publication Date
EP0222224A1 EP0222224A1 (de) 1987-05-20
EP0222224B1 true EP0222224B1 (de) 1990-09-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114693A Expired - Lifetime EP0222224B1 (de) 1985-10-28 1986-10-23 Indirekte zweiseitige elektrostatische Druckmaschine

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US (1) US4723137A (de)
EP (1) EP0222224B1 (de)
DE (1) DE3673952D1 (de)
FR (1) FR2589104A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4782352A (en) * 1986-09-30 1988-11-01 Seiko Instruments Inc. Capsule rupture printing system
US4811036A (en) * 1987-08-03 1989-03-07 Astro-Med Inc. Printing apparatus and print head mounting assembly therefor
NL8900921A (nl) * 1989-04-13 1990-11-01 Oce Nederland Bv Werkwijze en inrichting voor het overdragen van twee beelden op verschillende zijden van een ontvangstblad.
EP0478820B1 (de) * 1990-10-02 1996-01-03 Siemens Nixdorf Informationssysteme Aktiengesellschaft Druck- oder Kopiergerät für ein- oder mehrfarbigen Simplex- und Duplexdruck
DE4129277A1 (de) * 1991-09-03 1993-03-04 Siemens Nixdorf Inf Syst Elektrofotografisches simultan-doppeldrucksystem
DE19756796A1 (de) * 1997-12-19 1999-07-22 Koenig & Bauer Ag Verfahren zum Bedrucken von Bogen im Schön- und Widerdruck sowie Schöndruck

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3775102A (en) * 1971-09-03 1973-11-27 Xerox Corp Method of electrostatically copying information on both sides of an original onto both sides of a support material
GB1413190A (en) * 1973-06-25 1975-11-12 Xerox Corp Electrostatographic methods and apparatus
US3983815A (en) * 1975-01-29 1976-10-05 Honeywell Information Systems, Inc. Apparatus and method for printing on plain paper
GB1590872A (en) * 1978-05-31 1981-06-10 Xerox Corp Electrostatographic apparatus
US4427285A (en) * 1981-02-27 1984-01-24 Xerox Corporation Direct duplex printing on pre-cut copy sheets
FR2524390B1 (fr) * 1982-04-02 1986-10-17 Cit Alcatel Imprimante electrostatique indirecte

Also Published As

Publication number Publication date
DE3673952D1 (de) 1990-10-11
US4723137A (en) 1988-02-02
FR2589104A1 (fr) 1987-04-30
EP0222224A1 (de) 1987-05-20

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