EP0091074B1 - Imprimante électrostatique indirecte - Google Patents

Imprimante électrostatique indirecte Download PDF

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Publication number
EP0091074B1
EP0091074B1 EP83103118A EP83103118A EP0091074B1 EP 0091074 B1 EP0091074 B1 EP 0091074B1 EP 83103118 A EP83103118 A EP 83103118A EP 83103118 A EP83103118 A EP 83103118A EP 0091074 B1 EP0091074 B1 EP 0091074B1
Authority
EP
European Patent Office
Prior art keywords
image
tape
station
roller
support
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
EP83103118A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0091074A1 (fr
Inventor
Michel Beduchaud
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 Lucent SAS
Original Assignee
Alcatel SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alcatel SA filed Critical Alcatel SA
Publication of EP0091074A1 publication Critical patent/EP0091074A1/fr
Application granted granted Critical
Publication of EP0091074B1 publication Critical patent/EP0091074B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • G03G15/32—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head
    • G03G15/321—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by charge transfer onto the recording material in accordance with the image
    • 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
    • G03G15/28—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning
    • G03G15/283—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning using a reusable recording medium in form of a band

Definitions

  • the present invention relates to electrostatic printers and more particularly to those using an intermediate support on which a latent electrostatic image is formed and a final support, advantageously made of plain paper, onto which is transferred, after development, the previous latent electrostatic image.
  • electrostatic printers also known as direct electrostatic printers
  • the image is printed directly on a special final support, composed of a conductive substrate on which a dielectric layer a few micrometers thick is deposited.
  • the image printing process is carried out in several successive operations carried out in separate stations assigned to these operations.
  • the latent electrostatic image generated on an intermediate support then developed is transferred to a final support, generally made of paper, on which it is then fixed.
  • the printing steps or operations in these indirect electrostatic printers are carried out by means similar to those used in the successive stations of direct electrostatic printers, that of ink transfer from the intermediate support to the final support being intercalated between image development and fixation.
  • This ink transfer can advantageously be obtained in an image transfer station, by bringing this final plain paper support into intimate contact with the inked latent image of the intermediate support, with, if necessary, application of a suitable voltage on a so-called transfer electrode disposed on the back of the final support, promoting this transfer.
  • the intermediate support may consist of a conductive substrate on which a thin dielectric layer is deposited, but may also alternatively consist of a simple film of dielectric material.
  • a pressure roller ensures the intimate contact of the final plain paper on the previously inked image, for the transfer of the ink particles on the paper to which they will be subsequently fixed by application. higher pressure forces than image transfer.
  • the dielectric strip is subjected to cleaning and to erasing of the electrostatic charges after this image transfer operation for a new printing at the level of the first roller mentioned.
  • Document GB-A-1 064 980 also describes a mode of indirect electrostatic printing in which a dielectric strip is used as an intermediate image support and strip paper as a final image support.
  • the dielectric strip is delivered from a supply roll, passes successively through a latent image printing station, an image development station then a transfer station on the paper and, after cleaning, is rewound on a take-up roll.
  • the dielectric strip is driven along a quasi-rectilinear path by a first roller, upstream of these stations, and by a second drive roller and a pressure counter-roller, downstream of these stations.
  • each latent image line is successively generated on the dielectric strip, as it advances, by a pair of electrodes, one rotating having on its periphery the different characters. possible to print and the other fixed, arranged on either side of the dielectric strip.
  • each of the latent image lines after development, is transferred to the strip paper, driven transversely to the dielectric strip, by two transfer electrodes of length at least equal to that of an image line, between which the dielectric and paper strips pass in contact and perpendicular to each other.
  • the object of the present invention is to define a specific organization of the various means used in an indirect electrostatic printer with flexible intermediate support, such as a strip of dielectric material, allowing the reproduction of images printed on a final support, such as plain paper in sheets, and having a simple and compact structure.
  • an indirect electrostatic printer with intermediate image support in the form of a flexible strip of dielectric material and with final image support in paper comprising a latent image printing station an image development station and an image transfer station on a final support through which said strip is successively driven along its path between a supply roller and a take-up roller and comprising, in addition to said image transfer station, a fixing station for image through which said final support is driven, characterized in that said image transfer station and said image fixing station are constituted simultaneously by an auxiliary roller for folding the trajectory of said strip and an associated pressure roller receiving between them said strip and said final support and in that said auxiliary roller and said associated pressure roller constitute, in addition with said strip, the means for dragging to a station for returning copies of said final support in the direction of movement of said strip, said final support being capable of being in the form of individual sheets.
  • This indirect electrostatic printing printer comprises an intermediate image support 1, formed of a flexible strip of dielectric material, of great length, coming from a supply roller 2 and received by a take-up roller 3. Between these two rollers 2 and 3, the strip 1 is mounted in an open loop by means of an auxiliary roller 4 ensuring a folding of its trajectory along which it is driven from the supplying roller to the receiving roller.
  • This flexible strip 1 is constituted by a dielectric film of small thickness and width at least equal to that of the image to be printed and to be restored.
  • the strip 1 passes successively through an electrostatic printing station 5, arranged between the supply roll and the auxiliary roll, in a development station for image 6 arranged in the immediate vicinity of the auxiliary roller and in a common transfer and fixing station 7 supplied with individual sheets of plain paper 8 from an adjacent dispenser 9.
  • the printing station 5 is as such of conventional type and comprises a printing head 10 composed of a plurality of individual electrodes arranged in one or more lines or in matrix form facing the outside surface of the strip 1 in open loop, and an associated counter-electrode constituted by a conductive roller 11 in contact with the internal surface of the strip 1.
  • the latent electrostatic image is therefore printed on the external surface of the strip, as a function of control signals successively applied to the individual electrodes of the head by a suitable control circuit not shown.
  • the print head 10 further comprises spacing means between the electrodes and the external surface of the strip, in order to provide the necessary air film ion discharge performed for printing the latent image.
  • the development station 6 is as such known. It is here constituted by a magnetic brush 12 using a single-component or two-component powder taken from a reservoir 13, for inking the latent image previously generated. For reasons of compactness, this station is advantageously disposed in the immediate vicinity of the auxiliary roller 4 and is disposed substantially in the extension of the open loop of the strip 1.
  • the station for fixing and transferring the image of the strip 1 to the final plain paper support is constituted by the auxiliary roller 4 and a pressure roller 14 receiving an external pressure P coming to apply it against the strip 1 still supported by the roller 4.
  • the distributor 9 of individual sheets of paper with a guide outlet oriented tangentially to the rollers 4 and 14, feeds this image transfer and fixing station in synchronism with the generation of latent images in the printing station 5, as symbolized by the actuation control link C indicated between these two stations.
  • This dispenser q is also as such known and is therefore not described; only its connection C with the printing station, specific to this application, then makes it possible to suitably trigger the output of sheets 8, successively, which are directly snapped up between the rollers 4 and 14.
  • rollers 4 and 14 can be rollers kept cold metal between which are only strongly pressed the dielectric strip 1 and the sheet of paper 8.
  • the rollers 4 and 14 can be rollers kept cold metal between which are only strongly pressed the dielectric strip 1 and the sheet of paper 8.
  • the metal rollers 4 and 14 can be heated by means of lamps or filaments not shown. Under these conditions, the fixing of the image on the paper is improved and requires only a lower pressure. Simultaneously, the image transfer can also be improved by applying a potential difference between the rollers 14 and 4.
  • This restitution station 15 comprises a roll 16 for guiding the strip against which the internal face of the strip is applied, coming at least slightly to break 3a end of the trajectory in open loop of the strip 1, upstream of the receiving roller, and a separating member 17, mounted opposite the roller 16, at the end of the broken path, coming to receive the successive sheets of paper and guiding them to a return receptacle 18 where they are available.
  • the belt 1 is driven by the auxiliary roller 4 and the axis of the receiving roller 3, the supply roller 2 being mounted with slight friction on its axis so that the band 1 is properly tensioned when it passes through the station 5.
  • the auxiliary roller 4 and 3rd pressure roller 14 mounted free in rotation on its axis receiving the pressure P constitute a means of gripping the individual sheets 8 delivered by the distributor and, associated with the strip 1, their means of drive to receptacle 18.
  • the rollers 4 and 14 will each be covered with a material making it possible to adapt the coefficients of friction between the rollers, the paper and the dielectric strip and also to compensate for its flexibility roller machining faults.
  • the long dielectric strip in a roll running along an open loop path to a take-up roll, makes it possible to define a printer structure of great simplicity and great compactness due essentially to the fact of the use a common station for transferring and fixing a latent image on sheets of paper driven simultaneously with the strip, produced by the sole mounting of the pressure roller 14 associated with the auxiliary roller 4 for folding the trajectory of the strip.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Paper Feeding For Electrophotography (AREA)
EP83103118A 1982-04-02 1983-03-29 Imprimante électrostatique indirecte Expired EP0091074B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8205726 1982-04-02
FR8205726A FR2524390B1 (fr) 1982-04-02 1982-04-02 Imprimante electrostatique indirecte

Publications (2)

Publication Number Publication Date
EP0091074A1 EP0091074A1 (fr) 1983-10-12
EP0091074B1 true EP0091074B1 (fr) 1986-09-24

Family

ID=9272686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83103118A Expired EP0091074B1 (fr) 1982-04-02 1983-03-29 Imprimante électrostatique indirecte

Country Status (7)

Country Link
US (1) US4514078A (enrdf_load_stackoverflow)
EP (1) EP0091074B1 (enrdf_load_stackoverflow)
JP (1) JPS58187380A (enrdf_load_stackoverflow)
CA (1) CA1191188A (enrdf_load_stackoverflow)
DE (1) DE3366381D1 (enrdf_load_stackoverflow)
FR (1) FR2524390B1 (enrdf_load_stackoverflow)
IE (1) IE54161B1 (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4600296A (en) * 1985-06-17 1986-07-15 Eastman Kodak Company Compact electrographic reproduction apparatus
FR2584560B1 (fr) * 1985-07-03 1990-05-11 Telephonie Ind Commerciale Dispositif effaceur de charges electrostatiques
FR2589104A1 (fr) * 1985-10-28 1987-04-30 Telephonie Ind Commerciale Imprimante electrostatique indirecte recto-verso
DE3783795T2 (de) * 1986-04-03 1993-05-19 Fuji Photo Film Co Ltd Bildaufnahmegeraet.
US4684238A (en) * 1986-06-09 1987-08-04 Xerox Corporation Intermediate transfer apparatus
US4809032A (en) * 1986-12-10 1989-02-28 Kabushiki Kaisha Toshiba Printing apparatus
US4796048A (en) * 1987-11-23 1989-01-03 Xerox Corporation Resilient intermediate transfer member and apparatus for liquid ink development
US5194902A (en) * 1988-05-16 1993-03-16 Sharp Kabushiki Kaisha Transfer unit
US4954845A (en) * 1988-08-02 1990-09-04 Canon Kabushiki Kaisha Image fixing device and image forming apparatus with same
US4970551A (en) * 1988-09-16 1990-11-13 International Business Machines Corporation Cartridge containing a reciprocating photoconductor ribbon for serial electrophotographic printing
US5257046A (en) * 1992-08-31 1993-10-26 Xerox Corporation Direct electrostatic printing with latent image assist
AUPN846496A0 (en) * 1996-03-05 1996-03-28 Research Laboratories Of Australia Pty Ltd Electronic printing for display technology
CN102627043A (zh) * 2012-04-24 2012-08-08 陈成文 一种自动盖章机

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761416A (en) * 1953-01-02 1956-09-04 Battelle Development Corp Development mechanism for electrostatic images
DE1132861B (de) * 1959-09-29 1962-07-05 Sandt A G Maschinenfabrik J Ablegevorrichtung fuer Stanzgut
US3194674A (en) * 1961-05-24 1965-07-13 Burroughs Corp Apparatus and method for duplicating messages which are electrostatically charged, developed and fixed on a master dielectric medium onto copy media capable of retainingelectrostatic charges
US3198648A (en) * 1961-11-30 1965-08-03 Burroughs Corp Electrostatic recording method
GB1064980A (en) * 1963-12-28 1967-04-12 Hitachi Ltd Method of and apparatus for electro-static successive recording of letters and printing of lines
BE774506A (fr) * 1970-10-26 1972-02-14 Commw Of Australia Represente Tete de distribution a picots utilisee pour enregistrer des signaux ou a des fins analogues
JPS5312618A (en) * 1976-07-22 1978-02-04 Fujitsu Ltd Recording device
US4286032A (en) * 1978-04-27 1981-08-25 Canon Kabushiki Kaisha Electrophotographic process and apparatus therefor

Also Published As

Publication number Publication date
US4514078A (en) 1985-04-30
IE830741L (en) 1983-10-02
JPS58187380A (ja) 1983-11-01
FR2524390B1 (fr) 1986-10-17
CA1191188A (fr) 1985-07-30
JPH0257781B2 (enrdf_load_stackoverflow) 1990-12-05
DE3366381D1 (en) 1986-10-30
IE54161B1 (en) 1989-07-05
EP0091074A1 (fr) 1983-10-12
FR2524390A1 (fr) 1983-10-07

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