EP0778129B1 - Machine d'impression digital et procédé pour son transport de feuilles - Google Patents

Machine d'impression digital et procédé pour son transport de feuilles Download PDF

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Publication number
EP0778129B1
EP0778129B1 EP96119438A EP96119438A EP0778129B1 EP 0778129 B1 EP0778129 B1 EP 0778129B1 EP 96119438 A EP96119438 A EP 96119438A EP 96119438 A EP96119438 A EP 96119438A EP 0778129 B1 EP0778129 B1 EP 0778129B1
Authority
EP
European Patent Office
Prior art keywords
conveyor belt
substrates
cylinder
printing machine
printing
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
EP96119438A
Other languages
German (de)
English (en)
Other versions
EP0778129A1 (fr
Inventor
Anton Rodi
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.)
RODI, ANTON
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0778129A1 publication Critical patent/EP0778129A1/fr
Application granted granted Critical
Publication of EP0778129B1 publication Critical patent/EP0778129B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/70—Forming the printing surface directly on the form cylinder

Definitions

  • the invention relates to a digital printing machine and a Process for sheet transport using an endless Conveyor belt on one or more digital printing units past.
  • a digital printing press contains one or more Printing units in which one by electrical signals controllable write head on a movable Intermediate carrier creates latent images that the electrical Signals.
  • the latent images Charge distributions of electrons or ions on the Be intermediate carrier.
  • the latent images are marked by a Inking unit developed by according to the charge distribution Printing ink is applied to the intermediate carrier. Then the ink is either immediately from the Intermediate carrier or one or more others Transfer intermediate carrier to substrates to be printed, for example Sheets of paper.
  • Rotating cylinders or around are used as intermediate carriers rotating cylinder revolving belts.
  • the ones to be printed Sheets are made on the intermediate beam or on the last one a series of intermediate carriers connected in series transported past, the color z. B. by more or less strong pressure is transferred to the arches.
  • the required transfer pressure can e.g. B. by Impression cylinders are applied on the side of the Conveyor belt are arranged opposite the sheets so that the conveyor belt and thus the sheets against the Intermediate carrier of the printing unit can be pressed.
  • a conveyor belt can be used for this purpose use an insulating material that is electrically charged will to the arches by electrostatic attraction to be held on the conveyor belt.
  • relatively strong holding forces are required to To prevent sheet detachment with certainty. So strong Generating holding forces is not only complex, but also also complicates the separation of the sheets from the conveyor belt for delivery to a boom stack after the Printing units have passed.
  • the invention has for its object the arches with only low holding forces reliably on the conveyor belt hold when they pass an intermediate carrier, of which the Ink is transferred to the sheets.
  • the arches are not whole Leading edge at once in the pressure gap between one Cylinder and the conveyor belt run in, as with Printing presses is common, but in one Tilt to the cylinder. This is located along only a small section of the arc width The leading edge of the sheet in a critical area in which the There is a risk of detachment. Therefore, it may be sufficient the inherent rigidity of the arches in connection with their interface liability on the conveyor belt so they the pressure gap reliably without detaching from the conveyor belt leave.
  • Supplementary can be on the conveyor belt acting holding forces are used with the type of sheet inlet according to the invention in the printing nip cooperate advantageously.
  • the critical one mentioned Area adjacent areas on the arch face a total a much larger area than that in the printing nip area. This makes the areas stand out are currently not in the print nip, even with relative weak holding forces able to narrow the section to restrain the leading edge of the sheet on the conveyor belt, which is currently in the pressure nip.
  • the invention is particularly suitable in connection with electrostatic holding forces that are very simple Generate the way, but proportional to the distance of the Sheet from the conveyor belt. While in this Case with a conventional type of sheet inlet itself a slight sheet detachment is no longer repairable and leads to a malfunction of the printing operation, can with the Partial inlet type according to the invention occurring sheet detachments through the neighboring areas undone.
  • the invention is also in connection with supportive holding forces on the conveyor belt useful, generated in any way other than electrostatic be, e.g. B. by slight negative pressure.
  • the invention has the additional advantage that shocks when the sheets enter or leave the Pressure gap can be avoided.
  • This shock absorption is special effective if the sheets follow each other closely, so that a new sheet is already in the printing nip on one side runs in if the previous sheet still has the printing nip has not left.
  • the invention can be implemented in two alternative ways become. Either the sheets are made in the conventional way an investor on the conveyor belt, namely with their leading edges at right angles to the direction of transport, and the cylinders on which the transfer of the ink are slanted. Or the cylinders in a conventional way perpendicular to the direction of transport ordered, and the investor is set up to Bends in a desired inclination on the Put on the conveyor belt.
  • the printing machine shown in section in FIG. 1 contains a Conveyor belt 1, the one lying on it in a row Bends 2 in the direction of an arrow P from a stack of feeders transported to a boom stack, neither of which are drawn.
  • the sheets 2 can be sheets of paper or any other substrates to be printed, e.g. B. Plastic films.
  • a transfer cylinder 3 is rotatable above the Conveyor belt 1 or the sheets 2 rotatable about an axis 4 stored.
  • An impression cylinder 5 is rotatable below the Conveyor belt 1 stored.
  • the transfer cylinder 3 and the impression cylinder 5 extend in their Axial direction across the printing width of the sheets 2.
  • the conveyor belt 1 has an insulating surface on by a facility not shown is electrically charged so that the sheets 2 during the Adhere to the transport electrostatically. Alternatively or in addition, the arches 2 can be suitably electrically charged become.
  • the latent images are through a schematically drawn inking unit 7 according to the Charge distribution developed by selectively printing on ink the transfer cylinder 3 is applied, and the developed images are then more or less strong pressure on the sheets 2 transferred and by not shown means fixed on it.
  • Angle ⁇ is essential that a Sheet 2 always only a small part of the sheet leading edge 8 in the pressure gap between the transfer cylinder 3 and the Impression cylinder 5 is located.
  • a width of Pressure gap of z. B. 0.5 to 1 mm can be given in a Machine configuration an angle ⁇ of 1 ° or less are enough to achieve this.
  • the write head 6, the z. B. is an elongated array, that extends across the printable sheet width, can parallel to the axis 4 of the transfer cylinder 3rd be arranged.
  • the print head 6 supplied image data according to the inclination of the Transfer cylinder 3 can be changed or influenced.
  • a write head 6 which is a series of at a pixel pitch contains imaging elements arranged side by side, can e.g. B. the data related to imaging elements belong along the circumference of the transfer cylinder 3rd closer to the bow 2, accordingly delayed to the Print head 6 are given.
  • transfer cylinder 3 can also additional transfer cylinders for additional colors at an angle be put.
  • the print heads can also be parallel to the leading edge 8 of the sheet be arranged as in Fig. 2 on another Transfer cylinder 9, for example, by a dashed line shown write head 10 is shown.
  • the image data can the print head 10 without Change can be fed line by line so that the Information in exactly the same way as with one straight lying transfer cylinders are processed.
  • the angle ⁇ is small and the write head 10 of is of a type in which there is no precisely defined distance from the Transfer cylinder 9 must be adhered to Print head 10 not specifically for this arrangement be set up. Otherwise, too Print head constructions conceivable, so to speak "nestle" the transfer cylinder 9.
  • the inking unit 7 can be set to one be arranged in the usual way, d. H. parallel to the axis of the Transfer cylinder 3 or 9.
  • printing units with only one Transfer cylinder 3 or 9 can also print units with several in a row switched transmission cylinders are used for example a cylinder, on the circumference of which Print head and the inking unit are arranged, and one rolling further cylinder on it, which in turn on the Rolls sheets or the conveyor belt.

Landscapes

  • Ink Jet (AREA)
  • Handling Of Sheets (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Handling Of Cut Paper (AREA)

Claims (11)

  1. Presse numérique munie d'une bande transporteuse sans fin présentant une partie longitudinale sur laquelle des substrats à imprimer sont transportés l'un après l'autre dans un sens de transport à travers la presse, et d'un ou plusieurs groupes d'impression dont chacun présente un cylindre disposé en face de la partie longitudinale de la bande transporteuse ou bien en face des substrats qu'elle transporte et pouvant tourner en synchronisme avec le mouvement de la bande transporteuse, en vue d'assurer le transfert d'encre sur les substrats avec une distribution correspondant à une image d'impression désirée,
    caractérisée en ce
    que chacun des cylindres (3 ; 9) est disposé de manière telle que l'angle entre son axe (4) et le sens de transport (P) soit inégal à 90°.
  2. Presse numérique suivant la revendication 1,
    caractérisée en ce
    que l'encre à transférer se trouve sur une surface du cylindre (3 ; 4) ou d'une bande circulant autour du cylindre.
  3. Presse numérique suivant la revendication 2,
    caractérisée en ce
    que chacun des groupes d'impression présente un dispositif d'écriture longitudinal (6 ; 10) pouvant être piloté par signaux électriques, disposé transversalement par rapport au sens de transport (P) le long de la surface du cylindre (3 ; 9) ou de la bande circulant autour du cylindre et générant sur la surface des images latentes correspondant aux signaux électriques, ainsi qu'un dispositif d'encrage (7) développant les images latentes avec de l'encre.
  4. Presse numérique suivant la revendication 3,
    caractérisée en ce
    que le dispositif d'écriture (10) est disposé dans un angle de 90° par rapport au sens de transport (P).
  5. Presse numérique suivant la revendication 3,
    caractérisée en ce
    que le dispositif d'écriture (6) est disposé parallèlement à l'axe du cylindre (3).
  6. Presse numérique suivant l'une quelconque des revendications précédentes,
    caractérisée en ce
    qu'elle présente un dispositif générateur de forces d'attraction entre la bande transporteuse (1) et les substrats (2) qu'elle transporte.
  7. Presse numérique suivant la revendication 6,
    caractérisée en ce
    que les forces d'attraction sont des forces électrostatiques.
  8. Procédé de transport de substrats à imprimer dans une presse au moyen d'une bande transporteuse sans fin, en passant par un ou plusieurs groupes d'impression numériques,
    caractérisé en ce
    que les substrats (2) sont placés sur la bande transporteuse (1) selon une orientation telle que l'angle entre le bord avant (8) des substrats et le sens de transport (P) de la bande transporteuse soit inégal à 90°.
  9. Procédé suivant la revendication 8,
    caractérisé en ce
    que, sur les groupes d'impression numériques, de l'encre est générée avec une distribution correspondant aux images d'impression désirées, et transférée aux substrats (2), et en ce que les images d'impression sont générées selon une orientation correspondant à la position transversale des substrats.
  10. Procédé suivant la revendication 8 ou 9,
    caractérisé en ce
    que des forces d'attraction sont générées entre la bande transporteuse (1) et les substrats (2) qu'elle transporte.
  11. Procédé suivant la revendication 10,
    caractérisé en ce
    que les forces d'attraction sont générées de manière électrostatique.
EP96119438A 1995-12-04 1996-12-04 Machine d'impression digital et procédé pour son transport de feuilles Expired - Lifetime EP0778129B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19545113 1995-12-04
DE19545113A DE19545113A1 (de) 1995-12-04 1995-12-04 Digitale Druckmaschine und Verfahren zum Bogentransport dafür

Publications (2)

Publication Number Publication Date
EP0778129A1 EP0778129A1 (fr) 1997-06-11
EP0778129B1 true EP0778129B1 (fr) 2000-06-07

Family

ID=7779100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96119438A Expired - Lifetime EP0778129B1 (fr) 1995-12-04 1996-12-04 Machine d'impression digital et procédé pour son transport de feuilles

Country Status (5)

Country Link
US (1) US5819667A (fr)
EP (1) EP0778129B1 (fr)
JP (1) JPH09179412A (fr)
KR (1) KR100227099B1 (fr)
DE (2) DE19545113A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19720741C2 (de) * 1997-05-17 2001-01-04 Koenig & Bauer Ag Druckmaschine
DE10321365A1 (de) * 2003-05-13 2004-12-16 X-Film Selbstkebefolien Gmbh Mit Digitaldrucktechnik bedruckbare Kunststoff-Folie und Herstellung einer bedruckten Kunststoff-Folie
JP5013707B2 (ja) * 2005-12-06 2012-08-29 キヤノン株式会社 画像形成装置
CN104309328A (zh) * 2014-10-23 2015-01-28 合肥东彩印刷科技有限公司 一种纸板进料装置
EP3419832B1 (fr) 2016-02-26 2021-10-06 Amcor Flexibles Sélestat SAS Substrats d'emballage souple comprenant des impressions thermiquement stables
CN108779355A (zh) 2016-03-18 2018-11-09 安姆科软包装赛利斯特股份公司 用于印刷蒸煮包装的柔性层压件

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE465246C (de) * 1928-09-12 Albert Schnellpressen Verfahren zum Erzielen eines guten Registers bei Druckmaschinen mit mehreren Druckwerken
DE283450C (fr) *
DE475563C (de) * 1927-04-17 1929-04-27 Rotaprint Gmbh Bogenleitvorrichtung fuer Rotationsgummidrucker
US2172113A (en) * 1937-12-15 1939-09-05 Standard Mailing Machines Comp Sheet end deflecting device for duplicators
US3366047A (en) * 1967-02-23 1968-01-30 Miehle Goss Dexter Inc Skewing arrangement for plate cylinder and form rollers in printing press
US3880076A (en) * 1972-10-11 1975-04-29 Said James A Black By Said Har Web registration with web pull-back and skewing means
JPS5632108B2 (fr) * 1973-08-10 1981-07-25
US4297022A (en) * 1979-12-03 1981-10-27 Static Systems Corporation Light pipe valve liquid crystal transmissive display for direct imaging on photosensitive materials
NZ198031A (en) * 1980-08-21 1988-11-29 Dennison Mfg Co Electrostatic printer: charged particles extracted from glow discharge
US4729310A (en) * 1982-08-09 1988-03-08 Milliken Research Corporation Printing method
US4511242A (en) * 1982-12-22 1985-04-16 International Business Machines Corporation Electronic alignment for a paper processing machine
DE3344424A1 (de) * 1983-12-08 1985-06-27 Fa. J.G. Mailänder, 7120 Bietigheim-Bissingen Verfahren und vorrichtung zur fuehrung von blechdruckmaschinen oder blechlackiermaschinen durchlaufenden blechtafeln od. dergleichen
NL8402940A (nl) * 1984-09-27 1986-04-16 Oce Nederland Bv Transportsysteem.
JPS61149972A (ja) * 1984-12-25 1986-07-08 Ricoh Co Ltd カラ−複写方法
JPS61221026A (ja) * 1985-03-26 1986-10-01 Canon Inc 画像形成装置
DE3534801A1 (de) * 1985-09-30 1987-04-02 Stiebel Eltron Gmbh & Co Kg Steckeinrichtung an einem heizflansch
EP0264507A1 (fr) * 1986-10-24 1988-04-27 Sarma Limited Procédé pour réaliser des livres à rouleaux
US4962707A (en) * 1986-12-05 1990-10-16 Claussen Gary J Apparatus for printing uniformly, with total die contact utilizing a pivoting drum and two air cylinders
US4941004A (en) * 1987-04-01 1990-07-10 Eastman Kodak Company Printer apparatus
JPH01274164A (ja) * 1988-04-27 1989-11-01 Ricoh Co Ltd カラー画像形成装置
DE4013003C3 (de) * 1990-04-24 2001-10-11 Roland Man Druckmasch Korrektur schrägliegender Druckbilder in einer Mehrfarbenbogendruckmaschine
US5233396A (en) * 1991-12-09 1993-08-03 Xerox Corporation Intermediate transfer member having a low surface energy compliant structure and method of using same
US5428429A (en) * 1991-12-23 1995-06-27 Xerox Corporation Resistive intermediate transfer member
DE4219116C2 (de) * 1992-06-12 1995-09-28 Roland Man Druckmasch Bogenrotationsdruckmaschine für Mehrfarbendruck

Also Published As

Publication number Publication date
DE19545113A1 (de) 1997-06-05
DE59605394D1 (de) 2000-07-13
JPH09179412A (ja) 1997-07-11
KR970033849A (ko) 1997-07-22
KR100227099B1 (ko) 1999-10-15
US5819667A (en) 1998-10-13
EP0778129A1 (fr) 1997-06-11

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