EP0778129A1 - 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
EP0778129A1
EP0778129A1 EP96119438A EP96119438A EP0778129A1 EP 0778129 A1 EP0778129 A1 EP 0778129A1 EP 96119438 A EP96119438 A EP 96119438A EP 96119438 A EP96119438 A EP 96119438A EP 0778129 A1 EP0778129 A1 EP 0778129A1
Authority
EP
European Patent Office
Prior art keywords
conveyor belt
substrates
cylinder
digital printing
sheets
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.)
Granted
Application number
EP96119438A
Other languages
German (de)
English (en)
Other versions
EP0778129B1 (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
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
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 press and a method for sheet transport by means of an endless conveyor belt past one or more digital printing units.
  • a digital printing press contains one or more printing units in which a write head which can be controlled by electrical signals generates latent images on a movable intermediate carrier which correspond to the electrical signals.
  • the latent images can be charge distributions of electrons or ions on the intermediate carrier, for example.
  • the latent images are developed by an inking unit by applying printing ink to the intermediate carrier in accordance with the charge distribution. The printing ink is then transferred either directly from the intermediate carrier or via one or more further intermediate carriers to substrates to be printed, such as paper sheets.
  • Rotating cylinders or belts rotating around rotating cylinders are used as intermediate carriers.
  • the sheets to be printed are transported past the intermediate support or the last one from a series of intermediate supports connected in series, the color e.g. B. is transmitted by more or less strong pressure on the sheets.
  • endless conveyor belts which have an elongated section on which the sheets of a feeder stack can be transported to a delivery stack.
  • the required transfer pressure can e.g. B. be applied by impression cylinders, which are arranged on the side of the conveyor belt opposite the sheets, so that the conveyor belt and thus the sheets are pressed against the intermediate carrier of the printing unit.
  • a conveyor belt made of an insulating material that is electrically charged in order to hold the sheets on the conveyor belt by electrostatic attractive forces.
  • relatively strong holding forces are required to reliably prevent sheet detachments. Generating such strong holding forces is not only complex, but also complicates the separation of the sheets from the conveyor belt for delivery to a delivery stack after they have passed the printing units.
  • the object of the invention is to reliably hold the sheets on the conveyor belt with only slight holding forces when they pass through an intermediate carrier from which the printing ink is transferred to the sheets.
  • the sheets are not run with their entire leading edge at once into the pressure gap between a cylinder and the conveyor belt, as in Printing press is common, but in an inclined position to the cylinder.
  • the inherent rigidity of the sheets in connection with their interface adhesion on the conveyor belt may be sufficient so that they leave the printing nip reliably without detaching from the conveyor belt.
  • Additional support forces acting on the conveyor belt can be used to support this, which advantageously cooperate with the type of sheet inlet into the printing nip according to the invention.
  • the areas on the sheet adjacent to the critical area mentioned have an overall much larger area than the area currently in the printing nip. As a result, the areas that are not currently in the printing nip, even with relatively weak holding forces, are able to hold back the narrow section of the leading edge of the sheet on the conveyor belt that is currently in the printing nip.
  • the invention is particularly suitable in connection with electrostatic holding forces which can be generated in a very simple manner, but which become smaller in proportion to the distance of the sheet from the conveyor belt. While in this case even a slight sheet detachment can no longer be repaired in a conventional type of sheet inlet and leads to a malfunction of the printing operation, any partial sheet detachments that occur in the inventive type of sheet inlet can be reversed by the adjacent areas.
  • the invention is also useful in connection with supporting holding forces on the conveyor belt, generated in any other way than electrostatic, e.g. B. by slight negative pressure.
  • the invention has the additional advantage that shocks are avoided when the sheets enter or exit the printing nip. This shock absorption is particularly effective when the sheets follow one another closely, so that a new sheet already enters the printing nip on one side if the previous sheet has not yet left the printing nip.
  • the invention can be implemented in two alternative ways. Either the sheets are conveyed onto the conveyor belt by a feeder in a conventional manner, namely with their leading edges exactly at right angles to the direction of transport, and the cylinders on which the ink is transferred are tilted. Or the cylinders are arranged in a conventional manner at right angles to the direction of transport, and the feeder is set up to place the sheets on the conveyor belt in a desired inclined position.
  • the printing machine shown in section in FIG. 1 contains a conveyor belt 1, which transports sheets 2 lying thereon one behind the other in the direction of an arrow P from a feeder stack to a delivery stack, both of which are not shown.
  • 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 rotatably supported above the conveyor belt 1 or the sheets 2 about an axis 4.
  • An impression cylinder 5 is rotatably mounted below the conveyor belt 1.
  • the transfer cylinder 3 and the impression cylinder 5 extend in their axial direction across the printing width of the sheets 2.
  • the transfer cylinder 3 and the impression cylinder 5 press against each other, so that the sheets 2 are pressed against the impression cylinder 3 when they are removed from the conveyor belt 1 by the Printing gap between the transfer cylinder 3 and the impression cylinder 5 are transported.
  • the conveyor belt 1 has an insulating surface which is electrically charged by a device not shown, so that the sheets 2 adhere to it electrostatically during transport. Alternatively or additionally, the arches 2 can be suitably electrically charged.
  • Image data is supplied to a write head 6 arranged and schematically drawn in at one point on the circumference of the transfer cylinder 1, by means of which the write head 6 generates latent images on the transfer cylinder 3, e.g. B. in the form of charge distributions that correspond to the desired print images.
  • the latent images are developed by a schematically shown inking unit 7 in accordance with the charge distribution by selectively applying printing ink to the transfer cylinder 3, and the developed images are then transferred to the sheets 2 by more or less strong pressure and fixed thereon by means not shown.
  • the transfer cylinder 3 (and correspondingly the impression cylinder 5) is not mounted at right angles to the transport direction P on the printing press, but rather at an angle to it, as can be seen in the top view of FIG. 2. Since the sheets 2 lie at right angles on the conveyor belt 1, ie with their front edge 8 perpendicular to the transport direction P, the axis 4 of the transfer cylinder 3 forms a small angle ⁇ with the front edge 8 of the sheet. While in FIG. 2 an angle ⁇ of approx. 10 ° is drawn, this can also be much smaller in practice.
  • the inclined position of the transfer cylinder 3 ensures that the sheets 2 are less easily detached from the conveyor belt 1 when they leave the printing nip.
  • shocks are avoided when the sheets 2 enter and exit the printing nip. Such shocks are avoided particularly reliably if a distance a between successive sheets 2 is small, so that at least one sheet 2 is in the printing nip at all times.
  • the write head 6, the z. B. is an elongated array that extends across the printable sheet width can be arranged parallel to the axis 4 of the transfer cylinder 3.
  • the image data supplied to the write head 6 must be changed or influenced in accordance with the inclination of the transfer cylinder 3.
  • z. B. the data belonging to imaging elements that are along the circumference of the transfer cylinder 3 closer to the sheet 2, are accordingly delayed to the write head 6.
  • z. B. by angular transformation of an electronically stored template, "oblique" scanning and reading a template, etc.
  • transfer cylinder 3 Just like the transfer cylinder 3, other transfer cylinders can also be tilted for additional colors.
  • the write heads can also be arranged parallel to the leading edge 8 of the sheet, as shown in FIG. 2 on a further transfer cylinder 9, for example by a write head 10 shown in broken lines.
  • a write head 10 shown in broken lines.
  • the image data can be fed to the write head 10 line by line without change, so that the information is processed in exactly the same way as with a transfer cylinder lying straight.
  • the write head 10 need not be set up specifically for this arrangement. Otherwise, write head designs are also conceivable that "nestle" to a certain extent on the transfer cylinder 9.
  • the inking unit 7 can be arranged in a conventional manner, i. H. parallel to the axis of the transfer cylinder 3 or 9.
  • printing units with a plurality of transfer cylinders connected in series can also be used, for example a cylinder, on the circumference of which the print head and the inking unit are arranged, and one thereon rolling further cylinder, which in turn rolls on the sheets or the conveyor belt.
  • a belt rotating around two or more cylinders can be used, on the surface of which the printed images are generated or transferred by an upstream cylinder or belt and then transferred from this surface to the sheets.
  • the cylinder on which the printing ink is transferred from the belt to the sheets is arranged above the conveyor belt in the manner shown in FIG. 2.
  • An alternative embodiment which is not shown in detail, is to arrange the transfer cylinders at right angles to the direction of transport and to design the feeder of the printing press in such a way that the sheets are each conveyed in an inclined position on the conveyor belt, with their longitudinal edges at a small angle to the direction of transport run.
  • the write heads either parallel to the leading edge of the sheet or at right angles to the transport direction and to control them appropriately in each case.

Landscapes

  • Ink Jet (AREA)
  • Handling Of Sheets (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Handling Of Cut Paper (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
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
DE19545113A DE19545113A1 (de) 1995-12-04 1995-12-04 Digitale Druckmaschine und Verfahren zum Bogentransport dafür
DE19545113 1995-12-04

Publications (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Families Citing this family (5)

* 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
BR112018014491A2 (pt) 2016-02-26 2018-12-11 Amcor Flexibles Selestat Sas substrato de embalagem flexível, método para formar um substrato de embalagem impresso e embalagem
JP2019515845A (ja) 2016-03-18 2019-06-13 アムコア フレキスィブルス セレスタ エスエーエス レトルト包装のための印刷されたフレキシブル積層体

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Family Cites Families (21)

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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) *
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
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
KR970033849A (ko) 1997-07-22
US5819667A (en) 1998-10-13
KR100227099B1 (ko) 1999-10-15
DE59605394D1 (de) 2000-07-13
EP0778129B1 (fr) 2000-06-07
JPH09179412A (ja) 1997-07-11
DE19545113A1 (de) 1997-06-05

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