EP0476516A1 - Machine pour imprimer en flexographie ou en rotogravure indirect - Google Patents

Machine pour imprimer en flexographie ou en rotogravure indirect Download PDF

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Publication number
EP0476516A1
EP0476516A1 EP91115426A EP91115426A EP0476516A1 EP 0476516 A1 EP0476516 A1 EP 0476516A1 EP 91115426 A EP91115426 A EP 91115426A EP 91115426 A EP91115426 A EP 91115426A EP 0476516 A1 EP0476516 A1 EP 0476516A1
Authority
EP
European Patent Office
Prior art keywords
printing
unit
central structure
remote station
lateral
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.)
Withdrawn
Application number
EP91115426A
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German (de)
English (en)
Inventor
Gilberto Testi
Adriano Toniolo
Giancarlo Caimmi
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.)
Cmf SpA
Original Assignee
Cmf SpA
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 Cmf SpA filed Critical Cmf SpA
Publication of EP0476516A1 publication Critical patent/EP0476516A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/01—Rotary intaglio printing presses for indirect printing

Definitions

  • the present invention refers to a flexographic or indirect rotogravure printing machine of the type that substantially includes:
  • Printing machines of the above-mentioned type are known, and they are based on the ink transfer from its tray onto the material to be printed by means of pairs of rotating cylinders driven in rotation by drive gears associated with the counterimpression cylinder/s of the central structure.
  • a first cylinder or plate cylinder supports the printing form or plate that is made up of particular polymers and reproduces the subject to be printed in positive relief, while a second cylinder or screened (or Anilox) cylinder is accurately worked and acts on the surface of the first cylinder and is used for applying the amount of ink to be transferred to the printing plate on the plate cylinder.
  • the structure of the two cylinders is different. Instead of a plate cylinder, a solid rubber-covered cylinder is used, and instead of the screened cylinder, a photoengraved copper cylinder is used that reproduces the subject to be printed in negative relief.
  • the feeding of the ink to each pair of rotating cylinders can be carried out by means of a third rotating cylinder.
  • This third cylinder is also rubberized and is partially immersed into a tray holding the liquid ink. At the same time, it is in skimming or close contact with the screened (engraved) cylinder.
  • the feeding of the ink can be carried out by means of an ink tray of the closed chamber type, commonly referred to as a "chambered doctor blade". This last transfers the ink onto the screened cylinders by applying it with a skimming blade.
  • This feeding system allows a better and more accurate application of the ink onto the cylinders, thereby improving the printing quality.
  • productivity capability is not satisfactory. This is due to the fact that, at each job changeover, the maintenance, tooling, presetting and micrometric adjustment operations of the various color stations, necessary for preparing them for the next printing cycle, are made by the operator with the color stations directly on the machine, thus requiring the machine to be in a standstill or down condition, and hence non productive.
  • the total downtime of this type of machine is 225 minutes.
  • a robot is used for movement, such as in unloading the cylinders to be replaced and loading replacement or substitute cylinders.
  • time valuations indicated above are made with respect to complete job changeovers, such as the ones indicated by the sequences A), B) and C) .
  • these sequences can be simplified, as it is not always necessary to carry out each listed intervention at every job changeover. Therefore, the referred examples are indicative and serve only as parameters in the evaluating the benefits of the proposed invention.
  • a main object of the invention is to provide a new flexographic or indirect rotogravure printing machine that offers a drastic reduction in downtime associated with the tooling operation and the presetting the color stations at each job changeover, thereby greatly increasing machine productivity.
  • Another object is to supply a machine of the above-mentioned type in which the tooling and presetting operations can occur in a place more accessible and therefore more efficient and safe for the operator's work, resulting in a reduction of work accidents and improved maintenance on the machine.
  • a machine structure is carried out that allows for the tooling and presetting operations of the printing units to be performed at a remote place far from the machine and therefore while the same machine continues to work, thereby increasing the productivity thereof by reducing the downtimes to only that necessary for the exchanging of the printing units between the central structure and the remote station at the time of each job changeover.
  • the simulation apparatus includes some shapes that simulate both the counterimpression cylinder or cylinders and the transmission means of the system of rotating cylinders belonging to the color stations.
  • the shapes of the simulation apparatus are located in a fixed position and, for each printing units are formed of a rigid cylindrical sector, or by a series of rigid cylindrical sectors, and also include a series of rigid toothed sectors simulating the gear/gears used for driving the rotating cylinders of the printing unit at color stations.
  • a simulation cylindrical sector or series of simulation cylindrical sectors are used considering whether the central structure includes a central cylinder or a plurality of independent counterimpression cylinders.
  • the remote station is located in the same plane of the lower level of the central structure, in a position in front of, and in axial alignment with, the central structure.
  • the remote station has three working positions: a central or intermediate position for unloading/loading the printing unit to be replaced and the substitute printing unit, and two lateral opposed positions for performing, respectively, the maintenance and/or tooling operation and the presetting operations on the substitute printing unit.
  • the flexographic printing machine includes known features of a single central counterimpression cylinder or central drum CC and six color stations or color groups G1,G2,G3 and G4,G5,G6, located on the two sides of the drum for the application of single colors, according to the prefixed sequence, onto the material to be printed.
  • Drum CC serves the function of supporting and driving the material that is fed into the machine in the form of a band NA, and can be made by any material suitable for being printed; for example, it could be a polypropylene film for the packing of foodstuffs, such as pastry, deep-freezed foods, etc. , paper for the packing of animal feed, or cardboard for packing drinks, fruit suices, etc..
  • Band NA is supplied by an unwinding device for a roll of the unprinted material and, after its printing, it passes through a drying system for the drying of the ink dilution solvent. Finally, it is rewound onto a printed band bobbin or printed roll that represents the finished product of the machine.
  • a drying system for the drying of the ink dilution solvent.
  • the central drum CC and its driving gear D (see Figure 2) and related driving transmission (not represented) form the fixed central structure SC of the machine that is mounted onto a support that includes lower support BA and two lateral uprights supports MO.
  • Each color station has two rotating cylinders indicated by CP1,CR1;CP2,CR2...CP6,CR6, for the transfer of the printing subject and ink onto band NA, and a feeding system for the liquid, described in the following paragraphs.
  • the cylinders CP1,CP2,...CP6 are plate cylinders, while the cylinders CR1,CR2,...CR6 are screened cylinders having a surface formed by a plurality of cells for receiving the ink and traspor- ting it, in a batched quantity, to the plate cylinders with which the screened cylinders are in rotating contact.
  • the ink feeding system for the cylinders operates by means of closed chamber doctor blades RA1,RA2,..RA6, each (chamber) being provided with sliding blade that makes contact with the related screened cylinder.
  • Rotation of the cylinder groups is obtained by the driving gear D of the central drum CC that meshes with the gears DC1..DC6 for driving the plate cylinders CP1..CP6, and on its turn gears DC1...DC6 are also rotatably coupled with the gears DR1...DR6 for driving the screened cylinders CR1...CR6 ( Figure 2). In this manner, all of the pairs of cylinders of the color stations turn in synchronism with the main gear D driving drum CC.
  • the machine shown in Figures 7 and 8 has a different ink feeding system. Instead of the doctor blade, it is used a third either solid rubber or rubber-covered roller CG1,CG2...CG6, that is immersed partially in an ink tray where the ink is supplied to the preferably rubber-covered roller, and on its turn the third cylinder transfers the batched ink to the screened cylinder CR1.CR2...CR6 by contact and sliding.
  • a third either solid rubber or rubber-covered roller CG1,CG2...CG6, that is immersed partially in an ink tray where the ink is supplied to the preferably rubber-covered roller, and on its turn the third cylinder transfers the batched ink to the screened cylinder CR1.CR2...CR6 by contact and sliding.
  • the machine in Figure 8 is also different as regards the central structure.
  • a plurality of independent counterimpression cylinders C1,C2,...C6, in a number equal to the number of color stations, are used for the support and driving of band NA.
  • each plate cylinder CP1,CP2,...CP6 is driven in rotation by the related counterimpression cylinder C1,C2,...C6. It is evident that all of the rotations are also synchronized with one another in this arrangement.
  • Figures 1, 2, 7 and 8 show that the color stations G1,G2,...G6 are located near central drum CC ( Figures 1, 2 and 7) or near the independent cylinders C1,C2,...C6 ( Figures 7, 8), when the machine is in its work or printing position. Nevertheless, before starting the machine and at each job changeover, each color station must be prepared or arranged for the desidered printing cycle, that is, it must be subjected to the necessary tooling, presetting and micrometric adjustment operations as indicated in the preceding paragraphs A), B) and C).
  • the machine includes two independent printing units U1 and U2 (Fig.3) located at the two sides of the central structure SC, each unit containing the individual stations on the entire side of the structure, that is, the unit U1 includes color stations G1,G2 and G3 and the unit U2 includes color stations G4,G5 and G6.
  • Printing units U1 and U2 are connected to the central structure SC while the machine is running ( Figures 1, 2) but, at each job changeover, they are released and moved away from the central structure to allow for their replacement with another two units (substitute units) already prepared for the new printing cycle, as they have earlier been tooled or made ready and preset during a time in which the machine continued to operate.
  • the above-mentioned operations of tooling and presetting of the removed units are made in a place or location far from the machine, referred to as a remote station.
  • the location is selected to satisfy conditions that provide for the best access, as well as meet praticality and safety concerns for the operator.
  • the remote station is located on the same horizontal plane of the lower support BA (Fig.1) of the central structure and is positioned in front of, and in alignment with, the same central structure. It includes three operative positions for each printing unit ( Figures 4, 5 and 6): a central or intermediate position PC for the input (unloading) of the unit to be replaced (replacement unit) and for the delivery (loading) of the substitute unit, and two lateral opposite positions PA, PR, both being in alignment with central position PC for conducting the maintenance/tooling and presetting operations on the unit.
  • the last operation is carried out with the aid of a simulation apparatus AS that operatively simulates the parts of the central structure SC with which the units are to be coupled.
  • this apparatus includes two fixed central shapes formed by mutually facing cylindrical sectors CC1 and CC2 that simulate the central drum CC of the machine to which the units are to be operatively connected.
  • the apparatus also includes, along a side of each central shape, shapes formed by areas of three fixed tooth sectors, namely D1, D2, D3 for the cylindrical sector CC1 and D4, D5, D6 for the cylindrical sector CC2, each simulating the toothing of the driving gear D (Figs. 2 and 3) or other drive means for the plate cylinders CP1, CP2...CP6 of the color stations G1,G2,...G6 ( Figures 4 and 5).
  • These shapes of cylindrical sectors CC1, CC2 and toothed sectors D1...D6 are mounted onto a support BA', MO' similar to the support BA, MO of the central structure SC.
  • the movements that the printing units must make for reaching the remote station SR and then being located in the three positions PC, PA and PR of that station, and finally for returning to a printing position near the central structure, are controlled by control and guide means that operate the traverses of the units.
  • the paths and movements thereover depend only on the practical exigencies of the plant.
  • This traverse occurs under the action of a properly geared motor unit (not represented) that acts, by means of a suitable transmission, with the rollers RU mounted on the base of each support S1, S2 of the respective printing units, each support sliding onto fixed lateral guides GL, located in the same horizontal plane of lower support BA of the central structure.
  • a properly geared motor unit (not represented) that acts, by means of a suitable transmission, with the rollers RU mounted on the base of each support S1, S2 of the respective printing units, each support sliding onto fixed lateral guides GL, located in the same horizontal plane of lower support BA of the central structure.
  • the units When the units are at their waiting position ST, they are each located over a related transport trolley CT that is provided, on the upper part, of fixed lateral guides GL', in alignment with guides GL.
  • Each trolley is provided, in the lower part with rollers RC sliding along fixed axial guides GA, perpendicular to the lateral guides GL, located between said waiting position ST, and the central position PC of the remote station SR, and in this manner the trolley transports the unit.
  • the related geared motor in again driven causing the unit to be moved to the external lateral position PA, where it is submitted to the maintenance and tooling operations.
  • This traverse occurs by means of the sliding of unit rollers RU onto lateral guides GL' of the trolley and, as described further below, onto the aligned lateral guides GLA of the remote station SR that obviously are parallel to the lateral guides GL of the central structure.
  • each trolley CT has been moved from the waiting position ST to the central position PC of remote station SR for allowing passage of the already tooled or made-ready unit from the external lateral position PA to the internal lateral position PR, and then being brought again from the position PC to the waiting or parking position ST, awaiting the repetition of the above-mentioned steps at the next job changeover.
  • unit geared motors and control means of the trolley can be completely or partially automated.
  • the machine's downtime at each job changeover is pratically reduced to the times required for the traverses of the units from the central structure SC to the remote station SR and vice versa, since the tooling and presetting operations of the substitute unit, operations that require longer times, occur at the remote station SR while the machine is still running and remaining productive.
  • the replacement time of printing units is on the order of 5-6 minutes.
  • the first machine includes a central structure SC1 and the two lateral units U1 and U2, and the second machine includes a central structure SC2 and two lateral units U3 and U4.
  • Remote station SR is located centrally between the two structures SC1 and SC2 and with the simulation apparatus AS being aligned with the axles of the central drums CC of said structures.
  • the printing units U1, U2, U3 and U4 are substantially identical with one another except the plate cylinders CP1..CP6 and CP1'...CP6', on which the plates corresponding to the subjects to be printed are applied.
  • the printing units U1,U2 and U3,U4 are shown operationally connected with the related central structures SC1 and SC2, while the two substitute units US are shown on the trolleys CT in the central position PC of remote station SR.
  • the remote station can be of the rotating or oscillating platform type, provided that in either case, the station is suitable for placing the units in the positions necessary for carrying out the maintenance and/or tooling operation and presetting operations on the units.
  • a very technocally advanced form of the plant foresees that the traverses of the unit from one position to another position can be made by means of robots and, in that case, the double remote stations or the single remote station can be located in positions that are not necessarily in the same plane as lower support BA of the machine.
  • a simplified variant of the machine uses a push handling of the units and trolleys, with the advantage of a plant cost reduction, but with the disadvantage of increasing the job changeover times.
  • a more advanced variant incorporates a machine type with the handling of units and trolleys obtained by means of a computer-aided system that is activated by consent signals from sensors activated by traverses, for control of the movement of trolleys and units according to prefixed sequences.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP91115426A 1990-09-17 1991-09-12 Machine pour imprimer en flexographie ou en rotogravure indirect Withdrawn EP0476516A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2149390 1990-09-17
IT02149390A IT1252305B (it) 1990-09-17 1990-09-17 Macchina da stampa flessografica o rotocalco indiretto.

Publications (1)

Publication Number Publication Date
EP0476516A1 true EP0476516A1 (fr) 1992-03-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91115426A Withdrawn EP0476516A1 (fr) 1990-09-17 1991-09-12 Machine pour imprimer en flexographie ou en rotogravure indirect

Country Status (2)

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EP (1) EP0476516A1 (fr)
IT (1) IT1252305B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2128892A1 (es) * 1995-04-28 1999-05-16 Comexi Sa Maquina para la impresion flexografica en varios colores con prerregistro automatico de impresion de los distintos colores.
EP1016522A1 (fr) * 1998-12-29 2000-07-05 Paper Converting Machine Company Dispositif de changement rapide pour une machine à imprimer
DE10024350A1 (de) * 2000-05-17 2001-11-22 Bhs Druck Veredelungstech Wechsel-Druckwerk für Druckmaschinen zur Umrüstung zwischen Flexodruck- und Tiefdruck-Betrieb
EP1683633A1 (fr) * 2005-01-24 2006-07-26 Gallus Ferd. Rüesch Ag Unité d'impression en creux pour imprimer sur bande dans une machine d'impression
ES2319952A1 (es) * 2008-09-29 2009-05-14 Neopack, S.L. Maquina impresora y grupo impresor para offset de formato variable.
CN100577417C (zh) * 2005-01-24 2010-01-06 捷拉斯·F·吕施公司 用于卷筒承印材料的印刷的凹版印刷装置、凹版印刷装置组件及印刷机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1003887A (en) * 1960-11-21 1965-09-08 Ver Farbereien Ag Improvements relating to machines for printing travelling webs of material
FR2420426A1 (fr) * 1978-03-22 1979-10-19 Chambon Machines Imprimeuse rotative a plusieurs couleurs et a format variable
EP0186862A2 (fr) * 1984-12-20 1986-07-09 J.G. Mailänder GmbH & Co. Machine d'impression rotative du type à satellite

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1003887A (en) * 1960-11-21 1965-09-08 Ver Farbereien Ag Improvements relating to machines for printing travelling webs of material
FR2420426A1 (fr) * 1978-03-22 1979-10-19 Chambon Machines Imprimeuse rotative a plusieurs couleurs et a format variable
EP0186862A2 (fr) * 1984-12-20 1986-07-09 J.G. Mailänder GmbH & Co. Machine d'impression rotative du type à satellite

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2128892A1 (es) * 1995-04-28 1999-05-16 Comexi Sa Maquina para la impresion flexografica en varios colores con prerregistro automatico de impresion de los distintos colores.
EP1016522A1 (fr) * 1998-12-29 2000-07-05 Paper Converting Machine Company Dispositif de changement rapide pour une machine à imprimer
EP1352737A3 (fr) * 1998-12-29 2004-02-04 Paper Converting Machine Company Procédé de changement rapide pour une machine à imprimer
EP1559547A2 (fr) * 1998-12-29 2005-08-03 Paper Converting Machine Company Ensemble chariot pour un groupe d'impression en couleur d'une presse flexographique
EP1559547A3 (fr) * 1998-12-29 2006-05-31 Paper Converting Machine Company Ensemble chariot pour un groupe d'impression en couleur d'une presse flexographique
DE10024350A1 (de) * 2000-05-17 2001-11-22 Bhs Druck Veredelungstech Wechsel-Druckwerk für Druckmaschinen zur Umrüstung zwischen Flexodruck- und Tiefdruck-Betrieb
EP1683633A1 (fr) * 2005-01-24 2006-07-26 Gallus Ferd. Rüesch Ag Unité d'impression en creux pour imprimer sur bande dans une machine d'impression
CN100577417C (zh) * 2005-01-24 2010-01-06 捷拉斯·F·吕施公司 用于卷筒承印材料的印刷的凹版印刷装置、凹版印刷装置组件及印刷机
ES2319952A1 (es) * 2008-09-29 2009-05-14 Neopack, S.L. Maquina impresora y grupo impresor para offset de formato variable.
WO2010034855A1 (fr) * 2008-09-29 2010-04-01 Neopack, S.L. Machine d'impression et groupe d'impression pour offset à format variable
US8746141B2 (en) 2008-09-29 2014-06-10 Neopak, Sl Printing machine and printing group for variable format offset

Also Published As

Publication number Publication date
IT9021493A0 (it) 1990-09-17
IT9021493A1 (it) 1992-03-17
IT1252305B (it) 1995-06-08

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