EP2091735B1 - Printing machine and corresponding method - Google Patents

Printing machine and corresponding method Download PDF

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Publication number
EP2091735B1
EP2091735B1 EP07870236.2A EP07870236A EP2091735B1 EP 2091735 B1 EP2091735 B1 EP 2091735B1 EP 07870236 A EP07870236 A EP 07870236A EP 2091735 B1 EP2091735 B1 EP 2091735B1
Authority
EP
European Patent Office
Prior art keywords
traction
printing
roller
press according
web
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.)
Not-in-force
Application number
EP07870236.2A
Other languages
German (de)
French (fr)
Other versions
EP2091735A2 (en
Inventor
Alain Blanchard
Roger Stanchina
Bernard Beranger
Antoine Chevalier
Pascal Ollivier
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.)
Goss International Montataire SA
Original Assignee
Goss International Montataire 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 Goss International Montataire SA filed Critical Goss International Montataire SA
Publication of EP2091735A2 publication Critical patent/EP2091735A2/en
Application granted granted Critical
Publication of EP2091735B1 publication Critical patent/EP2091735B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F22/00—Means preventing smudging of machine parts or printed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0403—Drying webs
    • B41F23/0406—Drying webs by radiation
    • B41F23/0413—Infra-red dryers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/517—Drying material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/33—Rotary suction means, e.g. roller, cylinder or drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/20—Avoiding or preventing undesirable effects
    • B65H2601/25—Damages to handled material
    • B65H2601/251—Smearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • the present invention relates to a rotary printing machine, of the type comprising the features of the preamble of claim 1.
  • Rotary printing machines are known in the state of the art, which comprise at least one printing unit provided with a pair of printing rolls, and a cutting device adapted to cut the printed tape by the printing unit.
  • Known printing machines further include a dryer disposed between the last printing unit and the cutting device. This dryer is used to dry the ink which is arranged on the printed tape, to avoid marking the sheets in the cutting device.
  • the present invention aims to overcome these disadvantages, and to provide a printing machine that has a small footprint.
  • Another object of the invention is to provide a printing press which enables the production of high quality printed products for given expenses.
  • the subject of the invention is a printing machine having the features of claim 1.
  • the document EP 415882 describes a pull unit for a printing machine. Each pulling unit has a single pulling roll which is arranged on one side of the print tape. A single traction unit 20, 21 is arranged both upstream and downstream of a printing unit in order to be able to move the print tape back and forth.
  • the printing machine comprises one or more of the features set forth in claims 2 to 21.
  • the invention further relates to a printing method of the type comprising the steps of claim 22.
  • FIG. 1 On the figure 1 is shown a rotary printing machine according to the invention, designated by the general reference 2.
  • the printing machine 2 comprises a unwinder 4, four printing units 6, a traction device 8 and a cutting device 10.
  • the printing machine 2 could comprise any number of printing units 6, theory, from one to n.
  • Each printing unit 6 comprises an ink device 6A which is provided with an ink tank 7 comprising ink 7A intended for printing on the strip 12.
  • the ink 7A used in the context of the invention will be explained below.
  • Each ink device 6A further comprises an ink transfer roller 7B for transferring the ink 7A to printing rolls 15 (see below).
  • the unwinder 4 is adapted to unwind a continuous printing tape 12.
  • the printing tape 12 is a coated paper web.
  • Coated paper is a paper that includes a coating layer, for example, kaolin or chalk, improving the mechanical or optical properties of the paper.
  • This paper makes it possible to obtain a printed product of high quality.
  • the printing machine 2 defines a print path of the web 12 between the unwinder 4, through the printing units 6 and the pulling device 8, to the cutting device 10.
  • the printing units 6 comprise printing rollers 15 which are adapted to print on the web 12.
  • the cutting device 10 is adapted to cut the print tape 12 into individual sheets.
  • the traction device 8 is located downstream of the printing unit 6 furthest downstream and upstream of the cutting device 10. This traction device 8 is adapted to apply a determined mechanical tension on the strip 12 coming out of the printing unit 6 furthest downstream.
  • the printing machine 2 can carry the printed tape 12 in free suspension and in the ambient air all the way between the printing unit 6 the most downstream and the traction device 8.
  • the machine 2 is also adapted to transport the printed tape 12 to the ambient air all the way between the traction device 8 and the cutting device 10.
  • the printing machine 2 has no dryer and has a small footprint.
  • the printing machine 2 differs from the printing machine 2 shown on the figure 1 in that between the traction device 8 and the cutting device 10 is arranged an infrared ray dryer 14 through which the printed strip 12 is conducted.
  • the dryer 14 has dimensions that are small compared to the state dryers. of the technique.
  • the printed strip 12 consists of a succession of strip sections 16, each of which is the length of a sheet cut by the cutting device 10. Each section 16 furthermore comprises an image 18 printed on both sides by the rolls of printing printing units 6. Moreover, each section 16 comprises an unprinted area, which does not contain ink.
  • the traction device 8 comprises two traction rollers 20, 22 which are rotated about their respective axes X-X, Y-Y. Each of the pull rollers 20, 22 comes into contact with one of the surfaces of the printed web 12. The pull rollers 20, 22 are driven in opposite directions, and their traction surface moves, at the location of contact with the strip 12, in the same direction S as the printed strip 12. Each of the traction rollers 20, 22 has an outer surface whose circumference is identical to the length of the strip section 16, which reduces the marking. In a variant, the circumference is identical to an integer multiple of the length of the section 16.
  • each pull roller 20, 22 is made of an ink repellent material used to print the images 18.
  • the pull rollers 20, 22 include, for example, a surface hydrophilic.
  • One of the two rolls is coated with an elastomer.
  • the generatrix of contact of the two rollers makes it possible to pinch to pull the paper strip 12.
  • the surfaces of the two traction rollers 20, 22 may for example comprise a coating of a silicone-based compound.
  • the two traction rollers 20, 22 are arranged facing each other, so that the contact line of the traction roller 20 with the belt 12 and the line of contact of the traction roller 22 with the belt 12 are located in vis-à-vis.
  • the circumferential speed of the traction rollers 20, 22 is slightly greater than the circumferential speed of the printing rollers of the printing unit 6 furthest downstream, so that the printed band 12 is maintained under a traction and therefore a predetermined mechanical tension between the printing unit 6 and the traction device 8.
  • the traction device 8 makes it possible to print a strip of paper and to receive it in a cutting device 10, such as a flat exit, without drying the paper strip 12 by evaporation of the ink solvents.
  • the image 18 is printed by the ink 7A contained in the ink tank 7.
  • the ink 7A is a secative ink, or a waterless ink ("waterless"), or a two-component ink .
  • the drying of the secant inks is the combination of a first phenomenon called “penetration into the support” and a second phenomenon called "the oxidation polymerization of varnishes consisting of oils and resins".
  • the heat-set inks dry by evaporation of the mineral solvents mixed with the resin.
  • the UV inks dry by polymerization of the resin under the effect of ultraviolet radiation.
  • the waterless inks are used with specific printing plates to define non-printing areas without using the conventional lithographic process based on the rejection of the greasy ink by a previously moistened hydrophilic surface.
  • the use of these inks can be considered in the same way as the conventional secundant inks previously seen and can dispense with a dryer, or design less cumbersome.
  • the two traction rollers 20, 22 are arranged apart from each other, so that they define a substantially S-shaped path of the printed strip 12.
  • the S-shaped arrangement makes it possible to increase the winding arc of the band on the driven rollers and thus to promote the efficiency of the traction module by capstan effect.
  • Another device must then be associated with this traction module. This device must make it possible to create a low but sufficient downstream voltage to induce an upstream voltage sufficiently high to pull the band at the output of the last printing unit.
  • the figure 5 shows a detail of a third embodiment of a traction device 8 according to the invention, which differs from the embodiment of the figure 3 by what follows. Similar elements bear the same references.
  • the traction module 8 further comprises two cleaning devices 30, 32. Thus, the quality of the image 18 on the printed tape 12 is further improved.
  • the cleaning devices 30, 32 comprise cleaning bars 34, 36 in permanent contact with the traction surface of the rollers 20, 22.
  • the cleaning bars 34, 36 may comprise a rotating brush placed in contact with each other. the surface to be cleaned or a strip of tissue brought into contact by a mechanical member. In both cases, the cleaning is facilitated by the action of a solvent.
  • FIG. 6 On the figure 6 is shown a fourth embodiment of the traction device 8, in side view. This embodiment differs from the third embodiment by the following.
  • Both pull rollers 20, 22 have ink-repelling surfaces, such as a coating of a silicone-based compound.
  • the cleaning device 30 comprises a cleaning roller 38 comprising a surface of an ink-attracting material which is in contact with the surface of the traction roller 20.
  • the cleaning roller 38 is, for example, coated with a porous ceramic intended for cleaning. to be impregnated with ink and thus has surface properties favorable to the transfer of the ink. This technique is used in particular to make inkwell rolls.
  • the cleaning device 30 further comprises a doctor blade 42 which is in permanent contact with the surface of the cleaning roller 38 and which conveys the ink taken by the roller 38 to a recovery tank 46.
  • the cleaning device 32 further comprises a cleaning roll 40 comprising a surface of an ink attracting material, such as a coating of a porous ceramic to be impregnated with ink and thus having favorable surface properties to the ink. ink transfer.
  • the surface of the roller 40 is in contact with the surface of the pulling roll 22.
  • the cleaning device 32 further comprises a doctor blade 44 which is in permanent contact with the surface of the cleaning roll 40 and which conveys the ink picked up by the rollers 40 to a recovery tank 48.
  • FIG. 7 there is shown a fifth embodiment of the traction device 8, which comprises a variant of the cleaning devices 30, 32.
  • Each cleaning device 30, 32 comprises two cleaning rollers 38, 40 attracting the ink, as well as for each of the cleaning rollers 38, 40, a washing device 50, 52:
  • the washing device 50, 52 is disposed at a distance a from the surface of the associated pulling roll 20, 22 which is larger than the diameter of the corresponding cleaning roll 38, 40.
  • Each cleaning roll 38, 40 is movable between a position cleaning device in which it is in contact with the associated traction roller 20, 22 and a washing position in which it is in contact with the washing device 50, 52 associated.
  • the two cleaning rollers 38, 40 of each cleaning device 30, 32 are controlled in such a way as to come into alternate contact with the associated traction roller 20, 22.
  • the device described in FIG. fig.7 has an advantage over the device described in Fig. 6 . Indeed, assuming that the cleaning can, by contamination with the washing solvent, temporarily modify the properties of the surfaces of the rollers 20 and 22 (ink rejection), this operation is carried out, in the case of the device of the figure 7 , sure rollers 38 and 40 which are not in contact with the traction rollers 20 and 22.
  • FIG. 8A to 8C is shown a sixth embodiment of a traction module 8 according to the invention.
  • This traction device comprises two traction rollers 20, 22 which are arranged on one side of the printed strip 12 one behind the other.
  • the traction device 8 further comprises two clamping rollers 54, 56 which are arranged on the other side of the printing band 12 and which have a smaller diameter than the diameter of the traction rollers 20, 22.
  • Each of the clamping rollers 54, 56 is adapted to apply to the printed tape 12.
  • Each clamping roll 54, 56 is, in combination with the associated pulling roller 20, 22 adapted to clamp the printed web 12.
  • the traction rollers 20, 22 are adapted to alternatively come into contact with the printed band 12.
  • the pulling device further comprises, for each pulling roller 20, 22 a washing device 50, 52.
  • Each washing device 50, 52 is located at a distance a from the surface of the printed strip 12 which is greater than the diameter of the associated traction roller 20, 22. When the traction roller 20, 22 is out of contact with the printed web 12, these washing devices 52, 52 wash the surface of the traction roller 20, 22.
  • the figure 8A shows the step in which the pull roller 20 is being cleaned by the washing device 50.
  • the clamping roller 54 is away from the surface of the belt 12.
  • the pull roller 22 is away from the scrubber 52 and is applied to the surface of the printed tape 12.
  • the crimping roller 56 also applies to the tape 12, so that the tape 12 is clamped between the crimping roller 56 and the traction roller 22.
  • the Figure 8B shows an intermediate step, after the end of the cleaning of the traction roller 20. During this step, the two traction rollers 20, 22 are in contact with the band 12, and the clamping rollers 54, 56 also apply to the bandaged.
  • the device described in fig.8A, 8B, 8C has an advantage over the device described in Fig. 6 . Indeed, assuming that the cleaning can, by contamination with the washing solvent, temporarily modify the properties of the surfaces of the rollers 20 and 22 (ink rejection), this operation is carried out with the cleaning devices 50 and 52 then that the traction rollers 20 and 22 are not in contact with the band.
  • the figure 9 shows a cross section of a traction roller of a seventh embodiment of a traction module 8 according to the invention.
  • This traction module 8 comprises a traction roller 22 which is provided with a porous wall 60 so as to define a porous traction surface.
  • the pores of the wall 60 are open cells, so that a liquid 62 disposed inside the roller 22 can pass through the wall 60 and come into contact with the printed tape 12.
  • the liquid 62 is for example a mixture of water and silicone.
  • the traction roller 22 further comprises a rotary joint 63 comprising a central liquid feed 64 which opens into the interior of the traction roller 22.
  • the feed 64 is arranged coaxially with the axis YY of the roller traction 22.
  • This traction device 8 comprises two blanket rollers 70 which are applied on both sides of the printed band 12 and which are offset from one another in the direction of travel of the band 12.
  • the traction device 8 further comprises eight toothed rollers 72 connected in pairs by an axis 73.
  • the traction device 8 is provided with four belts or chains 74, each of which is guided around two toothed rollers 72 arranged on one side only.
  • the two belts 74 on one side of the printed web 12 are connected by pull bars 76, which are arranged at a mutual distance on the belt 74 which corresponds to the length of the strip section 16.
  • the traction bars 76 are adapted to apply on both sides on the strip 12, facing each other and to tighten the strip between them. Thus they are adapted to exert traction on the band 12.
  • the bars 76 are driven in synchronism with the strip 12 so that they only apply to the unprinted area of the strip 12.
  • the surface coming into contact with the strip 12 of the strip 76 is preferably elastomeric.
  • the figure 12 represents a part of a variant of a printing machine, comprising an accompanying device 80 disposed between the printing unit 6 furthest downstream and the cutting device 10. 80 is arranged upstream of the traction device 8.
  • This accompanying device 80 comprises two support rollers 82 arranged on one side and the other of the band 12.
  • the support rollers 82 are hollow and comprise a cylindrical wall 83 with an annular section.
  • the wall 83 forms an outer support surface 84.
  • the accompanying device 80 comprises means for creating an air cushion between the support surface 84 and the printed strip 12.
  • These air cushion creation means comprise on the one hand, openings 86 passing through the wall 83 of the roller 82.
  • These openings 86 are arranged, in cross-section, in a secant manner with respect to the own axis AA, BB of the roller 82.
  • the openings 86 have a component directed in the direction of displacement S of the band 12, and this in the direction radially outwards with respect to the own axis AA, BB of the roller 82 considered.
  • the means for creating an airbag comprise two sealing walls 88 disposed inside each support roller 82, these walls 88 applying on the one hand in an airtight manner against the inner surface 89 of the wall 83, and secondly to the central axis of the support roller 82.
  • a pressurized air inlet 90 is connected to the chamber 92 defined by the walls 83 and 88.
  • the support rollers 82 are rotated so that their circumference at the location near the printed band moves in the S direction of the printed web path 12.
  • the opening 86 which is at a given instant in communication with the chamber 92 defined by the walls 83 and 88, allows the air in the chamber 92 to escape, and create an air cushion between the outer surface 84 and the printed tape 12, which guides the printed tape 12.
  • This accompanying device 80 has a single sealing wall 88 per roll 82 which extends around the support roll 82 over substantially its entire circumference, with the exception of a portion facing the printed web 12. No wall The seal extends within the roller 82. This embodiment is easy to manufacture.
  • At least one of the traction rollers 20, 22 has openings in its surrounding surface, and the traction device 8 is provided with a vacuum device adapted to create a vacuum in these openings. This helps guide the band 12.
  • the traction elements comprise traction surfaces which come into contact only with the unprinted zone of the strip 12.
  • the traction elements may comprise a traction roller which applies on an unprinted side area of the strip.

Description

La présente invention concerne une machine d'impression rotative, du type comprenant les caractéristiques du préambule de la revendication 1.The present invention relates to a rotary printing machine, of the type comprising the features of the preamble of claim 1.

On connaît dans l'état de la technique des machines d'impression rotatives, qui comprennent au moins une unité d'impression munie d'une paire de rouleaux d'impression, ainsi qu'un dispositif de découpe adapté pour couper la bande imprimée par l'unité d'impression.Rotary printing machines are known in the state of the art, which comprise at least one printing unit provided with a pair of printing rolls, and a cutting device adapted to cut the printed tape by the printing unit.

Les machines d'impression connues comprennent en outre un sécheur disposé entre la dernière unité d'impression et le dispositif de découpe. Ce sécheur est utilisé pour sécher l'encre qui est disposée sur la bande imprimée, afin d'éviter le marquage des feuilles dans le dispositif de découpe.Known printing machines further include a dryer disposed between the last printing unit and the cutting device. This dryer is used to dry the ink which is arranged on the printed tape, to avoid marking the sheets in the cutting device.

La présence d'un sécheur conduit à un encombrement important de la machine à imprimer, et augmente le coût de la machine d'impression.The presence of a dryer leads to a large footprint of the printing machine, and increases the cost of the printing machine.

La présente invention a pour but de pallier ces inconvénients, et de proposer une machine d'impression qui ait un encombrement réduit.The present invention aims to overcome these disadvantages, and to provide a printing machine that has a small footprint.

De plus, les machines d'impression rotative connues ne sont pas capables d'imprimer sur du papier de qualité élevée. L'invention a en outre pour objet de proposer une presse d'impression qui permette de produire des produits imprimés de haute qualité pour des dépenses données.In addition, known rotary printing machines are not able to print on high quality paper. Another object of the invention is to provide a printing press which enables the production of high quality printed products for given expenses.

A cet effet, l'invention a pour objet une machine d'impression ayant les caractéristiques de la revendication 1.For this purpose, the subject of the invention is a printing machine having the features of claim 1.

Le document EP1 464 489 décrit les caractéristiques du préambule de la revendication 1.The document EP1 464 489 describes the features of the preamble of claim 1.

Le document EP 415882 décrit une unité de traction pour une machine d'impression. Chaque unité de traction comporte un seul rouleau de traction qui est disposé d'un seul côté de la bande à imprimer. Une seule unité de traction 20, 21 est disposée aussi bien en amont qu'en aval d'une unité d'impression afin de pouvoir déplacer la bande à imprimer en va et vient.The document EP 415882 describes a pull unit for a printing machine. Each pulling unit has a single pulling roll which is arranged on one side of the print tape. A single traction unit 20, 21 is arranged both upstream and downstream of a printing unit in order to be able to move the print tape back and forth.

Les documents USS2 55606 et DE 19725505 décrivent un dispositif de traction pour une presse avec son dispositif de nettoyage.The documents USS2 55606 and DE 19725505 describe a traction device for a press with its cleaning device.

Les documents GB2139606 et EP93052 décrivent du papier couché.The documents GB2139606 and EP93052 describe coated paper.

Selon les modes de réalisation particuliers, la machine d'impression comporte une ou plusieurs des caractéristiques indiquées dans les revendications 2 à 21.According to particular embodiments, the printing machine comprises one or more of the features set forth in claims 2 to 21.

L'invention a en outre pour objet un procédé d'impression du type comprenant les étapes de la revendication 22.The invention further relates to a printing method of the type comprising the steps of claim 22.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :

  • la figure 1 est une vue schématique de côté d'une machine d'impression selon l'invention ;
  • la figure 2 est une vue correspondant à la vue de la figure 1, d'une variante d'une machine d'impression selon l'invention ;
  • la figure 3 est une vue en perspective d'un détail d'un dispositif de traction selon un premier mode de réalisation de l'invention ;
  • les figures 4 et 5 sont des vues de détail correspondant à la vue de la figure 3, des deuxième et troisième modes de réalisation d'un dispositif de traction selon l'invention ;
  • les figures 6 et 7 sont des vues de côté des quatrième et cinquième modes de réalisation d'un module de traction selon l'invention ;
  • les figures 8A à 8C sont des vues de côté d'un détail d'un module de traction selon un sixième mode de réalisation de l'invention, pendant des étapes différentes de fonctionnement ;
  • la figure 9 est une vue en coupe d'un rouleau de traction d'un module de traction selon un septième mode de réalisation de l'invention ;
  • la figure 10 est une vue schématique de côté d'un détail d'un module de traction selon un huitième mode de réalisation ;
  • la figure 11 est une vue de dessus du détail de la figure 10 ;
  • la figure 12 est une vue de côté schématique d'une machine d'impression selon une seconde variante, comprenant un dispositif d'accompagnement de la bande imprimée ; et
  • les figures 13 et 14 sont des vues de côté des premier et deuxième modes de réalisation du dispositif d'accompagnement.
The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which:
  • the figure 1 is a schematic side view of a printing machine according to the invention;
  • the figure 2 is a view corresponding to the view of the figure 1 , a variant of a printing machine according to the invention;
  • the figure 3 is a perspective view of a detail of a traction device according to a first embodiment of the invention;
  • the figures 4 and 5 are detailed views corresponding to the view of the figure 3 second and third embodiments of a traction device according to the invention;
  • the figures 6 and 7 are side views of the fourth and fifth embodiments of a traction module according to the invention;
  • the Figures 8A to 8C are side views of a detail of a traction module according to a sixth embodiment of the invention, during different stages of operation;
  • the figure 9 is a sectional view of a traction roller of a traction module according to a seventh embodiment of the invention;
  • the figure 10 is a schematic side view of a detail of a traction module according to an eighth embodiment;
  • the figure 11 is a top view of the detail of the figure 10 ;
  • the figure 12 is a schematic side view of a printing machine according to a second variant, comprising a device for accompanying the printed band; and
  • the Figures 13 and 14 are side views of the first and second embodiments of the accompanying device.

Sur la figure 1 est représentée une machine d'impression rotative selon l'invention, désignée par la référence générale 2.On the figure 1 is shown a rotary printing machine according to the invention, designated by the general reference 2.

La machine d'impression 2 comprend un dérouleur 4, quatre unités d'impression 6, un dispositif de traction 8 et un dispositif de découpe 10. La machine d'impression 2 pourrait comprendre un nombre quelconque d'unités d'impression 6, en théorie, de un à n.The printing machine 2 comprises a unwinder 4, four printing units 6, a traction device 8 and a cutting device 10. The printing machine 2 could comprise any number of printing units 6, theory, from one to n.

Chaque unité d'impression 6 comporte un dispositif encreur 6A qui est muni d'un réservoir d'encre 7 comprenant de l'encre 7A prévue pour l'impression sur la bande 12. L'encre 7A utilisée dans le cadre de l'invention sera expliquée ci-dessous. Chaque dispositif encreur 6A comprend en outre un rouleau de transfert d'encre 7B pour le transfert de l'encre 7A à des rouleaux d'impression 15 (voir ci-après).Each printing unit 6 comprises an ink device 6A which is provided with an ink tank 7 comprising ink 7A intended for printing on the strip 12. The ink 7A used in the context of the invention will be explained below. Each ink device 6A further comprises an ink transfer roller 7B for transferring the ink 7A to printing rolls 15 (see below).

Le dérouleur 4 est adapté pour dérouler une bande à imprimer continue 12.The unwinder 4 is adapted to unwind a continuous printing tape 12.

Selon l'invention, la bande à imprimer 12 est une bande de papier couché.According to the invention, the printing tape 12 is a coated paper web.

Le papier couché est un papier qui comprend une couche de revêtement, par exemple en kaoline ou en craie, améliorant les propriétés mécaniques ou optiques du papier.Coated paper is a paper that includes a coating layer, for example, kaolin or chalk, improving the mechanical or optical properties of the paper.

Ce papier permet d'obtenir un produit imprimé de haute qualité.This paper makes it possible to obtain a printed product of high quality.

La machine d'impression 2 définit un trajet d'impression de la bande 12 entre le dérouleur 4, à travers les unités d'impression 6 et le dispositif de traction 8, jusqu'au dispositif de découpe 10.The printing machine 2 defines a print path of the web 12 between the unwinder 4, through the printing units 6 and the pulling device 8, to the cutting device 10.

Les unités d'impression 6 comprennent des rouleaux d'impression 15 qui sont adaptés pour imprimer sur la bande 12.The printing units 6 comprise printing rollers 15 which are adapted to print on the web 12.

Le dispositif de découpe 10 est adapté pour découper la bande à imprimer 12 en des feuilles individuelles.The cutting device 10 is adapted to cut the print tape 12 into individual sheets.

Le dispositif de traction 8 est situé en aval de l'unité d'impression 6 le plus en aval et en amont du dispositif de découpe 10. Ce dispositif de traction 8 est adapté pour appliquer une tension mécanique déterminée sur la bande 12 sortant de l'unité d'impression 6 la plus en aval.The traction device 8 is located downstream of the printing unit 6 furthest downstream and upstream of the cutting device 10. This traction device 8 is adapted to apply a determined mechanical tension on the strip 12 coming out of the printing unit 6 furthest downstream.

Comme on le voit sur la figure 1, la machine d'impression 2 peut transporter la bande imprimée 12 en libre suspension et à l'air ambiant sur tout le trajet entre l'unité d'impression 6 la plus en aval et le dispositif de traction 8. En outre, la machine d'impression 2 est aussi adaptée pour transporter la bande imprimée 12 à l'air ambiant sur tout le trajet entre le dispositif de traction 8 et le dispositif de découpe 10. Ainsi, la machine d'impression 2 ne comporte pas de sécheur et a un encombrement faible.As we see on the figure 1 , the printing machine 2 can carry the printed tape 12 in free suspension and in the ambient air all the way between the printing unit 6 the most downstream and the traction device 8. In addition, the machine 2 is also adapted to transport the printed tape 12 to the ambient air all the way between the traction device 8 and the cutting device 10. Thus, the printing machine 2 has no dryer and has a small footprint.

La machine d'impression 2 selon la variante montrée sur la figure 2 diffère de la machine d'impression 2 montrée sur la figure 1 par le fait qu'entre le dispositif de traction 8 et le dispositif de découpe 10 est disposé un sécheur 14 à rayons infrarouges à travers lequel est menée la bande imprimée 12. Le sécheur 14 a des dimensions réduites par rapport aux sécheurs de l'état de la technique.The printing machine 2 according to the variant shown on the figure 2 differs from the printing machine 2 shown on the figure 1 in that between the traction device 8 and the cutting device 10 is arranged an infrared ray dryer 14 through which the printed strip 12 is conducted. The dryer 14 has dimensions that are small compared to the state dryers. of the technique.

Sur la figure 3 est représenté en perspective un détail du dispositif de traction 8 selon l'invention. On voit la bande 12 imprimée. La bande imprimée 12 est constituée d'une succession de tronçons de bande 16, dont chacun à la longueur d'une feuille découpée par le dispositif de découpe 10. Chaque tronçon 16 comporte en outre une imagé 18 imprimée recto verso par les rouleaux d'impression des unités d'impression 6. Par ailleurs, chaque tronçon 16 comporte une zone non imprimée, qui ne comporte pas d'encre.On the figure 3 is shown in perspective a detail of the traction device 8 according to the invention. We see the printed tape. The printed strip 12 consists of a succession of strip sections 16, each of which is the length of a sheet cut by the cutting device 10. Each section 16 furthermore comprises an image 18 printed on both sides by the rolls of printing printing units 6. Moreover, each section 16 comprises an unprinted area, which does not contain ink.

Le dispositif de traction 8 comporte deux rouleaux de traction 20, 22 qui sont entraînés en rotation autour de leurs axes respectifs X-X, Y-Y. Chacun des rouleaux de traction 20, 22 vient en contact avec l'une des surfaces de la bande imprimée 12. Les rouleaux de traction 20, 22 sont entraînés dans des sens opposés, et leur surface de traction se déplace, à l'emplacement de contact avec la bande 12, dans le même sens S que la bande imprimée 12. Chacun des rouleaux de traction 20, 22 a une surface extérieure dont la circonférence est identique à la longueur du tronçon de bande 16, ce qui diminue le marquage. En variante, la circonférence est identique à un multiple de nombre entier de la longueur du tronçon 16.The traction device 8 comprises two traction rollers 20, 22 which are rotated about their respective axes X-X, Y-Y. Each of the pull rollers 20, 22 comes into contact with one of the surfaces of the printed web 12. The pull rollers 20, 22 are driven in opposite directions, and their traction surface moves, at the location of contact with the strip 12, in the same direction S as the printed strip 12. Each of the traction rollers 20, 22 has an outer surface whose circumference is identical to the length of the strip section 16, which reduces the marking. In a variant, the circumference is identical to an integer multiple of the length of the section 16.

La surface extérieure de chaque rouleau de traction 20, 22 est fabriquée en une matière repoussant l'encre utilisée pour imprimer les images 18. Les rouleaux de traction 20, 22 comprennent par exemple une surface hydrophile. L'un des deux rouleaux est revêtu d'un élastomère. La génératrice de contact des 2 rouleaux permet d'assurer un pincement pour tirer la bande de papier 12. Les surfaces des deux rouleaux de traction 20, 22 pourront par exemple comporter une enduction d'un composé à base de silicone.The outer surface of each pull roller 20, 22 is made of an ink repellent material used to print the images 18. The pull rollers 20, 22 include, for example, a surface hydrophilic. One of the two rolls is coated with an elastomer. The generatrix of contact of the two rollers makes it possible to pinch to pull the paper strip 12. The surfaces of the two traction rollers 20, 22 may for example comprise a coating of a silicone-based compound.

Les deux rouleaux de traction 20, 22 sont disposés en vis-à-vis, de telle manière que la ligne de contact du rouleau de traction 20 avec la bande 12 et la ligne de contact du rouleau de traction 22 avec la bande 12 sont situées en vis-à-vis.The two traction rollers 20, 22 are arranged facing each other, so that the contact line of the traction roller 20 with the belt 12 and the line of contact of the traction roller 22 with the belt 12 are located in vis-à-vis.

De manière avantageuse, la vitesse circonférentielle des rouleaux de traction 20, 22 est légèrement supérieure à la vitesse circonférentielle des rouleaux d'impression de l'unité d'impression 6 la plus en aval, de telle manière que la bande imprimée 12 est maintenue sous une traction et donc une tension mécanique prédéterminée entre l'unité d'impression 6 et le dispositif de traction 8.Advantageously, the circumferential speed of the traction rollers 20, 22 is slightly greater than the circumferential speed of the printing rollers of the printing unit 6 furthest downstream, so that the printed band 12 is maintained under a traction and therefore a predetermined mechanical tension between the printing unit 6 and the traction device 8.

Le dispositif de traction 8 permet d'imprimer une bande de papier et de la réceptionner dans un dispositif de découpe 10, tel qu'une sortie à plat, sans sécher cette bande de papier 12 par évaporation des solvants de l'encre.The traction device 8 makes it possible to print a strip of paper and to receive it in a cutting device 10, such as a flat exit, without drying the paper strip 12 by evaporation of the ink solvents.

L'image 18 est imprimée par l'encre 7A contenue dans le réservoir d'encre 7. De manière avantageuse, l'encre 7A est une encre sécative, ou une encre sans eau (« waterless »), ou une encre bi-composante. Le séchage des encres sécatives est la combinaison d'un premier phénomène dit « la pénétration dans le support » et d'un second phénomène dit « l'oxydo-polymérisation des vernis constitués d'huiles et de résines ».The image 18 is printed by the ink 7A contained in the ink tank 7. Advantageously, the ink 7A is a secative ink, or a waterless ink ("waterless"), or a two-component ink . The drying of the secant inks is the combination of a first phenomenon called "penetration into the support" and a second phenomenon called "the oxidation polymerization of varnishes consisting of oils and resins".

Les encres fixables par la chaleur ("heat-set") sèchent par évaporation des solvants minéraux mélangés à la résine. Les encres UV sèchent par polymérisation de la résine sous l'effet d'un rayonnement ultra-violet.The heat-set inks dry by evaporation of the mineral solvents mixed with the resin. The UV inks dry by polymerization of the resin under the effect of ultraviolet radiation.

Les encres sans eau (« waterless ») sont utilisées avec des plaques d'impression spécifiques permettant de définir des zones non imprimantes sans faire appel au procédé lithographique classique fondé sur le refus de l'encre grasse par une surface hydrophile préalablement humidifiée. L'utilisation de ces encres peut être envisagée au même titre que les encres sécatives conventionnelles vues précédemment et permet de se dispenser d'un sécheur, ou de le concevoir de manière moins encombrante.The waterless inks are used with specific printing plates to define non-printing areas without using the conventional lithographic process based on the rejection of the greasy ink by a previously moistened hydrophilic surface. The use of these inks can be considered in the same way as the conventional secundant inks previously seen and can dispense with a dryer, or design less cumbersome.

Sur la figure 4 est représenté un détail d'un deuxième mode de réalisation d'un dispositif de traction 8, qui diffère de la figure 3 par ce qui suit.On the figure 4 is shown a detail of a second embodiment of a traction device 8, which differs from the figure 3 by what follows.

Les éléments analogues portent les mêmes références.Similar elements bear the same references.

Les deux rouleaux de traction 20, 22 sont disposés à l'écart l'un de l'autre, de telle manière qu'ils définissent un trajet sensiblement en S de la bande imprimée 12. La disposition en S permet d'augmenter l'arc d'enroulement de la bande sur les rouleaux entraînés et donc de favoriser l'efficacité du module de traction par effet cabestan. Un autre dispositif devra alors être associé à ce module de traction. Ce dispositif devra permettre de créer une tension aval faible mais suffisante pour induire une tension amont suffisamment élevée pour tirer la bande en sortie du dernier groupe d'impression.The two traction rollers 20, 22 are arranged apart from each other, so that they define a substantially S-shaped path of the printed strip 12. The S-shaped arrangement makes it possible to increase the winding arc of the band on the driven rollers and thus to promote the efficiency of the traction module by capstan effect. Another device must then be associated with this traction module. This device must make it possible to create a low but sufficient downstream voltage to induce an upstream voltage sufficiently high to pull the band at the output of the last printing unit.

La figure 5 montre un détail d'un troisième mode de réalisation d'un dispositif de traction 8 selon l'invention, qui diffère du mode de réalisation de la figure 3 par ce qui suit. Les éléments analogues portent les mêmes références.The figure 5 shows a detail of a third embodiment of a traction device 8 according to the invention, which differs from the embodiment of the figure 3 by what follows. Similar elements bear the same references.

Le module de traction 8 comporte en outre deux dispositifs de nettoyage 30, 32. Ainsi, la qualité de l'image 18 sur la bande imprimée 12 est encore améliorée.The traction module 8 further comprises two cleaning devices 30, 32. Thus, the quality of the image 18 on the printed tape 12 is further improved.

Les dispositifs de nettoyage 30, 32 comprennent des barres de nettoyage 34, 36 en contact permanent avec la surface de traction des rouleaux 20, 22. A titre d'exemple, les barres de nettoyage 34, 36 peuvent comporter une brosse rotative placée au contact de la surface à nettoyer ou une bande de tissus mise au contact par un organe mécanique. Dans les deux cas, le nettoyage est facilité par l'action d'un solvant. Ces techniques sont utilisées en particulier pour le lavage des blanchets sur les rotatives offset.The cleaning devices 30, 32 comprise cleaning bars 34, 36 in permanent contact with the traction surface of the rollers 20, 22. By way of example, the cleaning bars 34, 36 may comprise a rotating brush placed in contact with each other. the surface to be cleaned or a strip of tissue brought into contact by a mechanical member. In both cases, the cleaning is facilitated by the action of a solvent. These techniques are used in particular for washing blankets on offset presses.

Sur la figure 6 est montré un quatrième mode de réalisation du dispositif de traction 8, en vue de côté. Ce mode de réalisation diffère du troisième mode de réalisation par ce qui suit.On the figure 6 is shown a fourth embodiment of the traction device 8, in side view. This embodiment differs from the third embodiment by the following.

Les deux rouleaux de traction 20, 22 comportent des surfaces repoussant l'encre, telles qu'une enduction d'un composé à base de silicone.Both pull rollers 20, 22 have ink-repelling surfaces, such as a coating of a silicone-based compound.

Le dispositif de nettoyage 30 comporte un rouleau de nettoyage 38 comprenant une surface en une matière attirant l'encre, qui est en contact avec la surface du rouleau de traction 20. Le rouleau de nettoyage 38 est par exemple revêtue d'une céramique poreuse destinée à être imprégnée d'encre et présente ainsi des propriétés de surface favorables au transfert de l'encre. Cette technique est utilisée en particulier pour réaliser des rouleaux d'encrier. Le dispositif de nettoyage 30 comporte en outre une racle 42 qui est en contact permanent avec la surface du rouleau de nettoyage 38 et qui achemine l'encre prélevée par le rouleau 38 vers un bac de récupération 46.The cleaning device 30 comprises a cleaning roller 38 comprising a surface of an ink-attracting material which is in contact with the surface of the traction roller 20. The cleaning roller 38 is, for example, coated with a porous ceramic intended for cleaning. to be impregnated with ink and thus has surface properties favorable to the transfer of the ink. This technique is used in particular to make inkwell rolls. The cleaning device 30 further comprises a doctor blade 42 which is in permanent contact with the surface of the cleaning roller 38 and which conveys the ink taken by the roller 38 to a recovery tank 46.

Le dispositif de nettoyage 32 comporte en outre un rouleau de nettoyage 40 comprenant une surface en une matière attirant l'encre, telle qu'un revêtement d'une céramique poreuse destinée à être imprégnée d'encre et présentant ainsi des propriétés de surface favorables au transfert de l'encre. La surface du rouleau 40 est en contact avec la surface du rouleau de traction 22. Le dispositif de nettoyage 32 comporte en outre une racle 44 qui est en contact permanent avec la surface du rouleau de nettoyage 40 et qui achemine l'encre prélevée par les rouleaux 40 vers un bac de récupération 48.The cleaning device 32 further comprises a cleaning roll 40 comprising a surface of an ink attracting material, such as a coating of a porous ceramic to be impregnated with ink and thus having favorable surface properties to the ink. ink transfer. The surface of the roller 40 is in contact with the surface of the pulling roll 22. The cleaning device 32 further comprises a doctor blade 44 which is in permanent contact with the surface of the cleaning roll 40 and which conveys the ink picked up by the rollers 40 to a recovery tank 48.

Sur la figure 7 est représenté un cinquième mode de réalisation du dispositif de traction 8, qui comporte une variante des dispositifs de nettoyage 30, 32. Chaque dispositif de nettoyage 30, 32 comporte deux rouleaux de nettoyage 38, 40 attirant l'encre, ainsi que pour chacun des rouleaux de nettoyage 38, 40, un dispositif de lavage 50, 52:On the figure 7 there is shown a fifth embodiment of the traction device 8, which comprises a variant of the cleaning devices 30, 32. Each cleaning device 30, 32 comprises two cleaning rollers 38, 40 attracting the ink, as well as for each of the cleaning rollers 38, 40, a washing device 50, 52:

Le dispositif de lavage 50, 52 est disposé à une distance a de la surface du rouleau de traction 20, 22 associé qui est supérieure au diamètre du rouleau de nettoyage correspondant 38, 40. Chaque rouleau de nettoyage 38, 40 est mobile entre une position de nettoyage dans laquelle il est en contact avec le rouleau de traction associé 20, 22 et une position de lavage dans laquelle il est en contact avec le dispositif de lavage 50, 52 associé. Les deux rouleaux de nettoyage 38, 40 de chaque dispositif de nettoyage 30, 32 sont commandés de telle manière à venir en contact alternativement avec le rouleau de traction associé 20, 22.The washing device 50, 52 is disposed at a distance a from the surface of the associated pulling roll 20, 22 which is larger than the diameter of the corresponding cleaning roll 38, 40. Each cleaning roll 38, 40 is movable between a position cleaning device in which it is in contact with the associated traction roller 20, 22 and a washing position in which it is in contact with the washing device 50, 52 associated. The two cleaning rollers 38, 40 of each cleaning device 30, 32 are controlled in such a way as to come into alternate contact with the associated traction roller 20, 22.

En d'autres termes, pendant que l'un des rouleaux de nettoyage 38 est en contact avec le rouleau de traction 20, l'autre rouleau de nettoyage 38 est en contact avec le dispositif de lavage 50. De même, pendant que l'un des rouleaux de nettoyage 40 est en contact avec le rouleau de traction 22, l'autre rouleau de nettoyage 40 est en contact avec le dispositif de lavage 52. Le dispositif décrit en fig.7 présente un avantage par rapport au dispositif décrit en fig. 6. En effet, en supposant que le nettoyage puisse, par contamination par le solvant de lavage, temporairement modifier les propriétés des surfaces des rouleaux 20 et 22 (refus de l'encre), cette opération est réalisée, dans le cas di dispositif de la figure 7, sur des rouleaux 38 et 40 qui ne sont pas en contact avec les rouleaux de traction 20 et 22.In other words, while one of the cleaning rollers 38 is in contact with the pull roller 20, the other cleaning roll 38 is in contact with the washing device 50. Similarly, while the one of the cleaning rolls 40 is in contact with the pull roller 22, the other cleaning roller 40 is in contact with the washing device 52. The device described in FIG. fig.7 has an advantage over the device described in Fig. 6 . Indeed, assuming that the cleaning can, by contamination with the washing solvent, temporarily modify the properties of the surfaces of the rollers 20 and 22 (ink rejection), this operation is carried out, in the case of the device of the figure 7 , sure rollers 38 and 40 which are not in contact with the traction rollers 20 and 22.

Sur les figures 8A à 8C est représenté un sixième mode de réalisation d'un module de traction 8 selon l'invention.On the Figures 8A to 8C is shown a sixth embodiment of a traction module 8 according to the invention.

Ce dispositif de traction comporte deux rouleaux de traction 20, 22 qui sont disposés d'un seul côté de la bande imprimée 12 l'un derrière l'autre. Le dispositif de traction 8 comporte en outre deux rouleaux de serrage 54, 56 qui sont disposés de l'autre côté de la bande à imprimer 12 et qui ont un diamètre inférieur au diamètre des rouleaux de traction 20, 22. Chacun des rouleaux de serrage 54, 56 est adapté pour s'appliquer sur la bande imprimée 12.This traction device comprises two traction rollers 20, 22 which are arranged on one side of the printed strip 12 one behind the other. The traction device 8 further comprises two clamping rollers 54, 56 which are arranged on the other side of the printing band 12 and which have a smaller diameter than the diameter of the traction rollers 20, 22. Each of the clamping rollers 54, 56 is adapted to apply to the printed tape 12.

Chaque rouleau de serrage 54, 56 est, en combinaison avec le rouleau de traction 20, 22 associé, adapté pour serrer la bande imprimée 12.Each clamping roll 54, 56 is, in combination with the associated pulling roller 20, 22 adapted to clamp the printed web 12.

Les rouleaux de traction 20, 22 sont adaptés pour alternativement venir en contact avec la bande imprimée 12.The traction rollers 20, 22 are adapted to alternatively come into contact with the printed band 12.

Le dispositif de traction comporte en outre, pour chaque rouleau de traction 20, 22 un dispositif de lavage 50, 52. Chaque dispositif de lavage 50, 52 est situé à une distance a de la surface de la bande imprimée 12 qui est supérieure au diamètre du rouleau de traction associé 20, 22. Lorsque le rouleau de traction 20, 22 est hors contact de la bande imprimée 12, ces dispositifs de lavage 52, 52 lavent la surface du rouleau de traction 20, 22.The pulling device further comprises, for each pulling roller 20, 22 a washing device 50, 52. Each washing device 50, 52 is located at a distance a from the surface of the printed strip 12 which is greater than the diameter of the associated traction roller 20, 22. When the traction roller 20, 22 is out of contact with the printed web 12, these washing devices 52, 52 wash the surface of the traction roller 20, 22.

La figure 8A montre l'étape dans laquelle le rouleau de traction 20 est en train d'être nettoyé par le dispositif de lavage 50. Le rouleau de serrage 54 est à l'écart de la surface de la bande 12. Le rouleau de traction 22 se trouve à l'écart du dispositif de lavage 52 et est appliqué sur la surface de la bande imprimée 12. Le rouleau de serrage 56 s'applique également sur la bande 12, de telle sorte que la bande 12 est serrée entre le rouleau de serrage 56 et le rouleau de traction 22.The figure 8A shows the step in which the pull roller 20 is being cleaned by the washing device 50. The clamping roller 54 is away from the surface of the belt 12. The pull roller 22 is away from the scrubber 52 and is applied to the surface of the printed tape 12. The crimping roller 56 also applies to the tape 12, so that the tape 12 is clamped between the crimping roller 56 and the traction roller 22.

La figure 8B montre une étape intermédiaire, après la fin du nettoyage du rouleau de traction 20. Pendant cette étape, les deux rouleaux de traction 20, 22 sont en contact avec la bande 12, et les rouleaux de serrage 54, 56 s'appliquent également sur la bande.The Figure 8B shows an intermediate step, after the end of the cleaning of the traction roller 20. During this step, the two traction rollers 20, 22 are in contact with the band 12, and the clamping rollers 54, 56 also apply to the bandaged.

Pendant une étape successive, illustrée à la Figure 8C, c'est uniquement le rouleau de traction 20 et le rouleau de serrage 54 qui serrent la bande 12 entre eux, pendant que les rouleaux de traction 22 et de serrage 56 sont hors contact de la bande 12, le rouleau de traction 22 étant nettoyé par le dispositif de nettoyage 52.During a next step, illustrated in Figure 8C it is only the pull roller 20 and the clamping roller 54 that clamp the belt 12 between them, while the pulling and clamping rollers 56 are out of contact with the band 12, the traction roller 22 being cleaned by the cleaning device 52.

Le dispositif décrit en fig.8A, 8B, 8C présente un avantage par rapport au dispositif décrit en fig. 6. En effet, en supposant que le nettoyage puisse, par contamination par le solvant de lavage, temporairement modifier les propriétés des surfaces des rouleaux 20 et 22 (refus de l'encre), cette opération est réalisée avec les dispositifs de nettoyage 50 et 52 alors que les rouleaux de traction 20 et 22 ne sont pas en contact avec la bande.The device described in fig.8A, 8B, 8C has an advantage over the device described in Fig. 6 . Indeed, assuming that the cleaning can, by contamination with the washing solvent, temporarily modify the properties of the surfaces of the rollers 20 and 22 (ink rejection), this operation is carried out with the cleaning devices 50 and 52 then that the traction rollers 20 and 22 are not in contact with the band.

La figure 9 montre une coupe transversale d'un rouleau de traction d'un septième mode de réalisation d'un module de traction 8 selon l'invention. Ce module de traction 8 comporte un rouleau de traction 22 qui est muni d'une paroi poreuse 60 de telle sorte à définir une surface de traction poreuse. Les pores de la paroi 60 sont des cellules ouvertes, de telle sorte qu'un liquide 62 disposé à l'intérieur du rouleau 22 puisse traverser la paroi 60 et venir en contact avec la bande imprimée 12. Le liquide 62 est par exemple un mélange d'eau et de silicone.The figure 9 shows a cross section of a traction roller of a seventh embodiment of a traction module 8 according to the invention. This traction module 8 comprises a traction roller 22 which is provided with a porous wall 60 so as to define a porous traction surface. The pores of the wall 60 are open cells, so that a liquid 62 disposed inside the roller 22 can pass through the wall 60 and come into contact with the printed tape 12. The liquid 62 is for example a mixture of water and silicone.

Par ailleurs, le rouleau de traction 22 comporte en outre un joint tournant 63 comprenant une alimentation centrale 64 en liquide qui débouche à l'intérieur du rouleau de traction 22. L'alimentation 64 est disposée de manière coaxiale avec l'axe Y-Y du rouleau de traction 22.Furthermore, the traction roller 22 further comprises a rotary joint 63 comprising a central liquid feed 64 which opens into the interior of the traction roller 22. The feed 64 is arranged coaxially with the axis YY of the roller traction 22.

Sur les figures 10 et 11 est montré un huitième mode de réalisation d'un dispositif de traction 8 selon l'invention.On the figures 10 and 11 is shown an eighth embodiment of a traction device 8 according to the invention.

Ce dispositif de traction 8 comporte deux rouleaux de blanchets 70 qui s'appliquent de part et d'autre sur la bande imprimée 12 et qui sont décalés l'un de l'autre dans le sens du trajet de la bande 12.This traction device 8 comprises two blanket rollers 70 which are applied on both sides of the printed band 12 and which are offset from one another in the direction of travel of the band 12.

Le dispositif de traction 8 comporte en outre huit galets dentés 72 reliés deux par deux par un axe 73. Le dispositif de traction 8 est muni de quatre courroies ou chaînes 74 dont chacune est guidée autour de deux galets dentés 72 disposés d'un seul côté de la bande 12. Les deux courroies 74 d'un côté de la bande imprimée 12 sont reliées par des barrettes de traction 76, qui sont disposées à une distance mutuelle sur la courroie 74 qui correspond à la longueur du tronçon de bande 16. Les barrettes de traction 76 sont adaptées pour s'appliquer de part et d'autre sur la bande 12, en vis-à-vis et de serrer la bande entre elles. Ainsi elles sont adaptées pour exercer une traction sur la bande 12.The traction device 8 further comprises eight toothed rollers 72 connected in pairs by an axis 73. The traction device 8 is provided with four belts or chains 74, each of which is guided around two toothed rollers 72 arranged on one side only. The two belts 74 on one side of the printed web 12 are connected by pull bars 76, which are arranged at a mutual distance on the belt 74 which corresponds to the length of the strip section 16. The traction bars 76 are adapted to apply on both sides on the strip 12, facing each other and to tighten the strip between them. Thus they are adapted to exert traction on the band 12.

De préférence, les barrettes 76 sont entraînées en synchronisme avec la bande 12 de telle sorte qu'elles ne s'appliquent que sur la zone non imprimée de la bande 12. En outre, la surface venant en contact avec la bande 12 de la barrette 76 est de préférence en élastomère.Preferably, the bars 76 are driven in synchronism with the strip 12 so that they only apply to the unprinted area of the strip 12. In addition, the surface coming into contact with the strip 12 of the strip 76 is preferably elastomeric.

La figure 12 représente une partie d'une variante d'une machine d'impression, comportant un dispositif d'accompagnement 80 disposé entre l'unité d'impression 6 la plus en aval et le dispositif de découpe 10. En l'occurrence, le dispositif d'accompagnement 80 est disposé en amont du dispositif de traction 8. Ce dispositif d'accompagnement 80 comporte deux rouleaux de support 82 disposés d'un côté et de l'autre de la bande 12.The figure 12 represents a part of a variant of a printing machine, comprising an accompanying device 80 disposed between the printing unit 6 furthest downstream and the cutting device 10. 80 is arranged upstream of the traction device 8. This accompanying device 80 comprises two support rollers 82 arranged on one side and the other of the band 12.

Sur la figure 13, on voit une coupe transversale agrandie des rouleaux de support 82.On the figure 13 an enlarged cross-section of the support rollers 82 is seen.

Les rouleaux de support 82 sont creux et comportent une paroi cylindrique 83 à section annulaire. Là paroi 83 forme une surface extérieure de support 84. Le dispositif d'accompagnement 80 comporte des moyens de création d'un coussin à air entre la surface de support 84 et la bande imprimée 12. Ces moyens de création de coussin d'air comportent, d'une part, des ouvertures 86 traversant la paroi 83 du rouleau 82. Ces ouvertures 86 sont disposées, en section transversale, d'une manière sécante par rapport à l'axe propre A-A, B-B du rouleau 82. Par ailleurs, à l'emplacement proche de la bande 12, les ouvertures 86 ont une composante dirigée dans le sens de déplacement S de la bande 12, et ceci dans le sens radialement vers l'extérieur par rapport à l'axe propre A-A, B-B du rouleau 82 considéré. Par ailleurs, les moyens de création de coussin à air comprennent deux parois d'étanchéité 88 disposées à l'intérieur de chaque rouleau de support 82, ces parois 88 s'appliquant d'une part d'une manière étanche à l'air contre la surface interne 89 de la paroi 83, et d'autre part à l'axe central du rouleau de support 82. En outre, une entrée d'air sous pression 90 est reliée à la chambre 92 définie par les parois 83 et 88.The support rollers 82 are hollow and comprise a cylindrical wall 83 with an annular section. The wall 83 forms an outer support surface 84. The accompanying device 80 comprises means for creating an air cushion between the support surface 84 and the printed strip 12. These air cushion creation means comprise on the one hand, openings 86 passing through the wall 83 of the roller 82. These openings 86 are arranged, in cross-section, in a secant manner with respect to the own axis AA, BB of the roller 82. Moreover, the location close to the band 12, the openings 86 have a component directed in the direction of displacement S of the band 12, and this in the direction radially outwards with respect to the own axis AA, BB of the roller 82 considered. Moreover, the means for creating an airbag comprise two sealing walls 88 disposed inside each support roller 82, these walls 88 applying on the one hand in an airtight manner against the inner surface 89 of the wall 83, and secondly to the central axis of the support roller 82. In addition, a pressurized air inlet 90 is connected to the chamber 92 defined by the walls 83 and 88.

Lors du fonctionnement de ce dispositif d'accompagnement 80, les rouleaux de support 82 sont entraînés en rotation, de telle sorte que leur circonférence à l'emplacement proche de la bande imprimée se déplace dans le sens S du trajet de la bande imprimée 12. L'ouverture 86, qui se trouve à un instant donné en communication avec la chambre 92 définie par les parois 83 et 88, permet à l'air se trouvant dans la chambre 92 à s'échapper, et de créer un coussin à air entre la surface extérieure 84 et la bande imprimée 12, ce qui guide la bande imprimée 12.In operation of this accompanying device 80, the support rollers 82 are rotated so that their circumference at the location near the printed band moves in the S direction of the printed web path 12. The opening 86, which is at a given instant in communication with the chamber 92 defined by the walls 83 and 88, allows the air in the chamber 92 to escape, and create an air cushion between the outer surface 84 and the printed tape 12, which guides the printed tape 12.

Sur la figure 14 est montrée une variante du dispositif d'accompagnement 80, qui diffère du dispositif de la figure 13 par ce qui suit. Les éléments analogues portent les mêmes références.On the figure 14 is shown a variant of the accompanying device 80, which differs from the device of the figure 13 by what follows. Similar elements bear the same references.

Ce dispositif d'accompagnement 80 comporte une seule paroi d'étanchéité 88 par rouleau 82 qui s'étend autour du rouleau de support 82 sur pratiquement toute sa circonférence, à l'exception d'une partie dirigée vers la bande imprimée 12. Aucune paroi d'étanchéité ne s'étend à l'intérieur du rouleau 82. Ce mode de réalisation est facile à fabriquer.This accompanying device 80 has a single sealing wall 88 per roll 82 which extends around the support roll 82 over substantially its entire circumference, with the exception of a portion facing the printed web 12. No wall The seal extends within the roller 82. This embodiment is easy to manufacture.

En variante non représentée, au moins l'un des rouleaux de traction 20, 22 comporte des ouvertures dans sa surface enveloppante, et le dispositif de traction 8 est muni d'un dispositif à vide adapté pour créer un vide dans ces ouvertures. Ceci aide à guider la bande 12.In variant not shown, at least one of the traction rollers 20, 22 has openings in its surrounding surface, and the traction device 8 is provided with a vacuum device adapted to create a vacuum in these openings. This helps guide the band 12.

D'une manière générale, les éléments de traction comportent des surfaces de traction qui ne viennent en contact qu'avec la zone non imprimée de la bande 12. A cet effet, les éléments de traction peuvent comprendre un rouleau de traction qui s'applique sur une zone latérale non imprimée de la bande.In general, the traction elements comprise traction surfaces which come into contact only with the unprinted zone of the strip 12. For this purpose, the traction elements may comprise a traction roller which applies on an unprinted side area of the strip.

Claims (22)

  1. Rotary printing press of the type comprising:
    - a continuous printing web (12) of material to be printed,
    - at least one printing unit (6) adapted for printing on the printing web (12),
    - a cutting device (10) adapted for cutting the web (12) which is printed by the printing unit (6),
    - a traction device (8) which is located downstream of the printing unit (6) furthest downstream and upstream of the cutting device (10), the traction device (8) being adapted for applying a predetermined mechanical tension to the printed web (12) which is discharged from the printing unit (6) furthest downstream, the traction device (8) comprising two traction elements (20, 22; 76), each having a traction surface which is adapted for coming into contact with a face of the printed web (12) so as to apply the predetermined mechanical traction to the printed web (12), the two traction elements being traction rollers (20, 22), characterised in that the printing web (12) is a coated paper web, in that at least one of the traction rollers (20, 22) comprises openings in the outer surface thereof, in that the traction device (8) is equipped with a pressure reduction device which is adapted for producing a reduced pressure in those openings, and in that the traction device is equipped with a device (30, 32) for cleaning the traction surface of at least one of the traction rollers (20, 22).
  2. Printing press according to claim 1, characterised in that the press is adapted for conveying the printed web (12) so as to be freely suspended and in ambient air over the entire travel between the printing unit (6) furthest downstream and the traction device (8).
  3. Printing press according to claim 1 or claim 2, characterised in that the press is adapted for conveying the printed web (12) in ambient air over the entire travel between the traction device (8) and the cutting device (10).
  4. Printing press according to any one of claims 1 to 3, characterised in that the press comprises a device (14) for drying the printed web (12), in particular an infrared radiation drying device, which is arranged downstream of the traction device (8) and upstream of the cutting device (10).
  5. Printing press according to any one of the preceding claims, characterised in that the press comprises means (60, 63, 64) for providing a liquid (62) which repels ink at least at one traction surface.
  6. Printing press according to any one of the preceding claims, characterised in that the two traction elements (20, 22; 76) comprise traction surfaces which repel ink.
  7. Printing press according to any one of the preceding claims, characterised in that the two traction rollers (20, 22) are arranged with spacing from each other, defining a substantially S-like travel for the printed web (12).
  8. Printing press according to any one of the preceding claims, characterised in that the two traction rollers (20, 22) are provided one behind the other over the travel of the printed web (12), and in that the traction device comprises two clamping rollers (54, 56), each of which is provided facing one of the traction rollers (20, 22), the clamping rollers (54, 56) having a diameter which is different from the diameter of the traction rollers (20, 22), and in that a clamping roller (54, 56) and a traction roller (20, 22) being adapted for clamping the printed web (12) therebetween, respectively.
  9. Printing press according to any one of claim 1 to6, characterised in that the two traction rollers are provided facing each other.
  10. Printing press according to any one of the preceding claims, characterised in that each of the two traction elements (20, 22) is adapted for moving into contact with one of the two opposing faces of the printed web (12).
  11. Printing press according to any one of the preceding claims, characterised in that the cleaning device (30, 32) comprises a cleaning bar (34, 36) in contact with the traction surface.
  12. Printing press according to any one of the preceding claims, characterised in that the cleaning device (30, 32) comprises a first cleaning roller (38, 40), the surface of which is adapted for moving into rolling contact with a traction roller (20, 22), in that the surface of the first cleaning roller (38, 40) attracts ink, and in that the cleaning device comprises means (42, 44) for removing the ink from the surface of the cleaning roller (38, 40).
  13. Printing press according to claim 12, characterised in that the cleaning roller (38, 40) is movable between a cleaning position, in which it is in contact with the associated traction roller (20, 22) and a washing position (50, 52), in which it is in contact with a device for washing the cleaning roller.
  14. Printing press according to claim 12 or claim 13, characterised in that the cleaning device comprises a second cleaning roller (38, 40) which is adapted for moving into contact with the same traction roller (20, 22) as the first cleaning roller (38, 40), and in that those two cleaning rollers (38, 40) are adapted for alternately moving into contact with the traction roller (20, 22).
  15. Printing press according to claims 7, characterised in that the traction rollers (20, 22) and the clamping rollers (51, 52) are movable between a traction position of the printed web (12) and a cleaning position, and in that the press is adapted for moving a pair comprising a traction roller (20, 22) and a clamping roller (54, 56) into the cleaning position while the other pair of a traction roller (20, 22) and a clamping roller (54, 56) is in the traction position.
  16. Printing press according to any one of claims 1 to 4, characterised in that the traction elements comprise traction bars (76) which extend across the printed web.
  17. Printing press according to any one of the preceding claims, characterised in that the press further comprises an auxiliary device (80) which is provided between the printing unit (6) furthest downstream and the cutting device (10), in that the auxiliary device (80) comprises at least one support roller (82) provided with a support surface (84) for the printed web (12), and in that the auxiliary device (80) comprises means for producing a cushion of air between the support surface (84) and the printed web (12).
  18. Printing press according to any one of claims 1 to 17, characterised in that the printing unit (6) comprises a reservoir (7) of ink which contains ink (7A) and which is adapted for printing on the printing web.
  19. Printing press according to claim 18, characterised in that the ink (7A) is waterless ink.
  20. Printing press according to claim 19, characterised in that the ink (7A) is desiccative ink or bi-component ink.
  21. Printing press according to any one of claims 1 to 20, characterised in that the coated paper of the printing web (12) is coated paper having a coating of kaolin or chalk.
  22. Printing method using a press according to any one of the preceding claims, comprising the following steps:
    a) printing on a printing web, forming a printed web,
    b) cutting the printed web into printed sheets, characterised by the following steps:
    c) producing a predetermined mechanical tension in the printed web before the cutting operation by means of a printing press according to any one of the preceding claims, and in that
    d) the printing web (12) is a coated paper web, in particular comprising a coating of kaolin or chalk.
EP07870236.2A 2006-11-24 2007-10-31 Printing machine and corresponding method Not-in-force EP2091735B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0610318A FR2909031B1 (en) 2006-11-24 2006-11-24 PRINTING MACHINE AND CORRESPONDING METHOD.
PCT/FR2007/001813 WO2008068399A2 (en) 2006-11-24 2007-10-31 Printing machine and corresponding method

Publications (2)

Publication Number Publication Date
EP2091735A2 EP2091735A2 (en) 2009-08-26
EP2091735B1 true EP2091735B1 (en) 2014-03-19

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EP07870236.2A Not-in-force EP2091735B1 (en) 2006-11-24 2007-10-31 Printing machine and corresponding method

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US (1) US20100064917A1 (en)
EP (1) EP2091735B1 (en)
JP (1) JP2010510107A (en)
CN (1) CN101573236B (en)
FR (1) FR2909031B1 (en)
WO (1) WO2008068399A2 (en)

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Also Published As

Publication number Publication date
WO2008068399A3 (en) 2008-11-27
WO2008068399A2 (en) 2008-06-12
JP2010510107A (en) 2010-04-02
US20100064917A1 (en) 2010-03-18
CN101573236A (en) 2009-11-04
FR2909031A1 (en) 2008-05-30
EP2091735A2 (en) 2009-08-26
FR2909031B1 (en) 2011-03-04
CN101573236B (en) 2012-09-26

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