EP2457730B1 - Printing assembly and corresponding use - Google Patents

Printing assembly and corresponding use Download PDF

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Publication number
EP2457730B1
EP2457730B1 EP11306101.4A EP11306101A EP2457730B1 EP 2457730 B1 EP2457730 B1 EP 2457730B1 EP 11306101 A EP11306101 A EP 11306101A EP 2457730 B1 EP2457730 B1 EP 2457730B1
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EP
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Prior art keywords
compensation
print
path
width
upstream
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German (de)
French (fr)
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EP2457730A1 (en
Inventor
Patrick Lepeltier
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Goss International Montataire SA
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Goss International Montataire SA
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    • 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
    • B41F13/025—Registering devices

Definitions

  • Offset printing presses having two printing units which print one after the other on a paper web, each printing unit printing with a different color.
  • An example of a printing press similar to that defined in the preamble of claim 1, is described in WO 99/65682 and in EP 1 101 721 A1 .
  • the upstream printing unit delivers the paper uniformly over its width, while the downstream printing unit delivers more paper at the lateral edges than at the center.
  • the paper web is tighter on the side edges and the dots to be printed by the downstream print unit are printed in advance of the center of the web.
  • This printing defect is indicated on the Figure 11 .
  • the image to be printed by each printing unit is a straight line extending across the width of the strip.
  • the printed color C1 is that of the upstream printing unit and is rectilinear.
  • the printed color C2 is that of the downstream printing unit and it can be seen that the image is deformed with the lateral portions forward.
  • the upstream print unit delivers more paper at the edges, while the downstream print unit delivers uniformly.
  • the points to be printed by the downstream printing unit are printed late on the edges with respect to the center of the strip.
  • the upstream printing unit delivers uniformly and the downstream printing unit debit less on the edges.
  • This last case is represented on the Figure 12 .
  • the image printed by the upstream printing unit is rectilinear while the image printed by the downstream printing unit is late on the side edges.
  • the Figure 13 shows another type of defect, in the case where a first part of a blanket situated at a distance from the edge and of the median line delivers more and a second part of a blanket situated at a distance from the edge and the center line delivers less than the directly adjacent parts of those parts.
  • the printing defect is therefore a defect in the form of "zigzag".
  • the object of the invention is to propose a printing press which has an improved print quality and which makes it possible to reduce or even eliminate the "chevron" effect described above with respect to known presses, and this of preference with simple and economical means.
  • the invention relates to a printing assembly according to claim 1.
  • the subject of the invention is also a use of an assembly as defined above, in order to correct an increasing longitudinal shift from a central part of the band to be printed to the two edges of the two-image printing band. printed successively by the upstream and downstream printing unit.
  • the figure 1 shows a top view of a printing press according to the invention, designated by the general reference 2.
  • the printing press 2 is an offset printing press.
  • the printing press 2 comprises a printing unit 4 which is provided with an upstream printing unit 6 and a downstream printing unit 8.
  • Each of the printing units 6, 8 comprises two printing units provided with a plate cylinder 10 and a blanket cylinder 12.
  • one of the plate cylinders per printing unit can be omitted and the Blanket cylinder 12 of this printing unit therefore functions as a backpressure cylinder.
  • Each plate cylinder 10 has an axis of rotation ACP and each blanket cylinder 12 has an axis of rotation ACB.
  • the upstream printing unit 6 and the downstream printing unit 8 are adapted to successively print one after the other on a print tape 14 over a printing width LI.
  • the print width LI is divided into two half printing widths LD. Each half-width of printing is limited by one of two lateral edges BB (see below).
  • Each printing unit 6, 8 defines a printing gap 16 through which the printing web 14 passes.
  • Each printing gap 16 is defined by the two blanket cylinders 12.
  • the two printing interstices 12 define a P-P gap plane passing through the two interstices.
  • the two printing units 6, 8 also define a median line M-M which extends in a median plane of the two units and in the interplanar plane P-P.
  • the print tape 14 has a width LB which is slightly larger than the printing width LI.
  • the print assembly 4 defines a path of the print tape 14 extending from the upstream printing unit 6 to the downstream printing unit 8 along a path direction T.
  • the print tape 14 has a central portion 18, a plurality of partial strips 20 and is delimited by two lateral edges BB.
  • the partial strips 20 extend laterally to the central portion 18.
  • the central portion 18 is for example a portion extending between two printed images, but may have a lateral dimension of "0".
  • central portion 18 and the partial strips 20 are parts of the same print band 14, the print band 14 being continuous over its entire width. Partial bands are therefore "virtual" bands.
  • 4 for the print tape 14 defines a plurality of paths extending between the print units 6, 8. Each path is the path traveled by an imaginary point on the print tape 14 between the two print units. printing 6, 8.
  • the printing press comprises compensation means 30 defining compensation paths of the band to be printed, for example TCO1, TCO2, TCO3, TCO4, between the two upstream and downstream printing units 6.
  • the central portion 18 defines a central TCE path that is shown at the figure 2 .
  • the compensation paths are longer than the central path TCE of the central portion 18 of the band.
  • the central path is a free-hanging path of the central portion 18 of the band to be printed between the two upstream printing units 6 and 8 downstream.
  • the central path is therefore a neutral path and the portion 18 is a neutral portion.
  • the free suspension path coincides with the interstice plane PP.
  • the neutral path may be at different locations from the central path.
  • the compensation means 30 comprise a deflection element 32 adapted to come into contact with the band to be printed in order to deflect the desired parts of this band.
  • the deflection element 32 defines the compensation paths TCO1, TCO2, TCO3, TCO4.
  • the compensation paths TCO1, TCO2 are associated with a first of the half printing widths LD and the compensation paths TCO3, TCO4 are associated one second with the half printing widths LD.
  • the deflection element 32 is an assembly of several deflection members 36. Each deflection member 36 extends over a portion of the width of the print tape 14 or print width. Each deflection member 36 is adapted to deflect the associated partial band 20 of the print tape to define one or more of the compensation paths. In this case, each of the deflection members 36 extends over a width substantially the same as the width of an image to be printed, a page to be printed or a printing plate.
  • each of the deflection members 36 is a deflection bar.
  • the deflection element 32 comprises four deflection members.
  • Each deflection member 36 is a separate part from the other deflection members.
  • Each deflection member 36 is movable in translation perpendicularly with respect to the interstice plane PP, and this independently of all the other deflection members 36.
  • each deflection member 36 is movable in translation along a direction having a perpendicular component in the plane PP, and this independently of all the other deflection members 36.
  • each deflection member 36 is movable in inclination with respect to the interplanar plane P-P and in particular rotatable about an inclination axis AI (cf.
  • the compensation means 30 comprise, for each deflection member 36, two support members 40. Each end of each deflection member 36 is attached to one of the two support members 40 Each element 40 is displaceable perpendicular to the gap plane PP independently of all the other support elements 40. The connection between the support element 40 and the associated end is obtained by an articulated joint whose axis is perpendicular to the median line MM.
  • the compensation means 30 also comprise, for each deflection member 36, two actuators 42 adapted to move one or both of the support members 40 as a function of a control signal. There are two supports 40 per deflection member 36, thus two actuators 42 per deflection member 36.
  • the assembly 4 also comprises a control device 50.
  • the control device 50 comprises, for each partial band 20 or compensation path TCO1 to TCO4, a sensor 54 adapted to determine the longitudinal difference between an image printed by the unit. 4 and the image printed by the downstream printing unit 6 on the partial band or the associated compensation path.
  • the longitudinal differences are read for all the colors downstream of the printing unit furthest downstream.
  • a sensor 54 is arranged in partial strip 20 on each side of the strip and the measurement is made on the front and back of each partial strip and an average is calculated of the two deviation values determined for each partial strip 20.
  • the control device 50 also comprises an evaluation and control unit which is adapted to send a control signal to the actuators 42 associated with the partial band 20 or to the compensation path and to move the deflection member 36 of such so that the longitudinal gap is decreased.
  • Each of the deflection members 36 also comprises, on the one hand, air outlet holes adapted to create an air cushion between the printing tape 14 and the deflection member 36, and on the other hand a feed device 60 adapted to supply air only the air outlet holes of the deflection members 36 defining a compensation path, but not the air outlet holes of each deflection member not defining a compensation path.
  • the supply device 60 is adapted to supply air only to the air outlet holes of the deflection members which, in the absence of the air bag, would be in contact with the band to be printed.
  • the supply device 60 is for this purpose connected to the control device 50 and the air supply of the deflection member 36 is switched on or off by the device 50 as a function of the position and / or the inclination of deflection members 36.
  • the figures 5 and 6 show in an exemplary manner the position of the deflecting members during a correction of a printing defect corresponding to the Figure 11 .
  • the deflection members 36 associated with the correction path TCO2 and TCO3 are inclined with respect to the interstice plane PP, but that their ends associated with the central path TCE or neutral path are in a position in which the central path follows the neutral path. and is not offset from the gap plane PP.
  • the members 36 associated with the correction path TCO1 and TCO4 are inclined with respect to the gap plane PP and are shifted towards the band to be printed 14 so that the band 14 to be printed is offset from the gap plane PP.
  • the compensation means 30 are in a correction configuration of a defect of the type indicated on the Figure 12 .
  • the deflection members 36 are configured such that the compensation paths TCO2 and TCO3 adjacent to the central path TCE are longer than the compensation paths TCO1 and TCO4 adjacent the edges BB of the band. Also, in this case, the central path TCE and longer than the compensation paths TCO1 to TCO4.
  • the deflection members take positions in which a printing defect as indicated on the Figure 13 is corrected.
  • the deflection members 36 define three adjacent compensation paths for a first half-width of printing and the compensation path of the middle of these compensation paths is longer than the other two of these three. compensation paths.
  • the deflection members 36 define three further compensation paths on a second half printing width and the middle compensation path of these other compensation paths is longer than the other two of these other three compensating paths.
  • the compensating paths on the first half-width of printing are offset from a plane parallel to, or coincident with, the gap plane (P1-P1) in a first direction and compensation on the second half-width of printing are offset from this plane in a second direction opposite the first direction.
  • the compensation paths on the first half-width of printing are offset by a plane parallel to the plane of gap (P1-P1), or coinciding with this plane, in a first direction and the paths of compensation on the second half-width of printing are offset from this plane in the same direction.
  • each deflection member 36 are deflection rollers.
  • each deflection member is constituted by a deflection roll.
  • Each deflection roll is rotatable about an axis of rotation passing through the articulated joints of the support members 40.
  • each deflection member 36 is a deflection pad.
  • the compensation means 30 comprise, for at least one deflection member 36, and preferably for each deflection member, a counter-member 37 for deflection.
  • Each counter-deflection member 37 is disposed on the side of the strip 14 opposite to the deflection member 36, preferably laterally at the same position as the associated deflection member.
  • the deflection members 36 are arranged at a sufficient distance upstream of the downstream printing unit so as not to influence the lateral register.
  • the distance between the printing gap 16 of the upstream printing unit and the deflection members is between 0% and 50% of the distance between the printing interstices 16.
  • the distance between the printing gap 16 of the upstream printing unit and the deflection members is between 25% and 50% of the distance between the printing interstices 16.
  • the distance between the organs deflection 36 and the printing gap 16 of the upstream or downstream printing unit is between 30cm and 50cm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Printing Methods (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

The assembly (2) has an upstream print unit (4) and a downstream print unit (6) arranged to print a strip (14) over print width. The upstream and downstream print units define print interstices that define an interstice plane. The upstream and downstream print units define a middle line (M-M). A compensation unit (30) comprises two separate bypass units (36) i.e. deviation bodies, each defining a compensation path (TCO1) between the upstream and downstream units. The compensation path is longer than a neutral path of a neutral portion (18) of the strip to be printed.

Description

La présente invention concerne un ensemble d'impression du type comprenant

  • une unité d'impression amont et une unité d'impression aval adaptées pour imprimer l'une après l'autre une bande à imprimer sur une largeur d'impression,
  • chaque unité d'impression amont et aval définissant un interstice d'impression et les deux interstices d'impression définissant un plan d'interstice,
les deux unités d'impression amont et aval définissant une ligne médiane.The present invention relates to a printing assembly of the type comprising
  • an upstream printing unit and a downstream printing unit adapted to print one after another a band to be printed on a printing width,
  • each upstream and downstream printing unit defining a printing gap and the two printing interstices defining a gap plane,
the two upstream and downstream printing units defining a center line.

On connaît des presses d'impression offset comportant deux unités d'impression qui impriment l'une après l'autre sur une bande de papier, chaque unité d'impression imprimant avec une couleur différente. Un exemple de presse d'impression, similaire à celle définie dans le préambule de la revendication 1, est décrit dans WO 99/65682 et dans EP 1 101 721 A1 .Offset printing presses are known having two printing units which print one after the other on a paper web, each printing unit printing with a different color. An example of a printing press, similar to that defined in the preamble of claim 1, is described in WO 99/65682 and in EP 1 101 721 A1 .

Ces presses d'impression créent un défaut d'impression connu sous le nom de « chevron » qui consiste à ne pas superposer exactement toutes les couleurs devant produire un même point coloré dans le sens de défilement du papier à la fois au centre de la bande et aux extrémités.These printing presses create a printing defect known as "chevron" which consists of not exactly superimposing all the colors to produce the same colored dot in the direction of paper scrolling both in the center of the strip and at the ends.

En effet, l'unité d'impression amont débite le papier de façon uniforme sur sa largeur, tandis que l'unité d'impression aval débite plus de papier au niveau des bords latéraux qu'au centre. En conséquence, la bande de papier est plus tendue sur les bords latéraux et les points à imprimer par l'unité d'impression aval sont imprimés en avance par rapport au centre de la bande. Ce défaut d'impression est indiqué sur la Figure 11. L'image à imprimer par chaque unité d'impression est une ligne droite s'étendant à travers la largeur de la bande. La couleur imprimée C1 est celle de l'unité d'impression amont et est rectiligne. La couleur imprimée C2 est celle de l'unité d'impression aval et on voit que l'image est déformée avec les portions latérales en avant.In fact, the upstream printing unit delivers the paper uniformly over its width, while the downstream printing unit delivers more paper at the lateral edges than at the center. As a result, the paper web is tighter on the side edges and the dots to be printed by the downstream print unit are printed in advance of the center of the web. This printing defect is indicated on the Figure 11 . The image to be printed by each printing unit is a straight line extending across the width of the strip. The printed color C1 is that of the upstream printing unit and is rectilinear. The printed color C2 is that of the downstream printing unit and it can be seen that the image is deformed with the lateral portions forward.

Dans d'autres circonstances, l'unité d'impression amont débite plus de papier au niveau des bords, tandis que l'unité d'impression aval débite de façon uniforme. Dans ce cas les points à imprimer par l'unité d'impression aval sont imprimés en retard sur les bords par rapport au centre de la bande. De même si l'unité d'impression amont débite de façon uniforme et que l'unité d'impression aval débite moins sur les bords. Ce dernier cas est représenté sur la Figure 12. L'image imprimée par l'unité d'impression amont est rectiligne tandis que l'image imprimée par l'unité d'impression aval est en retard sur les bords latéraux. La Figure 13 montre un autre type de défaut, dans le cas où une première partie d'un blanchet située à distance du bord et de la ligne médiane débite plus et une deuxième partie d'un blanchet située à distance du bord et de la ligne médiane débite moins que les parties directement adjacentes de ces parties. Le défaut d'impression est donc un défaut en forme de « zigzag ».In other circumstances, the upstream print unit delivers more paper at the edges, while the downstream print unit delivers uniformly. In this case, the points to be printed by the downstream printing unit are printed late on the edges with respect to the center of the strip. Likewise, if the upstream printing unit delivers uniformly and the downstream printing unit debit less on the edges. This last case is represented on the Figure 12 . The image printed by the upstream printing unit is rectilinear while the image printed by the downstream printing unit is late on the side edges. The Figure 13 shows another type of defect, in the case where a first part of a blanket situated at a distance from the edge and of the median line delivers more and a second part of a blanket situated at a distance from the edge and the center line delivers less than the directly adjacent parts of those parts. The printing defect is therefore a defect in the form of "zigzag".

L'invention a pour but de proposer une presse d'impression qui ait une qualité d'impression améliorée et qui permette de diminuer, voire supprimer l'effet de « chevron » décrit ci-dessus par rapport aux presses connues, et ceci de préférences avec de moyens simples et économiques.The object of the invention is to propose a printing press which has an improved print quality and which makes it possible to reduce or even eliminate the "chevron" effect described above with respect to known presses, and this of preference with simple and economical means.

A cet effet l'invention a pour objet un ensemble d'impression selon la revendication 1.For this purpose the invention relates to a printing assembly according to claim 1.

Selon des modes particuliers de réalisation, l'ensemble d'impression selon l'invention comporte l'une ou plusieurs des caractéristiques suivantes :

  • le trajet neutre est un trajet en libre suspension de la bande à imprimer entre les deux unités d'impression amont et aval ;
  • la largeur d'impression est constituée de deux demi-largeurs d'impression ;
  • au moins deux trajets de compensation définis par les organes de déviation se trouvent sur une même première demi-largeur d'impression ; et
  • [a] soit pour à chaque fois deux de ces trajets de compensation sur cette première demi-largeur d'impression, le trajet de compensation plus près de la portion neutre est moins long que le trajet de compensation plus éloigné de la portion neutre ;
  • [b] soit pour à chaque fois deux de ces trajets de compensation sur cette première demi-largeur d'impression, le trajet de compensation plus près de la portion neutre est plus long que le trajet de compensation plus éloigné de la portion neutre ;
  • [c] soit trois trajets de compensation se trouvent sur la première demi-largeur d'impression et le trajet de compensation du milieu est plus long que les deux autres de ces trois trajets de compensation ;
  • au moins deux trajets de compensation définis par les organes de déviation se trouvent sur une même seconde demi-largeur d'impression ; et
  • [a] soit pour à chaque fois deux de ces trajets de compensation sur cette seconde demi-largeur d'impression, le trajet de compensation plus près de la portion neutre est moins long que le trajet de compensation plus éloigné de la portion neutre ;
  • [b] soit pour à chaque fois deux de ces trajets de compensation sur cette seconde demi-largeur d'impression, le trajet de compensation plus près de la portion neutre est plus long que le trajet de compensation plus éloigné de la portion neutre ;
  • [c] soit trois trajets de compensation se trouvent sur la deuxième demi-largeur d'impression et le trajet de compensation du milieu de ces trajets de compensation est plus long que les deux autres de ces trois trajets de compensation ;
et dans lequel en particulier les trajets de compensation se trouvant sur la première demi-largeur d'impression étant décalés d'un plan parallèle au plan d'interstice dans un premier sens et les trajets de compensation se trouvant sur la deuxième demi-largeur d'impression étant décalés de ce plan parallèle au plan d'interstice dans un deuxième sens ;
  • le trajet neutre est un trajet d'une portion centrale de la bande à imprimer ;
  • le trajet neutre est un trajet d'une portion latérale de la bande à imprimer qui est décalée latéralement d'une portion centrale ;
  • chaque organe de déviation est mobile en translation avec une composante perpendiculaire par rapport au plan d'interstice, de préférence est mobile indépendamment de chaque autre organe de déviation ;
  • chaque organe de déviation est mobile en inclinaison par rapport au plan d'interstice, notamment mobile en rotation autour d'un axe d'inclinaison s'étendant parallèlement au plan d'interstice et à la ligne médiane ;
  • chaque organe de déviation s'étend sur une partie de la largeur d'impression et est une barre de déviation, un rouleau de déviation ou un patin de déviation ;
  • au moins deux organes de déviation comportent des trous de sortie d'air adaptés pour créer un coussin d'air entre la bande à imprimer et l'organe de déviation associé et dans lequel l'ensemble comporte un dispositif d'alimentation adapté pour alimenter en air uniquement les trous de sortie d'air des organes de déviation définissant un trajet de compensation, mais non pas les trous de sortie d'air de chaque organe de déviation ne pas définissant un trajet de compensation ;
  • les moyens de compensation comprennent au moins un contre-organe de déviation disposé du côté de la bande opposée à l'organe de déviation, de préférence latéralement à la même position que l'organe de déviation associé ;
  • un dispositif de contrôle adapté pour déterminer l'écart longitudinal entre les images imprimées par l'unité d'impression amont et l'unité d'impression aval et d'agir sur les moyens de compensation de telle sorte que cet écart soit diminué ou complètement compensé.
According to particular embodiments, the printing assembly according to the invention comprises one or more of the following characteristics:
  • the neutral path is a free-hanging path of the band to be printed between the two upstream and downstream printing units;
  • the printing width consists of two half-widths of printing;
  • at least two compensation paths defined by the deflection members are on the same first half-width of printing; and
  • [a] either for each of two of these compensation paths on this first half-print width, the compensation path closer to the neutral portion is shorter than the compensation path further from the neutral portion;
  • [b] for each of two of these compensating paths on that first half-print width, the compensation path closer to the neutral portion is longer than the compensation path further away from the neutral portion;
  • [c] three compensation paths are on the first half print width and the middle compensation path is longer than the other two of these three compensation paths;
  • at least two compensation paths defined by the deflection members are on the same second half-width of printing; and
  • [a] either for each of two of these compensation paths on this second half-print width, the compensation path closer to the neutral portion is shorter than the compensation path further from the neutral portion;
  • [b] either for each of two of these compensation paths on this second half-print width, the compensation path closer to the neutral portion is longer than the compensation path further away from the neutral portion;
  • [c] three compensation paths are on the second half print width and the middle compensation path of these compensation paths is longer than the other two of these three compensation paths;
and wherein in particular the compensation paths on the first print half-width are offset from a plane parallel to the gap plane in a first direction and the compensation paths are on the second half-width printing being offset from this plane parallel to the gap plane in a second direction;
  • the neutral path is a path of a central portion of the tape to be printed;
  • the neutral path is a path of a lateral portion of the print tape which is offset laterally from a central portion;
  • each deflection member is movable in translation with a component perpendicular to the interstitial plane, preferably is movable independently of each other deflection member;
  • each deflection member is movable in inclination with respect to the interstice plane, in particular rotatable about an inclination axis extending parallel to the interstice plane and the center line;
  • each deflection member extends over a portion of the printing width and is a deflection bar, a deflection roller or a deflection pad;
  • at least two deflection members have air outlet holes adapted to create an air cushion between the print tape and the associated deflection member and wherein the assembly comprises a feed device adapted to feed air only the air outlet holes of the deflection members defining a compensation path, but not the air outlet holes of each deflection member not defining a compensation path;
  • the compensation means comprise at least one deflection counter-member disposed on the side of the strip opposite to the deflection member, preferably laterally at the same position as the associated deflection member;
  • a control device adapted to determine the longitudinal gap between the images printed by the upstream printing unit and the downstream printing unit and to act on the compensation means so that this difference is decreased or completely compensated.

L'invention a également pour objet une utilisation d'un ensemble tel que défini ci-dessus, afin de corriger un décalage longitudinal croissant allant d'une partie centrale de la bande à imprimer vers les deux bords de la bande à imprimer de deux images imprimées successivement par l'unité d'impression amont et aval.The subject of the invention is also a use of an assembly as defined above, in order to correct an increasing longitudinal shift from a central part of the band to be printed to the two edges of the two-image printing band. printed successively by the upstream and downstream printing unit.

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 dessus d'une presse d'impression selon un premier mode de réalisation de l'invention ;
  • la figure 2 est une vue schématique en coupe de la presse d'impression le long de la ligne II-II de la figure 1 ;
  • la figure 3 est une vue schématique en coupe de la presse d'impression selon la ligne III-III de la figure 1 ;
  • la figure 4 est une vue en perspective schématique d'une partie de la presse d'impression de la figure 1 dans une configuration hors compensation ;
  • la figure 5 est une vue analogue à la vue de la figure 4, la presse d'impression étant dans une première configuration de compensation ;
  • la figure 6 est une vue de face du dispositif de compensation de la presse dans la première configuration de compensation ;
  • la figure 7 est une vue analogue à la vue de la figure 4, la presse d'impression étant dans une deuxième configuration de compensation ;
  • la figure 8 est une vue de face du dispositif de compensation de la presse dans la deuxième configuration de compensation ;
  • la figure 9 est une vue d'un deuxième mode de réalisation de la presse d'impression selon l'invention, la vue étant analogue à celle de la figure 5 ;
  • la figure 10 est une vue de face du deuxième mode de réalisation de la presse d'impression selon l'invention ;
  • la Figure 11 est une vue d'un premier défaut d'impression corrigé par le dispositif de compensation selon l'invention ;
  • la Figure 12 est une vue d'un deuxième défaut d'impression corrigé par le dispositif de compensation selon l'invention ; et
  • la Figure 13 est une vue d'un troisième défaut d'impression corrigé par le dispositif de compensation selon l'invention.
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 top view of a printing press according to a first embodiment of the invention;
  • the figure 2 is a schematic sectional view of the printing press along line II-II of the figure 1 ;
  • the figure 3 is a schematic sectional view of the printing press according to the line III-III of the figure 1 ;
  • the figure 4 is a schematic perspective view of part of the printing press of the figure 1 in an off-compensation configuration;
  • the figure 5 is a view similar to the view of the figure 4 the printing press being in a first compensation configuration;
  • the figure 6 is a front view of the press compensation device in the first compensation configuration;
  • the figure 7 is a view similar to the view of the figure 4 , the printing press being in a second compensation configuration;
  • the figure 8 is a front view of the press compensation device in the second compensation configuration;
  • the figure 9 is a view of a second embodiment of the printing press according to the invention, the view being similar to that of the figure 5 ;
  • the figure 10 is a front view of the second embodiment of the printing press according to the invention;
  • the Figure 11 is a view of a first printing defect corrected by the compensation device according to the invention;
  • the Figure 12 is a view of a second printing defect corrected by the compensation device according to the invention; and
  • the Figure 13 is a view of a third printing defect corrected by the compensation device according to the invention.

La figure 1 montre en vue de dessus une presse d'impression selon l'invention, désignée par la référence générale 2.The figure 1 shows a top view of a printing press according to the invention, designated by the general reference 2.

La presse d'impression 2 est une presse d'impression offset.The printing press 2 is an offset printing press.

La presse d'impression 2 comprend un ensemble d'impression 4 qui est muni d'une unité d'impression amont 6 et d'une unité d'impression aval 8.The printing press 2 comprises a printing unit 4 which is provided with an upstream printing unit 6 and a downstream printing unit 8.

Chacune des unités d'impression 6, 8 comprend deux groupes d'impression munis d'un cylindre de plaque 10 et d'un cylindre de blanchet 12. En variante, un des cylindres de plaque par unité d'impression peut être omis et le cylindre de blanchet 12 de ce groupe d'impression fonctionne donc en tant que cylindre de contre-pression.Each of the printing units 6, 8 comprises two printing units provided with a plate cylinder 10 and a blanket cylinder 12. Alternatively, one of the plate cylinders per printing unit can be omitted and the Blanket cylinder 12 of this printing unit therefore functions as a backpressure cylinder.

Chaque cylindre de plaque 10 a un axe de rotation ACP et chaque cylindre de blanchet 12 a un axe de rotation ACB.Each plate cylinder 10 has an axis of rotation ACP and each blanket cylinder 12 has an axis of rotation ACB.

L'unité d'impression amont 6 et l'unité d'impression aval 8 sont adaptées pour imprimer successivement l'une après l'autre sur une bande à imprimer 14 sur une largeur d'impression LI. La largeur d'impression LI est divisée en deux demi-largeurs d'impression LD. Chaque demi-largeur d'impression est limitée par l'un de deux bords latéraux BB (voir ci-après).The upstream printing unit 6 and the downstream printing unit 8 are adapted to successively print one after the other on a print tape 14 over a printing width LI. The print width LI is divided into two half printing widths LD. Each half-width of printing is limited by one of two lateral edges BB (see below).

Chaque unité d'impression 6, 8 définit un interstice d'impression 16 à travers lequel passe la bande à imprimer 14. Chaque interstice d'impression 16 est défini par les deux cylindres de blanchet 12.Each printing unit 6, 8 defines a printing gap 16 through which the printing web 14 passes. Each printing gap 16 is defined by the two blanket cylinders 12.

Les deux interstices d'impression 12 définissent un plan d'interstice P-P passant par les deux interstices.The two printing interstices 12 define a P-P gap plane passing through the two interstices.

Dans la réalité, la bande à imprimer 14 est enroulée légèrement sur le blanchet inférieur en sortie de l'unité d'impression à cause de l'adhérence de l'encre. Pour les besoins de la présente description cet effet est négligé. Les deux unités d'impression 6, 8 définissent également une ligne médiane M-M qui s'étend dans un plan médian des deux unités et dans le plan d'interstice P-P.In reality, the print tape 14 is wound slightly on the lower blanket at the output of the printing unit because of the adhesion of the ink. For the purposes of this description this effect is neglected. The two printing units 6, 8 also define a median line M-M which extends in a median plane of the two units and in the interplanar plane P-P.

La bande à imprimer 14 a une largeur LB qui est légèrement supérieure à la largeur d'impression LI. L'ensemble d'impression 4 définit un trajet de la bande à imprimer 14 s'étendant de l'unité d'impression amont 6 vers l'unité d'impression aval 8 selon un sens de trajet T.The print tape 14 has a width LB which is slightly larger than the printing width LI. The print assembly 4 defines a path of the print tape 14 extending from the upstream printing unit 6 to the downstream printing unit 8 along a path direction T.

La bande à imprimer 14 comporte une portion centrale 18, une pluralité de bandes partielles 20 et est délimitée par deux bord latéraux BB. Les bandes partielles 20 s'étendent latéralement à la portion centrale 18. La portion centrale 18 est par exemple une portion s'étendant entre deux images imprimées, mais peut avoir une dimension latérale de « 0 ».The print tape 14 has a central portion 18, a plurality of partial strips 20 and is delimited by two lateral edges BB. The partial strips 20 extend laterally to the central portion 18. The central portion 18 is for example a portion extending between two printed images, but may have a lateral dimension of "0".

Il est à noter que la portion centrale 18 et les bandes partielles 20 sont des parties de la même bande à imprimer 14, la bande à imprimer 14 étant continue sur toute sa largeur. Les bandes partielles sont donc des bandes « virtuelles ».L'ensemble d'impression 4 définit pour la bande à imprimer 14 une pluralité de trajets s'étendant entre les unités d'impression 6, 8. Chaque trajet est le chemin parcouru par un point imaginaire sur la bande à imprimer 14 entre les deux unités d'impression 6, 8.It should be noted that the central portion 18 and the partial strips 20 are parts of the same print band 14, the print band 14 being continuous over its entire width. Partial bands are therefore "virtual" bands. 4 for the print tape 14 defines a plurality of paths extending between the print units 6, 8. Each path is the path traveled by an imaginary point on the print tape 14 between the two print units. printing 6, 8.

La presse d'impression comprend des moyens de compensation 30 définissant des trajets de compensation de la bande à imprimer, par exemple TCO1, TCO2, TCO3, TCO4, entre les deux unités d'impression amont 6 et aval 8. La portion centrale 18 définit un trajet central TCE qui est montré à la figure 2.The printing press comprises compensation means 30 defining compensation paths of the band to be printed, for example TCO1, TCO2, TCO3, TCO4, between the two upstream and downstream printing units 6. The central portion 18 defines a central TCE path that is shown at the figure 2 .

Dans le cas des Figures 5 et 6, les trajets de compensation sont plus longs que le trajet central TCE de la portion centrale 18 de la bande. Le trajet central est un trajet en libre suspension de la portion centrale 18 de la bande à imprimer entre les deux unités d'impression amont 6 et aval 8. Le trajet central est donc un trajet neutre et la portion 18 est une portion neutre. En l'occurrence, le trajet en libre suspension coïncide avec le plan d'interstice P-P.In the case of Figures 5 and 6 the compensation paths are longer than the central path TCE of the central portion 18 of the band. The central path is a free-hanging path of the central portion 18 of the band to be printed between the two upstream printing units 6 and 8 downstream. The central path is therefore a neutral path and the portion 18 is a neutral portion. In this case, the free suspension path coincides with the interstice plane PP.

Dans d'autres configurations des moyens de compensation 30, le trajet neutre peut être à des emplacements différent du trajet central.In other configurations of compensation means 30, the neutral path may be at different locations from the central path.

Les moyens de compensation 30 comprennent un élément de déviation 32 adapté pour entrer en contact avec la bande à imprimer afin de dévier les parties voulues de cette bande. L'élément de déviation 32 définit les trajets de compensation TCO1, TCO2, TCO3, TCO4.The compensation means 30 comprise a deflection element 32 adapted to come into contact with the band to be printed in order to deflect the desired parts of this band. The deflection element 32 defines the compensation paths TCO1, TCO2, TCO3, TCO4.

Les trajets de compensation TCO1, TCO2 sont associés à une première des demi-largeurs d'impression LD et les trajets de compensation TCO3, TCO4 sont associés une seconde des demi-largeurs d'impression LD.The compensation paths TCO1, TCO2 are associated with a first of the half printing widths LD and the compensation paths TCO3, TCO4 are associated one second with the half printing widths LD.

Dans le cas des Figures 5 et 6, pour à chaque fois deux de ces trajets de compensation TCO1, TCO2 ou TCO3, TCO4 disposés sur une même demi-largeur d'impression LD, le trajet de compensation plus près de la portion centrale 18 est moins long que le trajet de compensation plus éloigné de la portion centrale. En d'autres termes, les trajets de compensation TCO2, TCO3 sont moins longs que les trajets de compensation TCO1, TCO4.In the case of Figures 5 and 6 for each of two of these compensation paths TCO1, TCO2 or TCO3, TCO4 arranged on the same half-print width LD, the compensating path closer to the central portion 18 is shorter than the compensation path more away from the central portion. In other words, the compensation paths TCO2, TCO3 are shorter than the compensation paths TCO1, TCO4.

L'élément de déviation 32 est un ensemble de plusieurs organes de déviation 36. Chaque organe de déviation 36 s'étend sur une partie de la largeur de la bande à imprimer 14 ou de la largeur d'impression. Chaque organe de déviation 36 est adapté pour dévier la bande partielle 20 associée de la bande à imprimer afin de définir un ou plusieurs des trajets de compensation. En l'occurrence, chacun des organes de déviation 36 s'étend sur une largeur sensiblement identique à la largeur d'une image à imprimer, d'une page à imprimer ou d'une plaque d'impression.The deflection element 32 is an assembly of several deflection members 36. Each deflection member 36 extends over a portion of the width of the print tape 14 or print width. Each deflection member 36 is adapted to deflect the associated partial band 20 of the print tape to define one or more of the compensation paths. In this case, each of the deflection members 36 extends over a width substantially the same as the width of an image to be printed, a page to be printed or a printing plate.

En l'occurrence, chacun des organes de déviation 36 est une barre de déviation. Dans l'exemple montré sur les figures, l'élément de déviation 32 comporte quatre organes de déviation.In this case, each of the deflection members 36 is a deflection bar. In the example shown in the figures, the deflection element 32 comprises four deflection members.

Chaque organe de déviation 36 est une pièce distincte des autres organes de déviation.Each deflection member 36 is a separate part from the other deflection members.

Chaque organe de déviation 36 est mobile en translation perpendiculairement par rapport au plan d'interstice P-P, et ceci indépendamment de tous les autres organes de déviation 36. En variante, chaque organe de déviation 36 est mobile en translation selon une direction ayant une composante perpendiculaire au plan P-P, et ceci indépendamment de tous les autres organes de déviation 36.Each deflection member 36 is movable in translation perpendicularly with respect to the interstice plane PP, and this independently of all the other deflection members 36. In a variant, each deflection member 36 is movable in translation along a direction having a perpendicular component in the plane PP, and this independently of all the other deflection members 36.

De plus, chaque organe de déviation 36 est mobile en inclinaison par rapport au plan d'interstice P-P et notamment mobile en rotation autour d'un axe d'inclinaison AI (cf.In addition, each deflection member 36 is movable in inclination with respect to the interplanar plane P-P and in particular rotatable about an inclination axis AI (cf.

Figure 6) , et ceci indépendamment de tous les autres organes de déviation 36. Figure 6 ), and this independently of all the other deflection members 36.

Afin d'obtenir la mobilité en translation et en inclinaison, les moyens de compensation 30 comprennent, pour chaque organe de déviation 36, deux éléments de support 40. Chaque extrémité de chaque organe de déviation 36 est fixée à un des deux éléments de support 40. Chaque élément 40 est déplaçable perpendiculairement par rapport au plan d'interstice P-P indépendamment de tous les autres éléments de support 40. La liaison entre l'élément de support 40 et l'extrémité associée est obtenue par un joint articulé dont l'axe est perpendiculaire à la ligne médiane M-M.In order to obtain mobility in translation and in inclination, the compensation means 30 comprise, for each deflection member 36, two support members 40. Each end of each deflection member 36 is attached to one of the two support members 40 Each element 40 is displaceable perpendicular to the gap plane PP independently of all the other support elements 40. The connection between the support element 40 and the associated end is obtained by an articulated joint whose axis is perpendicular to the median line MM.

Les moyens de compensation 30 comprennent également pour chaque organe de déviation 36 deux actionneurs 42 adaptés pour déplacer un ou les deux éléments de support 40 en fonction d'un signal de commande. Il y a deux supports 40 par organe de déviation 36, donc deux actionneurs 42 par organe de déviation 36.The compensation means 30 also comprise, for each deflection member 36, two actuators 42 adapted to move one or both of the support members 40 as a function of a control signal. There are two supports 40 per deflection member 36, thus two actuators 42 per deflection member 36.

L'ensemble 4 comprend également un dispositif de contrôle 50. Le dispositif de contrôle 50 comprend, pour chaque bande partielle 20 ou trajet de compensation TCO1 à TCO4, un capteur 54 adapté pour déterminer l'écart longitudinal entre une image imprimée par l'unité d'impression amont 4 et l'image imprimée par l'unité d'impression aval 6 sur la bande partielle ou le trajet de compensation associé. De préférence, la lecture des écarts longitudinaux s'effectue pour toutes les couleurs en aval de l'unité d'impression la plus en aval.The assembly 4 also comprises a control device 50. The control device 50 comprises, for each partial band 20 or compensation path TCO1 to TCO4, a sensor 54 adapted to determine the longitudinal difference between an image printed by the unit. 4 and the image printed by the downstream printing unit 6 on the partial band or the associated compensation path. Preferably, the longitudinal differences are read for all the colors downstream of the printing unit furthest downstream.

Dans une variante, un capteur 54 est disposé par bande partielle 20 sur chaque côté de la bande et la mesure est effectuée au recto et verso de chaque bande partielle et une moyenne est calculée des deux valeurs d'écart déterminées pour chaque bande partielle 20.In a variant, a sensor 54 is arranged in partial strip 20 on each side of the strip and the measurement is made on the front and back of each partial strip and an average is calculated of the two deviation values determined for each partial strip 20.

Le dispositif de contrôle 50 comprend également une unité d'évaluation et de commande qui est adaptée pour envoyer un signal de commande vers les actionneurs 42 associés à la bande partielle 20 ou au trajet de compensation et de déplacer l'organe de déviation 36 de telle sorte que l'écart longitudinal soit diminué.The control device 50 also comprises an evaluation and control unit which is adapted to send a control signal to the actuators 42 associated with the partial band 20 or to the compensation path and to move the deflection member 36 of such so that the longitudinal gap is decreased.

Chacun des organes de déviation 36 comporte également d'une part des trous de sortie d'air adaptés pour créer un coussin d'air entre la bande à imprimer 14 et l'organe de déviation 36 et d'autre part un dispositif d'alimentation 60 adapté pour alimenter en air uniquement les trous de sortie d'air des organes de déviation 36 définissant un trajet de compensation, mais non pas les trous de sortie d'air de chaque organe de déviation ne définissant pas un trajet de compensation. En d'autres termes, le dispositif d'alimentation 60 est adapté pour alimenter en air uniquement les trous de sortie d'air des organes de déviation qui, en l'absence du coussin d'air seraient en contact avec la bande à imprimer.Each of the deflection members 36 also comprises, on the one hand, air outlet holes adapted to create an air cushion between the printing tape 14 and the deflection member 36, and on the other hand a feed device 60 adapted to supply air only the air outlet holes of the deflection members 36 defining a compensation path, but not the air outlet holes of each deflection member not defining a compensation path. In other words, the supply device 60 is adapted to supply air only to the air outlet holes of the deflection members which, in the absence of the air bag, would be in contact with the band to be printed.

Le dispositif d'alimentation 60 est à cet effet relié au dispositif de contrôle 50 et l'alimentation d'air de l'organe de déviation 36 est mise en route ou arrêtée par le dispositif 50 en fonction de la position et/ou de l'inclinaison des organes de déviation 36.The supply device 60 is for this purpose connected to the control device 50 and the air supply of the deflection member 36 is switched on or off by the device 50 as a function of the position and / or the inclination of deflection members 36.

Les figures 5 et 6 montrent d'une manière exemplaire la position des organes de déviation lors d'une correction d'un défaut d'impression correspondant à la Figure 11. On voit que les organes de déviation 36 associés au trajet de correction TCO2 et TCO3 sont inclinés par rapport au plan d'interstice P-P, mais que leurs extrémités associées au trajet central TCE ou trajet neutre sont dans une position dans laquelle le trajet central suit le trajet neutre. et n'est pas décalé du plan d'interstice P-P. Les organes 36 associés au trajet de correction TCO1 et TCO4 par contre sont inclinés par rapport au plan d'interstice P-P et sont décalés vers la bande à imprimer 14 de telle sorte que la bande à imprimer 14 soit décalée du plan d'interstice P-P.The figures 5 and 6 show in an exemplary manner the position of the deflecting members during a correction of a printing defect corresponding to the Figure 11 . It can be seen that the deflection members 36 associated with the correction path TCO2 and TCO3 are inclined with respect to the interstice plane PP, but that their ends associated with the central path TCE or neutral path are in a position in which the central path follows the neutral path. and is not offset from the gap plane PP. The members 36 associated with the correction path TCO1 and TCO4, on the other hand, are inclined with respect to the gap plane PP and are shifted towards the band to be printed 14 so that the band 14 to be printed is offset from the gap plane PP.

Sur les Figures 7 et 8, les moyens de compensation 30 sont dans une configuration de correction d'un défaut du type indiqé sur la Figure 12.On the Figures 7 and 8 the compensation means 30 are in a correction configuration of a defect of the type indicated on the Figure 12 .

Les organes de déviation 36 sont configurés de telle sorte que les trajets de compensation TCO2 et TCO3 adjacents au trajet central TCE sont plus longs que les trajets de compensation TCO1 et TCO4 adjacents aux bords BB de la bande. Egalement, dans ce cas, le trajet central TCE et plus long que les trajets de compensation TCO1 à TCO4.The deflection members 36 are configured such that the compensation paths TCO2 and TCO3 adjacent to the central path TCE are longer than the compensation paths TCO1 and TCO4 adjacent the edges BB of the band. Also, in this case, the central path TCE and longer than the compensation paths TCO1 to TCO4.

Selon des configurations non-représentées, les organes de déviation prennent des positions dans lesquelles un défaut d'impression tel qu'indiqué sur la Figure 13 est corrigé. Dans ce cas, les organes de déviation 36 définissent pour une première demi-largeur d'impression trois trajets de compensation adjacents et le trajet de compensation du milieu de ces trajets de compensation est plus long que les deux autres de ces trois trajets de compensation. Egalement, les organes de déviation 36 définissent sur une deuxième demi-largeur d'impression trois autres trajets de compensation et le trajet de compensation du milieu de ces autres trajets de compensation est plus long que les deux autres de ces trois autres trajets de compensation.According to configurations not shown, the deflection members take positions in which a printing defect as indicated on the Figure 13 is corrected. In this case, the deflection members 36 define three adjacent compensation paths for a first half-width of printing and the compensation path of the middle of these compensation paths is longer than the other two of these three. compensation paths. Also, the deflection members 36 define three further compensation paths on a second half printing width and the middle compensation path of these other compensation paths is longer than the other two of these other three compensating paths.

De plus, les trajets de compensation se trouvant sur la première demi-largeur d'impression sont décalés d'un plan parallèle au plan d'interstice (Pl-Pl), ou coïncidant avec ce plan, dans un premier sens et les trajets de compensation se trouvant sur la deuxième demi-largeur d'impression sont décalés de ce plan dans un deuxième sens opposé au premier sens.In addition, the compensating paths on the first half-width of printing are offset from a plane parallel to, or coincident with, the gap plane (P1-P1) in a first direction and compensation on the second half-width of printing are offset from this plane in a second direction opposite the first direction.

En variante, les trajets de compensation se trouvant sur la première demi-largeur d'impression sont décalés d'un plan parallèle au plan d'interstice (Pl-Pl), ou coïncidant avec ce plan, dans un premier sens et les trajets de compensation se trouvant sur la deuxième demi-largeur d'impression sont décalés de ce plan dans le même premier sens.As a variant, the compensation paths on the first half-width of printing are offset by a plane parallel to the plane of gap (P1-P1), or coinciding with this plane, in a first direction and the paths of compensation on the second half-width of printing are offset from this plane in the same direction.

En variante, les organes de déviation 36 sont des rouleaux de déviation. Dans ce cas, chaque organe de déviation est constitué par un rouleau de déviation. Chaque rouleau de déviation est mobile en rotation autour d'un axe de rotation passant par les joints articulés des éléments de support 40.In a variant, the deflection members 36 are deflection rollers. In this case, each deflection member is constituted by a deflection roll. Each deflection roll is rotatable about an axis of rotation passing through the articulated joints of the support members 40.

En variante encore, chaque organe de déviation 36 est un patin de déviation.In another variant, each deflection member 36 is a deflection pad.

Sur les figures 9 et 10 est représenté un deuxième mode de réalisation de l'invention, qui diffère du mode de réalisation précédemment décrit uniquement par ce qui suit.On the Figures 9 and 10 is shown a second embodiment of the invention, which differs from the embodiment previously described only by the following.

Les moyens de compensation 30 comprennent, pour au moins un organe de déviation 36, et de préférence pour chaque organe de déviation, un contre-organe 37 de déviation. Chaque contre-organe de déviation 37 est disposé du côté de la bande 14 opposée à l'organe de déviation 36, de préférence latéralement à la même position que l'organe de déviation associé.The compensation means 30 comprise, for at least one deflection member 36, and preferably for each deflection member, a counter-member 37 for deflection. Each counter-deflection member 37 is disposed on the side of the strip 14 opposite to the deflection member 36, preferably laterally at the same position as the associated deflection member.

D'une manière générale, les organes de déviation 36 sont disposés à une distance suffisante en amont de l'unité d'impression aval pour ne pas influencer le registre latéral. A cet effet, la distance entre l'interstice d'impression 16 de l'unité d'impression amont et les organes de déviation est comprise entre 0% et 50% de la distance entre les interstices de d'impression 16. Particulièrement, la distance entre l'interstice d'impression 16 de l'unité d'impression amont et les organes de déviation est comprise entre 25% et 50% de la distance entre les interstices de d'impression 16. De préférence, la distance entre les organes de déviation 36 et l'interstice d'impression 16 de l'unité d'impression amont ou aval est comprise entre 30cm et 50cm.In general, the deflection members 36 are arranged at a sufficient distance upstream of the downstream printing unit so as not to influence the lateral register. For this purpose, the distance between the printing gap 16 of the upstream printing unit and the deflection members is between 0% and 50% of the distance between the printing interstices 16. the distance between the printing gap 16 of the upstream printing unit and the deflection members is between 25% and 50% of the distance between the printing interstices 16. Preferably, the distance between the organs deflection 36 and the printing gap 16 of the upstream or downstream printing unit is between 30cm and 50cm.

Selon d'autres caractéristiques de l'invention :

  • Le trajet central est le trajet le plus court de tous les trajets de la bande à imprimer entre les unités d'impression amont et aval,
  • L'élément de compensation 30 comporte au moins deux organes de déviation 36 et chaque trajet de compensation défini par l'organe de compensation plus près de la portion centrale 16 est moins long que chaque trajet de compensation défini par l'organe de compensation plus loin de la portion centrale.
  • Tous les organes de déviation 36 sont disposés sur un même côté de la bande.
  • Un ensemble d'impression est utilisé afin de corriger un décalage longitudinal croissant allant d'une partie centrale de la bande à imprimer vers les deux bords de la bande à imprimer de deux images imprimées successivement par l'unité d'impression amont et aval.
  • L'écart de la deuxième image par rapport à la première image est une avance croissant d'une manière continue en allant de la partie centrale vers les deux bords latéraux de la bande
  • L'écart de la deuxième image par rapport à la première image est un retard croissant d'une manière continue en allant de la partie centrale vers les deux bords latéraux de la bande
  • Les moyens de compensation sont adaptés pour prendre une configuration dans laquelle la bande de papier, au niveau des moyens de compensation et vue en coupe à travers toute sa largeur, a une courbure qui a le même signe sur toute la largeur ou forme au moins un point d'inflexion sur sa largeur
  • Chaque demi-largeur d'impression comprend un bord de la bande de papier.
According to other features of the invention:
  • The central path is the shortest path of all the paths of the tape to be printed between the upstream and downstream printing units.
  • The compensation element 30 comprises at least two deflection members 36 and each compensating path defined by the compensation member closer to the central portion 16 is shorter than each compensating path defined by the compensation member further. of the central portion.
  • All the deflection members 36 are arranged on the same side of the strip.
  • A print assembly is used to correct an increasing longitudinal offset from a central portion of the print tape to both edges of the print tape of two images printed successively by the upstream and downstream printing unit.
  • The deviation of the second image from the first image is a continuously increasing advance from the central portion to the two side edges of the web
  • The deviation of the second image from the first image is a continuously increasing delay from the central portion to the two side edges of the web
  • The compensating means are adapted to take a configuration in which the paper web, at the level of the compensating means and sectional view through its entire width, has a curvature which has the same sign over the entire width or forms at least one inflection point on its width
  • Each half-width of printing includes an edge of the paper web.

Claims (13)

  1. A print assembly of the type comprising:
    - an upstream print unit (6) and a downstream print unit (8) adapted to print, one after the other, a strip to be printed (14) over a print width (LI), and
    - comprises compensating means (30),
    wherein:
    - the strip to be printed comprises:
    • a first portion (18), called "neutral portion", intended to follow a first path, called "neutral path" (TCE), along which this neutral portion (18) is not diverted by the compensating means (30) between the upstream (6) and downstream (8) units, and
    • at least a second portion (20), called "partial strip", intended to follow a second path, called "compensation path" (TCO1, TCO2, TCO3, TCO4), along which this partial strip (20) is diverted by the compensating means (30) between the upstream (6) and downstream (8) units, each compensation path being longer than the neutral path that the neutral portion (18) follows,
    - each upstream and downstream unit defines a print interstice (16) and the two print interstices defining an interstice plane (P-P),
    - the two upstream and downstream print units defining a middle line (M-M);
    - the compensation means (30) comprise at least two distinct bypass members (36), adapted to cooperate with the strip to be printed so as to divert the partial strip (20), defining the compensation path (TCO1, TCO2, TCO3, TCO4) between the upstream (6) and downstream (8) units for the partial strip (20),
    characterized in that the bypass members (36) are arranged at a sufficient distance upstream of the downstream print unit not to influence the side lay, the distance between the print interstice (16) of the upstream print unit and the bypass members is between 0% and 50% of the distance between the print interstices (16).
  2. The print assembly according to claim 1, wherein the neutral path is a path of the band to be printed (14) freely suspended between the upstream and downstream print units.
  3. The print assembly according to claim 1 or 2, wherein
    - the print width (LI) is formed by two printing half-widths (LD);
    - at least two compensation paths (TCO1 to TC04) defined by the bypass members are found on a same first printing half-width, and
    - [a] either for two of these compensation paths on said first printing half-width each time, the compensation path closest to the neutral portion (18) is shorter than the compensation path furthest from the neutral portion,
    - [b] or for two of these compensation paths on said first printing half-width each time, the compensation path closest to the neutral portion (18) is longer than the compensation path furthest from the neutral portion,
    - [c] or three compensation paths are found on the first printing half-width and the middle compensation path is longer than the other two of said three compensation paths.
  4. The print assembly according to claim 3, wherein
    - at least two compensation paths (TC01 to TC04) defined by the bypass members (36) are located on a same second printing half-width, and
    - [a] either for two of these compensation paths on said second printing half-width each time, the compensation path closest to the neutral portion (18) is shorter than the compensation path furthest from the neutral portion,
    - [b] or for two of these compensation paths on said second printing half-width each time, the compensation path closest to the neutral portion (18) is longer than the compensation path furthest from the neutral portion,
    - [c] or three compensation paths are found on the second printing half-width and the middle compensation path is longer than the other two of said three compensation paths,
    and wherein in particular the compensation paths located on the first printing half-width being offset from a plane parallel to the interstice plane (PI-PI) in a first direction and the compensation paths being located on the second printing half-width being offset from said plane parallel to the interstice plane (PI-PI) in a second direction
  5. The print assembly according to any one of the preceding claims, wherein the neutral path is a path of a central portion (18) of the strip to be printed.
  6. The print assembly according to any one of the preceding claims, wherein the neutral path is a path of a side portion of the strip to be printed that is laterally offset from a central portion (18).
  7. The print assembly according to any one of the preceding claims, wherein each bypass member (36) is translationally mobile with a component perpendicular relative to the interstice plane (P-P), preferably is mobile independently of each other bypass member.
  8. The print assembly according to any one of the preceding claims, wherein each bypass member is incliningly mobile relative to the interstice plane, in particular rotationally mobile around an incline axis (AI) extending parallel to the interstice plane and the middle line (M-M).
  9. The print assembly according to any one of the preceding claims, wherein each bypass member extends over part of the printing width and is a bypass bar, a bypass roller or a bypass skate.
  10. The print assembly according to any one of the preceding claims, wherein at least two bypass members (36) have air outlet holes adapted to create an air cushion between the strip to be printed (14) and the associated bypass member and in which the assembly has a supply device (60) adapted to supply air only to the air outlet holes of the bypass members defining a compensation path, but not the air outlet holes of each bypass member not defining a compensation path.
  11. The print assembly according to any one of the preceding claims, wherein the compensation means comprise at least one bypass counter-member arranged on the side of the strip opposite the bypass member, preferably laterally in the same position as the associated bypass member.
  12. The print assembly according to any one of the preceding claims, also comprising a control device adapted to determine the longitudinal gap between the images printed by the upstream print unit and the downstream print unit and to act on the compensation means so that this gap is decreased or completely compensated.
  13. A use of an assembly according to any one of the preceding claims, in order to correct an increasing longitudinal shift going from a central portion of the strip to be printed toward the two edges of the strip to be printed of two images printed consecutively by the upstream and downstream print units.
EP11306101.4A 2010-09-07 2011-09-06 Printing assembly and corresponding use Active EP2457730B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1057098A FR2964343B1 (en) 2010-09-07 2010-09-07 PRINTING ASSEMBLY AND USE THEREOF

Publications (2)

Publication Number Publication Date
EP2457730A1 EP2457730A1 (en) 2012-05-30
EP2457730B1 true EP2457730B1 (en) 2013-12-25

Family

ID=43425812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11306101.4A Active EP2457730B1 (en) 2010-09-07 2011-09-06 Printing assembly and corresponding use

Country Status (4)

Country Link
US (1) US20120057916A1 (en)
EP (1) EP2457730B1 (en)
AU (1) AU2011218773A1 (en)
FR (1) FR2964343B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3219502B1 (en) * 2015-12-14 2020-04-08 Ricoh Company, Ltd. Liquid ejection apparatus, liquid ejection system and liquid ejection method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736106A (en) * 1956-02-28 Offen
US1638560A (en) * 1922-09-06 1927-08-09 R Hoe And Co Inc Wrinkle remover for web rolls
US2024618A (en) * 1934-12-13 1935-12-17 Whiting Paper Company Spreading device
AU703647B1 (en) * 1998-06-16 1999-03-25 Qi Press Controls Holding Bv Device to compensate for print misregister due to paper distortion on web offset printing presses
DE19955099B4 (en) * 1999-11-16 2010-02-11 Maschinenfabrik Wifag Rotationskörpergebilde for a Bahnbreitkororrektur
DE10225199B4 (en) * 2002-06-06 2004-05-06 Maschinenfabrik Wifag Fluid-loaded FanOut compensator

Also Published As

Publication number Publication date
AU2011218773A1 (en) 2012-03-22
EP2457730A1 (en) 2012-05-30
FR2964343A1 (en) 2012-03-09
FR2964343B1 (en) 2014-02-28
US20120057916A1 (en) 2012-03-08

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