EP2059393A1 - Device for compensating for the variation in width of a flexible print support and printing machine comprising such a device - Google Patents

Device for compensating for the variation in width of a flexible print support and printing machine comprising such a device

Info

Publication number
EP2059393A1
EP2059393A1 EP07823457A EP07823457A EP2059393A1 EP 2059393 A1 EP2059393 A1 EP 2059393A1 EP 07823457 A EP07823457 A EP 07823457A EP 07823457 A EP07823457 A EP 07823457A EP 2059393 A1 EP2059393 A1 EP 2059393A1
Authority
EP
European Patent Office
Prior art keywords
deflector
printing
support
width
printing medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07823457A
Other languages
German (de)
French (fr)
Other versions
EP2059393B1 (en
Inventor
René NOUHANT
Sébastien NOUHANT
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.)
Diffusion de Materiel et d'Imprimerie
Original Assignee
Diffusion de Materiel et d'Imprimerie
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 Diffusion de Materiel et d'Imprimerie filed Critical Diffusion de Materiel et d'Imprimerie
Priority to PL07823457T priority Critical patent/PL2059393T3/en
Publication of EP2059393A1 publication Critical patent/EP2059393A1/en
Application granted granted Critical
Publication of EP2059393B1 publication Critical patent/EP2059393B1/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
    • B41F13/025—Registering devices

Definitions

  • Device for compensating the variation in width of a flexible printing medium and printing machine comprising such a device
  • the present invention relates to the field of printing, in particular to multi-color printing machines, and more particularly to devices for compensating the variation of width of flexible printing media, such as sheets or strips.
  • the expansion is a function of the basis weight, width and storage conditions of the paper rolls; it can furthermore vary between two successive coils of the same production, or even between the layers of a same coil, the outer layers having been able to undergo creases during their winding and being generally more exposed to atmospheric variations (for example hygrometric) than the inner layers of the coil.
  • Casters arranged at the entrance of each printing unit allow, relying on the paper web, to exert a constraint on it to reduce the width. These casters are adjustable in height to adapt the stress according to the different conditions. The contact with the ink to be avoided, they can only be used on unprinted areas, which considerably limits their scope.
  • air systems are used pulsed by means of nozzles or nozzles installed in place of the previously described wheels, to deform the printable support without contact with the latter.
  • the capacity of deformation of the printing medium by these systems is imperfect because their action is related to the flow of compressed air. If the flow rate is too low, the deformation is insufficient to compensate for the widening of the paper web, and if the flow rate is too high, it runs the risk of damaging or even perforating the paper strip locally at a low speed.
  • the use of these pulsed air devices generates a significant consumption of compressed air and is particularly noisy due to jerky air exhaust.
  • the present invention aims to provide a device for compensating for the width variation of a flexible printing medium that is simple, reliable and applicable to different speeds of scrolling the print medium.
  • the compensation device must also be non-noisy and usable for printed and non-printed surfaces, so preferably without contact with the print medium. It must also be adaptable to all widths of support.
  • the device according to the present invention for compensation of the variation in width of a flexible printing medium, particularly in the form of a sheet or strip, traveling, in particular in a multi-color printing machine, between generally rotary printing means organized in the form of successive printing units, by means of a directed air flow to the print medium to change its flatness, is characterized in that it comprises at least one pair of baffles disposed symmetrically on either side of the scroll axis of the print medium, each baffle comprising an air blowing chamber opening at the surface of the baffle facing the printing medium, oriented towards the rear of the deflector in the direction of the scrolling of said support, so as to produce a flow of air in the form of a blade of air, in order to facilitate, in parallel, the spacing of said support from the surface of the baffle and the accompanying movement drive of said printing medium.
  • the air flow produced by the air blast chamber of the deflector is in the form of a thin air gap, emitted on the surface of the deflector and directed rearward, in the direction of the scroll of the support.
  • This air gap generates an air cushion which simultaneously separates the support from the deflector surface by modifying the flatness of said support and facilitates the scrolling of said support accompanying its movement.
  • the deflector When the deflector is placed, for example, below the support, it is raised locally, and this deformation compensates for its transverse elongation, without contact. Such deformation can therefore have indifferently at the level of the unprinted and printed areas of the support.
  • the blowing chamber is formed, transversely to the axis of travel of the printing medium, of two approximately parallel walls (or slightly diverging from one another in the direction of the printing medium), oriented in the direction of the rear of the deflector in the direction of travel of said support, the two walls being either concave upstream, the other convex downstream, or planar and oblique.
  • the air gap is directed towards the rear of the deflector.
  • the deflector is formed, in the direction of travel of the printing medium, with a front portion and a rear portion mounted on a sole, the rear face of the front portion and the front face of the rear portion forming the walls (for example respectively concave and convex) of the blowing chamber.
  • the front part, the rear part and the sole of the deflector may consist of a single piece or several pieces. According to a preferred embodiment, the rear part of the deflector and the sole form a single piece.
  • the front part of the deflector has an increasing thickness in the direction of travel of the printing medium
  • the rear part has a thickness greater than the front part and comprises from front to rear an oblique leading edge or rounded and a flat surface approximately parallel to the scroll plane of the print medium.
  • the rear face of the deflector is beveled or rounded, the surface facing the printing medium protruding from the surface to the contact the sole, directly above the plane of scroll of said support, so as not to cause the plating of the print medium in the immediate rear of the deflector.
  • the rear part of the deflector has rounded longitudinal flanks.
  • the air blowing chamber advantageously has a central position in the baffle; thus, the air gap is distributed over all the "active" surfaces of the rear part of the baffle so as to avoid contact with the printable medium, and consequently to avoid ink marks on non-contact areas. printed from said medium.
  • the chamber further comprises longitudinal walls formed by inserts to also form shims for adjusting the spacing of the transverse walls between them.
  • the thickness of the air gap can be increased or reduced by modifying said wedges.
  • Said wedges also serve as a seal to prevent lateral leakage of the air flow.
  • the deflectors are stationary, and can be fixed on transverse beams located near the scroll plane of the print medium.
  • the present invention also relates to printing machines of the offset printing type or to gravure or flexographic printing including the device described above.
  • the offset printing machine comprises at least one device for compensating the width variation of the print medium as described above, arranged downstream of at least one printing unit, so as to locally deform the printing medium in order to to compensate for the widening of the width of said support occurring during its printing in the upstream printing unit or groups.
  • the printing machine of the gravure printing or flexographic printing type comprises at least one device for compensating the variation width of the print medium as described above, arranged upstream of at least one printing unit so as to locally deform the printing medium in order to anticipate and compensate for the narrowing of the width of said support, occurring, especially during its drying, downstream of the printing unit.
  • Figure 1 is a longitudinal sectional view of the deflector of a compensation device according to a first embodiment of the invention.
  • FIG. 2 is a cross-sectional view along AA of the deflector of FIG. 1.
  • Figure 3 is a longitudinal sectional view of the deflector according to Figure 1 in the presence of the print medium.
  • FIG. 4 is a front view of the deflector of FIG.
  • Figure 5 is a partial perspective view of a baffle of the compensation device according to the invention.
  • Figure 6 is a perspective view of a baffle of the compensation device according to the invention.
  • Figure 7 is a diagram illustrating the positioning and action of the compensation device in a printing machine according to the invention.
  • Figure 8 is a longitudinal sectional view of the deflector of a compensation device according to a second embodiment of the invention, in the presence of the print medium.
  • each deflector 2 is formed of a sole 3 on which are mounted, in the direction D of the scroll of the paper web, respectively a front portion 4 and a rear portion 5 separated by a chamber 6 blowing air.
  • a first variant of the invention see FIGS.
  • the rear face of the front part 4 is of concave shape matching the convex shape of the front face of the rear part 5.
  • the rear face of the front portion 4 and the front face of the rear portion 5 are flat and oblique (see Figure 8).
  • these two faces slightly spaced apart from one another, form the transverse walls of the blast chamber 6. These two walls are approximately parallel and are oriented, as can be seen in FIGS. 1 and 3, in direction of the rear of the deflector 2 in the direction D of the scrolling of the strip 1 of paper support paper.
  • Recesses 7 and 8 are respectively formed in the rear part 5 of the deflector 2 and in the sole 3 for the supply of compressed air to the blast chamber 6.
  • the air blowing chamber 6 opens out at the surface (here upper surface) of the deflector 2 facing towards the strip 1 of paper and produces a flow of air in the form of an air slit inclined towards said strip 1 and oriented towards the rear of the deflector 2.
  • the upper surface of the deflector is in the form of an upward slope terminated by a "plateau", the upward slope being formed by the upper surface 9 of the front portion 4 and the leading edge 10 of the portion rear 5 of the deflector 2.
  • the rear portion 5 of the deflector terminates in a flat upper surface 11 forming "plate" approximately parallel to the plane of travel of the strip 1 of paper.
  • the scrolling plane is here defined as the plane formed by the printing medium 1 between two successive printing units without intervention of the compensation device according to the invention.
  • the rear portion 5 of the deflector 2 also has rounded longitudinal sides 12 receiving a fraction of the air gap to avoid contact with the printable medium.
  • the rear face 13 of the deflector is further beveled, the flat upper surface 11 protruding, directly above the plane of travel of said strip, the surface 14 which is in contact with the soleplate 3.
  • the rear face 13a of the deflector may be of rounded shape.
  • shims Between the front portion 4 and the rear portion 5 of the baffle, are positioned parts 15, called shims, visible in Figure 5, to separate the two parts 4 and 5 from one another and forming the longitudinal walls of the blowing chamber 6 while serving as a seal of this chamber.
  • an orifice 18 allowing its attachment to the end of the rod of a cylinder (not shown) pneumatic single effect, whose stroke is for example from 10 to 20 millimeters approximately, allowing move the deflector 2 vertically relative to the printable support 1.
  • the deflector 2 also has, at the front end of its sole 3, an end orifice 17 allowing, by means of a screw 16, to fix a guide anti-rotation 21 which ensures the positioning of the deflector parallel to the axis X of scroll of the paper web 1.
  • the printing medium here the strip 1 of paper
  • the printing medium here the strip 1 of paper
  • Its deformation is progressive in the longitudinal direction because it There is a tension of the paper web between the rolls of the successive printing units, but more accentuated in the transverse direction of the paper web (see Figure 4).
  • the air cushion formed by the outgoing air space, in the upper part of the deflector 2 and on the rounded longitudinal sides 12, of the air blowing chamber 6 and the upstream air 19 sucked by effect venturi (and possibly to the downstream air 20 displaced by the flow of air arriving against the paper web) the deformation of said strip 1 is effected without contact with the upper surface of the deflector 2.
  • the scroll of the strip of paper is easier.
  • FIG. 7 schematizes the operation of an offset type printing machine, for example, in four-color process.
  • the strip 1 of paper from a reel scrolls along the X axis passing successively in the printing groups G1, G2, G3 and G4, each affixing a color on said strip.
  • This strip 1 of initial width paper LO has, after passing through the first printing unit G1, a width L10 greater than the width LO, the increase in width being induced by the hygrometric supply and the crushing between the rolls of the printing unit G1.
  • a compensation device for this increase in width consisting of two baffles 2a, is arranged upstream of the input in the next printing unit G2 and reduces the width L10 to a width L20 close to LO.
  • the width of the strip 1 of paper is increased again and has the value L30 which is reduced again by means of a pair of baffles 2b arranged upstream of the passage of the strip 1 in the next printing unit G3.
  • the new width at the entrance of this group G3 is L40 which is approximately equal to the width L20.
  • the width of the band is increased again and takes the value L50 which is in turn compensated by means of a new pair of deflectors 2c.
  • the new width obtained is L60 close to the previous value L40, before the band 1 passes through the last group printing G4.
  • each deflector 2, 2a, 2b or 2c on the strip 1 can be adjusted by raising or lowering the tube vertically. deflector. These adjustments can be made in particular to allow a better superposition of colors printed successively on the paper strip.
  • the deflectors (2, 2a, 2b, 2c) come into action when the printing machine exceeds a certain threshold of revolutions per hour (for example 5000 revolutions / hour) by means of the opening of the pneumatic circuit. which simultaneously feeds the jack and the blast chamber 6 of the baffle; the cylinder then moves the deflector against the printable support 1 (which constitutes the working position) and the flow of compressed air (under a pressure of about 5 to 6 bar) is directed into the blowing chamber 6, then towards the printable medium by forming the air cushion described above.
  • a certain threshold of revolutions per hour for example 5000 revolutions / hour
  • the pneumatic circuit closes: the jack then moves the deflector (for example via a spring integrated in the jack ) due to the absence of pressure, and the air flow through the blowing chamber is interrupted: the deflector spaced apart from the printable medium is then in said rest position.
  • the air flow is regulated by the shims 15 pre-positioned between the front part 4 and the rear part 5 of the deflector and by a pressure regulator (not shown) installed on the compressed air supply.
  • each deflector on the printable support 1 can be carried out manually by the operator, or can be motorized and remotely controlled from the control panel of the machine. It can also be automated and managed by an automatic control system equipped with scanners or cameras, which positioning spots or color markers imposed on the form by the printer and printed on the paper tape. Such a system then constantly controls the positioning of the spots of the successive colors and corrects the defects of color superposition, by intervening on the engines which adapt the constraint of each deflector on the printable support, taking as a reference the color printed in the group G1.
  • the deflector of the compensation device according to the invention has many advantages, in particular:
  • the generally rounded shape of the upper surface of the deflector makes it possible not to hang the paper web, especially during slowing down and stopping the running of the strip 1, unlike conventional blowing nozzles which may at any time damage or to perforate the paper web, whose weight is, for economic reasons, increasingly thin.
  • the compressed air consumption of the compensation device according to the invention is reduced compared with the pulsed air device of the prior art.
  • the air flow being continuous according to the present invention, the sound level in operation is very small.
  • the compensation device adapts to all flexible print media whether they are printed on their entire surface or not.
  • the width of the active zone of a deflector is approximately between 140 and 220 mm 2 .
  • the deflectors In staggered", that is to say on both sides of the scrolling printing medium and not more only one side of the paper web as shown in FIG. 7.
  • the above example has been described for printing machines using an offset printing process but can also be applied to printing machines using gravure or flexographic printing processes.
  • the (or) pairs of deflectors 2 are positioned upstream of each of the printing groups, so as to reduce the width of the print medium before entering said printing unit, in order to anticipate the shrinkage of the paper web occurring at the drying stations located downstream of each printing unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Handling Of Sheets (AREA)
  • Rotary Presses (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Abstract

A device for compensating for the variation in width of a flexible print support (1) progressing through a multicolor printing machine, between successive rotary printing assemblies, by a stream of air directed towards the print support in order to alter its flatness, includes at least one pair of deflectors (2) positioned symmetrically one on each side of the line of travel of the print support, each deflector (2) including an air blowing chamber (6) opening onto the surface (11) of the deflector that faces towards the print support and being directed towards the rear of the deflector in the direction of travel of the support, so as to produce an air stream in the form of a flat sheet of air capable, at the same time, of making it easier to keep the support away from the surface of the deflector and to continue forced travel of the print support.

Description

Dispositif de compensation de la variation de largeur d'un support d'impression souple et machine à imprimer comportant un tel dispositif Device for compensating the variation in width of a flexible printing medium and printing machine comprising such a device
La présente invention concerne le domaine de l'impression, notamment les machines d'impression multi-couleur, et plus particulièrement les dispositifs de compensation de la variation de largeur des supports d'impression souples, tels que les feuilles ou les bandes.The present invention relates to the field of printing, in particular to multi-color printing machines, and more particularly to devices for compensating the variation of width of flexible printing media, such as sheets or strips.
Lors de la réalisation de travaux d'impression sur des feuilles ou bandes de papier, notamment pour des travaux en couleur, on observe fréquemment une variation de la largeur de ces feuilles ou bandes après leur passage dans les groupes imprimants rotatifs successifs. En effet, ces supports d'impression souples (à base de papier ou autre matériau) reçoivent lors de l'encrage un apport hydrométrique important (par exemple dans le procédé d'impression offset) et subissent en même temps un laminage ou foulage entre les cylindres rotatifs (porte-blanchets) qui transfèrent l'encre sur le support d'impression.When performing print jobs on sheets or strips of paper, especially for color jobs, there is frequently a variation in the width of these sheets or strips after their passage in successive rotary printing units. Indeed, these flexible printing media (paper-based or other material) receive during inking a significant hydrometric input (for example in the offset printing process) and at the same time undergo a rolling or crushing between them. rotating cylinders (blankets) which transfer the ink to the print medium.
Ces deux effets cumulés génèrent une dilatation latérale progressive du support imprimé lors de l'impression au niveau de chaque groupe imprimant successif. En ce qui concerne le papier, la dilatation est fonction du grammage, de la largeur et des conditions de stockage des bobines de papier ; elle peut en outre varier entre deux bobines successives d'une même production, voire entre les couches d'une même bobine, les couches externes ayant pu subir des plissures lors de leur enroulement et étant généralement plus exposées aux variations atmosphériques (par exemple hygrométriques) que les couches internes de la bobine.These two cumulative effects generate a progressive lateral dilation of the printed support during printing at each successive printing group. With respect to paper, the expansion is a function of the basis weight, width and storage conditions of the paper rolls; it can furthermore vary between two successive coils of the same production, or even between the layers of a same coil, the outer layers having been able to undergo creases during their winding and being generally more exposed to atmospheric variations (for example hygrometric) than the inner layers of the coil.
Ce phénomène appelé "fan-out" perturbe la superposition des couleurs en quadrichromie, notamment sur les photos, motifs, paysages... dans le sens transversal de la bande de papier. Il entraîne en particulier une dégradation de la définition des photographies car les trames des couleurs imprimées successivement ne sont pas parfaitement superposées ou repérées sur toute la largeur de la bande de papier. Pour contrer ou limiter ce phénomène de "fan-out", divers systèmes sont actuellement utilisés.This phenomenon called "fan-out" disrupts the overlay of colors in four-color process, especially on photos, patterns, landscapes ... in the transverse direction of the paper strip. In particular, it leads to a deterioration of the definition of the photographs because the frames of the successively printed colors are not perfectly superimposed or marked over the entire width of the paper strip. To counter or limit this phenomenon of "fan-out", various systems are currently used.
Des roulettes disposées en entrée de chaque groupe imprimant permettent, en s'appuyant sur la bande de papier, d'exercer une contrainte sur celle-ci afin d'en réduire la largeur. Ces roulettes sont réglables en hauteur afin d'adapter la contrainte en fonction des différentes conditions. Le contact avec l'encre devant être évité, elles ne peuvent être utilisées que sur des zones non imprimées, ce qui limite considérablement leur champ d'application.Casters arranged at the entrance of each printing unit allow, relying on the paper web, to exert a constraint on it to reduce the width. These casters are adjustable in height to adapt the stress according to the different conditions. The contact with the ink to be avoided, they can only be used on unprinted areas, which considerably limits their scope.
Pour éviter les traces laissées par les roulettes, on utilise des systèmes à air puisé au moyen de buses ou gicleurs installés à la place des roulettes précédemment décrites, permettant de déformer le support imprimable sans contact avec ce dernier. Cependant, la capacité de déformation du support d'impression par ces systèmes est imparfaite car leur action est liée au débit d'air comprimé. Si le débit est trop faible, la déformation est insuffisante pour compenser l'élargissement de la bande de papier, et si le débit est trop fort il risque à faible vitesse de la bande de papier d'endommager, voire de perforer localement cette dernière. En outre, l'utilisation de ces dispositifs à air puisé engendre une consommation importante d'air comprimé et est particulièrement bruyante en raison des échappements d'air saccadés.To avoid the traces left by the wheels, air systems are used pulsed by means of nozzles or nozzles installed in place of the previously described wheels, to deform the printable support without contact with the latter. However, the capacity of deformation of the printing medium by these systems is imperfect because their action is related to the flow of compressed air. If the flow rate is too low, the deformation is insufficient to compensate for the widening of the paper web, and if the flow rate is too high, it runs the risk of damaging or even perforating the paper strip locally at a low speed. In addition, the use of these pulsed air devices generates a significant consumption of compressed air and is particularly noisy due to jerky air exhaust.
Pour pallier ces inconvénients, la présente invention a pour but de proposer un dispositif de compensation de la variation de largeur d'un support souple d'impression qui soit simple, fiable et applicable à différentes vitesses de défilement du support d'impression. Le dispositif de compensation devra également être non bruyant et utilisable pour des surfaces imprimées et non- imprimées, donc de préférence sans contact avec le support d'impression. Il devra en outre être adaptable à toutes les largeurs de support.To overcome these drawbacks, the present invention aims to provide a device for compensating for the width variation of a flexible printing medium that is simple, reliable and applicable to different speeds of scrolling the print medium. The compensation device must also be non-noisy and usable for printed and non-printed surfaces, so preferably without contact with the print medium. It must also be adaptable to all widths of support.
A cet effet, le dispositif selon la présente invention de compensation de la variation de largeur d'un support d'impression souple, notamment sous forme de feuille ou bande, défilant, en particulier dans une machine d'impression multi-couleur, entre des moyens d'impression généralement rotatifs organisés sous forme de groupes imprimants successifs, au moyen d'un flux d'air dirigé vers le support d'impression en vue de modifier sa planéité, est caractérisé en ce qu'il comprend au moins une paire de déflecteurs disposés symétriquement de part et d'autre de l'axe de défilement du support d'impression, chaque déflecteur comportant une chambre de soufflage d'air débouchant à la surface du déflecteur tournée vers le support d'impression, orientée en direction de Parrière du déflecteur dans le sens du défilement dudit support, de manière à produire un flux d'air sous la forme d'une lame d'air, en vue de faciliter, en parallèle, l'écartement dudit support de la surface du déflecteur et l'accompagnement de l'entraînement en déplacement dudit support d'impression.For this purpose, the device according to the present invention for compensation of the variation in width of a flexible printing medium, particularly in the form of a sheet or strip, traveling, in particular in a multi-color printing machine, between generally rotary printing means organized in the form of successive printing units, by means of a directed air flow to the print medium to change its flatness, is characterized in that it comprises at least one pair of baffles disposed symmetrically on either side of the scroll axis of the print medium, each baffle comprising an air blowing chamber opening at the surface of the baffle facing the printing medium, oriented towards the rear of the deflector in the direction of the scrolling of said support, so as to produce a flow of air in the form of a blade of air, in order to facilitate, in parallel, the spacing of said support from the surface of the baffle and the accompanying movement drive of said printing medium.
En effet, il a été constaté que l'allongement de la largeur du support d'impression évolue de part et d'autre de l'axe central du support, en s'amplifiant proportionnellement et progressivement au passage dans chaque groupe imprimant en laissant une zone centrale neutre. Cette zone neutre ne nécessitant pas de corrections ou compensations dudit support, sert de référence pour la superposition des couleurs. Les déflecteurs d'une même paire sont donc disposés avantageusement de part et d'autre de cette zone neutre, symétriquement à l'axe de défilement du support d'impression. Dans le cas d'un support de largeur importante, une ou plusieurs paires de déflecteurs supplémentaires peuvent être disposées en s'éloignant de l'axe central, en direction des bords ou lisières du support d'impression.Indeed, it has been found that the elongation of the width of the print medium evolves on either side of the central axis of the support, increasing proportionally and gradually to the passage in each printing group leaving a neutral central area. This neutral zone does not require corrections or compensations of said support, serves as a reference for the superposition of colors. The deflectors of the same pair are therefore advantageously arranged on either side of this neutral zone, symmetrically to the scroll axis of the print medium. In the case of a large width support, one or more pairs of additional baffles may be arranged away from the central axis, towards the edges or edges of the print medium.
Le flux d'air produit par la chambre de soufflage d'air du déflecteur est sous la forme d'une mince lame d'air, émise à la surface du déflecteur et dirigée vers l'arrière, dans le sens du défilement du support. Cette lame d'air génère un coussin d'air qui simultanément écarte le support de la surface du déflecteur en modifiant la planéité dudit support et facilite le défilement dudit support en accompagnant son déplacement.The air flow produced by the air blast chamber of the deflector is in the form of a thin air gap, emitted on the surface of the deflector and directed rearward, in the direction of the scroll of the support. This air gap generates an air cushion which simultaneously separates the support from the deflector surface by modifying the flatness of said support and facilitates the scrolling of said support accompanying its movement.
Lorsque le déflecteur est placé, par exemple, au-dessous du support, celui-ci est surélevé localement, et cette déformation compense son allongement transversal, sans contact. Une telle déformation peut donc avoir lieu indifféremment au niveau des zones non-imprimées et imprimées du support.When the deflector is placed, for example, below the support, it is raised locally, and this deformation compensates for its transverse elongation, without contact. Such deformation can therefore have indifferently at the level of the unprinted and printed areas of the support.
Selon d'autres caractéristiques avantageuses de l'invention :According to other advantageous features of the invention:
- la chambre de soufflage est formée, transversalement à l'axe de défilement du support d'impression, de deux parois approximativement parallèles, (ou s'écartant légèrement l'une de l'autre en direction du support d'impression), orientées en direction de l'arrière du déflecteur dans le sens du défilement dudit support, les deux parois étant soit l'une amont concave, l'autre aval convexe, soit planes et obliques. Ainsi, la lame d'air est dirigée vers l'arrière du déflecteur.the blowing chamber is formed, transversely to the axis of travel of the printing medium, of two approximately parallel walls (or slightly diverging from one another in the direction of the printing medium), oriented in the direction of the rear of the deflector in the direction of travel of said support, the two walls being either concave upstream, the other convex downstream, or planar and oblique. Thus, the air gap is directed towards the rear of the deflector.
- le déflecteur est formé, dans le sens de défilement du support d'impression, d'une partie avant et d'une partie arrière montées sur une semelle, la face arrière de la partie avant et la face avant de la partie arrière formant les parois (par exemple respectivement concave et convexe) de la chambre de soufflage. La partie avant, la partie arrière et la semelle du déflecteur peuvent être constituées d'une pièce unique, ou de plusieurs pièces. Selon un mode de réalisation préféré, la partie arrière du déflecteur et la semelle forment une pièce unique.the deflector is formed, in the direction of travel of the printing medium, with a front portion and a rear portion mounted on a sole, the rear face of the front portion and the front face of the rear portion forming the walls (for example respectively concave and convex) of the blowing chamber. The front part, the rear part and the sole of the deflector may consist of a single piece or several pieces. According to a preferred embodiment, the rear part of the deflector and the sole form a single piece.
- la partie avant du déflecteur présente une épaisseur croissante dans le sens du défilement du support d'impression, et la partie arrière présente une épaisseur supérieure à la partie avant et comporte de l'avant vers l'arrière un bord d'attaque oblique ou arrondi et une surface plane approximativement parallèle au plan de défilement du support d'impression. Ainsi l'air situé entre l'avant du déflecteur et le support d'impression subit, par effet venturi, une aspiration, qui favorise encore les effets précités d'écartement et d'entraînement du support, et réduit la consommation d'air comprimé nécessaire.the front part of the deflector has an increasing thickness in the direction of travel of the printing medium, and the rear part has a thickness greater than the front part and comprises from front to rear an oblique leading edge or rounded and a flat surface approximately parallel to the scroll plane of the print medium. Thus the air located between the front of the baffle and the printing medium undergoes, by venturi effect, suction, which further promotes the aforementioned effects of spacing and drive of the support, and reduces the consumption of compressed air necessary.
- la face arrière du déflecteur est biseautée ou arrondie, la surface tournée vers le support d'impression dépassant la surface au contact de la semelle, à l'aplomb du plan de défilement dudit support, afin de ne pas provoquer le placage du support d'impression à l'arrière immédiat du déflecteur.the rear face of the deflector is beveled or rounded, the surface facing the printing medium protruding from the surface to the contact the sole, directly above the plane of scroll of said support, so as not to cause the plating of the print medium in the immediate rear of the deflector.
- la partie arrière du déflecteur présente des flans longitudinaux arrondis.the rear part of the deflector has rounded longitudinal flanks.
- la chambre de soufflage d'air possède avantageusement une position centrale dans le déflecteur ; ainsi, la lame d'air est répartie sur l'ensemble des surfaces "actives" de la partie arrière du déflecteur afin d'éviter le contact avec le support imprimable, et par conséquent d'éviter les traces d'encre sur les zones non imprimées dudit support.- The air blowing chamber advantageously has a central position in the baffle; thus, the air gap is distributed over all the "active" surfaces of the rear part of the baffle so as to avoid contact with the printable medium, and consequently to avoid ink marks on non-contact areas. printed from said medium.
- la chambre comporte en outre des parois longitudinales formées par des pièces rapportées pour constituer également des cales de réglage de l'écartement des parois transversales entre elles. Ainsi l'épaisseur de la lame d'air peut être augmentée ou réduite en modifiant lesdites cales. Lesdites cales servent également de joint d'étanchéité pour éviter la fuite latérale du flux d'air.- The chamber further comprises longitudinal walls formed by inserts to also form shims for adjusting the spacing of the transverse walls between them. Thus the thickness of the air gap can be increased or reduced by modifying said wedges. Said wedges also serve as a seal to prevent lateral leakage of the air flow.
- les déflecteurs sont stationnaires, et peuvent être fixés sur des poutres transversales situées à proximité du plan de défilement du support d'impression.- The deflectors are stationary, and can be fixed on transverse beams located near the scroll plane of the print medium.
La présente invention concerne également des machines d'impression du type à impression offset ou encore à impression par héliogravure ou flexographie incluant le dispositif décrit ci-dessus.The present invention also relates to printing machines of the offset printing type or to gravure or flexographic printing including the device described above.
La machine à impression offset comporte au moins un dispositif de compensation de la variation de largeur du support d'impression tel que décrit précédemment, disposé en aval d'au moins un groupe imprimant, de manière à déformer localement le support d'impression en vue de compenser l'élargissement de la largeur dudit support survenant lors de son impression dans le ou les groupes imprimants amont.The offset printing machine comprises at least one device for compensating the width variation of the print medium as described above, arranged downstream of at least one printing unit, so as to locally deform the printing medium in order to to compensate for the widening of the width of said support occurring during its printing in the upstream printing unit or groups.
La machine à impression du type à impression par héliogravure ou par flexographie, comporte au moins un dispositif de compensation de la variation de largeur du support d'impression tel que décrit précédemment, disposé en amont d'au moins un groupe imprimant de manière à déformer localement le support d'impression en vue d'anticiper et de compenser le rétrécissement de la largeur dudit support, survenant, notamment lors de son séchage, en aval du groupe imprimant.The printing machine of the gravure printing or flexographic printing type comprises at least one device for compensating the variation width of the print medium as described above, arranged upstream of at least one printing unit so as to locally deform the printing medium in order to anticipate and compensate for the narrowing of the width of said support, occurring, especially during its drying, downstream of the printing unit.
D'autres avantages et détails de la présente invention apparaîtront de la description d'un mode de réalisation, donné à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels :Other advantages and details of the present invention will appear from the description of an embodiment, given by way of non-limiting example, with reference to the appended drawings in which:
La figure 1 est une vue en coupe longitudinale du déflecteur d'un dispositif de compensation selon une première variante de l'invention.Figure 1 is a longitudinal sectional view of the deflector of a compensation device according to a first embodiment of the invention.
La figure 2 est une vue en coupe transversale selon AA du déflecteur de la figure 1.FIG. 2 is a cross-sectional view along AA of the deflector of FIG. 1.
La figure 3 est une vue en coupe longitudinale du déflecteur selon la figure 1 en présence du support d'impression.Figure 3 is a longitudinal sectional view of the deflector according to Figure 1 in the presence of the print medium.
La figure 4 est une vue avant du déflecteur de la figure 3.FIG. 4 is a front view of the deflector of FIG.
La figure 5 est une vue en perspective partielle d'un déflecteur du dispositif de compensation selon l'invention.Figure 5 is a partial perspective view of a baffle of the compensation device according to the invention.
La figure 6 est une vue en perspective d'un déflecteur du dispositif de compensation selon l'invention.Figure 6 is a perspective view of a baffle of the compensation device according to the invention.
La figure 7 est un schéma illustrant le positionnement et l'action du dispositif de compensation dans une machine à imprimer selon l'invention.Figure 7 is a diagram illustrating the positioning and action of the compensation device in a printing machine according to the invention.
La figure 8 est une vue en coupe longitudinale du déflecteur d'un dispositif de compensation selon une deuxième variante de l'invention, en présence du support d'impression.Figure 8 is a longitudinal sectional view of the deflector of a compensation device according to a second embodiment of the invention, in the presence of the print medium.
L'exemple décrit ci-après présente un mode de réalisation d'un dispositif de compensation de la variation de largeur d'un support d'impression souple selon la présente invention, conçu ici pour agir sur un support d'impression constitué par une bande de papier 1 défilant à grande vitesse entre des groupes imprimants successifs G1 , G2, G3 et G4 (voir figure 7). Le dispositif de compensation comprend ici une paire de déflecteurs 2 stationnaires. En référence aux figures 1 à 6, chaque déflecteur 2 est formé d'une semelle 3 sur laquelle sont montées, dans le sens D du défilement de la bande de papier, respectivement une partie avant 4 et une partie arrière 5 séparées par une chambre 6 de soufflage d'air. Selon une première variante de l'invention (cf. figures 1 et 4), la face arrière de la partie avant 4 est de forme concave s'adaptant à la forme convexe de la face avant de la partie arrière 5. Selon une deuxième variante de l'invention, la face arrière de la partie avant 4 et la face avant de la partie arrière 5 sont planes et obliques (cf. figure 8). Dans les deux variantes, ces deux faces, légèrement écartées l'une de l'autre, forment les parois transversales de la chambre de soufflage 6. Ces deux parois sont approximativement parallèles et sont orientées, comme visible sur les figures 1 et 3, en direction de l'arrière du déflecteur 2 dans le sens D du défilement de la bande 1 de papier support d'impression.The example described hereinafter presents an embodiment of a device for compensating for the variation in width of a flexible printing medium according to the present invention, designed here to act on a printing medium consisting of a web paper 1 scrolling at high speed between successive printer groups G1, G2, G3 and G4 (see Figure 7). The compensation device here comprises a pair of stationary deflectors 2. Referring to Figures 1 to 6, each deflector 2 is formed of a sole 3 on which are mounted, in the direction D of the scroll of the paper web, respectively a front portion 4 and a rear portion 5 separated by a chamber 6 blowing air. According to a first variant of the invention (see FIGS. 1 and 4), the rear face of the front part 4 is of concave shape matching the convex shape of the front face of the rear part 5. According to a second variant of the invention, the rear face of the front portion 4 and the front face of the rear portion 5 are flat and oblique (see Figure 8). In both variants, these two faces, slightly spaced apart from one another, form the transverse walls of the blast chamber 6. These two walls are approximately parallel and are oriented, as can be seen in FIGS. 1 and 3, in direction of the rear of the deflector 2 in the direction D of the scrolling of the strip 1 of paper support paper.
Des évidements 7 et 8 sont respectivement ménagés dans la partie arrière 5 du déflecteur 2 et dans la semelle 3 en vue de l'alimentation en air comprimé de la chambre de soufflage 6.Recesses 7 and 8 are respectively formed in the rear part 5 of the deflector 2 and in the sole 3 for the supply of compressed air to the blast chamber 6.
La chambre de soufflage d'air 6 débouche à la surface (ici surface supérieure) du déflecteur 2 tournée vers la bande 1 de papier et produit un flux d'air sous la forme d'une lame d'air inclinée vers ladite bande 1 et orientée en direction de l'arrière du déflecteur 2.The air blowing chamber 6 opens out at the surface (here upper surface) of the deflector 2 facing towards the strip 1 of paper and produces a flow of air in the form of an air slit inclined towards said strip 1 and oriented towards the rear of the deflector 2.
A cet effet, la surface supérieure du déflecteur présente la forme d'une pente ascendante terminée par un "plateau", la pente ascendante étant formée par la surface supérieure 9 de la partie avant 4 et par le bord d'attaque 10 de la partie arrière 5 du déflecteur 2.For this purpose, the upper surface of the deflector is in the form of an upward slope terminated by a "plateau", the upward slope being formed by the upper surface 9 of the front portion 4 and the leading edge 10 of the portion rear 5 of the deflector 2.
La partie arrière 5 du déflecteur, plus haute que la partie avant 4, se termine par une surface supérieure plane 11 formant "plateau" approximativement parallèle au plan du défilement de la bande 1 de papier. Le plan de défilement est ici défini comme le plan formé par le support d'impression 1 entre deux groupes imprimants successifs sans intervention du dispositif de compensation selon l'invention. La partie arrière 5 du déflecteur 2 présente également des flancs longitudinaux arrondis 12 recevant une fraction de la lame d'air afin d'éviter le contact avec le support imprimable. La face arrière 13 du déflecteur est en outre biseautée, la surface supérieure plane 11 dépassant, à l'aplomb du plan de défilement de ladite bande, la surface 14 qui est au contact de la semelle 3.The rear portion 5 of the deflector, higher than the front portion 4, terminates in a flat upper surface 11 forming "plate" approximately parallel to the plane of travel of the strip 1 of paper. The scrolling plane is here defined as the plane formed by the printing medium 1 between two successive printing units without intervention of the compensation device according to the invention. The rear portion 5 of the deflector 2 also has rounded longitudinal sides 12 receiving a fraction of the air gap to avoid contact with the printable medium. The rear face 13 of the deflector is further beveled, the flat upper surface 11 protruding, directly above the plane of travel of said strip, the surface 14 which is in contact with the soleplate 3.
Selon un autre mode de réalisation, représenté en pointillés sur les figures 1 et 3, la face arrière 13a du déflecteur peut être de forme arrondie.According to another embodiment, shown in dashed lines in FIGS. 1 and 3, the rear face 13a of the deflector may be of rounded shape.
Ces formes biseautée ou arrondie permettent au flux d'air aval 20 (représenté sur les figures 3 et 8) montant le long de cette face biseautée d'accompagner la lame d'air déjà formée sous le support d'impression 1 , afin d'éviter le placage dudit support contre l'arrière du déflecteur 2.These beveled or rounded shapes allow the downstream air flow 20 (shown in FIGS. 3 and 8) rising along this beveled face to accompany the air gap already formed under the printing medium 1, in order to avoid plating of said support against the rear of the deflector 2.
Entre la partie avant 4 et la partie arrière 5 du déflecteur, sont positionnées des pièces 15, appelées cales, visibles sur la figure 5, permettant d'écarter les deux pièces 4 et 5 l'une de l'autre et formant les parois longitudinales de la chambre de soufflage 6, tout en servant de joint d'étanchéité de cette chambre.Between the front portion 4 and the rear portion 5 of the baffle, are positioned parts 15, called shims, visible in Figure 5, to separate the two parts 4 and 5 from one another and forming the longitudinal walls of the blowing chamber 6 while serving as a seal of this chamber.
Dans la semelle 3 du déflecteur 2 est ménagé un orifice 18 permettant sa fixation sur l'extrémité de la tige d'un vérin (non représenté) pneumatique à simple effet, dont la course est par exemple de 10 à 20 millimètres environ, permettant de déplacer le déflecteur 2 verticalement par rapport au support imprimable 1. Le déflecteur 2 présente également, à l'extrémité avant de sa semelle 3, un orifice d'extrémité 17 permettant, au moyen d'une vis 16, d'y fixer un guide anti-rotation 21 qui assure le positionnement du déflecteur parallèlement à l'axe X de défilement de la bande de papier 1.In the soleplate 3 of the baffle 2 is provided an orifice 18 allowing its attachment to the end of the rod of a cylinder (not shown) pneumatic single effect, whose stroke is for example from 10 to 20 millimeters approximately, allowing move the deflector 2 vertically relative to the printable support 1. The deflector 2 also has, at the front end of its sole 3, an end orifice 17 allowing, by means of a screw 16, to fix a guide anti-rotation 21 which ensures the positioning of the deflector parallel to the axis X of scroll of the paper web 1.
Comme visible sur les figures 3 et 4, le support d'impression, ici la bande 1 de papier, défilant dans le sens de défilement D est déformé au passage au- dessus du déflecteur 2. Sa déformation est progressive dans le sens longitudinal car il existe une tension de la bande de papier entre les cylindres des groupes d'impression successifs, mais plus accentuée dans le sens transversal de la bande de papier (voir figure 4). Grâce au coussin d'air formé par la lame d'air sortant, en partie supérieure du déflecteur 2 et sur les flancs longitudinaux arrondis 12, de la chambre de soufflage d'air 6 ainsi qu'à l'air amont 19 aspiré par effet venturi (et éventuellement à l'air aval 20 déplacé par le flux d'air arrivant contre la bande de papier), la déformation de ladite bande 1 s'effectue sans contact avec la surface supérieure du déflecteur 2. En outre, le défilement de la bande de papier est facilité.As can be seen in FIGS. 3 and 4, the printing medium, here the strip 1 of paper, moving in the direction of travel D is deformed at the passage above the deflector 2. Its deformation is progressive in the longitudinal direction because it There is a tension of the paper web between the rolls of the successive printing units, but more accentuated in the transverse direction of the paper web (see Figure 4). Thanks to the air cushion formed by the outgoing air space, in the upper part of the deflector 2 and on the rounded longitudinal sides 12, of the air blowing chamber 6 and the upstream air 19 sucked by effect venturi (and possibly to the downstream air 20 displaced by the flow of air arriving against the paper web), the deformation of said strip 1 is effected without contact with the upper surface of the deflector 2. In addition, the scroll of the strip of paper is easier.
La figure 7 schématise le fonctionnement d'une machine à imprimer de type offset, par exemple, en quadrichromie. La bande 1 de papier provenant d'une bobine (non représentée) défile selon l'axe X en passant successivement dans les groupes imprimants G1 , G2, G3 et G4, apposant chacun une couleur sur ladite bande. Cette bande 1 de papier de largeur initiale LO présente après passage dans le premier groupe imprimant G1 une largeur L10 supérieure à la largeur LO, l'augmentation de largeur étant induite par l'apport hygrométrique et le foulage entre les cylindres du groupe imprimant G1.FIG. 7 schematizes the operation of an offset type printing machine, for example, in four-color process. The strip 1 of paper from a reel (not shown) scrolls along the X axis passing successively in the printing groups G1, G2, G3 and G4, each affixing a color on said strip. This strip 1 of initial width paper LO has, after passing through the first printing unit G1, a width L10 greater than the width LO, the increase in width being induced by the hygrometric supply and the crushing between the rolls of the printing unit G1.
Un dispositif de compensation de cette augmentation de largeur, constitué de deux déflecteurs 2a, est disposé en amont de l'entrée dans le groupe imprimant suivant G2 et permet de réduire la largeur L10 jusqu'à une largeur L20 voisine de LO. En aval du groupe imprimant G2, la largeur de la bande 1 de papier est à nouveau augmentée et présente la valeur L30 qui est à nouveau réduite grâce à une paire de déflecteurs 2b disposée en amont du passage de la bande 1 dans le groupe imprimant suivant G3. La nouvelle largeur à l'entrée de ce groupe G3 est L40 qui est approximativement égale à la largeur L20. Après le passage dans le groupe imprimant G3, la largeur de la bande est à nouveau augmentée et prend la valeur L50 qui est à son tour compensée au moyen d'une nouvelle paire de déflecteurs 2c. La nouvelle largeur obtenue est L60 proche de la valeur L40 précédente, avant que la bande 1 ne traverse le dernier groupe imprimant G4.A compensation device for this increase in width, consisting of two baffles 2a, is arranged upstream of the input in the next printing unit G2 and reduces the width L10 to a width L20 close to LO. Downstream of the printing unit G2, the width of the strip 1 of paper is increased again and has the value L30 which is reduced again by means of a pair of baffles 2b arranged upstream of the passage of the strip 1 in the next printing unit G3. The new width at the entrance of this group G3 is L40 which is approximately equal to the width L20. After passing through the printing group G3, the width of the band is increased again and takes the value L50 which is in turn compensated by means of a new pair of deflectors 2c. The new width obtained is L60 close to the previous value L40, before the band 1 passes through the last group printing G4.
De manière optimale, après correction au moyen des déflecteurs 2a, 2b, 2c, la bande 1 retrouve sa largeur initiale, c'est à dire que l'on obtient L60 = L40 = L20 = LO, de sorte que les couleurs successives imprimées se superposent parfaitement à l'impression réalisée sur la bande 1 par le groupe imprimant G1.Optimally, after correction by means of the deflectors 2a, 2b, 2c, the band 1 returns to its initial width, that is to say we obtain L60 = L40 = L20 = LO, so that the successive printed colors are superimposed perfectly on the printing carried out on the band 1 by the printing unit G1.
Le débit du flux d'air apporté dans la chambre de soufflage 6 étant fixé à l'origine, la contrainte ou pression exercée par chaque déflecteur 2, 2a, 2b ou 2c sur la bande 1 peut être ajustée en faisant monter ou descendre verticalement le déflecteur. Ces réglages peuvent être effectués notamment pour permettre une meilleure superposition des couleurs imprimées successivement sur la bande de papier.As the flow rate of the air flow brought into the blowing chamber 6 is set at the origin, the stress or pressure exerted by each deflector 2, 2a, 2b or 2c on the strip 1 can be adjusted by raising or lowering the tube vertically. deflector. These adjustments can be made in particular to allow a better superposition of colors printed successively on the paper strip.
Il peut être prévu que les déflecteurs (2, 2a, 2b, 2c) entrent en action lorsque la machine à imprimer dépasse un certain seuil de révolutions par heure (par exemple 5 000 révolutions/heure) au moyen de l'ouverture du circuit pneumatique qui alimente simultanément le vérin et la chambre de soufflage 6 du déflecteur ; le vérin déplace alors le déflecteur contre le support imprimable 1 (ce qui constitue la position de travail) et le flux d'air comprimé (sous une pression voisine de 5 à 6 bars) est dirigé dans la chambre de soufflage 6, puis en direction du support imprimable en formant le coussin d'air décrit précédemment. Lorsque la machine à imprimer passe au-dessous du seuil (fixé par exemple à 5 000 révolutions/heure), le circuit pneumatique se ferme : le vérin écarte alors le déflecteur (par l'intermédiaire par exemple d'un ressort intégré dans le vérin) en raison de l'absence de pression, et le flux d'air traversant la chambre de soufflage est interrompu : le déflecteur écarté du support imprimable est alors en position dite de repos.It can be provided that the deflectors (2, 2a, 2b, 2c) come into action when the printing machine exceeds a certain threshold of revolutions per hour (for example 5000 revolutions / hour) by means of the opening of the pneumatic circuit. which simultaneously feeds the jack and the blast chamber 6 of the baffle; the cylinder then moves the deflector against the printable support 1 (which constitutes the working position) and the flow of compressed air (under a pressure of about 5 to 6 bar) is directed into the blowing chamber 6, then towards the printable medium by forming the air cushion described above. When the printing machine passes below the threshold (set for example at 5,000 revolutions / hour), the pneumatic circuit closes: the jack then moves the deflector (for example via a spring integrated in the jack ) due to the absence of pressure, and the air flow through the blowing chamber is interrupted: the deflector spaced apart from the printable medium is then in said rest position.
En fonctionnement (position dite active du déflecteur), le débit d'air est réglé par les cales 15 pré-positionnées entre la partie avant 4 et la partie arrière 5 du déflecteur et par un régulateur de pression (non représenté) installé sur l'alimentation en air comprimé.In operation (so-called active position of the deflector), the air flow is regulated by the shims 15 pre-positioned between the front part 4 and the rear part 5 of the deflector and by a pressure regulator (not shown) installed on the compressed air supply.
L'ajustement de la contrainte exercée par chaque déflecteur sur le support imprimable 1 peut être effectué manuellement par l'opérateur, ou être motorisé et piloté à distance à partir du pupitre de contrôle de la machine. Il peut être également automatisé et géré par un système de contrôle automatique pourvu de scanners ou caméras, qui pilote par comparaison de positionnement les spots ou repères de couleurs imposés sur la forme par l'imprimeur et imprimés sur la bande de papier. Un tel système contrôle alors en permanence le positionnement des spots des couleurs successives et corrige les défauts de superposition des couleurs, en intervenant sur les moteurs qui adaptent la contrainte de chaque déflecteur sur le support imprimable, en prenant comme référence la couleur imprimée dans le groupe G1.The adjustment of the stress exerted by each deflector on the printable support 1 can be carried out manually by the operator, or can be motorized and remotely controlled from the control panel of the machine. It can also be automated and managed by an automatic control system equipped with scanners or cameras, which positioning spots or color markers imposed on the form by the printer and printed on the paper tape. Such a system then constantly controls the positioning of the spots of the successive colors and corrects the defects of color superposition, by intervening on the engines which adapt the constraint of each deflector on the printable support, taking as a reference the color printed in the group G1.
Le déflecteur du dispositif de compensation conforme à l'invention présente de nombreux avantages, en particulier :The deflector of the compensation device according to the invention has many advantages, in particular:
La forme globalement arrondie de la surface supérieure du déflecteur permet de ne pas accrocher la bande de papier notamment lors du ralentissement et de l'arrêt du défilement de la bande 1 , contrairement aux buses de soufflages classiques qui risquent à tout moment d'endommager ou de perforer la bande de papier, dont le grammage est, pour des raisons économiques, de plus en plus fin.The generally rounded shape of the upper surface of the deflector makes it possible not to hang the paper web, especially during slowing down and stopping the running of the strip 1, unlike conventional blowing nozzles which may at any time damage or to perforate the paper web, whose weight is, for economic reasons, increasingly thin.
La consommation en air comprimé du dispositif de compensation, selon l'invention, est réduite par rapport au dispositif à air puisé de l'art antérieur. En outre, le flux d'air étant continu selon la présente invention, le niveau sonore en fonctionnement est très réduit.The compressed air consumption of the compensation device according to the invention is reduced compared with the pulsed air device of the prior art. In addition, the air flow being continuous according to the present invention, the sound level in operation is very small.
Le dispositif de compensation s'adapte à tous les supports d'impression souples qu'ils soient imprimés sur la totalité de leur surface ou non.The compensation device adapts to all flexible print media whether they are printed on their entire surface or not.
Enfin pour des utilisations de bande de papier de largeur plus importante, il est possible d'augmenter le nombre de paires de déflecteurs utilisées, réparties transversalement en amont ou en aval d'un groupe d'impression.Finally, for uses of paper tape of greater width, it is possible to increase the number of pairs of deflectors used, distributed transversely upstream or downstream of a printing unit.
A titre d'exemple non limitatif, la largeur de la zone active d'un déflecteur est approximativement comprise entre 140 et 220 mm2.By way of non-limiting example, the width of the active zone of a deflector is approximately between 140 and 220 mm 2 .
Pour des machines d'impression pour lesquelles l'espace disponible est réduit, il est possible de disposer les déflecteurs "en quinconce", c'est-à-dire de part et d'autre du support d'impression défilant et non plus d'un seul côté de la bande de papier comme représentée sur la figure 7. L'exemple ci-dessus a été décrit pour des machines d'impression utilisant un procédé d'impression offset mais peut s'appliquer également aux machines d'impression utilisant des procédés d'impression par héliogravure ou par flexographie. Dans ce cas, la (ou les) paires de déflecteurs 2 sont positionnés en amont de chacun des groupes imprimants, de manière à réduire la largeur du support d'impression avant son entrée dans ledit groupe imprimant, afin d'anticiper le rétrécissement de la bande de papier survenant au niveau des postes de séchage disposés en aval de chaque groupe imprimant. For printing machines for which the available space is reduced, it is possible to have the deflectors "in staggered", that is to say on both sides of the scrolling printing medium and not more only one side of the paper web as shown in FIG. 7. The above example has been described for printing machines using an offset printing process but can also be applied to printing machines using gravure or flexographic printing processes. In this case, the (or) pairs of deflectors 2 are positioned upstream of each of the printing groups, so as to reduce the width of the print medium before entering said printing unit, in order to anticipate the shrinkage of the paper web occurring at the drying stations located downstream of each printing unit.

Claims

REVENDICATIONS
1. Dispositif de compensation de la variation de largeur d'un support d'impression (1) souple, notamment sous forme de feuille ou bande, défilant, en particulier dans une machine d'impression multi-couleur, entre des moyens d'impression généralement rotatifs organisés sous forme de groupes imprimants (G-i, G2, G3, G4) successifs, au moyen d'un flux d'air dirigé vers le support d'impression (1) en vue de modifier sa planéité, caractérisé en ce qu'il comprend au moins une paire de déflecteurs (2, 2a, 2a, 2c) disposés symétriquement de part et d'autre de l'axe de défilement (X) du support d'impression (1), chaque déflecteur comportant une chambre (6) de soufflage d'air débouchant à la surface du déflecteur tournée vers le support d'impression (1) et étant orientée en direction de l'arrière du déflecteur dans le sens du défilement (D) dudit support, de manière à produire un flux d'air sous la forme d'une lame d'air en vue de faciliter, en parallèle, l'écartement dudit support de la surface du déflecteur et l'accompagnement de l'entraînement en déplacement dudit support d'impression (1 ).1. Device for compensating the variation in width of a flexible printing medium (1), in particular in the form of a sheet or strip, traveling, in particular in a multi-color printing machine, between printing means generally rotating arranged in the form of successive printing units (Gi, G 2 , G 3 , G 4 ), by means of a flow of air directed towards the printing medium (1) in order to modify its flatness, characterized in it comprises at least one pair of deflectors (2, 2a, 2a, 2c) arranged symmetrically on either side of the scroll axis (X) of the printing medium (1), each deflector comprising a an air blast chamber (6) opening at the surface of the deflector facing the printing medium (1) and being directed towards the rear of the deflector in the direction of travel (D) of said support, so as to produce a stream of air in the form of a blade of air to facilitate, in parallel, spreads said support of the surface of the deflector and the accompanying movement drive of said printing medium (1).
2. Dispositif selon la revendication 1 , caractérisé en ce que la chambre (6) de soufflage est formée, transversalement à l'axe de défilement (X) du support d'impression (1), de deux parois approximativement parallèles, orientées en direction de l'arrière du déflecteur (2) dans le sens du défilement (D) dudit support, les deux parois étant soit l'une amont concave, l'autre aval convexe, soit planes et obliques.2. Device according to claim 1, characterized in that the chamber (6) for blowing is formed, transversely to the axis of travel (X) of the printing medium (1), two walls approximately parallel, oriented in the direction the rear of the deflector (2) in the direction of travel (D) of said support, the two walls being either concave upstream, the other convex downstream, or planar and oblique.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le déflecteur (2, 2a, 2a, 2c) est formé, dans le sens de défilement (D) du support d'impression (1), d'une partie avant (4) et d'une partie arrière (5) montées sur une semelle (3), la face arrière de la partie avant (4) et la face avant de la partie arrière (5) formant les parois de la chambre (6) de soufflage.3. Device according to claim 1 or 2, characterized in that the deflector (2, 2a, 2a, 2c) is formed, in the direction of travel (D) of the print medium (1), a front portion (4) and a rear portion (5) mounted on a sole (3), the rear face of the front portion (4) and the front face of the rear portion (5) forming the walls of the chamber (6) blowing.
4. Dispositif selon la revendication 3, caractérisé en ce que la partie arrière (5) du déflecteur et la semelle (3) forment une pièce unique.4. Device according to claim 3, characterized in that the rear portion (5) of the deflector and the sole (3) form a single piece.
5. Dispositif selon la revendication 3 ou 4, caractérisé en ce que la partie avant (4) du déflecteur (2, 2a, 2a, 2c) présente une épaisseur croissante dans le sens du défilement (D) du support d'impression (1 ), et en ce que la partie arrière (5) présente une épaisseur supérieure à la partie avant (4) et comporte de l'avant vers l'arrière un bord d'attaque (10) arrondi et une surface plane (11) approximativement parallèle au plan de défilement du support d'impression (1 ).5. Device according to claim 3 or 4, characterized in that the front part (4) of the deflector (2, 2a, 2a, 2c) has an increasing thickness in the direction of travel (D) of the print medium (1), and in that the rear portion (5) has a thickness greater than the front portion (4) and comprises from the front to the rear an edge of rounded approach (10) and a flat surface (11) approximately parallel to the running plane of the printing medium (1).
6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la face arrière(13; 13a) du déflecteur (2, 2a, 2a, 2c) est biseautée ou arrondie, la surface tournée vers le support d'impression (1) dépassant la surface au contact de la semelle (3), à l'aplomb du plan de défilement dudit support.6. Device according to any one of the preceding claims, characterized in that the rear face (13; 13a) of the deflector (2, 2a, 2a, 2c) is bevelled or rounded, the surface facing the printing medium ( 1) exceeding the surface in contact with the sole (3), directly above the plane of travel of said support.
7. Dispositif selon l'une quelconque des revendications 3 à 6, caractérisé en ce que la partie arrière (5) du déflecteur (2, 2a, 2a, 2c) présente des flans longitudinaux (12) arrondis.7. Device according to any one of claims 3 to 6, characterized in that the rear portion (5) of the deflector (2, 2a, 2a, 2c) has longitudinal flanks (12) rounded.
8. Dispositif selon l'une quelconque des revendications 2 à 7, caractérisé en ce que la chambre (6) de soufflage comporte en outre des parois longitudinales formées par des pièces rapportées pour constituer également des cales (15) de réglage de l'écartement des parois transversales entre elles.8. Device according to any one of claims 2 to 7, characterized in that the chamber (6) for blowing further comprises longitudinal walls formed by inserts to form also wedges (15) for adjusting the spacing transverse walls between them.
9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les déflecteurs (2, 2a, 2a, 2c) sont stationnaires.9. Device according to any one of the preceding claims, characterized in that the baffles (2, 2a, 2a, 2c) are stationary.
10. Machine à impression du type à impression offset, caractérisée en ce qu'elle comporte au moins un dispositif de compensation de la variation de largeur du support d'impression (1) conforme à l'une quelconque des revendications 1 à 9, disposé en aval d'au moins un groupe imprimant (G-i, G2, G3, G4) , de manière à déformer localement le support d'impression (1) en vue de compenser l'élargissement de la largeur dudit support survenant lors de son impression.Printing machine of the offset printing type, characterized in that it comprises at least one device for compensating the variation in width of the printing medium (1) according to any one of Claims 1 to 9, arranged downstream of at least one printing unit (Gi, G 2 , G 3 , G 4 ), so as to locally deform the printing medium (1) in order to compensate for the widening of the width of said support occurring during its impression.
11. Machine à impression du type à impression par héliogravure ou par flexographie, caractérisée en ce qu'elle comporte au moins un dispositif de compensation de la variation de largeur du support d'impression (1) conforme à l'une quelconque des revendications 1 à 9, disposé en amont d'au moins un groupe imprimant (G-i, G2, G3, G4) de manière à déformer localement le support d'impression en vue d'anticiper et de compenser le rétrécissement de la largeur dudit support, survenant, notamment lors de son séchage, en aval du groupe imprimant (Gi, G2, G3, G4). 11. A printing machine of the gravure printing or flexographic printing type, characterized in that it comprises at least one device for compensating the variation of the width of the printing medium (1) according to any one of claims 1 9, arranged upstream of at least one printing unit (Gi, G 2 , G 3 , G 4 ) so as to locally deform the printing medium in order to anticipate and compensate for the shrinkage of the width of said support, occurring, in particular during its drying, downstream of the printing unit (Gi, G 2 , G 3 , G 4 ).
EP07823457A 2006-09-04 2007-08-29 Device for compensating for the variation in width of a flexible print support and printing machine comprising such a device Not-in-force EP2059393B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07823457T PL2059393T3 (en) 2006-09-04 2007-08-29 Device for compensating for the variation in width of a flexible print support and printing machine comprising such a device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0607714A FR2905302B1 (en) 2006-09-04 2006-09-04 DEVICE FOR COMPENSATING THE WIDTH VARIATION OF A FLEXIBLE PRINTING MEDIUM AND PRINTING MACHINE COMPRISING SUCH A DEVICE.
PCT/FR2007/001412 WO2008029013A1 (en) 2006-09-04 2007-08-29 Device for compensating for the variation in width of a flexible print support and printing machine comprising such a device

Publications (2)

Publication Number Publication Date
EP2059393A1 true EP2059393A1 (en) 2009-05-20
EP2059393B1 EP2059393B1 (en) 2010-01-06

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EP07823457A Not-in-force EP2059393B1 (en) 2006-09-04 2007-08-29 Device for compensating for the variation in width of a flexible print support and printing machine comprising such a device

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US (1) US8313260B2 (en)
EP (1) EP2059393B1 (en)
AT (1) ATE454266T1 (en)
DE (1) DE602007004232D1 (en)
ES (1) ES2340969T3 (en)
FR (1) FR2905302B1 (en)
PL (1) PL2059393T3 (en)
WO (1) WO2008029013A1 (en)

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Publication number Priority date Publication date Assignee Title
US8960846B2 (en) 2012-07-11 2015-02-24 Hewlett-Packard Industrial Printing Ltd. Printer and method for inkjet printing on a flexible substrate
US9423177B2 (en) 2013-02-22 2016-08-23 Ricoh Company, Ltd. Force-balancing gas flow in dryers for printing systems
WO2016128144A1 (en) * 2015-02-12 2016-08-18 Bobst Mex Sa Band support and stabilisation unit for a printing head and printing station equipped in this way
CN107704648B (en) * 2017-08-22 2020-02-18 武汉理工大学 Service life prediction method of hollow plate hinge joint based on relative displacement limit equation

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US4696230A (en) * 1986-09-25 1987-09-29 Barkley Corporation Adjustable bustle-forming apparatus for maintaining registration of multicolor images on printing webs
EP0788878B1 (en) * 1996-02-09 2000-05-17 Heidelberger Druckmaschinen Aktiengesellschaft Method and means for guiding a web between two cylinders of a printing machine
DE59702848D1 (en) * 1996-10-25 2001-02-08 Koenig & Bauer Albert Ag Device for correcting the fan-out effect on web-fed rotary printing machines
JP3246557B2 (en) 1996-10-25 2002-01-15 ケーニツヒ ウント バウエル アクチエンゲゼルシヤフト Apparatus for correcting fan-out effects in web rotary printing presses
US6936137B2 (en) * 2001-10-24 2005-08-30 Honeywell International Inc. Air clamp stabilizer for continuous web materials

Non-Patent Citations (1)

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Title
See references of WO2008029013A1 *

Also Published As

Publication number Publication date
US20100054840A1 (en) 2010-03-04
WO2008029013A1 (en) 2008-03-13
US8313260B2 (en) 2012-11-20
DE602007004232D1 (en) 2010-02-25
EP2059393B1 (en) 2010-01-06
FR2905302A1 (en) 2008-03-07
ES2340969T3 (en) 2010-06-11
FR2905302B1 (en) 2008-11-07
PL2059393T3 (en) 2010-08-31
ATE454266T1 (en) 2010-01-15

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