EP2059393B1 - 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 Download PDFInfo
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- EP2059393B1 EP2059393B1 EP07823457A EP07823457A EP2059393B1 EP 2059393 B1 EP2059393 B1 EP 2059393B1 EP 07823457 A EP07823457 A EP 07823457A EP 07823457 A EP07823457 A EP 07823457A EP 2059393 B1 EP2059393 B1 EP 2059393B1
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- Prior art keywords
- printing
- deflector
- substrate
- width
- air
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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
- 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.
- forced-air systems are used by means of nozzles or nozzles installed in place of the rollers previously described, making it possible to deform the printable medium 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 forced air devices generates a significant consumption of compressed air and is particularly noisy due to jerky air exhaust.
- EP-A-0838420 discloses a device for compensating the width variation of a print medium according to the preamble of claim 1.
- 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 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 compensation device here comprises a pair of stationary deflectors 2.
- 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 for blowing air.
- the rear face of the front portion 4 is of concave shape matching the convex shape of the front face of the rear portion 5.
- the rear face of the front portion 4 and the front face of the rear part 5 are flat and oblique (cf. figure 8 ).
- 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 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 rounded.
- 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, 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 there is a tension of the paper web between the cylinders of the successive printing units, but more accentuated in the transverse direction of the paper web (see figure 4 ).
- the figure 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 L0 has, after passing through the first printing unit G1, a width L10 greater than the width L0, 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 L0.
- 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 vertically raising or lowering the tube. 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 (at 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.
- the deflector of the compensation device according to the invention has many advantages, in particular:
- the compressed air consumption of the compensation device according to the invention is reduced compared to 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 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 printing 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.
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- 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)
- Rotary Presses (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Handling Of Sheets (AREA)
- Character Spaces And Line Spaces In Printers (AREA)
Abstract
Description
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.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.
Pour contrer ou limiter ce phénomène de "fan-out", divers systèmes sont actuellement utilisés.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 pulsé 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 pulsé engendre une consommation importante d'air comprimé et est particulièrement bruyante en raison des échappements d'air saccadés.In order to avoid the traces left by the rollers, forced-air systems are used by means of nozzles or nozzles installed in place of the rollers previously described, making it possible to deform the printable medium 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 forced air devices generates a significant consumption of compressed air and is particularly noisy due to jerky air exhaust.
Le document
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 unprinted 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 l'arrière 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 print 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 :
- 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.
- 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.
- 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.
- 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.
- la partie arrière du déflecteur présente des flans longitudinaux arrondis.
- 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.
- 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.
- les déflecteurs sont stationnaires, et peuvent être fixés sur des poutres transversales situées à proximité du plan de défilement du support d'impression.
- the blowing chamber is formed, transversely to the axis of travel of the printing medium, of two approximately parallel walls (or slightly diverging from each other in the direction of the printing medium), oriented in direction of the rear of the deflector in the direction of scrolling 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.
- the deflector is formed in the direction of travel of the printing medium, 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; (eg 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 portion of the deflector has an increasing thickness in the direction of travel of the print medium, and the rear portion has a thickness greater than the front portion and comprises from front to rear an oblique or rounded leading edge 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.
- 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 baffle has rounded longitudinal blanks.
- the air blast chamber advantageously has a central position in the deflector; 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. 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.
- the deflectors are stationary, and can be fixed to transverse beams located near the printing medium scrolling plane.
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 :
- La
figure 1 est une vue en coupe longitudinale du déflecteur d'un dispositif de compensation selon une première variante de l'invention. - La
figure 2 est une vue en coupe transversale selon AA du déflecteur de lafigure 1 . - La
figure 3 est une vue en coupe longitudinale du déflecteur selon lafigure 1 en présence du support d'impression. - La
figure 4 est une vue avant du déflecteur de lafigure 3 . - La
figure 5 est une vue en perspective partielle d'un déflecteur du dispositif de compensation selon l'invention. - La
figure 6 est une vue en perspective d'un déflecteur du dispositif de compensation selon l'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. - 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.
- The
figure 1 is a longitudinal sectional view of the deflector of a compensation device according to a first variant of the invention. - The
figure 2 is a cross-sectional view along AA of the deflector of thefigure 1 . - The
figure 3 is a longitudinal sectional view of the deflector according to thefigure 1 in the presence of the print medium. - The
figure 4 is a front view of the deflector of thefigure 3 . - The
figure 5 is a partial perspective view of a deflector of the compensation device according to the invention. - The
figure 6 is a perspective view of a deflector of the compensation device according to the invention. - The
figure 7 is a diagram illustrating the positioning and the action of the compensation device in a printing machine according to the invention. - The
figure 8 is a longitudinal sectional view of the deflector of a compensation device according to a second variant of the invention, in the presence of the printing 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
Le dispositif de compensation comprend ici une paire de déflecteurs 2 stationnaires. En référence aux
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.
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
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
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.The
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
Selon un autre mode de réalisation, représenté en pointillés sur les
Ces formes biseautée ou arrondie permettent au flux d'air aval 20 (représenté sur les
Entre la partie avant 4 et la partie arrière 5 du déflecteur, sont positionnées des pièces 15, appelées cales, visibles sur la
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
Comme visible sur les
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.Thanks to the air cushion formed by the outgoing air space, in the upper part of the
La
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 L0. 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
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 = L0, 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
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
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
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
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
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
La consommation en air comprimé du dispositif de compensation, selon l'invention, est réduite par rapport au dispositif à air pulsé 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 to 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
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.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
Claims (11)
- Device for compensation of the variation in width of a flexible printing substrate (1), especially in the form of a sheet or strip, scrolling, in particular in a multicolour printing machine, between generally rotary printing means organised in the form of successive printing units (G1, G2, G3, G4) by means of a flow of air directed towards the printing substrate (1) with a view to modifying its flatness,
characterised in that it includes at least one pair of deflectors (2, 2a, 2a, 2c) arranged symmetrically on either side of the scrolling axis (X) of the printing substrate (1), each deflector including an air-blowing chamber (6) opening at the surface of the deflector facing towards the printing substrate (1) and being oriented in the direction of the rear deflector in the direction of movement (D) of said substrate in such a way as to produce a flow of air in the form of an air film with a view to facilitating, in parallel, the separation of said substrate from the surface of the deflector and the accompaniment of the driving in displacement of said printing substrate (1). - Device according to Claim 1, characterised in that the blowing chamber (6) is formed, transverse to the scrolling axis (X) of the printing substrate (1), from two approximately parallel walls oriented in the direction of the rear of the deflector (2) in the direction of movement (D) of said substrate, the two walls being either one concave upstream, the other convex downstream, or both plane and oblique.
- Device according to Claim 1 or 2, characterised in that the deflector (2, 2a, 2a, 2c) is formed, in the direction of movement (D) of the printing substrate (1), from a front portion (4) and from a rear portion (5) mounted on a bearing plate (3), the rear face of the front portion (4) and the front face of the rear portion (5) forming the walls of the blowing chamber (6).
- Device according to Claim 3, characterised in that the rear portion (5) of the deflector and the bearing plate (3) form a single part.
- Device according to Claim 3 or 4, characterised in that the front portion (4) of the deflector (2, 2a, 2a, 2c) exhibits a thickness increasing in the direction of scrolling (D) of the printing substrate (1), and in that the rear portion (5) exhibits a greater thickness than the front portion (4) and includes, from the front towards the rear, a rounded leading edge (10) and a plane surface (11) approximately parallel to the scrolling plane of the printing substrate (1).
- Device according to any one of the preceding claims, characterised in that the rear face (13; 13a) of the deflector (2, 2a, 2a, 2c) is bevelled or rounded, the surface facing towards the printing substrate (1) protruding from the surface in contact with the bearing plate (3), perpendicular to the movement plane of said substrate.
- Device according to any one of Claims 3 to 6, characterised in that the rear portion (5) of the deflector (2, 2a, 2a, 2c) exhibits rounded longitudinal flanks (12).
- Device according to any one of Claims 2 to 7, characterised in that the blowing chamber (6) includes, in addition, longitudinal walls formed by joined-on parts in order also to constitute pads (15) for adjustment of the spacing of the transverse walls from one another.
- Device according to any one of the preceding claims, characterised in that the deflectors (2, 2a, 2a, 2c) are stationary.
- Printing machine of the type with offset printing, characterised in that it includes at least one device for compensation of the variation in width of the printing substrate (1) according to any one of Claims 1 to 9, arranged downstream of the at least one printing unit (G1, G2, G3, G4) in such a way as to deform the printing substrate (1) locally with a view to compensating the enlargement of the width of said substrate occurring in the course of its printing.
- Printing machine of the type with printing by photogravure or by flexography, characterised in that it includes at least one device for compensation of the variation in width of the printing substrate (1) according to any one of Claims 1 to 9, arranged upstream of the at least one printing unit (G1, G2, G3, G4) in such a way as to deform the printing substrate locally with a view to anticipating and compensating the narrowing of the width of said substrate occurring, especially during its drying, downstream of the printing unit (G1, G2, G3, G4).
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 EP2059393A1 (en) | 2009-05-20 |
EP2059393B1 true EP2059393B1 (en) | 2010-01-06 |
Family
ID=37719434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 |
Country Status (8)
Country | Link |
---|---|
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) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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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 |
EP3256323B1 (en) | 2015-02-12 | 2020-04-15 | Bobst Mex Sa | Web holding and stabilizing unit for printhead and printer equipped therewith |
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)
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 |
ES2172819T3 (en) | 1996-10-25 | 2002-10-01 | Koenig & Bauer Ag | SYSTEM TO CORRECT THE EFFECT OF DIVERGENCE IN A CONTINUOUS FEED ROTARY. |
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 |
US6936137B2 (en) * | 2001-10-24 | 2005-08-30 | Honeywell International Inc. | Air clamp stabilizer for continuous web materials |
-
2006
- 2006-09-04 FR FR0607714A patent/FR2905302B1/en not_active Expired - Fee Related
-
2007
- 2007-08-29 DE DE602007004232T patent/DE602007004232D1/en active Active
- 2007-08-29 ES ES07823457T patent/ES2340969T3/en active Active
- 2007-08-29 EP EP07823457A patent/EP2059393B1/en not_active Not-in-force
- 2007-08-29 WO PCT/FR2007/001412 patent/WO2008029013A1/en active Application Filing
- 2007-08-29 PL PL07823457T patent/PL2059393T3/en unknown
- 2007-08-29 AT AT07823457T patent/ATE454266T1/en not_active IP Right Cessation
- 2007-08-29 US US12/439,737 patent/US8313260B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
FR2905302A1 (en) | 2008-03-07 |
ES2340969T3 (en) | 2010-06-11 |
US8313260B2 (en) | 2012-11-20 |
PL2059393T3 (en) | 2010-08-31 |
ATE454266T1 (en) | 2010-01-15 |
FR2905302B1 (en) | 2008-11-07 |
US20100054840A1 (en) | 2010-03-04 |
WO2008029013A1 (en) | 2008-03-13 |
EP2059393A1 (en) | 2009-05-20 |
DE602007004232D1 (en) | 2010-02-25 |
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