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WO1994020299A1 - Device for the adjustment of a flexographic printing machine unit - Google Patents

Device for the adjustment of a flexographic printing machine unit Download PDF

Info

Publication number
WO1994020299A1
WO1994020299A1 PCT/FR1994/000248 FR9400248W WO9420299A1 WO 1994020299 A1 WO1994020299 A1 WO 1994020299A1 FR 9400248 W FR9400248 W FR 9400248W WO 9420299 A1 WO9420299 A1 WO 9420299A1
Authority
WO
WIPO (PCT)
Prior art keywords
roller
strip
points
paper
plate
Prior art date
Application number
PCT/FR1994/000248
Other languages
French (fr)
Inventor
Bernard Depond
Original Assignee
Seroma
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 Seroma filed Critical Seroma
Priority to AU62104/94A priority Critical patent/AU6210494A/en
Priority to EP94909157A priority patent/EP0706456A1/en
Priority to CA002164640A priority patent/CA2164640A1/en
Publication of WO1994020299A1 publication Critical patent/WO1994020299A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F13/00Common details of rotary presses or machines
    • B41F13/02Conveying or guiding webs through presses or machines
    • B41F13/025Registering devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F13/00Common details of rotary presses or machines
    • B41F13/08Cylinders
    • B41F13/24Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/26Arrangement of cylinder bearings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F5/00Rotary letterpress machines
    • B41F5/24Rotary letterpress machines for flexographic printing

Definitions

  • the subject of the present invention is a device for adjusting the contact pressure between an inked plate roller and a movable strip of paper in line with a pressure roller in a flexographic printing machine.
  • Flexographic printing machines generally comprise a plurality of successive printing groups, identical in their arrangement and in their operation, the printing plate and the ink color being only modified from one group to another.
  • a strip of paper passes through each of the groups successively.
  • Each group is made up of:
  • - Inking means comprising an inkwell containing the liquid ink, a first bubbling roller which agitates the ink and a second ink roller known as "anilox".
  • - Printing means proper which comprise a plate-carrying roller on which is placed the plate which reproduces the pattern to be printed.
  • This cliché roller is movable in vertical translation to come into contact with the anilox along a generator, which causes the cliché to be inked. This adjustment is very delicate because the two rollers placed too close cause too much ink deposition, the two rollers arranged too far apart lead to ink defects.
  • - means for guiding the paper strip comprising at least one input roller, one pressure roller, one tension roller and one output roller so that the four rollers are arranged at the vertices of a substantially rectangular quadrilateral, so preferential.
  • the pressure roller is designed to receive the plate roller in support in order to deposit the ink following the pattern of the plate on the paper strip and the middle tension roller has a complementary guiding role.
  • English patent GB-A-817,472 describes a printing unit in which there is a strip of paper plated on a tension roller mounted at the end of an arm movable in rotation about an axis disposed at the other end of this arm.
  • the plate roller is also carried by the end of a movable arm rotating at its other end.
  • the transfer key on the paper is thus adjustable.
  • the ink take-up key As for the ink take-up key, it is adjusted by means of a set of two rollers, the first intermediate roller being fixed in translation and in contact with the printing plate roller and the second water roller being adjustable and immersed in the inkwell which thus ensures the transfer of an ink film of adjustable thickness on the first intermediate roller.
  • the present invention provides an adjustment device which overcomes the drawbacks of the prior art, which allows very precise adjustments of the keys on each of the groups during operation while retaining the timing of the different groups with respect to the strip, which is simple which makes it reliable and leads to a low cost price and which is adaptable to certain existing machines.
  • the device for adjusting a group of a flexographic printing machine which comprises at least two, according to the invention, each group comprising a continuous strip of paper, ten ⁇ due, circulating successively in each of the grou ⁇ pes, inking means with an inkwell, an ink roller, printing means with at least one movable plate roller in vertical translation intended to cooperate by contact with the ink roller, means guiding the strip of paper to be printed with at least one upstream tension roller, a pressure roller, a middle tension roller and a downstream tension roller, defining an upstream strand and a downstream strand, a first point of tangency between the upstream strand and the upstream tension roller, a second point of tangency between this upstream strand and the pressure roller, a third point of tangency between the middle tension roller and the downstream strand, and a fourth point of tangency between the downstream strand and the roller downstream tensioner, the pressure roller being pre ⁇ seen to cooperate with the plate-carrying roller and mounted on a mov
  • the axis of rotation of the pressure roller is mounted movable in trans ⁇ lation along a straight line parallel to the right joining the axes of the two tensioning rollers.
  • the single tensioning wheel is replaced by two rollers integral with a bar giving them a constant gap, this bar being movable in translation following a straight line parallel to the right joining the axes of the two tension rollers.
  • FIG. 1 shows a schematic view in side elevation of a group A, in line full and part of a group B associated, in continuous line, of a flexography machine with the device for adjusting the contact pressure according to the invention
  • FIG. 2 represents a partial perspective view of an embodiment of the device for adjusting the contact pressure according to the invention mounted on a group such as group A in FIG. 1,
  • FIG. 3 represents a simplified view of the kinematics of the device for adjusting the contact pressure
  • FIG. 4 shows a simplified view of the kinematics of the contact pressure adjustment device for an alternative embodiment with a pressure roller, eliminating the middle tension roller.
  • FIG. 1 two groups 10A and 10B are shown of a flexographic printing machine as well as means 12 for feeding the paper strip 13.
  • the machine comprises a solid chassis 14 preventing any deformation, on which the groups A, B and others are mounted.
  • Each group includes:
  • upstream tensioning roller 32 with an upstream tensioning roller 32, a pressing roller 34, a middle tensioning roller 36 and a downstream tensioning roller 38, defining two portions of strip called upstream strand 40 and downstream strand 42, a first, a second, a third and a fourth point of tangency respectively 44, 46, 48 and 50, disposed respectively between the upstream tension roller and the upstream strand, between the upstream strand and the pressure roller, between the median tension roller and the downstream strand, between the downstream strand and the downstream tension roller, and
  • drying means 52 shown in the form of a column type dryer 54 through which the strip of paper 13 passes.
  • the plate roller 28 is mounted movable in vertical translation by means of height adjustment 56 which comprise a screw-nut system 58, the translation taking place in the direction of the double arrow 60.
  • the support roller support shaft 62 is rotatably mounted and driven by a lateral pinion, not shown for clarity of the drawing, integral with this shaft 62 which meshes with a lateral pinion also not shown, integral with the shaft 64 of the ink roller 20.
  • the two ink rollers and plate holder are linked in rotation.
  • a common electric motor, with variable speed drive, meshes by its pinion integral with its drive shaft with the lateral pinions of the two ink roller and plate holder so as to be able to adjust the positioning of the rollers and their vi ⁇ rotation tesse, as will be useful for the implementation of the machine, described later ⁇ ment.
  • the height adjustment means 56 are integral with a beam 66 movable in translation along the double arrow 68 by means of displacement in translation 70 which also include a screw-nut system 72. This system essentially allows the beam to take two extreme positions front and rear.
  • any movement of the beam causes the simultaneous de ⁇ placement of the plate roller 28.
  • the tensioning rollers 32 and 38 are mounted in rotation relative to the frame and fixed in translation for a given arrangement of the pressure rollers 34 and middle tensioner 36.
  • the pressure rollers 34 and middle tensioner 36 are rotatably mounted and are integral with a carriage 74 movable in translation relative to the beam 66, along the double arrow 75 by means of displacement in translation 76 which comprise a screw system. nut 78.
  • group A The implementation of group A is now described in order to show the advantages which the solution according to the present invention provides.
  • the strip of paper 13 being in circulation, it passes under the upstream tension roller 32, on the presser water 34, on the middle tension roller 36, through the dryer 54 then under the downstream tension roller 38 before entering group B.
  • the paper strip is adjusted in tension, the plate roller 28 carries the sleeve with its plate and it is arranged above the paper strip and above the ink roller 20, the beam being in the front position.
  • the contact pressure of the plate roller 18 on the ink roller 20 is adjusted using the translation means 56, more particularly using the screw-nut system 58.
  • the paper strip 13 is in the immediate vicinity of the key holder roller. It is then necessary to adjust the key of the paper strip on the printing plate roller, then the initial setting of the strip is adjusted.
  • the curve ⁇ is the circle which has for its center the point of tangency 44 which passes through 46A and this circle passes through the point 47A of tangency of the strip of paper with the printing roller, but also by the point 47B of tangency of the paper strip with the plate roller.
  • the two points 46 and 48 are arranged outside the perpendicular lines 41, 43 to the right 45 joining the centers of the two tension rollers and passing through the first and fourth points of tangency 44 and 50.
  • the decrease in length of the strand 40 is offset by the increase in length of the strand 42.
  • this adjustment can be made for one of the groups without adjusting the machine.
  • a change of strip or a resumption of service with change of the plate-carrying roller is effected with durations considerably reduced compared to the devices of the prior art.
  • Variations in paper quality from the same spool can be taken into account, in particular variations in tension between the lead and the core of the spool.
  • the carriage movable in translation and the two rollers is replaced by a single roller 80 mounted for rotation on an arm 82 pivoting around a point 84 disposed on the right joining the axes of the two tension rollers, in the middle.
  • the compensation effects are identical.
  • Another advantage of the device of the invention flows from its arrangement and appears when one wishes to temporarily interrupt printing or when one is obliged to do so. Indeed, the operator, by maneuvering means for translational movement 70, moves the beam 66 back to the rear position.
  • the plate roller 28 always meshes with the pinion of the ink roller thanks to the length of the pinion teeth, because the displacement is very small but sufficient for the plate roller to no longer be in contact with the roller ink, which prevents fouling.
  • the plate roller is in contact with the paper strip, which allows the removal of all the ink from the plate roller on this strip, which suffices to allow it to scroll for a few moments.
  • screw-nut systems can be replaced by electric jacks with micrometric advance or by any other equivalent means such as hydraulic or pneumatic jacks.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)

Abstract

Device for the adjustment of a unit in a flexographic printing machine which includes at least two. Each unit includes a continuous tensioned paper web (13) moving successively through each of the units, ink means (16) with an ink fountain (22), an inking roller (20), printing means (26) with at least one co-operating plate holder roller (28) movable in vertical translation and designed to be in contact with the inking roller (20), means (30) for guiding the paper web to be printed. The device is characterized in that the first (44) and fourth tangent points are stationary, the second (46) and third (48) points are always simultaneously disposed within or without the two straight lines (41, 43) perpendicular to the straight line (45) joining the first (44) and fourth (50) points and passing by the first (44) and fourth (50) points so as to maintain constant the web length between the tensioning rollers (36, 38) and an almost identical setting of the plate in relation to the paper web (13).

Description

DISPOSITIF DE REGLAGE D'UN GROUPE D'UNE MACHINE D'IMPRESSION FLEXOGRAPHJQDEDEVICE FOR ADJUSTING A GROUP OF A FLEXOGRAPHJQDE PRINTING MACHINE
La présente invention a pour objet un dispositif de réglage de la pression de contact entre un rouleau porte-cliché encré et une bande de papier mobile au droit d'un rouleau presseur dans une machine d'im- pression flexographique.The subject of the present invention is a device for adjusting the contact pressure between an inked plate roller and a movable strip of paper in line with a pressure roller in a flexographic printing machine.
Les machines d'impression flexographique comprennent généralement une pluralité de groupes d'impression successifs, identiques dans leur agencement et dans leur fonctionnement, le cliché et la couleur d'encre étant seuls modifiés d'un groupe à l'autre.Flexographic printing machines generally comprise a plurality of successive printing groups, identical in their arrangement and in their operation, the printing plate and the ink color being only modified from one group to another.
Une bande de papier passe à travers chacun des grou¬ pes successivement. Chaque groupe est composé de façon connue de :A strip of paper passes through each of the groups successively. Each group is made up of:
- moyens d'encrage comportant un encrier contenant l'encre liquide, un premier rouleau barboteur qui agite l'encre et un second rouleau encreur dit, "a- nilox" .- Inking means comprising an inkwell containing the liquid ink, a first bubbling roller which agitates the ink and a second ink roller known as "anilox".
- moyens d'impression proprement dite qui comportent un rouleau porte-cliché sur lequel est disposé le cliché qui reproduit le motif à imprimer. Ce rouleau porte-cliché est mobile en translation verticale pour venir au contact de l'anilox le long d'une gé¬ nératrice, ce qui provoque l'encrage du cliché. Ce réglage est très délicat car les deux rouleaux disposés trop proches provoquent un dépôt d'encre trop important, les deux rouleaux disposés trop éloignés conduisent à des défauts d'encrage.- Printing means proper which comprise a plate-carrying roller on which is placed the plate which reproduces the pattern to be printed. This cliché roller is movable in vertical translation to come into contact with the anilox along a generator, which causes the cliché to be inked. This adjustment is very delicate because the two rollers placed too close cause too much ink deposition, the two rollers arranged too far apart lead to ink defects.
- moyens de guidage de la bande de papier comprenant au moins un rouleau d'entrée, un rouleau presseur, un rouleau tendeur et un rouleau de sortie de telle sorte que les quatre rouleaux soient disposés aux sommets d'un quadrilatère sensiblement rectangle, de façon préférentielle. Le rouleau presseur est prévu pour recevoir en appui le rouleau porte-cliché afin de procéder au dépôt de l'encre suivant le motif du cliché sur la bande de papier et le rouleau tendeur médian a un rôle de guidage complémentaire.- means for guiding the paper strip comprising at least one input roller, one pressure roller, one tension roller and one output roller so that the four rollers are arranged at the vertices of a substantially rectangular quadrilateral, so preferential. The pressure roller is designed to receive the plate roller in support in order to deposit the ink following the pattern of the plate on the paper strip and the middle tension roller has a complementary guiding role.
- moyens de séchage de l'encre ainsi déposée sur la bande de papier avant l'entrée dans un nouveau grou¬ pe.- means for drying the ink thus deposited on the paper strip before entering a new group.
Le réglage de la pression d'application du rouleau porte-cliché sur le rouleau encreur et sur la bande de papier passant sur le rouleau presseur est un problème important car seul le rouleau porte-cliché est mobile verticalement et cet unique degré de li¬ berté doit permettre le réglage de deux pressions d'application simultanément. Ces pressions d'application sont également appelées •'touches" dans le domaine de l'impression.The adjustment of the application pressure of the plate roller on the ink roller and on the paper strip passing over the pressure roller is an important problem because only the plate roller is vertically movable and this unique degree of freedom must allow the adjustment of two application pressures simultaneously. These application pressures are also called "keys" in the printing field.
De plus, une fois ces pressions d'applications ré¬ glées, on sait qu'au cours du fonctionnement, cer¬ tains paramètres vont varier comme le degré hygromé¬ trique du papier ou la montée d'encre, ce qui néces- site des ajustements très précis de ces pressions d'application.In addition, once these application pressures have been set, it is known that during operation, certain parameters will vary, such as the humidity of the paper or the rise in ink, which requires very precise adjustments of these application pressures.
Une solution consisterait à rendre également régla¬ ble le rouleau presseur mais une autre contrainte intervient, due au calage de la bande de papier. En effet, la bande de papier défile à travers les groupes d'impression et il est impératif de les syn¬ chroniser les uns par rapport aux autres afin que les différentes couleurs et les différents motifs soient déposés successivement et parfaitement calés par rapport au motif premier qui a été imprimé.One solution would be to also make adjustable the pressure roller but another constraint occurs, due to the timing of the paper strip. Indeed, the strip of paper scrolls through the printing units and it is imperative to synchronize them with respect to each other so that the different colors and the different patterns are deposited successively and perfectly aligned with respect to the primary pattern that was printed.
Pour assurer cette synchronisation, on agit sur le variateur de vitesse du moteur d'entraînement du rouleau encreur qui entraîne de façon connue le rou¬ leau porte-cliché par un ensemble d'engrenages. Plusieurs solutions ont été proposées, notamment un article "Papier und Kunststoff-Verarbeiter Interna¬ tional" Numéro 2, Décembre 1987, page 28-33, qui propose un réglage en translation verticale du rou- leau porte-cliché et un réglage en translation hori¬ zontale du rouleau encreur.To ensure this synchronization, action is taken on the speed variator of the drive motor of the ink roller which drives, in known manner, the plate-carrying water by a set of gears. Several solutions have been proposed, in particular an article "Papier und Kunststoff-Verarbeiter Interna¬ tional" Number 2, December 1987, page 28-33, which proposes an adjustment in vertical translation of the plate roller and an adjustment in horizontal translation. ¬ zale of the ink roller.
Cette solution permet de régler l'un des paramètres, c'est-à-dire la prise d'encre par le porte-cliché mais elle ne résout pas le problème du réglage du report d'encre sur la bande de papier.This solution makes it possible to adjust one of the parameters, that is to say the ink intake by the plate holder, but it does not solve the problem of adjusting the ink transfer on the paper strip.
Or, on sait que l'opérateur règle d'abord la touche de prise d'encre du porte-cliché et ensuite la tou¬ che de report sur la bande de papier. Le brevet anglais GB-A-817 472 décrit un groupe d'impression dans lequel on dispose une bande de papier plaquée sur un rouleau tendeur monté à l'ex¬ trémité d'un bras mobile en rotation autour d'un axe disposé à l'autre extrémité de ce bras. Le rouleau porte-cliché est également porté par l'extrémité d'un bras mobile en rotation à son autre extrémité.However, we know that the operator first sets the ink take-up key on the plate holder and then the transfer key on the paper strip. English patent GB-A-817,472 describes a printing unit in which there is a strip of paper plated on a tension roller mounted at the end of an arm movable in rotation about an axis disposed at the other end of this arm. The plate roller is also carried by the end of a movable arm rotating at its other end.
La touche de report sur le papier est ainsi régla¬ ble.The transfer key on the paper is thus adjustable.
Quant à la touche de prise d'encre, elle est ajustée grâce à un ensemble de deux rouleaux, le premier rouleau intermédiaire étant fixe en translation et au contact du rouleau porte-cliché et le second rou¬ leau étant réglable et baignant dans l'encrier ce qui assure ainsi le report d'un film d'encre d'épaisseur réglable sur le premier rouleau intermé¬ diaire.As for the ink take-up key, it is adjusted by means of a set of two rollers, the first intermediate roller being fixed in translation and in contact with the printing plate roller and the second water roller being adjustable and immersed in the inkwell which thus ensures the transfer of an ink film of adjustable thickness on the first intermediate roller.
Un tel agencement est inadapté pour des applications aux machines d'impression flexographique actuelles à plusieurs groupes d'impression successifs car le calage n'est pas pris en compte, seul le réglage des différents rouleaux les uns par rapport aux autres dans un même groupe est envisagé.Such an arrangement is unsuitable for applications to current flexographic printing machines with several successive printing groups because the setting is not taken into account, only the adjustment of the different rolls relative to each other in the same group is envisaged.
La présente invention propose un dispositif de ré¬ glage qui pallie les inconvénients de l'art anté- rieur, qui permet des ajustements très précis des touches sur chacun des groupes en cours de fonc¬ tionnement en conservant le calage des différents groupes par rapport à la bande, qui est simple ce qui le rend fiable et conduit à un prix de revient peu élevé et qui est adaptable sur certains machines existantes.The present invention provides an adjustment device which overcomes the drawbacks of the prior art, which allows very precise adjustments of the keys on each of the groups during operation while retaining the timing of the different groups with respect to the strip, which is simple which makes it reliable and leads to a low cost price and which is adaptable to certain existing machines.
A cet effet, le dispositif de réglage d'un groupe d'une machine d'impression flexographique qui en comprend au moins deux, selon l'invention, chaque groupe comportant une bande de papier continue, ten¬ due, circulant successivement dans chacun des grou¬ pes, des moyens d'encrage avec un encrier, un rou¬ leau encreur, des moyens d'impression avec au moins un rouleau porte-cliché mobile en translation verti- cale prévu pour coopérer par contact avec le rouleau encreur, des moyens de guidage de la bande de papier à imprimer avec au moins un rouleau tendeur amont, un rouleau presseur, un rouleau tendeur médian et un rouleau tendeur aval, définissant un brin amont et un brin aval, un premier point de tangence entre le brin amont et le rouleau tendeur amont, un deuxième point de tangence entre ce brin amont et le rouleau presseur, un troisième point de tangence entre le rouleau tendeur médian et le brin aval, et un qua- trième point de tangence entre le brin aval et le rouleau tendeur aval, le rouleau presseur étant pré¬ vu pour coopérer avec le rouleau porte-cliché et monté sur un support mobile équipé de moyens de dé¬ placement en translation suivant une droite ou une courbe de façon à régler l'écart entre la bande de papier plaquée sur le rouleau et le cliché du rou¬ leau porte-cliché, se caractérise en ce que les pre¬ mier et quatrième points de tangence étant fixes, les deuxième et troisième points sont toujours dis- posés simultanément à l'intérieur ou simultanément à l'extérieur des deux droites perpendiculaires à la droite joignant ces premier et quatrième points et passant par ces premier et quatrième points de façon à conserver constante la longueur de bande entre les rouleaux tendeur et un calage quasi-identique du cliché par rapport à la bande de papier. Selon un mode de réalisation de l'invention, le sup¬ port du rouleau presseur est un bras dont l'axe de rotation est situé sensiblement au milieu du segment joignant les axes de rotation des deux rouleaux ten¬ deur.To this end, the device for adjusting a group of a flexographic printing machine which comprises at least two, according to the invention, each group comprising a continuous strip of paper, ten¬ due, circulating successively in each of the grou¬ pes, inking means with an inkwell, an ink roller, printing means with at least one movable plate roller in vertical translation intended to cooperate by contact with the ink roller, means guiding the strip of paper to be printed with at least one upstream tension roller, a pressure roller, a middle tension roller and a downstream tension roller, defining an upstream strand and a downstream strand, a first point of tangency between the upstream strand and the upstream tension roller, a second point of tangency between this upstream strand and the pressure roller, a third point of tangency between the middle tension roller and the downstream strand, and a fourth point of tangency between the downstream strand and the roller downstream tensioner, the pressure roller being pre¬ seen to cooperate with the plate-carrying roller and mounted on a movable support equipped with means of displacement in translation along a straight line or a curve so as to adjust the distance between the strip of paper coated on the roller and the cliché of the cliché roll, is characterized in that the first and fourth points of tangency being fixed, the second and third points are always arranged simultaneously inside or simultaneously outside the two straight lines perpendicular to the right joining these first and fourth points and passing through these first and fourth points so as to keep constant the length of strip between the tension rollers and an almost identical setting of the plate with respect to the strip of paper. According to one embodiment of the invention, the sup¬ port of the pressure roller is an arm whose axis of rotation is located substantially in the middle of the segment joining the axes of rotation of the two ten¬ deur rollers.
Selon un autre mode de réalisation, l'axe de rota¬ tion du rouleau presseur est monté mobile en trans¬ lation suivant une droite parallèle à la droite joi- gnant les axes des deux rouleaux tendeur.According to another embodiment, the axis of rotation of the pressure roller is mounted movable in trans¬ lation along a straight line parallel to the right joining the axes of the two tensioning rollers.
Selon un mode de réalisation préférentiel, le rou¬ leau tendeur unique est remplacé par deux rouleaux solidaires d'une barre leur conférant un écart cons¬ tant, cette barre étant mobile en translation sui- vant une droite parallèle à la droite joignant les axes des deux rouleaux tendeur.According to a preferred embodiment, the single tensioning wheel is replaced by two rollers integral with a bar giving them a constant gap, this bar being movable in translation following a straight line parallel to the right joining the axes of the two tension rollers.
La présente invention est décrite ci-après selon un mode de réalisation particulier et avec une varian¬ te, en regard des dessins annexés sur lesquels : - la figure 1 représente une vue schématique en élé¬ vation latérale d'un groupe A, en trait plein et d'une partie d'un groupe B associé, en trait discon¬ tinu, d'une machine de flexographie avec le disposi¬ tif de réglage de la pression de contact selon l'in- vention, - la figure 2 représente une vue partielle en pers¬ pective d'un mode de réalisation du dispositif de réglage de la pression de contact selon l'invention monté sur un groupe tel que le groupe A de la figure 1,The present invention is described below according to a particular embodiment and with a varian¬ te, with reference to the accompanying drawings in which: - Figure 1 shows a schematic view in side elevation of a group A, in line full and part of a group B associated, in continuous line, of a flexography machine with the device for adjusting the contact pressure according to the invention, FIG. 2 represents a partial perspective view of an embodiment of the device for adjusting the contact pressure according to the invention mounted on a group such as group A in FIG. 1,
- la figure 3 représente une vue simplifiée de la cinématique du dispositif de réglage de la pression de contact, etFIG. 3 represents a simplified view of the kinematics of the device for adjusting the contact pressure, and
- la figure 4 représente une vue simplifiée de la cinématique du dispositif de réglage de la pression de contact pour une variante de réalisation avec un rouleau presseur, en supprimant le rouleau tendeur médian.- Figure 4 shows a simplified view of the kinematics of the contact pressure adjustment device for an alternative embodiment with a pressure roller, eliminating the middle tension roller.
Sur la figure 1 , on a représenté deux groupes 10A et 10B d'une machine d'impression flexographique ainsi que des moyens 12 d'alimentation en bande de papier 13.In FIG. 1, two groups 10A and 10B are shown of a flexographic printing machine as well as means 12 for feeding the paper strip 13.
Ces moyens d'alimentation sont connus et ne sont représentés que très partiellement. De la même façon, en sortie de machine, il est prévu des moyens complexes de mise en tension de la bande de papier ainsi que des moyens de réception de la bande de papier imprimé.These supply means are known and are only shown very partially. Similarly, on leaving the machine, there are provided complex means for tensioning the paper strip as well as means for receiving the printed paper strip.
Tous ces organes complémentaires ne font pas partie de la présente invention et ne sont donc pas dé¬ crits.All these complementary members are not part of the present invention and are therefore not described.
On admet qu'une bande de papier est mise en circula¬ tion avec une vitesse donnée et soumise à une ten¬ sion donnée, à travers les groupes A et B et autres puisque le nombre de groupes dépend du nombre de couleurs que comprend le motif à reproduire sur la bande de papier.We admit that a strip of paper is circulated with a given speed and subjected to a given tension, through groups A and B and others since the number of groups depends on the number of colors included in the pattern. to reproduce on the paper strip.
La machine comprend un châssis massif 14 évitant toute déformation, sur lequel sont montés les grou- pes A, B et autres. Chaque groupe comprend :The machine comprises a solid chassis 14 preventing any deformation, on which the groups A, B and others are mounted. Each group includes:
- des moyens d'encrage 16 avec un rouleau barboteur 18, un rouleau encreur 20 et un encrier 22 contenant de l'encre 24, - des moyens d'impression 26 comprenant un rouleau porte-cliché 28,inking means 16 with a bubbling roller 18, an ink roller 20 and an inkwell 22 containing ink 24, - printing means 26 comprising a plate roller 28,
- des moyens de guidage 30 avec un rouleau tendeur amont 32, un rouleau presseur 34, un rouleau tendeur médian 36 et un rouleau tendeur aval 38, définissant deux portions de bande dites brin amont 40 et brin aval 42, un premier, un deuxième, un troisième et un quatrième points de tangence respectivement 44, 46, 48 et 50, disposés respectivement entre le rouleau tendeur amont et le brin amont, entre le brin amont et le rouleau presseur, entre le rouleau tendeur médian et le brin aval, entre le brin aval et le rouleau tendeur aval, etguide means 30 with an upstream tensioning roller 32, a pressing roller 34, a middle tensioning roller 36 and a downstream tensioning roller 38, defining two portions of strip called upstream strand 40 and downstream strand 42, a first, a second, a third and a fourth point of tangency respectively 44, 46, 48 and 50, disposed respectively between the upstream tension roller and the upstream strand, between the upstream strand and the pressure roller, between the median tension roller and the downstream strand, between the downstream strand and the downstream tension roller, and
- des moyens de séchage 52 représentés sous forme d'un séchoir 54 du type colonne à travers lequel passe la bande de papier 13.drying means 52 shown in the form of a column type dryer 54 through which the strip of paper 13 passes.
Ainsi que cela est également représenté sur la fi¬ gure 2, le rouleau porte-cliché 28 est monté mobile en translation verticale grâce à des moyens de ré¬ glage en hauteur 56 qui comprennent un système vis- écrou 58, la translation s'effectuant selon le sens de la double flèche 60.As is also shown in FIG. 2, the plate roller 28 is mounted movable in vertical translation by means of height adjustment 56 which comprise a screw-nut system 58, the translation taking place in the direction of the double arrow 60.
L'arbre 62 de support du rouleau porte-cliché est monté à rotation et entraîné par un pignon latéral, non représenté pour la clarté du dessin , solidaire de cet arbre 62 qui engrène avec un pignon latéral également non représenté, solidaire de l'arbre 64 du rouleau encreur 20.The support roller support shaft 62 is rotatably mounted and driven by a lateral pinion, not shown for clarity of the drawing, integral with this shaft 62 which meshes with a lateral pinion also not shown, integral with the shaft 64 of the ink roller 20.
Les deux rouleaux encreur et porte-cliché sont liés en rotation. Un moteur électrique commun, à variateur de vitesse, engrène par son pignon solidaire de son arbre d'en¬ traînement avec les pignons latéraux des deux rou¬ leaux encreur et porte-cliché de façon à pouvoir régler le positionnement des rouleaux et leur vi¬ tesse de rotation, ainsi que cela sera utile pour la mise en oeuvre de la machine, décrite ultérieure¬ ment. Les moyens de réglage en hauteur 56 sont solidaires d'une poutre 66 mobile en translation suivant la double flèche 68 grâce à des moyens de déplacement en translation 70 qui comprennent également un sys¬ tème vis-écrou 72. Ce système permet essentiellement à la poutre de prendre deux positions extrêmes avant et arrière.The two ink rollers and plate holder are linked in rotation. A common electric motor, with variable speed drive, meshes by its pinion integral with its drive shaft with the lateral pinions of the two ink roller and plate holder so as to be able to adjust the positioning of the rollers and their vi¬ rotation tesse, as will be useful for the implementation of the machine, described later¬ ment. The height adjustment means 56 are integral with a beam 66 movable in translation along the double arrow 68 by means of displacement in translation 70 which also include a screw-nut system 72. This system essentially allows the beam to take two extreme positions front and rear.
Ainsi tout déplacement de la poutre provoque le dé¬ placement simultané du rouleau porte-cliché 28. Comme cela est représenté sur la figure 1, les rou¬ leaux tendeurs 32 et 38 sont montés en rotation par rapport au châssis et fixes en translation pour un agencement donné des rouleaux presseur 34 et tendeur médian 36.Thus any movement of the beam causes the simultaneous de¬ placement of the plate roller 28. As shown in Figure 1, the tensioning rollers 32 and 38 are mounted in rotation relative to the frame and fixed in translation for a given arrangement of the pressure rollers 34 and middle tensioner 36.
Les rouleaux presseur 34 et tendeur médian 36 sont montés à rotation et sont solidaires d'un chariot 74 mobile en translation par rapport à la poutre 66, suivant la double flèche 75 grâce à des moyens de déplacement en translation 76 qui comprennent un système vis-écrou 78. La mise en oeuvre du groupe A est maintenant décrite afin de faire apparaître les avantages que procure la solution selon la présente invention. La bande de papier 13 étant en circulation, elle passe sous le rouleau tendeur amont 32, sur le rou¬ leau presseur 34, sur le rouleau tendeur médian 36, à travers le séchoir 54 puis sous le rouleau tendeur aval 38 avant d'entrer dans le groupe B. La bande de papier est réglée en tension, le rouleau porte-cliché 28 porte le manchon avec son cliché et il est disposé au-dessus de la bande de papier et au dessus du rouleau encreur 20, la poutre étant en position avant.The pressure rollers 34 and middle tensioner 36 are rotatably mounted and are integral with a carriage 74 movable in translation relative to the beam 66, along the double arrow 75 by means of displacement in translation 76 which comprise a screw system. nut 78. The implementation of group A is now described in order to show the advantages which the solution according to the present invention provides. The strip of paper 13 being in circulation, it passes under the upstream tension roller 32, on the presser water 34, on the middle tension roller 36, through the dryer 54 then under the downstream tension roller 38 before entering group B. The paper strip is adjusted in tension, the plate roller 28 carries the sleeve with its plate and it is arranged above the paper strip and above the ink roller 20, the beam being in the front position.
La pression de contact du rouleau porte-cliché 18 sur le rouleau encreur 20 est réglée à l'aide des moyens de translation 56, plus particulièrement à l'aide du système vis-écrou 58.The contact pressure of the plate roller 18 on the ink roller 20 is adjusted using the translation means 56, more particularly using the screw-nut system 58.
Une fois la bonne touche réglée, la bande de papier 13 est à proximité immédiate du rouleau porte-cli¬ ché. II faut ensuite régler la touche de la bande de pa¬ pier sur le rouleau porte-cliché, puis on règle le calage initial de la bande.Once the correct key has been set, the paper strip 13 is in the immediate vicinity of the key holder roller. It is then necessary to adjust the key of the paper strip on the printing plate roller, then the initial setting of the strip is adjusted.
On agit donc sur le moteur électrique qui fait tour¬ ner le rouleau porte-cliché pour caler un repère du motif du rouleau porte-cliché avec un repère porté par la bande de papier. ainsi que cela a été vu précédemment, il est souvent nécessaire de régler la touche au cours du fonction¬ nement. L'opérateur agit sur les moyens de déplacement en translation 76 et plus particulièrement à l'aide du système vis-écrou 78, il approche ou recule le cha¬ riot par rapport à la poutre 66 de façon à ajuster la touche. C'est là qu'intervient l'agencement particulier de l'invention qui permet de compenser en maintenant le calage initial tout en autorisant cet ajustement de la touche, ce qui est maintenant expliqué à l'aide de la figure 3. Les rouleaux en trait plein correspondent à le posi¬ tion vers l'avant de ces rouleaux et en trait dis¬ continu à la position vers l'arrière.We therefore act on the electric motor which rotates the plate roller to wedge a mark on the pattern of the plate roll with a mark carried by the strip of paper. as has been seen previously, it is often necessary to adjust the key during operation. The operator acts on the means of displacement in translation 76 and more particularly with the aid of the screw-nut system 78, it approaches or moves back the cha¬ riot relative to the beam 66 so as to adjust the touch. This is where the particular arrangement of the invention comes into play, which makes it possible to compensate by maintaining the initial setting while allowing this adjustment of the key, which is now explained with the aid of FIG. 3. The rollers in solid line correspond to the forward position of these rollers and in continuous line to the rearward position.
On constate que pour un déplacement en translation d des rouleaux presseur et tendeur médian, le déplace¬ ment sur la bande de papier du point de tangence est négligeable.It can be seen that for a translational movement of the pressure and middle tension rollers, the displacement on the paper strip of the point of tangency is negligible.
En effet, la courbe Ç est le cercle qui a pour cen¬ tre le point de tangence 44 qui passe par 46A et ce cercle passe par le point 47A de tangence de la bande de papier avec le rouleau porte-cliché, mais aussi par le point 47B de tangence de la bande de papier avec le rouleau porte-cliché. Ceci est dû à la caractéristique du dispositif de réglage selon laquelle les deux points 46 et 48 sont disposés à l'extérieur des droites perpendiculaires 41, 43 à la droite 45 joignant les centres des deux rouleaux tendeur et passant par les premier et qua¬ trième points de tangence 44 et 50. Ainsi lorsque l'angle α, défini par le brin amont 40 et la première perpendiculaire 41, diminue, l'angle β , défini par le brin aval 42 et la seconde perpen¬ diculaire 43, augmente.In fact, the curve Ç is the circle which has for its center the point of tangency 44 which passes through 46A and this circle passes through the point 47A of tangency of the strip of paper with the printing roller, but also by the point 47B of tangency of the paper strip with the plate roller. This is due to the characteristic of the adjustment device according to which the two points 46 and 48 are arranged outside the perpendicular lines 41, 43 to the right 45 joining the centers of the two tension rollers and passing through the first and fourth points of tangency 44 and 50. Thus when the angle α, defined by the upstream strand 40 and the first perpendicular 41, decreases, the angle β, defined by the downstream strand 42 and the second perpen¬ dicular 43, increases.
De façon identique, la diminution de longueur du brin 40 est compensée par l'augmentation de longueur du brin 42.Similarly, the decrease in length of the strand 40 is offset by the increase in length of the strand 42.
Cette compensation est réalisée de façon identique si les deux points de tangence 46 et 48 sont simul¬ tanément entre les deux droites perpendiculaires 41 et 43 sur la plage de réglage envisagée.This compensation is carried out identically if the two tangent points 46 and 48 are simul¬ taneously between the two perpendicular lines 41 and 43 over the adjustment range envisaged.
On comprend dès lors que la touche de la bande de papier avec le porte-cliché peut être ajustée de façon très précise, ce qui est d'une importance ca¬ pitale puisqu'il influe directement sur la qualité de l'élément visible du travail d'impression flexo¬ graphique.It is therefore understandable that the touch of the paper strip with the plate holder can be adjusted very precisely, which is of crucial importance since it directly affects the quality of the visible element of the flexographic printing job.
De plus, cet ajustement peut être réalisé pour l'un des groupes sans dérégler la machine. Ainsi, un changement de bande ou une remise en ser¬ vice avec changement du rouleau porte-cliché est ef¬ fectué avec des durées considérablement diminuées par rapport aux dispositifs de l'art antérieur. Les variations de qualité de papier d'une même bo- bine peuvent être prises en compte, notamment les variations de tension entre l'entame et le coeur de la bobine.In addition, this adjustment can be made for one of the groups without adjusting the machine. Thus, a change of strip or a resumption of service with change of the plate-carrying roller is effected with durations considerably reduced compared to the devices of the prior art. Variations in paper quality from the same spool can be taken into account, in particular variations in tension between the lead and the core of the spool.
Selon une variante de l'invention, représentée sché- matiquement sur la figure 4, on remplace le chariot mobile en translation et les deux rouleaux par un rouleau unique 80 monté à rotation sur un bras 82 pivotant autour d'un point 84 disposé sur la droite joignant les axes des deux rouleaux tendeur, en son milieu. Les effets de compensation sont identiques.According to a variant of the invention, shown diagrammatically in FIG. 4, the carriage movable in translation and the two rollers is replaced by a single roller 80 mounted for rotation on an arm 82 pivoting around a point 84 disposed on the right joining the axes of the two tension rollers, in the middle. The compensation effects are identical.
Un autre avantage du dispositif de l'invention dé¬ coule de son agencement et apparait lorsque l'on souhaite interrompre momentanément l'impression ou que l'on y est obligé. En effet, l'opérateur, par manoeuvre des moyens de déplacement en translation 70, recule la poutre 66 en position arrière.Another advantage of the device of the invention flows from its arrangement and appears when one wishes to temporarily interrupt printing or when one is obliged to do so. Indeed, the operator, by maneuvering means for translational movement 70, moves the beam 66 back to the rear position.
Dans cette configuration, le rouleau porte-cliché 28 engrène toujours avec le pignon du rouleau encreur grâce à la longueur des dents des pignons, car le déplacement est très faible mais suffisant pour que le rouleau porte-cliché ne soit plus en contact avec le rouleau encreur, ce qui évite son encrassement. Par ailleurs, le rouleau porte-cliché est contact avec la bande de papier, ce qui permet la dépose de toute l'encre du rouleau porte-cliché sur cette bande qu'il suffit de laisser défiler durant quel¬ ques instants.In this configuration, the plate roller 28 always meshes with the pinion of the ink roller thanks to the length of the pinion teeth, because the displacement is very small but sufficient for the plate roller to no longer be in contact with the roller ink, which prevents fouling. In addition, the plate roller is in contact with the paper strip, which allows the removal of all the ink from the plate roller on this strip, which suffices to allow it to scroll for a few moments.
Dès la reprise, il suffit d'approcher la poutre 66 qui revient dans sa position initiale, le rouleau porte-cliché est calé sans qu'il y ait nécessité de réglages supplémentaires.Upon resumption, simply approach the beam 66 which returns to its initial position, the plate roller is chocked without the need for additional adjustments.
Tous les éléments décrits l'ont été pour un montage en vertical mais il en serait de même pour un agen- cernent en horizontal.All the elements described were for vertical mounting, but the same would be true for a horizontal arrangement.
Les constituants tels les systèmes vis-écrou pour¬ ront être remplacés par des vérins électriques à avancement micrométrique ou par tout autre moyen équivalent tel que des vérins hydrauliques ou pneu- matiques. The components such as screw-nut systems can be replaced by electric jacks with micrometric advance or by any other equivalent means such as hydraulic or pneumatic jacks.

Claims

REVENDICATIONS 1. Dispositif de réglage d'un groupe 10 d'une machine d'impression flexographique qui en comprend au moins deux, chaque groupe comportant une bande (13) de papier continue, tendue, circulant successi¬ vement dans chacun des groupes, des moyens d'encrage (16) avec un encrier (22) , un rouleau encreur (20) , des moyens d'impression (26) avec au moins un rou¬ leau porte-cliché (28) mobile en translation verti- cale prévu pour coopérer par contact avec le rouleau encreur, des moyens de guidage (30) de la bande de papier à imprimer avec au moins un rouleau tendeur amont (32) , un rouleau presseur (34, 80) et un rou¬ leau tendeur aval (38) , définissant un brin amont (40) et un brin aval (42) , un premier point de tan¬ gence (44) entre le rouleau tendeur amont (32) et le brin amont (40) , un deuxième point de tangence (46) entre ce brin amont (40) et le rouleau presseur (34) , un troisième point de tangence (48) entre le rouleau tendeur (34, 80) et le brin aval (42), et un quatrième point de tangence (50) entre le brin aval (42) et le rouleau tendeur aval (38) , le rouleau presseur (34, 80) étant prévu pour coopérer avec le rouleau porte-cliché (28) et monté sur un support mobile (66, 82) équipé de moyens de déplacement (66, 70) en translation suivant une droite ou une courbe de façon à régler l'écart entre la bande de papier plaquée sur le rouleau et le cliché du rouleau porte-cliché, caractérisé en ce que les premier et quatrième points de tangence (32, 50) étant fixes, les deuxième et troisième points (46, 48) sont tou¬ jours disposés simultanément à l'intérieur ou simul¬ tanément à l'extérieur des deux droites (41, 43) perpendiculaires à la droite joignant ces premier et quatrième points et passant par ces premier et qua- trième points de façon à conserver constante la lon¬ gueur de bande entre les rouleaux tendeur (32, 38) et un calage quasi-identique du cliché par rapport à la bande de papier. CLAIMS 1. Device for adjusting a group 10 of a flexographic printing machine which comprises at least two, each group comprising a strip (13) of continuous, stretched paper, circulating successively in each of the groups, inking means (16) with an inkwell (22), an inking roller (20), printing means (26) with at least one film holder roller (28) movable in vertical translation provided for cooperate by contact with the ink roller, guiding means (30) of the strip of paper to be printed with at least one upstream tension roller (32), a pressure roller (34, 80) and a downstream tensioner roller (38 ), defining an upstream strand (40) and a downstream strand (42), a first tangent point (44) between the upstream tension roller (32) and the upstream strand (40), a second tangent point (46 ) between this upstream strand (40) and the pressure roller (34), a third point of tangency (48) between the tension roller (34, 80) and the downstream strand (42 ), and a fourth point of tangency (50) between the downstream strand (42) and the downstream tensioning roller (38), the pressure roller (34, 80) being provided to cooperate with the plate roller (28) and mounted on a mobile support (66, 82) equipped with means of displacement (66, 70) in translation along a straight line or a curve so as to adjust the distance between the strip of paper pressed on the roll and the plate of the support roll plate, characterized in that the first and fourth points of tangency (32, 50) being fixed, the second and third points (46, 48) are always arranged simultaneously inside or simultaneously outside the two straight lines (41, 43) perpendicular to the straight line joining these first and fourth points and passing through these first and fourth third points so as to keep constant the length of strip between the tensioning rollers (32, 38) and an almost identical setting of the plate relative to the strip of paper.
2. Dispositif de réglage selon la revendica¬ tion 1, caractérisé en ce que le support du rouleau presseur unique (80) est un bras (82) dont l'axe de rotation est situé sensiblement au milieu du segment joignant les axes de rotation des deux rouleaux ten- deur (32, 38) .2. Adjusting device according to claim 1, characterized in that the support of the single pressing roller (80) is an arm (82) whose axis of rotation is located substantially in the middle of the segment joining the axes of rotation of the two tension rollers (32, 38).
3. Dispositif de réglage selon la revendica¬ tion 1, caractérisé en ce que l'axe de rotation du rouleau presseur (80) est monté mobile en transla- tion suivant une droite parallèle à la droite joi¬ gnant les axes des deux rouleaux tendeur.3. Adjusting device according to claim 1, characterized in that the axis of rotation of the pressure roller (80) is mounted movable in translation along a straight line parallel to the right joining the axes of the two tensioning rollers .
4. Dispositif de réglage selon l'une quelcon¬ que des revendications précédentes, caractérisé en ce que le rouleau tendeur unique (80) est remplacé par un rouleau presseur (34) et un rouleau tendeur médian (36) solidaires d'un chariot (74) leur confé¬ rant un écart constant, ce chariot étant mobile en translation suivant une droite parallèle à la droite joignant les axes des rouleaux tendeur (32, 38) . 4. Adjustment device according to any one of the preceding claims, characterized in that the single tension roller (80) is replaced by a pressure roller (34) and a middle tension roller (36) integral with a carriage ( 74) giving them a constant distance, this carriage being movable in translation along a straight line parallel to the right joining the axes of the tensioning rollers (32, 38).
PCT/FR1994/000248 1993-03-09 1994-03-07 Device for the adjustment of a flexographic printing machine unit WO1994020299A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU62104/94A AU6210494A (en) 1993-03-09 1994-03-07 Device for the adjustment of a flexographic printing machine unit
EP94909157A EP0706456A1 (en) 1993-03-09 1994-03-07 Device for the adjustment of a flexographic printing machine unit
CA002164640A CA2164640A1 (en) 1993-03-09 1994-03-07 Device for the adjustment of a flexographic printing machine unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9302969 1993-03-09
FR9302969A FR2705612A1 (en) 1993-03-09 1993-03-09 Printing group for flexographic machine.

Publications (1)

Publication Number Publication Date
WO1994020299A1 true WO1994020299A1 (en) 1994-09-15

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AU (1) AU6210494A (en)
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FR (1) FR2705612A1 (en)
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FR2759629A1 (en) * 1997-02-18 1998-08-21 Christian Rebeyrol FLEXOGRAPHIC PRINTING MACHINE
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WO2007104488A1 (en) * 2006-03-15 2007-09-20 Windmöller & Hölscher Kg Printing press and method for setting the position of its printing unit

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FR2759629A1 (en) * 1997-02-18 1998-08-21 Christian Rebeyrol FLEXOGRAPHIC PRINTING MACHINE
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WO2007104488A1 (en) * 2006-03-15 2007-09-20 Windmöller & Hölscher Kg Printing press and method for setting the position of its printing unit

Also Published As

Publication number Publication date
FR2705612A1 (en) 1994-12-02
AU6210494A (en) 1994-09-26
EP0706456A1 (en) 1996-04-17
CA2164640A1 (en) 1994-09-15

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