EP2139683A1 - Doctor blade system for a printing unit, intended for an intaglio printing machine - Google Patents

Doctor blade system for a printing unit, intended for an intaglio printing machine

Info

Publication number
EP2139683A1
EP2139683A1 EP08734819A EP08734819A EP2139683A1 EP 2139683 A1 EP2139683 A1 EP 2139683A1 EP 08734819 A EP08734819 A EP 08734819A EP 08734819 A EP08734819 A EP 08734819A EP 2139683 A1 EP2139683 A1 EP 2139683A1
Authority
EP
European Patent Office
Prior art keywords
blade
cylinder
peripheral surface
engraved cylinder
carrier hub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08734819A
Other languages
German (de)
French (fr)
Other versions
EP2139683B1 (en
Inventor
Pierre Robadey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bobst Mex SA
Original Assignee
Bobst SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bobst SA filed Critical Bobst SA
Priority to EP08734819A priority Critical patent/EP2139683B1/en
Publication of EP2139683A1 publication Critical patent/EP2139683A1/en
Application granted granted Critical
Publication of EP2139683B1 publication Critical patent/EP2139683B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/08—Wiping mechanisms
    • B41F9/10—Doctors, scrapers, or like devices
    • B41F9/1009—Doctors, scrapers, or like devices with reciprocating movement

Definitions

  • the present invention relates to a squeegee system, provided with a squeegee.
  • the invention also relates to a printing unit equipped with a doctor blade system.
  • the invention finally relates to a gravure printing machine, incorporating at least one printing unit.
  • Photogravure also called rotogravure
  • rotogravure is a rotary printing process that can be used for many substrates, including paper or cardboard, using engraved cylinders. Gravure printing is used especially for high-quality editions and large prints where graphics must play an important role in promoting a product, such as a carton pack. This printing process makes it possible in one pass to print up to ten colors, with solvent, water or other inks; to print matt, glossy or structured varnishes; print on front and / or back and emboss.
  • a medium to be printed in the form of a continuous strip passes through a succession of gravure printing units.
  • the printing units are assembled and arranged one after the other from the input of the print medium upstream to its output downstream.
  • Each printing group proceeds to print a pattern with a single specific color or a particular varnish, or even embossing.
  • the principle in gravure is to engrave, on the periphery of a printing cylinder, cells that reproduce the pattern that you want to print.
  • the engraved cylinder rotated is coated with ink by an applicator and rotates inside a tank containing the ink, which allows to fill the cells.
  • the printing medium is then strongly applied against the engraved cylinder, so that the ink contained in the cells can be extracted and transferred onto the medium to be printed.
  • a traditional printing group comprises: a printer carriage, itself presenting: an engraved cylinder, an ink applicator, which pours ink on the cylinder, an ink tray, which recovers the overflow of ink, and a squeegee system, which eliminates excess ink on the cylinder by means of scraping blade, leveling the peripheral surface of the cylinder and leaving only the ink that has penetrated into the cells; a pressure roller, which strongly presses the support to be printed on the cylinder; a pump, which conveys the ink from the reservoir to the ink applicator; and - a dryer, which ensures the rapid evaporation of solvents or water, or the polymerization of UV inks.
  • the squeegee system provides a constant print quality, ensuring control of the amount of ink contained in the cells.
  • the blade is brought into contact with the surface of the cylinder at a line immediately preceding, following the direction of rotation of the cylinder, the zone in which the cylinder comes to contact the medium to be printed.
  • the blade is subjected to a movement back and forth on the surface of the cylinder, in the direction parallel to the axis of revolution of the cylinder.
  • the angle formed by the plane of the blade with the surface of the cylinder also known as the angle of attack, is important to avoid vibrations of the blade or to prevent ink streaks.
  • the contact pressure of the blade on the cylinder must also be adjusted, to allow the contact surface of the edge of the blade against the cylinder, as well as the angle of attack, to remain constant.
  • the cylinder for gravure printing has dimensions and a very large weight which cause, on the one hand, transport difficulties, and on the other hand, positioning difficulties.
  • the cylinder-tank group is removed by the removable printer carriage, which facilitates its handling and permutation, as described for example in document FR-2.539.325.
  • the removable printer carriage which facilitates its handling and permutation, as described for example in document FR-2.539.325.
  • the cylinder-tank group is removed by the removable printer carriage, which facilitates its handling and permutation, as described for example in document FR-2.539.325.
  • STATE OF THE ART DE-38.41.116 discloses a device intended to be used in gravure printing which comprises a blade holder provided with a blade. Means for balancing the pressure of the blade are provided and incorporate two lateral support rods on each of which is embedded a spring, coming to rest against the doctor blade support, and adjusting elements of the hardness of the springs.
  • the squeegee support, and thus the squeegee are also provided for pivoting, with respect to a central axis, passing through the squeegee support and perpendicular to the plane formed by the blade. A shaving of the printing surface is achieved with minimal wear of the blade, the squeegee pressure remaining guaranteed at all points along the squeegee.
  • EP-0,765,745 discloses a cleaning device, used in gravure printing, which comprises a doctor blade that can follow the movement of a cleaning roller by means of a cam link mechanism.
  • a carrier is secured with pins passing through elongated holes.
  • a hydraulic cylinder is attached to the carrier, and an actuating portion of the hydraulic cylinder is connected to the doctor support. By actuation of the hydraulic cylinder, the squeegee carrier moves relative to the carrier, with elongated lumens, allowing the doctor blade holder to move forward and backward with respect to the roller independently.
  • the connecting mechanism to follow the movement of the cleaning roller is essential to ensure that the blade comes touching the surface to be wiped. Since this linking mechanism is linked together Laterally with respect to the cylinder and the hydraulic cylinder is attached laterally to the carrier, the contact between the doctor blade and the surface will be very localized at a single point. In addition, the elongated lights limit the movements of the doctor blade support.
  • EP-0,422,344 discloses a doctor blade device for use with a platen roller for gravure printing.
  • the scraper device comprises a blade, a scraper holder mounted on journals, which are pivotable relative to corresponding lower parts.
  • the lower parts, the squeegee holder and thus the squeegee move back and forth along the cylinder.
  • the lower parts slide in guides towards the cylinder.
  • Air pistons are mechanically connected and press directly on the doctor blade support, so as to slide the lower parts, the doctor blade holder and thus the blade, against the cylinder.
  • the pistons provide a constant pressure, but only when a portion of the blade comes into contact with the peripheral surface of the cylinder.
  • the presence of the trunnions for pivoting causes the thrust of the pistons against the squeegee carrier causes rotational movements of rotation.
  • the back and forth movement also drives each of the pistons.
  • a major problem to be solved by the invention is the development of a doctor blade system for optimal scraping of a peripheral surface of the cylinder.
  • a second problem is to achieve a squeegee system allowing both a back and forth movement of the blade and an optimal efficiency of scraping the cylinder with the same blade.
  • a third problem is that of providing a squeegee system remaining permanently in a printing unit, while ensuring its perfect adaptation to each new cylinder.
  • a fourth problem is to use a squeegee system that is independent of the printer carriage and therefore the cylinder, with several possibilities of adjustment of the squeegee system relative to the cylinder.
  • a fifth problem is to obtain a squeegee system for a printing group, which is both simple and inexpensive to produce. Still another problem is to mount a squeegee system in a gravure printing machine printing unit to provide high print quality.
  • the invention therefore relates to a squeegee system, intended for a printing unit, of the type comprising:
  • a doctor blade support provided with a blade, an edge of the blade being able to come into contact with a peripheral surface of an engraved cylinder; a carrier hub on which the doctor blade support is mounted;
  • the doctor blade system is characterized in that: the means for reciprocating the blade directly drive the blade holder provided with the blade, and
  • the pushing element or elements rest on the structure and move the carrier hub and the blade holder provided with the blade, so as to maintain a constant contact along the entire length of the edge of the blade with the peripheral surface of the engraved cylinder.
  • the blade of the squeegee system will touch and remain constantly in contact with the cylinder, regardless of the angular positioning of the latter relative to the blade.
  • its straight edge can land on the peripheral surface and remain in abutment along its length, during the complete rotation of the cylinder. If the cylinder has surface defects, wear or mounting inaccuracies, the means present on the squeegee system compensate for the differences, regular or variable, existing or occurring when the cylinder performs a revolution.
  • the fine adjustments of the pressure exerted by the edge of the blade on the peripheral surface of the cylinder are not ensured by the thrust element or elements.
  • the goal is to maintain a linear contact of the edge of the blade on the surface rotating cylinder device. Such contact will be obtained with each change of cylinder, when new work is requested.
  • the back and forth means are used to prevent localized wear too fast blade, detrimental to the quality of printing.
  • the doctor blade system thus combines for the blade an ability to move freely, until it enters and remains in constant contact with the surface of the cylinder, and an ability to go back and forth at that surface. of this cylinder.
  • the means for ensuring a movement back and forth of the blade only move the doctor blade holder and blade, without the pushing elements, which results in a lightening of fast moving parts.
  • the thrust element or elements can generate thrust forces that can be exerted on the carrier hub. These forces can be oriented in the plane defined by the blade.
  • the doctor blade system may comprise two thrust elements, which may advantageously be in the form of two springs. These means of applying the thrust to maintain the contact are elastic. These two springs can be arranged laterally, on both sides of the carrier hub, so as to push each side of the carrier hub, towards the peripheral surface of the engraved cylinder.
  • the system may comprise means for compensating a torque induced by the movement of the back and forth of the blade. The torque is induced by the additional degree of freedom imparted to the hub carrier, squeegee support and blade, associated with the reciprocating movement of the doctor carrier and the blade.
  • the means for compensating the torque may comprise a washer, mounted at one end of an axis of rotation of the carrier hub. This axis of rotation allows the adjustment of an angle between the blade and the peripheral surface of the engraved cylinder and constitutes a point of attachment of the carrier hub with the structure.
  • the means for reciprocating the blade may include a pulse finger projecting from the doctor support. This finger can come into contact with pulse means for the back and forth, which are motorized and independent of the doctor blade system.
  • the means for reciprocating the blade may comprise a return spring, positioned between the doctor support and the carrier hub, and providing a free return of the blade. squeegee support, after impulse.
  • a printing unit is characterized in that it is equipped with a doctor blade system having one or more of the technical features described above.
  • a gravure printing machine is characterized in that it comprises at least one printing unit provided with a doctor blade system having one or more of the technical characteristics described above.
  • FIG. 1 represents a simplified, lateral view in elevation, two successive printing units, forming part of a gravure printing machine
  • - Figure 2 shows a simplified side elevational view of a printer carriage
  • - Figure 3 shows a perspective view of the doctor blade system according to the invention
  • FIG. 4 shows a top view of the doctor blade system according to the invention.
  • a gravure printing machine (1) is composed of several printer groups (2 and 3) successively mounted one after the other (only two groups being represented here).
  • the print medium (4) goes upstream (arrow S in Figure 1) in the first printing unit (2), to be printed with a first color, spring (S) downstream, then enter (S) upstream in the second printing unit (3), to be printed with a second color, and spring (S) downstream.
  • the print medium (4) can enter and exit in as many printer groups as necessary to make the different color prints.
  • Each printer unit (2 and 3) comprises a frame (6), a printer carriage (7) inserted in the center of the frame (6), a dryer (8), a pressure roller (9) and a pump (not shown in FIGS. Figures) which provides the ink supply. Due to the routing mechanism of the medium to be printed (4), the first printing unit (2) performs a single-sided printing and the second printing unit (3) performs a back printing of the same medium to be printed (4).
  • the printing carriage (7) comprises (see FIGS. 1 and 2) an engraved cylinder (11) with rotating cells (12) (P-arrow) with respect to its axis of revolution (O) in an ink tray (13). , which recovers the overflow of ink (I), and an ink applicator (14), only shown in Figure 2, fed by the pump.
  • the cells (12) are shown very greatly enlarged in Figure 2.
  • the support to be printed (4) is strongly pressed (FIG. 2) against the engraved roll (11) by the pressure roller (9), so as to carry out a transfer of the ink (I) contained in the cells (12) of the engraved cylinder (11) on the surface of this support (4).
  • a squeegee system (16) which in this embodiment is not part of the printer carriage (7), has the function of wiping off the excess ink (I) on the engraved cylinder (11), by means of a blade (17), visible in Figures 2 and 4 (in dotted lines).
  • the squeegee system (16) is secured to the frame (6) of each printing unit (2 and 3). It should be noted that (see Figure 1), in the case of a single-sided printing, the squeegee system (16) is provided downstream of the frame (6) of the printing unit (2), and in the case of a On the back side, the squeegee system (16) is provided on the upstream side of the frame (6) of the printing unit (3).
  • the squeegee system (16) comprises (see Figures 3 and 4) a doctor blade support (18), a carrier hub (19) and a structure (21).
  • the blade (17) is inserted into the doctor holder (18), so that its edge (22) protrudes and comes into contact with the engraved cylinder (11).
  • the carrier hub (19) is made with two lateral cheeks (23) connected by a central piece (24).
  • the structure (21) of the squeegee system (16) is formed by two side plates (26) which are fixed on corresponding uprights of the frame (6).
  • the squeegee system (16) comprises adjustment means according to the format, that is to say according to the diameter of the engraved cylinder (11).
  • These adjustment means in the format comprise a crank (27) meshing with a series of gears (28), to advance
  • the squeegee system (16) comprises means for adjusting the angle of attack of the blade (17) with respect to the peripheral surface of the engraved cylinder (11), so as to optimize its scraping. These means for adjusting the angle rotate (Arrows A in
  • the squeegee system (16) comprises means for causing the blade (17) to reciprocate (arrows B in FIGS. 3 and 4) on the peripheral surface of the engraved cylinder (11).
  • These means comprise a finger (29) extending laterally from the doctor support (18).
  • the finger (29) is actuated by motorized means (not shown in the Figures) outside the doctor blade system (16).
  • the doctor blade holder (18) is mounted in a slide (not visible) formed in the upper surface of the central piece (24) of the carrier hub (19).
  • the doctor blade support (18) has a lower portion passing through the central piece (24) of the carrier hub (19) and bearing against a return coil spring (31).
  • the back-and-forth movement (B) is in a direction substantially parallel to the axis of revolution (O) of the engraved cylinder (11).
  • the doctor blade support (18) slides laterally in one direction in the slide, being pushed by the finger (29), then slides laterally in another direction in the slideway, being pushed back by the coil spring (31).
  • the squeegee system (16) comprises means for maintaining a constant contact of the entire length of the edge (22) of the blade (17) with the peripheral surface of the engraved cylinder (11).
  • These means are two pushing elements, in the form of two springs (32). These two springs (32) are arranged laterally and act by moving and pushing (Arrows C) each side cheek (23) of the carrier hub (19). With this displacement of the carrier hub (19), the doctor blade holder (18) and the blade (17) move in the direction of the peripheral surface of the engraved cylinder (11).
  • the two springs (32) placed laterally make it possible to exert a differential thrust on one side and / or on the other side of the carrier hub (19).
  • the edge (22) of the blade (17) thus adapts to the irregularities of the peripheral surface and the mounting defects of the engraved cylinder (11) and remains pressed against the peripheral surface of the engraved cylinder (11).
  • Each of the springs (32) is a flat spring fixed and respectively bearing on each of the two side plates (26) of the structure (21) of the doctor blade system (16).
  • the carrier hub (19) moves linearly with respect to the structure (21) of the doctor system (16).
  • the lateral cheeks (23) of the carrier hub (19) and the two side plates (26) of the structure (21) are arranged to allow movement of the carrier hub (19), the doctor blade support (18) and the blade (17) in the same plane as that formed by the blade (17).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

A doctor blade system intended for a print unit includes a doctor blade support provided with a blade, an edge of the blade is able to come into contact with a peripheral surface of an engraved printing cylinder, a supporting hub, on which the doctor blade support is mounted, a structure fixing the supporting hub to a frame of the print unit. Apparatus provides a reciprocating motion of the blade along the peripheral surface of the engraved cylinder roughly parallel to the axis of revolution of the engraved cylinder. Thrust elements drive movement of the blade along the direction of the peripheral surface of the engraved cylinder. The reciprocating apparatus directly drives the doctor blade support. The thrust element or elements move the supporting hub and the doctor blade support and the blade to maintain a constant contact over the entire length of the edge of the blade with the peripheral surface of the engraved cylinder.

Description

SYSTEME DE RACLE POUR GROUPE IMPRIMEUR DESTINE A UNE MACHINE D'IMPRESSION EN HÉLIOGRAVURE PRINTER GROUP ROOT SYSTEM FOR A HÉLIOGRAVURE PRINTING MACHINE

La présente invention concerne un système de racle, muni d'une racle.The present invention relates to a squeegee system, provided with a squeegee.

L'invention se rapporte également à un groupe imprimeur équipé d'un système de racle. L'invention concerne enfin une machine d'impression en héliogravure, intégrant au moins un groupe imprimeur.The invention also relates to a printing unit equipped with a doctor blade system. The invention finally relates to a gravure printing machine, incorporating at least one printing unit.

L'héliogravure, également appelée hélio est un procédé d'impression rotatif utilisable pour de nombreux supports, dont le papier ou le carton, utilisant des cylindres gravés. L'impression en hélio est employée particulièrement pour les éditions de grande qualité et de grands tirages où le graphisme doit jouer un rôle important pour assurer la promotion d'un produit, tel qu'un emballage sous la forme d'une boîte en carton. Ce procédé d'impression permet en un seul passage d'imprimer jusqu'à dix couleurs, avec des encres à solvants, à l'eau ou autres ; d'imprimer des vernis mats, brillants ou structurés ; d'imprimer en recto et/ou en verso et de gaufrer.Photogravure, also called rotogravure, is a rotary printing process that can be used for many substrates, including paper or cardboard, using engraved cylinders. Gravure printing is used especially for high-quality editions and large prints where graphics must play an important role in promoting a product, such as a carton pack. This printing process makes it possible in one pass to print up to ten colors, with solvent, water or other inks; to print matt, glossy or structured varnishes; print on front and / or back and emboss.

Ainsi, dans une machine d'impression en hélio, un support à imprimer sous la forme d'une bande continue traverse une succession de groupes imprimeurs hélio. Les groupes imprimeurs sont assemblés et disposés les uns à la suite des autres depuis l'entrée du support à imprimer en amont jusqu'à sa sortie en aval. Chaque groupe imprimeur procède à l'impression d'un motif avec une seule couleur spécifique ou un vernis particulier, ou bien encore effectuant un gaufrage.Thus, in a gravure printing machine, a medium to be printed in the form of a continuous strip passes through a succession of gravure printing units. The printing units are assembled and arranged one after the other from the input of the print medium upstream to its output downstream. Each printing group proceeds to print a pattern with a single specific color or a particular varnish, or even embossing.

Le principe en hélio consiste à graver, sur la périphérie d'un cylindre d'impression, des alvéoles qui reproduisent le motif que l'on souhaite imprimer. Le cylindre gravé entraîné en rotation est recouvert d'encre grâce à un applicateur et tourne à l'intérieur d'une cuve contenant l'encre, ce qui permet de remplir les alvéoles. Le support à imprimer est ensuite appliqué fortement contre le cylindre gravé, de façon à ce que l'encre contenue dans les alvéoles puisse être extraite et transférée sur le support à imprimer.The principle in gravure is to engrave, on the periphery of a printing cylinder, cells that reproduce the pattern that you want to print. The engraved cylinder rotated is coated with ink by an applicator and rotates inside a tank containing the ink, which allows to fill the cells. The printing medium is then strongly applied against the engraved cylinder, so that the ink contained in the cells can be extracted and transferred onto the medium to be printed.

Un groupe imprimeur traditionnel comprend : un chariot imprimeur, présentant lui-même : un cylindre gravé, un applicateur d'encre, qui déverse l'encre sur le cylindre, un bac à encre, qui récupère le trop plein d'encre, et un système de racle, qui élimine le surplus d'encre sur le cylindre au moyen d'une lame de raclage, arasant la surface périphérique du cylindre et ne laissant que l'encre qui a pénétré dans les alvéoles ; un rouleau presseur, qui appuie fortement le support à imprimer sur le cylindre ; une pompe, qui assure l'acheminement de l'encre du réservoir à l' applicateur d'encre ; et - un sécheur, qui assure l'évaporation rapide des solvants ou de l'eau, ou bien la polymérisation des encres à UV.A traditional printing group comprises: a printer carriage, itself presenting: an engraved cylinder, an ink applicator, which pours ink on the cylinder, an ink tray, which recovers the overflow of ink, and a squeegee system, which eliminates excess ink on the cylinder by means of scraping blade, leveling the peripheral surface of the cylinder and leaving only the ink that has penetrated into the cells; a pressure roller, which strongly presses the support to be printed on the cylinder; a pump, which conveys the ink from the reservoir to the ink applicator; and - a dryer, which ensures the rapid evaporation of solvents or water, or the polymerization of UV inks.

Si la qualité de l'impression dépend donc fortement de la qualité du cylindre gravé, le système de racle permet d'obtenir une qualité d'impression constante, en assurant le contrôle de la quantité d'encre contenue dans les alvéoles. La lame est mise en contact avec la surface du cylindre au niveau d'une ligne qui précède immédiatement, en suivant le sens de rotation du cylindre, la zone dans laquelle le cylindre vient contacter le support à imprimer.If the quality of the print depends greatly on the quality of the engraved cylinder, the squeegee system provides a constant print quality, ensuring control of the amount of ink contained in the cells. The blade is brought into contact with the surface of the cylinder at a line immediately preceding, following the direction of rotation of the cylinder, the zone in which the cylinder comes to contact the medium to be printed.

La lame est soumise à un mouvement de va-et-vient à la surface du cylindre, selon la direction parallèle à l'axe de révolution du cylindre. L'angle formé par le plan de la lame avec la surface du cylindre, également connu sous le terme angle d'attaque, est important pour éviter des vibrations de la lame ou pour empêcher des traînées d'encre. La pression de contact de la lame sur le cylindre doit également être ajustée, pour permettre à la surface de contact de l'arête de la lame contre le cylindre, ainsi qu'à l'angle d'attaque, de rester constants. Le cylindre pour l'impression hélio possède des dimensions et un poids très important qui entraînent, d'une part, des difficultés de transport, et d'autre part, des difficultés de positionnement. Lors d'un changement de travail, le groupe cylindre-cuve est enlevé par le chariot imprimeur amovible, qui facilite sa manutention et sa permutation, comme le décrit par exemple le document FR- 2.539.325. Ainsi, en raison des nombreux changements de cylindre, celui-ci se positionne avec des écarts par rapport au bâti du groupe imprimeur. Ces écarts, constituant un défaut de parallélisme entre la lame et le cylindre, engendrent un écartement entre l'arête longiligne de la lame et l'axe de rotation du cylindre. Ce phénomène implique la nécessité d'avoir un rattrapage pour la lame de raclage.The blade is subjected to a movement back and forth on the surface of the cylinder, in the direction parallel to the axis of revolution of the cylinder. The angle formed by the plane of the blade with the surface of the cylinder, also known as the angle of attack, is important to avoid vibrations of the blade or to prevent ink streaks. The contact pressure of the blade on the cylinder must also be adjusted, to allow the contact surface of the edge of the blade against the cylinder, as well as the angle of attack, to remain constant. The cylinder for gravure printing has dimensions and a very large weight which cause, on the one hand, transport difficulties, and on the other hand, positioning difficulties. During a change of work, the cylinder-tank group is removed by the removable printer carriage, which facilitates its handling and permutation, as described for example in document FR-2.539.325. Thus, because of the many cylinder changes, it is positioned with deviations from the frame of the printing unit. These differences, constituting a lack of parallelism between the blade and the cylinder, cause a spacing between the long line edge of the blade and the axis of rotation of the cylinder. This phenomenon implies the need to have a catch for the scraper blade.

Il arrive que le cylindre soit éventuellement gravé de manière désaxée, ou que le support à imprimer soit en biais à l'intérieur du groupe imprimeur. Pour corriger de tels défauts, engendrant des défauts à l'impression, une technique de réglage par désaxage du cylindre gravé, connue sous la dénomination de « skewing », est utilisée. Ce biaisage volontaire engendre un défaut de parallélisme entre le cylindre et la lame, qui doit être corrigé pour éviter tout raclage de mauvaise qualité.It happens that the cylinder is possibly etched off-axis, or that the support to be printed is skewed inside the printing unit. To correct such defects, resulting in printing defects, a technique of adjustment by offsetting the engraved cylinder, known under the name of "skewing", is used. This voluntary bias causes a defect of parallelism between the cylinder and the blade, which must be corrected to avoid scraping of poor quality.

Etat de la technique On connaît d'après le document DE- 38.41.116 un dispositif destiné à être utilisé en impression par gravure qui comprend un support de racle muni d'une lame. Des moyens pour équilibrer la pression de la lame sont prévus et intègrent deux tiges porteuses latérales sur chacune desquelles est enchâssé un ressort, venant appuyer contre le support de racle, et des éléments de réglage de la dureté des ressorts. Le support de racle, et ainsi la racle, sont également prévus pour pivoter, par rapport à un axe central, traversant le support de racle et perpendiculaire au plan formé par la lame. Un arasage de la surface d'impression est réalisé avec une usure minimale de la racle, la pression d'appui de la racle restant garantie en tous points le long de la racle.STATE OF THE ART DE-38.41.116 discloses a device intended to be used in gravure printing which comprises a blade holder provided with a blade. Means for balancing the pressure of the blade are provided and incorporate two lateral support rods on each of which is embedded a spring, coming to rest against the doctor blade support, and adjusting elements of the hardness of the springs. The squeegee support, and thus the squeegee, are also provided for pivoting, with respect to a central axis, passing through the squeegee support and perpendicular to the plane formed by the blade. A shaving of the printing surface is achieved with minimal wear of the blade, the squeegee pressure remaining guaranteed at all points along the squeegee.

Cependant, un tel dispositif présente l'inconvénient de posséder un point de pivotement, ce qui se traduit par l'existence d'un point de butée pour la lame, lorsqu'elle se déplace en direction de la surface à racler. La lame ne va pouvoir suivre de manière optimale la surface à racler.However, such a device has the disadvantage of having a pivot point, which results in the existence of a stop point for the blade when moving towards the surface to be scraped. The blade will not be able to optimally follow the surface to be scraped.

Le document EP- 0.765.745 décrit un dispositif de nettoyage, utilisé en impression par gravure, qui comprend une racle pouvant suivre le mouvement d'un rouleau nettoyeur grâce à un mécanisme de liaison à came. Un porteur est fixé à l'aide de broches passant par des trous allongés. Un cylindre hydraulique est fixé au porteur, et une partie d'actionnement du cylindre hydraulique est connectée au support de racle. Par actionnement du cylindre hydraulique, le support de racle se déplace par rapport au porteur, grâce à des lumières allongées, permettant au support de racle d'avancer et de reculer par rapport au rouleau, de manière indépendante.EP-0,765,745 discloses a cleaning device, used in gravure printing, which comprises a doctor blade that can follow the movement of a cleaning roller by means of a cam link mechanism. A carrier is secured with pins passing through elongated holes. A hydraulic cylinder is attached to the carrier, and an actuating portion of the hydraulic cylinder is connected to the doctor support. By actuation of the hydraulic cylinder, the squeegee carrier moves relative to the carrier, with elongated lumens, allowing the doctor blade holder to move forward and backward with respect to the roller independently.

Cependant, avec un tel dispositif, le mécanisme de liaison pour suivre le déplacement du rouleau nettoyeur reste indispensable pour s'assurer que la lame vienne toucher la surface à essuyer. Etant donné que ce mécanisme de liaison est solidarisé latéralement par rapport au cylindre et que le cylindre hydraulique est fixé latéralement au porteur, le contact entre la racle et la surface va être très localisé en un seul point. De plus, les lumières allongées, limitent les mouvements du support de racle.However, with such a device, the connecting mechanism to follow the movement of the cleaning roller is essential to ensure that the blade comes touching the surface to be wiped. Since this linking mechanism is linked together Laterally with respect to the cylinder and the hydraulic cylinder is attached laterally to the carrier, the contact between the doctor blade and the surface will be very localized at a single point. In addition, the elongated lights limit the movements of the doctor blade support.

Le document EP- 0.422.344 divulgue un dispositif de racle destiné à être utilisé avec un cylindre porte-clichés pour une impression hélio. Le dispositif de racle comprend une lame, un support de racle monté sur des tourillons, qui sont aptes à pivoter par rapport à des pièces inférieures correspondantes. Les pièces inférieures, le support de racle et ainsi la racle effectuent un mouvement de va-et-vient le long du cylindre. Les pièces inférieures coulissent dans des guidages en direction du cylindre. Des pistons à air sont mécaniquement connectés et appuient directement sur le support de racle, de façon à faire coulisser les pièces inférieures, le support de racle et ainsi la lame, contre le cylindre.EP-0,422,344 discloses a doctor blade device for use with a platen roller for gravure printing. The scraper device comprises a blade, a scraper holder mounted on journals, which are pivotable relative to corresponding lower parts. The lower parts, the squeegee holder and thus the squeegee move back and forth along the cylinder. The lower parts slide in guides towards the cylinder. Air pistons are mechanically connected and press directly on the doctor blade support, so as to slide the lower parts, the doctor blade holder and thus the blade, against the cylinder.

Cependant, les pistons assurent une pression constante, mais uniquement lorsqu'une partie de la lame entre bien en contact avec la surface périphérique du cylindre. De plus, la présence des tourillons pour le pivotement fait que la poussée des pistons contre le support de racle engendre des mouvements parasites de rotation. Enfin, le mouvement de va-et-vient entraîne également chacun des pistons.However, the pistons provide a constant pressure, but only when a portion of the blade comes into contact with the peripheral surface of the cylinder. In addition, the presence of the trunnions for pivoting causes the thrust of the pistons against the squeegee carrier causes rotational movements of rotation. Finally, the back and forth movement also drives each of the pistons.

Exposé de l'invention Un problème principal que se propose de résoudre l'invention consiste à mettre au point un système de racle permettant un raclage optimal d'une surface périphérique du cylindre. Un deuxième problème est de réaliser un système de racle permettant à la fois un mouvement de va-et-vient de la lame et une efficacité optimale de raclage du cylindre avec cette même lame. Un troisième problème est celui de prévoir un système de racle restant à demeure dans un groupe imprimeur, tout en s'assurant de sa parfaite adaptation à chaque nouveau cylindre. Un quatrième problème est d'utiliser un système de racle qui soit indépendant du chariot imprimeur et donc du cylindre, avec plusieurs possibilités d'ajustement du système de racle par rapport au cylindre. Un cinquième problème est d'obtenir un système de racle pour un groupe imprimeur, qui soit à la fois simple et peu coûteux à réaliser. Un autre problème encore est de monter un système de racle dans un groupe imprimeur pour machine d'impression en héliogravure permettant de procurer une grande qualité d'impression. L'invention concerne donc un système de racle, destiné à un groupe imprimeur, du type comprenant :SUMMARY OF THE INVENTION A major problem to be solved by the invention is the development of a doctor blade system for optimal scraping of a peripheral surface of the cylinder. A second problem is to achieve a squeegee system allowing both a back and forth movement of the blade and an optimal efficiency of scraping the cylinder with the same blade. A third problem is that of providing a squeegee system remaining permanently in a printing unit, while ensuring its perfect adaptation to each new cylinder. A fourth problem is to use a squeegee system that is independent of the printer carriage and therefore the cylinder, with several possibilities of adjustment of the squeegee system relative to the cylinder. A fifth problem is to obtain a squeegee system for a printing group, which is both simple and inexpensive to produce. Still another problem is to mount a squeegee system in a gravure printing machine printing unit to provide high print quality. The invention therefore relates to a squeegee system, intended for a printing unit, of the type comprising:

- un support de racle muni d'une lame, une arête de la lame étant apte à entrer en contact avec une surface périphérique d'un cylindre gravé, - un moyeu porteur, sur lequel est monté le support de racle,a doctor blade support provided with a blade, an edge of the blade being able to come into contact with a peripheral surface of an engraved cylinder; a carrier hub on which the doctor blade support is mounted;

- une structure, assurant une fixation du moyeu porteur au niveau d'un bâti du groupe imprimeur,a structure, ensuring fastening of the carrier hub at the level of a frame of the printing unit,

- des moyens pour assurer un mouvement de va-et-vient de la lame à la surface périphérique du cylindre gravé, selon une direction sensiblement parallèle à l'axe de révolution dudit cylindre gravé, etmeans for reciprocating the blade to the peripheral surface of the engraved cylinder in a direction substantially parallel to the axis of revolution of said engraved cylinder, and

- un ou des éléments de poussée, entraînant un déplacement de la lame en direction de ladite surface périphérique dudit cylindre gravé.- One or more thrust elements, causing a displacement of the blade towards said peripheral surface of said engraved cylinder.

Conformément à un aspect de la présente invention, le système de racle est caractérisé : - en ce que les moyens pour assurer un mouvement de va-et-vient de la lame entraînent directement le support de racle muni de la lame, etAccording to one aspect of the present invention, the doctor blade system is characterized in that: the means for reciprocating the blade directly drive the blade holder provided with the blade, and

- en ce que le ou les éléments de poussée s'appuient sur la structure et déplacent le moyeu porteur et le support de racle muni de la lame, de façon à conserver un contact constant de toute la longueur de l'arête de la lame avec la surface périphérique du cylindre gravé.in that the pushing element or elements rest on the structure and move the carrier hub and the blade holder provided with the blade, so as to maintain a constant contact along the entire length of the edge of the blade with the peripheral surface of the engraved cylinder.

Autrement dit, avec les moyens de l'invention, la lame du système de racle va toucher et rester constamment en contact avec le cylindre, quel que soit le positionnement angulaire de ce dernier par rapport à la lame. Par un déplacement libre et sans entrave de la lame en direction du cylindre, son arête rectiligne arrive à se poser sur la surface périphérique et à rester en butée sur toute sa longueur, lors de la rotation complète du cylindre. Si le cylindre possède des défauts de surface, des usures ou des imprécisions de montage, les moyens présents sur le système de racle viennent compenser les écarts, réguliers ou variables, existants ou survenant lorsque le cylindre effectue une révolution.In other words, with the means of the invention, the blade of the squeegee system will touch and remain constantly in contact with the cylinder, regardless of the angular positioning of the latter relative to the blade. By a free and unhindered movement of the blade towards the cylinder, its straight edge can land on the peripheral surface and remain in abutment along its length, during the complete rotation of the cylinder. If the cylinder has surface defects, wear or mounting inaccuracies, the means present on the squeegee system compensate for the differences, regular or variable, existing or occurring when the cylinder performs a revolution.

Les réglages fins de la pression exercée par l'arête de la lame sur la surface périphérique du cylindre ne sont pas assurés par le ou les éléments de poussée. L'objectif est de conserver un contact linéique de l'arête de la lame sur la surface périphérique du cylindre en rotation. Un tel contact va être obtenu à chaque changement de cylindres, lorsque des nouveaux travaux sont demandés.The fine adjustments of the pressure exerted by the edge of the blade on the peripheral surface of the cylinder are not ensured by the thrust element or elements. The goal is to maintain a linear contact of the edge of the blade on the surface rotating cylinder device. Such contact will be obtained with each change of cylinder, when new work is requested.

Les moyens de va-et-vient sont utilisés pour éviter une usure localisée trop rapide de la lame, portant préjudice à la qualité de l'impression. Le système de racle combine ainsi pour la lame une aptitude à se déplacer librement, jusqu'à ce que celle-ci entre et reste constamment en contact avec la surface du cylindre, et une capacité à effectuer des allers-retours au niveau de cette surface de ce cylindre. De plus, les moyens pour assurer un mouvement de va-et-vient de la lame font uniquement déplacer le support de racle et sa lame, sans les éléments de poussée, ce qui se traduit par un allégement des pièces en mouvement rapide.The back and forth means are used to prevent localized wear too fast blade, detrimental to the quality of printing. The doctor blade system thus combines for the blade an ability to move freely, until it enters and remains in constant contact with the surface of the cylinder, and an ability to go back and forth at that surface. of this cylinder. In addition, the means for ensuring a movement back and forth of the blade only move the doctor blade holder and blade, without the pushing elements, which results in a lightening of fast moving parts.

Très préférentiellement, le ou les éléments de poussée peuvent génèrent des forces de poussée pouvant s'exercer sur le moyeu porteur. Ces forces peuvent être orientées dans le plan défini par la lame. Le système de racle peut comprendre deux éléments de poussée, pouvant se présenter avantageusement sous la forme de deux ressorts. Ces moyens d'application de la poussée pour assurer un maintien du contact sont élastiques. Ces deux ressorts peuvent être disposés latéralement, des deux côtés du moyeu porteur, de façon à pouvoir pousser chaque côté de ce moyeu porteur, en direction de la surface périphérique du cylindre gravé. De manière favorable, le système peut comprendre des moyens pour compenser un couple induit par le mouvement de va-et-vient de la lame. Le couple est induit par le degré de liberté supplémentaire conféré au moyeu porteur, au support de racle et à la lame, associé au mouvement alternatif du support de racle et de la lame. Les moyens pour compenser le couple peuvent comprendre une rondelle, montée à une extrémité d'un axe de rotation du moyeu porteur. Cet axe de rotation permet le réglage d'un angle entre la lame et la surface périphérique du cylindre gravé et constitue un point d'attache du moyeu porteur avec la structure.Very preferably, the thrust element or elements can generate thrust forces that can be exerted on the carrier hub. These forces can be oriented in the plane defined by the blade. The doctor blade system may comprise two thrust elements, which may advantageously be in the form of two springs. These means of applying the thrust to maintain the contact are elastic. These two springs can be arranged laterally, on both sides of the carrier hub, so as to push each side of the carrier hub, towards the peripheral surface of the engraved cylinder. Favorably, the system may comprise means for compensating a torque induced by the movement of the back and forth of the blade. The torque is induced by the additional degree of freedom imparted to the hub carrier, squeegee support and blade, associated with the reciprocating movement of the doctor carrier and the blade. The means for compensating the torque may comprise a washer, mounted at one end of an axis of rotation of the carrier hub. This axis of rotation allows the adjustment of an angle between the blade and the peripheral surface of the engraved cylinder and constitutes a point of attachment of the carrier hub with the structure.

Les moyens pour assurer un mouvement de va-et-vient de la lame peuvent comprendre un doigt d'impulsion faisant saillie à partir du support de racle. Ce doigt peut entrer en contact avec des moyens d'impulsion pour le va-et-vient, qui sont motorisés, et indépendants du système de racle. Les moyens pour assurer un mouvement de va-et-vient de la lame peuvent comprendre un ressort de rappel, positionné entre le support de racle et le moyeu porteur, et assurant un retour libre du support de racle, après impulsion.The means for reciprocating the blade may include a pulse finger projecting from the doctor support. This finger can come into contact with pulse means for the back and forth, which are motorized and independent of the doctor blade system. The means for reciprocating the blade may comprise a return spring, positioned between the doctor support and the carrier hub, and providing a free return of the blade. squeegee support, after impulse.

Conformément à un deuxième aspect de la présente invention, un groupe imprimeur est caractérisé en ce qu'il est équipé avec un système de racle présentant une ou plusieurs des caractéristiques techniques décrites ci-dessus.According to a second aspect of the present invention, a printing unit is characterized in that it is equipped with a doctor blade system having one or more of the technical features described above.

Conformément à un troisième aspect de la présente invention, une machine d'impression en héliogravure est caractérisée en ce qu'elle comprend au moins un groupe imprimeur muni d'un système de racle présentant une ou plusieurs des caractéristiques techniques décrites ci-dessus.According to a third aspect of the present invention, a gravure printing machine is characterized in that it comprises at least one printing unit provided with a doctor blade system having one or more of the technical characteristics described above.

Brève description des dessinsBrief description of the drawings

L'invention sera bien comprise et ses divers avantages et différentes caractéristiques ressortiront mieux lors de la description suivante, de l'exemple non limitatif de réalisation, en référence aux dessins schématiques annexés, dans lesquels : - la Figure 1 représente une vue simplifiée, latérale, en élévation, de deux groupes imprimeurs successifs, faisant partie d'une machine d'impression en héliogravure ;The invention will be better understood and its various advantages and different characteristics will become more apparent in the following description, of the non-limiting example of embodiment, with reference to the appended diagrammatic drawings, in which: FIG. 1 represents a simplified, lateral view in elevation, two successive printing units, forming part of a gravure printing machine;

- la Figure 2 représente une vue simplifiée, latérale, en élévation d'un chariot imprimeur ; - la Figure 3 représente une vue en perspective du système de racle selon l'invention ; et- Figure 2 shows a simplified side elevational view of a printer carriage; - Figure 3 shows a perspective view of the doctor blade system according to the invention; and

- la Figure 4 représente une vue du dessus du système de racle selon l'invention.- Figure 4 shows a top view of the doctor blade system according to the invention.

Exposé détaillé des modes de réalisation préférés Comme l'illustre la Figure 1, une machine d'impression en héliogravure (1) est composée de plusieurs groupes imprimeurs (2 et 3) montés successivement les uns à la suite des autres (seuls deux groupes étant représentés ici). Le support à imprimer (4) rentre en amont (Flèche S en Figure 1) dans le premier groupe imprimeur (2), pour être imprimé avec une première couleur, en ressort (S) en aval, puis rentre (S) en amont dans le deuxième groupe imprimeur (3), pour être imprimé avec une deuxième couleur, et en ressort (S) en aval. Le support à imprimer (4) peut entrer et ressortir dans autant de groupes imprimeurs que nécessaires, pour réaliser les impressions de couleurs différentes. Chaque groupe imprimeur (2 et 3) comprend un bâti (6), un chariot imprimeur (7) inséré au centre du bâti (6), un sécheur (8), un rouleau presseur (9) et une pompe (non représentée dans les Figures) qui assure l'alimentation en encre. En raison du mécanisme de cheminement du support à imprimer (4), le premier groupe imprimeur (2) réalise une impression recto et le deuxième groupe imprimeur (3) réalise une impression verso de ce même support à imprimer (4).DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As illustrated in FIG. 1, a gravure printing machine (1) is composed of several printer groups (2 and 3) successively mounted one after the other (only two groups being represented here). The print medium (4) goes upstream (arrow S in Figure 1) in the first printing unit (2), to be printed with a first color, spring (S) downstream, then enter (S) upstream in the second printing unit (3), to be printed with a second color, and spring (S) downstream. The print medium (4) can enter and exit in as many printer groups as necessary to make the different color prints. Each printer unit (2 and 3) comprises a frame (6), a printer carriage (7) inserted in the center of the frame (6), a dryer (8), a pressure roller (9) and a pump (not shown in FIGS. Figures) which provides the ink supply. Due to the routing mechanism of the medium to be printed (4), the first printing unit (2) performs a single-sided printing and the second printing unit (3) performs a back printing of the same medium to be printed (4).

Le chariot imprimeur (7) comprend (voir Figures 1 et 2) un cylindre gravé (11) avec des alvéoles (12), tournant (Flèche P) par rapport à son axe de révolution (O) dans un bac à encre (13), qui récupère le trop plein d'encre (I), et un applicateur d'encre (14), uniquement montré en Figure 2, alimenté par la pompe. Les alvéoles (12) sont représentées très fortement agrandies en Figure 2.The printing carriage (7) comprises (see FIGS. 1 and 2) an engraved cylinder (11) with rotating cells (12) (P-arrow) with respect to its axis of revolution (O) in an ink tray (13). , which recovers the overflow of ink (I), and an ink applicator (14), only shown in Figure 2, fed by the pump. The cells (12) are shown very greatly enlarged in Figure 2.

Le support à imprimer (4) est fortement pressé (Figure 2) contre le cylindre gravé (11) par le rouleau presseur (9), de façon à réaliser un transfert de l'encre (I) contenu dans les alvéoles (12) du cylindre gravé (11) à la surface de ce support (4). Un système de racle (16), qui, dans cet exemple de réalisation ne fait pas partie du chariot imprimeur (7), a pour fonction d'essuyer le surplus d'encre (I) sur le cylindre gravé (11), au moyen d'une lame (17), visible en Figures 2 et 4 (en pointillés).The support to be printed (4) is strongly pressed (FIG. 2) against the engraved roll (11) by the pressure roller (9), so as to carry out a transfer of the ink (I) contained in the cells (12) of the engraved cylinder (11) on the surface of this support (4). A squeegee system (16), which in this embodiment is not part of the printer carriage (7), has the function of wiping off the excess ink (I) on the engraved cylinder (11), by means of a blade (17), visible in Figures 2 and 4 (in dotted lines).

Le système de racle (16) est solidarisé au bâti (6) de chaque groupe imprimeur (2 et 3). Il est à noter que (voir Figure 1), dans le cas d'une impression recto, le système de racle (16) est prévu côté aval du bâti (6) du groupe imprimeur (2), et dans le cas d'une impression verso, le système de racle (16) est prévu côté amont du bâti (6) du groupe imprimeur (3).The squeegee system (16) is secured to the frame (6) of each printing unit (2 and 3). It should be noted that (see Figure 1), in the case of a single-sided printing, the squeegee system (16) is provided downstream of the frame (6) of the printing unit (2), and in the case of a On the back side, the squeegee system (16) is provided on the upstream side of the frame (6) of the printing unit (3).

Le système de racle (16) comprend (voir Figures 3 et 4) un support de racle (18), un moyeu porteur (19) et une structure (21). La lame (17) est insérée dans le support de racle (18), de façon à ce que son arête (22) fasse saillie et vienne toucher le cylindre gravé (11). Le moyeu porteur (19) est réalisé avec deux joues latérales (23) reliées par une pièce centrale (24). La structure (21) du système de racle (16) est formée par deux plaques latérales (26) venant se fixer sur des montants correspondants du bâti (6).The squeegee system (16) comprises (see Figures 3 and 4) a doctor blade support (18), a carrier hub (19) and a structure (21). The blade (17) is inserted into the doctor holder (18), so that its edge (22) protrudes and comes into contact with the engraved cylinder (11). The carrier hub (19) is made with two lateral cheeks (23) connected by a central piece (24). The structure (21) of the squeegee system (16) is formed by two side plates (26) which are fixed on corresponding uprights of the frame (6).

Le système de racle (16) comprend des moyens de réglage selon le format, c'est- à-dire en fonction du diamètre du cylindre gravé (11). Ces moyens de réglage au format comprennent une manivelle (27) engrenant une série de pignons (28), pour faire avancerThe squeegee system (16) comprises adjustment means according to the format, that is to say according to the diameter of the engraved cylinder (11). These adjustment means in the format comprise a crank (27) meshing with a series of gears (28), to advance

(Flèche F en Figure 3) ou reculer (Flèche R en Figure 3) le moyeu porteur (19) le long de deux glissières ménagées dans la structure (21). Le système de racle (16) comprend des moyens de réglage de l'angle d'attaque de la lame (17) par rapport à la surface périphérique du cylindre gravé (11), de façon à optimiser son raclage. Ces moyens de réglage de l'angle font pivoter (Flèches A en(Arrow F in Figure 3) or back (Arrow R in Figure 3) the carrier hub (19) along two rails in the structure (21). The squeegee system (16) comprises means for adjusting the angle of attack of the blade (17) with respect to the peripheral surface of the engraved cylinder (11), so as to optimize its scraping. These means for adjusting the angle rotate (Arrows A in

Figure 3) la pièce centrale (24) du moyeu porteur (19), vers le haut et vers le bas par rapport aux deux joues latérales (23), par rapport à un axe (X).Figure 3) the central piece (24) of the carrier hub (19), upwardly and downwardly relative to the two side flanges (23), with respect to an axis (X).

Le système de racle (16) comprend des moyens pour faire effectuer à la lame (17) un mouvement de va-et-vient (Flèches B en Figures 3 et 4) sur la surface périphérique du cylindre gravé (11). Ces moyens comprennent un doigt (29) se déployant latéralement à partir du support de racle (18). Le doigt (29) est actionné par des moyens motorisés (non représentés dans les Figures), extérieurs au système de racle (16). Le support de racle (18) est monté dans une glissière (non visible) ménagée dans la surface supérieure de la pièce centrale (24) du moyeu porteur (19). Le support de racle (18) possède une partie inférieure traversant la pièce centrale (24) du moyeu porteur (19) et s'appuyant contre un ressort hélicoïdal de rappel (31). Le mouvement de va-et-vient (B) se fait selon une direction sensiblement parallèle à l'axe de révolution (O) du cylindre gravé (11). Le support de racle (18) coulisse latéralement dans un sens dans la glissière, en étant poussé par le doigt (29), puis coulisse latéralement dans un autre sens dans la glissière, en étant repoussé par le ressort hélicoïdal (31). Selon l'invention, le système de racle (16) comprend des moyens destinés à conserver un contact constant de toute la longueur de l'arête (22) de la lame (17) avec la surface périphérique du cylindre gravé (11). Ces moyens sont deux éléments de poussée, sous la forme de deux ressorts (32). Ces deux ressorts (32), sont disposés latéralement, et agissent en déplaçant et en poussant (Flèches C) chaque joue latérale (23) du moyeu porteur (19). Avec ce déplacement du moyeu porteur (19), le support de racle (18) et la lame (17) se déplacent en direction de la surface périphérique du cylindre gravé (11).The squeegee system (16) comprises means for causing the blade (17) to reciprocate (arrows B in FIGS. 3 and 4) on the peripheral surface of the engraved cylinder (11). These means comprise a finger (29) extending laterally from the doctor support (18). The finger (29) is actuated by motorized means (not shown in the Figures) outside the doctor blade system (16). The doctor blade holder (18) is mounted in a slide (not visible) formed in the upper surface of the central piece (24) of the carrier hub (19). The doctor blade support (18) has a lower portion passing through the central piece (24) of the carrier hub (19) and bearing against a return coil spring (31). The back-and-forth movement (B) is in a direction substantially parallel to the axis of revolution (O) of the engraved cylinder (11). The doctor blade support (18) slides laterally in one direction in the slide, being pushed by the finger (29), then slides laterally in another direction in the slideway, being pushed back by the coil spring (31). According to the invention, the squeegee system (16) comprises means for maintaining a constant contact of the entire length of the edge (22) of the blade (17) with the peripheral surface of the engraved cylinder (11). These means are two pushing elements, in the form of two springs (32). These two springs (32) are arranged laterally and act by moving and pushing (Arrows C) each side cheek (23) of the carrier hub (19). With this displacement of the carrier hub (19), the doctor blade holder (18) and the blade (17) move in the direction of the peripheral surface of the engraved cylinder (11).

Les deux ressorts (32) placés latéralement permettent d'exercer une poussée différentielle d'un côté et/ou de l'autre côté du moyeu porteur (19). L'arête (22) de la lame (17) s'adapte ainsi aux irrégularités de la surface périphérique et aux défauts de montage du cylindre gravé (11) et reste plaquée contre la surface périphérique du cylindre gravé (11).The two springs (32) placed laterally make it possible to exert a differential thrust on one side and / or on the other side of the carrier hub (19). The edge (22) of the blade (17) thus adapts to the irregularities of the peripheral surface and the mounting defects of the engraved cylinder (11) and remains pressed against the peripheral surface of the engraved cylinder (11).

Chacun des ressorts (32) est un ressort plat fixé et prenant respectivement appui sur chacune des deux plaques latérales (26) de la structure (21) du système de racle (16). Le moyeu porteur (19) se déplace de manière linéaire par rapport à la structure (21) du système de racle (16).Each of the springs (32) is a flat spring fixed and respectively bearing on each of the two side plates (26) of the structure (21) of the doctor blade system (16). The carrier hub (19) moves linearly with respect to the structure (21) of the doctor system (16).

Les joues latérales (23) du moyeu porteur (19) et les deux plaques latérales (26) de la structure (21) sont agencées pour permettre un déplacement du moyeu porteur (19), du support de racle (18) et de la lame (17) dans le même plan que celui que forme la lame (17).The lateral cheeks (23) of the carrier hub (19) and the two side plates (26) of the structure (21) are arranged to allow movement of the carrier hub (19), the doctor blade support (18) and the blade (17) in the same plane as that formed by the blade (17).

Lorsque le mouvement de va-et-vient (B) de la lame (17) s'effectue en même temps qu'un déplacement pour conserver un contact constant de toute la longueur de l'arête (22) de la lame (17) avec la surface périphérique du cylindre gravé (11), il se crée un couple parasite induit au niveau du moyeu porteur (19). Pour ce faire, une rondelle (33) est montée à une extrémité d'un axe de rotation (X) du moyeu porteur (19) permettant le réglage (A) d'un angle entre la lame (17) et la surface périphérique du cylindre gravé (11).When the reciprocating movement (B) of the blade (17) is performed at the same time as a movement to maintain a constant contact along the entire length of the edge (22) of the blade (17) with the peripheral surface of the engraved cylinder (11), an induced parasitic torque is created at the level of the carrier hub (19). To do this, a washer (33) is mounted at one end of an axis of rotation (X) of the carrier hub (19) allowing adjustment (A) of an angle between the blade (17) and the peripheral surface of the engraved cylinder (11).

La présente invention n'est pas limitée aux modes de réalisation décrits et illustrés. De nombreuses modifications peuvent être réalisées, sans pour autant sortir du cadre défini par la portée du jeu de revendications. The present invention is not limited to the embodiments described and illustrated. Many modifications can be made, without departing from the scope defined by the scope of the set of claims.

Claims

REVENDICATIONS 1. Système de racle, destiné à un groupe imprimeur (2, 3), du type comprenant : - un support de racle (18) muni d'une lame (17), une arête (22) de la lame (17) étant apte à entrer en contact avec une surface périphérique d'un cylindre gravé (11),A squeegee system for a printing unit (2, 3) of the type comprising: - a squeegee support (18) provided with a blade (17), an edge (22) of the blade (17) being adapted to come into contact with a peripheral surface of an engraved cylinder (11), - un moyeu porteur (19), sur lequel est monté le support de racle (18),a carrier hub (19) on which the doctor blade support (18) is mounted, - une structure (21), assurant une fixation du moyeu porteur (19) au niveau d'un bâti (6) du groupe imprimeur (2, 3),- a structure (21), ensuring a fixing of the carrier hub (19) at a frame (6) of the printing unit (2, 3), - des moyens pour assurer un mouvement de va-et-vient (B) de la lame (17) à la surface périphérique du cylindre gravé (11), selon une direction sensiblement parallèle à l'axe de révolution (O) dudit cylindre gravé (11), etmeans for providing a reciprocating movement (B) of the blade (17) to the peripheral surface of the engraved cylinder (11), in a direction substantially parallel to the axis of revolution (O) of said engraved cylinder (11), and - un ou des éléments de poussée, entraînant un déplacement de la lame (17) en direction de ladite surface périphérique dudit cylindre gravé (11), caractériséone or more thrust elements, causing the blade (17) to move towards said peripheral surface of said engraved cylinder (11), characterized - en ce que les moyens pour assurer un mouvement de va-et-vient (B) de la lame (17) entraînent directement le support de racle (18) muni de la lame (17), etin that the means for reciprocating (B) the blade (17) directly drive the scraper support (18) provided with the blade (17), and - en ce que le ou les éléments de poussée s'appuient sur la structure (21) et déplacent le moyeu porteur (19) et le support de racle (18) muni de la lame- in that the one or more pushing elements rest on the structure (21) and move the carrier hub (19) and the blade holder (18) provided with the blade (17), de façon à conserver un contact constant de toute la longueur de l'arête (22) de la lame (17) avec la surface périphérique du cylindre gravé (11).(17), so as to maintain a constant contact of the entire length of the edge (22) of the blade (17) with the peripheral surface of the engraved cylinder (11). 2. Système selon la revendication 1, caractérisé en ce que le ou les éléments de poussée génèrent des forces s 'exerçant sur le moyeu porteur (19) et orientées dans le plan défini par la lame (17).2. System according to claim 1, characterized in that the thrust element or elements generate forces exerted on the carrier hub (19) and oriented in the plane defined by the blade (17). 3. Système selon la revendication 1 ou 2, caractérisé en ce qu'il comprend deux éléments de poussée, se présentant sous la forme de deux ressorts (32), disposés latéralement des deux côtés du moyeu porteur (19), de façon à pousser chaque côté dudit moyeu porteur (19), en direction de la surface périphérique du cylindre gravé (11). 3. System according to claim 1 or 2, characterized in that it comprises two thrust elements, in the form of two springs (32), arranged laterally on both sides of the carrier hub (19), so as to push each side of said carrier hub (19) towards the peripheral surface of the engraved cylinder (11). 4. Système selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend des moyens pour compenser un couple induit par le mouvement de va-et-vient (B) de la lame (17).4. System according to any one of the preceding claims, characterized in that it comprises means for compensating a torque induced by the back-and-forth movement (B) of the blade (17). 5. Système selon la revendication 4, caractérisé en ce que les moyens pour compenser le couple comprennent une rondelle (33), montée à une extrémité d'un axe de rotation (X) du moyeu porteur (19) permettant le réglage (A) d'un angle entre la lame (17) et la surface périphérique du cylindre gravé (11).5. System according to claim 4, characterized in that the means for compensating the torque comprise a washer (33) mounted at one end of an axis of rotation (X) of the carrier hub (19) for adjustment (A). an angle between the blade (17) and the peripheral surface of the engraved cylinder (11). 6. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens pour assurer un mouvement de va-et-vient (B) de la lame (17) comprennent un doigt d'impulsion (29) faisant saillie à partir du support de racle (18), entrant en contact avec des moyens de va-et-vient motorisés, et un ressort de rappel (31) positionné entre le support de racle (18) et le moyeu porteur (19).6. System according to any one of the preceding claims, characterized in that the means for a reciprocating movement (B) of the blade (17) comprise a pulse finger (29) projecting from doctor blade support (18), in contact with motorized reciprocating means, and a return spring (31) positioned between the doctor carrier (18) and the carrier hub (19). 7. Groupe imprimeur, caractérisé en ce qu'il est équipé avec un système de racle (16) selon l'une quelconque des revendications précédentes.7. Printing unit, characterized in that it is equipped with a squeegee system (16) according to any one of the preceding claims. 8. Machine d'impression en héliogravure, caractérisée en ce qu'elle comprend au moins un groupe imprimeur (2, 3) muni d'un système de racle (16) selon l'une quelconque des revendications 1 à 6. 8. Printing machine in rotogravure, characterized in that it comprises at least one printing unit (2, 3) provided with a doctor blade system (16) according to any one of claims 1 to 6.
EP08734819A 2007-04-27 2008-03-28 Doctor blade system for a printing unit, intended for an intaglio printing machine Active EP2139683B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08734819A EP2139683B1 (en) 2007-04-27 2008-03-28 Doctor blade system for a printing unit, intended for an intaglio printing machine

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07008586 2007-04-27
PCT/EP2008/002441 WO2008141694A1 (en) 2007-04-27 2008-03-28 Doctor blade system for a printing unit, intended for an intaglio printing machine
EP08734819A EP2139683B1 (en) 2007-04-27 2008-03-28 Doctor blade system for a printing unit, intended for an intaglio printing machine

Publications (2)

Publication Number Publication Date
EP2139683A1 true EP2139683A1 (en) 2010-01-06
EP2139683B1 EP2139683B1 (en) 2011-12-28

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Country Status (7)

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US (1) US8915184B2 (en)
EP (1) EP2139683B1 (en)
JP (1) JP5130577B2 (en)
CN (1) CN101668635B (en)
AT (1) ATE538928T1 (en)
ES (1) ES2375886T3 (en)
WO (1) WO2008141694A1 (en)

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KR101779025B1 (en) * 2013-04-02 2017-09-18 한화테크윈 주식회사 Squeezee apparatus of semi-automatic replacement blade
CN103331990B (en) * 2013-07-16 2014-12-17 大理美登印务有限公司 Improved type doctor blade locking and adjusting device for intaglio printing press
EP3445586B1 (en) * 2016-04-22 2024-04-17 Bobst Italia S.P.A. A doctor blade assembly with support in a rotogravure printing unit
CN106739479B (en) * 2016-12-12 2024-11-26 南京数维软件科技有限公司 A printing unit for a cloth printing line
CN106696458A (en) * 2016-12-12 2017-05-24 泉州市西格玛智能工业机械有限公司 Printing part of cloth printing assembly line
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FR3084013B1 (en) * 2018-07-18 2020-07-31 Bobst Lyon SQUEEGEE, SQUEEGEE CHAMBER AND PRINTER UNIT THUS EQUIPPED

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Also Published As

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US8915184B2 (en) 2014-12-23
JP5130577B2 (en) 2013-01-30
ATE538928T1 (en) 2012-01-15
CN101668635A (en) 2010-03-10
WO2008141694A1 (en) 2008-11-27
JP2010523380A (en) 2010-07-15
CN101668635B (en) 2012-08-08
EP2139683B1 (en) 2011-12-28
ES2375886T3 (en) 2012-03-07
US20100116158A1 (en) 2010-05-13

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