EP0224409A1 - Device for damping the mechanical vibrations of rotating cylinders with gaps, especially of plate and blanket cylinders of rotary offset printing machines - Google Patents

Device for damping the mechanical vibrations of rotating cylinders with gaps, especially of plate and blanket cylinders of rotary offset printing machines Download PDF

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Publication number
EP0224409A1
EP0224409A1 EP86402401A EP86402401A EP0224409A1 EP 0224409 A1 EP0224409 A1 EP 0224409A1 EP 86402401 A EP86402401 A EP 86402401A EP 86402401 A EP86402401 A EP 86402401A EP 0224409 A1 EP0224409 A1 EP 0224409A1
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EP
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Prior art keywords
damping
damping device
layers
cylinder
materials
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Granted
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EP86402401A
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German (de)
French (fr)
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EP0224409B1 (en
Inventor
Gérard Résidence "La Louvièrè" Rich
Bertrand Felly
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MacDermid Graphics Solutions Europe SAS
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Rollin SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/085—Cylinders with means for preventing or damping vibrations or shocks

Definitions

  • the present invention essentially relates to a device for damping the mechanical vibrations of throat-rotating cylinders, and in particular of the plate and blanket cylinders of rotary offset machines.
  • the present invention therefore aims to solve a new technical problem consisting in the supply of a solution making it possible to dampen the mechanical vibrations of throat-turning cylinders, in particular of plate and blanket cylinders of offset machines, flexography machines. and other machines, such as letterpress printing machines.
  • this technical problem must be solved by a particularly simple design solution, limiting manufacturing costs, while improving print quality and allowing it to increase the speed of rotation of the cylinders and therefore productivity.
  • the present invention provides a device for damping the mechanical vibrations of throat rotating cylinders, in particular of plate and blanket cylinders of offset machines, flexography machines and other machines, such as letterpress printing machines, said groove comprising a leading edge and a trailing edge, characterized in that it comprises one or more means for damping mechanical vibrations, arranged and fixed in one or more suitable housings provided at the periphery of the cylinder in at least an area where it is desired to dampen said vibrations.
  • at least one of these zones is formed by the leading edge and / or the trailing edge of said groove.
  • the abovementioned damping means consists of an insert in the form of a lamellar or laminated part formed by the stack of layers of suitable materials adhered together.
  • certain layers are made at least partially from flexible materials in compression, and certain other layers or the remaining layers are made at least partially from rigid materials in compression.
  • the layers of flexible materials and the layers of rigid materials are alternated over at least certain zones which are intended to constitute damping zones.
  • a plurality of discrete housings spaced axially and / or circumferentially between them on the aforementioned edge of the groove.
  • the aforementioned housings occupy a predetermined arc whose angle at the center is of the order of 5 to 20 °, preferably of the order of 10 to 15 °.
  • one or more associated housing and inserts are also provided in other sectors of the cylinder, in particular in a sector which will be in abutment against a counter-cylinder when the aforementioned groove comes into contact with another cylinder. associated.
  • one or more housings are provided over the entire surface of the cylinder.
  • the dimension of the above-mentioned housings can vary axially and / or circumferentially to determine a variable profile of compressive stiffness.
  • the thickness of the layers of flexible materials can be variable axially and / or circumferentially to further determine a variable profile of compressive stiffness.
  • the aforementioned inserts comprise orifices passing through the adhered layers so as to determine a variable profile of compressive stiffness.
  • These orifices can be of different dimensions and be produced according to an appropriate distribution.
  • the orifice layer can be replaced by an alveolar or cellular layer.
  • the housings extend over all or part of the length of the cylinder and occupy a limited sector defining an angle at the center of the order of 5 to 20 °, preferably of the order of 10 to 15 °.
  • Compression preload can also be applied to the laminate insert to increase dynamic performance.
  • the different layers of flexible deformable materials can be made of different materials with elastic modules varying from 0.1 MPa to 10,000 MPa and chosen from the whole range of elastomeric materials (crosslinked or vulcanized, thermoplastic or thermostable), or thermosetting polymeric, thermoplastic or thermostable and combinations thereof.
  • the nature of the aforementioned flexible material may be variable axially and / or circumferentially to determine a variable profile of compressive stiffness.
  • the rigid material of the inserts may consist of a metal or a structural composite or a fibrous reinforcement such as fabrics, mats or combinations of these materials.
  • the compressive rigidity can be adjusted by varying the modulus of the flexible material, again by varying the modulus of the flexible material, again by varying the thickness of the layers of flexible materials or else by varying the dimension of the housing and therefore the insert, or even by the presence of orifices passing through at least certain adhered layers of the inserts, or finally the nature of the aforementioned flexible material can be axially and / or circumferentially variable to determine a profile of stiffness in compression.
  • the mechanical impulse has a frequency content such that the first mode of bending of these is excited with an amplification close to the theoretical maximum, which has been verified by test or by dynamic calculation transient.
  • the device according to the invention carrying out the damping of mechanical vibrations results in minimizing or even eliminating printing defects which makes it possible to increase the speed of rotation and therefore to obtain a gain in productivity.
  • An offset machine comprises printing blocks made up of a set of cylinders (1, 2) and rollers 6.
  • Offset printing is based on the balance between two opposing fluid films: water and ink with a thickness of 1 to 3 microns. It consists in transferring, via a blanket 7 fixed to the cylinder 2, an image taken from a plate 8, in hollow or in relief, fixed on its respective support cylinder 1.
  • the fixing of the plate 8 and the blanket 7 to the cylinder is obtained by means of fixing devices embedded in the cylinders (not shown) by introducing them into a groove 3, 4 provided respectively in each cylinder 1, 2 in line with these devices.
  • the transfer is obtained by bringing the different cylinders and rollers into contact with a specific regulated pressure.
  • each groove 3, 4 constitutes an annoying discontinuity because it generates mechanical vibrations and irregularities but it is necessary for the assembly and disassembly of the plates (8) and blankets (7).
  • a vibration damping device according to the invention, characterized in that it comprises one or more damping means 10, 12, arranged in one or more respective housings 18, 20, suitable provided at the leading edge 26 and / or the trailing edge 28 of said groove 4.
  • the aforementioned damping means 10, 12 consists of an insert in the form of a lamellar or laminated part formed by the stack layers of suitable materials, bonded to each other as can easily be seen from the consideration of Figure 2.
  • certain layers 30, 32, 34 are made at least partially of flexible materials in compression while certain other layers or the remaining layers 31, 33, 35, 37 are made at least partially of rigid materials in compression.
  • a zone 30a, 32a, 34a of each layer 30, 32, 34 can be made of rigid material in compression to constitute a transition zone as well as a device facilitating fixing to the cylinder.
  • provision may be made for partial or complete alternation between the layers of flexible materials and the layers of rigid materials.
  • the outer layer 37 intended to be rectified to the exact dimensions of the cylinder is a layer made of rigid material in compression usually a metal or alloy.
  • these housings can also be provided in certain sectors of the cylinder. In particular, it is possible to provide housings over the entire surface of the cylinder.
  • the dimension of the housings and therefore of the inserts can vary axially and / or circumferentially to determine a profile compression stiffness variable.
  • FIG. 3 shows an example of drilling the laminated layers.
  • the diameter dimension of the orifices 14, 16, 22 is variable and clearly visible, this variation being possible axially and circumferentially, as shown in FIG. 3.
  • the shape of the orifices can be arbitrary but it is preferred for questions of simple geometry and manufacturing costs, that the orifices 14, 16, 22 have a cylindrical shape with circular section.
  • different layers of flexible materials deformable in compression 30, 32, 34 can be made of different materials with elastic modules varying from 0.1 MPa to 10,000 MPa and chosen from the whole range of elastomeric materials (crosslinked or vulcanized, thermoplastic or thermostable) or thermosetting polymer, thermoplastic or thermostable, and combinations thereof, having adequate modulus and damping in the range of temperatures and frequency of use on machines.
  • the layers of flexible materials can be made with elastomers or polymers of different module and damping capacity while the flexible material itself can be a combination of an arbitrary number of different elastomeric and polymeric materials, this is particularly useful in the circumferential direction.
  • the flexible material can be cellular or alveolar.
  • the rigid material of the layers of rigid material 31, 33, 35, 37 may consist of a metal or an alloy, or a structural composite or a fibrous reinforcement such as fabric, mat or combinations of these materials. .
  • these different layers are bonded together so as to constitute a single laminated insert.
  • the absolute value and the evolution in the axial and / or circumferential direction of the modulus of compression stiffness are adjusted on demand by the presence of the orifices in the insert such as the orifices 14, 16, 22, which can be seen clearly in FIG. 2, which can be at least partly through, with the exception of the outer layer, as shown.
  • inserts are rigidly fixed to the cylinder, in their respective housings by any suitable means, for example by gluing and / or by means of countersunk screws 46 passing through suitable orifices 48 passing through, and ending in blind holes 50 provided in the cylinder.
  • FIG 4 there is shown the shape of the pulse caused by the passage of grooves in the conventional case (A) and in the case of the device according to the invention (B) on a blanket cylinder (2).
  • the device according to the invention also makes it possible to obtain a graduated variation of the rigidity in the circumferential direction which makes it possible to modify the shape of the pulse at will and consequently to improve the vibratory response at will. This results in a significant improvement in depreciation.
  • FIG. 5 precisely shows the vibrational response obtained by transient dynamic calculation step by step, in the conventional case (curve A) leading to printing defects and in the case of the use of the damping device according to the invention (curve B) for a blanket cylinder (2) of an offset machine.
  • curve A the conventional case
  • curve B the damping device according to the invention
  • the shape of the curve is quite conclusive.
  • the present invention therefore provides all the technical advantages mentioned above. It can also be observed that the modular solution proposed according to the invention allows the use of standardized parts.
  • the geometry is simple and lowers manufacturing costs.
  • the mechanical strength is satisfactory and the fatigue strength is excellent. An improved impression will be obtained practically without defects.
  • the pressure variation in the nip between the cylinders, generated by mechanical vibrations, is partially supported by the elastic damping device according to the invention, which is very favorable to the regularity of the printing.
  • a compression preload can be applied to the laminated insert, to increase the dynamic performances.

Abstract

L'invention concerne un dispositif d'amortissement des vibrations mécaniques des cylindres tournants à gorge, en particulier des machines d'impression offset.The invention relates to a device for damping the mechanical vibrations of rotating grooved cylinders, in particular offset printing machines.

Le dispositif est caractérisé en ce qu'il comprend un ou plusieurs moyens d'amortissement (10, 12) des vibrations mécaniques, disposés dans un ou plusieurs logements appropriés (18, 20) prévus au niveau du bord d'attaque (26) et/ou du bord de fuite (28) de la gorge (4) du cylindre (2). De préférence, ces moyens d'amortissement sont constitués par un insert sous forme d'une pièce lamellaire formée par un empilement de couches de matériaux appropriés adhérisées entre elles.

Figure imgaf001
The device is characterized in that it comprises one or more means for damping (10, 12) mechanical vibrations, arranged in one or more suitable housings (18, 20) provided at the leading edge (26) and / or the trailing edge (28) of the groove (4) of the cylinder (2). Preferably, these damping means consist of an insert in the form of a lamellar part formed by a stack of layers of suitable materials bonded together.
Figure imgaf001

Description

La présente invention concerne essentiellement un dispositif d'amortissement des vibrations mécaniques des cylindres tournants à gorge, et notamment des cylindres plaque et blanchet des machines offset rotatives.The present invention essentially relates to a device for damping the mechanical vibrations of throat-rotating cylinders, and in particular of the plate and blanket cylinders of rotary offset machines.

Le problème des stries sur machine offset rapides à simple développement est bien connu des imprimeurs.The problem of streaks on rapid single-stage offset machines is well known to printers.

Il est dû aux vibrations mécaniques des cylindres plaque et blanchet excitées par les passages de gorge à chaque rotation de ceux-ci. Ces vibrations provoquent des variations de pression dans la zone de pincement qui affectent la qualité d'impression et le défaut généré est très souvent rédhibitoire. Par ailleurs, ce défaut est le facteur limitant de la vitesse et donc de la productivité des machines et toute amélioration dans cette voie est vecteur de progrès.It is due to the mechanical vibrations of the plate and blanket cylinders excited by the groove passages at each rotation of these. These vibrations cause pressure variations in the nip which affect the print quality and the defect generated is very often unacceptable. Furthermore, this defect is the limiting factor in the speed and therefore in the productivity of the machines and any improvement in this direction is a vector of progress.

Il n'y a pas de palliatif mécanique simple à cause de la position défavorable du mode fondamental des cylindres en flexion qui ne peut être déplacé sans avoir recours à des matériaux non métalliques très coûteux tels que les composites carbone-époxy qui ont des modules spécifiques nettement démarqués des valeurs classiques pour les métaux.There is no simple mechanical palliative because of the unfavorable position of the fundamental mode of the bending cylinders which cannot be moved without having to use very expensive non-metallic materials such as carbon-epoxy composites which have specific modules. clearly distinguished from conventional values for metals.

Ainsi, la présente invention a donc pour but de résoudre un nouveau problème technique consistant en la fourniture d'une solution permettant d'amortir les vibrations mécaniques des cylindres tournant à gorge, notamment des cylindres plaque et blanchet des machines offset, des machines de flexographie et autre machines, telles que machines à impression typographique.Thus, the present invention therefore aims to solve a new technical problem consisting in the supply of a solution making it possible to dampen the mechanical vibrations of throat-turning cylinders, in particular of plate and blanket cylinders of offset machines, flexography machines. and other machines, such as letterpress printing machines.

De préférence, ce problème technique doit être résolu par une solution de conception particulièrement simple, limitant les coûts de fabrication, tout en améliorant la qualité d'impression et lui permettant d'augmenter la vitesse de rotation des cylindres et donc de la productivité.Preferably, this technical problem must be solved by a particularly simple design solution, limiting manufacturing costs, while improving print quality and allowing it to increase the speed of rotation of the cylinders and therefore productivity.

Ce nouveau problème technique est résolu pour la première fois par la présente invention.This new technical problem is solved for the first time by the present invention.

Ainsi, selon un premier aspect, la présente invention fournit un dispositif d'amortissement des vibrations mécaniques des cylindres tournants à gorge, notamment des cylindres plaque et blanchet des machines offset, des machines de flexographie et autres machines, telles que machines à impression typographique, ladite gorge comprenant un bord d'attaque et un bord de fuite, caractérisé en ce qu'il comprend un ou plusieurs moyens d'amortissement des vibrations mécaniques, disposés et fixés dans un ou plusieurs logements appropriés prévus à la périphérie du cylindre dans au moins une zone où on désire amortir lesdites vibrations. De préférence, au moins une de ces zones est constituée par le bord d'attaque et/ou le bord de fuite de ladite gorge.Thus, according to a first aspect, the present invention provides a device for damping the mechanical vibrations of throat rotating cylinders, in particular of plate and blanket cylinders of offset machines, flexography machines and other machines, such as letterpress printing machines, said groove comprising a leading edge and a trailing edge, characterized in that it comprises one or more means for damping mechanical vibrations, arranged and fixed in one or more suitable housings provided at the periphery of the cylinder in at least an area where it is desired to dampen said vibrations. Preferably, at least one of these zones is formed by the leading edge and / or the trailing edge of said groove.

Selon un mode préféré, le moyen d'amortissement précité est constitué par un insert sous forme d'une pièce lamellaire ou lamifiée formée par l'empilement de couches de matériaux appropriés adhérisées entre elles.According to a preferred embodiment, the abovementioned damping means consists of an insert in the form of a lamellar or laminated part formed by the stack of layers of suitable materials adhered together.

Avantageusement, certaines couches sont réalisées au moins partiellement en matériaux souples en compression, et certaines autres couches ou les couches restantes son réalisées au moins partiellement en matériaux rigides en compression.Advantageously, certain layers are made at least partially from flexible materials in compression, and certain other layers or the remaining layers are made at least partially from rigid materials in compression.

Selon un mode de réalisation préféré, les couches en matériaux souples et les couches en matériaux rigides sont alternées sur au moins certaines zones qui sont destinées à constituer des zones d'amortissement.According to a preferred embodiment, the layers of flexible materials and the layers of rigid materials are alternated over at least certain zones which are intended to constitute damping zones.

Selon un mode de réalisation préféré, on prévoit une pluralité de logements discrets espacés axialement et/ou circonférientellement entre eux sur le bord précité de la gorge.According to a preferred embodiment, there is provided a plurality of discrete housings spaced axially and / or circumferentially between them on the aforementioned edge of the groove.

Selon un mode de réalisation particulier, les logements précités occupent un arc de cercle prédéterminé dont l'angle au centre est de l'ordre de 5 à 20°, de préférence de l'ordre de 10 à 15°.According to a particular embodiment, the aforementioned housings occupy a predetermined arc whose angle at the center is of the order of 5 to 20 °, preferably of the order of 10 to 15 °.

Selon un autre mode de réalisation, on prévoit également un ou plusieurs logements et inserts associés dans d'autres secteurs du cylindre en particulier dans un secteur qui se trouvera en appui contre un contre-cylindre lorsque la gorge précitée vient en contact avec un autre cylindre associé.According to another embodiment, one or more associated housing and inserts are also provided in other sectors of the cylinder, in particular in a sector which will be in abutment against a counter-cylinder when the aforementioned groove comes into contact with another cylinder. associated.

Selon encore un autre mode de réalisation, on prévoit un ou plusieurs logements sur toute la surface du cylindre.According to yet another embodiment, one or more housings are provided over the entire surface of the cylinder.

Naturellement, dans ces logements on dispose les inserts précités constituant les moyens d'amortissement.Naturally, in these housings there are the aforementioned inserts constituting the damping means.

Selon encore un autre mode de réalisation du dispositif selon l'invention, la dimension des logements précités peut varier axialement et/ou circonférentiellement pour déterminer un profil variable de rigidité en compression.According to yet another embodiment of the device according to the invention, the dimension of the above-mentioned housings can vary axially and / or circumferentially to determine a variable profile of compressive stiffness.

Selon un autre mode de réalisation de l'invention, l'épaisseur des couches de matériaux souples peut être variable axialement et/ou circonférentiellement pour déterminer encore un profil variable de rigidité en compression.According to another embodiment of the invention, the thickness of the layers of flexible materials can be variable axially and / or circumferentially to further determine a variable profile of compressive stiffness.

Selon encore un autre mode de réalisation de l'invention, les inserts précités comprennent des orifices traversants les couches adhérisées de manière à déterminer un profil variable de rigidité en compression. Ces orifices peuvent être de dimension différente et être réalisés selon une répartition appropriée. La couche à orifices peut être remplacée par une couche alvéolaire ou cellulaire.According to yet another embodiment of the invention, the aforementioned inserts comprise orifices passing through the adhered layers so as to determine a variable profile of compressive stiffness. These orifices can be of different dimensions and be produced according to an appropriate distribution. The orifice layer can be replaced by an alveolar or cellular layer.

Selon un mode de réalisation particulier actuellement préféré, les logements s'étendent sur toute ou partie de la longueur du cylindre et occupent un secteur limité définissant un angle au centre de l'ordre de 5 à 20°, de préférence de l'ordre de 10 à 15°.According to a particular currently preferred embodiment, the housings extend over all or part of the length of the cylinder and occupy a limited sector defining an angle at the center of the order of 5 to 20 °, preferably of the order of 10 to 15 °.

On peut également appliquer une précontrainte de compression à l'insert lamifié pour augmenter les performances dynamiques.Compression preload can also be applied to the laminate insert to increase dynamic performance.

Les différentes couches de matériaux souples déformables peuvent être constituées de matériaux différents avec des modules élastiques variant de 0,1MPa à 10 000 MPa et choisis dans toute la gamme des matériaux élastomères (réticulés ou vulcanisés, thermoplastiques ou thermostables), ou polymériques thermodurcissables, thermoplastiques ou thermostables ainsi que les combinaisons de ceux-ci. La nature du matériau souple précitée peut être variable axialement et/ou circonférentiellement pour déterminer un profil variable de rigidité en compression.The different layers of flexible deformable materials can be made of different materials with elastic modules varying from 0.1 MPa to 10,000 MPa and chosen from the whole range of elastomeric materials (crosslinked or vulcanized, thermoplastic or thermostable), or thermosetting polymeric, thermoplastic or thermostable and combinations thereof. The nature of the aforementioned flexible material may be variable axially and / or circumferentially to determine a variable profile of compressive stiffness.

Le matériau rigide des inserts peut être constitué par un métal ou un composite de structure ou un renfort fibreux tel que tissus, mats ou des combinaisons de ces matériaux.The rigid material of the inserts may consist of a metal or a structural composite or a fibrous reinforcement such as fabrics, mats or combinations of these materials.

Tous ces matériaux sont choisis de manière à obtenir une rigidité en compression ajustable dans une gamme large pour obtenir l'effet recherché d'amortissement des vibrations mécaniques.All these materials are chosen so as to obtain an adjustable compressive stiffness over a wide range to obtain the desired effect of damping mechanical vibrations.

Ainsi, on peut ajuster la rigidité en compression par variation du module du matériau souple, encore par variation du module du matériau souple, encore par variation de l'épaisseur des couches de matériaux souples ou encore par variation de la dimension du logement et donc de l'insert, ou encore par la présence d'orifices traversant au moins certaines couches adhérisées des inserts, ou enfin la nature du matériau souple précitée peut être variable axialement et/ou circonférentiellement pour déterminer un profil de rigidité en compression.Thus, the compressive rigidity can be adjusted by varying the modulus of the flexible material, again by varying the modulus of the flexible material, again by varying the thickness of the layers of flexible materials or else by varying the dimension of the housing and therefore the insert, or even by the presence of orifices passing through at least certain adhered layers of the inserts, or finally the nature of the aforementioned flexible material can be axially and / or circumferentially variable to determine a profile of stiffness in compression.

Ainsi, on obtient selon l'invention une modification importante de l'impulsion mécanique au passage de la gorge, ce qui réduit le facteur d'amplification dynamique de la réponse transitoire des cylindres.Thus, according to the invention, a significant modification of the mechanical impulse when passing through the groove is obtained, which reduces the dynamic amplification factor of the transient response of the cylinders.

Or, dans la configuration actuelle des cylindres, l'impulsion mécanique a un contenu en fréquence tel que le premier mode de flexion de ceux-ci est excité avec une amplification proche du maximum théorique, ce qui a été vérifié par essai ou par calcul dynamique transitoire.However, in the current configuration of the cylinders, the mechanical impulse has a frequency content such that the first mode of bending of these is excited with an amplification close to the theoretical maximum, which has been verified by test or by dynamic calculation transient.

D'autre part, on obtient, avec le dispositif selon l'invention, un amortissement additionnel par le choix d'une rigidité adaptée et d'une formulation du matériau souple ad hoc avec un angle de perte important dans la gamme de température et de fréquence utile pour les applications envisagées.On the other hand, there is obtained, with the device according to the invention, additional damping by the choice of an adapted rigidity and of a formulation of the flexible material ad hoc with a large loss angle in the range of temperature and useful frequency for the envisaged applications.

Ainsi, le dispositif selon l'invention réalisant l'amortissement des vibrations mécaniques aboutit à minimiser ou même éliminer les défauts d'impression ce qui permet d'augmenter la vitesse de rotation et donc d'obtenir un gain de productivité.Thus, the device according to the invention carrying out the damping of mechanical vibrations results in minimizing or even eliminating printing defects which makes it possible to increase the speed of rotation and therefore to obtain a gain in productivity.

D'autres buts, caractéristiques et avantages de l'invention apparaîtront à la lumière de la description explicative qui va suivre faite en référence aux dessins annexés donnés simplement à titre d'illustration et qui ne sauraient donc en aucune façon limiter la portée de l'invention. Dans les dessins :

  • - La figure 1 représente schématiquement et en coupe la partie essentielle d'une machine d'impression offset à simple développement ; la gorge étant représentée surdimensionée pour des questions de clarté.
  • - La figure 2 représente une vue en coupe partielle réalisée au niveau de la gorge d'un mode de réalisation d'un dispositif selon l'invention ;
  • - La figure 3 représente une vue selon la ligne de trace III-III de la figure 2 du bord d'attaque de la gorge ;
  • - La figure 4 représente l'allure de l'impulsion provoquée par le passage de la gorge du cylindre dans le cas d'un cylindre blanchet classique (A) et dans le cas de l'utilisation du dispositif d'amortissement selon l'invention réalisé sur le même cylindre blanchet (B) ; et
  • - La figure 5 représente la réponse vibratoire obtenue par calcul dynamique transitoire pas-à-pas, dans le cas d'un cylindre blanchet (A) conduisant à des défauts d'impression et dans le cas de l'utilisation du dispositif d'amortissement selon l'invention (B) également pour un cylindre blanchet de machines offset.
Other objects, characteristics and advantages of the invention will appear in the light of the explanatory description which will follow made with reference to the accompanying drawings given simply by way of illustration and which therefore cannot in any way limit the scope of the invention. In the drawings:
  • - Figure 1 shows schematically and in section the essential part of a single development offset printing machine; the throat being shown oversized for clarity.
  • - Figure 2 shows a partial sectional view made at the throat of an embodiment of a device according to the invention;
  • - Figure 3 shows a view along the trace line III-III of Figure 2 of the leading edge of the groove;
  • - Figure 4 shows the shape of the pulse caused by the passage of the groove of the cylinder in the case of a conventional blanket cylinder (A) and in the case of the use of the damping device according to the invention made on the same blanket cylinder (B); and
  • - Figure 5 shows the vibrational response obtained by transient dynamic calculation step by step, in the case of a blanket cylinder (A) leading to printing defects and in the case of the use of the damping device according to the invention (B) also for a blanket cylinder of offset machines.

En référence à la figure 1, on illustre le cas particulier de l'impression offset sur machines rotatives.With reference to FIG. 1, the specific case of offset printing on rotary machines is illustrated.

Une machine offset comprend des blocs d'impression constitués d'un ensemble de cylindres (1, 2) et de rouleaux 6.An offset machine comprises printing blocks made up of a set of cylinders (1, 2) and rollers 6.

L'impression offset est basée sur l'équilibre entre deux films de fluide antagonistes : l'eau et l'encre d'une épaisseur de 1 à 3 microns. Elle consiste à transférer par l'intermédiaire d'un blanchet 7 fixé au cylindre 2, une image prélevée sur une plaque 8, en creux ou en relief, fixée sur son cylindre support respectif 1.Offset printing is based on the balance between two opposing fluid films: water and ink with a thickness of 1 to 3 microns. It consists in transferring, via a blanket 7 fixed to the cylinder 2, an image taken from a plate 8, in hollow or in relief, fixed on its respective support cylinder 1.

La fixation de la plaque 8 et du blanchet 7 au cylindre est obtenue par l'intermédiaire de dispositifs de fixation noyés dans les cylindres (non représentés) en les introduisants dans une gorge 3, 4 prévue respectivement dans chaque cylindre 1, 2 au droit de ces dispositifs.The fixing of the plate 8 and the blanket 7 to the cylinder is obtained by means of fixing devices embedded in the cylinders (not shown) by introducing them into a groove 3, 4 provided respectively in each cylinder 1, 2 in line with these devices.

Le transfert est obtenu en mettant en contact avec une pression spécifique régulée les différents cylindres et rouleaux.The transfer is obtained by bringing the different cylinders and rollers into contact with a specific regulated pressure.

Comme cela a été précédemment mentionné, la qualité de l'impression est conditionnée par la régularité des films d'eau et d'encre et la constance de la pression. Chaque gorge 3, 4 constitue une discontinuité gênante car elle est génératrice de vibrations mécaniques et d'irrégularités mais elle est nécessaire pour le montage et le démontage des plaques (8) et blanchets (7).As previously mentioned, the quality of the printing is conditioned by the regularity of the films of water and ink and the constancy of the pressure. Each groove 3, 4 constitutes an annoying discontinuity because it generates mechanical vibrations and irregularities but it is necessary for the assembly and disassembly of the plates (8) and blankets (7).

En référence aux figures 2 et 3, on peut voir qu'un tel cylindre, par exemple 2, comportant donc une gorge 4 a été modifié pour comporter un dispositif d'amortissement des vibrations selon l'invention, caractérisé en ce qu'il comprend un ou plusieurs moyens d'amortissement 10, 12, disposés dans un ou plusieurs logements respectifs 18, 20, appropriés prévus au niveau du bord d'attaque 26 et/ou du bord de fuite 28 de ladite gorge 4.Referring to Figures 2 and 3, it can be seen that such a cylinder, for example 2, therefore comprising a groove 4 has been modified to include a vibration damping device according to the invention, characterized in that it comprises one or more damping means 10, 12, arranged in one or more respective housings 18, 20, suitable provided at the leading edge 26 and / or the trailing edge 28 of said groove 4.

Selon un mode de réalisation actuellement préféré, le moyen d'amortissement précité 10, 12, est constitué par un insert sous forme d'une pièce lamellaire ou lamifiée formée par l'empilement de couches de matériaux appropriés, adhérisées entre elles comme cela se conçoit bien à partir de la considération de la figure 2.According to a currently preferred embodiment, the aforementioned damping means 10, 12, consists of an insert in the form of a lamellar or laminated part formed by the stack layers of suitable materials, bonded to each other as can easily be seen from the consideration of Figure 2.

Selon un mode de réalisation particulier avantageux, certaines couches 30, 32, 34 sont réalisées au moins partiellement en matériaux souples en compression tandis que certaines autres couches ou les couches restantes 31, 33, 35, 37 sont réalisées au moins partiellement en matériaux rigides en compression. Ainsi, une zone 30a, 32a, 34a de chaque couche 30, 32, 34 peut être en matériau rigide en compression pour constituer une zone de transition ainsi qu'un dispositif facilitant la fixation sur le cylindre.According to a particular advantageous embodiment, certain layers 30, 32, 34 are made at least partially of flexible materials in compression while certain other layers or the remaining layers 31, 33, 35, 37 are made at least partially of rigid materials in compression. Thus, a zone 30a, 32a, 34a of each layer 30, 32, 34 can be made of rigid material in compression to constitute a transition zone as well as a device facilitating fixing to the cylinder.

Selon un mode de réalisation préféré, on peut prévoir une alternance partielle ou complète entre les couches de matériaux souples et les couches de matériaux rigides.According to a preferred embodiment, provision may be made for partial or complete alternation between the layers of flexible materials and the layers of rigid materials.

On observera que la couche externe 37 destinée à être rectifiée aux cotes exactes du cylindre est une couche réalisée en matériau rigide en compression habituellement un métal ou alliage.It will be observed that the outer layer 37 intended to be rectified to the exact dimensions of the cylinder is a layer made of rigid material in compression usually a metal or alloy.

Selon une autre caractéristique de l'invention, ces logements peuvent également être prévus dans certains secteurs du cylindre. En particulier, on peut prévoir des logements sur toute la surface du cylindre.According to another characteristic of the invention, these housings can also be provided in certain sectors of the cylinder. In particular, it is possible to provide housings over the entire surface of the cylinder.

Selon encore une autre caractéristique de l'invention, la dimension des logements et donc des inserts peut varier axialement et/ou circonférentiellement pour déterminer un profil variable de rigidité en compression.According to yet another characteristic of the invention, the dimension of the housings and therefore of the inserts can vary axially and / or circumferentially to determine a profile compression stiffness variable.

On a représenté à la figure 3 un exemple de perçage des couches lamifiées. La dimension en diamètre des orifices 14, 16, 22 est variable et clairement visible, cette variation étant possible axialement et circonférentiellement, comme représenté à la figure 3. D'autre part, la forme des orifices peut être quelconque mais on préfère pour des questions de géométrie simple et des coûts de fabrication, que les orifices 14, 16, 22, présentent une forme cylindrique à section circulaire.FIG. 3 shows an example of drilling the laminated layers. The diameter dimension of the orifices 14, 16, 22 is variable and clearly visible, this variation being possible axially and circumferentially, as shown in FIG. 3. On the other hand, the shape of the orifices can be arbitrary but it is preferred for questions of simple geometry and manufacturing costs, that the orifices 14, 16, 22 have a cylindrical shape with circular section.

D'autre part, différentes couches de matériaux souples déformables en compression 30, 32, 34, peuvent être constituées de matériaux différents avec des modules élastiques variant de 0,1 MPa à 10 000 MPa et choisis dans toute la gamme des matériaux élastomères (réticulés ou vulcanisés, thermoplastiques ou thermostables) ou polymériques thermodurcissables, thermoplastiques ou thermostables, ainsi que les combinaisons de ceux-ci, présentant un module et un amortissement adéquats dans la gamme de températures et de fréquence d'utilisation sur les machines.On the other hand, different layers of flexible materials deformable in compression 30, 32, 34, can be made of different materials with elastic modules varying from 0.1 MPa to 10,000 MPa and chosen from the whole range of elastomeric materials (crosslinked or vulcanized, thermoplastic or thermostable) or thermosetting polymer, thermoplastic or thermostable, and combinations thereof, having adequate modulus and damping in the range of temperatures and frequency of use on machines.

Naturellement, les couches de matériaux souples peuvent être réalisées avec des élastomères ou des polymères de module et de capacité d'amortissement différents tandis que le matériau souple lui-même peut être une combinaison d'un nombre arbitraire de matériaux élastomériques et polymériques différents, ceci est particulièrement utile dans le sens circonférentiel. Le matériau souple peut être cellulaire ou alvéolaire.Naturally, the layers of flexible materials can be made with elastomers or polymers of different module and damping capacity while the flexible material itself can be a combination of an arbitrary number of different elastomeric and polymeric materials, this is particularly useful in the circumferential direction. The flexible material can be cellular or alveolar.

D'autre part, le matériau rigide des couches en matériau rigide 31, 33, 35, 37 peut être constitué par un métal ou un alliage, ou un composite de structure ou un renfort fibreux tel que tissu, mat ou des combinaisons de ces matériaux.On the other hand, the rigid material of the layers of rigid material 31, 33, 35, 37 may consist of a metal or an alloy, or a structural composite or a fibrous reinforcement such as fabric, mat or combinations of these materials. .

Naturellement, comme mentionné précédemment, ces différentes couches sont adhérisées entre elles de manière à constituer un insert lamellé unique.Naturally, as mentioned previously, these different layers are bonded together so as to constitute a single laminated insert.

En outre, selon une autre caractéristique importante de l'invention, on ajuste à la demande la valeur absolue et l'évolution dans le sens axial et/ou circonférentiel du module de rigidité en compression par la présence des orifices dans l'insert tels que les orifices 14, 16, 22, que l'on voit bien à la figure 2, qui peuvent être au moins en partie traversants, à l'exception de la couche externe, comme représentés.In addition, according to another important characteristic of the invention, the absolute value and the evolution in the axial and / or circumferential direction of the modulus of compression stiffness are adjusted on demand by the presence of the orifices in the insert such as the orifices 14, 16, 22, which can be seen clearly in FIG. 2, which can be at least partly through, with the exception of the outer layer, as shown.

Ces inserts sont fixés rigidement au cylindre, dans leurs logements respectifs par tout moyen approprié, par exemple par collage et/ou par l'intermédiaire de vis noyées 46 passant dans des orifices appropriés 48 traversant, et aboutissant dans des trous borgnes 50 prévus dans le cylindre.These inserts are rigidly fixed to the cylinder, in their respective housings by any suitable means, for example by gluing and / or by means of countersunk screws 46 passing through suitable orifices 48 passing through, and ending in blind holes 50 provided in the cylinder.

Après fixation des inserts sur le cylindre, la surface des inserts est rectifiée ultérieurement aux cotes exactes et très précises exigées dans ce type de machine.After fixing the inserts on the cylinder, the surface of the inserts is subsequently rectified to the exact and very precise dimensions required in this type of machine.

On conçoit ainsi qu'avec le dispositif selon l'invention, on réalise une modification mineure des cylindres de machine de sorte que ce dispositif selon l'invention peut être monté sans aucun problème sur les cylindres des machines existantes avec des modifications mineures et avec un encombrement limité.It is thus understood that with the device according to the invention, a minor modification of the machine cylinders is carried out so that this device according to the invention can be mounted without any problem on the cylinders of existing machines with minor modifications and with a limited space.

Ceci est applicable aux cylindres plaque et/ou aux cylindres blanchet d'une manière générale à tout cylindre tournant à gorge, en particulier des machines offset, des machines de flexographie, et autres machines, telles que machines à impression typographique.This is applicable to plate rolls and / or blanket rolls in general to any grooved turning cylinder, in particular offset machines, flexography machines, and other machines, such as letterpress printing machines.

A la figure 4, on a représenté l'allure de l'impulsion provoquée par le passage de gorges dans le cas classique (A) et dans le cas du dispositif selon l'invention (B) sur un cylindre blanchet (2). On voit la différence essentielle qui est obtenue avec le dispositif selon l'invention. Le dispositif selon l'invention permet en outre d'obtenir une variation graduée de la rigidité dans le sens circonférentiel ce qui permet de modifier la forme de l'impulsion à volonté et par conséquent d'améliorer la réponse vibratoire à volonté. On obtient ainsi une amélioration significative de l'amortissement.In Figure 4, there is shown the shape of the pulse caused by the passage of grooves in the conventional case (A) and in the case of the device according to the invention (B) on a blanket cylinder (2). We see the essential difference which is obtained with the device according to the invention. The device according to the invention also makes it possible to obtain a graduated variation of the rigidity in the circumferential direction which makes it possible to modify the shape of the pulse at will and consequently to improve the vibratory response at will. This results in a significant improvement in depreciation.

La figure 5 montre justement la réponse vibratoire obtenue par calcul dynamique transitoire pas-à-pas, dans le cas classique (courbe A) conduisant à des défauts d'impression et dans le cas de l'emploi du dispositif d'amortissement selon l'invention (courbe B) pour un cylindre blanchet (2) de machine offset. La forme de la courbe est tout à fait concluante.FIG. 5 precisely shows the vibrational response obtained by transient dynamic calculation step by step, in the conventional case (curve A) leading to printing defects and in the case of the use of the damping device according to the invention (curve B) for a blanket cylinder (2) of an offset machine. The shape of the curve is quite conclusive.

La présente invention apporte donc bien tous les avantages techniques précédemment mentionnés. On peut observer en outre que la solution modulaire proposée selon l'invention permet l'utilisation de pièces standarisées. La géométrie est simple et permet d'abaisser les coûts de fabrication. La tenue mécanique est satisfaisante et la tenue à la fatigue est excellente. On obtiendra une impression améliorée pratiquement sans défauts.The present invention therefore provides all the technical advantages mentioned above. It can also be observed that the modular solution proposed according to the invention allows the use of standardized parts. The geometry is simple and lowers manufacturing costs. The mechanical strength is satisfactory and the fatigue strength is excellent. An improved impression will be obtained practically without defects.

La variation de pression dans la zone de pincement entre les cylindres, générée par les vibrations mécaniques, est supportée partiellement par le dispositif d'amortissement élastique selon l'invention, ce qui est très favorable à la régularité de l'impression.The pressure variation in the nip between the cylinders, generated by mechanical vibrations, is partially supported by the elastic damping device according to the invention, which is very favorable to the regularity of the printing.

Comme mentionné précédemment, on peut appliquer une précontrainte de compression à l'insert lamifié, pour augmenter les performances dynamiques.As mentioned above, a compression preload can be applied to the laminated insert, to increase the dynamic performances.

Naturellement, et comme mentionné précédemment, l'invention comprend tous les moyens constituant des équivalents techniques des moyens décrits ainsi que leurs diverses combinaisons.Naturally, and as mentioned above, the invention includes all the means constituting technical equivalents of the means described as well as their various combinations.

Claims (17)

1.- Dispositif d'amortissement des vibrations mécaniques des cylindres tournant à gorge, notamment des cylindres plaque et blanchet des machines offset, des machines de flexographie et autres machines, telles que machines à impression typographique, ladite gorge comprenant un bord d'attaque et un bord de fuite, ledit dispositif comprenant un ou plusieurs moyens d'amortissement des vibrations mécaniques (10, 12) disposés et fixés dans un ou plusieurs logements (18, 20) appropriés prévus à la périphérie du cylindre dans au moins une zone où on désire amortir lesdites vibrations, caractérisé en ce que le moyen d'amortissement précité est constitué par un insert sous forme d'une pièce lamellaire ou lamifiée formée par l'empilement de couches (30 à 37) de matériaux appropriés, adhérisées entre elles.1.- Device for damping the mechanical vibrations of throat-turning cylinders, in particular of plate and blanket cylinders of offset machines, flexography machines and other machines, such as letterpress printing machines, said groove comprising a leading edge and a trailing edge, said device comprising one or more means for damping mechanical vibrations (10, 12) arranged and fixed in one or more suitable housings (18, 20) provided at the periphery of the cylinder in at least one zone where wishes to dampen said vibrations, characterized in that the abovementioned damping means consists of an insert in the form of a lamellar or laminated part formed by the stack of layers (30 to 37) of suitable materials, bonded together. 2.- Dispositif d'amortissement selon la revendication 1, caractérisé en ce que certaines couches (30, 32, 34) sont réalisées au moins partiellement en matériaux souples en compression, et certaines autres couches ou les couches restantes (31, 33, 35, 37) sont réalisées au moins partiellement en matériaux rigides en compression.2.- damping device according to claim 1, characterized in that certain layers (30, 32, 34) are made at least partially of flexible materials in compression, and certain other layers or the remaining layers (31, 33, 35 , 37) are made at least partially of rigid materials in compression. 3.- Dispositif d'amortissement selon la revendication 2, caractérisé en ce que les couches en matériaux souples (30, 32, 34) et les couches en matériaux rigides (31, 33, 35, 37) sont alternées sur au moins certaines zones qui sont destinées à constituer les zones d'amortissement.3.- damping device according to claim 2, characterized in that the layers of flexible materials (30, 32, 34) and the layers of rigid materials (31, 33, 35, 37) are alternated over at least certain areas which are intended to constitute the depreciation areas. 4. Dispositif d'amortissement selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il comprend une pluralité de logements discrets espacés axialement et/ou circonférentiellement entre eux sur le bord de ladite gorge (4).4. Damping device according to any one of claims 1 to 3, characterized in that it comprises a plurality of discrete housings spaced axially and / or circumferentially between them on the edge of said groove (4). 5.- Dispositif d'amortissement selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les logements précités (18, 20) occupent un arc de cercle prédéterminé dont l'angle au centre est de l'ordre de 5 à 20°, de préférence de l'ordre de 10 à 15°.5.- damping device according to any one of claims 1 to 4, characterized in that the aforesaid housings (18, 20) occupy a predetermined arc of circle whose angle at the center is of the order of 5 to 20 °, preferably of the order of 10 to 15 °. 6.- Dispositif d'amortissement selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il comprend une pluralité de logements précités (18, 20) sur certains secteurs du cylindre ou sur toute la surface du cylindre.6. Damping device according to any one of claims 1 to 5, characterized in that it comprises a plurality of aforementioned housings (18, 20) on certain sectors of the cylinder or over the entire surface of the cylinder. 7.- Dispositif d'amortissement selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la dimension des logements précités (18, 20) varie axialement et/ou circonférentiellement pour déterminer un profil variable de rigidité en compression.7. Damping device according to any one of claims 1 to 6, characterized in that the dimension of the aforementioned housings (18, 20) varies axially and / or circumferentially to determine a variable profile of compressive stiffness. 8.- Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les inserts précités comprennent des orifices (14, 16, 22, 24) traversant au moins en partie les couches adhérisées de manière à déterminer un profil variable de rigidité en compression.8.- Device according to any one of claims 1 to 7, characterized in that the aforementioned inserts comprise orifices (14, 16, 22, 24) passing at least partly through the adhered layers so as to determine a variable profile of compression stiffness. 9.- Dispositif d'amortissement selon l'une quelconque des revendications précédentes, caractérisé en ce que l'épaisseur des couches de matériaux souples (30, 32, 34) est variable dans le sens axial et/ou circonférentiel de manière à définir un profil variable de rigidité en compression.9. Damping device according to any one of the preceding claims, characterized in that the thickness of the layers of flexible materials (30, 32, 34) is variable in the axial and / or circumferential direction so as to define a variable compression stiffness profile. 10.- Dispositif d'amortissement selon l'une quelconque des revendications 2 à 9, caractérisé en ce que le matériau souple est choisi dans la gamme des élastomères vulcanisés, réticulés, thermoplastiques, thermostables présentant un module d'élasticité et un amortissement adéquat dans la gamme de températures et de fréquence d'utilisation sur les machines.10. Damping device according to any one of claims 2 to 9, characterized in that the flexible material is chosen from the range of vulcanized, crosslinked, thermoplastic, thermostable elastomers having a modulus of elasticity and adequate damping in the range of temperatures and frequency of use on the machines. 11.- Dispositif d'amortissement selon l'une quelconque des revendications 2 à 9, caractérisé en ce que le matériau souple est choisi dans la gamme des polymères thermodurcissables, thermoplastiques ou thermostables présentant un module d'élasticité et un amortissement adéquats dans la gamme de températures et de fréquence d'utilisation sur les machines.11. Damping device according to any one of Claims 2 to 9, characterized in that the flexible material is chosen from the range of thermosetting, thermoplastic or thermostable polymers having an adequate modulus of elasticity and damping in the range of temperatures and frequency of use on the machines. 12.- Dispositif d'amortissement selon l'une quelconque des revendications 2 à 9, caractérisé en ce que les couches de matériaux souples sont réalisées avec des élastomères ou des polymères de module d'élasticité et des capacités d'amortissement différents.12.- Damping device according to any one of claims 2 to 9, characterized in that the layers of flexible materials are produced with elastomers or polymers of elasticity modulus and different damping capacities. 13.- Dispositif d'amortissement selon l'une quelconque des revendications 2 à 9, caractérisé en ce que le matériau souple est une combinaison d'un nombre arbitraire de matériaux élastomériques et polymériques différents.13.- damping device according to any one of claims 2 to 9, characterized in that the flexible material is a combination of an arbitrary number of different elastomeric and polymeric materials. 14.- Dispositif d'amortissement selon l'une quelconque des revendications 1 à 13, caractérisé en ce que le matériau rigide des couches rigides (31, 33, 35) des inserts (10, 12) est un métal ou un composite de structure ou un renfort fibreux tel que tissu, mat ou des combinaison de ces matériaux.14. Damping device according to any one of claims 1 to 13, characterized in that the rigid material of the rigid layers (31, 33, 35) of the inserts (10, 12) is a metal or a structural composite or a fibrous reinforcement such as fabric, mat or combinations of these materials. 15.- Dispositif d'amortissement selon l'une quelconque des revendications précédentes, caractérisé en ce que les inserts précités lamifiés (10, 12) sont appliqués avec une précontrainte de compression.15. Damping device according to any one of the preceding claims, characterized in that the aforementioned laminated inserts (10, 12) are applied with a compression preload. 16.- Dispositif d'amortissement selon l'une quelconque des revendications 10 à 13, caractérisé en ce que le matériau souple est un matériau cellulaire ou alvéolaire.16. Damping device according to any one of claims 10 to 13, characterized in that the flexible material is a cellular or cellular material. 17.- Dispositif d'amortissement selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on prévoit un ou plusieurs moyens d'amortissement des vibrations mécaniques avec les logements associés dans un secteur du cylindre qui se trouve en appui contre un contre-cylindre lorsque la gorge précitée vient en contact avec un autre cylindre associé.17. Damping device according to any one of the preceding claims, characterized in that one or more means of damping mechanical vibrations are provided with the associated housings in a sector of the cylinder which is in abutment against a counter -cylinder when the aforementioned groove comes into contact with another associated cylinder.
EP86402401A 1985-10-28 1986-10-27 Device for damping the mechanical vibrations of rotating cylinders with gaps, especially of plate and blanket cylinders of rotary offset printing machines Expired - Lifetime EP0224409B1 (en)

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FR8515995 1985-10-28
FR8515995A FR2589102A1 (en) 1985-10-28 1985-10-28 DEVICE FOR DAMPING MECHANICAL VIBRATION OF ROTATING ROLLER CYLINDERS, IN PARTICULAR PLATE AND WHITENER CYLINDERS OF OFFSET ROTARY MACHINES

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EP0224409A1 true EP0224409A1 (en) 1987-06-03
EP0224409B1 EP0224409B1 (en) 1990-05-02

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FR2467323A1 (en) * 1979-10-11 1981-04-17 Wright Barry Corp CYLINDRICAL BEARING IN ELASTOMER
DE2945280B1 (en) * 1979-11-09 1980-10-02 Roland Man Druckmasch Cylinder for rotary printing machines
DE3012060A1 (en) * 1980-03-28 1981-10-08 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach VIBRATION-RESISTANT CYLINDER FOR PRINTING MACHINES
FR2548134A1 (en) * 1983-06-29 1985-01-04 Hutchinson Stop device of the laminated type

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435027A2 (en) * 1989-12-18 1991-07-03 Rockwell International Corporation Printing press blanket cylinder assembly and method of making same
EP0435027A3 (en) * 1989-12-18 1992-03-25 Rockwell International Corporation Printing press blanket cylinder assembly and method of making same

Also Published As

Publication number Publication date
AU579030B2 (en) 1988-11-10
JPS62165044A (en) 1987-07-21
AU6420086A (en) 1987-04-30
BR8605227A (en) 1987-07-28
CA1286537C (en) 1991-07-23
FR2589102A1 (en) 1987-04-30
DE3670791D1 (en) 1990-06-07
US4895072A (en) 1990-01-23
EP0224409B1 (en) 1990-05-02

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