EP1400356B1 - Device with a blanket and a blanket cylinder;cylinder, blanket and printing machine - Google Patents

Device with a blanket and a blanket cylinder;cylinder, blanket and printing machine Download PDF

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Publication number
EP1400356B1
EP1400356B1 EP03292193A EP03292193A EP1400356B1 EP 1400356 B1 EP1400356 B1 EP 1400356B1 EP 03292193 A EP03292193 A EP 03292193A EP 03292193 A EP03292193 A EP 03292193A EP 1400356 B1 EP1400356 B1 EP 1400356B1
Authority
EP
European Patent Office
Prior art keywords
blanket
support plate
cylinder
slot
edge
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.)
Expired - Lifetime
Application number
EP03292193A
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German (de)
French (fr)
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EP1400356A2 (en
EP1400356A3 (en
Inventor
Etienne Tezenas Du Montcel
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.)
Goss International France SAS
Original Assignee
Goss Systemes Graphiques Nantes SAS
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Application filed by Goss Systemes Graphiques Nantes SAS filed Critical Goss Systemes Graphiques Nantes SAS
Publication of EP1400356A2 publication Critical patent/EP1400356A2/en
Publication of EP1400356A3 publication Critical patent/EP1400356A3/en
Application granted granted Critical
Publication of EP1400356B1 publication Critical patent/EP1400356B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/1225—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly
    • B41F27/1243—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end substantially rectilinearly by pivotal or swivelling motion, e.g. by means of a rocking lever
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1218—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices
    • B41F27/125—Devices for attaching printing elements or formes to supports for attaching flexible printing formes comprising printing plate tensioning devices moving in the printing plate end on a curvilinear path, e.g. by winding on a roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41F30/04—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer cylinders

Definitions

  • the present invention relates to an offset press assembly according to the preamble of claim 1.
  • Such a press conventionally comprises, in addition to the blanket cylinder and the blanket, a plate cylinder and a plate, and a pressure cylinder.
  • the plate carried by the plate cylinder is moistened and then inked.
  • the plate decals the ink from its printer regions on the blanket carried by the blanket cylinder.
  • the blanket then decodes the ink onto the printing paper that passes between the blanket cylinder and the pressure cylinder.
  • FR-2,573,347 has proposed an assembly according to the preamble of claim 1.
  • the front edge of the blanket covers the entire front edge of the support plate and thus enters the slot of the cylinder.
  • the rear edge of the blanket does not penetrate into the slot and is applied substantially against the front fold region of the blanket unit.
  • the gap between the beginning of the blanket and the end of the blanket is extremely narrow in order to limit the vibrations resulting from the presence of the slot in the cylinder.
  • FR-2 733 719 has proposed another solution in which the device for fixing the blanket unit comprises pressure pads which come to apply the front and rear edges of the support plate against the front wall of the slot. These front and rear edges of the support plate are not coated by the blanket. The forces exerted by the studs are exclusively perpendicular to the front and rear edges of the support plate.
  • the fixing device described does not absorb the deformations of the blanket unit resulting from the operation of the offset press.
  • the dilations of the support plate can not be absorbed so that breaks are observed in the vicinity of its rear fold.
  • US-2002/0 078 846 discloses an assembly comprising a blanket unit and a cylinder provided with a device for fastening the blanket unit.
  • the rear edge of the blanket unit support plate has no opening. It is folded to cooperate with a blade of the fixing device, which does not exert a traction force substantially parallel to the rear edge.
  • DE-100 60 171 discloses another blanket attachment device and US-6 561 094 is concerned with the fixing of a printing plate.
  • An object of the invention is to provide an assembly according to the preamble of claim 1 and which allows to extend and fix the blanket unit on the cylinder in a satisfactory manner, and which is simple and economical to achieve.
  • the subject of the invention is an assembly according to claim 1.
  • the set may comprise one or more dependent claims 2 to 7.
  • FIG. 1 schematically illustrates an assembly 1 for an offset press which comprises a cylinder 2 and a blanket unit 3 surrounding the peripheral surface 4 of the cylinder 2 and carried by the cylinder 2.
  • the cylinder 2 extends along a longitudinal axis A and its longitudinal ends 5, only one of which is visible in FIG. 1, are intended to be received in bearings of the frame of an offset press.
  • the cylinder 2 can, thanks to conventional drive means not shown, rotate about its longitudinal axis A in a direction illustrated by the arrow 6 in Figure 1.
  • a longitudinal recess 8 has been formed in the cylinder 2 from its peripheral surface 4.
  • This recess 8 has substantially a rectangular trapezoidal section with a rounded side corresponding to a portion of the peripheral surface 4 of the cylinder 2.
  • This insert 10 defines inside the cylinder 2 a longitudinal cavity 12 of substantially rectangular section and a longitudinal slot 14 of substantially triangular section.
  • the slot 14 opens into the peripheral surface 4 of the cylinder 2 and into the cavity 12.
  • the front wall 16 is connected to the peripheral surface 4 by a chamfer 18, for example approximately 1 mm.
  • This chamfer 22 has for example a width of about 1.4 mm.
  • the front walls 16 and rear 20 of the slot 14 diverge towards the cavity 12, that is to say from the upstream to the downstream of the slot 14.
  • the walls 16 and 20 thus form between them an angle typically ⁇ about 14.8 °. More generally, this angle ⁇ will be less than 20 °.
  • the upstream width of the slot 14 between the walls 16 and 20, that is to say downstream of the chamfers 18 and 22, is about 1 mm. More generally, this width l will be less than 1.5 mm and preferably less than 1.1 mm.
  • the cylinder 2 comprises a device 26 for fixing the blanket unit 3 to the cylinder 2.
  • This device 26 is housed in the cavity 12 and comprises a pin 28 extending along an axis XX substantially parallel to the axis A of the cylinder 2. This pin 28 extends for example all along the cylinder 2.
  • hooks 30 and support elements 32 are distributed along pin 28.
  • the hooks 30 are formed by elastic blades whose free ends 34 are bent opposite the slot 14.
  • the support elements 32 are formed by resilient blades whose free ends 36 are folded at 180 °.
  • the hooks 30 and the support elements 32 are associated in pairs, the hook 30 and the support member 32 being attached by a common screw 38 to the pin 28.
  • the support element 32 is disposed of top of the hook 30 associated.
  • the hook pairs 30 / support member 32 are spaced longitudinally from each other and distributed along the pin 28.
  • the pin 28 is rotatably mounted about its longitudinal axis X-X in the cavity 12, for example by means of bearings provided at the ends of the pin 28 and optionally in intermediate regions thereof.
  • the pin 28 is thus movable between two positions illustrated respectively by FIGS. 2 and 6.
  • the rod 46 is articulated by a first of its ends to the block 52.
  • the rod 46 is mounted at its other end in the support 44 by means of a hinge allowing it to pivot in a plane orthogonal to the axis A of the cylinder 2.
  • the spring 50 takes first support on the block 44 and also on the flange 48.
  • the rod 46 can move relative to the support 44 between two stable end positions.
  • the first stable end position is shown in FIG. 1. This position corresponds to the release position of the spindle 28 illustrated in FIG. 1.
  • the second stable end position is shown in FIG. 7.
  • the spindle 28 is in its fixing position illustrated in FIG.
  • the rod 46 will then pass through an unstable neutral position where its axis will cut the axis XX of the pin 28.
  • the spring 50 is then compressed so that it will push the rod 46 to its second stable position, c That is to say that of FIG. 7.
  • the block 52 is then bearing against an adjustable stop 58 which makes it possible to adjust the angular position of the pin 28 in its fixing position.
  • the mechanism 42 crossing neutral is used to manually move the pin 28 from its release position to its fixing position and vice versa. Note, however, that any other type of drive mechanism 42 may be used.
  • the blanket unit 3 comprises a support plate 62 and a blanket 64 fixed on the support plate 62.
  • the support plate 62 is for example made of stainless steel. Its thickness is about 0.2mm.
  • the blanket 64 comprises for example conventionally several layers of elastomer and fabric.
  • the blanket 64 is fixed to the support plate 62 by gluing or vulcanization.
  • the leading edge 66 of the backing plate 62 extends beyond the leading edge 68 of the blanket 64.
  • the leading edge 66 of the backing plate 62 is folded at a forward fold 70 to form with the remainder of the blank. the plate 62 an acute angle ⁇ .
  • the front edge 68 of the blanket 64 is slightly set back from the fold 70. However, in some embodiments, the leading edge 68 may protrude to at least partially cover the fold 70. Whatever the case may be, the edge before 68 will be located near the fold 70 not to enter the slot 14.
  • the leading edge 66 of the support plate 62 is not coated by the blanket 64 and is inserted into the slot 14.
  • the front fold 70 passes over the chamfer 18 and the front edge 66 of the plate 62 runs along the wall before 16 of the slot 14.
  • the blanket unit 3 has a rear configuration similar to the rear edge 72 of the plate 62 which is not covered by the rear edge 74 of the blanket 64.
  • the rear edge 72 is folded at a fold rear 76 by relative to the rest of the support plate 62 forming, by difference with the front of the blanket unit 3, an obtuse angle.
  • the bare rear edge 72 is inserted into the slot 14 and extends along and against the rear wall 20 of the slot 14.
  • the trailing edge 74 of the blanket 64 is disposed near the rear fold 22 so as not to penetrate the slot 14 and be relatively close to the front edge 68 of the blanket 64.
  • the front 66 and rear 72 edges of the support plate 62 extend within the slot 14 into the cavity 12 and form a non-zero angle therebetween.
  • the rear edge 72 of the support plate 62 has at its free end 78 a series of openings 80 distributed along the end 78. These openings 80 have substantially a rectangular shape and are each arranged next to a pair of hook 30 / support member 32.
  • the front edge 66 of the support plate 62 is first inserted into the slot 14, then the blanket unit 3 is wound around the cylinder 2 to engage the rear edge 72 of the cylinder. the support plate 62 in the slot 14. The blanket unit 3 is then in the position of FIG.
  • each hook 30 is engaged in the corresponding opening 80 of the rear edge 72 of the support plate 62 and the associated support element 32 passes through the same 80. This is illustrated in Figure 5.
  • each hook 30 exerts on the rear base 72 of the support plate 62 a traction force T substantially parallel to the rear edge 72.
  • the trailing edge 72 of the plate 62 is pulled by the hooks 30 thus ensuring a satisfactory tensioning of the blanket 64 and the front edge 66 of the support plate 2 is applied against the front wall 16. It will be noted that the rear edge 72 still forms a non-zero angle with the front edge 66 of the support plate 62.
  • the blanket unit 3 is fixed and tensioned on the cylinder 2 satisfactorily.
  • the hooks 30 and the support elements 32 allow, thanks to their embodiment in the form of elastic elements, slight displacements of the edges 66 and 72 of the support plate 2. This allows to adapt to different constraints operation of the offset press, and in particular to the phenomenon of thermal expansion of the support plate 62 and the phenomenon called "crowding".
  • the rear edge 72 of the support plate 62 may, under the effect of the thermal expansion or during the phenomenon called “crowding", further penetrate the slot 14, the hooks 30 allowing this movement while maintaining the unit blanket 3 under tension.
  • the bearing elements 32 form means 82 for applying the front edge 66 of the support plate 62 to the wall 16 which makes it possible to stabilize the blanket unit 3 on the cylinder 2.
  • apertures 80 in the support plate 62 for cooperating with the hooks 30 enables the support plate not to present curved rear edge and therefore to maintain a width of the slot 14 low.
  • the inclination of the rear edge 72 of the support plate 62 with respect to its front edge 66 also allows the slot 14 to have a slight upstream width l .
  • This width l is even lower than neither the front edge 68 nor the rear edge 74 of the blanket 64 penetrate the slot 14.
  • the blanket 64 not covering the entire front edge 66 of the support plate 62, as in FR-2,573,347, the realization of the blanket unit, and in particular the folding of the support plate, are simple and economically, while limiting vibrations during operation.
  • the application means 82 are formed not by support members 32 belonging to the fixing device 26 but by a region of the rear edge 72 of the support plate 62.
  • this rear edge 72 has an intermediate fold 84 delimiting in the rear edge 72 an end region 86 in which the openings 80 for receiving the hooks 30 are formed, and an intermediate region 88 folded less strongly relative to the rest of the Support plate 62.
  • This intermediate region 88 bears on the front edge 66 of the support plate 62 and applies it against the wall 16.
  • Figure 9 relates to a third embodiment differing from that of Figures 1 to 7 in that the means 82 for applying the front edge 66 of the support plate 62 against the wall 16 have been removed.
  • the cylinder and the blanket unit may be sold independently of one another.
  • the above principles can be used with a cylinder 2 on which two blanket units 3 are attached next to each other along the axis A of the cylinder 2.
  • the fasteners 42 associated with each blanket unit 3 may be angularly offset from each other with respect to the axis A, for example 180 °.
  • the slots 14 associated with each blanket unit 3 are diametrically opposed, which limits the vibrations generated during the rolling on the other rolls of the press, and do not extend over the entire length of the cylinder 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Rotary Presses (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Description

La présente invention concerne un ensemble pour presse offset selon le préambule de la revendication 1.The present invention relates to an offset press assembly according to the preamble of claim 1.

Une telle presse comprend classiquement, en plus du cylindre porte-blanchet et du blanchet, un cylindre porte-plaque et une plaque, et un cylindre de pression.Such a press conventionally comprises, in addition to the blanket cylinder and the blanket, a plate cylinder and a plate, and a pressure cylinder.

En fonctionnement, la plaque portée par le cylindre porte-plaque est humidifiée puis encrée. La plaque décalque l'encre de ses régions imprimantes sur le blanchet porté par le cylindre porte-blanchet. Le blanchet décalque ensuite l'encre sur le papier à imprimer qui passe entre le cylindre porte-blanchet et le cylindre de pression.In operation, the plate carried by the plate cylinder is moistened and then inked. The plate decals the ink from its printer regions on the blanket carried by the blanket cylinder. The blanket then decodes the ink onto the printing paper that passes between the blanket cylinder and the pressure cylinder.

Pour tendre le blanchet sur le cylindre, on utilisait traditionnellement des barrettes métalliques serties aux extrémités du blanchet. Ces barrettes étaient engagées dans la fente du cylindre, où elles étaient poussées par un dispositif à vis.To set the blanket on the cylinder, it was traditionally used metal bars crimped to the ends of the blanket. These bars were engaged in the slot of the cylinder, where they were pushed by a screw device.

De tels agencements conduisent à des largeurs de fentes très importantes, allant jusqu'à 22mm.Such arrangements lead to very large slot widths, up to 22mm.

La présence de fentes aussi larges provoque, lors du roulement du cylindre porte-blanchet contre le cylindre porte-plaque et contre le cylindre de pression, des chocs et des vibrations. De telles vibrations limitent les vitesses de rotation des différents cylindres et donc les capacités de production des presses offset.The presence of such wide slits causes, during the rolling of the blanket cylinder against the plate cylinder and against the pressure cylinder, shocks and vibrations. Such vibrations limit the rotational speeds of the various cylinders and therefore the production capabilities of the offset presses.

FR-2 573 347 a proposé un ensemble selon le préambule de la revendication 1. Le bord avant du blanchet recouvre tout le bord avant de la plaque de support et pénètre donc dans la fente du cylindre. Le bord arrière du blanchet ne pénètre pas dans la fente et vient s'appliquer sensiblement contre la région de pli avant de l'unité de blanchet. Ainsi, l'interstice entre le début du blanchet et la fin du blanchet est extrêmement étroit afin de limiter les vibrations résultant de la présence de la fente dans le cylindre.FR-2,573,347 has proposed an assembly according to the preamble of claim 1. The front edge of the blanket covers the entire front edge of the support plate and thus enters the slot of the cylinder. The rear edge of the blanket does not penetrate into the slot and is applied substantially against the front fold region of the blanket unit. Thus, the gap between the beginning of the blanket and the end of the blanket is extremely narrow in order to limit the vibrations resulting from the presence of the slot in the cylinder.

Toutefois, on a constaté qu'il était extrêmement difficile de plier le bord avant de la plaque et le bord avant du blanchet afin d'atteindre la configuration souhaitée dans ce document.However, it has been found that it is extremely difficult to fold the leading edge of the plate and the leading edge of the blanket to achieve the desired configuration in this document.

FR-2 733 719 a proposé une autre solution dans laquelle le dispositif de fixation de l'unité de blanchet comprend des plots de pression qui viennent appliquer les bords avant et arrière de la plaque de support contre la paroi avant de la fente. Ces bords avant et arrière de la plaque de support ne sont pas revêtus par le blanchet. Les efforts exercés par les plots sont exclusivement perpendiculaires aux bords avant et arrière de la plaque de support.FR-2 733 719 has proposed another solution in which the device for fixing the blanket unit comprises pressure pads which come to apply the front and rear edges of the support plate against the front wall of the slot. These front and rear edges of the support plate are not coated by the blanket. The forces exerted by the studs are exclusively perpendicular to the front and rear edges of the support plate.

On a constaté que cet agencement ne permettait pas de tendre de manière satisfaisante l'unité de blanchet. En outre, le dispositif de fixation décrit ne permet pas d'absorber les déformations de l'unité de blanchet résultant du fonctionnement de la presse offset. En particulier, les dilatations de la plaque de support ne peuvent pas être absorbées de sorte qu'on observe des ruptures de cette dernière au voisinage de son pli arrière.It has been found that this arrangement does not make it possible to satisfactorily tighten the blanket unit. In addition, the fixing device described does not absorb the deformations of the blanket unit resulting from the operation of the offset press. In particular, the dilations of the support plate can not be absorbed so that breaks are observed in the vicinity of its rear fold.

FR-2 745 524 a proposé de remplacer les plots de pression par une ou plusieurs lames élastiques. Toutefois, cet agencement ne permet toujours pas d'atteindre une tension satisfaisante de l'unité de blanchet.FR-2,745,524 proposed to replace the pressure pads with one or more resilient blades. However, this arrangement still does not achieve a satisfactory voltage of the blanket unit.

US-2002/0 078 846 décrit un ensemble comprenant une unité de blanchet et un cylindre muni d'un dispositif de fixation de l'unité de blanchet. Le bord arrière de la plaque de support de l'unité de blanchet ne présente pas d'ouverture. Il est replié pour coopérer avec une lame du dispositif de fixation, qui n'exerce pas d'effort de traction sensiblement parallèle au bord arrière.US-2002/0 078 846 discloses an assembly comprising a blanket unit and a cylinder provided with a device for fastening the blanket unit. The rear edge of the blanket unit support plate has no opening. It is folded to cooperate with a blade of the fixing device, which does not exert a traction force substantially parallel to the rear edge.

DE-100 60 171 décrit un autre dispositif de fixation de blanchet et US-6 561 094 s'intéresse quant à lui à la fixation d'une plaque d'impression.DE-100 60 171 discloses another blanket attachment device and US-6 561 094 is concerned with the fixing of a printing plate.

Un but de l'invention est de fournir un ensemble selon le préambule de la revendication 1 et qui permette de tendre et de fixer l'unité de blanchet sur le cylindre de manière satisfaisante, et qui soit simple et économique à réaliser.An object of the invention is to provide an assembly according to the preamble of claim 1 and which allows to extend and fix the blanket unit on the cylinder in a satisfactory manner, and which is simple and economical to achieve.

A cet effet, l'invention a pour objet un ensemble selon la revendication 1.For this purpose, the subject of the invention is an assembly according to claim 1.

Selon des modes particuliers de réalisation, l'ensemble peut comprendre l'une ou plusieurs des revendications dépendantes 2 à 7.According to particular embodiments, the set may comprise one or more dependent claims 2 to 7.

L'invention sera mieux comprise à la suite de la description qui va suivre, donnée uniquement à titre d'exemple, et faite en se référant aux dessins annexés, sur lesquels :

  • la figure 1 est une vue schématique latérale d'un ensemble selon un premier mode de réalisation de l'invention,
  • la figure 2 est une vue schématique, partielle, agrandie et en coupe transversale illustrant le dispositif de fixation de l'unité de blanchet de l'ensemble de la figure 1,
  • la figure 3 est une vue partielle, schématique de dessus illustrant une partie de la broche du dispositif de fixation de la figure 2,
  • la figure 4 est une vue partielle schématique illustrant le bord arrière de la plaque de support de l'unité de blanchet,
  • les figures 5 et 6 sont des vues analogues à la figure 2 illustrant des étapes successives de l'engagement de l'unité de blanchet par le dispositif de fixation,
  • la figure 7 est une vue analogue à la figure 1 illustrant la position d'un mécanisme d'entraînement du dispositif de fixation à l'issue de la fixation de l'unité de blanchet,
  • la figure 8 est une vue analogue à la figure 6, illustrant un deuxième mode de réalisation de l'invention, et
  • la figure 9 est une vue analogue à la figure 6 illustrant un autre troisième mode de réalisation de l'invention.
The invention will be better understood following the description which follows, given solely by way of example, and with reference to the appended drawings, in which:
  • FIG. 1 is a schematic side view of an assembly according to a first embodiment of the invention,
  • FIG. 2 is a diagrammatic, partial, enlarged cross-sectional view illustrating the device for fastening the blanket unit of the assembly of FIG. 1,
  • FIG. 3 is a partial schematic view from above illustrating a part of the pin of the fixing device of FIG. 2,
  • FIG. 4 is a schematic partial view illustrating the rear edge of the support plate of the blanket unit,
  • FIGS. 5 and 6 are views similar to FIG. 2 illustrating successive steps in the engagement of the blanket unit by the fixing device,
  • FIG. 7 is a view similar to FIG. 1 illustrating the position of a driving mechanism of the fastening device after the fixing of the blanket unit,
  • FIG. 8 is a view similar to FIG. 6, illustrating a second embodiment of the invention, and
  • Figure 9 is a view similar to Figure 6 illustrating another third embodiment of the invention.

La figure 1 illustre schématiquement un ensemble 1 pour presse offset qui comprend un cylindre 2 et une unité de blanchet 3 entourant la surface périphérique 4 du cylindre 2 et portée par le cylindre 2.FIG. 1 schematically illustrates an assembly 1 for an offset press which comprises a cylinder 2 and a blanket unit 3 surrounding the peripheral surface 4 of the cylinder 2 and carried by the cylinder 2.

Le cylindre 2 s'étend le long d'un axe longitudinal A et ses extrémités longitudinales 5, dont une seule est visible sur la figure 1, sont destinées à être reçues dans des paliers du bâti d'une presse offset. Ainsi, le cylindre 2 peut, grâce à des moyens d'entraînement classiques non-représentés, tourner autour de son axe longitudinal A dans un sens illustré par la flèche 6 sur la figure 1.The cylinder 2 extends along a longitudinal axis A and its longitudinal ends 5, only one of which is visible in FIG. 1, are intended to be received in bearings of the frame of an offset press. Thus, the cylinder 2 can, thanks to conventional drive means not shown, rotate about its longitudinal axis A in a direction illustrated by the arrow 6 in Figure 1.

Dans tout ce qui suit, les termes « avant » et « arrière » utilisés s'entendront par rapport à ce sens de rotation 6.In all that follows, the terms "before" and "rear" used will be understood in relation to this direction of rotation 6.

Comme on le voit sur la figure 2, un évidement 8 longitudinal a été ménagé dans le cylindre 2 depuis sa surface périphérique 4. Cet évidement 8 a sensiblement une section de trapèze rectangle avec un côté arrondi correspondant à une partie de la surface périphérique 4 du cylindre 2.As seen in Figure 2, a longitudinal recess 8 has been formed in the cylinder 2 from its peripheral surface 4. This recess 8 has substantially a rectangular trapezoidal section with a rounded side corresponding to a portion of the peripheral surface 4 of the cylinder 2.

Un insert 10 est vissé dans l'évidement 8.An insert 10 is screwed into the recess 8.

Cet insert 10 délimite à l'intérieur du cylindre 2 une cavité 12 longitudinale de section sensiblement rectangulaire et une fente 14 longitudinale de section sensiblement triangulaire.This insert 10 defines inside the cylinder 2 a longitudinal cavity 12 of substantially rectangular section and a longitudinal slot 14 of substantially triangular section.

La fente 14 débouche dans la surface périphérique 4 du cylindre 2 et dans la cavité 12.The slot 14 opens into the peripheral surface 4 of the cylinder 2 and into the cavity 12.

Comme illustré plus particulièrement par la partie cerclée agrandie de la figure 2, la paroi avant 16, commune à la fente 14 et à la cavité 12, est reliée à la surface périphérique 4 par un chanfrein 18, par exemple de largeur d'environ 1 mm.As illustrated more particularly by the enlarged circled portion of FIG. 2, the front wall 16, common to the slot 14 and to the cavity 12, is connected to the peripheral surface 4 by a chamfer 18, for example approximately 1 mm.

De même la paroi arrière 20 de la fente 14 est reliée par un chanfrein 22 à la surface périphérique 4. Ce chanfrein 22 a par exemple une largeur d'environ 1,4mm.Similarly, the rear wall 20 of the slot 14 is connected by a chamfer 22 to the peripheral surface 4. This chamfer 22 has for example a width of about 1.4 mm.

Les parois avant 16 et arrière 20 de la fente 14 divergent en s'approchant de la cavité 12, c'est à dire de l'amont vers l'aval de la fente 14. Les parois 16 et 20 forment ainsi entre elles un angle α typiquement d'environ 14,8°. Plus généralement, cet angle α sera inférieur à 20°.The front walls 16 and rear 20 of the slot 14 diverge towards the cavity 12, that is to say from the upstream to the downstream of the slot 14. The walls 16 and 20 thus form between them an angle typically α about 14.8 °. More generally, this angle α will be less than 20 °.

La largeur amont de la fente 14 entre les parois 16 et 20, c'est à dire en aval des chanfreins 18 et 22, est d'environ 1 mm. De manière plus générale, cette largeur l sera inférieure à 1,5mm et de préférence inférieure à 1,1 mm.The upstream width of the slot 14 between the walls 16 and 20, that is to say downstream of the chamfers 18 and 22, is about 1 mm. More generally, this width l will be less than 1.5 mm and preferably less than 1.1 mm.

Le cylindre 2 comprend un dispositif 26 de fixation de l'unité de blanchet 3 sur le cylindre 2. Ce dispositif 26 est logé dans la cavité 12 et comprend une broche 28 s'étendant le long d'un axe X-X sensiblement parallèle à l'axe A du cylindre 2. Cette broche 28 s'étend par exemple tout le long du cylindre 2.The cylinder 2 comprises a device 26 for fixing the blanket unit 3 to the cylinder 2. This device 26 is housed in the cavity 12 and comprises a pin 28 extending along an axis XX substantially parallel to the axis A of the cylinder 2. This pin 28 extends for example all along the cylinder 2.

Comme illustré par les figures 2 et 3, des crochets 30 et des éléments d'appui 32 sont répartis le long de la broche 28.As illustrated by FIGS. 2 and 3, hooks 30 and support elements 32 are distributed along pin 28.

Les crochets 30 sont formés par des lames élastiques dont les extrémités libres 34 sont courbées à l'opposé de la fente 14.The hooks 30 are formed by elastic blades whose free ends 34 are bent opposite the slot 14.

De même, les éléments d'appui 32 sont formés par des lames élastiques dont les extrémités libres 36 sont repliées à 180°.Similarly, the support elements 32 are formed by resilient blades whose free ends 36 are folded at 180 °.

Les crochets 30 et les éléments d'appui 32 sont associés par paires, le crochet 30 et l'élément d'appui 32 associés étant fixés par une vis commune 38 sur la broche 28. L'élément d'appui 32 est disposé au-dessus du crochet 30 associé.The hooks 30 and the support elements 32 are associated in pairs, the hook 30 and the support member 32 being attached by a common screw 38 to the pin 28. The support element 32 is disposed of top of the hook 30 associated.

Les paires de crochet 30/élément d'appui 32 sont espacées longitudinalement les unes des autres et réparties le long de la broche 28.The hook pairs 30 / support member 32 are spaced longitudinally from each other and distributed along the pin 28.

La broche 28 est montée rotative autour de son axe longitudinal X-X dans la cavité 12, grâce par exemple à des paliers prévus aux extrémités de la broche 28 et éventuellement dans des régions intermédiaires de celle-ci.The pin 28 is rotatably mounted about its longitudinal axis X-X in the cavity 12, for example by means of bearings provided at the ends of the pin 28 and optionally in intermediate regions thereof.

La broche 28 est ainsi mobile entre deux positions illustrées respectivement par les figures 2 et 6.The pin 28 is thus movable between two positions illustrated respectively by FIGS. 2 and 6.

Dans la position de la figure 2, ou position de libération de l'unité de blanchet 3, les crochets 30 et les éléments d'appui 32 sont éloignés de la fente 14 et libèrent l'accès à la cavité 12.In the position of FIG. 2, or the release position of the blanket unit 3, the hooks 30 and the support elements 32 are remote from the slot 14 and release access to the cavity 12.

Dans la position de la figure 6, ou position de fixation de l'unité de blanchet 3, les crochets 30 et les éléments d'appui 32 sont rapprochés de la paroi avant 16.In the position of FIG. 6, or the fixing position of the blanket unit 3, the hooks 30 and the support elements 32 are brought closer to the front wall 16.

Pour passer de la position de la figure 2 à la position de la figure 6, la broche 28 pivote dans le sens anti-horaire comme vu sur ces figures. Ce pivotement peut être assuré grâce à des mécanismes d'entraînement 42, dont un seul est visible sur la figure 1, l'autre étant de structure analogue et disposé de l'autre côté du cylindre 2. Ainsi, seul le mécanisme 42 visible sur la figure 1 sera décrit par la suite.To move from the position of Figure 2 to the position of Figure 6, the pin 28 pivots in the counterclockwise direction as seen in these figures. This pivoting can be ensured by means of drive mechanisms 42, only one of which is visible in FIG. 1, the other being of similar structure and disposed on the other side of the cylinder 2. Thus, only the mechanism 42 visible on Figure 1 will be described later.

Ce mécanisme d'entraînement 42 peut par exemple comprendre

  • un support 44 fixé sur un flanc du cylindre,
  • une tige 46 munie d'une collerette 48 et entourée d'un ressort 50,
  • un bloc 52 fixé à l'extrémité longitudinale 54 correspondante de la broche 28, et
  • un levier amovible d'actionnement 56 représenté en pointillés sur la figure 1.
This drive mechanism 42 may for example comprise
  • a support 44 fixed on a side of the cylinder,
  • a rod 46 provided with a flange 48 and surrounded by a spring 50,
  • a block 52 fixed to the corresponding longitudinal end 54 of the pin 28, and
  • a detachable actuating lever 56 shown in dashed lines in FIG.

La tige 46 est articulée par une première de ses extrémités au bloc 52. La tige 46 est montée à son autre extrémité dans le support 44 par l'intermédiaire d'une articulation lui permettant de pivoter dans un plan orthogonal à l'axe A du cylindre 2. Le ressort 50 prend d'une part appui sur le bloc 44 et par ailleurs sur la collerette 48.The rod 46 is articulated by a first of its ends to the block 52. The rod 46 is mounted at its other end in the support 44 by means of a hinge allowing it to pivot in a plane orthogonal to the axis A of the cylinder 2. The spring 50 takes first support on the block 44 and also on the flange 48.

Grâce au levier 56, la tige 46 peut se déplacer par rapport au support 44 entre deux positions extrêmes stables.With the lever 56, the rod 46 can move relative to the support 44 between two stable end positions.

La première position extrême stable est représentée sur la figure 1. Cette position correspond à la position de libération de la broche 28 illustrée par la figure 2.The first stable end position is shown in FIG. 1. This position corresponds to the release position of the spindle 28 illustrated in FIG.

La deuxième position extrême stable est représentée sur la figure 7. Dans cette position, la broche 28 est dans sa position de fixation illustrée par la figure 6 .The second stable end position is shown in FIG. 7. In this position, the spindle 28 is in its fixing position illustrated in FIG.

Pour passer de la position de la figure 1 à celle de la figure 7, un opérateur fait pivoter le levier 56 dans le sens anti-horaire comme illustré par la flèche 60 sur la figure 1.To move from the position of Figure 1 to that of Figure 7, an operator rotates the lever 56 in the counterclockwise direction as shown by the arrow 60 in Figure 1.

La tige 46 va alors passer par une position instable de point mort où son axe va couper l'axe X-X de la broche 28. Le ressort 50 est alors comprimé de sorte qu'il va repousser la tige 46 vers sa deuxième position stable, c'est à dire celle de la figure 7. Le bloc 52 est alors en appui contre une butée réglable 58 qui permet de régler la position angulaire de la broche 28 dans sa position de fixation.The rod 46 will then pass through an unstable neutral position where its axis will cut the axis XX of the pin 28. The spring 50 is then compressed so that it will push the rod 46 to its second stable position, c That is to say that of FIG. 7. The block 52 is then bearing against an adjustable stop 58 which makes it possible to adjust the angular position of the pin 28 in its fixing position.

Ainsi, le mécanisme 42 à franchissement de point mort permet de déplacer manuellement la broche 28 de sa position de libération vers sa position de fixation et inversement. On notera toutefois que tout autre type de mécanisme d'entraînement 42 peut être utilisé.Thus, the mechanism 42 crossing neutral is used to manually move the pin 28 from its release position to its fixing position and vice versa. Note, however, that any other type of drive mechanism 42 may be used.

En revenant à la figure 2, on peut constater que l'unité de blanchet 3 comprend une plaque de support 62 et un blanchet 64 fixé sur la plaque de support 62.Returning to FIG. 2, it can be seen that the blanket unit 3 comprises a support plate 62 and a blanket 64 fixed on the support plate 62.

La plaque de support 62 est par exemple réalisée en acier inox. Son épaisseur est d'environ 0,2mm.The support plate 62 is for example made of stainless steel. Its thickness is about 0.2mm.

Le blanchet 64 comprend par exemple classiquement plusieurs couches d'élastomère et de tissu. Le blanchet 64 est fixé à la plaque de support 62 par collage ou vulcanisation.The blanket 64 comprises for example conventionally several layers of elastomer and fabric. The blanket 64 is fixed to the support plate 62 by gluing or vulcanization.

Le bord avant 66 de la plaque de support 62 s'étend au-delà du bord avant 68 du blanchet 64. Le bord avant 66 de la plaque de support 62 est replié au niveau d'un pli avant 70 pour former avec le reste de la plaque 62 un angle β aigu.The leading edge 66 of the backing plate 62 extends beyond the leading edge 68 of the blanket 64. The leading edge 66 of the backing plate 62 is folded at a forward fold 70 to form with the remainder of the blank. the plate 62 an acute angle β.

Le bord avant 68 du blanchet 64 est disposé légèrement en retrait par rapport au pli 70. Toutefois, dans certaines variantes, le bord avant 68 peut s'avancer pour recouvrir au moins en partie le pli 70. Quoiqu'il en soit, le bord avant 68 sera situé au voisinage du pli 70 pour ne pas pénétrer dans la fente 14.The front edge 68 of the blanket 64 is slightly set back from the fold 70. However, in some embodiments, the leading edge 68 may protrude to at least partially cover the fold 70. Whatever the case may be, the edge before 68 will be located near the fold 70 not to enter the slot 14.

Le bord avant 66 de la plaque de support 62 n'est pas revêtu par le blanchet 64 et est inséré dans la fente 14. Le pli avant 70 passe au-dessus du chanfrein 18 et le bord avant 66 de la plaque 62 longe la paroi avant 16 de la fente 14.The leading edge 66 of the support plate 62 is not coated by the blanket 64 and is inserted into the slot 14. The front fold 70 passes over the chamfer 18 and the front edge 66 of the plate 62 runs along the wall before 16 of the slot 14.

L'unité de blanchet 3 présente à l'arrière une configuration analogue avec le bord arrière 72 de la plaque 62 qui n'est pas recouvert par le bord arrière 74 du blanchet 64. Le bord arrière 72 est plié au niveau d'un pli arrière 76 par rapport au reste de la plaque de support 62 en formant, par différence avec l'avant de l'unité de blanchet 3, un angle obtus.The blanket unit 3 has a rear configuration similar to the rear edge 72 of the plate 62 which is not covered by the rear edge 74 of the blanket 64. The rear edge 72 is folded at a fold rear 76 by relative to the rest of the support plate 62 forming, by difference with the front of the blanket unit 3, an obtuse angle.

Le bord arrière 72 à nu est inséré dans la fente 14 et s'étend le long et contre la paroi arrière 20 de la fente 14.The bare rear edge 72 is inserted into the slot 14 and extends along and against the rear wall 20 of the slot 14.

Le bord arrière 74 du blanchet 64 est disposé au voisinage du pli arrière 22 pour ne pas pénétrer dans la fente 14 et être relativement proche du bord avant 68 du blanchet 64.The trailing edge 74 of the blanket 64 is disposed near the rear fold 22 so as not to penetrate the slot 14 and be relatively close to the front edge 68 of the blanket 64.

Les bords avant 66 et arrière 72 de la plaque de support 62 s'étendent à l'intérieur de la fente 14 jusque dans la cavité 12 et forment entre eux un angle non nul.The front 66 and rear 72 edges of the support plate 62 extend within the slot 14 into the cavity 12 and form a non-zero angle therebetween.

Comme illustré par la figure 4, le bord arrière 72 de la plaque de support 62 présente à son extrémité libre 78 une série d'ouvertures 80 réparties le long de l'extrémité 78. Ces ouvertures 80 ont sensiblement une forme rectangulaire et sont disposées chacune en regard d'une paire de crochet 30/élément d'appui 32.As illustrated in FIG. 4, the rear edge 72 of the support plate 62 has at its free end 78 a series of openings 80 distributed along the end 78. These openings 80 have substantially a rectangular shape and are each arranged next to a pair of hook 30 / support member 32.

Pour monter l'unité de blanchet 3 sur le cylindre 2 on procède par exemple comme suit.To mount the blanket unit 3 on the cylinder 2, for example, as follows.

La broche 28 étant en position de libération, on commence par insérer le bord avant 66 de la plaque de support 62 dans la fente 14 puis on enroule l'unité de blanchet 3 autour du cylindre 2 jusqu'à venir engager le bord arrière 72 de la plaque de support 62 dans la fente 14. L'unité de blanchet 3 est alors dans la position de la figure 2.With the pin 28 in the release position, the front edge 66 of the support plate 62 is first inserted into the slot 14, then the blanket unit 3 is wound around the cylinder 2 to engage the rear edge 72 of the cylinder. the support plate 62 in the slot 14. The blanket unit 3 is then in the position of FIG.

On fait ensuite pivoter, grâce aux leviers 56 et aux mécanismes 42, la broche 28 de sa position de libération de la figure 2 jusqu'à sa position de fixation de la figure 6.Then, thanks to the levers 56 and mechanisms 42, the pin 28 is rotated from its release position in FIG. 2 to its fixing position of FIG. 6.

Au cours de cette rotation, l'extrémité libre 34 de chaque crochet 30 vient s'engager dans l'ouverture 80 correspondante du bord arrière 72 de la plaque de support 62 et l'élément d'appui 32 associé passe au travers de la même ouverture 80. Cela est illustré par la figure 5.During this rotation, the free end 34 of each hook 30 is engaged in the corresponding opening 80 of the rear edge 72 of the support plate 62 and the associated support element 32 passes through the same 80. This is illustrated in Figure 5.

Le mouvement de rotation de la broche 28 se poursuivant, chaque crochet 30, qui est fermement engagé contre la périphérie de l'ouverture 80 correspondante provoque progressivement la mise sous tension de la plaque de support 2 tandis que l'élément d'appui 32 associé, qui passe au travers de l'ouverture 80, va venir prendre appui sur le bord avant 66 de la plaque de support 62 et la plaquer contre la paroi avant 16 de la fente 14 et de la cavité 12.The rotational movement of the pin 28 continues, each hook 30, which is firmly engaged against the periphery of the corresponding opening 80, gradually causes the tensioning of the support plate 2 while the associated support element 32 , which passes through the opening 80, will bear on the front edge 66 of the support plate 62 and press against the front wall 16 of the slot 14 and the cavity 12.

On notera que chaque crochet 30 exerce sur le fond arrière 72 de la plaque de support 62 un effort de traction T sensiblement parallèle au bord arrière 72.It will be noted that each hook 30 exerts on the rear base 72 of the support plate 62 a traction force T substantially parallel to the rear edge 72.

A l'issue de ce mouvement, le bord arrière 72 de la plaque 62 est tiré par les crochets 30 en assurant ainsi une mise sous tension satisfaisante du blanchet 64 et le bord avant 66 de la plaque de support 2 est appliqué contre la paroi avant 16. On notera que le bord arrière 72 forme encore un angle non nul avec le bord avant 66 de la plaque de support 62.At the end of this movement, the trailing edge 72 of the plate 62 is pulled by the hooks 30 thus ensuring a satisfactory tensioning of the blanket 64 and the front edge 66 of the support plate 2 is applied against the front wall 16. It will be noted that the rear edge 72 still forms a non-zero angle with the front edge 66 of the support plate 62.

Ainsi, l'unité de blanchet 3 est fixée et tendue sur le cylindre 2 de manière satisfaisante.Thus, the blanket unit 3 is fixed and tensioned on the cylinder 2 satisfactorily.

Pour autant, les crochets 30 et les éléments d'appui 32 permettent, grâce à leur réalisation sous forme d'éléments élastiques, de légers déplacements des bords 66 et 72 de la plaque de support 2. Cela permet de s'adapter aux différentes contraintes de fonctionnement de la presse offset, et notamment au phénomène de dilatation thermique de la plaque de support 62 et au phénomène dit de « foulage ».However, the hooks 30 and the support elements 32 allow, thanks to their embodiment in the form of elastic elements, slight displacements of the edges 66 and 72 of the support plate 2. This allows to adapt to different constraints operation of the offset press, and in particular to the phenomenon of thermal expansion of the support plate 62 and the phenomenon called "crowding".

Ainsi, le bord arrière 72 de la plaque support 62 peut, sous l'effet de la dilatation thermique ou lors du phénomène dit de « foulage », pénétrer davantage dans la fente 14, les crochets 30 autorisant ce déplacement tout en maintenant l'unité de blanchet 3 sous tension.Thus, the rear edge 72 of the support plate 62 may, under the effect of the thermal expansion or during the phenomenon called "crowding", further penetrate the slot 14, the hooks 30 allowing this movement while maintaining the unit blanket 3 under tension.

Les éléments d'appui 32 forment des moyens 82 d'application du bord avant 66 de la plaque de support 62 sur la paroi 16 qui permettent de stabiliser l'unité de blanchet 3 sur le cylindre 2.The bearing elements 32 form means 82 for applying the front edge 66 of the support plate 62 to the wall 16 which makes it possible to stabilize the blanket unit 3 on the cylinder 2.

Ces moyens d'application 82 étant distincts des crochets 30, la stabilisation, la fixation et la tension de l'unité de blanchet 3 sont assurées de manière relativement simple.These application means 82 being separate from the hooks 30, the stabilization, fixing and tension of the blanket unit 3 are relatively simple.

En outre, l'utilisation des mêmes ouvertures 80 pour recevoir les crochets 30 et les éléments d'appui 32 permet de limiter le nombre d'ouvertures dans la plaque de support 62.In addition, the use of the same openings 80 for receiving the hooks 30 and the support elements 32 makes it possible to limit the number of openings in the support plate 62.

On notera également que l'utilisation d'ouvertures 80 dans la plaque de support 62 pour coopérer avec les crochets 30 permet à la plaque de support de ne pas présenter de bord arrière recourbé et donc de conserver une largeur l de fente 14 faible. L'inclinaison du bord arrière 72 de la plaque de support 62 par rapport à son bord avant 66 permet également à la fente 14 d'avoir une largeur amont l faible.Use should also be noted that apertures 80 in the support plate 62 for cooperating with the hooks 30 enables the support plate not to present curved rear edge and therefore to maintain a width of the slot 14 low. The inclination of the rear edge 72 of the support plate 62 with respect to its front edge 66 also allows the slot 14 to have a slight upstream width l .

Cette largeur l est d'autant plus faible que ni le bord avant 68 ni le bord arrière 74 du blanchet 64 ne pénètrent dans la fente 14.This width l is even lower than neither the front edge 68 nor the rear edge 74 of the blanket 64 penetrate the slot 14.

Cela permet de limiter fortement les oscillations lors du roulement des différents cylindres de la presse offset les uns sur les autres.This greatly limits the oscillations during the rolling of the different cylinders of the offset press on top of each other.

En outre, le blanchet 64 ne recouvrant pas tout le bord avant 66 de la plaque support 62, comme dans FR-2 573 347, la réalisation de l'unité de blanchet, et notamment le pliage de la plaque de support, sont simples et économiques, tout en limitant les vibrations en fonctionnement.In addition, the blanket 64 not covering the entire front edge 66 of the support plate 62, as in FR-2,573,347, the realization of the blanket unit, and in particular the folding of the support plate, are simple and economically, while limiting vibrations during operation.

Dans un autre mode de réalisation illustré par la figure 8, les moyens d'application 82 sont formés non pas par des éléments d'appui 32 appartenant au dispositif de fixation 26 mais par une région du bord arrière 72 de la plaque de support 62.In another embodiment illustrated in FIG. 8, the application means 82 are formed not by support members 32 belonging to the fixing device 26 but by a region of the rear edge 72 of the support plate 62.

Ainsi, ce bord arrière 72 présente un pli intermédiaire 84 délimitant dans le bord arrière 72 une région d'extrémité 86 dans laquelle les ouvertures 80 de réception des crochets 30 sont ménagées, et une région intermédiaire 88 repliée moins fortement par rapport au reste de la plaque de support 62. Cette région intermédiaire 88 est en appui sur le bord avant 66 de la plaque de support 62 et l'applique contre la paroi 16.Thus, this rear edge 72 has an intermediate fold 84 delimiting in the rear edge 72 an end region 86 in which the openings 80 for receiving the hooks 30 are formed, and an intermediate region 88 folded less strongly relative to the rest of the Support plate 62. This intermediate region 88 bears on the front edge 66 of the support plate 62 and applies it against the wall 16.

La figure 9 concerne un troisième mode de réalisation se distinguant de celui des figures 1 à 7 par le fait que les moyens 82 d'application du bord avant 66 de la plaque support 62 contre la paroi 16 ont été supprimés.Figure 9 relates to a third embodiment differing from that of Figures 1 to 7 in that the means 82 for applying the front edge 66 of the support plate 62 against the wall 16 have been removed.

Malgré l'absence des moyens 82 d'application, on a pu constater une fixation et une mise sous tension satisfaisante de l'unité de blanchet 3.Despite the lack of means 82 for application, it has been found satisfactory fixation and power of the blanket unit 3.

On notera que, pour chacun des modes de réalisation décrits ci-dessus, le cylindre et l'unité de blanchet peuvent être vendus indépendamment l'un de l'autre.Note that for each of the embodiments described above, the cylinder and the blanket unit may be sold independently of one another.

De manière générale, les principes ci-dessus peuvent être utilisés avec un cylindre 2 sur lequel deux unités de blanchets 3 sont fixées l'une à côté de l'autre le long de l'axe A du cylindre 2.In general, the above principles can be used with a cylinder 2 on which two blanket units 3 are attached next to each other along the axis A of the cylinder 2.

Les dispositifs de fixation 42 associés à chaque unité de blanchet 3 peuvent être décalés angulairement l'un de l'autre par rapport à l'axe A, par exemple de 180°. Ainsi, les fentes 14 associées à chaque unité de blanchet 3 sont diamétralement opposées, ce qui limite les vibrations engendrées lors du roulement sur les autres cylindres de la presse, et ne s'étendent pas sur toute la longueur du cylindre 2.The fasteners 42 associated with each blanket unit 3 may be angularly offset from each other with respect to the axis A, for example 180 °. Thus, the slots 14 associated with each blanket unit 3 are diametrically opposed, which limits the vibrations generated during the rolling on the other rolls of the press, and do not extend over the entire length of the cylinder 2.

Claims (8)

  1. Assembly (1) for offset press, of the type comprising:
    - An impression blanket unit (3), comprising a blanket (64) and a plate (62) to support the blanket, the front (66) and rear (72) edges of the support plate (62) being folded respectively to the level of a front fold (70) and a rear fold (76), the rear edge (72) of the support plate (62) extending beyond the rear edge (74) of the blanket which is situated in the vicinity of the rear fold (76), an aperture (80) being provided in the rear edge (72) of the support plate (62), and
    - a cylinder (2) exhibiting a slot (14) for accommodating the front and rear edges of the support plate (62), the cylinder (2) comprising a device (28) for fixing the blanket unit (3) on the cylinder, the fixing device (28) comprising at least one hook (30) for tensioning the blanket unit, the hook (30) being intended to be accommodated in the aperture (80) of the rear edge (72) of the support plate (62) inserted in the slot in order to exercise a traction force on the support plate (62) essentially parallel to its rear edge (72),characterised in that the front edge (66) of the support plate (62) projects beyond the front edge (68) of the blanket, which is situated in the vicinity of the front fold (70), in that the assembly comprises means (82) for the application of the front edge (66) of the support plate (62) against the front wall (16) of the slot (14), these application means (82) being distinct from the hook (30), in that the means (82) of application comprise at least one support element (32) on the front edge (66) of the support plate (62), the support element (32) belonging to the fixing device (26) and being distinct from the support plate (62), and in that the support element (32), in order to be supported on the front edge (66) of the support plate (62), passes across the aperture (80) accommodating the hook (30).
  2. Assembly according to Claim 1, characterised in that the aperture (80) is arranged in an area of the rear edge (72) of the support plate (62) forming an angle (α) which is not zero with the front edge (66) of the support plate (62).
  3. Assembly according to Claim 1 or 2, characterised in that the hook (30) comprises an elastic blade.
  4. Assembly according to one of the foregoing Claims, characterised in that the support element (32) comprises an elastic blade.
  5. Assembly according to one of the foregoing Claims, characterised in that the slot (14) has a width (l) in the vicinity of the peripheral surface of the cylinder of less than 1.5 mm.
  6. Assembly according to Claim 5, characterised in that the said width (l) of the slot is less than 1.1 mm.
  7. Assembly according to one of the foregoing Claims, characterised in that the front (16) and rear (20) walls of the slot (14) form, from the peripheral surface of the cylinder (2), an angle (α) of less than 20°.
  8. Offset press, characterised in that it comprises an assembly according to one of Claims 1 to 7.
EP03292193A 2002-09-19 2003-09-05 Device with a blanket and a blanket cylinder;cylinder, blanket and printing machine Expired - Lifetime EP1400356B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0211620 2002-09-19
FR0211620A FR2844743B1 (en) 2002-09-19 2002-09-19 ASSEMBLY COMPRISING A BLANKET UNIT AND A CYLINDER WITH BLANKET FASTENING DEVICE, CYLINDER, BLANKET UNIT AND OFFSET PRESS THEREOF

Publications (3)

Publication Number Publication Date
EP1400356A2 EP1400356A2 (en) 2004-03-24
EP1400356A3 EP1400356A3 (en) 2004-04-28
EP1400356B1 true EP1400356B1 (en) 2006-06-14

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EP03292193A Expired - Lifetime EP1400356B1 (en) 2002-09-19 2003-09-05 Device with a blanket and a blanket cylinder;cylinder, blanket and printing machine

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US (1) US6901857B2 (en)
EP (1) EP1400356B1 (en)
JP (1) JP4703109B2 (en)
CN (1) CN1307052C (en)
DE (1) DE60306057T2 (en)
FR (1) FR2844743B1 (en)
HK (1) HK1064069A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10250684B3 (en) * 2002-10-31 2004-04-01 Koenig & Bauer Ag Production of a rotational body of a printing machine comprises forming profiled bodies by welding material to opposite-lying walls of a groove in the peripheral direction of the balls in the machine
JP5294736B2 (en) * 2008-07-07 2013-09-18 西研グラフィックス株式会社 Blanket fixing device for rotary printing press
EP2358535A1 (en) * 2008-11-03 2011-08-24 Trelleborg Engineered Systems Italy S.p.A. Finishing element of a coating for a typographic cylinder and manufacturing and finishing method thereof, coating of a typographic cylinder and manufacturing method thereof, typographic cylinder comprising such a coating, and method of application of such a coating to the typographic cylinder
WO2013042104A1 (en) * 2011-09-25 2013-03-28 Hewlett Packard Indigo B.V. Blanket tensioning device
NL2020109B1 (en) 2017-12-18 2019-06-25 Xeikon Prepress Nv Method for fixing and treating a flexible plate on a drum, and flexible plate for use therein
DE102019111510A1 (en) * 2019-05-03 2020-11-05 Koenig & Bauer Ag Printing unit for an offset printing machine with a rubber cylinder carrying at least one rubber blanket and a method for handling a rubber blanket

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8433674U1 (en) 1984-11-16 1985-02-14 Maschinenfabrik Wifag, Bern DEVICE FOR MOUNTING A RUBBER BLANKET ON A RUBBER BLANKET CYLINDER OF A ROTARY PRINTING MACHINE
DE4415683C2 (en) * 1994-05-04 1998-04-09 Roland Man Druckmasch Device for attaching a flexible pressure plate
DE19509559C2 (en) * 1995-03-16 1997-01-23 Koenig & Bauer Albert Ag Jig
DE19509563C2 (en) * 1995-03-16 1997-01-23 Koenig & Bauer Albert Ag Cylinder with a device for clamping plates
CH691452A5 (en) * 1995-05-05 2001-07-31 Koenig & Bauer Ag Device for attaching a blanket unit on a blanket cylinder.
DE29600845U1 (en) 1996-01-19 1996-03-07 MAN Roland Druckmaschinen AG, 63075 Offenbach Device for fastening a covering on a printing unit cylinder
DE19642141C1 (en) * 1996-10-12 1998-06-18 Koenig & Bauer Albert Ag Device for releasing plates
DE19924786B4 (en) * 1999-05-29 2004-11-04 Koenig & Bauer Ag Device for attaching a flexible plate to a cylinder of a rotary printing press
JP3461487B2 (en) * 2000-07-06 2003-10-27 株式会社東京機械製作所 Printing cylinder mounting device, printing plate and blanket
JP3446122B2 (en) * 2000-07-12 2003-09-16 株式会社東京機械製作所 Blanket torso
DE10060171C1 (en) * 2000-12-04 2002-05-23 Koenig & Bauer Ag Sleeve retainer for printing cylinder has sprung detent to engage ridge formed on flange at end of the sleeve panel
DE10060984B4 (en) * 2000-12-08 2006-10-26 Man Roland Druckmaschinen Ag Vorichtung for attaching a clothing on a printing cylinder

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JP2004268564A (en) 2004-09-30
JP4703109B2 (en) 2011-06-15
CN1495018A (en) 2004-05-12
EP1400356A2 (en) 2004-03-24
FR2844743B1 (en) 2004-12-17
US20040216629A1 (en) 2004-11-04
FR2844743A1 (en) 2004-03-26
HK1064069A1 (en) 2005-01-21
CN1307052C (en) 2007-03-28
US6901857B2 (en) 2005-06-07
DE60306057T2 (en) 2007-01-04
DE60306057D1 (en) 2006-07-27
EP1400356A3 (en) 2004-04-28

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