EP1400356A2 - 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
EP1400356A2
EP1400356A2 EP03292193A EP03292193A EP1400356A2 EP 1400356 A2 EP1400356 A2 EP 1400356A2 EP 03292193 A EP03292193 A EP 03292193A EP 03292193 A EP03292193 A EP 03292193A EP 1400356 A2 EP1400356 A2 EP 1400356A2
Authority
EP
European Patent Office
Prior art keywords
support plate
blanket
cylinder
slot
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03292193A
Other languages
German (de)
French (fr)
Other versions
EP1400356A3 (en
EP1400356B1 (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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Filing date
Publication date
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
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • 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

  • Such a press conventionally comprises, in addition to the blanket cylinder and blanket, a plate cylinder and a plate, and a cylinder pressure.
  • the plate carried by the plate cylinder is moistened then inked.
  • the plate transfers the ink from its printing regions on the blanket carried by the blanket cylinder.
  • the blanket then transfers the ink on the paper to be printed which passes between the blanket cylinder and the pressure cylinder.
  • FR-2,573,347 has proposed a set of the aforementioned type.
  • the front edge blanket covers the entire front edge of the support plate and therefore penetrates in the cylinder slot.
  • the rear edge of the blanket does not penetrate the slot and is applied substantially against the front fold region of the blanket.
  • the gap between the start 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 proposed another solution in which the device for fixing the blanket unit includes pressure pads which come apply the front and rear edges of the support plate against the front wall from the slot. These front and rear edges of the support plate are not coated by the blanket. The efforts exerted by the studs are exclusively perpendicular to the front and rear edges of the support plate.
  • the fixing device described does not absorb deformations of the blanket unit resulting from offset press operation.
  • the dilations of the plate of support cannot be absorbed so that ruptures of the latter in the vicinity of its rear fold.
  • FR-2 745 524 has proposed replacing the pressure pads with one or more several elastic blades. However, this arrangement still does not allow reaching a satisfactory blanket unit tension.
  • An object of the invention is to provide a set of the aforementioned type which allows to tension and fix the blanket unit on the cylinder so satisfactory, and which is simple and economical to produce.
  • the invention relates to an assembly of the aforementioned type, characterized in that the front edge of the support plate projects beyond the front edge of the blanket which is located near the front fold.
  • the invention also relates to a cylinder for an assembly such as defined above.
  • the fixing device comprises at least one support element on the front edge of the support plate to press it against the front wall of the slot, the support element being separate from the hook.
  • the invention further relates to a blanket unit for a together as defined above.
  • the rear edge of the support plate is itself folded at an intermediate fold defining an end region in which the hook receiving opening is provided, and a region intermediate intended to rest against the front edge of the support plate to apply it against the front wall of the slot.
  • the invention also relates to an offset press comprising a together as defined above.
  • Figure 1 schematically illustrates a set 1 for offset press which includes a cylinder 2 and a blanket unit 3 surrounding the surface device 4 of cylinder 2 and carried by cylinder 2.
  • Cylinder 2 extends along a longitudinal axis A and its ends longitudinal 5, only one of which is visible in FIG. 1, are intended to be received in bearings of the frame of an offset press. So cylinder 2 can, thanks to conventional training means not shown, turn around from its longitudinal axis A in a direction illustrated by arrow 6 in FIG. 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 part of the peripheral surface 4 of the cylinder 2.
  • This insert 10 delimits inside the cylinder 2 a cavity 12 longitudinal section of substantially rectangular and a longitudinal slot 14 of substantially triangular section.
  • the slot 14 opens into the peripheral surface 4 of the cylinder 2 and in the cavity 12.
  • 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 of width of approximately 1 mm.
  • This chamfer 22 has for example a width about 1.4mm.
  • the front 16 and rear 20 walls of the slot 14 diverge in approaching the cavity 12, that is to say from upstream to downstream of the slot 14.
  • the walls 16 and 20 thus form between them an angle ⁇ typically of about 14.8 °. More generally, this angle ⁇ will be less than 20 °.
  • the upstream width l of the slot 14 between the walls 16 and 20, that is to say downstream of the chamfers 18 and 22, is approximately 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 unit of blanket 3 on the cylinder 2.
  • This device 26 is housed in the cavity 12 and comprises a spindle 28 extending along a substantially parallel axis X-X to the axis A of the cylinder 2.
  • This pin 28 extends for example all along the cylinder 2.
  • hooks 30 and elements support 32 are distributed along the spindle 28.
  • the hooks 30 are formed by elastic blades whose free ends 34 are curved opposite the slot 14.
  • the support elements 32 are formed by blades elastic whose free ends 36 are bent 180 °.
  • the hooks 30 and the support elements 32 are associated in pairs, the hook 30 and the associated support element 32 being fixed by a common screw 38 on the spindle 28.
  • the support element 32 is arranged above the hook 30 associated.
  • the hook 30 / support element 32 pairs are spaced longitudinally of each other and distributed along the spindle 28.
  • the spindle 28 is rotatably mounted around its longitudinal axis X-X in the cavity 12, for example by means of bearings provided at the ends of the pin 28 and possibly in intermediate regions thereof.
  • Pin 28 is thus movable between two illustrated positions Figures 2 and 6 respectively.
  • 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 via an articulation allowing it to pivot in a plane orthogonal to the axis A of the cylinder 2.
  • the spring 50 takes support on the one hand on the block 44 and moreover on the collar 48.
  • the rod 46 can move relative to the support 44 between two stable extreme positions.
  • the first extreme stable position is shown in Figure 1. This position corresponds to the release position of the pin 28 illustrated by Figure 2.
  • the second extreme stable position is shown in FIG. 7.
  • the pin 28 is in its fixing position illustrated by the figure 6.
  • the rod 46 will then pass through an unstable neutral position where its axis will cut the axis X-X of the spindle 28.
  • the spring 50 is then compressed so that it will push the rod 46 back to its second stable position, i.e. that of FIG. 7.
  • the block 52 is then in abutment against an adjustable stop 58 which adjusts the angular position of the spindle 28 in its position fixation.
  • the neutral point crossing mechanism 42 makes it possible to manually move pin 28 from its release position to its position fixing and vice versa. Note however that any other type of mechanism 42 can be used.
  • the blanket unit 3 includes a support plate 62 and a blanket 64 fixed on the support plate support 62.
  • the support plate 62 is for example made of stainless steel. His thickness is about 0.2mm.
  • the blanket 64 conventionally comprises for example several layers of elastomer and fabric.
  • the blanket 64 is fixed to the support plate 62 by bonding or vulcanization.
  • the front edge 66 of the support plate 62 extends beyond the edge front 68 of the blanket 64.
  • the front edge 66 of the support plate 62 is folded at a front fold 70 to form with the rest of the plate 62 an angle ⁇ acute.
  • the front edge 68 of the blanket 64 is disposed slightly recessed by compared to fold 70.
  • the front edge 68 can come forward to cover at least partially the fold 70.
  • the edge before 68 will be located in the vicinity of the fold 70 so as not to enter the slot 14.
  • the front 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 front wall 16 of the slot 14.
  • the blanket unit 3 has a similar configuration at the rear with 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 rear fold 76 by relative to the rest of the support plate 62 by 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 rear edge 74 of the blanket 64 is disposed in the vicinity of the fold rear 22 so as not to enter 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 inside the slot 14 into the cavity 12 and form between them a non-zero angle.
  • the rear edge 72 of the plate support 62 has at its free end 78 a series of openings 80 distributed along the end 78. These openings 80 have substantially a shape rectangular and are each arranged opposite a pair of hooks 30 / support element 32.
  • Pin 28 is in the release position, we start by inserting the front edge 66 of the support plate 62 in the slot 14 and then wrapped the blanket unit 3 around the cylinder 2 until it engages the rear edge 72 of the support plate 62 in the slot 14. The blanket unit 3 is then in the position of figure 2.
  • each hook 30 engages 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 opening 80. This is illustrated in FIG. 5.
  • each hook 30, which is firmly engaged against the periphery of the opening 80 gradually causes the plate to energize support 2 while the associated support element 32, which passes through the opening 80, will come to bear on the front edge 66 of the plate support 62 and press it against the front wall 16 of the slot 14 and the cavity 12.
  • each hook 30 exerts on the rear bottom 72 of the support plate 62 a tensile force T substantially parallel to the edge rear 72.
  • the rear edge 72 of the plate 62 is pulled by the hooks 30, thereby ensuring 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 of satisfactorily.
  • the hooks 30 and the support elements 32 allow, thanks to their realization in the form of elastic elements, light displacements of the edges 66 and 72 of the support plate 2. This allows adapt to the different operating constraints of the offset press, and in particular to the phenomenon of thermal expansion of the support plate 62 and to the phenomenon known as "crushing".
  • the rear edge 72 of the support plate 62 may, under the effect of the thermal expansion or during the so-called “fulling” phenomenon, penetrate further in the slot 14, the hooks 30 authorizing this movement while maintaining the blanket unit 3 powered up.
  • the support elements 32 form means 82 for applying the edge front 66 of the support plate 62 on the wall 16 which make it possible to stabilize the blanket unit 3 on the cylinder 2.
  • openings 80 in the support plate 62 to cooperate with the hooks 30 allows the support plate not to have a curved rear edge and therefore to keep a width l of slot 14 small.
  • 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 small upstream width l .
  • This width l is all the smaller since neither the front edge 68 nor the rear edge 74 of the blanket 64 penetrate into the slot 14.
  • the blanket 64 does not cover the entire front edge 66 of the support plate 62, as in FR-2 573 347, the production of the blanket, and in particular the folding of the support plate, are simple and economical, while limiting vibrations during operation.
  • the means 82 are not formed by support elements 32 belonging to the fastening device 26 but by a region of the rear edge 72 of the plate support 62.
  • this rear edge 72 has an intermediate fold 84 defining in the rear edge 72 an end region 86 in which the openings 80 receiving hooks 30 are provided, and an intermediate region 88 folded less strongly relative to the rest of the support plate 62.
  • This intermediate region 88 is supported on the front edge 66 of the support plate 62 and applies it against the wall 16.
  • FIG. 9 relates to a third embodiment which stands out from that of FIGS. 1 to 7 by the fact that the means 82 for applying the edge before 66 of the support plate 62 against the wall 16 have been removed.
  • cylinder and blanket unit can be sold independently one of the other.
  • the fixing devices 42 associated with each blanket unit 3 can be angularly offset from each other with respect to the axis A, by example of 180 °.
  • the slots 14 associated with each blanket unit 3 are diametrically opposed, which limits the vibrations generated during bearing on the other cylinders of the press, and do not extend over the entire length of 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)

Abstract

The assembly for the offset press comprises a blanket unit (3) comprising a blanket (64) and a blanket support plate (62). The front (66) and rear (72) edges of the support are folded and extend beyond the blanket front and rear edges. A cylinder (2) having a reception slot (14) for the support plate edges comprises a fixing device (28) for the blanket unit comprising a tension hook (30). An Independent claim is included for an offset press comprising a blanket unit and cylinder assembly.

Description

La présente invention concerne un ensemble pour presse offset du type comprenant :

  • une unité de blanchet comprenant un blanchet et une plaque de support du blanchet, les bords avant et arrière de la plaque de support étant repliés respectivement au niveau d'un pli avant et d'un pli arrière, le bord arrière de la plaque de support faisant saillie au-delà du bord arrière du blanchet qui est situé au voisinage du pli arrière, et
  • un cylindre présentant une fente de réception des bords avant et arrière de la plaque de support, le cylindre comprenant un dispositif de fixation de l'unité de blanchet sur le cylindre, le dispositif de fixation comprenant au moins un crochet de tension de l'unité de blanchet, le crochet étant destiné à être reçu dans une ouverture du bord arrière de la plaque de support inséré dans la fente, pour exercer sur la plaque de support un effort de traction sensiblement parallèle à son bord arrière.
The present invention relates to an assembly for offset press of the type comprising:
  • a blanket unit comprising a blanket and a blanket support plate, the front and rear edges of the support plate being folded respectively at a front fold and a rear fold, the rear edge of the support plate projecting beyond the rear edge of the blanket which is located in the vicinity of the rear fold, and
  • a cylinder having a slot for receiving the front and rear edges of the support plate, the cylinder comprising a device for fixing the blanket unit to the cylinder, the fixing device comprising at least one tensioning hook of the unit blanket, the hook being intended to be received in an opening of the rear edge of the support plate inserted in the slot, to exert on the support plate a tensile force substantially parallel to its rear edge.

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 blanket, a plate cylinder and a plate, and a cylinder pressure.

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 then inked. The plate transfers the ink from its printing regions on the blanket carried by the blanket cylinder. The blanket then transfers the ink on the paper to be printed which 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 stretch the blanket on the cylinder, we traditionally used metal bars crimped at the ends of the blanket. These bars were engaged in the cylinder slot, 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 wide slit widths large, 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 slots causes, when rolling the blanket cylinder against the plate cylinder and against the pressure, shock and vibration. Such vibrations limit the speed of rotation of the different cylinders and therefore the production capacities of the presses offset.

FR-2 573 347 a proposé un ensemble du type précité. 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 a set of the aforementioned type. The front edge blanket covers the entire front edge of the support plate and therefore penetrates in the cylinder slot. The rear edge of the blanket does not penetrate the slot and is applied substantially against the front fold region of the blanket. Thus, the gap between the start 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 to be extremely difficult to bend the edge front of the plate and the front edge of the blanket in order to achieve the configuration desired 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 proposed another solution in which the device for fixing the blanket unit includes pressure pads which come apply the front and rear edges of the support plate against the front wall from the slot. These front and rear edges of the support plate are not coated by the blanket. The efforts 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 was found that this arrangement did not allow to tend to satisfactorily the blanket unit. In addition, the fixing device described does not absorb deformations of the blanket unit resulting from offset press operation. In particular, the dilations of the plate of support cannot be absorbed so that ruptures of the latter 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 has proposed replacing the pressure pads with one or more several elastic blades. However, this arrangement still does not allow reaching a satisfactory blanket unit tension.

Un but de l'invention est de fournir un ensemble du type précité 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 a set of the aforementioned type which allows to tension and fix the blanket unit on the cylinder so satisfactory, and which is simple and economical to produce.

A cet effet, l'invention a pour objet un ensemble du type précité, caractérisé en ce que le bord avant de la plaque de support fait saillie au-delà du bord avant du blanchet qui est situé au voisinage du pli avant.To this end, the invention relates to an assembly of the aforementioned type, characterized in that the front edge of the support plate projects beyond the front edge of the blanket which is located near the front fold.

Selon des modes particuliers de réalisation, l'ensemble peut comprendre l'une ou plusieurs des caractéristiques suivantes, prise(s) isolément ou selon toutes les combinaisons techniquement possible(s) :

  • l'ouverture est ménagée dans une région du bord arrière de la plaque de support formant un angle non nul avec le bord avant de la plaque de support,
  • le crochet comprend une lame élastique,
  • l'ensemble comprend des moyens d'application du bord avant de la plaque de support contre la paroi avant de la fente, ces moyens d'application étant distincts du crochet,
  • les moyens d'application comprennent au moins un élément d'appui sur le bord avant de la plaque de support, l'élément d'appui appartenant au dispositif de fixation et étant distinct de la plaque de support,
  • l'élément d'appui passe, pour venir s'appuyer sur le bord avant de la plaque de support, au travers de l'ouverture recevant le crochet,
  • l'élément d'appui comprend une lame élastique,
  • le bord arrière de la plaque de support est lui-même plié au niveau d'un pli intermédiaire délimitant une région d'extrémité dans laquelle l'ouverture de réception du crochet est ménagée, et une région intermédiaire destinée à s'appuyer contre le bord avant de la plaque de support et formant ainsi les moyens d'application,
  • la fente a une largeur à proximité de la surface périphérique du cylindre inférieure à 1,5mm,
  • ladite largeur de la fente est inférieure à 1,1 mm,
  • les parois avant et arrière de la fente forment, depuis la surface périphérique du cylindre, un angle inférieur à 20°,
According to particular embodiments, the assembly may include one or more of the following characteristics, taken in isolation or in any technically possible combination (s):
  • the opening is made in a region of the rear edge of the support plate forming a non-zero angle with the front edge of the support plate,
  • the hook includes an elastic blade,
  • the assembly includes means for applying the front edge of the support plate against the front wall of the slot, these application means being distinct from the hook,
  • the application means comprise at least one support element on the front edge of the support plate, the support element belonging to the fixing device and being distinct from the support plate,
  • the support element passes, to come to bear on the front edge of the support plate, through the opening receiving the hook,
  • the support element comprises an elastic blade,
  • the rear edge of the support plate is itself folded at an intermediate fold delimiting an end region in which the opening for receiving the hook is formed, and an intermediate region intended to bear against the edge front of the support plate and thus forming the application means,
  • the slot has a width near the peripheral surface of the cylinder of less than 1.5 mm,
  • said width of the slot is less than 1.1 mm,
  • the front and rear walls of the slot form, from the peripheral surface of the cylinder, an angle of less than 20 °,

L'invention a également pour objet un cylindre pour un ensemble tel que défini ci-dessus.The invention also relates to a cylinder for an assembly such as defined above.

Selon une variante le dispositif de fixation comprend au moins un élément d'appui sur le bord avant de la plaque de support pour l'appliquer contre la paroi avant de la fente, l'élément d'appui étant distinct du crochet.According to a variant, the fixing device comprises at least one support element on the front edge of the support plate to press it against the front wall of the slot, the support element being separate from the hook.

L'invention a en outre pour objet une unité de blanchet pour un ensemble tel que défini ci-dessus.The invention further relates to a blanket unit for a together as defined above.

Selon une variante le bord arrière de la plaque de support est lui-même plié au niveau d'un pli intermédiaire délimitant une région d'extrémité dans laquelle l'ouverture de réception du crochet est ménagée, et une région intermédiaire destinée à s'appuyer contre le bord avant de la plaque de support pour l'appliquer contre la paroi avant de la fente.According to a variant the rear edge of the support plate is itself folded at an intermediate fold defining an end region in which the hook receiving opening is provided, and a region intermediate intended to rest against the front edge of the support plate to apply it against the front wall of the slot.

L'invention a également pour objet une presse offset comprenant un ensemble tel que défini ci-dessus. The invention also relates to an offset press comprising a together as defined above.

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'entraínement 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 made 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 view, enlarged and in cross section illustrating the device for fixing the blanket unit of the assembly of FIG. 1,
  • FIG. 3 is a partial schematic view from above illustrating part of the pin of the fixing device in FIG. 2,
  • FIG. 4 is a partial schematic 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 stages 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 drive mechanism of the fixing 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.Figure 1 schematically illustrates a set 1 for offset press which includes a cylinder 2 and a blanket unit 3 surrounding the surface device 4 of cylinder 2 and carried by 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'entraínement classiques non-représentés, tourner autour de son axe longitudinal A dans un sens illustré par la flèche 6 sur la figure 1.Cylinder 2 extends along a longitudinal axis A and its ends longitudinal 5, only one of which is visible in FIG. 1, are intended to be received in bearings of the frame of an offset press. So cylinder 2 can, thanks to conventional training means not shown, turn around from its longitudinal axis A in a direction illustrated by arrow 6 in FIG. 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 “front” and “rear” used will be understood with respect 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 part 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 delimits inside the cylinder 2 a cavity 12 longitudinal section of substantially rectangular 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 in 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 part 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 of width of 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 at the peripheral surface 4. This chamfer 22 has for example a width about 1.4mm.

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 a typiquement d'environ 14,8°. Plus généralement, cet angle α sera inférieur à 20°.The front 16 and rear 20 walls of the slot 14 diverge in approaching the cavity 12, that is to say from upstream to downstream of the slot 14. The walls 16 and 20 thus form between them an angle α typically of about 14.8 °. More generally, this angle α will be less than 20 °.

La largeur amont l 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 l of the slot 14 between the walls 16 and 20, that is to say downstream of the chamfers 18 and 22, is approximately 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 unit of blanket 3 on the cylinder 2. This device 26 is housed in the cavity 12 and comprises a spindle 28 extending along a substantially parallel axis X-X 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 in FIGS. 2 and 3, hooks 30 and elements support 32 are distributed along the spindle 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 curved 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 blades elastic whose free ends 36 are bent 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 associated support element 32 being fixed by a common screw 38 on the spindle 28. The support element 32 is arranged above 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 30 / support element 32 pairs are spaced longitudinally of each other and distributed along the spindle 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 spindle 28 is rotatably mounted around its longitudinal axis X-X in the cavity 12, for example by means of bearings provided at the ends of the pin 28 and possibly in intermediate regions thereof.

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

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 figure 2, or position of release of the unit blanket 3, the hooks 30 and the support elements 32 are spaced from the slot 14 and free 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 figure 6, or position of fixing of the unit of blanket 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'entraínement 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 counterclockwise as seen in these figures. This pivoting can be ensured by means of drive mechanisms 42, one of which only one is visible in Figure 1, the other being of similar structure and arranged the other side of cylinder 2. Thus, only the mechanism 42 visible in FIG. 1 will be described later.

Ce mécanisme d'entraínement 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 include
  • a support 44 fixed on a side of the cylinder,
  • a rod 46 provided with a collar 48 and surrounded by a spring 50,
  • a block 52 fixed to the corresponding longitudinal end 54 of the pin 28, and
  • a removable actuating lever 56 shown in dotted lines in FIG. 1.

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 via an articulation allowing it to pivot in a plane orthogonal to the axis A of the cylinder 2. The spring 50 takes support on the one hand on the block 44 and moreover on the collar 48.

Grâce au levier 56, la tige 46 peut se déplacer par rapport au support 44 entre deux positions extrêmes stables.Thanks to the lever 56, the rod 46 can move relative to the support 44 between two stable extreme 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 extreme stable position is shown in Figure 1. This position corresponds to the release position of the pin 28 illustrated by Figure 2.

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 extreme stable position is shown in FIG. 7. In this position, the pin 28 is in its fixing position illustrated by the figure 6.

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 go from the position of figure 1 to that of figure 7, a operator rotates lever 56 counterclockwise as shown in the arrow 60 in FIG. 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 X-X of the spindle 28. The spring 50 is then compressed so that it will push the rod 46 back to its second stable position, i.e. that of FIG. 7. The block 52 is then in abutment against an adjustable stop 58 which adjusts the angular position of the spindle 28 in its position fixation.

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'entraínement 42 peut être utilisé.Thus, the neutral point crossing mechanism 42 makes it possible to manually move pin 28 from its release position to its position fixing and vice versa. Note however that any other type of mechanism 42 can 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 includes a support plate 62 and a blanket 64 fixed on the support plate support 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. His 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 conventionally comprises for example several layers of elastomer and fabric. The blanket 64 is fixed to the support plate 62 by bonding 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 front edge 66 of the support plate 62 extends beyond the edge front 68 of the blanket 64. The front edge 66 of the support plate 62 is folded at a front fold 70 to form with the rest of the plate 62 an angle β acute.

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 disposed slightly recessed by compared to fold 70. However, in certain variants, the front edge 68 can come forward to cover at least partially the fold 70. Anyway, the edge before 68 will be located in the vicinity of the fold 70 so as 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 front 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 front wall 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 similar configuration at the rear with 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 rear fold 76 by relative to the rest of the support plate 62 by 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 rear edge 74 of the blanket 64 is disposed in the vicinity of the fold rear 22 so as not to enter 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 inside the slot 14 into the cavity 12 and form between them a non-zero angle.

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 plate support 62 has at its free end 78 a series of openings 80 distributed along the end 78. These openings 80 have substantially a shape rectangular and are each arranged opposite a pair of hooks 30 / support element 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, proceed by 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.Pin 28 is in the release position, we start by inserting the front edge 66 of the support plate 62 in the slot 14 and then wrapped the blanket unit 3 around the cylinder 2 until it engages the rear edge 72 of the support plate 62 in the slot 14. The blanket unit 3 is then in the position of figure 2.

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 to the mechanisms 42, the pin 28 from its release position in FIG. 2 to its fixing position in Figure 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 engages 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 opening 80. This is illustrated in FIG. 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 spindle 28 continuing, each hook 30, which is firmly engaged against the periphery of the opening 80 gradually causes the plate to energize support 2 while the associated support element 32, which passes through the opening 80, will come to bear on the front edge 66 of the plate support 62 and press it 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 bottom 72 of the support plate 62 a tensile force T substantially parallel to the edge rear 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 rear edge 72 of the plate 62 is pulled by the hooks 30, thereby ensuring 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 of 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 realization in the form of elastic elements, light displacements of the edges 66 and 72 of the support plate 2. This allows adapt to the different operating constraints of the offset press, and in particular to the phenomenon of thermal expansion of the support plate 62 and to the phenomenon known as "crushing".

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 so-called “fulling” phenomenon, penetrate further in the slot 14, the hooks 30 authorizing this movement while maintaining the blanket unit 3 powered up.

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 support elements 32 form means 82 for applying the edge front 66 of the support plate 62 on the wall 16 which make 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 distinct from the hooks 30, the stabilization, fixation and tension of the blanket unit 3 are ensured relatively simple way.

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 to receive 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.It will also be noted that the use of openings 80 in the support plate 62 to cooperate with the hooks 30 allows the support plate not to have a curved rear edge and therefore to keep a width l of slot 14 small. 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 small 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 all the smaller since neither the front edge 68 nor the rear edge 74 of the blanket 64 penetrate into 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 does not cover the entire front edge 66 of the support plate 62, as in FR-2 573 347, the production of the blanket, and in particular the folding of the support plate, are simple and economical, 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 by FIG. 8, the means 82 are not formed by support elements 32 belonging to the fastening device 26 but by a region of the rear edge 72 of the plate support 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 defining in the rear edge 72 an end region 86 in which the openings 80 receiving hooks 30 are provided, and an intermediate region 88 folded less strongly relative to the rest of the support plate 62. This intermediate region 88 is supported 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.FIG. 9 relates to a third embodiment which stands out from that of FIGS. 1 to 7 by the fact that the means 82 for applying the edge before 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 absence of the means 82 of application, it has been possible to observe a fastening and satisfactory powering 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.It will be noted that, for each of the embodiments described above, cylinder and blanket unit can be sold independently one of the other.

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 fixed one beside on the other along the axis A of 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 fixing devices 42 associated with each blanket unit 3 can be angularly offset from each other with respect to the axis A, by example of 180 °. Thus, the slots 14 associated with each blanket unit 3 are diametrically opposed, which limits the vibrations generated during bearing on the other cylinders of the press, and do not extend over the entire length of cylinder 2.

Claims (16)

Ensemble (1 ) pour presse offset, du type comprenant : une unité de blanchet (3) comprenant un blanchet (64) et une plaque (62) de support du blanchet, les bords avant (66) et arrière (72) de la plaque de support (62) étant repliés respectivement au niveau d'un pli avant (70) et d'un pli arrière (76), le bord arrière (72) de la plaque de support (62) faisant saillie au-delà du bord arrière (74) du blanchet qui est situé au voisinage du pli arrière (76), et un cylindre (2) présentant une fente (14) de réception des bords avant et arrière de la plaque de support (62), le cylindre (2) comprenant un dispositif (28) de fixation de l'unité de blanchet (3) sur le cylindre, le dispositif de fixation (28) comprenant au moins un crochet (30) de tension de l'unité de blanchet, le crochet (30) étant destiné à être reçu dans une ouverture (80) du bord arrière (72) de la plaque de support (62) inséré dans la fente, pour exercer sur la plaque de support (62) un effort de traction sensiblement parallèle à son bord arrière (72),    caractérisé en ce que le bord avant (66) de la plaque de support (62) fait saillie au-delà du bord avant (68) du blanchet qui est situé au voisinage du pli avant (70).Set (1) for offset press, of the type comprising: a blanket unit (3) comprising a blanket (64) and a blanket support plate (62), the front (66) and rear (72) edges of the support plate (62) being folded respectively at a front fold (70) and a rear fold (76), the rear edge (72) of the support plate (62) projecting beyond the rear edge (74) of the blanket which is located in the vicinity of the fold rear (76), and a cylinder (2) having a slot (14) for receiving the front and rear edges of the support plate (62), the cylinder (2) comprising a device (28) for fixing the blanket unit (3) to the cylinder, the fixing device (28) comprising at least one hook (30) for tensioning the blanket unit, the hook (30) being intended to be received in an opening (80) in the rear edge (72) of the support plate (62) inserted into the slot, to exert on the support plate (62) a tensile force substantially parallel to its rear edge (72), characterized in that the front edge (66) of the support plate (62) projects beyond the front edge (68) of the blanket which is located in the vicinity of the front fold (70). Ensemble selon la revendication 1, caractérisé en ce que l'ouverture (80) est ménagée dans une région du bord arrière (72) de la plaque de support (62) formant un angle (α) non nul avec le bord avant (66) de la plaque de support (62).Assembly according to claim 1, characterized in that the opening (80) is formed in a region of the rear edge (72) of the support plate (62) forming a non-zero angle (α) with the front edge (66) of the support plate (62). Ensemble selon la revendication 1 ou 2, caractérisé en ce que le crochet (30) comprend une lame élastique.Assembly according to claim 1 or 2, characterized in that the hook (30) comprises an elastic blade. Ensemble selon l'une des revendications précédentes, caractérisé en ce qu'il comprend des moyens (82) d'application du bord avant (66) de la plaque de support (62) contre la paroi avant (16) de la fente (14), ces moyens (82) d'application étant distincts du crochet (30).Assembly according to one of the preceding claims, characterized in that it comprises means (82) for applying 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). Ensemble selon la revendication 4, caractérisé en ce que les moyens (82) d'application comprennent au moins un élément d'appui (32) sur le bord avant (66) de la plaque de support (62), l'élément d'appui (32) appartenant au dispositif (26) de fixation et étant distinct de la plaque de support (62). Assembly according to claim 4, characterized in that the application means (82) comprise at least one support element (32) on the front edge (66) of the support plate (62), the element support (32) belonging to the fixing device (26) and being distinct from the support plate (62). Ensemble selon la revendication 5, caractérisé en ce que l'élément d'appui (32) passe, pour venir s'appuyer sur le bord avant (66) de la plaque de support (62), au travers de l'ouverture (80) recevant le crochet (30).Assembly according to claim 5, characterized in that the support element (32) passes, to come to bear on the front edge (66) of the support plate (62), through the opening (80 ) receiving the hook (30). Ensemble selon la revendication 5 ou 6, caractérisé en ce que l'élément d'appui (32) comprend une lame élastique.Assembly according to claim 5 or 6, characterized in that the support element (32) comprises an elastic blade. Ensemble selon la revendication 4, caractérisé en ce que le bord arrière (72) de la plaque de support est lui-même plié au niveau d'un pli intermédiaire (84) délimitant une région d'extrémité (86) dans laquelle l'ouverture (80) de réception du crochet (30) est ménagée, et une région intermédiaire (86) destinée à s'appuyer contre le bord avant (66) de la plaque de support et formant ainsi les moyens (82) d'application.Assembly according to claim 4, characterized in that the rear edge (72) of the support plate is itself folded at an intermediate fold (84) delimiting an end region (86) in which the opening (80) for receiving the hook (30) is provided, and an intermediate region (86) intended to bear against the front edge (66) of the support plate and thus forming the means (82) of application. Ensemble selon l'une des revendications précédentes, caractérisé en ce que la fente (14) a une largeur (l) à proximité de la surface périphérique du cylindre inférieure à 1,5mm.Assembly according to one of the preceding claims, characterized in that the slot (14) has a width ( l ) near the peripheral surface of the cylinder of less than 1.5 mm. Ensemble selon la revendication 9, caractérisé en ce que ladite largeur (l) de la fente est inférieure à 1,1mm.Assembly according to claim 9, characterized in that said width ( l ) of the slot is less than 1.1 mm. Ensemble selon l'une des revendications précédentes, caractérisé en ce que les parois avant (16) et arrière (20) de la fente (14) forment, depuis la surface périphérique du cylindre (2), un angle (α) inférieur à 20°.Assembly according to one of the preceding claims, characterized 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) less than 20 °. Cylindre pour un ensemble selon l'une des revendications précédentes.Cylinder for an assembly according to one of claims preceding. Cylindre selon la revendication 12, caractérisé en ce que le dispositif de fixation (28) comprend au moins un élément (32) d'appui sur le bord avant (66) de la plaque de support (62) pour l'appliquer contre la paroi avant (16) de la fente (14), l'élément d'appui (32) étant distinct du crochet (32).Cylinder according to claim 12, characterized in that the fixing device (28) comprises at least one element (32) bearing on the front edge (66) of the support plate (62) to apply it against the wall front (16) of the slot (14), the support element (32) being separate from the hook (32). Unité de blanchet pour un ensemble selon l'une quelconque des revendications 1 à 10.Blanket unit for a set according to any one of claims 1 to 10. Unité de blanchet selon la revendication 14, caractérisée en ce que le bord arrière (72) de la plaque de support (62) est lui-même plié au niveau d'un pli intermédiaire (84) délimitant une région d'extrémité (86) dans laquelle l'ouverture (80) de réception du crochet (30) est ménagée, et une région intermédiaire (86) destinée à s'appuyer contre le bord avant (66) de la plaque de support pour l'appliquer contre la paroi avant (16) de la fente (14). Blanket unit according to claim 14, characterized in that the rear edge (72) of the support plate (62) is itself folded at an intermediate fold (84) delimiting an end region (86) in which the opening (80) for receiving the hook (30) is made, and an intermediate region (86) intended to bear against the front edge (66) of the support plate to apply it against the front wall (16) of the slot (14). Presse offset, caractérisée en ce qu'elle comprend un ensemble selon l'une des revendications 1 à 11.Offset press, characterized in that it comprises an assembly according to one of claims 1 to 11.
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
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
FR0211620 2002-09-19

Publications (3)

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

Family

ID=31897502

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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

Country Status (7)

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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)

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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

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FR2733719A1 (en) 1995-05-05 1996-11-08 Koenig & Bauer Albert Ag DEVICE FOR FIXING A BLANKET UNIT ON A BLANKET HOLDER CYLINDER
FR2745524A1 (en) 1996-01-19 1997-09-05 Roland Man Druckmasch DEVICE FOR FIXING A COATING MEMBER ON A CYLINDER OF A PRINTING GROUP

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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
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FR2573347A1 (en) 1984-11-16 1986-05-23 Wifag Maschf DEVICE FOR TENSIONING A BLANKET ON A BLANKET CYLINDER OF A ROTARY
FR2733719A1 (en) 1995-05-05 1996-11-08 Koenig & Bauer Albert Ag DEVICE FOR FIXING A BLANKET UNIT ON A BLANKET HOLDER CYLINDER
FR2745524A1 (en) 1996-01-19 1997-09-05 Roland Man Druckmasch DEVICE FOR FIXING A COATING MEMBER ON A CYLINDER OF A PRINTING GROUP

Also Published As

Publication number Publication date
HK1064069A1 (en) 2005-01-21
FR2844743B1 (en) 2004-12-17
DE60306057D1 (en) 2006-07-27
EP1400356A3 (en) 2004-04-28
FR2844743A1 (en) 2004-03-26
EP1400356B1 (en) 2006-06-14
CN1495018A (en) 2004-05-12
CN1307052C (en) 2007-03-28
DE60306057T2 (en) 2007-01-04
US6901857B2 (en) 2005-06-07
JP2004268564A (en) 2004-09-30
JP4703109B2 (en) 2011-06-15
US20040216629A1 (en) 2004-11-04

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