EP0246977B1 - Flexible printing plate fixed to a support cylinder in a rotary printing machine - Google Patents
Flexible printing plate fixed to a support cylinder in a rotary printing machine Download PDFInfo
- Publication number
- EP0246977B1 EP0246977B1 EP87401147A EP87401147A EP0246977B1 EP 0246977 B1 EP0246977 B1 EP 0246977B1 EP 87401147 A EP87401147 A EP 87401147A EP 87401147 A EP87401147 A EP 87401147A EP 0246977 B1 EP0246977 B1 EP 0246977B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- wing
- support cylinder
- cylinder
- printing plate
- 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
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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
- B41F27/1281—Devices for attaching printing elements or formes to supports for attaching flexible printing formes details of the printing plate ends
Definitions
- the present invention relates to a plate plate intended to be mounted and immobilized on a support cylinder of a rotary printer.
- Rotary offset printing presses use plate cylinders on which plate plates are fixed which are wound around the lateral surface of the support cylinder.
- For fixing the plate plates it is customary to use devices for fixing the two ends of the plate which are engaged in a longitudinal slot provided in the peripheral surface of the support cylinder.
- cylinders are already known having four diametrically opposite slots inclined with respect to the radial axes for fixing plates by wedging the two end wings of the plate in one inclined slots (see CH - 518 176).
- a plate cylinder having a slot arranged radially with respect to the cylinder but, in this case, the ends of the plate plate although folded to enter the slot are maintained in these by elastically annexed members subjected to a rotary blocking and unblocking element.
- Most of these solutions make it possible to exert traction on the printing plate in order to give it sufficient tension to keep it firmly applied against the support cylinder during a printing operation, but these arrangements are complicated to perform, little safe and expensive.
- the present invention aims to remedy these drawbacks by providing a plate-plate of a particularly simple, easy and inexpensive design to manufacture and maintaining itself in position on the peripheral surface of a support cylinder, without having to do use of auxiliary fasteners.
- this plate plate intended to be mounted and immobilized on a support cylinder of a rotary printer which has, in its lateral surface, a longitudinal slot in which are engaged and maintained the end portions of the plate plate folded towards the axis of the cylinder, is characterized in that it has, in the rest state in which it extends flat, a first wing folded back on one side of the plate, at a first longitudinal end of that -this, by forming with the rest of the plate a first angle substantially equal to 90 ° and, at its second longitudinal end, a second wing folded back on the same side of the plate-plate as the first, by forming a second acute angle with the plane of the plate to which it is connected, these first and second angles being chosen so as to be less than the obtuse and acute angles of the respective dihedrons which are delimited in the support cylinder, on either side of the slot which is inclined relative to the radial direction.
- the two wings folded at the two longitudinal ends of the plate plate are engaged in the longitudinal slot provided in the support cylinder and they ensure d 'themselves, because of their elastic deformations which result from this engagement, the maintenance in place of the plate-plate on its support cylinder, and this with a satisfactory tension for this plate-plate.
- the invention also relates to a plate cylinder for a rotary printing press comprising, in its lateral surface, a longitudinal slot for fixing the ends of a plate, characterized in that the longitudinal slot is inclined relative to the radial direction to define, on either side of the slot, respective obtuse and acute angle dihedrons greater than the respective angles whose wings are folded at the longitudinal ends of the plate, on the same side of that -this.
- the plate plate which is shown in Figure 1 is made of an elastic metallic material and it is, at the start, in the form of a rectangular blank.
- This plate-plate includes a rectangular main surface 1, constituting the engraved active part of the plate.
- This planar engraved active part 1 is extended, at a first end, by a first wing 2 which is folded substantially at right angles, on one side of the plate, that is to say by forming an angle a equal to ( or close to) 90 °.
- the plate has a second wing 3 folded back on the same side as the first wing 2.
- This wing 3 comprises two sections, namely a first section 3a forming an acute angle b with the plane of the engraved active part 1, in extending in the direction of the first wing 2, and a second section 3b extending the first section 3a outward and substantially perpendicular to the plane of the plane etched part 1.
- the two wings 2 and 3 are obtained by bending a initially completely flat plate, as shown in phantom in Figure 1.
- the distance d between the fold line 4, between the first wing 2 and the planar engraved part 1 and the fold line 5 between the second wing 3 and the planar engraved part 1 is slightly less than the developed length of the lateral surface of the support cylinder on which the plate must be mounted and immobilized.
- This support cylinder is indicated by the reference 6 in Figures 2 and 3.
- This cylinder has, in the usual way, a longitudinal slot 7 in which must engage the folded end portions of the plate plate.
- This slot 7 extends in a direction which is inclined at a small angle relative to the radial direction 8 of the support cylinder and which forms an angle c with the plane P tangent to the cylinder at the point where the slot 7 opens.
- This slot 7 thus delimits in the cylinder two opposite portions, namely a left portion forming a dihedral A of obtuse angle and a right portion forming a dihedron B of acute angle c.
- the plate according to the invention is held on the support cylinder 6 as a result of the only elastic deformation of its wings 2 and 3.
- the second wing 3 of the plate plate is subjected to a bending stress causing an increase in the angle b, when it is engaged in the foreground in the longitudinal slot 7 , due to the fact that it comes to cap the right dihedral B with an acute angle C greater than the original angle b of the wing 3.
- the second wing 3 is resiliently biased in the direction of closing.
- the first wing 2 of the plate plate which then comes to cap the left dihedral A obtuse angle, being forced to open slightly.
- the angle a which it forms with the etched part 1 of the plate becomes greater than 90 ° and it is thus subjected to a bending stress in the direction of opening.
- the first wing 2, engaged in the slot 7, is thus taken and clamped between the wall of the slot 7 and the second wing 3 forming a spring as seen in FIG. 3.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Printing Plates And Materials Therefor (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
Abstract
Description
La présente invention concerne une plaque-cliché destinée à être montée et immobilisée sur un cylindre support d'une imprimeuse rotative.The present invention relates to a plate plate intended to be mounted and immobilized on a support cylinder of a rotary printer.
Les imprimeuses rotatives du type offset utilisent des cylindres porte-cliché sur lesquels sont fixées des plaques-clichés qui sont enroulées autour de la surface latérale du cylindre support. Pour la fixation des plaques-clichés on utilise habituellement des dispositifs de fixation des deux extrémités de la plaque qui sont engagées dans une fente longitudinale prévue dans la surface périphérique du cylindre support.Rotary offset printing presses use plate cylinders on which plate plates are fixed which are wound around the lateral surface of the support cylinder. For fixing the plate plates, it is customary to use devices for fixing the two ends of the plate which are engaged in a longitudinal slot provided in the peripheral surface of the support cylinder.
Dans les dispositifs connus de fixation d'une plaque-cliché sur un cylindre support, on connaît déjà des cylindres comportant quatre fentes diamétralement opposées inclinées par rapport aux axes radiaux pour la fixation de clichés par coincement des deux ailes terminales du cliché dans l'une des fentes inclinées (voir CH - 518 176). On connaît également par le US - A - 4 214 530, un cylindre porte-cliché présentant une fente disposée radialement par rapport au cylindre mais, dans ce cas, les extrémités de la plaque-cliché bien que repliées pour pénétrer dans la fente sont maintenues dans celles-ci par des organes annexes élastiquement soumis à un élément rotatif de blocage et de déblocage. La plupart de ces solutions permettent d'exercer une traction sur la plaque-cliché afin de donner à celle-ci une tension suffisante pour la maintenir fermement appliquée contre le cylindre support pendant une opération d'impression mais ces dispositions sont compliquées à réaliser, peu sûres et onéreuses.In known devices for fixing a plate on a support cylinder, cylinders are already known having four diametrically opposite slots inclined with respect to the radial axes for fixing plates by wedging the two end wings of the plate in one inclined slots (see CH - 518 176). Also known from US-A-4,214,530 is a plate cylinder having a slot arranged radially with respect to the cylinder but, in this case, the ends of the plate plate although folded to enter the slot are maintained in these by elastically annexed members subjected to a rotary blocking and unblocking element. Most of these solutions make it possible to exert traction on the printing plate in order to give it sufficient tension to keep it firmly applied against the support cylinder during a printing operation, but these arrangements are complicated to perform, little safe and expensive.
La présente invention vise à remédier à ces inconvénients en procurant une plaque-cliché de conception particulièrement simple, facile et bon marché à fabriquer et se maintenant d'elle-même en position sur la surface périphérique d'un cylindre support, sans avoir à faire appel à des organes de fixation auxiliaires.The present invention aims to remedy these drawbacks by providing a plate-plate of a particularly simple, easy and inexpensive design to manufacture and maintaining itself in position on the peripheral surface of a support cylinder, without having to do use of auxiliary fasteners.
A cet effet, cette plaque-cliché destinée à être montée et immobilisée sur un cylindre support d'une imprimeuse rotative, lequel présente, dans sa surface latérale, une fente longitudinale dans laquelle sont engagées et maintenues les parties extrêmes de la plaque-cliché repliées vers l'axe du cylindre, est caractérisée en ce qu'elle présente, à l'état de repos dans laquelle elle s'étend à plat, une première aile repliée d'un côté de la plaque, à une première extrémité longitudinale de celle-ci, en formant avec le reste de la plaque un premier angle sensiblement égal à 90° et, à sa seconde extrémité longitudinale, une seconde aile repliée du même côté de la plaque-cliché que la première, en formant un second angle aigu avec le plan de la plaque à laquelle elle est raccordée, ces premier et second angles étant choisis de manière à être inférieurs aux angles obtus et aigu des dièdres respectifs qui sont délimités dans le cylindre support, de part et d'autre de la fente qui est inclinée par rapport à la direction radiale.To this end, this plate plate intended to be mounted and immobilized on a support cylinder of a rotary printer, which has, in its lateral surface, a longitudinal slot in which are engaged and maintained the end portions of the plate plate folded towards the axis of the cylinder, is characterized in that it has, in the rest state in which it extends flat, a first wing folded back on one side of the plate, at a first longitudinal end of that -this, by forming with the rest of the plate a first angle substantially equal to 90 ° and, at its second longitudinal end, a second wing folded back on the same side of the plate-plate as the first, by forming a second acute angle with the plane of the plate to which it is connected, these first and second angles being chosen so as to be less than the obtuse and acute angles of the respective dihedrons which are delimited in the support cylinder, on either side of the slot which is inclined relative to the radial direction.
Lors du montage de la plaque-cliché suivant l'invention sur le cylindre support d'une imprimeuse rotative, les deux ailes repliées aux deux extrémités longitudinales de la plaque-cliché sont engagées dans la fente longitudinale prévue dans le cylindre support et elles assurent d'elles- mêmes, du fait de leurs déformations élastiques qui résultent de cet engagement, le maintien en place de la plaque-cliché sur son cylindre support, et ce avec une tension satisfaisante pour cette plaque-cliché.When mounting the plate plate according to the invention on the support cylinder of a rotary printer, the two wings folded at the two longitudinal ends of the plate plate are engaged in the longitudinal slot provided in the support cylinder and they ensure d 'themselves, because of their elastic deformations which result from this engagement, the maintenance in place of the plate-plate on its support cylinder, and this with a satisfactory tension for this plate-plate.
L'invention a également pour objet un cylindre porte-cliché pour une imprimeuse rotative comportant, dans sa surface latérale, une fente longitudinale pour la fixation des extrémités d'une plaque-cliché, caractérisé en ce que la fente longitudinale est inclinée par rapport à la direction radiale pour définir, de part et d'autre de la fente, des dièdres d'angle respectifs obtus et aigu supérieurs aux angles respectifs dont des ailes sont repliées aux extrémités longitudinales de la plaque-cliché, d'un même côté de celle-ci.The invention also relates to a plate cylinder for a rotary printing press comprising, in its lateral surface, a longitudinal slot for fixing the ends of a plate, characterized in that the longitudinal slot is inclined relative to the radial direction to define, on either side of the slot, respective obtuse and acute angle dihedrons greater than the respective angles whose wings are folded at the longitudinal ends of the plate, on the same side of that -this.
On décrira ci-après, à titre d'exemple non limitatif, une forme d'exécution de la présente invention, en référence au dessin annexé sur lequel:
- La figure 1 est une vue en coupe longitudinale d'une plaque-cliché développée à plat à l'état de repos, suivant l'invention.
- La figure 2 est une vue en coupe transversale partielle d'un cylindre support et d'une plaque-cliché suivant l'invention, au cours du montage de cette plaque-cliché.
- La figure 3 est une vue en coupe transversale partielle d'une plaque-cliché montée et immobilisée sur son cylindre support.
- Figure 1 is a longitudinal sectional view of a plate developed flat in the rest state, according to the invention.
- Figure 2 is a partial cross-sectional view of a support cylinder and a plate-plate according to the invention, during the mounting of this plate-plate.
- Figure 3 is a partial cross-sectional view of a plate plate mounted and immobilized on its support cylinder.
La plaque-cliché qui est représentée sur la figure 1, est réalisée en un matériau métallique élastique et elle se présente, au départ, sous la forme d'un flan rectangulaire. Cette plaque-cliché comprend une surface principale rectangulaire 1, constituant la partie active gravée de la plaque. Cette partie active gravée plane 1 est prolongée, à une première extrémité, par une première aile 2 qui est repliée sensiblement à l'équerre, d'un côté de la plaque c'est-à-dire en formant un angle a égale à (ou voisin de) 90°. A son autre extrémité, la plaque présente une seconde aile 3 repliée du même côté que la première aile 2. Cette aile 3 comprend deux sections à savoir une première section 3a formant un angle aigu b avec le Plan de la partie active gravée 1, en s'étendant en direction de la première aile 2, et une seconde section 3b prolongeant la première section 3a vers l'extérieur et sensiblement perpendiculaire au plan de la partie gravée plane 1. Les deux ailes 2 et 3 sont obtenues par cambrage d'une plaque initialement totalement plane, ainsi qu'il est représenté en trait mixte sur la figure 1.The plate plate which is shown in Figure 1, is made of an elastic metallic material and it is, at the start, in the form of a rectangular blank. This plate-plate includes a rectangular main surface 1, constituting the engraved active part of the plate. This planar engraved active part 1 is extended, at a first end, by a
La distance d entre la ligne de pliage 4, entre la première aile 2 et la partie gravée plane 1 et la ligne de pliage 5 entre la seconde aile 3 et la partie gravée plane 1 est légèrement inférieure à la longueur développée de la surface latérale du cylindre support sur lequel doit être montée et immobilisée la plaque-cliché.The distance d between the fold line 4, between the
Ce cylindre support est indiqué par la référence 6 sur les figures 2 et 3. Ce cylindre présente, de la manière habituelle, une fente longitudinale 7 dans laquelle doivent s'engager les parties extrêmes repliées de la plaque-cliché. Cette fente 7 s'étend suivant une direction qui est inclinée d'un petit angle par rapport à la direction radiale 8 du cylindre support et qui forme un angle c avec la plan P tangent au cylindre à l'endroit où débouche la fente 7. Cette fente 7 délimite ainsi dans le cylindre deux portions en regard à savoir une portion gauche formant un dièdre A d'angle obtus et une portion droite formant un dièdre B d'angle aigu c.This support cylinder is indicated by the reference 6 in Figures 2 and 3. This cylinder has, in the usual way, a
Comme on peut le voir sur les figures 2 et 3, la plaque-cliché suivant l'invention est maintenue sur le cylindre support 6 par suite de la seule déformation élastique de ses ailes 2 et 3. En effet, du fait de l'inclinaison de la fente 7 par rapport à la direction radiale 8, la seconde aile 3 de la plaque-cliché est soumise à une contrainte de flexion entraînant une augmentation de l'angle b, lorsqu'elle est engagée en premier plan dans la fente longitudinale 7, du fait qu'elle vient coiffer le dièdre droit B d'angle aigu C supérieur à l'angle d'origine b de l'aile 3. De ce fait la seconde aile 3 est sollicitée élastiquement dans le sens de la fermeture. On introduit ensuite, dans la fente 7, la première aile 2 de la plaque-cliché qui vient alors coiffer le dièdre gauche A d'angle obtus, en étant forcée de s'ouvrir légèrement. Autrement dit, l'angle a qu'elle forme avec la partie gravée 1 de la plaque devient supérieur à 90° et elle est ainsi soumise à une contrainte de flexion dans le sens de l'ouverture. La première aile 2, engagée dans la fente 7, se trouve ainsi prise et serrée entre la paroi de la fente 7 et la seconde aile 3 formant ressort comme on le voit sur la figure 3.As can be seen in Figures 2 and 3, the plate according to the invention is held on the support cylinder 6 as a result of the only elastic deformation of its
Les déformations élastiques des deux ailes 2 et 3 et les pressions qui en résultent, sont suffisantes pour assurer le maintien ferme de la plaque-cliché pendant la rotation de son cylindre support 6.The elastic deformations of the two
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87401147T ATE55325T1 (en) | 1986-05-22 | 1987-05-21 | FLEXIBLE PRINT PLATE MOUNTED ON A CARRIER CYLINDER IN A ROTARY PRESS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8607313 | 1986-05-22 | ||
| FR8607313A FR2598973B1 (en) | 1986-05-22 | 1986-05-22 | PLATE PLATE INTENDED TO BE MOUNTED AND IMMOBILIZED ON A CYLINDER SUPPORTING A ROTARY PRINTER AND CYLINDER PLATE HOLDER FOR FIXING A PLATE PLATE. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0246977A1 EP0246977A1 (en) | 1987-11-25 |
| EP0246977B1 true EP0246977B1 (en) | 1990-08-08 |
Family
ID=9335496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87401147A Expired - Lifetime EP0246977B1 (en) | 1986-05-22 | 1987-05-21 | Flexible printing plate fixed to a support cylinder in a rotary printing machine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0246977B1 (en) |
| AT (1) | ATE55325T1 (en) |
| DE (1) | DE3764175D1 (en) |
| FR (1) | FR2598973B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10218475B4 (en) * | 2002-04-25 | 2006-06-29 | Koenig & Bauer Ag | Cylinder of a rotary printing machine with a lift |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH682382A5 (en) * | 1990-04-25 | 1993-09-15 | Bobst Sa | A method of mounting and fixing a printing plate on the plate cylinder of a printing machine. |
| DE4241588C2 (en) * | 1992-12-10 | 1994-11-17 | Roland Man Druckmasch | Page register system for printing forms |
| WO1997038859A1 (en) * | 1996-04-15 | 1997-10-23 | Imation Corp. | Printing plate having a crimped end portion and method for making the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB690946A (en) * | 1950-08-14 | 1953-04-29 | Block & Anderson Ltd | Improvements in or relating to spirit duplicating machines |
| CH518176A (en) * | 1969-11-18 | 1972-01-31 | Linotype Machinery Ltd | Cylinder for rotary printing press |
| GB1486873A (en) * | 1974-08-06 | 1977-09-28 | Koenig & Bauer Ag | Printing press cylinder with means of securing a mounting block for a printing plate or blanket clamping device |
| US4214530A (en) * | 1978-02-23 | 1980-07-29 | Glanzner Gary C | Metal printing plate |
-
1986
- 1986-05-22 FR FR8607313A patent/FR2598973B1/en not_active Expired - Fee Related
-
1987
- 1987-05-21 EP EP87401147A patent/EP0246977B1/en not_active Expired - Lifetime
- 1987-05-21 AT AT87401147T patent/ATE55325T1/en not_active IP Right Cessation
- 1987-05-21 DE DE8787401147T patent/DE3764175D1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10218475B4 (en) * | 2002-04-25 | 2006-06-29 | Koenig & Bauer Ag | Cylinder of a rotary printing machine with a lift |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3764175D1 (en) | 1990-09-13 |
| EP0246977A1 (en) | 1987-11-25 |
| FR2598973B1 (en) | 1991-02-08 |
| ATE55325T1 (en) | 1990-08-15 |
| FR2598973A1 (en) | 1987-11-27 |
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