EP0298238B1 - Device for clamping a flexible printing plate onto the forme cylinder of a sheet-fed rotary intaglio printing press - Google Patents

Device for clamping a flexible printing plate onto the forme cylinder of a sheet-fed rotary intaglio printing press Download PDF

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Publication number
EP0298238B1
EP0298238B1 EP88108290A EP88108290A EP0298238B1 EP 0298238 B1 EP0298238 B1 EP 0298238B1 EP 88108290 A EP88108290 A EP 88108290A EP 88108290 A EP88108290 A EP 88108290A EP 0298238 B1 EP0298238 B1 EP 0298238B1
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EP
European Patent Office
Prior art keywords
cylinder
forme cylinder
clamping
printing plate
forme
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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EP88108290A
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German (de)
French (fr)
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EP0298238A2 (en
EP0298238A3 (en
Inventor
Heinrich Ochs
Kurt Difflipp
Lothar Hummel
Jürgen Dipl.-Ing. Ruh
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication date
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Priority to AT88108290T priority Critical patent/ATE74555T1/en
Publication of EP0298238A2 publication Critical patent/EP0298238A2/en
Publication of EP0298238A3 publication Critical patent/EP0298238A3/en
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Publication of EP0298238B1 publication Critical patent/EP0298238B1/en
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    • 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

Definitions

  • the invention relates to a device for clamping a printing plate on the forme cylinder of a sheet-fed rotogravure printing machine according to the preamble of the first claim.
  • a device of this type is known from DE-PS 609 099.
  • the backing of the clamping bar which serves as a base for the clamped pressure plate, does not extend beyond the circumference of the forme cylinder because of a concentric pivoting movement about the forme cylinder axis, so that pressure plates can be clamped smoothly and flat on the forme cylinder when the forme cylinder channel is arranged straight or at an angle to the axis of rotation .
  • the main advantage of the invention is that because of the precise cylindrical rotation of the clamping bar surface, printing plates can be clamped smoothly and flatly on forme cylinders of large-format sheet-fed rotogravure printing presses with high clamping forces.
  • the clamping forces of the same size always act at the printing end of the printing plate across their entire width.
  • the operation of the device is facilitated when pressure medium is actuated in that only a switch has to be operated to switch the compressed air on or off. This reduces makeready times when changing plates on a sheet-fed rotogravure press.
  • a clamping bar 4 is arranged in the cylinder channel 2 of a forme cylinder 1 of a sheet-fed rotogravure printing machine in a known manner.
  • the clamping bar 4 is fastened by means of pins 5 to 8 on the sides in measuring rings 14, 15 of the forme cylinder 1.
  • the measuring rings 14, 15 are loosely pushed onto the two cylinder journals 16, 17 of the forme cylinder 1.
  • One end of a printing plate 3 clamped on the forme cylinder 1 is angled around the forme cylinder edge 10, while the other end of the printing plate 3 with the clamping edge 10 by pivoting the measuring rings 14, 15 against one end by means of an actuating device 18.
  • the measuring rings 14, 15 thus serve at the same time as a measuring basis for measuring cylinder lift thicknesses in a known manner, and also as a drive part according to the invention for tensioning a printing plate 3 on the forme cylinder 1 of a sheet-fed rotogravure printing machine.
  • a pressure medium-operated device is provided as an actuating device 18 for pivoting the measuring rings 14, 15.
  • One cylinder journal 17 of the two cylinder journals 16, 17 is designed so that it accommodates a hydraulic cylinder 20 equipped with an adjustable piston 21, for example as a screw-in cylinder, in a cavity coaxial to the forme cylinder axis 45.
  • This hydraulic cylinder 20 is connected via a distributor system, consisting of a bore 25 running in the direction of the forme cylinder axis 45, two subsequently radial bores 26, 28, two branch screw connections 30, 31 and subsequent two connecting lines 27, 29 with two secondary cylinders 32, 33 .
  • a closable bore 24 is used to fill the hydraulic fluid.
  • Appropriate cutouts 48, 49 are provided in the measuring rings 14, 15 for receiving the branch screw connections 30, 31.
  • One secondary cylinder 32 is arranged in a recess 46 on one end face and the other secondary cylinder 33 in a recess 47 on the other end face within the forme cylinder 1 such that the associated actuating pistons 34, 35 of the secondary cylinders 32, 33 are approximately tangential to the jacket of the forme cylinder 1 to one crank bolt 36, 37 fastened eccentrically to the forme cylinder axis 45 on the measuring rings 14, 15, non-positively.
  • a pneumatic / hydraulic amplifier arrangement is preferably provided on each side of the forme cylinder 1.
  • the device is not limited to this, but can also be replaced by another, e.g. manually operated drive for the adjustable piston 21 of the hydraulic cylinder 20 to be replaced.
  • the pneumatic / hydraulic booster arrangement consists of a pneumatic membrane cylinder 19 connected upstream of the hydraulic cylinder 20, which has a substantially larger pressure area than the hydraulic cylinder 20, so that the clamping forces are generated in an increased ratio of the pressure areas.
  • the pneumatic membrane cylinder 19 is e.g. via a reversing valve, not shown in the drawing, which is actuated by a switch and supplies a rotary transformer 44 with compressed air.
  • At least one projection 52 is provided in the jacket of the forme cylinder 1, which engages like a comb in at least one recess 53 of the clamping bar 4 .
  • the pneumatic / hydraulic actuation of the clamping bar 4, which can be pivoted coaxially to the forme cylinder axis 45 with the measuring rings 14, 15, enables the same and very high clamping forces to be generated at the pressure end of the pressure plate 3 over its entire width.
  • the coaxial mounting of the measuring rings 14, 15 reliably prevents the clamping bar surface from extending beyond the circumference of the forme cylinder 1 during the pivoting movement. This is particularly advantageous when the cylinder channel 2 is arranged obliquely.
  • the hollow lying of the pressure plate 3 can already be avoided during the clamping process.
  • the operation is simplified and the set-up time is reduced when changing plates on a sheet-fed rotogravure printing machine.
  • the operation of the pressure medium operated device is as follows: When the compressed air is switched on with a switch, compressed air is introduced into the pneumatic membrane cylinder 19 via the rotary transducer 44 by opening the reversing valve (not shown in the drawing). The contact pressure is increased in the ratio of the large pressure area of the pneumatic membrane cylinder 19 to the small pressure area of the hydraulic cylinder 20. Against the force of the compression spring 23 the adjustable piston 21 is first moved into the hydraulic cylinder 20. At the same time, the actuating pistons 34, 35 of the secondary cylinders 32, 33 are extended, since the hydraulic fluid is pressed against the actuating pistons 34, 35 via the distributor system 24 to 31.
  • the actuating pistons 34, 35 which are positively connected to the crank pins 36, 37, rotate the measuring rings 14, 15 relative to the forme cylinder 1 coaxially to the forme cylinder axis 45 and thus press the clamping bar 4 with one end (pressure end) of the pressure plate 3 against the other end (start of pressure) .
  • To release the clamping force it is only necessary to operate the switch of the reversing valve in order to switch off the compressed air.
  • the springs in the cylinders 19, 20, 32, 33 and the return springs 38, 39 then automatically spend all adjustable pistons 21 and 34, 35 in the hydraulic cylinders 20, 32, 33 as well as the pistons in the pneumatic diaphragm cylinder 19 and at the same time the measuring rings 14, 15 with the tension bar 4 back to the starting position, as shown in Fig. 1.
  • the pressure medium-operated device can be replaced by a mechanical device, the ease of use of the device being adversely affected by the fact that additional tools and manipulations are required, but the tensioning of the pressure plate 3 is comparable in the circumferential direction with a pressure-operated device.
  • the mechanical device preferably consists of toggle levers mounted in the cylinder channel 2 for pivoting the clamping bar 4 with the coupled measuring rings 14, 15.
  • the toggle lever actuating device is known in principle from DE-PS 3 220 530.
  • the toggle levers are used only for quick bridging of the large clamping path of the clamping bar 4, but not for final clamping in the circumferential direction.
  • the final clamping in the circumferential direction is rather done by at least one clamping screw 54 laterally on each measuring ring 14, 15, which is screw-supported in a threaded nut 55 attached to the measuring ring 14, 15 against a pressure piece 56 on the cylinder journal 16, 17 of the forme cylinder 1, so that the measuring rings 14, 15 are comparable to the pressure-medium-operated device by means of mechanical clamping screws 54 which can be pivoted using a tool after the large clamping path has already been bridged by toggle lever actuation of the clamping bar 4 with simultaneous pivoting of the measuring rings 14, 15.

Abstract

In order to be able to tension an intaglio printing plate, with extremely high tension forces at the trailing edge, uniformly over the entire width of the plate on the plate cylinder of a printing machine, a tension bar (4) is provided which is secured to measuring rings (14, 15) which can be loosely pushed on to the two cylinder journals (16, 17) of the plate cylinder (1) and which can be pivoted by an actuating mechanism (18). <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Aufspannen einer Druckplatte auf dem Formzylinder einer Bogen-Rotationstiefdruckmaschine nach dem Oberbegriff des ersten Patentanspruches.The invention relates to a device for clamping a printing plate on the forme cylinder of a sheet-fed rotogravure printing machine according to the preamble of the first claim.

Eine Vorrichtung dieser Gattung ist aus der DE-PS 609 099 bekannt.
Bei dieser Vorrichtung tritt der als Unterlage für die festgespannte Druckplatte dienende Rücken der Spannleiste wegen einer konzentrischen Schwenkbewegung um die Formzylinderachse nicht über den Umfang des Formzylinders hinaus, so daß Druckplatten bei gerade oder schräg zur Rotationsachse angeordnetem Formzylinderkanal glatt und plan auf dem Formzylinder aufgespannt werden können.A device of this type is known from DE-PS 609 099.
In this device, the backing of the clamping bar, which serves as a base for the clamped pressure plate, does not extend beyond the circumference of the forme cylinder because of a concentric pivoting movement about the forme cylinder axis, so that pressure plates can be clamped smoothly and flat on the forme cylinder when the forme cylinder channel is arranged straight or at an angle to the axis of rotation .

Von Nachteil ist jedoch bei dieser Vorrichtung, daß an der Spannleiste Tragarme angreifen, die auf einer in hohlen Tragzapfen des Formzylinders koaxial gelagerten schwenkbaren Spindel befestigt sind. Da die verschwenkbaren Tragarme jeweils dem Zylinderradius entsprechen, ist der wirksame Hebelarm für die durch erhebliche Kräfte beanspruchte Spannleiste zu groß und die Lagerung zur Spindel zu schwach, so daß diese Anordnung nicht für jede, d.h. nicht für sehr hohe Beanspruchungen und entsprechende Spannkräfte geeignet ist. Insbesondere ist diese Anordnung deshalb für Zylinder mit größerem Umfang ungeeignet, bei denen zum Spannen der Druckplatten in Umfangsrichtung am Druckende sehr hohe Spannkräfte erforderlich sind. Außerdem ist bei dieser Vorrichtung vom Nachteil, daß die Verwendungsmöglichkeit auf ausgekernte Zylinder beschränkt ist. Die Spannleiste muß von Hand betätigt werden und dies erfordert einen hohen Kraftaufwand.The disadvantage of this device, however, is that support arms act on the tensioning bar and are attached to a pivotable spindle which is mounted coaxially in hollow support pins of the forme cylinder. Since the pivotable support arms each correspond to the cylinder radius, the effective lever arm is too large for the clamping bar which is subjected to considerable forces and the bearing for the spindle is too weak, so that this arrangement is not suitable for everyone, ie not for very high loads and corresponding clamping forces. In particular, this arrangement is therefore unsuitable for cylinders with a larger circumference, in which very high clamping forces are required to clamp the printing plates in the circumferential direction at the printing end. Another disadvantage of this device is that the possibility of use is limited to retracted cylinders. The tension bar must be operated by hand and this requires a lot of effort.

Aus verschiedenen Veröffentlichungen, z.B. aus dem DE-GM 6 927 286 und der GB-PS 925 101 ist es bereits bekannt, hydraulische Vorrichtungen zur Betätigung von Spannleisten zum Aufspannen von Druckplatten auf Formzylindern zu verwenden. Bei diesen Vorrichtungen ist jedoch die Spannleiste außerhalb der Zylindermitte gelagert und besitzt deshalb einen kürzeren Schwenkarm. Ferner ist zu bezweifeln, daß mit diesen Vorrichtungen gleiche hohe Spannkräfte an Druckende einer Druckplatte über die ganze Breite zu erzielen sind, weil die Hydraulikflüssigkeit in einem flexiblen Schlauch unmittelbar an der Spannschiene oder dgl. ungleichmäßig angreift.
Aus der DE-PS 3 220 530 ist eine Kniehebel-betätigte Vorrichtung zum Aufspannen von Tiefdruckplatten bekannt.From various publications, for example from DE-GM 6 927 286 and GB-PS 925 101, it is already known to use hydraulic devices for actuating clamping bars for clamping printing plates on forme cylinders. In these devices, however, the clamping bar is mounted outside the cylinder center and therefore has a shorter swivel arm. Furthermore, it is doubtful that these devices can achieve the same high clamping forces across the entire width at the pressure end of a printing plate, because the hydraulic fluid in a flexible hose acts directly on the clamping rail or the like.
From DE-PS 3 220 530 a toggle operated device for clamping gravure plates is known.

Es ist deshalb Aufgabe der Erfindung, eine leicht zu bedienende Vorrichtung zum Aufspannen einer Druckplatte auf den Formzylinder einer Bogen-Rotationstiefdruckmaschine zu schaffen, mit der die Druckplatte am Druckende bei jeder Beanspruchung, d.h. auch mit extrem hohen Spannkräften in Umfangsrichtung, gleichmäßig über die ganze Breite gespannt werden kann.It is therefore an object of the invention to provide an easy-to-use device for mounting a printing plate on the forme cylinder of a sheet-fed rotogravure printing machine, with which the printing plate at the end of the print under any load, i.e. even with extremely high clamping forces in the circumferential direction, can be clamped evenly over the entire width.

Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale des ersten Patentanspruches. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen in Verbindung mit der Zeichnung und der Beschreibung.This object is achieved by the characterizing features of the first claim. Further developments of the invention result from the subclaims in connection with the drawing and the description.

Der wesentliche Vorteil der Erfindung besteht darin, daß wegen der genauen zylindrischen Verdrehung der Spannleistenoberfläche Druckplatten auf Formzylinder von Bogen-Rotationstiefdruckmaschinen großen Umfangs mit hohen Spannkräften glatt und plan aufgespannt werden können. Am Druckende der Druckplatte wirken stets gleichgroße Spannkräfte über deren ganze Breite. Die Bedienung der Vorrichtung ist bei Druckmittelbetätigung dadurch erleichtert, daß lediglich ein Schalter zum An- oder Ausschalten der Druckluft bedient werden muß. Hier verringert sich die Rüstzeit beim Plattenwechsel an einer Bogen-Rotationstiefdruckmaschine.The main advantage of the invention is that because of the precise cylindrical rotation of the clamping bar surface, printing plates can be clamped smoothly and flatly on forme cylinders of large-format sheet-fed rotogravure printing presses with high clamping forces. The clamping forces of the same size always act at the printing end of the printing plate across their entire width. The operation of the device is facilitated when pressure medium is actuated in that only a switch has to be operated to switch the compressed air on or off. This reduces makeready times when changing plates on a sheet-fed rotogravure press.

Die Erfindung soll in einem Ausführungsbeispiel anhand einer Zeichnung nachstehend näher erläutert werden.The invention will be explained in more detail in an exemplary embodiment with reference to a drawing.

Es zeigt:

Fig. 1
eine Draufsicht der Vorrichtung zum Aufspannen einer biegsamen Druckplatte auf dem Formzylinder einer Bogen-Rotationstiefdruckmaschine, in der geöffneten Ausgangslage, in einer ersten Ausführungsvariante,
Fig. 2
einen Schnitt A-A nach Fig. 1, 50° gedreht gezeichnet,
Fig. 3
eine zweite Ausführungsvariante,
Fig. 4
eine teilweise Seitenansicht der zweiten Ausführungsvariante.
It shows:
Fig. 1
1 shows a plan view of the device for clamping a flexible printing plate on the forme cylinder of a sheet-fed rotogravure printing press, in the open starting position, in a first embodiment variant,
Fig. 2
2 shows a section AA according to FIG. 1 rotated 50 °,
Fig. 3
a second variant,
Fig. 4
a partial side view of the second embodiment.

Eine Spannleiste 4 ist im Zylinderkanal 2 eines Formzylinders 1 einer Bogen-Rotationstiefdruckmaschine in bekannter Weise angeordnet. Die Spannleiste 4 wird mittels Stiften 5 bis 8 an den Seiten in Meßringen 14, 15 des Formzylinders 1 befestigt. Die Meßringe 14, 15 sind dabei lose auf die beiden Zylinderzapfen 16, 17 des Formzylinders 1 aufgeschoben. Das eine Ende einer auf den Formzylinder 1 aufgespannten Druckplatte 3 wird abgewinkelt um die Formzylinderkante 10 angelegt, während das andere Ende der Druckplatte 3 mit der Spannkante 10 durch Verschwenken der Meßringe 14, 15 mittels einer Betätigungsvorrichtung 18 gegen das eine Ende andrückbar ist. Die Meßringe 14, 15 dienen somit zugleich als Meßgrundlage zum Messen von Zylinderaufzugsstärken in bekannter Weise, als auch als erfindungsgemäßes Antriebsteil zum Spannen einer Druckplatte 3 auf dem Formzylinder 1 einer Bogen-Rotationstiefdruckmaschine.A clamping bar 4 is arranged in the cylinder channel 2 of a forme cylinder 1 of a sheet-fed rotogravure printing machine in a known manner. The clamping bar 4 is fastened by means of pins 5 to 8 on the sides in measuring rings 14, 15 of the forme cylinder 1. The measuring rings 14, 15 are loosely pushed onto the two cylinder journals 16, 17 of the forme cylinder 1. One end of a printing plate 3 clamped on the forme cylinder 1 is angled around the forme cylinder edge 10, while the other end of the printing plate 3 with the clamping edge 10 by pivoting the measuring rings 14, 15 against one end by means of an actuating device 18. The measuring rings 14, 15 thus serve at the same time as a measuring basis for measuring cylinder lift thicknesses in a known manner, and also as a drive part according to the invention for tensioning a printing plate 3 on the forme cylinder 1 of a sheet-fed rotogravure printing machine.

Gemäß einer ersten in Fig. 1 und Fig. 2 dargestellten Ausführungsvariante, ist eine druckmittelbetätigte Vorrichtung als Betätigungsvorrichtung 18 zum Verschwenken der Meßringe 14, 15 vorgesehen. Der eine Zylinderzapfen 17 der beiden Zylinderzapfen 16, 17 ist so hierzu ausgebildet, daß er in einem Hohlraum koaxial zur Formzylinderachse 45 einen mit einem verstellbaren Kolben 21 ausgerüsteten Hydraulikzylinder 20 z.B. als Einschraubzylinder aufnimmt. Dieser Hydraulikzylinder 20 steht über ein Verteilersystem, bestehend aus einer in Richtung der Formzylinderachse 45 verlaufenden Bohrung 25, zwei anschließend radial verlaufenden Bohrungen 26, 28, zwei Abzweigverschraubungen 30, 31 und sich anschließenden zwei Verbindungsleitungen 27, 29 mit zwei Nebenzylindern 32, 33 in Verbindung. Eine verschließbare Bohrung 24 dient zum Einfüllen der Hydraulikflüssigkeit. Zur Aufnahme der Abzweigverschraubungen 30, 31 sind in den Meßringen 14, 15 entsprechende Aussparungen 48, 49 vorgesehen. Der eine Nebenzylinder 32 ist in einer Aussparung 46 an der einen Stirnseite und der andere Nebenzylinder 33 in einer Aussparung 47 an der anderen Stirnseite innerhalb des Formzylinders 1 so angeordnet, daß die zugehörigen Stellkolben 34, 35 der Nebenzylinder 32, 33 in etwa tangential zum Mantel des Formzylinders 1 an je einen exzentrisch zur Formzylinderachse 45 an den Meßringen 14, 15 befestigten Kurbelbolzen 36, 37 kraftschlüssig sich anlegen können.According to a first embodiment variant shown in FIGS. 1 and 2, a pressure medium-operated device is provided as an actuating device 18 for pivoting the measuring rings 14, 15. One cylinder journal 17 of the two cylinder journals 16, 17 is designed so that it accommodates a hydraulic cylinder 20 equipped with an adjustable piston 21, for example as a screw-in cylinder, in a cavity coaxial to the forme cylinder axis 45. This hydraulic cylinder 20 is connected via a distributor system, consisting of a bore 25 running in the direction of the forme cylinder axis 45, two subsequently radial bores 26, 28, two branch screw connections 30, 31 and subsequent two connecting lines 27, 29 with two secondary cylinders 32, 33 . A closable bore 24 is used to fill the hydraulic fluid. Appropriate cutouts 48, 49 are provided in the measuring rings 14, 15 for receiving the branch screw connections 30, 31. One secondary cylinder 32 is arranged in a recess 46 on one end face and the other secondary cylinder 33 in a recess 47 on the other end face within the forme cylinder 1 such that the associated actuating pistons 34, 35 of the secondary cylinders 32, 33 are approximately tangential to the jacket of the forme cylinder 1 to one crank bolt 36, 37 fastened eccentrically to the forme cylinder axis 45 on the measuring rings 14, 15, non-positively.

Zur Erzeugung der extrem hohen Spannkräfte von z.B. 3000 N pro Meßring, d.h. pro Seite des Formzylinders 1 wird vorzugsweise eine pneumatisch/hydraulische Verstärkeranordnung vorgesehen. Die Vorrichtung ist aber nicht darauf beschränkt, sondern kann auch durch einen anderweitig, z.B. von Hand betätigten Antrieb für den verstellbaren Kolben 21 des Hydraulikzylinders 20 ersetzt werden. Gemäß der Zeichnung besteht die pneumatisch/hydraulische Verstärkeranordnung aus einem dem Hydraulikzylinder 20 vorgeschalteten pneumatischen Membranzylinder 19, der eine wesentlich größere Druckfläche aufweist als der Hydraulikzylinder 20, so daß die Spannkräfte im Verhältnis der Druckflächen verstärkt erzeugt werden. Der pneumatische Membranzylinder 19 wird z.B. über ein in der Zeichnung nicht dargestelltes Umsteuerventil, das mit einem Schalter betätigt wird und einen Drehübertrager 44 mit Druckluft versorgt.To generate the extremely high clamping forces of e.g. 3000 N per measuring ring, i.e. A pneumatic / hydraulic amplifier arrangement is preferably provided on each side of the forme cylinder 1. However, the device is not limited to this, but can also be replaced by another, e.g. manually operated drive for the adjustable piston 21 of the hydraulic cylinder 20 to be replaced. According to the drawing, the pneumatic / hydraulic booster arrangement consists of a pneumatic membrane cylinder 19 connected upstream of the hydraulic cylinder 20, which has a substantially larger pressure area than the hydraulic cylinder 20, so that the clamping forces are generated in an increased ratio of the pressure areas. The pneumatic membrane cylinder 19 is e.g. via a reversing valve, not shown in the drawing, which is actuated by a switch and supplies a rotary transformer 44 with compressed air.

Da alle druckmittelbetätigten Zylinder, d.h. der pneumatische Membranzylinder 19, der Hydraulikzylinder 20 und die hydraulischen Nebenzylinder 32, 33 einseitig beaufschlagte Kolben aufweisen, sind in allen Zylindern 19, 20, 32, 33 Federn vorgesehen und außerdem koaxial eine Druckfeder 23 mit Stützscheibe 22 zwischen dem Membranzylinder 19 und dem Hydraulikzylinder 20 sowie in etwa tangentiale Rückstellfedern 38, 39 in jedem verschwenkbaren Meßring 14, 15. Der Formzylinder 1 weist für die Rückstellfedern 38, 39 entsprechende Aussparungen 50, 51 auf. Die Rückstellfedern 38, 39 werden von Federbolzen 40, 41 bzw. 42, 43 getragen, wobei bei jeweils ein Federbolzen 41 bzw. 42 an den verschwenkbaren Meßringen 14 bzw. 15 und der andere Federbolzen 40 bzw. 43 am Formzylinder 1 befestigt ist.Since all pressure-operated cylinders, i.e. the pneumatic diaphragm cylinder 19, the hydraulic cylinder 20 and the hydraulic secondary cylinders 32, 33 have pistons loaded on one side, springs are provided in all cylinders 19, 20, 32, 33 and also coaxially a compression spring 23 with a support plate 22 between the diaphragm cylinder 19 and the hydraulic cylinder 20 as well as approximately tangential return springs 38, 39 in each pivotable measuring ring 14, 15. The forme cylinder 1 has corresponding cutouts 50, 51 for the return springs 38, 39. The return springs 38, 39 are carried by spring bolts 40, 41 and 42, 43, one spring bolt 41 and 42 being fastened to the pivotable measuring rings 14 and 15 and the other spring bolt 40 and 43 to the forme cylinder 1.

Um die Spannleiste 4 bei der Schwenkbewegung zusätzlich zu führen sowie das glatte Aufliegen der Druckplatte 3 sowohl auf der Spannleistenoberfläche 13 als auch auf der Oberfläche des Formzylinders 1 bei einem sich beim Spannen ausbildenden Spalt hinter der Spannleiste 4 zu erreichen, ist mindestens ein Vorsprung 52 im Mantel des Formzylinders 1 vorgesehen, der kammartig tragend in mindestens eine Aussparung 53 der Spannleiste 4 eingreift.In order to additionally guide the clamping bar 4 during the swiveling movement and the smooth contact of the pressure plate 3 both To reach on the clamping bar surface 13 as well as on the surface of the forme cylinder 1 with a gap that forms during tensioning behind the clamping bar 4, at least one projection 52 is provided in the jacket of the forme cylinder 1, which engages like a comb in at least one recess 53 of the clamping bar 4 .

Durch die pneumatisch/hydraulische Betätigung der mit den Meßringen 14, 15 koaxial zur Formzylinderachse 45 verschwenkbaren Spannleiste 4 lassen sich gleiche und sehr hohe Spannkräfte am Druckende der Druckplatte 3 über deren ganze Breite erzeugen. Zugleich wird durch die koaxiale Lagerung der Meßringe 14, 15 zuverlässig verhindert, daß die Spannleistenoberfläche bei der Schwenkbewegung über den Umfang des Formzylinders 1 hinaustritt. Dies ist besonders von Vorteil bei schräg angeordnetem Zylinderkanal 2.The pneumatic / hydraulic actuation of the clamping bar 4, which can be pivoted coaxially to the forme cylinder axis 45 with the measuring rings 14, 15, enables the same and very high clamping forces to be generated at the pressure end of the pressure plate 3 over its entire width. At the same time, the coaxial mounting of the measuring rings 14, 15 reliably prevents the clamping bar surface from extending beyond the circumference of the forme cylinder 1 during the pivoting movement. This is particularly advantageous when the cylinder channel 2 is arranged obliquely.

In Verbindung mit einer geeigneten Klemmeinrichtung 11, 12 läßt sich das Hohlliegen der Druckplatte 3 bereits beim Klemmvorgang vermeiden. Außerdem tritt bei Druckmittelbetätigung, da keinerlei Werkzeug für den Spannvorgang erforderlich wird, eine Vereinfachung der Bedienung und eine Verringerung der Rüstzeit beim Plattenwechsel an einer Bogen-Rotationstiefdruckmaschine ein.In conjunction with a suitable clamping device 11, 12, the hollow lying of the pressure plate 3 can already be avoided during the clamping process. In addition, when pressure medium is actuated, since no tools are required for the clamping process, the operation is simplified and the set-up time is reduced when changing plates on a sheet-fed rotogravure printing machine.

Die Wirkungsweise der druckmittelbetätigten Vorrichtung ist folgende:
Beim Einschalten der Druckluft mit einem Schalter wird durch Öffnen des in der Zeichnung nicht dargestellten Umsteuerventils Druckluft über den Drehübertrager 44 in den pneumatischen Membranzylinder 19 gegeben. Im Verhältnis der großen Druckfläche des pneumatischen Membranzylinders 19 zur kleinen Druckfläche des Hydraulikzylinders 20 wird der Anpreßdruck verstärkt. Gegen die Kraft der Druckfeder 23 wird der verstellbare Kolben 21 zunächst in den Hydraulikzylinder 20 eingefahren. Zugleich werden die Stellkolben 34, 35 der Nebenzylinder 32, 33 ausgefahren, da die Hydraulikflüssigkeit über das Verteilersystem 24 bis 31 an die Stellkolben 34, 35 gedrückt wird. Die kraftschlüssig an den Kurbelbolzen 36, 37 anliegenden Stellkolben 34, 35 verdrehen die Meßringe 14, 15 relativ zum Formzylinder 1 koaxial zur Formzylinderachse 45 und pressen somit die Spannleiste 4 mit dem einen Ende (Druckende) der Druckplatte 3 gegen das andere Ende (Druckanfang). Zum Aufheben der Spannkraft ist es lediglich erforderlich, den Schalter des Umsteuerventiles zu betätigen, um die Druckluft abzustellen. Die Federn in den Zylindern 19, 20, 32, 33 und die Rückstellfedern 38, 39 verbringen dann selbsttätig alle verstellbaren Kolben 21 bzw. 34, 35 in den hydraulischen Zylindern 20, 32, 33 sowie den Kolben im pneumatischen Membranzylinder 19 und zugleich die Meßringe 14, 15 mit der Spannleiste 4 in die Ausgangslage zurück, wie sie in Fig. 1 dargestellt ist.The operation of the pressure medium operated device is as follows:
When the compressed air is switched on with a switch, compressed air is introduced into the pneumatic membrane cylinder 19 via the rotary transducer 44 by opening the reversing valve (not shown in the drawing). The contact pressure is increased in the ratio of the large pressure area of the pneumatic membrane cylinder 19 to the small pressure area of the hydraulic cylinder 20. Against the force of the compression spring 23 the adjustable piston 21 is first moved into the hydraulic cylinder 20. At the same time, the actuating pistons 34, 35 of the secondary cylinders 32, 33 are extended, since the hydraulic fluid is pressed against the actuating pistons 34, 35 via the distributor system 24 to 31. The actuating pistons 34, 35, which are positively connected to the crank pins 36, 37, rotate the measuring rings 14, 15 relative to the forme cylinder 1 coaxially to the forme cylinder axis 45 and thus press the clamping bar 4 with one end (pressure end) of the pressure plate 3 against the other end (start of pressure) . To release the clamping force, it is only necessary to operate the switch of the reversing valve in order to switch off the compressed air. The springs in the cylinders 19, 20, 32, 33 and the return springs 38, 39 then automatically spend all adjustable pistons 21 and 34, 35 in the hydraulic cylinders 20, 32, 33 as well as the pistons in the pneumatic diaphragm cylinder 19 and at the same time the measuring rings 14, 15 with the tension bar 4 back to the starting position, as shown in Fig. 1.

Gemäß einer in der Zeichnung in Fig. 3 und Fig. 4 dargestellten Ausführungsform kann die druckmittelbetätigte Vorrichtung durch eine mechanische Vorrichtung ersetzt werden, wobei die Bedienungsfreundlichkeit der Vorrichtung zwar dadurch beeinträchtigt wird, daß zusätzliche Werkzeuge und Handhabungen erforderlich werden, aber das Spannen der Druckplatte 3 in Umfangsrichtung mit einer druckmittelbetätigten Vorrichtung vergleichbar ist.According to an embodiment shown in the drawing in FIGS. 3 and 4, the pressure medium-operated device can be replaced by a mechanical device, the ease of use of the device being adversely affected by the fact that additional tools and manipulations are required, but the tensioning of the pressure plate 3 is comparable in the circumferential direction with a pressure-operated device.

Vorzugsweise besteht die mechanische Vorrichtung aus im Zylinderkanal 2 gelagerten Kniehebeln zum Verschwenken der Spannleiste 4 mit den angekoppelten Meßringen 14, 15. Die Kniehebel-Betätigungsvorrichtung ist aus der DE-PS 3 220 530 prinzipiell bekannt. Im Zusammenhang mit dem vorliegenden Erfindungsgegenstand dienen die Kniehebel lediglich zum schnellen Überbrücken des großen Spannweges der Spannleiste 4, nicht aber zum endgültigen Spannen in Umfangsrichtung.The mechanical device preferably consists of toggle levers mounted in the cylinder channel 2 for pivoting the clamping bar 4 with the coupled measuring rings 14, 15. The toggle lever actuating device is known in principle from DE-PS 3 220 530. In connection with the present subject matter of the invention, the toggle levers are used only for quick bridging of the large clamping path of the clamping bar 4, but not for final clamping in the circumferential direction.

Das endgültige Spannen in Umfangsrichtung erfolgt vielmehr durch mindestens je eine Spannschraube 54 seitlich an jedem Meßring 14, 15, die in einer am Meßring 14, 15 befestigten Gewindemutter 55 verschraubbar gegen ein Druckstück 56 am Zylinderzapfen 16, 17 des Formzylinders 1 abgestützt ist, so daß die Meßringe 14, 15 vergleichbar mit der druckmittelbetätigten Vorrichtung durch mechanische Spannschrauben 54 mittels Werkzeug verschwenkbar sind, nachdem zuvor der große Spannweg durch Kniehebelbetätigung der Spannleiste 4 mit gleichzeitigem Verschwenken der Meßringe 14, 15 bereits überbrückt worden ist.The final clamping in the circumferential direction is rather done by at least one clamping screw 54 laterally on each measuring ring 14, 15, which is screw-supported in a threaded nut 55 attached to the measuring ring 14, 15 against a pressure piece 56 on the cylinder journal 16, 17 of the forme cylinder 1, so that the measuring rings 14, 15 are comparable to the pressure-medium-operated device by means of mechanical clamping screws 54 which can be pivoted using a tool after the large clamping path has already been bridged by toggle lever actuation of the clamping bar 4 with simultaneous pivoting of the measuring rings 14, 15.

BezugszeichenlisteReference symbol list

11
FormzylinderForme cylinder
22nd
ZylinderkanalCylinder channel
33rd
Druckplatteprinting plate
44th
SpannleisteTensioning bar
55
Stiftpen
66
Stiftpen
77
Stiftpen
88th
Stiftpen
99
SpannschienenkanteTensioning rail edge
1010th
FormzylinderkanteForm cylinder edge
1111
KlemmschieneClamping rail
1212
KlemmschieneClamping rail
1313
SpannleistenoberflächeTensioning bar surface
1414
MeßringMeasuring ring
1515
MeßringMeasuring ring
1616
ZylinderzapfenCylinder journal
1717th
abgesetzte Zylinderzapfenstepped cylinder lugs
1818th
BetätigungsvorrichtungActuator
1919th
pneumatischer Membranzylinderpneumatic diaphragm cylinder
2020th
HydraulikzylinderHydraulic cylinder
2121
verstellbarer Kolbenadjustable piston
2222
Scheibedisc
2323
DruckfederCompression spring
2424th
Bohrungdrilling
2525th
Bohrungdrilling
2626
Bohrungdrilling
2727th
VerbindungsleitungConnecting line
2828
Bohrungdrilling
2929
VerbindungsleitungConnecting line
3030th
AbzweigverschraubungBranch screw connection
3131
AbzweigverschraubungBranch screw connection
3232
NebenzylinderSecondary cylinder
3333
NebenzylinderSecondary cylinder
3434
StellkolbenAdjusting piston
3535
StellkolbenAdjusting piston
3636
KurbelbolzenCrank pin
3737
KurbelbolzenCrank pin
3838
RückstellfederReturn spring
3939
RückstellfederReturn spring
4040
FederbolzenSpring bolt
4141
FederbolzenSpring bolt
4242
FederbolzenSpring bolt
4343
FederbolzenSpring bolt
4444
DrehübertragerRotary transformer
4545
FormzylinderachseForme cylinder axis
4646
Aussparung für NebenzylinderRecess for secondary cylinders
4747
Aussparung für NebenzylinderRecess for secondary cylinders
4848
Aussparung für AbzweigverschraubungCut-out for branch screw connection
4949
Aussparung für AbzweigverschraubungCut-out for branch screw connection
5050
Aussparung für RückstellfederRecess spring recess
5151
Aussparung für RückstellfederRecess spring recess
5252
Vorsprunghead Start
5353
AussparungRecess
5454
SpannschraubeClamping screw
5555
GewindemutterThreaded nut
5656
DruckstückPressure piece

Claims (6)

  1. Device for tensioning a flexible printing plate (3) on the forme cylinder (1) of a sheet fed rotary intaglio printing press in which the one end of the printing plate (3) can be laid bent away about the edge (10) of the forme cylinder channel (2) and the other end of the printing plate (3) can be pressed against the one end of the printing plate (3) by means of a tensioning bar (4) which is swingably mounted coaxially relative to the forme cylinder axis (45), characterised in that the tensioning bar (4) is mounted on measuring rings (14, 15) which are loosely placed over both cylinder journals (16, 17) of the forme cylinder (1) and that the measuring rings (14, 15) can be swung via an actuation device (18).
  2. Device according to Claim 2, characterised in that as actuation device (18) a pressure medium actuated device is provided which has a hydraulic cylinder provided with an adjustable piston (21) in a hollow space of one of the cylinder channels (17) which is connected via a distributor system (24 to 31) with slave cylinders (32, 33) which are arranged in recesses (46, 47) at the end faces of the forme cylinder (1) and that in the slave cylinders (32, 33) there is provided in each case an adjusting piston (34, 35) which lies force positively against a crank bolt (36, 37) mounted in the measuring rings (14, 15) eccentrically relative to the forme cylinder axis (45).
  3. Device according to Claim 1 and 2, characterised in that a pneumatic membrane cylinder (19) is connected prior to the hydraulic cylinder (20) which is connected via a rotary coupling (44) and feed conduit with a cutoff valve of a source of compressed air.
  4. Device according to Claims 1 to 3, characterised in that arranged relative to each measuring ring (14, 15) are return springs (38, 39), the ends of which are fixed in each case to a spring pin (40, 41) or (42, 43) and that in each case a spring bolt (41, 42) is fixed to the swingable measuring rings (14; 15) and the other spring bolts (40, 43) on the forme cylinder (1).
  5. Device according to Claim 1, characterised in that as actuation device (18), a mechanical device is provided which has an over centre lever mounted in the cylinder channel (2) and that for final tensioning a tensioning bolt (54) is screwable in a threaded nut (55) fixed laterally to the measuring rings (14, 15) supported against a pressure piece (56) on the cylinder journal (16, 17) of the forme cylinder (1).
  6. Device according to Claims 1 to 5, characterised in that at least one projection (52) in the cover of the forme cylinder (1) is arranged engaging in comb-like fashion in at least one recess (53) of the tensioning bar (4).
EP88108290A 1987-07-04 1988-05-25 Device for clamping a flexible printing plate onto the forme cylinder of a sheet-fed rotary intaglio printing press Expired - Lifetime EP0298238B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88108290T ATE74555T1 (en) 1987-07-04 1988-05-25 DEVICE FOR CLAMPING A FLEXIBLE PRINTING PLATE ON THE FORMING CYLINDER OF A SHEET ROTARY GRAVIFICATION PRESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3722174 1987-07-04
DE19873722174 DE3722174A1 (en) 1987-07-04 1987-07-04 DEVICE FOR CLAMPING A FLEXIBLE PRINT PLATE ON THE FORM CYLINDER OF A BOW ROTATION PRINTING MACHINE

Publications (3)

Publication Number Publication Date
EP0298238A2 EP0298238A2 (en) 1989-01-11
EP0298238A3 EP0298238A3 (en) 1990-04-04
EP0298238B1 true EP0298238B1 (en) 1992-04-08

Family

ID=6330930

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88108290A Expired - Lifetime EP0298238B1 (en) 1987-07-04 1988-05-25 Device for clamping a flexible printing plate onto the forme cylinder of a sheet-fed rotary intaglio printing press

Country Status (3)

Country Link
EP (1) EP0298238B1 (en)
AT (1) ATE74555T1 (en)
DE (2) DE3722174A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5094165A (en) * 1989-08-04 1992-03-10 Komori Corporation Plate lockup apparatus for sheet-fed press
DE3943119C1 (en) * 1989-12-27 1991-06-20 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
DE4210009C2 (en) * 1992-03-27 1994-05-11 Heidelberger Druckmasch Ag Rotary union

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE387696C (en) * 1924-01-02 Albert & Cie Akt Ges Device for attaching lifts for cylinders to printing machines
DE388929C (en) * 1922-12-10 1924-01-29 Georg Germann Plate cylinder for gravure printing machines with a core of replaceable holding blocks for clamping the printing plates
DE609099C (en) * 1930-03-10 1935-02-07 Angelo Dagnino Fixing and clamping device for flexible printing plates on the forme cylinder of rotogravure printing machines
GB925101A (en) * 1959-05-22 1963-05-01 Carl Allers Ets Improvements in or relating to printing machine cylinders
DE1125948B (en) * 1959-09-05 1962-03-22 Maschf Augsburg Nuernberg Ag Device for clamping flexible printing plates
DE1172690B (en) * 1961-06-14 1964-06-25 Maschf Augsburg Nuernberg Ag Device for clamping flexible printing plates on the forme cylinder of rotary printing machines
DE1246764B (en) * 1964-10-26 1967-08-10 Winkler Maschf Clamping device for flexible printing plates
FR1568127A (en) * 1968-02-14 1969-05-23
DE6930610U (en) * 1968-08-01 1973-09-13 Nebiolo Spa CYLINDERS FOR FIXED BLADE-SHAPED PARTS, IN PARTICULAR FORM CYLINDERS OF ROTARY PRINTING MACHINES FOR CARRYING FLEXIBLE PRINT FORMS.
DE6927286U (en) * 1969-07-04 1969-11-13 Koenig & Bauer Schnellpressfab DEVICE FOR FIXING FLEXIBLE PRINTING PLATES ON CYLINDERS OF ROTARY PRINTING MACHINES
DE3220530C2 (en) * 1982-06-01 1985-02-21 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Device for clamping intaglio printing plates
DE3300678A1 (en) * 1983-01-11 1984-07-19 Frankenthal Ag Albert CYLINDERS FOR PRINTING MACHINES

Also Published As

Publication number Publication date
DE3869845D1 (en) 1992-05-14
EP0298238A2 (en) 1989-01-11
EP0298238A3 (en) 1990-04-04
DE3722174A1 (en) 1989-01-12
DE3722174C2 (en) 1990-08-16
ATE74555T1 (en) 1992-04-15

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