EP0875378B2 - Clamping device - Google Patents
Clamping device Download PDFInfo
- Publication number
- EP0875378B2 EP0875378B2 EP98106692A EP98106692A EP0875378B2 EP 0875378 B2 EP0875378 B2 EP 0875378B2 EP 98106692 A EP98106692 A EP 98106692A EP 98106692 A EP98106692 A EP 98106692A EP 0875378 B2 EP0875378 B2 EP 0875378B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- printing
- forme
- clamping device
- clamping
- 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
Links
- 238000007639 printing Methods 0.000 claims description 57
- 238000000034 method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
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
- B41F27/1231—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 translatory motion substantially tangential to support surface
Definitions
- the invention relates to a clamping device for printing forms to be fastened on a forme cylinder of printing presses according to the preamble of claim 1.
- the printing plates designed as printing plates are attached with their ends to clamping devices which are arranged as rails in a pit of the printing plate or plate cylinder.
- These clamping rails consist of an upper and a lower clamping rail, which can be adjusted against each other with a force to hold the pressure plate end.
- the upper clamping rail part can be arranged in a cylinder-fixed manner and the lower clamping rail part can be arranged to be movable relative to the latter, or the lower clamping rail is fixed in a cylinder-fixed manner and the upper part is movably mounted.
- DE 34 01 351 A1 discloses a quick-action clamping bar for fastening a printing plate to printing presses, which has an upper clamping rail which is fixed in a cylinder and which is arranged opposite a lower clamping rail which is movable via an eccentric or camshaft.
- the listed parts work directly in a form-fitting manner to clamp a pressure plate between the upper and lower part, so that the highest manufacturing quality must be maintained so that the clamping force is applied evenly over the entire width of the format, particularly in the case of a large-format machine.
- a quick-clamping device in the form of a tensioning rail with a cylinder-fixed upper and a radially movable lower part is known, the force to be applied for clamping a pressure plate being applied here by prestressed springs.
- the springs are pressed over. Due to the fact that the clamping force is applied by the springs, the clamping force is automatically adjusted to different plate thicknesses and furthermore the clamping force is largely evened out over the format width of the cylinder or the extension length of the tensioning rail.
- a disadvantage is that to open such a device, the corresponding force must be permanently applied by the actuating means, i.e.
- this tensioning rail is to be kept in the open state for a longer period of time and also the cylinder carrying this device is to be moved or rotated, the element designed, for example, as an actuating means which can be pressurized must be permanently supplied with compressed oil or compressed air. Furthermore, the manufacturing outlay for introducing the corresponding depressions for the spring elements to be integrated in the tensioning rail, together with the articulations for restoring elements acting on the spring elements, is to be regarded as disadvantageous.
- the object of the present invention is therefore to expand a clamping device in accordance with the preamble of claim 1 such that a spring-elastic clamping for fastening a pressure plate is possible in a structurally simple manner.
- the clamping device to be created should in particular also simplify the workflow in an automated printing form change.
- the actuating device moving the upper and the lower part is supported with a spring elasticity relative to the cylinder or the actuating device has the spring elasticity integrated so that when the clamping force is built up the actuating device with a given flexibility, in particular to different pressure plate thicknesses
- the actuating device is designed as a shaft which extends over the format width of the clamping rails (of the printing form cylinder) and on which individual cam or eccentrics are arranged at an axial distance from one another. These cams or eccentrics act directly (without the interposition of corresponding spring elements or the like) on the in particular radially movable lower part, which cooperates with the upper part of the clamping rail which is fixedly arranged in the cylinder.
- the shaft as the actuating device which extends over the format width of the cylinder (the extension length of the clamping rail), is rotatably received in bearings between the cams or eccentrics arranged in sections, so that in each case one cam or eccentric cooperating with the radially movable lower part lies between two adjacent bearing blocks.
- the spring elasticity of this embodiment according to the invention is given by the deflection of the shaft section extending between the bearing blocks, that is to say when the shaft is pivoted from the open position to the clamped position, the shaft undergoes a deflection, which thus adjusts the radially movable bottom bar to different ones Printing plate thicknesses enabled.
- the clamping device By means of the clamping device according to the invention it is not only possible to fix different printing plate thicknesses on a printing form cylinder and to generate largely uniform clamping forces over the format width of the cylinder or the length of the rail, but also new possibilities arise when changing a printing form or Printing plate.
- the actuating device designed as a shaft is pivoted into an end position both for opening and for closing (clamping) with the application of force, it is possible to move the printing form or plate cylinder even with the clamping rail open.
- the actuating device designed as a shaft is pivoted into an end position both for opening and for closing (clamping) with the application of force, it is possible to move the printing form or plate cylinder even with the clamping rail open.
- the forme cylinder is moved by turning backwards until, for example, the end of the printing form unwound from the outer circumference can be held by a holding device on the protection of the printing unit, so that when the cylinder is turned forwards, the area of the printing plate held by the opened clamping device is pulled out of this clamping gap.
- the fastening device according to the invention is particularly suitable for automating the fastening of a printing plate on the printing form cylinder or plate cylinder of a printing press. It is possible to arrange the introduction of force for the actuating device mounted in the cylinder, which is preferably designed as a shaft with cams or eccentrics, so that the corresponding coupling can take place with a cylinder position with respect to this introduction of force.
- the clamping rail can be opened and the printing plate or plate cylinder can then be moved backwards by a predetermined angular range in order to bring the end of the plate unwound from the printing plate or plate cylinder into engagement with a holding device.
- the actuating device designed as a shaft with cams or eccentrics is brought into a stable end position for opening the clamping rail, it is not necessary to apply the force for opening the clamping rail permanently. After the printing form or plate cylinder has been moved back into its starting position corresponding to the force introduction device, the clamping device can then be closed.
- the clamping rail 1 consists of an upper part 2 arranged in a cylinder-fixed manner and a radially movably mounted lower part 3, each of which is designed as a rail that extends in particular over the format width of the printing form or plate cylinder (not shown) (FIGS. 1-4).
- bearing blocks 6 are arranged below the radially movable lower part 3, axially spaced apart, into which the end of screws 4 are screwed, the shank of which is mounted in a respective longitudinal opening in a corresponding opening of the lower part 3 , Pressure springs 5 are arranged between the head of the screws 4 and a taper of the bore in the lower part 3, through which the lower part 3 is brought into the open position to open the corresponding clamping surfaces between the upper part 2 and the lower part 3.
- FIGS. 2, 5 and 6 show the straight guidance of the radially movable upper part 3 with respect to the upper part 2.
- a plurality of screws 8 are provided, axially spaced apart, which are replaced by corresponding ones Openings 8.1 are passed through in the lower part and their ends are screwed into corresponding threads in the upper part 2 of the clamping rail 1.
- the head of the screws 8 cooperates with a flat surface of the openings 8.1, which run parallel to the radial direction of movement of the lower part 3.
- a shaft 7 is rotatably received through the plurality of bearing blocks axially spaced apart and arranged below the lower part 3 and each has a cam or eccentric 9 in the areas located between the bearing blocks 6.
- the cams or eccentrics 9 of the shaft 7 each interact with a roller 10 attached in the lower region of the lower part 3 (FIGS. 3-6).
- FIG. 1 The open position of the lower part 3 relative to the upper part 2 of the clamping rail 1 according to the invention is shown in FIG.
- the shaft 7 has been pivoted in such a position that the rollers 10 of the movable lower part 3 come to rest on a smaller radius of the cams or eccentrics 9 of the shaft.
- the clamping gap of the clamping rail 1 defined by the clamping surfaces of the lower part 3 and upper part 2 is opened.
- FIG. 3 shows the closed state of the clamping rail 1, which corresponds to the clamping state.
- the rollers 10 of the lower part 3 come to rest on the large radius of the cams or eccentrics 9, so that the lower part 3 lies over the rollers 10 is pressed with a corresponding force against the cylinder-fixed upper part 2.
- a pressure plate held by the clamping surfaces between the lower part 3 and the upper part 2 is not shown.
- Figure 7 shows in principle the arrangement of the shaft 7 with a cam or eccentric 9 between two bearing blocks 6 supporting the shaft 7.
- the orientation of the shaft 7 corresponds to the open position, i.e. the position of the cam or eccentric 9 in connection with the roller 10, as shown in Figure 4. If the shaft 7 together with the cam or eccentric 9 is now pivoted into the position for closing the lower part 3, the shaft 7 experiences a deflection between the support points of the bearing blocks 6 in accordance with the applied clamping force.
Landscapes
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Clamps And Clips (AREA)
- Jigs For Machine Tools (AREA)
Abstract
Description
Die Erfindung betrifft eine Klemmeinrichtung für auf einem Formzylinder von Druckmaschinen zu befestigende Druckformen gemäß dem Oberbegriff von Anspruch 1.The invention relates to a clamping device for printing forms to be fastened on a forme cylinder of printing presses according to the preamble of claim 1.
Bei Bogenoffsetdruckmaschinen werden die als Druckplatten ausgebildeten Druckformen mit ihren Enden an Klemmeinrichtungen befestigt, die als Schienen ausgebildet in einer Grube des Druckform- bzw. Plattenzylinders angeordnet sind. Diese Klemmschienen bestehen aus einer oberen und einer unteren Klemmschiene, die zum Halten des Druckplattenendes mit einer Kraft gegeneinander anstellbar sind. Dabei kann entweder der obere Klemmschienenteil zylinderfest und der untere Klemmschienenteil relativ gegenüber diesen beweglich angeordnet sein bzw. die untere Klemmschiene ist zylinderfest befestigt und das Oberteil ist beweglich gelagert.In sheetfed offset printing presses, the printing plates designed as printing plates are attached with their ends to clamping devices which are arranged as rails in a pit of the printing plate or plate cylinder. These clamping rails consist of an upper and a lower clamping rail, which can be adjusted against each other with a force to hold the pressure plate end. In this case, either the upper clamping rail part can be arranged in a cylinder-fixed manner and the lower clamping rail part can be arranged to be movable relative to the latter, or the lower clamping rail is fixed in a cylinder-fixed manner and the upper part is movably mounted.
Aus der DE 34 01 351 A1 ist eine Schnellspannleiste zum Befestigen einer Druckplatte an Druckmaschinen bekannt, welche eine zylinderfest angeordnete obere Klemmschiene aufweist, der gegenüber eine über eine Exzenter- bzw. Nockenwelle bewegliche untere Klemmschiene angeordnet ist. Die aufgezählten Teile wirken direkt formschlüssig zum Klemmen einer Druckplatte zwischen dem Ober- und Unterteil zusammen, so daß höchste Fertigungsqualitäten einzuhalten sind, damit insbesondere bei einer großformatigen Maschine die Klemmkraft gleichmäßig über die gesamte Formatbreite aufgebracht wird. Ferner ist es als nachteilig anzusehen, daß bei einer derartigen Spannschiene die Stärke der zu befestigenden Druckform bzw. Druckplatten innerhalb eines engen Dickenbereiches zu liegen hat. Insbesondere erfolgt keine selbsttätige Anpassung der Klemmkraft an unterschiedliche Plattenstärken.DE 34 01 351 A1 discloses a quick-action clamping bar for fastening a printing plate to printing presses, which has an upper clamping rail which is fixed in a cylinder and which is arranged opposite a lower clamping rail which is movable via an eccentric or camshaft. The listed parts work directly in a form-fitting manner to clamp a pressure plate between the upper and lower part, so that the highest manufacturing quality must be maintained so that the clamping force is applied evenly over the entire width of the format, particularly in the case of a large-format machine. Furthermore, it is to be regarded as a disadvantage that in the case of such a tensioning rail, the thickness of the printing form or printing plates to be fastened has to lie within a narrow range of thicknesses. In particular, there is no automatic adaptation of the clamping force to different plate thicknesses.
Aus der DE 41 29 831 C2 ist eine Schnellklemmvorrichtung in Form einer Spannschiene mit einem zylinderfesten oberen und einem radial beweglichen Unterteil bekannt, wobei hier die zum Klemmen einer Druckplatte aufzubringende Kraft durch vorgespannte Federn aufgebracht wird. Zum Öffnen des Unterteils werden dazu die Federn überdrückt. Dadurch, daß die Klemmkraft durch die Federn aufgebracht wird, erfolgt ein selbsttätiges Anpassen der Klemmkraft an unterschiedliche Plattenstärken und ferner auch eine weitestgehende Vergleichmäßigung der Klemmkraft über die Formatbreite des Zylinders bzw. die Erstrekkungslänge der Spannschiene. Als nachteilig ist aber anzusehen, daß zum Öffnen einer derartigen Einrichtung die entsprechende Kraft durch das Stellmittel permanent aufzubringen ist, d.h. soll diese Spannschiene für eine längere Zeit im geöffneten Zustand gehalten werden und ferner auch der diese Einrichtung tragende Zylinder bewegt bzw. verdreht werden, so muß das beispielsweise als druckmittelbeaufschlagbares Stellmittel ausgebildete Element permanent mit Drucköl bzw. Druckluft versorgt werden. Ferner ist der Fertigungsaufwand zum Einbringen der entsprechenden Vertiefungen für die in der Spannschiene zu integrierenden Federelemente nebst der Anlenkungen für auf die Federelemente einwirkenden Rückstellelemente als nachteilig anzusehen.From DE 41 29 831 C2 a quick-clamping device in the form of a tensioning rail with a cylinder-fixed upper and a radially movable lower part is known, the force to be applied for clamping a pressure plate being applied here by prestressed springs. To open the lower part, the springs are pressed over. Due to the fact that the clamping force is applied by the springs, the clamping force is automatically adjusted to different plate thicknesses and furthermore the clamping force is largely evened out over the format width of the cylinder or the extension length of the tensioning rail. A disadvantage, however, is that to open such a device, the corresponding force must be permanently applied by the actuating means, i.e. If this tensioning rail is to be kept in the open state for a longer period of time and also the cylinder carrying this device is to be moved or rotated, the element designed, for example, as an actuating means which can be pressurized must be permanently supplied with compressed oil or compressed air. Furthermore, the manufacturing outlay for introducing the corresponding depressions for the spring elements to be integrated in the tensioning rail, together with the articulations for restoring elements acting on the spring elements, is to be regarded as disadvantageous.
Aus der DE 26 06 773 A1 ist eine Spannleiste zum Befestigen von Druckplatten an Druckmaschinen bekannt, bei welcher eine als Exzenter- bzw. Nockenwelle ausgebildete Betätigungseinrichtung über zwischengeschaltete Federelemente auf ein radial bewegliches Unterteil einwirkt. Das Oberteil dieser Spannschiene ist zylinderfest ausgeführt. Durch die Hintereinanderschaltung der Betätigungseinrichtung zum Schließen und Öffnen der Spannschiene und der Federn kann eine derartige Schiene ohne permanente Kraft- bzw. Druckmittelbeaufschlagung über längere Zeiten sowohl im geöffneten als auch im geschlossenen Zustand gehalten werden. Auch hier ist es als nachteilig anzusehen, daß eine Vielzahl über die Formatbreite vorzusehender Federelemente in der Spannschiene integriert sein muß, was einen entsprechenden Fertigungsaufwand darstellt.DE 26 06 773 A1 discloses a tensioning strip for fastening printing plates to printing presses, in which an actuating device designed as an eccentric or camshaft acts on a radially movable lower part via interposed spring elements. The upper part of this tensioning rail is designed as a cylinder. By connecting the actuating device in series to close and open the tensioning rail and the springs, such a rail can be kept open and closed for extended periods of time without permanent application of force or pressure medium. Here, too, it is to be regarded as disadvantageous that a large number of spring elements to be provided over the format width must be integrated in the tensioning rail, which represents a corresponding manufacturing outlay.
Aufgabe der vorliegenden Erfindung ist es daher, eine Klemmeinrichtung gemäß dem Oberbegriff von Anspruch 1 derartig zu erweitern, so daß in bautechnisch einfacher Weise eine federelastische Klemmung zur Befestigung einer Druckplatte möglich ist. Die zu schaffende Klemmeinrichtung soll insbesondere auch eine Vereinfachung des Arbeitsablaufes bei einem automatisierten Druckformwechsel ermöglichen.The object of the present invention is therefore to expand a clamping device in accordance with the preamble of claim 1 such that a spring-elastic clamping for fastening a pressure plate is possible in a structurally simple manner. The clamping device to be created should in particular also simplify the workflow in an automated printing form change.
Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale von Anspruch 1 bzw. Anspruch 4. Weiterbildungen der Erfindung ergeben sich aus den jeweiligen Unteransprüchen.This object is achieved by the characterizing features of claim 1 and claim 4. Further developments of the invention result from the respective subclaims.
Gemäß der Erfindung ist vorgesehen, daß die das Ober- bzw. das Unterteil bewegende Betätigungseinrichtung mit einer Federelastizität gegenüber dem Zylinder abgestützt ist bzw. die Betätigungseinrichtung die Federelastizität integriert aufweist, so daß beim Aufbauen der Klemmkraft die Betätigungseinrichtung mit einer vorgesehenen Nachgiebigkeit insbesondere auf unterschiedliche Druckplattenstärken und dergleichen reagiert.Erfindunggemäß ist die Betätigungseinrichtung dabei als eine sich über die Formatbreite der Spannschienen (des Druckformzylinders) erstreckende Welle ausgebildet, auf der axial voneinander beabstandet einzelne Nokken- bzw. Exzenter angeordnet sind. Diese Nocken- bzw. Exzenter wirken direkt (ohne Zwischenschaltung entsprechender Federelemente oder dergleichen) auf das insbesondere radial bewegliche Unterteil, welches mit dem Zylinder fest angeordneten Oberteil der Klemmschiene zusammenwirkt. Die sich über die Formatbreite des Zylinders (die Erstreckungslänge der Klemmschiene) erstreckende Welle als Betätigungseinrichtung ist dabei zwischen den abschnittsweise ange-ordneten Nocken bzw. Exzentern drehbar in Lagern aufgefangen, so daß vorzugsweise jeweils ein mit dem radial beweglichen Unterteil zusammenwirkender Nocken bzw. Exzenter zwischen zwei benachbarten Lagerblökken liegt. Die Federelastizität dieser erfindungsgemäßen Ausführungsform ist dabei durch die Durchbiegung der zwischen den Lagerblökken sich erstreckenden Wellenabschnittes gegeben, d.h. beim Verschwenken der Welle von der Offen-Stellung in die Klemm-Stellung erfährt die Welle eine Durchbiegung, welche somit eine Anpassung der radial beweglichen Unterleiste an unterschiedliche Druckplattenstärken ermöglicht. Ferner erfolgt somit auch eine Vergleichmäßigung der über die Formatbreite des Zylinders bzw. die Erstreckungslänge der Klemmschiene erfolgende Klemmkraft zum Halten der Druckplatte.According to the invention it is provided that the actuating device moving the upper and the lower part is supported with a spring elasticity relative to the cylinder or the actuating device has the spring elasticity integrated so that when the clamping force is built up the actuating device with a given flexibility, in particular to different pressure plate thicknesses According to the invention, the actuating device is designed as a shaft which extends over the format width of the clamping rails (of the printing form cylinder) and on which individual cam or eccentrics are arranged at an axial distance from one another. These cams or eccentrics act directly (without the interposition of corresponding spring elements or the like) on the in particular radially movable lower part, which cooperates with the upper part of the clamping rail which is fixedly arranged in the cylinder. The shaft as the actuating device, which extends over the format width of the cylinder (the extension length of the clamping rail), is rotatably received in bearings between the cams or eccentrics arranged in sections, so that in each case one cam or eccentric cooperating with the radially movable lower part lies between two adjacent bearing blocks. The spring elasticity of this embodiment according to the invention is given by the deflection of the shaft section extending between the bearing blocks, that is to say when the shaft is pivoted from the open position to the clamped position, the shaft undergoes a deflection, which thus adjusts the radially movable bottom bar to different ones Printing plate thicknesses enabled. Furthermore, there is also an equalization of the clamping force that occurs over the format width of the cylinder or the extension length of the clamping rail for holding the printing plate.
Mittels der erfindungsgemäßen Klemmeinrichtung ist es nicht nur möglich, unterschiedliche Druckplattenstärken auf einem Druckformzylinder zu befestigen und dabei auch über die Formatbreite des Zylinders bzw. die Länge der Schiene weitestgehend gleichmäßige Klemmkräfte zu erzeugen, sondern es ergeben sich auch neue Möglichkeiten beim Wechseln einer Druckform bzw. Druckplatte.By means of the clamping device according to the invention it is not only possible to fix different printing plate thicknesses on a printing form cylinder and to generate largely uniform clamping forces over the format width of the cylinder or the length of the rail, but also new possibilities arise when changing a printing form or Printing plate.
Dadurch, daß die als Welle ausgebildete Betätigungseinrichtung sowohl zum Öffnen als auch zum Schließen (Klemmen) unter Kraftaufbringung jeweils in eine Endstellung verschwenkt wird, ist es möglich, den Druckform- bzw. Plattenzylinder auch mit geöffneter Klemmschiene zu verfahren. Insbesondere zum Abfördern einer auf dem Druckformzylinder befindlichen gebrauchten Druckform (Druckplatte) ist es möglich, den Zylinder zunächst in eine vorgegebene Winkelposition zu verfahren und daraufhin die Klemmschiene zu öffnen. Dann wird der Formzylinder durch Rückwärtsdrehen soweit verfahren, bis beispielsweise das Ende der vom Außenumfang abgewickelten Druckform von einer Halteeinrichtung am Schutz des Druckwerkes gehalten werden kann, so daß beim Vorwärtsdrehen des Zylinders der durch die geöffnete Klemmeinrichtung gehaltene Bereich der Druckplatte aus diesem Klemmspalt herausgezogen wird.Because the actuating device designed as a shaft is pivoted into an end position both for opening and for closing (clamping) with the application of force, it is possible to move the printing form or plate cylinder even with the clamping rail open. In particular for removing a used printing form (printing plate) located on the printing form cylinder, it is possible to first move the cylinder into a predetermined angular position and then to open the clamping rail. Then the forme cylinder is moved by turning backwards until, for example, the end of the printing form unwound from the outer circumference can be held by a holding device on the protection of the printing unit, so that when the cylinder is turned forwards, the area of the printing plate held by the opened clamping device is pulled out of this clamping gap.
Durch das zuvorstehend beschriebene erfindungsgemäße Herausfördern der gebrauchten Druckform aus der geöffneten Klemmeinrichtung des Formzylinders ist es möglich, daß die vom Formzylinder abgeförderte Druckform erst nach dem Aufziehen einer neuen Druckform auf den Formzylinder aus der lagefixierten Position entnommen wird. Dadurch kann bei einer vollautomatischen Wechseleinrichtung nicht nur eine Einrichtung zum Herausziehen der gebrauchten Druckform aus der Klemmeinrichtung entfallen, sondern auch bei einem halbautomatischem Wechselvorgang vereinfacht sich der Handhabungsaufwand für eine Bedienperson.By the above-described conveying out of the used printing form according to the invention from the open clamping device of the forme cylinder, it is possible for the printing form conveyed away from the forme cylinder to be removed from the positionally fixed position only after a new printing form has been pulled onto the form cylinder. As a result, not only can a device for pulling out the used printing form from the clamping device be omitted in the case of a fully automatic changing device, but also the handling effort for an operator is simplified in the case of a semi-automatic changing process.
Die erfindungsgemäße Befestigungseinrichtung eignet sich insbesondere für eine Automatisierung der Befestigung einer Druckplatte auf dem Druckformzylinder bzw. Plattenzylinder einer Druckmaschine. Dabei ist es möglich, die Krafteinleitung für die im Zylinder angebrachte Betätigungseinrichtung, welche vorzugsweise als Welle mit Nocken bzw. Exzentern ausgebildet ist, gestellfest anzuordnen, so daß die entsprechende Kopplung bei einer Zylinderstellung gegenüber dieser Krafteinleitung erfolgen kann. So kann wie zuvorstehend angedeutet die Klemmschiene geöffnet werden und daraufhin der Druckform- bzw. Plattenzylinder um einen vorgesehenen Winkelbereich rückwärts verfahren werden, um das Ende der vom Druckform- bzw. Plattenzylinder abgewickelten Platte in Eingriff mit einer Halteeinrichtung zu bringen. Dadurch, daß die als Welle mit Nocken bzw. Exzentern ausgebildete Betätigungseinrichtung zum Öffnen der Klemmschiene in eine stabile Endlage gebracht ist, ist es nicht nötig, die Kraft zum Öffnen der Klemmschiene permanent aufzubringen. Nach dem dann der Druckform- bzw. Plattenzylinder wieder in seine Ausgangsstellung mit der Krafteinleitungseinrichtung korrespondierend verfahren worden ist kann dann das Schließen der Klemmeinrichtung erfolgen.The fastening device according to the invention is particularly suitable for automating the fastening of a printing plate on the printing form cylinder or plate cylinder of a printing press. It is possible to arrange the introduction of force for the actuating device mounted in the cylinder, which is preferably designed as a shaft with cams or eccentrics, so that the corresponding coupling can take place with a cylinder position with respect to this introduction of force. Thus, as indicated above, the clamping rail can be opened and the printing plate or plate cylinder can then be moved backwards by a predetermined angular range in order to bring the end of the plate unwound from the printing plate or plate cylinder into engagement with a holding device. Characterized in that the actuating device designed as a shaft with cams or eccentrics is brought into a stable end position for opening the clamping rail, it is not necessary to apply the force for opening the clamping rail permanently. After the printing form or plate cylinder has been moved back into its starting position corresponding to the force introduction device, the clamping device can then be closed.
Des weiteren erfolgt die Erläuterung eines Ausführungsbeispieles der Erfindung anhand der Zeichnungen.Furthermore, an embodiment of the invention is explained with reference to the drawings.
Es zeigt:
- Fig. 1 - 4
- den Schnitt durch die erfindungsgemäße Klemmvorrichtung,
- Fig. 5 + 6
- die Ansicht eines Ausschnittes der erfindungsgemäßen Klemmeinrichtung, und
- Fig. 7 + 8
- das Prinzip der federelastischen Wirkung der Betätigungseinrichtung der Klemmschiene.
- 1-4
- the section through the clamping device according to the invention,
- 5 + 6
- the view of a section of the clamping device according to the invention, and
- Fig. 7 + 8
- the principle of the resilient effect of the actuating device of the clamping rail.
Die erfindungsgemäße Klemmschiene 1 besteht aus einem zylinderfest angeordneten Oberteil 2 und einem radial beweglich gelagerten Unterteil 3, welche jeweils als insbesondere über die Formatbreite des nicht dargestellten Druckform- bzw. Plattenzylinder sich erstreckende Schienen ausgebildet sind (Fig. 1 - 4).The clamping rail 1 according to the invention consists of an upper part 2 arranged in a cylinder-fixed manner and a radially movably mounted lower part 3, each of which is designed as a rail that extends in particular over the format width of the printing form or plate cylinder (not shown) (FIGS. 1-4).
Wie in Figur 1 in Verbindung mit den Figuren 5 und 6 dargestellt sind unterhalb des radial beweglichen Unterteiles 3 axial voneinander beabstandet Lagerblöcke 6 angeordnet, in welche das Ende von Schrauben 4 eingedreht sind, deren Schaft längsbeweglich in je einer entsprechenden Öffnung des Unterteils 3 gelagert ist. Zwischen dem Kopf der Schrauben 4 und einer Verjüngung der Bohrung im Unterteil 3 sich abstützend sind Druckfedern 5 angeordnet, durch welche das Unterteil 3 zum Öffnen der entsprechenden Klemmflächen zwischen dem Oberteil 2 und dem Unterteil 3 in die geöffnete Stellung verbracht wird.As shown in FIG. 1 in conjunction with FIGS. 5 and 6, bearing blocks 6 are arranged below the radially movable lower part 3, axially spaced apart, into which the end of screws 4 are screwed, the shank of which is mounted in a respective longitudinal opening in a corresponding opening of the lower part 3 , Pressure springs 5 are arranged between the head of the screws 4 and a taper of the bore in the lower part 3, through which the lower part 3 is brought into the open position to open the corresponding clamping surfaces between the upper part 2 and the lower part 3.
Die Figuren 2, 5 und 6 zeigen die Geradführung des radial beweglichen Oberteils 3 gegenüber dem Oberteil 2. Vorgesehen sind hierzu axial voneinander beabstandet mehrere Schrauben 8, welche durch entsprechende Öffnungen 8.1 im Unterteil hindurch geführt und deren Enden in entsprechende Gewinde im Oberteil 2 der Klemmschiene 1 eingedreht sind. Der Kopf der Schrauben 8 wirkt dabei jeweils mit einer Planfläche der Öffnungen 8.1 zusammen, welche parallel zur radialen Bewegungsrichtung des Unterteils 3 verlaufen.FIGS. 2, 5 and 6 show the straight guidance of the radially movable upper part 3 with respect to the upper part 2. For this purpose, a plurality of screws 8 are provided, axially spaced apart, which are replaced by corresponding ones Openings 8.1 are passed through in the lower part and their ends are screwed into corresponding threads in the upper part 2 of the clamping rail 1. The head of the screws 8 cooperates with a flat surface of the openings 8.1, which run parallel to the radial direction of movement of the lower part 3.
Durch die mehreren axial voneinander beabstandeten und unterhalb des Unterteils 3 angeordneten Lagerblöcke ist eine Welle 7 drehbar aufgenommen hindurch geführt, welche in den zwischen den Lagerblökken 6 gelegenen Bereichen jeweils einen Nocken bzw. Exzenter 9 aufweist. Die Nocken bzw. Exzenter 9 der Welle 7 wirken mit jeweils einer im unteren Bereich des Unterteils 3 angebrachten Rolle 10 zusammen (Figur 3 - 6).A shaft 7 is rotatably received through the plurality of bearing blocks axially spaced apart and arranged below the lower part 3 and each has a cam or eccentric 9 in the areas located between the bearing blocks 6. The cams or eccentrics 9 of the shaft 7 each interact with a roller 10 attached in the lower region of the lower part 3 (FIGS. 3-6).
In Figur 4 ist die geöffnete Stellung des Unterteiles 3 gegenüber dem Oberteil 2 der erfindungsgemäßen Klemmschiene 1 dargestellt. Die Welle 7 ist dabei in einer derartige Stellung verschwenkt worden, so daß die Rollen 10 des beweglichen Unterteils 3 auf einem kleineren Radius der Nocken bzw. Exzenter 9 der Welle zum Liegen kommen. Demzufolge ist der durch die Klemmflächen des Unterteils 3 und Oberteils 2 definierte Klemmspalt der Klemmschiene 1 geöffnet.The open position of the lower part 3 relative to the upper part 2 of the clamping rail 1 according to the invention is shown in FIG. The shaft 7 has been pivoted in such a position that the rollers 10 of the movable lower part 3 come to rest on a smaller radius of the cams or eccentrics 9 of the shaft. As a result, the clamping gap of the clamping rail 1 defined by the clamping surfaces of the lower part 3 and upper part 2 is opened.
Figur 3 zeigt die geschlossene, dem Klemm-Zustand entsprechenden Zustand der Klemmschiene 1. Durch Verschwenken der Welle 7 kommen die Rollen 10 des Unterteils 3 auf dem großen Radius der Nocken - bzw. Exzenter 9 zum Liegen, so daß das Unterteil 3 über die Rollen 10 mit einer entsprechenden Kraft gegen das zylinderfeste Oberteil 2 gedrückt wird. Eine durch die Klemmflächen zwischen dem Unterteil 3 und dem Oberteil 2 gehaltene Druckplatte ist nicht dargestellt.FIG. 3 shows the closed state of the clamping rail 1, which corresponds to the clamping state. By pivoting the shaft 7, the rollers 10 of the lower part 3 come to rest on the large radius of the cams or eccentrics 9, so that the lower part 3 lies over the rollers 10 is pressed with a corresponding force against the cylinder-fixed upper part 2. A pressure plate held by the clamping surfaces between the lower part 3 and the upper part 2 is not shown.
Figur 7 zeigt prinzipiell die Anordnung der Welle 7 mit einem Nocken bzw. Exzenter 9 zwischen zwei die Welle 7 lagernden Lagerblöcken 6. Die Orientierung der Welle 7 entspricht hierbei der geöffneten Stellung, d.h. der Stellung des Nockens bzw. Exzenters 9 in Verbindung mit der Rolle 10, wie dies in Figur 4 dargestellt ist. Wird nun die Welle 7 nebst Nocken bzw. Exzenter 9 in die Stellung zum Schließen des Unterteils 3 verschwenkt, so erfährt die Welle 7 zwischen den Stützstellen der Lagerblöcke 6 jeweils eine Durchbiegung entsprechend der aufgebrachten Klemmkraft.Figure 7 shows in principle the arrangement of the shaft 7 with a cam or eccentric 9 between two bearing blocks 6 supporting the shaft 7. The orientation of the shaft 7 corresponds to the open position, i.e. the position of the cam or eccentric 9 in connection with the roller 10, as shown in Figure 4. If the shaft 7 together with the cam or eccentric 9 is now pivoted into the position for closing the lower part 3, the shaft 7 experiences a deflection between the support points of the bearing blocks 6 in accordance with the applied clamping force.
In Figur 8 ist die Durchbiegung der Welle 7 zur Verdeutlichung des Prinzips übertrieben dargestellt.In Figure 8, the deflection of the shaft 7 is shown exaggerated to illustrate the principle.
- 11
- Klemmschieneclamping rail
- 22
- Oberteiltop
- 33
- Unterteillower part
- 44
- Schraubescrew
- 55
- Druckfedercompression spring
- 66
- Lagerblockbearing block
- 77
- Wellewave
- 88th
- Schraubescrew
- 8.18.1
- Öffnung (Unterteil 3)Opening (lower part 3)
- 99
- Nocke / ExzenterCam / eccentric
- 1010
- Rolle (Unterteil 3)Roll (lower part 3)
Claims (6)
- Clamping device for fixing printing formes on the forme cylinder of printing presses, particularly for fixing printing plates on the plate cylinder of offset sheet printing presses, consisting of an upper and a lower part (2, 3), wherein the one part is mounted fast with respect to the cylinder and the other part cooperating correspondingly therewith movably in at least the approximately radial direction of the cylinder, an actuation device (7) acting on the movable lower or upper part for opening and clamping, as well as components (9, 10) transferring the clamping force in resilient fashion to the movable lower or upper part, characterised in that at least one component of the actuation unit (7) acting on the movable lower or upper part (3, 2) has a resilience becoming effective on the build-up of the clamping force, for which the actuation unit is constructed as a shaft (7) which is supported fixed relative to the cylinder via bearings (6) spaced axially from one another and is bendable between the bearings (6) by the clamping force to be applied in each case to a predetermined extent.
- Clamping device according to Claim 1, characterised in that the shaft (7) has between each two bearings (6) in each case at least one cam or an eccentric (9) cooperating with the lower or upper part (3, 2).
- Clamping device according to Claim 2, characterised in that the lower or upper part (3, 2) respectively has in each case a roller (10) cooperating with the cam or the eccentric (9) of the shaft (7).
- Process for changing printing formes of the forme cylinder of printing presses, particularly for changing printing plates of the plate cylinder of offset sheet printing presses, wherein after the opening of a clamping device arranged at the print start of the cylinder and holding the front edge of the printing forme, the printing forme is pulled out from the grasping region of the clamping device and wherein for opening and closing the clamping device, the forme cylinder is moved into a preset position and for changing the printing forme turned in a preset direction, using a clamping device in accordance with one of Claims 1 to 3, characterised in that after the opening of the clamping device - arranged relative to the print start of the cylinder and holding the front edge of the printing forme, the forme cylinder is turned backwards through a predetermined angular amount, that the printing forme at the end of the movement is fixed in position by holding at least one part of the printing forme and that thereafter the forme cylinder is turned forwards until the front edge of the printing forme has been pulled out from the opened clamping device.
- Process according to Claim 4, characterised in that after the positional fixing of the printing forme, the forme cylinder is again turned forwards into the position in which the opening of the clamping device holding the front edge of the printing forme takes place and in this position, a new printing forme is introduced into the opened grasping region of the clamping device.
- Process according to Claim 4 or 5, characterised in that the printing forme fed away from the forme cylinder is taken out from the positionally fixed position after the pulling on of a new printing forme on to the forme cylinder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19718234 | 1997-04-30 | ||
| DE19718234 | 1997-04-30 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0875378A1 EP0875378A1 (en) | 1998-11-04 |
| EP0875378B1 EP0875378B1 (en) | 2000-07-19 |
| EP0875378B2 true EP0875378B2 (en) | 2003-09-10 |
Family
ID=7828199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98106692A Expired - Lifetime EP0875378B2 (en) | 1997-04-30 | 1998-04-11 | Clamping device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0875378B2 (en) |
| JP (1) | JP2975002B2 (en) |
| AT (1) | ATE194801T1 (en) |
| DE (3) | DE59800202D1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10241284B3 (en) * | 2002-09-06 | 2004-03-18 | Koenig & Bauer Ag | Clamping device for fixing a plate, especially a printing plate, on the periphery of a cylinder comprises a first clamping element, a pivotably mounted second clamping element |
| DE202018001624U1 (en) * | 2018-03-28 | 2019-07-03 | Herold Maschinenbau Gmbh | Clamping device for fastening printing plates on a plate cylinder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1265163B (en) * | 1965-03-20 | 1968-04-04 | Heidelberger Druckmasch Ag | Device for fastening a flexible printing plate on the forme cylinder of a rotary printing press |
| DE2606773C3 (en) * | 1976-02-19 | 1984-06-20 | Erich 4600 Dortmund Bock | Device for fastening and tensioning a flexible printing plate on or on a forme cylinder of a rotary printing press |
| DE3401351A1 (en) * | 1984-01-17 | 1985-07-25 | Horst 5600 Wuppertal Kieper | Quick-acting clamping strip for attaching a printing plate to printing machines |
| JP2509511Y2 (en) * | 1990-05-25 | 1996-09-04 | 株式会社小森コーポレーション | Printing plate vise device |
| DE4129831C3 (en) * | 1990-12-21 | 1998-08-13 | Heidelberger Druckmasch Ag | Quick clamp device |
-
1998
- 1998-04-11 EP EP98106692A patent/EP0875378B2/en not_active Expired - Lifetime
- 1998-04-11 AT AT98106692T patent/ATE194801T1/en not_active IP Right Cessation
- 1998-04-11 DE DE59800202T patent/DE59800202D1/en not_active Expired - Lifetime
- 1998-04-17 DE DE19816996A patent/DE19816996A1/en not_active Withdrawn
- 1998-04-17 DE DE19816995A patent/DE19816995B4/en not_active Expired - Fee Related
- 1998-04-28 JP JP10118870A patent/JP2975002B2/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| Formelsammlung Technische Mechanik, Institut für Mechanik, 1978, Seite 36 † |
| Hoischer, Technisches Zeichnen, 17. Auflage, Seiten 60-61 † |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19816996A1 (en) | 1998-11-05 |
| DE19816995B4 (en) | 2008-09-11 |
| DE19816995A1 (en) | 1998-11-05 |
| EP0875378B1 (en) | 2000-07-19 |
| EP0875378A1 (en) | 1998-11-04 |
| JPH10305561A (en) | 1998-11-17 |
| ATE194801T1 (en) | 2000-08-15 |
| DE59800202D1 (en) | 2000-08-24 |
| JP2975002B2 (en) | 1999-11-10 |
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