EP0567746B1 - Device for attaching printing plates on the plate cylinder of a printing press, particularly an offset sheet printing press - Google Patents
Device for attaching printing plates on the plate cylinder of a printing press, particularly an offset sheet printing press Download PDFInfo
- Publication number
- EP0567746B1 EP0567746B1 EP93103813A EP93103813A EP0567746B1 EP 0567746 B1 EP0567746 B1 EP 0567746B1 EP 93103813 A EP93103813 A EP 93103813A EP 93103813 A EP93103813 A EP 93103813A EP 0567746 B1 EP0567746 B1 EP 0567746B1
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- EP
- European Patent Office
- Prior art keywords
- bending
- plate cylinder
- printing
- bar
- 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.)
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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
- B41F27/1206—Feeding to or removing from the forme cylinder
Definitions
- the invention relates to a device for mounting printing plates on the plate cylinder of printing machines according to the preamble of claim 1.
- a printing plate is attached to the plate cylinder by means of tensioning rails arranged in a cylinder channel and assigned to the printing start and the printing end, for which purpose the printing start of the printing plate is inserted (clamped) into the corresponding tensioning rail and then the printing end is also clamped in the second tensioning rail and then under Force is tensioned.
- the plate cylinder is first rotated into a position in which the tensioning rail assigned to the start of printing is easily accessible and the printing plate can be inserted into it with an edge. After clamping the start of the print, the plate cylinder is slowly rotated forward until the print end clamping rail is also easily accessible and the trailing end of the printing plate can be inserted into this printing end clamping rail.
- DE 3 940 795 C2 From DE 3 940 795 C2, DE 3 940 796 C2 and EP 0 431 575 A2 systems for automatic printing plate change are known, in which the feeding and mounting of a new printing plate on the plate cylinder takes place automatically. In addition to storage and receiving areas for the printing plates, these systems also have transport devices for feeding the new printing plates. These feed systems include on the outer circumference of the plate cylinder to or from this pressure rollers, which should in particular after appropriate positioning of the plate cylinder to insert the printing end of the printing plate into the corresponding tensioning rail.
- the pressure roller according to EP 0 431 575 A2 is arranged on the pivotable end of a printing plate magazine which can be set on the plate cylinder and is therefore unable to exert sufficient pressing forces of the printing plate on the outer circumference of the plate cylinder due to the lever ratios recognizable in this document.
- Another pressure roller is only used to insert the bent printing end of the printing plate into the tensioning rail.
- the pressure roller provided jointly in the two German patents serves, in particular, to place the non-folded end of the pressure plate on an open tensioning rail, so that this end can be fastened by closing a clamping flap.
- the plate cylinder must be moved with respect to the pressure roller into a position in which the pressure roller can only partially and thus incompletely press the pressure plate against the plate cylinder.
- the tightening torque exerted by this pressure roller on the pressure plate during the pulling-up process when the plate cylinder rotates forward can thus be lost again in this phase.
- the object of the present invention is therefore a device for mounting printing plates on the plate cylinder of To improve printing machines according to the preamble of claim 1 such that it is possible to open and insert non-folded printing plates in a printing end clamping rail with a sufficiently high elevator torque.
- an actuatable folding bar is assigned to a known pressure roller.
- the pressure roller (adjustable and removable) presses a new printing plate against the outer circumference of the plate cylinder during the slow forward rotation of the plate cylinder.
- the pinch roller corresponds to the area of the printing end of the plate cylinder, the forward rotation stops.
- the folding bar is now actuated so that the printing plate is bent over the entire format width around the edge of the plate cylinder located beyond the printing end and comes to rest with its end edge on a stop of the rear tensioning rail.
- the trailing end of the pressure plate can now be gripped by the opened tensioning rail, which can be done, for example, by closing an open clamping flap, by moving a circumferentially adjustable tensioning rail or by swiveling forward an appropriately mounted tensioning rail.
- the entire mounting process for a new printing plate takes place with the blanket cylinder parked by the plate cylinder.
- the entire elevator torque for the new pressure plate is thus caused exclusively by the pressure roller, which has a rubber coating, for example.
- the printing plate Due to the foldable strip, which, like the pressure roller, also extends and can be actuated across the format width of the printing plate, the printing plate is bent during the mounting process. A new pressure plate does not have to be opened with a special device. Since the bending of the printing plate takes place on the plate cylinder, the circumferential aspect ratios of the plate cylinder are taken into account precisely. Printing plates that have already been used can easily be mounted by the device according to the invention.
- the device for mounting printing plates on the plate cylinder of printing machines according to the invention can be used both in fully automatic printing plate changing systems, as stated in the introduction, and in semi-automatic devices for changing printing plates.
- devices of the latter type there are no storage chambers or conveying devices for the new or old printing plates, but these processes are carried out by hand. With such devices, only the opening and closing of the tensioning rails, the tensioning of the printing plate via the printing end tensioning rail and the corresponding positioning processes of the plate cylinder can be carried out automatically.
- 1 to 4 each show a plate cylinder 1, in the cylinder pit 2 of which a front and rear clamping rail 3, 4 assigned to the printing start DA and the printing end DE is arranged.
- the front clamping rail 3 consists of an upper and a lower clamping rail, the lower clamping rail being movable relative to the upper clamping rail for opening or closing a detection area provided for the pressure plate 5.
- the rear tensioning rail 4 also consists of an upper and a lower clamping rail, the lower clamping rail also being movable relative to the upper one, and the printing end of a printing plate thereby being insertable between these parts.
- the rear tensioning rail 4 is also pivotally arranged in the cylinder pit 2, the position shown corresponding to a fully open position of the tensioning rail 4.
- the plate cylinder 1 is in a position in which a pressure plate 5 can be inserted into the open front clamping rail 3.
- the pressure roller 6 now runs over the outer contour of the tensioning rail 3 and now presses the pressure plate 5 against its outer circumference during further rotation (FIG. 2).
- the forward rotation of the plate cylinder 1 is continued by correspondingly controlling the printing unit drive until the pressure roller 6 comes to rest in a region of the printing end DE of the plate cylinder 1.
- the trailing end of the mounted pressure plate 5 thus protrudes almost in the tangential direction (Fig. 3).
- a folding bar 8 extending parallel to its axis and also extending over the format width of the plate cylinder 1, which is described by a storage described in more detail below and an actuating device can be moved from a position according to FIGS. 1 to 3 into a position for folding the trailing end of the pressure plate 5 (FIG. 4).
- the attachment and storage of the folding bar 8 relative to the pressure roller 6 or its bearing lever 7 is such that the pressure plate 5 held by the pressure roller 6 in the area of the printing end DE is bent exactly around a bevel 9 of the plate cylinder 1 located beyond the printing end DE (Fig. 5).
- the rear edge of the pressure plate 5 advantageously comes to rest on a correspondingly designed stop surface 10 of the fully open tensioning rail 4 - that is to say in this case the fully pivoted-back tensioning rail 4.
- the stop surface 10 on the rear clamping rail 4, like the folding strip 8, extends over the entire format width of the plate cylinder 1.
- FIG. 5 the bearing of the pressure roller 6 and the folding bar 8 is shown again in more detail along with their profile having a curvature in the area of action (the relevant representations in FIGS. 1 to 4 are only to be understood in principle).
- the pressure roller 6 can be rotated on both side frame walls 12 of the printing press (not shown) at one end of a respective bearing lever 7 attached.
- the frame-side pivot axis of the bearing lever 7 can be formed, for example, by a crossmember 11, to which the anti-run-in protection, not shown here, is also attached between the plate cylinder 1 and the blanket cylinder, not shown (FIGS. 5 and 7).
- the pressure roller 6 is rotatably mounted on this axis 13.
- the pressure roller 6 is advantageously divided into individual sections, each section consisting of a cylindrical sleeve 14, each of which is mounted on the axle 13 via a pair of radial bearings 15 (e.g. needle bearings).
- the sleeves 14 have, for example, a rubber-like coating which has a hardness of, for example, 50 Shore / A.
- the sectioning of the pressure roller 6 into individual sleeves 14 results in a degree of deflection compensation of the pressure roller 6 with respect to the plate cylinder 1.
- a deflection compensation of the pressure roller 6, especially in large-format machines, can also be done in a simple manner by means of a correspondingly pre-bent axis 13, also with segmentation the pressure roller 6 take place. Further measures for deflection compensation can also be provided.
- the folding bar 8 is mounted above the fastening area of the axis 13 via a slot 16 and a screw 17 so as to be movable with respect to the bearing levers 7.
- the direction of extension of the elongated hole 16 corresponds to the mobility of the folding bar 8 with respect to the plate cylinder 1 as shown in FIGS. 4, 5.
- the spring bar 8 can always be pressed into a parked starting position with respect to the bearing levers 7 by spring means (not shown). This position corresponds to the positions of the folding bar 8 in FIGS. 1 to 3.
- the bending bar 8 can also be pre-bent for deflection compensation in the direction of extension or curved accordingly with its front edge.
- the folding bar 8 can also have a profile that prevents deflection.
- the piston rods are articulated, for example, by double-acting, pressurized air cylinders to turn the pressure roller 6 on and off.
- the pressure roller 6 can thus be pivoted from the positions shown in dashed lines in FIGS. 1 and 5 (turned off) into the employed position.
- the force ratios of the working cylinders and the lever ratios of the articulation on the bearing levers 7 are such that the pressure roller 6 experiences the desired pressure force of the pressure plate 5 with respect to the plate cylinder 1. So that the pressure roller 6 is not immersed in the cylinder pit 2 of the plate cylinder 1 (position of the plate cylinder 1 as in FIG. 1), stops can be provided on the bearing levers 7, which are supported on the bearer rings of the plate cylinder 1 (not shown). To avoid damaging the surfaces of the bearer rings 7 appropriate stops with e.g. Polyamide may be provided.
- a double-acting, pressurized air cylinder 19 is arranged on each of the two side frame walls 12, the piston rod of which is articulated on one arm of an angled double lever 20.
- the double levers 20 are each pivoted about a hinge pin 21.
- the free ends of the double lever 20 each have a roller 22, via which the double lever 20 can act on the folding bar 8.
- the angulation of the double lever 20 and the attachment of the hinge pin 21 is included chosen such that the folding bar 8 is pushed forward when the pressure roller 6 is engaged when switching the working cylinder 19 via the rollers 22 from the initial position (spring force) into the position provided for folding the pressure plate 5 (FIGS. 5 and 6).
- the folding bar 8 reaches its starting position again.
- the double lever 20 is pivoted back by such an angular amount that the folding bar 8 does not experience any hindrance when the pressure roller 6 is switched off by the roller 22 (the basic position of the double lever 20 is shown in broken lines in FIG. 6).
- the folding bar 8 shows a particularly advantageous profile for the folding strip according to the invention.
- the folding bar 8 here has the arcuate profile of a pipe section which is rotatably mounted about the axis 13 of the pressure roller 6 by a certain angle (arrow). Due to this profile, the folding bar 8 (its end acting on the pressure plate 5) can be attached very close to the pressure roller 6 and also has a very high deflection stiffness.
- a folding bar 8 configured in this way is rotatably supported at least at its ends about the axis 13 by means of arms (not shown) and, as indicated above, is actuated by the double lever 20 in the pivoted-on state of the pressure roller 6.
- Another advantage of such profiling is the protective function for the pressure roller 6 when the folding bar is pivoted back.
- the folding bar 8 shown in profile in FIG. 8 can be rotatably supported about the axis 13 by means of more than two arms attached to the ends, each of which is guided in the area of the axially spaced sleeves 14 of the pressure roller 6 to the axis 13 (cf. Fig. 7).
- Such multiple storage of the folding bar 8 with respect to the axis 13 results in an increase in the bending stiffness of the pressure roller 6.
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- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Rotary Presses (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum Aufziehen von Druckplatten auf den Plattenzylinder von Druckmaschinen gemäß dem Oberbegriff von Anspruch 1.The invention relates to a device for mounting printing plates on the plate cylinder of printing machines according to the preamble of
Bei Bogenoffsetdruckmaschinen wird eine Druckplatte auf den Plattenzylinder mittels in einem Zylinderkanal angeordneter und jeweils dem Druckanfang und dem Druckende zugeordneter Spannschienen befestigt, wozu der Druckanfang der Druckplatte in die entsprechende Spannschiene eingelegt (geklemmt) und dann das Druckende in der zweiten Spannschiene ebenfalls geklemmt und sodann unter Kraftaufwendung gespannt wird. Für diesen Aufziehvorgang wird zunächst der Plattenzylinder in eine Position verdreht, bei welcher die dem Druckanfang zugeordnete Spannschiene gut zugänglich ist und die Druckplatte mit einer Kante in diese eingeführt werden kann. Nach dem Klemmen des Druckanfanges wird der Plattenzylinder im langsam soweit vorwärts gedreht, bis die Druckende-Spannschiene ebenfalls gut zugänglich ist und das nachlaufende Ende der Druckplatte in eben diese Druckende-Spannschiene eingeführt werden kann. Für den registergerechten Sitz der Druckplatte auf dem Plattenzylinder ist neben dem exakten Ausrichten bzw. Anlegen der Druckanfangkante der Druckplatte auch das möglichst gleichmäßige Aufziehen der Druckplatte während des Vorwärtsdrehens des Plattenzylinders von großer Bedeutung. Ungleichmäßigkeiten im Aufzugsmoment über die Formatbreite müßten somit durch aufwendige Nachjustierungen korrigiert werden.In sheet-fed offset printing machines, a printing plate is attached to the plate cylinder by means of tensioning rails arranged in a cylinder channel and assigned to the printing start and the printing end, for which purpose the printing start of the printing plate is inserted (clamped) into the corresponding tensioning rail and then the printing end is also clamped in the second tensioning rail and then under Force is tensioned. For this mounting process, the plate cylinder is first rotated into a position in which the tensioning rail assigned to the start of printing is easily accessible and the printing plate can be inserted into it with an edge. After clamping the start of the print, the plate cylinder is slowly rotated forward until the print end clamping rail is also easily accessible and the trailing end of the printing plate can be inserted into this printing end clamping rail. For the registration of the printing plate on the plate cylinder in accordance with the register, in addition to the exact alignment or application of the printing edge of the printing plate, it is also very important to pull the printing plate as evenly as possible while the plate cylinder is rotating forwards. Irregularities in the elevator torque across the format width would therefore have to be corrected by complex readjustments become.
Aus der DE 3 940 795 C2, der DE 3 940 796 C2 sowie der EP 0 431 575 A2 sind Systeme zum automatischen Druckplattenwechsel bekannt, bei welchen das Zuführen und das Aufziehen einer neuen Druckplatte auf den Plattenzylinder selbsttätig abläuft. Diese Systeme weisen neben Speicher- und Aufnahmebereichen für die Druckplatten auch Transporteinrichtungen zum Zuführen der neuen Druckplatten auf. Diese Zuführsysteme umfassen u.a. an dem Außenumfang des Plattenzylinders an- bzw. von diesem abstellbare Andrückrollen, welche insbesondere nach entsprechender Positionierung des Plattenzylinders das Druckende der Druckplatte in die entsprechende Spannschiene einführen soll. Die Andrückrolle gemäß der EP 0 431 575 A2 ist an dem schwenkbaren Ende eines an dem Plattenzylinder anstellbaren Druckplattenmagazins angeordnet und vermag somit aufgrund der in dieser Schrift erkennbaren Hebelverhältnisse keine ausreichenden Andruckkräfte der Druckplatte an den Außenumfang des Plattenzylinders aufzubringen. Eine weitere Andrückrolle dient lediglich dem Einführen des abgekanteten Druckendes der Druckplatte in die Spannschiene.From DE 3 940 795 C2, DE 3 940 796 C2 and EP 0 431 575 A2 systems for automatic printing plate change are known, in which the feeding and mounting of a new printing plate on the plate cylinder takes place automatically. In addition to storage and receiving areas for the printing plates, these systems also have transport devices for feeding the new printing plates. These feed systems include on the outer circumference of the plate cylinder to or from this pressure rollers, which should in particular after appropriate positioning of the plate cylinder to insert the printing end of the printing plate into the corresponding tensioning rail. The pressure roller according to EP 0 431 575 A2 is arranged on the pivotable end of a printing plate magazine which can be set on the plate cylinder and is therefore unable to exert sufficient pressing forces of the printing plate on the outer circumference of the plate cylinder due to the lever ratios recognizable in this document. Another pressure roller is only used to insert the bent printing end of the printing plate into the tensioning rail.
Die in den beiden deutschen Patentschriften gemeinsam vorgesehene Andrückrolle dient insbesondere dazu, das nicht abgekantete Ende der Druckplatte auf eine geöffnete Spannschiene aufzulegen, so daß dieses Ende durch Schließen einer Klemmklappe befestigt werden kann. Dazu muß jedoch, wie insbesondere jeweils aus den Figuren 3 dieser Schriften erkennbar, der Plattenzylinder bezüglich der Andrückrolle in eine Position verfahren werden, bei dem die Andrückrolle die Druckplatte nur noch teilweise und damit unvollständig gegen den Plattenzylinder zu pressen vermag. Das während des Aufziehvorganges beim Vorwärtsdrehen des Plattenzylinders durch diese Andrückrolle auf die Druckplatte ausgeübte Anzugsmoment kann somit in dieser Phase wieder verloren gehen.The pressure roller provided jointly in the two German patents serves, in particular, to place the non-folded end of the pressure plate on an open tensioning rail, so that this end can be fastened by closing a clamping flap. For this purpose, however, as can be seen in particular from FIGS. 3 and 3 of these documents, the plate cylinder must be moved with respect to the pressure roller into a position in which the pressure roller can only partially and thus incompletely press the pressure plate against the plate cylinder. The tightening torque exerted by this pressure roller on the pressure plate during the pulling-up process when the plate cylinder rotates forward can thus be lost again in this phase.
Aufgabe der vorliegenden Erfindung ist es somit eine Vorrichtung zum Aufziehen von Druckplatten auf den Plattenzylinder von Druckmaschinen gemäß dem Oberbegriff von Anspruch 1 derartig zu verbessern, so daß ein Aufziehen und Einlegen nicht abgekanteter Druckplatten in eine Druckende-Spannschiene mit einem hinreichend hohen Aufzugsmoment möglich ist.The object of the present invention is therefore a device for mounting printing plates on the plate cylinder of To improve printing machines according to the preamble of
Gelöst wird diese Aufgabe durch die Merkmale von Anspruch 1. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.This object is achieved by the features of
Nach der Erfindung ist vorgesehen, daß einer an sich bekannten Andrückrolle eine betätigbare Abkantleiste zugeordnet ist. Die Andrückrolle (an- und abstellbar) preßt während des langsamen Vorwärtsdrehens des Plattenzylinders beim Aufziehen einer neuen Druckplatte diese an den Außenumfang des Plattenzylinders. Wenn die Andrückrolle mit dem Bereich des Druckendes des Plattenzylinders korrespondiert folgt ein Stoppen der Vorwärtsdrehung. Die Abkantleiste wird nun betätigt, so daß die Druckplatte über die gesamte Formatbreite um die jenseits des Druckendes gelegene Abkantung des Plattenzylinders gebogen und mit ihrer Endkante auf einem Anschlag der hinteren Spannschiene zum Liegen kommt. Durch die geöffnete Spannschiene kann nun das nachlaufende Ende der Druckplatte gefaßt werden, was beispielsweise durch Schließen einer geöffneten Klemmklappe, durch Vorwärtsbewegen einer in Umfangsrichtung verstellbaren oder durch Vorschwenken einer entsprechend gelagerten Spannschiene erfolgen kann.According to the invention it is provided that an actuatable folding bar is assigned to a known pressure roller. The pressure roller (adjustable and removable) presses a new printing plate against the outer circumference of the plate cylinder during the slow forward rotation of the plate cylinder. When the pinch roller corresponds to the area of the printing end of the plate cylinder, the forward rotation stops. The folding bar is now actuated so that the printing plate is bent over the entire format width around the edge of the plate cylinder located beyond the printing end and comes to rest with its end edge on a stop of the rear tensioning rail. The trailing end of the pressure plate can now be gripped by the opened tensioning rail, which can be done, for example, by closing an open clamping flap, by moving a circumferentially adjustable tensioning rail or by swiveling forward an appropriately mounted tensioning rail.
Der gesamte Aufziehvorgang für eine neue Druckplatte erfolgt bei von dem Plattenzylinder abgestellten Gummituchzylinder. Das gesamte Aufzugsmoment für die neue Druckplatte wird somit ausschließlich durch die Andrückrolle bewirkt, die beispielsweise einen Gummiüberzug aufweist.The entire mounting process for a new printing plate takes place with the blanket cylinder parked by the plate cylinder. The entire elevator torque for the new pressure plate is thus caused exclusively by the pressure roller, which has a rubber coating, for example.
Durch die sich ebenfalls wie die Andrückrolle über die Formatbreite der Druckplatte erstreckende und betätigbare Abkantleiste erfolgt also ein Abkanten der Druckplatte während des Aufziehvorganges. Eine neue Druckplatte muß somit nicht vor dem Aufziehen mit einer speziellen Vorrichtung abgekantet werden. Da das Abkanten der Druckplatte auf dem Plattenzylinder erfolgt, wird den vorliegenden Umfangslängenverhältnissen des Plattenzylinders genau Rechnung getragen. Bereits gebrauchte Druckplatten können problemlos durch die erfindungsgemäße Vorrichtung aufgezogen werden.Due to the foldable strip, which, like the pressure roller, also extends and can be actuated across the format width of the printing plate, the printing plate is bent during the mounting process. A new pressure plate does not have to be opened with a special device. Since the bending of the printing plate takes place on the plate cylinder, the circumferential aspect ratios of the plate cylinder are taken into account precisely. Printing plates that have already been used can easily be mounted by the device according to the invention.
Die Vorrichtung zum Aufziehen von Druckplatten auf den Plattenzylinder von Druckmaschinen gemäß der Erfindung kann sowohl bei vollautomatischen Druckplattenwechselsystemen, wie in der Beschreibungseinleitung angeführt, als auch bei halbautomatischen Einrichtungen zum Druckplattenwechseln Anwendung finden. Bei Einrichtungen der letzteren Art sind keine Speicherkammern sowie Fördereinrichtungen für die neuen bzw. alten Druckplatten vorgesehen, sondern diese Vorgänge erfolgen von Hand. Bei derartigen Einrichtungen sind lediglich das Öffnen und Schließen der Spannschienen, das Spannen der Druckplatte über die Druckende-Spannschiene sowie die entsprechenden Positioniervorgänge des Plattenzylinders automatisch durchführbar.The device for mounting printing plates on the plate cylinder of printing machines according to the invention can be used both in fully automatic printing plate changing systems, as stated in the introduction, and in semi-automatic devices for changing printing plates. In devices of the latter type, there are no storage chambers or conveying devices for the new or old printing plates, but these processes are carried out by hand. With such devices, only the opening and closing of the tensioning rails, the tensioning of the printing plate via the printing end tensioning rail and the corresponding positioning processes of the plate cylinder can be carried out automatically.
Desweiteren erfolgt die Erläuterung eines Ausführungsbeispiels der Erfindung in Verbindung mit den folgenden Zeichnungen.Furthermore, an embodiment of the invention is explained in conjunction with the following drawings.
Es zeigt:
- Fig. 1 bis 4
- einen Plattenzylinder mit einer Andrückrolle in verschiedenen Stellungen während des Druckplattenaufziehens,
- Fig. 5
- eine Andrückrolle mit einer Abkantleiste nach der Erfindung,
- Fig. 6
- eine Betätigungseinrichtung für die erfindungsgemäße Abkantleiste,
- Fig. 7
- die Lagerung von Andrückrolle und Abkantleiste,
- Fig. 8
- eine Ausgestaltungsmöglichkeit für die Abkantleiste.
- 1 to 4
- a plate cylinder with a pressure roller in different positions during printing plate mounting,
- Fig. 5
- a pressure roller with a folding bar according to the invention,
- Fig. 6
- an actuating device for the folding bar according to the invention,
- Fig. 7
- the storage of pressure roller and folding bar,
- Fig. 8
- a design option for the folding bar.
In den Fig. 1 bis 4 ist jeweils ein Plattenzylinders 1 dargestellt, in dessen Zylindergrube 2 eine dem Druckanfang DA und dem Druckende DE zugeordnete vordere und hintere Spannschiene 3, 4 angeordnet ist. Die vordere Spannschiene 3 besteht, wie in den Fig. 1 bis 4 lediglich angedeutet, aus einer oberen und einer unteren Klemmschiene, wobei die untere Klemmschiene zum Öffnen bzw. Schließen eines für die Druckplatte 5 vorgesehenen Erfassungsbereiches gegenüber der oberen Klemmschiene bewegbar ist. Die hintere Spannschiene 4 besteht ebenfalls aus einer oberen und einer unteren Klemmschiene, wobei ebenfalls die untere Klemmschiene gegenüber der oberen beweglich ist und dadurch das Druckende einer Druckplatte zwischen diese Teile einführbar ist. Die hintere Spannschiene 4 ist ferner schwenkbar in der Zylindergrube 2 angeordnet, wobei die dargestellte Stellung einer ganz geöffneten Stellung der Spannschiene 4 entspricht. Durch ein Vorschwenken der Spannschiene 4 kann der Endbereich einer Druckplatte 5 in den Erfassungsbereich zwischen oberer und unterer Klemmleiste eingeführt, anschließend geklemmt und sodann durch Zurückschwenken unter Kraftaufwendung gespannt werden. Die hier dargestellten Ausbildungen der vorderen und der hinteren Spannschiene 3, 4 sind aber lediglich beispielhaft und können ebenfalls durch andere aus dem Stand der Technik bekannte Spannschienen ersetzt werden.1 to 4 each show a
Gemäß Fig. 1 befindet sich der Plattenzylinder 1 in einer Position, in welcher eine Druckplatte 5 in die geöffnete vordere Spannschiene 3 eingeführt werden kann. Eine sich über die Formatbreite des Plattenzylinders 1 erstreckende und beidseitig über Lagerhebel 7 verschwenkbar gelagerte Andrückrolle 6 wird nun aus einer gestrichelten Position in die angestellte Position verschwenkt. Es erfolgt ein langsames Vorwärtsdrehen des Plattenzylinders 1 (zuvor wurde die vordere Spannschiene 3 geschlossen).1, the
Die Andrückrolle 6 läuft nun über die Außenkontur der Spannschiene 3 ab und preßt nun während des Weiterdrehens die Druckplatte 5 gegen dessen Außenumfang (Fig. 2). Die Vorwärtsdrehung des Plattenzylinders 1 wird durch entsprechendes Ansteuern des Druckwerkantriebes solange fortgesetzt, bis die Andrückrolle 6 in einem Bereich des Druckendes DE des Plattenzylinders 1 zum Liegen kommt. Das nachlaufende Ende der aufgezogenen Druckplatte 5 steht somit nahezu in tangentialer Richtung ab (Fig. 3).The
In den Fig. 1 bis 4 ist oberhalb der Andrückrolle 6 (also in Drehrichtung des Plattenzylinders 1 dieser vorgeordnet) eine parallel zu deren Achse und ebenfalls sich über die Formatbreite des Plattenzylinders 1 erstreckende Abkantleiste 8 angeordnet, die durch eine noch weiter unten genauer beschriebene Lagerung sowie eine Betätigungseinrichtung aus einer Stellung gemäß den Figuren 1 bis 3 in eine Stellung zum Abkanten des nachlaufenden Endes der Druckplatte 5 (Fig. 4) bewegt werden kann. Die Anbringung und die Lagerung der Abkantleiste 8 gegenüber der Andrückrolle 6 bzw. deren Lagerhebel 7 ist dabei derart, daß die durch die Andrückrolle 6 im Bereich des Druckendes DE gehaltene Druckplatte 5 genau um eine jenseits des Druckendes DE gelegene Abkantung 9 des Plattenzylinders 1 gebogen wird (Fig. 5). Die hintere Kante der Druckplatte 5 kommt dabei in vorteilhafter Weise auf einer entsprechend gestalteten Anschlagfläche 10 der ganz geöffneten Spannschiene 4 - also in diesem Falle der ganz zurückgeschwenkten Spannschiene 4 - zum Liegen. Die Anschlagfläche 10 an der hinteren Spannschiene 4 erstreckt sich wie die Abkantleiste 8 über die gesamte Formatbreite des Plattenzylinders 1.1 to 4 is arranged above the pressure roller 6 (that is, upstream in the direction of rotation of the plate cylinder 1) a
In Fig. 5 ist die Lagerung der Andrückrolle 6 sowie der Abkantleiste 8 nebst deren im Einwirkbereich eine Krümmung aufweisendes Profil noch einmal genauer dargestellt (die diesbezüglichen Darstellungen in den Fig. 1 bis 4 sind nur prinzipiell zu verstehen). Die Andrückrolle 6 ist an beiden Seitengestellwänden 12 der Druckmaschine (nicht dargestellt) an je einem Ende je eines Lagerhebels 7 drehbar befestigt. Die gestellseitige Schwenkachse der Lagerhebel 7 kann beispielsweise durch eine Traverse 11 gebildet sein, an welcher auch der hier nicht dargestellte Einlaufschutz zwischen Plattenzylinder 1 und dem nicht dargestellten Gummituchzylinder angebracht ist (Fig. 5 und 7).In Fig. 5, the bearing of the
An den beiden schwenkbaren Enden der Lagerhebel 7 ist je ein Ende einer Achse 13 befestigt. Auf diese Achse 13 ist die Andrückrolle 6 drehbar gelagert. Die Andrückrolle 6 ist in vorteilhafter Weise in einzelne Abschnitte unterteilt, wobei jeder Abschnitt aus einer zylinderförmigen Hülse 14 besteht, die je über ein paar Radiallagern 15 (z.B. Nadellager) auf der Achse 13 gelagert sind. Die Hülsen 14 weisen beispielsweise einen gummiartigen Überzug auf, der einen Härtegrat von beispielsweise 50 Shore/A besitzt.One end of an
Durch die abschnittsweise Unterteilung der Andrückrolle 6 in einzelne Hülsen 14 erfolgt innerhalb eines gewissen Maßes ein Durchbiegungsausgleich der Andrückrolle 6 gegenüber dem Plattenzylinder 1. Ein Durchbiegungsausgleich der Andrückrolle 6 gerade bei großformatigen Maschinen kann in einfacher Weise auch durch eine entsprechend vorgebogene Achse 13 bei ebenfalls abschnittsweiser Unterteilung der Andrückrolle 6 erfolgen. Auch können weitere Maßnahmen für einen Durchbiegungsausgleich vorgesehen sein.The sectioning of the
In den beiden schwenkbaren Enden der Lagerhebel 7 ist oberhalb des Befestigungsbereiches der Achse 13 die Abkantleiste 8 über jeweils ein Langloch 16 sowie eine Schraube 17 beweglich bezüglich den Lagerhebeln 7 angebracht. Die Erstreckungsrichtung des Langloches 16 entspricht dabei der gemäß den Figuren 4, 5 vorgesehenen Beweglichkeit der Abkantleiste 8 gegenüber dem Plattenzylinder 1. Durch nicht dargestellte Federmittel kann die Abkantleiste 8 gegenüber den Lagerhebeln 7 stets in eine abgestellte Ausgangsstellung gedrückt werden. Diese Stellung entspricht den Positionen der Abkantleiste 8 in den Figuren 1 bis 3.In the two pivotable ends of the bearing levers 7, the
Damit auch die Abkantung der Druckplatte 5 durch die Abkantleiste 8 über die Formatbreite mit einer möglichst gleichmäßigen Kraft erfolgt, kann auch die Abkantleiste 8 für einen Durchbiegungsausgleich in Erstreckungsrichtung entsprechend vorgebogen bzw. mit ihrer Vorderkante entsprechend gewölbt ausgebildet sein. Zusätzlich kann die Abkantleiste 8 auch eine Durchbiegung verhindernde Profilierung aufweisen.So that the bending of the
An beiden Lagerhebeln 7 gemäß den Figuren 5 und 7 sind zum An- und Abstellen der Andrückrolle 6 die Kolbenstangen von beispielsweise doppelt wirkenden, mit Druckluft beaufschlagbaren Arbeitszylindern angelenkt. Die Andrückrolle 6 kann somit aus den jeweils in Fig. 1 und 5 gestrichelten Positionen (abgestellt) in die angestellte Position verschwenkt werden. Die Kraftverhältnisse der Arbeitszylinder sowie die Hebelverhältnisse der Anlenkung an den Lagerhebeln 7 ist dabei derart, daß die Andrückrolle 6 die gewünschte Anpreßkraft der Druckplatte 5 gegenüber dem Plattenzylinder 1 erfährt. Damit die Andrückrolle 6 beim Anstellen nicht in die Zylindergrube 2 des Plattenzylinders 1 eintaucht (Stellung des Plattenzylinders 1 wie in Fig. 1) können an den Lagerhebeln 7 Anschläge vorgesehen sein, die sich an den Schmitzringen des Plattenzylinders 1 (nicht dargestellt) abstützen. Zur Vermeidung einer Beschädigung der Oberflächen der Schmitzringe können an den Lagerhebeln 7 entsprechende Anschläge mit z.B. Polyamid vorgesehen sein.On both bearing
In den Fig. 6 und 7 ist die Betätigungseinrichtung 18 der Abkantleiste 8 dargestellt. An beiden Seitengestellwänden 12 ist je ein doppelt wirkender, mit Druckluft beaufschlagbarer Arbeitszylinder 19 angeordnet, dessen Kolbenstange an jeweils einen Arm eines winkelig ausgeführten Doppelhebels 20 angelenkt ist. An beiden Gestellseitenwänden 12 sind die Doppelhebel 20 um je einen Gelenkbolzen 21 schwenkbar gelagert. Die freien Enden der Doppelhebel 20 weisen jeweils eine Laufrolle 22 auf, über welche die Doppelhebel 20 auf die Abkantleiste 8 einwirken können. Die Winkelgebung der Doppelhebel 20 sowie die Anbringung der Gelenkbolzen 21 ist dabei derartig gewählt, so daß die Abkantleiste 8 bei angestellter Andrückrolle 6 beim Schalten der Arbeitszylinder 19 über die Laufrollen 22 aus der Ausgangsstellung (Federkraft) in die zum Abkanten der Druckplatte 5 vorgesehene Stellung vorverschoben wird (Fig. 5 und 6). Beim entsprechenden Rückschalten der Arbeitszylinder 19 langt die Abkantleiste 8 wieder in ihre Ausgangsstellung. Der Doppelhebel 20 ist dabei um einen derartigen Winkelbetrag zurückgeschwenkt, daß die Abkantleiste 8 beim Abstellen der Andrückrolle 6 durch die Laufrolle 22 keine Behinderung erfährt (die Grundstellung des Doppelhebels 20 ist in Fig. 6 gestrichelt eingezeichnet).6 and 7, the
Fig. 8 zeigt eine besonders vorteilhafte Profilgebung für die erfindungsgemäße Abkantleiste. Die Abkantleiste 8 hat hier das bogenförmige Profil eines Rohrabschnittes, welches um die Achse 13 der Andrückrolle 6 um einen bestimmten Winkelbetrag (Pfeil) drehbar gelagert ist. Durch dieses Profil kann die Abkantleiste 8 (ihr auf die Druckplatte 5 einwirkendes Ende) sehr nahe an der Andrückrolle 6 angebracht sein und weist ferner eine sehr hohe Durchbiegungssteifigkeit auf. Eine derartig ausgestaltete Abkantleiste 8 ist über nicht dargestellte Arme wenigstens an ihren Enden drehbar um die Achse 13 gelagert und wird wie zuvorstehend angedeutet im angeschwenkten Zustand der Andrückrolle 6 über die Doppelhebel 20 betätigt. Ein weiterer Vorteil einer derartigen Profilierung ist die Schutzfunktion für die Andrückrolle 6, wenn die Abkantleiste zurückgeschwenkt ist.8 shows a particularly advantageous profile for the folding strip according to the invention. The
Die in Fig. 8 im Profil dargestellte Abkantleiste 8 kann über mehr als zwei an den Enden angebrachte Arme drehbar um die Achse 13 gelagert sein, wobei diese jeweils im Bereich der axial voneinander beabstandeten Hülsen 14 der Andrückrolle 6 zur Achse 13 hindurchgeführt sind (vgl. Fig. 7). Eine derartige mehrfache Lagerung der Abkantleiste 8 bezüglich der Achse 13 ergibt eine Verstärkung der Biegesteifigkeit der Andrückrolle 6.The
- 11
- PlattenzylinderPlate cylinder
- 22nd
- ZylindergrubeCylinder pit
- 33rd
- Spannschiene (Druckanfang)Tensioning rail (start of printing)
- 44th
- Spannschiene (Druckende)Tensioning rail (printing end)
- 55
- Druckplatteprinting plate
- 66
- AndrückrollePressure roller
- 77
- LagerhebelBearing lever
- 88th
- AbkantleisteFolding bar
- 99
- Abkantung (Plattenzylinder 1)Bending (plate cylinder 1)
- 1010th
- Anschlagfläche (Spannschiene 4)Stop surface (clamping rail 4)
- 1111
- Traverse (Einlaufschutz)Traverse (entry protection)
- 1212th
- SeitengestellwandSide frame wall
- 1313
- Achseaxis
- 1414
- HülseSleeve
- 1515
- RadiallagerRadial bearing
- 1616
- LanglochLong hole
- 1717th
- Schraubescrew
- 1818th
- BetätigungseinrichtungActuator
- 1919th
- ArbeitszylinderWorking cylinder
- 2020th
- DoppelhebelDouble lever
- 2121
- GelenkbolzenHinge pin
- 2222
- LaufrolleRoller
- DATHERE
- DruckanfangStart of printing
- DEDE
- DruckendeEnd of printing
Claims (14)
- Device for applying a printing plate (5) to the plate cylinder (1) of a printing press, particularly a sheet offset printing press, in which a printing plate (5) fixable with the print start region (DA) against a tensioning rail arranged in the cylinder channel (2) of the plate cylinder (1) with the plate cylinder (1) turning forwards can be drawn by a pressing-on roller (6) which can be set against this around the exterior periphery of the plate cylinder (1) and thereafter the trailing end of the printing plate (5) can be fed for fixing this to a tensioning rail arranged relative to the print end (DE), characterised in that in the direction of rotation of the plate cylinder (1) arranged before the pressing-on roller (6) is a bending off bar (8) extending parallel thereto, which can be set via an actuation device (18) against the plate cylinder (1) when it has been brought into a given angular position so that the printing plate (5) is bendable around a chamfer (9) at the print end (DE) of the plate cylinder (1).
- Device according to Claim 1, characterised in that the bending off bar (8) is set movably on the swivellable ends of bearing lever (7) carrying on both sides the pressing-on roller (6) transverse to its direction of extension.
- Device according to Claim 2, characterised in that the actuation device (18) is installed fixed to the frame and is constructed thereto so that it can only be brought to act on the bending off bar (8) with the pressing-on roller (6) set on.
- Device according to Claim 3, characterised in that on both of the side frame walls (12) carrying the plate cylinder (1) is arranged in each case an actuation unit (18) by means of which in each case action can be applied to one end of the bending off bar (8).
- Device according to Claim 2, 3 or 4, characterised in that the actuation device (18) has a working cylinder (19) supported fixed with respect to the press which acts on one arm of a double lever (20) mounted about an axle fixed to the frame and that the bending off bar (8) is actuatable by the free arm of the double lever (20).
- Device according to Claim 5, characterised in that against the free arm of double lever (20) there is installed a running roller (22) acting on the bending off bar (8).
- Device according to one of the preceding claims, characterised in that the bending off bar (8) with the shape acting on the printing plate (5) as well as the plate cylinder (1) has an arched contour.
- Device according to Claim 2, characterised in that the bending off bar (8) has slots (16) at both ends via which it is applied by means of screws (17) movably against the bearing levers (7) of the pressing-on roller (6).
- Device according to Claim 4, 5 or 6, characterised in that the bending off bar (8) is constructed either by its cross-sectional profile and/or by being shaped in its direction of extension to compensate for overall bending.
- Device according to one of the preceding Claims, characterised in that the bending off bar (8) has an arcuate shape of a section of a tube and is mounted rotatably around the pressing-on roller (6).
- Device according to Claim 10, characterised in that the bending off bar (8) is supported via at least two bearings separated from one another in the direction of extension of the bending off bar (8) rotatably on the axle (13) of the pressing-on roller (6).
- Device according to one of the preceding Claims, characterised in that the pressing-on roller (6) is divided into several sections which are in the shape of individual shells (14) drawn via in each case a pair of radial bearings (15) on to an axle (13) running between both of the swivellable ends of both bearing levers (7).
- Device according to Claim 12, characterised in that the axle (13) for overall bending compensation has a convex curvature directed in the direction of the plate cylinder (1).
- Device according to one of the preceding Claims, characterised in that on the tensioning rail (4) arranged at the print end (DE) there is set a support surface (10) on which the end of the printing plate (5) bent around the chamfer (9) can be supported.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4214207 | 1992-04-30 | ||
| DE4214207A DE4214207C1 (en) | 1992-04-30 | 1992-04-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0567746A1 EP0567746A1 (en) | 1993-11-03 |
| EP0567746B1 true EP0567746B1 (en) | 1995-09-20 |
Family
ID=6457809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93103813A Expired - Lifetime EP0567746B1 (en) | 1992-04-30 | 1993-03-10 | Device for attaching printing plates on the plate cylinder of a printing press, particularly an offset sheet printing press |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5309835A (en) |
| EP (1) | EP0567746B1 (en) |
| JP (1) | JP2956021B2 (en) |
| AT (1) | ATE128073T1 (en) |
| DE (2) | DE4214207C1 (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6230816A (en) * | 1985-07-31 | 1987-02-09 | Japan Steel Works Ltd:The | Manufacturing method of martensitic stainless steel with excellent stress corrosion cracking resistance |
| DE4339344C1 (en) * | 1993-11-18 | 1995-03-30 | Roland Man Druckmasch | Device for the automated exchange of printing plates in a printing machine |
| DE4420971C1 (en) | 1994-06-16 | 1995-07-20 | Roland Man Druckmasch | Pulling method for flexible printing block onto press cylinder |
| DE4438754C2 (en) * | 1994-10-29 | 1998-02-19 | Roland Man Druckmasch | Suspension for a pressing element which can be set on and off a cylinder of a printing press |
| DE19505630A1 (en) * | 1995-02-18 | 1996-08-22 | Roland Man Druckmasch | Device for changing printing plates |
| DE19511075A1 (en) * | 1995-03-25 | 1996-09-26 | Roland Man Druckmasch | Method and device for mounting flexible printing forms |
| US6113346A (en) | 1996-07-31 | 2000-09-05 | Agfa Corporation | Method for loading and unloading a supply of plates in an automated plate handler |
| JP3059112B2 (en) * | 1997-01-13 | 2000-07-04 | リョービ株式会社 | Plate edge insertion device for printing press |
| JPH1120131A (en) * | 1997-07-03 | 1999-01-26 | Ryobi Ltd | Press plate gripper for printer |
| JP4037013B2 (en) * | 1998-09-28 | 2008-01-23 | 富士フイルム株式会社 | Plate material installation method |
| DE19950605A1 (en) * | 1999-10-21 | 2001-04-26 | Heidelberger Druckmasch Ag | Blanket with register recesses and blanket alignment method |
| DE10051367B4 (en) * | 1999-11-09 | 2012-10-04 | Heidelberger Druckmaschinen Ag | folding device |
| JP2001260320A (en) * | 2000-03-14 | 2001-09-25 | Fuji Photo Film Co Ltd | Method and device for fitting flexible printing plate |
| US6792860B2 (en) * | 2000-05-17 | 2004-09-21 | Koenig & Bauer Aktiengesellschaft | Method and device for pressing a packing against a cylinder |
| DE10219073A1 (en) * | 2001-05-23 | 2002-11-28 | Heidelberger Druckmasch Ag | Fastening a printing plate at a plate cylinder, of a rotary offset printing press, pushes one end of the plate into a narrow clamping gap to be bent over, and the other plate end is pushed into the gap to be locked by the first end |
| US6900826B2 (en) * | 2002-02-19 | 2005-05-31 | Presstek, Inc. | Multiple resolution helical imaging system and method |
| DE10306492B4 (en) * | 2002-03-21 | 2006-10-19 | Heidelberger Druckmaschinen Ag | Pressing device of a printing or varnishing machine |
| DE10338374A1 (en) * | 2003-08-21 | 2005-03-17 | Koenig & Bauer Ag | Printing plate guide device for printing plate changer has clamping gap shaped to produce required geometry of rear edge |
| JP4800148B2 (en) * | 2006-08-11 | 2011-10-26 | 三菱重工印刷紙工機械株式会社 | Plate changer |
| DE102017201161B4 (en) | 2017-01-25 | 2024-03-14 | Koenig & Bauer Ag | Method for mounting a plate onto a cylinder of a printing press and a device for mounting a plate in a printing press |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62169646A (en) * | 1986-01-22 | 1987-07-25 | Mitsubishi Heavy Ind Ltd | Apparatus for inserting tail side end part of plate in plate cylinder of printing press |
| JP2726661B2 (en) * | 1986-09-18 | 1998-03-11 | 三菱重工業株式会社 | Plate insertion device for sheet-fed printing press |
| JPH07110538B2 (en) * | 1987-11-12 | 1995-11-29 | 三菱重工業株式会社 | Plate automatic attachment / detachment device |
| ATE150374T1 (en) * | 1989-08-04 | 1997-04-15 | Komori Printing Mach | PLATE FASTENING DEVICE FOR A SHEET-FEED PRESS |
| EP0431575B1 (en) * | 1989-12-06 | 1995-10-04 | Komori Corporation | Plate mounting apparatus for printing press |
| DE3940796A1 (en) * | 1989-12-09 | 1991-06-13 | Koenig & Bauer Ag | METHOD AND DEVICE FOR AUTOMATICALLY CHANGING A PRINT PLATE |
| DE3940795A1 (en) * | 1989-12-09 | 1991-06-13 | Koenig & Bauer Ag | METHOD AND DEVICE FOR AUTOMATIC FEEDING OR REMOVING A PRINT PLATE |
| JP2844539B2 (en) * | 1989-12-15 | 1999-01-06 | 株式会社小森コーポレーション | Plate holding device for printing press |
| JPH0577401A (en) * | 1991-09-19 | 1993-03-30 | Akiyama Insatsuki Seizo Kk | Printing plate mounting/dismounting device of printer |
-
1992
- 1992-04-30 DE DE4214207A patent/DE4214207C1/de not_active Expired - Fee Related
-
1993
- 1993-03-10 DE DE59300614T patent/DE59300614D1/en not_active Expired - Lifetime
- 1993-03-10 EP EP93103813A patent/EP0567746B1/en not_active Expired - Lifetime
- 1993-03-10 AT AT93103813T patent/ATE128073T1/en not_active IP Right Cessation
- 1993-04-28 JP JP5102487A patent/JP2956021B2/en not_active Expired - Fee Related
- 1993-04-30 US US08/056,026 patent/US5309835A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE128073T1 (en) | 1995-10-15 |
| DE4214207C1 (en) | 1993-07-22 |
| EP0567746A1 (en) | 1993-11-03 |
| US5309835A (en) | 1994-05-10 |
| JP2956021B2 (en) | 1999-10-04 |
| JPH0623953A (en) | 1994-02-01 |
| DE59300614D1 (en) | 1995-10-26 |
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