EP0678383B1 - Device for exchanging printing plates in a rotary printing machine - Google Patents

Device for exchanging printing plates in a rotary printing machine Download PDF

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Publication number
EP0678383B1
EP0678383B1 EP95102223A EP95102223A EP0678383B1 EP 0678383 B1 EP0678383 B1 EP 0678383B1 EP 95102223 A EP95102223 A EP 95102223A EP 95102223 A EP95102223 A EP 95102223A EP 0678383 B1 EP0678383 B1 EP 0678383B1
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EP
European Patent Office
Prior art keywords
printing
printing form
forme
cylinder
slope
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
Application number
EP95102223A
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German (de)
French (fr)
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EP0678383A1 (en
Inventor
Jean-Claude Marmin
Jacky Planas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Goss International Montataire SA
Original Assignee
Heidelberger Druckmaschinen AG
Heidelberg Harris SA
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Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG, Heidelberg Harris SA filed Critical Heidelberger Druckmaschinen AG
Publication of EP0678383A1 publication Critical patent/EP0678383A1/en
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Publication of EP0678383B1 publication Critical patent/EP0678383B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1206—Feeding to or removing from the forme cylinder

Definitions

  • the invention relates to a device for changing Printing forms on rotary printing machines, which Printing form cylinders comprise the two ends of one Take up printing form in a channel, the surface of the Printing form is wound around the printing form cylinder; With one currently on the printing form cylinder Printing form receiving device after the printing form of the clamping devices of the printing form cylinder is released and a device for supplying a new printing form to the Printing form cylinder.
  • EP 0 433 798 A2 discloses a method and a device for automatic feeding or removal of a printing plate.
  • this device there is both a storage area for a printing form to be fed is provided, as well as a Storage area in which one from the printing form cylinder Removing printing form can retract before the new Printing form is attached to the printing form cylinder.
  • Transport and pressure rollers are provided to ensure an accurate To ensure insertion of the leading edge of the printing form; either the new one to be introduced as well as that from the printing unit removing printing form will, however, become larger Section of your transport route over stationary surfaces moved, causing scratching of the sensitive surfaces both the one to be fed and the one to be removed Printing form cannot be completely excluded.
  • EP 0 432 660 A2 discloses a method for automatically changing one Printing plate.
  • the device implemented to carry out this method are a number between the storage areas for the printing forms Transport rollers stored.
  • Transport rollers Between transport rollers and the surface of the Printing forme cylinder or the wide channel of the printing form cylinder are one Lever mechanism and adjustable tongues arranged, which on the one hand a considerable represent mechanical effort and on the other hand the accessibility of the Not negligibly affect the printing unit of the rotary printing press.
  • EP 0 570 702 A1 shows a device for feeding printing plates onto the Plate cylinders of printing machines, in particular sheetfed offset printing machines.
  • an angle plate can be actuated by a pneumatic cylinder, the has a sheet metal profile with brushes. Thereby can insert a new pressure plate directly into a clamping rail of a printing form cylinder are introduced.
  • JP-A-05 000503 relates to the application of a plate material to one Cylinder.
  • a front end of a plate material is inserted into a recess in a Cylinder inserted, while during the winding of the plate material on the Circumference of the cylinder a film covering the back of the plate material is withdrawn, the winding movement of the plate material by a a movable carriage rotatably supported pressure roller is supported.
  • EP 0 431 715 A2 describes a plate changing device for Printing machines became known. This is on sheet-fed rotary printing machines related device includes both a memory area for a new one to be fed printing form as well as for those released by the printing form cylinder Printing forms.
  • the object of the invention based on a reliable feeding and removal of printing forms to one Ensure printing form cylinder.
  • An advantage of the idea on which the invention is based is the fact that the elasticity of the thin printing plates to insert each Printing form front edge used in a narrow channel of printing form cylinders can be; after removing the previously on the circumference of the printing form cylinder
  • the printing form can be used to pull in the new printing form required reversal of the direction of rotation of the printing form cylinder the front edge of the Snap the new printing form into the channel of the printing form cylinder.
  • the for Snapping the leading edge of the printing form into the channel is required by the pivoting holding means applied, which in a the employment of Printing form leading edge position are positionable.
  • the holding means allow the printing forme to be drawn in continuously while it is in motion hold this in the front part of the lead-in chamfer away from this one To avoid damage.
  • the continuous application of negative pressure to the Holding means is consistently during the pulling-in movement of the new printing form guaranteed.
  • the holding means in one by one Arrange swivel axis pivotable level, whereby uniform application of an area of the printing form this is achieved.
  • the level is controllable Actuators movable, for example actuating cylinders loaded with pressure medium can be used.
  • the pivotable plane in which the holding means are arranged, is located above the lead-in slope.
  • the holding means are under pressure, for example, what allows a light and even vacuum supply, there is a pneumatic system in the printing unit area anyway is available.
  • Both the device supplying a printing form and the printing form to be removed from the printing form cylinder receiving device are designed as slopes.
  • the Delivery levels for the printing forms inclined in these arranged bevels can be rotated by peripheral surfaces stored rotating body formed. It turned out to be very proven advantageous that the printing form to be fed in the Entry slope in a substantially upright position is recordable.
  • a printing form cylinder 1 is an insertion bevel 2 as well an extension slope 3 assigned.
  • the lead-in chamfer 2 as well the draft bevel 3 are by a variety in one Level mounted loosely rotatable rollers formed so that the pressure forms A or B to be deposited thereon are low-friction Experience funding.
  • Above the chamfer 2 is a Actuating cylinder pair 4, 5 shown which holding means 9 by one Axis 8 pivots. Instead of actuating cylinders 4, 5 point also compact electromotive drive means conceivable, with which the printing form leading edge exactly to that Time can be introduced into the channel 11 at which this opposite the angled end of the printing form front edge lies.
  • a state to be newly introduced Printing form B which has a leading edge 28 'and a trailing edge 29 '.
  • a Adjusting cylinder 6 arranged, which a holding means 10 in different positions within the extension slope 3 emotional.
  • Bracket 16 arranged in which the front edge of one of the Printing form cylinder 1 to be removed from printing form A. can be.
  • the front edge 28 or their rear edge 29 are together in a channel 11 added, which is executed in the printing form cylinder 1.
  • the outer surface of the printing form cylinder 1 also works a pressure roller 17 together, and the one arranged underneath, Transfer cylinder 40 not shown.
  • Fig. 2 shows a front view of the invention Facility.
  • a printing press cylinder are a printing form cylinder 1 and a transfer cylinder 40 rotatably mounted. Further a pressure roller 17 is assigned to a printing form cylinder 1.
  • a pair of actuating cylinders 4, 5 is located on one of the side walls attached, which is an axis 8, which is both a Guide slope 7, as well as the level in which the Holding means 9 are arranged, pivoted.
  • the holding element 82 has a lateral stop 81.
  • Both Actuators 80 and 84 can be electromagnetic actuated units or pneumatic cylinders that act on the air supply to the rotary printing press can be connected are.
  • Fig. 3 shows an enlarged view of a new to be applied printing form B fixing holding elements.
  • the holding elements 82 and 83 are as elbows trained, being of a cylindrical Actuator 84 can be moved.
  • a holding element, in in this case the holding element 82 has a lateral one Stop 81 to the new printing form B align correctly sideways before feeding into the printing unit.
  • the new one is at rest Printing form B on the in the chamfer 2 on the Holding elements 82 and 83.
  • the actuating cylinder pair 4, 5 holds the Holding means 9 in a pivoted position.
  • the actuators for the new printing form B, which are in the lead-in slope 2, are still in Quiet.
  • the front area of the new printing form B is juxtaposed the outer surface of the printing form cylinder 1. This will make the Front edge 28 'of the new printing form B from the channel 11 of the Printing form cylinder 1 gripped, which marks the beginning of Feeding movement of the new printing form B adjusts. Since the Holding means 9 in the plane pivotable about the axis 8 are continuously subjected to negative pressure, can during the retraction movement of the new printing form B this in a Incoming movement favoring position are held. The Fixing the not yet on the jacket of the Printing form cylinder 1 section of the new Printing form takes place exclusively through the holding means 9.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Rotary Presses (AREA)
  • Printers Characterized By Their Purpose (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Discharge By Other Means (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Abstract

The device has a reception system (3) receiving the previously employed printing form (A), after releasing its opposing ends from the clamping groove (11) in the surface of the printing cylinder (1) and a delivery system (2) for supplying the new printing form (B) to the printing cylinder. Pivoted retaining devices (9) temporarily acts against part of the new printing form, causing it to be deformed for fitting its leading end into the clamping groove in the printing cylinder. Pref the pivot plane (7) of the retaining devices is adjustable via remote-controlled setting devices (4, 5). <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Wechsel von Druckformen an Rotationsdruckmaschinen, welche Druckformzylinder umfassen, die die beiden Enden einer Druckform in einem Kanal aufnehmen, wobei die Oberfläche der Druckform um den Druckformzylinder herum gewunden ist; mit einer eine derzeit auf dem Druckformzylinder befindliche Druckform aufnehmenden Einrichtung, nachdem die Druckform von den Spanneinrichtungen des Druckformzylinders freigegeben ist und einer Einrichtung zur Zufuhr einer neuen Druckform zu dem Druckformzylinder.The invention relates to a device for changing Printing forms on rotary printing machines, which Printing form cylinders comprise the two ends of one Take up printing form in a channel, the surface of the Printing form is wound around the printing form cylinder; With one currently on the printing form cylinder Printing form receiving device after the printing form of the clamping devices of the printing form cylinder is released and a device for supplying a new printing form to the Printing form cylinder.

EP 0 433 798 A2 offenbart ein Verfahren und eine Einrichtung zum automatischen Zuführen bzw. Abführen einer Druckplatte. Bei dieser Vorrichtung ist sowohl ein Speicherbereich für eine zuzuführende Druckform vorgesehen, als auch ein Speicherbereich, in den eine vom Druckformzylinder zu entfernende Druckform einfahren kann, bevor die neue Druckform am Druckformzylinder befestigt wird. Unmittelbar in der Nähe des die Druckformen aufnehmenden Zylinders sind zwar Transport- und Andrückrollen vorgesehen, um ein genaues Einführen der Druckformvorderkante zu gewährleisten; sowohl die neu einzuführende als auch die aus dem Druckwerk zu entfernende Druckform werden jedoch Ober einen größeren Abschnitt ihres Transportweges über ruhende Oberflächen bewegt, so daß ein Verkratzen der empfindlichen Oberflächen sowohl bei der zuzuführenden wie auch bei der zu entfernenden Druckform nicht völlig ausgeschlossen werden kann. EP 0 433 798 A2 discloses a method and a device for automatic feeding or removal of a printing plate. In this device there is both a storage area for a printing form to be fed is provided, as well as a Storage area in which one from the printing form cylinder Removing printing form can retract before the new Printing form is attached to the printing form cylinder. Immediately in are close to the cylinder receiving the printing plates Transport and pressure rollers are provided to ensure an accurate To ensure insertion of the leading edge of the printing form; either the new one to be introduced as well as that from the printing unit removing printing form will, however, become larger Section of your transport route over stationary surfaces moved, causing scratching of the sensitive surfaces both the one to be fed and the one to be removed Printing form cannot be completely excluded.

EP 0 432 660 A2 offenbart ein Verfahren zum automatischen Wechseln einer Druckplatte. Bei der zur Durchführung dieses Verfahrens verwirklichten Vorrichtung sind zwischen den Speicherbereichen für die Druckformen eine Anzahl Transportrollen gelagert. Zwischen Transportrollen und der Oberfläche des Druckformzylinders bzw. des breiten Kanals des Druckformzylinders sind ein Hebelwerk und verstellbare Zungen angeordnet, welche einerseits einen erheblichen mechanischen Aufwand darstellen und andererseits die Zugänglichkeit des Druckwerkes der Rotationsdruckmaschine nicht unerheblich beeinträchtigen.EP 0 432 660 A2 discloses a method for automatically changing one Printing plate. In the device implemented to carry out this method are a number between the storage areas for the printing forms Transport rollers stored. Between transport rollers and the surface of the Printing forme cylinder or the wide channel of the printing form cylinder are one Lever mechanism and adjustable tongues arranged, which on the one hand a considerable represent mechanical effort and on the other hand the accessibility of the Not negligibly affect the printing unit of the rotary printing press.

EP 0 570 702 A1 zeigt eine Vorrichtung zum Zuführen von Druckplatten auf den Plattenzylinder von Druckmaschinen, insbesondere Bogenoffsetdruckmaschinen. Bei dieser Vorrichtung ist ein Winkelblech durch einen Pneumatikzylinder betätigbar, der ein Blechprofil mit Bürsten aufweist. Dadurch kann eine neue Druckplatte direkt in eine Spannschiene eines Druckformzylinders eingeführt werden.EP 0 570 702 A1 shows a device for feeding printing plates onto the Plate cylinders of printing machines, in particular sheetfed offset printing machines. At this device, an angle plate can be actuated by a pneumatic cylinder, the has a sheet metal profile with brushes. Thereby can insert a new pressure plate directly into a clamping rail of a printing form cylinder are introduced.

JP-A-05 000503 bezieht sich auf das Aufbringen eines Plattenmaterials auf einen Zylinder. Ein vorderes Ende eines Plattenmaterials wird in eine Vertiefung eines Zylinders eingelassen, wobei während des Aufwicklens des Plattenmaterials auf den Umfang des Zylinders eine die Rückseite des Plattenmaterials bedeckende Folie abgezogen wird, wobei die Aufwickelbewegung des Plattenmaterials durch eine auf einem bewegbaren Schlitten drehbar aufgenommene Andrückrolle unterstützt wird.JP-A-05 000503 relates to the application of a plate material to one Cylinder. A front end of a plate material is inserted into a recess in a Cylinder inserted, while during the winding of the plate material on the Circumference of the cylinder a film covering the back of the plate material is withdrawn, the winding movement of the plate material by a a movable carriage rotatably supported pressure roller is supported.

Schließlich ist aus EP 0 431 715 A2 eine Plattenwechselvorrichtung für Druckmaschinen bekannt geworden. Diese sich auf Bogenrotationsdruckmaschinen beziehende Vorrichtung umfaßt sowohl einen Speicherbereich für eine neu zuzuführende Druckform als auch für die vom Druckformzylinder freigegebenen Druckformen. Finally, EP 0 431 715 A2 describes a plate changing device for Printing machines became known. This is on sheet-fed rotary printing machines related device includes both a memory area for a new one to be fed printing form as well as for those released by the printing form cylinder Printing forms.

Mehrere Druckformen sind in einer zwischen den in Reihenbauweise angeordneten Druckwerken einer Bogenrotationsmaschine schwenkbar gelagerten Kassette aufgenommen. In der Kassette sind mehrere L-förmige Haken aufgenommen, mit denen die einzelnen Druckformen in der Kassette fixierbar sind, so daß zur Speicherung der Druckformen in einer schwenkbaren Kassette ein erheblicher mechanischer Aufwand getrieben werden muß.Several printing forms are arranged in a row between those Printing units of a sheet-fed rotary cassette added. Several L-shaped hooks are included in the cassette which the individual printing forms can be fixed in the cassette, so that for Storage of the printing forms in a swiveling cassette is a considerable one mechanical effort must be driven.

Ausgehend vom skizzierten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein betriebssicheres Zuführen und Entfernen von Druckformen zu einem Druckformzylinder zu gewährleisten.Based on the outlined prior art, the object of the invention based on a reliable feeding and removal of printing forms to one Ensure printing form cylinder.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Patentanspruches 1 gelöst.According to the invention, this object is achieved by the features of patent claim 1 solved.

Von Vorteil bei dem der Erfindung zugrunde liegenden Gedanken ist der Umstand, daß die Elastizität der dünnen Druckformen zum Einführen der jeweiligen Druckformvorderkante in einen schmalen Kanal von Druckformzylindern ausgenutzt werden kann; nach Entfernung der vorher auf dem Umfang des Druckformzylinders befindlichen Druckform kann nach der zum Einziehen der neuen Druckform erforderlichen Drehrichtungsumkehr des Druckformzylinders die Vorderkante der neuen Druckform in den Kanal des Druckformzylinders einschnappen. Die zum Einschnappen der Druckformvorderkante in den Kanal erforderliche Kraft wird durch die schwenkbaren Haltemittel aufgebracht, die in einer die Anstellung der Druckformvorderkante erzeugenden Lage positionierbar sind.An advantage of the idea on which the invention is based is the fact that the elasticity of the thin printing plates to insert each Printing form front edge used in a narrow channel of printing form cylinders can be; after removing the previously on the circumference of the printing form cylinder The printing form can be used to pull in the new printing form required reversal of the direction of rotation of the printing form cylinder the front edge of the Snap the new printing form into the channel of the printing form cylinder. The for Snapping the leading edge of the printing form into the channel is required by the pivoting holding means applied, which in a the employment of Printing form leading edge position are positionable.

Die Haltemittel erlauben ein kontinuierliches Einziehen der Druckform, während sie diese im vorderen Teil der Einführschräge von dieser entfernt halten, um eine Beschädigung zu vermeiden. Die kontinuierliche Unterdruckbeaufschlagung der Haltemittel ist während der Einziehbewegung der neuen Druckform durchweg gewährleistet. The holding means allow the printing forme to be drawn in continuously while it is in motion hold this in the front part of the lead-in chamfer away from this one To avoid damage. The continuous application of negative pressure to the Holding means is consistently during the pulling-in movement of the new printing form guaranteed.

Weitere Ausgestaltungen des der Erfindung zugrunde liegenden Gedankens liegen darin, die Haltemittel in einer um eine Schwenkachse schwenkbaren Ebene verteilt anzuordnen, wodurch ein gleichmäßiges Anliegen eines Bereiches der Druckform an diesen erzielt wird. Ferner ist die Ebene mittels steuerbarer Stelleinheiten bewegbar, wozu beispielsweise druckmediumbeaufschlagte Stellzylinder einsetzbar sind. Die schwenkbare Ebene in der die Haltemittel angeordnet sind, befindet sich oberhalb der Einführschräge. Die Haltemittel sind beispielsweise unterdruckbeaufschlagt ausgeführt, was eine leichte und gleichmäßige Unterdruckversorgung erlaubt, da im Bereich der Druckwerke ohnehin ein Pneumatiksystem vorhanden ist.Further refinements of the basis of the invention The idea is that the holding means in one by one Arrange swivel axis pivotable level, whereby uniform application of an area of the printing form this is achieved. Furthermore, the level is controllable Actuators movable, for example actuating cylinders loaded with pressure medium can be used. The pivotable plane in which the holding means are arranged, is located above the lead-in slope. The holding means are under pressure, for example, what allows a light and even vacuum supply, there is a pneumatic system in the printing unit area anyway is available.

Sowohl die eine Druckform zuführenden Einrichtung als auch die die vom Druckformzylinder zu entfernende Druckform aufnehmende Einrichtung sind als Schrägen ausgebildet. Die Förderebenen für die Druckformen in diesen geneigt angeordneten Schrägen werden durch Umfangsflächen drehbar gelagerter Rotationskörper gebildet. Es hat sich als sehr vorteilhaft erwiesen, daß die zuzuführende Druckform in der Einführschräge in im wesentlichen aufrechter Position aufnehmbar ist.Both the device supplying a printing form and the printing form to be removed from the printing form cylinder receiving device are designed as slopes. The Delivery levels for the printing forms inclined in these arranged bevels can be rotated by peripheral surfaces stored rotating body formed. It turned out to be very proven advantageous that the printing form to be fed in the Entry slope in a substantially upright position is recordable.

In Weiterführung des der Erfindung zugrunde liegenden Gedankens sind unterhalb der Einführschräge im zur Mantelfläche des Druckformzylinders nächstliegenden Bereich horizontal bewegbare Haltelemente angeordnet. Diese fixieren die Vorderkante einer zuzuführenden Druckform temporär, d.h. solange, bis ein Bereich der zuzuführenden Druckform von den in einer schwenkbaren Ebene liegenden Haltemittel ergriffen wird. Die horizontal bewegbaren Halteelemente sind mit Stelleinheiten versehen, die die horizontale Bewegung bewirken. In continuation of the basis of the invention Thoughts are below the insertion slope in the Cladding surface of the area closest to the printing form cylinder horizontally movable holding elements arranged. Fix this the leading edge of a printing form to be fed temporarily, i.e. until an area of the printing form to be fed from the holding means located in a pivotable plane becomes. The horizontally movable holding elements are included Actuators provide the horizontal movement cause.

Darüber hinaus ist unterhalb der Ausschubschräge ein die zu entfernende Druckform ergreifendes in eine endgültige Entnahmeposition förderndes Haltemittel vorgesehen. Nach Erreichen der endgültigen Entnahmeposition ist die Druckform durch den Drucker sehr leicht entnehmbar. Zur Absicherung der endgültigen Entnahmeposition der zu entnehmenden Druckform in der Ausschubschräge ist unterhalb der Ausschubschräge mindestens ein Haltebügel vorgesehen.In addition, there is a below the extension slope removing printing form moving into a final one Retaining means promoting removal position provided. After The printing form is reached when the final removal position is reached easily removable by the printer. To secure the final removal position of the printing form to be removed in the extension slope is below the extension slope at least one bracket is provided.

Anhand einer Zeichnung wird die Erfindung nachstehend detalliert erläutert.The invention is illustrated below with the aid of a drawing detailed explained.

Es zeigen:

Fig. 1
die Seitenansicht eines Druckwerkzylinderpaares, wobei dem Druckformzylinder eine Einführschräge und eine Ausschubschräge mit pneumatischen Halteelementen zugeordnet ist,
Fig. 2
eine Vorderansicht der erfindungsgemäßen Plattenzu- und Abführvorrichtung,
Fig. 3
eine vergrößerte Darstellung der horizontal bewegbaren Halteelemente,
Fig. 4
den Beginn des Entfernens einer auf dem Druckformzylinder befindlichen Druckform,
Fig. 5
ein fortgeschrittenes Stadium des Entfernens der Druckform vom Druckformzylinder,
Fig. 6
das Ergreifen der Druckform durch ein unterhalb der Ausschubschräge angeordnetes Haltemittel,
Fig. 7
das Ablegen der entfernten Druckform in Haltebügel an der Ausschubschräge,
Fig. 8
das Ergreifen des vorderen Bereiches einer neu einzuführenden Druckform durch pneumatische Haltemittel,
Fig. 9
das Einhängen der Vorderkante der neu einzuführenden Druckform in den Kanal des Druckformzylinders und
Fig. 10
die Endphase des Einführvorganges der neu einzuführenden Druckform.
Show it:
Fig. 1
the side view of a pair of printing couple cylinders, with the printing form cylinder being assigned an insertion slope and an extension slope with pneumatic holding elements,
Fig. 2
a front view of the plate feed and discharge device according to the invention,
Fig. 3
an enlarged view of the horizontally movable holding elements,
Fig. 4
the beginning of the removal of a printing form located on the printing form cylinder,
Fig. 5
an advanced stage of removing the printing form from the printing form cylinder,
Fig. 6
gripping the printing form by means of a holding means arranged below the ejection slope,
Fig. 7
depositing the removed printing form in a bracket on the extension slope,
Fig. 8
gripping the front area of a newly introduced printing form by pneumatic holding means,
Fig. 9
the hanging of the front edge of the new printing form to be introduced into the channel of the printing form cylinder and
Fig. 10
the final phase of the insertion process of the new printing form to be introduced.

Einem Druckformzylinder 1 ist eine Einführschräge 2 sowie eine Ausschubschräge 3 zugeordnet. Die Einführschräge 2 sowie die Ausführschräge 3 werden durch eine Vielzahl in einer Ebene gelagerter lose drehbarer Rollen gebildet, so daß die darauf abzulegenden Durckformen A bzw. B eine reibungsarme Förderung erfahren. Oberhalb der Einführschräge 2 ist ein Stellzylinderpaar 4, 5 gezeigt, welches Haltemittel 9 um eine Achse 8 schwenkt. Anstelle von Stellzylindern 4, 5 weisen auch kompakt bauende elektromotorische Antriebsmittel denkbar, womit die Druckformvorderkante exakt zu dem Zeitpunkt in den Kanal 11 einführbar ist, zu dem dieser gegenüber dem abgewinkelten Ende der Druckformvorderkante liegt. Um die Achse 8 ist ferner eine Führungsschräge 7 schwenkbar angeordnet. Auf der Einführschräge 2 befindet sich in Fig. 1 dargestellten Zustand eine neu einzuführende Druckform B, die eine Vorderkante 28' sowie eine Hinterkante 29' aufweist. Unterhalb der Ausschubschräge 3 ist ein Stellzylinder 6 angeordnet, welcher ein Haltemittel 10 in verschiedenen Positionen innerhalb der Ausschubschräge 3 bewegt. Im vorderen Bereich der Ausschubschräge 3 sind Haltebügel 16 angeordnet, in welche die Vorderkante einer vom Druckformzylinder 1 zu entnehmenden Druckform A abgelegt werden kann. A printing form cylinder 1 is an insertion bevel 2 as well an extension slope 3 assigned. The lead-in chamfer 2 as well the draft bevel 3 are by a variety in one Level mounted loosely rotatable rollers formed so that the pressure forms A or B to be deposited thereon are low-friction Experience funding. Above the chamfer 2 is a Actuating cylinder pair 4, 5 shown which holding means 9 by one Axis 8 pivots. Instead of actuating cylinders 4, 5 point also compact electromotive drive means conceivable, with which the printing form leading edge exactly to that Time can be introduced into the channel 11 at which this opposite the angled end of the printing form front edge lies. There is also a guide bevel 7 about the axis 8 pivotally arranged. Located on the lead-in slope 2 1 shown a state to be newly introduced Printing form B, which has a leading edge 28 'and a trailing edge 29 '. Below the extension slope 3 is a Adjusting cylinder 6 arranged, which a holding means 10 in different positions within the extension slope 3 emotional. In the front area of the extension slope 3 Bracket 16 arranged in which the front edge of one of the Printing form cylinder 1 to be removed from printing form A. can be.

Auf den gezeigten Druckformzylinder 1 ist gegegenwärtig eine zu wechselnde Druckform A aufgenommen. Deren Vorderkante 28 bzw. deren Hinterkante 29 sind gemeinsam in einem Kanal 11 aufgenommen, welcher im Druckformzylinder 1 ausgeführt ist. Mit der Mantelfläche des Druckformzylinders 1 arbeitet ferner eine Anpreßwalze 17 zusammen, sowie der darunter angeordnete, nicht näher dargestellte Übertragungszylinder 40. Der Druckformzylinder 1 und der damit zusammenarbeitende nicht näher dargestellte Übertragungszylinder 40 bilden beispielsweise eine oberes Druckwerk in einer Rotationsdruckmaschine, welches oberhalb einer zu verarbeitenden Materialbahn angeordnet ist.On the printing form cylinder 1 shown there is currently one printing form A to be changed added. The front edge 28 or their rear edge 29 are together in a channel 11 added, which is executed in the printing form cylinder 1. The outer surface of the printing form cylinder 1 also works a pressure roller 17 together, and the one arranged underneath, Transfer cylinder 40 not shown. The Printing form cylinder 1 and the cooperating with it not Form transfer cylinder 40 shown in detail for example an upper printing unit in one Rotary printing press, which above one too processing material web is arranged.

Es sei noch bemerkt, daß die Einführschräge 2 an deren Unterseite durch schematisch angeordnete Haltestifte 82 und 83, die senkrecht zur Zeichenebene bewegbar sind, begrenzt wird.It should also be noted that the lead-in bevel 2 at their Bottom side by schematically arranged holding pins 82 and 83, which are movable perpendicular to the plane of the drawing, is limited.

Fig. 2 zeigt eine Vorderansicht der erfindungsgemäßen Einrichtung.Fig. 2 shows a front view of the invention Facility.

In den hier lediglich schematisch widergegebenen Seitenwänden einer Rotationsdruckmaschine sind ein Druckformzylinder 1 sowie ein Übertragungszylinder 40 drehbar gelagert. Ferner ist einem Druckformzylinder 1 eine Anpreßwalze 17 zugeordnet.In the side walls shown here only schematically a printing press cylinder are a printing form cylinder 1 and a transfer cylinder 40 rotatably mounted. Further a pressure roller 17 is assigned to a printing form cylinder 1.

An einer der Seitenwände ist ein Stellzylinderpaar 4, 5 befestigt, welches eine Achse 8, die sowohl eine Führungsschräge 7, als auch die Ebene aufnimmt, in der die Haltemittel 9 angeordnet sind, verschwenkt. In den schematisch angeordneten Seitenwänden sind ferner die Halteelemente 82 und 83 aufgenommen. Das Halteelement 82 weist einen seitlichen Anschlag 81 auf. Wie aus der Darstellung gemäß Fig. 2 hervorgeht, sind die Halteelemente 82 und 83 durch je eine Stelleinheit 80 und 84 in horizontaler Richtung bewegbar. Bei den Stelleinheiten 80 und 84 kann es sich um elektromagnetisch betätigte Einheiten oder um Pneumatikzylinder handeln, die an die Luftversorgung der Rotationsdruckmaschine anschließbar sind. Sind die Halteelemente 82 und 83 in ihre gestrichelte Position ausgefahren, ruht das vordere Ende der auf dem Druckformzylinder 1 zu befestigenden Druckform B auf diesem, durch den Seitenanschlag 81 korrekt seitlich ausgerichtet.A pair of actuating cylinders 4, 5 is located on one of the side walls attached, which is an axis 8, which is both a Guide slope 7, as well as the level in which the Holding means 9 are arranged, pivoted. In the schematically arranged side walls are also the Holding elements 82 and 83 added. The holding element 82 has a lateral stop 81. As from the 2 shows are the Holding elements 82 and 83 by an actuating unit 80 and 84 movable in the horizontal direction. Both Actuators 80 and 84 can be electromagnetic actuated units or pneumatic cylinders that act on the air supply to the rotary printing press can be connected are. Are the holding elements 82 and 83 in their dashed lines Extended position, the front end rests on the Printing form cylinder 1, printing form B to be fastened on this, correctly aligned laterally by the side stop 81.

Aus der Darstellung gemäß Fig. 2 geht überdies hervor, daß die die Haltemittel 10 betätigenden Stellzylinder unterhalb der Ausschubschräge 3 angeordnet sind und die Haltemittel 10 an stangenförmigen Verlängerungen aufnehmen. Mit diesen Haltemitteln 10 kann, wie bereits erwähnt die zu entfernende Druckform A vollständig aus dem Druckwerk entfernt und in den die Ausschubschräge 3 nach unten begrenzenden Haltebügel 16 eingestellt werden. Oberhalb der Ausschrubschräge 3 ist die Einführschräge 2 jeweils schematisch angedeutet. Um die Achse 8 ist die Ebene schwenkbar, in welcher die Haltemittel 9 aufgenommen sind. Die Haltemittel 9 sind dabei untereinander durch eine zentrales Luftunterdruckversorgungssystem miteinander verbunden, was die gleichzeitige und gleichmäßige Beaufschlagung dieser Haltemittel während des Einführens der neuen Druckform B gewährleistet. Bei Maschinen mit mehreren am Druckformzylinder nebeneinander aufgenommenen Druckformen können selbstverständlich mehrere erfindungsgemäße Druckformwechseleinheiten nebeneinander angeordnet werden.2 also shows that the actuating cylinders actuating the holding means 10 below the extension slope 3 are arranged and the holding means 10 pick up on rod-shaped extensions. With these Holding means 10 can, as already mentioned, the one to be removed Printing form A completely removed from the printing unit and into which the Extension slope 3 downward holding bracket 16 can be set. Above the bevel 3 is the Insertion bevel 2 each indicated schematically. About the axis 8, the plane is pivotable in which the holding means 9 are included. The holding means 9 are among themselves through a central air vacuum supply system connected to each other, which is the simultaneous and uniform Actuation of these holding means during the insertion of the guaranteed new printing form B. For machines with several printing forms taken up next to each other on the printing form cylinder can of course several according to the invention Printing form change units can be arranged side by side.

Fig. 3 zeigt eine vergrößerte Darstellung der eine neu aufzubringende Druckform B fixierenden Halteelemente.Fig. 3 shows an enlarged view of a new to be applied printing form B fixing holding elements.

Die Halteelemente 82 und 83 sind als Winkelstücke ausgebildet, wobei sie von einer zylindrischen Stelleinheit 84 bewegt werden können. Ein Halteelement, in diesem Falle das Halteelement 82 weist einen seitlichen Anschlag 81 auf, um die neu aufzubringende Druckform B korrekt vor dem Einzug ins Druckwerk seitlich auszurichten. The holding elements 82 and 83 are as elbows trained, being of a cylindrical Actuator 84 can be moved. A holding element, in in this case the holding element 82 has a lateral one Stop 81 to the new printing form B align correctly sideways before feeding into the printing unit.

In der Darstellung gemäß Fig. 4 ist gezeigt, wie die zu wechselnde Druckform A vom Druckformzylinder 1 in die Ausschubschräge 3 einläuft. Das Hinterkantenende 29 liegt vor dem Haltebügel 16 auf einer Rolle auf. Die weitere Rotation des Druckformzylinders 1 in Pfeilrichtung bewirkt, daß die vom Druckformzylinder 1 ablaufende Druckform A auf die Rollen, die die Ausschubschräge 3 definieren, aufläuft. Der Ablauf der Druckform A vom Mantel des Druckformzylinders 1 wird durch die Anpreßwalze 17 unterstützt. Die Ablaufbewegung der zu wechselnden Druckform A erfolgt einzig und alleine durch die Bewegung des Druckformzylinders 1. Es bedarf keiner weiteren Unterstützung des Transportes der zu wechselnden Druckform A.4 shows how to changing printing form A from printing form cylinder 1 in the Extension slope 3 arrives. The trailing edge end 29 is present the bracket 16 on a roll. The further rotation of the printing form cylinder 1 in the direction of the arrow causes the from the printing form cylinder 1 printing form A on the Rolls that define the extension slope 3, accumulates. Of the Sequence of printing form A from the jacket of printing form cylinder 1 is supported by the pressure roller 17. The sequence movement the printing form A to be changed is done solely and alone by the movement of the printing form cylinder 1. There is no need further support of the transport of the to be changed Printing form A.

In der gezeigten Darstellung gemäß Fig. 4 ruht die neue Druckform B auf den in der Einführschräge 2 auf den Halteelementen 82 und 83. Das Stellzylinderpaar 4, 5 hält die Haltemittel 9 in einer abgeschwenkten Position.4, the new one is at rest Printing form B on the in the chamfer 2 on the Holding elements 82 and 83. The actuating cylinder pair 4, 5 holds the Holding means 9 in a pivoted position.

In der Darstellung gemäß Fig. 5 ist die vom Druckformzylinder 1 ablaufende Druckform A weiter in die Ausschubschräge 3 transportiert, jedoch noch nicht vom Haltemittel 10, welches durch den Stellzylinder 6 betätigt wird, ergriffen. Wie bereits in Fig. 4 erläutert, liegt die ablaufende Druckform A mit ihrer druckenden Oberfläche auf einer Rolle zum Schutz gegen Kratzer durch den Haltebügel 16 auf.5 is that of Printing form cylinder 1 running printing form A further into the Extension slope 3 transported, but not yet from Holding means 10, which is actuated by the actuating cylinder 6 is taken. As already explained in FIG. 4, the expiring printing form A with its printing surface a roller to protect against scratches by the bracket 16 on.

Die Betätigungselemente für die neue Druckform B, welche sich in der Einführschräge 2 befinden, sind nach wie vor in Ruhe.The actuators for the new printing form B, which are in the lead-in slope 2, are still in Quiet.

Im in Fig. 6 gezeigten Zustand hat die zu wechselnde Druckform A den Mantel des Druckformzylinders 1 verlassen. Die Vorderkante 28 der Druckform A ruht auf der Anpreßwalze 17. Sie wird weiterhin durch eine vor den Haltebügel 16 angeordnete Rolle gegen Verkratzen geschützt. Die Hinterkante 29 der zu wechselnden Druckform A hat die Rollen, die die Ausschübschräge 3 definieren, bereits verlassen. In dieser Position wird die druckende Seite der zu wechselnden Druckform A durch ein pneumatisches Haltemittel 10 ergriffen, da ein weiterer Transportvorschub entgegen der Schwerkraft in der Ausschubschräge 3 durch eine Rotation des Druckformzylinders 1 nicht mehr erfolgen kann, da kein Kontakt mehr mit diesem besteht.6 has the one to be changed Printing form A leave the jacket of printing form cylinder 1. The front edge 28 of the printing form A rests on the Pressure roller 17. It will continue to be in front of the Retaining bracket 16 arranged role protected against scratching. The rear edge 29 of the printing form A to be changed has the Rolls that define the extension slope 3 already leave. In this position, the printing side of the changing printing form A using a pneumatic holding device 10 seized because a further transport advance against the Gravity in the extension slope 3 by a rotation of the Printing form cylinder 1 can no longer take place, since none Contact more with this.

Gemäß der Darstellung in Fig. 7 wird die zu wechselnde Druckform A durch das Haltemittel 10, welches sich bis in eine ausgelenkte Lage 10' bewegt, soweit in die Ausschubschräge 3 transportiert, bis die Vorderkante 28 der zu wechselnden Druckform 8 in die Haltebügel 16 einrastet und dort aufliegt. In dieser Lage ist die zu wechselnde Druckform A gegen Beschädigung und gegen Herabfallen gesichert, daher kann der Unterdruck im Haltemittel 10 abgeschaltet werden, und die zu wechselnde Druckform A vom Drucker entommen werden. In diesem Zustand sind die die neue Druckform B bewegenden Vorrichtungen noch in Ruhe.7 is the one to be changed Printing form A through the holding means 10, which is up to a deflected position 10 'moves as far as in the Extension slope 3 transported until the front edge 28 of the to change printing form 8 snaps into the bracket 16 and rests there. This is the position to be changed Printing form A against damage and against falling secured, therefore the negative pressure in the holding means 10 be switched off, and the printing form A to be changed from Printer removed. In this state they are the new ones Printing form B moving devices still at rest.

Im in Fig. 8 gezeigten Zustand werden die in einer um die Achse 8 schwenkbaren Ebene aufgenommenen pneumatischen Haltemittel 9 durch das Stellzylinderpaar 4, 5 in Kontakt mit der Rückseite der neuen Druckform B gebracht. Die Schwenkbewegung der Ebene mit den Haltemitteln 9 um die Achse 8 hat zur Folge, daß sich die Führungsschräge 7 aufstellt und einen Einlauftrichter definiert. Nunmehr rotiert der Druckformzylinder 1 im Kriechgang in Pfeilrichtung entgegengesetzt zur in den bisherigen Figuren dargestellten Drehrichtung. Die Halteelemente 82 und 83 fahren in ihre Stelleinheiten zurück und geben die Vorderkante 28 der neuen Druckform B frei. Diese wird nunmehr ausschließlich durch die Haltemittel 9 in der um die Achse 8 verschwenkbaren Ebene gehalten. Durch die Saugbeaufschlagung der Haltemittel 9 stellt sich der vordere Bereich der neuen Druckform B gegen die Mantelfläche des Druckformzylinders 1 an. Dadurch wird die Vorderkante 28' der neuen Druckform B vom Kanal 11 des Druckformzylinders 1 ergriffen, wodurch sich der Beginn der Einzugsbewegung der neuen Druckform B einstellt. Da die Haltemittel 9 in der um die Achse 8 schwenkbaren Ebene kontinuierlich mit Unterdruck beaufschlagt sind, kann während der Einziehbewegung der neuen Druckform B diese in einer die Einlaufbewegung begünstigenden Position gehalten werden. Die Fixierung des jeweils noch nicht auf dem Mantel des Druckformzylinders 1 befindlichen Abschnittes der neuen Druckform erfolgt ausschließlich durch die Haltemittel 9. Bei Verwendung kompakt bauender elektromotorischer Antriebsmittel anstelle der Stellzylinder 4, 5 zur Bewegung der Haltemittel 9 könnte in Weiterentwicklung der erfindungsgemäßen Vorrichtung ein Einführen der Druckformvorderkante in den Kanal 11 just in dem Augenblick erfolgen, in dem der Kanal 11 unterhalb der Druckformvorderkante 28' liegt.In the state shown in Fig. 8, those in one order Axis 8 swiveling plane incorporated pneumatic Holding means 9 through the actuating cylinder pair 4, 5 in contact with the back of the new printing form B. The Pivotal movement of the plane with the holding means 9 around Axis 8 has the result that the guide slope 7th sets up and defines an inlet funnel. Now the printing form cylinder 1 rotates in the crawl gear in Direction of arrow opposite to that in previous figures shown direction of rotation. Drive the holding elements 82 and 83 back into their actuators and give the leading edge 28 the new printing form B free. This will now be exclusive by the holding means 9 in the pivotable about the axis 8 Kept level. By suction of the holding means 9 the front area of the new printing form B is juxtaposed the outer surface of the printing form cylinder 1. This will make the Front edge 28 'of the new printing form B from the channel 11 of the Printing form cylinder 1 gripped, which marks the beginning of Feeding movement of the new printing form B adjusts. Since the Holding means 9 in the plane pivotable about the axis 8 are continuously subjected to negative pressure, can during the retraction movement of the new printing form B this in a Incoming movement favoring position are held. The Fixing the not yet on the jacket of the Printing form cylinder 1 section of the new Printing form takes place exclusively through the holding means 9. At Use of compact electromotive drive means instead of the actuating cylinders 4, 5 for moving the Retaining means 9 could be in further development device according to the invention an insertion of Printing form leading edge in channel 11 just at that moment take place in which the channel 11 below the Printing form front edge 28 'lies.

In Fig. 10 ist der vollständige Einzug der neuen Druckform B auf die Mantelfläche des Druckformzylinders 1 nahezu abgeschlossen. Die Vorderkante 28' der neuen Druckform B ist in den Kanal 11 eingeführt, während das rückwärtige Ende 29' der Druckform B noch durch die Haltemittel 9 oberhalb der Einführschräge 2 gehalten wird. Ein Abschalten des Unterdrucks zum jetzigen Zeitpunkt bewirkt eine Freigabe der Hinterkante 29' der neuen Druckform B, wodurch unterstützt durch die Anpreßwalze 17, die neue Druckform B auf den Mantel des Druckformzylinders 1 gedrückt wird, bis nach Passage der Anpreßwalze das rückwärtige Ende 29' der Druckform B in den Kanal 11 des Druckformzylinders 1 eintaucht. 10 is the complete insertion of the new printing form B. almost on the lateral surface of the printing form cylinder 1 completed. The front edge 28 'of the new printing form B is inserted into the channel 11, while the rear end 29 ' the printing form B still through the holding means 9 above the Entry chamfer 2 is held. Switching off the Vacuum at the current time causes the release of Trailing edge 29 'of the new printing form B, which supports by the pressure roller 17, the new printing form B on the jacket of the printing form cylinder 1 is pressed until after passage of the Pressure roller the rear end 29 'of the printing form B in the Channel 11 of the printing form cylinder 1 is immersed.

BezugszeichenlisteReference list

11
DruckformzylinderPrinting form cylinder
22nd
EinführschrägeChamfer
33rd
AusschubschrägeDraft slope
44th
StellzylinderActuating cylinder
55
StellzylinderActuating cylinder
66
StellzylinderActuating cylinder
77
FührungsschrägeLeading slope
88th
Achseaxis
99
HaltemittelHolding means
1010th
weiteres Haltemittelfurther holding means
10'10 '
weiteres Haltemittel, ausgefahrenfurther holding means, extended
1111
Kanalchannel
1616
HaltebügelBracket
1717th
AnpreßwalzePressure roller
2727
KanalkanteChannel edge
2828
Vorderkante Druckform AFront edge of printing form A
28'28 '
Vorderkante Druckform BFront edge of printing form B
2929
Hinterkante Druckform ATrailing edge of printing form A
29'29 '
Hinterkante Druckform BTrailing edge of printing form B
4040
ÜbertragungszylinderTransfer cylinder
8080
zweite Stelleinheitsecond actuator
8181
SeitenanschlagSide stop
8282
HaltestiftRetaining pin
8383
HaltestiftRetaining pin
8484
zweite Stelleinheitsecond actuator
AA
zu wechselnde Druckformprinting form to be changed
BB
neue Druckformnew printing form

Claims (14)

  1. Apparatus for changing printing formes on rotary printing machines which comprise printing-forme cylinders (1) which receive the two ends (28, 29) of a printing forme in a channel (11), the surface of the printing formes being wound around the printing-forme cylinder (1), and a printing forme (A) still located on the printing-forme cylinder (1) being released by tension devices and being transportable into a device (3) reveiving it, and with a device (2) for feeding a new printing forme (B) to the printing-forme cylinder (1), characterized in that pivotable holding means (9) temporarily fixing a region of the printing forme (B) to be fed deform the said printing forme (B) elastically in such a way that one end (28) of the new printing forme (B) is thrown onto the outer surface of the printing-forme cylinder (1) so as to be automatically introduced into a channel (11).
  2. Apparatus according to Claim 1, characterized in that the holding means (9) are arranged in a distributed manner in a plane pivotable about a pivot axis (8).
  3. Apparatus according to Claim 2, characterized in that the plane is movable by means of remotely controllable first actuating units (4, 5).
  4. Apparatus according to Claim 2, characterized in that the pivotable plane is arranged above an introduction slope (2).
  5. Apparatus according to Claim 1, characterized in that the pivotable holding means (9) are vacuum-loaded.
  6. Apparatus according to Claim 1, characterized in that the device (2) feeding a printing forme (B) is designed as an introduction slope.
  7. Apparatus according to Claim 1, characterized in that the device (3) receiving a printing forme (A) to be removed from the printing-forme cylinder (1) is designed as a pushing-out slope.
  8. Apparatus according to Claims 6 and 7, characterized in that the conveying planes of the printing formes in the introduction slope (2) and in the pushing-out slope (3) are formed by the circumferential surfaces of rotatably mounted bodies of revolution.
  9. Apparatus according to Claim 6, characterized in that the printing forme (B) to be fed can be received in the introduction slope (2) in an essentially upright position.
  10. Apparatus according to Claim 6, characterized in that horizontally movable holding elements (82, 83) are arranged underneath the introduction slope (2) in the region nearest to the outer surface of the printing-forme cylinder (1).
  11. Apparatus according to Claim 10, characterized in that the horizontally movable holding elements (82, 83) temporarily fix a leading edge (28') of a printing forme (B) to be fed.
  12. Apparatus according to Claim 10, characterized in that the horizontally movable holding elements (82, 83) are connected to second actuating units (80, 84).
  13. Apparatus according to Claim 7, characterized in that a further holding means (10) which grips the printing forme (A) to be removed and which conveys it into an extraction position is provided underneath the pushing-out slope (3).
  14. Apparatus according to Claim 7, characterized in that the pushing-out slope (3) has at least one holding yoke (16) in the lower region.
EP95102223A 1994-04-18 1995-02-17 Device for exchanging printing plates in a rotary printing machine Expired - Lifetime EP0678383B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9404609A FR2718675B1 (en) 1994-04-18 1994-04-18 Device for exchanging pictures of rotary printing machines.
FR9404609 1994-11-15

Publications (2)

Publication Number Publication Date
EP0678383A1 EP0678383A1 (en) 1995-10-25
EP0678383B1 true EP0678383B1 (en) 1998-05-13

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Application Number Title Priority Date Filing Date
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US (1) US5526747A (en)
EP (1) EP0678383B1 (en)
JP (1) JP3810453B2 (en)
AT (1) ATE166031T1 (en)
CA (1) CA2144195A1 (en)
DE (1) DE59502147D1 (en)
FR (1) FR2718675B1 (en)

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Also Published As

Publication number Publication date
JP3810453B2 (en) 2006-08-16
FR2718675B1 (en) 1996-07-12
DE59502147D1 (en) 1998-06-18
EP0678383A1 (en) 1995-10-25
CA2144195A1 (en) 1995-10-19
JPH07290688A (en) 1995-11-07
ATE166031T1 (en) 1998-05-15
FR2718675A1 (en) 1995-10-20
US5526747A (en) 1996-06-18

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