EP0110138B1 - Device for exchanging printing formes in an offset printing press - Google Patents

Device for exchanging printing formes in an offset printing press Download PDF

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Publication number
EP0110138B1
EP0110138B1 EP83110721A EP83110721A EP0110138B1 EP 0110138 B1 EP0110138 B1 EP 0110138B1 EP 83110721 A EP83110721 A EP 83110721A EP 83110721 A EP83110721 A EP 83110721A EP 0110138 B1 EP0110138 B1 EP 0110138B1
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EP
European Patent Office
Prior art keywords
forme
plate
suction roll
suction
film
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
Application number
EP83110721A
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German (de)
French (fr)
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EP0110138A3 (en
EP0110138A2 (en
Inventor
Hans Joachim Jähme
Harry Bracke
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.)
Neue Rotaprint GmbH
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Neue Rotaprint GmbH
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Filing date
Publication date
Application filed by Neue Rotaprint GmbH filed Critical Neue Rotaprint GmbH
Priority to AT83110721T priority Critical patent/ATE40080T1/en
Publication of EP0110138A2 publication Critical patent/EP0110138A2/en
Publication of EP0110138A3 publication Critical patent/EP0110138A3/en
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Publication of EP0110138B1 publication Critical patent/EP0110138B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L29/00—Devices for attaching printing elements or formes to supports
    • B41L29/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41L29/14—Clamping devices
    • B41L29/16—Clamping devices operating automatically during operation of rotary machines to attach the printing formes to the forme cylinders

Definitions

  • the present invention relates to a film changer for offset printing machines according to the preamble of the main claim.
  • a rubbing roller is provided which engages the top film of the film stack and is rotated at the appropriate point in time, so that the top film is pushed down from the film stack and placed in a guide device consisting of rollers and guides or guide plates, which it is used for Forme cylinder leads. It is held there during printing by known means, for example by suitable grippers. As soon as a film change is to be carried out, the grippers open on the basis of suitable controls and the film is conveyed from the forme cylinder into a storage for used films.
  • a disadvantage of this embodiment is, however, that the separation is not always satisfactory and that visible traces can appear on a finished printed product, since the friction roller acts on the surface of the film carrying the graphic information.
  • the suction roller does not roll on the cylinder with which it forms a conveyor roller nip. Rather, the printing film only reaches the conveyor roller gap when the suction roller is in its rear dead center position, that is to say it assumes a precisely defined position at this point in time.
  • the possibility of conveying the film into this position as long as printing is still taking place with the preceding printing film.
  • the film is only conveyed on when the press control activates the transport roller. Suitable control devices can also be provided which determine whether a printing film is properly in the conveyor roller nip during the waiting position described.
  • the arrangement of the adige and fixing container directly below the separating device results in a particularly space-saving arrangement which enables a compact construction of the printing press.
  • the negative pressure required for the suction roller is generated in a particularly simple manner in that the back and forth movement of the suction roller is used to move a piston back and forth in a fixed pump cylinder and thus to use the suction stroke of the piston to generate the negative pressure.
  • the reciprocating and at the same time rotating movement of the suction roller for peeling or unwinding the front section of the bottom film is generated by a degree guide of a crank mechanism, with a gear being provided at one end of the suction roller axis, which meshes with a rack fixedly arranged on the machine frame . Since the pitch circle diameter of the gear is equal to the suction roll diameter and the linear displacement of the suction roll corresponds to at least half of its development, the bottom film of the stack is initially subjected to bending alone without the action of any tensile stress, since the suction roll just after the suction of the bottom film in the mass is moved along the bottom of the film as the film wraps around the rotating suction roll.
  • the suction roller Due to the special design of the suction roller in several suction sections spaced apart in the axial direction with rollers or ball bearings arranged between them, freely movable with respect to the suction sections and having essentially the same (or slightly enlarged) diameter as the suction roller, the peeled off bottom film between one and the other succeeds to introduce parallel to the suction roller conveyor roller and the aforementioned rollers or ball bearings; only then is the film driven by a forced drive of the conveyor roller mentioned, i.e. when the actual separation process has long been completed.
  • the vacuum in the pump cylinder and thus also in the suction roller can be reduced at the right time by using the piston near its bottom dead center at the end of the suction stroke exposes one or more holes in the cylinder wall which vent the cylinder to the atmosphere.
  • the film changer is arranged obliquely above the forme cylinder of a conventional offset printing press, the construction of which is not discussed in detail in the context of this description, since it is sufficiently known.
  • the arrangement of the film stacking table is indicated by the film stack 2.
  • the underside of the table in the area of the front stacking edge has a sufficiently dimensioned opening so that the suction roller 4 can reach the foils in the foil stack 2 when it moves back and forth there under the influence of the crank mechanism 6 and rotates at the same time.
  • the front dead center position of the suction roller is shown in dashed lines, while the fully drawn rear position of the suction roller with the crank mechanism is in the corresponding position just before the rear dead center.
  • the suction roller 4 or its axis is rotatably mounted in the straight guide 8 of the crank mechanism 6, the outer end of the suction roller axis being connected to a gearwheel 10, the pitch circle diameter of which corresponds exactly to the diameter of the suction roller and which meshes with a toothed rack 12 attached to the machine frame 14 .
  • This mounting of the suction roller 4 in connection with the dimensioning of the gear 10 ensures that the suction roller 4 forcibly rolls or seems to roll on the underside of the film stack during its back and forth movement.
  • the suction roll is divided into individual suction roll sections 5 distributed over their length, one of which is shown in FIG. 2.
  • Each cylindrical suction roller section has a suction cup arranged on the circumference, which points vertically upwards in the front dead center position of the suction roller (shown in broken lines in FIG. 1) in order to engage the film, and which in the fully drawn position in FIG is twisted at the bottom.
  • This is the position just before reaching the rear dead center of the suction roll 4, i.e. at the rear dead center, the suction roller is rotated by a little more than 180 °, on the one hand to securely insert the film into the nip between the rollers 16 and the suction roller 4 and on the other hand not to let the film rub against the suction cups when the film is being removed.
  • freely rotatable rollers or ball bearings 16 are arranged with a diameter which essentially corresponds to the diameter of the suction roll sections or is slightly larger. The purpose of these ball bearings or rollers 16 will be discussed in more detail below.
  • the vacuum required for the singling process for the suction roll is generated in a particularly advantageous manner by taking advantage of the already existing back and forth movement of the straight guide 8.
  • the hollow axis of the suction roll is connected via the straight guide, which serves as a bearing for the suction roll axis, to a hollow piston rod 20, which reciprocates a piston 18 in a pump cylinder 19, which is axially aligned with the straight guide.
  • the suction cups on the suction roller sections 5 come in the vicinity of the front dead center position of the straight guide 8 (corresponds to the top dead center of the cylinder piston) or preferably shortly thereafter in contact with the bottom film, i. H. shortly after the start of the suction stroke of the pump piston. Since the suction cups are closed by the lowermost film, the vacuum required to hold the lowermost film on the suction cups of the suction roll sections 5 results due to the suction stroke of the pump piston 18, so that the film is on the underside of the film cassette during the forced rolling of the suction roll the suction roll winds, ie peeled down from the film stack.
  • the pump piston 18 Shortly before or when the end of the suction stroke is reached, the pump piston 18 exposes one or more ventilation bores 21 provided in the cylinder wall, which open into the atmosphere and cause the negative pressure in the pump cylinder and thus also in the suction roller 4 to collapse, since these parts are guided in a straight line 8 and the hollow piston rod 20 are connected to one another in a pressure-tight manner. As a result of this reduction in pressure, the film wound onto the suction roll 4 can detach from the suction cups at the rear dead center.
  • a conveyor roller 22 is arranged axially parallel to and perpendicularly below the suction roller 4 in its rear dead center position, in such a way that the ball bearings provided on the suction roller axis or the freely rotatable rollers 16 form a conveyor roller nip for the film peeled off from the underside of the stack. Due to the rotation and simultaneous linear displacement of the suction roller 4, the front edge of the bottom film of the stack is inserted into this conveyor roller nip. Since the negative pressure in the suction roller is reduced as previously explained when the rear dead center position (bottom dead center of the piston) is reached, the suction cups on the suction roller sections 5 no longer hold the peeled-off film in this position, so that the conveyor roller 22 is driven clockwise ( in Fig. 1) in Interaction with the rollers or ball bearings 16 on the suction roll axis when the suction roll 4 or straight guide 8 is not displaced pulls out the bottom film completely under the film stack 2.
  • the film conveyed between the rollers 16 and the conveying roller 22 is then guided downward into the fixing container 26 by a guide rail arrangement 24 which is essentially semicircular in section and which can be provided to form a correspondingly shaped slot on both sides of the transport path there is a suitable fixing fluid.
  • the aforementioned semicircular guide arrangement 24 has a straight extension 25 at its end, which leads the film pushed through the fixing bath out of it again and guides it in the direction of a pair of conveyor rollers 27, 28 which is provided at the end of the fixing container 26 facing the forme cylinder 3 .
  • the conveyor roller 27 is coupled to the aforementioned conveyor roller 22 via a belt drive or the like, the drive of the two conveyor rollers taking place synchronously with the printing press drive, for example via an electromagnetically actuated clutch which is activated by the machine control in a pulse-controlled manner when a new film is used to be applied to the forme cylinder 3.
  • the pair of conveying rollers 27, 28 pushes the printing film coming from the fixing container in the direction of the forme cylinder 3 under conventional grippers or the like, not shown, which hold the printing film on the forme cylinder, so that the printing film is automatically stretched onto the forme cylinder due to a corresponding rotation thereof .
  • the actual printing process that then follows of the offset printing machine with the stretched printing film is not described in more detail in the context of the present description, since it is sufficiently known and is not necessary to explain this invention.
  • the grippers mentioned are opened and the used film is automatically removed from the forme cylinder and, for example with the aid of the pair of conveying rollers 30, 31, is output into the tray 32 for used films.
  • the separating device activates again from the printing press control and, in the manner described, peels off the front section of the bottom film of the stack and brings it between the rollers 16 and the conveying roller 22, so that the film is completely pulled off the stacking table and can be passed through the fixing bath in order to then be pushed back into the grippers on the forme cylinder, which rotates at a corresponding speed in order to tension the film on the forme cylinder.

Landscapes

  • Sheets, Magazines, And Separation Thereof (AREA)
  • Rotary Presses (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Abstract

Plate changing apparatus for use with offset printing machines, including a plate stacking table, plate individualizing means for sequentially withdrawing only the lowermost plate from the stacking table, and plate transporting and guiding means to guide the freshly withdrawn plate to a form cylinder of the printing machine after having passed through a fixing bath. The apparatus includes means to pass the separated plate through a fixing bath prior to its deposit on the form cylinder and a depository for used plates removed from the form cylinder. The novelty resides in the individualizing means including a rotatable vacuum roll disposed adjacent a partly open bottom surface of the plate stacking table or container or tray holding the plates so that it can engage the lowermost plate. The vacuum roll has its shaft mounted in parallel with the leading edge of the plate stack for linear displacement in parallel with the bottom stack surface. A fixing bath container is disposed directly below the plate stack and the individualizing means and adjacent the form cylinder. This arrangement results in a particularly compact construction while enabling the plates to be handled carefully.

Description

Die vorliegende Erfindung betrifft einen Folienwechsler für Offset-Druckmaschinen nach dem Oberbegriff des Hauptanspruchs.The present invention relates to a film changer for offset printing machines according to the preamble of the main claim.

Derartige Folienwechsler können mit verschiedenen Vereinzelungsvorrichtungen arbeiten. Nach einer Ausführung ist eine Reibwalze vorgesehen, die an der obersten Folie des Folienstapels angreift und zum geeigneten Zeitpunkt in Drehung versetzt wird, so dass die oberste Folie vom Folienstapel heruntergeschoben und in eine aus Walzen und Führungen oder Leitblechen bestehende Führungseinrichtung gegeben wird, die sie zum Formzylinder führt. Dort wird sie während des Druckens durch bekannte Mittel, beispielsweise durch geeignete Greifer, festgehalten. Sobald ein Folienwechsel vorgenommen werden soll, öffnen sich die Greifer aufgrund geeigneter Steuerungen und die Folie wird vom Formzylinder in eine Ablage für benutzte Folien abgefördert. Ein Nachteil dieser Ausführung ist indessen, dass die Vereinzelung nicht immer zufriedenstellend erfolgt und dass es zu sichtbaren Spuren auf einem fertigen Druckerzeugnis kommen kann, da die Reibwalze an der die grafische Information tragenden Oberfläche der Folie angreift.Such film changers can work with different separating devices. According to one embodiment, a rubbing roller is provided which engages the top film of the film stack and is rotated at the appropriate point in time, so that the top film is pushed down from the film stack and placed in a guide device consisting of rollers and guides or guide plates, which it is used for Forme cylinder leads. It is held there during printing by known means, for example by suitable grippers. As soon as a film change is to be carried out, the grippers open on the basis of suitable controls and the film is conveyed from the forme cylinder into a storage for used films. A disadvantage of this embodiment is, however, that the separation is not always satisfactory and that visible traces can appear on a finished printed product, since the friction roller acts on the surface of the film carrying the graphic information.

Nach der US-Patentschrift 4 178 848 ist eine Saugvorrichtung vorgesehen, die nahe der Vorderkante der jeweils untersten Folie eines Folienstapels angreift und in diese durch einen Förderwalzenspalt zu einer Fördereinrichtung führt. Diese Ausführung weist aufgrund ihrer gestreckten Anordnung einen verhältnismässig hohen Raumbedarf auf, und zwar insbesondere dann, wenn die Folie noch durch einen dahinter angeordneten Etsch- oder Fixierbehälter geführt wird, wie es bei vorbekannten Fabrikaten der Fall ist. Nachteilig ist zudem, dass der erforderliche Unterdruck durch eine separate Pumpe erzeugt werden muss.According to US Pat. No. 4,178,848, a suction device is provided which engages near the front edge of the bottom film of a stack of films and leads into this through a conveyor roller nip to a conveyor. Due to its elongated arrangement, this design requires a relatively large amount of space, in particular when the film is still passed through an adder or fixing container arranged behind it, as is the case with previously known makes. Another disadvantage is that the required vacuum must be generated by a separate pump.

Zur Vereinzelung von Papierbögen von einem Stapel sind Konstruktionen beschrieben worden, die mit an der Stapelunterseite angreifenden Saugwalzen arbeiten (französische Patentschriften 540479 und 2354949). Diese Ausführungen sind für die Druckfolienvereinzelung nicht geeignet, insbesondere weil beim Ansaugen des unteren Blatts Versatz auftreten kann. Beim Druckfolieneinzug ist es aber erforderlich, dass die Folie eine genau definierte Lage einnimmt, da ungenau eingelegte Folien zu Fehlern im Druckbild führen. Auch bei den genannten Lösungen wird der erforderliche Unterdruck im übrigen durch eine separate Pumpe erzeugt.For the separation of sheets of paper from a stack, constructions have been described which work with suction rollers acting on the underside of the stack (French patents 540479 and 2354949). These designs are not suitable for separating the printing film, especially because misalignment can occur when the lower sheet is sucked in. When pulling in the printing film, however, it is necessary for the film to assume a precisely defined position, since inaccurately inserted films lead to errors in the printed image. In the solutions mentioned, the required negative pressure is also generated by a separate pump.

Es wird daher als die der vorliegenden Erfindung zugrundeliegende Aufgabe angesehen, vorbekannte Einrichtungen derart weiterzubilden, dass eine schonende und zuverlässige Folienvereinzelung bei kompakter Bauweise und möglichst wenigen Einzelteilen des Folienwechslers erreicht wird.It is therefore regarded as the object on which the present invention is based to develop previously known devices in such a way that gentle and reliable film separation is achieved with a compact design and as few individual parts of the film changer as possible.

Diese Aufgabe wird erfindungsgemäss durch die Lehren des Hauptanspruchs gelöst. Anders als bei der F-PS 2 354 949 rollt die Saugwalze nicht auf dem Zylinder ab, mit dem sie einen Förderwalzenspalt bildet. Vielmehr erreicht die Druckfolie den Förderwalzenspalt erst dann, wenn sich die Saugwalze in ihrer hinteren Totpunktlage befindet, nimmt also zu diesem Zeitpunkt eine genau definierte Lage ein. Überdies besteht die Möglichkeit, die Folie in diese Stellung bereits dann zu fördern, solange mit der vorangehenden Druckfolie noch gedruckt wird. Erst wenn die Druckmaschinensteuerung die Transportwalze aktiviert, wird die Folie weitergefördert. Es können ferner geeignete Kontrollvorrichtungen vorgesehen werden, die feststellen, ob eine Druckfolie während der beschriebenen Wartestellung ordnungsgemäss im Förderwalzenspalt anliegt.According to the invention, this object is achieved by the teachings of the main claim. Unlike the F-PS 2 354 949, the suction roller does not roll on the cylinder with which it forms a conveyor roller nip. Rather, the printing film only reaches the conveyor roller gap when the suction roller is in its rear dead center position, that is to say it assumes a precisely defined position at this point in time. In addition, there is the possibility of conveying the film into this position as long as printing is still taking place with the preceding printing film. The film is only conveyed on when the press control activates the transport roller. Suitable control devices can also be provided which determine whether a printing film is properly in the conveyor roller nip during the waiting position described.

Durch die Anordnung des Etsch- und Fixierbehälters direkt unterhalb der Vereinzelungsvorrichtung wird eine besonders raumsparende Anordnung erreicht, die eine kompakte Bauweise der Druckmaschine ermöglicht.The arrangement of the adige and fixing container directly below the separating device results in a particularly space-saving arrangement which enables a compact construction of the printing press.

Aufgrund der Verwendung einer Saugwalze ist eine zuverlässige und schonende Vereinzelung gewährleistet, weil die Saugwalze an der nicht druckenden Fläche der Folie angreift. Der für die Saugwalze benötigte Unterdruck wird in besonders einfacher Weise dadurch erzeugt, dass die Hin- und Herbewegung der Saugwalze dazu ausgenutzt wird, einen Kolben in einem feststehenden Pumpenzylinder hin- und herzubewegen und so den Saughub des Kolbens zur Erzeugung des Unterdrucks heranzuziehen.Due to the use of a suction roller, a reliable and gentle separation is guaranteed because the suction roller acts on the non-printing surface of the film. The negative pressure required for the suction roller is generated in a particularly simple manner in that the back and forth movement of the suction roller is used to move a piston back and forth in a fixed pump cylinder and thus to use the suction stroke of the piston to generate the negative pressure.

Dabei wird die hin- und hergehende und gleichzeitig drehende Bewegung der Saugwalze zum Abschälen oder Abwickeln des vorderen Abschnitts der untersten Folie durch eine Gradführung eines Kurbeltriebs erzeugt, wobei an einem Ende der Saugwalzenachse ein Zahnrad vorgesehen ist, welches mit einer am Maschinengestell fest angeordneten Zahnstange kämmt. Indem der Teilkreisdurchmesser des Zahnrads gleich dem Saugwalzendurchmesser ist und die Linearverschiebung der Saugwalze mindestens ihrer halben Abwicklung entspricht, wird die unterste Folie des Stapels zunächst ohne Einwirkung irgendeiner Zugspannung allein auf Biegung beansprucht, da die Saugwalze nach dem Ansaugen der untersten Folie gerade in dem Masse an der Unterseite der Folie entlang bewegt wird, wie sich die Folie um die sich drehende Saugwalze wickelt.The reciprocating and at the same time rotating movement of the suction roller for peeling or unwinding the front section of the bottom film is generated by a degree guide of a crank mechanism, with a gear being provided at one end of the suction roller axis, which meshes with a rack fixedly arranged on the machine frame . Since the pitch circle diameter of the gear is equal to the suction roll diameter and the linear displacement of the suction roll corresponds to at least half of its development, the bottom film of the stack is initially subjected to bending alone without the action of any tensile stress, since the suction roll just after the suction of the bottom film in the mass is moved along the bottom of the film as the film wraps around the rotating suction roll.

Durch die besondere Ausbildung der Saugwalze in mehrere, in axialer Richtung voneinander beabstandete Saugabschnitte mit dazwischen angeordneten, bezüglich der Saugabschnitte frei bewegbaren Rollen oder Kugellagern mit im wesentlichen dem gleichen (oder leicht vergrössertem) Durchmesser wie die Saugwalze gelingt es, die abgeschälte unterste Folie zwischen einer zur Saugwalze achsparallelen Förderwalze und den genannten Rollen oder Kugellagern einzuführen; erst danach wird durch einen zwangsweisen Antrieb der genannten Förderwalze die Folie auf Zug beansprucht, d.h. wenn der eigentliche Vereinzelungsvorgang längst abgeschlossen ist.Due to the special design of the suction roller in several suction sections spaced apart in the axial direction with rollers or ball bearings arranged between them, freely movable with respect to the suction sections and having essentially the same (or slightly enlarged) diameter as the suction roller, the peeled off bottom film between one and the other succeeds to introduce parallel to the suction roller conveyor roller and the aforementioned rollers or ball bearings; only then is the film driven by a forced drive of the conveyor roller mentioned, i.e. when the actual separation process has long been completed.

Der Unterdruck im Pumpenzylinder und damit auch in der Saugwalze kann zum richtigen Zeitpunkt dadurch abgebaut werden, dass der Kolben in der Nähe seines unteren Totpunktes am Ende des Saughubs eine oder mehrere Bohrungen in der Zylinderwand frei legt, die den Zylinder zur Atmosphäre hin belüften.The vacuum in the pump cylinder and thus also in the suction roller can be reduced at the right time by using the piston near its bottom dead center at the end of the suction stroke exposes one or more holes in the cylinder wall which vent the cylinder to the atmosphere.

Eine Ausführungsform der vorliegenden Erfindung wird im nachfolgenden unter Bezugnahme auf die beigefügten Figuren beschrieben.

  • Figur 1 zeigt in schematischer Darstellung eine Seitenansicht des Folienwechslers mit dem Formzylinder einer Offset-Druckmaschine. Dabei ist nur die prinzipielle Anordnung der Einzelteile dargestellt, d.h. ohne konstruktive Details, um so die Übersichtlichkeit zu wahren.
  • Figur 2 ist eine Teilansicht der Figur 1 von rechts, wiederum im wesentlichen in prinzipieller Darstellung.
An embodiment of the present invention is described below with reference to the accompanying figures.
  • Figure 1 shows a schematic representation of a side view of the film changer with the form cylinder of an offset printing press. Only the basic arrangement of the individual parts is shown, ie without constructional details, in order to maintain clarity.
  • Figure 2 is a partial view of Figure 1 from the right, again essentially in principle.

Wie in Figur 1 gezeigt, ist der Folienwechsler schräg oberhalb des Formzylinders einer üblichen Offset-Druckmaschine angeordnet, auf deren Aufbau im Rahmen dieser Beschreibung nicht näher eingegangen wird, da er hinlänglich bekannt ist.As shown in FIG. 1, the film changer is arranged obliquely above the forme cylinder of a conventional offset printing press, the construction of which is not discussed in detail in the context of this description, since it is sufficiently known.

Die Anordnung des Folienstapeltisches ist durch den Folienstapel 2 angedeutet. Der Tisch weist an seiner Unterseite im Bereich der vorderen Stapelkante eine ausreichend dimensionierte Öffnung auf, so dass die Saugwalze 4 an die Folien im Folienstapel 2 heranreichen kann, wenn sie sich dort unter dem Einfluss des Kurbeltriebes 6 hin- und herbewegt und gleichzeitig dreht. Die vordere Totpunktlage der Saugwalze ist gestrichelt eingezeichnet, während die voll durchgezeichnete hintere Position der Saugwalze mit dem Kurbeltrieb in der entsprechenden Stellung kurz vor dem hinteren Totpunkt liegt. Die Saugwalze 4 bzw. ihrer Achse ist in der Geradführung 8 des Kurbeltriebes 6 drehbar gelagert, wobei das äussere Ende der Saugwalzenachse mit einem Zahnrad 10 verbunden ist, dessen Teilkreisdurchmesser gerade dem Durchmesser der Saugwalze entspricht und das mit einer am Maschinengestell 14 befestigten Zahnstange 12 kämmt. Durch diese Lagerung der Saugwalze 4 im Zusammenhang mit der Dimensionierung des Zahnrades 10 wird erreicht, dass die Saugwalze 4 bei ihrer Hin- und Herbewegung an der Unterseite des Folienstapels auf dieser zwangsweise abrollt bzw. abzurollen scheint.The arrangement of the film stacking table is indicated by the film stack 2. The underside of the table in the area of the front stacking edge has a sufficiently dimensioned opening so that the suction roller 4 can reach the foils in the foil stack 2 when it moves back and forth there under the influence of the crank mechanism 6 and rotates at the same time. The front dead center position of the suction roller is shown in dashed lines, while the fully drawn rear position of the suction roller with the crank mechanism is in the corresponding position just before the rear dead center. The suction roller 4 or its axis is rotatably mounted in the straight guide 8 of the crank mechanism 6, the outer end of the suction roller axis being connected to a gearwheel 10, the pitch circle diameter of which corresponds exactly to the diameter of the suction roller and which meshes with a toothed rack 12 attached to the machine frame 14 . This mounting of the suction roller 4 in connection with the dimensioning of the gear 10 ensures that the suction roller 4 forcibly rolls or seems to roll on the underside of the film stack during its back and forth movement.

Die Saugwalze ist in einzelne, auf ihre Länge verteilte Saugwalzenabschnitte 5 aufgeteilt, von denen einer in Figur 2 gezeigt ist. Jeder zylinderförmige Saugwalzenabschnitt weist einen am Umfang angeordneten Saugnapf auf, der in der vorderen Totpunktslage der Saugwalze (in Fig. 1 gestrichelt gezeichnet) senkrecht nach oben weist, um an der Folie anzugreifen, und der in der in Fig. 1 voll durchgezeichneten Stellung senkrecht nach unten verdreht ist. Dies ist die kurz vor Erreichen des hinteren Totpunkts der Saugwalze 4 eingenommene Stellung, d.h. im hinteren Totpunkt ist die Saugwalze um etwas mehr als 180° verdreht, um die Folie einerseits mit Sicherheit in den Förderwalzenspalt zwischen den Rollen 16 und der Saugwalze 4 einzuführen und andererseits die Folie beim Abfördern der Folie nicht an den Saugnäpfen entlangreiben zu lassen.The suction roll is divided into individual suction roll sections 5 distributed over their length, one of which is shown in FIG. 2. Each cylindrical suction roller section has a suction cup arranged on the circumference, which points vertically upwards in the front dead center position of the suction roller (shown in broken lines in FIG. 1) in order to engage the film, and which in the fully drawn position in FIG is twisted at the bottom. This is the position just before reaching the rear dead center of the suction roll 4, i.e. at the rear dead center, the suction roller is rotated by a little more than 180 °, on the one hand to securely insert the film into the nip between the rollers 16 and the suction roller 4 and on the other hand not to let the film rub against the suction cups when the film is being removed.

Auf der Achse der Saugwalze 4 sind im übrigen, jeweils neben den Saugwalzenabschnitten 5 gegenüber der Achse frei drehbare Rollen oder Kugellager 16 mit einem Durchmesser angeordnet, der im wesentlichen dem Durchmesser der Saugwalzenabschnitte entspricht oder geringfügig grösser ist. Auf den Zweck dieser Kugellager oder Rollen 16 wird weiter unten näher eingegangen werden.Incidentally, on the axis of the suction roll 4, in addition to the suction roll sections 5, freely rotatable rollers or ball bearings 16 are arranged with a diameter which essentially corresponds to the diameter of the suction roll sections or is slightly larger. The purpose of these ball bearings or rollers 16 will be discussed in more detail below.

Der für den Vereinzelungsvorgang notwendige Unterdruck für die Saugwalze wird in besonders vorteilhafter Weise dadurch erzeugt, dass die ohnehin vorhandene Hin- und Herbewegung der Geradführung 8 ausgenutzt wird. Zu diesem Zweck ist die hohl ausgebildete Achse der Saugwalze über die Geradführung, welche als Lagerung der Saugwalzenachse dient, mit einer hohlen Kolbenstange 20 verbunden, die einen Kolben 18 in einem Pumpenzylinder 19 hin- und herbewegt, der auf die Geradführung axial ausgerichtet ist.The vacuum required for the singling process for the suction roll is generated in a particularly advantageous manner by taking advantage of the already existing back and forth movement of the straight guide 8. For this purpose, the hollow axis of the suction roll is connected via the straight guide, which serves as a bearing for the suction roll axis, to a hollow piston rod 20, which reciprocates a piston 18 in a pump cylinder 19, which is axially aligned with the straight guide.

Die Saugnäpfe an den Saugwalzenabschnitten 5 kommen in der Nähe der vorderen Totpunktslage der Geradführung 8 (entspricht dem oberen Totpunkt des Zylinderkolbens) oder vorzugsweise kurz danach in Anlage mit der untersten Folie, d. h. kurz nach Beginn des Saughubes des Pumpenkolbens. Da die Saugnäpfe von der untersten Folie verschlossen werden, entsteht infolge des Saughubes des Pumpenkolbens 18 der benötigte Unterdruck, der die unterste Folie an den Saugnäpfen der Saugwalzenabschnitte 5 festhält, so dass die Folie sich während des zwangsweisen Abrollens der Saugwalze an der Unterseite der Folienkassette auf die Saugwalze wickelt, d.h. vom Folienstapel nach unten abgeschält wird. Kurz vor oder bei Erreichen des Endes des Saughubes legt der Pumpenkolben 18 eine oder mehrere in der Zylinderwandung vorgesehene Belüftungsbohrungen 21 frei, die in die Atmosphäre münden und den Unterdruck im Pumpenzylinder und somit auch in der Saugwalze 4 zusammenbrechen lassen, da diese Teile über die Geradführung 8 und die hohle Kolbenstange 20 druckdicht miteinander verbunden sind. Durch diesen Druckabbau kann sich die auf die Saugwalze 4 aufgewickelte Folie am hinteren Totpunkt von den Saugnäpfen lösen.The suction cups on the suction roller sections 5 come in the vicinity of the front dead center position of the straight guide 8 (corresponds to the top dead center of the cylinder piston) or preferably shortly thereafter in contact with the bottom film, i. H. shortly after the start of the suction stroke of the pump piston. Since the suction cups are closed by the lowermost film, the vacuum required to hold the lowermost film on the suction cups of the suction roll sections 5 results due to the suction stroke of the pump piston 18, so that the film is on the underside of the film cassette during the forced rolling of the suction roll the suction roll winds, ie peeled down from the film stack. Shortly before or when the end of the suction stroke is reached, the pump piston 18 exposes one or more ventilation bores 21 provided in the cylinder wall, which open into the atmosphere and cause the negative pressure in the pump cylinder and thus also in the suction roller 4 to collapse, since these parts are guided in a straight line 8 and the hollow piston rod 20 are connected to one another in a pressure-tight manner. As a result of this reduction in pressure, the film wound onto the suction roll 4 can detach from the suction cups at the rear dead center.

Eine Förderwalze 22 ist achsparallel zu und senkrecht unterhalb der Saugwalze 4 in ihrer hinteren Totpunktlage angeordnet, und zwar derart, dass die auf der Saugwalzenachse vorgesehenen Kugellager bzw. die frei drehbaren Rollen 16 einen Förderwalzenspalt für die von der Stapelunterseite abgeschälte Folie bilden. Aufgrund der Drehung und gleichzeitigen Linearverschiebung der Saugwalze 4 wird die Vorderkante der untersten Folie des Stapels in diesen Förderwalzenspalt eingeführt. Da der Unterdruck in der Saugwalze wie zuvor erläutert bei Erreichen der hinteren Totpunktlage (unterer Totpunkt des Kolbens) abgebaut wird, halten die Saugnäpfe an den Saugwalzenabschnitten 5 die abgeschälte Folie in dieser Stellung nicht mehr fest, so dass ein Antrieb der Förderwalze 22 im Uhrzeigersinn (in Fig. 1) im Zusammenwirken mit den Rollen oder Kugellagern 16 auf der Saugwalzenachse bei nicht verschobener Saugwalze 4 oder Geradführung 8 die unterste Folie vollständig unter dem Folienstapel 2 herauszieht.A conveyor roller 22 is arranged axially parallel to and perpendicularly below the suction roller 4 in its rear dead center position, in such a way that the ball bearings provided on the suction roller axis or the freely rotatable rollers 16 form a conveyor roller nip for the film peeled off from the underside of the stack. Due to the rotation and simultaneous linear displacement of the suction roller 4, the front edge of the bottom film of the stack is inserted into this conveyor roller nip. Since the negative pressure in the suction roller is reduced as previously explained when the rear dead center position (bottom dead center of the piston) is reached, the suction cups on the suction roller sections 5 no longer hold the peeled-off film in this position, so that the conveyor roller 22 is driven clockwise ( in Fig. 1) in Interaction with the rollers or ball bearings 16 on the suction roll axis when the suction roll 4 or straight guide 8 is not displaced pulls out the bottom film completely under the film stack 2.

Die zwischen den Rollen 16 und der Förderwalze 22 hindurchgeförderte Folie wird dann von einer im Schnitt im wesentlichen halbkreisförmig ausgebildeten Leitschienenanordnung 24, die zur Ausbildung eines entsprechend geformten Schlitzes auf beiden Seiten des Transportweges vorgesehen sein kann, nach unten in den Fixierbehälter 26 geführt, in dem sich eine geeignete Fixierflüssigkeit befindet. Die genannte halbkreisförmige Leitanordnung 24 weist an ihrem Ende eine gerade Verlängerung 25 auf, welche die durch das Fixierbad geschobene Folie wieder aus diesem herausführt und in Richtung auf ein Förderwalzenpaar 27, 28 leitet, das an dem zum Formzylinder 3 gewandten Ende des Fixierbehälters 26 vorgesehen ist. Die Förderwalze 27 ist über einen Riementrieb oder dergleichen mit der vorgenannten Förderwalze 22 gekoppelt, wobei der Antrieb der beiden Förderwalzen synchron zum Druckmaschinenantrieb erfolgt, und zwar beispielsweise über eine elektromagnetisch betätigbare Kupplung, die von der Maschinensteuerung impulsgesteuert in Betrieb gesetzt wird, wenn eine neue Folie auf den Formzylinder 3 aufgebracht werden soll.The film conveyed between the rollers 16 and the conveying roller 22 is then guided downward into the fixing container 26 by a guide rail arrangement 24 which is essentially semicircular in section and which can be provided to form a correspondingly shaped slot on both sides of the transport path there is a suitable fixing fluid. The aforementioned semicircular guide arrangement 24 has a straight extension 25 at its end, which leads the film pushed through the fixing bath out of it again and guides it in the direction of a pair of conveyor rollers 27, 28 which is provided at the end of the fixing container 26 facing the forme cylinder 3 . The conveyor roller 27 is coupled to the aforementioned conveyor roller 22 via a belt drive or the like, the drive of the two conveyor rollers taking place synchronously with the printing press drive, for example via an electromagnetically actuated clutch which is activated by the machine control in a pulse-controlled manner when a new film is used to be applied to the forme cylinder 3.

Das Förderwalzenpaar 27, 28 schiebt die aus dem Fixierbehälter kommende Druckfolie in Richtung auf den Formzylinder 3 unter nicht näher dargestellte übliche Greifer oder dergleichen, die die Druckfolie auf den Formzylinder festhalten, so dass die Druckfolie auf den Formzylinder aufgrund einer entsprechenden Drehung desselben selbsttätig aufgespannt wird. Der dann folgende eigentliche Druckvorgang der Offset-Druckmaschine mit der aufgespannten Druckfolie wird im Rahmen der vorliegenden Beschreibung nicht näher ausgeführt, da er hinlänglich bekannt ist und zur Erläuterung dieser Erfindung nicht notwendig ist. Nach Abschluss des Druckens mit dieser Folie werden die genannten Greifer geöffnet und die benutzte Folie wird vom Formzylinder selbsttätig abgenommen und etwa mit Hilfe des Förderwalzenpaares 30, 31 in die Ablage 32 für benutzte Folien ausgegeben.The pair of conveying rollers 27, 28 pushes the printing film coming from the fixing container in the direction of the forme cylinder 3 under conventional grippers or the like, not shown, which hold the printing film on the forme cylinder, so that the printing film is automatically stretched onto the forme cylinder due to a corresponding rotation thereof . The actual printing process that then follows of the offset printing machine with the stretched printing film is not described in more detail in the context of the present description, since it is sufficiently known and is not necessary to explain this invention. After printing with this film has been completed, the grippers mentioned are opened and the used film is automatically removed from the forme cylinder and, for example with the aid of the pair of conveying rollers 30, 31, is output into the tray 32 for used films.

Anschliessend tritt von der Druckmaschinen-Steuerung aktiviert wieder die Vereinzelungsvorrichtung in Tätigkeit und schält in der beschriebenen Weise den vorderen Abschnitt der untersten Folie des Stapels ab und bringt ihn zwischen die Rollen 16 und die Förderwalze 22 ein, so dass die Folie vollständig von dem Stapeltisch abgezogen und durch das Fixierbad geführt werden kann, um danach wieder in die Greifer am Formzylinder geschoben zu werden, der mit einer entsprechenden Drehzahl rotiert, um die Folie auf den Formzylinder zu spannen.Subsequently, the separating device activates again from the printing press control and, in the manner described, peels off the front section of the bottom film of the stack and brings it between the rollers 16 and the conveying roller 22, so that the film is completely pulled off the stacking table and can be passed through the fixing bath in order to then be pushed back into the grippers on the forme cylinder, which rotates at a corresponding speed in order to tension the film on the forme cylinder.

Claims (7)

1. Device for exchanging printing formes in an offset printing press, including a pile table (2), decollating means for removing the formes from the pile table as well as forme transport and guide means by which the new forme to be mounted to the forme cylinder (3) of the offset printing machine is guided from the decollating means through an etchant or fixative container (26) and towards the forme cylinder and by which the used forme is transported from the forme cylinder into a magazine (32), the decollating means comprising a rotatory suction roll (4) which is arranged at the partly open underside of the pile table (2), which engages the bottom side of the pile and whose axis is parallel to the front edge of the forme pile, wherein the suction roll is adapted to undergo linear shifting parallel to the bottom side of the pile and to form, in the rear dead center position and in conjunction with a conveyor roll (22), a conveyor roll nip through which the forme is passed into the etchant or fixative container arranged immediately below the forme pile and the decollating means.
2. Forme exchanging device according to claim 1, wherein the shaft of the suction roll (4) is supported in a slide bar (8) of a crank mechanism (6), the rotation of the suction roll (4) being derived from a rack that is stationary on the machine frame (14) and that engages a gear wheel (10) attached to the suction roll shaft.
3. Forme exchanging device according to claim 2, wherein the diameter of the suction roll corresponds to the reference diameter of the gear wheel (10) and wherein the linear displacement of the suction roll (4) corresponds to at least half its laid-out periphery.
4. Forme exchanging device according to any one of claims 1 to 3, wherein in an axial direction, the suction roll (4) is divided into a plurality of suction roll portions (5) having rollers (16) therebetween which are freely rotatable relative to the suction roll portions, which are of substantially identical diameters and which form, along with a conveyor roll (22) that is parallel to said axis, a conveyor roll nip in the region of the rear end point of the linear displacement for receiving the lowermost forme which is partly peeled off the bottom side of the pile.
5. Forme exchanging device according to claim 4, wherein there is a guide rail structure (24) of semi-circular cross section leading from the conveyor roll nip into the fixative container (26) and from there to a pair of conveyor rolls (27, 28) arranged at the container edge adjacent the forme cylinder (3).
6. Forme exchanging device according to any one of the preceding claims, wherein the interior of the suction roll (4) that is adapted to reciprocate is connected, in a pressure sealed manner, via a hollow piston rod (20) to the interior of a stationary pump cylinder (19) inside which a pump piston (18) connected to the piston rod (20) is shiftable in order to generate the aspirating vacuum for the suction roll (4).
7. Forme exchanging device according to claim 6, wherein the pump cylinder (19) is, by a suitably disposed breather bore (21), adapted to be flow- connected to atmosphere in a position near the lower dead center of the pump piston (18) (corresponding to the rear dead center position of the slide bar 8).
EP83110721A 1982-10-26 1983-10-26 Device for exchanging printing formes in an offset printing press Expired EP0110138B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83110721T ATE40080T1 (en) 1982-10-26 1983-10-26 FOIL CHANGER FOR OFFSET PRINTING MACHINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3239580 1982-10-26
DE19823239580 DE3239580A1 (en) 1982-10-26 1982-10-26 FILM CHANGER FOR OFFSET PRINTING MACHINES

Publications (3)

Publication Number Publication Date
EP0110138A2 EP0110138A2 (en) 1984-06-13
EP0110138A3 EP0110138A3 (en) 1985-05-15
EP0110138B1 true EP0110138B1 (en) 1989-01-18

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EP83110721A Expired EP0110138B1 (en) 1982-10-26 1983-10-26 Device for exchanging printing formes in an offset printing press

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US (1) US4507167A (en)
EP (1) EP0110138B1 (en)
JP (1) JPS59131461A (en)
AT (1) ATE40080T1 (en)
DE (2) DE3239580A1 (en)

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DE4213472C2 (en) * 1992-04-24 1994-05-26 Heidelberger Druckmasch Ag Device for conveying 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
US5655452A (en) * 1996-08-07 1997-08-12 Agfa Division, Bayer Corp. Method and apparatus for an automated plate handler with slip sheet removal mechanism
US20030202081A1 (en) * 2002-04-29 2003-10-30 Peter Marten Apparatus for producing a printing form
WO2003093010A1 (en) 2002-04-29 2003-11-13 Heidelberger Druckmaschinen Ag Device for producing a printing block
RU2236876C1 (en) * 2003-07-21 2004-09-27 Закрытое акционерное общество "СИЛЭН" Fire-extinguishing plant
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US20080188826A1 (en) * 2007-02-01 2008-08-07 Laurimed, Llc Methods and devices for treating tissue
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US8685052B2 (en) 2010-06-30 2014-04-01 Laurimed, Llc Devices and methods for cutting tissue
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CH607977A5 (en) * 1976-06-18 1978-12-15 Fritz Lang Device for removing paper sheets from a stack, in particular on a folding machine
JPS5442202A (en) * 1977-08-01 1979-04-04 Ricoh Kk Etching device for offset printer

Also Published As

Publication number Publication date
ATE40080T1 (en) 1989-02-15
DE3378968D1 (en) 1989-02-23
DE3239580A1 (en) 1984-04-26
US4507167A (en) 1985-03-26
JPS59131461A (en) 1984-07-28
EP0110138A3 (en) 1985-05-15
EP0110138A2 (en) 1984-06-13

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