EP0567753B1 - Holding device for a movable plate - Google Patents
Holding device for a movable plate Download PDFInfo
- Publication number
- EP0567753B1 EP0567753B1 EP93104229A EP93104229A EP0567753B1 EP 0567753 B1 EP0567753 B1 EP 0567753B1 EP 93104229 A EP93104229 A EP 93104229A EP 93104229 A EP93104229 A EP 93104229A EP 0567753 B1 EP0567753 B1 EP 0567753B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- printing
- holding device
- suction
- self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/08—Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F27/00—Devices for attaching printing elements or formes to supports
- B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
- B41F27/1206—Feeding to or removing from the forme cylinder
Definitions
- the invention relates to a holding device for a plate to be moved old a suction cup, which has a sealing, elastic suction lip, which closes a volume when pressing the plate.
- Suction cups are well known, for example as holders on tiles of a wall. Such suction cups can also be firmly anchored to hold a plate. However, if such a plate is to be moved and at the same time held by the suction cup, it is necessary to guide the suction cup in a guide with the plate. To release the connection between the suction cup and the plate, it is necessary to apply a force which is greater than the holding force of the suction cup, or one must provide ventilation, for example by means of a valve, which aerates the volume of the suction cup.
- a suction cup is described in GB 10 06 042. On the one hand, it is used for gripping and on the other hand for moving paper sheets from stacks.
- the suction cup consists of a cylindrical part, on the underside of which a truncated cone-shaped suction head is attached.
- the inside of the suction head has circular projections.
- the suction head ends old on an outer edge.
- EP-A 0 095 218 shows a suction cup for holding objects, which provides ventilation by means of a valve to release a holding force.
- EP 0 431 575 A2 already discloses suction cups for holding printing plates in one Insert pressure plate feeder.
- the suction cups provided are slidably guided in a guide together with the pressure plate.
- the invention has for its object to make available a holding device of the type mentioned that a plate to be moved in the desired position without using an increased force or Venting channel with controlled valve automatically releases.
- the suction lip consists of a material with good sliding properties and that the plate has a bore, the bore and suction cup being arranged such that the bore in a plate position in which the holding device is released is supposed to happen, the suction lip by moving the plate.
- the holding device is simple and extremely inexpensive to manufacture. Handling is simple and convenient with a high level of functional reliability.
- a particularly advantageous application is the holding of printing plates which are to be fed to a plate cylinder of a printing press.
- the printer puts the printing plate with its front edge into a clamping device and presses the printing plate with its non-printing side against the suction cup of the holding device.
- the machine pulls in the pressure plate, sliding past the holding device until a hole in the pressure plate passes the suction lip.
- Such bores are present anyway at the end of a printing plate, since they are used for the plate copy or for punching U-shaped recesses for positioning the printing plates.
- the holding device releases and the pressure plate can be drawn further into the machine.
- This independent release is required for printing plates which are angled at their rear edge for the purpose of clamping and clamping on the plate cylinder. Venting through the hole ensures that the pressure plate is released in time so that it can be drawn into the machine. After the pressure plate is released from the holding element, it falls down a bit due to its weight, so that the angled rear edge can slide past the holding element.
- a suction cup or a row of suction cups can be arranged. Whereby several suction cups can also be arranged in the drawing-in direction of the pressure plate, which release the pressure plate one after the other. This is particularly useful for large printing plates in order to guide and hold them securely.
- the pressure plate After approval by the last or the only holding element, the pressure plate is caught by a pressure element, which at the same time serves to insert the rear edge of the pressure plate into the corresponding device of the plate cylinder.
- the pressure element is arranged in such a way that it is located with a small lateral offset at the lower end of the straight line, which in the plate changing position between the clamping surfaces of the device for receiving the pressure plate leading edge leads to the suction cup or the suction cups.
- a printing unit protection which is present anyway and which has to be folded up to change the printing plate.
- a printing unit protection consists of two parts connected by a joint, the lower part being guided in a guide which has a stop at its upper end. The upper part of the printing unit protection is connected to a lever which is mounted on the printing unit. After folding up the printing unit protection, the lower part of the printing unit protection lies in the guide against a stop and the upper part of the printing unit protection is connected to a gas pressure spring, which ensures that the printing unit protection assumes a fixed position when folded up. If the printing unit protection is folded down, the angular relationships change and as a result the printing unit protection keeps the gas pressure spring in its compressed state. This is achieved in that the printing unit, the gas pressure spring and part of the lever form a triangle, which has different angular relationships due to the folding down of the printing unit protection and as a result the forces acting on the gas pressure spring are also changed.
- the holding force for the pressure plate must be dimensioned accordingly.
- the required holding force depends on the nature of the Pressure plate.
- the size of the holding force can be adjusted by means of the diameter of the suction lip of the suction cup and by dimensioning the pressure conditions. In this case, the holding force is increased by increasing the underpressure achieved and by increasing the diameter of the suction lip of the suction cup.
- the size of the vacuum depends on the size of the volume and the amount of air escaping when the suction head is pressed.
- the holding force must be at least so great that it is sufficient to hold the plate, but at most it must be so great that the suction lip can still slide on the plate.
- volume can be variably adjusted in accordance with the desired holding force. In this way it is possible to adapt a holding device to different pressure plates, which require a different holding force due to their weight and their surface condition.
- the holding device can be designed such that the volume is molded into a solid body and that the elastic suction lip is attached to the solid body.
- the variable volume can be achieved in that the solid body is designed as a piston-cylinder unit, the volume being adjustable by the position of the piston.
- the piston must be designed so that its setting can be locked, or so that the setting is no longer adjusted. This can be done, for example, in that a threaded spindle passes through the solid body to the outside and can be rotated from the outside. This also enables readjustment during operation.
- the size of the holding force is also influenced by the amount of air when the plates are pressed onto the suction cup escapes. Therefore, a further development provides that a precisely defined holding force is achieved within a narrow tolerance range in that a defined distance is provided between the edge of the suction lip in the non-suctioned state and the solid body, and that the suction lip is deformable in this way when the plate is pressed on that the solid body strikes the plate. By dimensioning the distance, the negative pressure achieved in the volume, which arises when the plate is pressed on, can be specified in accordance with the desired holding force.
- rubber with a hardness of 40-45 Shore can be provided for the suction lip.
- Figure 1 shows a suction cup 1, which is attached to a fixed machine part and to which a plate 2 has been pressed for holding.
- the suction lip 3 is elastic and seals the volume 4 of the suction cup 1.
- air has escaped from the volume 4, creating a negative pressure for holding the plate 2.
- the plate 2 is moved in the direction of arrow 6.
- a bore 5 is provided in the plate.
- the suction cup 1 and the bore 5 are arranged such that the bore 5 passes through the displacement 6 of the plate 2 in a plate position in which the holding device is to release.
- the volume 4 is thereby vented and the suction cup 1 detaches from the plate 2.
- the holding force is determined by the diameter D of the suction lip 3 and by the negative pressure in the volume 4.
- the negative pressure and the size of the volume 4 also depend on how strongly the plate 2 is pressed onto the suction cup 1.
- a small volume 4 which is greatly increased by a force that pulls the plate 2 vertically away from the suction cup 1, brings the greatest negative pressure and thus the greatest holding force.
- FIG. 2 shows an embodiment in which the volume 4 is molded into a solid body 7.
- the suction cup consists of a funnel-shaped part which is attached to the solid body 7.
- the holding device has been pressed against the plate 2 so far that the solid body 7 strikes the plate 2.
- the distance a (FIG. 3) between the edge of the suction lip 3 in the non-suctioned state and the solid body 7 being overcome.
- This reproducible setting is important because, if the holding force is too great, the sliding resistance of the suction cup on the plate becomes too great, but on the other hand a holding force must be guaranteed which holds the plate securely.
- FIG. 2 shows, as plate 2, a pressure plate which has an angle at its end over which the Holding device can not slide away. It is therefore necessary that the suction cup 1 releases the pressure plate before it reaches its end region. This is ensured by the bore 5 of the printing plate, which is present anyway for creating the plate copy or for punching further recesses in printing plates.
- the area of application is not limited to printing plates, other plates can also be held in this way up to a predetermined position.
- Figure 3 shows a development with a volume 4, which is formed in the solid body 7 as a piston-cylinder unit.
- the volume 4 is adjusted by the position of the piston 9.
- the setting can be made, for example, by means of a threaded spindle. It has the advantage that the desired holding force can be varied. With a corresponding configuration, the setting can also be carried out during operation.
- the adjustable volume 4 allows plates of different weights and different surface properties to be held in such a way that they are guided safely and the suction lip 3 nevertheless glides easily on the plate 2.
- FIG 4 shows an application of the holding device.
- the suction cups 1 are arranged on a lower part 22 of the printing unit protection 15, this part of the printing unit protection being oriented such that the suction cup 1 or the suction cups 1 assume a position in which they lie on a straight line which is parallel to the clamping surfaces 18 of the Device 13 for clamping the front edge of the printing plate 2 'runs, passes between these clamping surfaces and thereby leads out of the printing unit 11 obliquely upwards.
- a certain position of the plate cylinder 10 is necessary for this, in which the clamping surfaces 18 the device 12 for tightening the front edge of the pressure plate 2 'of this straight line are aligned accordingly.
- the lower part 22 of the printing unit protection 15 is guided in a guide 16 which has a stop 17.
- the printing unit protection 15 is held by a lever 20 which is connected to the printing unit 11 by a bearing 21.
- the lever 20 is in turn with an upper part of the printing unit protection 23 in fixed, angled connections.
- a gas pressure spring 19 is arranged between the lever 20 and the printing unit 11.
- FIG. 4 two suction cups 1 are shown on the lower part of the printing unit protection 22, the upper suction cup being vented when the bore 5 of the pressure plate 2 reaches it. The upper suction cup 1 releases the plate 2. The unwound rear edge of the pressure plate 2 'slides past the suction cup 1, which has released it, because its weight causes it to drop a little and thereby moves a small distance away from the suction cup 1.
- the pressure plate 2 ' is wound further around the plate cylinder 10 and the bore 5 reaches the second, lower suction cup 1, whereby this is also vented and releases the pressure plate 2 '.
- the pressure plate 2 ' falls down, being caught and guided by a pressure element 25.
- the printing plate is completely wound around the plate cylinder 10 and inserted, clamped and tensioned in the device 13 for tightening the rear edge of the printing plate 2 'by means of the pressing element 25.
- the printing plate trailing edge is inserted by a radial movement of the pressing element 25 in the direction of the plate cylinder 10.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
- Screen Printers (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
Description
Die Erfindung betrifft eine Halteeinrichtung für eine zu verschiebende Platte alt einem Saugnapf, der eine abdichtende, elastische Sauglippe aufweist, welche beim Andrücken der Platte ein Volumen abschließt.The invention relates to a holding device for a plate to be moved old a suction cup, which has a sealing, elastic suction lip, which closes a volume when pressing the plate.
Saugnäpfe sind hinlänglich bekannt, beispielsweise als Halterungen auf Fliesen einer Wand. Derartige Saugnäpfe können auch fest verankert werden, um eine Platte zu halten. Soll eine solche Platte jedoch verschoben und gleichzeitig durch den Saugnapf gehalten werden, ist es notwendig den Saugnapf in einer Führung mit der Platte verschiebbar zu führen. Zum Lösen der Verbindung von Saugnapf und Platte ist es notwendig, eine Kraft aufzubringen, die größer ist als die Haltekraft des Saugnapfes, oder man muß eine Entlüftung, beispielsweise mittels eines Ventils, vorsehen, die das Volumen des Saugnapfs belüftet.Suction cups are well known, for example as holders on tiles of a wall. Such suction cups can also be firmly anchored to hold a plate. However, if such a plate is to be moved and at the same time held by the suction cup, it is necessary to guide the suction cup in a guide with the plate. To release the connection between the suction cup and the plate, it is necessary to apply a force which is greater than the holding force of the suction cup, or one must provide ventilation, for example by means of a valve, which aerates the volume of the suction cup.
Beispielsweise ist in der GB 10 06 042 ein Saugnapf beschrieben. Er dient einerseits zum Greifen und andererseits zum Vorwärtsbewegen von Papierbogen von Stapeln. Der Saugnapf besteht aus einem zylindrischen Teil, an dessen Unterseite ein kegelstumpfförmiger Saugkopf angebracht ist. Die Innenseite des Saugkopfes weist kreisförmige Vorsprünge auf. Der Saugkopf endet alt einem äußeren Rand.For example, a suction cup is described in
Die EP-A 0 095 218 zeigt einen Saugnapf zum Halten von Gegenständen, der zum Lösen einer Haltekraft eine Entlüftung mittels eines Ventils vorsieht.EP-A 0 095 218 shows a suction cup for holding objects, which provides ventilation by means of a valve to release a holding force.
Durch die EP 0 431 575 A2 ist es bereits bekannt, Saugnäpfe zum Halten von Druckplatten in einer Druckplattenzuführvorrichtung einzusetzen. Die vorgesehenen Saugnäpfe sind hierbei in einer Führung zusammen mit der Druckplatte verschiebbar geführt.EP 0 431 575 A2 already discloses suction cups for holding printing plates in one Insert pressure plate feeder. The suction cups provided are slidably guided in a guide together with the pressure plate.
Der Erfindung liegt die Aufgabe zugrunde, eine Halteeinrichtung der eingangsgenannten Art verfügbar zu machen, die eine zu verschiebende Platte in der gewünschten Position ohne Einsatz einer erhöhten Kraft oder eines Entlüftungskanals mit gesteuertem Ventil selbsttätig freigibt.The invention has for its object to make available a holding device of the type mentioned that a plate to be moved in the desired position without using an increased force or Venting channel with controlled valve automatically releases.
Die Aufgabe wird erfindungsgemäß dadadurch gelöst, daß die Sauglippe aus einem Material mit guten Gleiteigenschaften besteht und daß die Platte eine Bohrung aufweist, wobei Bohrung und Saugnapf derart angeordnet sind, daß die Bohrung in einer Plattenposition, in der die Halteeinrichtung lösen soll, die Sauglippe durch die Verschiebung der Platte passiert.The object is achieved in that the suction lip consists of a material with good sliding properties and that the plate has a bore, the bore and suction cup being arranged such that the bore in a plate position in which the holding device is released is supposed to happen, the suction lip by moving the plate.
Die Vorteile der Erfindung bestehen darin, daß die Halteeinrichtung einfach aufgebaut und äußerst kostengünstig herstellbar ist. Die Handhabung ist einfach und bequem bei hoher Funktionssicherheit.The advantages of the invention are that the holding device is simple and extremely inexpensive to manufacture. Handling is simple and convenient with a high level of functional reliability.
Ein besonders vorteilhafter Anwendungsfall ist das Halten von Druckplatten, die einem Plattenzylinder einer Druckmaschine zugeführt werden sollen. Dazu steckt der Drucker die Druckplatte mit ihrer Vorderkante in eine Klemmeinrichtung und drückt die Druckplatte mit ihrer nicht druckenden Seite an den Saugnapf der Halteeinrichtung. Die Maschine zieht die Druckplatte ein, wobei sie an der Halteeinrichtung vorbeigleitet, bis eine Bohrung in der Druckplatte die Sauglippe passiert. Solche Bohrungen sind am Ende einer Druckplatte ohnehin vorhanden, da sie für die Plattenkopie bzw. für das Stanzen U-förmiger Ausnehmungen zum Positionieren der Druckplatten gebraucht werden. Durch die Entlüftung mit Hilfe dieser Bohrung löst die Halteeinrichtung und die Druckplatte kann weiter in die Maschine eingezogen werden. Dieses selbständige Lösen ist bei Druckplatten erforderlich, welche an ihrem hinteren Rand zum Zweck des Festklemmens und Spannens auf dem Plattenzylinder abgewinkelt sind. Die Entlüftung mittels der Bohrung sorgt also für eine rechtzeitige Freigabe der Druckplatte, damit diese in die Maschine eingezogen werden kann. Nachdem die Druckplatte vom Halteelement freigegeben ist, fällt sie durch ihr Gewicht ein Stück nach unten, so daß die abgewinkelte Hinterkante am Halteelement vorbeigleiten kann. Es kann ein Saugnapf oder eine Reihe von Saugnäpfen angeordnet sein. Wobei auch in Einziehrichtung der Druckplatte mehrere Saugnäpfe angeordnet werden können, die die Druckplatte nacheinander freigeben. Dies ist insbesondere bei großen Druckplatten zweckmäßig, um diese sicher zu führen und zu halten. Nach der Freigabe durch das letzte bzw. das einzige Halteelement wird die Druckplatte durch ein Andrückelement aufgefangen, welches gleichzeitig zum Einfügen der Hinterkante der Druckplatte in die entsprechende Einrichtung des Plattenzylinders dient. Das Andrückelement ist derart angeordnet, daß es sich mit geringer seitlicher Versetzung am unteren Ende der Geraden befindet, die in der Plattenwechselposition zwischen den Klemmflächen der Einrichtung zur Aufnahme der Druckplattenvorderkante verlaufend zu dem Saugnapf bzw. den Saugnäpfen führt.A particularly advantageous application is the holding of printing plates which are to be fed to a plate cylinder of a printing press. For this purpose, the printer puts the printing plate with its front edge into a clamping device and presses the printing plate with its non-printing side against the suction cup of the holding device. The machine pulls in the pressure plate, sliding past the holding device until a hole in the pressure plate passes the suction lip. Such bores are present anyway at the end of a printing plate, since they are used for the plate copy or for punching U-shaped recesses for positioning the printing plates. By venting with the help of this hole, the holding device releases and the pressure plate can be drawn further into the machine. This independent release is required for printing plates which are angled at their rear edge for the purpose of clamping and clamping on the plate cylinder. Venting through the hole ensures that the pressure plate is released in time so that it can be drawn into the machine. After the pressure plate is released from the holding element, it falls down a bit due to its weight, so that the angled rear edge can slide past the holding element. A suction cup or a row of suction cups can be arranged. Whereby several suction cups can also be arranged in the drawing-in direction of the pressure plate, which release the pressure plate one after the other. This is particularly useful for large printing plates in order to guide and hold them securely. After approval by the last or the only holding element, the pressure plate is caught by a pressure element, which at the same time serves to insert the rear edge of the pressure plate into the corresponding device of the plate cylinder. The pressure element is arranged in such a way that it is located with a small lateral offset at the lower end of the straight line, which in the plate changing position between the clamping surfaces of the device for receiving the pressure plate leading edge leads to the suction cup or the suction cups.
Besonders zweckmäßig ist es dabei, den Saugnapf oder die Saugnäpfe an einem Druckwerkschutz zu befestigen, der ohnehin vorhanden ist und der zum Druckplattenwechsel hochgeklappt werden muß. Ein solcher Druckwerkschutz besteht aus zwei mit einem Gelenk verbundenen Teilen, wobei das untere Teil in einer Führung geführt ist, welche an ihrem oberen Ende einen Anschlag aufweist. Das obere Teil des Druckwerkschutzes ist mit einem Hebel verbunden, der am Druckwerk gelagert ist. Nach dem Hochklappen des Druckwerkschutzes liegt das untere Teil des Druckwerkschutzes in der Führung an einem Anschlag an und das obere Teil des Druckwerkschutzes ist mit einer Gasdruckfeder verbunden, die dafür sorgt, daß der Druckwerkschutz im hochgeklappten Zustand eine feste Position einnimmt. Wird der Druckwerkschutz heruntergeklappt, verändern sich die Winkelverhältnisse und dadurch hält der Druckwerkschutz die Gasdruckfeder in ihrem zusammengepreßten Zustand. Dies wird dadurch erreicht, daß das Druckwerk, die Gasdruckfeder und ein Teil des Hebels ein Dreieck bilden, welches durch das Herunterklappen des Druckwerkschutzes andere Winkelverhältnisse aufweist und dadurch auch die auf die Gasdruckfeder wirkenden Kräfte verändert sind.It is particularly expedient to attach the suction cup or the suction cups to a printing unit protection which is present anyway and which has to be folded up to change the printing plate. Such a printing unit protection consists of two parts connected by a joint, the lower part being guided in a guide which has a stop at its upper end. The upper part of the printing unit protection is connected to a lever which is mounted on the printing unit. After folding up the printing unit protection, the lower part of the printing unit protection lies in the guide against a stop and the upper part of the printing unit protection is connected to a gas pressure spring, which ensures that the printing unit protection assumes a fixed position when folded up. If the printing unit protection is folded down, the angular relationships change and as a result the printing unit protection keeps the gas pressure spring in its compressed state. This is achieved in that the printing unit, the gas pressure spring and part of the lever form a triangle, which has different angular relationships due to the folding down of the printing unit protection and as a result the forces acting on the gas pressure spring are also changed.
Für eine optimale Funktionssicherheit muß die Haltekraft für die Druckplatte entsprechend dimensioniert sein. Die erforderliche Haltekraft hängt von der Beschaffenheit der Druckplatte ab. Die Größe der Haltekraft kann mittels des Durchmessers der Sauglippe des Saugnapfs und durch die Bemessung der Druckverhältnisse eingestellt werden. Dabei wird eine Vergrößerung der Haltekraft durch eine Vergrößerung des erzielten Unterdrucks, sowie durch eine Vergrößerung des Durchmessers der Sauglippe des Saugnapfs erzielt. Die Größe des Unterdrucks richtet sich nach der Größe des Volumens und der Menge der durch das Andrücken des Saugkopfes entwichenen Luft. Die Haltekraft muß mindestens so groß sein, daß sie für das Halten der Platte ausreicht, sie darf jedoch höchstens so groß sein, daß ein Gleiten der Sauglippe auf der Platte noch möglich ist.For optimum functional reliability, the holding force for the pressure plate must be dimensioned accordingly. The required holding force depends on the nature of the Pressure plate. The size of the holding force can be adjusted by means of the diameter of the suction lip of the suction cup and by dimensioning the pressure conditions. In this case, the holding force is increased by increasing the underpressure achieved and by increasing the diameter of the suction lip of the suction cup. The size of the vacuum depends on the size of the volume and the amount of air escaping when the suction head is pressed. The holding force must be at least so great that it is sufficient to hold the plate, but at most it must be so great that the suction lip can still slide on the plate.
Eine Weiterbildung sieht vor, daß das Volumen entsprechend der gewünschten Haltekraft variabel einstellbar ist. Auf diese Weise ist es möglich, eine Halteeinrichtung an verschiedene Druckplatten, welche wegen ihres Gewichts und ihrer Oberflächenbeschaffenheit eine unterschiedliche Haltekraft benötigen, anzupassen.A further development provides that the volume can be variably adjusted in accordance with the desired holding force. In this way it is possible to adapt a holding device to different pressure plates, which require a different holding force due to their weight and their surface condition.
Die Halteeinrichtung kann derart ausgestaltet sein, daß das Volumen in einen festen Körper eingeformt ist und daß die elastische Sauglippe an den festen Körper angefügt ist. Bei einer derartigen Weiterbildung läßt sich das variable Volumen dadurch erzielen, daß der feste Körper als Kolben-Zylinder-Einheit ausgebildet ist, wobei das Volumen durch die Position des Kolbens einstellbar ist. Der Kolben muß dabei so ausgebildet sein, daß seine Einstellung arretierbar ist, beziehungsweise so, daß sich die Einstellung nicht mehr verstellt. Dies kann beispielsweise dadurch erfolgen, daß eine Gewindespindel den festen Körper nach außen durchsetzt und von außen gedreht werden kann. Dadurch ist auch eine Nachjustierung während des Betriebs möglich.The holding device can be designed such that the volume is molded into a solid body and that the elastic suction lip is attached to the solid body. In such a development, the variable volume can be achieved in that the solid body is designed as a piston-cylinder unit, the volume being adjustable by the position of the piston. The piston must be designed so that its setting can be locked, or so that the setting is no longer adjusted. This can be done, for example, in that a threaded spindle passes through the solid body to the outside and can be rotated from the outside. This also enables readjustment during operation.
Für die Größe der Haltkraft ist desweiteren von Einfluß, wieviel Luft beim Andrücken der Platten an den Saugnapf entweicht. Daher sieht eine Weiterbildung vor, daß eine genau definierte Haltekraft innerhalb eines engen Toleranzbereichs dadurch erzielt wird, daß ein definierter Abstand zwischen dem Rand der Sauglippe im nicht angesaugten Zustand und dem festen Körper vorgesehen ist, und daß beim Andrücken der Platte die Sauglippe derart verformbar ist, daß der feste Körper an die Platte anschlägt. Durch die Bemessung des Abstandes kann der im Volumen erzielte Unterdruck, der beim Andrücken der Platte entsteht, entsprechend der gewünschten Haltekraft vorgegeben werden.The size of the holding force is also influenced by the amount of air when the plates are pressed onto the suction cup escapes. Therefore, a further development provides that a precisely defined holding force is achieved within a narrow tolerance range in that a defined distance is provided between the edge of the suction lip in the non-suctioned state and the solid body, and that the suction lip is deformable in this way when the plate is pressed on that the solid body strikes the plate. By dimensioning the distance, the negative pressure achieved in the volume, which arises when the plate is pressed on, can be specified in accordance with the desired holding force.
Als Material mit guten Gleiteigenschaften kann für die Sauglippe Gummi mit einer Härte von 40-45 Shore vorgesehen werden.As a material with good sliding properties, rubber with a hardness of 40-45 Shore can be provided for the suction lip.
Eine weitere Erläuterung der Erfindung erfolgt anhand in der Zeichnung dargestellter Ausführungsbeispiele.A further explanation of the invention takes place with reference to exemplary embodiments shown in the drawing.
Es zeigen
Figur 1- ein einfaches Ausführungsbeispiel,
Figur 2- ein Ausführungsbeispiel mit in einem festen Körper eingeformtem Volumen,
Figur 3- ein Ausführungsbeispiel mit einem variabel einstellbaren Volumen und
- Figur 4
- ein Anwendungsfall der Halteeinrichtung.
- Figure 1
- a simple embodiment,
- Figure 2
- an embodiment with a volume molded into a solid body,
- Figure 3
- an embodiment with a variably adjustable volume and
- Figure 4
- an application of the holding device.
Figur 1 zeigt einen Saugnapf 1, der an einem festen Maschinenteil befestigt ist und an den eine Platte 2 zum Halten angedrückt wurde. Die Sauglippe 3 ist elastisch und dichtet das Volumen 4 des Saugnapfs 1 ab. Beim Andrücken der Platte 2 ist Luft aus dem Volumen 4 entwichen, wodurch ein Unterdruck für das Halten der Platte 2 entstand. Die Platte 2 wird in Richtung des Pfeils 6 verschoben. In der Platte ist eine Bohrung 5 vorgesehen. Der Saugnapf 1 und die Bohrung 5 sind derart angeordnet, daß die Bohrung 5 in einer Plattenposition, in der die Halteeinrichtung lösen soll, die Sauglippe 3 durch die Verschiebung 6 der Platte 2 passiert. Dadurch wird das Volumen 4 entlüftet und der Saugnapf 1 löst sich von der Platte 2. Die Haltekraft wird durch den Durchmesser D der Sauglippe 3 sowie durch den Unterdruck im Volumen 4 bestimmt. Bei dieser einfachen Ausführungsform hängt der Unterdruck und die Größe des Volumens 4 mit davon ab, wie stark die Platte 2 an den Saugnapf 1 angedrückt wird. Ein kleines Volumen 4, das durch eine Kraft stark vergrößert wird, welche die Platte 2 senkrecht vom Saugnapf 1 wegzieht, bringt den größten Unterdruck und damit die größte Haltekraft.Figure 1 shows a
Figur 2 zeigt eine Ausführungsform, bei der das Volumen 4 in einen festen Körper 7 eingeformt ist. Der Saugnapf besteht aus einem trichterförmigen Teil, das an den festen Körper 7 angefügt ist. In Figur 2 ist ersichtlich, daß die Halteeinrichtung so weit an die Platte 2 angepreßt wurde, daß der feste Körper 7 an die Platte 2 anschlägt. Beim Andrücken der Platte 2 an den Saugnapf 1 wurde dieser entsprechend verformt, wobei der Abstand a (Fig. 3) zwischen dem Rand der Sauglippe 3 im nicht angesaugten Zustand und dem festen Körper 7 überwunden wurde. Auf diese Weise entweicht eine genau definierte Menge Luft und die Haltekraft kann auf diese Weise innerhalb eines engen Toleranzbereichs reproduzierbar vorgegeben werden. Diese reproduzierbare Einstellung ist deshalb von Bedeutung, weil bei einer zu großen Haltekraft der Gleitwiderstand des Saugnapfes auf der Platte zu groß wird, andererseits aber eine Haltekraft gewährleistet sein muß, die die Platte sicher hält.Figure 2 shows an embodiment in which the volume 4 is molded into a
Figur 2 zeigt als Platte 2 eine Druckplatte, die an ihrem Ende eine Abwinkelung aufweist, über welche die Halteeinrichtung nicht hinweggleiten kann. Darum ist es erforderlich, daß der Saugnapf 1 die Druckplatte vor dem Erreichen ihres Endbereichs freigibt. Dafür sorgt die Bohrung 5 der Druckplatte, welche zur Erstellung der Plattenkopie beziehungsweise für das Stanzen weiterer Ausnehmungen bei Druckplatten ohnehin vorhanden ist. Selbstverständlich ist der Anwendungsbereich nicht auf Druckplatten beschränkt, es können auch andere Platten auf diese Weise bis zu einer vorbestimmten Position gehalten werden.FIG. 2 shows, as
Figur 3 zeigt eine Weiterbildung mit einem Volumen 4, das in dem festen Körper 7 als Kolben-Zylinder-Einheit ausgebildet ist. Bei dieser Ausführungsform wird das Volumen 4 durch die Position des Kolbens 9 eingestellt. Die Einstellung kann beispielsweise mittels einer Gewindespindel erfolgen. Sie hat den Vorteil, daß sich die gewünschte Haltekraft variieren läßt. Bei einer entsprechenden Ausgestaltung kann die Einstellung auch während des Betriebs vorgenommen werden. Durch das verstellbare Volumen 4 lassen sich Platten verschiedenen Gewichts und verschiedener Oberflächenbeschaffenheit so halten, daß sie sicher geführt werden und die Sauglippe 3 trotzdem leicht auf der Platte 2 gleitet.Figure 3 shows a development with a volume 4, which is formed in the
Figur 4 zeigt einen Anwendungsfall der Halteeinrichtung. Die Saugnäpfe 1 sind an einem unteren Teil 22 des Druckwerkschutzes 15 angeordnet, wobei dieses Teil des Druckwerkschutzes so ausgerichtet ist, daß der Saugnapf 1 oder die Saugnäpfe 1 eine Position einnehmen, in der sie auf einer Geraden liegen, welche paralell zu den Klemmflächen 18 der Einrichtung 13 zum Festspannen der Vorderkante der Druckplatte 2' verläuft, zwischen diesen Klemmflächen hindurchführt und dabei schräg nach oben aus dem Druckwerk 11 herausführt. Dazu ist eine bestimmte Position des Plattenzylinders 10 notwendig, bei der die Klemmflächen 18 der Einrichtung 12 zum Festspannen der Vorderkante der Druckplatte 2' dieser Geraden entsprechend ausgerichtet sind.Figure 4 shows an application of the holding device. The suction cups 1 are arranged on a
Das untere Teil 22 des Druckwerkschutzes 15 ist in einer Führung 16 geführt, die einen Anschlag 17 aufweist. In der dargestellten hochgeklappten Stellung des Druckwerkschutzes 15, die der Plattenwechselposition entspricht, wird der Druckwerkschutz 15 durch einen Hebel 20 gehalten, der durch eine Lagerung 21 mit dem Druckwerk 11 verbunden ist. Der Hebel 20 steht wiederum mit einem oberen Teil des Druckwerkschutzes 23 in festen, einen Winkel bildenden Verbindungen. Zwischen dem Hebel 20 und dem Druckwerk 11 ist eine Gasdruckfeder 19 angeordnet. Die Gasdruckfeder 19, der Teil des Hebels 20 bis zum Lagerpunkt für die Gasdruckfeder 19 und das Druckwerk 11, bilden ein Dreieck, welches unter Zusammendrückung der Gasdruckfeder 19 beim Zuklappen des Druckwerkschutzes 15 derart verändert wird, daß der obere Winkel dieses Dreiecks fast ein 180°-Winkel wird. Dadurch wird der Hebel, welcher für die Gasdruckfeder 19 zum Aufstellen des Druckwerkschutzes zur Verfügung steht sehr klein und die Gasdruckfeder 19 bleibt in ihrem zusammengedrückten Zustand. In der Figur 4 sind am unteren Teil des Druckwerkschutzes 22 zwei Saugnäpfe 1 dargestellt, wobei der obere Saugnapf dann entlüftet, wenn die Bohrung 5 der Druckplatte 2 ihn erreicht. Der obere Saugnapf 1 läßt die Platte 2 los. Die abgewickelte Hinterkante der Druckplatte 2' gleitet an dem Saugnapf 1, der sie freigegeben hat, vorbei, weil sie durch ihr Gewicht etwas nach unten fällt und sich dadurch ein kleines Stück von Saugnapf 1 entfernt. Dies gilt sowohl bei der Anordnung eines Saugnapfes bzw. einer horizontalen Saugnapfreihe als auch bei der Anordnung mehrerer vertikaler Saugnäpfe bzw. Saugnapfreihen, die übereinander angeordnet sind, und daher zeitlich versetzt außer Eingriff kommen. Die Druckplatte 2' wird weiter um den Plattenzylinder 10 gewickelt und dabei erreicht die Bohrung 5 den zweiten, unteren Saugnapf 1, wodurch auch dieser entlüftet wird und die Druckplatte 2' freigibt. Die Druckplatte 2' fällt nach unten, wobei sie von einem Andrückelement 25 aufgefangen und geführt wird. Die Druckplatte wird vollends um den Plattenzylinder 10 gewickelt und in die Einrichtung 13 zum Festspannen der Hinterkante der Druckplatte 2' mittels des Andrückelements 25 eingefügt, geklemmt und gespannt. Das Einfügen der Druckplattenhinterkante erfolgt durch eine radiale Bewegung des Andrückelements 25 in Richtung des Plattenzylinders 10.The
- 11
- Saugnapfsuction cup
- 22nd
- Platteplate
- 2'2 '
- Druckplatteprinting plate
- 33rd
- SauglippeSuction lip
- 44th
- Volumenvolume
- 55
- Bohrungdrilling
- 66
- Pfeil (Verschiebung der Platte)Arrow (displacement of the plate)
- 77
- fester Körpersolid body
- 88th
- Kolben-Zylinder-EinheitPiston-cylinder unit
- 99
- Kolbenpiston
- 1010th
- PlattenzylinderPlate cylinder
- 1111
- DruckwerkPrinting unit
- 1212th
- Einrichtung zum Festspannen der Vorderkante von DruckplattenDevice for clamping the leading edge of printing plates
- 1313
- Einrichtung zum Festspannen der Hinterkante von DruckplattenDevice for clamping the rear edge of printing plates
- 1414
- Hinterkante der DruckplatteTrailing edge of the pressure plate
- 1515
- hochklappbarer Druckwerkschutzfoldable printing unit protection
- 1616
- Führungguide
- 1717th
- Anschlagattack
- 1818th
- Klemmflächen der Einrichtung zum Festspannen der Vorderkante der DruckplatteClamping surfaces of the device for clamping the front edge of the pressure plate
- 1919th
- GasdruckfederGas pressure spring
- 2020th
- Hebellever
- 2121
- Lagerung des Hebels am DruckwerkStorage of the lever on the printing unit
- 2222
- unteres Teil des Druckwerkschutzeslower part of the printing unit protection
- 2323
- oberes Teil des Druckwerkschutzesupper part of the printing unit protection
- 2424th
- Gelenkjoint
- 2525th
- AndrückelementPressing element
Claims (14)
- Holding device for a plate (2) to be displaced, with a suction cup (1) having a sealing-off elastic suction lip (3) which closes off a volume when the plate is pressed down, characterized in that the suction lip (3) consists of a material having good sliding properties, and in that the plate (2) has a bore (5), the bore (5) and suction cup (1) being arranged in such a way that, in a plate position in which the holding device is to be released, the bore (5) passes the suction lip (3) as a result of the displacement (6) of the plate (2).
- Self-releasing holding device according to Claim 1, characterized in that a diameter (D) and a volume (4) of the suction cup (1) are dimensioned in such a way that the holding force is sufficient for holding the plate (2) and allows the suction lip (3) to slide on the plate (2).
- Self-releasing holding device according to Claim 1 or 2, characterized in that the volume (4) is variably adjustable according to the desired holding force.
- Self-releasing holding device according to one or more of Claims 1 to 3, characterized in that the volume (4) is formed in a fixed body (7), and in that the elastic suction lip (3) is added to the fixed body (7).
- Self-releasing holding device according to one or more of Claims 1 to 4, characterized in that the volume (4) in the fixed body (7) is designed as a piston/cylinder unit (8), the volume (4) being adjustable as a result of the position of the piston (9).
- Self-releasing holding device according to one or more of Claims 1 to 5, characterized in that a spacing (a) is provided between the edge of the suction lip (3) in the non-suction state and the fixed body (7), and in that, when the plate (2) is pressed down, the suction lip (3) is deformable in such a way that the fixed body (7) butts against the plate (2).
- Self-releasing holding device according to Claim 6, characterized in that the spacing (a) is dimensioned in such a way that the vacuum necessary for the desired holding force is generated in the volume (4) when the plate (2) is pressed down.
- Self-releasing holding device according to one or more of Claims 1 to 7, characterized in that the suction lip (3) is made of rubber with a Shore hardness of 40 to 45.
- Self-releasing holding device according to one or more of Claims 1 to 8, characterized in that the holding device serves for holding a printing plate (2') which is to be fed to the plate cylinder (10) of a printing machine, at least one suction cup (1) being attached to at least one printing unit (11) of the printing machine, in such a way that the suction cup (1) assumes a position in which it is located essentially on a straight line which in the plate-changing position runs parallel to the clamping faces (18) of the appliance (12) for clamping the front edge of printing plates, passes through between these clamping faces (18) and comes out of the printing unit (11) obliquely upwards.
- Self-releasing holding device according to Claim 9, characterized in that at least one suction cup (1) is fastened to a swing-up printing-unit guard (15), the suction cup (1) being located essentially on the straight line in the swung-up state of the printing-unit guard (15).
- Self-releasing holding device according to Claim 10, characterized in that at least one suction cup (1) is attached to a lower part (22) of the printing-unit guard (15), and in that this lower part is mounted displaceably and pivotably at its lower end in a guide (16) and at its upper end is connected by means of a joint (24) to an upper part (23) of the printing-unit guard (15), this upper part being fastened, so as to form an angle, to a lever (20) which is connected to the printing unit (11) by means of a mounting (21), the guide (16) having a stop (17), by means of which the position of the suction cup (1) or suction cups (1) on the straight line is predetermined by the position of the lower part (22) of the printing-unit guard (15).
- Self-releasing holding device according to Claim 11, characterized in that there is arranged between the lever (20) and the printing unit (11) a pneumatic compression spring (19) which keeps the printing-unit guard (15) in its swung-up position, but in the swung-down state remains in the compressed state as a result of the changed angular relationships.
- Self-releasing holding device according to one or more of Claims 9 to 12, characterized in that the printing plate (2'), after being released by the last suction cup (1), is intercepted and guided by a press-down element (25).
- Self-releasing holding device according to Claim 13, characterized in that the press-down element (25) presses the angled rear edge (14) of the printing plate (2') into the appliance (13) in order to clamp the rear edge of the printing plate (2').
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4214047 | 1992-04-29 | ||
DE4214047A DE4214047A1 (en) | 1992-04-29 | 1992-04-29 | HOLDING DEVICE FOR A PLATE TO BE SLIDED |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0567753A1 EP0567753A1 (en) | 1993-11-03 |
EP0567753B1 true EP0567753B1 (en) | 1996-07-10 |
Family
ID=6457717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93104229A Expired - Lifetime EP0567753B1 (en) | 1992-04-29 | 1993-03-16 | Holding device for a movable plate |
Country Status (7)
Country | Link |
---|---|
US (1) | US5361699A (en) |
EP (1) | EP0567753B1 (en) |
JP (1) | JPH0623956A (en) |
CN (1) | CN1029672C (en) |
AU (1) | AU656666B2 (en) |
CA (1) | CA2091795A1 (en) |
DE (2) | DE4214047A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4214049A1 (en) * | 1992-04-29 | 1993-11-04 | Heidelberger Druckmasch Ag | DEVICE FOR FEEDING A PRINT PLATE TO A PLATE CYLINDER OF A PRINTING MACHINE |
DE4402158C1 (en) * | 1994-01-26 | 1995-02-02 | Heidelberger Druckmasch Ag | Safeguard on printing machines |
FR2718675B1 (en) * | 1994-04-18 | 1996-07-12 | Heidelberg Harris Sa | Device for exchanging pictures of rotary printing machines. |
DE4414443C1 (en) * | 1994-04-26 | 1995-11-30 | Heidelberger Druckmasch Ag | Device for guiding a print carrier |
DE9415751U1 (en) * | 1994-09-29 | 1994-11-17 | Man Roland Druckmaschinen Ag, 63069 Offenbach | Device for feeding a printing plate to the plate cylinder of a printing machine |
DE19507908C2 (en) * | 1995-03-07 | 1999-12-09 | Heidelberger Druckmasch Ag | Device for pulling and holding a printing plate, which was removed from a plate cylinder of a rotary printing press |
GB2304632B (en) * | 1995-08-29 | 1998-09-23 | Heidelberger Druckmasch Ag | Guard for a unit of a printing machine |
US6113346A (en) | 1996-07-31 | 2000-09-05 | Agfa Corporation | Method for loading and unloading a supply of plates in an automated plate handler |
DE19744457C1 (en) | 1997-10-08 | 1999-06-24 | Siemens Ag | Remote operator with motor for circuit breaker |
DE19834783A1 (en) * | 1998-08-01 | 2000-02-03 | Koenig & Bauer Ag | Process and device for ensuring occupational safety |
DE10010056B4 (en) * | 1999-03-31 | 2012-11-08 | Heidelberger Druckmaschinen Ag | Printing plate changer |
DE102004023434A1 (en) * | 2004-05-10 | 2005-12-08 | Maschinenfabrik Wifag | Rotary printing machine with suction device, suction device and method for changing a printing form |
DE102008010598A1 (en) * | 2008-02-22 | 2009-08-27 | Manroland Ag | Handling device of a printing machine |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1006042A (en) * | 1964-06-22 | 1965-09-29 | Harris Intertype Corp | Sheet gripping sucker |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
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US2404412A (en) * | 1943-10-07 | 1946-07-23 | Robert M Stephens | Vacuum cup |
US2659560A (en) * | 1951-09-13 | 1953-11-17 | George A Lehmann | Suction mounting for can openers or the like |
AU733266A (en) * | 1967-06-22 | 1968-01-18 | ALISTAIR KENDALL IRVINE and WILLIAM ALEXANDER IRVINE | Improvements relating to suction cups |
US3649069A (en) * | 1970-06-03 | 1972-03-14 | Andrew H Zip | Glare shield for automobiles |
AU7438081A (en) * | 1981-08-20 | 1983-02-24 | Hunter Douglas Ltd. | Suction device |
EP0095218B1 (en) * | 1982-05-26 | 1986-10-29 | Agfa-Gevaert N.V. | A sheet dispenser |
DE8215605U1 (en) * | 1982-05-28 | 1982-09-09 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | SECURING DEVICE ON ROTATION PRINTING MACHINES |
JPS5922755A (en) * | 1982-07-30 | 1984-02-06 | Komori Printing Mach Co Ltd | Apparatus for holding press plate of sheet-fed rotary press |
JPS6073850A (en) * | 1983-09-26 | 1985-04-26 | Tokyo Kikai Seisakusho:Kk | Automatic attaching and detaching device for printing plate of rotary press |
US4624456A (en) * | 1985-09-26 | 1986-11-25 | Crathern Engineering Co., Inc. | Apparatus for actuating a suction workholder |
JP2643178B2 (en) * | 1987-09-18 | 1997-08-20 | ソニー株式会社 | Video signal recording device |
JPH07115462B2 (en) * | 1988-01-06 | 1995-12-13 | 三菱重工業株式会社 | Hand for robot to attach / detach plate to / from plate cylinder |
US4883282A (en) * | 1988-03-07 | 1989-11-28 | Wolf Isobel T | Apparatus for supporting the handicapped or elderly |
EP0411731B1 (en) * | 1989-08-04 | 1995-11-29 | Komori Corporation | Plate-lockup apparatus for sheet-fed press |
JP2867155B2 (en) * | 1989-12-06 | 1999-03-08 | 株式会社 小森コーポレーション | Plate supply device to plate cylinder |
DE69022822T2 (en) * | 1989-12-06 | 1996-05-23 | Komori Printing Mach | Plate loading device for printing presses. |
DE3940449A1 (en) * | 1989-12-07 | 1991-06-13 | Roland Man Druckmasch | HANDLING DEVICE |
JP2844539B2 (en) * | 1989-12-15 | 1999-01-06 | 株式会社小森コーポレーション | Plate holding device for printing press |
JP2722022B2 (en) * | 1991-03-14 | 1998-03-04 | 株式会社小森コーポレーション | Plate mounting device on plate cylinder |
-
1992
- 1992-04-29 DE DE4214047A patent/DE4214047A1/en active Granted
-
1993
- 1993-03-16 DE DE59303174T patent/DE59303174D1/en not_active Expired - Fee Related
- 1993-03-16 EP EP93104229A patent/EP0567753B1/en not_active Expired - Lifetime
- 1993-03-17 CA CA002091795A patent/CA2091795A1/en not_active Abandoned
- 1993-03-29 CN CN93103309A patent/CN1029672C/en not_active Expired - Fee Related
- 1993-04-23 JP JP5097657A patent/JPH0623956A/en active Pending
- 1993-04-28 AU AU38214/93A patent/AU656666B2/en not_active Ceased
- 1993-04-29 US US08/054,963 patent/US5361699A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1006042A (en) * | 1964-06-22 | 1965-09-29 | Harris Intertype Corp | Sheet gripping sucker |
Also Published As
Publication number | Publication date |
---|---|
EP0567753A1 (en) | 1993-11-03 |
CN1029672C (en) | 1995-09-06 |
JPH0623956A (en) | 1994-02-01 |
DE59303174D1 (en) | 1996-08-14 |
US5361699A (en) | 1994-11-08 |
CA2091795A1 (en) | 1993-10-30 |
DE4214047C2 (en) | 1994-04-07 |
AU656666B2 (en) | 1995-02-09 |
DE4214047A1 (en) | 1993-11-04 |
AU3821493A (en) | 1993-11-11 |
CN1077920A (en) | 1993-11-03 |
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