EP0755887A2 - Method and device for pneumatically slowing down sheets in the delivery device of a rotary sheet printing machine - Google Patents
Method and device for pneumatically slowing down sheets in the delivery device of a rotary sheet printing machine Download PDFInfo
- Publication number
- EP0755887A2 EP0755887A2 EP96110376A EP96110376A EP0755887A2 EP 0755887 A2 EP0755887 A2 EP 0755887A2 EP 96110376 A EP96110376 A EP 96110376A EP 96110376 A EP96110376 A EP 96110376A EP 0755887 A2 EP0755887 A2 EP 0755887A2
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- EP
- European Patent Office
- Prior art keywords
- sheet
- braking
- air
- blowing
- nozzles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/68—Reducing the speed of articles as they advance
- B65H29/686—Pneumatic brakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/21—Industrial-size printers, e.g. rotary printing press
Definitions
- the invention relates to a method and to a device for pneumatic sheet braking in the delivery of a sheet-fed rotary printing machine by means of blown air, which is opposite to the sheet transport direction.
- This air flow which opposes the arc movement, creates a negative pressure on the rear edge of the blow bar in the direction of the sheet travel, through which the sheet is sucked in and thereby braked due to the resulting frictional forces.
- the entire width of the sheet comes into contact with the blow bar, or in individual zones, so that there are slight signs of smearing, especially in the perfecting.
- a guide plate bent downward in the shape of a horn with cut-out tongues adjoins the blow bar in the opposite direction to the sheet running. The blowing air directed from the blow nozzles of the blow bar under the bend flows over the curved surface and hugs the bend by negative pressure on the guide tongues.
- the invention has for its object to provide a solution for a non-contact braking of a sheet carried on the braking path by an air stream in the delivery of a sheet-fed rotary printing press for high-quality printed products, in order to avoid smearing, especially in perfecting, when braking the sheet.
- the effect of the method according to the invention is not based on friction of the sheet to be braked, but on shear stresses in the air flow carrying the sheet without contact.
- the braking force results from the product of the shear stress resulting at the interface in the air flow and the area acted upon by this air flow.
- the air flow is formed between a baffle and the bend. The pre-pressure of the air flow is converted into kinetic energy and the air flow spreads evenly to form a full-surface film flow under the arch.
- the method according to the invention can be used in a particular manner in the case of an essentially contact-free sheet transport of the sheet in the delivery on an air flow carrying the sheet, this air flow being directed in the transport direction of the sheet.
- both the air flow carrying the sheet and directed in the transport direction of the sheet and the air flow opposite to the sheet transport direction become for braking the sheet in front of the actual braking track for the sheet in a controlled downward direction.
- the downward-derived air flow can optionally be returned to the blowing nozzles of one or the other air flow via control devices.
- a device in which a blowing nozzle strip directed against the sheet transport direction has a rounded cross-sectional profile at least on its rear edge and blowing nozzles still in the region of these roundings.
- a channel is arranged for discharging the air flows directed against one another.
- the air volume and the air pressure can be adjustable to regulate the air flow for braking the sheet. Further control options are provided by adjustable blow nozzles with an adjustable throttle point and nozzle openings that are adjustable in the direction.
- the drawing shows schematic representations for explaining the method according to the invention and for designing a device for carrying out such a method.
- FIG. 1 shows a sheet delivery, in which sheet grippers 1 of a gripper system 3 arranged on revolving conveyor chains 2 grasp the sheet 4 at its front edge in the transport direction and lead from the last printing unit of a sheet-fed rotary printing press to delivery stack 5. Immediately before the delivery stack 5, the braking of the sheet arriving at high speed 4 begins. Blowing air directed against the transport direction of the sheet 4 is blown under the blow gripper by means of a blowing nozzle strip 6 which extends over the sheet width and has a rounded cross section and on its upper side 1 of the gripper systems 3 blown sheet blown.
- a blowing nozzle strip 6 which extends over the sheet width and has a rounded cross section and on its upper side 1 of the gripper systems 3 blown sheet blown.
- FIG. 2 shows a diagram of the formation of the speed distribution in the sheet transport direction that causes the shear stresses opposing air flow, the sheet is carried contact-free on a transport level with a distance above the guide level determined by mechanical installations.
- the shear stresses developing in the air flow counteract the kinetic energy of the bow, so that the bow is braked continuously. It is advisable not to slow the sheet down to a standstill, but only to a residual speed that still allows good sheet placement on the delivery stack.
- FIG. 3 shows that the braking air blown under the arch for the purpose of braking the arch 4 is diverted downward at the beginning of the braking section and can be blown again as braking air under the arch via a control element 7.
- FIGS. 3 and 4 show the formation of a braking section for the sheet following a contact-free sheet guide through blown air which is blown under the sheet 4 in the direction of sheet transport.
- the two encountered air streams one of which is directed towards the sheet in the transport direction of the sheet and one is directed against the sheet conveying direction for braking the sheet, are derived downward via a channel 8 and, if necessary, again via the control element 7 as brake air among the Blown sheet 4.
- the outflow direction of the blow nozzles in the blow bar 6 is shown schematically in FIG. 4 in two alternative embodiments.
- FIG. 5 An embodiment of the structural design of the blow nozzle bar 6 is shown in Figures 5 and 6.
- the cross section in FIG. 5 shows a blower nozzle strip 6 formed from sheet metal with a connecting piece 10 for the Blowing air.
- both the front edge and the rear edge of the blow nozzle bar 6 are rounded.
- the blowing air exits against the conveying direction of the sheet 4 through blowing nozzles 9, which are formed by tongue-shaped incisions 11 on the top of the blowing nozzle strip 6.
- Such incisions 11 are also located in the area of the rounding of the blow nozzle strip 6, in order in this way to avoid the formation of a vacuum under the arch 4.
- the rear edge of the sheet 4 lowers onto the main stack 5 in the delivery.
- FIG. 7 Blowing air is blown from the blowing nozzles 9 of the blowing nozzle strip 6 in the area of the braking section against the transport direction of the sheet, under the sheet 4 initially held by the gripper system 3 on its front edge, as a result of which the sheet 4 is tightened and stretched. Shear stresses form under the arch 4, as shown in FIG. 2, by means of which the arch 4 is braked after its release by the gripper system.
- the sheet 4 is transported in a contact-free manner on the air flow for braking the sheet 4.
- the sheet transport takes place before the braking section on an air flow which is directed in the conveying direction of the sheet.
- This air flow carrying the sheet 4 and the air flow directed against it for pneumatic sheet braking are derived downward immediately before the braking section for the sheet 4.
- the possible return of the derived air flow was explained in relation to FIG. 3.
- FIG. 8 illustrates the shingled sheet transport to the delivery stack 5. While the rear end of a sheet 4 already released by the gripper system 3 shows the shear stresses caused by surface friction Brake air is exposed, a subsequent sheet 4 is still held by the gripper system 3 and carried by the air flow directed in the conveying direction. Only when the rear end of the former sheet 4 has cleared the channel 8 for discharging the air for sheet conveying and the brake air for braking the sheet, do shear stresses also form under the second sheet for braking the sheet. In this way, a completely non-contacting shingling takes place with the aid of the levitation guide upstream of the braking section, which also saves time for braking the arch.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
- Discharge By Other Means (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren und auf eine Vorrichtung zum pneumatischen Bogenabbremsen im Ausleger einer Bogenrotationsdruckmaschine mittels Blasluft, die der Bogentransportrichtung entgegengerichtet ist.The invention relates to a method and to a device for pneumatic sheet braking in the delivery of a sheet-fed rotary printing machine by means of blown air, which is opposite to the sheet transport direction.
Der dem erfindungsgemäßen Verfahren und der zu seiner Ausübung benutzten Vorrichtung nächstliegende Stand der Technik ergibt sich aus der DE-AS 21 35 105. Hieraus ist es bekannt, den ankommenden, an seiner in Transportrichtung vorderen Kante durch Bogengreifer eines an Förderketten umlaufenden Greifersystems gehaltenen Bogen auf ganzer Breite mit Blasluft zu unterblasen, die dem Bogenlauf entgegengerichtet ist, wobei diese Blasluft aus Blasdüsen einer Blasdüsenleiste austritt, die in der Förderstrecke des Bogens unmittelbar vor der vorderen Kante eines Auslegestapels unterhalb der Bewegungsbahn des Bogens angeordnet ist. Durch diese der Bogenbewegung entgegengerichtete Luftströmung entsteht an der in Bogenlaufrichtung hinteren Kante der Blasleiste ein Unterdruck, durch den der Bogen angesaugt und dadurch infolge der entstehenden Reibungskräfte kraftschlüssig abgebremst wird. Der Bogen kommt dabei auf ganzer Breite mit der Blasleiste vollständig, oder in einzelnen Zonen, reibend in Berührung, so daß vor allem im Schön- und Widerdruck leicht Abschmiererscheinungen entstehen. An die Blasleiste schließt sich entgegen der Bogenlaufrichtung ein hornförmig abwärts gebogenes Leitblech mit freigeschnittenen Zungen an. Die aus den Blasdüsen der Blasleiste unter den Bogen gerichtete Blasluft strömt über die gekrümmte Fläche und schmiegt den Bogen durch Unterdruck an die Leitzungen.The closest prior art to the method according to the invention and the device used for its exercise results from DE-AS 21 35 105. It is known from this that the sheet arriving at its front edge in the transport direction by sheet grippers is held by a sheet held on conveyor chains by a gripper system to blow the full width with blowing air, which is directed against the sheet run, this blowing air exiting from blowing nozzles of a blowing nozzle strip which is arranged in the conveying path of the sheet immediately in front of the front edge of a delivery stack below the path of movement of the sheet. This air flow, which opposes the arc movement, creates a negative pressure on the rear edge of the blow bar in the direction of the sheet travel, through which the sheet is sucked in and thereby braked due to the resulting frictional forces. The entire width of the sheet comes into contact with the blow bar, or in individual zones, so that there are slight signs of smearing, especially in the perfecting. A guide plate bent downward in the shape of a horn with cut-out tongues adjoins the blow bar in the opposite direction to the sheet running. The blowing air directed from the blow nozzles of the blow bar under the bend flows over the curved surface and hugs the bend by negative pressure on the guide tongues.
Wirkungsgleiche, aber konstruktiv abweichende Anordnungen sind aus der DE-PS 23 58 206 und aus der DE-OS 27 20 674 bekannt.Arrangements with the same effect, but with different designs, are known from DE-PS 23 58 206 and from DE-OS 27 20 674.
Der Erfindung liegt die Aufgabe zugrunde, eine Lösung für ein berührungsfreies Abbremsen eines auf dem Bremsweg von einem Luftstrom getragenen Bogens im Ausleger einer Bogenrotationsdruckmaschine für Druckerzeugnisse hoher Qualität darzustellen, um Abschmiererscheinungen, vor allem im Schön- und Widerdruck, beim Abbremsen des Bogens zu vermeiden.The invention has for its object to provide a solution for a non-contact braking of a sheet carried on the braking path by an air stream in the delivery of a sheet-fed rotary printing press for high-quality printed products, in order to avoid smearing, especially in perfecting, when braking the sheet.
Zur Lösung dieser Aufgabe wird erfindungsgemäß ein Verfahren nach dem Patentanspruch 1 vorgeschlagen.To achieve this object, a method according to claim 1 is proposed according to the invention.
In Abweichung von Lösungsversuchen nach dem Stande der Technik beruht die Wirkung des erfindungsgemäßen Verfahrens nicht auf Reibung des abzubremsenden Bogens, sondern auf Schubspannungen in des den Bogen berührungsfrei tragenden Luftstrom. Die Bremskraft ergibt sich aus dem Produkt der sich an der Grenzfläche im Luftstrom ergebenden Schubspannung und der mit diesem Luftstrom beaufschlagten Fläche. Zur Erzielung dieser Wirkung wird die Luftströmung zwischen einem Leitblech und dem Bogen ausgebildet. Dabei erfolgt eine Umsetzung des Vordruckes der Luftströmung in kinetische Energie und eine gleichmäßige Ausbreitung des Luftstroms zu einer flächendeckenden Filmströmung unter dem Bogen.In a departure from attempts at solution according to the prior art, the effect of the method according to the invention is not based on friction of the sheet to be braked, but on shear stresses in the air flow carrying the sheet without contact. The braking force results from the product of the shear stress resulting at the interface in the air flow and the area acted upon by this air flow. To achieve this effect, the air flow is formed between a baffle and the bend. The pre-pressure of the air flow is converted into kinetic energy and the air flow spreads evenly to form a full-surface film flow under the arch.
In besonderer Weise anwendbar ist das erfindungsgemäße Verfahren bei einem in wesentlichen berührungsfreien Bogentransport des Bogens im Ausleger auf einem den Bogen tragenden Luftstrom, wobei dieser Luftstrom in Transportrichtung des Bogens gerichtet ist. In einem solchen Falle werden sowohl der den Bogen tragenden, in Transportrichtung des Bogens gerichtete Luftstrom, als auch der der Bogentransportrichtung entgegengerichtete Luftstrom zum Abbremsen des Bogens vor der eigentlichen Bremss trecke für den Bogen kontrolliert nach unten abgeleitet. Der nach unten abgeleitete Luftstrom kann gegebenenfalls über Regeleinrichtungen zu den Blasdüsen des einen oder des anderen Luftstromes zurückgeführt werden.The method according to the invention can be used in a particular manner in the case of an essentially contact-free sheet transport of the sheet in the delivery on an air flow carrying the sheet, this air flow being directed in the transport direction of the sheet. In such a case, both the air flow carrying the sheet and directed in the transport direction of the sheet and the air flow opposite to the sheet transport direction become for braking the sheet in front of the actual braking track for the sheet in a controlled downward direction. The downward-derived air flow can optionally be returned to the blowing nozzles of one or the other air flow via control devices.
Zur Ausübung des erfindungsgemäßen Verfahrens ist eine Vorrichtung vorgesehen, bei der eine gegen die Bogentransportrichtung gerichtete Blasdüsen aufweisende Blasdüsenleiste wenigstens an ihrer Hinterkante ein abgerundetes Querschnittsprofil und Blasdüsen noch im Bereich dieser Abrundungen aufweist. Es wird durch diese Ausbildungsmerkmale ein Unterdruck unter dem Bogen und damit ein Ansaugen des Bogens vermieden.To carry out the method according to the invention, a device is provided in which a blowing nozzle strip directed against the sheet transport direction has a rounded cross-sectional profile at least on its rear edge and blowing nozzles still in the region of these roundings. These training features prevent negative pressure under the arch and thus suction of the arch.
Zwischen der den Bogen schwebend bis zur Bremsstrecke transportierenden Blaseinrichtung und einer Blaseinrichtung für die Abbremsung des Bogens durch entgegengesetzt gerichtete Blasluft ist ein Kanal zur Ableitung der gegeneinander gerichteten Luftströme angeordnet.Between the blowing device, which transports the sheet up to the braking section, and a blowing device for braking the sheet by oppositely directed blowing air, a channel is arranged for discharging the air flows directed against one another.
Zur Regelung des Luftstromes für die Bogenabbremsung können die Luftmenge und der Luftdruck einstellbar sein. Weitere Regelungsmöglichkeiten ergeben sich durch einstellbare Blasdüsen mit regulierbarer Drosselstelle und in der Richtung verstellbaren Düsenöffnungen.The air volume and the air pressure can be adjustable to regulate the air flow for braking the sheet. Further control options are provided by adjustable blow nozzles with an adjustable throttle point and nozzle openings that are adjustable in the direction.
Die Zeichnung zeigt schematische Darstellungen zur Erläuterung des erfindungsgemäßen Verfahrens und zur Gestaltung einer Vorrichtung für die Ausübung eines solchen Verfahrens.The drawing shows schematic representations for explaining the method according to the invention and for designing a device for carrying out such a method.
Es zeigen:
- Fig. 1
- eine Seitenansicht einer Bogenauslage mit Auslagestapel,
- Fig. 2,3 + 4
- Schemata für die Luftführung im Bereich der Bremsstrecke für den abzubremsenden Bogen,
- Fig. 5
- einen vertikalen Querschnitt durch die Blasdüsenleiste,
- Fig. 6
- eine Draufsicht auf einen Teilbereich der Blasdüsenleiste,
- Fig. 7
- eine Darstellung des Wirkungsprinzips des erfindungsgemäßen Verfahrens und
- Fig. 8
- eine Darstellung des geschuppten Bogentransports zum Auslegestapel mit pneumatischer Bogenbremsung.
- Fig. 1
- a side view of a sheet delivery with delivery stack,
- Fig. 2,3 + 4
- Schemes for the air flow in the area of the braking section for the sheet to be braked,
- Fig. 5
- a vertical cross section through the blow nozzle bar,
- Fig. 6
- a plan view of a portion of the blow nozzle bar,
- Fig. 7
- a representation of the principle of action of the method according to the invention and
- Fig. 8
- a representation of the shingled sheet transport to the delivery stack with pneumatic sheet braking.
Die Figur 1 zeigt einen Bogenausleger, bei dem Bogengreifer 1 eines an umlaufend geführten Förderketten 2 angeordneten Greifersystems 3 den Bogen 4 jeweils an seiner in Transportrichtung vorderen Kante erfassen und vom letzten Druckwerk einer Bogenrotationsdruckmaschine zum Auslegestapel 5 führen. Unmittelbar vor dem Auslegestapel 5 beginnt die Abbremsung des mit hoher Geschwindigkeit ankommenden Bogens 4. Über eine sich über die Bogenbreite erstreckende Blasdüsenleiste 6 mit im Querschnitt gerundeter Oberseite und an ihrer Oberseite angeordneten Blasdüsen wird entgegen der Transportrichtung des Bogens 4 gerichtete Blasluft unter den durch die Bogengreifer 1 der Greifersysteme 3 freigegebenen Bogen geblasen. Die Menge und der Druck dieser Blasluft werden auf einen Gleichgewichtszustand mit der vom ankommenden Bogen ausgehenden kinetischen Energie eingestellt, so daß der Bogen 4 im Bereich des Bremsweges berührungsfrei von diesem Luftstrom getragen wird. Die Figur 2 zeigt in einem Schaubild die Ausbildung der die Schubspannungen hervorrufenden Geschwindigkeitsverteilung in dem der Bogentransportrichtung entgegengerichteten Luftstrom, wobei der Bogen berührungsfrei auf einem Transportniveau mit einem Absta nd oberhalb des durch mechanische Einbauten bestimmten Führungsniveaus berührungsfrei getragen wird. Die sich in dem Luftstrom ausbildenden Schubspannungen wirken der kinetischen Energie des Bogens entgegen, so daß der Bogen kontinuierlich abgebremst wird. Es ist sinnvoll, den Bogen nicht bis zum Stillstand abzubremsen, sondern lediglich bis zu einer Restgeschwindigkeit, die noch eine gute Bogenablage auf dem Auslegestapel ermöglicht.FIG. 1 shows a sheet delivery, in which sheet grippers 1 of a
In dem Schaubild der Figur 3 ist dargestellt, daß die zum Zwecke des Abbremsen des Bogens 4 unter den Bogen geblasene Bremsluft am Beginn der Bremsstrecke nach unten abgeleitet und über ein Regelorgan 7 gegebenenfalls erneut als Bremsluft unter den Bogen geblasen werden kann.The diagram in FIG. 3 shows that the braking air blown under the arch for the purpose of braking the
Die Schaubilder in den Figuren 3 und 4 zeigen die Ausbildung einer Bremsstrecke für den Bogen im Anschluß an eine berührungsfreie Bogenführung durch Blasluft, die in Richtung des Bogentransports unter den Bogen 4 geblasen wird. Bei einer solchen Anordnung werden die beiden aufeinandertreffenden Luftströme, von denen einer zur Bogenförderung in Transportrichtung des Bogens gerichtet und einer zum Abbremsen des Bogens entgegen der Bogenförderrichtung gerichtetet ist, über einen Kanal 8 nach unten abgeleitet und gegebenenfalls über das Regelorgan 7 erneut als Bremsluft unter den Bogen 4 geblasen. Schematisch ist in der Figur 4 die Ausströmrichtung der Blasdüsen in der Blasleiste 6 in zwei alternativen Ausführungsformen dargestellt.The diagrams in FIGS. 3 and 4 show the formation of a braking section for the sheet following a contact-free sheet guide through blown air which is blown under the
Ein Ausführungsbeispiel für die konstruktive Gestaltung der Blasdüsenleiste 6 ist in den Figuren 5 und 6 dargestellt. Der Querschnitt in Figur 5 zeigt eine aus Blech geformte Blasdüsenleiste 6 mit einem Anschlußstutzen 10 für die Blasluft. In Transportrichtung des Bogens 4 ist sowohl die Vorderkante als auch die Hinterkante der Blasdüsenleiste 6 abgerundet. Die Blasluft tritt entgegen der Förderrichtung des Bogens 4 durch Blasdüsen 9 aus, die durch zungenförmige Einschnitte 11 an der Oberseite der Blasdüsenleiste 6 gebildet sind. Solche Einschnitte 11 befinden sich auch im Bereich der Abrundungen der Blasdüsenleiste 6, um auf diese Weise die Ausbildung eines Unterdrucks unter dem Bogen 4 zu vermeiden. An einer Bogenführung 12 senkt sich die Hinterkante des Bogens 4 auf den Hauptstapel 5 im Ausleger.An embodiment of the structural design of the
Das Wirkungsprinzip des erfindungsgemäßen Verfahrens zur Bogenbremsung durch Blasluft wird in der Figur 7 veranschaulicht. Unter den zunächst noch durch das Greifersystem 3 an seiner Vorderkante gehaltenen Bogen 4 wird im Bereich der Bremsstrecke entgegen der Transportrichtung des Bogens Blasluft aus den Blasdüsen 9 der Blasdüsenleiste 6 geblasen, wodurch eine Straffung und Streckung des Bogens 4 erfolgt. Dabei bilden sich unter dem Bogen 4 Schubspannungen entsprechend der Darstellung in der Figur 2 aus, durch die eine Abbremsung des Bogens 4 nach seiner Freigabe durch das Greifersystem erfolgt. Der Transport des Bogens 4 erfolgt dabei berührungsfrei auf dem Luftstrom zur Abbremsung des Bogens 4. Bei der Anordnung nach dem Schaubild in Figur 7 erfolgt der Bogentransport bereits vor der Bremsstrecke auf einem Luftstrom, welcher in Förderrichtung des Bogens gerichtet ist. Dieser den Bogen 4 tragende Luftstrom und der ihm entgegengerichtete Luftstrom zur pneumatischen Bogenbremsung werden unmittelbar vor der Bremsstrecke für den Bogen 4 nach unten abgeleitet. Die mögliche Rückführung des abgeleiteten Luftstromes wurde zu Figur 3 erläutert.The principle of operation of the method according to the invention for sheet braking by blown air is illustrated in FIG. 7. Blowing air is blown from the blowing nozzles 9 of the blowing
Das Schaubild in der Figur 8 veranschaulicht den geschuppten Bogentransport zum Auslegestapel 5. Während noch das hintere Ende eines bereits vom Greifersystem 3 freigegebenen Bogens 4 den durch Oberflächenreibung bewirkten Schubspannungen der Bremsluft ausgesetzt ist, wird ein nachfolgender Bogen 4 noch vom Greifersystem 3 gehalten und von dem in Förderrichtung gerichteten Luftstrom getragen. Erst wenn das hintere Ende des ersteren Bogens 4 den Kanal 8 zur Ableitung der Luft zur Bogenförderung und der Bremsluft zur Abbremsung des Bogens freigegeben hat, bilden sich auch unter dem zweiten Bogen Schubspannungen zur Abbremsung des Bogens aus. Auf diese Weise erfolgt eine vollkommen berührungsfreie Bogenschuppung mit Hilfe der der Bremsstrecke vorgelagerten Schwebeführung, durch die auch ein Zeitgewinn für die Abbremsung des Bogens erreicht wird.The diagram in FIG. 8 illustrates the shingled sheet transport to the
- 11
- BogengreiferBow grab
- 22nd
- FörderkettenConveyor chains
- 33rd
- GreifersystemGripper system
- 44th
- Bogenbow
- 55
- AuslegestapelDelivery pile
- 66
- BlasdüsenleisteBlow nozzle bar
- 77
- RegelorganGoverning body
- 88th
- Kanalchannel
- 99
- BlasdüseBlow nozzle
- 1010th
- AnschlußConnection
- 1111
- EinschnitteIncisions
- 1212th
- BogenführungBow guide
Claims (8)
dadurch gekennzeichnet,
daß der den Bogen abbremsende Luftstrom auf einen Gleichgewichtszustand seiner auf den Bogen einwirkenden Energie mit der kinetischen Energie des Bogens eingestellt und der Bogen im Bereich des Bremsweges berührungsfrei vom Luftstrom getragen wird.Method for braking a sheet in the delivery of a sheet-fed rotary printing machine by means of blown air, which is opposite to the sheet transport direction,
characterized by
that the air stream braking the bow is set to a state of equilibrium of its energy acting on the bow with the kinetic energy of the bow and the bow is carried contact-free by the air stream in the region of the braking distance.
dadurch gekennzeichnet,
daß der den Bogen auf seinem Bremsweg berührungsfrei tragende Luftstrom und ein ihm entgegengerichteter, den Bogen berührungsfrei zu einem Auslegestapel transportierender Luftstrom vor der Bremsstrecke des Bogens kontrolliert nach unten abgeleitet werden.Method according to claim 1,
characterized by
that the air flow carrying the sheet in contactless manner on its braking path and an air flow directed opposite it and transporting the sheet contact-free to a delivery stack are discharged in a controlled manner in front of the sheet's braking distance.
dadurch gekennzeichnet,
daß der nach unten abgeleitete Luftstrom über ein Regelorgan (7) zu den Bremsdüsen zurückgeführt wird.Process according to claims 1 and 2,
characterized by
that the downward air flow is returned to the brake nozzles via a control element (7).
dadurch gekennzeichnet,
daß eine gegen die Bogentransportrichtung gerichtete, Blasdüsen (9) aufweisende Blasdüsenleiste (6) wenigstens an ihrer in Laufrichtung des Bogens hinteren Kante ein abgerundetes Querschnittsprofil und an ihrer Oberseite Blasdüsen (9) im Bereich der Abrundungen aufweist.Device for carrying out a method according to claim 1,
characterized by
that a blowing nozzle strip (6) directed against the sheet transport direction and having blowing nozzles (9) has a rounded cross-sectional profile at least on its rear edge in the running direction of the sheet and blowing nozzles (9) in the region of the roundings on its upper side.
dadurch gekennzeichnet,
daß zwischen einer den Bogen schwebend transportierenden Blaseinrichtung für den berührungsfreien Transport zum Auslegestapel und einer Blaseinrichtung für die Bogenabbremsung ein Kanal (8) zur Ableitung der unter dem Bogen gegeneinander gerichteten Luftströme angeordnet ist.Device for carrying out a method according to claim 1,
characterized by
that a channel (8) for discharging the air currents directed against each other under the sheet is arranged between a blowing device which transports the sheet for contactless transport to the delivery stack and a blowing device for braking the sheet.
dadurch gekennzeichnet,
daß die Austrittsrichtung der Blasdüsen (9) in der Blasdüsenleiste (6) einstellbar ist.Device according to claim 5,
characterized by
that the outlet direction of the blowing nozzles (9) in the blowing nozzle bar (6) is adjustable.
dadurch gekennzeichnet,
daß zwischen den Blasdüsen (9) der Blasdüsenleiste (6), die gegen den Bogenlauf gerichtet sind, sich Blasdüsen befinden, aus denen Blasluft in Richtung des Bogenlaufs austritt.Apparatus according to claim 6,
characterized by
that between the blow nozzles (9) of the blow nozzle strip (6), which are directed against the sheet run, there are blow nozzles from which blow air emerges in the direction of the sheet run.
dadurch gekennzeichnet,
daß durch die berührungsfreie Bogenführung in der Bremsstrecke mit Hilfe der der Bremsstrecke vorgelagerten Schwebeführung eine berührungsfreie Bogenschuppung und dadurch ein Zeitgewinn für die Bogenabbremsung erfolgt.Device according to one or more of the preceding claims,
characterized by
that the non-contacting sheet guidance in the braking section with the aid of the floating guide upstream of the braking section results in non-contacting sheet scaling and thereby time saving for sheet braking.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19527441A DE19527441C2 (en) | 1995-07-27 | 1995-07-27 | Method and device for pneumatic sheet braking in the delivery of a sheet-fed rotary printing machine |
| DE19527441 | 1995-07-27 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0755887A2 true EP0755887A2 (en) | 1997-01-29 |
| EP0755887A3 EP0755887A3 (en) | 1997-10-15 |
| EP0755887B1 EP0755887B1 (en) | 2002-01-30 |
Family
ID=7767923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96110376A Expired - Lifetime EP0755887B1 (en) | 1995-07-27 | 1996-06-27 | Method and device for pneumatically slowing down sheets in the delivery device of a rotary sheet printing machine |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5718176A (en) |
| EP (1) | EP0755887B1 (en) |
| JP (1) | JP3676503B2 (en) |
| CN (1) | CN1144187A (en) |
| AT (1) | ATE212601T1 (en) |
| CA (1) | CA2180061A1 (en) |
| DE (2) | DE19527441C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3533738A3 (en) * | 2018-02-28 | 2019-09-11 | Müller Martini Holding AG | Brake for printed sheets |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10129886A (en) * | 1996-10-15 | 1998-05-19 | Heidelberger Druckmas Ag | Sheet paper inserting plate in automatic paper feeder of sheet paper processing machine |
| DE19914177A1 (en) * | 1999-03-29 | 2000-10-05 | Heidelberger Druckmasch Ag | Boom of a sheet-fed printing machine |
| DE10049809B4 (en) * | 1999-10-28 | 2014-02-13 | Heidelberger Druckmaschinen Ag | Guide device for a sheet-like substrate |
| DE10043807B4 (en) * | 1999-12-17 | 2009-05-07 | Heidelberger Druckmaschinen Ag | Boom of a flat printing material processing machine |
| DE10133633A1 (en) * | 2000-08-31 | 2002-03-14 | Heidelberger Druckmasch Ag | System for reducing friction between support and sheets of paper in processing machine comprise compressed air outlets in surface of support, outlets being fitted with throttle system, e.g. spiral air feed |
| US7513499B2 (en) | 2004-05-04 | 2009-04-07 | Heidelberger Druckmaschinen Ag | Sheet brake using a partitioned blower nozzle array |
| US8454665B2 (en) * | 2005-09-16 | 2013-06-04 | Christopher G. Sidebotham | Multi-purpose bone plate system |
| DE102008010985A1 (en) * | 2008-02-25 | 2009-08-27 | Heidelberger Druckmaschinen Ag | Sheet braking mechanism |
| US7913999B2 (en) * | 2008-06-12 | 2011-03-29 | Xerox Corporation | Resilient belt sheet compiler with mixed sheet length mode |
| BR102015024454A2 (en) * | 2014-10-01 | 2016-05-24 | Müller Martini Holding AG | transverse puller brake for printing sheet |
| BR102015024953A2 (en) * | 2014-10-01 | 2016-04-12 | Müller Martini Holding AG | print sheet brake |
| US11214453B2 (en) * | 2018-07-23 | 2022-01-04 | Hewlett-Packard Development Company, L.P. | Media transfer |
| CN111605764B (en) * | 2020-06-04 | 2021-10-29 | 青岛欣欣向荣智能设备有限公司 | Airflow threading packer and packing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2135105B1 (en) * | 1971-07-14 | 1972-11-09 | Roland Offsetmaschf | Sheet delivery device on rotary printing machines |
| DE2358206A1 (en) * | 1973-11-22 | 1975-05-28 | Roland Offsetmaschf | DEVICE ON PRINTING MACHINES FOR TRANSPORTING SHEETS |
| DE2720674A1 (en) * | 1977-05-07 | 1978-11-09 | Maschf Augsburg Nuernberg Ag | Sheet feed for rotary printing press - has gripper system and stop with blower at laying-up point |
| WO1989009177A1 (en) * | 1988-04-02 | 1989-10-05 | Hilmar Vits | Process and device for the suspended conveyance of material in sheets or in webs over a conveying route, in particular a curved conveying route |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3081082A (en) * | 1958-12-15 | 1963-03-12 | Linotype Machinery Ltd | Sheet control for printing machines |
| US3437335A (en) * | 1967-06-16 | 1969-04-08 | Sperry Rand Corp | Fluid document transporter |
| US3503607A (en) * | 1967-12-27 | 1970-03-31 | Sperry Rand Corp | Pneumatic document stacking device |
| JPS5269186A (en) * | 1975-12-08 | 1977-06-08 | Hitachi Ltd | Air conveyor |
| DE3113750A1 (en) * | 1981-04-04 | 1982-10-14 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | "BOW BOOM FOR ROTARY PRINTING MACHINES WITH GRIPPER BRIDGES CIRCULATING ON ENDLESS CHAINS" |
| DD251964A1 (en) * | 1986-08-04 | 1987-12-02 | Polygraph Leipzig | ARC DIRECTION IN PRESSURE MACHINES |
| DE3779917T2 (en) * | 1986-12-22 | 1992-12-10 | Shimizu Construction Co Ltd | METHOD AND DEVICE FOR COLLECTING MUELL. |
-
1995
- 1995-07-27 DE DE19527441A patent/DE19527441C2/en not_active Expired - Fee Related
-
1996
- 1996-06-27 DE DE59608664T patent/DE59608664D1/en not_active Expired - Fee Related
- 1996-06-27 EP EP96110376A patent/EP0755887B1/en not_active Expired - Lifetime
- 1996-06-27 CA CA002180061A patent/CA2180061A1/en not_active Abandoned
- 1996-06-27 AT AT96110376T patent/ATE212601T1/en not_active IP Right Cessation
- 1996-07-19 CN CN96107174A patent/CN1144187A/en active Pending
- 1996-07-19 JP JP19077596A patent/JP3676503B2/en not_active Expired - Fee Related
- 1996-07-29 US US08/681,940 patent/US5718176A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2135105B1 (en) * | 1971-07-14 | 1972-11-09 | Roland Offsetmaschf | Sheet delivery device on rotary printing machines |
| DE2358206A1 (en) * | 1973-11-22 | 1975-05-28 | Roland Offsetmaschf | DEVICE ON PRINTING MACHINES FOR TRANSPORTING SHEETS |
| DE2720674A1 (en) * | 1977-05-07 | 1978-11-09 | Maschf Augsburg Nuernberg Ag | Sheet feed for rotary printing press - has gripper system and stop with blower at laying-up point |
| WO1989009177A1 (en) * | 1988-04-02 | 1989-10-05 | Hilmar Vits | Process and device for the suspended conveyance of material in sheets or in webs over a conveying route, in particular a curved conveying route |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3533738A3 (en) * | 2018-02-28 | 2019-09-11 | Müller Martini Holding AG | Brake for printed sheets |
| US10934119B2 (en) | 2018-02-28 | 2021-03-02 | Mueller Martini Holding Ag | Printing sheet brake |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19527441C2 (en) | 1998-01-29 |
| ATE212601T1 (en) | 2002-02-15 |
| US5718176A (en) | 1998-02-17 |
| EP0755887A3 (en) | 1997-10-15 |
| CA2180061A1 (en) | 1997-01-28 |
| DE59608664D1 (en) | 2002-03-14 |
| JPH0940260A (en) | 1997-02-10 |
| JP3676503B2 (en) | 2005-07-27 |
| DE19527441A1 (en) | 1997-02-06 |
| EP0755887B1 (en) | 2002-01-30 |
| CN1144187A (en) | 1997-03-05 |
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