EP1424196B1 - Gripper body for conveying sheets in a sheet printing press - Google Patents

Gripper body for conveying sheets in a sheet printing press Download PDF

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Publication number
EP1424196B1
EP1424196B1 EP20030025172 EP03025172A EP1424196B1 EP 1424196 B1 EP1424196 B1 EP 1424196B1 EP 20030025172 EP20030025172 EP 20030025172 EP 03025172 A EP03025172 A EP 03025172A EP 1424196 B1 EP1424196 B1 EP 1424196B1
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EP
European Patent Office
Prior art keywords
gripper
system body
sheet conveying
gripper system
hollow profile
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 - Fee Related
Application number
EP20030025172
Other languages
German (de)
French (fr)
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EP1424196A1 (en
Inventor
Hans Zimmermann
Volker Taschenberger
Ralf Reichenberger
Uwe Reissenweber
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Koenig and Bauer AG
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Koenig and Bauer AG
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Publication of EP1424196A1 publication Critical patent/EP1424196A1/en
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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
    • B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
    • B65H29/04—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by endless chains or bands
    • B65H29/045—Details of grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/08—Combinations of endless conveyors and grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/30—Chains
    • B65H2404/34—Gripper bars bridging at least two chains running synchronously and parallely
    • B65H2404/343—Details of the bar bridging the chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/12—Means using fluid made only for exhausting gaseous medium producing gas blast
    • 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 present invention relates to a gripper system body for conveying sheets in sheet-fed presses according to the preamble of claim 1.
  • Such gripper system bodies are known as part of circulating chain conveyor systems.
  • the chain conveyor systems are used in cantilevers of sheet-fed printing machines in which printed sheets are removed from the last printing or coating unit in the sheet conveying direction and transported to a stack carrier, where their storage takes place in the form of a delivery stack. They can also be used to transport printed sheets between the printing or coating units of sheet-fed presses.
  • the gripper system body must have a high flexural rigidity in order to avoid tearing of the conveyed sheet in the acquisition of the upstream transport system.
  • a large mechanical strength of the gripper system body is required, which are exposed in the field of mostly small radii of curvature of their guideway over and immediately after the stacking area heavy loads.
  • the required bending stiffness of the gripper system body increases with the sheet width and speed.
  • the gripper system body in order to avoid vibrations, have a low weight and may not cover the sheets, which must remain accessible when using dryers for the dryer radiation.
  • gripper jaw gripper system body which has a box-shaped hollow profile.
  • the hollow profile encloses a cavity which receives a gripper shaft, on which a plurality of grippers are arranged with gripper fingers. These protrude through provided in the hollow profile openings and act to fix sheets with gripper pads together.
  • the hollow profile has an increased wall thickness in the region of the gripper pads and in the opposite area. The disadvantage of this solution is that the bending stiffness and strength of the hollow profile is reduced by the arrangement of the openings. The reinforcement of the walls leads to an overall high flexural strength and strength, but is associated with an adverse weight gain.
  • a gripper system body for a revolving conveyor system of a printing machine As a break-free hollow profile with a U-shaped outer and inner wall, which enclose a cavity and leak in the region of the gripper pads in a wall.
  • the main body is connected at the end to the conveyor system and has bearing blocks for receiving the gripper shaft. Both the bearing blocks and the gripper shaft mounted in these are arranged outside the cavity.
  • Such a designed gripper system body has a high bending stiffness at a comparatively low total weight. However, this is associated with a relatively large size.
  • the gripper system body consists of a traverse, grippers and gripper pads and carries in the sheet travel direction forward over the width of the sheet conveying path reaching louver, which is arranged controllably on the gripper carriage.
  • the disadvantage is that such a gripper system body has a relatively large total weight and must be made stable so that it can carry the additional weight of the Vietnameseleitschildes without the material of the Heilleitschildes contributes to increase the flexural rigidity of the gripper system body.
  • a gripper system body according to the preamble of claim 1 is known from DE-A-33 08 844 known.
  • the gripper system body according to the invention has the advantage that it combines high bending stiffness and high strength with advantageous fluidic properties.
  • the arrangement of a traverse at a distance from the hollow profile material is concentrated at one point, where it contributes to the greatest extent to increase bending stiffness and strength.
  • the arrangement of the gripper shaft and the gripper inside the hollow profile are protected against contamination, for example by powder.
  • an air flow can be generated by moving the gripper system body in the sheet conveying direction.
  • the air flow is directed towards the sheet conveying path and introduces air into the swirling negative pressure area resulting from the movement of the gripper system body in the sheet conveying direction.
  • the resulting behind the gripper system body vacuum is dependent on the speed of movement. As the speed of movement increases, so does the flow in the flow channel, which adds a larger volume of air to the negative pressure area.
  • the advantageous effect of the gripper system body according to the invention is thus independent of the speed.
  • the flow channel is designed such that the air flow is oriented at an angle between 35 and 45 degrees inclined to the sheet conveying path.
  • a connection between the hollow body and the traverse can take place in the direction of the Bogen inconvenienceweges extending, transversely to the sheet conveying path spaced from each other arranged ribs or webs. These have transversely to the sheet conveying path to an extent which is many times smaller than the distance between the ribs to each other. As a result, over the entire width of the Bogen administratweges approximately the same flow cross-section is formed and the rigidity of the entire system is increased.
  • the hollow profile on the side facing away from the Bogen allergyweg a cross section with a convex curvature. This reduces the flow resistance of the gripper system body.
  • the convex curvature is considered counter to the sheet conveying direction, preferably flattened.
  • the hollow profile may have a drop-shaped cross-section according to another aerodynamically optimized design.
  • the traverse is preferably designed so that it has a low air resistance, which is achieved by a wedge-shaped or drop-shaped cross section.
  • the flow channel is preferably formed with a constant in the direction of the air flow cross-section.
  • the choice of the cross section depends on the shape of the hollow body and thus the parameters of the negative pressure zone, so that also widening or tapering cross sections can be provided.
  • a strong flow can be realized by the traverse is formed with an acute-angled leading edge viewed in the sheet conveying direction, which runs in the greater vertical distance to the sheet conveying path, as the hollow profile extends in the vertical direction of the sheet conveying path.
  • the opening of the flow channel is thus above the contour of the hollow profile.
  • air can flow directly into the flow channel.
  • the front edge of the traverse is at the same height or below the hollow body.
  • a part of the upper side of the hollow profile acts in the manner of an air guiding device and directs the air flowing over it in the direction of the flow channel.
  • a sheet delivery is arranged in the sheet running direction after the last printing or coating unit.
  • This includes a conveyor system with gripper system bodies and paired sprockets, over which endless conveyor chains circulate.
  • the gripper system body are frontally connected to brackets 9 with the transport chains and arranged at a distance to each other. They take over the printed and / or coated sheets 4 from the last sheet guiding cylinder or the last sheet guiding drum of the sheet-fed printing machine and transport them along a sheet conveying path to a stack carrier.
  • the respective sheet 4 is fixed at its front edge between the gripper fingers 6 of the gripper 8 and cooperating with the grippers 8 gripper catches 10.
  • the sheet baffles have openings that can be acted upon by suction or blowing air, so that e.g. an air cushion can be generated, which leads in perfecting printed sheet 4 floating, while printed only in straight printing sheet 4 are in contact with the sheet guide plate during transport to the stack carrier under the suction air effect.
  • the gripper system body comprises a box-like hollow profile 1, which extends transversely to the sheet conveying direction over the maximum format width and receives in its interior a gripper shaft 7, on which the grippers 8 are arranged.
  • the gripper shaft 7 is rotatably mounted on not shown, formed in the interior of the hollow body 1 bearing blocks and is moved via a likewise not shown, cooperating with a control cam roller lever.
  • the grippers 8 include gripper fingers 6 and cooperate with gripper catches 10, which are arranged outside of the inner space on the hollow profile 1.
  • the gripper cuffs 10 may also be provided a continuous gripper bar or a part of the hollow body 1 formed on this, planar gripper surface.
  • the grippers 8 protrude out of the interior of the hollow profile 1, which has openings on the side facing the transported sheet 4 for this purpose. Through each of the transverse to the sheet conveying direction juxtaposed openings protrude three grippers 8 and gripper fingers 6.
  • the hollow body 1 may also have an opening extending over its entire width. Likewise, a separate opening in the hollow body 1 may be provided for each gripper 8.
  • the walls of the hollow body 1 are made reinforced in the region of the gripper cuffs 10.
  • a traverse 5 On the side facing away from the sheet conveying path of the hollow profile 1, a traverse 5 is provided with a wedge-shaped cross-section parallel and spaced therefrom, which forms a flow channel 3 together with the hollow body 1.
  • the traverse 5 is connected to the hollow body 1 extending over itself in the direction of the Bogen inconvenienceweges, transversely to the Bogen inconvenienceweg spaced from each other arranged thin-walled ribs 11.
  • the pointing in the sheet conveying direction leading edge 5.1 of the cross member 5 is acute-angled and extends at a greater vertical distance to the sheet conveying path, as the hollow profile 1 extends in the vertical direction of the sheet conveying path.
  • the gripper system body is transported by the transport chains to a sheet guiding cylinder, which leads a printed and / or painted sheet.
  • a fixing of the leading edge of the sheet 4 between the gripper fingers 6 of the gripper 8 and cooperating with these gripper strikes 10.
  • the gripper system body moves with the fixed sheet 4 in the direction of the stack carrier.
  • the sheet 4 is guided on its underside on the sheet guide plate.
  • an air flow is created in the flow channel 3, which is directed into the negative pressure region which is also formed by the movement of the gripper system body behind it.
  • the vacuum applied there is compensated again in the immediate vicinity of the gripper system body, without acting on the transported sheet 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Discharge By Other Means (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Description

Die vorliegende Erfindung bezieht sich auf einen Greifersystemkörper zum Fördern von Bogen in Bogendruckmaschinen gemäß dem Oberbegriff von Patentanspruch 1.The present invention relates to a gripper system body for conveying sheets in sheet-fed presses according to the preamble of claim 1.

Derartige Greifersystemkörper sind als Bestandteil von umlaufenden Kettenfördersystemen bekannt. Die Kettenfördersysteme werden in Auslegern von Bogendruckmaschinen verwendet, in denen bedruckte Bogen von dem in Bogenförderrichtung letzten Druckoder Lackwerk abgenommen und bis zu einem Stapelträger transportiert werden, wo ihre Ablage in Form eines Auslagestapels erfolgt. Sie können auch dem Transport von bedruckten Bogen zwischen den Druck- oder Lackwerken von Bogendruckmaschinen dienen.Such gripper system bodies are known as part of circulating chain conveyor systems. The chain conveyor systems are used in cantilevers of sheet-fed printing machines in which printed sheets are removed from the last printing or coating unit in the sheet conveying direction and transported to a stack carrier, where their storage takes place in the form of a delivery stack. They can also be used to transport printed sheets between the printing or coating units of sheet-fed presses.

Die Greifersystemkörper müssen eine hohe Biegesteifigkeit aufweisen, um ein Einreißen der geförderten Bogen bei der Übernahme vom vorgeordneten Transportsystem zu vermeiden. Zudem ist eine große mechanische Festigkeit der Greifersystemkörper erforderlich, die im Bereich der meist kleinen Krümmungsradien ihrer Führungsbahn über und unmittelbar nach dem Stapelbereich starken Belastungen ausgesetzt sind. Dabei steigt die erforderliche Biegesteifigkeit der Greifersystemkörper mit der Bogenbreite und Geschwindigkeit. Weiterhin sollen die Greifersystemkörper, um Schwingungen zu vermeiden, ein geringes Gewicht aufweisen und dürfen die Bogen, die beim Einsatz von Trockner für die Trocknerstrahlung zugänglich bleiben müssen, nicht überdecken.The gripper system body must have a high flexural rigidity in order to avoid tearing of the conveyed sheet in the acquisition of the upstream transport system. In addition, a large mechanical strength of the gripper system body is required, which are exposed in the field of mostly small radii of curvature of their guideway over and immediately after the stacking area heavy loads. The required bending stiffness of the gripper system body increases with the sheet width and speed. Furthermore, the gripper system body, in order to avoid vibrations, have a low weight and may not cover the sheets, which must remain accessible when using dryers for the dryer radiation.

Aus der DE 195 27 439 A1 ist ein als Greiferbrücke bezeichneter Greifersystemkörper bekannt, der ein kastenförmiges Hohlprofil aufweist. Das Hohlprofil umschließt einen Hohlraum, der eine Greiferwelle aufnimmt, auf der eine Vielzahl von Greifern mit Greiferfingern angeordnet sind. Diese ragen durch in dem Hohlprofil vorgesehene Durchbrechungen und wirken zur Fixierung von Bogen mit Greiferauflagen zusammen. Das Hohlprofil weist im Bereich der Greiferauflagen und im entgegengesetzten Bereich eine verstärkte Wandstärke auf.
Der Nachteil dieser Lösung besteht darin, dass die Biegesteifigkeit und Festigkeit des Hohlprofils durch die Anordnung der Durchbrechungen vermindert wird. Die Verstärkung der Wände führt zu einer insgesamt hohen Biegesteifigkeit und Festigkeit, ist jedoch mit einer nachteiligen Gewichtszunahme verbunden.From the DE 195 27 439 A1 is a known as gripper jaw gripper system body known which has a box-shaped hollow profile. The hollow profile encloses a cavity which receives a gripper shaft, on which a plurality of grippers are arranged with gripper fingers. These protrude through provided in the hollow profile openings and act to fix sheets with gripper pads together. The hollow profile has an increased wall thickness in the region of the gripper pads and in the opposite area.
The disadvantage of this solution is that the bending stiffness and strength of the hollow profile is reduced by the arrangement of the openings. The reinforcement of the walls leads to an overall high flexural strength and strength, but is associated with an adverse weight gain.

Gemäß der DE 298 20 660 U1 ist es bekannt, den Grundkörper eines Greifersystemkörpers für ein umlaufendes Fördersystem einer Druckmaschine als durchbrechungsfreies Hohlprofil mit einer U-förmigen äußeren und einer inneren Wand auszubilden, die einen Hohlraum einschließen und im Bereich der Greiferauflagen in einer Wandung auslaufen. Der Grundkörper ist endseitig mit dem Fördersystem verbunden und weist Lagerböcke zur Aufnahme der Greiferwelle auf. Sowohl die Lagerböcke als auch die in diesen gelagerte Greiferwelle sind außerhalb des Hohlraums angeordnet.
Ein derartig ausgeführter Greifersystemkörper weist bei vergleichsweise niedrigem Gesamtgewicht eine hohe Biegesteifigkeit auf. Das ist jedoch mit einer verhältnismäßig großen Baugröße verbunden.
Die Folge davon ist, dass insbesondere bei hohen Fördergeschwindigkeiten hinter dem Greifersystemkörper ein Unterdruckbereich mit Wirbeln entsteht, was zum Flattern des geförderten Bogens führt und beim Erfassen der Bogen durch eine Bogenbremseinrichtung Probleme verursachen kann. Zudem wirken sich derartige Wirbel ungünstig beim Aufbringen von Puder aus und erschweren einen gleichmäßigen Puderauftrag. Die Wirkung der Pudereinrichtung wird reduziert, was zu einer hohen Verschmutzung des Auslegers führt, die nicht mit Puderabsaugsystemen kompensiert werden kann.According to the DE 298 20 660 U1 It is known to form the body of a gripper system body for a revolving conveyor system of a printing machine as a break-free hollow profile with a U-shaped outer and inner wall, which enclose a cavity and leak in the region of the gripper pads in a wall. The main body is connected at the end to the conveyor system and has bearing blocks for receiving the gripper shaft. Both the bearing blocks and the gripper shaft mounted in these are arranged outside the cavity.
Such a designed gripper system body has a high bending stiffness at a comparatively low total weight. However, this is associated with a relatively large size.
The consequence of this is that, in particular at high conveying speeds behind the gripper system body, a negative pressure area arises with vortices, which leads to fluttering of the conveyed sheet and can cause problems when detecting the sheets by a sheet braking device. In addition, such vortexes adversely affect the application of powder and complicate a uniform powder application. The effect of the powder device is reduced, resulting in a high contamination of the boom, which can not be compensated with Puderabsaugsystemen.

Um einer Wirbelbildung entgegenzuwirken und den Bogenlauf zu beruhigen, wird in der DE 198 47 399 A1 vorgeschlagen, einen als Greiferwagen bezeichneten Greifersystemkörper mit Luftleitschild zu versehen. Der Greifersystemkörper besteht aus einer Traverse, Greifern und Greiferauflagen und trägt in Bogenlaufrichtung vorn ein über die Breite des Bogenförderweges reichendes Luftleitschild, das steuerbar am Greiferwagen angeordnet ist.
Der Nachteil besteht darin, dass ein derartiger Greifersystemkörper ein relativ großes Gesamtgewicht aufweist und so stabil ausgeführt sein muss, dass er das zusätzliche Gewicht des Luftleitschildes zu tragen vermag, ohne dass das Material des Luftleitschildes zur Erhöhung der Biegesteifigkeit des Greifersystemkörpers beiträgt.To counteract a vortex formation and to calm the sheet run, is in the DE 198 47 399 A1 proposed to provide a designated gripper carriage gripper system body with Luftleitschild. The gripper system body consists of a traverse, grippers and gripper pads and carries in the sheet travel direction forward over the width of the sheet conveying path reaching louver, which is arranged controllably on the gripper carriage.
The disadvantage is that such a gripper system body has a relatively large total weight and must be made stable so that it can carry the additional weight of the Luftleitschildes without the material of the Luftleitschildes contributes to increase the flexural rigidity of the gripper system body.

Ein Greifersystemkörper gemäß dem Oberbegriff von Anspruch 1 ist aus der DE-A-33 08 844 bekannt.A gripper system body according to the preamble of claim 1 is known from DE-A-33 08 844 known.

Es ist nun Aufgabe der vorliegenden Erfindung einen Greifersystemkörper zum Fördern von Bogen in Bogendruckmaschinen zu schaffen, der bei geringem Gewicht große Biegesteifigkeit und Festigkeit aufweist und beim Transport der Bogen keine den Bogenlauf störenden Luftströmungen erzeugt.It is therefore an object of the present invention to provide a gripper system body for conveying sheets in sheet-fed presses, which has high bending stiffness and strength at low weight and does not produce the arc run disturbing air currents during transport of the sheet.

Erfindungsgemäß wird diese Aufgabe mit einem Greifersystemkörper der eingangs genannten Art gelöst, der die Merkmale des Patentanspruchs 1 aufweist.According to the invention this object is achieved with a gripper system body of the type mentioned, having the features of claim 1.

Der erfindungsgemäße Greifersystemkörper hat den Vorteil, dass er hohe Biegesteifigkeit und große Festigkeit mit vorteilhaften strömungstechnischen Eigenschaften verbindet.The gripper system body according to the invention has the advantage that it combines high bending stiffness and high strength with advantageous fluidic properties.

Durch die Anordnung einer Traverse im Abstand zum Hohlprofil wird an einer Stelle Material konzentriert, an der es im größtmöglichen Maß zur Erhöhung von Biegesteifigkeit und Festigkeit beiträgt. Durch die Anordnung der Greiferwelle und der Greifer im Inneren des Hohlprofils sind diese gegen Verschmutzung z.B. durch Puder geschützt. In dem zwischen der Traverse und dem Hohlprofil ausgebildeten Strömungskanal ist durch Bewegen des Greifersystemkörpers in Bogenförderrichtung eine Luftströmung erzeugbar. Die Luftströmung ist auf den Bogenförderweg gerichtet und führt Luft in den infolge der Bewegung des Greifersystemkörpers in Bogenförderrichtung hinter diesem entstehenden verwirbelten Unterdruckbereich. Dadurch wird der anliegende Unterdruck ausgeglichen und einer Entstehung entgegengewirkt, ohne dass es zu negativen Beeinflussungen der Bogenführung kommt.
Der hinter dem Greifersystemkörper entstehende Unterdruck ist dabei abhängig von der Bewegungsgeschwindigkeit. Mit der Zunahme der Bewegungsgeschwindigkeit verstärkt sich auch die Strömung im Strömungskanal, wodurch dem Unterdruckbereich ein größeres Luftvolumen zugeführt wird. Die vorteilhafter Wirkung des erfindungsgemäßen Greifersystemkörpers ist damit unabhängig von der Geschwindigkeit.The arrangement of a traverse at a distance from the hollow profile material is concentrated at one point, where it contributes to the greatest extent to increase bending stiffness and strength. The arrangement of the gripper shaft and the gripper inside the hollow profile, these are protected against contamination, for example by powder. In the flow channel formed between the traverse and the hollow profile, an air flow can be generated by moving the gripper system body in the sheet conveying direction. The air flow is directed towards the sheet conveying path and introduces air into the swirling negative pressure area resulting from the movement of the gripper system body in the sheet conveying direction. As a result, the applied negative pressure is compensated and counteracted an emergence, without resulting in negative effects on the sheet guide.
The resulting behind the gripper system body vacuum is dependent on the speed of movement. As the speed of movement increases, so does the flow in the flow channel, which adds a larger volume of air to the negative pressure area. The advantageous effect of the gripper system body according to the invention is thus independent of the speed.

Gemäß einer Weiterbildung der Erfindung ist der Strömungskanal derart ausgeführt, dass die Luftströmung in einem Winkel zwischen 35 und 45 Grad geneigt zum Bogenförderweg ausgerichtet ist.According to one embodiment of the invention, the flow channel is designed such that the air flow is oriented at an angle between 35 and 45 degrees inclined to the sheet conveying path.

Eine Verbindung zwischen dem Hohlkörper und der Traverse kann über sich in Richtung des Bogenförderweges erstreckende, quer zum Bogenförderweg beabstandet zueinander angeordnete Rippen bzw. Stege erfolgen. Diese weisen quer zum Bogenförderweg eine Ausdehnung auf, die um ein Vielfaches kleiner ist als der Abstand der Rippen zueinander. Dadurch bildet sich ein über die gesamte Breite des Bogenförderweges annähernd gleicher Strömungsquerschnitt aus und die Steifigkeit des gesamten System wird erhöht.A connection between the hollow body and the traverse can take place in the direction of the Bogenförderweges extending, transversely to the sheet conveying path spaced from each other arranged ribs or webs. These have transversely to the sheet conveying path to an extent which is many times smaller than the distance between the ribs to each other. As a result, over the entire width of the Bogenförderweges approximately the same flow cross-section is formed and the rigidity of the entire system is increased.

Nach einer andern Weiterbildung der Erfindung weist das Hohlprofil auf der dem Bogenförderweg abgewandten Seite einen Querschnitt mit konvexer Krümmung auf. Dadurch wird der Strömungswiderstand des Greifersystemkörpers verringert. Die konvexe Krümmung verläuft entgegen der Bogenförderrichtung betrachtet, vorzugsweise abgeflacht. Das Hohlprofil kann nach einer anderen strömungstechnisch optimierten Ausführung einen tropfenförmigen Querschnitt aufweisen. Diese Ausführungsformen haben gemeinsam, dass sie scharfe Körperkanten vermeiden, an denen die Entstehung von Unterdruckzonen und das Abreißen der Strömung begünstigt wird.According to another embodiment of the invention, the hollow profile on the side facing away from the Bogenförderweg a cross section with a convex curvature. This reduces the flow resistance of the gripper system body. The convex curvature is considered counter to the sheet conveying direction, preferably flattened. The hollow profile may have a drop-shaped cross-section according to another aerodynamically optimized design. These embodiments have in common that they avoid sharp body edges, where the formation of vacuum zones and the tearing of the flow is favored.

Aus dem gleichen Grund ist die Traverse bevorzugt so ausgeführt, dass sie einen geringen Luftwiderstand aufweist, was durch einen keil- oder tropfenförmigen Querschnitt erreicht wird.For the same reason, the traverse is preferably designed so that it has a low air resistance, which is achieved by a wedge-shaped or drop-shaped cross section.

Der Strömungskanal ist bevorzugt mit einem in Richtung der Luftströmung gleichbleibenden Querschnitt ausgebildet. Die Wahl des Querschnittes hängt dabei von der Form des Hohlkörpers und damit den Parametern der Unterdruckzone ab, so dass auch sich erweiternde oder verjüngende Querschnitte vorgesehen sein können.The flow channel is preferably formed with a constant in the direction of the air flow cross-section. The choice of the cross section depends on the shape of the hollow body and thus the parameters of the negative pressure zone, so that also widening or tapering cross sections can be provided.

Von entscheidendem Einfluss auf die im Strömungskanal geschwindigkeitsabhängig anliegenden Strömungen ist die Gestaltung des in Bogenförderrichtung betrachtet vorderen Bereichs des Strömungskanals. Eine starke Strömung lässt sich realisieren, indem die Traverse mit einer in Bogenförderrichtung betrachtet spitzwinkligen Vorderkante ausgebildet ist, die im größeren vertikalen Abstand zum Bogenförderweg verläuft, als sich das Hohlprofil in vertikaler Richtung vom Bogenförderweg erstreckt. Die Öffnung des Strömungskanals liegt damit oberhalb der Kontur des Hohlprofils. Bei dieser Ausführung kann Luft auf direktem Weg in den Strömungskanal einströmen. Ebenso ist es möglich, den Strömungskanal derart auszubilden, dass die vordere Kante der Traverse auf gleicher Höhe oder unterhalb des Hohlkörpers liegt. In diesem Fall wirkt ein Teil der Oberseite des Hohlprofils in Art einer Luftleiteinrichtung und lenkt die über ihn strömende Luft in Richtung des Strömungskanals.Of decisive influence on the speed-dependently applied flows in the flow channel is the design of the viewed in the sheet conveying direction front region of the flow channel. A strong flow can be realized by the traverse is formed with an acute-angled leading edge viewed in the sheet conveying direction, which runs in the greater vertical distance to the sheet conveying path, as the hollow profile extends in the vertical direction of the sheet conveying path. The opening of the flow channel is thus above the contour of the hollow profile. In this embodiment, air can flow directly into the flow channel. It is also possible to form the flow channel such that the front edge of the traverse is at the same height or below the hollow body. In this case, a part of the upper side of the hollow profile acts in the manner of an air guiding device and directs the air flowing over it in the direction of the flow channel.

Nachfolgend soll die Erfindung anhand eines Ausführungsbeispiels beschrieben werden.The invention will be described with reference to an embodiment.

In der dazugehörigen Zeichnung zeigt:

Fig. 1
eine geschnittene Seitenansicht des Greifersystemkörpers und
Fig. 2
eine Draufsicht auf den Greifersystemkörper in Bogenförderrichtung.
In the accompanying drawing shows:
Fig. 1
a sectional side view of the gripper system body and
Fig. 2
a plan view of the gripper system body in the sheet conveying direction.

In einer Bogendruckmaschine ist in Bogenlaufrichtung nach dem letzten Druck- oder Lackwerk ein Bogenausleger angeordnet. Dieser umfasst ein Fördersystem mit Greifersystemkörpern und paarweise angeordneten Kettenrädern, über die endlose Transportketten umlaufen. Die Greifersystemkörper sind stirnseitig an Halterungen 9 mit den Transportketten verbunden und im Abstand zueinander angeordnet. Sie übernehmen die bedruckten und/oder lackierten Bogen 4 von dem letzten Bogenführungszylinder oder der letzten Bogenführungstrommel der Bogendruckmaschine und transportieren sie entlang eines Bogenförderweges zu einem Stapelträger. Dazu wird der jeweilige Bogen 4 an seiner Vorderkante zwischen den Greiferfingern 6 der Greifer 8 und den mit den Greifern 8 zusammenwirkenden Greiferaufschlägen 10 fixiert.In a sheet-fed printing machine, a sheet delivery is arranged in the sheet running direction after the last printing or coating unit. This includes a conveyor system with gripper system bodies and paired sprockets, over which endless conveyor chains circulate. The gripper system body are frontally connected to brackets 9 with the transport chains and arranged at a distance to each other. They take over the printed and / or coated sheets 4 from the last sheet guiding cylinder or the last sheet guiding drum of the sheet-fed printing machine and transport them along a sheet conveying path to a stack carrier. For this purpose, the respective sheet 4 is fixed at its front edge between the gripper fingers 6 of the gripper 8 and cooperating with the grippers 8 gripper catches 10.

Unterhalb des Bogenförderweges sind vorzugsweise als Bogenleitbleche ausgebildete Bogenleiteinrichtungen 2 vorgesehen, die die Bogen 4 auf der Bogenunterseite führen. Die Bogenleitbleche weisen Öffnungen auf, die mit Saug- oder Blasluft beaufschlagt werden können, so dass z.B. ein Luftpolster erzeugbar ist, das im Schön- und Widerdruck bedruckte Bogen 4 schwebend führt, während ausschließlich im Schöndruck bedruckte Bogen 4 beim Transport zum Stapelträger unter der Saugluftwirkung in Kontakt mit dem Bogenleitblech stehen.Below the Bogenförderweges preferably designed as a sheet guide sheet guide devices 2 are provided which guide the sheet 4 on the underside of the sheet. The sheet baffles have openings that can be acted upon by suction or blowing air, so that e.g. an air cushion can be generated, which leads in perfecting printed sheet 4 floating, while printed only in straight printing sheet 4 are in contact with the sheet guide plate during transport to the stack carrier under the suction air effect.

Der Greifersystemkörper umfasst ein kastenartiges Hohlprofil 1, das sich quer zur Bogenförderrichtung über die maximale Formatbreite erstreckt und in seinem Innenraum eine Greiferwelle 7 aufnimmt, auf der die Greifer 8 angeordnet sind. Die Greiferwelle 7 ist auf nicht dargestellten, im Inneren des Hohlkörpers 1 ausgebildeten Lagerböcken drehbar gelagert und wird über einen ebenfalls nicht dargestellten, mit einer Steuerkurve zusammenwirkenden Rollenhebel bewegt. Die Greifer 8 umfassen Greiferfinger 6 und wirken mit Greiferaufschlägen 10 zusammen, die außerhalb des Innenraums am Hohlprofil 1 angeordnet sind. Statt der Greiferaufschläge 10 kann auch eine durchgehende Greiferaufschlagleiste oder eine als Bestandteil des Hohlkörpers 1 an diesem ausgebildete, plane Greiferaufschlagfläche vorgesehen sein.The gripper system body comprises a box-like hollow profile 1, which extends transversely to the sheet conveying direction over the maximum format width and receives in its interior a gripper shaft 7, on which the grippers 8 are arranged. The gripper shaft 7 is rotatably mounted on not shown, formed in the interior of the hollow body 1 bearing blocks and is moved via a likewise not shown, cooperating with a control cam roller lever. The grippers 8 include gripper fingers 6 and cooperate with gripper catches 10, which are arranged outside of the inner space on the hollow profile 1. Instead of the gripper cuffs 10 may also be provided a continuous gripper bar or a part of the hollow body 1 formed on this, planar gripper surface.

Die Greifer 8 ragen aus dem Inneren des Hohlprofils 1 heraus, das auf der dem transportierten Bogen 4 zugewandten Seite zu diesem Zweck Öffnungen aufweist. Durch jede der quer zur Bogenförderrichtung nebeneinander angeordneten Öffnungen ragen drei Greifer 8 bzw. Greiferfinger 6. Der Hohlkörper 1 kann auch eine sich über seine gesamte Breite erstreckende Öffnung aufweisen. Ebenso kann für jeden Greifer 8 eine separate Öffnung im Hohlkörper 1 vorgesehen sein.
Auf der vom Bogenförderweg während des Transports des jeweiligen Bogen 4 abgewandten Seite weist der Querschnitt des Hohlkörpers 1 eine konvexe Krümmung auf, die entgegen der Bogenförderrichtung abgeflacht verläuft. Die Wandungen des Hohlkörpers 1 sind im Bereich der Greiferaufschläge 10 verstärkt ausgeführt.The grippers 8 protrude out of the interior of the hollow profile 1, which has openings on the side facing the transported sheet 4 for this purpose. Through each of the transverse to the sheet conveying direction juxtaposed openings protrude three grippers 8 and gripper fingers 6. The hollow body 1 may also have an opening extending over its entire width. Likewise, a separate opening in the hollow body 1 may be provided for each gripper 8.
On the side facing away from the Bogenförderweg during the transport of the respective sheet 4, the cross section of the hollow body 1 has a convex curvature which is flattened against the sheet conveying direction. The walls of the hollow body 1 are made reinforced in the region of the gripper cuffs 10.

Auf der dem Bogenförderweg abgewandten Seite des Hohlprofils 1 ist parallel und im Abstand zu diesem eine Traverse 5 mit einem keilförmigen Querschnitt vorgesehen, die zusammen mit dem Hohlkörper 1 einen Strömungskanal 3 bildet. Die Traverse 5 ist über sich in Richtung des Bogenförderweges erstreckende, quer zum Bogenförderweg beabstandet zueinander angeordnete dünnwandige Rippen 11 mit dem Hohlkörper 1 verbunden.
Die in Bogenförderrichtung zeigende Vorderkante 5.1 der Traverse 5 ist spitzwinklig ausgebildet und verläuft in einem größeren vertikalen Abstand zum Bogenförderweg, als sich das Hohlprofil 1 in vertikaler Richtung vom Bogenförderweg erstreckt.On the side facing away from the sheet conveying path of the hollow profile 1, a traverse 5 is provided with a wedge-shaped cross-section parallel and spaced therefrom, which forms a flow channel 3 together with the hollow body 1. The traverse 5 is connected to the hollow body 1 extending over itself in the direction of the Bogenförderweges, transversely to the Bogenförderweg spaced from each other arranged thin-walled ribs 11.
The pointing in the sheet conveying direction leading edge 5.1 of the cross member 5 is acute-angled and extends at a greater vertical distance to the sheet conveying path, as the hollow profile 1 extends in the vertical direction of the sheet conveying path.

Nachfolgend soll die Wirkungsweise der Erfindung beschrieben werden.
Der Greifersystemkörper wird von den Transportketten zu einem Bogenführungszylinder, der einen bedruckten und/oder lackierten Bogen führt, transportiert. Durch Verdrehen der Greiferwelle 7 erfolgt eine Fixierung der Vorderkante des Bogens 4 zwischen den Greiferfingern 6 der Greifer 8 und den mit diesen zusammenwirkenden Greiferaufschlägen 10. Anschließend bewegt sich der Greifersystemkörper mit dem fixierten Bogen 4 in Richtung des Stapelträgers. Dabei wird der Bogen 4 auf seiner Unterseite auf dem Bogenleitblech geführt.
In Folge der Bewegung des Greifersystemkörpers entsteht im Strömungskanal 3 eine Luftströmung, die in den ebenfalls durch die Bewegung des Greifersystemkörpers hinter diesem entstehenden Unterdruckbereich gerichtet ist. Der dort anliegende Unterdruck wird in unmittelbarer Nähe des Greifersystemkörpers bereits wieder kompensiert, ohne auf den transportierten Bogen 4 zu wirken.The operation of the invention will be described below.
The gripper system body is transported by the transport chains to a sheet guiding cylinder, which leads a printed and / or painted sheet. By rotating the gripper shaft 7, a fixing of the leading edge of the sheet 4 between the gripper fingers 6 of the gripper 8 and cooperating with these gripper strikes 10. Subsequently, the gripper system body moves with the fixed sheet 4 in the direction of the stack carrier. The sheet 4 is guided on its underside on the sheet guide plate.
As a result of the movement of the gripper system body, an air flow is created in the flow channel 3, which is directed into the negative pressure region which is also formed by the movement of the gripper system body behind it. The vacuum applied there is compensated again in the immediate vicinity of the gripper system body, without acting on the transported sheet 4.

Bezugszeichenreference numeral

11
Hohlprofilhollow profile
22
Bogenleiteinrichtungsheet guiding device
33
Strömungskanalflow channel
44
Bogenbow
55
Traversetraverse
5.15.1
Vorderkanteleading edge
66
Greiferfingergripper fingers
77
Greiferwellegripper shaft
88th
Greifergrab
99
Halterungbracket
1010
Greiferaufschlaggripper
1111
Ripperib

Claims (12)

  1. Gripper system body for conveying sheets in sheet printing machines, which is moved by encircling transport chains along a sheet conveying path and comprises a box-like hollow profile member (1), which carries gripper abutments (10) and which receives in the interior a gripper shaft (7) carrying grippers (8) protruding out of the hollow profile member (1) and co-operating with the gripper abutments (10), characterised by a cross member (5), which is connected with the hollow profile member (1) and arranged at a spacing from the hollow profile member (1) and which forms therewith a flow channel (3) in which an air flow directed towards the sheet conveying path can be generated by movement of the gripper system body in sheet conveying direction.
  2. Gripper system body according to claim 1, characterised in that the air flow is oriented at an angle of 35 to 45 degrees inclined with respect to the sheet conveying path.
  3. Gripper system body according to claim 1, characterised in that the cross member (5) is connected with the hollow body (1) by way of ribs (11) arranged transversely to the sheet conveying path at a spacing from one another.
  4. Gripper system body according to claim 3, characterised in that the ribs (11) have a length which is transverse to the sheet conveying path and which is smaller by a multiple than the spacing of the ribs (11) from one another.
  5. Gripper system body according to claim 1, characterised in that the hollow profile member (1) considered in cross-section has a convex curvature on the side remote from the sheet conveying path.
  6. Gripper system body according to claim 5, characterised in that the curvature runs flatly against the sheet conveying direction.
  7. Gripper system body according to claim 1, characterised in that the hollow profile member (1) has an approximately drop-shaped cross-section.
  8. Gripper system body according to claim 1, characterised in that the cross member (5) has an approximately wedge-shaped cross-section.
  9. Gripper system body according to claim 1, characterised in that the cross member (5) has the same length transversely to the sheet conveying path as the hollow profile member (1).
  10. Gripper system body according to claim 1, characterised in that the flow channel (3) has a cross-section which is constant in the direction of the air flow.
  11. Gripper system body according to claim 1, characterised in that considered in sheet conveying direction a wedge-shaped front edge (5.1) is formed at the cross member (5) and extends at a greater vertical spacing from the sheet conveying path than the hollow profile member (1) extends in vertical direction from the sheet conveying path.
  12. Gripper system body according to claim 1, characterised in that a gripper abutment surface constructed at the hollow profile member (1) is provided as gripper abutment (10).
EP20030025172 2002-11-29 2003-11-04 Gripper body for conveying sheets in a sheet printing press Expired - Fee Related EP1424196B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002155948 DE10255948B3 (en) 2002-11-29 2002-11-29 Gripper system for sheet feed in printing machine has flow channel providing air stream assisting sheet feed upon movement of gripper system
DE10255948 2002-11-29

Publications (2)

Publication Number Publication Date
EP1424196A1 EP1424196A1 (en) 2004-06-02
EP1424196B1 true EP1424196B1 (en) 2010-10-20

Family

ID=31502567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030025172 Expired - Fee Related EP1424196B1 (en) 2002-11-29 2003-11-04 Gripper body for conveying sheets in a sheet printing press

Country Status (2)

Country Link
EP (1) EP1424196B1 (en)
DE (2) DE10255948B3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007057730A1 (en) 2007-11-30 2009-06-04 Koenig & Bauer Aktiengesellschaft Gripper system body i.e. gripper carriage, for transporting sheet in sheet-manufacturing machine i.e. print machine, has turbulence generators attached to gripper system body for producing turbulence to prevent or reduce large air vortex
DE102007057729B4 (en) 2007-11-30 2019-05-02 Koenig & Bauer Ag Gripper system body for transporting sheets in sheet-processing machines, in particular printing machines
DE102009047182A1 (en) 2009-11-26 2011-06-01 Koenig & Bauer Aktiengesellschaft Delivery device for sheet-processing machine, has pick-up carrier moved along transport plane for transporting sheets to corner
DE102010003860A1 (en) * 2010-04-12 2011-10-13 Manroland Ag Gripper system for use in sheet-fed printing machine, has detected gripper shaft deformed in position under increase of flexural rigidity of printed sheet by translational displacement of grippers in longitudinal direction
DE102011087625A1 (en) 2011-01-03 2012-07-05 Koenig & Bauer Aktiengesellschaft Sheet conveying apparatus has sheet guiding element with Venturi nozzles that are arranged with compressed-air orifices for blowing air stream in sheet conveying direction, and for adjusting flow of air stream
DE102019134717A1 (en) * 2019-12-17 2021-06-17 Koenig & Bauer Ag Sheet processing machine with a transport system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU895862A1 (en) * 1979-10-30 1982-01-07 Всесоюзный Научно-Исследовательский Институт Полиграфического Машиностроения Apparatus for conveying and piling sheet materials
DD207519A1 (en) * 1982-06-01 1984-03-07 Ulrich Hahn GRIPPING CARTS IN EQUIPMENT OF ARC PRINTING MACHINES
DD239987A1 (en) * 1985-08-06 1986-10-15 Polygraph Leipzig DEVICE FOR SUPPORTING THE BOWS IN EQUIPMENT OF ARC PRESSURE MACHINES
JP3606679B2 (en) * 1995-06-20 2005-01-05 ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフト A device that stabilizes the conveyance of a sheet in a sheet processing machine, especially a sheet rotary printing press.
DE19527439C2 (en) * 1995-07-27 2002-10-24 Heidelberger Druckmasch Ag Gripper bridge for printing machine arms
DE19848453A1 (en) * 1997-11-18 1999-05-20 Heidelberger Druckmasch Ag Chain conveyor for moving sheets in printing machines
DE19810718A1 (en) * 1998-03-12 1999-09-16 Heidelberger Druckmasch Ag Printing machine paper sheet transporter
DE19847399B4 (en) * 1998-10-14 2008-06-19 Koenig & Bauer Aktiengesellschaft Gripper carriage in outriggers of sheet-fed presses
DE29820660U1 (en) * 1998-11-18 1999-02-11 MAN Roland Druckmaschinen AG, 63075 Offenbach Hollow profiled gripper system body

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Publication number Publication date
DE10255948B3 (en) 2004-03-11
DE50313202D1 (en) 2010-12-02
EP1424196A1 (en) 2004-06-02

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