EP0213397B1 - Spring-mounted gripper for sheet-fed rotary printing machines - Google Patents

Spring-mounted gripper for sheet-fed rotary printing machines Download PDF

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Publication number
EP0213397B1
EP0213397B1 EP86110491A EP86110491A EP0213397B1 EP 0213397 B1 EP0213397 B1 EP 0213397B1 EP 86110491 A EP86110491 A EP 86110491A EP 86110491 A EP86110491 A EP 86110491A EP 0213397 B1 EP0213397 B1 EP 0213397B1
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EP
European Patent Office
Prior art keywords
gripper
finger
spring
support
gripper finger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86110491A
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German (de)
French (fr)
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EP0213397A2 (en
EP0213397A3 (en
Inventor
Rudolf Raab
Manfred Herold
Peter Hummel
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Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Priority to AT86110491T priority Critical patent/ATE44908T1/en
Publication of EP0213397A2 publication Critical patent/EP0213397A2/en
Publication of EP0213397A3 publication Critical patent/EP0213397A3/en
Application granted granted Critical
Publication of EP0213397B1 publication Critical patent/EP0213397B1/en
Expired legal-status Critical Current

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    • 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
    • B41F21/10—Combinations of transfer drums and grippers
    • B41F21/104—Gripper details

Definitions

  • the invention relates to a resilient gripper for sheet-fed rotary printing machines according to the preamble of the first claim.
  • resilient grippers are designed in such a way that they can evenly absorb the tension that is exerted on the grippers by the paper. Since a slight pulling out of the paper from the gripper causes doubling or registration problems, one always tries to design the gripper with the maximum holding force. This means that the gripper springs have a very steep characteristic. The bearing clearances of all grippers must also be kept very tight, since the slightest air automatically affects fitting or doubling when closing. This small bearing play inevitably leads to high friction of the grippers at the bearing point, i.e. that part of the closing spring force is consumed in the bearing itself. It also follows from this that the bearings of the gripper shaft must be kept very stable in order to absorb deformation when the grippers close impulsively. A disadvantage of this is the creation of very high mass forces.
  • DD-PS 66 634 From DD-PS 66 634 it is known to support a one-piece gripper lever on a gripper shaft and to adjust its pretensioning force by means of two compression springs.
  • the disadvantage is that the gripper lever loses its statically determined position if the most possible possible compensation of the bearing force is to be achieved. With very high machine speeds and increased pretensioning forces, insufficient centering, e.g. possible due to disturbing vibrations that are introduced into the machine.
  • Another disadvantage is the relatively large radius of inertia and the mass of the vibrating parts for initiating the holding process.
  • a gripper is known in which the axis of the gripper finger joint is pivotally mounted in a swivel joint parallel to the gripper shaft, the axis of the gripper finger joint being located approximately on the straight line extending away from the gripper tip, which is the supporting surface for the gripper tip connects to the axis of the gripper shaft.
  • the geometry shown in FIG. 1 shows that the force exerted by the gripper tip on the gripper support still has a component in the direction of sheet travel. As a result, there is still a risk of the arc shifting, as well as a possible torsion of the gripper shaft under high pretensioning forces, although an improvement over conventional grippers with a circular movement about the gripper shaft axis can be achieved.
  • a vertically closing gripper with a controlled gripper shaft is known from DE-PS 2 030 040.
  • a disadvantage is the frictional control of the gripper shaft relative to the fulcrum of a control lever by means of a guide on the control cam.
  • the additional control effort leads to an increase in the inertial forces of the system vibrating with a large radius of inertia and thus to a reduction in the performance of the printing press.
  • the control cam is heavily soiled, it is no longer possible to guide the second, vertical movement phase exactly.
  • the invention has for its object to give the gripper finger in a gripper of the type mentioned without risk of bulging in the second movement phase a positive movement perpendicular to the gripper pad by means of a straight guide.
  • the advantages of the solution according to the invention are that neither disturbing forces nor vibrations can have an effect in an extended speed range with increased pretensioning forces and overpressures in the direction of sheet travel.
  • the holding effect is improved by precise straight guidance of the vertical closing process, the gripper finger always maintaining its statically determined position and not reacting so sluggishly.
  • FIGS 1 to 3 show the structure of the gripper.
  • a groove 2 is incorporated in a cylinder 1, in which a gripper shaft 3 with a fixed axis is mounted.
  • a clamping piece 4 is clamped on the gripper shaft 3.
  • the stop piece 8 is loosely mounted on the gripper shaft 3 and is limited in its movement by the clamping piece 4 axially and under the action of a compression spring 15 radially by a first cylindrical pin 9 fastened in the clamping piece 4.
  • a hook-shaped gripper finger 11 is supported with its lower end on a second cylindrical pin 10, which is also fastened in the clamping piece 4.
  • the pretensioned hook-shaped gripper finger 11 is movable in a longitudinally movable manner on a guide pin 12 of the stop piece 8 in a ball bushing 13 in a second movement phase, and is supported in a spring-loaded manner by a compression spring 14.
  • the hook-shaped gripper finger 11 is also guided in parallel against rotation in the clamping piece 4 and can be provided with the basic setting parallel to the gripper support 5 by means of the adjusting screw 16.
  • the first cylindrical pin 9 is first released, so that the hook-shaped gripper finger 11 is guided to the gripper pad 5 in the second movement phase, free of play, in a longitudinally movable manner following the rotating movement phase.
  • the second cylinder pin 10 is released at the end of the vertical movement phase as soon as the hook-shaped gripper finger 11 rests on the paper to be gripped on the gripper support 5.
  • the gripper is shown schematically in three different positions in FIGS. From the open position (FIG. 4), the stop piece 8 first strikes the adjusting screw 16 in the strip 7 when the gripper shaft 3 is rotated, the gripper tip being still open about 1 mm. 5 and 6, in a second movement phase, there is a longitudinal movement without play perpendicular to the gripper support 5 of the hook-shaped gripper 11 on the guide pin 12 of the stop piece 8, the cylinder pins 9 and 10 then being released as described until the gripper is completely closed. As a result, a positionally accurate transfer between the cylinder 1 and a second cylinder or a drum is achieved, the hook-shaped gripper finger 11 being guided vertically in the last movement phase with high stability and accuracy.
  • the gripper finger 11 can additionally be supported laterally on the gripper support 5 by means of a support roller 17, which can be adjusted by eccentric mounting in a known manner, in order to maintain the statically determined position of the gripper finger 11 even under the greatest bending stresses.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Discharge By Other Means (AREA)

Abstract

A resilient sheet gripper for a sheet-fed rotary printing press having a gripper shaft to which is secured a pivoting clamping member in resilient relationship with a pivoted gripper finger having adjustable biasing provided by compression spring means, is provided including an adjusting screw mounted in a stop strip, an abutment for contacting the screw mounted for movement around the gripper shaft, a guide pin fixed to the abutment and disposed in a biased conical sleeve in the gripper finger so that the finger can move perpendicular to a gripper support upon closure of the gripper finger.

Description

Die Erfindung betrifft einen federnden Greifer für Bogenrotationsdruckmaschinen nach dem Oberbegriff des ersten Patentanspruchs.The invention relates to a resilient gripper for sheet-fed rotary printing machines according to the preamble of the first claim.

Bekanntlich sind federnde Greifer so gestaltet, daß sie den Zug, der vom Papier auf die Greifer ausgeübt wird, über Kraftschluß gleichmäßig aufnehmen können. Da ein geringfügiges Herausziehen des Papiers aus dem Greifer Doublier- bzw. Passerprobleme hervorruft, ist man immer bestrebt, den Greifer mit der maximalen Haltekraft auszulegen. Dies führt dazu, daß die Greiferfedern eine sehr steile Kennlinie haben. Die Lagerspiele aller Greifer müssen ebenfalls sehr eng gehalten werden, da sich die geringste Luft beim Schließen automatisch auf das Passen bzw. Doublieren auswirkt. Mit diesem geringen Lagerspiel ist zwangsläufig eine hohe Reibung der Greifer an der Lagerstelle verbunden, d.h., daß ein Teil der Schließfederkraft im Lager selbst aufgezehrt wird. Ferner ergibt sich hieraus, daß die Lager der Greiferwelle sehr stabil gehalten werden müssen, um eine Verformung beim impulsartigen Schließen der Greifer abzufangen. Ein Nachteil hieraus ist das Entstehen sehr hoer Massenkräfte.As is known, resilient grippers are designed in such a way that they can evenly absorb the tension that is exerted on the grippers by the paper. Since a slight pulling out of the paper from the gripper causes doubling or registration problems, one always tries to design the gripper with the maximum holding force. This means that the gripper springs have a very steep characteristic. The bearing clearances of all grippers must also be kept very tight, since the slightest air automatically affects fitting or doubling when closing. This small bearing play inevitably leads to high friction of the grippers at the bearing point, i.e. that part of the closing spring force is consumed in the bearing itself. It also follows from this that the bearings of the gripper shaft must be kept very stable in order to absorb deformation when the grippers close impulsively. A disadvantage of this is the creation of very high mass forces.

Insgesamt kann man sagen, daß bekannte Greifersysteme zum Steuern sehr hohe Kräfte benötigen, die nur z.T. zur Haltekraft des Bogens genutzt werden können und/oder daß durch diese hohen Kräfte, schlagartig auftretend, Störschwingungen in die Maschine eingebracht werden.All in all, it can be said that known gripper systems require very high forces to control, which in some cases only. can be used to hold the bow and / or that these high forces, suddenly occurring, introduce disturbing vibrations into the machine.

Aus der gattungsbildenden CH-A 485 597 ist es zwar bekannt, einen Greifer mittels Klemmstück an einer eine ortsfeste Achse aufweisenden schwenkbaren Greiferwelle zu lagern und einen federnden Greiferfinger in einer ersten Bewegungsphase eine Kreisbewegung um die Greiferwellenachse und in einer zweiten Bewegungsphase eine in bezug auf die Greiferauflage annähernd senkrechte Bewegung zu erteilen. Diese Greiferanordnung wirkt aber mit einer kraftschlüssig arbeitenden parallelen Blattfederanordnung und einem Greiferfinger zusammen, der keine großen Schließkräfte erträgt, ohne zu beulen. Der Greifer ist demnach für möglichst hohe Schließkräfte völlig ungeeignet.From the generic CH-A 485 597 it is known to mount a gripper by means of a clamping piece on a pivotable gripper shaft having a fixed axis and a resilient gripper finger in a first movement phase a circular movement around the gripper shaft axis and in a second movement phase one in relation to the Gripper pad to give almost vertical movement. However, this gripper arrangement interacts with a non-positively operating parallel leaf spring arrangement and a gripper finger that cannot withstand large closing forces without bulging. The gripper is therefore completely unsuitable for the highest possible closing forces.

Aus der DD-PS 66 634 ist es bekannt, einen einteiligen Greiferhebel auf einer Greiferwelle abzustützen und dessen Vorspannkraft durch zwei Druckfedern einzustellen. Von Nachteil ist, daß der Greiferhebel seine statisch bestimmte Lage verliert, wenn eine möglichst vollständige Kompensation der Lagerkraft erreicht werden soll. Bei sehr hohen Maschinengeschwindigkeiten und erhöhten Vorspannkräften ist keine ausreichende Zentrierung, z.B. infolge Störschwingungen, die in die Maschine eingebracht werden, mehr möglich. Von Nachteil sind ferner der verhältnismäßig große Trägheitsradius und die Masse der schwingenden Teile für das Einleiten des Haltevorganges.From DD-PS 66 634 it is known to support a one-piece gripper lever on a gripper shaft and to adjust its pretensioning force by means of two compression springs. The disadvantage is that the gripper lever loses its statically determined position if the most possible possible compensation of the bearing force is to be achieved. With very high machine speeds and increased pretensioning forces, insufficient centering, e.g. possible due to disturbing vibrations that are introduced into the machine. Another disadvantage is the relatively large radius of inertia and the mass of the vibrating parts for initiating the holding process.

Aus der DE-PS 1 908 181 ist ein Greifer bekannt, bei dem die Achse des Greiferfingergelenkes in einem zur Greiferwelle parallelen Drehgelenk schwenkbar gelagert ist, wobei die Achse des Greiferfingergelenkes annähernd auf der von der Greiferspitze wegweisenden Verlängerung einer Geraden gelegen ist, welche die Abstützfläche für die Greiferspitze mit der Achse der Greiferwelle verbindet. Aus der in Fig. 1 gezeigten Geometrie geht hervor, daß die von der Greiferspitze auf die Greiferauflage ausgeübte Kraft weiterhin eine Komponente in Bogenlaufrichtung aufweist. Die Gefahr des Verschiebens des Bogens besteht dadurch, sowie durch eine mögliche Torsion der Greiferwelle bei hohen Vorspannkräften auch weiterhin, wenn auch eine Verbesserung gegenüber üblichen Greifern mit kreisförmiger Bewegung um die Greiferwellenachse erreichbar ist.From DE-PS 1 908 181 a gripper is known in which the axis of the gripper finger joint is pivotally mounted in a swivel joint parallel to the gripper shaft, the axis of the gripper finger joint being located approximately on the straight line extending away from the gripper tip, which is the supporting surface for the gripper tip connects to the axis of the gripper shaft. The geometry shown in FIG. 1 shows that the force exerted by the gripper tip on the gripper support still has a component in the direction of sheet travel. As a result, there is still a risk of the arc shifting, as well as a possible torsion of the gripper shaft under high pretensioning forces, although an improvement over conventional grippers with a circular movement about the gripper shaft axis can be achieved.

Ein senkrecht schließender Greifer mit einer gesteuerten Greiferwelle ist aus der DE-PS 2 030 040 bekannt. Von Nachteil ist die kraftschlüssige Steuerung der Greiferwelle relativ zum Drehpunkt eines Steuerhebels mittels einer Führung auf der Steuerkurve. Der zusätzliche Steuerungsaufwand führt zu einer Erhöhung der Massenkräfte des mit großem Trägheitsradius schwingenden Systems und damit zu einer Verminderung des Leistungsvermögens der Druckmaschine. Außerdem ist bei größeren Verschmutzungen der Steuerkurve keine exakte Führung der zweiten, senkrechten Bewegungsphase mehr möglich.A vertically closing gripper with a controlled gripper shaft is known from DE-PS 2 030 040. A disadvantage is the frictional control of the gripper shaft relative to the fulcrum of a control lever by means of a guide on the control cam. The additional control effort leads to an increase in the inertial forces of the system vibrating with a large radius of inertia and thus to a reduction in the performance of the printing press. In addition, if the control cam is heavily soiled, it is no longer possible to guide the second, vertical movement phase exactly.

Ferner ist aus der DE-OS 3 130 689 bekannt, in Verbindung mit einer weichen Greiferauflage einen eine flache Greiferflugbahn ausführenden und in der letzten Bewegungsphase senkrecht schließenden Greiferfinger mit einer in dem Greiferfinger angeordneten und gegen den Bogengreiferaufschlag wirkenden federnden Anschlagschraube zu versehen. Eine weitere Stellschraube ist erforderlich, um federnd miteinander gekoppelte Halter einzustellen, mittels denen der Greiferfinger der Greiferwelle einer weichen Greiferauflage zugeordnet werden muß und anzwei Stellschrauben umständliche Einstellungen erforderlich sind, um eine lagegenaue Übergabe zu erreichen. Bei höheren Maschinengeschwindigkeiten wird der Schließvorgang unsauber eingeleitet.Furthermore, it is known from DE-OS 3 130 689, in conjunction with a soft gripper pad, to provide a gripper finger that executes a flat gripper trajectory and closes vertically in the last phase of movement with a resilient stop screw arranged in the gripper finger and acting against the bow gripper impact. A further set screw is required in order to adjust resiliently coupled holders, by means of which the gripper finger of the gripper shaft must be assigned to a soft gripper support and two set screws are necessary to make laborious adjustments in order to achieve an accurate transfer. The closing process is initiated improperly at higher machine speeds.

Der Erfindung liegt die Aufgabe zugrunde, dem Greiferfinger bei einem Greifer genannter Art ohne Gefahr des Ausbeulens in der zweiten Bewegungsphase eine formschlüssige Bewegung senkrecht zur Greiferauflage mittels einer Geradführung zu erteilen.The invention has for its object to give the gripper finger in a gripper of the type mentioned without risk of bulging in the second movement phase a positive movement perpendicular to the gripper pad by means of a straight guide.

Die Aufgabe wird durch die kennzeichnenden Merkmale der Patentansprüche gelöst.The object is achieved by the characterizing features of the claims.

Die Vorteile der erfindungsgemäßen Lösung bestehen darin, daß sich in einem erweiterten Geschwindigkeitsbereich bei erhöhten Vorspannkräften und Überdrückungen in Bogenlaufrichtung weder störende Kräfte noch Schwingungen auswirken können. Der Halteeffekt wird durch eine exakte Geradführung des senkrechten Schließvorganges verbessert, wobei der Greiferfinger stets seine statisch bestimmte Lage behält und nicht so träge reagiert.The advantages of the solution according to the invention are that neither disturbing forces nor vibrations can have an effect in an extended speed range with increased pretensioning forces and overpressures in the direction of sheet travel. The holding effect is improved by precise straight guidance of the vertical closing process, the gripper finger always maintaining its statically determined position and not reacting so sluggishly.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand einer Zeichnung näher beschrieben.An embodiment of the invention is described below with reference to a drawing.

Es zeigen:

  • Fig. 1 eine Seitenansicht des Greifers,
  • Fig. 2 einen Schnitt A-A nach Fig. 1,
  • Fig. 3 eine Draufsicht auf den Greifer,
  • Fig. 4 den Greifer in geöffneter Stellung, schematisch,
  • Fig. 5 den Greifer nach Ablauf der ersten Bewegungsphase während der senkrechten Schließbewegung bei einer Öffnung der Greiferspitze von ca. 1 mm,
  • Fig. 6 den Greifer in geschlossener Stellung.
Show it:
  • 1 is a side view of the gripper,
  • 2 shows a section AA according to FIG. 1,
  • 3 is a plan view of the gripper,
  • 4 the gripper in the open position, schematically,
  • Fig. 5 shows the gripper after the first move phase during the vertical closing movement with an opening of the gripper tip of approx. 1 mm,
  • Fig. 6 the gripper in the closed position.

Die Figuren 1 bis 3 zeigen den Aufbau des Greifers. In einem Zylinder 1 ist eine Nut 2 eingearbeitet, in der eine Greiferwelle 3 mit ortsfester Achse gelagert ist. Auf der Greiferwelle 3 ist ein Klemmstück 4 aufgeklemmt. An einer Wand der Nut 2 ist eine Greiferauflage 5 befestigt, deren Greiferauflagefläche 6 sich auf gleicher Höhe mit der Umfangsfläche des Zylinders 1 befindet, sowie außerdem eine Leiste 7 befestigt, die eine Stellschraube 16 trägt, die als Anschlag für ein Anschlagstück 8 dient. Das Anschlagstück 8 ist lose auf der Greiferwelle 3 gelagert und wird durch das Klemmstück 4 axial sowie unter der Wirkung einer Druckfeder 15 radial durch einen im Klemmstück 4 befestigten ersten Zylinderstift 9 in seiner Bewegung begrenzt. An einem zweiten Zylinderstift 10, der ebenfalls im Klemmstück4 befestigt ist, stützt sich ein hakenförmiger Greiferfinger 11 mit seinem unteren Ende ab. Der vorgespannte hakenförmige Greiferfinger 11 ist längsbeweglich auf einem Führungsstift 12 des Anschlagstückes 8 in einer Kugelbuchse 13 in einer zweiten Bewegungsphase senkrecht schließend und über eine Druckfeder 14 abgefedert gelagert. Der hakenförmige Greiferfinger 11 ist außerdem gegen Verdrehung im Klemmstück 4 parallel geführt und mittels der Stellschraube 16 parallel zur Greiferauflage 5 mit der Grundeinstellung versehbar. Bei Anschlag des Anschlagstückes 8 an der Stellschraube 16 kommt zunächst der erste Zylinderstift 9 frei, so daß der hakenförmige Greiferfinger 11 im Anschluß an die drehende Bewegungsphase in der zweiten Bewegungsphase spielfrei senkrecht längsbeweglich zur Greiferauflage 5 geführt ist. Der zweite Zylinderstift 10 kommt am Ende der senkrechten Bewegungsphase frei, sobald der hakenförmige Greiferfinger 11 auf dem zu greifenden Papier auf der Greiferauflage 5 aufliegt.Figures 1 to 3 show the structure of the gripper. A groove 2 is incorporated in a cylinder 1, in which a gripper shaft 3 with a fixed axis is mounted. A clamping piece 4 is clamped on the gripper shaft 3. On a wall of the groove 2, a gripper pad 5 is attached, the gripper support surface 6 is at the same level with the peripheral surface of the cylinder 1, and also a bar 7 is attached, which carries a set screw 16, which serves as a stop for a stop piece 8. The stop piece 8 is loosely mounted on the gripper shaft 3 and is limited in its movement by the clamping piece 4 axially and under the action of a compression spring 15 radially by a first cylindrical pin 9 fastened in the clamping piece 4. A hook-shaped gripper finger 11 is supported with its lower end on a second cylindrical pin 10, which is also fastened in the clamping piece 4. The pretensioned hook-shaped gripper finger 11 is movable in a longitudinally movable manner on a guide pin 12 of the stop piece 8 in a ball bushing 13 in a second movement phase, and is supported in a spring-loaded manner by a compression spring 14. The hook-shaped gripper finger 11 is also guided in parallel against rotation in the clamping piece 4 and can be provided with the basic setting parallel to the gripper support 5 by means of the adjusting screw 16. When the stop piece 8 stops on the adjusting screw 16, the first cylindrical pin 9 is first released, so that the hook-shaped gripper finger 11 is guided to the gripper pad 5 in the second movement phase, free of play, in a longitudinally movable manner following the rotating movement phase. The second cylinder pin 10 is released at the end of the vertical movement phase as soon as the hook-shaped gripper finger 11 rests on the paper to be gripped on the gripper support 5.

In den Figuren 4 bis 6 ist der Greifer in drei verschiedenen Stellungen schematisch gezeigt. Aus der geöffneten Stellung (Fig. 4) schlägt das Anschlagstück 8 beim Drehen der Greiferwelle 3 zunächst an die Stellschraube 16 in der Leiste 7 an, dabei ist die Greiferspitze noch ca. 1 mm geöffnet. Gemäss Fig. 5 und 6 erfolgt in einer zweiten Bewegungsphase eine Längsbewegung spielfrei senkrecht zur Greiferauflage 5 des hakenförmigen Greifers 11 auf dem Führungsstift 12 des Anschlagstückes 8, wobei dann die Zylinderstifte 9 und 10 wie beschrieben freikommen, bis zur vollständigen Schließung des Greifers. Dadurch wird eine lagegenaue Übergabe zwischen dem Zylinder 1 und einem zweiteren Zylinder oder einer Trommel erreicht, wobei der hakenförmige Greiferfinger 11 in der letzten Bewegungsphase mit hoher Stabilität und Genauigkeit senkrecht geführt ist. Auf diese Weise können sich weder Kräfte noch Schwingungen in Bogenlaufrichtung auswirken, so daß ein schiebefreier Schließvorgang bei verbessertem Halteeffekt gewährleistet ist. Toleranzen und die sonst vorhandene Torsion der Greiferwelle 3 wirken sich nicht mehr schädlich auf die Schließkräfte aus. Der Greifer steht nicht zu weit aus dem Umkreis seines Zylinders 1 hervor und der Kanal kann schmal ausgebildet werden. Außerdem ist das freie Umfahren der Bogenvorderkante mit einem möglichst kleinen Schwenkwinkel gewährleistet, weil die Greiferwelle 3 möglichst senkrecht unterhalb der Greiferauflage 5 gelagert werden kann. Der Greiferfinger 11 kann wie in Fig. 1 angedeutet mittels einer Abstützrolle 17, die durch exzentrische Lagerung in bekannter Weise einstellbar ist, zusätzlich seitlich an der Greiferauflage 5 gestützt sein, um die statisch bestimmte Lage des Greiferfingers 11 auch bei höchsten Biegebeanspruchungen zu erhalten.The gripper is shown schematically in three different positions in FIGS. From the open position (FIG. 4), the stop piece 8 first strikes the adjusting screw 16 in the strip 7 when the gripper shaft 3 is rotated, the gripper tip being still open about 1 mm. 5 and 6, in a second movement phase, there is a longitudinal movement without play perpendicular to the gripper support 5 of the hook-shaped gripper 11 on the guide pin 12 of the stop piece 8, the cylinder pins 9 and 10 then being released as described until the gripper is completely closed. As a result, a positionally accurate transfer between the cylinder 1 and a second cylinder or a drum is achieved, the hook-shaped gripper finger 11 being guided vertically in the last movement phase with high stability and accuracy. In this way, neither forces nor vibrations can have an effect in the direction of sheet travel, so that a sliding-free closing process with an improved holding effect is ensured. Tolerances and the otherwise existing torsion of the gripper shaft 3 no longer have a detrimental effect on the closing forces. The gripper does not protrude too far from the periphery of its cylinder 1 and the channel can be made narrow. In addition, free movement around the leading edge of the sheet is ensured with the smallest possible swivel angle because the gripper shaft 3 can be stored as vertically as possible below the gripper support 5. As indicated in FIG. 1, the gripper finger 11 can additionally be supported laterally on the gripper support 5 by means of a support roller 17, which can be adjusted by eccentric mounting in a known manner, in order to maintain the statically determined position of the gripper finger 11 even under the greatest bending stresses.

Claims (2)

1. Spring mounted gripper for sheet fed rotary printing presses with a clamping piece (4) fixed to the gripper shaft (3) which is coupled via a first spring (14) with a swingable gripper finger (11) and via a second spring (15) with a stop piece 8 mounted loosely around the gripper shaft (3), which is supported by means of a set screw (16), which is fixed to a cylinder (1), a drum, or the like, wherein the gripper finger (11) has a first turning movement phase, as well as a second moving phase perpendicular to the gripper support (5) characterised in that the stop piece (8) is supported on a first cylindrical post (9) fixed in the clamping piece (4), that a hook shaped gripper finger (11) with its lower end, is supported on a second cylindrical post (10) fixed in the clamping piece (4) and that the hook shaped gripper finger (11) is adjusted longitudinally movable play free on a guide post (12) in a pretensioned ball bush (13) by the set screw (16) cooperating with the stop piece (8) parallel to the grippers (5) somewhat larger than the maximum paper thickness to be worked with, wherein, on striking of the stop piece (8) on the set screw (16), the first cylindrical post (9) comes free so that the hook shaped gripper finger (11) is guided play free in the second phase of movement perpendicularly moving longitudinally relative to the gripper support (5) and wherein the second cylindrical post (10) comes free as soon as the hook shaped gripper finger (11) lies on the paper on the gripper support (5).
2. Spring mounted gripper according to Claim 1, characterised in that the hook shaped gripper finger (11) is guided additionally by means of an adjustable support roll (17) laterally on the gripper support (5).
EP86110491A 1985-08-19 1986-07-30 Spring-mounted gripper for sheet-fed rotary printing machines Expired EP0213397B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86110491T ATE44908T1 (en) 1985-08-19 1986-07-30 RESILIENT GRIPPER FOR SHEET ROTARY PRINTING MACHINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853529639 DE3529639A1 (en) 1985-08-19 1985-08-19 SPRING GRIPPER FOR ARC ROTATION PRINTING MACHINES
DE3529639 1985-08-19

Publications (3)

Publication Number Publication Date
EP0213397A2 EP0213397A2 (en) 1987-03-11
EP0213397A3 EP0213397A3 (en) 1987-11-04
EP0213397B1 true EP0213397B1 (en) 1989-07-26

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Application Number Title Priority Date Filing Date
EP86110491A Expired EP0213397B1 (en) 1985-08-19 1986-07-30 Spring-mounted gripper for sheet-fed rotary printing machines

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US (1) US4718342A (en)
EP (1) EP0213397B1 (en)
JP (1) JPS6251452A (en)
AT (1) ATE44908T1 (en)
DE (1) DE3529639A1 (en)

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Also Published As

Publication number Publication date
DE3529639A1 (en) 1987-02-26
US4718342A (en) 1988-01-12
ATE44908T1 (en) 1989-08-15
JPS6251452A (en) 1987-03-06
EP0213397A2 (en) 1987-03-11
DE3529639C2 (en) 1988-08-04
EP0213397A3 (en) 1987-11-04

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