EP0288700B1 - Device for advancing and orientating sheets in sheet-processing machines - Google Patents

Device for advancing and orientating sheets in sheet-processing machines Download PDF

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Publication number
EP0288700B1
EP0288700B1 EP88103791A EP88103791A EP0288700B1 EP 0288700 B1 EP0288700 B1 EP 0288700B1 EP 88103791 A EP88103791 A EP 88103791A EP 88103791 A EP88103791 A EP 88103791A EP 0288700 B1 EP0288700 B1 EP 0288700B1
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EP
European Patent Office
Prior art keywords
ball
sheet
friction
force transmission
frictional
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88103791A
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German (de)
French (fr)
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EP0288700A1 (en
Inventor
Bertold Dr. Grützmacher
Peter Theobald Blaser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication of EP0288700A1 publication Critical patent/EP0288700A1/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
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/16—Inclined tape, roller, or like article-forwarding side registers
    • B65H9/166—Roller
    • 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
    • B41F21/12—Adjusting leading edges, e.g. front stops
    • 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
    • B41F21/14—Adjusting lateral edges, e.g. side stops
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/10—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position
    • B65H9/103—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position acting by friction or suction on the article for pushing or pulling it into registered position, e.g. against a stop
    • B65H9/105—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position acting by friction or suction on the article for pushing or pulling it into registered position, e.g. against a stop using suction means

Definitions

  • the invention relates to a device for conveying and aligning sheets in sheet processing machines, in particular sheet printing machines, according to the preamble of the main claim.
  • a device of the type mentioned wherein a ball-bearing cage is arranged above a sheet support table at a distance from it.
  • the cage opening which is circular in cross section, has a larger diameter than the ball.
  • the cage height and the distance of the cage from the sheet support table are dimensioned such that the ball projects beyond the cage opening on both sides.
  • the object of the invention is based on the object of designing a generic device of simple construction and advantageous in terms of control technology in such a way that clearly defined conveying directions can be imposed on the arc by the ball.
  • the angle of the diagonal movement can be varied by an independently provided speed control. It is therefore even possible that the side and front marks of a table are reached simultaneously by the corresponding sheet edges. For example, the angle of the diagonal conveyance of the sheet is 45 ° at the same speed of the corresponding drives.
  • the alignment of the sheet can, however, also be done without placing the table on the table, specifically by computer control of the drives, for example by optically scanning the sheet. Since the spherical cap of the ball engages on the underside of the arch, greater forces can never act on the arch itself, which could damage it during transport.
  • the projection of the spherical cap over the surface of the table can be used to vary the frictional connection between the arch and the spherical cap.
  • both friction wheels must be selected to be the same size.
  • the friction wheel drives can be inserted into the overall structure of the device in a space-saving manner.
  • the one friction force transmission point lies in the plane of the axis of rotation of the other friction wheel. It proves to be optimal It turns out that the plane through the frictional force transmission points runs through the center of the ball and parallel to the conveying plane. Slip between the ball and friction wheels is largely counteracted. The corresponding movements of the frictional force transmission points are therefore transmitted precisely to the arch via the ball.
  • An increase in the friction between the spherical cap and the underside of the arch is increased by the suction gap provided between the ball and the feed table through-hole, which in turn is connected to the vacuum source.
  • the friction between the bow and the spherical cap can be varied by appropriately dimensioning the negative pressure.
  • one or more balls can be assigned to the table, the speeds of the friction wheel drives being controlled in such a way that the sheet is gently transported to the alignment position in a predetermined way.
  • Another possibility, or one that can be used in combination with it, of varying the friction between the spherical cap and the bow is to provide the ball surface with suction holes and to connect the inside of the ball to the vacuum source.
  • the ball itself can be formed from a wide variety of materials, preferably sintered metal, through which the ball receives a porous wall. A protrusion of approx.1.5mm from the calotte over the surface of the disk is sufficient to carry the bow along.
  • a particularly technically favorable solution to connect the annular gap and also the inside of the ball with the vacuum source can be seen in the fact that the ball, including its storage, is housed in the vacuum chamber. These or several if necessary are then integrated into the table. In order to reduce the friction between the sheet and the table, the air-blowing openings arranged at a distance from the ball are used. In this way it is possible to transport the sheet like an air cushion.
  • the blown air is dimensioned so that the suction force in the area of the spherical cap is not canceled.
  • several bearing balls are sufficient, which - if necessary together with the drive wheels - add up to a three-dimensional bearing.
  • the arrangement of the bearing balls is preferably such that the ball rests on a lower bearing ball, while further bearing balls act on the upper half of the ball and thus realize all-round, play-free mounting.
  • the transport of the sheet can still be favored by the fact that the spherical surface is provided with a corresponding friction lining, which may be matched to the sheet material.
  • the arch is optimally protected, especially when it is aligned without being hit.
  • the alignment movement of the sheet or the insertion of the friction wheel drives can, for.
  • the sheets in the transport direction x successively and in scales on a table 1, z. B. a feed table of a sheet printing machine, or another sheet processing machine.
  • the feed table 1 On its front narrow edge 2, the feed table 1 is equipped with a plurality of front marks 3 projecting beyond the sheet table surface.
  • the feed table 1 has in its front region 4 on its one longitudinal edge 5 a side mark 6 which also projects beyond the feed table surface.
  • the alignment according to the invention is not dependent on the existence of such marks.
  • a device 7 for applying the sheets A, B, C, etc. is assigned to the front area 4 of the feed table 1. 1, the device 7 has two box-like vacuum chambers 8, 9 lying at the same height. The same are sat in mirror image.
  • Each vacuum chamber 8, 9 is equipped with a bottom 10, at right angles to this aligned side walls 11, 12, 13, 14 and with a cover 15 placed on the side walls, the latter being inserted into a contour-accurate recess 16 of the feed table 1 and accordingly a part represents the same.
  • One side wall 13 carries a connecting piece 17 which can be connected to a vacuum source via a line (not shown).
  • a ball 18, which can be rotated in all directions about its fixed center M, is supported by means of four bearing balls 19, 20, 21, 22 placed on the spherical surface.
  • the latter are seated in blocks 23, 24, 25, 26 attached to the base 10.
  • the bearing ball 19 rotatable in the lug 23 extends perpendicularly below the center M of the ball 18.
  • the remaining three bearing balls 20, 21, 22 are provided with the same circumferential distribution as the ball, lie on a common horizontal plane and rest on the spherical surface of the upper half of the ball with positioning of the ball 18.
  • the lugs and the bearing balls are arranged so that the ball 18 is kept free of play.
  • the ball 18 projects over the feed table 1 with a dome 27 projecting above it.
  • the protrusion is approximately 1.5 mm.
  • a passage hole 28 is provided in the vacuum chamber cover 15.
  • a suction gap 29 is formed between the through hole 28 and the spherical surface lying at the same height 3, so that the sheet A overflowing the ball 18 according to FIG. 3 passes through this suction gap 29 in increased friction to the calotte 27 of the ball 18 as a result of the negative pressure.
  • the ball 18 is driven by two friction wheel drives 30, 31 which are at right angles to one another.
  • the drive axis y of the friction wheel drive 30 runs parallel to the side mark 6, while the drive axis z of the other friction wheel drive 31 is aligned parallel to the front marks 3. Furthermore, the drive axes y and z extend at the same height of the center M of the ball and run parallel to the conveying plane of the arc.
  • Each friction wheel drive 30, 31 has a friction wheel 32, 33 which is arranged at the center of the ball and is set in rotation by a DC motor 34, 35.
  • the DC motors 34, 35 in turn are seated in bearing blocks 36, 37 starting from the vacuum chamber floor 10.
  • the diameters of the friction wheels 32, 33 are of the same size.
  • the friction wheels 32, 33 are provided on their circumference with a friction lining in order to enable the ball 18 to be taken along without slipping.
  • the feed table 1 can, for. B. a scanning device 38 illustrated in dash-dotted lines in FIG. 1.
  • the same can be designed, for example, as a light barrier and serves to switch on the friction wheel drives, the latter of which can be speed-controlled independently of one another via a computer (not shown).
  • the running arc A is e.g. in its position illustrated in full lines in FIG. 1 on the leading edge 39 of the sheet is detected by the scanning device.
  • the friction wheel drives 30, 31 are switched directly or via a computer. 2, if the friction wheels 32, 33 rotate at the same speed, the plane of rotation of the ball 18 extends at an angle of 45 ° to the sheet transport direction x.
  • the bow A is accordingly moved in the diagonal direction into the dash-dotted contact position A ⁇ . This is how the bow is aligned.
  • the friction wheel drives are stopped, for example, by the computer or by means of a touch switch (not shown), so that the next sheet B can be conveyed into the alignment position after the corresponding run-in.
  • the ball 18 can be provided with a corresponding friction lining in order to improve the conveying behavior.
  • this can also be varied by the projection of the spherical cap over the surface of the feed table 1.
  • a variation by the size of the suction gap 29 and / or the measurement of the negative pressure is possible.
  • the same components have the same reference numbers.
  • the ball 40 has suction holes 41 arranged in the same distribution in its ball surface.
  • the vacuum chamber comprising the ball 40
  • the ball interior 42 is also connected to the vacuum source.
  • the suction air can accordingly become effective on the one hand through the suction gap 29 on the underside of the sheet A and on the other hand through the suction holes 41 in the region of the cap 27.
  • the third embodiment illustrated in cross section in FIG. 5 includes a ball 18 with suction gap 29 in the lid 15 which has not been changed from the first embodiment.
  • the table 1 has air-blowing openings 43 arranged at a distance from the ball. The air blown in as a result ensures a reduced friction between the underside of the sheet A and the surface of the feed table 1. However, the air that has entered through the air blowing openings 43 cannot bring the sheet A out of its static friction to the spherical cap 27.
  • the fourth embodiment finally illustrated in Figure 6 largely corresponds to the first embodiment shown in Figures 2 and 3.
  • the same components have the same reference numbers.
  • the DC motor 34 is coaxial with the DC motor 35 arranged.
  • the bearing block 36 which has also been converted, is used to hold the DC motor 34.
  • An intermediate wheel 45 is fixed on the drive shaft 44 of the DC motor 34, which in turn rotates a friction wheel 46 stored in the vacuum chamber 8. The latter touches the ball 18.
  • a broad-side ring zone 47 serves as the drive surface of the friction wheel 46, which is formed by a central recess 48 extending from the broad wheel side.
  • the friction force transmission points S1 and S2 also form an angle of 90 ° in this embodiment. Furthermore, such an arrangement is made that these friction force transmission points S1 and S2 lie in a plane which runs through the center of the ball and is parallel to the conveying plane. Furthermore, this embodiment differs from the first in that the bracket 26 with the associated bearing ball 22 is dispensed with. The remaining three bearing balls 19, 20, 21, which lie opposite the frictional force transmission points S1 and S2, serve to support and support the ball 18. The latter cause the ball 18 to be pressed in the direction of its support points formed by the bearing balls 19, 20, 21, with the result that the ball 18 is supported without play.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Registering Or Overturning Sheets (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Fördern und Ausrichten von Bogen bei bogenverarbeitenden Maschinen, insbesondere Bogendruckmaschinen, gemäß Gattungsbegriff des Hauptanspruches.The invention relates to a device for conveying and aligning sheets in sheet processing machines, in particular sheet printing machines, according to the preamble of the main claim.

Aus der US-PS 4 411 418 ist eine Vorrichtung der eingangs genannten Art bekannt, wobei oberhalb eines Bogenauflage-Tisches mit Abstand zu diesem ein eine Kugel aufnehmender Käfig angeordnet ist. Die im Querschnitt kreisförmige Käfigöffnung besitzt einen größeren Durchmesser als die Kugel. Die Käfighöhe und der Abstand des Käfigs von dem Bogenauflage-Tisch sind so bemessen, daß die Kugel beidseitig die Käfigöffnung überragt. Mit ihrer unteren, über den korrespondierenden Käfigrand vorstehenden Kalotte liegt die Kugel auf einem zu verschiebenden Bogen auf, während an der den oberen Käfigrand überragenden Kalotte reibschlüssig ein Riemenantrieb angreift. Durch diesen wird die Kugel in Umdrehung versetzt, die den Bogen in den Eckbereich zweier rechtwinklig zueinanderstehender Anschlagschienen transportiert. Das bedeutet, daß auch der Riemenantrieb schräg in die Ecke dieser beiden Anschlagschienen hineinläuft. Dadurch vermittelt die von dem Riemen angetriebene Kugel dem Bogen im wesentlichen nur eine einzige definierte Förderrichtung. Sobald der Bogen gegen eine der beiden Förderkanten stößt, wird durch diese die weitere Förderrichtung bestimmt. Diese vorbeschriebene Ausführungsform hat es sich dabei zur Aufgabe gestellt, in der Bogen-Anschlagstellung durch die angetriebene Kugel keine größeren Schubkräfte auf den Bogen auszuüben, so daß ein Beschädigen desselben nicht auftreten kann. Dies ist möglich wegen des größeren Lagerspiels und wegen eines aus Reibmaterial bestehenden Sektors des Käfigs. Sobald nämlich nach Anschlag des Bogens die Kugel in Anlage zu diesem Reibsektor gelangt, hat sie das Bestreben, an der Innenwandung desselben in Aufwärtsrichtung zu rollen verbunden mit einer Druckentlastung.From US-PS 4 411 418 a device of the type mentioned is known, wherein a ball-bearing cage is arranged above a sheet support table at a distance from it. The cage opening, which is circular in cross section, has a larger diameter than the ball. The cage height and the distance of the cage from the sheet support table are dimensioned such that the ball projects beyond the cage opening on both sides. With its lower calotte, which projects above the corresponding cage edge, the ball rests on an arc to be displaced, while a belt drive engages frictionally on the calotte projecting beyond the upper cage edge. This rotates the ball, which transports the sheet into the corner area of two stop rails that are at right angles to each other. This means that the belt drive runs diagonally into the corner of these two stop rails. As a result, the ball driven by the belt essentially only conveys a single defined conveying direction to the sheet. As soon as the sheet hits one of the two conveyor edges, this determines the further direction of funding. This embodiment described above has set itself the task of not exerting any greater thrust forces on the bow in the bow stop position by the driven ball, so that damage to the bow cannot occur. This is possible because of the larger bearing play and because of a sector of the cage made of friction material. As soon as the ball comes into contact with this friction sector after the arc has stopped, it tends to roll upwards on the inner wall thereof, with pressure relief.

Dem Gegenstand der Erfindung liegt demgegenüber die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung von einfachem und steuerungstechnisch vorteilhaftem Aufbau so auszugestalten, daß dem Bogen von der Kugel eindeutig definierte Förderrichtungen aufgezwungen werden können.In contrast, the object of the invention is based on the object of designing a generic device of simple construction and advantageous in terms of control technology in such a way that clearly defined conveying directions can be imposed on the arc by the ball.

Diese Aufgabe wird durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.This object is achieved by the features of the characterizing part of claim 1.

Die Unteransprüche betreffen vorteilhafte Weiterbildungen des Gegenstands des Anspruchs 1.The subclaims relate to advantageous developments of the subject matter of claim 1.

Zufolge derartiger Ausgestaltung ist eine gattungsgemäße Vorrichtung angegeben, die sich durch einen erhöhten Gebrauchswert auszeichnet. Nach Übergabe des Bogens an die Kugel bringt ausschließlich diese den Bogen in die definierte Ausrichtstellung bzw. Anlegestellung, die beispielsweise wichtig ist bei einem Mehrfachdurchlauf des Bogens durch eine Druckmaschine. Zusätzliche, ein Ausrichten des Bogens erzwingende Anlageschienen, wie sie beim eingangs genannten Stand der Technik erforderlich sind, können dabei entfallen. Diese genaue Ausrichtsposition des Bogens kann ferner erforderlich sein bei einem Kantenabschneiden bzw. Trennen von Bogen. Mittels der über den Tisch vorstehenden Kalotte der unter dem Tisch um ihren ortsfesten Mittelpunkt in allen Richtungen drehbar gelagerten Kugel kann der Bogen in jeder beliebigen Richtung in seiner Ebene verschoben werden. Voraussetzung dafür ist die Maßnahme zweier um mindestens 90° zueinanderstehender Reib-Kraftübertragungsstellen an der Kugel. Für das Mitnehmen des Bogens ist es dabei notwendig, daß die Reibung zwischen der Kalotte und dem Bogen größer ist als diejenige zwischen dem Tisch und der Unterseite des Bogens. Kommen zwei Reib-Kraftübertragungsstellen zum Einsatz, so sind sie in einer Ebene rechtwinklig zueinander anzuordnen. Dann ist die Verlagerung des Bogens in beliebiger Richtung in der Verschiebeebene durchführbar. Diese 90°-Stellung der Reib-Kraftübertragungsstellen läßt eine preisgünstige Ausführung eines solchen Mehrrichtungsantriebes zu. Es wäre jedoch beispielsweise auch möglich, drei Reib-Kraftübertragungsstellen in 120°-Winkellage vorzusehen mit ihnen zugeordneten drei programmgesteuerten Antriebsmotoren. Bei Einsatz zweier, um 90° zueinander versetzter Reib-Kraftübertragungsstellen führt ein gleichzeitiger Antrieb die Kugel in eine solche Rotation, die eine Diagonalverlagerung des Bogens in Bezug auf seine Zulaufrichtung erzwingt. Der Winkel der Diagonalbewegung kann dabei variiert werden durch eine unabhängig voneinander vorgesehene Drehzahlsteuerung. Es ist daher sogar möglich, daß die Seiten- und Vordermarken eines Tisches gleichzeitig von den entsprechenden Bogenkanten erreicht werden. Beispielsweise beträgt der Winkel der Diagonalförderung des Bogens bei gleicher Drehzahl der entsprechenden Antriebe 45°. Das Ausrichten des Bogens kann jedoch auch ohne Anlegemarken des Tisches erfolgen, und zwar durch Rechnersteuerung der Antriebe aufgrund z.B. optischer Abtastung des Bogens. Da die Kalotte der Kugel an der Bogenunterseite angreift, können am Bogen selbst niemals größere Kräfte wirksam werden, die zu einem Beschädigen desselben während des Transportes führen könnten. Dabei kann der Überstand der Kalotte über die Auflagefläche des Tisches mit zur Varaition des Reibschlusses zwischen Bogen und Kalotte herangezogen werden. Es bietet sich ferner an, die Reib-Kraftübertragungsstellen als Reibradantriebe zu gestalten. Um gleiche Antriebsbedingungen zu erhalten, sind beide Reibräder gleichgroß zu wählen. Im übrigen lassen sich die Reibradantriebe raumsparend in den Gesamtaufbau der Vorrichtung einfügen. Zwecks Vermeidung einer Relativbewegung zwischen der Reibfläche des Reibrades und der Kugeloberfläche liegt jeweils die eine Reib-Kraftübertragungsstelle in der Ebene der Drehachse des anderen Reibrades. Als optimal erweist es sich dabei, daß die durch die Reib-Kraftübertragungsstellen gelegte Ebene durch den Kugelmittelpunkt und parallel zur Förderebene verläuft. Einem Schlupf zwischen Kugel und Reibrädern wird damit weitgehend entgegengewirkt. Die entsprechenden Bewegungen der Reib-Kraftübertragungsstellen werden daher über die Kugel genau auf den Bogen übertragen. Eine Erhöhung der Reibung zwischen Kalotte und Unterseite des Bogens wird durch den sich zwischen Kugel und Anlegetisch-Durchtrittsloch vorgesehenen Saugspalt erhöht, welcher seinerseits in Verbindung steht mit der Unterdruckquelle. Auch hier ist eine Variation der Reibung zwischen Bogen und Kalotte durch entsprechendes Dimensionieren des Unterdrucks möglich. Je nach Bedarf können dem Tisch eine oder mehrere Kugeln zugeordnet werden, wobei die Drehzahlen der Reibradantriebe so zu steuern sind, daß der Bogen schonend auf vorbestimmtem Weg in die Ausrichtstellung transportiert wird. Eine andere oder in Kombination damit einsetzbare Möglichkeit, die Reibung zwischen der Kalotte und dem Bogen zu variieren, besteht darin, die Kugeloberfläche mit Sauglöchern auszustatten und das Kugelinnere mit der Unterdruckquelle zu verbinden. Die Kugel selbst kann aus den verschiedensten Materialien geformt sein, vorzugsweise Sintermetall, durch welches die Kugel eine poröse Wand erhält. Es genügt etwa ein Überstand von ca. 1,5mm der Kalotte über die Tschfläche, um das Mitschleppen des Bogen zu bewerkstelligen. Eine besonders technisch günstige Lösung, den Ringspalt und auch das Kugelinnere mit der Unterdruckquelle zu verbinden, ist darin zu sehen, die Kugel einschließlich ihrer Lagerung in der Unterdruckkammer unterzubringen. Diese oder bei Bedarf auch mehrere werden dann in den Tisch integriert. Zwecks Verringerung der Reibung zwischen Bogen und Tisch dienen die mit Abstand zur Kugel angeordneten Luftblasöffnungen. Auf diese Weise ist es möglich, den Bogen luftkissenartig zu transportieren. Die Blasluft ist dabei so bemessen, daß die Saugkraft im Bereich der Kalotte der Kugel nicht aufgehoben wird. Zur sicheren Positionierung derselben genügen bereits mehrere Lagerkugeln, die sich - gegebenenfalls zusammen mit den Antriebsrädern - zu einer dreidimensionalen Lagerung ergänzen. Vorzugsweise ist die Anordnung der Lagerkugeln derart, daß die Kugel auf eine untere Lagerkugel aufsetzt, während weitere Lagerkugeln an der oberen Kugelhälfte angreifen und somit eine allseitige, spielfreie Lagerung verwirklichen. Den Transport des Bogens kann man noch dadurch begünstigen, daß die Kugelfläche mit einem entsprechenden, eventuell auf das Bogenmaterial abgestimmten Reibbelag versehen ist. Eine optimale Schonung erhält der Bogen insbesondere bei einem anschlagfreien Ausrichten. Die Ausrichtbewegung des Bogens bzw. das Einsetzen der Reibradantriebe kann z. B. erst dann geschehen, wenn die Bogenvorderkante eine Abtasteinrichtung passiert. Trotz 90°-Anordnung der Reib-Kraftübertragungsstellen ist es möglich, die Antriebsmotoren beider Reibradantriebe koaxial zueinander anzuordnen. Dies ist erlaubt durch den Antrieb des einen Reibrades über das Zwischenrad. Auch empfiehlt sich diese Maßnahme dann, wenn nur wenig Einbauraum zur Verfügung steht. Zur Lagensicherung der Kugeln können ferner noch die Reib-Kraftübertragungsstellen mit herangezogen werden, indem sie den Lagerkugeln gegenüberliegen, so daß eventuell in ihrem Bereich auf eine Lagerkugel verzichtet werden kann. Es sind jedoch mindestens stets drei Lagerkugeln vorzusehen, um eine definierte Stellung der Kugel zu erhalten.As a result of such a configuration, a generic device is specified which is distinguished by an increased utility value. After handing over the sheet to the The ball only brings the sheet into the defined alignment position, which is important, for example, when the sheet is passed through a printing machine several times. Additional, compelling alignment rails, as are required in the prior art mentioned above, can be omitted. This exact alignment position of the sheet may also be necessary when cutting or separating sheets. By means of the dome protruding above the table, the ball rotatably mounted in all directions around its fixed center point, the arch can be shifted in any direction in its plane. The prerequisite for this is the measure of two friction force transmission points on the ball that are at least 90 ° apart. To take the sheet with you, it is necessary that the friction between the calotte and the sheet is greater than that between the table and the underside of the sheet. If two friction force transmission points are used, they must be arranged at right angles to one another in one plane. Then the arch can be moved in any direction in the displacement plane. This 90 ° position of the friction force transmission points allows an inexpensive design of such a multi-directional drive. However, it would also be possible, for example, to provide three friction force transmission points in a 120 ° angular position with three program-controlled drive motors assigned to them. When using two friction power transmission points offset by 90 ° to each other a simultaneous drive causes the ball to rotate in such a way that it forces the bow to move diagonally with respect to its feed direction. The angle of the diagonal movement can be varied by an independently provided speed control. It is therefore even possible that the side and front marks of a table are reached simultaneously by the corresponding sheet edges. For example, the angle of the diagonal conveyance of the sheet is 45 ° at the same speed of the corresponding drives. The alignment of the sheet can, however, also be done without placing the table on the table, specifically by computer control of the drives, for example by optically scanning the sheet. Since the spherical cap of the ball engages on the underside of the arch, greater forces can never act on the arch itself, which could damage it during transport. The projection of the spherical cap over the surface of the table can be used to vary the frictional connection between the arch and the spherical cap. It also makes sense to design the friction force transmission points as friction wheel drives. In order to obtain the same drive conditions, both friction wheels must be selected to be the same size. In addition, the friction wheel drives can be inserted into the overall structure of the device in a space-saving manner. In order to avoid a relative movement between the friction surface of the friction wheel and the ball surface, the one friction force transmission point lies in the plane of the axis of rotation of the other friction wheel. It proves to be optimal It turns out that the plane through the frictional force transmission points runs through the center of the ball and parallel to the conveying plane. Slip between the ball and friction wheels is largely counteracted. The corresponding movements of the frictional force transmission points are therefore transmitted precisely to the arch via the ball. An increase in the friction between the spherical cap and the underside of the arch is increased by the suction gap provided between the ball and the feed table through-hole, which in turn is connected to the vacuum source. Here too, the friction between the bow and the spherical cap can be varied by appropriately dimensioning the negative pressure. Depending on requirements, one or more balls can be assigned to the table, the speeds of the friction wheel drives being controlled in such a way that the sheet is gently transported to the alignment position in a predetermined way. Another possibility, or one that can be used in combination with it, of varying the friction between the spherical cap and the bow, is to provide the ball surface with suction holes and to connect the inside of the ball to the vacuum source. The ball itself can be formed from a wide variety of materials, preferably sintered metal, through which the ball receives a porous wall. A protrusion of approx.1.5mm from the calotte over the surface of the disk is sufficient to carry the bow along. A particularly technically favorable solution to connect the annular gap and also the inside of the ball with the vacuum source, can be seen in the fact that the ball, including its storage, is housed in the vacuum chamber. These or several if necessary are then integrated into the table. In order to reduce the friction between the sheet and the table, the air-blowing openings arranged at a distance from the ball are used. In this way it is possible to transport the sheet like an air cushion. The blown air is dimensioned so that the suction force in the area of the spherical cap is not canceled. For the safe positioning of these, several bearing balls are sufficient, which - if necessary together with the drive wheels - add up to a three-dimensional bearing. The arrangement of the bearing balls is preferably such that the ball rests on a lower bearing ball, while further bearing balls act on the upper half of the ball and thus realize all-round, play-free mounting. The transport of the sheet can still be favored by the fact that the spherical surface is provided with a corresponding friction lining, which may be matched to the sheet material. The arch is optimally protected, especially when it is aligned without being hit. The alignment movement of the sheet or the insertion of the friction wheel drives can, for. B. only happen when the sheet leading edge passes a scanner. Despite the 90 ° arrangement of the friction force transmission points, it is possible to arrange the drive motors of both friction wheel drives coaxially with one another. This is permitted by driving one friction wheel via the intermediate wheel. This is also recommended Measure if there is little installation space available. To secure the balls in position, the frictional force transmission points can also be used by lying opposite the bearing balls, so that a bearing ball can possibly be dispensed with in their area. However, at least three bearing balls must always be provided in order to maintain a defined position of the ball.

Nachstehend werden vier Ausführungsbeispiele der Erfindung anhand der Fig. 1 bis 6 erläutert. Es zeigt

Fig. 1
eine Draufsicht auf einen mit der erfindungsgemäßen Vorrichtung ausgestatteten Tisch bei aufgelaufenen Bogen,
Fig. 2
eine Draufsicht auf eine Unterdruckkammer der Vorrichtung bei fortgelassenem, in den Tisch zu integrierendem Deckel, betreffend die erste Ausführungsform,
Fig. 3
den Schnitt nach der Linie III-III in Fig. 2,
Fig. 4
in schematischer Darstellung einen Vertikalschnitt durch die Unterdruckkammer mit in dieser angeordneter Kugel, deren Kugeloberfläche mit Sauglöchern ausgestattet ist, betreffend die zweite Ausführungsform,
Fig. 5
einen der Fig. 4 ähnlichen Schnitt, wobei der Anlegetisch mit Abstand zur Kugel angeordnete Lufteinblasöffnungen aufweist gemäß der dritten Ausführungsform, und
Fig. 6
eine der Fig. 2 ähnliche Darstellung, betreffend die vierte Ausführungsform.
Four exemplary embodiments of the invention are explained below with reference to FIGS. 1 to 6. It shows
Fig. 1
2 shows a plan view of a table equipped with the device according to the invention with the sheet opened,
Fig. 2
2 shows a plan view of a vacuum chamber of the device with the lid to be integrated into the table omitted, relating to the first embodiment,
Fig. 3
the section along the line III-III in Fig. 2,
Fig. 4
a schematic representation of a vertical section through the vacuum chamber with a ball arranged in it, the ball surface of which is equipped with suction holes, relating to the second embodiment,
Fig. 5
4 similar section, wherein the feed table has air injection openings arranged at a distance from the ball according to the third embodiment, and
Fig. 6
one of FIG. 2 similar representation, regarding the fourth embodiment.

Von einem nicht dargestellten Bogenstapel gelangen die Bogen in Transportrichtung x nacheinander und schuppenartig auf einen Tisch 1, z. B. einen Anlegetisch einer Bogendruckmaschine, oder einer anderen den Bogen verarbeitenden Maschine. An seiner vorderen Schmalkante 2 ist der Anlegetisch 1 mit mehreren über die Bogentischfläche vorstehenden Vordermarken 3 bestückt. Ferner besitzt der Anlegetisch 1 in seinem vorderen Bereich 4 an seiner einen Längskante 5 eine ebenfalls die Anlegetischfläche überragende Seitenmarke 6. Das Ausrichten gemäß der Erfindung ist jedoch nicht von der Existenz solcher Marken abhängig.From a stack of sheets, not shown, the sheets in the transport direction x successively and in scales on a table 1, z. B. a feed table of a sheet printing machine, or another sheet processing machine. On its front narrow edge 2, the feed table 1 is equipped with a plurality of front marks 3 projecting beyond the sheet table surface. Furthermore, the feed table 1 has in its front region 4 on its one longitudinal edge 5 a side mark 6 which also projects beyond the feed table surface. However, the alignment according to the invention is not dependent on the existence of such marks.

Dem vorderen Bereich 4 des Anlegetisches 1 ist eine Vorrichtung 7 zum Anlegen der Bogen A, B, C, usw. zugeordnet. Gemäß Fig. 1 weist die Vorrichtung 7 zwei auf gleicher Höhe liegende, kastenartige Unterdruckkammern 8, 9 auf. Dieselben sind spiegelbildlich gesatltet.A device 7 for applying the sheets A, B, C, etc. is assigned to the front area 4 of the feed table 1. 1, the device 7 has two box-like vacuum chambers 8, 9 lying at the same height. The same are sat in mirror image.

Jede Unterdruckkammer 8, 9 ist mit einem Boden 10, rechtwinklig zu diesem ausgerichteten Seitenwänden 11, 12, 13, 14 sowie mit einem auf die Seitenwände aufsetzenden Deckel 15 ausgestattet, welch letzterer in eine konturengenaue Ausnehmung 16 des Anlegetisches 1 eingesetzt ist und demgemäß einen Teil desselben darstellt. Die eine Seitenwand 13 trägt einen Anschlußstutzen 17, welcher über eine nicht dargestellte Leitung mit einer Unterdruckquelle verbindbar ist.Each vacuum chamber 8, 9 is equipped with a bottom 10, at right angles to this aligned side walls 11, 12, 13, 14 and with a cover 15 placed on the side walls, the latter being inserted into a contour-accurate recess 16 of the feed table 1 and accordingly a part represents the same. One side wall 13 carries a connecting piece 17 which can be connected to a vacuum source via a line (not shown).

In jeder Unterdruckkammer 8, 9 lagert eine um ihren ortsfesten Mittelpunkt M in allen Richtungen drehbare Kugel 18 mittels vier auf die Kugelfläche aufsetzender Lagerkugeln 19, 20, 21, 22. Letztere sitzen in am Boden 10 befestigten Böckchen 23, 24, 25, 26. Die in dem Böckchen 23 drehbare Lagerkugel 19 erstreckt sich lotrecht unterhalb des Mittelpunktes M der Kugel 18. Die übrigen drei Lagerkugeln 20, 21, 22 sind in gleicher Umfangsverteilung zur Kugel vorgesehen, liegen auf einer gemeinsamen Horizontalebene und setzen auf die Kugelfläche der oberen Kugelhälfte auf unter Lagenpositionierung der Kugel 18. Die Böckchen und die Lagerkugeln sind so angeordnet, daß die Kugel 18 spielfrei gehalten ist. Die Kugel 18 überragt den Anlegetisch 1 mit einer über diesen vorstehenden Kalotte 27. Der Überstand beträgt dabei ca. 1,5mm. Damit die Kalotte 27 den Anlegetisch überragen kann, ist in dem Unterdruckkammer-Deckel 15 ein Durchtrittsloch 28 vorgesehen. Zwischen dem Durchtrittsloch 28 und der auf gleicher Höhe liegenden Kugelfläche wird ein Saugspalt 29 gebildet, so daß der gemäß Fig. 3 die Kugel 18 überlaufende Bogen A durch diesen Saugspalt 29 in vergrößerte Reibung zur Kalotte 27 der Kugel 18 infolge des Unterdrucks gelangt.In each vacuum chamber 8, 9, a ball 18, which can be rotated in all directions about its fixed center M, is supported by means of four bearing balls 19, 20, 21, 22 placed on the spherical surface. The latter are seated in blocks 23, 24, 25, 26 attached to the base 10. The bearing ball 19 rotatable in the lug 23 extends perpendicularly below the center M of the ball 18. The remaining three bearing balls 20, 21, 22 are provided with the same circumferential distribution as the ball, lie on a common horizontal plane and rest on the spherical surface of the upper half of the ball with positioning of the ball 18. The lugs and the bearing balls are arranged so that the ball 18 is kept free of play. The ball 18 projects over the feed table 1 with a dome 27 projecting above it. The protrusion is approximately 1.5 mm. So that the calotte 27 can protrude above the feed table, a passage hole 28 is provided in the vacuum chamber cover 15. A suction gap 29 is formed between the through hole 28 and the spherical surface lying at the same height 3, so that the sheet A overflowing the ball 18 according to FIG. 3 passes through this suction gap 29 in increased friction to the calotte 27 of the ball 18 as a result of the negative pressure.

Ihren Antrieb erhält die Kugel 18 durch zwei rechtwinklig zueinanderstehende Reibradantriebe 30, 31. Die Antriebsachse y des Reibradantriebes 30 verläuft parallel zur Seitenmarke 6, während die Antriebsachse z des anderen Reibradantriebes 31 parallel zu den Vordermarken 3 ausgerichtet ist. Ferner erstrecken sich die Antriebsachsen y und z auf gleicher Höhe des Mittelpunktes M der Kugel und verlaufen parallel zur Förderebene des Bogens. Jeder Reibradantrieb 30, 31 besitzt ein auf Höhe der Mitte der Kugel angeordnetes Reibrad 32, 33, die von einem Gleichstrommotor 34, 35 in Umdrehung versetzt werden. Dadurch werden zwischen Kugel 18 und den Reibrädern Reib-Kraftübertragungsstellen S1 und S2 gebildet derart, daß jeweils die eine Reib-Kraftübertragungsstelle in der Ebene der Drehachse des andeen Reibrades liegt. Die Gleichstrommotoren 34, 35 sitzen ihrerseits in vom Unterdruckkammer-Boden 10 ausgehenden Lagerböckchen 36, 37. Die Durchmesser der Reibräder 32, 33 sind gleichgroß. Ferner sind die Reibräder 32, 33 auf ihrem Umfang mit einem Reibbelag versehen, um eine schlupffreie Mitnahme der Kugel 18 zu ermöglichen.The ball 18 is driven by two friction wheel drives 30, 31 which are at right angles to one another. The drive axis y of the friction wheel drive 30 runs parallel to the side mark 6, while the drive axis z of the other friction wheel drive 31 is aligned parallel to the front marks 3. Furthermore, the drive axes y and z extend at the same height of the center M of the ball and run parallel to the conveying plane of the arc. Each friction wheel drive 30, 31 has a friction wheel 32, 33 which is arranged at the center of the ball and is set in rotation by a DC motor 34, 35. As a result, friction force transmission points S1 and S2 are formed between ball 18 and the friction wheels in such a way that one friction force transmission point lies in the plane of the axis of rotation of the other friction wheel. The DC motors 34, 35 in turn are seated in bearing blocks 36, 37 starting from the vacuum chamber floor 10. The diameters of the friction wheels 32, 33 are of the same size. Furthermore, the friction wheels 32, 33 are provided on their circumference with a friction lining in order to enable the ball 18 to be taken along without slipping.

Dem Anlegetisch 1 kann z. B. eine in Fig. 1 strichpunktiert veranschaulichte Abtasteinrichtung 38 zugeordnet sein. Dieselbe kann beispielsweise als Lichtschranke ausgebildet sein und dient dazu, die Reibradantriebe einzuschalten, welch letztere über einen nicht dargestellten Rechner unabhängig voneinander drehzahlsteuerbar sind.The feed table 1 can, for. B. a scanning device 38 illustrated in dash-dotted lines in FIG. 1. The same can be designed, for example, as a light barrier and serves to switch on the friction wheel drives, the latter of which can be speed-controlled independently of one another via a computer (not shown).

Es ergibt sich folgende Wirkungsweise: Der laufende Bogen A wird z.B. in seiner in Fig. 1 mit vollen Linien veranschaulichten Position an der Bogenvorderkante 39 von der Abtasteinrichtung erfaßt. Direkt oder über Rechner werden die Reibradantriebe 30, 31 geschaltet. Wenn beim dargestellten Ausführungsbeispiel gemäß Fig. 2 die Reibräder 32, 33 mit gleicher Drehzahl umlaufen, erstreckt sich die Rotationsebene der Kugel 18 im Winkel von 45° zur Bogen-Transportrichtung x. Der Bogen A wird demgemäß in Diagonalrichtung in die strichpunktierte Anlagestellung Aʹ bewegt. So erfährt der Bogen seine genaue Ausrichtung. Die Reibradantriebe werden beispielsweise vom Rechner oder über einen nicht dargestellten Berührungsschalter stillgesetzt, so daß der nächste Bogen B nach entsprechendem Einlauf in die Ausrichtposition befördert werden kann.This results in the following mode of action: The running arc A is e.g. in its position illustrated in full lines in FIG. 1 on the leading edge 39 of the sheet is detected by the scanning device. The friction wheel drives 30, 31 are switched directly or via a computer. 2, if the friction wheels 32, 33 rotate at the same speed, the plane of rotation of the ball 18 extends at an angle of 45 ° to the sheet transport direction x. The bow A is accordingly moved in the diagonal direction into the dash-dotted contact position Aʹ. This is how the bow is aligned. The friction wheel drives are stopped, for example, by the computer or by means of a touch switch (not shown), so that the next sheet B can be conveyed into the alignment position after the corresponding run-in.

Gemäß dem ersten Ausführungsbeispiel, dargestellt in den Fig. 1 bis 3, kann die Kugel 18 mit einem entsprechenden Reibbelag versehen sein, um das Förderverhalten zu verbessern. Variierbar ist dieses jedoch auch durch den Überstand der Kalotte über die Fläche des Anlegetisches 1. Ferner ist eine Variation durch die Größe des Saugspaltes 29 und/oder Bemessung des Unterdruckes möglich.According to the first exemplary embodiment, shown in FIGS. 1 to 3, the ball 18 can be provided with a corresponding friction lining in order to improve the conveying behavior. However, this can also be varied by the projection of the spherical cap over the surface of the feed table 1. Furthermore, a variation by the size of the suction gap 29 and / or the measurement of the negative pressure is possible.

Bei der in Fig. 4 veranschaulichten, größer dargestellten zweiten Ausführungsform tragen gleiche Bauteile gleiche Bezugsziffern. Abweichend von der vorher beschriebenen ersten Ausführungsform besitzt die Kugel 40 in ihrer Kugeloberfläche in gleicher Verteilung angeordnete Sauglöcher 41. Zufolge der die Kugel 40 umfassenden Unterdruckkammer ist auch das Kugelinnere 42 mit der Unterdruckquelle verbunden. Die Saugluft kann demgemäß einerseits durch den Saugspalt 29 an der Unterseite des Bogens A und andererseits durch die Sauglöcher 41 im Bereich der Kalotte 27 wirksam werden.In the second embodiment illustrated in FIG. 4, shown larger, the same components have the same reference numbers. In a departure from the previously described first embodiment, the ball 40 has suction holes 41 arranged in the same distribution in its ball surface. As a result of the vacuum chamber comprising the ball 40, the ball interior 42 is also connected to the vacuum source. The suction air can accordingly become effective on the one hand through the suction gap 29 on the underside of the sheet A and on the other hand through the suction holes 41 in the region of the cap 27.

Die in Fig. 5 im Querschnitt veranschaulichte dritte Ausführungsform beinhaltet eine gegenüber der ersten Ausführungsform unveränderte Kugel 18 mit Saugspalt 29 in dem Deckel 15. Abweichend von der ersten Ausführungsform weist der Tisch 1 mit Abstand zur Kugel angeordnete Luftblasöffnungen 43 auf. Die hierdurch eingeblasene Luft sorgt für eine verringerte Reibung zwischen der Unterseite des Bogens A und der Oberfläche des Anlegetisches 1. Die durch die Luftblasöffnungen 43 eingetretene Luft vermag jedoch nicht den Bogen A aus seiner Haftreibung zur Kalotte 27 der Kugel zu bringen.The third embodiment illustrated in cross section in FIG. 5 includes a ball 18 with suction gap 29 in the lid 15 which has not been changed from the first embodiment. In contrast to the first embodiment, the table 1 has air-blowing openings 43 arranged at a distance from the ball. The air blown in as a result ensures a reduced friction between the underside of the sheet A and the surface of the feed table 1. However, the air that has entered through the air blowing openings 43 cannot bring the sheet A out of its static friction to the spherical cap 27.

Die schließlich noch in Fig. 6 veranschaulichte vierte Ausführungsform entspricht weitgehend der in den Fig. 2 und 3 gezeigtenersten Ausführungsform. Gleiche Bauteile tragen gleiche Bezugsziffern. Abweichend von der ersten Ausführungsform ist der Gleichstrommotor 34 koaxial zum Gleichstrommotor 35 angeordnet. Zur Halterung des Gleichstrommotors 34 dient das ebenfalls umgesetzte Lagerböckchen 36. Auf der Antriebswelle 44 des Gleichstrommotors 34 ist ein Zwischenrad 45 festgelegt, welches seinerseits ein in der Unterdruckkammer 8 gelagertes Reibrad 46 in Umdrehung versetzt. Letzteres tangiert die Kugel 18. Als Antriebsfläche des Reibrades 46 dient eine breitseitige Ringzone 47, die von einer zentrischen, von der Reibradbreitseite ausgehenden Vertiefung 48 gebildet wird.The fourth embodiment finally illustrated in Figure 6 largely corresponds to the first embodiment shown in Figures 2 and 3. The same components have the same reference numbers. Unlike the first embodiment, the DC motor 34 is coaxial with the DC motor 35 arranged. The bearing block 36, which has also been converted, is used to hold the DC motor 34. An intermediate wheel 45 is fixed on the drive shaft 44 of the DC motor 34, which in turn rotates a friction wheel 46 stored in the vacuum chamber 8. The latter touches the ball 18. A broad-side ring zone 47 serves as the drive surface of the friction wheel 46, which is formed by a central recess 48 extending from the broad wheel side.

Die Reib-Kraftübertragungsstellen S1 und S2 schließen auch bei dieser Ausgestaltung einen Winkel von 90° ein. Ferner ist eine solche Anordnung getroffen, daß diese Reib-Kraftübertragungsstellen S1 und S2 in einer Ebene liegen, die durch den Kugelmittelpunkt verläuft und parallel zur Förderebene liegt. Ferner unterscheidet sich diese Ausgestaltung von der ersten darin, daß auf das Böckchen 26 mit zugehöriger Lagerkugel 22 verzichtet ist. Zur Abstützung und Lagerung der Kugel 18 dienen die verbleibenden drei Lagerkugeln 19, 20, 21 welche die Reib-Kraftübertragungsstellen S1 und S2 gegenüberliegen. Letztere bewirken das Andrücken der Kugel 18 in Richtung ihrer von den Lagerkugeln 19, 20, 21 gebildeten Abstützpunkte unter Erzielung einer spielfreien Lagerung der Kugel 18.The friction force transmission points S1 and S2 also form an angle of 90 ° in this embodiment. Furthermore, such an arrangement is made that these friction force transmission points S1 and S2 lie in a plane which runs through the center of the ball and is parallel to the conveying plane. Furthermore, this embodiment differs from the first in that the bracket 26 with the associated bearing ball 22 is dispensed with. The remaining three bearing balls 19, 20, 21, which lie opposite the frictional force transmission points S1 and S2, serve to support and support the ball 18. The latter cause the ball 18 to be pressed in the direction of its support points formed by the bearing balls 19, 20, 21, with the result that the ball 18 is supported without play.

Claims (15)

  1. Device for conveying and aligning sheets in a sheet-processing machine, in particular in a printing machine, comprising at least one frictionally driven ball, a dome of said ball facing towards a sheet, acting on a broad surface of said sheet and moving said sheet in its plane, at least two frictional-force transmission locations, arranged at least at 90° to each other, being assigned to the ball which is mounted so as to be rotatable about its centre (M) in all directions,
    characterized in
    that the centre (M) of the ball is stationarily mounted, and that the dome (27) acts on the underside of the sheet.
  2. Device according to Claim 1,
    characterized in
    that the frictional-force transmission locations (S1, S2) are designed as friction-wheel drives (30, 31).
  3. Device according to at least one of the preceding claims,
    characterized in
    that the frictional-force transmission locations (S1, S2) lie in a plane passing through the centre (M) of the ball and extending parallel to the conveying plane.
  4. Device according to at least one of the preceding claims,
    characterized in
    that the friction-wheel drives (30, 31) are speed-controllable independently of one another.
  5. Device according to Claim 1,
    characterized
    by a blowing and/or suction-air supply in the area of the dome (27) for influencing the conveying of the sheet.
  6. Device according to at least one of the preceding claims,
    characterized in
    that a pass-through hole (28) in a feed table is designed as a suction gap (29) which is connected to a vacuum source.
  7. Device according to at least one of the preceding claims,
    characterized in
    that the surface of the ball is provided with suction holes (41), and that the interior (42) of the ball is connected to a vacuum source.
  8. Device according to at least one of the preceding claims,
    characterized in
    that the ball (18, 40) is made of sintered metal.
  9. Device according to at least one of the preceding claims,
    characterized in
    that the ball (18, 40), including its bearing support, is surrounded by a vacuum chamber (8, 9).
  10. Device according to Claim 1,
    characterized in
    that the feed table (1) is provided with air-injection openings (43) disposed at a distance from the ball (18, 40).
  11. Device according to Claim 1,
    characterized in
    that the ball (18, 40) is freely carried by several bearing balls (19, 20, 21, 22) acting on the ball surface.
  12. Device according to at least one of the preceding claims,
    characterized in
    that the surface of the ball is provided with a friction coating.
  13. Device according to at least one of the preceding claims,
    characterized in
    that the friction-wheel drives (30, 31) are controlled as a function of a contact-free scanning of the sheet.
  14. Device according to at least one of the preceding claims,
    characterized in
    that one of the friction wheels (46) is driven via an intermediate wheel (45).
  15. Device according to at least one of the preceding claims,
    characterized in
    that bearing balls (19, 20, 21) are provided opposite the frictional-force transmission locations (S1, S2).
EP88103791A 1987-03-28 1988-03-10 Device for advancing and orientating sheets in sheet-processing machines Expired - Lifetime EP0288700B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3710259 1987-03-28
DE3710259 1987-03-28
DE3804576A DE3804576A1 (en) 1987-03-28 1988-02-13 DEVICE FOR PROMOTING AND ALIGNING BOWS IN BOW-PROCESSING MACHINES
DE3804576 1988-02-13

Publications (2)

Publication Number Publication Date
EP0288700A1 EP0288700A1 (en) 1988-11-02
EP0288700B1 true EP0288700B1 (en) 1991-07-03

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EP88103791A Expired - Lifetime EP0288700B1 (en) 1987-03-28 1988-03-10 Device for advancing and orientating sheets in sheet-processing machines

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US (1) US4887810A (en)
EP (1) EP0288700B1 (en)
CN (1) CN88101442A (en)
AU (1) AU604861B2 (en)
DE (2) DE3804576A1 (en)

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Publication number Publication date
JPS641544A (en) 1989-01-05
EP0288700A1 (en) 1988-11-02
DE3863471D1 (en) 1991-08-08
CN88101442A (en) 1988-10-12
AU1338088A (en) 1988-09-29
US4887810A (en) 1989-12-19
AU604861B2 (en) 1991-01-03
DE3804576A1 (en) 1988-10-06

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