EP1225043A2 - Device for overturning flat sheets in half-turn revolving sheet-processing machines - Google Patents

Abstract

The invention relates to a device for turning sheets (1, 65) with a transfer drum (9) which is delimited by two sheet-guiding cylinders (1, 20), the transfer drum (9) a turning / storage drum (14, 26 ) and a transport element (17) are assigned and the sheet-processing rotary printing press can be operated in the perfecting and perfecting modes (59, 60). The transfer drum (9) can be driven in opposite and opposite directions of rotation (37, 38) in the beautiful and reverse printing modes (59, 60). Effective gripper systems (12; 15, 25, 40, 44, 46) are accommodated on the lateral surface (10) of the transfer drum (9) in both directions of rotation (37, 38) of the transfer drum (9). <IMAGE>

Description

The invention relates to a device for turning flat specimens in half-speed, sheet-processing machines, such as rotary printing machines.

DE 37 10 257 A1 relates to a sheet-fed rotary printing press for the production of single-sided multi-color printing or perfecting. In the direction of the sheet material is one between the sheet cylinders of two printing units Sheet transfer drum added, according to this proposed solution for Achieving a design that works in particular regardless of format is proposed, the transfer gap between the sheet transfer cylinder and the impression cylinder of the second printing unit compared to the normal gap width to the printing cylinder of the first Printing unit enlarged and the clear space from one to Detect the front or rear edge of the sheet from the circumference of the sheet transfer cylinder movable gripper system is bridged.

DE 37 17 093 A1 also relates to a rotary printing machine for straight printing and Fine and reverse printing. Between the printing cylinders of two printing units is in A sheet transfer cylinder is arranged in the direction of travel of the sheet, with all of the cylinders Gripper systems are assigned. To achieve a design with enlarged The sheet transfer cylinder is also safe to hand over even with thicker substrate Subordinate sheet support with essentially flat and approximately to Sheet transfer cylinder provided tangentially on the top of the support. To this the sheet transfer cylinder pushes the sheet as its approaches The trailing edge of the sheet holding the gripper with the free leading edge in front, whereby the Sheet from the sheet transfer cylinder with the sheet trailing edge from the top of the support is lifted off.

The solutions outlined above have the disadvantage that the sheet material with the respectively freshly printed side necessarily on the outer surface of the Transfer drum (storage drum) rests and to achieve a register Turn is tense. From this inevitable relative movement between Drum jacket and bow follow damage to the printed image.

DE 196 15 730 A1 relates to a turning device for a printing press, especially on a sheet-fed offset printing machine. The turning device for a printing press comprises one between a first impression cylinder and one second impression cylinder arranged transfer drum. Below is this a register cylinder with a plurality of suction openings sucking the sheets, which holds the sheet in register after opening the gripper device Promotes cache system. In this the bow is on a first one, with blow nozzles provided sheet guiding device in a substantially elongated form cached. A tongs reversing gripper device arranged on the transfer drum takes hold of the rear edge of the in the intermediate storage system filed sheet and passes this to a known, the subordinate Counter pressure cylinder formed gripper device, which is turned in this way Sheet is fed to a downstream printing nip for printing on the underside of the sheet.

The disadvantage of this method is the fact that not with simultaneous Gripper closure is worked on the front and rear edge of the sheet.

In addition to the possible solutions outlined in the prior art, this can sheet material can also be stored on the impression cylinder. The sheet-like material is stored on the printing cylinder after printing, then gripped by the transfer drum gripper systems and turned. At the half-turn machine concept, i.e. the execution of the cylinders compared to Printing cylinder twice the circumference of the cylinder ends the printing process, i.e. the Sheets are printed out until the transfer of its leading edge to in straight printing mode the subsequent transfer drum takes place. For this reason, it is necessary to provide a complete sheet length between the printing point and the delivery center. Should a turn of the sheet material can be made below the printing cylinder to provide another sheet length space for storing the sheet.

The provision of a further sheet length results in space below the impression cylinder a certain relative arrangement of transfer cylinders, i.e. Blanket cylinder, impression cylinder and transfer drum relative to each other. Should before Printing site still the space required for ensuring the print quality required sheet guiding elements remain, this requires a large one Cylinder diameter in relation to the maximum substrate length. Go along with that higher manufacturing and manufacturing costs, greater dynamic problems due to the higher masses to be moved and an overall increase in length of Printing presses that occupy the already scarce footprint in print shops.

Common to all the solutions shown is the fact that they have a different design require the transfer drum in the reversing printing unit, compared to the design of the Transfer drum in other printing units. This creates not inconsiderable problems in straight printing mode, in which a multi-color rotary printing press is also operated should be, especially when processing a more rigid substrate such as for example cardboard.

Starting from the outlined prior art, the invention is based on the object using a simultaneous gripper closure of the arcuate material To provide front and rear edges of a sheet turning device with the highest Accuracy works.

According to the invention the object is solved by the features of claim 1.

The advantages of the solution according to the invention can be seen above all in that the Shaping of the sheet-guiding cylinder acting as a transfer drum in the Reverse printing unit with that of the transfer drum in an exclusive The straight printing unit is identical. For example, the sheet transport path is in the straight printing mode Rotary printing press outside of any required for sheet turning Components. The transport route for sheet material, be it paper of any grammage or more rigid cardboard is in the perfecting mode of the Reversing printing unit on the opposite side of the one that functions as the transfer bow-guiding cylinder. The transfer drum, the direction of rotation, for example in Face-print mode corresponds to the clockwise direction in face and reverse printing mode in operated in a counterclockwise direction of rotation and includes on both sides acting gripper systems, so that sheet material in one as the other Direction of rotation can be fixed on the transfer drum.

In a further embodiment of the idea on which the invention is based, the Turning / storage drum and an additional transport element outside the Transport path of the sheet material to the sheet-guiding cylinder in the Face print mode. This also results in the reversing printing unit in Fine print mode of rotation is essentially a sheet run through a pure Schönddruckwerk corresponding sheet passage, so that the reversing printing unit in Faceprint mode is printed with the same high quality standard as pure Beautifully printed works.

The sheet material is transported in the perfecting mode on the side of the lateral surface of the transfer drum between the sheet leading Drums that face the sheet travel path in straight printing mode. By designing the transfer drum as one in both directions of rotation drivable cylinder, the sheet transport path in the straight printing mode is strictly from Decouple the sheet transport path in the perfecting mode. To achieve a collision-free transport of even more rigid printing material through the configured according to the invention, the contour of the transfer drum in withdrawn with respect to the gripper systems recorded on the lateral surface thereof designed so that evasion and safe storage of the to be turned sheet material on the transfer drum ensured during the turn is.

With the configuration of a reversing printing unit proposed according to the invention sheet-processing rotary printing machine can turn / storage drum as well an additionally arranged transport element only in the operating mode Drive perfecting while these components are in straight printing mode of the reversing printing unit can be stopped. This allows on the one hand Saving drive energy, on the other hand, pure straight printing becomes one Reverse printing unit configured according to the invention by for the beautiful / reverse printing mode required components are not affected.

In the perfecting mode, the transport path of the sheet material can be either Printing material in paper form of lighter or heavier grammages, be it printing material in Form of more rigid cardboard and its twist, over a first sheet-guiding Cylinder run, one opposite to the direction of rotation of the straight printing mode rotating transfer cylinder as well as a turning drum and the additional Transport unit, which can also be configured cylindrical, to the second arc-guiding cylinder. Another transport path in beautiful / reverse printing mode of the reversible printing unit proposed according to the invention can run the first sheet-guiding cylinder; also about a single-turn Transfer cylinder, and via opposite to the direction of rotation in straight printing mode rotating transfer drum to one in this variant as a turning drum functioning additional transport cylinder. Furthermore, there is another one Possibility of transporting the sheet material in perfecting mode the transport of the sheet from the first sheet-guiding cylinder to a storage drum given, from there to a transfer drum functioning as a turning drum, from this on an additional transport element, which is also configured as a cylinder can, on the outer surface of the second sheet-guiding cylinder.

In order to guide the sheet material identically, be it lighter and paper heavier grammages or more rigid cardboard, due to the pure printing units and to achieve the reversing printing unit configured according to the invention, will be the first sheet-guiding cylinder, the transfer drum and the second sheet-guiding cylinder preferably designed as a half-revving cylinder, i.e. in compared to Printing forme cylinder with double diameter.

Turning / storage drum as well as the additional, also configured cylindrical In contrast, the transport element can be single-turn or in an integer divider in relation to the diameter of the printing form cylinder. This saves installation space and is in relation to the unprinted side of the sheet material uncritical, since no smearing can occur.

On the one bounded by two half-speed sheet-guiding cylinders in the reversing printing unit Transfer drum effective bilateral gripper systems are included, which in one Design variant as a pliers gripper with an approximately 180 ° swivel movement able to execute. In addition to a 180 ° swivel movement The gripper systems, which are effective on both sides, can be gripped on the Transfer drum also designed as a double gripper with two opposite one another, Form gripper arms that can be driven separately on a common axis. The The gripper fingers of the double gripper each work with a separate gripper support surface together. In addition, it is conceivable that the gripper system acting on both sides on the The outer surface of the transfer drum can also be operated as a curve-controlled, vertically up and down to form movable T-gripper, which is also two separate ones Gripper contact surfaces can be assigned. The vertical movement of the T-gripper on the outer surface of the transfer drum can be, for example, by a Realize lever transmission, its pivoting movement around a fixed bearing by means of a Rollers / cam drives can be generated.

The gripper systems of the transfer drum proposed according to the invention in Reversible printing unit can be used to avoid collisions with others Machine components that can be activated in straight printing mode, i.e. extendable systems design as well as adjustable in a submerged position in the perfecting mode Train gripper systems. For this purpose, the gripper systems on the lateral surface of the Transfer drum as a whole can be moved into the lateral surface of the transfer drum be educated; finally it is also possible to move the gripper fingers around a swivel axis to be designed such that a folding movement describing a 180 ° circular arc is possible.

With all described gripper systems, a reverse acceleration of the sheet material, be it paper or be rigid cardboard over one prolonged period of time because of the transport route of the sheet material collision-free through the theoretical gripper circuit, i.e. the envelope of the Transfer drum and the additional transport element runs as a secant. This Guiding variant of the arched material during the turn resides in one considerably softer acceleration effect; another positive side effect of this Guiding the sheet material during the turn is achieving higher Speeds in the perfecting mode with that according to the invention configured multi-color rotary printing press. The Gripper systems described dive in the collision-prone position to the two Neighboring cylinders in the circular contour of the transfer drum.

In a preferred embodiment variant of the transfer drum and / or the additional transport element within the reversing printing unit can both on the Transfer drum as well as a conical support on the additional transport element be attached, with which in particular the side edges of more rigid Cardboard material can be supported. By means of the conical contact surface having supporting element cooperating fall arresters can more rigid arcuate material on the contact surfaces of the conical support elements press to avoid excessive stretching and thus the risk of collision with the counteract the next arc stored on a cylinder. By means of the catch hooks that can be activated are particularly on the rear edge of stiffer cardboard materials the radius of the cylinder, i.e. from one through that this substrate inherent bending stiffness brought about a stretched position in a wound position, i.e. on the lateral surface employed, slightly curved position. The inclined support surfaces having supporting element arrangement can be used both on the transfer drum become; in another embodiment variant, the additional transport element with installation space conditionally reduced diameter with such, the extended position more rigid material influencing device are provided.

On the reversing printing unit configured according to the invention, there are both a gear train for the Fine print mode and a gear train for the perfecting mode are provided. In straight printing mode, the second sheet-guiding cylinder is driven by a first gear train from which the gears of the turning drum or additional transport element are coupled out. In perfect and reverse printing mode the second sheet-guiding cylinder is driven via a parallel to the first Gear train lying gear train, in which the drive from the first sheet leading Cylinder, for example, via the gear wheel driving the turning drum to another, on the shaft of the transfer drum mounted gear and from this to the Gear of the additional transport element, which in turn is the drive wheel of the drives second sheet-guiding cylinder. All shafts of the cylinders listed are low-friction bearings in the side walls of the reversing printing unit. to Change of the wheel trains depending on the selected operating mode of the reversing printing unit in the gear train preferably a coupling element on the shaft of the transfer drum arranged with which the conversion from face printing mode to beautiful / reverse printing mode by coupling between direct and indirect drive via the Reversing drum can be made on the transfer drum. It is ensures that a simultaneous rotation of the drive systems to each other so that the turning drum depends on the format exactly the end of the on the Printing cylinder lying sheet detected. The conversion takes place in straight printing mode such that that for the back pressure components in a rest position of the turning drum and additional transport system and the transfer drum synchronized with the impression cylinder grippers directly coupled into the drive train becomes.

The configuration of a reversing printing unit proposed according to the invention is preferably used on multi-color rotary presses, in which one - depending on Design variant of the sheet processing machine - number of pure Sheets and the reversing printing unit, in which pure Straight printing as well as reverse printing is possible, switched between them becomes. Thanks to the compatible cylinder diameter, it learns what is to be processed sheet material in straight printing mode in the configuration configured according to the invention Reverse printing unit a sheet guide, the sheet guide in pure printing units largely corresponds. By separating the transport routes of the arcuate Pure face printing mode from the path of the sheet material in the Fine / reverse printing mode in the reversing printing unit configured according to the invention mutual interference in the operating modes excluded.

In straight printing, the transport of the non-turning sheet takes place Material via an optimized transfer drum, while switching to beautiful / reverse printing mode the most suitable for this mode of operation Cylinder components are interconnected.

The invention is explained in more detail below with the aid of the drawing.

Figur 1

eine Zylinderkonfiguration eines erfindungsgemäßen Wendedruckwerkes mit halbtourigem bogenführenden Zylinder,

Figur 2

eine vergrößerte Darstellung eines Zylinderzwickelbereiches,

Figur 3

eine weitere Ausführungsvariante einer Zylinderkonfiguration mit halbtourigen Zylindern,

Figur 4.1

eine vergrößerte Darstellung eines zusätzlichen Transportelementes,

Figur 4.2

eine halbtourige, als Wendetrommel fungierende Übergabetrommel,

Figuren 5.1 bis 5.5

Ausführungsvarianten von beidseitig wirksamen Greifersystemen an der Übergabetrommel,

Figur 6

die sich im Schöndruckmodus und Schön-/Widerdruckmodus einstellenden Bahnen des Greifersystems am Umfang der Übergabetrommel,

Figur 7

die schematische Darstellung eines konischen Stützelementes an der Übergabetrommel und/oder eines zusätzlichen Transportelementes,

Figuren 7.1, 7.2

eine vergrößerte Darstellung eines Fangelementes in Vorder- und Seitenansicht,

Figur 8

ein Geschwindigkeits/Zeitdiagramm für das zusätzlich, beispielsweise zylinderförmig konfigurierte Transportelement,

Figur 9

die Darstellung eines zwischen dem zweiten bogenführenden Zylinder und der Übergabetrommel aufgenommenen zusätzlichen Transportelementes, ausgeführt in einem ganzzahligen Teiler des Durchmessers des Druckformzylinders und

Figur 10

die Räderzüge samt Kupplungselement zum Antrieb des erfindungsgemäß konfigurierten Wendedruckwerkes sowohl im reinen Schöndruckmodus als auch im Schön-/Widerdruckmodus.

It shows:

Figure 1

a cylinder configuration of a reversible printing unit according to the invention with a half-speed sheet-guiding cylinder,

Figure 2

an enlarged view of a cylinder gusset area,

Figure 3

another embodiment variant of a cylinder configuration with half-speed cylinders,

Figure 4.1

an enlarged view of an additional transport element,

Figure 4.2

a half-speed transfer drum that functions as a turning drum,

Figures 5.1 to 5.5

Design variants of gripper systems effective on both sides on the transfer drum,

Figure 6

the webs of the gripper system that appear in the straight printing mode and the perfecting mode on the circumference of the transfer drum,

Figure 7

the schematic representation of a conical support element on the transfer drum and / or an additional transport element,

Figures 7.1, 7.2

an enlarged view of a catch element in front and side view,

Figure 8

a speed / time diagram for the additional, for example cylindrical, configured transport element,

Figure 9

the representation of an additional transport element received between the second sheet-guiding cylinder and the transfer drum, executed in an integer divisor of the diameter of the printing form cylinder and

Figure 10

the gear trains together with the coupling element for driving the reversible printing unit configured according to the invention both in the pure printing mode and in the perfecting mode.

1 shows a first cylinder configuration reversible printing unit configured according to the invention with half-speed sheet-guiding Cylinders closer.

The illustration according to FIG. 1 shows a first sheet-guiding cylinder 2, on the latter Shell surface 3 bends 1. The rear edge of the sheet 1 is designated 1.1, while the leading edge of the sheet is identified by reference number 1.2. The first sheet-guiding cylinder rotates about an axis of rotation 4, the sheet 1 with its Bottom 7 rests on the lateral surface 3 of the first sheet-guiding cylinder 2 and with its printed top 6, which can already be printed in four colors, one Assigning turning drum 14. The front edge 1.2 of the sheet 1 is one of the The lateral surface 3 of the gripper system 5 assigned to the first sheet-guiding cylinder 2 taken. 1 shows the individual states of the movement the sheet leading edge 1.2 when receiving the trailing edge 1.1 of the to be turned Sheet 1 by a turning gripper 15 on a single-turn turning drum 14 out closer.

The sheet 1 is first on the lateral surface 3 of the first sheet-guiding cylinder 2 saved. In order to be able to save, the front edge 1.2 is in Gripper system 5 of the first sheet-guiding cylinder 2 through a transfer center 8 held out and transported to the position shown in Figure 1. With 15.0 it is Position of the sheet trailing edge 1.1 on the lateral surface 3 of the first sheet leading Cylinder 2 marked. At time 15.1, the rear edge 1.1 of the sheet 1 from the reversible gripper 15 by means of a suction element shown only schematically here detected and lifted from the lateral surface 3 of the first sheet-guiding cylinder 2. Then the sheet 1 is gripped against the reference position of the leading edge 1.2, through which Gripper system 5 on the outer surface 3 of the first sheet-guiding cylinder 2 in this Gripper system stretched and aligned in register. At that moment they are Sheet trailing edge 1.1 and sheet leading edge 1.2 each from a fixing system taken. In the position of the rear edge 1.1 of the sheet 1, designated 15.2, that is Trailing edge 1.1 of the aligned sheet from the suction element to the reversible gripper 15 Pass turning drum 14. At this time, the holding system 5 takes on the first sheet-guiding cylinder 2 its position 5.1, i.e. it opens to release the Front edge of sheet 1.2. The reversible gripper system 15 now transfers the rear edge 1.1 of the Sheet 1 in a position designated by 15.3. The front edge 1.2 of the sheet 1 remains continue on the outer surface 3 of the first sheet-guiding cylinder 2 (position 5.2). On a collision-free path 31 past the lateral surface 3 of the first sheet-guiding Cylinder 2 becomes the old rear edge 1.1 of the sheet, which is now the new one Represents the leading edge of the sheet, transferred to position 15.4. At this point, the new one Trailing edge 1.1, i.e. the old sheet leading edge 1.2 in position 5.3 below the open gripper system 5 on the lateral surface 3 of the first sheet-guiding cylinder 2 on. In the position designated by reference number 15.4, the reversing gripper 15 has the Turning drum 14, which rotates about the axis of rotation 16, an approximately 90 ° arc appropriate pivoting movement made. According to the rotational movement the turning drum 14 about its axis of rotation 16 reaches the old trailing edge 1.1 in the position marked with position symbol 15.5 under a further 90 ° Pivoting movement. From the position of the trailing edge marked 15.3 to with position 15.5 designated position of the old sheet trailing edge 1.1 has at the Circumferential surface on a collision-free path 31 guided reversible gripper a 180 ° swivel movement completed and is now in the handover center 13, between Rotation axis 11 of a transfer drum 9 of the rotation axis 16 of the turning drum 14 is formed. At this time, the underside 7 of the sheet 1 is facing outwards, while the printed top, which prints for example two, three or four colors and can be refined, the axis of rotation 11 of the transfer drum 9 assigns.

The transfer drum 9 rotates as shown in Figure 1 against the Clockwise in direction 38 in the perfecting mode when turning sheet material 1. The on the outer surface of the transfer drum 9th recorded gripper systems 12 describe an envelope 10, the The outer surface of the transfer drum 11 itself is designed in a retracted contour can be to the reverse acceleration of the sheet material 1 during the Spread the phrase over an extended period of time. The transport route of the sheet 1 takes place through the theoretical gripper circuit 10, i.e. the envelope of the transfer drum 9 and one of these subordinate additional transport element 17 as a secant. Thereby the acceleration effects are much gentler, the mechanical ones Stresses, in particular the tendency of the sheet material to flutter, are significantly reduced. Furthermore, higher / higher printing can be done in the operating mode Achieve speeds.

This is done on the transfer drum, which has a retracted contour sheet material 1 is gripped by a holding element 12 and in position 15.6 promoted. With position 15.6 the leading edge, i.e. the old rear edge 1.1 of the Sheet 1, gripped by the holding element 12, identified. The one at the clamping point The area adjacent to the arc 1 protrudes into the envelope 11, i.e. the theoretical Gripper circle of the transfer drum 9 into it. From position 15.6 the old one Sheet trailing edge 1.1 of the sheet promoted in position 15.7, in which they on a Delivery center 19 is located. The transfer center 19 is between the axis of rotation 11 the transfer center and the axis of rotation 18 of an additional transport element 17 educated. Gripped elements 32 on the circumference of the additional Transport element 17 is an approximately 90 ° deflection of the sheet 1 and Further funding in position 15.8. Finally the old trailing edge 1.1 reaches the sheet Position 15.9, into which they are on a transfer center 22 between the axis of rotation 18 of the additional conveying element 17 and the axis of rotation of the not shown here second arc-guiding cylinder 20 arrives. Seized by this second arc-holding cylinder 20 received holding elements, the arc 1 is turned on the outer surface 21 of the second sheet-guiding cylinder. The outer surface 21 of the second sheet-guiding cylinder 20 now has the already printed upper side 6 to, while the still unprinted underside 7 of the sheet 1 faces outwards and in following pure straight printing units can be processed.

On the scope of the theoretical gripper circle, i.e. the envelope 10 of the transfer drum 9 can act on both sides effective gripper systems, designated by reference numerals 12, 15, 25, 40, 44, 46 are recorded, which are described in more detail below. In addition, the transfer drum 9 can also be on the theoretical gripper circuit 10 collision-free in certain rotation ranges of the transfer drum 9 below the envelope curve 10 resettable gripper systems 12 that are either theoretical Gripper circuit 10 can be reset or can be folded by 180 °. These variants are also described in more detail below.

Reference number 23 denotes a first gusset area, which is characterized by the Circumferential surfaces of the first sheet-guiding cylinder 2, the transfer drum 3 and the Circumferential surface of the turning drum 14 is formed. Another gusset area is with Reference numeral 24 denotes the one hand from the theoretical gripper circuit 10 of the Transfer drum 9 is limited and by the lateral surface 21 of the second arc-guiding cylinder 20 and finally from the envelope of the additional Transport element 17.

An enlarged representation of a first is shown in the illustration according to FIG Cylinder gusset area.

The trailing edge 1.1 of the sheet 1, the bottom 7 of which on the lateral surface 3 of the first sheet-guiding cylinder 2 is only schematic here by means of one reproduced suction element in position 15.1 gripped and in a reversible gripper 15th the turning drum 14 transferred. The one that grips the rear edge 1.1 of the sheet 1 The reversing gripper guides the rear edge from the lateral surface 3 of the first sheet-guiding Cylinder 2 sheet to be removed in the positions 15.2, 15.3 and 15.4 and describes a collision-free path 31 receding behind the envelope of the turning drum. In position 15.4, the trailing edge 1.1 of the sheet again has the envelope of the Turning drum 14 reached before in position 15.5 to the holding elements 12 on the theoretical gripper circuit 10 of the transfer drum 9 is transferred. In Figure 2 shown state, the transfer drum rotates in the direction of rotation 38, i.e. the Direction of rotation, which is decisive for a perfecting mode 60. The Holding element 12, which has gripped the rear edge 1.1 of the sheet, promotes this in Direction of rotation 38 along the theoretical gripper circle 10 on the transfer drum 9. The printed top 6 is assigned to the transfer drum 9, while the bottom 7 of the sheet 1 faces outwards. With position 28 is the pivoting movement of the Reversible gripper 15 on the collision-free path 31 and on the envelope of the Turning drum 14 designated. The pivotal movement that the trailing edge 1.1 of the sheet 1 is impressed by the movement of the reversible gripper 15 is approximately 180 °.

A further embodiment variant of a results from the representation according to FIG Cylinder configuration of a reversing printing unit with half-speed cylinders. Of the lateral surface 3 of the first sheet-guiding cylinder 2, the sheet 1 passes over a Transfer drum 14.1, rotating about axis of rotation 16, to a transfer drum 9. The transfer drum 9 rotates in the direction of rotation 38 counterclockwise Fine / reverse printing mode. Reference number 8 is the first transfer center between the axis of rotation 11 of the transfer drum 9 and the axis of rotation 4 of the first designated arc-guiding cylinder 2. A first gusset area 23 is formed by the Shell surface 3 of the first sheet-guiding cylinder 2 limited, on the other hand by theoretical gripper circle 10 of the transfer drum 9 and the outer surface of the Drum 14 '. Between the transfer center 13 between the cylinder 14 'and the Transfer drum 9, the sheet material is not shown here Pass gripping devices before the sheet 1 with its top 6 to the outside pointing and assigning its underside 7 to the axis of rotation 11 of the transfer drum 9 is gripped by reversible grippers 25, which are received on a reversing drum 14. The positions which the turning gripper 25 of the turning drum 14 of the rear edge of the Imprinting sheet 1 are marked with position signs 25.1 and 25.2. In the 3, the turning drum 14 is located in the same Obtain diameter as the additional transport element 17 as shown in Figure 1 in its place. The rotating over the axis of rotation 18 transfer Turning gripper 25 of the turning drum 14 the rear edge of the sheet 1 in the area of Transfer center 22 between turning drum 14 and the second sheet-guiding Cylinder 20. As a result, the already printed upper side 6 of the sheet 1 comes into contact the lateral surface 21 of the second sheet-guiding cylinder 20, while not yet printed bottom 7 faces outwards and in subsequent printing processes in pure Straight printing units or also in reversible printing units can be printed.

From the representation according to FIG. 1, an enlarged representation of an additional one is shown Transport element out closer.

The additional transport element 17 delimits a gusset area with its envelope curve 24, which further rotates counterclockwise from the lateral surface 21 second arc-guiding cylinder 20 is limited and on the other hand by the theoretical gripper circuit 10 of the transfer drum 9, which in the Schön- and Back pressure mode rotates in the direction of rotation 38. The old rear edge 1.1 of the sheet is opened the transfer center 19 between the axis of rotation 18 of the additional Transport element 17 and the axis of rotation 11 of the transfer drum 9 is formed. The Gripper system 32 of the additional transport element 17 grips the old rear edge 1.1 of the sheet, so that this between the movable gripper finger 32 and a support 36 is fixed. The gripper fingers 32 are around a fixed bearing 35 by means of a cam roller 33 moves, which in turn runs on the contour of a curve 34. Gripper pad 36 as well Fixed bearings 35, around which the gripper finger 32 pivots, are on the one Rotation axis 18 swinging arm 30 added. From the representation according to 4.1 also shows that the additional transport element 17 is a conical Support element 64 can be assigned, which one to be deflected by approximately 90 ° more rigid material serves as a support surface (see FIGS. 7 to 7.2). If the arm is 30, which rotates clockwise around the axis of rotation 13, the transfer center 22 to reached second sheet-guiding cylinder 20, the sheet 1 is transferred with the old rear edge 1.1 on gripper systems, not shown here, on the lateral surface 21 of the second sheet-guiding cylinder 20 for further processing during the Pass through the printing units of the rotation.

A half-speed configured transfer drum emerges from the representation according to 4.2 out, which acts as a turning drum according to this embodiment. Of the Shell surface 3 of the first sheet-guiding cylinder 2, the sheet 1 goes with its Top 6 to the outer surface 27 of a storage drum 26. The storage drum 26 is preferably of single-speed design and rotates about its axis of rotation 16. At the The lateral surface of the storage drum 26 are only shown schematically here Holder devices 29 are provided, which the front edge 1.2 of the sheet on the Fix lateral surface 27. The clockwise rotating storage drum 26 stores the length of the sheet 1 with the leading edge 1.2 leading on the lateral surface 27, before a tong gripper 25 which can be pivoted through a 180 ° bend and which is based on the theoretical Gripper circle 10 of the transfer drum 9 obtained with the contour 9 withdrawn is provided, grips the rear edge 1.1 of the sheet 1. By rotating the Transfer drum 9 about the axis of rotation 11 in the direction of rotation 38, the by the gripper element 25 gripped sheet 1 at the rear edge 1.1 of the Shell surface 27 of the storage drum 26. During the rotation of the transfer drum 9 in Direction of rotation 38 is carried out by the gripper system designed as a gripper 25 Transfer drum 9 an approximately 180 ° comprising designated 28 Pivoting movement. During the pivoting movement it is achieved that now with respect on the transfer drum 9, the bottom 7 of the sheet 1 faces outwards, while the Top 6 of the axis of rotation 11 of the transfer drum 9 assigns. In the field of Transfer center 19 between the axis of rotation 11 of the transfer drum and the The axis of rotation 18 of the additional transport element 17 goes to the sheet 1 Extent about and is at the transfer center 22 to the lateral surface 21 of the second pass bow-guiding cylinder 20. There the sheet 1 is positioned such that the printed underside 6 of the outer surface 21 of the second sheet-guiding cylinder 20 assigns, while the not yet printed bottom 7 faces outwards. During the Rotation of the second sheet-guiding cylinder 20 counterclockwise is the Sheet 1 supplied with the bottom 7 facing outward further printing units, in which can be further printed on the sheet 1.

Figures 5.1 to 5.5 are design variants of mutually effective Take out gripper systems.

Figure 5.1 shows, for example, a pliers gripper 15, 25, 40, which on the withdrawn contour procured transfer drum 9 can be added. The tong gripper comprises gripper surfaces 43 and is pivotable about an axis 42. The Pivotal movement which the gripper 15, 25, 40 executes about its axis 42 identified by the arrow 28 or 41 configured as an arc.

Figure 5.2 shows a gripper system that also acts on both sides, which is characterized by a Double gripper 44 is formed. The gripper fingers of the double gripper are on one common axis 42 added, with each gripper finger a separate Gripper pad 45 is assigned.

Figure 5.3 shows a T-gripper 46, which is also below the T-shaped crossbar two gripper pads 45 are assigned. The vertical extension and retraction of the tee of the T-gripper 46 is impressed on a hinged lever 47, which around a support 48 is pivotable. The pivoting movement of the lever 47 around the support 48 is initiated by a roller 49, the one on the contour here only schematically reproduced curve 50 rolls.

5.4 shows a holding element 12 on the transfer drum 9 which, in straight printing mode 59, extends its extended position by Pivots axis 42. In the perfecting mode 60, the holding element 12 takes according to the illustration from FIG. 5.4, a submerged position 55. This will be Gripper system pivoted in toto around a support 48. The pivoting movement of the Gripper system, picked up on a lever 47, is actuated by a cam roller 49 impressed, which in turn runs on a curve contour 56.

An alternative solution to collision-free gripper guidance on the Transfer drum is through the design variant of a gripper system according to Figure 5.5 given. there the gripper system is designed as a folding gripper, which is in straight printing mode 59 with a support 58 below the theoretical gripper circle 10 of the Transfer drum 9 cooperates. The folding gripper 57 is about the axis 42 pivotable and describes during its pivoting movement, i.e. his immersion below the theoretical gripper circle 10 an approximately 180 ° rotation, designated 28.

From the illustration according to FIG. 6, they are in the straight printing mode and in the beautiful / reverse printing mode resulting trajectories of the gripper system with respect to the theoretical Gripper circle 10 of the transfer drum 9 in more detail.

The cylinder configuration shown only schematically in FIG. 6 from the first sheet-guiding cylinder 2, transfer drum 9, turning drum 14, additional Transport element 17 and second sheet-guiding cylinder 20 shows that at the Transfer drum 9 recorded gripper systems in straight printing mode 59 one Reference numerals 52 and 53, corresponding to the nominal diameter of the transfer drum 9 Describe the path. In the perfecting mode 60, however, are those Transfer drum 9 assigned gripper systems to a gripper track 54, which recedes behind the theoretical gripper circuit 10, i.e. find the gripper systems reset behind the nominal diameter 52 of the transfer drum 9. So is one collision-free operation of the transfer drum as a sheet-guiding drum in the Fine print mode 59 guaranteed.

From the figure sequence 7, 7.1 and 7.2, a conical shape is shown in a schematic representation Support element more clearly, which both on the transfer drum and / or a additional transport element can be added. The additional transport element 17 or the transfer drum 9 is in side walls 61 or 62 of the invention configured reversing printing unit in the warehouse 69 added. The drive takes place on one Axis 63 via a gear provided on the drive side 61. The bevels 68 comprising conical support elements 64 are in relation to the transfer drum 9 or the additional transport element 17 is positioned such that it is a more rigid material 65 such as cardboard under the side area. Via one in FIG only in a schematic embodiment, catching device 66 are the Side edges of the more rigid box 65 to the inclined surfaces 68 of the conical Support elements 64 pressed so that the more rigid material 65 of an elongated, i.e. position protruding from the peripheral surface into one of the curvature of the peripheral surface of transfer drum 9 or additional transport element 17 corresponding Curvature can be transferred.

Figure 7.1 shows the contact area of the catch element 66 with the lateral surfaces of the more rigid arcuate material 65 on an enlarged scale. The catch element 66 in the form of a hook undergoes a movement about a pivot axis Swivel movement 67, in which it moves from an open position 72 into a closed position Position 73 is transferred. When the catch hook 66 is in the engaged state 73, acting on the underside 7 of the more rigid arcuate material 65, the Edge areas of the printed top side 6 on the inclined contact surfaces 68 of the conical or conical support element 64.

From the illustration according to FIG. 7.2 it can be seen that the more rigid arcuate Material 65 by the employment of the catching element 66 from an extended position 70 in an approximately wound layer 71 is transferred. This creates the risk of collision rear area of the more rigid (cardboard) sheet material 65 with others machine components that are stationary. The contact surfaces 68 of the conical or conical support element 64 can be particularly preferably on a transfer drum 9 or on an additional transport element 17 in Take the shape of a transport cylinder.

FIG. 8 shows a speed / time diagram of an additional one Transport element out closer. With reference number 81, the sheet transfer is one Sheet, be it paper in heavier or lighter grammage or box 65.

The sheet transfer speed is identified by reference numeral 82, the Circumferential speed of the arm 30 of the additional transport cylinder after the Sheet transfer 82 experiences a drop to shortly before the next sheet transfer 81 of the following copy, be it a sheet 1 of paper or a more rigid Printing material such as box 65, again at sheet transfer speed to be accelerated.

From the representation according to FIG. 9, a view of a between the second sheet-guiding cylinder and the transfer drum added additional transport element, which in one integer divider of the diameter of the printing form cylinder is executed. This one out For reasons of installation space, the transport cylinder 17 has a very small diameter on its circumferential surface immersing in or exiting from this Gripper elements 32. These can be one behind the outer surface of the additional Transport element 17 withdrawn position 55 or can from the Step out of the outer surface of the transport cylinder 17 and thus from the transfer drum 9 take over arcuate material 1, 65 and to the lateral surface 21 of a second transfer bow-guiding cylinder 20. Accordingly, similar to the Transfer drum 9 behind the outer surface gripping elements 32 also on take up additional transport element 17 in the form of a transport cylinder.

Finally, from the illustration according to FIG. 10, the gear trains go together Coupling element for driving the reversing printing unit configured according to the invention in straight printing mode as well as in straight printing and reverse printing mode.

The gear train 102 in which the reversing printing unit configured according to the invention is located can be operated in the perfecting mode, is designated by reference number 102, while reference number 103 is in the pure printing operation of the reversing printing unit called setting course of the drive. The individual waves from the first sheet-guiding cylinder 2, turning drum, transfer drum, additional Transport element and second sheet-guiding cylinder are all in one Side wall 99 of the reversing printing unit with bearings shown only schematically here 91 rotatably added.

In straight printing mode 59, the drive of the three half-speed cylinders 1 runs, 9 and 20 via the gear train 103. The drive wheel 90 of the first mesh sheet-guiding cylinder 2, a recorded on the shaft of the transfer drum 9 Drive gear 104 and gear 92, which drives the second arc-guiding cylinder 20 is used together. The drive gears 93 and 94 of Turning drum and additional transport element are stopped, i.e. from the Drivetrain disengaged. This takes place in the perfecting mode 60 Drive from the drive gear 90 of the first sheet-guiding cylinder 2 to the Gear 93, which serves to drive the turning drum 14. This is where the drive comes from over the arranged on the shaft of the transfer drum 9 gear 105 to the Drive wheel 54 of the additional transport element 17 above and from this to the Drive gear 92 of the second arc-guiding cylinder. In this variant is the gear 104 received on the shaft of the transfer drum 14 Travel a or 96 shifted and disengaged from the gears 90 and 92 respectively.

By means of the coupling element 95, an engaged state 97 as well as a reach disengaged state 98. On the shaft of the transfer drum 9 can for example one of the gear wheels 105 or 104 in the axial direction, designated by the Travel 96 are shifted so that the distance a to engage or out Engage, just corresponds to a gear width. The sleeve-shaped element 100, on the circumference of which the outer gear 105 of the shaft of the transfer drum 9 is fastened, returns to a dashed position 101 so that it is effectively disengaged of the gear 104 with the drive gears 90 and 92 of the first and second arc-guiding cylinder 1, 20 is ensured.

This choice of drive wheels is used to switch from straight printing mode 59 to Fine and reverse printing mode 60 by coupling between direct and indirect Drive via turning drum 14 on the transfer drum 9 Rotation of the drive systems to one another such that the turning drum 14th depending on the format, exactly the end of the sheet 1, 65 lying on the printing cylinder detected. In straight printing mode 59, the drive takes place in such a way that the gear wheels 93 and 94, that are required in the perfecting mode 60, in a rest position of Reversing drum 14 and additional transport element 17 are disengaged

LIST OF REFERENCE NUMBERS

1

arc

1.1

trailing edge

1.2

leading edge

2

first arc-guiding cylinder

3

lateral surface

4

axis of rotation

5

grab

5.0

Leading edge location

5.1

Leading edge location

5.2

Leading edge location

5.3

Leading edge location

6

top

7

bottom

8th

Transfer center

9

Transfer drum

10

Envelope curve (theoretical gripper circle)

11

axis of rotation

12

retaining element

13

Transfer center

14

beater

14 '

Transfer cylinder

15

turning gripper

15.0

Trailing edge position

15.1

Trailing edge position

15.2

Trailing edge position

15.3

Trailing edge position

15.4

Trailing edge position

15.5

Trailing edge position

15.6

Trailing edge position

15.7

Trailing edge position

15.8

Trailing edge position

15.9

Trailing edge position

15:10

Trailing edge position

16

axis of rotation

17

additional transport element

18

axis of rotation

19

Transfer center

20

second bow-guiding cylinder

21

lateral surface

22

Transfer center

23

Gusset 1, 9, 14

24

Gusset 9, 17 20

25

turning gripper

26

storage cylinder

27

Storage cylinder jacket

28

180 ° swivel movement

29

Holder means

30

poor

31

collision-free path

32

grab

33

follower

34

Curve

35

fixed bearing

36

Gripper pad

37

Direction of rotation straight printing

38

Direction of rotation fine and reverse printing

40

Clip-on chuck

41

180 ° bend

42

axis

43

gripper surfaces

44

double gripper

45

edition

46

T-gripper

47

lever

48

In stock

49

follower

50

Curve

51

Gripper track beautiful and reverse printing mode

52

Nominal diameter

53

Gripper pad face printing

54

Transfer drum gripper active

55

submerged position

56

Curve

57

folding gripper

58

edition

59

Nice print mode

60

Fine and reverse printing mode

61

driving side

62

operating side

63

axis

64

Cone / cone member

65

cardboard sheet

66

catching element

67

pivotal movement

68

contact area

69

camp

70

stretched location

71

wound position

72

Catch element open

73

Catch element closed

80

bow speed

81

Speed sheet takeover

82

Speed sheet transfer

90

Drive wheel 21

91

camp

92

Drive wheel 20

93

Drive 14

94

Drive 17

95

coupling member

96

Travel Range

97

engaged condition

98

disengaged condition

99

Side wall

100

shell

101

deferred location

102

Fine and reverse pressure wheel train

103

Schöndruckräderzug

104

drive wheel

105

drive wheel

Claims (21)

Device for turning sheets (1, 65) with a transfer drum (9) which is delimited by two sheet-guiding cylinders (1, 20), the transfer drum (9) having a turning / storage drum (14, 26) and an additional transport element (17) are assigned and the sheet-processing rotary printing press is operated in the perfect and perfect / reverse printing mode (59, 60),
characterized in that the transfer drum (9) can be driven in opposite printing directions (37, 38) in straight printing mode and beautiful / reverse printing mode (59, 60) and on the imaginary lateral surface (10) of the transfer drum (9) in both directions of rotation (37, 38 ) the transfer drum (9) effective gripper systems (12; 15, 25, 40, 44, 46) are added. Device according to claim 1,
characterized in that the turning / storage drum (14, 26) and the additional transport element (17) lie outside the transport path of the sheet (1, 65) on the sheet-guiding cylinders (1, 9, 20) in the straight printing mode (59). Device according to claim 1,
characterized in that the transport path of the sheet (1, 65) in the perfecting mode (60) lies on the side of a lateral surface (10) of the transfer drum (9) which corresponds to the transport path of the sheet (1, 65) in the straight printing mode (59 ) is opposite. Device according to claim 1,
characterized in that the transfer drum (9) has a retracted contour relative to the envelope curve (10) of the gripper systems (12; 15, 25, 40, 44, 46). Device according to claim 1,
characterized in that the turning / storage drum (14, 26) and the additional transport element (17) are only driven in the straight printing / reverse printing mode (60), but are stopped in the straight printing mode (59). Device according to claim 3,
characterized in that in the perfecting mode (60) the transport and the turning of the sheet (1, 65) via a first sheet-guiding cylinder (2), a transfer drum (9) driven opposite to the direction of rotation (37) of the straight printing mode (59) , a turning drum (14) and an additional transport element (17) on the second sheet-guiding cylinder (20). Device according to claim 3,
characterized in that, in the perfecting mode (60), the transport path of the sheet (1, 65) via a first sheet-guiding cylinder (2), a single-speed transfer cylinder (14 '), which is opposite to the direction of rotation (37) of the straight printing mode' (59 ) driven transfer drum (9) and an additional transport element (17) functioning as a turning drum. Device according to claim 3,
characterized in that in the perfecting mode (60) the transport path of the sheet (1) from the first sheet-guiding cylinder (2) via a storage drum (26) and the transfer drum (9, 14) functioning as a reversing drum via the additional transport element (17) on the lateral surface (21) of the second sheet-guiding cylinder (20). Device according to claim 1,
characterized in that the first sheet-guiding cylinder (1), the transfer drum (9) and the second sheet-guiding cylinder (20) are designed as half-turn cylinders. Device according to claim 1,
characterized in that the turning / storage drum (14, 16) and the additional transport element (17) are single-speed or in an integral divider with respect to the diameter of a printing form cylinder. Device according to claim 1,
characterized in that the bilaterally effective gripper system on the transfer drum (9) is designed as a pliers gripper system (15, 25, 40) which executes a 180 ° swivel (28, 41). Device according to claim 1,
characterized in that the double-acting gripper system on the transfer drum (9) is designed as a double gripper (44) with two gripper fingers which can be controlled about a common axis (42). Device according to claim 1,
characterized in that the gripper system acting on both sides of the transfer drum (9) is designed as a cam-controlled, vertically displaceable T-gripper (46), to which two gripper contact surfaces (45) are assigned. Device according to claim 1,
characterized in that the gripper system (12) on the transfer drum (9) is designed as a gripper system which can be activated in the straight printing mode (59) and can be set into a submerged position (55) in the perfecting mode (60). Device according to claim 1,
characterized in that the gripper system (12) of the transfer drum (9) is designed as a flap gripper system (57) which can be pivoted about an axis (42). Device according to claim 1,
characterized in that on the transfer drum (9) and / or on the additional transport element (17) a support element (64) having an inclined contact surface (68) is received, against which more rigid sheet material (65) can be adjusted by means of an activatable catch element (66) , Device according to claim 16,
characterized in that the more rigid, arcuate material (65) is transferred by means of the catching device (66) from an extended position (70) to a wound position (71) on the support element (64). Device according to claim 1,
characterized in that in the straight printing mode (59) the second sheet-guiding cylinder (20) is driven by a first gear train (90, 92; 103). Device according to claim 1,
characterized in that in the perfecting mode (60) the second arc-guiding cylinder (20) is driven by a second further gear train (102) containing a coupling element (59), which pulls the gear wheels (90, 92, 93, 94, 104). Printing unit for turning sheet material (1, 65) with a transfer drum (9) which is delimited by two sheet-guiding cylinders (1, 20), the transfer drum (9) a turning / storage drum (14, 26) and an additional transport element ( 17) are assigned and the sheet-processing rotary printing machine is operated in the perfect and perfect / reverse printing mode (59, 60),
characterized in that the transfer drum (9) can be driven in opposite printing directions (37, 38) in straight printing mode and beautiful / reverse printing mode (59, 60) and on the imaginary lateral surface (10) of the transfer drum (9) in both directions of rotation (37, 38 ) the transfer drum (9) effective gripper systems (12; 15, 25, 40, 44, 46) are added. Multi-color rotary printing machine with a device for turning sheets (1, 65) with a transfer drum (9) which is delimited by two sheet-guiding cylinders (1, 20), the transfer drum (9), a turning / storage drum (14, 26) and a additional transport element (17) are assigned and the sheet-processing rotary printing press is operated in the perfect and reverse / perfecting mode (59, 60),
characterized in that the transfer drum (9) can be driven in opposite printing directions (37, 38) in straight printing mode and beautiful / reverse printing mode (59, 60) and on the imaginary lateral surface (10) of the transfer drum (9) in both directions of rotation (37, 38 ) the transfer drum (9) effective gripper systems (12; 15, 25, 40, 44, 46) are added.

Images