EP3953181A1

EP3953181A1 - Sheet-processing machine with a turning device, method for conveying sheets, and use of sheet directing elements which contain deionization devices

Info

Publication number: EP3953181A1
Application number: EP20730020.3A
Authority: EP
Inventors: Heinz Michael Koch; Mario Herzog; Tilo Hanke; Dietmar Lange; Michael GEIHSLER
Original assignee: Koenig and Bauer AG
Current assignee: Koenig and Bauer AG
Priority date: 2019-07-09
Filing date: 2020-06-02
Publication date: 2022-02-16
Anticipated expiration: 2040-06-02
Also published as: EP4209350A1; CN116039240A; EP4209351A1; US20220204295A1; US11498790B2; EP4209351B1; EP4209352A1; JP2022525694A; WO2021004696A1; EP3953181B1; CN113891801A; DE102019118568A1; EP4209349A1; JP2023100742A; JP7315720B2

Abstract

The invention relates to a sheet-processing machine (1) with a turning device (3). Sheets can be transferred from a sheet guiding cylinder (16) by a sheet conveyor system (17) in the turning device (3), and the sheets can be conveyed in a sheet conveyor direction (BFR) on a sheet conveyor path. A sheet directing element (9) is provided below and/or along the sheet conveyor path, wherein a deionization device (8) is paired with the sheet directing element (9). The invention additionally relates to a deionization device (8) for providing positive and negative ions and to the use sheet directing elements (9) containing deionization devices (8).

Description

Sheet processing machine with a turning device, method for conveying sheets and use of sheet guide elements containing deionization devices

The invention relates to a sheet processing machine with a turning device, a method for conveying sheets in particular in a turning device of a sheet processing machine and the use of a sheet guide element containing a deionization device in a sheet processing machine, in particular a turning device of a sheet processing machine.

In sheet-fed printing presses, for example, there can be increased electrostatic charging of the sheets, especially at high speeds, especially in printing units. In the printing units, this leads to the fact that a printed sheet is attracted to the following sheet guide plates even in spite of the introduction of air cushions and smears the fresh color of the underside on the sheet guide plates.

In the turning area, too, there can be increased electrostatic charging of the printed sheets, especially at high speeds. This leads to the sheets entering the cylinder gussets between the turning drum / printing cylinder or the subsequent printing zone. The sheet can no longer be pushed on the surface of the impression cylinder during a smoothing process and is then folded.

From EP 0 306 682 A2 a device for conveying sheets through the printing zone of the blanket cylinder and printing cylinder of a sheet-fed rotary printing press is known, with deionizing bars placed in front of the two ionization bars generating dissimilar charges, which are placed on the sheet from below or above, to neutralize the sheets are directed, both z. B. with suitable AC voltage are fed. This neutralization of the charges creates clear starting conditions for the subsequent positive charging of the arc. To cancel the frictional connection between the sheet and a cover, a further deionization bar is arranged shortly before the transfer point of the printed sheet to the gripper systems of the sheet removal drum. The arrangement is quite complex and increases the adhesion of the sheet to the cylinder.

A device for removing electrical charges from flat material is known from EP 1 155 834 A2, the positive charge of a print carrier lying on a metal plate being compensated for by means of first ionizer tips. Due to the remaining negative charge on the underside of the print carrier, the latter rests with the discharged surface on another metal plate, the negative charge being compensated by the downstream ionization rod. This complex arrangement is not suitable for sheet guiding elements in sheet processing machines, in particular in turning devices of sheet processing machines.

From EP 1 679 187 B1 a sheet guiding device with an electrically insulated, comb-shaped edge is known, an unloading device for unloading the printing material sheets being arranged in the area of the edge. The arrangement in the edge close to the printing cylinder causes a reduced effect. The edge made of non-conductive material is subject to increased wear, especially in the critical area of the sheet transfer zone, and causes weaknesses in stability in the event of a crash. Furthermore, the arrangement of the discharge device in the concentric conductor track makes it difficult to maintain the optimal electrode spacing, which leads to a reduced effect.

A device for electrostatically influencing signatures is known from DE 197 55 745 A1, a flat charging electrode being applied to the guide surface of a sheet guide plate. The device is intended to pull the sheets onto the sheet guide plate by an attractive effect and by blowing air in one To be kept levitated. In reality, a stable floating height of the arches cannot be kept constant by such a device. Furthermore, the flat contact electrode interferes with the nozzle distribution, which must be designed according to the need for arch support.

From DE 100 38 774 A1 a fan unit in a printing press is known which comprises controllable ion fans. In a sheet turning device, too, a printing substrate sheet can be guided and turned by means of a generated negative pressure on the turning drum. For this purpose, fan units containing ionic fans can be arranged within a cylinder or integrated into its surface. This is complex and also not sufficiently effective.

From DE 10 2007 049 643 A1 a device for turning a sheet while it is being conveyed through a printing press is known, a brake arrangement for a sheet being fixed to the frame. The braking arrangement consists of a generator for an alternating magnetic field and a pneumatic guide device for the sheet. When the sheet runs past the generator, a current should be induced in the ferromagnetic material of the sheet or the printing ink on the sheet. A magnetic field emanating from the eddy current is intended to counteract the field of the generator so that the arc is braked. The effect of this principle is questionable. The arcs are also not discharged because no ions are emitted by the generator.

From DE 10 2010 028 702 A1 a turning device of a sheet-fed printing machine is known, the sheet transport path on or in connection with a storage drum being assigned an ionization device, whereby the sheets guided on the storage drum or those fed to the storage drum can be charged with electrical charges. The invention is based on the object of creating an alternative sheet processing machine or an alternative method for conveying sheets in a sheet processing machine or to improve sheet guidance in general in a sheet processing machine, in particular a turning device of a sheet processing machine. In particular, reliable sheet guidance is to be improved, especially in the area of a turning device, especially with low grammage or film sheets.

According to the invention, the object is achieved by the features of an independent claim. Advantageous configurations emerge from the subclaims, the description and the drawings. At this point, all embodiments of the invention disclosed in the claims of the documents originally submitted are explicitly included in the description.

The invention has the advantage that an alternative sheet processing machine or an alternative method for conveying sheets in a sheet processing machine is created. In particular, the sheet guidance is further improved precisely in the area of a turning device, which can advantageously lead to a significant increase in the performance of a sheet-processing machine, for example a sheet-fed printing machine, in particular a sheet-fed offset printing machine.

Deionization of a sheet can particularly preferably be achieved after the sheet has been detached from a sheet guide cylinder, in particular a storage drum, in a turning device. The machine can be suitable or equipped for processing sheets of low grammage and / or for processing foil sheets. The machine can process sheet material with a grammage of more than 250 g / m ² , but preferably less than 250 g / m ² , particularly preferably less than 150 g / m ² and very particularly preferably less than 80 g / m ² , in particular printed and / or painted. One, two or even more discharge electrodes can preferably be arranged in the area of the sheet guide element, in particular a sheet guide plate of a turning device. The arrangement can take place as a cassette. For example, one or more discharge electrodes can be placed on the sheet guide plate, or one or more discharge electrodes can be embedded in the sheet guide plate. In this case, electrodes that are let in are preferably each positioned between insulators, the surfaces of which in particular terminate tangentially on the sheet guide plate.

The sheet guide element, in particular the sheet guide plate, preferably delimits the long side of a turning area of a turning device downwards. The sheet guide element, in particular the sheet guide plate, is preferably spaced from the cylinder tangent between a storage drum and a turning drum in such a way that the distance to the sheet corresponds to the optimal electrode spacing. Furthermore, a device, in particular a suction cup on the storage drum, can be provided which also spans or tightens the sheet in the vicinity of the cylinder tangent between the storage drum and turning drum, so that not only the optimal electrode spacing is maintained over the entire sheet length, but also the influence there can be carried out on the arc, where it remains free of ion-binding contact with mass-laden machine parts on the top and bottom, so that the ions can pass into the activated deionizing ambient air with little hindrance, which ultimately leads to the maximum possible discharge of the arc.

A discharge cassette is preferably introduced into the sheet guide element, in particular sheet guide plate under the turn for discharging the sheets. A discharged sheet is freed from the effects of electrostatic forces and can be smoothed so that it can pass a subsequent processing station or printing zone without waves and without wrinkles. In machines containing turning devices, especially when processing printing materials with a low grammage or made of film material, it makes sense to provide deionization devices in addition to the deionization device in the turn in further or preferably all printing units and possibly further plants and / or a display, since the printing material always is recharged in a pressure zone. For this purpose, sheet guide elements which are designed as sheet guide plates and contain deionization devices are preferably used which, at a suitable distance from the sheet conveying path, particularly advantageously ensure optimum discharge and guidance of the printing materials at the same time.

The invention is to be explained below by way of example. The accompanying drawings show schematically:

Fig. 1: Detail of a sheet processing machine with a one

Sheet guide element assigned to the sheet conveying system of a printing unit;

2: an enlarged view of a comb finger

Sheet guide plate with deionization device;

3: perspective view of the sheet guide plate with comb fingers and deionization device;

Fig. 4: enlarged view of a cover having

Sheet guide plate;

5: Cover for deionization device;

6: Perspective view of a one having a cover

Sheet guide plate;

Fig. 7: Detail of a sheet processing machine with a

Turning device with a sheet guide element having a deionization device; 8a: an embodiment of a sheet guide plate of the turning device with an attached discharge electrode;

8b: embodiment of a sheet guide plate of the turning device with integrated discharge electrodes;

Fig. 9: Detail of a sheet processing machine with a last one

Sheet guide cylinder and a delivery;

10: sheet guide cylinder with downstream chain wheel shaft and sheet guide plate arranged below the chain wheel shaft;

11: Sheet guide cylinder with a downstream chain wheel shaft and sheet guide plate arranged below the chain wheel shaft and having a cover.

1 shows, for example, a section of a sheet-processing machine 1, in particular a sheet-fed printing machine, here specifically a sheet-fed offset rotary printing machine, preferably in aggregate and in-line design, in particular for sheet processing. In a preferred embodiment, the machine 1 is a sheet-film processing machine, in particular with appropriate equipment. An offset printing machine 1 can be operated accordingly in the offset process, but other printing processes such as. B. screen printing, inkjet, etc. can be used in the machine 1. The machine 1 contains any number of sheet processing plants, which can be designed, for example, as plant, primer, printing, varnishing, drying, inspection and / or finishing plants, for example inline processing plants. In the aggregate and in-line design, the units of the machine 1 arranged one after the other are preferably of largely identical design, it being possible, for example, to use identical substructure modules. Furthermore, the machine 1 can contain a feeder for sheet feed or an output device for discharging the processed sheets. Furthermore, the machine 1 could also have inline processing devices and / or also one or more inline processing units, which, for example, as a film finishing unit, Cold foil works, calender works, punching works, numbering works, screen printing works, perforating works, embossing works, etc. can be executed. In particular, a turning device 3 is arranged between two units of the machine 1, with which the sheets are turned in a perfecting mode. The machine 1 is preferably designed to be switchable between the straight printing and perfecting printing modes.

The machine 1 contains in particular at least two or a plurality of printing units 2 and / or one or more coating units for processing sheets. The printing units 2 of the machine 1 preferably each contain a transfer cylinder or blanket cylinder 6 and a forme cylinder or plate cylinder, not shown further. A blanket cylinder 6 of a printing unit 2 interacts with a sheet guide cylinder, in particular a printing cylinder 5. A sheet conveying system, preferably a sheet conveying drum 7 or a transfer drum or a transfer cylinder, is provided between two sheet guiding cylinders, in particular printing cylinders 5. The printing cylinder 5 and the sheet feed drum 7 are double-sized and the blanket cylinders 6 and the plate cylinders are single-sized. Single-size cylinders can accommodate approximately one and double-size cylinders can accommodate approximately two sheets of maximum format simultaneously on the circumferential side. In an alternative embodiment, the sheet guide cylinders, in particular pressure cylinders 5, or transfer or transfer drums could also be single-sized, triple-sized or larger.

The double-sized printing cylinders 5 and the sheet conveying drum 7 each preferably have two gripper systems for fixing sheets to be conveyed, in particular sheets of film. These gripper systems, arranged diametrically to one another, for example in gripper channels, hold the sheet to be processed for conveyance. The gripper systems preferably have fixed gripper supports which interact with gripper fingers, which can be moved via roller levers by means of control cams and cam rollers, for example, to clamp the sheets. The gripper surcharges from The printing cylinder 5 and the sheet conveyor drum 7 describe a gripper impact path during their respective rotation, which largely corresponds to the sheet conveying path. During the conveyance, the sheets can rest on the respective cylinder or the cylinder jacket surface of a sheet guide cylinder, in particular the printing cylinder 5. The sheets are transferred between the sheet guide cylinders, in particular the printing cylinders 5, and the sheet conveying systems, in particular the sheet conveying drums 7, of the printing units 2 of the machine 1, preferably in the gripper. The last work of the machine 1 is preferably followed by a delivery 4 with a delivery chain circuit, which takes the sheets from the last sheet guide cylinder, in particular a printing cylinder 5, by means of a gripper carriage and conveys them to a delivery stack. For example, a last work of the machine 1 in front of the delivery 4 can be designed as a printing, varnishing, drying, inspection or finishing work such as an inline processing work.

In the printing units 2 of the machine 1, the blanket cylinders 6 are in operative connection with the plate cylinders and known inking or inking and dampening units are arranged which apply the corresponding printing ink to a printing plate tensioned on the respective plate cylinder. A plate cylinder is inked by at least one but preferably several rollers of the associated inking or inking and dampening unit during its rotation. When the plate cylinder unrolls on the blanket cylinder 6, the printing ink is transferred to the blanket-covered blanket cylinder 6 in accordance with the motif. Between a blanket cylinder 6 and a printing cylinder 5, a printing gap or a printing zone is formed through which the sheet to be printed is conveyed by the printing cylinder 5 by means of the gripper systems. In the printing nip, the printing ink is transferred from the blanket cylinder 6 to the sheet according to the motif. The printing cylinder 5 has, in particular, a full-surface jacket surface for carrying the sheets to be conveyed, which surface forms the printing gap with the rubber blanket of the rubber cylinder 6. A plate cylinder and a blanket cylinder 6 of a respective printing unit 2 of the machine 1 preferably each have a cylinder pin on both sides, via which the cylinders are rotatably mounted in the frame of the respective printing unit 2. Both plate cylinders and blanket cylinders 6 preferably each have bearer rings (not shown) which are arranged on both sides. The plate cylinder bearer rings are in contact with the rubber cylinder bearer rings during the printing process and roll off one another under pressure. The bearer rings are preferably dimensioned in such a way that no significant torque transmission takes place between the cylinders during pressure operation, that is to say no predetermined torque is transmitted via the bearer rings.

The machine 1 preferably has a drive gear train which, particularly preferably as a continuous drive gear train, drives the sheet guide cylinders, in particular the printing cylinders 5 of the printing units 2. The sheet conveying systems, in particular the sheet conveying drums 7 or transfer drums or transfer cylinders, are preferably also driven by the drive gear train. For this purpose, the printing cylinders 5 and the sheet conveying drums 7 each have intermeshing gears which form the drive gear train. The drive wheel train is driven by at least one main drive motor which drives the machine 1 in the center or preferably in the area of the front units. For example, the main drive motor can be driven into the first printing unit 2 immediately following the contact unit in the sheet conveying direction BFR, in particular onto the gearwheel assigned to the shaft of the first printing cylinder 5. The cylinders or drums are driven around their respective axes of rotation by the continuous drive wheel train. The blanket cylinders 6 of the printing units 2 are preferably also driven from the drive train. Further rotating bodies or rollers of the machine 1 or the printing units 2 can also be driven at least temporarily by the drive train, and these can also be designed to be coupled to the drive train. For example, one or each plate cylinder of a printing unit 2 can be assigned an individual drive, in particular a plate cylinder direct drive. Direct drives are in particular individual drives, the rotors of which are aligned and concentrically preferably attached directly to the assigned cylinders. During the printing, the plate cylinder in question can then follow the blanket cylinder 6, which is preferably driven by the main drive motor via the drive wheel train, in an electronically synchronized manner. For this purpose, the plate cylinder and / or blanket cylinder 6 can be assigned a rotary encoder which can be connected to a quality control device, a control unit of the printing unit 2 and / or the machine control. Alternatively, the plate cylinder (s) can also be driven via the drive wheel train from the main drive motor, for example via clutches.

In the case of a machine 1 which processes sheets of film, sheet substrate containing sheet material or sheet substrate consisting of sheet material is processed, in particular printed and / or painted. The sheet processing machine 1 has, in particular, suitable equipment for processing foil sheets. The foil sheet processing machine is preferably designed as a foil sheet printing machine at least for printing foil sheets. In particular, the machine 1 can have a foil sheet processing package which is specially adapted to the foil material. For example, the machine 1 can contain at least one primer unit, for example upstream of the printing units 2, and / or contain a special double sheet control device and / or the gripper systems of the machine 1 can be adapted to the low thickness of the sheet material and / or printing inks and / or varnishes or dryers used be adapted to the film material. Foil material can for example be foil made of PVC, PP, PS, PET. Furthermore, a machine 1 could also process special papers, laminated papers or cardboard boxes. In the case of foil printing in particular, the foil sheets are charged in each active printing unit 2 of the machine 1. The foil sheets are again extremely statically charged with each printing process. In particular, deionization devices 8 are therefore provided at least in the printing units 2 and / or coating units of the machine 1, which are arranged downstream of the printing nip of the first printing unit 2 of the machine 1 with respect to the sheet conveying direction BFR. Deionization devices 8 are preferably provided in all the units of the machine 1 downstream of the first printing unit 2. However, a deionization device 8 can also be assigned to an installation unit and / or the first printing unit 2 of the machine 1. The deionization devices 8 are in particular provided in each printing unit 2 and / or coating unit of the machine 1, with only one deionization device 8 being arranged in particular in each printing unit 2 and / or coating unit. More preferably, such a deionization device 8 is also provided in one or each additional plant, such as a paint, drying, inspection or finishing plant. Charging devices for the targeted charging of cylinders or sheets are in particular not provided.

The sheets, in particular film sheets, are conveyed or transported along a sheet conveying path by the sheet guide cylinders, in particular pressure cylinders 5, and the sheet conveying systems, in particular sheet conveying drums 7, of the machine 1. In this case, a sheet guide element beginning in the area of the sheet guide cylinder, in particular the printing cylinder 5, is provided in particular below and along the sheet conveying path in one or all of the printing units 2. Such a sheet guide element is preferably designed as an in particular metallic sheet guide plate 9, which extends in particular over the width of the machine. In particular, such a sheet guide plate 9 has comb fingers 10 in the area facing the sheet guide cylinder, in particular the impression cylinder 5. With regard to the sheet conveying direction BFR, the comb fingers 10 are in particular adjoined by a deionization device 8, the comb fingers 10 of the sheet guide plate 9 in particular partially or completely consist of metallic material. Furthermore, the comb-shaped areas of the sheet guide elements could be provided with blown air openings and, in particular, could be switched to blown air so that a force acting pneumatically on the sheet can be generated in these areas. In particular, the sheets, in particular sheets of film, could therefore be peeled off by the pneumatically acting comb fingers 10 from the lateral surface of the upstream sheet guide cylinder, in particular the printing cylinder 5. The arc guide surfaces of the comb fingers 10 are accordingly assigned blown air openings which can be acted upon by an overpressure. In particular, the overpressure above ambient pressure exerts a blown air effect on the sheets conveyed along the sheet conveying path.

A sheet guide element, in particular a sheet guide plate 9, below a sheet conveying system, in particular a sheet conveying drum 7, can consist of a one-piece sheet metal or also be composed of several parts. For example, an upstream guide piece can form a first area and a downstream guide piece can form a second area for sheet guidance. For example, a first section or sheet metal section can extend from the jacket of the sheet guiding cylinder, in particular the printing cylinder 5, to perpendicularly below the axis of rotation of the sheet conveying drum 7. A second section or partial sheet can connect in the sheet conveying direction BFR and extend as far as the lateral surface of the downstream sheet guide cylinder, in particular the printing cylinder 5. A deionization device 8 is assigned in particular to the first section of the sheet guide element. In particular, the deionization device 8 is assigned to the sheet guide element or the sheet guide surface of the sheet guide element in the area of the upstream sheet guide cylinder, in particular the printing cylinder 5. In this case, the deionization device 8 particularly preferably forms the sheet guide surface in its arrangement area. In particular, the sub-section or a second area of the sheet guide element, in particular the sheet guide plate 9, arranged downstream with respect to the sheet conveying direction BFR is designed concentrically to the axis of rotation of the sheet conveyor system, in particular the sheet conveyor drum 7. In particular, the sheet guide surface of the second section of the sheet guide element, in particular of the sheet guide plate 9, is designed concentrically around the axis of rotation or the gripper impact path of the sheet conveyor drum 7. The first section of the sheet guide element, in particular the sheet guide plate 9, in or from the area of the sheet guide cylinder, in particular the printing cylinder 5, can have a sheet guide surface that continuously approximates the axis of rotation of the sheet conveyor system, in particular the sheet conveyor drum 7. The sheet guide element is thus designed in a spiral shape. The first section can also be designed concentrically around an axis spaced apart from the axis of rotation of the sheet conveying drum 7.

In particular, at least one fan 14 can be assigned to a sheet guide element, in particular a sheet guide plate 9, which fan can be controlled in particular to generate blow and / or suction air. A fan 14 is preferably arranged on the sheet guide element, in particular a sheet guide plate 9, in such a way that it generates blow and / or suction air in the area of the sheet guide surface of the sheet guide element, in particular of the sheet guide plate 9. Corresponding openings, for example Venturi nozzles, are assigned to the sheet guide element, in particular sheet guide plate 9, facing the sheet conveying path. Outside of any openings provided, the sheet guide element, in particular sheet guide plate 9, but preferably has a closed sheet guide surface.

In particular, a sheet guide element, in particular sheet guide plate 9, can be designed in such a way that a sheet guide surface in the area of the lateral surface of the sheet guide cylinder, in particular printing cylinder 5, starting up to the downstream sheet guide cylinder, in particular printing cylinder 5, below the Sheet conveyor system, in particular the sheet conveyor drum 7, extends. A first area of the sheet guide element, in particular sheet guide plate 9, which begins in the area of the upstream sheet guide cylinder, in particular pressure cylinder 5, can have comb fingers 10 and can be further spaced from the axis of rotation of the sheet conveyor system, in particular sheet conveyor drum 7, as a subsequent second area of the sheet guide element, in particular sheet guide plate 9. A largely closed sheet guide surface for the sheets is preferably formed by the comb fingers 10 and the first region of the sheet guide plate 9.

The first area of the sheet guide plate 9 can begin in an angular rotation range of the sheet conveyor drum 7, which is between 15 ° and 25 °, in particular approximately 20 °, from the transfer center formed by the gripper connection between the upstream printing cylinder 5 and the sheet conveyor drum 7. The sheet guide plate 9 or the comb fingers 10 can be arranged at a distance of, for example, 2 mm to 50 mm, in particular between 25 mm and 30 mm, from the sheet conveying path formed by the gripper impacts of the sheet conveyor drum 7. The first area of the sheet guide plate 9 preferably steadily approaches the axis of rotation of the sheet conveying drum 7 or the sheet conveying path.

In a second area of the sheet guide plate 9 adjoining the first area of the sheet guide plate 9 in the sheet conveying direction BFR, the sheets are preferably guided concentrically to the axis of rotation of the sheet conveying drum 7 or parallel to the gripper impact path of the sheet conveying drum 7 or parallel to the sheet conveying path. The second area of the sheet guide plate 9 can be designed, for example, 5 mm to 10 mm apart from the sheet conveying path. The second area of the sheet guide plate 9 can begin, for example, in an angle of rotation range of 60 ° to 90 ° from the transfer center between the printing cylinder 5 and the sheet conveying drum 7. The sheet guide element, in particular the sheet guide plate 9, can thus be designed in such a way that its with respect to the Sheet conveying direction BFR upstream first area has a multiple, for example double or triple, distance to the gripper impact path or to the sheet conveying path in comparison to the downstream second area.

A deionization device 8 is preferably arranged in the first region of the sheet guide plate 9, this being arranged downstream of the comb fingers 10 in the sheet conveying direction BFR if the comb fingers 10 are provided. Comb fingers 10 can extend, for example, over an angle of rotation range of the sheet conveying drum 7 of approximately 5 °. A deionization device 8 can directly adjoin the comb fingers 10 or extend over a rotational angle range of the sheet conveying drum 7 of at least approximately 10 °. The sheet guide surface of the sheet guide plate 9 formed by the comb fingers 10 and / or deionization device 8 approaches the axis of rotation of the sheet conveyor drum 7 or its gripper impact path or the sheet conveyor path, viewed in the sheet conveying direction BFR. For example, the first area of the sheet guide plate 9 can merge into the second area within an angle of rotation range of the sheet conveying drum 7 of, for example, approximately 60 °, which is largely concentric with the sheet conveying path. The machine 1 can have further units or printing units 2, some or preferably all units or printing units 2 comprising or containing sheet guide elements, in particular sheet guide plates 9, for sheet guidance. The sheet guide elements, in particular sheet guide plates 9, of the machine 1 are designed in particular to be identical.

2 shows an enlarged view of a sheet guide element designed as a sheet guide plate 9 with a deionization device 8. The deionization device 8 here has a cassette with at least one discharge electrode 12 arranged in the sheet guide plate 9. The cassette can preferably be embedded in the sheet guide plate 9 below a sheet conveyor system, in particular the sheet conveyor drum 7, and can also have a plurality of preferably identical discharge electrodes 12. Prefers the cassette has two discharge electrodes 12 here. The cassette is preferably arranged downstream of metallic comb fingers 10, it being possible for an upstream guide surface section 9.1 to be formed between the comb fingers 10 and the cassette. In the sheet conveying direction BFR, the cassette of the deionization device 8 is preferably directly adjoined by a downstream guide surface section 9.2 of the sheet guide plate 9. In this arrangement, the upstream guide surface section 9.1 and the downstream guide surface section 9.2 are part of a common guide surface of the sheet guide element 9. Particularly preferably, the upstream guide surface section 9.1 and / or the downstream guide surface section 9.2 are also metallic.

The sheet guide element, in particular the sheet guide plate 9, preferably encloses the sheet conveying system, in particular the sheet conveying drum 7, for example a transfer drum without a jacket surface, in a spiral shape. This means that the front part of the sheet guide element, in particular of the sheet guide plate 9, is kept at a greater distance from an axis of rotation of the sheet conveyor system, in particular the sheet conveyor drum 7, than the following part of the sheet guide element, in particular of the sheet guide plate 9. The sheet guide element, in particular the sheet guide plate, then goes 9, preferably tangentially in a concentric radius to the sheet conveyor system, in particular the sheet conveyor drum 7, in order to realize the optimal electrode spacing in the areas of the greatest distance of the guide plate spiral, with the exception of the comb fingers 10. This means that the guide surface of the sheet guide element 9 in the sheet conveying direction BFR approaches the radius of the sheet conveying drum 7 and then leads around the sheet conveying drum 7 concentrically to the radius thereof.

3 shows a perspective view of the sheet guide element, in particular the sheet guide plate 9, with comb fingers 10 and deionization device 8. The comb fingers 10 facing a sheet guide cylinder, in particular the impression cylinder 5 contain spaced apart, in particular metallic, finger elements between which the movable gripper fingers of the gripper systems of the sheet guiding cylinder, in particular of the printing cylinder 5, can be passed. The comb fingers 10 can, for example, be arranged at a distance of a few millimeters, for example between 1 and 10 mm, preferably between 2 mm and 3 mm, from the lateral surface of the printing cylinder 5. With regard to the sheet conveying direction BFR, the comb fingers 10 are followed by the deionization device 8. The deionization device 8 preferably contains both insulators 11 and one or more discharge electrodes 12 provided with electrical connections. The discharge electrodes 12 are connected to a controllable generator, in particular a high-voltage generator.

The insulators 11 of the deionization device 8 are each arranged transversely to the sheet conveying direction BFR, preferably over the entire width of the sheet guide plate 9 and have surfaces arranged perpendicular to the sheet conveying path or to the sheet guide surface of the sheet guide plate 9. Each discharge electrode 12 is arranged here in particular between two insulators 11. A front insulator 11 with respect to the sheet conveying direction BFR adjoins the, in particular metallic, comb fingers 10 with its vertical or tangential surface. After the deionization device 8, the sheet guide plate 9 preferably directly adjoins a vertical or tangential surface of a rear or last insulator 11 with respect to the sheet conveying direction BFR.

4 shows an enlarged view of a sheet guiding element having a cover, in particular a sheet guiding plate 9. The complete deionization device 8 or the complete unloading cassette can be arranged in the sheet guiding plate 9 in an exchangeable manner. Alternatively, the deionization device 8 can also, for example, be left rigid or by means of displacement in the sheet guiding element, with a cover, for example a cover part 13, also covering the opening can close. For example, the discharge-generating elements are covered by means of a cover made of non-conductive material, in particular plastic, which in particular has openings or cutouts. The cutouts are preferably arranged in such a way that the charge carriers of the discharge electrodes 12 are not influenced. It is preferably arranged above the discharge cassette in such a way that the ions exit through preferably narrow slits and can thus reach the underside of the sheet.

FIG. 5 shows, for example, a cover for a deionization device 8 of a sheet processing machine, as described above. The cover is arranged as a cover part 13 transversely to the sheet conveying direction BFR over the deionization device 8, in particular a discharge electrode 12, which is not shown, and is in particular made entirely from a non-conductive material, in particular plastic. The cover part 13 has a plurality of preferably evenly arranged oblong holes oriented transversely to the sheet conveying direction BFR, which here have, for example, a dimension of 25 mm transverse to the sheet conveying direction BFR and 8 mm in the sheet conveying direction BFR. In this case, in particular, an electrode tip of the deionization device 8, in particular the discharge electrode 12, which emits positive ions and a negative ions emit, is assigned to each elongated hole. The electrode tips indicated here act through the elongated holes, but in particular do not protrude into the sheet guiding surface of the cover. The electrode tips are accordingly preferably arranged below the surface or at a distance from the sheet guide surface of the cover part 13. A discharge electrode 12 here has alternating, in particular equally spaced apart, electrode tips which emit positive and negative ions and which can work with or without the assistance of blown air.

FIG. 6 shows a perspective view of a sheet guide element having a cover part 13, in particular a sheet guide plate 9. The cover part 13 is inserted in the sheet guide plate 9 in such a way that a preferably continuous sheet guide surface is formed which is as trouble-free as possible. Blow air openings in the sheet guide element, in particular sheet guide plate 9, can be provided and are not shown. However, in the sheet guide surface of the sheet guide element, in particular of the sheet guide plate 9, Venturi nozzles are preferably provided, preferably blowing to the side. These are particularly preferably arranged on the inlet and / or outlet side with a blowing direction component to the edges of the sheet guide surface. This enables a resulting balanced floating height of the sheets on an air cushion, which lies roughly in the gripper impact path, i.e. the pressure forces of the flow on the sheet represent only a counterpart to its area load, which for a 100 g / m ² sheet, for example, is only 1 Pa and at z. B. be a 28 g / m ² sheet almost 0 Pa. The forces acting on the sheet through the Venturi nozzles are therefore dependent on the flow gap between the sheet guide surface and the sheet. If there is a deviation from the balanced floating height, the force is always directed back to this balanced floating height. The increase in pressure forces below the floating height when the sheet approaches the sheet guiding surface is comparatively higher than the increase in suction forces when the sheet guiding surface is removed from the floating height.

The mechanism of action here is that disturbances are caused by the extreme adhesive forces between the sheet, in particular foil sheet, and the sheet guide cylinder, in particular impression cylinder 5, resulting from the printing pressure. When the sheets are transferred from the sheet guide cylinder, in particular the impression cylinder 5, to the sheet conveying system, in particular the sheet conveying drum 7, the sheet is difficult to detach because the pull-off forces only act tangentially. As the movement progresses, the sheet cuts the sheet conveying drum radius as a secant due to the pull-off forces in the sheet and the resulting "excess" of unwound sheet length allows the sheet adhering to the printing cylinder surface to continue following the printing cylinder 5. This increases the only ones Really detaching radial components of the pull-off force, which was previously only tangentially acting, but these are still low and the sheet continues to follow the printing cylinder surface until the sheet's detachment loop is peeled off by the pneumatically acting forces of the comb plate, in particular without mechanical contact. The air cushion generated by the Venturi nozzles cannot participate in the withdrawal of the sheet from the printing cylinder 5, since the suction potential of the air cushion does not act on the regular sheet path or the balanced floating height.

Furthermore, due to the electrostatic charge, the sheet is attracted to the sheet guide element, in particular sheet guide plate 9, when it is pulled from the sheet guide cylinder, in particular the impression cylinder 5, and would come into contact with it. The existing air cushion of the sheet guide plate 9, as a surface load against the unevenly distributed field forces of the electrostatic charge, could not create an equilibrium and thus not create a state of suspension. There would be areas of intensive contact with the sheet guide plate 9. However, every intensive contact with the sheet guide plate 9 leads to visible scratches in the surface of the sheet, in particular of film sheets, or to smearing, especially on sheets of paper. The above-described special design of the sheet guide element, in particular a sheet guide plate 9, is an effective distance-maintaining measure for the scratch-free or smear-free guiding of sheets, in particular foil sheets, on the sheet guide surface under a sheet conveyor system, in particular the sheet conveyor drum 7, after the removal of the Sheet created by the sheet guide cylinder, in particular the printing cylinder 5. The solution created prevents the sheet, in particular the sheet of film, from coming into contact with the sheet guide element, particularly the sheet guide plate 9, especially with the comb and the following guide surface portions, and thus prevents scratches or smearing.

In the machine 1, a control or an automatic sensor-controlled regulation of one, several or all of the discharge electrodes 12 of a, several or all of the deionization devices 8 of the machine 1 can be provided. For example, individual discharge electrodes 12 or several discharge electrodes 12 of a deionization device 8 or also several or all deionization devices 8 of the machine can be connected to a generator, in particular a high-voltage generator. The setting of the discharge effect can be made by activating the generator. For example, the intensity of the deionization device 8 can be controlled or regulated by measuring technology in such a way that it is possible to control or regulate the discharge adapted to the existing statics on the sheet, in particular the sheet of film. Furthermore, in particular in the case of exchangeable discharge cassettes, these can be arranged at a different point on the machine 1. In particular, such a cassette or deionization device 8 can be used in the turning area. The unloading cassettes can thus be designed to be interchangeable with one another in the machine 1 or be of modular construction.

7 shows a section of a sheet processing machine 1 equipped, for example, for film sheet processing, in particular as described above, with a turning device 3 and with a sheet guide element. The turning device 3 is designed here as a three-drum turning device and contains a transfer drum 15, a storage drum 16 and a turning drum 17. The turning device 3 is preferably arranged between printing units 2 of the machine 1, the transfer drum 15 being a sheet guide cylinder, in particular a printing cylinder 5, of a printing unit 2 directly upstream or the turning drum 17 is a sheet guide cylinder, in particular printing cylinder 5, of the following printing unit 2 is arranged downstream. The printing cylinders 5 are in turn operatively connected to a blanket cylinder 6 and this further to the plate cylinder (not shown) in the printing units 2, as described above. The machine 1 can be switched between the two-sided printing and two-sided printing modes, with sheet conveying without turning by transferring the leading edge of the sheet between the drums in the straight printing mode. The transfer drum 15 and the turning drum 17 of the turning device 3 are, for example, single-sized and the storage drum 16 is designed, for example, double-sized. For sheet conveyance, the transfer drum 15 has a gripper system (not shown), which is arranged in a gripper channel, for clamping the sheets at the leading edge. The sheets are transferred in the gripper connection to a gripper system of the storage drum 16, which is also not shown and is arranged in a gripper channel. The sheets are clamped at the leading edge by the storage drum 16 and fed to the turning drum 17 while the storage drum 16 is rotating. The turning drum 17 contains a gripper system, likewise not shown, for sheet conveyance, in particular grippers and / or suction devices, which are pivotably mounted in the turning drum 17. Alternatively, the turning drum 17 can also contain a pincer gripper system for taking over or conveying the sheets. Other cylinder arrangements or other cylinder sizes can also be used. For example, the transfer drum 15 can also be made twice as large.

In the straight printing operating mode, the sheets are taken over by the gripper system of the turning drum 17 in a transfer center at the front edge of a gripper system of the storage drum 16. When turning a sheet in perfecting, this sheet is guided past the transfer center by the storage drum 16 and grasped at the rear edge by the gripper system of the turning drum 17. This detected sheet is then turned over during the rotation progress of the turning drum 17 according to the principle of the trailing edge, so that its old trailing edge becomes the new leading edge and the old leading edge lying on the storage drum 16 becomes the new trailing edge. The turning device 3 is assigned a sheet guiding element to support sheet guidance, particularly in the perfecting mode. For example, below the storage drum 16 and turning drum 17, a sheet guide element, in particular designed as a sheet guide plate 9, can be used to support the Arch guide be arranged. The sheet guide element, in particular sheet guide plate 9, can also be designed, for example, as a sheet guide element, in particular sheet guide plate 9, which can be displaced depending on the mode of operation. Such a displaceable sheet guide element, in particular sheet guide plate 9, can be fed to the sheet conveying path for sheet guidance at least in the perfecting mode.

The storage drum 16, not shown in detail, can, for example, have format-adjustable jacket segments which, when the format is adjusted, mesh in a comb-like manner and form the arc-bearing jacket surface. The two diametrically arranged gripper systems of the double-sized storage drum 16 for the sheet leading edges are arranged on preferably stationary front shell segments. Fixing systems, in particular suction systems, for example rotary suction devices and / or tension suction devices, for taking over and guiding the sheet trailing edges can be provided on the rear casing segments, which are adjustable with respect to the front casing segments. Rotary suction devices can be used to tighten the sheets while they are being conveyed from the transfer drum 15 to the turning drum 17 lying on the storage drum 16, in particular longitudinally and / or transversely. Even when the turned sheet is withdrawn from the storage drum 16 by the turning drum 17, the sheet can preferably be tightened by the fixing systems, in particular suction systems such as the rotary suction cups or also suction cups in the prongs of the rear adjustable casing segments of the storage drum 16.

To support sheet guidance in perfecting, the sheet guiding element arranged below the storage drum 16 and turning drum 17 can be adjustable so that its sheet guiding surface is aligned at least approximately parallel to the sheet conveying path. The sheet conveying path corresponds at least approximately to a surface which is applied tangentially to both the lateral surface of the storage drum 16 and the turning drum 17. The sheet guide surface of the Sheet guide element, in particular of sheet guide plate 9, can also easily be approximated to turning drum 17. The sheet guide element, in particular the sheet guide plate 9, has a flat guide surface 9.3 at least in some areas, which is particularly preferably located below the turning drum 17, in particular maintaining the axis of rotation of the turning drum 17. A deionization device 8 is assigned to the sheet guide element, in particular the flat guide surface 9.3 of the sheet guide plate 9. The deionization device 8 has at least one discharge electrode 12 for discharging an arc. The deionization device 8, in particular the at least one discharge electrode 12, has the effect that a discharged arc is freed from the effects of electrostatic forces so that it can be smoothed in such a way that it can pass the subsequent printing nip or the printing zone without waves and wrinkles.

8a shows an embodiment of a sheet guide plate 9 of the turning device 3 with an attached discharge electrode 12. The discharge electrode 12 is arranged transversely to the sheet conveying direction BFR, preferably across the machine width and provided with corresponding electrical connections. The discharge electrode 12 is preferably assigned to the flat guide surface 9.3 of the sheet guide plate 9, wherein the flat guide surface 9.3 in the sheet conveying direction BFR can be followed by an area approaching the turning drum 17. At least one fan 14 can preferably be assigned to the sheet guide element, in particular to the sheet guide plate 9, which fan can be controlled in particular to generate blow and / or suction air. Corresponding openings, for example Venturi nozzles, are assigned to the sheet guide element, in particular sheet guide plate 9, facing the sheet conveying path. In particular, suction and / or blown air can be generated by the fan 14 at least in the area of the flat guide surface 9.3 of the sheet guide plate 9. The fan 14 can be provided in the area of the discharge electrode 12 on the opposite side of the sheet guide plate 9. The sheet guide element, in particular the sheet guide plate 9, can also be made in one piece or consist of several parts, with a fan 14 can be assigned to an upstream section arranged largely below the storage drum 16.

FIG. 8b shows an embodiment of a sheet guide plate 9 of the turning device 3 with an integrated deionization device 8. The deionization device 8 can have a cassette, which is particularly exchangeable, and is embedded in the sheet guide plate 9. The deionization device 8 preferably has several discharge electrodes 12, which are arranged at a distance from one another, transversely to the sheet conveying direction BFR, preferably across the machine width. Insulators 11 are preferably positioned between the discharge electrodes 12, which are preferably embedded here, the surfaces of which terminate tangentially on the sheet guide plate 9, in particular as already described above. The sheet guide element, in particular the sheet guide plate 9, can preferably be assigned at least one fan 14 for generating blow and / or suction air, in particular at least in the area of the flat guide surface 9.3, as described above. Furthermore, in the case of the at least one embedded discharge electrode 12, a cover can be provided for producing a largely closed sheet guide surface in the area of the discharge electrode 12. In this case, a cover part (not shown) having openings adapted to one or more discharge electrodes 12 can be assigned to the sheet guide plate 9, in particular directly above the discharge electrode 12 or discharge electrodes 12, in particular as described above. The cover part, not shown, can be designed or arranged as described above.

One of the sheet guide elements described, in particular such a sheet guide plate 9, is assigned to the transfer area between the storage drum 16 and the turning drum 17 in the machine 1. A sheet guide plate 9 in particular limits the long side of the turning area downwards and is arranged at a distance from the cylinder tangent between storage drum 16 and turning drum 17 so that the distance to the sheet corresponds to the optimal electrode spacing corresponds. Furthermore, the fixing systems, in particular suction systems, for example rotary suction devices and / or tensioning suction devices, of the storage drum 16 can fix the sheet lying on the storage drum 16 so that the sheet is also stretched or taut near the cylinder tangent between the storage drum 16 and the turning drum 17 becomes. In particular, this ensures that not only is the optimal electrode spacing maintained over the entire arc length, but the influence can also be carried out on the arc where it remains free of ion-binding contact with machine parts on the top and bottom. This has the advantageous effect that the ions can pass into the activated deionizing ambient air with little hindrance.

9 shows, for example, a section of a sheet processing machine 1, in particular a sheet sheet processing machine 1, for example as described above, with a delivery 4. The machine 1 is accordingly preferably equipped for sheet processing and in particular as a

Foil sheet processing machine performed as already described above. The delivery 4 contains a sheet conveying system, not shown in further detail, which takes the sheets processed in the machine 1, for example printed and / or coated, from the last sheet guide cylinder and conveys or transports them to a delivery stack, not shown. This sheet conveyor system is preferably designed as a chain conveyor system with two display chains, each guided laterally on the frame of the display 4, between which gripper carriages are arranged equally spaced and parallel to one another. The gripper carriages have sheet fixing systems with which the sheets to be conveyed are gripped at the leading edge. The gripper carriages can take over the sheet leading edges from the last sheet guide cylinder of the machine 1 in the gripper connection. The continuously revolving driven and guided gripper carriages in particular have gripper fingers that can be moved against fixed gripper impacts for taking over the sheets, preferably at the front edge from the last sheet guide cylinder of the machine 1. In the delivery 4, the gripper carriages are guided by the delivery chains on a gripper carriage path in the sheet conveying direction BFR to over the delivery stack, where the gripper carriages release the sheets for storage. To release the sheet, the clamped sheet leading edges are loosened by lifting the gripper fingers from the gripper supports, which are fixedly arranged on the gripper carriage. The movement of the gripper fingers can take place via control cams and control levers via a gripper shaft on which the gripper fingers are fixedly arranged. With regard to the sheet conveying direction BFR, a sheet brake is preferably arranged upstream of the delivery stack, which decelerates the sheets to be deposited from machine speed to deposit speed after they have been released. After the delay by the sheet brake, the sheets are aligned with front, rear and / or side edge stops, for example, and are neatly deposited on the delivery stack. The delivery stack is lowered by a stack lift drive during the sheet depositing process in such a way that the delivery stack surface forms an at least approximately constant deposit level for the coming sheets.

On the sheet conveying path to the delivery stack, at least one mechanical sheet guiding element is arranged in the delivery 4 below the sheet conveying path, which guides the sheets after the last sheet guide cylinder on the way to the delivery stack. The endlessly revolving gripper carriages of the chain conveyor system convey the sheets that have been printed on both sides in the machine 1 from the last sheet guide cylinder to the delivery stack. The gripper impacts circulating with the gripper carriage describe a gripper impact path which largely corresponds to the sheet conveying path or limits it on one side and thus defines it. The last sheet guide cylinder of the machine 1 is in particular a printing cylinder 5 of the last printing, coating, drying, inspection or finishing plant, which in particular has an at least approximately closed outer surface. The pressure cylinder 5 is preferably made twice as large and contains two gripper systems arranged diametrically to one another in gripper channels, as already described above. These gripper systems in particular also have movable gripper fingers that correspond to the gripper impacts that limit or define the sheet conveying path. The leading edges of the sheet are taken over from these gripper systems by the gripper carriages of the chain conveyor system in the gripper connection. In order to take over the leading edge of the sheet, the gripper fingers of the printing cylinder 5 are gaped with the gripper fingers of the gripper carriage. This transfer of the sheet leading edge takes place in a transfer center in which the sheet leading edge is briefly fixed by both grippers.

The chain conveyor system in the display 4 has a sprocket shaft arranged adjacent to the last sheet guide cylinder, in particular the impression cylinder 5, with two sprocket wheels 18 arranged coaxially and at a distance from one another, which are firmly connected to the sprocket shaft. The delivery chains run over the sprockets 18 and can be driven in rotation by these. The sprocket shaft can, for example, be driven via the continuous drive gear train together with sheet conveying systems and sheet guide cylinders in the works or printing units 2 of the machine 1. The sheet guide element is arranged below the sprocket shaft between the sprockets 18 and is preferably designed as a sheet guide plate 9 that extends over the width of the machine and is arranged between the side walls. This sheet guide plate 9 preferably has an at least approximately closed surface for the sliding and / or floating guidance of the sheets. The sheet guide plate 9 can be provided with an ink-repellent coating. Furthermore, nozzle openings, in particular Venturi nozzles, can be assigned to the sheet guide plate 9 for the pneumatic guidance of the sheets.

For example, one or more blow boxes or fans 14 can be arranged below the sheet guide plate 9, which can also be formed from assembled partial guide plates, via which blow nozzles of the sheet guide plate 9 with blow air and / or suction air can be supplied so that an air cushion can be formed between the sheet guide plate 9 and the sheets conveyed or transported by the gripper carriage, in particular for perfecting. A smoothing device that can preferably be deactivated can be assigned to the sheet guide element, in particular the sheet guide plate 9. Such a smoothing device can be deactivated or is not used if sheets with fresh color are transported or guided, for example in perfecting or also foil sheets. The sheet guide elements, in particular sheet guide plates 9, of the machine 1 are designed in particular to be identical. In order to prevent the sheets from sticking to the delivery stack, dryers and / or powder devices (not shown further) can be provided in the delivery 4. It is also possible to control or regulate the heating of the sheet guiding element to integrate a coolant circuit in the sheet guiding element.

The sprocket shaft in the display 4 in particular has no jacket surface for carrying the sheets. In a further development, in addition to the chain wheels 18 for the revolving delivery chains, the sprocket shaft can contain two or more support disks or suction disks or also individual suction cups, such as corner suction cups. For example, the support disks with or without corner suction cups or the suction disks can be designed to be axially displaceable on the respective sheet side edges. Such disks can also be adjusted axially automatically and / or independently of one another. Such disks contain, in particular, circumferential support surfaces which have a minimal axial extension. As a result of this extension of the support disks in the axial direction, a respective sheet can be fixed on the lateral surface of the sheet guide cylinder, in particular the printing cylinder 5, when the sheet is taken over. A sheet fall is thus avoided as long as the sheet is between the discs and the last sheet guide cylinder, in particular the printing cylinder 5. The sheets are preferably pressed against the lateral surface of the printing cylinder 5 in small press gaps by support elements arranged on brackets. The support elements can be elastic Have surfaces. Such disks are preferably also made twice as large and can preferably have recesses for the rotating gripper carriages of the chain conveyor system.

Fig. 10 shows a last sheet guide cylinder, in particular printing cylinder 5, of the machine 1 with a downstream chain wheel 18 of the chain wheel shaft and sheet guide element arranged below the chain wheel shaft, in particular a sheet guide plate 9 described above. Between the axis of rotation of the chain wheel 18 and the axis of rotation of the printing cylinder 5 is a Connection line drawn on which the transfer center is located in the transfer area. The sheet guide plate 9 is arranged below the sprocket shaft and has, in particular, metallic comb fingers 10 in the area facing the printing cylinder 5, in particular as already described for the printing unit 2. In the area of the sheet guide cylinder, in particular the printing cylinder 5, the sheet guide plate 9 is preferably further spaced from the axis of rotation of the sprocket shaft or of the chain wheel 18 than the areas of the sheet guide plate 9 adjoining in the sheet conveying direction BFR. The comb fingers 10 can, for example, be spaced a few millimeters apart. for example between 1 and 10 mm, preferably between 2 mm and 3 mm, to the lateral surface of the printing cylinder 5. In particular, the sheet guide plate 9 in the delivery 4 is constructed at least approximately identical to the sheet guide plates 9 in the printing units 2 or units of the machine 1. In this way, the same favorable sheet guiding conditions are preferably ensured in the entire machine 1.

11 shows a sheet guide cylinder, in particular a printing cylinder 5, for example as described above, with a downstream sprocket shaft and a sheet guide element arranged below the sprocket shaft, in particular a sheet guide plate 9, as described above. The sheet guide plate 9 shown in a side view has a cover, in particular containing a non-conductive or non-metallic material described above or made of non-conductive or non-conductive material. non-metallic material existing cover part 13 on. The deionization device 8 can be removed, for example, from the sheet guide element, in particular the sheet guide plate 9. The deionization device 8 can, for example, be removed from below or between the chain wheels 18 of the chain wheel shaft. The deionization device 8 can, for example, be removed from the side and / or by displacing at least a part of the sheet guide plate 9. The cover, in particular the cover part 13, closes the opening required by the deionization device 8. The cover is preferably dimensioned or attachable in such a way that a continuous or almost full-area sheet guide surface of the sheet guide plate 9 is created. The cover part 13 can be designed or arranged as already described above.

How it works: By means of a sheet conveying system in the turning device 3 and / or in a work or printing unit 2, in particular a turning drum 17 or sheet conveying drum 7 or a gripper carriage in the delivery 4, the sheets are transported by a sheet guide cylinder, in particular a storage drum 16 or a Impression cylinder 5, taken over and guided past a deionization device 8 along the sheet guide element, in particular the sheet guide plate 9, on the sheet conveying path. In the area of a transfer drum or a sprocket shaft, a device can be provided which additionally guides the sheet in the vicinity of the gripper impact path in a defined manner only at the edges so that the optimal electrode spacing is maintained over the entire sheet length and the sheet does not prematurely hit the sheet guide plate 9 touches and falls below said optimal electrode distance.

The sheets, in particular sheets of film, are detached from the lateral surface of the sheet guide cylinder, in particular the printing cylinder 5, by the sheet guide element, in particular the sheet guide plate 9, preferably with a spiral shape. In particular, the comb fingers 10 of the separation loop of the sheet give way when it is pulled from the outer surface with a suitable distance. Allowing a minimal pull-off loop advantageously increases the detaching radial portion of the pull-off forces. Due to the arrangement of the Venturi nozzles along the guide contour of the sheet guide element in connection with the associated balanced floating height of the sheets under the gripper impact path, the suction forces of the air cushion can act on the sheet located on the regular sheet path. In this way, the bow is held on the outside of the radius of the gripper impact path and the detachment loop is kept small.

The at least one discharge electrode 12, especially at the start of the guide plate, effects a charge balance on the sheet until it is sufficiently neutral so that the sheet is not attracted as an electrical conductor by the sheet guide element, in particular the sheet guide plate 9. In particular, the deionization device 8 provides positive and negative ions in order to be able to compensate for the changing charge states on the sheet surface. A deionization device 8 is used in particular in each printing unit 2 or unit of the machine 1 because the sheet, in particular the sheet of film, is extremely recharged during each printing process.

In particular, the sheets are optimally discharged by the deionization device 8 of the or each printing unit 2, preferably each unit, the turning device 3 and / or the delivery 4. Unloading makes it possible to feed the sheet to the next conveyor system, for example a printing cylinder 5 or a gripper carriage, in a constantly floating manner without the sheet being scratched by contact with the sheet guide element, in particular a sheet guide plate 9. The one or more discharge electrodes 12 of a respective deionization device 8 ensure, in particular, an active discharge with both positive and negative ions. The generators provided preferably work in a range from 3 to 6 kV, optimally with a high voltage of at least approximately 4.5 kV. The high voltage can also be set depending on the determined electrostatic charge. Through the Deionization devices 8, a respective sheet is discharged, so that the deionized sheets, free from electrostatic forces, are smoothed and placed on the sheet guide plate 9 or the air cushion generated by the sheet guide plate 9. The sheets remain deformation and smear-free over the entire machine 1.

List of the reference symbols used

1 machine

2 printing unit

3 turning device

4 display

5 printing cylinders

6 rubber cylinders

7 sheet conveyor drum

8 Deionization device

9 sheet guide plate

9.1 upstream guide surface section

9.2 downstream guide surface section

9.3 flat guide surface

10 comb fingers

11 isolators

12 discharge electrodes

13 cover part

14 fans

15 transfer drum

16 storage drum

17 turning drum

18 sprocket

BFR sheet conveying direction

Claims

Expectations

1. Sheet processing machine (1) with a turning device (3),

wherein in the turning device (3) sheets can be taken over by a sheet guide cylinder (16) by a sheet conveyor system (17) and can be conveyed in the sheet conveying direction (BFR) on a sheet conveying path, and

a sheet guide element (9) being provided below and / or along the sheet conveying path,

characterized,

that the sheet guiding element (9) is assigned a deionization device (8).

2. Sheet processing machine according to claim 1, wherein the sheet guide element (9) at least partially has a flat guide surface (9.3) and the

Deionization device (8) is arranged in the area of the flat guide surface (9.3).

3. Sheet processing machine according to claim 1 or 2, wherein the sheet guide element (9) is assigned as a sheet guide plate (9) to a transfer area between a storage drum (16) and a turning drum (17).

4. sheet processing machine according to claim 1, 2 or 3, wherein the

Sheet guide element (9) extends at least from a vertical plane intersecting an axis of rotation of a storage drum (16) to a vertical plane which has a transfer area between a turning drum (17) and a

Sheet guide cylinder (5) cuts.

5. sheet processing machine according to claim 1, 2, 3 or 4, wherein the

Deionization device (8) at least one on an in particular plane

Includes the discharge electrode (12) placed on the guide surface (9.3) of the sheet guide element (9).

6. sheet processing machine according to claim 1, 2, 3, 4 or 5, wherein the

Deionization device (8) comprises an in particular exchangeable cassette with at least one discharge electrode (12) embedded in a sheet guide plate (9).

7. sheet processing machine according to claim 1, 2, 3, 4, 5 or 6, wherein the

Deionization device (8) one, two, at least two, three or more spaced apart and / or arranged transversely to the sheet conveying direction (BFR)

Has discharge electrodes (12).

8. sheet processing machine according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the deionization device (8) having sheet guide element (9) as

Sheet guide plate (9) which can be displaced depending on the mode of operation is formed in the turning device (3).

9. sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the deionization device (8) has two, three or more in the sheet conveying direction (BFR) spaced insulators (11) which extend over the Extend the width of the sheet guide element (9) and each have a discharge electrode (12)

lock in.

10. sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the sheet guide element (9) at least one on the side facing away from a guide surface (9.3) arranged fan (14) for generating Has suction and / or blown air at least in the area of the guide surface (9.3).

11. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein the sheet guide element (9) has a plurality of fans (14) for generating suction and / or blowing air.

12. sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, wherein a cover (13) in particular made of non-conductive material to produce a largely closed guide surface (9.3) in the area of

Deionization device (8) is provided.

13. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, wherein a cover (13) having openings adapted to one or more discharge electrodes (12) in particular immediately above the

Deionization device (8) can be assigned to the sheet guide element (9).

14. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or

13, a control or regulating device being provided for adapting the discharge by the deionization device (8) to the electrostatics of the arc (s).

15. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, wherein the turning device (3) has three cooperating sheet guide drums (15, 16, 17 ) with gripper systems.

16. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15, wherein the turning device (3) single-size and / or multiple-size sheet guide drums (15 , 16, 17).

17. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,

14, 15 or 16, wherein the turning device (3) comprises a single-sized or double-sized transfer drum (15), a double-sized or multi-sized storage drum (16) and a single-sized or double-sized turning drum (17).

18. sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 or 17, wherein the machine (1) is a sheet-fed printing machine or a Sheet-fed offset rotary printing machine in aggregate and series design.

19. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 or 18, wherein the machine (1) for processing is designed and / or equipped for printing substrates of low grammage and / or for processing foil sheets.

20. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 or 19, wherein the sheet processing machine (1 ) comprises at least one work (2) and / or a delivery (4), wherein in the work (2) and / or the delivery (4) the sheets by a sheet conveyor system (7, 18) from a

Sheet guiding cylinders (5) can be taken over and conveyed in the sheet conveying direction (BFR) on a sheet conveying path, with a sheet guide cylinder (5) beginning below and along the sheet conveying path in particular

Sheet guiding element (9) is provided and the sheet guiding element (9) in the area of the sheet guiding cylinder (5) is further spaced from an axis of rotation of the associated sheet conveying system (7, 18) than the area of the sheet guiding element (9) adjoining in the sheet conveying direction (BFR).

21. Sheet processing machine according to claim 20, wherein the sheet guide element (9) in the plant (2) and / or the delivery (4) at a distance of 1 mm to 10 mm or 2 mm to 3 mm from a lateral surface of the sheet guide cylinder (5) is arranged starting.

22. Sheet processing machine according to claim 20 or 21, wherein the sheet guide element (9) arranged in the plant (2) and / or the delivery (4) is the

Has sheet guide cylinder (5) facing in particular metallic comb fingers (10).

23 sheet processing machine according to claim 20, 21 or 22, wherein a

Deionization device (8) in the plant (2) and / or the delivery (4) is arranged in an area of the sheet guide element (9) which is further from an axis of rotation of the associated sheet conveying system (7, 18) is spaced apart as an area of the sheet guiding element (9) adjoining in the sheet conveying direction (BFR), the deionization device (8) in particular forming a sheet guiding surface with the sheet guiding element (9).

24. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 or 23, the sheet-processing machine (1) comprising several printing units (2), with printing gaps for printing the sheets being provided in each of the printing units (2), the sheets in each of the printing units (2) being fed by a sheet conveyor system (7) from one Sheet guide cylinder (5) can be taken over and conveyed in the sheet conveying direction (BFR) on a sheet conveying path, wherein in the printing units (2) each below and along the

Sheet conveying path a sheet guiding element (9) is provided and in each with respect to the sheet conveying direction (BFR) the first printing nip of the machine (1) downstream printing unit (2) the respective sheet guiding element (9) with a

Deionization device (8) is equipped.

25. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 or 24, whereby the machine (1) has one or more further coating, drying, inspection and / or finishing units and all coating, drying, inspection and / or finishing units of the machine (1) deionization devices (8) containing sheet guide elements (9).

26. Sheet processing machine according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 or 25, with deionization devices (8) in some or all plants (2), a display (4) and / or the turning device (3) each having at least one exchangeable cassette embedded in a sheet guide plate (9) with at least one discharge electrode ( 12) include and / or are identical and / or interchangeable.

27. A method for conveying sheets in a sheet processing machine (1), in particular in a turning device (3) of a sheet processing machine (1), in particular according to one of the preceding claims,

wherein sheets by a sheet conveyor system (7, 17, 18) from a

Sheet guiding cylinders (5, 16) are taken over and conveyed in the sheet conveying direction (BFR) on a sheet conveying path along a sheet guiding element (9), the sheets being guided by the sheet guiding element (9),

wherein the sheets are assigned to one of the sheet guide element (9)

Deionization device (8) are passed and

the deionization device (8) providing positive and negative ions in order to avoid the changing charge states on the

Level the surface of the arch.

28. The method according to claim 27, wherein the sheets are guided by the sheet guide element (9) without contact and / or pneumatically.

29. The method of claim 27 or 28, wherein the sheets on one or both

Curved edges held or guided on the deionization device (8)

be led past.

30. The method of claim 27, 28 or 29, wherein the sheets of grippers of

revolving or rotating sheet conveying systems (7, 17, 18) held past the deionization device (8).

31. The method of claim 27, 28, 29 or 30, wherein the sheets in a

Turning device (3) of three sheet conveying drums (15, 16, 17) gripped on sheet edges are conveyed.

32. The method of claim 27, 28, 29, 30 or 31, wherein the sheets in a

Turning device (3) from a single-sized or double-sized transfer drum (15), a double-sized or multiple-sized storage drum (16) and a single-sized or double-sized turning drum (17) are conveyed.

33. The method of claim 27, 28, 29, 30, 31 or 32, wherein the sheets in a

Turning device (3) in a perfecting operating mode on an at least regionally planar deionization device (8)

Guide surface (9.3) of the sheet guide element (9) are passed.

34. The method according to claim 27, 28, 29, 30, 31, 32 or 33, wherein the sheets in a perfecting mode in a turning device (3) by a

Turning drum (17) gripped on the new front edge and guided along a sheet guide plate (9), while the new rear edge is still on the outer surface of an upstream storage drum (16).

35. The method of claim 34, wherein the sheets in the beautiful and

Reverse pressure at the new rear edge on a lateral surface of the upstream storage drum (16) can be held by fixing systems of the storage drum (16).

36. The method according to claim 27, 28, 29, 30, 31, 32, 33, 34 or 35, wherein a control or regulating device is used to adapt the discharge by one or more deionization devices (8) to the electrostatics of a respective one or a plurality provided by arch.

37. The method according to claim 27, 28, 29, 30, 31, 32, 33, 34, 35 or 36, wherein in

Depending on the current order, a cover (13) with or without openings is used to produce a sheet guide surface on the deionization device (8).

38. The method according to claim 27, 28, 29, 30, 31, 32, 33, 34, 35, 36 or 37, wherein the machine (1) processes or prints substrates of low grammage and / or foil sheets.

39. The method according to claim 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 or 38, wherein the sheets in a plant (2) and / or a delivery (4) of the machine (1 ) taken over by a sheet conveying system (7, 18) from a sheet guide cylinder (5) and conveyed in the sheet conveying direction (BFR) on a sheet conveying path, the sheets being controlled by a sheet guiding element (9) beginning below and along the sheet conveying path, especially in the area of the sheet guiding cylinder (5) ), whereby the sheets are first guided by a sheet guide surface of the sheet guide element (9) further spaced from the axis of rotation of the sheet conveyor system (7, 18) and then by a sheet guide surface of the sheet guide element arranged closer to the axis of rotation of the sheet conveyor system (7, 18) (9).

40. The method of claim 39, wherein the sheet is first from one of the

Axis of rotation of the sheet conveyor system (7, 18) steadily approaching

Sheet guide surface and then from a sheet guide surface of the arranged concentrically to the axis of rotation of the sheet conveyor system (7, 18)

Sheet guide element (9) are guided.

41. The method according to claim 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 or 40, wherein the sheets in at least one plant (2) and / or a delivery (4th ) the machine (1) by a sheet conveyor system (7, 18) taken over by a sheet guide cylinder (5) and conveyed in the sheet conveying direction (BFR) on a sheet conveying path, the sheets by a below and along the

Sheet conveying path arranged sheet guide element (9) are guided, the sheets first on a deionization device (8) having

Sheet guide surface of the sheet guide element (9) are guided, which continues from an axis of rotation of the associated sheet conveyor system (7, 18) is spaced apart as a sheet guide surface of the sheet guide element (9) adjoining it in the sheet conveying direction (BFR).

42. The method according to claim 39, 40 or 41, wherein the sheet by in particular

pneumatically acting and / or metallic comb fingers (10) of the sheet guide element (9) beginning in the area of the sheet guide cylinder (5) from the

The outer surface of the sheet guide cylinder (5) can be peeled off and guided to one or the deionization device (8).

43. The method according to claim 39, 40, 41 or 42, wherein the sheet after one or the deionization device (8) concentric to the axis of rotation of the

Sheet conveyor system (7, 18) are guided to a downstream sheet guide cylinder (5).

44. The method according to claim 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42 or 43, wherein the sheets in several printing units (2) and / or a delivery (4) of the machine (1), the sheets in the printing units (2) being printed in printing columns, the sheets in the printing units (2) and / or the delivery (4) each being carried by a sheet conveying system ( 7, 18) from one

Sheet guide cylinder (5) taken over and conveyed in sheet conveying direction (BFR) on a sheet conveying path, the sheets in the printing units (2) and / or the delivery (4) each beginning below and along the sheet conveying path in the area of the sheet guiding cylinder (5) Sheet guide element (9) are guided and wherein the sheets are guided past a deionization device (8) after each printing nip in the printing units (2) and / or the delivery (4).

45. Use of a deionization device (8) containing

Sheet guide element (9) in a sheet processing machine (1), in particular a turning device (3) of a sheet processing machine (1), wherein a Guide surface (9.1, 9.2, 9.3) of the deionization device (8) containing sheet guide element (9) more than 10 mm from the sheet conveying path of a

Sheet guide cylinder (5, 16) and one immediately downstream

Sheet conveyor system (7, 17, 18) is arranged at a distance.

46. Use according to claim 45, wherein the deionization device (8) provides positive and negative ions in order to compensate for the changing charge states on the arc surface.

47. Use according to claim 45 or 46, wherein a deionization device (8) having sheet guide plate (9) from a gripper impacts a

Sheet conveyor drum (7) or a delivery chain circle (18) or from one

Cylinder tangent is arranged on a storage drum (16) and a turning drum (17) formed sheet conveying path at a distance of 20 mm to 50 mm or 25 mm to 30 mm.

48. Use according to claim 45, 46 or 47, wherein a sheet guide plate (9) having a guide surface (9.1, 9.2, 9.3) is used for the pneumatic contactless guiding of the sheets.

49. Use according to claim 45, 46, 47 or 48, wherein a guide surface (9.1, 9.2, 9.3) of the sheet guide element (9) containing the deionization device (8) is arranged more than 15 mm, 20 mm or 25 mm from the sheet conveying path.

50. Use of a deionization device (8) containing

Sheet guide element (9), in particular according to claim 45, 46, 47, 48 or 49, in all printing units (2) and one delivery (4) or in all printing units (2), one

Turning device (3) and a delivery (4) of a sheet-fed printing machine,

in particular a sheet-fed offset printing machine in aggregate and series construction.