ES2505327T3 - Device for transporting a sheet - Google Patents

Abstract

Device for transporting a sheet by means of tweezers (1, 1A-1D) and a first means of transport in the form of a tape (3A-7A, 3B-7B), for the movement of at least a first clip (1, 1A-1D), in which case a second means of transport (3A-7A, 3B-7B) is assigned for the movement of a second clamp (1, 1A-1D), characterized in that, each of the means of transport (3A-7A, 3B-7B) has its own and fixed propulsion on site, in which case a speed profile is individually assigned to each means of transport (3A-7A, 3B-7B) by means of the variable control of the thrusters fixed at the site, in which case the clamps (1) are joined on both sides through the connecting elements (8) with the means of transport assigned to each.

Description

DESCRIPTION

Device for transporting a sheet.

The present invention relates to a device for transporting a sheet in sheet processing machines, according to the general terms of claim 1.

State of the art

For the state of the art, reference is made to JP61174058A, which has a device for transporting 10 paper. As indicated, the DIN-A-3 and DIN-A-4 sheets are transported at the same time. In addition, the DE 198 19 490 C1, in which a system for transporting sheets is described, consisting of a first sheet transport system and a second sheet transport system, among which a roller is placed transfer. Finally, GB 589 389 A is indicated, which also has a sheet transport system. fifteen

For the transport of sheets, in the case of machines used for sheet processing, the following principles are known:

Principle 1: Most current offset sheet printing machines have rollers that drive the sheets, which have at least one mechanical or pneumatic grip system for securing the sheet at the leading edge of the sheet. The gripping system generally consists of numerous individual pliers or grips that are placed along a line of gripping glue parallel to the axis of rotation of the roller. The grippers of the grip system act together with the tweezers of the adjacent roller, such that they deliver the blade between them so that they comb the bow from roller to roller. In this case, the transport of the sheet through the machine takes place in an undulating manner, that is, that the sheet constantly receives curvatures of alternate directions. Some typical examples of these sheet transport systems can be found in numerous patents of the companies 25 Heidelberger Druckmaschinen, König & Bauer AG or Manroland AG.

The disadvantages of this sheet transport system have to do with the high precision requirements of sheet transport, with the high costs of the rollers that transport the sheets and with the fact that, for the sheet that leaves a position When the feeding table is at rest, the speed of the machine must be accelerated over a short distance by means of previous clamps and, if necessary, by means of an input drum. Inside the sheet machine, the sheet will be driven at a constant speed during sheet transport while the process is underway.

This explains why these sheet transport systems are of such high accuracy but also why they are so expensive. In addition, the corrugated type transport has the disadvantage that, in the case of rigid printing materials being used, the sheet must be held on top of the roller by mechanical and / or pneumatic supports 35 during the sheet transport process , in order to prevent it from rising too much due to the curvature and, consequently, the surface to be printed is struck and damaged. Pneumatic clamping means, such as cylindrical pressure and blowing devices, require a constant supply of air. In addition to the investment costs for equipment of this type, maintenance costs are constantly generated. Very rigid printing materials, such as glass, metal from a certain thickness, or thick corrugated cardboard, are excluded from the process due to the transport of corrugated sheets. Apart from the high precision and decades of experience with this type of sheet transport systems there is nothing else in favor of its use, but quite the opposite, because due to the high costs, the sheet transport system cannot be applied in equipment in which the expense is critical.

Principle 2: Another principle already known is the vacuum transport system, in which case the sheet is fixed by vacuum 45 on a transport system. The transport of the sheet takes place, in this case, by means of suction or suction cups or suction boxes, which are equipped with rollers. Sheet conduction systems of this type can be found in DE 6960048 “Verarbeitungssystem für Pappe mit Vakuumtransportsystem” (Cardboard processing system with a vacuum transport system) and in DE 69807547 “Vorrichtung zum Transportieren von plattenförmigen Gegenständen in Rotationsdruckmaschinen ”(Device for the transport of 50 artifacts in the form of plates inside rotary companies). Against transport systems of this type, he speaks in the first place that in the case of printing procedures with great pressure impact, after a distance of transport, and with the use of fine paper and cardboard, these cannot be conducted through the printing slot of the printing group, because the suction openings would be stamped into the fine material. That is why this transport principle can only be used for very rigid materials or in transport areas 55 of the printing equipment, such as at the feeding table, in which case the sheet will not be exposed to large loads of Pressure. As indicated in the text of patent CH 638 116 or CH 648 772, a conveyor belt can be combined with a roller printing group. However, this construction has the disadvantage that, in the transition zone between the conveyor belt and the roller, the sheet is not driven so

defined. That is why equipment of this type is only used in production areas where the accuracy of registration is not especially necessary, such as when lacquering the entire surface.

Principle 3: The principle of driving the sheet is that the sheet transport device has flexible and mobile transport devices, which are stretched on both sides in the longitudinal direction of the printing machine and that in the transport devices carriages carrying clamps or bars bearing 5 clamps are fixed, which take the sheet with its clamps, at least on its front edge, and drag it along the entire printing machine or at least a part thereof. An example according to this type of printing machine is represented in DE 1 930 317, in US 2 138 405, in DE 39 36 345 and in US 3 853 315.

In this case, the transport devices that are placed along the printing machine can be straps, ropes or chain lines. In the case of a transport with continuous transport devices of this type, the 10 which transport the sheet from the placement in the printing equipment to its deposit after the printing group, represent a disadvantage, on the one hand, the inaccuracies of the transport of the sheet due to flexibility, manufacturing tolerance and system extensions with negative effects for adjustment accuracy and print quality. Printing with precision of adjustment can only be achieved by determining the position of the sheet during transport and by correcting the application unit. Such a complex control circuit 15 is presented in DE 10 2004 050 725, among others.

Another disadvantage of these sheet transport systems is that the shocks that are the result, for example, of the starting of the pliers carriage in a pliers opening curve, propagate to the interior of the printing group through the transport device. Alterations in printing and registration of deviations are a consequence in the case of critical printing reasons. twenty

The chains, in their role of transport devices, also have the disadvantage that the polygonal errors and the length tolerances of the lines of the chain do not allow a constant travel of the leaf. That is why in the printing industry only this transport system is available in very limited areas. In the case of modern printing machines, transport systems such as this are used only in the non-critical output area of a printing machine. 25

In DE 20 2005 015009 U1 typical clamp trucks are presented for the application of a delivery unit in sheet printing machines. Although also in this case of application these systems have the disadvantage that they circulate with the same distance from each other, which means that during their movement they cannot vary their speed. In the tray area of a rotary sheet printing machine, in which case the transported sheet will be released from the clamp carriage clamps and placed on the tray stack, the sheet does not brake during the transport phase 30 through the transport system. In the case that the systems could be controlled independently, the sheets would be braked thanks to the system and would be placed gently on top of the stack. Due to the constant speed of circulation, brakes do not use brakes that pick up the blade pneumatically and brake it. The deceleration of the contact speed can lead to alterations in the printing, such as the smearing of the newly printed frame or damage of the material to be printed. 35

Principle 4: the desire to control the sheet transport systems individually, in order to adapt each of them to the transport and processing situations, led relatively quickly to the idea of joining the clamps or the clamp trucks with Linear motors individually adjustable. DE 25 01 963 shows a pincer carriage that will be driven by means of a linear motor through a printing machine to the printing machine tray. Other executions of these sheet transport systems with linear motors with their corresponding 40 regulation systems are presented in DE 20 2007 012 355 U1, in DE 10 2008 021 317, in DE 101 55 033 and in DE 10 2004 050 725. The advantages of sheet transport units that can be operated individually are evident.

Despite the literature of current patents on the subject of sheet transport with linear transport systems, no current facilities or research results are known. The main reason for this is the high costs of the linear thrusters, which are caused by the costs of the linear thrusters themselves and the high efforts required for control and regulation technology. Due to the competitive situation that currently exists in the printing industry, in most cases this increase in costs cannot be justified. In addition, sheet transport systems, propelled with linear motors, always present the danger that, in the event of a loss of operation, synchronization with other moving parts is lost, such as with 50 rotary rollers of the printing machine . The resulting danger of collision has to be avoided by means of the corresponding precautions, in order to avoid the destruction of the machine or parts thereof. In DE 101 55 033 an expensive synchronization device of this type is presented between the sheet conveyor and the roller for linearly propelled sheet conveyors. The necessary safety requirements for synchronization devices increase the cost of leaf conveyors with linear motors additionally. 55

Principle 5: DE 10 2006 043 053 A1 presents another principle of driving carriage sheets of individually propelled calipers. Each motor carriage is assigned a motor that propels the carriage carriage individually and independently with respect to the other carriages. The disadvantage of the solution found is, among others, that the clamp trucks have to be built with great stability, since they have to support the motor and, if necessary, a part of the control electronics. In addition, the power supply for the motor must be guaranteed for the entire circuit path. This can be achieved by means of faulty sliding contacts, contactless energy transmission or accumulators. The energy transmission devices necessary for this substantially increase the cost of the entire system and partly also make it more susceptible to errors.

In addition, to ensure that the chains are lightened, the clamp cars roll laterally on top of the guide rails or rest in some other way that is considered adequate. Applications of this type of support mechanisms 10 to lighten the means of transport are known, among others, from CH 391 739 and DE 195 25 635.

Toothed belt joints with clamp devices together with printing technology processing machines are presented in DE 28 49 273, DE 27 24 979, DE 36 05 534, DD 292 428 and DE 100 05 323.

Objective of the invention.

 fifteen

The aim of the invention is to create a sheet transport device with an individual control of the clamp trolleys, which can be carried out with low costs and, however, allow an individual speed profile throughout the circuit for each of the Caliper trolleys or for groups of caliper trolleys through a printing technique processing machine.

 twenty

Goal Solution

The achievement of the objective, according to the present invention, is achieved by means of a device with the characteristics of claim 1. The following claims provide useful improvements.

The invention has the advantage that each clamp or clip carriage or gripping device can be controlled individually with low costs and effectively.

The invention is suitable for application in a printing technique processing machine with sheet transport. In this case, the transport of sheets can take place along the entire route of the printing technique processing machine, or only in parts thereof, by means of the sheet transport system according to the invention. Within the framework of the present invention, the printing technique processing machines are printing machines (offset printing machines, flexography, gravure printing, screen printing, or embossing machines, or combination machines), lacquering machines, stamping, hot stamping, cold stamping, punching machines or folding machines. But the processing machine can also be a machine that contains any combination of the processes described above.

The sheet conveyor is formed in such a way that each clamp carriage / clamp device or at least two groups of clamp trolleys of the sheet transport system are equipped with the corresponding means of transport, and run through drive wheels , placed at the end, assigned to the means of transport individually, and in which case at least one of the driving wheels has a propeller that can be controlled individually.

The means of transport individually assigned to the calipers or to the carriage of calipers / groups of carriages of calipers or to the caliper 40, to the caliper device / group of caliper devices can be a chain of links, a rope or a tape, however The preferred embodiment is a toothed belt. Today's toothed belts can be designed to be very resistant to deformation through the insertion of technical fibers, through the insertion of metals and through the selection of suitable technical materials. They are very suitable for this application, due to its smooth running, the elimination of the polygon effect of the chain and the drag connection with the 45 driving wheels and if necessary other support wheels. The connection with a clamp device or with a clamp carriage with a toothed belt according to the state of the technology can be perfectly resolved.

Due to the fact that each drive wheel is assigned its own propeller, the means of transport can be impressed and with it the calipers, or the group of calipers, thereby connecting an individual speed profile.

By means of this type of sheet transport, for example, great savings can be achieved with regard to the construction of machinery and control technology with respect to solutions with linear propulsion or calipers with their own propulsion through motors , in which case the advantages of the technical procedure resulting from the individual control of some tweezers or groups of tweezers are maintained.

The devices according to the invention are used in different machines, such as sheet conveyors, and by way of example, but without constituting a limitation, as part of a printing machine, a stabbing machine, a stamping machine, a lacquering machine or a machine that is a combination of the other machines.

The location, position or load status of the clamp will be partially controlled for the entire duration of the journey, and the accumulated data will be corrected, adapted or varied by a computer program. In this case, special emphasis is placed on correction values. This process can also be controlled manually through a control panel. The correction takes place by way of example, by means of the correction of an oblique position through the adaptation and / or increase of the speed of a means of transport.

The position of a clamp or the attached blade is determined with at least one sensor. By means of the data obtained by means of the sensor, adjustment signals are obtained for the correction of the position. These results are transmitted to the control device and through the impeller assigned to the means of transport and fixed there, the position is corrected by varying the transport speed.

In particular, position and load status data are collected just before entering a processing station and corrected accordingly, in order to achieve, for example, an optimal printing result. That is why the idea of the present invention contemplates, for example, not processing leafless clamps 15 within the processing station. Similarly, the idea of the present invention contemplates the passage of the leaves by slowing the clamp and accelerating the next clamp.

In addition, the device can be made in such a way that it picks up a sheet in the rest position of a feeding table and accelerates it until it reaches the speed of the machine.

Description of the figures 20

These and other features of the invention result from the description of preferred examples of execution, in which case the forms of execution represented are not to be considered as limiting examples. Reference is made in the following drawings to examples of execution of the invention:

- Figure 1: a plan view on a section of the sheet transport device according to the invention; 25

- Figure 2: a cross-sectional view in the form of a sheet transport system of a printing machine for example sheet processing;

- Figure 3: a delivery unit of a sheet printing machine.

The plan view of Figure 1 shows a section of a sheet transport system according to the invention. Each of the pliers (1), schematically represented, which are shown here without individual clamps, are connected to the corresponding individual transport means (3A-7A, 3B-7B) assigned to the clamp (1). In this case, the means of transport (3A-7A, 3B-7B) can be ropes, ribbons and / or in a preferred case, timing belts. Each of the means of transport (3A-7A, 3B-7B) presents in this case a propeller of its own and located in a fixed way, which is assigned in the appropriate way to one of the planetary gears (not shown here) assigned to the corresponding means of transport. In this way it is possible to print to each of the means of transport (3A-7A, 35 3B-7B) an own speed profile (V3A-V7A, V3B-V7B) individually by means of a control differentiated by the propellers. with fixed location. In this case, the clamps (1) are preferably joined, but not necessarily, on both sides and on the outside through the connecting elements (8) with the transport means (3A-7A, 3B-7B) assigned to each one. By means of the placement on both sides they can be printed a different speed (V3A <> V3B), as can be seen in the case of the example of the means of transport (3A, 3B). 40

This has the advantage that the clamp (1) can be placed in an oblique position, in order, for example, to compensate for the oblique position of a sheet within the clamping elements of the clamp (1), before input of the processing station (for example a printing group, a lacquering group or a stamping group) of the printing techniques processing machine. This compensation can be part of a control circuit, with which, for example, the position of the blade within the clamp fasteners (1) is detected by means of one or several sensors and, in the case from a wrong position in the transport direction, said wrong position is compensated by varying the speed of the corresponding pair of transport means (for example 3A / 3B).

In this way, the individual wrong positions in the direction of the circumference and / or the oblique positions can be compensated without great effort in regard to the type of technological machinery. Poor registrations and registration failures at the different processing stations, and therefore also the waste (waste) are reduced and the quality of the process is increased.

In a preferred embodiment, the clamps (1) run on raceways (2A, 2B) mounted laterally, for example on the side walls of the machine. The raceways (2A, 2B) have the function of ensuring that the means of transport (3A-7A, 3B-7B) generate exclusively the forces for the forward movement and thus be safe from other loads. The clamps (1) can have, in this case, laterally mounted rolling rollers, which are positioned below or above the rolling rail (2A, 2B). This has the advantage of 5 that the load of the transport means (3A-7A, 3B-7B) will be reduced effectively, which allows to reduce the wear of the transport means (3A-7A, 3B-7B).

In another example of a special embodiment, one of the rolling rollers that runs below or above the raceway (2A, 2B) is a gearwheel that runs above the toothed side of the raceway (2A, 2B). In this way, the precision of the transport of the sheet can be further increased and thus also the accuracy of the positioning. Naturally, the clamp (1) can also have a single rolling roller laterally, which runs inside a cage formed by a guide rail positioned below and above the rolling roller.

Figure 2 type sketch shows schematically and only by way of example the advantages that result from the solution found according to the invention for the transport of a sheet inside a sheet processing machine with printing techniques. Each of the sheets will be collected by a marker (8) with a suction head 15 or suction cup (9) from a marker stack (4) and accelerated. The sheets will then be transported over a feeding table (10) to the equipment (which has not been represented here) and there, generally, will be oriented laterally with an inclined entrance.

In the Offset sheet printing machines, in this case a larger adjustment of the front edge is made, so that the sheet is driven against stops, which are positioned transversely across the entire width of the machine. In this case, the blade positions are given in the resting position of the sheet. After the orientation process of the blade, the blade is accelerated from the rest position through a complex pre-clamp and, generally, a marker drum until it reaches the speed of the machine.

In the exemplary embodiment of Figure 2, the sheet can be placed on the clamp (1) with a speed V0 (see the speed diagram shown below) directly, renouncing a pre-clamp and a marker drum, and together with the clamp (1) can be accelerated to the machine's VD speed. With this speed VD the sheet is then transported through the processing station, or the processing stations, represented here by a pressure roller (12) and a counterpressure roller (13), with an almost constant VD speed. That is why thanks to the fact that the sheet is in its transport, from the initial placement to the processing station, held by a carriage of tweezers, deliveries from a system of tweezers 30 are avoided (as for example in the case of an Offset sheet printing machine from a pre-caliper, through the marker nozzle to the rollers that drive the sheets), which reduce the quality and are complex from the point of view of the machinery. This leads together with the increase in quality, by reducing variation, to a significant reduction in mechanical engineering expenses.

Another advantage is the union of the different clamps (1) or groups of carriages of clamps with a means of transport (3A-35 7A, 3B-7B) assigned to them individually. From the state of the art (see State of the art, Principle 3) it is known to fix all the clamp carriages in laterally rotatable transport systems, for example in systems with chains. Apart from the fact that all clamp trucks then have the same speed throughout the circuit, this transport system is only suitable under certain conditions for transport through a printing or lacquering group. Within a printing group, for example, layer thicknesses of 40 micrometers are applied which react very sensitively to changes during the transport of the sheets.

In the case of clamp trucks that are fixed, according to the state of the art, in a circulating transport system, the vibrations, which can be generated, for example, by opening a clamp during the reception of the sheets in the placement zone can be propagated along the sheet transport system to the printing area and at that point cause technical alterations of the printing, such as stripes in the printed or lacquered box. However, in the case according to the invention, the clamp (1) or the group of clamps is connected to a transport means (3A-7A, 3B-7B) assigned to it individually. In this way there is a decoupling of the different systems. A jolt when opening a clamp, for example, which can be generated in a clamp (1) coupled with a transport means (3A, 3B), can also be propagated along the transport means (3A, 3B), but it will not have any technological consequence of printing since the clamp carriage system (1), which is connected to the transport means (4A, 4B), is thus decoupled from the transport means (3A, 3B) . The great disadvantage of the transport of sheets with rotating carriages is the propagation of alterations along the means of transport.

This disadvantage is solved by the solution according to the invention, that is, by decoupling the different clamps or groups of clamps. In this way, alterations in printing techniques are effectively avoided.

Figure 3 shows the application of the solution according to the invention in a delivery unit (14) of a sheet printing machine. From the last roller that drives a sheet of the sheet printing machine, the sheet is delivered to a rotating sheet transport system with pinch trucks (1A-1D) and, from this, it is transported to an area of the unit delivery (14), from where it is placed on top of the output stack (19).

With this example it should be noted that it is also useful to join the groups of clamp carriages (1A-1D) with a means of transport assigned to each group individually. Each of the groups (1A-1D) can then be printed with their own speed profile.

The system of rotating calipers of a delivery unit (14) takes place, in this case and as a rule, around two re-sending drums (16, 17), to which re-sending chains are assigned (16.17) individual assigned to clamp groups (1A-1D) that have a propulsion. Because the requirements for driving 10 of a sheet in a delivery unit (14) are not very high, the propulsion of the return chains (16, 17) for a group of caliper carriages (1A-1D) can take place on both sides by means of a drive unit. Propulsion on the opposite side can be done by means of an axle or a transmission.

The individual control of a caliper carriage or a group of caliper carriages (1A-1D) has the technical advantage for processing, that the sheets can be transported through a drying device, usually placed within a unit delivery of a sheet printing machine, for example a thermal or ultraviolet (UV) dryer, with a slowed speed with respect to the operating speed of the sheet printing machine. In this way, thanks to the increased application time, the drying efficiency can be increased.

It may also be useful to transport the sheets with the clamps (1) in the placement area (18) of the delivery unit 20 (14) at a reduced speed.

In general, in sheet printing machines known today all clamp systems travel in a delivery unit (14) with identical speed. This means that the sheets have to be released from the clamps (1) in the placement zone (18) by means of the opening of the clamps (1), so that they can be placed on top of the outlet stack (19). In this case, at the beginning, the blades still have the transport speed of the blades after release 25 and have to be braked, for example, by means of brake devices that act pneumatically. These braking devices are expensive and can cause stains and thus waste (debris) in the case of sheets printed on both sides, since they act directly on the sheet. With the solution found according to the invention, the clamp system or the group of clamps (1A-1D) can be slowed down in the placement zone (18) and, thus also, the sheet carried by the clamps (1), so that it can be placed on top of the output battery (19) at a reduced speed, smoothly and without damage. Braking devices can be made more easily or can even be avoided.

The example of the application of the solution according to the invention in a delivery unit of a sheet processing machine makes it possible to suggest that it may be useful to form groups of clamp systems in which each is connected to a transport means assigned to the group. The first group of clamps (1D) in the transport direction, for example, has to take the speed of the previously placed machine since the delivery of the sheet from the roller of the machine carrying the sheet has to occur in a synchronized way

However, the second group of tweezers (1A) travels at a reduced speed in order to allow smooth and undamaged placement of the blades on top of the output stack (19). The systems (1B, 1C) are assigned to the upper part of the rotating leaf transport system that travels back, an area in which no transport of leaves no longer takes place. Its speed can be freely chosen effectively. By grouping the clamps into groups of clamps, which take different speeds at different times, efforts and costs can be reduced in terms of construction and propulsion technology, without losing the advantages of procedure due to the presence of different speed profiles during the tour.

This principle of driving the sheet according to the invention can be applied in all variations of the delivery units 45 of machines that process sheets and is not limited for application in sheet printing machines.

By means of the solution found according to the invention, the construction of the machine can be simplified, the costs reduced and the quality of the processing technique increased. The transport of the sheet by means of a sheet processing machine can then take place, along the entire route or only in some parts thereof, through machines that process sheets with the process according to the invention. fifty

List of reference numbers

 one

 Caliper / grip 34 67

 2

 Rolling rail 35 68

 3

 Means of transport 36 69

 4

 Means of transport 37 70

 5

 Means of transport 38 71

 6

 Means of transport 39 72

 7

 Means of transport 40 73

 8

 Support 41 74

 9

 Suction head / suction cup 42 75

 10

 Feeding table 43 76

 eleven

 Swivel sheet transport system 44 77

 12

 Pressure roller 45 78

 13

 Back pressure roller 46 79

 14

 Delivery Unit 47

 fifteen

 Means of transport 48

 16

 Forward Drums (Forwarding Wheels) 49

 17

 Forwarding Drums (Forwarding Wheels) 50

 18

 Placement area 51 E

 19

 Output battery 52

 twenty

    53

 twenty-one

    54

 22

    55

 2. 3

    56

 24

    57

 25

    58

 26

    59

 27

    60

 28

    61

 29

    62

 30

    63

 31

    64

 32

    65

 33

    66

Claims (13)

1. Device for the transport of a sheet by means of tweezers (1, 1A-1D) and a first means of transport in the form of a tape (3A-7A, 3B-7B), for the movement of at least a first clip ( 1, 1A-1D), in which case a second means of transport (3A-7A, 3B-7B) is assigned for the movement of a second clamp (1, 1A-1D), characterized in that, 5 each of the means of transport (3A-7A, 3B-7B) has its own and fixed propulsion at the site, in which case each profile is individually assigned to a transport profile (3A-7A, 3B-7B) of speed by means of the variable control of the propellants fixed in the site, in which case the clamps (1) are joined on both sides through the connecting elements (8) with the means of transport assigned to each one.  10 2. Device according to claim 1, characterized in that at least one clip (1, 1A to 1D) is assigned to each means of transport (3A to 7A, 3B to 7B, 15). 3. Device according to claim 1 or 2, characterized in that each means of transport (3A to 7A, 3B to 7B, 15) is propelled independently of one another. fifteen 4. Device according to claim 1 or 3, characterized in that the clamp (1, 1A to 1D) is driven in part or rotationally along a raceway (2A, 2B). Device according to claim 4, characterized in that the caliper (1, 1A to 1D) is driven through a roller or a wheel or a cogwheel on top of a corresponding rolling rail (2A, 2B). 6. Device according to claim 1 to 5, characterized in that at least one support (8) is assigned to each clamp (1, 1A to 1D).  25 7. Device according to at least one of claims 1 to 6, characterized in that the transport means (3A to 7A, 3B to 7B, 15) include a toothed belt, a rope, a belt and / or a chain of links . Device according to at least one of claims 1 to 7, characterized in that the clamp (1, 1A to 30 1D) can be rotatably displaced. Device according to at least one of claims 1 to 8, characterized in that the means of transport (3A to 7A, 3B to 7B, 15) is propelled by means of return chains (16, 17).  35 10. Device according to at least one of claims 1 to 9, characterized in that a sheet can be led to a clamp (1, 1A to 1D) by means of a feeding / loading table or the like. Device according to at least one of claims 1 to 10, characterized in that it is part of a delivery unit of a rotary printing press for sheets. 40 12. Device according to at least one of claims 1 to 11, characterized in that a sheet can be driven to, through and away from at least one processing station. 13. Device according to claim 12, characterized in that the processing station can be, for example, a printing group or a punching group.