Sheet processing machine with one processing unit and one delivery

Abstract

Sheet processing machine with a processing unit and a delivery, wherein a sheet guiding cylinder (3) cooperates with a leading edge gripper system (4) arranged in the delivery for transporting sheets at the leading edge to a delivery stack, wherein a sheet transfer system (2) is arranged between a cylinder (1) of the last processing unit and the sheet guiding cylinder (3) and is optionally designed to create differently equipped sheet processing machines of a modular system, wherein, in an embodiment of the machine having a coating unit, the sheet transfer system (2) is designed as a sheet guiding device having sheet carrying segments (8) and wherein the sheet support segments (8) are designed to be laterally adjustable outside the maximum sheet format.

Description

The invention relates to a sheet-processing machine having a processing unit and a delivery unit.DE 100 14 417 A1 discloses a device for transporting a sheet for a rotary printing press, in which the sheets are transferred in one embodiment from a sheet guide drum having sheet supports to a cylinder arranged in a delivery device. This enables the arrangement of the sheet guiding drum directly after the printing cylinder of a last coating unit. A disadvantage of this solution is that it is only required in the case of a limited number of machine designs. Other machine designs are unnecessarily made more expensive by this sheet guiding concept.DE 10 2007 051 634 A1 discloses a sheet-fed rotary printing press having printing units for printing sheets and a delivery arm containing a collecting cylinder and a discontinuously drivable, revolving sheet conveying system.EP 2 380 740 A1 shows a processing machine with a boom for sheet material.The object of the invention is therefore to further improve the sheet transport in a sheet processing machine.According to the invention, the object is achieved by a device having the features of the independent device claim. Advantageous embodiments are evident from the dependent claims, the description and the drawings.The invention has the advantage that the sheet transport in the delivery of a sheet processing machine is further improved.The invention is not directed to the use of modular construction on printing machines, which is already known by the aggregate construction on printing machines. The invention is intended to focus on the provision of differently equipped sheet processing machines of a modular system by selective use of a single sheet transfer system. In this case, a uniform sheet transport concept is ensured for all the fittings of a sheet-processing machine. At the same time, only the investment in the machine necessary for all requirements of a particular machine equipment is always provided.Accordingly, at least one substructure module with a receptacle of the last processing unit accommodating different sheet transfer systems is preferably provided. In one embodiment, part of the modular system is a transfer drum with jacket segments and a sheet guide device having only sheet support segments. These sheet transfer systems can be used particularly preferably in perfecting and perfecting machines. In a further embodiment, a transferer and a transfer drum with jacket segments and / or a sheet guiding device having only sheet supporting segments are part of the modular system.Advantageously, by minimal differences of sheet guide elements, an optimum sheet guidance is achieved in all the equipment variants of sheet processing machines according to the same sheet guidance concept. This enables a maximum high component repetition and thus reduces the costs required. The sub-components and the receptacle enable an optimally adapted sheet guidance with any specific machine equipment. Moreover, a change-over capability is achieved with changed machine equipment.In a first variant of the machine as a perfecting press, a transferer for gripping and guiding only the front edge of the sheets is to be arranged in the receptacle. As a development, a sheet guide plate can be assigned to the transferer for supporting sheet guidance. This machine may also include one or more coating units. A smear-free sheet guidance in the region of the transfer device is ensured here on account of the non-printed rear side of the sheet.In a second variant of the machine, which is a perfecting press without a last coating unit, a transfer drum with shell segments is to be arranged in the receptacle. The sheets are placed on these shell segments during transport. The transfer drum can also have an approximately closed lateral surface and / or be provided with a coating. As a development, a sheet guide plate can be assigned to the transfer drum in order to support sheet guidance. Smearing of the freshly printed sheets is prevented by defined guiding of the sheets around the shell segments of the transfer drum.In a third variant of the machine, which is a perfecting press with the last varnishing unit, a sheet guide device having sheet-carrying segments is to be arranged in the receptacle. These sheet support segments are preferably designed as sheet supports which can be adjusted to the respective sheet edge and which hold the sheets only at these non-printed sheet edges. Particularly preferably, these sheet-carrying segments are designed as suction segments which hold a sheet while being guided in a suction-like manner. A smear-free sheet guidance of the sheet freshly printed or painted both on the front side and on the rear side is ensured here by the fixing of the sheet only at the sheet edges.As a development, the machine in the third equipment variant can be assigned a sheet guide plate which can further support the sheet guidance. In the case of selected orders, sheet guidance without the sheet support segments can thus also take place only at the front edge by the sheet guidance device and by the sheet guide plate analogously to the first equipment variant. The sheet support segments can preferably be set from the sheet format for these orders.The sheet transfer system selected according to the equipment of the machine is inserted or converted into a receptacle which is otherwise unchanged. This modularity reduces cost and increases flexibility. Other components of the machine are otherwise the same and unchanged. The sheets can be guided in the delivery along an ascending branch, but are preferably transported horizontally from the sheet guide cylinder to the delivery stack. Particularly preferably, the sheet transport takes place, in addition to the front edge, also at the rear edge from the sheet guide cylinder to the delivery stack.The invention is to be explained below by way of example. The accompanying drawings illustrate schematically: FIG. 1 : Section of a sheet-fed printing press equipped as a perfecting printing press with a transfer device in front of the cylinder arranged in the delivery; FIG. 2 : Section of a sheet-fed printing press equipped as a perfecting and perfecting press with a transfer drum between a printing cylinder of a last printing unit and the cylinder arranged in the delivery; FIG. 3 : Section of a sheet-fed printing press equipped as a perfecting and reprinter with suction discs between a printing cylinder of a last varnishing unit and the cylinder arranged in the delivery.FIG. 1 shows a section of a sheet-processing machine, here a sheet-fed printing press, with an output device. The printing press can be, for example, a sheet-fed offset rotary printing press of aggregate and series construction and can contain elements, not shown in more detail, such as feeders, installation, a plurality of printing and optionally coating units, finishing units and / or drying units. In the machine, sheets to be printed are conveyed by cylinders and transferred between the cylinders in a gripper closure. The sheets are thus transported to the delivery in a clamped manner at the front edge. In the delivery, the sheets are taken over by conveying systems with continuously revolving gripper systems and are conveyed fixed at the front edge and the rear edge as far as a stack support plate, not shown in any more detail. Above the stack support plate, the sheets are released to form a delivery stack. The stack support plate is vertically lowered by a lifting drive depending on the incoming sheets.The printing machine is preferably of modular construction, wherein a substructure module of the last processing unit of the machine illustrated here accommodates a printing cylinder 1 and a sheet transfer system 2 arranged downstream thereof. The printing cylinder 1 has an approximately closed lateral surface. After the printing cylinder 1 of the last printing or varnishing unit, the sheets are transferred from the sheet transfer system 2 to a sheet guide cylinder 3 arranged downstream. The machine shown here is designed in a piece of equipment as a perfection printing machine, for which reason the sheet transfer system 2 is designed as a transferer 6 between the printing cylinder 1 of the last processing unit and the sheet guide cylinder 3.The sheet guide cylinder 3 arranged downstream of the transfer device 6 is mounted here in a last modified substructure module of the machine. Alternatively, an enlarged substructure module of the last processing unit can be used or the sheet guide cylinder 3 can be accommodated in the delivery frame. The axis of rotation of the sheet guiding cylinder 3 may be located in a plane with axes of rotation of cylinders in the works of the machine or above such a plane. As a development, the sheet guide cylinder 3 can be designed as a storage drum and / or can cooperate with additional devices. Examples of additional devices are inspection systems, powdering devices, ink jet and other marking systems, cutting, embossing and ionizing devices, counting devices, numbering devices, cold foil devices and dryers or sheet discharge devices, which can be assigned to the sheet guide cylinder 3 in standardized interfaces.All the rotary sheet conveying systems shown are designed here as double-sized systems, which each contain two diametrically arranged gripper systems for fixing the front edges of the sheets for sheet transport. Alternatively, however, the sheet conveying systems can also be of single or multiple size, wherein a single-size system can accommodate at least one sheet of maximum format on the circumferential side.By means of the transfer device 6 used in this perfecting press, the sheets are taken over at the front edge by the upstream printing cylinder 1 and transferred to the downstream sheet-guiding cylinder 3. Smearing phenomena do not occur because of the non-printed rear side of the sheet. As further illustrated here, the sheet transport can be supported by a pneumatically acted upon sheet guide plate.The delivery system shown here contains a leading edge gripper system 4 interacting with the sheet guide cylinder 3 and arranged directly downstream of the latter and having circumferentially guidable gripper systems for sheet leading edges, and a trailing edge gripper system 5 having circumferentially guidable gripper systems for sheet trailing edges for accepting and conveying the sheets from the sheet guide cylinder 3 to the sheet stack. The leading edge gripper system 4 is designed here as a chain conveying system with peripherally guided leading edge gripper carriages and the trailing edge gripper system 5 as a chain conveying system with peripherally guided trailing edge gripper carriages. The chains of both chain conveying systems are driven or guided by sprockets and / or chain deflection guides. The sprockets can be arranged concentrically or eccentrically offset with respect to one another.For sheet transport, the leading edge gripper carriages contain gripper systems for fixing the sheet leading edges, which are preferably designed as clamping grippers. The clamping grippers have fixed gripper impacts which interact with gripper fingers arranged on gripper shafts for fixing the sheet leading edges. The trailing edge gripper carriages contain gripper systems for fixing the sheet trailing edges. These gripper systems can be designed as suction systems and / or clamping gripper systems. The trailing edge gripper carriages are designed to be format-adjustable with respect to the leading edge gripper carriages. By means of the front edge gripper carriages, the sheets are taken over approximately at the upper surface line of the sheet guide cylinder 3 in the gripper closure. The sheets are also taken over by the trailing edge gripper carriages by the sheet guide cylinder 3. Alternatively, the rear edges can also be gripped at a distance from the lateral surface of the sheet guiding cylinder 3 or on the path of the sheets to the sheet stack by the rear edge gripper carriages. In this case, the sheets can also be temporarily stabilized or fixed by transfer systems, not shown.Both the leading edge gripper system 4 and the trailing edge gripper system 5 are arranged above a horizontal plane, which is tangent to the upper surface line of the sheet guide cylinder 3, for the transport of the sheets from the sheet guide cylinder 3 to the sheet stack. In the preferred embodiment shown here, the sheet transport through the chain conveyor systems takes place exclusively on a horizontal sheet conveying path from the sheet guide cylinder 3 in the sheet running direction BLR to over the sheet stack, which substantially simplifies the sheet guidance. The horizontal sheet transport path allows the gripper carriages to be supported from the outside in the deflection regions. As a result, the stresses and deformations occurring due to centrifugal forces can be reduced, which enables the use of relatively small deflection radii and / or the use of low gripper carriage heights. Lower gripper carriage heights allow a smaller and thus substantially more effective dryer spacing. On the sheet conveying path to the sheet stack, additional devices, not shown, such as dryers, powdering devices, derollers, etc., can be arranged, which act on the sheets during sheet transport.The sheets fixed by the leading edge gripper carriages at the leading edge and by the trailing edge gripper carriages at the trailing edge are released for deposition over the sheet stack and are deposited on leading edge stops. For delaying the sheets, a depositing system, not shown in any more detail, can be arranged, which can be designed as a post-gripper for gripping a sheet edge or as a pneumatic sheet brake. Preferably, however, the depositing system is designed as a gripper gripper, which accepts the rear edge of the sheet from the respective rear edge gripper carriage in the gripper closure, decelerates it and deposits it on the delivery stack. Print-free corridors are not necessary in this case.FIG. 2 shows a detail of a sheet-fed printing press in the form of a perfecting and perfecting press. The machine is largely structurally identical to the machine described above, for which reason similar reference numerals have been assigned. In addition, the machine includes a non-illustrated reversing device for reversing the sheets for a reverse printing. The turning means may be a one-drum turn or a three-drum turn for a trailing edge turn. The machine can also have dryers, not shown here.The last processing unit of the machine is here a printing unit which transfers printing ink to the sheet conveyed by the printing cylinder 1. The last processing unit is not a lacquer unit, in particular a dispersion lacquer unit, since an undried lacquer film transferred to the sheet would lead to signs of smearing. Processing units arranged upstream could, however, be designed as coating units. The sheet transfer system 2 arranged between the impression cylinder 1 of the last processing unit and the sheet guide cylinder 3 arranged in the delivery device is designed here as a transfer drum 7. The transfer drum 7 contains at least jacket segments for carrying the sheets to be transported. The transfer drum 7 here contains pivotable sheet supporting surfaces for the flat guiding of the sheets. As a development, a cover can be arranged on the transfer drum 7. As the coating, for example, a replaceable basket or drum caps can be used.By means of the transfer drum 7 with jacket segments used in this perfecting and reprinting printing machine, the sheets are taken over at the front edge by the upstream printing cylinder 1 and transferred to the downstream sheet guide cylinder 3, the sheet printed on the front and rear sides being carried securely and smear-free by the jacket segments. The printing ink applied in the last printing unit is dried to such an extent that no smearing phenomena occur on the shell segments. As further illustrated here, the sheet transport can be supported by a pneumatically acted upon sheet guide plate.FIG. 3 shows, in one embodiment of the invention, a section of a sheet-fed printing press equipped as a perfecting and perfecting printing press with a final processing unit designed as a varnishing unit, in particular a dispersion varnishing unit. From the last coating unit, a coating film is transferred to the sheet guided by the printing cylinder 1, which is not transferred, completely dried, from the sheet transfer system 2 to the sheet guide cylinder 3. For this purpose, the sheet transfer system 2 is designed as a sheet guiding device having sheet supporting segments for sheet transport. The sheet support segments are designed to be axially adjustable and only contact the print-free sheet edge. The sheet support segments can transport the sheet pressing against the lateral surfaces of the impression cylinder 1 and / or sheet guide cylinder 3 and / or hold the sheet in a suction-like manner. Alternatively or additionally, the sheet edges could also be held on the sheet support segments by means of revolving gripper fingers or rollers set on.The sheet supporting elements of the sheet guiding device are preferably individually designed to be axially adjustable, so that they can be set asymmetrically in terms of width. The sheet support segments are preferably automatically displaceable, but can alternatively or additionally be moved manually. Furthermore, these sheet-carrying segments can be adjusted outside the sheet format, so that sheet transport through the sheet-guiding device can optionally take place without sheet-carrying segments. In further developments, an additional rear edge guide element, which can be adjusted to the sheet rear edges, is provided for guiding the sheet rear edges. The trailing edge guide element rotating with the sheet support segments could be a suction gripper or a pressing element. The sheet trailing edges can be gripped by suction grippers during the entire revolution, while stiff sheet trailing edges protruding with the pressing elements or with guide shields are advantageously pressed against the downstream sheet guide cylinder 3 during the sheet transfer. The trailing edge guide element is, however, preferably designed as a suction strip.In the embodiment shown here, the sheet supporting segments are designed as suction discs 8 between the printing cylinder 1 of the last coating unit and the sheet guide cylinder 3 arranged in the delivery. These suction disks 8 have a small axial extent and preferably consist of sucking segments which can be connected and disconnected depending on the angular position, for example via a rotary slide valve. As a development, the suction chambers of the suction segments can be set down individually. This enables the transport of even smaller formats without drawing false air. The vacuum generation is preferably effected by ejectors directly on site from applied compressed air. These ejectors can be switched mechanically or via electromechanical valves. A compressed air supply for ejectors requires smaller line cross sections than a direct suction air supply for the suction discs 8.The suction discs 8 are preferably placed on the non-printing side edges of the sheets. When the sheets are removed from the last impression cylinder 1, they are gripped at the front edge by known grippers of the sheet guiding device, wound onto the aforementioned suction discs 8 and securely guided by their suction effect. In addition to the suction disks 8 mentioned, the use of additional suction and / or support elements is conceivable, which can be set as required.In a development of the invention, which is not illustrated, an additional sheet guiding element, such as a sheet guiding plate, which can be pneumatically acted upon is arranged, which assists the sheet guidance of the sheets guided by the sheet supporting segments. Furthermore, when the sheet-carrying segments are shut down, sheet guidance can be effected on this sheet-guiding element.List of the reference numerals used1 Impression cylinder 2 Sheet transfer system 3 Sheet guide cylinder 4 Leading edge gripper system 5 Trailing edge gripper system 6 Transferer 7 Transfer drum 8 Suction discs BLR Sheet running direction

Claims

Sheet-processing machine having a processing unit and a delivery unit, wherein a sheet-guiding cylinder (3) interacts with a leading-edge gripper system (4) arranged in the delivery unit for transporting sheets at the leading edge to form a delivery stack, wherein a sheet transfer system (2) which is designed selectively for creating differently equipped sheet-processing machines of a modular system is arranged between a cylinder (1) of the last processing unit and the sheet-guiding cylinder (3), wherein, in an embodiment of the machine having a coating unit, the sheet transfer system (2) is designed as a sheet-guiding device having sheet-carrying segments (8), and wherein the sheet-carrying segments (8) are designed so as to be adjustable laterally outside the maximum sheet format.Sheet-processing machine according to Claim 1, characterized in that the sheet-carrying segments (8) are designed to be axially adjustable independently of one another.Sheet-processing machine according to Claim 1 or 2, characterized in that the sheet-carrying segments (8) are designed to be axially adjustable manually.Sheet-processing machine according to Claim 1, 2 or 3, characterized in that the sheet-carrying segments (8) are designed as axially adjustable suction discs (8).Sheet-processing machine according to at least one of the preceding claims, characterized in that a sheet guide plate is assigned to the sheet transfer system (2).Sheet-processing machine according to at least one of the preceding claims, characterized in that the sheet transfer system (2) is assigned a pneumatically actuatable sheet guide plate.

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