DE102017218413A1 - A sheet transporting apparatus and method for transporting sheets from a sheet guiding cylinder to a sheet conveying system - Google Patents

Abstract

The invention relates to a sheet transport device for a sheet-processing machine with a sheet of a sheet guiding cylinder (2) receiving sheet conveying system (3, 4), with a gripping device (3) for clamping fixing and transporting a respective sheet leading edge and at least two at the same time on the cylinder surface the sheet support cylinder (2) holding circulating arc support segments (6), wherein the sheet support segments (6) supporting the bow exclusively supporting or pressing against the cylinder surface supporting elements (7) and wherein pneumatic fixing means (10) are provided for the sheet trailing edge, and a method for The invention is based on the object to provide an alternative sheet transport device and an alternative method for sheet transport. In particular, a sheet transfer from a sheet guiding cylinder to a downstream sheet conveying system is to be further improved. According to the invention, the object is achieved in that at least one sheet supporting segment (6) and a fixing device (10) are mounted so as to be displaceable transversely to the sheet conveying direction (BFR).

Description

The invention relates to a sheet transport device for a sheet-processing machine with a sheet from a sheet guiding cylinder receiving sheet conveying system and a method for transporting sheets from a sheet guiding cylinder to a sheet conveying system in a sheet processing machine.

From DT 2 025 849, DE 73 03 778 U and DE 28 13 136 A1 It is known to assign bow guide cylinders additional arch support elements that contact the arch only partially. The disadvantage is that the drums are solid and therefore dynamically unfavorable. Next, the adjustment effort is great.

Out US 2,965,026 , DT 1 761 714, DT 2 002 877, DT 25 18 334 B1 and GB 2 256 426 A It is known to form support disks of sheet guiding drums with adjustable contact elements. The disadvantage is that the adjustment effort is large and not rationally feasible for rapid job change to sheet-processing machines.

Out DE 35 35 621 A1 and DE 196 44 011 A1 It is known to relocate planar arch support segments on chains to below the periphery of bow guide drums. The disadvantage is that these sheet guiding drums are not suitable for the sheet transport of freshly painted sheets in the delivery of a sheet-processing machine.

Out DE 10 2004 031 171 A1 and already DE 517 004 It is known to remove bow by adjustable on pressure-free side edges suction discs from a cylinder jacket surface. The vacuum required to hold the sheet edges is generated by a pump and transmitted via a rotary valve on the sprocket main shaft. The rotary valve takes over the timing of the suction air. The disadvantage is that this rotary valve usually works without contact and very large amounts of leakage air are drawn. Furthermore, high demands are placed on the rigidity of the assembly, since even the slightest deformation leads to a change in the gap between the rotor and the stator, as a result of which the leakage losses become unacceptable or result in unwanted contact and thus heavy wear. Thus, high demands are placed on the adjustment during assembly due to the desired minimum gap widths in conjunction with the need to exclude a touch. Although there is the possibility not to perform the rotary valve contactless, but this is associated with a high wear of the mutually rubbing components, especially in the charged with powder delivery. A further disadvantage is the fact that the rotary valve and the point of action (sucker) are not immediately adjacent to each other, which leads to quite long suction lines, which must be evacuated at each clock. Especially with high-speed machines with cycle times of 180 ms and below, these systems are threatening to become sluggish. Another disadvantage is that the suction discs must have an axial extent due to design, requiring relatively large pressure-free side edges. This reduces the usable arch area.

Out DE 10 2005 002 509 A1 . DE 10 2013 224 489 A1 and DE 10 2015 204 113 A1 It is known to press the sheet mechanically or pneumatically against support disks of the delivery drum after a transfer centers. The disadvantage is that a mechanical or pneumatic support must be adjusted consuming. For a secure hold of the bow, a certain axial extension of the support disks is required.

Out DE 100 14 417 A1 . DE 10 2004 051 323 A1 . DE 10 2004 052 656 A1 . DE 10 2011 012 808 A1 and DE 10 2004 009 703 A1 It is known to take bow by a support discs exhibiting delivery drum of a printing cylinder. The sheet trailing edge is held by an over the maximum format width reaching, suction cups having traverse. The disadvantage is that the traverse to take over the sheet trailing edge is large and thus dynamically unfavorable. The traverse reduces the available arch area and high leakage losses occur.

The invention has for its object to provide an alternative sheet transport device and an alternative method for sheet transport. In particular, a sheet transfer from a sheet guiding cylinder to a downstream sheet conveying system should be further improved.

According to the invention the object is achieved by a device having the features of the independent device claim and a method having the features of the independent method claim. Advantageous embodiments will become apparent from the dependent claims, the description and the drawings.

The invention has the advantage that an alternative sheet transport device and an alternative method for sheet transport are provided. In particular, a sheet transfer from a sheet guiding cylinder to a downstream sheet conveying system is further improved.

A sheet transport device can within a sheet-processing machine, such as a sheet-fed press, or in a Display of a sheet-processing machine, such as a sheet-fed press can be used. A sheet conveying system can be designed, for example, as a sheet guiding drum and, in particular, can be arranged between two printing cylinders of a sheet-fed printing press. Accordingly, a sheet-processing machine, in particular a sheet-fed printing machine, with a corresponding sheet transport device is also provided. Preferably, the sheet conveying system includes a delivery drum, which is used in particular in the delivery of a sheet-processing machine. In this case, the delivery drum particularly preferably contains a sprocket shaft in order to move the gripping devices, in particular gripper carriages of a chain conveyor system, to take over sheet leading edges.

For example, when printing on sheet-fed presses even in pressure-free areas small amounts of color are transferred from the plate on the blanket cylinder on the printing cylinder. In places where no sheet rests on the printing cylinder, these small amounts of ink remain on the printing cylinder, where they can build up over a long time. In washing processes, these can also be larger quantities. Sheet support segments that are constantly in contact with the impression cylinder will become dirty over time. This also applies to the back of the sheet support segments when not printing straight maximum size. It is therefore advantageous to format the support elements or contact elements which come into contact with a sheet in the region of a sheet guiding drum or delivery drum.

Preferably, suction takes place exclusively at the sheet trailing edge or at the rear corners. Thus, the lateral sheet support segments or support elements can be made very narrow, which in turn leads to advantageous very narrow pressure-free side edges. For example, the sheet support segments may be formed in the space between gripper carriage as a bracket or bracket to which a traction means, in particular a chain is guided, which is at least partially occupied by preferably elastic support elements, preferably such that these elements only in Area of the lateral sheet edges between gripper carriage and fixing devices, in particular suckers, are. When adjusting a fixing device, in particular a nipple, on the correct arc length, the traction means, in particular the chain, preferably adjusted with. Thus, when moving to a smaller format length, the excess support members can be advantageously "stored" in a region where they are not in contact with the sheet. Advantageously, the support element are used only at the points where there is still a substrate, in particular paper, between these support elements and the cylinder surface. The support elements are thus protected against contamination.

Preferably, the support elements contact only substrate material and never the dirty printing cylinder surface of a printing cylinder of a sheet-fed press. The entire device is thus much less susceptible to dirt and thus low maintenance. In the case of exclusively supporting arch support segments, the possibility of using particularly narrow support elements particularly preferably results, it being shown that a preferably pneumatic fixing of the arch at the lateral sheet trailing edges or at the rear corners is sufficient. In particular, the sheet which is fixed or held on the cylinder jacket surface from the front edge to the trailing edge can easily be taken over by fixing devices arranged adjacent to the sheet support segments.

In particular, the sheet support segments, in particular support elements, have the function to press the sheet to the sheet guiding cylinder, in particular a printing cylinder, thereby preventing a "bow fall". On the other hand, on its way around the sheet guiding drum or delivery drum, in particular a sprocket shaft, the sheet can be supported on these sheet support segments, in particular support elements, and held close to sheet guide plates on the desired path, so that the sheet can not describe a secant.

Particularly preferably, each sheet is detected at its trailing edge in a transfer center by fixing devices, in particular pneumatic suckers, which are preferably arranged exclusively in the region of the lateral sheet support segments. The vacuum required for suction is preferably generated "locally" by means of fixing devices operating according to the ejector principle. In particular, compressed air is preferably unactuated via a rotary input of a rotatably mounted shaft of sheet guiding drum or delivery drum, in particular a rotary feed a Kettenradwelle transferred. Near the effective locations of the fixing devices, in particular at the corner corners, there is, for example, a respective solenoid valve, preferably a quick-acting valve, which is connected via a shortest possible line to a vacuum ejector. This sits as close to the sucker or is integrated into the Saugerbaugruppe to keep the evacuated dead volume as low as possible. Advantageously, this leakage losses are reduced or avoided, resulting in a lower energy consumption (although the vacuum generation by compressed air is actually more energy intensive than a generation by a pump). Further advantageous are the omission the complex assembly of the rotary valve and the provision of a practically wear-free solution. Low dead volumes after the solenoid valve in both the pressure and in the suction line, a highly dynamic behavior can be achieved. Further advantageously, the closing and / or stopping times can be set or changed depending on the sheet speed and / or printing material, for example, via the machine software.

For example, the sheets can be transferred from a rotating sheet guiding cylinder to a peripheral gripping means, in particular gripper carriages, and a delivery conveyor having Bogenfördersystem. The delivery drum of the sheet conveying system has preferably adjacent to the sheet guiding cylinder arranged circumferentially, in particular rotating, driven sheet support segments, which in particular have recesses for the gripper carriage. The sheet support segments form with the cylinder jacket surface of the upstream sheet guiding cylinder a transfer center, in which the gripper carriage take over the sheet leading edges in the gripper closure of gripper systems of the sheet guiding cylinder. The arch support segments have, in particular, a small axial extent relative to the cylinder width. Furthermore, pneumatic means can also be provided which press the sheets onto the cylinder jacket surface and / or which hold the sheets after the transfer centers on the sheet support segments or press against the sheet support segments.

For example, the sheets can be pressed by exactly two sheet support segments simultaneously in the transfer centers against the lateral surface of the upstream sheet guiding cylinder. Below the arch support segments can be arranged a sheet guide, which preferably extends far with a comb element in the area of the transfer centers, preferably in the sheet guide Stützblasbohrungen are arranged. Preferably, the Stützblasbohrungen in the central region of the sheet guiding element over the machine width in a high density and in the adjacent areas, in particular in the sheet conveying direction upstream and / or downstream areas, be arranged in a relation to the central region lower density. The blowing air of the sheet guiding element could also be varied or clocked or controlled according to the progress of sheet transfer or controlled according to sensor values. Particularly preferably, a sheet transport can be provided from a sheet guiding cylinder of a last work to a sheet conveying system in the delivery of a sheet-processing machine, wherein a sheet guiding element can be provided below the delivery drum.

• 1: Auslage einer bogenverarbeitenden Maschine mit einer Kettenradwelle;
• 2: Perspektivische Darstellung der Kettenradwelle mit verstellbaren Bogenstützsegmenten;
• 3: Perspektivische Darstellung der Kettenradwelle mit Stützelemente tragenden Bogenstützsegmenten und Fixiereinrichtungen für die Bogenhinterkante;
• 4: Seitliche Ansicht der doppeltgroßen Kettenradwelle mit an Ketten angeordneten Andrückelementen;
• 5: Vergrößerte Ansicht eines Bogenstützsegmentes mit Andrückelementen und einem Sauger für die Bogenhinterkante;
• 6: Ausführung eines Andrückelementes für eine auf einem Bügel geführte Kette;
• 7: Ausführung eines Kontaktelementes als Sauger für eine Fixiereinrichtung.

In the following, the invention will be explained by way of example. The accompanying drawings show schematically:

• 1 : Display of a sheet-processing machine with a sprocket shaft;
• 2 : Perspective view of the sprocket shaft with adjustable bow support segments;
• 3 : Perspective representation of the sprocket shaft with supporting elements supporting arch support segments and fixing devices for the sheet trailing edge;
• 4 : Lateral view of the double-sized sprocket shaft with pressure elements arranged on chains;
• 5 : Enlarged view of a sheet support segment with pressure elements and a suction device for the sheet trailing edge;
• 6 : Execution of a pressure element for a guided on a strap chain;
• 7 : Execution of a contact element as a sucker for a fixing device.

The 1 shows, for example, a display 1 a sheet-processing machine, in particular a sheet-fed printing press, especially a sheet-fed rotary printing machine preferably in aggregate and series construction. The machine is operated according to preferred in the offset method, with other printing methods such. B. screen printing, can be integrated in the machine. In the works of the machine, not shown, the sheets are gripped by gripper systems of rotating cylinders at the front edge and transferred between the cylinders in the gripper closure. In printing units, the sheets are dyed in an appropriate manner in a print nip formed by a cylinder and a blanket cylinder, each with one printing ink. Further, one or more coating units can be provided, in which the sheets can be painted by a paint form cylinder. The cylinders arranged in the machine can be of single or multiple size, wherein a single-sized cylinder can accommodate at least one sheet and a double-sized cylinder at least two sheets of maximum size circumferentially. The machine is preferably associated with a turning device for turning the sheet in a mode perfecting during machine operation. Next can also processing facilities or processing plants, such. B. cold foil works, be integrated in the machine.

In particular, the machine has a drive wheel, which drives particularly preferably as a continuous drive wheel train at least the sheet guiding cylinder of the machine. Preferably, sheet transfer cylinders designed as transfer drums or transfer cylinders are also driven by the drive wheel train. For this purpose, the sheet guiding cylinders on the drive side of the machine each have intermeshing gears, which form the drive wheel train. The drive wheel train is driven by at least one main drive motor which drives at least one entry point into the drive wheel train. Rubber cylinders of the printing units are preferably also driven by the drive wheel train. Further rotating bodies or rolls of the machine or of the printing units can also be driven at least temporarily by the drive wheel train, wherein these can also be designed to be coupled to the drive wheel train.

Plate cylinders of printing units can also be assigned to individual drives, in particular direct drives. Direct drives are in particular individual drives whose rotors are mounted in alignment and concentric preferably directly to the associated cylinders. During printing, the plate cylinder in question is then tracked electronically synchronized with the rubber cylinder, which is preferably driven by the main drive motor via the drive wheel train. For the plate cylinder and / or blanket cylinder may be assigned a rotary encoder, which may be connected to a control unit of the printing unit and / or the machine control. Alternatively, the drive of the plate cylinder or can also be done via the drive wheel train from the main drive motor.

A control device of the machine, for example, the machine control, is preferably the current machine angle known. The machine angle can be defined as the position of a cylinder in space. For example, the machine angle can be derived or absorbed by the main drive motor. Alternatively, or additionally, a rotary encoder, in particular a rotary encoder, may be associated with a preferably rotating element of the machine, which feeds rotary encoder signals to the control device, in particular the machine control, or provides them for this. For example, a sheet guiding cylinder of the machine, in particular a sheet guiding cylinder according to a turning device not shown and / or a sheet guiding cylinder of a last work, a rotary encoder, preferably designed as a rotary encoder, be assigned. The rotary encoder can in particular the last immediately before the delivery 1 arranged sheet guide cylinder associated with the machine and / or be connected to the control device and / or with a quality control device, for example with an inspection system.

From a sheet-processing machine, such as sheet-fed printing machine, a last here is double-sized sheet guiding cylinder and a sheet of this receiving sheet delivery system of the delivery 1 shown. The sheet guiding cylinder has an at least approximately closed cylinder jacket surface and is here in particular a printing cylinder 2 a last printing unit. Alternatively, the sheet guiding cylinder may also be a last cylinder in a paint or other processing plant. The printing cylinder 2 here is double-sized and contains two diametrically arranged gripper systems located in gripper channels. From these gripper systems, the sheet leading edges are clamped for sheet transport and thus fixed. Alternatively, however, the sheet guiding cylinder can also be simple, triple or multi-sized.

In the delivery 1 Furthermore, the sheet conveying system is arranged, which in particular has endlessly driven peripherally driven and guided gripping devices for the acquisition and transport of the sheet. The gripping devices are preferably arranged on traction means and driven endlessly circumferentially via wheels and / or on deflection guides. The gripping devices are arranged in particular parallel to each other and evenly spaced between the traction means and preferably designed as a clamping gripper. The sheet conveying system here has in particular a chain conveyor system 3 with circumferentially guided gripper carriage and a sheet guiding cylinder, in particular the impression cylinder 2 adjacent sprocket shaft 4 on. The chain conveyor system 3 contains here in particular on both sides of the frame of the display 1 Guided on chain guide rails guide chains, where and between which the gripper carriage are attached. Each gripper carriage contains a clamping gripper system which, for example, has grippers fixedly arranged on a movable gripper shaft and fixed gripper clutches. About a rotation of the gripper shaft, a gripping movement for fixing a respective sheet leading edge can be controlled. Preferably via roller lever and cam rollers, the gripper shaft of a gripper carriage can be actuated in particular in the field of sheet transfer and in the sheet storage of cams.

Of the gripper carriages of the chain conveyor system 3 The sheets are from the sheet guiding cylinder, in particular impression cylinder 2 , taken over and along a Bogenförderweges in Bogenförderrichtung BFR to a delivery pile 5 guided. Preferably, via the roller lever and cam rollers, the gripping movements of the gripper carriage, in particular in the field of sheet transfer in the transfer centers to the sheet guiding cylinder, in particular impression cylinder 2 , and in the field of Sheet storage, especially above the delivery pile 5 , controlled by cams. Particularly preferably, the sheet transport takes place in the delivery 1 exclusively at the sheet leading edge by the gripping means, in particular the gripper carriage. On the sheet conveying path from the sheet guiding cylinder, in particular impression cylinder 2 , to the delivery pile 5 The sheets are preferably guided on guide elements, not shown, for example, sheet guide plates, wherein between the sheet and the sheet guide plates and an air cushion can be formed. In particular, in the operating mode perfecting a contact-free sheet transport can take place. For example, one or more dryers and / or dusting devices may be provided on the sheet conveying path.

In the delivery 1 is the delivery pile 5 in sheet conveying direction BFR Preferably, a sheet brake upstream, which takes over the sheets to be deposited by the gripper carriage and delayed after their release of machine speed to storage speed. After being decelerated by the sheet brake, the sheets are aligned with leading edge stops, trailing edge stops and / or side edge stops, not shown, and clean on the delivery stack 5 stored. The delivery pile 5 is preferably lowered by a Stapelhubantrieb not shown during the sheet deposition process such that the delivery stack surface forms an at least approximately constant storage level for the upcoming bow. The sheet brake, for example, contain at least two braking stations, which preferably axially, ie transversely to the sheet conveying direction BFR , displaceable, in particular displaceable, are arranged. The braking stations are placed in particular on a respective lateral usually unprinted sheet edge. For further intended braking stations, these can be placed on pressure-free corridors and / or on sufficiently dried color areas. Unnecessary braking stations can be deactivated and / or shifted from the area of the sheet format. Alternatively, however, post-grippers can also be used.

The 2 shows a perspective view of the sprocket shaft 4 which is assigned immediately adjacent to the last sheet guiding cylinder of the machine. The sprocket shaft 4 has a shaft arranged parallel to the axis of rotation of the adjacent sheet guiding cylinder, the chain wheels on both sides for the circulating chains of the chain conveyor system 3 assigned. The sprockets act with the respective chain guide rails for guiding the gripper carriage in the range of the sprocket shaft 4 together. The sprockets are thus coaxial and spaced from each other in particular fixed to the sprocket shaft 4 assigned. The sprocket shaft 4 is associated with a drive which the Kettenradwelle 4 synchronously to the drive wheel train rotatively drives about its axis of rotation. Preferably carries the sprocket shaft 4 Here a helical gear, which cooperates with the drive of the machine or is driven by this. The particular firm of the sprocket shaft 4 associated helical gear is preferably as part of the continuous drive wheel train or gear train of the machine in meshing engagement with a gear of the immediately preceding sheet guiding cylinder, in particular of the printing cylinder 2 , One in the area of the sprocket shaft 4 Guided gripper carriage of the chain conveyor system 3 takes an arc in a common transfer centers by gripper closure of a gripper system of the upstream sheet guiding cylinder, in particular of the printing cylinder 2 ,

The sprocket shaft 4 has between the two sprockets at least two and preferably exactly two arch support segments 6 for simultaneously supporting a sheet against the cylindrical surface of the sheet guiding cylinder, in particular printing cylinder 2 , on. At least one and preferably both arch support segments 6 are axially displaceable with respect to the sprocket shaft 4 stored for example on a hub. In the double-sized version of the sprocket shaft 4 For example, each hub has exactly two arcuate support segments 6 on, which are arranged diametrically arranged fixed to the hub. Due to the common storage of the bow support segments 6 on an axially opposite the shaft of the sprocket shaft 4 displaceable hub is carried out a common adjustment of the arch support segments 6 the respective page. The hub may, for example, have rollers rolling on the surface of the shaft. It can be provided each hub, for example, assign six roles, preferably on ground tracks of the sprocket 4 to run. For axial adjustment of the arch support segments 6 In particular, an adjusting means is provided. Preferably, one or for each hub, a drive, for example, an electrically operating drive motor, for example on the operating side, provided, which preferably engages via a spindle drive on the respective hub and an axial adjustment of the hub or the hub associated Bogenstützsegmente 6 causes. For example, the axial adjustment of the sheet support segments 6 be made on the sheet format together with the axial adjustment of the braking stations of the sheet brake. The axial adjustment can continue to be made and / or monitored automatically on the basis of the same data by a control device, in particular the machine control.

The bow support segments 6 are preferably so far apart apart that bow maximum to be processed formats can be supported on the respective lateral sheet side edges. Further, it may be provided, one or both sheet support segments 6 shift out of the maximum sheet size to, for example, a sheet transport without Bogenstützsegmente 6 or to allow maintenance. It can also be the arch support segments 6 or hubs independently be axially adjustable or displaced or adjusted or relocated. The drive motors for axial adjustment of the sheet support segments 6 supporting hubs are for example by the control device, in particular machine control, independently controllable. For the circulating gripper carriages of the chain conveyor system 3 have the bow support segments 6 Recesses on or their circumferential extent is dimensioned accordingly.

For example, a respective arch support segment 6 a hanger 6 which is preferably kept in a separate plane. The temple 6 is circumferentially a supporting elements supporting traction means, in particular a pressing elements 7 carrying chain 8th , assigned. The coat hanger 6 includes a circumferentially oriented guide for the traction means, in particular the chain 8th , which thus in the circumferential direction or in and / or against the sheet conveying direction BFR opposite the hanger 6 can be shifted or moved. The traction means associated with supporting elements, in particular those of the chain 8th associated pressing elements 7 , are correspondingly at displacement of traction means or chain 8th together in the circumferential direction along the bracket 6 or the leadership of the temple 6 relocatable stored. This can be a common displacement of the support elements, in particular pressing elements 7 , in and / or against the sheet conveying direction BFR for setting, in particular for format adjustment done.

The traction means, especially the chain 8th , associated support elements, in particular pressing elements 7 , have an arc contact surface with minimal axial extent. The axial extent of an arc contact surface may be, for example, 0.5 mm to 3 mm, preferably at least approximately 1 mm. The support elements, in particular pressing elements 7 , preferably contain elastic material or are made of elastic material. The pressing elements 7 may in particular contain rubber or be made of rubber. For example, the support elements, in particular pressing elements 7 , in sheet conveying direction BFR seen also have a wedge-shaped cross-section or an increased arc contact surface. In the circumferential direction or along the sheet conveying direction BFR can the extension of the pressing elements 7 for example, up to 50 mm. By a contact line of the support elements, in particular the sheet contact surfaces of the pressing elements 7 , Is an arc against the cylinder surface of the sheet guiding cylinder, in particular impression cylinder 2 , pressed and thus on this fixable or durable. A bow camber is thus avoided, as long as the arc between the support elements, in particular pressing elements 7 , and the sheet guiding cylinder, in particular impression cylinder 2 , is located. A bow is preferred exclusively by the support elements, in particular pressing elements 7 , pressed against the cylindrical surface and not by Bogenstützsegmente 6 sucked.

For example, here are two respective arch support segments 6 sprocket hub bearing hub 4 In particular, furthermore, has a hub sleeve which can be moved in the circumferential direction and which is preferably mounted in a rotationally movable manner on the hub. The hub shell is preferably associated with a separate drive, which is the hub shell relative to the hub in the circumferential direction or in and / or against the sheet conveying direction BFR can relocate. The drive may for example be arranged directly on the hub or hub shell and displace the hub shell relative to the hub. The hub may, for example, have an internally toothed toothed segment into which a pinion driven by the drive engages. The hub shell or the drive corresponding to the hub axially along the shaft of the sprocket shaft 4 relocated. Preferably, the energy and / or signal transmission to the seated on the hub drive by means of a rotary input 11 the rotatably mounted sprocket shaft 4 , For example, a cable guide takes place in the interior of the sprocket shaft 4 to about the center of the machine, where in particular a cable tow is provided for storing the cable. From the cable tow from a supply of the two each assigned to a hub drives.

Preferred is a sprocket shaft 4 and in particular a respective hub shell assigned at least one fixing device for preferential pneumatic zone-wise fixing a sheet trailing edge. With the double-sized version of the sprocket shaft 4 each hub shell carries exactly two diametrically arranged fixing devices, which are preferably each fixedly connected to the hub shell. By a respective hub sleeve relative to the hub displacing drive the fixing means in and / or against the sheet conveying direction BFR be placed on the respective sheet trailing edge. By the drive is particularly preferred at the same time the arch support segment 6 , in particular the temple 6 , associated traction means, in particular the chain 8th , with moves. The traction means, in particular the chain 8th is, in particular, also in and / or against the sheet conveying direction BFR along the guide of the temple 6 relocated. Preferably, a respective fixing device in such a way with the traction means, in particular a chain link of the chain 8th connected, that an adjusting movement of the fixing device at the same time an adjustment of the traction means associated support elements, in particular of the chain 8th associated pressing elements 7 , causes.

The 3 shows a perspective view of the sprocket shaft 4 with support elements, in particular pressing elements 7 , carrying bow support segments 6 , especially ironing 6 , and fixing devices for the sheet trailing edge. The fixing devices are in particular exclusively in the area of the sheet support segments 6 , especially hanger 6 , between the arch support segments 6 , especially ironing 6 , wherein each one fixing device directly to a sheet support segment 6 , especially hanger 6 , assigned. Other fixing devices for the sheet trailing edge between the two outer fixing the rear corners corners fixing are not provided. In particular, exactly one fixing device will be a respective arch support segment 6 , especially hanger 6 , assigned. In each case, a fixing device is preferably immediately adjacent to a sheet support segment 6 , especially hanger 6 , stored and / or opposite a sheet support segment 6 , especially hanger 6 , in particular movably mounted for a setting. The fixing devices are in particular in the sheet longitudinal direction, ie in the sheet conveying direction BFR , and / or in the sheet width direction, ie transversely to the sheet conveying direction BFR Formatted adjustable. The fixing devices are preferred together with support elements, in particular pressing elements 7 , the bow support segments 6 , especially hanger 6 Formatted adjustable. Preferably, the fixing means with the support elements, in particular pressing elements 7 be simultaneously or jointly adjusted by the seated on the hub drive.

In particular, a respective fixing device for the sheet trailing edge contains a contact element, which preferably acts as a pneumatic suction device 10 fixed a limited area of the sheet trailing edge sucking. In particular, each fixing device, in particular each sucker 10 , A separate pneumatic connection, wherein the pneumatic connections of the fixing devices, in particular suckers 10 , Preferably with a common compressed air generator in pneumatic connection or flow connection. In particular, the compressed air generator provides a permanently above atmospheric pressure and / or non-clocked pneumatic pressure, which is correspondingly at the pneumatic connections of the fixing devices, in particular suckers 10 , is available. As a compressed air generator, for example, a compressor can be used. Particularly preferably, the pneumatic connection of the fixing devices, in particular suckers 10 , also via a rotary input 11 the rotatably mounted sprocket shaft 4 , in particular under realization of a cable tow, for example in the middle of the machine. The compressed air generator is here in particular with both laterally arranged fixing the bow simultaneously fixing, in particular suckers 10 , in connection. In the double-sized delivery drum, especially sprocket shaft 4 , is the compressed air generator with all or exactly four fixing, in particular suckers 10 , in pneumatic connection or flow connection.

A contact element of the fixing device has an at least approximately flat contact surface for an arc region. In particular, a sucker 10 a suction surface, which transmits a suction effect of the fixing device to the sheet. The pneumatic suction cups 10 The fixing devices preferably each have at least one opening for generated suction air in the suction surface, through which a sheet is in contact with the suction device 10 is held. For example, every sucker 10 a number of openings or suction openings, for example four to six suction openings, have. The fixing devices can also, for example, exchangeable contact elements, in particular suckers 10 , Which, for example, have differently arranged or formed apertures or openings. The contact surface of a contact element or the suction surface of a nipple 10 For example, an extension of up to 20 mm in the sheet conveying direction BFR and / or up to 50 mm across the sheet conveying direction BFR respectively. Each fixing device is preferably associated with an air control element in particular immediately adjacent to the suction surface, which preferably as a solenoid valve 13 , Particularly preferred as a quick-acting valve is formed.

The fixing means could also have a separate support, but are preferably the arch support segments 6 , especially ironing 6 , directly assigned. The contact surfaces of the contact elements, in particular the suction surfaces of the suckers 10 , the fixing devices are preferably always in the amount of the support elements, in particular the contact surfaces of the pressure elements 7 , the bow support segments 6 held. For example, the contact elements, in particular suckers 10 be taken up by a fixing device via a lockable connector. In particular, a contact element, in particular sucker 10 be associated in the axial direction of a recording of the fixing device, wherein the contact element, in particular the sucker 10 , Fixable by the fixing device, for example via a ball catch in its position can be included. This allows differently shaped contact elements, in particular suckers 10 be associated with a fixing each interchangeable. In particular, contact elements, in particular suckers 10 , Different material composition and / or shaping of a fixing device are each assigned interchangeable. For adjustment, assembly, cleaning and / or maintenance work, the contact elements, in particular suckers 10 , quickly or without tools removable or exchangeable associated with the fixing.

The 4 shows a side view of example double-sized sprocket shaft 4 with arranged on traction means supporting elements, in particular chains 8th arranged pressing elements 7 , The one respective arch support segment 6 , in particular a bracket 6 , associated chain 8th is as a closed chain 8th around a hanger 6 placed and is from the temple 6 guided in the circumferential direction. On the inside side is the chain 8th from a clamping device, in particular from a tensioning roller 9 held in desired or adjustable voltage. An adjusting means, in particular a drive, preferably an electrically operating drive motor, is in this case for displacing the pressing elements 7 carrying chain 8th opposite the hanger 6 in and / or against the sheet conveying direction BFR especially intended for setting or format setting.

The chain 8th has hingedly interconnected links on which the pressing elements 7 are assignable. It can each chain link of the chain 8th exactly one pressing element 7 be assigned. The pressing elements 7 are the chain 8th preferably assigned changeable, wherein a respective pressure element 7 from a chain link of the chain 8th can be received positively and / or non-positively. In particular, a pressing element 7 from a chain link of the chain 8th taken over a lockable connector. A pressing element is preferred 7 via a screw connection of a respective chain link of the chain 8th added. This allows differently shaped pressure elements 7 a respective chain link of a chain 8th each be assigned interchangeably. In particular, pressing elements can 7 different material composition and / or shaping a respective chain link of a chain 8th each be assigned to each other interchangeable. For adjustment, assembly, cleaning and / or maintenance work are the pressing elements 7 quickly removable or exchangeable chain 8th respectively the arch support segments 6 , especially ironing 6 , assigned.

The 5 shows an enlarged view of a sheet support segment 6 , especially stirrups 6 , with a chain 8th associated pressing elements 7 and a fixing device for the sheet trailing edge. The fixing device has a compressed air connection connected to the compressed air generator and works according to the ejector principle. In this case, the fixing device contains in particular an ejector 12 , which opens in an outlet channel. Exhausted air can escape via the outlet channel directed, for example, in the direction of the shaft. Furthermore, deflecting or diverting means can be provided for the air emerging from the outlet channel. The fixing device preferably has an air control element, which in particular as a solenoid valve 13 is trained. About the air control element, in particular solenoid valve 13 , the suction effect of the respective fixing device is controlled, for example, as a function of the machine speed and / or of printing material properties. In this case, all fixing devices are preferably designed as ejector sucker. Preferably, each fixing device, in particular each sucker 10 , an air control element, in particular a remotely controllable solenoid valve 13 , assigned to the individual and / or remotely controllable control of the suction effect, wherein the air control element, in particular the solenoid valve 13 , in particular the ejector 12 supplying compressed air controls.

The control of an air control element, in particular solenoid valve 13 , one or preferably each fixing device can be made by a control device, in particular the machine control. Preferably, the electrical control connection also takes place via a rotary inlet 11 the rotatably mounted sprocket shaft 4 and possibly a cable tow. In this case, an air control element, in particular solenoid valve 13 , of the control device, in particular machine control, for order-related adjustment of the pneumatic effect of the fixing device, in particular of the nipple 10 to be controlled. Particularly preferred is by the air control element, in particular the solenoid valve 13 , the beginning, the intensity and / or the end of the pneumatic suction of the fixing device, in particular of the nipple 10 , adjustable or changeable. The adjustment or change can also be made while the machine is running or during the printing process. Particularly preferred is by the air control element, in particular solenoid valve 13 , the suction effect of the fixing device, in particular of the nipple 10 , influenced or adjusted depending on the machine speed and / or material properties. The air control element, in particular solenoid valve 13 , can cooperate with the control device such that the beginning, the intensity and / or the end of the pneumatic effect can be set manually or automatically.

By means of the respective one fixing device, in particular sucker 10 , associated solenoid valve 13 especially the ejector 12 Controlling compressed air controlled so that the beginning, the intensity and / or the end of a suction is set. The adjustment of the suction air of the fixing device, in particular on the sucker 10 , by the air control element, in particular solenoid valve 13 , can also be made depending on the sheet travel in the sheet transfer and / or in the sheet release. The sheet travel can therefore be influenced and controlled individually and / or remotely during the printing process. An automated adjustment of the suction on the individual fixation devices, in particular suckers 10 , the sprocket shaft 4 can be made, for example, according to sensor values. In particular, in influencing the pneumatic suction, a dead time can be taken into account when building up the suction effect. This dead time can continue to be compensated, for example, speed-dependent.

The 6 shows an embodiment of a pressure element 7 for one on a hanger 6 guided chain 8th , The pressing element 7 can be a chain link of the chain via a screw connection 8th be assigned changeable. The pressing element 7 is particularly elastic and has a circumferentially extending and a minimum axial extension having contact surface for a bow. The pressing element 7 may be made of rubber, for example. An elasticity of the pressure element 7 can be achieved in particular by the choice of materials and / or a suitable shape design.

The 7 shows an embodiment of a contact element as a sucker 10 for a fixing device. The sucker 10 may the fixing device, in particular the ejector 12 to be assigned via a recording. For example, the sucker 10 Having guide surfaces which are received or guided by guide surfaces of the fixing device. For example, the sucker 10 be assigned in the axial direction of the fixing device, wherein preferably a lockable connector is provided for fixing the position. At its bottom of the teat 10 For example, at least one hemispherical recess may be provided, which cooperates with a spring-loaded detent ball of the fixing form-fitting for fixing position and thus a tool-free change or exchange of the teat 10 allows.

The sucker 10 has at least one and here in particular four openings and forms with centrally arranged supporting elevations the suction surface for the sheet trailing edge. The sucker 10 is preferably dimensioned such that its suction surface always or permanently at the level of the contact line of the immediately adjacent support element, in particular pressing element 7 , the bow support segment 6 lies. The sucker 10 may be further associated with an elastic coating such as a rubber coating. The orifices of the nipple 10 allow the effect of an ejector 12 generated suction air in regions on the sheet trailing edge, so that a sucking force the sheet trailing edge in contact with the suction surface of the nipple 10 holds.

How it works: Before a new job, such as a new print job, the sheet support segments 6 , especially the hangers 6 , be placed axially on the side edges of the new sheet format. Before, at the same time or even afterwards, the fixing devices, in particular suckers, can be used 10 , are placed on the sheet trailing edge of the new sheet format, wherein preferably at the same time the support elements, in particular pressing elements 7 be shifted so that only the respective sheet side edge of the new sheet format by supporting elements, in particular pressing elements 7 , is contacted. If necessary, suitable support elements, in particular pressing elements 7 , the arch support segments 6 , especially ironing 6 , and / or suitable contact elements, in particular suckers 10 to which fixing devices are assigned.

During the subsequent sheet run support or press the sheet support segments 6 , especially hanger 6 , or the support elements, in particular the pressing elements 7 , a respective arc at the same time against the cylinder surface of the upstream sheet guiding cylinder, in particular printing cylinder 2 wherein a respective sheet trailing edge adjacent to the sheet support segments 6 , especially ironing 6 , or the support elements, in particular the pressing elements 7 , in the area of arch support segments 6 , especially hanger 6 , or the support elements, in particular the pressing elements 7 , Exclusively by the immediately adjacent arranged fixing, in particular suckers 10 , held and run.

The suction air of the fixing devices, in particular suckers 10 , It is preferably obtained according to the ejector principle from compressed air of a compressed air generator, wherein in each case the fixing means, in particular suckers 10 , assigned air control elements, in particular solenoid valves 13 , control the suction air precisely. If required, an individual and / or remotely controllable change in the suction air control can be made. For example, a control of the air control elements, in particular solenoid valves 13 , according to characteristic curves. This can be a maximum suction during sheet transfer in the transfer centers. Subsequently, for example, depending on the angle, a reduction of the suction effect can be made, since for holding the on the suction surface of the nipple 10 adjacent sheet trailing edge a lower suction force is sufficient.

LIST OF REFERENCE NUMBERS

1

display

2

pressure cylinder

3

Chain Conveyor System

4

sprocket

5

delivery pile

6

Arch support segment, bracket

7

pressing element

8th

Chain

9

idler

10

Mammal

11

rotary Joint

12

ejector

13

magnetic valve

BFR

Sheet conveying direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 7303778 U [0002]
• DE 2813136 A1 [0002]
• US 2965026 [0003]
• GB 2256426 A [0003]
• DE 3535621 A1 [0004]
• DE 19644011 A1 [0004]
• DE 102004031171 A1 [0005]
• DE 517004 [0005]
• DE 102005002509 A1 [0006]
• DE 102013224489 A1 [0006]
• DE 102015204113 A1 [0006]
• DE 10014417 A1 [0007]
• DE 102004051323 A1 [0007]
• DE 102004052656 A1 [0007]
• DE 102011012808 A1 [0007]
• DE 102004009703 A1 [0007]

Claims (15)

Sheet transport device for a sheet-processing machine with a sheet of a sheet guiding cylinder (2) receiving sheet conveying system (3, 4), with a gripping device (3) for clamping fixing and transporting a respective sheet leading edge and at least two at the same time on the cylinder surface of the sheet guiding cylinder (2 ), wherein the sheet supporting segments (6) support the sheet exclusively supporting or pressing against the cylindrical surface leading support elements (7) and wherein pneumatic fixing means (10) are provided for the sheet trailing edge, characterized in that at least one sheet support segment ( 6) and a fixing device (10) are mounted displaceably together transversely to the sheet conveying direction (BFR). Device after Claim 1 , wherein one or exactly one of the sheet support segment (6) associated fixing device (10) is mounted displaceably together with the sheet support segment (6). Device after Claim 1 or 2 in which fixing devices (10) are arranged exclusively in the region of the sheet support segments (6) between the sheet support segments (6) and / or one or exactly one fixing device (10) is associated with a sheet support segment (6) and / or each fixing device (10) having separate pneumatic connection. Device after Claim 1 . 2 or 3 wherein the sheet support segment (6) is mounted on a hub axially displaceable to a sprocket shaft (4). Device after Claim 1 . 2 . 3 or 4 in which a fixing device (10) associated with the sheet support segment (6) is mounted indirectly on a hub which is displaceable axially relative to a sprocket wheel shaft (4). Device after Claim 1 . 2 . 3 . 4 or 5 in which a fixing device (10) assigned to the sheet support segment (6) is mounted on a hub shell, which is movably mounted relative to a hub carrying the sheet support element (6). Device after Claim 1 . 2 . 3 . 4 . 5 or 6 in which a hub sleeve bearing a fixing device (10) is designed to be circumferentially adjustable relative to a hub carrying it and / or designed to be axially displaceable together with it. Device after Claim 1 . 2 . 3 . 4 . 5 . 6 or 7 , wherein an adjusting means for axial displacement of the sheet supporting segment (6) and via a hub shell, the fixing device (10) supporting hub is provided. Device after Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 or 8th wherein a drive for common axial displacement of the sheet support segment (6) and the associated fixing device (10) has a spindle drive and / or displaced by a displacement of a hub, the sheet support segment (6) and the associated fixing device (10). Device after Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8th or 9 in which an adjusting means is provided for displacing a hub sleeve relative to a hub supporting the sheet support segment (6), and this adjusting means is arranged on the hub or hub shell. Device after Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 or 10 , Wherein one or all support elements (7) are displaceably connected together with the associated fixing device (10) in the circumferential direction and / or in and / or against the sheet conveying direction (BFR). Device after Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 or 11 wherein each arch support segment (6) has a support element (7) carrying traction means (8) which is connected to the associated fixing device (10). Device after Claim 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8th . 9 . 10 . 11 or 12 , wherein the fixing devices (10) each have a compressed air connection and operate according to the ejector principle. Method for transporting sheets from a sheet guiding cylinder (2) to a sheet conveying system (3, 4) in a sheet processing machine, wherein a gripping device (3) clampingly fixes a respective sheet leading edge for transport, the sheet of at least two circulating sheet supporting segments (6) simultaneously is held on the cylindrical surface of the sheet guiding cylinder (2), wherein the sheet support segments (6) by means of support elements (7) exclusively supporting or pressing lead to the cylinder surface and wherein pneumatic fixing (10) hold the sheet trailing edge, characterized in that at least one sheet support segment (6) and a fixing device (10) is displaced together transversely to the sheet conveying direction (BFR). Method according to Claim 14 , wherein a common displacement of sheet support segment (6) and fixing device (10) by axial displacement of a hub carrying this along a sprocket (4) by an adjusting means and / or via a spindle drive.

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