Printing press with non-impact printing device

Abstract

The invention relates to a printing press having a plurality of processing stations for processing individual sheets (77), wherein the processing stations are arranged one after the other in the conveying direction (T) of the sheets (77), at least one of the processing stations having a non-impact printing device (13), the processing station having the non-impact printing device (13) or another processing station having a first conveying device for conveying the sheets (77) along a straight conveying section, the first conveying device having at least one circulatingly rotating conveying belt (16) which is deflected on a rotating deflection roller (76), the first conveying device being designed to convey a succession of individual sheets (77) one after the other lying flat on the at least one conveying belt (16) thereof, a second conveying device being arranged downstream of the processing station having the first conveying device, the second conveying device conveying the sheets (77) likewise lying flat on at least one circulatingly rotating conveying belt (18), in the conveying plane (E19) of the sheets (77) to be conveyed, at the point at which the sheets (77) to be conveyed are transferred from the conveying belt (16) of the first conveying device to the conveying belt (18) of the second conveying device arranged downstream in the conveying direction (T) of the sheets (77), a break point (78) being formed in the mechanical support of the respective sheet (77) to be transferred, wherein the deflection roller (76) deflecting the at least one conveying belt (16) of the first conveying device is arranged at the break point (78) of the sheet (77) to be transferred, wherein a guide device (42) extending transversely to the conveying direction (T) of the sheets (77) is arranged at the break point (78), the guide device having a profile element (79) ending in a point, the point of the profile element (79) pointing in the conveying direction (T) of the sheets (77) against the respective conveying belt (16) of the first conveying device.

Description

TECHNICAL FIELD

[0001] The present invention relates to a printing press having a printing unit of the kind mentioned in the preamble. BACKGROUND

[0002] The suction belt table described below is a machine unit used in a machine structure for processing sheet-like substrates (hereinafter referred to as sheets), wherein the machine structure has a plurality of machine units arranged one after the other in the conveying direction of the sheets. Here, at least two of the machine units each have a conveying device for conveying the sheets. The suction belt table is used to convey processed sheets or sheets to be processed along a straight conveying section in the machine structure concerned, wherein the sheets are conveyed individually lying flat on at least one conveying belt. When the sheets are lying flat on the at least one conveying belt, each sheet is subjected to a suction force, i.e. is held in frictional or force-locked manner on the conveying belt concerned by means of a holding force generated by a suction flow. The suction force is usually achieved by means of a low pressure adjusted relative to the surrounding atmospheric pressure by means of the use of a suction device acting on the respective sheet.

[0003] In a preferred application, the suction belt table is arranged in the machine structure for processing sheets after a dryer for drying the sheets in the conveying direction of the sheets. In an improved embodiment, the suction belt table is arranged only after a cooling section for tempering and / or conditioning the sheets heated in the dryer, which first follows the dryer. Machine structures of the type described above, whether they have or do not have a cooling section after the dryer, usually have a plurality of processing stations acting on the sheets arranged one after the other in the conveying direction of the sheets, wherein each processing station is designed as a machine unit in the machine structure for processing sheets. The suction belt table can be arranged as described immediately after the dryer, so that between the dryer mentioned and the suction belt table, or only after the cooling section formed after the dryer, no other processing stations are arranged. In the machine structure used here as a preferred embodiment, the conveying device of the dryer or the associated cooling section arranged at least before the suction belt table is designed as a conveying device for conveying the sheets lying flat along a straight conveying section. The dryer is therefore designed in particular as a single-layer through dryer.

[0004] A further conveying device arranged behind the suction belt table in the conveying direction of the single sheets is designed as a conveying device for conveying the single sheets along a curved, in particular arc-shaped, conveying section. This further conveying device is preferably arranged directly behind the suction belt table, i.e. between the suction belt table and the further conveying device arranged behind it, in the machine structure concerned, without further processing stations being arranged between the suction belt table and the further conveying device arranged behind it. Thus, the single sheets to be conveyed by the machine structure are changed from a straight conveying section to a curved, in particular arc-shaped, conveying section after leaving the suction belt table. As will be shown below, the change from a straight conveying section to a curved, in particular arc-shaped, conveying section on the suction belt table is sometimes a great problem.

[0005] A sheet conveying structure for conveying a sheet along a processing unit is known from US 9,573,780 B2, which sheet conveying structure is configured for a processing process of the sheet, wherein the sheet conveying structure comprises the following components: a feeding unit comprising a conveying belt and a deflection element, wherein the conveying belt is configured for feeding a single sheet in a conveying direction along the processing unit to the deflection element, wherein the single sheet is resting on the belt with a contact side and is placed with a processing side towards the processing unit, the deflection element is arranged in contact with the conveying belt in order to deflect the conveying belt in the conveying direction downstream with respect to the processing unit, a separating unit for separating the single sheet from the conveying belt, wherein the separating unit is connected with an air supply and comprises a holding blow device, which is arranged in a holding region in order to direct a holding air flow onto the processing side of the single sheet in order to drive the single sheet in the direction of the conveying belt in the vicinity of the deflection element for separating the sheet from the conveying belt, and the sheet conveying structure comprises a lifting blow device, which is arranged in a lifting region for lifting the sheet from the conveying belt in order to direct a lifting air flow to the contact side of the sheet, wherein the lifting region is arranged such that the lifting region extends only over a middle section of the width of the sheet, which width is the dimension of the sheet in a lateral direction perpendicular to the conveying direction.

[0006] A single sheet conveying structure for conveying a single sheet between two feeding machines is known from US 2016 / 0152045 A1, which single sheet conveying structure has:

[0007] a) a feeding machine having a conveying belt, wherein the feeding machine is configured for conveying a single sheet in a conveying direction along a processing unit to a transfer region for transferring the single sheet to a receiving feeding machine, which processing unit is configured for exerting a processing action on a processing side of the single sheet, wherein the single sheet has a contact side, which is in contact with the conveying belt,

[0008] b) A sheet-fed blowing unit connected to an air delivery source, the sheet-fed blowing unit having an air knife configured to direct airflow toward the processing side of the sheet (wherein the processing side is opposite to the contact side) to press the sheet against a support element for supporting the sheet during conveying in the transfer area, wherein the sheet-fed conveying structure further has a control unit configured to operate the sheet-fed blowing unit according to at least one sheet-fed characteristic in conjunction with the medium characteristics of the sheet-fed, wherein the medium characteristics of the sheet-fed define the corrugation characteristics of the sheet-fed.

[0009] A printing press is known from US2020 / 0017310A1, comprising: a first feed belt for conveying sheets of paper and a second feed belt following it, wherein a guide element for the sheets of paper is arranged between the first and second feed belts, wherein a blowing device is provided for lifting the leading edge of the corresponding sheet of paper in a region of transition from the first feed belt to the guide element, and the blowing device is preferably arranged before the guide element when viewed in the conveying direction of the sheet of paper.

[0010] A sheet-fed paper processing machine is known from DE102017212984A1, wherein at least one extension sensor is arranged along a conveying path for conveying sheet paper to detect at least one spatial extension of the sheet paper, and at least one compression device is arranged, the compression device having at least one first compression body and at least one second compression body and at least one force transmission element, and the at least one first compression body is arranged to be able to move from a passing position toward at least one second compression body into a compression position by means of at least one force transmission element, and when the first compression body is arranged in the passing position, the at least one force transmission element is pre-tightened, and the at least one compression device has at least one blocking device that can switch between a blocking state and a releasing state, the blocking device being arranged in the blocking state to prevent at least one first compression body from moving from its passing position into its compression position.

[0011] A digital printing press is known from US2018 / 0072076A1, comprising:

[0012] The first sheet of paper made from the first material is fed onto the conveyor belt.

[0013] A second sheet of paper made of a second material is fed onto the conveyor belt.

[0014] A printing head for printing on the front and back of a single sheet of paper, wherein the printing head is directed toward the feed belt of the first single sheet.

[0015] A flipping device for flipping the printing sheet between the printing front and printing back, and

[0016] A dryer is used to dry the printed content that has been printed onto a single sheet of paper by the print head, wherein the dryer points to the feed belt of the second sheet of paper.

[0017] DE102016207397A1 discloses a machine structure for processing single sheets of paper, the machine structure having a suction belt table arranged after a dryer for drying single sheets of paper.

[0018] A device with a fan unit is known from US2009 / 0190981A1 for separating a moving sheet of paper from a conveyor belt that carries the sheet of paper, wherein the fan unit blows air substantially opposite to and perpendicular to the direction of movement of the sheet of paper in its central segment, and blows air laterally in substantially opposite to and relative to the direction of movement of the sheet of paper in the side segments. Summary of the Invention

[0019] The purpose of this invention is to provide a printing press with a plateless printing device.

[0020] According to the present invention, a printing press having a non-printing plate printing device has a plurality of processing stations for processing individual sheets of paper, wherein the processing stations are arranged sequentially along the conveying direction of the individual sheets of paper, wherein one of the processing stations has the non-printing plate printing device, and a corresponding processing station having the non-printing plate printing device or another processing station has a first conveying device for conveying individual sheets of paper along a straight conveying section, the first conveying device having at least one conveyor belt that deflects on a rotating deflection roller and rotates in a circular manner, wherein the first conveying device is designed to convey a series of adjacent individual sheets of paper that are closely following each other in a flat manner on at least one of its conveyor belts. Following the processing station equipped with the first conveying device, a second conveying device is arranged. This second conveying device also conveys individual sheets of paper in a flat, straight conveying section along at least one circulating conveyor belt. In the feeding plane of the individual sheet to be conveyed, at the location where the individual sheet to be conveyed is transferred from the corresponding conveyor belt of the first conveying device to the corresponding conveyor belt of the second conveying device, which is positioned downstream along the conveying direction of the individual sheet, an interruption is constructed in the mechanical support portion of each transferred individual sheet. A deflection roller that deflects at least one conveyor belt of the first conveying device is arranged at the interruption portion in the mechanical support portion of the transferred individual sheet. A transverse... A guiding device extending in the conveying direction of a single sheet of paper, the guiding device having a pointed, tapering profile element, wherein the guiding device is arranged at an interruption between two conveyor belts arranged sequentially along the conveying direction of the single sheet of paper, wherein the tip of the profile element points towards the corresponding conveyor belt of the first conveyor device opposite to the conveying direction of the single sheet of paper, wherein the tip of the profile element and the corresponding conveyor belt of the first conveyor device, which is deflected on a rotating deflection roller, are separated by a gap, wherein the gap has a width in the range of 1 mm to 5 mm between the tip of the profile element and the corresponding conveyor belt of the first conveyor device, which is deflected on a rotating deflection roller, wherein a control unit and a control unit are provided. The processing station, located immediately following the processing station with the first conveyor, is designed as a suction belt table, with one less lifting nozzle. At least one lifting nozzle is arranged in the profile element of the guide device, and the corresponding lifting nozzle is designed to open towards the tip of the profile element. The suction belt table has a paper-grabbing device with operationally occupied paper-grabbing positions for individual sheets of paper to follow each other adjacently. In its paper-grabbing position, the paper-grabbing device captures and stacks the individual sheets of paper conveyed to the suction belt table from the first conveyor arranged before the suction belt table. The capture and stacking are carried out on the suction belt table before being transferred to the conveyor arranged after the suction belt table.

[0021] The advantages of this invention are particularly the ability to transfer single sheets of paper seamlessly between processing stations on a printing press. Other advantages will become apparent from the description below. Attached Figure Description

[0022] Embodiments of the present invention are shown in the accompanying drawings and described in more detail below.

[0023] in:

[0024] Figure 1 The suction belt table is shown in the structure of a machine that processes single sheets of paper.

[0025] Figure 2 Showing according to Figure 1 Side view of the suction belt table;

[0026] Figure 3 Show Figure 2 A top view of the suction belt table shown;

[0027] Figure 4 A side view of the paper-catching device integrated into the suction belt table is shown.

[0028] Figure 5 Indicated by its parking position Figure 4 The paper-catching device in the middle;

[0029] Figure 6 It is shown by its gripping position Figure 4 The paper-catching device in the middle;

[0030] Figure 7 Show Figure 2 A partial view of the image, showing the paper-catching device in its paper-catching position;

[0031] Figure 8 The pneumatic circuit for operating the paper catcher is shown;

[0032] Figure 9 A graph showing the stroke of the piston of the pneumatic cylinder that drives the paper-catching device is displayed.

[0033] Figure 10 A graph showing the speed of the cylinder piston during paper-catching device operation;

[0034] Figure 11 A graph showing the acceleration of the cylinder piston during paper gripping device operation;

[0035] Figure 12 A graph showing the piston force distribution of the cylinder piston during paper gripping device operation;

[0036] Figure 13 A schematic diagram of a circuit for releasing the frictional or force-locked engagement of a single sheet of paper held on a suction belt stage is shown.

[0037] Figure 14 Shown in Figure 3 A partial view of the suction belt stage shown in the top view;

[0038] Figure 15 The diagram shows a guiding device between two conveyor belts arranged sequentially along the direction of sheet transport;

[0039] Figure 16 This shows the initial state of the guidance device's functionality.

[0040] Figure 17 The guidance device is shown at the start of guidance device activation;

[0041] Figure 18 The activated guide device is shown;

[0042] Figure 19 The guide device is shown when receiving a single sheet of paper;

[0043] Figure 20 A suction belt table with a mouthpiece device is shown. Figure 3 A partial view of the top view shown;

[0044] Figure 21 The suction belt stage is shown in Figure 2 A partial view of the side view shown. Detailed Implementation

[0045] exist Figure 1 An example of the machine structure mentioned at the beginning is shown. Such a machine structure is known, for example, from DE102016207397A1. The machine structure selected as an example for processing single sheets of paper first has a single sheet feeder 01 in the sheet-feeding direction, in which a first stack 02 of single sheets is prepared for processing. The single sheet is preferably a rectangular substrate made of paper, paperboard, or cardboard. The difference between paper, paperboard, and cardboard lies in their respective basis weight, i.e., the weight of a single sheet per square meter in grams. The basis weight of the paper is typically 30 g / m². 2 Up to 150g / m 2 Between these values, the basis weight of the cardboard is 150 g / m². 2 Up to 600g / m 2 Between these values, the basis weight of the cardboard is 600 g / m². 2 That's all. However, individual sheets can also be designed as substrates made of synthetic materials and / or as thin sheets. The sheet feeder 01 can also be designed as a silo-type feeder with multiple first stacks 02.

[0046] The suction head 03 sequentially grasps each stack of individual sheets from above, and feeds the individual sheets in a sequence separated from each other, for example by means of a first oscillating gripper 04 and, if necessary, a transfer drum 34 cooperating with the first oscillating gripper 04. The first coating device 05 is designed, for example, as a primer application device. The first coating device 05 has, for example, a printing cylinder 06 and a printing cylinder 07 cooperating with the transfer cylinder 06. The printing cylinder has an inking roller 08 that adheres to or is at least capable of adhering to the printing cylinder 07, preferably in the form of an anilox roller. To optimally dispense the coating material onto the surface of the individual sheets, at least one doctor blade or chamber doctor blade system 09 extends in the axial direction of the inking roller 08. The transfer cylinder 06 conveys the individual sheets held on its shell surface along a curved, particularly arc-shaped, transfer section. The first coating device 05 applies a coating material to one of the two sides of a sheet of paper, for example, applying a primer to the entire surface or only to a predetermined, i.e., partially, area. Then, the sheet of paper is conveyed from the conveyor roller 06 of the first coating device 05 to the non-printing plate printing device 13, for example by means of a first gripper system 11, particularly a first chain feeder, and for example by means of at least a first conveyor belt 12. When the sheet of paper is transferred to the non-printing plate printing device 13, the first gripper system 11 and the first conveyor belt 12 cooperate in such a way that the first gripper system 11 feeds the sheet of paper separately to the first conveyor belt 12, which has a straight conveying section, and the sheet of paper is conveyed from the first conveyor belt 12 to the non-printing plate printing device 13. The first conveyor belt 12 is preferably designed as a rotating, circulating belt. In an advantageous embodiment, a first dryer 14 is provided in the region of the first gripper system 11 for drying the single sheet of paper coated in the first coating device 05, wherein the dryer 14 is designed, for example, as a hot air dryer and / or a dryer that dries by means of infrared radiation or ultraviolet radiation.

[0047] The non-printing plate printing apparatus 13 typically has at least four inkjet printing units that can be controlled independently of each other. Each of these inkjet printing units coats a different printing ink onto a surface of a sheet of paper, for example, that has already been coated in the first coating unit 05, in order to produce a preferably color printed image. In the machine structure described here as an example, the non-printing plate printing apparatus 13 preferably has a second conveyor belt 16, on which the inkjet printing unit prints the sheet of paper while it is resting. The second conveyor belt 16 is preferably designed as a rotating circulating belt. However, multiple conveyor belts 16 may also be provided, for example, two parallel to each other along the sheet-carrying direction T. A second dryer 17 for drying the printed sheet of paper is arranged after the non-printing plate printing apparatus 13 in the sheet-carrying direction T. The second dryer 17 is also designed as, for example, a hot air dryer and / or a dryer that dries the paper by means of infrared radiation or ultraviolet radiation. The second dryer 17 has a conveying device 18 that carries single sheets of paper flat in a translating manner, i.e., along a straight conveying section. The conveying device 18... Figure 1 In the machine structure shown in the example, a third conveyor belt 18 is designed. The third conveyor belt 18 is also preferably designed as a rotating circulating belt. In this example, the conveyor 18 of the second dryer 17 transfers the dried sheet paper to the suction belt table 19, from which the sheet paper is transferred, for example by means of a second oscillating gripper 21 and optionally by means of a transfer drum 33 cooperating with the second oscillating gripper 21, to the second coating device 22. The second coating device 22 is designed, for example, as a painting device, which applies coating material, such as paint, in particular to the printed image previously created in the printout printing equipment 13. The second coating apparatus 22 also has a conveyor roller 23, for example designed as a printing roller, for use as a conveyor for conveying single sheets of paper. The conveyor roller 23 is, for example, a printing device roller 24, which has an inking roller 26 that is in contact with or at least able to be in contact with the printing device roller 24, preferably in the form of anilox roller. In the axial direction of the inking roller 26, there is at least one doctor blade 27 or a chamber doctor blade system 27.

[0048] Then, for example by means of a second gripper system 28, particularly a second chain feeder, the sheet paper is conveyed from the conveyor roller 23 of the second coating device 22 to the receiving device 29. In this machine configuration described as an example, the sheet paper processed is preferably stacked in the receiving device by the second gripper system 28 in a second stack 32. In an advantageous embodiment, a third dryer 31 is provided in the area of ​​the second gripper system 28 for drying the sheet paper coated in the second coating device 22. The third dryer 31 is designed, for example, as a hot air dryer and / or a dryer that dries by infrared or ultraviolet radiation. The receiving device 29 can also be designed as a multi-stack receiving device with multiple second stacks 32. Figure 1 The machine structure shown as an example is designed as a digital printer for use in industrial printing processes, particularly for producing printed products in large-scale production.

[0049] Figure 2 A side view of the suction belt stage 19 is shown, as exemplified by its design according to... Figure 1 The machine structure is arranged as described above. The conveying direction T of a single sheet of paper is... Figure 1 The direction is from right to left. Therefore, the individual sheets of paper are arranged sequentially from... Figure 2 The conveyor 18, shown only partially, transports paper to the suction belt table 19 at a speed of, for example, several thousand sheets per hour, or approximately 10,000 sheets per hour. Here, in the conveying direction T of the sheets, adjacent sheets, i.e., those following each other sequentially, are spaced apart by a gap. This gap is significantly smaller than the length of the sheet extending in the conveying direction T, and is only a few millimeters, for example, about 20 mm. In the preferred embodiment, the conveyor 18, arranged in the conveying direction T before the suction belt tables 1 and 9, is a dryer 17, wherein the dryer 17 is based on… Figure 1 The machine structure shown as an example is the second dryer 17, in which individual sheets of paper are conveyed horizontally, specifically in a translational manner, i.e., along a straight conveyor section, by means of the conveyor 18. The suction belt table 19 first receives each individual sheet of paper in a feed plane defined by the conveyor 18 arranged before the suction belt table 19 and imaginarily extended along the conveying direction T of the individual sheets, this feed plane being preferably horizontally oriented. In the further extension of the conveying path of the individual sheets, the feed plane E19 of the suction belt table 19 (… Figure 4The conveyor belt 18, positioned before the suction belt table 19, has a downward-pointing inclination at an acute angle ranging from 5° to 30°, preferably from 15° to 25°, relative to the horizontal feed plane of the conveyor 18. At the end of the conveying section defined by the suction belt table 19, each sheet of paper abuts against the front mark 36 of the oscillating gripper 21 positioned after the suction belt table 19 with its leading edge in the conveying direction T. Figure 1 The machine structure shown as an example is the second oscillating gripper 21. Each sheet of paper is individually conveyed by the oscillating gripper 21 to the transfer drum 33 that cooperates with the oscillating gripper 21. The sheets of paper are fully braked at the front mark and aligned in a conformal manner.

[0050] In a preferred embodiment, the suction belt table 19 has a lower overlap device for conveying individual sheets of paper. The lower overlap device, located above the feed plane E19 of the suction belt table 19, has a box-shaped housing, or so-called blow box 37, preferably extending across the entire width of the sheet, i.e., transversely to the conveying direction T of the sheet. In the blow box 37, a plurality of blow nozzles are arranged sequentially on its side facing the feed plane E19 of the suction belt table 19, along the conveying direction T of the sheet. In a preferred embodiment, at least two rows of multiple blow nozzles arranged side-by-side are arranged sequentially and transversely to the conveying direction T of the sheet. The respective blowing direction of the blow nozzles is substantially parallel to the feed plane E19 of the suction belt table 19 and points against the conveying direction T of the sheet. The respective blowing direction of the blow nozzles is determined, for example, by at least one guide surface, respectively arranged and / or molded on the blow nozzle in question, to guide the airflow. The corresponding guide surface on the side of the blow box 37 facing the feed plane E19 of the suction belt table 19 is designed, for example, as a slope rising vertically from the blow box 37. The blowing air flowing from the corresponding blow nozzle is preferably controlled by an adjustable pneumatic valve, for example, in terms of time and / or intensity, wherein the valve is controlled, for example, by a control unit 71 preferably programmed digitally. The valve is switched, for example, by the control unit 71, particularly according to a beat, wherein the beat duration and / or beat frequency are preferably adjusted according to the feed of individual sheets of paper to the suction belt table 19. The valve controlled by the preferably digital control unit 71 according to a beat is also called a beat valve.

[0051] In the sheet-carrying direction T, in the area between the feed plane E19 of the suction belt table 19 and the side of the blow box 37 facing the feed plane E19, a baffle 38 is arranged before the first blow nozzle or the first row of blow nozzles. The baffle 38 shields the leading edge of the subsequent sheet, i.e., the sheet immediately following the sheet blown by the blowing air from at least one blow nozzle of the blow box 37, to overcome the suction effect caused by the blow nozzles arranged in the blow box 37. The sheet blown from the feed plane E19 of the suction belt table 19 by at least one blow nozzle or a row of blow nozzles of the blow box 37 guides the blowing air flowing out of at least one blow nozzle of the blow box 37 and directs the blowing air past the side of the baffle 38 facing the blow box 37. The baffle 38 preferably has a concave arch at its end along the blowing direction, the arch of which the blowing air exits in a direction opposite to the feed plane E19 of the suction belt table 19, i.e., a direction away from it. The baffle 38 ensures that the leading edge of a sheet of paper immediately following a sheet blown up by blowing air from at least one nozzle remains unaffected until the blown sheet, through its own movement or feeding along the conveying direction T, exposes the first nozzle or first row nozzle reached by the sheet in the conveying direction T at its rear end. To prevent the leading edge of a sheet of paper immediately following a sheet of paper from being blown up by at least one blower nozzle from being prematurely blown up by the blower nozzle or the line of blower nozzles exposed to the rear end of the preceding sheet of paper, the blower nozzle or the line of blower nozzles involved is cut off by means of their respective valves, according to the movement or feeding status of the sheet of paper immediately preceding the sheet of paper currently lifted from the feed plane E19 of the front suction belt table 19 relative to the sheet of paper between the baffle 38 and the feed plane E19 of the suction belt table 19.

[0052] A single sheet of paper blown by a blow nozzle or a row of blow nozzles is lifted above the feed plane E19 of the suction belt table 19 to a certain floating height, for example, set by the distance between the side of the blow box 37 facing the feed plane E19 of the suction belt table 19 and the suction height caused by the suction effect (Venturi effect) induced by the corresponding blown air. This floating height depends on the intensity of the corresponding blown air and / or the mass of the single sheet involved and / or the conveying speed of the single sheet involved. To prevent large-mass and / or high-speed sheets of paper from vibrating and shaking as they are conveyed in the feed plane E19 of the suction belt table 19, a support plate is preferably provided in the area between the feed plane E19 of the suction belt table 19 and the side of the blow box 37 facing the feed plane E19 to support the lifted sheets of paper. For example, the support plate, arranged at an acute angle to the side of the blow box 37 facing the feed plane E19 of the suction belt table 19, is designed, for example, in the form of a permeable grid. The sheets of paper, lifted by the suction of blown air and pressed against the support plate, are guided there with quiet movement, i.e., without shaking, along the support plate in their conveying direction T. In the feed plane E19 of the suction belt table 19, at least in the area opposite the blow box 37, a plurality of openings 39 are preferably provided. Figure 3 To balance the pressure, air is supplemented by flowing through these openings 39 to the area below the currently lifted sheet of paper. These openings 39 are, for example, circular in diameter within a few millimeters. Additionally, a plurality of suction chambers 41, controllable in their respective fluidic effects, are provided below the feed plane E19 of the suction belt table 19. These suction chambers 41 are preferably arranged sequentially in the sheet-carrying direction T, and can be switched, for example, individually and independently of each other, by means of a suction device controlled by the control unit 71.

[0053] Figure 3 Shown in top view Figure 2 The suction belt table 19 is shown. The conveying direction T of a single sheet of paper is as follows. Figure 2The diagram shows the direction from right to left. Individual sheets of paper are then sequentially conveyed to the suction belt table 19 by a conveying device that transports the sheets in a translational manner, particularly by a conveying device belonging to the dryer 17. Here, each sheet of paper rests on at least one conveyor belt 18, preferably on multiple conveyor belts 18, for example, two conveyor belts 18 arranged parallel to each other in the sheet-carrying direction T. These conveyor belts 18 are designed, for example, as flat belts or flat belts that rotate in a loop or loop. At the transition from the conveyor device preceding the suction belt table 19 to the suction belt table 19, a guide device 42 extending transversely to the sheet-carrying direction T is provided. This guide device 42 preferably has multiple lifting nozzles 43 arranged in at least one row. Therefore, in the sheet-carrying direction T, following is at least one receiving belt 44, which is designed, for example, as a flat, swirling belt arranged in the middle region of the feed plane E19 of the suction belt table 19, and preferably as a suction belt, wherein the suction belt has perforations at least segmentally. Following the receiving belt 44 in the sheet-carrying direction T, or in its effective region within the feed plane E19 of the suction belt table 19, is at least one bend 46, preferably a plurality of bends 46; 47 following each other, provided for the stepwise bending of the previously, for example, horizontal, feed plane. At each bend 46; 47, the feed plane E19 of the suction belt table 19, relative to its previous orientation, undergoes an acute angle of inclination, if necessary, pointing further downward. Figure 2 and Figure 3 In the example shown, two bends 46 and 47 follow each other, wherein the first bend 46 is arranged within the effective area of ​​the receiving belt 44, and the second bend 47 is arranged behind the receiving belt 44 in the sheet-carrying direction T by a short distance less than the length of a single sheet. In the feed plane E19 of the suction belt station 19, two bridging belts 48 arranged parallel to each other in the sheet-carrying direction T are preferably arranged, for example, symmetrically across the distance between the bends 46 and 47 with respect to its centerline M. These bridging belts are, for example, in the form of circulating belts that are respectively rotating and preferably designed as suction belts. The bridging belts 48 are pivotally supported at their rear ends along the sheet-carrying direction T, particularly where the sheets brought by the receiving belt 44 first reach this rear end. Thus, these bridging belts 48 are pivotally extended upwards at an acute angle along the sheet-carrying direction T from the previous feed plane E19 of the suction belt table 19, and in their protruding operating state, form a vertical ramp for the sheet to be conveyed. Figure 2In the diagram, the bridging belt 48 is shown in its normal, i.e., unpivoted, and preferably flush with the remaining feed plane E19 of the suction belt table 19. In a preferred embodiment, at least in the edge regions of the corresponding longitudinal side of the area of ​​the feed plane E19 of the suction belt table 19 traversed by the bridging belt 48, a plurality of nozzles 49, preferably each designed as a Venturi nozzle, are arranged. This arrangement of the Venturi nozzles begins in the sheet-fed transport direction T at a distance, for example, less than 200 mm, preferably less than 100 mm, behind at least one lifting nozzle 43.

[0054] Above the feeding plane E19 of the suction belt table 19, paper-catching blowers 51 are arranged at intervals A51, extending transversely to the conveying direction T of a single sheet of paper. Figure 2 and Figure 3 The paper-grabbing blower 51 has multiple blowing nozzles arranged in rows extending across the entire width B19 of the feed plane E19 of the suction belt table 19. Below the paper-grabbing blower 51, in the feed plane E19 of the suction belt table 19, particularly in its central region, there is a switching area 52 that extends in the sheet-carrying direction T and has multiple suction holes 53. The suction holes 53 in the switching region 52 form and enable fluid-technical connection with at least one of a plurality of suction chambers 41 preferably arranged below the feed plane E19 of the suction belt stage 19, wherein these suction chambers 41 can be switched, or at least can be switched, individually and independently of each other, in terms of their respective pressures, thereby adjusting to, or at least being able to, a low pressure in the switching region 52 by means of the suction holes 53 and by corresponding adjustments to the pressures in the relevant suction chambers 41 in the feed plane E19 of the suction belt stage 19. The suction holes 53 arranged in the switching region 52 are, for example, symmetrically arranged with respect to the centerline M of the feed plane E19 of the suction belt stage 19 in multiple rows, for example, two rows, and are each designed, for example, to utilize the Bernoulli effect for suction. In the sheet-carrying direction T, following the switching area 52, for example, in an overlapping manner, is at least one conveyor belt 54, particularly designed as a suction belt, wherein the suction belt has at least segmented perforations, and wherein at least one conveyor belt 54 preferably extends in the sheet-carrying direction T below the blow box 37 of the lower overlapping device. At least one conveyor belt 54 is preferably designed as a rotating circulating belt. In a preferred embodiment, for example, multiple, for example, two conveyor belts 54 are arranged symmetrically with respect to the centerline M of the feed plane E19 of the suction belt table 19. Extending opposite the blow box 37 in the feed plane E19 of the suction belt table 19, and preferably having multiple openings 39 therein, (… Figure 3The area on the edge side extends longitudinally along the conveying direction T of the sheet in the feeding plane E19 of the suction belt table 19, at least partially relative to at least one conveyor belt 54, wherein, in order to balance the pressure, air is supplemented to flow under the sheet currently lifted by the lower overlapping device through the aforementioned opening 39.

[0055] In the conveying direction T of the sheet, following at least one conveyor belt 54 and / or below the overlapping device, are brake belts 56, preferably designed as rotating loops, arranged symmetrically in the feed plane E19 of the suction belt table 19, for example, with respect to the center line M of the feed plane. These brake belts reduce the respective conveying speed of the incoming sheet before it is transferred to the conveying device immediately following the suction belt table 19, for example, before it is conveyed to the oscillating gripper 21. Thus, the sheet, preferably with its reduced conveying speed, is caught by a rotating or at least rotatable suction roller 57, which is subjected to low pressure from the suction direction, during its further movement in the conveying direction T. The suction roller 57 extends transversely to the conveying direction T of the sheet, preferably at least over the entire width of the sheet or over the entire width B19 of the suction belt table 19. Then, each sheet of paper arrives sequentially and is individually held by the suction roller 57 at its leading edge in the conveying direction T, i.e., its leading edge, for example, held on the front mark 36 of the oscillating gripper 21 immediately following the suction belt table 19. Through the cooperation of the lower overlapping device, the brake band 56, the suction roller 57 and the front mark 36 of the oscillating gripper 21, the previously individually laid flat sheets of paper, which were conveyed sequentially with gaps between them, are converted into an overlapping flow. These sheets of paper are then transferred to the conveying device, such as the oscillating gripper 21, immediately following the suction belt table 19, so that they can be conveyed and passed through the coating device 22, for example, the coating device 22 designed as a painting device, in a machine structure having the suction belt table 19, for example, in a digital printing press.

[0056] In the operation of such machine structures, especially in the industrial printing process of digital printing presses, malfunctions repeatedly occur in processing stations 22, such as coating units, after the suction table 19, for various reasons. These serious malfunctions in processing stations cause the transfer of individual sheets to the conveyor after the suction table 19 to be abruptly interrupted. This operational situation results in a shutdown. When a shutdown occurs, the individual sheets being conveyed in the machine structure must be collected and stacked very quickly and efficiently. However, in the machine structure forming a digital printing press, due to structural constraints, particularly the lack of required height space, it is impossible to collect and stack large quantities of rapidly following individual sheets, i.e., sheets conveyed closely to each other at high conveying speeds, in processing stations arranged before the suction table 19, such as in the first coating unit 05, or in the non-printing plate printing unit 13, or in the dryer 17 arranged after the non-printing plate printing unit 13. Here, arranging the discharge device in the sheet-carrying direction T after the dryer 17 behind the printing plate unit 13 and in front of the suction belt table 19 is not a satisfactory solution. When the machine stops, the discharge device guides all the sheets still coming from the dryer 17 after the printing plate unit 13 to below the suction belt table 19 and stacks them there. This is because the sheets can only be stacked there in a more or less orderly manner. This solution also has the disadvantage that the sheets collected below the suction belt table 19 can only be retrieved again under very ergonomic conditions. Furthermore, it is almost impossible to arrange the necessary feeding element in the area of ​​the discharge device for the flow of individual sheets received from the dryer 17 that is required during trouble-free operation. However, without such a suitable feeding element, the holding force required to hold the sheets, which are often significantly warped due to the heat applied during drying, may be lost. Therefore, malfunctions occur in the sheet-carrying process. Therefore, before the individual sheets are transferred to the conveyor arranged after the suction belt 19, they must be captured and stacked on the suction belt 19. However, it should be noted that continuous bottom overlap to form a stack is not possible on the bottom overlap device of the suction belt 19. This is because the nozzle that acts on the rear edge of the individual sheet from above in a suction manner for overlap is ineffective for the immediately following individual sheet, since the previous individual sheet has not been conveyed when the individual sheets are collected, thus blocking the suction action on the next individual sheet below.

[0057] Therefore, a suction belt table 19 with a paper-grabbing device 58 is proposed, which captures and stacks individual sheets of paper that follow each other in sequence on the suction belt table 19 before transferring them to a conveyor arranged after the suction belt table 19. Here, in a preferred embodiment, the suction belt table 19 with a lower overlap device is preferably arranged after the dryer 17 located after the printout unit 13, along the sheet-carrying direction T. In a particularly preferred embodiment, the suction belt table 19 is arranged in the machine structure at a location where the sheet of paper is transferred from a straight conveyor section immediately preceding the suction belt table 19 to a curved conveyor section, particularly designed in the form of a single sheet, immediately following the suction belt table 19.

[0058] The proposed paper-catching device 58 has a crank-slider drive, the connecting part of which has at least one stop surface 66 for catching a single sheet of paper. See below. Figures 4 to 6 This section describes the details of the paper-catching device 58 and its working principle.

[0059] Figure 4 For example, a side view of the paper gripping device 58 is shown. When the paper gripping device 58 is not activated, i.e., not operated by the control unit 71, it is arranged below the feed plane E19 of the suction belt table 19, specifically preferably at the end of the switching area 52 of the suction belt table 19 with suction holes 53, extending approximately along the length of a single sheet along the sheet-feeding direction T, away from a line drawn from the paper gripping blower 51 perpendicular to the plane E19 of the suction belt table 19 at a distance A51. The paper gripping device 58 has an actuator 59, which is preferably designed as a double-acting pneumatic cylinder 81, the piston 82 of which can be applied compressed air on both sides. Figure 8The piston rod 61 of the pneumatic cylinder 81, capable of bidirectional linear motion, is connected to a crank 62 designed as an angle rod when a hinge point G61 is formed. The crank 62 is rotatably supported on a rotation point D62 fixedly arranged in the suction belt platform 19. The angle rod crank 62 has a short rod and a longer rod compared to the short rod. The short rod connects the hinge point G61 to the rotation point D62 of the crank 62, at which point the piston rod 61 of the pneumatic cylinder 81 is connected to the crank 62. The crank 62 itself is connected to a connecting member 63 when the hinge point G62 is formed. Here, the longer rod of the crank 62 extends between its rotation point D62 and the hinge point G62, at which point the crank 62 is connected to the connecting member 63. The connecting member 63 and the crank 62 of the driving connecting member 63 form a sliding crank mechanism when they cooperate, wherein the end point E2 of the connecting member 63 opposite to the driver 59 of the paper gripping device 58 can move bidirectionally in a straight line along a trajectory 64 arranged parallel to the feed plane E19 of the suction belt table 19. Therefore, the end point E2 of the connecting member 63 opposite to the driver 59 of the paper gripping device 58 and the rotation point D62 of the crank 62 are located on the straight line G64 connecting these two points, wherein the straight line G64 is distributed parallel to the feed plane E19 of the suction belt table 19.

[0060] The connecting member 63 has at least one stop surface 66 for capturing a single sheet of paper in the region between its end point E1 facing the driver 59 of the paper-catching device 58 and the hinge point G62, at which the crank 62 is connected to the connecting member 63. Therefore, the stop surface 66 is preferably a component of the connecting member 63. The stop surface 66 is preferably made of a synthetic material, such as polyamide (PA) or a thermoplastic synthetic material, such as polyoxymethylene (POM).

[0061] In a preferred embodiment, the crank-slider drive has a central crank-slider, meaning that: three in... Figure 4 The line segments G62-D62, G62-E2, and G62-E1 shown are designed to be of the same length, and the endpoints E1 and E2 of the connecting member 63, along with the hinge point G62 arranged therebetween, are all placed on one of the straight lines G63 connecting the endpoints E1 and E2 of the connecting member 63. The length ratio between the short and long rods of the crank 62 is such that the motion of the short and long rods, triggered by the drive 59 of the paper gripping device 58 and acting on the connecting member 63, is converted into a faster motion. The transmission ratio for converting into a faster motion is preferably at least 1:5 (i=0.2).

[0062] Combination Figures 5 to 7 The working principle of the paper-catching device 58 can be seen. Figure 2 and Figure 5The paper-grabbing device 58 is shown in an inactive state, i.e., an inactive starting or stopping position, in which at least one stop surface 66, respectively constructed on the connecting member 63, is arranged below the feed plane E19 of the suction belt table 19. Therefore, a single sheet of paper can pass unobstructed through its feed plane E19, which... Figure 5 The middle is represented by two directional arrows that follow each other. For example... Figure 5 As shown, the piston rod 61 of the pneumatic cylinder 81 that forms the driver 59 of the paper-catching device 58 extends by applying compressed air to the pneumatic cylinder 81 accordingly, and the end point E2 of the connecting member 63 opposite to the driver 59 of the paper-catching device 58 occupies the position furthest from the driver 59 of the paper-catching device 58 on the trajectory 64.

[0063] Figure 6 and Figure 7 The paper-grabbing device 58 is shown in its paper-grabbing position. In the paper-grabbing position, at least one stop surface 66, preferably constructed on the connecting member 63, passes through a corresponding opening 67, for example designed as a slit. Figure 3 The feed plane E19 passes through the suction belt stage 19 and, by pivoting motion, rises from a position previously inclined at a preferred acute angle to the feed plane E19 of the suction belt stage 19 to a position preferably perpendicular to the feed plane E19. Figure 6 and Figure 7 ), so that the single sheet of paper conveyed on the suction belt table 19 comes into contact with at least one upright stop surface 66, for example, extending from the feed plane E19 of the suction belt table 19 at approximately 50 mm (see Figure 6 The direction arrows in the diagram are captured and prevented from further movement in the direction of transport T. Sheets of paper, following each other and each encountering the upright stop surfaces 66, are stacked in front of the upright stop surfaces 66 in the transport direction T. At the paper-catching position, the piston rod 61 of the pneumatic cylinder 81 forming the driver 59 of the paper-catching device 58 retracts by applying compressed air to the pneumatic cylinder 81, and the end point E2 of the connecting member 63 opposite to the driver 59 of the paper-catching device 58 occupies its closest position to the driver 59 of the paper-catching device 58 on the track 64.

[0064] Figure 7 Show Figure 2 A partial view showing a crossover belt 48, which is shown in its operating state, protruding upwards at an acute angle from the previous feed plane E19 of the suction belt table 19 at an angle along the sheet-carrying direction T, and a paper-catching blower 51, activated, for example, by a control unit 71, the activation of which occurs in... Figure 7 The blowing direction is indicated by the arrow pointing to the feeding plane E19 of the suction belt table 19.

[0065] If a shutdown occurs, specifically a serious malfunction in a processing station, such as a coating unit 22, located after the suction belt table 19 in the machine structure, necessitating a sudden interruption of the transfer of single sheets of paper to the conveyor located after the suction belt table 19, then the paper-grabbing device 58 switches its paper-grabbing position. This is done by the control unit 71, typically which also controls other functions, preferably all functions of the suction belt table 19, operating automatically, particularly with programmed control. The control unit 71 also controls, for example, the valve of the blow box 37. Figure 2 While operating the paper-grabbing device 58, the conveying speed of a single sheet can be reduced, for example, by reducing the corresponding conveying speed of a conveying device located before the paper-grabbing device 58 in the conveying direction T of the single sheet. Even if the conveying speed of the conveying device located before the paper-grabbing device 58 in the conveying direction T of the single sheet is not immediately reduced when the paper-grabbing device 58 is operated, in any case the low pressure generated in the suction chamber 41 involved by means of the suction device 72 controlled by the control unit 71 is closed or stopped, wherein the suction chamber 41 is fluidly connected to the switching area 52 involved by means of suction holes 53 constructed in the feed plane E19 of the suction belt table 19 and overlaps at least partially with the envelope of the stack to be formed of the single sheet to be captured. Then, at least one stop surface 66 of the paper-grabbing device 58 is injected into the single sheet gap between the rear edge of the previous single sheet and the front edge of the first subsequent single sheet to be captured. For this purpose, the control unit 71 operates at least one pneumatic switching valve 86, preferably two pneumatic switching valves 86 simultaneously; 87, causing the piston rod 61 of the pneumatic cylinder 81 that forms the driver 59 of the paper-catching device 58 to retract.

[0066] In an advantageous embodiment, the pneumatic cylinder 81 has a bottom chamber 68 and a storage chamber 69 separated from the bottom chamber 68 by a cylinder piston 82 rigidly connected to the piston rod 61, and a first pneumatic switching valve 86 is connected to the bottom chamber 68, and a second pneumatic switching valve 87 is connected to the storage chamber 69. These two switching valves 86 and 87 are respectively controlled by a control unit 71 of the paper-catching device 58. In a first embodiment variant, the bottom chamber 68 may have atmospheric pressure. In another second embodiment variant, the bottom chamber 68 may have a pressure differential greater than atmospheric pressure and less than the pressure in the storage chamber 69. In a preferred embodiment, the piston rod 61 of the pneumatic cylinder 81 forming the actuator 59 of the paper-catching device 58 retracts, for example, at 7 bar. When the piston rod 61 of the pneumatic cylinder 81 retracts, the cylinder piston 82 performs work on compressed air preloaded, for example, at 2 bar, in the bottom chamber 68. This compressed air can escape in a throttled manner through the open pneumatic switching valve 86 of the bottom chamber 68 and, if necessary, through the adjacent throttle valve 91. The braking effect of this back pressure begins only relatively late, so that the movement of the cylinder piston 82, and consequently the piston rod 61, initially experiences very large acceleration and the resulting velocity. Afterward, the movement of the cylinder piston 82 is braked at its end by an effectively compressed air column, and the residual velocity at the end position buffer elements 83; 84 of the pneumatic cylinder 81 is braked. This very rapid movement of the cylinder piston 82 is transferred with great force by the crank 62 to the coupling 63 arranged in the central thrust crank position, preferably having a transmission ratio of at least 1:5 (i = 0.2) that converts to faster motion.

[0067] Using the proposed crank-slider drive, at least one stop surface 66 of the paper-grabbing device 58 can be achieved even at high conveying speeds of several thousand sheets per hour, for example, approximately 10,000 sheets per hour being fed into the paper-grabbing position through a sheet gap of, for example, only about 20 mm. The response time achievable using the proposed crank-slider drive is significantly longer than the switching time of a simple flipping and / or pushing mechanism, which is driven, for example, by a switching magnet or directly, i.e., without a transmission component, by a pneumatic cylinder 81. Another advantage of this solution is that the proposed crank-slider drive is relatively simple and space-saving.

[0068] Thus, a machine structure is obtained having multiple processing stations for processing individual sheets of paper, the processing stations being arranged sequentially in the sheet-feeding direction T, wherein at least one of the processing stations has a conveying device 18 for conveying individual sheets of paper flat along a straight conveying section, wherein the conveying device 18 is designed to convey individual sheets of paper sequentially following each other through gaps, wherein a suction belt table 19 is arranged behind the conveying device 18 for conveying individual sheets of paper flat along the straight conveying section. In this embodiment, the suction belt table 19 has a paper-grabbing device 58, which has an operation-based grabbing position for individual sheets of paper that follow each other sequentially. In this grabbing position, the sheet of paper conveyed to the suction belt table 19 by the corresponding conveyor 18 is grabbed and stacked on the suction belt table 19 before being transferred to a conveyor arranged after the suction belt table 19, wherein the conveyor conveys the sheet of paper horizontally along a straight conveyor section and is arranged before the suction belt table 19. A control unit 71 for the suction belt table 19 operates the paper-grabbing device 58 according to a fault occurring in a processing station arranged after the suction belt table 19, causing the paper-grabbing device 58 to occupy its grabbing position. In a preferred embodiment, the conveyor 18, which horizontally conveys the sheet of paper along a straight conveyor section and is arranged before the suction belt table 19, is part of the dryer 17. The dryer 17 is arranged, for example, after the processing station designed as a printoutless printing apparatus 13. The suction belt table 19 is also preferably arranged before the processing station designed as a coating apparatus 22, particularly as a painting apparatus. Here, the coating apparatus 22, as a conveying device for the sheets to be conveyed, particularly has a conveyor roller 23, wherein a printing roller 24 is preferably coupled to the conveyor roller 23, the printing roller having an inking roller 26 that is in contact with or at least can be in contact with the printing roller 24, wherein at least one blade 27 or a chamber blade system 27 extends in the axial direction of the inking roller 26. This machine structure is designed to convey sheets at a conveying speed preferably several thousand sheets per hour, particularly about 10,000 sheets per hour. A conveyor 18, arranged before the suction belt table 19 and horizontally conveying sheets along a straight conveying section, is designed to convey individual sheets following each other sequentially, preferably with a sheet gap of approximately 20 mm.

[0069] This results in a suction belt table 19 for conveying single sheet-like substrates that are to be laid flat individually. The suction belt table 19 is arranged between a conveyor device arranged in front and a corresponding conveyor device arranged behind along the conveying direction T of the substrate. The suction belt table 19 has a paper-grabbing device 58, which has a paper-grabbing position occupied by the device for individual substrates that follow each other in sequence, based on its operation. In its paper-grabbing position, the paper-grabbing device 58 captures the substrates that have been conveyed to the suction belt table 19 by the previous conveyor device before they are transferred to the conveyor devices arranged behind the suction belt table 19, that is, prevents the movement process along the conveying direction T and preferably stacks them. Here, the conveyor arranged before the suction belt table 19 has a translational conveying section for individually laying and conveying single sheets of paper substrate, and / or the conveyor arranged after the suction belt table 19 has a rotary or translational conveying section for conveying single sheets of paper substrate. In particular, a digital control unit 71 is provided, which operates the paper-grabbing device 58 according to a fault occurring along the conveying section of the conveyor arranged after the suction belt table 19, causing the paper-grabbing device 58 to occupy its paper-grabbing position. The gripping device 58 has at least one pivotable stop surface 66 for gripping a substrate. When the gripping device 58 is not operated by the control unit 71, the stop surface 66 is arranged below the feed plane E19 of the suction belt table 19. When the gripping device 58 is operated by the control unit 71, it is erected perpendicular to the feed plane E19 by pivoting through an opening 67 in the feed plane E19, such that the substrate conveyed on the suction belt table 19 comes into contact with at least one erected stop surface 66 extending from the feed plane E19. In a preferred embodiment, the paper gripping device 58 has a sliding crank mechanism, wherein the sliding crank mechanism has a coupling 63 and a crank 62 cooperating with the coupling 63, the crank 62 being driven by a driver 59. Crank 62 is rotatably supported on a rotation point D62 fixedly arranged in the suction belt table 19. Crank 62 is designed as an angled rod and has a short rod and a longer rod compared to the short rod. The short rod connects hinge point G61 to the rotation point D62 of crank 62. A drive 59 acts on crank 62 at hinge point G61. The longer rod of crank 62 extends between its rotation point D62 and hinge point G62, which connects crank 62 to coupling member 63. The length ratio of the short rod and the longer rod of crank 62 is such that the motion from the drive 59 of the paper gripping device 58 acting on the coupling member 63 is converted into a faster motion. The transmission ratio i for this faster motion is preferably at least 1:5.The end point E2 of the connector 63 opposite to the driver 59 of the paper gripping device 58 is capable of bidirectional linear movement along a trajectory 64 arranged parallel to the feed plane E19 of the suction belt table 19. The end point E2 of the connector 63 opposite to the driver 59 of the paper gripping device 58 and the rotation point D62 of the crank 62 are arranged on a straight line G64 connecting these two points, which extends parallel to the feed plane E19 of the suction belt table 19. At least one stop surface 66 for the substrate to be gripped is constructed in the region between the end point E1 of the connector 63 facing the driver 59 of the paper gripping device 58 and the hinge point G62 where the crank 62 connects to the connector 63. The crank-slider drive preferably has a central crank-slider, wherein the three line segments G62-D62; G62-E2; G62-E1 are designed to be of equal length, and the endpoints E1; E2 of the connecting member 63, together with the hinge point G62 arranged therebetween, are all arranged on the straight line G63 connecting the endpoints E1; E2 of the connecting member 63. The actuator 59 of the paper-catching device 58 is advantageously designed as a double-acting pneumatic cylinder 81, wherein the pneumatic cylinder 81 has a bottom chamber 68 and a storage chamber 69, the storage chamber 69 being separated from the bottom chamber 68 by a cylinder piston 82, the cylinder piston 82 being fixedly connected to its piston rod 61. Here, the storage chamber 69 is arranged at the end of the pneumatic cylinder 81 facing the hinge point G61, at which the actuator 59 acts on the crank 62. A bottom chamber 68 is located at the end of the pneumatic cylinder 81 opposite to the hinge point G61, where the actuator 59 acts on the crank 62. A first pneumatic switching valve 86 is connected to the bottom chamber 68, and a second pneumatic switching valve 87 is connected to the storage chamber 69. These two valves 86 and 87 are controlled by the control unit 71 of the paper-catching device 58. The bottom chamber 68 has atmospheric pressure, or a pressure differential greater than atmospheric pressure and less than the pressure in the storage chamber 69. The piston rod 61 of the pneumatic cylinder 81 retracts when a pressure of, for example, 7 bar is applied to the storage chamber 69. When the piston rod 61 of the pneumatic cylinder 81 retracts, the piston 82 of the pneumatic cylinder 81 performs work on compressed air preloaded in the bottom chamber 68, for example, at 2 bar, provided by a compressed air source 93 connected to the bottom chamber 68.

[0070] A suction belt table 19 for conveying individual sheet-like substrates laid flat in a feed plane E19 was also developed, wherein the suction belt table 19 has a paper gripping device 58 and at least one crossover belt 48, the paper gripping device 58 and at least one crossover belt 48 being designed to selectively occupy one of two different operating states under the control of a control unit 71, respectively. The first operating state is an inactive operating state, and the second operating state is an active operating state, with the paper gripping device 58 having at least one crossover belt 48 in its active state. A stop surface 66, perpendicular to the feed plane E19 of the suction belt stage 19, is erected for capturing a substrate. At least one crossover belt 48 is arranged in the conveying direction T of the substrate, extending at least one substrate length in the conveying direction T, in front of at least one stop surface 66 perpendicular to the feed plane E19 of the suction belt stage 19. In its active state, at least one crossover belt 48 is pivotally rotated out of the feed plane E19 of the suction belt stage 19 with its end pointing in the conveying direction T of the substrate at an acute angle opening in the conveying direction T of the substrate. Here, the suction belt table 19 is arranged between a conveying device arranged in front along the conveying direction T of the substrate and a corresponding conveying device arranged behind it. The conveying device arranged in front of the suction belt table 19 has a translational conveying section for conveying a single sheet of paper substrate that is to be conveyed flat, and / or the conveying device arranged behind the suction belt table 19 has a rotational conveying section or a translational conveying section for conveying a single sheet of paper substrate that is to be conveyed flat. Advantageously, a paper-catching blower 51 is arranged above the feed plane E19 of the suction belt table 19 in the region extending along the substrate conveying direction T between the vertical stop surface 66 of the paper-catching device 58 and at least one crossover belt 48. The crossover belt 48 is pivotally turned upward at an acute angle from the feed plane E19. The paper-catching blower 51 has a plurality of blowing nozzles arranged in rows extending transversely to the substrate conveying direction T. In its active state, the paper-catching blower 51 blows air from its blowing nozzles, for example vertically toward the feed plane E19 of the suction belt table 19.The control unit 71 operates the paper-catching device 58 according to a fault occurring along the conveying section of the conveyor belonging to the conveyor after the suction belt table 19, such that the paper-catching device 58 erects at least one of its stop surfaces 66 for the substrate to be caught perpendicular to the feed plane E19 of the suction belt table 19, and / or the control unit 71 operates at least one crossover belt 48 according to a fault occurring along the conveying section of the conveyor belonging to the conveyor arranged after the suction belt table 19, such that at least one crossover belt 48 pivots upward at an acute angle away from the feed plane E19 of the suction belt table 19, and / or the control unit 71 operates the paper-catching blower 51 according to a fault occurring along the conveying section of the conveyor belonging to the conveyor arranged after the suction belt table 19, such that the paper-catching blower 51 blows blowing air from its nozzle toward the feed plane E19 of the suction belt table 19. The suction belt table 19 is preferably designed such that a blow box 37 belonging to the lower overlapping device of the suction belt table 19 is arranged above the feed plane E19 of the suction belt table 19, after the paper gripping device 58, in the substrate conveying direction T. Additionally, in the substrate conveying direction T, before at least one crossover belt 48, at the transition portion from the conveying device suction belt table 19z arranged before the suction belt table 19, a guide device 42 extending transversely to the substrate conveying direction T is arranged, for example, with a plurality of lifting nozzles 43. Furthermore, in the region extending between at least one vertical stop surface 66 of the paper gripping device 58 and at least one crossover belt 48 in the conveying direction T of the substrate below the feed plane E19 of the suction belt table 19, for example, at least one suction chamber 41 is arranged, the crossover belt 48 pivoting upward at an acute angle away from the feed plane E19 of the suction belt table 19. The suction chambers 41 involved are adjusted, or at least adjustable, in terms of their respective pressures by the control unit 71, which adjusts or at least adjusts to a low pressure through suction holes 53 constructed in the suction feed plane E19 leading to the suction chambers 41 involved in the feed plane E19 of the suction belt table 19. When a malfunction occurs along the conveying path belonging to the conveyor arranged after the suction belt table 19, the low pressure adjusted in the feed plane E19 of the suction belt table 19 by means of the suction chambers 41 is cut off. The control unit 71 is preferably designed to reduce the conveying speed of the substrate at least in the conveying device located before the paper gripper 58 in the conveying direction T of the substrate. Preferably, two parallel bridging belts 48 are provided in the conveying direction T of the single sheet, each in the form of a rotating loop, wherein the two bridging belts 48 are arranged symmetrically with respect to the centerline M of the feed plane E19 of the suction belt table 19.

[0071] The following assumes that the pneumatic actuator 59, controlled by the control unit 71, operates the paper-grabbing device 58. As already shown, in the case of shutdown operation, due to the high conveying speed of several thousand sheets per hour, for example, about 10,000 sheets per hour, conveyed in the feed plane E19 of the suction belt table 19, and due to the relatively small gap, for example, only about 20 mm, between individual sheets that follow each other along its conveying direction T, it is necessary that at least one stop surface 66 of the paper-grabbing device 58 is erected in the feed plane E19 of the suction belt table 19 in a very short time, and then injected into the straight conveying section of the sheet, so as to effectively prevent the transfer of additional sheets of paper that continue to be conveyed to the suction belt table 19 after at least one stop surface 66 of the paper-grabbing device 58 has been erected to the curved, especially arcuate, conveying section of the conveyor arranged after the suction belt table 19. During these short switching times, the piston 82 in the pneumatic cylinder 81 applies such large force pulses to the internal stops of the pneumatic cylinder 81 based on the acquired kinetic energy that these stops wear and are thus destroyed in a very short time. In this regard, an improved cushioning solution for the internal stops of the pneumatic cylinder 81 is needed, so that the pneumatic cylinder 81 has sufficient wear resistance and therefore as long an unrestricted operating time as possible when used as described above.

[0072] As from Figure 8 As can be seen, it is therefore proposed that a pneumatic circuit be provided for the operation of the double-acting pneumatic cylinder 81 of the paper-grabbing device 58, which controls the movement of the cylinder piston 82 in such a way that the cylinder piston 82 has a positive acceleration in the first half of its stroke and a negative acceleration in the second half after the first half. Here, the pneumatic cylinder 81 has a bottom chamber 68 and a storage chamber 69 separated from the bottom chamber 68 by the cylinder piston 82, and the cylinder piston 82 is firmly connected to the piston rod 61. The storage chamber 69 is arranged at the end of the pneumatic cylinder 81 facing the hinge point G61, and the actuator 59 acts on the crank 62 at the hinge point G61. The bottom chamber 68 is arranged at the end of the pneumatic cylinder 81 away from the hinge point G61, and the actuator 59 acts on the crank 62 at the hinge point G61. The cylinder piston 82 preferably has end position buffer elements 83; 84 on both sides. The pneumatic circuit described in detail below achieves controlled acceleration and controlled braking phases throughout the entire stroke of the piston 82 by altering the dynamic pressure balance in the two chambers 68 and 69 of the pneumatic cylinder 81.

[0073] The pneumatic circuit has a first pneumatic switching valve 86 and a second pneumatic switching valve 87, wherein the two switching valves 86 and 87 are preferably electrically operated by the control unit 71. The two switching valves 86 and 87 are respectively connected to their respective compressed air sources 93 in one of their switching positions. Figures 9 to 12The pneumatic cylinder 81 is shown in the following operating position, in which the piston rod 61 of the pneumatic cylinder 81, which forms the driver 59 of the paper-grabbing device 58, retracts and thus the paper-grabbing device 58 is activated. This means that the stop surface 66 of the paper-grabbing device 58 is erected in the feed plane E19 of the suction belt table 19. A pressure reducer 88 is preferably arranged at least before the switching valve 86 for the bottom chamber 68 to establish a defined initial back pressure in the bottom chamber 68 when compressed air flows out. However, the pressure reducer 89 can also be connected before the switching valve 87 for the storage chamber 69. Additionally, a throttle valve 91 is arranged after the switching valve 86 for the bottom chamber 68 so that the flow rate of compressed air from the bottom chamber 68 can be influenced by the throttle valve 91, which is preferably adjustable in cross-section, thereby affecting the dynamic pressure profile in the pneumatic cylinder 81 and consequently the speed of the cylinder piston 82. For example, it can also be configured such that a throttle valve 92 is provided at the outlet of the storage chamber 69 of the pneumatic cylinder 81 to limit the speed of the cylinder piston 82. The throttle valve 91 of the bottom chamber 68 and, if necessary, the throttle valve 92 of the storage chamber 69 are only used when compressed air flows out of the respective chambers 68 and 69 into the atmosphere.

[0074] Before the paper-catching device 58 is activated, the storage chamber 69 of the pneumatic cylinder 81 is preferably depressurized, i.e., the pressure present is, for example, equal to atmospheric pressure. However, in an alternative embodiment, the storage chamber 69 of the pneumatic cylinder 81 can also be configured such that it is loaded with a pressure greater than atmospheric pressure, for example, a pressure equivalent to the pressure in the bottom chamber 68, i.e., preferably, 2 bar. If the pressures adjusted in the two chambers 68; 69 are equal, the cylinder piston 82 remains in a stable end position. In the bottom chamber 68, which is preloaded with, for example, compressed air at 2 bar, an air volume that can be controlled by pressure is provided, which is required to brake the traveling motion of the cylinder piston 82 when the paper-catching device 58 is operated. The activation of the paper-catching device 58 and the process of injecting its at least one stop surface 66 into the single-sheet gap between the rear edge of the previous sheet and the leading edge of the first subsequent sheet to be caught are achieved by the simultaneous operation of two switching valves 86; 87 by the control unit 71. Thus, the storage chamber 69 is filled with compressed air greater than 5 bar, particularly 7 bar, by its compressed air source 93, and the air in the bottom chamber 68, preloaded at about 2 bar, can now escape to the atmosphere under the control of the throttle valve 91. This creates a pressure difference of about 5 bar after a very short time, generating a corresponding force at the cylinder piston 82, causing it to move. The braking effect is controlled by the amount of air compressed in the storage chamber 69 and the opening cross-section of the throttle valve 91, such that the movement of the cylinder piston 82 initially achieves a very large acceleration, after which this movement of the cylinder piston 82 is braked as much as possible by the actively loaded air column at the end, and only a residual velocity less than, for example, 10% of the maximum possible velocity previously reached on the end position buffer element 83 of the pneumatic cylinder 81 is braked. When the paper-catching device 58 is activated, the cylinder piston 82 accelerates in the first half of its stroke and brakes in the second half. In the first half of its stroke, the cylinder piston 82 reaches its maximum possible speed. Ideally, the cylinder piston 82 would reach its corresponding end position with zero speed. However, this is not achieved in actual operation. Therefore, a small amount of residual energy remains at the corresponding end position buffer elements 83; 84 and must be dissipated. This very rapid motion of the cylinder piston 82 is transmitted from the crank 62 in a strongly driven manner to the coupling 63, which is preferably located in the center thrust crank position.

[0075] By utilizing the pneumatic circuit described and the pressure setting mentioned as an example, even at the aforementioned high conveying speeds of single sheets, at least one stop surface 66 of the paper gripper 58 can be fed into the gripping position through the aforementioned very narrow single sheet gap. The solution shown advantageously avoids high impact loads and load peaks throughout the motion system. This is because the loaded air column, particularly in the bottom chamber 68, effectively prevents damage to the bottom of the cylinder by cushioning the drive motion of the cylinder piston 82 at its end. Furthermore, the safe end position of the cylinder piston 82 in its retracted state is achieved without additional mechanical components and at no additional cost. The pressure reduction in the storage chamber 69 also achieves energy savings and reduces potential leakage.

[0076] Figure 9 For example, a graph showing the time t on the horizontal axis can be used to illustrate the characteristics of some physical quantities related to the piston 82 of the pneumatic cylinder 81 during the switching process, at which time the paper-grabbing device 58 of the suction belt table 19 involved moves from its starting position to its paper-grabbing position, especially when operated by the control signal of the control unit 71. Figure 10 The positional change of cylinder piston 82 between its two end positions in pneumatic cylinder 81 is shown. The stroke z is adjusted, and thus the stroke of cylinder piston 82 is shown here, for example, as 10 mm. Figure 11 The speed v of cylinder piston 82 during its movement along the adjustment stroke z is shown as an example. Figure 12 The example illustrates the acceleration a, which the cylinder piston 82 utilizes to perform its motion along the adjustment stroke z. Then, in Figure 2 The diagram also shows, for example, the piston force F applied by cylinder piston 82.

[0077] As described above, a suction belt table 19 for conveying individual sheet-like substrates laid flat in a feed plane E19 is obtained. The suction belt table 19 has a paper-catching device 58, which has at least one stop surface 66 erected in its paper-catching position in the feed plane E19 of the suction belt table 19 for catching the substrate. The at least one stop surface 66 is erected from the inactive starting position of the paper-catching device 58 by a double-acting pneumatic cylinder 81 by moving its piston 82 to the paper-catching position. The pneumatic cylinder 81 has a bottom chamber 68 and a storage chamber 69 separated from the bottom chamber 68 by the piston 82. A pneumatic circuit is provided for controlling the movement of the piston 82. The pneumatic circuit has a first pneumatic switching valve 86 connected to the bottom chamber 68 and a second pneumatic switching valve 87 connected to the storage chamber 69. The two switching valves 86 and 87 are preferably electrically operated by a control unit 71. Here, as described above, the paper-grabbing device 58 has a push crank mechanism driven by the piston 82 of the pneumatic cylinder 81. The movement of the piston 82 is controlled by the control unit 71 in such a way that a positive acceleration is adjusted for the piston 82 in the first half of its stroke, and a negative acceleration is adjusted for the second half of its stroke following the first half. A pressure reducer 88 is connected at least before the first switching valve 86 connected to the bottom chamber 68. At least after the first switching valve 86 connected to the bottom chamber 68, a throttle valve 91, preferably adjustable in its opening cross-section, is also arranged, for example. Here, the opening cross-section of the throttle valve 91 is adjusted, for example, by the control unit 71, such that the movement of the piston 82 at the end of the second half of its stroke has a residual velocity less than 10% of the maximum velocity previously reached in the first half of its stroke. The piston 82 preferably has end position buffer elements 83; 84 on both sides, wherein the residual velocity of the piston 82 at the end of its second half stroke is braked at the relevant end position buffer elements 83; 84. In the inactive starting position of the paper gripping device 58, at least the bottom chamber 68 of the pneumatic cylinder 81 is loaded with a pressure greater than atmospheric pressure, preferably, for example, 2 bar. To adjust the paper gripping position of the paper gripping device 58, the control unit 71 switches the first switching valve 86 connected to the bottom chamber 68 to a position that discharges air from the bottom chamber 68, and simultaneously switches the second switching valve 87 connected to the storage chamber 69, thereby loading the storage chamber 69 with compressed air at a pressure greater than 5 bar.

[0078] Combination Figure 13The document describes a suction belt stage 19 having a switching region 52 extending along the sheet-fed transport direction T in its feed plane E19. This switching region 52 has a plurality of suction holes 53, wherein, preferably below the feed plane E19 of the suction belt stage 19, a plurality of suction chambers 41 are arranged, each controllable in its respective fluidic action. These suction chambers 41 are preferably arranged sequentially to each other in the sheet-fed transport direction T, and are particularly capable of being switched individually and independently in terms of their respective pressures, or at least switchable. It also describes that the suction holes 53 in the switching region 52 form a fluid connection with at least one of the plurality of suction chambers 41 preferably arranged below the feed plane E19 of the suction belt stage 19, in which a low pressure is adjusted, or at least adjustable, at the suction holes 53 in the feed plane E19 of the suction belt stage 19 by means of a suction device 72 controlled by a control unit 71. This low pressure ensures that individual sheets of paper resting on at least one conveyor belt 54 in the feed plane E19 of the suction belt table 19 are held in a friction-locked or force-locked manner. This is because the switching area 52 at least partially overlaps with the envelope of the individual sheet to be captured. The conveyor belt 54 involved is designed, for example, as a circulating or looping suction belt, with at least segments having perforations, so that the low pressure adjusted at the suction holes 53 in the feed plane E19 of the suction belt table 19 can be applied by the conveyor belt 54 to the flat individual sheets of paper. The conveyor belt 54 is preferably designed as a flat belt or flat belt.

[0079] If a shutdown occurs and at least one stop surface 66 of the paper gripper 58 moves to its gripping position, the frictional or force-locked engagement between the corresponding conveyor belt 54 and the flat sheet must be released within a very short time. Otherwise, when the sheet resting on the conveyor belt 54 is pushed together, it will be wrinkled, upon impact with at least one stop surface 66 of the paper gripper 58 extending from the feed plane E19 of the suction table 19. At a conveying speed of several thousand sheets per hour, for example, approximately 10,000 sheets per hour, it is impossible to release the low pressure adjusted there in the suction chamber 41 by means of the suction device 72 controlled by the control unit 71 within the required short time. Consequently, it is also impossible to release the holding force acting on the sheet resting on the corresponding conveyor belt 54, nor is it possible to stop the conveyor belt 54 itself in time before the sheet impacts at least one stop surface 66 of the paper gripper 58. Therefore, in order to avoid the single sheet of paper resting on the corresponding conveyor belt 54 and first hitting the stop surface 66 extending from the feed plane E19 of the suction belt table 19 when a stop occurs, it is necessary to release the aforementioned friction lock or force lock more quickly than to close the suction device 72 of the suction chamber 41 involved and / or to stop the conveyor belt 54 involved.

[0080] Therefore, as from Figures 1 to 3It can be proposed that at least one pneumatic timing valve 74, controlled by a control unit 71, is arranged in the inlet pipe 73 that pneumatically connects the relevant suction chamber 41 to the corresponding suction port 53. The timing valve 74 interrupts the pneumatic connection when the paper-grabbing device 58 enters its paper-grabbing position. In a preferred embodiment, the timing valve 74 is designed such that, simultaneously with the interruption of the pneumatic connection between the relevant suction chamber 41 and the corresponding suction port 53, a section of the inlet pipe 73 between the timing valve 74 and the corresponding suction port 53 is vented at atmospheric pressure or at a pressure 3% to 10%, preferably 5%, higher than atmospheric pressure. The conveying speed of a single sheet corresponds to the cycle time for consecutive sheets to reach the position of at least one stop surface 66 of the paper-grabbing device 58 extending from the feed plane E19 of the suction belt table 19. The switching time of the involved cycle valve 74 is set shorter than the cycle time of adjacent sheets of paper following each other, and preferably in the range of 20 ms to 100 ms, particularly 40 ms. The switching time of the involved cycle valve 74 is from the time of its operation until the corresponding time point when the involved cycle valve 74 stably changes from its first operating position to its second operating position. The control unit 71 is preferably designed such that it places the involved cycle valve 74 in a state of interrupting the pneumatic connection between the involved suction chamber 41 and the corresponding suction port 53 for a duration of one cycle time before the operation of the paper gripper 58.

[0081] The advantage of the solution is that, when the brake is engaged, the first sheet of paper captured by the paper catcher 58 is not pushed together or wrinkled. Instead, at least one timing valve 74, controlled by the control unit 71, is arranged in the inlet pipe 73 between the suction chamber 41 and the corresponding suction port 53, ensuring that the V-catching process is independent of the inevitable operation of at least one conveyor belt 54 after the stop is detected and / or the continuous suction action of the suction chamber 41.

[0082] If already Figure 14As shown, multiple sheets of paper are conveyed to the suction belt 19 by a conveyor arranged immediately in front of the suction belt 19. These sheets of paper are individually laid flat in the conveyor and on the suction belt 19, and are conveyed sequentially along straight conveyor sections with narrow gaps between them. Here, in a preferred embodiment, the conveying of these sheets is achieved by means of a plurality of conveyor belts arranged sequentially in the sheet conveying direction T, starting from a rotating conveyor belt 18 of a conveying device immediately preceding the suction belt table 19, via at least one receiving belt 44 belonging to the suction belt table 19, the receiving belt being, for example, designed as a rotating flat belt preferably arranged in the middle region of the feed plane E19 of the suction belt table 19, wherein, in the sheet conveying direction T, after the receiving belt 44, for example, two parallel crossover belts 48 arranged in the form of rotating loop belts are arranged, followed by at least one conveyor belt 54 particularly designed as a suction belt, and for example, two parallel brake belts 56 arranged in the form of rotating loop belts. For example, at each transition of the rotating circular belt, such as at the transition between two machine units that follow each other, such as from the blank printing unit 13 or from the dryer 17 or from the suction belt table 19 to the corresponding different machine unit (at least one of these machine units has a conveyor in the form of a rotating circular belt), to the conveyor following the conveyor belt in the direction of sheet transport T, in the sheet feed plane E19, there is a gap with a width (e.g., in the range of 1 mm to 5 mm) that is larger than the thickness of the sheet, created by the deflection roller 76 rotating with the conveyor belt in the feed plane E19, and there is an interruption 78 in the mechanical support of the sheet to be transported, which is at risk of operational interruption at high transport speeds of several thousand sheets per hour, such as about 10,000 sheets per hour. Because when conveying single sheets of paper resting on a rotating belt, there is a risk that the leading edge of the sheet, at the end of the conveyor section given by the conveyor belt, may turn into the interruption 78 due to its adhesion to the conveyor belt, which is deflected at the end by means of the deflection roller 76. This prevents further conveying of the sheet and makes it an obstacle to subsequent sheets. This problem is particularly present at all transition sections if at least one of the conveyor belts acting at the transition section has a width extending transversely to the conveying direction T of the sheet of paper that is at least 25% of the width of the sheet to be conveyed. In a preferred embodiment, this also occurs, for example, at the transition between the conveyor device, such as that belonging to the dryer 17, immediately preceding the suction belt table 19.

[0083] Therefore, it is proposed that pneumatic pressure be used instead of the interruption 78 of the mechanical support portion of the sheet paper to be conveyed in the feed plane E19. This is achieved by arranging a guide device 42 extending transversely to the sheet paper conveying direction T at the transition from the conveyor device, for example, immediately adjacent to the suction belt table 19, to the suction belt table 19. This guide device preferably has a plurality of lifting nozzles 43 arranged in at least one row. The guide device 42, which itself has a plurality of lifting nozzles 43, is arranged along the sheet paper conveying direction T, particularly before at least one crossover belt 48, at the transition from the conveyor device, for example, to the suction belt table 19. In an advantageous embodiment, the deflection roller 76 arranged at the interruption 78 has, for example, a plurality of nozzle-shaped openings on its shell surface, from which compressed air jets are ejected, one of which is directed in the direction of at least one lifting nozzle 43.

[0084] Figure 3 For example, a top view is shown, for example, in combination. Figure 15 A partial view of the suction belt table 19 is shown. A sheet-like substrate, preferably a printed sheet (referred to as sheet 77), is laid flat on a conveyor belt 18, for example, belonging to the dryer 17, and transferred to the suction belt table 19 on a feed plane E19 according to its translational movement. Below the feed plane E19 of the suction belt table 19, and preferably flush with the upward-facing end of the feed plane E19, is a rotating deflection roller 76 that moves the conveyor belt 18 along the conveying direction T of the sheet 77 and deflects it at the end of a conveying device immediately preceding the suction belt table 19. At its transition from the conveying device immediately preceding the suction belt table 19 to the suction belt table 19, the sheet 77 must overcome an interruption 78 in its mechanical support located in the feed plane E19. The transferred sheet of paper 77 is captured, for example, by a receiving belt 44 belonging to a suction belt table 19, wherein the receiving belt 44 is designed, for example, as a flat, rotating belt and / or suction belt arranged in the central region of the feed plane E19 of the suction belt table 19. Following the receiving belt 44 in the transport direction T of the sheet of paper 77 are, for example, two crossover belts 48 arranged parallel to each other, for example, in the form of rotating loop belts.

[0085] Figure 1A guide device 42, arranged at an interruption 78 associated with the mechanical support of the sheet of paper 77 to be conveyed, is schematically and in a greatly simplified manner. This guide device has at least one lifting nozzle 43, preferably multiple lifting nozzles 43, wherein the interruption 78 is, for example, arranged between the rotating conveyor belt 16 belonging to the printout unit 13 and the rotating conveyor belt 18 belonging to the dryer 17. Due to the rotation of the deflection roller 76, the sheet of paper 77 conveyed in the conveying direction T is easily pulled along its leading edge into the interruption 78 located on the periphery of the deflection roller 76 and extending laterally in the conveying direction T of the sheet of paper 77, thus causing an interruption in operation. This interruption 78 in the mechanical support of the sheet of paper 77 to be conveyed is as follows: Figures 16 to 19 In the example shown, in a digital printing press with a sheet 77 laid flat, the sheet is located in multiple positions, such as at the transition to and from the non-printing plate printing unit 13 and the corresponding transition thereafter, and at the transition from the dryer 17 to the suction belt table 19.

[0086] Figure 16 In conjunction with a digital printing press in which sheet-fed paper 77 is laid flat, the working principle of the guide device 42 arranged in such an interruption 78 is explained at the transition point where the sheet-fed paper 77 moves from the printout unit 13 to the dryer 17 immediately following one of the printout units 13. These explanations are also reasonably applicable to all other locations in the machine structure of the proposed digital printing press where such guide devices 42 are arranged, or at least can be arranged.

[0087] Figure 17The initial state of the guiding device 42 arranged at the interruption point 78 is shown. A sheet of paper 77 placed on the rotating conveyor belt 16 belonging to the printout printing apparatus 13 reaches the interruption point 78 with its leading edge. The interruption point is located at the transition of the sheet of paper 77, for example, from the conveyor belt 16 of the printout printing apparatus 13 to the dryer 17, on the conveyor belt 18 immediately following the printout printing apparatus 13. The guide device 42 has a pointed, tapering profile element 79 extending transversely to the conveying direction T of the sheet 77. This profile element is preferably in the form of a scraper. The tip of the profile element 79 is preferably arranged approximately tangentially opposite to the conveying direction T of the sheet 77 towards the conveyor belt 16 of the non-printing printing apparatus 13. The tip of the profile element 79 is preferably separated from the conveyor belt 16 of the non-printing printing apparatus 13, which is deflected on a rotating deflection roller 76, by a gap having a width, for example, in the range of 1 mm to 5 mm, greater than the thickness of the sheet 77. Within the profile element 79, there is at least one lifting nozzle 43 opening in the direction of its tip. This lifting nozzle 43 allows the guide device 42 (i.e., its at least one lifting nozzle 43) to be activated, for example, under the control of the control unit 71. Figure 17 The air jet, indicated by the directional arrow, points towards, or at least may point towards, the conveyor belt 16 of the printout apparatus 13, which is deflected on the deflection roller 76. Figure 16 With the guide device 42 activated as shown, the single sheet of paper 77 placed on the conveyor belt 16 of the non-printing plate printing device 13 is deflected by the rotation of the deflection roller 76 compared to... Figure 18 The initial state shown is getting closer and closer to the gap designed for the guide device 42, in which the leading edge of the sheet 77 involved continues to follow the curvature of the deflection roller 76 in a way that could cause operational failure.

[0088] As from Figure 19 and Figure 18As can be seen, when the guide device 42 is activated, an air jet blown from at least one lifting nozzle 43 arranged in the profile element 79 flows toward the conveyor belt 16 of the non-printing plate printing apparatus 13, which is deflected on the deflection roller 76. Here, the air jet encounters the conveyor belt 16 such that the direction of the core jet intersects the circumference of the deflection roller 76 as a secant. In addition, the air jet is directed toward the conveyor belt 16 such that the free upper boundary of the air jet facing the leading edge of the sheet of paper 77 involved neither intersects nor crosses the tangent between the circumference of the deflection roller 76 and the lifting nozzle 43 involved in the guide device 42. The air jet directed toward the convex surface of the conveyor belt 16 deflected on the deflection roller 76 of the non-printing plate printing apparatus 13 is deflected there by the curvature of the deflection roller 76 toward the leading edge of the sheet of paper involved. Due to the Coanda effect, the air jet following the curvature of the deflection roller 76 and being converted into a wall flow eventually detaches the leading edge of the sheet 77 involved from the conveyor belt 16 of the non-printing apparatus 13. Figure 19 And as the deflection roller 76 rotates further, the resulting back pressure causes the leading edge of the sheet of paper 77 to gradually separate from the conveyor belt 16 of the non-printing plate printing apparatus 13. Figure 2 This allows the leading edge of the sheet of paper 77, which is still primarily resting on the conveyor belt 16 of the printout apparatus 13, to be lifted onto the profile element 79 and then onto the guide device 42 during its further transport. In the case where the conveyor of the printout apparatus 13 described here, for example, has multiple, for example two, conveyor belts 16 arranged parallel to each other in the conveyor direction T of the sheet of paper 77, it can be configured such that at least one nozzle for ejecting compressed air toward the sheet of paper 77 resting on these conveyor belts 16 is arranged between the conveyor belts 16 arranged side-by-side. It can also be configured such that at least one conveyor belt 16 of the conveyor arranged in the conveyor direction T of the sheet of paper 77, immediately before the interruption 78, has raised longitudinal ribs, wherein grooves are formed between adjacent ribs, and the tip of the profile element 79 of the guide device 42 is arranged in a comb-like manner to extend into the grooves of the conveyor belt 16 with ribs.

[0089] After the leading edge of the sheet 77 is reliably placed on the profile element 79, the guide device 42 is preferably deactivated, for example by the control unit 71, by shutting off the air jet flowing from at least one lifting nozzle 43. Therefore, the air jet flowing from at least one lifting nozzle 43 is preferably activated rhythmically, synchronized with the leading edge of the corresponding sheet 77 reaching the deflection roller 76 of the conveyor belt 16. Thus, it is preferable to maintain the air jet flowing from at least one lifting nozzle 43 of the guide device 42 for only a duration until the leading edge of the corresponding sheet 77 has passed the gap at the interruption point 78 located on the periphery of the deflection roller 76, extending transversely to the conveying direction T of the sheet 77, and the leading edge of the corresponding sheet 77 has been lifted onto the profile element 79 of the guide device 42.

[0090] This results in a machine structure having multiple processing stations for processing individual sheets of paper 77, arranged sequentially along the conveying direction T of the sheets of paper 77. At least one of the processing stations has a first conveying device for conveying the sheets of paper 77 along a straight conveying section. The first conveying device has at least one conveyor belt 16 that deflects on a rotating deflection roller 76 and rotates in a loop or annular pattern. This first conveying device is designed to convey individual sheets of paper 77 sequentially and adjacent to each other, laid flat on its at least one conveyor belt 16. Following the processing station with the first conveying device, a further processing station is arranged to similarly process the sheets of paper 77... A second conveyor or suction belt table 19, which conveys along a straight conveying section, is placed flat on a conveyor belt 18 that rotates one less cycle. At the location where the sheet of paper 77 to be conveyed is transferred from the conveyor belt 16 of the first conveyor to the conveyor belt 18 of the second conveyor that follows along the conveying direction T of the sheet of paper 77, or to the suction belt table 19 in the feeding plane E19 of the sheet of paper 77 to be conveyed, an interruption section 78 is constructed in the mechanical support of the corresponding sheet of paper 77 to be transferred. A deflection roller 76 that deflects at least one conveyor belt 16 of the first conveyor is arranged on the interruption section 78 in the mechanical support of the sheet of paper 77 to be transferred. Here, at the interruption 78, a guide device 42 is arranged for a profile element 79 extending transversely to the conveying direction T of the sheet 77 and having a pointed end. The tip of the profile element 79 points towards the conveyor belt 16 of the first conveying device, opposite to the conveying direction T of the sheet 77. At least one lifting nozzle 43 is arranged in the profile element 79, and the lifting nozzle 43 is designed to open towards the tip of the profile element 79. The tip of the profile element 79 is separated from the conveyor belt 16 of the first conveying device, which is deflected on the rotating deflection roller 76, by a gap. This gap has a width between 1 mm and 5 mm, which is larger than the thickness of the sheet 77. In a preferred embodiment, a plurality of lifting nozzles 43 are arranged in rows extending transversely to the conveying direction T of the sheet 77 in the profile element 79. When the guide device 42 is activated, for example by the control unit 71, an air jet flowing from the opening of the corresponding lifting nozzle 43 is directed, or at least may be directed, towards the conveyor belt 16 of the first conveying device that is deflected on the conveyor belt 16. This air jet is directed towards the conveyor belt 16 such that the core of the air jet intersects the circumference of the deflection roller 76 as a secant. The air jet is also specifically oriented such that the free upper boundary of the air jet facing the leading edge of the sheet of paper 77 conveyed on the conveyor belt 16 of the first conveying device does not intersect with, nor cross, the tangent between the circumference of the deflection roller 76 and the lifting nozzle 43 of the guide device 42. The guide device 42 is activated by the control unit 71.Here, the control unit 71 activates the guide device 42, for example, in a rhythmic manner, wherein the rhythm is synchronized with the arrival of the leading edge of the corresponding sheet 77 at the deflection roller 76 of the conveyor belt 16 deflected by the deflection roller 76 of the first conveying device. Therefore, the guide device 42 is preferably designed to maintain the air jet from the relevant lifting nozzle 43 for only a duration until the leading edge of the corresponding sheet 77 has passed the gap located on the periphery of the deflection roller 76 at the interruption point 78, extending transversely to the conveying direction T of the sheet 77, and the leading edge of the corresponding sheet 77 has been lifted by the air jet from the relevant lifting nozzle 43 to the tip of the profile element 79 of the guide device 42. The deflection roller 76 that deflects at least one conveyor belt 16 of the first conveying device and the guide device 42, together with their profile element 79, are respectively arranged below the feed plane E19 of the sheet of paper 77 to be conveyed and preferably flush with the feed plane E19 upwards, or flush with the top of the conveying plane E19. Since this machine structure is designed as a digital printing press in its preferred embodiment, the processing station with the first conveying device is designed as a printout-free printing unit 13 or a dryer 17 or a cooling section.

[0091] When passing through the dryer 17, which dries the sheets previously printed in the printout apparatus 13 and lies flat on the conveyor belt 18, the sheets are subjected to very high heat input. This causes the dried sheets to deform, i.e., in particular to arch, and thus at least partially lose their flatness. The arching of the dried sheets can be so severe that the sheets lose their adhesion to the conveyor belt 18 of the dryer 17 and are no longer conveyed in the correct position. Thus, the arched sheets of paper arranged at the outlet of dryer 17 can be conveyed by the receiving belt 44 of a conveyor immediately following dryer 17 in the conveying direction T of the sheets. This conveyor, for example, is a suction belt table 19 or a cooling section. Due to insufficient capture, it can no longer be reliably received, which can quickly lead to operational interruptions in machine structures with multiple conveyor devices, especially when such sheets of paper follow each other at conveying speeds of thousands of sheets per hour, for example, about 10,000 sheets per hour. The reason for the insufficient capture of the arched sheets of paper is specifically that the inherent bending resistance in the arched portion of the sheets in question is not overcome by the height-related suction force applied by the suction belt. The problem of unreliable reception of arched sheets of paper by the suction belt in its edge areas, especially on their respective leading edges, may also occur in the feed plane E19 of the suction belt table 19, at the bends 46; 47 that constitute the previously horizontal feed plane. Figure 3 and Figure 20However, in order to avoid damaging the printing pattern previously applied to the upper side of the sheet of paper in question in the non-printing plate printing apparatus 13, it is prohibited to force the sheet of paper flat from above at the location mentioned in the machine structure described herein, for example by means of a mechanical pressing device.

[0092] In order to establish the necessary frictional or force engagement between the sheet of paper, which is arched particularly due to heat input, and the suction belt, and to use the suction belt to deliver the sheet of paper in the correct position, it is proposed to utilize the physical phenomenon of aerodynamic paradox, particularly in relation to the lateral edge region of the leading edge of one of the sheets of paper to be received by the suction belt and / or the sheets of paper to be delivered by the suction belt.

[0093] The solution found is explained in conjunction with the previously introduced suction belt table 19 example. Figure 3 Shown in Figure 20 The image shows an enlarged partial view of the suction belt table 19, as shown in the top view. This partial view specifically relates to the arrangement of the nozzle 49 in the area between two bridging belts 48 arranged parallel to each other along the sheet transport direction T and an edge 94 extending longitudinally relative to the sheet transport direction T, laterally defining the feed plane E19 of the suction belt table 19. The bridging belts 48, like at least one receiving belt 44 arranged preceding them in the sheet transport direction T, are preferably in the form of a rotating looping belt, specifically designed as suction belts. These suction belts are pneumatically and effectively connected to the suction device 72 and can apply suction force to the resting sheets of paper based on their at least segmented perforations. Figure 20 In this context, the conveying direction T of a single sheet of paper is indicated by a directional arrow. The blowing direction of the nozzles 49 arranged in the aforementioned area, i.e., the flow direction of the airflow ejected from these nozzles 49, is, for example, along the conveying direction T of the single sheet of paper. Preferably, and Figure 21 In the illustrated embodiment, the blowing direction of the nozzles 49 arranged in this area is either orthogonal to the feed plane E19 of the suction belt table 19 along the laterally defined edge 94, or inclined at 45° relative to the feed plane E19 of the suction belt table 19 along the sheet transport direction T. It can also be advantageously configured such that the blowing direction of the first group of nozzles 49 is, for example, orthogonal to the feed plane E19 of the suction belt table 19 along the laterally defined edge 94, and the blowing direction of the second group of nozzles 49 is, for example, inclined at 45° relative to the feed plane E19 of the suction belt table 19 along the laterally defined edge 94, along the sheet transport direction T.

[0094] Figure 2 The suction belt stage 19 is shown in Figure 3Partial view of the side view shown. The arrangement is such that, in particular, the sheet of paper conveyed from the dryer 17 to the suction belt table 19 is caught by at least one receiving belt 44 and should continue to be conveyed in the feed plane E19 of the suction belt table 19. Specifically, in the area of ​​at least one receiving belt 44 and in the area of ​​the bridging belt 48 arranged after at least one receiving belt 44 along the sheet conveying direction T of the suction belt table 19, or after the interruption 78 immediately following the mechanical support of the sheet to be conveyed in the sheet conveying direction T, for example, between at least one receiving belt 44 belonging to the suction belt table 19 and the rotating conveyor belt 18 belonging to the dryer 17, a plurality of nozzles 49 are arranged. Figure 20 and Figure 3 These nozzles 49 are specifically designed as venturi nozzles and are connected to a compressed air source 93 via a pneumatically connected inlet pipe 96. In a preferred embodiment, a timing valve 74, controlled by, for example, a control unit 71, is arranged in the inlet pipe 96 connecting at least one nozzle 49 to the compressed air source 93 between the relevant regulating valve 97 and the relevant nozzle 49. This timing valve 74 is preferably controlled by the control unit 71 such that at least one nozzle 49 is supplied with compressed air precisely at the moment when the leading edge of the sheet to be conveyed overlaps with the relevant nozzle 49. The process of applying compressed air to the relevant nozzle 49 is interrupted by the control unit 71, particularly when the leading edge of the relevant sheet to be conveyed overlaps with the next nozzle 49 in the conveying direction T of the sheet. Furthermore, it is configured that when the paper-grabbing device 58 of the suction belt table 19 switches to its paper-grabbing position, the compressed air loading on the nozzles 49 arranged in the envelope of the sheet to be grasped is interrupted by the relevant timing valve 74.

[0095] This results in a suction belt table 19 having at least one receiving belt 44 designed as a suction belt for receiving single sheets of paper lying flat in a feed plane E19 from a conveyor belt 18 of the dryer 17 arranged immediately before the suction belt table 19 along the sheet-feeding direction T. The suction belt table 19 has a plurality of nozzles 4 in its feed plane E19, at least in the region between the receiving belt 44 extending longitudinally relative to the sheet-feeding direction T and the edge 94 laterally defined on the feed plane E19. The arrangement of nozzles 49, wherein the nozzles 49 are designed as venturi nozzles, the flow direction of at least the first group of nozzles 49 arranged in the region is directed along the sheet feed direction T, and / or the flow direction of at least the second group of nozzles 49 arranged in the region is directed orthogonally to the feed plane E19 of the suction belt table 19 along the laterally defined edge 94, and / or the flow direction of at least the third group of nozzles 49 arranged in the region is directed at a 45° angle relative to the feed plane E19 of the suction belt table 19 along the laterally defined edge 94, along the sheet feed direction T. Additionally, on the feed plane E19 of the suction belt table 19, at least one bend 46; 47 is constructed in the sheet-carrying direction T after at least one receiving belt 44, wherein, on each bend 46; 47, the feed plane E19 of the suction belt table 19 undergoes an acute downward tilt with respect to the previous orientation of the feed plane, pointing downward at an acute angle between 5° and 30°, wherein the arrangement of the nozzles 49 between at least one receiving belt 44 and the laterally defined edge 94 of the feed plane E19 of the suction belt table 19 extends beyond the bend 46; 47 in the sheet-carrying direction T. In the mentioned areas or in areas that follow each other in the sheet-carrying direction T, the nozzles 49 are arranged, for example, in multiple rows extending transversely to the sheet-carrying direction T. ​ and 20 ).

[0096] The nozzles 49 are connected to a compressed air source 93 via pneumatically connected inlet pipes 96. Preferably, a regulating valve 97 is arranged in at least one inlet pipe 96 connecting at least one nozzle 49 to the compressed air source 93 for adjusting and / or regulating the pressure of the airflow exiting the respective nozzle 49. In a preferred embodiment, a timing valve 74 is arranged in the inlet pipe 96 connecting at least one nozzle 49 to the compressed air source 93 between the regulating valve 97 and the nozzle 49. The regulating valve 97 and / or the timing valve 74 are controlled by a control unit 71. Specifically, the timing valve 74 is activated by the control unit 71 when the leading edge of the sheet to be conveyed overlaps with the nozzle 49. Specifically, the timing valve 74 is deactivated by the control unit 71 when the leading edge of the sheet to be conveyed overlaps with the next nozzle 49 in the conveying direction T of the sheet. In a particularly preferred embodiment, the suction belt 19 has a paper-catching device 58 having the aforementioned features for catching a single sheet of paper, wherein when the paper-catching device 58 switches to its paper-catching position, the associated timing valve 74 is deactivated by the control unit 71.

[0097] Since the nozzles 49 are designed as venturi nozzles, they generate a suction force acting on the sheet of paper to be conveyed. This suction force is much greater in magnitude than the holding force generated by the suction flow on the suction belt arranged in the feed plane E19 of the suction belt table 19. This holding force is provided to keep the sheet of paper resting flat on the suction belt. Furthermore, the width of the area where the nozzles 49 are arranged, extending transversely to the conveying direction T of the sheet of paper, is designed to be significantly greater than the width of the suction belt extending transversely to the conveying direction T. The height of the sheet of paper results in a significantly more favorable proportional relationship between the width of the area where the nozzles 49 are arranged, beyond the width of the suction belt, and the width of the leading edge of the upper arch of the sheet of paper. Therefore, the area of ​​action formed by the arrangement of the nozzles 49 and acting on the leading edge of the arched sheet of paper is significantly larger than the area of ​​action of the suction belt on the leading edge of the arched sheet of paper. However, the larger the corresponding area of ​​action, the better it can overcome the bending resistance inherent in the arching of the sheet of paper. Since the suction effect of the suction belt is height-dependent and decreases significantly with increasing height, i.e., with increasing distance between the suction belt and the sheet of paper to be conveyed, the nozzles 49, designed as venturi nozzles, can draw the leading edge of the arched sheet of paper forward until the leading edge enters the effective area of ​​the suction flow of the suction belt. When the leading edge of the arched sheet of paper is then sufficiently deep into the effective area of ​​the suction flow of the suction belt due to the action of the nozzle 49, the suction flow may be strong enough to draw the leading edge of the arched sheet of paper over the remaining height onto the suction belt, and establish the frictional or force engagement required for the proper delivery of the sheet of paper. In a preferred embodiment, the control unit 71 is designed such that the control unit first loads compressed air onto the nozzle 49, and only after that, i.e., with a time delay, does the suction force applied to the sheet of paper by at least one receiving belt 44, which is designed as a suction belt, begin to take effect.

[0098] List of reference numerals

[0099] 01 Single Sheet Feeder

[0100] 02 First Stack

[0101] 03 Suction Head

[0102] 04 First Swing Grappling

[0103] 05 First Coating Device

[0104] 06 Conveyor Roller

[0105] 07 Printing Unit Roller

[0106] 08 Inking Roller

[0107] 09 Scraper; Chamber scraper system

[0108] 10-

[0109] 11 First Grip System

[0110] 12 conveyor belts

[0111] 13. Printing apparatus for printmaking

[0112] 14 First Dryer

[0113] 15-

[0114] 16 conveyor belts

[0115] 17 Second Dryer

[0116] 18. Conveying devices; conveyor belts

[0117] 19 suction belt table

[0118] 20-

[0119] 21 Second swing gripper

[0120] 22 Second Coating Device

[0121] 23 conveyor rollers

[0122] 24 printing unit rollers

[0123] 25-

[0124] 26 Inking Rollers

[0125] 27. Scraper; Chamber scraper system

[0126] 28 Second Grappling System

[0127] 29 Paper receiving device

[0128] 30-

[0129] 31 Third Dryer

[0130] 32 Second stack

[0131] 33-turn-turn cylinder

[0132] 34-turn rotary drum

[0133] 35-

[0134] 36 front markings

[0135] 37 blow box

[0136] 38-block

[0137] 39 openings

[0138] 40-

[0139] 41 Suction Chamber

[0140] 42 Guiding Device

[0141] 43 lifting nozzle

[0142] 44 receiving band 45

[0144] 46 First bend

[0145] 47 Second bend

[0146] 48 crossover strap

[0147] 49 mouthpieces

[0148] 50-

[0149] 51 Paper-catching Blower

[0150] 52 Switching Area

[0151] 53 suction holes

[0152] 54 conveyor belt

[0153] 55-

[0154] 56 Brake Band

[0155] 57 suction rollers

[0156] 58 Paper-catching device

[0157] 59 drives

[0158] 60-

[0159] 61 Piston Rod

[0160] 62 crank

[0161] 63 Connector

[0162] 64 tracks

[0163] 65-

[0164] 66 stop surface

[0165] 67 opening

[0166] 68 Bottom chamber

[0167] 69 storage chambers

[0168] 70-

[0169] 71 control unit

[0170] 72 suction device

[0171] 73 Inlet Pipe

[0172] 74-beat valve

[0173] 75-

[0174] 76 deflection rollers

[0175] 77 single sheets of paper

[0176] 78 Interruption Location

[0177] 79 profile components

[0178] 80-

[0179] 81 pneumatic cylinder

[0180] 82 cylinder piston

[0181] 83-end position buffer element

[0182] 84-end position buffer element

[0183] 85-

[0184] 86 First Pneumatic Switching Valve

[0185] 87 Second Pneumatic Switching Valve

[0186] 88 pressure reducer

[0187] 89 pressure reducer

[0188] 90-

[0189] 91 Throttle Valve

[0190] 92 Throttle Valve

[0191] 93 Compressed Air Source

[0192] 94 Edge

[0193] 95-

[0194] 96 inlet pipe

[0195] 97 regulating valve

[0196] a acceleration

[0197] Piston force F

[0198] i transmission ratio

[0199] M centerline

[0200] t time

[0201] T transmission direction

[0202] v speed

[0203] z Adjusting the itinerary

[0204] A51 Distance

[0205] B19 width

[0206] D62 Rotation Point

[0207] E1 endpoint

[0208] E2 endpoint

[0209] E19 Feeding Plane

[0210] G61 hinge point

[0211] G62 hinge point

[0212] G63 Straight Line

[0213] G64 Straight Line

Claims

1. A printing press having a non-printing plate printing device (13), wherein, The printing press has multiple processing stations for processing individual sheets of paper (77), wherein the processing stations are arranged sequentially along the conveying direction (T) of the sheets of paper (77), wherein one of the processing stations has the printing plate printing device (13), and a corresponding processing station with the printing plate printing device (13) or another processing station has a first conveying device for conveying the sheets of paper (77) along a straight conveying section, the first conveying device having at least one circulating conveyor belt (16) deflected on a rotating deflection roller (76), wherein the first conveying device is designed to convey a series of adjacent individual sheets of paper (77) in a flat manner on at least one of its conveyor belts (16), and a second conveying device is arranged after the processing station with the first conveying device, the second conveying device also conveying the sheets of paper (77) in a flat manner along a straight conveying section on at least one circulating conveyor belt (18). In the segmented conveying, in the feeding plane (E19) of the sheet of paper (77) to be conveyed, at the location where the sheet of paper (77) to be conveyed is transferred from the corresponding conveyor belt (16) of the first conveying device to the corresponding conveyor belt (18) of the second conveying device located behind in the conveying direction (T) of the sheet of paper (77), an interruption section (78) is constructed in the mechanical support of the sheet of paper (77) to be transferred, wherein the deflection of at least one conveyor belt (16) of the first conveying device is deflected. A roller (76) is arranged on an interruption (78) in the mechanical support of the sheet of paper (77) to be transferred, wherein a guide device (42) extending transversely to the conveying direction (T) of the sheet of paper (77) is arranged on the interruption (78), the guide device having a pointed end profile element (79), wherein the guide device (42) is arranged in the interruption (78) on two conveyor belts (16;) arranged sequentially to each other along the conveying direction (T) of the sheet of paper (77);Between 18), wherein the tip of the profile element (79) points in the opposite direction (T) of the conveying direction of the sheet paper (77) toward the corresponding conveyor belt (16) of the first conveying device, wherein the tip of the profile element (79) and the corresponding conveyor belt (16) of the first conveying device, which is deflected on the rotating deflection roller (76), are separated by a gap, wherein the gap has a width in the range of 1 mm to 5 mm between the tip of the profile element (79) and the corresponding conveyor belt (16) of the first conveying device, which is deflected on the rotating deflection roller (76), wherein a control unit (71) and at least one lifting nozzle (43) are provided, and the processing station arranged immediately after the processing station having the first conveying device is designed as a suction belt table (19). The device is characterized in that at least one lifting nozzle (43) is arranged in the profile element (79) of the guide device (42), the corresponding lifting nozzle (43) being designed to open toward the tip of the profile element (79), wherein the suction belt table (19) has a paper-grabbing device (58) having an operationally occupied paper-grabbing position for individual sheets of paper (77) following each other adjacently, wherein the paper-grabbing device (58), in its paper-grabbing position, captures and stacks the sheets of paper (77) conveyed to the suction belt table (19) from a first conveyor arranged before the suction belt table (19), the capture and stacking being carried out on the suction belt table (19) before being transferred to a conveyor arranged after the suction belt table (19).

2. The printing press according to claim 1, characterized in that, The guiding device (42) and the deflecting roller (76) that deflects at least one conveyor belt (16) of the first conveying device are respectively arranged below the feed plane (E19) of the sheet of paper (77) to be conveyed and end upward flush with the feed plane (E19).

3. The printing press according to claim 1 or 2, characterized in that, At least one lifting nozzle (43) is activated by the control unit (71) or is at least capable of being activated.

4. The printing press according to claim 1 or 2, characterized in that, In the profile element (79), a plurality of lifting nozzles (43) are arranged in a row extending transversely to the conveying direction (T) of the single sheet of paper (77).

5. The printing press according to claim 3, characterized in that, When the guide device (42) is activated, the air jet flowing out from the opening of the corresponding lifting nozzle (43) is directed to the corresponding conveyor belt (16) of the first conveyor device, which is deflected at the deflection roller (76).

6. The printing press according to claim 5, characterized in that, An air jet pointing to the corresponding conveyor belt (16) of the first conveyor is directed to the corresponding conveyor belt (16) in such a way that the core jet of the air jet intersects the circumference of the deflection roller (76) as a secant.

7. The printing press according to claim 5, characterized in that, The air jet flowing from the opening of the corresponding lifting nozzle (43) is directed toward the corresponding conveyor belt (16) in such a way that the free upper boundary of the air jet facing the leading edge of the sheet of paper (77) being conveyed on the corresponding conveyor belt (16) of the first conveying device neither intersects nor crosses the tangent between the circumference of the deflection roller (76) and the corresponding lifting nozzle (43) of the guide device (42).

8. The printing press according to claim 3, characterized in that, The guiding device (42) is activated by the control unit (71) according to a rhythm, wherein the rhythm is synchronized with the deflection roller (76) of the conveyor belt (16) of the first conveyor device, which is deflected by the deflection roller (76) at the leading edge of the corresponding single sheet of paper (77).

9. The printing press according to claim 1 or 2, characterized in that, The control unit (71) controls at least one lifting nozzle (43) of the guide device (42) in such a way that the guide device (42) maintains the air jet flowing from the corresponding lifting nozzle (43) for only the duration that the leading edge of the corresponding sheet (77) has passed through the gap located on the outer periphery of the deflection roller (76) at the interruption point (78), extending transversely to the conveying direction (T) of the sheet (77), and the leading edge of the corresponding sheet (77) has been lifted by the air jet flowing from the corresponding lifting nozzle (43) to the tip of the profile element (79) of the guide device (42).

10. The printing press according to claim 1 or 2, characterized in that, The control unit (71) that controls the guide device (42) operates the paper-catching device (58) in such a way as to cause the paper-catching device (58) to occupy its paper-catching position in response to a fault that occurs in the processing station located after the suction belt table (19).

11. The printing press according to claim 1 or 2, characterized in that, The control unit (71) that controls the guiding device (42) is designed such that, in the event of a failure in the processing station located after the suction belt table (19), the conveying speed of the sheet (77) is reduced at least in the conveying device located before the paper catcher (58) along the conveying direction (T) of the sheet (77).

12. The printing press according to claim 1 or 2, characterized in that, The suction belt table (19) has at least one circulating receiving belt (44) designed as a suction belt for receiving single sheets (77) individually conveyed in a flat manner in the feed plane (E19) from a conveyor belt (18) arranged in the conveying direction (T) of the single sheet (77) preceding the suction belt table (19), wherein the suction belt table (19) in its feed plane (E19) at least in at least one longitudinal direction (T) relative to the single sheet (77) The structure has a plurality of nozzles (49) in the region between the extended receiving belt (44) and the feed plane (E19) of the suction belt table (19) defined along the laterally defined edge (94), wherein the nozzles (49) arranged in at least one longitudinally extending receiving belt (44) relative to the conveying direction (T) of the single sheet (77) and the feed plane (E19) of the suction belt table (19) defined along the laterally defined edge (94) are designed as Venturi nozzles.

13. The printing press according to claim 12, characterized in that, The arrangement of the Venturi nozzles in the conveying direction (T) of the sheet (77) begins at a distance of less than 200 mm behind the at least one lifting nozzle (43).

14. The printing press according to claim 12, characterized in that, The deflection roller (76) arranged at the interruption part (78) has at least one nozzle-shaped opening on its shell surface, from which compressed air jets are ejected respectively, wherein one of the compressed air jets is directed at at least one lifting nozzle (43).

15. The printing press according to claim 1 or 2, characterized in that, The first conveying device has a plurality of conveyor belts (16) arranged parallel to each other in the conveying direction (T) of the single sheet (77), wherein at least one nozzle is arranged between adjacent conveyor belts (16) to spray compressed air toward the single sheet (77) placed on these conveyor belts (16).

16. The printing press according to claim 1 or 2, characterized in that, At least one conveyor belt (16) of the conveying device arranged immediately before the interruption (78) in the conveying direction (T) of the single sheet (77) has raised longitudinal ribs, wherein grooves are formed between adjacent longitudinal ribs, wherein the tips of the profile elements (79) of the guide device (42) are arranged in a comb-like manner to extend into the grooves of the conveyor belt (16) with longitudinal ribs.

Images