Machine assembly for conveying sheet-like substrates, comprising a first belt conveyor and a second belt conveyor, and a printing machine comprising said machine assembly
Patent Information
- Application Number
- EP2023793737
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-02-08
- Filing Date
- 2023-10-18
- Publication Date
- 2024-12-18
AI Technical Summary
Existing machine arrangements for conveying sheet-shaped substrates face issues with trouble-free transfer at high speeds, particularly with substrates of small formats, as the front edge tends to get caught at transfer points, leading to operational disruptions and economic losses.
A machine arrangement featuring a first belt conveyor with a deflection roller and a second belt conveyor, utilizing a guide device with a tapering profile element and lifting nozzles to ensure smooth transfer, combined with stronger negative pressure in the last suction chamber to hold substrates firmly until they reach the lifting area, preventing snagging.
Enables reliable and trouble-free transfer of substrates at high speeds (5,000-10,000 per hour) and small formats (less than 300 mm edge length) from the first belt conveyor to the second, preventing operational disruptions and ensuring continuous production.
Smart Images
Figure EP2023079003_15082024_PF_FP
Abstract
Description
[0001] Description
[0002] Machine arrangement for conveying sheet-shaped substrates, comprising a first belt conveyor and a second belt conveyor, and a printing machine with this machine arrangement
[0003] The invention relates to a machine arrangement for conveying sheet-shaped substrates according to claim 1 and to a printing press with this machine arrangement according to claim 11.
[0004] EP 3 025 867 A1 discloses a sheet transport arrangement for transporting a sheet along a process unit, the process unit being configured to apply a process to the sheet, the sheet transport arrangement comprising:
[0005] - a conveyor unit with a conveyor belt and a deflection element, wherein the conveyor belt is designed to transport the sheet in a transport direction along the process unit to the deflection element, wherein the sheet is deposited with a support side on the conveyor belt and with a process side towards the process unit, wherein the deflection element is arranged in contact with the conveyor belt in order to deflect the conveyor belt downstream in the transport direction relative to the process unit;
[0006] - a separation unit for separating the sheet from the conveyor belt, the separation unit being connected to an air supply source and comprising a retention blower device arranged in a retention area for directing a retention air flow onto the process side of the sheet in order to urge the sheet near the deflection element towards the conveyor belt, and a lifting blower device arranged in a lifting area for directing a lifting air flow onto the support side of the sheet in order to lift the sheet from the conveyor belt, the lifting area being arranged to extend only over a central portion of a width of the sheet, the width being a dimension of the sheet in a lateral direction perpendicular to the transport direction.
[0007] JP 2013-040007 A discloses a conveyor capable of smoothly transferring workpieces between conveyor units. The conveyor comprises a plurality of conveyor units, a belt is tensioned to be placed between at least two rollers positioned at a distance from each other, and the workpieces lying on the surface of the belt are sucked in and conveyed by rotation of the belt caused by a drive of the rollers. The conveyor includes a scraper provided on the downstream side of the conveyor unit for scraping the workpieces from the surface of the belt, and an air jet part provided in front of the downstream roller of the conveyor unit for blowing air from the back of the belt onto the lower surfaces of the workpieces.
[0008] JP 2006036471 A relates to a solution for preventing front and rear end parts of a substrate, which is transported in a bent state from a device on the supply side to a device on the take-up side, from coming into contact with a counter device.
[0009] JP S55 - 135024 A relates to a conveyor in which air is injected against the bridge of two conveyor belts or in which a floating system is provided for sucking the material in order to ensure safe conveying without the material getting stuck between the conveyor belts.
[0010] DE 102019208156 A1 discloses a printing press comprising a first conveyor belt and a downstream, second conveyor belt for transporting sheets, with a guide element for the sheets arranged therebetween. A blowing device is provided for lifting a leading edge of the respective sheet in the region of the transition from the first conveyor belt to the guide element. The blowing device is preferably arranged upstream of the guide element and within a circulating path of the first conveyor belt, as seen in the direction of sheet transport. The first conveyor belt has, for example, a perforation, and the blowing device blows through the perforation onto the respective sheet.
[0011] DE 102021 118468 B3 discloses a machine arrangement with a plurality of processing stations, each processing sheets, wherein these processing stations are arranged one behind the other in the transport direction of the sheets, wherein at least one of these processing stations has a first transport device transporting the sheets along a linear transport path with at least one endlessly circulating conveyor belt deflected at a deflection roller, wherein this first transport device is designed to transport successive individual sheets in a sequence, each lying on its at least one conveyor belt, wherein this processing station having the first transport device is followed by a second transport device transporting the sheets likewise lying on at least one endlessly circulating conveyor belt along a linear transport path,wherein at the point of transfer of the sheets to be transported from the conveyor belt of the first transport device to the conveyor belt of the second transport device following in the transport direction of the sheets, in a conveying plane of these sheets to be transported, a discontinuity point is formed in the mechanical support of these respective sheets to be transferred, wherein the deflection roller deflecting the at least one conveyor belt of the first transport device is arranged at the discontinuity point in the mechanical support of the sheets to be transferred, wherein at this discontinuity point a guide device extending transversely to the transport direction of the sheets is arranged with a pointed profile element, wherein the tip of this profile element is directed against the transport direction of the sheets towards the conveyor belt of the first transport device, wherein at least one lifter nozzle is arranged in the profile element,wherein the respective siphoning nozzle is designed to open towards the tip of this profile element.,
[0012] The invention is based on the object of creating a machine arrangement for conveying sheet-shaped substrates and a printing press with this machine arrangement, wherein a trouble-free transfer of the substrates from a first belt conveyor to a downstream second belt conveyor is ensured both at a high transport speed of several thousand substrates per hour, e.g. in a range between 5,000 and 10,000 substrates per hour, and with substrates of small format, e.g. in particular with a short edge length of e.g. less than 300 mm in the transport direction of these substrates to be transported.
[0013] The object is achieved according to the invention by the features of claims 1 and 11. The respective dependent claims relate to advantageous embodiments and / or further developments of the solution found.
[0014] The advantages achievable with the invention are, in particular, that in a machine arrangement for conveying sheet-shaped substrates, these can be transferred reliably and thus smoothly from a first belt conveyor to a downstream second belt conveyor, both at a high transport speed of several thousand substrates per hour, e.g., in a range between 5,000 and 10,000 substrates per hour, and in a small format, i.e., in particular with a short edge length of, e.g., less than 300 mm in the transport direction of the substrates to be transported. Further advantages can be derived from the following explanation of the invention.
[0015] An embodiment of the invention is illustrated in the drawings and is described in more detail below.
[0016] Shown are: Fig. 1 a first section of a machine arrangement with a first belt conveyor and with a second belt conveyor, each for conveying sheet-shaped substrates;
[0017] Fig. 2 shows a section of a printing machine with the machine arrangement according to Fig. 1;
[0018] Fig. 3 shows a second section of the machine arrangement according to Fig. 1 to illustrate its mode of operation.
[0019] Fig. 1 shows a first section of a simplified machine arrangement for conveying sheet-shaped substrates 01. This machine arrangement has a first belt conveyor 02 and a second belt conveyor 03, wherein these two adjacently arranged belt conveyors 02; 03 each have an endlessly circulating conveyor belt 04; 06 and are arranged one after the other in the transport direction T of the substrates 01 conveyed lying on the respective conveyor belt 04; 06.
[0020] Such a machine arrangement is, as shown by way of example in Fig. 2, for example, a component of a printing press that prints the sheet-shaped substrates 01 in an industrial printing process using a non-impact printing device 07, wherein the non-impact printing device 07 is designed to print the sheet-shaped substrates 01, for example, using an inkjet printing process. For example, the non-impact printing device 07 has at least one, preferably several inkjet print heads 23. The inkjet print heads 23, which are controlled by a control unit 33, apply, in particular, a water-based ink to the respective substrate 01 in accordance with a print image to be created. Such a printing press used in an industrial printing process usually has several machine units one after the other in the transport direction T of the substrates 01.At least one of these machine units is designed as a printing unit 09, at least one further machine unit is designed as a dryer 11 or as a cooling device 12, or first a dryer 11 and then a cooling device 12 are provided one after the other. In particular, these aforementioned machine units, each of which is preferably arranged in its own machine frame and is thus each designed, for example, as an independent module, are connected to the machine arrangement according to the invention for conveying sheet-shaped substrates 01, since they in particular use such a machine arrangement. Furthermore, it can be provided in the aforementioned printing press that a first system 08 feeds sheet-shaped substrates 01 to be printed individually and one after the other to the printing unit 09, wherein the printing unit 09 has the aforementioned non-impact printing device 07.In a preferred embodiment of the printing press, the printed substrates 01 are fed directly after the printing unit 09 to the dryer 11, which is designed, for example, as a continuous dryer, in particular as a hot-air dryer, and can, if required, have an infrared radiation device in addition to the hot-air dryer. Since the substrates 01 heat up at least partially to, for example, over 80°C as they pass through the dryer 11, a cooling section with a cooling device 12 can advantageously be provided directly after the dryer 11, which cools the printed and dried substrates 01 back to a temperature of, for example, less than 30°C. The substrates 01 can then be transferred to a second system 13 or to a delivery system in order to transport these substrates 01, for example, to a coating system or to a mechanical further processing system.The three aforementioned machine units, printing unit 09, dryer 11, and cooling device 12, preferably transport the substrates 01 in a translational manner, in particular by means of belt conveyors 02; 03, so that the machine arrangement according to the invention is designed for conveying sheet-shaped substrates 01, e.g., at a transfer point between the printing unit 09 and the dryer 11 and / or at a transfer point between the dryer 11 and the cooling device 12 and / or at a transfer point between the cooling device 12 and the second system 13 or the delivery device.
[0021] It has now been shown in practice that the transfer points mentioned above, as examples, tend to be prone to failure with regard to the transport of the substrates 01, particularly at a high transport speed of several thousand substrates 01 per hour, because a leading edge 14 of the substrates 01 in the transport direction T can sometimes all too easily get caught on or in the transfer point in question, resulting in an operational disruption for the entire machine arrangement and an associated interruption in production. Since an operational disruption caused in this way always requires some time to rectify, this problem can lead to considerable economic losses, particularly if the substrates 01 are to be transported in an industrial process with a transport speed of several thousand substrates 01 per hour, e.g., in the range between 5,000 and 10,000.000 substrates 01 per hour are to be transported because the entire production process is set to this transport speed and thus this substrate throughput.
[0022] The substrates 01 to be conveyed by means of the machine arrangement according to the invention are preferably rectangular and consist, for example, of paper or cardboard. Paper, cardboard, and paperboard differ in their respective grammage, i.e., the weight in grams per square meter of these substrates. Paper has a grammage between 30 g / m 2 and 150 g / m 2 , cardboard with a basis weight between 150 g / m 2 and 600 g / m 2 and cardboard with a basis weight of more than 600 g / m 2. However, the substrates 01 to be conveyed can also each be made of a plastic and / or as a thin metallic sheet and / or as a composite consisting, for example, of several layers, wherein these layers are made of different materials. As can be seen from Figs. 1 and 2, the load section of the conveyor belt 04 of the first belt conveyor 02, which is arranged immediately upstream of the second belt conveyor 03, and the load section of the conveyor belt 06 of the second belt conveyor 03 are arranged in the same transport plane extending rectilinearly in the transport direction T of the substrates 01. The load section is that part of the respective conveyor belt 04; 06 on which the substrate 01 to be transported rests during its transport. The conveyor belt 04 of the first belt conveyor 02 is deflected at its rear end in the transport direction T of the substrates 01 by at least 90° to the transport plane on a preferably rotating deflection roller 16.The conveyor belt 06 of the second belt conveyor 03 is also deflected at its front end in the transport direction T of the substrates 01 by at least 90° to the transport plane in the same direction as the conveyor belt 04 of the first belt conveyor 02 on a deflection roller 17, which is arranged at a first distance A from the deflection roller 16 of the first belt conveyor 02 and is also preferably rotating. The respective direction of rotation of the respective deflection roller 16; 17 and thus the direction of rotation of the respective conveyor belt 04; 06 is indicated in Fig. 1 by a direction of rotation arrow. In particular, the deflection roller 16 of the first belt conveyor 02 is preferably designed as a belt conveyor roller that drives the conveyor belt 04 of the first belt conveyor 02.
[0023] The transport plane has a discontinuity in the mechanical support of the substrates 01 to be transported in a region between the deflection roller 16 of the first belt conveyor 02 and the deflection roller 17 of the second belt conveyor 03. In order to allow the substrates 01 to be transported to slide over this discontinuity, a guide device 18 with at least one lifting nozzle 19 is arranged in this region of the discontinuity between the deflection roller 16 of the first belt conveyor 02 and the deflection roller 17 of the second belt conveyor 03. The guide device 18 extends both in the transport direction T of the substrates 01 and transversely thereto and has a tapered profile element 21 extending transversely to the transport direction T of the substrates 01, preferably in the form of a doctor blade, wherein the at least one lifting nozzle 19 of the guide device 18 is arranged opening into the tip 22 of the profile element 21.Preferably, a plurality of lifting nozzles 19 arranged in at least one row are arranged in the tip 22 of the profile element 21 of the guide device 18. The tip 22 of this profile element 21 is directed at least approximately tangentially to the conveyor belt 04 of the first belt conveyor 02, counter to the transport direction T of the substrates 01, and is spaced apart by a first gap from the conveyor belt 04 deflected at the deflection roller 16 of the first belt conveyor 02. This first gap has a gap width S in the range, for example, between 1 mm and 5 mm, wherein this gap width S is greater than the thickness d of the substrates 01.
[0024] At least the conveyor belt 04 of the first belt conveyor 02 is designed as a flat suction belt with a perforation in its transport surface, wherein the substrate 01 to be transported is held in a force-fitting manner with its support surface resting on the perforated transport surface of the suction belt. The force-fitting is achieved by a negative pressure exerting a suction force, wherein this negative pressure holding the substrate 01 to be transported on the suction belt is a negative pressure developed with reference to the barometric air pressure surrounding the machine arrangement, wherein this negative pressure is generated by means of a suction device and is, for example, also adjusted in terms of amount. The suction device exerting the suction force on the conveyor belt 04 of the first belt conveyor 02, which is designed as a suction belt, has at least one suction chamber 24 below the load side of this conveyor belt 04.The load strand of the conveyor belt 04 designed as a suction belt is supported, at least in the region of the relevant suction chamber 24, preferably by one or more support rollers 34 each extending transversely to the transport direction T of the substrates 01. However, the load strand of the conveyor belt 06 of the second belt conveyor 03 can also be supported, at least in sections, by one or more support rollers 34 each extending transversely to the.
[0025] Support rollers 36 extending in the transport direction T of the substrates 01 are supported. This is advantageous if the conveyor belt 06 of the second belt conveyor 03 is also designed as a suction belt and at least one suction chamber is arranged below the load strand of this conveyor belt 06. Support rollers 36 are then arranged in particular in the region of this suction chamber.
[0026] A wall 27 of a suction chamber 26 of the suction device belonging to the first belt conveyor 02, which is the last in the transport direction T of the substrates 01, is arranged at a second distance B from the deflection roller 16 of this first belt conveyor 02, in the transport direction T of the substrates 01, immediately in front of this deflection roller 16. This second distance B is, for example, 1.5 mm to 3 mm. The wall 27 of the suction chamber 26 of the suction device belonging to the first belt conveyor 02, which is the last in the transport direction T of the substrates 01, is arranged, for example, obliquely to the transport plane extending rectilinearly in the transport direction T of the substrates 01, or it forms, over a curved section, for example, an equidistant from the outer surface 28 of the deflection roller 16 of the first belt conveyor 02. In the embodiment in which the wall 27 of the suction chamber 26, which is the last in the transport direction T of the substrates 01, is arranged obliquely, i.e.is arranged at an acute angle to the transport plane extending rectilinearly in the transport direction T of the substrates 01, this angle is open opposite to the transport direction T of the substrates 01.
[0027] In a preferred embodiment, the last suction chamber 26 in the transport direction T of the substrates 01 is subjected to a higher vacuum than the at least one suction chamber 24 arranged upstream of this last suction chamber 26. The vacuum in the last suction chamber 26 in the transport direction T of the substrates 01 is set to, for example, 6,000 Pa, whereas in the at least one other upstream suction chamber 24, the vacuum is set to, for example, 600 Pa. The vacuum in the last suction chamber 26 in the transport direction T of the substrates 01 can thus be set to, for example, ten times higher than in the at least one other upstream suction chamber 24.In a preferred embodiment, the last suction chamber 26 in the transport direction T of the substrates 01 extends over a length L26 of no more than 100 mm, whereas the at least one other upstream suction chamber 24 in the transport direction T of the substrates 01 can have a length of more than 1,000 mm. The wall 27 of the last suction chamber 26 in the transport direction T of the substrates 01 and the outer surface 28 of this deflection roller 16 of the first belt conveyor 02 are arranged to form a channel 29 through which air can flow.
[0028] Furthermore, at least one counter nozzle 31 is provided, wherein the respective counter nozzle 31 is arranged to blow air into the channel 29 formed by the wall 27 of the last suction chamber 26 in the transport direction T of the substrates 01 and the outer surface 28 of the deflection roller 16 of the first belt conveyor 02 in the direction of the suction belt. It is provided that the air blown into the channel 29 exits in the transport direction T of the substrates 01 upstream of a tangent point 32 formed by the suction belt on the deflection roller 16 of the first belt conveyor 02, through the suction belt, and presses against a substrate 01 resting on the suction belt. This air outlet is preferably located directly upstream of this tangent point 32 or at least at a third distance C from this tangent point 32, wherein this third distance C is less than the radius R of the respective deflection roller 16 of the first belt conveyor 02.An air flow emerging from the at least one lifter nozzle 19 of the guide device 18 and the air flow generated by the at least one counter nozzle 31 in the channel 29 and passing through the suction belt are directed so as to preferably meet head-on above the tangent point 32 of the deflection roller 16 of the first belt conveyor 02. These two air flows form a combined air flow in an effective area W extending above the tangent point 32 of the deflection roller 16 of the first belt conveyor 02 along the outer surface 28 of this deflection roller 16, which is shorter than the diameter D of the deflection roller 16 of the first belt conveyor 02.This combined air flow exerts pressure between the suction belt and a substrate 01 to be transported thereon, acting against at least part of the support surface of this substrate 01, whereby this combined air flow lifts, in particular, the front edge 14 of the substrate 01 to be transported from the transport surface of the conveyor belt 04, designed as a suction belt, of the first belt conveyor 02. During its further transport, the entire substrate 01 is ultimately lifted onto the guide device 18 and thus over the discontinuity in the mechanical support, and is reliably fed to the conveyor belt 06 of the second belt conveyor 03 in the transport plane.
[0029] Fig. 3 now shows a second section of the machine arrangement according to Fig. 1 to clarify its mode of operation. A substrate 01, which is transported lying flat in the transport direction T by the conveyor belt 04 of the first belt conveyor 02, which is designed as a suction belt, is held on its support surface in a force-fitting manner on the suction belt, initially by a negative pressure generated by the at least one suction chamber 24 and, as the transport progresses, by a negative pressure generated by the last suction chamber 26. The negative pressure generated by the last suction chamber 26 is indicated in Fig. 3 by two directional arrows and is set, for example, ten times stronger than the negative pressure generated by the at least one suction chamber 24 arranged upstream of the substrates 01 in the transport direction T.After the leading edge 14 of the respective substrate 01 has passed the effective range of the last suction chamber 26, determined by the length L26, during further transport progress in the transport direction T, this leading edge 14 of the respective substrate 01 reaches that effective range W in which the air flow generated by the at least one lifter nozzle 19 of the guide device 18 and the air flow generated by the at least one counter nozzle 31 in the channel 29 and passing through the suction belt form a combined air flow. These two air flows are directed in opposite directions - as indicated in Fig. 3 by directional arrows - and meet above the tangent point 32 of the deflection roller 16 of the first belt conveyor 02.In the absence of any other drainage option, these two air streams combine to form a combined air stream directed against the support surface of the transported substrate 01, whereby this combined air stream exerts pressure against the support surface of the transported substrate 01. This pressure is initially exerted - as shown in Fig. 3 - against the front edge 14 of the respective substrate 01. As the transport progresses, the entire support surface of the transported substrate 01 is lifted off the suction belt of the first belt conveyor 02. The spatial area in which this lifting occurs is referred to as the lifting area H, whereby this lifting area H is located within the effective area W of the combined air stream.
[0030] The proposed solution ensures that a substrate 01 to be transported is reliably held with its support surface on the suction belt of the first belt conveyor 02, while also ensuring that the substrate 01 in question is smoothly guided over the discontinuity point formed between the two belt conveyors 02; 03. This is because the vacuum of the last suction chamber 26, which is set higher than the vacuum of the at least one upstream suction chamber 24, fixes the substrate 01 to be transported until it reaches the lifting area H.Since the last suction chamber 26 of the first belt conveyor 02 in the transport direction T, with the negative pressure it generates, which holds the substrate 01 to be transported in a force-locking manner, reaches a third distance C which is less than the radius R of the relevant deflection roller 16 of the first belt conveyor 02, and thus very close to the tangent point 32 of the deflection roller 16 of the first belt conveyor 02, and this last suction chamber 26 also only extends over a length L26 which is short compared to the upstream suction chamber 24, preferably not more than 100 mm, the substrate 01 to be transported remains reliably fixed up to a very short distance from the tangent point 32 of the deflection roller 16 of the first belt conveyor 02, which is particularly advantageous for substrates 01 which have a comparatively short length in their transport direction T.The combined air flow formed by the combination of the air flow generated by the at least one lifting nozzle 19 of the guide device 18 and the air flow generated by the at least one counter nozzle 31 in the channel 29 and passing through the suction belt is so powerful in the lifting area H that a bending moment is exerted first on the front edge 14 of the transported substrate 01, which is fixed to the suction belt by the vacuum of the last suction chamber 26, and then, as the transport progresses, on the entire support surface of the substrate 01 to be transported, lifting the respective substrate 01 from the suction belt. This reliably prevents the front edge 14 of the respective transported substrate 01 from bending at or in the discontinuity point formed between the two belt conveyors 02; 03, i.e.hooked at the relevant transfer point, so that an operational disruption of the entire machine arrangement caused by hooking, with an associated interruption in production, can be reliably avoided.
[0031] The solution found thus has the advantage that it can transfer the substrate 01 to be transported from a first belt conveyor 02 to a downstream second belt conveyor 03 in an operationally reliable and thus trouble-free manner, both at a high transport speed of several thousand substrates 01 per hour, e.g. in the range between 5,000 and 10,000 substrates 01 per hour, and also with a very short substrate format of e.g. less than 300 mm edge length in the transport direction T.
[0032] List of reference symbols
[0033] 01 Substrat
[0034] 02 first belt conveyor
[0035] 03 second belt conveyor
[0036] 04 Conveyor belt
[0037] 05 -
[0038] 06 Conveyor belt
[0039] 07 Non-impact printing device
[0040] 08 first system
[0041] 09 Printing unit
[0042] 10 -
[0043] 11 dryers
[0044] 12 Cooling device
[0045] 13 second facility
[0046] 14 front edge
[0047] 15 -
[0048] 16 Deflection roller
[0049] 17 Deflection roller
[0050] 18 Guidance device
[0051] 19 Lifting nozzle
[0052] 20 -
[0053] 21 profile element
[0054] 22 lace
[0055] 23 Inkjet printhead
[0056] 24 suction chamber
[0057] 25 -
[0058] 26 last suction chamber
[0059] 27 Wall 28 Shell surface
[0060] 29 Channel
[0061] 30 -
[0062] 31 Counter nozzle
[0063] 32 Tangent point
[0064] 33 Control unit
[0065] 34 support roller
[0066] 35 -
[0067] 36 support roller
[0068] A distance
[0069] B Distance
[0070] C Distance
[0071] D Diameter d Thickness
[0072] H Lifting range
[0073] L26 Length
[0074] R Radius
[0075] S gap width
[0076] T Transport direction
[0077] W Effective range
Claims
Claims 1. A machine arrangement for conveying sheet-shaped substrates (01), comprising a first belt conveyor (02) and a second belt conveyor (03), wherein these belt conveyors (02; 03) each have an endlessly circulating conveyor belt (04; 06) and are arranged one after the other in the transport direction (T) of the substrates (01) conveyed on the respective conveyor belt (04; 06), wherein the conveyor belt (04) of the first belt conveyor (02) and the conveyor belt (06) of the second belt conveyor (03) are arranged in a same transport plane extending rectilinearly in the transport direction (T) of the substrates (01),wherein the conveyor belt (04) of the first belt conveyor (02) is deflected at its rear end in the transport direction (T) of the substrates (01) by at least 90° to the transport plane at a deflection roller (16), and wherein the conveyor belt (06) of the second belt conveyor (03) is deflected at its front end in the transport direction (T) of the substrates (01) by at least 90° to the transport plane at a deflection roller (17) arranged at a first distance (A) from the deflection roller (16) of the first belt conveyor (02) in the same direction as the conveyor belt (04) of the first belt conveyor (02), wherein the transport plane has a discontinuity in the mechanical support of the substrates (01) to be transported in a region between the deflection roller (16) of the first belt conveyor (02) and the deflection roller (17) of the second belt conveyor (03),wherein in this region of the discontinuity point between the deflection roller (16) of the first belt conveyor (02) and the deflection roller (17) of the second belt conveyor (03) a guide device (18) extending transversely to the transport direction (T) of the substrates (01) and guiding the substrates (01) to be transported is arranged, with at least one lifting nozzle (19), wherein the guide device (18) has a tapered profile element (21) extending transversely to the transport direction (T) of the substrates (01), wherein the at least one lifting nozzle (19) of the guide device (18) is in the tip (22) of the profile element, (21) is arranged, wherein the tip (22) of this profile element (21) is directed counter to the transport direction (T) of the substrates (01) towards the transport belt (04) of the first belt conveyor (02) and is arranged at a distance by a first gap from the transport belt (04) deflected at the deflection roller (16) of the first belt conveyor (02), wherein at least the transport belt (04) of the first belt conveyor (02) is designed as a suction belt that non-positively holds the respective substrate (01) resting on its support surface, wherein the suction force is realized by a negative pressure adjusted with respect to the ambient barometric air pressure by means of a suction device, wherein the suction device that realizes the suction force on the suction belt of the first belt conveyor (02) has at least one suction chamber (24),wherein a wall (27) of a last suction chamber (26) of the suction device in the transport direction (T) of the substrates (01) is arranged at a second distance (B) from the deflection roller (16) of the first belt conveyor (02) in the transport direction (T) of the substrates (01) immediately in front of this deflection roller (16), wherein the wall (27) of the last suction chamber (26) in the transport direction (T) of the substrates (01) and the outer surface (28) of this deflection roller (16) of the first belt conveyor (02) are arranged to form a channel (29) through which air can flow, wherein at least one counter nozzle (31) is provided, wherein the respective counter nozzle (31) directs air into the channel (29) formed by the wall (27) of the last suction chamber (26) in the transport direction (T) of the substrates (01) and the outer surface (28) of the deflection roller (16) of the first belt conveyor (02) in the direction of the suction belt is arranged blowing, whereby it is providedthat the air blown into the channel (29) emerges in the transport direction (T) of the substrates (01) in front of a tangent point (32) formed by the suction belt on the deflection roller (16) of the first belt conveyor (02) through the suction belt and presses against a substrate (01) lying on the suction belt, wherein an air flow emerging from the at least one lifting nozzle (19) of the guide device (18) and the air flow generated by the at least one counter nozzle (31) in the channel (29) and through the suction belt, passing air flow above the tangent point (32) of the deflection roller (16) of the first belt conveyor (02) are directed to meet one another, wherein these two air flows form a combined air flow in an effective area (W) which is shorter than the diameter (D) of the deflection roller (16) of the first belt conveyor (02), wherein the combined air flow is directed such that it exerts a pressure acting against at least part of the support surface of this substrate (01) between the suction belt and a substrate (01) to be transported thereon.
2. Machine arrangement according to claim 1, characterized in that the deflection roller (16) of the first belt conveyor (02) is designed as a belt conveyor roller driving the transport belt (04) of the first belt conveyor (02).
3. Machine arrangement according to claim 1 or 2, characterized in that the load strand of the conveyor belt (04) of the first belt conveyor (02), designed as a suction belt, is supported at least in the region of the suction chamber (24) implementing the suction force on this suction belt by one or more support rollers (34) each extending transversely to the transport direction (T) of the substrates (01).
4. Machine arrangement according to claim 1 or 2 or 3, characterized in that the first gap between the tip (22) of the profile element (21) of the guide device (18) and the conveyor belt (04) deflected at the deflection roller (16) of the first belt conveyor (02) has a gap width (S) in the range between 1 mm and 5 mm.
5. Machine arrangement according to claim 1 or 2 or 3 or 4, characterized in that the tip (22) of the profile element (21) of the guide device (18) is directed tangentially to the conveyor belt (04) of the first belt conveyor (02).
6. Machine arrangement according to claim 1 or 2 or 3 or 4 or 5, characterized in that the last suction chamber (26) in the transport direction (T) of the substrates (01) is subjected to a higher amount of negative pressure than the at least one suction chamber (24) arranged upstream of this last suction chamber (26).
7. Machine arrangement according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that the last suction chamber (26) in the transport direction (T) of the substrates (01) is shorter in the transport direction (T) of the substrates (01) than the at least one suction chamber (24) arranged upstream of this last suction chamber (26).
8. Machine arrangement according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that the last suction chamber (26) in the transport direction (T) of the substrates (01) has a length (L26) of not more than 100 mm.
9. Machine arrangement according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized in that the wall (27) of the last suction chamber (26) in the transport direction (T) of the substrates (01) of the suction device belonging to the first belt conveyor (02) is arranged obliquely to the transport plane extending rectilinearly in the transport direction (T) of the substrates (01) and / or forms an equidistant from the outer surface (28) of the deflection roller (16) of the first belt conveyor (02) over an arc section.
10. Machine arrangement according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, characterized in that a spatial area in which the combined air flow between the suction belt of the first belt conveyor (02) and a substrate (01) to be transported thereon has a Part of the support surface of this substrate (01) exerts pressure, forming a lifting area (H), wherein this lifting area (H) is arranged within the effective area (W) of the combined air flow.
11. Printing machine, comprising a machine arrangement according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10, wherein a plurality of machine units are arranged one after the other in the transport direction (T) of the substrates (01), wherein at least one of these machine units is designed as a printing unit (09) and at least one further machine unit is designed as a dryer (11) or as a cooling device (12), wherein these machine units designed as a printing unit (09) or as a dryer (11) or as a cooling device (12) are each arranged in a separate machine frame, wherein each of these machine units transports the substrates (01) by means of one of the belt conveyors (02;03) is designed to transport, wherein at a transfer point between the printing unit (09) and the dryer (11) and / or at a transfer point between the dryer (11) and the cooling device (12) and / or at a transfer point between the cooling device (12) and a system (13) arranged downstream of this cooling device (12), the point of discontinuity in the mechanical support of the substrates (01) to be transported is formed between the respective first belt conveyor (02) and the respective second belt conveyor (03); 12. Printing machine according to claim 11, characterized in that the printing unit (09) has a non-impact printing device (07) printing the substrates (01) in an inkjet printing process, wherein the non-impact printing device (07) in question has at least one inkjet print head (23) controlled by a control unit (33).
13. Printing machine according to claim 11 or 12, characterized in that the Dryer (11) is designed as a continuous dryer and wherein the dryer (11) is designed as a hot air dryer.