Sheet influencing arrangement and method for influencing transported sheets

Abstract

A sheet influencing arrangement for influencing sheets (11) transported in a sheet transport direction (10) comprises: a sheet transport device (14) for transporting received sheets (11) in a sheet transport direction (10) at a sheet transport speed; a sheet deceleration device (18), assigned to the sheet transport device (14), for decelerating the sheets (11) on the sheet transport device (14) from a sheet starting speed to the sheet transport speed, forming a shingled stream of sheets; a sheet deceleration distance determination device for determining deceleration distances of the sheets (11) from the sheet starting speed to the sheet transport speed of the sheet transport device (14); and a processing unit (26) that maintains an at least intermittent signal connection with the sheet deceleration distance determination device in order to receive sheet deceleration distance signals concerning the deceleration distances of the sheets (11).

Description

[0001] ARGORY INFLUENCE ARRANGEMENT AND METHOD FOR INFLUENCED TRANSPORTED

[0002] BOWS

[0003] The invention relates to a sheet-controlling device for influencing sheets transported in a sheet-carrying direction, in particular corrugated board sheets. It further relates to a system, in particular a corrugated board system, with at least one such sheet-controlling device. The invention also relates to a method for influencing sheets transported in a sheet-carrying direction, in particular corrugated board sheets.

[0004] Prior use has revealed known arc-influencing devices that slow down generated arcs, resulting in a shingled arrangement of the arcs, i.e., an arc-shingled stream. This shingled arrangement is necessary for automatic stacking. The quality of the arc braking process is crucial for stacking accuracy and separation accuracy between successive orders. However, the braking process, or rather the quality of the shingled arrangement, is often unsatisfactory.

[0005] The invention is based on the objective of overcoming the disadvantages of the prior art. In particular, it aims to provide an arc control device that is extremely efficient and capable of ensuring a highly uniform, shingled flow of arcs. Furthermore, it should be very easy and readily adaptable, especially automatically, to the specific arcs to be slowed. A corresponding system and method are also to be supplied.

[0006] This problem is solved according to the invention by the features specified in main claims 1, 13, and 14. The core of the invention lies in a sheet braking distance determination device capable of determining or measuring the braking distances of sheets from an initial sheet velocity or sheet receiving velocity to a sheet transport velocity of the sheet transport device, preferably continuously, preferably indirectly, particularly on the sheet transport device. Preferably, a point is determined at which the braking distance or deceleration of the respective sheet ends. In particular, the sheet braking distance determination device determines a length or width and / or duration of the respective braking distance. It is advantageous if the braking distance of at least every fourth sheet, preferably of every sheet, is determined.Preferably, the arc braking distance determination device detects at least one transverse edge of the arc whose braking distance is to be determined.

[0007] The detection area of ​​the arc braking distance determination device preferably extends adjacent to the arc braking device and / or adjacent to the arc transport device and / or downstream of it. The arcs move, for example under guidance, past the arc braking distance determination device, which is stationary, for the purpose of determining the braking distance.

[0008] The initial sheet velocity is located, for example, (immediately) downstream of an upstream sheet take-up device or in an upstream section of the sheet transport device, forming a start or receiving section. It is, for example, at least 100%, preferably at least 300%, preferably at least 500% higher than the sheet transport velocity. It is, for example, at most 2000%, preferably at most 1500%, preferably at most 1200% higher than the sheet transport velocity. The initial sheet velocity is advantageously between 3 and 15, preferably between 5 and 12, times faster / higher than the sheet transport velocity.

[0009] The sheet transport speed of the sheet transport device is preferably constant during operation or for a given order. It preferably corresponds (essentially) to the plant speed or production speed of the corrugated board machine. The sheet transport device preferably has at least one drive.

[0010] If the speed of the respective sheet on the sheet transport device corresponds to the speed of the sheet transport device itself, then preferably the relative speed between the sheet transport device and the sheet located or lying on it is zero. No relative movement between them then occurs. The sheet is then completely decelerated.

[0011] It is advantageous if the arc braking device includes at least one arc braking element capable of applying braking force to the arcs to be braked, particularly through friction. This at least one arc braking element is designed, for example, as a comb, spring plate, or brush. Ideally, at least one arc braking element is adjustable or adaptable in its braking force or effect to brake the arcs accordingly. For example, the arc braking element brakes the arcs uniformly.

[0012] The arc braking distance is preferably between 5 cm and 50 cm, more preferably between 10 cm and 30 cm. The processing unit is preferably designed as an electrical, and in particular electronic, processing unit. It is preferably a control and / or regulating unit and includes, for example, an evaluation unit. Advantageously, the processing unit is capable of receiving and processing signals, in particular electrical or electronic signals, relating to the arcs or the arc braking distance. The received arc braking distance signals relate to the braking distance of the arcs. In particular, they relate to the respective position and / or speed of the arcs. The arc braking distance signals are preferably electrical and advantageously characteristic or representative of the respective position and / or speed of the arcs.

[0013] The processing unit preferably actuates the sheet braking device such that a stream of uniformly staggered sheets, i.e., a sheet-shingle stream, is present on the sheet transport device. The uniform shingling of the sheets is achieved, in particular, by an (optimal) adjustment of the sheet braking distance. If the (respective) sheet braking distance is too long or too short, the distance between adjacent sheets, for example, will be uneven or non-constant. A process window is created or exists, in particular, within which the sheet braking device operates or brakes correctly. If the sheet braking distance is too long, the braking force of the sheet braking device is preferably increased. Conversely, if the sheet braking distance is too short, the braking force of the sheet braking device is preferably reduced. A sheet braking program is adapted, for example, to the sheet length, sheet thickness, and / or production speed. The sheets are preferably rectangular.Preferably, each sheet has two transverse edges running perpendicular to the sheet transport direction and two longitudinal edges or side edges extending in the sheet transport direction, which connect the transverse edges. A transverse edge leading in the sheet transport direction preferably forms a leading edge, while a corresponding trailing transverse edge of this sheet advantageously forms a trailing edge. It is advantageous if each sheet is flat and preferably has a first side, such as the top, and an opposite second side, such as the bottom. Preferably, the sheets are single-layered or multi-layered. They consist, for example, of paper, cardboard, or the like.

[0014] The at least one web production arrangement preferably comprises at least one web unwinding arrangement for unwinding at least one, preferably endless, web. Preferably, several web unwinding arrangements are provided. It is advantageous if the web production arrangement includes at least one device for producing at least one single-sided laminated corrugated board web from unwound webs. Advantageously, it also includes a laminating web unwinding device for unwinding a laminating web, particularly an endless one. It is advantageous if the web production arrangement includes a joining device for adhesively joining the at least one single-sided laminated corrugated board web and the laminating web together. The cross-cutting arrangement preferably includes at least one cross-cutting device for, in particular, completely cutting at least one web or partial web into sheets.Each cross-cutting device comprises, for example, at least one rotatably driven cross-cutting roller, which preferably has at least one radially extending blade. It is advantageous if the cross-cutting arrangement has at least one feed or insertion device upstream of the at least one cross-cutting device. It preferably comprises at least one sheet-pulling or sheet-dispensing device downstream of the at least one cross-cutting device, which preferably has at least one sheet-pulling or sheet-dispensing device, such as a roller or a pair of rollers.

[0015] Further advantageous embodiments of the invention are specified in the dependent claims.

[0016] Based on a specific braking distance, according to subclaim 2, for example, automatic pressure control of the arc braking device and / or enrichment of a pressure calculation model with data is performed. For example, a target arc braking distance is specified.

[0017] The separating device preferably has at least one movable sheet deceleration or sheet separating element, advantageously a plurality of such elements, which is preferably designed as a separating strip. The at least one sheet deceleration element preferably extends perpendicular to the sheet transport direction. It is advantageous if, during a new job or format change, the sheet deceleration element with its deceleration surface is brought into contact with a first sheet of the new format or job, so that this sheet is decelerated relative to the previous sheet, which is still in the old format, and thus spaced apart from it in the sheet transport direction. Another sheet deceleration element is preferably in a rest position. The previous sheet of the old format is preferably transported without delay. The deceleration surface comprises, for example, rubber, elastomer, or the like. It is preferably oriented upwards during operation.facing the arc to be delayed.

[0018] The embodiment according to subclaim 3 allows for an extremely precise determination of the respective arc braking distance or corresponding positions of the arcs during the braking process.

[0019] The design according to dependent claim 4 enables particularly reliable and simple transport of the sheets. It is advantageous if the sheet transport device comprises at least one, preferably endless, conveyor belt, a transport roller, or the like. The rotational speed of the sheet transport device is preferably constant during operation. It is advantageous if the sheet transport device forms a transport surface, particularly an upper one, for the sheets to be transported. The sheet transport speed preferably corresponds (essentially) to the rotational speed or speed of the sheet transport device, such as the conveyor belt, transport roller, or the like.

[0020] The at least one detection device according to dependent claim 5 is capable of detecting the arc-scale flow or the arcs arranged in a scale pattern. It is preferably an optical detection device. The at least one detection device operates, for example, with a laser, infrared, or the like. It is advantageous if it includes an evaluation unit or is at least temporarily in signal communication with such a unit. The at least one evaluation unit is, for example, a component of the processing unit. The at least one detection device is preferably arranged above and / or below the arcs, adjacent to them, but more preferably spaced apart. The at least one detection device is, for example, designed as a sensor device, camera device, or the like. The at least one detection device is preferably a distance detection device.For example, it has at least one detection unit that is designed to traverse and is capable of moving perpendicular to the arc-scale stream in its lateral or transverse direction, in particular horizontally, to detect the arc-scale stream. Alternatively, the at least one detection device may, for example, have several detection units arranged side by side perpendicular to the arc-scale stream in a lateral or transverse direction.

[0021] The at least one detection device according to dependent claim 6 is arranged at least partially, preferably completely, within the sheet transport device or its transport mechanism. The sheet transport device is advantageously designed as a sheet conveyor belt device, the sheet conveyor belt of which preferably spatially defines or encloses an interior space. The at least one detection device is arranged at least partially, for example completely, within this interior space. It is arranged below the sheet flux stream, with its detection area directed upwards towards the sheet flux stream. The sheet flux stream is detected from below. Such a design is extremely space-saving.

[0022] The placement of the at least one detection device according to dependent claims 7 and 8 is extremely user-friendly and easy to maintain. The at least one detection device is thus relatively easy to access, for example for cleaning or maintenance.

[0023] The arc braking distance determination device according to dependent claim 9 leads to an extremely precise determination of the respective arc braking distance. Advantageously, it determines or calculates the theoretical time when at least one arc in the arc flux is located adjacent to, or above, the at least one detection device. Preferably, it determines or measures an actual time when the respective arc is located in the arc flux adjacent to the at least one detection device. It is advantageous if the arc braking distance determination device tracks the at least one corresponding arc to be detected over a time or transport distance range, for example, from the cross-cutting arrangement or from its arc extraction device.

[0024] The comparison according to dependent claim 10 allows for an indirect determination of the range of each bow. The actual range of each bow is determined subsequently. A conclusion is drawn about the actual range of each bow. The actual range of each bow is not measured directly.

[0025] According to dependent claim 11, the transport path is tracked. This is achieved, for example, by attaching at least one transport path tracking sensor to the sheet transport device or its sheet conveyor belt. The at least one transport path tracking sensor is preferably detectable by means of a transport path tracking sensor acquisition unit, which is advantageously stationary. A corresponding output signal can be generated or supplied. According to dependent claim 12, the sheet braking distance determination device knows the respective sheet transport speed of the sheet transport device, in particular of the sheet conveyor belt or the sheets transported on it. This is achieved, for example, by placing at least one transport speed sensor on the sheet transport device or on a sheet conveyor belt thereof.The at least one transport speed sensor is preferably detectable by means of a transport speed sensor acquisition unit, which is advantageously stationary. A corresponding output signal can be generated or supplied. The transport path tracking sensor and the transport speed sensor are identical or different. Alternatively or additionally, the sheet transport speed of the sheet transport device is known from a previous order or from the operation of the sheet control arrangement.

[0026] Subclaims 2 to 12 also relate to advantageous further developments of the method according to main claim 14.

[0027] The terms used here, such as "pre-order", "sub-order", "upstream", "downstream", "front", "back" or the like, refer in particular to the direction of arc transport or the arcs being transported.

[0028] Signals can advantageously be transmitted via the specified signal connections. These signal connections can be wireless or wired. Preferred embodiments of the invention are described below by way of example with reference to the accompanying drawing. The drawing shows:

[0029] Fig. 1 shows a simplified section of a device according to the invention.

[0030] Corrugated board plant,

[0031] Fig. 2 is essentially a simplified side view of a sheet-influencing arrangement according to the invention for the corrugated board plant partially shown in Fig. 1, according to a first embodiment.

[0032] Fig. 3 essentially shows a simplified side view of a sheet-influencing arrangement according to the invention for the corrugated board plant shown in Fig. 1, according to a second embodiment, and

[0033] Fig. 4 is essentially a simplified side view of a sheet-influencing arrangement according to the invention for the corrugated board plant partially shown in Fig. 1, according to a third embodiment.

[0034] Referring initially to Fig. 1, a corrugated board plant, only partially shown therein, comprises a diverter 1 that divides an endless, double-sided laminated corrugated board web (not shown) into different layers. This web is produced by a longitudinal cutting / creasing device (not shown) of the corrugated board plant. The corrugated board web originates from a corrugated board web production arrangement (not shown). The corrugated board plant also has a cross-cutting arrangement 3, which is located downstream of the diverter 1 and includes cross-cutting devices. The cross-cutting devices are preferably identical and arranged one above the other. Each corrugated board web 2 is assigned a cross-cutting device for completely cutting the respective corrugated board web 2 into individual corrugated board sheets.

[0035] Furthermore, each cross-cutting device is connected to a sheet-influencing arrangement 4 of the corrugated board machine. The sheet-influencing arrangements 4 are preferably identical and advantageously arranged one above the other. One sheet-influencing arrangement 4 will be discussed in more detail below.

[0036] Furthermore, the corrugated board plant includes a stacking tray 5 with stacking devices 6. Each stacking device 6 has a height-adjustable stacking table 7. The stacking tray 5 has conveyor belt devices 8 that convey the corrugated board sheets, which are influenced by the sheet control devices 4, in particular slowed down, to the stacking devices 6.

[0037] The following section describes in more detail a sheet handling arrangement 4 with reference to Fig. 2. In Fig. 2, a corrugated board sheet is designated by the reference numeral 11. Each cross-cutting device has a sheet take-up device with two sheet take-up units 9, which are arranged one behind the other in a sheet transport direction 10. The sheet take-up units 9 serve to precisely guide the corrugated board sheets 11. Each sheet take-up unit 9 comprises a pair of take-up rollers with an upper take-up roller 12 and a lower take-up roller 13. The upper and / or lower take-up rollers 12, 13 are rotatably driven. The corrugated board sheets 11 are each guided through a take-up gap of the respective sheet take-up unit 9, which is limited by the upper take-up roller 12 and the lower take-up roller 13.

[0038] As can be seen from Fig. 2, the bow influencing arrangement 4 is downstream of the bow extraction devices 9 in the bow transport direction 10.

[0039] The sheet handling device 4 has a sheet transport device 14 with guide / deflection rollers 15 and an endless sheet conveyor belt 16 guided around the guide rollers 15. The sheet transport device 14 is spaced downstream of the sheet take-up device. The sheet conveyor belt 16 rests against the outside of the guide rollers 15. It forms a sheet transport surface 17 on its upper side, preferably flat and horizontal. At least one guide roller 15 is preferably rotatably driven. The sheet transport device 14 therefore includes at least one sheet transport drive (not shown). During operation, the sheet conveyor belt 16 is driven at a constant rotational speed.

[0040] The arc control arrangement 4 further comprises an arc braking device 18, which is arranged above the arc transport device 14. The arc braking device 18 has a holding device 19 that extends in the arc transport direction 10. It also includes several arc braking devices 20, which are arranged one behind the other at intervals in the arc transport direction 10 and are held by the holding device 19. Each arc braking device 20 has a comb-like or plate-like brake brush body 21. Each arc braking device 20 also includes an adjustment drive 22, which is directly or indirectly connected to the respective brake brush body 21 and is capable of adjusting it. Each adjustment drive 22 preferably has a motor, a piston-cylinder unit, or the like. For example, the brake brush bodies 21 can be adjusted together or independently of one another.They are, for example, movable and / or swiveling. Alternatively, not all brake brush bodies 21 are adjustable. For example, only one brake brush body 21 is adjustable, such as movable and / or swiveling.

[0041] Each brake brush body 21 has a lower free end 23 that runs adjacent to an upper area or upper run of the arc conveyor belt 16. Each lower free end 23 is arranged adjacent to the arc transport surface 17.

[0042] During operation, the corrugated board sheets 11 to be slowed down are located between the upper section or top run of the sheet conveyor belt 16 and the lower free ends 23 of the braking brush bodies 2E. The corrugated board sheets 11 rest on the outer surface of the sheet conveyor belt 16 or the sheet transport surface 17. The braking brush bodies 21 press the corrugated board sheets 11 downwards against the upper section of the sheet conveyor belt 16 or the sheet transport surface 17 with their lower free ends 23, thereby slowing down the corrugated board sheet 11 located there and creating a shearing stream of corrugated board sheets 11 on the sheet conveyor belt 16. The braking brush bodies 21 preferably form a braking line or braking area on the respective corrugated board sheet 11 to be slowed down, which extends perpendicular to the sheet transport direction 10. The corrugated board plant also has a separating device 24 with several, such as ten, separating strips 25.The separating strips 25 extend perpendicular to the sheet transport direction 10 and are preferably adjustable along a closed guide track. Their distance from each other is fixed or constant in one direction of travel. The separating device 24 is located downstream of the sheet transport device 14 and adjacent to another sheet transport device that receives the corrugated board sheets 11 from the sheet transport device 14. For simplicity, only two separating strips 25 are shown.

[0043] The sheet control arrangement 4 also has an electrical, in particular electronic, processing unit 26. The processing unit 26 is at least temporarily in signal communication with a control unit 27 of the cutting device 24 for controlling the cutting bars 25. It is also at least temporarily in signal communication with a control unit 28 of the sheet braking device 18, which in turn is at least temporarily in signal communication with the adjustment drives 22.

[0044] Furthermore, the processing unit 26 is at least temporarily in signal communication with a detection device 29, which is located between the rear sheet extraction device 9 and the separating device 24.

[0045] The detection device 29 is arranged below the sheet-scale stream in the sheet-control arrangement 4, in particular in the sheet-transport device 14. It is housed in an interior space 35 bounded by the sheet-transport belt 16. It is specifically located between the sheet-transport surface 17, which forms the upper run, and a lower run 36 of the sheet-transport belt 16. The detection device 29 is arranged between the guide rollers 15. It is, for example, located adjacent to the last / rearmost sheet-braking device 20 in the sheet-transport direction 10 and extends horizontally. It runs perpendicular to the direction of rotation of the sheet-transport belt 16 or to the sheet-transport direction 10 in a width or transverse direction of the sheet-transport belt 16 or the sheet-scale stream. The detection device 29 extends at least over a partial width, for example over the entire width, of the curved conveyor belt 16 orof the bow-shed stream.

[0046] The detection device 29 has at least one laser unit capable of detecting the arc flaking stream from below during operation. A laser beam or laser field generated by the at least one laser unit extends, for example, vertically, inclined in or against the arc transport direction 10.

[0047] The function of the sheet influencing arrangement 4 is described in more detail below. The corrugated board sheets 11 produced by cross-cutting are drawn out or ejected from the sheet drawing devices 9 at a sheet drawing speed.

[0048] The corrugated cardboard sheets 11 produced by cross-cutting fly at a sheet speed that (essentially) corresponds to the sheet pull-out speed onto the adjacent or upstream area of ​​the downstream sheet conveyor belt 16.

[0049] Each corrugated board sheet 11 is then slowed down or decelerated on the sheet conveyor belt 16 by the sheet braking devices 20 using the resulting frictional force, for example, uniformly, until its sheet speed exactly corresponds to the rotational speed of the sheet conveyor belt 16. Initially, it slides along the sheet conveyor belt 16 in the sheet transport direction 10, and a relative movement occurs between the corrugated board sheet 11 and the sheet conveyor belt 16, which moves in the same direction at the sheet transport surface 17. The relative movement decreases during the braking process. A braking distance of the corrugated board sheet 11 is completed when it is conveyed on the sheet conveyor belt 16 in the sheet transport direction 10 at a sheet speed that corresponds to the peripheral speed or sheet transport speed of the sheet conveyor belt 16. A relative speed orThe relative motion between the corrugated cardboard sheet 11 and the sheet conveyor belt 16 is then zero. The corrugated cardboard sheet 11 is therefore completely decelerated when the distances traveled by the corrugated cardboard sheet 11 and the sheet conveyor belt 16 per unit of time are identical. The deceleration distance of the respective corrugated cardboard sheet 11 essentially represents its throwing range.

[0050] After the sheet braking devices 20 or the braking, the corrugated board sheet 11 is transported on the sheet conveyor belt 16 at a constant sheet transport speed of the sheet conveyor belt 16 and reaches the separating device 24 or the further sheet transport device.

[0051] The detection device 29 operates continuously and detects the corrugated board sheets 11 from below, specifically their trailing transverse edges 31 (rear edges). In particular, each corrugated board sheet 11, or each trailing transverse edge 31, is detected. Each corrugated board sheet 11 also has a leading transverse edge 30 (front edge). The detection device 29 detects a sawtooth pattern or profile through the trailing transverse edges 31. It preferentially detects the corrugated board sheet 11 that is currently passing over it.

[0052] A sensor 32 is arranged on / in the sheet conveyor belt 16. The sensor 32 is located, for example, in a side and / or central area of ​​the sheet conveyor belt 16. It rotates with the sheet conveyor belt 16 during operation. A stationary sensor sensing unit is assigned to the sensor 32. This allows, for example, the rotational speed of the sheet conveyor belt 16 or the sheet transport speed to be determined or calculated.

[0053] The path of the corrugated board sheet 11 to be detected is tracked. The trailing transverse edge 31 of the corrugated board sheet 11 to be detected is tracked, in particular from the point of cross-section to the separating device 24. It is known which path the corrugated board sheets 11 travel, or have traveled, in the sheet transport direction 10 up to the detection device 29, for example, after leaving the downstream sheet extraction device 9 or on the sheet conveyor belt 16.

[0054] The sheet braking distance determination device determines, firstly, a theoretical time when a detected corrugated board sheet 11 is located, or should be located, above the detection device 29. By tracking the path, the device can determine, in particular, the theoretical time when the trailing transverse edge 31 of this corrugated board sheet 11 is at the level of the detection device 29. The sheet braking distance determination device advantageously has a corresponding determination or calculation unit for this purpose. The actual position of the corrugated board sheet 11 on the sheet conveyor belt 16 is also determined. The sheet braking distance determination device determines an actual time when the detected corrugated board sheet 11, or rather its trailing transverse edge 31, is actually located above the detection device 29. This determination is carried out using the detection device 29. The sheet braking distance determination device has a corresponding measuring unit for this purpose.

[0055] The sheet-braking distance determination device compares the theoretical and actual times of the corrugated cardboard sheet 11 being detected. It preferably uses a corresponding reference unit for this purpose. Generally, a time deviation is detected. Depending on this time deviation, the sheet-braking distance determination device calculates a deviation between the theoretical and actual range of the respective corrugated cardboard sheet 11. The deviation between the theoretical and actual positions of the corrugated cardboard sheet 11 corresponds exactly to the deviation between the theoretical and actual range of the corrugated cardboard sheet 11.

[0056] The throw distance of each corrugated board sheet 11 is therefore only determined after it has already been decelerated. A deduction is made to determine where the corrugated board sheet 11 landed on the sheet conveyor belt 16. The determination of the throw distance is indirect. A target-actual comparison of the times takes place. The well-known formula v = s / t or s = v*t is used to calculate the throw distance, where v represents the velocity of the decelerated corrugated board sheet 11, s represents the throw distance of the corrugated board sheet 11, and t represents the time required for the corrugated board sheet 11 to travel from the rear sheet feed unit 9 to the detection unit 29.

[0057] The controlled placement of the corrugated board sheets 11 onto the sheet conveyor belt 16 creates a shingled stream of corrugated board sheets 11, which is transported via the separating device 24 to the stacking tray 5 and stacked there. Adjacent corrugated board sheets 11 overlap each other in the shingled stream on the sheet conveyor belt 16.

[0058] For a stable process, the braking force applied to the corrugated board sheets 11 by the sheet braking device 18 is adjusted to the respective production conditions. These include, for example, the production speed or machine speed, the format of the produced corrugated board sheets 11, the type of corrugated board produced, and / or the paper / cardboard used for production. The aim is to achieve the most consistent possible throw distance of the corrugated board sheets 11. The corrugated board sheets 11 are then arranged essentially identically to one another, resulting in extremely uniform shingling. The throw distance is determined and processed in each case. By determining the respective braking distance of the corrugated board sheets 11, the most consistent possible throw distances of the corrugated board sheets 11 can be achieved.

[0059] The braking pressure of the sheet-braking device 18 is adjustable based on the determined throw distance of the corrugated board sheets 11, particularly by means of a control system. The sheet-braking device 18 is adjusted during the braking process depending on positional information obtained for the corrugated board sheets 11. The braking force of the sheet-braking device 18 is set to an optimal throw distance depending on the production conditions. This results in particularly high stacking accuracy and production reliability. Such adjustment is extremely complex in state-of-the-art sheet-control arrangements and highly dependent on the experience of the respective operator or user.

[0060] During stack separation by the separating device 24, the system reacts to the exact position of the last corrugated board sheet 11 of the finished stack and the first corrugated board sheet 11 of the new stack. The corrugating machine is able to track a separation point up to the separating device 24 and synchronize itself to the actual position of the corrugated board sheet 11. Separation accuracy can thus be improved.

[0061] An alternative embodiment is described below with reference to Fig. 3. Reference is made to the previous description. In comparison with the previous embodiment, the detection device 29 is located downstream of the sheet transport device 14. The detection device 29 is arranged between the sheet transport device 14 and the separating device 24. It is, for example, located below the sheet conveyor belt 16 and below the separating device 24.

[0062] A laser beam or laser field emitted by the detection device 29 thus extends between the arc conveyor belt 16 and the cutting device 24. The laser beam or laser field then meets the arc flaking stream from below.

[0063] A further alternative embodiment is described below with reference to Fig. 4. Reference is made to the previous description. In comparison with the previous embodiments, the detection device 29 is arranged here between the sheet transport device 14 and a sheet supplementary transport device 33, which is directly downstream of the sheet transport device 14 and thus located between the sheet transport device 14 and the separating device 24. The sheet supplementary transport device 33 has a continuously rotating, driven sheet supplementary transport belt 34, which forms a sheet supplementary transport surface for the corrugated board sheets 11 at the top.

[0064] The detection device 29 is arranged below the sheet conveyor belt 16 and the sheet auxiliary conveyor belt 34. A laser beam or laser field emitted by it during operation extends between the sheet conveyor belt 16 and the sheet auxiliary conveyor belt 34 and strikes the sheet flux stream from below.

[0065] Combinations of the embodiments are possible.

Claims

Patent claims 1. Sheet-controlling arrangement for influencing sheets (11), in particular corrugated board sheets, transported in a sheet-transport direction (10), comprising a) a sheet-transport device (14) for transporting received sheets (11) in a sheet-transport direction (10) at a sheet-transport speed, b) a sheet-braking device (18) associated with the sheet-transport device (14) for decelerating the sheets (11) on the sheet-transport device (14) from an initial sheet speed to the sheet-transport speed, forming a sheet-flake stream, c) a sheet-braking distance determination device for determining braking distances of the sheets (11) from the initial sheet speed to the sheet-transport speed of the sheet-transport device (14), and d) a processing unit (26).the arc braking distance signals relating to the braking distances of the arcs (11) are at least temporarily in signal contact with the arc braking distance determination device.

2. Sheet control arrangement according to claim 1, characterized in that the processing unit (26) is at least temporarily in signal communication with the sheet braking device (18) for actuating the same depending on the sheet braking distance signals and / or with a separating device (24) downstream of the sheet transport device (14) for separating different orders from each other.

3. Arc control arrangement according to claim 1 or 2, characterized in that absolute positions of the arcs (11) during the respective arc braking distance can be determined by means of the arc braking distance determination device.

4. Sheet control arrangement according to one of the preceding claims, characterized in that the sheet transport device (14) comprises a sheet transport unit (16) which in operation has a rotational speed corresponding to the sheet transport speed.

5. Bow control arrangement according to one of the preceding claims, characterized in that the bow braking distance determination device has at least one detection device (29) for detecting transverse edges (30, 31), in particular trailing edges (31), of the bows (11) in the bow flux.

6. Sheet control arrangement according to claim 5, characterized in that the at least one detection device (29) is arranged at least partially within the sheet transport device (14).

7. Sheet influencing arrangement according to claim 5, characterized in that the at least one detection device (29) is arranged between the sheet transport device (14) and a separating device (24).

8. Sheet control arrangement according to claim 5, characterized in that the at least one detection device (29) is arranged between the sheet transport device (14) and a sheet auxiliary transport device (33) downstream of the sheet transport device (14).

9. Bow control arrangement according to one of claims 5 to 8, characterized in that the bow braking distance determination device determines a) a theoretical time when at least one bow (11), preferably each bow (11), is located in the bow fluff stream adjacent to the at least one detection device (29), and b) an actual time when the respective bow (11) is located in the bow fluff stream adjacent to the at least one detection device (29).

10. Bow control arrangement according to claim 9, characterized in that the bow braking distance determination device compares the theoretical time and the actual time and determines a deviation between a theoretical range and the actual range of the respective bow (11) depending on a time deviation.

11. Bow control arrangement according to one of the preceding claims, characterized in that the bow braking distance determination device tracks a transport path of the bow transport device (14) and / or the bow flaking stream.

12. Bow influencing arrangement according to one of the preceding claims, characterized in that the bow braking distance determining device controls the bow transport speed of the bow transport device (14).

13. Plant, in particular corrugated board plant, comprising a) a web production arrangement for producing at least one web (2), b) a cross-cutting arrangement downstream of the web production arrangement for cutting the at least one web (2) into sheets (11), and c) at least one sheet-influencing arrangement (4) downstream of the cross-cutting arrangement according to one of the preceding claims.

14. Method for influencing sheets (11) transported in a transport direction (10), in particular corrugated cardboard sheets, comprising the steps Transporting received sheets (11) in a sheet transport direction (10) at a sheet transport speed by means of a sheet transport device (14), Deceleration of the arcs (11) on the arc transport device (14) from an initial arc velocity to the arc transport velocity by means of an arc braking device (18) associated with the arc transport device (10) forming an arc flux stream, Determining the braking distances of the arcs (11) from the arc's initial velocity to the arc's transport velocity Bow transport device (14) by means of a bow braking distance determining device, and Providing a processing unit (26) which is at least temporarily in signal communication with the arc braking distance determination device for receiving arc braking distance signals relating to the braking distances of the arcs (11).

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