EP3619153B1 - Apparatus and method for positionally defined transport of sheets - Google Patents

Apparatus and method for positionally defined transport of sheets Download PDF

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Publication number
EP3619153B1
EP3619153B1 EP18734471.8A EP18734471A EP3619153B1 EP 3619153 B1 EP3619153 B1 EP 3619153B1 EP 18734471 A EP18734471 A EP 18734471A EP 3619153 B1 EP3619153 B1 EP 3619153B1
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EP
European Patent Office
Prior art keywords
suction
sheets
sheet
shingling
braking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18734471.8A
Other languages
German (de)
French (fr)
Other versions
EP3619153C0 (en
EP3619153A1 (en
Inventor
Andreas Schilling
Hansj rg KLEIN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BW Papersystems Stuttgart GmbH
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BW Papersystems Stuttgart GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BW Papersystems Stuttgart GmbH filed Critical BW Papersystems Stuttgart GmbH
Priority to EP22203800.2A priority Critical patent/EP4144677A1/en
Publication of EP3619153A1 publication Critical patent/EP3619153A1/en
Application granted granted Critical
Publication of EP3619153C0 publication Critical patent/EP3619153C0/en
Publication of EP3619153B1 publication Critical patent/EP3619153B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/68Reducing the speed of articles as they advance
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/68Reducing the speed of articles as they advance
    • B65H29/686Pneumatic brakes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/66Advancing articles in overlapping streams
    • B65H29/6609Advancing articles in overlapping streams forming an overlapping stream
    • B65H29/6618Advancing articles in overlapping streams forming an overlapping stream upon transfer from a first conveyor to a second conveyor advancing at slower speed
    • B65H29/6636Advancing articles in overlapping streams forming an overlapping stream upon transfer from a first conveyor to a second conveyor advancing at slower speed in combination with auxiliary means for underlapping articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/24Delivering or advancing articles from machines; Advancing articles to or into piles by air blast or suction apparatus
    • B65H29/241Suction devices
    • B65H29/242Suction bands or belts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/66Advancing articles in overlapping streams
    • B65H29/6654Advancing articles in overlapping streams changing the overlapping figure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26DCUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/27Means for performing other operations combined with cutting
    • B26D7/32Means for performing other operations combined with cutting for conveying or stacking cut product
    • B26D2007/322Means for performing other operations combined with cutting for conveying or stacking cut product the cut products being sheets, e.g. sheets of paper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00Handling processes for sheets or webs
    • B65H2301/40Type of handling process
    • B65H2301/44Moving, forwarding, guiding material
    • B65H2301/447Moving, forwarding, guiding material transferring material between transport devices
    • B65H2301/4473Belts, endless moving elements on which the material is in surface contact
    • B65H2301/44732Belts, endless moving elements on which the material is in surface contact transporting articles in overlapping stream
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00Parts for transporting or guiding the handled material
    • B65H2404/60Other elements in face contact with handled material
    • B65H2404/65Other elements in face contact with handled material rotating around an axis parallel to face of material and perpendicular to transport direction, e.g. star wheel
    • B65H2404/651Other elements in face contact with handled material rotating around an axis parallel to face of material and perpendicular to transport direction, e.g. star wheel having at least one element, e.g. stacker/inverter
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00Means using fluid
    • B65H2406/30Suction means
    • B65H2406/32Suction belts
    • B65H2406/323Overhead suction belt, i.e. holding material against gravity
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10Size; Dimensions
    • B65H2511/11Length
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20Location in space
    • B65H2511/22Distance
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00Problem to be solved or advantage achieved
    • B65H2601/30Facilitating or easing
    • B65H2601/32Facilitating or easing entities relating to handling machine
    • B65H2601/324Removability or inter-changeability of machine parts, e.g. for maintenance
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00Handled material; Storage means
    • B65H2701/10Handled articles or webs
    • B65H2701/17Nature of material
    • B65H2701/176Cardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/66Advancing articles in overlapping streams
    • B65H29/6609Advancing articles in overlapping streams forming an overlapping stream
    • B65H29/6618Advancing articles in overlapping streams forming an overlapping stream upon transfer from a first conveyor to a second conveyor advancing at slower speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00Feeding articles separated from piles; Feeding articles to machines
    • B65H5/24Feeding articles in overlapping streams, i.e. by separation of articles from a pile

Definitions

  • the invention relates to a device, in particular what is known as a roll cross cutter, for forming an imbricated stream of overlapping sheets, in particular paper or cardboard sheets, with a transport device for transporting sheets, with an imbricating device for overlapping the sheets in certain areas, with a flow in the transport direction of the sheets
  • the shingling device is followed by a braking device for braking shingled sheets, in particular by forming a braking gap for the passage of sheets brought together in a shingled manner, and with a transverse cutting device upstream of the shingling device for cutting a strip of material into individual sheets.
  • the invention relates to a method for forming an imbricated stream of underlapping
  • Sheets in particular of foils, sheets of paper or cardboard, in particular for the formation of an imbricated stream of individual sheets cut from a strip of material using a cross cutter, with individual sheets being transported to a shingling device and overlapped in some areas in order to produce a shingled stream, and with the shingled Sheets are braked with a braking device that follows in the transport direction of the sheets of the shingling device.
  • a roll sheeter is, for example, from DE 101 03 040 A1 known.
  • sheets of paper or cardboard can be provided as a quasi-endless band in the form of a paper roll.
  • the strip is fed to a cross-cutting device, where it is cut into sheets of a defined length.
  • a paper reservoir is often connected upstream of the feed device in order to keep available a certain web length of the paper.
  • the cut sheets are fed to a shingling device with the help of high-speed conveyor belts to form an underlap of the sheets.
  • the shingling device includes a lifting shaft and a suction belt arranged above it.
  • the sheets running through the shingling device are lifted at a defined point on the sheets, in particular in relation to the trailing edge of the sheets, by the lifting shaft in relation to the transport plane and are pressed onto the suction belt arranged above.
  • the suction belt has a lower peripheral speed than the high-speed conveyor belts that transport the sheets from the cross-cutting device. The bow is thus decelerated when the trailing edge of the bow is lifted by the lifting beam is pressed and held by the suction belt arranged above it.
  • the scale device acts as the first, rear brake unit.
  • a braking device is arranged downstream of the shingling device in the transport direction of the shingled stream as a second, front braking unit.
  • a braking device is, for example, in DE 38 12 685 A1 described.
  • the braking device can have at least one so-called nip roller, which forms a braking gap together with a conveyor belt, another roller or a roller.
  • the distance between the braking device and the stacking device is set in such a way that the leading sheet edge of a sheet preferably just enters the braking gap of the braking device and is decelerated when the rear sheet area, in particular the trailing edge of the sheet, is pressed onto the suction belt by the lifting shaft of the stacking device .
  • the sheet is braked or decelerated preferably simultaneously by the nip roller in the front sheet area and by the suction belt of the shingling device in the rear sheet area.
  • the simultaneous deceleration of the sheet in the area of its leading and trailing edge prevents the sheet from rippling during braking.
  • the trailing sheet has a higher speed than the leading sheet that has already been turned up. Since the leading sheet is held up with its trailing edge on the suction belt, the leading edge of the trailing sheet can be conveyed under the leading sheet. Thus, due to the difference in speed between the leading and trailing sheets, the sheets will overlap. In this way, a continuous imbricated stream is generated. Following the braking device, the shingled stream formed by the underlapped sheets is transported at the same speed and with the same shingle length of the underlapped sheets onto a transfer table with slow-running conveyor belts to a further processing machine.
  • the sheets are braked at approximately the same time at their leading and trailing edges.
  • the sheets can sag, with a sagging leading sheet being able to impede the forward movement of a following sheet. This can lead to problems with the positioning accuracy of the following sheets at the braking nip.
  • the arches are pulled up by the suction belt after being pushed up by the beater shaft, held and then tightened or tensioned.
  • the sheets are tensioned by setting the speed of the suction belt slightly lower than the speed of the nip rollers of the braking device. Due to the tensile forces exerted on the sheet by the difference in speed between the nip rollers and the suction belt, the sheet is tensioned and sagging is reduced. If the leading sheet is conveyed out of the engagement area of the suction belt, it is no longer held by the suction belt. A falling sheet would impede the front edge of the trailing sheet in such a way that it would no longer be possible to shingle under in a defined position. Due to the higher friction caused by the dead weight of the leading sheet, the faster running following sheet would be hindered in its forward movement.
  • a cycle is the length of time between the beating up of a first leading sheet and the beating up of a second trailing sheet. This ensures that the leading sheet, when it leaves the area of influence of the suction belt, is held up by a trailing sheet that has been turned up and already sucked in, since the trailing edge of the trailing sheet is then already in the effective area of the suction belt and the trailing sheet the leading one holding up bow. Accordingly, the suction belt must apply a sufficiently high suction capacity in order to be able to securely hold both the folded sheets and the sheets held by the folded sheets.
  • the object of the present invention is to provide a device and a method of the type mentioned at the outset, which enable a precise or defined feed of a trailing sheet in the sheet flow into the braking device. In addition, even at high transport speeds, damage caused by the sheets entering the braking device in an inaccurate manner should be reliably avoided.
  • the above-mentioned object is achieved according to the invention in that in the region between the shingling device and the braking device, a suction section, preferably below the transport plane of the sheets, is provided for further transport of the sheet leading edge of a sheet following in the shingled stream into the braking device. Accordingly, in the method according to the invention, it is provided that the following sheets of an imbricated flow are transported into the braking device preferably from below under the effect of suction.
  • the invention is based on the basic idea of feeding the front edges of the following sheets to the braking device in a defined manner by means of suction in the region between the shingling device and the braking device.
  • the leading edge of a trailing sheet is in this case at least partially moved further relative to a leading sheet, the leading edge of the sheet being sucked in from below in the event of shingling and being located below a leading sheet. This significantly increases the positioning accuracy of the leading edge and thus of the entire sheet.
  • the invention can also be used to prevent damage to the sheet at the braking point, which can result from inaccuracies in the position of the leading edge.
  • the suction path is formed, for example, in the case of shingling, by generating a negative pressure below the transport level of the sheets.
  • At least one suction device is provided to form a suction path.
  • the suction device can interact with at least one suction belt, which is moved in the transport direction and is used to transport the sheets further after they have passed the shingling device.
  • the negative pressure generated by the suction device is designed in such a way that at least the leading edge or a region of the leading edge of a sheet is held in place in such a way that the sheet is transported in a desired position with precise positioning.
  • the suction section is preferably formed by a plurality of suction belts which are arranged one behind the other transversely to the transport direction and run parallel to one another.
  • the sheets are sucked in and transported via the suction belts.
  • Each of the suction belts can be assigned its own suction device. However, it is also possible that only a single suction device, for example a suction box, is provided, via which negative pressure is generated for all suction belts.
  • the suction path to be formed by a plurality of conveyor belts, which are arranged one behind the other transversely to the transport direction and run parallel to one another, with no negative pressure then being generated via the conveyor belts.
  • suction zones located between the conveyor belts can be formed to generate negative pressure. The suction device is then designed to generate a negative pressure in the area of the suction zones, which acts on the sheets and pulls them against the conveyor belts during sheet transport by means of the conveyor belts.
  • a sheet whose front edge reaches the area of the suction path is attracted at least in the area of the front edge of the sheet and is thus transported in a defined position in the transport direction of the sheets.
  • the front edge of the sheet is fixed on at least one suction belt or conveyor belt in such a way that the front edge of the sheet does not become detached during transport. For this reason, the leading edge of the sheet can be transported into a braking gap of the braking device without being damaged.
  • the trailing edge of the sheet in the shingling device can be pressed simultaneously with the entry of the leading edge of the sheet into the braking device by a beater shaft of the shingling device against a suction belt of the shingling device arranged above it.
  • the trailing edge of the sheet is then held up by the suction belt of the shingling device and simultaneously decelerated in the area of the sheet leading edge and the sheet trailing edge.
  • the trailing sheet can continue to be located on the high-speed transport device, with at least the area of its leading edge reaching the area of the suction section.
  • the trailing sheet is at a higher speed relative to the leading sheet with a defined location or position in the transport direction of the sheets conveyed below the leading sheet to the braking device.
  • Another suction section is provided between the cross cutter and the shingling device.
  • the suction section between the shingle device and the braking device and the further suction section can be formed with the same suction device or with several separate suction devices.
  • the additional suction section is used to transport the sheets in a desired position and location in a defined manner from the cross cutter to the shingle device. This achieves a high level of positioning accuracy for the sheets, which is necessary since both the cross cutter and the shingling device have to work in the same cycle as the further processing machine. Because of this clocking, it is important that the leading edge of the sheet assumes a position or position that is defined at that point in time. Of course, the positional accuracy refers to the entire arc.
  • the suction path between the shingled device and the braking device and the further suction path in the region of the shingled device are interrupted. Between the suction section between the shingling device and the braking device and the further suction section there is then an area in the transport plane of the sheets in which no negative pressure or a significantly lower negative pressure is generated. This is particularly advantageous if the rear edge of the sheet is turned up by means of a beater shaft. This makes it easier to turn up the trailing edge of a sheet, since no or a significantly reduced suction force acts on the trailing edge of the sheet when it is turned up.
  • the suction section is designed in such a way that the sheet is sucked in at least in the area of the leading edge and is conveyed in a defined position in the transport direction while and after the sheet trailing edge is gripped by the beater shaft and pressed against the suction belt of the stacking device above it. Because in the area of Racquet shaft of the shingling device has no or significantly reduced suction force on the sheet, the stresses that a sheet experiences when it is turned up are reduced. A strong suction effect on the trailing edge of a sheet when it is folded up could result in the sheet being damaged when it is folded up or slipping out of its defined position.
  • the pressure level in the area of the suction section between the shingle device and the braking device is lowered less than in the area of the further suction section between the cross cutter and the shingle device.
  • less strong means that the pressure difference between the negative pressure generated in the intake section between the shunting device and the braking device and the ambient pressure is less strong than in the area of the further intake section.
  • the result of this is that the sheet is pulled with great force in the area between the cross cutter and the shingling device in order to achieve high positional accuracy.
  • the sheet, or at least the leading edge of the sheet is attracted less strongly in the area of the intake path between the shingling device and the braking device.
  • the different levels of vacuum on both sides of the shingle device enable precise and rapid sheet transport from the cross cutter to the braking device.
  • the pressure reduction can also be significantly higher and a pressure reduction compared to the ambient pressure of 0.5 to 10 mbar, preferably between 1 to 5 mbar, in particular up to 2 mbar, can be provided.
  • the pressure drop in the area of the further intake path ie in the area between the cross cutter and the shingle device, is ten to a hundred times greater than in the area between the shingle device and the braking device. Due to the stronger negative pressure, the sheets are transported from the cross cutter to the shingling device in the exact position.
  • the shingling device is designed to be adjustable in and/or counter to the transport direction of the sheets, depending on the cut length. This enables the device to be easily adapted to a changed sheet format.
  • the term "cut length-dependent" refers to a change in the arrangement of the shingling device relative to the cross cutter and, preferably, relative to the braking device, for a format change of the sheet.
  • the braking device is designed so that it cannot be adjusted in and/or counter to the transport direction of the sheets. The distance between the transfer point and the braking device is therefore the same for every sheet format, i.e. it is independent of the cutting length.
  • the shingling device can then be moved, offset or shifted relative to the braking device in or counter to the transport direction of the sheets, so that for each adjustable sheet length, a leading sheet is removed from the braking device at the front and from the rear at about the same time Schupp worn is braked.
  • the distance between the transfer point and the braking device or the transfer length constant during a format change, with the braking device preferably not being adjusted during a format change.
  • the distance between the braking device which is preferably arranged in a stationary manner, and the shingling device is adapted to the actual sheet length by adjusting the shingling device.
  • the distance between the front transfer point of the sheets to a sheet processing machine and the braking device or the transfer length for different formats or cutting lengths remains the same, which leads to a considerable simplification when setting the device to a different sheet format.
  • the transfer length remains the same, there is no need to change the overlapping length of the sheets in the shingled stream when there is a format change.
  • a defined stopping point of the device can be defined, which is the same for every sheet format.
  • the degree of overlapping or the overlap length can be kept the same for each sheet format with a fixed distance between the transfer point and the braking device.
  • the length between the transfer point and the braking device corresponds exactly to an integer multiple of the shingle length.
  • phasing means that the relative position of the sheets to the beater shaft and the position of the knives on the cross cutting device always assume a fixed position relative to one another. A system start is therefore possible in a simple manner and in a short time.
  • the device can be prevented from being stopped when the transverse cutter is in the process of cutting. Stopping the device while the cross-cutting device is in the process of making the cut can lead to uncontrolled damage to the sheet and/or the material web. In this respect, stopping the device during the cut is to be avoided. Since the trailing sheet has the shingling length or the overlapping length as a buffer compared to the leading sheet that has already been turned up, the slow-moving conveyor belts and the cross-cutting device can be stopped in a targeted manner such that the cross-cutting device stops outside the cut.
  • the transport device has at least one suction belt, in particular a belt arrangement with several suction belts running parallel to one another, with the suction belt being guided continuously in the transport direction of the sheets from the cross cutter to the braking device, i.e. over both suction sections and the area of the shingling device.
  • a suction belt in particular a belt arrangement with several suction belts running parallel to one another, with the suction belt being guided continuously in the transport direction of the sheets from the cross cutter to the braking device, i.e. over both suction sections and the area of the shingling device.
  • At least one suction device is provided to form a suction path, the suction device having a suction profile or a suction box.
  • a suction profile or a suction box By using a suction profile or a suction box, the generated negative pressure can be generated in a targeted and locally limited manner.
  • a continuous suction profile is provided, in particular an arrangement of several suction profiles arranged one behind the other transversely to the transport direction of the sheets, or a continuous suction box for pressure reduction and formation of the suction path between the shingling device and the braking device and for formation of the further suction path.
  • a continuous suction profile from the cross cutter to the braking device enables simple sealing and adjustment of the vacuum generation over the profile length in the transport direction of the sheets.
  • a discontinuous or non-continuous reduction in the pressure drop or a sudden pressure drop is provided over the length of the suction profile or suction box in the area of the imbricating device.
  • the negative pressure in the suction profile in the area of the overlapping device increases from a lower negative pressure in the transport direction of the sheets before the overlapping device to a less deep negative pressure after the overlapping device.
  • a single uninterrupted suction profile or a single, uninterrupted or continuous suction box can be provided, with the vacuum level in the suction profile or suction box being divided by a barrier or seal.
  • the length of the intake sections can be changed by changing the position of the barrier.
  • the barrier or seal causes a non-continuous change in pressure drop over the length of the suction profile or suction box.
  • the position of the sudden increase in pressure in the suction profile or suction box in the transport direction of the sheets can be easily changed by the movable barrier and aligned with the position of the shingling device, especially if the shingling device is designed to be adjustable depending on the sheet format.
  • the movable barrier or seal is designed to be adjustable together with the shingling device in and/or counter to the transport direction of the sheets.
  • the common adjustability can be achieved in that a common carriage is provided for the shingling device and the movable seal or barrier, with the common carriage being designed to be adjustable in and/or against the transport direction of the sheets.
  • the location of the non-constant pressure change migrates when the imbricating device is adjusted with the position of the imbricating device in or against the transport direction of the sheets. This ensures that at least at the location of the shingling device, there is always a lower pressure level than in the area between the cross cutter and the shingling device.
  • At least one telescoping suction profile and/or at least two suction profiles that mesh with one another can be provided to form a length-variable suction path between the shingling device and the braking device.
  • Telescoping and/or intermeshing suction profiles represent simple mechanical configurations of length-changeable suction devices.
  • telescoping means that several complementary suction profiles can be pushed into one another and the length of the entire suction profile can thus be changed. It must be ensured here that the two complementary, intermeshing suction profiles are tightly connected to one another, for example with the aid of a dynamic seal, so that a substantially identical pressure profile can be achieved over the length of the suction profile.
  • the suction section can also be formed from suction profiles arranged in alternation, with a first suction profile starting in the transport direction from the shingling device and a second suction profile against the transport direction from the braking device, and the two suction profiles overlap at least in sections transversely to the transport direction.
  • the two suction profiles can be displaced in such a way that they mesh with one another until the front edge of one suction profile reaches the rear edge of the other suction profile and vice versa. Then the maximum length of the intake section is reached.
  • Both of the above-mentioned options for forming a length-variable intake path between the shingle device and the braking device also permit an adjustable arrangement of the braking device relative to the shingle device. If the braking device is to be adjusted in and/or against the transport direction of the sheets, for example in order to adapt the device to a changed sheet format, the suction path between the shingling device and the braking device can be easily adapted to the changed length between the shingling device and the braking device.
  • a device 1 known from the prior art for forming a sheet stream 2 from underlapping sheets 3 made of paper, film or cardboard is shown schematically.
  • the device 1 has a feed device, not shown, which promotes a quasi-endless strip of paper or cardboard 4 .
  • the tape is with an unwinding device, not shown, from a paper or Cardboard roll provided on a feed side and can be passed through an intermediate paper store.
  • a cross-cutting device 5 downstream of the feed device (not shown) in the transport direction X of the sheets 3 cuts the strip 4 into sheets 3 of a defined length.
  • the transverse cutting device 5 is designed in the form of a rotatably mounted shaft 6 which has a cutting edge 7 on its circumference. If the cutting edge 7 arranged on the shaft 6 and a fixed cutting edge 8 are engaged, the strip 4 is cut.
  • the sheet length can be adjusted by changing the rotational speed of the shaft 6 and the feed speed.
  • the sheets 3 are transported further in the transport direction X on a conveyor belt with at least one fast-moving conveyor belt 9 .
  • a belt section with a plurality of conveyor belts 9 is preferably provided, which lie one behind the other transversely to the direction of transport X and are spaced apart from one another. The following statements on the conveyor belt 9 refer to this belt section.
  • a shingling device 10 following the cross-cutting device 5 consists of a lifting unit 11 and a delay unit 12.
  • the delay unit 12 has at least one suction belt 13 arranged above the transport plane Y of the sheets 3.
  • the suction belt 13 is formed by a conveyor belt provided with holes, which cooperates with a suction box 14 that generates a vacuum.
  • the lifting unit 11 has a beater shaft 15 with at least one beater 16 .
  • the beater 16 of the lifting unit 11 presses a sheet 3 against the suction belt 13 with each revolution of the beater shaft 15. Since the suction belt 13 is moved at a lower speed than the fast-moving conveyor belt 9, the front edge of a trailing sheet 3 is under the raised rear edge of a leading arch 3 promoted.
  • the trailing sheet 3 With the next revolution of the beater shaft 16, the trailing sheet 3 is lifted at the rear edge, so that the sheet 3 that is further trailing can be conveyed under the trailing sheet 3. In this way, an arc stream 2 of underlapping arcs 3 is created. If the trailing edge of the leading sheet 3 is no longer in the gripping area of the suction belt 13, the leading sheet 3 is held above the transport level by the trailing sheet 3, since the trailing sheet 3 is already being held up by the suction belt 13 before the leading sheet 3 leaves the gripping area of the suction belt 13 leaves.
  • the braking device 17 has at least one nip roller 18 which, together with at least one slowly running conveyor belt 19, forms a braking gap.
  • the distance between the braking device 17 and the shingling device 10 is set in such a way that the front edge of a sheet 3 preferably just enters the braking gap and is decelerated when the rear sheet area, in particular the rear edge of the sheet 3, has passed from the beater 16 of the lifting unit 11 the suction belt 13 is pressed.
  • the sheet 3 is braked or decelerated preferably approximately at the same time by the nip roller 18 and the slowly running conveyor belt 19 in the front area and by the suction belt 13 in the rear sheet area.
  • the suction belt 13 has a slightly reduced speed compared to the slow-running conveyor belt 19.
  • sheet stream 2 is conveyed at the same speed and, in particular, with substantially the same stream length, i.e. at the same distance from the leading edge of leading sheet 3 to the leading edge of trailing sheet 3, on a transfer table (not shown) to a transfer point (not shown). further processed machine transported.
  • a suction box 20 can be arranged below the conveyor belt 9 in the area between the cross-cutting device 5 and the shingling device 10 .
  • the conveyor belt 9 is then preferably designed as a suction belt.
  • a negative pressure is generated in the suction box 20, as a result of which the sheets are drawn against the conveyor belt 9.
  • the sheet 3 or the material web 4 is transported on the conveyor belt 9 before, during and after cutting in the cross cutting device 5 .
  • the braking device 17 is designed to be adjustable in and/or counter to the transport direction X of the sheets 3. This is represented by the double arrow 21. If the device 1 is converted to a different sheet format, the braking device 17 is adjusted in such a way that the distance between the braking device 17 and the shingling device 10 essentially corresponds to the sheet length of the new sheet format. The distance between the braking device 17 and the shingling device 10 should be adjusted in such a way that the sheet 3 is braked essentially simultaneously at its front edge by the braking device 17 and at its rear edge by the suction belt 13 of the shingling device 10.
  • the shingling device 10 can then be moved, offset or shifted relative to the braking device 17 in or against the transport direction of the sheets 3, so that for each adjustable sheet length a leading sheet 3 is removed from the braking device at about the same time 17 and is braked at the rear by the scale device 10.
  • the distance between the transfer point and the braking device 17 or the transfer length constant during a format change, with the braking device 17 preferably not being adjusted during a format change.
  • the distance between the braking device 17, which is preferably arranged in a stationary manner, and the shingling device 10 is adapted to the actual sheet length by adjusting the shingling device 10.
  • the distance between the front transfer point of the sheets 3 to a sheet processing machine and the braking device 17 or the transfer length for different formats or cutting lengths remains the same, which leads to a considerable simplification when setting the device to a different sheet format.
  • the transfer length remains the same, there is no need to change the overlapping length of the sheets 3 in the scale flow when there is a format change.
  • the leading edge of the sheet can come into frictional contact with the leading sheet 3 when it is detached from the fast-moving conveyor belt 9 or slips.
  • the sheet 3 can also be decelerated, so that the desired shingle length is also not reached.
  • FIG. 2 another device 1 for forming an imbricated stream 2 of overlapping sheets 3 is shown schematically in a side view. Identical or matching functional units, assemblies, components and other matching features in the Figures 1 and 2 shown device 1 are provided with the same reference numbers.
  • the formation of an imbricated stream 2 of overlapping sheets 3 of paper, foil or cardboard takes place in the in 2 shown embodiment corresponding to the above-described imbricated stream formation in the device 1 1 .
  • Deviating from the in 1 Device 1 shown is in accordance with the embodiment 2 provided that the shingle device 10 is designed to be adjustable in and/or counter to the transport direction X depending on the sheet length or the sheet format. this is in 2 shown schematically by the double arrow 21.
  • the braking device 17, on the other hand, is non-adjustable in and/or opposite to the transport direction X of the sheets 3. In other words, this means that when the cutting length of the sheets 3 changes or when the sheet format changes, the shingling device 10 is offset, shifted or moved relative to the braking device 17 in such a way that a leading sheet is produced for each sheet length that is set 3 is braked approximately simultaneously at the front by the braking device 17 and at the rear by the delay unit 12 of the shingle device 10 .
  • the stacking device 10 can be adjusted overall in or counter to the transport direction X of the sheet flow 2, i.e. the lifting unit 11 and the delay unit 12 are moved together, which for this purpose are in and/or counter to the transport direction X of the sheets 3 movable chassis or frame or carrier can be included or mounted. In principle, however, it is also possible that if the suction belt 13 extends sufficiently in the transport direction X, only the beater shaft 15 with the beater 16 is adjusted in or against the transport direction X.
  • a suction profile 22 is provided between the shingling device 10 and the braking device 17 below the high-speed conveyor belt 9, which profile is designed as a hollow profile and is connected to a suction device (not shown), such as a suction fan.
  • a suction device such as a suction fan.
  • each conveyor belt 9 is preferably assigned a suction profile 22 .
  • a first suction section 24 is formed between the shingling device 10 and the braking device 17, and a further suction section 25 is formed in the area between the shingling device 10 and the cross-cutting device 5.
  • a negative pressure acts on the sheets 3 at least in the area of the leading edge of the sheets 3 via the suction profile 22 and the conveyor belt 9. The applied negative pressure prevents the leading edge of a sheet 3 from becoming detached.
  • the formation of the suction section 24 means that the following sheet 3 is transported further in a defined position after it has passed the shingling device 10 . It is thus possible for the arches 3 to overlap in a defined manner without the arches 3 interfering with one another.
  • the suction profile 22 preferably extends over the entire length of the area between the cross-cutting device 5 and the braking device 17. In the area in front of the shingling device 10, the further suction section 25 is formed by the suction profile 22.
  • the negative pressure applied to the suction profile 22 should be significantly less strong in the area of the suction section 24 following the shingling device 10 in the transport direction X than the negative pressure present in the area of the further suction section 25 between the cross-cutting device 5 and the shingling device 10.
  • a section 23 is provided on which no negative pressure or a comparatively less strong negative pressure is present. In this way, the sheet 3 can be lifted in the area 23 and pressed against the suction belt 13 in a simple manner.
  • the lifting unit 11 therefore does not have to counteract a negative pressure that would hold the trailing edge of the sheet 3 on the fast-moving conveyor belt 9 . It is thus possible for the trailing sheet 3 to be transported in the correct location and position under the leading sheet 3 that has been folded up, while at the same time the trailing edge of the sheet can be pressed against the suction belt 13 by the beater 16 without being adversely affected.
  • the suction profile 22 can preferably be formed by a continuous hollow profile.
  • the different levels of vacuum in the area of the suction section 24 and the suction section 25 can be achieved by a barrier or seal in the area of the scale device 10 .
  • a low negative pressure is generated in the intake path 24 via the barrier.
  • the pressure reduction in the area of the intake section 24 compared to the ambient pressure is preferably significantly lower than the pressure reduction in the area of the intake section 25.
  • the barrier in the profile that forms the suction sections 24, 25 is designed to be movable, in particular displaceable, in and/or counter to the transport direction X of the sheets 3.
  • the length of the intake section 24 can be adapted to the sheet format in a simple manner by adjusting the lock.
  • the length of the suction section 25 is also changed, so that the sheets 3 are transported in a defined position and in the correct position from the cross-cutting device 5 to the shingling device 10 .
  • the movable barrier is designed to be adjustable together with the lifting unit 11 and/or the entire shingling device 10 in and/or counter to the transport direction X of the sheets 3.
  • a carriage (not shown), a scaffolding or a frame can be provided in which the shingling device 10 and the movable barrier are arranged, the carriage being able to be moved in and/or counter to the transport direction X of the sheets 3 .
  • the device 1 can easily be set to a new or changed sheet format.
  • suction belt 13 of the shingling device 10 extends over a sufficiently long distance in the transport direction X of the sheets, it can also be provided that only the lifting unit 11 and the movable lock are adjusted together in and/or counter to the transport direction X of the sheets 3.
  • FIG. 3 another device 1 for forming an imbricated stream 2 of overlapping sheets 3 is shown schematically in a side view. Identical or matching functional units, assemblies, components and other matching features in the Figures 1, 2 and 3 Device 1 shown are provided with the same reference numerals.
  • the formation of an imbricated stream 2 of overlapping sheets 3 of paper, foil or cardboard takes place in the in 3 shown embodiment corresponding to the above-described imbricated stream formation in the device 1 1 .
  • Deviating from the device 1 from 2 is the braking device 17 in and/or counter to the transport direction X of the sheets 3 according to the double arrow 21 designed to be displaceable or adjustable in order to be able to adapt the device 1 to a changed sheet format.
  • the scale device 10 is in 3 shown device 1 fixed in position and thus not in and / or opposite to the transport direction X of the sheets 3 adjustable.
  • the intake section 24 is in accordance with 3 formed by at least one telescoping suction profile, which consists of telescoping suction profile sections 26 and 27 and is connected to a suction device.
  • the suction profile section 27 is preferably arranged in a stationary manner and the suction profile section 26 is preferably designed to be displaceable in and/or counter to the transport direction X of the sheets 3 .
  • the length of the intake section 24 can also be adapted to the sheet format.
  • a further device 1 for forming an imbricated stream 2 of overlapping sheets 3 is shown schematically in a side view.
  • Identical or matching functional units, assemblies, components and other matching features in the Figures 1, 2 , 3 and 4 Device 1 shown are provided with the same reference numerals.
  • the formation of an imbricated stream 2 of overlapping sheets 3 of paper, foil or cardboard takes place in the in 2 shown embodiment corresponding to the above-described imbricated stream formation in the device 1 1 .
  • the suction section 24 is formed from at least 2 intermeshing suction profiles 28 and 29, which can overlap at least in sections transversely to the transport direction X of the sheets 3.
  • the suction profiles 28, 29 are in turn connected to at least one suction device. Crosswise to the direction of transport X of the sheets 3, the combing suction profiles 28, 29 can be formed in an alternating manner.
  • the suction profile 29 is level with the front edge of the suction profile 28, the maximum length of the suction section 24 has been reached. If the suction profiles 28, 29 are pushed into one another so as to mesh, for example the suction profile 28 counter to the transport direction X of the sheets, the length of the suction section 24 is reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Description

Die Erfindung betrifft eine Vorrichtung, insbesondere einen so genannten Rollenquerschneider, zur Bildung eines Schuppenstroms von unterlappenden Bögen, insbesondere von Papier- oder Kartonbögen, mit einer Transporteinrichtung zum Transport von Bögen, mit einer Schuppeinrichtung zur bereichsweisen Unterlappung der Bögen, mit einer in Transportrichtung der Bögen der Schuppeinrichtung nachfolgend Bremseinrichtung zum Abbremsen von geschuppten Bögen, insbesondere durch Ausbildung eines Bremsspaltes für den Durchlauf von geschuppt zusammengeführten Bögen, und mit einer der Schuppeinrichtung vorgelagerten Querschneideeinrichtung zum Schneiden eines Materialbandes in einzelne Bögen. Darüber hinaus betrifft die Erfindung ein Verfahren zur Bildung eines Schuppenstroms von unterlappendenThe invention relates to a device, in particular what is known as a roll cross cutter, for forming an imbricated stream of overlapping sheets, in particular paper or cardboard sheets, with a transport device for transporting sheets, with an imbricating device for overlapping the sheets in certain areas, with a flow in the transport direction of the sheets The shingling device is followed by a braking device for braking shingled sheets, in particular by forming a braking gap for the passage of sheets brought together in a shingled manner, and with a transverse cutting device upstream of the shingling device for cutting a strip of material into individual sheets. In addition, the invention relates to a method for forming an imbricated stream of underlapping

Bögen, insbesondere von Folien, Papier- oder Kartonbögen, weiter insbesondere zur Bildung eines Schuppenstroms von mit einem Querschneider aus einem Materialband geschnittenen einzelnen Bögen, wobei vereinzelte Bögen zu einer Schuppeinrichtung transportiert und bereichsweise unterlappt werden, um einen Schuppenstrom zu erzeugen, und wobei die geschuppten Bögen mit einer in Transportrichtung der Bögen der Schuppeinrichtung nachfolgenden Bremseinrichtung abgebremst werden.Sheets, in particular of foils, sheets of paper or cardboard, in particular for the formation of an imbricated stream of individual sheets cut from a strip of material using a cross cutter, with individual sheets being transported to a shingling device and overlapped in some areas in order to produce a shingled stream, and with the shingled Sheets are braked with a braking device that follows in the transport direction of the sheets of the shingling device.

Ein Rollenquerschneider ist beispielsweise aus der DE 101 03 040 A1 bekannt. Mit dem bekannten Rollenquerschneider können Papier- oder Kartonbögen als quasi endloses Band in Form einer Papierrolle bereitgestellt werden. Mithilfe einer Zuführeinrichtung mit Rollen oder Walzen wird das Band einer Querschneideeinrichtung zugeführt und dort in Bögen mit definierter Länge geschnitten. Häufig ist der Zuführeinrichtung ein Papierspeicher vorgeschaltet, um eine bestimmte Bahnlänge des Papiers vorzuhalten. Die geschnittenen Bögen werden mithilfe von schnell laufenden Transportbändern einer Schuppeinrichtung zur Bildung einer Unterlappung der Bögen zugeführt. Die Schuppeinrichtung beinhaltet eine Anhebewelle und ein darüber angeordnetes Saugband. Die durch die Schuppeinrichtung laufenden Bögen werden an einer definierten Stelle der Bögen, insbesondere bezogen auf die Hinterkante der Bögen von der Anhebewelle gegenüber der Transportebene angehoben und an das darüber angeordnete Saugband gedrückt. Das Saugband weist eine geringere Umlaufgeschwindigkeit als die schnell laufenden Transportbänder auf, die die Bögen von der Querschneideeinrichtung weiter transportieren. Der Bogen wird somit abgebremst, wenn die Hinterkante des Bogens von der Anhebeweldas darüber angeordnete Saugband gedrückt und von diesem gehalten wird. Die Schuppeinrichtung wirkt hierbei als erste, hintere Bremseinheit.A roll sheeter is, for example, from DE 101 03 040 A1 known. With the known roll cross cutter, sheets of paper or cardboard can be provided as a quasi-endless band in the form of a paper roll. With the aid of a feed device with rollers or rollers, the strip is fed to a cross-cutting device, where it is cut into sheets of a defined length. A paper reservoir is often connected upstream of the feed device in order to keep available a certain web length of the paper. The cut sheets are fed to a shingling device with the help of high-speed conveyor belts to form an underlap of the sheets. The shingling device includes a lifting shaft and a suction belt arranged above it. The sheets running through the shingling device are lifted at a defined point on the sheets, in particular in relation to the trailing edge of the sheets, by the lifting shaft in relation to the transport plane and are pressed onto the suction belt arranged above. The suction belt has a lower peripheral speed than the high-speed conveyor belts that transport the sheets from the cross-cutting device. The bow is thus decelerated when the trailing edge of the bow is lifted by the lifting beam is pressed and held by the suction belt arranged above it. The scale device acts as the first, rear brake unit.

Der Schuppeinrichtung ist in Transportrichtung des Schuppenstroms eine Bremseinrichtung als zweite, vordere Bremseinheit nachgeordnet. Eine solche Bremseinrichtung ist beispielsweise in der DE 38 12 685 A1 beschrieben. Die Bremseinrichtung kann wenigstens eine so genannte Nipprolle aufweisen, die zusammen mit einem Transportband, einer weiteren Rolle oder einer Walze einen Bremsspalt bildet. Der Abstand zwischen der Bremseinrichtung und der Schuppeinrichtung ist so eingestellt, dass die Bogenvorderkante eines Bogens vorzugsweise gerade in den Bremsspalt der Bremseinrichtung einläuft und verzögert wird, wenn der hintere Bogenbereich, insbesondere die Hinterkante des Bogens, von der Anhebewelle der Schuppeinrichtung an das Saugband gedrückt wird. Der Bogen wird auf diese Weise vorzugsweise zeitgleich von der Nipprolle im vorderen Bogenbereich und von dem Saugband der Schuppeinrichtung im hinteren Bogenbereich abgebremst bzw. verzögert. Durch das gleichzeitige Abbremsen des Bogens im Bereich seiner Vorder- und Hinterkante wird eine Wellenbildung des Bogens beim Abbremsen verhindert. Der nachlaufende Bogen weist eine höhere Geschwindigkeit auf als der bereits hochgeschlagene, vorlaufende Bogen. Da der vorlaufende Bogen mit seiner Hinterkante an dem Saugband hochgehalten wird, kann die Vorderkante des nachlaufenden Bogens unter den vorlaufenden Bogen gefördert werden. Somit kommt es aufgrund der Geschwindigkeitsdifferenz zwischen dem vor- und nachlaufenden Bogen zu einer Unterlappung der Bögen. Auf diese Weise wird ein kontinuierlicher Schuppenstrom erzeugt. Im Anschluss an die Bremseinrichtung wird der durch die unterlappten Bögen gebildete Schuppenstrom mit gleicher Geschwindigkeit und gleicher Schuppenlänge der unterlappten Bögen auf einen Übergabetisch mit langsam laufenden Transportbändern zu einer weiterverarbeitenden Maschine weitertransportiert.A braking device is arranged downstream of the shingling device in the transport direction of the shingled stream as a second, front braking unit. Such a braking device is, for example, in DE 38 12 685 A1 described. The braking device can have at least one so-called nip roller, which forms a braking gap together with a conveyor belt, another roller or a roller. The distance between the braking device and the stacking device is set in such a way that the leading sheet edge of a sheet preferably just enters the braking gap of the braking device and is decelerated when the rear sheet area, in particular the trailing edge of the sheet, is pressed onto the suction belt by the lifting shaft of the stacking device . In this way, the sheet is braked or decelerated preferably simultaneously by the nip roller in the front sheet area and by the suction belt of the shingling device in the rear sheet area. The simultaneous deceleration of the sheet in the area of its leading and trailing edge prevents the sheet from rippling during braking. The trailing sheet has a higher speed than the leading sheet that has already been turned up. Since the leading sheet is held up with its trailing edge on the suction belt, the leading edge of the trailing sheet can be conveyed under the leading sheet. Thus, due to the difference in speed between the leading and trailing sheets, the sheets will overlap. In this way, a continuous imbricated stream is generated. Following the braking device, the shingled stream formed by the underlapped sheets is transported at the same speed and with the same shingle length of the underlapped sheets onto a transfer table with slow-running conveyor belts to a further processing machine.

Die Bögen werden, wie im vorangehenden Absatz beschrieben, etwa zeitgleich an ihrer Vorder- und Hinterkante abgebremst. Insbesondere bei langen Bogenformaten kann es zum Durchhängen der Bögen kommen, wobei ein durchhängender vorlaufender Bogen einen nachfolgenden Bogen in seiner Vorwärtsbewegung behindern kann. Dies kann zu Problemen bei der Positioniergenauigkeit der nachlaufenden Bögen am Bremsspalt führen. Um ein Durchhängen der Bögen zu verhindern, werden die Bögen bei der oben beschrieben Unterlappung nach dem Hochdrücken durch die Schlägerwelle vom Saugband angezogen, gehalten und darüber gestrafft bzw. gespannt.As described in the previous paragraph, the sheets are braked at approximately the same time at their leading and trailing edges. Particularly in the case of long sheet formats, the sheets can sag, with a sagging leading sheet being able to impede the forward movement of a following sheet. This can lead to problems with the positioning accuracy of the following sheets at the braking nip. In order to prevent the arches from sagging, the arches are pulled up by the suction belt after being pushed up by the beater shaft, held and then tightened or tensioned.

Ein Spannen der Bögen wird dadurch realisiert, dass die Geschwindigkeit des Saugbandes etwas geringer als die Geschwindigkeit der Nipprollen der Bremseinrichtung eingestellt wird. Aufgrund der Zugkräfte, die durch die Geschwindigkeitsdifferenz zwischen den Nipprollen und dem Saugband auf den Bogen ausgeübt werden, wird der Bogen gespannt und das Durchhängen verringert. Wird der vorlaufende Bogen aus dem Eingriffsbereich des Saugbandes gefördert, wird dieser nicht mehr vom Saugband gehalten. Ein herunterfallender Bogen würde die Vorderkante des nachlaufenden Bogens derart behindern, dass eine lage- bzw. positionsdefinierte Unterschuppung nicht mehr möglich wäre. Aufgrund der höheren Reibung, verursacht durch das Eigengewicht des vorlaufenden Bogens, würde der schneller laufende nachfolgende Bogen in seiner Vorwärtsbewegung behindert werden. Aus diesem Grund verbleibt ein mit seiner Hinterkante hochgeschlagene Bogen länger als einen Takt im Wirkbereich des Saugbandes. Ein Takt bezeichnet die Zeitdauer zwischen dem Hochschlagen eines ersten vorlaufenden Bogens und dem Hochschlagen eines zweiten nachlaufenden Bogens. Somit ist sichergestellt, dass der vorlaufende Bogen, wenn er den Einflussbereich des Saugbandes verlässt, von einem nachlaufenden, hochgeschlagenen und bereits angesaugten Bogen weiter hochgehalten wird, da sich die Hinterkante des nachlaufenden Bogens dann bereits im Wirkbereich des Saugbandes befindet und der nachlaufende Bogen den vorlaufenden Bogen hochhält. Das Saugband muss demnach eine ausreichend hohe Saugleistung aufbringen, um sowohl die hochgeschlagenen Bögen als auch die von den hochgeschlagenen Bögen gehalten Bogen sicher halten zu können.The sheets are tensioned by setting the speed of the suction belt slightly lower than the speed of the nip rollers of the braking device. Due to the tensile forces exerted on the sheet by the difference in speed between the nip rollers and the suction belt, the sheet is tensioned and sagging is reduced. If the leading sheet is conveyed out of the engagement area of the suction belt, it is no longer held by the suction belt. A falling sheet would impede the front edge of the trailing sheet in such a way that it would no longer be possible to shingle under in a defined position. Due to the higher friction caused by the dead weight of the leading sheet, the faster running following sheet would be hindered in its forward movement. For this reason, a sheet folded up with its trailing edge remains longer than one cycle in the effective range of the suction belt. A cycle is the length of time between the beating up of a first leading sheet and the beating up of a second trailing sheet. This ensures that the leading sheet, when it leaves the area of influence of the suction belt, is held up by a trailing sheet that has been turned up and already sucked in, since the trailing edge of the trailing sheet is then already in the effective area of the suction belt and the trailing sheet the leading one holding up bow. Accordingly, the suction belt must apply a sufficiently high suction capacity in order to be able to securely hold both the folded sheets and the sheets held by the folded sheets.

Mit zunehmender Bogenlänge steigt das Gewicht des vorlaufenden Bogens, welches von dem nachlaufenden Bogen getragen werden muss. Somit steigt bei großen Bogenformaten die Gefahr des Durchhängens der Bögen. Des Weiteren ist es trotz der Geschwindigkeitsdifferenz zwischen den langsam laufenden Transportbändern und dem bogenhinterkantenführenden Saugband der Schuppeinrichtung nicht möglich, ein Durchhängen der Bögen vollständig zu verhindern. Aus diesem Grund kommt es insbesondere bei langen Bogenformaten zu einem stärkeren Durchhängen der vorlaufenden Bögen, wodurch eine Bremswirkung auf die Vorderkante des nachfolgenden Bogens durch Reibkontakt erzeugt werden kann. Dies wirkt sich negativ auf die Positionierung und Lage des nachlaufenden Bogens aus. Ein verrutschter bzw. nicht optimal liegender Bogen im Schuppenstrom kann zu Positionsfehlern bis hin zur Beschädigung des Bogens, aber auch zu einem Stillstand der gesamten Vorrichtung führen.With increasing sheet length, the weight of the leading sheet increases, which has to be carried by the trailing sheet. This increases the risk of the sheets sagging with large sheet formats. Furthermore, despite the difference in speed between the slow-running conveyor belts and the suction belt of the shingling device that guides the trailing edge of the sheet, it is not possible to completely prevent the sheets from sagging. For this reason, there is a greater sagging of the leading sheets, especially with long sheet formats, as a result of which a braking effect on the leading edge of the following sheet can be generated by frictional contact. This has a negative effect on the positioning and location of the trailing sheet. A sheet that has slipped or is not positioned optimally in the shingled stream can lead to position errors and damage to the sheet, but also to a standstill of the entire device.

Aus der EP 0 503 531 A1 bzw. DE 91 03 137 U1 ist eine Vorrichtung zur Bildung von sich unterschuppenden Bögen bekannt. Zur Erzeugung einer Unterlappung der Bögen können die Transportbänder, die als Schleppeinrichtung ausgebildet sind, mit variabler Geschwindigkeit verfahren werden, Die Saugbänder sind dabei partiell mit Sauglöchern versehen, so dass ein Bogen in Transportrichtung im vorderen Bereich angesaugt wird.From the EP 0 503 531 A1 or. DE 91 03 137 U1 there is known an apparatus for forming shingled sheets. To create an underlap of the sheets, the conveyor belts, which are designed as a drag device, can be moved at variable speeds. The suction belts are partially provided with suction holes, so that a sheet is sucked in the front area in the transport direction.

Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung und ein Verfahren jeweils der eingangs genannten Art zur Verfügung zustellen, die einen exakten bzw. definierten Zulauf eines nachlaufenden Bogens im Bogenstrom in die Bremseinrichtung ermöglichen. Darüber hinaus sollen auch bei hohen Transportgeschwindigkeiten Beschädigungen durch ein nicht exaktes Einlaufen der Bögen in die Bremseinrichtung sicher vermieden werden.The object of the present invention is to provide a device and a method of the type mentioned at the outset, which enable a precise or defined feed of a trailing sheet in the sheet flow into the braking device. In addition, even at high transport speeds, damage caused by the sheets entering the braking device in an inaccurate manner should be reliably avoided.

Die vorgenannte Aufgabe wird bei einer Vorrichtung der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass im Bereich zwischen der Schuppeinrichtung und der Bremseinrichtung eine vorzugsweise unterhalb der Transportebene der Bögen ausgebildete Ansaugstrecke zum Weitertransport der Bogenvorderkante eines im Schuppenstrom nachlaufenden Bogens in die Bremseinrichtung vorgesehen ist. Bei dem erfindungsgemäßen Verfahren ist dementsprechend vorgesehen, dass die nachlaufenden Bögen eines Schuppenstroms unter der Wirkung einer Ansaugung vorzugsweise von unten in die Bremseinrichtung transportiert werden.In a device of the type mentioned at the outset, the above-mentioned object is achieved according to the invention in that in the region between the shingling device and the braking device, a suction section, preferably below the transport plane of the sheets, is provided for further transport of the sheet leading edge of a sheet following in the shingled stream into the braking device. Accordingly, in the method according to the invention, it is provided that the following sheets of an imbricated flow are transported into the braking device preferably from below under the effect of suction.

Der Erfindung liegt der Grundgedanke zugrunde, die Vorderkannten der nachfolgenden Bögen mittels einer Ansaugung im Bereich zwischen der Schuppeinrichtung und der Bremseinrichtung definiert der Bremseinrichtung zuzuführen. Die Bogenvorderkante eines nachlaufenden Bogens wird hierbei zumindest abschnittsweise relativ zu einem vorlaufenden Bogen weiterbewegt, wobei die Bogenvorderkante bei einer Unterschuppung von unten angesaugt wird und sich unterhalb von einem vorlaufenden Bogen befindet. Die Positionsgenauigkeit der Vorderkante und damit des gesamten Bogens wird hierdurch deutlich erhöht. Mithilfe der Erfindung kann auch eine Beschädigung des Bogens im Bremspunkt verhindert werden, die durch Positionsungenauigkeiten der Vorderkante entstehen können.The invention is based on the basic idea of feeding the front edges of the following sheets to the braking device in a defined manner by means of suction in the region between the shingling device and the braking device. The leading edge of a trailing sheet is in this case at least partially moved further relative to a leading sheet, the leading edge of the sheet being sucked in from below in the event of shingling and being located below a leading sheet. This significantly increases the positioning accuracy of the leading edge and thus of the entire sheet. The invention can also be used to prevent damage to the sheet at the braking point, which can result from inaccuracies in the position of the leading edge.

Die Ansaugstrecke wird beispielsweise bei der Unterschuppung durch Erzeugung eines Unterdrucks unterhalb der Transportebene der Bögen ausgebildet.The suction path is formed, for example, in the case of shingling, by generating a negative pressure below the transport level of the sheets.

Zur Ausbildung einer Ansaugstrecke ist wenigstens eine Ansaugeinrichtung vorgesehen. Beispielsweise kann die Ansaugeinrichtung mit wenigstens einem Saugband zusammenwirken, das in Transportrichtung bewegt wird und zum Weitertransport der Bögen nach dem Passieren der Schuppeinrichtung dient. Der Unterdruck, den die Ansaugeinrichtung erzeugt, ist derart ausgebildet, dass wenigstens die Vorderkante bzw. ein Bereich der Vorderkante eines Bogens derart festgehalten wird, dass der Bogen in einer gewünschten Lage positionsgenau transportiert wird.At least one suction device is provided to form a suction path. For example, the suction device can interact with at least one suction belt, which is moved in the transport direction and is used to transport the sheets further after they have passed the shingling device. the negative pressure generated by the suction device is designed in such a way that at least the leading edge or a region of the leading edge of a sheet is held in place in such a way that the sheet is transported in a desired position with precise positioning.

Vorzugsweise wird die Ansaugstrecke durch eine Mehrzahl von Saugbändern gebildet, die quer zur Transportrichtung hintereinander angeordnet sind und parallel zueinander verlaufen. über die Saugbänder werden die Bögen angesaugt und transportiert. Jedem der Saugbänder kann dabei eine eigene Ansaugeinrichtung zugeordnet sein. Es ist jedoch auch möglich, dass lediglich eine einzige Ansaugeinrichtung, beispielsweise ein Saugkasten, vorgesehen ist, über die eine Unterdruckerzeugung für alle Saugbänder erfolgt. Alternativ ist es auch möglich, dass die Ansaugstrecke durch mehrere Transportbänder gebildet wird, die quer zur Transportrichtung hintereinander angeordnet sind und parallel zueinander verlaufen, wobei über die Transportbänder dann kein Unterdruck erzeugt wird. Zur Unterdruckerzeugung können bei dieser Ausführungsform zwischen den Transportbändern liegende Ansaugzonen ausgebildet sein. Die Ansaugeinrichtung ist dann dazu ausgebildet, im Bereich der Ansaugzonen einen Unterdruck zu erzeugen, der auf die Bögen wirkt und diese während des Bogentransports mittels der Transportbänder gegen die Transportbänder zieht.The suction section is preferably formed by a plurality of suction belts which are arranged one behind the other transversely to the transport direction and run parallel to one another. The sheets are sucked in and transported via the suction belts. Each of the suction belts can be assigned its own suction device. However, it is also possible that only a single suction device, for example a suction box, is provided, via which negative pressure is generated for all suction belts. Alternatively, it is also possible for the suction path to be formed by a plurality of conveyor belts, which are arranged one behind the other transversely to the transport direction and run parallel to one another, with no negative pressure then being generated via the conveyor belts. In this embodiment, suction zones located between the conveyor belts can be formed to generate negative pressure. The suction device is then designed to generate a negative pressure in the area of the suction zones, which acts on the sheets and pulls them against the conveyor belts during sheet transport by means of the conveyor belts.

Ein Bogen, der mit seiner Vorderkante in den Bereich der Ansaugstrecke gelangt, wird wenigstens im Bereich der Bogenvorderkante angezogen und somit in einer definierten Lage in Transportrichtung der Bögen transportiert. Die Vorderkante des Bogens ist dabei auf wenigstens einem Saugband bzw. Transportband derart fixiert, dass ein Ablösen der Vorderkante des Bogens während des Transports nicht erfolgt. Aus diesem Grund kann die Bogenvorderkante ohne Beschädigung in einen Bremsspalt der Bremseinrichtung transportiert werden. Bei der Unterschuppung kann die Hinterkante des Bogens in der Schuppeinrichtung gleichzeitig mit dem Eintritt der Bogenvorderkante in die Bremseinrichtung von einer Schlägerwelle der Schuppeinrichtung gegen ein darüber angeordnetes Saugband der Schuppeinrichtung gedrückt werden. Die Hinterkante des Bogens wird dann vom Saugband der Schuppeinrichtung hochgehalten und gleichzeitig im Bereich der Bogenvorderkante und der Bogenhinterkante abgebremst. Der nachlaufende Bogen kann sich weiterhin auf der schnell laufenden Transporteinrichtung befinden, wobei wenigstens der Bereich seiner Vorderkante in den Bereich der Ansaugstrecke gelangt. Der nachlaufende Bogen wird dabei mit einer höheren Geschwindigkeit relativ zum vorlaufenden Bogen mit einer definierten Lage bzw. Position in Transportrichtung der Bögen unterhalb von dem vorlaufenden Bogen zur Bremseinrichtung gefördert.A sheet whose front edge reaches the area of the suction path is attracted at least in the area of the front edge of the sheet and is thus transported in a defined position in the transport direction of the sheets. The front edge of the sheet is fixed on at least one suction belt or conveyor belt in such a way that the front edge of the sheet does not become detached during transport. For this reason, the leading edge of the sheet can be transported into a braking gap of the braking device without being damaged. When shingling under, the trailing edge of the sheet in the shingling device can be pressed simultaneously with the entry of the leading edge of the sheet into the braking device by a beater shaft of the shingling device against a suction belt of the shingling device arranged above it. The trailing edge of the sheet is then held up by the suction belt of the shingling device and simultaneously decelerated in the area of the sheet leading edge and the sheet trailing edge. The trailing sheet can continue to be located on the high-speed transport device, with at least the area of its leading edge reaching the area of the suction section. The trailing sheet is at a higher speed relative to the leading sheet with a defined location or position in the transport direction of the sheets conveyed below the leading sheet to the braking device.

Ein Ablösen der Vorderkante des Bogens von der Ansaugstrecke wird somit verhindert. Der nachlaufende Bogen kann somit ohne Beeinträchtigung und ohne Kollision mit dem vorlaufenden Bogen unterhalb von dem vorlaufenden Bogen zur Bremseinrichtung gefördert werden. Auf diese Weise wird eine Unterschuppung des Bogenstroms erreicht.This prevents the front edge of the sheet from detaching from the intake section. The following sheet can thus be conveyed to the braking device below the preceding sheet without being impaired and without colliding with the preceding sheet. In this way, the arc current is shingled under.

Zwischen dem Querschneider und der Schuppeinrichtung ist eine weitere Ansaugstrecke vorgesehen. Die Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung und die weitere Ansaugstrecke können mit derselben Ansaugeinrichtung ausgebildet werden oder mit mehreren separaten Ansaugeinrichtungen. Die weitere Ansaugstrecke dient dazu, die Bögen in einer gewünschten Position und Lage auf definierte Weise vom Querschneider zur Schuppeinrichtung zu transportieren. Hierdurch wird eine hohe Positionsgenauigkeit der Bögen erreicht, die notwendig ist, da sowohl der Querschneider als auch die Schuppeinrichtung im gleichen Takt wie die weiterverarbeitenden Maschine arbeiten müssen. Aufgrund dieser Taktung ist es wichtig, dass die Bogenvorderkante zu jedem Zeitpunkt eine zu dem Zeitpunkt definierte Lage bzw. eine definierte Position einnimmt. Die Positionsgenauigkeit bezieht sich selbstverständlich auf den gesamten Bogen.Another suction section is provided between the cross cutter and the shingling device. The suction section between the shingle device and the braking device and the further suction section can be formed with the same suction device or with several separate suction devices. The additional suction section is used to transport the sheets in a desired position and location in a defined manner from the cross cutter to the shingle device. This achieves a high level of positioning accuracy for the sheets, which is necessary since both the cross cutter and the shingling device have to work in the same cycle as the further processing machine. Because of this clocking, it is important that the leading edge of the sheet assumes a position or position that is defined at that point in time. Of course, the positional accuracy refers to the entire arc.

Des Weiteren kann vorgesehen sein, dass die Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung und die weitere Ansaugstrecke im Bereich der Schuppeinrichtung unterbrochen sind. Zwischen der Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung und der weiteren Ansaugstrecke liegt dann in der Transportebene der Bögen ein Bereich vor, in dem kein Unterdruck oder ein deutlich geringerer Unterdruck erzeugt wird. Dies ist insbesondere von Vorteil, wenn ein Hochschlagen der Bogenhinterkante mittels Schlägerwelle erfolgt. Auf diese Weise wird das Hochschlagen der Hinterkante eines Bogens erleichtert, da auf die Hinterkante des Bogens beim Hochschlagen keine oder eine deutlich verringerte Saugkraft wirkt. Die Ansaugstrecke ist dabei derart ausgebildet, dass der Bogen wenigstens im Bereich der Vorderkante angesaugt wird und lagedefiniert in Transportrichtung gefördert wird, während und nachdem die Bogenhinterkante von der Schlägerwelle erfasst und an das darüber liegende Saugband der Schuppeinrichtung gedrückt wird. Da im Bereich der Schlägerwelle der Schuppeinrichtung keine oder deutlich verringerte Saugkraft auf den Bogen wirkt, werden die Belastungen, die ein Bogen beim Hochschlagen erfährt, reduziert. Eine hohe Saugwirkung auf die Hinterkante eines Bogens beim Hochschlagen könnte dazu führen, dass der Bogen beim Hochschlagen beschädigt wird oder aus seiner definierten Lage verrutscht.Furthermore, it can be provided that the suction path between the shingled device and the braking device and the further suction path in the region of the shingled device are interrupted. Between the suction section between the shingling device and the braking device and the further suction section there is then an area in the transport plane of the sheets in which no negative pressure or a significantly lower negative pressure is generated. This is particularly advantageous if the rear edge of the sheet is turned up by means of a beater shaft. This makes it easier to turn up the trailing edge of a sheet, since no or a significantly reduced suction force acts on the trailing edge of the sheet when it is turned up. The suction section is designed in such a way that the sheet is sucked in at least in the area of the leading edge and is conveyed in a defined position in the transport direction while and after the sheet trailing edge is gripped by the beater shaft and pressed against the suction belt of the stacking device above it. Because in the area of Racquet shaft of the shingling device has no or significantly reduced suction force on the sheet, the stresses that a sheet experiences when it is turned up are reduced. A strong suction effect on the trailing edge of a sheet when it is folded up could result in the sheet being damaged when it is folded up or slipping out of its defined position.

Das Druckniveau im Bereich der Ansaugstrecke zwischen der Schuppeinrichtung der Bremseinrichtung ist weniger stark abgesenkt als im Bereich der weiteren Ansaugstrecke zwischen Querschneider und Schuppeinrichtung. Weniger stark bedeutet in diesem Zusammenhang, dass die Druckdifferenz zwischen dem an der Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung erzeugten Unterdruck und dem Umgebungsdruck weniger stark ausgebildet ist als im Bereich der weiteren Ansaugstrecke. Dies führt dazu, dass der Bogen im Bereich zwischen dem Querschneider und der Schuppeinrichtung mit einer hohen Kraft angezogen wird, um eine hohe Lagegenauigkeit zu erreichen. Im Bereich der Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung wird der Bogen, bzw. wenigstens die Vorderkante des Bogens, weniger stark angezogen. Die unterschiedlichen Unterdruckniveaus beidseitig der Schuppeinrichtung ermöglichen einen exakten und schnellen Bogentransport vom Querschneider bis zur Bremseinrichtung.The pressure level in the area of the suction section between the shingle device and the braking device is lowered less than in the area of the further suction section between the cross cutter and the shingle device. In this context, less strong means that the pressure difference between the negative pressure generated in the intake section between the shunting device and the braking device and the ambient pressure is less strong than in the area of the further intake section. The result of this is that the sheet is pulled with great force in the area between the cross cutter and the shingling device in order to achieve high positional accuracy. The sheet, or at least the leading edge of the sheet, is attracted less strongly in the area of the intake path between the shingling device and the braking device. The different levels of vacuum on both sides of the shingle device enable precise and rapid sheet transport from the cross cutter to the braking device.

Es kann zweckmäßig sein, wenn im Bereich der Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung eine Druckabsenkung gegenüber dem Umgebungsdruck von weniger als 2 mbar, vorzugsweise von weniger 1 mbar, weiter vorzugsweise von weniger als 0,5 mbar, besonders bevorzugt von weniger als 0,1 mbar, erfolgt. Die Druckabsenkung kann jedoch auch deutlich höher sein und es kann eine Druckabsenkung gegenüber dem Umgebungsdruck von 0,5 bis 10 mbar, vorzugsweise zwischen 1 bis 5 mbar, insbesondere bis 2 mbar, vorgesehen sein. Durch eine Druckabsenkung wird in vorteilhafter Weise erreicht, dass die Bogenvorderkante und damit der gesamte Bogen in einer definierten Lage transportiert werden kann.It can be expedient if in the area of the intake path between the shunting device and the braking device there is a pressure reduction compared to the ambient pressure of less than 2 mbar, preferably less than 1 mbar, more preferably less than 0.5 mbar, particularly preferably less than 0. 1 mbar, takes place. However, the pressure reduction can also be significantly higher and a pressure reduction compared to the ambient pressure of 0.5 to 10 mbar, preferably between 1 to 5 mbar, in particular up to 2 mbar, can be provided. By reducing the pressure, it is achieved in an advantageous manner that the leading edge of the sheet, and thus the entire sheet, can be transported in a defined position.

In weiter vorteilhafter Weise erfolgt im Bereich der weiteren Ansaugstrecke, d.h. im Bereich zwischen Querschneider und Schuppeinrichtung, eine zehnfach bis hundertfach größere Druckabsenkung als im Bereich zwischen der Schuppeinrichtung und der Bremseinrichtung. Durch den stärkeren Unterdruck werden die Bögen positionsgenau vom Querschneider zur Schuppeinrichtung transportiert.In a further advantageous manner, the pressure drop in the area of the further intake path, ie in the area between the cross cutter and the shingle device, is ten to a hundred times greater than in the area between the shingle device and the braking device. Due to the stronger negative pressure, the sheets are transported from the cross cutter to the shingling device in the exact position.

In einer vorteilhaften Ausführungsform ist die Schuppeinrichtung in und/oder entgegen der Transportrichtung der Bögen schnittlängenabhängig verstellbar ausgebildet. Dies ermöglicht ein einfaches Anpassen der Vorrichtung an ein geändertes Bogenformat. Der Begriff "schnittlängenabhängig" bezieht sich auf eine Änderung der Anordnung der Schuppeinrichtung relativ zum Querschneider und, vorzugsweise, relativ zur Bremseinrichtung, für einen Formatwechsel des Bogens. In einer weiter vorteilhaften Ausführungsform ist die Bremseinrichtung in und/oder entgegen der Transportrichtung der Bögen unverstellbar ausgebildet. Somit ist der Abstand zwischen dem Übergabepunkt und der Bremseinrichtung für jedes Bogenformat gleich, also schnittlängenunabhängig.In an advantageous embodiment, the shingling device is designed to be adjustable in and/or counter to the transport direction of the sheets, depending on the cut length. This enables the device to be easily adapted to a changed sheet format. The term "cut length-dependent" refers to a change in the arrangement of the shingling device relative to the cross cutter and, preferably, relative to the braking device, for a format change of the sheet. In a further advantageous embodiment, the braking device is designed so that it cannot be adjusted in and/or counter to the transport direction of the sheets. The distance between the transfer point and the braking device is therefore the same for every sheet format, i.e. it is independent of the cutting length.

Die Schuppeinrichtung kann dann in Abhängigkeit von der aktuellen (neuen) Bogenlänge relativ zu der Bremseinrichtung in oder entgegen der Transportrichtung der Bögen verfahren, versetzt oder verschoben werden, so dass bei jeder einstellbaren Bogenlänge ein vorlaufender Bogen ungefähr gleichzeitig vorne von der Bremseinrichtung und hinten von der Schuppeinrichtung gebremst wird. Insbesondere wird es ermöglicht, den Abstand zwischen dem Übergabepunkt und der Bremseinrichtung bzw. die Übergabelänge bei einem Formatwechsel konstant zu halten, wobei die Bremseinrichtung bei einem Formatwechsel vorzugsweise nicht verstellt wird. Stattdessen wird der Abstand zwischen der vorzugsweise ortsfest angeordneten Bremseinrichtung und der Schuppeinrichtung durch Verstellen der Schuppeinrichtung an die tatsächliche Bogenlänge angepasst. So bleibt der Abstand zwischen dem vorderen Übergabepunkt der Bögen an eine Bogenverarbeitungsmaschine und der Bremseinrichtung bzw. die Übergabelänge für unterschiedliche Formate bzw. Schnittlängen gleich, was zu einer erheblichen Vereinfachung bei der Einstellung der Vorrichtung auf ein anderes Bogenformat führt. Insbesondere entfällt bei gleichbleibender Übergabelänge die Notwendigkeit, die Überlappungslänge der Bögen im Schuppenstrom bei einem Formatwechsel zu verändern.Depending on the current (new) sheet length, the shingling device can then be moved, offset or shifted relative to the braking device in or counter to the transport direction of the sheets, so that for each adjustable sheet length, a leading sheet is removed from the braking device at the front and from the rear at about the same time Schuppeinrichtung is braked. In particular, it is possible to keep the distance between the transfer point and the braking device or the transfer length constant during a format change, with the braking device preferably not being adjusted during a format change. Instead, the distance between the braking device, which is preferably arranged in a stationary manner, and the shingling device is adapted to the actual sheet length by adjusting the shingling device. The distance between the front transfer point of the sheets to a sheet processing machine and the braking device or the transfer length for different formats or cutting lengths remains the same, which leads to a considerable simplification when setting the device to a different sheet format. In particular, if the transfer length remains the same, there is no need to change the overlapping length of the sheets in the shingled stream when there is a format change.

Darüber hinaus lässt sich ein definierter Stopppunkt der Vorrichtung definieren, der für jedes Bogenformat gleich ist. Der Schuppungsgrad bzw. die Überlapplänge kann bei einem feststehenden Abstand zwischen dem Übergabepunkt und der Bremseinrichtung für jedes Bogenformat gleichgehalten werden. Die Länge zwischen dem Übergabepunkt und der Bremseinrichtung entspricht genau einem ganzzahligen Vielfachen der Schuppungslänge. Bei einem Stopp befindet sich der vorlaufende Bogen immer im Einflussbereich des Saugbandes, wodurch es dem nachfolgenden Bogen ermöglicht wird, sich unter den vorlaufenden Bogen zu schieben. Bei einem Systemstopp kann ein nachlaufender Bogen unter den vorlaufenden Bogen weitertransportiert werden. Dadurch wird es möglich, die schnell laufenden Bänder weniger stark bzw. weniger schnell abbremsen zu müssen als die langsam laufenden Bänder, da die Überlappungslänge als Puffer für den nachlaufenden Bogen fungiert. Die Materialbeanspruchung der schnell laufenden Bänder und ihrer Bremseinheiten kann dadurch deutlich verringert werden. Da die Gefahr eines unkontrollierten Verrutschens eines Bogens durch die verringerte Abbremsung minimiert wird, muss das Abbremsen der Bögen weniger stark unterstützt werden. Hierdurch kann der Energiebedarf bei einem Systemstopp weiter reduziert werden. Beim Wiederanfahren der Vorrichtung können die langsam laufenden Bänder zeitlich kurz vor den schnell laufenden Bändern angetrieben werden, wodurch die richtige Phasenlage in der Vorrichtung wieder hergestellt wird. Phasenlage bedeutet in diesem Zusammenhang, dass die relative Position der Bögen zu der Schlägerwelle und der Position der Messer auf der Querschneideeinrichtung jederzeit eine feste Position relativ zueinander einnehmen. Ein Systemstart ist also in einfacher Weise und in kurzer Zeit möglich.In addition, a defined stopping point of the device can be defined, which is the same for every sheet format. The degree of overlapping or the overlap length can be kept the same for each sheet format with a fixed distance between the transfer point and the braking device. The length between the transfer point and the braking device corresponds exactly to an integer multiple of the shingle length. During a stop, the leading sheet is always within the suction belt's sphere of influence, allowing the following sheet to slide under the leading sheet. In the event of a system stop, a trailing sheet can fall under the leading one Arch are transported further. This makes it possible to slow down the fast-moving belts to a lesser extent or less quickly than the slow-moving belts, since the overlapping length acts as a buffer for the following sheet. The material stress on the high-speed belts and their braking units can be significantly reduced as a result. Since the risk of an uncontrolled slipping of a sheet is minimized by the reduced deceleration, the deceleration of the sheets does not have to be assisted as much. This can further reduce the energy requirement in the event of a system stop. When restarting the device, the slow-moving tapes can be driven just before the fast-moving tapes, whereby the correct phasing in the device is restored. In this context, phasing means that the relative position of the sheets to the beater shaft and the position of the knives on the cross cutting device always assume a fixed position relative to one another. A system start is therefore possible in a simple manner and in a short time.

Darüber hinaus kann ein Anhalten der Vorrichtung verhindert werden, bei der sich die Querschneideeinrichtung gerade im Schnitt befindet. Ein Anhalten der Vorrichtung, während die Querschneideeinrichtung gerade den Schnitt durchführt, kann zu einer unkontrollierten Beschädigung des Bogens und/oder der Materialbahn führen. Insofern ist ein Anhalten der Vorrichtung im Schnitt zu vermeiden. Da der nachlaufende Bogen die Schuppungslänge bzw. die Überlappungslänge als Puffer gegenüber dem vorlaufenden bereits hochgeschlagenen Bogen aufweist, können die langsam laufenden Transportbänder und die Querschneideeinrichtung derart gezielt gestoppt werden, dass ein Anhalten der Querschneideeinrichtung außerhalb des Schnittes erfolgt.In addition, the device can be prevented from being stopped when the transverse cutter is in the process of cutting. Stopping the device while the cross-cutting device is in the process of making the cut can lead to uncontrolled damage to the sheet and/or the material web. In this respect, stopping the device during the cut is to be avoided. Since the trailing sheet has the shingling length or the overlapping length as a buffer compared to the leading sheet that has already been turned up, the slow-moving conveyor belts and the cross-cutting device can be stopped in a targeted manner such that the cross-cutting device stops outside the cut.

Vorteilhafterweise weist die Transporteinrichtung wenigstens ein Saugband auf, insbesondere eine Bänderanordnung mit mehreren parallel zueinander laufenden Saugbändern, wobei das Saugband in Transportrichtung der Bögen kontinuierlich vom Querschneider bis zur Bremseinrichtung, d.h. über beide Ansaugstrecken und den Bereich der Schuppeinrichtung, geführt ist. Somit erstreckt sich lediglich ein vorzugsweise schnell laufendes Saugband bzw. lediglich eine Bänderanordnung über die beiden Ansaugstrecken und den Bereich der Schuppeinrichtung. Hierdurch wird eine leichte und einfache Steuerung erreicht. Eine Synchronisierung von in Transportrichtung nacheinander angeordneten Bänderstrecken ist somit nicht notwendig. Alternativ können aber auch voneinander getrennte Bänderstrecken vorgesehen sein, um den Bogentransport im Bereich der beiden Ansaugstrecken zu ermöglichen.Advantageously, the transport device has at least one suction belt, in particular a belt arrangement with several suction belts running parallel to one another, with the suction belt being guided continuously in the transport direction of the sheets from the cross cutter to the braking device, i.e. over both suction sections and the area of the shingling device. Thus, only one preferably fast-running suction belt or only one belt arrangement extends over the two suction sections and the area of the shingling device. This achieves easy and simple control. A synchronization of conveyor sections arranged one after the other in the direction of transport is therefore not necessary. Alternatively, however, belt stretches that are separate from one another can also be used be provided to allow sheet transport in the area of the two intake sections.

Vorteilhafterweise ist wenigstens eine Ansaugeinrichtung zur Ausbildung einer Ansaugstrecke vorgesehen, wobei die Ansaugeinrichtung ein Saugprofil oder einen Saugkasten aufweist. Durch den Einsatz eines Saugprofils bzw. eines Saugkastens kann der erzeugte Unterdruck zielgerichtet und lokal begrenzt erzeugt werden. Vorteilhafterweise ist ein durchgehendes Saugprofil, insbesondere eine Anordnung von mehreren quer zur Transportrichtung der Bögen hintereinanderliegenden Saugprofilen, oder ein durchgehender Saugkasten zur Druckabsenkung und Ausbildung der Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung und zur Ausbildung der weiteren Ansaugstrecke vorgesehen. Ein durchgehendes Saugprofil vom Querschneider bis zur Bremseinrichtung ermöglicht in einfacher Weise eine einfache Abdichtung und eine Anpassung der Unterdruckerzeugung über die Profillänge in Transportrichtung der Bögen.Advantageously, at least one suction device is provided to form a suction path, the suction device having a suction profile or a suction box. By using a suction profile or a suction box, the generated negative pressure can be generated in a targeted and locally limited manner. Advantageously, a continuous suction profile is provided, in particular an arrangement of several suction profiles arranged one behind the other transversely to the transport direction of the sheets, or a continuous suction box for pressure reduction and formation of the suction path between the shingling device and the braking device and for formation of the further suction path. A continuous suction profile from the cross cutter to the braking device enables simple sealing and adjustment of the vacuum generation over the profile length in the transport direction of the sheets.

In einer bevorzugten Ausführungsform ist über die Länge des Saugprofils oder Saugkastens im Bereich der Schuppeinrichtung eine nicht-stetige bzw. nichtkontinuierliche Verringerung der Druckabsenkung bzw. ein sprunghafter Druckabfall vorgesehen. Dies bedeutet, dass der Unterdruck im Saugprofil im Bereich der Überlappungseinrichtung von einem tieferen Unterdruck in Transportrichtung der Bögen vor der Schuppeinrichtung auf einen weniger tiefen Unterdruck nach der Schuppeinrichtung ansteigt. Zu diesem Zweck kann ein einiges unterbrechungsloses Saugprofil oder ein einziger, unterbrechungsloser bzw. durchgängiger Saugkasten vorgesehen sein, wobei das Unterdruckniveau im Saugprofil oder Saugkasten von einer Sperre bzw. Dichtung geteilt wird. Mit anderen Worten ausgedrückt lässt sich die Länge der Ansaugstrecken durch eine Veränderung der Position der Sperre verändern. Die Sperre bzw. die Dichtung verursacht eine nicht-stetige Veränderung der Druckabsenkung über die Länge des Saugprofils oder Saugkastens. Die Position der sprunghaften Druckzunahme im Saugprofil oder Saugkasten in Transportrichtung der Bögen kann durch die bewegliche Sperre in einfacher Weise verändert und insbesondere bei in Abhängigkeit vom Bogenformat verstellbar ausgebildeter Schuppeinrichtung auf die Position der Schuppeinrichtung ausgerichtet werden.In a preferred embodiment, a discontinuous or non-continuous reduction in the pressure drop or a sudden pressure drop is provided over the length of the suction profile or suction box in the area of the imbricating device. This means that the negative pressure in the suction profile in the area of the overlapping device increases from a lower negative pressure in the transport direction of the sheets before the overlapping device to a less deep negative pressure after the overlapping device. For this purpose a single uninterrupted suction profile or a single, uninterrupted or continuous suction box can be provided, with the vacuum level in the suction profile or suction box being divided by a barrier or seal. In other words, the length of the intake sections can be changed by changing the position of the barrier. The barrier or seal causes a non-continuous change in pressure drop over the length of the suction profile or suction box. The position of the sudden increase in pressure in the suction profile or suction box in the transport direction of the sheets can be easily changed by the movable barrier and aligned with the position of the shingling device, especially if the shingling device is designed to be adjustable depending on the sheet format.

In einer weiter bevorzugten Ausführungsform der Erfindung ist die bewegliche Sperre bzw. Dichtung zusammen mit der Schuppeinrichtung in und/oder entgegen der Transportrichtung der Bögen verstellbar ausgebildet. Die gemeinsame Verstellbarkeit kann dadurch erreicht werden, dass ein gemeinsamer Wagen für die Schuppeinrichtung und die bewegliche Dichtung bzw. Sperre vorgesehen ist, wobei der gemeinsame Wagen in und/oder entgegen der Transportrichtung der Bögen verstellbar ausgebildet ist. Der Ort der nicht-stetigen Druckänderung wandert bei Verstellung der Schuppeinrichtung mit der Position der Schuppeinrichtung in oder entgegen der Transportrichtung der Bögen. Damit ist sichergestellt, dass jedenfalls am Ort der Schuppeinrichtung stets ein weniger tiefes Druckniveau vorliegt als im Bereich zwischen Querschneider und Schuppeinrichtung.In a further preferred embodiment of the invention, the movable barrier or seal is designed to be adjustable together with the shingling device in and/or counter to the transport direction of the sheets. The common adjustability can be achieved in that a common carriage is provided for the shingling device and the movable seal or barrier, with the common carriage being designed to be adjustable in and/or against the transport direction of the sheets. The location of the non-constant pressure change migrates when the imbricating device is adjusted with the position of the imbricating device in or against the transport direction of the sheets. This ensures that at least at the location of the shingling device, there is always a lower pressure level than in the area between the cross cutter and the shingling device.

Alternativ kann zur Ausbildung einer längenveränderlichen Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung wenigstens ein teleskopierbares Saugprofil und/oder es können wenigstens zwei miteinander kämmende Saugprofile vorgesehen sein. Teleskopierbare und/oder kämmende Saugprofile stellen einfache mechanische Ausgestaltungen von in der Länge veränderbaren Ansaugvorrichtungen dar. Teleskopierbar bedeutet in diesem Fall, dass mehrere komplementär ausgebildete Saugprofile ineinander verschoben werden können und somit die Länge des gesamten Saugprofils verändert werden kann. Hierbei muss sichergestellt sein, dass die beiden komplementären, ineinander greifenden Saugprofile dicht miteinander verbunden sind, beispielsweise mithilfe einer dynamischen Dichtung, so dass über die Länge des Saugprofils ein im wesentlichen gleiches Druckprofil erreicht werden kann.Alternatively, at least one telescoping suction profile and/or at least two suction profiles that mesh with one another can be provided to form a length-variable suction path between the shingling device and the braking device. Telescoping and/or intermeshing suction profiles represent simple mechanical configurations of length-changeable suction devices. In this case, telescoping means that several complementary suction profiles can be pushed into one another and the length of the entire suction profile can thus be changed. It must be ensured here that the two complementary, intermeshing suction profiles are tightly connected to one another, for example with the aid of a dynamic seal, so that a substantially identical pressure profile can be achieved over the length of the suction profile.

Die Ansaugstrecke kann auch aus alternierend angeordneten Saugprofilen gebildet werden, wobei ein erstes Saugprofil in Transportrichtung von der Schuppeinrichtung und ein zweites Saugprofil entgegen der Transportrichtung von der Bremseinrichtung ausgeht und sich die beiden Saugprofile zumindest abschnittsweise quer zur Transportrichtung überlappen. Die beiden Saugprofile können derart kämmend gegeneinander verschoben werden, bis die Vorderkante des einen Saugprofils die Hinterkante des anderen Saugprofils und umgekehrt erreicht. Dann wird die maximale Länge der Ansaugstrecke erreicht.The suction section can also be formed from suction profiles arranged in alternation, with a first suction profile starting in the transport direction from the shingling device and a second suction profile against the transport direction from the braking device, and the two suction profiles overlap at least in sections transversely to the transport direction. The two suction profiles can be displaced in such a way that they mesh with one another until the front edge of one suction profile reaches the rear edge of the other suction profile and vice versa. Then the maximum length of the intake section is reached.

Beide oben genannten Möglichkeiten zur Ausbildung einer längenveränderlichen Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung lassen auch eine verstellbare Anordnung der Bremseinrichtung relativ zur Schuppeinrichtung zu. Soll die Bremseinrichtung in und/oder entgegen der Transportrichtung der Bögen verstellt werden, beispielsweise um die Vorrichtung an ein geändertes Bogenformat anzupassen, kann die Ansaugstrecke zwischen der Schuppeinrichtung und der Bremseinrichtung auf einfache Weise an die veränderte Länge zwischen der Schuppeinrichtung und der Bremseinrichtung angepasst werden.Both of the above-mentioned options for forming a length-variable intake path between the shingle device and the braking device also permit an adjustable arrangement of the braking device relative to the shingle device. If the braking device is to be adjusted in and/or against the transport direction of the sheets, for example in order to adapt the device to a changed sheet format, the suction path between the shingling device and the braking device can be easily adapted to the changed length between the shingling device and the braking device.

Die Erfindung wird im Folgenden anhand der Figuren näher erläutert; es zeigen

Fig. 1
eine schematische Darstellung einer Vorrichtung zur Bildung eines Schuppenstroms von unterlappenden Bögen nach dem Stand der Technik in einer Seitenansicht,
Fig. 2
eine schematische Darstellung einer erfindungsgemäßen Vorrichtung zur Bildung eines Schuppenstroms von unterlappenden Bögen im Betriebszustand in einer Seitenansicht,
Fig. 3
eine schematische Darstellung einer weiteren Ausführungsform einer erfindungsgemäßen Vorrichtung zur Bildung eines Schuppenstromes von unterlappenden Bögen im Betriebszustand in einer Seitenansicht und
Fig. 4
eine schematische Darstellung einer weiteren Ausführungsform einer erfindungsgemäßen Vorrichtung zur Bildung eines Schuppenstroms von unterlappenden Bögen im Betriebszustand in einer Seitenansicht.
The invention is explained in more detail below with reference to the figures; show it
1
a schematic representation of a device for forming an imbricated flow of underlapping sheets according to the prior art in a side view,
2
a schematic representation of a device according to the invention for forming an imbricated stream of overlapping sheets in the operating state in a side view,
3
a schematic representation of a further embodiment of a device according to the invention for forming an imbricated stream of overlapping sheets in the operating state in a side view and
4
a schematic representation of a further embodiment of a device according to the invention for forming an imbricated stream of overlapping sheets in the operating state in a side view.

In Fig. 1 ist schematisch eine aus dem Stand der Technik bekannte Vorrichtung 1 zur Bildung eines Bogenstroms 2 von unterlappenden Bögen 3 aus Papier, Folie oder Karton gezeigt. Die Vorrichtung 1 weist eine nicht dargestellte Zuführeinrichtung auf, die ein quasi endloses Papier- oder Kartonband 4 fördert. Das Band wird mit einer nicht dargestellten Abrolleinrichtung von einer Papier- oder Papprolle auf einer Zuführseite bereitgestellt und kann durch einen zwischen geschalteten Papierspeicher geführt werden. Eine der nicht dargestellten Zuführeinrichtung in Transportrichtung X der Bögen 3 nachgeschaltete Querschneideeinrichtung 5 schneidet das Band 4 in Bögen 3 definierter Länge. Die Querschneideeinrichtung 5 ist in Form einer drehbar gelagerten Welle 6 ausgebildet, die an ihrem Umfang eine Schneide 7 aufweist. Befinden sich die auf der Welle 6 angeordnete Schneide 7 und eine feststehende Schneide 8 im Eingriff, wird das Band 4 geschnitten. Über die Veränderung der Drehgeschwindigkeit der Welle 6 sowie über die Zuführgeschwindigkeit kann die Bogenlänge eingestellt werden.In 1 a device 1 known from the prior art for forming a sheet stream 2 from underlapping sheets 3 made of paper, film or cardboard is shown schematically. The device 1 has a feed device, not shown, which promotes a quasi-endless strip of paper or cardboard 4 . The tape is with an unwinding device, not shown, from a paper or Cardboard roll provided on a feed side and can be passed through an intermediate paper store. A cross-cutting device 5 downstream of the feed device (not shown) in the transport direction X of the sheets 3 cuts the strip 4 into sheets 3 of a defined length. The transverse cutting device 5 is designed in the form of a rotatably mounted shaft 6 which has a cutting edge 7 on its circumference. If the cutting edge 7 arranged on the shaft 6 and a fixed cutting edge 8 are engaged, the strip 4 is cut. The sheet length can be adjusted by changing the rotational speed of the shaft 6 and the feed speed.

Die Bögen 3 werden in Transportrichtung X auf einer Bänderstrecke mit wenigstens einem schnell laufenden Transportband 9 weitertransportiert. Vorzugsweise ist eine Bänderstrecke mit mehreren Transportbändern 9 vorgesehen, die quer zur Transportrichtung X hintereinander liegen und voneinander beabstandet sind. Nachfolgende Ausführungen zum Transportband 9 bezeigen sich auf diese Bänderstrecke.The sheets 3 are transported further in the transport direction X on a conveyor belt with at least one fast-moving conveyor belt 9 . A belt section with a plurality of conveyor belts 9 is preferably provided, which lie one behind the other transversely to the direction of transport X and are spaced apart from one another. The following statements on the conveyor belt 9 refer to this belt section.

Eine der Querschneideeinrichtung 5 nachfolgende Schuppeinrichtung 10 besteht aus einer Anhebeeinheit 11 und einer Verzögerungseinheit 12. Die Verzögerungseinheit 12 weist wenigstens ein oberhalb der Transportebene Y der Bögen 3 angeordnetes Saugband 13 auf. Das Saugband 13 wird gebildet durch ein mit Löchern versehenes Transportband, das mit einem vakuumerzeugenden Saugkasten 14 zusammenwirkt. Die Anhebeeinheit 11 weist eine Schlägerwelle 15 mit wenigstens einem Schläger 16 auf. Der Schläger 16 der Anhebeeinheit 11 drückt bei jeder Umdrehung der Schlägerwelle 15 einen Bogen 3 an das Saugband 13. Da das Saugband 13 mit einer geringeren Geschwindigkeit bewegt wird als das schnell laufende Transportband 9, wird die Vorderkante eines nachlaufenden Bogens 3 unter die angehobene Hinterkante eines vorlaufenden Bogens 3 befördert. Mit der nächsten Umdrehung der Schlägerwelle 16 wird der nachlaufende Bogen 3 an der Hinterkante angehoben, so dass der weiter nachlaufende Bogen 3 unter den nachlaufenden Bogen 3 gefördert werden kann. Auf diese Weise wird ein Bogenstrom 2 von unterlappenden Bögen 3 erzeugt. Befindet sich die Hinterkante des vorlaufenden Bogens 3 nicht mehr im Eingriffsbereich des Saugbandes 13, wird der vorlaufenden Bogen 3 von dem nachlaufenden Bogen 3 oberhalb der Transportebene gehalten, da der nachlaufenden Bogen 3 bereits vom Saugband 13 hochgehalten wird, bevor der vorlaufenden Bogen 3 den Eingriffsbereich des Saugbands 13 verlässt.A shingling device 10 following the cross-cutting device 5 consists of a lifting unit 11 and a delay unit 12. The delay unit 12 has at least one suction belt 13 arranged above the transport plane Y of the sheets 3. The suction belt 13 is formed by a conveyor belt provided with holes, which cooperates with a suction box 14 that generates a vacuum. The lifting unit 11 has a beater shaft 15 with at least one beater 16 . The beater 16 of the lifting unit 11 presses a sheet 3 against the suction belt 13 with each revolution of the beater shaft 15. Since the suction belt 13 is moved at a lower speed than the fast-moving conveyor belt 9, the front edge of a trailing sheet 3 is under the raised rear edge of a leading arch 3 promoted. With the next revolution of the beater shaft 16, the trailing sheet 3 is lifted at the rear edge, so that the sheet 3 that is further trailing can be conveyed under the trailing sheet 3. In this way, an arc stream 2 of underlapping arcs 3 is created. If the trailing edge of the leading sheet 3 is no longer in the gripping area of the suction belt 13, the leading sheet 3 is held above the transport level by the trailing sheet 3, since the trailing sheet 3 is already being held up by the suction belt 13 before the leading sheet 3 leaves the gripping area of the suction belt 13 leaves.

Nach der Schuppeinrichtung 10 ist in Transportrichtung X des Bogenstroms 2 eine Bremseinrichtung 17 vorgesehen. Die Bremseinrichtung 17 weist wenigstens eine Nipprolle 18 auf, die zusammen mit wenigstens einem langsam laufenden Transportband 19 einen Bremsspalt bildet. Der Abstand zwischen der Bremseinrichtung 17 und der Schuppeinrichtung 10 ist so eingestellt, dass die Bogenvorderkante eines Bogens 3 vorzugsweise gerade in den Bremsspalt einläuft und verzögert wird, wenn der hintere Bogenbereich, insbesondere die Hinterkante des Bogens 3, von dem Schläger 16 der Anhebeeinheit 11 an das Saugband 13 gedrückt wird. Der Bogen 3 wird auf diese Weise vorzugsweise ungefähr zeitgleich von der Nipprolle 18 und dem langsam laufenden Transportband 19 im vorderen Bereich und von dem Saugband 13 im hinteren Bogenbereich abgebremst bzw. verzögert. Um den Bogen zu spannen und ein Durchhängen des Bogens zu verringern, weist das Saugband 13 eine leicht verringerte Geschwindigkeit verglichen mit dem langsam laufenden Transportband 19 auf. Im Anschluss an die Bremseinrichtung 17 wird der Bogenstrom 2 mit gleicher Geschwindigkeit und insbesondere im wesentlichen gleicher Schuppenlänge, d.h. mit einem gleichen Abstand von der Vorderkante des vorlaufenden Bogens 3 zur Vorderkante des nachlaufenden Bogens 3, auf einem nicht dargestellten Übergabetisch zu einem nicht dargestellten Übergabepunkt einer weiterverarbeitenden Maschine weitertransportiert.After the shingle device 10 is in the transport direction X of the sheet flow 2 a Braking device 17 is provided. The braking device 17 has at least one nip roller 18 which, together with at least one slowly running conveyor belt 19, forms a braking gap. The distance between the braking device 17 and the shingling device 10 is set in such a way that the front edge of a sheet 3 preferably just enters the braking gap and is decelerated when the rear sheet area, in particular the rear edge of the sheet 3, has passed from the beater 16 of the lifting unit 11 the suction belt 13 is pressed. In this way, the sheet 3 is braked or decelerated preferably approximately at the same time by the nip roller 18 and the slowly running conveyor belt 19 in the front area and by the suction belt 13 in the rear sheet area. In order to stretch the sheet and reduce sagging of the sheet, the suction belt 13 has a slightly reduced speed compared to the slow-running conveyor belt 19. Following braking device 17, sheet stream 2 is conveyed at the same speed and, in particular, with substantially the same stream length, i.e. at the same distance from the leading edge of leading sheet 3 to the leading edge of trailing sheet 3, on a transfer table (not shown) to a transfer point (not shown). further processed machine transported.

Im Bereich zwischen der Querschneideeinrichtung 5 und der Schuppeinrichtung 10 kann unterhalb des Transportbandes 9 ein Saugkasten 20 angeordnet sein. Das Transportband 9 ist dann vorzugsweise als Saugband ausgebildet. Im Saugkasten 20 wird ein Unterdruck erzeugt, wodurch die Bögen gegen das Transportband 9 angezogen werden. Hierdurch wird der Bogen 3 bzw. die Materialbahn 4 vor, während und nachdem Schneiden in der Querschneideeinrichtung 5 auf dem Transportband 9 transportiert.A suction box 20 can be arranged below the conveyor belt 9 in the area between the cross-cutting device 5 and the shingling device 10 . The conveyor belt 9 is then preferably designed as a suction belt. A negative pressure is generated in the suction box 20, as a result of which the sheets are drawn against the conveyor belt 9. As a result, the sheet 3 or the material web 4 is transported on the conveyor belt 9 before, during and after cutting in the cross cutting device 5 .

Wie in Fig. 1 erkennbar ist, ist die Bremseinrichtung 17 in und/oder entgegen der Transportrichtung X der Bögen 3 verstellbar ausgebildet. Dies ist durch den Doppelpfeil 21 dargestellt. Wird die Vorrichtung 1 auf eine anderes Bogenformat umgestellt, wird die Bremseinrichtung 17 derart verstellt, dass der Abstand zwischen der Bremseinrichtung 17 und der Schuppeinrichtung 10 im Wesentlichen der Bogenlänge des neuen Bogenformates entspricht. Der Abstand zwischen der Bremseinrichtung 17 und der Schuppeinrichtung 10 soll derart eingestellt werden, dass der Bogen 3 im Wesentlichen zeitgleich an seiner Vorderkante von der Bremseinrichtung 17 und an seiner Hinterkante von dem Saugband 13 der Schuppeinrichtung 10 abgebremst wird.As in 1 As can be seen, the braking device 17 is designed to be adjustable in and/or counter to the transport direction X of the sheets 3. This is represented by the double arrow 21. If the device 1 is converted to a different sheet format, the braking device 17 is adjusted in such a way that the distance between the braking device 17 and the shingling device 10 essentially corresponds to the sheet length of the new sheet format. The distance between the braking device 17 and the shingling device 10 should be adjusted in such a way that the sheet 3 is braked essentially simultaneously at its front edge by the braking device 17 and at its rear edge by the suction belt 13 of the shingling device 10.

Die Schuppeinrichtung 10 kann dann in Abhängigkeit von der aktuellen (neuen) Bogenlänge relativ zu der Bremseinrichtung 17 in oder entgegen der Transportrichtung der Bögen 3 verfahren, versetzt oder verschoben werden, so dass bei jeder einstellbaren Bogenlänge ein vorlaufender Bogen 3 ungefähr gleichzeitig vorne von der Bremseinrichtung 17 und hinten von der Schuppeinrichtung 10 gebremst wird. Insbesondere wird es ermöglicht, den Abstand zwischen dem Übergabepunkt und der Bremseinrichtung 17 bzw. die Übergabelänge bei einem Formatwechsel konstant zu halten, wobei die Bremseinrichtung 17 bei einem Formatwechsel vorzugsweise nicht verstellt wird. Stattdessen wird der Abstand zwischen der vorzugsweise ortsfest angeordneten Bremseinrichtung 17 und der Schuppeinrichtung 10 durch Verstellen der Schuppeinrichtung 10 an die tatsächliche Bogenlänge angepasst. So bleibt der Abstand zwischen dem vorderen Übergabepunkt der Bögen 3 an eine Bogenverarbeitungsmaschine und der Bremseinrichtung 17 bzw. die Übergabelänge für unterschiedliche Formate bzw. Schnittlängen gleich, was zu einer erheblichen Vereinfachung bei der Einstellung der Vorrichtung auf ein anderes Bogenformat führt. Insbesondere entfällt bei gleichbleibender Übergabelänge die Notwendigkeit, die Überlappungslänge der Bögen 3 im Schuppenstrom bei einem Formatwechsel zu verändern.Depending on the current (new) sheet length, the shingling device 10 can then be moved, offset or shifted relative to the braking device 17 in or against the transport direction of the sheets 3, so that for each adjustable sheet length a leading sheet 3 is removed from the braking device at about the same time 17 and is braked at the rear by the scale device 10. In particular, it is possible to keep the distance between the transfer point and the braking device 17 or the transfer length constant during a format change, with the braking device 17 preferably not being adjusted during a format change. Instead, the distance between the braking device 17, which is preferably arranged in a stationary manner, and the shingling device 10 is adapted to the actual sheet length by adjusting the shingling device 10. The distance between the front transfer point of the sheets 3 to a sheet processing machine and the braking device 17 or the transfer length for different formats or cutting lengths remains the same, which leads to a considerable simplification when setting the device to a different sheet format. In particular, if the transfer length remains the same, there is no need to change the overlapping length of the sheets 3 in the scale flow when there is a format change.

Es hat sich bei der in Fig. 1 dargestellten Vorrichtung 1 gezeigt, dass der Transport der Bogenvorderkante des Bogens 3 zwischen der Schuppeinrichtung 10 und der Bremseinrichtung 17 störanfällig ist. So kann die Vorderkante des Bogens 3 insbesondere bei hohen Transportgeschwindigkeiten von dem schnell laufenden Transportband 9 abgelöst werden. Durch ein Ablösen der Bogenvorderkante von dem Transportband 9 kann der Bogen 3 beim Eintritt in den Bremsspalt der Bremseinrichtung 17 beschädigt werden. Des Weiteren kann der Bogen 3 durch ein Ablösen der Bogenvorderkante aus seiner Position gebracht werden, so dass im Anschluss eine nicht exakte Schuppenlänge zwischen der Vorderkante des vorlaufenden Bogens 3 und der Vorderkante des nachlaufenden Bogens 3 gebildet wird. Darüber hinaus kann die Bogenvorderkante beim Ablösen vom schnell laufenden Transportband 9 oder durch ein Verrutschen in einen Reibkontakt mit dem vorlaufenden Bogen 3 gelangen. Hierdurch kann der Bogen 3 zusätzlich abgebremst werden, so dass die gewünschte Schuppungslänge ebenfalls nicht erreicht wird.It has changed at the in 1 Device 1 shown shown that the transport of the sheet leading edge of the sheet 3 between the shingle device 10 and the braking device 17 is prone to failure. In this way, the leading edge of the sheet 3 can be detached from the fast-moving conveyor belt 9, particularly at high transport speeds. If the leading edge of the sheet detaches from the conveyor belt 9, the sheet 3 can be damaged when it enters the braking gap of the braking device 17. Furthermore, the sheet 3 can be brought out of position by detaching the leading edge of the sheet, so that an imprecise shingle length is subsequently formed between the leading edge of the leading sheet 3 and the leading edge of the trailing sheet 3 . In addition, the leading edge of the sheet can come into frictional contact with the leading sheet 3 when it is detached from the fast-moving conveyor belt 9 or slips. As a result, the sheet 3 can also be decelerated, so that the desired shingle length is also not reached.

In Fig. 2 ist schematisch eine andere Vorrichtung 1 zur Bildung eines Schuppenstroms 2 von unterlappenden Bögen 3 in einer Seitenansicht gezeigt. Gleiche oder übereinstimmende Funktionseinheiten, Baugruppen, Bauteile sowie sonstige übereinstimmende Merkmale der in den Figuren 1 und 2 gezeigten Vorrichtung 1 sind mit gleichen Bezugszeichen versehen. Die Bildung eines Schuppenstroms 2 von unterlappenden Bögen 3 aus Papier, Folie oder Karton erfolgt bei der in Fig. 2 gezeigten Ausführungsform entsprechend der oben beschriebenen Schuppenstrombildung bei der Vorrichtung 1 aus Fig. 1.In 2 another device 1 for forming an imbricated stream 2 of overlapping sheets 3 is shown schematically in a side view. Identical or matching functional units, assemblies, components and other matching features in the Figures 1 and 2 shown device 1 are provided with the same reference numbers. The formation of an imbricated stream 2 of overlapping sheets 3 of paper, foil or cardboard takes place in the in 2 shown embodiment corresponding to the above-described imbricated stream formation in the device 1 1 .

Abweichend zu der in Fig. 1 gezeigten Vorrichtung 1 ist bei der Ausführungsform gemäß Fig. 2 vorgesehen, dass die Schuppeinrichtung 10 in und/oder entgegen der Transportrichtung X abhängig von der Bogenlänge bzw. den Bogenformat verstellbar ausgebildet ist. Dies ist in Fig. 2 schematisch durch den Doppelpfeil 21 gezeigt. Die Bremseinrichtung 17 ist dagegen in und/oder entgegen der Transportrichtung X der Bögen 3 unverstellbar ausgebildet. Mit anderen Worten ausgedrückt bedeutet dies, dass die Schuppeinrichtung 10 bei einer Änderung der Schnittlänge der Bögen 3 bzw. bei einem Wechsel des Bogenformats die Schuppeinrichtung 10 relativ zu der Bremseinrichtung 17 so versetzt, verschoben oder verfahren wird, dass bei jeder eingestellten Bogenlänge ein vorlaufender Bogen 3 ungefähr gleichzeitig vorne von der Bremseinrichtung 17 und hinten von der Verzögerungseinheit 12 der Schuppeinrichtung 10 gebremst wird. So bleibt der Abstand zwischen dem nicht dargestellten Übergabepunkt der Bögen 3 an eine weiterverarbeitende Maschine und der Bremseinrichtung 17 bzw. die Übergabelänge für unterschiedliche Formate bzw. Schnittlängen der Bögen 3 gleich, was zu einer erheblichen Vereinfachung bei der Einstellung der in Fig. 2 gezeigten Vorrichtung 1 auf ein anderes Bogenformat führt. Für einen Formatwechsel kann die Schuppeinrichtung 10 insgesamt in oder entgegen der Transportrichtung X des Bogenstroms 2 verstellt werden, d.h. es werden die Anhebeeinheit 11 und die Verzögerungseinheit 12 gemeinsam bewegt, die zu diesem Zweck in einem in und/oder entgegen der Transportrichtung X der Bögen 3 bewegbaren Fahrgestell oder Rahmen oder Träger aufgenommen bzw. montiert sein können. Grundsätzlich ist es aber auch möglich, dass bei ausreichender Erstreckung des Saugbandes 13 in Transportrichtung X lediglich die Schlägerwelle 15 mit dem Schläger 16 in oder entgegen der Transportrichtung X verstellt wird.Deviating from the in 1 Device 1 shown is in accordance with the embodiment 2 provided that the shingle device 10 is designed to be adjustable in and/or counter to the transport direction X depending on the sheet length or the sheet format. this is in 2 shown schematically by the double arrow 21. The braking device 17, on the other hand, is non-adjustable in and/or opposite to the transport direction X of the sheets 3. In other words, this means that when the cutting length of the sheets 3 changes or when the sheet format changes, the shingling device 10 is offset, shifted or moved relative to the braking device 17 in such a way that a leading sheet is produced for each sheet length that is set 3 is braked approximately simultaneously at the front by the braking device 17 and at the rear by the delay unit 12 of the shingle device 10 . The distance between the transfer point (not shown) of the sheets 3 to a further processing machine and the braking device 17 or the transfer length for different formats or cut lengths of the sheets 3 remains the same, which simplifies the setting of the in 2 shown device 1 leads to a different sheet format. For a format change, the stacking device 10 can be adjusted overall in or counter to the transport direction X of the sheet flow 2, i.e. the lifting unit 11 and the delay unit 12 are moved together, which for this purpose are in and/or counter to the transport direction X of the sheets 3 movable chassis or frame or carrier can be included or mounted. In principle, however, it is also possible that if the suction belt 13 extends sufficiently in the transport direction X, only the beater shaft 15 with the beater 16 is adjusted in or against the transport direction X.

Bei der in Fig. 2 dargestellten Vorrichtung 1 ist zwischen der Schuppeinrichtung 10 und der Bremseinrichtung 17 unterhalb des schnell laufenden Transportbandes 9 ein Saugprofil 22 vorgesehen, das als Hohlprofil ausgebildet und an eine nicht dargestellte Ansaugeinrichtung, wie beispielsweise ein Absauggebläse, angeschlossen ist. Vorzugsweise ist bei einer Bänderstrecke mit einer Mehrzahl von als Saugbändern ausgebildeten Transportbändern 9 jedem Transportband 9 ein Saugprofil 22 zugeordnet.At the in 2 In the device 1 shown, a suction profile 22 is provided between the shingling device 10 and the braking device 17 below the high-speed conveyor belt 9, which profile is designed as a hollow profile and is connected to a suction device (not shown), such as a suction fan. In a belt section with a plurality of conveyor belts 9 designed as suction belts, each conveyor belt 9 is preferably assigned a suction profile 22 .

Oberhalb eines Längenabschnitts des Saugprofils 22 und des zugeordneten Abschnitts des Transportbandes 9 wird zwischen der Schuppeinrichtung 10 und der Bremseinrichtung 17 wird eine erste Ansaugstrecke 24 und im Bereich zwischen der Schuppeinrichtung 10 und der Querschneideeinrichtung 5 eine weitere Ansaugstrecke 25 ausgebildet. Über das Saugprofil 22 und das Transportband 9 wirkt ein Unterdruck auf die Bögen 3 wenigstens im Bereich der Vorderkante der Bögen 3. Durch den aufgebrachten Unterdruck wird ein Ablösen der Vorderkante eines Bogens 3 verhindert. Gleichzeitig wird durch die Ausbildung der Ansaugstrecke 24 der nachlaufende Bogen 3 nach dem Passieren der Schuppeinrichtung 10 in einer definierten Position weitertransportiert. Somit ist eine definierte Unterschuppung der Bögen 3 möglich, ohne dass sich die Bögen 3 gegenseitig behindern. Das Saugprofil 22 erstreckt sich vorzugsweise über die gesamte Länge des Bereichs zwischen der Querschneideeinrichtung 5 und der Bremseinrichtung 17. Im Bereich vor der Schuppeinrichtung 10 wird durch das Saugprofil 22 die weitere Ansaugstrecke 25 ausgebildet.Above a longitudinal section of the suction profile 22 and the associated section of the conveyor belt 9, a first suction section 24 is formed between the shingling device 10 and the braking device 17, and a further suction section 25 is formed in the area between the shingling device 10 and the cross-cutting device 5. A negative pressure acts on the sheets 3 at least in the area of the leading edge of the sheets 3 via the suction profile 22 and the conveyor belt 9. The applied negative pressure prevents the leading edge of a sheet 3 from becoming detached. At the same time, the formation of the suction section 24 means that the following sheet 3 is transported further in a defined position after it has passed the shingling device 10 . It is thus possible for the arches 3 to overlap in a defined manner without the arches 3 interfering with one another. The suction profile 22 preferably extends over the entire length of the area between the cross-cutting device 5 and the braking device 17. In the area in front of the shingling device 10, the further suction section 25 is formed by the suction profile 22.

Der am Saugprofil 22 anliegende Unterdruck soll dabei im Bereich der der Schuppeinrichtung 10 in Transportrichtung X nachfolgenden Ansaugstrecke 24 deutlich weniger stark sein sein als der im Bereich der weiteren Ansaugstrecke 25 anliegende Unterdruck zwischen der Querschneideeinrichtung 5 und der Schuppeinrichtung 10. Im Bereich der Schuppeinrichtung 10, genauer im Bereich der Schlägerwelle 15 mit dem Schläger 16, ist ein Abschnitt 23 vorgesehen, an dem kein Unterdruck oder ein vergleichsweise weniger starker Unterdruck anliegt. Auf diese Weise kann der Bogen 3 auf einfache Weise im Bereich 23 angehoben und gegen das Saugband 13 gedrückt werden. Im Bereich der Bogenhinterkante muss die Anhebeeinheit 11 somit nicht einem Unterdruck entgegenwirken, der den Bogen 3 mit seiner Hinterkante auf dem schnell laufenden Transportband 9 halten würde. Somit ist ein lage- und positionsgenauer Transport des nachlaufenden Bogens 3 unter den hochgeschlagenen vorlaufenden Bogen 3 möglich, während gleichzeitig die Bogenhinterkante ohne Beeinträchtigung von dem Schläger 16 gegen das Saugband 13 gedrückt werden kann.The negative pressure applied to the suction profile 22 should be significantly less strong in the area of the suction section 24 following the shingling device 10 in the transport direction X than the negative pressure present in the area of the further suction section 25 between the cross-cutting device 5 and the shingling device 10. In the area of the shingling device 10, more precisely in the area of the beater shaft 15 with the beater 16, a section 23 is provided on which no negative pressure or a comparatively less strong negative pressure is present. In this way, the sheet 3 can be lifted in the area 23 and pressed against the suction belt 13 in a simple manner. In the area of the trailing edge of the sheet, the lifting unit 11 therefore does not have to counteract a negative pressure that would hold the trailing edge of the sheet 3 on the fast-moving conveyor belt 9 . It is thus possible for the trailing sheet 3 to be transported in the correct location and position under the leading sheet 3 that has been folded up, while at the same time the trailing edge of the sheet can be pressed against the suction belt 13 by the beater 16 without being adversely affected.

Das Saugprofil 22 kann vorzugsweise durch ein durchgängiges Holhprofil gebildet werden. Die unterschiedlichen Höhen des Vakuums im Bereich der Ansaugstrecke 24 und der Ansaugstrecke 25 können durch eine Sperre bzw. Dichtung im Bereich der Schuppeinrichtung 10 erreicht werden. In diesem Fall ist es möglich, lediglich eine unterdruckerzeugende Einrichtung vorzusehen, die an das Saugprofil 22 im Bereich der Ansaugstrecke 25 angeschlossen ist. Über die Sperre wird gleichzeitig in der Ansaugstrecke 24 ein niedriger Unterdruck erzeugt. Die Druckabsenkung im Bereich der Ansaugstrecke 24 gegenüber dem Umgebungsdruck ist vorzugsweise deutlich geringer als die Druckabsenkung im Bereich der Ansaugstrecke 25.The suction profile 22 can preferably be formed by a continuous hollow profile. The different levels of vacuum in the area of the suction section 24 and the suction section 25 can be achieved by a barrier or seal in the area of the scale device 10 . In this case, it is possible to provide only one vacuum-generating device that is connected to the suction profile 22 in the Area of the intake section 25 is connected. At the same time, a low negative pressure is generated in the intake path 24 via the barrier. The pressure reduction in the area of the intake section 24 compared to the ambient pressure is preferably significantly lower than the pressure reduction in the area of the intake section 25.

Es ist vorteilhaft, wenn die Sperre in dem Profil, dass die Ansaugstrecken 24, 25 ausbildet, in und/oder entgegen der Transportrichtung X der Bögen 3 bewegbar, insbesondere verschiebbar, ausgebildet ist. Somit kann auf einfache Weise durch Verstellen der Sperre die Länge der Ansaugstrecke 24 an das Bogenformat angepasst werden. Gleichzeitig wird auch die Länge der Ansaugstrecke 25 verändert, so dass die Bögen 3 in einer definierten Position und lagegerecht von der Querschneideeinrichtung 5 zur Schuppeinrichtung 10 transportiert werden.It is advantageous if the barrier in the profile that forms the suction sections 24, 25 is designed to be movable, in particular displaceable, in and/or counter to the transport direction X of the sheets 3. Thus, the length of the intake section 24 can be adapted to the sheet format in a simple manner by adjusting the lock. At the same time, the length of the suction section 25 is also changed, so that the sheets 3 are transported in a defined position and in the correct position from the cross-cutting device 5 to the shingling device 10 .

Besonders vorteilhaft ist es, wenn die bewegliche Sperre zusammen mit der Anhebeeinheit 11 und/oder der gesamten Schuppeinrichtung 10 in und/oder entgegen der Transportrichtung X der Bögen 3 verstellbar ausgebildet ist. Dazu kann ein nicht dargestellter Wagen, ein Gerüst oder ein Gestell vorgesehen sein, in dem die Schuppeinrichtung 10 sowie die bewegliche Sperre angeordnet sind, wobei der Wagen in und/oder entgegen der Transportrichtung X der Bögen 3 verfahren werden kann. Somit kann die Vorrichtung 1 in einfacher Weise auf ein neues bzw. geändertes Bogenformat eingestellt werden.It is particularly advantageous if the movable barrier is designed to be adjustable together with the lifting unit 11 and/or the entire shingling device 10 in and/or counter to the transport direction X of the sheets 3. For this purpose, a carriage (not shown), a scaffolding or a frame can be provided in which the shingling device 10 and the movable barrier are arranged, the carriage being able to be moved in and/or counter to the transport direction X of the sheets 3 . Thus, the device 1 can easily be set to a new or changed sheet format.

Sofern das Saugband 13 der Schuppeinrichtung 10 sich über eine ausreichend lange Strecke in Transportrichtung X der Bögen erstreckt, kann auch vorgesehen sein, dass lediglich die Anhebeeinheit 11 und die bewegliche Sperre zusammen in und/oder entgegen der Transportrichtung X der Bögen 3 verstellt werden.If the suction belt 13 of the shingling device 10 extends over a sufficiently long distance in the transport direction X of the sheets, it can also be provided that only the lifting unit 11 and the movable lock are adjusted together in and/or counter to the transport direction X of the sheets 3.

In Fig. 3 ist schematisch eine andere Vorrichtung 1 zur Bildung eines Schuppenstroms 2 von unterlappenden Bögen 3 in einer Seitenansicht gezeigt. Gleiche oder übereinstimmende Funktionseinheiten, Baugruppen, Bauteile sowie sonstige übereinstimmende Merkmale der in den Fig. 1, 2 und 3 gezeigten Vorrichtung 1 sind mit gleichen Bezugszeichen versehen. Die Bildung eines Schuppenstroms 2 von unterlappenden Bögen 3 aus Papier, Folie oder Karton erfolgt bei der in Fig. 3 gezeigten Ausführungsform entsprechend der oben beschriebenen Schuppenstrombildung bei der Vorrichtung 1 aus Fig. 1.In 3 another device 1 for forming an imbricated stream 2 of overlapping sheets 3 is shown schematically in a side view. Identical or matching functional units, assemblies, components and other matching features in the Figures 1, 2 and 3 Device 1 shown are provided with the same reference numerals. The formation of an imbricated stream 2 of overlapping sheets 3 of paper, foil or cardboard takes place in the in 3 shown embodiment corresponding to the above-described imbricated stream formation in the device 1 1 .

Abweichend zu der Vorrichtung 1 aus Fig. 2 ist die Bremseinrichtung 17 in und/oder entgegen der Transportrichtung X der Bögen 3 gemäß des Doppelpfeils 21 verschiebbar bzw. verstellbar ausgebildet, um die Vorrichtung 1 an ein geändertes Bogenformat anpassen zu können. Die Schuppeinrichtung 10 ist in der in Fig. 3 gezeigten Vorrichtung 1 lagefixiert und somit nicht in und/oder entgegen der Transportrichtung X der Bögen 3 verstellbar.Deviating from the device 1 from 2 is the braking device 17 in and/or counter to the transport direction X of the sheets 3 according to the double arrow 21 designed to be displaceable or adjustable in order to be able to adapt the device 1 to a changed sheet format. The scale device 10 is in 3 shown device 1 fixed in position and thus not in and / or opposite to the transport direction X of the sheets 3 adjustable.

Die Ansaugstrecke 24 wird gemäß Fig. 3 gebildet durch wenigstens ein teleskopierbares Saugprofil, das aus ineinander schiebbaren Saugprofilabschnitten 26 und 27 besteht und mit einer Ansaugeinrichtung verbunden ist. Vorzugsweise ist der Saugprofilabschnitt 27 ortsfest angeordnet und der Saugprofilabschnitt 26 ist vorzugsweise in und/oder entgegen der Transportrichtung X der Bögen 3 verschiebbar ausgebildet. Die Länge der Ansaugstrecke 24 kann so ebenfalls an das Bogenformat angepasst werden.The intake section 24 is in accordance with 3 formed by at least one telescoping suction profile, which consists of telescoping suction profile sections 26 and 27 and is connected to a suction device. The suction profile section 27 is preferably arranged in a stationary manner and the suction profile section 26 is preferably designed to be displaceable in and/or counter to the transport direction X of the sheets 3 . The length of the intake section 24 can also be adapted to the sheet format.

In Fig. 4 ist schematisch eine weitere Vorrichtung 1 zur Bildung eines Schuppenstroms 2 von unterlappenden Bögen 3 in einer Seitenansicht gezeigt. Gleiche oder übereinstimmende Funktionseinheiten, Baugruppen, Bauteile sowie sonstige übereinstimmende Merkmale der in den Fig. 1, 2, 3 und 4 gezeigten Vorrichtung 1 sind mit gleichen Bezugszeichen versehen. Die Bildung eines Schuppenstroms 2 von unterlappenden Bögen 3 aus Papier, Folie oder Karton erfolgt bei der in Fig. 2 gezeigten Ausführungsform entsprechend der oben beschriebenen Schuppenstrombildung bei der Vorrichtung 1 aus Fig. 1.In 4 a further device 1 for forming an imbricated stream 2 of overlapping sheets 3 is shown schematically in a side view. Identical or matching functional units, assemblies, components and other matching features in the Figures 1, 2 , 3 and 4 Device 1 shown are provided with the same reference numerals. The formation of an imbricated stream 2 of overlapping sheets 3 of paper, foil or cardboard takes place in the in 2 shown embodiment corresponding to the above-described imbricated stream formation in the device 1 1 .

Die in Fig. 4 gezeigte Ausführungsform der Vorrichtung 1 unterscheidet sich gegenüber der in Fig. 3 gezeigten Ausführungsform der Vorrichtung 1 dahingehend, dass die Ansaugstrecke 24 aus wenigstens 2 miteinander kämmenden Saugprofilen 28 und 29 gebildet ist, die sich wenigstens abschnittsweise quer zur Transportrichtung X der Bögen 3 überlappen können. Die Saugprofile 28, 29 sind wiederum an wenigstens eine Ansaugeinrichtung angeschlossen. Quer zur Transportrichtung X der Bögen 3 können die kämmenden Saugprofile 28, 29 alternierend ausgebildet sein.In the 4 shown embodiment of the device 1 differs from that in 3 shown embodiment of the device 1 in that the suction section 24 is formed from at least 2 intermeshing suction profiles 28 and 29, which can overlap at least in sections transversely to the transport direction X of the sheets 3. The suction profiles 28, 29 are in turn connected to at least one suction device. Crosswise to the direction of transport X of the sheets 3, the combing suction profiles 28, 29 can be formed in an alternating manner.

Befindet sich die Hinterkante des Saugprofils 29 auf Höhe der Vorderkante des Saugprofils 28 ist die maximale Länge der Ansaugstrecke 24 erreicht. Werden die Saugprofile 28, 29 kämmend ineinander geschoben, beispielsweise das Saugprofil 28 entgegen der Transportrichtung X der Bögen, wird die Länge der Ansaugstrecke 24 verringert.If the rear edge of the suction profile 29 is level with the front edge of the suction profile 28, the maximum length of the suction section 24 has been reached. If the suction profiles 28, 29 are pushed into one another so as to mesh, for example the suction profile 28 counter to the transport direction X of the sheets, the length of the suction section 24 is reduced.

Bezugszeichenliste:Reference list:

11
Vorrichtungcontraption
22
Bogenstromarc current
33
Bogenarc
44
Bandtape
55
Querschneideeinrichtungcross cutting device
66
WelleWave
77
Schneidecutting edge
88th
Schneidecutting edge
99
Transportbandconveyor belt
1010
Schuppeneinrichtungshed facility
1111
Anhebeeinheitlifting unit
1212
Verzögerungseinheitdelay unit
1313
Saugbandsuction belt
1414
Saugkastensuction box
1515
Schlägerwelleracket shaft
1616
Schlägerbat
1717
Bremseinrichtungbraking device
1818
Nipprollenip roller
1919
Transportbandconveyor belt
2020
Saugkastensuction box
2121
Doppelpfeildouble arrow
2222
Saugprofilsuction profile
2323
AbschnittSection
2424
Ansaugstreckesuction line
2525
Ansaugstreckesuction line
2626
Saugprofilabschnittsuction profile section
2727
Saugprofilabschnittsuction profile section
2828
Saugprofilsuction profile
2929
Saugprofilsuction profile
XX
Transportrichtungtransport direction
YY
Transportebenetransport level

Claims (8)

  1. Device (1), in particular a sheeter, for forming an imbricated stream of underlapping sheets (3), in particular of paper or board sheets, having a transport device for transporting sheets, having an shingling device (10) for underlapping the sheets (3) in regions, with a braking device (17), following the shingling device (10) in the transport direction (X) of the sheets (3), for braking shingled sheets (3), in particular by forming a braking gap for the passage of sheets (3) brought together in a shingled manner, and with a transverse cutting device (5), upstream of the shingling device (10), for cutting a material strip into individual sheets (3), characterized in that a suction section (24) is provided between the shingling device (10) and the braking device (17) for sucking and transporting a sheet (3) trailing in the shingled stream into the braking device (17), a further suction section (25) is provided between the cross-cutting device (5) and the shingling device (10), and the pressure level in the region of the suction section (24) between the shingling device (10) and the braking device (17) is lowered to a lesser extent than in the region of the further suction section (25).
  2. Device (1) according to claim 1, characterized in that the intake section (24) between the shingling device (10) and the braking device (17) and the further intake section (25) are interrupted in the region of the shingling device (10).
  3. Device (1) according to claim 1 or 2, characterized in that the shingling device (10) is designed to be adjustable in and/or against the transport direction of the sheets (3) as a function of the cutting length.
  4. Device (1) according to one of the preceding claims, characterized in that the transport device has at least one suction belt (9), in particular a belt arrangement with a plurality of suction belts (9) running parallel to one another, the suction belt (9) being guided continuously in the transport direction of the sheets (3) over both suction sections (24, 25) and the region of the shingling device (10).
  5. Device (1) according to one of the preceding claims, characterized in that at least one suction device for forming a suction section (24, 25) is provided, the suction device having a suction profile (22, 28, 29) or a suction box and/or being connected thereto.
  6. Device (1) according to claim 5, characterized in that at least one continuous suction profile (22), in particular an arrangement of several suction profiles (22) lying one behind the other transversely to the transport direction of the sheets (3), or a continuous suction box is provided for lowering the pressure and forming the suction section (24) between the overlapping device and the braking device (17) and for forming the further suction section (25).
  7. Device (1) according to claim 6, characterized in that a non-steady reduction of the pressure reduction in the region of the scaling device (10) is provided over the length of the suction profile (22) or suction box, wherein, preferably, the suction profile (22) or the suction box has a barrier movable in and/or against the transport direction for forming a non-steady reduction of the pressure reduction and wherein, further preferably, the movable barrier is designed to be adjustable together with the scaling device (10) in and/or against the transport direction of the sheets (3).
  8. Method for forming an imbricated stream (2) of underlapping sheets (3), in particular of paper or board sheets, further in particular for forming an imbricated stream (2) of individual sheets (3) cut from a material strip (4) by means of a transverse cutting device (5), wherein separated sheets (3) are transported to an shingling device (10) and are underlapped in regions, in order to produce an imbricated stream (2), the imbricated sheets (3) being braked by a braking device (17) following the imbrication device (10) in the transport direction (X) of the sheets (3), carried out with an apparatus (1) according to one of the preceding claims, wherein the trailing sheets (3) of an imbricated stream are transported into the braking device (17) under the action of suction.
EP18734471.8A 2017-06-14 2018-06-14 Apparatus and method for positionally defined transport of sheets Active EP3619153B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503531A1 (en) * 1991-03-15 1992-09-16 Georg Spiess GmbH Device for realising a formation of underlapping objects

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US20200165094A1 (en) 2020-05-28
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