EP1314670A1 - Méthode et appareil pour freiner des feuilles - Google Patents

Méthode et appareil pour freiner des feuilles Download PDF

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Publication number
EP1314670A1
EP1314670A1 EP02023699A EP02023699A EP1314670A1 EP 1314670 A1 EP1314670 A1 EP 1314670A1 EP 02023699 A EP02023699 A EP 02023699A EP 02023699 A EP02023699 A EP 02023699A EP 1314670 A1 EP1314670 A1 EP 1314670A1
Authority
EP
European Patent Office
Prior art keywords
sheet
vacuum
braking
suction
printed sheets
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.)
Withdrawn
Application number
EP02023699A
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German (de)
English (en)
Inventor
Volkmar Schwitzky
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.)
Koenig and Bauer AG
Original Assignee
Koenig and Bauer AG
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 Koenig and Bauer AG filed Critical Koenig and Bauer AG
Publication of EP1314670A1 publication Critical patent/EP1314670A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/68—Reducing the speed of articles as they advance
    • B65H29/686—Pneumatic brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/34—Pressure, e.g. fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • the invention relates to a method and a device for braking printed sheets in the delivery of a sheet processing machine, in the printed sheet via a sheet brake are supplied, which is connected to a vacuum source, so that in one A vacuum can be created in the suction area, under the effect of which the supplied Printing sheet is sucked in and braked.
  • an absorbent body is formed that extends across the format width.
  • the suction roller rotates in the delivery at a peripheral speed which is less than the speed of the gripper system and captures the printed sheet under the effect of the negative pressure.
  • the negative pressure applied inside can have the same effect on the printed sheet via recesses in the surrounding suction band.
  • the braking effect results from the frictional forces acting between the suction bodies and the pressure sheet.
  • the absorbent body In order to achieve a sufficiently large braking effect, the absorbent body must have a correspondingly large suction surface and the highest possible negative pressure must be present.
  • the absorbent body must have a good starting behavior, which means that the printed sheet is safely sucked in by the absorbent bodies even at a distance of several millimeters.
  • the suction bodies must be able to suck in a correspondingly large volume of air. Since the printed sheets are fed to the filing stack at a system-related distance from one another, the absorbent bodies are covered or not covered by the printed sheets in a constant alternation. Depending on the format length and arrangement of the gripper systems in the delivery, the suction roller is not covered between 20 to 70%. During this time, the vacuum inside the suction body and in the entire vacuum line system is reduced. In order to adapt the suction behavior to changing substrates, the suction power is set on the sheet brake.
  • a device of the type mentioned is disclosed in DE 34 13 179 A1, in which the adjacent one Vacuum can be influenced by controlling a control valve. Disadvantageous This solution is that a relatively large suction power must be generated in order to be safe Ensure that the printing sheet starts up. In the time interval between two consecutive printed sheets in which the suction openings of the sheet brake with are in contact with the surrounding medium, the vacuum generated by the suction pump dismantled unused.
  • DE 43 28 445 A1 shows a device for conveying sheets that are made of a control unit with upstream sensors and a blowing or suction device and a fixed sheet guiding device. According to the signals of the The blowing or suction device can control the movement of the sheet detecting sensors to avoid fluttering of the printed sheets.
  • the invention has for its object to provide a method and an apparatus with which the suction behavior of pneumatically working bow brakes is improved and the suction power requirement can be reduced.
  • the printed sheet conveyed in the gripper closure is in the delivery is captured and braked by a suction body, which is why on the outer radius the rotating or rotating suction body applied vacuum over time and is controlled depending on the format length or the sheet position.
  • a sensor system can be provided for detecting the position of the sheet, which can consist of one or more sensors which are arranged along the sheet path.
  • the sheet position is determined on the basis of the sensor signals which are processed in a control unit.
  • corresponding control commands are output to the downstream actuators.
  • optical sensors such as light barriers or other sensor forms suitable for sheet detection can be used as sensors.
  • the use of two sensors in the form of reflection light barriers has proven to be advantageous, one of which is arranged in a line with the suction body, while the other is arranged behind the first sensor in the direction of sheet travel and preferably displaceably along the sheet path.
  • the control unit only receives input signals and forwards corresponding control signals to the actuators when a printed sheet is conveyed in the delivery.
  • the permanent vacuum generator can be separated from the suction roller.
  • the actuators are controlled without additional ones Sensors.
  • the position of the print sheet is based on that on the machine control applied signals determined. This is done by taking the Gripper car, the machine speed and that of the operator at the control center entered format length of the clock for a control of the control elements in the vacuum system calculated and then in the form of control commands to the control elements is passed on.
  • the advantage of this solution is the low technical effort.
  • there is also one from the machine control provide controllable valve and the control logic according to the invention in implement the machine control as part of the program.
  • the suction rings mounted on the suction roller in a rotationally fixed manner can be supplied via separate supply lines or a common supply line.
  • valves are arranged in each supply line in the first case and in the second In this case, a single valve is provided.
  • separate supply lines there is a side effect the possibility, with small format widths, of the negative pressure in the outer areas to be able to turn it off automatically.
  • the valves are arranged as close as possible to the suction elements.
  • the storage volume of the vacuum line system can be increased and, on the other hand, the light-off behavior of the suction elements can be changed in an advantageous manner.
  • By closing the valves a space that is sealed off from the environment is created inside the vacuum lines located between the valves and the vacuum generator. This acts as a vacuum accumulator when the valves are closed.
  • the storage volume can be increased by the design of the vacuum lines, for example by lengthening them or selecting suitable diameters. This may be necessary to temporarily store sufficient negative pressure even for large format lengths.
  • a separate vacuum reservoir in the line path can also be provided for storing the vacuum.
  • the valves are closed and the permanently working negative pressure generator builds up an increasing negative pressure inside the pipe system and possibly also in the additional storage.
  • the maximum vacuum that can be achieved by the vacuum generator is reached inside the pipe system shortly after the valve closes. It is advantageous that, when the valve opens, this maximum negative pressure is immediately present on the absorbent body and the starting behavior of the absorbent body is improved.
  • the braking effect required in the delivery can thus be achieved, in particular when processing short formats, with comparatively low-power vacuum generators which, in addition to lower acquisition costs, also have a lower energy requirement.
  • the sheet delivery arm accommodates a sheet stack 4 stacked on a pallet 8 in its interior.
  • the printed sheets 3 to be stacked are fed individually to the sheet stack 4 in the gripper closure.
  • the grippers are located inside the gripper carriage 2 and are supported there on gripper shafts.
  • a print sheet 3 is transported from each of the gripper carriages 2 rotating at a constant speed and guided on chains.
  • the grippers open and thus release the printed sheet 3 when the respective gripper carriage 2 is above the sheet stack 4 .
  • the printed sheet 3 still has the speed of the gripper carriage 2 . With the release of the printing sheet 3 of the printing sheet 3 falls under the effect of gravity on the sheet stack 4, where it is aligned with the help of stack stops 6. 7
  • a pneumatic sheet braking system is in the form of a suction roller 5.
  • the suction roller 5 is designed so that a vacuum can be applied to it by means of suitable feeding means, which caused by the structure of the suction roller 5, Spreads over channels in the part of the circumference facing the printing sheets 3 , the so-called suction area of the suction roller 5 .
  • suitable sheet braking systems such as, for example, rotating suction belts can also be provided. While the leading edge of the printed sheet is positively guided until the gripper opens, the flexurally elastic printed sheet 3 is caught by the sheet brake in the area downstream of the leading edge under the effect of the negative pressure.
  • the peripheral speed at which the suction roll 5 rotates is less than the speed of the unbraked printing sheet 3 .
  • the printed sheet 3 is braked as soon as the grippers have opened.
  • the vacuum required to operate the pneumatic sheet brake is supplied by a vacuum generator and fed to the suction roll 5 via vacuum lines 10 .
  • a suction pump or a venturi nozzle system charged with compressed air can be provided as the vacuum generator 12 .
  • a valve 1 is interposed in the line 10 , which can be controlled via a control unit, not shown.
  • a vacuum accumulator 11 can also be arranged in the line path.
  • the first is preferably arranged on a line with the longitudinal axis of the suction roll and the second behind it in the direction of sheet travel.
  • the diagram shows the vacuum profiles determined at the measurement point 9 in the interior of the vacuum lines 10 .
  • the lower curve corresponds to a typical actual profile 14 according to the prior art.
  • the upper curve shows the course 15 according to the invention .
  • the negative pressure is plotted against the time for two consecutive sheets.
  • point A 16 marks the point in time at which the rear end of a first printed sheet 3 leaves the area of the suction roll 5 .
  • point A 16 marks the point in time at which the rear end of a first printed sheet 3 leaves the area of the suction roll 5 .
  • valve 1 is closed immediately after the start of the inflow of ambient air at point B 17 .
  • the vacuum of the system which is now sealed off from the environment, rises again rapidly until it assumes the maximum value 13 that can be technically achieved by the vacuum generator 12 .
  • a part of the negative pressure generated in the time after point B 17 is thus stored.
  • the control signal for opening the valve 1 is given by the control unit, not shown, which determines the current sheet position on the basis of the signals it receives.
  • the control device controls the valve 1 as a function of the movement of the gripper carriage 2 and the format length.
  • the valve 1 When the leading edge of the printing sheet 3 has passed the suction roll 5 , the valve 1 is opened at point C 18 .
  • the vacuum stored in the vacuum lines 10 thus also spreads to the surface of the suction roll.
  • the valve can be opened when the middle or the last third of the format length of the printing sheet 3 is above the suction roller 5 .
  • Point D 19 marks this starting point. With the start, the openings of the suction roller 5 are closed and, due to the suction power of the vacuum generator 1 , the vacuum inside the system rises until the maximum vacuum value 13 that can be achieved is reached again at point E 20.
  • the maximum negative pressure value 13 is reached again very quickly, in particular because the negative pressure had not previously collapsed in the entire system and there was a much higher outlet pressure than in the solution according to the prior art.
  • the speed of the rise can vary depending on the type of sheet brake 5 used . It is also possible that instead of the maximum negative pressure value, only a negative pressure value that is very close to this is achieved. In the further course of time, the negative pressure curve for the next printing sheet 3 is shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP02023699A 2001-11-21 2002-10-23 Méthode et appareil pour freiner des feuilles Withdrawn EP1314670A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10157118A DE10157118A1 (de) 2001-11-21 2001-11-21 Verfahren und Vorrichtung zum Abbremsen von Druckbögen
DE10157118 2001-11-21

Publications (1)

Publication Number Publication Date
EP1314670A1 true EP1314670A1 (fr) 2003-05-28

Family

ID=7706455

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02023699A Withdrawn EP1314670A1 (fr) 2001-11-21 2002-10-23 Méthode et appareil pour freiner des feuilles

Country Status (2)

Country Link
EP (1) EP1314670A1 (fr)
DE (1) DE10157118A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006035693A1 (de) 2006-07-28 2008-02-07 Heidelberger Druckmaschinen Ag Bogenbremsensystem zum Bremsen von Druckbogen
DE102007063763B3 (de) * 2007-07-23 2016-02-04 Océ Printing Systems GmbH & Co. KG Puffervorrichtungen für die Zufuhr einer Bedruckstoffbahn zu einer Druckeinrichtung
DE102007034246B4 (de) * 2007-07-23 2010-10-28 OCé PRINTING SYSTEMS GMBH Einrichtung mit einer Vorzentriervorrichtung und einer Puffervorrichtung für die Zufuhr einer Bedruckstoffbahn zu einer Druckeinrichtung
DE102010049161A1 (de) * 2010-10-22 2012-04-26 Bielomatik Leuze Gmbh + Co. Kg Vorrichtung zum Abbremsen von Bögen
DE102011115297A1 (de) * 2011-09-29 2013-04-04 Robert Nyblad Gmbh Saugbremsvorrichtung sowie dazugehöriges Steuerverfahren
EP3013722B1 (fr) 2013-12-04 2020-03-18 Koenig & Bauer AG Procédé de réglage d'au moins un élément de freinage d'un frein de feuilles et utilisation d'une partie non imprimée d'une matière à imprimer pour effectuer une décélération de la matière à imprimer
CN107567385B (zh) 2015-04-30 2020-12-01 柯尼格及包尔公开股份有限公司 用于依次加工单张纸状基材的方法和机器结构
DE102016207404A1 (de) 2015-07-17 2017-01-19 Koenig & Bauer Ag Transportvorrichtung zum sequentiellen Transport einzelner bogenförmiger Substrate
DE102015213432B4 (de) 2015-07-17 2021-02-25 Koenig & Bauer Ag Maschinenanordnung zum sequentiellen Transport einzelner bogenförmiger Substrate jeweils mit einem entlang einer Bewegungsbahn bewegten Greiferwagen
DE102015213429B4 (de) 2015-07-17 2021-03-04 Koenig & Bauer Ag Transportvorrichtung zum sequentiellen Transport einzelner bogenförmiger Substrate
DE102015216877B4 (de) 2015-09-03 2021-06-17 Koenig & Bauer Ag Verfahren zum sequentiellen Zuführen mehrerer Bogen zu einer diese Bogen jeweils bearbeitenden Bearbeitungsstation
DE102015216871B4 (de) 2015-09-03 2021-10-28 Koenig & Bauer Ag Maschinenanordnung zum sequentiellen Bearbeiten mehrerer bogenförmiger jeweils eine Vorderseite und eine Rückseite aufweisender Substrate
DE102016207409B4 (de) 2015-09-03 2021-08-19 Koenig & Bauer Ag Verfahren zum Betrieb einer Vorrichtung zum Transport bogenförmiger Substrate
DE102015017160B4 (de) 2015-09-03 2024-01-04 Koenig & Bauer Ag Maschinenanordnung mit mehreren Bearbeitungsstationen zum sequentiellen Bearbeiten mehrerer bogenförmiger Substrate
DE102015216875B4 (de) 2015-09-03 2018-09-20 Koenig & Bauer Ag Verfahren zum Betrieb einer mehrere Bogen einer Bearbeitungsstation sequentiell zuführenden Transportvorrichtung
DE102015216873B4 (de) 2015-09-03 2021-10-28 Koenig & Bauer Ag Verfahren zum Betrieb einer einzelne bogenförmige Substrate einer Bearbeitungsstation sequentiell zuführenden Transportvorrichtung
DE102015216870B4 (de) 2015-09-03 2020-08-13 Koenig & Bauer Ag Maschinenanordnung mit mehreren Bearbeitungsstationen zum sequentiellen Bearbeiten mehrerer bogenförmiger Substrate
DE102016207398B3 (de) * 2015-09-09 2016-08-18 Koenig & Bauer Ag Maschinenanordnung zum sequentiellen Bearbeiten mehrerer bogenförmiger jeweils eine Vorderseite und eine Rückseite aufweisender Substrate
DE102016207397A1 (de) 2016-04-29 2017-11-02 Koenig & Bauer Ag Vorrichtung zum Unterschuppen von Bogen
DE102016215792B4 (de) 2016-08-23 2020-07-16 Koenig & Bauer Ag Maschinenanordnung zum sequentiellen Bearbeiten mehrerer bogenförmiger jeweils eine Vorderseite und eine Rückseite aufweisender Substrate

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201480A1 (de) * 1992-01-21 1993-07-22 Heidelberger Druckmasch Ag Einrichtung zum ablegen von bedruckten bogen auf einen stapel
DE4343713A1 (de) * 1993-12-21 1995-06-22 Heinen Elektronik Gmbh Ablage für von einer Transportanlage zwangsgeführte, in Reihe ankommende Bögen
DE4422199A1 (de) * 1994-06-24 1996-01-04 Gremser Masch Franz Vorrichtung zum Ablegen von Bogen
US5569016A (en) * 1994-09-23 1996-10-29 Ltg Lufttechnische Gesellschaft M.B.H. Multiple conveyor stacking apparatus
US5582400A (en) * 1993-08-24 1996-12-10 Heidelberger Druckmaschinen Device for conveying sheets to a sheet pile
DE19643588C1 (de) * 1996-10-22 1997-10-23 Roland Man Druckmasch Bogenbremsvorrichtung im Ausleger einer Druckmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944857C (de) * 1953-02-04 1956-06-28 Maschf Augsburg Nuernberg Ag Vorrichtung zum Bogenablegen, insbesondere bei Druckmaschinen
DE3413179C2 (de) * 1984-04-07 1995-02-23 Roland Man Druckmasch Steuer- und Regelvorrichtung eines Bogenauslegers für bogenverarbeitende Maschinen, insbesondere für Bogendruckmaschinen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201480A1 (de) * 1992-01-21 1993-07-22 Heidelberger Druckmasch Ag Einrichtung zum ablegen von bedruckten bogen auf einen stapel
US5582400A (en) * 1993-08-24 1996-12-10 Heidelberger Druckmaschinen Device for conveying sheets to a sheet pile
DE4343713A1 (de) * 1993-12-21 1995-06-22 Heinen Elektronik Gmbh Ablage für von einer Transportanlage zwangsgeführte, in Reihe ankommende Bögen
DE4422199A1 (de) * 1994-06-24 1996-01-04 Gremser Masch Franz Vorrichtung zum Ablegen von Bogen
US5569016A (en) * 1994-09-23 1996-10-29 Ltg Lufttechnische Gesellschaft M.B.H. Multiple conveyor stacking apparatus
DE19643588C1 (de) * 1996-10-22 1997-10-23 Roland Man Druckmasch Bogenbremsvorrichtung im Ausleger einer Druckmaschine

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Publication number Publication date
DE10157118A1 (de) 2003-05-28

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