EP1120250B1 - Système de transport pour une machine à imprimer - Google Patents

Système de transport pour une machine à imprimer Download PDF

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Publication number
EP1120250B1
EP1120250B1 EP00127029A EP00127029A EP1120250B1 EP 1120250 B1 EP1120250 B1 EP 1120250B1 EP 00127029 A EP00127029 A EP 00127029A EP 00127029 A EP00127029 A EP 00127029A EP 1120250 B1 EP1120250 B1 EP 1120250B1
Authority
EP
European Patent Office
Prior art keywords
guide surface
printing material
printing
transport system
sensor
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.)
Expired - Lifetime
Application number
EP00127029A
Other languages
German (de)
English (en)
Other versions
EP1120250A3 (fr
EP1120250A2 (fr
Inventor
Andreas Henn
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen 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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP1120250A2 publication Critical patent/EP1120250A2/fr
Publication of EP1120250A3 publication Critical patent/EP1120250A3/fr
Application granted granted Critical
Publication of EP1120250B1 publication Critical patent/EP1120250B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F22/00—Means preventing smudging of machine parts or printed articles

Definitions

  • the present invention relates to a printing material transport system for a printing press, as shown in DE-A-197 30 042 known.
  • Such transport systems are used to convey a substrate, in particular individual sheets of a substrate, from a printing unit of a multicolor printing press to the next, to turn double-sided to be printed sheets, or store finished printed sheets.
  • An apparatus for controlling a sheet guide in a sheet-fed press contains a cylinder with a lateral surface, actuators for blowing air and a distance sensor.
  • the lateral surface is closed, wherein the blowing air and the distance sensor are arranged outside the cylinder and are directed to a sheet which rests on the lateral surface.
  • a printing material transport system for a printing machine with at least one Bedruckstoffleit Structure and means for generating an air cushion between the guide surface and the printing material is proposed, which has the features of claim 1.
  • Advantageous embodiments emerge from the subclaims.
  • the guide surface can be designed in sheet form in the form of sheets and plates, wherein the guide surface for the pneumatic distance control of a sheet blowing and / or Saugluftötechnischen.
  • the air cushion or supporting air cushion may also be between ironing or pipes, wherein the narrow in relation to the arc surface surfaces are part of said guide surface.
  • the sensor arrangement comprises a capacitive sensor arranged on the guide surface.
  • a capacitive sensor arranged on the guide surface.
  • Such a sensor should be as small as possible, in particular as flat as possible, so that it can be arranged on the guide surface without disturbing the transport of the substrate.
  • Such a sensor can essentially be made up of thin metallic and insulating foils glued onto the guide surface.
  • the senor preferably has a measuring electrode and a shielding electrode surrounding the measuring electrode and insulated therefrom.
  • These electrodes can each be acted upon by a control circuit with AC signals, wherein the phase and amplitude of the two AC signals relative to each other are controlled by the control circuit so that the electric field of the measuring electrode is up to a typical measurement distance substantially perpendicular to the measuring electrode.
  • a substantially constant from the measuring electrode to the measuring location strength of the electric field and consequently a linear characteristic of the sensor is ensured.
  • gripper bridges which extend substantially across the width of the printing press, hold a sheet to be conveyed at its leading edge and pull behind him.
  • a timing circuit which receives a synchronization signal coupled to the printing cycle of the printing press and ensures that no distance detection takes place if any Gripper bridge is located in the detection range of the sensor.
  • Transfer drums 1,2 take over a sheet to be printed from an upstream printing unit and pass it to a counter-pressure cylinder 3. On this the sheet passes through a gap between impression cylinder 3 and blanket cylinder 4, in which it is printed and then transferred to a transport system, the majority comprises guided on endless chains 5 gripper bars 6.
  • the chains 5 run in Figure 1 clockwise, and transport printed sheets each on its underside hanging to a delivery stack 8.
  • a working with infrared or UV radiation dryer 7 is arranged on the transport system so that its radiation on the last printed Top of each bow drops.
  • a Bescherstoffleit Structure 10 is arranged in the form of a sheet-metal equipped with nozzles on the lower strand of the chains 5, which prevents uncontrolled dropping a sheet down.
  • the nozzle-forming perforations of the guide surface 10 open onto compressed air boxes 11, of which two are present in the system shown in FIG. These are supplied by a pump 12 via control valves 13 with compressed air.
  • the degree of opening of the control valves 13 can be controlled by an electronic control circuit, which is not shown in Figure 1 and whose operation will be discussed later.
  • FIG. 2 shows in detail a section of the guide surface 10.
  • the guide surface 10 consists of a flat sheet with perforations formed therein 9 (transport nozzles), which open onto a mounted under the guide surface compressed air box 11.
  • the three formed of a metal foil, mutually insulated, concentric electrodes 14,15,16 carries.
  • the innermost of the three electrodes represents a measuring electrode 14. It is in each case annularly surrounded by the shield electrode 15 and the ground electrode 16.
  • other shapes such as B. rectangular shapes, can be used.
  • the thickness of the electrodes is only a few micrometers.
  • the three electrodes 14, 15, 16 are each connected to outputs of a control circuit 17 via plated-through holes 21 insulated against the guide surface 10, which is mounted on a printed circuit board 18 on the underside of the guide surface 10 within the compressed air box 11.
  • the shield electrode 15 is provided.
  • the two electrodes are each acted upon by the control circuit 17 with two alternating voltage signals, which are largely identical in amplitude and phase.
  • the earth electrode 16, which surrounds the shield electrode 15 in a ring-shaped manner as shown in FIG. 2, can also be dispensed with if the electrically conductive guide surface 10 is held at ground potential in its place.
  • the control circuit generates a first AC signal by impressing an alternating current of predetermined magnitude and frequency to the measuring electrode 14.
  • the voltage amplitude of this signal is proportional to the reactance Xc of the plate capacitor.
  • A is the area of the measuring electrode 14.
  • a second AC voltage signal applied to the shield electrode 15 is generated by the control circuit 17 by means of a voltage follower from the first AC signal.
  • the measured AC voltage amplitude is compared in the control circuit 17 with a limit value. If the limit is exceeded, this means that the sheet 19 of the guide surface 10 is closer than allowed. In such a case, controlled by the control circuit 17, the power of the pump 12 or the opening degree of the respective compressed air box supplying valve 13 is increased to the air cushion formed by the exiting from the perforations 9 compressed air cushion between the guide surface 10 and the sheet 19 reinforce and thus bring it to a greater distance. Conversely, the thickness of the air bag is reduced when the measured distance exceeds a second limit.
  • the arrangement is designed as a two-point control system, that is, the measured value is compared with a limit value. If the limit is reached or exceeded, the air cushion is increased or decreased accordingly.
  • a controller with a predetermined setpoint. This represents a particularly high-quality solution.
  • a setpoint the distance X of the arch 19 from the guide surface 10 is defined.
  • the deviation from the setpoint position is determined as ⁇ ⁇ X.
  • the actuator of the controller is preferably adjusted in proportion to the deviation ⁇ ⁇ X.
  • control circuit 17 may impress an AC voltage of predetermined frequency and amplitude and measure the magnitude of the resulting AC current. Decisive for the detection is that values of the voltage and current, either given or measured, are present, which allow the conclusion on the reactance of the capacitor.
  • the senor of Figure 2 is essentially composed of only two layers of thin films and therefore has a thickness in the range of millimeter fractions, it does not appreciably affect the air flow ratios between the guide surface and a sheet 19 transported above. Such a sensor arrangement can therefore also be retrofitted into already existing transport systems for printing machines without difficulty.
  • control circuit 17 is coupled to an angle encoder, which is connected to any, synchronous to the machine cycle drum the printing press can be mounted and the control circuit 17 provides a synchronization signal.
  • This allows the control circuit 17 to inhibit the recording of distance measured values whenever a gripper bridge 6 passes the sensor, which would falsify the measurement results.
  • the measured value recording can be suppressed if no sheet 19 is in front of the sensor.
  • the control circuit 17 in addition to the synchronization signal information about the length of each processed sheet 19 receives. This temporary suppression of the measured value recording facilitates subsequent processing of the measured values; in particular a characteristic value formation z.
  • B. low-pass filtering from the digestion over the average distance between the printing material sheet 19 and guide surface 10 can be obtained.
  • Sensor arrangements of the type described with reference to Figure 2 may be provided in a transport system of a printing press at various locations to locally regulate the thickness of the air cushion there. They can be used not only on the boom, as shown in Figure 1, but also during transport of the printing material between two printing units of a machine, or in the sheet turner a printing press.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Discharge By Other Means (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Rotary Presses (AREA)

Claims (5)

  1. Système de transport d'un produit d'impression pour une machine à imprimer, comportant au moins une surface de guidage du produit d'impression et des moyens destinés à générer un matelas d'air entre la surface de guidage (10) et le produit d'impression (19), comportant au moins un système de détection, destiné à détecter la distance entre le produit d'impression (19) et la surface de guidage (10), et des moyens de commande (17) qui sont aptes à commander l'épaisseur du matelas d'air à l'appui de la distance détectée, de telle sorte que la distance détectée par le système de détection est située dans une plage de valeurs de consigne, caractérisé en ce que les moyens destinés à générer le matelas d'air comportent une source de surpression (12) et des orifices de sortie d'air (9), réalisés sur la surface de guidage (10) et raccordés à la source de surpression (12), en ce que le système de détection comporte un capteur (14-18, 20) capacitif, disposé sur la surface de guidage (10).
  2. Système de transport d'un produit d'impression selon la revendication 1, caractérisé en ce que le capteur est réalisé dans une feuille (20) métallique et isolante.
  3. Système de transport d'un produit d'impression selon la revendication 1, caractérisé en ce que le capteur, dans un agencement plan, comporte une électrode de mesure (14) et une électrode d'isolation (15) entourant l'électrode de mesure (14) et isolée par rapport à celle-ci.
  4. Système de transport d'un produit d'impression selon la revendication 3, caractérisé en ce que le système de détection comporte un circuit de commande (17) destiné à solliciter l'électrode de mesure (14) avec un premier signal de tension alternative et destiné à détecter la réactance d'un condensateur formé par l'électrode de mesure (14) et le produit d'impression (19) situé en face de l'électrode de mesure (14).
  5. Système de transport d'un produit d'impression selon l'une quelconque des revendications précédentes, caractérisé en ce que le système de détection (14-18, 20) comporte un circuit de commande du temps (17), qui est réalisé de telle sorte qu'il reçoit un signal de synchronisation couplé au cycle de travail de la machine à imprimer et garantit que la distance entre le produit d'impression (19) et la surface de guidage (10) est détectée seulement pendant une partie de chacun des cycles de la machine à imprimer.
EP00127029A 2000-01-27 2000-12-09 Système de transport pour une machine à imprimer Expired - Lifetime EP1120250B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10003352A DE10003352A1 (de) 2000-01-27 2000-01-27 Transportsystem für eine Druckmaschine
DE10003352 2000-01-27

Publications (3)

Publication Number Publication Date
EP1120250A2 EP1120250A2 (fr) 2001-08-01
EP1120250A3 EP1120250A3 (fr) 2002-05-22
EP1120250B1 true EP1120250B1 (fr) 2007-06-13

Family

ID=7628802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00127029A Expired - Lifetime EP1120250B1 (fr) 2000-01-27 2000-12-09 Système de transport pour une machine à imprimer

Country Status (5)

Country Link
US (1) US20010018871A1 (fr)
EP (1) EP1120250B1 (fr)
JP (1) JP2001240283A (fr)
AT (1) ATE364504T1 (fr)
DE (2) DE10003352A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10151423B4 (de) * 2000-10-26 2014-07-24 Heidelberger Druckmaschinen Ag Vorrichtung zur Einstellung eines einen Bogentransport beeinflussenden Luftstroms in einer Druckmaschine, und entsprechendes Verfahren
JP2006168994A (ja) * 2004-12-16 2006-06-29 Heidelberger Druckmas Ag 印刷技術的な機械を通って搬送する際にガイドに対するシートの間隔を調節するための装置
JP2006175862A (ja) 2004-12-21 2006-07-06 Heidelberger Druckmas Ag 枚葉紙を、印刷技術機械内を周期的に搬送する方法
DE102005056544B4 (de) * 2004-12-21 2016-06-02 Heidelberger Druckmaschinen Ag Verfahren zur zyklischen Förderung von Bogen durch eine drucktechnische Maschine
DE102005024992B4 (de) * 2005-06-01 2007-02-08 Heidelberger Druckmaschinen Ag Verfahren und Vorrichtung zum Fördern eines Bogens durch eine drucktechnische Maschine
CN1944048A (zh) 2005-09-21 2007-04-11 海德堡印刷机械股份公司 用于输送页张的方法和用于执行该方法的装置
DE102006037248B4 (de) * 2006-08-09 2021-01-14 manroland sheetfed GmbH Falschbogensensor einer Druckbogen verarbeitenden Maschine
DE102010003046A1 (de) * 2010-03-19 2011-09-22 Koenig & Bauer Aktiengesellschaft Vorrichtung und Verfahren zum Führen eines Bogens unter Inline-Messsystemen
DE102011003962A1 (de) * 2011-02-11 2012-08-16 manroland sheetfed GmbH Bogentransportvorrichtung in einer Verarbeitungsmaschine und Verfahren zum Führen von Bogenmaterial

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1449656C3 (de) * 1961-12-02 1972-06-29 Svenska Flaektfabriken Ab Vorrichtung zum flatterfreien Führen von Flachmaterial
DE3411029A1 (de) * 1984-03-24 1985-10-03 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum fuehren von ein- und beidseitig bedruckten bogen
CH685214A5 (fr) * 1991-10-15 1995-04-28 Hans Ulrich Meyer Capteur capacitif de position.
DE4328445B4 (de) * 1993-08-24 2004-03-04 Heidelberger Druckmaschinen Ag Vorrichtung zum Fördern von Bogen auf einen Stapel
JP3442871B2 (ja) * 1994-07-19 2003-09-02 インタクト株式会社 静電容量計を用いた厚みまたは変位測定装置、および静電容量計を用いた厚みまたは変位測定方法
DE19537954C1 (de) * 1995-10-12 1997-01-16 Leuze Electronic Gmbh & Co Vorrichtung zur Kontrolle von Bögen
JPH10330003A (ja) * 1997-05-30 1998-12-15 Kawasaki Steel Corp 帯状材の非接触移送装置
DE19730042C2 (de) * 1997-07-14 2003-06-12 Roland Man Druckmasch Vorrichtung zur Steuerung einer Bogenführung in einer Bogendruckmaschine
EP0899228B1 (fr) * 1997-08-28 2004-04-14 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif de guidage à coussin d'air

Also Published As

Publication number Publication date
DE10003352A1 (de) 2001-08-02
ATE364504T1 (de) 2007-07-15
US20010018871A1 (en) 2001-09-06
EP1120250A3 (fr) 2002-05-22
DE50014408D1 (de) 2007-07-26
JP2001240283A (ja) 2001-09-04
EP1120250A2 (fr) 2001-08-01

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