EP1719621B1 - Système de nettoyage pour les surfaces des cylindres d'une machine d'impression - Google Patents

Système de nettoyage pour les surfaces des cylindres d'une machine d'impression Download PDF

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Publication number
EP1719621B1
EP1719621B1 EP05009570A EP05009570A EP1719621B1 EP 1719621 B1 EP1719621 B1 EP 1719621B1 EP 05009570 A EP05009570 A EP 05009570A EP 05009570 A EP05009570 A EP 05009570A EP 1719621 B1 EP1719621 B1 EP 1719621B1
Authority
EP
European Patent Office
Prior art keywords
cleaning system
piston
cleaning
volumetric flow
printing
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.)
Not-in-force
Application number
EP05009570A
Other languages
German (de)
English (en)
Other versions
EP1719621A1 (fr
Inventor
Kjell Lundin
Thomas Riedl
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.)
Baldwin Oxy Dry GmbH
Original Assignee
Baldwin Oxy Dry 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 Baldwin Oxy Dry GmbH filed Critical Baldwin Oxy Dry GmbH
Priority to EP05009570A priority Critical patent/EP1719621B1/fr
Priority to DE502005007747T priority patent/DE502005007747D1/de
Priority to US11/409,664 priority patent/US7530307B2/en
Publication of EP1719621A1 publication Critical patent/EP1719621A1/fr
Application granted granted Critical
Publication of EP1719621B1 publication Critical patent/EP1719621B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/26—Spraying devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2251/00—Details or accessories of printing machines not otherwise provided for
    • B41P2251/10—Pumps

Definitions

  • the invention relates to a cleaning system for cylinder surfaces of a printing press according to the preamble of claim 1.
  • the present cleaning system comprises a number of automated cleaning devices, each associated with one or more cylinders.
  • the cleaning devices are each provided with a supply line for the supply of washing liquids.
  • the supply lines receive the washing liquids from a common delivery line, which is associated with at least one delivery device, usually a pump.
  • the mentioned printing machines have in common that an intensive contact between the printing substrate and the cylinders is necessary for the guidance, for the processing and for the drive of printing material sheets or printing material webs.
  • an intensive contact between the printing substrate and the cylinders is necessary for the guidance, for the processing and for the drive of printing material sheets or printing material webs.
  • deposits of paper dust (fibers, coating, fillers, etc.) are formed on the cylinders.
  • These deposits affect the cylinders in their functionality. For example, deposits on blanket cylinders in offset printing cause that the dot sharpness of the print is lost and some print lots do not print correctly.
  • it is essential that the mentioned cylinders are regularly cleaned of impurities.
  • a cleaning system for cylinder surfaces of a printing machine with automated cleaning devices is disclosed.
  • Supply lines for the cleaning devices branch off from a common delivery line in order to be able to supply this washing liquid.
  • Assigned to the delivery line is designed as a piston-cylinder unit conveying device, wherein the piston stroke can be detected.
  • temporary storage for the washing liquids are provided.
  • printing inks are used, which have to be dried after printing, so that the corresponding printing presses are provided with a dryer, through which the printing material is guided after printing.
  • the drying takes place at elevated temperatures, which emphasizes safety aspects:
  • the printing inks have volatile hydrocarbon fractions, which can reach an ignitable concentration in the dryer under unfavorable conditions during evaporation. Accordingly, the heat exposure in the dryer and the production speed, which has an influence on the residence time of the printing substrate between the printing process and the drying process, must be set so that the hydrocarbon concentration in the dryer in any case below a limit, for. B. below 25% of the lower explosion limit.
  • the paper web transports washing liquids into the dryer during the cleaning process.
  • the washing liquids commonly used have a relatively high proportion of volatile hydrocarbons, so that care must be taken here that the hydrocarbon concentration in the dryer is not too high. It Do not use too much washing liquid during the cleaning process.
  • the amount of washing liquid that is used for cleaning should be kept as low as possible, otherwise too much hydrocarbon-containing washing liquid gets into the dryer and there causes the risk of an excessive hydrocarbon concentration.
  • the time for the cleaning process should be kept as short as possible. It is therefore necessary to optimize the use of washing liquid insofar that the best possible cleaning effect is achieved with the shortest possible cleaning time with the least possible use of detergent.
  • the present invention is therefore based on the object to improve a cleaning system for cylinder surfaces of a printing machine of the type mentioned so that the applied during the cleaning process amount of washing liquids can be reliably and insensitive to interference monitored.
  • a piston-cylinder unit is used whose piston stroke is monitored by a detection device. According to the invention, therefore, the fact is used that the total amount of washing liquids, which is taken in a time interval from the substrate in the dryer, in any case, is smaller than the total amount of washing liquids, which is supplied to the cleaning system with its cleaning devices in this time interval.
  • the limit value itself then depends on the conditions on site, for example, how many cleaning devices are arranged where and how fast the press runs during the cleaning process, and of course, how high the concentration of hydrocarbons in the respective dryer may be.
  • the present invention not only uses this principle, but makes this use fail-safe by a piston-cylinder unit is used as a pump or pump and not by directly measuring the flow of the washing liquids, but a Wegüberwachung the piston stroke of the piston Cylinder unit is done.
  • This path monitoring has the great advantage that it is insensitive to any fluctuations in the viscosity of the washing liquids - in contrast to an optical flow meter - and that any admixtures of air can falsify the measurement at most in the direction of a measured flow too large. This is acceptable in terms of security requirements.
  • a stroke monitoring of the piston stroke is also particularly easy, for example by means of a displacement measuring device, which is associated with the piston rod.
  • a displacement measuring device which is associated with the piston rod.
  • the detection device can be designed such that a displacement measuring device is attached to the piston-cylinder unit, whose signals are given to the control of the cleaning system.
  • the control of the cleaning system is part of the detection device according to the invention, since it processes the signals received from the displacement encoder and outputs for further processing to the actual control circuit.
  • the necessary calculations can be made by a software module that is integrated into the control system of the cleaning system.
  • a volumetric flow meter may additionally be attached to the delivery line, although due to its higher sensitivity to disturbances, a higher value of throughflow volume should be set as the limit value, so that the volumetric flow rate Measuring switch is only intended to further increase safety as an emergency shutdown with single-fault safety. For this purpose, it can interrupt the function of the cleaning system, for example by deenergizing the control and the valves upon reaching a volume flow limit.
  • the conveying device is then primarily a pump for maintaining an overpressure, and only secondarily is their task the supply of washing liquids in the system.
  • the maintenance of the pressure in the supply lines can be done via a pressure accumulator, which is assigned to the supply lines, or the supply lines can themselves serve as a pressure accumulator by being elastic and reduce their volume elastically when removing washing liquid during a pulse.
  • attaching the switchable shut-off valves in the immediate vicinity of the cleaning device allows much shorter pulses and much higher pulse frequencies than if, for example, the conveying device were operated pulsed. With shorter pulses and higher frequencies can be achieved that not at the beginning of the pulse more washing liquid is applied to the corresponding parts of the cleaning device, as it is necessary at this time, while at the end of the pulse possibly still too little washing liquid is applied.
  • the detection device calculates, based on the detected measured values of the piston stroke, the average speed of the piston movement at specific time intervals, which expediently depends on the pulse lengths and the pulse frequency and on the duration of the cleaning cycle depend on a given upper limit. Because the average speed of the piston movement is proportional to the amount of washing liquid, which is conveyed into the system. If the upper limit for the average speed of the piston movement is reached or even exceeded, this means that a certain amount of washing liquid was conveyed into the system within a certain time interval and insofar as the same amount of washing liquid was processed in the cleaning device. In the worst case, the entire amount of washing liquid was transported with the substrate in the dryer. The result of the comparison of the average velocity of the piston movement with the predetermined upper limit value is then further processed in the control of the cleaning system in order, if necessary, to initiate a safety shutdown or an automatic reduction of the wash fluid application.
  • the detection device determines the predetermined upper limit for the average speed of the piston movement as a function of the average production speed of the printing press in the corresponding time interval. However, this can also be done manually.
  • the single figure shows schematically the structure of an embodiment of an inventive cleaning system.
  • the printing press or the cylinders of the printing press to be cleaned are not shown.
  • the schematically illustrated cleaning system consists of three cleaning devices 1, 1 ', 1 "with spray nozzles 2 for applying washing liquids 3 to the respective cylinder to be cleaned, each one the cleaning devices 1, 1 ', 1 "associated supply line 4, 4', 4" and these supply lines 4, 4 ', 4 "common delivery line 5.
  • the ein.er suction lance 6 with check valve 7 ends in a tank 8 for washing liquid 3 sits a piston-cylinder unit 9 as a pump for pressurizing the delivery line 5 and in cooperation with the check valve 7 for conveying the washing liquid 3 in the delivery line 5.
  • Die Piston-cylinder unit 9 consists of a hydraulic side 10 in which a first piston 11 pressurizes the washing liquid 3.
  • a piston rod 12 connects the first piston 11 on the hydraulic side 10 with a second piston 13 on a pneumatic side 14.
  • the pneumatic side 14 of the piston-cylinder unit 9 is designed as a double-acting pneumatic cylinder and is betä via leads 15, 15 'by means of compressed air Untitled.
  • Switchable shut-off valves 16, 16 ', 16 are located in the delivery lines 4, 4', 4" in order to allow washing liquid 3 to pass from the supply line 4 to the spray nozzles 2 of the cleaning devices 1.
  • These check valves 16 are arranged in the immediate vicinity of the spray nozzles 2 of the cleaning devices 1 and are opened and closed very quickly to produce a pulsed operation of the spray nozzles 2.
  • the piston rod 12 of the piston-cylinder unit 9 runs along a stator 17 of a position measuring device whose movable part 18 is arranged in the second piston 13.
  • This displacement measuring device 17, 18 thus measures the movement of the first piston 11 or its path traveled, wherein it is arranged on the pneumatic side 14 of the piston-cylinder unit 9 and thus receives no contact with the washing liquid 3.
  • the washing liquid 3 can not falsify the corresponding measurement.
  • the displacement meter 17, 18 is connected to a controller 19 of the cleaning system and acts in the manner according to the invention on this.
  • a control output 22 which is assigned to a voltage source 24, even if, for better clarity, corresponding connecting lines are illustrated only for the first check valve 16.
  • the contact 23 in this volume flow measuring switch 20 is a reed switch which, as indicated by the power lines 21, the blocking elements 16, 16 ', 16 "de-energized switches as soon as the flow of washing liquids 3 through the flow measuring switch 20 exceeds a preset volume flow limit. The cleaning system shown is then so switched without function and then exits the spray nozzles 2 no washing liquid 3 more.
  • the volume flow measuring switch 20 is, however, only a subsidiary safety device and thus a redundant system, since the displacement monitoring of the piston stroke of the piston-cylinder unit 9 according to the invention already provides the required safety via the displacement measuring device 17, 18.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (7)

  1. Système de nettoyage destiné à des surfaces de cylindres d'une machine d'impression, comprenant un certain nombre de dispositifs de nettoyage (1, 1', 1") automatisés, respectivement dédiés à un ou plusieurs cylindre(s) et munis d'un conduit respectif d'alimentation (4, 4', 4") pour l'amenée de fluides de lavage (3) ; ainsi qu'un conduit commun de refoulement (5) affecté aux conduits d'alimentation (4) et associé à au moins un dispositif refouleur assigné audit conduit de refoulement (5), ledit dispositif refouleur étant un vérin (9) auquel un système de détection (17, 18, 19) est associé en vue de surveiller la course du piston,
    caractérisé par le fait
    que le système de détection (17, 18, 19) est agencé de telle sorte qu'il calcule la vitesse moyenne du mouvement du piston à intervalles de temps déterminés, sur la base des valeurs mesurées détectées propres à la course dudit piston ; compare ladite vitesse à une valeur limite supérieure préétablie ; et délivre le résultat de la comparaison, en vue du traitement ultérieur.
  2. Système de nettoyage selon la revendication 1,
    caractérisé par le fait
    que le système de détection (17, 18, 19) englobe un appareil (17, 18) mesureur de courses, associé à la tige (12) du piston.
  3. Système de nettoyage selon l'une des revendications 1 ou 2,
    caractérisé par le fait
    qu'un commutateur (20) de mesure de débit volumétrique est implanté sur le conduit de refoulement (5), en aval du dispositif refouleur (9).
  4. Système de nettoyage selon la revendication 3,
    caractérisé par le fait
    que le commutateur (20) de mesure de débit volumétrique est agencé de façon telle qu'il compare le débit volumétrique détecté à une valeur limite de débit volumétrique, et interrompe le fonctionnement dudit système de nettoyage lorsque ladite valeur est atteinte ou outrepassée.
  5. Système de nettoyage selon au moins l'une des revendications 1 à 4,
    caractérisé par le fait
    que les conduits d'alimentation (4), et/ou les dispositifs de nettoyage (1), sont munis de robinets d'isolement (16) commutables.
  6. Système de nettoyage selon la revendication 5,
    caractérisé par le fait
    que les conduits d'alimentation (4) sont reliés à un accumulateur de pression, et/ou sont de réalisation élastique à effet d'accumulation de pression.
  7. Système de nettoyage selon au moins l'une des revendications 1 à 6,
    caractérisé par le fait
    que le système de détection (17, 18, 19) est, en outre, agencé de manière à établir fermement la valeur limite supérieure préétablie, durant l'intervalle de temps correspondant, en fonction de la vitesse moyenne de la machine d'impression.
EP05009570A 2005-05-02 2005-05-02 Système de nettoyage pour les surfaces des cylindres d'une machine d'impression Not-in-force EP1719621B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05009570A EP1719621B1 (fr) 2005-05-02 2005-05-02 Système de nettoyage pour les surfaces des cylindres d'une machine d'impression
DE502005007747T DE502005007747D1 (de) 2005-05-02 2005-05-02 Reinigungssystem für Zylinderoberflächen einer Druckmaschine
US11/409,664 US7530307B2 (en) 2005-05-02 2006-04-24 Cleaning system for cylinder surfaces of a printing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05009570A EP1719621B1 (fr) 2005-05-02 2005-05-02 Système de nettoyage pour les surfaces des cylindres d'une machine d'impression

Publications (2)

Publication Number Publication Date
EP1719621A1 EP1719621A1 (fr) 2006-11-08
EP1719621B1 true EP1719621B1 (fr) 2009-07-22

Family

ID=35124659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05009570A Not-in-force EP1719621B1 (fr) 2005-05-02 2005-05-02 Système de nettoyage pour les surfaces des cylindres d'une machine d'impression

Country Status (3)

Country Link
US (1) US7530307B2 (fr)
EP (1) EP1719621B1 (fr)
DE (1) DE502005007747D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005042300A1 (de) * 2005-09-06 2007-03-08 Baldwin Germany Gmbh Druckmaschinenreinigungsvorrichtung, Flüssigkeitssystem und Verteilerventil dafür
DE102005057752A1 (de) * 2005-12-02 2007-06-06 Bosch Rexroth Ag Farbdosiereinrichtung
DE102007030827B4 (de) 2007-07-03 2010-08-12 Technotrans Ag Vorrichtung zur Bereitstellung von Waschfluiden an Druckmaschinen
DE102008024960A1 (de) * 2008-05-23 2009-11-26 Manroland Ag Versorgungseinrichtung einer Reinigungsvorrichtung einer Druckmaschine
DE102012014336A1 (de) * 2012-07-19 2013-11-14 Technotrans Ag Fördersystem zum Fördern eines Schmiermittels einer Blechtiefziehmaschine und korrespondierendes Verfahren

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913797A (en) * 1974-02-11 1975-10-21 Baldwin Gegenheimer Corp Fluid dispensing system
US4419880A (en) * 1980-03-28 1983-12-13 Rockwell International Corporation Apparatus for calibrating fluid flow meters utilizing digital techniques
US5388965A (en) * 1990-10-10 1995-02-14 Friedrich Wilhelm Schwing Gmbh Sludge pump with monitoring system
FR2539868A1 (fr) * 1983-01-25 1984-07-27 Feuillee Michel Capteur capacitif de deplacement integre a un organe de machine de type piston-cylindre
US4686902A (en) * 1986-10-31 1987-08-18 Precision Engineered Systems Inc. Automatic blanket wash system
EP0335967B1 (fr) * 1987-08-17 1992-01-15 Precision Engineered Systems Inc. Systeme de lavage automatique de blanchet a ecoulement a travers des barres de pulverisation
US5005478A (en) * 1987-12-16 1991-04-09 Precision Engineered Systems Inc. Blanket wash system with sub-ambient pressure circulation
US5330576A (en) * 1990-04-26 1994-07-19 Baldwin-Gegenheimer Gmbh Recirculating coating liquid supply system with viscosity regulation
DE4216423A1 (de) * 1992-05-18 1993-11-25 Baldwin Gegenheimer Gmbh Druckwerks-Waschvorrichtung für Druckmaschinen
DE4318647A1 (de) * 1993-06-04 1994-12-08 Baldwin Gegenheimer Gmbh Flüssigkeits-Sprühvorrichtung, insbesondere für Druckmaschinen
WO1995006545A1 (fr) * 1993-09-02 1995-03-09 Smc Kabushiki Kaisha Structure d'actuateur
US5683508A (en) * 1995-08-25 1997-11-04 Fit Group, Inc. Coating apparatus and method for dispensing a liquid, and draining and cleaning a coating apparatus
US6010032A (en) * 1997-06-19 2000-01-04 Emes N.V. Continuous dispensing system for liquids
DK0916492T3 (da) * 1997-11-14 2001-10-29 Elettra Srl Anordning til forsyning af væskeformigt rengøringsmiddel
DE19920230A1 (de) * 1999-05-03 2000-11-09 Baldwin Grafotec Gmbh Reinigungsvorrichtung für die graphische Industrie
EP1106355A1 (fr) 1999-12-06 2001-06-13 Oxy-Dry Maschinen GmbH Dispositif pour nettoyer des cylindres d'une machine d'impression
DE10127442A1 (de) * 2001-06-07 2002-12-12 Baldwin Germany Gmbh Druckmaschinenzylinder-Reinigungsvorrichtung

Also Published As

Publication number Publication date
US20060288894A1 (en) 2006-12-28
DE502005007747D1 (de) 2009-09-03
US7530307B2 (en) 2009-05-12
EP1719621A1 (fr) 2006-11-08

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