EP0916492A1 - Dispositif d'alimentation du produit de nettoyage liquide - Google Patents

Dispositif d'alimentation du produit de nettoyage liquide Download PDF

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Publication number
EP0916492A1
EP0916492A1 EP97119983A EP97119983A EP0916492A1 EP 0916492 A1 EP0916492 A1 EP 0916492A1 EP 97119983 A EP97119983 A EP 97119983A EP 97119983 A EP97119983 A EP 97119983A EP 0916492 A1 EP0916492 A1 EP 0916492A1
Authority
EP
European Patent Office
Prior art keywords
dispensing
bar
pressure
pumps
cleaning
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.)
Granted
Application number
EP97119983A
Other languages
German (de)
English (en)
Other versions
EP0916492B1 (fr
Inventor
Marco Corti
Riccardo Fumagalli
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.)
FINELETTRA INTERNATIONAL S.A.
Original Assignee
Elettra Srl
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 Elettra Srl filed Critical Elettra Srl
Priority to DK97119983T priority Critical patent/DK0916492T3/da
Priority to ES97119983T priority patent/ES2161407T3/es
Priority to AT97119983T priority patent/ATE205783T1/de
Priority to EP97119983A priority patent/EP0916492B1/fr
Priority to DE69706868T priority patent/DE69706868T2/de
Publication of EP0916492A1 publication Critical patent/EP0916492A1/fr
Application granted granted Critical
Publication of EP0916492B1 publication Critical patent/EP0916492B1/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
    • 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
    • B41P2235/20—Wiping devices
    • B41P2235/24—Wiping devices using rolls of cleaning cloth
    • 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
    • B41P2235/00—Cleaning
    • B41P2235/30—Recovering used solvents or residues
    • B41P2235/31—Recovering used solvents or residues by filtering

Definitions

  • the same bar 1 also houses the pneumatic actuators 6 which, on command, push the presser element 4, 5 against the cylinder 2 so as to bring the latter into contact with the intermediate cloth 7 onto which cleaning fluids are sprayed by nozzles 9 mounted in one or more seats 8 formed in that side of the bar that faces the cloth.
  • These nozzles connect up, via holes 10, with channels 1000 milled along a flat face of the said bar on which a gasket 12 is then placed and a covering means 13 fixed by means of screws 14, thereby turning the said channels into proper pipes.
  • These channels are symmetrically connected to other feed conduits which are arranged in circuits flowing parallel to each other, come together at forks and gradually decrease in number until they join up with a single fluid feed pipe 15 located at one end of the bar 1.
  • each fork in the said channels is essentially "Y"-shaped and occurs in a straight section of pipe, and that the channels produced by the fork are structured such that they offer essentially the same degree of resistance to the passage of the fluids, so that the latter split into flows of essentially equal volume at each fork in the pipe.
  • the number of forks is such that each terminal channel is of limited length and feeds a limited number of nozzles 9. In the embodiment illustrated in the application cited above, the terminal channels fed three nozzles in series.
  • the channels continue to fork until each terminal channel produced by a fork feeds a single nozzle, in order to ensure an even more uniform distribution of the cleaning fluids to the various nozzles of the apparatus.
  • the reference numeral 15 denotes the pipe located at one end of the bar and connected to the cleaning fluid delivery system mentioned earlier.
  • the pipe 15 communicates, via the perpendicular hole 16, with a first channel 100 formed longitudinally in the bar 1 and which, before it reaches the middle 18 of the bar, forks at B1 into two opposite straight pipes 101, 201 which, before they reach the middle of each respective half-bar, fork at B2 and B3 respectively, forming corresponding pairs of identical, mutually aligned pipes 102, 202 and 103, 203 which in turn fork at B4, B5 and B6, B7 respectively forming pairs of pipes 104, 204, 105, 205 and 106, 206, 107, 207 which then fork again, for the last time, at B8, B9, B10, B11 and B12, B13, B14, B15 respectively, which, via their respective conduits 108, 208, 109, 209, 110, 210, 111, 211, 112, 212
  • each main channel Following each main channel are two initially straight channels located a short distance from each other and parallel to and equidistant from the channel upstream.
  • the common wall via which the channels formed by each fork join up with the channel upstream has a "V" shape when viewed from above and has a sharp point.
  • the two arms that follow each fork one has a "Z” or “S” shape, and the other a "U” or “C” shape.
  • the reference numeral 26 denotes straight milled portions formed in the base of the conduit 11 which carries the channels for conveying the cleaning liquids. These milled portions contain the threaded blind holes 114 in which the screws 14 engage in order to screw down the components 12, 13 which define the said channels according to the known art (Fig. 1).
  • each fork is of appropriate depth and width, as may be seen in Figure 1.
  • the initial conduit 100 is approximately 10 mm deep and approximately 5 mm wide, while the arms of the final forks are approximately 3 mm wide and approximately 2.5 mm deep.
  • the bar illustrated in Figures 3 and 3a actually has twenty-four nozzles supplied by channels containing fifteen forks, essentially as in the previous bar except that the final forks subsequently split into three-way branches T1, T2, T3, T4, T5, T6, T7, T8, immediately after their straight sections, as illustrated in the detail shown in Figure 4.
  • These branches are symmetrically and centrally positioned relative to the fork, with one arm having an "S” or “Z” shape, one having a "U” or “C” shape and the intermediate arm having a rounded "L” shape, each of the three arms feeding the hole 10 of one nozzle 9.
  • Figure 5 illustrates how, in the variant embodiment of Figures 3 and 3a, the channels for conveying the cleaning fluids also have differing widths and depths in order to compensate for losses in pressure.
  • the initial pipes are, for example, 4 mm wide and 8 mm deep. After the first fork their width goes down to 3 mm and their depth to 6 mm. After the next fork their width remains the same but their depth is reduced to 3 mm. At the next fork their depth remains the same but their width is reduced to 2 mm. The arms of the final fork are 2.5 mm deep and this depth, and the width of 2 mm, remain unchanged to the end.
  • the nozzles 9 can be replaced by a rectinlinear pad 70, made of any suitable porous material which will not oxidize or be broken down by the liquids to be dispensed but is nevertheless permeable to them, housed in a straight recess 71 formed in the active face of the bar 1, parallel to the recess 3. At the base of the recess 71 there is a small continuous chamber 72 which acts as a reservoir and into which the holes 10 for dispensing the cleaning fluid open.
  • the pad 70 may advantageously be formed by a plurality of inserts 70' which have the same dimensions and are identical to each other, except for the end inserts 70'' which have one rounded end so that they can fit in a leaktight manner into the corresponding ends of the recess 71 (Fig. 9).
  • the inserts 70', 70'' are held in the recess 71 by suitable means so that, if need be, they can be easily removed, for example so that they can be cleaned or replaced periodically.
  • the inserts 70', 70'' are dimensioned such that they can be inserted very accurately into the recess 71 and may also have a longitudinal hole 73 through which a support rod 74 passes which also passes through holes formed in the ends of the bar 1, the threaded ends of the said rod being fixed to the ends of the bar by means of nuts 75.
  • Figure 7 shows that the pad 70 is preferably positioned so that its face is in view and lies in the same plane as the wall of the bar 1 which comes into contact with the cloth 7 when the presser element 4, 5 is in the retracted rest position.
  • the liquid to be sprayed is fed via the holes 10 into the small manifold 72 from which it is uniformly fed to the pad 70 which uniformly wets the cloth 7.
  • the cloth 7 is preferably stationary. Once the liquid has been dispensed, the cloth 7 is moved until its wetted part is in front of the presser element 4, 5 which is then activated, as shown in Figure 8, so as to clean the rubber-covered roller 2.
  • circuits that feeds the cleaning fluids to the dispensing bar will now be described with reference to Figure 6.
  • the circuits employed in the previous patents differed from known solutions in that, while appropriate amounts of detergent liquid were being injected into the system as and when needed, a continuous stream of air was simultaneously being injected, via a circuit parallel to the circuit for feeding the liquid to the dispensing bar. This air acted as a conveying medium and was necessary for the atomization and the uniform dispersion of the liquid by the said dispensing bar and was, for this purpose, kept at a suitable pressure below that of which the liquid was injected.
  • the circuit embodiment adopted involved using pressure regulators on the pneumatic circuit and the hydraulic circuit and using hydropneumatic compensators on the latter circuit, all of which made the system complex in terms of construction and unreliable whenever there were pressure variations in the pneumatic circuit.
  • the invention provides a simple and reliable solution to this problem, ensuring that the liquid injection pressure is always correlated to the air injection pressure and is always greater than the latter by an exact amount, even if the air injection pressure is subject to sudden and substantial variations.
  • This technical problem has been solved by using reciprocating positive displacement pumps activated by pneumatic actuators which are fed by the same source and at the same pressure as the air which is conveyed towards the dispensing bar, the pistons of these actuators having a diameter suitably greater than that of the pump.
  • the reference numerals 43 and 44 denote the water and solvent tanks respectively which, by means of immersed elements 60, 160, filters 61, 161 and one-way valves 62, 162, are connected to the chambers C1, C1', which have identical sections, of respective positive displacement pumps 63, 163, the pistons are 64, 164 of which is activated by respective cylinder and piston units 65, 165 having identical characteristics.
  • the diameter of the pistons in these units is suitably greater than that of their associated pumps.
  • the pressure produced is inversely proportional to the section of the piston of the unit generating it, so that the pumps will deliver a pressure which is always greater than that of the pneumatic actuating circuit, which is the pressure conveyed to the dispensing bar.
  • the chambers C2, C2' communicate freely with the atmosphere, also acting as indicators to warn of any failure in the sealing efficiency of the pump pistons.
  • the scope of the invention also encompasses a variant embodiment in which the pumps 63, 163 are used as double-acting machines.
  • the units consisting of the pumps and their actuators need not necessarily be made according to the integrated embodiment illustrated in Figure 6 in which the bodies of the pumps are coaxially integral with the bodies of the actuators and the piston of each pump/actuator unit is integral with a common rod.
  • the chambers C1, C1' of the pumps are connected by means of one-way valves 66, 166 - which are inverse to the previous one-way valves 62, 162 - to solenoid valves 34, 35, the outlets of which are connected in parallel to each other and to the pipe 32 that feeds the abovementioned pipe 15 of the dispensing bar.
  • This pipe 32 is also connected, via a parallel circuit which includes a one-way valve 67, to the outlet of any suitable solenoid valve 31 which is connected upstream to the compressed air source 27 via a pressure regulator 30 of any suitable type together with corresponding manometers 53.
  • This same compressed air feed circuit is connected to any suitable solenoid valve 68 which is capable of switching the feed to and discharge from the cylinder and piston units 65, 165 that activate the positive displacement pumps 63, 163, this solenoid valve 68 also having an intermediate state in which it shuts off the pneumatic feed to the said units.
  • the manostats interface with a processor 51 which controls the various solenoid valves and which can be suitably programmed by means of the keyboard/ display unit 52.
  • the operation of the system thus designed as regards its main components is simple and self-evident.
  • the solenoid valve 68 switches into the state 168 in which the actuators 65, 165 generate an increase in the volume of the chambers C1, C1' of the pumps, thereby sucking the liquids up from the tanks 43, 44 via the valves 62, 162 which open.
  • the valves 66, 166 remain closed and isolate the pumps from the delivery circuit.
  • the end of the suction stroke of the pumps can be detected by the manostat 69 or can be controlled by a timer circuit (not illustrated) which is also connected to the processor 51 which, at the appropriate stage, switches the solenoid valve 68 into the intermediate state thereby shutting off the pneumatic feed to the units 65, 165.
  • This stage in which the positive displacement pumps are filled is carried out at any time prior to each washing cycle, in other words before the apparatus in question is to feed the dispensing bar.
  • the processor 51 switches the solenoid valve 68 into the state 268 which causes the actuators 65, 165 to reduce the volume of the chambers C1, C1'.
  • the solenoid valves 34, 35 and 31 are also switched in phase.
  • the liquids discharged from the pumps flow through the valves 66, 166, through the solenoid valves 34, 35 and arrive at the pipe 32 that feeds the dispensing bar, mixed with air arriving via the solenoid valve 31.
  • the two liquid flows are at the same pressure - which is suitably greater than the pressure of the compressed air arriving via the valves 31, 67, so that the entire mixture tends to flow uniformly towards the pipe 32 which is at atmospheric pressure.
  • Good results have, for example, been achieved in cases where the diameters of the pistons of the actuators and of the pumps differ by between 5 and 10 mm, for example by approximately 7 mm.
  • the pump piston has been given a diameter of approximately 63 mm, while the piston of the corresponding pneumatic actuator has, for example, been given a diameter of approximately 70 mm.
  • a pneumatic circuit pressure of 7 bar corresponds to a liquid overpressure of 1.64 bar.
  • a pneumatic pressure of 6 bar corresponds to a liquid overpressure of 1.4 bar, that is 0.24 bar less than the initial overpressure - an amount virtually undetectable by the conveying and dispensing system.
  • a reduction of 0.24 bar corresponds to a decrease of approximately 15% in the flow of liquid and air to the bar with the nozzles and onto the cloth which nevertheless is still sprayed and lubricated within values that can be tolerated by the physical characteristics of the rubber-covered cylinder to be cleaned. It should be borne in mind, however, that a pressure drop of 1 bar is quite large and unlikely to occur in a pneumatic system which is always equipped with a suitable accumulation reservoir and possibly even with a suitable hydropneumatic accumulator.
  • the volumetric capacity of the pumps 63, 163 is preferably greater than the maximum amount of liquid that needs to be sprayed onto the cleaning cloth during each cycle. At the end of each cycle, the pumps are switched to suction mode, they return to their maximum filled state and then stand by to carry out the next cycle.

Landscapes

  • Nozzles (AREA)
  • Detergent Compositions (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Cleaning In General (AREA)
EP97119983A 1997-11-14 1997-11-14 Dispositif d'alimentation du produit de nettoyage liquide Expired - Lifetime EP0916492B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DK97119983T DK0916492T3 (da) 1997-11-14 1997-11-14 Anordning til forsyning af væskeformigt rengøringsmiddel
ES97119983T ES2161407T3 (es) 1997-11-14 1997-11-14 Dispositivo para el suministro de un producto de limpieza liquido.
AT97119983T ATE205783T1 (de) 1997-11-14 1997-11-14 Vorrichtung zum zuführen von flüssigem reinigungsmittel
EP97119983A EP0916492B1 (fr) 1997-11-14 1997-11-14 Dispositif d'alimentation du produit de nettoyage liquide
DE69706868T DE69706868T2 (de) 1997-11-14 1997-11-14 Vorrichtung zum Zuführen von flüssigem Reinigungsmittel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97119983A EP0916492B1 (fr) 1997-11-14 1997-11-14 Dispositif d'alimentation du produit de nettoyage liquide

Publications (2)

Publication Number Publication Date
EP0916492A1 true EP0916492A1 (fr) 1999-05-19
EP0916492B1 EP0916492B1 (fr) 2001-09-19

Family

ID=8227619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97119983A Expired - Lifetime EP0916492B1 (fr) 1997-11-14 1997-11-14 Dispositif d'alimentation du produit de nettoyage liquide

Country Status (5)

Country Link
EP (1) EP0916492B1 (fr)
AT (1) ATE205783T1 (fr)
DE (1) DE69706868T2 (fr)
DK (1) DK0916492T3 (fr)
ES (1) ES2161407T3 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10000549A1 (de) * 2000-01-08 2001-07-12 Baldwin Grafotec Gmbh Waschbalken für Druckmaschinenzylinder
DE10000555A1 (de) * 2000-01-08 2001-07-12 Baldwin Grafotec Gmbh Waschbalken für Druckmaschinenzylinder
WO2001062497A1 (fr) * 2000-02-25 2001-08-30 Marco Corti Barrette d'alimentation en melange de detergent fluide prevue dans un dispositif de nettoyage automatique des cylindres de machines d'imprimerie
EP1155860A2 (fr) * 2000-05-19 2001-11-21 Riccardo Fumagalli Procédé et dispositif pour nettoyer les cylindres d'une machine d'impression
EP1155862A2 (fr) * 2000-05-19 2001-11-21 Riccardo Fumagalli Procédé et dispositif pour nettoyer le cylindre blanchet d'une machine d'impression
EP1719621A1 (fr) * 2005-05-02 2006-11-08 Oxy-Dry Maschinen GmbH Système de nettoyage pour les surfaces des cylindres d'une machine d'impression
WO2008014837A1 (fr) * 2006-08-02 2008-02-07 Technotrans Ag Dispositif de nettoyage de surfaces de cylindres d'impression

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525982A (en) * 1948-04-27 1950-10-17 Addressograph Multigraph Apparatus for cleaning printing surfaces in offset printing machines
US4540445A (en) * 1984-06-27 1985-09-10 Burns Jr William P Method and apparatus for cleaning gripper assemblies
EP0636476A1 (fr) * 1993-07-27 1995-02-01 ELETTRA S.r.l. Dispositif pour nettoyer les cylindres blanchets d'une machine à imprimer
DE19619143A1 (de) * 1996-05-11 1997-11-13 Heidelberger Druckmasch Ag Vorrichtung zum Reinigen von Zylindermantelflächen in Rotationsdruckmaschinen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB569446A (en) * 1942-10-14 1945-05-24 Goss Printing Press Co Ltd Improvements in or relating to ink-applying means for rotary printing presses
IT1279630B1 (it) * 1995-09-14 1997-12-16 Elettra Srl Apparato per la pulitura automatica dei cilindri in caucciu' delle macchine da stampa

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525982A (en) * 1948-04-27 1950-10-17 Addressograph Multigraph Apparatus for cleaning printing surfaces in offset printing machines
US4540445A (en) * 1984-06-27 1985-09-10 Burns Jr William P Method and apparatus for cleaning gripper assemblies
EP0636476A1 (fr) * 1993-07-27 1995-02-01 ELETTRA S.r.l. Dispositif pour nettoyer les cylindres blanchets d'une machine à imprimer
DE19619143A1 (de) * 1996-05-11 1997-11-13 Heidelberger Druckmasch Ag Vorrichtung zum Reinigen von Zylindermantelflächen in Rotationsdruckmaschinen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10000549A1 (de) * 2000-01-08 2001-07-12 Baldwin Grafotec Gmbh Waschbalken für Druckmaschinenzylinder
DE10000555A1 (de) * 2000-01-08 2001-07-12 Baldwin Grafotec Gmbh Waschbalken für Druckmaschinenzylinder
WO2001062497A1 (fr) * 2000-02-25 2001-08-30 Marco Corti Barrette d'alimentation en melange de detergent fluide prevue dans un dispositif de nettoyage automatique des cylindres de machines d'imprimerie
JP2003523854A (ja) * 2000-02-25 2003-08-12 コルティ，マルコ 印刷機の胴の自動清掃装置における流体状洗浄剤混合物供給用バー
EP1155860A2 (fr) * 2000-05-19 2001-11-21 Riccardo Fumagalli Procédé et dispositif pour nettoyer les cylindres d'une machine d'impression
EP1155862A2 (fr) * 2000-05-19 2001-11-21 Riccardo Fumagalli Procédé et dispositif pour nettoyer le cylindre blanchet d'une machine d'impression
EP1155862A3 (fr) * 2000-05-19 2003-01-22 Riccardo Fumagalli Procédé et dispositif pour nettoyer le cylindre blanchet d'une machine d'impression
EP1155860A3 (fr) * 2000-05-19 2003-01-22 Marco Corti Procédé et dispositif pour nettoyer les cylindres d'une machine d'impression
EP1719621A1 (fr) * 2005-05-02 2006-11-08 Oxy-Dry Maschinen GmbH Système de nettoyage pour les surfaces des cylindres d'une machine d'impression
US7530307B2 (en) 2005-05-02 2009-05-12 Baldwin Oxy-Dry Gmbh Cleaning system for cylinder surfaces of a printing machine
WO2008014837A1 (fr) * 2006-08-02 2008-02-07 Technotrans Ag Dispositif de nettoyage de surfaces de cylindres d'impression

Also Published As

Publication number Publication date
DE69706868D1 (de) 2001-10-25
DE69706868T2 (de) 2002-04-11
EP0916492B1 (fr) 2001-09-19
ATE205783T1 (de) 2001-10-15
ES2161407T3 (es) 2001-12-01
DK0916492T3 (da) 2001-10-29

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