EP0570763B1 - Dispositif de lavage pour machine à imprimer - Google Patents

Dispositif de lavage pour machine à imprimer Download PDF

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Publication number
EP0570763B1
EP0570763B1 EP93107263A EP93107263A EP0570763B1 EP 0570763 B1 EP0570763 B1 EP 0570763B1 EP 93107263 A EP93107263 A EP 93107263A EP 93107263 A EP93107263 A EP 93107263A EP 0570763 B1 EP0570763 B1 EP 0570763B1
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EP
European Patent Office
Prior art keywords
liquid
intermediate store
printing mechanism
metering pump
distribution line
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
EP93107263A
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German (de)
English (en)
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EP0570763A1 (fr
Inventor
Hans-Joachim Kurz
Harald Wolfgang Meisel
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Baldwin Grafotec GmbH
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Baldwin Grafotec GmbH
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Publication of EP0570763A1 publication Critical patent/EP0570763A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/06—Cleaning arrangements or devices for offset cylinders
    • 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
    • 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 invention relates to a printing unit washing device for printing machines according to the preamble of claim 1.
  • the printing unit washing device is used to apply washing liquid, for example water, to printing unit parts such as, for example, blanket cylinders, plate cylinders, printing cylinders, ink transfer rollers or to a washing cloth for the mechanical cleaning of such printing unit cylinders and printing unit rollers.
  • the printing press can in particular be an offset printing press.
  • a printing machine washing device of this type is known from German patent DE 28 26 135 C2. It contains a nozzle bar, with which washing liquid can be sprayed onto a cloth, with which a blanket cylinder of a printing press is cleaned.
  • the nozzle bar is connected to liquid supply lines via an intermediate store in the form of a line cross and check valves which open in the direction of the intermediate store and close in the opposite direction, each of which can be supplied with a washing liquid by a metering pump.
  • the dosing pumps are operated by controlled valves.
  • the amount of liquid delivered by one of the metering pumps to the intermediate store during a delivery process is dependent on the opening time of its controlled valve and is therefore adjustable.
  • the metered quantity of liquid stored in the intermediate store is then expelled through a compressed air column through the nozzle bar and sprayed with it.
  • a washing liquid is to be supplied to a plurality of nozzle bars, then line sections of different lengths from the intermediate store to the nozzle bars or a number of metering pumps per liquid type corresponding to the number of nozzle bars are necessary.
  • the washing liquid will already reach the nozzle bars of the shorter lines when the longer liquid lines are only partially filled with liquid and the nozzle bars are still empty. As a result, not all washcloths are moistened with liquid during the first cleaning cycles, and there is inadequate cleaning and thus inadequate print quality.
  • EP-A-0 441 019 A1 relates to a printing blanket cleaning system in which fluid control systems direct solvents, water and air in certain quantities and under certain pressures to spray systems.
  • the spray systems mix solvent and water in one line and eject the mixture into a spray bar. The mixture is then expelled through the spray bar as spray fluid using air pressure.
  • the object of the invention is to provide a washing device for printing units of printing presses in which one or more intermediate stores can be filled with liquid more quickly without high liquid pressures being required over longer periods of time and without leakage problems arising from high liquid pressures. Furthermore, the invention is to design the printing unit washing device in such a way that only one metering pump per type of liquid is required for the supply of liquid to several nozzle bars, and the liquid paths from the intermediate stores to their nozzle bars can be of the same length for all nozzle bars.
  • the intermediate stores and the downstream line paths should have such narrow line cross sections and be so short, that an adverse mixing of the compressed air column with the liquid in the intermediate stores and in the liquid paths is avoided.
  • the washing device should be designed so that it works automatically controlled and the liquid discharge quantities and liquid discharge times of the nozzle units can be set individually and controlled automatically.
  • the possible uses of the washing device should not be limited to the moistening of washcloths for wet cleaning of blanket cylinders, but the washing device should also be suitable for wet cleaning of other printing press parts such as plate cylinders, ink transfer rollers and for cleaning blanket cylinders without the interposition of a cleaning element such as a washcloth .
  • the printing unit washing device shown in FIG. 1 of the drawings is suitable for the wet cleaning of printing press parts such as, for example, blanket cylinders, plate cylinders, printing cylinders, ink transfer rollers, etc., of printing presses, in particular of offset printing presses.
  • liquid can either be sprayed directly onto these printing machine parts or onto a cleaning element, in particular a washing cloth, with which these machine parts are cleaned mechanically, preferably automatically.
  • the printing press has, for example, three printing units 1, 2 and 3, and that each printing unit has a nozzle bar 6, 7 and 8 for spraying one of at least two different liquids onto a printing unit part of these printing units which is to be damp-cleaned or on a washcloth for cleaning printing unit parts is assigned to these printing units 1, 2 and 3.
  • a larger number of printing units or only two printing units can also be provided; one, two or more nozzle bars 6, 7 and 8 can be assigned to each printing unit; and more than the two liquid reservoirs shown can be connected to each nozzle bar 6, 7 and 8.
  • the nozzle bars 6, 7 and 8 are preferably tubes which are provided with nozzles or nozzle openings 80.
  • the liquid can be water, liquid detergent or detergent enriched with water or another Liquid can be used.
  • two liquid reservoirs 11 and 12 are provided.
  • a metering pump 14 is provided for each liquid reservoir. Its suction side 15 contains a check valve 16 opening in the suction direction and sucks a predetermined amount of liquid from the liquid reservoir 11 via a fine filter 17 and an immersion lance 18 connected upstream to it with a filter 19 at the upstream lance end when the metering pump 14 performs a suction stroke.
  • This predetermined amount of liquid is stored in the metering pump 14.
  • the metering pump 14 is preferably a piston pump. It is shown in Fig.
  • a compressed air source 26 can alternatively be connected via a pressure reducer 27 and a controllable changeover valve 28 on one side or on the other side of the drive piston 22 to its cylinder space 29. In the illustrated starting position, the compressed air source 26 is connected in terms of flow to the part of the cylinder space 29 located below the drive piston 22.
  • the part of the cylinder chamber 29 located above the drive piston 22 is vented via the same controllable valve 28 and a silencer provided on the pump 14.
  • the Compressed air source 26 is connected in terms of flow to the part of the cylinder space 29 located above the drive piston 22 in FIG. 1, and the part of the cylinder space 29 located below the drive piston 22 is vented via the controllable valve 28 and the same silencer.
  • the controllable valve 28 is controlled by an electrical control device 33, preferably as a function of a specific operating program.
  • the control device 33 preferably contains a microcomputer for the operating program.
  • the drive piston 22 moves together with the delivery piston 21 from the upper position shown in FIG. 1 to a lower position.
  • the delivery piston 21 sucks a certain amount of liquid from the liquid reservoir 11 into the part of its delivery piston cylinder space 35 located above it.
  • This amount of liquid is so large that it is certainly sufficient for a single liquid spraying operation on all nozzle bars 6, 7 and 8.
  • the amount can be, for example, 200 ml.
  • signal transmitters 37, 38 and 39 are arranged which, depending on the axial position of the drive piston 22, provide the control device 33 with signals which indicate the axial position of the drive piston 22 in each case . It can thus be determined how much liquid is still in the pump 14 during the delivery stroke.
  • the compressibility of air in contrast to the incompressibility of liquid, can be used to determine whether there is air or only in the line part connected to the pressure side 40 of the pump 14 Liquid. If the line part connected to the pressure side 40 is closed and the drive piston 22 is acted upon in the direction of a delivery stroke, in FIG. 1 from below, with compressed air from the compressed air source 26, then the drive piston 22 can only move upwards when on the Pressure side 40 of the pump is air, but not when the pressure side 40 and the line part connected to it are completely filled with liquid.
  • Such a functional test is particularly important if the immersion lance 18 is removed from the reservoir 11 and inserted into the liquid of another reservoir 11, for example if the first reservoir 11 no longer contains sufficient liquid.
  • each liquid reservoir 11, 12 there is a level switch 42, which generates an optical, acoustic or electrical alarm signal by an alarm system 44 when the liquid level in the liquid reservoir has dropped to a certain lower level.
  • the liquid reservoir 11, 12 has to be refilled or replaced by a completely different liquid reservoir.
  • the particular advantage of the washing device is that the liquid reservoirs 11, 12 can be commercially available canisters.
  • the metering pump 14 has on its pressure side 40 a check valve 48 that opens in the pressure direction and closes in the suction direction of the metering pump 14.
  • the upstream beginning 50 of a liquid distributor line 52 is connected to this check valve 48.
  • a return line 55 is connected via a back pressure valve 54, which is a controllable on-off valve 54, the outlet end 49 of which opens into the upper part of the liquid reservoir 11 of this metering pump 14.
  • liquid supply lines 56, 57, 58, 59 are each connected to the distribution line 52 via a controllable on-off valve 62, 63, 64 and 65, for example 4 pieces, such as nozzle bars 6 , 7, 8, etc. are to be supplied with liquid from the same liquid reservoir 11.
  • the downstream ends of the liquid supply lines 56, 57, 58 and 59 are each via a check valve 66, 67 and 68, which opens in the pressure direction of the pump 14, to an intermediate store 72, 73, 74 for which it is supplied by the pump 14 via one of the liquid supply lines 56, 57 , 58 metered amount of liquid supplied connected.
  • Each buffer store 72, 73, 74 is formed by a pipe or a hose with a narrow pipe duct or hose duct, the diameter and length of which form the maximum storage capacity of the buffer store.
  • the channel is so narrow that liquid stored in it is pushed through a compressed air column with a small amount of air and sprayed from the associated nozzle bar without the air mixing with the liquid.
  • the back pressure valve 54, 54/2 of each manifold 52, 52/2 serves several purposes.
  • a new liquid reservoir 11, 12 is started up, it serves the metering pump 14 after a suction stroke and subsequent delivery stroke, 14/2 for venting and thus complete and air-free filling of the distribution line 52, 52/2 with liquid.
  • the counterpressure valve 54, 54/2 closes this distributor line and the metering pump generates a specific liquid metering pressure in it.
  • the relevant back pressure valve 54 and / or 54/2 is opened, so that the distributor line 52 or 52/2 is depressurized again.
  • the metered amount of liquid which is conveyed from the metering pump 14, 14/2 via the distributor line 52, 52/2 into the intermediate store 72, 73 or 74 is dependent on that of the metering pump 14 or 14/2 in its distributor line 52 or 52/2 generated liquid metering pressure and the opening period of the relevant controllable valve 62, 63, 64 or 65, which is closed in the idle state and opened for the supply of the liquid to the relevant intermediate store 72, 73 or 74 for a certain metering period becomes.
  • the controllable valve 62 for the intermediate store 72 is opened, while all other controllable valves 63, 64 and 65 and 54 are closed; to supply liquid to the intermediate store 73, the valve 63 is opened for a certain period of time, while all the other valves 62, 64, 65 and 54 are closed; to supply liquid to the buffer 74, the valve 64 is opened for a certain period of time, while all other valves 62, 63, 65 and 54 are closed; etc.
  • the nozzle bars 6, 7 and 8 each have a plurality of nozzles 80 which are directed against the printing unit assigned to them or against a specific printing machine part to be moistened, for example a washing cloth.
  • the nozzle bars 6, 7 and 8 each preferably extend over the entire width of the printing unit, and they contain a channel which extends essentially over the same width for supplying all nozzles 80 with liquid.
  • Each buffer store 72, 73, 74 has an upstream end 92 and a downstream end 93.
  • the liquid supply lines 56, 57, 58 are each in flow via one of the check valves 66, 67, 68 at a point located between the two ends 92 and 93 the buffers 72, 73, 74 connected.
  • the metered, stored quantity of liquid can thus be pushed from the intermediate store into the nozzle unit 6, 7 or 8 assigned to it by a compressed air column at the upstream end 92 into the intermediate store 72, 73, 74 and from there onto a washcloth or another printing unit part to be moistened Printing unit 1, 2 or 3 can be sprayed.
  • each intermediate store 72, 73, 74 is in each case via a check valve 96, 97, 98 which opens in the compressed air direction and closes in the opposite direction and upstream connected compressed air lines 102, 103 and 104, in which a controllable compressed air-on-to valve 106, 107, 108 is located, the compressed air source 26 is connected.
  • the controllable compressed air valves 106, 107 and 108 can contain pressure reducers, or a pressure reducer 110 can be arranged in a compressed air supply line 109 between the compressed air source 26 and these compressed air valves.
  • the pressure of the air with which the metered amount of liquid is expelled from the relevant intermediate store 72, 73, 74 through the associated nozzle bar 6, 7 and / or 8 can be set on the pressure reducer 110. If instead of a common pressure reducer 110 each individual compressed air line 102, 103 and 104 contains a pressure reducer, the air pressure for each nozzle bar 6, 7 and 8 can be set individually.
  • the second liquid reservoir 12 contains, for example, water as the washing liquid. From this second liquid reservoir 12, in the same way as the first liquid reservoir 11, by means of an immersion lance 18/2, a metering pump 14/2, a distribution line 52/2, controlled valves 62/2, 63/2, 64/2, 65/2, connected liquid supply lines 56/2, 57/2, 58/2, 59/2 etc. , and at the ends of each via a check valve 66/2, 67/2, 68/2 each a metered amount of liquid in the buffer 72, 73, 74 promoted.
  • the downstream end 53/2 of the distribution line 52/2 is optionally closed by a controllable back pressure valve 54/2, so that a metered amount of liquid is conveyed from the metering pump 14/2 into one or all of the intermediate stores 72, 73, 74 or is opened , so that the distribution line 52/2 is vented into the second liquid reservoir 12 or liquid is emptied from it.
  • the parts required for conveying liquid from the second reservoir 12 are structurally and functionally identical to parts for conveying the liquid of the first liquid reservoir 11, they are provided with the same reference numbers and with an additional identification number "2" and their function becomes not described again here.
  • the second metering pump 14/2 is controlled by the same electrical control device 33 by means of a computer program via a changeover valve 28/2, which is the same as the changeover valve 28 of the first pump 14.
  • the washing device has the advantage that only one pump 14, 14/2 is required for each liquid, that is to say for each liquid reservoir 11 and 12, regardless of how many nozzle bars 6, 7, 8 are supplied with the liquid from a liquid reservoir.
  • a further advantage is that the distances over which a metered amount of liquid is conveyed to the nozzle bars 6, 7, 8 are of the same length in all the nozzle bars 6, 7, 8. These distances are also shorter than 1 m, so that water is sprayed on all nozzle bars 6, 7 and 8 without air mixing and the same spray patterns are generated.
  • the distribution lines 52 and 52/2 are each designed as a ring line 52/3 for one liquid reservoir 11 and as a ring line 52/4 for the other liquid reservoir 12, and they extend from the pressure side 40 of the metering pump 14 and 14/2 respectively along all nozzle bars 6, 7, 8, and in parallel past all nozzle bars 6, 7, 8 back to the controlled back pressure valve 54 or 54/2 in the vicinity of the associated liquid reservoir 11 or 12
  • the return lines 55 and 55/2 of these back pressure valves open into the reservoir 11 or 12 assigned to them.
  • the compressed air supply line 109 of the compressed air source 26 also extends along all the nozzle bars 6, 7 and 8.
  • the controllable compressed air open valve 106 is connected to the upstream end 92 of the intermediate store 72 of the first nozzle bar 6 instead of the check valve 96; to the upstream end 92 of the intermediate store 73 of the second nozzle bar 7, the controllable compressed air open valve 107 is connected instead of the check valve 97; to the upstream end 92 of the third buffer 74, the controllable compressed air-on-valve 108 is connected instead of the check valve 98; and the upstream inlets of these controllable valves 106, 107 and 108 are each connected directly or by very short compressed air lines 102, 103 and 104 to the compressed air supply line 109 of the compressed air source 26 provided with a pressure reducer 110.
  • the controllable liquid-on-to-valves instead of the liquid check valves are connected to the intermediate stores 72, 73 and 74 between their two ends 92 and 93.
  • the controllable liquid-on-to-valve 62 is connected to the intermediate store 72 instead of the check valve 66; the controllable liquid on-off valve 63 is connected to the intermediate store 73 instead of the check valve 67; the controllable liquid-on-to-valve 64 is connected to the intermediate storage 74 instead of the check valve 68; and the pressure sides of these controllable valves 62, 63, 64 are each connected directly or via short liquid supply lines 56, 57, 58 to the distributor line 52/3, which is designed as a ring line, at locations which lie between the pressure side 40 of the metering pump 14 and the controllable back pressure valve 54 .
  • the ring line 52/3 and all parts connected to it can be depressurized by opening the back pressure valve 54.
  • controllable liquid open valve 62/2 is connected to the intermediate store 72 instead of the check valve 66/2; the controllable valve 63/2 is connected to the buffer 73 instead of the check valve 67/2; the controllable valve 64/2 is connected to the intermediate storage 74 instead of the check valve 68/2; and all of these controllable valves 62/2 63/2 and 64/2 are connected with their pressure side either directly or via only short liquid supply lines 56/2, 57/2 or 58/2 to the ring line 52/4 at locations which lie between the pressure side 40 of their metering pump 14/2 and their back pressure valve 54/2. By opening the back pressure valves 54 and 54/2, the entire system is vented and depressurized.
  • the washing device according to FIG. 2 has the advantage over that of FIG. 1 that a large part of the line network is depressurized simply by opening the back pressure valve 54 or 54/2, and that no additional check valves on the intermediate storage 72, 73, 74 are required are.
  • Fig. 1 has the advantage that all controllable valves can be housed centrally in a control cabinet according to functional groups.
  • any number of nozzle bars 6, 7, 8 can be supplied with liquid in metered quantities from a liquid reservoir 11 or 12 with a single metering pump.
  • a particular difficulty with such washing devices is that relatively small amounts of liquid of, for example, only 10 ml over the long lengths of, for example, 1.6 m, the nozzle bars 6, 7, 8 have to be uniformly distributed and evenly sprayed from them. Only such an even distribution of small amounts of liquid over large areas ensures uniform cleaning of all parts over the entire width of the printing unit and thus also uniform printing quality over the entire width of the printing press.
  • controllable liquid valves and compressed air valves can be set to the same or different opening times in both embodiments according to FIGS. 1 and 2. This makes it possible to use the same washing device to moisten several printing unit parts or washcloths simultaneously, in groups or in succession if they require different amounts of liquid, at the same or different times.
  • the counter pressure valve must be used to spray the metered quantity of liquid 54 or 54/2 must be closed so that a back pressure is created in the pipe system.
  • the metering pump 14 or 14/2 When it is started up for the first time, the metering pump 14 or 14/2 first sucks air out of the immersion lance 18, 18/2 before liquid comes from the liquid reservoir 11, 12. To supply a precisely metered amount of liquid to the intermediate stores 72, 73, 74, however, only liquid without air may be contained in the line system between the metering pumps and the intermediate stores 72, 73, 74.
  • the drive piston 22 and the delivery piston 21 go together into their lower position with reference to FIG. 1. All controllable valves 54, 62, 63, 64, 65 or 54/2, 62/2 etc. connected to the distribution line 52 or 52/2 are closed. In the subsequent delivery stroke, the pistons 21 and 22 can only move upward from the lower position with reference to FIG.
  • the delivery plunger 21 is moved a distance corresponding to the desired amount of liquid in the delivery direction, with reference to FIG. 1 upwards.
  • the opening times of the controllable supply valves can be set automatically on the electronic control device 33 by hand or by a program.
  • the delivery pressure of the metering pumps 14 and 14/2 can be set on the pressure reducer 27. If different air pressures are required in different lines, a corresponding number of pressure reducers are required for these lines.
  • the controlled valves 62, 62/2, 63, 63/2, 64, 64/2 for the liquids according to FIG. 2 can be arranged directly on the intermediate store 72, 73, 74, while for the compressed air Check valve 96, 97, 98 according to FIG. 1 is arranged at the upstream end 92 of the intermediate store 72, 73, 74.
  • Another modified embodiment of the invention can consist in that check valves 66, 66/2, 67, 67/2, 68, 68/2 for the liquid accordingly Fig. 1 are arranged, but at the upstream end 92 of the intermediate store 72, 73, 74 as an inlet for compressed air, a controlled valve 106, 107, 108 according to FIG. 2 is arranged instead of the check valves 96, 97, 98.
  • the compressed air supply to the intermediate stores 72, 73, 74 is preferably switched off again immediately when the compressed air column reaches the nozzles 80 of the nozzle bars 6, 7, 8, or when the start the compressed air column is upstream just before the nozzles 80. This prevents the compressed air from disadvantageously mixing with the liquid before or after the nozzles 80.
  • All buffers 72, 73, 74 of FIGS. 1 and 2 are of the same length and their ends 93 form the entrance to the associated nozzle bar 6, 7, 8.
  • the on-off valves are so-called two-position valves.
  • the intermediate stores 72, 73, 74 have no compressed air inlets 96, 97, 98, 106, 107, 108, but rather the metered amount of liquid stored in the intermediate store 72, 73, 74 is replaced by a subsequent metered further amount of liquid from the intermediate store in the associated nozzle bar 6 , 7,8 driven and sprayed out of the latter.
  • two or more such intermediate stores can also be provided.
  • a metering pump 14/2 two or more such metering pumps can also be provided.
  • a liquid supply valve 62, 63, 64, 65, 62/2, 63/2, 64/2 an arrangement of two or more valves can also be used.

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

Claims (6)

  1. Dispositif de lavage de groupe d'impression pour machines d'impression, destiné à appliquer un liquide de lavage sur des parties du groupe d'impression telles que, par exemple, des cylindres de blanchet, des cylindres de plaque, des cylindres d'impression, des rouleaux de transfert de couleur, ou sur un linge de lavage servant au nettoyage mécanique de tels cylindres et rouleaux du groupe d'impression, comprenant :
    - au moins une barre de buses (6, 7, 8) pour pulvériser du liquide sur la partie concernée (1, 2, 3) du groupe d'impression,
    - un réservoir intermédiaire (72, 73, 74) pour chaque barre de buses pour stocker provisoirement une quantité respective dosée du liquide ;
    - une pompe de dosage (14, 14/2) comportant une entrée d'aspiration (15) à pour prélever du liquide depuis un réservoir de liquide (11, 12) et une sortie sous pression (40) pour envoyer une quantité dosée du liquide au réservoir intermédiaire concerné par l'intermédiaire d'une vanne d'alimentation en liquide (62, 63, 64, 65, 62/2, 63/2, 64/2, 65/2)
    - des moyens pour éjecter la quantité de liquide dosée dans le réservoir intermédiaire en direction de la barre de buses et la pulvériser depuis la barre de buses,
       caractérisé en ce que
    les vannes d'alimentation (62, 63, 64, 65, 62/2, 63/2, 64/2, 65/2) sont des vannes ouvert/fermé pilotables à la main ou mécaniquement ;
    sur la liaison de fluide entre la pompe de dosage (14, 14/2) et le ou les réservoirs intermédiaires (72, 73, 74) se trouve une conduite de distribution (52, 52/2, 52/3, 52/4) dont le début amont (50, 50/2) est raccordé en communication de fluide à la sortie (40) de la pompe de dosage (14, 14/2), dont l'extrémité aval (53, 53/2) est munie d'un clapet antiretour (54, 54/2), par l'intermédiaire duquel la conduite de distribution peut alternativement être fermée à cette extrémité ou être ouverte en direction d'une conduite de retour (55, 55/2) conduisant au réservoir de liquide associé (11, 12), et dont la section de conduite de distribution située entre son début (50, 50/2) et son extrémité (53, 53/2) est reliée à chaque fois en communication de fluide, par l'intermédiaire de l'une des vannes d'alimentation (62, 63, 64, 65, 62/2, 63/2, 64/2, 65/2), au réservoir intermédiaire (72, 73, 74) concerné, de telle sorte que, lorsque la vanne de contre-pression est fermée, une pression de liquide est produite dans la conduite de distribution par la pompe de dosage, pression à laquelle s'oppose la vanne de contre-pression (54, 54/2), de sorte que par ouverture d'une ou plusieurs vannes d'alimentation, du liquide est envoyé de la conduite de distribution dans le ou les réservoir(s) intermédiaire(s) (72, 73, 74) concerné(s), alors que, lorsque la vanne de contre-pression est ouverte, l'extrémité de la conduite de distribution est mise hors pression par insertion dans le réservoir de liquide.
  2. Dispositif de lavage de groupe d'impression selon la revendication 1, caractérisé en ce que la pompe de dosage (14, 14/2) est une pompe alternative par laquelle, lorsque les vannes d'alimentation (62, 63..., 62/2, 63/2...) sont fermées et la vanne de contre-pression (54, 54/2) est simultanément fermée, une pression de liquide est établie dans la conduite de distribution (52, 52/2, 52/3, 52/4), pression qui, lorsqu'on ouvre l'une des vannes d'alimentation, provoque un envoi rapide et soudain et liquide de la conduite de distribution vers le réservoir intermédiaire (72, 73, 74) concerné.
  3. Dispositif de lavage de groupe d'impression selon la revendication 1 ou 2, caractérisé en ce qu'un dispositif de commande électronique (33) est prévu, qui comprend un micro-ordinateur et qui commence en fonction d'un programme de lavage la pompe de dosage (14, 14/2), les vannes d'alimentation (62, 63..., 62/2, 63/2...) et la vanne de contre-pression (54, 54/2).
  4. Dispositif de lavage de groupe d'impression selon l'une des revendications 1 à 3, caractérisé en ce que l'extrémité aval (93) des réservoirs intermédiaires (72, 73, 74), qui sont allongés en forme de conduit, est raccordée directement, à chaque fois, directement aux barres de buses (6, 7, 8).
  5. Dispositif de lavage de groupe d'impression selon l'une des revendications 1 à 4, caractérisé en ce que la quantité dosée de liquide stockée dans le réservoir intermédiaire (72, 73, 74) peut être envoyée par une colonne d'air comprimé dans les barres de buses associées lorsque les vannes d'alimentation (62, 63..., 62/2, 63/2...) sont fermées et peut être pulvérisée depuis la barre de buses (6, 7, 8), sans que l'air comprimé de la colonne d'air comprimé se mélange au liquide avant la pulvérisation.
  6. Dispositif de lavage de groupe d'impression selon l'une des revendications 1 à 4, caractérisé en ce que la quantité dosée de liquide stockée dans le réservoir intermédiaire (72, 73, 74) peut être envoyée à chaque fois par une nouvelle quantité dosée suivante de liquide dans les barres de buses (6, 7, 8) associées et être alors pulvérisée par celles-ci.
EP93107263A 1992-05-18 1993-05-05 Dispositif de lavage pour machine à imprimer Expired - Lifetime EP0570763B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4216423 1992-05-18
DE4216423A DE4216423A1 (de) 1992-05-18 1992-05-18 Druckwerks-Waschvorrichtung für Druckmaschinen

Publications (2)

Publication Number Publication Date
EP0570763A1 EP0570763A1 (fr) 1993-11-24
EP0570763B1 true EP0570763B1 (fr) 1997-09-10

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EP93107263A Expired - Lifetime EP0570763B1 (fr) 1992-05-18 1993-05-05 Dispositif de lavage pour machine à imprimer

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EP (1) EP0570763B1 (fr)
DE (2) DE4216423A1 (fr)

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DE19546972A1 (de) * 1995-12-15 1997-06-19 Baldwin Gegenheimer Gmbh Waschanlage einer Maschine der graphischen Industrie
DE29616686U1 (de) * 1996-09-25 1996-11-14 MAN Roland Druckmaschinen AG, 63075 Offenbach Einrichtung zum Beschichten von Bedruckstoffen mit einer Flüssigkeit
US20030007040A1 (en) * 2001-07-03 2003-01-09 Eastman Kodak Company Large volume ink supply system
DE10154430B4 (de) * 2001-11-06 2009-04-02 Manroland Ag Verfahren und Vorrichtung zum Löschen eines Druckbildes auf einer Druckform für eine Druckmaschine
DE202004001174U1 (de) * 2004-01-27 2004-04-08 Man Roland Druckmaschinen Ag Versorgungseinrichtung für eine Reinigungsvorrichtung in einer Verarbeitungsmaschine
DE102004047935B3 (de) * 2004-10-01 2006-01-26 Technotrans Ag Vorrichtung zur Reinigung von Walzenoberflächen in Druckmaschinen
DE502005007747D1 (de) * 2005-05-02 2009-09-03 Baldwin Oxy Dry Gmbh Reinigungssystem für Zylinderoberflächen einer Druckmaschine
DE102006015831A1 (de) * 2006-04-03 2007-10-11 Technotrans Ag Waschvorrichtung für eine Offset-Druckmaschine
DE102007001662B3 (de) * 2007-01-11 2008-07-03 Technotrans Ag Vorrichtung zur Versorgung einer Druckmaschine mit Waschflüssigkeit

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DE1940596C3 (de) * 1969-08-08 1973-10-25 The Johnson Fast Print Machine Corp., Brooklandville, Md. (V.St.A.) Verfahren und Vorrichtung zum Rei nigen und Trocknen einer Bürstenwalze fur den Stoffdruck
DE2826135C2 (de) * 1978-06-15 1982-11-18 Baldwin-Gegenheimer GmbH, 8900 Augsburg Gummituch-Waschvorrichtung
JP2521107B2 (ja) * 1987-09-19 1996-07-31 マツダ株式会社 塗装方法およびその装置
US5005478A (en) * 1987-12-16 1991-04-09 Precision Engineered Systems Inc. Blanket wash system with sub-ambient pressure circulation
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DE69020882T2 (de) * 1990-02-06 1996-03-21 Baldwin Technology Corp System zum Waschen eines Gummituches mit einer Sprühvorrichtung.

Also Published As

Publication number Publication date
DE59307304D1 (de) 1997-10-16
EP0570763A1 (fr) 1993-11-24
DE4216423A1 (de) 1993-11-25

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