EP0738594B1 - Method and device for application of liquids on web sheet material, particularly of printing inks - Google Patents
Method and device for application of liquids on web sheet material, particularly of printing inks Download PDFInfo
- Publication number
- EP0738594B1 EP0738594B1 EP95120627A EP95120627A EP0738594B1 EP 0738594 B1 EP0738594 B1 EP 0738594B1 EP 95120627 A EP95120627 A EP 95120627A EP 95120627 A EP95120627 A EP 95120627A EP 0738594 B1 EP0738594 B1 EP 0738594B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dye
- chamber
- roller
- reservoir
- dyestuff
- 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
Links
- 239000007788 liquid Substances 0.000 title claims description 18
- 239000000463 material Substances 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 15
- 239000000976 ink Substances 0.000 title 1
- 239000000975 dye Substances 0.000 claims description 110
- 238000007789 sealing Methods 0.000 claims description 29
- 239000011248 coating agent Substances 0.000 claims 6
- 238000000576 coating method Methods 0.000 claims 6
- 238000007598 dipping method Methods 0.000 claims 1
- 238000003860 storage Methods 0.000 description 38
- 238000004806 packaging method and process Methods 0.000 description 12
- 239000003973 paint Substances 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 5
- 235000019504 cigarettes Nutrition 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- 238000003848 UV Light-Curing Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000007774 anilox coating Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/02—Ducts, containers, supply or metering devices
- B41F31/027—Ink rail devices for inking ink rollers
Definitions
- the invention relates to a method for applying liquids, in particular dyes, to material webs or blanks, for example color markings on film webs, with a printing unit which has an ink chamber and an ink transfer element, preferably a rotating ink roller, the dye being continuously or temporarily passed through the Ink chamber flows through. Furthermore, the invention relates to a device for performing the method.
- a printing unit is usually used in the packaging machine, which takes dye from a ink chamber with a rotating printing roller and transfers it to a cliché roller. This in turn picks up the dye in the area of a cliché and transfers the specified marking to the film web.
- a printing unit is known from EP-A-0 368 485, in which the ink chamber is connected to a feed line and a discharge line, so that liquid can be passed through the ink chamber.
- the invention has for its object to improve the use of the printing unit in connection with packaging machines or other manufacturing systems so that no malfunctions occur over a long period of operation, in particular due to changes in the dye, leakage or poor dye transfer.
- the method according to the invention is characterized in that the dye is conveyed from one storage container through the ink chamber into another storage container and back again.
- the constant, continuous or cyclical circulation of the dye in a closed circuit ensures that its consistency does not change significantly over a longer period of time.
- the transferability to the film is preserved.
- sealing areas between the (movable) ink application member and the ink chamber are subjected to negative pressure such that any residues of the liquid or the dye are suctioned off continuously or from time to time become.
- This subject of the invention takes into account the fact that material residues can emerge in the region between stationary sealing surfaces on the one hand and on surfaces of the movable, in particular rotating, paint application member that slide against them. These are eliminated by preferably continuous suction in the area of the sealing surfaces of the ink chamber.
- the device according to the invention is designed such that a relatively small ink chamber is connected to a circulation line for the dye.
- the dye circulates continuously or, according to a preferred exemplary embodiment, is conveyed from one storage container into another and back. During this conveying process, the dye runs through the ink chamber.
- the storage containers are alternately pressurized with compressed air and / or connected to a vacuum source.
- the storage containers are provided with tactile and control elements which monitor the emptying and filling process, the reversal of the flow direction and the consumption of dye and trigger the necessary control signals.
- the ink chamber is arranged below the inking roller, so that the rotating inking roller removes the dye from the ink chamber with a lower peripheral region.
- a design of the device which can be used independently is that the rotatingly driven inking roller lies against cylindrical sealing surfaces of the inking chamber. In the area of these sealing surfaces, suction bores open for the removal of any residual amounts of the liquid or the dye.
- FIG. 1 and 2 show a preferred area of application for the method and device for applying color markings 10 to a carrier, in the present case to a film web 11 is a blank 12 for an outer wrapping of a (cigarette) packaging.
- the blank 12 is separated from the film web 11 in the area of a packaging machine (not shown) and then folded around the (cigarette) packaging.
- the film web 11 and thus the blank 12 consist of transparent material.
- the blank 12 In order to open the outer wrapper of the (cigarette) packaging when it is first used, the blank 12 is provided with a tear strip 13. This extends here in the longitudinal direction of the blank 12.
- the tear strip 13 is usually sealed on the inside to the film web 11 or the blank 12.
- the blank 12 To grasp an exposed handle end 14 of the tear strip 13, the blank 12 is provided with a tongue 15 on the free edge.
- the tear strip 13 is also made of transparent material for optical reasons, the handle end 14 is difficult to see.
- the color marking 10 is attached in the region of the handle end 14.
- the elongated, strip-shaped color marking 10 here is rich in contrast. Contrasted with blank 12 and tear strip 13, so that the handle end 14 is easily recognizable.
- the color marking 10 is applied in the area of the packaging machine, that is to say before or during the formation of the blank 12, by a printing unit 16.
- the color marking 10 is applied to the inside of the blank 12 or the film web 11, in the region of the tear strip 13 or the handle end 14.
- the color marking 10 is therefore on the inside of the outer wrapper, that is to say on the blank 12 , and is covered inwardly by the tear strip 13.
- the printing unit 16 is part of a marking unit 17 which is assigned to a packaging machine.
- the film web 11 is fed to the printing unit 16 via deflection rollers 18.
- the color marking 10 in the area of a counter roller 19 on the film web 11 is precisely positioned transfer.
- the film web 11 then passes through a curing unit, in particular a UV curing agent 21, in the area of a horizontal conveyor path 20.
- the dye of the color marking 10, which reacts to UV rays, is cured within a short time by this.
- the film web 11 provided with the color marking 10 then passes via further deflection rollers 22 into the region of a connecting roller 23.
- a continuous strip of material is fed to the outside of the film web 11 as a tear strip 13. This is applied to the film web 11 and connected to the film web 11 in a pack-appropriate position, by sealing or gluing.
- the blanks 12 shown in FIG. 1 are separated from the film web 11 provided with color markings 10 and a continuous tear strip 13 and inserted into the packaging process.
- the dye for the color markings 10 is received in an ink chamber 24 of the printing unit 16.
- the dye is removed from an ink transfer device from the ink chamber 24.
- this is a rotating inking roller 25.
- the inking roller 25 is designed entirely or partially as an anilox roller with small depressions in the ⁇ range.
- the ink layer on the ink roller 25 thus formed is metered by a scraper 26. This is designed as a doctor blade.
- the inking roller 25 is provided with strip-shaped transmission regions 27, that is to say with strip-shaped regions running along the circumference, which are designed in the manner of a grid in the manner described Carry dye.
- the transfer areas 27 are of different widths, namely relatively narrow in the embodiment of FIG. 5 and, in contrast, wide in the embodiment of FIG. 10. The latter can be used for transferring prints of larger format onto plastic or similar print media become.
- the inking roller 25 transfers dye to a further transfer roller arranged above it, namely to a cliché roller 28.
- This is mounted axially parallel to the inking roller 25 and is provided on its circumference with a receiving piece for dye, namely a cliche 29. Size and position of the color marking 10.
- the plate 29 provided with dye is fed to the film web 11 in the region of the counter roller 19.
- the color marking 10 is transferred exactly from the cliché 29 to the film web 11 in terms of size and position.
- the cliché is designed accordingly, so it can also consist of letters.
- the ink chamber 24 is located in an ink tank 30, which is designed here as a block of material. Within the ink tank 24, the ink chamber 24 is designed as a slot or groove-shaped depression or recess that is open at the top. In the exemplary embodiment according to FIGS. 4 and 5, the ink chamber 24 extends as a relatively small recess with a larger dimension in the circumferential direction of the ink roller 25 (FIG. 4). In the axial direction of the ink roller 25, the ink chamber 24 extends centrally to the strip-shaped transfer area 27. As can be seen from FIG. 5, the ink chamber 24 has a significantly smaller width than the transfer area 27 on the ink roller 25.
- Cylindrical sealing surfaces 31 and 32 adjoin the ink chamber 24 on both sides in the circumferential direction of the inking roller 25.
- the sealing surfaces 31, 32 fit snugly against the circumference of the inking roller 25.
- the sealing surface adjoining the ink chamber 24 in the direction of rotation of the inking roller 25 (arrow) 31 has larger dimensions in the direction of rotation than the sealing surface 32 on the input side, that is to say opposite it.
- the inking roller 25 bears against the sealing surfaces 31, 32 almost without a gap.
- the scraper 26 is positioned on the outlet side or on the free end region of the sealing surface 31, specifically in an inclined position relative to the lateral surface of the inking roller 24.
- the block of material for forming the ink container 30 is formed in this area as a web 34 with a reduced width.
- a holding piece 35 with a U-shaped cross section is fitted from above onto the stripper 26 or the web 34, so that 34 support legs extend to both sides of the web.
- Fastening screws 36 which can be actuated from above, pass through these for fastening the holding piece 35 to the paint container 30 or a base thereof.
- the stripper 26 is therefore clamped between the web 34 and the holding web 35.
- An adjusting screw 37 arranged at the end of the scraper 26 serves to readjust or adjust the scraper.
- the ink chamber 24 or the ink container 30 is mounted so that an exact alignment with the inking roller 25 can take place.
- the paint container 30 is adjustably supported on a carrier, namely on a support plate 50 connected to the packaging machine (housing).
- the paint container 30 or its bottom wall is supported on the support plate 50 by means of set screws 38.
- guide bolts 39 are provided which, on the one hand, are connected to the paint container 30 and, on the other hand, absorb the opposing forces via stop disks 40 due to the supporting action of the set screws 38.
- the guide bolts 39 are seated in larger bores of the support plate 50. For the exact setting of the ink container 30 on the inking roller 25, the set screws 38 are accordingly extended or moved back by rotating them.
- the support plate 50 is connected via horizontal connecting bolts 41 to an upright support wall 42 of the machine frame.
- the inking roller 25 and the plate roller 28 are also cantilevered on this support wall 42.
- Another special feature of the device is that the dye flows continuously - or temporarily - through the ink chamber 24. Accordingly, no standing supply of dye, which is constantly decreasing due to consumption, is kept in the ink chamber 24. Rather, the dye is constantly orbiting.
- the dye is continuously conveyed in a closed circuit.
- two storage containers 43, 44 for dye are provided.
- the dye is fed from a storage container 43 via a feed line 45 to the ink chamber 24 and is removed to approximately the same extent via a discharge line 46 from the ink chamber 24.
- the discharge line 46 leads the dye into the other storage container 44. This gradually takes up the total supply of dye, minus the amount currently used.
- a switching process takes place.
- the dye is then conveyed back from the (filled) storage container 44 to the storage container 43, reversing the direction of flow, and always while flowing through the ink chamber 24.
- the flow process in the present exemplary embodiment is effected by a pressure medium, namely compressed air.
- the reservoir 43 which is in each case in the emptying process is connected via an air line 47 to a compressed air source, e.g. connected to a pump P.
- the air line 47 opens into the upper region of the storage container 43, at least above the dye level.
- the overpressure acting on the dye is, for example, 0.3 to 0.7 bar.
- An air line 48 also connects to the storage container 44 in a manner analogous to the storage container 43. This can act as a vent line during the conveyance of the dye from the storage container 43 into the storage container 44. However, an embodiment is particularly advantageous in which the one storage container 43, 44 acting compressed air is supported by negative pressure in the other reservoir 44, 43. In the operating state shown, the air line 48 is accordingly connected to a vacuum source V. This can be, for example, a vacuum pump of the ejector type. Compressed air operated ejector pumps are known in various embodiments as a vacuum pump.
- Both air lines 47, 48 are connected to a slide 49. Depending on the switch position, this causes a connection of one or the other air line 47, 48 to the pump P or to the vacuum source V.
- FIGS. 7 and 8 An advantageous design of the storage containers 43, 44 results from FIGS. 7 and 8.
- the two storage containers 43, 44 are then mounted on a common support plate 51. This is suitably fixedly connected to the machine frame.
- the storage containers 43, 44 can be moved, namely pivoted, independently of one another and are supported on the support plate 51.
- a control signal is derived from the relative position in accordance with the degree of filling of the respective storage container 43, 44.
- a lower support leg 52 projecting on one side is attached in continuation of a bottom wall 53.
- the support leg 52 is connected with its free, angled end to the support plate 51 via a pivot bearing 54.
- the reservoir 43, 44 is pivotable about this pivot bearing 54, namely until it rests against a fixed stop 55 below the bottom wall 53.
- the abutment of the reservoir 43, 44 against this stop 55 defines the lower end position of the reservoir 43, 44 in question when it is complete Filling with dye.
- the reservoir 43, 44 is resiliently, elastically supported on the support plate 51.
- a spring element is arranged in the support plate 51 in the region of each storage container 43, 44 with a compression spring 56 and an adjusting screw 57 for adjusting the spring force.
- the support leg 52 lies in the region of a depression on the compression spring 56.
- the minimum fill level of the storage container 43, 44 is monitored: When a permissible minimum filling is reached, the storage container 43, 44 is raised by the compression spring 56 to such an extent that a sensor is acted upon to generate a signal.
- this is an initiator 58 of a known type, which is attached to the support plate 51 and reacts to changes in distance from the bottom wall 53.
- the storage containers 43, 44 are square in cross section in the present exemplary embodiment (FIG. 7). These are elongated containers, namely tall in relation to the cross-sectional dimensions. Connections 59, 60 and 61 for hose or other lines in the region of an upright side wall 62 of the storage containers 43, 44 are provided for material, compressed air and suction. A connection 59 for the feed line 45 or discharge line 46, that is to say for the dye, is located in the lower region of the storage container 43, 44, directly above the bottom wall 53. The connection 60 serves to connect the air line 47, 48. This connection is located in an upper head piece 63 of the storage container 43, 44.
- the head piece 63 has in the interior of the storage container 43, 44 a pipe socket 64 which projects from above into the storage container 43, 44.
- a perforated base 65 at a distance from the lower mouth, that is to say a transverse plate with bores.
- Filter material 66 for example filter wadding, is accommodated above the same in the area of a filter space of the head piece 43.
- the connection 60 is connected to the inside of the pipe socket 64 in the area of the filter space with the filter material 66. This arrangement is particularly important for the suction process, since any residues of dye through the pipe socket 64 in connection with the filter material 66 in the storage container 43 , 44 retained or cannot get into the air line 47, 48.
- the pipe socket 64 or the space filled with filter material 66 is closed at the top by a cover plate 67.
- the material lines enabling the circulation of the dye connect to the underside of the ink container 30.
- a U-shaped circulation channel 68 is formed within the block-like paint container.
- Upright channel legs 69, 70 lead to a horizontal transverse channel 71. This extends immediately below the ink chamber 24 and is connected to it.
- the transverse channel 71 extends in the transverse axial direction to the inking roller 25.
- the embodiment according to FIGS. 10 and 11 is intended for larger color prints or markings with a correspondingly wide transmission range 27.
- the ink chamber 24 corresponds to these dimensions.
- the ink chamber 24 is therefore positioned as a channel-shaped or groove-shaped structure in an axis-parallel alignment with the inking roller 25.
- the length of the ink chamber 24 in the axial direction is slightly less than the width of the transmission region 27.
- the supply and discharge of the material or the dye takes place here through two parallel color channels 72 and 73, which lead directly from the underside of the ink container 30 to the ends of the elongated ink chamber 24.
- the printing unit 16 is equipped with special measures which can also be used in another context to improve the seal in the area of the ink chamber 24.
- Suction channels 74, 76 open at the cylindrical sealing surfaces 31, 32; 83, 84 for suctioning off dye residues which are carried along by the inking roller 25.
- a central suction channel 74 is provided in the ink tank 30.
- This suction channel 74 is arranged in the region of the sealing surface 31 on the outlet side, specifically adjacent to the free edge of this sealing surface 31, that is to say where the circumference of the inking roller 25 leaves the region of the sealing surface 31.
- the suction channel 74 opens out in the middle of the sealing surface 31 Color residues are absorbed by the suction channel 74 as a result of negative pressure therein.
- a transverse air bore 75 adjacent to the mouth of the suction channel 74 enables external air to be drawn in.
- the suction channel 74 is continuously connected to a vacuum source during the operation of the printing unit 16.
- a further suction channel 76 is formed in the ink container 30 on the opposite side to the ink chamber 24. This opens at the entry-side sealing surface 32, and also adjacent to the free edge thereof. This suction channel 76 also serves to receive and discharge any ink quantities that are still located on the circumference of the inking roller 25 in this area, specifically in the transfer area 27.
- the suction channels 74 and 76 are connected to the storage containers 43, 44 via suction lines 77 and 78, so that the paint residues received by the suction channels 74, 76 are fed to the storage containers 43, 44.
- the suction lines 77, 78 open in the upper region of the storage containers 43, 44, specifically next to the pipe socket 64. As a result, the connections 61 assigned to these suction lines 77, 78 do not come into contact with the supply of dye in the storage container 43, 44.
- the liquid level is kept at a level below the pipe socket 64.
- the negative pressure in the suction lines 77, 78 is generated by the negative pressure prevailing in the respective dye-receiving reservoir 43, 44.
- the suction lines 77, 78 are always connected to the reservoir 43, 44 that is under the influence of negative pressure.
- the suction lines 77, 78 each lead via a slide 79, 80 to the (right) reservoir 44.
- a parallel line 81, 82 assigned to the two suction lines 77, 78 is the slide 79, 80 in this position blocked.
- the (larger) suction channel 74 formed on the outlet side of the sealing surface 31 opens directly below the stripper 26. Quantities of dye stripped from this by the transfer area 27 thus reach the mouth of the suction channel 74 and are discharged in the manner described.
- two suction channels 83, 84 (FIG. 11) arranged at a transverse distance from one another are provided. These lead via separate suction lines or via a common suction line 77, 78 to the respective storage container 43, 44 which is under vacuum.
- the mouths of the suction channels 83, 84 below the scraper 26 are connected to one another by a transverse connecting channel 85.
- the groove-like connecting channel 85 is open to the sealing surface 31 or to the wiper 26, so that amounts of paint removed from the wiper 26 enter the connecting channel 85 and from there into the suction channels 83, 84.
- Air is supplied via an air duct 86 directed transversely to the connecting duct 85 and here centrally adjoining it.
- the block-like paint container 30 is provided with a color groove 87 running all around. This is at the top and is used to collect quantities of paint that have not been recorded.
- the color groove 87 can be emptied in a suitable manner, not shown.
- the guide bolts 39 enter the color groove 87 formed here with a larger width.
Landscapes
- Coating Apparatus (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Printing Methods (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Auftragen von Flüssigkeiten, insbesondere von Farbstoffen, auf Materialbahnen oder Zuschnitte, beispielsweise von Farbmarkierungen auf Folienbahnen, mit einem Druckwerk, das eine Farbkammer und ein Farbübertragungsorgan, vorzugsweise eine drehende Farbwalze aufweist, wobei der Farbstoff ständig oder zeitweilig durch die Farbkammer hindurchfließt. Weiterhin betrifft die Erfindung eine Vorrichtung zum Durchführen des Verfahrens.The invention relates to a method for applying liquids, in particular dyes, to material webs or blanks, for example color markings on film webs, with a printing unit which has an ink chamber and an ink transfer element, preferably a rotating ink roller, the dye being continuously or temporarily passed through the Ink chamber flows through. Furthermore, the invention relates to a device for performing the method.
Bei der Übertragung von flüssigen Substanzen auf Materialbahnen, insbesondere beim Aufbringen von Farbstoffen auf Folienbahnen oder Zuschnitte aus Kunststoff, ist eine Anzahl von Schwierigkeiten zu beachten. Zum einen ist die exakte Dosierung der Farbstoffmenge für die Druckflächen bzw. Farbmarkierungen wichtig. Zum anderen muß dafür Sorge getragen werden, daß auch bei geringem Verbrauch an Farbstoff dessen Konsistenz über einen längeren Zeitraum für den Vorgang des Übertragens erhalten bleibt. Schließlich sind bei bewegbaren Farbübertragungsorganen, insbesondere bei drehenden Farbwalzen, Dichtigkeitsprobleme zu lösen.When transferring liquid substances onto material webs, in particular when applying dyes to film webs or plastic cuts, a number of difficulties have to be considered. On the one hand, the exact dosing of the amount of dye for the printing surfaces or color markings is important. On the other hand, care must be taken to ensure that the consistency of the dye is retained over a longer period of time for the transfer process, even when the amount of dye used is low. Finally, sealing problems have to be solved in the case of movable ink transfer elements, in particular in the case of rotating ink rollers.
Die Schwierigkeiten werden besonders deutlich, wenn kleine Farbmarkierungen auf Folienbahnen für die Außenumhüllung von Zigaretten-Packungen übertragen werden, um das Griffende eines im übrigen durchsichtigen Aufreißstreifens der Folie zu kennzeichnen. Die Farbmarkierung wird dabei üblicherweise nicht auf den Aufreißstreifen, sondern im Bereich des Griffendes desselben auf die (Träger-) Folie aufgedruck.The difficulties become particularly clear when small color markings are transferred to film webs for the outer wrapping of cigarette packs around the end of a handle to mark otherwise transparent tear strip of the film. The color marking is usually not printed on the tear strip, but rather on the (carrier) film in the area of the handle end thereof.
Hierzu findet üblicherweise ein Druckwerk in der Verpackungsmaschine Verwendung, das mit einer drehenden Druckwalze Farbstoff einer Farbkammer entnimmt und auf eine Klischee-Walze überträgt. Diese wiederum nimmt den Farbstoff im Bereich eines Klischees auf und überträgt die vorgegebene Markierung auf die Folienbahn.For this purpose, a printing unit is usually used in the packaging machine, which takes dye from a ink chamber with a rotating printing roller and transfers it to a cliché roller. This in turn picks up the dye in the area of a cliché and transfers the specified marking to the film web.
Aus der EP-A-0 368 485 ist ein Druckwerk bekannt, bei dem die Farbkammer an eine Zuleitung und eine Ableitung angeschlossen ist, so daß Flüssigkeit durch die Farbkammer hindurchführbar ist.A printing unit is known from EP-A-0 368 485, in which the ink chamber is connected to a feed line and a discharge line, so that liquid can be passed through the ink chamber.
Der Erfindung liegt die Aufgabe zugrunde, den Einsatz des Druckwerks im Zusammenhang mit Verpackungsmaschinen oder anderen Fertigungsanlagen so zu verbessern, daß über einen längeren Betrieb hinweg keine Störungen auftreten, insbesondere aufgrund Veränderungen des Farbstoffs, Undichtigkeit oder mangelhafter Farbstoffübertragung. Zur Lösung dieser Aufgabe ist das erfindungsgemäße Verfahren dadurch gekennzeichnet, daß der Farbstoff von einem Vorratsbehälter durch die Farbkammer in einen anderen Vorratsbehälter und wieder zurück gefördert wird.The invention has for its object to improve the use of the printing unit in connection with packaging machines or other manufacturing systems so that no malfunctions occur over a long period of operation, in particular due to changes in the dye, leakage or poor dye transfer. To achieve this object, the method according to the invention is characterized in that the dye is conveyed from one storage container through the ink chamber into another storage container and back again.
Durch den ständigen, kontinuierlichen oder taktweisen Umlauf des Farbstoffes in einem geschlossenen Kreislauf ist gewährleistet, daß sich dessen Konsistenz auch über einen längeren Zeitraum nicht wesentlich verändert. Die Übertragbarkeit auf die Folie bleibt erhalten.The constant, continuous or cyclical circulation of the dye in a closed circuit ensures that its consistency does not change significantly over a longer period of time. The transferability to the film is preserved.
Zur Beseitigung bzw. Berücksichtigung mangelnder Dichtigkeit im Bereich des Druckwerks sind nach einem weiteren Vorschlag der Erfindung Dichtungsbereiche zwischen dem (bewegbaren) Farbauftragsorgan und der Farbkammer mit Unterdruck beaufschlagt, derart, daß etwaige Reste der Flüssigkeit bzw. des Farbstoffs ständig oder von Zeit zu Zeit abgesaugt werden.To eliminate or take into account insufficient tightness in the area of the printing unit, according to a further proposal of the invention, sealing areas between the (movable) ink application member and the ink chamber are subjected to negative pressure such that any residues of the liquid or the dye are suctioned off continuously or from time to time become.
Dieses auch selbständig anwendbare Thema der Erfindung trägt dem Umstand Rechnung, daß im Bereich zwischen ortsfesten Dichtungsflächen einerseits und an diesen gleitend anliegenden Flächen des bewegbaren, insbesondere drehenden Farbauftragsorgans Material reste austreten können. Diese werden durch vorzugsweise ständiges Absaugen im Bereich der Dichtflächen der Farbkammer beseitigt.This subject of the invention, which can also be used independently, takes into account the fact that material residues can emerge in the region between stationary sealing surfaces on the one hand and on surfaces of the movable, in particular rotating, paint application member that slide against them. These are eliminated by preferably continuous suction in the area of the sealing surfaces of the ink chamber.
Die erfindungsgemäße Vorrichtung ist so ausgebildet, daß eine verhältnismäßig kleine Farbkammer an eine Umlaufleitung für den Farbstoff angeschlossen wird. Der Farbstoff läuft ständig um bzw. wird gemäß einem bevorzugten Ausführungsbeispiel von einem Vorratsbehälter in einen anderen gefördert und zurück. Bei diesem Fördervorgang läuft der Farbstoff durch die Farbkammer hindurch. Die Vorratsbehälter werden wechselseitig mit Druckluft beaufschlagt und/oder an eine Unterdruckquelle angeschlossen.The device according to the invention is designed such that a relatively small ink chamber is connected to a circulation line for the dye. The dye circulates continuously or, according to a preferred exemplary embodiment, is conveyed from one storage container into another and back. During this conveying process, the dye runs through the ink chamber. The storage containers are alternately pressurized with compressed air and / or connected to a vacuum source.
Die Vorratsbehälter sind mit Tast- und Kontrollorganen versehen, die den Entleerungs- und Füllvorgang, das Umsteuern der Strömungsrichtung und den Verbrauch an Farbstoff überwachen und die erforderlichen Steuersignale auslösen.The storage containers are provided with tactile and control elements which monitor the emptying and filling process, the reversal of the flow direction and the consumption of dye and trigger the necessary control signals.
Gemäß einem weiteren Merkmal der Erfindung ist die Farbkammer unterhalb der Farbwalze angeordnet, so daß die drehende Farbwalze mit einem unteren Umfangsbereich den Farbstoff aus der Farbkammer entnimmt.According to a further feature of the invention, the ink chamber is arranged below the inking roller, so that the rotating inking roller removes the dye from the ink chamber with a lower peripheral region.
Eine eigenständig anwendbare Ausbildung der Vorrichtung besteht darin, daß die drehend angetriebene Farbwalze an zylinderförmigen Dichtungsflächen der Farbkammer anliegt. Im Bereich dieser Dichtungsflächen münden Saugbohrungen zum Abfördern von etwaigen Restmengen der Flüssigkeit bzw. des Farbstoffs.A design of the device which can be used independently is that the rotatingly driven inking roller lies against cylindrical sealing surfaces of the inking chamber. In the area of these sealing surfaces, suction bores open for the removal of any residual amounts of the liquid or the dye.
Weitere Einzelheiten der Erfindung werden nachfolgend anhand der Zeichnungen näher erläutert. Es zeigt:
- Fig. 1
- einen Zuschnitt einer Außenumhüllung einer (Zigaretten-)Verpackung in ausgebreiteter Stellung,
- Fig. 2
- eine Vorrichtung mit Farbaggregat in schematischer Darstellung, als Teil einer Verpackungsmaschine,
- Fig. 3
- ein Farbaggregat in schematischer Darstellung,
- Fig. 4
- ein Druckwerk als Teil des Farbaggregats in vergrößertem Maßstab, im Vertikalschnitt,
- Fig. 5
- das Druckwerk in einem Vertikalschnitt in der Schnittebene V-V der Fig. 4,
- Fig. 6
- das Druckwerk gemäß Fig. 4 in einer vertikalen Schnittebene VI-VI,
- Fig. 7
- zwei Vorratsbehälter für Farbstoff als Teil des Farbaggregats in Draufsicht,
- Fig. 8
- einen der Vorratsbehälter gemäß Fig. 7 im Vertikalschnitt in einer Schnittebene VIII-VIII der Fig. 7,
- Fig. 9
- ein Druckwerk einer anderen Ausführungsform in einer Darstellung analog Fig. 4,
- Fig. 10
- das Druckwerk gemäß Fig. 9 in einer vertikalen Schnittebene X-X,
- Fig. 11
- das Druckwerk der Fig. 9 in einer versetzten vertikalen Schnittebene XI-XI.
- Fig. 1
- a cut of an outer wrapper of a (cigarette) packaging in the spread position,
- Fig. 2
- a device with inking unit in a schematic representation, as part of a packaging machine,
- Fig. 3
- a color unit in a schematic representation,
- Fig. 4
- a printing unit as part of the ink unit on an enlarged scale, in vertical section,
- Fig. 5
- the printing unit in a vertical section in the section plane VV of Fig. 4,
- Fig. 6
- 4 in a vertical section plane VI-VI,
- Fig. 7
- two storage containers for dye as part of the dye aggregate in top view,
- Fig. 8
- 7 in vertical section in a sectional plane VIII-VIII of FIG. 7,
- Fig. 9
- a printing unit of another embodiment in a representation analogous to FIG. 4,
- Fig. 10
- 9 in a vertical section plane XX,
- Fig. 11
- 9 in a staggered vertical section plane XI-XI.
Fig. 1 und 2 zeigen ein bevorzugtes Einsatzgebiet für Verfahren und Vorrichtung zum Auftragen von Farbmarkierungen 10 auf einen Träger, im vorliegenden Falle auf eine Folienbahn 11. Es handelt sich dabei um einen Zuschnitt 12 für eine Außenumhüllung einer (Zigaretten-)Verpackung. Der Zuschnitt 12 wird im Bereich einer Verpackungsmaschine (nicht gezeigt) von der Folienbahn 11 abgetrennt und dann um die (Zigaretten-)Verpackung herumgefaltet. Die Folienbahn 11 und damit der Zuschnitt 12 bestehen aus durchsichtigem Material.1 and 2 show a preferred area of application for the method and device for applying color markings 10 to a carrier, in the present case to a film web 11 is a blank 12 for an outer wrapping of a (cigarette) packaging. The blank 12 is separated from the film web 11 in the area of a packaging machine (not shown) and then folded around the (cigarette) packaging. The film web 11 and thus the blank 12 consist of transparent material.
Zum Öffnen der Außenumhüllung der (Zigaretten-)Verpackung bei erstmaliger Ingebrauchnahme ist der Zuschnitt 12 mit einem Aufreißstreifen 13 versehen. Dieser erstreckt sich hier in Längsrichtung des Zuschnitts 12. Der Aufreißstreifen 13 ist üblicherweise innenseitig an die Folienbahn 11 bzw. den Zuschnitt 12 angesiegelt. Zum Erfassen eines freiliegenden Griffendes 14 des Aufreißstreifens 13 ist der Zuschnitt 12 mit einer Zunge 15 am freien Rand versehen.In order to open the outer wrapper of the (cigarette) packaging when it is first used, the blank 12 is provided with a tear strip 13. This extends here in the longitudinal direction of the blank 12. The tear strip 13 is usually sealed on the inside to the film web 11 or the blank 12. To grasp an exposed handle end 14 of the tear strip 13, the blank 12 is provided with a tongue 15 on the free edge.
Wenn der Aufreißstreifen 13 aus optischen Gründen ebenfalls aus klarsichtigem Material besteht, ist das Griffende 14 nur schwer erkennbar. Zu diesem Zweck ist die Farbmarkierung 10 im Bereich des Griffendes 14 angebracht. Die hier langgestreckte, streifenförmige Farbmarkierung 10 ist kontrastreich .abgesetzt gegenüber Zuschnitt 12 und Aufreißstreifen 13, so daß das Griffende 14 leicht erkennbar ist.If the tear strip 13 is also made of transparent material for optical reasons, the handle end 14 is difficult to see. For this purpose, the color marking 10 is attached in the region of the handle end 14. The elongated, strip-shaped color marking 10 here is rich in contrast. Contrasted with blank 12 and tear strip 13, so that the handle end 14 is easily recognizable.
Die Farbmarkierung 10 wird im Bereich der Verpackungsmaschine, also vor oder während der Bildung des Zuschnitts 12, durch ein Druckwerk 16 aufgebracht. Im vorliegenden Falle ist die Farbmarkierung 10 an der Innenseite des Zuschnitts 12 bzw. der Folienbahn 11 aufgetragen, im Bereich des Aufreißstreifens 13 bzw. des Griffendes 14. Bei der fertigen Verpackung liegt demnach die Farbmarkierung 10 an der Innenseite der Außenumhüllung, also am Zuschnitt 12, und ist nach innen durch den Aufreißstreifen 13 überdeckt.The color marking 10 is applied in the area of the packaging machine, that is to say before or during the formation of the blank 12, by a printing unit 16. In the present case, the color marking 10 is applied to the inside of the blank 12 or the film web 11, in the region of the tear strip 13 or the handle end 14. In the finished packaging, the color marking 10 is therefore on the inside of the outer wrapper, that is to say on the blank 12 , and is covered inwardly by the tear strip 13.
Das Druckwerk 16 ist Teil eines Markierungs-Aggregats 17, welches einer Verpackungsmaschine zugeordnet ist. Zum Aufbringen der Farbmarkierungen 10 wird die Folienbahn 11 über Umlenkwalzen 18 dem Druckwerk 16 zugeführt. Hier wird die Farbmarkierung 10 im Bereich einer Gegenwalze 19 auf die Folienbahn 11 positionsgenau übertragen. Die Folienbahn 11 durchläuft sodann im Bereich einer horizontalen Förderstrecke 20 ein Aushärt-Aggregat, insbesondere einen UV-Härter 21. Durch diesen wird der auf UV-Strahlen reagierende Farbstoff der Farbmarkierung 10 innerhalb kurzer Zeit ausgehärtet.The printing unit 16 is part of a marking unit 17 which is assigned to a packaging machine. To apply the color markings 10, the film web 11 is fed to the printing unit 16 via deflection rollers 18. Here, the color marking 10 in the area of a counter roller 19 on the film web 11 is precisely positioned transfer. The film web 11 then passes through a curing unit, in particular a UV curing agent 21, in the area of a horizontal conveyor path 20. The dye of the color marking 10, which reacts to UV rays, is cured within a short time by this.
Die mit der Farbmarkierung 10 versehene Folienbahn 11 gelangt sodann über weitere Umlenkwalzen 22 in den Bereich einer Verbindungswalze 23. Auf dem Umfang derselben wird der Außenseite der Folienbahn 11 ein fortlaufender Materialstreifen als Aufreißstreifen 13 zugeführt. Dieser wird an die Folienbahn 11 angelegt und in packungsgerechter Position mit der Folienbahn 11 verbunden, durch Siegeln oder Kleben.The film web 11 provided with the color marking 10 then passes via further deflection rollers 22 into the region of a connecting roller 23. A continuous strip of material is fed to the outside of the film web 11 as a tear strip 13. This is applied to the film web 11 and connected to the film web 11 in a pack-appropriate position, by sealing or gluing.
Von der mit Farbmarkierungen 10 und einem fortlaufenden Aufreißstreifen 13 versehenen Folienbahn 11 werden im Bereich einer Trennstation (nicht gezeigt) die in Fig. 1 gezeigten Zuschnitte 12 nacheinander abgetrennt und in den Verpackungsprozeß eingeführt.In the region of a separating station (not shown), the blanks 12 shown in FIG. 1 are separated from the film web 11 provided with color markings 10 and a continuous tear strip 13 and inserted into the packaging process.
Der Farbstoff für die Farbmarkierungen 10 findet Aufnahme in einer Farbkammer 24 des Druckwerks 16. Der Farbstoff wird von einem Farbübertragungsorgan der Farbkammer 24 entnommen. Im vorliegenden Falle handelt es sich dabei um eine drehende Farbwalze 25. Diese taucht während der Drehbewegung um eine horizontale Achse mit einem Teilbereich des zylindrischen Umfangs von oben her in die Farbkammer 24 und damit in den sich in der Farbkammer 24 befindenden Vorrat an Farbstoff ein. Am Umfang der Farbwalze 25 wird eine Schicht Farbstoff mitgenommen. Die Farbwalze 25 ist zu diesem Zweck ganz oder teilweise als Rasterwalze ausgebildet mit kleinen Vertiefungen im µ-Bereich. Die Farbschicht auf der so ausgebildeten Farbwalze 25 wird durch einen Abstreifer 26 dosiert. Dieser ist als Rakelblech ausgebildet.The dye for the color markings 10 is received in an ink chamber 24 of the printing unit 16. The dye is removed from an ink transfer device from the ink chamber 24. In the present case, this is a rotating inking roller 25. During the rotational movement about a horizontal axis with a partial region of the cylindrical circumference, it dips from above into the ink chamber 24 and thus into the supply of dye located in the ink chamber 24. A layer of dye is taken along the circumference of the ink roller 25. For this purpose, the inking roller 25 is designed entirely or partially as an anilox roller with small depressions in the μ range. The ink layer on the ink roller 25 thus formed is metered by a scraper 26. This is designed as a doctor blade.
Bei den vorliegenden Ausführungsbeispielen ist die Farbwalze 25 mit streifenförmigen Übertragungsbereichen 27 versehen, also mit längs des Umfangs verlaufenden streifenförmigen Bereichen, die in der beschriebenen Weise rasterartig ausgebildet sind, um Farbstoff mitzuführen. Je nach dem zu erzeugenden Druckbild sind die Übertragungsbereiche 27 von unterschiedlicher Breite, nämlich verhältnismäßig schmal bei dem Ausführungsbeispiel der Fig. 5 und demgegenüber breit bei dem Ausführungsbeispiel der Fig. 10. Letzteres kann zur Übertragung von Drucken größeren Formats auf Druckträger aus Kunststoff oder dergleichen eingesetzt werden.In the present exemplary embodiments, the inking roller 25 is provided with strip-shaped transmission regions 27, that is to say with strip-shaped regions running along the circumference, which are designed in the manner of a grid in the manner described Carry dye. Depending on the print image to be generated, the transfer areas 27 are of different widths, namely relatively narrow in the embodiment of FIG. 5 and, in contrast, wide in the embodiment of FIG. 10. The latter can be used for transferring prints of larger format onto plastic or similar print media become.
Die Farbwalze 25 überträgt im vorliegenden Falle Farbstoff auf eine weitere, darüber angeordnete Übertragungswalze, nämlich auf eine Klischeewalze 28. Diese ist achsparallel zur Farbwalze 25 gelagert und an ihrem Umfang mit einem Aufnahmestück für Farbstoff versehen, nämlich einem Klischee 29. Dieses entspricht in Form, Größe und Position der Farbmarkierung 10. Infolge der Drehbewegung der Klischeewalze 28 wird das mit Farbstoff versehene Klischee 29 der Folienbahn 11 im Bereich der Gegenwalze 19 zugeführt. Die Farbmarkierung 10 wird nach Größe und Position exakt von dem Klischee 29 auf die Folienbahn 11 übertragen. Bei anderen herzustellenden Drucken ist das Klischee entsprechend ausgebildet, kann also auch aus Buchstaben bestehen.In the present case, the inking roller 25 transfers dye to a further transfer roller arranged above it, namely to a cliché roller 28. This is mounted axially parallel to the inking roller 25 and is provided on its circumference with a receiving piece for dye, namely a cliche 29. Size and position of the color marking 10. As a result of the rotary movement of the plate roller 28, the plate 29 provided with dye is fed to the film web 11 in the region of the counter roller 19. The color marking 10 is transferred exactly from the cliché 29 to the film web 11 in terms of size and position. In the case of other prints to be produced, the cliché is designed accordingly, so it can also consist of letters.
Die Farbkammer 24 befindet sich in einem hier als Materialblock ausgebildeten Farbbehälter 30. Innerhalb desselben ist die Farbkammer 24 als nach oben offene schlitz- oder nutförmige Vertiefung oder Ausnehmung ausgebildet. Bei dem Ausführungsbeispiel gemäß Fig. 4 und Fig. 5 erstreckt sich die Farbkammer 24 als verhältnismäßig kleine Ausnehmung mit einer größeren Abmessung in Umfangsrichtung der Farbwalze 25 (Fig. 4). In Axialrichtung der Farbwalze 25 erstreckt sich die Farbkammer 24 mittig zum streifenförmigen Übertragungsbereich 27. Wie aus Fig. 5 ersichtlich, hat die Farbkammer 24 eine deutlich geringere Breite als der Übertragungsbereich 27 auf der Farbwalze 25.The ink chamber 24 is located in an ink tank 30, which is designed here as a block of material. Within the ink tank 24, the ink chamber 24 is designed as a slot or groove-shaped depression or recess that is open at the top. In the exemplary embodiment according to FIGS. 4 and 5, the ink chamber 24 extends as a relatively small recess with a larger dimension in the circumferential direction of the ink roller 25 (FIG. 4). In the axial direction of the ink roller 25, the ink chamber 24 extends centrally to the strip-shaped transfer area 27. As can be seen from FIG. 5, the ink chamber 24 has a significantly smaller width than the transfer area 27 on the ink roller 25.
In Umfangsrichtung der Farbwalze 25 schließen zu beiden Seiten an die Farbkammer 24 zylindrisch geformte Dichtungsflächen 31 und 32 an. Die Dichtungsflächen 31, 32 schmiegen sich passend an den Umfang der Farbwalze 25 an. Die in Drehrichtung der Farbwalze 25 (Pfeil) an die Farbkammer 24 anschließende Dichtungsfläche 31 hat größere Abmessungen in Drehrichtung als die eingangsseitige, also gegenüberliegende Dichtungsfläche 32. Die Farbwalze 25 liegt nahezu spaltfrei an den Dichtungsflächen 31, 32 an.Cylindrical sealing surfaces 31 and 32 adjoin the ink chamber 24 on both sides in the circumferential direction of the inking roller 25. The sealing surfaces 31, 32 fit snugly against the circumference of the inking roller 25. The sealing surface adjoining the ink chamber 24 in the direction of rotation of the inking roller 25 (arrow) 31 has larger dimensions in the direction of rotation than the sealing surface 32 on the input side, that is to say opposite it. The inking roller 25 bears against the sealing surfaces 31, 32 almost without a gap.
Der Abstreifer 26 ist an der Austrittsseite bzw. am freien Endbereich der Dichtungsfläche 31 positioniert, und zwar in einer Schrägstellung zur Mantelfläche der Farbwalze 24. Wie aus Fig. 4 und 6 ersichtlich, liegt der Abstreifer 26 auf einer schräggerichteten Stützfläche 33 des Farbbehälters 30. Der Materialblock zur Bildung des Farbbehälters 30 ist in diesem Bereich als Steg 34 mit verminderter Breite ausgebildet. Ein im Querschnitt U-förmig ausgebildetes Haltestück 35 ist von oben her auf den Abstreifer 26 bzw. den Steg 34 aufgesetzt, so daß sich zu beiden Seiten des Stegs 34 Stützschenkel erstrecken. Durch diese treten von oben her betätigbare Befestigungsschrauben 36 hindurch zur Befestigung des Haltestücks 35 am Farbbehälter 30 bzw. einem Sockel desselben. Der Abstreifer 26 ist demnach zwischen Steg 34 und Haltesteg 35 verspannt. Zum Nachstellen bzw. Justieren des Abstreifers 26 dient eine am Ende desselben angeordnete Justierschraube 37.The scraper 26 is positioned on the outlet side or on the free end region of the sealing surface 31, specifically in an inclined position relative to the lateral surface of the inking roller 24. As can be seen from FIGS. The block of material for forming the ink container 30 is formed in this area as a web 34 with a reduced width. A holding piece 35 with a U-shaped cross section is fitted from above onto the stripper 26 or the web 34, so that 34 support legs extend to both sides of the web. Fastening screws 36, which can be actuated from above, pass through these for fastening the holding piece 35 to the paint container 30 or a base thereof. The stripper 26 is therefore clamped between the web 34 and the holding web 35. An adjusting screw 37 arranged at the end of the scraper 26 serves to readjust or adjust the scraper.
Die Farbkammer 24 bzw. der Farbbehälter 30 ist so gelagert, daß eine exakte Ausrichtung auf die Farbwalze 25 erfolgen kann. Im vorliegenden Fall ist zu diesem Zweck der Farbbehälter 30 insgesamt verstellbar auf einem Träger gelagert, nämlich auf einer mit der Verpackungsmaschine (Gehäuse) verbundenen Tragplatte 50. Der Farbbehälter 30 bzw. dessen Bodenwand ist über Stellschrauben 38 auf der Tragplatte 50 abgestützt. Zusätzlich sind Führungsbolzen 39 vorgesehen, die einerseits mit dem Farbbehälter 30 verbunden und andererseits über Anschlagscheiben 40 die Gegenkräfte aufgrund der Stützwirkung der Stellschrauben 38 auffangen. Die Führungsbolzen 39 sitzen in größeren Bohrungen der Tragplatte 50. Zum exakten Einstellen des Farbbehälters 30 auf die Farbwalze 25 werden demnach die Stellschrauben 38 durch Drehen nach oben ausgefahren oder zurückbewegt.The ink chamber 24 or the ink container 30 is mounted so that an exact alignment with the inking roller 25 can take place. In the present case, for this purpose, the paint container 30 is adjustably supported on a carrier, namely on a support plate 50 connected to the packaging machine (housing). The paint container 30 or its bottom wall is supported on the support plate 50 by means of set screws 38. In addition, guide bolts 39 are provided which, on the one hand, are connected to the paint container 30 and, on the other hand, absorb the opposing forces via stop disks 40 due to the supporting action of the set screws 38. The guide bolts 39 are seated in larger bores of the support plate 50. For the exact setting of the ink container 30 on the inking roller 25, the set screws 38 are accordingly extended or moved back by rotating them.
Die Tragplatte 50 ist über horizontale Verbindungsbolzen 41 mit einer aufrechten Tragwand 42 des Maschinengestells verbunden.The support plate 50 is connected via horizontal connecting bolts 41 to an upright support wall 42 of the machine frame.
An dieser Tragwand 42 sind auch einseitig auskragend die Farbwalze 25 und die Klischeewalze 28 gelagert.The inking roller 25 and the plate roller 28 are also cantilevered on this support wall 42.
Eine weitere Besonderheit der Vorrichtung besteht darin, daß der Farbstoff ständig - oder zeitweilig - durch die Farbkammer 24 hindurchströmt. Es wird demnach kein stehender, durch den Verbrauch ständig abnehmender Vorrat an Farbstoff in der Farbkammer 24 bereitgehalten. Vielmehr ist der Farbstoff ständig in einer Umlaufbewegung.Another special feature of the device is that the dye flows continuously - or temporarily - through the ink chamber 24. Accordingly, no standing supply of dye, which is constantly decreasing due to consumption, is kept in the ink chamber 24. Rather, the dye is constantly orbiting.
Bei dem gezeigten Ausführungsbeispiel wird der Farbstoff in einem geschlossenen Kreislauf ständig umgefördert. Zu diesem Zweck sind zwei Vorratsbehälter 43, 44 für Farbstoff vorgesehen. Der Farbstoff wird aus dem einen Vorratsbehälter 43 über eine Zuleitung 45 der Farbkammer 24 zugeführt und in etwa gleichem Umfange über eine Ableitung 46 der Farbkammer 24 wieder entnommen. Die Ableitung 46 führt den Farbstoff in den anderen Vorratsbehälter 44. Dieser nimmt nach und nach den Gesamtvorrat an Farbstoff auf, abzüglich der laufend verbrauchten Menge. Nach Entleerung des Vorratsbehälter 43 erfolgt ein Umschaltvorgang. Der Farbstoff wird sodann aus dem (gefüllten) Vorratsbehälter 44 unter Umkehrung der Strömungsrichtung in den Vorratsbehälter 43 zurückgefördert, und zwar stets unter Durchströmung der Farbkammer 24.In the exemplary embodiment shown, the dye is continuously conveyed in a closed circuit. For this purpose, two storage containers 43, 44 for dye are provided. The dye is fed from a storage container 43 via a feed line 45 to the ink chamber 24 and is removed to approximately the same extent via a discharge line 46 from the ink chamber 24. The discharge line 46 leads the dye into the other storage container 44. This gradually takes up the total supply of dye, minus the amount currently used. After the storage container 43 has been emptied, a switching process takes place. The dye is then conveyed back from the (filled) storage container 44 to the storage container 43, reversing the direction of flow, and always while flowing through the ink chamber 24.
Der Strömungsvorgang wird bei dem vorliegenden Ausführungsbeispiel durch ein Druckmedium, nämlich Druckluft, bewirkt. Der sich jeweils im Entleerungsprozeß befindende Vorratsbehälter 43 ist über eine Luftleitung 47 mit einer Druckluftquelle, z.B. einer Pumpe P verbunden. Die Luftleitung 47 mündet im oberen Bereich des Vorratsbehälters 43, jedenfalls oberhalb des Farbstoffpegels. Der auf den Farbstoff wirkende Überdruck beträgt beispielsweise 0,3 bis 0,7 bar.The flow process in the present exemplary embodiment is effected by a pressure medium, namely compressed air. The reservoir 43 which is in each case in the emptying process is connected via an air line 47 to a compressed air source, e.g. connected to a pump P. The air line 47 opens into the upper region of the storage container 43, at least above the dye level. The overpressure acting on the dye is, for example, 0.3 to 0.7 bar.
Auch an den Vorratsbehälter 44 schließt analog zum Vorratsbehälter 43 eine Luftleitung 48 an. Diese kann während der Förderung des Farbstoffs vom Vorratsbehälters 43 in den Vorratsbehälter 44 als Entlüftungsleitung wirken. Besonders vorteilhaft ist aber eine Ausführung, bei der die auf den einen Vorratsbehälter 43, 44 wirkende Druckluft durch Unterdruck im anderen Vorratsbehälter 44, 43 unterstützt wird. Bei dem gezeigten Betriebszustand ist demnach die Luftleitung 48 an eine Vakuumquelle V angeschlossen. Bei dieser kann es sich beispielsweise um eine Vakuumpumpe des Typs Ejektorpumpe handeln. Druckluftbetriebene Ejektorpumpen sind in verschiedenen Ausführungsformen als Vakuumpumpe bekannt.An air line 48 also connects to the storage container 44 in a manner analogous to the storage container 43. This can act as a vent line during the conveyance of the dye from the storage container 43 into the storage container 44. However, an embodiment is particularly advantageous in which the one storage container 43, 44 acting compressed air is supported by negative pressure in the other reservoir 44, 43. In the operating state shown, the air line 48 is accordingly connected to a vacuum source V. This can be, for example, a vacuum pump of the ejector type. Compressed air operated ejector pumps are known in various embodiments as a vacuum pump.
Beide Luftleitungen 47, 48 sind mit einem Schieber 49 verbunden. Dieser bewirkt je nach Schaltstellung eine Verbindung der einen oder anderen Luftleitung 47, 48 mit der Pumpe P oder mit der Vakuumquelle V.Both air lines 47, 48 are connected to a slide 49. Depending on the switch position, this causes a connection of one or the other air line 47, 48 to the pump P or to the vacuum source V.
Eine vorteilhafte Gestaltung der Vorratsbehälter 43, 44 ergibt sich aus Fig. 7 und 8. Die beiden Vorratsbehälter 43, 44 sind danach auf einer gemeinsamen Stützplatte 51 gelagert. Diese ist in geeigneter Weise feststehend mit dem Maschinengestell verbunden. Die Vorratsbehälter 43, 44 sind unabhängig voneinander bewegbar, nämlich schwenkbar, auf der Stützplatte 51 gelagert. Aus der Relativstellung wird ein Steuersignal nach Maßgabe des Füllgrades des jeweiligen Vorratsbehälters 43, 44 abgeleitet.An advantageous design of the storage containers 43, 44 results from FIGS. 7 and 8. The two storage containers 43, 44 are then mounted on a common support plate 51. This is suitably fixedly connected to the machine frame. The storage containers 43, 44 can be moved, namely pivoted, independently of one another and are supported on the support plate 51. A control signal is derived from the relative position in accordance with the degree of filling of the respective storage container 43, 44.
An jedem der langgestreckten Vorratsbehälter 43, 44 ist ein einseitig abstehender unterer Stützschenkel 52 in Fortsetzung einer Bodenwand 53 angebracht. Der Stützschenkel 52 ist mit seinem freien, abgewinkelten Ende über ein Schwenklager 54 mit der Stützplatte 51 verbunden. Der Vorratsbehälter 43, 44 ist um dieses Schwenklager 54 schwenkbar, und zwar bis zur Anlage an einem feststehenden Anschlag 55 unterhalb der Bodenwand 53. Die Anlage des Vorratsbehälters 43, 44 an diesem Anschlag 55 definiert die untere Endstellung des betreffenden Vorratsbehälters 43, 44 bei vollständiger Füllung mit Farbstoff.On each of the elongated storage containers 43, 44 a lower support leg 52 projecting on one side is attached in continuation of a bottom wall 53. The support leg 52 is connected with its free, angled end to the support plate 51 via a pivot bearing 54. The reservoir 43, 44 is pivotable about this pivot bearing 54, namely until it rests against a fixed stop 55 below the bottom wall 53. The abutment of the reservoir 43, 44 against this stop 55 defines the lower end position of the reservoir 43, 44 in question when it is complete Filling with dye.
Der Vorratsbehälter 43, 44 ist federnd, elastisch auf der Stützplatte 51 abgestützt. Im vorliegenden Falle ist in der Stützplatte 51 im Bereich jedes Vorratsbehälters 43, 44 ein Federelement angeordnet mit einer Druckfeder 56 und einer Stellschraube 57 zur Einstellung der Federkraft. Der Stützschenkel 52 liegt im Bereich einer Vertiefung auf der Druckfeder 56.The reservoir 43, 44 is resiliently, elastically supported on the support plate 51. In the present case, a spring element is arranged in the support plate 51 in the region of each storage container 43, 44 with a compression spring 56 and an adjusting screw 57 for adjusting the spring force. The support leg 52 lies in the region of a depression on the compression spring 56.
Hierdurch wird der minimale Füllstand des Vorratsbehälters 43, 44 überwacht: Bei Erreichen einer zulässigen Minimalfüllung wird der Vorratsbehälter 43, 44 durch die Druckfeder 56 soweit angehoben, daß ein Sensor zur Erzeugung eines Signals beaufschlagt ist. Bei diesem handelt es sich im vorliegenden Falle um einen Initiator 58 bekannter Bauart, der an der Stützplatte 51 angebracht ist und auf Abstandsveränderungen gegenüber der Bodenwand 53 reagiert.As a result, the minimum fill level of the storage container 43, 44 is monitored: When a permissible minimum filling is reached, the storage container 43, 44 is raised by the compression spring 56 to such an extent that a sensor is acted upon to generate a signal. In the present case, this is an initiator 58 of a known type, which is attached to the support plate 51 and reacts to changes in distance from the bottom wall 53.
Die Vorratsbehälter 43, 44 sind bei dem vorliegenden Ausführungsbeispiel im Querschnitt quadratisch (Fig. 7). Es handelt sich dabei um langgestreckte, nämlich im Verhältnis zu den Querschnittsabmessungen hohe Behälter. Für Material, Druckluft und Absaugung sind Anschlüsse 59, 60 und 61 für Schlauch- oder sonstige Leitungen im Bereich einer aufrechten Seitenwand 62 der Vorratsbehälter 43, 44 vorgesehen. Ein Anschluß 59 für die Zuleitung 45 bzw. Ableitung 46, also für den Farbstoff, befindet sich im unteren Bereich des Vorratsbehälters 43, 44, unmittelbar oberhalb der Bodenwand 53. Der Anschluß 60 dient zum Anschluß der Luftleitung 47, 48. Dieser Anschluß befindet sich in einem oberen Kopfstück 63 des Vorratsbehälters 43, 44. Das Kopfstück 63 weist im Inneren des Vorratsbehälters 43, 44 einen Rohrstutzen 64 auf, der von oben her in den Vorratsbehälter 43, 44 ragt. Im Rohrstutzen befindet sich mit Abstand von der unteren Mündung ein Lochboden 65, also eine quergerichtete Platte mit Bohrungen. Oberhalb derselben ist im Bereich eines Filterraums des Kopfstücks 43 Filtermaterial 66 untergebracht, zum Beispiel Filterwatte. Der Anschluß 60 ist mit dem Inneren des Rohrstutzens 64 verbunden im Bereich des Filterraums mit dem Filtermaterial 66. Diese Anordnung ist insbesondere für den Vorgang des Absaugens von Bedeutung, da etwaige Reste an Farbstoff durch den Rohrstutzen 64 in Verbindung mit dem Filtermaterial 66 im Vorratsbehälter 43, 44 zurückgehalten bzw. nicht in die Luftleitung 47, 48 gelangen können.The storage containers 43, 44 are square in cross section in the present exemplary embodiment (FIG. 7). These are elongated containers, namely tall in relation to the cross-sectional dimensions. Connections 59, 60 and 61 for hose or other lines in the region of an upright side wall 62 of the storage containers 43, 44 are provided for material, compressed air and suction. A connection 59 for the feed line 45 or discharge line 46, that is to say for the dye, is located in the lower region of the storage container 43, 44, directly above the bottom wall 53. The connection 60 serves to connect the air line 47, 48. This connection is located in an upper head piece 63 of the storage container 43, 44. The head piece 63 has in the interior of the storage container 43, 44 a pipe socket 64 which projects from above into the storage container 43, 44. In the pipe socket there is a perforated base 65 at a distance from the lower mouth, that is to say a transverse plate with bores. Filter material 66, for example filter wadding, is accommodated above the same in the area of a filter space of the head piece 43. The connection 60 is connected to the inside of the pipe socket 64 in the area of the filter space with the filter material 66. This arrangement is particularly important for the suction process, since any residues of dye through the pipe socket 64 in connection with the filter material 66 in the storage container 43 , 44 retained or cannot get into the air line 47, 48.
Der Rohrstutzen 64 bzw. der mit Filtermaterial 66 gefüllte Raum ist oben durch eine Deckelplatte 67 verschlossen.The pipe socket 64 or the space filled with filter material 66 is closed at the top by a cover plate 67.
Die den Umlauf des Farbstoffs ermöglichenden Material leitungen, nämlich Zuleitung 45 und Ableitung 46, schließen an der Unterseite des Farbbehälters 30 an diesen an. Innerhalb des blockartigen Farbbehälters ist ein im vorliegenden Falle U-förmiger Umlaufkanal 68 gebildet. Aufrechte Kanalschenkel 69, 70 führen zu einem horizontalen Querkanal 71. Dieser erstreckt sich unmittelbar unterhalb der Farbkammer 24 und ist mit dieser verbunden. Der Querkanal 71 erstreckt sich hierbei in queraxialer Richtung zur Farbwalze 25.The material lines enabling the circulation of the dye, namely supply line 45 and discharge line 46, connect to the underside of the ink container 30. In the present case, a U-shaped circulation channel 68 is formed within the block-like paint container. Upright channel legs 69, 70 lead to a horizontal transverse channel 71. This extends immediately below the ink chamber 24 and is connected to it. The transverse channel 71 extends in the transverse axial direction to the inking roller 25.
Die Ausführungsform gemäß Fig. 10 und 11 ist für größere Farbdrucke bzw. Markierungen bestimmt mit einem entsprechend breiten Übertragungsbereich 27. Die Farbkammer 24 entspricht diesen Abmessungen. Die Farbkammer 24 ist deshalb bei diesem Ausführungsbeispiel als kanal- bzw. nutförmiges Gebilde in einer achsparallelen Ausrichtung zur Farbwalze 25 positioniert. Die Länge der Farbkammer 24 in Axialrichtung ist geringfügig kleiner als die Breite des Übertragungsbereichs 27.The embodiment according to FIGS. 10 and 11 is intended for larger color prints or markings with a correspondingly wide transmission range 27. The ink chamber 24 corresponds to these dimensions. In this exemplary embodiment, the ink chamber 24 is therefore positioned as a channel-shaped or groove-shaped structure in an axis-parallel alignment with the inking roller 25. The length of the ink chamber 24 in the axial direction is slightly less than the width of the transmission region 27.
Die Zuführung und Ableitung des Materials bzw. des Farbstoffs erfolgt hier durch zwei parallele Farbkanäle 72 und 73, die von der Unterseite des Farbbehälters 30 unmittelbar zu den Enden der langgestreckten Farbkammer 24 führen.The supply and discharge of the material or the dye takes place here through two parallel color channels 72 and 73, which lead directly from the underside of the ink container 30 to the ends of the elongated ink chamber 24.
Das Druckwerk 16 ist mit besonderen, auch in einem anderen Zusammenhang einsetzbaren Maßnahmen zur Verbesserung der Abdichtung im Bereich der Farbkammer 24 ausgestattet. An den zylindrischen Dichtungsflächen 31, 32 münden Saugkanäle 74, 76; 83, 84 zum Absaugen von Farbstoffrückständen, die durch die Farbwalze 25 mitgenommen werden.The printing unit 16 is equipped with special measures which can also be used in another context to improve the seal in the area of the ink chamber 24. Suction channels 74, 76 open at the cylindrical sealing surfaces 31, 32; 83, 84 for suctioning off dye residues which are carried along by the inking roller 25.
Bei einem Farbwerk mit schmalem Übertragungsbereich 27 der Farbwalze 25, also bei dem Ausführungsbeispiel der Fig. 4 bis Fig. 6, ist ein mittiger Saugkanal 74 im Farbbehälter 30 vorgesehen. Dieser Saugkanal 74 ist im Bereich der austrittsseitigen Dichtungsfläche 31 angeordnet, und zwar benachbart zum freien Rand dieser Dichtungsfläche 31, also dort, wo der Umfang der Farbwalze 25 den Bereich der Dichtungsfläche 31 verläßt. Der Saugkanal 74 mündet mittig an der Dichtungsfläche 31. Dort anfallende Farbrückstände werden von dem Saugkanal 74 infolge von Unterdruck in diesem aufgenommen. Eine quergerichtete Luftbohrung 75 benachbart zur Mündung des Saugkanals 74 ermöglicht das Ansaugen von Fremdluft. Der Saugkanal 74 ist während des Betriebs des Druckwerks 16 ständig an eine Unterdruckquelle angeschlossen.In the case of an inking unit with a narrow transmission area 27 of the inking roller 25, that is to say in the embodiment of FIGS. 4 to 6, a central suction channel 74 is provided in the ink tank 30. This suction channel 74 is arranged in the region of the sealing surface 31 on the outlet side, specifically adjacent to the free edge of this sealing surface 31, that is to say where the circumference of the inking roller 25 leaves the region of the sealing surface 31. The suction channel 74 opens out in the middle of the sealing surface 31 Color residues are absorbed by the suction channel 74 as a result of negative pressure therein. A transverse air bore 75 adjacent to the mouth of the suction channel 74 enables external air to be drawn in. The suction channel 74 is continuously connected to a vacuum source during the operation of the printing unit 16.
Zusätzlich ist im vorliegenden Falle auf der gegenüberliegenden Seite zur Farbkammer 24 ein weiterer Saugkanal 76 im Farbbehälter 30 gebildet. Dieser mündet an der eintrittsseitigen Dichtfläche 32, und zwar ebenfalls benachbart zum freien Rand derselben. Auch dieser Saugkanal 76 dient zur Aufnahme und Abführung etwaiger Farbmengen, die sich in diesem Bereich noch am Umfang der Farbwalze 25 befinden, und zwar im Übertragungsbereich 27.In addition, in the present case, a further suction channel 76 is formed in the ink container 30 on the opposite side to the ink chamber 24. This opens at the entry-side sealing surface 32, and also adjacent to the free edge thereof. This suction channel 76 also serves to receive and discharge any ink quantities that are still located on the circumference of the inking roller 25 in this area, specifically in the transfer area 27.
Die Saugkanäle 74 und 76 sind über Saugleitungen 77 und 78 mit den Vorratsbehältern 43, 44 verbunden, so daß die von den Saugkanälen 74, 76 aufgenommenen Farbreste den Vorratsbehältern 43, 44 zugeführt werden. Die Saugleitungen 77, 78 münden im oberen Bereich der Vorratsbehälter 43, 44, und zwar neben dem Rohrstutzen 64. Dadurch kommen die diesen Saugleitungen 77, 78 zugeordneten Anschlüsse 61 nicht mit dem Vorrat an Farbstoff im Vorratsbehälter 43, 44 in Berührung. Der Flüssigkeitspegel wird auf einem Niveau unterhalb des Rohrstutzen 64 gehalten.The suction channels 74 and 76 are connected to the storage containers 43, 44 via suction lines 77 and 78, so that the paint residues received by the suction channels 74, 76 are fed to the storage containers 43, 44. The suction lines 77, 78 open in the upper region of the storage containers 43, 44, specifically next to the pipe socket 64. As a result, the connections 61 assigned to these suction lines 77, 78 do not come into contact with the supply of dye in the storage container 43, 44. The liquid level is kept at a level below the pipe socket 64.
Vorzugsweise bzw. bei dem dargestellten Ausführungsbeispiel wird der Unterdruck in den Saugleitungen 77, 78 durch den im jeweils farbstoffaufnehmenden Vorratsbehälter 43, 44 herrschenden Unterdruck erzeugt. Dies bedeutet, daß die Saugleitungen 77, 78 stets an denjenigen Vorratsbehälter 43, 44 angeschlossen sind, der unter dem Einfluß von Unterdruck steht. Bei dem dargestellten Ausführungsbeispiel (Fig. 3) führen die Saugleitungen 77, 78 jeweils über einen Schieber 79, 80 zum (rechten) Vorratsbehälter 44. Eine den beiden Saugleitungen 77, 78 zugeordnete Parallelleitung 81, 82 ist bei dieser Stellung der Schieber 79, 80 gesperrt. Wenn die Strömungsrichtung der Flüssigkeit umgeschaltet wird, wenn demnach der Farbstoff vom Vorratsbehälter 44 zum Vorratsbehälter 43 strömt, werden auch die Schieber 79, 80 umgestellt. Es herrscht dann im Vorratsbehälter 43 Unterdruck. Die Saugleitungen 77, 78 sind über die dann freien Parallelleitungen 81, 82 mit dem Vorratsbehälter 43 verbunden, so daß etwaige Farbreste in diesen gelangen.Preferably or in the illustrated embodiment, the negative pressure in the suction lines 77, 78 is generated by the negative pressure prevailing in the respective dye-receiving reservoir 43, 44. This means that the suction lines 77, 78 are always connected to the reservoir 43, 44 that is under the influence of negative pressure. In the exemplary embodiment shown (FIG. 3), the suction lines 77, 78 each lead via a slide 79, 80 to the (right) reservoir 44. A parallel line 81, 82 assigned to the two suction lines 77, 78 is the slide 79, 80 in this position blocked. When the flow direction of the liquid is switched, when the dye flows from the reservoir 44 to the reservoir 43, so too Slider 79, 80 changed. There is then 43 negative pressure in the reservoir. The suction lines 77, 78 are connected to the reservoir 43 via the then free parallel lines 81, 82, so that any paint residues get into it.
Der an der Austrittsseite der Dichtfläche 31 gebildete (größere) Saugkanal 74 mündet unmittelbar unterhalb des Abstreifers 26. Von diesem vom Übertragungsbereich 27 abgestreifte Farbstoffmengen gelangen so unmittelbar in die Mündung des Saugkanals 74 und werden in der beschriebenen Weise abgeleitet.The (larger) suction channel 74 formed on the outlet side of the sealing surface 31 opens directly below the stripper 26. Quantities of dye stripped from this by the transfer area 27 thus reach the mouth of the suction channel 74 and are discharged in the manner described.
Bei dem Ausführungsbeispiel gemäß Fig. 9, 10 und 11 mit einem breiten Übertragungsbereich 27 sind zwei im Querabstand voneinander angeordnete Saugkanäle 83, 84 (Fig. 11) vorgesehen. Diese führen über separate Saugleitungen oder über eine gemeinsame Saugleitung 77, 78 zum jeweils unter Unterdruck stehenden Vorratsbehälter 43, 44. Die Mündungen der Saugkanäle 83, 84 unterhalb des Abstreifers 26 sind durch einen quergerichteten Verbindungskanal 85 miteinander verbunden. Der nutartige Verbindungskanal 85 ist zur Dichtfläche 31 bzw. zum Abstreifer 26 hin offen, so daß vom Abstreifer 26 abgenommene Farbmengen in den Verbindungskanal 85 und von diesem in die Saugkanäle 83, 84 gelangen. Luft wird über einen quer zum Verbindungskanal 85 gerichteten und hier mittig an diesen anschließenden Luftkanal 86 zugeführt.In the exemplary embodiment according to FIGS. 9, 10 and 11 with a wide transmission area 27, two suction channels 83, 84 (FIG. 11) arranged at a transverse distance from one another are provided. These lead via separate suction lines or via a common suction line 77, 78 to the respective storage container 43, 44 which is under vacuum. The mouths of the suction channels 83, 84 below the scraper 26 are connected to one another by a transverse connecting channel 85. The groove-like connecting channel 85 is open to the sealing surface 31 or to the wiper 26, so that amounts of paint removed from the wiper 26 enter the connecting channel 85 and from there into the suction channels 83, 84. Air is supplied via an air duct 86 directed transversely to the connecting duct 85 and here centrally adjoining it.
Der blockartige Farbbehälter 30 ist mit einer ringsherum verlaufenden Farbrinne 87 versehen. Diese ist oben und dient zum Sammeln von etwa nicht erfaßten Farbmengen. Die Farbrinne 87 kann in geeigneter, nicht gezeigter Weise entleert werden. Bei dem Detail gemäß Fig. 4 und Fig. 9 ist erkennbar, daß die Führungsbolzen 39 oben in die hier mit größerer Breite ausgebildete Farbrinne 87 eintreten.The block-like paint container 30 is provided with a color groove 87 running all around. This is at the top and is used to collect quantities of paint that have not been recorded. The color groove 87 can be emptied in a suitable manner, not shown. In the detail according to FIG. 4 and FIG. 9 it can be seen that the guide bolts 39 enter the color groove 87 formed here with a larger width.
Die vorstehend beschriebenen Maßnahmen zur Beseitigung von notwendigerweise auftretenden Flüssigkeits- bzw. Farbmengen im Bereich der Dichtungsflächen 31, 32 bzw. des Abstreifers 26 können auch bei anderen Druck- bzw. Flüssigkeitssystemen mit notwendigen Abdichtungen eingesetzt werden.The measures described above for eliminating the quantities of liquid or paint that necessarily occur in the area of the sealing surfaces 31, 32 or the wiper 26 can also be used in other pressure or liquid systems with necessary seals.
Claims (18)
- Method for the coating of liquids, particularly of dyestuff, onto material webs or blanks, for example of colour markings (10) onto film webs (11), with a printing unit (16) which has a dye chamber (24) and a dye-transfer member, preferably a rotating dye roller (25), the dyestuff flowing through the dye chamber (24) constantly or intermittently, characterized in that the dyestuff is conveyed from one reservoir (43) through the dye chamber (24) into another reservoir (44) and back again.
- Method according to Claim 1, characterized in that alternatively one reservoir (43) or the other reservoir (44) is subjected to pressure and/or negative pressure.
- Method according to Claim 1 or 2, characterized in that sealing regions between the dye-coating member or the dye roller (25), on the one hand, and the dye chamber (24), on the other hand, are subjected to negative pressure, in such a way that any residues of the liquid or dyestuff are sucked off in the sealing region constantly or from time to time.
- Method according to Claim 3, characterized in that sucked-off residues of the liquid or dyestuff are introduced into the liquid circuit.
- Apparatus for the coating of liquids, particularly dyestuffs, onto material webs or blanks, with a printing unit (16) which has a dye chamber (24) and at least one movable print-coating member, such as a rotary-driven dye roller (25), the print-coating member or the dye roller (25) dipping with a part region into the dye chamber (24) and the dye chamber (24) being connected to at least one feed conduit (45) and to at least one discharge conduit (46), by means of which liquid can be fed to the dye chamber (24) and extracted from this constantly or discontinuously, characterized in that the dye chamber (24) is connected to at least two reservoirs (43, 44) via conduits - feed conduit (45), discharge conduit (46) -, the dyestuff in each case being conveyable from one reservoir (43, 44) via the conduits (45, 46) through the dye chamber (24) to the other particular reservoir (44, 43).
- Apparatus according to Claim 5, characterized in that the dyestuff can be guided through the dye chamber (24) under the influence of compressed air and/or negative pressure, preferably air conduits (47, 48) being connected to the reservoirs (43, 44) and alternatively one reservoir (43, 44) or the other being capable of being subjected to compressed air and/or air under negative pressure.
- Apparatus according to Claim 6, characterized in that at least one air conduit (47, 48) is connected in each case to the reservoirs (43, 44) and can be connected alternately to a compressed-air source or to a negative-pressure source, in such a way that the reservoir (43, 44) dispensing dyestuff is subjected to compressed air and the particular reservoir (44, 43) receiving dyestuff is subjected to negative pressure.
- Apparatus according to Claim 5 or one of the further claims, characterized in that the dye chamber (24) is part of an upwardly open dye container (30).
- Apparatus according to Claim 5 or one of the further claims, characterized in that the dye roller (25) is mounted above the dye chamber (24) and penetrates from above with a circumferential surface into the dye chamber (24) or into the supply of dyestuff.
- Apparatus according to Claim 9 or one of the further claims, characterized in that the dye container (30) has on both sides of the dye chamber (24) sealing surfaces (31, 32) which are matched to the shape and dimensions of the dye roller (25) and are designed in particular as cylindrical surfaces and which limit the dye chamber (24).
- Apparatus according to Claim 5 or one of the further claims, characterized in that, according to a strip-shaped or annular transfer region (27) defined on the circumference of the dye roller (25), the dye chamber (24) is designed as a radially directed bore approximately with a diameter corresponding to the width of the transfer region (27) or as an axis-parallel duct with a length corresponding approximately to the width of the dye-coating surface.
- Apparatus according to Claim 10 or one of the further claims, characterized in that suction ducts (74, 76; 83, 84) and/or a connecting duct (85) open out in the region of the sealing surfaces (31, 32) of the dye container (30), in order to suck off excess dye on the circumference of the dye roller (25) or on the sealing surfaces (31, 32), preferably on edge regions of the sealing surfaces (31, 32).
- Apparatus according to Claim 12, characterized in that the dye roller (25) is assigned a stripper (26), particularly in the region of the exit of the cylindrical surface of the dye roller (25) from the region of the sealing surfaces (31), and in that suction ducts (74) for sucking off excess dye directly precede the stripper (26) in the direction of rotation of the dye roller, in such a way that stripped-off dye passes into the suction ducts (74).
- Apparatus according to Claim 12 or one of the further claims, characterized in that the suction ducts (74, 76; 83, 84) and/or connecting duct (85) picking up liquid or dye residues are connected to the reservoirs (43, 44) via suction conduits (77, 78), the suction conduits (77, 78) being connectable in each case by means of slides (79, 80) to the reservoir (43, 44) receiving liquid or dye.
- Apparatus according to Claim 5 or one of the further claims, characterized in that the dye container (30) has an externally encircling, upwardly open dye trough (87) for receiving dye residues.
- Apparatus according to Claim 5 or one of the further claims, characterized in that the dye container (30) can be adjusted in terms of the relative position in relation to the dye roller (25), in particular by means of an adjustable support of the dye container (30) on a carrier, namely on a carrier plate (50).
- Apparatus according to Claim 5 or one of the further claims, characterized in that the dye chamber (24) is designed as a groove, depression or bore which is open to the dye roller (25) and which has adjoining it a circulation duct (68) consisting, in particular, of duct legs (69, 70) and a transverse duct (71).
- Apparatus according to Claim 5 or one of the further claims, characterized in that, in the case of a wide transfer region (27) of the dye roller (25), the dye chamber (24) is designed as an axis-parallel groove open to the dye roller (25) or as a duct, dye ducts (72, 73) adjoining the ends of the dye chamber (24).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE19513888A DE19513888A1 (en) | 1995-04-19 | 1995-04-19 | Method and device for applying markings, in particular color markings, to film webs |
DE19513888 | 1995-04-19 |
Publications (2)
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EP0738594A1 EP0738594A1 (en) | 1996-10-23 |
EP0738594B1 true EP0738594B1 (en) | 2000-04-05 |
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EP95120627A Expired - Lifetime EP0738594B1 (en) | 1995-04-19 | 1995-12-28 | Method and device for application of liquids on web sheet material, particularly of printing inks |
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US (1) | US5674571A (en) |
EP (1) | EP0738594B1 (en) |
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DE4138807C1 (en) * | 1991-11-26 | 1993-06-03 | Cornelis Wapenveld Nl Gorter | Colour chamber doctor - is for colour-transfer, screened circular cylindrical body such as screen roller or engraved cylinder |
DE4311834C2 (en) * | 1993-04-08 | 2001-02-01 | Roland Man Druckmasch | Device for coating substrates in printing machines |
DE4342303C2 (en) * | 1993-12-11 | 1995-12-14 | Isele Herbert | Stencil or screen printing system with frameless stencil or screen clamping system and closed doctor head |
US5372670A (en) * | 1994-02-02 | 1994-12-13 | International Business Machines Corporation | System for wet application of a dry film to a panel |
-
1995
- 1995-04-19 DE DE19513888A patent/DE19513888A1/en not_active Withdrawn
- 1995-12-28 EP EP95120627A patent/EP0738594B1/en not_active Expired - Lifetime
- 1995-12-28 DE DE59508135T patent/DE59508135D1/en not_active Expired - Fee Related
-
1996
- 1996-02-05 US US08/597,070 patent/US5674571A/en not_active Expired - Fee Related
- 1996-04-12 JP JP8091307A patent/JPH08318615A/en active Pending
- 1996-04-19 BR BR9601994A patent/BR9601994A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
BR9601994A (en) | 1998-10-06 |
JPH08318615A (en) | 1996-12-03 |
EP0738594A1 (en) | 1996-10-23 |
US5674571A (en) | 1997-10-07 |
DE19513888A1 (en) | 1996-10-24 |
DE59508135D1 (en) | 2000-05-11 |
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