SE202340C1

SE202340C1 -

Info

Publication number: SE202340C1
Authority: SE
Publication date: 1965-01-01

Description

Uppfinnare: K Chybinski Prioritet begard Iran den 15 maj 1957 (Storbritannien) Foreliggande uppfinning avser roterande tryckpressar och speciellt en press for tryckning av flerfargsbilder pa for tryckfarg mottagligt material vid framstallning av t. ex. sedlar, frimarken och andra vardehandlingar. Inventor: K Chybinski Priority requested Iran 15 May 1957 (Great Britain) The present invention relates to rotary printing presses and in particular to a press for printing multicolor images on ink-receptive material in the manufacture of e.g. banknotes, stamps and other deeds.

Sedlar tillverkas ofta med en bakgrund som är tryckt med olika tryekfarger medelst ett hiigtrycks- eller offset-tryckforfarande. Det är kant, att det är svart att genom fotografering skilja de element, vilka i flera farger bilda en sadan bakgrund och darigenom astadkommes ett skydd mot forfalskningar. Dessutom är det mycket svart for en fOrfalskare att astadkomma efterapningar ddr de olika fargade bakgrundselementen befinna sig i riktig Overensstammelse med varandra. Banknotes are often made with a background printed with different printing inks by means of a high-pressure or offset printing process. It is an edge that it is black to distinguish by photography the elements which in several colors form such a background and thereby provide protection against counterfeiting. In addition, it is very black for a counterfeiter to create imitations where the different colored background elements are in true agreement with each other.

Vid det Unda forfarandet vid framstallfling av sedlar med s. k. flerfargad skyddsbakgrund erhalles bakgrunden medelst ett hogtrycksforfarande eller ett offset-tryckf8rfarande och huvudbilden astadkommes pa papperet vid en sekundar separat arbetsoperation i antingen samma eller en sekundar maskin medelst en djuptrycksplat, som framstallts fran original som gra-verats av konstnarer for att astadkomma ett effektivt sakert igenkanningstecken. In the process of producing banknotes with a so-called multicolored protective background, the background is obtained by means of a high-pressure process or an offset printing process and the main image is obtained on paper in a second separate working operation in either the same or a secondary machine by a gravure plate. performed by artists to achieve an effective secure recognition mark.

For att erhalla en sedel som är annu svarare att forfalska Or det viktigt att bakgrunden och djuptrycken befinna sig i perfekt Overensstammelse. Emellertid ãr det mycket svart att erhalla en perfekt overensstammelse nar de bada tryckftirfarandena anvandas vid separata arbetsoperationer som namnts ovan. In order to obtain a banknote that is even more likely to counterfeit, it is important that the background and gravure prints are in perfect agreement. However, it is very difficult to obtain a perfect match when the two printing procedures are used in separate work operations mentioned above.

Ett andamal med uppfinningen är att astadkomma en anordning medelst vilken sedlar kunna tryckas bade med en medelst hogtrycksforfarande framstalld bakgrund i farg Dupl. kl. 15 k: 2/01; 15 k: 9/ och en djuptryckt huvudbild i en enda arbetsoperation, varvid extra onskvarda sakra igenkanningstecken astadkommas. An object of the invention is to provide a device by means of which banknotes can be printed both with a background in color Dupl produced by means of a high-pressure process. at 15 k: 2/01; 15 k: 9 / and a deep-printed main image in a single work operation, whereby extra unwanted sacred recognition characters are achieved.

Nedan kommer beteckningen sedlar att for enkelhets skull aven innefatta andra fargtryckta blad sasom frimarken och andra vardehandlingar. Below, the term banknotes will, for the sake of simplicity, also include other color-printed leaves such as the stamp and other valuable documents.

Enligt uppfinningen innefattar en roterande tryckpress en platcylinder, som uppbar en djuptrycksplat, en tryckcylinder, som Or anordnad att samverka med platcylindern, ett fargverk f8r anbringning av en enda farg pa platen, en avtorkningsanordning for borttagning av farg frail djuptrycksplatens plana yta och vidare ett fargverk far anbringning av en annan tryckfarg eller tryckfarger i ett pa for-hand bestamt monster pi den avtorkade ytan hos djuptrycksplaten, sa att monstret befinner sig i Onskad overensstammelse med de djuptryckta delarna hos platen, varvid pap-per, som matas mellan de hada cylindrarna kan tryckas samtidigt med bade en hogtryckt bid och en djuptryckt bild. According to the invention, a rotary printing press comprises a plate cylinder carrying a gravure printing plate, a printing cylinder arranged to cooperate with the plate cylinder, a dye for applying a single dye to the plate, a wiping device for removing ink from the gravure surface of a gravure printing plate and further may apply another ink or inks to a predetermined sample on the wiped surface of the gravure plate, so that the sample is in desired shape with the gravure portions of the plate, whereby paper fed between the hot cylinders may is printed at the same time as both a high-pressure bid and a deep-printed image.

Lampligen innefattar fargverket f8r djuptrycksplaten en djuptrycksinfargningsvals i presskontakt med platen vilken vals erhaller tryckfarg fran en faigbehallare eller annan matningskalla. - Fargverket for infargning av djuptrycks- platen med hogtrycksbilden innefattar lampligen liven en hogtrycksfarg Overforande vals tryckkontakt med platen och en eller flera hjalpvalsar, som Oro sa installda, att de farga overforingsvalsen med ett pa forhand bestamt monster i en eller flera farger. Lampligen Oro tva eller flera hjalpvalsar anordnade och en hogtrycksplat, som representerar en del av den onskade bilden, Or lampligen anordnad 2202 3 pa var och en av hj5.1pvalsama for att sa farga overforingsvalsen, att, nar fargen av overforingsvalsen har overfOrts till djuptrycksplaten, denna kommer att fargas med monstret i riktig overensstammelse med de djuptryckta delarna hos djuptrycksplaten. Lamply, the ink unit for the gravure printing plate comprises a gravure dyeing roller in press contact with the plate, which roller receives printing ink from a fig container or other feed source. The inking unit for dyeing the gravure plate with the high-pressure image probably includes a high-pressure ink. The transfer roller pressure contact with the plate and one or more auxiliary rollers, as Oro said installed, color the transfer roller with a predetermined sample in one or more colors. Suitably arrange two or more auxiliary rollers and a high pressure plate, which represents a part of the desired image. this will be stained with the sample in proper accordance with the gravure printed portions of the gravure plate.

Enligt ett alternativt utforingsexempel hr en huvudplat, som uppbares av en hjalpvals och hr utformad med den fullstandiga bakgrundsbilden, i tryckkontakt med bade Overforingsvalsen och med en fargsamlingsvals. Denna erhaller lampligen farg frail en eller flera fargplatar vilka uppbaras pa valsar och sta i forbindelse med fargtillforselanordningar. Varje fargplat är utbildad med formen hos bakgrundsbildens area som erfordras i vilken som heist farg, och om mer an en fargplat Kr anordnad, sit komma de fargtryck som Overforas till fargsamlingsvalsen att ligga 1 riktig overensstammelse med varandra. According to an alternative embodiment, a main plate, which is supported by an auxiliary roller and formed with the complete background image, is in pressure contact with both the transfer roller and with a color collection roller. This suitably receives color from one or more color plates which are supported on rollers and stand in connection with color supply devices. Each color plate is formed with the shape of the background image area required in whichever color, and if more than one color plate is arranged, the color prints transferred to the color collection roller will be in proper agreement with each other.

Det forutsattes nedan nar en cylinder eller vals beskrives vara i kontakt med en annan, att omkretsen hos den can valsen eller cylindem är en jamn multipel av omkretsen hos den andra, och att tangentialhastigheten vid vilken som heist punkt ph omkretsen hos den ena är lika med tangentialhastigheten vid omkretsen hos den andra. It was assumed below when one cylinder or roller is described to be in contact with another, that the circumference of the can roller or cylinder is an even multiple of the circumference of the other, and that the tangential velocity at which point the pH of the circumference of one is equal to the tangential velocity at the circumference of the other.

Ett utforingsexempel pa uppfinningen skall nedan narmare beskrivas med hanvisning till bifogade ritningar. Fig. 1 visar en schematisk vy av en utforingsform av en tryckpress och fig. 2 en schematisk vy av en modifikation av utforingsformen enligt fig. 1. An embodiment of the invention will be described in more detail below with reference to the accompanying drawings. Fig. 1 shows a schematic view of an embodiment of a printing press and Fig. 2 a schematic view of a modification of the embodiment according to Fig. 1.

Den roterande tryckpressen enligt fig. 1 innefattar en. platcylinder 1 som hr i presskontakt med och har samma diameter som en tryckcylinder 2, varvid cylindrarna rotera med samma hastighet och i olika riktning som visas av pilarna a och b. En djuptrycksplat uppbares av pla'tcylindem 1 och är graverad med huvuddelen av den bild som skall tryckas pa en. sedel. Vala eller torra pappersblad matas fran en stapel 3 av icke visade organ till greppet mellan platcylindem 1 och tryckcylindem 2 ddr de skola tryckas av djuptrycksplaten. The rotary printing press according to Fig. 1 comprises a. plate cylinder 1 which is in press contact with and has the same diameter as a printing cylinder 2, the cylinders rotating at the same speed and in different directions as shown by the arrows a and b. to be printed on one. banknote. Selected or dry sheets of paper are fed from a stack 3 of means (not shown) to the grip between the plate cylinder 1 and the printing cylinder 2 when they are to be printed by the gravure plate.

Farg tillfores djuptrycksplaten frail en fargbehallare 4 medelst en stalcylinder 5, en transportvals 6 och en djuptrycksinfargningsvals 7 som befinner sig i presskontakt med ytan hos djuptryeksplaten som uppbares av platcylindern 1. Omkretsen hos platcylindern 1 ar en jamn multipel av tryckvalsens 7 omkrets. Ink is supplied to the gravure plate from a ink container 4 by means of a steel cylinder 5, a transport roller 6 and a gravure ink roller 7 which is in press contact with the surface of the gravure plate supported by the plate cylinder 1. The circumference of the plate cylinder 1 is an even multiple of the printing roller 7.

En. fargekonomiseringsanordning, som hr belagen vid platcylinderns 1 omkrets efter infargningsvalsen 7 i cylinderns 1 rotationsriktning, innefattar ett andlost band 8, t. ex. av gummibelagd flit, som matas runt tvb. val sar 9, varvid bandet drives av den ena av de hada valsarna och spannes av en spannvals 10. Bandet 8 Ur sit anordnat, att det anligger mot djuptrycksplaten och darvid avlagsnar 8verskott av farg frau dennas yta, varvid fargen skrapas fran bandet medelst en. skrapa 11, varifran den aterfores till fargbehallaren 4 for fornyad anvandning. One. color economizing device, which is coated at the circumference of the plate cylinder 1 after the dyeing roller 7 in the direction of rotation of the cylinder 1, comprises a breathless belt 8, e.g. of rubber-coated flit, which is fed around the tvb. roller sar 9, the belt being driven by one of the hot rollers and tensioned by a clamping roller 10. The belt 8 is arranged so that it abuts the gravure printing plate and thereby removes excess color from its surface, the paint being scraped from the belt by means of one. scraper 11, from which it is returned to the paint container 4 for reuse.

Tre avtorkningsanordningar av kand typ aro belagna kring omkretsen hos platcylindern 1 efter fargekonomiseringsanordningen. Varje avtorkningsanordning innefattar ett band 12 av absorberande material, t. ex. kattun, papper eller dylikt vilket drages fran en matningsvals 13 till en annan vals 14 fOrbi brytvalsar 15 och mellan ett oscillerande tryckorgan 16 och ytan hos djuptrycksplaten. Apparaterna aro sit anordnade, att all farg torkas av djuptrycksplatens yta men lamnas kvar i dess djuptryckta delar. Three wipers of the candle type are coated around the circumference of the plate cylinder 1 after the color saving device. Each wiper device comprises a band 12 of absorbent material, e.g. cotton, paper or the like which is pulled from one feed roller 13 to another roller 14 past break rollers 15 and between an oscillating pressure member 16 and the surface of the gravure plate. The apparatus is arranged so that all color is dried by the surface of the gravure plate but is left in its gravure parts.

Ett antal hogtrycksplatcylindrar 17 for astadkommande av en flerfargad bakgrund aro anordnade, varvid antalet motsvarar det antal farger som man Onskar trycka pit papperet och hos anordningen i fig. 1 visas tva cylindrar. Var och en av de hada cylindrarna 17 aro forsedda med en hogtrycksplat som är fast pa omkretsen, varvid varje plat svarar mot en. del av det bakgrundsm8nster som skall tryckas i varje farg. Varje cylinder 17 befinner sig vid rotation i presskontakt med en overforingsvals 18 for hogtrycksfarg, vilken vals är belagd med ett fjadrande material. Fargoverforingsvalsen 18 hr aven i presskontakt med ytan hos den av platcylindern 1 uppburna djuptrycksplaten nar denna befMner sig i ett lage intill valsen. Olika farger overforas till tryckplatarna pit varje cylinder 17 av fargverk vilka vart och ett innefatta en behallare 20 for tryckfarg, en stalcylinder 21, som overfor farg till en hoppvals 22, som oscillerar i en riktning vinkelratt mot sin axel mellan cylindem 21 och en stalcylinder 23. Denna oscillerar jamnt pa sin axel och transporterar farg till en. overforingsvals 24. Fargen upptages sedan frau valsen 24 av en annan stalcylinder 25 som oscillerar pa sin axel, och far sedan via en vals 26 passera till en annan oscillerande stalcylinder 27, varifran den matas till tva formvalsar 19, vilka arc i kontakt med ytorna hos cylindrarna 17 och tillforsakra en god fargoverforing. A number of high-pressure plate cylinders 17 for creating a multicolored background are provided, the number corresponding to the number of colors which it is desired to print the pit paper, and in the device in Fig. 1 two cylinders are shown. Each of the had cylinders 17 is provided with a high pressure plate which is fixed on the circumference, each plate corresponding to one. part of the background pattern to be printed in each color. Each cylinder 17 is in rotation in press contact with a high pressure ink transfer roller 18, which roller is coated with a resilient material. The ink transfer roller 18 is also in press contact with the surface of the gravure plate 1 supported by the plate cylinder 1 when it is in a layer adjacent to the roller. Different colors are transferred to the printing plates pit each cylinder 17 by inks each comprising a printing container 20, a steel cylinder 21, which opposite color to a jump roller 22, which oscillates in a direction perpendicular to its axis between the cylinder 21 and a steel cylinder 23. This oscillates evenly on its axis and transports color to one. transfer roller 24. The paint is then taken from the roller 24 by another steel cylinder 25 which oscillates on its axis, and then passes via a roller 26 to another oscillating steel cylinder 27, from where it is fed to two forming rollers 19, which are in contact with the surfaces of cylinders 17 and ensure a good color transfer.

Fargoverforingsvalsen 18 erhaller ett tryck I riktig overensstammelse med monstren vart och ett i olika fitrg, frail hogtrycksplatarna som uppbaras av cylindrarna 17 och 5verfOra detta tryck till djuptrycksplatens avtorkade yta. Trycket som bildas i djuptryckspatens avtorkade yta hr anordnat att vara i riktig overensstammelse med de djuptryckta delar- 20233 na av platen och darfor bor omkretsen utgora en Allan multipel av omkretsen hos platcylindem hos hogtrycksinfargningsvalsen 18. The ink transfer roller 18 obtains a pressure in proper agreement with the samples each in different shapes, frail the high pressure plates supported by the cylinders 17 and 5Transfer this pressure to the wiped surface of the gravure plate. The pressure formed in the wiped surface of the gravure spatula is arranged to be in proper conformity with the gravure portions of the plate and therefore the circumference should be an Allan multiple of the circumference of the plate cylinder of the high pressure ink roller 18.

Efter det att djuptrycksplaten, som uppbares pa platcylindern 1, har passerat det lage i vilket den befinner sig i presskontakt med tryckcylindern 2 i vilket lage ett pappersblad tryckes, torkas den farg som efter tryckningen finns kvar pa platens yta av denna me-deist ytterligare en avtorkningsanordning av det slag som tidigare beskrivits och som innefattar ett band 28 av papper, kattun eller liknande, vilket band passerar fran en matningsvals 29 mellan ett oscillerande pressorgan 30 och omkretsen hos en annan vals 31. After the gravure plate, which is supported on the plate cylinder 1, has passed the layer in which it is in press contact with the printing cylinder 2 in which layer a sheet of paper is printed, the ink which remains after printing on the plate is dried by this medium for a further wiping device of the type previously described and comprising a belt 28 of paper, cotton or the like, which belt passes from a feed roller 29 between an oscillating press member 30 and the circumference of another roller 31.

Nar platcylindern roterar medurs sasom visas i fig. 1 och de andra cylindrama och valsama rotera synkront med denna, belagges djuptrycksplaten med farg av djuptrycksinfargningsvalsen 7, varvid overskottsfarg avlagsnas medelst bandet 8 hos fargekonomiseringsanordningen. Ytan hos platen är di fullstandigt avtorkad av banden 12 hos de tre avtorkningsanordningama vilka aro sá anordnade, att farg kvarlamnas i de graverade delarna hos djuptrycksplaten, vilka delar trycka huvuddelen av sedelmonstret. When the plate cylinder rotates clockwise as shown in Fig. 1 and the other cylinders and rollers rotate synchronously therewith, the gravure plate is coated with ink by the gravure ink roller 7, the excess ink being deposited by the belt 8 of the ink economizer. The surface of the plate is completely wiped by the strips 12 of the three wiping devices which are arranged so that color is left in the engraved parts of the gravure plate, which parts print the main part of the banknote sample.

Den avtorkade ytan hos platen fargas sedan med bakgrundsmonstret i tvâ farger i Overensstammelse med det graverade monstret medelst overfOringsvalsen 18 for hogtrycksfarg. HOgtrycksfargerna kunna icke Ora kontakt med fargerna i de graverade delarna hos djuptrycksplalama eftersom konkava fargmenisker uppsta i de etsade partierna, nar platen torkas ay. Detta resulterar i att det fargade bakgrundsmOnstret O. Over-'ores till ytan hos djuptrycksplaten att inget mellanrum eller overlappning uppstar mellan linjerna hos bakgrundsbilden och bilden pa den djuptryckta delen av platen. The wiped surface of the plate is then stained with the background sample in two colors in accordance with the engraved sample by means of the high pressure ink transfer roller 18. The high-pressure inks cannot contact the colors in the engraved parts of the gravure plates because concave color menisci arise in the etched portions when the plate is dried. As a result, the colored background pattern O. Over-'ores to the surface of the gravure plate that no gap or overlap occurs between the lines of the background image and the image of the gravure portion of the plate.

Ett torrt eller vatt pappersblad 3 som har matats fram av (icke visade) organ till greppet mellan platcylindern 1 och tryckcylindern 2, passerar daremellan och tryckes i ett tryckningsmoment av djuptrycksplaten i tre farger, namligen en enda farg for huvuddjuptrycksmonstret och tva farger for den hogtryckta bakgrunden. Bladet 3 transporteras sedan fran tryckcylindern till en stapel 33 medelst ett transportband av kand typ som visas schematiskt vid 32. A dry or wet sheet of paper 3 which has been fed by means (not shown) to the grip between the plate cylinder 1 and the printing cylinder 2, passes between them and is printed in one printing moment by the gravure printing plate in three colors, namely one color for the main gravure sample and two colors for the high pressure the background. The blade 3 is then transported from the printing cylinder to a stack 33 by means of a conveyor belt of the type known schematically at 32.

Det fjadrande material som tacker djuptrycksinfargningsvalsen 7 kan skaras bort vid en punkt i overensstammelse med en del av det djuptryckta mOnstret sá att ett sigillmarke eller liknande bildas som man Onskar reproducera pa sedeln sasom ett prageltryck. Den del av djuptrycksplaten som innefattar sigillmarket infargas alltsa icke av infarg ningsvalsen 7 och trycket erhalles med en bakgrund av en av de hada hogtrycksfargerna. The resilient material which thanks to the gravure dyeing roller 7 can be cut away at a point in accordance with a part of the gravure pattern so that a seal mark or the like is formed which it is desired to reproduce on the banknote as a pragmatic print. The part of the gravure plate which comprises the sealing ground is thus not dyed by the dyeing roller 7 and the print is obtained with a background of one of the high pressure inks.

Anordningen som visas i fig. 2 är en alternativ konstruktion for anbringande av hogtrycksbakgrunden pa ytan hos djuptrycksplaten som visas vid 34 och är fast vid omkretsen hos platcylindern 1. TO fargverk A, B, vilka aro liknande de som tidigare beskrivits, aro anordnade att var och en med one farger infarga fargareoma hos fargplatar 35, 36, vilka aro fasta pa omkretsarna hos cylindrar 17, resp. 17'. Platarna 35, 36 aro sit for-made att de svara mot areorna hos sedelmonstrets bakgrund vilka ytor erfordras i vardera fargen. The device shown in Fig. 2 is an alternative construction for applying the high pressure background to the surface of the gravure plate shown at 34 and is fixed to the circumference of the plate cylinder 1. TWO inks A, B, which are similar to those previously described, are arranged to be and one-color inking the color areas of color plates 35, 36, which are fixed to the perimeters of cylinders 17, respectively. 17 '. The plates 35, 36 are shaped to correspond to the areas of the background of the banknote sample which surfaces are required in each color.

Cylindrarna 17, 17' aro var och en i tryckkontakt med en fargsamlingsvals 37, vilken har en diameter lika med cylindrarna 17, 17' och till vilken farg fran fargplatarna 35, 36 over fares med Onskad overenssta.mmelse. Fargsamlingsvalsen 37 ar ocksh i presskontakt med huvudplatarna 38, vilka uppbaras pa en huvudplatcylinder 39. Varje huvudplat 38 är utbildad med det fullstandiga erforderliga bakgrundsmonstret och infargas med tva farger av samlingsvalsen 37 i overensstammelse med den anordning av farg, som Overfores Iran fargplatama 35, 36. Huvudplatama aro i presskontakt med fargoverforingsvalsen 18 som i sin tur ar anordnad att infarga den avtorkade ytan hos djuptrycksplaten 34 med det erforderliga bakgrundsmonstret i tva farger och i Overensstammelse med de graverade delarna hos denna plat. The cylinders 17, 17 'are each in pressure contact with a color collecting roller 37, which has a diameter equal to the cylinders 17, 17' and to which color from the color plates 35, 36 is transferred with the desired conformity. The ink collecting roller 37 is also in press contact with the main plates 38, which are supported on a main plate cylinder 39. Each main plate 38 is formed with the complete required background pattern and dyed with two colors by the collecting roller 37 in accordance with the color arrangement transferred to the color plates. The main plates are in press contact with the ink transfer roller 18 which in turn is arranged to color the wiped surface of the gravure plate 34 with the required background pattern in two colors and in accordance with the engraved parts of this plate.

Far att forhindra nedflackning av hogtrycksfargerna genom kontakt mellan fargplatarna 35, 36 med farg pa farguppsamlingsvalsen 37 Iran fargverken A resp. B, aro torkverken C och D anordnade for fargplatama 35 resp. 36. Torkverken C och D avtorka fargplatarna efter det att de ha overfOrt farg frail valsama 19 till samlingsvalsen 37 och innan de Ater infargas. To prevent flattening of the high-pressure inks by contact between the color plates 35, 36 with paint on the paint collection roller 37 Iran dyes A resp. B, the dryers C and D are arranged for the color plates 35 and 35, respectively. 36. The wipers C and D wipe the color plates after they have transferred the paint from the rollers 19 to the collecting roller 37 and before they are re-dyed.

Varje torkverk C och D innefattar ett band 40 av absorberande material sasom papper, kattun eller dylikt, som matas runt omkring och mellan valsar 41 frhn en huvudvals 42. Denna speciella anordning utgOr medlet for erhallande av en bakgrund i vilken varje linje hos den fargade bilden kan tryckas i en annan farg utan avbrott och utan overlappning av fargerna. Each dryer C and D comprises a strip 40 of absorbent material such as paper, cotton or the like, which is fed around and between rollers 41 from a main roller 42. This special device constitutes the means for obtaining a background in which each line of the colored image can be printed in another color without interruption and without overlapping the colors.

Det framgar att uppfinningen i allmanhet erbjuder fordelen att linjerna hos monstren hos den fargade bakgrunden icke endast aro i full averensstammelse med djuptrycket utan att aven linjerna i den fargade bakgrunden och linjerna i det monster som astadkommes av djuptrycket, aro tryckta sida vid sida utan nagot mellanrum mellan sig och utan over- 42023 lappning, vilket ger upphov till en fargeffekt, sou) icke kan erhallas nar djuptryck utfores ovanpa en tidigare utford hogtryckt bakgrund. It can be seen that the invention generally offers the advantage that the lines of the samples of the colored background are not only in full agreement with the gravure but also the lines of the colored background and the lines of the sample produced by the gravure are printed side by side without any space between them and without overlap, which gives rise to a color effect, sou) can not be obtained when gravure printing is performed on top of a previously challenged high-printed background.

Dessutom beror icke den genomgaende likformigheten hos bakgrundsfargerna vid tryckning av sedlarna i nagon namnvard grad pa pappersytans slathet. Hogtrycksfargen ligger i ett tunt lager pa djuptrycksplatens yta och den ansenliga presskraften som anvants vid tryckningen for att framstalla djuptrycket astadkommer en god kontakt mellan papperet och hogtrycksfargen. In addition, the overall uniformity of the background colors when printing the banknotes to any nominal degree does not depend on the smoothness of the paper surface. The high-pressure ink lies in a thin layer on the surface of the gravure plate and the considerable compressive force used in the printing to produce the gravure printing provides a good contact between the paper and the high-pressure ink.

Claims

Patent claim:

Gravure printing machine with a plate cylinder, on the circumference of which a gravure plate is fixed, a printing cylinder arranged to cooperate with the plate cylinder, a dyeing device for dyeing the gravure plate in a single color and with wiping means, characterized by further dyeing together with printing plates. (18) are arranged for transfer of the ink in a sample designated to the wiped surface of the gravure plate, so that the ink sample is in desired conformity with the etched parts of the gravure plate, whereby the paper is printed simultaneously with a gravure generated sample and a gravure print.

Gravure printing machine according to claim 1, characterized in that the device for dyeing the smooth surface of the gravure plate has a letterpress ink transfer roller (18), which is printed against the gravure plate and dyed from a device (20-27, 17, 19) in a pre-made certain pattern and in one or more colors.

Gravure printing machine according to claim 2, characterized in that the device for dyeing the letterpress ink transfer roller contains one or more letterpress plates.

Gravure printing machine according to claim 3, characterized in that each cylinder (17) provided with letterpress plates is pressed against a different part of the circumference of the letterpress ink transfer roller and the dyeing device or a dye plant (20-27, 19).

Gravure printing machine according to claim 4, characterized in that one or more autotype plates (35, 36) and a letterpress printing plate (38) are provided, the autotypical plates being arranged to be in communication with the inking unit as the screen printing plate and the screen printing plate are pressed against letterpress printing ink transfer.

Gravure printing machine according to claim 5, characterized in that a color collecting cylinder (37) is arranged for transferring printing ink from the autotype plates (35, 36) to the screen printing plate (38).

Gravure printing machine according to claim 5, characterized in that a wiping device flap (41, 42) is arranged to wipe the part of the surface of the usual autotype plate (35, 36) which just relaxes its contact with the cooperating cylinder.

Gravure printing machine according to any one of the preceding patent claims, characterized in that a color economizing device (8, 9, 10, 11) known per se is provided, which affects the surface of the gravure printing plate.

Gravure printing machine according to claims 2-8, characterized in that a part of the gravure dyeing roller (7) is cut away, which part corresponds to it. part of the gravure print sample to be reproduced on a print sheet such as a paragliding print.

Gravure printing machine according to one of the preceding patent claims, characterized in that a wiping device (28, 29, 30, 31) is arranged in front of the gravure dyeing roller (7). Cited publications: Patents from Sweden 163,554; France 1,095,176; Switzerland 141 342.