SE535277C2

SE535277C2 - Cutting device for cutting, perforating and creasing a thin flexible material and method thereof

Info

Publication number: SE535277C2
Application number: SE1050793A
Authority: SE
Inventors: Peter Larsson; Tomas Larsson
Original assignee: Business Forms Equipment Ab
Priority date: 2010-07-14
Filing date: 2010-07-14
Publication date: 2012-06-12
Also published as: SE1050793A1; WO2012008899A1

Description

535 27? 2 båda klippen ändras. En nackdel med denna klippenhet är att avstånden mellan första och andra trummans klipp är begränsade till de olika utväxlingarna mellan de olika hopkopplade kugghjulen som är kopplade till de båda valsarna. Ytterligare en nackdel med klippenheten enligt US4009626 är att valsarna inte kan ställas in så att de rör sig med pappersbanans hastighet i klippögonblicket och under resten av varvet drivs fortare eller långsammare beroende på önskad längd på det klippta arket och på spillremsan. 535 27? 2 both clips change. A disadvantage of this cutting unit is that the distances between the cuts of the first and second drums are limited to the different gears between the different interconnected gears which are connected to the two rollers. Another disadvantage of the cutting unit according to US4009626 is that the rollers cannot be adjusted so that they move at the speed of the paper web at the moment of cutting and during the rest of the turn are driven faster or slower depending on the desired length of the cut sheet and the waste strip.

EP0035462 visar en klippenhet med två motgående valsar med en kniv på varje vals. Knivarna arbetar mot varandra som en sax. Valsarna drivs av en varvtalsreglerad elmotor så att de rör sig med pappersbanans hastigheti klippögonblicket men under resten av varvet drivs de fortare eller långsammare för att ge önskad längd på det klippta arket. Hastighetsanpassningen sker med hjälp av mikroprocessorer, hastighets- eller positionssensorer. Arklängden anges med ett tumhjul eller liknande, därefter beräknar mikroprocessorerna ett lämpligt hastighetsschema. En nackdel med klippenheten enligt EP0035462 är att endast ett klipp sker per varv, vilket innebär att mycket korta klippavstånd är svåra att åstadkomma och att nämnda klippenhet inte är avsedd att klippa av spillremsor mellan de olika arken. Denna klippenhet är dessutom dyr i och med att ett ﬂertal sensorer behövs för att hastighetsanpassa valsarna.EP0035462 discloses a cutting unit with two opposing rollers with a knife on each roller. The knives work against each other like scissors. The rollers are driven by a speed-controlled electric motor so that they move at the speed of the paper web at the moment of cutting, but during the rest of the turn they are driven faster or slower to give the desired length of the cut sheet. The speed adjustment is done with the help of microprocessors, speed or position sensors. The sheet length is indicated by a thumbwheel or similar, then the microprocessors calculate a suitable speed scheme. A disadvantage of the cutting unit according to EP0035462 is that only one cutting takes place per turn, which means that very short cutting distances are difficult to achieve and that said cutting unit is not intended to cut off waste strips between the different sheets. This cutting unit is also expensive as a number of sensors are needed to adjust the speed of the rollers.

Uppﬁnningens syfte Syftet med föreliggande uppﬁnning är sålunda att tillhandahålla en skäranordning och ett forfarande för avskärning, perforering eller bigning av en framåtlöpande bana av papper eller liknande tunt böjligt material, som kan ställas in så att längden av de uppskurna arken och längden av spillremsorna är oberoende av avstånden mellan knivarna utefter trummornas periferi, samtidigt som knivarnas hastighet motsvarar hastigheten hos arkbanans hastighet i skärögonblicket.The object of the invention is thus the object of the present invention is to provide a cutting device and a method for cutting, perforating or bending a forward web of paper or similar thin flexible material, which can be adjusted so that the length of the cut sheets and the length of the waste strips are independent. of the distances between the knives along the periphery of the drums, while the speed of the knives corresponds to the speed of the sheet web speed at the moment of cutting.

Sammanfattning av uppﬁnningen Ovanstående syfte och andra syften, vilka framgår av nedanstående beskrivning, uppnås genom föreliggande uppﬂnning såsom den deﬁnieras i de självständiga patentkraven 1 och 9. Lämpliga utföringsformer av uppﬁnningen anges i de underordnade patentkraven 2-8 och 9-19. Således definieras, enligt 15 20 25 30 535 277 3 föreliggande uppﬁnning, en skäranordning för upprepad skärning på tvären av en framlöpande materialbana innefattande en första roterande trumma innefattande åtminstone en kniv och en andra roterande trumma innefattande åtminstone en kniv, vilken åtminstone en kniv på nämnda första roterande trumma samverkar med åtminstone ett mothåll eller med åtminstone en motkniv anordnat/-d på nämnda andra roterande trumma på så sätt att nämnda åtminstone en kniv på nämnda första roterande trumma skär av materialbanan mot nämnda åtminstone ett mothåll eller åtminstone en motkniv hos nämnda andra roterande trumma och att nämnda åtminstone en kniv på nämnda andra roterande trumma samverkar med åtminstone ett mothåll eller med åtminstone en motkniv anordnat/-d på nämnda första roterande trumma på så sätt att nämnda åtminstone en kniv på nämnda andra roterande trumma skär av materialbanan mot nämnda åtminstone ett mothåll eller åtminstone en motkniv hos nämnda första roterande trumma, varvid nämnda framlöpande materialbana kan skäras av på åtminstone tvâ ställen per trummavarv, kännetecknad av att nämnda första trumma är anordnad att drivas av en första elektrisk servomotor och nämnda andra trumma är anordnad att drivas av en andra elektrisk servomotor, vilka första och andra elektriska servomotorer är anslutna till åtminstone ett programmerbart reglerdon som är anordnat att reglera åtminstone en av nämnda trummors periferihastighet, och att nämnda åtminstone ett reglerdon är anordnat att reglera periferihastigheten hos minst en av nämnda första och andra trumma så att periferihastighet hos trummanl-orna kan avvika från materialbanans hastighet vid tidpunkter då skärning ej sker.SUMMARY OF THE INVENTION The above object and other objects, which appear from the following description, are achieved by the present invention as defined in the independent claims 1 and 9. Suitable embodiments of the invention are set forth in the dependent claims 2-8 and 9-19. Thus, according to the present invention, there is defined a cutting device for repeatedly cutting transversely of a flowing web of material comprising a first rotating drum comprising at least one knife and a second rotating drum comprising at least one knife, which at least one knife on said first rotating drum cooperates with at least one abutment or with at least one counter-knife arranged / -d on said second rotating drum in such a way that said at least one knife on said first rotating drum cuts the web of material against said at least one abutment or at least one counter-knife of said second rotating drum and that at least one knife on said second rotating drum cooperates with at least one abutment or with at least one counter-knife arranged / -d on said first rotating drum in such a way that said at least one knife on said second rotating drum cuts the web of material towards said at least one counter or at least one counter knife of n said first rotating drum, wherein said advancing web of material can be cut off at at least two places per drum revolution, characterized in that said first drum is arranged to be driven by a first electric servomotor and said second drum is arranged to be driven by a second electric servomotor, which first and other electric servomotors are connected to at least one programmable control device arranged to control at least one of said peripheral speed of said drums, and said at least one control device is arranged to control the peripheral speed of at least one of said first and second drums so that peripheral speed of the drums may deviate from the speed of the web at times when cutting does not occur.

I enlighet med uppﬁnning erhålls fördelen att periferihastigheten hos en trumma överrensstämma med materialbanans hastighet i skärögonblicket och kan avvika därifrån under andra delar av varvet. På detta sätt erhålls en bra skärning utan dammbildning och avståndet mellan skärningarna kan dessutom regleras steglöst utan hänsyn till trummornas omkrets och avståndet mellan knivarna på en trumma.In accordance with the invention, the advantage is obtained that the peripheral speed of a drum corresponds to the speed of the web of material at the moment of cutting and can deviate therefrom during other parts of the revolution. In this way a good cut is obtained without dust formation and the distance between the cuts can also be adjusted steplessly without regard to the circumference of the drums and the distance between the knives on a drum.

Enligt en fördelaktig utföringsform kan periferihastigheten hos minst en av nämnda första och andra trumma vara reglerbar så att skärning sker på bestämda avstånd på materialbanan som kan ställas in genom programmering av nämnda åtminstone ett reglerdon. På detta sätt hanteras spillremsans längd i förhållande till arkets längd. 20 30 535 277 4 Enligt en fördelaktig utföringsform kan trummornas periferihastigheter vara reglerbar så att de har ett under varvet oförändrat inbördes vinkelläge som är inställbart genom programmering av nämnda åtminstone ett reglerdon. Härigenom bibehålls spillremsans längd medan arkets längd regleras i olika format.According to an advantageous embodiment, the peripheral speed of at least one of said first and second drums can be adjustable so that cutting takes place at certain distances on the web of material which can be set by programming said at least one control device. In this way, the length of the spill strip is handled in relation to the length of the sheet. According to an advantageous embodiment, the peripheral speeds of the drums can be adjustable so that they have a mutually unchanged angular position during the turn which is adjustable by programming the at least one control device. This maintains the length of the waste strip while the length of the sheet is regulated in different formats.

Enligt ytterligare en utföringsform är trummornas hastighetsschema automatiskt fastställbart av nämnda åtminstone ett reglerdon enligt förutbestämda regler efter det att en operatör har angett önskade avstånd mellan skärningama.According to a further embodiment, the speed diagram of the drums is automatically determinable by the at least one control device according to predetermined rules after an operator has specified the desired distances between the cuts.

Enligt ytterligare en utföringsform känner positionssensorer av läget hos materialbanan och via nämnda åtminstone ett reglerdon finjusteras trummornas hastigheter så att skärning sker på förutbestämda punkter pâ materialbanan oberoende av eventuella hastighetsvariationer på denna.According to a further embodiment, position sensors sense the position of the material web and via the at least one control device the speeds of the drums are fine-tuned so that cutting takes place at predetermined points on the material web independent of any speed variations thereon.

Enligt ytterligare en utföringsform innefattar skäranordningen ett vakuumaggregat och nämnda undre trumma är försedd med en kanal i vilken nämnda vakuumaggregat är anordnat att alstra ett undertryck för att mot den undre trummans periferiyta hålla fast sådana delar av den framlöpande materialbanan som nämnda åtminstone en kniv hos den övre trumman har skurit av från nämnda framlöpande materialbana. Härigenom skapas en kontrollerad hantering av spillremsan ner i efterföljande utsug.According to a further embodiment, the cutting device comprises a vacuum assembly and said lower drum is provided with a channel in which said vacuum assembly is arranged to generate a negative pressure for holding against the peripheral surface of the lower drum such parts of the leading material web as said at least one knife of the upper the drum has cut off from said emerging web of material. This creates a controlled handling of the waste strip down into the subsequent extraction.

Enligt ytterligare en utföringsform innefattar skäranordningen ett tryckaggregat som är anordnat att alstra en tryckstöt i nämnda kanal efter en förutbestämd tid efter vakuumalstringen.According to a further embodiment, the cutting device comprises a pressure assembly which is arranged to generate a pressure surge in said channel after a predetermined time after the vacuum generation.

Ur ytterligare en aspekt av uppfinningen deﬁnieras ett förfarande för upprepad avskäming av en framlöpande materialbana på tvären.From a further aspect of the invention, there is provided a method of repeatedly cutting a projecting web of material transversely.

Kortfattad beskrivning av ritningama Uppﬁnningen kommer nu att beskrivas närmare med hjälp av icke begränsande utföringsexempel och med hänvisning till de bifogade ritningama, där; Figur 1 visar en perspektivvy av en utföringsform av en skäranordning 1 enligt föreliggande uppfinning, där materialbanan skärs av både av kniven hos den övre trumman och av kniven hos den undre trumman, där kniven hos den undre trumman har skurit av materialbanan bildande ett ark visat till höger om skäranordningen och där kniven hos den övre trumman har skurit av 20 30 535 277 5 materialbanan bildande en spillremsa belägen mot den undre trummans periferi, och Figur 2 visar en schematisk vy av skäranordningen där var och en av de två cylindriska trummorna är kopplade till en elektrisk servomotor. De två elektriska servomotorerna som driver de två cylindriska trummorna är kopplade till var sitt reglerdon som styr nämnda trummor.Brief Description of the Drawings The invention will now be described in more detail by means of non-limiting exemplary embodiments and with reference to the accompanying drawings, in which; Figure 1 shows a perspective view of an embodiment of a cutting device 1 according to the present invention, where the web of material is cut off both by the knife of the upper drum and by the knife of the lower drum, where the knife of the lower drum has cut off the web of material forming a sheet shown to to the right of the cutting device and where the knife of the upper drum has cut off the web of material forming a waste strip located against the periphery of the lower drum, and Figure 2 shows a schematic view of the cutting device where each of the two cylindrical drums is connected to an electric servomotor. The two electric servomotors which drive the two cylindrical drums are each connected to a control device which controls said drums.

Detaljerad beskrivning av uppﬁnningen I ﬁgurerna 1 och 2 visas en utföringsform av föreliggande uppﬁnning, tillämpad på ett skäranordning avsett för att skära av, perforera eller biga en framlöpande bana av ett tunt böjligt material. Det skall dock direkt understrykas att uppﬁnningen inte på något sätt är begränsad till just denna typ av skäranordning, utan kan tillämpas på varjehanda skäranordning.Detailed Description of the Invention Figures 1 and 2 show an embodiment of the present invention, applied to a cutting device intended for cutting, perforating or bending a projecting web of a thin flexible material. However, it should be directly emphasized that the invention is in no way limited to this particular type of cutting device, but can be applied to any type of cutting device.

Figur 1 visar en perspektivvy av en skäranordning 1 enligt föreliggande uppﬁnning. I denna utföringsform innefattar skäranordningen 1 två trummor 2, 3 som är roterbart monterade i en ram 13 (ej hela visad). Vid drift matas en materialbana 10 av exempelvis papper in med en viss hastighet mellan dessa trummor 2, 3 och klipps eller skärs av med knivar 4, 5 anordnade på trummorna 2. 3. Var och en av de båda trummorna 2, 3 i tig. 1 innefattar en kniv 4, 5 och mothåll anordnat utmed periferin hos respektive trumma 2, 3, varvid kniven 4 på den första trumman 2 samverkar med mothållet på den andra trumman 3 på sådant sätt att kniven 4 skär av materialbanan 10 mot mothållet och kniven 5 på den andra trumman 3 samverkar med mothållet på den första trumman 2 på så sätt att kniven 5 skär av materialbanan 10 mot mothållet. Givetvis är det möjligt att använda motknivar istället för mothåll och givetvis kan varje trumma 2, 3 innefatta ﬂer än en kniv. Genom att trummorna 2, 3 är försedda med mothåll eller motknivar för samverkan med den motsatta trummans 3, 4 knivar 5 erhålls en kompakt skäranordning 1 med litet utrymmesbehov och låga tillverkningskostnader. l beskrivningen anges att materialet i materialbanan 10 är papper, men givetvis är andra tunna böjliga material möjliga, exempelvis plast, ﬁlt, metall eller en kombination av dessa. Med skärning avses inte bara fullständig genomskärning av materialbanan 10 som leder till avskiljning av ark 11 utan även styckevis genomskärning för att underlätta senare avrivning eller vikning, sk perforering, samt även delvis genomskärning i tjockleksriktningen som ger en försvagning i 15 20 25 30 535 277 6 materialet för att underlätta senare vikning, sk bigning. De båda trummorna 2, 3 är inte begränsade till att ha samma omkrets, utan kan givetvis ha olika omkrets.Figure 1 shows a perspective view of a cutting device 1 according to the present invention. In this embodiment, the cutting device 1 comprises two drums 2, 3 which are rotatably mounted in a frame 13 (not shown in full). In operation, a web of material 10 of, for example, paper is fed in at a certain speed between these drums 2, 3 and is cut or cut off with knives 4, 5 arranged on the drums 2. 3. Each of the two drums 2, 3 in fig. 1 comprises a knife 4, 5 and abutment arranged along the periphery of the respective drum 2, 3, the knife 4 on the first drum 2 cooperating with the abutment on the second drum 3 in such a way that the knife 4 cuts off the web of material 10 against the abutment and the knife 5 on the second drum 3 cooperates with the abutment of the first drum 2 in such a way that the knife 5 cuts off the web of material 10 against the abutment. Of course it is possible to use counter knives instead of abutments and of course each drum 2, 3 can include ﬂ er than one knife. Because the drums 2, 3 are provided with abutments or counter-knives for cooperation with the knives 5 of the opposite drum 3, 4, a compact cutting device 1 is obtained with a small space requirement and low manufacturing costs. In the description it is stated that the material in the material web 10 is paper, but of course other thin flexible materials are possible, for example plastic, ,lt, metal or a combination of these. By cutting is meant not only complete cutting of the web of material 10 which leads to separation of sheets 11 but also piecemeal cutting to facilitate later tearing or folding, so-called perforation, as well as partial cutting in the thickness direction which gives a weakening in 15 20 25 30 535 277 6 the material to facilitate later folding, so-called bending. The two drums 2, 3 are not limited to having the same circumference, but can of course have different circumferences.

De två knivarna 4, 5 hos trummorna 2, 3 skär av den framlöpande materiaibanan 10 i ark 11 och i spilldelar 12. Kniven 5 hos den andra, undre, trumman 3 skär av materiaibanan 10 i ark 11 och kniven 4 hos den andra, övre, trumman 2 skär av materiaibanan 10 i spilldelar 12, där periferihastigheten hos de två trummorna 2,3 i förhållande till materialbanans 10 hastighet avgör arklängden respektive längden på spillremsan12 .The two knives 4, 5 of the drums 2, 3 cut off the advancing material web 10 into sheets 11 and into waste parts 12. The knife 5 of the second, lower, drum 3 cuts of the material web 10 into sheets 11 and the knife 4 of the second, upper , the drum 2 cuts the material web 10 into waste parts 12, where the peripheral speed of the two drums 2,3 in relation to the speed of the material web 10 determines the sheet length and the length of the waste strip 12, respectively.

I ﬁg. 2 visas en schematisk vy av skäranordningen 1 enligt föreliggande uppﬁnning. l ﬁg. 2 är de två trummorna 2, 3 kopplade till var sin elektrisk servomotor 6, 7, vilka i sin tur är kopplade till och styrs av var sitt elektriskt reglerdon 8, 9. På detta sätt kan periferihastigheten hos de två trummorna 2, 3 varieras noggrant även inom ett varv, vilket möjliggör att periferihastighet hos en trumma 2, 3 kan styras så att den överresstämmer med materialbanans 10 hastighet i skärögonblicket men att den kan awika därifrån under andra delar av trummans 2, 3 rotationsvarv. Fördelen med detta är att avståndet mellan skärningarna inte är beroende av avståndet mellan knivarna längs trummornas 2, 3 periferi och att arken 10 får ett högkvalitativt snitt.I ﬁ g. 2 shows a schematic view of the cutting device 1 according to the present invention. l ﬁ g. 2, the two drums 2, 3 are each connected to an electric servomotor 6, 7, which in turn are connected to and controlled by their respective electrical regulators 8, 9. In this way the peripheral speed of the two drums 2, 3 can be varied accurately. also within one revolution, which enables the peripheral speed of a drum 2, 3 to be controlled so that it corresponds to the speed of the web of material 10 at the moment of cutting but that it can deviate therefrom during other parts of the rotational revolution of the drum 2, 3. The advantage of this is that the distance between the cuts is not dependent on the distance between the knives along the periphery of the drums 2, 3 and that the sheets 10 have a high quality cut.

Periferihastigheten hos en trumma 2, 3 beror på vilken längd på arket 11 respektive spillremsan 12 som önskas. Om arkets 11 längd skall vara lika med omkretsen på nämnda trummor 2, 3 kan hastighet hos kniven 5 hos den andra trumman 3 vara konstant så att dess periferihastighet är lika med materialbanans 10 hastighet. Om arkets 11 längd däremot skall vara längre än periferin hos trummorna 2, 3 skall hastigheten hos kniven 5 hos den andra trumman 3 vara lika med materialbanans 10 hastighet i ögonblicket för skärningen, men vara lägre än materialbanans 10 hastighet mellan skärningarna till dess rätt längd på arket 11 har passerat den andra trumman 3 och därefter måste hastigheten på kniven 5 accelereras upp till materialbanans 10 hastighet vid ögonblicket för skärningen.The peripheral speed of a drum 2, 3 depends on the length of the sheet 11 and the waste strip 12, respectively, which is desired. If the length of the sheet 11 is to be equal to the circumference of said drums 2, 3, the speed of the knife 5 of the second drum 3 can be constant so that its peripheral speed is equal to the speed of the web of material 10. If, on the other hand, the length of the sheet 11 is to be longer than the periphery of the drums 2, 3, the speed of the knife 5 of the second drum 3 must be equal to the speed of the material web 10 at the moment of cutting, but be lower than the speed of the material web 10 between the cuts the sheet 11 has passed the second drum 3 and then the speed of the knife 5 must be accelerated up to the speed of the web of material 10 at the moment of cutting.

Om arkets 11 längd skall vara kortare än omkretsen på den andra trumman 3 kommer knivens 5 hastighet att vara densamma som materialbanans 10 hastighet i ögonblicket för skärningen, men därefter måste kniven 5 accelereras till en högre hastighet mellan avskärningsintervallerna så att en kortare del av materiaibanan 10 kommer att passera den andra trumman 3 mellan avskärningsintervallerna. 15 20 535 277 7 Det exakta hastighetsschemat för trummorna 2, 3 behöver inte ställas in av en operatör, det fastställs automatiskt av nämnda elektriska reglerdon 8, 9 enligt förutbestämda parametrar som styrs av ett inmatat avstånd på arken 11 av operatören. Därmed erfordras inget byte av varken trummor 2, 3 eller knivar 4, 5 när avståndet mellan skärningarna skall ändras, det styrs istället av operatören.If the length of the sheet 11 is to be shorter than the circumference of the second drum 3, the speed of the knife 5 will be the same as the speed of the web of material 10 at the moment of cutting, but then the knife 5 must be accelerated to a higher speed between cut-off intervals. will pass the second drum 3 between the cut-off intervals. The exact speed scheme of the drums 2, 3 does not need to be set by an operator, it is determined automatically by said electrical regulator 8, 9 according to predetermined parameters controlled by an entered distance on the sheets 11 by the operator. Thus, no replacement of either drums 2, 3 or knives 4, 5 is required when the distance between the cuts is to be changed, it is instead controlled by the operator.

På detta sätt sparas komponentkostnader och ställtid.In this way, component costs and set-up time are saved.

Nämnda andra trumma 3 innefattar en kanal (ej visad i ﬁgurerna) som mynnar uti en öppning vid kniven 5 hos nämnda andra trumma 3. I kanalen alstras ett undertryck för att hålla fast en remsformig del 12 som skurits loss från den framåtlöpande pappersbanan 10. Undertrycketi nämnda kanal kan hålla fast nämnda remsformiga del, spillremsan, 12 tills den roterande kniven 5 roterat ungefär ett halvt varv, varefter de remsformiga delarna 12 kan stötas bort med en momentan tryckstöt i kanalen så att de remsformiga delarna sugs ut och bort från skäranordningen via exempelvis en sug (ej visad iﬁgurerna). De remsformiga delarna leds bort från skäranordningen och samlas lämpligtvis upp i någon form av uppsamlingsbehållare (ej visad i ﬁgurerna). Kanalen är lämpligtvis ansluten till ett vakuum-/tryckluftsaggregat (ej visade i ﬁgurerna) för alstring av nämnda vakuum och nämnda tryckstöt i kanalen.Said second drum 3 comprises a channel (not shown in the ur gures) which opens into an opening at the knife 5 of said second drum 3. A negative pressure is generated in the channel to hold a strip-shaped part 12 which is cut loose from the advancing paper web 10. The negative pressure in said channel can hold said strip-shaped part, the waste strip, 12 until the rotating knife 5 has rotated about half a turn, after which the strip-shaped parts 12 can be pushed away with an instantaneous pressure shock in the channel so that the strip-shaped parts are sucked out and away from the cutting device a suction (not shown in the ur gures). The strip-shaped parts are led away from the cutting device and are suitably collected in some form of collecting container (not shown in the ﬁ gures). The duct is suitably connected to a vacuum / compressed air unit (not shown in the ur gures) for generating said vacuum and said pressure surge in the duct.

Claims

5 10 15 20 25 30 535 277 PATENT REQUIREMENTS.

A cutting device (1) for repeatedly cutting transversely of a leading web of material (10) comprising a first rotating drum (2) comprising at least a first knife (4) and a second rotating drum (3) comprising at least a second knife (5) , which at least first knife (4) on said first rotating drum (4) cooperates with at least one counter-hollow or with at least one counter-knife arranged / -d on said second rotating drum (3) in such a way that said at least first knife (4) on said first rotating drum (2) cuts the web of material (10) against said at least one anvil or at least one counter knife of said second rotating drum (3) and that said at least second knife (5) on said second rotating drum (3) cooperates with at least a counter hollow or having at least one counter knife arranged on said first rotating drum (2) in such a way that said at least second knife (5) on said second rotating drum (3) cuts off the web of material (10) against said at least one opposite hollow or at least one counter-knife of said first rotating drum (2), wherein said leading material web (10) can be cut off at at least two places per drum revolution, characterized in that said first drum (2) is arranged to be driven by a first electric servomotor (6). ) and said second drum (3) is arranged to be driven by a second electric servomotor (7), which first and second electric servomotors (6, 7) are connected to at least one programmable control device (8, 9) which is arranged to control at least one of said peripheral speed (2, 3) of said drum, that said at least one control device (8, 9) is arranged to control the peripheral speed of at least one of said first and second drum (2, 3) so that peripheral speed of the drum (s) (2 , 3) may deviate from the speed of the web (10) at times when cutting does not take place, and the speed diagram of the drums (2, 3) is automatically determined by the at least one control device (8, 9) according to predetermined rules after the operator has specified the desired distances between the cuts. 20 25 30 535 277

Cutting device according to claim 1, characterized in that the peripheral speed of at least one of said first and second drums (2, 3) is adjustable so that cutting takes place at certain distances on the material web (10), said peripheral speed being arranged to be set by programming of said at least one control device (8, 9).

Cutting device according to one of the preceding claims, characterized in that the peripheral speed of the drums (2, 3) is adjustable so that they have an unchanged mutual angular position during the revolution, said peripheral speed being adjustable by programming the servomotors' control means (8, 9).

Cutting device according to one of the preceding claims, characterized in that position sensors are arranged to sense the position of the web of material (10) and, via the at least one control device (8, 9), adjust the speeds of the drums (2, 3) so that cutting can take place at predetermined points on the material web (10) regardless of any speed variations on it.

Cutting device according to any one of the preceding claims, characterized in that said first electric servomotor (6) is connected to a first control device (8) and said second electric servomotor (7) is connected to a second control device (9).

Cutting device according to any one of the preceding claims, characterized in that it comprises a vacuum assembly and that said second drum (3) is provided with a channel in which said vacuum assembly is arranged to generate a negative pressure to hold such parts against the peripheral surface of the lower drum. of the leading material web (10) which said at least first knife (4) of the first drum (2) has cut off from said leading material web (10). 15 20 25 30 535 277 10

Cutting device according to claim 6, characterized in that it comprises a pressure assembly which is arranged to generate a pressure surge in said channel after a predetermined time after the vacuum generation.

A method of repeatedly cutting a projecting web of material (10) transversely, the web of material (10) being fed through a first rotating drum (2) and a second rotating drum (3), said first rotating drum (2) comprising at least one first knife (4) and said second rotating drum (3) comprising at least one second knife (5), which at least first knife (4) on said first rotating drum (2) cooperates with at least one abutment or with at least one counter-knife arranged / - d on said second rotating drum (3) in such a way that the web of material (10) is cut off with said at least first knife (4) on said first rotating drum (2) against said at least one abutment or at least one counter-knife of said second rotating drum ( 3) and that said at least second knife (5) on said second rotating drum (3) cooperates with at least one abutment or with at least one counter-knife arranged / -d on said first rotating drum (2) in such a way that the web of material (10) is cut of me d said at least second knife (5) on said second rotating drum (3) against said at least one abutment or at least one counter-knife of said first rotating drum (2), said advancing web of material (10) being cut off at at least two places per drum revolution, characterized in that it comprises the steps of: - driving said first and second drums (2, 3) with a first and a second electric servomotor (6, 7); - connecting said first and second electric servomotors (6, 7) to at least one programmable control device (8, 9) for controlling the peripheral speed of at least one of said drums (2, 3); - controlling the peripheral speed of at least one of said first and second drums (2, 3) with said at least one regulator (8, 9) so that the peripheral speed of the drum (s) (2, 3) can deviate from the speed of the material web (10) at times when cutting does not take place; and - determining the speed diagram of the drums (2, 3) automatically of the at least one control device (8, 9) according to predetermined rules after the operator has specified the desired distance between the cuts.

Method according to claim 8, characterized in that the peripheral speed of at least one of said first and second drums (2, 3) is controlled so that cutting takes place at certain distances on the web of material (10), said peripheral speed being set by programming said at least one regulators (8, 9).

Method according to claim 8 or 9, characterized in that the peripheral speed of the drums (2, 3) is controlled so that they have an unchanged angular position during the revolution, said peripheral speed being set by programming the regulators (8, 9) of the servomotors (6, 7). ).

Method according to one of Claims 8 to 10, characterized in that position sensors sense the position of the web of material (10) and, via said at least one control device (8, 9), adjust the speeds of the drums (2, 3) so that cutting can take place at predetermined points. on the web of material (10) independent of any velocity variations thereon.

Method according to any one of claims 8-11, characterized in that said first electric servomotor (6) is connected to a first control device (8) and said second electric servomotor (7) is connected to a second control device (9).

Method according to one of Claims 8 to 12, characterized in that a negative pressure is generated in a channel in the second drum (3) by a vacuum assembly, which negative pressure holds such parts of the emerging web of material (10) as the first knife (4). ) of the first drum (2) has cut off from 15 535 27? 12 said opening material web (10) against the peripheral surface of the second drum (3).

A method according to claim 13, characterized in that a pressure surge is generated in said channel by a pressure assembly after a predetermined time after the vacuum generation.

Method according to one of Claims 8 to 14, characterized in that the cut penetrates the web of material (10) completely over its entire width (sheet).

Method according to one of Claims 8 to 14, characterized in that the cut penetrates only the web of material (10) on parts of its width (perforation).

Method according to one of Claims 8 to 14, characterized in that the cut penetrates only the web of material (10) to a part of its thickness (bending).