DK165737B - PROCEDURE FOR CUTTING OFF WIDTHS FROM A WIDE COAT, AND APPARATUS FOR EXERCISING THE PROCEDURE - Google Patents

PROCEDURE FOR CUTTING OFF WIDTHS FROM A WIDE COAT, AND APPARATUS FOR EXERCISING THE PROCEDURE Download PDF

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Publication number
DK165737B
DK165737B DK157590A DK157590A DK165737B DK 165737 B DK165737 B DK 165737B DK 157590 A DK157590 A DK 157590A DK 157590 A DK157590 A DK 157590A DK 165737 B DK165737 B DK 165737B
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Denmark
Prior art keywords
cutting
cylinder
knife
web
cut
Prior art date
Application number
DK157590A
Other languages
Danish (da)
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DK165737C (en
DK157590A (en
DK157590D0 (en
Inventor
Mogens Drost Larsen
Original Assignee
Drost Larsen Aps
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Priority to DK157590A priority Critical patent/DK165737C/en
Publication of DK157590D0 publication Critical patent/DK157590D0/en
Priority to PCT/DK1991/000178 priority patent/WO1992000169A1/en
Publication of DK157590A publication Critical patent/DK157590A/en
Publication of DK165737B publication Critical patent/DK165737B/en
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Publication of DK165737C publication Critical patent/DK165737C/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23DPLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D15/00Shearing machines or shearing devices cutting by blades which move parallel to themselves
    • B23D15/06Sheet shears
    • B23D15/08Sheet shears with a blade moved in one plane, e.g. perpendicular to the surface of the sheet
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26DCUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/04Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
    • B26D1/06Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
    • B26D1/065Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates for thin material, e.g. for sheets, strips or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26DCUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/26Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut
    • B26D1/30Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut with limited pivotal movement to effect cut
    • B26D1/305Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut with limited pivotal movement to effect cut for thin material, e.g. for sheets, strips or the like

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Making Paper Articles (AREA)
  • Treatment Of Fiber Materials (AREA)

Description

iin

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Opfindelsen angår en fremgangsmåde til afskæring af smalle strimler på tværs af en bred forrådsbane, samt et apparat til afskæring af smalle strimler fra en bred bane og omfattende en vinkelsektionsopdelt cylinder, og et 5 skæreorgan, eksempelvis en skærekniv, der har en skæreæg i cylinderens længderetning, og som er indrettet til at afskære en strimmel af den brede bane ved indtrængning mellem cylinderens sektioner.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a method for cutting narrow strips across a wide stock web, and to a narrow strip cutting apparatus from a wide web comprising an angular section divided cylinder, and a cutting means, for example a cutting knife having a cutting edge in the longitudinal direction of the cylinder. , and which is adapted to cut a strip of the wide web by penetrating between the sections of the cylinder.

10 Apparater, der ifølge kendt teknik er indrettet til at afskære smalle strimler fra brede forrådsbaner finder anvendelse inden for mange industrielle områder. F.eks. ved påsætning af hanke på bøtter og andre former for emballage, hvor der her f.eks. eksisterer et behov for at afskæ-15 re smalle foliestrimler fra en bred foliebane af et blødt materiale, hvor banen af hensyn til senere pålimning af de færdige hanke er gjort delvist selvklæbende.10 Prior art apparatus designed to cut narrow strips from wide storage webs is applicable in many industrial fields. Eg. by attaching handles to buckets and other types of packaging, where here e.g. there exists a need to cut narrow foil strips from a wide foil web of a soft material, the web being partially self-adhesive for later gluing of the finished handles.

Til overskæring af materiale fra en forrådsbane foretræk-20 kes sædvanligvis en teknik, der omfatter en cylinder, da såvel banen som den netop afskårne strimmel med enkle midler kan fastholdes, f.eks. ved hjælp af vacuum, så banen under skæreprocessen strammes ud, og så strimlen kan fastholdes efter afskæringen.For cutting material from a stock web, a technique comprising a cylinder is usually preferred since both the web and the just cut strip can be retained by simple means, e.g. by means of vacuum so that the web during the cutting process is tightened and so that the strip can be retained after the cutting.

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Med anvendelse af en sådan cylinder ved afskæring af strimler, vil den enkleste teknik bestå i, at en knivæg presses imod cylinderen, hvorved en skærelinie på tværs af banen afskærer en strimmel. Selv om der er tale om et 30 princip, hvor kniv og cylinder kan konstrueres på enkel vis, stiller ønsket om stor banebredde store krav til konstruktionens stivhed og nøjagtighed, især ved tynde og seje banematerialer. Kanten på den afskårne strimmel vil til mange formål være af en utilfredsstillende kvalitet, 35 idet den ofte ikke vil være udgjort af et rent snit og derved kan være flosset.Using such a cylinder when cutting strips, the simplest technique will consist of pressing a knife edge against the cylinder, thereby cutting a strip across the web. Although there is a principle in which knives and cylinders can be constructed in a simple way, the desire for wide web width places great demands on the rigidity and accuracy of the construction, especially with thin and tough web materials. For many purposes, the edge of the cut strip will be of unsatisfactory quality, as it will often not consist of a clean cut and thereby may be frayed.

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22

Til afskæring af strimler fra foliebaner foretrækkes sædvanligvis et skæresystem, der fungerer efter saksprincippet, hvor cylinderen er opdelt i langsgående sektioner, der hver har en skærende kant, der sammen med et knivblad 5 danner en saks. Hver sektion omfatter en række sugehuller til fastholdelse af banen og forbundet med en kanal i cy-lindersektionerne og derfra med et vacuumsystem gennem styrede ventiler.For cutting strips from foil webs, a cutting system is generally preferred which operates according to the scissor principle, the cylinder being divided into longitudinal sections, each having a cutting edge, which together with a knife blade 5 forms a scissors. Each section comprises a series of suction holes for holding the web and connected to a channel in the cylinder sections and thence with a vacuum system through controlled valves.

10 Knivens æg kan være retliniet. For at opnå en korrekt afskæring af strimlen, må det sikres, at foliebanen ikke udsættes for påvirkninger, der kan medføre en forskydning af folien langs valsen. Vinklen mellem knivæggen og valsen må derfor holdes inden for ganske nære tolerancer, 15 hvor 36-5° typisk vil kunne accepteres.10 The knife's eggs may be straight. In order to obtain a proper cut of the strip, it must be ensured that the foil web is not subjected to stresses which may cause a displacement of the foil along the roll. The angle between the knife wall and the roller must therefore be kept within very close tolerances, where 36-5 ° will typically be acceptable.

En foliebredde på 500 mm, vil selv ved en skærevinkel på 3e medføre en stor knivvandring. Under valsedrejningen kræves der typisk en frigang på 5 mm, og for at sikre 20 korrekt afskæring kræves der en indtrængningsdybde på min. 3 mm, hvilket giver en knivvandring på 34 mm. For hvert klip skal kniven føres 34 mm frem, og derefter 34 mm tilbage, hvilket for høje·produktionshastigheder giver ganske store knivhastigheder, samt betydelige accelera-25 tioner.A film width of 500 mm, even at a cutting angle of 3e, will lead to a large knife walk. During the roll rotation, a clearance of 5 mm is typically required and to ensure 20 proper cutting, a penetration depth of min. 3 mm, which gives a knife walk of 34 mm. For each clip, the knife must be moved 34 mm, and then 34 mm back, which produces too high knife speeds and high acceleration speeds.

Et andet velkendt system til afskæring af foliestrimler er skiveknivsystemet, hvor en cirkulær kniv sammen med en valse danner saksen. Hvis de normalt anvendte skiveknive 30 med diametre på ca. 100 mm eller mindre skal føres ind i knivvalsen, udføres et snit på 500 mm og føres ud ad knivvalsen igen på f. eks. 0,2 sek., vil det kræve meget store accelerationer og hastigheder.Another well-known system for cutting foil strips is the disc knife system, where a circular knife together with a roller forms the scissors. If the normally used disc knives 30 with diameters of approx. 100 mm or less must be inserted into the knife roller, a cut of 500 mm is carried out and again out of the knife roller for example 0.2 seconds, it will require very large accelerations and speeds.

35 Opfindelsen har til formål at angive en fremgangsmåde til afskæring af strimler fra en bred bane, hvortil der anvendes en kniv, der under afskæringen af strimler danner 3The invention has for its object to provide a method for cutting strips from a wide web, to which a knife is used which during the cutting of strips 3

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en i hovedsagen konstant vinkel med den brede bane, og hvormed knivvandringerne og knivens acceleration reduceres væsentligt i forhold til den kendte teknik.a generally constant angle with the wide web, and by which the knife walks and knife acceleration are substantially reduced in relation to the prior art.

5 Dette formål opnås som angivet i krav 1, hvor knivens æg er udformet, så det sikres, at tilbageføringen af kniven kan begynde inden afskæringen er afsluttet, og at afskæringen stadig sker ved en acceptabel vinkel, selv om knivens ene ende føres tilbage. Herved sikres det, at kniven 10 ved afskæringens afslutning ikke er længere inde i cylinderen, end den krævede indstikdybde, f.eks. 3 mm, hvilket giver en tilbageføring, der er væsentlig mindre end ved den kendte teknik, hvorved der ikke er behov for de store accelerationer og hastigheder, der tidligere var nødven-15 dige ved tilbageføring af kniven, og som belastede værktøjet i uhensigtsmæssig grad.This object is achieved as claimed in claim 1, wherein the knife's eggs are designed so that the return of the knife can begin before the cutting is completed and that the cutting still occurs at an acceptable angle, even if one end of the knife is returned. This ensures that the knife 10, at the end of the cut, is no longer inside the cylinder than the required insertion depth, e.g. 3 mm, which gives a return which is substantially smaller than in the prior art, whereby the large accelerations and speeds previously required in the return of the knife are not required which adversely affected the tool.

Opfindelsen angår desuden et apparat af den i indledningen nævnte art med midler til bevægelse af skæreorganet 20 som en kniv, så at en strimmel afskæres ved, at en første ende af skæreorganet føres mod cylinderen, så skæreæggen danner et skærepunkt, som under afskæringen bevæges på tværs af banen, med en i hovedsagen konstant vinkel mellem skæreknivens æg og skærecylinderens længdeakse, og at 25 midlerne til bevægelse af skærekniven er indrettet til at føre den første ende af skærekniven tilbage inden afskæringens afslutning. Cylinderen vil dreje under skæreproceduren med en konstant rotationshastighed. Skærekniven vil under afskæringen følge cylinderens drejebevægelse 30 omkring dennes rotationsakse. Når skærekniven er bragt ud af cylinderen, vil den ved en hurtig modsatrettet bevægelse føres modsat cylinderens bevægelse og bringes til at starte afskæringen af den næste strimmel. Denne rotation af cylinderen og den tilhørende drejebevægelse af 35 skærekniven kendes fra kendt teknik og vil ikke blive beskrevet yderligere, da den ikke er væsentlig for forståelsen af opfindelsen. Skærekniven vil således bringes 4The invention further relates to an apparatus of the kind mentioned in the preamble with means for moving the cutting means 20 as a knife, such that a strip is cut by a first end of the cutting means being guided towards the cylinder, so that the cutting edge forms a cutting point which is moved during cutting on across the web, at a substantially constant angle between the cutting knife's egg and the longitudinal axis of the cutting cylinder, and the means for moving the cutting knife are arranged to return the first end of the cutting knife before the end of the cutting. The cylinder will rotate during the cutting procedure at a constant rotational speed. During the cutting, the cutting knife will follow the rotation of the cylinder 30 about its axis of rotation. When the cutting knife is brought out of the cylinder, it will be guided by a rapid opposite movement opposite the movement of the cylinder and caused to start the cutting of the next strip. This rotation of the cylinder and the associated pivoting motion of the cutting knife is known from the prior art and will not be described further as it is not essential to the understanding of the invention. The cutting knife will thus be brought 4

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til at udføre en vuggende bevægelse, så de dele af kniven, der har bidraget til skæreprocessen allerede inden afskæringens afslutning, bringes tilbage i en position uden for cylinderens kontur.to perform a rocking motion so that the parts of the knife that contributed to the cutting process even before the end of the cut are returned to a position outside the contour of the cylinder.

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Som angivet i krav 3, kan den sekt ionsopdel te cylinder med fordel omfatte et antal i længderetningen tilvirkede skærende æg, der så samvirker med kniven under skæreprocessen. Krav 4 angiver hvorledes skæreorganet kan bevæges 10 ved hjælp af vinkelforskudte krumtappe, der som det angives i krav 5 kan forbindes til respektive befæstigelses-punktet i skæreorganets ender gennem stempelstænger. Det ene af disse befæstigelsespunkter kan som angivet i krav 6 være et omdrejningspunkt, mens det andet kan være en 15 lineær føring i skæreorganets længderetning. Krav 7-10 angiver hvorledes den sektionsopdelte cylinder kan omfatte midler til fastholdelse af såvel banen som de afskårne strimler, og at disse midler kan udføres af sugehuller der gennem et ventilsystem er forbundet til en ekstern 20 vacuumpumpe. Sugehullernes effekt kan forøges væsentligt ved at én del af cylinderens overflade i forbindelse med sugehullerne forsynes med ruheder, der f.eks. kan fremkomme ved sandblæsning af en del af de enkelte cylinder-sektioners overflade. Banen kan således ikke lukke luft-25 tæt op imod den sandblæste overflade, der derved blive aktivt sugende, men samtidig fortsat understøtter banen, så den ikke krøller.As set forth in claim 3, the sectional dividing cylinder may advantageously comprise a number of longitudinally cut cutting eggs which then cooperate with the knife during the cutting process. Claim 4 indicates how the cutting means can be moved 10 by means of angularly displaced cranks which, as stated in claim 5, can be connected to the respective fastening point at the ends of the cutting means through piston rods. One of these attachment points may be a pivot point as claimed in claim 6, while the other may be a linear guide in the longitudinal direction of the cutting member. Claims 7-10 specify how the sectioned cylinder may comprise means for retaining both the web and the cut strips, and that these means can be effected by suction holes connected through an valve system to an external vacuum pump. The effect of the suction holes can be substantially increased by providing one part of the surface of the cylinder in connection with the suction holes with roughness which e.g. may occur by sandblasting a portion of the surface of the individual cylinder sections. Thus, the web cannot close air 25 close to the sandblasted surface, thereby actively sucking, but at the same time still supporting the web so that it does not curl.

Opfindelsen skal i det efterfølgende forklares i forbin-30 delse med foretrukne udførelseseksempler og under henvisning til tegningen, hvor: fig. 1 i perspektiv viser en kendt vinkelsektionsopdelt cylinder; 35 fig. 2 skematisk viser den i fig. 1 viste cylinder i forbindelse med en kendt lineær kniv; f 5The invention will be explained in the following with reference to preferred embodiments and with reference to the drawing, in which: FIG. 1 is a perspective view of a known angular section divided cylinder; FIG. 2 diagrammatically illustrates that of FIG. 1 in connection with a known linear knife; f 5

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fig. 3 viser skematisk hvilke parametre, der lægges til grund for beregning af knivæggens krumning; fig. 4 viser i perspektiv en foretrukken udførelsesform 5 for et apparatur ifølge opfindelsen til afskæring af strimler; fig. 5a og b viser bevægelsen af den i fig. 4 viste kniv? og 10 fig. 6 i perspektiv viser et udsnit af den på fig. 4 viste cylinder.FIG. 3 schematically shows which parameters are used to calculate the curvature of the knife wall; FIG. 4 shows in perspective a preferred embodiment 5 of a strip cutting apparatus according to the invention; FIG. 5a and b show the movement of the device shown in FIG. 4 knife shown? and FIG. 6 is a perspective view of a section of FIG. 4.

På fig. 1 ses en i og for sig kendt sektionsopdelt cylin-15 der 10 til anvendelse ved afskæring af strimler fra en foliebane, der fremføres ved høj hastighed. Cylinderen 10 er delt op i et antal sektioner 11, der på den imod foliebanen vendende flade er forsynet med et antal sugehuller 12, som via indre kanaler 13 i cylinderen er forbun-20 det til et eksternt, ikke vist ventilstyret vacuumsystem, så at sugehullerne 12 i en sektion 11 kan bringes til at suge, og derved fastholde foliebanen under afklipning, mens en kniv føres ind i de mellem sektionerne dannede spalter.In FIG. 1, a sectional dividing cylinder 10 known per se is shown for use in cutting strips from a high-speed foil web. The cylinder 10 is divided into a number of sections 11 which are provided on the surface facing the film web with a number of suction holes 12 which are connected via internal channels 13 in the cylinder to an external, not shown valve controlled vacuum system, so that the suction holes 12 in a section 11 can be sucked, thereby retaining the film web during cutting while a knife is inserted into the slots formed between the sections.

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Fig. 2 illustrerer den kendte tekniks mangler og viser cylinderen 10, hvis centerlinie er markeret med en stiplet linie. En kniv 22 med en lineær æg 23 bringes til at udføre en translatorisk bevægelse af f.eks. to hydrauli-30 ske cylindre, der gennem to aksler 21 bibringer kniven 22 en frem- og tilbagegående bevægelse, som styres med to føringer 20. Cylinderen 10 kan enten fremføre banen kontinuerligt, så apparatet desuden omfatter midler til at føre skæremekanismen i en bevægelse, så knivbladet følger 35 knivcylinderen under afskæringen og føres til en ny position, når afskæringen afsluttes, eller fremføre banen i spring, så cylinderen 10 står stille under selve skære- 6FIG. 2 illustrates the deficiencies of the prior art and shows the cylinder 10, whose center line is marked by a dotted line. A knife 22 with a linear egg 23 is caused to perform a translational movement of e.g. two hydraulic cylinders which, through two shafts 21, impart a reciprocating motion to the knife 22, which is controlled by two guides 20. The cylinder 10 can either advance the web continuously, so that the apparatus further comprises means for guiding the cutting mechanism in a movement, so the knife blade follows the knife cylinder during the cutting and is moved to a new position when the cutting is completed, or advances the web in leaps so that the cylinder 10 is stationary under the cutting itself 6

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proceduren. Når kniven 22 og cylinderen 10 bevæges i forhold til hinanden, kræves der en frigang f, der typisk vil være i størrelsesordenen 5 mm. Med en vinkel på 3° mellem knivæggen 23 og cylinderen 10 og ved en skærelæng-5 de på 500 mm, vil den ene side af knivæggen være 26 mm tættere på cylinderen end den anden, hvilket er vist med h på figuren. For at sikre korrekt afskæring kræves der en minimum indstikning i af knivæggen 22, hvor i typisk er i størrelsesordenen 3 mm. Knivvandringen v vil her væ-10 re summen af disse tre parametre og svare til afstanden mellem knivens to yderstillinger, og vil i dette eksempel være v = 34 mm.procedure. When the knife 22 and cylinder 10 are moved relative to each other, a clearance f is required, which will typically be in the order of 5 mm. With an angle of 3 ° between the knife wall 23 and the cylinder 10 and at a cutting length of 500 mm, one side of the knife wall will be 26 mm closer to the cylinder than the other, as shown by h in the figure. To ensure proper cutting, a minimum insertion is required in the knife wall 22, which is typically in the order of 3 mm. The knife walk v will here be the sum of these three parameters and correspond to the distance between the two outer positions of the knife, and in this example will be v = 34 mm.

Fig. 4 viser et apparat ifølge opfindelsen til afskæring 15 af smalle strimler fra en bred bane 50, hvor strimlerne i dette eksempel skal anvendes til påsætning af hanke på bøtter, hvorfor banen 50 er vist som en transparent foliebane med påført klæbemiddel, hvor klæbeeffekten ved selve håndgrebet er neutraliseret ved at samkøre en pa-20 pirbane 51 i midten af den selvklæbende foliebane.FIG. 4 shows an apparatus according to the invention for cutting 15 strips from a wide web 50, where the strips in this example are to be used for attaching gloves to buckets, the web 50 is shown as a transparent foil web with applied adhesive, the adhesive effect of the handle itself is neutralized by interconnecting a pa-20 pier web 51 in the center of the self-adhesive foil web.

En kniv 40 med en æg 49 bringes til at afskære en strimmel fra foliebanen 50, ved at kniven 40 føres ind mellem cylinderens sektioner, der med fordel ligeledes kan være 25 tilvirket med en skæreæg, der sammen med knivæggen 49 fungerer som en saks. Kniven 40 bevæges af en aksel 41 med to krumtappe 43, der indbyrdes er vinkelforskudte med en vinkel w. Krumtappene 43 er hver gennem en plej Istang 44 forbundet til drej eled 45 med et krydshoved, der over-30 fører krumtappens roterende bevægelse til en lineær bevægelse af stempelstænger 42. Stempelstængernes lineære frem- og tilbageføring sikres af føringer 46, men kan også opnås ved at erstatte drejeleddet 45 med et krydshoved, der føres i styreplaner, hvorved den roterende bevæ-35 gelse overføres til lineær bevægelse af stempelstangen 42.A knife 40 with an egg 49 is made to cut a strip from the foil web 50 by inserting the knife 40 between the sections of the cylinder, which may also advantageously be made with a cutting egg which, together with the knife wall 49, acts as a scissors. The knife 40 is moved by a shaft 41 with two crankshaft 43, which are angularly displaced at an angle w. The crankshaft 43 is each connected through a plunger rod 44 to pivot joint 45 with a crosshead which transmits the rotary movement of the crank to a linear movement of piston rods 42. The linear return and return of the piston rods is ensured by guides 46, but can also be obtained by replacing the pivot joint 45 with a crosshead guided in guide planes, thereby transferring the rotary motion to linear movement of the piston rod 42.

77

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Kniven 40 er i den ene side drejeligt forbundet til en omdrejningstap 48 på den ene stempelstang. Kniven 40 har i den anden side en lineær føring eller en udsparing til optagelse af en omdrejningstap 47 på den anden stempel-5 stang. Hermed vil kniven 40 kunne følge de to stempelstænger 42's lineære frem- og tilbageføring. Ved at udforme kniven 40's æg 49 på passende vis vil man kunne opnå, at afskæringen af banen 50 starter ved, at kniven 40's højre side føres frem til dannelse af et skærepunkt, 10 der bevæges på tværs af banen 50 og afsluttes i kniven 40's venstre side, hvor kniven 40's højre side på dette tidspunkt allerede er ført ud af indgreb med cylinderen.The knife 40 on one side is pivotally connected to a pivot 48 on one piston rod. The knife 40, on the other hand, has a linear guide or recess for receiving a pivot pin 47 on the second piston-5 rod. This will allow the knife 40 to follow the linear reciprocation of the two piston rods 42. By appropriately shaping the knife 49 of the knife 40, it will be possible for the cutting of the web 50 to begin by advancing the right side of the knife 40 to form a cutting point 10 which moves across the web 50 and terminates in the left of the knife 40 a side where the right side of the knife 40 at this point has already been disengaged from the cylinder.

Det vil kunne forstås, at andre mekanismer end en fælles 15 krumtapaksel vil kunne udføre denne translatoriske bevægelse af kniven, men med dette princip vil det være muligt at udforme en simpel og driftssikker konstruktion. Bevægelsen vil alternativt kunne ske ved anvendelse af to hydrauliske cylindre, der på passende vis bringes til at 20 bevæge knivens ender.It will be appreciated that mechanisms other than a common crankshaft will be able to perform this translational movement of the knife, but with this principle it will be possible to design a simple and reliable construction. Alternatively, the movement may be effected using two hydraulic cylinders which are suitably caused to move the ends of the knife.

I lighed med den kendte teknik vil cylinderen 10 enten kunne fremføre banen kontinuerligt eller i spring og ap-paratet vil i afhængighed heraf enten omfatte midler til 25 at fremføre banen fra forrådsrullen, så der som følge af den diskrete fremføring ikke opstår voldsomme spændinger i banen 50.As is known in the prior art, the cylinder 10 will either be able to advance the web continuously or in leaps and the apparatus will, as a result, either comprise means for conveying the web from the supply roll, so that, due to the discrete conveying, no excessive stresses arise in the web. 50th

Fig. 3 viser hvordan et punkt på den på fig. 4 viste kniv 30 40's æg 49 beregnes, samt viser de væsentligste parametre for knivæggens form. Et punkt på knivæggen er betegnet med P og linien K er parallel med cylinderaksen og går igennem punktet P. De stiplede linier L og M markerer stempelstængernes bevægelsesretning og afstanden mellem 35 stempelstængerne er markeret med c. Punktet 0 er befæsti-gelsespunktet til den ene stempelstang, hvorom kniven kan dreje sig. Et punkt G er knivens befæstigelsespunkt til 8FIG. 3 shows how a point of the FIG. 4, the eggs 49 of the knife 30 40 are calculated, and show the most important parameters for the shape of the knife wall. A point on the knife wall is denoted P and the line K is parallel to the cylinder axis and passes through the point P. The dotted lines L and M mark the direction of movement of the piston rods and the distance between the 35 piston rods is marked with c. The point 0 is the point of attachment to the one piston rod. , around which the knife can turn. A point G is the blade attachment point to 8

DK 165737BDK 165737B

den anden stempelstang, og dette befæstigelsespunkt holdes af en lineær føring. En linie B går igennem befæsti-gelsespunkterne 0, G. Knivens befæstigelsespunkter kan dreje sig omkring en linie A. Krumtapakslen drejer med en 5 drejningsvinkel v og krumtappene er indbyrdes vinkelfor skudte w. Afstanden mellem punktet P på knivæggen og linien A, hvorom befæstigelsespunkterne kan bevæge sig, er angivet med a. R, u er radiusvektor til P i et polært koordinatsystem med 0 som origo og B som grundlinie, mens 10 X, Y er de tilsvarende retvinklede koordinater til P. ri og r2 er de to befæstigelsespunkter o og G's maksimale afstand fra linien A. Med på passende vis at opstille ligninger for punktet P, kan man lade en datamat beregne en mulig udformning af knivæggens form. Dette kan gøres, 15 når en række af de maskinbetingede parametre er fastlagt. Herefter kan man f.eks. opnå den i fig. 5a viste knivform, hvor linien P markerer knivens æg og linien B markerer den linie, der går igennem knivens befæstigelsespunkter. Fig. 5b viser hvorledes kniven vil bevæge sig 20 ved det valgte eksempel, hvor fire forskellige knivstillinger er vist samtidigt. Linierne P, B er markeret med samhørende indeksnumre, således at kniven i den første stilling (PI, Bl) bringes i kontakt med cylinderens knivæg, hvilket er markeret med I. Herefter fortsætter en 25 fremføring af kniven, så at skærepunktet føres mod venstre og er markeret med II svarende til knivstillingen (P2, B2). Befæstigelsespunktet i knivens venstre side fortsætter med at blive ført frem, mens tilbageføringen af befæstigelsespunktet i højre side allerede er startet, 30 hvor skærepunktet er ført over i venstre side og markeret med III, mens knivæggens højre side i denne stilling (P3, B3) er ved at forlade cylinderen. Ved den sidste stilling (P4, B4) er en væsentlig del af kniven ført ud af cylinderen, og selve afskæringen er ved at være afsluttet, 35 hvorefter også det venstre befæstigelsespunkt føres tilbage. Ved at tilvirke knivæggen med en passende udformning og tilvejebringe en drivmekanisme, der er i stand 9the other piston rod and this point of attachment is held by a linear guide. A line B passes through the attachment points 0, G. The attachment points of the knife can revolve around a line A. The crankshaft rotates at a 5 angle of rotation v and the cranks are angularly shot w. The distance between the point P on the knife wall and the line A through which the points of attachment can move is indicated by a. R, u is the radius vector for P in a polar coordinate system with 0 as origin and B as baseline, while 10 X, Y are the corresponding right angles. coordinates of P. ri and r2 are the two points of attachment o and G of the maximum distance from line A. By appropriately drawing equations for the point P, one can let a computer calculate a possible shape of the knife wall shape. This can be done when a number of the machine-related parameters are determined. Then you can, for example, obtain the one shown in FIG. 5a, the line P marks the knife's egg and the line B marks the line passing through the knife attachment points. FIG. 5b shows how the knife will move 20 in the selected example, where four different knife positions are shown simultaneously. The lines P, B are marked with corresponding index numbers, so that the knife in the first position (PI, B1) is brought into contact with the knife blade of the cylinder, which is marked with I. Thereafter, a cutting of the knife continues so that the cutting point is moved to the left and is marked with II corresponding to the knife position (P2, B2). The point of attachment in the left side of the knife continues to be advanced, while the reversal of the point of attachment in the right side has already started, 30 where the point of intersection is moved to the left side and marked with III, while the right side of the knife wall in this position (P3, B3) is by leaving the cylinder. At the last position (P4, B4), a substantial part of the knife is moved out of the cylinder and the cutting itself is completed, after which the left fastening point is also returned. By fabricating the knife wall with a suitable design and providing a drive mechanism capable of 9

DK 165737BDK 165737B

til at påføre kniven en vuggende bevægelse, kan man således opnå, at en væsentlig del af kniven er ført ud af cylinderen inden afskæringens afslutning, hvorved den kendte tekniks voldsomme bevægelser og kraftige acceleratio-5 ner undgås.Thus, in order to impart a rocking motion to the knife, it is possible to obtain a substantial part of the knife from the cylinder before the end of the cutting, thus avoiding the violent movements and strong accelerations of the prior art.

Fig. 6 viser en foretrukken udførelsesform af den i fig.FIG. 6 shows a preferred embodiment of the embodiment shown in FIG.

1 og 4 viste cylinder, hvor en del af den overflade af sektionen 11, der er i kontakt med foliebanen 50 er til-10 virket med en form for ruhed 14, der f.eks. kan fremkomme ved sandblæsning. Alternativt kan ruhederne bestå i form af linier eller lignende.1 and 4, a portion of the surface of the section 11 in contact with the film web 50 is formed with a form of roughness 14 which e.g. may occur by sand blasting. Alternatively, the roughnesses may be in the form of lines or the like.

15 20 25 30 3515 20 25 30 35

Claims (10)

1. Fremgangsmåde til afskæring af smalle strimler fra en 5 bred bane (50) og omfattende en vinkelsektionsopdelt cylinder (10), samt et skæreorgan, i form af en skærekniv (40), med en skæreæg (45) i cylinderens længderetning, hvilket skæreorgan (40) er indrettet til at skære en strimmel af den brede bane (50) ved indtrængning mellem 10 cylinderens sektioner (11), kendetegnet ved, at skærekniven (40) bevæges, så at en strimmel afskæres ved, at en første ende af skærekniven (40) føres mod cylinderen (10), så skæreæggen (49) danner et skærepunkt, at dette skærepunkt bevæges på tværs af banen (50) under af-15 skæringen med en i hovedsagen konstant vinkel mellem skæreknivens æg (49) og cylinderens længdeakse, og at den første ende af skæreorganet føres tilbage inden afskæringens afslutning.A method of cutting narrow strips from a wide web (50) comprising an angular section divided cylinder (10), and a cutting means, in the form of a cutting knife (40), with a cutting edge (45) in the longitudinal direction of the cylinder, (40) is adapted to cut a strip of the wide web (50) by penetrating between the sections (11) of the cylinder, characterized in that the cutting knife (40) is moved so that a strip is cut off by a first end of the cutting knife (40) is directed toward the cylinder (10) so that the cutting edge (49) forms a cutting point so that this cutting point is moved transversely of the web (50) during the cutting with a generally constant angle between the cutting blade's eggs (49) and the longitudinal axis of the cylinder. and that the first end of the cutting means is returned before the end of the cut. 2. Apparatur til afskæring af smalle strimler fra en bred bane (50) og omfattende en vinkelsektionsopdelt cylinder (10), samt et skæreorgan, i form af en skærekniv (40), med en skæreæg (49) i cylinderens længderetning, og som er indrettet til at skære en strimmel af den brede bane 25 (50) ved indtrængning mellem cylinderens sektioner (11), kendetegnet ved, at der findes midler (42-48) til bevægelse af skærekniven (40), så at en strimmel afskæres, ved at en første ende af skæreorganet føres mod cylinderen (10), så skæreæggen (49) danner et skærepunkt, 30 som under afskæringen bevæges på tværs af bane (50) med en i hovedsagen konstant vinkel mellem skæreorganets æg (49) og cylinderens længdeakse, og så at skæreorganets første ende føres tilbage inden afskæringens afslutning.An apparatus for cutting narrow strips from a wide web (50) comprising an angular section divided cylinder (10), and a cutting means, in the form of a cutting knife (40), with a cutting edge (49) in the longitudinal direction of the cylinder, which is adapted to cut a strip of the wide web 25 (50) by penetrating between the sections (11) of the cylinder, characterized in that means (42-48) are provided for moving the cutting knife (40) so that a strip is cut, by a first end of the cutting means being directed toward the cylinder (10) so that the cutting edge (49) forms a cutting point 30 which, during the cutting, moves transversely along the web (50) at a substantially constant angle between the cutting member's eggs (49) and the longitudinal axis of the cylinder, and so that the first end of the cutting member is returned before the end of the cutting. 3. Apparatur ifølge krav 2, kendetegnet ved, at den i og for sig kendte vinkel sektionsopdel te cylinder (10) desuden omfatter et antal i længderetningen tilvir- DK 165737 B 11 kede skærende æg.Apparatus according to claim 2, characterized in that the angular sectional cylinder (10) known per se additionally comprises a number of longitudinally cut cutting eggs. 4. Apparatur ifølge krav 2 eller 3, kendetegnet ved, at skæreorganet bringes til bevægelse af to krum- 5 tappe (43), der drejes med samme vinkelhastighed, men er indbyrdes vinkelforskudte.Apparatus according to claim 2 or 3, characterized in that the cutting means is moved by two crankshafts (43) which are rotated at the same angular speed but are angularly displaced. 5. Apparatur ifølge krav 2-4, kendetegnet ved, at midlerne (42-48) til bevægelse af skærekniven (40) 10 omfatter stempelstænger (42), der er bevægeligt forbundet til respektive bevægelsespunkter (47, 48) i skæreorganets ender, og at stempelstængerne er fastgjort til respektive krumtappe (43) gennem plejIstænger (44).Apparatus according to claims 2-4, characterized in that the means (42-48) for moving the cutting knife (40) 10 comprise piston rods (42) which are movably connected to respective points of movement (47, 48) at the ends of the cutting means, and the piston rods are secured to respective cranks (43) through plunger rods (44). 6. Apparatur ifølge krav 5, kendetegnet ved, at skærekniven (40) kan dreje om det ene befæstigelsespunkt (48), og at det andet befæstigelsespunkt (47) omfatter en lineær føring i skæreorganets længderetning.Apparatus according to claim 5, characterized in that the cutting knife (40) can rotate one of the fastening point (48) and the other fastening point (47) comprises a linear guide in the longitudinal direction of the cutting means. 7. Apparatur ifølge krav 2-6, kendetegnet ved, at den vinkelsektionsopdelte cylinder (10) omfatter midler (12, 14) til løselig fastholdelse af såvel banen (50) som de afskårne strimler.Apparatus according to claims 2-6, characterized in that the angular section divided cylinder (10) comprises means (12, 14) for releasably holding both the web (50) and the cut strips. 8. Apparatur ifølge krav 7, kendetegnet ved, at cylinderens sektioner (11) omfatter et antal i cylinderens længderetning anbragte sugehuller (12).Apparatus according to claim 7, characterized in that the sections (11) of the cylinder comprise a number of suction holes (12) arranged in the longitudinal direction of the cylinder. 9. Apparatur ifølge krav 7 eller 8, kendetegnet 30 ved, at der på cylinderoverfladen er tilvirket område med ruheder (14) i forbindelse med sugehullerne (12).Apparatus according to claim 7 or 8, characterized in that a region of roughness (14) is formed on the cylinder surface in connection with the suction holes (12). 10. Apparatur ifølge krav 9, kendetegnet ved, at ruhederne (14) er tilvirket ved sandblæsning. 35Apparatus according to claim 9, characterized in that the roughnesses (14) are made by sandblasting. 35
DK157590A 1990-06-29 1990-06-29 PROCEDURE FOR CUTTING OFF WIDTHS FROM A WIDE COAT, AND APPARATUS FOR EXERCISING THE PROCEDURE DK165737C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DK157590A DK165737C (en) 1990-06-29 1990-06-29 PROCEDURE FOR CUTTING OFF WIDTHS FROM A WIDE COAT, AND APPARATUS FOR EXERCISING THE PROCEDURE
PCT/DK1991/000178 WO1992000169A1 (en) 1990-06-29 1991-06-28 A method of cutting strips from a wide web as well as an apparatus for performing the method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK157590 1990-06-29
DK157590A DK165737C (en) 1990-06-29 1990-06-29 PROCEDURE FOR CUTTING OFF WIDTHS FROM A WIDE COAT, AND APPARATUS FOR EXERCISING THE PROCEDURE

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DK157590D0 DK157590D0 (en) 1990-06-29
DK157590A DK157590A (en) 1991-12-30
DK165737B true DK165737B (en) 1993-01-11
DK165737C DK165737C (en) 1993-06-14

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FI97339C (en) * 1995-04-26 1996-12-10 Valmet Corp Web cutting device
JP6269405B2 (en) * 2014-09-12 2018-01-31 Jfeスチール株式会社 Rolling cut shear shear blade
CN105437279B (en) * 2015-11-02 2017-05-03 庆元县农福食用菌研究所 Adhesive flake cutting machine used for tremella producing
CN110421616A (en) * 2019-08-05 2019-11-08 山东联众包装科技有限公司 A kind of packaging bag shear for heat shrink films
GB2589122B (en) 2019-11-21 2022-01-26 Illinois Tool Works Label cutter

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SE413750B (en) * 1978-09-28 1980-06-23 Svenska Kassaregister Cutting apparatus for tape, sheets or similar items made of paper or similar material
DE3403902C1 (en) * 1984-02-04 1985-05-30 ADS-Anker GmbH, 4800 Bielefeld Cutting device for document-producing business machines

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DK165737C (en) 1993-06-14
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DK157590D0 (en) 1990-06-29

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