EP0277260B1 - Device for cutting foils - Google Patents

Device for cutting foils Download PDF

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Publication number
EP0277260B1
EP0277260B1 EP87102828A EP87102828A EP0277260B1 EP 0277260 B1 EP0277260 B1 EP 0277260B1 EP 87102828 A EP87102828 A EP 87102828A EP 87102828 A EP87102828 A EP 87102828A EP 0277260 B1 EP0277260 B1 EP 0277260B1
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EP
European Patent Office
Prior art keywords
cutting knife
knife
cutting
counterknife
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP87102828A
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German (de)
French (fr)
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EP0277260A2 (en
EP0277260A3 (en
Inventor
Reinhard Blatter
Heinz Dohnalek
Michael J. Mehltretter
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IBSM Mehltretter GmbH
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IBSM Mehltretter GmbH
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Publication of EP0277260A3 publication Critical patent/EP0277260A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting 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
    • B26D1/01—Cutting 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
    • B26D1/12—Cutting 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
    • B26D1/14—Cutting 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 circular cutting member, e.g. disc cutter
    • B26D1/24—Cutting 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 circular cutting member, e.g. disc cutter coacting with another disc cutter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting 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
    • B26D1/0006—Cutting members therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2614—Means for mounting the cutting member
    • B26D7/2621—Means for mounting the cutting member for circular cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting 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
    • B26D1/0006—Cutting members therefor
    • B26D2001/0046—Cutting members therefor rotating continuously about an axis perpendicular to the edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting 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
    • B26D1/0006—Cutting members therefor
    • B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting 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
    • B26D1/0006—Cutting members therefor
    • B26D2001/0066—Cutting members therefor having shearing means, e.g. shearing blades, abutting blades

Definitions

  • the invention relates to a device for cutting film webs, e.g. thin, coated plastic films for magnetic tapes and the like according to the preamble of claim 1.
  • a cutting device for thin web material is known from the generic DE-PS 968 269.
  • a circular cutting knife interacts with a likewise circular counter-knife offset in the radial direction to form circular scissors, the cutting knife being set axially against the counter-knife for cutting.
  • the circular cutting knife which is elastic on its own, is interchangeably received in a rigid support member, which in turn is axially displaceable on a hub flange of a knife shaft. The axial travel of the support member is suspended by a so-called worm spring and limited by a stop.
  • the aim of this arrangement of the support member is to produce a cutting unit which on the one hand consumes as little as possible of the material which is naturally expensive for cutting knives and on the other hand forms a frustoconical shape in the cutting area with simultaneous rigidity.
  • the area of the cutting unit in contact with the counter knife is offset in the axial direction against the worm spring, so that this results in a spring-loaded pressing.
  • this offset consists of a pure axial displacement of the cutting unit and, superimposed on it, due to the asymmetrical eccentric load from a tilting movement about a parallel to a radial axis.
  • the cutting unit with the cutting knife is completely rigid in comparison to the worm spring, there is practically no axial displacement due to the strong eccentric load and the narrow bearing seat.
  • the fit of the support member on the hub flange must be dimensioned with ample play in order to allow sufficient tilting movement and thus to allow an adjustment path with the consequence of a resilient pressure of the cutting unit on the counter knife.
  • this large play between the support member and the hub flange which in operation increases due to the constantly changing tilting movement of the knife shaft due to wear, it is not possible to maintain a very slight overlap of a few tenths of a millimeter in the radial direction receive; Such a small overlap is to be aimed for in order to achieve the highest cutting edge quality.
  • this tilting movement reduces the originally linear contact of the cutting knife on the counter knife to a two-point contact at the end of the line area while at the same time lifting the intermediate peripheral area of the cutting knife off the counter knife.
  • the cut edge quality of the processed web material deteriorates considerably.
  • this two-point system leads to increased edge pressure with the accompanying phenomenon of very heavy wear.
  • the invention has for its object to provide a cutting device which uses interchangeable cutting blades which are flat in the dismantled state and truncated cone-shaped in the installed state, an excellent cutting quality of the cut material and a long service life of the cutting knife being achieved. Furthermore, the radial overlap of the cutting knife and counter knife should be able to assume the lowest values and, at the same time, the arrangement of several knives with a minimal axial distance should be possible.
  • the feed path is completely absorbed by the elastic deformation of the cutting knife, so that an axially movable support member for the cutting knife is eliminated or can be formed in one piece with the hub flange.
  • the latter can, however, be firmly attached to the knife shaft without taking an axial path into account with the smallest axial dimensions. This enables the arrangement of several knives at small axial distances and thus the simultaneous cutting of very narrow strips.
  • the tilting movement is reduced to a minimum and is furthermore irrelevant for the function: namely, due to the bead-like deformation of the cutting knife in the contact area Possibly slight tilting is compensated for by the line or surface contact that always occurs as a result of the elastic clamping. Since the resilient abutment of the cutting knife against the counter knife is effected in itself by the elasticity of the cutting knife, the cutting knife can be centered on the hub flange regardless of a required tilting movement, and thus this fit can be measured with the tightest tolerances. This makes it possible to maintain a very small depth of overlap between the grooving knife and the cutting knife even over a longer operating period.
  • FIG. 1 shows the basic principle for the elastic clamping of an annular, flat cutting knife (1) when the cutting knife is deformed into a truncated cone shape while at the same time maintaining its elasticity, in particular in its outer edge region.
  • the two side surfaces of the cutting knife (1) are each subjected to line forces on circular lines with different diameters d and D, so that the originally flat cutting knife bulges into the shape of a truncated cone (shown in broken lines).
  • the forces, the knife material and the resulting axial deflection are dimensioned such that the cutting knife returns to its flat, planar shape after the force is removed. This advantageously enables the radial regrinding of an entire package of cutting knives placed against one another in one operation.
  • the cutting knife (1) Since the cutting knife (1) is only subject to line loads and is otherwise freely absorbed, its elasticity is retained even after the clamping, so that a bead-like deformation of the circumferential section in contact with the counter knife is made possible.
  • Figure 2 shows a clamping device for several cutting knives, in which the frustoconical curvature of the cutting knives (1) is achieved by a hub flange (5) which is divided into rings (5a) in the axial direction.
  • the rings (5a) are preferably of identical design and axially pressed together in the assembled state and firmly on a knife shaft (3).
  • the flat cutting knife is elastically deformed by circular edges (9 and 11) with the diameters d and D.
  • the width and the depth of a circumferential groove (7) formed by the rings (5a) are dimensioned such that the cutting knife (1) can deflect freely into the frustum of a cone.
  • the desired deflection can be achieved by appropriate dimensioning of the edges (9 and 11).
  • FIG. 2 shows the interaction of the cutting knife (1) with a slot knife (19) on a counter knife shaft (21) in the operating state. It can be seen that the cutting knife (1) remains in contact with the edges (9 and 11) and therefore the favorable interaction with the grooving knife (19) is ensured while maintaining the shape of the truncated cone.
  • the axial feed path when adjusting the knife shafts (3 and 21) against one another is dimensioned such that only a part of the deformation of the cutting knife (1) is canceled in its contacting circumferential area with the counter knife (13) and in a flap-like, flat-shaped contact with the counter knife transforms.
  • Figure 3 shows the implementation of the principle of Figure 1 with a plate spring (13) with a suitable coordination of the geometry and force ratios.
  • the outer diameter of the plate spring (13) is significantly larger than the outer circumference of a hub flange (5).
  • the plate spring (13) mainly serves to deform the cutting knife into its truncated cone shape, while the employment is taken up by the elastic bead-like deformation of its contacting peripheral region.
  • the hub flange (5) is also subdivided into rings (5a) with a stepped design, which additionally enables safe and exact mounting when the cutting knives (1) and the plate springs (13) are mounted on the knife shaft (3).
  • FIG. 4 shows an advantageous development of the device according to FIG. 3.
  • a ring (5a) is provided with two edges (17 and 17 ') which correspond to the inclination of the cutting knife surface as desired.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Schneiden von Folienbahnen wie z.B. dünnen, beschichteten Kunststoffolien für Magnetbänder und dergleichen gemäß dem Oberbegriff von Patentanspruch 1.The invention relates to a device for cutting film webs, e.g. thin, coated plastic films for magnetic tapes and the like according to the preamble of claim 1.

Aus der gattungsbildenden DE-PS 968 269 ist eine Schneidvorrichtung für dünnes Bahnenmaterial bekannt. Bei dieser Vorrichtung wirkt ein kreisförmiges Schneidmesser mit einem ebenfalls kreisförmigen, in Radialrichtung versetzten Gegenmesser zur Bildung einer Kreisschere zusammen, wobei das Schneidmesser zum Schneiden axial gegen das Gegenmesser angestellt wird. Bei der bekannten Vorrichtung ist das kreisförmige Schneidmesser, das für sich allein betrachtet elastisch ist, austauschbar in einem in sich starren Tragglied aufgenommen, welches seinerseits axial verschieblich auf einem Nabenflansch einer Messerwelle sitzt. Der Axialweg des Traggliedes ist mittels einer sogenannten Wurmfeder gefedert und durch einen Anschlag begrenzt.A cutting device for thin web material is known from the generic DE-PS 968 269. In this device, a circular cutting knife interacts with a likewise circular counter-knife offset in the radial direction to form circular scissors, the cutting knife being set axially against the counter-knife for cutting. In the known device, the circular cutting knife, which is elastic on its own, is interchangeably received in a rigid support member, which in turn is axially displaceable on a hub flange of a knife shaft. The axial travel of the support member is suspended by a so-called worm spring and limited by a stop.

Ziel dieser Anordnung des Traggliedes ist es, eine Schneideinheit herzustellen, die einerseits möglichst wenig von dem für Schneidmesser naturgemäß teurem Werkstoff verbraucht und andererseits eine kegelstumpfartige Form im Schneidbereich bei gleichzeitiger Starrheit ausbildet. Dies wird dadurch erreicht, daß das starre Tragglied das Schneidmesser an dessen Innendurchmesser in einer Umfangsnut fest aufnimmt und über eine sich daran anschließende Radial-Kegelfläche in die Kegelstumpfform bringt; durch die feste Einspannung des Schneidmessers und seine flächige Abstützung über die Radial-Kegelfläche ist eine im wesentlichen in sich starre Schneideinheit gebildet, die einem kegelstumpfförmig geschliffenen Schneidmesser mit dicker Wandstärke bei erheblichem Materialverbrauch gleichzusetzen ist (solche Messer sind ebenfalls Stand der Technik).The aim of this arrangement of the support member is to produce a cutting unit which on the one hand consumes as little as possible of the material which is naturally expensive for cutting knives and on the other hand forms a frustoconical shape in the cutting area with simultaneous rigidity. This is achieved in that the rigid support member firmly receives the cutting knife on its inside diameter in a circumferential groove and brings it into the truncated cone shape via an adjoining radial conical surface; Due to the firm clamping of the cutting knife and its flat support over the radial conical surface, an essentially rigid cutting unit is formed, which can be equated to a truncated cone-shaped cutting knife with thick wall thickness and considerable material consumption (such knives are also state of the art).

Wird nun zum Schneiden von Folien oder dergleichen das Schneidmesser bzw. die Schneideinheit gegen das Gegenmesser angestellt, erfolgt ein Versatz des mit dem Gegenmesser in Berührung stehenden Bereichs der Schneideinheit in Axialrichtung gegen die Wurmfeder, so daß hierdurch ein gefedertes Andrücken bewirkt ist. Dieser Versatz setzt sich prinzipiell aus einer reinen Axialverschiebung der Schneideinheit und, dieser überlagert, aufgrund der unsymmetrischen außermittigen Belastung aus einer Kippbewegung um eine Parallele zu einer Radialachse zusammen. Da jedoch die Schneideinheit mit dem Schneidmesser im Vergleich zur Wurmfeder in sich völlig starr ist, findet infolge der stark außermittigen Belastung und des schmalen Lagersitzes praktisch keine Axialverschiebung statt. Daher muß die Passung des Tragglieds auf dem Nabenflansch mit reichlichem Spiel dimensioniert sein, um eine ausreichende Kippbewegung zuzulassen und damit einen Anstellweg mit der Folge eines federnden Andrucks der Schneideinheit am Gegenmesser zu ermöglichen. Infolge dieses großen Spiels zwischen Tragglied und Nabenflansch, das sich im Betrieb aufgrund der örtlich ständig wechselnden Kippbewegung bei der Drehung der Messerwelle durch Verschleiß weiter vergrößert, ist es nicht möglich, eine in Radialrichtung sehr geringe Überlappung der beiden Messer von wenigen Zehntel-Millimetern aufrecht zu erhalten; eine derart geringe Überlappung ist zur Erzielung höchster Schnittkantenqualitäten anzustreben.If the cutting knife or the cutting unit is now set against the counter knife for cutting foils or the like, the area of the cutting unit in contact with the counter knife is offset in the axial direction against the worm spring, so that this results in a spring-loaded pressing. In principle, this offset consists of a pure axial displacement of the cutting unit and, superimposed on it, due to the asymmetrical eccentric load from a tilting movement about a parallel to a radial axis. However, since the cutting unit with the cutting knife is completely rigid in comparison to the worm spring, there is practically no axial displacement due to the strong eccentric load and the narrow bearing seat. Therefore, the fit of the support member on the hub flange must be dimensioned with ample play in order to allow sufficient tilting movement and thus to allow an adjustment path with the consequence of a resilient pressure of the cutting unit on the counter knife. As a result of this large play between the support member and the hub flange, which in operation increases due to the constantly changing tilting movement of the knife shaft due to wear, it is not possible to maintain a very slight overlap of a few tenths of a millimeter in the radial direction receive; Such a small overlap is to be aimed for in order to achieve the highest cutting edge quality.

Andererseits wird durch diese Kippbewegung die ursprünglich linienförmige Anlage des Schneidmessers am Gegenmesser zu einer Zwei-Punkt-Anlage am Ende des Linienbereichs bei gleichzeitigem Abheben des dazwischenliegenden Umfangsbereichs des Schneidmessers vom Gegenmesser reduziert. Hierdurch verschlechtert sich die Schnittkantenqualität des bearbeiteten Bahnen-Materials erheblich. Darüber hinaus führt diese Zwei-Punkt-Anlage zu einer erhöhten Kantenpressung mit der Begleiterscheinung von sehr starkem Verschleiß.On the other hand, this tilting movement reduces the originally linear contact of the cutting knife on the counter knife to a two-point contact at the end of the line area while at the same time lifting the intermediate peripheral area of the cutting knife off the counter knife. As a result, the cut edge quality of the processed web material deteriorates considerably. In addition, this two-point system leads to increased edge pressure with the accompanying phenomenon of very heavy wear.

Der Erfindung liegt die Aufgabe zugrunde, eine Schneidvorrichtung zu schaffen, die auswechselbare, im ausgebauten Zustand ebene und im eingebauten Zustand kegelstumpfförmig verwölbte Schneidmesser verwendet, wobei eine hervorragende Schnittqualität des geschnittenen Materials und eine große Standzeit des Schneidmessers erreicht werden soll. Ferner soll die Radialüberlappung von Schneidmesser und Gegenmesser geringste Werte annehmen können und gleichzeitig die Anordnung mehrerer Messer bei minimalem Axialabstand möglich sein.The invention has for its object to provide a cutting device which uses interchangeable cutting blades which are flat in the dismantled state and truncated cone-shaped in the installed state, an excellent cutting quality of the cut material and a long service life of the cutting knife being achieved. Furthermore, the radial overlap of the cutting knife and counter knife should be able to assume the lowest values and, at the same time, the arrangement of several knives with a minimal axial distance should be possible.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale im kennzeichnenden Teil des Hauptanspruches gelöst.This object is achieved by the features in the characterizing part of the main claim.

Durch den Einbau des Schneidmessers in den Nabenflansch auf eine Art und Weise, die die Elastizität des Schneidmessers auch nach dem Einbau erhält, wird beim Anstellen an das Gegenmesser eine wulstartige Verformung seines berührenden Umfangsbereichs erzielt, die in einer weiterhin linienförmigen bis sogar flächenförmigen, und aufgrund der elastischen Verformung auch gefederten Anlageberührung des Schneidmessers am Gegenmesser resultiert. Hierdurch wird die Anpreßkraft von zwei Berührpunkten auf eine Linie bzw. Fläche verteilt und so eine schädliche Kantenpressung vermieden und insgesamt der Anpreßdruck stark reduziert. Eine deutlich größere Standzeit der Messer bei gleichzeitiger Kosteneinsparung durch verlängerte Nachschleifintervalle ist die positive Folge. Darüberhinaus wird der Zustellweg vollkommen durch die elastische Verformung des Schneidmessers aufgenommen, so daß ein axial bewegliches Tragglied für das Schneidmesser entfallen bzw. einstückig mit dem Nabenflansch ausgebildet werden kann. Letzterer kann jedoch ohne Berücksichtigung eines Axialweges bei kleinsten Axialabmessungen fest auf der Messerwelle angebracht sein. Dies ermöglicht die Anordnung von mehreren Messern in kleinen Axialabständen und so den gleichzeitigen Schnitt von sehr schmalen Streifen.By installing the cutting knife in the hub flange in a way that maintains the elasticity of the cutting knife even after installation, a bead-like deformation of its contacting circumferential region is achieved when the counter knife is used, which is in a line-shaped to even sheet-like form, and because of the elastic deformation also results in spring contact of the cutting knife on the counter knife. As a result, the contact pressure is distributed from two points of contact to a line or surface, avoiding harmful edge pressure and greatly reducing the overall contact pressure. The positive result is a significantly longer service life of the knives with simultaneous cost savings due to extended regrinding intervals. In addition, the feed path is completely absorbed by the elastic deformation of the cutting knife, so that an axially movable support member for the cutting knife is eliminated or can be formed in one piece with the hub flange. The latter can, however, be firmly attached to the knife shaft without taking an axial path into account with the smallest axial dimensions. This enables the arrangement of several knives at small axial distances and thus the simultaneous cutting of very narrow strips.

Durch dieses Einspannprinzip des Schneidmessers ist die Kippbewegung auf ein Minimum reduziert und darüberhinaus für die Funktion unmaßgeblich: Durch die wulstartige Verformung des Schneidmessers im Berührbereich nämlich wird ein eventuell geringes Kippen durch die sich infolge der elastischen Einspannung immer einstellende Linien- bzw. Flächenberührung kompensiert. Da die zum Schnitt erforderliche federnde Anlage des Schneidmessers an das Gegenmesser durch die Elastizität des Schneidmessers in sich bewirkt wird, kann das Schneidmesser ohne Rücksicht auf eine erforderliche Kippbewegung auf dem Nabenflansch zentriert und somit diese Passung mit engsten Toleranzen bemessen werden. Hierdurch ist es möglich, auch über einen längeren Betriebszeitraum hinweg, gleichbleibend eine sehr geringe Überlappungstiefe zwischen Nutmesser und Schneidmesser aufrecht zu erhalten.Due to this clamping principle of the cutting knife, the tilting movement is reduced to a minimum and is furthermore irrelevant for the function: namely, due to the bead-like deformation of the cutting knife in the contact area Possibly slight tilting is compensated for by the line or surface contact that always occurs as a result of the elastic clamping. Since the resilient abutment of the cutting knife against the counter knife is effected in itself by the elasticity of the cutting knife, the cutting knife can be centered on the hub flange regardless of a required tilting movement, and thus this fit can be measured with the tightest tolerances. This makes it possible to maintain a very small depth of overlap between the grooving knife and the cutting knife even over a longer operating period.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous refinements and developments of the invention are the subject of the dependent claims.

Durch die Aufteilung des Nabenflansches in Ringe gemäß den Ansprüchen 2 und 3, die Nuten mit umlaufenden konzentrischen Kanten ausbilden, an denen das bzw. die Schneidmesser überwiegend zur Anlage kommen, ist ein einfacher und schneller Austausch insbesondere bei mehreren Schneidmessern auf einer Messerwelle möglich. Die Abmessungen der Kanten der Ringe, die ihrerseits die Geometrie der Kegelstumpfform des Schneidmessers bedingen, sind einfach zu ändern und zu fertigen.Due to the division of the hub flange into rings according to claims 2 and 3, which form grooves with circumferential concentric edges on which the cutting knife or blades predominantly come into contact, a simple and quick exchange is possible, in particular in the case of several cutting knives on a knife shaft. The dimensions of the edges of the rings, which in turn determine the geometry of the truncated cone shape of the cutting knife, are easy to change and manufacture.

Durch die Materialwahl gemäß Anspruch 8 werden äußerst hohe Standzeiten der gesamten Schneidvorrichtung erreicht.Due to the choice of material according to claim 8 extremely long service lives of the entire cutting device are achieved.

Ausführungsbeispiele der Erfindung werden nachstehend anhand der Figuren ausführlich erläutert. Es zeigen:

  • Figur 1 das Prinzip für die Verformung eines Schneidmessers bei Aufrechterhaltung seiner Elastizität,
  • Figur 2 einen Axialschnitt der erfindungsgemäßen Vorrichtung mit mehreren Schneidmessern (die Messerlage im Betrieb ist gestrichelt dargestellt),
  • Figur 3 einen Axialschnitt durch eine weitere Ausführungsform der Erfindung mit Tellerfedern, und
  • Figur 4 einen Axialschnitt einer weiteren erfindungsgemäßen Ausführungsform mit Tellerfedern.
Exemplary embodiments of the invention are explained in detail below with reference to the figures. Show it:
  • 1 shows the principle for the deformation of a cutting knife while maintaining its elasticity,
  • FIG. 2 shows an axial section of the device according to the invention with a plurality of cutting knives (the knife position during operation is shown in dashed lines),
  • Figure 3 shows an axial section through a further embodiment of the invention with disc springs, and
  • Figure 4 shows an axial section of a further embodiment according to the invention with disc springs.

Figur 1 zeigt das Grundprinzip für die elastische Einspannung eines ringförmigen, ebenen Schneidmessers (1) bei Verformung des Schneidmessers in eine Kegelstumpfform unter gleichzeitiger Aufrechterhaltung seiner Elastizität insbesondere in seinem äußeren Randbereich. Die beiden Seitenflächen des Schneidmessers (1) sind auf jeweils kreisförmigen Linien mit unterschiedlichen Durchmessern d bzw. D mit Linienkräften beaufschlagt, - sodaß sich das ursprünglich ebene Schneidmesser in die Kegelstumpfform wölbt (gestrichelt dargestellt). Die Kräfte, das Messermaterial und die daraus resultierende axiale Auslenkung sind so bemessen, daß das Schneidmesser nach Wegfall der Krafteinwirkung wieder seine ebene, plane Form annimmt. Dadurch ist vorteilhafterweise das radiale Nachschleifen eines ganzen Paketes aneinandergelegter Schneidmesser in einem Arbeitsgang möglich.FIG. 1 shows the basic principle for the elastic clamping of an annular, flat cutting knife (1) when the cutting knife is deformed into a truncated cone shape while at the same time maintaining its elasticity, in particular in its outer edge region. The two side surfaces of the cutting knife (1) are each subjected to line forces on circular lines with different diameters d and D, so that the originally flat cutting knife bulges into the shape of a truncated cone (shown in broken lines). The forces, the knife material and the resulting axial deflection are dimensioned such that the cutting knife returns to its flat, planar shape after the force is removed. This advantageously enables the radial regrinding of an entire package of cutting knives placed against one another in one operation.

Da das Schneidmesser (1) nur Linienlasten unterliegt und ansonsten frei aufgenommen ist, bleibt seine Elastizität auch nach der Einspannung erhalten, so daß eine wulstartige Anlageverformung des jeweils mit dem Gegenmesser in Berührung stehenden Umfangsabschnitts ermöglicht ist.Since the cutting knife (1) is only subject to line loads and is otherwise freely absorbed, its elasticity is retained even after the clamping, so that a bead-like deformation of the circumferential section in contact with the counter knife is made possible.

Figur 2 zeigt eine Einspannvorrichtung für mehrere Schneidmesser, bei der die kegelstumpfförmige Verwölbung der Schneidmesser (1) durch einen Nabenflansch (5) erzielt ist, der in Axialrichtung in Ringe (5a) unterteilt ist. Die Ringe (5a) sind vorzugsweise gleich ausgebildet und im montierten Zustand axial aneinandergepreßt und fest auf einer Messerwelle (3). Durch kreisförmige Kanten (9 und 11) mit den Durchmessern d und D wird das ebene Schneidmesser elastisch verformt. Die Breite und die Tiefe einer durch die Ringe (5a) gebildeten Umfangsnut (7) sind so bemessen, daß das Schneidmesser (1) unbehindert in die Kegelstumpfform auslenken kann. Durch entsprechende Bemessungen der Kanten (9 und 11) kann exakt die gewünschte Auslenkung erzielt werden.Figure 2 shows a clamping device for several cutting knives, in which the frustoconical curvature of the cutting knives (1) is achieved by a hub flange (5) which is divided into rings (5a) in the axial direction. The rings (5a) are preferably of identical design and axially pressed together in the assembled state and firmly on a knife shaft (3). The flat cutting knife is elastically deformed by circular edges (9 and 11) with the diameters d and D. The width and the depth of a circumferential groove (7) formed by the rings (5a) are dimensioned such that the cutting knife (1) can deflect freely into the frustum of a cone. The desired deflection can be achieved by appropriate dimensioning of the edges (9 and 11).

Die gestrichelte Darstellung in der Figur 2 zeigt das Zusammenwirken des Schneidmessers (1) mit einem Nutmesser (19) auf einer Gegenmesserwelle (21) im Betriebszustand. Es ist ersichtlich, daß das Schneidmesser (1) mit den Kanten (9 und 11) in Berührung bleibt und demnach das günstige Zusammenwirken mit dem Nutmesser (19) unter Aufrechterhaltung der Kegelstumpfform gewährleistet ist.The broken line in FIG. 2 shows the interaction of the cutting knife (1) with a slot knife (19) on a counter knife shaft (21) in the operating state. It can be seen that the cutting knife (1) remains in contact with the edges (9 and 11) and therefore the favorable interaction with the grooving knife (19) is ensured while maintaining the shape of the truncated cone.

Der axiale Zustellweg beim Anstellen der Messerwellen (3 und 21) gegeneinander ist so bemessen, daß nur ein Teil der Verformung des Schneidmessers (1) in seinem berührenden Umfangsbereich mit dem Gegenmesser (13) aufgehoben wird und in eine lappenartige, flächenförmige Anlage an das Gegenmesser übergeht.The axial feed path when adjusting the knife shafts (3 and 21) against one another is dimensioned such that only a part of the deformation of the cutting knife (1) is canceled in its contacting circumferential area with the counter knife (13) and in a flap-like, flat-shaped contact with the counter knife transforms.

Figur 3 zeigt die Realisierung des Prinzips nach Figur 1 mit einer Tellerfeder (13) bei geeigneter Abstimmung der Geometrie- und Kraftverhältnisse. So ist der Außendurchmesser der Tellerfeder (13) deutlich größer als ein äußerer Umfang eines Nabenflansches (5). Die Tellerfeder (13) dient hierbei überwiegend zur Verformung des Schneidmessers in seine Kegelstumpfform, während die Anstellung durch die elastische wulstartige Verformung seines berührenden Umfangsbereichs aufgenommen wird. Der Nabenflansch (5) ist ebenfalls in Ringe (5a) mit stufenförmiger Ausbildung unterteilt, wodurch zusätzlich eine sichere und exakte Montage beim Aufspannen der Schneidmesser (1) und der Tellerfedem (13) auf der Messerwelle (3) ermöglicht wird. Da die Schneidmesser (1) auf dem Absatz des einen Ringes (5a) über den Durchmesser dsch bereits beim losen Zusammensetzen der Teile sicher zentriert sind und auch die Tellerfedern (13) auf einem gesonderten Ringabsatz (23) des anderen Ringes sitzen, kann beim Zusammenbau weder ein Schneidmesser noch eine Tellerfeder zwischen den Ringen eingeklemmt werden. In der Figur 3 stellt der gestrichelte Figuranteil ebenfalls den Betriebszustand dar.Figure 3 shows the implementation of the principle of Figure 1 with a plate spring (13) with a suitable coordination of the geometry and force ratios. The outer diameter of the plate spring (13) is significantly larger than the outer circumference of a hub flange (5). The plate spring (13) mainly serves to deform the cutting knife into its truncated cone shape, while the employment is taken up by the elastic bead-like deformation of its contacting peripheral region. The hub flange (5) is also subdivided into rings (5a) with a stepped design, which additionally enables safe and exact mounting when the cutting knives (1) and the plate springs (13) are mounted on the knife shaft (3). Since the cutting knives (1) on the shoulder of one ring (5a) over the diameter ds ch are already centered when the parts are loosely assembled and the disc springs (13) are also seated on a separate ring shoulder (23) of the other ring Assemble neither a cutting knife nor a disc spring between the rings. In Figure 3, the dashed figure portion also represents the operating state.

Figur 4 zeigt eine vorteilhafte Weiterbildung der Vorrichtung nach Figur 3. Ein Ring (5a) ist mit zwei Kanten (17 und 17') versehen, die bei entsprechender Abstufung die Neigung der Schneidmesserfläche nach Wunsch festlegen.FIG. 4 shows an advantageous development of the device according to FIG. 3. A ring (5a) is provided with two edges (17 and 17 ') which correspond to the inclination of the cutting knife surface as desired.

Claims (9)

1. Device for cutting film-like material, comprising at least one circular cutting knife (1) elastic per se which is received exchangeably in a hub flange (5) of a knife driving shaft (3) and which in dismounted state is formed completely plane and in mounted state is curved in the form of a truncated cone, said cutting knife (1) being biased and axially inclined towards a likewise circular counterknife (19), characterized in that said hub flange (5) is located rigidly on said knife driving shaft (3) and receives said cutting knife (1) in such a way that the elasticity thereof remains unchanged in the mounted state, whereby in the inclined condition that portion of said cutting knife (1) which is in engagement with said counterknife (19) comes into contact with said counterknife (17) by way of an elastic deformation, the contact area being a line or approximately a surface.
2. Device according to claim 1, characterized in that said hub flange (5) comprises at least two rings (5a) which can be pressed against each other in axial direction and which for receiving said cutting knife (1) form a circumferential groove (7) having stepped off radial surfaces, said steps having circular edges (9, 11) of different diameters (d, D) and being dimensioned in axial direction in such a manner that when pressing said rings (5a) against each other, said circular edge (9) having the smaller diameter (d) of the one ring deflects said cutting knife (1) near its inner diameter (dsch) from the plane of said cutting knife, while said circular edge (11) having the greater diameter (D) of the other ring deflects said cutting knife (1) into the opposite direction (Fig. 2).
3. Device according to claim 1, characterized in that said hub flange (5) comprises at least two rings (5a) which can be pressed against each other in axial direction and which for receiving said rutting knife (1) form a circumferential groove (7) having stepped off radial surfaces, said circumferential groove (7) receiving a cup spring (13) having a greater external diameter (Dreuerr.) than a circumferential edge (17) of said rings (5a), which resiliently engages said cutting knife (1) with said radial surface of said one ring, and wherein the spring force of said cup spring (13) and the thickness (15) of said cutting knife (1) harmonize with each other in such a manner that said cup spring deforms said cutting knife (1) beyond said circumferential edge (17) of said one ring (5a) axially to bring it in the truncated cone form while maintaining the elasticity of its circumferential portion (Fig. 3).
4. Device according to claim 1 or claim 3, characterized in that the radial surface of said one ring comprises two edge (17, 17'), the diameters of which harmonize with each other in accordance with the desired deflection of said cutting knife (1) (Fig. 4).
5. Device according to one of claims 3 or 4, characterized in that said circumferential groove (7) receiving said cutting knife (1) is obviously larger than the thickness (15) of said cutting knife (1) and in that said cup spring (13) is located on a stop (23) of said other ring (5a), the diameter of which is greater than the inner: diameter (dsch) of said cutting knife (1).
6. Device according to one of the preceding claims, characterized in that a multitude of cutting knives (1) is arranged on said knife driving shaft (3) which cooperate with a respective number of cutter bars (19) on the counterknife driving shaft (21).
7. Device according to one of the preceding claims, characterized in that the feed distance motion of said cutting knife (1) with respect to said counterknife (19) is so small that the truncated cone form of said cutting knife (1) and therewith a clearance anile remain retained (Figs. 2 and 3, dotted line portions).
8. Device according to one of the preceding claims, characterized in that said cutting knife (1) and said counterknife (19) are made of hard metal.
9. Device according to one of the preceding claims, characterized in that said cutting knife (1) has a thickness (15) of from 0.4 to 0.5 mm.
EP87102828A 1986-12-09 1987-02-27 Device for cutting foils Expired - Lifetime EP0277260B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3642005 1986-12-09
DE3642005A DE3642005C1 (en) 1986-12-09 1986-12-09 Device for cutting sheet-like materials

Publications (3)

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EP0277260A2 EP0277260A2 (en) 1988-08-10
EP0277260A3 EP0277260A3 (en) 1988-10-19
EP0277260B1 true EP0277260B1 (en) 1990-10-03

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EP87102828A Expired - Lifetime EP0277260B1 (en) 1986-12-09 1987-02-27 Device for cutting foils

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EP (1) EP0277260B1 (en)
JP (1) JPS63144995A (en)
KR (1) KR920007590B1 (en)
DE (1) DE3642005C1 (en)

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US5286159A (en) * 1990-11-08 1994-02-15 Kabushiki Kaisha Aichi Corporation Mobile vehicular apparatus with aerial working device
US5200674A (en) * 1990-11-16 1993-04-06 Aichi Sharyo Co., Ltd. Electric power supply device for mobile vehicular apparatus with aerial cabin having force-feedback manipulator
DE4132120A1 (en) * 1991-09-26 1993-04-01 Gerhardt Int As DEVICE FOR CUTTING, CUTTING, PERFORATING OR PERFORATING PLANT MATERIAL AND METHOD FOR THE PRODUCTION THEREOF
US5621089A (en) * 1992-05-27 1997-04-15 Novo Nordisk Biotech, Inc. Nucleic acid constructs for the production of a Bacillus alkaline protease
US9039855B2 (en) 2012-03-30 2015-05-26 The Procter & Gamble Company Apparatuses and methods for making absorbent articles
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US9050213B2 (en) 2012-03-30 2015-06-09 The Procter & Gamble Company Apparatuses and methods for making absorbent articles
US8440043B1 (en) 2012-03-30 2013-05-14 The Procter & Gamble Company Absorbent article process and apparatus for intermittently deactivating elastics in elastic laminates
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Also Published As

Publication number Publication date
EP0277260A2 (en) 1988-08-10
DE3642005C1 (en) 1988-03-03
KR920007590B1 (en) 1992-09-08
JPH057152B2 (en) 1993-01-28
EP0277260A3 (en) 1988-10-19
JPS63144995A (en) 1988-06-17
KR880007184A (en) 1988-08-26

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