EP2422941B1 - Cutting blade with cornerless non-circular central recess - Google Patents

Cutting blade with cornerless non-circular central recess Download PDF

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Publication number
EP2422941B1
EP2422941B1 EP11178248.8A EP11178248A EP2422941B1 EP 2422941 B1 EP2422941 B1 EP 2422941B1 EP 11178248 A EP11178248 A EP 11178248A EP 2422941 B1 EP2422941 B1 EP 2422941B1
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EP
European Patent Office
Prior art keywords
knife disc
drive shaft
recess
centre recess
entrainer
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.)
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EP11178248.8A
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German (de)
French (fr)
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EP2422941A1 (en
Inventor
Bernhard Teufel
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Individual
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Individual
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Priority to PL11178248T priority Critical patent/PL2422941T3/en
Publication of EP2422941A1 publication Critical patent/EP2422941A1/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
    • B26D1/143—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 rotating about a stationary axis
    • B26D1/1435—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 rotating about a stationary axis for thin material, e.g. for sheets, strips or the like
    • 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

Definitions

  • Such cutting discs are known in many forms, the cutting discs, seen in plan view, differ essentially by their diameter, the shape of the central recess and the possible presence of further recesses.
  • the central recess As a circular recess.
  • the central recess can - depending on the configuration - be relatively small or relatively large.
  • a purely circular Mittenaus strictlyung does not allow a rotationally fixed connection to the drive shaft. Therefore, additional measures have been taken in the prior art cutting wheels to transfer the torque from the drive shaft to the cutter disk.
  • the number of further holes or recesses varies. In some cases, only a single such recess or hole is present. In other cases, the number of holes or recesses is two. Also more than two such Holes or recesses are known. Sometimes, up to six such recesses or holes are present.
  • central recess substantially circular, but, starting from the per se circular recess, at least one radially outwardly facing U-shaped recess is arranged.
  • the number of U-shaped recesses varies again. Minimal, a single such recess is present. There are also embodiments with more than one such U-shaped recess, for example with four such recesses.
  • a blade disc for cutting a material which has on its outer circumference a peripheral edge on the cutting edge.
  • the cutter disk has a center recess for attaching the cutter disk to a driver of a drive shaft rotatable about a rotation axis.
  • a circular saw blade - in particular for cutting concrete - known wherein the saw blade has a number of saw teeth on its outer periphery.
  • the saw blade has a central recess for attaching the saw blade to a driver of a drive shaft rotatable about a rotation axis.
  • the central recess is formed as a cornerless, but not circular - in particular as a plano-convex - center recess, so that the saw blade is fixed in rotation on the drive shaft after mounting on the driver.
  • the prior art knife discs are often made of cemented carbide or ceramic. Both carbide and ceramic are relatively brittle and brittle. In operation, therefore, it often happens that the blade breaks and must be replaced by a new blade.
  • the object of the present invention is to design a cutting disc of the type mentioned in such a way that the risk of breakage is reduced despite a long service life.
  • the center recess of a knife disc of the type mentioned as cornerless, but not circular Mittenaus brieflyung form, so that the blade disc is fixed in rotation on the drive shaft after plugging on the driver.
  • the contour of the central recess is a purely convex curve, for example an ellipse or an oval.
  • the cutting disc made of hard metal and / or ceramic.
  • the central recess is not circular, a distance varies from the boundaries of the central recess opposite the axis of rotation.
  • the maximum distance of such limits is 70% to 80% of an outer diameter of the cutting discs.
  • a minimum distance of such boundaries is preferably 40% to 70% of the outer diameter.
  • the central recess is arranged centrically to the axis of rotation of the drive shaft.
  • the MittenausEnglishung seen in this case in the direction of rotation of the drive shaft on a periodicity is arranged centrically to the axis of rotation of the drive shaft.
  • the central recess is the only recess of the knife disc. This is in particular preferable to manufacture and also reduces the risk of breakage even further.
  • the present invention further relates to a drive shaft for a knife wheel of the type described above, wherein the drive shaft has a driver whose outer contour corresponds to the center recess of the cutter disk.
  • the present invention further relates to a driver for a drive shaft, wherein the driver has a central recess with which the driver can be plugged onto a drive shaft, wherein the driver has an outer contour which corresponds to the center recess of a cutter disk according to the invention.
  • the knife disk 1 is relatively thin in the rule.
  • a thickness d of the cutter disk 1 is usually between 1 millimeter and 4 millimeters, often less than 2.5 millimeters.
  • the cutter disk 1 is generally circular on its outer circumference 3.
  • An outer diameter D of the cutter disk 1 is generally well above 10 cm, for example 20 cm to 35 cm.
  • the cutter disk 1 has on its outer circumference 3 a cutting edge 4 which rotates along the outer circumference 3.
  • the cutting edge 4 can - see FIG. 3 - Be designed as a V-shaped cutting edge 4.
  • the cutting edge 4 - see FIG. 4 - have a steep desk shape.
  • the knife disc 1 has a central recess 5. Due to the presence of the central recess 5, the knife disc 1 can be plugged onto a drive shaft 6. It is placed there on a driver 7 of the drive shaft 6. About the driver 7, the cutter disk 1 is rotatable about a rotation axis 8 of the drive shaft 6.
  • the central recess 5 is - see in particular FIG. 2 - Although designed as a "round”, ie cornerless center recess 5. But it is not designed as a circular Mittenausnaturalung 5. It is therefore fixed in rotation on the drive shaft 6 after plugging on the driver 7, even if it still has to be secured axially.
  • the central recess 5 is in the prior art - see purely by way of example FIG. 5 - Convex-convex.
  • the outer contour of the central recess 5 consists of 4 convex semicircles, which merge into each other via 4 concave quadrants.
  • the radii r of the semicircles are equal to each other.
  • the radii r 'of the quarter circles are equal to each other.
  • radii of semicircles are equal to radii of quarter circles.
  • the - in the present case common - radius r, r 'of the half and quarter circles is preferably about 1/8 of the diameter D of the cutter disk. 1
  • the outer contour of the central recess 5 is formed as a plano-convex curve, ie as a curve consisting of straight sections, which merge into one another via convex sections.
  • Figure 6 shows an example of such a configuration.
  • the radius r "of the quadrants is preferably the same for all quadrants, for example, it may be about 1/8 of the outer diameter D of the cutter disk 1.
  • The" midpoints "9 of the quarter circles may, for example, have a distance a from the axis of rotation 8 which is approximately is equal to half the outer diameter D of the cutter disk 1.
  • the center recess 5 - see FIG. 2 - a pure (ie everywhere) convex curve.
  • the central recess 5 as shown by FIG. 2 be designed as an ellipse.
  • an oval shape is possible.
  • FIG. 2 is the length of a long half-axis 10 of the ellipse, for example, about 3/8 of the outer diameter D of the cutter disk 1.
  • a length of a short half-axis 11 of the ellipse is in the embodiment of FIG. 2 at about 1/4 of the outer diameter D of the knife disc. 1
  • the size of the central recess 5 can be determined as needed. Preferably lies - see FIG. 2 - A maximum distance from boundaries of the central recess 5, which are opposite to each other with respect to the axis of rotation 8, between 70% to 80% of the outer diameter D of the cutter disc 1. Further lies - see again FIG. 2 - A minimum distance from boundaries of the central recess 5, which are opposite to each other with respect to the axis of rotation 8, between 40% and 70% of the outer diameter D of the cutter disk. 1
  • the maximum distance is about 75% of the outer diameter D of the cutter disk 1.
  • the minimum distance is about 50% for the design of FIG. 2 ,
  • the central recess 5 is preferably arranged centrically to the axis of rotation 8 of the drive shaft 6. Furthermore, the central recess 5 seen in the direction of rotation of the drive shaft 6 preferably has a periodicity. It is therefore possible to remove the cutter disk 1 from the driver 7, then to rotate it about 360 ° / n about the axis of rotation 8 and then put it back on the driver 7. In the embodiment of FIG. 2 For example, the value n has the value 2. However, depending on the design of the central recess 5, other values are also possible, for example 3, 5 and 6.
  • the central recess 5 is indeed cornerless, but not circular, is - a correspondingly corresponding configuration of the driver 7 provided already realized by attaching the blade disc 1 on the driver 7 a rotationally fixed fixation of the blade disc 1 on the drive shaft 6 , Further recesses for driving pins and the like are therefore not required. Rather, it is possible that the central recess 5 is the only recess of the knife disc.
  • the material of the blade disc 1 can be selected as needed.
  • the material of the knife disc can be a leash ceramic. Alternatively, it may be a hard metal.
  • the driver 7 of the drive shaft 6 must, as already mentioned, have an outer contour which corresponds to the central recess 5 of the cutter disk 1. It is possible that the driver 7 is part of the drive shaft 6, with the drive shaft 6 is thus integrally connected. Alternatively, it may be at the driver 7 is an independent element which is detachably connected to the drive shaft 6. Such a driver 7 is in the FIGS. 7 and 8th shown. In this case, the driver 7 - in addition to its outer contour; this is formed as already described - in turn, also a central recess 12.
  • the center recess 12 of the driver 7 can in principle have any shape. It may - analogous to the central recess 5 of the blade disc 1, although without corners, but not circular.
  • the center recess 12 of the driver 7 may be circular.
  • the center recess 12 of the driver 7 is formed as a square MittenausEnglishung 12, for example as a square or hexagonal MittenausANSung 12, so that the driver 7 is already held against rotation by plugging onto the drive shaft 5, even if it still has to be fixed axially.
  • the present invention has many advantages. So it is particularly easy to implement. It may even be possible to rework a center recess of a prior art knife disk so that it is designed according to the invention after finishing. The risk of breakage of a cutting disc 1 according to the invention is considerably reduced compared with cutting discs of the prior art. Also, relatively little material is needed for the cutter disk 1 according to the invention. This is particularly important because, for example, carbide is relatively expensive.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Description

Die vorliegende Erfindung betrifft eine Messerscheibe zum Zerschneiden eines Materials,

  • wobei die Messerscheibe an ihrem Außenumfang eine am Außenumfang umlaufende Schneidkante aufweist,
  • wobei die Messerscheibe eine Mittenausnehmung zum Aufstecken der Messerscheibe auf einen Mitnehmer einer um eine Rotationsachse rotierbaren Antriebswelle aufweist.
The present invention relates to a cutting disc for cutting a material,
  • wherein the blade disc has on its outer circumference a peripheral edge on the cutting edge,
  • wherein the cutter disc has a central recess for attaching the cutter disc to a driver of a drive shaft rotatable about a rotation axis.

Derartige Messerscheiben sind in vielfältiger Form bekannt, wobei die Messerscheiben sich, in der Draufsicht gesehen, im Wesentlichen durch ihren Durchmesser, die Form der Mittenausnehmung und das eventuelle Vorhandensein weiterer Ausnehmungen unterscheiden.Such cutting discs are known in many forms, the cutting discs, seen in plan view, differ essentially by their diameter, the shape of the central recess and the possible presence of further recesses.

So ist beispielsweise bekannt, die Mittenausnehmung als kreisrunde Ausnehmung auszugestalten. Die Mittenausnehmung kann - je nach Ausgestaltung - relativ klein oder relativ groß sein. Eine rein kreisförmige Mittenausnehmung ermöglicht jedoch keine drehfeste Verbindung zur Antriebswelle. Daher sind bei den Messerscheiben des Standes der Technik zusätzliche Maßnahmen getroffen, um das Drehmoment von der Antriebswelle auf die Messerscheibe übertragen zu können. So ist beispielsweise bekannt, in den verbleibenden Kreisring zwischen der Mittenausnehmung und dem Außenumfang der Messerscheibe eine Anzahl kreisrunder Bohrungen oder andersartige Ausnehmungen einzubringen, so dass Mitnehmerstifte oder dergleichen in die Bohrungen bzw. Ausnehmungen eingreifen können. Die Anzahl an weiteren Bohrungen bzw. Ausnehmungen variiert. In Einzelfällen ist nur eine einzige derartige Ausnehmung bzw. Bohrung vorhanden. In anderen Fällen beträgt die Anzahl an Bohrungen bzw. Ausnehmungen zwei. Auch mehr als zwei derartige Bohrungen bzw. Ausnehmungen sind bekannt. Teilweise sind bis zu sechs derartige Ausnehmungen bzw. Bohrungen vorhanden.For example, it is known to design the central recess as a circular recess. The central recess can - depending on the configuration - be relatively small or relatively large. However, a purely circular Mittenausnehmung does not allow a rotationally fixed connection to the drive shaft. Therefore, additional measures have been taken in the prior art cutting wheels to transfer the torque from the drive shaft to the cutter disk. For example, it is known to introduce a number of circular bores or other recesses into the remaining circular ring between the central recess and the outer circumference of the knife disk, so that driving pins or the like can engage in the bores or recesses. The number of further holes or recesses varies. In some cases, only a single such recess or hole is present. In other cases, the number of holes or recesses is two. Also more than two such Holes or recesses are known. Sometimes, up to six such recesses or holes are present.

Es ist weiterhin bekannt, die Mittenausnehmung zwar im Wesentlichen kreisförmig zu gestalten, wobei jedoch, ausgehend von der an sich kreisrunden Ausnehmung, mindestens eine nach radial außen zeigende U-förmige Ausnehmung angeordnet ist. Die Anzahl an U-förmigen Ausnehmungen variiert wieder. Minimal ist eine einzige derartige Ausnehmung vorhanden. Es sind auch Ausgestaltungen mit mehr als einer derartigen U-förmigen Ausnehmung vorhanden, beispielsweise mit vier derartigen Ausnehmungen.Although it is also known to make the central recess substantially circular, but, starting from the per se circular recess, at least one radially outwardly facing U-shaped recess is arranged. The number of U-shaped recesses varies again. Minimal, a single such recess is present. There are also embodiments with more than one such U-shaped recess, for example with four such recesses.

Aus der GB 2 050 911 A ist eine Messerscheibe zum Zerschneiden eines Materials bekannt, die an ihrem Außenumfang eine am Außenumfang umlaufende Schneidkante aufweist. Die Messerscheibe weist eine Mittenausnehmung zum Aufstecken der Messerscheibe auf einen Mitnehmer einer um eine Rotationsachse rotierbaren Antriebswelle auf.From the GB 2 050 911 A a blade disc for cutting a material is known, which has on its outer circumference a peripheral edge on the cutting edge. The cutter disk has a center recess for attaching the cutter disk to a driver of a drive shaft rotatable about a rotation axis.

Aus der US 5,303,688 A ist ein Kreissägenblatt - insbesondere zum Schneiden von Beton - bekannt, wobei das Sägeblatt an seinem Außenumfang eine Anzahl von Sägezähnen aufweist. Das Sägeblatt weist eine Mittenausnehmung zum Aufstecken des Sägeblattes auf einen Mitnehmer einer um eine Rotationsachse rotierbaren Antriebswelle auf. Die Mittenausnehmung ist als eckenlose, aber nicht kreisrunde - insbesondere als plano-konvexe - Mittenausnehmung ausgebildet, so dass das Sägeblatt nach dem Aufstecken auf den Mitnehmer drehfest auf der Antriebswelle fixiert ist.From the US 5,303,688 A is a circular saw blade - in particular for cutting concrete - known, wherein the saw blade has a number of saw teeth on its outer periphery. The saw blade has a central recess for attaching the saw blade to a driver of a drive shaft rotatable about a rotation axis. The central recess is formed as a cornerless, but not circular - in particular as a plano-convex - center recess, so that the saw blade is fixed in rotation on the drive shaft after mounting on the driver.

Aus der DE 10 2004 056 642 A1 sind einstellbare Profilkonturen mit mehreren Exzentrizitäten für formschlüssige Welle-Nabe-Verbindungen bekannt. Die Profilkonturen sind konvexkonkav ausgebildet, so dass sie wellenartig um einen mittleren Radius oszillieren.From the DE 10 2004 056 642 A1 are adjustable profile contours with multiple eccentricities for positive shaft-hub connections known. The profile contours are konvexkonkav formed so that they oscillate wave-like around a medium radius.

Die Messerscheiben des Standes der Technik bestehen oftmals aus Hartmetall oder aus Keramik. Sowohl Hartmetall als auch Keramik sind relativ spröde und brüchig. Im Betrieb geschieht es daher relativ oft, dass die Messerscheibe bricht und durch eine neue Messerscheibe ersetzt werden muss.The prior art knife discs are often made of cemented carbide or ceramic. Both carbide and ceramic are relatively brittle and brittle. In operation, therefore, it often happens that the blade breaks and must be replaced by a new blade.

Die Aufgabe der vorliegenden Erfindung besteht darin, eine Messerscheibe der eingangs genannten Art derart auszugestalten, dass trotz langer Standzeit die Bruchgefahr verringert ist.The object of the present invention is to design a cutting disc of the type mentioned in such a way that the risk of breakage is reduced despite a long service life.

Die Aufgabe wird durch eine Messerscheibe zum Zerschneiden eines Materials gelöst, welche die Merkmale des Anspruchs 1 aufweist. Vorteilhafte Ausgestaltungen der erfindungsgemäßen Messerscheibe sind Gegenstand der abhängigen Ansprüche 2 bis 7.The object is achieved by a cutting disc for cutting a material having the features of claim 1. Advantageous embodiments of the cutting disc according to the invention are the subject of the dependent claims 2 to 7.

Erfindungsgemäß ist vorgesehen, die Mittenausnehmung einer Messerscheibe der eingangs genannten Art als eckenlose, aber nicht kreisrunde Mittenausnehmung auszubilden, so dass die Messerscheibe nach dem Aufstecken auf den Mitnehmer drehfest auf der Antriebswelle fixiert ist. Weiterhin ist die Kontur der Mittenausnehmung eine rein konvexe Kurve, beispielsweise eine Ellipse oder ein Oval. Weiterhin besteht die Messerscheibe aus Hartmetall und/oder aus Keramik.According to the invention, the center recess of a knife disc of the type mentioned as cornerless, but not circular Mittenausnehmung form, so that the blade disc is fixed in rotation on the drive shaft after plugging on the driver. Furthermore, the contour of the central recess is a purely convex curve, for example an ellipse or an oval. Furthermore, the cutting disc made of hard metal and / or ceramic.

Auf Grund des Umstands, dass die Mittenausnehmung nicht kreisrund ist, variiert ein Abstand von bezüglich der Rotationsachse gegenüberliegenden Grenzen der Mittenausnehmung. Vorzugsweise beträgt der maximale Abstand derartiger Grenzen 70 % bis 80 % eines Außendurchmessers der Messerscheiben. Weiterhin beträgt ein minimaler Abstand derartiger Grenzen vorzugsweise 40 % bis 70 % des Außendurchmessers.Due to the fact that the central recess is not circular, a distance varies from the boundaries of the central recess opposite the axis of rotation. Preferably, the maximum distance of such limits is 70% to 80% of an outer diameter of the cutting discs. Furthermore, a minimum distance of such boundaries is preferably 40% to 70% of the outer diameter.

In der Regel ist die Mittenausnehmung zentrisch zur Rotationsachse der Antriebswelle angeordnet. Vorzugsweise weist die Mittenausnehmung in diesem Fall in Drehrichtung der Antriebswelle gesehen eine Periodizität auf.As a rule, the central recess is arranged centrically to the axis of rotation of the drive shaft. Preferably, the Mittenausnehmung seen in this case in the direction of rotation of the drive shaft on a periodicity.

Vorzugsweise ist die Mittenausnehmung die einzige Ausnehmung der Messerscheibe. Dies ist insbesondere herstellungstechnisch zu bevorzugen und verringert darüber hinaus die Bruchgefahr noch weiter.Preferably, the central recess is the only recess of the knife disc. This is in particular preferable to manufacture and also reduces the risk of breakage even further.

Die vorliegende Erfindung betrifft weiterhin eine Antriebswelle für eine Messerscheibe der obenstehend beschriebenen Art, wobei die Antriebswelle einen Mitnehmer aufweist, dessen Außenkontur mit der Mittenausnehmung der Messerscheibe korrespondiert.The present invention further relates to a drive shaft for a knife wheel of the type described above, wherein the drive shaft has a driver whose outer contour corresponds to the center recess of the cutter disk.

Die vorliegende Erfindung betrifft weiterhin einen Mitnehmer für eine Antriebswelle, wobei der Mitnehmer eine Mittenausnehmung aufweist, mit welcher der Mitnehmer auf eine Antriebswelle aufsteckbar ist, wobei der Mitnehmer eine Außenkontur aufweist, die mit der Mittenausnehmung einer erfindungsgemäßen Messerscheibe korrespondiert.The present invention further relates to a driver for a drive shaft, wherein the driver has a central recess with which the driver can be plugged onto a drive shaft, wherein the driver has an outer contour which corresponds to the center recess of a cutter disk according to the invention.

Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen in Verbindung mit den Zeichnungen. Es zeigen in Prinzipdarstellung

Figur 1
eine Messerscheibe und eine Antriebswelle in der Seitenansicht,
Figur 2
die Messerscheibe von Figur 1 in der Draufsicht,
Figuren 3 und 4
mögliche Ausgestaltungen einer Schneidkante,
Figuren 5 und 6
Ausgestaltungen von Messerscheiben des Standes der Technik in der Draufsicht,
Figur 7
einen Mitnehmer nebst Antriebswelle im Querschnitt und
Figur 8
den Mitnehmer von Figur 7 in der Draufsicht.
Further advantages and details will become apparent from the following description of exemplary embodiments in conjunction with the drawings. It show in a schematic representation
FIG. 1
a knife disc and a drive shaft in the side view,
FIG. 2
the cutting disc of FIG. 1 in the plan view,
FIGS. 3 and 4
possible embodiments of a cutting edge,
FIGS. 5 and 6
Embodiments of prior art knife discs in plan view,
FIG. 7
a driver along with drive shaft in cross section and
FIG. 8
the driver of FIG. 7 in the plan view.

In den Figuren 1 und 2 ist eine Messerscheibe 1 zum Zerschneiden eines Materials 2 - beispielsweise Papier, Karton oder Blech - dargestellt. Die Messerscheibe 1 ist in der Re-gel relativ dünn. Eine Dicke d der Messerscheibe 1 liegt meist zwischen 1 Millimeter und 4 Millimeter, oftmals unter 2,5 Millimeter. Die Messerscheibe 1 ist in der Regel an ihrem Außenumfang 3 kreisrund. Ein Außendurchmesser D der Messerscheibe 1 liegt in der Regel deutlich oberhalb von 10 cm, beispielsweise bei 20 cm bis 35 cm.In the Figures 1 and 2 is a blade 1 for cutting a material 2 - for example, paper, cardboard or sheet - shown. The knife disk 1 is relatively thin in the rule. A thickness d of the cutter disk 1 is usually between 1 millimeter and 4 millimeters, often less than 2.5 millimeters. The cutter disk 1 is generally circular on its outer circumference 3. An outer diameter D of the cutter disk 1 is generally well above 10 cm, for example 20 cm to 35 cm.

Die Messerscheibe 1 weist an ihrem Außenumfang 3 eine Schneidkante 4 auf, die entlang des Außenumfangs 3 umläuft. Die Schneidkante 4 kann - siehe Figur 3 - als V-förmige Schneidkante 4 ausgebildet sein. Alternativ kann die Schneidkante 4 - siehe Figur 4 - eine steile Pultform aufweisen.The cutter disk 1 has on its outer circumference 3 a cutting edge 4 which rotates along the outer circumference 3. The cutting edge 4 can - see FIG. 3 - Be designed as a V-shaped cutting edge 4. Alternatively, the cutting edge 4 - see FIG. 4 - have a steep desk shape.

Die Messerscheibe 1 weist eine Mittenausnehmung 5 auf. Auf Grund des Vorhandenseins der Mittenausnehmung 5 ist die Messerscheibe 1 auf eine Antriebswelle 6 aufsteckbar. Sie ist dort auf einen Mitnehmer 7 der Antriebswelle 6 aufgesetzt. Über den Mitnehmer 7 ist die Messerscheibe 1 um eine Rotationsachse 8 der Antriebswelle 6 rotierbar.The knife disc 1 has a central recess 5. Due to the presence of the central recess 5, the knife disc 1 can be plugged onto a drive shaft 6. It is placed there on a driver 7 of the drive shaft 6. About the driver 7, the cutter disk 1 is rotatable about a rotation axis 8 of the drive shaft 6.

Die Mittenausnehmung 5 ist - siehe insbesondere Figur 2 - zwar als "runde", also eckenlose Mittenausnehmung 5 ausgebildet. Sie ist aber nicht als kreisrunde Mittenausnehmung 5 ausgebildet. Sie ist daher nach dem Aufstecken auf den Mitnehmer 7 drehfest auf der Antriebswelle 6 fixiert, auch wenn sie noch axial gesichert werden muss.The central recess 5 is - see in particular FIG. 2 - Although designed as a "round", ie cornerless center recess 5. But it is not designed as a circular Mittenausnehmung 5. It is therefore fixed in rotation on the drive shaft 6 after plugging on the driver 7, even if it still has to be secured axially.

Die Mittenausnehmung 5 ist im Stand der Technik - siehe rein beispielhaft Figur 5 - konkav-konvex ausgebildet. In der - rein beispielhaften - Ausgestaltung von Figur 5 besteht die Außenkontur der Mittenausnehmung 5 beispielsweise aus 4 konvexen Halbkreisen, die über 4 konkave Viertelkreise ineinander übergehen. Die Radien r der Halbkreise sind untereinander gleich. Ebenso sind die Radien r' der Viertelkreise untereinander gleich. Gemäß der Ausgestaltung von Figur 5 sind sogar die Radien r der Halbkreise gleich den Radien r' der Viertelkreise. Der - im vorliegenden Fall gemeinsame - Radius r, r' der Halb- und Viertelkreise liegt vorzugsweise bei ca. 1/8 des Durchmessers D der Messerscheibe 1.The central recess 5 is in the prior art - see purely by way of example FIG. 5 - Convex-convex. In the - purely exemplary - embodiment of FIG. 5 For example, the outer contour of the central recess 5 consists of 4 convex semicircles, which merge into each other via 4 concave quadrants. The radii r of the semicircles are equal to each other. Likewise, the radii r 'of the quarter circles are equal to each other. According to the embodiment of FIG. 5 even radii of semicircles are equal to radii of quarter circles. The - in the present case common - radius r, r 'of the half and quarter circles is preferably about 1/8 of the diameter D of the cutter disk. 1

Alternativ ist es im Stand der Technik möglich, dass die Außenkontur der Mittenausnehmung 5 als plano-konvexe Kurve ausgebildet ist, also als Kurve, die aus geraden Abschnitten besteht, die über konvexe Abschnitte ineinander übergehen. Figur 6 zeigt beispielhaft eine derartige Ausgestaltung. Bei der Ausgestaltung von Figur 6 sind vier konvexe Viertelkreise gegeben, die über gerade Abschnitte ineinander übergehen. Der Radius r" der Viertelkreise ist vorzugsweise für alle Viertelkreise derselbe. Er kann beispielsweise ca. 1/8 des Außendurchmessers D der Messerscheibe 1 betragen. Die "Mittelpunkte" 9 der Viertelkreise können beispielsweise einen Abstand a von der Rotationsachse 8 aufweisen, der in etwa gleich der Hälfte des Außendurchmessers D der Messerscheibe 1 ist.Alternatively, it is possible in the prior art that the outer contour of the central recess 5 is formed as a plano-convex curve, ie as a curve consisting of straight sections, which merge into one another via convex sections. Figure 6 shows an example of such a configuration. In the embodiment of FIG. 6 There are four convex quadrilaterals that merge over straight sections. The radius r "of the quadrants is preferably the same for all quadrants, for example, it may be about 1/8 of the outer diameter D of the cutter disk 1. The" midpoints "9 of the quarter circles may, for example, have a distance a from the axis of rotation 8 which is approximately is equal to half the outer diameter D of the cutter disk 1.

Erfindungsgemäß ist die Mittenausnehmung 5 - siehe Figur 2 - eine rein (also überall) konvexe Kurve. Beispielsweise kann die Mittenausnehmung 5 entsprechend der Darstellung von Figur 2 als Ellipse ausgebildet sein. Alternativ ist beispielsweise auch eine ovale Form möglich.According to the invention, the center recess 5 - see FIG. 2 - a pure (ie everywhere) convex curve. For example, the central recess 5 as shown by FIG. 2 be designed as an ellipse. Alternatively, for example, an oval shape is possible.

Bei der - rein beispielhaften - Ausgestaltung von Figur 2 beträgt die Länge einer langen Halbachse 10 der Ellipse beispielsweise ca. 3/8 des Außendurchmessers D der Messerscheibe 1. Eine Länge einer kurzen Halbachse 11 der Ellipse liegt bei der Ausgestaltung von Figur 2 bei ca. 1/4 des Außendurchmessers D der Messerscheibe 1.In the - purely exemplary - embodiment of FIG. 2 is the length of a long half-axis 10 of the ellipse, for example, about 3/8 of the outer diameter D of the cutter disk 1. A length of a short half-axis 11 of the ellipse is in the embodiment of FIG. 2 at about 1/4 of the outer diameter D of the knife disc. 1

Die Größe der Mittenausnehmung 5 kann nach Bedarf bestimmt sein. Vorzugsweise liegt - siehe Figur 2 - ein maximaler Abstand von Grenzen der Mittenausnehmung 5, die bezüglich der Rotationsachse 8 einander gegenüber liegen, zwischen 70 % bis 80 % des Außendurchmessers D der Messerscheibe 1. Weiterhin liegt - siehe erneut Figur 2 - ein minimaler Abstand von Grenzen der Mittenausnehmung 5, die bezüglich der Rotationsachse 8 einander gegenüber liegen, zwischen 40 % und 70 % des Außendurchmessers D der Messerscheibe 1.The size of the central recess 5 can be determined as needed. Preferably lies - see FIG. 2 - A maximum distance from boundaries of the central recess 5, which are opposite to each other with respect to the axis of rotation 8, between 70% to 80% of the outer diameter D of the cutter disc 1. Further lies - see again FIG. 2 - A minimum distance from boundaries of the central recess 5, which are opposite to each other with respect to the axis of rotation 8, between 40% and 70% of the outer diameter D of the cutter disk. 1

Insbesondere mit den - wenn auch nur rein beispielhaften - Ausgestaltungen und Dimensionierungen der Mittenausnehmungen 5 der Figur 2 ergibt sich beispielsweise, dass der maximale Abstand ca. 75 % des Außendurchmessers D der Messerscheibe 1 beträgt. Der minimale Abstand liegt bei ca. 50 % für die Ausgestaltung von Figur 2.In particular, with the - albeit purely exemplary - embodiments and dimensions of the Mittenausnehmungen 5 of FIG. 2 results, for example, that the maximum distance is about 75% of the outer diameter D of the cutter disk 1. The minimum distance is about 50% for the design of FIG. 2 ,

Die Mittenausnehmung 5 ist vorzugsweise zentrisch zur Rotationsachse 8 der Antriebswelle 6 angeordnet. Weiterhin weist die Mittenausnehmung 5 in Drehrichtung der Antriebswelle 6 gesehen vorzugsweise eine Periodizität auf. Es ist also möglich, die Messerscheibe 1 von dem Mitnehmer 7 abzuziehen, sie sodann um 360°/n um die Rotationsachse 8 zu drehen und sie sodann wieder auf den Mitnehmer 7 aufzustecken. Bei der Ausgestaltung von Figur 2 hat der Wert n beispielsweise den Wert 2. Je nach Ausgestaltung der Mittenausnehmung 5 sind jedoch auch andere Werte möglich, beispielsweise 3, 5 und 6.The central recess 5 is preferably arranged centrically to the axis of rotation 8 of the drive shaft 6. Furthermore, the central recess 5 seen in the direction of rotation of the drive shaft 6 preferably has a periodicity. It is therefore possible to remove the cutter disk 1 from the driver 7, then to rotate it about 360 ° / n about the axis of rotation 8 and then put it back on the driver 7. In the embodiment of FIG. 2 For example, the value n has the value 2. However, depending on the design of the central recess 5, other values are also possible, for example 3, 5 and 6.

Auf Grund des Umstands, dass die Mittenausnehmung 5 zwar eckenlos, nicht aber kreisrund ist, ist - eine entsprechend korrespondierende Ausgestaltung des Mitnehmers 7 vorausgesetzt - bereits durch das Aufstecken der Messerscheibe 1 auf den Mitnehmer 7 eine drehfeste Fixierung der Messerscheibe 1 auf der Antriebswelle 6 realisiert. Weitere Ausnehmungen für Mitnehmerstifte und dergleichen sind daher nicht erforderlich. Vielmehr ist es möglich, dass die Mittenausnehmung 5 die einzige Ausnehmung der Messerscheibe ist.Due to the fact that the central recess 5 is indeed cornerless, but not circular, is - a correspondingly corresponding configuration of the driver 7 provided already realized by attaching the blade disc 1 on the driver 7 a rotationally fixed fixation of the blade disc 1 on the drive shaft 6 , Further recesses for driving pins and the like are therefore not required. Rather, it is possible that the central recess 5 is the only recess of the knife disc.

Das Material der Messerscheibe 1 kann nach Bedarf gewählt werden. Beispielsweise kann das Material der Messerscheibe leine Keramik sein. Alternativ kann es sich um ein Hartmetall handeln.The material of the blade disc 1 can be selected as needed. For example, the material of the knife disc can be a leash ceramic. Alternatively, it may be a hard metal.

Der Mitnehmer 7 der Antriebswelle 6 muss, wie bereits erwähnt, eine Außenkontur aufweisen, die mit der Mittenausnehmung 5 der Messerscheibe 1 korrespondiert. Es ist möglich, dass der Mitnehmer 7 Bestandteil der Antriebswelle 6 ist, mit der Antriebswelle 6 also einstückig verbunden ist. Alternativ kann es sich bei dem Mitnehmer 7 um ein eigenständiges Element handeln, das mit der Antriebswelle 6 lösbar verbunden ist. Ein derartiger Mitnehmer 7 ist in den Figuren 7 und 8 dargestellt. In diesem Fall weist der Mitnehmer 7 - zusätzlich zu seiner Außenkontur; diese ist wie bereits beschrieben ausgebildet - seinerseits ebenfalls eine Mittenausnehmung 12 auf. Die Mittenausnehmung 12 des Mitnehmers 7 kann prinzipiell eine beliebige Form aufweisen. Sie kann - analog zur Mittenausnehmung 5 der Messerscheibe 1 zwar eckenlos, aber nicht kreisförmig ausgebildet sein. Alternativ kann die Mittenausnehmung 12 des Mitnehmers 7 kreisrund sein. Vorzugsweise jedoch ist die Mittenausnehmung 12 des Mitnehmers 7 als eckige Mittenausnehmung 12 ausgebildet, beispielsweise als viereckige oder als sechseckige Mittenausnehmung 12, so dass der Mitnehmer 7 durch Aufstecken auf die Antriebswelle 5 bereits drehfest gehalten ist, auch wenn er noch axial fixiert werden muss.The driver 7 of the drive shaft 6 must, as already mentioned, have an outer contour which corresponds to the central recess 5 of the cutter disk 1. It is possible that the driver 7 is part of the drive shaft 6, with the drive shaft 6 is thus integrally connected. Alternatively, it may be at the driver 7 is an independent element which is detachably connected to the drive shaft 6. Such a driver 7 is in the FIGS. 7 and 8th shown. In this case, the driver 7 - in addition to its outer contour; this is formed as already described - in turn, also a central recess 12. The center recess 12 of the driver 7 can in principle have any shape. It may - analogous to the central recess 5 of the blade disc 1, although without corners, but not circular. Alternatively, the center recess 12 of the driver 7 may be circular. Preferably, however, the center recess 12 of the driver 7 is formed as a square Mittenausnehmung 12, for example as a square or hexagonal Mittenausnehmung 12, so that the driver 7 is already held against rotation by plugging onto the drive shaft 5, even if it still has to be fixed axially.

Die vorliegende Erfindung weist viele Vorteile auf. So ist sie insbesondere leicht zu realisieren. Eventuell ist es sogar möglich, eine Mittenausnehmung einer Messerscheibe des Standes der Technik nachzubearbeiten, so dass sie nach der Nachbearbeitung erfindungsgemäß ausgebildet ist. Die Bruchgefahr einer erfindungsgemäßen Messerscheibe 1 ist gegenüber Messerscheiben des Standes der Technik erheblich reduziert. Auch wird für die erfindungsgemäße Messerscheibe 1 relativ wenig Material benötigt. Dies ist insbesondere deshalb von Bedeutung, weil beispielsweise Hartmetall relativ teuer ist.The present invention has many advantages. So it is particularly easy to implement. It may even be possible to rework a center recess of a prior art knife disk so that it is designed according to the invention after finishing. The risk of breakage of a cutting disc 1 according to the invention is considerably reduced compared with cutting discs of the prior art. Also, relatively little material is needed for the cutter disk 1 according to the invention. This is particularly important because, for example, carbide is relatively expensive.

Die obige Beschreibung dient ausschließlich der Erläuterung der vorliegenden Erfindung. Der Schutzumfang der vorliegenden Erfindung soll hingegen ausschließlich durch die beigefügten Ansprüche bestimmt sein.The above description is only for explanation of the present invention. The scope of the present invention, however, is intended to be determined solely by the appended claims.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Messerscheibediameter disc
22
Materialmaterial
33
Außenumfangouter periphery
44
Schneidkantecutting edge
5, 125, 12
MittenausnehmungenMittenausnehmungen
66
Antriebswelledrive shaft
77
Mitnehmertakeaway
88th
Rotationsachseaxis of rotation
99
Mittelpunktemidpoints
10, 1110, 11
Halbachsensemiaxes
aa
Abstanddistance
dd
Dickethickness
DD
Durchmesserdiameter
r, r', r"r, r ', r "
Radienradii

Claims (9)

  1. Knife disc for cutting up a material (2),
    - wherein the knife disc has its outer circumference (3) a cutting edge (4) encircling at the outer circumference (3),
    - wherein the knife disc has a centre recess 95) for plugging the knife disc onto an entrainer (7) of a drive shaft (6) rotatable about an axis (8) of rotation, and
    - wherein the centre recess (5) is formed as a corner-less, but not circularly round, centre recess (5) so that the knife disc after the plugging onto the entrainer (7) is fixed on the drive shaft (6) to be secure against rotation relative thereto,
    characterised in that
    - the centre recess (5) is a purely convex curve and
    - the knife disc consists of hard metal and/or of ceramic.
  2. Knife disc according to claim 1, characterised in that the centre recess (5) is formed as an ellipse or an oval.
  3. Knife disc according to claim 1 or 2, characterised in that a maximum spacing of boundaries, which are opposite with respect to the axis (8) of rotation, of the centre recess (5) is 70% to 80% of an outer diameter (D) of the knife disc.
  4. Knife disc according to any one of the preceding claims, characterised in that a minimum spacing of opposite boundaries of the centre recess (5) is 40% to 70% of an outer diameter (D) of the knife disc.
  5. Knife disc according to any one of the preceding claims, characterised in that the centre recess (5) is arranged centrally with respect to the axis (8) of rotation of the drive shaft (6).
  6. Knife disc according to claim 5, characterised in that the centre recess (5) has a periodicity as seen in the rotational direction of the drive shaft (6).
  7. Knife disc according to any one of the preceding claims, characterised in that the centre recess (5) is the sole recess of the knife disc.
  8. Drive shaft for a knife disc (1) according to any one of the preceding claims, wherein the drive shaft has an entrainer (7), the outer contour of which corresponds with the centre recess (5) of the knife disc (1).
  9. Entrainer for a drive shaft (6), wherein the entrainer has a centre recess (12) by which the entrainer can be plugged onto a drive shaft (6), wherein the entrainer has an outer contour which corresponds with the centre recess (5) of a knife disc (1) according to any one of claims 1 to 7.
EP11178248.8A 2010-08-23 2011-08-22 Cutting blade with cornerless non-circular central recess Not-in-force EP2422941B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11178248T PL2422941T3 (en) 2010-08-23 2011-08-22 Cutting blade with cornerless non-circular central recess

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010037109A DE102010037109A1 (en) 2010-08-23 2010-08-23 Knife disk for cutting a material

Publications (2)

Publication Number Publication Date
EP2422941A1 EP2422941A1 (en) 2012-02-29
EP2422941B1 true EP2422941B1 (en) 2016-01-13

Family

ID=44720582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11178248.8A Not-in-force EP2422941B1 (en) 2010-08-23 2011-08-22 Cutting blade with cornerless non-circular central recess

Country Status (3)

Country Link
EP (1) EP2422941B1 (en)
DE (1) DE102010037109A1 (en)
PL (1) PL2422941T3 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2920610C2 (en) * 1979-05-22 1984-07-05 Jagenberg-Werke AG, 4000 Düsseldorf Rotating disk knife
US5303688A (en) * 1992-04-03 1994-04-19 Chiuminatta Edward R Mounting arbor for saw cutting blades
DE102004056642A1 (en) * 2004-11-24 2006-06-01 Ziaei, Masoud, Dr. Profile contour for form-fit shaft-hub-connection, has geometry that represents non-circular inner and/or outer contours for technical application, where contour possesses mathematical stability different from usual profiles

Also Published As

Publication number Publication date
EP2422941A1 (en) 2012-02-29
PL2422941T3 (en) 2016-07-29
DE102010037109A1 (en) 2012-02-23

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