EP2319669B1 - Debarking knife for the tangential removal of bark from a tree trunk - Google Patents

Debarking knife for the tangential removal of bark from a tree trunk Download PDF

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Publication number
EP2319669B1
EP2319669B1 EP10013393.3A EP10013393A EP2319669B1 EP 2319669 B1 EP2319669 B1 EP 2319669B1 EP 10013393 A EP10013393 A EP 10013393A EP 2319669 B1 EP2319669 B1 EP 2319669B1
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EP
European Patent Office
Prior art keywords
hard material
debarking
strip
knife
material layer
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EP10013393.3A
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German (de)
French (fr)
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EP2319669A3 (en
EP2319669A2 (en
Inventor
Reinhard Jordan
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Gebr Busatis GmbH
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Gebr Busatis GmbH
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Publication of EP2319669A3 publication Critical patent/EP2319669A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/08—Debarking or removing vestiges of branches from trees or logs; Machines therefor using rotating rings

Definitions

  • the invention relates to a debarking knife according to the preamble of claim 1.
  • a debarking knife according to the preamble of claim 1 is known from US 5896902 known.
  • Object of the present invention is to provide a debarking knife of the type mentioned, which has a relation to the prior art significantly increased life.
  • the surface of the blade facing the surface to be removed in the region of the main body adjacent to the hard material layer is degraded more rapidly than in the area of the hard material layer, resulting in a self-sharpening effect which not only keeps the blade sharp, but even with the time aggressive night.
  • the debarking can therefore be done in comparison to the prior art with constantly low contact pressure and therefore with lower drive power.
  • An inventive knife with the dimensions of previous summer knife can also be used in winter, resulting in the production and storage simplifications and costs can be saved. Tests have shown that with the knives according to the invention at least three to four times longer service lives can be achieved. After 20 weeks of use, the knife is in an ideal condition, so that a service life of more than 20 weeks is to be expected.
  • the width of the strip-shaped hard material layer is at least 4 mm, preferably between 6 and 12 mm.
  • a further strip-shaped layer of hard material is provided on the first surface transversely to the working edge on the rear edge in the conveying direction of the workpiece, which protects the edge of the knife when inserting the workpiece in a device provided with the knife, before the debarking process the arm pressing the knife the device leads in the correct radial position and therefore also subject to heavy wear.
  • the thickness of the or one of the strip-shaped hard material layers is in particular a maximum of 4 mm, preferably between 1.5 and 2.0 mm, in order to avoid too much rounding off in the area of the hard material layer during wear.
  • the or at least one of the strip-shaped hard material layers may be formed by a hard metal strip.
  • the or at least one of the strip-shaped hard material layers can be formed by a matrix with embedded hard material particles.
  • the second surface is advantageously normal to the first surface, which facilitates production.
  • the hard material layer is welded onto the second surface.
  • the barking device shown has a body 1 in which a drum 22 rotates, having a central through opening 2.
  • a drum 22 rotates, having a central through opening 2.
  • Three each before and behind the opening 2 arranged, radially displaceable to the opening 2 conveyor rollers 3 (only the rear conveyor rollers are shown in the figure ), which, as indicated in a roller, are provided with spikes 4 on its surface, carry the tree trunks to be debarked 7 through the opening 2.
  • On the drum 22 are concentric with the opening 2 a plurality of arms 5 pivotally mounted, whose ends in front of the opening 2 protrude and debarking 6 carry. If a tree trunk 7 with.
  • the rear edges 8 of the debarking 6 come into engagement with the end face of the tree trunk 7 and guide the arms 5 to the outside until they rest on the circumference of the log 7.
  • the contact pressure of the debarking 6 on the tree trunk 7 is controlled by the bearings 9 of the arms 5.
  • the cutting edges 21 of the debarking knives 6 aligned parallel to the longitudinal axis of the log 7 are pressed against the outer circumference of the log 7 according to the contact pressure and remove the bark 11 of the log 7 spirally in accordance with the rotation of the drum 22 and the advance of the log 7 in the longitudinal direction.
  • the arms 5 could be mounted with the knives 6 directly on the body 1 and the tree trunk 7 both rotated about its axis and pushed through the opening 2.
  • FIGS. 2 to 5 show a knife 6 according to the invention, as shown in the in Fig. 1 shown device can be inserted into the arms 5.
  • the knife 6 has a first surface 13 and a second surface 14 which together form the working edge 10.
  • At its first surface 13, which faces the bark 11 located on the log 7 in use, the knife 6 has a strip-shaped hard material layer 12 along the rear edge 8 in the conveying direction of the tree trunk 7.
  • This edge 8 which runs to the axis of the tree trunk 7 and in the device Fig. 1 the opening 2 faces, serves, as already to Fig.
  • FIGS. 6 to 9 you can see the tree trunk 7, the bark 11 is already partially removed, and an arm 5, which moves in the direction of the arrow.
  • the mounted on the arms 5 knives (6 according to the invention, 16 according to the prior art) are with their cutting edges 21, 23 with a certain contact pressure on the tree trunk 7, so that upon rotation of the tree trunk. 7, the cutting edge 21, 23, the bark 11 is removed.
  • the knife 6 according to the invention has on its side facing away from the bark 11 second surface 14, the strip-shaped hard material layer 15 with the cutting edge 21 along the working edge 10.
  • the knife 16 of the prior art has on its the bark 11 facing surface 18 on the strip-shaped provided with the cutting edge 23 hard material layer 19, which extends along the working edge 17 of the body.
  • Fig. 9 recognizes that in the knife 16 of the prior art by the wear of the hard material layer 19, the underlying material of the base body 20 has been removed and the radius of the cutting edge 23 has increased significantly, ie the blade 16 has become dull. For the length of the service life is therefore in the prior art knife 16, it is important that the surfaces forming the working edge 17 be at an acute angle. The size of the angle but has stability reasons, a lower limit and the production of the working edge 17 with an acute angle is costly.

Description

Die Erfindung betrifft ein Entrindungsmesser gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a debarking knife according to the preamble of claim 1.

Zur Entrindung von Baumstämmen sind Vorrichtungen bekannt, durch die die Baumstämme hindurchgeführt werden. Dabei ziehen mehrere auf radial angeordneten Armen montierte Entrindungsmesser die Rinde tangential von den Baumstämmen ab. Mit der Zeit wird die Arbeitskante solcher Messer, die gleichzeitig Schneidkante ist, stumpf und das Ergebnis der Entrindung ist nicht mehr zufriedenstellend oder kann nur durch Erhöhen des Anpressdruckes der Arme an den Stamm erreicht werden, was einen erhöhten Leistungsbedarf bedeutet.For debarking of tree trunks devices are known through which the tree trunks are passed. Several barking tools mounted on radially arranged arms pull the bark tangentially away from the tree trunks. Over time, the working edge of such knife, which is also cutting edge, becomes dull and the result of debarking is no longer satisfactory or can only be achieved by increasing the contact pressure of the arms to the trunk, which means an increased power requirement.

Um einem zu raschen Stumpfwerden und einem zu häufigen Messertausch entgegenzuwirken ist es bekannt, die Entrindungsmesser auf der dem Baumstamm zugewandten Seite mit einer streifenförmigen die Schneidkante aufweisenden Hartstoffschicht entlang der Arbeitskante zu versehen, sodass der Bereich der Schneidkante aus einem widerstandsfähigeren Material besteht. Damit können Standzeiten von bis zu 6 Wochen erzielt werden.In order to counteract a too rapid dulling and a too frequent knife exchange, it is known to provide the debarking knife on the side facing the tree trunk with a strip-shaped hard material layer having the cutting edge along the working edge, so that the region of the cutting edge consists of a more resistant material. This allows a service life of up to 6 weeks.

Eine Entrindungsmesser gemäß dem Oberbegriff des Anspruchs 1 ist aus der US 5896902 bekannt.A debarking knife according to the preamble of claim 1 is known from US 5896902 known.

Aufgabe der vorliegenden Erfindung ist es ein Entrindungsmesser der eingangsgenannten Art zu schaffen, das eine gegenüber dem Stand der Technik deutlich erhöhte Standzeit aufweist.Object of the present invention is to provide a debarking knife of the type mentioned, which has a relation to the prior art significantly increased life.

Zur Lösung der Aufgabe ist eine Entrindungsmesser gemäß Anspruch 1 vorgesehen.To solve the problem, a debarking according to claim 1 is provided.

Beim Einsatz des Messers kommt es auf der der zu entfernenden Oberfläche zugewandten Oberfläche des Messers im Bereich des an die Hartstoffschicht angrenzenden Grundkörpers zu einem rascheren Abbau des Materials als im Bereich der Hartstoffschicht, wodurch sich ein Selbstschärfeffekt ergibt, der das Messer nicht nur scharf hält, sondern sogar mit der Zeit agressiver nacht. Das Entrinden kann daher im Vergleich zum Stand der Technik mit andauernd geringem Anpressdruck und daher mit geringerer Antriebsleistung erfolgen. Auch müssen nicht wie bisher verschiedene Messer für den Sommerbetrieb und den Winterbetrieb verwendet werden. Ein erfindungsgemäßes Messer mit den Dimensionen bisheriger Sommermesser lässt sich auch im Winter einsetzen, wodurch sich bei der Produktion und der Lagerhaltung Vereinfachungen ergeben und Kosten eingespart werden können. Tests haben gezeigt, dass mit den erfindungsgemäßen Messern mindestens drei- bis vierfach verlängerte Standzeiten erreicht werden können. Nach 20 Wochen Einsatz ist das Messer in einem idealen Zustand, sodass eine Standzeit weit über 20 Wochen zu erwarten ist.When the blade is used, the surface of the blade facing the surface to be removed in the region of the main body adjacent to the hard material layer is degraded more rapidly than in the area of the hard material layer, resulting in a self-sharpening effect which not only keeps the blade sharp, but even with the time aggressive night. The debarking can therefore be done in comparison to the prior art with constantly low contact pressure and therefore with lower drive power. Also do not have to be used as before various knives for summer operation and winter operation. An inventive knife with the dimensions of previous summer knife can also be used in winter, resulting in the production and storage simplifications and costs can be saved. Tests have shown that with the knives according to the invention at least three to four times longer service lives can be achieved. After 20 weeks of use, the knife is in an ideal condition, so that a service life of more than 20 weeks is to be expected.

Gemäß einer bevorzugten Ausführungsform beträgt die Breite der streifenförmigen Hartstoffschicht mindestens 4mm, vorzugsweise zwischen 6 und 12 mm.According to a preferred embodiment, the width of the strip-shaped hard material layer is at least 4 mm, preferably between 6 and 12 mm.

Vorteilhafterweise ist auf der ersten Oberfläche quer zur Arbeitskante an der in Förderrichtung des Werkstücks hinteren Kante eine weitere streifenförmige Hartstoffschicht vorgesehen, die beim Einbringen des Werkstückes in eine mit dem Messer versehene Vorrichtung jene Kante des Messers schützt, die vor dem Entrindungsvorgang den das Messer andrückenden Arm der Vorrichtung in die richtige radiale Position führt und daher auch einer starken Abnützung unterliegt.Advantageously, a further strip-shaped layer of hard material is provided on the first surface transversely to the working edge on the rear edge in the conveying direction of the workpiece, which protects the edge of the knife when inserting the workpiece in a device provided with the knife, before the debarking process the arm pressing the knife the device leads in the correct radial position and therefore also subject to heavy wear.

Die Dicke der oder einer der streifenförmigen Hartstoffschichten beträgt insbesondere maximal 4 mm vorzugsweise zwischen 1,5 und 2,0 mm, um bei Verschleiß ein zu starkes Abrunden im Bereich der Hartstoffschicht zu vermeiden.The thickness of the or one of the strip-shaped hard material layers is in particular a maximum of 4 mm, preferably between 1.5 and 2.0 mm, in order to avoid too much rounding off in the area of the hard material layer during wear.

Die oder wenigstens eine der streifenförmigen Hartstoffschichten kann durch eine Hartmetallleiste gebildet sein.The or at least one of the strip-shaped hard material layers may be formed by a hard metal strip.

Alternativ kann die oder wenigstens eine der streifenförmigen Hartstoffschichten durch eine Matrix mit eingelagerten Hartstoffpartikeln gebildet werden.Alternatively, the or at least one of the strip-shaped hard material layers can be formed by a matrix with embedded hard material particles.

Die zweite Oberfläche steht vorteilhafter Weise normal auf die erste Oberfläche, was die Produktion erleichtert.The second surface is advantageously normal to the first surface, which facilitates production.

Um besseren Halt zu gewährleisten, ist die Hartstoffschicht auf die zweite Oberfläche aufgeschweißt.To ensure a better grip, the hard material layer is welded onto the second surface.

Im Folgenden soll die Erfindung anhand einer Ausführungsform der Erfindung, nämlich einem Entrindungsmesser, mit Hilfe der beiliegenden Zeichnungen beschrieben werden.

  • Fig. 1 zeigt schematisch eine Entrindungsvorrichtung.
  • Fig. 2 zeigt ein erfindungsgemäßes Entrindungsmesser in einer Draufsicht.
  • Fig. 3 zeigt eine Seitenansicht des Entrindungsmessers gemäß Pfeil III in Fig. 2.
  • Fig. 4 zeigt einen Schnitt durch das Entrindungsmesser aus Fig. 2 entlang der Linie IV-IV.
  • Fig. 5. zeigt eine Ansicht des Entrindungsmessers gemäß dem Pfeil V in Fig. 2.
  • Fig. 6 zeigt ein neues erfindungsgemäße Entrindungsmesser im Einsatz.
  • Fig. 7 zeigt im Vergleich dazu ein noch ungebrauchtes Entrindungsmesser des Standes der Technik im Einsatz.
  • Fig. 8 zeigt das erfindungsgemäße Entrindungsmesser mit Verschleiß durch den Einsatz.
  • Fig. 9 zeigt das Entrindungsmesser des Standes der Technik mit Verschleiß durch den Einsatz.
In the following, the invention will be described with reference to an embodiment of the invention, namely a debarking, with the aid of the accompanying drawings.
  • Fig. 1 shows schematically a debarking device.
  • Fig. 2 shows a debarking knife according to the invention in a plan view.
  • Fig. 3 shows a side view of the debarking knife according to arrow III in Fig. 2 ,
  • Fig. 4 shows a section through the debarking knife Fig. 2 along the line IV-IV.
  • Fig. 5 , shows a view of the debarking according to the arrow V in Fig. 2 ,
  • Fig. 6 shows a new debarking knife according to the invention in use.
  • Fig. 7 shows in comparison to a still unused debarking knife of the prior art in use.
  • Fig. 8 shows the debarking knife according to the invention with wear by the use.
  • Fig. 9 shows the debarking knife of the prior art with wear through the insert.

Die in Fig. 1 gezeigte Entrindungsvorrichtung weist einen Körper 1 auf, in dem sich eine Trommel 22 dreht, die eine zentrale durchgehende Öffnung 2 hat Jeweils drei vor und hinter der Öffnung 2 angeordnete, radial zur Öffnung 2 verschiebbare Förderwalzen 3 (nur die hinteren Förderwalzen sind in der Figur gezeigt), die, wie bei einer Walze angedeutet, mit Stacheln 4 an ihrer Oberfläche versehen sind, befördern die zu entrindenden Baumstämme 7 durch die Öffnung 2. An der Trommel 22 sind konzentrisch zur Öffnung 2 mehrere Arme 5 schwenkbar gelagert, deren Enden vor die Öffnung 2 ragen und Entrindungsmesser 6 tragen. Wird ein Baumstamm 7 mit. Hilfe der hinteren Förderwalzen 3 durch die Öffnung 2 gegen die Arme 5 geschoben, kommen die hinteren Kanten 8 der Entrindungsmesser 6 in Eingriff mit der Stirnfläche des Baumstammes 7 und führen die Arme 5 nach außen, bis sie am Umfang des Baumstammes 7 aufliegen. Der Anpressdruck der Entrindungsmesser 6 auf den Baumstamm 7 wird über die Lager 9 der Arme 5 gesteuert. Die parallel zur Längsachse des Baumstammes 7 ausgerichteten Schneidkanten 21 der Entrindungsmesser 6 werden gemäß dem Anpressdruck an den äußeren Umfang des Baumstammes 7 gepresst und entfernen die Rinde 11 des Baumstammes 7 spiralförmig entsprechend der Rotation der Trommel 22 und des Vorschubs des Baumstammes 7 in Längsrichtung. Alternativ könnten die Arme 5 mit den Messern 6 direkt am Körper 1 gelagert sein und der Baumstamm 7 sowohl um seine Achse gedreht als auch durch die Öffnung 2 geschoben werden.In the Fig. 1 The barking device shown has a body 1 in which a drum 22 rotates, having a central through opening 2. Three each before and behind the opening 2 arranged, radially displaceable to the opening 2 conveyor rollers 3 (only the rear conveyor rollers are shown in the figure ), which, as indicated in a roller, are provided with spikes 4 on its surface, carry the tree trunks to be debarked 7 through the opening 2. On the drum 22 are concentric with the opening 2 a plurality of arms 5 pivotally mounted, whose ends in front of the opening 2 protrude and debarking 6 carry. If a tree trunk 7 with. Help the rear conveyor rollers 3 pushed through the opening 2 against the arms 5, the rear edges 8 of the debarking 6 come into engagement with the end face of the tree trunk 7 and guide the arms 5 to the outside until they rest on the circumference of the log 7. The contact pressure of the debarking 6 on the tree trunk 7 is controlled by the bearings 9 of the arms 5. The cutting edges 21 of the debarking knives 6 aligned parallel to the longitudinal axis of the log 7 are pressed against the outer circumference of the log 7 according to the contact pressure and remove the bark 11 of the log 7 spirally in accordance with the rotation of the drum 22 and the advance of the log 7 in the longitudinal direction. Alternatively, the arms 5 could be mounted with the knives 6 directly on the body 1 and the tree trunk 7 both rotated about its axis and pushed through the opening 2.

Die Figuren 2 bis 5 zeigen ein erfindungsgemäßes Messer 6, wie es in der in Fig. 1 gezeigten Vorrichtung in die Arme 5 eingesetzt werden kann. Das Messer 6 hat eine erste Oberfläche 13 und eine zweite Oberfläche 14, die miteinander die Arbeitskante 10 bilden. Auf der zweiten Oberfläche 14, die im Einsatz von der Rinde 11 des Baumstammes 7 abgewandt ist, ist entlang der Arbeitskante 10 eine streifenförmige Hartstoffschicht 15 mit der Schneidkante 21 vorgesehen. An seiner ersten Oberfläche 13, die im Einsatz der auf dem Baumstamm 7 befindlichen Rinde 11 zugewandt ist, weist das Messer 6 eine streifenförmige Hartstoffschicht 12 entlang der in Förderrichtung des Baumstammes 7 hinteren Kante 8 auf. Diese Kante 8, die que zur Achse des Baumstammes 7 verläuft und in der Vorrichtung aus Fig. 1 der Öffnung 2 zugewandt ist, dient dazu, wie bereits zu Fig. 1 beschrieben, bei Zuführen eines neuen Baumstammes 7 die Arme 5 zum Umfang des Baumstammes 7 zu führen, wonach das Entrinden beginnt. Da auch diese, Kante 8 einer starken Abnutzung unterliegt, ist das Vorsehen einer Hartstoffschicht 12 sinnvoll um dem Messer 6 eine hohe Standzelt zu veneihen. Die Hartstoffschicht 12 verhindert auch die Erosion des Materials des Grundkörpers 20 des Messers 6 unter der Hartstoffschicht 15 und damit ein Brechen derselben. Die Bohrungen 24 dienen zum Befestigen des Messers 6 an einem Arm 5 der Vorrichtung gemäß Fig. 1.The FIGS. 2 to 5 show a knife 6 according to the invention, as shown in the in Fig. 1 shown device can be inserted into the arms 5. The knife 6 has a first surface 13 and a second surface 14 which together form the working edge 10. On the second surface 14, which faces away from the bark 11 of the tree trunk 7 in use, a strip-shaped hard material layer 15 with the cutting edge 21 is provided along the working edge 10. At its first surface 13, which faces the bark 11 located on the log 7 in use, the knife 6 has a strip-shaped hard material layer 12 along the rear edge 8 in the conveying direction of the tree trunk 7. This edge 8, which runs to the axis of the tree trunk 7 and in the device Fig. 1 the opening 2 faces, serves, as already to Fig. 1 described when feeding a new log 7 to guide the arms 5 to the circumference of the tree trunk 7, after which the debarking begins. Since this, edge 8 is subject to heavy wear, the provision of a layer of hard material 12 is useful to the knife 6 a high stand tent to veneer. The hard material layer 12 also prevents the erosion of the material of the base body 20 of the blade 6 under the hard material layer 15 and thus breaking the same. The holes 24 are used to attach the blade 6 to an arm 5 of the device according to Fig. 1 ,

In den Figuren 6 bis 9 sieht man den Baumstamm 7, dessen Rinde 11 bereits teilweise entfernt ist, und einen Arm 5, der sich in Pfeilrichtung bewegt. Die auf den Armen 5 montierten Messer (6 gemäß Erfindung, 16 gemäß Stand der Technik) liegen mit ihren Schneidkanten 21, 23 mit einem gewissen Anpressdruck am Baumstamm 7 an, sodass bei Drehung des Baumstammes. 7 die Schneidkante 21, 23 die Rinde 11 entfernt. Das erfindungsgemäße Messer 6 weist an seiner der Rinde 11 abgewandten zweiten Oberfläche 14 die streifenförmige Hartstoffschicht 15 mit der Schneidkante 21 entlang der Arbeitskante 10 auf. Das Messer 16 des Standes der Technik weist an seiner der Rinde 11 zugewandten Oberfläche 18 die streifenförmige mit der Schneidkante 23 versehene Hartstoffschicht 19 auf, die entlang der Arbeitskante 17 des Grundkörpers verläuft. Durch das Ausbilden der Schneidkanten 21 und 23 in den Hartstoffschichten 15, 19 wird einem zu raschen Stumpfwerden der Messer vorgebeugt.In the FIGS. 6 to 9 you can see the tree trunk 7, the bark 11 is already partially removed, and an arm 5, which moves in the direction of the arrow. The mounted on the arms 5 knives (6 according to the invention, 16 according to the prior art) are with their cutting edges 21, 23 with a certain contact pressure on the tree trunk 7, so that upon rotation of the tree trunk. 7, the cutting edge 21, 23, the bark 11 is removed. The knife 6 according to the invention has on its side facing away from the bark 11 second surface 14, the strip-shaped hard material layer 15 with the cutting edge 21 along the working edge 10. The knife 16 of the prior art has on its the bark 11 facing surface 18 on the strip-shaped provided with the cutting edge 23 hard material layer 19, which extends along the working edge 17 of the body. By forming the cutting edges 21 and 23 in the hard material layers 15, 19, too rapid dulling of the knives is prevented.

Nach mehrwöchigem Einsatz erkennt man an den Messern 6, 16 deutliche Verschleißerscheinungen, wie sie in den Figuren 8 und 9 dargestellt sind. Auch die Hartstoffschichten 15, 19 unterliegen einem Verschleiß. Aber vor Allem das weichere Material der Grundkörper 20 der Messer 6,16 wird abgetragen.After several weeks of use can be seen on the knives 6, 16 significant signs of wear, as in the FIGS. 8 and 9 are shown. The hard material layers 15, 19 are subject to wear. But above all, the softer material of the base body 20 of the knife 6,16 is removed.

In Fig. 9 erkennt man, dass beim Messer 16 des Standes der Technik durch den Verschleiß der Hartstoffschicht 19, das dahinter liegende Material des Grundkörpers 20 abgetragen wurde und der Radius der Schneidkante 23 deutlich zugenommen hat, d.h. das Messer 16 stumpf geworden ist. Für die Länge der Standzeit ist daher beim Messer 16 des Standes der Technik wichtig, dass die die Arbeitskante 17 bildenden Oberflächen einen spitzen Winkel miteinander einschließen. Die Größe des Winkels hat aber aus Stabilitätsgründen einen unteren Grenzwert und die Herstellung der Arbeitskante 17 mit einem spitzen Winkel ist aufwändig.In Fig. 9 recognizes that in the knife 16 of the prior art by the wear of the hard material layer 19, the underlying material of the base body 20 has been removed and the radius of the cutting edge 23 has increased significantly, ie the blade 16 has become dull. For the length of the service life is therefore in the prior art knife 16, it is important that the surfaces forming the working edge 17 be at an acute angle. The size of the angle but has stability reasons, a lower limit and the production of the working edge 17 with an acute angle is costly.

Wie man in Flg. 8 sieht hat beim Messer 6 der vorliegenden Erfindung ebenfalls ein Verschleiß der Hartstoffschicht 15 stattgefunden. Ein weitaus größerer Materialabbau ist aber beim Material des Grundkörpers 20 unterhalb der Hartstoffschicht 15 erfolgt. Durch den Materialabbau des Grundkörpers 20 ergibt sich ein Selbstschärfeffekt, durch den das Messer 6 sogar schärfer Ist, als Im neuen Zustand. Das Abrunden der Schneidkante 21 ist durch die Dicke der Hartstoffschicht 15 beschränkt, die daher nicht größer als 4mm und vorzugsweise zwischen 1,5 und 2 mm betragen soll. Beim Messer 16 des Standes der Technik kann es zwar an der der Rinde 11 zugewandten Oberfläche unterhalb der Hartstoffschicht 19 auch zu einem Abbau des Materials des Grundkörpers 20 kommen, aufgrund der geometrischen Anordnung der Hartstoffschicht 19 ergibt sich jedoch kein Selbstschärfeffekt:How to be in Flg. 8 sees in the knife 6 of the present invention also a wear of the hard material layer 15 has taken place. However, a much greater material degradation is carried out in the material of the base body 20 below the hard material layer 15. Due to the material degradation of the base body 20 results in a self-sharpening effect by which the knife 6 is even sharper than in the new state. The rounding of the cutting edge 21 is limited by the thickness of the hard material layer 15, which should therefore not be greater than 4 mm and preferably between 1.5 and 2 mm. Although in the case of the knife 16 of the state of the art, although the surface of the hard body 19 facing the bark 11 may also be degraded, the material of the body 20 can be degraded, but due to the geometrical arrangement of the hard material layer 19, no self-sharpening effect results:

Claims (8)

  1. Debarking blade (6) for the tangential removal of the bark (11) of a tree trunk (7) having a first surface (13) which during use faces the bark (11) to be removed of the tree trunk (7), and a second surface (14) which during use faces away from the bark (11) to be removed, which forms a finite angle with the first surface (13) and which forms a working edge (10) therewith, wherein at least one strip-shaped hard material layer (15) is provided with a cutting edge (21) on the surface of the debarking blade (6), characterized in that the strip-shaped hard material layer (15) is provided on the second surface (14) along the working edge (10).
  2. Debarking blade according to Claim 1, characterized in that the width of the strip-shaped hard material layer (15) is at least 4 mm, preferably between 6 and 12 mm.
  3. Debarking blade according to Claim 1 or 2, characterized in that a further strip-shaped hard material layer (12) is provided on the first surface (13) transversely to the working edge (10), on the trailing edge (8) in the direction of conveyance of the tree trunk (7).
  4. Debarking blade according to Claim 1, 2 or 3, characterized in that the thickness of the or one of the strip-shaped hard material layers (12, 15) is a maximum of 4 mm, preferably between 1.5 and 2.0 mm.
  5. Debarking blade according to one of the preceding claims, characterized in that the or at least one of the strip-shaped hard material layers (12, 15) is formed by a hard metal strip.
  6. Debarking blade according to one of the preceding claims, characterized in that the or at least one of the strip-shaped hard material layers (12, 15) is formed by a matrix comprising embedded hard material particles.
  7. Debarking blade according to one of the preceding claims, characterized in that the second surface (14) is perpendicular to the first surface (13).
  8. Debarking blade according to one of the preceding claims, characterized in that the hard material layer (15) is welded to the second surface (14).
EP10013393.3A 2009-11-05 2010-10-07 Debarking knife for the tangential removal of bark from a tree trunk Active EP2319669B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0175509A AT508771B1 (en) 2009-11-05 2009-11-05 KNIFE FOR THE TANGENTIAL REMOVAL OF A SURFACE OF A WORKPIECE

Publications (3)

Publication Number Publication Date
EP2319669A2 EP2319669A2 (en) 2011-05-11
EP2319669A3 EP2319669A3 (en) 2013-11-06
EP2319669B1 true EP2319669B1 (en) 2016-05-04

Family

ID=43499885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10013393.3A Active EP2319669B1 (en) 2009-11-05 2010-10-07 Debarking knife for the tangential removal of bark from a tree trunk

Country Status (4)

Country Link
US (1) US20120111452A1 (en)
EP (1) EP2319669B1 (en)
AT (1) AT508771B1 (en)
CA (1) CA2720165C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635271A (en) * 1970-08-26 1972-01-18 Deere & Co Cutterhead and shear bar for forage harvesters
US3805660A (en) * 1973-01-15 1974-04-23 Gehl Co Shear bar for forage harvesters or the like
SE430391B (en) * 1977-11-11 1983-11-14 Jonsson Karl Erik Arnold WORKING BODY IN HALROTOR TYPE BARKING MACHINES
JPS62181836A (en) * 1986-02-03 1987-08-10 Iwane Ishida Manufacturing method for cutting edge formed with ultra-hard film
DE8602803U1 (en) * 1986-02-04 1986-07-17 Veltmann, Bernhard, 49479 Ibbenbüren Garden and culture maintenance device
DE8703479U1 (en) * 1986-12-08 1987-07-23 Veltmann, Bernhard, 4530 Ibbenbueren, De
DE3734781A1 (en) * 1987-10-14 1989-04-27 Knedla Richard Process for producing a layer with sharpening effect on cutting edges of shear blades
SE463660B (en) * 1987-12-01 1991-01-07 Iggesund Tools Ab PROCESSING ORGANIZATION MACHINERY MACHINE MACHINE MACHINERY
FR2750907B1 (en) * 1996-07-12 1998-09-18 Technogenia DEBARKING KNIFE, AND METHOD FOR THE PRODUCTION THEREOF
AT404471B (en) * 1997-04-28 1998-11-25 Busatis Gmbh HARD MATERIAL COATING FOR KNIVES OR CUTTING
AT405475B (en) * 1997-05-16 1999-08-25 Busatis Gmbh CUTTING BAR
US6601621B2 (en) * 2001-04-18 2003-08-05 Black & Decker Inc. Portable Power Planer
WO2005030447A1 (en) * 2003-10-02 2005-04-07 Iggesund Tools Ab Barking device and barking tool
SE526191C2 (en) * 2003-12-19 2005-07-26 Sandvik Ab Egg-provided tools and methods for making them
US7350548B1 (en) * 2006-10-16 2008-04-01 Nicholson Manufacturing Ltd. Swing arm assembly with replaceable insert for use with a debarker apparatus
US7743805B2 (en) * 2007-06-13 2010-06-29 Nicholson Manufacturing Ltd. Debarking tip assembly with replaceable cutting element
US7931055B2 (en) * 2009-02-10 2011-04-26 Reimler James L Log debarking tool and tool tip

Also Published As

Publication number Publication date
AT508771A4 (en) 2011-04-15
CA2720165C (en) 2017-11-21
EP2319669A3 (en) 2013-11-06
AT508771B1 (en) 2011-04-15
CA2720165A1 (en) 2011-05-05
US20120111452A1 (en) 2012-05-10
EP2319669A2 (en) 2011-05-11

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