EP0141831B1 - Plant for bark-peeling tree-trunks or the like - Google Patents

Plant for bark-peeling tree-trunks or the like Download PDF

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Publication number
EP0141831B1
EP0141831B1 EP84901717A EP84901717A EP0141831B1 EP 0141831 B1 EP0141831 B1 EP 0141831B1 EP 84901717 A EP84901717 A EP 84901717A EP 84901717 A EP84901717 A EP 84901717A EP 0141831 B1 EP0141831 B1 EP 0141831B1
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Prior art keywords
tree trunk
tree
bark
knife roller
trunk
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EP84901717A
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German (de)
French (fr)
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EP0141831A1 (en
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Franz Attems
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Individual
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Individual
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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

Definitions

  • the invention relates to an arrangement for debarking tree trunks or the like.
  • a rotating debarking tool which consists of a knife roller provided with peeling knives, which is arranged on a swivel arm against the tree trunk so that the tree trunk to be debarked can be swiveled or pivoted its longitudinal axis can be moved relative to the debarking tool with the help of wheels guided on rails and is rotated about its axis by means of a drive device, and at one end of the log a holding device with the drive device for rotating the log and in the area of the knife roller a support device for the loose support of the tree trunk is provided.
  • peeling knives in single-thread or multi-thread screw lines to the surface of the knife roller in machines for processing tree trunks.
  • peeling strips are arranged on a helical bracket, which are supplemented by knife strips running in the axial direction on the jacket of the roller.
  • the helical peeling knives have a complicated profile, which is composed of radial cutting, a comb surface, a cutting edge and a groove. There, too, the axis of rotation of the knife roller runs axially parallel to the tree trunks to be processed.
  • the peeling knives used are complicated and wear out quickly, so that they have to be reground.
  • the invention has for its object to completely debark even round and crooked long logs, to prevent the peeling knife from biting into the wood and at the same time to ensure that the peeling knife sharpen itself during processing.
  • the arrangement according to the invention is characterized in that the axis of rotation of the knife roller is at an acute angle to the axis of the tree trunk and that the peeling knives consist, in a manner known per se, of flat or vertically applied flat iron in helical lines on the surface of the knife roller, which lie above the roller surface protrude and are concentric with their outside to this.
  • the relatively small swivel movements occurring in the area of the knife roller can be compensated for by the swivel arm without impairing the processing quality, so that a complete debarking of the tree trunk is always guaranteed. This is particularly facilitated by the fact that, in the arrangement according to the invention, the length of the contacting surface lines of knife roller and tree trunk are shortened significantly (theoretically to one point) compared to the known designs.
  • Knots and root run-off can be removed in one step, with the processing intensity and the peeling depth being selected as required by regulating the feed movement and the rotational speed of the tree trunk and the rotational speed of the knife roller. Sensors and supports for adjusting the Peeling depth is not necessary.
  • the bark is pushed away with the back of the knife, so that the peeling knife cannot bite into the wood of the tree trunk and even heavily soiled wood, for example with stones stuck in the bark, can be processed safely.
  • the peeling knives sharpen themselves during processing.
  • the direction of rotation of the knife roller and the processed tree trunk are advantageously opposite to each other.
  • the holding device can be arranged on a drive carriage running on rails, which is provided in the feed direction of the tree trunk to be debarked in front of the knife roller, carries the drive device for rotating the tree trunk and in a known manner with the aid of a feed device against the Knife roller is mobile.
  • this holding device With the help of this holding device, the tree trunk to be processed is only held at one end, rotated about its axis and advanced against the knife roller. At its other end, the tree trunk can move freely so that it can swing out with this end if its axis is curved.
  • the support device can be arranged on a support carriage, which can be locked in the area of the knife roller, and an outlet carriage for receiving the barked end of the tree trunk can be freely displaceably guided on rails in the feed direction of the tree trunk, which preferably has a trough-shaped slide that catches the machined end of the tree trunk.
  • the support device supports the front end of the tree trunk even before processing begins.
  • the support carriage is then carried on the rails to the area of the knife roller with the tree trunk and braked there, whereupon the tree trunk slides over the support carriage. Its barked end is caught by the discharge cart.
  • a simple and expedient embodiment of the support device consists of a carrier with a rounded surface which is arranged transversely to the direction of advance and which is preferably bent downward and forms a sliding guide for the tree trunk.
  • the drive device for rotating the tree trunk consists of a rotating twist drill and a stop surface concentrically surrounding it with projecting prongs.
  • the twist drill which is rotated by the drive device, screws into the end of the tree trunk when it hits the end of the tree trunk until the prongs lie firmly against the tree trunk and take it along. If the drive device is provided with a reverse gear, the finished tree trunk can be detached from the holding device simply by reversing the twist drill.
  • the knife roller, the drive device on the drive carriage and the associated feed device are expediently actuated by a central control panel, preferably arranged in the area of the debarking tool.
  • a central control panel preferably arranged in the area of the debarking tool.
  • the individual devices are driven by means of electrical energy, but one or more separate motors can also be provided. It is also possible to get the drive by a tractor, e.g. using the same PTO.
  • the arrangement according to the invention can be at least partially collapsible and can be arranged to be movable on a wheeled frame. This enables easy transport, so that the arrangement for debarking tree trunks can be set up directly at the site of the felling.
  • FIG. 1 shows a top view of the arrangement according to the invention in a schematic representation and FIG. 2 shows a side view.
  • 1 shows a section along the line III-III
  • FIG. 4 shows a section along the line IV-IV
  • FIG. 5 shows a section along the line VV in FIG. 2.
  • FIG. 6 shows the knife roller of the debarking tool according to the invention Arrangement shown in view.
  • the arrangement for debarking tree trunks consists of a debarking tool 1 and rails 2 passed underneath it, on which a drive carriage 3 and a support carriage 4 are movably arranged.
  • the tree trunk 5 to be processed which is shown in dash-dotted lines in FIGS. 1 and 2, lies with its ends on the drive carriage 3 and the support carriage 4, which hold it during processing, guide it past the debarking tool 1 and support it.
  • the rails 2 and 6 are placed on supports 8.
  • the rails 6 are arranged somewhat lower than the rails 2.
  • the arrangement shown is provided with transport wheels 9 in the region of its left end.
  • the debarking tool 1 consists of a knife roller 10 which is provided with peeling knives and is rotated by a motor 11 via a chain 12.
  • the knife roller 10 is fastened together with its drive motor 11 on a swivel arm 13 which is held on a stand 14 by means of a swivel bearing 15 so as to be vertically pivotable.
  • the swivel arm 13 is also vertically displaceable on the stand 14 and can be locked at different heights, and can also be pivoted horizontally about the axis of the stand 14. This makes it possible to position the knife roller 10 in the correct position for the loading bring logs of 5 different sizes.
  • the drive car 3 runs on the rails 2 with the aid of four wheels 16.
  • a drive motor 17, a continuously variable transmission 18 and a holding device 19 are arranged on it in the axial direction of the tree trunk 5 to be processed, which are pivoted vertically with the aid of an adjusting spindle 20 can to bring the end of the tree trunk 5 into the desired position.
  • a cable pull drive is provided for the feed of the drive carriage 3, which can be seen in particular from FIG. 2 and consists of a drive motor 23, a cable pull 24 and cable pulleys 25 and 26. The ends of the cable 24 are attached to the drive car 3.
  • the support carriage 4 which can be seen in FIG. 4, has a simple structure. It consists only of four wheels 27 running on the rails 2 and a carrier 28 connecting them, which is bent downward and expediently has a rounded surface.
  • the chute 30 extends with its end facing the debarking tool 1 to below the rails 2, so that it can catch the end of the debarked tree trunk 5 coming from the debarking tool 1.
  • the peeling knives are formed from flat irons 31 which are applied in an upright manner in four screw threads to the surface of the knife roller 10. On its outside, the helical flat irons 31 are turned off coaxially to the surface of the knife roller 10. This creates advantageous cutting surfaces, which bring about an advantageous debarking of the tree trunk without penetrating it too deeply.
  • the tree trunk 5 to be debarked is introduced into the debarking arrangement in the manner shown in FIGS. 1 and 2. It is placed at one end on the drive car 3 and at the other end on the support car 4. The end lying on the drive carriage 3 is then aligned with the aid of the holding device 19 and the adjusting spindle 20 such that the axis of the tree trunk 5 is approximately aligned with the twist drill 21. If this is set in rotation by means of the drive motor 17 and the gear 18 and at the same time the drive carriage 3 is pushed against the debarking tool 1 by means of the cable 24, the twist drill 21 penetrates into the end face of the tree trunk 5 until the stop surface 22 hits the tree trunk 5 .
  • the front end of the tree trunk 5 reaches the area of the debarking tool 1 and there under the knife roller 10. This is arranged at an acute angle, preferably at 45 °, to the axis of the tree trunk 5 and is thus driven to rotate that the peeling blades arranged on their surface move against the direction of rotation of the tree trunk 5.
  • the tree trunk 5 is progressively debarked as it passes under the knife roller 10, which rests on the tree trunk due to its own weight.
  • the knife roller 10 can automatically adjust to different thicknesses of the barked tree trunks.
  • the knife roller 10 can compensate for unevenness and, in the case of crooked tree trunks, follow the vertical movements which the crooked tree trunks carry out about their axis during the rotational movement.
  • the support carriage 4 is designed so that it does not hinder the movements of the tree trunk 5. It is first taken from the tree trunk and passed under the knife roller 10. After passing the debarking tool 1, the support carriage 4 strikes an end stop 32 at the end of the rails 2. The barked tree trunk 5 then slides over the support carriage 4, the support 28 of which is correspondingly round.
  • the barked end of the tree trunk 5 is then caught by the trough-shaped slide 30 of the discharge trolley 7, which runs on the rails 6.
  • the discharge carriage 7 thereby ensures that the debarked tree trunk is properly removed by the debarking tool 1.
  • the feed movement of the drive carriage 3 is set and the direction of rotation of the twist drill 21 is reversed so that it unscrews from the tree trunk 5.
  • the debarked tree trunk can then be removed.
  • the drive carriage 3, the support carriage 4 and the outlet carriage 7 are returned to their starting positions shown in the drawing, whereupon a new tree trunk is inserted into the debarking arrangement and the debarking process can begin again.
  • the debarking arrangement according to the invention works independently of the type of wood of the tree trunk to be debarked and also independently of its dimensions.
  • the tree trunks can be debarked or peeled to any thickness.
  • the debarking or peeling depth can be set and changed simply by changing the feed speed of the drive carriage 3 in relation to the rotational speed of the debarked tree trunk 5 and the knife roller 10. This makes it possible to adapt the debarking depth to the particular nature of the debarked wood and also to process irregular tree trunks precisely.
  • the entire arrangement, in particular the knife roller, the drive device on the drive carriage and the associated feed device are expediently actuated via a centrally arranged control panel, so that the entire debarking process can be monitored and controlled by a single person.

Abstract

The plant for bark-peeling tree-trunks or the like comprises a rotary bark-peeling tool (1) having a cylinder (10) carrying skinning knives (31). Said cylinder (10) may be displaced or hinged to an oscillating arm (13) against the tree-trunk (5). The tree-trunk (5) to be bark-peeled is displaced with respect to the bark-peeling tool (1) in the longitudinal direction by means of wheels (16, 27, 29) guided by rails (2, 6) and rotates about its axis by means of a driving device (18). For simplifying known bark-peeling machines and enabling the processing of known circular and curved tree-trunks, the plant is provided with a holding device (19) at one end of the tree-trunk (5), which holding device is combined with the driving device (18) which rotates the trunk, and is also provided with a support device (28) located in the region of the bark-peeling cylinder (10) for insuring a loose support of the tree-trunk (5); the skinning knives (31) carried by the cylinder (10) form an acute angle with respect to the tree-trunk axis.

Description

Die Erfindung bezieht sich auf eine Anordnung zum Entrinden von Baumstämmen od.dgl., mit einem rotierenden Entrindungswerkzeug, das aus einer mit Schälmessern versehenen Messerwalze besteht, die auf einem Schwenkarm gegen den Baumstamm verschiebbar oder verschwenkbar angeordnet ist, wobei der zu entrindende Baumstamm in Richtung seiner Längsachse mit Hilfe von auf Schienen geführten Rädern relativ zum Entrindungswerkzeug verschiebbar ist und hierbei mittels einer Antriebsvorrichtung um seine Achse gedreht wird, und wobei an einem Ende des Baumstammes eine Haltevorrichtung mit der Antriebsvorrichtung für das Drehen des Baumstammes und im Bereich der Messerwalze eine Abstützvorrichtung für die lose Abstützung des Baumstammes vorgesehen ist.The invention relates to an arrangement for debarking tree trunks or the like., With a rotating debarking tool, which consists of a knife roller provided with peeling knives, which is arranged on a swivel arm against the tree trunk so that the tree trunk to be debarked can be swiveled or pivoted its longitudinal axis can be moved relative to the debarking tool with the help of wheels guided on rails and is rotated about its axis by means of a drive device, and at one end of the log a holding device with the drive device for rotating the log and in the area of the knife roller a support device for the loose support of the tree trunk is provided.

Das Entrinden von Baumstämmen und stärkeren Ästen geschieht auch heute noch oft in mühsamer Handarbeit. Der hauptsächliche Grund dafür dürfte darin bestehen, dass keine ausreichend einfache und transportable Maschine zur Verfügung steht, die eine Entrindung an Ort und Stelle, also unmittelbar an die Schlägerung anschliessend im Wald, ermöglicht. Der Transport der Stämme zu ortsfesten Entrindungsanlagen ist umständlich und teuer. Hinzu kommt, dass viele ortsfeste Entrindungsanlagen aus räumlichen Gründen nur Baumstämme mit begrenzter Länge bearbeiten können.The barking of tree trunks and thick branches is still often done with laborious manual work. The main reason for this is probably that there is no sufficiently simple and transportable machine available that enables debarking on the spot, i.e. immediately after the logging in the forest. Transporting the logs to fixed debarking systems is cumbersome and expensive. In addition, many fixed debarking systems can only process tree trunks of limited length for spatial reasons.

Es sind schon mehrere Ausführungen der eingangs angeführten Anordnung zum Schälen und Entrinden von Baumstämmen bekannt (US-A 2689591, US-A 1986708, US-A 3416581 und FR-A 1 125189), bei denen die mit Schälmessern versehene rotierende Messerwalze auf einem Schwenkarm angeordnet ist. Der zu entrindende Baumstamm wird an der Messerwalze vorbeigeführt und hiebei um seine Achse gedreht. Die Messerwalze ist bei den bekannten Ausführungen auf dem Schwenkarm so angeordnet, dass ihre Drehachse entweder in Längsrichtung des Baumstammes (US-A 2689591) oder im rechten Winkel dazu (FR-A 1 125189) verläuft. Der Baumstamm selbst ist auf Rollen abgestützt, die zum Verdrehen des Baumstammes rotierend angetrieben sind. Mit diesen bekannten Anordnungen können nur Baumstämme entrindet werden, die verhältnismässig gerade gewachsen sind, weil bei Baumstämmen mit stark unrundem Querschnitt oder mit gekrümmt verlaufender Achse der die Messerwalze tragende Schwenkarm durch die Rotationsbewegungen des Baumstammes zu grosse Schwenkbewegungen ausführen muss, um eine einwandfreie Bearbeitung zu ermöglichen. Mit der Anordnung nach der US-A 2689591 wird auch in erster Linie nicht eine vollständige Entrindung, sondern die Herstellung eines zylindrischen oder konischen Rundholzes angestrebt. Ausserdem sind die bekannten Ausführungen verhältnismässig aufwendig aufgebaut, so dass sie praktisch nur für den ortsfesten Betrieb geeignet sind.There are already several designs of the arrangement mentioned above for peeling and debarking tree trunks (US-A 2689591, US-A 1986708, US-A 3416581 and FR-A 1 125189), in which the rotating knife roller provided with peeling knives on a swivel arm is arranged. The tree trunk to be debarked is guided past the knife roller and rotated around its axis. In the known designs, the knife roller is arranged on the swivel arm in such a way that its axis of rotation runs either in the longitudinal direction of the tree trunk (US-A 2689591) or at right angles thereto (FR-A 1 125189). The tree trunk itself is supported on rollers which are driven to rotate the tree trunk. With these known arrangements, only tree trunks can be debarked that have grown relatively straight, because with tree trunks with a strongly non-circular cross-section or with a curved axis, the swivel arm carrying the knife roller has to perform too large swiveling movements due to the rotational movements of the tree trunk in order to enable perfect processing . With the arrangement according to US-A 2689591, the aim is not primarily to completely debark, but rather to produce a cylindrical or conical log. In addition, the known designs are relatively complex, so that they are practically only suitable for stationary operation.

Weiterhin ist es bekannt, bei Maschinen für die Bearbeitung von Baumstämmen die Schälmesser in ein- oder mehrgängigen Schraubenlinien auf der Oberfläche der Messerwalze anzubringen. Bei einer bekannten Ausführung (DE-AS 2712985) sind auf einer schraubenlinienförmig verlaufenden Halterung Schälleisten angeordnet, die durch auf dem Mantel der Walze in Achsrichtung verlaufende Messerleisten ergänzt sind. Bei einer ähnlichen bekannten Ausführung (DE-PS 961208) besitzen die schraubenlinienförmigen Schälmesser ein kompliziertes Profil, das sich aus Radialschneiden, einer Kammfläche, einer Schneidkante und einer Nut zusammensetzt. Die Drehachse der Messerwalze verläuft auch dort achsparallel zu den zu bearbeitenden Baumstämmen. Ausserdem sind die verwendeten Schälmesser kompliziert und nützen sich rasch ab, so dass sie nachgeschliffen werden müssen. Bei einigen Ausführungen sind eigene Tiefenbegrenzer erforderlich, um ein zu tiefes Eindringen der Schälmesser in den Baumstamm zu verhindern.Furthermore, it is known to attach peeling knives in single-thread or multi-thread screw lines to the surface of the knife roller in machines for processing tree trunks. In a known embodiment (DE-AS 2712985), peeling strips are arranged on a helical bracket, which are supplemented by knife strips running in the axial direction on the jacket of the roller. In a similar known embodiment (DE-PS 961208), the helical peeling knives have a complicated profile, which is composed of radial cutting, a comb surface, a cutting edge and a groove. There, too, the axis of rotation of the knife roller runs axially parallel to the tree trunks to be processed. In addition, the peeling knives used are complicated and wear out quickly, so that they have to be reground. Some versions require their own depth limiters to prevent the peeling knife from penetrating too deep into the tree trunk.

Der Erfindung liegt die Aufgabe zugrunde, auch unrund und krumm gewachsene Langholz-Baumstämme vollständig zu entrinden, dabei zu verhindern, dass sich die Schälmesser im Holz festbeissen und gleichzeitig zu erreichen, dass sich die Schälmesser bei der Bearbeitung selbst schärfen.The invention has for its object to completely debark even round and crooked long logs, to prevent the peeling knife from biting into the wood and at the same time to ensure that the peeling knife sharpen itself during processing.

Die erfindungsgemässe Anordnung ist dadurch gekennzeichnet, dass die Drehachse der Messerwalze zur Achse des Baumstammes unter spitzem Winkel verläuft und dass die Schälmesser in an sich bekannter Weise aus ein- oder mehrgängig in Schraubenlinien auf der Oberfläche der Messerwalze hochkant aufgebrachten Flacheisen bestehen, die über die Walzenoberfläche vorstehen und mit ihrer Aussenseite zu dieser konzentrisch verlaufen. Dies ergibt eine überraschend einfach aufgebaute Anordnung, mit der trotzdem Langholz jeder Länge und jeder Holzart entrindet werden kann. Da der Baumstamm während der Bearbeitung nur im Bereich der Messerwalze lose abgestützt ist, können unrunde und krumm gewachsene Baumstämme ohne Schwierigkeiten bearbeitet werden. Die im Bereich der Messerwalze auftretenden verhältnismässig kleinen Schwenkbewegungen können vom Schwenkarm ohne Beinträchtigung der Bearbeitungsqualität ausgeglichen werden, so dass immer eine vollständige Entrindung des Baumstammes gewährleistet ist. Dies wird insbesondere auch dadurch erleichtert, dass bei der erfindungsgemässen Anordnung die Länge der berührenden Mantellinien von Messerwalze und Baumstamm gegenüber den bekannten Ausführungen wesentlich (theoretisch zu einem Punkt) verkürzt sind.The arrangement according to the invention is characterized in that the axis of rotation of the knife roller is at an acute angle to the axis of the tree trunk and that the peeling knives consist, in a manner known per se, of flat or vertically applied flat iron in helical lines on the surface of the knife roller, which lie above the roller surface protrude and are concentric with their outside to this. This results in a surprisingly simple arrangement, with which long wood of any length and any type of wood can still be debarked. Since the tree trunk is only loosely supported in the area of the knife roller during processing, non-round and crooked tree trunks can be processed without difficulty. The relatively small swivel movements occurring in the area of the knife roller can be compensated for by the swivel arm without impairing the processing quality, so that a complete debarking of the tree trunk is always guaranteed. This is particularly facilitated by the fact that, in the arrangement according to the invention, the length of the contacting surface lines of knife roller and tree trunk are shortened significantly (theoretically to one point) compared to the known designs.

In einem Arbeitsgang mit dem Entrinden können Astansätze und der Wurzelanlauf entfernt werden, wobei die Bearbeitungsintensität und die Schältiefe durch Regelung der Vorschubbewegung und der Drehgeschwindigkeit des Baumstammes sowie der Rotationsgeschwindigkeit der Messerwalze nach Bedarf gewählt werden können. Fühler und Abstützungen zum Einstellen der Schältiefe sind nicht erforderlich. Die Rinde wird mit dem Rücken des Messers weggeschoben, so dass sich das Schälmesser im Holz des Baumstammes nicht festbeissen kann und auch stark verschmutztes Holz, z.B. mit in der Rinde haftenden Steinchen, gefahrlos bearbeitet werden kann. Die Schälmesser schärfen sich bei der Bearbeitung selbst. Die Drehrichtung der Messerwalze und des bearbeiteten Baumstammes sind vorteilhaft einander entgegengerichtet.Knots and root run-off can be removed in one step, with the processing intensity and the peeling depth being selected as required by regulating the feed movement and the rotational speed of the tree trunk and the rotational speed of the knife roller. Sensors and supports for adjusting the Peeling depth is not necessary. The bark is pushed away with the back of the knife, so that the peeling knife cannot bite into the wood of the tree trunk and even heavily soiled wood, for example with stones stuck in the bark, can be processed safely. The peeling knives sharpen themselves during processing. The direction of rotation of the knife roller and the processed tree trunk are advantageously opposite to each other.

In weiterer Ausgestaltung der Erfindung kann die Haltevorrichtung auf einem auf Schienen laufenden Antriebswagen angeordnet sein, der in Vorschubrichtung des zu entrindenden Baumstammes vor der Messerwalze vorgesehen ist, die Antriebsvorrichtung für das Drehen des Baumstammes trägt und in an sich bekannter Weise mit Hilfe einer Vorschubeinrichtung gegen die Messerwalze fahrbar ist. Mit Hilfe dieser Haltevorrichtung wird der zu bearbeitende Baumstamm lediglich an seinem einen Ende gehalten, um seine Achse gedreht und gegen die Messerwalze vorgeschoben. An seinem anderen Ende ist der Baumstamm frei beweglich, so dass er mit diesem Ende ausschwingen kann, wenn seine Achse gekrümmt verläuft.In a further embodiment of the invention, the holding device can be arranged on a drive carriage running on rails, which is provided in the feed direction of the tree trunk to be debarked in front of the knife roller, carries the drive device for rotating the tree trunk and in a known manner with the aid of a feed device against the Knife roller is mobile. With the help of this holding device, the tree trunk to be processed is only held at one end, rotated about its axis and advanced against the knife roller. At its other end, the tree trunk can move freely so that it can swing out with this end if its axis is curved.

Die Abstützvorrichtung kann auf einem Stützwagen angeordnet sein, der im Bereich der Messerwalze arretierbar ist, und es kann in Vorschubrichtung des Baumstammes hinter der Messerwalze ein Auslaufwagen für die Aufnahme des entrindeten Endes des Baumstammes auf Schienen frei verschiebbar geführt sein, der vorzugsweise eine wannenförmige Rutsche aufweist, die das bearbeitete Ende des Baumstammes auffängt. Hiebei stützt die Abstützvorrichtung das vordere Ende des Baumstammes schon vor Beginn der Bearbeitung ab. Der Stützwagen wird sodann auf den Schienen bis in den Bereich der Messerwalze mit dem Baumstamm mitgeführt und dort abgebremst, worauf der Baumstamm über den Stützwagen gleitet. Sein entrindetes Ende wird vom Auslaufwagen aufgefangen. Eine einfache und zweckmässige Ausführungsform der Abstützvorrichtung besteht dabei aus einem zur Vorschubrichtung quer angeordneten Träger mit abgerundeter Oberfläche, der vorzugsweise nach unten durchgebogen ist und eine Gleitführung für den Baumstamm bildet.The support device can be arranged on a support carriage, which can be locked in the area of the knife roller, and an outlet carriage for receiving the barked end of the tree trunk can be freely displaceably guided on rails in the feed direction of the tree trunk, which preferably has a trough-shaped slide that catches the machined end of the tree trunk. The support device supports the front end of the tree trunk even before processing begins. The support carriage is then carried on the rails to the area of the knife roller with the tree trunk and braked there, whereupon the tree trunk slides over the support carriage. Its barked end is caught by the discharge cart. A simple and expedient embodiment of the support device consists of a carrier with a rounded surface which is arranged transversely to the direction of advance and which is preferably bent downward and forms a sliding guide for the tree trunk.

Bei einer bevorzugten Ausführungsform der Erfindung besteht die Antriebsvorrichtung für das Drehen des Baumstammes aus einem rotierenden Spiralbohrer und einer diesen konzentrisch umgebenden Anschlagfläche mit vorspringenden Zacken. Der Spiralbohrer, der durch die Antriebsvorrichtung gedreht wird, schraubt sich beim Auftreffen auf die Stirnseite des Baumstammes in diesen ein, bis die Zacken fest am Baumstamm anliegen und diesen mitnehmen. Wenn die Antriebsvorrichtung mit einem Rückwärtsgang versehen ist, kann der fertigbearbeitete Baumstamm durch blosses Umsteuern des Spiralbohrers von der Haltevorrichtung gelöst werden.In a preferred embodiment of the invention, the drive device for rotating the tree trunk consists of a rotating twist drill and a stop surface concentrically surrounding it with projecting prongs. The twist drill, which is rotated by the drive device, screws into the end of the tree trunk when it hits the end of the tree trunk until the prongs lie firmly against the tree trunk and take it along. If the drive device is provided with a reverse gear, the finished tree trunk can be detached from the holding device simply by reversing the twist drill.

Die Messerwalze, die Antriebsvorrichtung auf dem Antriebswagen und die zugehörige Vorschubeinrichtung werden zweckmässig von einem zentralen, vorzugsweise im Bereich des Entrindungswerkzeuges angeordneten Steuerpult betätigt. Dadurch ist eine Bedienung der gesamten Entrindungsanordnung durch eine einzige Person möglich, die durch Verstellen und Anpassen der Vorschubgeschwindigkeit die Entrindungstiefe einfach regeln kann. Der Antrieb der einzelnen Vorrichtungen erfolgt nach Möglichkeit mittels elektrischer Energie, es können aber auch ein oder mehrere eigene Motore vorgesehen sein. Auch ist es möglich, den Antrieb durch einen Schlepper zu besorgen, z.B. mit Hilfe der Zapfwelle desselben. Die erfindungsgemässe Anordnung kann schliesslich zumindest teilweise zusammenlegbar ausgebildet und auf einem mit Rädern versehenen Rahmen fahrbar angeordnet sein. Dadurch ist ein leichter Transport möglich, so dass die Anordnung zum Entrinden von Baumstämmen unmittelbar am Ort der Schlägerung aufgestellt werden kann.The knife roller, the drive device on the drive carriage and the associated feed device are expediently actuated by a central control panel, preferably arranged in the area of the debarking tool. This makes it possible for the entire debarking arrangement to be operated by a single person, who can easily regulate the debarking depth by adjusting and adjusting the feed rate. If possible, the individual devices are driven by means of electrical energy, but one or more separate motors can also be provided. It is also possible to get the drive by a tractor, e.g. using the same PTO. Finally, the arrangement according to the invention can be at least partially collapsible and can be arranged to be movable on a wheeled frame. This enables easy transport, so that the arrangement for debarking tree trunks can be set up directly at the site of the felling.

In der Zeichnung ist ein Ausführungsbeispiel der erfindungsgemässen Anordnung näher erläutert. Fig. 1 zeigt eine Draufsicht auf die erfindungsgemässe Anordnung in schematischer Darstellung und Fig.2 dazu eine Seitenansicht. Fig. zeigt einen Schnitt nach der Linie III-III, Fig. 4 einen Schnitt nach der Linie IV-IV und Fig. 5 einen Schnitt nach der Linie V-V in Fig. 2. In Fig. 6 ist schliesslich die Messerwalze des Entrindungswerkzeuges der erfindungsgemässen Anordnung in Ansicht dargestellt.In the drawing, an embodiment of the arrangement according to the invention is explained in more detail. 1 shows a top view of the arrangement according to the invention in a schematic representation and FIG. 2 shows a side view. 1 shows a section along the line III-III, FIG. 4 shows a section along the line IV-IV and FIG. 5 shows a section along the line VV in FIG. 2. Finally, FIG. 6 shows the knife roller of the debarking tool according to the invention Arrangement shown in view.

Im Ausführungsbeispiel besteht die Anordnung zum Entrinden von Baumstämmen aus einem Entrindungswerkzeug 1 und unter diesem durchgeführten Schienen 2, auf denen ein Antriebswagen 3 und ein Stützwagen 4 fahrbar angeordnet sind. Der zu bearbeitende Baumstamm 5, der in den Fig. 1 und 2 strichpunktiert eingezeichnet ist, liegt mit seinen Enden auf dem Antriebswagen 3 und demStützwagen 4 auf, die ihn während der Bearbeitung halten, am Entrindungswerkzeug 1 vorbeiführen und abstützen. Auf der anderen Seite des Entrindungswerkzeuges 1 sind weitere Schienen 6 vorgesehen, auf denen ein Auslaufwagen 7 fahrbar ist. Die Schienen 2 und 6 sind auf Stützen 8 abgestellt. Die Schienen 6 sind etwas tiefer angeordnet als die Schienen 2. Ausserdem ist die dargestellte Anordnung im Bereich ihres linken Endes mit Transporträdern 9 versehen.In the exemplary embodiment, the arrangement for debarking tree trunks consists of a debarking tool 1 and rails 2 passed underneath it, on which a drive carriage 3 and a support carriage 4 are movably arranged. The tree trunk 5 to be processed, which is shown in dash-dotted lines in FIGS. 1 and 2, lies with its ends on the drive carriage 3 and the support carriage 4, which hold it during processing, guide it past the debarking tool 1 and support it. On the other side of the debarking tool 1, further rails 6 are provided, on which an outlet carriage 7 can be moved. The rails 2 and 6 are placed on supports 8. The rails 6 are arranged somewhat lower than the rails 2. In addition, the arrangement shown is provided with transport wheels 9 in the region of its left end.

Das Entrindungswerkzeug 1 besteht aus einer Messerwalze 10, die mit Schälmessern versehen ist und durch einen Motor 11 über eine Kette 12 gedreht wird. Die Messerwalze 10 ist gemeinsam mit ihrem Antriebsmotor 11 auf einem Schwenkarm 13 befestigt, der an einem Ständer 14 mittels eines Schwenklagers 15 vertikal verschwenkbar gehalten ist. Der Schwenkarm 13 ist auf dem Ständer 14 ausserdem vertikal verschiebbar und in verschiedenen Höhen feststellbar, sowie auch um die Achse des Ständers 14 horizontal verschwenkbar. Dadurch ist es möglich, die Messerwalze 10 in die jeweils richtige Position für die Bearbeitung von Baumstämmen 5 unterschiedlicher Grösse zu bringen.The debarking tool 1 consists of a knife roller 10 which is provided with peeling knives and is rotated by a motor 11 via a chain 12. The knife roller 10 is fastened together with its drive motor 11 on a swivel arm 13 which is held on a stand 14 by means of a swivel bearing 15 so as to be vertically pivotable. The swivel arm 13 is also vertically displaceable on the stand 14 and can be locked at different heights, and can also be pivoted horizontally about the axis of the stand 14. This makes it possible to position the knife roller 10 in the correct position for the loading bring logs of 5 different sizes.

Der Antriebswagen 3 läuft mit Hilfe von vier Rädern 16 auf den Schienen 2. Auf ihm sind in Achsrichtung des zu bearbeitenden Baumstammes 5 hintereinander ein Antriebsmotor 17, ein stufenlos verstellbares Getriebe 18 und eine Haltevorrichtung 19 angeordnet, die mit Hilfe einer Verstellspindel 20 vertikal verschwenkt werden kann, um das Ende des Baumstammes 5 in die gewünschte Position zu bringen. Über der Haltevorrichtung 19 befindet sich ein kurzer Spiralbohrer 21, mit einer Anschlagfläche 22, die mit axial vorragenden Zacken versehen ist. Für den Vorschub des Antriebswagens 3 ist ein Seilzugtrieb vorgesehen, der insbesondere aus Fig. 2 zu erkennen ist und aus einem Antriebsmotor 23, aus einem Seilzug 24 und aus Seilrollen 25 und 26 besteht. Die Enden des Seilzuges 24 sind am Antriebswagen 3 befestigt.The drive car 3 runs on the rails 2 with the aid of four wheels 16. A drive motor 17, a continuously variable transmission 18 and a holding device 19 are arranged on it in the axial direction of the tree trunk 5 to be processed, which are pivoted vertically with the aid of an adjusting spindle 20 can to bring the end of the tree trunk 5 into the desired position. There is a short twist drill 21 above the holding device 19, with a stop surface 22 which is provided with axially projecting teeth. A cable pull drive is provided for the feed of the drive carriage 3, which can be seen in particular from FIG. 2 and consists of a drive motor 23, a cable pull 24 and cable pulleys 25 and 26. The ends of the cable 24 are attached to the drive car 3.

Der Stützwagen 4, der in Fig. 4 in Ansicht zu sehen ist, besitzt einen einfachen Aufbau. Er besteht lediglich aus vier auf den Schienen 2 laufenden Rädern 27 und einem diese verbindenen Träger 28, der nach unten durchgebogen ist und zweckmässig eine abgerundete Oberfläche besitzt.The support carriage 4, which can be seen in FIG. 4, has a simple structure. It consists only of four wheels 27 running on the rails 2 and a carrier 28 connecting them, which is bent downward and expediently has a rounded surface.

Auch der Auslaufwagen 7, der insbesondere aus Fig. 5 zu erkennen ist, besitzt vier Räder 29, die auf den Schienen 6 laufen, und ist mit einer wannenartigen Rutsche 30 versehen. Die Rutsche 30 reicht mit ihrem dem Entrindungswerkzeug 1 zugewendeten Ende bis unter die Schienen 2, so dass sie das Ende des aus dem Entrindungswerkzeug 1 kommenden entrindeten Baumstammes 5 auffangen kann.The discharge carriage 7, which can be seen in particular from FIG. 5, also has four wheels 29 which run on the rails 6 and is provided with a trough-like slide 30. The chute 30 extends with its end facing the debarking tool 1 to below the rails 2, so that it can catch the end of the debarked tree trunk 5 coming from the debarking tool 1.

Fig.6 zeigt eine bevorzugte Ausführung der Messerwalze 10. Die Schälmesser sind aus Flacheisen 31 gebildet, die hochkant in vier Schraubengängen auf die Oberfläche der Messerwalze 10 aufgebracht sind. An ihrer Aussenseite sind die schraubenlinienförmigen Flacheisen 31 koaxial zur Oberfläche der Messerwalze 10 abgedreht. Dadurch entstehen vorteilhafte Schneideflächen, die ein vorteilhaftes Entrinden des Baumstammes bewirken, ohne zu tief in diesen einzudringen.6 shows a preferred embodiment of the knife roller 10. The peeling knives are formed from flat irons 31 which are applied in an upright manner in four screw threads to the surface of the knife roller 10. On its outside, the helical flat irons 31 are turned off coaxially to the surface of the knife roller 10. This creates advantageous cutting surfaces, which bring about an advantageous debarking of the tree trunk without penetrating it too deeply.

Der zu entrindende Baumstamm 5 wird in der in den Fig. 1 und 2 gezeigten Weise in die Entrindungsanordnung eingebracht. Er wird mit einem Ende auf den Antriebswagen 3 und mit dem anderen Ende auf den Stützwagen 4 aufgelegt. Sodann wird das auf dem Antriebswagen 3 liegende Ende mit Hilfe der Haltevorrichtung 19 und der Verstellspindel 20 so ausgerichtet, dass die Achse des Baumstammes 5 ungefähr auf den Spiralbohrer 21 ausgerichtet ist. Wenn dieser mittels des Antriebsmotors 17 und des Getriebes 18 in Drehung versetzt und gleichzeitig der Antriebswagen 3 mittels des Seilzuges 24 gegen das Entrindungswerkzeug 1 vorgeschoben wird, dringt der Spiralbohrer 21 in die Stirnseite des Baumstammes 5 ein, bis die Anschlagfläche 22 auf dem Baumstamm 5 auftrifft. Die auf der Anschlagfläche 22 vorgesehenen Zacken dringen in den Baumstamm ein, so dass dieser mitgenommen und um seine Achse gedreht wird. Bei weiterem Vorschub des Antriebswagens 3 gelangt der Baumstamm 5 mit seinem vorderen Ende in den Bereich des Entrindungswerkzeuges 1 und dort unter die Messerwalze 10. Diese ist zur Achse des Baumstammes 5 unter einem spitzen Winkel, vorzugsweise unter 45°, angeordnet und wird so rotierend angetrieben, dass die auf ihrer Oberfläche angeordneten Schälmesser sich auf der Oberfläche des Baumstammes 5 gegen dessen Drehrichtung bewegen. Der Baumstamm 5 wird während des Hindurchführens unter der Messerwalze 10, die durch ihr Eigengewicht auf dem Baumstamm aufliegt, fortschreitend entrindet.The tree trunk 5 to be debarked is introduced into the debarking arrangement in the manner shown in FIGS. 1 and 2. It is placed at one end on the drive car 3 and at the other end on the support car 4. The end lying on the drive carriage 3 is then aligned with the aid of the holding device 19 and the adjusting spindle 20 such that the axis of the tree trunk 5 is approximately aligned with the twist drill 21. If this is set in rotation by means of the drive motor 17 and the gear 18 and at the same time the drive carriage 3 is pushed against the debarking tool 1 by means of the cable 24, the twist drill 21 penetrates into the end face of the tree trunk 5 until the stop surface 22 hits the tree trunk 5 . The teeth provided on the stop surface 22 penetrate the tree trunk so that it is taken along and rotated about its axis. When the drive carriage 3 is advanced further, the front end of the tree trunk 5 reaches the area of the debarking tool 1 and there under the knife roller 10. This is arranged at an acute angle, preferably at 45 °, to the axis of the tree trunk 5 and is thus driven to rotate that the peeling blades arranged on their surface move against the direction of rotation of the tree trunk 5. The tree trunk 5 is progressively debarked as it passes under the knife roller 10, which rests on the tree trunk due to its own weight.

Durch die schwenkbare Aufhängung der Messerwalze 10 mit Hilfe des Schwenkarmes 13 kann sich die Messerwalze 10 auf unterschiedliche Dicken der entrindeten Baumstämme automatisch einstellen. Ausserdem kann die Messerwalze 10 Unebenheiten ausgleichen und bei krummen Baumstämmen den Vertikalbewegungen folgen, welche die krummen Baumstämme während der Drehbewegung um ihre Achse ausführen. Der Stützwagen 4 ist so ausgeführt, dass er die Bewegungen des Baumstammes 5 nicht behindert. Er wird zunächst vom Baumstamm mitgenommen und unter der Messerwalze 10 hindurchgeführt. Nach Passieren des Entrindungswerkzeuges 1 trifft der Stützwagen 4 am Ende der Schienen 2 auf einen Endanschlag 32 auf. Der entrindete Baumstamm 5 gleitet sodann über den Stützwagen 4 hinweg, dessen Träger 28 entsprechend rund ausgebildet ist. Anschliessend wird das entrindete Ende des Baumstammes 5 sodann von der wannenförmigen Rutsche 30 des Auslaufwagens 7 aufgefangen, der auf den Schienen 6 läuft. Der Auslaufwagen 7 stellt dadurch sicher, dass der entrindete Baumstamm vom Entrindungswerkzeug 1 ordungsgemäss abgeführt wird. Sobald der gesamte Baumstamm 5 durch das Entrindungswerkzeug 1 hindurchgelaufen ist, wird die Vorschubbewegung des Antriebswagens 3 eingestellt und die Drehrichtung des Spiralbohrers 21 umgesteuert, so dass dieser sich aus dem Baumstamm 5 herausschraubt. Der entrindete Baumstamm kann sodann abtransportiert werden. Der Antriebswagen 3, der Stützwagen 4 und der Auslaufwagen 7 werden in ihre in der Zeichnung dargestellten Ausgangslagen zurückgebracht, worauf ein neuer Baumstamm in die Entrindungsanordnung eingelegt werden und der Entrindungsvorgang von neuem beginnen kann.Due to the pivotable suspension of the knife roller 10 with the aid of the swivel arm 13, the knife roller 10 can automatically adjust to different thicknesses of the barked tree trunks. In addition, the knife roller 10 can compensate for unevenness and, in the case of crooked tree trunks, follow the vertical movements which the crooked tree trunks carry out about their axis during the rotational movement. The support carriage 4 is designed so that it does not hinder the movements of the tree trunk 5. It is first taken from the tree trunk and passed under the knife roller 10. After passing the debarking tool 1, the support carriage 4 strikes an end stop 32 at the end of the rails 2. The barked tree trunk 5 then slides over the support carriage 4, the support 28 of which is correspondingly round. The barked end of the tree trunk 5 is then caught by the trough-shaped slide 30 of the discharge trolley 7, which runs on the rails 6. The discharge carriage 7 thereby ensures that the debarked tree trunk is properly removed by the debarking tool 1. As soon as the entire tree trunk 5 has passed through the debarking tool 1, the feed movement of the drive carriage 3 is set and the direction of rotation of the twist drill 21 is reversed so that it unscrews from the tree trunk 5. The debarked tree trunk can then be removed. The drive carriage 3, the support carriage 4 and the outlet carriage 7 are returned to their starting positions shown in the drawing, whereupon a new tree trunk is inserted into the debarking arrangement and the debarking process can begin again.

Die erfindungsgemässe Entrindungsanordnung arbeitet unabhängig von der Holzart des zu entrindenden Baumstammes und auch unabhängig von dessen Abmessungen. Dabei können die Baumstämme auf jede beliebige Stärke entrindet oder auch geschält werden. Die Entrindungs-oder Schältiefe kann einfach durch Verändern der Vorschubgeschwindigkeit des Antriebswagens 3 im Verhältnis zur Drehgeschwindigkeit des entrindeten Baumstammes 5 und der Messerwalze 10 eingestellt und verändert werden. Dadurch ist es möglich, die Entrindungstiefe der jeweiligen Beschaffenheit des entrindeten Holzes anzupassen und auch unregelmässige Baumstämme genau zu bearbeiten. Zweckmässig wird die gesamte Anordnung, insbesondere die Messerwalze, die Antriebsvorrichtung auf dem Antriebswagen und die zugehörige Vorschubeinrichtung über ein zentral angeordnetes Steuerpult betätigt, so dass der gesamte Entrindungsvorgang von einer einzigen Person überwacht und gesteuert werden kann.The debarking arrangement according to the invention works independently of the type of wood of the tree trunk to be debarked and also independently of its dimensions. The tree trunks can be debarked or peeled to any thickness. The debarking or peeling depth can be set and changed simply by changing the feed speed of the drive carriage 3 in relation to the rotational speed of the debarked tree trunk 5 and the knife roller 10. This makes it possible to adapt the debarking depth to the particular nature of the debarked wood and also to process irregular tree trunks precisely. The entire arrangement, in particular the knife roller, the drive device on the drive carriage and the associated feed device, are expediently actuated via a centrally arranged control panel, so that the entire debarking process can be monitored and controlled by a single person.

Claims (5)

1. A device for bark-peeling tree trunks or the like having a rotating bark-peeling tool (1), which comprises a knife roller (10) which is provided with skinning knives and which is mounted on a pivot arm (13) so as to be displaceable or pivotable towards the tree trunk (5), the tree trunk (5) from which the bark is to be peeled being displaceable relative to the bark-peeling tool (1) in the direction of its longitudinal axis with the aid of wheels (16, 27) guided on rails (2) and being rotated about its axis by means of a driving apparatus, and a holding apparatus (19) with the driving apparatus for rotating the tree trunk (5) being provided at one end of the tree trunk (5) and a supporting apparatus (28) for loosely supporting the tree trunk (5) being provided in the region of the knife roller (10), characterized in that the axis of rotation of the knife roller (10) extends at an acute angle to the axis of the tree trunk (5) and the skinning knives consist in a manner known per se of flat bars (31) which are mounted on edge in single- or multiple-thread helices on the surface of the knife roller (10) and which project beyond the roller surface and with their outer surface extend concentric to the latter.
2. A device according to Claim 1, characterized in that the holding apparatus (19) is mounted on a driving carriage (3) which runs on rails (2) and which is provided - in the advancing direction of the tree trunk (5) from which bark is to be peeled - in front of the knife roller (10), supports the driving apparatus for rotating the three trunk (5) and may be moved towards the knife roller (10) in a manner known per se with the aid of an advancing device.
3. A device according to Claim 1 or 2, characterized in that the supporting apparatus (28) is disposed on a supporting carriage (4) which may be locked in the region of the knife roller (10), and a delivery carriage (7), which preferably comprises a through-like chute (30) which receives the processed end of the tree drunk (5), is guided freely displaceably on rails (6) in the advancing direction of the tree trunk (5) behind the knife roller (10) so as to receive the end of the tree trunk (5) from which the bark has been peeled.
4. A device according to Claims 1, 2, or 3, characterized in that the supporting apparatus (28) comprises a support member (28) arranged transversely to the advancing direction and having a rounded surface which is preferably curved downwards and forms a sliding guide for the tree trunk (5).
35. A device according to any one of Claims 1 to 4, characterized in that the driving apparatus for rotating the tree trunk (5) comprises a rotating twist drill (21) and a stop surface (22) with projecting prongs which surrounds the latter concentri- cally.
EP84901717A 1983-05-10 1984-04-27 Plant for bark-peeling tree-trunks or the like Expired EP0141831B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1717/83 1983-05-10
AT0171783A AT377943B (en) 1983-05-10 1983-05-10 ARRANGEMENT FOR UNLEASHING TREE TRUNKS OR THE LIKE.

Publications (2)

Publication Number Publication Date
EP0141831A1 EP0141831A1 (en) 1985-05-22
EP0141831B1 true EP0141831B1 (en) 1988-07-13

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EP84901717A Expired EP0141831B1 (en) 1983-05-10 1984-04-27 Plant for bark-peeling tree-trunks or the like

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US (1) US4590979A (en)
EP (1) EP0141831B1 (en)
AT (1) AT377943B (en)
CA (1) CA1223177A (en)
DE (1) DE3472644D1 (en)
IT (1) IT1173595B (en)
WO (1) WO1984004485A1 (en)

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Publication number Priority date Publication date Assignee Title
HUT54547A (en) * 1989-08-24 1991-03-28 Franz Attems Cutter for woodworking
AT406843B (en) * 1999-04-07 2000-09-25 Johann Wolf DEVICE FOR TREATING TRUNKS
US7931152B2 (en) * 2006-07-07 2011-04-26 Andritz Oy Shuffling apparatus and method for aligning wood logs in a conveyor

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DE322221C (en) * 1918-10-15 1920-06-23 Xaver Konrad Feed on pole and pole peeling machines
US1986708A (en) * 1929-11-23 1935-01-01 Bezner Albert Decorticating device for timber
US1921904A (en) * 1929-11-23 1933-08-08 Bezner Albert Decorticating device for timber
US2230336A (en) * 1937-07-07 1941-02-04 Taylor Colquitt Co Rossing machine
DE710512C (en) * 1937-12-21 1941-09-15 Ernst Wilhelm Neuer Device for unborking tree bark
DE742608C (en) * 1939-10-31 1943-12-08 Hans Wiedenmann Bark peeling machine
US2642904A (en) * 1951-02-06 1953-06-23 John H Pearce Log debarker and chipper
DE904241C (en) * 1951-03-16 1955-03-07 Alois Nagel Machine for whitening pulpwood
US2689591A (en) * 1953-06-26 1954-09-21 Omar V Woodard Log-peeling machine having cutter and log-handling carriages movable on transversely extending trackways
GB743885A (en) * 1953-09-09 1956-01-25 J R Gordon & Co Ltd Improved de-barking machine
US2726691A (en) * 1953-09-09 1955-12-13 J R Gordon & Co Ltd Debarking machine having underlying bark-stripping helical rollers and an overlying adjustable pressure roller
FR1125189A (en) * 1955-04-29 1956-10-25 Installation for debarking logs
DE961208C (en) * 1955-05-17 1957-04-04 Valo V L Bark peeling machine
AT200785B (en) * 1956-10-26 1958-11-25 I C I Societa Agricola Ind Per Mechanical peeling device for logs
US3416581A (en) * 1966-05-25 1968-12-17 Lloyd A Parrish Log debarking apparatus
DE2516290A1 (en) * 1975-04-14 1976-10-28 Wilhelm Hepke Tree trunk bark removing machine - has spiral cutters the full length of tree trunk
DE2712985A1 (en) * 1977-03-24 1978-10-05 Wilhelm Hepke Revolving tree trunk stripper - has helically arranged angled paring bars overlapping for peripheral circulation

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Publication number Publication date
US4590979A (en) 1986-05-27
DE3472644D1 (en) 1988-08-18
IT1173595B (en) 1987-06-24
IT8420857A0 (en) 1984-05-09
CA1223177A (en) 1987-06-23
WO1984004485A1 (en) 1984-11-22
ATA171783A (en) 1984-10-15
AT377943B (en) 1985-05-28
EP0141831A1 (en) 1985-05-22
IT8420857A1 (en) 1985-11-09

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