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EP1109437A1 - Machine for grasping and lopping tree trunks - Google Patents

Machine for grasping and lopping tree trunks

Info

Publication number
EP1109437A1
EP1109437A1 EP99944174A EP99944174A EP1109437A1 EP 1109437 A1 EP1109437 A1 EP 1109437A1 EP 99944174 A EP99944174 A EP 99944174A EP 99944174 A EP99944174 A EP 99944174A EP 1109437 A1 EP1109437 A1 EP 1109437A1
Authority
EP
European Patent Office
Prior art keywords
knives
pair
movements
machine according
delimbing
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.)
Withdrawn
Application number
EP99944174A
Other languages
German (de)
French (fr)
Inventor
Alain-Michel Charlier
Joseph Huet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1109437A1 publication Critical patent/EP1109437A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G23/00—Forestry
    • A01G23/02—Transplanting, uprooting, felling or delimbing trees
    • A01G23/095—Delimbers
    • A01G23/097—Delimbers having a fixed delimbing head

Definitions

  • the present invention relates to the field of limbing of tree trunks.
  • a machine For the limbing of tree trunks, a machine is commonly used comprising two drive rollers used to grip the tree trunk in order to pass it through a system of knives ensuring the limbing of the tree trunk.
  • Known delimbing systems include pivoting curved knives which grip the trunk and remove the branches as the trunk scrolls.
  • the knives which are controlled independently of the rollers, are arranged in pairs, the knives of each pair closing around the trunk.
  • the object of the invention is to remedy this drawback and, to this end, it proposes an improved delimbing system which ensures a considerably increased delimbing yield.
  • a delimbing device comprising a first and a second pair of curved knives arranged to be able to move in a movement of closing and opening movement in two parallel planes and a fifth curved knife supported by the frame.
  • the knives of the second pair are connected to the respective knives of the first pair so that the movements of the knives of the two pairs are synchronized and that, when said first and second pairs of knives are closed, the five knives circumscribe a closed contour and are in practically maximum contact with the entire circumference of a tree trunk.
  • the knives of the second pair can be mounted to pivot between a first position in which they are retracted under the fifth fixed knife and a second position in which they partially overlap the knives of the first pair.
  • the moving tree trunk is optimally circumscribed by five knife blades also ensuring the centering of the trunk, and this for a wide range of trunk diameters .
  • the tree trunks have a conical shape and that their diameter varies over their entire length.
  • a second aspect of the invention relates to optimizing the inclination of the axis of the support arms of the drive rollers.
  • This optimization of the angle of inclination of the axes makes it possible to combine the opening of the support arms of the rollers, the formation between these rollers of a V all the more marked as the opening of the arms is large, which has the advantageous effect of allowing the rollers to take up a significant part of the weight of the wood and thus reducing the friction of the wood on the knives.
  • Figure 1 is an elevational front view of a machine comprising a delimbing device according to the invention
  • Figure 2 illustrates an alternative embodiment of the machine shown in Figure 1;
  • Figure 3 is a plan view of the delimbing device according to the invention
  • Figure 4 is a schematic perspective view of the device of Figure 3;
  • Figures 5 to 10 illustrate the closing movement of the knives in the limbing device of Figure 4;
  • Figure 11 shows a pair of bogie drive rollers
  • FIG. 12 is a diagram of a hydraulic circuit for clamping knives or rollers respectively.
  • Figure 13 is a diagram of an independent hydraulic circuit for driving wood by the rollers.
  • Figure 1 there are, mounted on a frame 10, two drive rollers 21 and 22, and a delimbing device 30 according to the invention.
  • Figure 2 shows a similar machine, but in which are mounted four drive rollers 21-24, the delimbing device 30 being the same as in Figure 1.
  • a trunk shaft is placed between the rollers 21 and 22 and these rollers drive the trunk and pass it through the delimbing device 30.
  • the drive rollers are supported by support arms 27, 28 articulated on axes 25 , 26 which are inclined with respect to a horizontal plane and inclined laterally with respect to the vertical median plane of the delimbing device 30.
  • the drive of the woods is carried out, on each side, by a pair of driving rollers 21 and 23 and respectively 22 and 24.
  • Each pair of rollers is mounted on a type of support bogie 54 and respectively 55.
  • Such a pair of rollers on a bogie is shown in perspective in FIG. 11.
  • Each bogie therefore supports two rollers whose axes are parallel and it is articulated on a support arm 56 or respectively 57 by means of an axis 58 or respectively 59.
  • Each of the bogies 54 and 55 thus have a possible rotational movement relative to the corresponding support arm.
  • the axis of rotation 58 or 59 is parallel to the axes of the corresponding rollers 21 and 23 or 22 and 24.
  • the support arms are, as illustrated in FIG. 1, articulated on inclined axes 25, 26.
  • Each roller may have a drive motor, not shown. It can also be provided as in FIG. 11 that only one roller 23 of each pair is driven and that the other is driven by the first by any suitable transmission means, for example a chain 61, represented schematically by a line. mixed, which engages in the cooperating teeth 62 and 63 carried by each of the rollers.
  • a suitable transmission means for example a chain 61, represented schematically by a line. mixed, which engages in the cooperating teeth 62 and 63 carried by each of the rollers.
  • the bogie can be oriented at any time in order to keep in contact the two rollers of each pair with the wood.
  • the clamping force is constantly divided between these two rollers and any obstacle encountered by a roller has its amplitude divided at the support arm.
  • each roller is therefore reduced with the effect of reducing the deterioration of the wood surface.
  • the tensile force of the rollers is practically doubled, which is important for non-linear trunks like those of hardwoods.
  • Figures 3 and 4 show in particular a delimbing device according to the invention.
  • Figure 3 shows a plan view of the device, in the open position
  • Figure 4 shows a schematic perspective view of this device in a partially closed position, circumscribing an opening having an average diameter.
  • the device according to the invention comprises five curved knives.
  • Two large knives 31 and 32 consist of two arms 33 and 34 having a boxed structure and carrying respectively two-edged blades 35 and 36.
  • the arms 33 and 34 are fixed on support tubes 37 and 38 intended to receive axes of rotation.
  • the arms 33 and 34 of the knives are interconnected by a connecting rod 39.
  • These large knives 33 and 34 are intended both for the operations of gripping the trunks and act like a gripping grapple, thus than delimbing operations.
  • the rod 39 acts crosswise between the knives and thus ensures the synchronization of their closing movements. It is thus impossible to close one knife without the other.
  • Two small knives 41 and 42 consist of two arms 43 and 44 carrying two blades with two cutting edges 45 and 46, the arms also being fixed on support tubes 47 and 48 intended to receive axes of rotation.
  • the arms 43 and 44 of these small knives are connected to the arms 33 and 34 of the large knives by connecting rods 51 and 52 so as to synchronize the closing movements of the small knives 41 and 42 with the closing movements of the large knives 31 and 32
  • the small knives 41 and 42 are arranged so that their arms move above the arms of the large knives 31 and 32.
  • the small knives 41 and 42 are used for delimbing operations.
  • a fifth curved knife 53 is frontal and fixed. It is fixed to the machine frame and extends over the small knives. The fixed knife 53 is used for delimbing operations.
  • the movements of the large and small knives, as well as the drive rollers are controlled by a control device not shown. Thanks to the synchronization of the small knives 41 and 42 with the large knives 31 and 32, the first always follow the movement of the large knives and this allows the five knives of the assembly to form, for delimbing operations, a closed contour around the trunk, thus circumscribing contours very close to the circle, but of different diameters as illustrated in Figures 5 to 10.
  • the large knives 31 and 32 are open and the small knives 41 and 42 are retracted below the fixed knife 53, transforming the device into a gripper where the large knives form a grapple used for loading wood ( Figures 5 and 6).
  • the large knives 31 and 32 are controlled to close, gradually driving the small knives, the cutting blades 43 and 44 of which are placed between the cutting blades 33 and 34 of the large knives and the front knife 53 ( Figures 7 to 10).
  • the closing of the swivel knives allows to circumscribe continuous contours of different diameters.
  • the arrangement according to the invention ensures that the cutting blades are always in maximum contact with the entire circumference of the tree trunk during the operations of lopping.
  • the axes of the support arms of the drive rollers are inclined.
  • the inclination of the axes 25-26 of the support arms of the drive rollers is optimized so as to allow the rollers not only to drive the tree trunks, but also to resume a significant part of the weight of the wood.
  • the axes of the support arms of the drive rollers are preferably inclined by approximately 76 e with respect to a horizontal plane and inclined laterally by approximately 5 ° with respect to the vertical median plane of the delimbing device 30. Thanks to this optimization, when they open, the rollers form between them a V all the more marked as the opening and therefore the diameter of the tree trunk are large.
  • the clamping force of the rollers is broken down into two distinct components: a horizontal component exerting the clamping and a vertical component which takes up a significant part of the weight of the wood.
  • the aforementioned optimized inclination has the effect of favoring the opening angle V of the rollers while minimizing the angle of shifting of the rollers. Thanks to the fact that the wood is thus carried by the rollers, the friction of the wood on the knives is greatly reduced, and this results in less loss of energy and an increase in the efficiency of the delimbing machine.
  • it is advantageous to provide at least two clamping circuits namely:
  • the hydraulic clamping pressures of these circuits are preferably to be adjusted, advantageously separately for each circuit and according to different parameters: diameter of the wood, essence of the wood, working phase (starting and stopping of the scrolling of the woods, etc.).
  • FIG. 12 a measurement management system has been illustrated which consists in using hydraulic valves of the open-closed type (ON / OFF) to vary the clamping pressure which, depending on the circuit, will be applied to the knives or the rollers .
  • the hydraulic line 70 of the illustrated circuit has a constant pressure or flow and is supplied from a source of hydraulic medium under current pressure, not shown. This line is connected to a closed-center valve 71 which communicates with hydraulic cylinders 72 and 73.
  • the pistons 74 and 75 of these cylinders make it possible to tighten or loosen the knives or rollers.
  • a hydraulic-gas accumulator 76 On the line joining the valve to the side allowing the tightening of the jacks is a hydraulic-gas accumulator 76 as well as a pressure measurement sensor 77, permanently informing an electronic unit, not shown, of the clamping pressure.
  • the electronic unit controls by a calibrated pulse the opening of the valve 71 which injects a small volume of oil in the circuit of tightening, the pressure increasing slightly while obeying the equations of behavior of the compressed gas in the accumulator.
  • the pressure is again measured and compared with the setpoint, and the control pulses follow each other if necessary. Conversely, a volume of oil is subtracted by the valve if the pressure is too high.
  • a hydraulic valve 79 can be placed on the line towards the accumulator in order to isolate it from certain moments.
  • the side opposite the tightening of the jacks is connected to the oil return so as not to impede the elastic functioning of the system, and this thanks to the nature of the valve 71 itself, or else by an additional valve 78.
  • the clamping of the drive rollers must meet a double requirement: a minimum clamping pressure is required in order to damage the surface of the woods to be driven to a minimum, but on the other hand, if the wood's driving force must increase (more important, heavy wood,), it is clear that a too low clamping pressure gives rise to slippage and therefore also to damage to the surface of the wood.
  • an independent hydraulic supply circuit for driving the wood can be supplied from a source of hydraulic medium under current pressure, not shown, which can be the same as that supplying the clamping circuits of the knives and rollers previously described.
  • the supply line 80 of the circuit is however independent of the supply line 71 of the clamping circuit shown in FIG. 12.
  • the supply circuit shown in FIG. 13 comprises for example a pressure sensor 81, which can measure the pressure necessary for driving the wood, and a supply valve 82 which supplies the drive motors 60 of the drive rollers.
  • the electronic unit permanently informed of the pressure measured by the sensor can, when it notices an increase in pressure, act on the set value of the clamping pressure of the drive rollers by the control device, and so , correct the tightening of the drive rollers and therefore their adhesion. It is therefore an anticipatory traction control system.
  • the embodiments described above are examples given by way of illustration only. Variants of execution and modifications can be made by those skilled in the art without departing from the spirit of the invention and without departing from the scope of the claims below.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)

Abstract

The invention concerns a machine for grasping and lopping tree trunks, comprising a frame, feed rollers for enclosing and move along the tree trunk, a lopping device comprising a pair of pivoting blades curved inwards (31, 32) to grasp the tree trunk and a device controlling the feed rollers and the lopping device, the lopping device further including a second pair of pivoting blades curved inwards (41, 42), and a fifth bent blade (53) supported by the frame. The invention is characterised in that the blades of the second pair (41, 42) are each linked to one particular blade of the first pair (31, 32) such that the movements of the blades of both pairs are synchronised and that, when said pairs of blades are closed, the five blades (31, 32, 41, 42, 53) circumscribe a closed contour and are practically in maximum contact with the tree trunk whole circumference.

Description

Machine pour prendre et ébrancher des troncs d'arbresMachine for taking and delimbing tree trunks
La présente invention se rapporte au domaine de l'ébran- chage de troncs d'arbres.The present invention relates to the field of limbing of tree trunks.
Pour l'ébranchage de troncs d'arbres, on utilise couramment une machine comprenant deux rouleaux d'entraînement servant à enserrer le tronc d'arbre afin de le faire défiler dans un système de couteaux assurant l'ébranchage du tronc d'arbre. Les systèmes d'ébranchage connus comprennent des couteaux incurvés pivotants qui saisissent le tronc et en éliminent les branches à mesure que le tronc défile. Les couteaux, qui sont contrôlés indépendamment des rouleaux, sont agencés par paires, les couteaux de chaque paire se refermant autour du tronc.For the limbing of tree trunks, a machine is commonly used comprising two drive rollers used to grip the tree trunk in order to pass it through a system of knives ensuring the limbing of the tree trunk. Known delimbing systems include pivoting curved knives which grip the trunk and remove the branches as the trunk scrolls. The knives, which are controlled independently of the rollers, are arranged in pairs, the knives of each pair closing around the trunk.
Avec ces systèmes d'ébranchage connus, l'ébranchage ne se fait que par deux couteaux refermés autour du tronc. Il est dès lors impossible, avec ces deux couteaux pivotants formant pince, de circonscrire parfaitement le tronc d'un arbre et ceci a pour conséquence que l'ébranchage obtenu est imparfait.With these known delimbing systems, delimbing is done only by two knives closed around the trunk. It is therefore impossible, with these two pivoting knives forming pliers, to perfectly circumscribe the trunk of a tree and this has the consequence that the limbing obtained is imperfect.
L'invention a pour but de remédier à cet inconvénient et, à cet effet, elle propose un système d'ébranchage perfectionné qui assure un rendement d'ébranchage considérablement accru.The object of the invention is to remedy this drawback and, to this end, it proposes an improved delimbing system which ensures a considerably increased delimbing yield.
Cet objectif est atteint suivant l'invention par un dispositif d'ébranchage comprenant une première et une deuxième paire de couteaux incurvés agencées pour pouvoir se déplacer en un mouvement de fermeture et un mouvement d'ouverture dans deux plans parallèles et un cinquième couteau cintré supporté par le bâti.This object is achieved according to the invention by a delimbing device comprising a first and a second pair of curved knives arranged to be able to move in a movement of closing and opening movement in two parallel planes and a fifth curved knife supported by the frame.
Les couteaux de la deuxième paire sont reliés aux couteaux respectifs de la première paire de manière que les mouvements des couteaux des deux paires soient synchronisés et que, lorsque lesdites première et deuxième paires de couteaux sont refermées, les cinq couteaux circonscrivent un contour fermé et soient en contact pratiquement maximum avec toute la circonférence d'un tronc d'arbre.The knives of the second pair are connected to the respective knives of the first pair so that the movements of the knives of the two pairs are synchronized and that, when said first and second pairs of knives are closed, the five knives circumscribe a closed contour and are in practically maximum contact with the entire circumference of a tree trunk.
Les couteaux de la deuxième paire peuvent être montés pour pivoter entre une première position dans laquelle ils se trouvent escamotés sous le cinquième couteau fixe et une deuxième position dans laquelle ils chevauchent partiellement les couteaux de la première paire.The knives of the second pair can be mounted to pivot between a first position in which they are retracted under the fifth fixed knife and a second position in which they partially overlap the knives of the first pair.
Grâce à l'agencement des lames de couteaux suivant l'invention, le tronc d'arbre qui défile se trouve circonscrit de manière optimale par cinq lames de couteaux assurant par ailleurs le centrage du tronc, et cela pour une gamme large de diamètres des troncs. Il faut noter que les troncs d'arbres ont une forme conique et que leur diamètre varie sur toute leur longueur.Thanks to the arrangement of knife blades according to the invention, the moving tree trunk is optimally circumscribed by five knife blades also ensuring the centering of the trunk, and this for a wide range of trunk diameters . It should be noted that the tree trunks have a conical shape and that their diameter varies over their entire length.
Un second aspect de l'invention concerne l'optimisation de l'inclinaison de l'axe des bras de support des rouleaux d'entraînement. Cette optimisation de l'angle d'inclinaison des axes permet de combiner à l'ouverture des bras de support des rouleaux, la formation entre ces rouleaux d'un V d'autant plus marqué que l'ouverture des bras est importante, ce qui a pour effet avantageux de permettre aux rouleaux de reprendre une partie importante du poids du bois et de réduire ainsi le frottement du bois sur les couteaux.A second aspect of the invention relates to optimizing the inclination of the axis of the support arms of the drive rollers. This optimization of the angle of inclination of the axes makes it possible to combine the opening of the support arms of the rollers, the formation between these rollers of a V all the more marked as the opening of the arms is large, which has the advantageous effect of allowing the rollers to take up a significant part of the weight of the wood and thus reducing the friction of the wood on the knives.
D'autres détails et particularités de la machine pour prendre et ébrancher des troncs d'arbres et du dispositif d'ébranchage suivant l'invention sont indiqués dans les revendications. L'invention est exposée plus en détail dans ce qui suit à l'aide des dessins ci-joints.Other details and particularities of the machine for picking up and delimbing tree trunks and of the delimbing device according to the invention are indicated in the claims. The invention is explained in more detail below with the aid of the attached drawings.
La figure 1 est une vue en élévation, de face, d'une machine comprenant un dispositif d'ébranchage suivant l'invention; La figure 2 illustre une variante d'exécution de la machine montrée en figure 1 ;Figure 1 is an elevational front view of a machine comprising a delimbing device according to the invention; Figure 2 illustrates an alternative embodiment of the machine shown in Figure 1;
La figure 3 est une vue en plan du dispositif d'ébranchage suivant l'invention; La figure 4 est une vue en perspective schématique du dispositif de la figure 3;Figure 3 is a plan view of the delimbing device according to the invention; Figure 4 is a schematic perspective view of the device of Figure 3;
Les figures 5 à 10 illustrent le mouvement de fermeture des couteaux dans le dispositif d'ébranchage de la figure 4;Figures 5 to 10 illustrate the closing movement of the knives in the limbing device of Figure 4;
La figure 11 représente une paire de rouleaux d'entraînement sur bogie;Figure 11 shows a pair of bogie drive rollers;
La figure 12 est un schéma d'un circuit hydraulique de serrage de couteaux ou respectivement de rouleaux;FIG. 12 is a diagram of a hydraulic circuit for clamping knives or rollers respectively;
La figure 13 est un schéma d'un circuit hydraulique indépendant pour l'entraînement du bois par les rouleaux. Sur la figure 1 , on distingue, montés sur un bâti 10, deux rouleaux d'entraînement 21 et 22, et un dispositif d'ébranchage 30 suivant l'invention. La figure 2 représente une machine similaire, mais dans laquelle sont montés quatre rouleaux d'entraînement 21-24, le dispositif d'ébranchage 30 étant le même que sur la figure 1. Dans une machine telle que représentée à la figure 1 , un tronc d'arbre vient se placer entre les rouleaux 21 et 22 et ces rouleaux entraînent le tronc et le font défiler dans le dispositif d'ébranchage 30. Les rouleaux d'entraînement sont supportés par des bras de support 27, 28 articulés sur des axes 25, 26 qui sont inclinés par rapport à un plan horizontal et inclinés latéralement par rapport au plan médian vertical du dispositif d'ébranchage 30.Figure 13 is a diagram of an independent hydraulic circuit for driving wood by the rollers. In Figure 1, there are, mounted on a frame 10, two drive rollers 21 and 22, and a delimbing device 30 according to the invention. Figure 2 shows a similar machine, but in which are mounted four drive rollers 21-24, the delimbing device 30 being the same as in Figure 1. In a machine as shown in Figure 1, a trunk shaft is placed between the rollers 21 and 22 and these rollers drive the trunk and pass it through the delimbing device 30. The drive rollers are supported by support arms 27, 28 articulated on axes 25 , 26 which are inclined with respect to a horizontal plane and inclined laterally with respect to the vertical median plane of the delimbing device 30.
Dans l'exemple de réalisation représenté sur la figure 2, l'entraînement des bois est réalisé, de chaque côté, par une paire de rouleaux entraîneurs 21 et 23 et respectivement 22 et 24. Chaque paire de rouleaux est montée sur un support de type bogie 54 et respectivement 55. Une telle paire de rouleaux sur bogie est représentée en perspective sur la figure 11.In the embodiment shown in Figure 2, the drive of the woods is carried out, on each side, by a pair of driving rollers 21 and 23 and respectively 22 and 24. Each pair of rollers is mounted on a type of support bogie 54 and respectively 55. Such a pair of rollers on a bogie is shown in perspective in FIG. 11.
Chaque bogie supporte donc deux rouleaux dont les axes sont parallèles et il est articulé sur un bras de support 56 ou respectivement 57 par l'intermédiaire d'un axe 58 ou respectivement 59. Chacun des bogies 54 et 55 dispose ainsi d'un mouvement de rotation possible par rapport au bras de support correspondant. L'axe de rotation 58 ou 59 est parallèle aux axes des rouleaux correspondants 21 et 23 ou 22 et 24. Les bras de support sont, comme illustré sur la figure 1 , articulés sur des axes inclinés 25, 26.Each bogie therefore supports two rollers whose axes are parallel and it is articulated on a support arm 56 or respectively 57 by means of an axis 58 or respectively 59. Each of the bogies 54 and 55 thus have a possible rotational movement relative to the corresponding support arm. The axis of rotation 58 or 59 is parallel to the axes of the corresponding rollers 21 and 23 or 22 and 24. The support arms are, as illustrated in FIG. 1, articulated on inclined axes 25, 26.
Chaque rouleau peut disposer d'un moteur d'entraînement non représenté. On peut aussi prévoir comme sur la figure 11 qu'un seul rouleau 23 de chaque paire soit entraîné et que l'autre soit entraîné par le premier par tout moyen de transmission approprié, par exemple une chaîne 61 , représentée de manière schématique par un trait mixte, qui entre en prise dans les dentures coopérantes 62 et 63 portées par chacun des rouleaux.Each roller may have a drive motor, not shown. It can also be provided as in FIG. 11 that only one roller 23 of each pair is driven and that the other is driven by the first by any suitable transmission means, for example a chain 61, represented schematically by a line. mixed, which engages in the cooperating teeth 62 and 63 carried by each of the rollers.
Par cette géométrie et son axe de liberté, le bogie peut à tout instant s'orienter afin de garder en contact les deux rouleaux de chaque paire avec le bois. De plus, la force de serrage est constamment divisée entre ces deux rouleaux et tout obstacle rencontré par un rouleau voit son amplitude divisée au niveau du bras de support.By this geometry and its axis of freedom, the bogie can be oriented at any time in order to keep in contact the two rollers of each pair with the wood. In addition, the clamping force is constantly divided between these two rollers and any obstacle encountered by a roller has its amplitude divided at the support arm.
La pression de serrage de chaque rouleau est donc réduite avec pour effet une diminution de la détérioration de la surface du bois. A pression de serrage égale, la force de traction des rouleaux est pratiquement doublée, ce qui est important pour des troncs non linéaires, comme ceux des feuillus.The clamping pressure of each roller is therefore reduced with the effect of reducing the deterioration of the wood surface. At equal clamping pressure, the tensile force of the rollers is practically doubled, which is important for non-linear trunks like those of hardwoods.
Les figures 3 et 4 représentent en particulier un dispositif d'ébranchage suivant l'invention. La figure 3 montre une vue en plan du dispositif, en position ouverte, la figure 4 montre une vue en perspective schématique de ce dispositif dans une position partiellement refermée, circonscrivant une ouverture ayant un diamètre moyen. Le dispositif suivant l'invention comprend cinq couteaux incurvés. Deux grands couteaux 31 et 32 sont constitués de deux bras 33 et 34 ayant une structure caissonnée et portant respectivement des lames à deux tranchants 35 et 36. Les bras 33 et 34 sont fixés sur des tubes de soutien 37 et 38 destinés à recevoir des axes de rotation. Les bras 33 et 34 des couteaux sont reliés entre eux par une bielle 39. Ces grands couteaux 33 et 34 sont destinés à la fois aux opérations de prise des troncs et agissent tel un grappin de prise, ainsi qu'aux opérations d'ébranchage. La bielle 39 agit de manière croisée entre les couteaux et assure ainsi la synchronisation de leurs mouvements de fermeture. Il est ainsi impossible de refermer un couteau sans l'autre.Figures 3 and 4 show in particular a delimbing device according to the invention. Figure 3 shows a plan view of the device, in the open position, Figure 4 shows a schematic perspective view of this device in a partially closed position, circumscribing an opening having an average diameter. The device according to the invention comprises five curved knives. Two large knives 31 and 32 consist of two arms 33 and 34 having a boxed structure and carrying respectively two-edged blades 35 and 36. The arms 33 and 34 are fixed on support tubes 37 and 38 intended to receive axes of rotation. The arms 33 and 34 of the knives are interconnected by a connecting rod 39. These large knives 33 and 34 are intended both for the operations of gripping the trunks and act like a gripping grapple, thus than delimbing operations. The rod 39 acts crosswise between the knives and thus ensures the synchronization of their closing movements. It is thus impossible to close one knife without the other.
Deux petits couteaux 41 et 42 sont constitués de deux bras 43 et 44 portant deux lames à deux tranchants 45 et 46, les bras étant également fixés sur des tubes de soutien 47 et 48 destinés à recevoir des axes de rotation. Les bras 43 et 44 de ces petits couteaux sont reliés aux bras 33 et 34 des grands couteaux par des bielles 51 et 52 de manière à synchroniser les mouvements de fermeture des petits couteaux 41 et 42 avec les mouvements de fermeture des grands couteaux 31 et 32. Les petits couteaux 41 et 42 sont agencés de manière que leurs bras se déplacent au-dessus des bras des grands couteaux 31 et 32. Les petits couteaux 41 et 42 servent aux opérations d'ébranchage.Two small knives 41 and 42 consist of two arms 43 and 44 carrying two blades with two cutting edges 45 and 46, the arms also being fixed on support tubes 47 and 48 intended to receive axes of rotation. The arms 43 and 44 of these small knives are connected to the arms 33 and 34 of the large knives by connecting rods 51 and 52 so as to synchronize the closing movements of the small knives 41 and 42 with the closing movements of the large knives 31 and 32 The small knives 41 and 42 are arranged so that their arms move above the arms of the large knives 31 and 32. The small knives 41 and 42 are used for delimbing operations.
Un cinquième couteau cintré 53 est frontal et fixe. Il se trouve fixé au bâti de la machine et s'étend au-dessus des petits couteaux. Le couteau fixe 53 sert aux opérations d'ébranchage.A fifth curved knife 53 is frontal and fixed. It is fixed to the machine frame and extends over the small knives. The fixed knife 53 is used for delimbing operations.
Les mouvements des grands et petits couteaux, ainsi que des rouleaux d'entraînement sont pilotés par un dispositif de commande non représenté. Grâce à la synchronisation des petits couteaux 41 et 42 avec les grands couteaux 31 et 32, les premiers suivent toujours le mouvement des grands couteaux et ceci permet aux cinq couteaux de l'ensemble de former, pour les opérations d'ébranchage, un contour fermé autour du tronc, circonscrivant ainsi des contours très proches du cercle, mais de différents diamètres ainsi que l'illustrent les figures 5 à 10.The movements of the large and small knives, as well as the drive rollers are controlled by a control device not shown. Thanks to the synchronization of the small knives 41 and 42 with the large knives 31 and 32, the first always follow the movement of the large knives and this allows the five knives of the assembly to form, for delimbing operations, a closed contour around the trunk, thus circumscribing contours very close to the circle, but of different diameters as illustrated in Figures 5 to 10.
Pour les opérations de prise des bois, les grands couteaux 31 et 32 sont ouverts et les petits couteaux 41 et 42 se trouvent escamotés en dessous du couteau fixe 53, transformant le dispositif en une pince de prise où les grands couteaux forment un grappin servant au chargement des bois (figures 5 et 6).For wood-taking operations, the large knives 31 and 32 are open and the small knives 41 and 42 are retracted below the fixed knife 53, transforming the device into a gripper where the large knives form a grapple used for loading wood (Figures 5 and 6).
Lors des opérations d'ébranchage, les grands couteaux 31 et 32 sont pilotés pour se refermer, entraînant progressivement les petits couteaux dont les lames coupantes 43 et 44 viennent se place entre les lames coupantes 33 et 34 des grands couteaux et le couteau frontal 53 (figures 7 à 10). La fermeture des couteaux pivotants permet de circonscrire des contours continus de diamètres différents.During limbing operations, the large knives 31 and 32 are controlled to close, gradually driving the small knives, the cutting blades 43 and 44 of which are placed between the cutting blades 33 and 34 of the large knives and the front knife 53 (Figures 7 to 10). The closing of the swivel knives allows to circumscribe continuous contours of different diameters.
Grâce à une optimisation des profils des lames coupantes 33, 34, 43, 44 et 53, l'agencement suivant l'invention assure que les lames coupantes se trouvent toujours en contact maximum avec toute la circonférence du tronc d'arbre pendant les opérations d'ébranchage.By optimizing the profiles of the cutting blades 33, 34, 43, 44 and 53, the arrangement according to the invention ensures that the cutting blades are always in maximum contact with the entire circumference of the tree trunk during the operations of lopping.
Il est à souligner que par la synchronisation des mouvements des petits et grands couteaux à l'aide de bielles (et non par un système hydraulique), les petits couteaux n'exercent aucune force de poussée sur le tronc, ce qui évite les frottements du tronc sur les couteaux et dès lors, en évitant la perte d'énergie qui en résulterait, améliore le rendement d'ébranchage.It should be noted that by synchronizing the movements of small and large knives using connecting rods (and not by a hydraulic system), the small knives exert no pushing force on the trunk, which prevents friction from the trunk on the knives and therefore, by avoiding the loss of energy which would result therefrom, improves the delimbing yield.
Il a été indiqué plus haut que les axes des bras de support des rouleaux d'entraînement sont inclinés. Conformément à un aspect complémentaire de l'invention, l'inclinaison des axes 25-26 des bras de support des rouleaux d'entraînement est optimisée de manière à permettre aux rouleaux non seulement d'entraîner les troncs d'arbres, mais également de reprendre une partie significative du poids du bois. A cet effet, les axes des bras de support des rouleaux d'entraînement sont de préférence inclinés de 76e environ par rapport à un plan horizontal et inclinés latéralement de 5° environ par rapport au plan médian vertical du dispositif d'ébranchage 30. Grâce à cette optimisation, lorsqu'ils s'ouvrent, les rouleaux forment entre eux un V d'autant plus marqué que l'ouverture et dès lors le diamètre du tronc d'arbre sont grands. La force de serrage des rouleaux se décompose en deux composantes distinctes : une composante horizontale exerçant le serrage et une composante verticale qui reprend une partie importante du poids du bois. L'inclinaison optimisée précitée a pour effet de privilégier l'angle d'ouverture V des rouleaux tout en minimisant l'angle de ripage des rouleaux. Grâce au fait que le bois est ainsi porté par les rouleaux le frottement du bois sur les couteaux se trouve fortement réduit, et il en résulte une moindre perte d'énergie et une augmentation du rendement de la machine d'ébranchage. Sur une machine suivant l'invention, il est avantageux de prévoir au moins deux circuits de serrage, à savoir :It has been indicated above that the axes of the support arms of the drive rollers are inclined. In accordance with a complementary aspect of the invention, the inclination of the axes 25-26 of the support arms of the drive rollers is optimized so as to allow the rollers not only to drive the tree trunks, but also to resume a significant part of the weight of the wood. For this purpose, the axes of the support arms of the drive rollers are preferably inclined by approximately 76 e with respect to a horizontal plane and inclined laterally by approximately 5 ° with respect to the vertical median plane of the delimbing device 30. Thanks to this optimization, when they open, the rollers form between them a V all the more marked as the opening and therefore the diameter of the tree trunk are large. The clamping force of the rollers is broken down into two distinct components: a horizontal component exerting the clamping and a vertical component which takes up a significant part of the weight of the wood. The aforementioned optimized inclination has the effect of favoring the opening angle V of the rollers while minimizing the angle of shifting of the rollers. Thanks to the fact that the wood is thus carried by the rollers, the friction of the wood on the knives is greatly reduced, and this results in less loss of energy and an increase in the efficiency of the delimbing machine. On a machine according to the invention, it is advantageous to provide at least two clamping circuits, namely:
- le serrage des bras de support 27, 28 ou respectivement 56, 57, et donc des rouleaux d'entraînement, ces rouleaux ayant pour fonction principale l'entraînement des bois, mais également, en conséquence de l'ouverture en V des rouleaux d'entraînement, le soutien du bois, et- The tightening of the support arms 27, 28 or respectively 56, 57, and therefore of the drive rollers, these rollers having the main function of driving the woods, but also, as a result of the V-shaped opening of the rollers d , wood support, and
- le serrage des couteaux, dont la fonction principale est l'ébranchage, la fonction de soutien des couteaux étant minime.- the tightening of the knives, whose main function is delimbing, the support function of the knives being minimal.
Les pressions hydrauliques de serrage de ces circuits sont de préférence à ajuster, avantageusement séparément pour chaque circuit et en fonction de différents paramètres : diamètre du bois, essence du bois, phase de travail (démarrage et arrêt du défilement des bois, etc.).The hydraulic clamping pressures of these circuits are preferably to be adjusted, advantageously separately for each circuit and according to different parameters: diameter of the wood, essence of the wood, working phase (starting and stopping of the scrolling of the woods, etc.).
Sur la figure 12, on a illustré un système de gestion de mesure consistant à utiliser des vannes hydrauliques de type ouvert-fermé (ON/OFF) pour faire varier la pression de serrage qui, selon le circuit, sera appliquée aux couteaux ou aux rouleaux. La ligne hydraulique 70 du circuit illustré présente une pression ou un débit constant et est alimentée depuis une source de milieu hydraulique sous pression courante, non représentée. Cette ligne est reliée à une vanne 71 à centre fermé qui communique avec des vérins hydrauliques 72 et 73. Les pistons 74 et 75 de ces vérins permettent de serrer ou desserrer les couteaux ou rouleaux. Sur la ligne réunissant la vanne au côté permettant le serrage des vérins se trouve un accumulateur hydraulique-gaz 76 ainsi qu'un capteur de mesure de pression 77, informant en permanence un boîtier électronique non représenté de la pression de serrage. Lorsque la pression mesurée est inférieure à la pression désirée, c'est-à-dire une valeur de consigne, le boîtier électronique commande par une impulsion calibrée l'ouverture de la vanne 71 qui injecte un faible volume d'huile dans le circuit de serrage, la pression augmentant légèrement en obéissant aux équations de comportement du gaz comprimé dans l'accumulateur. La pression est à nouveau mesurée et comparée à la valeur de consigne, et les impulsions de commande se succèdent si nécessaire. A l'inverse, un volume d'huile est soustrait par la vanne si la pression est trop élevée. Accessoirement, un clapet hydraulique 79 peut être placé sur la ligne vers l'accumulateur afin de l'isoler à certains moments. De même, le côté opposé au serrage des vérins est relié au retour d'huile afin de ne pas entraver le fonctionnement élastique du système et cela grâce à la nature de la vanne 71 elle-même, ou bien par un clapet additionnel 78. Le serrage des rouleaux d'entraînement doit répondre à une double exigence : une pression de serrage minimale est demandée afin d'endommager au minimum la surface des bois à entraîner, mais par contre, si la force d'entraînement du bois doit augmenter (branches plus importantes, bois lourd, ), il est clair qu'une pression de serrage trop faible donne lieu à un patinage et donc aussi à un endommagement de la surface du bois.In FIG. 12, a measurement management system has been illustrated which consists in using hydraulic valves of the open-closed type (ON / OFF) to vary the clamping pressure which, depending on the circuit, will be applied to the knives or the rollers . The hydraulic line 70 of the illustrated circuit has a constant pressure or flow and is supplied from a source of hydraulic medium under current pressure, not shown. This line is connected to a closed-center valve 71 which communicates with hydraulic cylinders 72 and 73. The pistons 74 and 75 of these cylinders make it possible to tighten or loosen the knives or rollers. On the line joining the valve to the side allowing the tightening of the jacks is a hydraulic-gas accumulator 76 as well as a pressure measurement sensor 77, permanently informing an electronic unit, not shown, of the clamping pressure. When the pressure measured is lower than the desired pressure, that is to say a set value, the electronic unit controls by a calibrated pulse the opening of the valve 71 which injects a small volume of oil in the circuit of tightening, the pressure increasing slightly while obeying the equations of behavior of the compressed gas in the accumulator. The pressure is again measured and compared with the setpoint, and the control pulses follow each other if necessary. Conversely, a volume of oil is subtracted by the valve if the pressure is too high. Incidentally, a hydraulic valve 79 can be placed on the line towards the accumulator in order to isolate it from certain moments. Likewise, the side opposite the tightening of the jacks is connected to the oil return so as not to impede the elastic functioning of the system, and this thanks to the nature of the valve 71 itself, or else by an additional valve 78. The clamping of the drive rollers must meet a double requirement: a minimum clamping pressure is required in order to damage the surface of the woods to be driven to a minimum, but on the other hand, if the wood's driving force must increase (more important, heavy wood,), it is clear that a too low clamping pressure gives rise to slippage and therefore also to damage to the surface of the wood.
Dans la machine suivant l'invention, il est avantageux de prévoir un circuit d'alimentation hydraulique indépendant pour l'entraînement du bois. Ce circuit peut être alimenté depuis une source de milieu hydraulique sous pression courante, non représentée, qui peut être la même que celle alimentant les circuits de serrage des couteaux et des rouleaux précédemment décrits. La ligne d'alimentation 80 du circuit est toutefois indépendante de la ligne d'alimentation 71 du circuit de serrage représenté sur la figure 12. Le circuit d'alimentation représenté sur la figure 13 comporte par exemple un capteur de pression 81 , qui peut mesurer la pression nécessaire à l'entraînement du bois, et une vanne d'alimentation 82 qui permet d'alimenter les moteurs d'entraînement 60 des rouleaux d'entraînement. Le boîtier électronique informé en permanence de la pression mesurée par le capteur peut, lorsqu'il constate une augmentation de pression, agir sur la valeur de consigne de la pression de serrage des rouleaux d'entraînement par le dispositif de commande, et de la sorte, corriger le serrage des rouleaux d'entraînement et donc leur adhérence. Il s'agit donc d'un système antipatinage anticipatif. Les modes de réalisation décrits ci-avant sont des exemples donnés à titre illustratif seulement. Des variantes d'exécution et des modifications peuvent y être apportées par l'homme de l'art sans s'écarter de l'esprit de l'invention et sans sortir de la portée des revendications ci-après. In the machine according to the invention, it is advantageous to provide an independent hydraulic supply circuit for driving the wood. This circuit can be supplied from a source of hydraulic medium under current pressure, not shown, which can be the same as that supplying the clamping circuits of the knives and rollers previously described. The supply line 80 of the circuit is however independent of the supply line 71 of the clamping circuit shown in FIG. 12. The supply circuit shown in FIG. 13 comprises for example a pressure sensor 81, which can measure the pressure necessary for driving the wood, and a supply valve 82 which supplies the drive motors 60 of the drive rollers. The electronic unit permanently informed of the pressure measured by the sensor can, when it notices an increase in pressure, act on the set value of the clamping pressure of the drive rollers by the control device, and so , correct the tightening of the drive rollers and therefore their adhesion. It is therefore an anticipatory traction control system. The embodiments described above are examples given by way of illustration only. Variants of execution and modifications can be made by those skilled in the art without departing from the spirit of the invention and without departing from the scope of the claims below.

Claims

R E V E N D I C A T I O N S
1.- Machine pour prendre et ébrancher des troncs d'arbres, comprenant un bâti (10), des rouleaux d'entraînement (21 , 22, 23, 24) pour enserrer et faire défiler un tronc d'arbre, un dispositif d'ébranchage (30) comportant une paire de couteaux incurvés pivotants (31, 32) pour saisir le tronc d'arbre et un dispositif de commande pour les rouleaux d'entraînement et le dispositif d'ébranchage, caractérisée en ce que le dispositif d'ébranchage (30) comprend, en outre, une deuxième paire de couteaux incurvés pivotants (41 , 42), et un cinquième couteau cintré (53) supporté par le bâti, les couteaux de la deuxième paire (41 , 42) étant reliés aux couteaux respectifs de la première paire (31 , 32), de manière que les mouvements des couteaux des deux paires soient synchronisés et que, lorsque lesdites paires de couteaux sont refermées, les cinq couteaux (31, 32, 41 , 42, 53) circonscrivent un contour fermé et soient en contact pratiquement maximum avec toute la circonférence du tronc d'arbre.1.- Machine for taking and delimbing tree trunks, comprising a frame (10), drive rollers (21, 22, 23, 24) for gripping and scrolling a tree trunk, a device for delimbing (30) comprising a pair of pivoting curved knives (31, 32) for gripping the tree trunk and a control device for the drive rollers and the delimbing device, characterized in that the delimbing device (30) further comprises a second pair of pivoting curved knives (41, 42), and a fifth curved knife (53) supported by the frame, the knives of the second pair (41, 42) being connected to the respective knives of the first pair (31, 32), so that the movements of the knives of the two pairs are synchronized and that, when said pairs of knives are closed, the five knives (31, 32, 41, 42, 53) circumscribe a contour closed and are in practically maximum contact with the entire circumf erence of the tree trunk.
2.- Machine suivant la revendication 1 , caractérisée en ce que le cinquième couteau (53) est supporté de manière fixe au bâti et en ce que les couteaux de la deuxième paire (41 , 42) sont montés pour pivoter entre une première position dans laquelle ils se trouvent escamotés sous le cinquième couteau (53) et une deuxième position dans laquelle ils chevauchent partiellement les couteaux de la première paire (31 , 32).2.- Machine according to claim 1, characterized in that the fifth knife (53) is fixedly supported on the frame and in that the knives of the second pair (41, 42) are mounted to pivot between a first position in which they are retracted under the fifth knife (53) and a second position in which they partially overlap the knives of the first pair (31, 32).
3.- Machine suivant l'une ou l'autre des revendications 1 et 2, caractérisée en ce que les couteaux de la première paire (31 , 32) sont reliés entre eux par une bielle (39) de manière à synchroniser leurs mouvements.3.- Machine according to either of claims 1 and 2, characterized in that the knives of the first pair (31, 32) are interconnected by a connecting rod (39) so as to synchronize their movements.
4.- Machine suivant la revendication 3, caractérisée en ce que les couteaux de la deuxième paire (41 , 42) sont reliés aux couteaux respectifs (31 , 32) de la première paire par des bielles (51 , 52), de manière que les mouvements des couteaux de la deuxième paire (41 , 42) soient synchronisés avec les mouvements des couteaux de la première paire (31 , 32). 4.- Machine according to claim 3, characterized in that the knives of the second pair (41, 42) are connected to the respective knives (31, 32) of the first pair by connecting rods (51, 52), so that the movements of the knives of the second pair (41, 42) are synchronized with the movements of the knives of the first pair (31, 32).
5.- Machine suivant l'une quelconque des revendications précédentes, caractérisée en ce que les couteaux de la première paire (31 , 32) sont constitués chacun d'un bras à structure caissonnée (33, 34) portant une lame incurvée à deux tranchants (35, 36). 5.- Machine according to any one of the preceding claims, characterized in that the knives of the first pair (31, 32) each consist of an arm with a boxed structure (33, 34) carrying a curved blade with two cutting edges (35, 36).
6.- Machine suivant l'une quelconque des revendications précédentes, caractérisée en ce que les rouleaux d'entraînement sont au nombre de une ou plusieurs paires.6.- Machine according to any one of the preceding claims, characterized in that the drive rollers are one or more in number.
7.- Machine suivant l'une quelconque des revendications précédentes, caractérisée en ce que les rouleaux d'entraînement sont supportés sur des bras de support articulés sur des axes (25, 26) inclinés de 76° environ par rapport à un plan horizontal et de 5° environ latéralement par rapport au plan médian vertical du dispositif d'ébranchage.7.- Machine according to any one of the preceding claims, characterized in that the drive rollers are supported on support arms articulated on axes (25, 26) inclined by approximately 76 ° relative to a horizontal plane and about 5 ° laterally from the vertical median plane of the delimbing device.
8.- Machine suivant la revendication 6, caractérisée en ce qu'elle comprend deux paires de rouleaux d'entraînement, chaque paire de rouleaux étant supportée sur un support conjoint (54, 55) qui est fixé de manière à pouvoir pivoter sur un bras de support articulé sur le bâti de la machine.8.- Machine according to claim 6, characterized in that it comprises two pairs of drive rollers, each pair of rollers being supported on a joint support (54, 55) which is fixed so as to be able to pivot on an arm support articulated on the machine frame.
9.- Machine suivant l'une des revendications précédentes, caractérisée en ce qu'elle comprend un circuit hydraulique de serrage des couteaux et un circuit hydraulique de serrage des rouleaux d'entraînement qui sont ajustables et sont indépendants l'un de l'autre.9. Machine according to one of the preceding claims, characterized in that it comprises a hydraulic circuit for clamping the knives and a hydraulic circuit for clamping the drive rollers which are adjustable and are independent of one another. .
10.- Machine suivant la revendication 9, caractérisée en ce que chaque circuit hydraulique de serrage comprend au moins une vanne hydraulique de type ouvert-fermé (ON/OFF), un accumulateur hydraulique à gaz (76) et un capteur de pression (77) informant le dispositif de commande des pressions de serrage dans le circuit et au moins un vérin (72, 73) hydraulique pour l'actionnement des couteaux ou respectivement rouleaux, ladite au moins une vanne étant ouverte ou fermée par des impulsions données par le dispositif de commande en fonction d'une comparaison entre valeurs de pression de serrage captées et une valeur de consigne.10.- Machine according to claim 9, characterized in that each hydraulic clamping circuit comprises at least one open-closed type hydraulic valve (ON / OFF), a hydraulic gas accumulator (76) and a pressure sensor (77 ) informing the control device of the clamping pressures in the circuit and at least one hydraulic cylinder (72, 73) for actuating the knives or rollers respectively, said at least one valve being opened or closed by pulses given by the device based on a comparison between the clamping pressure values sensed and a setpoint.
11.- Machine suivant l'une ou l'autre des revendications 9 et 10, caractérisée en ce qu'elle comprend un circuit hydraulique d'alimentation de moteurs (60) entraînant en rotation les rouleaux d'entraînement, qui est indépendant desdits circuits hydrauliques de serrage, et des moyens de mesure et d'ajustement (81 , 82) d'une pression qui règne dans ledit circuit hydraulique d'alimentation en fonction d'une force nécessaire à l'entraînement dudit tronc d'arbre.11.- Machine according to either of Claims 9 and 10, characterized in that it comprises a hydraulic circuit for supplying motors (60) driving the drive rollers in rotation, which is independent of said circuits hydraulic clamping, and means measuring and adjusting (81, 82) a pressure prevailing in said hydraulic supply circuit as a function of a force necessary for driving said tree trunk.
12.- Dispositif d'ébranchage, caractérisé en ce qu'il comprend une première paire de couteaux incurvés (31 , 32) montés pour pivoter autour d'axes respectifs de manière à saisir un tronc d'arbre, une deuxième paire de couteaux incurvés pivotants (41 , 42) et un cinquième couteau cintré (53), les couteaux de la deuxième paire (41 , 42) étant montés pour pivoter entre une première position dans laquelle ils se trouvent escamotés sous le cinquième couteau fixe (53) et une deuxième position dans laquelle ils chevauchent partiellement les couteaux de la première paire (31 , 32), les couteaux de la deuxième paire (41 , 42) étant reliés aux couteaux respectifs de la première paire (31 , 32), de manière que les mouvements des couteaux des deux paires soient synchronisés et que, lorsque lesdites paires de couteaux sont refermées, les cinq couteaux (31 , 32, 41 , 42, 53) circonscrivent un contour fermé et soient en contact pratiquement maximum avec toute la circonférence du tronc d'arbre, et un dispositif de commande pour entraîner les paires de couteaux dans des mouvements de fermeture et d'ouverture.12.- Delimbing device, characterized in that it comprises a first pair of curved knives (31, 32) mounted to pivot around respective axes so as to grip a tree trunk, a second pair of curved knives swivels (41, 42) and a fifth curved knife (53), the knives of the second pair (41, 42) being mounted to pivot between a first position in which they are retracted under the fifth fixed knife (53) and a second position in which they partially overlap the knives of the first pair (31, 32), the knives of the second pair (41, 42) being connected to the respective knives of the first pair (31, 32), so that the movements knives of the two pairs are synchronized and that, when said pairs of knives are closed, the five knives (31, 32, 41, 42, 53) define a closed contour and are in practically maximum contact with the entire circumference of the tree trunk, and a control device for driving the pairs of knives in closing and opening movements.
13.- Dispositif suivant la revendication 12, caractérisé en ce que les couteaux de la première paire (31, 32) sont reliés entre eux par une bielle (39) de manière à synchroniser leurs mouvements.13.- Device according to claim 12, characterized in that the knives of the first pair (31, 32) are interconnected by a connecting rod (39) so as to synchronize their movements.
14.- Dispositif suivant la revendication 13, caractérisé en ce que les couteaux de la deuxième paire (41 , 42) sont reliés aux couteaux respectifs (31 , 32) de la première paire par des bielles (51 , 52), de manière que les mouvements des couteaux de la deuxième paire (41 , 42) soient synchronisés avec les mouvements des couteaux de la première paire (31 , 32). 14.- Device according to claim 13, characterized in that the knives of the second pair (41, 42) are connected to the respective knives (31, 32) of the first pair by connecting rods (51, 52), so that the movements of the knives of the second pair (41, 42) are synchronized with the movements of the knives of the first pair (31, 32).
EP99944174A 1998-09-03 1999-09-03 Machine for grasping and lopping tree trunks Withdrawn EP1109437A1 (en)

Applications Claiming Priority (3)

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BE9800647 1998-09-03
BE9800647A BE1013070A3 (en) 1998-09-03 1998-09-03 MACHINE TO MAKE AND TREE TRUNK delimbing.
PCT/BE1999/000116 WO2000013485A1 (en) 1998-09-03 1999-09-03 Machine for grasping and lopping tree trunks

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BE1013070A3 (en) 2001-09-04
WO2000013485A1 (en) 2000-03-16
AU5721899A (en) 2000-03-27

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