EP1652640B1 - Sawing device for tree trunks with a support table and an adjustable stop surface - Google Patents

Abstract

The sawing device (1) cuts a log (2) longitudinally. It has a resting surface (5) for the log, and a stop console (7). There is also a clamping device (8). The resting surface and the stop console are at a preset angle to each other. The clamping device can turn about a horizontal axis (9) to reduce the angle between the resting surface and the saw (3) or its cutting plane.

Description

The invention relates to a sawing device for performing saw cuts in the longitudinal direction of tree trunks, in particular of halved or quartered or otherwise longitudinally divided logs, with a sawing tool and a block carriage, a support surface and a transverse to this and the feed direction to a guide adjustable stop bracket and a clamping device for holding the respective tree trunk or portion of a tree trunk or the like in an aligned position and a feed drive has. A sawing apparatus according to the preamble of claim 1 is known from US-A-2393940.

Such sawing devices are known and usually serve to perform a plurality of saw cuts arranged parallel to one another in the longitudinal direction of a log for the production of boards. As a result, however, only one or possibly two boards with standing annual rings can be obtained from the center of such a tree trunk, which in turn can be subdivided in the longitudinal direction. Most of the resulting boards have no standing annual rings.

Boards with standing annual rings, however, are of particularly high quality and are needed, for example, for the construction of musical instruments or for such seating boards, in which no splinters should be able to injure the user. The previously obtained from the diameter center of a tree trunk and possibly subdivided into individual pieces boards with standing annual rings are expensive, because only a very small part of a tree trunk can be used to obtain these boards with standing annual rings.

There is therefore the task of creating a sawing device of the type mentioned, with which machine and correspondingly inexpensive, a larger number of boards can be obtained with standing annual rings from a tree trunk.

This object is achieved by a sawing device according to claim 1.

With such a sawing device, a tree trunk, for example, first quartered and / or recorded such a quarter-tree trunk with the clamping device on the abutment bracket and supported on the support surface and then pivoted so that the saw in each case approximately in the radial direction of this partial cross-section of Tree trunk running Sawing cuts that result in a large part boards with standing annual rings. For example, if first sawed off a first such board of an originally quarter-tree trunk, the support surface with the stop bracket and the tensioning device can be pivoted so far that after sawing a wedge-shaped piece of waste another board with standing annual rings can be sawed off approximately on a radius of the tree trunk and so on, until the partial cross-section of the tree trunk is consumed accordingly. Depending on the thickness of the boards obtained thus can be obtained by machine from a quarter-tree trunk a relatively large number of boards with standing annual rings, so that a rational and relatively inexpensive production of these boards with standing annual rings using the device of the invention is made possible.

It is expedient if the oriented in the feed direction horizontal axis about which the support surface is pivotable with reduction of the angle between her and the saw plane, the saw or cutting plane is as close as possible to the lowest point in the pivoted position of the support surface as possible close to the saw or the sawing plane.

The sawing device may have a rotating device for aligning a lying on the support surface tree trunk in the direction of rotation and this rotating device can be lowered below the axis passing through the axis of rotation for the support surface horizontal plane and in the lowered position located in the sawing area continuation of the support surface in pivoted upwards Release the situation.

Although the sawing device according to the invention could be designed without such a rotating device, if from the outset only partial cross-sections of tree trunks to be processed on it, because they can be easily aligned in their position to be processed, without the need for a turning device. However, the presence of a turning device is a particularly expedient embodiment of the invention, because it is then possible to hang on this sawing device first complete logs and align and then with the sawing device according to the invention, for example, then to the part-cross sections in accordance with the invention so sawing that lying on radii of the cross section of the partial tree trunk areas are separated as boards with standing annual rings by the individual sections of the support surface pivots each corresponding and then the rest of the cross section of the tree trunk again and slightly beyond the sawing out of the area is moved, which corresponds to the corresponding board thickness.

The bearing surface with the stop bracket and the clamping device or collet can gradually upward or against the cutting plane and pivoted towards the stop bracket can be gradually displaced in the same way gradually towards the saw. Thus, after each saw cut, be it to produce a board with standing annual rings, be it the sawing off of a piece of wedge-shaped cross-section to prepare its next saw cut for the production of a board, be prepared by appropriate pivoting movements to corresponding predetermined pivoting angle and then performed.

With increasing pivoting of the bearing surface upwards or to the cutting plane towards the length of the displacement of the stop bracket increase, so that a partial cross section of a tree trunk in the pivoted position respectively despite the inclination of the support surface has a constant lateral offset relative to the saw. Thus, with appropriate processing progress, if from the original quarter of the cross-section tree trunk part only an acute-angled partial cross section is left and the support surface is pivoted, yet again a board of constant thickness can be obtained by the stop bracket moved relative to the support surface so far is that the lateral offset resulting from this oblique shift again corresponds to the board thickness.

Another particularly advantageous embodiment of the invention may be that the stop bracket and / or the tensioning device or collet is lowered relative to the support surface, in particular in upward or saw to pivoted position of this support surface, so that the projection of the stop bracket against the Support surface is reduced in its up or to the sawing plane pivoted position and the clamping device remains in the upward pivoted position outside the cutting plane of the saw.

By pivoting the support surface and the stop bracket and the upper, opposite the support surface protruding end of this stop bracket is pivoted more and more to the saw blade plane. There is the risk that this end gets into the saw blade or saw cut area in the further processing progress, so that a remnant of the tree trunk could not be used to the end. By lowering the stop bracket, a further pivoting can be performed and thus a further part of the remainder piece are sawn.

In this case, the distance of the tensioning device or collet chuck from the contact surface of the stop bracket adjustable and be increased with increasing pivoting upward, the clamping device is releasably and then with a shorter distance to the contact surface with the rest of the tree trunk is clamped. Is in the processing progress only a portion of the tree trunk with increasingly acute angle left, so the tree trunk or the partial cross section of the log detecting tensioning device can be solved and then braced again with this remnant that the collet now comes closer to the stop bracket, So again releases a larger part of the cross section of the workpiece.

A further advantageous embodiment of the invention may provide that the support surface is pivotable relative to the block carriage about the horizontal axis oriented in the feed direction in the opposite direction or in such a downward direction that it is inclined downwards in the direction of the stop bracket. By such an embodiment of the invention, the sawing device is particularly well suited to first record a complete in its cross-section tree, which automatically comes at the downwardly pivoted support surface to the stop brackets or the system, so that then with a rotating device, the optimal orientation very easy can be carried out. Thereafter, the tree trunk can be clamped in a known manner, the support surface swung back and then the tree trunk with the help of adjustable transverse to the feed stop bracket are moved as far as in the saw that he halved in the desired manner, for example, or up to half in conventional boards can then be divided, after which then half or possibly less than half a cross section of tree trunk for the further subdivision and the inventive extraction of Boards with standing annual rings of first quarter-section pieces can be reached. If necessary, in the case of halving the tree trunk, a board with standing annual rings originating from the middle of the cross section can first of all also be obtained.

It is advantageous if the support surface together with the stop bracket together both under reduction of the angle between it and the cutting plane of the saw and in the opposite direction or downwards is pivoted and if the angle between the support surface and the abutment surface of the stop bracket in the pivoted positions each remains the same. This avoids that upon pivoting of the support surface between the tree trunk and the abutment surface of the stop bracket, a relative movement occurs.

The bearing surface may be connected to the stop bracket and the clamping device as a structural unit and positively constrained to an arcuate guide during its pivoting. In this way, the pivoting can be carried out very easily and precisely. It is sufficient to pivot the unit connected as a structural unit, for example, summarized on a support frame essential parts for holding and feeding a tree trunk or workpiece along the arcuate guide about the horizontal, oriented in the feed direction axis, the center of this axis is the center of the radius of curvature of the arcuate or circular arc-shaped guide forms.

The bearing surface with stop bracket and tensioning device pivotally supporting block carriage can be a support surface superior, in particular approximately arc-shaped or C-shaped carrier with a circular arc-shaped guide have for the positive guidance of the pivoting movement. Thus, the circular arc-shaped guide can be attached to support the pivoting movement of the block carriage, so that the structural unit is held with the support surface on the one hand to the pivot axis and on the other hand on this guide and under certain circumstances the pivot drive can also attack on this guide, if this example Gearing has, with a pinion of a drive can comb, which is arranged on the structural unit.

An expedient embodiment of the sawing device according to the invention can provide that at least one or each stop bracket with tensioning device and with arcuate guide having carrier each has its own chassis and forms a single carriage and that the block carriage of at least two or more such, arranged in the feed direction one behind the other and each other detachable or coupled single car consists. As a result, it is possible for the user to align his sawing device flexibly to different workpiece lengths, so different lengths of logs, to start under certain circumstances, first with less single car and a lower investment and then to be able to dicing even longer logs add more single cars.

In this case, the distance and / or the number of the individual cars forming the block carriage can be changed to adapt to different lengths of tree trunks.

It should be mentioned that the sawing tool can be a band saw or optionally a circular saw and that the sawing or cutting plane can be arranged in particular vertically, but optionally also horizontally. Above all, a vertically arranged sawing or cutting plane results in an expedient Assignment of the support surface and the workpiece thereon, even in its mainly upwardly pivoted position.

Especially when combining one or more of the features and measures described above results in a sawing device, can be obtained with the boards with standing annual rings not only from the middle of a tree trunk, but what by appropriate pivoting and delivery of the workpiece such boards from several radial planes a tree trunk can be obtained, between the individual such boards relatively small, wedge-shaped in cross-section pieces of waste, which may optionally also be used for further use. Thus, not only the number of boards with standing annual rings is increased, which can be obtained from a tree trunk or a longitudinally divided tree trunk section, but these are also significantly cheaper, because their production can be performed by machine with the sawing device according to the invention.

Fig. 1

eine teilweise im Querschnitt dargestellte Stirnansicht einer erfindungsgemäßen Sägevorrichtung mit Blick auf die sich senkrecht zur Zeichenebene erstreckende Auflagefläche mit Anschlagkonsole und Spannvorrichtung, die als konstruktive Einheit verbunden und um eine nahe der Sägeblattebene befindliche, horizontale und in Vorschubrichtung orientierte Achse verschwenkbar ist und sich dabei in abwärts geschwenkter Lage befindet, um einen Baumstamm aufzunehmen,

Fig. 2

eine der Fig. 1 entsprechende Darstellung, bei welcher ein Baumstamm mit Hilfe einer Drehvorrichtung ausgerichtet und dann festgespannt ist,

Fig. 3

eine den Fig. 1 und 2 entsprechende Darstellung, nachdem der Baumstamm gegenüber Fig. 2 halbiert und dazu auch die Anschlagkonsole an ihrer Führung relativ zu der Auflagefläche in Richtung zu der Säge hin verschoben ist,

Fig. 4

eine der Fig. 3 entsprechende Darstellung, nachdem der Baumstamm geviertelt und ein Viertel seines ursprünglichen Querschnitts auf der Auflagefläche mit einer seiner ebenen Schnittflächen aufliegend festgespannt ist,

Fig. 5

eine der Fig. 4 entsprechende Darstellung nachdem von dem ursprünglich eingespannten Viertel-Querschnitt des Baumstamms wenigstens ein Brett mit stehenden Jahresringen abgesägt und die Auflagefläche mit der Anschlagkonsole nach oben so verschwenkt ist, dass die verbliebene Schnittfläche wiederum etwa vertikal steht und an ihr ein weiteres Brett mit stehenden Jahresringen abtrennbar ist,

Fig. 6

eine weiter verschwenkte Lage des Reststücks des Baumstamms, wobei der Sägeschnitt noch nicht durchgeführt und der Rest-Querschnitt auch soweit verschoben ist, dass er die Sägeschnittebene um die Dicke des zu sägenden Bretts überragt, wobei gleichzeitig angedeutet ist, dass die im Aus- führungsbeispiel vorhandene Drehvorrichtung entsprechend weit aus dem Sägebereich abgesenkt ist,

Fig. 7

eine der Fig. 6 entsprechende Darstellung nach dem Absägen des in Fig. 6 noch mit dem Restquerschnitt verbundenen Brettes,

Fig. 8

eine Seitenansicht der Sägevorrichtung mit Blick auf die mehreren, einen Blockwagen bildenden Einzelwagen, die jeweils eine Anschlagkonsole aufweisen und miteinander verbunden sind und mit ihren Fahrwerken auf einer gemeinsamen Führung verschiebbar oder verfahrbar sind, wobei die zu jeder Anschlagkonsole gehörenden, in den Fig. 1 bis 7 erkennbaren Träger mit bogenförmiger Führung der besseren Übersicht wegen weggelassen sind, sowie

Fig. 9

in schaubildlicher Darstellung ein Holzbrett mit stehenden Jahresringen.

An embodiment of the invention will be described in more detail below with reference to the drawing. It shows in partly schematized representation:

Fig. 1

a partially shown in cross-section end view of a sawing device according to the invention with a view of extending perpendicular to the plane supporting surface with stop bracket and clamping device, which is connected as a structural unit and a near the saw blade level located, horizontal and oriented in the direction of feed axis and thereby in downward swiveled to one Pick up tree trunk,

Fig. 2

1 corresponding representation in which a tree trunk is aligned by means of a rotating device and then tightened,

Fig. 3

a representation corresponding to FIGS. 1 and 2, after the tree trunk has been halved with respect to FIG. 2 and, in addition, the abutment bracket on its guide has been displaced relative to the support surface in the direction of the saw,

Fig. 4

3 is a representation corresponding to FIG. 3, after the tree trunk has been quartered and one quarter of its original cross-section has been clamped resting on the support surface with one of its flat cut surfaces,

Fig. 5

one of the Fig. 4 representation after sawed off from the originally clamped quarter-cross section of the tree trunk at least one board with standing annual rings and the support surface is pivoted with the stop bracket up so that the remaining cut surface is again approximately vertical and at her another board separable with standing annual rings,

Fig. 6

a further pivoted position of the remaining part of the tree trunk, wherein the saw cut is not yet carried out and the remaining cross-section is also shifted so far that it projects beyond the saw cut plane by the thickness of the board to be sawn, whereby it is indicated at the same time that the guide example existing rotary device is lowered accordingly far from the sawing area,

Fig. 7

6 a representation corresponding to FIG. 6 after sawing off the board still connected to the remaining cross section in FIG. 6, FIG.

Fig. 8

a side view of the sawing device with a view of the several, forming a block car single car, each having a stop bracket and are connected to each other and are movable with their trolleys on a common guide or movable, the belonging to each stop bracket, in Figs. 1 to 7 recognizable carrier with curved guide for the sake of clarity are omitted, as well

Fig. 9

in a schematic representation a wooden board with standing annual rings.

A sawing device, indicated as a whole by 1, is used for cutting saw cuts in the longitudinal direction of logs 2 (see FIGS. 1 and 2) and also for sawing halved (FIG. 3) or quartered logs (FIG. 4) as will be described Be used.

In the following, these partial cross sections of tree trunks 2 also receive the reference number 2 as an indication of the workpiece formed from such a tree trunk.

The sawing device 1 has a sawing tool 3, in the embodiment, a band saw, the sawing or cutting plane is arranged vertically. However, it would also be conceivable to have a horizontally arranged band saw and / or a circular saw.

To the sawing device 1 further includes a designated as a whole with 4 block carriage, a support surface 5 and an adjustable transversely to this and the feed direction on a guide 6 stop bracket 7 and a clamping device 8 for holding the respective tree trunk 2, also a partial cross-section thereof, in aligned position and a feed drive 24 (Fig. 8), whereby the block carriage 4 is perpendicular to the plane of Figs. 1 to 7 and relative to the band saw 3 slidably.

The bearing surface 5 or a bearing surface 5 having the support plate 5a and the arranged in a predetermined, in the embodiment at a right angle stop bracket 7 is, as the comparison of Figs. 1 to 7 illustrates a oriented in sawing or feed direction horizontal axis 9 with reduction of the angle between the support surface 5 and the saw 3 or cutting plane, in the exemplary embodiment upwards pivotable. 2, 3 and 4 respectively show positions in which the bearing surface 5 is horizontal and the abutment surface of the stop bracket 7 is vertical, with respect to which positions the aforementioned pivoting upward as shown in FIGS. 5 to 7 is possible and provided.

In addition, the stop bracket 7 with the clamping device 8 in the pivoted position relative to the support surface 5 in the direction of the saw 3 towards slidably.

Here, the oriented in the feed direction horizontal axis 9 is below the support surface 5 and the support plate 5a having these and has a small distance from the saw blade plane or the saw 3, for example, about half or the entire radius or diameter of this axis 9 or intermediate values thereof corresponds. This ensures that the saw 3 facing edge of the support surface 5 performs only slight relative movements relative to the saw 3 when pivoting.

In the exemplary embodiment, the sawing device 1 also has a rotating device 10, with which a lying on the support surface 5 tree trunk 2 can be aligned in an optimal position in which it is then sawn. It is shown in Fig. 6, that this rotating device 10 is lowered below the axis of rotation 9 for the support surface 5 extending horizontal plane and leaves in the lowered position imaginary continuation of the support surface 5 in its upwardly pivoted position. In the other figures, the lowering of this rotary device is not yet performed. However, it is in each case moved to the lowered state according to FIG. 6, when boards 11 with standing annual rings 12 are separated from the tree trunk 2 in a manner yet to be described.

Such a board 11 with standing annual rings 12 is shown schematically in Fig. 9. It can be seen that the annual rings 12 are arranged approximately perpendicular to the surface 13 of this board 11 and parallel to the longitudinal side extending in the longitudinal direction 14. Such boards 11 with standing annual rings 12 are particularly high quality and are needed for example for building musical instruments.

By comparing FIGS. 4 to 7, it becomes clear that the support surface 5 with the stop bracket 7 and the tensioning device 8 or collet can be pivoted upward in partial work steps and also the stop console 7 in the direction to the saw 3 out with the help of the guide 6 are displaced.

With the sawing device 1, according to FIGS. 1 to 4, tree trunks 2 can first be halved and quartered. Thereafter, such a quarter-tree trunk 2 by approximately along a radial plane of the cross section of this partial tree trunk extending saw cuts in boards 11 are divided with standing annual rings 12 by the partial cross-section, as indicated in Fig. 6, after a corresponding pivoting so far is moved over the axis 9, that there is a projection against the saw 3, which can then be sawed off as a board. The partial cross section of the tree trunk 2 is pivoted so far that this board has the 11 forming supernatant standing annual rings.

After sawing off this board 11 results in the situation shown in Fig. 7, from which then possibly swung the workpiece again and initially possibly a wedge-shaped remnant can be sawn off, in turn, standing in the sawing area annual rings and a supernatant, as another Board can be sawed off.

In the same way, a number of such boards 11 with standing annual rings 12 can already be obtained from the starting position according to FIG. 4. The partial cross section is in each case pivoted and moved so that a section with standing annual rings is moved beyond the saw blade level and can then be sawn off from the saw 3 as a board. Thereafter, a new pivoting and so on. The boards with standing annual rings respectively adjacent areas of the tree trunk cross-section, in which the annual rings 12 are not perpendicular to the respective surface, can be sawed off as wedge pieces with such a wedge angle that in turn an interface area arises with standing annual rings, as Fig. 6 shows him, which then, as mentioned, can be sawed off as a board 11.

It is clear and can be seen also with reference to the figures that with increasing pivoting of the support surface 5, the length of the displacement of the stop bracket 7 increases transversely to the feed direction to each turn to get a board 11 of constant thickness, because in a more steep arrangement of the support surface 5, the lateral Component of a shift in the direction of this support surface 5 initially actually getting smaller. This can be compensated by correspondingly larger displacement paths, so that a partial cross-section of a log 2 can also have a constant lateral offset relative to the saw 3 even in a pivoted position and thereby, if desired, boards 11 of the same thickness can arise. But it can also be different thickness boards 11 are obtained by the displacement is designed according to different.

In FIGS. 1 to 7 it can also be seen that in order to displace the abutment surface 7a of the abutment bracket 7, a wedge drive 15 is provided parallel to itself, in which the abutment surface 7a engages with corresponding recesses on two consecutive wedges 15a, so that at a Relative adjustment of these wedges 15a in the direction of the arrow Pf 1, the stop surface 7a is moved in the desired direction to the saw 3 out parallel to itself and thereby the distance of the collet to the stop surface 7a is reduced.

By comparing FIGS. 3 and 4, it becomes clear, for example, how the adjustment of the wedges 15a in the direction of the arrow Pf1 results in the corresponding transverse adjustment of the stop surface 7a is effected.

The stop bracket 7 and the clamping device 8 are also lowered relative to the support surface 5, especially in the upwardly pivoted position of this support surface 5, so that the supernatant of the stop bracket 7 relative to the support surface 5 in the pivoted-up position can be reduced to a Collision of the upper end portion of the stop bracket 7 and the arranged there clamping device 8 to prevent the saw 3, because in this way the clamping device 8 remains in the upwardly pivoted position outside the cutting surface and cutting plane of the saw 3, as it is especially Fig. 7 clarified. In this case, this lowering of the stop bracket 7 and, above all, the tensioning device 8 in an advantageous manner a coming that the partial cross section of the log 2 is always smaller when pivoting upwards and thus also an increasingly shorter or narrower range of this partial cross-section for applying the clamping device 8 is sufficient.

The distance between the clamping device 8 or collet chuck of the contact surface 7a of the stop bracket 7 can be adjusted, which can be reduced with increasing pivoting up this distance because - as already mentioned - the part of the tree trunk 2 to be kept smaller and smaller. In this case, the clamping device 8 can be releasably and then with a small distance from the contact surface 7a with the rest of the log 2 again braced.

According to Fig. 1, the support surface 5 and the supporting plate 5a of the sawing device 1 relative to the block carriage 4 about the horizontal, oriented in the direction of feed axis 9 in the opposite direction, ie downwardly pivotable in such a way that it towards the stop bracket 7 is inclined downwards. This makes it possible to record with the sawing device 1 also complete first tree trunks 2 and align in a simple manner, because they automatically come to lie in the lowered position of the support surface 5 on the stop bracket 7 and can then be finally aligned with the rotating device 10 before the log 2 is sawed. Thus, the sawing device 1 is also suitable for dividing tree trunks 2 in a conventional manner by successively performed parallel saw cuts in corresponding boards, but this sawing device 1 due to the possibility of pivoting the support surface 5 upwards, especially suitable from corresponding partial cross sections Perform a tree trunk 2 each extending in the radial direction Sägeschnitte and thereby to win a variety of boards 11 with standing annual rings 12.

In this case, the support surface 5 together with the stop bracket 7 together both under reduction of the angle here and the cutting plane of the saw 3 and in the opposite direction or down pivot and the angle between the support surface 5 and the abutment surface of the stop bracket 7 remains in the pivoted positions respectively equal, so that there is no relative movement between the stop bracket 7 and the tree trunk 2 in such a pivoting movement.

1 to 7 it is clear that the support surface 5 are connected to the stop bracket 7 and the clamping device 8 as a structural unit and positively guided on an arcuate guide 16 during its pivoting. Above all, the pivoting can thus be carried out structurally simply by, for example, engaging a pinion 18 on an arcuate toothing 19 and by a drive motor 20 is operated in order to take in this way in particular gradually the different inclinations. But there are also any other part-turn actuators possible.

The bearing surface 5 with stop bracket 7 and clamping device 8 pivotally supporting block carriage 4 has a support surface 5 upwardly projecting, approximately arched or C-shaped carrier 21 with the circular arc-shaped guide 16 for the aforementioned forced operation of the pivoting movement.

In Fig. 8 is shown schematically that one or each stop bracket 7 with clamping device 8 and with an arcuate guide exhibiting, but in Fig. 8 sake of clarity not shown carrier 21 each have their own chassis 22 and an individual carriage 23 forms and that the block carriage 4 of at least two or more, in the exemplary embodiment four such, in the feed direction arranged one behind the other and coupled to each other or coupled single carriage 23 consists. In this case, the distance and / or the number of individual cars 23 forming the block carriage 4 can be changed in order to be able to easily adapt the sawing device 1 to logs 2 of different lengths.

With the sawing device 1 can be the following method to win from a tree trunk 2 as many boards 11 with standing annual rings 12:

First, a complete tree trunk 2 can be placed and aligned on the support surface 5, wherein the support surface 5 is advantageously lowered. With the help of the rotating device 10, the tree trunk 2 can be optimally positioned for Sawing.

Thereafter, the log 2 shown in FIG. 2 can be pivoted together with the support surface 5 upwards until the support surface 5 has its horizontal position. By a displacement of the stop bracket 7 transversely to the feed direction on the guide 6 and in the direction of the arrow Pf 2, the tree trunk can for example be moved so far that it can be halved as shown in FIG. After a Umspannen not shown, in which the thus liberated diameter plane comes to rest on the support surface 5, it can be halved again after renewed lateral displacement, so that the quarter-cross section shown in Fig. 4 of the original full cross section of the log 2 in the sawing device 1 is clamped.

From this cross section, a board 11 can now be sawed off with standing annual rings approximately in the radial direction, wherein the pivoting of the partial cross section by means of the support surface 5 and the displacement of the stop bracket in the direction of the arrow Pf 2 are combined accordingly to a corresponding projection of the partial cross section of the log 2 over the Sägeschnittebene and the saw 3 to move out (Fig. 6), after which then this supernatant is sawn off. The such a sawed-off board 11 adjacent area that shows no standing annual rings can be cut wedge-shaped by a corresponding pivoting, the wedge angle is chosen so that this piece of waste adjacent this area again with standing annual rings on the rest cross section of the tree trunk 2 is formed , which can be shifted by a lateral shift again over the area of the saw 3 by the thickness of the desired board to obtain another board with standing annual rings 12.

This procedure can be carried out with the partial cross-sections formed from the original solid cross-section of the log 2, so that a large number of boards 11 with standing annual rings 12 can be obtained from a log 2, whereby possibly the width of these boards decreases in the course of the method because remove the remaining pieces of the log 2 by sawing out wedge-shaped pieces of waste in their radial direction.

The sawing device 1 for performing saw cuts in the longitudinal direction of tree trunks 2 has for these logs 2 a support surface 5 and a stop bracket 7 and a clamping device 8, which is oriented about a horizontal axis 9 in the feed direction with reduction of the angle between the support surface 5 and the saw. 3 or whose sectional plane is pivotable, so that partial cross-sections of a tree trunk 2 can each be sawed approximately in a radius plane, so that in each case boards 11 can be obtained with standing annual rings 12, between which optionally arise wedge-shaped waste pieces.

Claims (14)

1. Sawing apparatus (1) for making saw cuts in the longitudinal direction of tree trunks (2), particularly halved or quartered tree trunks (2), having a sawing tool (3) and a block carriage (4) which comprises a support surface (5) and a clamping device (8) for holding the respective tree trunk (2) or the like in the aligned position and an advance drive, the support surface (5) or a support plate (5a) which comprises the support surface (5) being pivotable upwards and/or about a horizontal axis (9) oriented in the direction of sawing or advance, thereby reducing the angle between the support surface (5) and the saw (3) or cutting plane, characterised in that a stop bracket (7) is provided which is adjustable at right angles to the support plate (5) and to the direction of advance along a guide (6), in that the stop bracket (7) which is arranged at a given angle or at a right angle to the support surface is pivotable with its guide (6) about the horizontal axis (9) together with the support surface and in that the stop bracket (7) with the clamping device (8) is movable towards the saw (3) even when in a pivoted position relative to the support surface (5).
2. Sawing apparatus according to claim 1, characterised in that it comprises a rotary device (10) for aligning a tree trunk (2) lying on the support surface (5) in the direction of rotation thereof and in that this rotary device (10) can be lowered to below the horizontal plane running through the rotation axis (9) for the support surface (5) and in the lowered position leaves the extension of the support surface (5) which is located within sawing range free even in the upwardly pivoted position.
3. Sawing apparatus according to claim 1 or 2, characterised in that the support surface (5) can be pivoted upwards with the stop bracket (7) and the clamping device (8) or clamping grip, and the stop bracket (7) can be moved towards the saw (3).
4. Sawing apparatus according to one of claims 1 to 3, characterised in that as the support surface (5) pivots further the length of the distance travelled by the stop bracket (7) increases, so that a partial cross section of a tree trunk (2) retains a constant lateral offset relative to the saw (3) even in the pivoted position.
5. Sawing apparatus according to one of claims 1 to 4, characterised in that the stop bracket (7) and/or the clamping device (8) or clamping grip can be lowered relative to the support surface (5), particularly in the upwardly pivoted position of this support surface, so that the amount of stop bracket (7) protruding relative to the support surface (5) in the upwardly pivoted position of the latter is reduced and the clamping device (8) remains outside the cutting plane of the saw (3) even in the upwardly pivoted position.
6. Sawing apparatus according to one of claims 1 to 5, characterised in that the spacing of the clamping device (8) or clamping grip from the support surface (7a) of the stop bracket (7) is adjustable and can be made smaller as the upward pivoting progresses, the clamping device (8) being releasable and then capable of being clamped to the rest of the tree trunk (2) at a shorter distance from the support surface.
7. Sawing apparatus according to one of claims 1 to 6, characterised in that the support surface (5) is also pivotable in the opposite direction or downwards relative to the block carriage (4) about the horizontal axis (9) which is oriented in the direction of advance, such that said support surface (5) is tilted downwards towards the stop bracket (7).
8. Sawing apparatus according to one of claims 1 to 7, characterised in that the support surface (5) together with the stop bracket (7) is also pivotable in the opposite direction or downwards, thereby reducing the angle between it and the cutting plane of the saw (3), and in that the angle between the support surface (5) and the abutment surface of the stop bracket (7) in the pivoted positions remains constant.
9. Sawing apparatus according to one of claims 1 to 8, characterised in that the support surface (5) is connected to the stop bracket (7) and the clamping device (8) as a structural unit and they are forcibly guided along an arcuate guide (16) as they pivot.
10. Sawing apparatus according to one of claims 1 to 9, characterised in that the block carriage (4) which pivotably carries the support surface (5) with stop bracket (7) and clamping device (8) has a carrier (21) which projects over the support surface (5) and is more particularly oriented in an arc-shape or C-shape, with an arcuate guide (16) for forcibly guiding the pivoting movement.
11. Sawing apparatus according to one of claims 1 to 10, characterised in that at least one or each stop bracket (7) with clamping device (8) and with a carrier (21) comprising an arcuate guide has its own drive unit (22) and forms an individual carriage (23) and in that the block carriage (4) consists of at least two or more such individual carriages (23) arranged one behind the other and coupled or adapted to be coupled to one another.
12. Sawing apparatus according to one of claims 1 to 11, characterised in that the spacing and/or the number of individual carriages (23) forming the block carriage (4) is variable.
13. Sawing apparatus according to one of claims 1 to 12, characterised in that the sawing tool (3) is a bandsaw or optionally a circular saw and in that the sawing or cutting plane is arranged vertically, in particular, optionally horizontally.
14. Sawing apparatus according to one of the preceding claims, characterised in that the internal distance of the horizontal axis (9) from the plane of the saw blade or from the saw (3) corresponds to approximately half or the whole of the radius or diameter of this axis (9).

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