Method and device for producing sawn timber from a log

Abstract

Method for producing sawn timber from a tree trunk (1), in which at least one processing surface (2) is created on the tree trunk (1) by removing a slab area and in which the tree trunk (1) is moved in a feed direction (9) against at least two milling tools (5), each of which can be moved along a feed axis (8), whereby two wane edge areas (3) adjacent to the processing surface (2) are milled out and at least one side board (4) is profiled and in which the side board (4) is separated from the tree trunk (1) by a saw cut.It is essential that the log (1) is moved from a transport position to a processing position during the feed movement and before the side board is profiled, by moving the log around and / or along at least one adjustment axis which runs orthogonally to the feed direction (9) and thereby displacing at least a leading area of ​​the log (1) transversely to the feed direction (9) in the direction of at least one of the milling tools (5).

Description

[0001] The invention relates to a method and a device for producing sawn timber from a tree trunk.

[0002] In industrial wood processing, tree trunks are processed into boards, among other things. It is typical that different cross-sectional areas of such a tree trunk are used to produce different types of boards. For example, inner cross-sectional areas are used to produce so-called main boards, while outer cross-sectional areas are used to produce so-called side boards. The main boards can comprise one or more main boards, and the side boards can similarly comprise one or more side boards.

[0003] To produce side boards, at least one side board is typically profiled directly on the log. First, a slab section of the log is removed, creating at least one machining surface extending along the log axis. This machining surface typically defines the broad side of a side board. The log is then moved forward against at least two milling tools, milling out two bark edge sections adjacent to the machining surface and defining two narrow sides of the side board. Finally, the side board is separated from the log by a saw cut.

[0004] The processing described above is usually carried out sequentially using several logs, which are moved in the feed direction against the milling tools and have a gap between them, known as the wood gap. To achieve the highest possible productivity, it is generally desirable to minimize the wood gap between two logs. However, a challenge here is that the processed logs and the side boards to be profiled can differ significantly in their geometries and dimensions. This means that the milling tools may have to travel long infeed paths before processing a log in order to profile the side board of that log in the desired way. The infeed typically occurs within the wood gap, so it has not been possible to reduce it arbitrarily until now.

[0005] To achieve the highest possible timber yield, it may also be necessary to profile side boards that are not parallel to the main axis of the log. One way to achieve this is to move the log along its axis against the milling tools and shift the tools along their respective feed axes during milling. This allows the side board profile to be created with the desired non-parallel orientation relative to the main axis of the log. Depending on the degree of angle between the side board and the main axis, the milling tools may also need to travel considerable distances during milling.This also has a detrimental effect on the desired reduction of the wood gap, as the milling tools for processing a subsequent log may have to be moved in the opposite direction and also have to cover long distances.

[0006] The object of the invention is to propose at least one method and one device by which the efficiency in processing tree trunks can be increased by reducing the wood gap.

[0007] The problem is solved by means of two methods according to claims 1 and 14 and a device according to claim 15. Advantageous further developments are the subject of dependent subclaims.

[0008] The method according to the invention serves to produce sawn timber from a tree trunk, in which at least one machining surface is created on the tree trunk by removing a slab area in a manner known per se. The tree trunk is moved in a feed direction against at least two milling tools, thereby milling out two bark edge areas adjacent to the machining surface, thus profiling at least one side board. The milling tools are each adjustable along a feed axis. The side board is then separated from the tree trunk by a saw cut.

[0009] It is essential for the inventive method that the log is moved from a transport position to a machining position during the feed movement and before the side board is profiled. For this purpose, the log is moved around and / or along an adjustment axis that runs orthogonally to the feed direction. This shifts at least a leading section of the log transversely to the feed direction in the direction of at least one of the milling tools.

[0010] The invention is based on the finding that the gap between two logs being processed can be significantly reduced by positioning the log before profiling the side board in a way that minimizes the travel distance of at least one, preferably two, milling tools. According to the invention, the log is moved such that the leading section of the log is moved towards the milling tool, requiring it to travel only a short distance, or preferably no distance at all, before engaging the log in a cutting action. Compared to a conventional method where the log is not moved and only the milling tools are advanced along their axes to profile the side board, a smaller gap and thus higher productivity in woodworking can be achieved.

[0011] In particular, the displacement of the advancing section of the log occurs at least partially in a plane in which the feed axis of the at least one milling tool runs, or preferably the feed axes of two milling tools. The feed axes of the milling tools preferably run orthogonally to the feed direction and substantially parallel to the machining surface of the log when it is in the machining position.

[0012] The transport position refers to a position of the log in which it is moved in the feed direction before being moved into the machining position. The machining position refers to a position of the log in which it is moved against the milling tools for profiling the side board and at least with its leading section engages in a cutting action with at least one of the milling tools. It is within the scope of the invention that the log remains in the machining position during the profiling of the side board or is moved further during profiling, in particular into at least one other machining position. Furthermore, the invention is not limited to how the transport position and / or the machining position are defined. It is therefore conceivable that the transport position and the machining position are defined by a relative orientation and / or a relative position of the log with respect to the feed direction or...The feed axis of the log can be distinguished from one another. In other words, the log in the transport position can have a first relative orientation and / or a first relative position with respect to a feed direction or feed axis, and in the transport position it can have a second relative orientation and / or a second relative position with respect to the feed direction or feed axis. The same can apply to a first processing position and a second processing position during the profiling of the side boards.

[0013] It is within the scope of the invention that the bark area is separated from the tree trunk as a continuous piece of bark, or alternatively, that it is removed from the tree trunk by machining into wood chips or in a comparable form. In particular, after the removal of at least one bark area, the tree trunk can be in the form of a so-called model with two processing surfaces or as a cant with four processing surfaces, which are separated from each other in pairs by a wane area of ​​the tree trunk. The wane area here refers to an outer circumferential area of ​​the tree trunk, the nature of which is determined by the natural growth of the tree trunk.

[0014] In one conceivable embodiment, the log is oriented after processing with the milling tools and during its feed movement such that the machining surface faces laterally from the log. In other words, the machining surface is located, in particular, on a left or right side of the log and runs, at least partially, parallel to a direction of gravity. Such an orientation of the log, in which the side board to be profiled is arranged laterally on the log after profiling, is advantageous because it can fall off after a saw cut due to the effect of gravity.Since the feed axes of the milling tools run parallel to the direction of gravity in such an orientation of the tree trunk, it is necessary to move the tree trunk at least partially against the direction of gravity in order to adjust it according to the invention and thereby reduce the wood gap in order to carry out the method according to the invention.

[0015] To prevent the log from moving against the direction of gravity, the log can also be positioned such that the working surface is oriented essentially perpendicular to the direction of gravity, i.e., pointing upwards or downwards, and the feed axis of at least one of the milling tools runs perpendicular to the direction of gravity. For adjusting the log, where the leading section is moved perpendicular to the feed direction towards the milling tool, the log can be moved perpendicular to the direction of gravity and, in particular, does not need to be lifted around and / or along the adjustment axis during the adjustment. This enables a particularly energy-efficient process.

[0016] A sideboard can form part of a sideboard or a sideboard bundle comprising one or more sideboards. The surface created by removing the slab can define at least a portion of a long, broad side of a sideboard. By milling out the bark edges, two long, narrow sides of a sideboard can be created.

[0017] Furthermore, the invention is not limited to a specific geometry of the sideboard to be profiled. Rather, it is within the scope of the invention that the sideboard can be profiled with a straight profile, or with a curved profile where the sideboard is bent around an axis of curvature that runs essentially perpendicular to the machining surface, or with a curved profile where the sideboard is bent around an axis of curvature that runs essentially parallel to the machining surface. The only relevant requirement is that the log, with its leading edge, is brought into close proximity to at least one of the milling tools so that the tool has to travel the shortest possible path to engage in a machining action with the log in its machining position.It is also within the scope of the invention that the method is carried out on a tree trunk with a substantially straight trunk axis or on a tree trunk with a curved trunk axis. In particular, the curved course of the side board or the side board to be profiled and / or the trunk axis may lie in a plane in which the feed axis of at least one milling tool also runs.

[0018] Preferably, the log is adjusted around and / or along the adjustment axis into the processing position depending on the position and / or orientation of a preceding log. This makes it possible to adjust the processing position of the following log in such a way that the feed position of the milling tool processing the preceding log does not need to be changed, or only minimally. This results in various advantages depending on the trajectory with which the side board of the preceding log is produced.

[0019] In an advantageous embodiment, at least two logs are moved successively in the feed direction, with a sideboard being profiled on each of the two logs by means of at least one milling tool. During the profiling of the sideboard of the first log, at least one of the milling tools is advanced along its feed axis. Before profiling the sideboard of the second log, the second log is brought into the processing position by moving the log around and / or along the adjustment axis, which runs orthogonally to the feed direction, thereby moving at least a leading section of the second log in the direction of the at least one milling tool. Preferably, the milling tool is not advanced while it is located in a gap between the first and second logs.

[0020] The embodiment of the method described above is advantageous when the side board of the first log is to be profiled with a non-parallel orientation to the log axis, and the milling tool is advanced during profiling to achieve this orientation of the side board relative to the log axis. To reduce the gap between the wood and the second, subsequent log, the latter can be shifted with its leading section transverse to the feed direction into a position where the milling tool is already located as a result of processing the preceding, first log. This preferably prevents the milling tool from being advanced and allows it to engage with the second log immediately after processing the first, with a minimal wood gap. In this respect, the second log can be considered the log processed according to the invention.

[0021] It is also conceivable that at least two logs are moved successively in the feed direction, with the two milling tools profiling a side board on each log. After profiling the side board on the first of the two logs, at least one of the milling tools is advanced along its feed axis. Before profiling the side board on the second of the two logs, the second log is brought into the machining position by moving it around and / or along the adjustment axis, which runs orthogonally to the feed direction. This shifts the leading section of the second log transversely to the feed direction in the direction of the milling tool. In particular, the leading section of the log is moved in the opposite direction to the milling tool.Preferably, the milling tool is positioned while it is in a gap in the wood between the first log and the second log.

[0022] According to the further development described above, the milling tool can be positioned in a gap between the first and second logs to reach a position where it can engage the second log in a machining action. Simultaneously, the leading section of the second log can be moved in the opposite direction to the milling tool's approach movement, resulting in the preferred counter-movement mentioned above. In this way, the milling tool's approach path can be significantly shortened compared to a method where the log is not moved between a transport position and a machining position, thus achieving a corresponding reduction in the width of the gap. Therefore, the second log can also be considered, in this context, as the log being machined according to the invention.

[0023] In a further advantageous embodiment, the log is brought into the machining position by rotating it around an axis of rotation that runs perpendicular to the feed direction. At least one of the milling tools is advanced along its infeed axis before milling the log; this infeed axis runs perpendicular to both the feed direction of the log and the axis of rotation.

[0024] Rotating the log is advantageous, as explained above, to move at least a leading section of the log towards one of the milling tools. This allows the milling tool to travel a shorter path before engaging the log during machining. The axis of rotation can be an adjustment axis according to the invention. The advantageous embodiment is not limited to the angle by which the log is rotated to move from the transport position to the machining position. Rather, it is within the scope of the advantageous embodiment that the log is rotated from the transport position to the machining position during the feed movement in such a way that the side board to be profiled can be oriented with its axis of extension substantially parallel or non-parallel to the feed direction.

[0025] In an advantageous further development, a cutting solution for the log is determined before profiling the at least one side board. This solution comprises a substantially straight side board profile along the log, which is perpendicular to a log axis. The log is rotated around its axis of rotation such that a target extension axis of the side board is oriented parallel to the feed direction in the log's processing position. The side board is profiled according to the cutting solution by moving the log in the processing position against at least one of the milling tools, with the milling tool remaining stationary with respect to its feed axis during the profiling of the side board.

[0026] The aforementioned refinement is particularly advantageous when the desired extension axis of the side board is oriented at an angle to the trunk axis in a plane parallel to the processing surface of the log. By rotating the log around its axis of rotation, the side board can be aligned along the feed direction, so that no infeed of the milling tool is required during milling to profile the side board according to the cutting solution. Instead, the desired side board profile on the log can result solely from the feed movement of the log against the milling tools.

[0027] In another advantageous embodiment, a cutting solution of the log is determined before the profiling of the side board, which includes a substantially straight side board profile on the log, which in particular runs at an angle to a log axis, and the log is rotated around the axis of rotation in such a way that a target extension axis of the side board is oriented non-parallel to the feed direction.

[0028] If the intended axis of extension of the side board is not oriented parallel to the feed direction in the machining position, the side board can be produced according to the cutting solution or differently. For this purpose, at least one milling tool can be moved relative to its feed axis during the profiling of the log, or it can remain stationary.

[0029] In an advantageous further development, where the side board is profiled according to the cutting solution, at least one of the milling tools is fed in relation to its feed axis during the milling of the log. In particular, the feed can be dependent on a feed rate and the length dimension of the log in order to profile the side board in a straight line and according to the cutting solution with the desired orientation relative to the log axis.

[0030] In another advantageous embodiment, the side board is profiled differently from the cutting solution by keeping at least one of the milling tools stationary with respect to its feed axis during the profiling of the side board, i.e., by not advancing it further. While this results in the side board being profiled with a path that deviates from the intended extension axis, potentially leading to a reduction in wood yield, investigations by the applicant have shown that such reductions can be acceptable in order to achieve high plant productivity by minimizing the wood gap.

[0031] The cutting solution can, among other things, specify the relative position of a side board in relation to the trunk geometry. The target axis of extension can be considered the central axis of the side board to be profiled. The cutting solution can be determined by measuring the tree trunk using a profile sensor and feeding the collected data to a processing unit, which then outputs the cutting solution to achieve optimal timber yield.

[0032] In an advantageous further development, the milling tools are each designed as rotating milling heads whose axes of rotation form an acute angle with a plane oriented orthogonally to the feed direction. In particular, this acute angle can be fixed.

[0033] The further development described above is based on the understanding that the machining of bark-edged areas is usually accompanied by recutting on the profiled side board when the milling tools, and especially the cutting edges attached to them, are guided parallel to the side board, particularly its narrow sides. To prevent this, the milling tools can be tilted relative to the feed direction, so that the aforementioned acute angle is established between the axes of rotation of the milling heads and a plane oriented orthogonally to the feed direction. Furthermore, by precisely aligning the wood, in which a log is rotated around an axis of rotation, readjustment of the acute angle during milling of the log can be avoided, so that the acute angle can be fixed, as indicated above.This entails constructive advantages in the storage of the milling tools.

[0034] The adjustment of the log into the processing position according to the invention is not only advantageous when the log has only one side board to be profiled on one side. Advantages also arise when the log is to be provided with two side board profiles on two opposite sides.

[0035] In an advantageous further development, removing two bark areas from the log creates two machining surfaces facing in opposite directions. The log is moved in a feed direction against at least four milling tools, milling out four bark edge areas adjacent to the machining surfaces, thus profiling two side boards on the log. Two subsequent saw cuts separate the two side boards from the log. Before profiling the two side boards, the log is moved from the transport position to the machining position by moving the log around and / or along the adjustment axis, thereby shifting at least the leading section of the log transversely to the feed direction towards at least two of the milling tools.

[0036] The log, with two opposing machining surfaces, can be moved from the transport position to the machining position as described above. It is particularly advantageous if the target axes of extension of the side boards are essentially parallel to each other and the side boards have essentially the same width, so that the feed paths for all milling tools used to profile the side boards can be identical and, as a result of the log movement described here, comparatively short. The parallel alignment of the side boards can, in particular, lie in a plane parallel to the machining surfaces on which the side boards are to be profiled.

[0037] However, due to the natural growth of tree trunks, it is conceivable that side boards on opposite sides of the tree trunk may not run parallel to each other with their intended extension axes according to the cutting solution, especially in a common plane that is oriented parallel to the processing surfaces.

[0038] In an advantageous further development, a cutting solution of the log is determined before the longitudinal sides of the side boards are profiled. This solution comprises two non-parallel side board profiles, each along its intended axis of extension. The log is then rotated around its axis of rotation such that, in the processing position, the two intended axes of extension define an angular range that includes the feed direction. In particular, the log in the processing position is oriented along an angle bisector between the intended axes of extension of the side boards and parallel to the feed direction. Preferably, the non-parallel orientation of the intended axes of extension lies in a plane that is substantially parallel to the two processing surfaces.

[0039] In a further advantageous development, the log is processed using milling tools according to the cutting solution, and the side boards are produced according to the desired extension axes by adjusting the milling tools transversely to the feed direction and along their respective infeed axes during the milling process. This makes it possible to profile the side boards as specified by the determined cutting solution, thus achieving optimal wood yield. In particular, the infeed is determined by the log feed rate and the orientation of the desired extension axes relative to the feed direction.

[0040] In another advantageous further development, the tree trunk is processed using the milling tools in a manner deviating from the cutting solution, in that the milling tools, which serve to profile two different side boards, are fixed along their respective feed axes during the milling process and the side boards are each produced with actual extension axes that each have an angular deviation from their respective target extension axis.

[0041] Investigations by the applicant have shown in this context that adjusting the log to the processing position is also advantageous even if the side boards are not profiled with the optimal orientation relative to the log axis. Instead, a deviation from the ideal cutting solution can be deliberately accepted by not feeding the milling tools during milling. This is conceivable, for example, if the angle between the target longitudinal axes of the side boards and the log axis is relatively small, so that the reduction in timber yield is acceptable in favor of a smaller gap in the log.

[0042] In particular, during machining, the feed direction between the target longitudinal axes of the side boards can be oriented along an angle bisector. The angular deviation during milling of the log can then correspond to half the angle between the target longitudinal axes of the side boards.

[0043] In an advantageous embodiment, the log is at least partially brought into the processing position by being moved along a translational axis that runs orthogonally to the feed direction. The translational axis is a possible adjustment axis within the meaning of the invention.

[0044] A translational adjustment of the log is particularly advantageous if the side board to be profiled on the log has a target extension axis that is already oriented parallel to the feed direction in the transport position of the log, i.e. before its adjustment, and at least one milling tool must be positioned before profiling the side board in order to profile the side board according to the desired dimensions.

[0045] In an advantageous further development, a cutting solution for the log, particularly the second log, is determined before profiling the at least one side board. This solution includes a side board profile along the log, particularly the second log. A target extension axis of the side board runs essentially parallel to a trunk axis. The log is brought into the processing position by shifting it along the translation axis with its target extension axis, depending on a preceding log.

[0046] The further training described above is based on the finding that a translational adjustment of the tree trunk can be advantageous if the side board to be profiled runs essentially parallel to the trunk axis and can be profiled with a small wood gap while achieving the advantages described above, if it is brought into its processing position according to the position of the preceding tree trunk.

[0047] In an advantageous further development, at least two consecutive logs in the feed direction are adjusted in such a way that the side boards to be profiled are aligned along a common machining axis before the logs are moved against the milling tools.

[0048] In an advantageous further development, the log is displaced around and / or along at least one adjustment axis, which runs orthogonally to the feed direction, relative to the milling tools depending on a position and / or orientation of another, preceding log, before the log is moved in the feed direction against the milling tools.

[0049] In an advantageous further development, the log is moved in the feed direction by means of a plurality of conveyor roller pairs, of which at least two conveyor roller pairs are arranged spaced apart from each other along the feed direction, and the log is brought into the processing position by displacing at least one of the conveyor roller pairs relative to the other conveyor roller pair and / or displacing the at least two conveyor roller pairs together transversely to the feed direction.

[0050] The conveyor rollers of a pair of conveyor rollers can each be driven into a rotational movement, imparting the log to the feed motion via their outer surfaces. Furthermore, the conveyor rollers can each be mounted to allow adjustments perpendicular to the feed direction, enabling them to transmit an adjustment movement to the log during their rotation.

[0051] For a translational movement of the log, it is advantageous if at least one pair of conveyor rollers is displaced by one adjustment path. To prevent unwanted twisting of the log, another pair of conveyor rollers can be displaced by the same adjustment path. For a rotational movement of the log, it is advantageous if one pair of conveyor rollers is displaced relative to another pair of conveyor rollers by one adjustment path.

[0052] It is a further advantageous development that the conveyor roller pairs are each coupled to at least one rotary drive and one adjustment drive, which in turn are controlled by a control unit. The control of the rotary drive and the adjustment drive can be dependent on the cutting solution and, in particular, on whether the log is to be profiled according to the cutting solution or differently. Preferably, the log is moved from the transport position to the processing position by means of more than two conveyor roller pairs along the feed direction and / or transversely to the feed direction.

[0053] The object of the invention is also achieved by a method according to claim 14. This serves to produce sawn timber from a tree trunk and can in particular be carried out alone or in addition to the method already described above or one of its advantageous further developments.

[0054] According to the invention, at least one machining surface is created on the log by removing a bark area. During a feed movement in a feed direction, the log is moved against at least two milling tools, each of which can be positioned along a feed axis. This mills out two bark edge areas adjacent to the machining surface and profiles at least one side board. The side board is then separated from the log by a saw cut. Before profiling the side board, a cutting solution for the log is determined, which includes a side board profile. The log is moved against the milling tools in a first machining position and, during the profiling of the side board, is moved from the first machining position to a second machining position.The side board is profiled according to the cutting solution by moving the two milling tools along their feed axes during the profiling of the side board.

[0055] The method described above is based on the applicant's finding that it can be advantageous for the log, after profiling the side board, to be positioned with its trunk axis in a desired orientation relative to its feed direction. This is the case, for example, when the log is processed after profiling using a different separating agent that cannot be adjusted, or can only be adjusted with great difficulty, to adapt to the geometry and dimensions of the log, so that it may be necessary to align the log with its trunk axis, at least in the area where the separating agent engages with the log.In order to profile the side boards according to the cutting solution, the invention provides that the two milling tools are positioned during the profiling of the side board and the movement of the log from the first to the second machining position. This makes it possible to profile the side boards as desired, even though the log is rotated around its axis of rotation during machining.

[0056] It is advantageous that, prior to profiling the at least one side board, a cutting solution of the log is determined, which comprises a substantially straight side board profile on the log, which is oriented at an angle to a log axis, and the log is moved against the milling tools in the first processing position, in which the desired extension direction of the side board is oriented parallel to the feed direction, and during profiling of the side board is brought from the first processing position to a second processing position, in which the log axis is oriented parallel to the feed direction, wherein the side board is profiled according to the cutting solution by advancing the two milling tools along their feed axes during profiling of the side board.

[0057] The above-described procedure is conceivable if the log is to be profiled as described above and the side board is immediately separated from the main product in a so-called pre-cut by means of a saw cut. In particular, the log can be moved along its axis against the first separation means used, especially a pre-cutting saw device. Preferably, the log is positioned with its axis in the second processing position such that the axis of extension of the side board is aligned centrally between two saw blades, by means of which the side board is separated.

[0058] In this process, the main part of the log being profiled can be in contact with several side boards around its circumference. At least one of these side boards is oriented perpendicular to the log axis, as described above, and is separated from the main part of the log during the initial cut. The remaining side boards, which are typically arranged at an angle of approximately 90 degrees to the main board, are then also profiled and separated from the main part in a subsequent cut. Unlike the initial cut, this second cut involves simultaneously separating the side board from the main part with a splitting of the main part using several saw blades oriented parallel to each other.To avoid subjecting the saw blades to excessive bending stress during recutting due to trunk curvature, it can be advantageous to align the tree trunk specifically before recutting in the case of curved trunk lines.

[0059] In an advantageous further development, a cutting solution of the log is determined before the profiling of the at least one side board, wherein the side board path and the log path are curved and the log is moved against the milling tools in the first machining position and is brought from the first machining position to a second machining position during the profiling of the side board, in which the log axis and / or the side board is oriented parallel to the feed direction in an area which lies behind the profiling tools with respect to the feed direction, wherein the side board is profiled according to the cutting solution by advancing the two milling tools along their feed axes during the profiling of the side board.

[0060] In particular, a second cutting device, especially a resaw device, is arranged in the area which lies behind the profiling tools with respect to the feed direction, by means of which the resaw is carried out.

[0061] As mentioned above, the problem of the invention is also solved by a device according to claim 15.

[0062] The device according to the invention is used for producing sawn timber from a tree trunk, in particular by carrying out the method according to the invention or an advantageous embodiment thereof. The device comprises a separating means configured to separate a slab from a tree trunk and to create at least one processing surface, and a feed means configured to move the tree trunk in a feed direction. The device further comprises two milling tools arranged such that, during the feed movement, the tree trunk is moved against the milling tools in such a way that two bark edge areas adjacent to the processing surface are milled out, thereby profiling the longitudinal sides of a side board. The device also includes a sawing means configured to separate the side board from the tree trunk.It is essential that the feed device is designed to adjust the log from a transport position to a machining position around and / or along at least one adjustment axis which runs orthogonally to the feed direction, and thereby at least a leading area of ​​the log can be displaced transversely to the feed direction in the direction of at least one of the milling tools, in particular parallel to a feed axis of the milling tool.

[0063] Preferably, the device according to the invention is suitable for carrying out a method according to the invention or an advantageous embodiment thereof. In this respect, the descriptions of the method according to the invention and its advantageous embodiments apply accordingly.

[0064] Preferably, the feed mechanism comprises a plurality of conveying rollers, each of which can be driven into a rotational movement to effect a feed movement of the log and which can be displaced transversely to the feed direction to effect an adjustment of the log. It is advantageous for the conveying rollers to be individually controllable or at least mechanically coupled to each other in pairs. In particular, it is conceivable that several pairs of conveying rollers can be adjusted independently of each other transversely to the feed direction.

[0065] Preferably, a drive system is provided to effect the rotational movement and / or the adjustment movement of the conveyor rollers. In particular, a control unit can be provided to control the drive system, especially based on a control program that specifies a relationship between a required conveyor roller movement and setting a processing position for the log. The conveyor roller movement, which is adjustable by means of the control unit, comprises in particular a rotational movement of at least one roller and / or an adjustment movement transverse to the feed direction of the log, especially in conjunction with a conveying movement of at least another conveyor roller. It is an advantageous embodiment that the control unit is configured to determine a cutting solution for the log.Preferably, the control unit is connected via signal technology to one or more profile sensors, by means of which a basic geometry can be determined.

[0066] The advantages and possible embodiments of the invention are explained below with reference to exemplary embodiments and the figures.

[0067] It shows: Figure 1: A method in which a log is rotated from a transport position to a processing position before profiling a sideboard; Figure 2: A method in which a log is rotated from a first processing position to a second processing position during the profiling of a sideboard for a pre-cut; Figure 3: A method in which a log is rotated from a first processing position to a second processing position during the profiling of a sideboard for a re-cut; Figure 4: A method in which two successive logs are each rotated from a transport position to a processing position before profiling a sideboard; Figure 5: A method in which a log is rotated into a processing position before profiling two sideboards located on opposite sides;Figure 6 shows a method in which a tree trunk is translationally adjusted into a processing position before profiling a side board; Figure 7 shows a method in which two successive tree trunks are each translationally adjusted into a processing position before profiling a side board.

[0068] When processing logs into boards, different cross-sectional areas are used to produce different types of boards. An inner cross-sectional area typically serves to produce so-called main boards, while an outer cross-sectional area is used to produce so-called side boards. The log is usually profiled using milling tools to produce at least one side board, which is then separated from the log.

[0069] In the devices used for this purpose, logs are typically moved one after the other against the profiling tools, with a gap known as the "wood gap." This allows the tools to engage with the log and mill out two previously created wane areas, thus profiling the side boards. To achieve high productivity in this type of log processing, a common goal is to reduce the wood gap.

[0070] With varying log geometries, it is necessary to individually adjust the milling tools used for profiling along their respective feed axes, at least before profiling begins, to profile side boards with different widths and profiles. Here, the milling tools are each moved into a feed position where they engage with a leading end of the log to mill out the bark edges. The milling tools are typically adjusted while they are positioned between a log that has already been profiled and one that is yet to be profiled, i.e., in the gap between the logs. Since the gap between the logs, at a given feed rate, dictates the time within which the adjustment can be made, this time cannot currently be reduced arbitrarily.

[0071] Besides the width of the side boards, their desired orientation relative to the trunk axis also influences the reduction of the wood gap that can be achieved so far. If, in order to increase wood yield, the side boards are to be profiled with a non-parallel orientation to the trunk axis, the milling tools must be adjusted during the feed movement of the log and the profiling process. With a pronounced angle of the side boards relative to the trunk axis, the milling tools must travel long distances and, if necessary, be moved in the opposite direction to process a subsequent log. This also requires a sufficiently large wood gap.

[0072] The method described below makes it possible to reduce the wood gap and thereby significantly increase productivity in the profiling of side boards. Figure 1Figure a) shows a tree trunk 1 with a previously created machining surface 2 and two adjacent bark edge areas 3. In the figures shown here, the tree trunk 1 can be represented, in particular, as a model with two machining surfaces 2 or as a blank with four machining surfaces 2, which are distributed around the outer circumference and separated from each other in pairs by a bark edge area 3. To produce a side board 4, it is to be profiled on the tree trunk 1 using two milling tools 5. Subsequently, a saw cut is made by means of which the previously profiled side board 4 is separated from the tree trunk 1.

[0073] The side board 4 to be profiled has a target extension axis 6 before the processing of the tree trunk 1, which lies in the image plane of the Figure 1 , in which the processing area 2 is also located, is oriented at an angle to the trunk axis 7.

[0074] For a typical sideboard profiling using standard methods, the milling tools 5 from the one shown in view a) would have to be used. Figure 1 The milling tools 5, as shown, are initially positioned along their respective feed axes 8 such that they are moved towards the leading end of the log 1 in order to engage in a cutting action with the log 1. During profiling, the milling tools 5 must then be repositioned in the opposite direction to produce the side board 4 according to the target extension axis 6 shown here. These feed movements of the milling tool 5 require sufficiently large gaps in the wood both to a leading log (not shown here) and to a trailing log (also not shown here).

[0075] To reduce the gaps in the wood, the one shown in view a) of the Figure 1The tree trunk 1 shown is rotated from its transport position (see view a) of the figure) about an axis of rotation and thereby into a processing position (see views b), c) of the Figure 1 ) brought into position, in which it is moved against the milling tools. For this purpose, the leading, end-face area of ​​the log 1 is rotated around an axis of rotation in the direction of the milling tools 5. The axis of rotation runs orthogonal to the feed direction 9 and is shown in view a) of the Figure 1 oriented orthogonally to the image plane or the straight side 2. The possible processing positions into which the tree trunk 1 can be brought by a rotation about the axis of rotation are shown in views b) and c) of the Figure 1 shown.

[0076] According to view b) of the Figure 1The side board 4 to be profiled is oriented with its target extension axis 6 parallel to the feed direction 9, and the trunk axis 7 is oriented perpendicular to this. This leads to advantages with regard to the required infeed paths of the milling tools 5 both before and during the profiling of the log 1. The infeed path before profiling is shortened because the leading end of the log can be moved in a counter-rotating motion to the milling tools 5, so that at least one of the milling tools 5 reaches the required infeed position faster than without rotating the log 1 about the axis of rotation. Furthermore, according to view b), the Figure 1The need to feed the milling tools 5 during profiling can be completely dispensed with, since the side board 4 to be produced is oriented parallel to the feed direction, so that it can be profiled according to its target extension axis solely as a result of the feed movement against the milling tools 5.

[0077] In an alternative embodiment, the tree trunk 1 can be brought into a different processing position, which is shown in view c) of the Figure 1 As shown. Here, neither the intended extension axis 6 of the side board 4 nor the trunk axis 7 is oriented parallel to the feed direction 9. In comparison to the transport position shown in view a) of the Figure 1As shown, the angle between the target extension axis 6 and the feed direction 9 is reduced, which also leads to the advantage of a shorter infeed path of the milling tools 5 before and during milling. To profile the side board according to the target longitudinal extension axis 6, an infeed of the milling tools 5 along their respective infeed axes 8 is required during milling. Nevertheless, the required infeed path can be significantly reduced compared to the infeed path usually required.

[0078] Another advantage, which is due to the processing positions according to views b) and c) of the Figure 1This can result from the fact that the milling tools 5 typically used are designed as rotating milling heads arranged at an acute tracking angle 11 relative to the feed direction 9. In other words, the respective axes of rotation of the milling heads form an acute angle with the plane oriented orthogonally to the feed direction.

[0079] Such a track angle 11 is advantageous to prevent the milling heads 5 from recutting during the profiling of side boards. A common challenge is that the track angle 11 must be adjustable when the milling heads 5 are moved along their respective feed axes during profiling, otherwise recutting of the milling heads 5 can occur. By rotating the log 1 into a machining position as shown in views b) and c) of the Figure 1However, the track angle can advantageously be fixed, since a targeted alignment of the log already achieves an optimal relative position between the side board and the milling tools, preventing recutting. Furthermore, the lack of adjustment of the angle between the milling tools 5 relative to the side board 4 to be produced also has a positive effect on minimizing the wood gap.

[0080] To carry out the procedure based on views a), b), c) of the Figure 1As shown, a cutting solution for the log 1 can be determined before or after the processing surface 2 is created. The subsequent processing of the log 1, and in particular the profiling of the side board 4, depends on this solution. The cutting solution can be determined by measuring the log using one or more geometric sensors and then calculating an optimal arrangement and orientation of the main and side boards relative to each other and to the log.

[0081] To move tree trunk 1 into the desired processing position according to view b) or c) of the Figure 1To convey the log, a conveying device is used, comprising several conveying rollers 10 arranged in pairs spaced apart from each other in the feed direction. The conveying rollers 10, of which only one is labeled for clarity, can each be set into a rotary motion 11 and impart the log to the feed motion via contact on their respective outer surface. Furthermore, the conveying rollers 10 are each translationally movable along their own adjustment axis 13 and can be set into a translational movement 14 transverse to the feed direction. By relative adjustment of one pair of conveying rollers to another, it is possible to rotate the log 1 during the feed motion and thereby bring it into the machining position in which it can be machined by the milling tools 5.

[0082] Figure 2This illustrates a process in which the log 1 is moved from a first processing position to a second processing position during the profiling of the side boards 2. This can be done independently or after completion of the steps described in Figure 1 The process steps shown are carried out.

[0083] Analogous to the explanations regarding Figure 1 is in view a) of the Figure 2 A log 1 with a machining surface 2 is shown, which is moved in the feed direction 9. For profiling a side board 4, the log 1 is brought into a machining position by adjusting the conveyor rollers 10 transversely to the feed direction, whereby the explanations to Figure 1 The following apply accordingly.

[0084] Before profiling the side board 4, a cutting solution for the log 1 is determined, which includes a substantially straight side board profile 1 on the log 1, oriented at an angle to a log axis 7. The log 1 is in a first processing position in which the intended extension direction 6 of the side board is oriented parallel to the feed direction and which is shown in view a) of the Figure 2 This is illustrated by moving against the milling tools 5.

[0085] During the profiling of the side board 4, the log 1 is moved from the first processing position to a second processing position by rotating the log 1 around the axis of rotation, which is orthogonal to the image plane of the Figure 2 The process is rotated. This can be seen from view b) of the Figure 2To illustrate. The rotation of the log 1 around the axis of rotation occurs until the log axis 7 is oriented parallel to the feed direction 9 and the log 1 is thus in the second processing position. This is view c) of the Figure 2 The side board is profiled according to the cutting solution by moving the two milling tools along their feed axes 8 during the profiling of the side board 4. In other words, the rotation of the log 1 does not affect the straight course of the side board 4. Rather, the milling tool 5 is moved along the feed axis 8 in such a way that the desired straight course of the side board 4 is achieved despite the rotation of the log 1.

[0086] This is based on Figure 2The illustrated method is based on the understanding that it can be advantageous to orient the log 1 with its trunk axis 7 parallel to its feed direction during profiling of the side board 4 by appropriately controlling the conveyor rollers 10 and the milling tools 5 and adjusting them transversely to the feed direction 9. This is necessary, for example, if the log 1 is to be processed immediately after profiling using a separating agent that cannot be adjusted, or can only be adjusted with great difficulty, to adapt to the geometry and dimensions of the log 1.In order to profile the side board 4 with an angled profile relative to the trunk axis 7, in accordance with the cutting solution, the two milling tools 5 are positioned as described above during the profiling of the side board 4 and the movement of the log 1 from the first to the second machining position. This makes it possible to profile the side board 4 in a straight line while the log 1 is rotated around its axis of rotation.

[0087] The procedure described above is conceivable if the log is to be profiled as described above and the side board is immediately separated from the main product in a so-called pre-cut using a saw cut. As shown in view c) of the Figure 2As illustrated, the log 1 is moved along its axis against a pre-cutting saw 15. By laterally adjusting the log with respect to the feed direction 9, it is positioned in the second processing position such that the axis of extension of the side board 4 is aligned centrally between two saw blades of the pre-cutting saw 15, by means of which the side board 4 is separated from the log 1, as shown in view d) of the Figure 2 This is made clear.

[0088] The remaining side boards 4, which are arranged at a 90-degree angle to the side boards 4 separated in the pre-cut, are subsequently also profiled and separated from the main product in a so-called re-cut. This is demonstrated by Figure 3 shown which a targeted alignment of the tree trunk 1 according to the explanations to Figure 2 as shown in views a), b), c) and d).

[0089] In contrast to the pre-cut, the recutting process involves simultaneously separating the side board 4 from the main product with the main product by means of several saw blades oriented parallel to each other, which are part of a recutting device 16. To prevent the saw blades from being subjected to excessive bending stress during the recutting process due to trunk curvature, it can be advantageous in the case of curved trunks to align the log 1 specifically for the recutting process.

[0090] Analogous to the explanations regarding Figure 2For this purpose, a cutting solution of the log 1 is determined before the profiling of at least one side board, wherein the side board and the log profile are curved and the log is moved against the milling tools in a first machining position and, during the profiling of the side board, is moved from the first machining position to a second machining position in which the log axis and / or the side board is oriented parallel to the feed direction 9 in a region which lies behind at least one of the profiling tools 5 with respect to the feed direction. The side board 4 is profiled according to the cutting solution by advancing the two milling tools 5 along their feed axes 8 during the profiling of the side board 4.

[0091] As shown in view d) of the Figure 3As can be seen, the side boards are separated from the main boards by the recutting process, and the main boards are simultaneously divided into several main boards.

[0092] Figure 4 shows to better illustrate the Figure 1 The described advantages involve two tree trunks 1, 1' which are moved successively in the feed direction 9 against two milling tools 5. As demonstrated by Figure 4 As shown, the tree trunks 1, 1' differ from each other in the orientation of the nominal extension axes 7 of the side boards 4 to be profiled relative to the respective trunk axes 7.

[0093] In a conventional profiling of the sideboards 4 shown here, the logs 1, 1' with their respective trunk axes 7 would be oriented parallel to the feed direction 9, which would mean that the milling tools 5 would have to cover comparatively long infeed distances both before and during milling, as described above.

[0094] However, if the tree trunks are 1.1', they are cut according to the instructions. Figure 1 each brought into a processing state which in Figure 4 As shown, and where the target extension axes 6 are oriented essentially parallel to the feed direction 9, the aforementioned feed paths can be completely or almost completely avoided, and the gap between the logs 1 can be reduced to a minimum. The explanations regarding Figure 1 accordingly.

[0095] Figure 5 View a) shows a tree trunk 1, which, unlike tree trunk 1 according to the Figures 1 to 4 not merely for the production of one sideboard 4, but of two sideboards 4, 4' located on opposite sides of the log 1. The log 1 can be referred to as the model.

[0096] According to view a) of the Figure 5The log 1 has two processing surfaces, one of which, the first processing surface 2, is shown and labeled with a reference symbol, while the second processing surface faces away from the image plane and, for clarity, is not labeled with a reference symbol. The first processing surface 2 serves to produce a first side board 4, whose target extension axis 6 is located with respect to the image plane. Figure 5 The second processing surface, located below the log 1 in the direction of the first processing surface 2, serves to produce a second sideboard 4', whose intended extension axis 6' is perpendicular to both the log axis 7 and the intended extension axis 6 of the first sideboard 4. An angle bisector 15 extends between the intended extension axis 6 of the first sideboard 4 and the intended extension axis 6' of the second sideboard 4'.

[0097] The milling tools 5 are used to profile the first side board 4, and the milling tools 5' are used to profile the second side board 4'. The milling tools 5 and 5' are offset from each other along a vertical axis that is orthogonal to the image plane. Contrary to the representation in Figure 5 In the arrangement shown, the milling tools 5, 5' can be arranged at the same height along the feed axis and offset from each other only along the aforementioned height axis, which runs orthogonally to the plane of the image. The milling tools 5' can be moved along their respective infeed axes 8', corresponding to the milling tools 5. For clarity, the milling tools 5 and 5' are shown at different infeed positions, but can, in principle, be in any infeed position before machining the log 1.

[0098] To bring tree trunk 1 into a processing position, it is, according to the instructions for the Figures 1 to 4 , rotated about an axis of rotation. The rotation occurs such that the log 1 is oriented with the angle bisector 15 parallel to the feed direction 9 and is moved in this position against the milling tools 5. In the machining position of the log 1, which is shown in view b) of the Figure 5 As shown, the nominal extension axes 6, 6' of the side boards 4 and 4' respectively, as well as the trunk axis 7, are not oriented parallel to the feed direction 9. This is shown in view b) of the Figure 5 shown.

[0099] Studies have shown that the [unclear] in view b) of the Figure 5The orientation of a log 1 shown is advantageous if the nominal extension axes 6, 6' of two side boards 4 and 4' respectively are oriented at angles to each other. By aligning the log 1 along the angle bisector 15, it is possible to move it against the milling tools 5, 5' and to optimize the required feed paths before and during milling.

[0100] When the log is moved against the milling tools 5, 5' in the processing position shown here, these tools engage with the corresponding side board 4, 4' to be profiled. If the side boards 4, 4' are to be profiled according to the target extension axes 6, 6' shown here, the milling tools must be adjusted along their respective feed axes 8. This results in a good wood yield.

[0101] However, investigations have shown that it can be advantageous to profile the side boards 4, 4' with a deviation from their nominal extension axes 6, 6'. This is possible, for example, by bringing the log 1 into the processing position shown in view c) of the Figure 5 The milling tools are shown in the figure and are positioned as shown before milling. However, no adjustment of the milling tools 5, 5' occurs during milling. This results in the side boards being profiled with an actual axis of extension that exhibits an angular deviation from the respective target axis of extension 6, 6', as indicated.

[0102] While such an angular deviation does lead to a reduction in timber yield, it can be accepted from an economic perspective in order to reduce the timber shortage and the associated increase in plant productivity. Favorable circumstances in this regard include, for example, low timber prices or the need to minimize inventory in a wood processing plant.

[0103] Figure 6 View a) shows a tree trunk 1, which, according to the descriptions in view a), Figure 1The log is moved in the feed direction 9 by means of a plurality of conveyor rollers 10 to profile a sideboard 4. The log has at least one processing surface 2 and two adjacent bark edge areas 3. The intended extension axis 6 of the sideboard 4 extends parallel to the log axis 7, but is offset parallel to the log axis 7 in a plane formed by the processing surface 2.

[0104] To bring tree trunk 1 into the processing position shown in view b) of the Figure 6As shown, the log 1 is adjusted by means of the conveyor rollers 10 along an adjustment axis that runs transversely to the feed direction and moved in this machining position against the milling tools 5. Before the milling tools 5 engage the log 1, they are each moved along their feed axis 8. The movement of the log 1 and the milling tools 5 results in a counter-rotating motion, which means that the milling tools 5 have to travel shorter feed paths compared to a conventional feed.

[0105] Figure 7 shows, similar to Figure 4Two logs 1, separated by a gap in the wood, are moved against two milling tools 5. The logs 1 are to be processed in such a way that at least one side board 4 is profiled on each. The intended extension axes 6 of both logs 1 are offset parallel to the respective log axis 1. To reduce the gap in the wood, the logs 1 are, according to the above instructions, Figure 6 , translationally shifted, thereby reducing the feed of the milling tools 5 before milling and eliminating the need for any feed during milling.

Claims

1. A method for producing sawn timber from a tree trunk (1), wherein at least one machining surface (2) is created on the tree trunk (1) by removing a slab area, and wherein the tree trunk (1) is moved in a feed direction (9) against at least two milling tools (5), each of which can be moved along a feed axis (8), whereby two wane areas (3) adjacent to the machining surface (2) are milled out and at least one side board (4) is profiled, and wherein the side board (4) is separated from the tree trunk (1) by a saw cut. characterized by the fact thatThe log (1) is moved from a transport position to a processing position during the feed movement and before the side board is profiled, by moving the log around and / or along at least one adjustment axis which runs orthogonally to the feed direction (9) and thereby displacing at least a leading area of ​​the log (1) transversely to the feed direction (9) in the direction of at least one of the milling tools (5).

2. The method according to claim 1, wherein at least two logs (1, 1') are moved successively in the feed direction and a side board is profiled on each of the two logs (1, 1') by means of the at least one milling tool, wherein during the profiling of the side board of a first log (1') the milling tool is advanced along its feed axis and before the profiling of the side board of a second log (1), the second log is brought from the transport position to the processing position by moving the log around and / or along the adjustment axis, which runs orthogonally to the feed direction (9) and thereby displacing the leading area of ​​the second log (1) transversely to the feed direction (9) in the direction of the milling tool (5), wherein the milling tool is preferably not advanced.while the milling tool is located in a gap in the wood between the first log (1') and the second log (1).

3. A method at least according to claim 1, wherein at least two logs (1, 1') are moved successively in the feed direction and a side board is profiled on each of the two logs (1, 1') by means of the at least one milling tool, wherein after the profiling of the side board of a first log (1') the milling tool is advanced along its feed axis, and the second log (1) is brought into the processing position by moving the log about and / or along the adjustment axis, which runs orthogonally to the feed direction (9) and thereby displacing the leading area of ​​the second log (1) transversely to the feed direction (9) in the direction of the milling tool (5), in particular opposite to the feed of the milling tool (5), wherein the milling tool is preferably advanced while the milling tool is located in a gap in the wood between the first log (1') and the second log (1).

4. Method according to one of the preceding claims, wherein the log (1) is brought into the machining position by rotating it about an axis of rotation which is orthogonal to the feed direction (9) and at least one of the milling tools (5) is moved along its respective feed axis (8) which is orthogonal to the feed direction (9) of the log (1) and the axis of rotation.

5. Method at least according to claim 4, wherein, prior to profiling the at least one side board (4), a cutting solution of the log (1) is determined, which comprises a substantially straight side board profile on the log (1), which is in particular oriented at an angle to a log axis, and the log (1) is rotated about the axis of rotation such that a target extension axis (6) of the side board (4) is oriented parallel to the feed direction (9) in the processing position of the log (1), and wherein the side board (4) is profiled according to the cutting solution by moving the log in the processing position against at least one of the milling tools and the milling tool is stationary with respect to its feed axis during the profiling of the side board (4).

6. Method at least according to claim 4, in which, prior to profiling the at least one side board, a cutting solution of the log (1) is determined which comprises a substantially straight side board profile on the log (1), which is in particular oriented at an angle to a log axis, and the log (1) is rotated around the axis of rotation such that a target extension axis (6) of the side board (4) is oriented non-parallel to the feed direction (9) in the processing position.

7. Method at least according to claim 6, wherein the side board (4) is profiled according to the cutting solution by positioning at least one of the milling tools (5) along its feed axis (8) during the profiling of the side board (4) or wherein the side board (4) is profiled in a manner deviating from the cutting solution, wherein at least one of the milling tools (5) is stationary with respect to its feed axis during the profiling of the side board (4).

8. Method at least according to claim 4, wherein the milling tools (5) are each designed as rotating milling heads, the axes of rotation of which enclose an acute angle with a plane that is oriented orthogonally to the feed direction (9), which is in particular fixed.

9. A method according to any one of claims 1 to 8, wherein two processing surfaces (2) facing in opposite directions are produced on the log (1) by removing two bark areas, and the log (1) is moved in a feed direction (9) against at least four milling tools (5, 5') and four wane edge areas (3) adjacent to the processing surfaces are milled out, thereby profiling two side boards on the log (1) and wherein two side boards (4, 4') are separated from the log by two saw cuts, wherein the log (1) is moved from the transport position to the processing position during the feed movement and before the side boards (4, 4') are profiled, by moving the log (1) about and / or along the adjustment axis and thereby at least the leading area of ​​the log (1) transversely to the feed direction (9) in the direction of at least two of the milling tools (5, 5'). is being relocated.

10. Method according to claim 9, in which, prior to profiling the longitudinal sides of the sideboards (4, 4'), a cutting solution of the log (1) is determined, which comprises two substantially straight, non-parallel sideboard profiles along each of a desired longitudinal extension axis (6, 6'), and the log (1) is rotated about an axis of rotation which is orthogonal to the feed direction such that, in the processing position, the desired extension axes (6, 6') of the sideboards define an angular range which includes the feed direction (9), wherein, in particular, the feed direction (9) is oriented parallel to an angle bisector between the desired longitudinal extension axes (6, 6').

11. Method at least according to claim 10, wherein the log (1) is processed according to the cutting solution and the side boards (4, 4') are produced according to the desired extension axes by supplying at least two milling tools, which serve to profile different side boards (4, 4'), along their respective feed axes (8) during the milling of the log.or in which the log (1) is processed by means of the milling tools (5, 5') in a manner deviating from the cutting solution, in that at least two milling tools, which serve to profile different side boards (4, 4'), are stationary along their respective feed axes during the feed movement of the log (1) and the side boards (4, 4') are each produced with an actual longitudinal extension axis which has an angular deviation from the respective nominal longitudinal extension axes, wherein the angular deviation corresponds in particular to half the angle between the nominal longitudinal extension axes (6, 6') of the side boards (4, 4').

12. Method according to any one of claims 1 to 11, wherein the log (1) is at least partially repositioned by moving it along a translation axis which is orthogonal to the feed direction, and in particular orthogonal to the rotation axis, wherein, in particular, before profiling the at least one side board (4), a cutting solution of the log is determined which includes a side board profile on the log (1), wherein a target extension axis (6) of the side board (4) runs substantially parallel to a trunk axis (7) and the log is brought into the processing position by moving the log with its target extension axis along the translation axis depending on a preceding log (1').

13. Method at least according to claim 1, wherein the log (1) is moved in the feed direction by means of a plurality of conveying roller pairs, of which at least two conveying roller pairs are arranged spaced apart from each other along the feed direction, and the log is brought into the processing position by displacing at least one of the conveying roller pairs relative to the other conveying roller pair and / or displacing the at least two conveying roller pairs together transversely to the feed direction.

14. Method for producing sawn timber from a tree trunk (1), in particular at least according to claim 1, in which at least one processing surface (2) is produced on the tree trunk (1) by removing a slab area and in which the tree trunk (1) is moved in a feed direction (9) against at least two milling tools (5), each of which can be positioned along a feed axis (8), whereby two wane edge areas (3) adjacent to the processing surface (2) are milled out and at least one side board (4) is profiled and in which the side board (4) is separated from the tree trunk (1) by a saw cut. characterized by the fact thatBefore profiling the at least one side board, a cutting solution of the log (1) is determined which includes a side board profile on the log (1), and the log (1) is moved in a first machining position against the milling tools and during the profiling of the side board (4) is brought from the first machining position to a second machining position by rotating the log (1) about a axis of rotation which is orthogonal to the feed direction and wherein the side board (4) is profiled according to the cutting solution by feeding the two milling tools (5) along their feed axes (8) during the profiling of the side board.

15. Device for producing sawn timber from a tree trunk (1), in particular by means of a method according to any one of claims 1 to 14, comprising a separating means configured to separate a slab from a tree trunk (1) and to produce at least one processing surface (2), comprising a conveying means configured to move the tree trunk (1) along a feed direction (9), comprising at least two milling tools (5) arranged such that the tree trunk (1) is moved against the milling tools (1) during the feed movement and two bark edge areas adjacent to the processing surface are milled out, thereby profiling the longitudinal sides of a side board (4), and comprising a sawing means configured to separate the side board (4) from the tree trunk (1). characterized by the fact thatthe conveying means is designed to adjust the log (1) around and / or along at least one adjustment axis which runs orthogonally to the feed direction and thereby at least a leading area of ​​the log can be displaced transversely to the feed direction.

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