Sawmill plant for cutting up round timber

Abstract

Sawmill plant for cutting up round timber (14), comprising a plurality of processing stations (16, 18, 20, 22), a conveyor system (24), and a control unit (26) configured to control the plurality of processing stations (16, 18, 20, 22) and the conveyor system (24) to cut up a round timber (14) with a defined sequence (12) of processing steps, wherein the plurality of processing stations (16, 18, 20, 22) comprises a first double circular saw (16) and a first double band saw (18), wherein the first double circular saw (16) has a first circular saw blade (42) with a first axis of rotation (44) and a second circular saw blade (46) with a second axis of rotation (48) arranged parallel to the first axis of rotation (44), such that there is a gap between the first circular saw blade (42) and the second circular saw blade (46) a first defined gap (50) remains,wherein the first double band saw (18) has a first band saw blade (56) with a first saw line (60) and a second band saw blade (58) with a second saw line (62) which is arranged parallel to the first saw line (60), so that a second defined space (64) remains between the first saw line (60) and the second saw line (62), wherein the first and the second axes of rotation (44, 48) are arranged parallel to the first and the second saw lines (60, 62), and wherein the conveying system (24) is configured to guide the log (14) or a saw product (32) produced from the log (14) through the first space (50) relative to the first double circular saw (16) and further through the second space (64) relative to the first double band saw (18).

Description

[0001] The present invention relates to a sawmill plant for cutting up round timber, in particular for cutting up tree trunks from forestry, but also for further cutting up sawn products made from round timber such as logs and squared timber.

[0002] Sawmill systems are fundamentally well-known. They comprise one or more motor-driven saws, which can be band saws, frame saws, chainsaws, or circular saws, as well as a conveying system that feeds the logs and saw products to the saw in a defined manner and removes them from the saw. Saw products that are further processed using such a sawmill system can include, in particular, so-called cants and squared timber, which are obtained from logs through previous sawing steps. Furthermore, modern sawmill systems can include so-called profile chippers, which selectively chip areas of a log or saw product, for example, to remove the rounded bark edge of a tree trunk in certain sections and create a flat outer surface.The chips produced during machining, as well as the sawdust produced during sawing, can be used further, for example as heating or insulation material or for paper production.

[0003] For example, DE 198 28 238 A1 discloses a sawmill plant and a method with a longitudinal conveyor and two band saws. The longitudinal conveyor can be moved back and forth along its axis of movement. The band saws are arranged along the path of movement of the longitudinal conveyor and each has a band saw blade with toothed leading and trailing edges. The two band saw blades are offset from each other by the width of a board to be sawn.

[0004] EP 0 775 558 B1 discloses a method and a device for cutting up round logs, wherein at least one side board is sawn off with a band saw in such a way that part of the wane remains on the side board. During the subsequent edge processing, the side board is moved together with the core section of the round log.

[0005] EP 1 050 386 A1 discloses a method and a device for cutting up round timbers, wherein the round timbers are cut up by first and second axially extending cuts. The first cuts are made in a comb-like manner parallel to an imaginary first median plane. Subsequently, the second cuts are made parallel to an imaginary second median plane of the round timbers.

[0006] EP 1 226 910 A1 discloses a method and a device in which a log is first halved along its longitudinal axis by a first longitudinal cut. Then, opposite bark edges of the log are removed parallel to the longitudinal cut. A plurality of parallel cuts of progressively different depths are made into each of the resulting log profiles. The log profiles are then rotated about their respective longitudinal axes, and a series of further cuts are made perpendicular to and ending at the cuts of progressively different depths. In this way, boards are extracted from the log profiles.

[0007] Generally, there is a desire to process round timber and subsequent sawn products from forestry as efficiently and with as high a yield as possible. On the other hand, every tree trunk is unique, and there are varying requirements for the resulting sawn products. Existing sawmill systems can meet some of these diverse requirements well. However, there is a desire for further increases in efficiency and yield.

[0008] Against this background, it is an object of the present invention to provide an alternative sawmill plant that enables high efficiency and yield in the processing of round timber from forestry.

[0009] According to one aspect of the present invention, this problem is solved by a sawmill plant for cutting round timber, comprising a plurality of processing stations, a conveying system, and a control unit configured to control the plurality of processing stations and the conveying system in order to cut a round timber with a defined sequence of processing steps, wherein the plurality of processing stations comprises a first double circular saw and a first double band saw, wherein the first double circular saw has a first circular saw blade with a first axis of rotation and a second circular saw blade with a second axis of rotation arranged parallel to the first axis of rotation, such that a first defined gap remains between the first circular saw blade and the second circular saw blade.wherein the first double band saw has a first band saw blade with a first saw line and a second band saw blade with a second saw line, which is arranged parallel to the first saw line, so that a second defined space remains between the first saw line and the second saw line, wherein the first and the second axes of rotation are arranged parallel to the first and second saw lines, and wherein the conveying system is configured to guide the log or a sawn product made from the log through the first space relative to the first double circular saw and further through the second space relative to the first double band saw,

[0010] The new sawmill system combines at least one double circular saw and at least one double band saw with a conveying system that feeds the log to be cut and the resulting sawn product sequentially to both the double band saw and the double circular saw. The log can therefore be cut using the two different types of saws. In preferred embodiments, which are explained below, an initial log is sawn alternately first with the double band saw, then with the double circular saw, and then again with the double band saw. Accordingly, the conveying system of the new sawmill system is configured to feed an initial log and the resulting sawn products alternately to a double band saw and a double circular saw.

[0011] The double band saw and the double circular saw each have (at least) two saw blades arranged at a lateral distance perpendicular to the feed direction of the conveyor system, so that a log or sawn product is fed between the spaced-apart saw blades (twin arrangement). This makes it possible to perform parallel saw cuts on opposite sides of the log or sawn product. In preferred embodiments, the spaced-apart saw blades are arranged opposite each other with respect to the feed direction, i.e., they are in the same position relative to the feed direction of the log / sawed product and engage the log / sawed product practically simultaneously. The respective saw cuts can therefore be performed temporally and spatially parallel to each other on opposite sides of a log / sawed product.This alone contributes to the high productivity and efficiency of the new plant.

[0012] Furthermore, the saw lines of the double band saw, where the rotating band saw blade engages with the wood, and the rotation axes of the double circular saw are truly parallel, meaning they are parallel to each other but laterally offset (and therefore not coaxial). As a result, the saw kerf of the double band saw and the saw kerf of the double circular saw are perpendicular to each other. This also contributes to the highly efficient sawing of squared timber and boards with a rectangular cross-sectional profile from round timber.

[0013] A (double) band saw allows for narrower kerf cuts and thus a higher yield than a (double) circular saw. A circular saw blade, on the other hand, is more stable and particularly suitable for long, straight cuts in a horizontal plane. In preferred embodiments, the parallel cutting lines of the double band saw and the axes of rotation of the double circular saw run vertically. In these embodiments, vertical cuts in the log and sawn product are therefore always made with the double band saw, while horizontal cuts are made with the double circular saw. The latter contributes to high cutting accuracy. Furthermore, a (double) circular saw requires less space than a (double) band saw.

[0014] The new sawmill combines the two sawing technologies in a highly advantageous way, thus enabling high efficiency and yield. The aforementioned task has been completely solved.

[0015] In a preferred embodiment of the invention, the conveyor technology defines a processing direction that corresponds, at least in sections, to the defined sequence of processing steps, wherein the first double circular saw is arranged upstream of the first double band saw in the processing direction. In preferred embodiments, the first double circular saw and the first double band saw are arranged in a straight line and preferably directly one behind the other, so that a sawn product can pass through the first double circular saw and the first double band saw in a straight line and immediate succession.

[0016] The design contributes particularly advantageously to high efficiency, even though the double band saw is very well suited to removing side boards with wane in a first sawing step before the main product is cut up using the double circular saw and the double band saw.

[0017] In a further embodiment, the sawmill system includes a second double circular saw and a second double band saw, which are arranged behind the first double band saw in the machining direction, wherein the second double band saw is arranged behind the second double circular saw in the machining direction.

[0018] This design contributes to even greater efficiency, as it facilitates the multi-section processing of the main product of a log in a single pass. Furthermore, several logs can be processed simultaneously using this design, enabling particularly high utilization of the processing stations.

[0019] In a further embodiment, the conveyor technology has a return path that begins behind the first double band saw in the machining direction and ends in front of the first double circular saw, with the conveyor technology being designed to transport the sawn product to the first double circular saw using the return path.

[0020] This design makes it possible to use the double band saw to remove the side boards and then transport the resulting model to the beginning of the production line, i.e., to the log infeed area. This design contributes significantly to the efficient operation of the processing stations.

[0021] In a further embodiment, the sawmill system includes a turning device configured to rotate the sawn product about a longitudinal axis, the turning device being arranged downstream of the first double band saw in the processing direction. Preferably, the turning device includes a turning ring in which the sawn product is rotated 90° about its longitudinal axis.

[0022] This design also contributes advantageously to a very efficient operation of the processing stations, especially in combination with a second double circular saw and a second double band saw, which can be used with the help of the turning device both for removing side products and for cutting up the main product.

[0023] In a further embodiment, the sawmill system includes a profile chipper, which is designed to chip away sections of the wane edge of the round timber or sawn product.

[0024] This design contributes advantageously to a high yield, as the bark edge of the roundwood can be removed very precisely with the help of the profile chipper and side boards can be obtained right up to the edge of the roundwood.

[0025] In a further embodiment, the sawmill system includes a 3D measuring device designed to capture a 3D profile of the round timber or sawn product, with the 3D measuring device being arranged in the processing direction in front of the first double circular saw.

[0026] This design makes it possible to efficiently measure each saw product fed to the saws individually, in order to optimize its positioning relative to the saws. Preferably, the 3D measuring device is arranged in the processing direction upstream of the profile chipper, so that the profile chipper can also be operated based on the current, individual measurements of the saw product. Furthermore, it is preferred to arrange another 3D measuring device in the processing direction downstream of the first double band saw and upstream of the second double circular saw, because then the second double circular saw and / or double band saw can also be controlled very efficiently.

[0027] In a further embodiment, the sawmill system includes an edger which is arranged in the processing direction after the first double band saw.

[0028] Preferably, a board separator is arranged between the first double band saw and the turning device in the processing direction. This separator is designed to divert side boards with wane (wood edge) perpendicular to the processing direction and feed them to the edger. In some preferred embodiments, the edger is an edger of the Optimes or Optidrive type, or another edger commercially offered by Esterer WD GmbH, Estererstraße 12, 84503 Altötting, Germany, and Markwiesenstraße 40, 72770 Reutlingen, Germany. Such an edger increases the yield of the sawmill because it facilitates the production of boards from the side boards. Preferably, a second board separator is arranged downstream of the second double band saw in the processing direction and is operationally connected to the edger via a separate return path from the second board separator to the first board separator.

[0029] In a further embodiment, the first double band saw has a third band saw blade with a third saw line and a fourth band saw blade with a fourth saw line, which are arranged parallel to the first, second, and third saw lines. In preferred embodiments, the second double band saw also has a corresponding third band saw blade with a third saw line and a corresponding fourth band saw blade with a fourth saw line.

[0030] In this configuration, the first double band saw and, if applicable, the second double band saw are designed as quad band saws, each with four parallel band saw blades. This design enables particularly efficient operation in combination with the advantages explained above.

[0031] In a further embodiment, the control unit is designed to cut the round timber using the following sawing steps: - Two-sided cutting of side boards of round timber using the first double band saw to obtain a sawn product with a largely square cross-section in a plane parallel to the first and second saw lines, wherein the sawn product with the largely square cross-section has a product diameter perpendicular to the first and second saw lines, - Bi-sided production of a plurality of first slot joints in the sawn product with the largely square cross-section perpendicular to the plane using the first double circular saw, wherein the first slot joints each have a joint depth that is less than half the product diameter, - Two-sided cutting of the first main product parts of the round timber using the first double band saw along the first cutting lines.

[0032] Preferably, the control unit is further equipped to cut up other main parts of the round timber using the second double circular saw and the second double band saw.

[0033] In this configuration, the control unit is set up to process round timber particularly efficiently and with high yield using combined sawing technologies. This configuration makes particularly advantageous use of the existing processing stations.

[0034] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of the present invention.

[0035] Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description. They show: Fig. 1 A schematic representation of an exemplary embodiment of the new sawmill plant in a top view (upper part of Fig. 1) and with a defined sequence of processing steps (lower part of Fig. 1); Fig. 2 a schematic representation to illustrate a preferred method which is used with the sawmill plant according to Fig. 1 can be carried out advantageously; Fig. 3 a further schematic representation to explain the preferred method Fig. 2.

[0036] In Fig. Figure 1 is a sawmill plant according to an embodiment of the invention, designated in its entirety by reference numeral 10. The upper part of this figure shows... Fig. 1. The sawmill plant 10 in a top view. The lower part of Fig. Figure 1 shows a preferred sequence 12 of processing steps with which a round timber 14, such as a tree trunk, but also model timber or squared timber, can be cut up using the sawmill system 10. Identical reference symbols denote identical elements.

[0037] The sawmill plant 10 has a plurality of processing stations, comprising a first double circular saw 16 and a first double band saw 18, and preferably a second double circular saw 20 and a second double band saw 22. Further advantageous processing stations are described below with reference to the preferred sequence 12 of processing steps according to Fig. 1 explained.

[0038] The sawmill system 10 further includes a conveying system 24 and a control unit 26. In preferred embodiments, the conveying system 24 includes roller conveyors with several electrically driven rollers and / or conveyor belts 28, as well as discharge ramps and ejectors 30, with which a sawn product 32 can be moved transversely to a roller conveyor. With the aid of the conveying system 24, round timber 14, which is initially fed to the sawmill system 10 at a feed station 34, can be processed very efficiently using the defined sequence 12 of processing steps. Sawn products such as, in particular, a model 36, boards 38, planks 30, or squared timber, and also wood chips and sawdust (not shown here) are produced from the initially fed round timber 14.However, the sawmill system 10 is not limited to cutting round logs and can equally be used to further cut initially fed logs, squared timber, or planks. Accordingly, cutting a round log 14 is a preferred, but not the only, use of the sawmill system 10.

[0039] In this embodiment, the control unit 26 includes a control panel from which an operator of the sawmill 10 can monitor and control the processing stations 16, 18, 20, 22 and the conveyor system 24. The control panel 26 can include one or more video monitors on which the operator can see the processing stations 16, 18, 20, 22 and the conveyor system 24 in real time. In preferred embodiments, the control unit 26 is configured to automatically control the processing stations 16, 18, 20, 22 and the conveyor system 24, while the operator can manually intervene in the sequence 12 of processing steps via the control panel, for example, to select a log to be cut, to correct a processing position of the log or sawn product, and / or to stop a station.

[0040] As in the upper part of Fig. As shown in Figure 1, the processing stations 16, 18, 20, 22 are arranged spatially along a straight line in this embodiment. In other embodiments, the stations can be arranged along several lines, which are connected, for example, by transverse conveyors, or, for example, along an arc. Advantageously, the spatial arrangement of the processing stations 16, 18, 20, 22 corresponds, at least partially, to the preferred sequence 12 of processing steps, and the conveyor system 24 transports a log 14 to be cut and sawn products made from it along a defined processing direction 40, which corresponds, at least partially, to the sequence 12 of processing steps.

[0041] The first double circular saw 16 and the second double circular saw 20 each have a plurality of circular saw blades, which are preferably of the same type and in particular have the same saw blade diameters and similar saw blade teeth. As in Fig. As shown in Figure 2, the first double circular saw 16 has a first circular saw blade 42, which rotates about a first axis of rotation 44, and a second circular saw blade 46, which rotates about a second axis of rotation 48. The two axes of rotation 44 and 48 are truly parallel to each other, i.e., parallel but not coincident, and are accordingly arranged with a lateral distance from each other, so that a gap 50 remains between the first circular saw blade 42 and the second circular saw blade 46, transverse to the machining direction 40. The conveying system 24 is configured to convey a sawn product 32 into the gap 50 in order to produce slotted joints 52 on both sides, i.e., opposite longitudinal sides of the sawn product 32, using the first double circular saw 16.In preferred embodiments, the first and second circular saw blades 42, 46 are arranged in a common plane 54, so that the slot joints 52 are produced symmetrically to each other on opposite longitudinal sides of the sawn product 32. In some preferred embodiments, the circular saw blades 42, 46 rotate in opposite directions, as shown in . Fig. 2 is indicated.

[0042] Preferably, the first double circular saw 16 has a plurality of first and second circular saw blades 42, 46 on both sides of the gap 50 in order to produce a corresponding plurality of parallel slot grooves 52 on both sides of the sawn product 32 in a single operation. However, in other embodiments, it is possible to produce a corresponding plurality of two-sided, opposing slot grooves 52 in several successive machining steps. In some embodiments, the plurality of first circular saw blades 42 are arranged on a common first shaft, and the plurality of second circular saw blades 46 are arranged on a common second shaft. Preferably, the common plane 54 of the opposing circular saw blades 42, 46 is a horizontal plane, and the first and second circular saw blades 42, 46 are accordingly arranged at the same height.Preferably, the circular saw blades opposite each other in the machining direction 40 are arranged in the same position along the machining direction 40. In principle, however, the common plane 54 could be inclined relative to a horizontal plane and / or the circular saw blades 42, 46 could be arranged offset from each other along the machining direction 40.

[0043] In preferred embodiments, the first double circular saw 16 is configured to adjust the position and / or orientation of the circular saw blades 42, 46 relative to a saw product 32 individually and / or jointly. Advantageously, the control unit 26 is configured to adjust the lateral distance between the axes of rotation 44, 48, and thus the width of the gap 50, depending on the diameter of a saw product 32, in order to individually adjust, in particular, the depth of the slot joints 52 perpendicular to the machining direction 40. In preferred embodiments, the first double circular saw 16 and the second double circular saw 20 are of the same type. It is particularly advantageous for the first double circular saw 16 and the second double circular saw 20 to be circular saws such as those offered by Esterer WD GmbH, Estererstraße 12, 84503 Altötting, Germany, and Markwiesenstraße 40, 72770 Reutlingen, Germany, as horizontal circular saws FVHTK.

[0044] The first and second double band saws 18, 22 each have a first band saw blade 56 and a second band saw blade 58 and are identical in the preferred embodiments. The first band saw blade 56 and the second band saw blade 58 are each clamped around an upper and a lower roller in a manner known per se and rotate around the upper and lower rollers in a defined direction of rotation. The first band saw blade 56 forms a first saw line 60 between the upper and the lower rollers, along which the first band saw blade 56 can move relative to a saw product 32 in order to saw the saw product 32. The second band saw blade 58 forms a second saw line 62 in a corresponding manner.The second saw line 62 is arranged parallel to the first saw line 60, so that a second gap 64 remains between the first saw line 60 and the second saw line 62, through which the saw product 32 can be moved relative to the rotating band saw blades 56, 58 by means of the conveyor system 24. As in . Fig. As shown in Figure 2, a sawn product 32 can therefore be sawn on two sides using the first and second band saw blades 56, 58. Preferably, the double band saws 18, 22 each have magnetic guides (not shown here) in the area of ​​the respective saw lines 60, 62 to guide the band saw blades precisely in position during sawing. In particular, the double band saws 18, 22 can each have magnetic guides as described in EP 2 379 267 B1 or in the subsequently published German patent application with the official file number 10 2025 119 570.6, which are incorporated herein by reference with regard to the details of the magnetic guides.

[0045] In preferred embodiments, the first and second double band saws 18, 22 each have a third band saw blade 66 and a fourth band saw blade 68, respectively, forming a corresponding third saw line 70 and a corresponding fourth saw line 72. The third and fourth saw lines 70, 72 are arranged parallel to the first and second saw lines 60, 62 and form a (further) gap that connects coaxially to the second gap 64 in the machining direction 40. This further gap is slightly smaller than the second gap 64 transversely to the machining direction, so that four parallel saw cuts can be made in the saw product 32 using the band saw blades 56, 58, 66, 68. In preferred embodiments, the first and second band saws 18, 22 are accordingly so-called quad reduction band saws, such as those offered commercially by the aforementioned company Esterer WD GmbH.

[0046] In the preferred embodiment according to Fig. In Figure 1, the sawmill system 10 includes a first 3D measuring device 74 and a second 3D measuring device 76. The first and second 3D measuring devices 74 and 76 are each configured to acquire 3D measurement data on a log 14 or a sawn product 32. The 3D measurement data represents the geometry and spatial dimensions of the log 14 or sawn product 32 with a spatial resolution of, for example, ± 1 mm. For example, the first and / or second 3D measuring device 74 and 76 can include one or more cameras, a laser scanner, and / or an X-ray measuring device to acquire a 3D profile of the entire log 14 or sawn product 32.Advantageously, the control unit 26 is connected to the first and second 3D measuring device 74, 76 and receives the corresponding measurement data from the first and second 3D measuring device 74, 76 in order to control the sawing stations 16, 18, 20, 22 and the other processing stations explained below, depending on the individual measurement data.

[0047] The first 3D measuring device 74 is advantageously arranged in the area of ​​the feed station 34, so that the control unit 26 receives the individual 3D measurement data of a round timber 14 to be cut up before the next processing steps are carried out in the sequence 12.

[0048] Reference numeral 78 here designates a first alignment device. Advantageously, the control unit 26 is configured to align a log 14 or sawn product 32 using the first alignment device 78 and depending on the 3D measurement data from the 3D measuring device 74, and to position it optimally for subsequent processing. In particular, a log 14 can be centered, diagonally, or with a parallel displacement to the central axis of the sawmill system 10 or the subsequent processing stations, depending on its curvature and shape, using the alignment device 78. For this purpose, the alignment device can have one or more pairs of rollers and / or sliding mechanisms (not shown in detail here). A second alignment device downstream of the first alignment device is designated by reference numeral 80.

[0049] Reference numeral 82 designates a first profile chipper. Reference numeral 84 designates a second profile chipper. The profile chippers 82 and 84 are each configured to selectively chip and thus remove a section of the wane edge of the roundwood 14 or sawn product 32 in the form of a blank. In this embodiment, the profile chippers 82 and 84 are specifically configured to produce two plane-parallel lateral surfaces on the roundwood 14 or blank 32.

[0050] Reference numeral 86 designates a first board separator. Reference numeral 88 designates a second board separator. The first board separator 86 is arranged in the processing direction 40 directly after the first double band saw 18 and is configured to separate side boards 90 that have been sawn by the double band saw 18. The first board separator 86 conveys the boards 90 to an edger 92 by means of the conveyor system 24. Advantageously, in this embodiment, the side boards 90 are conveyed to the edger 92 transversely and, in particular, orthogonally to the processing direction 40. The edger 92 is configured to remove any remaining wane from the boards 90 in a manner known per se.In this embodiment, the second board separator 88 is arranged directly after the second double band saw 22 and is configured to feed side boards 100, which have been sawn by the double band saw 22, to a first return path 94 of the conveyor system 24. In this embodiment, the return path 94 preferably conveys the side boards 100 to the area of ​​the first board separator 86, so that they can then be conveyed from there to the edger 92.

[0051] Reference numeral 96 of the conveyor system 24 designates a second return path. This second return path 96 is configured to return a sawn product 32, which remains after the side boards 100 have been removed by the second double band saw 22, back to the first double circular saw 16. This allows the sawn product to be further processed using the first double circular saw 16, the first double band saw 18, and the subsequent processing stations. Preferably, the second return path 96 conveys the sawn product 32 to the first 3D measuring device 74, so that the sawn product can be measured again before further processing using the first double circular saw 16 and the first double band saw 18. The control unit 26 is advantageously configured to control the first double circular saw 16 and the first double band saw 18 based on the measurement data currently received from the 3D measuring device 74.

[0052] Reference numeral 98 denotes a turning device, which may be designed in particular as a so-called turning ring. The turning device 98 is configured to rotate a sawn product, obtained after the removal of side boards 90 using the first double band saw 18, around its longitudinal axis (parallel to the processing direction 40).

[0053] In preferred embodiments, the control unit 26 is configured to cut a log 14 according to the sequence 12 with the following processing steps. First, the log 14 is measured using the 3D measuring device 74. Advantageously, a 3D profile of the log 14 is determined along its longitudinal axis using the 3D measuring device 74. Preferably, the log 14 is aligned and positioned on the conveyor system for subsequent processing based on the obtained 3D profile using the first alignment device 78. Then, two opposite bark edges of the log are removed using the profile chipper 82, based on the obtained 3D profile.

[0054] In the next step, the sawn product is conveyed through the first double circular saw 18 without the first double circular saw 16 performing a saw cut. This is in the lower part of the Fig. 1 shown by means of a cross between the profile chipper 82 and the double band saw 18 following in the machining direction 40.

[0055] The control unit 26 controls the double band saw 18 depending on the 3D profile of the round timber 14 and the previously performed processing step with the profile chipper 82, such that the first side boards 90 are sawn. In the preferred embodiments, the four mutually parallel band saw blades 56, 58, 66, 68 (see Figure 1) are used to cut the logs. Fig. 2) Four side boards 90 are cut off. Each of the four side boards 90 still has a bark edge and is guided to the edger 92 by the first board separator 86 to remove the remaining bark edge. The boards obtained in this way are so-called side boards, which are used in Fig. 2 is indicated by reference numeral 102.

[0056] The Model 36 is rotated about its longitudinal axis by means of the turning device 98 and preferably fed to the second 3D measuring device 76 by means of the conveyor system 24. The second 3D measuring device 76 is capable of capturing a 3D profile of the Model 36. The control unit preferably aligns the Model 36 according to the previously captured 3D profile and positions the Model 36 for subsequent processing with the second profile chipper 84. With the aid of the second profile chipper 84, the opposite wane edges of the Model 36 are partially removed, or the surfaces perpendicular to the cut edges of the Model 36 are flattened. Subsequently, further side boards 100 are sawn with the aid of the second double band saw 22 (preferably without the double circular saw 20 performing a saw cut) and conveyed to the edger 92 with the aid of the second board separator 88 and the first return path 94.

[0057] The sawn product 32 at the exit of the second double band saw 22, after the removal of the side boards 90, 100, comprises the main product of the original round timber and has a largely square cross-section. In this embodiment, this sawn product with the main product is conveyed back to the input side of the sawmill 10 by means of the second return path 96. Preferably, a 3D profile of the sawn product with the main product is captured by means of the first 3D measuring device 74, and the sawn product is aligned and positioned by means of the first alignment device 78.

[0058] The main product can then be cut into multi-stem pieces using the first and second double circular saws 16, 20 and the first and second double band saws 18, 22. As in Fig. 2 and Fig. As shown in Figure 3, a plurality of slotted joints 52 are preferably produced on the opposite longitudinal sides of the sawn product using the first double circular saw 16 to cut the main product. The slotted joints 52 preferably have a joint depth that is less than half the diameter of the sawn product. Preferably, the slotted joints 52 are produced with a joint depth that is equal to or only slightly greater than twice the thickness of the (first) main product boards 104, which are sawn in the subsequent sawing step using the first double band saw 18. The first main product boards 104 are advantageously separated from the remaining main product using the first board separator 86 and fed to the edger 92. In a similar manner, the remaining part of the main product is cut using the second double circular saw 20 and the second double band saw 22 ( Fig.3) In this case too, the double circular saw is used to advantageously produce 20 slot joints with a joint depth that corresponds to approximately twice the thickness of the main product boards.

[0059] The double circular saws 16 and / or 20 can also be used to cut extra-wide side boards before the double band saws 18 and / or 22 are used. Subsequently, the extra-wide side boards can be cut using the double band saws 18 and / or 22, separated via the board separators 86 and / or 88, and conveyed to the edger 92. Reference symbol list 10 sawmill plant 12 Sequence of processing steps 14 round timber 16 first double circular saw 18 first double band saw 20 second double circular saw 22 second double band saw 24 Conveyor technology 26 Control unit 28 roller conveyors 30 ejectors 32 saw product 34 Supply station 36 Model 38 boards 40 Processing direction 42 first circular saw blade 44 first axis of rotation 46 second circular saw blade 48 second axis of rotation 50 first space 52 slot joint 54 common level 56 first bandsaw blade 58 second bandsaw blade 60 first saw line 62 second saw line 64 second space 66 third bandsaw blade 68 fourth bandsaw blade 70 third saw line 72 fourth saw line 74 first 3D measuring device 76 second 3D measuring device 78 first alignment device 80 second alignment device 82 first profile chipper 84 second profile chipper 86 first board separator 88 second board separator 90 side panel 92 edgers 94 first return path 96 second return path 98 Turning device 100 side boards with live edge 102 side pieces 104 main product boards QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 198 28 238 A1

[0003] EP 0 775 558 B1

[0004] EP 1 050 386 A1

[0005] EP 1 226 910 A1

[0006] EP 2 379 267 B1

[0044]

Claims

[1] Sawmill plant for cutting up round timber (14), comprising a plurality of processing stations (16, 18, 20, 22), a conveying system (24), and a control unit (26) configured to control the plurality of processing stations (16, 18, 20, 22) and the conveying system (24) to cut up a round timber (14) with a defined sequence (12) of processing steps, wherein the plurality of processing stations (16, 18, 20, 22) comprises a first double circular saw (16) and a first double band saw (18), wherein the first double circular saw (16) has a first circular saw blade (42) with a first axis of rotation (44) and a second circular saw blade (46) with a second axis of rotation (48) arranged parallel to the first axis of rotation (44), such that between the first circular saw blade (42) and the second circular saw blade (46) a first defined gap (50) remains,wherein the first double band saw (18) has a first band saw blade (56) with a first saw line (60) and a second band saw blade (58) with a second saw line (62) which is arranged parallel to the first saw line (60), so that a second defined space (64) remains between the first saw line (60) and the second saw line (62), wherein the first and the second axes of rotation (44, 48) are arranged parallel to the first and the second saw lines (60, 62), and wherein the conveying system (24) is configured to guide the log (14) or a saw product (32) produced from the log (14) through the first space (50) relative to the first double circular saw (16) and further through the second space (64) relative to the first double band saw (18). [2] Sawmill plant according to claim 1, wherein the conveying technology (24) defines a processing direction (40) which corresponds at least sectionally to the defined sequence (12) of processing steps, and wherein the first double circular saw (16) is arranged in the processing direction (40) in front of the first double band saw (18). [3] Sawmill plant according to claim 2, further comprising a second double circular saw (20) and a second double band saw (22) arranged in the processing direction (40) behind the first double band saw (18), wherein the second double band saw (22) is arranged in the processing direction (40) behind the second double circular saw (20). [4] Sawmill plant according to claim 2 or 3, wherein the conveying technology (24) has a return path (96) which starts in the processing direction (40) behind the first double band saw (18) and ends in front of the first double circular saw (16), wherein the conveying technology (24) is configured to convey the saw product (32) to the first double circular saw (16) by means of the return path (96). [5] Sawmill plant according to one of claims 2 to 4, further comprising a turning device (98) which is configured to turn the sawn product (32) about a longitudinal axis, wherein the turning device (98) is arranged in the processing direction (40) after the first double band saw (18). [6] Sawmill plant according to one of claims 2 to 5, further comprising a profile chipper (82, 84) which is equipped to chip a section of the wane edge of the round timber (14) or sawn product (32). [7] Sawmill plant according to one of claims 2 to 6, further comprising a 3D measuring device (74, 76) which is configured to capture a 3D profile of the round timber (14) or sawn product (32), wherein the 3D measuring device (74, 76) is arranged in the processing direction (40) in front of the first double circular saw. [8] Sawmill plant according to one of claims 1 to 7, further comprising an edger (92) which is arranged in the processing direction (40) after the first double band saw (18). [9] Sawmill plant according to any one of claims 1 to 8, wherein the first double band saw (18) has a third band saw blade (66) with a third saw line (70) and a fourth band saw blade (68) with a fourth saw line (72) arranged parallel to the first, second and third saw line (60, 62, 70). [10] Sawmill plant according to any one of claims 1 to 9, wherein the control unit (26) is configured to cut the log (14) using the following sawing steps: - Two-sided cutting of side boards of the round timber (14) using the first double band saw (18) to obtain a saw product (32) with a largely square cross-section in a plane parallel to the first and second saw lines (60, 62), wherein the saw product (32) with the largely square cross-section has a product diameter perpendicular to the first and second saw lines (60, 62), - Two-sided production of a plurality of first slot joints (52) in the sawn product (32) having a largely square cross-section perpendicular to the plane using the first double circular saw (16), wherein the first slot joints (52) each have a joint depth that is less than half the product diameter, - two-sided cutting of first main product parts (104) of the round timber (14) using the first double band saw (18) along the first cutting lines (52). [11] Sawmill plant according to claim 10, wherein the control unit (26) is further configured to cut further main product parts (104) of the round timber (14) using the second double circular saw (20) and the second double band saw (22).

Images