EP1592538A1

EP1592538A1 - Method and processing line for dissecting logs

Info

Publication number: EP1592538A1
Application number: EP04704193A
Authority: EP
Inventors: Christof Riebelmann
Original assignee: Esterer WD GmbH and Co
Current assignee: Gebrueder Linck GmbH and Co KG Gatterlinck Maschinen Fabrik
Priority date: 2003-01-30
Filing date: 2004-01-22
Publication date: 2005-11-09
Also published as: RU2005127096A; RU2357855C2; WO2004067238A1

Abstract

Disclosed are a method and a processing line for dissecting logs (70) into wood products (88, 92, 96) that are machined on all sides. The logs (70) are dissected into a central part (80) and outer parts (82) by means of saw cuts (78) that are performed parallel to a first central longitudinal plane (72) with the aid of a first saw. The outer parts (82) are then dissected into wood products (88) by means of second saw cuts (86) executed by a second saw which is placed downstream of the first saw. The second saw cuts (86) are performed parallel to a second central longitudinal plane (73) which extends substantially at a right angle from the first central longitudinal plane (72). The outer parts (82) are chipped in areas having an angular cross section before the second saw cuts (86) are performed.

Description

Process and processing line for cutting tree trunks

The invention relates to a method for cutting tree trunks into wood products processed on all sides within a processing line, in which the tree trunks are broken down into a central part and outer parts by first saw cuts made parallel to a first longitudinal center plane, and then the outer parts are broken down into wood products by second saw cuts. wherein the second saw cuts are made parallel to a second longitudinal median plane which extends substantially at a right angle to the first longitudinal median plane. The invention further relates to a processing line for cutting tree trunks into wood products processed on all sides, with a first saw, with which the tree trunks are cut into a central part and outer parts by first saw cuts made parallel to a first longitudinal center plane, and arranged with a downstream of the first saw second saw, with which the outer parts are broken down into wood products by means of second saw cuts.

A method of the type mentioned at the outset is known from the document DE-Book by Fronius, Karl "Gatter, Nebenmaschinen, Schnitt- und Restholzverarbeitung", DRW-Verlag Stuttgart, 1991, pages 134-137.

In processing lines for cutting logs, the logs are usually broken down into the so-called main goods, i.e. a medium square timber, as well as the side goods, i.e. the areas adjacent to the main goods.

With regard to the side goods, depending on the diameter of the respective tree trunk and depending on the desired wood product, it is known to saw off either individual side boards or two side boards lying side by side.

From document DE 25 42 112 C2 it is known to further disassemble the resulting side products by means of a second saw cut in the same processing line. For this purpose, second saw cuts are made in a direction perpendicular to the longitudinal axis of the tree trunk by means of so-called dividing saws, so that the Side goods are cut to a certain length, for example 6 m in length.

The side boards produced in this way as side goods are thus sawn out of an area near the circumference of the tree trunk, the wide side of the boards lying parallel to a tangent to the tree trunk. This means that the annual rings of the tree trunk run essentially parallel to the broad side of the boards.

However, such conventionally manufactured boards have a higher tendency to warp because the expansion or shrinkage of wood parallel to the annual rings is greater than perpendicular to it.

It is also known in the prior art to break down tree trunks in the so-called "rift cut". Here, the tree trunks, viewed in the radial section, are broken down into circular sector-shaped parts and boards are then obtained from them, in which the annual rings are essentially parallel to the narrow side of the Boards run. Such "rift boards" are of higher quality because they have less tendency to warp. They are therefore used in highly stressed applications (weather influences), for example in window frames and the like.

From the document DE-book by Fronius, Karl “Gatter, auxiliary machines, sawing and residual wood processing”, DRW Verlag Stuttgart, 1991, pages 134-137, it is known to produce so-called wooden slats in different so-called “noble cuts” , which are referred to as "double model cut" and "Wagner cut". Doing so are from the middle sawn out one or more heart boards of a log, ie boards which extend in the width direction essentially along a cross-sectional line running through the axis of the log. The remaining two outer parts, which are circular in cross-section, are cut into lamellae in a direction perpendicular to the cross-sectional line, details of which are not given. When the outer parts are cut open, however, lamellae are formed which tend to warp on their narrow side which previously bordered the heart board and which moreover have to be trimmed. The slats must therefore still be reworked on both narrow long sides, which leads to a reduced yield.

In contrast, the invention is based on the object of developing a method and a processing line of the type mentioned at the outset such that these disadvantages are avoided. In particular, it should be possible to produce high-quality boards in the outer area with high yield within the same processing line. Furthermore, the invention should make it possible to be able to disassemble thick tree trunks into a large number of wood products with simple, complex effort and with a high yield.

In a method of the type mentioned at the outset, this object is achieved according to the invention in that the outer parts are machined in areas which are corner-shaped in cross-section before the second saw cuts are made.

In the case of a processing line of the type mentioned at the outset, the object is achieved according to the invention in that a corner milling cutter for cutting out regions of the cross section which are corner-shaped Outside parts are provided, and that an aligner is also provided to feed the outer parts of the second saw in such a way that the second saw cuts are made parallel to a second longitudinal center plane, which extends essentially at a right angle to the first longitudinal center plane.

The object underlying the invention is completely achieved in this way.

In contrast to conventional profiling systems, according to the present invention the outer parts are not cut in the original state by means of saw cuts. The invention provides that the cut outer parts are first profiled and then cut so that, in contrast to conventional procedures, the boards or lamellae produced from the outer parts are immediately produced with parallel and dimensionally accurate narrow sides, since they are only divided after profiling after removing the existing edge of the forest.

The separate processing of the outer parts is advantageously used to individually measure the outer parts again, so that the saw cuts made when the outer parts are dismantled can be laid in such a way that an optimal yield is obtained.

All of this can be done in one and the same processing line, in other words in contrast to conventional systems for producing rift cuts, where different processing lines are required in order to first cut the tree trunk into circular sector disassemble ge parts and then process them individually.

In a preferred development of the method according to the invention, the outer parts themselves are also broken down into middle parts and outer parts

This measure has the advantage that, particularly in the case of very thick tree trunks, the outer parts can be optimally disassembled, the same processing tools being used that were previously used for the disassembling of the tree trunk.

In a further preferred embodiment of the invention, the outer parts are laterally flattened before the second saw cuts are made.

This measure, which is known per se, has the advantage that a guide surface is created for the outer area, which enables optimal conveying in a defined position of the outer parts through the processing line.

It is further preferred if the outer parts are measured from the central part after sawing off.

This measure has the advantage already indicated above that an individual measurement of the outer parts leads to an optimal yield in the area of the outer parts. In contrast to conventional methods, in which the tree trunk was only measured once, whereby compromises have to be made, it can be done individually, depending on Shape of the outer parts, an optimal result in terms of yield can be achieved.

A particularly good effect is achieved in a further exemplary embodiment of the method according to the invention, in which the middle part is broken down into wood products in the same processing line.

This measure has the advantage that the entire tree trunk, even after it has been dismantled, is dismantled into the middle part and the outer parts within a single installation. The machining tools can therefore be used several times, the middle part and / or the outer parts being able to be guided several times through the same section of the machining line, and the same tools then always carry out different machining operations on the elements mentioned. This means that even complex machining tasks can be carried out with just a few machining tools, in contrast to conventional profiling systems, where very large and very complex machining stations are required to completely machine an entire tree trunk in one machining operation.

According to the invention, it is further preferred if the middle section is broken down into wood products by means of third saw cuts, the third saw cuts in the middle section being made parallel to the first saw cuts.

This measure also has the advantage that, with appropriate orientation of the tree trunk, boards can be produced from the central part, in which the course of the annual rings is optimally placed, so that rift boards are also formed here. In this context, it is further preferred if the middle section is broken down into wood products by means of fourth saw cuts, the fourth saw cuts in the middle section being made at a right angle to the first saw cuts, preferably in such a way that a heartwood remains in the region of a longitudinal axis of the tree trunks.

This measure has the advantage, in particular in the case of old tree trunks, that the heartwood, which is less valuable, and in some cases also worthless, can be removed from the tree trunk in a defined manner and disposed of separately.

In an alternative exemplary embodiment, with a corresponding modification of the sequence of the method steps, the procedure can also be such that the middle section is broken down into wood products by means of third saw cuts, the third saw cuts in the middle section being made at a right angle to the first saw cuts, preferably in such a way that in the A heartwood remains in the area of a longitudinal axis of the tree trunks.

Accordingly, in the aforementioned alternative exemplary embodiment, the middle section can be broken down into wood products by means of fourth saw cuts, the fourth saw cuts in the middle section being carried out parallel to the first saw cuts.

In exemplary embodiments of the method according to the invention, the middle part is measured after the outer parts have been sawn off. This measure also has the advantage already described above in connection with the outer parts, that an individual measurement of the middle part allows an individual optimization of the yield with regard to the middle part, regardless of the disassembly of the outer parts.

In further exemplary embodiments of the method according to the invention, the tree trunks are laterally flattened before the first saw cut is made.

This measure, which is known per se, also has the advantage that a defined guide surface is created for the further promotion of the tree trunk.

It can be provided in a further advantageous manner to provide the tree trunks with flats both parallel to the first longitudinal central plane and parallel to the second longitudinal central plane.

Although different machining methods, in particular sawing methods, can be used within the scope of the present invention, it is preferably provided that the first saw cuts are made by means of a band saw, the second and / or the third and / or fourth saw cuts, on the other hand, by means of a double-shaft circular saw.

Further advantages result from the description of the attached drawing.

It goes without saying that the features mentioned above and those yet to be explained below are not only apparent in each case specified combination, but can also be used in other combinations or alone, without departing from the scope of the present invention.

Embodiments of the invention are shown in the drawing and are explained in more detail in the following description. Show it:

1 shows a schematic radial section through a tree trunk which is to be processed in the manner according to the invention;

FIG. 2 shows an illustration like FIG. 1, but to explain a first work step;

3 shows a representation like FIG. 1, but to explain a second working step;

FIG. 4 shows an illustration like FIG. 1, but to explain a third work step;

5 shows a representation like FIG. 1, but to explain a fourth work step;

FIGS. 6A and 6B show a radial section through a main item (FIG. 6A) and outer parts (FIG. 6B) which were produced in the fourth working step according to FIG. 5, for the purpose of explaining further details;

FIG. 7 shows the outer parts according to FIG. 6B on an enlarged scale to explain a subsequent work step; FIG.

FIG. 8 shows a representation like FIG. 7, to explain a further working step;

FIG. 9 shows a representation like FIG. 8, but to explain a still further working step; 10 shows a further radial section through a tree trunk to illustrate a further possible division into wood products according to the method according to the invention;

11 is an extremely schematic block diagram of an example of a processing line according to the invention;

12 to 17 in six individual representations a variant of the method according to FIGS. 1 to 6.

In FIG. 1, 10/1 denotes a tree trunk in a radial sectional view in a first exemplary embodiment. Although the invention is not limited to this, it is preferably used in connection with so-called heavy wood, i.e. Tree trunks at least 30 to 60 cm in diameter and above. Heavy wood falls at the bottom of very tall and very old trees. It is generally free of knots because such trees have no branches in the lower area. The wood produced in this area is therefore of special quality.

One of the aims of the invention is to achieve so-called “riftware” by suitably positioning the saw cuts when the tree trunk is broken down into wood products. This is understood to mean boards in which the annual rings of the wood run essentially perpendicular to the broad surface of the boards is used as a high-quality product for corresponding applications, for example for window frames and the like, in which the wood remains undistorted even under special loads, especially weather conditions, since wood only in a direction transverse to the annual rings by about 6%, but in the direction of the annual rings shrinks by 10%, riftware warps much less than conventional goods, as can be produced with conventional profiling processes In these conventionally manufactured boards, the annual rings run essentially parallel to the wide surface of the boards.

Fig. 1 shows the already debarked tree trunk 10/1, which rests on a support indicated at 12. The longitudinal axis of the tree trunk 10/1 is designated 13. A first longitudinal central plane 14 and a second longitudinal central plane 15 are thereby defined, the longitudinal central planes 14 and 15 intersecting at a right angle.

In Fig. 1, the annual rings of the tree trunk 10/1 are indicated at 16, the course of which is of particular importance for the present invention.

In a first step, which is shown in Fig. 2, flats 18a and 18b are attached to the right and left of the tree trunk 10/2 in a manner known per se, e.g. Areas 19a and 19b there are machined by means of a machining tool of known design. The flats 18a, 18b run parallel to the first longitudinal median plane 14.

3 shows the tree trunk 10/3 after the next work step, in which the tree trunk 10/2 from FIG. 2 has been rotated by 90 ° in the direction of an arrow 20, so that the tree trunk 10/3 is now flattened 18b on the Edition 12 rests. The longitudinal center planes 14, 15 have also rotated their position by 90 °. FIG. 4 shows the tree trunk 10/4 with a next work step, in which it has again been provided with flats 22a, 22b on the side, by regions 23a, 23b located there being machined.

Already at this point it should be pointed out that the flats 18 according to FIG. 2 and 22 according to FIG. 4 can be attached in the same processing station by rotating the tree trunk 10/2 back to the entrance after the working step according to FIG. 2 conveyed back to the processing station and was thereby rotated by 90 ° according to FIG. 3.

Up to this point, the process is conventional.

Fig. 5 now shows a further processing step in which the tree trunk 10/5 by means of saw cuts 24, 24b into a first middle part 26 and first outer parts 28a, 28b, i.e. two side elements that was disassembled. The saw cuts 24a, 24b lie parallel to the second longitudinal center plane 15. The outer parts 28a, 28b separated on both sides of the first middle part 26 have a crescent-shaped or circular-section-like shape in radial section.

The three elements 26, 28a and 28b produced in the saw cut according to FIG. 5 are now processed further separately, which does not exclude the fact that they are partly processed in succession in the same processing stations or also in different processing stations.

6A shows the first middle part 26 in more detail. 6A shows a region of the core around the longitudinal axis 13. wood 30 indicated. Heartwood is the wood in the middle of the tree trunk, which can be of lower quality, especially with very thick and very old tree trunks. One of the objects of the present invention is to separate the heartwood 30 separately from the tree trunk so that it can be processed or disposed of separately.

For this purpose, the first middle part 26 is cut up for this purpose by means of saw cuts 32a, 32b in such a way that the heartwood 30 is sawn out. It goes without saying that the dimensions and proportions given in FIG. 6A are only to be understood as examples and do not limit the invention in any way.

The remaining wood of the first middle part 26 can now be divided into a total of eight boards 36a to 36h by means of saw cuts 34a-34d.

FIG. 6B again shows a middle part 28 (1) which rests on the support 12 with an underside 42 and is to be further processed, as will be explained below with the enlarged representations of FIGS. 7 to 9.

5, two outer parts 28a, 28b are produced and these can possibly reach the support 12 by resting with their flat 22 instead of the underside 42, it may be necessary to recognize this by measuring, and the Then turn the outer parts 28 accordingly by 180 °, so that the reference position required for the subsequent machining according to FIG. 6B is reached. FIG. 7 shows an outer part 28 (2) in a processing step, in which, as in the previous processing of the tree trunk 10/2 according to FIG. 2, lateral flats 44a, 44b are attached by cutting off areas 45a, 45b located there.

8, a profiling process then follows, in which so-called corners 46a, 46b are produced by correspondingly machining corner-shaped regions 47a, 47b, as well as further corners 48a, 48b with regions 49a, 49b. So-called corner milling cutters are used for this purpose, as are known per se in the prior art. These corner milling cutters can each be designed for milling two corners (or as a corresponding multiple milling cutter for milling out several corners). The profiling technology used for this is known per se.

After the outer part 28 (3) has been profiled according to FIG. 8, it is dismantled as the outer part 28 (4) according to FIG. 9. For this purpose, saw cuts 50a, 50b and 52a, 52b are made, and second outer parts 56 in the form of boards 58a, 58b and 60a, 60b are separated from a second middle part 54 that is now being created.

The second central part 54 can then be broken down into boards 64 by means of saw cuts 62.

It can be clearly seen from the illustration in FIG. 9 that the boards 58a, 58b, 60a, 60b and 64 produced in this way are penetrated by the annual rings 16 in a direction which is essentially perpendicular to the respective broad side of the boards mentioned. These are high quality rift boards. This course of the annual rings 16 was thereby has the effect that the saw cuts 50, 52 and 62 were placed parallel to the first longitudinal center plane 14, that is to say perpendicular to the saw cuts 24 according to FIG. 5, with which the tree trunk 10/5 was originally broken down into a first main article 26 and first outer parts 28.

As has already been mentioned, the representations explained so far are only to be understood as examples, because of course the tree trunks can also be broken down in a different way and into a different number of wood products.

10 shows, as a second exemplary embodiment, a tree trunk 70 with a longitudinal axis 71, in a first longitudinal central plane 72 and a second longitudinal central plane 73, which extends at a right angle thereto.

The tree trunk 70 is first provided with flats 74 and 76 and then cut into a central part 80 and outer parts 82 by saw cuts 78 parallel to the first longitudinal median plane 72. Flats 84 are attached to the outer parts 82 and after profiling has been carried out, the outer parts 82 are then broken down into boards 88 by means of saw cuts 86. The central part 80 is broken down into boards 92 by means of further saw cuts 90. Finally, a heartwood 96 can be removed using saw cuts 94.

It can be seen from FIG. 10 that in this way a total of 28 boards are produced in the area of the middle part 80 and again 14 boards in the area of each outer part 82, that is to say the tree trunk 70 is broken down into a total of 56 boards. 11 shows an exemplary embodiment of a processing line 100 on which the previously described method can be carried out in a first variant.

It should be noted that the processing steps previously explained with reference to FIGS. 1 to 9 can of course not only be carried out in the order specified, but possibly also in a different order, depending on how this is optimal in terms of process technology. For this purpose, reference may be made to the second exemplary embodiment according to FIG. 10 and a third exemplary embodiment shown in FIGS. 12 to 17.

It also goes without saying that a measurement of the tree trunk or the middle part or the outer parts can take place between the individual processing steps, which is particularly advantageous because in this way each individually produced wood part or wood product can also be individually dismantled by individual measurement , In this way, a significantly improved degree of utilization can be achieved. The measurement stations required for this are not shown separately in FIG. 11 again.

In FIG. 11, a raw wood feeder can be seen at 102, the solid arrows shown in FIG. 1 generally representing longitudinal conveyors on which the tree trunks or parts of the tree trunks are conveyed in the direction of their longitudinal axis.

From the raw wood feeder 102, the initially completely unprocessed tree trunk reaches a debarker 104, in which the tree trunk debarks and a possibly existing earth end, ie a trumpet-shaped widening at the lower end of the tree trunk is removed.

The tree trunk pre-processed in this way, which corresponds to the tree trunk 10/1 according to FIG. 1, is now transferred via a converter 106 to a cross conveyor 108, on which it is conveyed transversely to its longitudinal direction. The tree trunk now arrives at a double transfer device 110, which transfers it to a further longitudinal conveyor, and this leads the tree trunk to a flattener 112, on which, according to FIG. 2, it is flattened. A subsequent band saw unit 114 is not yet active at this moment. The bilaterally flattened tree trunk is further conveyed to a double converter or aligner 116 and from there to a cross conveyor 118 which initiates a round trip via a converter 120 in which the tree trunk is rotated through 90 ° on a turning station 121 according to FIG. 3 , It then passes through a converter 122 and a cross conveyor 124 and arrives again at the double converter 110 in order to go through the flattener 112 again, which now attaches the flats to the other two sides according to FIG. 4. In the band saw unit 114, which is now active, the tree trunk which is flattened on four sides is broken down into a central part and two outer parts according to FIG. 5. The double converter or aligner 116 now causes the middle part of the sawn-up tree trunk to reach a cross conveyor 126 and from there via a converter 128 to a longitudinal conveyor which leads to a double-shaft circular saw 130. The double-shaft circular saw 130 takes care of the disassembly of the middle part according to FIG. 6A into boards. If a heartwood is to be sawed out, a corresponding further runout is advisable at this point. The boards produced in this way arrive at an output-side cross conveyor 134 via a further converter 132.

The outer parts produced in the band saw unit 114 are brought into the correct position according to FIG. 6B and separated in the double converter or aligner 116, so that the two outer parts successively arrive at a converter 136, which converts them on a cross conveyor 138. From there, a converter 140 guides them over a longitudinal conveyor line with a flattener 142, which attaches flats according to FIG. 7. The flattened outer parts then arrive at a corner milling cutter 144, which carries out profiling according to FIG. 8. This is followed by a double-shaft circular saw 146, with which the profiled outer parts according to FIG. 9 are broken down into boards. These boards are also transferred from a converter 148 to the cross conveyor 134 on the output side and fed there to a finished wood output 150.

As has already been mentioned, the representation according to FIG. 11 is only to be understood as an example and can of course be supplemented by further round trips or also be moved in some other way.

Furthermore, it goes without saying that all conceivable variants are possible with regard to the number of corners, the number of boards, the position of the boards, the length and width of the boards and the like, as long as the basic concept of the present invention is not left.

12 to 17 schematically illustrate a third embodiment of the method according to the invention. A tree trunk 160/1 in turn lies on a support 162. A longitudinal axis 163 of the tree trunk 160 is at the same time the cutting line of a first longitudinal center plane 164 and a second longitudinal center plane 165 which intersect at a right angle.

13, the tree trunk 160/2 is now provided with side flats 166. This can be done in the flat 112 according to FIG. 11.

In contrast to the first exemplary embodiment of the method according to the invention illustrated in FIGS. 1 to 6, however, in the third exemplary embodiment according to FIGS. 12 to 17 the tree trunk 160/3 according to FIG. 14 is immediately cut up. For this purpose, two saw cuts 168 are made through the tree trunk 160/3 parallel to the first longitudinal center plane 164. This is preferably done by means of the band saw unit 114 in FIG. 11. In this way, the tree trunk 160/3 is divided into a central part 170/1 and two outer parts 172.

The further processing of the outer parts 172 now takes place in the manner already described, i.e. in the assemblies 116 to 146 according to FIG. 11.

However, the central part 170/1 is now put on the concentric run with the turning station 121, where the central part 170/1 is rotated by 90 ° (arrow 174) and reaches the rotated position 170/2 shown in FIG. 15.

In this orientation, the central part 170/2 returns to the flattener 112 after leaving the concentric run. 16, the central part 170/3 is flattened with lateral flats 176 see and then immediately runs into the band saw unit 114. There it is disassembled as a central part 170/4 according to FIG. 17 by means of saw cuts 178. It should be noted at this point that in this third exemplary embodiment of the method according to the invention, the saw cuts 178 in the central part 170/4 are made at a right angle to the saw cuts 168 according to FIG. 14 and not parallel, as in the first exemplary embodiment according to FIGS. 5 and 6th

By dividing the middle part 170/4 according to FIG. 17, two things can be achieved. On the one hand, a heartwood 180 can be sawn out in the area of the longitudinal axis 163 and then treated further separately. On the other hand, the middle part 170/4 can be divided by the saw cuts 178 into a plurality of squared timbers 182, which now reach the double-shaft circular saw 130 via the assemblies 116, 126 and 128 in FIG. 11 and are divided there into rift boards 186 by means of further saw cuts 184. A further concentricity in the area of the double-shaft circular saw 130 is therefore not necessary in this case — in contrast to the exemplary embodiment in FIGS. 1 to 6.

Claims

claims

1. Process for cutting tree trunks (10; 70; 160) into all-processed wood products (26, 30, 36, 54, 58, 60, 64; 88, 92, 96; 170, 180, 182, 186) within a processing line (100), in which the tree trunks (10; 70; 160) through first saw cuts (24; 78; 168) made parallel to a first longitudinal median plane (15; 72; 164) into middle parts (26; 80; 170) and outer parts (28; 82; 172) are disassembled and then the outer parts (28; 82; 172) are disassembled into wood products (54, 58, 60; 88) by second saw cuts (50, 52, 62; 86), the second saw cuts (50, 52, 62; 86) are guided parallel to a second longitudinal median plane (14; 73; 165), which extends essentially at a right angle to the first longitudinal median plane (15; 72; 164), characterized in that the outer parts (28; 82) must be machined in areas (47, 49) that are corner-shaped in cross-section before making the second saw cuts (50, 52; 86).

2. The method according to claim 1, characterized in that at least the outer parts (28; 82) are measured before the removal.

3. The method according to claim 1 or 2, characterized in that the outer parts (28; 82; 172) in turn is also broken down into middle parts (54) and outer parts (56).

4. The method according to one or more of claims 1 to 3, characterized in that the outer parts (28; 82) before the guiding of the second saw cuts (50, 52; 86) are laterally provided with flats (44; 84).

5. The method according to one or more of claims 1 to 4, characterized in that the outer parts (28; 82) are measured after sawing off the central part (26; 80).

6. The method according to one or more of claims 1 to 5, characterized in that in the same processing line (100) the central part (26; 80; 170) is broken down into wood products (36; 90; 180, 182, 186).

7. The method according to claim 6, characterized in that the central part (26; 80) by means of third saw cuts (34; 90) is broken down into wood products (36; 92), the third saw cuts (34; 90) in the central part (26; 80) are made parallel to the first saw cuts (24; 78).

8. The method according to claim 6 or 7, characterized in that the middle part (26; 80) by means of fourth saw cuts (32; 94) is broken down into wood products, the fourth saw cuts (32; 94) in the middle part (26; 80) below are made at a right angle to the first saw cuts (24; 78), preferably in such a way that a heartwood (30; 96) remains in the region of a longitudinal axis (13; 71) of the tree trunks (10; 70).

9. The method according to claim 6, characterized in that the central part (170) by means of third saw cuts (178) is broken down into wood products (180, 182), the third Saw cuts (178) are made in the middle part (170) at a right angle to the first saw cuts (168), preferably in such a way that a heartwood (180) remains in the area of a longitudinal axis (163) of the tree trunks (160).

10. The method according to claim 6 or 9, characterized in that the central part (170) by means of fourth saw cuts (184) is broken down into wood products (186), the fourth saw cuts (184) in the central part (170) parallel to the first saw cuts ( 168).

11. The method according to one or more of claims 6 to 10, characterized in that the central part (26; 80; 170) is measured after sawing off the outer parts (28; 82; 172).

12. The method according to one or more of claims 1 to 11, characterized in that the tree trunks (10; 70; 160) before making the first saw cuts (24; 78; 168) laterally with flats (18, 22; 74, 76 ; 166) can be provided.

13. The method according to claim 12, characterized in that the tree trunks (10; 70) both parallel to the first long median plane (15; 72) and parallel to the second long median plane (14; 73) with flats (18, 22; 74, 76) be provided.

14. The method according to one or more of claims 1 to 13, characterized in that the first saw cuts (24; 78; 168) are performed by means of a band saw (114).

15. The method according to one or more of claims 1 to 14, characterized in that the second saw cuts (50, 52; 86; 178) are performed by means of a double-shaft circular saw (146).

16. The method according to one or more of claims 1 to 15, characterized in that the third saw cuts (34; 90; 178) and / or the fourth saw cuts (32; 94; 184) are performed by means of a double-shaft circular saw (130).

17. Processing line for cutting tree trunks (10; 70; 160) into wood products processed on all sides, with a first saw (114) with which the tree trunks (10; 70; 160) pass through a first, parallel to a first longitudinal median plane (15; 72 ; 164) guided saw cuts (24; 78; 168) are divided into a central part (26; 80) and outer parts (28; 82; 172), and with a second saw (146) arranged downstream of the first saw (114) which the outer parts (28; 82; 172) are broken down by second saw cuts (50, 52, 62; 86) into wood products (54, 58, 60; 88), characterized in that a corner milling cutter (144) for cutting out cross-section corner-shaped areas (47, 49) of the outer parts (28; 82) is provided, and that an aligner (116) is also provided in order to feed the outer parts (28; 82) to the second saw (146) in such a way that the second saw cuts ( 50, 52, 62; 86) are guided parallel to a second longitudinal median plane (14; 73; 165), which is essentially Lichen at a right angle to the first longitudinal median plane (15; 72; 164) extends.

18. Processing line according to claim 17, characterized in that a third saw (130) for disassembling the central part (26; 80; 170) into wood products (36; 90; 180, 182, 186) is provided.

19. Processing line according to claim 17 or 18, characterized in that the first saw (114) is a band saw.

20. Processing line according to one or more of claims 17 to 19, characterized in that the second saw (146) and / or the third saw (130) is a double-shaft circular saw.