EP1846199A1

EP1846199A1 - Straightening bench

Info

Publication number: EP1846199A1
Application number: EP06704168A
Authority: EP
Inventors: Ulf Bodare
Original assignee: Esterer WD GmbH and Co
Current assignee: Esterer WD GmbH and Co
Priority date: 2005-02-10
Filing date: 2006-01-14
Publication date: 2007-10-24
Also published as: DE102005007934B3; WO2006084540A1

Abstract

The invention relates to a straightening bench (17) for wood products, especially wany boards (24). Said straightening bench (17) comprises a longitudinal conveyor having a longitudinal axis (16) defining a transport direction (15). Straightening arms (40r, 401) for laterally gripping and aligning the wood products are arranged on both sides of the longitudinal conveyor in a pre-determined position in relation to the longitudinal axis (16). Each straightening arm (40r, 401) can be pivoted about an axis (42r, 421) and is applied, by an abutment surface (66r, 661) thereof, to a point (68r, 681) on an edge (56r, 561) of the wood product transported along the longitudinal conveyor (14). A distance (d) between the point (68r, 681) and the axis (42), measured in the direction of the longitudinal axis (16), is kept constant when the wood product passes in front of the straightening arm (40r, 401).

Description

straightening table

The invention relates to a straightening table for wood products, in particular wood edged boards, with a longitudinal conveyor whose longitudinal axis defines a conveying direction, arranged with both sides of the longitudinal conveyor straightening arms for laterally detecting and aligning the wood products in a predetermined position relative to the longitudinal axis, each directional arm pivotable about an axis is and applies with a contact surface at one point to an edge of the respectively promoted on the longitudinal conveyor wood product.

A straightening table of the aforementioned type is known from DE 33 17 303 Cl. Straightening tables are needed in wood processing in order to align wood products, in particular wood-edged boards, before entering a sowing saw aggregate in such a way that the proportion of lumber is optimized.

In known straightening tables, the board is supplied by a cross conveyor and placed in the transverse direction on the longitudinal conveyor. By means of straightening the board is then aligned on the longitudinal conveyor and then conveyed away, for example, in the direction of the Besäumsäge aggregate •

Known straightening tables have two disadvantages:

The first drawback is that the board transferred from the cross conveyor to the longitudinal conveyor is aligned with the aligning arms, but the association between the board aligned with the longitudinal conveyor and the straightening arms is immediately lost again when the board accelerates in the longitudinal direction of conveyance becomes. The board is generally slanted on the longitudinal conveyor, so that the straightening arms slide with their contact surfaces along the also sloping edges of the board along when the board passes by the straightening arms. Then, however, the distance between the points of contact of the straightening arms at the edges of the axes of the straightening arms changes, and a control of the straightening arms depending on the course of the width of the board over its length is no longer possible.

The second disadvantage is that the board in the transverse direction, that is in the longitudinal conveying direction, is placed on the longitudinal conveyor at zero speed. The board needs Therefore, first be accelerated from standstill to the speed of the longitudinal conveyor. If this acceleration is to be effected solely by the carriers of the longitudinal conveyor, in addition to interacting with an acting from above pressure element or hold- _r then the board is damaged at least on its underside by the slip between the carriers of the conveyor chain and the board.

The invention is therefore the object of developing a straightening table of the type mentioned in such a way that the above-mentioned disadvantages are avoided. In particular, a straightening table is to be provided which permits alignment under defined conditions, as well as effective acceleration of the board delivered by the cross conveyor to the speed of the longitudinal conveyor.

In a straightening table of the type mentioned above, this object is achieved in that a measured in the direction of the longitudinal axis distance between the point and the axis is kept constant when the wood product passes the directional arm.

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

The formation of the contact surfaces in the manner described causes, namely, that even when passing an obliquely to the longitudinal conveying direction extending edge of the board defined conditions are maintained. It is therefore far more precise than previously possible to leave the straightening arms over a longer distance at the lateral edges of the boards. In a preferred embodiment of the invention, the contact surface is formed as involute.

In an alternative embodiment of the invention, the axis can be moved in the conveying direction and transversely thereto and the pivot angle for each directional arm can be adjusted individually.

Then, preferably, the contact surface is circular.

In further preferred embodiments, the position of the point which is constant in the direction of the longitudinal axis during the transfer of a transverse conveyor arranged upstream of the longitudinal conveyor is aligned with the longitudinal conveyor with a measuring plane of a measuring device on the transverse conveyor, the measuring plane serving to detect the width of the wood product in the measuring plane.

This measure has the advantage that the width measured in the region of the transverse conveyor immediately enters into the positioning of the straightening arms and can also be used for further regulation.

It is further preferred if in each case a pair of straightening arms arranged on different sides of the longitudinal conveyor is arranged on a common frame, and the frame can be moved in a direction transverse to the longitudinal axis.

This measure has the advantage that the straightening arms can be moved to the edges of the board in the optimal starting position before the first application. In this case, it is particularly advantageous if the frame is movable such that the points are substantially symmetrical to a center line of the wood product when first applying the straightening arms to the edges of the wood product.

This measure has the advantage that the straightening arms can be adjusted in a particularly simple manner, preferably uniformly and in opposite directions.

In this context, it is further preferred if the frame is readjusted when passing the wood product on the straightening arms to that path by which the center line has migrated out of the position that it had taken when first applying.

This measure has the advantage that the straightening arms can rest for a particularly long time on the edges of the board, without thereby changing the orientation of the board.

Alternatively, in another embodiment of the invention, the straightening arms are mounted fixed in space and individually rotatable by means of servo drives.

In further preferred embodiments of the invention only two pairs of straightening arms can be applied to a wood product.

This measure has the advantage that it can be worked with a minimum of straightening arms, for example, if they attack only at the front and at the rear end of the board. The small number of straightening reduces the regulatory burden.

A special feature of the invention, which can also be used in another context and alone, is characterized in that a conveying element is arranged in the region of the contact surface of each directional arm.

This measure has the advantage that the board in the sense already described above can be accelerated quickly from a standstill to the speed of the longitudinal conveyor, without damaging the board by slipping on drivers must be feared. The conveyor elements are essentially resting on the edges of the board at a standstill and are accelerated out of a standstill so that there is no slippage that could cause damage.

In this case, the conveying element is preferably designed as a conveyor chain running around a curved contact surface.

As already indicated, the conveying element is preferably actuated for a short time in order to accelerate the timber product placed on the longitudinal conveyor from standstill to a conveying speed of the longitudinal conveyor.

Finally, the straightening arms are preferably applied with a contact force to the wood products, which essentially corresponds to the weight of the wood products. This measure has the advantage that a finite value for the contact force that has been tested in practice is available both for the alignment and for a possible acceleration.

Further advantages will become apparent from the description and the accompanying drawings.

It goes without saying that the features explained above and those yet to be explained below can be used not only in the respectively indicated combination but also in other combinations or in isolation without departing from the scope of the present invention.

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

Fig. 1 is a schematic side view of a conveyor device with a cross conveyor and a longitudinal conveyor, on which a straightening table can be used;

Fig. 2 in comparison with Figure 1 reduced scale a plan view of the conveyor;

Fig. 3 in greatly enlarged scale a detail of FIG. 2 for explaining details of the straightening table; Fig. 4 is a side view of a stop hook, as it is used in a transverse conveyor of the conveyor, in a first operating position.

Fig. FIG. 5 shows a view like FIG. 4, but for a second operating position of the stop hook; FIG.

FIG. 6 is a view similar to FIG. 4 for explaining a singulation process in a first phase; FIG.

Fig. 7 is a view like FIG. 6, but for a second phase; and

Fig. 8 is a representation like Fig. 6, but for a third phase.

In Fig. 1 and 2, 10 denotes a conveyor for wood products, especially for still wood edged boards. The boards are fed to the conveyor 10 as a disordered pile. The conveyor 10 now has the task of organizing this disordered pile by first separating the boards and then fed in a predetermined order and orientation of a processing station. This processing station is usually a besäumsäge aggregate in which the boards are freed from the forest edge. This happens under the best possible use of the wood.

The conveyor initially has a transverse conveyor 12, whose conveying direction is indicated by 13. From the transverse conveyor 12, the wood products are transferred to a longitudinal conveyor 14, whose conveying direction is designated 15. The cross-conveyor direction 13 and the longitudinal conveying direction 15 are perpendicular to each other. The longitudinal conveyor 14 is usually a chain conveyor. Its longitudinal axis, which extends in the conveying direction 15, is designated by 16.

The longitudinal conveyor 14 is assigned a straightening table 17. The straightening table 17 has the task of aligning the wood products transferred in the transverse direction from the cross conveyor 12 to the longitudinal conveyor 14 on the longitudinal conveyor 14 in such a way that, for example, the forest edge of wood-edged boards with the greatest possible wood yield is removed in a besäumsäge aggregate 18 arranged downstream of the straightening table 17 can be. "Alignment" means that the wood products are positioned on the longitudinal conveyor 14 in a pre-calculated position and angular position to the longitudinal axis on the longitudinal conveyor 14.

As shown in FIG. 2, the transverse conveyor 12 is of multi-stage construction, in that groups of first transverse conveyor elements 20 and second transverse conveyor elements 22 are arranged one behind the other in the transverse conveying direction 13, usually further transverse conveyor elements in front of them. These cross conveyor elements 20, 22 and others have the purpose to arrange the disorderly delivered wood products, d. H . first to singulate, then align with respect to their leading edge and finally to promote in a predetermined cycle, which corresponds to the clock of the downstream units. For this purpose, the transverse conveyor elements are usually arranged in a side view along an arcuate path, in which the wood products are initially conveyed uphill and then downhill again in some installations. This is known to the person skilled in the art. As a preferred example, FIG. 2 shows a board 24 which is currently located on the second transverse conveyor elements 22. The board 24 has an undefined length. Although it is already isolated here, but it is only approximately and undefined transverse to the transverse conveying direction 13. It is also a matter of chance, on which the cross conveyor elements 22 it rests. For example, a subsequent board 26 has a different length and rests on other cross conveyor elements 22 and also in a different orientation, i. H. at a different angle to the transverse conveying direction 13.

However, the boards 24 and 26 are expediently arranged so that they are both placed with the same .End, in the illustrated case with the respective thinner end ahead in the longitudinal conveying direction 15.

When the boards 24, 26, etc. are transferred to the longitudinal conveyor 14, they are aligned with its leading edge substantially and they have in the transverse conveying direction 13 a predetermined distance from each other, so that the boards 24, 26, etc. the longitudinal conveyor 14 in a corresponding clock are passed.

In Fig. 1 it can be seen that every second transverse conveying element 22 has a first conveying section 30 and a second conveying section 32 in the conveying direction 13. On the first conveyor section 30 takes place the alignment of the previously separated boards 24 at its front edge and the setting of the delivery cycle. For this purpose, several, for example three, stop hooks 34a, 34b and 34c are provided in succession. Their function will be described below with reference to FIG. 4 to 8 yet explained in more detail. The second conveyor section 32 is formed slightly sloping in the conveying direction 13 and serves for the cyclical transfer of the boards 24 to the longitudinal conveyor 14 in the region of the straightening table 17th

Fig. 1 also shows that the longitudinal conveyor 12 runs in a housing 36. Further details of the longitudinal conveyor 12 are not shown, since they are known in the art.

The straightening table 17 is provided with a plurality of, for example, five pairs A, B, C D and E of straightening arms, which are respectively arranged on both sides of the longitudinal conveyor 12. In Fig. 2 and 3, a right directional arm 40r and a left directional arm 401 are designated with respect to the longitudinal conveyor 12. Each directional arm 4Or, 401 is pivotable about an axis 42r, 421, as indicated by an arrow 43r, 431. The swivel angle is designated in FIG. 3 by φr or φl.

By a coupling rod can be ensured that the straightening arms 4Or and 401 are pivoted uniformly and in opposite directions. However, the coupling rod is to be understood as an example only, because of course other mechanical or servo-motor coupling arrangements can be used. Since arrangements with coupling rods for large opening angles constructively have a center error, embodiments of the invention can be provided to compensate for this mathematically calculable error by a suitable individual servo control of the opening angle of the Riσhtarme.

Although the straightening table 17 has a plurality of pairs A to E of straightening arms 401 and 4Or, in embodiments of the Invention used to align a particular board only two Richtarmpaare that attack as far forward and as far back on the board. The selection among the existing pairs of directional arms is made depending on which length and which position the board has on its transfer from the cross conveyor to the longitudinal conveyor. In the example of Fig. 2, the Richtarmpaare A and C would be used for the alignment of the board 24, the Richtarmpaare B and C and for the subsequent board 26.

The straightening arms 4Or and 401 are applied to the boards with a predetermined pressing force. For example, if the thickness of the board is 23 mm and the length is about 4 m, for wide boards with a width of 40 to 70 cm, a contact pressure in the range between 2,000 and 4,000 N is set. For narrow boards with a width of 10 to 40 cm, the contact pressure in the range of 300 to 400 N will be chosen. As a rule of thumb may apply that the contact force is set as large as the weight of the board.

Furthermore, in the region of the longitudinal conveyor 12 and thus also in the region of the straightening table 17 a plurality of hold-downs 44 distributed along the longitudinal axis 16 are provided, as shown in FIG. 1 and 2 shown.

In the region of the transverse conveyor 12 is located at each cross conveyor element 22, a measuring device 50, from the in Fig. 2 for the sake of clarity, only one is shown. The measuring device 50 defines a measuring plane 52, which runs parallel to the transverse conveying direction 13. The measuring device 50 is in the simplest case of a light barrier, but can also for Example be designed as a laser measuring device, as is known per se. The measuring device 50 detects the width b of the board 24 in the respective measuring plane 52. From the measurement results, an optimal position of the board 24 on the longitudinal conveyor 14 is further determined, ie in which angular position of the center line of the board 24 and in which lateral position of the board 24th on the longitudinal conveyor 14 an optimal yield of wood in the downstream Besäumsäge aggregate 18 can be achieved. These measurement results are used to control the straightening arms with which the board 24 is aligned accordingly on the longitudinal conveyor 14.

In Figure 3, the board 24 with its forest edges 54 can be seen in an enlarged view. The board 24 has a right edge 56r and a left edge 561. A center line 58 of the board 24 extends midway between the edges 56r and 561. The center line 58 is inclined to the longitudinal axis 16 by an angle α. The board 24, which, as already mentioned, rests with the thinner end on the longitudinal conveyor 16, has a half opening angle ß, which is enclosed by the edge 56 and the center line 56. Overall, this means that the left edge 561 is set to the longitudinal axis 16 by an angle γl, where γl = α + ß. Accordingly, for the right edge 56r, γr = α-β.

The two Riσhtarme 4Or and 401 sit in embodiments of the invention on a common support, for example, a frame 60 or the like. The frame 60 is fixed in space in the direction of the longitudinal axis 16. This means that the axes 42r and 421 define a first, fixed longitudinal position 62. However, the frame 60 is in a direction transverse to the longitudinal axis 16 movable, as indicated by an arrow 64. Instead of a frame but also another equivalent arrangement can be selected.

One can do without the frame completely, if one adjusts the straightening arms 4Or and 401 each individually servomotorically. The straightening arms 4Or and 401 then need not be movable transversely to the longitudinal axis 16.

The straightening arms 4Or and 401 have abutment surfaces 66r and 661, which abut respectively at an abutment point 68r and 681 at the edges 56r and 561, respectively. The straightening arms 4Or and 401 each have two wheels 7Or and 701 and 72r and 721, of which the wheels 7Or and 701 are rotatable about the axes 42r and 421, respectively, to allow the pivoting movement of the straightening arms 4Or and 401. About the wheels 7Or, 701 and 72r, 721 runs a conveyor chain 74, which is indicated in Fig. 3 on the directional arm 401. The conveyor chain 74 moves in the direction of the arrow 76.

The abutment surfaces 66r and 661 extend in an arcuate manner above and between the wheels 7Or and 72r and below the wheels 701 and 721, respectively. The abutment surfaces 66r and 661 have a shape chosen such that the abutment points 68r and 681 at each Swivel angle φr and φl lie on a straight line which extends transversely to the longitudinal axis 16 and thus forms a second longitudinal position 78. The special feature is that the axial distance d between the longitudinal positions 62 and 78 is constant, regardless of the angle φr or φl the directional arms 4Or or 401 are just pivoted. In FIG. 3, for example, it can be seen that φr is approximately 0 °, whereas φl is approximately 20 °. This is achieved by a shaping of the contact surfaces 66r and 661 in the manner of an involute.

In other embodiments of the invention is dispensed with the special shape of the contact surfaces. Namely, one can also ensure the constant axial distance denoted by d in FIG. 3 by forming the two straightening arms movable in the longitudinal direction and in the transverse direction and, for a given shape of the contact surface, moving computer-controlled along the two directions in such a way that the constant distance is established , For this purpose, the contact surfaces may be circular, for example.

The purpose of this measure in both cases is that the second longitudinal position 78 lies in the measurement plane 52 when the board 24 is transferred from the cross conveyor 12 to the longitudinal conveyor 16. Thus, a clear association between the pivotal movement of the straightening arms 40r and 401 and the position of the bearing points 68r and 681 is given, which allows a defined alignment.

The measuring device 50 first determines which width b the board 24 has. From the values of the width b, as already mentioned, an optimal alignment of the board 24 on the longitudinal conveyor 14 is determined, which by means of the straightening arms 4Or and 401 and z .B. of the attacking at the other end of the board further Richtarmpaars should be set.

In Fig. 3, a longitudinal position 78 'is shown on the right, at which the straightening arms 4Or and 401 were first applied to the edges 56r and 561. The measuring device 50 had first determines in which lateral position the board 24 should be aligned. This lateral position is expressed at a distance X ₁ between a center 80 'and a point 82, wherein the center 80' lies on the center line 58 and the point 82 on the longitudinal axis 16. By moving the frame 60 in the direction of the arrow 64, the first application of the straightening arms 4Or and 401 to the edges 56r and 561 has achieved that the board 24 with the contact points 68r 'and 681' in the measuring plane 52 'and the longitudinal position 78', respectively. came to rest. Alternatively, this is possible because of the profile of the contact surface 66r, 661 used also by an individual servo-motor setting of transverse directional straightening transversely to the conveying direction.

The board 24 had at this moment in which it was passed from the cross conveyor 14 on the longitudinal conveyor 14 and the directional arms 40r and 401 applied, in the longitudinal conveying direction 15 nor the speed zero. In order to accelerate the board as fast as possible to the speed of the longitudinal conveyor 14, the conveyor chains 74 were turned on until the speed of the board 24 and the longitudinal conveyor 14 were the same.

During this acceleration process, in FIG. 3 the movement of the abutment points 68r '/ 681' to 68r / 681, the frame 60 had to be traced in the direction of the arrow 64 because the center 80 'was transverse to the longitudinal conveying direction 15, ie in the illustration FIG. 3 had emigrated from point 84 about the path X ₂ to 80. In the Figs. 4 to 8, the process of cyclically conveying by means of the stop hooks 34 on the first conveying section 30 is shown.

In Fig. 4 it can be seen that the stop hook 34 shown there is pivotable about an axis 90, which extends transversely to the transverse conveying direction 13. The pivoting movement is indicated by an arrow 92.

The stop hook 34 has a rear portion 94 in the region of the axis 90 and a front portion 96. The front portion 96 terminates at the free end of the stop hook 34 in a stop 98. At the top of the stop hook 34 is located in the transition between the sections 94 and 96, a ramp in the form of a roller 100 which is rotatable about an axis 90 extending parallel to the axis 102. On the front portion 96 is an insert 104.

The cross conveyor 12 defines a support plane 106 on which the boards 24 are conveyed. This support plane 106 is represented in the region of the transverse conveyor elements 20 and 22 by conveyor chains. In modern conveyor chains, which are designed for very high conveying speeds, the conveyor chains must be similar to a saw sharp teeth designed to ensure the transport of the boards. On the other hand, this means that a resting on the conveyor chains board, which is held firmly by a stop in the conveying direction 13, would immediately damaged by such a conveyor chain or even machined. For this reason, the stop hooks 34, in particular in the region of the insert part 104, are provided with a bearing surface 108 which is lifted off the support plane 106 by a distance z, as shown in the enlarged detail 110 in FIG. 4 clearly visible. The support surface 108 may additionally be provided with a slip-resistant covering 112. At the downstream end, the support surface 108 is limited by the stop 98.

Fig. 4 now shows a first operating position of the stop hook 34. The stop hook 34 is pivoted in the direction of the arrow 92 upwards. In this first operating position, the support surface 108 is in the manner already described at a distance z above the support plane 106. Also, the roller 100 protrudes above the support plane 106 also. In this way, in this second operating position, boards are conveyed away via the roller 100, stopped on the contact surface 108 on the stop 98 and can not be conveyed over the stop hook 34.

In contrast, FIG. 5 shows a second operating position in which the stop hook 34 'is pivoted downward in the direction of the arrow 92'. In this second operating position, the entire stop hook 34 ', at least the bearing surface 108' and the roller 100 ', below the support plane 106. Thus, in this second operating position boards unhindered in the support plane 106 on the stop hook 34' away be encouraged.

Fig. 5 further shows that the support surface 108 may be provided with an anti-slip coating 112. In the Figs. 6-8, the process when stopping a board 24 is shown in detail.

FIG. 6 shows a board 24/1 arriving in the transverse conveying direction 13. Its leading edge is denoted by 114 and the trailing edge by 116. The center of mass of the board 24/1 is indicated at 120. Furthermore, a signal generator 122 can be seen in the region of the stop 98. The buzzer is mounted so that it will emit a signal when a trailing edge of a board passes it.

Normally, the stop hook is in its second, lowered operating position 34 ', in which the boards 24 can be conveyed freely. However, if a certain distance to the previous board is to be established, for example because the next board is too short a distance, the stop hook is extended to the raised first operating position to stop the next board until the required distance from the previous board Board is restored. In order to avoid interference, the procedure is such that the stop hook located in the lowered operating position 34 'is electronically locked. In a first stage, this lock is released and then, if necessary, the stop hook in a second stage in the raised first operating position swung.

In Fig. 6, this means that each time a board with its trailing edge passes by, the signal generator 98 releases the associated stop hook 34 ', so that it can then be extended, if necessary. If this happens, the in Fig. 6 drawn drawn situation available.

The in this situation from the left incoming board 24/1 runs with its leading edge 114 on the roll 100 on. Fig. FIG. 7 shows that this lifts the board 24/2 with its leading edge 114. The center of gravity 118 is still upstream of the roller 100. In the situation of FIG. 8, the center of gravity 118 has passed the roller 100, with the result that the board tilts 24/3 clockwise to the right and touches with its leading edge 114 on the support surface 108. As a result of its momentum, the board 24/3 continues to run on the support surface 108 until it comes to a standstill at the latest when the leading edge of the board 24/4 runs onto the stop 98. From the tipping of the board 24/3 this is certainly out of engagement with the running in the support plane 106 conveyor chain and their sharp drivers.

It is understood that the previously described function of the stop hook can also be advantageously used for separating the boards.

Claims

claims

1. straightening table for wood products, in particular wood-edged boards (24), with a longitudinal conveyor (14), whose longitudinal axis (16) defines a conveying direction (15) arranged on both sides of the longitudinal conveyor (14) straightening arms (40) for laterally detecting and aligning the Wood products in a predetermined position relative to the longitudinal axis (16), wherein each directional arm (40) about an axis (42) is pivotable and with a contact surface (66) in a point (68) to an edge (56) of each on the Longitudinal conveyor (14) applies applied wood product, characterized in that in the direction of the longitudinal axis (16) measured distance (d) between the point (68) and the axis (42) is kept constant when the wood product passes the directional arm (40) ,

2. straightening table according to claim 1, characterized in that the axis (42) in the direction of the longitudinal axis (16) spatially fixed the contact surface (66) is formed such that the distance (d) is kept constant when the pivot angle (φ) of the directional arm (40) changes because the edge (56) is inclined at an angle (γ) to the longitudinal axis (16).

3. straightening table according to claim 2, characterized in that the bearing surface (66) is formed as involute.

4. straightening table according to claim 1, characterized in that the axis in the conveying direction and transversely movable and the pivot angle for each straightening arm is individually adjustable.

5. straightening table according to claim 4, characterized in that the contact surface is circular.

6. straightening table according to one or more of claims 1 to 5, characterized in that in the direction of the longitudinal axis (16) constant position of the point (68) in the transfer of an upstream of the longitudinal conveyor (14) arranged transverse conveyor (12) on the Longitudinal conveyor (14) with a measuring plane (52) of a measuring device (50) on the transverse conveyor (12) is aligned, wherein the measuring plane (52) for detecting the width (b) of the wood product in the measuring plane (52).

7. straightening table according to one or more of claims 1 to 6, characterized in that in each case a pair of on different sides of the longitudinal conveyor (12) arranged straightening arms (4Or, 401) on a common frame (60) is arranged, and that the frame (60) in a direction (64) transversely to the longitudinal axis (16) is movable.

8. straightening table according to claim 7, characterized in that the frame (60) is movable such that when first applying the straightening arms (4Or, 401) to the edges (56r, 561) of the wood product, the points (68r, 681) are substantially symmetrical about a center line (58) of the wood product.

9. straightening table according to claim 8, characterized in that the frame (60) when passing the wood product on the straightening arms (40r, 401) is adjusted by that path (X ₂ ) by which the center line (58) from that position (80 '), which she had taken on the first mooring.

10. straightening table according to one or more of claims 1 or 3, characterized in that the straightening arms are mounted fixed in space and individually rotatable by means of servo drives.

11. straightening table according to one or more of claims 1 to

10, characterized in that the straightening arms (4Or, 401) are uniformly verschenkbar in opposite directions.

12. straightening table according to one or more of claims 1 to

11, characterized in that only two pairs of straightening arms (40) can be applied to a wood product.

13. straightening table, in particular according to one or more of claims 1 to 12, characterized in that in the region of the contact surface (66) of each directional arm (40) is arranged a conveying element.

14. Riσhttisch according to claim 13, characterized in that the conveying element as around a curved contact surface (66) running around conveyor chain (74) is formed.

15. straightening table according to claim 13 or 14, characterized in that the conveying element is actuated for a short time to accelerate the on the longitudinal conveyor (12) laid timber product from standstill to a conveying speed of the longitudinal conveyor (12).

16. Straightening table according to one or more of. Claims 1 to 15, characterized in that the straightening arms (40) are applied with a pressing force to the wood products, which substantially corresponds to the weight of the timber products.