DK158602B - Method and apparatus for aligning elongated timber elements - Google Patents

Description

in

DK 158602B

The invention relates to a method in accordance with the preamble of claims 1 and 2 and to an apparatus for carrying out these methods. Elongated wooden elements are e.g. boards, embellishments, beams, posts, moldings 5 and the like or models or wooden parts for furniture or special wood structures.

The problem of correcting tree elements in relation to saws is already dealt with in DE publication 23 21 309.

With the apparatus shown therein it must be possible to reduce the waste from the precious raw material wood to a minimal value.

This known method can also be used in particular to produce short pieces or posts from split wood blocks *

In the method known from DE publication 23 21 309, an apparatus is used which has a transporter 15 consisting of two parallel endless conveyors. On this transverse conveyor, the wood elements to be machined are fed to a longitudinal conveyor perpendicular thereto. This length conveyor is a roller or roller conveyor having a plurality of spaced apart spaced parallel to each other conveyor rolls or rollers, on whose upper side such wood elements supplied by the cross conveyor are supplied to the processing station. In the area of the endless cross conveyors there is an optical sensing system and this controls two positioning devices arranged on the longitudinal conveyor in relation to the transverse conveyor.

These position adjusting devices are adjustable stops against which the wooden elements are applied by means of the transverse conveyors to align these wooden elements on the rollers or rollers of the longitudinal conveyor relative to the machining stations. In this arrangement, the upper end of the endless transverse conveyors and the common tangential plane of the rollers or rollers of the longitudinal conveyor shall lie in one plane. When supplying the wooden element to the longitudinal conveyor, the rollers or rollers of this conveyor must be stationary so that the wooden elements can be applied against the position setting devices. In this way, in the last transport section there may be a

DK 158602B

2 late frictional resistance, which is a disadvantage. Furthermore, a very significant disadvantage is that the position adjusting devices for adjusting have in series coupled fluid-driven working cylinders. These position adjusting devices, which in practice are projected, cannot be arbitrarily set, but only within the interval stage. The smallest interval stage is hereby determined by the stroke length of the smallest cylinder. The wood elements cannot be precisely aligned, but only occupy a position which is approximately aligned within predetermined intervals. Furthermore, a setting is only possible with a mechanical stop. No shock setting can occur.

Both the cross conveyor and the rollers or rollers of the length conveyor must be stopped. In order to transport the wood element 15 longitudinally to the processing stations, the length conveyor must then be started. The timber element which is not aligned precisely with respect to the machining station can travel further out of the correct position relative to the reference line during transport on the roller or roller conveyor, which in turn poses a disadvantage. Since no further control is foreseen, during transport on the roller conveyor, transverse movement components occur.

In the earlier patent application DE disclosure 32 25 17 281, an apparatus for correcting a saw board, especially a model, is described. A length conveyor is provided for the model to which the model must be loaded manually. The model is aligned using two rollers placed on the side and taken to a measuring station. Before pushing the model forward to the cutting tools, it must be adjusted in a similar manner to ensure maximum yield. By means of the measuring device, transverse conveyors disposed between longitudinal conveyor sections are controlled, which are solely intended to displace the wooden elements or models already placed on the longitudinal conveyors to a corresponding position which 3

DK 158602 B

is aligned with the cutting tool. A transport of the trse elements on the longitudinal conveyors in a predetermined manner by means of transverse conveyors is not envisaged.

There is a need for a more accurate and faster working rectification method, operating without an adjustable stop and using a single apparatus to perform this method. SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems therein, excluding the disadvantages of the known method and apparatus.

According to the invention, this task is solved by the method of claim 1 and the apparatus for carrying out this method.

Advantageously, the alignment is made without impact by the different movements and operating modes of the transporters carrying the wood elements. These transporters can e.g. rotating the longitudinal axis of the tree elements in any desired manner about a vertical axis to align these tree elements relative to a predetermined reference line. The length conveyors are not 20 rollers, but also endless conveyors which run parallel to each other and, at the same time after the acquisition, exert forced control forces on the wooden elements. These length conveyors should not be stopped, but can run continuously. In a particularly advantageous way, the upper runs of these longitudinal conveyors in certain areas are trough-shaped downwardly and through these regions the transverse conveyors which can be controlled can be raised and lowered. The transverse conveyors may, in a first operating position in which their upper run extends above the upper run of the longitudinal conveyors, guide the wood elements into the created position relative to the reference line determined by the machining station. Thus, the wood elements reach the longitudinal conveying position of the machining stations above the longitudinal conveyors. Once this created longitudinal transport position is reached, the transverse conveyors can be stopped and lowered so that the elongated wooden elements thereby impact-free

DK 158602B

4 way is delivered to the length conveyors. Depending on the shape of the elongated wood elements, for a desired alignment, movement sizes are simply controlled for the transporters capable of performing a controlled stop-start operation. It is no longer necessary to set mechanical stops that cannot be continuously adjusted longitudinally, but can only be set to discrete interval positions.

Since no mechanical impact is found, undesirable kickback effects are also excluded.

10 The optical sensing used for controlling the wood conveyors can be done as follows. By "er position" is hereinafter defined the position that certain points on the applied wood element occupy before erection and by "shell position" the positions which one wishes these points to occupy.

15 In several locations in the transverse direction of the transporter, it is possible to determine er positions for certain parameters of the elongated wood elements as they pass through the optical sensing stations.

These parameters may be specific projecting or also characteristic locations on these elongated wood elements. These particular positions can then be compared in the control means with predetermined shell positions which are referred to the desired alignment relative to the reference line. The result of this comparison can be utilized to control the movement of the transporters to bring them to the shell position during the transport of the 25 elongated wooden elements.

As the transport speeds and sensing locations and locations of the transport position across the longitudinal conveyor are known, the control can thereby automatically decrease the speed and stop the transporters when the wood element has reached the longitudinal transport position with the desired alignment relative to the reference line. However, micro-switches for disconnection may also be provided when the elongated tree element has reached this transport position. Another control option is that the running tree elements at an initial sensing station every 5

DK 158602 B

is then captured by an optical transducer attached to a transporter, which then activates the associated transporters.

In a further sensing station in the area above the longitudinal conveyor, the conveying speed is reduced by a further 5 sensing at each transverse conveyor. Finally, with the aid of a final position sensing means, the transporter associated with each time is stopped. In the final position thus obtained, a transfer is then made to the longitudinal conveyor by lowering the transverse conveyors.

Of course, more than two can be used, e.g. four or six transporters. In this connection, the control means advantageously control only the two outer transverse conveyors which are closest to the ends of the transported wood elements. Those in between transporters remain inactive. These transporters can stand still in the lowered position. Optical sensing stations at the two driven transporters control them so that the wooden element on these two transporters is carried into the longitudinal transport position.

In a particularly advantageous way, the lowering of the transverse conveyors 20 for transferring the wooden elements to the longitudinal conveyors can be carried out in several steps, thereby ensuring a shock-free delivery to the longitudinal conveyors. In particular, in order to simplify the lowering, this can be accomplished in two steps. A quick step is completed, which is followed by another slower step 25 of application. This speeds up operation and partly ensures as much as possible shock-free application of the elongated wood element to the length conveyor.

It may be particularly advantageous for the feed to the transporter to be carried out by means of a second transporter inserted in the front. This second cross conveyor may supply the wood elements from a warehouse or other processing station. In this way, the cross conveyors used for steering, which immediately extend into the longitudinal conveyors, can be kept optimally short. Their length measurements then simply depend on the desired rectification amplitude and the operating speed.

DK 158602B

6

The optical sensing of the elongated wood elements can in this connection be carried out in the region of the second transverse insertion in front and / or in the region of the longitudinal transverse guide transverse conveyor. The controlling transporters carry out a start-stop operation in this connection. In this way, these controlling transporters are put into operation and controlled by receiving an elongated wooden element. This can be initiated via the control. From the optical sensing station in the region of the transverse transducer inserted in front, corresponding signals can be applied to the control showing that a tree element is supplied to the controlling transporters at a certain speed. By knowing the distance of the optical sensing station from the inlet of the controlling transporter, the exact time at which the inlet of the wooden element in these controlled transporters is determined is determined. A corresponding synchronous connection of the transporters can then be carried out. But it is also possible at the inlet locations of these controlled transporters to provide micro-switches or optical sensors or otherwise working presence sensors which then trigger the start of these controlled transporters. In a similarly controlled way, these are then stopped again.

For edging, ie in order to remove sloping edges from blocks, boards, planks and similar objects, one can optically sense upper and / or lower, front and / or posterior cut flat edges. When at one time you only have to cut one edge cut, it is sufficient to feel one cut edge edge. But it is also possible in the method according to the invention and the apparatus according to the invention simultaneously to edge two above 30 one another, ie. parallel edges. In this way, an alignment can be carried out such that either one edge is optimal or that both edges extend somewhat obliquely to the machining stations so that with a predetermined alignment there is minimal loss calculated by the control means. In such an alignment process, both the leading and the trailing cut edge edge are sensed.

7 DK 158602B

Optical sensing methods that can be used are described e.g.

1 DE publication 23 23 309 and in DE patent 29 28 085.

In addition, according to the invention, another solution for the above-mentioned purpose is proposed by the method of claim 2 and the apparatus for carrying out this method.

In this alternative method, advantageous continuous transporters which can be driven by a single drive motor are advantageously employed. Between each transporter 10 intermediate carriers are arranged. The upper race of the transporters can be lowered from a plane above these intermediate carriers to a plane which lies below these intermediate carriers and then in a controlled manner is again raised out of this and up into the former plane. Furthermore, the intermediate carriers together with the upper running of the transporters can also be raised and lowered in a controlled manner in the areas of the trough-shaped switching points of the longitudinal conveyors. Next to each transporter, two optical sensing stations are provided in the transport direction behind each other. Now reaching an elongated tree element with a characteristic parameter, e.g. with a particular location of the leading edge, first one or other of the first optical sensing stations passes, then the running speed of all transporters is decreased. The tree element then runs on, and as soon as some characteristic location is detected by the other sensing station which determines that this location runs into the final position, the drive connection between the associated transporter and the tree element is interrupted. At this location, the wood element is not carried further, but is simultaneously placed on an intermediate carrier. Such interruption of the drive connection may advantageously occur 30 such that the upper barrel of the cross conveyor first extends above the carrier, and that this upper barrel of barrel is lowered below the upper or support edge of the intermediate carrier, so that the wooden element at this location is deposited therebetween. -bæreorgan. This process is now repeated in one or another sequence by all the other transporters until it is lateralized.

DK 158602B

8th drive interrupt has occurred until the upper race of the last transporter is lowered below the associated intermediate carrier.

This method allows for a very substantial simplification of the apparatus costs while at the same time maintaining an optimal alignment accuracy. Pr. conveyor is now required only two sensing stations and there is only a mechanical effect on the upper conveyor of the cross conveyor and on an associated intermediate carrier. The mechanics required for this can be designed in a very simple and robust manner. Furthermore, it is possible to carry out this approach with high working speeds, because thanks to the two running speed steps, only small transport speeds work in the short interval where the wood element is lowered.

The apparatus for carrying out the method has endless longitudinal conveyors arranged parallel to one another. In principle, roller or roller conveyors are not used. In order to enable a seamless supply by means of endless cross conveyors, these longitudinal conveyors each have at least two spaced apart groups 20 arranged in a line perpendicular to the direction of transport. In these areas, the upper races are guided downward trough-shaped guides. - The raised and lowerable and steerable cross conveyors can then extend through these areas. The transverse conveyors can traverse the length conveyors at any height above 25, below, and in the transport plane of the longitudinal conveyors without interfering in a continuous manner with the continuous conveyors.

Specifically, the downwardly trough-shaped guides may be slide guides whose inlet and outlet are in one plane. These sliding guides 30 can advantageously consist of a tear-resistant, self-lubricating plastic material. This enables a simple manufacture of the longitudinal conveyors with a guarantee of uninterrupted operation.

9

DK 158602 B

The endless length conveyors may advantageously be chain conveyors carrying pointed carriers carrying the wood member. Thereby, all length conveyors can be driven by a single drive motor. This greatly simplifies the entire structure 5 of the system. A significantly more complicated drive structure would be obtained when, each time between the transporters, endless longitudinal conveyor sections which were to be operated separately and synchronously relative to each other were placed in between themselves. In order to obtain a shock-free and safe introduction of the wood elements into the machining stations, in the area of the delivery ends of the longitudinal conveyors between them and the inlet ends of the machining stations, a holding means for the elongated wood elements may extend. In a particularly advantageous way, these holding means for securing a safe supply of the wood elements into the processing station can be designed as a drive. This is of particular importance for shorter wood elements, as this ensures a forced transport into the processing station.

Advantageously, the transverse conveyors may be formed 20 such that the upper and lower runs of these transporters extend through the trough formed by the trough-shaped guide. It is also advantageously possible that, in an alternative embodiment, only the upper conveyor upper run extends through the trough formed by the trough-shaped guide. The associated lower 25 runs below the guide sole of the trough-shaped guide so that transverse conveyors in this region practically enclose or surround the longitudinal conveyor.

In the former method, each transverse conveyor may be particularly advantageously housed in a rack which can be raised and lowered by a fluid driven piston. These pistons can be operated pneumatically or hydraulically and are controlled by the control means. Each controlling transporter is driven by a motor controllable by the control means.

DK 158602 B

Advantageously, each cross conveyor may be a chain conveyor having specially pointed / into the wood member leading carriers.

At least one optical feeder station is each time connected to the one or both transporters. The location and design of these sensing stations depends on the desired mode of operation. Due to the particular advantage, it is preferred to use in the optical sensing stations height adjustable light sensors which emit a light beam perpendicular to the transport device and which have a precisely defined measuring beam length with background blinding. The cut edge edge is safely detected between the upper and lower cut surface, respectively, and the natural inclined edge. This sensing depends on the thickness of the wood element and responds at the inlet of a predetermined or 15 shell thickness.

The apparatus for carrying out the alternative method is designed such that the upper running of the transporters is guided in a guide rail. Along this guide rail, a holding rail can now extend as a middle carrier. The guide rail can be raised and lowered relative to the holding rail, so that the upper runner of the cross conveyor can be raised and lowered so that one of this carried wooden element can be deposited on the holding rail at the immersion. Furthermore, the holding rail and guide rail in this connection can be enclosed so that they can be raised and lowered jointly.

25 There are numerous constructive possibilities for this.

For example, be provided with separate and specially controlled working pistons for guide rail and holding rail carrying out the joint and mutual immersion.

A particular and robust embodiment has two parallel shafts 30, each with an angular lever arm. These angular bar arms have downwardly extending legs and these two barbell arms are interconnected via a push bar so that they can be pivoted together. One of these downwardly extending legs is connected to a drive piston. When this drive

DK 158602 B

11 is operated in a controlled manner, the angular lever arms are pivoted in a similar manner. These angular lever arms have approximately horizontally extending legs and each of these legs has two hinge locations for supporting members for use on the holding rail and for the guide rail. These carriers are each in corresponding locations, e.g. close to the ends, connected to the holding rail and the guide rail, respectively. The hinge locations of the support rail carriers have a smaller distance from the shaft than the hinge points of the guide rail carriers. In this embodiment, when the angular lever arms 10 are pivoted, the guide rail carrying means, due to the greater radial distance from the shaft, performs a greater stroke than the holding rail carriers. In this case, at an initial oscillation, the angular lever arm of the guide rail can be lowered so much in relation to the holding rail that the upper race of the transporter will lie below this holding rail. The movement can then be stopped in a controlled manner. In the final phase, a further oscillation of the angular lever arm lowers the guide rail and the holding rail jointly. This causes the wooden element to be laid on the length conveyors.

20 The transverse rollers of the transporters are mounted in place and a retraction roller set is driven by a single controllable drive motor. To ensure the uptake and control of the wood elements, the upper edges of the holding rails may be nails.

In this embodiment, the cross conveyors, which may be the chain conveyor, necessarily have a suspension. The traverse of the transporters can be spread by spring force.

Approximately in the middle of the transverse conveyors there may be provided in this connection a compression spring which with one end rests against the guide rail and whose other end e.g. 30 carries a sliding shoe which rests against the lower run.

The subject of the invention is explained in more detail below with reference to the drawing. This one shows in

DK 158602B

12 FIG. Fig. 1 is a schematic top view of an embodiment of an apparatus for carrying out the method; 2 is a schematic section along line II-II of FIG. 1, omitting parts such as, in particular, machine stands, drive connections and bearings not required for understanding; Fig. 3 is a schematic side view of a section along line III-III, showing the principle of rerouting a conveyor inlet; Figure 4 is a schematic side view of a preferred light sensor device according to the invention, used as a sensing device in an optical sensing station; 5 is a schematic side view of an embodiment of the transporter; and FIG. 6 is a schematic view of the line A-B in FIG. 5 shows a cross-conveyor section.

FIG. 1 and 2 diagrammatically illustrate an apparatus by means of which a tree element 1, which is to be edged, is to be supplied to work stations 3 and 4, respectively, arranged in a rack 2. The edge of the tree element 1 must be optimal, ie. that a minimum loss must be worked. For this purpose, determined edges of the tree element 1 must be positioned in a predetermined manner relative to the workstations. In order to carry out such a placement, the tree element 1 is created relative to a reference line 16. In the embodiment shown, the reference line 16 is determined by the processing station 3.

In the illustrated embodiment, the wooden elements 1 are controlled from a storage by means of transverse conveyors 17 and supplied to the controlling transporters 8. These transverse conveyors 17 consist of a few endless conveyors 52 which are redirected by the reference numeral 54. These redirection points 54 may lie 13

DK 158602 B

between the transverse conveyors 8 so that the wooden element 1 can be easily delivered by the transverse conveyors 17 to the transverse conveyors 8. The transverse conveyors 8 extend to the longitudinal conveyors 5, which are intended to supply the 5 elongated wooden elements 1 to the processing stations 3 and 4, so that they are directed. in. Each transverse conveyor 8 is housed in a rack 30 which can be raised and lowered by means of fluid-driven cylinders 29 in a manner described further below.

The length conveyors 5 are also endless conveyors. Both conveyors 5 and 8 are preferably chain conveyors and may have pointed carriers which are schematically represented by reference numerals 34 and 51. These pointed carriers engage the wood member so that it can be guided and guided safely. For each conveyor 8 there is a controllable drive motor 31, so that the individual cross conveyors 8 can be driven independently of one another at different speeds and / or transport directions.

Of particular importance is the design of the places where the transverse conveyors 8 cross the longitudinal conveyors 5.

As shown in FIG. 3, the upper bores 6 of the longitudinal conveyors 5 are in areas 11 which in the transport direction lie in one line downwardly directed trough-shaped, e.g. V- or U-shaped. To this end, on the frame not shown carrying the longitudinal conveyors 5 in the area of the upper race 6, trough-shaped guides 24 are provided, the inlet 25 and the outlet 26 being at the same level. The upper conveyor 6 of the longitudinal conveyor 5 extends before the inlet with its conveying surface in the plane 14 and after it exits from the guide 24, this again extends in the plane 14, which is schematically shown in FIG. 3. The guide 24 has a guide sole 27 down to which the upper race 6 is guided. From there, the upper race 6 extends upward again. This guide is preferably a slide guide and can be made of a tear-resistant self-lubricating plastic. This simplifies the production of this board. At the same time, the service life is increased.

DK 158602 B

14 The sole section 27 is shown in FIG. 3 so wide that a transverse conveyor 8 can extend transversely through the trough 28 formed by the guide 24.

The device can hereby be such that both the upper run 9 of a transverse conveyor 8, as well as its lower run 10, extend through this trough 28. But this is also, as schematically indicated in FIG. 3, it is possible to design the system such that the upper run of an transverse conveyor 8 extends through the trough 28. The lower run 10 'extends below the sole section 27 of the guide 24. The transverse conveyor 8 encloses or runs around the upper run 6 of any longitudinal conveyor 5.

The transverse conveyors 8 can be raised and lowered in these areas 11. A raising and a lowering is done by the working cylinders 29 which can raise and lower each rack 30. In an upper position of the transverse conveyors 8, the conveying surface of the upper runner 9 lies the transverse conveyors 8 in a plane 13 clearly above the plane 14 in which the conveying surfaces of the longitudinal conveyors 5 of the longitudinal conveyors 5 extend. In this position, the wooden elements 1 of the transverse conveyors 8 are introduced in 20 longitudinal conveying positions above the longitudinal conveyors 5.

When this longitudinal transport position is reached, the operation of the transverse conveyors 8 is stopped, cf. below. Then, the transverse conveyors 8 are lowered after the conveyors 8 are lowered in one or more steps, the plane of the conveying surface of the upper run 9 of these 25 transporters 8 is clearly below the plane 14 of the conveying surfaces of the longitudinal conveyors 5 of the upper run 6. According to this, the wooden elements are laid. 1, which is introduced by the transverse conveyors 8 in the longitudinal conveying mode, forcibly by the longitudinal conveyors 5. The longitudinal conveyors 5 are operated continuously.

Between the discharge ends of the longitudinal conveyors 5 and the insertion end of the working stations 3 and 4 are provided holding means 33 which can be designed as drive means. These holding means 33 serve to properly supply the created wood elements 1 to the machining stations. This is especially important for short tree elements.

DK 158602 B

15

For operation of all length conveyors 5, only a single driver note 35 is required.

As shown in FIG. 1 and 2, optical sensing stations 32 are provided. These optical sensing stations may be located above the transverse transporters 17 and / or transverse transporters 8. The location and design of these optical sensing stations depends on the desired mode of operation.

In the FIG. 1 and 2, at different locations in transverse direction of the tree element 1, the optical sensing station 32 can determine the instantaneous geometric position of the tree element 1, hereinafter called "er position" with respect to the reference line 16. Corresponding signals are then applied to the control means 15 via a line. 54. In this control means, e.g. a program containing the position that these 15 points of the tree element 1 must occupy relative to the reference line 16, which position is hereinafter referred to as the "shell position". The control means finds out the difference values between the er and shell position. On the basis of these difference values, 56 command signals are provided to the controllable 20 motors via the line 31. These command signals can all depending on the incorrect alignment of the wooden element 1, e.g. give the command that the extremely located transporters 8, ie. those closest to the ends of the wood element are driven in a very specific way. Thus, the transporter 8, which when viewed 25 in FIG. 8, is to the left, successively operated at different speeds, which also applies to the right-hand transporter 8. The transverse transporters located therebetween remain inactive. These cross conveyors 8 remain submerged and not operated. Thereby, the desired alignment can be made relative to the reference line 16. The duration of the controlling influence of the transporters 8 is determined by the control means 15.

DK 158602 B

16

However, this mode of operation can also be controlled by means of the optical transceivers attached to each of the transverse transducers 8, which are mutually arranged along these transverse transporters. These sensing stations can determine the inlet of an edge section of the tree element 1 at the transporter 8 and allow the associated transporter to run at a predetermined speed. This control is dependent on the edge section inlet at that or another cross conveyor 8. Additional optical sensing stations can, at edge section through, change the rpm of the 10 associated motors or stop the engine's final position at the edge inlet.

The control means 15 can also, when the wooden elements 1 are placed on the transverse conveyors 8, activate the motors 31. When passing through the optical sensing station 32, a presence signal can be delivered to the control means 15. Since the control means knows the distance to the location where the presence signal is read, from the inlet of the transporter 8, and also the transport speed of the transporters 17, the control means can switch on at the correct time. the conveyors 8 and guide them in the necessary manner.

However, the switching on of transporters 8 can also, if desired, be done via micro switches or other optical and electrical sensing elements.

As soon as the tree element 1 above the longitudinal conveyors 5 has reached its correct longitudinal transport position, which is predetermined by the reference line 16, stop signals are sent to the motors 31 via the control means 56 or from other optical sensing stations 31 via the lines 56, the pumps 57 can receive command signals which causes the fluid-driven 2Q cylinders 29 in one or more steps to lower the racks 30. Thus, the transverse conveyors 8 are included in the manner described above.

DK 158602 B

17

In order to ensure that the wooden elements 1 are deposited on the longitudinal conveyors 5 which run continuously without shock, the immersion of the racks 30 and thus the transverse conveyors 8 is incremental.

In particular, the immersion may be programmed in such a way that this occurs in two steps. In a first step, it is lowered quickly until the plane 13 is close to the plane 14. Then the lowering is slowed down to allow the wooden element 1 to gently lower on the longitudinal conveyors 5.

If the two edges of the wooden element 1 are to be angled simultaneously, the wooden element 1 can be brought to one predetermined position with respect to the reference line 16. This reference line 16 is determined by the processing station 3. To edge the parallel edge thereof, after a width measurement of the tree element 1 at the optical sensing stations of the control means 15 via the line 15 sends a command signal to the transversely slidable processing station 4. This sets the distance D from the reference line 16 so that the other edge of the tree element 1 can also be optimally offset.

Optical sensing of the position of the wood element 1 may occur 20 above the transverse conveyors 8. In addition, additional optical sensing stations may be provided in the transverse direction relative to the transverse conveyors 8 and 17. These may enable fine tuning after a rough setting or determine that shell position is reached.

The optical sensing is preferably designed such that the inlet of the wooden element 1 in the final position is determined at a predetermined location. Then transverse transporters are stopped in succession. Other transporters are further driven to bring other points of the tree element into the correct end position, so as to finally reach the desired alignment relative to the reference line 16. In particular, this work is carried out with two transporters determined by the length of the tree element 1.

DK 158602 B

18

With the basic design of the apparatus - the longitudinal conveyors 5f continuously circulating through which controllable, raised and lowerable transporters 8 are passed transversely - one can solve the most different tasks. In the simplest way, it is possible to design and position the optical sensing stations. Furthermore, the control may be designed in the required manner.

Several such appliances may be arranged one after another to effect a bevel and then a bevel cut of corners or the like.

10 By interfering with the guiding transverse conveyors and longitudinal conveyors 5, a continuous and secure alignment of the elongated wood elements relative to the machining stations is possible and a precisely created supply thereof. This alignment is not limited to incremental approximate values incrementally. Furthermore, by the use of endless conveyors, especially chain conveyors with the penetration of the tree, the correct alignment position obtained in the further transport is maintained.

In the transfer of the elongated wood elements from the transverse conveyors to the longitudinal conveyors, no detrimental tearing effects occur. Also, it is no longer necessary for the erection to produce an edge plant with its uncertainties.

Optical sensing stations which may be used in connection with the subject matter of the invention are e.g. disclosed in DE Publication 23 23 309 and in DE Patent 29 28 085.

As shown in FIG. 4, a wood member 1 is conveyed on the transverse track 8 or 17. This wood member 1 has an upper cutting surface 22 and a lower cutting surface 23 which define the cutting edge edges 30, 18, 19, 20 and 21. This wood member has natural inclined edges 37 and 43 which are to be cut off at the edge. The cutting must hereby be done in such a way that the loss is minimized, that is, as close as possible to the upper intersection edges 18 and 19. The edge 18 is the leading edge and the edge 19 is the following running edge.

DK 158602 B

19

Depending on the program, the transverse conveyors 8 can also be controlled so as to obtain a maximum surface or space meter yield of the blanks.

Instead of the apparatus known from DE-publication 5,221,230 and DE-patent 29 28 085, the apparatus according to the invention can be used according to the invention. 4, preferred light sensing device in the optical sensing station.

Across the transport direction, several light sensors 57 are arranged over the transverse transporters 8 and / or 17. Several light sensors 57 may also be arranged along each transverse trace dry 8 in the direction of transport. controls the operation of the drive motors 31. These light sensors are mounted on motor or manually controlled raising and lowering light sensor carriers 58. Light sensors 57 have a precisely defined measuring beam length 59 and operate with 15 dimming the background. The cutting edge 18 or 19 between the cutting surface 22 and the bevel edge 43 or 37 can be precisely gripped. Depending on the wood thickness D, the light sensor height is set. The bevel edges 43 or 37 are not gripped.

FIG. 5 is a schematic sectional view of one embodiment of the transporter for carrying out the alternative method.

The transporter 8 has an upper race 9 and a lower race 10.

These two races extend between the two location-fixed bypass rollers 63. One of these bypass rollers 63 may be driven. The cross conveyor 9, 10 runs down as shown, so that the operating mode to be described below is possible.

The upper barrel 9 of the transporter 8 is mounted in a guide rail 61. In FIG. 5, two operating positions are shown for the upper barrel 9 and its guide rail 61. The transverse conveyor 8 crosses the longitudinal conveyors 5 in areas 11 in which the upper barrels of these longitudinal conveyors 30 are reluctantly directed downwards. These troughs allow the upper race 9 and also, cf. below, the holding rails 62 to be lowered during the longitudinal conveyors 5 of the upper race.

DK 158602B

20

For lifting the suspension, a compression spring not shown between the upper barrel 9 and the lower barrel 10 can be provided. This compression spring can with one end support the guide rail 61 and with the other end carry a sliding shoe that slides 5 on the lower run 10 of the transporter 8.

The guide rail 61 is supported by two supporting members 77, 79. The holding rail 76 is also supported by two supporting members 76, 78. All four supporting members extend approximately vertically.

On each of the shafts 64, 65 there is pivotally mounted an angular 10 lever arm 66, 67. This angular lever arm has downwardly extending legs 68, 69. The legs 68, 69 are interconnected by a push rod 70 in such a way that it one angular lever arm movement causes the other angular lever arm. The downwardly extending leg 69 of one angular lever arm 67 is in communication with a drive piston 71. The approximately horizontally extending leg 80.81 of the angular lever arm 66, 67 has hinge points 72-75 for the supporting members 76-81.

As shown, the hinge points 72, 74 for the support members of the holding rail 62, 76.78 at each location are closer to the corresponding shaft 64, 65 than the hinge points 73, 75 for the supporting members 61, 79, 79.

This angular bar connection causes that, by pivoting these angular bar arms, the support members 76, 78 for the hold rail 62 will perform a smaller lift than the support members 77, 25 79 for the guide rail 61.

In FIG. 5 and 6, the angular lever arms 66, 67 are pivoted in such a way that both the guide rail 61 as well as the holding rail 62 are in the lower position. In this position, a wooden element is laid on the length conveyor 5.

As the lower legs 68, 69 are pivoted to the right, the connecting line of the hinge points 72, 73 and 74, 75 is pivoted upwardly over an angle.

DK 158602 B

21 Because of the different distances between these hinge points from the associated shafts, in addition to the joint lifting movement, the associated carriers must also compulsorily make a relative displacement relative to each other. The parts then appear in the 5 of FIG. 6 by the dash. Thereby, the upper run 9 of the cross conveyor 8 lies over the upper edge of the holding rail 62, so that a wooden element can be driven in. Once this has reached the shell position, the working cylinder 71 performs a first short stroke sufficient to lower the upper race 10 below the upper edge of the holding rail 62, which may be equipped with spikes. At this point there is then a disruption of the propulsion and the wooden element is placed on the holding rail. At other places, the transport to the final position still continues. As soon as all characteristic points on the wood element have reached their final position and all upper races 9 lie below the holding rails 62 a further blow occurs. At this stroke it is reached in FIG. 5, at which a transfer to the length conveyors was carried out.

In order to obtain a greater strength, the angular lever arms 20 65, 66 were formed as disc shaped elements.

In this mode of operation it is only necessary to place two sensing means, as shown in FIG. 4, one after the other in the conveying direction of the transverse conveyors 8. One of the first sensing devices turned down: saw the transporter running speed. The other sensing means in the transport direction 25 are arranged so that at this point they determine the inlet of the characteristic places on the wooden element in the final position and induce the release of the drive connection between the transverse conveyors and the wooden element. By means of the last other sensing means, the immersion 30 is released by the upper barrel and by the holding rails for placing the wooden element on the longitudinal conveyor 5.

In addition, by optical sensing of the front as well as the trailing sectional edge for simultaneous machining of the two edges of the wood element, the transverse distance from the reference line 35 for a further transverse machining station can be adjusted. Such transverse machining stations are known per se and can be purchased on the market.

Claims (20)

A method of rectifying elongated wood elements in a predetermined manner with respect to at least one reference line determined by at least one processing station, to which these elongated wood elements are successively fed longitudinally by means of a longitudinal conveyor, which in turn receives the elongated tree elements from a transverse endless conveyor in whose transport area provided at least one optical sensing station to determine characteristic parameters determining their spatial location and to control position adjusting devices for the elongated wooden elements of a control means can output signals representing these parameters, characterized in that the elongated wooden element (1) is introduced by means of transverse conveyors (8) into a longitudinal transport position at a distance above endless longitudinal conveyors (5). , that the individual two the speed and / or direction of the conveyors is controlled by means of the control means (15) that the elongated tree element is aligned in a predetermined manner with respect to the reference line (16) and that the transporters (8) after the elongated tree element (1), which is thus rectified and has reached the longitudinal transport position, is stopped and lowered so that the elongated wooden element (1) is laid on the longitudinal conveyors (5). A method of creating elongated wooden elements in a predetermined manner relative to at least one reference line determined by at least one processing station, to which these elongated wooden elements are successively fed longitudinally by means of a longitudinal conveyor 30, which in turn are supplied to the elongated tree elements from a transverse endless transporter conveying in whose transport area provided at least one optical sensing station to determine for the elongated tree elements characteristic parameters which characterize their spatial location and which give corresponding signals to cause and controlling the alignment, characterized in that the long wooden element (1) is inserted by means of the transverse conveyors (8) into a longitudinal transport position at a distance above the endless longitudinal conveyors (5), thereby reducing the running speed of all transporters when in running directions a forward parameter passes through at the first transducer (8) of the respective transducer (8) and the predetermined final position is taken in when the second transducer is reached and drives the connection of that transporter (8) with the elongated tree element (1) ) is disconnected at the same time as the tree element is simultaneously deposited on a intermediate carrier adjacent to this transporter (8), and the intermediate carrier means are simultaneously lowered after the last drive break, so that the elongated tree element (1) is laid on the longitudinal conveyors (5). Method according to claim 1, characterized in that the optical sensing stations (32) at several locations across the transport direction of the transverse conveyors (8) ascertain the positions of certain parameters on the elongated tree elements (1) and compare them with the shell positions provided in the control means (15) relative to the reference line (16) and that the results are used to control the transporters (8). Method according to claim 1 or 3, characterized in that the optical sensing stations (32) determine the inlet of predetermined transverse transverse directions located at locations of the tree elements (1) in the predetermined final position given at the desired alignment. relative to the reference line (16) and therefrom deriving in the control means (15) 30 corresponding command signals for the controlled transporters for the inlet control of the elongated wooden elements (1) in the predetermined created position relative to the reference line (16). Method according to one of Claims 1 to 4, characterized in that, by using more than two transverse conveyors (8), only the two outer transporters closest to the conveyor tree elements are controlled from the control means (15). (1) ends and that those in between 5 remain inactive. Method according to one of claims 1, 3 to 5, characterized in that the immersion of the transporters (8) is carried out in several steps. Method according to one of claims 1, 3 to 6, characterized in that the material is supplied to the transverse conveyors (8) by means of a pre-inserted second transverse conveyor (17) and that the optical sensing of the elongated wooden elements (1) is carried out at the transverse transporter (17) inserted and / or on the transverse conveyors (8) leading to the longitudinal conveyors (5). Method according to claim 2, characterized in that the upper run (9) of a cross-conveyor (8) is moved up and down in a controlled manner between a plane lying above an associated intermediate carrier extending along the upper run and a plane. 20 located below this intermediate carrier. Method according to claim 2 or 8, characterized in that the upper barrel (9) of the transporter (8) and the associated intermediate carrier together are moved in a controlled manner up and down in the area (11) for trough-shaped switching points (24) 25 for the longitudinal conveyors (5). ). Apparatus for carrying out the method according to one of claims 1 to 9, characterized in that at least two parallel, endless length conveyors (5) each in the upper race (6) have at least two spaced apart groups 30 (12) of located on a line perpendicular to the direction of transport (11), in which these upper runs (6) are guided in downwardly trough-shaped guides (24), and raised and lowerable transporters (8) extend through these areas ( 11). DK 158602B Apparatus according to claim 10, characterized in that the downwardly trough-shaped guides (24) are sliding guides of a rubbing-resistant and self-lubricating plastic material and that the inlets and outlets (25,26) lie in a plane. Device according to one of Claims 10 or 11, characterized in that the endless length conveyors (5) are chain conveyors having carriers. Apparatus according to one or more of claims 10 to 12, characterized in that between the delivery end of the longitudinal conveyor (5) 10 and the inlet end of the working station (3,4) is arranged a drivable holding means (33) for the elongated wooden element (1). Apparatus according to one of claims 10 to 13, characterized in that each transverse conveyor (8) is a chain conveyor. Apparatus according to one of claims 10 to 14, characterized in that height-adjustable light sensing means (27) are provided in the sensing stations (32,32 '), which have a precisely defined vertical measuring beam length (59) with dimming the background and which accurately engages the interface surface (18,19) between the interface (22) and the natural inclined edge. Apparatus according to one of claims 10 to 15 for carrying out the method according to claims 2, 8, 9, characterized in that the upper race (9) of the transverse conveyors (8) is guided 25. a guide rail (61) along which as a middle carrier means a holding rail (62) extends that the guide rail (61) can be raised and lowered relative to the holding rail (62) and that the holding rail (62) and guide rail (61) are mounted so that they can be raised and lowered jointly. Apparatus according to claim 16, characterized in that on each of two parallel shafts is mounted an angular lever arm (66,67), whose downwardly extending leg (68,69) is pre-tied by an hinged push rod, that one of these legs (69) is connected to a drive piston (71), that the approximately horizontally extending legs (80,81) of the angular lever arms (66,67) each have two hinge locations (72-75) for supporting members; (76-79) for the holding rail (62) and the guide rail (61), and that the hinge locations (72,74) for the carrying means (76,78) of the holding rail (62) have a smaller distance from the shaft (64,65) than the hinge points (73). , 75) for the guide rail carrying means (77, 78). Apparatus according to claim 16 or 17, characterized in that the guide rollers (63) of the transverse conveyors (8) are mounted in place and that their operation takes place via a single drive motor. Apparatus according to one of claims 16-18, characterized in that the upper edges of the holding rails (62) carry pins. Apparatus according to one of claims 16 to 19, characterized in that the upper running (9,10) of the transverse conveyors (8) is spread by spring force.