EP2982485B1 - Device and method for making chop cuts in work pieces made of wood - Google Patents

Device and method for making chop cuts in work pieces made of wood Download PDF

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Publication number
EP2982485B1
EP2982485B1 EP15002204.4A EP15002204A EP2982485B1 EP 2982485 B1 EP2982485 B1 EP 2982485B1 EP 15002204 A EP15002204 A EP 15002204A EP 2982485 B1 EP2982485 B1 EP 2982485B1
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EP
European Patent Office
Prior art keywords
workpieces
transport
transport device
sawing station
transfer
Prior art date
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EP15002204.4A
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German (de)
French (fr)
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EP2982485A1 (en
Inventor
Alois Heinz
Herbert Locherer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weinig Dimter & Co KG GmbH
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Weinig Dimter & Co KG GmbH
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Priority to SI201530229T priority Critical patent/SI2982485T1/en
Publication of EP2982485A1 publication Critical patent/EP2982485A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
    • B27B1/002—Methods for subdividing trunks or logs essentially involving sawing by cross-cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B11/00—Cross-cut reciprocating saws with power drive; Appurtenances therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B31/00—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines
    • B27B31/003—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines with rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes

Definitions

  • the invention relates to a device for performing cross cuts on wooden workpieces according to the preamble of claim 1 and to a method for performing cross cuts on wooden workpieces according to the preamble of claim 8.
  • a device and such a method are known from the document WO2005113206A1 known.
  • Devices are known in which the transport device for feeding the workpieces to the feed of the chop saw is directly coupled. Such devices have only a low throughput, because the workpieces can not be transported as long as the respective preceding workpiece is processed by the chop saw.
  • the transport device has its own drive, which supplies the next workpiece after a signal of the chop saw. Even with such devices, the throughput is relatively low.
  • devices are known in which the workpieces are fed by means of a controlled drive to the sawing station in such a way that the distance between successive workpieces when transferring them to the chopper saw is small.
  • the invention has for its object to form the generic device and the generic method so that with a simple design and high throughput Kapp Songs for the removal of workpiece errors can be performed reliably.
  • This object is achieved according to the invention in the generic device with the characterizing features of claim 1 and in the generic method according to the invention with the characterizing features of claim 8.
  • the workpieces are transported on the transport device in the direction of the sawing station.
  • a retention / storage unit At the end of the transport device facing the sawing station there is a retention / storage unit. It ensures that the workpieces are held up to her. This has the consequence that the workpieces are arranged in a train one behind the other in such a way that they lie with their end faces together.
  • the transport device with the retention / storage unit thereby forms a buffer area in which the workpieces are first buffered.
  • the retaining / stowage unit is driven independently of the transport element of the transport device, whereby the feed rate exerted by it on the workpieces is smaller than the feed speed generated by the transport element of the transport device.
  • the workpiece string can be formed in a very simple manner.
  • the transfer conveyor Between the retaining / stowage unit and the sawing station according to the invention is the transfer conveyor, with which the workpieces are fed to the sawing station. Since the drive of the transport element of the transfer conveyor is decoupled from the drive of the retention / accumulation unit, there is the possibility of further transporting the workpieces at an accelerated speed. With the retaining / stowage unit, the workpieces are initially fed at low speed to the transport element of the transfer conveyor. As soon as the workpieces are caught by this transport element they are transported on, accelerated. This has the consequence that the workpieces are separated from each other, so that they no longer lie with their front sides together.
  • the drives of the transfer conveyor and the retaining / stowage unit are decoupled from each other or coupled with a translation at speed, the drives can be controlled so that the workpieces are at a minimum distance from the chop saw in the saw station, although the workpieces are on the transport means initially arranged in a strand to each other. In this way, despite a simple design of the device, a high throughput of workpieces can be achieved.
  • the retention / storage unit is formed by a pair of rollers.
  • the two rollers form a roller nip through which the workpieces can be transported. At least one of the two rollers is rotatably driven, so that the workpieces can be reliably conveyed through the roller gap to the subsequent transfer conveyor.
  • the rollers rest against the workpieces under pressure.
  • the transfer transport device has pressure rollers which lie opposite a transport element of the transfer transport device and rest under pressure on the workpieces.
  • the length of the transport element of the transfer conveyor corresponds to at least the maximum length of the workpieces.
  • the transfer conveyor in more advantageous Way provided at least one sensor, which is preferably a photocell.
  • the position of the workpieces can be detected on the transport element of the transfer conveyor.
  • the transport element is driven by a controlled drive, in this way, taking into account the respective position of the workpiece, the distance between successive workpieces can be minimized within the sawing station.
  • the drives of the transport elements of the transport device and the transfer conveyor, the retaining / stowing unit and the transport device are connected to a control in the area of the chop saw in the sawing station. Depending on the available data, it can then control or preferably also regulate the individual drives so that an optimum throughput of the workpieces is achieved by the device.
  • the workpieces are initially dammed so that they form a continuous strand with their front sides lying against each other.
  • the workpieces are then transported individually accelerated so that they again have distance from each other.
  • the workpieces can then be reliably fed to the chop saw in the sawing station.
  • the position of the workpieces is recorded, which is taken into account when feeding the workpieces to the sawing station.
  • a good throughput of the workpieces is achieved when the acceleration of the workpieces is carried out depending on the transport of the workpieces in the sawing station in the field of chop saw. Then, the respective subsequent workpiece can be fed so that the distance to the preceding workpiece is minimal. In this case, the distance is advantageously only so small that successive workpieces in the transfer area to the chop saw within the saw station just do not touch each other.
  • the feed rate of the respective subsequent workpiece is controlled in the sawing station.
  • the control it is possible, depending on the processing time of the respective preceding workpiece in the sawing station optimally adjust the feed rate of the subsequent workpiece.
  • the feed rate of the respective subsequent workpiece in the transfer conveyor is variably controlled, whereby the throughput of the workpieces can be further optimized.
  • the feed rate of the respective subsequent workpiece in the transfer conveyor is continuously recalculated in a controller.
  • the distance between successive workpieces can always be kept small or minimal.
  • controller works with a flowing position tracking of the workpieces. This allows the various drives for the respective transport elements are optimally matched.
  • the measured values of the workpieces are advantageously stored.
  • the detected and stored values can then be used to control the feed rate of the workpieces.
  • the respective subsequent workpieces are fed to the sawing station without interruption of the feed rate in the transfer conveyor.
  • the drive for transporting the following workpieces is advantageously decoupled by means of the transfer conveyor from the drive of the workpieces in the sawing station. This allows the transport of the workpieces within the sawing station in the stop-and-go process, while the supply of workpieces to the sawing station continuously, optionally also with variable speed.
  • the sawing station 2 is preceded by a buffer area 3, in which the workpieces 1 are dammed so that they lie with their end faces 4 together.
  • the buffer area 3 has at least one transport device 5, with which the workpieces 1 are transported in the transport direction 6 in the direction of the sawing station 2.
  • the transport device 5 has a transport element 7, which is an endlessly circulating conveyor belt or an endlessly circulating conveyor belt Chain can be, which is driven in the transport direction 6.
  • a transport element may also be provided a roller conveyor whose driven rollers transport the workpieces 1 in the transport direction 6.
  • the buffer region 3 or the transport device 5 has at the front end in the transport direction 6 a pair of rollers 8 which has rollers rotatable about horizontal axes which are located in the region above and below the transport path of the workpieces 1 in the direction of the sawing station 2.
  • the pair of rollers 8 is driven independently of the transport element 7.
  • the rollers 8 are under pressure at the top and at the bottom of the respective workpieces 1 at.
  • the pressure under which the rollers 8 abut the workpiece 1 is adjusted so that slippage of the workpieces 1 between the rollers 8 is avoided.
  • both rollers 8, but also only one of the two rollers can be rotatably driven about the horizontal axis.
  • the corresponding hydraulic or pneumatic cylinders can be controlled so that the contact pressure of the rollers 8 at the top and bottom of the workpieces 1 is sufficiently high to a slip of the workpiece 1 between to prevent the roles.
  • the rollers 8 are rotatably driven so that the workpieces 1 detected by them have a lower speed than the conveyed on the transport element 7 of the conveyor 5 subsequent workpieces 1. In this way, the workpieces 1 jam like this on the transport device 5 that they lie with their end faces 4 together, as in the Fig. 1 and 2 is shown.
  • the rollers 8 are advantageously rotatably driven by means of a controlled drive, which may be a servo drive, a drive FU or a hydraulic drive.
  • the controlled drive allows an optimal adjustment of the transport speed of the workpieces 1.
  • the control is carried out both in terms of the speed of the transport element 7 and with respect to the transport speed of the roller pair downstream transport device 9, which forms a transfer transport, with which the workpieces 1 of Saw station 2 are passed.
  • the transport device 9 has a transport element 10, which is advantageously an endlessly circulating conveyor belt. Instead of the conveyor belt can also be provided at least one endless circulating chain or a roller conveyor.
  • the transport element 10 is driven so that the resting on her workpieces 1 of the following sawing station 2 are supplied.
  • pressure rollers 11 which rest under pressure on the workpieces 1 during their transport by means of the transport device 9.
  • the pressure rollers 11 are perpendicular to the transport element 10 adjustable. The pressure rollers 11 prevent slipping of the workpieces 1 on the transport element 10.
  • the drive for the transport element 10 takes place independently of the drive of the roller pair 8 and of the transport element 7 of the transport device 5.
  • the drive of the transport element 10 can also be done by means of a controlled drive.
  • the transport element 10 has a length which corresponds at least to the maximum length of the workpieces 1. This ensures that too the longest workpiece 1 rests completely on the transport element 10 and no longer protrudes into the gap between the pair of rollers 8.
  • the pressure rollers 11 are arranged at a distance in the transport direction 6 of the workpieces 1 one behind the other. The distance between successive pressure rollers 11 is so small that even very short workpieces 1 can be detected by the pressure rollers 11.
  • the transport element 10 is driven so that the transported with him workpieces 1 have a higher speed than in the area between the pair of rollers 8. This ensures that the lying in the buffer area 3 with their end faces 4 workpieces 1 before their entry in the sawing station 2 no longer lie with their end faces together, but in the transport direction 6 distance from each other.
  • this is shown by way of example for two workpieces 1 ', 1 "lying one behind the other in the area of the transporting device 9.
  • the left-hand workpiece 1' still rests on the transport element 10 with its rear end in the direction of transport, this workpiece end being moved in the direction of the last pressure roller 11
  • the front end of this workpiece 1 'in the transport direction rests on a transport element 12 against which this workpiece end is pressed by means of a pressure roller 13.
  • the transport element 12 and the pressure roller 13 are already part of a transport device of the saw station 2, with the workpieces 1 of the chop saw are supplied.
  • the workpiece 1 is located on the transport element 10, which is pressure-loaded by the corresponding pressure rollers 11 against the transport element 10.
  • the two workpieces 1 ', 1" on the transport element 10 are separated from each other is reached, that the transport speed of the transport element 10 is higher than the transport speed of the roller pair 8.
  • the still lying in the buffer area 3 workpieces 1 are thus pulled apart on the gap before the workpieces 1 are transported with the transport device 9 in the sawing station 2.
  • the chop saw present in the sawing station 2 performs the required chop-cuts on the workpieces 1 in order to remove bad wood qualities and / or wood defects from the workpiece 1.
  • the bad wood qualities and / or wood defects to be cut out of the workpiece 1 are detected in a station upstream of the buffer area 3 (not shown). This can be done by means of a scanner or in a chalking station.
  • the workpieces 1 are also measured in their length.
  • the length dimensions and the places where the Kappsäge motherboarde to be performed on the workpiece 1 are stored in a controller.
  • the cut list produced in this way is transmitted to the sawing station 2, whose chop saw performs the necessary chop cuts at the required points of the workpieces 1 in accordance with this cut list.
  • the cut list is supplied to a higher-level control, with which the drives of the transport devices 5 and 9 and of the roller pair 8 are controlled.
  • the workpieces 1 have a different number of wood defects. This results in that a different number of Kapp Songs must be made on the workpieces 1 in the sawing station 2. This in turn means that the workpieces 1 are of different lengths in the sawing station 2 before they leave the sawing station. Accordingly, the transport speeds of the respective subsequent workpieces 1 must be set so that the subsequent workpiece 1 does not already then enters the area of the chop saw, while there the preceding workpiece is still processed. On the other hand, the distance between the successive workpieces within the sawing station 2 should be as small as possible in order to achieve a maximum throughput of workpieces in the sawing station 2.
  • the rear end of the workpiece 1 located in the sawing station 2 is monitored in the sawing station 2 by means of a sensor (not shown).
  • a sensor not shown
  • the transport device 9 there is at least one further sensor (not shown) with which the position of the workpiece 1 located in the transport device 9 is detected.
  • the higher-level control can drive the pair of rollers 8 such that the distance to the preceding workpiece 1 is minimized during the transfer of the following workpiece 1 to the chop saw in the sawing station 2. This distance in front of the chop saw is so small that the successive workpieces 1 just do not touch.
  • the workpieces 1 are first measured in terms of their length in the buffer region 3 upstream station. In addition, bad wood qualities and / or wood defects are marked on the workpieces in this area, so that the chop saw in the sawing station 2 performs the Kapp Songse at the required locations.
  • the thus measured and marked workpieces 1 reach the transport element 7 of the buffer area 3 and are transported with it in the direction of the pair of rollers 8.
  • the transport speed of the transport device 5 in the buffer area 3 is greater than the transport speed generated by the pair of rollers 8, so that the workpieces 1 on the roller pair 8, d. H. at the end of the buffer area 3, accumulate on each other and lie with their end faces 4 together.
  • the workpieces 1 are fed by the roller pair 8 of the downstream transport device 9, which is located between the sawing station 2 and the pair of rollers 8 and thus the buffer area 3.
  • the transport element 10 of the transport device 9 is driven so that the transport speed is higher than the transport speed through the pair of rollers 8 is generated. As a result, the successively lying workpieces 1 detached from each other.
  • the transport device 9 From the transport device 9 get the workpieces 1 in the sawing station 2, in which the workpieces via a (only schematically shown) transport means 12, 13 of the chop saw are supplied. It takes on the workpieces 1, the previously marked sections. During the saw cut the workpiece 1 stands still. With several cuts to be made thus the workpiece is transported stepwise.
  • the controller calculates the required feed rate of the respective subsequent workpiece 1 and accordingly controls the drives of the roller pair 8 and the transport device 9.
  • the feed rate of each subsequent workpiece 1 is continuously recalculated in the controller. In this way, the workpieces 1 are always supplied by the transport device 9 of the sawing station 2 so that the subsequent workpiece 1 has only a minimum distance from the preceding workpiece 1, which is still processed by means of the chop saw.
  • the successive workpieces 1 in the transfer to the chop saw only have such a distance from each other that they just do not touch.
  • the gap between the successive, to be machined with the chop saw workpieces is minimized in the transfer of the workpieces to the chop saw.
  • the control or regulation takes place in such a way that the workpieces 1 are fed to the sawing station 2 without stopping.
  • the feed speed of the transport device 9 is advantageously regulated variably, wherein the feed rate is continuously recalculated in the controller.
  • the transport of the respective subsequent workpieces 1 can also be interrupted or stopped.
  • the workpieces 1 are first buffered in the buffer area 3 in such a way that they lie against one another with their end faces 4, a simple supply of the workpieces after the measurement is possible.
  • the pair of rollers 8 ensures that the workpieces 1 are assembled into a strand after the surveying process. For this, no complex drives are required.
  • the roller pair 8 not only ensures that the workpieces 1 in the buffer area 3 are in one strand, but also ensures that the workpieces 1 as a function of the Kapproughen in the sawing station 2 to the lying between the saw station 2 and the buffer area 3 Transport device 9 are handed over that this in turn can perform the workpieces of the chop saw in the sawing station 2, that when passing the respective subsequent workpiece 1 to the chop saw, the gap to the leading workpiece 1 is minimized.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Control Of Conveyors (AREA)
  • Sawing (AREA)
  • Attitude Control For Articles On Conveyors (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Durchführung von Kappschnitten an Werkstücken aus Holz nach dem Oberbegriff des Anspruches 1 sowie ein Verfahren zur Durchführung von Kappschnitten an Werkstücken aus Holz nach dem Oberbegriff des Anspruches 8. Eine solche Vorrichtung und ein solches Verfahren sind aus dem Dokument WO2005113206A1 bekannt. Es sind Vorrichtungen bekannt, bei denen die Transporteinrichtung zum Zuführen der Werkstücke an den Vorschub der Kappsäge direkt gekoppelt ist. Solche Vorrichtungen haben nur einen geringen Durchsatz, weil die Werkstücke so lange nicht transportiert werden können, wie das jeweils vorausgehende Werkstück durch die Kappsäge bearbeitet wird.
Es sind weiter Vorrichtungen bekannt, bei denen die Transporteinrichtung einen eigenen Antrieb aufweist, der nach einem Signal der Kappsäge das nächste Werkstück zuführt. Auch bei solchen Vorrichtungen ist der Durchsatz verhältnismäßig gering.
Es sind schließlich Vorrichtungen bekannt, bei denen die Werkstücke mittels eines geregelten Antriebes der Sägestation so zugeführt werden, dass der Abstand aufeinanderfolgender Werkstücke bei der Übergabe an die Kappsäge gering ist.The invention relates to a device for performing cross cuts on wooden workpieces according to the preamble of claim 1 and to a method for performing cross cuts on wooden workpieces according to the preamble of claim 8. Such a device and such a method are known from the document WO2005113206A1 known. Devices are known in which the transport device for feeding the workpieces to the feed of the chop saw is directly coupled. Such devices have only a low throughput, because the workpieces can not be transported as long as the respective preceding workpiece is processed by the chop saw.
There are also known devices in which the transport device has its own drive, which supplies the next workpiece after a signal of the chop saw. Even with such devices, the throughput is relatively low.
Finally, devices are known in which the workpieces are fed by means of a controlled drive to the sawing station in such a way that the distance between successive workpieces when transferring them to the chopper saw is small.

Der Erfindung liegt die Aufgabe zugrunde, die gattungsgemäße Vorrichtung und das gattungsgemäße Verfahren so auszubilden, dass bei einfacher Ausbildung und hohem Durchsatz Kappschnitte zur Entfernung von Werkstückfehlern zuverlässig durchgeführt werden können.
Diese Aufgabe wird bei der gattungsgemäßen Vorrichtung erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruches 1 und beim gattungsgemäßen Verfahren erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruches 8 gelöst.
Bei der erfindungsgemäßen Vorrichtung werden die Werkstücke auf der Transporteinrichtung in Richtung auf die Sägestation transportiert. An dem der Sägestation zugewandten Ende der Transporteinrichtung befindet sich eine Rückhalte/Staueinheit. Sie sorgt dafür, dass die Werkstücke an ihr aufgehalten werden. Dies hat zur Folge, dass die Werkstücke in einem Strang hintereinander derart angeordnet sind, dass sie mit ihren Stirnseiten aneinander liegen. Die Transporteinrichtung mit der Rückhalte/Staueinheit bildet dadurch einen Pufferbereich, in dem die Werkstücke zunächst gepuffert werden. Die Rückhalte/Staueinheit wird unabhängig vom Transportelement der Transporteinrichtung angetrieben, wobei die von ihr ausgeübte Vorschubgeschwindigkeit auf die Werkstücke kleiner ist als die vom Transportelement der Transporteinrichtung erzeugte Vorschubgeschwindigkeit. Dadurch kann in sehr einfacher Weise der Werkstückstrang gebildet werden.The invention has for its object to form the generic device and the generic method so that with a simple design and high throughput Kappschnitte for the removal of workpiece errors can be performed reliably.
This object is achieved according to the invention in the generic device with the characterizing features of claim 1 and in the generic method according to the invention with the characterizing features of claim 8.
In the apparatus according to the invention, the workpieces are transported on the transport device in the direction of the sawing station. At the end of the transport device facing the sawing station there is a retention / storage unit. It ensures that the workpieces are held up to her. This has the consequence that the workpieces are arranged in a train one behind the other in such a way that they lie with their end faces together. The transport device with the retention / storage unit thereby forms a buffer area in which the workpieces are first buffered. The retaining / stowage unit is driven independently of the transport element of the transport device, whereby the feed rate exerted by it on the workpieces is smaller than the feed speed generated by the transport element of the transport device. As a result, the workpiece string can be formed in a very simple manner.

Zwischen der Rückhalte/Staueinheit und der Sägestation befindet sich erfindungsgemäß die Übergabetransporteinrichtung, mit der die Werkstücke der Sägestation zugeführt werden. Da der Antrieb des Transportelementes der Übergabetransporteinrichtung vom Antrieb der Rückhalte/Staueinheit entkoppelt ist, besteht die Möglichkeit, die Werkstücke beschleunigt weiterzutransportieren. Mit der Rückhalte/Staueinheit werden die Werkstücke zunächst nur mit geringer Geschwindigkeit dem Transportelement der Übergabetransporteinrichtung zugeführt. Sobald die Werkstücke von diesem Transportelement erfasst werden, werden sie beschleunigt weiter transportiert. Dies hat zur Folge, dass die Werkstücke voneinander getrennt werden, so dass sie nicht mehr mit ihren Stirnseiten aneinander liegen. Da die Antriebe der Übergabetransporteinrichtung und der Rückhalte/Staueinheit voneinander entkoppelt oder gekoppelt sind mit einer Übersetzung ins Schnelle, können die Antriebe so gesteuert bzw. geregelt werden, dass die Werkstücke mit minimalem Abstand zur Kappsäge in der Sägestation gelangen, obgleich die Werkstücke auf der Transporteinrichtung zunächst zu einem Strang aneinander liegend angeordnet waren. Auf diese Weise kann trotz einfacher Ausbildung der Vorrichtung ein hoher Durchsatz an Werkstücken erreicht werden.Between the retaining / stowage unit and the sawing station according to the invention is the transfer conveyor, with which the workpieces are fed to the sawing station. Since the drive of the transport element of the transfer conveyor is decoupled from the drive of the retention / accumulation unit, there is the possibility of further transporting the workpieces at an accelerated speed. With the retaining / stowage unit, the workpieces are initially fed at low speed to the transport element of the transfer conveyor. As soon as the workpieces are caught by this transport element they are transported on, accelerated. This has the consequence that the workpieces are separated from each other, so that they no longer lie with their front sides together. Since the drives of the transfer conveyor and the retaining / stowage unit are decoupled from each other or coupled with a translation at speed, the drives can be controlled so that the workpieces are at a minimum distance from the chop saw in the saw station, although the workpieces are on the transport means initially arranged in a strand to each other. In this way, despite a simple design of the device, a high throughput of workpieces can be achieved.

Vorteilhaft wird die Rückhalte/Staueinheit durch ein Rollenpaar gebildet. Die beiden Rollen bilden einen Rollenspalt, durch den die Werkstücke transportierbar sind. Wenigstens eine der beiden Rollen ist drehbar angetrieben, so dass die Werkstücke zuverlässig durch den Rollenspalt zur nachfolgenden Übergabetransporteinrichtung gefördert werden können.Advantageously, the retention / storage unit is formed by a pair of rollers. The two rollers form a roller nip through which the workpieces can be transported. At least one of the two rollers is rotatably driven, so that the workpieces can be reliably conveyed through the roller gap to the subsequent transfer conveyor.

Eine optimale Betriebsweise der Vorrichtung ergibt sich, wenn der Antrieb der Rückhalte/Staueinheit regelbar ist.An optimal operation of the device results when the drive of the retention / storage unit is adjustable.

Damit die Werkstücke zuverlässig durch den Rollenspalt transportiert werden können, liegen die Rollen unter Druck an den Werkstücken an.To ensure that the workpieces can be transported reliably through the roller gap, the rollers rest against the workpieces under pressure.

Die Übergabetransporteinrichtung weist bei einer vorteilhaften Ausbildung Druckrollen auf, die einem Transportelement der Übergabetransporteinrichtung gegenüberliegen und unter Druck auf den Werkstücken aufliegen.In an advantageous embodiment, the transfer transport device has pressure rollers which lie opposite a transport element of the transfer transport device and rest under pressure on the workpieces.

Damit ein zuverlässiger Transport der Werkstücke durch die Vorrichtung sichergestellt ist, entspricht die Länge des Transportelementes der Übergabetransporteinrichtung mindestens der maximalen Länge der Werkstücke.So that a reliable transport of the workpieces is ensured by the device, the length of the transport element of the transfer conveyor corresponds to at least the maximum length of the workpieces.

Um den Transport der Werkstücke zur Kappsäge der Sägestation zu optimieren, ist im Bereich der Übergabetransporteinrichtung in vorteilhafter Weise wenigstens ein Sensor vorgesehen, der vorzugsweise eine Fotozelle ist. Mit dem Sensor kann die Position der Werkstücke auf dem Transportelement der Übergabetransporteinrichtung erfasst werden. Insbesondere wenn das Transportelement über einen geregelten Antrieb angetrieben wird, kann auf diese Weise unter Berücksichtigung der jeweiligen Position des Werkstückes der Abstand aufeinanderfolgender Werkstücke innerhalb der Sägestation minimiert werden.In order to optimize the transport of the workpieces to the chop saw of the sawing station, is in the transfer conveyor in more advantageous Way provided at least one sensor, which is preferably a photocell. With the sensor, the position of the workpieces can be detected on the transport element of the transfer conveyor. In particular, when the transport element is driven by a controlled drive, in this way, taking into account the respective position of the workpiece, the distance between successive workpieces can be minimized within the sawing station.

Bei einer bevorzugten Ausbildung sind die Antriebe der Transportelemente der Transporteinrichtung und der Übergabetransporteinrichtung, der Rückhalte/Staueinheit und der Transporteinrichtung im Bereich der Kappsäge in der Sägestation an eine Steuerung angeschlossen. Sie kann dann in Abhängigkeit der vorhandenen Daten die einzelnen Antriebe so steuern oder bevorzugt auch regeln, dass ein optimaler Durchsatz der Werkstücke durch die Vorrichtung erreicht wird.In a preferred embodiment, the drives of the transport elements of the transport device and the transfer conveyor, the retaining / stowing unit and the transport device are connected to a control in the area of the chop saw in the sawing station. Depending on the available data, it can then control or preferably also regulate the individual drives so that an optimum throughput of the workpieces is achieved by the device.

Beim erfindungsgemäßen Verfahren werden die Werkstücke zunächst so aufgestaut, dass sie mit ihren Stirnseiten aneinander liegend einen durchgehenden Strang bilden. Die Werkstücke werden anschließend einzeln so beschleunigt weitertransportiert, dass sie wieder Abstand voneinander haben. Die Werkstücke können dann zuverlässig der Kappsäge in der Sägestation zugeführt werden. Im Bereich der Übergabetransporteinrichtung wird die Position der Werkstücke erfasst, die beim Zuführen der Werkstücke zur Sägestation berücksichtigt wird.In the method according to the invention, the workpieces are initially dammed so that they form a continuous strand with their front sides lying against each other. The workpieces are then transported individually accelerated so that they again have distance from each other. The workpieces can then be reliably fed to the chop saw in the sawing station. In the area of the transfer conveyor, the position of the workpieces is recorded, which is taken into account when feeding the workpieces to the sawing station.

Ein guter Durchsatz der Werkstücke wird erreicht, wenn die Beschleunigung der Werkstücke in Abhängigkeit vom Transport der Werkstücke in der Sägestation im Bereich der Kappsäge durchgeführt wird. Dann kann das jeweils nachfolgende Werkstück so zugeführt werden, dass der Abstand zum vorausgehenden Werkstück minimal ist. Hierbei ist der Abstand vorteilhaft nur so gering, dass aufeinanderfolgende Werkstücke im Übergabebereich an die Kappsäge innerhalb der Sägestation einander gerade nicht berühren.A good throughput of the workpieces is achieved when the acceleration of the workpieces is carried out depending on the transport of the workpieces in the sawing station in the field of chop saw. Then, the respective subsequent workpiece can be fed so that the distance to the preceding workpiece is minimal. In this case, the distance is advantageously only so small that successive workpieces in the transfer area to the chop saw within the saw station just do not touch each other.

Um einen hohen Durchsatz zu erreichen, ist es von Vorteil, wenn die Zuführgeschwindigkeit des jeweils nachfolgenden Werkstückes in die Sägestation geregelt wird. Mit der Regelung ist es möglich, in Abhängigkeit von der Bearbeitungszeit des jeweils vorausgehenden Werkstückes in der Sägestation die Zuführgeschwindigkeit des nachfolgenden Werkstückes optimal einzustellen.In order to achieve a high throughput, it is advantageous if the feed rate of the respective subsequent workpiece is controlled in the sawing station. With the control, it is possible, depending on the processing time of the respective preceding workpiece in the sawing station optimally adjust the feed rate of the subsequent workpiece.

Bevorzugt wird die Zuführgeschwindigkeit des jeweils nachfolgenden Werkstückes in der Übergabetransporteinrichtung variabel geregelt, wodurch der Durchsatz der Werkstücke weiter optimiert werden kann.Preferably, the feed rate of the respective subsequent workpiece in the transfer conveyor is variably controlled, whereby the throughput of the workpieces can be further optimized.

Bevorzugt wird die Zuführgeschwindigkeit des jeweils nachfolgenden Werkstückes in der Übergabetransporteinrichtung laufend in einer Steuerung neu errechnet. Somit kann der Abstand zwischen aufeinanderfolgenden Werkstücken stets klein bzw. minimal gehalten werden.Preferably, the feed rate of the respective subsequent workpiece in the transfer conveyor is continuously recalculated in a controller. Thus, the distance between successive workpieces can always be kept small or minimal.

Von Vorteil ist es, wenn die Steuerung mit einer fließenden Positionsverfolgung der Werkstücke arbeitet. Dadurch können die verschiedenen Antriebe für die jeweiligen Transportelemente optimal aufeinander abgestimmt werden.It is advantageous if the controller works with a flowing position tracking of the workpieces. This allows the various drives for the respective transport elements are optimally matched.

Die vermessenen Werte der Werkstücke werden vorteilhaft gespeichert.The measured values of the workpieces are advantageously stored.

Die erfassten und die abgespeicherten Werte können dann zur Regelung der Zuführgeschwindigkeit der Werkstücke herangezogen werden.The detected and stored values can then be used to control the feed rate of the workpieces.

Bei einer Ausführungsform werden die jeweils nachfolgenden Werkstücke ohne Unterbrechung der Zuführgeschwindigkeit in der Übergabetransporteinrichtung der Sägestation zugeführt.In one embodiment, the respective subsequent workpieces are fed to the sawing station without interruption of the feed rate in the transfer conveyor.

Vorteilhaft ist der Antrieb zum Transport der nachfolgenden Werkstücke mittels der Übergabetransporteinrichtung vom Antrieb der Werkstücke in der Sägestation entkoppelt. Dadurch kann der Transport der Werkstücke innerhalb der Sägestation im Stop-and-go-Verfahren erfolgen, während die Zuführung der Werkstücke zur Sägestation kontinuierlich, gegebenenfalls auch mit variabler Geschwindigkeit erfolgt.The drive for transporting the following workpieces is advantageously decoupled by means of the transfer conveyor from the drive of the workpieces in the sawing station. This allows the transport of the workpieces within the sawing station in the stop-and-go process, while the supply of workpieces to the sawing station continuously, optionally also with variable speed.

Der Anmeldungsgegenstand ergibt sich nicht nur aus dem Gegenstand der einzelnen Patentansprüche, sondern auch durch alle in den Zeichnungen und der Beschreibung offenbarten Angaben und Merkmale. Sie werden, auch wenn sie nicht Gegenstand der Ansprüche sind, als erfindungswesentlich beansprucht, soweit sie einzeln oder in Kombination gegenüber dem Stand der Technik neu sind.The subject of the application results not only from the subject matter of the individual claims, but also by all the information and features disclosed in the drawings and the description. They are, even if they are not the subject of the claims, claimed as essential to the invention, as far as they are new individually or in combination over the prior art.

Weitere Merkmale der Erfindung ergeben sich aus den weiteren Ansprüchen, der Beschreibung und der Zeichnung.Further features of the invention will become apparent from the other claims, the description and the drawings.

Die Erfindung wird anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Es zeigen

Fig. 1
in schematischer Darstellung und in Seitenansicht eine erfindungsgemäße Vorrichtung zum Kappsägen von Werkstücken,
Fig. 2
eine Draufsicht auf die Vorrichtung gemäß Fig. 1.
der Erfindung werden Werkstücke 1 in Form von länglichen Hölzern einer Sägestation 2 zugeführt, in der in den Werkstücken 1 befindliche Fehler mittels einer (nicht dargestellten) Kappsäge herausgeschnitten werden. Die Länge der Werkstücke 1 ist kleiner als etwa 1200 mm.The invention will be explained in more detail with reference to an embodiment shown in the drawing. Show it
Fig. 1
in a schematic representation and in side view of an inventive apparatus for cross-cutting of workpieces,
Fig. 2
a plan view of the device according to Fig. 1 ,
According to the invention, workpieces 1 in the form of elongated woods are fed to a sawing station 2 in which defects located in the workpieces 1 are cut out by means of a chop saw (not shown). The length of the workpieces 1 is less than about 1200 mm.

Der Sägestation 2 vorgeschaltet ist ein Pufferbereich 3, in dem die Werkstücke 1 so aufgestaut werden, dass sie mit ihren Stirnseiten 4 aneinander liegen. Der Pufferbereich 3 hat wenigstens eine Transporteinrichtung 5, mit der die Werkstücke 1 in Transportrichtung 6 in Richtung auf die Sägestation 2 transportiert werden. Die Transporteinrichtung 5 hat ein Transportelement 7, das ein endlos umlaufendes Transportband oder eine endlos umlaufende Kette sein kann, die in Transportrichtung 6 angetrieben wird. Als Transportelement kann auch eine Rollenbahn vorgesehen sein, deren angetriebene Rollen die Werkstücke 1 in Transportrichtung 6 transportieren.The sawing station 2 is preceded by a buffer area 3, in which the workpieces 1 are dammed so that they lie with their end faces 4 together. The buffer area 3 has at least one transport device 5, with which the workpieces 1 are transported in the transport direction 6 in the direction of the sawing station 2. The transport device 5 has a transport element 7, which is an endlessly circulating conveyor belt or an endlessly circulating conveyor belt Chain can be, which is driven in the transport direction 6. As a transport element may also be provided a roller conveyor whose driven rollers transport the workpieces 1 in the transport direction 6.

Der Pufferbereich 3 bzw. die Transporteinrichtung 5 hat am in Transportrichtung 6 vorderen Ende ein Rollenpaar 8, das um horizontale Achsen drehbare Rollen aufweist, die sich im Bereich oberhalb und unterhalb des Transportweges der Werkstücke 1 in Richtung auf die Sägestation 2 befinden. Das Rollenpaar 8 wird unabhängig vom Transportelement 7 angetrieben. Damit ein zuverlässiger Transport der Werkstücke 1 erreicht wird, liegen die Rollen 8 unter Druck an der Ober- und an der Unterseite der jeweiligen Werkstücke 1 an. Zum Druckaufbau ist es möglich, die Rollen 8 hydraulisch oder pneumatisch oder auch mittels Federkraft gegen das Werkstück 1 zu belasten. Der Druck, unter dem die Rollen 8 am Werkstück 1 anliegen, wird so eingestellt, dass ein Schlupf der Werkstücke 1 zwischen den Rollen 8 vermieden wird. Um die Werkstücke 1 im Rollenspalt zu transportieren, können beide Rollen 8, aber auch nur eine der beiden Rollen um die horizontale Achse drehbar angetrieben sein. Insbesondere wenn die Rollen 8 hydraulisch oder pneumatisch druckbelastet werden, können die entsprechenden Hydraulik- bzw. Pneumatikzylinder so gesteuert werden, dass der Anpressdruck der Rollen 8 an der Ober- und der Unterseite der Werkstücke 1 ausreichend hoch ist, um einen Schlupf des Werkstückes 1 zwischen den Rollen zu verhindern. Hierbei ist es möglich, durch geeignete Sensoren den Anpressdruck der Rollen am Werkstück 1 zu überwachen. Sollten die Sensoren einen Schlupf zwischen den Werkstücken 1 und den Rollen 8 erkennen, erzeugen die Sensoren ein entsprechendes Signal, mit dem die Hydraulik- bzw. Pneumatikzylinder so angesteuert werden, dass der Anpressdruck erhöht wird, bis der Schlupf verschwunden ist.The buffer region 3 or the transport device 5 has at the front end in the transport direction 6 a pair of rollers 8 which has rollers rotatable about horizontal axes which are located in the region above and below the transport path of the workpieces 1 in the direction of the sawing station 2. The pair of rollers 8 is driven independently of the transport element 7. For a reliable transport of the workpieces 1 is achieved, the rollers 8 are under pressure at the top and at the bottom of the respective workpieces 1 at. To build up pressure, it is possible to load the rollers 8 hydraulically or pneumatically or by spring force against the workpiece 1. The pressure under which the rollers 8 abut the workpiece 1 is adjusted so that slippage of the workpieces 1 between the rollers 8 is avoided. To transport the workpieces 1 in the roller gap, both rollers 8, but also only one of the two rollers can be rotatably driven about the horizontal axis. In particular, when the rollers 8 are hydraulically or pneumatically pressure-loaded, the corresponding hydraulic or pneumatic cylinders can be controlled so that the contact pressure of the rollers 8 at the top and bottom of the workpieces 1 is sufficiently high to a slip of the workpiece 1 between to prevent the roles. In this case, it is possible to monitor the contact pressure of the rollers on the workpiece 1 by means of suitable sensors. If the sensors detect a slip between the workpieces 1 and the rollers 8, the sensors generate a corresponding signal, with which the hydraulic or pneumatic cylinders are controlled so that the contact pressure is increased until the slip has disappeared.

Im Betrieb werden die Rollen 8 so drehbar angetrieben, dass die von ihnen erfassten Werkstücke 1 eine geringere Geschwindigkeit haben als die auf dem Transportelement 7 der Transporteinrichtung 5 geförderten nachfolgenden Werkstücke 1. Auf diese Weise stauen sich die Werkstücke 1 derart auf der Transporteinrichtung 5, dass sie mit ihren Stirnseiten 4 aneinander liegen, wie dies in den Fig. 1 und 2 dargestellt ist.In operation, the rollers 8 are rotatably driven so that the workpieces 1 detected by them have a lower speed than the conveyed on the transport element 7 of the conveyor 5 subsequent workpieces 1. In this way, the workpieces 1 jam like this on the transport device 5 that they lie with their end faces 4 together, as in the Fig. 1 and 2 is shown.

Die Rollen 8 werden vorteilhaft mittels eines geregelten Antriebes drehbar angetrieben, der ein Servoantrieb, ein FU-Antrieb oder ein Hydraulikantrieb sein kann. Der geregelte Antrieb erlaubt eine optimale Einstellung der Transportgeschwindigkeit der Werkstücke 1. Die Regelung erfolgt sowohl im Hinblick auf die Geschwindigkeit des Transportelementes 7 als auch im Hinblick auf die Transportgeschwindigkeit einer dem Rollenpaar nachgeschalteten Transporteinrichtung 9, die eine Übergabetransporteinrichtung bildet, mit der die Werkstücke 1 der Sägestation 2 übergeben werden. Die Transporteinrichtung 9 hat ein Transportelement 10, das vorteilhaft ein endlos umlaufendes Transportband ist. Anstelle des Transportbandes kann auch wenigstens eine endlos umlaufende Kette oder eine Rollenbahn vorgesehen sein. Das Transportelement 10 wird so angetrieben, dass die auf ihr aufliegenden Werkstücke 1 der nachfolgenden Sägestation 2 zugeführt werden. Um einen sicheren Transport der Werkstücke 1 mittels des Transportelementes 10 zu gewährleisten, befinden sich mit Abstand oberhalb des Transportelementes 10 Druckrollen 11, die unter Druck auf den Werkstücken 1 bei ihrem Transport mittels der Transporteinrichtung 9 aufliegen. Zur Anpassung an unterschiedliche Werkstückdicken sind die Druckrollen 11 senkrecht zum Transportelement 10 verstellbar. Die Druckrollen 11 verhindern ein Verrutschen der Werkstücke 1 auf dem Transportelement 10.The rollers 8 are advantageously rotatably driven by means of a controlled drive, which may be a servo drive, a drive FU or a hydraulic drive. The controlled drive allows an optimal adjustment of the transport speed of the workpieces 1. The control is carried out both in terms of the speed of the transport element 7 and with respect to the transport speed of the roller pair downstream transport device 9, which forms a transfer transport, with which the workpieces 1 of Saw station 2 are passed. The transport device 9 has a transport element 10, which is advantageously an endlessly circulating conveyor belt. Instead of the conveyor belt can also be provided at least one endless circulating chain or a roller conveyor. The transport element 10 is driven so that the resting on her workpieces 1 of the following sawing station 2 are supplied. In order to ensure a safe transport of the workpieces 1 by means of the transport element 10, located at a distance above the transport element 10 pressure rollers 11 which rest under pressure on the workpieces 1 during their transport by means of the transport device 9. To adapt to different workpiece thicknesses, the pressure rollers 11 are perpendicular to the transport element 10 adjustable. The pressure rollers 11 prevent slipping of the workpieces 1 on the transport element 10.

Der Antrieb für das Transportelement 10 erfolgt unabhängig vom Antrieb des Rollenpaares 8 sowie des Transportelementes 7 der Transporteinrichtung 5.The drive for the transport element 10 takes place independently of the drive of the roller pair 8 and of the transport element 7 of the transport device 5.

Der Antrieb des Transportelementes 10 kann auch mittels eines geregelten Antriebes erfolgen.The drive of the transport element 10 can also be done by means of a controlled drive.

Das Transportelement 10 hat eine Länge, die mindestens der maximalen Länge der Werkstücke 1 entspricht. Dadurch ist sichergestellt, dass auch das längste Werkstück 1 vollständig auf dem Transportelement 10 aufliegt und nicht mehr in den Spalt zwischen dem Rollenpaar 8 ragt. Die Druckrollen 11 sind mit Abstand in Transportrichtung 6 der Werkstücke 1 hintereinander angeordnet. Dabei ist der Abstand aufeinander folgender Druckrollen 11 so klein, dass auch sehr kurze Werkstücke 1 von den Druckrollen 11 erfasst werden können.The transport element 10 has a length which corresponds at least to the maximum length of the workpieces 1. This ensures that too the longest workpiece 1 rests completely on the transport element 10 and no longer protrudes into the gap between the pair of rollers 8. The pressure rollers 11 are arranged at a distance in the transport direction 6 of the workpieces 1 one behind the other. The distance between successive pressure rollers 11 is so small that even very short workpieces 1 can be detected by the pressure rollers 11.

Beim Betrieb der Vorrichtung wird das Transportelement 10 so angetrieben, dass die mit ihm transportierten Werkstücke 1 eine höhere Geschwindigkeit haben als im Bereich zwischen dem Rollenpaar 8. Dadurch wird erreicht, dass die im Pufferbereich 3 mit ihren Stirnseiten 4 aneinander liegenden Werkstücke 1 vor ihrem Eintritt in die Sägestation 2 nicht mehr mit ihren Stirnseiten aneinander liegen, sondern in Transportrichtung 6 Abstand voneinander haben. In den Fig. 1 und 2 ist dies beispielhaft für zwei hintereinander liegende Werkstücke 1', 1" im Bereich der Transporteinrichtung 9 dargestellt. Das linke Werkstück 1' liegt noch mit seinem in Transportrichtung rückwärtigen Ende auf dem Transportelement 10 auf, wobei dieses Werkstückende durch die letzte Druckrolle 11 in Richtung auf das Transportelement 10 druckbelastet ist. Gleichzeitig liegt das in Transportrichtung vordere Ende dieses Werkstückes 1' auf einem Transportelement 12 auf, gegen das dieses Werkstückende mittels einer Druckrolle 13 gedrückt wird. Das Transportelement 12 und die Druckrolle 13 sind bereits Bestandteil einer Transporteinrichtung der Sägestation 2, mit der die Werkstücke 1 der Kappsäge zugeführt werden.During operation of the device, the transport element 10 is driven so that the transported with him workpieces 1 have a higher speed than in the area between the pair of rollers 8. This ensures that the lying in the buffer area 3 with their end faces 4 workpieces 1 before their entry in the sawing station 2 no longer lie with their end faces together, but in the transport direction 6 distance from each other. In the Fig. 1 and 2 this is shown by way of example for two workpieces 1 ', 1 "lying one behind the other in the area of the transporting device 9. The left-hand workpiece 1' still rests on the transport element 10 with its rear end in the direction of transport, this workpiece end being moved in the direction of the last pressure roller 11 At the same time, the front end of this workpiece 1 'in the transport direction rests on a transport element 12 against which this workpiece end is pressed by means of a pressure roller 13. The transport element 12 and the pressure roller 13 are already part of a transport device of the saw station 2, with the workpieces 1 of the chop saw are supplied.

Am in Transportrichtung 6 rückwärtigen Ende liegt außerdem auf dem Transportelement 10 das Werkstück 1" auf, das von den entsprechenden Druckrollen 11 gegen das Transportelement 10 druckbelastet wird. Die beiden Werkstücke 1', 1" auf dem Transportelement 10 haben einen Abstand voneinander, der dadurch erreicht wird, dass die Transportgeschwindigkeit des Transportelementes 10 höher ist als die Transportgeschwindigkeit des Rollenpaares 8. Die im Pufferbereich 3 noch aneinander liegenden Werkstücke 1 werden somit auf Lücke auseinander gezogen, bevor die Werkstücke 1 mit der Transporteinrichtung 9 in die Sägestation 2 transportiert werden.In addition, at the rear end in the direction of transport 6 the workpiece 1 "is located on the transport element 10, which is pressure-loaded by the corresponding pressure rollers 11 against the transport element 10. The two workpieces 1 ', 1" on the transport element 10 are separated from each other is reached, that the transport speed of the transport element 10 is higher than the transport speed of the roller pair 8. The still lying in the buffer area 3 workpieces 1 are thus pulled apart on the gap before the workpieces 1 are transported with the transport device 9 in the sawing station 2.

Die in der Sägestation 2 vorhandene Kappsäge führt an den Werkstücken 1 die erforderlichen Kappschnitte durch, um schlechte Holzqualitäten und/oder Holzfehler aus dem Werkstück 1 zu entfernen. Erfindungsgemäss werden die aus dem Werkstück 1 herauszuschneidenden schlechten Holzqualitäten und/oder Holzfehler in einer dem Pufferbereich 3 vorgeschalteten (nicht dargestellten) Station erfasst. Dies kann mittels Scanner oder in einer Kreidemessstation durchgeführt werden. In dieser vorgeschalteten Station werden die Werkstücke 1 auch in ihrer Länge vermessen. Die Längenmaße sowie die Stellen, an denen die Kappsägeschnitte am Werkstück 1 durchgeführt werden sollen, werden in einer Steuerung gespeichert. Die so erstellte Schnittliste wird der Sägestation 2 übermittelt, deren Kappsäge entsprechend dieser Schnittliste an den erforderlichen Stellen der Werkstücke 1 die notwendigen Kappschnitte durchführt. Außerdem wird die Schnittliste einer übergeordneten Steuerung zugeführt, mit der die Antriebe der Transporteinrichtungen 5 und 9 sowie des Rollenpaares 8 gesteuert werden.The chop saw present in the sawing station 2 performs the required chop-cuts on the workpieces 1 in order to remove bad wood qualities and / or wood defects from the workpiece 1. According to the invention, the bad wood qualities and / or wood defects to be cut out of the workpiece 1 are detected in a station upstream of the buffer area 3 (not shown). This can be done by means of a scanner or in a chalking station. In this upstream station, the workpieces 1 are also measured in their length. The length dimensions and the places where the Kappsägeschnitte to be performed on the workpiece 1 are stored in a controller. The cut list produced in this way is transmitted to the sawing station 2, whose chop saw performs the necessary chop cuts at the required points of the workpieces 1 in accordance with this cut list. In addition, the cut list is supplied to a higher-level control, with which the drives of the transport devices 5 and 9 and of the roller pair 8 are controlled.

Die Werkstücke 1 weisen eine unterschiedliche Zahl an Holzfehlern auf. Dies führt dazu, dass in der Sägestation 2 eine unterschiedliche Zahl an Kappschnitten an den Werkstücken 1 vorgenommen werden muss. Dies wiederum bedeutet, dass die Werkstücke 1 sich unterschiedlich lang in der Sägestation 2 befinden, bevor sie die Sägestation verlassen. Dementsprechend müssen die Transportgeschwindigkeiten der jeweils nachfolgenden Werkstücke 1 so eingerichtet werden, dass das nachfolgende Werkstück 1 nicht bereits dann in den Bereich der Kappsäge gelangt, während dort das vorausgehende Werkstück noch bearbeitet wird. Andererseits soll der Abstand zwischen den aufeinander folgenden Werkstücken innerhalb der Sägestation 2 möglichst klein sein, um einen maximalen Durchsatz an Werkstücken in der Sägestation 2 zu erreichen.The workpieces 1 have a different number of wood defects. This results in that a different number of Kappschnitten must be made on the workpieces 1 in the sawing station 2. This in turn means that the workpieces 1 are of different lengths in the sawing station 2 before they leave the sawing station. Accordingly, the transport speeds of the respective subsequent workpieces 1 must be set so that the subsequent workpiece 1 does not already then enters the area of the chop saw, while there the preceding workpiece is still processed. On the other hand, the distance between the successive workpieces within the sawing station 2 should be as small as possible in order to achieve a maximum throughput of workpieces in the sawing station 2.

Um dieses Ziel vorteilhaft zu unterstützen, wird in der Sägestation 2 mittels eines (nicht dargestellten) Sensors das in Transportrichtung rückwärtige Ende des in der Sägestation 2 befindlichen Werkstückes 1 überwacht. Damit ist die Position dieses Brettendes in der Sägestation 2 bekannt.In order to assist this goal, the rear end of the workpiece 1 located in the sawing station 2 is monitored in the sawing station 2 by means of a sensor (not shown). Thus, the position of this board end in the sawing station 2 is known.

In der Transporteinrichtung 9 befindet sich wenigstens ein weiterer (nicht dargestellter) Sensor, mit dem die Position des in der Transporteinrichtung 9 befindlichen Werkstückes 1 erfasst wird. Da außerdem die Länge des jeweiligen Werkstückes 1 zuvor schon ermittelt worden ist, kann die übergeordnete Steuerung das Rollenpaar 8 so antreiben, dass bei der Übergabe des nachfolgenden Werkstückes 1 an die Kappsäge in der Sägestation 2 der Abstand zum vorausgehenden Werkstück 1 minimiert ist. Dieser Abstand vor der Kappsäge ist so gering, dass sich die hintereinander folgenden Werkstücke 1 gerade nicht berühren.In the transport device 9 there is at least one further sensor (not shown) with which the position of the workpiece 1 located in the transport device 9 is detected. In addition, since the length of the respective workpiece 1 has already been determined beforehand, the higher-level control can drive the pair of rollers 8 such that the distance to the preceding workpiece 1 is minimized during the transfer of the following workpiece 1 to the chop saw in the sawing station 2. This distance in front of the chop saw is so small that the successive workpieces 1 just do not touch.

Beim Einsatz der Vorrichtung werden die Werkstücke 1 zunächst in der dem Pufferbereich 3 vorgeschalteten Station hinsichtlich ihrer Länge vermessen. Außerdem werden in diesem Bereich schlechte Holzqualitäten und/oder Holzfehler an den Werkstücken markiert, so dass die Kappsäge in der Sägestation 2 an den erforderlichen Stellen die Kappschnitte durchführt. Die so vermessenen und markierten Werkstücke 1 gelangen auf das Transportelement 7 des Pufferbereiches 3 und werden mit ihm in Richtung auf das Rollenpaar 8 transportiert. Die Transportgeschwindigkeit der Transporteinrichtung 5 im Pufferbereich 3 ist größer als die vom Rollenpaar 8 erzeugte Transportgeschwindigkeit, so dass die Werkstücke 1 am Rollenpaar 8, d. h. am Ende des Pufferbereiches 3, aufeinander auflaufen und mit ihren Stirnseiten 4 aneinander liegen.When using the device, the workpieces 1 are first measured in terms of their length in the buffer region 3 upstream station. In addition, bad wood qualities and / or wood defects are marked on the workpieces in this area, so that the chop saw in the sawing station 2 performs the Kappschnitte at the required locations. The thus measured and marked workpieces 1 reach the transport element 7 of the buffer area 3 and are transported with it in the direction of the pair of rollers 8. The transport speed of the transport device 5 in the buffer area 3 is greater than the transport speed generated by the pair of rollers 8, so that the workpieces 1 on the roller pair 8, d. H. at the end of the buffer area 3, accumulate on each other and lie with their end faces 4 together.

Die Werkstücke 1 werden durch das Rollenpaar 8 der nachgeschalteten Transporteinrichtung 9 zugeführt, die sich zwischen der Sägestation 2 und dem Rollenpaar 8 und damit dem Pufferbereich 3 befindet. Das Transportelement 10 der Transporteinrichtung 9 wird so angetrieben, dass die Transportgeschwindigkeit höher ist als die Transportgeschwindigkeit, die durch das Rollenpaar 8 erzeugt wird. Dadurch lösen sich die hintereinander liegenden Werkstücke 1 voneinander.The workpieces 1 are fed by the roller pair 8 of the downstream transport device 9, which is located between the sawing station 2 and the pair of rollers 8 and thus the buffer area 3. The transport element 10 of the transport device 9 is driven so that the transport speed is higher than the transport speed through the pair of rollers 8 is generated. As a result, the successively lying workpieces 1 detached from each other.

Von der Transporteinrichtung 9 gelangen die Werkstücke 1 in die Sägestation 2, in der die Werkstücke über eine (nur schematisch dargestellt) Transporteinrichtung 12, 13 der Kappsäge zugeführt werden. Sie nimmt an den Werkstücken 1 die zuvor gekennzeichneten Schnitte vor. Während des Sägeschnittes steht das Werkstück 1 still. Bei mehreren vorzunehmenden Schnitten wird somit das Werkstück schrittweise transportiert.From the transport device 9 get the workpieces 1 in the sawing station 2, in which the workpieces via a (only schematically shown) transport means 12, 13 of the chop saw are supplied. It takes on the workpieces 1, the previously marked sections. During the saw cut the workpiece 1 stands still. With several cuts to be made thus the workpiece is transported stepwise.

Durch den Sensor im Bereich der Transporteinrichtung 9 ist die Position des jeweils nachfolgenden Werkstückes 1 bekannt. Die Positionswerte werden zusammen mit den Längenmaßen der Werkstücke sowie die Geschwindigkeit der Transporteinrichtung 9 und des Rollenpaares 8 der Steuerung zugeführt. Aus diesen Werten errechnet die Steuerung die erforderliche Zuführgeschwindigkeit des jeweils nachfolgenden Werkstückes 1 und regelt dementsprechend die Antriebe des Rollenpaares 8 sowie der Transporteinrichtung 9. Die Zuführgeschwindigkeit des jeweils nachfolgenden Werkstückes 1 wird laufend neu in der Steuerung errechnet. Auf diese Weise werden die Werkstücke 1 von der Transporteinrichtung 9 der Sägestation 2 stets so zugeführt, dass das nachfolgende Werkstück 1 nur einen minimalen Abstand von dem vorausgehenden Werkstück 1 aufweist, das mittels der Kappsäge noch bearbeitet wird. Unter minimalem Abstand ist zu verstehen, dass die aufeinander folgenden Werkstücke 1 bei der Übergabe an die Kappsäge nur einen solchen Abstand voneinander haben, dass sie sich gerade nicht berühren. Dadurch ist bei der Übergabe der Werkstücke an die Kappsäge die Lücke zwischen den aufeinander folgenden, mit der Kappsäge zu bearbeitenden Werkstücken minimiert. Vorteilhaft erfolgt die Steuerung oder Regelung derart, dass die Werkstücke 1 ohne Stillstand der Sägestation 2 zugeführt werden. Die Zuführgeschwindigkeit der Transporteinrichtung 9 wird vorteilhaft variabel geregelt, wobei die Zuführgeschwindigkeit laufend neu in der Steuerung berechnet wird.By the sensor in the region of the transport device 9, the position of the respective subsequent workpiece 1 is known. The position values are fed together with the lengths of the workpieces and the speed of the conveyor 9 and the roller pair 8 of the controller. From these values, the controller calculates the required feed rate of the respective subsequent workpiece 1 and accordingly controls the drives of the roller pair 8 and the transport device 9. The feed rate of each subsequent workpiece 1 is continuously recalculated in the controller. In this way, the workpieces 1 are always supplied by the transport device 9 of the sawing station 2 so that the subsequent workpiece 1 has only a minimum distance from the preceding workpiece 1, which is still processed by means of the chop saw. At a minimum distance is to be understood that the successive workpieces 1 in the transfer to the chop saw only have such a distance from each other that they just do not touch. As a result, the gap between the successive, to be machined with the chop saw workpieces is minimized in the transfer of the workpieces to the chop saw. Advantageously, the control or regulation takes place in such a way that the workpieces 1 are fed to the sawing station 2 without stopping. The feed speed of the transport device 9 is advantageously regulated variably, wherein the feed rate is continuously recalculated in the controller.

Je nach Bearbeitungszeit der Werkstücke 1 in der Sägestation 2 kann der Transport der jeweils nachfolgenden Werkstücke 1 auch unterbrochen bzw. angehalten werden.Depending on the processing time of the workpieces 1 in the sawing station 2, the transport of the respective subsequent workpieces 1 can also be interrupted or stopped.

Da die Werkstücke 1 zunächst im Pufferbereich 3 so gepuffert werden, dass sie mit ihren Stirnseiten 4 aneinander liegen, ist eine einfache Zuführung der Werkstücke nach dem Vermessen möglich. Das Rollenpaar 8 sorgt dafür, dass die Werkstücke 1 nach dem Vermessungsvorgang zu einem Strang zusammengefügt werden. Hierfür sind keine aufwändigen Antriebe erforderlich. Das Rollenpaar 8 sorgt nicht nur dafür, dass die Werkstücke 1 im Pufferbereich 3 in einem Strang liegen, sondern sorgt auch dafür, dass die Werkstücke 1 in Abhängigkeit von den Kappschnitten in der Sägestation 2 so an die zwischen der Sägestation 2 und dem Pufferbereich 3 liegende Transporteinrichtung 9 übergeben werden, dass diese ihrerseits die Werkstücke derart der Kappsäge in der Sägestation 2 zuführen kann, dass bei der Übergabe des jeweils nachfolgenden Werkstückes 1 an die Kappsäge die Lücke zum vorauslaufenden Werkstück 1 minimiert ist.Since the workpieces 1 are first buffered in the buffer area 3 in such a way that they lie against one another with their end faces 4, a simple supply of the workpieces after the measurement is possible. The pair of rollers 8 ensures that the workpieces 1 are assembled into a strand after the surveying process. For this, no complex drives are required. The roller pair 8 not only ensures that the workpieces 1 in the buffer area 3 are in one strand, but also ensures that the workpieces 1 as a function of the Kappschnitten in the sawing station 2 to the lying between the saw station 2 and the buffer area 3 Transport device 9 are handed over that this in turn can perform the workpieces of the chop saw in the sawing station 2, that when passing the respective subsequent workpiece 1 to the chop saw, the gap to the leading workpiece 1 is minimized.

Claims (13)

  1. A device for making chop cuts in longitudinal workpieces (1) made of wood, with at least one sawing station (2) which features at least one chop saw and which is arranged downstream of at least one transport device (5), by means of which the workpieces are supplied to the sawing station (2) wherein at least one transport unit (12, 13), to which the workpieces (1) are transferred, is located in said sawing station and features a drive separate from the transport device (5),
    characterised in that the transport device (5) and the transport unit (12, 13) of the sawing station (2) are, in the longitudinal direction of the longitudinal workpieces (1), arranged one behind the other in such a way that the workpieces (1) are transported in their longitudinal direction, in that the transport device (5) at its end facing the sawing station (2) and its transport unit (12, 13) is provided with a retaining/accumulating unit (8) which can be driven independently of the transport element (7) of the transport device (5) and exerts a smaller supply speed on the workpieces (1) than the transport element (7), so that the workpieces (1) at the front end of the transport element (7) of the transport device (5) in the direction of transporting are accumulated in such a way that following workpieces (1) with their end faces in contact with each other form a line, that between the retaining/accumulating unit (8) and the sawing station (2) at least one transfer transport element (9) is provided, which comprises at least one transport element (10), the drive of which, independently or mechanically coupled with a transmission into fast, is controlled/adjusted by the drive of the retaining/accumulating unit (8) and which transfers the workpieces (1) in their longitudinal direction from the retaining/accumulating unit (8) to the transport unit (12, 13) of the sawing station (2), and in that the drives of the transport element (7) of the transport device (5), of the transport element (10) of the transfer transport device (9), of the retaining/ accumulating unit (8) and of the chap saw are connected to a control unit which controls/regulates the chop saw as well as the drives as a function of a stored cutting list which contains the length dimensions and the poor wood qualities and/or wood defects of the workpieces (1).
  2. The device according to claim 1,
    characterised in that the retaining/accumulating unit (8), the drive of which can advantageously be regulated, is a pair of rollers, of which at least one roller can be driven, and which has a roller gap through which the workpieces (1) can be driven.
  3. The device according to claim 2,
    characterised in that the rollers (8) contact the workpieces (1) being transported through the roller gap under pressure.
  4. The device according to any one of claims 1 to 3,
    characterised in that the transfer transport device (9) has pressure rollers (11) which are opposite the transport element (10) of the transfer transport device (9) and are contact the workpieces (1) under pressure.
  5. The device according to any one of claims 1 to 4,
    characterised in that the length of the transport element (10) of the transfer transport device (9) at least corresponds at least to the maximum length of the workpieces (1).
  6. The device according to any one of claims 1 to 5,
    characterised in that in the area of the transfer transport device (9) at least one sensor, preferably a photo cell, is provided that records the position of the workpieces (1) on the transport element (10).
  7. A method of producing chop cuts in longitudinal workpieces (1) made of wood, in particular with a device according to any one of claims 1 to 6, in which the length of the workpieces (1) as well as defects in the workpieces (1) are recorded in a cut list, which is supplied to a control unit, and the workpieces (1) are then transported into the sawing station (2) in such a way that the gap between successive workpieces (1) is minimised on transfer to the chop saw,
    characterised in that on their way from a transport device (5) to transfer at a transport unit (12, 13) in the saw station (2) the workpieces (1) are transported in their longitudinal direction, in that at the front end in the direction of transporting the workpieces (1) are accumulated by means of a retaining/accumulating unit (8) in such a way, that the working pieces (1) lie with their face ends (4) abutting each other forming a line, that the workpieces (1) behind the retaining/accumulating unit (8) are taken over by a transfer transport device (9) which accelerates the abutting workpieces (1) in such a way that they are again spaced apart from one another and transfers them to the transport unit (12, 13) of the saw station (2), and in that the drives of the transport device (5), of the retaining/accumulating unit (8), of the transfer transport device (9) and of the transport unit (12, 13) in the sawing station (2) are controlled/regulated by the control unit as a function of the cut list, wherein the drive of the transfer transport device (9) is decoupled from the drive of the transport device (12, 13) in the sawing station (2).
  8. The method according to claim 7,
    characterised in that the acceleration of the workpieces (1) is carried out as a function of the transport of the workpieces (1) in the sawing station (2) in the area of the chop saw.
  9. The method according to claim 7 or 8,
    characterised in the supply speed of the respective trailing workpiece (1) in the transfer transport device (9) is preferably variably regulated.
  10. The method according to any one of claims 7 to 9,
    characterised in that the supply speed of the respective trailing workpiece (1) in the transfer transport device (9) is continuously newly calculated in the control unit.
  11. The method according to any one of claims 7 to 10,
    characterised in that the control unit operates with continuous position tracking of the workpieces (1)
  12. The method according to any one of claims 7 to 11, characterised in that the recorded and stored values of the cut list are used for regulating the supply speed of the workpieces (1).
  13. The method according to any one of claims 7 to 12,
    characterised in that the trailing workpieces are supplied to the sawing station (2) without interruption of the supply speed.
EP15002204.4A 2014-08-04 2015-07-25 Device and method for making chop cuts in work pieces made of wood Active EP2982485B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201530229T SI2982485T1 (en) 2014-08-04 2015-07-25 Device and method for making chop cuts in work pieces made of wood

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014011689.1A DE102014011689A1 (en) 2014-08-04 2014-08-04 Apparatus and method for performing chop-cuts on wooden workpieces

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EP2982485A1 EP2982485A1 (en) 2016-02-10
EP2982485B1 true EP2982485B1 (en) 2018-02-21

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US (1) US9902084B2 (en)
EP (1) EP2982485B1 (en)
DE (1) DE102014011689A1 (en)
DK (1) DK2982485T3 (en)
SI (1) SI2982485T1 (en)

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Publication number Priority date Publication date Assignee Title
WO2021012202A1 (en) * 2019-07-24 2021-01-28 福建省得力机电有限公司 Intelligent log cutting and sawing machine
EP3928936A1 (en) * 2020-06-26 2021-12-29 Albert Handtmann Maschinenfabrik GmbH & Co. KG Shearing device
US11787081B1 (en) 2023-05-30 2023-10-17 Frametec Alpha IP LLC Wooden truss manufacturing system and method

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE4327040A1 (en) * 1993-08-12 1995-02-16 Wurster & Dietz Maschf Conveyor apparatus for timber products
US5617910A (en) * 1995-05-31 1997-04-08 Bend Wood Products, Inc. Position control apparatus and method for controlling the movement of a block in a woodworking machine
CA2521121C (en) * 2003-04-29 2011-06-14 Coe Newnes/Mcgehee Ulc Optimized planermill system and method
DE102004010334A1 (en) * 2004-02-24 2005-09-08 GreCon Dimter Holzoptimierung Süd GmbH & Co. KG Method for sawing wood
NO324588B1 (en) * 2006-03-31 2007-11-26 Bergene Holm As Device at a production line of two or more woodworking and processing stations.
DE102009021729A1 (en) * 2009-05-11 2010-11-18 Michael Weinig Ag Machine for machining workpieces made of wood, plastic and the like
US20140290456A1 (en) * 2013-03-15 2014-10-02 Hasko, Inc. Two-saw assembly high-speed production chop-saw

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Title
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SI2982485T1 (en) 2018-05-31
US9902084B2 (en) 2018-02-27
DE102014011689A1 (en) 2016-02-04
DK2982485T3 (en) 2018-05-22
EP2982485A1 (en) 2016-02-10
US20160031115A1 (en) 2016-02-04

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