EP0277591B1 - Apparatus for manufacturing thin boards - Google Patents

Apparatus for manufacturing thin boards Download PDF

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Publication number
EP0277591B1
EP0277591B1 EP88101211A EP88101211A EP0277591B1 EP 0277591 B1 EP0277591 B1 EP 0277591B1 EP 88101211 A EP88101211 A EP 88101211A EP 88101211 A EP88101211 A EP 88101211A EP 0277591 B1 EP0277591 B1 EP 0277591B1
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EP
European Patent Office
Prior art keywords
pressure
feed rollers
squared timber
cutting
cutting means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88101211A
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German (de)
French (fr)
Other versions
EP0277591A3 (en
EP0277591A2 (en
Inventor
Gönner Siegmar
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.)
Gebrueder Linck GmbH and Co KG Gatterlinck Maschinen Fabrik
Original Assignee
Gebrueder Linck GmbH and Co KG Gatterlinck Maschinen Fabrik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gebrueder Linck GmbH and Co KG Gatterlinck Maschinen Fabrik filed Critical Gebrueder Linck GmbH and Co KG Gatterlinck Maschinen Fabrik
Priority to AT88101211T priority Critical patent/ATE79584T1/en
Publication of EP0277591A2 publication Critical patent/EP0277591A2/en
Publication of EP0277591A3 publication Critical patent/EP0277591A3/en
Application granted granted Critical
Publication of EP0277591B1 publication Critical patent/EP0277591B1/en
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Classifications

    • 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
    • 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
    • B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees
    • B27B25/02—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees with feed and pressure rollers
    • 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
    • B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees
    • B27B25/04—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees with feed chains or belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L5/00—Manufacture of veneer ; Preparatory processing therefor
    • B27L5/06—Cutting strips from a stationarily- held trunk or piece by a rocking knife carrier, or from rocking trunk or piece by a stationarily-held knife carrier; Veneer- cutting machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6476—Including means to move work from one tool station to another
    • Y10T83/6483—Tool stations staggered relative to one another
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6584—Cut made parallel to direction of and during work movement
    • Y10T83/6587—Including plural, laterally spaced tools
    • Y10T83/6588—Tools mounted on common tool support

Definitions

  • the invention relates to a device for producing thin boards by cutting the boards without cutting from a log or squared timber on one or respectively opposite sides of the squared timber.
  • the device has a feed path for the squared timber and a cutting device arranged on one side of the feed path with one or more stiff blades which can be staggered one behind the other or can be made to oscillate to separate the boards.
  • the cutting device there is either a pressing device or one of the first corresponding second cutting devices, at least the pressing device or one of the cutting devices being able to be pressed against the squared timber and thus against the opposite cutting device.
  • the apparatus has feed means which advance the square timber against the knife or blades of the cutting devices with at least one pair of feed rollers which grip the square timber on opposite sides.
  • the basic concern with such non-cutting processes is to have a sufficiently good surface quality for the boards to achieve. This is very difficult because of the tendency of the wood to split and tear.
  • a device has been tested which has a cutting knife on one side and a pressure belt with pressure rollers on the opposite side. The pressure belt with the pressure rollers is used both for applying the pressure forces and the feed forces.
  • the contact pressure to achieve a good cut quality does not necessarily correspond to the pressure required to apply the high feed forces required against the cutting knife or the cutting knife set, the contact pressure cannot be selected solely according to the requirements of the cutting quality.
  • the object is achieved in that the feed means moving the squared timber consist of at least one pair of feed rollers gripping the squared timber on opposite sides, each pair of feed rollers being movable in a direction transverse to the feed path regardless of the clamping force exerted on the squared timber is arranged to be able to adapt to the position of the squared timber determined by the contact pressure on the cutting device while maintaining symmetrical clamping forces.
  • each pair of feed rollers including the force-generating means that apply the clamping force, is arranged on a carriage that is freely movable transversely to the feed direction.
  • the force-generating means that apply the clamping force are pressurized fluids that are articulated on the frame and that are articulated to the frame, each of the working cylinders of a pair of rollers being connected to one another by an overflow line.
  • a desired number of pairs of feed rollers can be arranged in front of and behind the cutting device. If, in the case of a device with a cutting device and an opposing pressure device, the latter consists of a sequence of pressure rollers which can be pressed individually against the squared timber and whose pressure force is transmitted to the squared timber via a circumferential rubber band, the rubber band can also wrap around the feed rollers located on the side of the pressure device.
  • the contact pressure of the pressure device or the second cutting device can expediently be controlled independently of the clamping force of the feed rollers.
  • the pairs of feed rollers in front of and behind the cutting device can advantageously be moved apart and adjusted independently of one another so that the front pairs of feed rollers can already be opened for inserting a new square timber if the previous square timber is still held by the rear pairs of feed rollers.
  • the contact pressure to achieve a good cut quality does not necessarily match the pressure required to apply the high feed forces required against the cutting knives, these elements have been separated.
  • the high forces on the feed rollers were not allowed to disrupt the position of the wood determined by the pressure of the wood on the cutting knives. Therefore, the pairs of feed rollers were arranged in a floating position relative to the pressure rollers or the second cutting knife device.
  • the device shown schematically in FIG. 1 in plan view passes through a timber 1 being processed in the direction of arrow 2 on a feed path (not shown), as is known in woodworking devices.
  • This feed path can consist, for example, of an elongated support plate, which is height-adjustable if necessary, on which the square timber 1 rests and slides along.
  • the device processing the squared timber 1 is arranged essentially on both sides of the feed line or the squared timber to be processed. It has a left frame part 3 and a right frame part 4, of which the right frame part 4 can be displaced transversely to the feed direction 2 of the square timber 1, for example by means of a spindle drive 5, on horizontal sliding supports 6.
  • the support structure 7 for the sliding guide 6 of the right frame part 4 can be connected to the left frame part 3 below the transport path by means of a common machine base.
  • the transverse movement of the right frame part 4 only serves to be able to move the left and right parts of the device apart and to be able to adjust the device to squares 1 of different widths.
  • the right frame part 4 is set to a fixed position and can be regarded as fixed to the frame in the following for the description of the operation of the machine like the left frame part 3.
  • the machine is divided into a feed device 8 seen in the feed direction 2 of the wood, which is only surrounded by a dash-dotted line to illustrate its functional relationship, the actual cutting device 9 and a pull-out device 10, which corresponds in structure to the feed device 8 and also for emphasis is surrounded by a dash-dotted line.
  • Each of these three functional groups 8, 9, 10 is divided into a portion that is located on the left frame part and one that is arranged on the right frame part.
  • the cutting device 9 consists of a knife holder 11, a knife 12 fastened to this, a pressure bar 13 arranged upstream of the knife edge and guide surfaces 14 provided on both sides of the knife arrangement.
  • the drawing shows how a thin board 15 from the square timber is laterally shown by the knife 12 1 separated and fed to a schematically illustrated straightening device 16, which, however, is not of particular interest in connection with the present invention.
  • the knife arrangement attached to the frame part 3 is provided on the frame part 4 opposite a sequence of pressure rollers 17. These pressure rollers are each pivotally mounted in a pivot point 19 in the right frame part 4 by means of a pivot arm 18.
  • a pressure cylinder 20 acts on each of the swivel arms 19 and is supported on the right frame part 4 with its other end fixed to the frame.
  • All pressure rollers 17 lie within a circumferential rubber belt 21, which is guided over two deflection rollers 22 and 23, which are also rotatably mounted in the right frame part 4. Via the rubber belt 21, the pressure rollers press the squared timber 1 against the on the pressurized cylinder 20 with pressure fluid opposite frame part 3 located knife assembly.
  • the pressure rollers 17 can be acted upon individually, but also jointly with pressure fluid.
  • the pressure bar 13 of the knife arrangement protrudes somewhat more in the direction of the square timber 1 than the guide surfaces 14.
  • the pressure bar 13 is pressed into the square timber 1 which is moving past. This is necessary in order to avoid splitting of the wood in front of the knife 12 when the boards 15 are cut without cutting.
  • the pressure and the manner in which the squared timber 1 is pressed against the knife arrangement is decisive for the quality of the products obtained, which is why the arrangement and design of the pressure rollers and the control of their contact pressure are of particular importance.
  • a device with a single knife 12 is shown. If necessary, however, a plurality of knives can also be arranged in a staggered manner one behind the other. Furthermore, it is possible to arrange the knife arrangement in a separate holder in the left frame part 3 in order to give it an oscillating movement in a direction perpendicular to the plane of the drawing which runs in the direction of the feed direction 2 during the cutting process.
  • the feed device 8 has two pairs of feed rollers 24 and 25, each of which has a left feed roller 26 and a right feed roller 27. Every feed roll 26, 27 is pivotally mounted in a pivot point 29 in one of the frame parts 3 and 4 by means of a pivot arm 28.
  • the pair of pinch rollers 24 is shown again separately in part in FIG. 3.
  • the working cylinders 30 of the feed rollers 26 and 27 can be acted upon with pressure fluid via a line 31.
  • the feed rollers 26 and 27 must generally be subjected to a higher contact pressure than is the case for an optimal cutting result with the pressure rollers 17.
  • the pressure rollers 17 and the feed rollers 26, 27 can therefore preferably be controlled separately with regard to their pressurization.
  • the rubber belt 21 also wraps around the right feed rollers 27.
  • the feed forces must therefore also be transmitted to the square timber 1 here via the rubber belt 2I.
  • This is pure Appropriate measure for constructional reasons, since if the deflection rollers 22 and 23 are arranged for the rubber belt outside the feed rollers 27, the latter can be positioned closer to the cutting device 9.
  • a front measuring barrier 33 and a rear measuring barrier 34 are also provided, which are located in the area of the pull-in device and the pull-out device. These measuring barriers are intended to signal the presence of a squared timber in the pull-in device 8 or the pull-out device 10 for a corresponding control of the device. It is within the meaning of the invention if not only the working cylinders 30 of each pair of feed rollers 24 and 25 are connected to one another by an overflow line 32, but all feed rollers can also be connected to one another by overflow lines in order to achieve a uniform contact pressure everywhere. The only important thing is that the feed rollers do not impose a position on the squared timber 1 which differs from that which is specified by the cutting device 9.
  • the feed rollers of the feed device 8 and the pull-out device 10 are separately controllable. With a continuous sequence of wood, it would basically suffice, just one To provide feed device.
  • the provision of a second feed device in the form of the draw-off device essentially has the purpose of being able to pull the end of a squared timber that is being processed through the cutting device 9 while the feed device is already engaging a new squared timber. If the end of a square timber passes one of the measuring barriers 33, 34, the associated feed device opens. If the start of a new square timber enters the measuring barrier, the associated feed device closes again.
  • FIG. 2 shows the schematic top view of a variant of the device according to FIG. 1, which has opposite knives 12, in order to simultaneously cut off a thin board 15 from opposite sides of the square timber 1.
  • the left cutting device shown above in the drawing corresponds exactly to that according to FIG. 1.
  • the right cutting device 35 shown below in FIG. 2 differs from the left one in that it is arranged within the right frame part 4 on an independent support 36. which is articulated at one end at 37 to the right frame part 4 and is supported at its other end by means of a pressure cylinder 38 on the frame part 4. By applying pressure fluid to the pressure cylinder 38, the pressure can be set with which the cutting devices 9 and 35 are pressed against the square timber 1.
  • the pressure-adjustable version of the cutting device 35 replaces the pressure rollers 17 of the embodiment according to FIG. 1. Since two cutting devices are provided according to FIG. 2, the rubber belt 21 surrounding the pressure rollers in FIG. 1 is also omitted. All the feed rollers 26, 27 are therefore located directly at Kantholz 1. In this version, too, the working cylinders of pairs of opposing feed rollers are connected to one another by an overflow line.
  • FIG. 4 shows another embodiment for the freely movable arrangement of a pair of feed rollers.
  • the feed rollers 40 and 41 are located on a carriage 42 which can be freely moved back and forth in guides 43 in the direction transverse to the feed direction 2. Since the carriage 42 can move transversely, it is only necessary in this embodiment to provide a feed roller of a pair of feed rollers, in the example the feed roller 40, with a working cylinder 44 which is supported on the carriage 42 itself.
  • This arrangement not only has the disadvantage that it is structurally more complex than the arrangement according to FIGS. 1-3, it also has the disadvantage that, with a limited working stroke of the working cylinder 44, the machine cannot be easily moved apart as a whole, such as this is provided by the provision of the movable frame part 4 in the embodiments of FIGS. 1-3.
  • the overflow pressure line 32 between the feed cylinders opposite to each other can be laid with enough reserve length to move both side parts of the machine as a whole apart.

Abstract

An apparatus for producing thin boards by chipless cutting of the boards from a log or a squared timber on one or both opposing sides of the timber where the apparatus includes a support means for the article being cut and a cutter station which is arranged in at least one side of the support and including a cutter blade engageable with the squared timber. A pressure applying means is located on the other side of the squared timber opposite from the cutter station to urge the squared timber against the cutter station at an adjustable pressure. A feed system is arranged to move the squared timber toward the cutter blade, and includes at least one pair of feed rollers which are floatingly supported in a direction transverse to the support. The rollers are arranged to adapt to the position of the squared timber developed by the contact pressure at the contact station while maintaining symmetrical clamping forces.

Description

Die Erfindung betrifft eine Vorrichtung zur Erzeugung von dünnen Brettern durch spanlos schneidendes Abtrennen der Bretter von einem Holzstamm oder Kantholz an einer oder jeweils gegenüberliegenden Seiten des Kantholzes. Die Vorrichtung weist eine Vorschubbahn für das Kantholz und eine auf einer Seite der Vorschubbahn angeordnete Schneideinrichtung mit einem oder mehreren gestaffelt hintereinander angeordneten starren oder in Schwingbewegung versetzbaren Messern zum Abtrennen der Bretter auf. Gegenüberliegend der Schneideinrichtung ist entweder eine Andruckeinrichtung oder eine der ersten entsprechende zweite Schneideinrichtung angeordnet, wobei mindestens die Andruckeinrichtung bzw. eine der Schneideinrichtungen gegen das Kantholz und somit gegen die gegenüberliegende Schneideinrichtung andrückbar ist. Weiterhin weist die Vorrichtung das Kantholz gegen das bzw. die Messer der Schneideinrichtungen vorschiebende Vorschubmittel mit mindestens einem Paar von das Kantholz an gegenüberliegenden Seiten erfassenden Vorschubrollen auf.The invention relates to a device for producing thin boards by cutting the boards without cutting from a log or squared timber on one or respectively opposite sides of the squared timber. The device has a feed path for the squared timber and a cutting device arranged on one side of the feed path with one or more stiff blades which can be staggered one behind the other or can be made to oscillate to separate the boards. Opposite the cutting device there is either a pressing device or one of the first corresponding second cutting devices, at least the pressing device or one of the cutting devices being able to be pressed against the squared timber and thus against the opposite cutting device. Furthermore, the apparatus has feed means which advance the square timber against the knife or blades of the cutting devices with at least one pair of feed rollers which grip the square timber on opposite sides.

Grundanliegen bei derartigen spanlosen Trennverfahren ist es, eine ausreichend gute Oberflächenqualität der Bretter zu erzielen. Dies ist wegen der Spalt- und Ausreißneigung des Holzes sehr schwierig. Es ist eine Vorrichtung erprobt worden, die einseitig ein Schneidmesser und gegenüberliegend ein Anpreßband mit Anpreßwalzen aufweist. Dabei wird das Anpreßband mit den Anpreßwalzen sowohl für das Aufbringen der Anpreßkräfte wie auch der Vorschubkräfte verwendet. Da aber der Anpreßdruck zum Erreichen einer guten Schnittqualität nicht unbedingt mit dem Druck übereinstimmt, der zur Aufbringung der hohen erforderlichen Vorschubkräfte gegen das Schneidmesser bzw. den Schneidmessersatz erforderlich ist, kann die Anpreßkraft nicht allein nach den Erfordernissen der Schnittqualität gewählt werden.The basic concern with such non-cutting processes is to have a sufficiently good surface quality for the boards to achieve. This is very difficult because of the tendency of the wood to split and tear. A device has been tested which has a cutting knife on one side and a pressure belt with pressure rollers on the opposite side. The pressure belt with the pressure rollers is used both for applying the pressure forces and the feed forces. However, since the contact pressure to achieve a good cut quality does not necessarily correspond to the pressure required to apply the high feed forces required against the cutting knife or the cutting knife set, the contact pressure cannot be selected solely according to the requirements of the cutting quality.

Bei gegenüberliegenden Schneidmesseranordnungen ist es zwar erforderlich und aus der DE-OS 33 43 294 bekannt, von der Anpreßeinrichtung getrennte Vorschubelemente vorzusehen, da durch den Andruck des gegenüberliegenden Schneidmessersatzes kein Vorschub erzielt werden kann. Die bisher verwendeten Vorschubrollen, die im wesentlichen zur Anpassung an unterschiedliche Stammdicken an Schwenkarmen gelagert sind, boten nicht die Möglichkeit, hohe Klemmkräfte für die hohen erforderlichen Vorschubkräfte bei der spanlosen Zerteilung aufzubringen, ohne daß damit kräftemäßig auch die Anpreßbedingungen des Holzes zwischen den Schneidmessersätzen beeinflußt wurden, d.h., es waren keine symmetrisch hohen Klemmkräfte unabhängig von der jeweiligen Lage des Holzstammes bzw. Kantholzes möglich.In the case of opposing cutting knife arrangements it is necessary and known from DE-OS 33 43 294 to provide feed elements which are separate from the pressing device, since no feed can be achieved by pressing on the opposing cutting knife set. The feed rollers used so far, which are essentially mounted on swivel arms to adapt to different trunk thicknesses, did not offer the possibility of applying high clamping forces for the high required feed forces during non-cutting cutting, without the force of pressure on the wood between the sets of cutting knives also being affected , ie, no symmetrically high clamping forces were possible regardless of the position of the log or squared timber.

Es war somit Aufgabe der vorliegenden Erfindung, einerseits die Klemmkräfte für den Vorschub unabhängig von der Anpressung gegen die Schneidmesser steuern zu können und andererseits die Vorschubklemmung rückwirkungsfrei auf die Lage des Holzstammes bzw. Kantholzes durch dessen Anpressung zu gestalten.It was therefore an object of the present invention, on the one hand, to be able to control the clamping forces for the feed independently of the pressure against the cutting knives and, on the other hand, to design the feed clamping without reaction to the position of the log or squared timber by pressing it.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß die das Kantholz bewegenden Vorschubmittel aus mindestens einem Paar von das Kantholz an gegenüberliegenden Seiten erfassenden Vorschubrollen bestehen, wobei jedes Paar von Vorschubrollen unabhängig von der von ihm gegen das Kantholz ausgeübten Klemmkraft in einer Richtung quer zur Vorschubbahn schwimmend beweglich angeordnet ist, um sich unter Beibehaltung symmetrischer Klemmkräfte der durch den Anpreßdruck an der Schneideinrichtung bestimmten Lage des Kantholzes anpassen zu können.According to the invention the object is achieved in that the feed means moving the squared timber consist of at least one pair of feed rollers gripping the squared timber on opposite sides, each pair of feed rollers being movable in a direction transverse to the feed path regardless of the clamping force exerted on the squared timber is arranged to be able to adapt to the position of the squared timber determined by the contact pressure on the cutting device while maintaining symmetrical clamping forces.

Bei einer möglichen Ausführungsform ist jedes Paar von Vorschubrollen einschließlich der die Klemmkraft aufbringenden Krafterzeugungsmittel auf einem quer zur Vorschubrichtung frei beweglichen Schlitten angeordnet.In one possible embodiment, each pair of feed rollers, including the force-generating means that apply the clamping force, is arranged on a carriage that is freely movable transversely to the feed direction.

Bei einer bevorzugten Ausführungsform sind die die Klemmkraft aufbringenden Krafterzeugungsmittel mit Druckfluid beaufschlagte Arbeitszylinder, die gestellfest angelenkt sind, wobei jeweils die Arbeitszylinder eines Rollenpaares durch eine Überströmleitung miteinander verbunden sind. Eine gewünschte Anzahl von Vorschubrollenpaaren kann jeweils vor und hinter der Schneideinrichtung angeordnet sein. Wenn bei einer Vorrichtung mit einer Schneideinrichtung und einer gegenüberliegenden Andruckeinrichtung letztere aus einer Folge von einzeln gegen das Kantholz andrückbaren Andruckrollen besteht, deren Andruckkraft über ein umlaufendes Gummiband auf das Kantholz übertragen wird, kann das Gummiband auch die auf der seite der Andruckeinrichtung befindlichen Vorschubrollen umschlingen.In a preferred embodiment, the force-generating means that apply the clamping force are pressurized fluids that are articulated on the frame and that are articulated to the frame, each of the working cylinders of a pair of rollers being connected to one another by an overflow line. A desired number of pairs of feed rollers can be arranged in front of and behind the cutting device. If, in the case of a device with a cutting device and an opposing pressure device, the latter consists of a sequence of pressure rollers which can be pressed individually against the squared timber and whose pressure force is transmitted to the squared timber via a circumferential rubber band, the rubber band can also wrap around the feed rollers located on the side of the pressure device.

Die Anpreßkraft der Andruckeinrichtung bzw. der zweiten Schneideinrichtung ist zweckmäßigerweise unabhängig von der Klemmkraft der Vorschubrollen steuerbar.The contact pressure of the pressure device or the second cutting device can expediently be controlled independently of the clamping force of the feed rollers.

Die Vorschubrollenpaare vor und hinter der Schneideinrichtung sind vorteilhafterweise unabhängig voneinander auseinander fahrbar und anstellbar, damit zum Einführen eines neuen Kantholzes die vorderen Vorschubrollenpaare bereits geöffnet werden können, wenn das vorhergehende Kantholz noch durch die hinteren Vorschubrollenpaare gehalten wird.The pairs of feed rollers in front of and behind the cutting device can advantageously be moved apart and adjusted independently of one another so that the front pairs of feed rollers can already be opened for inserting a new square timber if the previous square timber is still held by the rear pairs of feed rollers.

Da der Anpreßdruck zum Erreichen einer guten Schnittqualität nicht unbedingt mit dem Druck übereinstimmt, der zur Aufbringung der hohen erforderlichen Vorschubkräfte gegen die Schneidmesser erforderlich ist, wurden diese Elemente getrennt. Dabei durften aber die hohen Kräfte an den Vorschubrollen die durch die Anpressung des Holzes an die Schneidmesser bestimmte Lage des Holzes kräftemäßig nicht stören. Deshalb wurden die Vorschubrollenpaare gegenüber den Anpreßrollen bzw. der zweiten Schneidmessereinrichtung in schwimmender Lage angeordnet.Since the contact pressure to achieve a good cut quality does not necessarily match the pressure required to apply the high feed forces required against the cutting knives, these elements have been separated. However, the high forces on the feed rollers were not allowed to disrupt the position of the wood determined by the pressure of the wood on the cutting knives. Therefore, the pairs of feed rollers were arranged in a floating position relative to the pressure rollers or the second cutting knife device.

Im folgenden wird die Erfindung unter Hinweis auf die beigefügten Zeichnungen im einzelnen näher erläutert. In den Zeichnungen stellen dar:

Fig. 1
eine schematische Draufsicht auf eine Vorrichtung zum Erzeugen von dünnen Brettern, die mit einem einzelnen Schneidmesser zum einseitigen Abtrennen eines Brettes von einem Stamm versehen ist,
Fig. 2
eine schematische Draufsicht auf eine andere Ausführungsform der Maschine, welche mit zwei gegenüberliegenden Einzelmessern versehen ist, um von gegenüberliegenden Seiten des Stammes gleichzeitig jeweils ein Brett abzutrennen,
Fig. 3
die schematische Anordnung eines bei den Vorrichtungen nach Fig. 1 und 2 verwendeten Vorschubrollenpaares und
Fig. 4
eine andere Anordnung eines Vorschubrollenpaares, bei der die Vorschubrollen auf einem gemeinsamen beweglichen Schlitten angeordnet sind.
The invention is explained in more detail below with reference to the accompanying drawings. In the drawings:
Fig. 1
1 shows a schematic top view of a device for producing thin boards, which is provided with a single cutting knife for unilaterally separating a board from a trunk,
Fig. 2
2 shows a schematic top view of another embodiment of the machine, which is provided with two opposite individual knives in order to simultaneously cut off a board from opposite sides of the trunk,
Fig. 3
the schematic arrangement of a pair of feed rollers used in the devices of FIGS. 1 and 2 and
Fig. 4
another arrangement of a pair of feed rollers, in which the feed rollers are arranged on a common movable carriage.

Die in Fig. 1 in Draufsicht schematisch dargestellte Vorrichtung durchläuft ein in Bearbeitung befindliches Kantholz 1 in Richtung des Pfeiles 2 auf einer (nicht dargestellten) Vorschubbahn, wie sie bei holzverarbeitenden Vorrichtungen bekannt sind. Diese Vorschubbahn kann beispielsweise aus einer erforderlichenfalls höhenverstellbaren langgestreckten Auflageplatte bestehen, auf der das Kantholz 1 ruht und entlanggleitet. Es sind aber auch andere Ausführungen für eine solche Vorschubbahn denkbar. Die das Kantholz 1 bearbeitende Vorrichtung ist im wesentlichen zu beiden Seiten der Vorbschubbahn bzw. des zu bearbeitenden Kantholzes angeordnet. Sie weist einen linken Rahmenteil 3 und einen rechten Rahmenteil 4 auf, von denen der rechte Rahmenteil 4 beispielsweise mittels eines Spindeltriebes 5 auf horizontalen Gleitsupporten 6 quer zur Vorschubrichtung 2 des Kantholzes 1 verschiebbar ist. Die Stützkonstruktion 7 für die Gleitführung 6 des rechten Rahmenteiles 4 kann unterhalb der Transportbahn mit dem linken Rahmenteil 3 mittels eines gemeinsamen Maschinensockels verbunden sein. Die Querverfahrbarkeit des rechten Rahmenteils 4 dient lediglich dazu, die linken und rechten Teile der Vorrichtung auseinanderfahren zu können, und um die Vorrichtung auf unterschiedlich breite Kanthölzer 1 einstellen zu können. Für die Verarbeitung von Kanthölzern gleicher Breite wird der rechte Rahmenteil 4 auf eine feste Position eingestellt und kann im folgenden für die Beschreibung der Arbeitsweise der Maschine wie der linke Rahmenteil 3 als gestellfest betrachtet werden.The device shown schematically in FIG. 1 in plan view passes through a timber 1 being processed in the direction of arrow 2 on a feed path (not shown), as is known in woodworking devices. This feed path can consist, for example, of an elongated support plate, which is height-adjustable if necessary, on which the square timber 1 rests and slides along. However, other designs for such a feed path are also conceivable. The device processing the squared timber 1 is arranged essentially on both sides of the feed line or the squared timber to be processed. It has a left frame part 3 and a right frame part 4, of which the right frame part 4 can be displaced transversely to the feed direction 2 of the square timber 1, for example by means of a spindle drive 5, on horizontal sliding supports 6. The support structure 7 for the sliding guide 6 of the right frame part 4 can be connected to the left frame part 3 below the transport path by means of a common machine base. The transverse movement of the right frame part 4 only serves to be able to move the left and right parts of the device apart and to be able to adjust the device to squares 1 of different widths. For the processing of squared timbers of the same width, the right frame part 4 is set to a fixed position and can be regarded as fixed to the frame in the following for the description of the operation of the machine like the left frame part 3.

Funktionsmäßig gliedert sich die Maschine in Vorschubrichtung 2 des Holzes gesehen in eine Einzugseinrichtung 8, die lediglich zur Veranschaulichung ihres Funktionszusammenhanges mit einer strichpunktierten Linie umgeben ist, die eigentliche Schneideinrichtung 9 und eine Auszugseinrichtung 10, die in ihrem Aufbau der Einzugseinrichtung 8 entspricht und ebenfalls zur Hervorhebung mit einer strichpunktierten Linie umgeben ist. Jede dieser drei Funktionsgruppen 8, 9, 10 gliedert sich jeweils in einen Anteil, der sich auf dem linken Rahmenteil befindet, und einen solchen, der auf dem rechten Rahmenteil angeordnet ist.Functionally, the machine is divided into a feed device 8 seen in the feed direction 2 of the wood, which is only surrounded by a dash-dotted line to illustrate its functional relationship, the actual cutting device 9 and a pull-out device 10, which corresponds in structure to the feed device 8 and also for emphasis is surrounded by a dash-dotted line. Each of these three functional groups 8, 9, 10 is divided into a portion that is located on the left frame part and one that is arranged on the right frame part.

Die Schneideinrichtung 9 besteht aus einem Messerhalter 11, einem an diesem befestigten Messer 12, einer der Messerschneide vorgelagerten Andruckleiste 13 und zu beiden Seiten der Messeranordnung vorgesehenen Führungsflächen 14. In der Zeichnung ist dargestellt, wie durch das Messer 12 seitlich ein dünnes Brett 15 vom Kantholz 1 abgetrennt und einer schematisch dargestellten Richteinrichtung 16 zugeführt wird, die im Zusammenhang mit der vorliegenden Erfindung jedoch nicht von näherem Interesse ist. Der am Rahmenteil 3 angebrachten Messeranordnung gegenüberliegend auf dem Rahmenteil 4 ist eine Folge von Andruckrollen 17 vorgesehen. Diese Andruckrollen sind jeweils mittels eines Schwenkarmes 18 in einem Drehpunkt 19 schwenkbar im rechten Rahmenteil 4 gelagert. An jedem der Schwenkarme 19 greift ein Druckzylinder 20 an, der mit seinem anderen Ende gestellfest am rechten Rahmenteil 4 abgestützt ist. Sämtliche Andruckrollen 17 liegen innerhalb eines umlaufenden Gummigurtes 21, der über zwei Umlenkrollen 22 und 23 geführt ist, die ebenfalls drehbar im rechten Rahmenteil 4 gelagert sind. Über den Gummigurt 21 drücken die Andruckrollen bei Beaufschlagung ihrer Druckzylinder 20 mit Druckfluid das Kantholz 1 gegen die auf dem gegenüberliegenden Rahmenteil 3 befindliche Messeranordnung. Die Andruckrollen 17 können einzeln, aber auch gemeinsam mit Druckfluid beaufschlagbar sein.The cutting device 9 consists of a knife holder 11, a knife 12 fastened to this, a pressure bar 13 arranged upstream of the knife edge and guide surfaces 14 provided on both sides of the knife arrangement. The drawing shows how a thin board 15 from the square timber is laterally shown by the knife 12 1 separated and fed to a schematically illustrated straightening device 16, which, however, is not of particular interest in connection with the present invention. The knife arrangement attached to the frame part 3 is provided on the frame part 4 opposite a sequence of pressure rollers 17. These pressure rollers are each pivotally mounted in a pivot point 19 in the right frame part 4 by means of a pivot arm 18. A pressure cylinder 20 acts on each of the swivel arms 19 and is supported on the right frame part 4 with its other end fixed to the frame. All pressure rollers 17 lie within a circumferential rubber belt 21, which is guided over two deflection rollers 22 and 23, which are also rotatably mounted in the right frame part 4. Via the rubber belt 21, the pressure rollers press the squared timber 1 against the on the pressurized cylinder 20 with pressure fluid opposite frame part 3 located knife assembly. The pressure rollers 17 can be acted upon individually, but also jointly with pressure fluid.

Es sei hervorgehoben, daß die Andruckleiste 13 der Meseranordnung etwas mehr in Richtung auf das Kantholz 1 vorsteht als die Führungsflächen 14. Durch Anpressen des Kantholzes 1 gegen die Führungsflächen 14 mittels der Andruckrollen 17 wird die Andruckleiste 13 in das vorbeibewegte Kantholz 1 hineingepreßt. Dies ist erforderlich, um bei dem spanlosen Abtrennen der Bretter 15 ein Spalten des Holzes vor dem Messer 12 zu vermeiden. Der Druck und die Art und Weise, mit der das Kantholz 1 gegen die Messeranordnung angepreßt wird, ist für die Qualität der erhaltenen Erzeugnisse entscheidend, weswegen auch der Anordnung und der Ausbildung der Andruckrollen sowie der Steuerung von deren Anpreßdruck eine besondere Bedeutung zukommt.It should be emphasized that the pressure bar 13 of the knife arrangement protrudes somewhat more in the direction of the square timber 1 than the guide surfaces 14. By pressing the square timber 1 against the guide surfaces 14 by means of the pressure rollers 17, the pressure bar 13 is pressed into the square timber 1 which is moving past. This is necessary in order to avoid splitting of the wood in front of the knife 12 when the boards 15 are cut without cutting. The pressure and the manner in which the squared timber 1 is pressed against the knife arrangement is decisive for the quality of the products obtained, which is why the arrangement and design of the pressure rollers and the control of their contact pressure are of particular importance.

Im Ausführungsbeispiel ist eine Vorrichtung mit einem einzigen Messer 12 dargestellt. Es können erforderlichenfalls aber auch mehrere Messer staffelförmig hintereinander angeordnet sein. Ferner ist es möglich, die Messeranordnung in einer getrennten Halterung im linken Rahmenteil 3 anzuordnen, um ihr während des Schneidvorganges eine Schwingbewegung in einer Richtung senkrecht zur Zeichenebene zu erteilen, welche in Richtung der Vorschubrichtung 2 verläuft.In the exemplary embodiment, a device with a single knife 12 is shown. If necessary, however, a plurality of knives can also be arranged in a staggered manner one behind the other. Furthermore, it is possible to arrange the knife arrangement in a separate holder in the left frame part 3 in order to give it an oscillating movement in a direction perpendicular to the plane of the drawing which runs in the direction of the feed direction 2 during the cutting process.

Im folgenden soll nun die Einzugseinrichtung 8 beschrieben werden, wobei diese Beschreibung in gleicher Weise auch für die im Ausführungsbeispiel der Fig. 1 entsprechend ausgeführte Auszugseinrichtung 10 gilt. Die Einzugseinrichtung 8 weist zwei Vorschubrollenpaare 24 und 25 auf, von denen jedes eine linke Vorschubrolle 26 und eine rechte Vorschubrolle 27 aufweist. Jede Vorschubrolle 26, 27 ist mittels eines Schwenkarmes 28 in einem Drehpunkt 29 schwenkbar in einem der Rahmenteile 3 bzw. 4 gelagert. An jedem Schwenkarm 28 greift ein Arbeitszylinder 30 an, der im zugehörigen Rahmenteil 3 bzw. 4 abgestützt ist. Das Andruckrollenpaar 24 ist auszugsweise in Fig. 3 nochmals getrennt dargestellt. Die Arbeitszylinder 30 der Vorschubrollen 26 und 27 sind über eine Leitung 31 mit Druckfluid beaufschlagbar. Ihre Zylinderräume sind jedoch zusätzlich über eine Druckleitung 32 miteinander querverbunden, so daß in beiden Zylindern 30 des Vorschubrollenpaares 24 jeweils das gleiche Druckniveau herrscht. In gleicher Weise sind die übrigen Vorschubrollenpaare der Einzugseinrichtung 8 und der Auszugseinrichtung 10 beaufschlagt. Durch diese Querverbindung der Druckräume der Arbeitszylinder eines Vorschubrollenpaares wird gewährleistet, daß bei Aufrechterhaltung eines gleichen Anpreßdruckes auf beiden Seiten des Kantholzes 1 letzteres dennoch in einem gewissen Maße frei querbeweglich ist, um der durch die Schneideinrichtung 9 vorgegebenen Arbeitslage auch in der Einzugs- und Auszugseinrichtung ungehindert folgen zu können. Dies ist für eine einwandfreie Arbeitsweise der Schneideinrichtung und das Erreichen einer hohen Erzeugnisqualität von Bedeutung. Da für den Vorschub des Kantholzes 1 gegen das bzw. die Messer 12 hohe Kräfte erforderlich sind, müssen die Vorschubrollen 26 und 27 im allgemeinen mit einem höheren Anpreßdruck beaufschlagt werden, als dies für ein optimales Schneidergebnis bei den Andruckrollen 17 der Fall ist. Bevorzugt sind daher die Andruckrollen 17 und die Vorschubrollen 26, 27 bezüglich ihrer Druckbeaufschlagung getrennt steuerbar.In the following, the pull-in device 8 will now be described, whereby this description also applies in the same way to the pull-out device 10, which is designed accordingly in the exemplary embodiment in FIG. 1. The feed device 8 has two pairs of feed rollers 24 and 25, each of which has a left feed roller 26 and a right feed roller 27. Every feed roll 26, 27 is pivotally mounted in a pivot point 29 in one of the frame parts 3 and 4 by means of a pivot arm 28. A working cylinder 30, which is supported in the associated frame part 3 or 4, acts on each swivel arm 28. The pair of pinch rollers 24 is shown again separately in part in FIG. 3. The working cylinders 30 of the feed rollers 26 and 27 can be acted upon with pressure fluid via a line 31. However, their cylinder spaces are additionally connected to one another via a pressure line 32, so that the same pressure level prevails in both cylinders 30 of the pair of feed rollers 24. The other pairs of feed rollers of the feed device 8 and the pull-out device 10 are acted upon in the same way. This cross-connection of the pressure chambers of the working cylinders of a pair of feed rollers ensures that, while maintaining the same contact pressure on both sides of the square timber 1, the latter is still freely movable to a certain extent in order to unhindered the working position specified by the cutting device 9 even in the pull-in and pull-out devices to be able to follow. This is important for the cutting device to work properly and to achieve high product quality. Since high forces are required for the advance of the squared timber 1 against the knife (s) 12, the feed rollers 26 and 27 must generally be subjected to a higher contact pressure than is the case for an optimal cutting result with the pressure rollers 17. The pressure rollers 17 and the feed rollers 26, 27 can therefore preferably be controlled separately with regard to their pressurization.

Bei der Ausführungsform gemäß Fig. 1 umschlingt der Gummigurt 21 auch die rechten Vorschubrollen 27. Die Vorschubkräfte müssen daher hier auch über den Gummigurt 2I auf das Kantholz 1 übertragen werden. Dies ist eine rein aus konstruktiven Gründen zweckmäßige Maßnahme, da bei Anordnung der Umlenkrollen 22 und 23 für den Gummigurt außerhalb der Vorschubrollen 27 letztere näher an der Schneideinrichtung 9 positioniert werden können. Ebensogut wäre es aber auch möglich, die Vorschubrollen 27 außerhalb des Gummigurtes 21 anzuordnen. In der Natur der Vorschubrollen 26 und 27 liegt es, daß diese selbst mit einem (nicht dargestellten) Vorschubantrieb versehen sind. Es ist aber auch denkbar, den Antrieb in die Umlenkrollen 22 bzw. 23 zu verlegen oder auch beide Systeme mit Antrieben zu versehen. Bei den linken Vorschubrollen 26 stellt sich diese Frage nicht, da hier kein kraftübertragender Gummigurt zur Verfügung steht. Es wäre jedoch auch möglich, auf der linken Seite allein die Vorschubrollen 26 mit einem Gummigurt zu umgeben.In the embodiment according to FIG. 1, the rubber belt 21 also wraps around the right feed rollers 27. The feed forces must therefore also be transmitted to the square timber 1 here via the rubber belt 2I. This is pure Appropriate measure for constructional reasons, since if the deflection rollers 22 and 23 are arranged for the rubber belt outside the feed rollers 27, the latter can be positioned closer to the cutting device 9. However, it would also be possible to arrange the feed rollers 27 outside the rubber belt 21. It is in the nature of the feed rollers 26 and 27 that they themselves are provided with a feed drive (not shown). However, it is also conceivable to move the drive into the deflection rollers 22 or 23 or to provide both systems with drives. This question does not arise with the left feed rollers 26, since there is no force-transmitting rubber belt available here. However, it would also be possible to surround the feed rollers 26 on the left side alone with a rubber belt.

In der Vorrichtung gemäß Fig. 1 sind noch eine vordere Meßschranke 33 und eine hintere Meßschranke 34 vorgesehen, die sich im Bereich der Einzugseinrichtung bzw. der Auszugseinrichtung befinden. Diese Meßschranken sollen das Vorhandensein eines Kantholzes in der Einzugseinrichtung 8 bzw. der Auszugseinrichtung 10 für eine entsprechende Steuerung der Vorrichtung signalisieren. Im Sinne der Erfindung liegt es, wenn nicht nur die Arbeitszylinder 30 jedes Vorschubrollenpaares 24 bzw. 25 durch eine Überströmleitung 32 miteinander verbunden sind, es können auch alle Vorschubrollen durch Überströmleitungen miteinander verbunden sein, um überall einen gleichmäßigen Anpreßdruck zu erzielen. Wichtig ist nur, daß dem Kantholz 1 durch die Vorschubrollen nicht eine Lage aufgezwungen wird, die von derjenigen, welche durch die Schneideinrichtung 9 vorgegeben wird, abweicht. Zweckmäßig ist es jedoch, die Vorschubrollen der Einzugseinrichtung 8 und der Auszugseinrichtung 10 getrennt ansteuerbar auszuführen. Bei kontinuierlicher Holzfolge würde es im Grunde genommen ausreichen, lediglich eine Vorschubeinrichtung vorzusehen. Das Vorsehen einer zweiten Vorschubeinrichtung in Form der Abzugseinrichtung hat im wesentlichen den Sinn, das Ende eines in Bearbeitung befindlichen Kantholzes noch durch die Schneideinrichtung 9 ziehen zu können, während die Einzugseinrichtung bereits ein neues Kantholz in Eingriff nimmt. Passiert das Ende eines Kantholzes eine der Meßschranken 33, 34, so öffnet die zugehörige Vorschubeinrichtung. Tritt der Anfang eines neuen Kantholzes in die Meßschranke, schließt sich die zugehörige Vorschubeinrichtung wieder.In the device according to FIG. 1, a front measuring barrier 33 and a rear measuring barrier 34 are also provided, which are located in the area of the pull-in device and the pull-out device. These measuring barriers are intended to signal the presence of a squared timber in the pull-in device 8 or the pull-out device 10 for a corresponding control of the device. It is within the meaning of the invention if not only the working cylinders 30 of each pair of feed rollers 24 and 25 are connected to one another by an overflow line 32, but all feed rollers can also be connected to one another by overflow lines in order to achieve a uniform contact pressure everywhere. The only important thing is that the feed rollers do not impose a position on the squared timber 1 which differs from that which is specified by the cutting device 9. However, it is expedient to design the feed rollers of the feed device 8 and the pull-out device 10 to be separately controllable. With a continuous sequence of wood, it would basically suffice, just one To provide feed device. The provision of a second feed device in the form of the draw-off device essentially has the purpose of being able to pull the end of a squared timber that is being processed through the cutting device 9 while the feed device is already engaging a new squared timber. If the end of a square timber passes one of the measuring barriers 33, 34, the associated feed device opens. If the start of a new square timber enters the measuring barrier, the associated feed device closes again.

In Fig. 2 ist die schematische Draufsicht einer Variante der Vorrichtung nach Fig. 1 dargestellt, die gegenüberliegende Messer 12 aufweist, um gleichzeitig von gegenüberliegenden Seiten des Kantholzes 1 je ein dünnes Brett 15 abzutrennen. Die linke, in der Zeichnung oben dargestellte Schneideinrichtung entspricht genau derjenigen nach Fig. 1. Die rechte, in Fig. 2 unten dargestellte Schneideinrichtung 35 unterscheidet sich von der linken dadurch, daß sie innerhalb des rechten Rahmenteiles 4 auf einem selbständigen Support 36 angeordnet ist, der an seinem einen Ende bei 37 schwenkbar an den rechten Rahmenteil 4 angelenkt und an seinem anderen Ende mittels eines Druckzylinders 38 am Rahmenteil 4 abgestützt ist. Durch Beaufschlagung des Druckzylinders 38 mit Druckfluid läßt sich der Druck einstellen, mit dem die Schneideinrichtungen 9 und 35 gegen das Kantholz 1 angedrückt werden. Die unter Druck anstellbare Ausführung der Schneideinrichtung 35 ersetzt die Andruckrollen 17 der Ausführung nach Fig. 1. Da gemäß Fig. 2 zwei Schneideinrichtungen vorgesehen sind, entfällt auch der die Andruckrollen in Fig. 1 umgebende Gummigurt 21. Sämtliche Vorschubrollen 26, 27 liegen daher unmittelbar am Kantholz 1 an. Auch bei dieser Ausführung sind die Arbeitszylinder von Paaren sich gegenüberliegender Vorschubrollen durch eine Überströmleitung miteinander verbunden.FIG. 2 shows the schematic top view of a variant of the device according to FIG. 1, which has opposite knives 12, in order to simultaneously cut off a thin board 15 from opposite sides of the square timber 1. The left cutting device shown above in the drawing corresponds exactly to that according to FIG. 1. The right cutting device 35 shown below in FIG. 2 differs from the left one in that it is arranged within the right frame part 4 on an independent support 36. which is articulated at one end at 37 to the right frame part 4 and is supported at its other end by means of a pressure cylinder 38 on the frame part 4. By applying pressure fluid to the pressure cylinder 38, the pressure can be set with which the cutting devices 9 and 35 are pressed against the square timber 1. The pressure-adjustable version of the cutting device 35 replaces the pressure rollers 17 of the embodiment according to FIG. 1. Since two cutting devices are provided according to FIG. 2, the rubber belt 21 surrounding the pressure rollers in FIG. 1 is also omitted. All the feed rollers 26, 27 are therefore located directly at Kantholz 1. In this version, too, the working cylinders of pairs of opposing feed rollers are connected to one another by an overflow line.

In Fig. 4 ist eine andere Ausführung für die frei bewegliche Anordnung eines Vorschubrollenpaares dargestellt. Die Vorschubrollen 40 und 41 befinden sich auf einem Schlitten 42, der in Querrichtung zur Vorschubrichtung 2 in Führungen 43 frei hin- und herbewegbar ist. Da der Schlitten 42 querbeweglich ist, ist es bei dieser Ausführungsform lediglich erforderlich, eine Vorschubrolle eines Vorschubrollenpaares, im Beispiel die Vorschubrolle 40, mit einem Arbeitszylinder 44 zu versehen, der auf dem Schlitten 42 selbst abgestützt ist. Diese Anordnung hat nicht nur den Nachteil, daß sie konstruktiv aufwendiger ist als die Anordnung nach den Fig.-1-3, sie hat auch den Nachteil, daß bei begrenztem Arbeitshub des Arbeitszylinders 44 die Maschine nicht ohne weiteres als Ganzes auseinandergefahren werden kann, wie dies durch Vorsehen des beweglichen Rahmenteiles 4 bei den Ausführungsformen der Fig.-1-3 gegeben ist. Die Überströmdruckleitung 32 zwischen den Arbeitszylindern 30 sich gegenüberliegender Vorschubrollen kann mit genügend Reservelänge verlegt werden, um beide Seitenteile der Maschine als ganze auseinanderzufahren.4 shows another embodiment for the freely movable arrangement of a pair of feed rollers. The feed rollers 40 and 41 are located on a carriage 42 which can be freely moved back and forth in guides 43 in the direction transverse to the feed direction 2. Since the carriage 42 can move transversely, it is only necessary in this embodiment to provide a feed roller of a pair of feed rollers, in the example the feed roller 40, with a working cylinder 44 which is supported on the carriage 42 itself. This arrangement not only has the disadvantage that it is structurally more complex than the arrangement according to FIGS. 1-3, it also has the disadvantage that, with a limited working stroke of the working cylinder 44, the machine cannot be easily moved apart as a whole, such as this is provided by the provision of the movable frame part 4 in the embodiments of FIGS. 1-3. The overflow pressure line 32 between the feed cylinders opposite to each other can be laid with enough reserve length to move both side parts of the machine as a whole apart.

Claims (9)

  1. An apparatus for manufacturing thin boards by chipless severing of the boards from a log or squared timber on one side or respectively opposite sides thereof, comprising an advancing path for the squared timber, cutting means arranged on one side of said advancing path and including one cutting knife or several staggered cutting knives rigidly arranged or arranged for being put into vibratory movement for the severing of boards, pressure applying means or second cutting means corresponding to said first cutting means arranged opposite from said first cutting means on the other side of said advancing path, at least said pressure applying means or one of said cutting means, respectively, may be pressed against said squared timber and thus against said opposite cutting means, and further comprising advancing means for advancing said squared timber toward said cutting knife(s) of said cutting means, said advancing means including at least one pair of feed rollers engaging said squared timber on opposite sides, characterized in that each pair (24, 25) of feed rollers (26, 27) is arranged floatingly movable in a direction transverse to said advancing path (2) independent of the clamping force exerted against said squared timber (1) by that pair of feed rollers so that it can adapt to the position of said squared timber (1) determined by the pressure at said cutting means while maintaining symmetrical clamping forces.
  2. An apparatus according to claim 1, characterized in that each pair (24, 25) of said feed rollers (26, 27) including the force generating means (44) applying the clamping force is positioned on a slide (42) being freely movable transversely to said advancing direction.
  3. An apparatus according to claim 1, characterized in that the force generating means applying the clamping force are operating cylinders which are charged with pressurized fluid, charaterized in that said operating cylinders (30) of each pair (24, 25) of feed rollers are fixed on the support frame (3, 4) and that their cylinder spaces are interconnected by means of a pressure balancing conduit (32).
  4. An apparatus according to one of claims 1 to 3, characterized in that pairs of feed rollers (26, 27) are positioned upstream of and downstream of said cutting means (9, 35), respectively.
  5. An apparatus according to claim 4, characterized in that at least two pairs of feed rollers (226, 27) are provided upstream of and downstream of said cutting means (9, 35), respectively.
  6. An apparatus according to one of claims 1 to 5 comprising cutting means and opposite thereof pressure applying means, characterized in that said pressure applying means includes a sequence of pressure rollers (17) individually pressable against said squared timber, the roller pressure of said pressure rollers being transferred to said squared timber via a moving rubber belt (21).
  7. An apparatus according to claim 6, characterized in that said rubber belt (21) also embraces said feed rollers (27) positioned at the side of said pressure applying means.
  8. An apparatus according to one of claims 1 to 7, characterized in that the roller pressure of said pressure applying means (17), respectively said second cutting means (35) is controllable indepedently of the clamping force provided by the pairs of feed rollers (26, 27).
  9. An apparatus according to one of claims 1 to 8, characterized in that said pairs of feed rollers (26, 27) upstream of and downstream of said cutting means (9, 35) may independently of each other be moved apart and closed against each other.
EP88101211A 1987-01-31 1988-01-28 Apparatus for manufacturing thin boards Expired - Lifetime EP0277591B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88101211T ATE79584T1 (en) 1987-01-31 1988-01-28 DEVICE FOR PRODUCTION OF THIN BOARDS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873702909 DE3702909A1 (en) 1987-01-31 1987-01-31 DEVICE FOR THE PRODUCTION OF THICK BOARDS
DE3702909 1987-01-31

Publications (3)

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EP0277591A2 EP0277591A2 (en) 1988-08-10
EP0277591A3 EP0277591A3 (en) 1989-11-15
EP0277591B1 true EP0277591B1 (en) 1992-08-19

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US (1) US4825917A (en)
EP (1) EP0277591B1 (en)
JP (1) JPS63214403A (en)
AT (1) ATE79584T1 (en)
CA (1) CA1316083C (en)
DE (3) DE8701511U1 (en)
FI (1) FI86697C (en)
NO (1) NO164584C (en)

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DE4026346A1 (en) * 1989-11-01 1991-05-02 Linck Masch Gatterlinck METHOD FOR SPANLESS SPLITING OF A QUANTITY WOOD IN BOARDS OF THE SAME THICKNESS
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DE4033471A1 (en) * 1990-10-20 1992-04-23 Linck Masch Gatterlinck METHOD AND DEVICE FOR THE CHIP-FREE SEPARATION OF WOOD LAMPS FROM A SQUARE
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Also Published As

Publication number Publication date
FI86697C (en) 1992-10-12
NO880400L (en) 1988-08-01
NO880400D0 (en) 1988-01-29
DE8701511U1 (en) 1988-05-26
JPS63214403A (en) 1988-09-07
CA1316083C (en) 1993-04-13
DE3702909A1 (en) 1988-08-11
ATE79584T1 (en) 1992-09-15
DE3873782D1 (en) 1992-09-24
EP0277591A3 (en) 1989-11-15
FI880415A (en) 1988-08-01
NO164584B (en) 1990-07-16
FI86697B (en) 1992-06-30
EP0277591A2 (en) 1988-08-10
NO164584C (en) 1990-10-24
FI880415A0 (en) 1988-01-29
US4825917A (en) 1989-05-02

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