EP3106273B1 - Tool assembly for machining wooden panels - Google Patents

Description

The invention relates to a device and a method for processing the side surface of wood-based panels, according to the preambles of claims 1 and 7.

Side surfaces of wood-based panels have to be processed in order to produce a uniformly good, visually appealing panel, which in particular shows no tears at the edges or a predetermined edge profile. This is particularly important for boards that have a coating, especially a laminate. Known devices and methods see according to the DE 199 38 568 A1 and the DE 10 2006 034 437 B3 proposes that a scanning device detects the actual structure of the side surface of the plate and a tool adapts the actual structure to a desired structure. A disadvantage of these arrangements is that a new target structure has to be recorded and stored for each new plate. The DE-OS 19 14 403 (Closest prior art) describes a double-sided milling device in which each milling cutter is aligned with the surface of the plate by means of a feeler roller. The EP 0 571 816 A1 describes a milling device in which the milling tools each have to be realigned for a given plate.

It is therefore the object of the invention to propose an apparatus and a method which work without comparison with a target structure.

The object is achieved with a device according to claim 1 and a method according to claim 7. Subclaims are directed to advantageous embodiments of the invention.

The invention relates to a tool arrangement for machining the side surface of a wood-based panel with a carrier and with a means for pressing the carrier against the wood-based panel to be machined, the carrier having a first and a second carrier element which are connected by a joint and wherein the second carrier element Means for measuring the thickness of the wood-based panel, a tool and has means for centering the tool.

Machining the side surfaces of wood-based panels includes machining the edges. The edges of the side surfaces each adjoin an upper side or a lower side, that is to say the main surfaces of the wood-based panel. Insofar as the terms "vertical" and "horizontal" are used in connection with the invention, these always relate to the level which is predetermined by the wood-based panel. For the tool arrangement according to the invention, the fact is used that for the machining of the side surfaces of wood-based panels, including the edges, there is usually a fixed relationship between the panel thickness and the position of the edges, regardless of the other dimensions of the wood-based panel. In implementing this circumstance according to the invention, a mechanically centering tool arrangement is proposed.

A typical application is the removal of protruding coatings, e.g. B. of laminates that can be applied to the top and / or bottom of wood-based panels. Alternatively, the side surfaces can also be provided with a profile or smoothed. Below we explain the invention in particular using the example of removing such protruding coatings without, however, other processing of the side surfaces, for. B. smoothing or profiling. In relation to the typical application of removing protruding coating material, the tool arrangement according to the invention is expediently arranged directly behind a coating device, usually a short-cycle press. The tool arrangement according to the invention is ready for use if it is aligned vertically and horizontally such that the tool comes into engagement with the edge of the plate to be machined when the plate is guided past the tool. If two parallel edges of a plate are to be machined, two of the tool arrangements can be attached opposite one another.

An essential part of the tool arrangement according to the invention is the arrangement for determining the working position of the tool, which consists of two components, the means for detecting the plate thickness, which are vertically adjustable, and the means Press the tool against the wood-based panel to be machined, which are horizontally adjustable. The means for pressing the carrier — and thus the tool — onto the wood-based panel to be processed press the articulated second carrier element against the wood-based panel. The means for pressing can be designed as pneumatic, hydraulic or spring-loaded means, for. B. as a pneumatic or hydraulically operated piston or as a compression spring that presses the second carrier element - and thus also the tool - in the plane of the wood-based panel to the wood-based panel. The joint between the first and the second carrier element is preferably designed as a lever-joint arrangement. The means for pressing on and the means for detecting the thickness of the wood-based panel interact with the means for centering the tool and, depending on the thickness of the panel, align the tool in such a way that the side surface of the wood-based panel, in particular its edges, engages exactly the tool comes. As explained in more detail above, according to the inventor's knowledge, the working position of the tool is in a predetermined relation to the plate thickness. According to the invention, the means for centering are thus arranged in a predetermined relation to the means for detecting the plate thickness.

This is implemented according to the invention in that the means for detecting the plate thickness are designed as a pressure device in which a stationary pressure means interacts with a movable pressure means. The movable pressure means can be designed as a rotating pressure means or as a pivotable pressure means. The pressure means are each on a main surface of the wood-based panel to be processed. It is advantageous if the stationary pressure means rests on the underside of the wood-based panel and the movable pressure means rests on the top of the wood-based panel. The pressure means are designed as rotating rollers, rollers, balls or as a pivotable lever, which e.g. can cooperate with a rail as a fixed pressure element. Based on the processing direction of the wood-based panel, several pressure means are provided according to an advantageous embodiment of the invention, preferably both before and after the tool.

According to the invention, the stationary pressure means are mounted on an axis which is fastened to the carrier and around which the stationary pressure means rotate. On the axis is further attached according to the invention a movable lever which carries at its free end a further axis on which the movable pressure means is attached. This further axis on the lever is arranged parallel to the axis of the stationary pressure means. The movable pressure medium rotates around the other axis on the lever. The lever can be rotated about the axis of the stationary pressure means at least to such an extent that the movable pressure means can roll on the wood-based panels with the greatest thickness. Typical thicknesses of wood-based panels are between 5 mm and 60 mm, mostly between 8 mm and 50 mm. The plates to be machined deflect the movable pressure means in relation to the stationary pressure means and thereby cause the lever to deflect upwards or downwards. The means for detecting the thickness of the wood-based panel are therefore designed for a vertical movement, in particular a stepless vertical movement.

The centering means, which are part of the arrangement for determining the working position of the tool, carry a tool holder on which the tool is held in fixed relation to the centering means. The centering means also have a guide element with an end face on which the side face of the wood-based panel to be machined is guided. The guide element is pressed horizontally against the side surface of the wood-based panel by the pressing means which act on the second carrier element. The horizontal working position of the tool is defined by means of the end face or the position of the end face in relation to the tool. The guide element is in one piece according to a preferred embodiment of the invention, for. B. formed as a plate or rail, but it can also be in several parts, for. B. be composed of a sequence of roles. In this case, the end face is composed of the circumferential surface of the rollers. According to a preferred embodiment, the end face extends in the machining direction of the side face in front of and behind the tool.

The centering means according to the invention finally have a centering pin which is firmly connected to the guide element, either by being formed integrally with the guide element or by z. B. is rigidly connected to the guide element by welding or screwing. The centering pin is received with its first end in the lever of the means for detecting the plate thickness and is also in the Intervention with a ruler.

According to a first alternative, the guide ruler is fixed in place on the second carrier element and is only connected to the centering means via the centering bolt resting on the guide ruler. The guide ruler converts the vertical movement of the centering bolt into a horizontal movement when lifting or lowering the lever of the upper pressure elements, i.e. a movement on the wood-based panel to be machined or away from this wood-based panel.

The guide ruler is preferably designed as an inclined or curved guide ruler, an upper section of the guide ruler having a different distance from the side surface of the wood-based panel to be processed or the stationary pressure elements than a lower section of the guide ruler.

The upper section of the guide ruler is preferably arranged closer to the stationary pressure means, in particular if the upper pressure element is designed to be movable. The centering pin is raised or lowered with the lever. At the same time, the centering pin, which rests with its second end on the guide ruler, is deflected horizontally with respect to the height of the guide ruler, in a direction perpendicular to the machining direction of the wood-based panel. The processing direction is the direction in which the wood-based panel to be processed is conveyed past the tool arrangement. With the horizontal movement of the centering pin, the guide element and the tool are also moved horizontally and thereby change the position in relation to the side surface to be machined of the wood-based panel guided past the tool arrangement. In accordance with the changed thickness of the wood-based panel, the guide element, on the end face of which the wood-based panel rests with the side surface, and the tool are centered at a different distance from the wood-based panel. The tool arrangement according to the invention places the tool at an optimal distance from the side surface, in particular from the edges between the side surface and main surfaces of the wood-based panel. In this way, the machining of the side surface of wood-based panels of various different thicknesses is possible in a simple, robust and reliable manner, the tool arrangement according to the invention being self-adjusting and when the plate thickness is changed no interruption in production is required or the tool is readjusted got to. The specification of a to be created Side surface or edge, as is necessary according to the aforementioned prior art, is omitted in the tool arrangement of the invention.

According to a second, alternative embodiment of the invention, the guide ruler can be held displaceably in a mostly slot-shaped receptacle which is inclined in the direction of the wood-based panel to be processed. The centering pin is attached to the movably held guide ruler. The free end of the centering pin moves the second carrier element with the tool arranged thereon in a horizontal direction towards the wood-based panel to be processed when the upper pressure elements are raised, because when the upper pressure elements are lifted, the centering pin is also lifted. When the centering pin is raised, the guide ruler is also raised. Since the holder of the guide ruler is arranged obliquely with respect to the plane of the wood-based panel, the guide ruler and the centering bolt firmly attached to it move the tool towards the wood-based panel to be machined. When the upper pressure elements are lowered, the centering bolt attached to them is also lowered, and the guide ruler is correspondingly received in the recess. This moves the tool away from the wood-based panel to be processed.

The tool arrangement according to the invention can be used as a stand-alone arrangement, but it is typical to use it on a processing line on which a plurality of successive processing stations with different tools are arranged. Accordingly, the carrier of the tool arrangement, in particular the first carrier element, can be fastened to a wall piece, a support or another receptacle that is sufficiently stable to offer resistance to the forces. The carrier is usually made of metal, it can be in one part or in several parts. According to the invention, the carrier is at least in two parts. In this case, a first carrier element is fastened to the receptacle and a second carrier element is articulated, in particular connected to the first carrier element via a lever-joint arrangement. According to a further advantageous embodiment, a hydraulic or pneumatic piston arrangement or a spring element, for. B. a compression spring, arranged between the first and the second carrier element to press the second carrier element to the wood-based panel to be processed. By swiveling the lever as a result of the action of the means for pressing the second carrier element onto the side surface of a wood-based panel to be machined on a lever-joint arrangement, the second carrier element is displaced in the direction away from the first carrier element or towards the first carrier element. The second, movable carrier element is preferably only movable in the pressing direction, that is to say in a direction parallel to the plane of the wood-based panel to be processed. The second carrier element is preferably not adjustable in height or adjustable in the direction of movement of the wood-based panel.

The tool can be a fixed blade or a rotating tool, in particular a milling tool. The tool can be in one part or in several parts. The tool is fixed in place on the centering means. The tool is thus aligned by the centering means as a function of the respective thickness of the wood-based panel at the optimal distance from the side surface to be machined or the edges of the side surface of the wood-based panel. It is designed to machine the entire side surface or, preferably, to machine one or both edges of a side surface.

The tool is advantageously aligned in such a way that it creates a chamfer on the edge to be machined. For this purpose, the machining surface of the tool can be arranged at an angle which corresponds to the bevel of the chamfer to be produced. At the same time, a processing surface of the tool that is arranged obliquely in relation to the level of the wood-based panel is helpful if thinner or thicker wood-based panels are to be processed, the edges or side surfaces of which are located at different locations. If two edges of a side surface are to be machined, the use of a symmetrical, in particular spindle-shaped tool may be expedient, the machining surfaces of which are inclined so that they can machine the edges of thin and thick wood-based panels. Alternatively, several tools can also be arranged on the carrier, the processing surfaces of which are aligned in a staggered manner in order, for B. to edit the edges of wood panels of different thicknesses. A tool is particularly preferred which is designed in the manner of a diabolo, that is to say in the form of two cones standing on one another with the tip. The outer surface of both cones is designed to machine the side surface or the edges of a wood-based panel.

Fig. 1

eine Draufsicht auf eine erfindungsgemäße Werkzeuganordnung zum Bearbeiten einer Seitenfläche einer Holzwerkstoffplatte

Fig. 2

eine perspektivische Ansicht von vorn auf eine Werkzeuganordnung nach Fig. 1

Fig. 3

eine perspektivische Ansicht von unten auf eine Werkzeuganordnung nach Fig. 1

Fig. 4

eine Seitenansicht auf eine Werkzeugansicht nach Fig. 1

Details of the invention are explained in more detail below with reference to drawings. Show it:

Fig. 1

a plan view of a tool arrangement according to the invention for machining a side surface of a wood-based panel

Fig. 2

a perspective view from the front of a tool assembly Fig. 1

Fig. 3

a perspective view from below of a tool arrangement Fig. 1

Fig. 4

a side view of a tool view Fig. 1

Fig. 1 and Fig. 2 show a tool arrangement 2, here made of metal, for machining the side surface of a wood-based panel (not shown). The tool arrangement according to the invention has a carrier 4 and means for pressing the carrier 4 against the wood-based panel to be processed, the carrier 4 having a first and a second carrier element 4a, 4b, which are connected by a lever-joint arrangement 8, and the second carrier element 4b Has means 10 for detecting the thickness of the wood-based panel to be machined, a tool 12 for machining the side surface, here in particular the edges of the wood-based panel, and means 14 for centering the tool.

In the 1 to 4 The tool arrangement presented is designed to remove excess coating material on the upper and lower edges of coated or laminated wood-based panels with a thickness of 8 to 50 mm. For this purpose, it is arranged at the output of a short-cycle press. The carrier 4 is oriented in the vertical and horizontal directions so that the tool 12 comes into optimal engagement with the side surface of the wood-based panel to be processed. Details of the tool arrangement according to the invention and its mode of operation with optimum alignment with the wood-based panel to be processed are described in more detail below.

The carrier 4 has a first carrier element 4a, which is stationary in the operating state. This first carrier element 4a is connected to the second via a lever-joint arrangement 8 Carrier element 4b connected. The first support element 4a has a rectangular support plate 16, on the lateral sections 16a, 16b of which the lever-joint arrangement 8 is attached: hinge pins 20 are held on the support plate 16 by means of tabs 18. The hinge pins 20 are in engagement with the first end of pressure levers 22, which are in engagement with their second end with a support plate 24 of the second support element 4b. The second carrier element 4b is thus stably connected to the first carrier element 4a via a lever-joint arrangement and is pressed evenly in the direction of the wood-based material panel to be processed by the means for pressing against the wood-based panel.

The means for pressing are not shown here; typically hydraulic or pneumatic cylinders are used, which are fastened with a first end to the first carrier element 4a, here to the lever 6. With its second end, the hydraulic or pneumatic cylinder is fastened to the second carrier element 4b and thus presses the second carrier element in the direction of the arrow H ( Fig. 1 ) towards the plate to be processed. In order to exert uniform pressure on the second carrier element 4b, a plurality of pressing means can also be used, typically two or four hydraulic or pneumatic cylinders. The plate to be processed exerts a counter pressure against the pressing means when it passes the tool arrangement 2. The second carrier element 4b must be arranged so as to be movable in order to be optimally aligned between the pressure and counterpressure for machining the side surface of the wood-based panel. This is ensured by the lever-joint arrangement 8 described above.

The dimensions of the pressure levers 22 allow - based on the level of the wood-based panel to be machined - a horizontal movement according to arrow H ( Fig. 1 ), which makes it possible to machine wood-based panels with a thickness of 8 mm to 50 mm with an optimally positioned tool 12. A movement in the vertical direction is excluded while machining the side surface of a wood-based panel.

The second carrier element 4b is like Fig. 3 can essentially be seen from the carrier plate 24, the connecting plates 26 attached to the carrier plate, here the lateral sections 24a, 24b of the carrier plate 24, and the base plate 28. The second carrier element 24 is thus a sufficiently rigid arrangement that the tool 12 and the means 14 for centering and the means 10 for detecting the thickness of the respective wood-based panel to be processed.

The means for detecting the thickness of the wood-based panel are designed as pressure means 10 in the present case. The pressure means 10 are composed of at least two, typically four to ten, in the machining direction of the wood-based panel according to arrow B ( Fig. 1 . 2 ) arranged one behind the other, in the vertical direction stationary rollers 30a, 30b, which are connected by support bolts 32a, 32b to the base plate 28 and are additionally stabilized by a rail 34. At least two, typically four to ten, movable pressure rollers 36a, 36b are arranged above the stationary rollers 30a, 30b. The upper, movable pressure rollers 36a, 36b are fastened to the supporting bolts 32a, 32b by means of levers 38a, 38b. The levers 38a, 38b are attached to the support bolts at a first end, and at a second end they engage with bolts 40a, 40b which carry the upper pressure rollers 36a, 36b. The levers have a length that permits vertical movement of the movable upper pressure rollers 36a, 36b over a distance that corresponds at least to the thickest wood-based panel to be processed. The upper pressure rollers are connected by a rail 42 which is bent vertically in the machining direction B at the front end 44 at an angle of approximately 45 ° and in the area of the upper pressure roller 36a on a plane parallel to the wood-based panel to be processed, but above the wood-based panel lowers. The rail 42 supports the feeding of a new wood-based panel, in particular a wood-based panel of greater thickness, and the vertical movement, here an upward movement, of the upper pressure rollers 36a, 36b.

The means 14 for centering the tool ensure that the tool 12 is always optimally engaged with the side surface of the wood-based panel to be processed, in particular here with the edges of the side surfaces. The centering means 14 comprise centering bolts 46a, 46b, the first end of which is received at a predetermined height in the levers 38a, 38b. The centering bolts 46a, 46b extend parallel and to the support bolts 32a, 32b and to the bolts 40a, 40b. A guide plate 48 is attached to the centering bolts 46a, 46b or between the support bolts (32a, 32b, 40a, 40b) and is arranged in one plane with the wood-based panel to be machined. The centering bolts 46a, 46b and the guide plate 48 are preferably permanently connected to one another. The Guide plate 48 can also be designed as a strip or as a row of rollers, but for reasons of stability, a guide plate 48 is preferred which extends in the machining direction B before, behind and after the tool 12. The centering bolts 46a, 46b always align the guide plate 48 as a function of the thickness of the wood-based panel to be machined at the level of the center line, that is, halfway up the wood-based panel. The end face of the guide plate 48 lies against the side surface of the wood-based panel to be processed and, in cooperation with the pressing means, ensures that the tool arrangement rests on the side surface of the wood-based panel with a predetermined pressure.

The centering bolts 46a, 46b also carry a support 52, which is attached with a bridge-like end to a centering bolt. The support 52 carries the tool 12 including the drive. The tool 12 is thus raised or lowered together with the guide plate 48, which is attached at the middle height of the tool, in a fixed, predetermined relationship to the vertical movement of the levers 38a, 38b. The support 52 attached to the centering bolts 46a, 46b and the guide plate 48 thus work together in order to optimally adjust the tool 12 for machining the side surfaces of the wood-based panel, here the edges.

In the case of wood-based panels of different thicknesses, the edges that are to be processed here lie at different distances from the average height of the wooden-based panel. Accordingly, the tool 12 must be aligned at a different distance from the average height, which is to be equated with the position of the guide plate 48, depending on whether the edges of a thin wood-based panel of e.g. B. 8 mm, of wood-based panels of medium thickness of z. B. 16 mm to 20 mm or wood-based panels of 40 mm or 50 mm thickness are to be processed. In order to ensure the optimal distance of the tool 12 from the edge to be machined in each case, a horizontal movement of the tool 12 is necessary. This horizontal movement is ensured by a guide, in which the 1 to 4 in an embodiment according to the invention shown centering bolts 46a, 46b, which are moved vertically by the levers 38a, 38b, are in engagement with a guide ruler 54 at their second end, in that the centering bolts abut the guide ruler. According to a preferred embodiment, the guide ruler 54 is shown in FIGS 1 to 4 shown execution formed as an inclined surface, the lower edge 56 is closer to the first support member 4a and the upper edge 58 closer to the tool 12. In the case of a vertical movement from bottom to top, which is triggered by the feeding of a wood-based panel with a greater thickness, the centering bolts 46a, 46b are raised by the pivoting of the levers 38a, 38b. The second end of the centering bolts slides upwards on the guide ruler 54 and the centering bolts 46a, 46b move in the direction H, which is predetermined by the plane of the wood-based panel to be processed. The upper pressure rollers 36a, the guide plate 48 and the tool 12 are horizontally displaced in the direction of the wood-based panel to be processed. This ensures that the tool 12 is centered in an optimal position on the edges of the side surface of the wood-based panel to be machined.

After the in the 1 to 4 The preferred embodiment shown is the tool 12 for removing excess coating material such as e.g. B. overlay or decorative paper. The requirement is to create a chamfer at the edges of the wood-based panel to be processed, i.e. at the transitions from the top and bottom to the side surface, i.e. a narrow, sloping surface instead of the simple edge. For this purpose, the tool 12 is advantageously designed in the manner of a diabolo, that is to say in the form of two cones standing one on top of the other, the guide plate 48 being arranged at the narrowest point of the diabolo, ie where the tips of the cones meet. The working surface of the tool 12 is thus inclined to the level of the side surface and the top and bottom of the wood-based panel to be machined and is simultaneously designed to machine the edges of wood-based panels of different thicknesses. The tool is advantageously a spindle-shaped milling machine, but can also be an obliquely or spindle-shaped knife. If only one edge of the wood-based panel is to be processed, the tool can only be arranged in the area of the edge to be processed.

The special advantage of in the 1 to 4 Tool arrangement 2 shown is that even little brittle protruding coating material or multi-layer coating material can be reliably and cleanly removed in one work step, forming a chamfer at the transition from the side surface to the top and / or to the bottom. The tool arrangement 2 sets itself automatically through a mechanical arrangement to different thicknesses of the wood-based panels without a predetermined contour being machined or without a separate control being required.

• Zuführen einer Holzwerkstoffplatte zu der Vorrichtung zum Bearbeiten der Seitenfläche
• Anpressen des Trägers an die Seitenfläche der Holzwerkstoffplatte,
• Erfassen der Plattendicke mittels der Mittel zum Erfassen der Plattendicke, Zentrieren des Werkzeugs bezogen auf die Holzwerkstoffplatte durch die Mittel zum Zentrieren, die in vorgegebener Relation zu den Mitteln zum Erfassen der Plattendicke angeordnet sind und
• Bearbeiten der Seitenfläche der Holzwerkstoffplatte durch das Werkzeug.

The machining of the side surface of wood-based panels, that is to say the production of chamfers on the edges, is carried out by automatically changing and adjusting the position of the tool 12 with the aid of means 14 for centering the tool 12. Using the device described above, the machining of the Side surface of a wood-based panel as follows:

• Feeding a wood-based panel to the device for processing the side surface
• Pressing the carrier against the side surface of the wood-based panel,
• Detecting the plate thickness by means of the means for detecting the plate thickness, centering the tool with respect to the wood-based panel by the means for centering, which are arranged in a predetermined relation to the means for detecting the plate thickness and
• Machining the side surface of the wood-based panel by the tool.

With an execution according to 1 to 4 is a wood-based board z. B. brought up to the tool assembly 2 via a roller conveyor, not shown. The bottom of the wood-based panel comes into engagement with the lower, stationary pressure rollers 30a and with the top with the front end 44 of the rail 42, which opens at an angle of approximately 45 ° upwards. The front end 44 of the rail 42 lifts the upper pressure rollers so far that the upper, movable pressure rollers 36a abut and roll on the top of the wood-based panel. If the wood-based panel is conveyed further in the processing direction, the lower and upper pressure rollers 30b and 36b also come into contact with the underside and the top of the wood-based panel and roll on the wood-based panel.

When the upper, movable pressure rollers 36a, 36b are raised, the levers 38a and 38b are deflected upward. Together with the levers 38a, 38b, the centering bolts 46a, 46b arranged in the levers are raised in a fixed relation to the vertical stroke of the upper pressure rollers. The on the centering bolts 46a, 46b attached guide plate 48 and support 52 are raised with the centering bolts. As a result, the guide plate 48 lies halfway up the side surface of the wood-based panel and, together with the pressing means, causes the tool 12 to bear tightly against the side surface or the edges of the wood-based panel. The tool 12 is set to the correct, predetermined height based on the thickness of the wood-based panel. So that the tool comes into exact engagement with the edges or the protruding coating material to be removed, it is necessary that the centering bolts 46a, 46b slide upwards on the guide ruler 54. The vertical movement is now converted into a horizontal movement and the tool 12 is moved by the means 14 for centering on the wood material board up to the correct distance from the side surface of the wood material plate. The tool 12 is thus correctly centered in terms of height and distance and produces a clean bevel on the edges when it engages with the wood-based panel.

So that the tool 12 can produce a clean chamfer, the carrier 4 is designed in the direction B of the machining to be sufficiently long that the means 10 for detecting the thickness and the means 14 for centering are arranged both before and after the tool 12 in a uniform manner To ensure raising or lowering and a uniform horizontal centering of the tool 12 in relation to the side surface to be machined.

Claims (9)

1. A tool assembly for machining the lateral surface of a composite wood board, comprising a support (4) and a means for pressing the support against the composite wood board to be machined, the support (4) comprising a first and a second support element (4a, 4b) that are connected by means of a joint (8) and the second support element (4b) comprising means (10) for detecting the thickness of the composite wood board, a tool (12) and means (14) for centering the tool, the means (10) for detecting the thickness of the composite wood board being designed as a pressure device comprising at least one immovable (30a, 30b) and at least one vertically movable pressure element (36a, 36b), the pressure elements being fastened on an axle formed on the support (4), the movable pressure element (36a, 36b) being fastened to the axle by means of a lever (38), characterized in that the means (14) for centering comprise a guide element (48) and a centering pin (46), a first end of the centering pin being connected to the lever (38) of the movable pressure element (36) and a second end of the centering pin (46) being engaged with a guide rule attached to the second support element (4b) and the centering pin (46) being rigidly connected to the guide element (48).
2. The tool assembly according to claim 1, characterized in that the means (10) for detecting the thickness of the composite wood board are designed as rotating or pivotable means.
3. The tool assembly according to one of the preceding claims 1 or 2, characterized in that the pressure elements (30a, 30b, 36a, 36b) are designed as rolls, balls or rollers or as levers or rails.
4. The tool assembly according to one of claims 1 to 3, characterized in that the guide rule (54) is designed to be inclined or bent.
5. The tool assembly according to at least one of the preceding claims 1 to 4, characterized in that the tool (12) is designed as a stationary blade or a rotating tool.
6. The tool assembly according to at least one of claims 1 to 5, characterized in that the tool (12) is designed to machine the edges of the lateral surface, which respectively adjoin the upper or lower face of the composite wood board.
7. A method for machining the lateral surface of a composite wood board by means of a tool assembly (2) comprising a support (4), said support comprising a first and a second support element (4a, 4b) that are interconnected by means of a joint (8) and comprising means for pressing the support (4) against the composite wood board to be machined, the second support element (4b) comprising means (10) for detecting the board thickness, a tool (12) and means (14) for centering the tool, the means (10) for detecting the thickness of the composite wood board being designed as a pressure device comprising at least one immovable (30a, 30b) and at least one vertically movable pressure element (36a, 36b), the pressure elements being fastened on an axle formed on the support (4), the movable pressure element (36) being fastened to the axle by means of a lever (38), characterized in that the means (14) for centering comprise a guide element (48) and a centering pin (46), a first end of the centering pin (46) being connected to the lever (38) of the movable pressure element (36) and a second end of the centering pin (46) being engaged with a guide rule (54) attached to the second support element (4b) and the centering pin (46) being rigidly connected to the guide element (48),
   said method comprising the steps of
   feeding a composite wood board to the tool assembly (2) for machining the lateral surface,
   pressing the support (4) against the lateral surface of the composite wood board,
   detecting the board thickness by means of the means (10) for detecting the board thickness,
   centering the tool relative to the composite wood board by means of the means (14) for centering, which are arranged in a predetermined relation to the means (10) for detecting the board thickness, and
   machining the lateral surface of the composite wood board by means of the tool (12).
8. The method according to claim 7, characterized in that the composite wood board is fed to means (10) for detecting the board thickness, which means rest on an upper face and a lower face of the composite wood board as pressure elements (30a, 30b, 36a, 36b).
9. The method according to claim 8, wherein lower pressure elements (30a, 30b), which rest on the lower face of the composite wood board, are immovable, and wherein upper pressure elements (36a, 36b), which rest on the upper face of the composite wood board, are movable.

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