EP1147867B1 - Method for cutting up panels or the like - Google Patents

Abstract

The method of cutting panels involves the decorative layer (3) deviating in breadth and or length after being applied to the wood fiber plate (6). At least one plate-cutting unit incorporates a saw consisting of adjustable saw-blades spaced out parallel with each other. The wood fiber plate is aligned in relation to at least one camera, with a second camera. The actual and desired positions between points are compared and the deviation noted.

Description

The invention relates to a method for cutting panels or the like from one with in particular substantially made of paper existing decorative layer provided fiberboard, wherein the width and / or length of the decorative layer after the Application to the fiberboard deviates from its origin, by means of a plate-cutting machine having at least one saw, wherein the saw is formed by a plurality, in parallel Distance between adjustable saw blades.

The panels are used, for example, as flooring, in particular laminate flooring used. The desired decor (parquet, wood grain, Tiles, etc.) is printed on a paper web, the then coated with synthetic resin and rolled up on a roll becomes. The pre-fabricated decor sheet is then included applied to the soil manufacturer on wood fiber boards. By the Printing the decoration on the paper web, the subsequent sealing the paper web with synthetic resin and the subsequent by pressure and Temperature Connecting the decorative layer with a wood fiber board the paper web changes in size. The expert speaks of the paper growing. The paper grows in both the length (length growth) and in the width (width growth). When this decorative panel is now cut to individual panels should take into account the length and width growth Otherwise, there will be an uneven decor distribution the individual panels would be present. This would mean that the composite of an unevenly distributed decorative layer Floor at the connecting edges of the panels Dekorsprünge has. Even if such decoration jumps are only a few millimeters, they stand out when looking at what the aesthetic Impression negatively influenced and thus the quality of the laid out Floor reduces.

In order to produce quality, paper growth must be recorded and set the saw accordingly. Because this is manual happens, it is very time consuming and therefore costly. If the measure is not determined correctly, the risk becomes immediate Committee to produce, quite high. Especially if as a decor grouted tiles are already printed, there are already slight deviations individual panels in the decor at the joints approaches recognizable. A Deviation of only 2 mm would be no longer tolerable, because this already bring a complete offset of the fugue with it could. So it must be permanently adjusted the saw, which appropriately trained panels much more expensive.

Starting from this problem, the cropping is under Consideration of paper growth to be automated.

• die Holzfaserplatte wird gegenüber einer ersten Kamera ausgerichtet,
• über die erste Kamera und eine zweite Kamera wird je ein definiert vorgegebener Punkt auf der Dekorschicht erfasst,
• der Abstand zwischen den Punkten wird ermittelt,
• durch Vergleich der Istlage mit der Solllage der Punkte wird die Abweichung des Breiten- oder Längenmaßes ermittelt,
• das Maß der ermittelten Abweichung A wird ins Verhältnis zur Anzahl n der Sägeblätter gesetzt und
• der parallele Abstand der Sägeblätter zueinander wird um das Maß des Verhältnisses der Abweichung zur Anzahl der Sägeblätter A/n verändert,
• die Ausrichtung der Holzfaserplatte zur Säge relativ zueinander wird um die Hälfte der ermittelten Abweichung zu einer Seite versetzt, und anschließend
• wird die Holzfaserplatte zum Ausschneiden der Paneele in Richtung der Säge transportiert.

The problem is solved by a procedure with the following steps:

• the fiberboard is aligned with a first camera,
• via the first camera and a second camera, a defined predetermined point is detected on the decorative layer,
• the distance between the points is determined
• by comparing the actual position with the desired position of the points, the deviation of the latitude or longitude is determined,
• the measure of the determined deviation A is set in relation to the number n of the saw blades and
• the parallel distance of the saw blades to each other is changed by the degree of the ratio of the deviation to the number of saw blades A / n,
• the orientation of the fiberboard to the saw relative to each other is offset by half of the determined deviation to one side, and then
• The fiberboard is transported to cut out the panels in the direction of the saw.

Rather than the measure of the determined deviation in relation to the number to set the saw blades and then the parallel distance Alternatively, the determined distance between the points (actual size) are compared to the number of Saw blades and then the parallel distance of the saw blades to each other on the measure of the ratio of distance to the number of saw blades (L / n) can be set.

With these methods it is possible to automatically increase paper growth to capture or determine and the data obtained without further interposition of a mental and thus in principle an activity subject to error the attitude the saw and the positioning of the wooden plate in front of the saw make. As there is always a reproducible setting, the quality of the corresponding sawn-in panels is very high large. Even difficult decors, such as tile decors, can be processed with high quality and at low cost.

If defined via a third camera another predetermined Point is detected and here the actual position with the desired position of At the same time the growth in the be determined in another direction. According to the determined data then both the longitudinal saw and the cross saw are adjusted and the wooden plate at half the offset to the saw shifted in one direction, with the offset, so the growth in length and in width does not have to be identical, so that Even complicated behavior becomes manageable. Instead of the It is detect camera defined points in the decorative layer also possible to attach markings on the paper web at the edge, which are detected via the cameras. With this measure can the method according to the invention can also be used when a little contrast rich decor is given.

Preferably, the determined deviation is with a tolerance allowance stored. The first, as described above, measured plate subsequent subsequent plates are compared aligned with the first camera and then the deviation of the latitude and / or measure of length determined. The deviation thus determined is the sum of the deviation of the first plate plus compared to the tolerance addition and only if the deviation the following plate is larger than the first plate plus is the tolerance range, there is a renewed adjustment of the saw blades and relocating the wood fiber board around the Half of the deviation, or setting the saw to the appropriate Measure.

By this measure, the tolerance can be customized to the given Decor be adapted, which allows the production immediately to the required or acceptable quality standard. Thus, in a tile decor, the tolerance range becomes essential must be chosen smaller than a Spundbodendekor or a veneer decor. The saw blades can work on a common Be arranged wave. Also, it is possible to saw the saw out individually driven saw blades, which are adjusted to each other in the distance be able to form.

Figur 1 -

die schematische Draufsicht auf eine mit einer Dekorschicht versehenen Platte;

Figur 2a-

eine Platte mit optimalem Wachstum der Dekorschicht;

Figur 2b-

eine Platte mit optimalem Wachstum der Dekorschicht;

Figur 2c-

eine Platte mit zu großem Wachstum der Dekorschicht ohne versetztem Trennschnitt;

Figur 2d-

eine Platte mit zu großem Wachstum der Dekorschicht mit versetztem Trennschnitt;

Figur 3 -

die schematische Draufsicht auf eine Plattenaufteilanlage.

With the help of a drawing, an embodiment of the method according to the invention will be explained in more detail below. It shows:

FIG. 1 -

the schematic plan view of a provided with a decorative layer plate;

Figure 2a

a plate with optimum growth of the decorative layer;

Figure 2b-

a plate with optimum growth of the decorative layer;

Figure 2c

a plate with too much growth of the decorative layer without offset separating cut;

FIG. 2d

a plate with too large growth of the decorative layer with offset separating cut;

FIG. 3 -

the schematic plan view of a Plattenaufteilanlage.

Figure 3 shows a Plattenaufteilanlage, which is provided with a roller conveyor 5, on which the provided with a decorative layer 3 wood fiber plate 6 can be placed. The Plattenaufteilanlage is provided with a saw 1, which consists of a plurality of mutually parallel spaced saw blades S ₁ , S ₂ , S ₃ , S ₄ , S ₅ , S ₆ . The saw blades S _n are spaced from each other at a distance a. They can be connected individually or on a common shaft 2. With the saw 1 shown here, the wood fiber board 6 could be split in the longitudinal direction. To divide the wood fiber plate 6 in the transverse direction, a cross-saw, not shown here is arranged offset by 90 °. After a wood fiber board 6 has been divided in the longitudinal and transverse directions, the individual panels are fed to the profiling of a milling device, which is not shown here.

Before the saw 1 5 three cameras 4a, 4b, 4c are arranged above the roller conveyor. In the decor 3 defined points P ₁ , P ₂ , P _{3 are} given, which can be detected by the cameras 4a, 4b, 4c. Instead of dots in the decor, markings (eg dashes) may be applied to the edge that can be detected by the cameras. The actual position of the points P ₁ , P ₂ , P ₃ to each other or the desired position of the markings to each other is stored in a computer 7, which is operatively connected both to the cameras 4 a, 4 b, 4 c and with a setting device of the saw 1, not shown here is.

A provided with a decor 3 wooden plate 6 is placed on the roller conveyor 5 in front of the saw 1 and connected to a transport device not shown here. The transport device is movable in the longitudinal and transverse directions and via it the plate 6 is aligned with respect to the camera 4a until the defined predetermined point P _{1 is} detected by the camera _{4 a} . The point P ₁ is used to calibrate the system and should specify the desired position. Via the camera 4b the actual position of the point P ₂ and via the camera 4c the actual position of the point P _{3 is} detected.

In the computer 7, the deviation A between the stored desired position and the detected actual position is determined. This determination is made both in the longitudinal direction (P ₁ / 4a-P ₂ / 4b) and in the transverse direction (P ₁ / 4a-P ₃ / 4c). The calculated deviation A is divided by the number n of the saw blades S ₁ , S ₂ , .... S _n . Then, the saw 1 is controlled by the computer 7 so that the parallel distance a of the individual saw blades S ₁ , S ₂ , ... S _n to each other by the dimension A / n is increased. In the exemplary embodiment, the saw 1 is provided with six saw blades, so that the same parallel distance a between the individual saw blades S _{n is} increased by 1/6 A each.

Although the growth in the longitudinal or transverse direction of the paper layer is uniform, it can only be detected on one side. A comparison of Figures 2a and 2b shows that the relative position of the point P _{1 is} unchanged, while the point P ₃ by the dimension A further outward (in the drawing to the right) has migrated.

Figure 1 illustrates how the saw blades S ₁ ... S ₆ are displaced parallel and evenly spaced with the distance a + A / 6 are set. As FIG. 2 c shows, the points P ₁ and P ₃ are equidistantly spaced from the respective edge of the fibreboard 6. Thus, the cut panels can be profiled later with tongue and groove, it is known to be necessary to perform a separating cut, which can be performed on the spring side in a smaller width than on the groove side. If the arrangement of the wood fiber board 6 shown in FIG. 1 were to be maintained in front of the saw 1, the panels would later have an offset since they have to be fed to a profiling in the corresponding machine. This stop the formatting is marked in Figure 2 with X. In order to compensate for this offset, the wood fiber board 6 is then again shifted by half of the offset A relative to the saw 1 to one side (see Figures 2b and 2c). Analogously, of course, the parallel arrangement of the saw blades S ₁ ... S ₆ and the saw 1 are offset by the dimension A / 2. Then, the wood fiber plate 6 is transported in the direction of the saw 1, where the longitudinal division takes place.

Subsequently, in not shown here form but in the same way, the wood fiber plate 6 fed to a cross-cutting unit, the cross saw then arranged at right angles to the saw 1 is and the growth of the decorative layer in the longitudinal direction is taken into account analogously to the above. About the Separating cuts 8, the panels in the longitudinal or transverse direction the fiberboard 6 cut out.

The panel splitter is adapted to the deviation A of the length and width growth of the first panel by the method described above. By irregularities in the paper web or the use of a new role Decor naturally changes the paper growth to be considered. For this purpose, the first stored deviation A is stored in the computer 7 and provided with a tolerance allowance T. Each subsequent wood fiber plate 6 is aligned according to the first wood fiber plate 6 in front of the saw 1 and determines the actual position of the points P ₁ , P ₂ , P ₃ . The deviation A _i thus determined from the desired position is compared to the stored original deviation A plus the tolerance range T and the panel splitter or the settings of the saw and the offset of the wood fiber board 6 to saw only changed if the condition A i > A + T is satisfied, where i determines the next respective disk (2, 3, 4 .... i, ... n). The tolerance allowance T is determined by the quality specification, that is, which offset can be accepted in the decor.

LIST OF REFERENCE NUMBERS

1

saw

2

wave

3

decor

4a

camera

4b

camera

4c

camera

5

roller conveyor

6

Fiberboard

7

computer

a

distance

A

Deviation / growth

L

Distance (actual size)

n

Number of saw blades

P ₁

defined point

P ₂

defined point

P ₃

defined point

S

sawblade

X

Location of the formatting stop

Claims (6)

1. Method for cutting up panels or the like of a wood fibreboard (6) provided with a decorative layer (3) consisting substantially in particular of paper, the width and/or length dimension of the decorative layer (3) differing from its original following the application to the wood fibreboard (6), by means of at least one board dividing installation having a saw (1), the saw (1) being formed by a plurality of adjustable saw blades (S₁, S₂,...S_n) arranged with a parallel spacing from one another, characterized by the following steps:

   the wood fibreboard (6) is aligned with respect to at least a first camera (4a),

   via the first camera (4a) and a second camera (4b), in each case a predefined point (P₁, P₂) in the decorative layer (3) is registered,

   the distance (L) between the points (P₁ and P₂) is determined,

   by comparing the actual position with the desired position of the points (P₁ and P₂), the deviation of the width or length dimension is determined,

   the amount of the deviation (A) determined is related to the number (n) of saw blades (S_n), and

   the parallel spacing (a) of the saw blades (S_n) from one another is changed by the amount of the ratio of the deviation to the number of saw blades (A/n),

   the alignment of the wood fibreboard (6) and the saw (1) relative to each other is offset to one side by half the deviation (A) determined, and then

   the wood fibreboard (6) is transported in the direction of the saw (1) in order to cut out the panels.
2. Method for cutting up panels or the like of a wood fibreboard (6) provided with a decorative layer (3) consisting substantially in particular of paper, the width and/or length dimension of the decorative layer (3) differing from its original following the application to the wooden fibreboard (6), by means of at least one board dividing installation having a saw (1), the saw (1) being formed by a plurality of adjustable saw blades (S₁, S₂,...S_n) arranged with a parallel spacing from one another, characterized by the following steps:

   the wood fibreboard (6) is aligned with respect to at least a first camera (4a),

   via the first camera (4a) and a second camera (4b), in each case a predefined point (P₁, P₂) in the decorative layer (3) is registered,

   the distance (L) between the points (P₁ and P₂) is determined,

   by comparing the actual position with the desired position of the points (P₁ and P₂), the deviation of the width or length dimension is determined,

   the spacing (L) is related to the number (n) of the saw blades (S_n), and

   the parallel spacing of the saw blades is adjusted to the amount of the ratio of the distance to the number of saw blades (L/n),

   the alignment of the wood fibreboard (6) and the saw (1) relative to each other is offset to one side by half the deviation (A) determined, and then

   the wood fibreboard (6) is transported in the direction of the saw (1) in order to cut out the panels.
3. Method according to Claim 1 or 2, characterized in that

   via a third camera (4c), a further predefined point (P₃) is registered,

   the distance between the points (P₁ and P₃) is determined,

   by comparing the actual position with the desired position of the points (P₁, P₃), the deviation of the other one of the width or length dimensions is determined.
4. Method according to Claim 1, 2 or 3, characterized in that instead of defined points, markings applied at the edge in the decorative layer (3) are detected.
5. Method according to Claim 1, characterized in that the saw blades (S_n) are arranged on a common shaft (2).
6. Method according to one of the preceding claims, characterized in that

   the deviation (A) determined, plus a tolerance band (T), is stored,

   the wood fibreboards (6) following a first wood fibreboard (6) are aligned with respect to the first camera (4a),

   the deviation (A_i) of the width and/or length dimension is determined,

   the deviation (A_i) is compared with the sum of the deviation (A) and the tolerance band (T), and

   the parallel spacing of the saw blades (S_n) is readjusted if the deviation (A_i) is greater than the sum of the deviation (A) and the tolerance band (T).

Images