EP1749627B1 - Apparatus and method for manufacturing veneer panels - Google Patents

Abstract

Device for producing veneer boards comprises an aligning table (14, 24) for aligning support plates (3) and veneers (11, 21) using stops which are distributed over the table surface. An independent claim is also included for a method for producing veneer boards using the above device. Preferred Features: The stops can be moved fro an inactive resting position below or above the table surface into an active stop position so that they contact the longitudinal and/or transversal edges of the veneers or support plates.

Description

The invention relates to an apparatus and a method for producing veneered panels.

The term "veneer" in the present application, both wood veneers and decorative films, Gegenzugpapiere and the like understood.

By the DE 198 32 534 It is already known to supply a carrier plate by a carriage of the veneer station. The storage of the carrier plate on the veneer is done by stripping the carrier plate from the carriage by a stop. This stop is set in such a way that the plate is placed precisely on the veneer. The orientation of the veneer can be done manually, but expediently by stops in the longitudinal direction, with which the veneer comes during transport in Appendix and by stops in the transverse direction, which define the final position of the veneer in the veneer station. The transport of the veneer takes place by rolling or the like.

Moreover, by the DE 103 29 422 a device and a method for producing veneered panels known. The veneers are aligned on a first transport path by a peripheral stop bar in the longitudinal direction and then aligned on a second transport path by a plurality of individually activatable attacks in the transverse direction. The structural design of these attacks is not shown in detail.

Comparable is also still the DE 20 2004 001308 U1 that works similarly.

The present invention is based on the following problems: The veneers are usually prepared ready in the form of a stack, wherein in each case the uppermost veneer has to be separated and transported to the veneer station. The veneers whose dimensions are only slightly larger than those of the carrier plates to be coated, ie the furniture parts are stacked with an accuracy of about +/- 5 mm lateral offset. They are therefore also supplied with this tolerance of the veneer station.

With the present invention, a more precise positioning of the veneers - alternatively also the support plates - is now to be achieved, so that the supernatant of the veneers on the support plate can be chosen less than previously possible.

At the same time, the present invention is intended to allow a higher capacity utilization of the veneer press by allowing a plurality of small plates to be simultaneously veneered in the press.

This object is achieved with respect to the device features according to the invention by the features of claim 1.

This results in the advantage that a large number of veneers, but alternatively also of carrier plates, can be aligned very precisely at the same time. So it is a full occupancy of the press possible because not only the parts lying on the edge are aligned, but also in the middle press area parts can be placed and aligned. You can thereby exploit the maximum press width or length. The cycle time of the press remains unchanged, because it does not matter if the press presses only a few parts on the long sides or if it is fully occupied.

The constructive design of the grid-like distributed over the table surface attacks done in such a way that they are adjustable from an inactive rest position below or at a distance above the table surface in an active stop position in which they with the longitudinal and / or transverse edges of the veneers or the Carrier plates come into contact. Only the one becomes Activated stops, which lie on the longitudinal or transverse edges of the veneers or support plates, while the remaining stops remain in their rest position. The selection of the attacks to be activated can take place automatically on the basis of the given laying pattern. This laying pattern can either be programmed in or, if the carrier plates are already in a laying pattern ready to be detected by a camera and passed to the control of the attacks. - In practice, the part dimensions are entered into the controller. From this input, the controller calculates how many parts fit longitudinally and transversely into the press and how the parts are best arranged, ie distributed in the available pressing surface. The controller then activates the corresponding stops; At the same time, it can also calculate the hydraulic pressure for the individual press cylinders of the press.

Conveniently, the stops are mounted below the table surface and the table surface has a plurality of openings through which the stops can be adjusted to their active stop position upwards.

With regard to the method, the object is achieved by the features of claim 7. As a result, the resting parts are reliably aligned, i. moved to their desired position.

Preferably, the relative movement is generated by a displacement of the table surface, so that the attacks can remain stationary together with their storage and their activation mechanism. For this purpose, the openings that allow the individual startup of the attacks to be activated, slit-like arranged in the direction of said relative movement.

Basically, there are various possibilities to realize the relative movement between the table surface and the attacks. In most cases, it is best to divide the movement in the longitudinal and transverse directions, but both movements can overlap quite well. Appropriately, the alignment on the narrow sides of the parts is started and then the long sides are pressed against the activated stops. However, it is well within the scope of the invention to realize the relative movement in a direction oblique to the longitudinal and transverse directions.

According to a particularly advantageous development of the alignment process according to the invention is limited to the veneers, whereas the support plates are aligned in a conventional manner during their transport or during the transfer. This has the advantage that the relative movement for the alignment process can take place much faster because the veneers are significantly lighter than the carrier plates.

In this context, it may be appropriate to connect the alignment table to a vacuum system so that the veneers are sucked to the table surface and can not accidentally slip.

Figur 1

eine schematische Ansicht von oben auf die Furnieranlage;

Figur 2

eine Ansicht von oben auf den Ausrichttisch mit nicht ausgerichteten Furnieren;

Figur 3

die gleiche Ansicht wie Figur 2, jedoch nach Ausrichtung der Furniere;

Figur 4

einen Vertikalschnitt durch die Tischfläche des Ausrichttisches bei unterschiedlicher Belegung.

Further features and advantages of the invention will become apparent from the dependent claims, from the following description of an embodiment and from the drawing. It shows

FIG. 1

a schematic view from above of the veneer plant;

FIG. 2

a top view of the alignment table with non-aligned veneers;

FIG. 3

the same view as FIG. 2 but after alignment of the veneers;

FIG. 4

a vertical section through the table surface of the alignment table with different occupancy.

The veneer system shown begins with a transport path 1, which is occupied by two feeders 2 arranged on carrier plates 3 on both sides. The transport path 1 is realized in the form of a Ausrichtrollenbahn, so that the adjacent support plates 3 are aligned along a running in the direction of transport stop 4. Then the carrier plates pass a brushing machine 5 and a glue application machine 6. The underside and top side glued carrier plates can then be buffered on a knife disk web 7 before they are placed on a further knife disk web 8 by stops in the longitudinal direction, ie in the transport direction in certain desired positions. The support plates 3 are aligned in a row one behind the other with a predetermined distance, the positioning so It is chosen that the width of the coating press, where veneering takes place later, good exploits.

Subsequently, a transfer device 9 transports the entire product row lying on the knife disk web 8 - transverse to the transport direction of the knife disk web 8 - onto a laying belt 10, more precisely to lower webs 11 already deposited there. These underfoams lie there with the same laying pattern next to one another, like the carrier plates 3 on the knife disk track 8, so that the carrier plates can be placed faithfully on the lower veneers 11.

The alignment and positioning of the lower veneers 11 will be described in more detail below:

It can be seen laterally next to the laying belt 10, a tapered roller conveyor 12, on which several stacks of lower veneers 11 lie. Although these veneer stacks are aligned on a longitudinal direction to the transport direction of the inclined roller conveyor stop bar and in the transverse direction by stops; but this is a coarse alignment, because the veneers are not exactly on top of each other within their respective stack. For a more accurate alignment, the uppermost layer of a row of veneers is removed from the respective veneer stack by means of a vacuum drawing strip 13 and deposited on an alignment table 14. There the exact alignment and positioning of the veneers takes place.

Further details of the alignment table will be apparent from the following figures.

FIG. 2 shows that the top of the alignment table 14 has a plurality of raster-like distributed over the table surface recesses 14a. These recesses have in the top two alternatives of FIG. 2 each in the form of a right angle, one leg of which extends in the longitudinal direction, the other leg in the transverse direction of the Legetisches, whereas in the third alternative shown below of FIG. 2 have a diagonal course.

It is essential that each stop 15 are arranged below the recesses 14a, which can be adjusted from a position below the table surface rest position upwards in an active stop position, as in FIG. 4 shown. It can also be seen there that only those stops 15 'are activated which match the dimensions and positions of the veneers placed on the alignment table. In the case of the narrow sides of the veneers, often only one stop needs to be activated; in the case of the long sides, at least two stops should be activated in each case.

In FIG. 2 In each case, a row of veneers 11 is shown in dash-dotted lines, in the coarse alignment, as the veneers are transferred from the drawing strip 13 to the alignment table 14. In order to align these veneers, those stops 15 located near the edge of the veneers 11 at the positions designated by the reference numeral 15 'are raised so that they project upwards beyond the table surface and project beyond the adjacent veneers. Then, the alignment first in the direction of arrow 1 and then in the direction of arrow 2 - in the below drawn alternative only in the diagonal direction - moved. In this shift relative to the stationary stops 15 and 15 'come the veneers sooner or later in contact with the activated stops 15' and are thus automatically aligned exactly in the longitudinal and transverse directions and brought into alignment. They then take the in FIG. 3 shown position. The stops are suitably mounted rotatably about their vertical axis, in order to favor the alignment.

As long as the same plate format is driven, the stops 15 'can remain in their upper action position.

Then, the veneers are removed together by vacuum suction 16 while maintaining their laying pattern from the alignment table, transported to the laying belt 10 and stored there in the correct position, as in FIG. 1 shown. After lifting the veneers from the alignment table, the alignment table returns to its original position.

After placing the glued carrier plates 3 on the lower veneers 11, the products can be transferred while maintaining their laying pattern via an intermediate transport 17 on a laying belt 19. On this laying belt 19 is carried out by means of stops a further alignment of the possibly displaced during transport parts in the predetermined laying pattern and then laying the top veneers 21. The top veneers 21 are treated as well as the bottom veneers 11, i. several veneer stacks are initially adjacent to each other on a helical roller track 22, where they undergo a coarse direction. From there, the uppermost layer of stacked veneer sheets is withdrawn through a vacuum belt 23 and placed on an alignment table 24.

The alignment table 24 has the same structure as the alignment table 14. Thus, the cover veneers 21 are brought into their desired position by individual activation of the stops located below the alignment table and by subsequent displacement of the table relative to the stops, as was previously the case with the lower veneers 11 has been described. A vacuum suction frame 18 then conveys the aligned veneer row from the alignment table 24 to the laying belt 19 and places it precisely on the products available there, ie on the support plates 3 already provided with a respective lower veneer 11.

Subsequently, the products are arranged on collecting belts 20 in several rows one behind the other, as many rows one after the other as fit into the press. FIG. 1 shows an intermediate stage in collecting. The complete package is then transported in its entirety by the collecting belts 20 in the press 25. There, the bottom and top veneers are connected under pressure and heat with their respective support plates.

FIG. 4 shows the alignment table 14 with differently activated stops. While four lower veneers 11 are next to each other in the upper part and consequently four stops 15 'are raised, the lower half of FIG. 4 larger veneers, of which only three pieces fit next to each other in the press and on the alignment table 14. The edge-side projection 15 '(on the left edge of the alignment table 14) remains active, whereas the other stops, which in the upper embodiment for aligning The three remaining lower veneers served, now remain in the lower rest position and for the other two attacks moved into the upper stop position.

The same individual control of the attacks also results perpendicular to the plane of the drawing according to the dimensions of the veneers in this direction.

The adjustment of the stops between their lower rest position and their upper active position is advantageously carried out by compressed air cylinder; but also solenoids or other drives would be possible.

The recesses 14a are shown in the embodiment narrow and slit-like. Of course, it would instead also be possible to provide larger recesses, such that a perforated plate or grid plate is formed as a support surface for the products. All that matters is that between the stops and the table a relative movement is possible whose length and direction is sufficient to align the overlying products to the desired position.

It is also within the scope of the invention to provide not always only a number of carrier plates and veneers on the respective levers, but several adjacent rows. For this purpose, only the vacuum suction frame 16 and 18 need to be supplemented with additional suckers. The transfer of the carrier plates 3 can be maintained in the manner described, if one deposits several rows one behind the other on the laying belt 10. Instead, of course, several rows of carrier plates could of course be transported together by a correspondingly redesigned conveyor on the laying belt 10.

It is also within the scope of the invention to use the alignment tables described not only for the alignment of the veneers, but also for the alignment of the carrier plates.

In summary, in all embodiments, the advantage that the alignment table according to the invention can align different sized and differently positioned workpieces with high accuracy. Above all, the alignment table allows several rows of workpieces to be aligned simultaneously, thereby making better use of the plant's capacity.

Claims (12)

1. Apparatus for producing veneered panels with a veneering station and a veneering press, wherein supporting panels (3) glued on at least one side and the appertaining veneers (11, 21) are transported into the veneering station and are placed on one another in alignment with one another and then are veneered on at least one side in the veneering press (25), wherein the alignment takes place on an aligning table (14, 24) by means of adjustable stops (15) which are distributed in a grid over the table surface and can be activated individually according to a predetermined laying pattern, wherein the stops (15) can be moved out of an inactive rest position below or above the table surface into an active stop position (15') in which they come into contact with the longitudinal and transverse edges of the veneers (11, 21) or supporting panels (3).
2. Apparatus as claimed in Claim 1, characterised in that the stops (15) are mounted below the table surface and the table surface has a plurality of openings (14a) for movement of the stops (15) into their active stop position (15').
3. Apparatus as claimed in Claim 1, characterised in that at least one approximately horizontal relative movement in the longitudinal and transverse direction - optionally in combination - takes place between the table surface and the stops (15).
4. Apparatus as claimed in Claim 3, characterised in that the relative movement is slowed down towards the end position.
5. Apparatus as claimed in Claim 2, characterised in that the openings (14a) are disposed like slits in the direction of the relative movement between the table surface and the stops.
6. Apparatus as claimed in Claim 1, characterised in that the aligning table (14, 24) can be connected to a vacuum in order to draw on the veneers (11, 21) or supporting panels (3) by suction.
7. Method of producing veneered panels, wherein supporting panels (3) glued on at least one side and the appertaining veneers (11, 21) are transported into the veneering station and are placed on one another in alignment with one another and then are veneered on at least one side in a veneering press (25), wherein a plurality of veneers (11, 21) or supporting panels (3) are individually aligned simultaneously on a common aligning table (14, 24) according o a predetermined laying position by means of a plurality of movable stops (15, 15') which are activated according to the predetermined laying pattern and come into contact with the longitudinal and/or transverse edges of the veneers (11, 21) or supporting panels (3), wherein for alignment a relative movement is produced between the aligning table (14, 24) and the stops (15') in the longitudinal and transverse direction, preferably in a diagonal direction, and the alignment takes place in the longitudinal and transverse direction.
8. Method as claimed in Claim 7, characterised in that the aligning table (14, 24) moves relative to the stops (15').
9. Method as claimed in Claim 7, characterised in that a plurality of veneers (11, 21) or supporting panels (3) are simultaneously aligned with their longitudinal or transverse edges along a common straight line.
10. Method as claimed in Claim 7, characterised in that the alignment begins on the narrow sides of the veneers (11, 21) or supporting panels (3).
11. Method as claimed in Claim 8, characterised in that first of all the aligned veneers (11, 21) or supporting panels (3) are taken off from the aligning table (14, 24) before the aligning table moves back into its starting position.
12. Method as claimed in Claim 7, characterised in that the stops (15, 15') of the veneers (11, 21) or supporting panels (3) can be turned about a vertical axis during alignment.

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