EP4015172B1 - Method and device for pressing edge strips - Google Patents

Description

The invention relates to a device according to the preamble of claim 1 and a method for pressing edge bands in which a device according to the preamble of claim 1 is used. Such a device and such a method are from the document DE 10 2009 016929 A1 known.

In wood processing, edge bands are attached to the narrow sides of plate-shaped workpieces, which are usually made of wood or wood substitutes. All plate-shaped workpieces have at least outer corner areas. With these, attaching edge tape across the corner is not a problem, as two adjacent narrow sides can be approached separately with an edge tape if in doubt. Since rollers are usually used for pressing, such outer corners do not pose a problem. The situation is different when there are inner corner areas. With such workpiece geometries, it is impossible to use a roller or roller to press the edge band down into the corner area.

Generic solutions, such as those from EP 1 990 152 B1 , DE 10 2009 016929 A1 or EP 1 607 199 B1 are known, therefore provide for working in the area of the inner corner by means of a pressing element, which has several pressing surfaces arranged at right angles or at an acute angle to one another. With these pressure surfaces it is possible to exert pressure on the edge band right into the corner. In EP 1 990 152 B1 A solution is presented in which the usual pressure roller is moved into the inner corner, but an additional pressure element is arranged on the side of the inner corner, which fills the empty space that cannot be reached by the pressure roller itself. This However, the device has the serious disadvantage that both narrow sides that meet in the inner corner must first be coated with an edge band, which then form a joint in the inner corner. The corresponding pressing element can then press the edge bands that abut one another in the inner corner into the corner. A continuous coating of an inner corner with a continuous edge band is therefore not possible with this device. In EP 1 607 199 B1 It is proposed to replace the pressure roller with a pressure shoe with a triangular cross-section and which can be rotated about a central axis.

With the latter solution, it is in principle possible to press a continuous edge band in the area of the inside corner, but at a high price: the pressure shoe there has to be pulled over a significant part of the edge band. This can cause traces to form on the edge band, which can adversely affect or even damage the appearance of the surface. There is therefore a need for improvements here, on the one hand to leave a corresponding pressing element in contact with the edge band for a sufficiently long time so that the gluing of the inner corner can be carried out satisfactorily, but sufficiently short so that as little edge band as possible due to friction of the pressing element on the surface of the edge band visually detrimental.

The object of the present invention is therefore to provide a device of the type mentioned which, if possible, reduces the shortcomings described.

This task is solved by a device with the features of claim 1 and a method with the features of claim 5.

Advantageous embodiments can be found in the respective subclaims.

The device according to the invention is used to press edge bands onto workpieces made of wood or wood substitute materials, which have at least two workpiece sections that are angled towards one another and form an inner corner. The device according to the invention has an edge band feed and at least one main pressure roller which can be rotated about a first axis of rotation for pressing the edge band fed from the feed to the workpiece onto the narrow side of the workpiece. Furthermore, the device according to the invention comprises a pressing element with two pressing surfaces which are angled relative to one another, in particular at an acute angle to one another. The latter are used to press the edge band onto the narrow side of the workpiece, especially in the area of the inside corner. The pressing element is arranged on a first pivoting lever. This enables the pressing element to be pivoted in a pivoting plane perpendicular to the first axis of rotation by means of the first pivoting lever.

The invention has several advantages. On the one hand, an edge band can be pressed into an inner corner of a workpiece using the pressing element. At the same time, however, the pressure roller can continue to rest against the edge band, so that the contact between the pressure element and the edge band is reduced to a minimum distance, which minimizes the leaving of marks on the edge band. Furthermore, due to the pivotability of the pressing element, the device according to the invention is able to pass over the inner corner with a continuous edge band when coating the workpiece with an edge band and thus continue the coating process uninterrupted. To do this, the pressure element can be pivoted around the pressure roller so that it is also available for entry into another inner corner.

According to an advantageous embodiment, it is provided that the device according to the invention comprises a secondary pressure roller, which is rotatably mounted on a second pivoting lever about a second axis of rotation, the second pivoting lever being arranged such that the secondary pressure roller is in a pivoting plane perpendicular to the first by means of the second pivoting lever Axis of rotation can be pivoted. The secondary pressure roller supports the main pressure roller when pressing the edge band onto the workpiece and can continue to maintain contact with the edge band when driving over an inside corner, for example when the main pressure roller has to be lifted off the edge band for a short time, and therefore ensure that there is no impairment of the pressure behavior. In addition, the secondary pressure roller can be moved or lifted off the edge band at any time because it is mounted on the second pivoting lever.

It is particularly advantageous if the first pivoting lever and/or the second pivoting lever is/are mounted pivotably about the first axis of rotation. On the one hand, this enables a particularly compact design of the entire unit. In addition, the pressure element, the main pressure roller and / or the secondary pressure roller can then be on a single one Leadership as a unit will be postponed. This is advantageous because the main pressure roller and pressure element or secondary pressure roller must be carried along during the coating process anyway.

It can be advantageous if the first pivoting lever and/or the second pivoting lever is/are dimensioned such that the pressure element and/or the secondary pressure roller moves on a path located radially outside the lateral surface of the main pressure roller when the associated pivoting lever is pivoted . This means that the components arranged on the pivoting levers can be moved independently of the position of the main pressure roller, without the main pressure roller impairing this movement. In particular, the pivoting levers can be of different lengths so that these two components do not interfere with each other when pivoting the secondary pressure roller and the pressure element. Advantageously, the first pivoting lever is shorter than the second pivoting lever, so that the pressing element can be pivoted between the main pressure roller and any secondary pressure roller that may be present.

According to the invention it is provided that the main pressure roller, the feed and the pressure element are mounted on a carrier, the carrier being pivotally mounted about an axis coaxial or parallel to the first axis of rotation. In this way, the entire unit arranged on the carrier can be moved relative to the workpiece, so that an optimal position of the supplied edge band and the main pressure roller or the pressure element can always be adjusted.

With the device described above, it is possible not only to coat an inner corner with a continuous edge band, but also to continuously coat other inner corners of a workpiece.

1. a. Bereitstellen eines Werkstücks mit zwei zueinander abgewinkelten Abschnitten, die eine Innenecke ausbilden;
2. b. Zuführen eines haftbar gemachten Kantenbandes an die Schmalseite des Werkstücks im Bereich des ersten Werkstückabschnitts;
3. c. Andrücken eines ersten Kantenbandabschnitts des zugeführten Kantenbandes an die Schmalseite des ersten Werkstückabschnitts mittels der Hauptandruckrolle, wobei eine Relativverschiebung zwischen Werkstück und Hauptandruckrolle erfolgt;
4. d. Schwenken des ersten Schwenkhebels, so dass das Anpresselement mit seiner ersten Anpressfläche zwischen der Hauptandruckrolle und der Innenecke des Werkstücks zur Anlage kommt und das Kantenband im Bereich des ersten Kantenbandabschnitts an die Schmalseite des ersten Werkstückabschnitts unter Fortsetzung der Relativverschiebung andrückt;
5. e. wenn die Spitze zwischen den beiden Anpressflächen des Anpresselements den Bereich der Innenecke erreicht, wird die Hauptandruckrolle vom ersten Kantenbandabschnitt abgehoben, wobei das Anpresselement das Kantenband in die Innenecke drückt, wobei vom Kantenband ein an den ersten Kantenbandabschnitt angrenzender zweiter Kantenbandabschnitt abgewinkelt wird;
6. f. Andrücken des zweiten Kantenbandabschnitts an die Schmalseite des zweiten Werkstückabschnitts mittels der Hauptandruckrolle, wobei eine Relativverschiebung zwischen Werkstück und Hauptandruckrolle erfolgt.

The invention also relates to a method for pressing an edge band onto the narrow side of workpieces made of wood or wood substitutes, in which a device described above is used. The method according to the invention has the following steps:

1. a. Providing a workpiece with two mutually angled sections that form an inside corner;
2. b. feeding an adhered edge band to the narrow side of the workpiece in the area of the first workpiece section;
3. c. Pressing a first edge band section of the supplied edge band onto the narrow side of the first workpiece section by means of the main pressure roller, with a relative displacement between the workpiece and the main pressure roller taking place;
4. d. Pivoting the first pivoting lever so that the pressing element comes into contact with its first pressing surface between the main pressure roller and the inner corner of the workpiece and presses the edge band in the area of the first edge band section onto the narrow side of the first workpiece section while continuing the relative displacement;
5. e. When the tip between the two pressure surfaces of the pressure element reaches the area of the inner corner, the main pressure roller is lifted off the first edge band section, with the pressure element pressing the edge band into the inner corner, from Edge band, a second edge band section adjacent to the first edge band section is angled;
6. f. Pressing the second edge band section onto the narrow side of the second workpiece section by means of the main pressure roller, with a relative displacement between the workpiece and the main pressure roller.

With the method according to the invention it is possible to use a continuous edge band, which only has to be pressed into the inner corner by means of the pressing element. The edge band is folded or bent in the inner corner and can then be pressed against the not yet coated narrow side of the workpiece with the second edge band section created by the folding or bending.

If the workpiece has another inner corner, this can be repeated, in particular by repeating the steps given above, without the edge band having to be cut off or reapplied.

It can preferably be provided that during or after step f. a step g. is carried out, in which the second pressing surface of the pressing element presses the second edge band section against the narrow side of the second workpiece section. Here, the folded second edge band section is already pressed against the workpiece in the inner corner. It is not necessary to set down the pressing element as it only needs to be turned over its tip.

Advantageously, it can be provided that the pressing element presses on the second edge band section follows the main pressure roller. This ensures that proper pressing occurs even in the sections on the second edge band section that the main pressure roller cannot reach. In other words, the tracking can take place until a section on the second edge band section is reached, against which the main pressure roller can already press.

According to a special variant of the method according to the invention, it can also be provided that at least during steps c. and d., especially during steps e. and f. the secondary pressure roller rests against the first edge band section following the main pressure roller. It is then possible for the main pressure roller to be lifted off the edge band and the secondary pressure roller to remain in contact with the corresponding edge band section for as long as possible.

The invention is explained below with reference to Figures 1 to 8 explained in more detail.

Figure 1 shows schematically a device according to the invention in a top view.

Figures 2 to 8 show top views of a workpiece with an inner corner of different process sections using the device Figure 1 carried out method according to the invention.

In Figure 1 a device 1 according to the invention is shown schematically. A feed 11 for edge bands 3 is preferably attached to a carrier 10. The device 1 according to the invention further comprises a preferred also arranged on the carrier 10 main pressure roller 13, which is rotatably mounted about a first axis of rotation A. 12 denotes an activation device to prepare the edge band 3 for joining to the workpiece. The activation device 12 can be an adhesive application unit, but it can also be a laser or a hot air source or the like. The activation device 12 is preferably also arranged on the carrier 10. Furthermore, the device 1 according to the invention comprises a pressing element 17, which is arranged on a first lever 16. The first lever 16 is pivotally mounted - preferably on the carrier 10 - in the direction of the arrow P2, most preferably about the axis A. The pressing element 17 has a first pressing surface 17b and a second pressing surface 17a. These two pressure surfaces 17a and 17b are angled towards one another and in particular form an acute angle with the tip 17c.

Optionally, the device 1 according to the invention can also have a secondary pressure roller 15, which in turn is mounted on a second lever 14 so that it can rotate about an axis B. The second lever 14 can be pivoted about an axis which is preferably mounted on the carrier 10, as indicated by the arrow P1. The pivot axis of the lever 14 preferably corresponds to the axis A.

In the Figure 1 The components shown can be pivoted in the XY plane as a unit or synchronized with one another.

The use of the in Figure 1 The device shown when coating a workpiece with an inner corner using the Figures 2 to 8 explained.

The workpiece 2 has two workpiece sections 21, 22, between which an inner corner 20 is formed. To coat the workpiece 2 with the edge band 3, this is conveyed through the feed 11 in the direction of the narrow side of the workpiece 2, activated via the activation device 12 in the manner described above and pressed against the narrow side of the workpiece 2 by means of the main pressure roller 13. At the beginning of the process, the section 22 of the workpiece 2 is first coated with the edge band 3.

As in Figure 3 shown, the edge band 3 is moved to the narrow side 22 of the workpiece 2 by means of the feed 11 and pressed against the narrow side 22 with the pressure roller 13. The unit consisting of pressure roller 13 and pressure element 17 is then moved relative to the workpiece, in the example shown in direction X. The pressure roller 13, which rotates about the axis A, runs over the supplied edge band 3 and presses it against the narrow side 22 over the course of it. Optionally, a secondary pressure roller 15 can also be brought to press or rest against the edge band 3 by pivoting the lever 14 in order to support the pressing process or to perform a re-pressing function in an area of the edge band that the pressure roller 13 has already passed over.

Before the inner corner 20 is reached by the pressure roller 13, Figure 5 , the pressing element 17 is pivoted by pivoting the lever 16 so that its first pressing surface 17b comes to rest on the edge band 3, more precisely the edge band section 3b, which rests on the narrow side 22 of the workpiece 2. The relative movement between the workpiece 2 and the unit 10 ensures ensure that the edge band 3 is pushed and pressed into the corner 20 of the workpiece 2 by means of the pressing element 17, as shown in Figure 6 is shown. The entire unit, or the overall carrier 10, is from the one previously in the Figures 2 to 4 horizontal position shown in the Figures 6 to 8 vertical position shown has been pivoted. Here too, the preferred pivot axis is axis A, around which the pressure roller is also pivoted. Other pivoting movements for the unit 10 are also conceivable. If the tip 17c of the pressing element 17 has reached the inner corner 20, the edge band 3 is bent or folded over in the corner area, this bend dividing the edge band into the section 3b previously applied to the narrow side 22 and a further section 3a to be applied to the adjacent narrow side 21 . The main pressure roller 13 is now moved against this section 3a, so that the main pressure roller 13 now presses the section 3a of the edge band 3 against the second narrow side 21 of the workpiece 2. The pressing element 17 is held in the inner corner 20 and continues to press the bend of the edge band 3 into the inner corner 20. By moving the main pressure roller 13, Figure 7 , against the section 3a or the narrow side 21, the second pressure surface 17a now rests against the section 3a of the edge band. In this situation described, the possibly existing secondary pressure roller 15 remains in contact with the first section 3b of the edge band 3, so that the main pressure roller 13 can be released from the system with section 3b and moved into the system with section 3a.

Is that in? Figure 7 The situation shown is reached, a further relative displacement of the main pressure roller occurs 13 and the workpiece now parallel to the direction Y. Of course, the two workpiece sections 21 and 22 do not have to form a right angle with one another, any other angled inner corner 20 is also conceivable.

If the main pressure roller 13 has been brought into position accordingly, the pressure element 17 with its second pressure surface 17a remains in contact with the edge band section 3a while executing the above-mentioned relative movement along the direction Y until the section of the edge band 3a between the inner corner 20 and the Point at which the main pressure roller first touches the edge band 3a is pressed against the narrow side 21 of the workpiece 2. In this situation, the pressure element 17 follows the main pressure roller. This situation is in Figure 8 shown.

If there is another inner corner on the workpiece 2 in the feed direction Y and is also to be coated with the edge band 3, the pressing element 17 can be moved out of the in. by pivoting the lever 16 about the axis A of the main pressure roller 13 Figure 8 shown trailing position can be pivoted into a leading position, in which the pressure surface 17b then again rests on the edge band section 3a, and with reference to the Figures 5 to 7 The process described is then repeated accordingly.

Claims (8)

1. Device (1) for pressing edge strips (3) onto workpieces (2) of wood or wood substitutes having at least two workpieces (21, 22) angled relative to one another and forming an inner corner (20), comprising an edge strip supply feed (11) wherein the device (1) further comprises a pressing element (17) with two pressing surfaces (17a, 17b) angled relative to one another, in particular at an acute angle relative to one another, for pressing the edge strip (3) onto the narrow side of the workpiece (2), in particular in the region of the inner corner (20),
   wherein the pressing element (17) is arranged on a first pivot lever (16) so that the pressing element (17) can be pivoted by means of the first pivot lever (16) in a pivot plane (XY) perpendicular to the first axis of rotation (A) characterised in that the device comprises at least one main pressing roller (13) rotatable about a first axis of rotation (A) for pressing the edge strip (3), supplied from the feed supply (11) to the workpiece (2), onto the narrow side of the workpiece (2), and that the main pressing roller (13), the feed supply (11) and the pressing element (17) are mounted on a carrier (10) wherein the carrier (10) is mounted for pivotal movement about an axis which is coaxial or parallel to the first axis of rotation (A).
2. Device (1) according to Claim 1 characterised in that it comprises a secondary pressing roller (15) which is mounted on a second pivot lever (14) for rotation about a second axis of rotation (B), wherein the second pivot lever (14) is arranged so that the secondary pressing roller (15) can be pivoted by means of the second pivot lever (14) in a pivot plane (XY) perpendicular to the first axis of rotation (A).
3. Device (1) according to Claim 1 or 2 characterised in that the first pivot lever (16) and/or the second pivot lever (14) is/are mounted to pivot about the first axis of rotation (A).
4. Device (1) according to Claim 3 characterised in that the first pivot lever (16) and/or the second pivot lever (14) is/are dimensioned so that the pressing element (17) and/or the secondary pressing roller (15) during pivoting of the associated pivot lever (16, 14) is/are moved on a path set radially outside of the lateral surface of the main pressing roller (13).
5. Method for pressing an edge strip (3) onto the narrow side of workpieces (2) of wood or wood substitutes in which a device (1) according to one of the preceding claims is used, comprising the following steps:

   a. Providing a workpiece (2) with two portions (21, 22) angled relative to one another to form an inner corner (20);

   b. Supplying an adherent edge strip to the narrow side of the workpiece (2) in the region of the first workpiece portion (22);

   c. Pressing a first edge strip portion (3b) of the supplied edge strip (3) onto the narrow side of the first workpiece portion (22) by means of the main pressing roller (13), wherein a relative displacement takes place between the workpiece (2) and main pressing roller (13);

   d. Pivoting the first pivot lever (16) so that the pressing element comes to bear with its first pressing surface (17b) between the main pressing roller (13) and the inner corner (20) of the workpiece, and presses the edge strip (3) in the region of the first edge strip portion (3b) onto the narrow side of the first workpiece portion (22) whilst continuing the relative displacement;

   e. When the tip (17c) between the two pressing surfaces (17b, 17a) of the pressing element (17) reaches the region of the inner corner (20) the main pressing roller (13) is removed from the first edge strip portion (3b), wherein the pressing element (17) presses the edge strip (3) into the inner corner (20), wherein a second edge strip portion (3a) adjoining the first edge strip portion (3b) is angled away from the edge strip (3);

   f. Pressing the second edge strip portion (3a) onto the narrow side of the second workpiece portion (21) by means of the main pressing roller (13), wherein a relative displacement takes place between the workpiece (2) and the main pressing roller (13).
6. Method according to Claim 5 characterised in that during or after step f. a step g. is carried out in which the second pressing surface (17a) of the pressing element (17) presses the second edge strip portion (3a) against the narrow side of the second workpiece portion (21).
7. Method according to Claim 6 characterised in that during pressing of the second edge strip portion (3a) the pressing element (17) trails the main pressing roller.
8. Method according to one of Claims 5 to 7 where also dependent on Claim 2, characterised in that at least during steps c. and d., in particular also during steps e. and f., the secondary pressing roller (15) bears against the first edge strip portion (3b) trailing the main pressing roller (13).

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