EP4015172A1 - Method and device for pressing edge strips - Google Patents

Abstract

The device (1) serves to press edge bands (3) onto workpieces (2) made of wood or wood substitutes, which have at least two workpiece sections (21, 22) which are angled towards one another and form an inside corner (20). The device (1) has an edge band feed (11) and at least one main pressure roller (13) which can be rotated about a first axis of rotation (A) for pressing the edge band (3) fed from the feed (11) to the workpiece (2) onto the narrow side of the workpiece (2). In addition, the device (1) comprises a pressing element (17) with two pressing surfaces (17a, 17b) which are angled towards one another, in particular at an acute angle to one another, for pressing the edging strip (3) onto the narrow side of the workpiece (2), particularly in the region of the inner corner (20th ). The pressing element (17) is arranged on a first pivoting lever (16), so that the pressing element (17) can be pivoted by means of the first pivoting lever (16) in a pivoting plane (XY) perpendicular to the first axis of rotation (A).

Description

The invention relates to a device according to the preamble of claim 1 and a method for pressing on edge bands.

In wood processing, edge bands are attached to the narrow sides of panel-shaped workpieces, which are usually made of wood or wood substitutes. All panel-shaped workpieces have at least outer corner areas. With these, the attachment of edge bands across the corner is unproblematic, since two adjacent narrow sides can be approached separately with an edge band in case of doubt. Since rolls or rollers are usually used for pressing, such outside corners do not pose a problem. The situation is different if there are inside corner areas. With such workpiece geometries, it is impossible to press the edgeband into the corner area with a roller or cylinder.

Generic solutions, such as those from EP 1 990 152 B1 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 an acute angle to one another. With these pressure surfaces, it is possible to exert pressure on the edgeband 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 a pressure element is additionally arranged on the side of the inner corner, which fills the empty space that cannot be reached by the pressure roller itself. However, this 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 forms 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 inside 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 by a pressure shoe which is simultaneously triangular in cross section and which can be rotated about a central axis.

With the last-mentioned solution, it is in principle possible to press a continuous edging in the area of the inner corner, but at a high price: the pressure shoe there has to be pulled over a significant part of the edging. As a result, marks can form on the edgeband that adversely affect or even damage the appearance of the surface. There is therefore a need for improvements here, on the one hand leaving a corresponding pressing element in contact with the edging strip for a sufficiently long time so that the inside corner can be glued satisfactorily, but sufficiently short so that as little edging strip as possible is damaged by friction of the pressing element on the surface of the edging strip optically adversely affect.

It is therefore the object of the present invention to provide a device of the type mentioned at the outset which, as far as possible, reduces the inadequacies described.

This object is achieved by a device having the features of claim 1 and a method having the features of claim 6.

Advantageous embodiments can be found in the respective subclaims.

The device according to the invention is used for pressing edge bands onto workpieces made of wood or wood substitutes, which have at least two workpiece sections which are angled relative to one another and form an inside 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 edging tape against 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 allows the pressing element to be pivoted by means of the first pivot lever in a pivot plane perpendicular to the first axis of rotation.

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

According to an advantageous embodiment, it is provided that the device according to the invention comprises a secondary pressure roller which is mounted on a second pivoting lever so that it can rotate about a second axis of rotation, the second pivoting lever being arranged in such a way that the secondary pressure roller can be moved by means of the second pivoting lever in a pivoting plane perpendicular to the first 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 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, thus ensuring that the pressure behavior is not impaired. In addition, the secondary pressure roller can be advanced or lifted from the edge band at any time due to its bearing on the second swivel lever.

It is particularly advantageous if the first pivoted lever and/or the second pivoted 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 moved as a unit on a single guide. This is advantageous since 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 pivoted lever and/or the second pivoted lever is/are dimensioned such that the pressure element and/or the secondary pressure roller is/are moved when the associated pivoted lever is pivoted on a path located radially outside the lateral surface of the main pressure roller . In this way, the components arranged on the pivoting levers can be displaced 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 impede one another when pivoting the secondary pressure roller and the pressing element. Advantageously, the first pivoting lever is shorter than the second pivoting lever, so that the pressure element can be pivoted between the main pressure roller and any secondary pressure roller that may be present.

Provision is preferably made for the main pressure roller, the feed and the pressure element to be mounted on a carrier, the carrier being mounted so as to be pivotable about an axis which is 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 set.

With the device described above, it is possible not only to coat an inside corner with a continuous edging strip, but then in particular to also continuously coat other inside 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 as 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. supplying a bonded edge band to the edge of the workpiece in the area of the first workpiece section;
3. c. Pressing a first edge band section of the supplied edge band against 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. i.e. Pivoting the first pivoting lever so that the pressing element comes to rest with its first pressing surface between the main pressing roller and the inner corner of the workpiece and presses the edgeband in the area of the first edgeband section against the narrow side of the first workpiece section while continuing the relative displacement;
5. e. when the tip between the two pressing surfaces of the pressing element reaches the area of the inner corner, the main pressure roller is lifted off the first edge band section, the pressing element pressing the edge band into the inner corner edge band a second edge band section adjoining the first edge band section is angled;
6. f. Pressing the second edge band section against 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 taking place.

With the method according to the invention, it is possible to use a continuous edge band that only has to be pressed into the inside corner by means of the pressing element. The edging tape is folded or kinked in the inner corner and can then be pressed against the not yet coated narrow side of the workpiece with the second edging tape section resulting from the folding or kinking.

If the workpiece has another inside corner, this can be repeated, in particular by repeating the steps indicated above, without the edge band having to be cut off or re-applied.

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. In this case, the folded second edge band section is already pressed against the workpiece in the inside corner. It is not necessary to set down the pressing element, since it only has to be turned over its tip.

Advantageously, it can be provided that the pressing element when pressing the second edge band section follows the main pinch roller. This ensures that proper pressing also takes place in the sections on the second edge band section that the main pressure roller cannot reach. In other words, the trailing 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 particular variant of the method according to the invention, it can also be provided that at least during steps c. and d., in particular also during steps e. and f. the secondary pinch roller abuts against the first edge band section trailing the main pinch roller. It is then possible that the main pressure roller is lifted off the edge band and the secondary pressure roller remains in contact with the corresponding edge band section.

• Figur 1 zeigt schematisch eine erfindungsgemäße Vorrichtung in Draufsicht.
• Figuren 2 bis 8 zeigen in Draufsichten auf ein Werkstück mit einer Innenecke unterschiedliche Prozessabschnitte des mit der Vorrichtung aus Figur 1 ausgeführten erfindungsgemäßen Verfahrens.

The invention is based on the Figures 1 to 8 explained in more detail.

• figure 1 shows schematically a device according to the invention in plan view.
• Figures 2 to 8 show plan views of a workpiece with an inside corner showing different process sections of the device figure 1 executed 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 . Furthermore, the device 1 according to the invention 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 designates an activation device to prepare the edgeband 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—preferably on the carrier 10—mounted so that it can pivot 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 contact 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, for its part, is mounted on a second lever 14 such that it can rotate about an axis B. The second lever 14 can be pivoted about an axis that is preferably mounted on the support 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.

It will now use the in figure 1 device shown when coating a workpiece with an inside corner based on 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 by 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 method, firstly the section 22 of the workpiece 2 is coated with the edgeband 3 .

As in figure 3 shown, the edge band 3 is moved up 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 X direction in the example shown. The pressure roller 13, which rotates about the axis A, runs over the supplied edging strip 3 and presses it against the narrow side 22 over the course of the latter. Optionally, a secondary pressure roller 15 can also be brought to bear on or to contact 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.

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 edging strip 3, more precisely the edging strip section 3b, which rests on the narrow side 22 of the workpiece 2. The relative movement between the workpiece 2 and the unit 10 provides ensuring 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 is shown in figure 6 is shown. The entire unit or the overall carrier 10 is from the previously in the Figures 2 to 4 shown horizontal position in one of the Figures 6 to 8 shown vertical position has been pivoted. Here again, the preferred pivoting axis is axis A, about which the pressure roller is also pivoted. However, other pivoting movements for the unit 10 are also conceivable. When the tip 17c of the pressing element 17 has reached the inside corner 20, the edge band 3 is kinked or folded over in the corner area, with this fold 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 adjoining 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 fold of the edge band 3 into the inner corner 20 . By shifting the main pinch roller 13, figure 7 , Against the section 3a or the narrow side 21, the second contact surface 17a now rests against the section 3a of the edge band. The secondary pressure roller 15 that may be present remains in contact with the first section 3b of the edge band 3 in this situation, so that the main pressure roller 13 can be released from the system with the section 3b and moved into the system with the section 3a.

Is the in figure 7 Reaches the situation shown, there is a further relative displacement of the main pinch roller 13 and the workpiece now parallel to 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 inside corner 20 is also conceivable.

If the main pressure roller 13 is brought into position accordingly, the pressure element 17 remains with its second pressure surface 17a in contact with the edge band section 3a while performing the above-mentioned relative movement in the Y direction until the section of the edge band 3a between the inner corner 20 and the Point at which the main pressure roller touches the edge band 3a for the first time is pressed against the narrow side 21 of the workpiece 2. In this situation, the pressing element 17 follows the main pressing 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 edgeband 3, the pressure element 17 can be removed from the position shown in figure 8 illustrated trailing position in a leading position, in which the contact surface 17b then again rests against the edge band section 3a, are pivoted, and with reference to the Figures 5 to 7 The process described is then repeated accordingly.

Claims (9)

Device (1) for pressing edge bands (3) onto workpieces (2) made of wood or wood substitutes, with at least two workpiece sections (21, 22) which are angled towards one another and which form an inside corner (20), having an edge band feed (11) and at least one Main pressure roller (13) rotatable about a first axis of rotation (A) for pressing the edgeband (3) fed from the feed (11) to the workpiece (2) onto the narrow side of the workpiece (2), the device (1) further having a pressing element (17) with two pressing surfaces (17a, 17b) which are angled to one another, in particular at an acute angle to one another, for pressing the edging strip (3) against the narrow side of the workpiece (2), in particular in the area of the inner corner (20),
characterized,
that the pressing element (17) is arranged on a first pivoting lever (16), so that the pressing element (17) can be pivoted by means of the first pivoting lever (16) in a pivoting plane (XY) perpendicular to the first axis of rotation (A). Device (1) according to claim 1,
characterized,
that it comprises a secondary pressure roller (15) which is mounted on a second pivoted lever (14) so that it can rotate about a second axis of rotation (B), the second pivoted lever (14) being arranged in such a way that the secondary pressure roller (15) can be rotated by means of the second pivoted lever (14) can be pivoted in a pivoting plane (XY) perpendicular to the first axis of rotation (A). Device (1) according to claim 1 or 2,
characterized,
that the first pivoting lever (16) and/or the second pivoting lever (14) is/are pivotably mounted about the first axis of rotation (A). Device (1) according to claim 3,
characterized,
that the first pivoting lever (16) and/or the second pivoting lever (14) is/are dimensioned such that the pressure element (17) and/or the secondary pressure roller (15) moves on a radially outside the outer surface of the main pressure roller (13) located web is / are moved. Device (1) according to one of the preceding claims,
characterized,
that the main pressure roller (13), the feed (11) and the pressure element (17) are mounted on a carrier (10), the carrier (10) being pivotably mounted about an axis coaxial or parallel to the first axis of rotation (A). Method for pressing an edge band (3) onto the narrow side of workpieces (2) made of wood or wood substitutes, in which a device (1) according to one of the preceding claims is used, having the following steps: a. Providing a workpiece (2) with at least two mutually angled sections (21, 22) which form an inside corner (20); b. feeding an edge band made adhesive to the narrow side of the workpiece (2) in the region of the first workpiece section (22); c. Pressing a first edge band section (3b) of the supplied edge band (3) against the narrow side of the first workpiece section (22) by means of the main pressure roller (13), with a relative displacement between the workpiece (2) and the main pressure roller (13); i.e. Pivoting the first pivoting lever (16) so that the pressing element comes to rest with its first pressing surface (17b) between the main pressing roller (13) and the inner corner (20) of the workpiece and the edge band (3) in the area of the first edge band section (3b) presses against the narrow side of the first workpiece section (22) while continuing the relative displacement; e. when the tip (17c) between the two contact surfaces (17b, 17a) of the contact pressure element (17) reaches the area of the inner corner (20), the main contact roller (13) is lifted off the first edge band section (3b), with the contact pressure element (17) Pressing the edge band (3) into the inside corner (20), a second edge band section (3a) adjoining the first edge band section (3b) being angled from the edge band (3); f. pressing the second edge band section (3a) against the narrow side of the second workpiece section (21) by means of the main pressure roller (13), with a relative displacement between the workpiece (2) and the main pressure roller (13) taking place. Method according to claim 6,
characterized,
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 band section (3a) against the narrow side of the second workpiece section (21). Method according to claim 7,
characterized,
that the pressure element (17) follows the main pressure roller when the second edge band section (3a) is pressed. A method according to any one of claims 6 to 8 when also dependent on claim 2,
characterized,
that at least during steps c. and d., in particular also during steps e. and f. the secondary pinch roller (15) trailing the main pinch roller (13) abuts against the first edge band section (3b).

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