EP2251166B1 - Gluing body - Google Patents

Description

The present invention relates to a gluing unit for use in a device for processing plate-shaped workpieces, in particular of wood or wood-based materials, according to the preamble of claim 1.

The gluing unit serves for gluing an edge material to a narrow surface of the workpiece. It has a housing, on which a glue application roller for applying glue is mounted on the narrow surface of the workpiece. The gluing unit can also be coupled to a drive, by means of which the glue application roller can be set in rotation.

State of the art

Devices of the type mentioned are, for example, from the EP 0 728 561 known. Here the gluing unit is composed of two basic elements, namely a supply unit and a gluing unit. The gluing unit can be coupled to a spindle unit of a machining center. When coupled to the spindle unit gluing the anzuleimende edge material is guided in the region of a glue applicator roll and coated with this one-sided with glue from a glue container. Subsequently, the coated edge material is adjusted to the edge of the workpiece.

An alternative solution is from the EP 1 714 756 A1 ("Easy Edge") known. Unlike the former solution, a hot melt adhesive is not applied to the edge material but directly to the narrow surface of the workpiece (direct glue application). The glue is applied by means of a slot nozzle on the narrow surface of the workpiece. In order to ensure an even application of glue, this slot nozzle must be geometrically clearly moved around the workpiece contour.

The slot nozzle must always be tangential to the workpiece surface. Tracking is difficult with flexible material contours. This limits the minimum radius and geometry to be machined.

Finally revealed DE 102 34 618 A1 (Biesse) a gluing unit according to the preamble of claim 1. The gluing unit is here an integral part of a machine for processing panels made of wood or the like. This machine comprises a mobile bridge which carries an assembly which serves to apply an edge strip to the narrow surface of the workpieces. The assembly includes a loading unit that moves the edge strip against the contour. A pressure roller is part of the feed unit. Said assembly also includes the gluing unit with an applicator roller for applying the glue to the periphery of the workpiece. This applicator is provided in the feed direction of the group in front of the pressure roller and we are driven by a separate motor whose output shaft is parallel to the axis of the applicator roller. Another drive is provided to control the angular position of the entire assembly about an axis that is parallel to the longitudinal axes of the pressure roller and the applicator roller.

The EP 0 945 235 A2 shows the features of the preamble of claim 1.

The DE 19 15 587 A1 shows a method of bonding a strip of material to the side of a workpiece, wherein the workpiece is pressed against rotation of its own plane while simultaneously feeding a spring urged by a spring against the side of the workpiece Adhesive strip is driven. The apparatus shown comprises a heated glue application container with a glue application roller and a glue delivery device.

Presentation of the invention

Object of the present invention is to develop a gluing unit such that Anleimvorgänge can be realized more flexible and smaller radii and more complicated geometries can be edited by means of the glueing unit.

This object is achieved in a gluing unit of the type mentioned fact that the glue applicator roll is centrally provided in the glueing unit, so that its longitudinal axis is in the extension of an output shaft of the drive.

The glue application roller can thus be set directly in rotation by means of the drive. Due to the central arrangement of the glue applicator roll in the gluing unit, the machining processes to be carried out with the gluing unit according to the invention are also clearly programmable from a CNC-technical point of view. In other words, the glue application roller is firmly integrated in the glueing unit and can thereby be CNC contoured around the workpiece driven.

The glue application takes place directly on the narrow surface of the workpiece. The direct glue application has the advantage that better adhesion can be achieved due to the open-pore structure of the workpiece material.

Preferred optional features are described in the dependent claims.

The glueing unit preferably also has an edge feed for feeding the edge material to be applied to the narrow surface of the workpiece, which is likewise mounted on the housing. The central arrangement of the glue application roller according to the invention then makes it possible that the edge feed with respect to the housing in order an axis is pivotable about to change the lead angle of the edge material to the narrow surface of the workpiece.

The edge guide can thus be pivoted about a separate axis, a so-called C-axis, with respect to the housing of the gluing unit and around the glue application roller. As a result, the entry angle of the edge material can always be suitably adapted to the contour of the workpiece, by always selecting the appropriate entry angle for shallower and steeper contours. So also the treatment of smaller radii becomes possible. The entry angle of the edge material is controlled independently of the angle of the glue applicator roll.

The adjustable edge feed can be provided for example in the form of a feed path.

The axis about which the edge feed is pivotable coincides suitably with the longitudinal axis of the glue applicator roll. The edge feed is thus arranged pivotable about the central longitudinal axis of the glue applicator roll.

In known manner, the gluing unit can also have a pressure roller which is provided in the processing direction of the workpieces behind the glue application roller and serves to press the edge material to be applied on the glue-coated workpiece surface. In this case, the longitudinal axis of the pressure roller preferably also runs parallel to the said axis, around which the edge feed is pivotable, which, as stated, is preferably the longitudinal axis of the glue application roller.

The pressure roller is then preferably independent of the edge feed with respect to the housing also to one

Axis pivoted, which may coincide with the longitudinal axis of the glue applicator roll.

A glue container may be present for storing the glue to be applied. If the glue application roller is mounted at one end in the housing, the other, free end of the glue application roller can then be located in the glue container. Preferably, then a guide means is provided to convey the glue by rotation of the glue application roller out of the glue container in the direction of the first end of the glue application roller. By rotation of the glue application roller, the glue on the guide device rises up into the area in which the glue is transferred from the glue application roller to the workpiece surface.

In addition, means may be provided for heating the glue to its operating temperature.

In the simplest embodiment, the gluing unit according to the invention operates without own edge transport. In a preferred embodiment, however, a device for transporting the edge material and / or a device for cutting the edge material is provided, which are pivotable about the said axis together with the edge feed.

The gluing unit according to the invention can be used as a change unit or a fixed unit.

In the case of use as a fixed aggregate, the gluing unit is firmly coupled to the drive. The drive will be realized as a drive motor. The longitudinal axis of the centrally arranged glue application roller is then in the extension of the output axis of this drive motor.

In the case of use as a change unit, the gluing unit can be designed in particular for use in a machining center for processing plate-shaped workpieces, which consist in particular of wood or wood-based materials. The machining center has a spindle unit for receiving machining tools and processing units. The gluing unit is designed so that it can be exchanged from a storage in the spindle unit and coupled to the spindle unit via an interface. In this case, the gluing unit is configured such that the longitudinal axis of the glue application roller in the replaced state lies in the extension of the longitudinal axis of a work spindle mounted in the spindle unit of the machining center.

The glue application roller is thus set directly in rotation via the spindle unit, without the need for a separate drive would be provided.

The stocking may be any known tool stocker (e.g., disc or chain changer) or a separate device that is appropriately constructed in, on, or around the machine.

The gluing unit is preferably completely replaceable in the spindle unit.

Brief description of the drawings

Figur 1

stark schematisiert in einer Draufsicht ein komplettes Bearbeitungszentrum zum Bearbeiten von plattenförmigen Werkstücken;

Figur 2

den grundsätzlichen Aufbau eines erfindungsgemäßen Anleimaggregats als Seitenansicht im Schnitt;

Figur 3

eine Draufsicht auf das Anleimaggregat gemäß Fig. 1;

Figur 4

eine Draufsicht des Leimbehälters des erfindungsgemäßen Anleimaggregats;

Figur 5

eine detailliertere Draufsicht auf das Anleimaggregat gemäß Fig. 1;

Figur 6

drei Möglichkeiten zur thermischen Aufbereitung des Leims;

Figur 7

eine weitere Ansicht des erfindungsgemäßen Anleimaggregats aus Fig. 2 und 3 ohne zusätzlichen Kantentransport; und

Figur 8

eine Weiterbildung des erfindungsgemäßen Anleimaggregats mit zusätzlichem Kantentransport.

It shows

FIG. 1

highly schematic in a plan view of a complete machining center for machining plate-shaped workpieces;

FIG. 2

the basic structure of a gluing unit according to the invention as a side view in section;

FIG. 3

a plan view of the gluing unit according to Fig. 1 ;

FIG. 4

a plan view of the glue container of the gluing unit according to the invention;

FIG. 5

a more detailed plan view of the gluing unit according to Fig. 1 ;

FIG. 6

three options for thermal processing of the glue;

FIG. 7

another view of the gluing unit according to the invention FIGS. 2 and 3 without additional edge transport; and

FIG. 8

a development of the gluing unit according to the invention with additional edge transport.

Detailed explanation of preferred embodiments

In the following, for further explanation and for better understanding of the invention, embodiments are described in more detail with reference to the accompanying drawings.

It should first be explained that the gluing unit according to the invention can be used in particular as a changing unit in a CNC machining center for processing plate-shaped workpieces.

Such a machining center is schematically in FIG. 1 shown. In a manner known per se, it comprises a machine frame 1 which is equipped with two straight guides 2 extending in the X direction. On the linear guides 2, a stand 6 is movable in the X direction mounted, which carries on its upper side a boom 3, which extends in the Y direction.

The boom 3 has at its in FIG. 1 right side extending in the Y direction straight guide 4, on which a spindle unit 5 is movably mounted in the Y direction.

Due to the described arrangement, the spindle unit 5 can be moved in the X and Y directions via a processing table 7 connected to the machine frame 1, which carries the plate-shaped workpieces W to be processed. The arrangement is made such that the spindle unit 5 can reach each point of the machining table 7 and in this way can process one or more workpieces W arranged on the machining table 7. The spindle unit 5 and / or stored in this work spindle (not shown), this can be done via corresponding guides in a conventional manner additionally in the Z direction, ie with respect to the plane of the FIG. 1 be moved up and down.

The workpiece W is clamped on the processing table 7 with conventional clamping means, for example suction devices (not shown).

On the opposite side of the machining table, a magazine assembly 9 is attached to the boom 3 or the stand 6. This can be configured in a known manner and carries the necessary for the implementation of the machining operations on the workpiece W machining tools and processing units. In FIG. 1 the magazine assembly 9 is designed in the form of a disk magazine.

The magazine arrangement 9 is located in the area of influence of the spindle unit 5, so that the respective machining tool or processing unit of the magazine arrangement 9 (for example, in the so-called pick-up method) is selected according to the specifications. remove and after processing can settle in this again.

In the magazine assembly 9, the processing tools or processing units are in a rest position. The work spindle of the spindle unit 5 is equipped with a so-called interface (not shown), via which the machining tools and processing units are detected and held during the machining process and supplied with all necessary for their function power and control means. This primarily includes the supply of the torque required for the respective work process as well as the supply of pneumatic, hydraulic or electrical energy including the supply of data for the control and regulation.

The adoption of a machining tool or processing unit in the spindle unit 5 from the rest station in the magazine assembly 9 is generally referred to in the art as "replacement".

This in FIG. 1 shown machining center is surrounded by a protective wall 10. In the region of the right end of the travel path of the jib 3 and the spindle unit 5, an edge magazine 11 is arranged in the protective wall 10, which cooperates with an arranged between the edge magazine 11 and the machining center edge transfer device 12.

In the following, preferred embodiments of a gluing unit according to the invention will now be described, which can be interchanged as a whole in the spindle unit 5. For the sake of clarity, only the parts and functions of the glueing units according to the invention which are necessary for the understanding of the invention will be described. The FIGS. 2 and 3 first show the basic structure of a first preferred embodiment of a gluing unit according to the invention.

The gluing unit has a housing 13, which is equipped on its upper side in a manner known per se with an aggregate-side interface, with which the gluing unit can be coupled to the work spindle of the spindle unit 5 of the machining center. The interface includes in a known manner a cone 16 for torque transmission. The longitudinal axis L _{K of} the cone 16 is in the coupled state in the extension of the longitudinal axis of the work spindle of the spindle unit 5. The interface also includes connection contacts (not shown) for the supply of electrical energy and for the supply of data for control and regulation.

That in the FIGS. 2 and 3 Gluing unit shown is for coating the narrow surface of the workpiece W with glue and for subsequent application of an edge material K (hereinafter also simply "edge K") set up on the coated narrow surface.

The glue application to the narrow surface of the workpiece W takes place by means of a glue application roller 15. The glue application roller 15 is provided centrally in the glueing unit: its longitudinal axis L _L lies in the extension of the longitudinal axis L _{K of} the cone 16. In the coupled state, the longitudinal axis L _{L of} the glue application roller 15 thus also in the extension of the longitudinal axis of the work spindle of the spindle unit 5 of the machining center.

The glue application roller 15 is thus set directly via the spindle unit 5 in rotation, without the provision of a separate drive would be provided.

The gluing unit is moved with the center of the glue application roller 15 by means of CNC technology around the workpiece contour. Due to the central arrangement of the glue application roller 15 in the glueing unit, the machining processes to be carried out with the glueing unit according to the invention are clearly programmable from a CNC technical point of view.

A glue container 14, in which liquid or liquefied glue 18 is located, is arranged in the lower region of the glue application roller 15. As will be described in more detail below, the glue 18 is transported from the glue container 14 by rotation of the glue application roller 15 in the upper region of the glue application roller 15 and applied there to the workpiece surface. By changing the distance between the workpiece narrow surface and the glue application roller 15, the glue application amount can be varied.

As also from the FIGS. 2 and 3 results, the edge K is brought by means of an edge feed device to the narrow surface of the workpiece W, which is formed in the present embodiment as Kantenzuführbahn 24. The edge K is under an edge feed angle α (s. FIG. 3 ) guided against the workpiece surface.

In the immediate vicinity of the position at which the edge K is guided to the workpiece W, a pressure roller 17 is provided, which presses the edge K to the glue-coated narrow surface of the workpiece W. The longitudinal axis L _{A of} the pressure roller 17 extends parallel to the longitudinal axis L _{L of} the glue application roller 15. A support arm 19 for the pressure roller 17 is rotatably mounted on the housing 13 of the gluing unit. Thus, the pressure roller 17 can pivot about the longitudinal axis L _{L of} the glue application roller 15 on the support arm 19 around. Depending on the workpiece contour and feed angle of the edge K, the pressure roller 17 pivots automatically.

By using the glue applicator roller 15 results in a more flexible applicability of the glueing unit. In particular, compared to a slot nozzle as a glue application element, no particular angle of attack of the glue application element with respect to the workpiece surface needs to be maintained, since the glue application roller 15 can pick up the glue around its entire circumference and transfer it to the workpiece surface. As a result, it is now also possible to vary the edge feed angle α with respect to the narrow workpiece surface and always to determine that the edge strip can always be optimally guided to the workpiece edge surface, even with complicated workpiece contours and small radii. Since for this purpose the relative position of the glue application roller 15 is not changed to the workpiece edge surface, there is always a uniform glue application.

The adjustment of the edge feed angle C is made by pivoting the edge feed path 24 with respect to the housing 13 about a separate pivot axis (C-axis).

FIG. 4 shows a plan view of the glue container 14 of the gluing unit according to the invention. By the rotation of the glue application roller 15 in this container 14, the glue 18 is conveyed in a semi-open guide tube 20 having a substantially semicircular cross-section along the glue applicator roll 15 upwards in the upper region where the glue is applied to the workpiece W.

The amount of glue on the glue application roller 15 can be determined by the distance between the guide tube 20 and the glue application roller 15 in the glue container 14.

Instead of the guide tube 20, a slider or a solid wall can be used.

FIG. 5 shows a plan view of the first embodiment of the gluing unit according to the invention, from which give more details of the structure of the glueing unit. It can also be seen here, the glue applicator roll 15, the guide tube 20 for the glue and the pressure roller 17 for pressing the edge K to the workpiece, not shown here. The glue application roller is provided centrally in the glue application unit. The edge feed path 24 is pivotable about the longitudinal axis of the glue application roller 15. Regardless of the pressure roller 17 is pivotally mounted about the same axis.

The glue 18 used is in solid form at ambient temperature, generally in the form of granules. For processing, the glue 18 must therefore be brought to a temperature above its melting temperature, usually to about 200 ° C. The thermal treatment of the glue 18 can take place in the storage location of the glueing unit, i. take place in the magazine assembly 9 and / or if the unit was selected.

FIG. 6 shows three possibilities for the thermal treatment of the glue 18. The heat can be generated directly, eg with heating cartridges (21 in FIG. 17 a), or indirectly, eg via a separate heating plate (22 in FIG. 17 b) or inductive (23 in FIG FIG. 17 c)). If the glue 18 is thermally processed directly in the gluing aggregate, then the above-described interface of the gluing aggregate is used to transfer the energy required for this purpose. The energy can be taken from the existing network or generated by means of its own generator.

The edge feed into the gluing unit can be done manually or automatically. In the simplest embodiment, the gluing unit according to the invention operates without own edge transport. The edge K to be applied is positioned in the region of the pressure roller 17 ( FIG. FIG. 7 ) and accordingly with the einsteuernden pressure roller 17 is pressed to the workpiece W, so that the rest of the edge band K is then automatically pulled out when driving around the workpiece contour.

Alternatively, it is possible to provide an additional edge transport. A correspondingly modified embodiment of the gluing unit according to the invention is shown in FIG FIG. 8 shown. This embodiment differs from the one described so far in that an edge transport device 26 and a cutting device 25 are provided. In addition, a sensor 27 for detecting the beginning of the A already applied to the workpiece W edge K is provided. This results in the possibility of completely bypassing the workpiece surface (360 °) and correspondingly cutting off the edge K at the end of the piecing process.

Both the transport device 26 and the cutting device 25 are pivotable together with the edge feed 24 about said axis C.

It follows from the above description that the gluing unit according to the invention can be designed as a simple, cost-effective gluing unit for four-sided Verieimung or as a more complex gluing unit for the 360 degree gluing of workpieces.

Furthermore, the glueing unit according to the invention can be used in various types of processing machines, such as e.g. Jib machines and gantries are used as a single unit or in combination with other units.

Claims (15)

1. Gluing unit for gluing an edge material (K) at a narrow surface of a panel-like workpiece (W) which consists in particular of wood or derived timber products, wherein the gluing unit has a housing (13), on which a glue application roller (15) is mounted for the application of glue (18) to the narrow surface of the workpiece (W), and wherein the gluing unit additionally can be coupled to a drive, by means of which the glue application roller (15) may be rotated, the glue application roller (15) is provided centrally in the gluing unit so that its longitudinal axis (L_L) lies in the extension of a drive axis of the drive, and the gluing unit comprises a glue container (14) to store the glue (18) to be applied, characterised in that the glue application roller (15) is mounted in the housing (13) at its one end and the other, free end of the glue application roller (15) is located in the glue container (14) so that the glue application roller is located in the glue (18) during operation.
2. Gluing unit according to claim 1, in which additionally an edge feed (24) for feeding the edge material (K) to be glued at the narrow surface of the workpiece (W) is mounted on the housing (13) and the edge feed (24) can be pivoted with respect to the horsing (13) about an axis (C) to change the entry angle (α) of the edge material (K) at the narrow surface of the workpiece (W).
3. Gluing unit according to claim 2, in which the edge feed (24) is provided in the form of a feed track.
4. Gluing unit according to claim 2 or 3, in which the axis (C) coincides with the longitudinal axis (L_L) of the glue application roller (15).
5. Gluing unit according to one of the preceding claims, further having a contact-pressure roller (17) which is provided behind the glue application roller (15) in the processing direction of the workpieces.
6. Gluing unit according to claim 5, in which the contact-pressure roller (17) is mounted with respect to the housing (13) to be pivotable about an axis which preferably coincides with the longitudinal axis (L_L) of the glue application roller.
7. Gluing unit according to claim 2 and one of claims 5 or 6, in which the longitudinal axis (L_A) of the contact-pressure roller (17) likewise runs parallel to the said axis (C).
8. Gluing unit according to claim 1, in which a guide device (20) is provided to convey the glue (18) by rotation of the glue application roller (15) out from the glue container (14) in the direction of the first end of the glue application roller (15) to a region in which the glue (18) is transferred by the glue application roller (15) onto the narrow surface of the workpiece.
9. Gluing unit according to one of the preceding claims, further having means (21, 22, 23) for heating the glue (18) to its operating temperature.
10. Gluing unit according to claim 2, further having a device (26) for transporting the edge material (K), which transport device (26) together with the edge feed (24) can be pivoted about the said axis C.
11. Gluing unit according to claim 2, further having a device (25) for cutting the edge material (K) into lengths, which length-cutting device (25) together with the edge feed (24) can be pivoted about the said axis C.
12. Gluing unit according to one of the preceding claims, wherein the gluing unit is coupled firmly to the drive.
13. Gluing unit according to one of the preceding claims for use in a processing centre for processing panel-like workpieces which consist in particular of wood or derived timber products, wherein the processing centre has a spindle unit (5) to receive processing tools and processing units and the gluing unit is designed so that it can be exchanged from a store (9) into the spindle unit (5) and can be coupled to the spindle unit (5) via an interface (16), and wherein the gluing unit is designed so that the longitudinal axis (L_L) of the glue application roller (15) in the exchanged state lies in the extension of the longitudinal axis of a working spindle mounted in the spindle unit (5).
14. Gluing unit according to claim 13, in which the gluing unit can be exchanged completely into the spindle unit (5).
15. Gluing unit according to one of the preceding claims, wherein the glue application roller is rotated directly via the spindle unit.

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