EP2277631B1 - Adhesive application device - Google Patents

Description

The invention relates to an adhesive application device for an edge banding machine for applying a molten adhesive on a narrow side of a continuously moving in a feed direction plate-shaped workpiece, comprising a nozzle body having a supply channel for molten adhesive with a mouth opening for applying the adhesive to the narrow side of the workpiece, and a delimiting the opening portion of the mouth opening in the vertical direction delimiting member, which is held vertically displaceable at the mouth opening and coupled to at least one scanning the workpiece top scanning element, wherein the at least one feeler member is designed as a follower roller.

Glue application devices of the type mentioned are from the generic publication DE-A-1 728 470 known. They are used in edgebanding machines with which a glue edge, which is often referred to as "edge band", fed to a parallel to the feed direction of the workpiece extending narrow side of the workpiece and can be glued to the workpiece. Subsequently, the workpiece with the lipping is usually fed to a post-processing in order to achieve a continuous transition between the upper and lower sides of the workpiece and the lipping.

For applying the adhesive on the narrow side of the edgebander an adhesive applicator of the type mentioned is used. It includes a nozzle body having a molten adhesive supply channel. The molten adhesive can be applied to the narrow side of the workpiece via the opening region of a mouth opening of the feed channel. The glue should if possible the narrow side completely overlap in the vertical direction and in the feed direction, that is, it should extend from the lower to the upper longitudinal edge of the workpiece over its entire length, so that after bonding of the edge band, neither at the workpiece top nor at the workpiece lower edge moisture in the area between the edge band and the narrow side can penetrate.

From the DE 40 12 726 A1 It is known to hold a limiting member displaceable at the mouth opening of the feed channel, with the aid of which the height of the opening region of the mouth opening can be adapted to the thickness of the workpiece, ie to the vertical extent of the narrow side of the workpiece. The limiting member is coupled to a feeler which scans the workpiece top. The feeler is at the out of the DE 40 12 726 A1 known adhesive application device in the form of a feeler slide, which slides along the workpiece top. The mouth opening of the feed channel is formed in the known adhesive application device by a plurality in a series of juxtaposed through holes, which are separated from each other by an opening-free intermediate region.

The from the DE 40 12 726 A1 Known adhesive applicator has been proven in practice for years. However, it would be desirable if the manufacture of the glue applicator could be simplified.

Object of the present invention is therefore to develop an adhesive applicator device of the type mentioned in such a way that it can be made easier to manufacture.

This object is achieved by an adhesive application device with the features of claim 1.

In the adhesive application device according to the invention, the mouth opening of the supply channel is designed in the form of a slot. This has the advantage that the mouth opening can be made easier to manufacture. In addition, the slot-shaped configuration of the mouth opening facilitates their cleaning. In addition, the design of the mouth opening in the form of an orifice slot allows the vertical extent of the opening region of the mouth opening to be adapted exactly to the height of the narrow side. As a result, the adhesive can be applied exactly to the level of the upper edge of the workpiece on the narrow side, 'without the risk that at the edge of the narrow side only an insufficient amount of adhesive is available.

In a preferred embodiment of the adhesive application device according to the invention, an orifice slot is used, over the opening region of which adhesive can be applied very uniformly directly onto the narrow side. The extent of the opening region in the vertical direction can be predetermined by the limiting member, which is coupled to at least one sensing roller. The limiting member has a slot delimiting section which dips into the outlet slot and completely fills the outlet slot in its dipping region and whose position in the vertical direction is predetermined by the at least one sensing roller which scans the workpiece upper side of the continuously moving workpiece. The slot limiting portion therefore occupies a position at the upper edge of the workpiece, so that the vertical extent of the opening portion of the mouth slot exactly corresponds to the vertical extent of the narrow side of the workpiece. The adhesive can therefore be applied to the entire narrow side, even if the height of the narrow side varies over the length of the workpiece. It there is no danger that too little adhesive is applied, especially in the area of the upper edge of the workpiece, nor is there the risk that too much glue will be applied and glue will get onto the top of the workpiece. The workpiece top is consequently not affected by the adhesive. The feeler roller detects the workpiece top side, while it rolls on the workpiece top. It therefore constantly adapts to the position of the workpiece top without sliding along the top of the workpiece and possibly adversely affecting it. Rather, it rolls off with a very low coefficient of friction on the workpiece top. The adhesive application device according to the invention thus also has the advantage that molten adhesive can be applied exactly over the entire narrow side of the workpiece, without the workpiece top being impaired.

The limiting member has a sealing edge which can be applied to the workpiece top edge. The sealing edge can connect to the slot limiting section transversely to the feed direction. It can be applied to the upper longitudinal edge of the workpiece. The region of the narrow side of the workpiece to be applied to the adhesive is thus sealed particularly reliable against the workpiece top. The workpiece top is not affected, since the sealing edge of the limiting member only touches a very narrow area on the workpiece top edge, but does not represent a large-scale system. In particular, it can be provided that the sealing edge only touches the workpiece linearly.

Conveniently, a squeegee with a plurality of grooves extending parallel to the feed direction adjoins the orifice slot in the feed direction. As a result, the adhesive applied to the narrow side can be structured.

It is advantageous if in the feed channel a vertically adjustable metering rod is arranged with an axial blind bore, the molten adhesive can be fed and which is connected via a vertical metering slot with the mouth slot. In such an embodiment, a dosing rod is slidably held in the supply channel. About the dosing rod molten adhesive can be supplied to the mouth slot. For this purpose points the Dosierstab an axial blind hole, which opens via a vertical metering slot in the mouth slot of the nozzle body. The position of the dosing rod in the vertical direction can be adjusted. For this purpose, it may be provided, for example, that the dosing rod is connected via a linkage to an upper part of the edge banding machine. The position of the dosing rod can thus be adjusted together with the upper part to the maximum thickness of the workpiece, ie to the maximum extent of the workpiece in the vertical direction. At the top of the edgebander transport members, such as transport rollers or belts are usually arranged, which move in combination with transport members, which are arranged on the lower part of the edge banding machine, the workpiece in the feed direction. For this purpose, the position of the upper part is adapted to the maximum thickness of the workpiece, and by the coupling of the Dosierstabs on the linkage to the upper part is also an adjustment of the metering. The dosing rod can be kept adjustable on the linkage so that it can be adjusted relative to the linkage and consequently also relative to the upper part of the edge banding machine.

It can be provided that the dosing rod is rotatable about a longitudinal axis of the supply channel. As a result, the dosing slot can be swiveled back and forth in a simple manner between an open position in which it curses with the orifice slot of the nozzle body and a closed position in which it is arranged offset relative to the orifice. As a result, the application of adhesive can be controlled in a simple manner.

It is favorable if the metering slot has at least the same width in the feed direction as the mouth slot. The mouth slot can be fed over its entire width adhesive, which then on the opening area of the mouth slot on the narrow side of the workpiece is applied. Thereby, the uniformity of the adhesive application can be improved.

In an advantageous embodiment, the mouth slot of the nozzle body extends in the vertical direction upwards beyond the metering slot of the metering rod. In particular, it may be provided that the mouth slot extends beyond the workpiece upper edge. This facilitates the production of the orifice slot. Although the mouth slot extends far upward, there is no risk of adhesive getting onto the workpiece top, because in the vertical direction, the opening area of the mouth slot is restricted by the slit-limiting portion of the restriction member slidably disposed in the mouth slot in the vertical direction. Glue can escape from the nozzle body only in the opening area of the orifice slot. The opening area is arranged below the slot delimiting section. The position of the slot limiting section is, as explained above, predetermined by the position of the feeler roller, which scans the workpiece top.

It can be provided that the metering slot of the metering rod extends in a vertical direction downwards beyond the outlet slot. A portion of the metering slot may thus extend below the mouth slot. This area is covered by the metering body, so that there is no risk that adhesive can escape from the metering slot in this area.

In an advantageous embodiment of the invention, the limiting member has a first and a second holding arm, which project away from a central part and on each of which at least one sensing roller is freely rotatably mounted. In such an embodiment, the Glue application device on at least two scanning rollers, each scanning the workpiece top and are arranged in the feed direction one behind the other. They are each freely rotatably mounted on a holding arm of the limiting member, and the holding arms are connected to a central part of the limiting member, on which the dipping into the mouth slot of the nozzle body slot limiting portion is held.

It can be provided that the two retaining arms and the central part are designed in the form of a one-piece component.

Additionally or alternatively, it can be provided that the central part and the slot limiting section are integrally connected to each other.

Conveniently, the limiting member is acted upon by a vertically downward restoring force. It can be provided, for example, that a compression spring or the cylinder of a piston-cylinder unit acts on the limiting member and the limiting member against the resilient restoring force is vertically displaced upwards.

In an advantageous embodiment, the sealing edge of the limiting member is arranged in the vertical direction at the level of a rolling on the workpiece top rolling surface of the at least one sensing roller or lower than the rolling surface. This ensures that the workpiece thickness is detected by the at least one sensing roller following the limiting member including the sealing edge. The control or guidance of the limiting member in the vertical direction is thus effected by the at least one sensing roller. On the other hand, the sealing edge serves to reliably prevent an application of adhesive to the workpiece top side.

Preferably, the sealing edge extends in the feed direction of the workpiece beyond the width of the mouth slot.

If there is a squeegee in the feed direction to the orifice slot, it is advantageous if the sealing edge extends over the entire length of the squeegee.

Conveniently, the at least one sensing roller is adjustably held in the vertical direction on the limiting member. This gives the possibility to adjust the position of the follower roller. In particular, this allows the position of the sensing roller to be adjusted relative to the sealing edge.

It is advantageous if the at least one sensing roller is held by means of an eccentric adjustable on the limiting member. Such eccentric devices are known per se to the person skilled in the art. With their help, the Rotary axis of the follower roller can be adjusted in a particularly simple manner in the vertical direction.

The limiting member comprises in a preferred embodiment, a lower boundary surface, which is arranged above the workpiece top. It is advantageous if the lower boundary surface is inclined to the workpiece top. The lower boundary surface may adjoin the sealing edge of the limiting member in the direction away from the slot limiting section.

Figur 1:

eine perspektivische Darstellung einer erfindungsgemäßen Kleberauftragsvorrichtung;

Figur 2:

eine Vorderansicht der Kleberauftragsvorrichtung aus Figur 1;

Figur 3:

eine Schnittansicht der Kleberauftragsvorrichtung entlang der Linie 3-3 in Figur 2 und

Figur 4.

eine Schnittansicht der Kleberauftragsvorrichtung entlang der Linie 4-4 aus Figur 3.

The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:

FIG. 1:

a perspective view of an adhesive application device according to the invention;

FIG. 2:

a front view of the glue applicator FIG. 1 ;

FIG. 3:

a sectional view of the adhesive applicator along the line 3-3 in FIG. 2 and

FIG. 4.

a sectional view of the adhesive applicator along the line 4-4 FIG. 3 ,

In the drawing, an adhesive application device 10 is shown schematically for an edge banding machine. The edgebander is not shown in the drawing as it is known per se to a person skilled in the art. It has in the usual way a machine head and a machine base. The Machine base includes a frame and various processing units such as saws, milling and the like. The machine head is kept adjustable relative to the machine base in the vertical direction. On the machine head and the machine base are transport members, for example transport rollers stored, with the aid of a plate-shaped workpiece 12 in a feed direction 14 can be moved continuously. The workpiece 12 has an end face 16 and a bottom 17 and a top 18. In addition, the workpiece 12 includes a front narrow side 20 and a rear narrow side 21. As explained in more detail below, by means of the adhesive application device 10, a molten adhesive on the front narrow side 20 are applied.

The adhesive application device 10 comprises a nozzle body 22 with a feed channel 24 running in the vertical direction, in which a metering rod 26 is held adjustably in the vertical direction. With a lower end portion 28 of the dosing rod 26 dips in a conventional manner in a not shown in the drawing, known in the art adhesive container of the Kantenanleimaschine, and with an upper end portion 30 of the metering rod in the vertical direction is adjustably held on a linkage 32 , The linkage 32 is fixed to the machine head of the edge bander known per se to those skilled in the art. The dosing rod 26 can thus be adjusted in the vertical direction relative to the nozzle body 22.

The metering rod 26 comprises an axial blind bore 34, which is of the in FIG. 1 shown lower end 35 of the Dosierstabs 26 goes out and extends to the level of the nozzle body 22. In the area of the nozzle body 22, a lateral metering slot 36 adjoins the blind bore 34, which passes through the wall of the metering rod 26 and extends in the vertical direction.

The nozzle body 22 comprises an orifice slot 38 which extends in the vertical direction and extends from an end surface 39 arranged at the level of the lower longitudinal edge 40 of the workpiece 12 beyond the upper longitudinal edge 41 of the workpiece 12 to approximately the upper side 42 of the nozzle body 22. The upper side 42 faces away from the upper side 18 of the workpiece 12. The front narrow side 20 of the workpiece 12 extends from the lower longitudinal edge 40 to the upper longitudinal edge 41 and is thus covered by the orifice slot 38.

In the mouth slot 38, a limiting member 44 with a slot limiting portion 46 is immersed. The slot limiting portion 46 is formed in the form of a nose or rib which protrudes from a central part 48 of the limiting member 44 in the horizontal direction and transversely to the feed direction 14 of the workpiece 12. In its dipping into the mouth slot 38 area of the slot limiting portion 46 fills the mouth slot 38 completely. For this purpose, the width of the slot-limiting section 46 in the feed direction 14 and the depth of the slot-limiting section 46 are adapted transversely to the feed direction 14 to the width or depth of the orifice slot 38.

The central part 48 is integrally connected to a first support arm 50 and a second support arm 52 which project in the feed direction 14 in alignment with each other and facing away from the central part 48. At their free end regions, the two holding arms 50 and 52 carry a first sensing roller 54 and a second sensing roller 56, which are freely rotatably mounted on the holding arms 50, 52.

The limiting member 44 is fixed to a guide rod 58, which is held against a resilient restoring force, which is exerted by a compression spring 60, displaceable in the vertical direction on the linkage 32.

The slot limiting section 46 is held displaceably in the outlet slot 38 of the metering body 22 in the vertical direction. The opening portion 64 extends from the end face 39 of the orifice slot 38 to the lower end face 62 of the slot delimiting portion 46. Via the opening portion 64, molten adhesive can be applied to the front narrow side 20 of the slot Workpiece 12 are applied. For this purpose, the metering rod 26 is adjusted in the vertical direction such that the metering slot 36 covers the opening region 64. This is going out FIG. 4 clear. Thus, molten adhesive can be applied via the blind bore 34, the metering slot 36 and the opening portion 64 of the orifice slot 38 on the front narrow side 20.

Transverse to the feed direction 14, the lower end face 62 of the slot delimiting section 46 is adjoined by a lower boundary surface 66 of the central part 48 of the limiting member 44 that is inclined to the workpiece upper side 18. The transition from the end face 62 to the boundary surface 66 via a sealing edge 67 of the limiting member 44. The sealing edge 67 contacts the workpiece 12 at its upper longitudinal edge 41. From the opening portion 64 of the orifice slot 38 leaking adhesive can not therefore on the top 18 of the workpiece 12th reach.

The sensing rollers 54 and 56 are respectively mounted by means of an eccentric means 68 and 70 on the respective holding arm 50 and 52 and can be adjusted with the eccentric means 68 and 70 in the vertical direction. This gives the possibility to adjust the feeler rollers 54 and 56 relative to the sealing edge 67. For example, it can be provided that the contact rollers 54 and 56 are positioned exactly at the level of the sealing edge 67 or approximately deeper than the sealing edge 67 with their surface 18 of the workpiece 12 scanning the rolling surface 72 and 74.

As in particular from FIG. 1 becomes clear, joins the muzzle slot 38 in the feed direction 14, a doctor blade 76 with a plurality of parallel to the feed direction 14 extending grooves 78 at. The sealing edge 67 extends in the feed direction 14 over the entire length of the doctor 76.

As in particular from FIG. 4 becomes clear, the metering rod 26 can be adjusted so that the metering slot 36 extends slightly beyond the upper longitudinal edge 41 of the workpiece 12 in the vertical direction. This ensures that the molten adhesive can be uniformly supplied to the opening region 64 over its entire vertical extent.

It can be provided that the dosing rod 26 is rotatable about a longitudinal axis of the feed channel 24. This provides the ability to pivot the metering slot 36 back and forth between an open position and a closed position to control the application of molten adhesive. In its open position, as in FIG. 4 is shown, the metering slot 36 is aligned with the mouth slot 38 of the dosing, whereas it is arranged offset in its closed position to the mouth slot 38 by a pivot angle of, for example, 15 ° to 30 °. The closed position of the dosing rod 26 is not shown in the drawing.

The workpiece 12 is guided along by the feed members of the edge banding machine, not shown in the drawing, in the feed direction 14 on the orifice slot 38, so that molten adhesive can be continuously applied to the front narrow side 20 of the workpiece 12. The adhesive can exit the nozzle body 22 via the opening region 64. The vertical extension of the opening region 64 is predetermined by the slot limiting section 46, which is coupled to the scanning of the workpiece top 18 sensing rollers 54 and 56. Thus, the lower end edge 62 of the slot limiting section 46 can be aligned exactly at the level of the upper side 18 of the workpiece 12. Via the contact rollers 54 and 56, the slot limiting section 46 can follow all unevenness of the upper side 18, so that the opening region 64 of the orifice slot 38 can be adapted exactly to the changes in the workpiece thickness.

By means of the adhesive application device 10 can thus be applied to the entire narrow side 20, starting from the lower longitudinal edge 40 of the workpiece 12 to its upper longitudinal edge 41, evenly molten adhesive, on the one hand ensures that the adhesive comes up to the upper longitudinal edge 41 and on the other hand it is ensured that the adhesive can not reach the upper side 18 of the workpiece.

Claims (12)

1. An adhesive application device for an edge-banding machine for the application of a molten adhesive to a narrow side (20) of a plate-shaped workpiece (12) continuously moved in a feed direction (14), comprising a nozzle body (22), which has a feed channel (24) for molten adhesive with a mouth opening for the application of the adhesive to the narrow side (20), as well as comprising a limiting member (44), limiting the opening region of the mouth opening in a vertical direction, which is held at the mouth opening in a vertically displaceable manner and which is coupled to at least one feeler member provided for feeling the workpiece upper side (18), wherein the at least one feeler member is in the form of a feeler roll (54, 56), characterised in that the mouth opening is in the form of a mouth slot (38) into which the limiting member (44) extends with a slot limiting portion (46) whose width in the feed direction (14) corresponds to the width of the mouth slot (38), and in that the limiting member (44) has a sealing edge (67) which can be placed against the workpiece upper edge (41).
2. An adhesive application device according to claim 1, characterised in that a spreading knife (76) immediately follows the mouth slot (38) in the feed direction (14).
3. An adhesive application device according to claim 1 or 2, characterised in that in the feed channel (24) there is arranged a metering rod (26), adjustable in a vertical direction, with an axial blind bore (34) to which molten adhesive can be fed and which is connected to the mouth slot (38) via a vertical metering slot (36).
4. An adhesive application device according to claim 3, characterised in that the metering slot (36) has at least the same width in the feed direction (14) as the mouth slot (38).
5. An adhesive application device according to claim 3 or 4, characterised in that the mouth slot (38) extends upwards beyond the metering slot (36) in a vertical direction.
6. An adhesive application device according to claim 3, 4 or 5, characterised in that the mouth slot (38) is provided to extend upwards to beyond the workpiece upper edge (41) in a vertical direction.
7. An adhesive application device according to any one of claims 3 to 6, characterised in that the metering slot (3 6) extends downwards beyond the mouth slot (38) in a vertical direction.
8. An adhesive application device according to any one of the preceding claims, characterised in that the limiting member (44) has a first and a second holding arm (50, 52) which protrude, facing away from one another, from a central part (48) and on which in each case there is mounted at least one feeler roll (54, 56) in a freely rotatable manner.
9. An adhesive application device according to any one of the preceding claims, characterised in that the sealing edge (67) is in a vertical direction arranged level with a rolling surface (74), provided to roll on the workpiece upper side (18), of the at least one feeler roll (54, 56) or lower than the rolling surface (74).
10. An adhesive application device according to any one of the preceding claims, characterised in that the at least one feeler roll (54, 56) is held on the limiting member (44) so as to be adjustable in a vertical direction.
11. An adhesive application device according to any one of the preceding claims, characterised in that the at least one feeler roll (54, 56) is held on the limiting member (44) in an adjustable manner by means of an eccentric device (68, 70).
12. An adhesive application device according to any one of the preceding claims, characterised in that the limiting member (44) has a lower limiting surface inclined with respect to the workpiece upper side (18).

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