Glue distributing apparatus

Description

[0001] The present invention relates to a glue distributing apparatus, in particular an apparatus for distributing glue in a woodworking machine, such as for example an edgebanding machine or a squaring edgebanding machine.

[0002] Such machines, which typically perform edgebanding operations on panels, tables, flat elements of wood or similar material, comprise glue distributing apparatuses or gluing units that deposit or spread a layer of adhesive glue on belts, strips, beads to be applied to edges of panels, or directly to the edges of said panels.

[0003] The adhesive used is generally a hot-melt glue that has to be appropriately heated before being applied "hot" to surfaces to be joined. The glue is applied by means of a suitable rotating gluing roller, that has a knurled or rough external surface, which retains and conveys the glue, supplied by a tank or pot. The latter is made of a non-adhering material and is provided with heating elements, such as electric resistances, for uniformly heating and keeping fluid the glue.

[0004] In some gluing units the glue tank is positioned below a work area and suitable supplying means, for example screw conveyor, transfers the glue from said lower tank to the gluing roller.

[0005] However, such apparatuses have the drawback of heating the work area excessively, as the tank with heat resistances is placed in a position that is such as not to allow produced heat to be dissipates, so that it diffuses to the adjacent areas and particularly upwards, at the gluing roller.

[0006] In order to overcome this serious drawback, which may cause malfunction or even breakage of mechanical members of the apparatus, glue distributing apparatuses are known that are provided with glue tanks positioned next to the gluing roller and which extend upwards. In this way the heat generated by the tank resistances can be dissipated to the external environment and does not affect, unless marginally, the work area and in particular the roller and the corresponding movement members.

[0007] The tank has a lower portion or chamber provided with an opening through which the glue flows by force of gravity to the gluing roller. The latter partially shuts said opening and, by rotating, transfers and spread the glue on the surfaces of the elements to be joined.

[0008] Within the lower chamber, interposed between the roller and the opening, glue adjusting means is generally provided comprising fixed doctor blades for adjusting the quantity of glue to be spread onto the knurled surface of the gluing roller.

[0009] In particular, these apparatuses can comprise a first doctor blade, called dosing doctor blade, for depositing or spreading an uniform layer of glue of a fixed thickness on the gluing roller, and a second doctor blade, called return or recovery doctor blade, which recovers the exceeding glue on the roller that has not been transferred to the surface to be glued. The return doctor blade moreover keeps any foreign bodies outside the chamber.

[0010] The doctor blades are arranged parallel to one another at a preset distance, opposite the opening of the lower chamber of the tank in such a way as to form a cavity in which the glue gathers that is taken from the roller.

[0011] Each doctor blade comprises an elongated flat element, provided with an edge abutting on the gluing roller along a generatrix thereof, operating substantially as a "spatula" to spread a uniform layer of glue on said roller.

[0012] Alternatively, each doctor blade may consist of a cylindrical pivot, arranged parallel to the gluing roller and provided with a longitudinal plane that constitutes a flat surface that conveys and spreads the glue on the roller.

[0013] The presence of two distinct doctor blades requires laborious and complex management of the apparatus since adjusting operations for correctly positioning and orienting doctor blades with respect to the roller must be repeated separately for each doctor blade and need skilled operators and also long stops of the machine. The gluing roller can, in fact, rotate both in a clockwise and in an anticlockwise direction, according to whether, for example, strips or belts have to be glued, in the case of so-called "softforming", or panels to be edgebanded have to be glued, in the case of so-called "straight" forming.

[0014] By changing the rotation direction of the roller it is required to replace and/or to separately adjust the two doctor blades that change function and have to be correctly positioned and orientated with respect to the roller.

[0015] The doctor blades, because their shape and arrangement, form in the lower chamber of the tank a cavity inside which the rotation of the gluing roller causes the formation of turbulence and vortices in the liquid glue contained therein. Such a turbulent flow causes an uneven distribution of the glue on the roller since said glue is distributed in a nonuniform manner along the height of roller.

[0016] In fact, it has been observed that on a top portion of the roller a quantity of glue is deposited that is less than that which is deposited on the lower part. This causes an irregular gluing since a glue layer with an uneven thickness is applied to surfaces to be glued.

[0017] Turbulent flow and vortices in the liquid glue intensify as rotation speed of gluing roller increases, for example if it is necessary to spread glue on rapidly moving parts, typically in squaring edgebanding machines that machine straight panels in line, with high rectilinear movement speeds. This drawback of known glue distributing apparatuses often forces to reduce a production speed of the machines.

[0018] Another drawback of the known distributing apparatuses consists in glue leakages occurring especially during stop periods of said apparatuses. In fact, as the gluing roller has a knurled or rough external surface, the doctor blades are unable to provide a wet seal abutment for this surface and thus to close hermetically the lower chamber of the glue tank.

[0019] During apparatus operation, a roller rotation provides a dynamic seal between the external surface of the roller and the doctor blades. Nevertheless, during stop periods, in absence of a dynamic seal there is a glue leakage which varies according to glue fluidity, pressure inside the tank, shape and dimensions of the lower chamber opening, etc.

[0020] Glue leakage is a serious drawback, both from a financial point of view, as said hot-melt glue is very expensive, and because of problems that the glue may create by spreading and solidifying in the work area.

[0021] DE 3447592 discloses a device for applying hot-melt adhesive to continuously moved workpieces. The device is provided with a tank for containing the hot-melt adhesive. The tank comprises a portion in which an application roller, which is arranged for applying the hot-melt adhesive to the workpieces, is rotatably supported around a vertical axis. The tank further comprises a gap through which the application roller protrudes with a portion of its periphery for contacting a workpiece. The device further comprises two dosing valves positioned inside the tank on opposite sides of the application roller, the dosing valves being interposed between the portion and the gap.

[0022] EP 0945235 discloses an edge banding device for edge banding panels. The edge banding device comprises means for applying an edge band to a panel, such means consisting of a motor-driven shaft which mounts and drives a roller arranged for contacting an edge of the panel. The edge banding device further comprises means for feeding glue to the roller. This means consists of a tank for containing the glue and a pair of dosing cylinders interposed between an opening of the tank and the roller.

[0023] DE 20104698 discloses a glue tank for an edge gluing machine. The glue tank comprises an inner space leading outwards via an outlet slot. The glue tank further comprises an application roller which is positioned in front of the outlet slot. Further, the glue tank is provided with a rotatable dosing rod positioned between the application roller and the outlet slot.

[0024] An object of the invention is to improve known glue distributing apparatuses, in particular for woodworking machines for machining elements of wood or similar materials. Another object is to obtain a glue distributing apparatus that enables a uniform and homogenous distribution of glue on a gluing roller for the entire length thereof.

[0025] A further object is to obtain a glue distributing apparatus that is free of glue leakages both in operating conditions and in stop conditions.

[0026] Still another object is to obtain a glue distributing apparatus, which allows adjusting and controlling in a simple, fast and effective manner the glue to be spread on surfaces to be glued, regardless of a rotation direction of gluing roller.

[0027] In the invention there is provided a glue distributing apparatus as defined in claim 1.

[0028] Owing to the invention it is possible to obtain a glue distributing apparatus that is free of glue leakages during operation and, above all, during stop periods. The shutting means is able, in fact, to hermetically close the opening of tank means, thus preventing the glue from reaching the roller means and to leak through passages and openings on a knurled surface of said roller means.

[0029] The invention can be better understood and carried into effect with reference to the attached drawings in which some embodiments are shown by way of non-limiting example, in which:

Figure 1 is a schematic partial section, taken along a longitudinal plane, of an explanatory example of a glue distributing apparatus not part of the invention;

Figure 2 and 3 are schematic partial sections, taken along a plane II-II of Figure 1, showing doctor blade means in respective different working positions;

Figure 4 is a schematic partial section taken along a longitudinal plane, of a version of the apparatus of the invention;

Figures 5 and 6 are schematic partial sections, taken along a plane V-V of Figure 4, showing doctor blade means in respective different working positions and shutting means in an open position;

Figure 7 is a section like the one in Figure 6, wherein shutting means is in a closed position.

[0030] With reference to Figures 1 to 3, there is schematically shown a glue distributing apparatus comprising roller means 2, tank means 3 and adjusting means 4.

[0031] Roller means 2 comprises a rotating roller, of known type, having a rough or knurled external surface 2a for removing, conveying and applying a preset layer of glue to an element 50 to be glued.

[0032] The roller 2 is rotated by suitable actuating means, of known type and not shown in the Figures, and it can be rotate both clockwise and anticlockwise, depending on elements 50 to be glued. For example, the roller 2 rotates clockwise to glue strips or belts in the so-called "softforming" process, whilst it rotates anticlockwise to glue edges of panels or tables to be edgebanded, in the so-called "straight" process. Tank means 3, which contains the glue and is placed next to the roller means 2, extends upwards and is provided with an opening 3a for conveying said glue to the roller means 2. The tank means 3 is further provided with a plurality of electric heating elements 23 that are able to heat and melt uniformly the glue and to maintain fluid the latter.

[0033] The opening 3a of tank means 3 has a height that is almost the same as that of a portion of the roller 2 configured for receiving the glue.

[0034] Adjusting means 4 is interposed between the roller means 2 and the opening 3a for regulating a quantity of glue transferred to the roller 2 for a subsequent application on an element 50 to be glued. Adjusting means 4 is further configured so as to recover from the roller 2 the exceeding glue, which has not been spread on element 50.

[0035] Adjusting means 4 comprises doctor blade means 5, 6 provided with respective cavity means 5a, 6a. Doctor blade means comprise a first doctor blade 5 and a second doctor blade 6.

[0036] Each doctor blade 5, 6 is an element with a longitudinally elongated shape, for example a pin with an approximately cylindrical section, on which a respective cavity 5a, 6a is made, consisting of an open hollow space that extends longitudinally for about the entire length of the element. The cavity 5a, 6a is for example a straight groove with a U-shaped cross section having a concave bottom wall.

[0037] The two doctor blade 5, 6 are arranged parallel each other and spaced apart from one another in such a way that the respective cavities 5a, 6a are almost face one another to form a volume or space 7 that is shaped for containing the glue.

[0038] It has been find out that such cavities 5a, 6a reduce and limit considerably the formation of turbulences and vortices in the liquid glue during rotation of roller 2. This enables an almost uniform and homogenous distribution of the glue on the whole length of roller 2 to be obtained, regardless of a rotation speed of roller 2.

[0039] Each doctor blade 5, 6 comprises an abutting portion 5b, 6b, configured so as to contact the roller 2, and a sealing portion 5c, 6c suitable for abutting on a respective seat 3b, 3c of tank means 3.

[0040] With reference to Figures 2 and 3, the abutting portion 5b, 6b is, for example, an edge made on an external surface of the doctor blade, whilst the sealing portion 5c, 6c is a portion of said external surface, having a concave shape, complementary to a shape of seat 3b, 3c, for example a portion of cylindrical surface.

[0041] Each doctor blade 5, 6 is rotatably mounted around a respective rotation axis 5d, 6d, so as to be movable between a first working position A and a respective second working position B. Said rotation axes 5d, 6d are parallel to one another and also parallel to a rotation shaft 8 of roller 2.

[0042] In the first working position A, the abutting portion 5b, 6b of the doctor blade 5, 6 substantially abuts on the external surface 2a of the roller 2 in such a way as to adjust the passage of glue to be deposited onto the roller and to uniformly extend said glue onto said outside surface 2a.

[0043] In the second working position B the abutting portion 5b, 6b of doctor blade 5, 6 is spaced from a respective external surface 2a of roller 2 to enable the exceeding glue on the roller 2 to be recovered and at the same time to prevent possible foreign bodies entering the volume 7.

[0044] Driving means, of known type and not shown in the Figures, is provided for rotating the doctor blades 5, 6 between the two working positions.

[0045] The doctor blades 5, 6 can be mounted so as to independently rotate, driven separately by respective driving means.

[0046] Alternatively, the doctor blades 5, 6 can be mounted linked together and connected by suitable interconnecting means, in such a way as to rotate together. Said interconnecting means can be of mechanical type, for example pulley or gear mechanisms, or of electronic type, for example electronic control means of actuating means.

[0047] When the doctor blades 5, 6 are interconnected, a rotation of a doctor blade is matched by a same rotation of the other doctor blade. More specifically and with reference to Figures 2 and 3, when for example the first doctor blade 5 is in the respective first working position A, the second doctor blade 6 is in the respective second working position B. In this case, the apparatus 1 is in a first operating configuration P in which the roller 2 rotates in an anticlockwise direction, for example to apply glue to an edge of a panel 50.

[0048] Rotation of first doctor blade 5 in the respective second working position B coincides with rotation of second doctor blade 6 in the respective first working position A. In this case, the apparatus 1 is in a second operating configuration Q wherein the roller 2 rotates in a clockwise direction, for example to apply glue to a strip or belt 50.

[0049] The doctor blade 5, 6 can also be made as a single body. In this case, the respective rotation axes 5d, 6d are coincident.

[0050] Figures 4 to 7 show a version of the apparatus 1 which comprises shutting means 10, that is movable and interposed between the roller 2 and the opening 3a of the tank means 3 for closing and/or opening said opening 3a.

[0051] In particular, shutting means 10 are inserted between the adjusting means 4 and said opening 3a.

[0052] Shutting means 10 is movable between a closed position C, in which it shuts said opening 3a to prevent the glue passing from the tank means 3 to the roller 2 (Figure 7), and a complete open position D, in which it opens said opening 3a and enables the glue to pass through (Figures 5, 6).

[0053] In an intermediate position, which is not illustrated in Figures, the shutting means 10 can adjust a glue flow to the roller 2, partially closing the opening 3a.

[0054] Shutting means 10 comprises an elongated element, substantially cylindrical, rotatably mounted on a rotating pin 11.

[0055] Shutting means 10 further has a passage 12 comprising a longitudinal through opening that enables the glue to transit and which has a length that is almost equal to a height of the opening 3a.

[0056] Shutting means 10 is contained in a suitable respective seat 3d made in the tank means 3, inside which it can rotate.

[0057] In this version of the apparatus 1, the adjusting means 4 comprises a couple of doctor blades 15, 16 made of a single body and rotatable around respective rotation axes 15d, 16d that in this case coincide.

[0058] More precisely, the adjusting means 4 comprises an elongated tubular element 19 that is substantially cylindrical with open section, provided with two facing and opposite portions 15, 16 acting as doctor blades.

[0059] Each doctor blade 15, 16 has a respective abutting portion 15b, 16b, configured so as to abut on the external surface 2a of the roller 2, and a respective sealing portion 15c, 16c configured so as to abut on said respective seat 3d of tank means 3.

[0060] As shown in Figures 5 and 6, it is sufficient to rotate the tubular body 19 of the adjusting means 4 in order to position the two doctor blades 15, 16 at the same time and with precision in the respective working positions. In particular, when the apparatus 1 is in a first operating configuration P, the first doctor blade 15 is in a respective first working position, i.e. substantially abutting on the roller 2 to adjust a glue passage on the roller, and the second doctor blade 16 is in a respective second working position, i.e. spaced from the roller 2 to enable the exceeding glue to be recovered. On the other hand, when the apparatus 1 is in a second operating configuration Q, the first doctor blade 15 is in a respective second working position and the second doctor blade 16 is in a respective first working position.

[0061] The tubular body 19 of the adjusting means 4 has an internal cylindrical cavity 17 into which the shutting means 10 is inserted coaxially.

[0062] There is further provided a through slot 18, made on a wall of said tubular element 19 and facing said abutting edges 15b, 16b. Glue coming from the tank means 3 can pass through the slot 18 to reach roller means 2.

[0063] This version of the distributing apparatus 1 thus comprises adjusting means 4 and shutting means 10 in a very compact structure.

[0064] Adjusting means 4 that comprises two doctor blades 15, 16, that are integral and movable at the same time, allows adjusting and controlling in a simple, rapid and effective manner a distribution of the glue on surfaces to be glue, regardless of a rotation direction of the roller 2.

[0065] At the same time, shutting means 10 can close hermetically the opening 3a, thus preventing glue from reaching the roller 2 and leaking through passages and openings of the external surface 2a of said roller during stop phases of the apparatus.

[0066] Shutting means 10 comprises a couple of recesses 13, 14, made on an internal wall of the passage 12 for an entire extent of the latter.

[0067] Recesses 13, 14 are substantially the same and symmetrically arranged with respect to a longitudinal plane of symmetry S of shutting means 4. In particular, said recesses 13, 14, which have an almost U-shaped section, are arranged so as to form a respective cavity 20 converging on roller means 2.

[0068] By means of recesses 13, 14 it is possible to reduce considerably the formation of turbulences or vortices in the liquid glue during the rotation of roller 2, so as to obtain an almost uniform and homogenous distribution of glue on the entire length of the roller 2, regardless of speed rotation thereof.

[0069] In a further version of the apparatus 1 not shown in Figures, respective cavities can be provided on the walls of the tubular body 19 of adjusting means 4 at the doctor blades 15, 16.

Claims

1. Glue distributing apparatus comprising roller means (2) for applying a glue to an element to be glued (50), tank means (3) containing said glue and provided with an opening (3a) for conveying said glue to said roller means (2), characterised in that it comprises adjusting means (4) interposed between said roller means (2) and said opening (3a) for regulating a quantity of glue transferred to said roller means (2) for a subsequent application on an element (50) to be glued, and further comprises shutting means (10), interposed between said adjusting means (4) and said opening (3a) and movable between a closed position (C), wherein said shutting means (10) closes said opening (3a) to prevent a passage of said glue from said tank means (3) to said roller means (2), and an open position (D), wherein said shutting means (10) opens said opening (3a) to enable a passage of said glue.

2. Apparatus according to claim 1, wherein said shutting means (10) is rotatably mounted around a rotating pin (11).

3. Apparatus according to claim 1 or 2, wherein said shutting means (10) comprises an elongated element, in particular a substantially cylindrical pivot.

4. Apparatus according to any one of claims 1 to 3, wherein said shutting means (10) comprises a passage (12) enabling a passage of said glue between said tank means (3) and said roller means (2).

5. Apparatus according to any one of claims 1 to 4, wherein said tank means (3) comprises a housing (3d) for receiving said shutting means (10).

6. Apparatus according to any one of claims 1 to 5, wherein said adjusting means (4) adjusts a quantity of glue transferred to and from said roller means (2).

7. Apparatus according to claim 6, wherein said adjusting means (4) is interposed between said roller means (2) and said shutting means (10).

8. Apparatus according to claim 6 or 7, wherein said adjusting means (4) comprises doctor blade means (5, 6; 15, 16).

9. Apparatus according to claim 8, wherein said doctor blade means (5, 6; 15, 16) is mounted movably in such a way as to be movable between a respective first working position (A), for regulating a passage of glue to be spread on said roller means (2), and a respective second working position (B), for recovering exceeding glue from said roller means (2).

10. Apparatus according to claim 9, wherein said doctor blade means (5, 6; 15, 16) is mounted rotatably around a respective rotation axis (5d, 6d; 15d, 16d).

11. Apparatus according to any one of claims 8 to 10, comprising driving means for moving said doctor blade means (5, 6; 15, 16).

12. Apparatus according to any one of claims 8 to 11, wherein said doctor blade means comprises two doctor blades (5, 6; 15, 16).

13. Apparatus according to claim 12, wherein said doctor blades (5, 6; 15, 16) are made of a single body.

14. Apparatus according to claims 12, comprising means for interconnecting said doctor blades (5, 6; 15, 16).

15. Apparatus according to any one of claims 12 to 14, wherein said doctor blades (5, 6; 15, 16) are mounted in such a way that when a doctor blade (5, 6; 15, 16) is in the respective first working position (A) the remaining doctor blade (6, 5; 16, 15) is in the respective second working position (B) and vice versa.

16. Apparatus according to any one of claims 12 to 15, wherein each doctor blade (5, 6) comprises an elongated element, in particular a shaped pivot.

17. Apparatus according to any one of claims 12 to 15, wherein said doctor blades (15, 16) comprise respective portions, facing and opposite, of a tubular element (19) of said adjusting means (4).

18. Apparatus according to claim 17, wherein said tubular element (19) is substantially cylindrical.

19. Apparatus according to claim 17 or 18, wherein said tubular element (19) comprises an internal cavity (17) suitable for receiving said shutting means (10).

20. Apparatus according to any one of claims 12 to 19, wherein each doctor blade (5, 6; 15, 16) comprises an abutting portion (5b, 6b; 15b, 16b) configured so as to abut on said roller means (2).

21. Apparatus according to any one of claims 12 to 20, wherein each doctor blade (5, 6; 15, 16) comprises a sealing portion (5c, 6c; 15c, 16c) configured so as to abut on a respective seat (3b, 3c; 3d) of said tank means (3).

22. Apparatus according to any one of claims 12 to 21, wherein each doctor blade (5, 6) comprises a respective cavity (5a, 6a).

23. Apparatus according to claim 22, wherein said cavity (5a, 6a) has a substantially U-shaped section.

24. Apparatus according to claim 22 or 23, wherein said cavity (5a, 6a) extends longitudinally for almost a whole length of the respective doctor blade (5, 6).

25. Apparatus according to any one of claims 22 to 24, wherein said doctor blades (5, 6) are mounted in such a way that said respective cavities (5a, 6a) almost face one another and are substantially turned towards said roller means (2).

26. Apparatus according to any one of claims 12 to 25, wherein said doctor blades (5, 6; 15, 16) substantially face one another and are substantially parallel.

27. Apparatus according to any one of claims 8 to 26, wherein said doctor blade means (5, 6; 15, 16) are almost parallel to said roller means (2).

28. Apparatus according to any one of claims 1 to 27, wherein said shutting means (10) comprises recess means (13, 14).

29. Apparatus according to claims 4 and 28, wherein said recess means (13, 14) is made on internal walls of said passage (12).

30. Apparatus according to claim 29, wherein said recess means (13, 14) extends for a length almost corresponding to a height of said passage (12).

31. Apparatus according to any one of claims 28 to 30, wherein said recess means (13, 14) has an almost U-shaped section.

32. Apparatus according to any one of claims 28 to 31, wherein said recess means (13, 14) comprises two recesses arranged substantially facing one another and substantially turned towards said roller means (2).

Ansprüche

1. Klebstoffverteilungsvorrichtung mit einem Walzmittel (2) zum Aufbringen eines Klebstoffs auf ein zu klebendes Element (50), mit einem Behältermittel (3) zur Aufnahme des Klebstoffs mit einer Öffnung (3a) zur Beförderung des Klebstoffs zu dem Walzmittel (2), gekennzeichnet durch ein Stellmittel (4), das zwischen dem Walzmittel (2) und der Öffnung (3a) angeordnet und zur Regulierung einer Klebstoffmenge vorgesehen ist, die zur nachfolgenden Anwendung auf einem zu klebenden Element (50) auf das Walzmittel (2) übertragen ist, und ein Verschlussmittel (10), das zwischen dem Stellmittel (4) und der Öffnung (3a) angeordnet ist und zwischen einer geschlossenen Position (C), in der das Verschlussmittel (10) die Öffnung (3a) zur Vermeidung eines Durchtritts des Klebstoffs aus dem Behältermittel (3) auf das Walzmittel (2) verschließt, und einer geöffneten Position (D), in der das Verschlussmittel (10) die Öffnung (3a) öffnet, um einen Durchtritt des Klebstoffs freizugeben, bewegbar ist.

2. Vorrichtung nach Anspruch 1, bei der das Verschlussmittel (10) um einen Drehstift (11) schwenkbar gelagert ist.

3. Vorrichtung nach Anspruch 1 oder 2, bei der das Verschlussmittel (10) ein langgestrecktes Element, insbesondere eine im Wesentlichen zylindrische Schwenkachse aufweist.

4. Vorrichtung nach irgendeinem der Ansprüche 1 bis 3, bei der das Verschlussmittel (10) einen Durchlass (12) aufweist, der einen Durchtritt des Klebstoffs zwischen dem Behältermittel (3) und dem Walzmittel (2) freigibt.

5. Vorrichtung nach irgendeinem der Ansprüche 1 bis 4, bei der das Behältermittel (3) ein Gehäuse (3d) zur Aufnahme des Verschlussmittels (10) aufweist.

6. Vorrichtung nach irgendeinem der Ansprüche 1 bis 5, bei der das Stellmittel (4) eine Klebstoffmenge einstellt, die zu und von dem Walzmittel (2) übertragen wird.

7. Vorrichtung nach Anspruch 6, bei der das Stellmittel (4) zwischen dem Walzmittel (2) und dem Verschlussmittel (10) angeordnet ist.

8. Vorrichtung nach Anspruch 6 oder 7, bei der das Stellmittel (4) ein Abstreifmittel (5, 6; 15, 16) aufweist.

9. Vorrichtung nach Anspruch 8, bei der das Abstreifmittel (5, 6; 15, 16) derart bewegbar aufgenommen ist, dass es zwischen einer jeweils ersten Arbeitsposition (A) zur Regulierung eines Durchtritts von auf das Walzmittel (2) aufzutragendem Klebstoff und einer entsprechenden zweiten Arbeitsposition (B) zur Zurückgewinnung überschüssigen Klebstoffs von dem Walzmittel (2) bewegbar ist.

10. Vorrichtung nach Anspruch 9, bei der das Abstreifmittel (5, 6; 15, 16) schwenkbar um eine jeweilige Drehachse (5d, 6d; 15d, 16d) aufgenommen ist.

11. Vorrichtung nach irgendeinem der Ansprüche 8 bis 10, die ein Antriebsmittel zur Bewegung des Abstreifmittels (5, 6; 15, 16) aufweist.

12. Vorrichtung nach irgendeinem der Ansprüche 8 bis 11, bei der das Abstreifmittel zwei Abstreifer (5, 6; 15, 16) aufweist.

13. Vorrichtung nach Anspruch 12, bei der die Abstreifer (5, 6; 15, 16) einstückig aufgebaut sind.

14. Vorrichtung nach Anspruch 12, die ein Mittel zur Zusammenschaltung der Abstreifer (5, 6; 15, 16) aufweist.

15. Vorrichtung nach irgendeinem der Ansprüche 12 bis 14, bei der die Abstreifer (5, 6; 15, 16) derart aufgenommen sind, dass ein Abstreifer (5, 6; 15, 16) sich in der jeweils ersten Arbeitsposition (A) befindet, wenn der verbleibende Abstreifer (6, 5; 16, 15) sich in der jeweils zweiten Arbeitsposition (B) befindet und umgekehrt.

16. Vorrichtung nach irgendeinem der Ansprüche 12 bis 15, bei der jeder Abstreifer (5, 6) ein langgestrecktes Element, insbesondere einen geformten Schwenkzapfen aufweist.

17. Vorrichtung nach irgendeinem der Ansprüche 12 bis 15, bei der die Abstreifer (15, 16) jeweils gegenüberliegende und entgegengesetzte Bereiche eines rohrförmigen Elements (19) des Stellmittels (4) aufweisen.

18. Vorrichtung nach Anspruch 17, bei der das rohrförmige Element (19) im Wesentlichen zylindrisch ist.

19. Vorrichtung nach Anspruch 17 oder 18, bei der das rohrförmige Element (19) einen inneren Hohlraum (17) zur Aufnahme des Verschlussmittels (10) aufweist.

20. Vorrichtung nach irgendeinem der Ansprüche 12 bis 19, bei der jeder Abstreifer (5, 6; 15, 16) einen Stirnbereich (5b, 6b; 15b, 16b) zum Angrenzen an das Walzmittel (2) aufweist.

21. Vorrichtung nach irgendeinem der Ansprüche 12 bis 20, bei der jeder Abstreifer (5, 6; 15, 16) einen Dichtbereich (5c, 6c; 15c, 16c) zur Anlage an einem jeweiligen Sitz (3b, 3c; 3d) des Behältermittels (3) aufweist.

22. Vorrichtung nach irgendeinem der Ansprüche 12 bis 21, bei der jeder Abstreifer (5, 6) einen jeweiligen Hohlraum (5a, 6a) aufweist.

23. Vorrichtung nach Anspruch 22, bei der der Hohlraum (5a, 6a) einen im Wesentlichen U-förmigen Querschnitt aufweist.

24. Vorrichtung nach Anspruch 22 oder 23, bei der Hohlraum (5a, 6a) sich der Länge nach annähernd in der Gesamtlänge des entsprechenden Abstreifers (5, 6) erstreckt.

25. Vorrichtung nach irgendeinem der Ansprüche 22 bis 24, bei der die Abstreifer (5, 6) derart aufgenommen sind, dass die jeweiligen Hohlräume (5a, 6a) sich annähernd einander gegenüberstehen und im Wesentlichen in Richtung des Walzmittels (2) gewandt sind.

26. Vorrichtung nach irgendeinem der Ansprüche 12 bis 25, bei der die Abstreifer (5, 6; 15, 16) sich im Wesentlichen einander gegenüberstehen und im Wesentlichen parallel sind.

27. Vorrichtung nach irgendeinem der Ansprüche 8 bis 26, bei der die Abstreifer (5, 6; 15, 16) annähernd parallel zu dem Walzmittel (2) sind.

28. Vorrichtung nach irgendeinem der Ansprüche 1 bis 27, bei der das Verschlussmittel (10) ein Ausnehmungsmittel (13, 14) aufweist.

29. Vorrichtung nach den Ansprüchen 4 und 28, bei der das Ausnehmungsmittel (13, 14) an Innenwänden des Durchlasses (12) ausgebildet ist.

30. Vorrichtung nach Anspruch 29, bei der sich das Ausnehmungsmittel (13, 14) in einer Länge erstreckt, die annähernd einer Höhe des Durchlasses (12) entspricht.

31. Vorrichtung nach irgendeinem der Ansprüche 28 bis 30, bei der das Ausnehmungsmittel (13, 14) einen annähernd U-förmigen Querschnitt aufweist.

32. Vorrichtung nach irgendeinem der Ansprüche 28 bis 31, bei der das Ausnehmungsmittel (13, 14) zwei Ausnehmungen aufweist, die sich im Wesentlichen einander gegenüberstehen und im Wesentlichen in Richtung des Walzmittels (2) gewandt sind.

Revendications

1. Dispositif distributeur de colle, comprenant des moyens de rouleau (2) pour appliquer une colle sur un élément à coller (50), des moyens de réservoir (3) contenant ladite colle et pourvus d'une ouverture (3a) pour amener ladite colle jusqu'auxdits moyens de rouleau (2), caractérisé en ce qu'il comprend des moyens de réglage (4) interposés entre lesdits moyens de rouleau (2) et ladite ouverture (3a) pour ajuster une quantité de colle transférée auxdits moyens de rouleau (2) pour une application ultérieure sur un élément (50) à coller, et qu'il comprend en outre des moyens de fermeture (10), interposés entre lesdits moyens de réglage (4) et ladite ouverture (3a) et mobiles entre une position fermée (C), dans laquelle lesdits moyens de fermeture (10) ferment ladite ouverture (3a) pour empêcher le passage de ladite colle desdits moyens de réservoir (3) auxdits moyens de rouleau (2), et une position ouverte (D), dans laquelle lesdits moyens de fermeture (10) ouvrent ladite ouverture (3a) pour permettre le passage de ladite colle.

2. Dispositif selon la revendication 1, dans lequel lesdits moyens de fermeture (10) sont montés rotatifs autour d'une tige rotative (11).

3. Dispositif selon la revendication 1 ou 2, dans lequel lesdits moyens de fermeture (10) comprennent un élément allongé, en particulier un pivot sensiblement cylindrique.

4. Dispositif selon l'une quelconque des revendications 1 à 3, dans lequel lesdits moyens de fermeture (10) comprennent un passage (12) permettant d'établir le passage de ladite colle entre lesdits moyens de réservoir (3) et lesdits moyens de rouleau (2).

5. Dispositif selon l'une quelconque des revendications 1 à 4, dans lequel lesdits moyens de réservoir (3) comprennent un logement (3d) destiné à recevoir lesdits moyens de fermeture (10).

6. Dispositif selon l'une quelconque des revendications 1 à 5, dans lequel lesdits moyens de réglage (4) ajustent une quantité de colle transférée auxdits moyens de rouleau (2) et depuis ceux-ci.

7. Dispositif selon la revendication 6, dans lequel lesdits moyens de réglage (4) sont interposés entre lesdits moyens de rouleau (2) et lesdits moyens de fermeture (10).

8. Dispositif selon la revendication 6 ou 7, dans lequel lesdits moyens de réglage (4) comprennent des moyens de raclette docteur (5, 6 ; 15, 16).

9. Dispositif selon la revendication 8, dans lequel lesdits moyens de raclette docteur (5, 6 ; 15, 16) sont montés mobiles de manière à être déplaçables entre une première position de travail respective (A), destinée à réguler le passage de la colle à étaler sur lesdits moyens de rouleau (2), et une deuxième position de travail respective (B), destinée à récupérer la colle en excès sur lesdits moyens de rouleau (2).

10. Dispositif selon la revendication 9, dans lequel lesdits moyens de raclette docteur (5, 6 ; 15, 16) sont montés rotatifs autour d'un axe de rotation correspondant (5d, 6d ; 15d, 16d).

11. Dispositif selon l'une quelconque des revendications 8 à 10, comprenant des moyens d'entraînement pour déplacer lesdits moyens de raclette docteur (5, 6 ; 15, 16).

12. Dispositif selon l'une quelconque des revendications 8 à 11, dans lequel lesdits moyens de raclette docteur comprennent deux raclettes docteur (5, 6 ; 15, 16).

13. Dispositif selon la revendication 12, dans lequel lesdites raclettes docteur (5, 6 ; 15, 16) sont faites d'un seul corps.

14. Dispositif selon la revendication 12, comprenant des moyens pour interconnecter lesdites raclettes docteur (5, 6 ; 15, 16).

15. Dispositif selon l'une quelconque des revendications 12 à 14, dans lequel lesdites raclettes docteur (5, 6 ; 15, 16) sont montées de telle manière que, lorsqu'une raclette docteur (5, 6 ; 15, 16) est dans la première position de travail respective (A), l'autre raclette docteur (6, 5 ; 16, 15) est dans la deuxième position de travail respective (B), et vice versa.

16. Dispositif selon l'une quelconque des revendications 12 à 15, dans lequel chaque raclette docteur (5, 6) comprend un élément allongé, en particulier un pivot profilé.

17. Dispositif selon l'une quelconque des revendications 12 à 15, dans lequel lesdites raclettes docteur (15, 16) comprennent des portions respectives, en vis-à-vis et opposées, d'un élément tubulaire (19) desdits moyens de réglage (4).

18. Dispositif selon la revendication 17, dans lequel ledit élément tubulaire (19) est sensiblement cylindrique.

19. Dispositif selon la revendication 17 ou 18, dans lequel ledit élément tubulaire (19) comprend une cavité interne (17) apte à recevoir lesdits moyens de fermeture (10).

20. Dispositif selon l'une quelconque des revendications 12 à 19, dans lequel chaque raclette docteur (5, 6 ; 15, 16) comprend une portion en about (5b, 6b ; 15b, 16b) configurée de façon à s'abouter sur lesdits moyens de rouleau (2).

21. Dispositif selon l'une quelconque des revendications 12 à 20, dans lequel chaque raclette docteur (5, 6 ; 15, 16) comprend une portion d'étanchement (5c, 6c ; 15c, 16c) configurée de manière à s'abouter sur un siège respectif (3b, 3c ; 3d) desdits moyens de réservoir (3).

22. Dispositif selon l'une quelconque des revendications 12 à 21, dans lequel chaque raclette docteur (5, 6) comprend une cavité respective (5a, 6a).

23. Dispositif selon la revendication 22, dans lequel ladite cavité (5a, 6a) possède une section sensiblement en U.

24. Dispositif selon la revendication 22 ou 23, dans lequel ladite cavité (5a, 6a) s'étend longitudinalement sur presque toute la longueur de la raclette docteur respective (5, 6).

25. Dispositif selon l'une quelconque des revendications 22 à 24, dans lequel lesdites raclettes docteur (5, 6) sont montées de telle manière que lesdites cavités respectives (5a, 6a) sont presque en face l'une de l'autre et sont sensiblement orientées vers lesdits moyens de rouleau (2).

26. Dispositif selon l'une quelconque des revendications 12 à 25, dans lequel lesdites raclettes docteur (5, 6 ; 15, 16) sont sensiblement en vis à vis entre elles et sont sensiblement parallèles.

27. Dispositif selon l'une quelconque des revendications 8 à 26, dans lequel lesdites raclettes docteur (5, 6 ; 15, 16) sont presque parallèles auxdits moyens de rouleau (2).

28. Dispositif selon l'une quelconque des revendications 1 à 27, dans lequel lesdits moyens de fermeture (10) comprennent des moyens de creux (13, 14).

29. Dispositif selon les revendications 4 et 28, dans lequel lesdits moyens de creux (13, 14) sont réalisés sur des parois intérieures dudit passage (12).

30. Dispositif selon la revendication 29, dans lequel lesdits moyens de creux (13, 14) s'étendent sur une longueur correspondant presque à une hauteur dudit passage (12).

31. Dispositif selon l'une quelconque des revendications 28 à 30, dans lequel lesdits moyens de creux (13, 14) ont une section presque en U.

32. Dispositif selon l'une quelconque des revendications 28 à 31, dans lequel lesdits moyens de creux (13, 14) comprennent deux creux placés sensiblement en vis-à-vis et sensiblement orientés vers lesdits moyens de rouleau (2).

Drawing