EP2428340B1 - Dosing arm kinematics - Google Patents

Description

Technical area

The present invention relates to an adhesive supply device according to the preamble of claim 1, and to a method for adjusting such an adhesive supply device according to the preamble of claim 14.

Such a device and such a method are out DE 10234618A1 known.

State of the art

In the furniture industry, surfaces of furniture fronts, carcass parts, etc. are commonly provided with coating material, in particular also the narrow sides of such workpieces. The narrow sides are often referred to as edges. The coating material, the actual edge, is applied to the workpieces using an adhesive (glue, glue). For the application of such a coating material in the region of the workpiece narrow side so-called edgebanders are known.

The adhesive is hereby heated and liquefied for processing, and provided for transfer by means of a glue roller. The glue can be moved up against the gravitational direction along the glue roller and transferred to a coating material.

Systems are also known in the prior art in which the glue is heated above the glue roller and fed in the direction of gravity. However, these systems have, inter alia, the disadvantage that a rather complex mechanism with multiple drive elements must be provided to prevent unwanted leakage of the heated glue then prevent when no coating material is supplied. This mechanism is realized in the prior art with two single controlled Dosierschiebern.

Presentation of the invention

It is an object of the present invention to provide gravitational alignment delivery of the adhesive which functions reliably with reduced structural complexity.

The object is achieved by a device according to claim 1 and a corresponding method. Advantageous embodiments of the present invention are described in the dependent claims.

The core idea of the present invention is to provide a novel adjustment mechanism for an adhesive supply device. Here, the adhesive (the glue) to be fed in the direction of gravity of a glue roller. However, the adhesive supply via the upper part of the adhesive supply device should only be achieved via a working cylinder (in particular a pressure cylinder) and via a servomotor, wherein leakage of the glue is to be prevented in a "non-working position".

For this purpose, an adjusting mechanism according to claim 1 is provided. On the basis of the adjusting mechanism described in claim 1, the upper part can assume different working positions. To set these working positions, it is only necessary to set a stop by means of a first drive, and to perform an adjusting movement by means of a second drive. Several drives for individual metering edges are therefore not necessary.

This results in a reduced complexity of the adjustment mechanism over the prior art.

In detail, the adjusting mechanism according to the invention has only one working cylinder for an adjusting movement, as well as a further drive, in particular a servo motor, for adjustability. The adjustment mechanism ensures that the upper part is aligned with respect to the glue roller, that two working positions can be realized. Thus, the mechanism according to the invention with less interference-prone drives than the prior art.

Also, such adjusting mechanism is remotely controllable, which is why a manual handling on the machine can be omitted. However, the manual adjustability is by no means excluded by the present invention, and may optionally be performed alternatively or additionally.

Further preferred embodiments of the present invention are described in the dependent claims. Thus, the adjustment mechanism of the adhesive supply means has the advantage that the gap between one of the edges of the upper part and the adhesive transfer tool can be adjusted continuously.

Next, a provision is usually provided in the form of a spring on the second drive mechanism, to return the upper part delivered by the second drive mechanism back to a starting position. Since the adhesive supply is placed only in one of the operating positions with the second drive mechanism, this can be ensured that the malfunction of the glue is prevented in the case of a malfunction (so-called "emergency stop function"). As soon as the second drive mechanism is no longer driven, the provision returns the adjustment mechanism in the so-called Pause back. If the second drive mechanism be designed as a pressure cylinder, this case occurs as soon as the pneumatic pressure in the cylinder decreases.

Brief description of the drawings

Fig.1

shows a perspective view of an adhesive supply device according to embodiment 1 of the present invention.

1a

shows a detailed view of the adjustment of the in Fig.1 shown adhesive supply.

2a-2d

show four operating positions of in Fig.1 shown adhesive supply.

Figure 3

shows a perspective view of an adhesive supply device according to Embodiment 2 of the present invention.

3a

shows a detailed view of the adjustment of the in Figure 3 shown adhesive supply.

4a-4d

show four operating positions of in Figure 3 shown adhesive supply.

Figure 5

shows a perspective view of an adhesive supply device according to Embodiment 3 of the present invention.

5a

shows a detailed view of the adjustment of the in Figure 5 shown adhesive supply.

6a-6d

show four operating positions of in Figure 5 shown adhesive supply.

7a-7d

are schematic representations of the four operating positions in plan view.

Description of exemplary embodiments

Exemplary embodiments of the present invention will be described below with reference to the figures, as well as the method according to the invention.

Embodiment 1

The adhesive supply device according to Fig. 1 comprises a base 1, on whose upper surface a drainage means 1a is provided for an adhesive. In the area of the drain 1a, a glue roller 100 is provided which extends substantially perpendicular to the base 1. The glue roller 100 has some or even a knurled surface to well absorb the adhesive (glue) and on a workpiece (not shown) can be transferred, and is rotatably mounted in the base 1. The annular gap between the glue roller 100 and the base 1 is so small or sealed that no liquefied glue can get between the glue roller 100 and the base 1 during operation.

In another area of the upper surface of the base 1, a support member 2 is attached. On or next to the support element in turn a feeler (not shown) is provided. The object of the feeler shoe is to guide a workpiece (eg an edge material) into the region of the glue roller 100 in such a way that the workpiece can be provided with glue on one of its surfaces.

The support member 2 serves, as described in more detail later, to attach a top 20 with glue supply to the base 1.

Further, an adjustment mechanism is provided in the base 1 in an area near the support member 2 and close to the drain 1a. According to Embodiment 1, the adjusting mechanism has a rear inner eccentric shaft 7 and a rear outer eccentric shaft 8. The rear inner eccentric shaft 7 is mounted in the rear outer eccentric shaft 8. In turn, a cylindrical bore is provided in the rear inner eccentric shaft 7.

Further, the adjusting mechanism in a position between the rear eccentric shafts 7, 8 and the glue roller 100 on a front eccentric shaft 9, which in turn is provided with a cylindrical bore 9 a. Thus, the rear eccentric shafts 7, 8 and the front eccentric shaft 9 are arranged adjacent to each other.

It should be noted that the terms "front" and "rear" refer to the arrangement of the eccentric shafts with respect to the glue roller 100. "Front" thus means "closer to the glue roller 100".

The adhesive supply device has a removable upper part 20 above the base 1. The upper part 20 comprises a body 21, and a glue container 26 in the upper region of the body 21. The glue container 26 in turn is closed by means of a lid 27, wherein in the lid 27 an opening 27a is provided to fill a pasty glue or a glue granules can. Usually, as can be seen from the figures, such a lid is flanged to the glue container 26. This can be done via screw connections, as shown, via clips, clips or the like.

In the region of the body 21 heating elements (not shown) are provided. The heating elements according to this embodiment are ceramic heating elements. By means of the heating elements, the body 21 of the upper part 20 is heated in order to convert the glue or adhesive into a liquid state and then be able to transfer it by means of the glue roller 100 onto a workpiece. In this case, it can be seen from the figures and the described construction that in this embodiment the glue is transferred from above onto the glue roller, and then flows down along the glue roller in accordance with gravity. In this way, the glue is then picked up by a workpiece when the upper part is in its working position. The excess glue, which does not reach the workpiece, is pulled back towards the glue container

The drain 1a and the gutter 30 fulfill in the cleaning of the device, the task of dissipating and picking up glue residue and are used for emptying in the emptying position described in more detail later.

Next, a clearance 22 is provided in the body 21 to secure the upper part 20 by means of the support member 2 to the base can. For this purpose, on a horizontal surface 22c (see Fig. 2 ) of the space 22 on the surface of an element 6 placed, which in turn pins (only one of the pins (6a) is in the FIGS. 1 . 1a to see), which extend through the vertical holes in the body 21 and in bores of the rear inner eccentric shaft 7 and the front eccentric shaft 9 and thus fix the element 6.

On the upper part 20, a circular bore 25 with a first edge 25a and a second edge 25b are provided in a region of the body 21 which in the mounted state faces the glue roller 100 (see here Fig. 7 such as Fig. 2a-2d ). The edges 25a, 25b may have dosing and sealing edges incorporated therein which may be combined or formed individually. The bore 25 extends in the vertical direction, and the edges 25a, 25b are used for glue application to the glue roller 100. After the production of the Bore 25, edges 25a, 25b are produced by a parallel drilling in relation to the bore 25.

As Fig. 1 can be seen, above the edges 25a and 25b, a projection 24 of the upper part 20 is provided, which has a bore 24a, with which the upper part 20 can be aligned to the roller 100 in the mounted state. When mounting the upper part 20 to the base 1, this is aligned in the region of the projection 24. For this purpose, a fastened to the projection 24 by means of screws element engages in a groove on a pressure piece 101, which pressure piece 101 is provided in the axial direction above the glue roller 100. Between thrust piece 101 and glue roller Axialgleitdichtung 102 is provided. There is therefore no connection between the projection and glue roller, since the glue roller is stored for itself.

As in FIG. 1 1, a motor M is provided in the region of the adhesive supply device, which motor drives a shaft in such a way that it in turn generates a rotational movement of the glue roller 100. The shaft (and thus also the glue roller 100) can be rotated in two different directions, namely in the so-called "synchronization" and in the so-called "mating". In the "synchronism", the sizing roll 100 is rotated so that the circumference adjacent to the workpiece moves in the direction of feed movement of the workpiece; in the "reverse", the sizing roll 100 rotates so that the circumference runs counter to the feeding movement of the workpiece.

From a synopsis of FIGS. 1 and FIG. 1b shows the mounting of the upper part 20 to the base 1. The upper part 20 is brought into an area above the base 1, and aligned with the glue roller 100.

Subsequently, the upper part 20 is guided in the direction of the base 1. In this case, two line contacts or narrow parallel gaps are formed between the respective edge 25a, 25b and the glue roller 100. Now, the upper part 20 fixed to the base 1 by means of the support device 2. To this end, the element 6, which has two pins at the two outer ends, is applied to the surface 22c of the clearance 22 such that the pins extend respectively into the vertical bores of the body 21 and the vertical bores 7a, 9a. The support device 2 establishes a punctiform contact between the upper part 20 and the base 1 on the element 6.

Next is in Fig. 1 and 1a to see a servo motor 40, which provides the adjustment of the kinematics of the adhesive supply. Next is a pressure cylinder 42 actuator shown, which is arranged substantially parallel to the servo motor 40. The servo motor 40 has a pin 41 which can be moved in translation in the axial direction by means of the servomotor 40. Motor 40 and pin 41 provide the adjusting movement.

In a space surrounded by the base 1, the kinematics for adjusting the upper part 20 is provided. In Fig. 1a For this purpose, an upper disc 50, a lower disc 52, and a plurality of pins 51 are provided, wherein the pins 51 connect the upper and lower discs 50, 52. As a result, a so-called stop cage is defined. On one of the pins 51, the pin 41 of the servomotor 40 engages, so that the discs 50, 52 can be rotated by a translational movement of the pin 41 (see also Fig. 2a-2d ).

The upper disc 50 in turn is connected to the rear outer eccentric shaft 8, so that the movements of the servomotor 40 via the pin 41 contributes to the rotation of the rear outer eccentric shaft 8. The rear center of rotation of the kinematics (hole 7a) is not adjusted by the adjustment of the outer eccentric shaft 8. As a result, the first adjustment for the upper part 20 is given, because by adjusting the discs 50, 52, the stop for the adjusting movement is changed. In other words, a twisting leads the discs 50, 52 not directly to the adjustment of the upper part 20, but serves to preset the later adjusting movement.

Between the upper and lower discs 50, 52 protrudes the rear inner eccentric shaft 7. This is controlled by the pressure cylinder 42. At the pressure cylinder pressure cylinder 42, a return spring is provided, so that the raising movement of the pressure cylinder 42 can be reset as soon as the pressure cylinder is transferred to a non-pressurized state. With this mechanism, the upper part 20 is set based on the presetting described above.

The front eccentric shaft 9 has no own drive, but is carried along by the movement of the upper part 20 and directs the movement of the upper part 20th

The adhesive supply can thus four in Fig. 2a-2d as in Fig. 7a-7d occupy shown operating positions:

1) "Pause" (Figures 2a and 7a)

In the pause position, the bore 25 of the upper part 20 is located in the region of the glue roller 100 in such a way that the edges 25a, 25b lie substantially against the glue roller 100 on both sides, or extend parallel to the glue roller 100. In this position, no glue from the container 26 can be applied to the glue roller 100. In other words, the glue supply is cut off and leakage of the glue is prevented. The "pause position" represents the basic position in the context of the present invention, since in this position, the pressure cylinder 42 is returned by the return spring and not actuated.

2) "synchronism position" (FIGS. 2b and 7b)

In the same arrangement, the glue roller is rotated in the same direction as the workpiece is fed. The feed direction of the workpiece is in Fig. 7b shown with an arrow. The gap between the trailing edge 25b and the glue applicator roll 100 is adjusted so that the desired amount of glue can exit and be transferred from the roller to the workpiece. The "synchronized position" thus represents a first working position.

The upper part 20 is aligned such that the workpiece facing edge has a smaller gap width to the glue roller. The edge facing away from the workpiece has a larger gap width to the glue roller, so that in the workpiece gap of the adhesive can be freely drawn into the upper part 20 of the adhesive supply.

3) "mating position" (FIGS. 2c and 7c)

In the opposite position, the glue roller 100 rotates against the feed direction of the workpiece. The edge 25a on the side facing away from the workpiece is adjusted to a small gap width, which corresponds to the amount of glue to be applied. The edge 25b on the workpiece-facing side has a larger gap. There, excess glue is drawn into the hole.

4) "emptying" (Figures 2d and 7d)

The emptying represents a combination of synchronized and mating position, in which the glue roller works in "synchronism", the position of the upper part 20 is set to "mating". Thus, the leaking adhesive can be passed into the gutter 30 and disposed of after cooling.

Due to the positioning motor 40 used in the embodiment described above, the kinematics for adjustment of the upper part 20 are remotely controlled. The gap width of the metering edge 25a or 25b can be varied steplessly by actuation of the servomotor 40 without removing a cover hood of the adhesive supply device. By changing the rotations of the servomotor 40, the actuating cylinder can set a different end position and thereby a changed position of the upper part 20 via a changed position of the stop.

Apart from this remote controllability of the kinematics and manual adjustment of the upper part 20 may be provided. The adjustment also takes place via the stop, and is possible via a handwheel and a spindle (not shown). The manual adjustment is done i.d.R. after opening a cover (not shown).

In addition to the manual setting described here, the setting can also be ensured differently. It is also possible to operate the adjusting movement manually.

Embodiment 2

Hereinafter, another embodiment of the present invention will be described with reference to FIGS Figures 3 . 3a and 4a-4d described.

Embodiment 2 of the present invention includes a base 200 similar to the previous embodiment 1, above which a top 20A is disposed. Other substantially identical components are in the Figures 3 . 3a and 4a-4d provided with the same reference numerals as in embodiment 1.

In the area of the front eccentric shaft 9 of Embodiment 1, in the apparatus 200 according to Embodiment 2, there is a bolt 201 which has on the side facing the upper part 20A a rolling bearing 202 eccentrically arranged to the axis of the bolt 201 (see FIG Fig. 3a ). The Rolling bearing 202 is received in a recess 208 of a horizontally extending guide 206. The recess 208 has in plan view ( FIGS. 4a-4d ) has the shape of a substantially isosceles triangle, of which one of the rounded tips points in the direction of the glue roller 100.

Instead of the rear eccentric shafts 7, 8 of Embodiment 1, the recliner mechanism of Embodiment 2 comprises a bolt 203 extending vertically out of the base 200, which is fixedly connected to a horizontally extending lever 204. At a remote from the bolt 203 portion of the lever 204, a rolling bearing 205 is provided. The rolling bearing 205 engages in a round bore 207 of the guide 206.

Thus, the guide 206 is pivotally connected to the base 200 via the rolling bearings 202 and 205. The guide 206 is again over vertically extending pins 6a, 6b (see FIG Fig. 3a ) is connected to the top 20A. For this purpose, the pins 6a, 6b are attached to the guide, extend through a portion of the upper part 20A and are connected in the region of the free space 22 with a common element 6. The support element 2 engages the element 6, and thus ensures a connection between the upper part 20 A and base 200.

The lever 204 is deflected in the present embodiment to move the upper part 20A toward or away from the glue roller 100. For this purpose, the printing cylinder 42 is pneumatically actuated. This leads to a deflection of the lever 210. The lever 210 in turn is connected to the bolt 203 in connection. Thus, upon actuation of the pneumatic pressure cylinder 42, the bolt 203 is rotated. If, on the other hand, the pressure cylinder 42 is relieved again, a spring 211 acting on the lever 210 allows the return of the lever 210, and thus a return rotational movement of the bolt 203.

About this mechanism, the upper part 20A is led to the glue roller 100 or again led away from this, that the device can take the operating positions break / work (ie synchronism or mating) or emptying.

The rotational movement of the bolt 201 in turn serves to position the metering edges. Here, the movement of the bolt 201 is realized via a gear rack drive with actuator. For this purpose, a gear is coaxially mounted on the bolt 201, and a rack engages tangentially on this gear. In the rack, in turn, there is a threaded nut, which engages a threaded spindle of a servomotor. By the rotation of the threaded spindle, the rack is moved in translation, which in turn leads to a rotational movement of the bolt 201. If the pin 201 is rotated to position the system, the contact between the roller bearing 202 and the recess 208 of the guide 206 causes a pivoting movement of the upper part 20A about the rolling bearing 205 on the lever 204.

In the FIGS. 4a-4d are shown below the working positions already described for the first embodiment. In Fig. 4a Fig. 3 shows the pause position in which the pressure cylinder 42 is in a depressurized state, and thus the edges 25a, 25b (as shown schematically in Figs Fig. 7a shown) substantially abut the glue roller 100. In contrast, the printing cylinder 42 is printed in the operating positions 4b-4d. Accordingly, via the servomotor 40, the synchronous position ( 4b ), the mating position ( 4c ) and the emptying position (4d) realized.

Embodiment 3

The device according to Embodiment 3 is formed similar to that according to Embodiment 2. That's one Base 300 is provided above which a pivotable upper part 20B is mounted.
However, a drop-like pressure piece 302 is provided on the pin 301, which substantially corresponds to the pin 201 of Embodiment 2, instead of the rolling bearing. The pressure piece 302 is arranged eccentrically to the axis of the bolt 301.

Also similar to Embodiment 2, in the present embodiment 3 is another bolt 303 having a lever 304 that substantially corresponds to the bolt 203 with the lever 204. However, in turn instead of the rolling bearing as a connecting element to the guide 306 drop-shaped pressure piece 305 is provided, which has two peaks in contrast to the drop-shaped pressure piece 302.

The drop-shaped pressure piece 305 engages in a recess 307 of the guide 306. The recess 307 also has a double-pointed teardrop shape, but leaves the drop-shaped pressure piece 305 a certain play.

The drop-shaped plungers 302 and 305 have the additional advantage over the rolling bearings that a lower heat transport from the upper part 20A for storage of this takes place in the base 300.

The adjusting mechanism is similar to that of embodiment 2. Thus, 40 operating positions can be realized by an operation of the pressure cylinder 42 and the servomotor 40, namely the pause position ( Fig. 6a ), the synchronous position ( Fig. 6b ), the mating position ( Fig. 6c ) and the emptying ( Fig. 6d ).

Claims (15)

1. Adhesive delivery device for applying an adhesive to a workpiece, which has:

   a base (1) and a movable portion (20, 20A, 20B) having edges for metering out the adhesive,

   an adhesive transfer tool (100), wherein

   the adhesive delivery device has an adjusting mechanism for adjusting the position of the portion (20, 20A, 20B) relative to the adhesive transfer tool (100),

   characterised in that the movable portion (20, 20A, 20B) is arranged above the base (1) and in that the adhesive transfer tool (100) is mounted on the base (1), wherein during operation of the adhesive delivery device the adhesive is delivered by the portion (20, 20A, 20B) to the adhesive transfer tool (100),

   wherein a first drive mechanism (40) can adjust a stop in order to define, by the stop, several working positions of the portion (20, 20A, 20B) in relation to the adhesive transfer tool (100),

   and a second drive mechanism (42), in particular a pressure cylinder, is designed to move the portion (20, 20A, 20B) in relation to an adhesive transfer tool (100) out of a main position into the position defmed by the stop.
2. Adhesive delivery device according to claim 1, in which the stop defines a small gap between the portion (20, 20A, 20B) and the adhesive transfer tool (100) on one or the other vertically extending side of the adhesive transfer tool (100), and at the same time serves to adjust the gap size.
3. Adhesive delivery device according to claim 1 or 2, in which the adjusting mechanism can cause a pivot movement of the portion (20, 20A, 20B).
4. Adhesive delivery device according to any of the preceding claims, characterised in that the portion (20, 20A, 20B) is guided in a horizontal plane during the adjusting movement by means of a guide (206, 306).
5. Adhesive delivery device according to claim 1, in which a return spring (111, 211, 311) is provided for returning the portion (20, 20A, 20B), which has been displaced by the second drive mechanism (42), back to a starting position.
6. Adhesive delivery device according to any of the preceding claims, characterised in that the second drive mechanism (42) drives a lever (210, 310) which is movable in a horizontal plane and which is rotatably fixed to the base (1) and connected to the portion (20, 20A, 20B).
7. Adhesive delivery device according to any of the preceding claims, in which the stop can be displaced infinitely variably with the first drive mechanism (40).
8. Adhesive delivery device according to any of the preceding claims, in which the portion (20, 20A, 20B) is detachable from the base (1).
9. Adhesive delivery device according to any of the preceding claims, characterised in that the first drive mechanism (40) allows a pin (201, 301) to rotate relative to the base (1), which pin (201, 301) is connected to the portion (20, 20A, 20B) via an eccentrically arranged mounting (202, 302), in particular a rolling bearing or a drop-shaped thrust member.
10. Adhesive delivery device according to any of the preceding claims, characterised in that the first drive mechanism (40) is connected during normal operation to the portion (20, 20A, 20B) via a rolling bearing (205) or a thrust member (304), and the second drive mechanism (42) is connected during normal operation to the portion (20, 20A, 20B) via a rolling bearing (202) or a thrust member (302).
11. Adhesive delivery device according to any of the preceding claims, in which the portion (20, 20A, 20B) is further aligned and guided at one end of the adhesive transfer tool (100).
12. Adhesive delivery device according to any of the preceding claims, in which a movable receptacle (26) is mounted on the portion (20, 20A, 20B) for holding glue or glue precursors, and delivering the glue to the adhesive transfer tool (100) from above during operation.
13. Machine for gluing on a coating material, in particular edge material, which has the adhesive delivery device according to any of the preceding claims.
14. Method for operating a portion (20, 20A, 20B) of an adhesive delivery device, wherein the portion (20, 20A, 20B) delivers an adhesive to an adhesive transfer tool (100), characterised in that the portion (20, 20A, 20B) is an upper portion and wherein the method has the steps of:

    operating a first drive mechanism (40) for adjusting a stop,

    operating a second drive mechanism (42) as far as a position defined by the stop, as a result of which the upper portion (20, 20A, 20B) is guided out of the main position into a working position,

    moving an adhesive transfer tool (100) in one direction, wherein an adhesive is delivered in order to provide a workpiece with the adhesive.
15. Adhesive delivery device according to any of claims 1 to 12, characterised in that the adhesive transfer tool is a glue roller.

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