EP1808237B1 - Web-coating device - Google Patents

Description

The invention relates to a coil coating device for (continuously) coating strips, in particular metal strips,

with at least one applicator head for applying (liquid) coating materials to a belt passing through the coating device, the applicator head having at least one application roller which applies the coating material to the belt and

with at least one support roller arranged on the side of the belt opposite the application head.

Tapes in the context of the invention, in particular metal strips, for example steel strips or aluminum strips. Coating of such strips means in particular the application of non-metallic, organic layers or coatings. In this respect, it is in particular the application of liquid coating materials, for example paints or plastics. In addition to the applicator roller, the applicator head regularly has at least one pickup roller, which picks up the coating material and delivers it directly or indirectly to the applicator roller. If the supply of the coating material by immersion of the pickup roller in a container, it is also referred to as a scoop roller. If the applicator head only consists of the pick-up roller and the applicator roller, this is referred to as a two-roller head, with the pickup roller then simultaneously forming a metering roller. In the context of the invention, the applicator head also means a so-called three-roller head, in which a metering roller or regulating roller is arranged between the pickup roller and the applicator roller. Both two-roll heads and three-roll heads can be designed for an opposite or concurrent driving style.

Coil coating devices are known in practice, in which the application head is arranged directly on the opposite side of the support roller, so that the coating takes place, as it were, against the support roller. This has the advantage that the tape is properly supported during the coating process. In particular, when coating thin strips, however, there is the problem that the coating material is applied not only on the tape to be coated, but also directly on the support roller, since the applicator roller of the applicator head for a perfect coating process is regularly wider than the tape to be coated. Such contamination of the support roller, which is also referred to as "drum", is particularly undesirable when changing the tape position on the support roller in the course of the passage. Because then it can lead to an unwanted back coating of the tape. The same applies to the case that paint or the like runs on the support roller.

It is therefore also known, the support roller with a coat or stocking of z. B. rubber, which has a width which coincides with the width of the tape to be coated. A disadvantage of such solutions is the fact that the jacket must be replaced when changing the bandwidth, so that a stoppage of the plant must be taken into account.

Furthermore, there are known strip coating apparatuses without a support roller, in which the application head operates on a free band area, the band to be coated being under strip tension in this area. It should always be noted that due to the furnaces regularly subordinate to the coating devices geometrical constraints arise for the tape guide.

Coating devices for coating strips are out GB 888,972 or DE 8 707 411 known.

The invention is based on the object to provide a strip coating device of the type described above, which allows a perfect coating and at the same time flexible for different purposes and in particular different tape thicknesses, can be used.

To achieve this object, the invention teaches in a generic coil coating apparatus for coating strips, in particular metal strips, that the application head either in a first functional position of the coil coating device (directly) in the support region of the support roller or in a second functional position of the coil coating device in a free band outside Supporting area of the support roller works on the belt. - The coating device according to the invention is thus characterized by a combined structure in which can be coated with one and the same application head in different functional positions of the device either against a support roller or against a free band under tape tension. Thus, for example, it is possible, when using thick strips (thickness ≥ 0.3 mm) to coat in a conventional manner against the support roller, as with sufficient strip thickness contamination of the support roller is not to be feared and the use of the support roller proper guidance of Bandes enabled. With one and the same application head, for example, thin bands (thickness <0.3 mm) can then be coated against the strip tension in a free band area after changing the functional position in the second functional position. In this context, it is expedient if the support roller is assigned to at least one tensioning roller on the side of the belt opposite the application head. This tension roller may be arranged upstream or downstream of the support roller in the belt running direction at a predetermined distance. The application head or its application roller then operates either in the first functional position of the belt coating device directly against the support roller or in the second functional position the belt coater in the free belt area between the backup roller and the tension roller on the belt. The tensioning roller can thus be set essentially without function in the first functional position, while in the second functional position, in interaction with the support roller and the application head, it ensures the desired belt tension and proper guidance of the belt.

In the context of the invention, it is therefore provided that in the first functional position for coating preferably thicker strips, the application roller of the applicator head and the support roller are arranged to each other so that the distance between the surface of the applicator roller and the surface of the support roller (approximately) the thickness corresponds to the tape to be coated and consequently the applicator roll is applied directly with the interposition of the belt against the support roller. Thick bands means in the invention z. B. tapes with a thickness of about 0.3 mm or more. In contrast, in the second functional position for coating, for example, thin strips provided that the distance between the surface of the applicator roll and the surface of the support roller and / or the surface of the tension roller in each case by a predetermined amount is greater than the thickness of the continuous belt. In this context, however, it is expedient if this distance, which should be greater than the strip thickness, is chosen to be relatively small, in order to achieve optimum fixation of the strip within the strip coating device. Thin bands means within the scope of the invention z. B. Tapes with a thickness smaller than about 0.3 mm. In this case, the invention proposes that the distance of the surface of the applicator roll from the surface of the support roller and / or the surface of the tension roller in the second functional position of the belt coater less than 20 mm, preferably as 10 mm z. B. is less than 5 mm. Thus, a distance of 1 mm to 5 mm may be particularly useful. Taking into account a not insignificant strip thickness is provided that said Distance is a maximum of 20 mm greater than the strip thickness, preferably at most 10 mm greater than the strip thickness, z. B. at most 5 mm larger than the strip thickness. In this respect, it may be expedient if the distance in about 1 mm to 5 mm greater than the strip thickness.

According to a preferred embodiment of the invention, the band is guided in the second functional position in the coil coating device so that the wrap angle of the belt around the applicator roll is less than 40 °, preferably less than 30 °, z. B. 10 ° to 20 °. The wrap angle depends on the one hand by the radii of the rollers and the distance between the support roller and the tension roller and on the other hand from the "immersion depth" of the applicator roller in the area between the support roller and the tension roller.

According to a further proposal of the invention, which is of particular importance, the support roller and the tension roller are arranged in or on a common roller frame, wherein the position of the support roller and / or the position of the tension roller within the roller frame for the change from a functional position in the other functional position is adjustable.

In this case, according to an embodiment of the invention, the tension roller and the support roller are each mounted rotatably or rotatably in a bogie, wherein the bogie itself is rotatably mounted within the roller frame. By arranging the tensioning roller and the support roller in a rotatable bogie, the coating device can be transferred in a particularly simple manner quickly from the first functional position to the second functional position, namely by turning the bogie with its rollers by a corresponding angle of rotation. The complex replacement of individual rolls is therefore not required. Even a larger change in position of the applicator head is not required because the change of the functional position primarily by suitable positioning of the support roller and the tension roller, For example, by means of the bogie, takes place. Nevertheless, it may be appropriate or necessary, in addition to adapting to the functional position of the support roller and the tension roller to move the gun to a small degree in the already provided guidance. The bogie has at least two the support roller and the tension roller frontally interconnecting rotating arms. The support roller and the tensioning roller are in each case mounted at the ends on the rotating arms, wherein the bogie is rotatable about an axis of rotation of the rollers arranged between the axes of rotation. One or more rotary drives are preferably connected to the bogie, for example to one or both rotary arms. These allow an automated change of the functional positions. The rotary actuators can be designed according to a further proposal of the invention as linear actuators, for example cylinder piston assemblies, which are either connected directly to the bogie, for example to the rotating arms or via at least one transmission lever to the bogie, for example to the rotating arms connected are. If a transmission lever is used here, then this can be designed as a crank or as a turntable, wherein the linear actuators then eccentrically attack on such a crank or turntable. In any case, in particular by the use of a transmission lever, a perfect implementation of a linear drive movement in a rotary motion of the bogie for the purpose of switching from a functional position to the other functional position succeeds. However, alternative drive concepts are also conceivable. So z. B. instead of linear drives with acting on the shaft electromotive drives optionally with the interposition of transmissions. It is also possible with z. B. hydraulic rotary actuators to work.

The cylinder piston arrangements forming the linear drives can be hydraulically acting, pneumatically acting or even electrically acting cylinder piston arrangements.

In a modified embodiment of the invention, at least the tensioning roller (and possibly also the support roller) is rotatably mounted on a pivoting frame, wherein the tensioning roller with the pivoting frame for the change from a functional position to the other functional position is pivotable. Such a pivoting frame may have at least two pivoting arms, wherein the tensioning roller is mounted on these pivoting arms, for example, at the end. Thus, in this embodiment, not both the back-up roll and the back-up roll are moved with a bogie within the roll stand, but it may be sufficient to pivot only the back-up roll relative to the belt and / or the back-up roll to move the coating device from the first operative position into the back-up roll to bring the second functional position and vice versa. In the first functional position in the coating against the support roller, the tension roller is thus swung out of the band area. If, on the other hand, it is intended to coat the strip under strip tension, then the tensioning roller is pivoted against the strip, while the supporting roller can basically remain in its position. Preferably, however, the position of the support roller is movable within the roller frame. For this purpose, the support roller can be displaced, for example, guided on linear guides, and also via suitable drives, namely displacement drives. Preferably, the tensioning roller is pivoted about its own pivot axis of the pivoting frame, which is spaced from the axis of rotation of the support roller. However, there is also the possibility that the pivoting frame is as it were connected to the support roller, so that the tensioning roller is then pivoted about the support roller, namely by coinciding the pivot axis of the pivoting frame substantially with the axis of rotation of the support rollers. Besides, it can be required to move the gun in the free band area between the back-up roll and tensioning roll, so that then can be coated under tape tension against the free band between the backing roll and tensioning roll. In this embodiment, pivot drives are connected to the pivoting frame, for example to the pivot arms. These rotary actuators can also be designed as linear drives, for example cylinder piston arrangements, which can be connected directly or indirectly to the pivot arms. In this case, the invention proposes that the pivot drives are connected to the tensioning roller opposite free end of the pivot lever, so that the pivot axis between the tension roller or tension roller bearing and articulation of the pivot drives is arranged. In a modified embodiment, however, there is also the possibility that the pivot drives between the support roller and the tension roller engage the pivot lever. The embodiments of the invention described hitherto as preferred embodiments provide, in addition to the back-up roll, a tensioning roll, the application head then applying against the band in a functional position between the back-up roll and the tensioning roll. In a simplified modified embodiment, however, in principle it is also possible to work without such a tension roller, in which case only the support roller and / or the applicator head must be moved to change the functional position, so that the applicator head either against the support roller or against a free belt area works next to the back-up roll.

The strip coating devices according to the invention are regularly part of a coil coating plant, which usually consists of several coil coating devices, wherein in particular a plurality of coil coating devices can be provided on the one hand an upper side and on the other hand, a lower side coil coating. The described embodiments can be combined with each other.

The invention is based entirely on the recognition that a flawless strip coating with a flexibly suitable for a variety of applications strip coating device is possible if one and the same coil coating device can be operated optionally in different functional positions, on the one hand a coating against the backing roll and on the other hand, a coating against the Allow tape tension or against the free tape. This is possible in a structurally particularly simple manner, for example, by the described rotary and / or pivoting racks, whereby it is possible to work with minimal adjustment paths of the associated application heads. This facilitates handling by operating on the devices operators. Incidentally, the entire strip guide within a continuous pass in a coil coating system is not or only slightly influenced by the change of the functional positions, so that in particular the tape guide in the area downstream furnaces is not adversely affected.

Fig. 1

eine Bandbeschichtungsanlage mit mehreren erfindungsgemäßen Bandbeschichtungsvorrichtungen in schematischer Darstellung,

Fig. 2a

eine Ausführungsform einer erfindungsgemäßen Bandbeschichtungsvorrichtung in einer ersten Funktionsstellung,

Fig. 2b

die Bandbeschichtungsvorrichtung nach Fig. 2a in einer zweiten Funktionsstellung,

Fig. 3

die Bandbeschichtungsvorrichtung nach Fig. 2b in einer Frontansicht (ohne Band und ohne Auftragskopf),

Fig. 4

den Gegenstand nach Fig. 3 in einer Seitenansicht aus Richtung des Pfeils A in der ersten Funktionsstellung,

Fig. 5

den Gegenstand nach Fig. 3 in einer perspektivischen Ansicht aus Richtung des Pfeils A,

Fig. 6

den Gegenstand nach Fig. 3 in einer perspektivischen Ansicht aus Richtung des Pfeils B,

Fig. 7a

eine abgewandelte Ausführungsform einer erfindungsgemäßen Bandbeschichtungsvorrichtung in einer ersten Funktionsstellung,

Fig. 7b

die Bandbeschichtungsvorrichtung nach Fig. 7a in einer zweiten Funktionsstellung und

Fig. 8

die Bandbeschichtungsvorrichtung nach Fig. 7a in einer Frontansicht (ohne Band und ohne Auftragskopf).

In the following the invention will be explained in more detail with reference to drawings showing merely exemplary embodiments. Show it

Fig. 1

a strip coater with a plurality of coil coating devices according to the invention in a schematic representation,

Fig. 2a

an embodiment of a strip coating device according to the invention in a first functional position,

Fig. 2b

the strip coater after Fig. 2a in a second functional position,

Fig. 3

the strip coater after Fig. 2b in a front view (without tape and without gun),

Fig. 4

the object after Fig. 3 in a side view from the direction of the arrow A in the first functional position,

Fig. 5

the object after Fig. 3 in a perspective view from the direction of the arrow A,

Fig. 6

the object after Fig. 3 in a perspective view from the direction of arrow B,

Fig. 7a

a modified embodiment of a strip coating device according to the invention in a first functional position,

Fig. 7b

the strip coater after Fig. 7a in a second functional position and

Fig. 8

the strip coater after Fig. 7a in a front view (without band and without applicator head).

In Fig. 1 is shown in a schematic representation of a strip coating system for metal strips M, in which the metal strip M to be coated passes through a plurality of coil coating devices. At the bottom of the Fig. 1 a first coating device 1 according to the invention for a top-side coating of the band M is shown. Immediately above this, a second coating device 2 is likewise arranged for a top-side coating, to which a third coating device 3 for a bottom-side coating directly in the strip running direction of the band connects. After passing through one or more of these coating devices 1, 2, 3, the strip enters an oven 4, with which the liquid applied coating materials are cured. Optionally, there is then the possibility that the band coated on the upper side and / or underside with the described coating devices 1, 2, 3 is the one in the upper left region of the Fig. 1 passes through further coating devices 1 ', 2', 3 'shown, in order to apply further coatings on the top side and / or bottom side. An optional further oven 4 'then adjoins these optional coating devices 1', 2 ', 3'.

Each of the coil coating devices 1, 2, 3, 1 ', 2', 3 'has an application head 5 for applying liquid coating materials, for example paints, to the belt, wherein each application head 5 has at least one applicator roll 6 which applies the lacquer applying the tape. In the exemplary embodiment, the application heads 5 are designed as three-roller heads, which in addition to the actual applicator roller 6 have a pickup roller 7 and a metering roller 8 arranged between the pickup roller 7 and the applicator roller 6. The pickup roller 7 picks up the coating material and delivers it via the metering roller 8 to the applicator roller 6. The structure of these known application heads is exemplary in the Fig. 7a . 7b shown. The entire application head 5 can be moved, so that, depending on the mode of operation, the respective application head 5 can be moved out of the band area or driven in the band area. Thus, for example, it is possible to perform only a top-side coating with the strip coating device 1, while the application heads 5 of the strip coating devices 2, 3 have moved out of the strip area. If, on the other hand, both top-side and bottom-side coating are to be carried out, this can be done with the application heads 5 of the coil coating devices 2, 3, while the application head 5 of the coil coating device 1 is moved out of the band area. The same applies to the optional coil coating devices 1 ', 2', 3 '.

Each of the strip coating devices 1, 2, 1 ', 2' according to the invention has, on the side of the strip M opposite the application head 5, a support roller 9 which in the exemplary embodiment is looped around by a predetermined wrap angle by the strip to be coated. The back-up rolls 9, which are also referred to as spools, regularly have a larger diameter than the applicator rolls 6. The strip coating devices 1, 2 according to the invention are characterized in that the applicator head 5 can be used either in a first functional position of the strip coating device 1, 2 operates directly in the support region of the support roller 9 or in a second functional position of the coil coating device 1, 2 in a free band area outside the support region of the support roller 9 on the tape. This arises, for example, in a comparative analysis of Fig. 2a and 2 B (or the Figure 7a . 7b ), which show, moreover, that the support roller 9 is additionally assigned a tension roller 10 on the side of the metal belt M opposite the application head 5. Fig. 2a (or 7a) shows the coil coating device 1, 2 in a first functional position, in which the application head 5 is arranged directly in the support region of the support roller 9, so that the application roller 6 is supported against the support roller 9 with the interposition of the belt M to be coated. This mode of operation lends itself in particular to the coating of thicker strips, in which a contamination of the support roller 9 is precluded by the then sufficient distance between the application roller 6 on the one hand and the support roller 9 on the other hand. On the other hand, if thin strips are to be coated, then the strip coating device 1, 2 can be made of the type described in US Pat Fig. 2a (or 7a) illustrated first functional position in the in Fig. 2b (or 7b) show shown second functional position. It can be seen that the application head 5 or its Application roller 6 no longer works against the support roller 9, but against the strip tension, that is, the applicator roller 6 is in a free band area between the support roller 9 on the one hand and the tension roller 10 on the other hand against the tape. In this respect, the figures show that the distance a of the surface of the applicator roll 8 from the surface of the support roller 9 in the first functional position, for. B. for coating thicker strips (thickness about ≥ 0.3 mm), corresponds approximately to the thickness of the strip to be coated, so that the application roller 6 (directly) with the interposition of the belt M against the support roller 9 abuts (see. Fig. 2a . 7a ). In contrast, the show FIGS. 2b or 7b that the distance a or b of the surface of the applicator roller 6 from the surface of the support roller 9 and / or the surface of the tension roller 10 in the second functional position, for. B. for coating thin strips (thickness about <0.3 mm) by a predetermined amount greater than the thickness of the strip M. It is expedient if the distance a and b, although larger than the strip thickness, are chosen to be relatively small in order to ensure optimum fixing or guiding of the strip. In the exemplary embodiment, the distances a and b may be less than 10 mm, if possible less than 5 mm.

Incidentally, the show FIGS. 2b and 7b in that the wrap angle α of the band M around the applicator roller 6 in the second functional position is less than 40 °, preferably less than 30 °. In the exemplary embodiment, the angle α is between 10 ° and 20 °. It can be adjusted by adjusting the immersion depth of the applicator roller 6 in the area between the support roller 9 and the tension roller 10.

The support roller 9 and the tension roller 10 are arranged according to the invention in a common roller frame 11, wherein the position of the support roller 9 and / or tension roller 10 is adjustable within this roller frame for the change from a functional position to the other functional position. Of the Changing the functional position takes place primarily by changing the position of the support roller and / or tension roller. The gun must be moved only slightly to adapt to the functional position.

The Fig. 2a and b and FIGS. 3 to 6 show an embodiment of a coating apparatus 2 according to the invention, in which the tensioning roller 10 and the support roller 9 are each rotatably mounted in a bogie 12, this bogie 12 itself being rotatably mounted in the roller frame 11. The coating device 2 is thus brought by rotation of the bogie 12 from the first functional position to the second functional position and vice versa, the bogie 12 has two the support roller 9 and the tension roller 10 frontally interconnecting rotating arms 13. The Fig. 4 . 5 and 6 show the coating device 2 in accordance with in the first functional position Fig. 2a , wherein the band M itself and also the application head 5 are not shown in these figures. The Fig. 3 shows the coating device 2 in the second functional position according to Fig. 2b , wherein here also the representation of the band M and the application head 5 has been omitted.

The figures also show that the support roller 9 and the tension roller 10 are respectively mounted on the end side of the rotary arms 13, wherein the bogie or its pivot arms 13 about a between the axes of rotation 14, 15 of the rollers 9, 10 arranged rotation axis 16 is rotatable. A comparative analysis of the Fig. 2 to 6 makes it clear that in the course of turning the bogie 12, both the position of the support roller 9 and the position of the tension roller 10 is changed, since the axis of rotation 16 of the bogie 12 between the tension roller 10 and support roller 9 and its axes of rotation 15, 14 is arranged , The change of functional positions via rotary actuators 17, wherein Fig. 3 shows that each rotary arm 13 is assigned a respective rotary drive 17. In the embodiment, these rotary actuators 17 are not directly connected to the rotating arms 13, but rather are linear actuators, which are connected via a suitable transmission lever 18, 19 to the rotating arms 13. Fig. 3 shows that the connection via such transmission lever 18, 19 is formed differently on the two sides of the rollers 9, 10. Fig. 6 shows the right area according to Fig. 3 from the direction of arrow B, wherein here the transmission lever is designed as a crank 18, which converts the stroke of the cylinder piston assembly 17 in a rotational movement of a connecting shaft 20 which is connected to the rotary arm 13. In contrast, shows Fig. 5 the left portion of the rollers 9, 10 according to Fig. 3 from the direction of the arrow A, in which case the cylinder piston arrangement 17 is connected eccentrically to a turntable 19. In Fig. 5 It can also be seen that this turntable 19 has an opening 21 for a drive shaft 22 of the support roller 9, wherein a corresponding rotary drive 23 for the support roller 9 can be flange-mounted on this drive shaft 22. This is in Fig. 3 merely hinted.

Incidentally, in Fig. 1 indicated that the coating device 2 described in detail for the top-side coating of the strip immediately downstream of a conventional coating device 3, which allows a bottom-side coating of the tape. In this respect, it is a conventional coating device 3, in which the applicator head 5 from the underside of the belt against the belt M works without here a backup roller is provided. This application head 5, like the other application heads 5, can be moved, so that it can be moved out of the area of the belt if it is desired to dispense with underside coating. In the Fig. 2a and 2 B the application roller 6 of this supplementary application head 5 is indicated in a functional position, in which a complementary underside coating of the tape takes place. In the event that this supplementary application head 5 is not used, a supplementary auxiliary roller 24 is provided, which in Fig. 2b is indicated and against the tape is movable. In Fig. 4 It can be seen that this auxiliary roller 24 is arranged raised and lowered on the roller frame 11 of the coating device 2, wherein the auxiliary roller 24 is rotatably mounted on a carrier 25, which carrier 25 guided on linear guides 26 and 27 movable by means of a cylinder piston assembly connected to the carrier , namely, can be raised and lowered.

While the previously treated FIGS. 2 to 6 an embodiment of the invention using the example of the second coating device 2 according to Fig. 1 show, it is in the arranged below the first coating device 1 according to Fig. 1 a modified embodiment of the invention in which the tension roller 10 and the support roller 9 are not moved together in a bogie, but in which the tension roller 10 is rotatably mounted on a pivot frame 28, wherein the tension roller 10 with this pivot frame 28 for the change out the first functional position is pivoted into the second functional position relative to the support roller 9. This modified embodiment is described in detail in FIGS Fig. 7a . 7b and 8th shown. Fig. 7a shows the coating apparatus 1 in the first functional position, in which the application head 5 operates directly against the support roller 9. The tensioning roller 10 is pivoted out of the area of the metal strip M with the aid of the pivoting frame 28. For pivoting the pivot frame 28 about the pivot axis 36, pivot drives 30 are connected to the pivot arms 29, which are designed as cylinder piston arrangements. These rotary actuators or cylinder piston assemblies 30 are on the one hand pivotally connected to the roller frame and on the other hand pivotally connected to the pivot lever. The tensioning roller 10 is mounted end on one side of the pivot axis 36, while the pivot drives 30 are connected end to the other end of the pivot arms 29, so that the pivot axis 36 between the rotation axis 15 and the tension roller 10 and the pivot point of the pivot drives 30 is arranged , Now, for example, in the coating of thin strips not against the support roller 9, but coated against the free band, so can the band coating device 1 from the in Fig. 7a shown first functional position in the in Fig. 7b transfer illustrated second functional position. For this purpose, the pivoting frame 28 is pivoted by means of the pivoting drives 30 and thus the tensioning roller 10 is pivoted against the metal belt M. In addition, a comparative analysis of the Fig. 7a and 7b in that the application head 5 is advanced by a small amount in its linear guide 31 by means of a drive 32 against the belt. Thus, the application head 5 presses with its application roller 6 between the back-up roller 9 and tensioning roller 10 against the metal strip M. In addition, shows a comparative analysis of Fig. 7a and 7b in that, in addition, the support roller 9 has been lowered within the roller frame 11 by a predetermined amount. For this purpose, the support roller 9 is rotatably mounted on a lifting frame 33, which can be raised or lowered in a lifting drive 34. The lifting drive 34 is also designed as a cylinder piston assembly. The lifting frame 33 is guided via linear guides on guide rails 35 of the roller frame 11.

Claims (15)

1. A strip coating device (1, 2) for coating strips, particularly metal strips (M),
   with at least one application head (5) for applying coating substances onto a strip passing through the coating device (1, 2), wherein the application head (5) features at least one application roll (6) that applies the coating substance onto the strip (M), and
   with at least one back-up roll (9) that is arranged on the side of the strip that lies opposite of the application head (5), as well as at least one tension roll (10) that is arranged on the side of the strip (M) that lies opposite of the application head (5),
   wherein the application head (5) selectively acts upon the strip either in the supporting region of the back-up roll (9) in a first functional position of the strip coating device (1, 2) or in a free strip region between the back-up roll (9) and the tension roll (10) in a second functional position of the strip coating device (1, 2),
   characterized in that the back-up roll (9) and the tension roll (10) are arranged in a common roll stand (11), wherein the position of the back-up roll (9) and the tension roll (10) can be adjusted within the roll stand (11) in order to change from one functional position into the other functional position.
2. The device according to Claim 1, characterized in that the distance (a) of the surface of the application roll (6) from the surface of the back-up roll (9) approximately corresponds to the thickness of the strip (M) to be coated in the first functional position, e.g. in order to coat thick strips, and in
   that the distance (a, b) of the surface of the application roll (6) from the surface of the back-up roll (9) and/or from the surface of the tension roll (10) is greater than the thickness of the strip to be coated by a predetermined dimension in the second functional position, e.g. in order to coat thin strips.
3. The device according to Claim 2, characterized in that the distance (a, b) of the surface of the application roll (6) from the surface of the back-up roll (9) and/or from the surface of the tension roll (10) is smaller than 20 mm, preferably smaller than 10 mm, e.g. smaller than 5 mm, in the second functional position of the strip coating device (1, 2).
4. The device according to one of Claims 1 to 3, characterized in that the angle of wrap (α) of the strip (M) around the application roll (6) is smaller than 40°, preferably smaller than 30°, e.g. 10° to 20°, in the second functional position.
5. The device according to one of Claims 1 to 4, characterized in that the tension roll (10) and the back-up roll (9) respectively are rotatably supported in a rotary stand (12), wherein the rotary stand (12) is itself rotatably supported in the roll stand (11).
6. The device according to Claim 5, characterized in that the rotary stand (12) features at least two rotatable arms (13) that connect the back-up roll (9) and the tension roll (10) to one another on the face side.
7. The device according to Claim 6, characterized in that the ends of the back-up roll (9) and the tension roll (10) are respectively supported on the rotatable arms (13), and in that the rotary stand (12) is rotatable about a rotational axis (16) that is arranged between the rotational axes (14, 15) of the rolls (9, 10).
8. The device according to one of Claims 5 to 7, characterized in that one or more rotary drives (17) are connected to the rotary stand (12), e.g. to one or more rotatable arms (13).
9. The device according to Claim 8, characterized in that the rotary drives (17) are realized in the form of linear drives, e.g. piston-cylinder arrangements, that are connected to the rotatable arms (13) directly or via at least one transmission lever (18, 19).
10. The device according to Claim 9, characterized in that the transmission lever is realized in the form of a crank (18) or rotatable disk (19).
11. The device according to one of Claims 1 to 4, characterized in that at least the tension roll (10) is rotatably supported on a pivoting stand (28), wherein the pivoting stand (28) is pivotably supported on the roll stand (11), and wherein the tension roll (10) can be pivoted with the pivoting stand (28) in order to change from one functional position into the other functional position.
12. The device according to Claim 11, characterized in that the pivoting stand (28) features at least two pivotable arms (29) that can be pivoted with the tension roll (10) in order to change the functional position, wherein the tension roll (10) is supported on these pivotable arms (29).
13. The device according to Claim 11 or 12, characterized in that one or more pivoting drives (30) are connected to the pivoting stand (28), e.g. on one or more pivotable arms (29).
14. The device according to Claim 13, characterized in that the pivoting drives (30) are realized in the form of linear drives, e.g. piston-cylinder arrangements.
15. The device according to one of Claims 12 to 14, characterized in that the back-up roll (9) is guided within the roll stand (11) such that it can be displaced, e.g. raised and lowered.

Images