EP1949982B1 - Roller device and method for rolling in connector bridges in profiles - Google Patents

Description

background

The invention relates to a rolling device for rolling of connecting webs in profiles, with a passage opening for the profiles and on both sides of the passage opening opposite groups of rotatable coplanar rolling mill according to the preamble of claim 1. Furthermore, the invention relates to a method for rolling of connecting webs in profiles according to the preamble of claim 14.

State of the art

It is known to form metal profiles, eg for windows, doors and facades, of metal profile parts, which are connected via webs of a material which is less thermally conductive than the metal of the profiles. In particular, webs made of plastic are used. In a known procedure, the webs are first introduced on both sides in grooves of the profile parts. Thereafter, a definitive attachment of the webs to the profiles in a rolling apparatus, in which side walls of the grooves are plastically deformed by rollers, so that the webs are held in the grooves. FIG. 1 schematically shows such a procedure in which a profile 10 of a first profile part 11 and a second profile part 12 is formed. The parts 11 and 12 may be aluminum profiles. Webs 13 and 14, for example made of plastic, have been inserted into grooves of the profile parts 11 and 12 and connect these profile parts. The profile 10 thus formed, which can be several meters long, then passes through the rolling device, in which pairs of rollers 2 and 3 with disc-shaped rollers 4, 5 and 6, 7 on opposite sides of the profile act on the Nutenränder and plastically deform, so that the webs are rolled into the grooves and thereby secured. As a rule, a plurality of roller pairs are provided in succession in the direction of passage, which effect the deformation correspondingly in several steps. The rollers of each roller pair lie on a common shaft. In the FIG. 1 the waves are indicated only with their central longitudinal axes 8 and 9. To adapt to the profiles, or the distance defined by the webs of the profile parts, at least one of the rollers of each pair of rollers along the common shaft is adjustable in order to adjust the distance a between the rollers can. Rollers 65 to 68 support the profile 10 as it passes through the mill. Such rolling devices have proven successful, but the releasable attachment of the adjustable rolling disks on the shafts is structurally complex. Further, other than the illustrated profile form may require more than one pass through the rolling apparatus. It is known to measure the force exerted by the rolling discs on the profiles, whereby only the total force of the pair of rollers is measurable. Out EP-A 82 468 is the rolling with inclined outer discs known. The adjustment of the distance of the rolling disks is done by replacing the whole tool carrier. In the method according to DE-B 27 55 669 is also used with inclined rolling discs and also only one-sided. Setting the distance is not addressed.

Presentation of the invention

The invention has for its object to provide an improved rolling device. Furthermore, the curl method of the type mentioned is to be improved.

The object is achieved with a rolling device of the type mentioned, in which at least one of the groups two rolling disks of the group are rotatably supported by means of separate axes or shafts and an axis or shaft of each group is displaceable in its longitudinal direction to adjust the rolling disk spacing.

Due to the fact that the axes or shafts of the two rolling disks are separate elements, each rolling disk can be fixed permanently or non-detachably on its axle or shaft and the distance adjustment of the rolling disks takes place by the adjustment of the axles or shafts to each other. This allows a simpler adjustment and a mechanically stable arrangement of the rolling disks and thus ensuring the parallelism of the rolling disks of the group. The given by the separate axes or waves decoupling of the geometric axes of rotation of the two discs allows settings in which the axes or shafts of the two discs are not coaxial. This in turn allows the rolling of profiles in one pass even with profile shapes that previously required more than one pass through the rolling device.

In particular, each group of rolling disks has two disks and thus a pair of rollers. This allows profiles to be rolled up with two bars. The groups could also include additional roll disks for other profile shapes with more lands.

In a preferred embodiment, in addition, both axes or shafts of a group are displaceable together in their longitudinal direction in order to adjust the rolling disks together. This allows easy adaptation of the device to profile shapes, in which the webs are arranged offset to one another. In an alternative or additional preferred embodiment for adjustment at least one axis or shaft of a group transversely to its longitudinal direction adjustable so that this leads to the enlargement or reduction of the passage opening of the device for the profile. This allows profiles to be rolled up in one operation, in which the rolling rollers do not have to engage in the same rolling plane.

In a preferred embodiment, one rolling disk of each group is fixed to a driven shaft and another rolling disk of the group or pair is attached to a revolving axle. This allows full freedom in the adjustment. In particular, rolling disks of a group can be drive-connected via an insertable driver element, in particular via a shaft connecting the shaft and axle, if the adjustment possibilities in the transverse direction to the axles or shafts are not required. It is preferred for the simple design of the rolling device despite extensive exhaustion of Verstellfähigkeiten when arranged on one side of the flow-through roller groups, the other adjustment of the roller discs or their axes and waves have as the roller groups on the opposite side of the passage opening. In a preferred embodiment, the force which the rolling disks exert on the profile can be measured separately for the rolling disks of a pair of rolling disks.

In a particular embodiment, the groups of rolling disks are pivotable about the passage opening. This allows the adaptation of the rolling or rolling device to the feed position of the profiles, which are supplied due to their irregular shape in the resting on a transport element feed with non-vertical Nutenrändern. Instead of a rotation of the profiles, the groups of the rolling disks are thus preferably rotated, so that the rolling disk position adapts to the position of the Nutenränder in space.

The invention is further based on the object to improve a method for rolling heat-insulating webs in metal profiles.

This is done in the method with the features of claim 14.

This results in new adjustment options compared to the arranged on a common shaft rolling disks such that profiles can be rolled in one pass, in which more than one pass has been needed or that profiles are rolled with fewer passes.

In a preferred embodiment, the axis of rotation of a rolling disk of a group, or a pair, is adjusted in the longitudinal direction of the axis of rotation and in the transverse direction to the axis of rotation in the direction of action or against the direction of action of the rolling disk for adaptation to the profile.

Brief description of the drawings

• Figur 1 schematisch eine Walzvorrichtung nach Stand der Technik;
• Figur 2 schematisch eine Walzvorrichtung gemäss der Erfindung bei der Bearbeitung des Profils von Figur 1;
• Figur 3 schematisch eine Walzvorrichtung gemäss der Erfindung bei der Bearbeitung eines anderen Profils;
• Figur 4 schematisch eine Walzvorrichtung gemäss der Erfindung bei der Bearbeitung noch eines anderen Profils;
• Figur 5 die Lagerung einer Gruppe bzw. eines Paars von Walzscheiben;
• Figur 6 die Lagerung gemäss Figur 5, bei welcher die Walzscheiben über einen Mitnehmer antriebsverbunden sind;
• Figur 7 eine Gesamtansicht einer Walzvorrichtung; und
• Figur 8 eine Gesamtansicht einer Ausführungsform der Walzvorrichtung.

Reference to the figures, embodiments of the invention will be explained in more detail below. It shows

• FIG. 1 schematically a rolling device according to the prior art;
• FIG. 2 schematically a rolling device according to the invention in the processing of the profile of FIG. 1 ;
• FIG. 3 schematically a rolling device according to the invention in the processing of another profile;
• FIG. 4 schematically a rolling device according to the invention in the processing of yet another profile;
• FIG. 5 the storage of a group or a pair of rolling disks;
• FIG. 6 storage according to FIG. 5 in which the rolling disks are drive-connected via a driver;
• FIG. 7 an overall view of a rolling device; and
• FIG. 8 an overall view of an embodiment of the rolling device.

Ways to carry out the invention

FIG. 1 shows the already explained at the outset with reference to this figure procedure in the formation of thermally insulated metal profiles according to the prior art. Reference is made to the above explanations.

FIG. 2 shows in a likewise schematic representation of a rolling of the webs 13 and 14 in the parts 11 and 12 of the metal profile 10 with a device or with the method according to the invention. Same reference numerals as in FIG. 1 again denote the same elements, which also applies to the other figures. Also in FIG. 2 and the following figures, only one group 2 with rolling disks or pulleys 4,5 and another group 3 with the rolling disks 6 and 7 is shown. These two groups of rolling disks lie on both sides of the passage opening 25 (FIG. FIG. 7 ) of the device through which the profile 10 passes through the device. The rolling device has a plurality of such groups on both sides of the passage opening or of the profile 10, which are arranged along the passage opening in the direction of passage, so that the profile is applied on both sides several times by rolling disks during the pass to achieve the rolling of the webs in several stages , The corresponding slightly converging setting of the opposing roll groups is known to the expert or the operator of rolling devices of this type and will not be further discussed and addressed, but also applies to the roll groups according to the present invention. In the FIGS. 1 and 2 and in the further figures, the further groups of rolling disks are behind the plane of the paper of the drawing and are therefore not apparent. The drawings thus each show the inlet for the profile in the flow opening with the first group of rollers on both sides. It is known to the person skilled in the art how to arrange such groups of rolling disks in succession in a machine frame of the rolling apparatus and drive them with individual or common drives. This will not be explained further here. Furthermore, pairs of rollers are shown in this and the other figures, so that the mentioned group of rolling disks each comprise two disks. However, it could also be provided for special profiles with further webs that, in addition to the two illustrated rolling disks of each group, one or more further rolling disks occur. For these further rolling disks, it may be that according to the invention they are arranged on separate shafts or axles or have common shafts or axes with other rolling disks of the group, as is known in the prior art. According to the invention, it is provided that at least one of the pairs of rollers has separate axes or shafts. In this and the other figures, this is illustrated for both groups or for both pairs of rollers and it is preferred that all groups of the rolling device are designed in this way.

FIG. 2 shows now that the rolling disk 4, which is the upper roll of the roller pair or group 2, has its own axis or shaft 18, by means of which the rolling disk 4 is rotatably mounted (bearing 57). The other rolling disk 5 of the pair of rollers 2 has its own axis or shaft 19, by means of which it is rotatably mounted (bearing 52). Due to the separate shafts / axes, the bearings of the two rolling disks 4 and 5 of the group 2 and the roller pair 2 are independent of each other. In FIG. 2 are the bearings for the shaft or axle 18 and 19 only indicated. In FIG. 5 is an example of the bearing of the shafts or axles explained in more detail.

Corresponding to the group 2 is on the opposite side of the profile 10 and the flow opening in the apparatus, the pair of rollers 3, and the group 3, provided, one rolling disc 6 is rotatably supported by the shaft or shaft 20 in the rolling device (bearing 57) and the other rolling disc 7 is rotatably supported by its axis or shaft 21 ( Bearing 52). This storage by means of separate axles or shafts of course allows the per se known setting of the distance a between the rolling disks. For this purpose, either the axis or shaft 18 in the direction of its longitudinal central axis is adjustable in the rolling device, as indicated by the arrow A. Or, as will be shown later, the storage unit 28 (FIG. FIG. 7 ) for the shaft or axle in the longitudinal direction adjustable. In any case, while the rolling disk 4 always remains firmly connected to its associated shaft or shaft 18, so that the setting of the distance a can be solved structurally easier than in the prior art, in which the rolling disk slidably disposed on its drive shaft and be detachable and fastened must to adjust the distance a. By die.Ausgestaltung according to the invention, there is less the risk that the rolling disk to be adjusted after adjustment no longer coplanar with the other rolling disk. Instead of the rolling disk 4, of course, the rolling disk 5 can be adjusted to adjust the distance a by adjusting its axis or shaft 19. The above also applies to the adjustment of the distance a in the pair of rolling disks 6, 7 or group 3.

However, the separate pivot bearing of the rolling disks of a group or a pair allows in a preferred embodiment, the processing of profiles, which can not be processed in one pass with rolling disks on the same axis or shaft. So shows FIG. 3 again the schematically simplified representation according to the FIG. 2 wherein a profile 10 is machined with a different shape. In this form, the web 14 has a bend and the groove of the upper Profile part 12, which receives the web, is not vertically above the corresponding groove of the lower profile part 11, but is offset in contrast. The pivot bearing of the rolling disk 6 with its own axis of rotation or shaft 20 now gives the possibility to move this rolling disk 6 relative to the other rolling disk of the roller pair 3 according to arrow B transverse to the longitudinal central axis (arrow A) of the axle or shaft 20 such that a Magnification (or for another profile shape a reduction) of the passage opening 25 for the profile results. It results for the illustrated profile 10 in FIG. 3 shown position in which the rolling disk 6 is moved with its axis or shaft 20 in the figure to the right. The design of a bearing unit for the axle or shaft 20, which allows the adjustment shown, the skilled person readily possible. A preferred embodiment of the storage unit is in FIG. 5 and FIG. 6 shown. Of course, in the rolling apparatus, the adjustment shown is also to be made for the other groups along the passage opening.

In the separate storage of shafts or axles and in particular in the version with transverse adjustment according to FIG. 3 , a separate force measurement for the individual rolling disks of the group can be provided, with which the force is measured, which exerts the respective rolling disc on the profile. This results in the advantage that differences in force caused by tolerance differences in the profile can be detected and, if necessary or desired, can be corrected by adjusting one of the rollers in the transverse direction (arrow B). To measure the force any commercially available sensors, such as piezoelectric sensors, can be used with the appropriate evaluation electronics.

FIG. 4 shows a further preferred embodiment for producing a further profile shape, in which the web 13 is offset relative to the web 14 down. To edit such a profile both rolling disks 4 and 5 of the group or of the pair 2 together, adjusted by adjusting their axis or shaft, according to arrow C, so that the in FIG. 4 The position shown results in which these rolling disks of group 2, as seen in the figure, come to lie below the corresponding rolling disks 6 and 7 of group 3. This adjustment of both rolling disks 4 and 5 can be accomplished simpler and more precisely by the corresponding adjustment of the respective axles 18 and 19 or their brackets than the adjustment of two rolling disks on a common axis, which is structurally complex and has problems with the coplanar position of the rolling disks can result. A preferred embodiment of the bearing units for corresponding adjustment of the axes / shafts is in FIG. 7 shown.

The in the Figures 3 and 4 Adjustments shown can both be provided in each case in all groups of rolling disks. However, it is preferred if different adjustment possibilities are provided in the groups or roller pairs lying on both sides of the passage opening, so that the groups on the one side of the passage opening have different adjustment options than the groups on the other side of the passage opening. So it may be in particular that, as in the Figures 3 and 4 would be shown in sync, on the one side of the passage opening according to the transverse adjustment FIG. 3 a rolling disc for the groups of rollers is provided on this side of the passage opening and the longitudinal adjustment in the longitudinal direction of the axes or waves for both rolling discs of a group according to FIG. 4 is provided for the groups on the other side of the passage opening. A corresponding rolling device is based on FIG. 7 explained in more detail.

The Figures 5 and 6 show an embodiment of the adjustment according to FIG. 3 , in which thus the one rolling disk in the transverse direction to the enlargement or reduction of the passage opening for the profile is adjustable.

FIG. 5 shows according to an embodiment of the storage and support of the pair of rollers 6 and 7 of FIG. 3 in more detail, in which case in the drawing upper roller 6 in the transverse direction B to the longitudinal direction (arrow A) of the axis 20 of the roller disc is displaceable, wherein the displacement to the passage opening towards or away from, so that the passage opening by the displacement in the direction of B reduced or enlarged. The FIG. 5 shows a displacement in which the passage opening 25 ( FIG. 7 ) has been reduced. In the embodiment of the roll holder of group 3 or of the roll pair 3 with the rolls 6 and 7, both rolls are arranged on a common slide 50, which is arranged on a main support 40 of the rolling device, comprising a machine frame 1 (FIG. FIG. 7 ) having. On the carriage 50, a holder 51 is fixed, which rotatably supports the shaft 21 of the rolling disk 7 via bearings 52. The shaft 21 is driven by a drive 54, not shown, as is generally known in the rolling devices. This drive, for example, an electric motor, not shown, moves with the carriage 50 or has drive means which allow the drive of the displaceable shaft 21 from the fixed motor. On the carriage 50, a slide guide 53 and a further slide 55 is further arranged, which, driven by a drive, not shown, or manually adjustable, can perform a movement in the direction of arrow B, to effect the adjustment in the transverse direction. On the carriage 55, a holder 56 is arranged, which supports the axis 20 of the rolling disk 6 via the bearings 57. Thus, the rolling disk 6 has an axis 20 which is separate from the shaft 21 of the rolling disk 7 of the group or of the roller pair 3. By the adjustment of the carriage 55 on the slide 53rd in the direction of arrow B, the adaptation of the rolling disk 6 to the profile shape corresponding to FIG. 3 respectively. The rolling disk 6 is not driven in this case, but could be provided with its own drive, so that instead of the revolving axis 20, a shaft would be provided.

FIG. 6 shows the group 3 of FIG. 5 in another position of the carriage 55, in which the shaft 21 and the axis 20 of the roller pair 6, 7 are aligned and thus the two rollers protrude equally far into the passage opening 25 or limit same. In this position, it is possible, according to a particular embodiment of the invention, to provide an insertable or removable driver element 58, which forms a drive connection between the driven shaft 21 and the revolving axle 20, which thus also assumes the function of a shaft. This driver element 58 and the corresponding recesses 59 and 60 in the shaft 21 and the axle 20 are formed with (not shown) positive driver parts, eg with gears which transmit the driving force from the shaft 21 to the axis 20 via the driver 58. In this way, in the aligned arrangement of shaft 21 and axis 20 according to FIG. 6 also the upper roll plate 6 are driven. Set against the aligned position of FIG. 6 a transversely shifted position of the upper roll plate are adjusted, for example according to FIG. 5 , In this example, the driver element 58 is pulled upwards, after which, about the explained adjustment of the carriage 55, a transversely displaced position of the upper roll plate can be achieved.

FIG. 7 shows the described carriage 50 on the main support 40, which is arranged on the machine frame 1 of the rolling device. By a drive 71, which will not be explained in detail here, the entire carriage 50 can be used to increase or decrease the passage opening 25 in the transverse direction to the longitudinal axes the shafts 21 and the axes 20 are moved, so also in the direction of arrow B. By the displacement of the carriage both rollers of the respective roller pair 3 are adjusted together. The carriage 50 can be a common carriage for all groups of rollers 3 along the passage opening or several carriages can be provided.

On the left side of the FIG. 7 is on the other side of the passage opening 25 arranged roller pair 2 with the rolling rollers 4 and 5 can be seen. In these groups or these pairs of rollers, of which in the figure, as mentioned, only the foremost pair of rollers is visible, the common height adjustment of the rolling discs of the groups 2 according to FIG 4, for example, realized that at the main support 40 of the machine frame 1 of Device slide guides 34 are provided on which a, relative to the position in the figure, vertically adjustable slide 32 is arranged with its guide 33. On this carriage 32 a lower bracket 30 is provided in the figure, which in turn via bearings, in particular in the same manner as in the Figures 5 and 6 shown, the shaft 19 of the rolling disk 5 rotatably supports. The rolling disk 5 or its shaft 19 can be driven via a further, not shown, drive 35, for example an electric motor. The top plate 4 of the roller pair 2 in the figure is, in particular, the same way as in FIGS Figures 5 and 6 shown held rotatably in a holder 28 by means of bearings. It is to the explanations to the Figures 5 and 6 directed. The upper roll plate 4 may be non-driven with the rotating axis 18 or may be via a driver 58, as he described on the basis of Figures 5 and 6 has been described, also be driven by the drive 35 via the shaft 19 and the driver. The holder 28 is adjustable on the carriage 32 via a further vertical slide guide 36 and 37 in its vertical position. In order to the distance a between the rolling discs 4 and 5 can be adjusted.

Next adjusting devices for the horizontal guide rollers 65-68 can be seen, which will not be further explained here.

FIG. 8 shows a further preferred embodiment in which the arrangement of groups 2, 3 of rolling disks, and in particular also the horizontal guide rollers 65 to 68, of the rolling device can be rotated around the passage opening 25 around. FIG. 8 shows a rotational position relative to the horizontal bearing of the rolls of FIG. 7 , For this rotational adjustment, it is preferred if the groups 2, 3 and the guide rollers are arranged on a common, for example substantially annular, carrier 70, which is rotatably arranged in the machine frame 1. In particular, the main support 40 is rotatably arranged on the machine frame 1 by means of the carrier 70. Thus, the position of the rolling rollers and the guide rollers can be adapted to profiles which are supplied to the rolling device with non-vertical position of the rolling side walls to be rolled. This may in particular be the case with profiles, which rest on the feed on a, in particular horizontal, transport surface and there, because of the profile shape, the oblique position of the Nutenseitenränder results. The preferred rotatable arrangement of the groups and guide rollers then allows the direct introduction of the profiles into the passage opening of the rolling device without manipulation of the position of the profile.

Claims (15)

1. Rolling device for curling connection bridges (13, 14) into profiles (10), with a passage opening (25) for the profiles and groups (2, 3) located opposite of one another along the passage opening, rotativen and coplanar rolling discs (4, 5, 6, 7), characterized in that, for at least one of the groups (2, 3), two rolling discs (4, 5; 6, 7) of the group are beared in a rotatable way by means of axles or shafts (18, 19; 20, 21) which are separate from one another, and in that the one of the axles or one of the shafts (18, 19, 20, 21) of a group (2, 3) can be shifted in the direction of its longitudinal middle axis (A) in order to adjust the rolling disc distance (a).
2. Rolling device according to claim 1, characterized in that both axles or shafts (18, 19) of a group (2) can be shifted jointly in the direction of one of the longitudinal middle axes (A) in order to shift the rolling discs (4, 5) jointly.
3. Rolling device according to claim 1 or 2, characterized in that at least an axle or shaft (20) of a group (3) can be shifted in a direction (B) which is transversal with respect to the direction of its longitudinal middle axis (A), such that the passage opening (25) increases or decreases.
4. Rolling device according to one of the claims 1 to 3, characterized in that one rolling disc of a group is attached to an actuated shaft (19; 21) and another rolling disc (18, 20) of the group is attached to a rotating axle.
5. Rolling device according to one of the claims 1 to 4, characterized in that rolling discs of a group can be actuatably connected to each other by means of an insertable or removable respectively, carrier element (58), particularly by means of a rod-shaped carrier element connecting shaft and axle, which can be inserted in recesses (59, 60) in the shaft and the axle.
6. Rolling device according to one of the claims 1 to 5, characterized in that roll groups (2) are arranged on the one side of the passage opening (25), having other shifting possibilities of the rolling discs (4, 5) than the rolling discs (6, 7) of the groups (3) on the other, particularly opposite, side of the passage opening.
7. Rolling device according to claim 6, characterized in that the groups (2) of the one side comprise a joint shifting of the rolling discs of the group in the direction (A) of the longitudinal middle axis of an axle or shaft, beside the adjustment of the distance (a) of the rolls (4, 5) of each group with respect to one another, and in that the rolling discs (6, 7) of the groups (3) of the other side comprise a shifting of only one rolling disc (6) of each group (3) in a direction (B) transversal with respect to the longitudinal middle axis (A), beside the adjustment of the distance (a) of the rolls of each group with respect to one another, increasing or decreasing the passage opening.
8. Rolling device according to one of the claims 1 to 7, characterized in that, for a group or groups (2) of rolling discs (4, 5) at a machine frame (1) of the device, a first sliding carriage (32) which can be shifted in the direction (A) of the longitudinal middle axes of the axles or shafts is provided, in that a fixed arm (30) protrudes from the first sliding carriage, which carries a rolling disc (5), the shaft (19) of which can be actuated by an actuator (35) which is fixed to the machine, and in that an arm (28, 36), which is shiftable in the direction of the first sling carriage (32) or in the opposite direction and which carries a second rolling disc (4), protrudes from the first sliding carriage (32).
9. Rolling device according to one of the claims 1 to 8, characterized in that, for a group or groups (3) of rolling discs (6, 7) at a machine frame (40) of the device, a second sliding carriage (50) which is shiftable in a direction (B) transversal with respect to the direction (A) of the longitudinal middle axes of the axles or shafts, is provided, being shiftable towards the passage opening or in the opposite direction, in that an actuated rolling disc (7) of a group (3) is arranged on this second sliding carriage (50), in that a third sliding carriage (55) is arranged on the second sliding carriage (50), being shiftable in the same direction or in the contrary direction, at which an arm (56), which is shiftable in the direction of the longitudinal middle axes (A) of the shafts or axles of the group (3) and which carries a second rolling disc (6) of the group, is arranged.
10. Rolling device according to one of the claims 1 to 9, characterized in that the groups (2, 3) of rolling discs can be jointly pivoted around the passage opening (25).
11. Rolling device according to claim 10, characterized in that guide rolls (65 to 68) which can be adjusted in their position with respect to the passage opening can be jointly pivoted with the groups around the passage opening.
12. Rolling device according to one of the claims 10 or 11, characterized in that the groups and/or the guide rolls are arranged at a carrier (70) which is substantially annular and which can be rotated with respect to a fixed machine frame (1) of the device.
13. Rolling device according to one of the claims 1 to 12, characterized in that, for at least one group of rolling discs, a force measurement for the force exerted by the rolls onto the profile is provided, wherein the force measurement is done separately for the individual rolls.
14. Method for curling connection bridges (13, 14) into profiles (10), wherein the bridges are inserted into grooves of the profiles and are attached in the grooves by groups (2, 3), particularly pairs, of coplanar, rotating rolling discs (4 to 7) acting upon the groove edges from opposite directions, characterized in that the rotation axes of the rolling discs of a group or of a pair respectively, are decoupled from one another and the one axle or shaft (18, 19, 20, 21) of a group (2, 3) is shiftable in the direction of its longitudinal middle axis (A) in order to adjust the rolling disc distance (a).
15. Method according to claim 14, wherein both axles or shafts (18, 19) of a group (2) are jointly shiftable in the direction of one of the longitudinal middle axes (A) in order to shift the rolling discs (4, 5) jointly and wherein particularly at least an axle or shaft (20) of a group (3) is shiftable in a direction (B) transversal with respect to its longitudinal middle axis (A), such that an increase or a decrease of the passage opening (25) results and particularly roll groups (2) are arranged on the one side of the passage opening (25), having different shifting possibilities of the rolling discs (4, 5) than the rolling discs (6, 7) of the groups (3) on the other, particularly opposite, side of the passage opening.

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