Tensionable turning bar

Abstract

Turning bar (1) for guiding and / or deflecting a substrate web (10) at least partially wrapping around the turning bar (1), wherein the turning bar (1) has at least one substantially cylindrical and / or tubular turning bar body (2) with a center line (3) and at least one holding device (4) for fastening the turning bar (1) to a side wall (12) or a frame, characterized in that the turning bar (1) comprises at least one bracing device (5), wherein the bracing device (5) is designed such that the turning bar body (2) can be brought into a straight or a curved shape as seen in the extension of its center line (3).

Description

[0001] The invention relates to a turning bar for guiding and / or deflecting a substrate web at least partially wrapping around the turning bar, wherein the turning bar comprises at least one substantially cylindrical and / or tubular turning bar body with a center line and at least one holding device for fastening the turning bar to a side wall or a frame.

[0002] Turning bars are well known in the art and include a multitude of different variants. Turning bars comprise a turning bar body designed as a cylindrical structure, such as a metal tube, which usually has a polished and / or corrosion-resistant and / or wear-resistant coating, such as hard chrome plating, on its outer surface. In addition, a plurality of air outlet holes are usually provided on the outer surface of the turning bar body, and the turning bar is usually closed at one end and is usually pressurized with compressed air at the other end, so that an air cushion can form between the outer surface of the turning bar body when the turning bar body is at least partially wrapped around by the substrate web to be deflected in order to deflect a substrate web, such as a paper web or film web.

[0003] However, turning bar bodies with a material made at least partially of a porous material such as porous ceramic are also known from the prior art, so that the supplied compressed air escapes through the pores on the outer surface and thus an air cushion can be created between the outer surface of the turning bar body and the substrate web at least partially wrapping around the turning bar body.

[0004] Turning bars are used primarily for guiding and deflecting substrate webs and are usually arranged at an angle of 45° to the web travel direction. The substrate web to be deflected wraps around the turning bar body by essentially 180°, with the web travel direction of the substrate web being deflected by essentially 90°.

[0005] Due to the ever increasing web widths and the multitude of different materials and processing methods, certain substrates may, on the one hand, be substrate-related and, on the other hand, be subject to the deflection of the turning bar due to the web tension, leading to wrinkling and / or a lateral path of the substrate web directly in the area of ​​the turning bar or downstream of it.

[0006] Such issues are also known in the same or in a modified form from rotatably mounted web guide rollers, but due to the generally central web guidance over such a web guide roller, this can be corrected by a non-cylindrical shape of the outer surface, such as a concave or convex outer surface.

[0007] Due to the fact that a substrate web is not always guided centrally over a turning bar, particularly in complex turning units with a large number of turning bars, a design of a turning bar with a turning bar body with a non-cylindrical cross-section is disadvantageous, since depending on the position of the substrate web on the turning bar, a different behavior of the substrate web always results.

[0008] It is therefore the object of the invention to provide a solution with which the web guiding behavior of a substrate web can be influenced when wrapping around a turning bar.

[0009] The object is achieved according to the invention in that the turning bar comprises at least one bracing device, wherein the bracing device is designed such that the turning bar body can be brought into a straight or a curved shape as seen in the extension of its center line.

[0010] Such a turner bar has the advantage that it can react quickly to substrate-related changes in the web running behavior without having to retool the system, and that, particularly with large web widths and thus with large turner bar lengths, the turner bar body can be designed to be correspondingly slim and thus space-saving and cost-efficient, since increasingly larger diameters of the turner bar body are no longer required to achieve sufficient flexural rigidity.

[0011] According to one embodiment of the invention, the turning bar body can be brought into a variable curved shape along its center line.

[0012] This design has the advantage that the web guiding properties of the turning bar can be adapted specifically to the corresponding requirements such as material properties, web tension, tendency to crease formation.

[0013] According to one embodiment of the invention, the bracing device comprises at least one adjusting device and at least one holder.

[0014] Such a design has the advantage that a force and / or a bending moment can be introduced into the roller body, whereby the turning bar body can be brought into the desired shape along its center line using cost-effective and precisely adjustable means.

[0015] According to a further embodiment of the invention, at least one holder is attached to a turning bar body off-center and thus spaced from the center line.

[0016] Such a design has the advantage that a force introduced by an adjusting device is directly converted into an introduced bending moment for the desired deformation of the roller body in the extension of its center line, which enables a very space-saving design of the bracing device and, in addition, the holding devices for fastening the turning bar, for example to side walls, do not have to absorb any additional forces.

[0017] According to a further embodiment of the invention, the clamping device is arranged on the outside of the turning bar body.

[0018] Such a design has the advantage that, due to the fact that a turning bar is wrapped by the substrate web by a maximum of 180°, on the one hand the size of the clamping device is not unnecessarily limited and, on the other hand, good accessibility to the clamping device for adjustment and maintenance purposes is ensured.

[0019] According to a further embodiment of the invention, the turning bar body is tubular and the clamping device is arranged on an inner side of the turning bar body.

[0020] Such a design has the advantage that there is no interfering contour on the outside of the roller body, so that such a turning bar can be used at any point in a turning bar structure, regardless of the orientation, and can be wrapped in any shape.

[0021] According to a further embodiment of the invention, the at least one holder is fastened to a component different from the turning bar, such as, for example, to a side wall of a turning bar section, wherein the adjusting device is in operative connection with the turning bar body, for example, the adjusting device can transmit a tensile force or compressive force to the turning bar body.

[0022] Such a design has the advantage that it can be implemented very easily in the case of retrofitting, since only minor modifications to the turning bar body itself are required to introduce a tensile force and / or a compressive force.

[0023] According to a further embodiment of the invention, the adjusting device is designed as a threaded spindle or as a threaded bolt or as a hydraulic cylinder or as an electromechanically actuated linear drive or as an electrically actuated lifting spindle.

[0024] Such a design has the advantage that, on the one hand, very cost-effective components can be used, such as a threaded spindle or a threaded bolt. On the other hand, components such as a hydraulic cylinder, an electromechanically actuated linear drive, or an electrically actuated lifting spindle or an electrically driven threaded spindle have the advantage of being remotely controllable, allowing the straightness or curvature of the turning bar to be adjusted from any location.

[0025] According to a further embodiment of the invention, the clamping device is designed as a heating element and / or as a cooling element such as a Peltier element.

[0026] Such a design has the advantages that it allows for a very small overall size, that no forces need to be introduced into the turning bar or the turning bar body, since the linearity or curvature of the turning bar is influenced by a one-sided temperature change of the roller body, and that such a solution can be implemented with little effort in the case of retrofitting.

[0027] According to a further embodiment of the invention, the turning bar body has at least partially a reduced cross-section to ensure a defined curvature in the extension of the center line.

[0028] Such a design has the advantage of reducing the force or temperature difference required to deform the turning bar body. Furthermore, it can influence both the plane of the curvature change and the degree of curvature of the turning bar body along the centerline, since smaller material cross-sections allow for easier deformation.

[0029] Preferred developments of the invention will become apparent from the dependent claims and the following description. Various embodiments of the invention are explained in more detail, without being limited thereto, with reference to the drawings. Herein: Fig. 1 The operating principle of a turning bar Fig. 2 an exemplary turning bar with a mechanical clamping device Fig. 3 a cross-section through an exemplary turning bar with a mechanical clamping device Fig. 4 a cross-section through an exemplary turning bar with a thermally acting clamping device Fig. 5 a cross-section through an exemplary turning bar with a plurality of thermally acting clamping devices Fig. 6 a turning bar with a clamping device held outside the turning bar Fig. 7 a cross-section through an exemplary turning bar with a partially reduced cross-section

[0030] Fig. 1 shows the operating principle of a turning bar 1, of which only the turning bar body 2 and the center line 3 are shown.

[0031] The turning bar 1 is arranged at an angle of 45° to the first web travel direction LR1 of the incoming substrate web 10. The substrate web 10 wraps around the turning bar body 2 of the turning bar 1 by 180° and is deflected by 90° in a plane parallel to the plane of the incoming substrate web 10, so that the second web travel direction LR2 of the outgoing substrate web 10 is at a right angle to the first web travel direction LR1 of the incoming substrate web 10.

[0032] Since the turning bar body 2 has a straight cylindrical shape, the center line 3 of the turning bar 1 or the turning bar body 2 is a straight line.

[0033] As with the Fig. 1, the problem can also arise with turning bars 1 that various substrate webs, depending for example on the material and / or subject and / or previous processing steps, tend to form wrinkles, which can cause problems during the further processing and finishing of the substrate web 10.

[0034] In many cases, this can be remedied if, for example, the originally straight turning bar body 2 is slightly curved so that essentially a concave or convex effective surface of the turning bar body 2 is created, which is wrapped around by the substrate web 10.

[0035] In Fig. 1 shows two examples of such a curved center line 3 in a very exaggerated manner.

[0036] The inwardly curved center line 3a creates an effective concave surface when the substrate web 10 wraps around the turning bar body 2, whereas the outwardly curved center line 3b creates an effective convex surface of the turning bar body 2 when the substrate web 10 wraps around the turning bar body 2.

[0037] By creating a curved center line 3 and thus a curved turning bar body 2 in this way, the path guidance of the substrate web 10 and the tendency for the substrate web 10 to fold can be improved if necessary, whereby normally only deflections of the center line 3 of a few tenths of a millimeter are sufficient.

[0038] Conversely, however, it is also possible that due to a very high web tension in the substrate web 10, a resulting force bends the turning bar body 2, which is particularly possible with very large web widths of the substrate web 10, so that - although in an extremely exaggerated representation - the center line 3 of the roller body 2 has an inwardly curved shape like the center line 3a shown as an example, which can also lead to problems in the web guidance such as a lateral running of the substrate web 10 or wrinkling in the substrate web 10, so that it may be necessary to bend the turning bar body 2 and thus the center line 3a against the force resulting from the web tension back into a straight shape like the one shown in Fig. 1 shown center line 3.

[0039] Fig. 2 shows an exemplary shape of such a turning bar 1, with which the curvature of the turning bar body 2 and thus of the center line 3 can be changed or a straight shape of the turning bar body 2 and thus of the center line 3 can be ensured.

[0040] The exemplary in Fig. 2, which serves to guide and / or deflect a substrate web 10 which at least partially wraps around the turning bar 1 or the turning bar body 2, comprises a substantially cylindrical and / or tubular turning bar body 2 with a center line 3. In addition, the turning bar 1 comprises at least one holding device 4 for fastening the turning bar 1 to a Fig. 2 not shown side wall 12 or a likewise in Fig. 2 not shown frame. In the case of Fig. In the example shown in Figure 2, the turning bar 1 comprises two holding devices 4, namely lugs provided with a through-hole or an elongated hole, which are screwed into the turning bar body 2. Although not shown in Fig. 2, the holding device 4 can, in the simplest case, be designed, for example, as an internal thread or as an external thread or as a bore with which the turning bar body 2 can be fastened to another component, such as, for example, to a side wall 12.

[0041] In addition, the Fig. 2 exemplary turning bar 1 has two blowing air connections 8, through which a pressurized blowing air is supplied to the turning bar body 2, which exits through the outlet holes 9 and thus creates an air cushion between the outer surface of the turning bar body 2 and the Fig. 2 not shown substrate web 10 is generated.

[0042] In addition, the Fig. 2, the turning bar 1 has a clamping device 5. This clamping device 5 is designed in such a way that the turning bar body 2 can be brought into a straight or a curved shape as seen in the extension of its center line 3.

[0043] In this case, the turning bar body 2 can preferably be brought into a variable curved shape in the extension of its center line 3, which means that the curvature of the turning bar body 2 can be continuously curved in the extension of its center line 3 and / or that the curvature in the extension of the center line 3 has a variable curvature and thus a variable and thus non-constant curvature along its center line 3.

[0044] In the Fig. In the example shown in Figure 2, the clamping device 5 comprises an adjusting device 6 and two holders 7, although different designs with a plurality of adjusting devices 6 and / or only one holder 7 are also possible.

[0045] In the Fig. 3, the clamping device 5 comprises an adjusting device 6, wherein the adjusting device 6 is designed as a threaded spindle with corresponding nuts 11. Such a threaded spindle can either have a continuous thread or, as exemplified in Fig. 2, be designed as a threaded bolt with threads at both ends.

[0046] Although in the Fig. 2 and Fig. 3 shows an example in which the holders 7 are designed as separate components and can be fastened to the turning bar body 2 in a form-fitting and / or force-fitting manner, it is also possible for at least one holder 7 to be an integral part of a turning bar body 2, for example in that the turning bar body 2 has a tab which can be used as a holder 7 at at least one end.

[0047] As in Fig. 3, the two holders 7 are fastened to the turning bar body 2 by means of a plurality of screws. The holders 7 are fastened to the turning bar body 2 off-center and thus spaced from the center line 3. As a result, the adjustment device 6, that is, by tightening the screws in the Fig. 3 and Fig. 4, the resulting force exerts a bending moment on the turning bar body 2, so that the turning bar body 2 is either curved along its center line 3 or is brought into a straight line.

[0048] Although not in the Fig. 2 and Fig. 3, it is also possible for nuts 11 to be mounted on both sides of the adjusting device 6, which is designed as a threaded spindle, inside and outside the two holders 7. This makes it possible for the adjusting device 6 to not only generate a tensile force, but also for a compressive force to be generated by the two internal nuts 11, so that in such a case, the curvature of the roller body 2 can be changed in both directions as needed using simple and cost-effective means.

[0049] Although not in the Fig. 2 and Fig. 3, it is also possible that at least one holder 7 is not as shown in the Fig. 2 and Fig. 3, is fastened to the turning bar body 2, but that at least one holder 7 is fastened to a holding device 4, wherein fastened in this context means that a force and / or a bending moment can be generated on and thus by this at least one holder 7.

[0050] For example, it would be possible that the Fig. 2 and Fig. 3, the holding devices 4 shown have projections which can be used as holders 7 and in which the adjusting device 6 can be fastened, so that the tensile force or compressive force generated by the adjusting device 6 can introduce a bending moment via the holding devices 4 into the turning bar body 2 in order to change the curvature or to produce the straightness.

[0051] In the Fig. 2 and Fig. In the examples shown in Figure 3, the clamping device 5 is arranged on an outer side of the turning bar body 2, so that good accessibility to the adjusting device 6 designed as a threaded spindle is ensured for the purpose of adjustment. In addition, a Fig. 2 and Fig. 3, arranged on the outside of the turning bar body 2, enables simple retrofitting of existing turning bars 1.

[0052] Although not in the Fig. 2 and Fig. 3, it is possible, in particular if the turning bar body 2 is tubular and thus designed as a tube, that the clamping device 5 is then arranged on the inside of the turning bar body 2.

[0053] Although this limits the size and accessibility to the clamping device 5, particularly in the case of mechanically acting clamping devices 5, such a design offers the advantage that the turning bar body 2 can be wrapped by a substrate web 10 over its entire surface, which increases the possible uses of such turning bars 1, since it is not necessary to pay attention to the correct position of the clamping device 5 on the turning bar 1.

[0054] Such mechanically acting bracing devices 5 can, for example, be designed as shown in the Fig. 2 and Fig. 3 shown threaded spindle or as a threaded bolt. Although not in the Fig. 2 or Fig. 3, it is also possible for a clamping device 5 to be designed as a hydraulic cylinder or as an electromechanically operated linear drive or as an electrically operated lifting spindle.

[0055] Fig. 4 shows a sectional view through a schematically illustrated turning bar 1, which comprises a turning bar body 2 running along a center line 3 and two holding devices 4, with which the turning bar 1 can be fastened to receptacles not shown, for example attached to side walls.

[0056] In addition, the Fig. 4 schematically shown turning bar 1 a clamping device 5 attached only to one side of the inside of the tubular turning bar body 2. In the Fig. In the turning bar 1 schematically illustrated in Figure 4, the clamping device 5 is not designed as a mechanically acting clamping device, but rather as a heating element and / or a cooling element, as is possible, for example, with a Peltier element. However, components that essentially act as electrical resistors, which heat up when electrical voltage is applied, can also be used as the heating element.

[0057] Due to the one-sided arrangement of the clamping device 5, which is designed, for example, as a heating element and / or cooling element, the turning bar body 2 is heated or cooled on one side, which leads to an expansion or shortening of the corresponding point, which is why the curvature of the turning bar body 2 in the extension of the center line 3 can thus be changed or the straightness in the extension of the center line 3 can be restored.

[0058] Thus, by changing the temperature difference between a non-heated or non-cooled area and a heated or cooled area, the strength of the curvature and thus the radius of curvature can be changed, and with the locally limited heating or cooling of the turning bar body 2, the direction of the curvature can be changed, so that all variants can be influenced with this design.

[0059] Fig. 5 shows an embodiment of the Fig. 4 illustrated embodiment of a turning bar 1. In contrast to the Fig. 4 includes the version shown in Fig. 5, the turning bar 1 shown has a plurality of heating and / or cooling elements that are spatially and thermally separated from one another, namely a first heating and / or cooling element 5-1 on a first region of the inside of the turning bar body 2, and a second heating and / or cooling element 5-2 on a second region of the inside of the turning bar body 2, wherein the second region is preferably arranged offset by 180° to the first region.

[0060] While, for example, the first clamping device 5-1 increases the temperature of the turning bar body 2 in the first region so that it expands in this region, the second clamping device 5-2 can, for example, reduce the temperature of the turning bar body 2 in the second region so that it contracts in this region.

[0061] By simultaneously heating and cooling the temperature of the turning bar body 2 in two different areas, which are preferably arranged offset by 180° to one another, it is avoided that over time the temperature introduced by only one clamping device 5 spreads over the entire turning bar body 2 and thus no or only a minimal change in the curvature of the turning bar body 2 in the extension of the center line 3 can be effected.

[0062] Although not in Fig. 4 or Fig. 5, it is also possible to use at least one clamping device 5 designed as a heating element and / or cooling element not as shown in Fig. 4 or Fig. 5, on the inside of the tubular turning bar body 2, but such a bracing device 5 can also be arranged on the outside of the turning bar body 2, which facilitates accessibility, the necessary wiring and the ability to attach, which is why such a design is preferably used for retrofitting.

[0063] In particular when using heating and / or cooling elements as a bracing device 5, it is particularly useful for dissipating the waste heat generated by a Peltier element if the turning bar body 2 has at least one outlet bore 9 for blown air on at least part of its lateral surface, so that the heated or cooled air can be removed from the interior of the turning bar body 2 in order to avoid heating or cooling of the entire turning bar body 2, since in this case the curvature of the turning bar body 2 could no longer be changed in a controllable manner.

[0064] Fig. 6 shows a schematic representation of a turning bar 1 arranged between a first side wall 12-1 and a second side wall 12-2 of a turning bar unit, wherein the turning bar 1 comprises a turning bar body 2 with a center line 3 and, for example, two holding devices 4 with which the turning bar 1 is fixed to the two side walls 12.

[0065] At the Fig. 6, the clamping device 5 comprises, for example, an adjusting device 6, which can be designed, for example, as a hydraulic cylinder or as an electromechanically actuated lifting spindle, wherein the adjusting device 6 is connected to the second side wall 12-2 via a first holder 7-1 and is connected to the turning bar body 2 via a second holder 7-2, wherein the second holder 7-2 is designed, for example, as a screw connection.

[0066] Consequently, Fig. 6 an embodiment in which at least one holder 7, in the present example the Fig. 6, this is the first holder 7-1, which is fastened to a component other than the turning bar 1, wherein the clamping device 5 or the adjusting device 6 is in operative connection with the turning bar body 2.

[0067] Although it is fundamentally possible for the clamping device 5 or the adjusting device 6 to be connected only to the first holder 7-1 for support and to still apply a compressive force to the turning bar body 2 without a second holder 7-2 and thereby bend it in the extension of its center line 3, it is possible due to the connection of the adjusting device 6 to the turning bar body 2 by means of the second holder 7-2 to alternatively apply a tensile force to the turning bar body 2 in addition to a compressive force, so that the orientation of the curvature is variable and / or depending on the deflection of the turning bar body 2 by the web tension of the Fig. 6 not shown substrate web 10, the straightness of the turning bar body 2 can be restored.

[0068] Fig. Fig. 7 shows a cross section through an exemplary turning bar 1 comprising two holding devices 4 and a turning bar body 2 with a center line 3, wherein the turning bar body 2 has at least partially a reduced cross section to ensure a defined curvature when exposed to a force generated by a force in Fig. 7 has a bracing device 5 not shown.

[0069] In the Fig. In the example shown in Figure 7, the turning bar body 2 has a plurality of recesses 13 on its inner side, so that in the areas of the recesses 13 the roller body 2 has a smaller cross-section and thus a lower bending resistance moment than the remaining areas of the turning bar body 2, whereby the type and shape of the deflection of the turning bar body 2 can be influenced accordingly when a bending moment is applied.

[0070] Although Fig. 7 shows an example of partially reduced cross sections by means of recesses 13 on the inside of the turning bar body 2, which offers the advantage that the entire outer surface of the turning bar body 2 is covered by a Fig. 7, it is also possible for such locations for reducing the cross-section to be provided on the outside of the turning bar body 2, although this is then only possible in the areas of the outer surface of the turning bar body 2 which do not have to be wrapped by a substrate web 10 during operation.

[0071] With the above-mentioned exemplary embodiments of such a turning bar 1, it is thus possible to operate a printing press in such a way that, depending on a substrate guidance quality, that is the tendency of a substrate web 10 to run sideways, to form wrinkles or similar problems which can occur after being deflected by a turning bar 1, the clamping device 5 is controlled or activated in a web running direction LR upstream and / or downstream of the at least one turning bar 1 in such a way that the turning bar body 2 is brought into either a straight or a more or less strongly curved shape as seen in the extension of its center line 3.

[0072] Monitoring the web running behavior of the substrate web 10 is possible, for example, using sensors. For example, wrinkles in the substrate web 10 can be detected using camera-based sensors. It is also possible, although in Fig.1 does not show that the lateral course of the edges of the substrate web 10 is detected by means of corresponding sensors, so that on the basis of the signals generated thereby, the required or maximum permissible deflection of a turning bar 1 is calculated by means of a computing device and the at least one tensioning device 5 is activated or controlled accordingly via a control loop. For this purpose, the turning bar body 2 of a corresponding turning bar 1 is then brought into a curved shape in stages or variably as seen along its center line 3. However, it is also possible for the turning bar body 2 to be returned to its originally intended rectilinear shape by such a method, provided that the web tension of the substrate web 10 causes an undesired deflection of the turning bar body 2.

[0073] In addition to the maximum deflection, i.e. the deflection of the center line 3 compared to a straight line, the direction of the deflection can also be adjusted accordingly. List of reference symbols 1 turning bar 2 turning bar bodies 3 Center line 4 Holding device 5 Bracing device 6 Adjustment device 7 holders 8 Blow air connection 9 exit holes 10 substrate web 11 Mother 12 side wall 13 Turn LR running direction

Claims

[1] Turning bar (1) for guiding and / or deflecting a substrate web (10) at least partially wrapping around the turning bar (1), wherein the turning bar (1) has at least one substantially cylindrical and / or tubular turning bar body (2) with a center line (3) and at least one holding device (4) for fastening the turning bar (1) to a side wall (12) or a frame, characterized by in that the turning bar (1) comprises at least one bracing device (5), wherein the bracing device (5) is designed such that the turning bar body (2) can be brought into a straight or a curved shape as seen in the extension of its center line (3). [2] Turning bar (1) according to claim 1, characterized by that the turning bar body (2) can be brought into a variable curved shape along its center line (3). [3] Turning bar (1) according to one of claims 1 or 2, characterized bythat the bracing device (5) comprises at least one adjusting device (6) and at least one holder (7). [4] Turning bar (1) according to claim 3, characterized by that at least one holder (7) is fastened to the turning bar body (2) off-center and thus at a distance from the center line (3). [5] Turning bar (1) according to one of claims 3 or 4, characterized by that at least two holders (7) are fastened to the turning bar body (2) off-center and thus spaced from the center line (3). [6] Turning bar (1) according to one of claims 3 or 4, characterized by that at least one holder (7) is attached to a holding device (4). [7] Turning bar (1) according to one of claims 1 to 6, characterized by that the clamping device (5) is arranged on an outer side of the turning bar body (2). [8] Turning bar (1) according to one of claims 1 to 6, characterized bythat the turning bar body (2) is tubular and that the clamping device (5) is arranged on an inner side of the turning bar body (2). [9] Turning bar (1) according to claim 3, characterized by that the at least one holder (7) is fastened to a component different from the turning bar (1) and the adjusting device (6) is in operative connection with the turning bar body (2). [10] Turning bar (1) according to one of claims 3 to 9, characterized by that the adjusting device (6) is designed as a threaded spindle or as a threaded bolt or as a hydraulic cylinder or as an electromechanically operated linear drive or as an electrically operated lifting spindle. [11] Turning bar (1) according to claim 1, characterized by that the bracing device (5) is designed as a heating and / or a cooling element. [12] Turning bar (1) according to claim 11, characterized bythat the clamping device (5) is arranged on an outer side of the turning bar body (2) and / or in the case of a tubular turning bar body (2) on an inner side of the turning bar body (2). [13] Turning bar (1) according to one of claims 1 to 12, characterized by that the turning bar body (2) has at least one outlet opening for blown air on at least part of its outer surface. [14] Turning bar (1) according to one of claims 1 to 13, characterized by that the turning bar body (2) has at least partially a reduced cross-section to ensure a defined curvature in the extension of the center line (3).

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