EP2817471A1

EP2817471A1 - Device for rolling up and unrolling a material web onto and from a shaft

Info

Publication number: EP2817471A1
Application number: EP13706431.7A
Authority: EP
Inventors: Peter Lang; Florian AULINGER
Original assignee: Shadesign & Co KG GmbH
Current assignee: Shadesign & Co KG GmbH
Priority date: 2012-02-24
Filing date: 2013-02-21
Publication date: 2014-12-31
Anticipated expiration: 2033-02-21
Also published as: EP2817471B8; US9447633B2; AU2013224382A1; EP2817471B1; RU2014138511A; JP2015508134A; DE102012003524A1; CN104136702B; CA2863560C; JP6162727B2; WO2013124067A1; CA2863560A1; CN104136702A; DE102012003524B4; AU2013224382B2; RU2603607C2; ES2574519T3; US20150034261A1

Abstract

The present invention discloses a device for rolling up and unrolling a material web (2) on a shaft (1, 15). The device is distinguished by the fact that a first radial spacing (R1) of the material web (2) from a rotational axis of the shaft (1, 15), which first radial spacing (R1) is assigned to any desired unrolled length (L) of the material web (2), differs from a second radial spacing (R2) of a tensioning cable (3, 16) from the rotational axis of the shaft (1, 15), which second radial spacing (R2) is assigned to said unrolled length (L), with the result that the direction and magnitude of a first torque which is exerted on the shaft (1, 15) via the material web (2) differ from those of a second torque which is exerted on the shaft (1, 15) via the tensioning cables (3, 16), in such a way that, on account of the torque difference between the first torque and the second torque, the shaft (1, 15) is driven by a force (F) which is transmitted by means of the tensioning cables (3, 16).

Description

Device for winding and unwinding a material web on and from a shaft

The present invention relates to a device for winding and unwinding of a material web on and from a shaft according to the preamble of claim 1. Corresponding devices can serve as a shading device, visual protection device and / or delimiting device.

In known from the prior art devices for winding and unwinding of a material web on and from a shaft, the material web is usually attached to a first attachment end to a support structure, for example to a window beam or to a wall. At a second attachment end opposite the first attachment end, the material web is fastened to a circumference of the shaft in such a way that the material web moves on a central portion of the shaft as a function of the direction of rotation of the shaft by rotation about a rotation and symmetry axis Wave is rolled up and down. For guiding or for tensioning the shaft, the latter has at its two axial end regions in each case an edge section, wherein a respective tensioning cable is fastened to the respective enclosing of the edge sections. The tension cables can be rolled up and down by rotating the shaft as a function of the direction of rotation on the respective edge sections. The attachment of the material web on the circumference of the central portion of the shaft and the attachment of the tensioning cables to the embracing of the edge portions of the shaft are such that by rotating the shaft in a Abrolldrehrichtung the shaft moves away from the support structure and thereby the material web from the central portion unwinding the shaft, wherein in this Abrolldrehung the shaft, the tension cables are rolled up on the respective edge portions of the shaft. On the other hand, when the shaft is rotated in a roll-up direction opposite to the rolling-down direction, the shaft moves toward the support structure, and the web is rolled up on the central portion of the shaft, rolling the tensioning cables from the respective edge portions of the shaft during this rolling-up rotation of the shaft.

In an arrangement in which the web is to roll in the vertical direction of the shaft, the shaft is driven by the force acting on them gravity and rotated, causing the web to roll off the shaft. On the other hand, as soon as the device is mounted in such a way that the material web is intended to roll out obliquely or even horizontally, the shaft is only insufficiently driven by the gravitational force acting on it, so that the shaft has to be turned manually or by a motor. During the rolling movement of the shaft, in which the surface material rolls off the shaft, the radial distance between the surface material and the axis of rotation decreases with increasing rolling length. If the radial distance between the tensioning cables and the axis of rotation remained constant during the rolling movement of the shaft, the tension of the surface material would depend on the coasting length. In order that the material web always remains uniformly tensioned by the shaft independently of its coasting length, the edge regions of the shaft have such a conical shape that, regardless of the rolling length of the surface material, the radial distance between the tensioning cables and the axis of rotation is always identical to the radial distance of the surface material from the axis of rotation , In a corresponding device known from the prior art, the shaft must be driven, for example, either manually or by a motor via a separate traction cable which is rotatably connected, for example, to an end face of the shaft in the region of its axis of rotation.

The devices known from the prior art thus have many components, so that they have a satisfactory functionality. Consequently, such devices are expensive to manufacture and expensive to install. Furthermore, these devices due to the large number of components on an increased error rate. For example, DE 681428 describes an engine for the rolling and winding device on roller blinds for window fronts in darkening devices, wherein the roller blind above the window in a terminal block attached and wound on a serving as a drop rod roll bar. The roll bar is by a on him in a roller winding up and held at the top of the window run and a roller mounted on the roll bar and this by means of a winch roller winding up and unrolled.

The object of the present invention is to provide an improved device for winding and unwinding a material web onto and from a shaft which comprises fewer components, is easier to install, ensures sufficient tension of the material web independently of its coasting length and in particular in the case of an arrangement in which the material web is unrolled obliquely or horizontally from the shaft, the shaft is further reliably driven.

This object is achieved by a device having the features of claim 1 for winding and unwinding a web of material on and from a shaft. Advantageous embodiments are described in the subclaims.

More specifically, in the apparatus according to the invention, a first radial distance of the material web assigned to an arbitrary length of travel of the material web differs from the rotational axis of a second radial distance of the tensioning cable to the axis of rotation associated with this run-out length. This ensures that even with a horizontal attachment of the device in which the material web in a rolled state should have a substantially horizontal orientation, the material web reliably from the central portion of the shaft or wound off when a force on the tension cables on the wave is exercised.

A force transmitted to the shaft via the tensioning cables acts on the points of the edge sections at which the tensioning cables detach tangentially from the corresponding edge sections of the shaft. Since the tensioning cables are connected to the material web via the shaft, this force is exerted on the support structure which, according to the third Newton's law (force = counterforce), applies a counterforce. This counterforce acts on the contact point of the material web with the central portion of the shaft and acts according to the Newtonian reaction principle in the opposite direction as the üvertragene means of the tension cables force. Due to the different radial distance of the material web to the axis of rotation and the distance of the tensioning cables to the axis of rotation, a first torque exerted on the shaft via the material web differs from a second torque exerted via the tensioning cables. The first torque and the second torque are opposite in direction but have different absolute magnitudes because the first distance differs from the second distance. Consequently, a difference torque results, by means of which the shaft is driven.

The torque difference corresponds to the product of the applied force with the difference of the first radial distance and the second radial distance. This attacks in other words at the contact point of the material web with the circumference of the central portion of the shaft and causes rotation of the shaft.

In the device according to the invention, the clamping Ropes on the one hand for tensioning the material web and for guiding the shaft and also serve to drive the shaft, thus for rolling or rolling the material web on or from the central portion of the shaft. The device according to the invention comprises only three essential components, namely the material web, the shaft on which the material web is wound up or from which the material web is unwound, and two tensioning cables which can be rolled up and unrolled on the edge regions of the shaft. The device according to the invention therefore has only a few components, so that their manufacture and their installation is particularly simple. Due to the small number of components beyond the error rate of the device according to the invention is reduced.

Preferably, the tensioning cables are designed to be elastic and, in a tensioned state, exert a force directed away from the retaining structure on the shaft, so that the shaft is driven by means of the force exerted by the tensioning cables. A corresponding design has the advantage that no separate Kraftausübeeinrichtung such as an electric motor or the like must be used so that the shaft is driven. Preferably, the device comprises an energy storage device operatively connected to the tensioning cables and exerting on the tensioning cables a force directed away from the support structure. As a result, the shaft can be driven by means of the force exerted by the force storage device. The power storage device may for example consist of a tension spring or two tension springs or a plurality of tension springs. Preferably, the first distance of the material web to the axis of rotation associated with any run-out length of the material web is greater than the second distance of the tensioning cable associated with the coasting length to the axis of rotation. An appropriate design ensures that the first torque exerted on the shaft via the material web is greater than the second torque exerted on the shaft via the tension cables. The shaft is driven away from the support structure due to the torque difference between the first torque and the second torque by the force transmitted by the tension cables. In other words, at the contact point of the material web on the circumference of the central portion of the shaft, the torque difference between the first torque and the second torque acts, so that the shaft is driven in such a way that it moves away from the holding structure due to this torque difference emotional .

Consequently, in a corresponding embodiment of the device, the material web is always unrolled from the central portion of the shaft when the shaft is not fixed in position, which can be done for example by a fixing device. On the other hand, the first distance of the material web to the axis of rotation associated with any length of roll-out of the material web may preferably be smaller than the second distance of the tensioning cable to the axis of rotation associated with this coasting length. As a result, the first torque exerted on the shaft via the material web is smaller than the second torque exerted on the shaft via the tension cables, so that the shaft due to the torque difference between the first torque and the second torque is driven by the force transmitted by the tension cables to the support structure to. In other words, the torque difference between the first torque and the second torque at the point of contact of the tensioning cables acts on the circumference of the edge portions and causes a rotation of the shaft on the support structure. This ensures that the material web is always completely rolled up by a force, more specifically a tensile force on the tension cables on the shaft when the shaft is not fixed in position, which can be done for example by a fixing device.

Preferably, the edge portions of the shaft are cylindrical. A corresponding embodiment is particularly simple and inexpensive.

Preferably, the two edge portions of the shaft are at least partially conical along their respective axial extent, and thus taper along their respective axial extent from a first diameter to a second diameter. In this case, the first, larger diameter adjacent to the central portion of the shaft, but may also be the other, the second, smaller diameter adjacent to the central portion of the shaft.

Due to a corresponding configuration of the edge regions of the shaft, a tension of the material web can be maintained during the roll-up and roll-off movement of the shaft and a corresponding unwinding or unwinding of the material web since the diameter of the material changing with the roll-off length of the material web Material web due to the changing diameter of the Tensioning cables on the edge portions of the shaft is compensated.

Preferably, upon rotation of the shaft in the unwinding direction, in which the material web rolls off from the central portion of the shaft, the respective tensioning cables are rolled up on the respective edge sections of the shaft in the direction of the tapering of the edge sections. This ensures that the tension of the material web remains sufficiently maintained, because when the material web rolls off the central portion of the shaft, the first radial distance of the material web from the rotational axis decreases with increasing length of the material web, so that this becomes smaller radial first Distance is compensated by the fact that the respective tensioning cables are rolled up during their rolling movement in the direction of the taper of the edge portion.

With increasing Ausrolllänge the web either shorten the tension cables that exert a tensile force, and / or the power storage device, for example in the form of a tension spring shortens. Due to this shortening, the tensioning cables and / or the energy storage device exert a small force in accordance with Hooke's law. To compensate for this decreasing force during the rolling of the web, the difference between the first distance of the web to the axis of rotation and the second distance of the tensioning cable to the axis of rotation increases with increasing, ie increasing Ausrolllänge the web. This ensures that the torque difference between the first torque and the second torque over the entire Ausrolllänge the material web substantially remains constant, so that the shaft is driven at a constant torque and thus the web is unrolled at a constant unwinding speed of the shaft.

Preferably, on the other hand, upon rotation of the shaft in rolling-up direction ng, in which the material web is rolled up on the central portion of the shaft, the respective tensioning cables are unrolled from the respective edge portions of the shaft in the direction of thickening of the edge portions.

Preferably, the difference between the second distance of the tensioning cable to the axis of rotation and the first distance of the material web to the rotational axis decreases, so that the torque difference over the entire Ausrolllänge the material web remains substantially constant.

With shrinking Ausrolllänge the web, namely shorten either the tension cables and / or the power storage device, so that they have a smaller

Exercise power. This force reduction is compensated by the increasing difference between the second distance and the first distance, so that the shaft is driven by means of the applied force at an approximately constant speed in the direction of the holding structure.

The device preferably has a clamping device that is actively connected to the tensioning cables and / or the force-storing device for tensioning the tensioning points and / or the force-storing device. This offers the advantage that depending on the angular orientation of the rolled-up material web and depending on the accordingly necessary forces for rolling or curling the web, a suitably adapted bias can be applied. A corresponding clamping device can be realized, for example, in the form of a turnbuckle.

Preferably, the device further comprises a control element that is rotatably connected to a shaft end face of the shaft in the region of the axis of rotation and that can be configured, for example, as an operating cable or as an operating lever or as an operating chain. By means of the control element, the shaft can be acted upon manually and / or motor with a force. When the power storage device and / or the tensioning cables are largely relaxed, the shaft can be displaced again by means of the operating element against the force exerted by the tensioning cables and / or by the force storage device into an initial position, so that the tensioning cables and / or the power storage device again be tense.

In a further preferred embodiment, the device further comprises a supplementary shaft at the periphery of the first attachment end of the material web is fixed such that by rotating the additional shaft about an axis of rotation, the material web on a central portion of the additional shaft up and is unrolled. The additional shaft has in its two axial end regions in each case an edge portion, on each of which an additional tensioning cable is fastened, wherein the additional tensioning cables can be wound up and down on the respective edge portions by rotation of the auxiliary shaft and can be fastened to the support structure. By turning the auxiliary shaft in a Abrolldrehrichtung through which the additional shaft to the support structure to moved, the web is unrolled from the central portion of the additional shaft and the additional tension cables are rolled up on the respective edge portions of the additional shaft. By rotating the auxiliary shaft in a Aufrolldrehrichtung through which the additional shaft moves away from the support structure, the material web is rolled up on the central portion of the additional shaft and the tension cables are unrolled from the respective edge portions of the shaft. A first radial distance of the material web to the axis of rotation of the additional shaft assigned to any length of roll-out of the material web differs from a second radial distance of the additional tensioning cable assigned to this rolling-out length to the axis of rotation of the central shaft, so that a first torque exerted on the additional shaft via the material web differs from a second torque exerted on the additional shaft via the additional tensioning cables in the direction and size such that the additional shaft is driven due to the torque difference between the first torque and the second torque by a force transmitted by the additional tensioning cables.

By a corresponding device, for example, a shading surface or a privacy screen can be moved back and forth variably in space without the material web must be attached to the support structure and thus ends there. For example, a shading surface or screen may be created that appears to be out of contact with a mounting structure and thus appears to be three mounted in space.

Further advantages, details and features of the invention will become apparent from the illustrated exemplary embodiments. In detail: a section through a shaft with a rolled-up, flexible material web and with a shaft attached to the tensioning cable; a section through the shaft with a tensioning cable attached thereto; a front view and a plan view of the device according to the invention, in which the material web is rolled up on the shaft; a front view and a plan view of the device according to the invention, in which the material web is unrolled from the shaft; a section through a part of the central portion of the shaft and through an end portion of the shaft, wherein the material web is wound on the central portion and the tensioning cable is unrolled from the edge portion; the device shown in Figure 5, wherein the web of material from the central portion and the tensioning cable is rolled up on the edge portion; a section through an end region of the central portion of the shaft and through an edge portion of the shaft, the guide having grooves for the tensioning cable; a schematic side view of the device according to the invention, in which a first radial distance of the material web to the axis of rotation is greater than a second radial distance of the tensioning cable to the axis of rotation; a diagram showing the dependencies of the first radial distance and the second radial distance of the Ausrolllänge the material web; a schematic side view of the device according to the invention, in which the first radial distance of the material web to the axis of rotation is smaller than the second radial distance of the tensioning cable to the axis of rotation; a diagram illustrating the dependencies of the first radial distance and the second radial distance from the Ausrolllänge the material web; a side view of the device according to the invention with an attached to the shaft control element, wherein the material web has an oblique orientation;

FIG. 13 shows a front view and a top view of the device according to the invention a further embodiment comprising two shafts, on which the material web can be wound up, wherein the material web is unwound from the two shafts; and

FIG. 14 shows the device shown in FIG. 13, in which the material web is largely wound on the two shafts.

In the following description, like reference numerals designate like components and like features, so that a description made with respect to a figure with respect to a component also applies to the other figures, so that a repetitive description is avoided.

FIG. 1 shows a cross section through a shaft 1, on whose circumference a second attachment end of a material web 2 is fastened. The material web 2 is wound up on the shaft 1 and separates from the shaft at a tangential point on which the material web runs vertically upward in the orientation shown in FIG. As can be seen from Figure 2, a tensioning cable 3 is attached to the circumference of the shaft 1 by one end of the tensioning cable 3 protrudes through an opening in the circumference of the shaft 1 and knotted together inside the shaft to a node 6, so that a Spannseilfixierung 7 results. The tensioning cable 3 and the material web 2 are arranged such that upon unrolling of the material web 2 from the shaft 1, the tensioning cable 3 is rolled up on the shaft 1. On the other hand, in the illustration of FIGS. 1 and 2 the shaft 1 is rotated counterclockwise, the material web 2 is rolled up on the shaft 1, whereas the tensioning cable 3 is unrolled from the shaft 1. Figure 3 shows a schematic representation of the device according to the invention in a frontal view and in a plan view. The material web 2 has a first attachment end 5, on which the material web 2 is attached to a support structure 8. The support structure 8 may be, for example, a masonry or any other support structure. As already explained above with reference to FIG. 1, a second fastening end 4 is fastened to the circumference of the shaft 1. The material web 2 is completely rolled up in the illustration of Figure 3 on the shaft 1.

The shaft 1 has at its two axial end regions in each case an edge portion 10, which adjoin the central portion and at the respective surrounding each a tensioning cable 3 is attached. The tension cables 3 are up by rolling the shaft 1 on the edge portions 10 and unrolled. The other ends of the tensioning cables 3 are in turn fastened to a support structure 8 or to a tensioning device 9. In this case, the tension cables 3 have a certain tension, so that when the material web 2 is rolled up or unrolled from the shaft 1, the shaft 1 is guided in its movement. By rotating the shaft 1 in a Abrolldrehrichtung the shaft 1 moves away from the support structure 8. In this case, the material web 2 is unrolled from the central portion of the shaft 1, and at the same time the tensioning cables 3 are rolled up on the respective edge portions 10 of the shaft 1. FIG. 4 shows the device in which the material web 2 is partially unrolled from the central portion of the shaft 1. A rolling of the material web 2 of the central portion of the shaft 1 is thus accompanied by a rolling up of the tensioning cables 3 on the edge portions 10 of the shaft 1.

The device further comprises a rotatably connected to a shaft end face 13 of the shaft 1 in the region of the axis of rotation control element 11, which may be configured, for example, as a control cable 11, control lever 11 or operating chain 11. By means of the operating element 11, the shaft can be moved up and / or down, so that during a downward movement, the material web 2 from the central portion of the shaft 1 rolls, and at an upward movement of the shaft 1, the material web 2 on the central portion of Rolling up shaft 1.

FIG. 5 shows a section through a part of the central section and through an edge section 10 of the shaft 1 of the device in a state in which the material web 2 is largely rolled up on the shaft 1 and the tensioning cable 3 is largely unrolled from the edge section 10. This state corresponds to the state of the device shown in FIG. FIG. 6 shows the same region in cross-section as FIG. 5, wherein in FIG. 6 the material web 2 is for the most part unrolled from the shaft 1 and the tensioning cable 3 is largely rolled up on the edge section 10 of the shaft 1. This state corresponds to the state shown in FIG.

It can be seen from FIGS. 5 and 6 that the edge section 10 of the shaft 1 extends along its axial primary recesses. kung is tapered and tapers along its axial extent from a first diameter to a second diameter. This conical shape for the edge portion 10 has the purpose that the material web 2 always remains uniformly or approximately uniformly tensioned, regardless of a length L of rolling of the material web 2. Because during the unwinding of the material web 2, a first radial distance Rl of the material web 2 decreases to the axis of rotation of the shaft 1. This in the course of unrolling the material web 2 from the shaft 1 decreasing first radial distance Rl must be compensated by a second radial distance R2 of the tensioning cable 3 to the axis of rotation during the reeling of the tensioning cable 3 on the edge portion 10 noticeably reduced. As a result, when the material web 2 unrolls from the shaft 1, the same length of the material web 2 is unrolled as the length of the tensioning cable 3 is rolled up on the edge portions 10. Thus, the tensioning cable 3 is always applied at a curl on the edge portion 10 of the shaft 1 at the correct radius, the edge piece 10 may have guide grooves 14, so that the tensioning cable 3 is in a wound state on a reeling line 12.

Figure 8 shows a schematic side view of the device according to the invention in a state in which the material web 2 is already partially unrolled from the central portion of the shaft 1. The coasting length L of the material web, which represents the length of the unrolled material web 2 from the holding structure 8 to the contact point of the material web 2 with the shaft 1, is approximately 50% of the maximum coasting length L in the state shown in FIG. The tensioning cable 3 is partially rolled up in the state shown in Figure 8 on the circumference of the edge portion 10 of the shaft 1. The tensioning cable 3 is deflected by a deflection device 22 and is connected to a force storage device 21 in the form of a tension spring 21. The force storage device 21 itself in turn is connected to a holding structure 8.

The power storage device 21 exerts on the tension cables 3, a tensile force F. Due to the third Newton's law and the connection of the tensioning cable 3 with the material web 2 via the shaft 1, the support structure 8, with which the second attachment end 4 of the material web 2 is connected, exerts an opposing counterforce on the material web 2. The counteracting force exerted by the support structure 8 is identical in magnitude to the tensile force F exerted on the tensioning cables 3 by the force storage device 21, but oriented in the opposite direction. It can be seen from FIG. 8 that a first radial distance Rl of the material web 2 to the axis of rotation of the shaft 1 is greater than a second radial distance R2 of the tensioning cables 3 to the axis of rotation of the shaft 1. Consequently, an over the material web 2 onto the shaft 1 exerted first torque greater than a second torque exerted on the shaft 1 via the tensioning cables 3, because the first radial distance Rl is greater than the second radial distance R2, and the force acting on the circumference of the central portion of the shaft 1 is identical in magnitude the tensile force F, which acts on the circumference of the edge portion 10 of the shaft 1. Both torques are aligned with each other, so that a difference torque results. Since this on the material web 2 on the shaft 1 from The first torque applied is greater than the second torque exerted via the tension cables on the edge sections 10, and since the first torque causes the shaft to rotate counterclockwise in the illustration of FIG. 8, the differential torque also causes rotation of the shaft 1 counterclockwise in the illustration of Figure 8. Upon rotation of the shaft

1 counterclockwise rolls the web

2 from the central portion of the shaft 1, at the same time the tensioning cables 3 on the edge portion 10 of the shaft

1 rolled up.

In other words, the differential torque acts on the point of the shaft 1 at which the material web 2 leaves the shaft 1.

FIG. 8 the material web 2 is aligned horizontally in an unrolled state. This represents an idealized state. Usually, the shaft 1 sags a little, so that the angle enclosed by the material web 2 and the tensioning cables 3 is not 180 ° but includes a smaller angle. However, since the respective radial distances of the material web 2 to the axis of rotation or of the tensioning cable 3 to the axis of rotation do not change, the force ratios in a correspondingly sagging shaft 1 are identical to the force ratios described above.

If the material web 2 is not oriented horizontally in an unwound state but is oriented obliquely, then not only the force F generated by the force storage device 21 acts on the shaft 1, but in addition also a downhill force. component of gravity, which in addition to a rolling of the web 2 of the shaft 1 contributes.

In the device according to the invention is thus ensured that the unrolled material web 2 is tensioned by the tensioning cable 3 and beyond the tensioning cable 3, the shaft 1 drives.

During the rolling movement of the shaft 1, the force storage device 21 contracts, so that in the course of the rolling movement, the force exerted by the force storage device 21 becomes smaller as the length L of the material web 2 increases. Consequently, with a constant difference of the first radial distance Rl to the second radial distance R2, the shaft 1 would be pulled by the energy storage device 21 with increasing Auslauflänge L slower towards the end position of the shaft 1. However, so that the torque difference remains essentially constant over the entire coasting length L of the material web 2, the shape of the edge portions 10 can be adapted such that the difference between the first distance Rl of the material web 2 to the axis of rotation of the shaft 1 and the second Distance R2 of the tensioning cable 3 to the axis of rotation of the shaft 1 increases with increasing Ausrolllänge L of the web 2. A corresponding relationship is shown in FIG. 9, from which it can be seen that, as the length L of the material web 3 increases, the second radial distance R2 of the tensioning cable 3 drops more steeply to the axis of rotation than the first radial distance R1 of the material web 2 to the axis of rotation. As a result, as the coasting length L of the power storage device 21 increases, it becomes smaller expectant force F compensated by the fact that the difference between the first radial distance Rl and the second radial distance R2 is greater. The product of tensile force F and difference of the radial distances R2 and Rl thus remains approximately constant. This ensures that the shaft 1 is transferred at a constant or essentially constant speed over the entire coasting length L from an initial position to an end position.

While FIG. 8 shows a side view of the device according to the invention, in which the material web 2 is unrolled from the shaft 1 due to the exertion of force by the force storage device 21, FIG. 10 shows the device according to the invention in which the material web 2 is deformed due to the tensile force F exerted by the force storage device 21 is rolled up on the shaft 1. For this purpose, for any length L of the material web 2, the first distance Rl of the material web 2 to the axis of rotation must be smaller than the second radial distance R2 of the tensioning cable assigned to this length L to the rotation axis.

Consequently, the first torque exerted via the material web 2 via the shaft 1 is smaller than the second torque exerted on the shaft 1 via the tensioning cables 3. The scalar quantities of the first and second torques are shown symbolically with arrows of different sizes in FIG. The direction of the respective arrows indicates the direction in which the respective torques drive the shaft 1. Due to the effect of the differential torque, the shaft 1 in the illustration of FIG

1 is turned clockwise, at which the material web

2 is rolled up on the central portion of the shaft 1. In the embodiment shown in FIG. 10, the force storage device 21 is maximally tensioned when the material web 2 is completely unrolled from the shaft 1, ie when the shaft 1 is located on the rightmost in the illustration of FIG. When the force storage device 21 contracts and thus relaxes, the shaft 1 is moved in the direction of the second attachment end 4 of the material web 2 due to the resulting torque. Due to the contraction of the force storage device 21, as the length L of the material web 2 decreases, the force F exerted by the force storage device 21 is reduced. In order for the shaft 1 to be transferred from the force storage device 21 to its end position at a constant speed, the differential torque must however, be constant. In order to achieve this, as shown in FIG. 11, the difference between the second distance R2 of the tensioning cable 3 relative to the axis of rotation and the first distance R1 of the material web 2 to the axis of rotation may become smaller with increasing length L of the material web. Thereby, the torque difference over the entire Ausrolllänge L of the web 2 can be kept substantially constant, so that the rolling speed of the shaft 1 remains substantially constant.

FIG. 12 shows the device according to the invention in a schematic side view, wherein an energy storage device 21 is not shown in the device. For example, the tensioning cables 3 can be elastically formed, so that they themselves develop the tensile force F. From FIG. 12, it can be seen that the device has a control element 11, which is connected in a rotationally movably connected manner to the shaft end face 13 of the shaft in the region of the axis of rotation Form of an operating rope 11 includes. The operating cable 11 is deflected by a control element deflection 26, so that the operating cable 11, after being deflected by the control element deflection 26, hangs vertically downwards. When the shaft 1 is due to the application of force on the power storage device 21, not shown, and / or due to a power exercise by the elastic tension cables 3 in the end position, ie when the material web 2 is completely unwound from the shaft 1, by pulling the control cable 1, the shaft 1 are returned to their original position, wherein by pulling on the operating rope 1, the tensioning cable 3 is tensioned or the force storage device 21, not shown, is tensioned. By fixing the operating cable 11 by means of a control element fixing 18, the shaft 1 can be held at an arbitrary position.

The operating cable 11 or the operating element 11 does not necessarily have to be operated manually, but alternatively can also be driven by a motor.

Figure 13 shows an alternative embodiment of the device according to the invention in a state in which the material web 2 is completely rolled out. The device comprises, in addition to the shaft 1, a supplementary shaft 15, on the circumference of which the first attachment end 5 of the material web 2 is fastened such that the material web 2 can be wound up and down on a central portion of the additional shaft 15 by rotating the additional shaft 15 about an axis of rotation , In its two axial end regions, the additional shaft 15 in each case has an edge section 10, at the respective peripheries of which an additional tensioning cable 16 is fastened in each case. The two additional tensioning cables 16 are located on the respective edge sections 10 of the additional shaft 15 by rotation up and unrolled and attached to the support structure 8. By rotating the auxiliary shaft 15 in a Abrolldrehrichtung by which the additional shaft 15 moves toward the support structure 8, the web 2 is unrolled from the central portion of the auxiliary shaft 15, and simultaneously the additional tension cables 16 are rolled up on the respective edge portions 10 of the auxiliary shaft 15 during this Abrolldrehbewegung , On the other hand, by rotating the auxiliary shaft 15 in a Aufrolldrehrichtung by which the additional shaft 15 moves away from the support structure, the material web 2 rolled up on the central portion of the auxiliary shaft 15, and the additional tensioning cables 16 are unrolled from the respective edge portions 10 of the auxiliary shaft 15. The edge sections 10 of the additional shaft 15 are formed in the same way as the edge sections 10 of the shaft 1 in such a way that a first radial distance Rl of the material web 2 associated with any length L of the material web 2 is associated with the axis of rotation of the auxiliary shaft 15 of one of this rolling length L. second radial distance R2 of the additional tensioning cable 16 to the rotational axis of the additional shaft 15 is different. Thus, a first torque exerted on the additional shaft 15 via the material web 2 differs from a second torque exerted via the additional tensioning cables 16 on the additional shaft 15 in the direction and magnitude, so that the additional shaft 15 due to the torque difference between the first torque and the second torque a force transmitted by means of the additional tensioning cables 16 is driven.

FIG. 14 shows the device shown in FIG. 13 in a state in which the material web 2 is partly rolled up on the shaft 1 and on the additional shaft 15. Folg- lent the position of the rolled-up material web 2 in a certain range between the support structure 8 and the tensioning cable fastening device 9 is variable. It can be seen from FIGS. 13 and 14 that on an end face 13 of the auxiliary shaft in the region of the axis of rotation, an auxiliary operating element 20 is connected in a rotationally movable manner to the auxiliary shaft 15. The operation and purpose of the auxiliary operating element 20 is identical to the functioning and purpose of the operating element 11, so that reference is made to the corresponding description made above.

In an alternative embodiment, not shown in the figures embodiment, the device according to the invention may comprise two deflection devices 22, by means of which the tensioning cables 3 and the additional tensioning cables 16 are deflected. The tensioning cables 3 can be connected to one another and / or the additional tensioning cables 16 can be connected to one another. If the tensioning cables 3 and / or the additional

Tensioning cables 16 are elastic, the force necessary for the movement of the shaft 1 or the additional shaft 15 is applied by the tensioning cables 3 or by the additional tensioning cables 16 themselves. Alternatively, between the tensioning cables 3 and between the additional tensioning cables 16 there can be arranged in each case a force-storing device 21 in the form of a tension spring with which the tensioning cables 3 or the additional tensioning cables 16 are respectively connected. By a corresponding embodiment, only a single tension spring per side is necessary.

In a further and not shown embodiment, the device for winding and unwinding a mate rialbahn 2 on and from a shaft 1, 15 a plurality of material webs 2, which are rolled up side by side on the shaft 1, 15 and from this unrolled. In this case, the operating cable 11 can be fastened to the shaft 1, 15 between the material webs 2.

LIST OF REFERENCE NUMBERS

1 wave

2 material web

3 tensioning cable

4 second attachment end (the material web)

5 first attachment end (the material web)

6 knots

7 tension rope fixation

8 support structure (for first attachment end)

9 tensioning cable fastening device

10 edge section (the shaft or the additional shaft)

11 control element

12 roll-up line (of the tensioning rope)

13 shaft end face

14 guide grooves (for the tensioning cable)

15 additional wave

16 additional tensioning cable

18 Control element fixation

19 edge section (the additional wave)

20 additional control element

21 power storage device

22 deflection device (for a tensioning cable)

26 control panel deflection

F force (generated by tensioning cable or power storage device)

L roll-out length (of the material web)

R radial distance

Rl first radial distance (the material web to the

Axis of rotation)

R2 second radial distance (of the tensioning cable to the

Axis of rotation)

Claims

Claims:

1. A device for winding and unwinding a web of material (2) on and from a shaft (1, 15), the device further comprising two tensioning cables (3, 16) and having the following features:

- The material web (2) has a first attachment end (5) on which the material web (2) on a support structure (8) is directly or indirectly fastened;

the material web (2) has a second fastening end (4) opposite the first fastening end (5), which is fastened to the circumference of the shaft (1, 15) such that by rotating the shaft (1, 15) about an axis of rotation the material web (2) can be rolled up and down on a central portion of the shaft (1, 15);

the shaft (1, 15) has in its two axial end regions in each case an edge section (10), to each of which a tensioning cable (3, 16) is fastened, wherein both tensioning cables (3, 16) on the respective edge sections (10 ) by

Rotation of the shaft (1, 15) up and are unrolled; by rotating the shaft (1, 15) in a rolling direction of rotation, by which the shaft (1, 15) moves away from the support structure (8), the material web (2) from the central portion of the shaft (1, 15) unrolled and the tension cables (3, 16) are rolled up on the respective edge portions (10) of the shaft; and

- By rotating the shaft (1, 15) in a Aufroll- rotational direction, through which the shaft (1, 15) moves to the support structure (8), the material web (2) on the central portion of the shaft (1, 15 rolled up and the tension cables (3, 16) are unrolled from the respective edge portions (10) of the shaft,

characterized in that an arbitrary Ausrolllänge (L) of the material web (2) associated first radial distance (Rl) of the material web (2) to the rotational axis of one of these Ausrolllänge (L) associated second radial distance (R2) of the tensioning cable (3, 16) differs from the axis of rotation, so that a first torque exerted on the shaft (1, 15) via the material web (2) exerts itself on the shaft (1, 15) via the tensioning cables (3, 16) second torque in the direction and size such that the shaft (1, 15) due to the torque difference between the first torque and the second torque by a means of the tension cables (3, 16) transmitted force (F) is driven.

2. Apparatus according to claim 1, characterized in that the tension cables (3, 16) are elastic and in a tensioned state on the shaft (1, 15) exert a force directed away from the support structure, so that the shaft (1, 15 ) is driven by the force exerted by the tension cables (3, 16) force.

3. Device according to one of the preceding claims, characterized in that the device further comprises an energy storage device (21) which is operatively connected to the tension cables (3, 16) and on the tension cables (3, 16) directed away from the support structure force so that the shaft (1, 15) is driven by the force exerted by the force storage device (21).

4. Device according to one of the preceding claims, characterized in that the one of any rolling length (L) of the material web (2) associated first distance (Rl) of the material web (2) to the axis of rotation is greater than that of the Ausrolllänge (L) associated second distance (R2) of the tensioning cable (3, 16) to the axis of rotation, so that on the material web (2) on the shaft (1, 15) exerted first torque greater than that on the tension cables (3, 16) on the Shaft (1, 15) exerted second torque is, so that the shaft (1, 15) due to the torque difference between see the first torque and the second torque by the means of the tension cables (3, 16) transmitted force from the support structure (8 ) is driven away.

5. Device according to one of claims 1 to 3, characterized in that the one of any Ausrolllänge (L) of the material web (2) associated first distance (Rl) of the material web (2) to the axis of rotation is smaller than that of the Ausrolllänge (L) associated second distance (R2) of the tensioning cable (3, 16) to the axis of rotation, so that over the material web (2) on the shaft (1, 15) exerted first torque smaller than that on the tension cables (3, 16) on the Shaft (1, 15) is applied second torque, so that the shaft (1, 15) due to the torque difference between see the first torque and the second torque is driven by the means of the tension cables (3, 16) transmitted force to the support structure (8) to.

6. Device according to one of the preceding claims, characterized in that the two edge portions (10) of the shaft (1, 15) are cylindrical.

7. Device according to one of claims 1 to 5, characterized in that the two edge portions (10) of

Shaft (1, 15) along its respective axial extent are at least partially conical and tapering along their respective axial extent from a first diameter to a second diameter.

8. Apparatus according to claim 7, characterized in that upon rotation of the shaft (1, 15) in Abrolldrehrichtung the respective tensioning cables (3, 16) on the respective edge portions (10) of the shaft (1, 15) in the direction of rejuvenation the edge portions (10) are rolled up.

9. The device according to claim 8, characterized in that the difference between the first distance (Rl) of the material web (2) to the rotational axis and the second distance (R2) of the tensioning cable (3, 16) to the axis of rotation with increasing Ausrolllänge ( L) of the material web (2) is increased, so that the torque difference over the entire Ausrolllänge (L) of the material web (2) is substantially constant.

10. The device according to claim 7, characterized in that upon rotation of the shaft (1, 15) in Aufrolldrehrichtung the respective tension cables (3, 16) of the respective edge portions (10) of the shaft (1, 15) in the direction of thickening of the edge portions (10) are unrolled.

11. The device according to claim 10, characterized in that the difference between the second distance (R2) of the tensioning cable (3, 16) to the rotational axis and the first distance (Rl) of the material web (2) to the axis of rotation with increasing Ausrolllänge ( L) of the material web (2), so that the torque difference over the entire Ausrolllänge (L) of the material web (2) is substantially constant.

12. Device according to one of claims 3 to 11, characterized in that the force storage device (21) comprises two force storage devices (21) which are each operatively connected to a tensioning cable (3, 16).

13. The device according to claim 3 or any one of claims 4 to 12, provided that they are dependent on claim 3, characterized in that the device further comprises a with the tension cables (3, 16) and / or the power storage device (21) operatively connected to the tensioning device Clamping the force storage device (21).

14. Device according to one of the preceding claims, characterized in that the device further comprises a with a shaft end face (13) of the shaft (1, 15) rotatably connected in the region of the rotation axis or on the shaft (1) freely rotatably plugged operating element (11, 20) which is designed as an operating cable (11, 20) or as an operating lever (11, 20) or as an operating chain (11, 20), by means of which the shaft (1, 15) can be acted upon manually and / or by motor with a force ,

15. Device according to one of the preceding claims, characterized by the following features:

the apparatus further comprises a supplementary shaft (1, 15), on the circumference of which the first fastening end (5) of the material web (2) is fastened such that the material web (2) is rotated about an axis of rotation by rotating the auxiliary shaft (1, 15). on a central portion of the additional shaft (1, 15) up and is unrolled;

the additional shaft (1, 15) has in its two axial end regions in each case an edge portion (10), to each of whose respective enclosing a Zusatzspannseil (3, 16) is fixed, on the respective edge portions (10) by rotation of the additional shaft (1 , 15) are rolled up and down and can be fastened to the support structure (8);

by rotating the additional shaft (1, 15) in a roll-off rotational direction, by which the additional shaft (1, 15) moves towards the holding structure (8), the material web (2) is moved from the central section of the additional shaft (1, 15 ) and the additional tension cables (3, 16) are rolled up on the respective edge portions (10) of the auxiliary shaft (1, 15); by rotating the additional shaft (1, 15) in a roll-up rotational direction, by which the additional shaft (1, 15) moves away from the holding structure (8), the material web (2) is directed onto the central section of the additional shaft (1, 15). rolled up and the additional tension cables (3, 16) are unrolled from the respective edge portions (10) of the shaft;

a first radial distance (Rl) of the material web (2) assigned to any length of travel (L) of the material web (2) to the axis of rotation of the Additional shaft (1, 15) differs from one of these Ausrolllänge (L) associated second radial distance (R2) of the additional tensioning cable (3, 16) to the axis of rotation of the additional shaft (1, 15), so that a on the material web (2) A first torque exerted on the additional shaft (1, 15) by a second torque in the direction and magnitude exerted on the additional shaft (1, 15) via the additional tension cables (3, 16) differs such that the additional shaft (1, 15) due to the torque difference between the first torque and the second torque is driven by a force transmitted by the auxiliary tension cables (3, 16).