EP2817471B1 - Device for rolling up and unrolling a material web onto and from a shaft - Google Patents

Description

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 depends on the direction of rotation of the shaft on a central portion of the shaft by rotation about a rotation and symmetry axis Wave is rolled up and down. For guiding or for tensioning the shaft, this has at its two axial end regions in each case an edge portion, wherein a respective tensioning cable is attached to the respective peripheries of the edge portions. 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 web on the circumference of the central portion of the shaft and the attachment of the tension cables to the peripheries 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 web from the central portion of the shaft unwinds, in which 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, describes the DE 681428 an engine for the rolling and winding device on roller blinds for window fronts at dimming, 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.

A generic device for winding and unwinding a web with tension cables is off US238925A known

Object of the present invention is to provide an improved apparatus for winding and unwinding of a web on and from a shaft which comprises fewer components, is easier to install, ensures sufficient tension of the web irrespective of its Ausrolllänge and in particular in an arrangement in which the material web is unrolled obliquely or horizontally from the shaft, the shaft is still reliably driven.

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

More specifically, in the device according to the invention, a first radial distance of the material web to any desired rolling length of the material web differs from the axis of rotation of a second radial distance of the tensioning cable assigned to this rolling length to the axis of rotation. 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 tension cables are connected to the material web via the shaft, this force is exerted on the support structure, which applies a counter force according to the third Newton's law (force = counter force). 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 material web on the shaft 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, since the first distance is different 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 apparatus according to the invention serve the tension cables 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 up or from which the material web is unwound, and two tension 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. Thereby, 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, acts on the contact point of the web on the circumference of the central portion of the shaft, the torque difference between the first torque and the second torque, so that due to this torque difference, the shaft is driven so that it moves away from the support structure.

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 contact point of the tensioning cables engages the peripheries of the edge portions and causes 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 rolling and rolling movement of the shaft and a corresponding unwinding or unwinding of the material web, since the diameter of the material web changing with the rolling length of the material web the changing diameter of the Tensioning cables on the edge portions of the shaft is compensated.

Preferably, upon rotation of the shaft in Abrolldrehrichtung in which the material web unrolls from the central portion of the shaft, the respective tension cables are rolled up on the respective edge portions of the shaft in the direction of the taper of the edge portions. 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 axis of rotation decreases with increasing length of the material web, so that this becomes smaller radial first distance is compensated 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.

On the other hand, on rotation of the shaft in the roll-up direction of rotation, in which the material web is rolled up on the central section of the shaft, the respective tensioning cables are preferably unrolled from the respective edge sections of the shaft in the direction of thickening of the edge sections.

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.

In fact, as the length of the material web becomes smaller, either the tensioning cables and / or the force-storing device are shortened so that they exert a smaller force. 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 support structure.

The device preferably has a tensioning device operatively connected to the tensioning cables and / or the energy storage device for tensioning the tensioning points and / or the energy storage 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 rotatably connected to a shaft end face of the shaft in the region of the rotation axis control element, which may be configured, for example, as an operating rope or as an operating lever or as a control chain. By means of the control element, the shaft can be acted upon manually and / or motor with a force. If the power storage device and / or the tension cables are largely relaxed, the shaft can be moved by means of the control element again against the force exerted by the tension cables and / or by the force storage device in a starting position, so that the tension cables and / or the power storage device are stretched again ,

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, at the respective peripheries each an additional tensioning cable is attached, wherein the additional tensioning cables on the respective edge portions by rotation of the additional shaft are up and unrolled and 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 auxiliary 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. An arbitrary Ausrolllänge the material web associated first radial distance of the material web to the axis of rotation of the additional shaft differs from one of these Ausrolllänge associated second radial distance of Zusatzspannseils to the axis of rotation of the central shaft, so that a force exerted on the material web on the additional shaft first torque of a The second torque in the direction and magnitude exerted on the additional shaft via the additional tensioning cables differs such that the additional shaft is driven by a force transmitted by means of the additional tensioning cables due to the torque difference between the first torque and the second torque.

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.

Figur 1:

einen Schnitt durch eine Welle mit einer aufgerollten, flexiblen Materialbahn und mit einem an der Welle befestigten Spannseil;

Figur 2:

einen Schnitt durch die Welle mit einem daran befestigtem Spannseil;

Figur 3:

eine Frontalansicht bzw. eine Draufsicht auf die erfindungsgemäße Vorrichtung, bei der die Materialbahn auf der Welle aufgerollt ist;

Figur 4:

eine Frontalansicht bzw. eine Draufsicht auf die erfindungsgemäße Vorrichtung, bei der die Materialbahn von der Welle abgerollt ist;

Figur 5:

einen Schnitt durch einen Teil des Zentralabschnitts der Welle und durch einen Endbereich der Welle, wobei die Materialbahn auf dem Zentralabschnitt aufgewickelt und das Spannseil von dem Randabschnitt abgerollt ist;

Figur 6:

die in Figur 5 dargestellte Vorrichtung, wobei die Materialbahn von dem Zentralabschnitt und das Spannseil auf dem Randabschnitt aufgerollt ist;

Figur 7:

ein Schnitt durch einen Endbereich des Zentralabschnitts der Welle und durch einen Randabschnitt der Welle, der Führungsrillen für das Spannseil aufweist;

Figur 8:

eine schematische Seitenansicht der erfindungsgemäßen Vorrichtung, bei der ein erster radialer Abstand der Materialbahn zur Drehachse größer ist als ein zweiter radialer Abstand des Spannseils zur Drehachse;

Figur 9:

ein Diagramm zum Darstellen der Abhängigkeiten des ersten radialen Abstandes und des zweiten radialen Abstandes von der Ausrolllänge der Materialbahn;

Figur 10:

eine schematische Seitenansicht der erfindungsgemäßen Vorrichtung, bei der der erste radiale Abstand der Materialbahn zur Drehachse kleiner ist als der zweite radiale Abstand des Spannseils zur Drehachse;

Figur 11:

ein Diagramm zur Darstellung der Abhängigkeiten des ersten radialen Abstandes und des zweiten radialen Abstandes von der Ausrolllänge der Materialbahn;

Figur 12:

eine Seitenansicht der erfindungsgemäßen Vorrichtung mit einem an der Welle befestigten Bedienelement, wobei die Materialbahn eine schräge Ausrichtung aufweist;

Figur 13:

eine Frontalansicht bzw. eine Draufsicht auf die erfindungsgemäße Vorrichtung gemäß einer weiteren Ausführungsform, die zwei Wellen umfasst, auf der die Materialbahn aufgewickelt werden kann, wobei die Materialbahn von den zwei Wellen abgerollt ist; und

Figur 14:

die in Figur 13 dargestellte Vorrichtung, bei der die Materialbahn auf den zwei Wellen größtenteils aufgewickelt ist.

Further advantages, details and features of the invention will become apparent from the illustrated embodiments. In detail:

FIG. 1:

a section through a shaft with a rolled-up, flexible material web and with a shaft attached to the tensioning cable;

FIG. 2:

a section through the shaft with a tensioning cable attached thereto;

FIG. 3:

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;

FIG. 4:

a front view and a plan view of the device according to the invention, in which the material web is unrolled from the shaft;

FIG. 5:

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;

FIG. 6:

in the FIG. 5 illustrated apparatus, wherein the web of material from the central portion and the tensioning cable is rolled up on the edge portion;

FIG. 7:

a section through an end portion of the central portion of the shaft and through an edge portion of the shaft, the guide grooves for the tensioning cable;

FIG. 8:

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;

FIG. 9:

a diagram showing the dependencies of the first radial distance and the second radial distance of the Ausrolllänge the material web;

FIG. 10:

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;

FIG. 11:

a diagram illustrating the dependencies of the first radial distance and the second radial distance from the Ausrolllänge the material web;

FIG. 12:

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:

a frontal view and a plan view of the device according to the invention according to 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:

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

In the following description, like reference numerals denote 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, at the periphery of a second attachment end of a material web 2 is attached. The material web 2 is wound on the shaft 1 and releases from the shaft at a tangency point at which the material web in the in FIG. 1 Oriented orientation runs vertically upwards.

How out FIG. 2 it can be seen, 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 is knotted together within the shaft to a node 6, so that there is a tension rope attachment 7. 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. If, on the other hand, in the illustration of Figures 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.

FIG. 3 shows a schematic representation of the device according to the invention in a front 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 mentioned above with reference to FIG. 1 explained, a second attachment end 4 is attached to the circumference of the shaft 1. The material web 2 is in the representation of FIG. 3 completely rolled up 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 peripheries 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 cable fastening 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 control element 11, the shaft can be moved up and / or down, so that during a downward movement, the material web 2 rolls from the central portion of the shaft 1, and at an upward movement of the shaft 1, the material web 2 on the central portion of the shaft. 1 roll up.

FIG. 5 shows a section through a part of the central portion and by an edge portion 10 of the shaft 1 of the device in a state in which the material web 2 largely rolled up on the shaft 1 and the tensioning cable 3 is largely unrolled from the edge portion 10. This condition is the same as in FIG. 3 illustrated state of the device. FIG. 6 shows the same area in cross section as FIG. 5 , where in FIG. 6 the material web 2 largely unrolled from the shaft 1 and the tensioning cable 3 is largely rolled up on the edge portion 10 of the shaft 1. This condition is the same as in FIG. 4 illustrated state.

From the FIGS. 5 and 6 It can be seen that the edge portion 10 of the shaft 1 along its axial extent 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 web 2 is always uniformly or approximately evenly stretched regardless of a Ausrolllänge L of the web 2. Because during the rolling of the material web 2, a first radial distance R1 of the material web 2 is reduced to the axis of rotation of the shaft 1. This during the unrolling of the material web 2 from the shaft 1 becoming smaller first radial distance R1 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 decreases appreciably. 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.

FIG. 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 Ausrolllänge L of the material web, which represents the length of the unrolled material web 2 of the support structure 8 to the point of contact of the material web 2 with the shaft 1, is in the in FIG. 8 state illustrated about 50% of the maximum Ausrolllänge L.

The tensioning cable 3 is in the in FIG. 8 shown partially rolled up 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 an energy 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.

Out FIG. 8 it can be seen that a first radial distance R1 of the material web 2 to the axis of rotation of the shaft 1 is greater than a second radial distance R2 of the tension cables 3 to the axis of rotation of the shaft 1. Consequently, a force exerted on the material web 2 on the shaft 1 first torque greater than a second torque exerted on the shaft 1 via the tensioning cables 3, because the first radial distance R1 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 to the tensile force F , which engages the periphery of the edge portion 10 of the shaft 1. Both torques are aligned with each other, so that a difference torque results. Since that exerted on the web 2 on the shaft 1 first torque is greater than the torque applied via the tension cables to the edge portions 10 shaft second torque, and since the first torque rotation of the shaft in the representation of the FIG. 8 Counterclockwise causes the differential torque causes a rotation of the shaft 1 in the counterclockwise direction in the representation of FIG. 8 , Upon rotation of the shaft 1 in the counterclockwise direction, the material web 2 rolls off from the central portion of the shaft 1, wherein at the same time the tension cables 3 are rolled onto the edge portion 10 of the shaft 1.

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 a rolled-out 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 downgrade component gravity, which in addition to a rolling of the web 2 of the shaft 1 contributes.

In the apparatus according to the invention is thus ensured that the unrolled material web 2 is stretched 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 R1 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 substantially constant over the entire Ausrolllänge L of the web 2, the shape of the edge portions 10 may be adapted such that the difference between the first distance R1 of the 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 related context is in FIG. 9 shown, from which it is apparent that with increasing Ausrolllänge L of the material web 3 of the second radial distance R2 of the tensioning cable 3 to the axis of rotation falls steeper 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 R1 and the second radial distance R2 is greater. The product of tensile force F and difference of the radial distances R2 and R1 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 a side view of the device according to the invention shows, in which the material web 2 is unrolled from the shaft 1 due to the application of force by the force storage device 21, shows FIG. 10 the device according to the invention, in which the material web 2 is rolled up on the shaft 1 due to the tensile force F exerted by the force storage device 21. For this purpose, for any length L of the material web 2, the first distance R1 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 force exerted on the material web 2 via the shaft 1 first torque is smaller than that exerted on the tension cables 3 on the shaft 1 second torque. The scalar quantities of the first and second torques are symbolic with arrows of different sizes FIG. 10 shown. 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 representation of FIG. 1 is rotated clockwise, in which the material web 2 is rolled onto the central portion of the shaft 1.

At the in FIG. 10 1, 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 in the representation of FIG. 10 located on the far right. 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 energy storage device 21 reduces as the Auslauflänge L of the web 2 decreases the force exerted by the force storage device 21 force F. So that the shaft 1 is transferred from the force storage device 21 at a constant speed in its final position, the differential torque must be constant. To achieve this, as in FIG. 11 shown, the difference between the second distance R2 of the tensioning cable 3 to the axis of rotation and the first distance R1 of the material web 2 to the axis of rotation with increasing Ausrolllänge L of the web become smaller. 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 the device, a force storage device 21 is not shown. The tensioning cables 3 may for example be elastic, so that they themselves develop the tensile force F. Out FIG. 12 It can be seen that the device has a rotatably connected to the shaft end face 13 of the shaft in the region of the rotation axis control element 11 in 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. If the shaft 1 due to the application of force on the power storage device 21, not shown, and / or due to a force exerted by the elastic tension cables 3 in the end position, ie if the material web 2 is completely unwound from the shaft 1, by pulling the control cable 1 the Shaft 1 are transferred back to their initial position, wherein the tensioning cable 3 is stretched by pulling on the control cable 1 and the power 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.

FIG. 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 apparatus 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 rolled up and unrolled 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 tension cables 16 are on the respective edge portions 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 portions 10 of the additional shaft 15 are formed as well as the edge portions 10 of the shaft 1 such that an arbitrary Ausrolllänge L of the web 2 associated first radial distance R1 of the web 2 to the axis of rotation of the auxiliary shaft 15 of one of these Ausrolllänge L associated second radial Distance R2 of the additional tensioning cable 16 differs from the axis of rotation of the additional shaft 15. 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 in FIG. 13 shown device in a state in which the material web 2 is partially rolled up on the shaft 1 and on the additional shaft 15. consequently the position of the rolled-up material web 2 is variable in a certain area between the holding structure 8 and the tensioning cable fastening device 9.

From the FIGS. 13 and 14 It can be seen that on a shaft end face 13 of the additional shaft in the region of the axis of rotation of an auxiliary control element 20 is rotatably connected 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, the device according to the invention may comprise two deflection devices 22, by means of which the tensioning cables 3 or the additional tensioning cables 16 are deflected. The tension cables 3 may be connected to each other and / or the additional tension cables 16 may be connected to each other. If the tensioning cables 3 and / or the additional tensioning cables 16 are elastic, the force required for the movement of the shaft 1 or the auxiliary shaft 15 is applied by the tensioning cables 3 or by the additional tensioning cables 16 themselves. Alternatively, between each of the tensioning cables 3 and between the additional tensioning cables 16 there can be arranged an energy storage 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 comprises for winding and unwinding of a material web 2 on and from a shaft 1, 15 a plurality of webs 2, which are rolled up side by side on the shaft 1, 15 and from this unrolling. In this case, the operating cable 11 may be fastened between the material webs 2 on the shaft 1, 15.

LIST OF REFERENCE NUMBERS

1

wave

2

web

3

tether

4

second attachment end (the material web)

5

first attachment end (the material web)

6

node

7

Tension cable fixation

8th

Holding structure (for the first attachment end)

9

Tension cable fastening device

10

Edge section (of the shaft or the additional shaft)

11

operating element

12

Roll-up line (of the tensioning rope)

13

Wave front side

14

Guide grooves (for the tensioning cable)

15

additional shaft

16

Additional tension cable

18

Operating element fixation

19

Edge section (the additional wave)

20

Additional control element

21

Power storage device

22

Deflection device (for a tensioning cable)

26

Operating element deflection

F

Force (generated by tensioning cable or power storage device)

L

Roll-out length (of the material web)

R

radial distance

R1

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 (15)

1. Device for rolling up and unrolling a material web (2) onto and from a shaft (1, 15), the device further comprising two tensioning ropes (3, 16) and having the following features:

   - the material web (2) comprises a first fastening end (5), at which the material web (2) can be directly or indirectly fastened to a holding structure (8);

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

   - the shaft (1, 15) comprises a rim portion (10) in each of the two axial end regions thereof, a tensioning rope (3, 16) in each case being fastened to the respective circumferences of said rim portions, it being possible to roll up and unroll the tensioning ropes (3, 16) on the respective rim portions (10) by rotating the shaft (1, 15);

   - by rotating the shaft (1, 15) in an unrolling direction, making the shaft (1, 15) move away from the holding structure (8), the material web (2) is unrolled from the central portion of the shaft (1, 15) and the tensioning ropes (3, 16) are rolled up on the respective rim portions (10) of the shaft; and

   - by rotating the shaft (1, 15) in a roll-up direction, making the shaft (1, 15) move towards the holding structure (8), the material web (2) is rolled up onto the central portion of the shaft (1, 15) and the tensioning ropes (3, 16) are unrolled from the respective rim portions (10) of the shaft,

   characterised in that a first radial distance (R1) assigned to any given roll-out length (L) of the material web (2), between the material web (2) and the axis of rotation, differs from a second radial distance (R2) assigned to this roll-out length (L), between the tensioning rope (3, 16) and the axis of rotation, in such a way that a first torque exerted on the shaft (1, 15) via the material web (2) differs in direction and magnitude from a second torque exerted on the shaft (1, 15) via the tensioning ropes (3, 16), in such a way that the shaft (1, 15) is driven by a force (F) transmitted via the tensioning ropes (3, 16) as a result of the torque difference between the first torque and the second torque.
2. Device according to claim 1, characterised in that the tensioning ropes (3, 16) are resilient and when tensioned exert a force directed away from the holding structure on the shaft (1, 15) in such a way that the shaft (1, 15) is driven by means of the force exerted by the tensioning ropes (3, 16).
3. Device according to either of the preceding claims, characterised in that the device further comprises a force storage device (21), which is operatively connected to the tensioning ropes (3, 16) and exerts a force directed away from the holding structure on the tensioning ropes (3, 16), in such a way that the shaft (1, 15) is driven by means of the force exerted by the force storage device (21).
4. Device according to any of the preceding claims, characterised in that the first distance (R1) assigned to any given roll-out length (L) of the material web (2), between the material web (2) and the axis of rotation, is greater than the second distance (R2) assigned to this roll-out length (L), between the tensioning rope (3, 16) and the axis of rotation, in such a way that the first torque exerted on the shaft (1, 15) via the material web (2) is greater than the second torque exerted on the shaft (1, 15) via the tensioning ropes (3, 16), in such a way that the shaft (1, 15) is driven away from the holding structure (8) by the force transmitted via the tensioning ropes (3, 16) as a result of the torque difference between the first torque and the second torque.
5. Device according to any of claims 1 to 3, characterised in that the first distance (R1) assigned to any given roll-out length (L) of the material web (2), between the material web (2) and the axis of rotation, is smaller than the second distance (R2) assigned to this roll-out length (L), between the tensioning rope (3, 16) and the axis of rotation, in such a way that the first torque exerted on the shaft (1, 15) via the material web (2) is smaller than the second torque exerted on the shaft (1, 15) via the tensioning ropes (3, 16), in such a way that the shaft (1, 15) is driven towards the holding structure (8) by the force transmitted via the tensioning ropes (3, 16) as a result of the torque difference between the first torque and the second torque.
6. Device according to any of the preceding claims, characterised in that the two rim portions (10) of the shaft (1, 15) are cylindrical.
7. Device according to any of claims 1 to 5, characterised in that the two rim portions (10) of the shaft (1, 15) are formed conically along the respective axial extensions thereof, at least in part, and taper from a first diameter to a second diameter along the respective axial extensions thereof.
8. Device according to claim 7, characterised in that when the shaft (1, 15) is rotated in the unrolling direction the respective tensioning rope (3, 16) is rolled up on the respective rim portions (10) of the shaft (1, 15) in the direction of the tapering of the rim portions (10).
9. Device according to claim 8, characterised in that the difference between the first distance (R1), between the material web (2) and the axis of rotation, and the second distance (R2), between the tensioning rope (3, 16) and the axis of rotation, increases as the roll-out length (L) of the material web (2) increases, in such a way that the torque difference is substantially constant over the entire roll-out length (L) of the material web (2).
10. Device according to claim 7, characterised in that when the shaft (1, 15) is rotated in the roll-up direction the respective tensioning ropes (3, 16) are unrolled from the respective rim portions (10) of the shaft (1, 15) in the direction of the widening of the rim portions (10).
11. Device according to claim 10, characterised in that the difference between the second distance (R2), between the tensioning rope (3, 16) and the axis of rotation, and the first distance (R1), between the material web (2) and the axis of rotation, decreases as the roll-out length (L) of the material web (2) increases, in such a way that the torque difference is substantially constant over the entire roll-out length (L) of the material web (2).
12. Device according to any of claims 3 to 11, characterised in that the force storage device (21) comprises two force storage means (21), which are each operatively connected to a tensioning rope (3, 16).
13. Device according to claim 3 or any of claims 4 to 12 when dependent on claim 3, characterised in that the device further comprises a tensioning means, operatively connected to the tensioning ropes (3, 16) and/or to the force storage device (21), for tensioning the force storage device (21).
14. Device according to any of the preceding claims, characterised in that the device further comprises an operating element (11, 20), which is connected to an end face (13) of the shaft (1, 15) in the region of the axis of rotation so as to be rotatable or is placed in free rotation on the shaft (1), and which is configured as an operating rope (11, 20), operating lever (11, 20) or operating chain (11, 20), and by means of which a force can be applied to the shaft (1, 15) by hand and/or by a motor.
15. Device according to any of the preceding claims, characterised by the following features:

    - the device further comprises an additional shaft (1, 15), on the circumference of which the first fastening end (5) of the material web (2) is fastened, in such a way that the material web (2) can be rolled up and unrolled on a central portion of the additional shaft (1, 15) by rotating the additional shaft (1, 15) about an axis of rotation;

    - in each of the two axial end regions thereof, the additional shaft (1, 15) comprises a rim portion (10), on the respective circumference of which a respective additional tensioning rope (3, 16) is fastened, it being possible to roll up and unroll said additional tensioning ropes on the respective rim portions (10) by rotating the additional shaft (1, 15) and to fasten them to the holding structure (8);

    - rotating the additional shaft (1, 15) in an unrolling direction, making the additional shaft (1, 15) move towards the holding structure (8), causes the material web (2) to unroll from central portion of the additional shaft (1, 15) and the additional tensioning ropes (3, 16) to be rolled up on the respective rim portions (10) of the additional shaft (1, 15);

    - rotating the additional shaft (1, 15) in a roll-up direction, making the additional shaft (1, 15) move away from the holding structure (8), causes the material web (2) to roll up on the central portion of the additional shaft (1, 15) and the additional tensioning ropes (3, 16) to be unrolled from the respective rim portions (10) of the shaft;

    - a first radial distance (R1) assigned to any given roll-out length (L) of the material shaft (2), between the material web (2) and the axis of rotation, differs from a second radial distance (R2) assigned to this roll-out length (L), between the additional tensioning rope (3, 16) and the axis of rotation of the additional shaft (1, 15), in such a way that a first torque, exerted on the additional shaft (1, 15) via the material web (2), differs in direction and magnitude from a second torque, exerted on the additional shaft (1, 15) via the additional tensioning ropes (3, 16), in such a way that the additional shaft (1, 15) is driven by the force transmitted via the additional tensioning ropes (3, 16) as a result of the torque difference between the first torque and the second torque.

Images