Device for Unwinding a Material Web from One or More Material Web Rolls

Description

The invention relates to a device for unwinding a material web from one or more material web rolls.

Such devices are already known for numerous applications. For example, material webs often have to be unwound from a first material web roll. Paper webs are often provided as material webs, but plastic webs are also provided. The invention is therefore described in general terms below with reference to a material web. Both paper and plastic webs are often required in order to produce such tubes in a tube manufacturing machine, which are later required to form bags and sacks. Several of the devices mentioned at the beginning are usually provided in the machine for producing tubes, since the tubes are often multi-layer tubes. For example, such tubes can each comprise two paper layers which enclose a plastic layer. In this case, three of the devices mentioned at the beginning are required to unwind the material web.

To enable continuous unwinding of a material web, a further material web roll can be fed to the device. The start of its material web must be connected to the end of the material web roll that is being unwound. In addition, the first material web roll is to be removed from the unwinding point and the further material web roll is to be placed at the position of the first material web roll at the winding point.

After this change of the material web roll, the other material web roll forms the first material web roll, so that the described change can take place again after an unwinding time.

Such devices, which enable continuous unwinding of a material web, in particular from several material web rolls, take up a large installation space. In applications in which several devices are required within one machine, a particularly large amount of space is therefore necessary.

The task of the present invention is therefore to propose a device of the same type which is compact in design and therefore space-saving.

The problem is solved by a device according to claim 1.

The device according to the invention for unwinding a material web from a plurality of material web rolls has

• • a machine frame,
  • a main bearing point arranged and in particular fastened to the machine frame for rotatably bearing a first shaft for a first material web roll, wherein the material web roll can be unwound,
  • a first drive shaft for rotationally driving the first material web roll, wherein the first drive shaft can be directly or indirectly adjusted to the outer circumference of the first material web roll to transmit the drive force,
  • a first pivot arm pair, the pivot arms of which are pivotably mounted in the machine frame, one end of the first drive shaft being rotatably mounted in each pivot arm,
  • a secondary bearing point arranged on the machine frame, with which the shaft can be transferred from the main bearing point and/or is provided for bearing a second shaft for a second material web roll,
  • a second drive shaft for rotationally driving a material web roll mounted on the secondary bearing point, wherein the second drive shaft can be directly or indirectly adjusted to the outer circumference of the material web roll mounted on the secondary bearing point to transmit the drive force
  • a second pair of pivot arms, the pivot arms of which are pivotably mounted in the machine frame, one end of the second drive shaft being rotatably mounted in each pivot arm,
  • wherein the pivot arms of the first pair of pivot arms are arranged further outwards in relation to the machine frame than the pivot arms of the second pair of pivot arms when viewed from the central vertical of the first and/or second drive shaft.

In the device according to the invention, a machine frame is thus initially provided, which can in particular be designed as a rack frame. For example, a rectangular frame formed from tubes can be the basis for further features of the invention, which are described below. Features described below, i.e. functional elements of the invention, can be connected directly to the machine frame in a fixed or movable manner or can be arranged indirectly on it via further intermediate components.

A first shaft, which can also be referred to as a support shaft, is provided to support the first material web roll. This shaft can be rotatably mounted in a main bearing for unwinding. This main bearing point is arranged on or in the machine frame. Preferably, the main bearing point or some of its components are fixed, i.e. immovable, on the machine frame. For example, the main bearing point can comprise two bearing surfaces, which are preferably spaced apart in the axial direction of the shaft, so that the shaft can be placed with its ends on the bearing surfaces.

In one embodiment, the support surfaces can be surrounded by a pair of supports, whereby the supports of the pair of supports are also spaced apart. This arrangement just described makes it possible to unwind the material web from the material web roll.

To unwind the material web, the roll and/or the support shaft is generally driven. According to the invention, a drive shaft is provided for rotationally driving the first material web roll, wherein the drive shaft can be directly or indirectly adjusted to transmit the material web roll to its outer circumference. By directly is meant that the drive shaft itself can be force-fitted to the outer circumference of the material web roll. By directly, it is meant that the drive shaft carries at least one further element which is connected to the drive shaft in a rotationally fixed manner and transmits the drive force to the outer circumference of the material web roll. Such an element can be at least one sleeve or at least one drive wheel.

In order to allow the drive shaft to act continuously on the outer circumference of the material web roll, even if its circumference is reduced over time, the drive shaft must be movable relative to the material web roll and thus relative to the main bearing point. For this purpose, it is provided according to the invention that each end of the drive shaft can be mounted in a respective pivot arm of a first pair of pivot arms, the pairs of pivot arms in turn being pivotably mounted on or in the machine frame. In particular, one end of the drive shaft is mounted in or at one end of each pivot arm, while the second end of each pivot arm is rotatably connected to the machine frame. Preferably, each of these pivot arms of the first pair of pivot arms can be pivoted by means of a drive, whereby this drive can be designed as a piston-cylinder unit. Each of these piston cylinder units is preferably also supported on the machine frame.

When the first material web roll is almost unwound, a roll change is necessary. To enable this, a secondary bearing point is provided, which is arranged in or on the machine frame.

With the secondary bearing point, the shaft and thus in particular the first material web roll can be removed from the main bearing point. This removal is preferably carried out when the first material web roll is almost unwound, for example when more than 70%, in particular more than 80% and preferably 90% of the original length of the material web has already been unwound. In this case, the secondary bearing point can be provided with a lower load-bearing capacity than the main bearing point, which means that the secondary bearing point can be constructed cost-effectively. However, it may also be possible for a new material web roll to be fed to the device by depositing it in the secondary bearing point and keeping it ready for use. After the material web has been unwound from the first material web roll, the new, second material web roll can then be fed to the main bearing point, so that the unwinding process can then be continued.

A second drive shaft is provided to drive the material web roll, which is located on the secondary bearing point, which in turn acts on the outer circumference of the material web roll mounted on the secondary bearing point and transmits the drive force to it. The second drive shaft can in turn transmit the drive force to the material web roll directly, i.e. via direct contact, or indirectly via other elements transmitting the drive force.

A second pair of pivot arms is provided in order to be able to react to a decreasing diameter of the material web roll mounted on the secondary bearing point. One end of the second drive shaft is located in each pivot arm of this pair of pivot arms. The pivot arms are also pivotably mounted in the machine frame. Preferably, the pivot arms of the second pair of pivot arms are also pivoted by actuators, which can be designed as piston-cylinder units. With a piston-cylinder unit, which can preferably be operated with compressed air, the pressure force of the drive shaft on the material web roll can be kept constant or essentially constant even as its circumference decreases.

According to the invention, it is further provided that the pivot arms of the first pair of pivot arms are located further outwards from the central vertical of the first and/or the second drive shaft than the pivot arms of the second pivot arm pair. In other words, the pivot arms of the first pair of pivot arms are spaced further apart from the center lines of the first and/or second drive shafts than the pivot arms of the second pair of pivot arms.

Instead of the center lines of the first and/or second drive shafts, the center plane defined by these center lines can also be used as a reference plane for describing the invention. The same applies to the center plane of the machine frame, which will be explained later.

The described arrangement makes it possible for the first and second drive shafts to bear against the first material web roll simultaneously, at least for a short time, without collisions occurring in the area of the pivot arms. Looking in the axial direction of the first support shaft carrying the first material web roll, it is thus possible to arrange both pairs of pivot arms on the right or left side of the vertical plane defined by the axis of the support shaft, which ultimately leads to the desired compact design of the device according to the invention. Furthermore, this arrangement allows the other side to be freely accessible in order to remove the unwound material web roll and/or feed in a new material web roll, whereby the risk of damage to a transport device and/or the risk of injury to the operating personnel is reduced or even completely eliminated.

In a particularly preferred further development of the invention, it is provided that the radial extension of the first pair of pivot arms is greater than the radial extension of the second pair of pivot arms. The radial extension of a pivot arm is the direct distance between a pivot bearing of the pivot arm, with which in particular the pivot arm is mounted on the machine frame, and the bearing of the drive shaft, which is mounted in this pivot arm.

This direct distance is therefore greater for the pivot arms of the first pair of pivot arms than for the pivot arms of the second pair of pivot arms.

If one now looks in the direction of the central vertical of the first and/or the second drive shaft, a frame formed by the first pair of pivot arms and the first drive shaft surrounds the frame formed by the second pair of pivot arms and the second drive shaft, preferably in any pivot position that each pair of pivot arms can assume relative to the machine frame. This ensures that the pairs of pivot arms and the respective associated drive shafts do not interfere with each other in any operating situation and, in particular, do not collide.

In a further, advantageous embodiment of the invention, the secondary bearing point comprises a third pair of pivot arms, the pivot arms of which are pivotably mounted in the machine frame and, viewed from the central vertical, are arranged further outwards than the pivot arms of the second pair of pivot arms and, in particular, are arranged further inwards than the pivot arms of the first pair of pivot arms. This means that the secondary bearing point is designed similarly to the first pair of pivot arms and/or the second pair of pivot arms. This means that the pivot arms of the secondary bearing point are also each connected to the machine frame at a first end via a pivot bearing, while the second ends are designed and arranged to support the ends of the shaft carrying the material web roll. In this embodiment, it is advantageous that the pivot arms of the second pair of pivot arms cannot collide with the pivot arms of the secondary bearing point, since the pivot arms of the second pair of pivot arms are arranged further “inside”. This means that the pivot bearings of the two aforementioned pairs of pivot arms can be arranged at a very short distance from one another, which contributes to the compact design of the device according to the invention. Preferably, the pivot movement of the pivot arms of the third pair of pivot arms can be caused by means of spindle drives. For this purpose, a spindle drive motor can be supported on the machine frame and a spindle nut can be arranged on the respective pivot arm.

The spindle can be driven in rotation by the spindle drive motor, so that the rotation of the spindle, which is screwed into the spindle nut, enables the relevant pivot arm to pivot. In particular, the spindle nut is pivotably attached to the pivot arm, whereas the spindle drive motor is pivotably arranged on the machine frame.

It is advantageous to provide a fourth pair of pivot arms, in the pivot arms of which the ends of a cutting device, in particular a cutting beam, are mounted. This cutting device is used to cut through the first material web when the start of the second material web has been attached to the first material web. In particular, it is provided that the pivot arms of the fourth pair of pivot arms are arranged further inwards in relation to the machine frame, as seen from the central vertical of the first and/or second drive shaft, than the main bearing point and/or pivot arms of the first pair of pivot arms.

Advantageously, a force-providing device is provided, with which a force can be applied to the second pivot arm, whereby the force-providing device is supported on the third pivot arm. The fact that the power supply device is supported on both pivot arms allows the second pivot arm to pivot relative to the machine frame without having to adjust the pivot position of the third pivot arm. The second pivot arm and the third pivot arm can therefore be seen as a movement unit relative to the machine frame. The force-providing device can again be a spindle-spindle nut combination or a piston-cylinder unit. In the latter case, this can preferably be operated with compressed air. On the one hand, the contact pressure can be adjusted and, on the other hand, there is a tolerance for concentricity. The force-providing device is preferably pivotably mounted on the second and third pivot arm.

It is even advantageous if the pivot bearings of the second pair of pivot arms and the pivot bearings of the third pair of pivot arms are aligned with each other. In this case, the device has a particularly compact and simple design. Axles can be provided in the machine frame, on each of which one pivot arm of the second pair of pivot arms and one pivot arm of the third pair of pivot arms are supported via pivot bearings.

Furthermore, it is advantageous if the radial extension of the pivot arms of the third pair of pivot arms is smaller than the radial extension of the pivot arms of the first pair of pivot arms and/or is greater than or equal to the radial extension of the pivot arms of the second pair of pivot arms. The radial extension is to be understood in relation to the pivot arms of the third pair of pivot arms in the same way as described above in relation to the first and second pair of pivot arms.

In particular, this embodiment means that the frame formed by the first pair of pivot arms and the first drive shaft also encloses the frame formed by the third pair of pivot arms and the shaft carrying the material web roll. This in turn allows a compact design of the device according to the invention to be achieved.

In a further embodiment of the invention, it can be particularly advantageous if the radial extent of the pivot arms of the third pair of pivot arms is the same as the radial extent of the pivot arms of the second pair of pivot arms. In this embodiment, the second drive shaft can be pivoted to the material web roll and can be pressed against the material web roll with a pressing force, wherein the force vector of the pressing force essentially runs in a direction which is defined by a connecting line between the second drive shaft and the shaft which carries the material web roll in the secondary bearing point. In particular, the pressing force runs exactly in the described direction when the axes of the pivot bearings of the second and third pair of pivot arms are with each other. The described direction of the pressing force is maintained even if the diameter of the material web roll decreases as a result of unwinding.

In an advantageous embodiment of the invention, at least one pivot arm of the first and/or the second pair of pivot arms each comprises a drive for driving the drive shaft in rotation. Preferably, the drive is designed as an electric motor which applies a torque to the drive shaft. One or more intermediate shafts and/or gear stages can be provided between the drive and the drive shaft. It is advantageous if the electric motor is arranged in such a way that its rotor runs at least partially parallel to the extension of the pivot arm. The term “extension” in relation to a pivot arm has already been explained above. The term “at least partially parallel” also includes the fact that the axis can be pivoted when viewed in the circumferential direction of the drive shaft. Overall, this arrangement of the drive means that the electric motor requires a small installation space in the axial direction of the drive shaft, whereby the device according to the invention has a compact design.

It is advantageous if a rotor shaft of the drive is connected to the drive shaft in a torque-transmitting manner by means of a deflection gear. A deflection gear leads to a particularly space-saving design, especially in conjunction with an at least partially parallel arrangement of the rotor shaft to the extension of the relevant pivot arm.

In an advantageous embodiment of the invention, it is provided that the first pivot arm of the first and/or the second pair of pivot arms carries a drive motor for driving the first and/or the second drive shaft, wherein the second pivot arm of the first and/or the second pair of pivot arms carries a balancing device for balancing the weight of the drive motor. This aspect of the invention may also constitute an independent invention. Advantageously, the weight force acting on the respective pivot arm due to the motor also acts—at least partially—on the second pivot arm.

This prevents a different pressure force over the axial length of the drive shaft, which could otherwise lead to an uneven unwinding of the material web or even damage to the material web roll.

Furthermore, it is advantageous if at least one pivot arm of the second pair of pivot arms carries a drive for rotationally driving the second drive shaft, wherein the pivot arm of the first pair of pivot arms, which is arranged on the same side as the pivot arm of the second pair of pivot arms carrying the drive when viewed from the central vertical, is arranged at a distance from the pivot arm carrying the drive which is greater than the mounting depth of the drive. In other words, it is provided that said pivot arm of the first pair of pivot arms is so far away from the pivot arm of the second pair of pivot arms carrying the drive that both pivot arms can be moved past each other without a collision occurring between said pivot arm of the first pair of pivot arms and the drive motor. This ensures that the first pair of pivot arms and the second pair of pivot arms do not collide, even if one of the pivot arms of the second pair of pivot arms carries the drive.

In a further, advantageous embodiment, a pivot arm of the first pair of pivot arms, in particular the pivot arm of the first pair of pivot arms, which is arranged on the same side as the pivot arm of the second pair of pivot arms carrying the drive, as seen from the central vertical, carries a drive. The drives of both drive shafts are therefore located on one side of the device, which improves the accessibility of the drives. It is advantageous if the drive is arranged on the side of the first pivot arm facing away from the second pair of pivot arms, so that both pivot arms can be arranged close to each other, which further improves the compact design of the entire device.

Further advantages, features and details of the invention are shown in the following description, in which various embodiments are explained in detail with reference to the figures. The features mentioned in the claims and in the description may be essential to the invention individually or in any combination of the features mentioned. In the context of the entire disclosure, features and details which are described in connection with the method according to the invention naturally also apply in connection with the device according to the invention and vice versa, so that reference is or can always be made mutually to the individual aspects of the invention with respect to the disclosure. The individual figures show:

FIG. 1 Side view of a device according to the invention in unwinding mode

FIG. 2 Side view as in FIG. 1, but with the secondary bearing point pivoted to the main bearing point

FIG. 3 Side view as in FIG. 2, but with the web roll removed from the main bearing point by the secondary bearing point

FIG. 4 Side view as in FIG. 3, but with the first web roll deposited and the material web unwound from the second material web roll FIG. 5 Top view of a device according to the invention FIG. 6 View VI-VI from FIG. 1.

FIG. 1 shows a device 100 according to the invention for unwinding a material web 101 in unwinding mode.

The device 100 primarily comprises a machine frame 102, which comprises a large number of largely unspecified components. The machine frame 102 comprises a base frame 103 and a longitudinal member 104 extending in the direction x, which is supported on the base frame 103.

Furthermore, a main bearing point 105 is provided, which is arranged in particular on the machine frame 102. This main bearing point 105 comprises as essential elements a vertical support 106, i.e. a support extending in the direction Y, as well as a support element 107 with a receptacle 108 for a shaft 109, whereby the vertical support and the support element can be designed as one unit. The holder for the shaft is shown in FIG. 1 as a simple trough, but the structure is more complex, although this is not shown for the sake of clarity.

The shaft 109 carries a first material web reel 110, onto which the material web 101, which is being unwound, is wound. The material web 101 is drawn off via a plurality of guide elements and/or deflection rollers, of which a deflection roller 111 is shown as an example, and fed, for example, to a tube forming station.

As the material web winder 110 is generally very heavy and the material web is not sufficiently tear-resistant, the material web winder cannot be moved using the tensile force applied to the material web. It is therefore intended that a drive force acts on the material web reel 110 to drive it rotationally. In the embodiment shown, this driving force is transmitted to the circumferential surface of the reel 110. For this purpose, a first drive shaft 120 can be provided, which can be driven rotationally and, for example, rests against the circumferential surface of the reel 110. However, it is also possible that the first drive shaft carries two or more first drive disks 121 which transmit the drive force to the circumferential surface of the material web winder 110.

The driving force is provided by a first drive motor 180, which is explained in more detail below in connection with FIG. 6. The first drive shaft 120 is rotatably mounted in a first pivot arm pair, the pivot arm 122 of the first pivot arm pair being visible in FIG. 1. The pivot arm 122 is pivotably mounted in the longitudinal member 104 via a pivot bearing 123.

A first pivot drive 124 is provided for pivoting the pivot arm 122. The first end of this is supported in an articulated manner on the machine frame 10, in particular on its carrier 104, via a first spherical bearing 125. The pivot arm 122 is connected to the pivot drive 124 in an articulated manner via a second spherical bearing 126. The pivot drive itself can be designed in particular as a compressed air-operated piston-cylinder unit, which is preferably double-acting, i.e. can be actively operated in two directions. The contact pressure with which the drive shaft 120 and/or the drive pulleys 121 can be applied to the material web 110 can be adjusted in particular with such a piston-cylinder unit.

The components of the device according to the invention described so far in connection with FIG. 1 are required for the unwinding operation of a first material web reel 110. In order to now be able to replace a nearly unwound 15 material web reel 110, the material web reel 110 must first be removed from the main winding station 105. An auxiliary or secondary winding station 130 is provided for this purpose. This secondary winding station comprises a second pair of pivot arms 131 and a third pair of pivot arms 132.

Of the third pivot arm pair 132, again only one pivot arm is visible, the first end of which is pivotably mounted in the machine frame 102, in particular in its support 104, by means of a third pivot bearing 133. The second end of the pivot arm 132 is formed and arranged to receive one end of the shaft 109. For a better overview, this shaft receptacle is again only shown as a depression or trough 134. In a specific embodiment, a shaft receptacle can be provided, for example a shaft lock, whereby it is first possible to pivot the pivot arm 132 to below the shaft 109. Subsequently, the shaft 109 can be lifted off the receptacle 108 of the main bearing point by means of the shaft receptacle and secured against relative movement to the pivot lever 132 by means of a securing device.

The third pivot arm 132 is pivoted by a third pivot drive 137. This pivot drive is articulated to the machine frame 102, in particular to the carrier 104. The pivot drive 137 is also articulated to the pivot arm 132. The pivot drive is preferably designed as a spindle-spindle nut combination, so that precise positioning of the pivot arm 132 is possible, which is advantageous for the takeover of the shaft 109. For this purpose, the pivot drive comprises a motor 138 which drives a spindle 139. The spindle 139 is screwed into a spindle nut 140, which is articulated to the pivot arm 132 but cannot be rotated relative to it. Thus, the rotation of the spindle nut causes a lateral movement of the spindle nut and consequently a pivot movement of the pivot arm. The arrangements of the spindle nut 140 and the motor 138 can also be interchanged.

For driving the shaft 109 and/or the material web winder 110, a second drive shaft 135 is provided in the pivot levers of the second pair of pivot arms 131, which can be driven rotationally by a drive not shown in FIG. 1. The second drive shaft 135 can be directly adjustable to the material web winder 110 or can carry drive pulleys 136 or other elements transmitting the drive force, which transmit the drive force from the drive shaft 135 to the outer circumference of the material web winder. The drive of the material web roll via the second drive shaft 135 just described is necessary when the first drive shaft 120 or the first drive pulleys 121 are no longer in contact with the material web reel 110.

A second pivot drive 141 is provided for the pivot movement of the second pair of pivot arms, of which, as already described, only the pivot arm 131 is visible. This pivot drive 141, which in turn is preferably designed as a piston cylinder unit operated by compressed air, is connected by its first end to the second pivot arm 131 in an articulated manner and by its second end to the third pivot arm 132 in an articulated manner. This means that when the third pivot drive 137 is actuated, the pivot arm 131 and at the same time the pivot arm 132 pivots relative to the machine frame. Relative to one another, the second pivot arm 131 and the third pivot arm 132 remain unchanged as long as the pivot drive 141 is not actuated. Overall, this arrangement ensures that the pressure force of the drive shaft 135 or the drive pulleys 136 on the material web roll can be kept constant in a simple manner even when the third pivot arm 132 is pivoted for the purpose of removing the material web roll from the main bearing point 107.

After the material web roll has reached a defined change diameter, the third pivot arm 132 is pivoted into a takeover position for taking over the shaft 109 together with the material web roll 110 up to the main bearing point 107. The second pivot drive 141 is then actuated so that the drive shaft 135 or the drive pulleys 136 are moved into drive contact with the outer surface of the material web roll 110 and can drive it. Shortly before, simultaneously or afterwards, the first pivot arm 122 is swung away by means of the pivot drive 124, so that the drive contact between the material web roll 110 and the drive shaft 120 or the drive pulleys 121 is interrupted. The pivot positions resulting from this sequence are shown in FIG. 2. Since no further features are shown in comparison to FIG. 1, the features described have not been provided with reference numbers again. These result directly and clearly from FIG. 1.

FIG. 3 now shows the situation after the pivot arm 132 has been pivoted away from the main bearing point 107 after the shaft 109 and the material web roll 110 have been taken over. The material web 101 continues to run off the material web roll 110. A new shaft 149, which carries a new material web roll 150, has been deposited on the main bearing point.

FIG. 4 shows that the material web 101 is now being unwound from the new material web roll 150. Previously, a connection step took place in which the beginning of the web, which was wound onto the new material web roll 150, was connected to the material web of the material web roll 110 and the old material web was then cut between the material web roll and the connection point of both material webs.

This connection step, which preferably takes place at full production speed, is not shown.

FIG. 4 also shows that the material web roll can be or is deposited on a removal station 160. For this purpose, the removal station 160 comprises two vertical elements 161, i.e. supports extending in direction y, of which only one vertical element 160 is visible. The vertical elements are supported on the machine frame 102. Each vertical element carries a roll track which is preferably inclined slightly with respect to the x-direction, wherein the end of the roll track 162 which faces the third pivot arm is raised with respect to the end of the roll track facing away from the third pivot arm. At this end facing away, each roll track comprises a stop element 163, with which the rolling movement of the shaft 109 can be stopped, so that the shaft then lies still and can be safely removed from the device 100.

To deposit the material web roll 110, the third pair of pivot arms 132 is pivoted further away from the main bearing point 107 until the journals of the shaft 109 rest on the roll tracks 162. The shaft 109 is then released from the shaft holder of the third pair of pivot arms 132, so that the shaft 109 is freely movable and can roll along the roll track.

When the shaft 109 is released with the rest of the material web roll 110, the state as shown in FIG. 1 is restored.

FIG. 5 shows a plan view of the device 100 in the operating state of FIG. 1. Starting from the axial center of the shaft 109, the radial direction spans a center plane 170, which is also the center plane in relation to at least one of the other shafts, in particular the drive shafts 120 and 135. A vertical line, which lies on this center plane and runs orthogonally to the axis of rotation of one of these drive shafts, is understood to be a central vertical.

Starting from the central plane 170 and looking to the right or left, i.e. in or against the direction z, the individual components have the arrangement according to the invention. In this view, it can be seen that the essential features of a device according to the invention are present twice and are generally arranged mirror-symmetrically to the central plane 170.

The pivot arms 131 of the second pair of pivot arms are arranged at the smallest distance from the center plane 170. The pivot arms 132 of the third pair of pivot arms are provided further outwards. It may be provided that the pivot arms 131 are located within the area bounded by the longitudinal members 104 and the pivot arms 132 are located outside the area bounded by the longitudinal members 104. A common axis 171 can be provided for both pivot arms, which runs through the respective longitudinal member 104 and on which the pivot arms 132 and 131 are pivotably supported via bearings and thus form the pivot bearings, of which the pivot bearing 133 is shown in FIG. 1.

The pivot arms 122 of the first pair of pivot arms are located even further outwards compared to the pair of pivot arms 132. These are preferably arranged further away from the central plane or central vertical than the pivot drives 137 of the pivot arms of the third pair of pivot arms 132.

Starting from the central vertical or the central plane 170, the components of the removal station 160 are arranged between the pivot arms 131 of the second pair of pivot arms and the pivot arms 122 of the first pair of pivot arms. The individual elements of the removal station 160 are provided with the reference numbers known from FIG. 1, but are not explained again here.

It is preferable to arrange the removal station 160 between the pivot arms 132 of the third pair of pivot arms and the pivot arms 122 of the first pair of pivot arms.

FIG. 6 now shows the view VI-VI from FIG. 5, i.e. a side view of a device according to the invention. The individual elements in this figure have the same reference numbers as in the previous figures.

This view again clearly shows the distance between the pivot arms of the individual pairs of pivot arms compared to the center plane 170.

Furthermore, it can be seen that in the vertical direction, i.e. seen in the direction y, the pivot arms 122 of the first pair of pivot arms have a greater extension than the pivot arms 132 of the third pair of pivot arms. In addition, seen in the direction y, they have a greater extension than the pivot arms 131 of the second pair of pivot arms.

Furthermore, it is advantageous if the pivot arms 132 of the third pair of pivot arms have a greater extension in the vertical direction, i.e. in the y direction, than the pivot arms 131 of the second pair of pivot arms.

In addition, compared to the previous figures, a drive motor 180 can be seen in FIG. 6, with which the drive shaft 120 can be set into a rotational movement. Thus, the drive motor drives the material web reel 110 via the drive shaft 120 and the drive pulleys 121, provided that the drive pulleys 121 are in frictional contact with the material web reel 110. The drive force of the motor 180 is preferably transmitted to the drive shaft 120 via a motor shaft 181 and an angular gear 182. The drive motor 180 and the angular gear 182 are arranged on one of the pivot arms 122 of the first pair of pivot arms. In order to prevent a different movement of the two pivot arms 122 under the influence of gravity due to the weight of the drive components arranged on this pivot arm 30 when the pivot arms are pivoted, the pivot arm 122, which does not carry the drive motor, is provided with a counterweight 183. In particular, this balancing weight has the same mass weight as the drive components mentioned above, which essentially comprise the drive motor, the motor shaft and the deflection gear. However, the counterbalance weight may also comprise the same drive components, in which case the drive shaft 120 would have its two ends driven. Instead of a counterbalance weight, it may also be provided that the pivot drives 124 act on the pivot arms 122 with different pivot forces, so that in this way the gravitational force acting differently on the pivot arms can be compensated.

The drive shaft 135 can be driven in the same way as the drive shaft 120. The drive motor 190, the motor shaft 191 and the deflection gear 192, which are arranged on one of the pivot arms 131 of the second pair of pivot arms, are available for this purpose. Their design, mode of operation, advantages and modifications correspond to those previously described in connection with the drive elements 180, 181 and 182. The same applies to the counterweight 193.

However, it can be seen that the size of the drive components 190, 191, 192 and the size of the counterweight are such that they are smaller than the free space between the respective adjacent pivot arms 131 and 132. In other words, the free space between these pivot arms is such that they are larger than the maximum space required by the largest of the drive components 180, 181, 182 when viewed in the z direction.