Device for unwinding a material web from one or more material web rolls

Abstract

The invention relates to a device for unwinding a material web from a plurality of material web rolls, said device comprising: a machine frame; a main bearing point, which is located on and in particular fastened to the machine frame, for rotatably supporting 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 placed directly or indirectly against the outer periphery of the first material web roll in order to transmit the drive force; a first pair of pivot arms, the pivot arms of which are pivotably mounted in the machine frame, wherein one end of the first drive shaft is rotatably mounted in each pivot arm; a secondary bearing point which is located on the machine frame and by means of which the shaft can be transferred from the main bearing point and / or is provided for supporting a second shaft for a second material web roll; a second drive shaft for rotationally driving a material web roll supported on the secondary bearing point, wherein the second drive shaft can be placed directly or indirectly against the outer periphery of the material web roll supported on the secondary bearing position in order to transmit the drive force; a second pair of pivot arms, the pivot arms of which are pivotably mounted in the machine frame, wherein one end of the second drive shaft is rotatably mounted in each pivot arm, wherein the pivot arms of the first pair of pivot arms are positioned further outwards in relation to the machine frame than the pivot arms of the second pair of pivot arms when viewed from the perpendicular bisector of the first and / or second drive shaft.

Description

[0001] Device for unwinding a material web from one or more

[0002] Material web rolls

[0003] The invention relates to a device for unwinding a material web from one or more material web rolls.

[0004] 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 can also be used. In the following, the invention is therefore generally described with reference to a material web. Both paper and plastic webs are often required in a machine for producing hoses that are later needed to form sacks and bags. The machine for producing hoses usually contains several of the devices mentioned above, since the hoses are often multi-layered. Such hoses can each comprise two paper layers enclosing a plastic layer. In this case, three of the devices mentioned above are required to unwind the material web.

[0005] To enable continuous unwinding of a material web, an additional roll of material web can be fed into the device. The beginning of this roll of material web must be connected to the end of the roll of material web currently being unwound. Furthermore, the first roll of material web must be removed from the unwinding station, and the additional roll of material web must be placed in the position of the first roll of material web at the winding station. After this change of material web roll, the additional roll of material web forms the first roll of material web, so that after a certain unwinding time, the change described above can take place again.

[0006] Such devices, which enable the continuous unwinding of a material web, especially from multiple rolls of material web, require a large amount of installation space. In applications where multiple devices are required within a single machine, a particularly large amount of space is therefore required.

[0007] The object of the present invention is therefore to propose a generic device which is compact in design and therefore space-saving.

[0008] The object is achieved by a device according to claim 1.

[0009] The device according to the invention for unwinding a material web from several material web rolls is

[0010] • with a machine frame,

[0011] • with a main bearing point arranged and in particular fastened to the machine frame for rotatably supporting a first shaft for a first material web roll, wherein the material web roll can be unwound,

[0012] • with a first drive shaft for rotating 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 for transmitting the drive force,

[0013] • with a first pair of swivel arms, the swivel arms of which are pivotally mounted in the machine frame, with one end of the first drive shaft being rotatably mounted in each swivel arm,

[0014] • with a secondary bearing point arranged on the machine frame, with which the shaft can be taken over from the main bearing point and / or is provided for supporting a second shaft for a second material web roll,

[0015] • with a second drive shaft for rotating a roll of material stored on the secondary bearing point, wherein the second drive shaft can be directly or indirectly adjusted to the outer circumference of the roll of material stored on the secondary bearing point for transmitting the drive force,

[0016] • equipped with a second pair of swivel arms, the swivel arms of which are pivotally mounted in the machine frame, one end of the second drive shaft being rotatably mounted in each swivel arm, the swivel arms of the first pair of swivel arms being arranged further outwards in relation to the machine frame than the swivel arms of the second pair of swivel arms, as seen from the mid-perpendicular of the first and / or second drive shaft.

[0017] In the device according to the invention, a machine frame is initially provided, which can be designed, in particular, as a frame. For example, a rectangular frame formed from tubes can serve as the basis for further features of the invention, which are described below. The features described below, i.e., functional elements of the invention, can be directly connected to the machine frame in a fixed or movable manner, or can be arranged indirectly on it via additional intermediate components.

[0018] A first shaft, which can also be referred to as a support shaft, is provided to support the first roll of material web. This shaft can be rotatably mounted in a main bearing point 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 to the machine frame, i.e., immovably arranged. For example, the main bearing point can comprise two support surfaces, which are preferably spaced apart from one another in the axial direction of the shaft, such that the shaft can be placed with its ends onto the support surfaces. In one embodiment, the support surfaces can be encompassed by a pair of supports, wherein the supports of the pair of supports are also spaced apart from one another. This arrangement just described makes it possible to unwind the material web from the material web roll.

[0019] To unwind the material web, the roll and / or the support shaft are generally driven. According to the invention, a drive shaft is provided for rotating the first material web roll, wherein the drive shaft is directly or indirectly adjustable to transmit the material web roll to its outer circumference. "Directly" means that the drive shaft itself is force-locked to the outer circumference of the material web roll. "Directly" means that the drive shaft carries at least one further element which is connected in a rotationally fixed manner to the drive shaft 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 gear.

[0020] In order to allow the drive shaft to continuously act on the outer circumference of the material web roll, even as its circumference reduces 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, the invention provides that each end of the drive shaft can be mounted in a respective pivot arm of a first pivot arm pair, wherein the pivot arm pairs are in turn pivotally 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 pivot arm pair is pivotable by means of a drive, wherein this drive can be designed as a piston-cylinder unit. Each of these piston-cylinder units is preferably also supported on the machine frame.

[0021] When the first roll of material is almost unwound, a roll change is necessary. To enable this, a secondary storage location is provided, which is arranged in or on the machine frame. Using the secondary storage location, the shaft and thus in particular the first roll of material can be removed from the main storage location. This removal is preferably carried out when the first roll of material is almost unwound, i.e. when, for example, 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 storage location can be provided with a lower load-bearing capacity than the main storage location, which means that the secondary storage location can be constructed cost-effectively. However, it can also be provided that a new roll of material web can be fed to the device by being deposited in the secondary storage location and kept 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 storage location so that the unwinding process can then be continued.

[0022] To drive the material web roll located on the secondary bearing, a second drive shaft is provided. This second drive shaft, in turn, acts on the outer circumference of the material web roll mounted on the secondary bearing and transmits the drive force to it. The second drive shaft can, in turn, apply the drive force to the material web roll directly, i.e., via direct contact, or indirectly via additional drive force-transmitting elements.

[0023] In order to be able to react to a decreasing diameter of the material web roll mounted on the secondary bearing point, a second pair of pivot arms is provided. One end of the second drive shaft is located in each pivot arm of this pair of pivot arms. The pivot arms are also pivotally 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 is preferably operated with compressed air, the pressing force of the drive shaft on the material web roll can be kept constant or essentially constant even as the circumference of the material web roll 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 perpendicular bisector of the first and / or the second drive shaft than the pivot arms of the second pair of pivot arms.In other words, the pivot arms of the first pivot arm pair are spaced a greater distance from the perpendicular bisector of the first and / or second drive shaft than the pivot arms of the second pivot arm pair. Instead of the perpendicular bisector of the first and / or second drive shaft, the center plane spanned by this perpendicular bisector can also be used as the reference plane for describing the invention. The same applies to the center plane of the machine frame, which will be explained later.

[0024] In the manner described, it is possible for the first and second drive shafts to bear against the first roll of material web at the same time, at least briefly, without collisions occurring in the area of ​​the pivot arms. Looking in the axial direction of the first support shaft, which supports the first roll of material web, it is thus possible to arrange both pairs of pivot arms on the right or left side of the vertical plane spanned 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 roll of material web and / or to feed in a new roll of material web, 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.

[0025] In a particularly preferred embodiment of the invention, the radial extent of the first pair of pivot arms is greater than the radial extent of the second pair of pivot arms. The radial extent of a pivot arm is the direct distance between a pivot bearing of the pivot arm, with which 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 thus greater for the pivot arms of the first pair of pivot arms than for the pivot arms of the second pair of pivot arms.

[0026] Thus, looking in the direction of the perpendicular bisector of the first and / or second drive shaft, a frame formed by the first pair of swivel arms and the first drive shaft encloses the frame formed by the second pair of swivel arms and the second drive shaft, preferably in any swivel position that each pair of swivel arms can assume relative to the machine frame. This ensures that the pairs of swivel arms and the associated drive shafts do not interfere with each other and, in particular, do not collide in any operating situation.

[0027] In a further advantageous embodiment of the invention, the auxiliary bearing point comprises a third pair of pivot arms, the pivot arms of which are pivotally mounted in the machine frame and, viewed from the perpendicular bisector, 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. Thus, the auxiliary bearing point is configured similarly to the first pair of pivot arms and / or the second pair of pivot arms. This means that the pivot arms of the auxiliary bearing point are also each connected to the machine frame at a first end via a pivot bearing, while the second ends are configured and adapted to support the ends of the shaft carrying the roll of material web.In this embodiment, it is advantageous that the pivot arms of the second pivot arm pair cannot collide with the pivot arms of the secondary bearing point, since the pivot arms of the second pivot arm pair are arranged further “inward”. This means that the pivot bearings of the two aforementioned pivot arm pairs can be arranged very close to one another, which contributes to the compact design of the device according to the invention. The pivoting movement of the pivot arms of the third pivot arm pair can preferably be brought about 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 respective pivot arm to pivot.The spindle nut is in particular pivotably mounted on the pivot arm, whereas the spindle drive motor is in particular pivotably mounted on the machine frame.

[0028] It is advantageous to provide a fourth pair of pivot arms, in whose pivot arms the ends of a cutting device, in particular a cutting bar, are mounted. This cutting device serves to sever the first material web when the beginning 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 inward with respect to the machine frame, as viewed from the perpendicular bisector of the first and / or second drive shaft, than the main bearing point and / or pivot arms of the first pair of pivot arms.

[0029] Advantageously, a force-supplying device is provided, with which a force can be applied to the second pivot arm, wherein the force-supplying device is supported on the third pivot arm. Because the force-supplying device is supported on both pivot arms, a pivoting movement of the second pivot arm relative to the machine frame can occur without the pivot position of the third pivot arm having to be adjusted. The second pivot arm and the third pivot arm can thus be regarded as a movement unit relative to the machine frame. The force-supplying device can in turn be a spindle-spindle nut combination or a piston-cylinder unit. In the latter case, it can preferably be operated with compressed air. On the one hand, the contact force is adjustable, and on the other hand, a tolerance is provided for concentricity inaccuracy.The force-providing device is preferably pivotably mounted on the second and third pivot arms. It is even advantageous if the pivot bearings of the second pivot arm pair and the pivot bearings of the third pivot arm pair are aligned. In this case, the device has a particularly compact and simple design. Axles can be provided in the machine frame, on which one pivot arm of the second pivot arm pair and one pivot arm of the third pivot arm pair are supported via pivot bearings.

[0030] Furthermore, it is advantageous if the radial extension of the pivot arms of the third pivot arm pair is smaller than the radial extension of the pivot arms of the first pivot arm pair and / or is greater than or equal to the radial extension of the pivot arms of the second pivot arm pair. The radial extension is to be understood with respect to the pivot arms of the third pivot arm pair in the same way as it was described above with respect to the first and second pivot arm pairs. In particular, this embodiment means that the frame formed by the first pivot arm pair and the first drive shaft also encloses the frame formed by the third pivot arm pair and the shaft supporting the material web roll. This, in turn, allows for a compact design of the device according to the invention.

[0031] In a further embodiment of the invention, it can be particularly advantageous if the radial extent of the pivot arms of the third pivot arm pair is the same as the radial extent of the pivot arms of the second pivot arm pair. In this embodiment, the second drive shaft can be pivoted onto the material web roll and pressed against the material web roll with a pressing force, wherein the force vector of the pressing force runs essentially in a direction defined by a connecting line between the second drive shaft and the shaft which supports the material web roll in the secondary bearing point. The pressing force runs exactly in the described direction in particular when the axes of the pivot bearings of the second and third pivot arm pairs are aligned with one another. The described direction of the pressing force is maintained even if the diameter of the material web roll decreases as a result of unwinding.

[0032] In an advantageous embodiment of the invention, at least one pivot arm of the first and / or second pivot arm pair each comprises a drive for rotating the drive shaft. The drive is preferably 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 such that its rotor runs at least partially parallel to the extent 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 in the circumferential direction of the drive shaft.Overall, this arrangement of the drive means that the electric motor requires little installation space in the axial direction of the drive shaft, whereby the device according to the invention is of compact design.

[0033] It is advantageous to connect a rotor shaft of the drive to the drive shaft via a torque-transmitting reversing gear. A reversing gear results in a particularly space-saving design, particularly in conjunction with an at least partially parallel arrangement of the rotor shaft to the extension of the respective pivot arm.

[0034] In an advantageous embodiment of the invention, it is provided that the first pivot arm of the first and / or second pivot arm pair carries a drive motor for driving the first and / or second drive shaft, wherein the second pivot arm of the first and / or second pivot arm pair carries a compensating device for compensating the weight of the drive motor. This aspect of the invention can also represent an independent invention. It is advantageous that the weight force acting on the respective pivot arm due to the motor also acts - at least partially - on the second pivot arm. This avoids a varying pressure force over the axial length of the drive shaft, which could otherwise lead to uneven unwinding of the material web or even damage to the material web roll.

[0035] Furthermore, it is advantageous if at least one pivot arm of the second pivot arm pair carries a drive for rotating the second drive shaft, wherein the pivot arm of the first pivot arm pair, which, viewed from the perpendicular bisector, is arranged on the same side as the pivot arm of the second pivot arm pair carrying the drive, is arranged at a distance from the pivot arm carrying the drive that is greater than the installation depth of the drive. In other words, it is provided that said pivot arm of the first pivot arm pair is far enough away from the pivot arm of the second pivot arm pair carrying the drive that both pivot arms can be moved past each other without a collision occurring between said pivot arm of the first pivot arm pair and the drive motor.This ensures that the first pair of swivel arms and the second pair of swivel arms do not collide, even if one of the swivel arms of the second pair of swivel arms carries the drive.

[0036] In a further advantageous embodiment, a pivot arm of the first pivot arm pair, in particular the pivot arm of the first pivot arm pair which, viewed from the perpendicular bisector, is arranged on the same side as the pivot arm of the second pivot arm pair carrying the drive, carries a drive. The drives of both drive shafts are therefore located on one side of the device, which improves accessibility to the drives. It is advantageous if the drive is arranged on the side of the first pivot arm facing away from the second pivot arm pair, so that both pivot arms can be arranged close to one another, which further improves the compact design of the entire device. Further advantages, features and details of the invention will become apparent from the following description, in which various exemplary 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 mentioned features. Within the scope of the entire disclosure, features and details 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 with regard to the disclosure, reference is always made to the individual aspects of the invention. The individual figures show:

[0037] Fig. 1 Side view of a device according to the invention in

[0038] Unwinding operation

[0039] Fig. 2 Side view as in Figure 1 , but with the secondary bearing pivoted towards the main bearing point

[0040] Fig. 3 Side view as in Figure 2, but with material web roll removed from the main storage location by the secondary storage location

[0041] Fig. 4 Side view as in Figure 3, but with the first material web roll laid down and the material web unwinding from the second material web roll

[0042] Fig. 5 Top view of a device according to the invention

[0043] Fig. 6 View VI - VI from Figure 1 .

[0044] Figure 1 shows a device 100 according to the invention for unwinding a material web 101 in unwinding operation.

[0045] The device 100 primarily comprises a machine frame 102, which comprises a plurality of components, most of which are not specified in more detail. The machine frame 102 comprises a base frame 103 and a longitudinal beam 104 extending in the x direction, 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 Y direction, and a support element 107 with a receptacle 108 for a shaft 109, wherein the vertical support and the support element can be designed as a single unit. The receptacle for the shaft is shown in Figure 1 as a simple recess, but the structure is more complex; this is not shown for the sake of clarity.

[0046] The shaft 109 carries a first material web reel 110, onto which the material web 101 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 a representative, and is fed, for example, to a tube forming station.

[0047] Since the material web roll 110 is generally very heavy and the material web is not sufficiently tear-resistant, the material web roll cannot be moved by the tensile force exerted on the material web. Therefore, a drive force is provided for rotational drive on the material web roll 110. In the illustrated embodiment, this drive force is transmitted to the circumferential surface of the roll 110. For this purpose, a first drive shaft 120 can be provided, which can be driven in rotation and, for example, rests against the circumferential surface of the roll 110. However, it is also possible for the first drive shaft to carry two or more first drive disks 121, which transmit the drive force to the circumferential surface of the material web roll 110.

[0048] The drive force is provided by a first drive motor 180, which is explained in more detail below in connection with Figure 6. The first drive shaft 120 is rotatably mounted in a first pair of pivot arms, wherein the pivot arm 122 of the first pair of pivot arms is visible in Figure 1. The pivot arm 122 is pivotally mounted in the longitudinal support 104 via a pivot bearing 123. A first pivot drive 124 is provided for pivoting the pivot arm 122. The first end of the pivot drive is supported in an articulated manner on the machine frame 10, in particular on its support 104, via a first pivot bearing 125. The pivot arm 122 is articulatedly connected to the pivot drive 124 via a second pivot 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.With such a piston-cylinder unit, in particular the contact pressure with which the drive shaft 120 and / or the drive disks 121 can be adjusted to the material web roll 110 can be adjusted.

[0049] The components of the device according to the invention described so far in connection with Figure 1 are required for the unwinding operation of a first material web roll 110. In order to replace a nearly unwound material web roll 110, the material web roll 110 must first be removed from the main winding station 105. For this purpose, an auxiliary or secondary winding station 130 is provided. This secondary winding station comprises a second pair of pivot arms 131 and a third pair of pivot arms 132.

[0050] Of the third pivot arm pair 132, only one pivot arm is visible, the first end of which is pivotally 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 designed and configured to receive one end of the shaft 109. For clarity, this shaft receptacle is again shown only as a recess or trough 134. In a specific embodiment, a shaft receptacle can be provided, for example a shaft lock, whereby pivoting of the pivot lever 132 is initially possible until below the shaft 109. Subsequently, the shaft 109 can be lifted from the receptacle 108 of the main bearing point using the shaft receptacle and secured against relative movement to the pivot lever 132 using a securing device. The pivoting of the third pivot arm 132 is achieved by a third pivot drive 137.This swivel drive is pivotally connected to the machine frame 102, in particular to the support 104. The swivel drive 137 is also pivotally connected to the swivel arm 132. The swivel drive is preferably designed as a spindle-spindle nut combination, allowing precise positioning of the swivel arm 132, which is advantageous for the transfer of the shaft 109. For this purpose, the swivel drive comprises a motor 138 that drives a spindle 139. The spindle 139 is screwed into a spindle nut 140, which is pivotally mounted on the swivel 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 pivoting movement of the swivel arm. The arrangements of the spindle nut 140 and the motor 138 can also be interchanged.

[0051] To drive the shaft 109 and / or the material web roll 110, a second drive shaft 135 is provided in the pivot levers of the second pivot arm pair 131. This second drive shaft 135 can be rotatably driven by a drive not shown in Figure 1. The second drive shaft 135 can be directly engageable with the material web roll 110 or can carry drive pulleys 136 or other drive force-transmitting elements that transmit the drive force from the drive shaft 135 to the outer circumference of the material web roll. The just-described drive of the material web roll via the second drive shaft 135 is necessary when the first drive shaft 120 or the first drive pulleys 121 are no longer in contact with the material web roll 110.

[0052] A second pivot drive 141 is provided for the pivoting movement of the second pivot arm pair, of which, as already described, only pivot arm 131 is visible. This pivot drive 141, which in turn is preferably designed as a compressed air-operated piston-cylinder unit, is pivotally connected at its first end to the second pivot arm 131 and at its second end to the third pivot arm 132. Thus, upon actuation of the third pivot drive 137, the pivot arm 131 and simultaneously the pivot arm 132 are pivoted 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 even when pivoting the third pivot arm 132 for the purpose of removing the material web roll from the main bearing point 107, the pressing force of the drive shaft 135 or the drive disks 136 on the material web roll can be maintained constant in a simple manner.

[0053] Once the material web roll has reached a specified change diameter, the third pivot arm 132 is pivoted into a takeover position to take 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 disks 136 come into driving contact with the outer surface of the material web roll 110 and can drive it. Shortly before, simultaneously, or subsequently, the first pivot arm 122 is pivoted by means of the pivot drive 124 so that the driving contact between the material web roll 110 and the drive shaft 120 or the drive disks 121 is interrupted. The pivot positions resulting from this process are shown in Figure 2. Since no further features are shown compared to Figure 1, the described features have not been provided with reference numerals again.These are immediately and clearly evident from Figure 1 .

[0054] Figure 3 now shows the situation after the pivot arm 132 has been pivoted away from the main storage location 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, carrying a new material web roll 150, has been deposited on the main storage location.

[0055] Figure 4 shows that the material web 101 is now being unwound from the new material web roll 150. Prior to this, a joining step took place in which the beginning of the material web wound on the new material web roll 150 was joined to the material web on the material web roll 110, and in which the old material web was subsequently severed between the material web roll and the joining point of the two material webs. This joining step, which preferably takes place at full production speed, is not shown.

[0056] Figure 4 further shows that the material web roll can be or is deposited on a removal station 160. The removal station 160 comprises two vertical elements 161, i.e. supports extending in the y direction, of which only one vertical element 160 is visible. The vertical elements are supported on the machine frame 102. Each vertical element carries a roller track, which is preferably slightly inclined relative to the x direction, wherein the end of the roller track 162 facing the third pivot arm is raised compared to the end of the roller track facing away from the third pivot arm. At this remote end, each roller track comprises a stop element 163, with which the rolling movement of the shaft 109 can be stopped, so that the shaft subsequently lies still and can be safely removed from the device 100.

[0057] To deposit the material web roll 110, the third pair of swivel arms 132 is pivoted further away from the main bearing point 107 until the journals of the shaft 109 rest on the roller tracks 162. The shaft 109 is then released from the shaft mount of the third pair of swivel arms 132, so that the shaft 109 is freely movable and can roll along the roller track.

[0058] When the shaft 109 with the rest of the material web roll 110 is released, the state is restored as shown in Figure 1.

[0059] Figure 5 shows a plan view of the device 100 in the operating state of Figure 1. Starting from the axial center of the shaft 109, the radial direction spans a center plane 170, which simultaneously also forms the center plane with respect to at least one of the other shafts, in particular the drive shafts 120 and 135. A vertical line lying on this center plane and running orthogonal to the axis of rotation of one of these drive shafts is to be understood as the perpendicular bisector. Starting from the center plane 170, 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 center plane 170.

[0060] The pivot arms 131 of the second pivot arm pair are arranged at the shortest distance from the center plane 170. The pivot arms 132 of the third pivot arm pair are provided further out. Provision can be made for the pivot arms 131 to be located within the area delimited by the longitudinal members 104, and for the pivot arms 132 to be located outside the area delimited by the longitudinal members 104. A common axis 171 can be provided for both pivot arms, which extends through the respective longitudinal member 104 and on which the pivot arms 132 and 131 are pivotably supported via bearings, thus forming the pivot bearings, of which the pivot bearing 133 is shown in Figure 1.

[0061] The pivot arms 122 of the first pivot arm pair are positioned even further outward than the pivot arm pair 132. These are preferably arranged farther away from the center plane or mid-perpendicular than the pivot drives 137 of the pivot arms of the third pivot arm pair 132.

[0062] Starting from the perpendicular bisector or center plane 170, the components of the removal station 160 are arranged between the pivot arms 131 of the second pivot arm pair and the pivot arms 122 of the first pivot arm pair. The individual elements of the removal station 160 are provided with the reference numerals known from Figure 1, but will not be explained again here.

[0063] Preferably, the removal station 160 is arranged between the pivot arms 132 of the third pivot arm pair and the pivot arms 122 of the first pivot arm pair. Figure 6 shows the view VI-VI from Figure 5, i.e., a side view of a device according to the invention. The individual elements in this figure bear the same reference numerals as in the preceding figures.

[0064] In this view, the distance between the swivel arms of the individual swivel arm pairs is once again clear in comparison to the center plane 170.

[0065] Furthermore, it can be seen that, viewed in the vertical direction, i.e., in the y direction, the pivot arms 122 of the first pivot arm pair have a greater extension than the pivot arms 132 of the third pivot arm pair. Furthermore, viewed in the y direction, they have a greater extension than the pivot arms 131 of the second pivot arm pair.

[0066] Furthermore, it is advantageous if, viewed in the vertical direction, i.e. in the direction y, the pivot arms 132 of the third pivot arm pair have a greater extension than the pivot arms 131 of the second pivot arm pair.

[0067] In addition, compared to the previous figures, Figure 6 shows a drive motor 180, with which the drive shaft 120 can be set in a rotational movement. Thus, the drive motor drives the material web roll 110 via the drive shaft 120 and the drive pulleys 121, provided the drive pulleys 121 are in frictional contact with the material web roll 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 pivot arm pair. In order to prevent a different movement of the two pivot arms 122 under the influence of gravity when pivoting the pivot arms due to the weight of the drive components arranged on this pivot arm, a counterweight 183 is provided on the pivot arm 122, which does not carry the drive motor.This counterweight, in particular, has the same mass as the aforementioned drive components, which essentially comprise the drive motor, the motor shaft, and the deflection gear. However, the counterweight can also comprise the same drive components, in which case the drive shaft 120 would be driven at both ends. Instead of a counterweight, it can also be provided that the pivot drives 124 act on the pivot arms 122 with different pivoting forces, thus compensating for the different gravity forces acting on the pivot arms.

[0068] The drive shaft 135 can be driven in the same way as the drive shaft 120. For this purpose, the drive motor 190, the motor shaft 191, and the deflection gear 192 are available, which are arranged on one of the pivot arms 131 of the second pivot arm pair. Their structure, 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.

[0069] However, it can be seen that the size of the drive components 190, 191, 192 as well as the size of the counterweight are dimensioned such that they are smaller than the free space between the adjacent pivot arms 131 and 132. In other words, the free space between these pivot arms is dimensioned such that they are larger than the maximum space requirement of the largest of the drive components 180, 181, 182 seen in the z direction.

[0070]

Claims

Patent claims Device for unwinding a material web from several material web rolls • with a machine frame • with a main bearing point arranged and in particular fastened to the machine frame for rotatably supporting a first shaft for a first material web roll, wherein the material web roll can be unwound, • with a first drive shaft for rotating 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 for transmitting the drive force, • with a first pair of swivel arms, the swivel arms of which are pivotally mounted in the machine frame, with one end of the first drive shaft being rotatably mounted in each swivel arm, • with a secondary bearing point arranged on the machine frame, with which the shaft can be taken over from the main bearing point and / or is provided for supporting a second shaft for a second material web roll, • with a second drive shaft for rotating a material web roll mounted on the secondary bearing point, wherein the second drive shaft is connected to the outer circumference of the material web roll mounted on the secondary bearing point for transmitting the drive force directly or indirectly. can be hired in cash, • with a second pair of swivel arms, the swivel arms of which are pivotally mounted in the machine frame, with one end of the second drive shaft being rotatably mounted in each swivel arm, • wherein the pivot arms of the first pivot arm pair are arranged further outwards in relation to the machine frame than the pivot arms of the second pivot arm pair, as viewed from the perpendicular bisector of the first and / or second drive shaft. Device according to claim 1, characterized in that the radial extent of the first pivot arm pair is greater than the radial extent of the second pivot arm pair. Device according to one of the preceding claims, characterized in that the auxiliary bearing point comprises a third pivot arm pair, the pivot arms of which are pivotally mounted in the machine frame and are arranged further outwards from the perpendicular bisector than the pivot arms of the second pivot arm pair and in particular are arranged further inwards than the pivot arms of the first pivot arm pair.Device according to one of the preceding claims, characterized in that the radial extent of the pivot arms of the third pivot arm pair is smaller than the radial extent of the pivot arms of the first pivot arm pair and / or is greater than or equal to the radial extent of the pivot arms of the second pivot arm pair. Device according to one of the preceding claims, characterized in that a force-providing device is provided with which a force can be applied to the second pivot arm, wherein the force-providing device. device is supported / attached to the third pivot arm. Device according to one of the preceding claims, characterized in that at least one pivot arm of the first and / or second pivot arm pair comprises a drive for rotating the drive shaft. Device according to one of the preceding claims, characterized in that at least one pivot arm of the second pivot arm pair carries a drive for rotating the second drive shaft, wherein the pivot arm of the first pivot arm pair, which, viewed from the perpendicular bisector, is arranged on the same side as the pivot arm of the second pivot arm pair carrying the drive, is arranged at a distance from the pivot arm carrying the drive that is greater than the structural depth of the drive.Device according to one of the preceding claims, characterized in that a pivot arm of the first pivot arm pair, in particular the pivot arm of the first pivot arm pair which, viewed from the perpendicular bisector, is arranged on the same side as the pivot arm of the second pivot arm pair carrying the drive, carries a drive. Device according to one of the preceding claims, characterized in that a rotor shaft of the drive is connected to the drive shaft in a torque-transmitting manner by means of a deflection gear. Device according to one of the preceding claims, characterized in that the first pivot arm of the first and / or second pivot arm pair has a drive motor for driving the first and / or the second drive. shaft, wherein the second pivot arm of the first and / or second pivot arm pair carries a compensating device for compensating the weight of the drive motor. Device according to one of the preceding patent claims, characterized in that the compensating device comprises a monolithic element, in particular a block comprising at least one metal. Device according to one of the preceding patent claims, characterized in that the compensating device comprises a second drive motor, which is in particular identical to the first drive motor. Device according to one of the preceding patent claims, characterized in that the compensating device comprises a force supply device with which a force can be applied to the second pivot arm, wherein the force supply device is supported in particular on the machine frame.

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