Device for unwinding a material web from a plurality of material web rolls

Abstract

The invention describes a device for unwinding a material web from a plurality of material web rolls having a machine frame, with a main bearing point attached to the machine frame for rotatably bearing the shaft of a first material web roll, wherein the material web roll can be unwound, having a first pair of pivot arms, the first ends of which are pivotably mounted in the machine frame by means of first pivot bearings and the second ends of which carry a first drive shaft for rotationally driving the first material web roll, wherein the first drive shaft acts on the outer circumference of the material web roll, having a second pair of pivot arms, the first ends of which are pivotably mounted with second pivot bearings in the machine frame and the second ends of which are configured to take over the shaft of the first material web roll and / or to support the shaft of a second material web roll, having a third pair of pivot arms, the first ends of which are pivotably mounted with third pivot bearings in the machine frame and the second ends of which carry a second drive shaft for rotationally driving the material web roll, which is located on the shaft carried by the second ends of the second pair of pivot arms, wherein the second drive shaft acts on the outer circumference of the material web roll and wherein the verticals of the first pivot bearing, the second pivot bearing and the third pivot bearing are arranged in an arrangement area between the vertical of the main bearing point and the vertical of the second drive shaft when the latter occupies the maximum intended horizontal distance from the vertical of the main bearing point, or which lies between the vertical of the main bearing point and the vertical of the line of the surface of the second drive shaft which is furthest away from the vertical of the main bearing point when the latter occupies the maximum intended horizontal distance from the vertical of the main bearing position.

Description

[0001] Device for unwinding a material web from several

[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, another material web roll can be fed into the device. The beginning of this material web must be connected to the end of the material web roll that is currently being unwound. Furthermore, the first material web roll must be removed from the unwinding station, which is also referred to below as the main storage station, and the additional material web roll must be placed in the position of the first material web roll at the unwinding station. After this change of material web roll, the additional material web roll forms the first material web roll, so that after a certain unwinding time, the described change can take place again. The previously first material web roll then forms the second material web roll.

[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 thus space-saving.

[0008] According to the invention, this object is achieved by all features of claim 1. Possible embodiments of the invention are specified in the dependent claims.

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

[0010] • with a machine frame,

[0011] • with a main bearing point attached to the machine frame for rotatably supporting the shaft of a first material web roll, wherein the material web roll can be unwound

[0012] • with a first pair of swivel arms, the first ends of which are pivotally mounted in the machine frame by means of first pivot bearings and the second ends of which are adapted to receive the shaft of the first material web roll and / or to support the shaft of a second material web roll,

[0013] • with a second pair of swivel arms, the first ends of which are pivotally mounted in the machine frame by means of second pivot bearings and the second ends of which carry a first drive shaft for rotating the first material web roll, wherein the first drive shaft acts on the outer circumference of the material web roll

[0014] • with a third pair of swivel arms, the first ends of which are pivotally mounted in the machine frame by means of third pivot bearings and the second ends of which carry a second drive shaft for rotating the material web roll, which second drive shaft is located on the shaft carried by the second ends of the first pair of swivel arms, the second drive shaft acting on the outer circumference of the material web roll

[0015] • with a storage device on which the shaft of the first and / or the second material web roll can be placed at a storage point, wherein the verticals of the first pivot bearing, the second pivot bearing and the third pivot bearing are arranged in an arrangement area which lies between the vertical of the main bearing point and the vertical of the second drive shaft when the latter occupies the maximum intended horizontal distance from the vertical of the main bearing point.

[0016] In an alternative of the invention, the verticals of the first pivot bearings, the second pivot bearings and the third pivot bearings are arranged in an arrangement area which lies between the vertical of the main bearing point and the vertical of the line of the surface of the second drive shaft which is furthest away from the vertical of the main bearing point when the latter occupies the maximum intended horizontal distance from the vertical of the main bearing point.

[0017] In the device according to the invention, a machine frame is initially provided, which can in particular be designed as a frame. For example, a rectangular frame made of 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. The frame lies in a plane referred to as the horizontal. As a rule, this horizontal is the same as the horizontal relative to the force normal of the earth's gravitational force. The horizontal is therefore arranged perpendicular to the force normal.

[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 the main bearing point, which is arranged on or in the machine frame, for unwinding. Preferably, the main bearing point or some of its components are fixed, i.e., immovably mounted, on the machine frame. 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.The line or plane that is orthogonal to the horizontal and passes through the shaft stored in the main bearing point is hereinafter referred to as the vertical of the main bearing point.

[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-fittingly adjustable to the outer circumference of the material web roll. "Indirectly" 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 decreases over time, the drive shaft must be movable relative to the material web roll and thus relative to the main bearing point. To this end, the invention provides that each end of the drive shaft can be mounted in a respective pivot arm of a first pivot arm pair, the first ends of which are pivotally mounted in the machine frame by first pivot bearings, and the second ends of which are configured to receive the shaft of the first material web roll and / or to support the shaft of a second material web roll.

[0021] In particular, one end of the drive shaft is mounted in or on one end of each pivot arm, while the second end of each pivot arm is rotatably connected to the machine frame. The line or plane that is arranged orthogonal to the horizontal and runs through the first pivot bearings is referred to below as the vertical of the first pivot bearings. Preferably, each of these pivot arms of the first pivot arm pair is pivotable by means of a first pivot drive, wherein this pivot drive can be designed as a piston-cylinder unit. Each of these piston-cylinder units is preferably also supported on the machine frame, wherein this is preferably done via fifth pivot bearings. The line or plane that is arranged orthogonal to the horizontal and runs through the fifth pivot bearings is referred to below as the vertical of the fifth pivot bearings.

[0022] When the first roll of material web 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. This secondary storage location comprises a second pair of pivot arms, the first ends of which are pivotally mounted in the machine frame by means of second pivot bearings and the second ends of which are designed to receive the shaft of the first roll of material web and / or to support the shaft of a second roll of material web. Using the secondary storage location, the shaft and thus in particular the first roll of material web can be removed from the main storage location. This removal is preferably carried out when the first roll of material web is almost unwound, i.e. when, for example, 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 more 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. After the material web has been unwound from the first roll of material web, the new second roll of material web can then be fed to the main storage location, so that the unwinding process can then be continued. The line or plane that is orthogonal to the horizontal and runs through the second pivot bearings is referred to below as the vertical of the second pivot bearings.

[0023] 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. The line or plane that is orthogonal to the horizontal and runs through the second drive shaft is referred to below as the vertical of the second drive shaft.

[0024] In order to be able to react to a decreasing diameter of the material web roll mounted on the secondary bearing point, a third pair of pivot arms is provided. The pivot arms are pivotally mounted in the machine frame using third pivot bearings. One end of the second drive shaft can be mounted in each pivot arm of this pivot arm pair. The line or plane that is arranged orthogonal to the horizontal and runs through the second pivot bearings is referred to below as the vertical of the second pivot bearings. Preferably, the pivot arms of the second pivot arm pair are also pivoted by actuators, which can be designed as piston-cylinder units. Using a piston-cylinder unit, which is preferably operated with compressed air, the pressing force of the drive shaft against 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 verticals of the first pivot bearings, the second pivot bearings and the third pivot bearings are arranged in an arrangement area which lies between the vertical of the main bearing point and the vertical of the second drive shaft when the latter occupies the maximum intended horizontal distance from the vertical of the main bearing point, or between the vertical of the main bearing point and the vertical of the line of the surface of the second drive shaft which is furthest away from the vertical of the main bearing point, when the latter occupies the maximum intended horizontal distance from the vertical of the main bearing point.

[0025] This arrangement makes it possible to construct the entire device for unwinding a material web with the smallest possible space requirement in the transport direction of the material web. A short installation length is particularly important in this transport direction, given the number of similar devices that must be provided when producing a multi-layer tube for bags and sacks.

[0026] In a preferred embodiment of the invention, it is provided that the second pivot bearings and / or the third pivot bearings are arranged closer to the vertical of the main bearing point than the first pivot bearings. In this case, the verticals of the said pivot bearings are decisive with regard to the term “closer”. This means that the pivot bearings for the first drive shaft are furthest away from the main bearing point compared to the other mentioned pivot bearings. It is further preferred that, with regard to the perpendicular bisector of the shaft on which the first material web roll can be mounted, the pivot arms of the first pivot arm pair are arranged further away than the pivot arms of the second and third pivot arm pairs. In this case, it is possible for the first pivot arms to be movable past the other pivot arms.Overall, the first pair of swivel arms can be movable over a larger swivel range, within which the first drive shaft can effectively drive the first roll of material web. To achieve an even shorter design of the aforementioned device, it is further advantageous if the swivel bearings of the second and third pair of swivel arms are aligned with each other. At the very least, however, the verticals of the second and third swivel bearings can be arranged on a common plane.

[0027] In a further embodiment of the invention, a storage device is provided on which the shaft of the first and / or the second material web roll can be placed at a storage point. In particular, the storage device comprises vertical supports for supporting rails on which the shaft of the material web roll can roll, wherein the vertical supports are arranged further away from the vertical of the main bearing point than the vertical of the first pivot bearings. This means, in particular in the case that the vertical of the first pivot bearings is further away from the vertical of the main bearing point than the vertical of the second and / or the vertical of the third pivot bearings, that all pivot bearings are arranged between the vertical of the main bearing point and the vertical of the storage device, whereby the structural length of the device can be shortened even further.

[0028] In a further advantageous embodiment of the invention, the first pair of pivot arms and / or the second pair of pivot arms and / or the third pair of pivot arms are each pivotable by means of at least one pivot arm drive, wherein at least one of the pivot arm drives is pivotably mounted on a pivot arm with its first end and rotatably mounted in the machine frame via a pivot bearing with its second end, wherein the vertical axis of the pivot bearing is arranged in the arrangement area. Thus, the pivot bearings of the device do not require any additional installation space, so that the device has a space-saving design.

[0029] Furthermore, it is advantageous to provide a fourth pair of pivot arms, the first ends of which are pivotally mounted in the machine frame by means of fourth pivot bearings, and the second ends of which support a feed roller and / or a separating knife, with the verticals of the fourth pivot bearings being arranged in the arrangement area. Thus, even when providing an additional pair of pivot arms, the installation space remains limited, so that despite additional functional elements, the arrangement area does not need to be enlarged, thus allowing the installation space to remain small.

[0030] In an advantageous further development, the verticals of the fourth pivot bearings are arranged closer to the vertical of the main bearing point than the verticals of the first, the second and / or the third pivot bearings.

[0031] Further advantages, features, and details of the invention will become apparent from 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 each be essential to the invention individually or in any combination of mentioned features. The individual figures show:

[0032] Fig. 1 Side view of a device according to the invention in

[0033] Unwinding operation

[0034] Fig. 2 View as in Figure 1 , but with the material web roll removed from the main storage location and a new material web roll inserted

[0035] Fig. 3 View as in Figure 2, where the material web is unwound from the new material web roll and the old winding shaft is discarded.

[0036] Figure 1 shows a device 100 according to the invention for unwinding a material web 101 in unwinding operation.

[0037] The device 100 comprises a machine frame 102, which includes a plurality of components, most of which are not specified in 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. The x-direction forms a horizontal line, so that the base frame 103 and the longitudinal beam, in particular, represent the horizontal direction.

[0038] 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; however, the structure is more complex, which is not shown for clarity. The vertical 200, shown in dash-dotted lines, runs through the shaft 109 and is aligned orthogonally to the horizontal.

[0039] 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.

[0040] 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 for rotational drive acts on the material web roll 110, which in the illustrated embodiment 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.

[0041] The first drive shaft 120 is rotatably mounted in a first pair of pivot arms, of which only the front pivot arm 122 is visible in Figure 1. The first end of the pivot arm 122 is pivotally mounted in the machine frame, in particular in the longitudinal beam 104, via a first pivot bearing 123. The vertical line 201, shown in dash-dotted lines, runs through the pivot bearing 123 and is oriented orthogonally to the horizontal.

[0042] A first pivot drive 124 is provided for pivoting the pivot arm 122. Its first end is supported in an articulated manner on the machine frame 102, in particular on its longitudinal beam 104, via a fifth pivot bearing 125. The vertical 207, shown in dash-dotted lines, runs through the shaft 109 and is aligned orthogonally to the horizontal. The pivot arm 122 is articulated 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 pulleys 121 can be adjusted against the material web roll 110 can be adjusted.

[0043] 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.

[0044] Of the second pivot arm pair 131, only the front pivot arm is visible. The first ends of the pivot arms are pivotally mounted in the machine frame 102, in particular in its longitudinal beam 104, by means of second pivot bearings 133. The vertical 202 again runs orthogonally to the horizontal and through the second pivot bearing 133. The second ends of the pivot arms 131 are designed and configured to each receive one end of the shaft 109. For better clarity, this shaft receptacle is again shown only as a depression or trough 134. In a specific embodiment, a shaft receptacle can be provided, for example a shaft lock, whereby pivoting of the pivot arm pair 131 is initially enabled to below the shaft 109. The shaft 109 can then be lifted from the receptacle 108 of the main bearing point using the shaft receptacle and secured against relative movement to the pivot lever 131 using a securing device.

[0045] The pivoting of the second pivot arm 131 is achieved by a second pivot drive 137. This pivot drive is pivotally connected to the machine frame 102, in particular to the support 104, via a fourth pivot bearing 145. The vertical 203, shown in dash-dotted lines, runs through the pivot bearing 145 and is again aligned orthogonally to the horizontal.

[0046] The pivot drive 137 is also pivotally connected to the pivot arm 131. The pivot drive is preferably designed as a spindle-spindle nut combination, allowing precise positioning of the pivot arm 131, which is advantageous for the transfer of the shaft 109. For this purpose, the pivot 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 pivot arm 131 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 pivot arm. The arrangements of the spindle nut 140 and the motor 138 can also be interchanged.

[0047] 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 third pivot arm pair 132, which can be driven in rotation 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, which 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.

[0048] Each pivot arm 132 of the third pivot arm pair is pivotably mounted at one of its ends via a third pivot bearing on the machine frame 102. In the present embodiment, the respective end is mounted behind the support 104, so that it is not visible in Figure 1. The orthogonal line 204 is also not visible, as it is concealed by the orthogonal line 202.

[0049] A second pivot drive 141 is provided for the pivoting movement of the third pivot arm pair, of which, as already described, only pivot arm 132 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 second 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 second pivot arm 131 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.

[0050] After the material web roll has reached a specified change diameter, the second pivot arm 131 is pivoted into a receiving position for receiving 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 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 pulleys 121 is interrupted.

[0051] Figure 2, in which the swivel drives are not shown for clarity, shows the situation in which the shaft 109 with the first material web roll 110 has been taken over by the second pair of swivel arms. Visible as an additional component is the front swivel arm 160 of a fourth pair of swivel arms. At its first end, the swivel arm is pivotally mounted on the machine frame via a fourth swivel bearing 161. The vertical 205, shown in dash-dotted lines, runs through the swivel bearing 161 and is aligned orthogonally to the horizontal.

[0052] At the second end of the pivot arm, a pressure roller is rotatably mounted, with which the material web 101, which continues to run off the material web roll 110, can be pressed against the new material web roll 151. The new material web roll 151, which is carried by the shaft 150, has been temporarily deposited in the main storage location. In order to be able to connect the material web 101 with the material web of the new material web roll 151, the pressure roller presses the material web 101 against the rotating, new material web roll 151 until its material web has been adhered to the material web 101. Subsequently, a separating knife (not shown) severs the material web 101 upstream of the pressure roller. The separating knife is preferably supported on the fourth pair of pivot arms.

[0053] Figure 3 shows that the material web 101 is now being unwound from the new material web roll 151. The shaft 109 is placed on the roller conveyor 170, which is attached to a support 172. As soon as the shaft 109 has rolled to the stop 171, it can be removed. For this purpose, the third pivot arm 132 has been pivoted away from the material web roll 110 and is in a maximum pivot position in which the shaft 135 is at the greatest possible distance in direction x from the vertical 200 of the main bearing point. The vertical 206, which runs through the shaft 135 and is aligned orthogonally to the horizontal, is again shown in dash-dotted lines. Figure 3 now shows that in the exemplary embodiment shown in the figures, all of the verticals described are arranged between the vertical 200 and the vertical 206 or the vertical 207. The area between these verticals can also be called the arrangement area.This results in a compact design of the device 100.

[0054] After the shaft 109 has been removed, the pivot arms 131 and 132 can be moved back again so that the initial state shown in Figure 1 has been restored.

[0055]

Claims

Patent claims Device for unwinding a material web from several material web rolls • with a machine frame • with a main bearing point attached to the machine frame for rotatably supporting the shaft of a first material web roll, wherein the material web roll can be unwound, • with a first pair of swivel arms, the first ends of which are pivotally mounted in the machine frame by means of first pivot bearings and the second ends of which carry a first drive shaft for rotating the first roll of material web, the first drive shaft acting on the outer circumference of the roll of material web, • with a second pair of swivel arms, the first ends of which are pivotally mounted in the machine frame by means of second pivot bearings and the second ends of which are adapted to receive the shaft of the first material web roll and / or to support the shaft of a second material web roll, • with a third pair of swivel arms, the first ends of which are pivotally mounted in the machine frame by means of third pivot bearings and the second ends of which carry a second drive shaft for rotating the material web roll, which second drive shaft is located on the shaft carried by the second ends of the second pair of swivel arms, the second drive shaft acting on the outer circumference of the material web roll • wherein the verticals of the first pivot bearings, the second pivot bearings and the third pivot bearings are arranged in an arrangement range which lies between the vertical of the main bearing point and the vertical of the second drive shaft when the latter occupies the maximum intended horizontal distance from the vertical of the main bearing point, or between the vertical of the main bearing point and the vertical of the line of the surface of the second drive shaft which is furthest from the vertical of the main bearing point, when the latter occupies the maximum intended horizontal distance from the vertical of the main bearing point. Device according to claim 1, characterized in that the second pivot bearings and / or the third pivot bearings are arranged closer to the vertical of the main bearing point than the first pivot bearings.Device according to one of the preceding claims, characterized in that the pivot bearings of the second and third pivot arm pairs are aligned with one another. Device according to one of the preceding claims, characterized in that the depositing device comprises vertical supports for supporting rails on which the shaft of the material web roll can roll, wherein the vertical supports are arranged further away from the vertical of the main bearing point than the vertical of the first pivot bearings. Device according to one of the preceding claims, characterized in that the first pivot arm pair and / or the second pivot arm pair and / or the third pivot arm pair can each be pivoted by means of at least one pivot arm drive, wherein at least one of the pivot arm drives is... a first end is pivotally mounted on a pivot arm and a second end is pivotally mounted in the machine frame via a pivot bearing, the verticals of the pivot bearing being arranged in the arrangement region. Device according to one of the preceding claims, characterized in that a fourth pair of pivot arms is provided, the first ends of which are pivotally mounted in the machine frame by means of fourth pivot bearings and the second ends of which carry a feed roller and / or a separating knife, the verticals of the fourth pivot bearings being arranged in the arrangement region. Device according to one of the preceding claims, characterized in that the fourth pivot bearings are arranged closer to the vertical of the main bearing point than the first, the second and / or the third pivot bearings.

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