The invention relates to a winding device for winding up a web-like material according to the preamble of claim 1.
Web-like material, such as plastic film, which is produced in a web production device, such as an extrusion device, is frequently not processed further directly, i.e., “in-line”, but rather first wound up into rolls using a so-called winding device. These rolls are first supplied to a further processing machine. Such further processing machines include printing presses, bag production machines, and many other machines.
Other materials, such as paper, are also wound up in a winding device and supplied to a further processing machine in the form of rolls.
These rolls are frequently formed in that the web-like material is wound onto a roll core. Before the web-like material reaches this roll core and/or the roll, on which web-like material is already wound, it is guided over a web guiding roller. This web guiding roller may be situated at a small distance to the roll core or to the roll (so-called “gap winder”) or may press the web-like material directly onto the roll core or the roll. In the latter case, the winding device is referred to as a contact winder. In both cases, the cited web guiding roller is typically the last roller over which the web-like material is guided before or when it reaches the roll core or the roll.
To prevent an air inclusion between the roll core or the roll and the new layer of the web-like material, a pressing element is frequently assigned to the roll, which may be positioned against the roll. This pressing element is typically designed as a pressing roller.
In known winding devices, the mechanism which is used for positioning the pressing elements on the roll, comprises carriages, in which the pressing roller or the pressing element is mounted on both ends, the carriages being situated so they are displaceable on two rails running parallel to one another. These rails are fastened to walls which also support the roll core. The carriages on which the pressing rollers are mounted are moved in the direction toward or away from the roll core using suitable actuators, such as a piston-cylinder unit.
This way of positioning the pressing roller on the roll core has the disadvantage of the large space requirement caused by a linear guide of the carriages.
The object of the present invention is to propose a winding device, in which the mechanism which is used for positioning the pressing element on the roll requires less space.
The object is achieved by a winding device according to the preamble of claim 1, which is additionally distinguished by the features of the characterizing part of claim 1.
Accordingly, the pressing element is mounted on both ends in lever arms, which form a lever arm pair. This pressing element may be a pressing roller, which is mounted so it is rotatable in this lever arm pair. The lever arms are mounted so they are rotatable in the walls, in which the roll core is also mounted. Because the bearing points of the pressing element in the lever arms and the bearing points of the lever arms in the walls are not coincident, the pressing element is finally pivotable around the bearing points of the lever arms.
In this way, rails are no longer necessary for the movement of the pressing element, but rather only lever arms, which are mounted so they are rotatable in one point. For this reason, the winding device according to the invention may be constructed significantly more compactly than a winding device according to the known prior art.
The question of the space requirement in so-called turret winders is of decisive significance. In this type of winding device, the roll core and the mechanism for positioning the pressing element are fastened on discs or plates, which are mounted so they are rotatable in the machine framework. At least one second roll core and at least one further mechanism for positioning pressing elements are mounted and/or fixed on each of these discs or plates. A turret winder is used, after a roll has been completely wound, for the rapid winding onto the second roll core of the new web beginning formed by a cut. An especially advantageous embodiment of a winding device according to the invention therefore comprises the cited features of a turret winder. Particularly in this case, the space requirement of the mechanism for positioning the pressing element directly influences the size of the discs and/or plates and also the drive power which is necessary for their rotation in the machine framework.
In an advantageous refinement of the invention, the pivot range of the lever arms is dimensioned in such a way that a pressing roller may come into contact with two roll cores alternately. In this way, the pressing roller, which does not have its own rotational drive, may be set into rotation by a rotating roll core. The pressing roller may thus be accelerated before it contacts the roll. An acceleration of the pressing roller by the roll on which web-like material has already been wound may result in damage to the web-like material.
Drive means are advantageously assigned to the roll cores, which apply a torque to the roll cores. A separate drive may be assigned to each roll core. Alternatively, two or more roll cores may be driven by one drive, a detachable coupling being provided between the drivetrain and the roll core to be able to stop the roll for the purpose of removal, while a further roll core is wound further.
In addition, the object of the invention is a method for the continuous winding of a web-like material into rolls according to claim 9. Further method steps which are part of the method according to the invention are described hereafter in the context of the description of the object.
Further exemplary embodiments of the invention are disclosed in the description of the object and the claims.
In the figures:
The roll core 5 is mounted so it is rotatable on both ends in discs, of which only the rear disc 7 is shown. The discs are in turn mounted so they are rotatable in the machine framework (not shown). The contact roller 3 is also mounted on the machine framework via elements which allow a movement of the contact roller 3 in relation to the roll core 5.
The pressing roller 6 is mounted via displacement carriages (not shown) in guides 8, the guides being fastened on the rails. The pressing roller 6 may be displaced in relation to the guides and thus in relation to the roll core 5 with the aid of piston-cylinder units or other suitable drives.
A second roll core 9 and further guides 10 are also mounted and/or fastened in the cited discs. The guides 10 also support a second pressing roller 11, which is assigned to the roll core 9, via these displaceable carriages.
By rotating the discs 7, the roll core 9 may be pivoted in the direction toward the contact roller, so that this roll core 9 comes into contact with the web-like material. The roll 4 is pivoted away from the contact roller 3 by the rotation of the discs. The web-like material may now be cut through by a cutting device (not shown), so that a new web beginning results, which may be fixed on the roll core 9 by suitable means. The old roll 4 may now be removed from the winding device and replaced by an empty roll core. In this way, a new roll results without the winding device having to be stopped for the purpose of changing the roll core.
In an advantageous embodiment, a gear ring or gear ring segment is fastened for this purpose on each disc 7, on which gear wheels fastened to a coupling shaft roll. Further gear wheels may be provided between gear ring or gear ring segment and gear wheels of the coupling shaft. The coupling shaft may be guided through an axial hole of the pressing roller 6, 11. If a torque is applied to one of the two lever arms, the coupling shaft rotates and transmits a torque to the particular other lever arm, the end of the coupling shaft which is mounted so it is rotatable in the other lever arm also rolling on a gear ring or gear ring segment. In this way, an exactly equal angle of the lever arms is ensured. This state of affairs is explained hereafter on the basis of
The lever arm 12 is mounted via a bearing 13 in the disc 7. The rotational axis of the pressing roller 6 is parallel to the rotational axis of the bearing 13. However, both axes are not aligned. This is also true for all other lever arms which are shown in these and the following figures, but also for the lever arms which are not shown.
The pivoting of the lever arm is performed, for example, by a drive motor onto whose rotor axis a pinion is plugged and fastened. This pinion engages with a gear wheel or gear wheel segment, which is fastened on a lever arm and whose rotational axis is aligned with the rotational axis of the bearing 13. An air motor, which is very compact and light, is preferred as the drive motor. This is discussed in still greater detail hereafter in the context of the description of
The pressing roller 11, which is mounted and driven in the lever arm 14 similarly to the pressing roller 6 mounted in the lever arm 12, is shown in a position pivoted away from the roll core 9 in the operating situation shown in
After the operating situation shown has been achieved, the web-like material is cut through by a cutting device (not shown). The web end thus resulting is wound further onto the roll 4. The web beginning resulting due to the cutting of the web-like material is fixed on the roll core 9 by a suitable measure, such as fixing by an adhesive. The web-like material 2 is now wound onto the roll core 9. In the meantime, the resulting web end has reached the old roll 4, so that the pressing roller 11 is no longer in contact with the web-like material 2. As soon as the new web beginning has been fixed on the roll core, the lever arm 14 is pivoted in the direction toward this roll core and the pressing roller 11 is thus positioned on the roll core. After the replacement of the roll 4 by a new roll core, the changing procedure is completed and the operating situation shown in
It is to be emphasized that the winding device shown in
A winding device which is also suitable for winding up rapidly running material is shown in
In
If the lever arms 14 are pivoted in relation to the discs 7, because of the described construction, both lever arms always assume the same pivot angle.
The pressing roller 11 is itself mounted so it is rotatable on the coupling shaft 23 using swivel bearings 25. As already described, the pressing roller is not driven. It is thus mounted so it is freely rotatable.
To be able to move the lever arms 14 in relation to the discs 7, gear wheels or gear wheel segments 26 are attached to the lever arms 14. Pinions 27, which are attached rotationally fixed to the drive shafts 29 of drive motors 28, engage with these gear wheels or gear wheel segments 26. These drive motors, which are advantageously implemented as air motors, are fastened to the discs 7.
Number | Date | Country | Kind |
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10 2006 047 995.5 | Oct 2006 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2007/060692 | 10/9/2007 | WO | 00 | 4/9/2009 |