The invention relates to a roll-removal device, a winding device according, and a method as described in greater detail below.
Rolls on which films in web form, particularly plastic films, have been rolled, are often held on a winding shaft, in order to be able to treat or process a plurality of individual webs simultaneously.
Subsequently, these wound rolls must be removed from the winding shaft and new rolls must inserted over the winding shaft. For this purpose, generally a displacement device is provided by which the wound rolls can be displaced relative to the winding shaft. This displacement device may have a support surface onto which the wound rolls are placed. Due to static friction between the wound roll and the support surface, the wound roll can be removed from the winding shaft by axially displacing the support surface. To assist in this, holding elements may be provided which prevent slipping of the wound roll on the support surface.
The wound rolls are then transferred to a receiving device which receives them, so that they can then be, e.g., transported further, gathered together, or packaged.
The rolls are transferred from the displacement device to the receiving device, for which purpose the rolls should be freely rollable, at least in certain regions. The means of transferring may be, e.g., pressure means, tilting of the displacement device, or a combination of these.
A problem with this approach, however, is that during the course of free rolling the end faces of the rolls can become caught, making it difficult to roll them in a straight line, and this can ultimately lead to damage to the goods which have been wound onto the rolls.
The object of the present invention is thus to devise a device and a method whereby such damage is avoided.
This object is achieved according to the invention by the features of the claims considered in the aggregate. Possible refinements of the invention are set forth in the drawings and in the description. Features which are described in connection with the inventive devices may be also exploited in connection with the inventive method, and vice versa, so that they may be referred to in a somewhat interchangeable manner.
According to the invention, a device for changing the positions of the roll axes of the rolls is proposed whereby the roll axes of two adjacent rolls can be brought to an angle of less than 180 degrees in relation to each another.
When the rolls are still on the winding shaft, or shortly after they are removed from the winding shaft, the roll axes of two adjacent rolls will be at an angle of 180°. The roll axis of a roll is deemed to be the direction of the main axis of inertia of the roll. The roll rolls around this roll axis when it is rolling in a rolling direction with its peripheral surface on a support surface. If the roll axes of two adjacent rolls subtend an angle less than 180°, this means that their rolling directions are not parallel but occur at an angle greater than 0 degrees. In such an instance, the rolls will roll apart, with their end faces moving farther apart. Under these circumstances, despite the fact that they are freely rolling they will not come into contact and thus will not become stuck; accordingly, it is nearly impossible for the wound goods to become damaged.
According to an advantageous embodiment of the invention, a device for accelerating the rolls is provided. By this it is meant that a force acts on the rolls which causes them to roll in a rolling direction. With such an arrangement it is readily possible to arrange the roll axes of two adjacent rolls at an angle of less than 180°.
According to another advantageous embodiment of the invention, the device for accelerating the rolls comprises a device for tilting a support surface on which the rolls lie. The tilting axis is parallel to or essentially parallel to the axial extent of the winding shaft. This embodiment is particularly advantageous if the support surface has an angular configuration so as to form a trough parallel to the axial direction of the winding shaft. With this arrangement, the rolls are unable to roll in lateral movement relative to the winding shaft. When the support surface is tilted, it is no longer necessary to contribute potential energy to pass over the sides of the trough, in order to cause the rolls to move.
It is particularly advantageous if the device for changing the positions of the roll axes of the rolls is comprised of at least one displacement element which is disposed along a convexly configured line. In this context, the term “convex” means that the ends of the line of rolls which still have their roll axes at 180° are farther than the middle of the line. This displacement device can now influence the rolls in a particularly simple manner, such that the roll axes of two adjacent rolls can be brought to an angle of less than 180°. As a result of the inertia of the rolls, a displacement element with a convexly extending line configuration will roll first, because the displacement element has only a single contact point with the roll, and will rotate it first around a vertical axis before the roll rolls away. To ensure that the described rotation will occur prior to the rolling away, it is advantageous if the described displacement device cooperates with the abovementioned device for tilting. In this case it may be provided that the displacement element acts first on the rolls before the device for tilting is actuated, which latter device will cause the rolls to roll away.
According to a preferred embodiment of the invention, a tube, rod, and/or bar, which may be convexly configured, may be employed. This provides a simple element which can act upon an appreciable number of rolls. It is preferred that the convex configuration be present at least in the projection of the element in the rolling plane of the rolls, so that the above-described effect (of rotation of rolls around a vertical axis) also occurs.
According to another embodiment of the invention, it is provided that the displacement element comprises a roll or wheel the axis of rotation of which is disposed tangentially to the convexly configured line, or is parallel to such a tangent. Use of a roll or wheel affords the advantage that it rolls against the rolls, so that wound goods are minimally damaged.
According to another advantageous embodiment, such rolls may be freely rotatably mounted and/or drivable. If a roll is freely rotatable, it can be readily driven into rotation, so that a drive may be employed to cause the rolls to travel in rolling movement.
Further, it may be provided that the rolls or wheels have a peripheral surface which is comprised of polytetrafluoroethene, at least in some regions. Thereby the adhesion between the wound goods and the roll or wheel is further reduced, thus further reducing the risk of damage.
According to a particularly preferred embodiment of the invention, it is provided that the displacement device and/or the receiving device has/have prominences by means of which the frictional contact of the rolls with the displacement device and/or the receiving device can be reduced, for at least a brief time. In this connection, the surfaces of the prominences preferably have small areas, so as to reduce the contact surface of the rolls with the displacement device and/or the receiving device. Consequently, frictional contact is reduced. An individual roll thus rolls on one or more of these prominences, with the contact surface comprising only a small part of the previous contact surface. This provides a large advantage in particular if the roll is now rotated around a vertical axis. Stated differently, the prominences are particularly advantageous for the situation where the rolls are acted upon by a pushing element having at least one pushing organ disposed on a convexly extending line.
With the above-described embodiment, it is advantageous if at least a part of the prominences is formed in the displacement device and/or the receiving device. This means that these devices and the prominences are comprised of the same material, and the prominences are produced in the material by, e.g., stamping. This may provide a simple and easy means of production.
Since at least some wear will occur on the prominences, it is advantageous if at least a part of the prominences is disposed in or on the displacement device and/or the receiving device, namely said prominences being present as separate components applied at the surface and possibly extending inward. This facilitates replacement. Other suitable materials may also be employed, which provide the rolls with low frictional characteristics.
Thus, it is advantageous if at least a part of the prominences is comprised at least partly of polytetrafluoroethene. This material has particularly low frictional resistance.
According to another advantageous embodiment of the inventive roll-removal device, it is provided that the device for changing the positions of the roll axes of the rolls is disposed on a displacement device by means of which said device can be moved transversely to the axis of the winding shaft. This displacement device may be regarded as a concretization of the more generalized displacement device described above, wherewith the particular displacement device here is capable of an essentially linear movement. A wide variety of drive means are available which could be used to generate such linear movement. The preferred such drive means comprise a compressed air cylinder, which is advantageous from the standpoint of purchasing and also maintenance.
According to an advantageous improvement according to the invention, the displacement device has rails disposed on both sides of the support surface, with slides being provided which can be moved over said rails. The slides bear the device for changing the positions of the roll axes of the rolls.
As mentioned above, the object of the invention is also achieved by a method; according to the method, the roll axes of two adjacent rolls can be brought to an angle of less than 180 degrees in relation to each another, by means of a device for changing the positions of the roll axes of the rolls.
Additional exemplary embodiments of the invention will be apparent from the description, and the drawings.
A winding shaft 6 is illustrated. The shaft 6 is shown as being rotatably mounted in the parts 3, 4 of the machine frame; however, this is a simplified representation. As a rule, the winding shaft is rotatably mounted in auxiliary frames, so as to be movable radially and/or in the circumferential direction of the web guiding roll. Movement in the circumferential direction is needed, e.g. in the course of an automatic change of rolls. The adjustability in the radial direction relative to the web guiding roll 5 is needed in order to be able to adjust the above-described distance between the web guiding roll 5 and the winding shaft 6.
The winding shaft 6 bears one or more winding cores 7, four such winding cores being shown in the present exemplary embodiment. At the point in time illustrated, the winding cores have several layers of material web wound onto them, wherewith each winding core 7 is associated with a specific material web 8. A winding core 7 and the associated and already wound part of the material web 8 form a “winding roll” 9. The material webs 8 as a rule are generated from a single web of material. In order to prevent contacting of the edges of a material web which has been separated into separate individual material webs 8, the material webs 8 are disposed at a distance 10 from each other, on the web guiding roll 5. This distance in each case is often set up by cutting out and removing a narrow strip from a material web, between two material webs 8. The individual winding cores 7, however, are in contact with each other, wherewith ultimately the end faces of the winding cores extend outside of the ends of the wound material webs.
Winding rolls 11 which have been wound to completion and which have been removed from the winding device 1, are disposed on the roll-removal device 2, which is illustrated in
Due to the generally high weight of the rolls, the holder 13 cannot hold them via the winding shaft, but rather the rolls rest on a receiving table 14 which is trough-shaped so that the rolls cannot accidentally roll off of the receiving table 14.
The roll-removal device 2 can be mounted on roller conveyors or rails, and can be displaced by means of wheels in the direction of the arrow z.
In addition, the roll-removal device 2 is comprised of a transfer device 15 by means of which the rolls 11 can be passed to a receiving device 21.
The receiving device may in turn transfer the rolls to a transporting device for removal or for further transport, or may transfer them to a packaging machine for packaging the rolls. The receiving device may itself serve for the further transport function.
The transfer device 15 comprises, as core elements, slides 16 which are movable on rails 17 disposed on both sides of the receiving table 14. For this purpose, a drive is. Between two slides, a pushing device 20 is provided. In the exemplary embodiment illustrated, it is comprised of a curved rod 18, the point of maximum deviation which, located approximately midway between the slides 16, and regarded in the y-direction, comes closest to the trough of the receiving table 14 and thereby closest to the rolls. From there, the rod, regarded in the direction of the slides, becomes increasingly more distant from the rolls 11. Small rolls 19 are provided which are freely rotatable on the rod and which taken together overall have a convex shape contributed by the rod. In place of the rolls, small wheels may be provided. It is advantageous if the rolls 19 or the wheels are very easy to move, wherewith thus they will not damage the rolls 11 when they contact said rolls.
The slides may also bear a support element 25 which, similarly to the receiving table 14, is trough-shaped; empty winding cores 7 are placed on said support element. These winding cores 7 are available as replacements when changing winding rolls.
The roll-removal device 2 may further be configured so as to tilt the receiving table 14. For this purpose, a device is provided for producing a tilting force, which device operates by causing a lowering of the side 22 of the receiving table which faces away from the pushing device 20 and/or a raising of the side 23 of the receiving table which faces toward the pushing device 20 (where the notions of “facing away from” and “facing toward” are regarded from the position of the rolls 11); in this way, the rolls can be rolled off of the receiving table.
The side 22 of the receiving table 14 which faces away from the pushing device is provided with burl-like prominences 24 which extend out of the surface of the receiving table 14. These nubs are advantageously arranged along a line which runs essentially parallel to the trough. They may be inserted in and fixed in holes in the receiving table. Also it is possible for them to be of unit construction with the receiving table.
Changing of the rolls, and in particular transfer of the rolls 11 to the receiving device 21 will now be described, with reference to
Next, as illustrated in
When the pushing device is moved farther, other rolls are also engaged in the described manner.
Regardless of whether a movement away resulting from pressing occurs first or the described rotation occurs first, the effect will be that the roll axes of the rolls will no longer be aligned, and will no longer subtend a 180° angle. Instead, the rotational axes will form a set of tangents which are disposed along a curved line analogous to the rod 18. Accordingly, pairs of these rotational axes will subtend between them an angle of less than 180°. The aggregate effect of this is that the rolls roll in slightly different directions. These rolling directions are represented in
In the described process, tilting of the receiving table 14 can have a beneficial effect. This procedure is advantageous because then the pushing device does not by itself have to apply all of the force for instituting the movement of the rollers 11. Excessive pressure applied to the rolls by the rolls 19 could damage the former. Moreover, without the assistance of the tilting, the rod 18 might need to be made more massive.
In the described manner not only is a roll-removal device provided, but also a winding system with a winding roll changing device and a roll-removal device.
In the preceding description of the drawings, and also in the descriptions prior to that, various features have been described in conjunction with other features. However, any combination of features is possible, and such combinations may be employed, to the extent that they are practicable.
Number | Date | Country | Kind |
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10 2014 226 859 | Dec 2014 | DE | national |
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/EP2015/080435 | 12/18/2015 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2016/102349 | 6/30/2016 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
5810966 | Semba | Sep 1998 | A |
5911384 | Peters | Jun 1999 | A |
5941474 | Cushing | Aug 1999 | A |
Number | Date | Country |
---|---|---|
102010003947 | Oct 2010 | DE |
102013108831 | Nov 2014 | DE |
0905070 | Mar 1999 | EP |
WO9929480 | Jun 1999 | WO |
WO2014183887 | Nov 2014 | WO |
Entry |
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PCT Notification of Transmittal of Translation of the International Preliminary Report of Patentability dated Jul. 6, 2017, issued for PCT Application No. PCT/EP2015/080435, as well as the English translation document, 8 pages. |
Number | Date | Country | |
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20170267477 A1 | Sep 2017 | US |