Patent Application
20150122936
The invention relates to an unwinder, particularly for films, having a housing and having crosspieces disposed laterally in the housing.
Unwinders of the type stated initially are used, in many cases, in packaging of goods or products of all kinds, particularly when it is a matter of packaging the goods and products in film or paper.
For this purpose, the unwinders known from the state of the art have a housing part that also encloses a region of the accommodation and cutting apparatus. In this connection, the housing part, which is generally produced from plastic, is dimensioned in such a manner that it reaches beyond the lateral face sides of a roll, for example a film roll.
The unwinders have a winding core that is laid laterally so as to rotate, by way of crosspieces that project into the winding core. For this purpose, the previously known unwinders generally have a disk at their two face ends, which is connected with the crosspiece in centered manner, so that the roll is held in place between the two crosspieces by means of pushing the winding core onto the crosspieces.
Unwinders of the type stated initially are furthermore provided with a hinged lid and a slide slot, on the front side, which is longer than the width of the product to be unwound, for example a film, or has a length that corresponds to the width of the product.
The method of functioning of the unwinders of the type stated initially is structured such that after the roll has been laid into the housing, a piece of the film end is pulled out as needed (with one hand), in order to cut the piece of the film end in question off from the roll by means of the cutting apparatus. For this purpose, the hinged lid is pressed down, in order to bring about a clean cut of the film.
In this connection, the winding core rotates about the crosspieces. In this connection, the winding core is held in place with an almost precise fit, in other words with a certain play between winding core and crosspieces.
It has been found that winding cores can have country-specific diameters, which are larger than the diameters of conventional crosspieces, particularly in the case of unwinders used in Asia and North America. However, this has the disadvantage that too much play exists between crosspiece and winding core, so that the rotational movement of the core and therefore the unwinding process are impaired.
It is therefore the task of the present invention to further develop an unwinder of the type stated initially, in such a manner that the functionality of the unwinders is guaranteed even for larger winding cores or larger rolls.
This task is accomplished with the characteristics of claim 1. Advantageous embodiments of the invention are evident from the dependent claims.
The invention provides that the crosspiece is provided with an accommodation element, the surface sections of which, corresponding to the crosspiece, enclose the crosspiece in releasable or non-releasable manner, and have accommodation surfaces for the product to be unwound.
It is the fundamental idea of the invention to increase the diameter of the crosspiece, which is required for accommodation of the product to be unwound or the winding core, by means of a supplemental piece that encloses a conventional crosspiece accommodates the winding core or the product to be unwound.
This accommodation element can be configured in one piece with a conventional, standardized crosspiece, during the course of new production of an unwinder.
Alternatively, however, it is also possible to push the accommodation element onto the crosspiece, by means of an axial relative displacement that takes place with regard to a conventional crosspiece, so that the accommodation element lies on the crosspiece in releasable and planar manner.
It is the advantage of the invention that the diameter of a conventional crosspiece of a common unwinder can be expanded, right from the start or subsequently, so that a winding core or a product to be unwound can also be adapted to country-specific diameters, independent of the crosspiece thickness.
In order to cover a plurality of paper rolls and film rolls having different dimensions, it is advantageous if the housing has a length between 335 mm and 345 mm, preferably at least 340 mm, a width between 835 mm and 845 mm, preferably at least 840 mm, and a height between 695 mm and 705 mm, preferably at least 700 mm. It has been found that by means of the selection of these dimensions, a plurality of unwinders from different manufacturers and vendors can be used. It also contributes to this that the crosspiece advantageously has a length between 14.5 mm and 15.5 mm, preferably 15 mm, and the disk has a diameter between 44.5 mm and 45.5 mm, preferably 45 mm.
A practicable variant of the invention provides that the accommodation element has a length between 9 mm and 10 mm, preferably 9.5 mm, so that the end region of the crosspiece, facing away from the disk, stands free.
An advantageous embodiment of the invention provides that the accommodation element has arc-shaped projections—similar to a paddle wheel. In this connection, the projections can be composed of plastic, so that the projections are flexible and there adapts even to slight changes of a diameter of winding cores. In this connection, the width of the projections preferably amounts to between 9 mm and 10 mm, preferably 9.5 mm.
A diameter between 30 mm and 40 mm, preferably 35 mm, has proven itself as a proven dimension for the diameter of the accommodation element, which can accommodate a plurality of paper rolls and film rolls.
In order to guarantee easy use of the unwinder, a further practicable variant of the invention provides that the disk and/or the crosspiece and/or the accommodation element are releasably connected with one another. In this way, undesirable dirt locations can also be eliminated; this are situated, for example, in the transition region between crosspiece and disk.
In the following, the invention will be explained in greater detail, using the drawings. These show, in a schematic representation:
a and 1b a top view and side view of the unwinder according to the invention,
a, 1b show an unwinder provided with the reference symbol 1.
The unwinder 1 has a housing 2 that is provided with a releasable cover 4 on the top side. The housing 2, produced from plastic, is dimensioned in such a manner that even larger rolls 3 can be laid around the accommodation element 9 with their winding core, so as to rotate. The housing 2 has a length of approximately 340 mm, a width of approximately 840 mm, and a height of approximately 700 mm, and is so wide that it reaches beyond the two face sides of the roll 3.
On its front side, the housing 2 has a cutting apparatus 5 in the form of a blade, and a hinged lid 6. The roll 3 that is laid into the housing 2 is pulled out of the housing 2, as needed, in order to be separated from the roll 3 by means of the cutting apparatus 5. In this connection, the hinged lid 3 is pressed down, in order to allow a clean cut of the film rolled up on the roll 3.
As is furthermore evident from
The surface sections of the accommodation element 9 corresponding to the crosspiece 10, which are shown in
The accommodation element 9 shown in
As is evident from
The projections 12 shown in
A further embodiment of the unwinder 1 provides, as illustrated by
The present invention is not restricted, in terms of its embodiment, to the exemplary embodiments indicated above. Instead, a number of variants is possible, which make use of the solution presented even for embodiments of a fundamentally different type. For example, the accommodation surfaces of the accommodation elements 9 can have geometries different from the ones shown in the above exemplary embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2012 105 024.4 | Jun 2012 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2012/068933 | 9/26/2012 | WO | 00 |
