|Title of Invention||
BELT FOR WINDING DEVICE
|Abstract||The invention relates to a belt for a winding device (1) for producing a lap (3), whereby the wadding (4) is wound up onto a core (10) that is in particular sleeve-like, said core is driven by a circulating endless belt (5). For the production of such belts said belts are cut from wide pieces of materials and thus sharp-edged edges result. When using such a belt with a winding device then these sharp edges have negative effects and lead to uneven lap edges. Therefore it is suggested, that the edges (11, 22) of the belt (5), that is those edges at the tgransition between the side edges (6) and the surface (o) that carrries the wadding (4), are chamfered (broken).|
Belt for winding device
The invention relates to a belt for a winding device to produce a lap whereby the wadding is wound up onto a, in particular, sleeve-like core which is driven by a circulating, endless belt.
In the publication of the DE-A1-195 39 365 such a winding device for the production of a lap is described and shown, whereby the lap is formed by using a flat belt. Thereby a loop of the belt is put around a sleeve, which is rotable mounted on a stationary shaft, whereby said loop of the belt, with increasing winding diameter, adapts itself in its size and nearly completely envelopes the lap at the end of the winding procedure. For the formation of the lap a wadding is introduced into the belt loop between two diverter rollers and passed over to the sleeve surface.
For guiding of the side edges of the wadding during the winding up procedure, a winding disk is arranged coaxially at each end of the sleeve, which supports the side edges of the wadding during winding up and which contributes to the formation of an even end surface of the finished lap.
The belt being led between the winding disks comprises a distance to the inside surfaces of these winding disks. In order to prevent fibres from the boundary zone of the lap sheet from getting jammed within the gap between the edges of belt and the winding disk, it was suggested in the disclosure EP-878 568, to limit the lateral shift of the belt during the winding up procedure. Thereby it was suggested to provide the belt, on that side which faces the outer surfaces of the diverter rollers, with a profiling (toothed segment), which runs in longitudinal direction of the belt. This profiling then engages in a corresponding counter profile of the diverter rollers and prevents thus a lateral shift of the belt.
With this measure was achieved that fewer fibres were pulled out of the boundary zones of the lap sheet, whereby the contamination of the belt, in particular in the boundary zones, was reduced.
Even though this measure has brought an improvement, it was, however, not yet satisfactory. Since the belt, during its production, is cut out of a wide piece of material, a relatively sharp edge zone is thereby created on the side edges at the transition to the surface of the belt, on which the lap sheet is led during the winding up procedure. As soon as the outer ends of the lap sheet get into the zone of the lateral winding disks between the gap of the respective winding disk and the side edge of the belt, this sharp edge of the belt works as a cutting edge and creates a shearing effect on the fibres within the boundary zone of the lap sheet. Thereby, fibres are pulled out of the lap sheet to some extent, and/or fibre segments are cut out. The consequence of this is the formation of a lap, which, along the entire side surface, comprises frayed and uneven edges of the wound up wadding.
This leads on the one hand to quality losses during the following processing procedure and increases on the other hand the generation of fibre fly, which again contributes to the contamination of the machine. I.e. the maintenance intervals for the cleaning of the machine must take place in shorter periods of time, and/or have to be performed more frequently.
Thus it is the task of the invention to provide a belt for a winding device for the formation of a lap which avoids these disadvantages and which ensures the formation of a high-quality lap.
This task is solved in that the edges of the belt, that is, those edges at the transition between the side edges and the upper surface that carries the wadding, are chamfered (broken). This means that the transition between the described surface and the side edges of the belt is formed geometrically in such a way that no sharp edges exist any longer. From this results that the belt must be refinished within the zone of these edges in order to chamfer the sharpened edges and/or to remove them after said belt has been cut.
Thereby it is ensured that no shearing effect is caused on the fibres at the side edges of the lap sheet by these edges of the belt within these boundary zones of the belt, whereby the aforementioned disadvantages are avoided.
Preferably a belt is recommended, which - seen in the cross section - consists of several layers and where the side edge of the upper-most layer, on which the wadding is led during the winding procedure, is provided with such a chamfering.
This chamfering can e.g. consist of a chamfer, whose surface includes an angle with the upper surface of the layer of the belt, on which the lap sheet is led during the winding procedure. Such a design of a chamfer is naturally also applicable with a belt, which consists only of one layer.
The chamfer can preferably start at a distance of 0.2 mm to 1.0 mm from the respective side edge of the belt. The inclination of the chamfer can include an angle of between 30° and 60°, preferably below 45° to the upper surface of the belt. There are, however, also further different angular positions conceivable. The belt layer, which faces the lap sheet, can preferably be formed from of a synthetic layer, which consists e.g. of several interconnected polyamide layers.
It is also possible to provide a rounded edge in place of the provided surfaced chamfer. Thereby preferably the radius of the rounding can amount to between 0,2 and 1,0 mm. Regarding the formation of the chamfer there are also combinations possible between a plane surface and a rounding.
The chamfer, and/or the rounding of the belt edges can e.g. be achieved through grinding of the edges of the belt It is, however, also possible to provide such a chamfer and/or rounding already during the production of the synthetic layer of the belt before this layer is connected with further layers to form the belt. In this case another production process for the belt is necessary, since it then cannot be produced by cutting it out of one wide piece of material. That means the belt must be manufactured individually.
Further advantages of the invention are disclosed and described in more detail by way of the following exemplified embodiments according to the figures, wherein shows:
Fig.1 a schematic side view of a winding device provided with the belt according to the invention;
Fig.2 a sectional view X-X according to Fig.1;
Fig.3 an enlarged partial view of the belt cross section according to Fig. 2 with a chamfer;
Fig.4 an enlarged partial view of the belt cross section according to Fig. 2 of a further exemplified embodiment of the belt with a rounding.
Fig.1 shows a winding device 1 with a flat belt 5, which is led across several diverter rollers R1 to R5. The belt 5 forms a loop S between the diverter rollers R1 and R2, within which a lap 3 is formed. Thereby, the lap sheet 4 (in short called wadding) supplied into the loop during the winding procedure by way of calender rollers KW is wound onto a sleeve 10. The sleeve 10 is stationary mounted between two lateral winding disks 7, 8 by means of journals 12 and 13 (see Fig. 2) rotatable around the axis of rotation D, D1.
While the lap 3 becomes larger the loop S also becomes larger. In order to tension the belt 5, and/or to compensate for the displacement of the belt while the loop S is increasing, a tensioning device 14 is provided. Thereby the roller R5 is pivotably mounted around a swivel axis by means of an arm 15.
As soon as the lap 3 has achieved its final size (being detected and monitored by means of sensors), then, by way of stopping the drive of the calender rollers KW, the lap sheet 4 is separated within the supply zone. After the stopping of he belt drive (one of the diverter rollers R1, R4 or R3 is connected with a drive unit not shown), the roller R2 is swivelled, by means of the swivel arm 9, in the direction of the arrow, to the right,
and, by cooperating with the tensioning device, moved outward to a not shown mounting means. Subsequently, after delivering of a new sleeve (not shown) and after swivelling the roller R2 back into the position shown in Fig.1, a new winding procedure is started. Further details relating to the process of the lap formation can also be taken from the already published DE-A1-195 39 365.
Figure 2 shows a sectional view along the line X-X, according to Fig.1, of the winding device 1 together with the diverter roller R1, wherefrom the belt loop S extends downwards for the lap formation. On the belt 5, rerouted downwards by means of the roller R1, the schematically indicated lap sheet 4 is transferred into the circumferential zone of the sleeve 10. The sleeve 10 is provided with openings, not shown in detail, at its outer circumference, said openings are connected with the inner space of the sleeve, to which a sub pressure source (not shown) is connected during the winding procedure. The sleeve 10 is clamped by means of mounting journals 12 and 13 in stationary mounted and horizontally shiftable winding disks 7 and 8. The winding disks 7, 8 are rotatable mounted by means of axes D, D1. As is seen in Fig. 2, a lap sheet 4 for the formation of a lap roll 3 has already been wound onto the sleeve 10. The belt 5 (not shown) can, on the side opposite the lap 3, e.g be provided with a tooth profile, which engages into a corresponding profile of the diverter roller R1, so that the lateral guidance of the belt 5 is ensured with respect to the winding rollers 7, 8. This can e.g. be seen from the embodiments shown in the published EP- 878 568. By this is essentially ensured that the determined distance a from the side edges of the belt 5 to the surfaces of the winding disks 7, 8 remains constant during the winding procedure. Merely the width B of the lap sheet 4 gets wider across the belt 5 due to the applied counter pressure, so that the outer edges of the lap sheet 4 approximately reach the inner surfaces of the winding disks 7, 8 and thus also come within the zone of the outer edges of the belt 5.
In order to form an even lap 3, in particular within the zone of its front-end surfaces, it is necessary to keep the distances a as small as possible. As soon as the lap sheet 4 gets into the zone of the belt edges of the belt 5, said edges would, in case of a conventional and common embodiment, due to the given shearing effect, pull and/or cut fibres out of
the fibre compound of the lap sheet 4. Therefore, these belt edges, which, during the winding procedure, come into contact with the lap sheet 4, were formed according to the embodiments, as they are illustrated in the enlarged view in the figures 3 and 4.
In Fig. 3 is additionally schematically indicated the position of the sleeve 10 and two layers of the lap sheet 4 that has already been wound. The belt 5 is thereby formed multilayered and comprises a tensioning layer 16, by means of which a counter pressure is applied on the wadding 4 during the lap formation. The tensioning layer 16 can for instance consist of several plastic layers (e.g. polyamide) that are laid on top of each other, said layers being fixedly interconnected and/or welded. Below the layer 16, in the present example, a fabric layer 17 is arranged, which in particular is provided for the transverse rigidity of the belt. The distance of this fabric layer to the upper surface O of the belt 5. on which the wadding 4 is led, should be so large that the wadding, during the winding procedure, can not get into the zone of this fabric layer. Thereby it is ensured that thread ends of the fabric that possibly still project laterally over the edge of belt do not come into contact with the wadding. Thereby is ensured that the possibly still present projecting ends of the fabric layer do not cause damage within the edges of the wadding due to the extraction of fibres. It would be conceivable that during the grinding of the edges, also the side edges of the belts are ground in order to eliminate possibly still projecting fibre ends.
Below the fabric layer 17 there is an elastic layer 20 made of rubber, which is connected with said fabric layer and which is attached and/or vulcanised thereon. This rubber layer 20 has, due to its elasticity, the function that the belt 5 fully contacts at the diverter rollers during the diversion and that no slip results.
To increase the wear resistance and as a protective layer for the rubber, a further fabric layer 21 is provided below the rubber layer 20. The surface of this fabric layer 21 is suitably sealed, and/or treated, so that it is fibre adherence-free. It would also be conceivable to also provide a coating on the side edges 6 of the belt 5 in order to make these entirely fibre adherence-free.
At the transition from the surface 0 to the side edges 6 of the belt 5, a chamfer 11 is provided, which is formed as an inclined surface with an angle a. The distance c, up to which the chamfers extend from the side edge 6 inward, can amount to between 0.2 and 1.0 mm. The shown arrangement was intentionally not drawn in full-scale, in relation to the size of the belt, in order to be able to better visualise it. By means of this chamfer 11 the otherwise usual sharp-edged transition between the side edge 6 and the surface O was eliminated, whereby the risk of damage of the edges of the wadding described before, is prevented. The edges, still remaining within the zone of the chamfer 11, run in an obtuse angle (larger than 120°) towards each other and are thus not sharp-edged.
In Fig. 4 a further embodiment is shown, whereby, in place of the chamfer 11, a rounding 22 with a radius r is provided. The remaining structure of the belt 5 corresponds with the layout of the exemplified embodiment according to Fig. 3, therefore it is not described again here. In this embodiment with the rounding 22 no more edges remain within this transient zone, whereby said roundings affect the edges of the wadding still more smoothly. The production of such a rounding 22 is, however, with regard to the production process, possibly somewhat more elaborate, and costlier. As described before, the chamfer 11, and/or the roundings 22 can be obtained by grinding or they are already taken into account during the production of the tensioning layer 16.
The invention is not limited to the belt layout shown in the exemplified embodiments, but all other possibilities of a belt design are also included. Thereby it is essential that the edges at the transition from the surface 0 to the side edges 6 are broken, and/or chamfered.
1. Belt for a winding device (1) for producing a lap (3), whereby the wadding (4) is rolled up onto a core (10) which in particular is sleeve-like, said core being driven by a circulating, endless belt (5), characterized that the edges (11, 22) of the belt (5), that is, those edges at the transition between the side edges (6) and the surface (O) that carries the wadding (4), are chamfered (broken).
2. Belt according to claim 1, characterized in that the belt (5) - seen in the view of the cross section - comprises several layers (16, 17, 20, 21) and that the side edges of the surface (O) of the layer (16), on which the wadding (4) is led during the winding procedure, are provided with a chamfering (11, 22),
3. Belt according to claim 2. characterized in that the chamfering (11) - seen transverse to the longitudinal direction of the belt (5) - amounts to in between 0.2 and 1.0 mm.
4. Belt according to claim 3, characterized in that the chamfering (11), in relation to the surface (O) of the layer (16), includes an angle between 30"* and 60"*, preferably 45°.
5. Belt according to one of the claims 2 to 4, characterized in that the layer (16) which is provided with the chamfering (11, 22) consists of synthetic (plastic) material.
6. Belt according to claim 5, characterized in that the synthetic layer (16) consists of multi-layered polyamide layers connected with each other.
7. Belt according to claim 1, characterized in that the edges (22) are rounded and that the radius of the rounding amounts to between 0.2 and 1.0 mm.
Belt according to one of the claims 2 to 7, characterized in that the belt comprises at least one layer, which is provided with tensioning means.
Belt according to one of the claims 2 to 8, characterized in that chamfering is obtained by grinding.
10. A belt for winding device, substantially as hereinabove described and illustrated with reference to the accompanying drawings.
The invention relates to a belt for a winding device (1) for producing a lap (3), whereby the wadding (4) is wound up onto a core (10) that is in particular sleeve-like, said core is driven by a circulating endless belt (5). For the production of such belts said belts are cut from wide pieces of materials and thus sharp-edged edges result. When using such a belt with a winding device then these sharp edges have negative effects and lead to uneven lap edges. Therefore it is suggested, that the edges (11, 22) of the belt (5), that is, those edges at the transition between the side edges (6) and the surface (0) that carries the wadding (4), are chamfered (broken).
|Indian Patent Application Number||852/CHE/2003|
|PG Journal Number||26/2011|
|Date of Filing||22-Oct-2003|
|Name of Patentee||MASCHINENFABRIK RIETER AG|
|Applicant Address||KLOSTERSTRASSE 20 CH-8406 WINTERTHUR|
|PCT International Classification Number||D01G27/00|
|PCT International Application Number||N/A|
|PCT International Filing date|