EP0581773B1 - Plastic bobbin carrier - Google Patents

Abstract

PCT No. PCT/DE92/00310 Sec. 371 Date Dec. 22, 1993 Sec. 102(e) Date Dec. 22, 1993 PCT Filed Apr. 15, 1992 PCT Pub. No. WO92/18408 PCT Pub. Date Oct. 29, 1992.A plastic bobbin carrier for taking up threads and yarns, with a cylindrical or conical shell provided with radial openings and with one end ring at each end of the shell, whereby this shell is comprised of several cylindrical or conical shell segments. These shell segments form a joint cylindrical or conical inner shell surface. Supporting webs join these shell segments together. These supporting webs run in a straight line or helicoidally from one end ring to the other, resting on the inner surfaces of the shell segments to which they are joined as one piece. The supporting webs may be rigid or ductile. When ductile supporting webs are employed, axial, radial, or axial and radial compressibility of the bobbin carrier in attainable.

Description

The invention relates to winding carriers made of plastic material for receiving threads and yarns with a cylindrical or conical jacket provided with radial openings, forming a winding surface and with an end ring at each end of the jacket, the jacket consisting of several spaced apart, a cylindrical or conical jacket inner surface-forming jacket sections is formed, which are coupled to one another by supporting webs.

In such a known winding carrier (DE 24 08 949 A1) parallel intermediate axially spaced intermediate rings are provided between two end rings, between which axially parallel webs for connecting adjacent intermediate rings are located. The webs have kinking points that make it easier to buckle radially to the axis and thus enable the winding carrier to be shortened axially.

In this known winding carrier, a minimum distance is determined by the fact that the webs have to find space between the rings even after axial compression of the winding carrier, which distance cannot be undercut. To produce this known winding carrier, several mold segments are required, each of which is then pulled radially when it is removed from the mold. In this case, it is imperative that all webs formed by such a shaped segment are demolded in the same direction of pull and designed accordingly in their flanks. As a result, the Cross-sections of adjacent webs differ from each other if you do not work with an uneconomically high number of shape segments. Viewed over the circumference, this winding carrier accordingly has different webs, which can differ from one another, for example, in terms of their bending rigidity.

Furthermore, in the known winding carrier, the webs engaging on a ring are each offset in the circumferential direction from one another. With axial compression, this results in deformation of the respective rings, which can be undesirable.

There is also a winding carrier known (DE-PS 1 635 084), which has generally proven itself in the wet treatment of threads and yarns, ring elements are provided between the end rings arranged on the end face, between which essentially axially extending connecting webs are provided. The connecting webs together with the ring elements form a winding surface on which the inner layers of a thread or yarn package come to rest. The inner windings of such coils therefore rest on the ring elements and on the outer edges of the connecting webs extending into the winding surface. The individual ring elements are to be regarded as rigid.

In this known winding carrier, it is due to the fact that the inner turns of the winding lie directly on the connecting webs deforming when pressed together and changing their distance from the adjacent ring elements, for clamping the inner thread turns between two sections of a connecting element or between one Connection element and an adjacent ring element come. In this way, the inner turns are occasionally destroyed and can no longer be unwound properly. In addition, the production of this known winding carrier requires the use of a multi-part shape in order to achieve the required radial extension of the cross section of the support elements ensure.

The invention is based on the object of developing a winding support of the type mentioned in such a way that, in particular, its manufacture is simplified and the effort required for the shape is considerably reduced.

This object is achieved according to the invention in a winding support of the type mentioned at the outset in that the supporting webs run from one end ring to the other in a straight line or helically, have a constant cross-section over their entire length or decrease in one direction, while sitting on the inner surfaces of the jacket sections and are integrally connected to these and project radially at least on one end ring beyond its radially innermost surface.

The mold required for injecting such a winding carrier only requires two outer molded parts and a core which can be formed in one piece and pulled towards one end of the mold, for which purpose a rotary movement of the core is additionally required in the case of a helical course of the supporting webs.

The jacket sections can be provided with perforations in a known manner. In addition, it is possible to roughen or corrugate the surface of the jacket sections.

The winding support according to the invention can also be designed such that the supporting webs are designed to be deformable in their pieces lying between two jacket sections.

In this embodiment, the winding carrier can be axially and / or radially compressed in order to enable compressing axially superposed coils or a reduction in circumference with shrinking yarn. The winding support is therefore also for coloring and thermal treatment suitable for yarns.

The arrangement of the supporting webs according to the invention means that they come into contact with the yarn. Consequently, even in the case of axial or radial compression, kinking or bending over of the supporting webs can never lead to the jamming of threads or yarns on adjacent jacket sections.

The winding support according to the invention can also be designed such that in the area of the inner surface of the jacket the distances between the jacket sections are partially closed by a film layer. With this film layer, the passage area, which is otherwise primarily determined by the distances between the jacket sections, can be reduced to the desired dimension. The passage area left free by the film layer can vary over the height of the winding support.

The winding support according to the invention can also be designed such that the film layer is profiled on its radially outward-facing side and has zones of reduced bending stiffness. In this way it can be ensured that the film layer always bends radially inwards and never outwards when compressed.

The winding support according to the invention can also be designed so that the jacket sections are parallel rings, the axes of which coincide with the longitudinal axis of the winding support. The jacket surface carrying the yarn package is determined solely by the rings, which approach one another in the case of axial compression, but cannot come into direct contact with one another due to the support webs provided on the inside.

The winding support according to the invention can also be designed so that the jacket sections of the turns of at least one spiral from one end ring to the other Supporting element are formed.

The winding support according to the invention can also be designed such that the jacket sections are circumferentially spaced support pieces which engage in the circumferential direction while leaving a gap, the support webs each sitting on the inner surfaces in the area of the interlocking parts of the support pieces. Thus, the sleeve according to the invention can also be designed in such a way that it can be compressed radially, that is, it can take into account shrinkage of the spooled yarn, which can occur in particular during its thermal treatment.

The winding support according to the invention can thus be designed such that it is compressible either only axially or only radially or axially and radially. For each type of compression, cams can be provided in addition to the supporting webs, which ensure that the desired distance between adjacent jacket sections is maintained.

The winding support according to the invention can also be designed so that each support piece runs continuously from one end ring to the other. These support pieces can be provided with perforations. This will be necessary in particular when working with only a few supporting pieces, which consequently have a relatively large circumferential extent.

The winding support according to the invention can also be designed so that the support pieces are divided in the axial direction into a plurality of spaced parts connected by support webs. Such a winding support is compressible in the axial and radial directions.

The winding support according to the invention can also be designed such that the jacket sections on their mutually facing edges in the region of the course of a supporting web Show bulges. In this way, the length of the deformable support webs running between two adjacent jacket sections is increased. This can be useful in order to be able to implement the desired compression in connection with the required cross-sectional dimensions of the supporting webs.

The winding support according to the invention can also be designed such that the distance between the jacket sections increases and / or decreases with increasing distance from an end ring. In this way, the passage cross section for a dyeing liquor or the like can be made more uniform.

Fig. 1

eine erste Ausführungsform des erfindungsgemäßen Wickelträgers, bei der die Mantelabschnitte als Ringe ausgebildet sind, links im Axialschnitt und rechts in Seitenansicht,

Fig. 2

in der oberen Hälfte eine Ansicht in Richtung des Pfeils 2 in Fig. 1 und in der unteren Hälfte einen Schnitt nach der Linie 2-2 in Fig. 1,

Fig. 3

die Hülse nach Fig. 1 in axial zusammengepreßtem Zustand,

Fig. 4

eine dem Wickelträger nach den Figuren 1 bis 3 ähnlichen Wickelträger mit spiralförmig verlaufenden Tragstegen,

Fig. 5

eine weitere Ausführungsform des erfindungsgemäßen Wickelträgers, bei der die Mantelabschnitte von den Windungen spiralförmig verlaufender Tragelemente gebildet sind,

Fig. 6

eine radial kompressible Ausführungsform des erfindungsgemäßen Wickelträgers, bei der die Mantelabschnitte schalenartig von einem Endring bis zu anderen verlaufen,

Fig. 7

eine Detailansicht auf zwei benachbarte Ringe und einen verbindenden Tragsteg,

Fig. 8

eine Detailansicht gemäß Fig. 7 im axial komprimierten Zustand,

Fig. 9

einen Detailschnitt durch zwei übereinanderliegende Ringe und eine außenseitig profilierte verbindende Filmschicht.

In the following part of the description, an embodiment of the winding support according to the invention is described with reference to drawings. It shows:

Fig. 1

a first embodiment of the winding support according to the invention, in which the jacket sections are formed as rings, on the left in axial section and on the right in side view,

Fig. 2

in the upper half a view in the direction of arrow 2 in Fig. 1 and in the lower half a section along the line 2-2 in Fig. 1,

Fig. 3

1 in the axially compressed state,

Fig. 4

FIG. 1 a winding carrier similar to the winding carrier according to FIGS. 1 to 3 with spirally extending supporting webs,

Fig. 5

a further embodiment of the winding support according to the invention, in which the jacket sections are formed by the turns of spirally extending support elements,

Fig. 6

a radially compressible embodiment of the winding support according to the invention, in which the jacket sections run in a shell-like manner from one end ring to the other,

Fig. 7

a detailed view of two adjacent rings and a connecting carrier,

Fig. 8

7 in the axially compressed state,

Fig. 9

a detail section through two superimposed rings and a connecting film layer profiled on the outside.

The winding support according to the embodiment according to FIGS. 1 to 3 has a lower end ring 1 and an upper end ring 2. The upper end ring is provided with an axially projecting collar 3 with a reduced outside diameter. The collar 3 of this winding carrier fits into the lower end ring 1 of an identical winding carrier placed above it. Between the end rings 1 and 2 parallel and co-axially extending jacket sections are provided in the form of rings 4, which are arranged at a distance from one another or at a distance from the respectively adjacent end ring 1, 2. The distances between these rings can vary over the height of the winding carrier.

In this embodiment, the end rings 1, 2 and the rings 4 form a cylindrical winding surface 5. The inner surfaces of the end rings 1, 2 and 4 form a common cylindrical inner surface, which is only protruded radially inward in the radial direction by the collar 3.

There are supporting webs 6 which extend in a straight line from the upper end ring 2 following the collar 3 into the lower end ring 1 and thereby on the Place the inner surfaces of the rings firmly. The supporting webs 6 have the same cross section over their entire length. A cross-sectional reduction in the direction of the lower end ring 1 would also be possible.

The annular gaps between the lower end ring 1 and the adjacent ring 4, between adjacent rings 4 and between the top ring 4 and the upper end ring 2 are partially. covered by a film layer 7. The size of this cover determines the passage area of the winding support, which e.g. is available for a dyeing liquor.

The film layer 7 can, as shown in Fig. 9, be profiled such that its wall thickness is the smallest in the middle of the annular gap. In this way, a kink for the film layer 7 is created, which causes the film layer 7 to bend radially inward when the winding support is axially compressed. The contouring of the film layer 7 is in the illustrated embodiment on its outer surface.

The lower end ring 1 is formed from two partial rings 8, 9, which are coupled by means of rigid support webs 10 and leave through openings 11 between them.

In Fig. 7 two mutually adjacent rings 4 are shown, on which cross-shaped elevations or depressions 30 are placed, which are intended to secure the hold of the yarn on the winding surface. The space between the two rings 4 is partially. closed by a film layer 7, so that passage openings 31 remain.

In the area in which the supporting web 6 is connected to the rings 4, these are provided with bulges 32. These bulges between adjacent rings 4 increase the length over which the supporting web 6 is exposed and is therefore deformable. This improves the formability.

FIG. 8 essentially shows the view according to FIG. 7 after axial compression, the deformed support web 6 determining the axial compressibility of the winding carrier.

The winding support according to the invention is formed in one piece from plastic in the embodiments just described and in all the embodiments yet to be described.

The injection mold for this winding support is formed by a core, not shown, which can be pulled out of the lower end ring 1. Only two mold halves are required for the outer shape.

4 shows a further embodiment of the winding carrier according to the invention, in which a lower end ring 12 and an upper end ring 13 are provided, the latter having an axially projecting collar 14 with a reduced outer diameter and thread reserve groove 15. Here too, spaced rings 16 are provided between the two end rings 12, 13, as was described with reference to the embodiment according to FIGS. 1 to 3. Support webs 16 'are provided which run continuously from the upper end ring 13 following the collar 14 to the lower end ring 12 and are arranged in a helical manner.

The core required for the production of this winding carrier can be pulled out of the lower end ring 12, the straight-line pulling movement being superimposed on a rotary movement corresponding to the helical course of the supporting webs 16 '. As described above, the outer shape can be formed from two mold halves.

The embodiment according to FIG. 5 of the winding support according to the invention differs from that according to FIGS. 1 to 3 only in that the jacket sections are formed by turns 17 of two supporting elements running spirally between a lower end ring 18 and an upper end ring 19. There are supporting webs 20 which in run in a straight line between the end rings 18, 19 and are firmly connected to the inner surfaces of the windings 17.

The embodiment of the winding support according to the invention according to FIG. 6 has a lower end ring 21 and an upper end ring 22. The upper end ring 23 has a thread reserve groove 23. All of the inner surfaces of the end rings 21, 22 lie on a common cylindrical inner surface 24. Between the end rings 21, 22 there are continuously shell-shaped support pieces 25 which are perforated. The inner surfaces of these support pieces 25 lie on the cylindrical inner surface 24. Accordingly, the outer surfaces of the support pieces 25 and the outer surfaces of the end rings 21, 22 likewise lie on a common cylindrical surface and form a winding surface.

A zigzag-shaped gap 26 runs between each of two adjacent supporting pieces 25 in the circumferential direction between the end rings 21, 22. The edges of the supporting pieces 25 adjoining this gap 26 consequently engage in a zigzag shape. Each gap 26 is now assigned a supporting web 27 which runs in a straight line from the upper end ring 22 to the lower end ring 21 and which is guided through the longitudinal center of the zigzag-shaped course of the gap 26, alternately fixed in the axial direction to an inner surface of the one and the other support piece 25 connected.

This configuration of the winding carrier makes it possible to reduce the width of the gaps 26 and thus to reduce the circumference of the winding surface of the winding carrier. In this way, shrinkage can be taken into account.

The support pieces 25 can be broken down in the axial direction into sections which each leave a gap between them and can be fixed in their spacing by further support webs.

The support pieces 25 are provided with through openings 28.

For all of the previously described embodiments, the same applies that the supporting webs run continuously from one end ring to the other with a constant or reducing cross-section, the cross-section of the supporting web projecting fully radially inward beyond the inner surface of this other end ring on this other end ring. The supporting webs sit on a cylindrical or conically widening surface which is formed by the inner surfaces of the jacket sections and end rings.

The winding support according to the invention can be provided with end rings of various designs. These can be designed such that the end rings of adjacent winding carriers engage axially or, as shown in the embodiment according to FIG. 6, abut one another.

In particular, the outer surfaces of the end rings can form a continuous cylindrical or conical winding surface with the remaining jacket sections. It is also possible for an end ring to be provided with a radially projecting collar.

The supporting webs can be rigid and thus fix the distance between adjacent jacket sections in an unchangeable manner. Advantageously, however, the supporting webs are dimensioned such that they deform in the region of the gap between the jacket section when there is axial pressure on the winding carrier, so that the winding carrier is shortened. For this purpose, reference is made to the embodiments according to FIGS. 1 to 5. Likewise, however, it is also possible to work with rigid or circumferentially deformable support webs 27 in accordance with the embodiment according to FIG. 6 in order to be able to yield to a radial shrinkage.

Claims (11)

1. Plastic bobbin carrier for taking up threads and yarns, with a cylindrical or conical shell provided with radial openings which forms a winding surface and with one end ring (1,2;12,13;18,19;21,22) at each end of the shell, whereby the shell is comprised of several shell segments (4;16;17;25) configured at a distance from one another, forming a cylindrical or conical inner shell surface, said segments being joined together by supporting webs (6;16';20;27), characterised in that the supporting webs are continuous webs running in a straight line or helicoidally from one end ring (1,2;12,13;18,19;21,22) to the other, that these webs possess a cross-section which is constant over their entire length or diminishes in one direction, that they rest on the inner surfaces of the shell segments (4;16;17;25), to which they are joined as one piece, and that they protrude radially over the radially inwardmost surface of at least one end ring (1,2;12,13;18,19;21,22).
2. Bobbin carrier in accordance with claim 1, characterised in that the sections of the supporting webs (6;16';20;27) located between two shell segments (4;16;17;25) are ductile.
3. Bobbin carrier in accordance with claim 1 or 2, characterised in that the spaces between the shell segments (4;16;17;25) are partially closed by a film covering (7) in the area of the inner surface of the shell.
4. Bobbin carrier in accordance with claim 3, characterised in that the film covering (7) is profiled on its radially outward-facing side and incorporates zones of reduced flexural strength.
5. Bobbin carrier in accordance with one of the preceding claims, characterised in that the shell segments are parallel rings (4;16), the axes of which coincide with the longitudinal axis of the bobbin carrier.
6. Bobbin carrier in accordance with one of claims 1 to 4, characterised in that the shell segments are constituted by the windings (17) of at least one supporting web (20) running spirally from one end ring (18,19) to the other.
7. Bobbin carrier in accordance with one of the preceding claims, characterised in that the shell segments are bearing units (25) located at a distance from one another in circumferential direction, which mesh together, leaving a gap in circumferential direction, whereby the supporting webs (27) are located on the inner surfaces of the bearing units (25), in the area of the meshing parts of the bearing units.
8. Bobbin carrier in accordance with claim 7, characterised in that each supporting element (25) runs continuously from one end ring (21) to the other (22).
9. Bobbin carrier in accordance with claim 6, characterised in that the supporting elements (25) are divided in axial direction into several spaced sub-elements which are connected by supporting webs.
10. Bobbin carrier in accordance with one of the preceding claims, characterised in that the shell segments (4) incorporate recesses (32) on their mutually facing edges in the area in which a supporting web (6) passes through.
11. Bobbin carrier in accordance with one of the preceding claims, characterised in that the spacing between the shell segments (4;16;17;25) increases and/or decreases as the distance from an end ring (1,2;12,13;18,19;21,22) increases.

Images