EP1666397B1 - Bobbin and in particular a yarn wound bobbin - Google Patents

Abstract

The region (2) carrying the yarn is conical, e.g. with a taper angle (alpha ) relative to the axis (11) of 1.5 to 3 [deg] and has a rough surface. The bottom flange (3) is a truncated cone made in one piece with the yarn region (2) and includes a device for holding the yarn end. This can be an axially sliding ring (9) that can trap the yarn in a slot formed with a cylindrical section (5). The yarn end can also be held on an adhesive surface. The yarn region (2) is formed by a hollow tube, which should deflect no more than 0.1 to 0.2 mm under a yarn winding load (14) of 15 N/mm 2>. The yarn can be precision wound to give a yarn package with a Shore hardness between 60 and 70 [deg].

Description

The present invention relates to a spool, and more particularly to a spool wound with a yarn having the features of the preamble of claim 1.

To yarns and in particular to sewing and embroidery yarns, which are preferably as plain yarns and especially as multifilament yarns of polyester (polyethylene terephthalate), Polyamid6, Polyamid6.6- and / or as blended yarns of the aforementioned synthetic fibers with natural fibers and the construction of a twisted, twisted or cabled yarn have to be supplied to the corresponding sewing or embroidery machines in the course of processing in the confection, it is known to open these sewing or embroidery threads on spools, which are also commonly referred to as foot spools, and to use them accordingly.

The previously described known coils for receiving a Garnvorrates, as for example from the GB-A-1098082 are described, have a cylindrical winding area for the yarn, wherein the relevant yarn is then wound in particular as a cross winding precision winding on the shell of this cylindrical winding area. Furthermore, the known coil is provided with a stand area, so that the coil can be used and stored vertically and thus standing upright during and after use.

Due to the fact that the winding area of the known coil is formed as a cylindrical core, there is often the problem that the wound on the coat of Aufwickelbereiches hochgedrehten or twisted multifilament yarns due to their relatively smooth surface have a poor ply adhesion, which leads to that during the Use of the known coil to move the outer yarn layers relative to the underlying layers. This ply waste may result in partial or complete overlap of the outer yarn layers by the inner yarn layers. This in turn prevents uniform tension of the yarns from the foot spool and, moreover, leads to a jerky withdrawal of the loosened and entangled yarns, which in the end causes yarn breakage and thus a yarn breakage significant production disruption when sewing or embroidery causes.

Except for the previously mentioned on the GB-A-1098082 described known coils which are provided with a cylindrical winding area, describes the US-A-4,165,055 In addition, a coil that has a conical winding area. However, in this known coil shown in FIG. 13, this conical winding area extends over the entire axial length of the coil.

A coil having the features of the preamble of claim 1 is known from DE 297 19 742 U1 known. Here, the known coil on a standing area, a conical winding area and a support member of the yarn end. Furthermore, the known coil is provided with a cylindrical stand portion, which is provided on the foot side at the lower, conically expiring winding area and which is referred to in this document as Spulenfuß. The support member, which is also referred to in this publication as Garnklemme, is designed either as a clamping slot or as applied to the Spulenfußinnenwandung elastic tab, so that in the latter embodiment of the support member to be clamped yarn over the Spulenfuß and below the base of the coil in the Inside the coil base is inserted and fixed there.

The present invention has for its object to provide a particularly stable coil available that undergoes no undesirable positional shift of wound on the winding area yarn layers during transport.

This object is achieved by a coil with the characterizing features of claim 1.

The coil according to the invention for receiving a Garnvorrates has a conical winding area for the yarn and a standing area for the coil, wherein the stand area is associated with at least one support member for fixing the yarn end. Furthermore, the standing area comprises a lower, cylindrical stand portion and a frusto-conical portion formed integrally with the take-up area. The frusto-conical portion is formed such that the conical winding portion penetrates the base circle with the smaller radius of the frusto-conical portion and at least partially penetrates into the interior of the frusto-conical portion, wherein the cylindrical stand portion is axially displaceable relative to the frusto-conical portion such that cylindrical stand portion is formed with the frusto-conical portion of the support member for fixing the yarn end.

The coil according to the invention for accommodating a supply of yarn provides a winding area for the yarn and a standing area for the coil, wherein in the coil according to the invention the winding area is conical and furthermore the holding area is assigned at least one holding element for fixing the yarn end. Due to the fact that the coil according to the invention has a conically configured winding area, the coil according to the invention prevents during the use of the spool and thus during sewing or embroidering the previously described displacement of the yarn layers may occur relative to each other, so that consequently there is no overlap of the inner yarn layers and the outer yarn layers. This, in turn, prevents entanglement of the overlapping or loosened yarns in the yarn package of the present invention. This has the consequence that during the sewing or embroidery process, the yarn can be withdrawn from the coil according to the invention with a constant voltage while avoiding voltage spikes, so that accordingly also interrupted thread breaks and thus process disturbances are avoided. If a yarn change during the production process in the clothing or embroidery are performed, the yarn end can be fixed in the spool to be replaced by the support area associated with the support member, so that in this case the yarn end relative to the next, wound on the jacket of the take-up yarn under Tension is maintained, which then prevents during storage of the corresponding coil used that the unwanted yarn displacement described above takes place. The so-stored coil can then be used without difficulty in a new yarn change again without causing entanglements take place loosened yarn layers. Likewise causes such a fixed yarn end safe transport of the wound coil according to the invention. The coil according to the invention has a number of further advantages. Thus, it should first be noted that when pulling off yarns, especially sewing threads and embroidery threads, always resulting from the wound with these yarn coil according to the invention uniform voltages and for the reasons mentioned above voltage peaks are avoided, which makes first noticeable in a trouble-free production process, ie downtime , caused by yarn breaks, do not occur in the coil according to the invention. Furthermore, the seam pattern or embroidery image is made even more uniform by using the spool wound according to the invention, since in this case an identical yarn length is always made available because of the uniform application of tension when the yarn is pulled off and thus because of this constant tension over the same sewing or embroidery lengths , Because of this homogenization of the peel tension occurs even when using the invention, wound with yarn coil later Boldern or curling of the seams or an undesirable posing zones of embroidery not on, which is particularly clear when the prefabricated or embroidered parts of a later Care treatment, such as a laundry at elevated temperatures or a ironing process, be subjected. Due to the fact that in the coil according to the invention the stand area is assigned at least one support member for fixing the yarn end, a partially processed yarn residue can be particularly safe on the invention Store the bobbin, as this is fixed by the support member, the yarn end and thus the unwanted Garnlagenveränderung initially described in the known coil, ie the overlapping of the outer yarn layers by the inner, arranged above yarn layers, can not occur. Thus, since all yarn layers are always securely fixed both in the processing of the coil according to the invention and in the storage of residual amounts of yarn or during transport on the coil according to the invention, no differences in tension when removing the yarn can occur when using the inventive coil wound with corresponding yarns, so that Even the static charge which occurs due to friction of the yarn on deflecting elements, which in turn leads to charging of the yarn wound on the reel according to the invention, can not cause the spreading and falling of the wound yarn layers, which are promoted by the charging, to occur in the inventive reel.

The particularly secure stability of the coil according to the invention is achieved in that in this case the standing area comprises the lower, cylindrical stand portion and the frustoconical portion cooperating therewith. In particular, the frusto-conical portion located above the cylindrical standing portion constitutes a stiffening element for the winding area attached thereto, thereby ensuring, on the one hand, that the invention Coil has a high stability against mechanical stresses and a good staying power and on the other hand, an unwanted axial displacement of the yarn layers (relative to each other) can not occur.

Since, in the coil of the present invention, the cylindrical stand portion is larger in diameter than the base circle of the frusto-conical portion facing the standing portion, so that the stand portion protrudes radially beyond the bottom base circle of the frusto-conical portion, this projecting portion of the cylindrical stand portion can have a catching area form a yarn end, which always comes into play preferably when a bobbin change is required in the processing of the invention wound with the yarn bobbin.

Furthermore, in the coil according to the invention, the frusto-conical portion is integrally formed with the winding area, such that the conical winding area penetrates the base circle with the smaller radius of the frusto-conical portion and at least partially penetrates into the interior of the frusto-conical portion, thus correspondingly increasing the stability and the stiffening of the winding area is improved. In addition, the coil of the invention can be because of the one-piece Make education of conical winding area and frusto-conical section particularly cheap.

As already stated above, in the coil according to the invention, the conical winding area and the one-piece truncated cone-shaped portion relative to the cylindrical stand portion axially displaceable, such that upon contact of the cylindrical stand portion with the frusto-conical portion, the support member is formed for fixing the yarn end. In other words, the conical take-up portion and the frusto-conical portion are common from a first position in which the cylindrical stand portion is in contact with a lower portion of the frusto-conical portion and thus clampingly holds the yarn end interposed therebetween, and a second position in which this contact described above between a lower part of the frusto-conical portion and the cylindrical stand portion does not exist and in which the securely clamped in the first position yarn end is released, axially displaceable. In this way can be very easily and quickly fix during the non-use of the wound with the yarn according to the invention coil or during transport the relevant yarn or solve the fixation again, as this only an axial displacement of the frusto-conical portion and thus Connected Aufwickelbereiches is required relative to the cylindrical stand section.

For clarity, it should be noted that the terms used above and below conical or frusto-conical always a straight circular cone section or always a straight circular truncated cone, where in the right circular cone section or the straight circular truncated cone two parallel arranged base circles are present such that the lower base circle has a larger diameter in relation to the upper base circle.

In order to make the above-described axial displacement of the cylindrical stand portion on the one hand relative to the frusto-conical portion and the conical Aufwickelbereich integrally connected particularly simple and durable, provides a first embodiment of the coil according to the invention that the diameter of the cylindrical stand portion is greater than the diameter of Base circle with the larger radius of the frusto-conical section. Furthermore, the foot side of the frusto-conical portion provided a radially inwardly set ring member, wherein the cylindrical stand portion has at its frustoconical portion facing the end of a guide member which holds the ring member non-positively and / or positively axially displaceable. In particular, this guide element resiliently biased against the ring member so that it then clamps the ring member over its entire axial shell length when the take-up area and the frusto-conical section connected thereto relative to the stand portion from the first described position to the second position and from the second position to the first position is moved. In order to prevent unwanted loosening of the stand portion of the frusto-conical portion in the axial displacement and thus cancel the force and / or positive engagement previously described, preferably, the guide member or the ring member is provided with a corresponding locking element. Of course, it is also possible to associate a suitably designed guide element the frustoconical portion and a correspondingly cooperating therewith ring member the stand section, wherein also in this embodiment, the ring member and the guide member are in non-positive and / or positive engagement.

Basically, it should be noted with respect to the lateral surface of the conical winding area that the conicity is designed so that the adhesion of the yarn layers described above is ensured. Surprisingly, it has been found that a perfect and secure against slipping of the yarn layers can be achieved in particular when the cone angle α is relatively low, that is, if this Cone angle α in particular between 0.5 ° and 6 ° and preferably between 1.5 ° and 3 ° varies, these cone angles indicate the deviation of the jacket axis in the direction of the central axis. In other words, the winding area is formed so that the radius of the lower base circle, which faces the stand portion, is greater than the radius of the parallel thereto upper base circle, so that accordingly the take-up area tapers conically from the stand portion toward the head side of the coil ,

In order to ensure a particularly secure holding in particular of the first (lower), wound on the winding area yarn layers in the previously described embodiments of the coil according to the invention, which thus can mean a very good basis for a perfect overall winding of the coil with yarn according to the invention, provides an advantageous embodiment the coil according to the invention that in this case the jacket of the conical winding area is provided with a rough surface. In order to provide this rough mantle surface of the conical winding area, in particular the conical winding area can be provided with a corresponding multiplicity of projecting elements, for example punctiform elements, or the mantle surface can be correspondingly roughened or etched by a mechanical or chemical treatment. This also ensures at the same time that at the beginning of winding Of the yarn on the take-up area and thus when creating the first (lower) yarn layer, the yarn can be wound onto the take-up area even without great slippage, even if this yarn has a particularly smooth surface, as is the case in particular with up-turned or twisted and / or coated yarns Yarns is the case.

In order to give the coil according to the invention a relatively low weight, it makes sense to design all coil parts or individual coil parts and in particular the conical winding area and / or the standing area and / or the frustoconical section described above as a hollow body.

A particularly suitable, reduced by the weight and yet the required stability having embodiment of the coil according to the invention provides that in this case the conical winding at a central axial load of 15 N / mm ² a deflection of less than 0.2 mm, preferably one Deflection between 0.2 mm and 0.1 mm, has. Here it has been shown that such a winding area even at extremely high winding tension for producing the wound with yarn coil has the required deformation stiffness, so that from this a perfect wound with yarn coil according to the invention can be created even if the winding area is formed as a hollow body.

As already stated above, the coil is preferably designed as a hollow body to save weight, wherein the coil according to the invention further in addition to the deflection stiffness described above, in particular a ratio of axial length of the Aufwicklungsbereiches to its average diameter between 1: 0.15 to 1 : 0.4. In this case, the mean diameter of the conical winding area is calculated from the sum of the diameters of the lower base circle and the upper base circle, divided by 2.

In order to safely position the coil according to the invention during processing and possibly during storage, an embodiment of the coil according to the invention provides that the conical winding area on the foot and head each have a radially centered element, which is preferably a corresponding ring element or for the case that the winding area is closed foot and head side, is a bore, this centered element serves to receive a mandrel. This mandrel is provided on the corresponding sewing or embroidery machine, so that the coil according to the invention on the mandrel are securely held on the radially centered elements.

The present invention further relates to a with a yarn, in particular with a sewing thread or an embroidery thread of Spool initially wound constructions, so that in this case the winding area is provided with a yarn of the type mentioned above. More particularly, in the wound bobbin according to the invention, the yarn is wound onto the take-up area as an open or closed precision winding, with an open precision winding indicating that there is a small gap between adjacent yarns, whereas a closed precision winding means that adjacent yarns are touching.

It is particularly suitable when the yarn-wound bobbin according to the invention has such a winding area onto which the yarn is wound as a closed precision winding, this closed precision winding between 2 crosses / 4 squares to 8 crosses / 16 squares and in particular 3 crosses / Includes 6 fields. Here, the term crosses / fields, the ratio of the rotational speed of the coil in the winding for thread laying again, the number of crosses per field in particular in a wound, slowly rotating coil, such as a coil, which turns with a rotation of about 5 m / min turns, can be seen on the axial length of the take-up visually recognizable and successive annular areas.

For the application of the sewing yarn and the embroidery yarn, the coil wound according to the invention is preferably wound in such a way that the yarn winding arranged on the winding region has a Shore hardness between 50 ° Sh and 80 ° Sh, in particular between 60 ° Sh and 70 ° Sh.

Basically, it should be noted to the wound coil according to the invention that the conical winding area of the coil is wound in particular with a sewing or embroidery thread, wherein the titer of this sewing or embroidery thread is directed to the respective requirements. Preferably, the denier of the sewing or embroidery yarn wound on the take-up area of the reel according to the invention varies between 30 dtex and 1000 dtex, this sewing or embroidery yarn being in particular a highly twisted, cabled, twisted and / or coated yarn.

A particularly secure holding of the yarn layers against axial displacement on the conical winding area is also achieved in a wound coil according to the invention, when the conical winding area of the coil, depending on the respective denier of the sewing or embroidery yarn wound thereon, with a yarn length between 1,000 m and 10,000 m, preferably between 4,000 m and 8,000 m, is wound.

To avoid repetition, it should be noted that all embodiments of the invention described above, not wound coil identical apply also to the particular wound with a sewing or embroidery thread inventive coil, the only difference of the embodiment described above, the unwrapped coil according to the invention and with A spool of a spool wound according to the invention can be seen in that in the latter, a yarn, in particular a sewing thread or embroidery thread in the manner described above, the construction described above, the previously described titer, the Shore hardness described above and / or or the yarn length described above is wound up.

Preferably, the coil according to the invention is made of plastic.

Advantageous developments of the coil according to the invention or of the wound coil according to the invention are specified in the subclaims.

The invention will be explained in more detail below with reference to an embodiment of the coil in conjunction with the drawing, wherein the single figure of the drawing is a schematic, axially extending sectional view through the coil according to the invention reproduces, without causing the take-up area is wound with a yarn.

The single FIGURE of the drawing schematically illustrates, in section, a coil denoted overall by 1. In this case, the coil has a conically shaped winding area 2 and a stand area, designated overall by 3, wherein the stand area is assigned a holding element 4 for fixing a yarn end (not shown). During the production of a yarn-wound bobbin 1, this yarn, which is preferably a sewing or embroidery yarn, is wound onto the wind-up area 2 in the manner described above as open or closed precision winding.

In the figure, the central axis of the coil 1 is denoted by 11, wherein a parallel to this central axis carries the name 11 a. The conicity of the shell of the take-up is seen relative to the central axis 11 by the angle α, wherein the angle α relative to the straight parallel lines 11 a, which is a parallel to the central axis 11, occupies an angle of 2 °. In other words, therefore, the lateral surface 2 a of the winding area 2 is formed inclined to the central axis 11 by the angle α out.

On the foot side of the coil 1, a specially shaped standing area 3 is provided, which has a lower, cylindrical standing portion 5 and a cooperating frusto-conical section 6.

As the figure can be seen, the frusto-conical portion 6 is formed integrally with the winding area 2, such that the conical winding area 2 axially penetrates the base circle (not shown) with the smaller radius of the frusto-conical portion 6 and thus almost completely in the interior. 7 of the frusto-conical portion 6 is positioned.

In order to achieve a desired axial displacement of the winding region 2 and the frusto-conical section 6 connected thereto in the direction of arrow 8 relative to the standing section 5, the diameter d1 of the cylindrical standing section 5 is made larger than the diameter d2 of the base circle having the larger radius of the frustoconical section 6. Here, the inner diameter d1 and d2 are shown in the drawing. Furthermore, a radially inwardly recessed ring member 9 is provided on the foot side of the frustoconical portion 6, while the cylindrical stand portion has at its frustoconical portion 6 end facing a guide member 10 which is resiliently biased against the ring member 9 and thus the ring member 9 frictionally axially displaceably holds ,

The figure depicts the spool 1 in a position in which the support member 4 does not fix a yarn end (not shown). Now, if such a fixation of the yarn end, for example during transport or the intermediate storage of the coil 1, desired, this yarn end is positioned in contact with the ring member 9 and above the guide member 10, wherein this position is indicated by the reference numeral 12. By an axial displacement of the winding area 2 and the associated frusto-conical portion 6 in the direction of the cylindrical standing portion 5 or by an axial displacement of the cylindrical portion 5 in the direction of the frusto-conical portion 6 and the associated winding area 2 takes place an entrapment of the yarn on the denoted by 12 position and thus the desired fixation of the yarn end.

As the figure shows, the coil 1 is formed as a whole as a hollow body. The take-up area 2 furthermore has a centering element, which is designed as a passage bore 13, at the front end and at the foot, which serves to receive a mandrel of the corresponding sewing or embroidery machine. As a result, the desired fixation of the coil 1 to the corresponding machine during the processing of the wound on the winding area 2 yarn.

If the cylindrical standing section is closed off from its lower surface, then it makes sense to arrange the lower centered element, for example as a passage bore, in this surface.

At a central load, as indicated by the arrow 14, the take-up area 2 has a deflection of 0.15 mm.

Claims (14)

1. A bobbin for receiving a yarn reservoir comprising a conical winding zone for the yarn and a standing area for the bobbin, whereby the standing area is provided with at least one retaining element for fixing the yarn end, and the standing area comprises a lower, cylindrical standing section and a frustro-conical section associated therewith and being constructed in one piece with the winding zone, characterized in that the frustro-conical section (6) is constructed such that the conical winding zone (2) passes through the base circle having the smaller radius of the frustro-conical section (6) and penetrates at least partly into the interior (7) of the frustro-conical section (6), and that the cylindrical standing section (5) is axially displaceable relative to the frustro-conical section (6) so that on contact of the cylindrical standing section (5) with the frustro-conical section (6), the retaining element (4) for fixing the yarn end is formed.
2. The bobbin according to claim 1, characterized in that the diameter (d1) of the cylindrical standing section (5) is greater than the diameter (d2) of the base circle having the larger radius of the frustro-conical section (6), that a radially inwardly directed ring element (9) is provided on the foot side of the frustro-conical section (6) and that the cylindrical standing section (5) is provided with a guide element (10) at its end pointing towards the frustro-conical section (6) which retains the ring element (9) axially (8)displaceably in a force- and/or form-locking fashion.
3. The bobbin according to any one of claims 1 or 2, characterized in that the circumferential shell (2a) of the conical winding zone (2) is formed so that it is inclined at angle α between 0,5° and 6°, preferably between 1,5° and 3° relative to the axis (11, 11a) .
4. The bobbin according to any one of the preceding claims, characterized in that the shell (2a) of the conical winding zone (2) is provided with a rough surface.
5. The bobbin according to any one of the preceding claims, characterized in that the conical winding zone (2) and/or the standing area (3) is embodied as a hollow member.
6. The bobbin according to claim 5, characterized in that under an central axial load (14) of 15 N/mm², the conical winding zone (2) exhibits a deflection of less than 0,2 mm, preferably a deflection between 0,2 mm and 0,1 mm.
7. The bobbin according to any one of the preceding claims, characterized in that the bobbin (1) as a whole is constructed as a hollow member and has a ratio of axial length to average diameter of the winding zone (2) between 1:0,15 till 1:0,4.
8. The bobbin according to any one of the preceding claims, characterized in that the conical winding zone (2) has respectively one radially centered element (13) for receiving a mandrel at the foot and at the head.
9. The bobbin according to any one of the preceding claims, characterized in that the winding zone (2) is provided with a yarn which is wound on the bobbin (1) as an open or closed precision winding.
10. The bobbin according to claim 9, characterized in that the winding zone (2) is provided with the yarn as a closed precision winding, wherein this closed precision winding comprises between 2 crosses/4 sections and 8 crosses/16 sections and especially 3 crosses/6 sections.
11. The bobbin according to any one of claims 9 or 10, characterized in that the Shore hardness of the wound bobbin varies between 50° Sh and 80° Sh, preferably between 60° Sh and 70° Sh.
12. The bobbin according to any one of claims 9 to 11, characterized in that the conical winding zone (2) of the bobbin (1) is wound with a sewing or embroidery thread, wherein the titer of this sewing or embroidery thread varies between 30 dtex and 1000 dtex.
13. The bobbin according to any one of claims 9 to 12, characterized in that the sewing or embroidery thread is a highly twisted or doubled yarn.
14. The bobbin according to any one of claims 9 to 13, characterized in that the conical winding zone (2) of the bobbin (1) is wound with a yarn length between 1000 m and 10,000 m.

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