EP1277688B1 - Brush brake ring - Google Patents

Description

The invention relates to a bristle brake ring in the preamble of the claim 1 specified type.

Bristle brake rings are used in textile technology, for example on yarn feeding devices used to create a certain tension in the windings on the storage drum To produce the yarn delivery device overhead deducted thread. Of the Bristle brake ring is positioned coaxially to the storage body and with its brush either to the front side, the transition from the front to the outer circumference or possibly even brought into contact with the outer periphery of the storage body, with a certain axial preload, around a contact pressure to produce the bristles. The withdrawn from turns on the storage body Thread runs inside through the bristle brake ring and runs at the same time around the Memory body, wherein it is braked by the brush. The brush consists of individual, usually relatively densely arranged bristles of animal or synthetic nature Material. In many applications, a very low, but constant Tension desired, which can be achieved only with soft bristles. This may be the case in particular on knitting machines or looms. By the frictional contact of the thread to the bristles they are bent, wherein the bristles automatically straighten up again with a new bristle brake ring, However, with increasing service life more and more bent, causing the Decrease braking effect and the thread tension. This wear phenomenon requires the bristle brake ring often adjust or replace. readjusted This is done by axially displacing the carrier to increase the contact pressure of the brush increase. However, this often leads to soft bristles that match the thread material because of the softness of the bristles not to the desired voltage increase. Other, Stiffer bristles, however, no longer match the thread material, so that the Use width of such bristle brake rings is limited due to the material.

The bristle brake ring for a wire-pulley device known from US Pat. No. 3,701,244 A has an embodiment of a rigid annular disk on, on the outer circumference after Externally projecting bristles are attached. The circular disk is between two likewise rigid circular disks are clamped. The rounded outer edge of one rigid annular disk forms a brush formed by the bristles concentric Support element that is contacted by the brush on one side when the Bristles are bent. In another embodiment, the bristles are in one annular retaining member defined between the upper and lower circular plates is clamped. The support element is inelastic.

Another type of brake rings in textile technology are so-called multi-disc brake rings. Instead of a bristle brush is a conical lamellar ring of a Metal foil fastened in the carrier, whose finger-shaped lamellas through gaps are separated from each other and rest on the storage body. In addition to Holding region of the laminated ring in the carrier, a second stationary support ring is provided, which supports the blades near their ends from the outside. Between the Holding area and the support ring are the slats with their insides on the storage body on. With the multi-disc brake ring can be relatively high thread tensions produce. However, the multi-disc brake ring is mechanical for some yarn qualities too coarse.

Finally, hybrid brake rings have been on the market for more than 20 years the contact pressure is generated by a lamellar ring in the carrier and close to the free ends of the slats is supported stationary, and is the coarse effect of the lamellar ring on the thread by a bristle brush also held in the carrier eliminated, which are pressed by the laminar ring against the storage body, and with which the thread comes into contact exclusively. The softness of the bristles is compatible with many thread qualities for which the lamellar ring itself would be too coarse. However, the thread tension that can be generated with such a hybrid brake ring is relatively high and the type of brake ring for sensitive thread qualities or some Multifilament threads not usable.

From DE-A-25 55 802 it is known, two so-called straw rings in the yarn withdrawal direction to put one after another, with the tips of the fingers of one Do not touch Straw Rings the tips of the fingers of the other Straw Ring. To this Way, the braking effect is mathematically doubled. Straw rings, however, are similar circular combs formed with plastic, slanted comb teeth formed and in effect with natural bristles of bristle brake rings not comparable.

The invention is based on the object, a bristle brake ring of the aforementioned To create kind, which has a large application width and with which a set low thread tension over a much longer service life maintained leaves as before.

The stated object is achieved with the features of claim 1.

The bristles of the bristle brake ring produce a uniform, relatively low Thread tension due to frictional contact with the thread. The tendency of the soft Bristles to remain in curved form with increasing service life is however, it is eliminated by the elastic support element that holds the bristles in place in the linear one Thread running direction front outside of the brush is supported. The material of the Support element does not tire. It turns out in practice that with the help of the elastic Support element extends the service life of the bristle brake ring considerably is, if necessary, up to the wear caused by the bristles anyway related exchange the bristle brake ring, without the need in relatively short Reposition the bristle brake ring at intervals. The only supported on the carrier, but inwardly cantilevered support element is in attack on the brush soft and physically no noticeable effect on the between the brush and the thread taking thread braking. It mainly represents the soft ones Bristles back, which would not be able to do so alone. In addition, that has from the carrier outgoing, cantilevered and very elastic at its support diameter Supporting the effect, the contact pressure characteristic of the bristle brake ring steeper to make as it is possible with the bristles alone. It follows that at an adjustment of the bristle brake ring, i. when moving the carrier in Towards the storage body, a more pronounced increase in yarn tension is achievable as without the support element. This gives the bristle brake ring a greater range of use for thread qualities, which only with a certain Bürstenart are compatible. In practice, only certain, usually soft bristles for certain thread qualities suitable. With these bristles can be adjusted by adjusting However, the carrier hardly increase the thread tension. To achieve a little higher Thread tension can also be a bristle brake ring with a different Borstenart be used because the other bristle type no longer fits the thread quality. Due to the support element and the steeper characteristic can now be for a soft on itself Bristle type by adjusting the thread tension increase as with this Bristle was previously not possible. The support element is a lamellar ring of a Metal foil or a plastic film. For example, it consists of a 0.1 to 0.8 mm thick spring steel foil. In the lamellar ring is the large diameter end of a in Circumferentially circumferential ring area provided from the inwardly finger-shaped and separated by gaps separate lamellas projecting freely projecting. The lamellae form the contact surface on the outside of the brush. The Slats can be formed by etching, punching or laser cutting. alternative the support element is a circumferentially closed truncated cone shell a plastic film or an elastomer or rubber membrane. These materials ensure that the support element also in the area of the support diameter is sufficiently elastic. In the truncated cone coat could for weight relief or for the purpose of self-cleaning breakthroughs of any shape may be provided. These Breakthroughs could also the elasticity of the support element in the desired manner participate. In another alternative, the support element has a small diameter Support ring defining the support diameter and an outer, large diameter retaining ring and the two rings connecting spokes, and is a plastic molding. In this case, the brush is essentially only at the support diameter supported.

In an expedient embodiment, the outside of the brush is a truncated cone jacket with a taper in the linear direction of the thread. Also the support member is formed as a truncated cone mantle, which in its large diameter End region is positioned on or in the support ring. The support element is integrated Part of the bristle brake ring, wherein the two cone angles at least can be largely the same, so that the support element always comes into effect, when the truncated cone of the brush is widened. If necessary. the support element is even with supporting bias on the brush.

The lamellae are formed, for example, approximately radially oriented at the ring area or with an inclination relative to a radial orientation. At about radial oriented lamellae can be the bristle brake ring for both directions of rotation of a thread. For slanted slats these should be in the direction of Circumferential movement of the thread in the bristle brake ring be tilted. The bristle brake ring is then appropriate for only one direction of rotation of the thread.

To protect the bristles on the outside of the brush, the slats should be rounded Have ends. All ends together form the support diameter of the Support element.

The lamellar ring is expediently formed from a finely flat lamellar strip, whose ends are connected together. This facilitates the production of the Lamellar ring.

So that the support element can adapt during operation and the desired effect the brush on the thread not falsified, the support element should be stored floating be. So it may possibly. Rotate relative to the carrier and / or the brush.

For easy production of the bristle brake ring, the support element by means of be positioned on its support blocking ring in its supporting position. Of the Blocking ring can be latched or glued to the support to the support element against falling down to itself and transfer the supporting reaction forces into the carrier.

In a further alternative, the carrier is a socket for the large diameter Formed end of the support element and are adjacent to the version several over the circumference of the carrier distributed locking elements for the large diameter end provided the support member positioning blocking ring. In this training the support element can be removed at any time or against another support element replace with other elastic properties and / or dimensions. Furthermore allows each of the above-mentioned positioning principles for the support element, To be able to maintain the proven constructions of conventional bristle brake rings.

Alternatively, the support element could also behind a to the holding portion of the wearer adjacent annular bead be inserted into a socket of the carrier. The elasticity The support element can be used to deform the support element engage and position under the torus. A snap fastening is appropriate.

Fig. 1

eine Perspektivansicht einer Ausführungsform eines Borstenbremsringes,

Fiq. 2

eine Explosionsdarstellung des Borstenbremsrings von Fig. 1 vor dem Zusammenbau,

Fig. 3

eine Perspektivteilansicht einer Ausführungsvariante,

Fig. 4

eine Perspektivteilansicht einer weiteren Ausführungsvariante,

Fig. 5

einen Achsteilschnitt einer weiteren Ausführungsform,

Fig. 6

einen Achsteilschnitt einer weiteren Ausführungsform,

Fig. 7

einen Achsteilschnitt einer weiteren Ausführungsform, und

Fig. 8

eine Frontalansicht eines Teils einer weiteren Ausführungsform eines Borstenbremsrings.

Reference to the drawings, embodiments of the subject invention will be explained. Show it:

Fig. 1

a perspective view of an embodiment of a bristle brake ring,

Fiq. 2

an exploded view of the bristle brake ring of Fig. 1 prior to assembly,

Fig. 3

a partial perspective view of an embodiment variant,

Fig. 4

a partial perspective view of another embodiment,

Fig. 5

an axle section of a further embodiment,

Fig. 6

an axle section of a further embodiment,

Fig. 7

an axle section of another embodiment, and

Fig. 8

a frontal view of a portion of another embodiment of a bristle brake ring.

A bristle brake ring R, in particular for a yarn feeding device of a loom or knitting machine, comprises an annular, dimensionally stable support 3, e.g. a plastic injection molding, in whose inner diameter an annular brush B fixed is. The carrier 3 and the brush B have a common center axis X. The Brush brake ring R is used to generate a predetermined yarn tension in one Thread Y, which passes through the bristle brake ring R in the inner diameter, while in linear direction 1 runs and simultaneously rotates in the direction of an arrow and the Brush B contacted.

For the sake of order, it is pointed out that (FIG. 3) the bristle brake ring R usually on a storage body K generally cylindrical shape of the yarn feeding device coaxial with the axis of the storage body is positioned so that the Brush B in a contact area P with a predetermined axial bias either the front side area of the storage body or its transition (deduction margin) contacted from the front side area in the outer circumference or the outer circumference. The yarn Y is circulated between the storage body K and the brush B. subtracted and braked.

In the carrier 3 is at the vorneliegenden in the linear direction 1 of the yarn Y. Outside A1 of the brush B a circumferential support member S is arranged on the the brush B is supported in a deformation, or if necessary. Basically lighter Preload is supported. In the embodiment shown are on the support 3 in Circumferentially distributed locking elements 4 integrally formed, for example, for fixing serve the carrier 3 in a holder, not shown. The brush B is as a truncated cone formed, which projects from the plane of the carrier 3 in Fig. 1 to the right. The support element S also has a frusto-conical shape and is e.g. through a Blocking L positioned, which is fixed to either the carrier 3, or to the Locking projections 4.

In the embodiment in Fig. 1, the support element S extends only so far inside, that an inner part of the brush B (the bristle tips) adjacent to the inner diameter remains free. The support element S should be approximately in alignment with the Abutment area P (brake gap) free.

The individual parts of the bristle brake ring R of Fig. 1 are in Fig. 2 prior to assembly recognizable. The carrier 3 is a preformed with the brush B and the locking projections 4 Part. The brush B consists of a plurality of elastic bristles 5, e.g. natural Hair or animal bristles or synthetic bristles such as nylon bristles or the like, whose free bristle tips 6 have a e.g. conical inner surface of the Define brush B. The bristles 5 are with their roots 16 (in Fig. 3) in a holding area 17 of the carrier 3 fixed.

The outside A1, on which the support element S is arranged, follows in FIG. 2 right. The support element S is for example a lamellar ring 8 made of a metal or plastic film of small thickness (for example, from a spring steel sheet with a Thickness between 0.1 and 0.8 mm) and has the large-diameter end one circumferentially closed ring portion 9, of which is with the inclination of the ring section 9 extend finger-like lamellae 10 cantilevered away, whose ends are denoted by 11. The ends 11 may be convexly rounded. The slats 10 are separated from each other by gaps 13 and individually bendable. The tips 11 of the blades define a support diameter D, within of which the outside A1 of the brush B remains free up to the bristle tips 6, as this is indicated in Fig. 1.

The blocking ring can be made of plastic or metal. He is at the shown Embodiment a plastic ring 14 with approximately rectangular cross-section. in the Carrier 3 is adjacent to the holding portion 17 of the brush B is a circumferential socket 15 shaped for the large diameter end of the support element S, in front of the Blocking ring L is set. The blocking ring L is locked either in the socket 15 or glued, or on the front side of the carrier 3 and / or with the locking projections 4 locked to the support member S in the position shown in Fig. 1 set. In terms of ticking, the support element is floating in order to adapt Proper motions, e.g. Twist, relative to the carrier 3 and / or the brush B perform to be able to.

In Fig. 3 it can be seen how the bristles 5 of the brush B with their roots 16 in the holding area 17 are defined in the carrier 3. The support element S is located, e.g. full surface, on the outside A1 of the brush B, expediently with a support surface F, the extends up to the support diameter D. The support diameter D leaves a inside part of the brush B up to the bristle tips 6 free. On the carrier 3 is a Ring bead 14 'formed, which serves as a blocking ring L, and behind the large diameter End 18 of the support element S, e.g. of the laminated ring 8 of Fig. 2, snapped is.

In the embodiment in Fig. 4, the blocking ring L is in the form of the plastic ring 14 of Fig. 2 fixed to the front side of the carrier 3, e.g. glued or locked, to set the support element S in the version 15.

The brush B is a truncated cone with a cone angle α with respect to the plane of Carrier 3 is formed such that the brush B in the linear direction of the thread 1 protruding from the plane of the ring of the carrier 3, i. in Fig. 4 to the right. The in the linear yarn direction front outer side A1 is relative to a cone angle α1 inclined to the plane of the carrier 3. This cone angle α1 corresponds at least in about the cone angle α2 of the Stützelemens. The support element S has the form here a truncated cone mantle, which may rest on the outside A1, if necessary. With bias, and which is positioned in the socket 15.

In Fig. 5, the brush B is an approximately radial annulus in the carrier 3, i.e., the brush extends substantially in the plane of the carrier 3. The linear direction of travel 1 of the yarn Y is indicated by an arrow. The support elements S is in the carrier 3rd positioned and extends from the holding range of the brush B in the carrier 3 to the support diameter D.

In the embodiment in Fig. 6, the supporting elements S together with the brush B positioned in the carrier 3, for example by encapsulation. The brush is frustoconical, as well as the support element S. Optionally, the support element S is a continuous truncated cone casing made of a plastic film or an elastomeric or rubber ring membranes, i. Made of a material that works in the direction of Arrows 1 yields elastically, but the brush B resiliently supported and durable resets.

In Fig. 7, the brush B in the carrier 3 is frusto-conical. The support element S is a Circular ring parallel approximately to the plane of the carrier 3 and with its large diameter End 18 positioned in the carrier 3, such that it is the brush B substantially only with his support diameter D acted upon. The support element S could here continuous truncated cone jacket (plastic film or elastic ring membrane) or a lamellar ring 8 as in FIGS. 1 and 2.

In Fig. 8, the support member S is composed of a small diameter Support ring 21, which defines the support diameter D, and a large diameter Retaining ring 19. The two rings 19, 21 are connected to each other via spokes 20. This support element S is for example a plastic molded part and by means of latching projections 4 'of the carrier 3 positioned at this. In this embodiment, the Brush B essentially supported only in the support diameter D.

Basically it is important that the softness and elasticity of the bristles for Brakes remains usable, and the support element in the bristle brake ring structurally possible is simply incorporated so that it prevents the tendency of the bristles themselves to deform with increasing service life by the brush at least set back from the front in the direction of the linear yarn running outside or the bristles are erected near their bristle tips, or the free Bend length of the bristles is shortened so that their braking performance does not deteriorate. In addition, results from the support member S, a steeper spring characteristic of the bristle brake ring R as they would be achievable only with the brush B. A reenactment of the Support 3 in the axial direction of the storage body K (Fig. 3) on the storage body K then increases the contact pressure of the brush more clearly and leads with the same Bristles to a higher thread tension, which can not otherwise be achieved with these bristles would. As a result, the Einatzbreite of the bristle brake ring with only certain Thread qualities, e.g. Multifilament threads, suitable bristle type extended.

Claims (10)

1. Bristle brake ring (R) for a thread (Y) travelling in linear fashion through the bristle brake ring and circulating internally in the bristle brake ring at the same time, in particular for the storage body of a thread delivery device, with an annular carrier (3) in which the roots (16) of a plurality of elastic bristles (5) are retained in a retaining region (17), which bristles project inwards from the retaining region (7) in overhanging fashion and form a circular ring-shaped, optionally conical brush (B) comprising first and second outer faces (A1, A2), and with an elastic encircling support element (S) which is disposed at the front outside (A1), viewed in the linear thread travel direction (1), of the brush (B) and is concentric with the brush, characterised in that the support element (S) is supported at the actual carrier (3) only at least in the vicinity of the retaining region (17) and extends in overhanging fashion as far as the bristle tips (6) at most, and that the support element (S) is either
   a multidisc ring (8) which consists of a metal foil or plastics film and comprises at the large-diameter end a ring region (9), which is continuous in the circumferential direction, and finger-shaped discs (10) which extend freely inwards from the ring region (9) and are separated by interspaces (13),
   or a truncated-cone envelope, which is closed in the circumferential direction, of a plastics film or an elastomer or rubber ring membrane,
   or a small-diameter support ring (21), a large-diameter retaining ring (19) and spokes (20) connecting the rings (21, 19).
2. Bristle brake ring according to Claim 1, characterised in that the outside (A1) of the brush (B) is a truncated-cone envelope, and that the support element (S) is also formed as a truncated-cone envelope.
3. Bristle brake ring according to Claim 2, characterised in that the cone angle (α1, α2) of the two truncated cones are at least largely identical.
4. Bristle brake ring according to Claim 1, characterised in that the discs (10) of the multidisc ring (8) are disposed approximately radially or at an inclination, preferably at an inclination in the direction of circulation (2) of the thread (Y).
5. Bristle brake ring according to Claim 1, characterised in that the discs of the multidisc ring comprise rounded ends (11).
6. Bristle brake ring according to Claim 1, characterised in that the multidisc ring (8) is formed from an open-ended strip, the ends (12) of which are connected together.
7. Bristle brake ring according to Claim 1, characterised in that the support element (S) is disposed in floating fashion at the carrier (3).
8. Bristle brake ring according to Claim 1, characterised in that the support element (S) is positioned by means of a locking ring (L) which is secured to the carrier (3).
9. Bristle brake ring according to Claim 8, characterised in that a mount (15) for the large-diameter end region (18) of the support element (S) is formed at the carrier (3), and that detent elements (4, 4') are provided for the locking ring (L) in or adjacent to the mount (15), preferably for a releasable snap-action fastening of the locking ring (L).
10. Bristle brake ring according to Claim 1, characterised in that the support element (S) is inserted behind an annular bead (14'), adjacent to the retaining region (7), of the carrier (3).

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