EP1163180B1 - Yarn feeder and yarn brake body - Google Patents
Yarn feeder and yarn brake body Download PDFInfo
- Publication number
- EP1163180B1 EP1163180B1 EP00916966A EP00916966A EP1163180B1 EP 1163180 B1 EP1163180 B1 EP 1163180B1 EP 00916966 A EP00916966 A EP 00916966A EP 00916966 A EP00916966 A EP 00916966A EP 1163180 B1 EP1163180 B1 EP 1163180B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- holding
- feeding device
- membrane
- wall thickness
- area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
- B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
- D03D47/361—Drum-type weft feeding devices
- D03D47/364—Yarn braking means acting on the drum
- D03D47/366—Conical
Definitions
- the invention relates to a yarn delivery device specified in the preamble of claim 1 Type and a thread brake body according to the preamble of claim 14.
- the holding membrane is a rubber or plastic ring membrane with a circumferential direction constant wall thickness. Between the holding area of the brake band and arcuate bending zones are provided for the support ring. The holding membrane engages with an apron over the brake band, which is glued to the apron.
- the thread brake body with an axial pre-tensioning force with the brake band against a trigger edge of the storage body. The thread runs over the edge of the trigger and under the brake band, which is a circumferential continuous Braking area defines and with the trigger edge a linear contact area Has.
- the brake band In the passage area of the thread, the brake band forms a sickle-like Space between the trigger edge.
- the crescent-shaped space runs around with the thread.
- the thread also acts on the brake band with a frictional force that causes the brake band to deform locally, which creates waves in the tensile but flexible brake band can.
- the holding membrane that transmits the axial pretensioning force to the brake band follows the working movements of the brake band. From the local deformations of the brake band can vary system pressure at the trigger edge of the storage body result in a non-uniform thread tension curve in the drawn thread leads.
- Thread brake This affects the self-compensation behavior of the Thread brake, which means that the brake band itself by strong thread acceleration increasing thread tension automatically reduces the braking effect, and if the thread tension decreases due to strong thread retardation Braking effect increased in order to maintain a uniform thread tension profile.
- annular holding membrane held outside the holding area connected to an outer support ring concentric with the brake band is.
- the holding membrane has between the support ring and the holding area of the Brake band on a uniform wall thickness in the circumferential direction.
- the invention has for its object a yarn delivery device of the aforementioned Art as well as a thread brake body to improve so that in operation can achieve a tension profile in the drawn thread that is as uniform as possible or undefined deformation processes in the brake band and in the rotating local To minimize the area of the brake band in which the thread between the Brake band and the trigger edge of the memory body passes through.
- the surface areas with reduced wall thickness unexpectedly become the Support of the brake band in the holding membrane improved
- the wall thickness of the Holding membrane or its degree of hardness can be higher than in the known holding membrane, so that the rigidity of the bracket of the brake band is higher, which is the Centering the brake band on the trigger edge also benefits due to the surface areas when pulling the thread, a contralated deformation of the holding membrane reached between the holding area and the support ring at the undefined Deformation of the brake band, which leads to irregularities in the thread tension could lead to being balanced or swallowed.
- This effect shows is that when the thread runs along the inside of the brake band the surface area in the holding membrane at the trigger point with the reduced wall thickness absorbs forces and deforms (e.g.
- the Brake band behaves desirably sluggish because the holding membrane through the surface areas shows sluggish response with reduced wall thickness.
- the important self-compensation effect is even up to the highest thread take-off speeds and provided with difficult thread qualities. Another important one The advantage is that thanks to the reduced wall thickness in the surface areas no breakthroughs occur in which fluff or the thread, in particular when threading into the thread brake, would impose.
- the surface areas are expediently distributed in the circumferential direction, so that they define spring spokes between them which are the main power transmission run from the support ring into the brake band and expediently in the Wall thickness of the holding membrane are formed, the wall thickness in the surface areas is considerably smaller.
- the surface areas with reduced wall thickness form spaces between the spring spokes, these gaps with membrane-like membrane layers are filled in, at least adjacent to the holding area.
- the surface areas can have any shape and a total selectable total of the usable area.
- the holding membrane In order to give the holding membrane a soft, relatively damped spring behavior, the holding membrane should at least between the holding area and the support ring have a bend in which the spring spokes act like a spring and the Transfer forces to the brake band.
- the circumferential widths of the surface areas are expediently different from the original widths of the spring spokes, preferably smaller. However, it would be also possible, the surface areas and the spring spokes in the circumferential direction approximately to train equally far.
- the wall thickness in the surface areas should match the wall thickness in the spring spokes in a ratio of approx. 5: 1. This ratio may differ become.
- Both the surface areas and the spring spokes are expediently shown in approximately radially oriented.
- the thread brake body can thus be independent of the direction of withdrawal of the thread used by the storage body for each direction of withdrawal become. In addition, there is an effective regardless of the thread take-off direction Centering the brake band on the storage body.
- the surface areas and the spring spokes should be form a substantially smooth surface. This is the direction of feed of the thread facing surface ensures that no fluff can get stuck and the thread cannot get caught, even if it is threading touches the surface.
- the surface areas can be reduced Wall thickness in the surface is under a prestress, i.e. that then the Thin-walled membrane layer bridging gaps in one, so to speak stretched condition in one or more directions.
- the bend is expediently reduced by a tapered smooth apron lengthened inside, which supports the brake band on its back and one too nervous or dampens the resilience of the brake band.
- a cantilevered lip can be formed in the holding area, one with the apron open pocket for the brake band limited.
- the brake band could be on the apron can be glued. In most cases, however, it is sufficient that Only insert the brake band into the insert pocket and only through the positive locking lagezusichem. In operation is anyway due to the system voltage of the brake body and the contact between the brake band and the apron the position of the Brake band set.
- the protruding length of the lip could be about 10 to 25% of the brake bandwidth. This facilitates the assembly or the insertion and removal of the Brake band and still ensures proper positioning of the brake band, also when transporting the brake body.
- the areas with reduced wall thickness should be at a short distance start outside of the pocket in which the brake band with its outer edge is positioned.
- the wall thickness of the apron can be smaller than the wall thickness of the spring spokes, however larger than the wall thickness in the surface areas with reduced Wall thickness.
- the holding membrane is expediently made of a one-storey injection molded part a tough elastic plastic such as polyurethane.
- the formation of the for the function of the retaining diaphragm requires the spring spokes, which are separated by gaps should come into effect from each other individually, is technically simple manageable if the gaps between the spring reservoirs are similar to those of a swimming skin are bridged by a thin layer of the holding membrane. This simplifies it the manufacturing process of the holding membrane by injection molding considerably and provides the advantage that the gaps thanks to the webbed energy distribution or to participate in energy consumption and support of the brake band capital.
- a thread delivery device F in Fig. 1 has the task of a thread Y from a not shown To withdraw thread supply (left in Fig. 1), in turns on a stationary Buffer memory body 4 and by a in the yarn delivery device F structurally integrated thread brake B with an almost constant thread tension curve from a textile machine, for example a weaving machine allow.
- a rotary drive 2 for a winding element 2a is provided in a housing 1, the thread, for example by means of signals from a sensor device 3 temporarily stored on the storage body 4 in a sufficient supply size.
- On a housing arm 8 carrying a trigger eyelet 5 is in one for adjustment the braking action adjustable carriage 7, a carrier 6 is provided which has an annular Thread brake body A is held in such a way that it has a brake element shown in FIG. frustoconical brake band S to a rounded trigger edge of the storage body 4 is pressed.
- the thread Y is between the edge of the trigger and pulled through the inner surface of the brake band, with its thread take-off point circulates.
- the thread brake body A shown in FIGS. 2 to 5 with various details has an annular holding membrane M made of rubber or plastic material, e.g. Polyurethane in a transparent setting.
- the holding membrane M is expedient a one-piece injection molded part, with a frustoconical, endless Brake band S, preferably made of a metal alloy, in the interior of the holding membrane M is positioned.
- the holding membrane M could also be made of a composite material exist, e.g. using kevlar.
- Adjacent to one circular holding area 11 extends in the holding membrane M a conical Apron 10 inside, which rests on the back of the brake band S and sewn runs to the inner edge area.
- the holding membrane M is shaped with a generally C-shaped bend L which extends over an approximately 90 ° transition into an outer one, concentric to the brake band S. and shape-changing support ring R passes over. If necessary, the support ring R is an independent one Component. with which the holding membrane M is connected.
- the wall thickness S2 can be wall thickness S1 in the surface areas D or spaces in one Ratio of approx. 5: 1, so that with a wall thickness S2 of approx. 1.0 mm the wall thickness S1 can be approx. 0.2 mm.
- the surface areas D can be oval and be oriented approximately radially to the axis of the thread brake body A, as well as the spring spokes G.
- the surface areas D are in the circumferential direction the same distance as the spring spokes E.
- the widths of the surface areas D could, however also be different (e.g. smaller) from the width of the spring spokes E.
- the surface areas D begin at a distance from the holding area 11 for the brake band S.
- In the holding area 11 there is a circumferential lip 13 which projects freely inward (FIG. 5) integrally formed with the apron 10, an all-round insert pocket open to the inside T forms for the outer edge of the brake band S.
- the cantilever length of the lip 13 corresponds, for example, to a fifth of the width W of the brake band S.
- the insert pocket T lies approximately in the same radial plane as the transition from the ring area 9 in the support ring R.
- the lip 13 could be omitted and the brake band S on the apron 10 be fixed by gluing.
- the radial extent of the ring region 9 of the holding membrane M approximately corresponds the radial extent of the brake band S.
- the wall thickness of the Apron 10 may be less than the wall thickness S2 of the spring spokes, however greater than the wall thickness S1 of the membrane layers G in the surface areas D bridge the gaps between the spring spokes E. In the illustrated Embodiment are the surface areas continuously with the membrane layer G bridges. It would be conceivable to use only the inner end regions of the surface regions D to be bridged with the membrane layers G and open passages on the outside release.
- the geometric shape of the surface areas D with reduced wall thickness S1 can be arbitrary, as well as their distribution and orientation in the ring region 9 of the holding membrane.
- the spring spokes E and the surface areas are expedient D regularly distributed in the circumferential direction.
Abstract
Description
Die Erfindung betrifft ein Fadenliefergerät der im Oberbegriff des Anspruchs 1 angegebenen
Art sowie einen Fadenbremskörper gemäß Oberbegriff des Anspruchs 14.The invention relates to a yarn delivery device specified in the preamble of
Bei einem aus EP-A-0 686 128 bekannten Fadenbremskörper einer Fadenbremse eines Fadenliefergerätes, auf dem Markt unter der Bezeichnung "Flexbrake" bekannt, ist die Haltemembrane eine Gummi- oder Kunststoff-Ringmembrane mit in Umfangsrichtung konstanter Wandstärke. Zwischen dem Haltebereich des Bremsbandes und dem Tragring sind bogenförmige Biegezonen vorgesehen. Die Haltemembrane greift mit einer Schürze über das Bremsband, das an der Schürze festgeklebt ist. Der Fadenbremskörper wird mit axialer Vorspannkraft mit dem Bremsband gegen einen Abzugsrand des Speicherkörpers angelegt. Der Faden läuft beim Abzug über den Abzugsrand und unter dem Bremsband, das eine in Umfangsrichtung kontinuierliche Bremsfläche definiert und mit dem Abzugsrand einen linienförmigen Kontaktbereich hat. Im Durchgangsbereich des Fadens wird das Bremsband unter Bildung eines sichelartigen Zwischenraums vom Abzugsrand abgehoben. Der sichelförmige Zwischenraum läuft mit dem Faden um. Außerdem beaufschlagt der Faden das Bremsband mit einer Reibungskraft, die bewirkt, dass sich das Bremsband lokal verformt, wodurch im an sich zugfesten, aber biegeelastischen Bremsband Wellen entstehen können. Die die axiale Vorspannkraft auf das Bremsband übertragende Haltemembrane folgt den Arbeitsbewegungen des Bremsbandes. Aus den lokalen Verformungen des Bremsbandes kann variierender Anlagedruck am Abzugsrand des Speicherkörpers resultieren, der im abgezogenen Faden zu einem ungleichförmigen Fadenspannungsverlauf führt. Dies beeinträchtigt das Selbstkompensationsverhalten der Fadenbremse, was bedeutet, dass an sich das Bremsband bei durch eine starke Fadenbeschleunigung ansteigender Fadenspannung die Bremswirkung selbsttätig verringert, und bei infolge starker Fadenverzögerung abnehmender Fadenspannung die Bremswirkung erhöht, um ein gleichförmiges Fadenspannungsprofil einzuhalten. In a thread brake body of a thread brake known from EP-A-0 686 128 Thread delivery device, known on the market under the name "Flexbrake", the holding membrane is a rubber or plastic ring membrane with a circumferential direction constant wall thickness. Between the holding area of the brake band and arcuate bending zones are provided for the support ring. The holding membrane engages with an apron over the brake band, which is glued to the apron. The thread brake body with an axial pre-tensioning force with the brake band against a trigger edge of the storage body. The thread runs over the edge of the trigger and under the brake band, which is a circumferential continuous Braking area defines and with the trigger edge a linear contact area Has. In the passage area of the thread, the brake band forms a sickle-like Space between the trigger edge. The crescent-shaped space runs around with the thread. The thread also acts on the brake band with a frictional force that causes the brake band to deform locally, which creates waves in the tensile but flexible brake band can. The holding membrane that transmits the axial pretensioning force to the brake band follows the working movements of the brake band. From the local deformations of the brake band can vary system pressure at the trigger edge of the storage body result in a non-uniform thread tension curve in the drawn thread leads. This affects the self-compensation behavior of the Thread brake, which means that the brake band itself by strong thread acceleration increasing thread tension automatically reduces the braking effect, and if the thread tension decreases due to strong thread retardation Braking effect increased in order to maintain a uniform thread tension profile.
Bei einer aus WO-A-98 38 124 bekannten Fadenbremse für ein Fadenliefergerat ist bei einer Ausführungsform (Fig. 14, 15), das Bremsband mit seiner Rückseite auf einem kegeligen, elastischen Ringkörper schwimmend abgestützt. In der Berührungsfläche des Ringkörpers können in Umfangsrichtung aufeinanderfolgende Erhöhungen und Vertiefungen vorgesehen sein. Bei einer in Fig. 16 gezeigten Ausführungsform ist das Bremsband mit seinem Außenrandbereich in einer umlaufenden Tasche einer elastischen, kreisringförmigen Haltemembrane gehaltert, die außerhalb des Haltebereichs mit einem zum Bremsband konzentrischen, außenliegenden Tragring verbunden ist. Die Haltemembrane weist zwischen dem Tragring und dem Haltebereich des Bremsbandes eine in Umfangsrichtung gleichförmige Wandstärke auf. In a thread brake known from WO-A-98 38 124 for a thread delivery device in one embodiment (Fig. 14, 15), the brake band with its back on a tapered, elastic ring body floating supported. In the interface of the ring body can successive increases in the circumferential direction and recesses may be provided. In one embodiment shown in FIG the brake band with its outer edge area in a circumferential pocket elastic, annular holding membrane held outside the holding area connected to an outer support ring concentric with the brake band is. The holding membrane has between the support ring and the holding area of the Brake band on a uniform wall thickness in the circumferential direction.
Der Erfindung liegt die Aufgabe zugrunde, ein Fadenliefergerät der eingangs genannten Art sowie einen Fadenbremskörper so zu verbessern, dass sich im Betrieb ein möglichst gleichmäßiges Spannungsprofil im abgezogenen Faden erzielen lässt bzw. undefinierte Verformungsvorgänge im Bremsband und in dem umlaufenden lokalen Bereich des Bremsbandes zu minimieren, in dem der Faden zwischen dem Bremsband und dem Abzugsrand des Speicherkörpers durchläuft.The invention has for its object a yarn delivery device of the aforementioned Art as well as a thread brake body to improve so that in operation can achieve a tension profile in the drawn thread that is as uniform as possible or undefined deformation processes in the brake band and in the rotating local To minimize the area of the brake band in which the thread between the Brake band and the trigger edge of the memory body passes through.
Die gestellte Aufgabe wird mit den Merkmalen des Anspruchs 1 und des Anspruchs 14
gelöst.The object is achieved with the features of
Unerwarteterweise wird mit den Flächenbereichen mit verringerter Wandstärke die Abstützung des Bremsbandes in der Haltemembrane verbessert Die Wandstärke der Haltemembrane bzw. ihr Härtegrad können höher sein als bei der bekannten Haltemembrane, so dass die Steifigkeit der Halterung des Bremsbandes höher ist, was der Zentrierung des Bremsbandes auf dem Abzugsrand zugute kommt Außerdem wird durch die Flächenbereiche beim Fadenabzug eine kontrallierte Deformation der Haltemembrane zwischen dem Haltebereich und dem Tragring erreicht, bei der undefinierte Verformungen des Bremsbandes, die zu Unregelmäßigkeiten in der Fadenspannung führen könnten, ausgeglichen oder geschluckt werden. Dieser Effekt zeigt sich darin, dass beim Umlauf des Fadens entlang der Innenseite des Bremsbandes der in der Haltemembrane jeweils beim Abzugspunkt liegende Flächenbereich mit der verringerten Wandstärke Kräfte aufnimmt und sich verformt (z.B. mit Beulen oder Eindrückungen) und so dazu beiträgt, dass sich das Bremsband nicht undefiniert verformt. Der Spannungsverlauf im abgezogenen Faden wird gleichmäßiger. Das Bremsband verhält sich wünschenswert träge, da die Haltemembrane durch die Flächenbereiche mit verringerter Wandstärke ein träges Ansprechverhalten zeigt. Die wichtige Selbstkompensationswirkung wird selbst bis zu höchsten Fadenabzugsgeschwindigkeiten und bei schwierigen Fadenqualitäten erbracht. Ein weiterer wichtiger Vorteil liegt darin, dass dank der verringerten Wandstärke in den Flächenbereichen keine Durchbrüche entstehen, in denen sich Flusen festsetzen oder der Faden, insbesondere beim Einfädeln in die Fadenbremse, verhängen würde. Schließlich sind die Herstellung der Haltemembrane und des nötigen Spritzgusswerkzeuges einfacher, wenn zwecks vorbestimmten Verformungsverhaltens zwischen dem Haltebereich und dem Tragring die das Verformungsverhalten beeinflussenden Flächenbereiche nicht offen, sondem mit verringerter Wandstärke ausgebildet werden. Zweckmäßigerweise sind die Flächenbereiche in.Umfangsrichtung regelmäßig verteilt, so daß sie zwischen sich Federspeichen definieren, die die hauptsächliche Kraftübertragung vom Tragring in das Bremsband ausführen und zweckmäßigerweise in der Wandstärke der Haltemembrane ausgebildet sind, dergegenüber die Wandstärke in den Flächenbereichen erheblich geringer ist. Die Flächenbereiche mit verringerter Wandstärke bilden Zwischenräume zwischen den Federspeichen, wobei diese Zwischenräume mit schwimmhautähnlichen Membranschichten ausgefüllt sind, zumindest angrenzend an den Haltebereich. Die Flächenbereiche können beliebige Form haben und insgesamt einen wählbaren Gesamtanteil der nutzbaren Fläche beanspruchen.The surface areas with reduced wall thickness unexpectedly become the Support of the brake band in the holding membrane improved The wall thickness of the Holding membrane or its degree of hardness can be higher than in the known holding membrane, so that the rigidity of the bracket of the brake band is higher, which is the Centering the brake band on the trigger edge also benefits due to the surface areas when pulling the thread, a contralated deformation of the holding membrane reached between the holding area and the support ring at the undefined Deformation of the brake band, which leads to irregularities in the thread tension could lead to being balanced or swallowed. This effect shows is that when the thread runs along the inside of the brake band the surface area in the holding membrane at the trigger point with the reduced wall thickness absorbs forces and deforms (e.g. with dents or Impressions) and thus helps to ensure that the brake band does not become undefined deformed. The tension curve in the drawn thread becomes more even. The Brake band behaves desirably sluggish because the holding membrane through the surface areas shows sluggish response with reduced wall thickness. The important self-compensation effect is even up to the highest thread take-off speeds and provided with difficult thread qualities. Another important one The advantage is that thanks to the reduced wall thickness in the surface areas no breakthroughs occur in which fluff or the thread, in particular when threading into the thread brake, would impose. After all, they are Manufacture of the holding membrane and the necessary injection molding tool easier, if for the purpose of predetermined deformation behavior between the holding area and the support ring does not affect the surface areas influencing the deformation behavior open, but with a reduced wall thickness. The surface areas are expediently distributed in the circumferential direction, so that they define spring spokes between them which are the main power transmission run from the support ring into the brake band and expediently in the Wall thickness of the holding membrane are formed, the wall thickness in the surface areas is considerably smaller. The surface areas with reduced wall thickness form spaces between the spring spokes, these gaps with membrane-like membrane layers are filled in, at least adjacent to the holding area. The surface areas can have any shape and a total selectable total of the usable area.
Um der Haltemembrane ein weiches, relativ gedämpftes Federverhalten zu verleihen, sollte die Haltemembrane zwischen dem Haltebereich und dem Tragring wenigstens eine Biegung aufweisen, in der die Federspeichen wie Biegefedem wirken und die Kräfte auf das Bremsband übertragen.In order to give the holding membrane a soft, relatively damped spring behavior, the holding membrane should at least between the holding area and the support ring have a bend in which the spring spokes act like a spring and the Transfer forces to the brake band.
Zweckmäßigerweise sind die Umfangsweiten der Flächenbereiche verschieden von den Urnfangsweiten der Federspeichen, vorzugsweise kleiner. Es wäre allerdings auch möglich, die Flächenbereiche und die Federspeichen in Umfangsrichtung in etwa gleich weit auszubilden. The circumferential widths of the surface areas are expediently different from the original widths of the spring spokes, preferably smaller. However, it would be also possible, the surface areas and the spring spokes in the circumferential direction approximately to train equally far.
Die Wandstärke in den Flächenbereichen sollte zur Wandstärke in den Federspeichen in einem Verhältnis von ca. 5 : 1 stehen. Von diesem Verhältnis kann abgewichen werden.The wall thickness in the surface areas should match the wall thickness in the spring spokes in a ratio of approx. 5: 1. This ratio may differ become.
Zweckmäßigerweise sind sowohl die Flächenbereiche als auch die Federspeichen in etwa radial orientiert. Damit kann der Fadenbremskörper unabhängig von der Abzugsrichtung des Fadens vom Speicherköfper für jede Abzugsrichtung verwendet werden. Außerdem ergibt sich unabhängig von der Fadenabzugsrichtung eine effektive Zentrierung des Bremsbandes auf dem Speicherkörper.Both the surface areas and the spring spokes are expediently shown in approximately radially oriented. The thread brake body can thus be independent of the direction of withdrawal of the thread used by the storage body for each direction of withdrawal become. In addition, there is an effective regardless of the thread take-off direction Centering the brake band on the storage body.
An der konvexen Seite der Biegung sollten die Flächenbereiche und die Federspeichen eine im wesentlichen glatte Oberfläche bilden. Diese der Zulaufrichtung des Fadens zugewandte Oberfläche stellt sicher, dass sich keine Flusen festsetzen können und auch der Faden nicht hängen bleiben kann, auch dann nicht, wenn er beim Einfädeln die Oberfläche berührt. Es können die Flächenbereiche mit der verringerten Wandstärke in der Fläche unter einer Vorspannung stehen, d.h., dass dann die die Zwischenräume überbrückende dünnwandige Membranschicht sozusagen in einem in einer oder mehreren Richtung gedehnten Zustand ist.On the convex side of the bend, the surface areas and the spring spokes should be form a substantially smooth surface. This is the direction of feed of the thread facing surface ensures that no fluff can get stuck and the thread cannot get caught, even if it is threading touches the surface. The surface areas can be reduced Wall thickness in the surface is under a prestress, i.e. that then the Thin-walled membrane layer bridging gaps in one, so to speak stretched condition in one or more directions.
Zweckmäßigerweise wird die Biegung durch eine kegelige glattflächige Schürze nach innen verlängert, die das Bremsband an seiner Rückseite abstützt und ein zu nervöses oder lebendiges Federungsverhalten des Bremsbandes dämpft.The bend is expediently reduced by a tapered smooth apron lengthened inside, which supports the brake band on its back and one too nervous or dampens the resilience of the brake band.
Im Haltebereich kann eine auskragende Lippe angeformt sein, die mit der Schürze eine offene Einstecktasche für das Bremsband begrenzt. Das Bremsband könnte an der Schürze festgeklebt werden. In den meisten Fällen reicht es jedoch aus, das Bremsband nur in die Einstecktasche einzusetzen und allein durch den Formschluss lagezusichem. Im Betrieb ist ohnedies durch die Anlagespannung des Bremskörpers und dem Kontakt zwischen dem Bremsband und der Schürze die Position des Bremsbandes festgelegt.A cantilevered lip can be formed in the holding area, one with the apron open pocket for the brake band limited. The brake band could be on the apron can be glued. In most cases, however, it is sufficient that Only insert the brake band into the insert pocket and only through the positive locking lagezusichem. In operation is anyway due to the system voltage of the brake body and the contact between the brake band and the apron the position of the Brake band set.
Dabei könnte die Auskraglänge der Lippe ca. 10 bis 25 % der Bremsbandweite betragen. Dies erleichtert die Montage bzw. das Einsetzen und Herausnehmen des Bremsbandes und sichert trotzdem eine ordnungsgemäße Positionierung des Bremsbandes, auch beim Transport des Bremskörpers.The protruding length of the lip could be about 10 to 25% of the brake bandwidth. This facilitates the assembly or the insertion and removal of the Brake band and still ensures proper positioning of the brake band, also when transporting the brake body.
Die Flächenbereiche mit verringerter Wandstärke sollten in einem kurzen Abstand außerhalb der Einstecktasche beginnen, in der das Bremsband mit seinem Außenrand positioniert ist.The areas with reduced wall thickness should be at a short distance start outside of the pocket in which the brake band with its outer edge is positioned.
Die Wandstärke der Schürze kann kleiner sein als die Wandstärke der Federspeichen, jedoch größer als die Wandstarke in den Flächenbereichen mit verringerter Wandstärke.The wall thickness of the apron can be smaller than the wall thickness of the spring spokes, however larger than the wall thickness in the surface areas with reduced Wall thickness.
Zweckmäßigerweise ist die Haltemembrane ein einstöckiger Spritzgussformteil aus einem zähelastischen Kunststoff wie beispielsweise Polyurethan. Die Formung der für die Funktion der Haltemembrane erforderlichen Federspeichen, die durch Zwischenräume voneinander vereinzelt zur Wirkung kommen sollten, ist förmentechnisch einfach beherrschbar, wenn die Zwischenräume zwischen den Federspeicheri schwimmhautahnlich durch eine dünne Schicht der Haltemembrane überbrückt sind. Dies vereinfacht den Herstellungsprozess der Haltemembrane durch Spritzgießen erheblich und liefert den Vorteil, dass die Zwischenräume dank der Schwimmhäute an der E-nergieverteilung oder Energieaufzehrung und Abstützung des Bremsbandes teilzunehmen vermögen. The holding membrane is expediently made of a one-storey injection molded part a tough elastic plastic such as polyurethane. The formation of the for the function of the retaining diaphragm requires the spring spokes, which are separated by gaps should come into effect from each other individually, is technically simple manageable if the gaps between the spring reservoirs are similar to those of a swimming skin are bridged by a thin layer of the holding membrane. This simplifies it the manufacturing process of the holding membrane by injection molding considerably and provides the advantage that the gaps thanks to the webbed energy distribution or to participate in energy consumption and support of the brake band capital.
Anhand der Zeichnungen wird eine Ausführungsform des Erfindungsgegenstandes erläutert. Es zeigen:
- Fig. 1
- eine schematische Seitenansicht eines Fadenliefergeräts mit einer Fadenbremse,
- Fig. 2
- einen Achsschnitt durch einen Fadenbremskörper, wie er in der Fadenbremse von Fig. 1 verwendet werden kann,
- Fig. 3
- eine Rückansicht des Fadenbremskörpers von Fig. 2,
- Fig. 4
- einen vergrößerten Ausschnitt des Schnitts von Fig. 2, und
- Fig. 5
- einen weiteren vergrößerten Ausschnitt aus Fig. 2.
- Fig. 1
- 1 shows a schematic side view of a thread delivery device with a thread brake,
- Fig. 2
- 3 shows an axial section through a thread brake body, as can be used in the thread brake of FIG. 1,
- Fig. 3
- 3 shows a rear view of the thread brake body from FIG. 2,
- Fig. 4
- an enlarged section of the section of Fig. 2, and
- Fig. 5
- another enlarged detail from FIG. 2.
Ein Fadenliefergerät F in Fig. 1 hat die Aufgabe, einen Faden Y von einem nichtgezeigten
Fadenvorrat (in Fig. 1 links) abzuziehen, in Windungen auf einem stationären
Speicherkörper 4 zwischenzuspeichern und durch eine in das Fadenliefergerät F
baulich integrierte Fadenbremse B mit annähernd gleichbleibendem Fadenspannungsverlauf
von einer Textilmaschine, beispielsweise einer Webmaschine, abziehen
zu lassen. In einem Gehäuse 1 ist ein Drehantrieb 2 für ein Aufwickelelement 2a vorgesehen,
der, beispielsweise mittels Signalen einer Sensorvorrichtung 3, den Faden
in stets ausreichender Vorratsgröße auf dem Speicherkörper 4 zwischenspeichert. An
einem eine Abzugsöse 5 tragenden Gehäuseausleger 8 ist in einem zur Einstellung
der Bremswirkung verstellbaren Schlitten 7 ein Träger 6 vorgesehen, der einen ringförmigen
Fadenbremskörper A derart haltert, dass dieser mit einem in Fig. 2 gezeigten,
kegelstumpfförmigen Bremsband S an einen gerundeten Abzugsrand des Speicherkörpers
4 angedrückt wird. Der Faden Y wird beim Abzug zwischen dem Abzugsrand
und der Innenfläche des Bremsbandes durchgezogen, wobei sein Fadenabzugspunkt
umläuft. A thread delivery device F in Fig. 1 has the task of a thread Y from a not shown
To withdraw thread supply (left in Fig. 1), in turns on a stationary
Der in den Fig. 2 bis 5 mit verschiedenen Details gezeigte Fadenbremskörper A weist
eine kreisringförmige Haltemembrane M aus Gummi- oder Kunststoffmaterial auf, z.B.
Polyurethan in transparenter Einstellung. Die Haltemembrane M ist zweckmäßigerweise
ein einstückiges Spritzgussformteil, wobei ein kegelstumpfförmiges, endloses
Bremsband S, vorzugsweise aus einer Metalllegierung, im Innenbereich der Haltemembrane
M positioniert ist. Die Haltemembrane M könnte auch aus einem Verbundmaterial
bestehen, z.B. unter Verwendung von Kevlar. Angrenzend an einen
kreisförmigen Haltebereich 11 erstreckt sich in der Haltemembrane M eine kegelige
Schürze 10 nach innen, die an der Rückseite des Bremsbandes S anliegt und annähemd
bis zu dessen Innenrandbereich verläuft. Außerhalb des Haltebereiches 11 ist
die Haltemembrane M mit einer im allgemeinen C-förmigen Biegung L geformt, die über
einen annahernd 90°-Übergang in einen äußeren, zum Bremsband S konzentrischen
und formsterfen Tragring R übergeht. Gegebenenfalls ist der Tragring R ein eigenstandiger
Bauteil. mit dem die Haltemembrane M verbunden ist.The thread brake body A shown in FIGS. 2 to 5 with various details has
an annular holding membrane M made of rubber or plastic material, e.g.
Polyurethane in a transparent setting. The holding membrane M is expedient
a one-piece injection molded part, with a frustoconical, endless
Brake band S, preferably made of a metal alloy, in the interior of the holding membrane
M is positioned. The holding membrane M could also be made of a composite material
exist, e.g. using kevlar. Adjacent to one
In der Biegung L liegt ein äußerer Ringbereich 9 der Haltemembrane M vor, der in
Umfangsnchtung verteilte Flächenbereiche D (Fig. 4) mit verringerter Wandstärke S1
enthält. Diese Flachenbereiche D bilden beispielsweise ovale Zwischenräume (Fig. 3)
zwischen in etwa strahlenförmig angeordneten und in den Ringbereich 9 der Haltemembrane
M integnerte Federspeichen E mit der Wandstärke S2. Die Wandstärke
S2 kann zur Wandstarke S1 in den Flächenbereichen D bzw. Zwischenräumen in einem
Verhaltnis von ca. 5 : 1 stehen, so dass bei einer Wandstärke S2 von ca. 1,0 mm
die Wandstarke S1 ca. 0,2 mm sein kann. An der Einlaufseite des Fadens Y unter das
Bremsband S liegt im Ringbereich 9 eine im wesentlichen glatte Oberfläche 12 vor,
während an der Ruckseite im Ringbereich 9 durch die verringerte Wandstärke S1
nutartige Vertiefungen vorhanden sind. Die Flächenbereiche D können oval sein und
in etwa radial zur Achse des Fadenbremskörpers A orientiert sein, wie auch die Federspeichen
G.In the bend L there is an
Bei der gezeigten Ausführungsform sind in Umfangsrichtung die Flächenbereiche D
gleich weit wie die Federspeichen E. Die Weiten der Flächenbereiche D könnten aber
auch verschieden (z.B. kleiner) sein von den Weiten der Federspeichen E. Die Flächenbereiche
D beginnen in einem Abstand vom Haltebereich 11 für das Bremsband
S. Im Haltebereich 11 ist eine umlaufende, nach innen frei auskragende Lippe 13 (Fig.
5) angeformt, die mit der Schürze 10 eine nach innen offene, umlaufende Einstecktasche
T für den Außenrand des Bremsbandes S bildet. Die Auskraglänge der Lippe 13
entspricht beispielsweise einem Fünftel der Breite W des Bremsbandes S. Die Einstecktasche
T liegt in etwa in derselben Radialebene wie der Übergang vom Ringbereich
9 in den Tragring R.In the embodiment shown, the surface areas D are in the circumferential direction
the same distance as the spring spokes E. The widths of the surface areas D could, however
also be different (e.g. smaller) from the width of the spring spokes E. The surface areas
D begin at a distance from the holding
Alternativ könnte die Lippe 13 weggelassen und das Bremsband S an der Schürze 10
durch Kleben befestigt sein.Alternatively, the
Die radiale Erstreckung des Ringbereichs 9 der Haltemembrane M entspricht annähernd
der radial gesehenen Erstreckung des Bremsbandes S. Die Wandstärke der
Schürze 10 kann geringer sein als die Wandstärke S2 der Federspeichen ist, jedoch
größer als die Wandstärke S1 der Membranschichten G, die in den Flächenbereichen
D die Zwischenräume zwischen den Federspeichen E überbrücken. Bei der dargestellten
Ausführungsform sind die Flächenbereiche durchgehend mit der Membranschicht
G überbrückt. Es wäre denkbar, nur die inneren Endbereiche der Flächenbereiche
D mit den Membranschichten G zu überbrücken und außen offene Durchgänge
freizulassen.The radial extent of the
Die geometrische Form der Flächenbereiche D mit verringerter Wandstärke S1 kann
beliebig sein, wie auch ihre Verteilung und Orientierung im Ringbereich 9 der Haltemembrane.
Zweckmäßigerweise sind die Federspeichen E und die Flächenbereiche
D in Umfangsrichtung regelmäßig verteilt.The geometric shape of the surface areas D with reduced wall thickness S1 can
be arbitrary, as well as their distribution and orientation in the
Claims (14)
- Yarn feeding device (F) comprising a stationary storage body (4) and a yarn brake (B) including a ring-shaped braking body (A) axially held against said storage body (4), said braking body (A) consisting of a frustoconical thin walled braking band (S) which at least by its outer edge region is held in an elastic, annular holding membrane (M) made from plastic material, rubber material or compound material, the holding membrane (M) being connected outside of the holding area (11) for said braking band (S) to an outer carrier ring (R) which is concentric to said braking band (S), characterised in that in said holding membrane (M) a plurality of circumferentially distributed area portions (D) having reduced wall thickness (S1) are formed between said carrier ring (R) and said holding area (11) for said braking band (S), said area portions (D) defining spring spokes (E). integrated into said holding membrane (M), and that said area portions (D) are interspaces between said spring spokes (E) each being bridged by a swimskinlike membrane layer (G).
- Yam feeding device as in claim 1, characterised in that said area portions (D) are regularly distributed in circumferential direction.
- Yam feeding device as in claim 1, characterised in that said holding membrane (M) has in its cross-section at least one generally C-shaped bend (L) extending between said holding area (11) and said carrier ring (R).
- Yam feeding device as in claim 1, characterised in that - in circumferential direction - the widths of the area portions (D) differ from the widths of said spring spokes (E), preferably that said widths of said area portions (D) are smaller than the widths of said spring spokes (E).
- Yam feeding device as in claim 1, characterised in that the ratio between the wall thickness (S2) of said spring spokes (E) and the wall thickness (S1) within said membrane layers (G) is about 5:1, e.g. 1.0 mm to 0.2 mm.
- Yam feeding device as in claim 1, characterised in that in viewing direction along the axis of the frustocone of the braking band (S) said spring spokes (E) and said area portions (D) are oriented essentially radially.
- Yam feeding device as in claim 3, characterised in that said spring spokes (E) and said area portions (D) are forming an essentially smooth outer surface (12) at the convex side of said bend (L).
- Yam feeding device as in claim 1, characterised in that said bend (L) is prolonged by a smooth conical skirt (10 terminating close to the inner edge region of said braking band (S).
- Yam feeding device as in claim 1, characterised in that a lip (13) is formed at said holding area (11), said lip (13) extending in circumferential direction and protruding freely inwardly, and that said lip (13) and said skirt (10) define a circular inwards opening insertion pocket (T) for said braking band (S).
- Yam feeding device as in claim 9, characterised in that the protruding length of said lip (13) amounts to about 10% to 25% of the width (W) of said braking band (S).
- Yam feeding device as in claim 9, characterised in that each area portion (D) begins at a distance from said insertion pocket (T) which distance corresponds about to the protruding length of said lip (13).
- Yam feeding device as in claim 8, characterised in that the wall thickness of said skirt (10) is smaller than the wall thickness (S2) of said spring spokes (E) but is larger than the wall thickness (S1) of said membrane layers (G).
- Yam feeding device as in at least one of claims 1 to 12, characterised in that said holding membrane (M) is a one-piece injection moulded part of plastic material, of rubber material or of compound material, preferably from polyurethane, and preferably is at least semi-transparent.
- Yam braking body (A) for a yarn feeding device having a stationary storage body, said yam braking body consisting of a frustoconical thin walled braking band (S) which at least by its outer edge region is held in an elastic, annular holding membrane (M) made from plastic material, rubber material, or compound material, which holding membrane (M) is connected outside of the holding area (11) for said braking band (S) to an outer carrier ring (R) arranged concentrically with respect to said braking band (S), characterised in that in said holding membrane (M) a plurality of circumferentially distributed area portions (D) of reduced wall thickness (S1) is formed between said carrier ring (S) and said holding area (11) for said braking band (S)), defining spring spokes (E) integrated in said holding membrane (M), said area portions (D) being interspaces between said spring spokes (E) each being bridged by a swimskinlike membrane layer (G).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19911943A DE19911943A1 (en) | 1999-03-17 | 1999-03-17 | Thread delivery device and thread brake body |
| DE19911943 | 1999-03-17 | ||
| PCT/EP2000/002362 WO2000055081A1 (en) | 1999-03-17 | 2000-03-16 | Yarn feeder and yarn brake body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1163180A1 EP1163180A1 (en) | 2001-12-19 |
| EP1163180B1 true EP1163180B1 (en) | 2003-05-28 |
Family
ID=7901336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00916966A Expired - Lifetime EP1163180B1 (en) | 1999-03-17 | 2000-03-16 | Yarn feeder and yarn brake body |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6637692B1 (en) |
| EP (1) | EP1163180B1 (en) |
| KR (1) | KR100457304B1 (en) |
| CN (1) | CN1201990C (en) |
| AT (1) | ATE241558T1 (en) |
| DE (2) | DE19911943A1 (en) |
| WO (1) | WO2000055081A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITTO20010260A1 (en) * | 2001-03-20 | 2002-09-20 | Lgl Electronics Spa | SELF-REGULATING BRAKING DEVICE FOR DITRAMA POWER SUPPLIES. |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1133900B (en) * | 1980-10-15 | 1986-07-24 | Roy Electrotex Spa | MEANS FOR BRAKING THE OUTPUT YARN IN CONSTANT AND ADJUSTABLE TENSION FEED DEVICES, PARTICULARLY FOR TEXTILE MACHINES |
| CZ281873B6 (en) * | 1990-03-12 | 1997-03-12 | Iro Ab | Outlet braking system of yarn feed mechanism |
| DE69223575T2 (en) * | 1991-09-20 | 1998-04-16 | Lgl Electronics Spa | Self-regulating thread brake for a weft feed device |
| IT1256329B (en) * | 1992-11-23 | 1995-11-30 | WIRE FEEDING DEVICE | |
| IT1263623B (en) * | 1993-02-23 | 1996-08-27 | Roj Electrotex Nuova Srl | WIRE FEEDER |
| IT1264844B1 (en) | 1993-06-17 | 1996-10-17 | Roj Electrotex Nuova Srl | WIRE FEEDER |
| SE9303266L (en) * | 1993-09-15 | 1995-03-16 | Iro Ab | Weaving machine with projectile or gripper device and feeder device for the weft thread |
| US5546994A (en) * | 1994-10-14 | 1996-08-20 | Sobrevin Societe De Brevets Industriels-Etablissement | Thread storage drum with frustoconical brake strip |
| DE19613055A1 (en) * | 1996-04-01 | 1997-10-02 | Iro Ab | Axial disc brake and thread delivery device with axial disc brake |
| DE19634972A1 (en) * | 1996-08-29 | 1998-03-05 | Iro Ab | Device for braking a thread and thread delivery device |
| SE9700666D0 (en) * | 1997-02-24 | 1997-02-24 | Iro Ab | Fadenliefer device and fade brake |
| ITMI981313A1 (en) * | 1998-06-10 | 1999-12-10 | Roj Electrotex Nuova Srl | BRAKE FOR YARNS ESPECIALLY FOR WEFT FEEDERS |
-
1999
- 1999-03-17 DE DE19911943A patent/DE19911943A1/en not_active Withdrawn
-
2000
- 2000-03-16 CN CNB008063818A patent/CN1201990C/en not_active Expired - Fee Related
- 2000-03-16 WO PCT/EP2000/002362 patent/WO2000055081A1/en active IP Right Grant
- 2000-03-16 EP EP00916966A patent/EP1163180B1/en not_active Expired - Lifetime
- 2000-03-16 KR KR10-2001-7011727A patent/KR100457304B1/en not_active IP Right Cessation
- 2000-03-16 DE DE50002363T patent/DE50002363D1/en not_active Expired - Fee Related
- 2000-03-16 US US09/936,575 patent/US6637692B1/en not_active Expired - Fee Related
- 2000-03-16 AT AT00916966T patent/ATE241558T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR100457304B1 (en) | 2004-11-16 |
| KR20020002403A (en) | 2002-01-09 |
| CN1201990C (en) | 2005-05-18 |
| WO2000055081A1 (en) | 2000-09-21 |
| ATE241558T1 (en) | 2003-06-15 |
| DE19911943A1 (en) | 2000-09-21 |
| DE50002363D1 (en) | 2003-07-03 |
| CN1352617A (en) | 2002-06-05 |
| US6637692B1 (en) | 2003-10-28 |
| EP1163180A1 (en) | 2001-12-19 |
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