EP0963335B1 - Thread delivery device and thread brake - Google Patents

Thread delivery device and thread brake Download PDF

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Publication number
EP0963335B1
EP0963335B1 EP98910684A EP98910684A EP0963335B1 EP 0963335 B1 EP0963335 B1 EP 0963335B1 EP 98910684 A EP98910684 A EP 98910684A EP 98910684 A EP98910684 A EP 98910684A EP 0963335 B1 EP0963335 B1 EP 0963335B1
Authority
EP
European Patent Office
Prior art keywords
braking band
brake band
feeding device
braking
band carrier
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
Application number
EP98910684A
Other languages
German (de)
French (fr)
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EP0963335A1 (en
Inventor
Kurt Arne Gunnar Jacobsson
Per Ohlson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iro AB
Original Assignee
Iro AB
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Filing date
Publication date
Application filed by Iro AB filed Critical Iro AB
Publication of EP0963335A1 publication Critical patent/EP0963335A1/en
Application granted granted Critical
Publication of EP0963335B1 publication Critical patent/EP0963335B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00Forwarding filamentary material
    • B65H51/20Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
    • B65H51/22Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34Handling the weft between bulk storage and weft-inserting means
    • D03D47/36Measuring and cutting the weft
    • D03D47/361Drum-type weft feeding devices
    • D03D47/364Yarn braking means acting on the drum
    • D03D47/366Conical

Definitions

  • the invention relates to a thread delivery device according to the preamble of the claim 1 and a thread brake according to the preamble of claim 22.
  • a thread brake known from PCT / EP94 / 00476 on a thread delivery device
  • the brake band is conical in the small diameter end area of a basic train Glued rubber membrane, which encompasses the storage body, with its large diameter End is stored in the stationary support and the brake band pulls with its inside against the trigger edge of the storage body.
  • Thread brakes are widely used on thread delivery devices for projectile and Rapier looms used.
  • the membrane is also a brake band carrier and Spring element that transmits the axial pressing force to the brake band without it to significantly affect local radial deformability.
  • the known thread brake does an extremely desirable job Self-compensation effect by increasing or increasing the pull-off speed of the thread and the thread tension increase caused by this or high thread tension level automatically reduces their braking effect, however, the pressing force of the brake band, which varies in the circumferential direction, can in particular for sensitive thread qualities in modern high-performance weaving machines with high entry frequency and extreme entry speed variations to disturb.
  • a self-regulating thread brake with a radially deformable brake band frustoconical shape is first described in EP-A-0 534 263.
  • the brake band is glued inside in a truncated cone-shaped brake band carrier, the radial deformable, but stiff in the axial direction and in the stationary support a suspension device is axially loaded.
  • the bond area between the brake band and the brake band carrier must be formed precisely and uniformly and can affect the uniform pressure on the brake band.
  • the invention has for its object a yarn delivery device of the aforementioned Kind as well as to create a thread brake for such a thread delivery device, in which while maintaining the important advantage of the self-compensation effect the thread take-up tension level due to varying circumferentially Pressing force can be avoided and the thread brake is easy to manufacture and handle is.
  • a Floating bracket of the brake band means a positive connection, which is a loss the brake band prevented in the absence of attachment to the trigger edge, however there is no integral connection, just a kind of loose securing. This benefits the uniformity of the contact pressure. If the brake band is to be replaced, e.g. due to wear or to adapt to certain thread qualities, then this can be done comfortably.
  • the brake band carrier can continue to be used are and may not need to be removed. With a view to optimal self-centering of the brake band on the trigger edge, it can be advantageous be gimbal-supported and self-centering.
  • the thread brake is inexpensive and easy to manufacture, easy to install and maintain.
  • the contact pressure of the brake band on the trigger edge is thanks the floating bracket optimally, since no material and during transmission the axial preload interfering connection between the brake band carrier and the brake band is provided.
  • the brake band can at least in tangential directions Position relative to the mostly rounded trigger edge, i.e. the brake band is in able to rotate around the axis of the storage body and also towards to move the truncated cone generator or to tip in the braking zone without that the brake band wearer has to go along with these movements or is worth mentioning can inhibit.
  • the floating brake band makes, the difference remains the thread tension between slow and highest thread speeds desirable small because the brake band increases with the thread speed automatically reduces the braking effect.
  • a reduced axial preload that nevertheless leads to a sufficiently high base thread tension, relieves the components the thread brake and leads to a longer service life.
  • investment areas separated by spaces are provided, to a regularly varying braking effect (digital plucking) and to one high base thread tension level even with moderate axial pretension contribute.
  • the contact areas are resilient to local deformability of the brake band during the passage of the circumferential one To interfere with the thread as little as possible.
  • the contact areas are arranged on arms of the brake band carrier.
  • the arms can be resilient. This makes possible a sensitive adjustment of the axial preload to the respective operating conditions.
  • the brake band carrier acts on the brake band in the Braking zone and also in its neighborhood.
  • the handling is improved because the brake band that normally is positioned under the axial pressure, then held captive when the axial pretension has been removed (e.g. for threading the thread, during assembly or when transporting the thread brake).
  • the brake band bracket should enable easy assembly and quick replacement of the brake band, and actually only ensure the required captivity of the brake band.
  • a cleanly controlled entry of the thread into the thread brake is for an optimal Braking effect and the self-compensation effect important.
  • everyone must Pause between entries be sure that the one that has come to a standstill Thread is not caught on the thread brake.
  • this is Task solved by the thread guide, which at the same time an outer brake band holder defined and fixed with the brake band carrier in the support can be. It is obvious that the thread guide is also separate from the Thread brake could be held. Then it may be appropriate to add one Provide brake band bracket on or in the brake band carrier.
  • the axial bias of the brake band to the trigger edge through the axial position of the support to the respective operating requirements customized.
  • the axial bias of the brake band on the trigger edge adjust very sensitively, e.g. with the interposition of a relatively long-stroke Spring device with a favorable characteristic curve.
  • the brake band is inside a truncated cone floating and captive, which forms the brake band carrier.
  • This truncated cone coat could, for example, be made of plastic reinforced with carbon fibers exist, is axially rigid and deformable in the radial direction, and lightweight.
  • the brake band is between the brake band and the brake band carrier Wear element, e.g. in the form of a truncated cone, which the local Deformability of the brake band is affected as little as possible, but wear distributed or minimized between the brake band and the brake band carrier.
  • the wear element could be made of sliding material in order to prevent the movement or floating resistance of the brake band relative to the brake band carrier minimize.
  • the same contact forces are isolated in the circumferential direction Investment areas achieved.
  • the brake band carrier is lightweight and is characterized by low mass, especially in the contact area with the brake band.
  • the arms are approximately in radial planes the axis of the storage body, so that under the deformation movement of the brake band lateral reaction forces of the arms are avoided.
  • the arms can be inclined with respect to radii to the axis be employed, for example to increase the usable arm length or the gaps between the plant areas to reduce or an effective Overlap or overlap of the individual investment areas in the circumferential direction to achieve.
  • the axial bias from the circular coil spring transferred to the brake band.
  • elastically deformable brake band carrier variants are provided, where the floating bracket eliminates annoying adhesive areas, which benefits the uniformity of the pressure in the circumferential direction.
  • these Brake band carrier variants allow the axial preload to be set very sensitively and you can create compact thread brakes.
  • the brake band carrier transmits the axial preload either over a continuous and smooth investment area in the circumferential direction or by means of successive and separate investment areas. In each In this case, the brake band is floating.
  • the brake band in is structurally simple and easy to assemble the one on the brake band carrier, e.g. an elastic ring membrane made of polyurethane, Preformed pocket or several pockets distributed circumferentially captive held.
  • the brake band and the brake band carrier can be due to operational reasons forces acting relative to each other, but the Power transmission from the brake band carrier to the brake band or vice versa ensured is.
  • the ears holding the brake band according to claim 21 are through Slots are formed in the brake band carrier, under which the outer edge of the brake band is inserted. It is expedient for the assembly of the brake band in the two aforementioned embodiments of the brake band bracket a simple Auxiliary tool similar to an anvil used, which with easy handling the Open the bag or bags or raise the ears and the outer edge of the Brake band can be inserted.
  • Thread delivery device F has a drive motor 2 for a winding member in a housing 1 3 on.
  • a drum-shaped storage body 4 is arranged on the housing 1, one of the circumferential continuous, rounded or tapered trigger edge 5 owns.
  • the thread brake B is expediently in a direction Double arrow 6
  • axially adjustable holder 9 supported in a housing bracket 7 is arranged.
  • the holder 9 is an approximately ring-shaped brake band carrier T supported, the in the circumferential direction continuous brake band A in presses against the trigger edge 5 approximately in the axial direction (axis X of the storage body).
  • the brake band is made of a wear-resistant material, for example a metal or a metal alloy with a thickness between 0.01 and 1.0 mm, and has the shape of a truncated cone.
  • the brake band A is at least in Directions resiliently deformable perpendicular to the truncated cone generators, otherwise however tensile.
  • Fig. 1 it is indicated that the brake band carrier T is the brake band A with individual arms C projecting freely in the circumferential direction to the trigger edge 5 presses.
  • the storage body 4 is in this embodiment shown arranged stationary. Alternatively, however, the thread delivery device F could also have one have the axis X rotatable storage body 4. Then it should be ensured that the thread brake C, at least the brake band carrier T, is able to rotate. If necessary, even a rotary drive for the brake band carrier T is then provided.
  • the thread delivery device F according to FIG. 1 is mainly used for gripper or Projectile looms with intermittent weft draw.
  • the thread Y will fed from the left and by means of the winding member 3 in side by side Stored turns on the storage body 4. From each in the direction of deduction the last turn is the thread between the brake band A and the pull-off edge 5 pulled through and further in the direction of the X axis.
  • the current rotates when the trigger is pulled Thread around the take-off edge 5.
  • the take-off angle of the thread Y over the take-off edge 5 corresponds at most to the cone angle of the truncated cone of the brake band A.
  • the brake band A is on the trigger edge 5 and on the brake band carrier T or Poor C floating.
  • a brake band bracket H which if necessary individual holding elements distributed in the circumferential direction, prevents falling out of the brake band A, provided the thread brake B is released or at its Assembly.
  • the brake band holder H is also expediently in the form of a ring Thread guide element L is formed, the entry of the thread into the thread brake B controls and influences or limits the formation of a thread balloon.
  • the brake band carrier is an annular one and basically conical ring membrane M made of rubber or elastomer (e.g. polyurethane), preferably with concentric undulations 10, an outer, dimensionally stable Ring 8, which is supported in the holder 9 as in Fig. 1.
  • the brake band A is in Brake band carrier T is stored and is dropped out by a brake band holder H hindered.
  • the brake band carrier T is an annular chamber 11, preferably a hollow annular chamber 11 with a fluid filling 12.
  • Die Annular chamber 11 is made of elastic material and is in a conical support body 13 arranged, which is fixed in the ring 8 and supported with this in the holder 9 is.
  • the brake band A is floating in the brake band carrier T and is secured by the brake band bracket H against falling out. 2 and 3 the brake band carrier T is continuously in contact with the brake band A in the circumferential direction.
  • the brake band carrier T is fixed with the ring 8 in the holder 9, and points from the ring 8 inwards cantilevered arms, spokes, lamellae or pins 15 on the circumferential direction are separated from one another by intermediate distances 18.
  • Each arm 15 is resilient formed and has a contact area 16 on the brake band A. whose back approximately on a between the inside of the brake band A and the trigger edge 5 formed braking zone Z is aligned.
  • the brake band A is in Circumferential direction and in the direction of its truncated cone generators in the brake band carrier T floating, e.g. even with a game of movement.
  • the thread guide L which can be fixed in the holder 9, defines an inlet gap for the thread and here forms the brake band holder with its inner edge area H.
  • projections 14 can engage in the spaces 18 and the Complete the brake band bracket.
  • the brake band carrier T can be made of plastic and / or metal, e.g. made of resilient sheet metal with individual cut-outs Tongues, be educated.
  • it is possible (indicated by dashed lines) to provide a long-stroke spring device 17 which acts on the ring 8 in the holder 9 and a sensitive adjustment of the axial pressing force for the brake band A enables.
  • the brake band holder H acts with the outer edge 19 of the Brake band A together. But it would also be conceivable, alternatively or additively one Brake band holder (not shown) with the inner edge 20 of the brake band A to work together. If necessary, the investment areas 16 by on the tips of the arms or spring blades 15 applied drops of an elastic or also defined hard material (synthetic resin).
  • the contact surfaces 16 are either flat or slightly curved. The contact areas 16 can extend in the circumferential direction adapted the truncated cone of the brake band A with a concave curvature his.
  • the arms 15 are integrally formed on the ring 8 and consist of metal and / or Plastic. You have an inclined position, e.g. a slightly larger cone tip angle defined as the cone apex angle of the truncated cone of the brake band A.
  • the annular thread guide element L can be a sheet metal or plastic part with a thinner one Wall thickness, which is fixed with its outer edge in a groove 21 of the holder 9 is and at the same time serves to secure the ring 8.
  • An inward end 22 of the thread guide element L forms with tongues 23 which reach between the arms Brake band bracket H.
  • the thread guide element L is at 24 as an additional support body for the arms, Spokes, fingers or spring plates 15 of the brake band carrier T formed the is fixed in the holder 9 by means of the thread guide element L.
  • An internal one Edge region 22 comprises the outer edge of the brake band A and forms the Brake band holder H, so that the brake band A is captive and removable on Brake band carrier T is arranged.
  • Fig. 8 is a sheet metal or plastic molded part with individual arms 15 by means of the thread guide element L defining the ring 8 is fixed in the holder 9, e.g. With a securing element 25.
  • the area 24 of the thread guide element L supports the Arms 15 at a distance from the holder 9 in addition.
  • the inner edge of the Thread guide element L forms the brake band holder H for the floating Brake band A.
  • FIG. 9 and 11 is a conical support body 26 of the brake band carrier on the ring 8 T molded on, which can be intrinsically rigid and in one receptacle 27 supports an annular spiral spring 28, the spring windings 28a (FIG. 10) Define individual contact areas 16 on which the brake band A is mounted.
  • the spring turns 28a of the spiral spring 28 are expediently relative to the spring axis 29 slanted to softer spring detection of the contact areas 16 to achieve.
  • the brake band carrier T simultaneously forms the thread guide element L and the Brake band holder H. In Fig. 11, the inner edge of the brake band A of encompassed the support body 26 with play.
  • The is used for power transmission circular spiral spring 28.
  • An inner bead 30 serves as an additional brake band holder H.
  • the inner bead 30 is by plasma coating or on otherwise designed to be wear-resistant so as not to wear out when it comes into contact with the thread.
  • the coil spring 28 is by holding means, not shown, in the Recording 27 positioned
  • the arms 15 on the ring 8 are bent in an S-shape by a larger spring length to achieve and in the plant areas 16 with approximately perpendicular to the trigger edge 5 directed forces to act.
  • the thread guide element L and the brake band holder H are provided.
  • the brake band A does not touch the contact areas 16 directly, but rather expediently is also interposed frustoconical wear element V on At least one side designed to be slippery or made of slippery and low-wear Material is made. It is conceivable that the wear element V with the Fix brake band bracket H, or over the outer edge and / or the inner edge the brake band A to grip.
  • the brake band carrier T of the thread brake B is a truncated cone jacket 31 made of a material that the truncated cone shell 31 considerable in the axial direction Stiffness gives, but is easily deformable in the radial direction.
  • the brake band A is floating inside in the truncated cone jacket 31; if necessary, are individual Brake band mounts H (noses, ears, or lips) are provided to increase the depth of penetration to limit the brake band A in the truncated cone jacket 31 and / or to prevent it from falling out.
  • the truncated cone jacket 31 is at the small diameter End with a support ring 32 and via a spring device 33 in the axial direction resiliently connected to a stationary support 34, one in the middle Trigger eye 35 has.
  • the spring device 33 is expediently adjustable, around the axial preload of the brake band A on the trigger edge 5 of the storage body 4 to be able to adjust.
  • a suitable material for the truncated cone jacket 31 would be a thin plastic fabric reinforced with carbon fibers.
  • In this case could be an independent thread guide element L (not shown) separate from the thread brake B arranged on the boom 7 of the yarn delivery device F (shown in Fig. 13) become.
  • the brake band carrier T of the thread brake B consists of a truncated cone Ring body 8, 26, which is supported in the holder 9, and from one soft elastomer or rubber or foam, conical ring 36, which is fixed to the ring body 26 and the floating brake band A presses against the trigger edge 5.
  • the thread guide element can also be on the brake band carrier T. L be provided with the brake band holder H so that the brake band A cannot fall out.
  • the resilient ring 36 acts on the brake band A either individual investment areas 16 defining elevations, between which depressions are provided, or with a continuous and smooth in the circumferential direction Investment area 16 '.
  • the floating brake band A In the operation of the thread delivery device, i.e. when pulling and braking the thread Y, can the floating brake band A relative to the brake band carrier T in hold an optimal position, which results from the balance of forces between the axial pressure and the back pressure and the shape of the trigger edge 5 results.
  • the brake band A In the contact area between the brake band carrier T and the brake band A or at the contact areas 16, 16 ', the brake band A can if necessary move both in the direction of the truncated cone generators and in the circumferential direction.
  • Thread Y is withdrawn, with the thread withdrawal point around the trigger edge 5 rotates, then the brake band A is at least at higher thread speeds if necessary, even perform a rotary movement about the axis X, which causes the pressure of the brake band on the trigger edge remains uniform in the circumferential direction and a favorable distribution of wear occurs. That is slower than the thread speed rotating brake band helps to reduce the rotation the thread take-up tension level at, i.e. to favor the self-compensation effect, because the relative speed between the thread take-off point and the brake band is less than the relative speed between the trigger point and the brake band carrier T.
  • the used brake band carrier with arms can be made of spring steel, plastic, die-cast zinc or other material with which resilient arms are achieved to let.
  • the tips of the arms should come off when applying the axial pressure do not bend what is caused by spherical contact areas or applied resin drops is achieved.
  • Steel plates are the arms that act on the brake band expedient and can each taper towards the inner tip to one to achieve soft lace area.
  • the brake band carrier is expediently stored in the stationary support by means of a cardan bracket, so that too the brake band carrier makes a contribution to centering. It can be relative Easy to manufacture plastic or steel designs for the brake band carrier Adjust and adhere to thread tensions up to 30g without any problems.
  • the usual work area such thread brakes include tension values between about 10 and 15g.
  • FIG. 16 is on the existing as an annular membrane M made of elastomeric material Brake band carrier T within an optionally provided undulation 10 the inside is a circumferential pocket 38, which is formed by a over the outer edge of the brake band A engaging, preferably elastic lip 37 is limited.
  • a circumferential lip 37 individual ear-like lip sections could also be used 37 'can be provided, the plurality of pockets 38' distributed over the circumference Define to insert the brake band A.
  • the Brake band carrier T forms a plurality of arcuate slots distributed in the circumferential direction 40 introduced, each of which delimits an ear 39, which over the outer edge of the Brake band engages as soon as it is installed.
  • the lip 37, or the sections 37 ' or the ears 39 of FIGS. 16 to 18 can with elastic pressure on the Brake band A are lying.
  • the extension of the lip 37, 37 'or the ears 39 is expedient so predetermined that under operational stresses in the brake band carrier T or the working movements of the brake band A the outer edge of the Brake band A is unable to release.
  • Three sections 37 'or ears are sufficient 39 in a regular distribution along the circumference of the brake band A. However, a larger number is expediently provided for security reasons.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Braking Arrangements (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Description

Die Erfindung betrifft ein Fadenliefergerät gemäß dem Oberbegriff des Patentanspruchs 1 sowie eine Fadenbremse gemäß dem Oberbegriff des Patentanspruchs 22.The invention relates to a thread delivery device according to the preamble of the claim 1 and a thread brake according to the preamble of claim 22.

Bei einer aus PCT/EP94/00476 bekannten Fadenbremse an einem Fadenliefergerät ist das Bremsband in den kleindurchmeßrigen Endbereich einer im Grundzug konischen Gummimembrane eingeklebt, die den Speicherkörper umgreift, mit ihrem großdurchmeßrigen Ende in der stationären Abstützung gelagert ist und das Bremsband mit seiner Innenseite gegen den Abzugsrand des Speicherkörpers zieht. Derartige Fadenbremsen werden in großem Umfang an Fadenliefergeräten für Projektil- und Greiferwebmaschinen verwendet. Die Membrane ist gleichzeitig Bremsbandträger und Federelement, das die axiale Andrückkraft auf das Bremsband überträgt, ohne dessen lokale radiale Verformbarkeit nennenswert zu beeinträchtigen. Obwohl versucht wird, die Membrane weitgehend homogen zu formen, kann dennoch im Betrieb der Fadenbremse die Andrückkraft des Bremsbandes gegen den Abzugsrand in Umfangsrichtung variieren. Dies ruft unerwünschte Schwankungen im Abzugsspannungsniveau des zwischen der Innenseite des Bremsbandes und dem Abzugsrand hindurchgezogenen und dabei in Umfangsrichtung umlaufenden Fadens hervor. Das Ankleben des Bremsbandes an den Bremsbandträger ist zeitaufwendig und kostenintensiv, wobei auch der Verbindungsbereich eine Inhomogenität entstehen läßt, die eine gleichmäßige Verteilung der Andrückkraft des Bremsbandes entlang der Bremszone beeinträchtigt. Dazu kommt, daß die Reibung des beim Abzug umlaufenden Fadens vom Bremsband auf die Membrane übertragen wird und in dieser eine Verdrehspannung erzeugt, weil die Membrane im großdurchmeßrigen Endbereich in der Abstützung festgelegt ist. Dieser durch den Faden hervorgerufene Effekt kann die Gleichmäßigkeit der Andrückung des Bremsbandes an den Abzugsrand weiter erschweren. Die bekannte Fadenbremse leistet zwar einen außerordentlich wünschenswerten Selbstkompensationseffekt, indem sie bei steigender bzw. hoher Abzugsgeschwindigkeit des Fadens und bereits dadurch bedingtem Fadenspannungsanstieg bzw. hohem Fadenspannungsniveau selbsttätig ihre Bremswirkung verringert, jedoch kann die in Umfangsrichtung variierende Andrückkraft des Bremsbandes, insbesondere bei empfindlichen Fadenqualitäten in modernen Hochleistungswebmaschinen mit hoher Eintragfrequenz und extremen Eintraggeschwindigkeitsvariationen stören.In a thread brake known from PCT / EP94 / 00476 on a thread delivery device the brake band is conical in the small diameter end area of a basic train Glued rubber membrane, which encompasses the storage body, with its large diameter End is stored in the stationary support and the brake band pulls with its inside against the trigger edge of the storage body. Such Thread brakes are widely used on thread delivery devices for projectile and Rapier looms used. The membrane is also a brake band carrier and Spring element that transmits the axial pressing force to the brake band without it to significantly affect local radial deformability. Although tried If the membrane is to be largely homogeneous, the Thread brake the pressing force of the brake band against the trigger edge in the circumferential direction vary. This causes undesirable fluctuations in the level of the trigger voltage between the inside of the brake band and the trigger edge pulled through and thereby revolving in the circumferential direction. The Sticking the brake band to the brake band carrier is time-consuming and costly, the connection area also creates an inhomogeneity, the one even distribution of the pressing force of the brake band along the Braking zone affected. In addition, there is the friction of the rotating one when the trigger Thread is transferred from the brake band to the membrane and in this one Torsion stress is generated because the membrane has a large diameter in the support is fixed. This effect caused by the thread can Even more difficult to evenly press the brake band to the trigger edge. The known thread brake does an extremely desirable job Self-compensation effect by increasing or increasing the pull-off speed of the thread and the thread tension increase caused by this or high thread tension level automatically reduces their braking effect, however, the pressing force of the brake band, which varies in the circumferential direction, can in particular for sensitive thread qualities in modern high-performance weaving machines with high entry frequency and extreme entry speed variations to disturb.

Eine selbstregulierende Fadenbremse mit einem radial verformbaren Bremsband mit kegelstumpfförmiger Gestalt ist erstmals beschrieben in EP-A-0 534 263. Das Bremsband ist innen in einem kegelstumpfförmigen Bremsbandträger festgeklebt, der radial verformbar, jedoch in axialer Richtung steif und in der stationären Abstützung durch eine Federungseinrichtung axial beaufschlagt ist. Der Verklebungsbereich zwischen dem Bremsband und dem Bremsbandträger muß präzis und gleichförmig ausgebildet werden und kann die gleichförmige Anpressung des Bremsbandes beeinträchtigen.A self-regulating thread brake with a radially deformable brake band frustoconical shape is first described in EP-A-0 534 263. The brake band is glued inside in a truncated cone-shaped brake band carrier, the radial deformable, but stiff in the axial direction and in the stationary support a suspension device is axially loaded. The bond area between the brake band and the brake band carrier must be formed precisely and uniformly and can affect the uniform pressure on the brake band.

Bei solchen eine dauerhafte Verbindung zwischen Bremsband und Bremsbandträger aufweisenden Fadenbremsen muß zum Austausch des Bremsbandes der Bremsbandträger mit ausgebaut und ggfs. entsorgt werden.In such a permanent connection between the brake band and brake band carrier having thread brakes to replace the brake band of the brake band carrier removed and disposed of if necessary.

Der Erfindung liegt die Aufgabe zugrunde, ein Fadenliefergerät der eingangs genannten Art sowie eine Fadenbremse für ein solches Fadenliefergerät zu schaffen, bei denen unter Beibehalt des wichtigen Vorteils des Selbstkompensationseffekts eine Beeinflussung des Fadenabzugsspannungsniveaus aufgrund in Umfangsrichtung variierender Andrückkraft vermeidbar und die Fadenbremse einfach herstellbar und handhabbar ist.The invention has for its object a yarn delivery device of the aforementioned Kind as well as to create a thread brake for such a thread delivery device, in which while maintaining the important advantage of the self-compensation effect the thread take-up tension level due to varying circumferentially Pressing force can be avoided and the thread brake is easy to manufacture and handle is.

Die gestellte Aufgabe wird erfindungsgemäß mit den Merkmalen des Patentanspruchs 1 und des Patentanspruchs 22 gelöst.The object is achieved according to the invention with the features of the patent claim 1 and claim 22 solved.

Infolge der schwimmenden Halterung des Bremsbandes entfällt eine arbeits- und kostenintensive Klebeverbindung zwischen dem Bremsband und dem Bremsbandträger. Damit ist die nahezu unvermeidbare Inhomogenität der Klebeverbindung in der Kraftübertragung beseitigt und entsteht eine in Umfangsrichtung gleichförmige bzw. regelmäßige Anpressung des Bremsbandes an den Abzugsrand. Die durch den Fadenumlauf und den Reibungskontakt des Fadens an der Innenseite des Bremsbandes entstehende Drehkraft wird nicht oder nicht in spürbarem Maß in den Bremsbandträger übertragen, so daß auch der negative Einfluß dieser Drehkraft auf die Anpressung des Bremsbandes an den Abzugsrand entfällt. Das Bremsband könnte sich im Betrieb relativ zum Bremsbandträger bewegen, gegebenenfalls sogar drehen. Eine schwimmende Halterung des Bremsbandes bedeutet einen Formschluß, der ein Verlieren des Bremsbandes bei fehlender Anlage am Abzugsrand verhindert, bei dem jedoch keine stoffschlüssige Verbindung vorliegt, sondern nur eine Art loser Sicherung. Dies kommt der Gleichförmigkeit der Anpressung zugute. Ist das Bremsband auszutauschen, z.B. verschleißbedingt oder zur Anpassung an bestimmte Fadenqualitäten, dann läßt sich dies bequem durchführen. Der Bremsbandträger kann weiterverwendet werden und braucht gegebenenfalls nicht ausgebaut zu werden. Im Hinblick auf eine optimale Selbstzentrierung des Bremsbandes auf dem Abzugsrand kann es vorteilhaft sein, den Bremsbandträger kardanisch und selbstzentrierend abzustützen.As a result of the floating mounting of the brake band, there is no labor and cost intensive Adhesive connection between the brake band and the brake band carrier. This is the almost inevitable inhomogeneity of the adhesive connection in the Power transmission eliminated and a circumferential uniform or regular pressing of the brake band on the trigger edge. The through the thread circulation and the frictional contact of the thread on the inside of the brake band The resulting torque is not or not noticeably in the brake band carrier transferred so that the negative influence of this torque on the contact pressure of the brake band to the trigger edge is omitted. The brake band could be move during operation relative to the brake band carrier, possibly even turn. A Floating bracket of the brake band means a positive connection, which is a loss the brake band prevented in the absence of attachment to the trigger edge, however there is no integral connection, just a kind of loose securing. This benefits the uniformity of the contact pressure. If the brake band is to be replaced, e.g. due to wear or to adapt to certain thread qualities, then this can be done comfortably. The brake band carrier can continue to be used are and may not need to be removed. With a view to optimal self-centering of the brake band on the trigger edge, it can be advantageous be gimbal-supported and self-centering.

Die Fadenbremse ist kostengünstig und einfach herstellbar, montage- und wartungsfreundlich. Die Anpreßverhältnisse des Bremsbandes an den Abzugsrand sind dank der schwimmenden Halterung optimal, da keine stoffschlüssige und bei der Übertragung der axialen Vorspannung störende Verbindung zwischen dem Bremsbandträger und dem Bremsband vorgesehen ist.The thread brake is inexpensive and easy to manufacture, easy to install and maintain. The contact pressure of the brake band on the trigger edge is thanks the floating bracket optimally, since no material and during transmission the axial preload interfering connection between the brake band carrier and the brake band is provided.

Gemäß Anspruch 2 kann sich das Bremsband zumindest in tangentialen Richtungen relativ zum zumeist gerundeten Abzugsrand positionieren, d.h., das Bremsband ist in der Lage, sich um die Achse des Speicherkörpers zu drehen und auch in Richtung der Kegelstumpf-Erzeugenden zu versetzen bzw. in der Bremszone zu kippen, ohne daß der Bremsbandträger diese Bewegungen mitzumachen braucht oder nennenswert zu hemmen vermag.According to claim 2, the brake band can at least in tangential directions Position relative to the mostly rounded trigger edge, i.e. the brake band is in able to rotate around the axis of the storage body and also towards to move the truncated cone generator or to tip in the braking zone without that the brake band wearer has to go along with these movements or is worth mentioning can inhibit.

Gemäß Anspruch 3 in bei Abkehr vom gängigen Prinzip eines in Umfangsrichtung gleichförmigen Anlagebereichs des Bremsbandträgers am Bremsband der Vorteil der schwimmenden Halterung des Bremsbandes optimiert. Es wechseln sich in Umfangsrichtung Anlagebereiche mit axialer Anpressung des Bremsbandes mit Bereichen ohne Anpressung oder mit geringerer Anpressung ab. Das Bremsband gleicht die Unterschiede in der Anpressung aufgrund seines elastischen Verhaltens wirkungsvoll aus, insbesondere bei höheren Fadengeschwindigkeiten. Die bei niedrigeren Fadengeschwindigkeiten gegebenenfalls für den Faden spürbaren Unterschiede bei der Anpressung in der Bremszone führen zu dem Vorteil einer relativ hohen Basis-Fadenspannung im Faden bei niedrigen Fadengeschwindigkeiten und bei einer axialen Vorspannung des Bremsbandes, die gegebenenfalls niedriger sein kann als bei in Umfangsrichtung vollständig konstanter Anpressung. Dank des Selbstkompensationseffektes, den das schwimmend gelagerte Bremsband leistet, bleibt der Unterschied der Fadenspannung zwischen langsamen und höchsten Fadengeschwindigkeiten wünschenswert klein, weil das Bremsband mit steigender Fadengeschwindigkeit selbsttätig die Bremswirkung verringert. Eine verminderte axiale Vorspannung, die dennoch zu einer ausreichend hohen Basisfadenspanung führt, entlastet die Komponenten der Fadenbremse und führt zu höherer Standzeit.According to claim 3 in the departure from the usual principle of a circumferential direction uniform contact area of the brake band carrier on the brake band the advantage of Floating bracket of the brake band optimized. It changes in the circumferential direction System areas with axial pressure on the brake band with areas without Pressure or with less pressure. The brake band balances the differences effective due to its elastic behavior off, especially at higher thread speeds. The at lower thread speeds Differences in contact pressure, if any, noticeable for the thread in the braking zone lead to the advantage of a relatively high base thread tension in the thread at low thread speeds and with an axial Preload of the brake band, which may be lower than in Circumferential direction of completely constant pressure. Thanks to the self-compensation effect, the floating brake band makes, the difference remains the thread tension between slow and highest thread speeds desirable small because the brake band increases with the thread speed automatically reduces the braking effect. A reduced axial preload that nevertheless leads to a sufficiently high base thread tension, relieves the components the thread brake and leads to a longer service life.

Gemäß Anspruch 4 sind durch Zwischenräume getrennte Anlagebereiche vorgesehen, die zu einer regelmäßig variierenden Bremswirkung (digital plucking)und zu einem hohen Basisfadenspannungsniveau bereits bei moderater axialer Vorspannung beitragen.According to claim 4, investment areas separated by spaces are provided, to a regularly varying braking effect (digital plucking) and to one high base thread tension level even with moderate axial pretension contribute.

Gemäß Anspruch 5 sind die Anlagebereiche federnd ausgebildet, um die lokalen Deformierbarkeit des Bremsbandes beim Durchgang des in Umfangsrichtung umlaufenden Fadens so wenig wie möglich zu beeinträchtigen.According to claim 5, the contact areas are resilient to local deformability of the brake band during the passage of the circumferential one To interfere with the thread as little as possible.

Gemäß Anspruch 6 sind die Anlagebereiche an Armen des Bremsbandträgers angeordnet. Additiv oder alternativ können die Arme federnd ausgebildet sein. Dies ermöglicht eine feinfühlige Einstellung der axialen Vorspannung an die jeweiligen Betriebsbedingungen.According to claim 6, the contact areas are arranged on arms of the brake band carrier. Additively or alternatively, the arms can be resilient. this makes possible a sensitive adjustment of the axial preload to the respective operating conditions.

Gemäß Anspruch 7 beaufschlagt der Bremsbandträger das Bremsband in der Bremszone und auch in deren Nachbarschaft.According to claim 7, the brake band carrier acts on the brake band in the Braking zone and also in its neighborhood.

Gemäß Anspruch 8 wird die Handhabung verbessert, weil das Bremsband, das normalerweise unter der axialen Anpressung positioniert ist, auch dann unverlierbar gehalten wird, wenn die axiale Vorspannung abgebaut ist (z.B. zum Einfädeln des Fadens, bei der Montage, oder beim Transport der Fadenbremse). Die Bremsbandhalterung soll eine bequeme Montage bzw. den raschen Austausch des Bremsbandes ermöglichen, und eigentlich nur die erforderliche Unverlierbarkeit des Bremsbandes sicherstellen.According to claim 8, the handling is improved because the brake band that normally is positioned under the axial pressure, then held captive when the axial pretension has been removed (e.g. for threading the thread, during assembly or when transporting the thread brake). The brake band bracket should enable easy assembly and quick replacement of the brake band, and actually only ensure the required captivity of the brake band.

Ein sauber gesteuerter Einlauf des Fadens in die Fadenbremse ist für eine optimale Bremswirkung und den Selbstkompensationseffekt wichtig. Außerdem muß in jeder Pause zwischen Eintragvorgängen sichergestellt sein, daß sich der zum Stillstand gekommene Faden nicht an der Fadenbremse verhängt. Gemäß Anspruch 9 wird diese Aufgabe durch das Fadenleitelement gelöst, das gleichzeitig eine äußere Bremsbandhalterung definiert und mit dem Bremsbandträger in der Abstützung festgelegt sein kann. Es liegt auf der Hand, daß das Fadenleitelement auch getrennt von der Fadenbremse gehaltert sein könnte. Dann ist es ggfs. zweckmäßig, zusätzlich eine Bremsbandhalterung am oder im Bremsbandträger vorzusehen.A cleanly controlled entry of the thread into the thread brake is for an optimal Braking effect and the self-compensation effect important. In addition, everyone must Pause between entries, be sure that the one that has come to a standstill Thread is not caught on the thread brake. According to claim 9, this is Task solved by the thread guide, which at the same time an outer brake band holder defined and fixed with the brake band carrier in the support can be. It is obvious that the thread guide is also separate from the Thread brake could be held. Then it may be appropriate to add one Provide brake band bracket on or in the brake band carrier.

Gemäß Anspruch 10 wird die axiale Vorspannung des Bremsbandes an den Abzugsrand durch die axiale Position der Abstützung an die jeweiligen Betriebsanforderungen angepaßt.According to claim 10, the axial bias of the brake band to the trigger edge through the axial position of the support to the respective operating requirements customized.

Gemäß Anspruch 11 läßt sich die axiale Vorspannung des Bremsbandes an den Abzugsrand sehr feinfühlig einstellen, z.B. unter Zwischenschaltung einer relativ langhubigen Federeinrichtung mit günstigem Kennlinienverlauf.According to claim 11, the axial bias of the brake band on the trigger edge adjust very sensitively, e.g. with the interposition of a relatively long-stroke Spring device with a favorable characteristic curve.

Gemäß Anspruch 12 wird das Bremsband im Inneren eines Kegelstumpfmantels schwimmend und unverlierbar gelagert, der den Bremsbandträger bildet. Dieser Kegelstumpfmantel könnte beispielsweise aus mit Karbonfasern verstärktem Kunststoff bestehen, ist axial steif und in radialer Richtung verformbar, und leichtgewichtig.According to claim 12, the brake band is inside a truncated cone floating and captive, which forms the brake band carrier. This truncated cone coat could, for example, be made of plastic reinforced with carbon fibers exist, is axially rigid and deformable in the radial direction, and lightweight.

Gemäß Anspruch 13 ist zwischen das Bremsband und dem Bremsbandträger ein Verschleißelement, z.B. in Form eines Kegelstumpfmantels, eingelegt, das die lokale Verformbarkeit des Bremsbandes so wenig wie möglich beeinträchtigt, jedoch Verschleiß zwischen dem Bremsband und dem Bremsbandträger verteilt oder minimiert. Das Verschleißelement könnte aus gleitfreudigem Material bestehen, um den Bewegungs- oder Schwimmwiderstand des Bremsbandes relativ zum Bremsbandträger zu minimieren. According to claim 13 is between the brake band and the brake band carrier Wear element, e.g. in the form of a truncated cone, which the local Deformability of the brake band is affected as little as possible, but wear distributed or minimized between the brake band and the brake band carrier. The wear element could be made of sliding material in order to prevent the movement or floating resistance of the brake band relative to the brake band carrier minimize.

Gemäß Anspruch 14 werden gleiche Anpreßkräfte in den in Umfangsrichtung vereinzelten Anlagebereichen erzielt. Durch die Ausgestaltung der Arme und deren Materialauswahl läßt sich das Federverhalten optimal vorbestimmen. Der Bremsbandträger ist leichtgewichtig und zeichnet sich durch geringe Massen aus, insbesondere im Berührungsbereich mit dem Bremsband. Die Arme liegen in etwa in Radialebenen um die Achse des Speicherkörpers, so daß unter der Verformungsbewegung des Bremsbandes seitliche Reaktionskräfte der Arme vermieden werden.According to claim 14, the same contact forces are isolated in the circumferential direction Investment areas achieved. Through the design of the arms and their material selection the spring behavior can be optimally predetermined. The brake band carrier is lightweight and is characterized by low mass, especially in the contact area with the brake band. The arms are approximately in radial planes the axis of the storage body, so that under the deformation movement of the brake band lateral reaction forces of the arms are avoided.

Alternativ können die Arme gemäß Anspruch 15 schräg gegenüber Radien zur Achse angestellt sein, beispielsweise um die nutzbare Armlänge zu vergrößern oder die Zwischenräume zwischen den Anlagebereichen zu verkleinern bzw. eine wirkungsmäßige Überlappung oder Überschneidung der einzelnen Anlagebereiche in Umfangsrichtung zu erzielen.Alternatively, the arms can be inclined with respect to radii to the axis be employed, for example to increase the usable arm length or the gaps between the plant areas to reduce or an effective Overlap or overlap of the individual investment areas in the circumferential direction to achieve.

Gemäß Anspruch 16 wird die axiale Vorspannung von der kreisförmigen Spiralfeder auf das Bremsband übertragen. Es werden auf engstem Platz viele gleichförmig wirkende Anlagebereiche geschaffen.According to claim 16, the axial bias from the circular coil spring transferred to the brake band. There will be many uniform appearing in the smallest of spaces Investment areas created.

Gemäß Anspruch 17 wird durch die Schrägstellung der Federwindungen ein weiches Ansprechen der Anlagebereiche erzielt.According to claim 17 is a soft by the inclination of the spring turns Addressing the investment areas achieved.

Gemäß Anspruch 18 sind elastisch verformbare Bremsbandträgervarianten vorgesehen, bei denen dank der schwimmenden Halterung störende Klebebereiche entfallen, was der Gleichförmigkeit der Anpressung in Umfangsrichtung zugute kommt. Mit diesen Bremsbandträgervarianten läßt sich die axiale Vorspannung sehr feinfühlig einstellen und lassen sich kompakte Fadenbremsen schaffen.According to claim 18, elastically deformable brake band carrier variants are provided, where the floating bracket eliminates annoying adhesive areas, which benefits the uniformity of the pressure in the circumferential direction. With these Brake band carrier variants allow the axial preload to be set very sensitively and you can create compact thread brakes.

Gemäß Anspruch 19 überträgt der Bremsbandträger die axiale Vorspannung entweder über einen in Umfangsrichtung kontinuierlichen und glatten Anlagebereich oder mittels aufeinanderfolgender und voneinander getrennter Anlagebereiche. In jedem Fall ist das Bremsband schwimmend gehaltert. According to claim 19, the brake band carrier transmits the axial preload either over a continuous and smooth investment area in the circumferential direction or by means of successive and separate investment areas. In each In this case, the brake band is floating.

Baulich einfach und montagefreundlich wird gemäß Anspruch 20 das Bremsband in der am Bremsbandträger, z.B. einer elastischen Ringmembrane aus Polyurethan, vorgeformten Tasche oder mehreren in Umfangsrichtung verteilten Taschen unverlierbar gehalten. Das Bremsband und der Bremsbandträger können sich unter betriebsbedingt einwirkenden Kräften relativ zueinander bewegen, wobei jedoch die Kraftübertragung vom Bremsbandträger auf das Bremsband bzw. umgekehrt sichergestellt ist.The brake band in is structurally simple and easy to assemble the one on the brake band carrier, e.g. an elastic ring membrane made of polyurethane, Preformed pocket or several pockets distributed circumferentially captive held. The brake band and the brake band carrier can be due to operational reasons forces acting relative to each other, but the Power transmission from the brake band carrier to the brake band or vice versa ensured is.

Alternativ sind die gemäß Anspruch 21 das Bremsband haltenden Ohren durch Schlitze im Bremsbandträger gebildet, unter die der Außenrand des Bremsbandes eingeschoben ist. Zweckmäßigerweise wird für die Montage des Bremsbandes in den beiden vorgenannten Ausführungsformen der Bremsbandhalterung ein einfaches Hilfswerkzeug ähnlich einem Amboss verwendet, der bei bequemer Handhabung die Tasche bzw. Taschen öffnen bzw. die Ohren anheben und den Außenrand des Bremsbandes einführen läßt.Alternatively, the ears holding the brake band according to claim 21 are through Slots are formed in the brake band carrier, under which the outer edge of the brake band is inserted. It is expedient for the assembly of the brake band in the two aforementioned embodiments of the brake band bracket a simple Auxiliary tool similar to an anvil used, which with easy handling the Open the bag or bags or raise the ears and the outer edge of the Brake band can be inserted.

Anhand der Zeichnung werden Ausführungsformen des Erfindungsgegenstandes erläutert. Es zeigen:

Fig. 1
eine schematische Seitenansicht, teilweise im Schnitt, eines mit einer Fadenbremse ausgestatteten Fadenliefergeräts,
Fig. 2+3
Detailvarianten zu Fig. 1,
Fig. 4
einen vergrößerten Längsschnitt einer weiteren Ausführungsvariante,
Fig. 5
eine Ansicht zu Fig. 4, dort von rechts,
Fig.6,7,8
weitere Detailvarianten in vergrößertem Längsschnitt,
Fig.9,11
zwei weitere Detailvarianten im Längsschnitt,
Fig. 10
eine Detailansicht in axialer Richtung zu den Ausführungsformen der Fig. 9 und 11,
Fig. 12
eine weitere Detailvariante in einem Längsschnitt,
Fig. 13
eine weitere Ausführungsform einer Fadenbremse in einem Längschnitt,
Fig. 14
eine weitere Ausführungsform in einem Längsschnitt, und
Fig. 15
eine Schnittansicht in der Ebene XV-XV von Fig. 14 bei gleichzeitiger Andeutung zweier Detailvarianten.
Fig. 16
einen Schnitt einer weiteren Ausführungsform,
Fig. 17
einen Schnitt einer weiteren Ausführungsform, und
Fig. 18
einen Teil einer Axialansicht zu Fig. 17.
Embodiments of the subject matter of the invention are explained with the aid of the drawing. Show it:
Fig. 1
2 shows a schematic side view, partly in section, of a thread delivery device equipped with a thread brake,
Fig. 2 + 3
Detailed variants of Fig. 1,
Fig. 4
3 shows an enlarged longitudinal section of a further embodiment variant,
Fig. 5
4, there from the right,
Fig. 6,7,8
further detail variants in an enlarged longitudinal section,
Fig. 9.11
two further detail variants in longitudinal section,
Fig. 10
9 shows a detailed view in the axial direction of the embodiments of FIGS. 9 and 11,
Fig. 12
another detailed variant in a longitudinal section,
Fig. 13
another embodiment of a thread brake in a longitudinal section,
Fig. 14
another embodiment in a longitudinal section, and
Fig. 15
a sectional view in the plane XV-XV of Fig. 14 with simultaneous indication of two detail variants.
Fig. 16
2 shows a section of a further embodiment,
Fig. 17
a section of a further embodiment, and
Fig. 18
a part of an axial view of FIG. 17th

Ein mit einer, ggfs. eine eigene Baueinheit bildenden, Fadenbremse B ausgestattetes Fadenliefergerät F weist in einem Gehäuse 1 einen Antriebsmotor 2 für ein Aufwikkelorgan 3 auf. Am Gehäuse 1 ist eine trommelförmiger Speicherkörper 4 angeordnet, der einen in Umfangsrichtung kontinuierlichen, gerundeten oder kegeligen Abzugsrand 5 besitzt. Die Fadenbremse B ist in einem zweckmäßigerweise in Richtung eines Doppelpfeiles 6 axial verstellbaren Halter 9 stationär abgestützt, der in einem Gehäuseausleger 7 angeordnet ist. Im Halter 9 ist ein annähernd ringförmger Bremsbandträger T abgestützt, der ein in Umfangsrichtung kontinuierliches Bremsband A in etwa in Axialrichtung (Achse X des Speicherkörpers) gegen den Abzugsrand 5 anpreßt. Das Bremsband besteht aus einem verschleißfesten Material, beispielsweise einem Metall oder einer Metall-Legierung in einer Stärke zwischen 0,01 und 1,0 mm, und hat die Form eines Kegelstumpfmantels. Das Bremsband A ist zumindest in Richtungen senkrecht zu den Kegelstumpf-Erzeugenden federnd verformbar, ansonsten jedoch zugfest. In Fig. 1 ist angedeutet, daß der Bremsbandträger T das Bremsband A mit in Umfangsrichtung frei auskragenden, einzelnen Armen C an den Abzugsrand 5 andrückt. Der Speicherkörper 4 ist bei dieser gezeigten Ausführungsform stationär angeordnet. Alternativ könnte das Fadenliefergerät F jedoch auch einen um die Achse X drehbaren Speicherkörper 4 aufweisen. Dann müßte dafür gesorgt sein, daß sich die Fadenbremse C, zumindest der Bremsbandträger T, zu drehen vermag. Gegebenenfalls ist dann sogar ein Drehantrieb für den Bremsbandträger T vorgesehen.One equipped with a thread brake B, possibly forming its own structural unit Thread delivery device F has a drive motor 2 for a winding member in a housing 1 3 on. A drum-shaped storage body 4 is arranged on the housing 1, one of the circumferential continuous, rounded or tapered trigger edge 5 owns. The thread brake B is expediently in a direction Double arrow 6 axially adjustable holder 9 supported in a housing bracket 7 is arranged. In the holder 9 is an approximately ring-shaped brake band carrier T supported, the in the circumferential direction continuous brake band A in presses against the trigger edge 5 approximately in the axial direction (axis X of the storage body). The brake band is made of a wear-resistant material, for example a metal or a metal alloy with a thickness between 0.01 and 1.0 mm, and has the shape of a truncated cone. The brake band A is at least in Directions resiliently deformable perpendicular to the truncated cone generators, otherwise however tensile. In Fig. 1 it is indicated that the brake band carrier T is the brake band A with individual arms C projecting freely in the circumferential direction to the trigger edge 5 presses. The storage body 4 is in this embodiment shown arranged stationary. Alternatively, however, the thread delivery device F could also have one have the axis X rotatable storage body 4. Then it should be ensured that the thread brake C, at least the brake band carrier T, is able to rotate. If necessary, even a rotary drive for the brake band carrier T is then provided.

Das Fadenliefergerät F gemäß Fig. 1 wird vorwiegend verwendet für Greifer- oder Projektilwebmaschinen mit intermittierendem Schußfadenabzug. Der Faden Y wird von links zugeführt und mittels des Aufwickelorgans 3 in nebeneinanderliegenden Windungen auf dem Speicherkörper 4 abgelegt. Aus der jeweils in Abzugsrichtung letzten Windung wird der Faden zwischen dem Bremsband A und dem Abzugsrand 5 hindurch und weiter in Richtung der Achse X abgezogen. Beim Abzug rotiert der laufende Faden um den Abzugsrand 5. Der Abzugswinkel des Fadens Y über den Abzugsrand 5 entspricht höchstens dem Kegelwinkel des Kegelstumpfes des Bremsbandes A.The thread delivery device F according to FIG. 1 is mainly used for gripper or Projectile looms with intermittent weft draw. The thread Y will fed from the left and by means of the winding member 3 in side by side Stored turns on the storage body 4. From each in the direction of deduction the last turn is the thread between the brake band A and the pull-off edge 5 pulled through and further in the direction of the X axis. The current rotates when the trigger is pulled Thread around the take-off edge 5. The take-off angle of the thread Y over the take-off edge 5 corresponds at most to the cone angle of the truncated cone of the brake band A.

Das Bremsband A ist auf dem Abzugsrand 5 und am Bremsbandträger T bzw. den Armen C schwimmend gelagert. Eine Bremsbandhalterung H, die gegebenenfalls aus einzelnen in Umfangsrichtung verteilten Halteelementen besteht, verhindert das Herausfallen des Bremsbandes A, sofern die Fadenbremse B gelüftet wird oder bei ihrer Montage. Zweckmäßigerweise ist die Bremsbandhalterung H auch als ringförmiges Fadenleitelement L ausgebildet, das den Einlauf des Fadens in die Fadenbremse B steuert und auch dabei das Entstehen eines Fadenballons beeinflußt bzw. begrenzt.The brake band A is on the trigger edge 5 and on the brake band carrier T or Poor C floating. A brake band bracket H, which if necessary individual holding elements distributed in the circumferential direction, prevents falling out of the brake band A, provided the thread brake B is released or at its Assembly. The brake band holder H is also expediently in the form of a ring Thread guide element L is formed, the entry of the thread into the thread brake B controls and influences or limits the formation of a thread balloon.

Bei der Fadenbremse B gemäß Fig. 2 ist der Bremsbandträger eine kreisringförmige und im Grundzug konische Ringmembrane M aus Gummi oder Elastomer (z.B. Polyurethan), vorzugsweise mit konzentrischen Ondulationen 10, einem äußeren, formstabilen Ring 8, der im Halter 9 wie in Fig. 1 abgestützt ist. Das Bremsband A ist im Bremsbandträger T gelagert und wird durch eine Bremsbandhalterung H am Herausfallen gehindert. 2, the brake band carrier is an annular one and basically conical ring membrane M made of rubber or elastomer (e.g. polyurethane), preferably with concentric undulations 10, an outer, dimensionally stable Ring 8, which is supported in the holder 9 as in Fig. 1. The brake band A is in Brake band carrier T is stored and is dropped out by a brake band holder H hindered.

Bei der in Fig. 3 gezeigten Ausführungsform ist der Bremsbandträger T eine Ringkammer 11, vorzugsweise eine hohle Ringkammer 11 mit einer Fluidfüllung 12. Die Ringkammer 11 besteht aus elastischem Material und ist in einem kegeligen Stützkörper 13 angeordnet, der im Ring 8 festgelegt und mit diesem im Halter 9 abgestützt ist. Das Bremsband A ist schwimmend im Bremsbandträger T angeordnet und wird durch die Bremsbandhalterung H gegen Herausfallen gesichert. In den Fig. 2 und 3 liegt der Bremsbandträger T in Umfangsrichtung kontinuierlich am Bremsband A an.In the embodiment shown in FIG. 3, the brake band carrier T is an annular chamber 11, preferably a hollow annular chamber 11 with a fluid filling 12. Die Annular chamber 11 is made of elastic material and is in a conical support body 13 arranged, which is fixed in the ring 8 and supported with this in the holder 9 is. The brake band A is floating in the brake band carrier T and is secured by the brake band bracket H against falling out. 2 and 3 the brake band carrier T is continuously in contact with the brake band A in the circumferential direction.

Fig. 4 und 5 repräsentieren Details der Fadenbremse B gemäß Fig. 1. Der Bremsbandträger T ist mit dem Ring 8 im Halter 9 festgelegt, und weist vom Ring 8 nach innen frei auskragende Arme, Speichen, Lamellen oder Stifte 15 auf, die in Umfangsrichtung voneinander durch Zwischenabstände 18 getrennt sind. Jeder Arm 15 ist federnd ausgebildet und weist einen Anlagebereich 16 auf, der am Bremsband A an dessen Rückseite in etwa auf eine zwischen der Innenseite des Bremsbandes A und dem Abzugsrand 5 gebildete Bremszone Z ausgerichtet ist. Das Bremsband A ist in Umfangsrichtung und in Richtung seiner Kegelstumpf-Erzeugenden im Bremsbandträger T schwimmend, z.B. sogar mit einem Bewegungspiel, gehalten. Das Fadenleitelement L, das in dem Halter 9 festgelegt sein kann, definiert einen Einlaufspalt für den Faden und bildet hier mit seinem inneren Randbereich die Bremsbandhalterung H. Zusätzlich können Vorsprünge 14 in die Zwischenräume 18 eingreifen und die Bremsbandhalterung vervollständigen. Der Bremsbandträger T kann aus Kunststoff und/oder Metall, z.B. aus federndem Metallblech mit einzelnen ausgeschnittenen Zungen, gebildet sein. Die axiale Vorspannung, die der Bremsbandträger T auf das Bremsband A überträgt, läßt sich dank der Federung der Arme 15 z.B. einstellen durch die axiale Position des Halters 9. Alternativ ist es möglich (gestrichelt angedeutet) eine langhubige Federeinrichtung 17 vorzusehen, die den Ring 8 im Halter 9 beaufschlagt und eine feinfühlige Einstellung der axialen Andrückkraft für das Bremsband A ermöglicht.4 and 5 represent details of the thread brake B according to FIG. 1. The brake band carrier T is fixed with the ring 8 in the holder 9, and points from the ring 8 inwards cantilevered arms, spokes, lamellae or pins 15 on the circumferential direction are separated from one another by intermediate distances 18. Each arm 15 is resilient formed and has a contact area 16 on the brake band A. whose back approximately on a between the inside of the brake band A and the trigger edge 5 formed braking zone Z is aligned. The brake band A is in Circumferential direction and in the direction of its truncated cone generators in the brake band carrier T floating, e.g. even with a game of movement. The thread guide L, which can be fixed in the holder 9, defines an inlet gap for the thread and here forms the brake band holder with its inner edge area H. In addition, projections 14 can engage in the spaces 18 and the Complete the brake band bracket. The brake band carrier T can be made of plastic and / or metal, e.g. made of resilient sheet metal with individual cut-outs Tongues, be educated. The axial preload that the brake band carrier T on the Brake band A transmits, thanks to the suspension of the arms 15 e.g. to adjust by the axial position of the holder 9. Alternatively, it is possible (indicated by dashed lines) to provide a long-stroke spring device 17 which acts on the ring 8 in the holder 9 and a sensitive adjustment of the axial pressing force for the brake band A enables.

In den Fig. 4 und 5 wirkt die Bremsbandhalterung H mit dem Außenrand 19 des Bremsbandes A zusammen. Es wäre aber auch denkbar, alternativ oder additiv eine (nicht gezeigte) Bremsbandhalterung mit dem inneren Rand 20 des Bremsbandes A zusammenwirken zu lassen. Gegebenenfalls werden die Anlagebereiche 16 durch auf die Spitzen der Arme oder Federlamellen 15 aufgebrachte Tropfen eines elastischen oder auch harten Materials (Kunstharz) definiert. Die Anlageflächen 16 sind entweder eben oder leicht gekrümmt. In Umfangsrichtung können die Anlagebereiche 16 an den Kegelstumpfmantel des Bremsbandes A mit einer konkaven Wölbung angepaßt sein.4 and 5, the brake band holder H acts with the outer edge 19 of the Brake band A together. But it would also be conceivable, alternatively or additively one Brake band holder (not shown) with the inner edge 20 of the brake band A to work together. If necessary, the investment areas 16 by on the tips of the arms or spring blades 15 applied drops of an elastic or also defined hard material (synthetic resin). The contact surfaces 16 are either flat or slightly curved. The contact areas 16 can extend in the circumferential direction adapted the truncated cone of the brake band A with a concave curvature his.

In Fig. 6 sind die Arme 15 am Ring 8 angeformt und bestehen aus Metall und/oder Kunststoff. Sie haben eine Schräglage, die z.B. einen geringfügig größeren Kegelspitzenwinkel definiert als den Kegelspitzenwinkel des Kegelstumpfes des Bremsbandes A. Das ringförmige Fadenleitelement L kann ein Blech- oder Kunststoffteil mit dünner Wandstärke sein, das mit seinem Außenrand in einer Nut 21 des Halters 9 festgelegt ist und gleichzeitig zur Sicherung des Ringes 8 dient. Ein nach innen stehendes Ende 22 des Fadenleitelementes L bildet mit zwischen die Arme greifenden Zungen 23 die Bremsbandhalterung H.In Fig. 6 the arms 15 are integrally formed on the ring 8 and consist of metal and / or Plastic. You have an inclined position, e.g. a slightly larger cone tip angle defined as the cone apex angle of the truncated cone of the brake band A. The annular thread guide element L can be a sheet metal or plastic part with a thinner one Wall thickness, which is fixed with its outer edge in a groove 21 of the holder 9 is and at the same time serves to secure the ring 8. An inward end 22 of the thread guide element L forms with tongues 23 which reach between the arms Brake band bracket H.

In Fig. 7 ist das Fadenleitelement L bei 24 als zusätzlicher Stützkörper für die Arme, Speichen, Finger oder Federlamellen 15 des Bremsbandträgers T ausgebildet, der mittels des Fadenleitelementes L im Halter 9 festgelegt ist. Ein nach innen vortretender Randbereich 22' umfaßt den Außenrand des Bremsbandes A und bildet die Bremsbandhalterung H, damit das Bremsband A unverlierbar und entnehmbar am Bremsbandträger T angeordnet ist.7, the thread guide element L is at 24 as an additional support body for the arms, Spokes, fingers or spring plates 15 of the brake band carrier T formed the is fixed in the holder 9 by means of the thread guide element L. An internal one Edge region 22 'comprises the outer edge of the brake band A and forms the Brake band holder H, so that the brake band A is captive and removable on Brake band carrier T is arranged.

In Fig. 8 ist ein Blech- oder Kunststoff-Formteil mit einzelnen Armen 15 mittels des den Ring 8 definierenden Fadenleitelementes L in der Halterung 9 festgelegt, z.B. mit einem Sicherungselement 25. Der Bereich 24 des Fadenleitelementes L stützt die Arme 15 im Abstand innerhalb der Halterung 9 zusätzlich ab. Der innere Rand des Fadenleitelementes L bildet die Bremsbandhalterung H für das schwimmend gelagerte Bremsband A.In Fig. 8 is a sheet metal or plastic molded part with individual arms 15 by means of the thread guide element L defining the ring 8 is fixed in the holder 9, e.g. With a securing element 25. The area 24 of the thread guide element L supports the Arms 15 at a distance from the holder 9 in addition. The inner edge of the Thread guide element L forms the brake band holder H for the floating Brake band A.

In den Fig. 9 und 11 ist am Ring 8 ein kegelförmiger Stützkörper 26 des Bremsbandträgers T angeformt, der eigensteif ausgebildet sein kann und in einer Aufnahme 27 eine kreisringförmige Spiralfeder 28 lagert, deren Federwindungen 28a (Fig. 10) einzelne Anlagebereiche 16 definieren, an denen das Bremsband A gelagert ist. Zweckmäßigerweise sind die Federwindungen 28a der Spiralfeder 28 relativ zur Federachse 29 schräggestellt, um eine weichere Federkennung der Anlagebereiche 16 zu erzielen. Der Bremsbandträger T bildet gleichzeitig das Fadenleitelement L und die Bremsbandhalterung H. In Fig. 11 wird auch der Innenrand des Bremsbandes A von dem Stützkörper 26 mit Bewegungsspiel umgriffen. Zur Kraftübertragung dient die kreisförmige Spiralfeder 28. Ein Innenwulst 30 dient als zusätzliche Bremsbandhalterung H. Gegebenenfalls ist der Innenwulst 30 durch Plasmabeschichtung oder auf andere Weise verschleißfest ausgebildet, um bei Kontakt mit dem Faden nicht zu verschleißen. Die Spiralfeder 28 ist durch nicht-dargestellte Halteeinrichtungen in der Aufnahme 27 positioniert.9 and 11 is a conical support body 26 of the brake band carrier on the ring 8 T molded on, which can be intrinsically rigid and in one receptacle 27 supports an annular spiral spring 28, the spring windings 28a (FIG. 10) Define individual contact areas 16 on which the brake band A is mounted. The spring turns 28a of the spiral spring 28 are expediently relative to the spring axis 29 slanted to softer spring detection of the contact areas 16 to achieve. The brake band carrier T simultaneously forms the thread guide element L and the Brake band holder H. In Fig. 11, the inner edge of the brake band A of encompassed the support body 26 with play. The is used for power transmission circular spiral spring 28. An inner bead 30 serves as an additional brake band holder H. Optionally, the inner bead 30 is by plasma coating or on otherwise designed to be wear-resistant so as not to wear out when it comes into contact with the thread. The coil spring 28 is by holding means, not shown, in the Recording 27 positioned.

In Fig. 12 sind die Arme 15 am Ring 8 S-förmig gebogen, um eine größere Federlänge zu erzielen und in den Anlagebereichen 16 mit in etwa senkrecht auf den Abzugsrand 5 gerichteten Kräften zu wirken. Das Fadenleitelement L sowie die Bremsbandhalterung H sind vorgesehen. Zusätzlich ist in Fig. 12 angedeutet, daß das Bremsband A die Anlagebereiche 16 nicht direkt berührt, sondern ein zweckmäßigerweise ebenfalls kegelstumpfförmigen Verschleißelement V zwischengeschaltet ist, das an zumindest einer Seite gleitfreudig ausgebildet oder aus gleitfreudigem und verschleißarmen Material hergestellt ist. Es ist denkbar, das Verschleißelement V mit der Bremsbandhalterung H festzulegen, oder über den Außenrand und/oder den Innenrand des Bremsbandes A greifen zu lassen.In Fig. 12, the arms 15 on the ring 8 are bent in an S-shape by a larger spring length to achieve and in the plant areas 16 with approximately perpendicular to the trigger edge 5 directed forces to act. The thread guide element L and the brake band holder H are provided. In addition, it is indicated in Fig. 12 that the brake band A does not touch the contact areas 16 directly, but rather expediently is also interposed frustoconical wear element V on At least one side designed to be slippery or made of slippery and low-wear Material is made. It is conceivable that the wear element V with the Fix brake band bracket H, or over the outer edge and / or the inner edge the brake band A to grip.

In Fig. 13 ist der Bremsbandträger T der Fadenbremse B ein Kegelstumpfmantel 31 aus einem Material, das dem Kegelstumpfmantel 31 in axialer Richtung erhebliche Steifigkeit verleiht, jedoch in Radialrichtung leicht deformierbar ist. Das Bremsband A ist schwimmend innen im Kegelstumpfmantel 31 gelagert; gegebenenfalls sind einzelne Bremsbandhalterungen H (Nasen, Ohren, oder Lippen) vorgesehen, um die Eindringtiefe des Bremsbandes A in den Kegelstumpfmantel 31 zu begrenzen und/oder sein Herausfallen zu verhindern. Der Kegelstumpfmantel 31 ist am kleindurchmeßrigen Ende mit einem Stützring 32 und über eine Federeinrichtung 33 in axialer Richtung federnd mit einer stationären Abstützung 34 verbunden, die in ihrer Mitte eine Abzugsöse 35 aufweist. Die Federeinrichtung 33 ist zweckmäßigerweise einstellbar, um die axiale Vorspannung des Bremsbandes A am Abzugsrand 5 des Speicherkörpers 4 einstellen zu können. Ein geeignetes Material für den Kegelstumpfmantel 31 wäre mit Kohlenstofffasern verstärktes, dünnes Kunststoffgewebe. In diesem Fall könnte ein eigenständiges Fadenleitelement L (nicht gezeigt) getrennt von der Fadenbremse B am Ausleger 7 des Fadenliefergeräts F (gezeigt in Fig. 13) angeordnet werden.13, the brake band carrier T of the thread brake B is a truncated cone jacket 31 made of a material that the truncated cone shell 31 considerable in the axial direction Stiffness gives, but is easily deformable in the radial direction. The brake band A is floating inside in the truncated cone jacket 31; if necessary, are individual Brake band mounts H (noses, ears, or lips) are provided to increase the depth of penetration to limit the brake band A in the truncated cone jacket 31 and / or to prevent it from falling out. The truncated cone jacket 31 is at the small diameter End with a support ring 32 and via a spring device 33 in the axial direction resiliently connected to a stationary support 34, one in the middle Trigger eye 35 has. The spring device 33 is expediently adjustable, around the axial preload of the brake band A on the trigger edge 5 of the storage body 4 to be able to adjust. A suitable material for the truncated cone jacket 31 would be a thin plastic fabric reinforced with carbon fibers. In this case could be an independent thread guide element L (not shown) separate from the thread brake B arranged on the boom 7 of the yarn delivery device F (shown in Fig. 13) become.

In Fig. 14 besteht der Bremsbandträger T der Fadenbremse B aus einem kegelstumpfförmigen Ringkörper 8, 26, der im Halter 9 abgestützt ist, und aus einem aus weichem Elastomer oder Gummi oder Schaumstoff bestehenden, kegeligen Ring 36, der am Ringkörper 26 festgelegt ist und das schwimmend gelagerte Bremsband A gegen den Abzugsrand 5 drückt. Am Bremsbandträger T kann ferner das Fadenleitelement L mit der Bremsbandhalterung H vorgesehen sein, damit das Bremsband A nicht herausfallen kann.In Fig. 14, the brake band carrier T of the thread brake B consists of a truncated cone Ring body 8, 26, which is supported in the holder 9, and from one soft elastomer or rubber or foam, conical ring 36, which is fixed to the ring body 26 and the floating brake band A presses against the trigger edge 5. The thread guide element can also be on the brake band carrier T. L be provided with the brake band holder H so that the brake band A cannot fall out.

In Fig. 15, die einen Teil der Fadenbremse B von Fig. 14 in einem Schnitt in der Ebene XV-XV zeigt, beaufschlagt der federnde Ring 36 das Bremsband A entweder mit einzelne Anlagebereiche 16 definierenden Erhebungen, zwischen denen Vertiefungen vorgesehen sind, oder mit einem in Umfangsrichtung kontinuierlichen und glatten Anlagebereich 16'.In Fig. 15, the part of the thread brake B of Fig. 14 in a section in the plane XV-XV shows, the resilient ring 36 acts on the brake band A either individual investment areas 16 defining elevations, between which depressions are provided, or with a continuous and smooth in the circumferential direction Investment area 16 '.

Im Betrieb des Fadenliefergeräts, d.h. beim Abziehen und Bremsen des Fadens Y, kann sich das schwimmend gelagerte Bremsband A relativ zum Bremsbandträger T in einer optimalen Position halten, die sich aus dem Kräftegleichwicht zwischen der axialen Andrückung und dem Gegendruck und der Form des Abzugsrandes 5 ergibt. In der Berührungsfläche zwischen dem Bremsbandträger T und dem Bremsband A bzw. an den Anlagebereichen 16, 16' kann sich das Bremsband A gegebenenfalls sowohl in Richtung der Kegelstumpf-Erzeugenden als auch in Umfangsrichtung bewegen. Wird Faden Y abgezogen, wobei der Fadenabzugspunkt um den Abzugsrand 5 rotiert, dann wird das Bremsband A zumindest bei höheren Fadengeschwindigkeiten ggfs. sogar eine Drehbewegung um die Achse X ausführen, wodurch die Anpressung des Bremsbandes an den Abzugsrand in Umfangsrichtung gleichförmig bleibt und eine günstige Verschleißverteilung eintritt. Das sich langsamer als die Fadenumlaufgeschwindigkeit drehende Bremsband trägt dank der Drehung zu einer Minderung des Fadenabzugsspannungsniveaus bei, d.h. zur Begünstigung des Selbstkompensationseffekts, weil die Relativgeschwindigkeit zwischen dem Fadenabzugspunkt und dem Bremsband geringer ist als die Relativgeschwindigkeit zwischen dem Abzugspunkt und dem Bremsbandträger T.In the operation of the thread delivery device, i.e. when pulling and braking the thread Y, can the floating brake band A relative to the brake band carrier T in hold an optimal position, which results from the balance of forces between the axial pressure and the back pressure and the shape of the trigger edge 5 results. In the contact area between the brake band carrier T and the brake band A or at the contact areas 16, 16 ', the brake band A can if necessary move both in the direction of the truncated cone generators and in the circumferential direction. Thread Y is withdrawn, with the thread withdrawal point around the trigger edge 5 rotates, then the brake band A is at least at higher thread speeds if necessary, even perform a rotary movement about the axis X, which causes the pressure of the brake band on the trigger edge remains uniform in the circumferential direction and a favorable distribution of wear occurs. That is slower than the thread speed rotating brake band helps to reduce the rotation the thread take-up tension level at, i.e. to favor the self-compensation effect, because the relative speed between the thread take-off point and the brake band is less than the relative speed between the trigger point and the brake band carrier T.

Der verwendete Bremsbandträger mit Armen kann aus Federstahl, Kunststoff, Zinkdruckguß oder anderem Material bestehen, mit denen sich federnde Arme erzielen lassen. Die Spitzen der Arme sollten sich beim Aufbringen der axialen Anpressung nicht verbiegen, was durch ballige Anlagebereiche oder aufgebrachte Kunstharztropfen erreicht wird. Stahllamellen als die das Bremsband beaufschlagenden Arme sind zweckmäßig und können sich jeweils zur innenliegenden Spitze hin verjüngen, um einen weichen Spitzenbereich zu erzielen. Zweckmäßigerweise wird der Bremsbandträger mittels einer Kardanhalterung in der stationären Abstützung gelagert, damit auch der Bremsbandträger einen Beitrag zur Zentrierung leistet. Es lassen sich mit relativ einfach herstellbaren Kunststoff- oder Stahlausbildungen für den Bremsbandträger Fadenspannungen bis zu 30g problemlos einstellen und einhalten. Der übliche Arbeitsbereich solcher Fadenbremsen umfaßt Spannungswerte zwischen etwa 10 und 15g. In vielen Anwendungsfällen wird es ausreichen, die axiale Vorspannung des Bremsbandes durch die Einstellung des Halters 9 in axialer Richtung vorzunehmen. Es wäre aber denkbar, zusätzlich noch eine Feineinstellung vorzusehen, etwa derart, daß der Ring 8 im Halter 9, z.B. unter Nutzen der Kardanachsen der vorerwähnten Kardanhalterung, in schrägverlaufenden Führungsnuten verdrehbar ist. Ferner könnte es zweckmäßig sein, die geometrischen Relativpositionen zwischen der Bemsbandhaltevorrichtung und den Anlagebereichen so zu wählen, daß das Bremsband vor dem Anpressen an den Abzugsrand 5 gegen die Bremsbandhaltevorrichtung vorgespannt ist und erst unter dem für den Bremsbetrieb benötigten axialen Anpreßdruck an den Abzugsrand von der Bremsbandhalterung freikommt, um das nötige Bewegungspiel zur Selbstzentrierung und zum Schwimmen relativ zum Abzugsrand 5 und relativ zum Bremsbandträger T zu haben. Diese Vorspannung hätte den Vorteil, bei einer Verstellung der Fadenbremse in eine vom Abzugsrand 5 axial abgehobene Position, z.B. zum Einfädeln, eine korrekte Positionierung des Bremsbandes in der Fadenbremse sicherzustellen.The used brake band carrier with arms can be made of spring steel, plastic, die-cast zinc or other material with which resilient arms are achieved to let. The tips of the arms should come off when applying the axial pressure do not bend what is caused by spherical contact areas or applied resin drops is achieved. Steel plates are the arms that act on the brake band expedient and can each taper towards the inner tip to one to achieve soft lace area. The brake band carrier is expediently stored in the stationary support by means of a cardan bracket, so that too the brake band carrier makes a contribution to centering. It can be relative Easy to manufacture plastic or steel designs for the brake band carrier Adjust and adhere to thread tensions up to 30g without any problems. The usual work area such thread brakes include tension values between about 10 and 15g. In many applications, it will suffice to adjust the axial preload of the Brake band by adjusting the holder 9 in the axial direction. However, it would also be conceivable to provide a fine adjustment, such as that the ring 8 in the holder 9, e.g. using the gimbal axes of the aforementioned Cardan bracket, can be rotated in oblique guide grooves. Furthermore, could it may be expedient to determine the geometric relative positions between the brake band holding device and choose the system areas so that the brake band in front biased against the trigger edge 5 against the brake band holding device is and only under the axial contact pressure required for braking operation to the trigger edge of the brake band holder to release the necessary movement for self-centering and swimming relative to the trigger edge 5 and to have relative to the brake band carrier T. This bias would have the advantage of an adjustment of the thread brake in an axially raised from the trigger edge 5 Position, e.g. for threading, correct positioning of the brake band in the Ensure thread brake.

Die Fig. 16 bis 18 verdeutlichen montagefreundliche Bremsbandhalterungen H. In Fig. 16 ist an dem als Kreisringmembrane M aus elastomerem Material bestehenden Bremsbandträger T innerhalb einer gegebenenfalls vorgesehenen Ondulation 10 an der Innenseite eine umlaufende Tasche 38 geformt, die durch eine über den Außenrand des Bremsbandes A greifende, vorzugsweise elastische Lippe 37 begrenzt wird. Anstelle einer umlaufenden Lippe 37 könnten auch einzelne ohrenartige Lippenabschnitte 37' vorgesehen sein, die mehrere über den Umfang verteilte Taschen 38' zum Einschieben des Bremsbandes A definieren.16 to 18 illustrate assembly-friendly brake band holders H. In Fig. 16 is on the existing as an annular membrane M made of elastomeric material Brake band carrier T within an optionally provided undulation 10 the inside is a circumferential pocket 38, which is formed by a over the outer edge of the brake band A engaging, preferably elastic lip 37 is limited. Instead of a circumferential lip 37, individual ear-like lip sections could also be used 37 'can be provided, the plurality of pockets 38' distributed over the circumference Define to insert the brake band A.

In Fig. 17 und 18 sind in die annähernd kegelstumpfförmige Membrane M, die den Bremsbandträger T bildet, mehrere in Umfangsrichtung verteilte, bogenförmige Schlitze 40 eingebracht, deren jeder ein Ohr 39 begrenzt, das über den Außenrand des Bremsbandes greift, sobald dieses montiert ist. Die Lippe 37, bzw. die Abschnitte 37' oder die Ohren 39 der Fig. 16 bis 18 können mit elastischem Andruck auf dem Bremsband A liegen. Die Erstreckung der Lippe 37, 37' bzw. der Ohren 39 ist zweckmäßigerweise so vorbestimmt, daß unter betriebsbedingten Spannungen im Bremsbandträger T bzw. den Arbeitsbewegungen des Bremsbandes A der Außenrand des Bremsbandes A nicht freizukommen vermag. Es reichen drei Abschnitte 37' bzw. Ohren 39 in regelmäßiger Verteilung entlang des Umfanges des Bremsbandes A aus. Zweckmäßigerweise wird aus Sicherheitsgründen aber eine größere Anzahl vorgesehen.17 and 18 are in the approximately frustoconical membrane M, the Brake band carrier T forms a plurality of arcuate slots distributed in the circumferential direction 40 introduced, each of which delimits an ear 39, which over the outer edge of the Brake band engages as soon as it is installed. The lip 37, or the sections 37 ' or the ears 39 of FIGS. 16 to 18 can with elastic pressure on the Brake band A are lying. The extension of the lip 37, 37 'or the ears 39 is expedient so predetermined that under operational stresses in the brake band carrier T or the working movements of the brake band A the outer edge of the Brake band A is unable to release. Three sections 37 'or ears are sufficient 39 in a regular distribution along the circumference of the brake band A. However, a larger number is expediently provided for security reasons.

Claims (22)

  1. Yam feeding device (F) having a storage body (4) being symmetric in relation to its axis (X) and a circumferentially continuous withdrawal rim (5) at said storage body (4), said withdrawal rim (5) forming a yam braking zone (Z) of a yarn brake (B) in co-action with a circumferentially continuous braking band (A) in the shape of a frustocone jacket which is substantially coaxial to axis (X) and is made from material which is elastically deformable substantially perpendicular to the frustocone generatrice, said yam brake (B) having a stationary support (9) for a braking band carrier (T) which presses said braking band (A) substantially axially and resiliently against said withdrawal rim (5), characterised in that said braking band (A) is held floatingly at said braking band carrier (T) in relation to said withdrawal rim (5) and said braking band carrier (T).
  2. Yarn feeding device as in claim 1, characterised in that said braking band (A) is held floatingly in said braking band carrier (T) at least in tangential directions of said withdrawal rim (5).
  3. Yarn feeding device as in claim 1, characterised in that in circumferential direction of said withdrawal rim (5) said braking band carrier (T) is actuating said braking band (A) alternatingly stronger and weaker.
  4. Yarn feeding device as in claim 3, characterised in that said braking band carrier (T) has in its contact region with the braking band (A) a plurality of circumferentially distributed suspension ranges (16) separated by interspaces (18).
  5. Yarn feeding device as in claim 4, characterised in that said suspension ranges (16) are resilient.
  6. Yarn feeding device as in claim 4, characterised in that each suspension range (16) is provided on a preferably resilient arm (15) of said braking band carrier (T), said arm (15) extending inwardly and ending freely.
  7. Yam feeding device as in claim 4, characterised in that the dimensional extension of the braking band (A) in the direction of the frustocone generatrice is larger than the dimensional extension of each suspension range (16) in the same direction, that the dimensional extension of the suspension range in said direction is larger than the width of the braking zone (Z), and that each suspension range (16) exceeds the dimensional extension of said braking zone (Z) substantially symmetrically.
  8. Yarn feeding device as in at least one of claims 1 to 7, characterised in that a braking band holding means (H) is provided which grips outwardly and/or inwardly around at least one of the braking band edges (19, 20), optionally in a positive fashion and with a clearance.
  9. Yam feeding device as in claim 8, characterised in that an outer braking band holding means (H) forms an annular yarn guiding element (L) which is secured with said braking band carrier (T) to said support (9).
  10. Yam feeding device as in claim 1, characterised in that said braking band carrier (T) is formed resiliently at least in axial direction, and that the axial pre-load of the braking band (A) is adjustable by the axial position of said support (9) in relation to said withdrawal rim (5).
  11. Yarn feeding device as in claim 1, characterised in that said braking band carrier (T) within said support (9) or together with said support (9) is substantially axially loaded by a preferably adjustable spring assembly (17, 33).
  12. Yarn feeding device as in claim 1, characterised in that said braking band (A) is inserted into an axially stiff, radially elastically deformable, thin-walled frustocone jacket (31) forming said braking band carrier (T) which is axially longer than the frustocone jacket of the braking band (A).
  13. Yam feeding device as in one of claims 1 to 2, characterised in that a wear take-up element (V) is inserted between said braking band (A) and said braking band carrier (T), said wear take-up element preferably being secured loosely and having the form of a thin-walled, elastically deformable frustocone jacket.
  14. Yarn feeding device as in claim 6, characterised in that said arms (15) of said braking band carrier (T) are inwardly protruding spokes, spring lamellas or pins made from plastic material and/or metal, said arms being provided in essentially radial planes about axis (X) on an annular base body (80).
  15. Yarn feeding device as in claim 6, characterised in that said arms (15) of said braking band carrier (T) are spokes, spring lamellas or pins made from plastic material and/or metal which protrude inwardly from a ring (8), said arms within their extension to said suspension ranges (16) being oriented in a common inclination sense obliquely in relation to radii of axis (X).
  16. Yarn feeding device as in at least one of claims 1 to 5, characterised in that said braking band carrier (T) is a circumferentially continuous ring (26, 8) made from plastic material and/or metal and carries a circular spiral spring (28) the spring windings (28a) of which define said suspension ranges (16).
  17. Yarn feeding device as in claims 16, characterised in that said spring windings (28a) commonly are obliquely slanted in relation to the axis (29) of said spiral spring.
  18. Yam feeding device as in claim 1 or 2, characterised in that said braking band carrier (T) includes either an essentially frustoconical annular membrane (M), preferably having at least one concentric undulation (10), or a deformable ring chamber (11), preferably containing a fluid filling (12), or an intrinsic resilient ring body (36), respectively made from elastic plastic material like rubber or foam material.
  19. Yarn feeding device as in claim 18, characterised in that said braking band carrier (T) is provided either with a circumferentially continuous and even suspension range (16') or with subsequently arranged hills and valleys defining said separated suspension ranges (16).
  20. Yam feeding device as in claims 8 and 18, characterised in that said braking band carrier (T) is equipped with a circumferentially continuous pocket (38) or with several single pockets (38') (T), in which pocket or pockets the outer edge of said braking band (A) is inserted.
  21. Yarn feeding device as in claims 8 and 18, characterised in that several ears (39) defined by slits (40) are provided in said braking band carrier (T), which ears grip inwardly over the outer edge of the braking band (A).
  22. Yam brake (B) for a yarn feeding device (F), particularly according to claim 1, comprising a circumferentially continuous braking band (A) in the form of a frustocone jacket which is elastically deformable substantially perpendicular to the frustocone generatrice and which is held in braking position by a braking bande carrier (T) mounted in a stationary support (9), characterised in that said braking band (A) in its braking position is floatingly held by said braking band carrier (T).
EP98910684A 1997-02-24 1998-02-16 Thread delivery device and thread brake Expired - Lifetime EP0963335B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9700666 1997-02-24
SE9700666A SE9700666D0 (en) 1997-02-24 1997-02-24 Fadenliefer device and fade brake
PCT/EP1998/000880 WO1998038124A1 (en) 1997-02-24 1998-02-16 Thread delivery device and thread brake

Publications (2)

Publication Number Publication Date
EP0963335A1 EP0963335A1 (en) 1999-12-15
EP0963335B1 true EP0963335B1 (en) 2001-10-24

Family

ID=20405924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98910684A Expired - Lifetime EP0963335B1 (en) 1997-02-24 1998-02-16 Thread delivery device and thread brake

Country Status (7)

Country Link
US (1) US6322016B1 (en)
EP (1) EP0963335B1 (en)
KR (1) KR100346365B1 (en)
CN (1) CN1093078C (en)
DE (1) DE59801860D1 (en)
SE (1) SE9700666D0 (en)
WO (1) WO1998038124A1 (en)

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EP3679186B1 (en) * 2017-09-07 2022-01-05 Picanol Thread braking device for a weft feeder device

Also Published As

Publication number Publication date
EP0963335A1 (en) 1999-12-15
KR100346365B1 (en) 2002-07-26
US6322016B1 (en) 2001-11-27
DE59801860D1 (en) 2001-11-29
SE9700666D0 (en) 1997-02-24
CN1093078C (en) 2002-10-23
CN1251078A (en) 2000-04-19
KR20000075662A (en) 2000-12-26
WO1998038124A1 (en) 1998-09-03

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