EP1121318A1 - Yarn tension device and yarn feeding apparatus with a yarn tension device - Google Patents
Yarn tension device and yarn feeding apparatus with a yarn tension deviceInfo
- Publication number
- EP1121318A1 EP1121318A1 EP99950625A EP99950625A EP1121318A1 EP 1121318 A1 EP1121318 A1 EP 1121318A1 EP 99950625 A EP99950625 A EP 99950625A EP 99950625 A EP99950625 A EP 99950625A EP 1121318 A1 EP1121318 A1 EP 1121318A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- braking surface
- brake
- outer ring
- ring
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
- B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
- D03D47/361—Drum-type weft feeding devices
- D03D47/364—Yarn braking means acting on the drum
- D03D47/366—Conical
Definitions
- the invention relates to a thread brake according to the preamble of claim 1 and a thread delivery device according to the preamble of claim 17.
- the brake body is a thin-walled metallic ring band with the shape of a truncated cone jacket, the inside of which forms the braking surface cooperating with the pull-off edge of the storage drum.
- the brake body is supported in the outer edge region of the support structure by means of a generally frustoconical foam ring which is rectangular in cross section, the foam being glued to the rear of the brake body and in the annular support structure.
- the support structure is supported in the stationary support of the thread delivery device via a group of axial coil springs concentric with the central axis of the thread brake.
- the foam forms a first spring device which enables the braking surface to yield locally in the passage area of the thread, but which also has to transmit the axial pretension exerted by the axial coil springs to the braking surface.
- the supporting structure is rigid.
- the first spring device acts essentially on the diameter of the braking surface.
- the required bonds or adhesions are technically complex to manufacture and can be easily removed when the thread brake is in operation.
- the gluing points cause inhomogeneities which cause fluctuations in the thread tension and can also decompose during the orbital movement of the drawn-off thread between the braking surface and the pull-off edge. Correct centering of the brake body on the trigger edge cannot be ensured under all operating conditions.
- the invention has for its object to provide a thread brake of the type mentioned and a thread delivery device with a thread brake, in which the thread brake is easy to manufacture and very reliable, and in which the braking surface can be reliably centered and receives an extraordinarily uniform deformation behavior in the circumferential direction.
- the thread delivery device the thread Denbremse a minimally fluctuating braking effect can be achieved with self-compensation, which means that the tension in the withdrawn thread increases as little as possible with increasing thread speed or increasing thread acceleration, so that the thread tension varies only slightly starting from a sensitively adjustable base tension. Furthermore, a large adjustment range is to be achieved, within which the braking effect can be adjusted very sensitively.
- the thread brake is simple and inexpensive to manufacture, since the brake body with the integral and pre-bent plates, the ring element connecting the outer ends of the plates and the ring-shaped braking surface is a component that can be prefabricated easily and does not adhere to the support structure either for manufacture or for attachment - or glue points are required.
- the plates produce their spring action between the inner and outer ring parts and in the circumferential direction uniformly and with a large effective lever arm, the axial preload in the brake body being introduced by the support structure which can be supported on the stationary support. The result is a long-stroke elastic range with a very uniform deformation behavior of the braking surface in the circumferential direction and a perfect centering of the braking surface on the trigger edge.
- the braking surface automatically compensates for any deviations in the roundness of the trigger edge. Since there are no foam or elastomer materials and no adhesion points, the suspension and braking properties remain constant over a long service life and are not impaired by aging or decomposition. Furthermore, it is ensured that, due to the compensation of deviations from an exact circular shape of the draw-off edge, such deviations have no influence on the thread tension or the uniformity of the braking effect over a full revolution of the thread take-off point.
- a particular advantage of the structure of the brake body is that it has a relatively long axial relative stroke between the braking surface positioned with an orientation defined by the pre-bent plates and the supporting structure results in a relatively constant (flat) spring characteristic, which enables a very sensitive adjustment of the braking effect between very weak and very strong.
- This positive effect results from the fact that, thanks to the pre-bent plates, the variation in braking effect can be distributed over a long adjustment stroke range.
- the support structure is supported on all sides in the universal joint, which ensures reliable centering. This is due to the positive locking of the ring parts of the universal joint, which do not allow uncontrolled relative lateral movements, while the support structure allows an optimal tilting position to compensate for assembly or production-related misalignments between the support and the storage drum of the thread delivery device.
- the brake body is an easily replaceable wearing part.
- the outer ring element is also an integral part of the brake body, which e.g. according to claim 4, is produced from a metal foil blank, for example by etching or laser cutting the spaces between the lamellae, and their subsequent plastic deformation into the curved configuration.
- a long-stroke first spring device is integrated into the brake body, which additionally holds the braking surface in the orientation that ensures optimal working at the trigger edge. The braking surface therefore does not need to be deformed by the axial preload from a radial orientation, which is particularly the case when the braking effect is weak, e.g. for very thin threads, is cheap.
- the outer ends of the plates can be embedded, preferably injected, in a plastic ring, which becomes part of the brake body, so to speak.
- the brake body is positively seated in a version of the support structure.
- the locking ring preferably made of plastic, is actually only required for transport or assembly, and then prevents the brake body from falling out, which remains fixed in the functional position of the thread brake anyway by the axial preload.
- the elongated length of each plate should correspond to a multiple of the width of the braking surface, and the specified dimensions are expedient. Such small spaces also have the advantage that the thread cannot get caught there.
- the disks are almost pre-bent to an approximately radial orientation or even further, whereby they can initially continue the generatrix of the conical braking surface.
- the ring element of the brake body is expediently radial, which simplifies the fastening of the brake body in the support structure. Due to the plastic pre-bending of the plates before the thread brake is installed, the long stroke of the soft, integrated spring device can be predetermined as required.
- a large adjustment stroke with a long effective length of the slats and a soft characteristic can be achieved by multiple pre-bending (serpentine curve) of the slats.
- the slats can be shaped differently from a radial course.
- a transfer that is favorable for the self-centering of the thread brake and a desirable sluggish working behavior of the braking surface principle chosen for the axial preload is a kinematic chain in the transmission of force from the support to the braking surface, in which the force over an axially large-stroke elastic range in the thread brake from relatively far inside first out to the ring element of the brake body and then from the outside again via the plates acts inwards into the braking surface.
- This long force transmission path, which is favorable for the elasticity, is achieved despite the limitation of the installation space given in the radial and axial direction by the structuring of the thread brake.
- the spokes that connect the outer ring to the seat ring of the support structure spiral spring arms that define an additional large-stroke and soft spring device in the thread brake.
- the two spring devices acting in series in the thread brake achieve several advantages, e.g. a particularly large adjustment stroke, good self-centering, optimal compensation of incorrect positions, and extensive decoupling of the braking surface, which behaves very passively or dead during operation, i.e. does not appear undesirably dynamic. The latter is important at high thread speeds.
- the spring hardnesses of the first and second spring devices are expediently approximately similar, so that both spring devices work actively during operation.
- the large-stroke setting range is particularly useful to adjust the braking effect sensitively.
- the supporting structure is nevertheless relatively stiff in the transverse direction and against torsion, and relatively soft only in the axial and tilting directions.
- leaf springs are expediently provided as spokes of the supporting structure 5, e.g. eight flat leaf springs.
- the number of disks in the brake body can be up to 200 or more in order to achieve a high level of homogeneity in the power transmission.
- the seat ring of the supporting structure is a universal joint component that forms a universal joint with a stationary counter-engagement element, in which the thread brake is centered in a form-fitting manner, but has the degree of freedom of all-sided tilting movements, to compensate for any existing manufacturing or assembly tolerances between the stationary support and the storage drum.
- the main components of the thread brake are detachable and releasably connected, prefabricated individual components.
- the thread brake is able to ensure very small fluctuations in the thread tension based on a set base tension of the thread to be drawn, i.e. to provide an effective self-compensation effect according to which high thread speeds or strong thread accelerations do not cause any appreciable increase in thread tension, but an optimal, low-fluctuation thread tension profile can be achieved during operation.
- the range of variation of the braking effect starting from a very weak braking effect, is distributed over a long adjustment stroke.
- the base voltage or the braking effect can be set very sensitively.
- FIG. 1 is a perspective partial view of a thread delivery device with a thread brake
- Fig. 4 is an axial section of the support area of the thread brake in the thread delivery device
- Fig. 5 A; B; C three schematic forms of curvature of the plates of the brake body.
- Fig. 1 is indicated only with its front part yarn delivery device F, for example for supplying a loom with a weft, which has a stationary storage drum T with a storage surface 1, which has, for example, a rounded, in the circumferential direction continuous withdrawal edge 3 with a circular shape is transferred to a front side 2 of the storage drum T.
- a housing-fixed arm 4 extends from the housing (not shown) of the thread delivery device F along the side of the storage drum T to beyond the front side 2.
- the boom 4 carries an arm 5 which is axially adjustable along the boom 4 by means of an adjusting device 6.
- the arm 5 carries coaxially to the storage drum T a take-off eyelet 7 for the thread to be drawn off the weaving machine and forms a stationary support A for a thread brake B, the task of which is to store the threads in adjacent windings on the storage surface 1 and axially overhead through the take-off eyelet 7 to slow down the pull-off edge 3 of the thread drawn off with a braking effect which is as uniform as possible, the braked weft thread rotating around the pull-off edge 3 when being pulled off.
- the thread brake B works with a self-compensation effect, i.e.
- the thread brake has a circumferential continuous, flat and conical braking surface C on a thin-walled braking body D, which is supported in the support A by means of a supporting structure T such that the braking surface C is pressed against the trigger edge 3 with an adjustable axial contact force .
- the braking surface is deformable perpendicular to its surface normal, is tensile in the circumferential direction, and deforms with a rotating shaft in the rotating withdrawal area of the thread.
- the brake body D is, for example, a circular ring made of a metal foil, e.g. Made of a beryllium copper alloy with a small wall thickness (eg 0.1 to 0.8 mm), whereby the annular braking surface C is continued by lamellae L striving outwards to form a closed ring element R, with which the braking body D in an outer edge area or Outer ring 8 of the support structure T is fixed.
- Spokes 9 extend from the outer ring 8 of the support structure to a seat ring 10, which cooperates with a ring element of the support A designed as a counter-engagement element 11 in the manner of a universal or ball joint K, the center of which is positioned approximately in the extension of the storage drum axis.
- the lamellae L are plastically deformed so that they have an arch curvature whose concave curvature side faces the supporting structure T.
- the lamellae L define spiral springs, which overall result in a first spring device S1 in the brake body.
- the spokes 9 are also curved spiral spring arms and form a second spring device S2 within the support structure T.
- the support structure T could only consist of the outer ring 8, which is supported directly in an annular support (not shown) in the boom 4.
- the thread brake B is a structural unit U that can be easily inserted or replaced in the thread delivery device F, for example according to FIG. 1.
- the support A from which an axial pretension is transmitted to the conical, circumferentially continuous braking surface C of the brake body D, takes place on a much smaller diameter d3 than the inside diameter d1 of the braking surface C, and at a considerable axial distance therefrom.
- the power transmission initially takes place from the inside to the outside via the second spring device S2, the spokes 9 expediently having an arc curvature with a concave curvature side 15 facing the braking body D.
- the spokes 9 expediently consist of leaf springs 14, the ends of which are firmly anchored on the seat ring 10 and on the outer ring 8, and which in between follow the appropriately harmonic arc curvature.
- eight spokes 9 are provided.
- the number of spokes can also be larger or smaller.
- the radial spokes 9 are arranged with uniform intermediate distances.
- the thicknesses of the leaf springs 14 can be between 0.1 and 1.0 mm, their width is approximately 3 to 10 mm, preferably approximately 4 to 5 mm. It can be steel (spring steel) leaf springs, or leaf springs made of plastic or composite material. It is conceivable to vary the strength or width of the leaf springs over their length in order to achieve a certain spring behavior.
- the outer ring 8 has a considerably larger diameter d2 than the inner diameter d1 of the braking surface C.
- the diameter d2 can be up to approximately 180% of d1, while the diameter d3 is approximately 40% of d1.
- the outer ring 8 is dimensionally stable. From him, the force is transmitted via the brake body D or its plates L inwards into the braking surface C.
- the length of the spiral spring plates L is a multiple of the width of the tapered braking surface C. In a specific embodiment, more than 200 plates L can be integrally provided in the brake body D, narrow spaces 13 (0.1 to 0.3 mm) being formed between the spiral spring plates. Since the spaces 13 have approximately the same width, the lamellae widen slightly from the braking surface C to the outside.
- the thickness of the brake body which can be formed from a circular, closed metal foil blank, for example from beryllium copper, can be, for example, between 0.1 mm and 0.8 mm.
- the gaps 13 can be formed by etching or laser cutting.
- the curvature of the lamellae L is produced, for example, under the action of pressure and temperature in a mold by plastic deformation, so that a cone angle which is uniform in the circumferential direction is maintained for the braking surface C even without pretensioning the thread brake.
- the lamellae L continuing the braking surface C outwards can initially run in the direction of the generatrix of the conical surface of the braking surface C and only gradually deviate outwards later, so that they have an approximately radial orientation at their ends (almost radial, radial, or even arched or respectively bent several times in a serpentine line, corresponding to FIGS. 5A, 5B, 5C).
- a locking ring 12 is indicated, which is detachable, e.g. snap-fit, is connected to the outer ring 8 and clamps the outer edge region of the brake body D.
- a seat surface 16 can be formed in the seat ring 10, which must cooperate with a counter-engagement element (not shown in FIG. 2) for the possibly desired universal or ball joint function in the support A (FIG. 1).
- Fig. 3 the three components T, D, 12 of the thread brake B are arranged in an exploded view.
- the spokes 9 and the seat ring 10 the radial spokes 9 form the second spring device S2, thanks to which the outer ring 8 is axially and tiltably supported resiliently with respect to the seat ring 10.
- a ring holder 18 for the brake body D, and if necessary also the locking ring 12 may be shaped (indicated by dashed lines) in order to fix or replace the brake body.
- the spring characteristics of the spring devices S1, S2 should be similar to one another or almost the same.
- the radially arranged lamellae L which continue the braking surface C, whose concave curvature side 17 faces the supporting structure T, are integrally connected at their outer ends in a ring element R concentric with the braking surface C.
- This ring element R is fixed by means of the locking ring 12 in the socket 18 of the outer ring 8, wherein the locking ring 12 can be equipped with projections or a circumferential locking flange 19 for engagement.
- the radial width of the locking ring 12 corresponds approximately to the radial width of the ring element R.
- the orientation of the ring element R is selected so that it lies approximately in a radial plane of the brake body D.
- the ring element R could also be conical.
- the brake body D from a metal or plastic film with freely ending plates L and to connect their outer ends to one another by means of a sprayed-on plastic ring (similar to the locking ring 12), this plastic ring then both the ring element R of FIG. 3 as well as the locking ring 12 of FIG. 3, with which the brake body D is attached to the support structure T.
- the brake body D has an outer diameter of approximately 180 mm, while the diameter d1 is approximately 115 mm. This results in a radial width of the blank for the brake body D of approximately 40 mm.
- the seat ring 10 has an inner diameter d3 of approximately 45 mm and is axially spaced from the outer ring 8 by approximately 40 mm. Thanks to the curved curvature of the disks L, the braking surface C is located inside the supporting structure, such that its larger diameter in a side view coincides approximately with the rear contour of the outer ring 8 when the thread brake B is not installed.
- the spring hardness of the first spring device S1 formed in the slats is approximately equal to the spring hardness of the second spring device S2.
- the universal or ball joint K can be seen in the area of the support A, in which the thread brake B is able to perform tilting movements about the central axis of the storage drum T or the thread brake B in order to center properly on the trigger edge 3.
- the seat ring 10 of the support structure T sits with its bearing surface i ⁇ ; on a spherical bearing surface 20 of the counter-engagement element 11, for example, which is attached to the arm 5 and surrounds the trigger eyelet 7 approximately concentrically.
- the bearing surface 20 is delimited on the inside by an annular flange 19, which also causes a pivoting or tilting limitation for the supporting structure T.
- the ball joint K can be expedient in order to improve the centering of the thread brake on the trigger edge 3 of the storage drum T. Due to the flexibility or softness that results in the thread brake thanks to the series-connected first and second spring devices S1 and S2, the seat ring 10 could alternatively also be firmly supported on the arm 8, i.e. without universal joint function.
- the locking ring 12 as the third component of the thread brake B could be omitted if the brake body D is integrated directly into the support structure, e.g. by injection molding the outer ring 8 around the ring element R or over the free ends of the spiral spring plates L. Then the support structure T would also have to be exchanged when replacing a worn brake surface C or to replace the brake body.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Braking Arrangements (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
- Springs (AREA)
- Knitting Machines (AREA)
- Looms (AREA)
- Transmission Devices (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19846221 | 1998-10-07 | ||
DE19846221A DE19846221A1 (en) | 1998-10-07 | 1998-10-07 | Thread brake and thread delivery device with a thread brake |
PCT/EP1999/007409 WO2000020316A1 (en) | 1998-10-07 | 1999-10-05 | Yarn tension device and yarn feeding apparatus with a yarn tension device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1121318A1 true EP1121318A1 (en) | 2001-08-08 |
EP1121318B1 EP1121318B1 (en) | 2003-03-26 |
Family
ID=7883717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99950625A Expired - Lifetime EP1121318B1 (en) | 1998-10-07 | 1999-10-05 | Yarn tension device and yarn feeding apparatus with a yarn tension device |
Country Status (8)
Country | Link |
---|---|
US (1) | US6572047B1 (en) |
EP (1) | EP1121318B1 (en) |
KR (1) | KR100436751B1 (en) |
CN (1) | CN1210198C (en) |
AT (1) | ATE235417T1 (en) |
AU (1) | AU6333999A (en) |
DE (2) | DE19846221A1 (en) |
WO (1) | WO2000020316A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10056485B4 (en) * | 2000-11-15 | 2013-11-28 | Iropa Ag | Yarn braking ring |
ITTO20040105U1 (en) * | 2004-08-05 | 2004-11-05 | Lgl Electronics Spa | WEFT FEEDER FOR WEAVING FRAMES EQUIPPED WITH SELF-REGULATING BRAKING DEVICE |
DE102004045725A1 (en) * | 2004-09-21 | 2006-03-23 | Aktiebolaget Iro | Yarn braking body |
DE202004021773U1 (en) * | 2004-10-27 | 2010-11-25 | Diedrichs, Helmut W. | Filament composite of metal and shaped body of metal |
ITTO20050028U1 (en) * | 2005-02-25 | 2006-08-26 | Lgl Electronics Spa | WEFT FEEDER FOR TEXTILE MACHINES WITH YARN BRAKING DEVICE |
DE102006001125A1 (en) * | 2006-01-09 | 2007-07-12 | Iro Ab | Yarn feeding device and brake body |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1133900B (en) * | 1980-10-15 | 1986-07-24 | Roy Electrotex Spa | MEANS FOR BRAKING THE OUTPUT YARN IN CONSTANT AND ADJUSTABLE TENSION FEED DEVICES, PARTICULARLY FOR TEXTILE MACHINES |
EP0330951B1 (en) * | 1988-03-02 | 1992-01-29 | L.G.L. ELECTRONICS S.p.A. | Weft feeding device, particularly for looms |
EP0855358B1 (en) * | 1990-03-12 | 2001-10-17 | Iro Ab | Yarn feeder |
IT1258241B (en) * | 1992-11-05 | 1996-02-22 | WEFT FEEDER | |
IT1256329B (en) * | 1992-11-23 | 1995-11-30 | WIRE FEEDING DEVICE | |
IT1263623B (en) * | 1993-02-23 | 1996-08-27 | Roj Electrotex Nuova Srl | WIRE FEEDER |
IT1264844B1 (en) * | 1993-06-17 | 1996-10-17 | Roj Electrotex Nuova Srl | WIRE FEEDER |
DE4407958A1 (en) | 1994-03-09 | 1995-09-14 | Iro Ab | Thread brake device |
DE9406102U1 (en) * | 1994-04-13 | 1995-08-10 | Sobrevin Société de brevets industriels-Etablissement, Vaduz | Thread store with thread take-off brake |
US5546994A (en) * | 1994-10-14 | 1996-08-20 | Sobrevin Societe De Brevets Industriels-Etablissement | Thread storage drum with frustoconical brake strip |
DE19634972A1 (en) * | 1996-08-29 | 1998-03-05 | Iro Ab | Device for braking a thread and thread delivery device |
DE19649220A1 (en) * | 1996-11-27 | 1998-05-28 | Iro Ab | Thread delivery device with a thread brake |
SE9700666D0 (en) * | 1997-02-24 | 1997-02-24 | Iro Ab | Fadenliefer device and fade brake |
IT1295624B1 (en) * | 1997-10-15 | 1999-05-24 | Roj Electrotex Nuova Srl | BRAKING DEVICE FOR YARN IN WEFT FEEDERS AND BRAKING ELEMENT FOR SAID DEVICE |
ITMI981313A1 (en) * | 1998-06-10 | 1999-12-10 | Roj Electrotex Nuova Srl | BRAKE FOR YARNS ESPECIALLY FOR WEFT FEEDERS |
-
1998
- 1998-10-07 DE DE19846221A patent/DE19846221A1/en not_active Withdrawn
-
1999
- 1999-10-05 CN CNB998118699A patent/CN1210198C/en not_active Expired - Fee Related
- 1999-10-05 KR KR10-2001-7004424A patent/KR100436751B1/en not_active IP Right Cessation
- 1999-10-05 US US09/806,788 patent/US6572047B1/en not_active Expired - Fee Related
- 1999-10-05 WO PCT/EP1999/007409 patent/WO2000020316A1/en active IP Right Grant
- 1999-10-05 DE DE59904775T patent/DE59904775D1/en not_active Expired - Fee Related
- 1999-10-05 AT AT99950625T patent/ATE235417T1/en not_active IP Right Cessation
- 1999-10-05 AU AU63339/99A patent/AU6333999A/en not_active Abandoned
- 1999-10-05 EP EP99950625A patent/EP1121318B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0020316A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6572047B1 (en) | 2003-06-03 |
ATE235417T1 (en) | 2003-04-15 |
AU6333999A (en) | 2000-04-26 |
WO2000020316A1 (en) | 2000-04-13 |
KR20010080044A (en) | 2001-08-22 |
CN1322182A (en) | 2001-11-14 |
DE19846221A1 (en) | 2000-04-13 |
DE59904775D1 (en) | 2003-04-30 |
KR100436751B1 (en) | 2004-06-22 |
CN1210198C (en) | 2005-07-13 |
EP1121318B1 (en) | 2003-03-26 |
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