EP0927139B1 - Fadenbremse - Google Patents
Fadenbremse Download PDFInfo
- Publication number
- EP0927139B1 EP0927139B1 EP97909298A EP97909298A EP0927139B1 EP 0927139 B1 EP0927139 B1 EP 0927139B1 EP 97909298 A EP97909298 A EP 97909298A EP 97909298 A EP97909298 A EP 97909298A EP 0927139 B1 EP0927139 B1 EP 0927139B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- storage drum
- yarn
- thread
- tensioning device
- 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
Links
Images
Classifications
-
- 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
Definitions
- the invention relates to a thread brake in the preamble of claim 1 specified type.
- these thread brakes show a self-compensation effect, i.e. that the tension in the drawn weft with speed changes not as you would expect and from the usual practice Thread brakes known, extremely varied, but at low speed relatively high, but only a relatively moderate value at high speed Has.
- the favorable narrow bandwidth of the voltage variation is the main advantage such thread brakes, since a perfect weft thread control with reduced Thread breakage rate is reached.
- the brake band is made of thin Metal sheet on the inside of a truncated cone-shaped carrier made of carbon fiber composite material arranged.
- the carrier is covered by a membrane or a spring device in the axial direction against the front end of the storage drum and keeps the brake band in contact with the one on the storage drum concentrically shaped, rounded braking surface.
- the cone apex angle of the generators the contact surface of the brake band is approximately 120 °.
- the brake band with a frustoconical shape Shape in a foam ring held in the large-diameter End of a rigid frustoconical hollow body is held.
- To the Hollow body attacks a spring device that the axial preload for the Brake band generated.
- the braking surface of the storage drum is conical, so that there is a flat and conical braking zone.
- the brake band is tensile but locally deformable. It is flat Brake zone below the brake belt comprising the storage drum.
- the design-fixed brake element is made of metal with disc or funnel shape and under axial spring force against the radial braking surface at the front end of the storage drum.
- the Brake element is, among other things, axially movable and is supported by the Pointer movement between the braking surface and the braking element rotating while moving the pulled thread as a whole without significant deformation.
- the invention has for its object a thread brake for one with widely varying Thread speed of a loom and a weft to create with a response that with a significant reduction in Thread speed a precisely predeterminable, relatively high basic tension is kept in the thread.
- the thread brake should be preferred for rapier weaving machines be suitable, especially in the handover phase from the grabber the slave gripper a precisely predeterminable, relatively high basic voltage in the Thread is needed to make cooperation between the weft and the Bringer and the taker gripper to support from the weft.
- the ring with the radial orientation with respect to the storage drum axis is completely decoupled from the mass of the trigger eye and executes its work cycle in the braking zone without external influences, the axial Preload against the braking surface is transmitted in such a way that the local deformability of the ring in the passage area of the circumferential weft thread remains. Thanks to the radial orientation of the ring, it does not require any measures for centering in relation to the braking surface, i.e. the center of the braking zone is in all operating conditions determined by the center of the braking surface.
- a thread delivery device for knitting machines is known from DE-C 4 336 994, that with a rotary driven storage drum and a front assigned to it, counter brake disc driven at the speed of the storage drum Made of thin, flexible material known that the knitting thread against the Front surface of the storage drum is stuck.
- the storage drum runs continuously with only slight changes in speed, so that the knitting thread withdrawal point almost standing still in the room or slowly in or against the direction of rotation emigrated.
- the trigger eye is structurally connected to the counter brake disc.
- This Thread delivery device with the integrated thread brake is only intended for knitting machines and can be used for modern mechanical, unprotected weaving machines such as Do not use rapier looms or projectile looms.
- the rotating one The counter brake disc is attached to the trigger eyelet that is firmly bonded to it centered relative to the storage drum.
- the trigger eye forms a relatively large, auxiliary mass connected to the counter brake disc, its own movements affects the response of the counter brake disc in their work cycle.
- the braking zone is theoretically flat, so that the braking power is performed with a specifically lower load. This can be for sensitive thread material be cheaper. in practice, however, in spite of those interacting in the braking zone Surfaces (braking surface and contact surface of the ring) nevertheless only an approximately linear braking zone is created.
- the weft occurs early after the first 90 ° deflection the braking zone. Due to the relatively large diameter of the braking zone, the specific speed of rotation of the thread in the braking zone even at high thread speed low, which can be advantageous for some applications.
- the rotational speed of the thread in the braking zone with a relatively small diameter high; however, responsiveness is influencing Reduced inertial forces of the ring, especially if according to claim 6 the outside diameter of the ring is as small as possible.
- the material can be copper or steel or can be particularly durable and wear-resistant metal alloys are used. Plastic with more wear resistant Surface and high fatigue strength can also be used.
- the ring can be produced inexpensively, since it is cut from flat material is malleable. Because the extremely precise centering of the braking zone in terms of the storage drum axis is determined exclusively by the braking surface, are the Outside or inside contours of the ring are only of secondary importance, i.e. it is not necessarily an exact circular ring shape, but the outer and / or The inner circumference of the ring can be polygonal.
- a largely homogeneous spring body made of elastic Material used to transmit the axial pressing force of the ring.
- This spring body is inexpensive to manufacture and affects local deformability the ring in the passage area of the weft through the braking zone hardly.
- the entire axial preload is divided into an infinite number, so to speak smaller axial force components, so that despite a relatively high total axial preload the thread in the passage area only the relatively low resistance to deformation of the ring and only a few of the small axial force components of the total preload has to overcome.
- This forms the continuous weft a crescent-shaped gap between the contact surface of the ring and the braking surface, that runs with the weft like a wave and possibly jointly responsible for it is that in the dynamic phase at high thread speed level or at strong acceleration of the contribution of the thread brake to the take-off tension unexpectedly remains low, i.e. that the thread brake then becomes due to the acceleration or high speed anyway higher tension in the drawn thread contributes as little as possible, while at low speed or when the weft thread is at a standstill, the contribution of the thread brake to the then anyway small Thread tension is higher. At most, this results in the advantage of a relative high basic tension at low thread speed or at standstill and one relatively narrow bandwidth of the thread tension change between low thread speed and maximum thread speed or at maximum Deceleration or acceleration.
- the ring is connected to the spring body for simplified assembly, e.g. bonded.
- a point-by-point bonding or one continuous bonding in question comes only a point-by-point bonding or one continuous bonding in question.
- Alternatively, according to claim 10 are a plurality of coil springs in the circumferential direction distributed or provided one or more concentric large coil springs.
- a simple embodiment in terms of assembly and production technology is the starting point 12 out.
- the cap is used to hold the ring and the trigger eye, whereby Inertia forces and axial force components from the thread deflection be reliably kept away from the ring.
- the axial preload can be adjusted by adjusting the cap change the bracket of the delivery device.
- the cap can be stably supported with its retaining flange.
- the basic static tension of the weft thread is a precisely controlled pointer movement the weft thread around the trigger is important.
- the uncontrollable weft thread entering the braking zone Direction changes and self-motions would run on affect the trigger voltage.
- a balloon limiter and / or thread brake ring provided, which expediently from the Cap is worn and forces the thread into the precisely controlled pointer movement, with which it revolves in the braking zone.
- the balloon limiter or the thread brake ring could also be provided separately from the cap upstream of the braking zone his.
- the cap directly forms the balloon limiter with its edge region for perfect thread control.
- a weft feeder F for a mechanical defenseless weaving machine has in a housing 1 having a boom 2 by means of a drive, not shown, to drive the thread winding member 3, whose axis of rotation with the axis X of a storage drum T which is stationary during operation flees.
- the storage drum T has, for example, a drum body 4 with a to the axis X rotationally symmetrical outer peripheral surface.
- the storage drum T has on its front, over which the weft Y overhead and then axially withdrawn from the loom, one concentric to the X axis Braking surface 5, namely in the embodiment shown in Fig. 1 convex rounded braking surface 5a.
- the braking surface 5, 5a is arranged and trained that it is on a smaller diameter than the maximum outer diameter the storage drum T, and that it from a radial plane to the axis X is tangible over the full extent of the storage drum T.
- an indentation 6 closes inwards in the front of the storage drum T at.
- the front of the storage drum T is a thread brake integrated in the delivery device F. B assigned.
- the thread brake B has a braking element E in the form of a radially to the axis X oriented ring 7 made of a thin flexible but tensile and wear-resistant material, whose outer diameter in the shown Embodiment is larger than the maximum outer diameter of the storage drum, and whose inside diameter is slightly smaller than the diameter of the braking surface 5, 5a.
- the ring 7 consists for example of thin sheet metal or thin Plastic and has a bearing surface 20, the generatrix related to the X axis is a straight line lying radially to the axis X.
- the ring 7 is with the contact surface 20 applied under axial prestress to the braking surface 5, 5a, so that a at least theoretically circular braking zone between the ring 7 and the Braking surface 5, 5a is formed, the shape and centering on the X axis exclusively depends on the design of the braking surface 5, 5a.
- the ring 7 has expediently constant wall thickness, e.g.
- a spring body 8 which at the embodiment shown from a plurality of circumferentially distributed coil springs 9 exists, which, advantageously elastic spring supports 10 - or alternatively via a single, common to all coil springs 9, too spring support ring preferably made of elastic material (as 9 'in Fig. 2) with approximately the same inside or outside diameter as the brake ring 7 - the Apply back side 21 of the brake ring 7.
- a take-off eyelet 11 is provided coaxially with the axis X, the inlet mouth of which is shown in FIG. 1 lies slightly to the right of the radial plane tangent to the braking surface 5, 5a.
- the inlet mouth of the trigger eyelet 11 could also be compared to the position shown be shifted further to the right, but also further to the left, but not to the left further than into the radial plane tangent to the braking surface 5, 5a.
- the ring 7 is expediently, via the spring supports - alternatively via the above common spring support ring - connected to the spring body 8.
- the spring body 8 and the trigger eyelet 11 are in one on the front of the storage drum T fitted cap 12, in such a way that the ring 7 structurally of the trigger eye 11 is separated.
- the cap 12 has an outer holding flange 13 equipped, which is contained in a holder 14 of the delivery device F.
- the bracket 14 can be adjusted axially in the direction of a double arrow 15 to the axial bias to change the ring against the braking surface 5, 5a. It is expedient the bracket 14 is supported in the boom 2 of the housing 1.
- Thread control element 25 can be arranged, e.g. a so-called bristle ring or a balloon breaker ring.
- the bristle ring does the job of the last of the turns 16 entering the braking zone between the ring 7 and the braking surface 5, 5a Prevent thread from ballooning and / or in a pointer movement to force the center of the draw-off eye 11, i.e. to control the weft Y so that it runs approximately radially into the braking zone and thereby with essentially radial alignment revolves in the circumferential direction.
- the cap 12 or an equivalent holding part also be supported on a stationary holder separate from the delivery device F. Furthermore, it is conceivable to support the trigger eyelet 11 separately from the spring body 8, so that with axial adjustments of the cap 12, the trigger eyelet 11 its preselected position not changed.
- the braking surface 5 is radial to a considerably smaller diameter shifted inwards than in Fig. 1.
- the braking surface 5 is a flat circular ring surface 5b with radial alignment to the axis X, on which the also radially aligned Ring 7 is applied flat with the axial preload of the spring body 8.
- the Storage drum T has a conveniently convexly rounded trigger edge 17 near the front, from which a transition 18 to the braking surface 5, 5b extends. Instead of a transition 18 leading the thread with contact, it could also a stepped or hollowed transition 24 may be provided.
- the spring body 8 is in the embodiment of Fig.
- the spring body 8 is like that Trigger eyelet 11 held by the cap 12, which is axially adjustable in the boom 2 is.
- the edge region of the cap 12 is a ball breaker 26 shown and arranged closer to the outer periphery of the storage drum T.
- a thread control element in the form of a brake ring e.g. of a bristle ring 25 as in the embodiment according to FIG. 1, whose Function and role become more important the smaller the diameter of the braking surface in relation to the maximum storage drum diameter is where the braking element is E works.
- Fig. 3 illustrates a further embodiment in which the braking element E defining ring 7 is connected with its rear side to a spring body 8, which consists of elastic material such as rubber, plastic or foam and as a type of double spiral spring with an internal cavity can be formed.
- a spring body 8 which consists of elastic material such as rubber, plastic or foam and as a type of double spiral spring with an internal cavity can be formed.
- Fig. 4 illustrates in a plan view how the drawn weft Y in the Braking zone between the ring 7 and the braking surface 5, 5a, 5b is pulled and rotates in the direction of arrow 23 with the aforementioned pointer movement.
- the weft Y the contact surface 20 of the ring 7 in an approximately crescent-shaped gap area from the braking surface 5a, 5b, 5 pushes away and thereby the spring body 8, here a spring body elastic, largely homogeneous material 9 'deformed.
- This local deformation of the ring 7 runs in a wave-like manner with the weft Y.
- the braking effect for the weft is reduced,
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Description
- Fig. 1
- einen zum Teil schematischen Längsschnitt eines Schußfadenliefergeräts für eine Webmaschine mit einer ersten Ausführungsform einer Fadenbremse,
- Fig. 2
- einen schematischen Längsschnitt einer anderen Ausführungsform,
- Fig. 3
- einen Teilschnitt einer weiteren Ausführungsform, und
- Fig. 4
- eine Draufsicht zur Verdeutlichung der Bremsfunktion in der Fadenbremse.
Claims (16)
- Fadenbremse in einem Schußfaden-Liefergerät (F) für eine mechanische, schützenlose Webmaschine, insbesondere eine Greiferwebmaschine, mit einer an einer stationären Speichertrommel (T) des Liefergeräts (F) frontseitig konzentrisch angeordneten Bremsfläche (5, 5a, 5b), mit einer vor dem Frontende der Speichertrommel (T) koaxial angeordneten Abzugsöse (11), und mit einem nicht drehbar gehalterten Bremselement (E) aus zug- und verschleißfestem, dünnwandigem und lokal verformbarem Material, das mit einer in Umfangsrichtung kontinuierlichen Auflagefläche (20) axial und federnd gegen die Bremsfläche angedrückt ist und mit dieser eine zur Speichertrommelachse (X) konzentrische Bremszone definiert für den beim Abzug mit einer Zeigerbewegung um die Abzugsöse (11) rotierenden Schußfaden, dadurch gekennzeichnet, daß die Bremsfläche (5, 5a, 5b) die frontseitige Begrenzung der Speichertrommel (T) bildet, daß das Bremselement (E) ein ebener und zur Speichertrommelachse (X) radialstehender Ring (7) ist, der an seiner der Auflagefläche (20) abgewandten Seite (21) federnd derart beaufschlagt ist, daß trotz der Federbeaufschlagung seine lokale Verformbarkeit im Durchgangsbereich des Schußfadens (Y) durch die Bremszone erhalten bleibt, und daß die Abzugsöse (11) vom Ring (7) getrennt und mit ihrer Einlaufmündung in Abzugsrichtung des Schußfadens axial hinter oder höchstens in der Radialebene der Bremsfläche (5, 5a, 5b) angeordnet ist.
- Fadenbremse nach Anspruch 1, dadurch gekennzeichnet, daß die Bremsfläche (5, 5a) konvex gerundet ist.
- Fadenbremse nach Anspruch 1, dadurch gekennzeichnet, daß die Bremsfläche (5b) eine zur Speichertrommelachse (X) radiale Kreisringfläche ist.
- Fadenbremse nach wenigstens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Außendurchmesser des Ringes (7) größer ist als der maximale Speichertrommeldurchmesser.
- Fadenbremse nach wenigstens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Bremsfläche (5, 5a) auf einem gegenüber dem maximalen Speichertrommeldurchmesser erheblich kleineren Durchmesser angeordnet ist.
- Fadenbremse nach Anspruch 5, dadurch gekennzeichnet, daß der Außendurchmesser des Rings (7) kleiner ist als der maximale Speichertrommeldurchmesser.
- Fadenbremse nach wenigstens einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Ring (7) aus dünnem und flexiblem Metallblech oder Kunststoff besteht und eine gleichbleibende Stärke besitzt, vorzugsweise deutlich weniger als 1,0mm.
- Fadenbremse nach wenigstens einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Ring (7) mittels zumindest eines aus im wesentlichen homogenem elastischem Material wie Gummi, Kunststoff oder Schaumstoff bestehenden, ringförmigen Federkörpers (9', 10) beaufschlagt ist.
- Fadenbremse nach Anspruch 8, dadurch gekennzeichnet, daß der Ring (7) mit dem Federkörper (9', 10) verbunden ist, z.B. verklebt ist.
- Fadenbremse nach wenigstens einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Ring (7) durch einen Federkörper (8) aus einer Schraubenfeder oder aus mehreren in Umfangsrichtung regelmäßig verteilten Schraubenfedern (9) beaufschlagt ist.
- Fadenbremse nach Anspruch 10, dadurch gekennzeichnet, daß zwischen dem Ring (7) und der bzw. den Schraubenfedern (9) wenigstens ein vorzugsweise elastisches Auflagerteil (10) vorgesehen ist.
- Fadenbremse nach wenigstens einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß eine das Frontende der Speichertrommel (T) im Abstand übergreifende Kappe (12) vorgesehen ist, die in der Mitte die Abzugsöse (11) und außerhalb der Abzugsöse (11) den Federkörper (9, 9', 8) trägt.
- Fadenbremse nach Anspruch 12, dadurch gekennzeichnet, daß die Kappe (12) relativ zur Frontseite der Speichertrommel (T) axial verstellbar in einer Halterung (14) des Liefergeräts (F) festgelegt ist.
- Fadenbremse nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Kappe (12) einen außenseitigen Halteflansch (13) besitzt.
- Fadenbremse nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Kappe (12) in ihrem über die Frontseite der Speichertrommel (T) greifenden Randbereich innenseitig eine Aufnahme für einen ringförmigen Ballonbegrenzer und/oder Fadenbremsring (25) aufweist.
- Fadenbremse nach wenigstens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Kappe (12) mit ihrem über die Frontseite der Speichertrommel (T) greifenden Randbereich als Ballonbegrenzer (26) ausgebildet ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19638618A DE19638618A1 (de) | 1996-09-20 | 1996-09-20 | Fadenbremse |
DE19638618 | 1996-09-20 | ||
PCT/EP1997/005158 WO1998012135A1 (de) | 1996-09-20 | 1997-09-19 | Fadenbremse |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0927139A1 EP0927139A1 (de) | 1999-07-07 |
EP0927139B1 true EP0927139B1 (de) | 2002-02-20 |
Family
ID=7806365
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97909298A Expired - Lifetime EP0927139B1 (de) | 1996-09-20 | 1997-09-19 | Fadenbremse |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0927139B1 (de) |
DE (2) | DE19638618A1 (de) |
WO (1) | WO1998012135A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1292765B1 (it) * | 1997-06-11 | 1999-02-11 | Lgl Electronics Spa | Perfezionamento ai dispositivi di frenatura modulata autoregolata del filato per apparecchi alimentatori di trama a macchine tessili |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1049362B (it) * | 1975-03-10 | 1981-01-20 | Vella Spa R | Dispositivo alimentatore di filato a tensione costante regolabile particolarmente per l uso nelle macchine tessili e per maglieria |
RU2091521C1 (ru) * | 1990-03-12 | 1997-09-27 | Иро Аб | Устройство торможения нити на выходной стороне средства подачи нити |
US5316051A (en) * | 1991-09-20 | 1994-05-31 | L.G.L. Electronics S.P.A. | Self-adjusting thread braking device for weft feeder units |
IT1263623B (it) * | 1993-02-23 | 1996-08-27 | Roj Electrotex Nuova Srl | Alimentatore di filo |
DE4336994C1 (de) * | 1993-10-29 | 1995-03-30 | Heinrich Fabschitz | Fadenliefervorrichtung mit stufenlos einstellbarer Fadenabzugspannung |
DE9406102U1 (de) * | 1994-04-13 | 1995-08-10 | Sobrevin Société de brevets industriels-Etablissement, Vaduz | Fadenspeicher mit Fadenabzugsbremse |
DE19542045A1 (de) * | 1995-11-10 | 1997-05-15 | Iro Ab | Fadenliefergerät |
-
1996
- 1996-09-20 DE DE19638618A patent/DE19638618A1/de not_active Withdrawn
-
1997
- 1997-09-19 DE DE59706446T patent/DE59706446D1/de not_active Expired - Fee Related
- 1997-09-19 EP EP97909298A patent/EP0927139B1/de not_active Expired - Lifetime
- 1997-09-19 WO PCT/EP1997/005158 patent/WO1998012135A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
WO1998012135A1 (de) | 1998-03-26 |
DE59706446D1 (de) | 2002-03-28 |
DE19638618A1 (de) | 1998-03-26 |
EP0927139A1 (de) | 1999-07-07 |
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