EP0280025B1 - Yarn-tensioning device - Google Patents

Yarn-tensioning device Download PDF

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Publication number
EP0280025B1
EP0280025B1 EP88100603A EP88100603A EP0280025B1 EP 0280025 B1 EP0280025 B1 EP 0280025B1 EP 88100603 A EP88100603 A EP 88100603A EP 88100603 A EP88100603 A EP 88100603A EP 0280025 B1 EP0280025 B1 EP 0280025B1
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EP
European Patent Office
Prior art keywords
roller
yarn
thread
carrier
braking surface
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
EP88100603A
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German (de)
French (fr)
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EP0280025A2 (en
EP0280025A3 (en
Inventor
Karl Heinz Küsters
Hans Theihsen
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Hacoba Textilmaschinen GmbH and Co KG
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Hacoba Textilmaschinen GmbH and Co KG
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Publication date
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Publication of EP0280025A2 publication Critical patent/EP0280025A2/en
Publication of EP0280025A3 publication Critical patent/EP0280025A3/en
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Publication of EP0280025B1 publication Critical patent/EP0280025B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/16—Braked elements rotated by material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a thread braking device, with two rollers rotatably supported by parallel roller axes, one of which is hollow as a thread roller and is at least partially encircled by a thread on its outer circumference, and of which the other has a coating of elastic material as a pressure roller and thus rests with an adjustable contact pressure on a circumference of a braking surface rigidly connected to the thread roller and rolls on it when the thread is pulled off.
  • Such a thread braking device is known from US-A-2 686 018, wherein the pot-like thread roller has on its outer circumference a V-shaped annular groove for partial wrapping by a thread and at the level of this annular groove has a brake flange projecting parallel to the roller axis, the inner surface of which Forms braking surface on which the pressure roller lying between this inner surface of the brake flange and the roller axis rolls.
  • the pressure roller can only have a small outer diameter compared to the braking surface of the thread roller, so that it must rotate much faster than the thread roller. As a result, their elastic covering wears out quite quickly.
  • the known thread braking device is therefore not suitable for high thread running speeds.
  • a thread braking device in which two brake discs of the same outside diameter roll on each other and are braked by flexing elastic material.
  • a brake disc carries a thread-wound disc with a larger diameter in order to make the braking effect adjustable within further limits.
  • the diameter of the disc placed on a brake disc can, however, not be much larger than the brake disc itself for constructional reasons, and the wear resistance of the elastic coating of this known thread brake device is only influenced to an insignificant extent.
  • a device for keeping the wire tension constant in winding machines with high speeds in which the wire is pulled between two felt pads of a felt pre-brake and runs into a clamping groove between two steel disks forming a wire roller, from which the wire is pulled leaves.
  • the wire roller is mounted outside of a housing on an axis which has a braking surface inside the housing, on which a pressure roller with a coating of elastic material runs, the contact pressure of which is adjustable. It can be reduced or completely canceled by a swivel lever which is acted upon by the running wire on the outlet side of the device.
  • This brake device intended for wire is not suitable for thread braking and, in particular in conjunction with creel gates, cannot be used economically because of the considerable structural effort with the pre-brake and brake relief.
  • a thread brake which consists essentially of a single thread roller wound around the thread, which is hollow like a pot and is located above an electromagnetic brake which acts on the axis of rotation of the thread roller to brake. Mechanical wear of the mechanical parts involved in the braking process naturally does not occur due to the electromagnetic effect of the braking device.
  • the invention has for its object to improve a thread brake device of the type mentioned so that it is much more wear resistant at the required high thread speeds, without the need for a significant structural effort for its construction.
  • the two rollers are arranged upright above a carrier of a creel with vertical axes, that the braking surface of the pressure roller is arranged on the roller axis of the pot-like thread roller between the latter and the carrier, that the thread roller sits higher above the carrier, than the pressure roller pressed beneath it against the braking surface, the roller axis centers being approximately equal to the radius of the thread roller, the pressure roller and a section of the roller axis having the braking surface are encapsulated in a housing which is fastened to the carrier such that the with its thread wrapping surface arranged above the housing thread roller closes its passage opening in the housing with a radial ring collar arranged in the plane of a housing outer wall except for a gap and that the roller axes diameter of the pot-like thread roller in the B the braking surface is smaller than the diameter of the pressure roller.
  • the braking surface of the thread roller can have a very small diameter in that the roller axis of the pot-like thread roller itself forms the braking surface, so that a lower limit for the diameter of the braking surface is practically given only by the thickness of the roller axis required for mechanical reasons.
  • the wear of the elastic coating of the pressure roller is comparatively low, especially since the diameter in the area of the braking surface can be smaller than the diameter of the pressure roller.
  • the latter means a reduction in the sense that the pressure roller can rotate much more slowly compared to the thread roller due to its larger diameter. For example, the pinch roller rotates only half as fast as the thread roller, so that a considerable reduction in wear on the pinch roller is also achieved for this reason.
  • the arranged on the roller axis of the pot-like thread roller braking surface is arranged outside the roller circumference, so that the diameter of the pressure roller, as well as the rest of its construction and arrangement can be made largely independent of the design of the thread roller.
  • the two rollers are arranged vertically standing on a carrier of the creel, and the pressure roller and the section of the roller axis of the thread roller having the braking surface are encapsulated in a housing.
  • the encapsulated housing of the pressure roller has the result that thread dust, fluff and the like cannot get into the area of the surfaces rolling on one another, so that the thread brake device is therefore also wear-resistant.
  • the thread roller is arranged with its thread wrapping surface above the housing and closes its passage opening in the housing except for a gap. This also contributes to sealing the interior of the housing, combined with a simple construction of the housing, which can be produced from sheet metal parts.
  • the thread wrap surface of the roller is conical in cross section.
  • the thread wrapping surface has a more inclined cone ring, at the height of which a thread inlet eyelet is arranged and which is followed by a less inclined cone ring, at whose height a thread outlet eyelet is arranged.
  • the stepped taper of the thread wrapping surface of the thread roller makes it easier to run up and pull off one or more turns of the thread, with which the thread roller can be driven without slipping even when the thread is thin and, consequently, can only be loaded to a small extent.
  • the roller axis of the thread roller is hollow and has two roller bearings clamped at a distance from one another, with which the thread roller is detachably attached to a stud of the carrier.
  • the roller bearing ensures a low friction when turning the thread roller and the roller bearings are at the same time designed so that they serve the detachable assembly of the thread roller with the support of the creel. As a result, thread rollers can be easily pulled up.
  • the standing arrangement of the thread roller contributes to the fact that it is fundamentally through it Weight supported on the stud bolt of the carrier.
  • the conical design of the thread wrapping surface also has the effect that forces originating from the thread exert vertically downward force components on the thread roller and seek to hold it on the stud bolt.
  • the roller axis is a part which is detachably fastened to the thread roller with a radial ring projection having the braking surface and / or the braking surface is, if necessary, tapered to form the thread roller.
  • a conical design of the braking surface also helps to apply the thread roller vertically downward in order to support its seat on the stud of the carrier.
  • the radial ring projection is used to give the pressure roller cover a larger contact area. This is desirable, for example, when the force transmission of the pressure roller driven by frictional entrainment requires it and the speed ratio of the two rollers allows one another.
  • the thread roller is made of light metal and its wall thickness is approximately the same size in the area of the thread wrapping surface. As a result, the thread roller can be made quite light and low-inertia even with a large outside diameter, without losing stability.
  • the thread roller has a radial ring collar arranged in the plane of the outer wall of the housing and / or the pressure roller is narrower than the thread wrapping surface of the thread roller.
  • the ring collar serves to stiffen the thread roller and also has the function of being vertical on the conical To convey the thread wrapping surface slipping dust and thread particles horizontally radially outwards across the gap to the housing.
  • the pressure roller can be kept as narrow as possible regardless of the width of the thread wrapping surface required for the thread.
  • the pressure roller is acted upon by a tension spring, which is fastened at one end to an adjusting ring which is adjustably fixed on an adjusting rod and with the other end engages on a tension ring which is supported on a radial shoulder of an adjusting rod bore of a pivotable roller axle carrier of the pressing roller.
  • a tension spring arranged in this way is particularly suitable, namely with a low pretension, to adjust the contact forces of the pressure roller very delicately, so that even with very fine thread that can only withstand low thread tension, a sufficiently sensitive adjustment of the thread tension can be carried out by means of low contact forces.
  • the roller axis centers are approximately equal to the radius of the thread roller from each other.
  • the thread roller covers the pinch roller considerably.
  • the thread braking device is also suitable for low thread tensions at high thread speeds.
  • the housing opening is so large that the screw fastening of the pressure roller to the swiveling roller axle carrier is easily accessible.
  • the encapsulated pressure roller can also be easily installed and removed.
  • the thread braking device shown in the figures has a thread roller 10, which is wound around a thread F, and a pressure roller 11, which brakes the thread roller 10. Both rollers 10, 11 are parallel-axis and fixed on a support 12 of a creel, not shown.
  • the thread roller 10 is attached rigidly to the carrier 12.
  • the pressure roller 11 is pivotally mounted so that its contact pressure is adjustable. The setting is carried out by means of an adjusting rod 13 via a tension spring 14 and a pivotable roller axle carrier 15.
  • the thread roller 10 is hollow like a pot according to FIG. 2. It consists of a pot-like roller body 16 with a depression 17 having a depression 18, to which an annular wall 19 connects on the outside.
  • the wall 19 forms a thread wrapping surface 20 and essentially consists of two cone rings 20, 21, on which the thread F according to FIG. 1 runs.
  • the cone ring 20 is closely adjacent to the base 17 except for a short cylindrical section and merges into the cone ring 21 provided with a greater inclination, to which a short cylindrical wall section 22 adjoins, which carries a radially projecting ring collar 23.
  • the wall thickness of the thread roller 10 in the area of the thread wrapping surface 20 or the roller wall 19 is approximately the same everywhere. The wall thickness is comparatively small.
  • the thread roller 10 is made of light metal and the shape of the wall described above 19 contributes to a high dimensional stability of the roller 10 with low weight and a small moment of inertia.
  • the thread roller 10 has a roller axis 24 which is formed as a separate part and is fastened to the bottom 17 of the roller body 16 with a fastening screw 25.
  • the screw head of the fastening screw 25 lies completely in the depression 18, so that the thread F is attached to it e.g. can't get caught while handling.
  • the roller axis 24 is provided with a cavity 26 which receives two roller bearings 27. These are arranged at a distance from one another and clamped on the inner wall of the roller axis 24 in such a way that they cannot be released without special tools.
  • the roller bearings 27 serve to hold the roller 10 on a stud 28 which is firmly connected to the upper leg 29 of the carrier 12 by screwing.
  • the stud 28 is fastened to the upper leg 29 of the carrier 12 in such a way that two nuts 33 are screwed onto its threaded section 32, cf. Fig. 1, which enclose the upper leg 29 between them.
  • the thread roller 10 is fastened in such a way that it is pushed with the inner recesses of the roller bearings 27 over the stud bolt 28, with a releasable jamming taking place. The jamming is sufficient, however, to hold the thread roller 10 securely against axial displacement on the stud bolt 28 during normal operation.
  • roller axle 24 has a radial ring projection 30 which has a braking surface 31 on which the pressure roller 11 rolls.
  • the braking surface 31, like the thread wrapping surface 20, can be designed conically so that a vertically downward force component is achieved with the aid of the pressure forces originating from the pressure roller 11, with which the thread roller 10 is additionally held on the stud bolt 28.
  • the pressure roller 11 is also provided with a roller bearing 34, the inner ring of which is used to fasten the pressure roller 11 with a fastening screw 35 to the roller axle carrier 15, the fastening screw 35 forming a roller axis 36.
  • the outer ring of the roller bearing 34 designed as a ball bearing carries an equally wide roller body 37, on which a cover 38 made of elastic material is seated. This cover 38 rolls with its outer circumference on the braking surface 31 of the roller axis 24 when the brake roller 10 is driven by the thread F. As a result of the contact pressure, the elastic material is tumbled, which creates friction and thus rotational resistance.
  • the roller axle carrier 15 is pivotally supported by a bearing bush 39 on a bearing axle 40 which engages with its two ends in the upper leg 29 and a lower leg 41 of the carrier 12.
  • the resulting pivoting mobility of the roller axle carrier 15 in a horizontal plane is permitted by a recess 42 in the upper leg 29, so that the neck 43 of the roller axle carrier 15 can move in the recess 42 to the extent necessary when the roller axle carrier 15 is moved through the adjusting rod 13 is adjusted.
  • the actuating force of the actuating rod 13 is transmitted via an adjusting ring 44 which is clamped on the actuating rod 13 with a grub screw 45.
  • the adjusting ring 44 has an axial projection (not visible in FIG. 1) on which a spring end 14 ⁇ of the tension spring 14 surrounding the adjusting rod 13 sits in a form-fitting manner.
  • This form-fitting attachment is designed as shown for the other spring end 14 ⁇ .
  • a pull ring 46 with an axial flange 47 serves to accommodate the Spring end 14 ⁇ , for which purpose the axial flange 47 is thread-like on its outer surface receiving the spring end 14 ⁇ , so that there is sufficient positive engagement with the turns of the spring end 14 ⁇ .
  • the pull ring 46 is supported on a radial shoulder 48 of an actuating rod bore 15 'of the roller axle carrier 15, so that forces applied to the actuating rod 13 in the direction of arrow 50 thus on the roller axle carrier 15 or on the pressure roller 11 for adjusting the contact pressure of the pressure roller 11 on the Roller axis 42 can be transmitted.
  • both rollers 10, 11 are arranged above the carrier 12, but the roller 10 sits higher than the roller 11.
  • the pressure roller 11 is consequently arranged outside the horizontal roller circumferential region of the thread roller 10 so that they overlap the pressure roller 11 can. This overlap is evidently so great that the center of the roller axis 36 is arranged at the level of the outer circumference of the thread roller 10, so that the roller axis centers are approximately equal to the radius of the thread roller 10 from one another. This results in a very space-saving design with a large radius of the roller 10.
  • the roller axis 24 extends axially far beyond the thread wrapping surface 20 and is arranged with this overlapping portion 49, which has the braking surface 21, on the vertical height of the roller 11.
  • the roller 11 and the roller axle section 49 can consequently be accommodated in a housing 50 for encapsulation.
  • This consists of a base plate 51 with raised side walls 52, one of which is extended beyond a housing cover 53 and carries a thread inlet eyelet 54 with this extension.
  • the housing cover 53 and the base plate 51 are fastened together with fastening screws 56 to the upper leg 29 of the carrier 12.
  • the housing cover 53 carries a thread outlet eyelet 55 on one side.
  • the thread inlet eyelet 54 is arranged horizontally at the height of the cone ring 21, while the thread outlet eyelet 55 is arranged horizontally at the height of the cone ring 20.
  • This thread guide ensures perfect thread take-off even if there is a risk that the overlapping thread sections or several turns could become confused due to one or more wrapping of the roller 10 by the thread F.
  • Fig. 3 shows that the overlap in the present embodiment relates to about 90 degrees.
  • the housing 50 has an opening in an outer wall 58 of the housing cover 53, which is closed by the roller 10 except for a gap 57.
  • the arrangement is such that the radial annular collar 23 of the thread roller 10 is arranged in the plane of the outer wall 58 of the housing cover 53.
  • the thread braking device is particularly suitable for high thread running speeds because a reduction takes place.
  • This reduction of the rotational speeds of the rollers 10, 11 is determined on the one hand by the ratio of the diameters 20 ⁇ , 30 ⁇ , and on the other hand by the ratio of the diameters 30 ⁇ , 11 ⁇ .
  • the pressure roller 11 only rotates at a fraction of the rotational speed of the roller 10 and the wear of the elastic cover 38 is only comparatively low.
  • the large diameter of the thread roller 10 or the consequently large opening of the housing cover 53 allows the pressure roller 11 to be removed without loosening after the roller 20 has been removed the housing cover 53 is easily accessible and can also be removed by pivoting the roller axle carrier 15.

Landscapes

  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Guides For Winding Or Rewinding, Or Guides For Filamentary Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Warping, Beaming, Or Leasing (AREA)

Description

Die Erfindung bezieht sich auf eine Fadenbremsvorrichtung, mit zwei durch parallele Rollenachsen drehbar gelagerten Rollen, von denen eine als Fadenlaufrolle topfartig hohl ausgebildet und an ihrem Außenumfang von einem Faden zumindest teilweise umschlungen ist, und von denen die andere als Andruckrolle einen Überzug aus elastischem Material hat und damit mit einstellbarem Auflagedruck an einem Umfang einer mit der Fadenlaufrolle starr verbundenen Bremsfläche anliegt und sich daran beim Abziehen des Fadens abwälzt.The invention relates to a thread braking device, with two rollers rotatably supported by parallel roller axes, one of which is hollow as a thread roller and is at least partially encircled by a thread on its outer circumference, and of which the other has a coating of elastic material as a pressure roller and thus rests with an adjustable contact pressure on a circumference of a braking surface rigidly connected to the thread roller and rolls on it when the thread is pulled off.

Eine derartige Fadenbremsvorrichtung ist aus der US-A-2 686 018 bekannt, wobei die topfartige Fadenlaufrolle an ihrem Außenumfang eine V-förmige Ringnut zur teilweisen Umschlingung durch einen Faden hat und auf Höhe dieser Ringnut einen parallel zur Rollenachse vorspringenden Bremsflansch aufweist, dessen Innenfläche die Bremsfläche bildet, auf der sich die zwischen dieser Innenfläche des Bremsflansches und der Rollenachse gelegene Andruckrolle abwälzt. Die Andruckrolle kann infolgedessen im Vergleich zur Bremsfläche der Fadenlaufrolle nur einen geringen Außendurchmesser haben, so daß sie also viel schneller rotieren muß, als die Fadenlaufrolle. Infolgedessen verschleißt ihr elastischer Überzug recht schnell. Die bekannte Fadenbremsvorrichtung ist also nicht für hohe Fadenlaufgeschwindigkeiten geeignet.Such a thread braking device is known from US-A-2 686 018, wherein the pot-like thread roller has on its outer circumference a V-shaped annular groove for partial wrapping by a thread and at the level of this annular groove has a brake flange projecting parallel to the roller axis, the inner surface of which Forms braking surface on which the pressure roller lying between this inner surface of the brake flange and the roller axis rolls. The As a result, the pressure roller can only have a small outer diameter compared to the braking surface of the thread roller, so that it must rotate much faster than the thread roller. As a result, their elastic covering wears out quite quickly. The known thread braking device is therefore not suitable for high thread running speeds.

Aus der DE-A-23 49 334 ist eine Fadenbremsvorrichtung bekannt, bei der sich zwei Bremsscheiben gleichen Außendurchmessers aufeinander abwälzen und durch Walken elastischen Materials gebremst werden. Eine Bremsscheibe trägt eine fadenumschlungene Scheibe größeren Durchmessers, um die Bremswirkung in weiteren Grenzen einstellbar zu machen. Dabei kann der Durchmesser der auf eine Bremsscheibe aufgesetzten Scheibe aber aus Konstruktionsgründen nicht viel größer sein, als die Bremsscheibe selbst und die Verschleißfestigkeit des elastischen Überzugs dieser bekannten Fadenbremsvorrichtung wird nur unmaßgeblich beeinflußt.From DE-A-23 49 334 a thread braking device is known in which two brake discs of the same outside diameter roll on each other and are braked by flexing elastic material. A brake disc carries a thread-wound disc with a larger diameter in order to make the braking effect adjustable within further limits. The diameter of the disc placed on a brake disc can, however, not be much larger than the brake disc itself for constructional reasons, and the wear resistance of the elastic coating of this known thread brake device is only influenced to an insignificant extent.

Aus der CH-A-399 858 ist eine Vorrichtung zum Konstanthalten der Drahtspannung bei Wickelmaschinen mit hohen Drehzahlen bekannt, bei der der Draht zwischen zwei Filzplättchen einer Filzvorbremse durchgezogen und in eine Klemmrille zwischen zwei eine Drahtlaufrolle bildende Stahlscheiben verläuft, aus der sich der Draht abziehen läßt. Die Drahtlaufrolle lagert außerhalb eines Gehäuses auf einer Achse, die im Gehäuseinneren eine Bremsfläche aufweist, an der eine Andruckrolle mit einem Überzug aus elastischem Material abläuft, deren Anpreßdruck einstellbar ist. Er kann durch einen Schwenkhebel gemindert bzw. ganz aufgehoben werden, der ablaufseitig der Vorrichtung vom ablaufenden Draht beaufschlagt wird. Diese für Draht bestimmte Bremsvorrichtung ist zum Fadenbremsen nicht geeignet und insbesondere in Verbindung mit Spulengattern wegen des erheblichen baulichen Aufwandes mit Vorbremse und Bremsentlastung nicht wirtschaftlich einzusetzen.From CH-A-399 858 a device for keeping the wire tension constant in winding machines with high speeds is known, in which the wire is pulled between two felt pads of a felt pre-brake and runs into a clamping groove between two steel disks forming a wire roller, from which the wire is pulled leaves. The wire roller is mounted outside of a housing on an axis which has a braking surface inside the housing, on which a pressure roller with a coating of elastic material runs, the contact pressure of which is adjustable. It can be reduced or completely canceled by a swivel lever which is acted upon by the running wire on the outlet side of the device. This brake device intended for wire is not suitable for thread braking and, in particular in conjunction with creel gates, cannot be used economically because of the considerable structural effort with the pre-brake and brake relief.

Aus der US-A-2 738 937 ist eine Fadenbremse bekannt, die im wesentlichen aus einer einzigen vom Faden umschlungenen Fadenlaufrolle besteht, welche topfartig hohl ausgebildet ist und sich oberhalb einer elektromagnetisch wirkenden Bremse befindet, die auf die Drehachse der Fadenlaufrolle bremsend einwirkt. Ein mechanischer Verschleiß der an dem Bremsvorgang beteiligten mechanischen Teile tritt aufgrund der elektromagnetischen Wirkung der Bremsvorrichtung naturgemäß nicht auf.From US-A-2 738 937 a thread brake is known which consists essentially of a single thread roller wound around the thread, which is hollow like a pot and is located above an electromagnetic brake which acts on the axis of rotation of the thread roller to brake. Mechanical wear of the mechanical parts involved in the braking process naturally does not occur due to the electromagnetic effect of the braking device.

Der Erfindung liegt die Aufgabe zugrunde, eine Fadenbremsvorrichtung der eingangs genannten Art so zu verbessern, daß sie bei den erforderlichen hohen Fadenlaufgeschwindigkeiten wesentlich verschleißfester ist, ohne dazu für ihren Aufbau einen erheblichen baulichen Aufwand zu benötigen.The invention has for its object to improve a thread brake device of the type mentioned so that it is much more wear resistant at the required high thread speeds, without the need for a significant structural effort for its construction.

Diese Aufgabe wird dadurch gelöst, daß die beiden Rollen oberhalb eines Trägers eines Spulengatters mit vertikalen Achsen stehend angeordnet sind, daß die Bremsfläche der Andruckrolle an der Rollenachse der topfartigen Fadenlaufrolle zwischen dieser und dem Träger angeordnet ist, daß die Fadenlaufrolle oberhalb des Trägers höher sitzt, als die unter ihr gegen die Bremsfläche gedrückte Andruckrolle, wobei die Rollenachsenmitten etwa gleich dem Radius der Fadenlaufrolle voneinander entfernt sind, daß die Andruckrolle und ein die Bremsfläche aufweisender Abschnitt der Rollenachse in einem Gehäuse gekapselt untergebracht sind, das auf dem Träger befestigt ist, daß die mit ihrer Fadenumschlingungsfläche oberhalb des Gehäuses angeordnete Fadenlaufrolle ihre Durchtrittsöffnung im Gehäuse mit einem in der Ebene einer Gehäuse-Außenwand angeordneten radialen Ringkragen bis auf einen Spalt verschließt und daß der Rollenachsen durchmesser der topfartigen Fadenlaufrolle im Bereich der Bremsfläche kleiner als der Durchmesser der Andruckrolle ist.This object is achieved in that the two rollers are arranged upright above a carrier of a creel with vertical axes, that the braking surface of the pressure roller is arranged on the roller axis of the pot-like thread roller between the latter and the carrier, that the thread roller sits higher above the carrier, than the pressure roller pressed beneath it against the braking surface, the roller axis centers being approximately equal to the radius of the thread roller, the pressure roller and a section of the roller axis having the braking surface are encapsulated in a housing which is fastened to the carrier such that the with its thread wrapping surface arranged above the housing thread roller closes its passage opening in the housing with a radial ring collar arranged in the plane of a housing outer wall except for a gap and that the roller axes diameter of the pot-like thread roller in the B the braking surface is smaller than the diameter of the pressure roller.

Für die Erfindung ist von Bedeutung, daß die Bremsfläche der Fadenlaufrolle einen sehr kleinen Durchmesser haben kann, indem die Rollenachse der topfartigen Fadenlaufrolle selbst die Bremsfläche bildet, so daß eine Untergrenze für den Durchmesser der Bremsfläche praktisch nur durch die aus mechanischen Gründen erforderliche Stärke der Rollenachse gegeben ist. Es findet eine Übersetzung der Umfangsgeschwindigkeiten der Bremsfläche ins Schnelle statt, so daß also die Umfangsgeschwindigkeit an der Bremsfläche auch bei hohen Fadenlaufgeschwindigkeiten verhältnismäßig gering ist. Infolgedessen ist auch der Verschleiß des elastischen Überzugs der Andruckrolle vergleichsweise gering, zumal der Durchmesser im Bereich der Bremsfläche kleiner als der Durchmesser der Andruckrolle sein kann. Letzteres bedeutet eine Untersetzung in dem Sinne, daß sich die Andruckrolle aufgrund ihres größeren Durchmessers im Vergleich zur Fadenlaufrolle wesentlich langsamer drehen kann. Beispielsweise dreht sich die Andruckrolle nur halb so schnell, wie die Fadenlaufrolle, so daß auch aus diesem Grunde eine erhebliche Verminderung des Verschleißes der Andruckrolle erreicht wird.It is important for the invention that the braking surface of the thread roller can have a very small diameter in that the roller axis of the pot-like thread roller itself forms the braking surface, so that a lower limit for the diameter of the braking surface is practically given only by the thickness of the roller axis required for mechanical reasons. There is a translation of the peripheral speeds of the braking surface into rapid, so that the peripheral speed on the braking surface is relatively low even at high yarn speeds. As a result, the wear of the elastic coating of the pressure roller is comparatively low, especially since the diameter in the area of the braking surface can be smaller than the diameter of the pressure roller. The latter means a reduction in the sense that the pressure roller can rotate much more slowly compared to the thread roller due to its larger diameter. For example, the pinch roller rotates only half as fast as the thread roller, so that a considerable reduction in wear on the pinch roller is also achieved for this reason.

Die an der Rollenachse der topfartigen Fadenlaufrolle angeordnete Bremsfläche ist außerhalb des Rollenumfangs angeordnet, so daß der Durchmesser der Andruckrolle, wie auch deren übrige Konstruktion und Anordnung weitgehend unabhängig von der Gestaltung der Fadenlaufrolle vorgenommen werden kann.The arranged on the roller axis of the pot-like thread roller braking surface is arranged outside the roller circumference, so that the diameter of the pressure roller, as well as the rest of its construction and arrangement can be made largely independent of the design of the thread roller.

Vorteilhafterweise sind die beiden Rollen vertikal stehend an einem Träger des Spulengatters angeordnet, und die Andruckrolle und der die Bremsfläche aufweisende Abschnitt der Rollenachse der Fadenlaufrolle sind in einem Gehäuse gekapselt untergebracht. Die gekapselte Unterbringung der Andruckrolle hat zur Folge, daß Fadenstäube, Flusen und dergleichen nicht in den Bereich der aufeinander abrollenden Flächen gelangen können, so daß die Fadenbremsvorrichtung auch daher verschleißfest ist.Advantageously, the two rollers are arranged vertically standing on a carrier of the creel, and the pressure roller and the section of the roller axis of the thread roller having the braking surface are encapsulated in a housing. The encapsulated housing of the pressure roller has the result that thread dust, fluff and the like cannot get into the area of the surfaces rolling on one another, so that the thread brake device is therefore also wear-resistant.

Die Fadenlaufrolle ist mit ihrer Fadenumschlingungsfläche oberhalb des Gehäuses angeordnet und verschließt ihre Durchtrittsöffnung im Gehäuse bis auf einen Spalt. Auch das trägt zu einer Abdichtung des Innenraums des Gehäuses bei, verbunden mit einer einfachen Konstruktion des Gehäuses, das aus Blechteilen hergestellt werden kann.The thread roller is arranged with its thread wrapping surface above the housing and closes its passage opening in the housing except for a gap. This also contributes to sealing the interior of the housing, combined with a simple construction of the housing, which can be produced from sheet metal parts.

Die Fadenumschlingungsfläche der Laufrolle ist im Querschnitt konusförmig ausgebildet. Infolgedessen gleitet der die Fadenlaufrolle umschlingende und dadurch antreibende gezogene Faden in Richtung der Verjüngung ab und schafft Platz für eine weitere Fadenwindung bzw. für den stets neu zulaufenden Fadenabschnitt.The thread wrap surface of the roller is conical in cross section. As a result, the drawn thread that wraps around the thread roller and thereby drives it slides in the direction of the taper and creates space for a further thread turn or for the thread portion that is always new.

Die Fadenumschlingungsfläche hat einen stärker geneigten Konusring, auf dessen Höhe eine Fadeneinlauföse angeordnet ist und an den sich ein schwächer geneigter Konusring anschließt, auf dessen Höhe eine Fadenauslauföse angeordnet ist. Die gestufte Konizität der Fadenumschlingungsfläche der Fadenlaufrolle erleichtert das Auflaufen und Abziehen einer oder mehrerer Windungen des Fadens, mit denen die Fadenlaufrolle auch dann rutschfrei angetrieben werden kann, wenn der Faden dünn und infolgedessen nur in geringem Umfange belastbar ist.The thread wrapping surface has a more inclined cone ring, at the height of which a thread inlet eyelet is arranged and which is followed by a less inclined cone ring, at whose height a thread outlet eyelet is arranged. The stepped taper of the thread wrapping surface of the thread roller makes it easier to run up and pull off one or more turns of the thread, with which the thread roller can be driven without slipping even when the thread is thin and, consequently, can only be loaded to a small extent.

Die Rollenachse der Fadenlaufrolle ist hohl und weist zwei mit Abstand voneinander festgeklemmte Wälzlager auf, mit denen die Fadenlaufrolle auf einen Stehbolzen des Trägers lösbar aufgesteckt ist. Die Wälzlagerung sorgt für eine geringe Reibung beim Drehen der Fadenlaufrolle und die Wälzlager sind zugleich so ausgebildet, daß sie dem lösbaren Zusammenbau der Fadenlaufrolle mit dem Träger des Spulengatters dienen. Infolgedessen können Fadenlaufrollen in einfacher Weise nach oben abgezogen werden. Die stehende Anordnung der Fadenlaufrolle trägt dazu bei, daß sich diese grundsätzlich durch ihr Eigengewicht auf dem Stehbolzen des Trägers abstützt. Die konusförmige Ausgestaltung der Fadenumschlingungsfläche bewirkt auch, daß vom Faden herrührende Kräfte vertikal abwärts gerichtete Kraftkomponenten auf die Fadenlaufrolle ausüben und diese auf dem Stehbolzen zu halten suchen.The roller axis of the thread roller is hollow and has two roller bearings clamped at a distance from one another, with which the thread roller is detachably attached to a stud of the carrier. The roller bearing ensures a low friction when turning the thread roller and the roller bearings are at the same time designed so that they serve the detachable assembly of the thread roller with the support of the creel. As a result, thread rollers can be easily pulled up. The standing arrangement of the thread roller contributes to the fact that it is fundamentally through it Weight supported on the stud bolt of the carrier. The conical design of the thread wrapping surface also has the effect that forces originating from the thread exert vertically downward force components on the thread roller and seek to hold it on the stud bolt.

Die Rollenachse ist ein an der Fadenlaufrolle lösbar befestigtes Teil mit einem die Bremsfläche aufweisenden Radialringvorsprung und/oder die Bremsfläche ist bedarfsweise zur Fadenlaufrolle verjüngt konusförmig ausgebildet. Auch eine derartige konusförmige Ausbildung der Bremsfläche trägt dazu bei, die Fadenlaufrolle vertikal abwärts zu beaufschlagen, um deren Sitz auf dem Stehbolzen des Trägers zu unterstützen. Der Radialringvorsprung dient dazu, dem Überzug der Andruckrolle eine größere Auflagefläche geben zu können. Das ist beispielsweise dann erwünscht, wenn es die Kraftübertragung der durch Reibungsmitnahme angetriebenen Andruckrolle erfordert und es das Drehzahlverhältnis der beiden Rollen zueinander zuläßt.The roller axis is a part which is detachably fastened to the thread roller with a radial ring projection having the braking surface and / or the braking surface is, if necessary, tapered to form the thread roller. Such a conical design of the braking surface also helps to apply the thread roller vertically downward in order to support its seat on the stud of the carrier. The radial ring projection is used to give the pressure roller cover a larger contact area. This is desirable, for example, when the force transmission of the pressure roller driven by frictional entrainment requires it and the speed ratio of the two rollers allows one another.

Die Fadenlaufrolle besteht aus Leichtmetall und ihre Wandstärke ist im Bereich der Fadenumschlingungsfläche etwa gleich groß. Die Fadenlaufrolle kann infolgedessen auch bei einem großem Außendurchmesser recht leicht und trägheitsarm ausgebildet werden, ohne an Stabilität einzubüßen.The thread roller is made of light metal and its wall thickness is approximately the same size in the area of the thread wrapping surface. As a result, the thread roller can be made quite light and low-inertia even with a large outside diameter, without losing stability.

Die Fadenlaufrolle weist einen in der Ebene der Außenwand des Gehäuses angeordneten radialen Ringkragen auf und/oder die Andruckrolle ist schmaler als die Fadenumschlingungsfläche der Fadenlaufrolle. Der Ringkragen dient der Versteifung der Fadenlaufrolle und hat außerdem die Funktion, vertikal auf der konusförmigen Fadenumschlingungsfläche abrutschende Staub- und Fadenteilchen horizontal radial nach außen über den Spalt hinweg zum Gehäuse zu fördern. Die Andruckrolle kann unabhängig von der für den Faden benötigten Breite der Fadenumschlingungsfläche so schmal wie möglich gehalten werden.The thread roller has a radial ring collar arranged in the plane of the outer wall of the housing and / or the pressure roller is narrower than the thread wrapping surface of the thread roller. The ring collar serves to stiffen the thread roller and also has the function of being vertical on the conical To convey the thread wrapping surface slipping dust and thread particles horizontally radially outwards across the gap to the housing. The pressure roller can be kept as narrow as possible regardless of the width of the thread wrapping surface required for the thread.

Die Andruckrolle ist von einer Zugfeder beaufschlagt, die mit einem Ende an einem auf einer Stellstange justierbar festgelegten Stellring befestigt ist und mit dem anderen Ende an einem Zugring angreift, der sich an einer Radialschulter einer Stellstangenbohrung eines schwenkbeweglichen Rollachsenträgers der Andruckrolle abstützt. Eine derart angeordnete Zugfeder ist insbesondere geeignet, nämlich bei geringer Vorspannung, die Auflagekräfte der Andruckrolle sehr feinfühlig einzustellen, damit auch bei sehr feinem, nur geringe Fadenspannung aushaltendem Faden eine hinreichend feinfühlige Einstellung der Fadenspannung mittels geringer Auflagekräfte vorgenommen werden kann.The pressure roller is acted upon by a tension spring, which is fastened at one end to an adjusting ring which is adjustably fixed on an adjusting rod and with the other end engages on a tension ring which is supported on a radial shoulder of an adjusting rod bore of a pivotable roller axle carrier of the pressing roller. A tension spring arranged in this way is particularly suitable, namely with a low pretension, to adjust the contact forces of the pressure roller very delicately, so that even with very fine thread that can only withstand low thread tension, a sufficiently sensitive adjustment of the thread tension can be carried out by means of low contact forces.

Die Rollenachsenmitten sind etwa gleich dem Radius der Fadenlaufrolle voneinander entfernt. Die Fadenlaufrolle überdeckt infolgedessen die Andruckrolle beträchtlich. Die Fadenbremsvorrichtung ist auch infolgedessen für geringe Fadenspannungen bei hohen Fadenlaufgeschwindigkeiten geeignet. Bei abgenommener Fadenlaufrolle ist die Gehäuseöffnung so groß, daß die Schraubbefestigung der Andruckrolle an dem schwenkbeweglichen Rollenachsenträger leicht zugänglich ist. Infolgedessen kann auch die abgekapselt angeordnete Andruckrolle leicht ein- und ausgebaut werden.The roller axis centers are approximately equal to the radius of the thread roller from each other. As a result, the thread roller covers the pinch roller considerably. As a result, the thread braking device is also suitable for low thread tensions at high thread speeds. When the thread roller is removed, the housing opening is so large that the screw fastening of the pressure roller to the swiveling roller axle carrier is easily accessible. As a result, the encapsulated pressure roller can also be easily installed and removed.

Die Erfindung wird anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert. Es zeigt:

Fig. 1
einen vertikalen Längsschnitt durch eine Fadenbremsvorrichtung,
Fig. 2
den Schnitt gemäß der Linie II-II der Fig. 1 und
Fig. 3
die Ansicht A der Fig. 1.
The invention is explained with reference to an embodiment shown in the drawing. It shows:
Fig. 1
a vertical longitudinal section through a thread braking device,
Fig. 2
the section along the line II-II of Fig. 1 and
Fig. 3
the view A of Fig. 1st

Die in den Figuren dargestellte Fadenbremsvorrichtung hat eine Fadenlaufrolle 10, die von einem Faden F umschlungen ist, und eine Andruckrolle 11, welche die Fadenlaufrolle 10 bremst. Beide Rollen 10, 11 sind parallelachsig und stehend an einem Träger 12 eines nicht näher dargestellten Spulengatters befestigt. Die Befestigung der Fadenlaufrolle 10 am Träger 12 erfolgt starr. Die Andruckrolle 11 ist schwenkbeweglich gelagert, so daß ihr Auflagedruck einstellbar ist. Die Einstellung wird mittels einer Stellstange 13 über eine Zugfeder 14 und einen schwenkbeweglichen Rollenachsenträger 15 vorgenommen.The thread braking device shown in the figures has a thread roller 10, which is wound around a thread F, and a pressure roller 11, which brakes the thread roller 10. Both rollers 10, 11 are parallel-axis and fixed on a support 12 of a creel, not shown. The thread roller 10 is attached rigidly to the carrier 12. The pressure roller 11 is pivotally mounted so that its contact pressure is adjustable. The setting is carried out by means of an adjusting rod 13 via a tension spring 14 and a pivotable roller axle carrier 15.

Die Fadenlaufrolle 10 ist gemäß Fig. 2 topfartig hohl ausgebildet. Sie besteht aus einem topfartigen Rollenkörper 16 mit einem eine Einsenkung 18 aufweisenden Boden 17, an den außen eine ringartige Wand 19 anschließt. Die Wand 19 bildet eine Fadenumschlingungsfläche 20 und besteht im wesentlichen aus zwei Konusringen 20, 21, auf die der Faden F gemäß Fig. 1 aufläuft. Der Konusring 20 ist dem Boden 17 bis auf einen kurzen zylindrischen Abschnitt dicht benachbart und geht in den mit größerer Neigung versehenen Konusring 21 über, an den sich ein kurzer zylindrischer Wandabschnitt 22 anschließt, der einen radial vorspringenden Ringkragen 23 trägt. Die Wandstärke der Fadenlaufrolle 10 im Bereich der Fadenumschlingungsfläche 20 bzw. die Rollenwand 19 ist überall etwa gleich stark. Die Wandstärke ist vergleichsweise gering. Die Fadenlaufrolle 10 besteht aus Leichtmetall und die vorbeschriebene Formgebung der Wand 19 trägt zu einer hohen Formstabilität der Rolle 10 bei geringem Gewicht und kleinem Drehträgheitsmoment bei.The thread roller 10 is hollow like a pot according to FIG. 2. It consists of a pot-like roller body 16 with a depression 17 having a depression 18, to which an annular wall 19 connects on the outside. The wall 19 forms a thread wrapping surface 20 and essentially consists of two cone rings 20, 21, on which the thread F according to FIG. 1 runs. The cone ring 20 is closely adjacent to the base 17 except for a short cylindrical section and merges into the cone ring 21 provided with a greater inclination, to which a short cylindrical wall section 22 adjoins, which carries a radially projecting ring collar 23. The wall thickness of the thread roller 10 in the area of the thread wrapping surface 20 or the roller wall 19 is approximately the same everywhere. The wall thickness is comparatively small. The thread roller 10 is made of light metal and the shape of the wall described above 19 contributes to a high dimensional stability of the roller 10 with low weight and a small moment of inertia.

Die Fadenlaufrolle 10 hat eine Rollenachse 24, die als separates Teil ausgebildet und mit einer Befestigungsschraube 25 am Boden 17 des Rollenkörpers 16 befestigt ist. Der Schraubenkopf der Befestigungsschraube 25 liegt dabei vollständig in der Einsenkung 18, so daß sich der Faden F hieran z.B. beim Hantieren nicht verfangen kann. Die Rollenachse 24 ist mit einem Hohlraum 26 versehen, der zwei Wälzlager 27 aufnimmt. Diese sind mit Abstand voneinander angeordnet und an der Innenwand der Rollenachse 24 derart festgeklemmt, daß sie nicht ohne Spezialwerkzeug lösbar sind. Die Wälzlager 27 dienen der Halterung der Rolle 10 auf einem Stehbolzen 28, der mit dem oberen Schenkel 29 des Trägers 12 durch Verschraubung fest verbunden ist. Die Befestigung des Stehbolzens 28 an dem oberen Schenkel 29 des Trägers 12 erfolgt derart, daß auf dessen Gewindeabschnitt 32 zwei Muttern 33 aufgeschraubt werden, vgl. Fig. 1, welche den oberen Schenkel 29 zwischen sich einschließen. Die Befestigung der Fadenlaufrolle 10 erfolgt derart, daß sie mit den Innenausnehmungen der Wälzlager 27 über den Stehbolzen 28 geschoben wird, wobei eine lösbare Verklemmung erfolgt. Die Verklemmung reicht jedoch aus, um die Fadenlaufrolle 10 bei normalem Betrieb gegen axiales Verschieben auf dem Stehbolzen 28 sicher zu halten.The thread roller 10 has a roller axis 24 which is formed as a separate part and is fastened to the bottom 17 of the roller body 16 with a fastening screw 25. The screw head of the fastening screw 25 lies completely in the depression 18, so that the thread F is attached to it e.g. can't get caught while handling. The roller axis 24 is provided with a cavity 26 which receives two roller bearings 27. These are arranged at a distance from one another and clamped on the inner wall of the roller axis 24 in such a way that they cannot be released without special tools. The roller bearings 27 serve to hold the roller 10 on a stud 28 which is firmly connected to the upper leg 29 of the carrier 12 by screwing. The stud 28 is fastened to the upper leg 29 of the carrier 12 in such a way that two nuts 33 are screwed onto its threaded section 32, cf. Fig. 1, which enclose the upper leg 29 between them. The thread roller 10 is fastened in such a way that it is pushed with the inner recesses of the roller bearings 27 over the stud bolt 28, with a releasable jamming taking place. The jamming is sufficient, however, to hold the thread roller 10 securely against axial displacement on the stud bolt 28 during normal operation.

Außerdem besitzt die Rollenachse 24 einen Radialringvorsprung 30, der eine Bremsfläche 31 aufweist, auf der sich die Andruckrolle 11 abwälzt. Die Bremsfläche 31 kann, wie die Fadenumschlingsungsfläche 20, konisch ausgebildet werden, damit mit Hilfe der von der Andruckrolle 11 herrührenden Andruckkräfte eine vertikal nach unten gerichtete Kraftkomponente erzielt wird, mit der die Fadenlaufrolle 10 zusätzlich auf dem Stehbolzen 28 gehalten wird.In addition, the roller axle 24 has a radial ring projection 30 which has a braking surface 31 on which the pressure roller 11 rolls. The braking surface 31, like the thread wrapping surface 20, can be designed conically so that a vertically downward force component is achieved with the aid of the pressure forces originating from the pressure roller 11, with which the thread roller 10 is additionally held on the stud bolt 28.

Die Andruckrolle 11 ist ebenfalls mit einem Wälzlager 34 versehen, dessen Innenring der Befestigung der Andruckrolle 11 mit einer Befestigungsschraube 35 an dem Rollenachsenträger 15 dient, wobei die Befestigungsschraube 35 eine Rollenachse 36 bildet. Der Außenring des als Kugellager ausgebildeten Wälzlagers 34 trägt einen ebenso breiten Rollenkörper 37, auf dem ein Überzug 38 aus elastischem Material sitzt. Dieser Überzug 38 wälzt sich mit seinem Außenumfang auf der Bremsfläche 31 der Rollenachse 24 ab, wenn die Bremsrolle 10 durch den Faden F angetrieben wird. Infolge des Auflagedrucks wird das elastische Material gewalkt, wodurch Reibung und damit Drehwiderstand entsteht.The pressure roller 11 is also provided with a roller bearing 34, the inner ring of which is used to fasten the pressure roller 11 with a fastening screw 35 to the roller axle carrier 15, the fastening screw 35 forming a roller axis 36. The outer ring of the roller bearing 34 designed as a ball bearing carries an equally wide roller body 37, on which a cover 38 made of elastic material is seated. This cover 38 rolls with its outer circumference on the braking surface 31 of the roller axis 24 when the brake roller 10 is driven by the thread F. As a result of the contact pressure, the elastic material is tumbled, which creates friction and thus rotational resistance.

Der Rollenachsenträger 15 wird gemäß Fig. 2 schwenkbeweglich von einer Lagerbuchse 39 auf einer Lagerachse 40 gelagert, die mit ihren beiden Enden in den oberen Schenkel 29 und einen unteren Schenkel 41 des Trägers 12 eingreift. Die dadurch gegebene Schwenkbeweglichkeit des Rollenachsenträgers 15 in einer horizontalen Ebene wird durch eine Ausnehmung 42 des oberen Schenkels 29 zugelassen, so daß sich also der Hals 43 des Rollenachsenträgers 15 in der Ausnehmung 42 im erforderlichen Maße bewegen kann, wenn der Rollenachsenträger 15 durch die Stellstange 13 verstellt wird.2, the roller axle carrier 15 is pivotally supported by a bearing bush 39 on a bearing axle 40 which engages with its two ends in the upper leg 29 and a lower leg 41 of the carrier 12. The resulting pivoting mobility of the roller axle carrier 15 in a horizontal plane is permitted by a recess 42 in the upper leg 29, so that the neck 43 of the roller axle carrier 15 can move in the recess 42 to the extent necessary when the roller axle carrier 15 is moved through the adjusting rod 13 is adjusted.

Die Stellkraft der Stellstange 13 wird über einen Stellring 44 übertragen, der auf der Stellstange 13 mit einer Madenschraube 45 festgeklemmt ist. Der Stellring 44 hat einen in der Fig. 1 nicht sichtbaren axialen Vorsprung, auf den ein Federende 14ʹ der die Stellstange 13 umgebenden Zugfeder 14 formschlüssig sitzt. Diese formschlüssige Befestigung ist so ausgebildet, wie für das andere Federende 14ʺ dargestellt. Hier dient ein Zugring 46 mit einem Axialflansch 47 der Aufnahme des Federendes 14ʺ, wozu der Axialflansch 47 auf seiner das Federende 14ʺ aufnehmenden Außenfläche gewindeartig ausgebildet ist, so daß sich ein hinreichender Formschluß mit den Windungen des Federenes 14ʺ ergibt. Der Zugring 46 stützt sich an einer Radialschulter 48 einer Stellstangenbohrung 15' des Rollenachsenträgers 15 ab, so daß in Richtung des Pfeils 50 aufgebrachte Kräfte der Stellstange 13 damit auf den Rollenachsenträger 15 bzw. auf die Andruckrolle 11 zur Einstellung des Auflagedrucks der Andruckrolle 11 auf die Rollenachse 42 übertragen werden können.The actuating force of the actuating rod 13 is transmitted via an adjusting ring 44 which is clamped on the actuating rod 13 with a grub screw 45. The adjusting ring 44 has an axial projection (not visible in FIG. 1) on which a spring end 14ʹ of the tension spring 14 surrounding the adjusting rod 13 sits in a form-fitting manner. This form-fitting attachment is designed as shown for the other spring end 14ʺ. Here, a pull ring 46 with an axial flange 47 serves to accommodate the Spring end 14ʺ, for which purpose the axial flange 47 is thread-like on its outer surface receiving the spring end 14ʺ, so that there is sufficient positive engagement with the turns of the spring end 14ʺ. The pull ring 46 is supported on a radial shoulder 48 of an actuating rod bore 15 'of the roller axle carrier 15, so that forces applied to the actuating rod 13 in the direction of arrow 50 thus on the roller axle carrier 15 or on the pressure roller 11 for adjusting the contact pressure of the pressure roller 11 on the Roller axis 42 can be transmitted.

Gemäß Fig. 1 sind beide Rollen 10, 11 oberhalb des Trägers 12 angeordnet, wobei jedoch die Rolle 10 höher sitzt, als die Rolle 11. Die Andruckrolle 11 ist infolgedessen außerhalb des horizontalen Rollenumfangsbereichs der Fadenlaufrolle 10 angeordnet, so daß diese die Andruckrolle 11 überlappen kann. Diese Überlappung ist ersichtlich so groß, daß die Mitte der Rollenachse 36 auf der Höhe des Außenumfangs der Fadenlaufrolle 10 angeordnet ist, so daß die Rollenachsenmitten etwa gleich dem Radius der Fadenlaufrolle 10 voneinander entfernt sind. Das ergibt eine sehr raumsparende Bauweise bei großem Radius der Rolle 10.1, both rollers 10, 11 are arranged above the carrier 12, but the roller 10 sits higher than the roller 11. The pressure roller 11 is consequently arranged outside the horizontal roller circumferential region of the thread roller 10 so that they overlap the pressure roller 11 can. This overlap is evidently so great that the center of the roller axis 36 is arranged at the level of the outer circumference of the thread roller 10, so that the roller axis centers are approximately equal to the radius of the thread roller 10 from one another. This results in a very space-saving design with a large radius of the roller 10.

Wegen der übereinander geschachtelten Bauweise der Rollen 10, 11 greift die Rollenachse 24 axial weit über die Fadenumschlingungsfläche 20 hinaus und ist mit diesem übergreifenden, die Bremsfläche 21 aufweisenden Abschnitt 49 auf der vertikalen Höhe der Rolle 11 angeordnet. Die Rolle 11 und der Rollenachsenabschnitt 49 können infolgedessen zur Abkapselung in einem Gehäuse 50 untergebracht werden. Dieses besteht aus einem Bodenblech 51 mit hochgezogenen Seitenwänden 52, von denen eine über einen Gehäusedeckel 53 hinaus verlängert ist und mit dieser Verlängerung eine Fadeneinlauföse 54 trägt. Der Gehäusedeckel 53 und das Bodenblech 51 werden gemeinsam mit Befestigungsschrauben 56 am oberen Schenkel 29 des Trägers 12 befestigt. Der Gehäusedeckel 53 trägt an einer Seite eine Fadenauslauföse 55. Die Fadeneinlauföse 54 ist horizontal auf der Höhe des Konusrings 21 angeordnet, während die Fadenauslauföse 55 horizontal auf der Höhe des Konusrings 20 angeordnet ist. Daraus ergibt sich der aus Fig. 1 ersichtliche Verlauf des Fadens F auf der Fadenumschlingungsfläche 21, wobei der auf die Fadenlaufrolle 10 auflaufende Fadenabschnitt zunächst auf den Konusring 21 gelangt, dann bei Drehen der Rolle 10 und infolge der Fadenzugkraft abrutscht und auf den Konusring 20 gelangt, von dem der Faden die Laufrolle 10 verläßt und durch die Öse 55 geführt einer Wickelmaschine zugeleitet wird, die die Fadenzugkraft aufbringt. Diese Fadenführung sichert einwandfreien Fadenabzug auch dann, wenn infolge ein oder mehrfacher Umschlingung der Rolle 10 durch den Faden F die Gefahr bestünde, daß sich die überlappenden Fadenabschnitte bzw. mehrere Windungen verwirren könnten. Fig. 3 läßt erkennen, daß die Überlappung in dem hier vorliegenden Ausführungsbeispiel etwa 90 Bogengrad betrifft.Because of the stacked construction of the rollers 10, 11, the roller axis 24 extends axially far beyond the thread wrapping surface 20 and is arranged with this overlapping portion 49, which has the braking surface 21, on the vertical height of the roller 11. The roller 11 and the roller axle section 49 can consequently be accommodated in a housing 50 for encapsulation. This consists of a base plate 51 with raised side walls 52, one of which is extended beyond a housing cover 53 and carries a thread inlet eyelet 54 with this extension. The housing cover 53 and the base plate 51 are fastened together with fastening screws 56 to the upper leg 29 of the carrier 12. The housing cover 53 carries a thread outlet eyelet 55 on one side. The thread inlet eyelet 54 is arranged horizontally at the height of the cone ring 21, while the thread outlet eyelet 55 is arranged horizontally at the height of the cone ring 20. This results in the course of the thread F shown in FIG. 1 on the thread wrapping surface 21, the thread section running onto the thread roller 10 first coming onto the cone ring 21, then slipping when the roller 10 is rotated and as a result of the thread pulling force and reaching the cone ring 20 , from which the thread leaves the roller 10 and is passed through the eyelet 55 to a winding machine which applies the thread tension. This thread guide ensures perfect thread take-off even if there is a risk that the overlapping thread sections or several turns could become confused due to one or more wrapping of the roller 10 by the thread F. Fig. 3 shows that the overlap in the present embodiment relates to about 90 degrees.

Das Gehäuse 50 hat in einer Außenwand 58 des Gehäusedeckels 53 eine Ausnehmung, welche durch die Rolle 10 bis auf einen Spalt 57 verschlossen wird. Dabei ist die Anordnung so getroffen, daß der radiale Ringkragen 23 der Fadenlaufrolle 10 in der Ebene der Außenwand 58 des Gehäusdeckels 53 angeordnet ist.The housing 50 has an opening in an outer wall 58 of the housing cover 53, which is closed by the roller 10 except for a gap 57. The arrangement is such that the radial annular collar 23 of the thread roller 10 is arranged in the plane of the outer wall 58 of the housing cover 53.

Insbesondere aus Fig. 3 ergibt sich eine Veranschaulichung der unterschiedlichen Durchmesser der sich drehenden Bauteile. Es ist ersichtlich, daß der Außendurchmesser 11ʹ der Rolle 11 größer ist, als der Außendurchmesser 30ʹ des die Bremsfläche 31 aufweisenden Radialringvorsprungs 30. Beide Durchmesser 11ʹ, 30ʹ sind kleiner, als der Durchmesser 20ʹ der Fadenumschlingungsfläche 20. Hieraus ergibt sich, daß die Fadenbremsvorrichtung insbesondere für hohe Fadenlaufgeschwindigkeiten geeignet ist, weil eine Untersetzung stattfindet. Diese Untersetzung der Rotationsgeschwindigkeiten der Rollen 10, 11 wird zum einen durch das Verhältnis der Durchmesser 20ʹ, 30ʹ bestimmt, und zum anderen durch das Verhältnis der Durchmesser 30ʹ, 11ʹ. Infolgedessen dreht sich die Andruckrolle 11 nur mit einem Bruchteil der Rotationsgeschwindigkeit der Rolle 10 und der Verschleiß des elastischen Überzugs 38 ist nur vergleichsweise gering. Sollten es eine lange Laufdauer oder erhebliche Anpreßkräfte doch einmal erfordern, daß die Andruckrolle 11 ausgebaut werden muß, gestattet es der große Durchmesser der Fadenlaufrolle 10 bzw. die infolgedessen große Öffnung des Gehäusedeckels 53, daß die Andruckrolle 11 nach Entfernen der Rolle 20 auch ohne Lösen des Gehäusedeckels 53 problemlos zugänglich ist und unter Verschwenken des Rollenachsenträgers 15 auch ausgebaut werden kann.3 in particular shows the different diameters of the rotating components. It can be seen that the outer diameter 11ʹ of the roller 11 is larger than the outer diameter 30ʹ of the braking surface 31 Radial ring projection 30. Both diameters 11ʹ, 30ʹ are smaller than the diameter 20ʹ of the thread wrapping surface 20. From this it follows that the thread braking device is particularly suitable for high thread running speeds because a reduction takes place. This reduction of the rotational speeds of the rollers 10, 11 is determined on the one hand by the ratio of the diameters 20ʹ, 30ʹ, and on the other hand by the ratio of the diameters 30ʹ, 11ʹ. As a result, the pressure roller 11 only rotates at a fraction of the rotational speed of the roller 10 and the wear of the elastic cover 38 is only comparatively low. Should it require a long running time or considerable contact forces that the pressure roller 11 must be removed, the large diameter of the thread roller 10 or the consequently large opening of the housing cover 53 allows the pressure roller 11 to be removed without loosening after the roller 20 has been removed the housing cover 53 is easily accessible and can also be removed by pivoting the roller axle carrier 15.

Claims (9)

  1. Yarn brake device comprising two rollers (10,11) mounted rotatably on parallel roller shafts (24,36), one of said rollers being formed as a hollow cup-shaped yarn contact roller which has a yarn (F) looping at least partially around its external periphery, and the other roller being a pressure roller having an overlay (38) of elastic material and consequently being able to contact with adjustable contact pressure at its periphery a braking surface (31) rigidly connected to the yarn contact roller and being arranged to roll on the braking surface upon delivery of the yarn, characterised in that the two rollers (10,11) are arranged upright with vertical shafts (24,36) above a carrier (12) of a spool frame, that the braking surface (31) for the pressure roller (11) is arranged on the roller shaft (24) of the cup-shaped yarn contact roller (10) between this roller and the carrier (12), that the yarn contact roller (10) is seated above the carrier (12) higher than the pressure roller (11) which is pressed below it against the braking surface (31), with the axes of the roller shafts spaced from each other by approximately the radius of the yarn contact roller (10), that the pressure roller (11) and a section (49) of the roller shaft (24) having the braking surface (31) are mounted enclosed in a housing (50) which is secured to the carrier (12), that the yarn contact roller (10) arranged with its yarn looping surface (20) above the housing (50) closes its entry hole into the housing (50) by an annular radial collar (23) arranged at the level of an outer wall (58) of the housing apart from a gap (57), and that the diameter of the roller shaft of the cup-shaped yarn contact roller (10) in the region of the braking surface (31) is smaller than the diameter of the pressure roller (11).
  2. Device according to claim 1, characterised in that the yarn looping surface (20) of the yarn contact roller (10) is tapered in cross-section.
  3. Device according to claim 2, characterised in that the yarn looping surface (20) has a first, more sharply inclined tapered ring (21), at the level of which is arranged a yarn inlet eye (54) and adjacent to which is a second, less sharply inclined tapered ring (20), at the level of which is positioned a yarn outlet eye (55).
  4. Device according to one of claims 1 to 3, characterised in that the roller shaft (24) of the yarn contact roller (10) is hollow and has two roller bearings (27) which are clamped in position spaced from each other and by means of which the yarn contact roller (10) is releasably fitted onto a stay bolt (28) of the carrier (12).
  5. Device according to one of claims 1 to 4, characterised in that the roller shaft (24) is an element secured releasably to the yarn contact roller (10) and having an annular radial projection (30) which defines the braking surface (31) and/or that the braking surface (31) is formed as a tapered surface narrowing as necessary towards the yarn contact roller (10).
  6. Device according to one of claims 1 to 5, characterised in that the yarn contact roller (10) is of light metal and is of approximately constant thickness in the region of the yarn looping surface (20).
  7. Device according to one of claims 1 to 6, characterised in that the pressure roller (11) is narrower than the yarn looping surface (20) of the yarn contact roller (10).
  8. Device according to one of claims 1 to 7, characterised in that the pressure roller (11) is subjected to the action of a tension spring (14) which is secured at one end (14') to a setting ring (44) which is positioned adjustably on a setting rod (13), and has its other end (14'') in engagement with a tension ring (46) which is supported on a radial shoulder (48) of a setting rod bore (49) of a pivotably movable roller shaft carrier (15) of the pressure roller (11).
  9. Device according to claim 8, characterised in that the pressure roller (11) is secured to the roller shaft carrier (15) by a screw fastening.
EP88100603A 1987-02-24 1988-01-18 Yarn-tensioning device Expired - Lifetime EP0280025B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3705836 1987-02-24
DE19873705836 DE3705836A1 (en) 1987-02-24 1987-02-24 THREAD BRAKE DEVICE

Publications (3)

Publication Number Publication Date
EP0280025A2 EP0280025A2 (en) 1988-08-31
EP0280025A3 EP0280025A3 (en) 1988-11-09
EP0280025B1 true EP0280025B1 (en) 1991-12-27

Family

ID=6321623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100603A Expired - Lifetime EP0280025B1 (en) 1987-02-24 1988-01-18 Yarn-tensioning device

Country Status (3)

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EP (1) EP0280025B1 (en)
DE (2) DE3705836A1 (en)
ES (1) ES2027707T3 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE582636C (en) * 1930-11-13 1933-08-18 Schlafhorst & Co W Thread tensioner for creel
US2738937A (en) * 1951-10-06 1956-03-20 Celanese Corp Textile apparatus
US2686018A (en) * 1953-02-13 1954-08-10 Int Harvester Co Internal friction device
CH399858A (en) * 1961-10-27 1965-09-30 Micafil Ag Device for keeping the wire tension constant on overhead wire haulers
DE2349334C2 (en) * 1973-10-01 1983-12-22 Hacoba Textilmaschinen Gmbh & Co Kg, 5600 Wuppertal Braking device for textile thread-like goods
IT1023949B (en) * 1974-12-06 1978-05-30 Textilmaschinen Gmbh Und Co Kg FREN DEVICE FOR WEAVING AND SPINNING APPARATUS
CH660720A5 (en) * 1983-09-14 1987-06-15 Benninger Ag Maschf THREAD BRAKE DEVICE.

Also Published As

Publication number Publication date
EP0280025A2 (en) 1988-08-31
DE3705836A1 (en) 1988-09-01
DE3867082D1 (en) 1992-02-06
ES2027707T3 (en) 1992-06-16
EP0280025A3 (en) 1988-11-09

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