EP0973686B1 - Yarn tensioning device - Google Patents

Yarn tensioning device Download PDF

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Publication number
EP0973686B1
EP0973686B1 EP98928191A EP98928191A EP0973686B1 EP 0973686 B1 EP0973686 B1 EP 0973686B1 EP 98928191 A EP98928191 A EP 98928191A EP 98928191 A EP98928191 A EP 98928191A EP 0973686 B1 EP0973686 B1 EP 0973686B1
Authority
EP
European Patent Office
Prior art keywords
yarn
brake
braking element
thread
stationary
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
EP98928191A
Other languages
German (de)
French (fr)
Other versions
EP0973686A1 (en
Inventor
Henry Shaw
Dirk Willemot
Ignace De Ro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Picanol NV
Original Assignee
Picanol NV
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Filing date
Publication date
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Publication of EP0973686A1 publication Critical patent/EP0973686A1/en
Application granted granted Critical
Publication of EP0973686B1 publication Critical patent/EP0973686B1/en
Anticipated expiration legal-status Critical
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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
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/22—Co-operating surfaces mounted for relative movement and arranged to apply pressure to 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
    • B65H2555/00—Actuating means
    • B65H2555/10—Actuating means linear
    • B65H2555/13—Actuating means linear magnetic, e.g. induction motors
    • 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 brake with a movable, plate-shaped braking element that by means of loading means is pressed against a stationary braking element in order to to brake a thread running between the braking elements.
  • Thread brakes of the type mentioned are from FR-A 1 161 662, IT 593 034 and FR-A 2 300 734. at these types, the movable braking element is by means of its Dead weight, by means of magnetic means adjustable force and / or by means of compressed air adjustable force against a stationary one Brake element pressed.
  • Such thread brakes have the disadvantage that that they cause damage and / or breakage of threads can lead, especially if the threads pimples or thick spots and / or have other irregularities.
  • a thread brake is known, which with two pairs of movable, plate-shaped brake elements is provided. These brake elements are each on two pins plugged in without jamming, for which purpose they have correspondingly large Recesses are provided. Between the two pairs of Brake elements, an electromagnet is arranged, the armature is provided with a bridge, each on the outer Brake elements abut and these against the respective inner Brake elements presses on.
  • the two plate-shaped braking elements has between which the thread to be braked runs.
  • This Thread brake contains an electromagnet that forms two poles. At the two poles there is a first plate-shaped one Brake element, which consists of non-magnetizable material.
  • the second, outer brake element consists of magnetizable Material and can be attached to the Brake element made of non-magnetizable material be used.
  • the two plate-shaped brake elements are aligned essentially vertically and on two bolts attached. The path of movement of the thread to be braked runs horizontally essentially in the middle of both Brake elements.
  • a thread brake is known from CH-A 68 21 48 by means of of the two threads running in parallel on two successive threads Places can be braked. Every braking point has three plate-shaped brake elements, i.e. a medium one Brake element and two outer brake elements.
  • the strings run on both sides of the central braking element, so that they each between the middle and an outer brake element can be braked.
  • the three braking elements are with one edge parallel to the path of movement of the thread in held a hook-shaped guide.
  • One of the two outer ones Brake elements are each on a wall of a bracket on.
  • the opposite outer braking element is by means of adjustable spring load and towards that middle and the other outer brake element can be pressed.
  • the path of movement of the threads lies between that in the hook guide elements led edge of the braking elements and the Attack point for the load.
  • the invention has for its object a thread brake of the type mentioned in such a way that the risk of Damage and / or breakage of threads is reduced, even if these threads are pimples, thick spots, thin spots or have other irregularities.
  • This object is achieved in that the thread along a Trajectory between the braking elements is guided, that the plate-shaped braking element transverse to the path of movement of the thread protrudes beyond the stationary braking element and at a distance tiltable to the path of movement of the thread by means of a Tilt axis is supported, which is substantially parallel to Path of movement of the thread is aligned.
  • the movable Braking element in a simple manner around the predetermined tilt axis tilt when pimples or other irregularities of a thread run between the brake elements, so that these largely without a sudden increase in braking force or without significant impediment can run through the thread brake.
  • the plate-shaped braking element by means of two Pins is held, which is essentially perpendicular to the stationary braking element and in the direction of movement of the braking thread are spaced from each other which the first pin in the direction of movement of the thread the side facing the path of movement of the thread and the second pin on the path facing away from the thread Side of the tilt axis are arranged, and that the plate-shaped Brake element with recesses surrounding the pins with play is provided.
  • the Tilt axis of the plate-shaped braking element through the points of contact determined on the recesses of the plate-shaped Brake element touch the pins.
  • This embodiment offers advantages in terms of tilting the movable Braking element.
  • the tilt axis fixed, with the torque being absorbed with which the running thread acts on the movable brake element.
  • the Tilt axis with a substantially parallel to the direction of movement of the thread running edge of a the stationary Braking element enclosing web of a holding part coincides. In both cases it is ensured that the area between the pins on the plate-shaped braking element a defined tilt axis.
  • the edge that is outside the area of the pins the tilt axis defined can run in a straight line.
  • the edge of the stationary Brake element or the edge of the stationary brake element bordering web essentially perpendicular to the braking surface the braking elements are convexly curved. That simplifies the tilting movement of the movable brake element.
  • the braking elements essentially vertical and the tilt axis essentially aligned horizontally.
  • This arrangement is advantageous in terms of the tilting movement of the movable brake element there whose own weight has little influence on the tilting movement and thus a relatively heavy movable brake element is used can be. This is particularly beneficial if the load means contain an electromagnet.
  • a spring with preferably adjustable loading force and serve a switchable electromagnet as a load for the plate-shaped made of magnetizable material Brake element a spring with preferably adjustable loading force and serve a switchable electromagnet.
  • the electromagnet has two poles on the side of the stationary Brake element arranged on both sides of the path of movement of the thread are. It is useful if one of the poles of the Electromagnets arranged approximately in the region of the tilt axis is. This has the advantage that the movable brake element even with a load by means of the electromagnet can tilt the tilt axis.
  • the stationary braking element and / or the movable Brake element in an inlet area for the one to be braked Thread are provided with a chamfer. This is from Advantage for the thread passing through the thread brake.
  • the tilt axis - seen in plan view - in one Direction of movement of the thread tapering angle to the path of movement the thread is aligned.
  • One in the thread brake Incoming thickening can then the movable braking element tilt relatively easily.
  • the rapier weaving machine shown in Fig. 1 has one Encoder gripper 1 and a slave gripper 2, by means of which Weft threads 3, 4, 5 are introduced into a shed 6.
  • the Shed is formed from warp threads 7, which are not shown Specialist educational resources are raised and lowered.
  • the weft threads are by means of needles 9, 10, 11 of a thread feed device 8 delivered to the encoder gripper 1, from which Pick-up gripper 1 picked up by means of a weft scissors 12 in the area of a guide located on the entry page 13 14 cut off in the area of the selvedge 15 and then by means of the donor gripper 1 brought to about the middle of the shed 6.
  • the slave gripper 2 moves from the opposite one Page 16 forth essentially in sync with the encoder gripper 1 into and out of the shed 6.
  • the respective one is essentially in the middle of the shed 6
  • Weft thread from the slave gripper 2 from the master gripper 1 removed and from the slave gripper 2 to the opposite Page 16 of the shed 6 transported.
  • Then the Weft thread released on this side by the slave gripper and then from the reed 17 on the edge of the fabric 18 struck, after which they are bound by the warp threads 7 become.
  • the encoder gripper 1 and the slave gripper 2 are each arranged on driven gripper belts 19, 20, with which they in and out of the shed 6 be moved out again.
  • the weft threads 3, 4, 5 run from bobbins 21 via pre-unwinder 22, thread brakes 23, thread monitor 24 and the needles 9, 10, 11 to the entry page 13.
  • a control device 25 controls the pre-unwinder 22, the thread brakes 23 and the needles 9, 10, 11 of the thread feeding device. She also receives 24 thread break signals from the thread monitors.
  • the thread brakes 23, the thread feed device 8, the control unit 25, the Thread monitor 24 and the bobbins 21 are attached to a frame 26.
  • the prewinding devices 22 are also on this frame attached by means of brackets, not shown.
  • a shaft 27 is shown, which is synchronous with the main drive shaft of the rapier weaving machine rotates.
  • an encoder disk 28 is provided, which has a sensor 29 cooperates, which is connected to the control unit 25 is.
  • the sensor 29 sends signals to the control unit a, which represent the angular position of the shaft 27.
  • An input device is also connected to the control unit 25 30 connected, with the data for controlling the thread brakes 23 can be entered depending on the thread brakes from the angular position of the shaft 27 and thus synchronously for the operation of the rapier weaving machine and / or depending of the course of movement of the entered in a shed 6 To control the weft.
  • Such a control is known for example from US 5 002 098, so that it is not further explained here.
  • a thread brake 23 contains two braking elements 31, 32, between which one Weft 3 can be braked.
  • a braking element 31 is arranged stationary, while the other brake element 32 is movable is.
  • the braking elements 31, 32 are at least in the Area in which they are in contact with the weft 3 come from wear-resistant material or with a wear-resistant Provide coating.
  • the thread brake 23 contains further load means to the brake elements 31, 32 to each other to press. This burden consists of one Electromagnet 33 and a spring 34, both of which are movable Brake element 32 towards the stationary Load brake element 31.
  • the braking elements 31, 32 are at the illustrated embodiment is substantially vertical aligned.
  • the stationary brake element 31 is a thin, flexible disc, which, for example, consists of a magnet that cannot be magnetized or is only slightly magnetizable Steel is made and fixed to a bracket 35 is attached.
  • the holder consists of non-magnetizable Material, for example from an aluminum casting.
  • the stationary brake element 31 is in the area of it both ends with openings 36 so that it with the help can be attached by screws 37 to the bracket 35.
  • a clamping element 38 is provided to the stationary braking element snugly against a counter surface of the To apply bracket 35.
  • the tensioning element 38 presses by means of a rod 39, in particular of a rubber rod, the lamellar braking element 31 into a notch 40 of the holder 35.
  • a rod 39 in particular of a rubber rod
  • the movable brake element 32 is designed as a plate, their thickness on the order of 1 mm or less lies.
  • the braking element 32 has two cutouts 41, 42 provided, in the direction of movement A of the weft thread to be braked 3 are arranged at a distance from each other. These openings 41, 42 are also at different distances to the trajectory of the weft thread to be braked 3. The The reason for this will be explained later.
  • the bracket 35 is provided with two pins 43, 44. Pins 43, 44, consist of ceramic, for example, are on the holder 35 firmly attached, for example in holes in the holder 35 glued.
  • the pins 43, 44 are substantially perpendicular to the braking elements 31, 32 are aligned by the openings 41 having a rectangular cross section, 42 surrounded with a relatively large game.
  • the pins 43, 44 are also at different distances from the trajectory arranged to be braked weft 3.
  • the recess 41 has an edge 45 which abuts the pin 43 at a point of contact 47.
  • the recess 42 also has an edge 46 which is at a point of contact 48 abuts the pin 44.
  • the points of contact 47, 48 determine a tilt axis 49 around which the plate-shaped Brake element 32 can be tilted.
  • the edges 45, 46 are essentially flush with one another, so that they essentially coincide with the tilt axis 49.
  • the through the points of contact 47, 48 of the plate-shaped Brake element 32 with the pins 43, 44 formed tilt axis 49 is at a distance from the trajectory of the braking weft.
  • the tilt axis 49 runs almost parallel to its direction of movement A.
  • the tilt axis 49 accordingly 4 essentially parallel to the path of movement of the weft thread 3 and in plan view 5 at a relatively small angle B to that Weft 3 runs.
  • This relatively small angle B has the Advantage that the weft 3 the plate-shaped braking element 32 can tilt about its tilt axis.
  • the path of movement of the weft thread 3 is shown in the Embodiment determined by two thread guides 50, 51, the on the bracket in a manner not shown 35 are attached, for example with screws.
  • the Bracket 35 is further provided with an opening 52 by means of which they with, for example, a rod-shaped holder can be attached to the frame 26.
  • the spring 34 which is wound as a truncated cone Coil spring is formed, is based on the one hand the plate-shaped brake element 32 and on the other hand on one Adjusting nut 53.
  • the adjusting nut 53 is on a threaded spindle 54 screwed on, which is essentially U-shaped has a curved shape and attached to the bracket 35 is. For example, it can be in a bore 55 of the Bracket 35 can be glued.
  • By adjusting the adjusting nut 53 can the bias of the spring 34 and thus their Load force can be selected.
  • the plate-shaped braking element protrudes 32 the stationary braking element 31 on the side of the Tilt axis 49.
  • the spring 34 is arranged and aligned that their axis and thus the focus of their resilience is directed to an area between the Path of movement of the weft thread 3 and the tilt axis 49 lies.
  • the electromagnet contains 33 two curved iron bars 56, 57, the outside of which the holder 35 ends by means of an iron rod 58 are connected. There is a winding on this iron rod 58 59 provided. The other ends of the iron bars 56, 57 end as poles 60, 61 on the stationary braking element 31. These poles 60, 61 are arranged so that the trajectory of the weft thread 3 to be braked between the two poles 60, 61 lies. As can be seen from Figs. 3 and 6, the bracket 35 provided with a cavity 62 in which the iron bars 56 and 57 and the poles 60, 61 lie.
  • This cavity is 62 filled with an insulating plastic, so that both the iron bars 56, 57 as well as the iron bar 58 and the winding 59 are kept vibration-free.
  • the winding 59 can by the control unit 25 at certain times with a defined Power is supplied so that the required magnetic Force is generated to the plate-shaped braking element 32 to pull the poles 60, 61.
  • the electromagnet 33 is only one embodiment. each The type of coil and / or core can be used as an electromagnet which generates a magnetic field in the region of poles 60, 61, around the plate-shaped brake element 32 to the brake element 31 to be used.
  • the stationary braking element 31 has an approximately U-shaped shape. Being (in the Installation position) upper edge 63 is in the area of the pin 43 provided with a recess 64 so that the edge 63 tangential runs to the top of the pin 43, i.e. to that Point of contact 47 with the edge 45 of the recess 41 of the plate-shaped brake element 32.
  • the fixed brake element 31 is also arranged so that its edge 63 tangential runs to the bottom of the pin 44, i.e. to the point of contact 48 between the edge 46 of the recess 42 of the plate-shaped brake element 32.
  • the between the pins 43 and 44 located section 65 of the edge 63 thus falls in essentially together with the tilt axis 49.
  • Section 65 thus supports the plate-shaped brake element 32 when this tilts about its tilt axis 49, as in particular 6 and 7 can be seen.
  • the pole 60 of the electromagnet 33 is nearby of section 65 arranged and thus in the vicinity of Tilt axis 49.
  • the area of the plate-shaped braking element 32 which is the stationary braking element 31 opposite, in the section essentially just that attracted to the poles 60, 61 of the electromagnet and acts on the spring 34.
  • the entry area for the weft 3, i.e. the thread guide 50 facing The area of the plate-shaped brake element 32 is from that stationary braking element 31 curved away, so that an inlet slope is created for the weft 3.
  • the movable brake element 32 When weaving, the movable brake element 32 is by means of the Spring 34 loaded to the stationary brake element 31, so that the weft 3 between the brake elements 31 and 32nd is braked.
  • the spring 34 is relatively weak, so that braking force applied by the spring 34 is relatively low is. This braking force can be achieved by turning the adjusting nut 53 can be set on the threaded spindle 54. If during a higher braking force is required for a shot entry, so the electromagnet 33 is driven so that the movable Brake element 32 is attracted to the poles 60 and 61. The weft 3 is then between the stationary braking element 31 and the movable brake element 32 clamped more. Since the stationary braking element 31 is not or little there is magnetizable material, the movable brake element 32 with a relatively large force from the electromagnet 33 to be tightened.
  • the weft thread 3 as shown, for example, in FIG. 6 is shown between the stationary brake element 31 and the movable brake element 32, takes the movable Brake element 32 a position in which it is on the section 65 of the edge 63 of the stationary brake element 31 is supported. This tipping is possible because above the stationary brake element 31 in the holder 35, a free space 66 is left.
  • the plate-shaped brake element 32 is thus about the tilt axis 49 and / or the section 65 of the edge 63 of the stationary brake element 31 slightly tilted. If - As shown in Fig.
  • the openings 41, 42 can be compared to the pins 43, 44 can therefore be relatively large without moving Brake element 32 around a horizontal during operation Axis rotates.
  • the tilt axis 49 thus remains during weaving through the connecting line between the contact point 47 of the pin 43 with the edge 45 of the recess 41 and the point of contact 48 of the pin 44 with the edge 46 of the recess 42 determined.
  • the holder 35 provided with a web 68 which the upper edge of the stationary Braking element 31 borders.
  • This web 68 runs in such a way as in the previously described embodiment with respect to section 65 of the upper edge 63 of the stationary Brake element 31 has been described.
  • the web 68 forms thus an upper edge 69 which is essentially with the tilt axis 49 coincides, so that the movable brake element 32nd is supported on this edge 69.
  • the use of a web may have the advantage that the stationary braking element 31 not necessarily be positioned exactly got to.
  • the stationary Brake element 31 facing surface of the movable brake element 32 slightly convex. At least it is on the the thread side 50 facing the inlet side, i.e. where the too braking weft first in contact with the braking element 32 comes curved away from the stationary brake element 31.
  • the surface facing the movable brake element 32 the stationary brake element 31 is also slightly convex curved.
  • the upper edge 70 of the stationary brake element 31 is thus also in the area between the pins 43, 44 slightly convex. This is when tilting the moveable Brake element 32 is advantageous because the brake element 32 only abuts the edge 70 over a short distance, so that the Tilting the braking element 32 against a relatively low resistance can be done.
  • the tilt axis 49 is also in this Embodiment of the pins 43, 44 set so that they essentially parallel to the weft thread 3 to be braked runs. 9 forms the tilt axis 49 a relatively small angle C with that to be braked Weft thread 3, so that the total tilt axis 49 essentially runs parallel to the weft thread 3 to be braked and the braking element 32 can therefore be tilted in a simple manner can.
  • the path of movement of the weft thread 3 to be braked does not have to be determined by the two thread guides 50, 51, the the holder 35 of the thread brake 23 are attached.
  • the Function of the first thread guide 50 can be performed by a thread guide at the output of the pre-winder 22 and the function of second thread guide 51 can be a thread guide of the thread monitor 24 are taken over. In this case, the distance between the pre-winding device 22 and the thread brake 23 and the distance between the thread brake 23 and the thread monitor 24 be relatively small.
  • thread guides 50, 51 in the form of bars or rods can also other embodiments of thread guides are provided, for example thread guides in the form of thread eyes.
  • the thread brake 23 is only for the weft thread in the above 3 has been described. Of course, the thread brakes 23 for the weft threads 4 and 5 executed in the same way his.
  • Thread brake for braking weft threads 3, 4, 5 of a rapier weaving machine can of course also be used to brake Weft threads are used in other types of weaving machines, for example air jet looms, water jet looms, Projectile looms or any other type of loom.
  • the thread brake 23 can also Braking a thread in other types of textile machines are used, for example in winding machines, building machines, Knitting machines or other types of machines where a thread must be braked.

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  • Looms (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention relates to a yarn tensioning device (23) comprising two tensioning elements (31, 32) between which a yarn (3) can be tensioned. A tensioning element is movably arranged in said tensioning device (23). Means (33, 34) are also provided so that the tensioning elements (31, 32) can be pressed against each other. The moveable tensioning element (32) is shaped like a plate which can tilt around a tilting axis located at a distance from and substantially parallel to the travel path of the yarn (3) which is to be tensioned

Description

Die Erfindung betrifft eine Fadenbremse mit einem beweglichen, plattenförmigen Bremselement, das mittels Belastungsmitteln an ein stationäres Bremselement andrückbar ist, um einen zwischen den Bremselementen laufenden Faden zu bremsen.The invention relates to a thread brake with a movable, plate-shaped braking element that by means of loading means is pressed against a stationary braking element in order to to brake a thread running between the braking elements.

Fadenbremsen der eingangs genannten Art sind aus der FR-A 1 161 662, der IT 593 034 und der FR-A 2 300 734 bekannt. Bei diesen Bauarten wird das bewegliche Bremselement mittels seines Eigengewichtes, mittels einer durch magnetische Mittel einstellbaren Kraft und/oder mittels einer durch Druckluftmittel einstellbaren Kraft gegen ein stationär angeordnetes Bremselement gedrückt. Derartige Fadenbremsen haben den Nachteil, daß sie zu Beschädigungen und/oder Brüchen von Fäden führen können, insbesondere, wenn die Fäden Noppen oder Dickstellen und/oder andere Unregelmäßigkeiten aufweisen.Thread brakes of the type mentioned are from FR-A 1 161 662, IT 593 034 and FR-A 2 300 734. at these types, the movable braking element is by means of its Dead weight, by means of magnetic means adjustable force and / or by means of compressed air adjustable force against a stationary one Brake element pressed. Such thread brakes have the disadvantage that that they cause damage and / or breakage of threads can lead, especially if the threads pimples or thick spots and / or have other irregularities.

Aus der DE 21 30 670 ist eine Fadenbremse bekannt, die mit zwei Paaren von beweglichen, plattenförmigen Bremselementen versehen ist. Diese Bremselemente sind jeweils auf zwei Stifte klemmfrei aufgesteckt, wozu sie mit entsprechend großen Aussparungen versehen sind. Zwischen den beiden Paaren von Bremselementen ist ein Elektromagnet angeordnet, dessen Anker mit einer Brücke versehen ist, die jeweils an den äußeren Bremselementen anliegt und diese gegen die jeweils inneren Bremselemente andrückt.From DE 21 30 670 a thread brake is known, which with two pairs of movable, plate-shaped brake elements is provided. These brake elements are each on two pins plugged in without jamming, for which purpose they have correspondingly large Recesses are provided. Between the two pairs of Brake elements, an electromagnet is arranged, the armature is provided with a bridge, each on the outer Brake elements abut and these against the respective inner Brake elements presses on.

Es ist weiter ein Fadenspanner oder eine Fadenbremse aus der GB-A 20 93 488 bekannt, der zwei plattenförmige Bremselemente aufweist, zwischen denen der zu bremsende Faden läuft. Diese Fadenbremse enthält einen Elektromagneten, der zwei Pole bildet. An den beiden Polen liegt ein erstes plattenförmiges Bremselement an, das aus nicht magnetisierbarem Material besteht. Das zweite, äußere Bremselement besteht aus magnetisierbarem Material und kann mittels der Magnetkraft an das aus nicht magnetisierbarem Material bestehende Bremselement herangezogen werden. Die beiden plattenförmigen Bremselemente sind im wesentlichen vertikal ausgerichtet und auf zwei Bolzen aufgesteckt. Die Bewegungsbahn des zu bremsenden Fadens verläuft horizontal im wesentlichen in der Mitte von beiden Bremselementen.It is also a thread tensioner or a thread brake from the GB-A 20 93 488 known, the two plate-shaped braking elements has between which the thread to be braked runs. This Thread brake contains an electromagnet that forms two poles. At the two poles there is a first plate-shaped one Brake element, which consists of non-magnetizable material. The second, outer brake element consists of magnetizable Material and can be attached to the Brake element made of non-magnetizable material be used. The two plate-shaped brake elements are aligned essentially vertically and on two bolts attached. The path of movement of the thread to be braked runs horizontally essentially in the middle of both Brake elements.

Aus der CH-A 68 21 48 ist eine Fadenbremse bekannt, mittels der zwei parallel laufende Fäden jeweils an zwei aufeinanderfolgenden Stellen gebremst werden können. Jede Bremsstelle weist drei plattenförmige Bremselemente auf, d.h. ein mittleres Bremselement und zwei äußere Bremselemente. Die Fäden laufen beidseits des mittleren Bremselementes, so daß sie jeweils zwischen dem mittleren und einem äußeren Bremselement gebremst werden können. Die drei Bremselemente sind mit einem parallel zur Bewegungsbahn des Fadens verlaufenden Rand in einer hakenförmigen Führung gehalten. Eines der beiden äußeren Bremselemente liegt jeweils an einer Wand einer Halterung an. Das gegenüberliegende äußere Bremselement ist mittels einstellbarer Federkraft belastet und in Richtung zu dem mittleren und dem anderen äußeren Bremselement andrückbar. Die Bewegungsbahn der Fäden liegt zwischen dem in den Hakenführungselementen geführten Rand der Bremselemente und der Angriffsstelle für die Belastungskraft. A thread brake is known from CH-A 68 21 48 by means of of the two threads running in parallel on two successive threads Places can be braked. Every braking point has three plate-shaped brake elements, i.e. a medium one Brake element and two outer brake elements. The strings run on both sides of the central braking element, so that they each between the middle and an outer brake element can be braked. The three braking elements are with one edge parallel to the path of movement of the thread in held a hook-shaped guide. One of the two outer ones Brake elements are each on a wall of a bracket on. The opposite outer braking element is by means of adjustable spring load and towards that middle and the other outer brake element can be pressed. The path of movement of the threads lies between that in the hook guide elements led edge of the braking elements and the Attack point for the load.

Der Erfindung liegt die Aufgabe zugrunde, eine Fadenbremse der eingangs genannten Art so auszubilden, daß die Gefahr von Beschädigungen und/oder Brüchen von Fäden verringert ist, auch wenn diese Fäden Noppen, Dickstellen, Dünnstellen oder andere Unregelmäßigkeiten aufweisen.The invention has for its object a thread brake of the type mentioned in such a way that the risk of Damage and / or breakage of threads is reduced, even if these threads are pimples, thick spots, thin spots or have other irregularities.

Diese Aufgabe wird dadurch gelöst, daß der Faden entlang einer Bewegungsbahn zwischen den Bremselementen geführt ist, daß das plattenförmige Bremselement quer zur Bewegungsbahn des Fadens das stationäre Bremselement überragt und in Abstand zu der Bewegungsbahn des Fadens kippbar mittels einer Kippachse abgestützt ist, die im wesentlichen parallel zur Bewegungsbahn des Fadens ausgerichtet ist.This object is achieved in that the thread along a Trajectory between the braking elements is guided, that the plate-shaped braking element transverse to the path of movement of the thread protrudes beyond the stationary braking element and at a distance tiltable to the path of movement of the thread by means of a Tilt axis is supported, which is substantially parallel to Path of movement of the thread is aligned.

Bei der erfindungsgemäßen Fadenbremse kann das bewegliche Bremselement in einfacher Weise um die vorgegebene Kippachse kippen, wenn Noppen oder andere Unregelmäßigkeiten eines Fadens zwischen die Bremselemente einlaufen, so daß diese weitgehend ohne sprunghaftes Ansteigen der Bremskraft oder ohne wesentliche Behinderung durch die Fadenbremse laufen können.In the thread brake according to the invention, the movable Braking element in a simple manner around the predetermined tilt axis tilt when pimples or other irregularities of a thread run between the brake elements, so that these largely without a sudden increase in braking force or without significant impediment can run through the thread brake.

Bei einer vorteilhaften Ausführungsform der Erfindung ist vorgesehen, daß das plattenförmige Bremselement mittels zwei Stiften gehalten ist, die im wesentlichen lotrecht zu dem stationären Bremselement und in Bewegungsrichtung des zu bremsenden Fadens in Abstand zueinander angeordnet sind, von welchen der in Bewegungsrichtung des Fadens erste Stift auf der der Bewegungsbahn des Fadens zugewandten Seite und der zweite Stift auf der der Bewegungsbahn des Fadens abgewandten Seite der Kippachse angeordnet sind, und daß das plattenförmige Bremselement mit die Stifte mit Spiel umgebenden Aussparungen versehen ist. Bei dieser Ausführungsform wird die Kippachse des plattenförmigen Bremselementes durch die Berührungspunkte bestimmt, an der die Aussparungen des plattenförmigen Bremselementes die Stifte berühren. Diese Ausführungsform bietet Vorteile bezüglich des Kippens des beweglichen Bremselementes. Bei dieser Ausführungsform ist die Kippachse festgelegt, wobei auch das Drehmoment aufgefangen wird, mit welchem der laufende Faden das bewegliche Bremselement beaufschlagt.In an advantageous embodiment of the invention provided that the plate-shaped braking element by means of two Pins is held, which is essentially perpendicular to the stationary braking element and in the direction of movement of the braking thread are spaced from each other which the first pin in the direction of movement of the thread the side facing the path of movement of the thread and the second pin on the path facing away from the thread Side of the tilt axis are arranged, and that the plate-shaped Brake element with recesses surrounding the pins with play is provided. In this embodiment, the Tilt axis of the plate-shaped braking element through the points of contact determined on the recesses of the plate-shaped Brake element touch the pins. This embodiment offers advantages in terms of tilting the movable Braking element. In this embodiment, the tilt axis fixed, with the torque being absorbed with which the running thread acts on the movable brake element.

Bei der ersten Ausführungsform der Erfindung wird vorgesehen, daß die Kippachse mit einem im wesentlichen parallel zur Bewegungsrichtung des Fadens verlaufenden Rand des stationären Bremselementes zusammenfällt.In the first embodiment of the invention, that the tilt axis with a substantially parallel to the direction of movement of the thread running edge of the stationary Brake element coincides.

Bei einer anderen Ausführungsform wird vorgesehen, daß die Kippachse mit einem im wesentlichen parallel zur Bewegungsrichtung des Fadens verlaufenden Rand eines das stationäre Bremselement einfassenden Steges eines Halteteils zusammenfällt. In beiden Fällen wird sichergestellt, daß auch im Bereich zwischen den Stiften das plattenförmige Bremselement an einer definierten Kippachse anliegt.In another embodiment it is provided that the Tilt axis with a substantially parallel to the direction of movement of the thread running edge of a the stationary Braking element enclosing web of a holding part coincides. In both cases it is ensured that the area between the pins on the plate-shaped braking element a defined tilt axis.

Der Rand, der außerhalb des Bereiches der Stifte die Kippachse definiert kann geradlinig verlaufen. Bei einer vorteilhaften Ausgestaltung wird vorgesehen, daß der Rand des stationären Bremselementes oder der Rand des das stationäre Bremselement einfassenden Steges im wesentlichen lotrecht zur Bremsfläche der Bremselemente konvex gekrümmt ist. Das vereinfacht die Kippbewegung des beweglichen Bremselementes.The edge that is outside the area of the pins the tilt axis defined can run in a straight line. With an advantageous Design is provided that the edge of the stationary Brake element or the edge of the stationary brake element bordering web essentially perpendicular to the braking surface the braking elements are convexly curved. That simplifies the tilting movement of the movable brake element.

Bei einer bevorzugten Ausführungsform sind die Bremselemente im wesentlichen vertikal und die Kippachse im wesentlichen horizontal ausgerichtet. Diese Anordnung ist von Vorteil bezüglich der Kippbewegung des beweglichen Bremselementes, da dessen Eigengewicht wenig Einfluß auf die Kippbewegung hat und somit ein relativ schweres bewegliches Bremselement eingesetzt werden kann. Dies ist insbesondere von Vorteil, wenn die Belastungsmittel einen Elektromagneten enthalten.In a preferred embodiment, the braking elements essentially vertical and the tilt axis essentially aligned horizontally. This arrangement is advantageous in terms of the tilting movement of the movable brake element there whose own weight has little influence on the tilting movement and thus a relatively heavy movable brake element is used can be. This is particularly beneficial if the load means contain an electromagnet.

Bevorzugt wird vorgesehen, daß als Belastungsmittel für das aus magnetisierbarem Material bestehende plattenförmige Bremselement eine Feder mit vorzugsweise einstellbarer Belastungskraft und ein schaltbarer Elektromagnet dienen. In bevorzugter Weiterbildung wird vorgesehen, daß der Elektromagnet zwei Pole aufweist, die auf der Seite des stationären Bremselementes beidseits der Bewegungsbahn des Fadens angeordnet sind. Dabei ist es zweckmäßig, wenn einer der Pole des Elektromagneten annähernd im Bereich der Kippachse angeordnet ist. Dies hat den Vorteil, daß das bewegliche Bremselement auch bei einer Belastung mittels des Elektromagneten noch um die Kippachse kippen kann.It is preferably provided that as a load for the plate-shaped made of magnetizable material Brake element a spring with preferably adjustable loading force and serve a switchable electromagnet. In preferred Training is provided that the electromagnet has two poles on the side of the stationary Brake element arranged on both sides of the path of movement of the thread are. It is useful if one of the poles of the Electromagnets arranged approximately in the region of the tilt axis is. This has the advantage that the movable brake element even with a load by means of the electromagnet can tilt the tilt axis.

Bei einer bevorzugten Ausführungsform wird weiter vorgesehen, daß das stationäre Bremselement und/oder das bewegliche Bremselement in einem Einlaufbereich für den zu bremsenden Faden mit einer Einlaufschrägen versehen sind. Dies ist von Vorteil für das Durchlaufen des Fadens durch die Fadenbremse.In a preferred embodiment, it is further provided that that the stationary braking element and / or the movable Brake element in an inlet area for the one to be braked Thread are provided with a chamfer. This is from Advantage for the thread passing through the thread brake.

In weiterer Ausgestaltung der Erfindung wird vorgesehen, daß die Kippachse - in der Draufsicht gesehen - in einem sich in Bewegungsrichtung des Fadens verjüngenden Winkel zur Bewegungsbahn des Fadens ausgerichtet ist. Eine in die Fadenbremse einlaufende Verdickung kann dann das bewegliche Bremselement relativ leicht kippen.In a further embodiment of the invention it is provided that the tilt axis - seen in plan view - in one Direction of movement of the thread tapering angle to the path of movement the thread is aligned. One in the thread brake Incoming thickening can then the movable braking element tilt relatively easily.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der in den Zeichnungen dargestellten Ausführungsbeispiele.

Fig. 1
zeigt in schematischer Darstellung eine Greiferwebmaschine mit mehreren erfindungsgemäßen Fadenbremsen,
Fig. 2
eine perspektivische Ansicht in größerem Maßstab einer erfindungsgemäßen Fadenbremse,
Fig. 3
eine Explosionszeichnung der Fadenbremse nach Fig. 2 (ohne eine federnde Belastungseinrichtung),
Fig. 4
eine Frontansicht der erfindungsgemäßen Fadenbremse nach Fig. 2 und 3 (ohne federnde Belastungseinrichtung),
Fig. 5
eine Draufsicht auf die Fadenbremse nach Fig. 2 bis 4,
Fig. 6
eine teilweise geschnitte Darstellung der Fadenbremse nach Fig. 2 bis 5,
Fig. 7
einen Teilschnitt entsprechend Fig. 6 in größerem Maßstab während des Durchlaufens einer Dickstelle,
Fig. 8
einen Teilschnitt entsprechend Fig. 7 auf eine abgewandelte Ausführungsform während des Durchlaufens des Fadens durch die Fadenbremse und
Fig. 9
eine Draufsicht ähnlich Fig. 5 auf eine abgewandelte Ausführungsform einer Fadenbremse.
Further features and advantages of the invention result from the following description of the exemplary embodiments shown in the drawings.
Fig. 1
shows a schematic representation of a rapier weaving machine with several thread brakes according to the invention,
Fig. 2
2 shows a perspective view on a larger scale of a thread brake according to the invention,
Fig. 3
an exploded view of the thread brake according to FIG. 2 (without a resilient loading device),
Fig. 4
2 shows a front view of the thread brake according to the invention according to FIGS. 2 and 3 (without resilient loading device),
Fig. 5
2 shows a plan view of the thread brake according to FIGS. 2 to 4,
Fig. 6
3 shows a partially sectioned illustration of the thread brake according to FIGS. 2 to 5,
Fig. 7
6 on a larger scale while passing through a thick spot,
Fig. 8
a partial section corresponding to FIG. 7 on a modified embodiment during the passage of the thread through the thread brake and
Fig. 9
a plan view similar to FIG. 5 on a modified embodiment of a thread brake.

Die in Fig. 1 dargestellte Greiferwebmaschine besitzt einen Gebergreifer 1 und einen Nehmergreifer 2, mittels denen Schußfäden 3, 4, 5 in ein Webfach 6 eingebracht werden. Das Webfach wird aus Kettfäden 7 gebildet, die mittels nicht dargestellten Fachbildungsmitteln angehoben und abgesenkt werden. Die Schußfäden werden mittels Nadeln 9, 10, 11 einer Fadenzuführeinrichtung 8 dem Gebergreifer 1 zugestellt, von dem Gebergreifer 1 aufgenommen, mittels einer Schußfadenschere 12 im Bereich einer an der Eintragsseite 13 befindlichen Führung 14 im Bereich der Webkante 15 abgeschnitten und dann mittels des Gebergreifers 1 bis etwa in die Mitte des Webfaches 6 gebracht. Der Nehmergreifer 2 bewegt sich von der gegenüberliegenden Seite 16 her im wesentlichen synchron zu dem Gebergreifer 1 in das Webfach 6 hinein und wieder aus ihm hinaus. Im wesentlichen in der Mitte des Webfaches 6 wird der jeweilige Schußfaden von dem Nehmergreifer 2 aus dem Gebergreifer 1 entnommen und von dem Nehmergreifer 2 zur gegenüberliegenden Seite 16 des Webfaches 6 transportiert. Danach wird der Schußfaden auf dieser Seite von dem Nehmergreifer freigegeben und anschließend von dem Webblatt 17 an dem Warenrand des Gewebes 18 angeschlagen, wonach sie von den Kettfäden 7 eingebunden werden. Der Gebergreifer 1 und der Nehmergreifer 2 sind jeweils auf angetriebenen Greiferbändern 19, 20 angeordnet, mittels denen sie in das Webfaches 6 hinein- und aus diesem wieder herausbewegt werden.The rapier weaving machine shown in Fig. 1 has one Encoder gripper 1 and a slave gripper 2, by means of which Weft threads 3, 4, 5 are introduced into a shed 6. The Shed is formed from warp threads 7, which are not shown Specialist educational resources are raised and lowered. The weft threads are by means of needles 9, 10, 11 of a thread feed device 8 delivered to the encoder gripper 1, from which Pick-up gripper 1 picked up by means of a weft scissors 12 in the area of a guide located on the entry page 13 14 cut off in the area of the selvedge 15 and then by means of the donor gripper 1 brought to about the middle of the shed 6. The slave gripper 2 moves from the opposite one Page 16 forth essentially in sync with the encoder gripper 1 into and out of the shed 6. The respective one is essentially in the middle of the shed 6 Weft thread from the slave gripper 2 from the master gripper 1 removed and from the slave gripper 2 to the opposite Page 16 of the shed 6 transported. Then the Weft thread released on this side by the slave gripper and then from the reed 17 on the edge of the fabric 18 struck, after which they are bound by the warp threads 7 become. The encoder gripper 1 and the slave gripper 2 are each arranged on driven gripper belts 19, 20, with which they in and out of the shed 6 be moved out again.

Die Schußfäden 3, 4, 5 laufen von Spulen 21 über Vorabwickler 22, Fadenbremsen 23, Fadenwächter 24 und die Nadeln 9, 10, 11 zu der Eintragsseite 13. Eine Steuereinrichtung 25 steuert die Vorabwickler 22, die Fadenbremsen 23 und die Nadeln 9, 10, 11 der Fadenzuführungseinrichtung. Außerdem empfängt sie von den Fadenwächtern 24 Fadenbruchsignale. Die Fadenbremsen 23, die Fadenzuführeinrichtung 8, die Steuereinheit 25, der Fadenwächter 24 und die Spulen 21 sind an einem Rahmen 26 angebracht. An diesem Rahmen sind auch die Vorspulgeräte 22 mittels nicht dargestellter Halterungen befestigt.The weft threads 3, 4, 5 run from bobbins 21 via pre-unwinder 22, thread brakes 23, thread monitor 24 and the needles 9, 10, 11 to the entry page 13. A control device 25 controls the pre-unwinder 22, the thread brakes 23 and the needles 9, 10, 11 of the thread feeding device. She also receives 24 thread break signals from the thread monitors. The thread brakes 23, the thread feed device 8, the control unit 25, the Thread monitor 24 and the bobbins 21 are attached to a frame 26. The prewinding devices 22 are also on this frame attached by means of brackets, not shown.

In Fig. 1 ist noch eine Welle 27 dargestellt, die sich synchron mit der Hauptantriebswelle der Greiferwebmaschine dreht. Um die Winkelposition dieser Welle 27 zu bestimmen ist auf ihr eine Encoderscheibe 28 vorgesehen, die mit einem Sensor 29 zusammenarbeitet, der an die Steuereinheit 25 angeschlossen ist. Der Sensor 29 gibt in die Steuereinheit Signale ein, die die Winkelposition der Welle 27 repräsentieren. An die Steuereinheit 25 ist desweiteren eine Eingabeeinrichtung 30 angeschlossen, mit der Daten zur Steuerung der Fadenbremsen 23 eingegeben werden, um auch die Fadenbremsen in Abhängigkeit von der Winkelposition der Welle 27 und somit synchron zu dem Betrieb der Greiferwebmaschine und/oder in Abhängigkeit von dem Bewegungsverlauf des in ein Webfach 6 eingetragenen Schußfadens zu steuern. Eine derartige Steuerung ist beispielsweise aus der US 5 002 098 bekannt, so daß sie hier nicht weiter erläutert wird. In Fig. 1, a shaft 27 is shown, which is synchronous with the main drive shaft of the rapier weaving machine rotates. In order to determine the angular position of this shaft 27 on it an encoder disk 28 is provided, which has a sensor 29 cooperates, which is connected to the control unit 25 is. The sensor 29 sends signals to the control unit a, which represent the angular position of the shaft 27. An input device is also connected to the control unit 25 30 connected, with the data for controlling the thread brakes 23 can be entered depending on the thread brakes from the angular position of the shaft 27 and thus synchronously for the operation of the rapier weaving machine and / or depending of the course of movement of the entered in a shed 6 To control the weft. Such a control is known for example from US 5 002 098, so that it is not further explained here.

Die Fadenbremsen 23, auf die sich die vorliegende Erfindung bezieht, sind in Fig. 2 bis 7 dargestellt. Eine Fadenbremse 23 enthält zwei Bremselemente 31, 32, zwischen denen ein Schußfaden 3 gebremst werden kann. Ein Bremselement 31 ist stationär angeordnet, während das andere Bremselement 32 beweglich ist. Die Bremselemente 31, 32 sind wenigstens in dem Bereich, in welchem sie mit dem Schußfaden 3 in Berührung kommen, aus verschleißfestem Material oder mit einer verschleißfesten Beschichtung versehen. Die Fadenbremse 23 enthält ferner Belastungsmittel, um die Bremselemente 31, 32 aneinander zu drücken. Diese Belastungsmittel bestehen aus einem Elektromagneten 33 und einer Feder 34, die beide das bewegliche Bremselement 32 in Richtung zu dem stationären Bremselement 31 belasten. Die Bremselemente 31, 32 sind bei dem dargestellten Ausführungsbeispiel im wesentlichen vertikal ausgerichtet.The thread brakes 23 to which the present invention relates relates are shown in Figs. 2 to 7. A thread brake 23 contains two braking elements 31, 32, between which one Weft 3 can be braked. A braking element 31 is arranged stationary, while the other brake element 32 is movable is. The braking elements 31, 32 are at least in the Area in which they are in contact with the weft 3 come from wear-resistant material or with a wear-resistant Provide coating. The thread brake 23 contains further load means to the brake elements 31, 32 to each other to press. This burden consists of one Electromagnet 33 and a spring 34, both of which are movable Brake element 32 towards the stationary Load brake element 31. The braking elements 31, 32 are at the illustrated embodiment is substantially vertical aligned.

Das stationäre Bremselement 31 ist eine dünne, flexible Lamelle, die beispielsweise aus einem nicht oder nur wenig magnetisierbarem Stahl gefertigt ist und die fest an einer Halterung 35 befestigt ist. Die Halterung besteht aus nicht magnetisierbarem Material, beispielsweise aus einem Aluminiumgußteil. Das stationäre Bremselement 31 ist im Bereich seiner beiden Enden mit Öffnungen 36 versehen, so daß es mit Hilfe von Schrauben 37 an der Halterung 35 befestigt werden kann. Um das stationäre Bremselement satt an eine Gegenfläche der Halterung 35 anzulegen, ist ein Spannelement 38 vorgesehen. Das Spannelement 38 drückt mittels eines Stabes 39, insbesondere eines Gummistabes, das lamellenförmige Bremselement 31 in eine Einkerbung 40 der Halterung 35. Selbstverständlich ist es möglich, das Bremselement 31 auch in anderer Weise an der Halterung 35 zu befestigen, beispielsweise mittels Anklebens an die Halterung 35.The stationary brake element 31 is a thin, flexible disc, which, for example, consists of a magnet that cannot be magnetized or is only slightly magnetizable Steel is made and fixed to a bracket 35 is attached. The holder consists of non-magnetizable Material, for example from an aluminum casting. The stationary brake element 31 is in the area of it both ends with openings 36 so that it with the help can be attached by screws 37 to the bracket 35. To the stationary braking element snugly against a counter surface of the To apply bracket 35, a clamping element 38 is provided. The tensioning element 38 presses by means of a rod 39, in particular of a rubber rod, the lamellar braking element 31 into a notch 40 of the holder 35. Of course it is possible to apply the braking element 31 in a different way to fix the bracket 35, for example by gluing to the bracket 35.

Das bewegliche Bremselement 32 ist als eine Platte ausgeführt, deren Dicke in der Größenordnung von 1 mm oder weniger liegt. Das Bremselement 32 ist mit zwei Aussparungen 41, 42 versehen, die in Bewegungsrichtung A des zu bremsenden Schußfadens 3 in Abstand zueinander angeordnet sind. Diese Öffnungen 41, 42 befinden sich auch in unterschiedlichen Abständen zu der Bewegungsbahn des zu bremsenden Schußfadens 3. Der Grund hierfür wird noch erläutert werden. Die Halterung 35 ist mit zwei Stiften 43, 44 versehen. Die Stifte 43, 44, die beispielsweise aus Keramik bestehen, sind an der Halterung 35 fest angebracht, beispielsweise in Bohrungen der Halterung 35 eingeklebt. Die Stifte 43, 44, die im wesentlichen lotrecht zu den Bremselementen 31, 32 ausgerichtet sind, werden von den einen rechteckigen Querschnitt aufweisenden Öffnungen 41, 42 mit relativ großem Spiel umgeben. Die Stifte 43, 44 sind ebenfalls in unterschiedlichen Abständen zu der Bewegungsbahn des zu bremsenden Schußfadens 3 angeordnet. Wie in Fig. 4 dargestellt ist, besitzt die Aussparung 41 eine Kante 45, die an einem Berührungspunkt 47 an dem Stift 43 anliegt. Die Aussparung 42 besitzt ebenfalls eine Kante 46, die an einem Berührungspunkt 48 an dem Stift 44 anliegt. Die Berührungspunkte 47, 48 bestimmen eine Kippachse 49, um welche das plattenförmige Bremselement 32 gekippt werden kann. Wie aus Fig. 4 zu ersehen ist, verlaufen bei der bevorzugten Ausführungsform die Kanten 45, 46 im wesentlichen fluchtend zueinandern, so daß sie im wesentlichen mit der Kippachse 49 zusammenfallen.The movable brake element 32 is designed as a plate, their thickness on the order of 1 mm or less lies. The braking element 32 has two cutouts 41, 42 provided, in the direction of movement A of the weft thread to be braked 3 are arranged at a distance from each other. These openings 41, 42 are also at different distances to the trajectory of the weft thread to be braked 3. The The reason for this will be explained later. The bracket 35 is provided with two pins 43, 44. Pins 43, 44, consist of ceramic, for example, are on the holder 35 firmly attached, for example in holes in the holder 35 glued. The pins 43, 44 are substantially perpendicular to the braking elements 31, 32 are aligned by the openings 41 having a rectangular cross section, 42 surrounded with a relatively large game. The pins 43, 44 are also at different distances from the trajectory arranged to be braked weft 3. As in Fig. 4 is shown, the recess 41 has an edge 45 which abuts the pin 43 at a point of contact 47. The recess 42 also has an edge 46 which is at a point of contact 48 abuts the pin 44. The points of contact 47, 48 determine a tilt axis 49 around which the plate-shaped Brake element 32 can be tilted. As from Fig. 4 can be seen in the preferred embodiment the edges 45, 46 are essentially flush with one another, so that they essentially coincide with the tilt axis 49.

Wenn ein Schußfaden 3 mittels der Fadenbremse 23 gebremst wird, übt er ein Drehmoment M auf das plattenförmige Bremselement 32 aus, wie dies in Fig. 4 dargestellt ist. Dadurch wird das plattenförmige Bremselement 32 so verdreht, daß die Kante 45 der Aussparung 41 an dem Berührungspunkt 47 mit dem Stift 43 und die Kante 46 der Aussparung 42 an dem Berührungspunkt 48 an dem Stift 44 anliegt. Wegen dieses Drehmomentes M ist der Stift 43 auf der der Bewegungsbahn des Schußfadens 3 zugewandten Seite der Kippachse 49 angeordnet, während der Stift 44 auf der der Bewegungsbahn des Schußfadens 3 abgewandten Seite der Kippachse 49 angeordnet ist. Aus diesem Grund sind auch die beiden Aussparungen 41 und 42 entsprechend angeordnet, d.h. die Aussparung 41 näher an der Bewegungsbahn des Schußfadens 3 als die Aussparung 42.When a weft thread 3 is braked by means of the thread brake 23 he exerts a torque M on the plate-shaped braking element 32 as shown in FIG. 4. Thereby the plate-shaped brake element 32 is rotated so that the Edge 45 of the recess 41 at the point of contact 47 with the Pin 43 and edge 46 of recess 42 at the point of contact 48 abuts the pin 44. Because of this torque M is the pin 43 on the trajectory of the Arranged on the side of the tilt axis 49 facing the weft thread 3, while the pin 44 on the trajectory of the weft 3 facing away from the tilt axis 49 is arranged. Out for this reason the two cutouts 41 and 42 are also corresponding arranged, i.e. the recess 41 closer to the trajectory of the weft thread 3 as the recess 42.

Die durch die Berührungspunkte 47, 48 des plattenförmigen Bremselementes 32 mit den Stiften 43, 44 gebildete Kippachse 49 befindet sich in Abstand von der Bewegungsbahn des zu bremsenden Schußfadens. Die Kippachse 49 verläuft nahezu parallel zu dessen Bewegungsrichtung A. Bei dem dargestellten Ausführungsbeispiel ist zu sehen, daß die Kippachse 49 entsprechend der Ansicht nach Fig. 4 im wesentlichen parallel zur Bewegungsbahn des Schußfadens 3 und in der Draufsicht nach Fig. 5 unter einem relativ kleinen Winkel B zu dem Schußfaden 3 verläuft. Dieser relativ kleine Winkel B hat den Vorteil, daß der Schußfaden 3 das plattenförmige Bremselement 32 um seine Kippachse kippen kann. Bei dem dargestellten Ausführungsbeispiel verläuft die Kippachse 49 im wesentlichen horizontal.The through the points of contact 47, 48 of the plate-shaped Brake element 32 with the pins 43, 44 formed tilt axis 49 is at a distance from the trajectory of the braking weft. The tilt axis 49 runs almost parallel to its direction of movement A. In the illustrated Embodiment can be seen that the tilt axis 49 accordingly 4 essentially parallel to the path of movement of the weft thread 3 and in plan view 5 at a relatively small angle B to that Weft 3 runs. This relatively small angle B has the Advantage that the weft 3 the plate-shaped braking element 32 can tilt about its tilt axis. In the illustrated embodiment runs the tilt axis 49 substantially horizontal.

Die Bewegungsbahn des Schußfadens 3 wird bei dem dargestellten Ausführungsbeispiel von zwei Fadenführern 50, 51 bestimmt, die in nicht näher dargestellter Weise an der Halterung 35 befestigt sind, beispielsweise mit Schrauben. Die Halterung 35 ist weiter mit einer Öffnung 52 versehen, mittels der sie mit einem beispielsweise stangenförmigen Halter an dem Rahmen 26 befestigt werden kann.The path of movement of the weft thread 3 is shown in the Embodiment determined by two thread guides 50, 51, the on the bracket in a manner not shown 35 are attached, for example with screws. The Bracket 35 is further provided with an opening 52 by means of which they with, for example, a rod-shaped holder can be attached to the frame 26.

Die Feder 34, die als eine kegelstumpfförmig gewickelte Schraubenfeder ausgebildet ist, stützt sich einerseits auf dem plattenförmigen Bremselement 32 und andererseits an einer Einstellmutter 53 ab. Die Einstellmutter 53 ist auf eine Gewindespindel 54 aufgeschraubt, die eine im wesentlichen U-förmig gebogene Gestalt aufweist und an der Halterung 35 befestigt ist. Beispielsweise kann sie in eine Bohrung 55 der Halterung 35 eingeklebt sein. Durch Einstellen der Einstellmutter 53 kann die Vorspannung der Feder 34 und damit ihre Belastungskraft gewählt werden. Wie insbesondere aus Fig. 7 und 8 zu ersehen ist, überragt das plattenförmige Bremselement 32 das stationäre Bremselement 31 auf der Seite der Kippachse 49. Die Feder 34 ist so angeordnet und ausgerichtet, daß ihre Achse und damit der Schwerpunkt ihrer Belastungskraft auf einen Bereich gerichtet ist, der zwischen der Bewegungsbahn des Schußfadens 3 und der Kippachse 49 liegt.The spring 34, which is wound as a truncated cone Coil spring is formed, is based on the one hand the plate-shaped brake element 32 and on the other hand on one Adjusting nut 53. The adjusting nut 53 is on a threaded spindle 54 screwed on, which is essentially U-shaped has a curved shape and attached to the bracket 35 is. For example, it can be in a bore 55 of the Bracket 35 can be glued. By adjusting the adjusting nut 53 can the bias of the spring 34 and thus their Load force can be selected. As in particular from FIG. 7 and 8 can be seen, the plate-shaped braking element protrudes 32 the stationary braking element 31 on the side of the Tilt axis 49. The spring 34 is arranged and aligned that their axis and thus the focus of their resilience is directed to an area between the Path of movement of the weft thread 3 and the tilt axis 49 lies.

Wie insbesondere aus Fig. 6 zu ersehen ist, enthält der Elektromagnet 33 zwei gebogene Eisenstäbe 56, 57, deren außerhalb der Halterung 35 befindlichen Enden mittels eines Eisenstabes 58 verbunden sind. Auf diesem Eisenstab 58 ist eine Wicklung 59 vorgesehen. Die anderen Enden der Eisenstäbe 56, 57 enden als Pole 60, 61 an dem stationären Bremselement 31. Diese Pole 60, 61 sind dabei so angeordnet, daß die Bewegungsbahn des zu bremsenden Schußfadens 3 zwischen den beiden Polen 60, 61 liegt. Wie aus Fig. 3 und 6 zu ersehen ist, ist die Halterung 35 mit einem Hohlraum 62 versehen, in welchem die Eisenstäbe 56 und 57 und die Pole 60, 61 liegen. Dieser Hohlraum 62 ist mit einem isolierenden Kunststoff ausgefüllt, so daß sowohl die Eisenstäbe 56, 57 als auch der Eisenstab 58 und die Wicklung 59 schwingungsfrei gehalten sind. Die Wicklung 59 kann von der Steuereinheit 25 zu bestimmten Zeiten mit einem definierten Strom versorgt werden, so daß die erforderliche magnetische Kraft erzeugt wird, um das plattenförmige Bremselement 32 an die Pole 60, 61 heranzuziehen.As can be seen in particular from FIG. 6, the electromagnet contains 33 two curved iron bars 56, 57, the outside of which the holder 35 ends by means of an iron rod 58 are connected. There is a winding on this iron rod 58 59 provided. The other ends of the iron bars 56, 57 end as poles 60, 61 on the stationary braking element 31. These poles 60, 61 are arranged so that the trajectory of the weft thread 3 to be braked between the two poles 60, 61 lies. As can be seen from Figs. 3 and 6, the bracket 35 provided with a cavity 62 in which the iron bars 56 and 57 and the poles 60, 61 lie. This cavity is 62 filled with an insulating plastic, so that both the iron bars 56, 57 as well as the iron bar 58 and the winding 59 are kept vibration-free. The winding 59 can by the control unit 25 at certain times with a defined Power is supplied so that the required magnetic Force is generated to the plate-shaped braking element 32 to pull the poles 60, 61.

Der Elektromagnet 33 ist nur ein Ausführungsbeispiel. Jede Art von Spule und/oder Kern kann als Elektromagnet eingesetzt werden, der im Bereich von Polen 60, 61 ein Magnetfeld erzeugt, um das plattenförmige Bremselement 32 an das Bremselement 31 heranzuziehen.The electromagnet 33 is only one embodiment. each The type of coil and / or core can be used as an electromagnet which generates a magnetic field in the region of poles 60, 61, around the plate-shaped brake element 32 to the brake element 31 to be used.

Wie aus Fig. 3 zu ersehen ist, weist das stationäre Bremselement 31 eine etwa U-förmig gebogene Form auf. Sein (in der Einbauposition) oberer Rand 63 ist im Bereich des Stiftes 43 mit einer Aussparung 64 versehen, so daß der Rand 63 tangential zu der Oberseite des Stiftes 43 verläuft, d.h. zu dem Berührungspunkt 47 mit der Kante 45 der Aussparung 41 des plattenförmigen Bremselementes 32. Das fest montierte Bremselement 31 ist ferner so angeordnet, daß sein Rand 63 tangential zur Unterseite des Stiftes 44 verläuft, d.h. zu dem Berührungspunkt 48 zwischen der Kante 46 der Aussparung 42 des plattenförmigen Bremselementes 32. Der zwischen den Stiften 43 und 44 gelegene Abschnitt 65 des Randes 63 fällt somit im wesentlichen mit der Kippachse 49 zusammen. Der Abschnitt 65 unterstützt somit das plattenförmige Bremselement 32, wenn dies um seine Kippachse 49 kippt, wie dies insbesondere aus Fig. 6 und 7 zu ersehen ist. Wie insbesondere aus Fig. 3 zu ersehen ist, ist der Pol 60 des Elektromagneten 33 in der Nähe des Abschnittes 65 angeordnet und somit in der Nähe der Kippachse 49.As can be seen from Fig. 3, the stationary braking element 31 has an approximately U-shaped shape. Being (in the Installation position) upper edge 63 is in the area of the pin 43 provided with a recess 64 so that the edge 63 tangential runs to the top of the pin 43, i.e. to that Point of contact 47 with the edge 45 of the recess 41 of the plate-shaped brake element 32. The fixed brake element 31 is also arranged so that its edge 63 tangential runs to the bottom of the pin 44, i.e. to the point of contact 48 between the edge 46 of the recess 42 of the plate-shaped brake element 32. The between the pins 43 and 44 located section 65 of the edge 63 thus falls in essentially together with the tilt axis 49. Section 65 thus supports the plate-shaped brake element 32 when this tilts about its tilt axis 49, as in particular 6 and 7 can be seen. As in particular from FIG. 3 can be seen, the pole 60 of the electromagnet 33 is nearby of section 65 arranged and thus in the vicinity of Tilt axis 49.

Bei der dargestellten Ausführungsform ist die Fläche des plattenförmigen Bremselementes 32, die dem stationären Bremselement 31 gegenüberliegt, in dem Abschnitt im wesentlichen eben, der von den Polen 60, 61 des Elektromagneten angezogen wird und auf den die Feder 34 einwirkt. Der Einlaufbereich für den Schußfaden 3, d.h. der dem Fadenführer 50 zugewandte Bereich, des plattenförmigen Bremselementes 32 ist von dem stationären Bremselement 31 hinweg gekrümmt, so daß eine Einlaufschräge für den Schußfaden 3 geschaffen wird.In the illustrated embodiment, the area of the plate-shaped braking element 32, which is the stationary braking element 31 opposite, in the section essentially just that attracted to the poles 60, 61 of the electromagnet and acts on the spring 34. The entry area for the weft 3, i.e. the thread guide 50 facing The area of the plate-shaped brake element 32 is from that stationary braking element 31 curved away, so that an inlet slope is created for the weft 3.

Beim Weben wird das bewegliche Bremselement 32 mittels der Feder 34 zu dem stationären Bremselement 31 hin belastet, so daß der Schußfaden 3 zwischen den Bremselementen 31 und 32 gebremst wird. Die Feder 34 ist relativ schwach, so daß die durch die Feder 34 aufgebrachte Bremskraft relativ gering ist. Diese Bremskraft kann durch Verdrehen der Einstellmutter 53 auf der Gewindespindel 54 eingestellt werden. Wenn während eines Schußeintrages eine höhere Bremskraft erforderlich ist, so wird der Elektromagnet 33 angesteuert, so daß das bewegliche Bremselement 32 von dem Polen 60 und 61 angezogen wird. Der Schußfaden 3 wird dann zwischen dem stationären Bremselement 31 und dem beweglichen Bremselement 32 stärker geklemmt. Da das stationäre Bremselement 31 aus einem nicht oder wenig magnetisierbaren Material besteht, kann das bewegliche Bremselement 32 mit einer relativ großen Kraft von dem Elektromagneten 33 angezogen werden.When weaving, the movable brake element 32 is by means of the Spring 34 loaded to the stationary brake element 31, so that the weft 3 between the brake elements 31 and 32nd is braked. The spring 34 is relatively weak, so that braking force applied by the spring 34 is relatively low is. This braking force can be achieved by turning the adjusting nut 53 can be set on the threaded spindle 54. If during a higher braking force is required for a shot entry, so the electromagnet 33 is driven so that the movable Brake element 32 is attracted to the poles 60 and 61. The weft 3 is then between the stationary braking element 31 and the movable brake element 32 clamped more. Since the stationary braking element 31 is not or little there is magnetizable material, the movable brake element 32 with a relatively large force from the electromagnet 33 to be tightened.

Wenn sich der Schußfaden 3, wie dies beispielweise in Fig. 6 dargestellt ist, zwischen dem stationären Bremselement 31 und dem beweglichen Bremselement 32 befindet, nimmt das bewegliche Bremselement 32 eine Position ein, in der es an dem Abschnitt 65 des Randes 63 des stationären Bremselementes 31 abgestützt ist. Dieses Abkippen ist möglich, da oberhalb des stationären Bremselementes 31 in der Halterung 35 ein Freiraum 66 belassen ist. Das plattenförmige Bremselement 32 ist somit um die Kippachse 49 und/oder den Abschnitt 65 des Randes 63 des stationären Bremselementes 31 leicht gekippt. Wenn - wie dies in Fig. 7 dargestellt ist - eine Verdickung 67 des Schußfadens 3 durch die Fadenbremse 23 läuft, so kippt diese Verdickung 67 das bewegliche Bremselement 32 von dem stationären Bremselement weiter hinweg, wobei das bewegliche Bremselement 32 um die Kippachse 49 kippt, die im wesentlichen mit dem Abschnitt 65 zusammenfällt. Das Kippen des beweglichen Bremselementes 32 wird durch die Stifte 43, 44 nicht behindert, da die Aussparungen 41, 42 quer zur Bewegungsrichtung A des Fadens ein relativ großes Spiel zu den Stiften 43, 44 aufweisen. Da der Schußfaden 3 zum Bremsen zwischen den Bremselementen 31, 32 ein Drehmoment M auf das bewegliche Bremselement 32 ausübt, werden die Kanten 45 und 46 der Aussparungen 41 und 42 gegen die jeweiligen Stifte 43 und 44 gedrückt. Die Öffnungen 41, 42 können gegenüber den Stiften 43, 44 deshalb relativ groß sein, ohne daß sich das bewegliche Bremselement 32 während des Betriebes um eine horizontale Achse dreht. Die Kippachse 49 bleibt somit während des Webens durch die Verbindungslinie zwischen dem Berührungspunkt 47 des Stiftes 43 mit der Kante 45 der Aussparung 41 und dem Berührungspunkt 48 des Stiftes 44 mit der Kante 46 der Aussparung 42 bestimmt.If the weft thread 3, as shown, for example, in FIG. 6 is shown between the stationary brake element 31 and the movable brake element 32, takes the movable Brake element 32 a position in which it is on the section 65 of the edge 63 of the stationary brake element 31 is supported. This tipping is possible because above the stationary brake element 31 in the holder 35, a free space 66 is left. The plate-shaped brake element 32 is thus about the tilt axis 49 and / or the section 65 of the edge 63 of the stationary brake element 31 slightly tilted. If - As shown in Fig. 7 - a thickening 67 of Weft thread 3 runs through the thread brake 23, this tilts Thicken 67 the movable brake element 32 from the stationary Brake element further away, the movable brake element 32 tilts about the tilt axis 49, which essentially with section 65 coincides. Tilting the moveable Brake element 32 is not hindered by the pins 43, 44 since the recesses 41, 42 transverse to the direction of movement A the thread a relatively large game to the pins 43, 44th exhibit. Since the weft 3 for braking between the Brake elements 31, 32 a torque M on the movable Exercises braking element 32, the edges 45 and 46 of the recesses 41 and 42 pressed against the respective pins 43 and 44. The openings 41, 42 can be compared to the pins 43, 44 can therefore be relatively large without moving Brake element 32 around a horizontal during operation Axis rotates. The tilt axis 49 thus remains during weaving through the connecting line between the contact point 47 of the pin 43 with the edge 45 of the recess 41 and the point of contact 48 of the pin 44 with the edge 46 of the recess 42 determined.

Bei dem Ausführungsbeispiel nach Fig. 8 ist die Halterung 35 mit einem Steg 68 versehen, der den oberen Rand des stationären Bremselementes 31 einfaßt. Dieser Steg 68 verläuft so, wie es bei dem vorausgehend beschriebenen Ausführungsbeispiel bezüglich des Abschnittes 65 des oberen Randes 63 des stationären Bremselementes 31 beschrieben wurde. Der Steg 68 bildet somit einen oberen Rand 69, der im wesentlichen mit der Kippachse 49 zusammenfällt, so daß das bewegliche Bremselement 32 an diesem Rand 69 abgestützt ist. Die Verwendung eines Steges hat gegebenenfalls den Vorteil, daß das stationäre Bremselement 31 nicht unbedingt exakt positioniert angebracht werden muß.8, the holder 35 provided with a web 68 which the upper edge of the stationary Braking element 31 borders. This web 68 runs in such a way as in the previously described embodiment with respect to section 65 of the upper edge 63 of the stationary Brake element 31 has been described. The web 68 forms thus an upper edge 69 which is essentially with the tilt axis 49 coincides, so that the movable brake element 32nd is supported on this edge 69. The use of a web may have the advantage that the stationary braking element 31 not necessarily be positioned exactly got to.

Bei dem Ausführungsbeispiel nach Fig. 9 ist die dem stationären Bremselement 31 zugewandte Fläche des beweglichen Bremselementes 32 leicht konvex gewölbt. Zumindest ist sie auf der dem Fadenführer 50 zugewandten Einlaufseite, d.h. wo der zu bremsende Schußfaden zuerst mit dem Bremselement 32 in Kontakt kommt von dem stationären Bremselement 31 hinweg gekrümmt. Die dem beweglichen Bremselement 32 zugewandte Fläche des stationären Bremselementes 31 ist ebenfalls leicht konvex gekrümmt. Der obere Rand 70 des stationären Bremselementes 31 ist somit im Bereich zwischen den Stiften 43, 44 ebenfalls leicht konvex gekrümmt. Dies ist beim Kippen des beweglichen Bremselementes 32 von Vorteil, da das Bremselement 32 nur über eine kurze Strecke an dem Rand 70 anliegt, so daß das Kippen des Bremselementes 32 gegen einen relativ geringen Widerstand erfolgen kann. Die Kippachse 49 wird auch bei dieser Ausführungsform von den Stiften 43, 44 so festgelegt, daß sie im wesentlichen parallel zu dem zu bremsenden Schußfaden 3 verläuft. In der Draufsicht nach Fig. 9 bildet die Kippachse 49 einen relativ kleinen Winkel C mit dem zu bremsenden Schußfaden 3, so daß insgesamt die Kippachse 49 im wesentlichen parallel zu dem zu bremsenden Schußfaden 3 verläuft und das Bremselement 32 daher in einfacher Weise gekippt werden kann.9 is the stationary Brake element 31 facing surface of the movable brake element 32 slightly convex. At least it is on the the thread side 50 facing the inlet side, i.e. where the too braking weft first in contact with the braking element 32 comes curved away from the stationary brake element 31. The surface facing the movable brake element 32 the stationary brake element 31 is also slightly convex curved. The upper edge 70 of the stationary brake element 31 is thus also in the area between the pins 43, 44 slightly convex. This is when tilting the moveable Brake element 32 is advantageous because the brake element 32 only abuts the edge 70 over a short distance, so that the Tilting the braking element 32 against a relatively low resistance can be done. The tilt axis 49 is also in this Embodiment of the pins 43, 44 set so that they essentially parallel to the weft thread 3 to be braked runs. 9 forms the tilt axis 49 a relatively small angle C with that to be braked Weft thread 3, so that the total tilt axis 49 essentially runs parallel to the weft thread 3 to be braked and the braking element 32 can therefore be tilted in a simple manner can.

Die Bewegungsbahn des zu bremsenden Schußfadens 3 muß nicht durch die beiden Fadenführer 50, 51 bestimmt werden, die an der Halterung 35 der Fadenbremse 23 angebracht sind. Die Funktion des ersten Fadenführers 50 kann von einem Fadenführer am Ausgang des Vorspulgerätes 22 und die Funktion des zweiten Fadenführers 51 kann von einem Fadenführer des Fadenwächters 24 übernommen werden. In diesem Fall sollte der Abstand zwischen dem Vorspulgerät 22 und der Fadenbremse 23 und der Abstand zwischen der Fadenbremse 23 und dem Fadenwächter 24 relativ klein sein.The path of movement of the weft thread 3 to be braked does not have to be determined by the two thread guides 50, 51, the the holder 35 of the thread brake 23 are attached. The Function of the first thread guide 50 can be performed by a thread guide at the output of the pre-winder 22 and the function of second thread guide 51 can be a thread guide of the thread monitor 24 are taken over. In this case, the distance between the pre-winding device 22 and the thread brake 23 and the distance between the thread brake 23 and the thread monitor 24 be relatively small.

Anstelle der Fadenführer 50, 51 in Form von Stäben oder Stangen können auch andere Ausführungsformen von Fadenführern vorgesehen werden, beispielsweise Fadenführer in Form von Fadenaugen.Instead of the thread guides 50, 51 in the form of bars or rods can also other embodiments of thread guides are provided, for example thread guides in the form of thread eyes.

Die Fadenbremse 23 ist im Vorstehenden nur für den Schußfaden 3 beschrieben worden. Selbstverständlich können die Fadenbremsen 23 für die Schußfäden 4 und 5 in gleicher Weise ausgeführt sein.The thread brake 23 is only for the weft thread in the above 3 has been described. Of course, the thread brakes 23 for the weft threads 4 and 5 executed in the same way his.

Die in den Ausführungsbeispielen dargestellte und beschriebene Fadenbremse zum Bremsen von Schußfäden 3, 4, 5 einer Greiferwebmaschine kann selbstverständlich auch zum Bremsen von Schußfäden bei anderen Webmaschinentypen verwendet werden, beispielsweise Luftdüsenwebmaschinen, Wasserstrahlwebmaschinen, Projektilwebmaschinen oder beliebigen anderen Webmaschinentypen. Darüber hinaus kann die Fadenbremse 23 auch zum Bremsen eines Fadens bei anderen Arten von Textilmaschinen verwendet werden, beispielsweise bei Spulmaschinen, Bäummaschinen, Strickmaschinen oder anderen Maschinenarten, bei denen ein Faden gebremst werden muß.The illustrated and described in the exemplary embodiments Thread brake for braking weft threads 3, 4, 5 of a rapier weaving machine can of course also be used to brake Weft threads are used in other types of weaving machines, for example air jet looms, water jet looms, Projectile looms or any other type of loom. In addition, the thread brake 23 can also Braking a thread in other types of textile machines are used, for example in winding machines, building machines, Knitting machines or other types of machines where a thread must be braked.

Die Erfindung beschränkt sich nicht auf die beispielhaft beschriebene und dargestellte Ausführungsform. Der durch die Patentansprüche bestimmte Gegenstand kann auch in anderen Formen verwirklicht werden.The invention is not limited to that described by way of example and illustrated embodiment. The one through the Certain subject matter can also be claimed in others Forms can be realized.

Claims (12)

  1. Yarn brake (23) with a displaceable, plate-shaped braking element (32), which can be applied against a stationary braking element (31) by biassing means (33, 34) in order to brake a yarn (3, 4, 5) running between the braking elements (31, 32), wherein the yarn (3, 4, 5) is guided along a feed path between the braking elements (31, 32), the plate-shaped braking element (32) projecting beyond the stationary braking element (31) transversely to the feed path of the yarn and being supported at a distance from the feed path of the yarn so that it can be tilted by means of a pivot axis (49) aligned substantially parallel with the feed path of the yarn (3, 4, 5).
  2. Yarn brake as claimed in claim 1 wherein the plate-shaped braking element (32) is retained by means of two pins (43, 44) which are disposed substantially perpendicular to the stationary braking element (31) and at a distance from one another in the feed direction (A) of the yarn (3) to be braked, the first pin (43) in the feed direction (A) of the yarn (3) being disposed on the side of the pivot axis (49) facing the feed path of the yarn (3) and the second pin (44) being disposed on the side of the pivot axis (49) remote from the feed path of the yarn (3), and wherein the plate-shaped braking element (32) is provided with cut-out sections (41, 42) enclosing the pins (43, 44) with a clearance.
  3. Yarn brake as claimed in claim 2, wherein the cut-out sections (41, 42) have straight edges (45, 46) running in the direction of the pivot axis (49).
  4. Yarn brake as claimed in one of claims 1 to 3, wherein the pivot axis (49) coincides with an edge (63, 65) of the stationary braking element (31) running substantially parallel with the feed direction (A) of the yarn (3).
  5. Yarn brake as claimed in one of claims 1 to 3, wherein the pivot axis (49) coincides with an edge of a land (69) of a holder (35) skirting the stationary braking element (31) running substantially parallel with the feed direction (A) of the yarn (3).
  6. Yarn brake as claimed in claim 4 or 5, wherein the edge (63, 65) of the stationary braking element (31) or the edge (69) of the land (68) skirting the stationary braking element (31) is straight or has a convex curvature substantially perpendicular to the braking surface of the braking element (31).
  7. Yarn brake as claimed in one of claims 1 to 6, wherein the braking elements (31, 32) are substantially vertically and the pivot axis (49) substantially horizontally aligned.
  8. Yarn brake as claimed in one of claims 1 to 7, wherein the biassing means for the plate-shaped braking element (32) made from a magnetisable material is a spring (34) with a preferably adjustable biassing force and a switchable electromagnet (33).
  9. Yarn brake as claimed in claim 8, wherein the electromagnet (33) has two poles (60, 61) which are disposed on the side of the stationary braking element (31) on either side of the feed path of the yarn (3).
  10. Yarn brake as claimed in claim 9, wherein one pole (60) of the electromagnet (33) is disposed at least more or less in the region of the pivot axis (49).
  11. Yarn brake as claimed in one of claims 1 to 10, wherein the stationary braking element (31) and/or the displaceable braking element (32) are provided with an inclined lead-in in a lead-in region for the yarn (3) to be braked.
  12. Yarn brake as claimed in one of claims 1 to 11, wherein the pivot axis (49) - as seen in plan view - is oriented at a tapering angle (B, c) relative to the feed path of the yarn (3) in the feed direction (A) of the yarn (3).
EP98928191A 1997-04-07 1998-04-07 Yarn tensioning device Expired - Lifetime EP0973686B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9700316 1997-04-07
BE9700316A BE1011089A3 (en) 1997-04-07 1997-04-07 Yarn brake WITH TWO brake elements.
PCT/EP1998/002015 WO1998045201A1 (en) 1997-04-07 1998-04-07 Yarn tensioning device

Publications (2)

Publication Number Publication Date
EP0973686A1 EP0973686A1 (en) 2000-01-26
EP0973686B1 true EP0973686B1 (en) 2002-07-10

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US (1) US6161595A (en)
EP (1) EP0973686B1 (en)
BE (1) BE1011089A3 (en)
DE (1) DE59804724D1 (en)
ES (1) ES2178221T3 (en)
WO (1) WO1998045201A1 (en)

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WO2009096800A1 (en) * 2008-02-01 2009-08-06 Instytut Technologii Eksploatacji-Panstwowy Instytut Badawczy Yarn tensioning methods, yarn tensioning device, a armature of an electromagnet for the yarn tensioning device, and use of the yarn tensioning device armature
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DE102021129142A1 (en) 2021-11-09 2023-05-11 Maschinenfabrik Rieter Ag Yarn tensioner and workplace of a textile machine with a yarn tensioner

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ES2178221T3 (en) 2002-12-16
US6161595A (en) 2000-12-19
WO1998045201A1 (en) 1998-10-15
EP0973686A1 (en) 2000-01-26
BE1011089A3 (en) 1999-04-06
DE59804724D1 (en) 2002-08-14

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