EP0973686A1 - Yarn tensioning device - Google Patents

Yarn tensioning device

Info

Publication number
EP0973686A1
EP0973686A1 EP98928191A EP98928191A EP0973686A1 EP 0973686 A1 EP0973686 A1 EP 0973686A1 EP 98928191 A EP98928191 A EP 98928191A EP 98928191 A EP98928191 A EP 98928191A EP 0973686 A1 EP0973686 A1 EP 0973686A1
Authority
EP
European Patent Office
Prior art keywords
thread
movement
brake
stationary
braking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98928191A
Other languages
German (de)
French (fr)
Other versions
EP0973686B1 (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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Picanol NV filed Critical Picanol NV
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
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • 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 which can be pressed against a stationary braking element by means of loading means in order to brake a thread running between the braking elements.
  • Thread brakes of the type mentioned are known from FR-A 1 161 662, IT 593 034 and FR-A 2 300 734.
  • the movable brake element is pressed against a stationary brake element by means of its own weight, by means of a force which can be set by magnetic means and / or by means of a force which can be set by compressed air means.
  • Such thread brakes have the disadvantage that they can lead to damage and / or breakage of threads, especially if the threads have nubs or thick spots and / or other irregularities.
  • a thread brake is known from DE 21 30 670, which is provided with two pairs of movable, plate-shaped brake elements. These brake elements are each attached to two pins without jamming, for which purpose they are provided with correspondingly large cutouts. Between the two pairs of brake elements, an electromagnet is arranged, the armature of which is provided with a bridge, each on the outer Brake elements abuts and presses them against the inner brake elements.
  • a thread tensioner or a thread brake from GB-A 20 93 488 is also known, which has two plate-shaped braking elements, between which the thread to be braked runs.
  • This thread brake contains an electromagnet that forms two poles.
  • a first plate-shaped braking element which consists of non-magnetizable material, is applied to the two poles.
  • the second, outer brake element consists of magnetizable material and can be used by means of the magnetic force on the brake element consisting of non-magnetizable material.
  • the two plate-shaped brake elements are aligned essentially vertically and attached to two bolts. The path of movement of the thread to be braked runs horizontally essentially in the middle of both braking elements.
  • a thread brake is known from CH-A 68 21 48, by means of which two threads running in parallel can be braked at two successive points.
  • Each braking point has three plate-shaped braking elements, ie a central braking element and two outer braking elements.
  • the threads run on both sides of the central braking element, so that they can be braked between the central and an outer braking element.
  • the three braking elements are held in a hook-shaped guide with an edge running parallel to the path of movement of the thread.
  • One of the two outer brake elements lies against a wall of a bracket.
  • the opposite outer brake element is loaded by means of an adjustable spring force and can be pressed in the direction of the middle and the other outer brake element.
  • the path of movement of the threads lies between the edge of the brake elements guided in the hook guide elements and the point of application for the loading force.
  • the invention has for its object to provide a thread brake of the type mentioned so that the risk of damage and / or breakage of threads is reduced, even if these threads have knobs, thick spots, thin spots or other irregularities.
  • This object is achieved in that the thread is guided along a path of movement between the braking elements, that the plate-shaped braking element projects transversely to the path of movement of the thread over the stationary braking element and is supported tiltably at a distance from the path of movement of the thread by means of a tilting axis which is essentially parallel is aligned with the path of movement of the thread.
  • the movable brake element can tilt in a simple manner about the predetermined tilting axis if knobs or other irregularities of a thread run in between the brake elements, so that these can run largely without a sudden increase in the braking force or without significant impediment from the thread brake.
  • the plate-shaped braking element is held by means of two pins which are arranged substantially perpendicular to the stationary braking element and in the direction of movement of the thread to be braked at a distance from each other, of 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 are arranged on the side of the tilting axis facing away from the path of movement of the thread, and that the plate-shaped braking element is provided with recesses surrounding the pins with play.
  • the tilt axis of the plate-shaped brake element is determined by the contact points at which the recesses of the plate-shaped brake element touch the pins.
  • the tilt axis coincides with an edge of the stationary braking element which runs essentially parallel to the direction of movement of the thread.
  • the tilt axis coincides with an edge of a holding part which surrounds the stationary braking element and runs essentially parallel to the direction of movement of the thread. In both cases, it is ensured that the plate-shaped brake element also bears against a defined tilting axis in the area between the pins.
  • edge that defines the tilt axis outside the area of the pins can run in a straight line.
  • edge of the stationary brake element or the edge of the web enclosing the stationary brake element is essentially convexly curved to the braking surface of the brake elements. This simplifies the tilting movement of the movable brake element.
  • the braking elements are aligned essentially vertically and the tilting axis is aligned essentially horizontally. This arrangement is advantageous with regard to the tilting movement of the movable brake element, since its own weight has little influence on the tilting movement and thus a relatively heavy movable brake element can be used. This is particularly advantageous if the loading means contain an electromagnet.
  • a spring with preferably adjustable loading is used as the loading means for the plate-shaped braking element consisting of magnetizable material.
  • Stungskraft and a switchable electromagnet serve.
  • the electromagnet has two poles which are arranged on the side of the stationary braking element on both sides of the path of movement of the thread. It is expedient if one of the poles of the electromagnet is arranged approximately in the region of the tilt axis. This has the advantage that the movable brake element can still tip about the tilting axis even when loaded by means of the electromagnet.
  • the stationary brake element and / or the movable brake element are provided with a run-in slope in a run-in area for the thread to be braked. This is advantageous for the thread to pass through the thread brake.
  • the tilting axis - seen in plan view - is oriented at an angle tapering in the direction of movement of the thread to the path of movement of the thread. A thickening entering the thread brake can then tilt the movable brake element relatively easily.
  • FIG. 1 shows a schematic representation of a rapier weaving machine with several thread brakes according to the invention
  • FIG. 2 is a perspective view on a larger scale of a thread brake according to the invention
  • FIG. 3 is an exploded view of the thread brake of FIG. 2 (without a resilient loading device)
  • 4 is a front view of the thread brake according to the invention according to FIGS. 2 and 3 (without resilient loading device)
  • FIGS. 2 to 4 are plan views of the thread brake according to FIGS. 2 to 4,
  • FIGS. 2 to 5 shows a partially sectioned illustration of the thread brake according to FIGS. 2 to 5
  • FIG. 7 is a partial section corresponding to FIG. 6 on a larger scale while passing through a thick spot
  • Fig. 8 is a partial section corresponding to Fig. 7 on a modified embodiment while passing the thread through the thread brake and
  • Fig. 9 is a plan view similar to FIG. 5 of a modified embodiment of a thread brake.
  • the rapier weaving machine shown in FIG. 1 has a donor rapier 1 and a slave rapier 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 raised and lowered by means of shed forming means, not shown.
  • the weft threads are fed to the donor gripper 1 by means of needles 9, 10, 11 of a thread feed device 8, picked up by the donor gripper 1, cut off in the region of a guide 14 in the region of the selvedge 15 in the area of the selvedge 15 by means of a weft scissors 12 and then by means of the donor gripper 1 brought up to about the middle of the shed 6.
  • the slave gripper 2 moves from the opposite side 16 substantially in synchronism with the master gripper 1 into the shed 6 and out of it again. Essentially in the middle of the shed 6, the respective weft thread is removed from the donor gripper 2 from the donor gripper 1 and from the receiver gripper 2 to the opposite side. the page 16 of the shed 6 transported. Thereafter, the weft thread is released on this side by the slave gripper and then hit by the reed 17 on the fabric edge of the fabric 18, after which they are bound in by the warp threads 7.
  • the encoder gripper 1 and the slave gripper 2 are each arranged on driven gripper belts 19, 20, by means of which they are moved into and out of the shed 6.
  • the weft threads 3, 4, 5 run from bobbins 21 via pre-unwinder
  • a control device 25 controls the pre-unwinder 22, the thread brakes 23 and the needles 9, 10, 11 of the thread feeding device. It also receives 24 thread break signals from the thread monitors.
  • the thread feed device 8 the control unit 25, the thread monitor 24 and the bobbins 21 are attached to a frame 26.
  • the pre-winding devices 22 are also fastened to this frame by means of brackets (not shown).
  • a shaft 27 is shown, which rotates synchronously with the main drive shaft of the rapier weaving machine.
  • an encoder disk 28 is provided on it, which works together with a sensor 29 which is connected to the control unit 25.
  • the sensor 29 inputs signals into the control unit that represent the angular position of the shaft 27.
  • An input device 30 is also connected to the control unit 25, by means of which data for controlling the thread brakes 23 are input, in order also the thread brakes as a function of the angular position of the shaft 27 and thus in synchronism with the operation of the rapier weaving machine and / or as a function of the movement profile to control the weft thread entered in a shed 6.
  • a thread brake 23 contains two brake elements 31, 32, between which a weft thread 3 can be braked.
  • One brake element 31 is arranged stationary, while the other brake element 32 is movable.
  • the brake elements 31, 32 are at least in the area in which they come into contact with the weft thread 3 made of wear-resistant material or with a wear-resistant coating.
  • the thread brake 23 also contains loading means in order to press the brake elements 31, 32 against one another. These loading means consist of an electromagnet 33 and a spring 34, both of which load the movable brake element 32 in the direction of the stationary brake element 31.
  • the braking elements 31, 32 are aligned substantially vertically in the illustrated embodiment.
  • the stationary brake element 31 is a thin, flexible disk, which is made, for example, of a steel that cannot be magnetized or is only slightly magnetized, and which is firmly attached to a holder 35.
  • the holder is made of non-magnetizable material, for example an aluminum casting.
  • the stationary brake element 31 is provided with openings 36 in the region of its two ends so that it can be fastened to the holder 35 with the aid of screws 37.
  • a clamping element 38 is provided in order to fit the stationary braking element snugly against a counter surface of the holder 35.
  • the tensioning element 38 presses the lamellar brake element 31 into a notch 40 in the holder 35 by means of a rod 39, in particular a rubber rod.
  • a rod 39 in particular a rubber rod.
  • the movable brake element 32 is designed as a plate, the thickness of which is of the order of 1 mm or less.
  • the braking element 32 has two cutouts 41, 42 provided, which are arranged at a distance from each other in the direction of movement A of the weft thread 3 to be braked. These openings 41, 42 are also at different distances from the path of movement of the weft thread 3 to be braked. The reason for this will be explained below.
  • the bracket 35 is provided with two pins 43, 44.
  • the pins 43, 44 which consist for example of ceramic, are fixedly attached to the holder 35, for example glued into bores in the holder 35.
  • the pins 43, 44 which are aligned substantially perpendicular to the braking elements 31, 32, are surrounded by the openings 41, 42, which have a rectangular cross section, with a relatively large amount of play.
  • the pins 43, 44 are also arranged at different distances from the path of movement of the weft thread 3 to be braked.
  • the recess 41 has an edge 45 which bears against the pin 43 at a contact point 47.
  • the recess 42 also has an edge 46 which bears against the pin 44 at a point of contact 48.
  • the contact points 47, 48 determine a tilt axis 49 about which the plate-shaped brake element 32 can be tilted.
  • the edges 45, 46 run essentially flush with one another, so that they essentially coincide with the tilt axis 49.
  • the tilt axis 49 formed by the points of contact 47, 48 of the plate-shaped brake element 32 with the pins 43, 44 is at a distance from the path of movement of the weft thread to be braked.
  • the tilt axis 49 runs almost parallel to its direction of movement A.
  • the tilt axis 49 according to the view in FIG. 4 is essentially parallel to the path of movement of the weft thread 3 and in the top view in FIG. 5 under a relatively small one Angle B runs to the weft 3.
  • This relatively small angle B has the advantage that the weft thread 3 can tilt the plate-shaped brake element 32 about its tilt axis.
  • the tilt axis 49 is essentially horizontal.
  • the path of movement of the weft thread 3 is determined in the illustrated embodiment by two thread guides 50, 51, which are fastened to the holder 35 in a manner not shown, for example with screws.
  • the holder 35 is further provided with an opening 52, by means of which it can be fastened to the frame 26 with, for example, a rod-shaped holder.
  • the spring 34 which is designed as a truncated cone-shaped coil spring, is supported on the one hand on the plate-shaped brake element 32 and on the other hand on an adjusting nut 53.
  • the adjusting nut 53 is screwed onto a threaded spindle 54, which has an essentially U-shaped shape and is fastened to the holder 35. For example, it can be glued into a bore 55 in the holder 35.
  • the bias of the spring 34 and thus its loading force can be selected.
  • the plate-shaped brake element 32 projects beyond the stationary brake element 31 on the side of FIG Tilt axis 49.
  • the spring 34 is arranged and aligned in such a way that its axis and thus the center of gravity of its loading force is directed to an area which lies between the path of movement of the weft thread 3 and the tilt axis 49.
  • the electromagnet 33 contains two bent iron rods 56, 57, the ends of which are located outside the holder 35 by means of an iron rod
  • the holder 35 is provided with a cavity 62 in which the iron rods 56 and 57 and the poles 60, 61 are located.
  • This cavity 62 is filled with an insulating plastic, so that both the iron rods 56, 57 and the iron rod 58 and the winding 59 are kept free of vibrations.
  • the winding 59 can be supplied with a defined current by the control unit 25 at certain times, so that the required magnetic force is generated in order to pull the plate-shaped braking element 32 towards the poles 60, 61.
  • the electromagnet 33 is only one embodiment. Any type of coil and / or core can be used as an electromagnet, which generates a magnetic field in the region of poles 60, 61 in order to pull the plate-shaped brake element 32 towards the brake element 31.
  • the stationary brake element 31 has an approximately U-shaped shape. Its (in the installed position) upper edge 63 is provided in the region of the pin 43 with a recess 64, so that the edge 63 extends tangentially to the top of the pin 43, ie to the 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 such that its edge 63 extends tangentially to the underside of pin 44, ie to the point of contact 48 between edge 46 of recess 42 of plate-shaped braking element 32. Section 65 of the edge located between pins 43 and 44 63 thus essentially coincides with the tilt axis 49.
  • the section 65 thus supports the plate-shaped brake element 32 when it tilts about its tilt axis 49, as can be seen in particular from FIGS. 6 and 7.
  • the pole 60 of the electromagnet 33 is arranged in the vicinity of the section 65 and thus in the vicinity of the tilt axis 49.
  • the surface of the plate-shaped brake element 32 which lies opposite the stationary brake element 31, is essentially flat in the section which is attracted by the poles 60, 61 of the electromagnet and on which the spring 34 acts.
  • the infeed area for the weft 3, i.e. the area facing the thread guide 50 of the plate-shaped brake element 32 is curved away from the stationary brake element 31, so that an entry slope for the weft thread 3 is created.
  • the movable brake element 32 is loaded by the spring 34 toward the stationary brake element 31, so that the weft thread 3 between the brake elements 31 and 32 is braked.
  • the spring 34 is relatively weak, so that the braking force applied by the spring 34 is relatively low. This braking force can be adjusted by turning the adjusting nut 53 on the threaded spindle 54. If a higher braking force is required during a weft insertion, the electromagnet 33 is activated so that the movable brake element 32 is attracted by the poles 60 and 61. The weft thread 3 is then clamped more strongly between the stationary brake element 31 and the movable brake element 32. Since the stationary brake element 31 consists of a material that cannot be magnetized or is hardly magnetizable, the movable brake element 32 are attracted by a relatively large force from the electromagnet 33.
  • the movable brake element 32 assumes a position in which it rests on the section 65 of the edge 63 of the stationary brake element 31 is supported. This tilting is possible because a space 66 is left in the holder 35 above the stationary brake element 31.
  • the plate-shaped brake element 32 is thus slightly tilted about the tilt axis 49 and / or the section 65 of the edge 63 of the stationary brake element 31. If - as shown in FIG.
  • the openings 41, 42 can therefore be relatively large compared to the pins 43, 44 without the movable brake element 32 rotating during operation about a horizontal axis.
  • the tilt axis 49 thus remains determined during weaving by the connecting line between the point of contact 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.
  • the holder 35 is provided with a web 68 which the upper edge of the stationary ren brake element 31 surrounds.
  • This web 68 runs in the same way as was described in the exemplary embodiment described above with regard to the section 65 of the upper edge 63 of the stationary braking element 31.
  • the web 68 thus forms an upper edge 69 which substantially coincides with the tilt axis 49, so that the movable brake element 32 is supported on this edge 69.
  • the use of a web may have the advantage that the stationary braking element 31 does not necessarily have to be positioned exactly.
  • the surface of the movable brake element 32 facing the stationary brake element 31 is curved slightly convexly. At least it is on the inlet side facing the thread guide 50, i.e. where the weft to be braked first comes into contact with the braking element 32 curved away from the stationary braking element 31.
  • the surface of the stationary brake element 31 facing the movable brake element 32 is also slightly convexly curved.
  • the upper edge 70 of the stationary brake element 31 is thus also slightly convex in the area between the pins 43, 44. This is advantageous when the movable brake element 32 is tilted, since the brake element 32 only lies against the edge 70 for a short distance, so that the brake element 32 can be tilted against a relatively low resistance.
  • the tilt axis 49 is fixed by the pins 43, 44 in such a way that it runs essentially parallel to the weft thread 3 to be braked.
  • the tilt axis 49 forms a relatively small angle C with the weft thread 3 to be braked, so that overall the tilt axis 49 runs essentially parallel to the weft thread 3 to be braked and the braking element 32 can therefore be tilted in a simple manner .
  • 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 which are on the holder 35 of the thread brake 23 are attached.
  • the function of the first thread guide 50 can be taken over by a thread guide at the exit of the prewinder 22 and the function of the second thread guide 51 can be taken over by a thread guide of the thread monitor 24.
  • 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 should be relatively small.
  • thread guides 50, 51 in the form of bars or rods
  • thread guides in the form of thread eyes.
  • the thread brake 23 has only been described above for the weft thread 3.
  • the thread brakes 23 for the weft threads 4 and 5 can be designed in the same way.
  • the thread brake shown and described in the exemplary embodiments for braking weft threads 3, 4, 5 of a rapier weaving machine can of course also be used for braking weft threads in other types of weaving machines, for example air jet weaving machines, water jet weaving machines, projectile weaving machines or any other type of weaving machine.
  • the thread brake 23 can also be used to brake a thread in other types of textile machines, for example in winding machines, building machines, knitting machines or other types of machines in which a thread has to be braked.

Landscapes

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

F.adenbremse F. wire brake
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 which can be pressed against a stationary braking element by means of loading means in order 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 Druckluft- mittel 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 known from FR-A 1 161 662, IT 593 034 and FR-A 2 300 734. In these types, the movable brake element is pressed against a stationary brake element by means of its own weight, by means of a force which can be set by magnetic means and / or by means of a force which can be set by compressed air means. Such thread brakes have the disadvantage that they can lead to damage and / or breakage of threads, especially if the threads have nubs or thick spots and / or 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.A thread brake is known from DE 21 30 670, which is provided with two pairs of movable, plate-shaped brake elements. These brake elements are each attached to two pins without jamming, for which purpose they are provided with correspondingly large cutouts. Between the two pairs of brake elements, an electromagnet is arranged, the armature of which is provided with a bridge, each on the outer Brake elements abuts and presses them against the inner brake elements.
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 .A thread tensioner or a thread brake from GB-A 20 93 488 is also known, which has two plate-shaped braking elements, between which the thread to be braked runs. This thread brake contains an electromagnet that forms two poles. A first plate-shaped braking element, which consists of non-magnetizable material, is applied to the two poles. The second, outer brake element consists of magnetizable material and can be used by means of the magnetic force on the brake element consisting of non-magnetizable material. The two plate-shaped brake elements are aligned essentially vertically and attached to two bolts. The path of movement of the thread to be braked runs horizontally essentially in the middle of both braking 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. 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.A thread brake is known from CH-A 68 21 48, by means of which two threads running in parallel can be braked at two successive points. Each braking point has three plate-shaped braking elements, ie a central braking element and two outer braking elements. The threads run on both sides of the central braking element, so that they can be braked between the central and an outer braking element. The three braking elements are held in a hook-shaped guide with an edge running parallel to the path of movement of the thread. One of the two outer brake elements lies against a wall of a bracket. The opposite outer brake element is loaded by means of an adjustable spring force and can be pressed in the direction of the middle and the other outer brake element. The path of movement of the threads lies between the edge of the brake elements guided in the hook guide elements and the point of application for the loading force. The invention has for its object to provide a thread brake of the type mentioned so that the risk of damage and / or breakage of threads is reduced, even if these threads have knobs, thick spots, thin spots or 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 is guided along a path of movement between the braking elements, that the plate-shaped braking element projects transversely to the path of movement of the thread over the stationary braking element and is supported tiltably at a distance from the path of movement of the thread by means of a tilting axis which is essentially parallel is aligned with the path of movement of the thread.
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 brake element can tilt in a simple manner about the predetermined tilting axis if knobs or other irregularities of a thread run in between the brake elements, so that these can run largely without a sudden increase in the braking force or without significant impediment from 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 it is provided that the plate-shaped braking element is held by means of two pins which are arranged substantially perpendicular to the stationary braking element and in the direction of movement of the thread to be braked at a distance from each other, of 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 are arranged on the side of the tilting axis facing away from the path of movement of the thread, and that the plate-shaped braking element is provided with recesses surrounding the pins with play. In this embodiment, the tilt axis of the plate-shaped brake element is determined by the contact points at which the recesses of the plate-shaped brake element touch the pins. This embodiment offers advantages with regard to the tilting of the movable brake element. In this embodiment, the tilt axis fixed, the torque with which the running thread acts on the movable brake element is also absorbed.
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 zusammenfäll .In the first embodiment of the invention it is provided that the tilt axis coincides with an edge of the stationary braking element which runs essentially parallel to the direction of movement of the thread.
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 coincides with an edge of a holding part which surrounds the stationary braking element and runs essentially parallel to the direction of movement of the thread. In both cases, it is ensured that the plate-shaped brake element also bears against a defined tilting axis in the area between the pins.
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 Brems- fläche der Bremselemente konvex gekrümmt ist . Das vereinfacht die Kippbewegung des beweglichen Bremselementes.The edge that defines the tilt axis outside the area of the pins can run in a straight line. In an advantageous embodiment, it is provided that the edge of the stationary brake element or the edge of the web enclosing the stationary brake element is essentially convexly curved to the braking surface of the brake elements. This 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 are aligned essentially vertically and the tilting axis is aligned essentially horizontally. This arrangement is advantageous with regard to the tilting movement of the movable brake element, since its own weight has little influence on the tilting movement and thus a relatively heavy movable brake element can be used. This is particularly advantageous if the loading means contain an electromagnet.
Bevorzugt wird vorgesehen, daß als Belastungsmittel für das aus magnetisierbarem Material bestehende plattenförmige Bremselement eine Feder mit vorzugsweise einstellbarer Bela- stungskraft 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 a spring with preferably adjustable loading is used as the loading means for the plate-shaped braking element consisting of magnetizable material. Stungskraft and a switchable electromagnet serve. In a preferred further development it is provided that the electromagnet has two poles which are arranged on the side of the stationary braking element on both sides of the path of movement of the thread. It is expedient if one of the poles of the electromagnet is arranged approximately in the region of the tilt axis. This has the advantage that the movable brake element can still tip about the tilting axis even when loaded by means of the electromagnet.
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 the stationary brake element and / or the movable brake element are provided with a run-in slope in a run-in area for the thread to be braked. This is advantageous for the thread to pass 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 tilting axis - seen in plan view - is oriented at an angle tapering in the direction of movement of the thread to the path of movement of the thread. A thickening entering the thread brake can then tilt the movable brake element relatively easily.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der in den Zeichnungen dargestellten Ausführungsbeispiele .Further features and advantages of the invention result from the following description of the exemplary embodiments shown in the drawings.
Fig. 1 zeigt in schematischer Darstellung eine Greiferwebmaschine mit mehreren erfindungsgemäßen Fadenbremsen,1 shows a schematic representation of a rapier weaving machine with several thread brakes according to the invention,
Fig. 2 eine perspektivische Ansicht in größerem Maßstab einer erfindungsgemäßen Fadenbremse,2 is a perspective view on a larger scale of a thread brake according to the invention,
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) ,3 is an exploded view of the thread brake of FIG. 2 (without a resilient loading device), 4 is a front view of the thread brake according to the invention according to FIGS. 2 and 3 (without resilient loading device),
Fig. 5 eine Draufsicht auf die Fadenbremse nach Fig. 2 bis 4,5 is a plan view of the thread brake according to FIGS. 2 to 4,
Fig. 6 eine teilweise geschnitte Darstellung der Fadenbremse nach Fig. 2 bis 5,6 shows a partially sectioned illustration of the thread brake according to FIGS. 2 to 5,
Fig. 7 einen Teilschnitt entsprechend Fig. 6 in größerem Maßstab während des Durchlaufens einer Dickstelle,7 is a partial section corresponding to FIG. 6 on a larger scale while passing through a thick spot,
Fig. 8 einen Teilschnitt entsprechend Fig. 7 auf eine abgewandelte Ausführungsform während des Durchlaufens des Fadens durch die Fadenbremse undFig. 8 is a partial section corresponding to Fig. 7 on a modified embodiment while passing the thread through the thread brake and
Fig. 9 eine Draufsicht ähnlich Fig. 5 auf eine abgewandelte Ausführungsform einer Fadenbremse.Fig. 9 is a plan view similar to FIG. 5 of 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 gegenüberliegen- den 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 a donor rapier 1 and a slave rapier 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 raised and lowered by means of shed forming means, not shown. The weft threads are fed to the donor gripper 1 by means of needles 9, 10, 11 of a thread feed device 8, picked up by the donor gripper 1, cut off in the region of a guide 14 in the region of the selvedge 15 in the area of the selvedge 15 by means of a weft scissors 12 and then by means of the donor gripper 1 brought up to about the middle of the shed 6. The slave gripper 2 moves from the opposite side 16 substantially in synchronism with the master gripper 1 into the shed 6 and out of it again. Essentially in the middle of the shed 6, the respective weft thread is removed from the donor gripper 2 from the donor gripper 1 and from the receiver gripper 2 to the opposite side. the page 16 of the shed 6 transported. Thereafter, the weft thread is released on this side by the slave gripper and then hit by the reed 17 on the fabric edge of the fabric 18, after which they are bound in by the warp threads 7. The encoder gripper 1 and the slave gripper 2 are each arranged on driven gripper belts 19, 20, by means of which they are moved into and out of the shed 6.
Die Schußfäden 3, 4, 5 laufen von Spulen 21 über VorabwicklerThe weft threads 3, 4, 5 run from bobbins 21 via pre-unwinder
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 Fadenbremsen22, thread brakes 23, thread monitor 24 and the needles 9, 10, 11 to the entry side 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. It also receives 24 thread break signals from the thread monitors. The thread brakes
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.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 pre-winding devices 22 are also fastened to this frame 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. 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 .In Fig. 1 a shaft 27 is shown, which rotates synchronously with the main drive shaft of the rapier weaving machine. In order to determine the angular position of this shaft 27, an encoder disk 28 is provided on it, which works together with a sensor 29 which is connected to the control unit 25. The sensor 29 inputs signals into the control unit that represent the angular position of the shaft 27. An input device 30 is also connected to the control unit 25, by means of which data for controlling the thread brakes 23 are input, in order also the thread brakes as a function of the angular position of the shaft 27 and thus in synchronism with the operation of the rapier weaving machine and / or as a function of the movement profile to control the weft thread entered in a shed 6. Such a control system is known, for example, from US Pat. No. 5,002,098, so that it is not further explained here. The thread brakes 23 to which the present invention relates are shown in Figs. 2-7. A thread brake 23 contains two brake elements 31, 32, between which a weft thread 3 can be braked. One brake element 31 is arranged stationary, while the other brake element 32 is movable. The brake elements 31, 32 are at least in the area in which they come into contact with the weft thread 3 made of wear-resistant material or with a wear-resistant coating. The thread brake 23 also contains loading means in order to press the brake elements 31, 32 against one another. These loading means consist of an electromagnet 33 and a spring 34, both of which load the movable brake element 32 in the direction of the stationary brake element 31. The braking elements 31, 32 are aligned substantially vertically in the illustrated embodiment.
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 Ankle- bens an die Halterung 35.The stationary brake element 31 is a thin, flexible disk, which is made, for example, of a steel that cannot be magnetized or is only slightly magnetized, and which is firmly attached to a holder 35. The holder is made of non-magnetizable material, for example an aluminum casting. The stationary brake element 31 is provided with openings 36 in the region of its two ends so that it can be fastened to the holder 35 with the aid of screws 37. A clamping element 38 is provided in order to fit the stationary braking element snugly against a counter surface of the holder 35. The tensioning element 38 presses the lamellar brake element 31 into a notch 40 in the holder 35 by means of a rod 39, in particular a rubber rod. Of course, it is also possible to fasten the brake element 31 to the holder 35 in a different manner, for example by means of gluing 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, the thickness of which is of the order of 1 mm or less. The braking element 32 has two cutouts 41, 42 provided, which are arranged at a distance from each other in the direction of movement A of the weft thread 3 to be braked. These openings 41, 42 are also at different distances from the path of movement of the weft thread 3 to be braked. The reason for this will be explained below. The bracket 35 is provided with two pins 43, 44. The pins 43, 44, which consist for example of ceramic, are fixedly attached to the holder 35, for example glued into bores in the holder 35. The pins 43, 44, which are aligned substantially perpendicular to the braking elements 31, 32, are surrounded by the openings 41, 42, which have a rectangular cross section, with a relatively large amount of play. The pins 43, 44 are also arranged at different distances from the path of movement of the weft thread 3 to be braked. As shown in FIG. 4, the recess 41 has an edge 45 which bears against the pin 43 at a contact point 47. The recess 42 also has an edge 46 which bears against the pin 44 at a point of contact 48. The contact points 47, 48 determine a tilt axis 49 about which the plate-shaped brake element 32 can be tilted. As can be seen from FIG. 4, in the preferred embodiment the edges 45, 46 run 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 Be- wegungsbahn des Schußfadens 3 als die Aussparung 42.When a weft thread 3 is braked by means of the thread brake 23, it exerts a torque M on the plate-shaped brake element 32, as shown in FIG. 4. As a result, the plate-shaped brake element 32 is rotated such that the edge 45 of the cutout 41 bears against the point of contact 47 with the pin 43 and the edge 46 of the cutout 42 bears against the point of contact 48 with the pin 44. Because of this torque M, the pin 43 is arranged on the side of the tilt axis 49 facing the movement path of the weft thread 3, while the pin 44 is arranged on the side of the tilt axis 49 facing away from the movement path of the weft thread 3. For this reason, the two recesses 41 and 42 are also arranged accordingly, ie the recess 41 closer to the loading Path 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 tilt axis 49 formed by the points of contact 47, 48 of the plate-shaped brake element 32 with the pins 43, 44 is at a distance from the path of movement of the weft thread to be braked. The tilt axis 49 runs almost parallel to its direction of movement A. In the illustrated embodiment, it can be seen that the tilt axis 49 according to the view in FIG. 4 is essentially parallel to the path of movement of the weft thread 3 and in the top view in FIG. 5 under a relatively small one Angle B runs to the weft 3. This relatively small angle B has the advantage that the weft thread 3 can tilt the plate-shaped brake element 32 about its tilt axis. In the illustrated embodiment, the tilt axis 49 is essentially 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 determined in the illustrated embodiment by two thread guides 50, 51, which are fastened to the holder 35 in a manner not shown, for example with screws. The holder 35 is further provided with an opening 52, by means of which it can be fastened to the frame 26 with, for example, a rod-shaped holder.
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 designed as a truncated cone-shaped coil spring, is supported on the one hand on the plate-shaped brake element 32 and on the other hand on an adjusting nut 53. The adjusting nut 53 is screwed onto a threaded spindle 54, which has an essentially U-shaped shape and is fastened to the holder 35. For example, it can be glued into a bore 55 in the holder 35. By adjusting the adjusting nut 53, the bias of the spring 34 and thus its loading force can be selected. As can be seen in particular from FIGS. 7 and 8, the plate-shaped brake element 32 projects beyond the stationary brake element 31 on the side of FIG Tilt axis 49. The spring 34 is arranged and aligned in such a way that its axis and thus the center of gravity of its loading force is directed to an area which lies between the path of movement of the weft thread 3 and the tilt axis 49.
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 EisenstabesAs can be seen in particular from FIG. 6, the electromagnet 33 contains two bent iron rods 56, 57, the ends of which are located outside the holder 35 by means of an iron rod
58 verbunden sind. Auf diesem Eisenstab 58 ist eine Wicklung58 are connected. There is a winding on this iron rod 58
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.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 path of movement of the weft thread 3 to be braked lies between the two poles 60, 61. As can be seen from FIGS. 3 and 6, the holder 35 is provided with a cavity 62 in which the iron rods 56 and 57 and the poles 60, 61 are located. This cavity 62 is filled with an insulating plastic, so that both the iron rods 56, 57 and the iron rod 58 and the winding 59 are kept free of vibrations. The winding 59 can be supplied with a defined current by the control unit 25 at certain times, so that the required magnetic force is generated in order to pull the plate-shaped braking element 32 towards 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. Any type of coil and / or core can be used as an electromagnet, which generates a magnetic field in the region of poles 60, 61 in order to pull the plate-shaped brake element 32 towards the brake element 31.
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 tangen- tial 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 Brems- element 31 ist ferner so angeordnet, daß sein Rand 63 tangen- tial 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 brake element 31 has an approximately U-shaped shape. Its (in the installed position) upper edge 63 is provided in the region of the pin 43 with a recess 64, so that the edge 63 extends tangentially to the top of the pin 43, ie to the 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 such that its edge 63 extends tangentially to the underside of pin 44, ie to the point of contact 48 between edge 46 of recess 42 of plate-shaped braking element 32. Section 65 of the edge located between pins 43 and 44 63 thus essentially coincides with the tilt axis 49. The section 65 thus supports the plate-shaped brake element 32 when it tilts about its tilt axis 49, as can be seen in particular from FIGS. 6 and 7. As can be seen in particular from FIG. 3, the pole 60 of the electromagnet 33 is arranged in the vicinity of the section 65 and thus in the vicinity of the 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 surface of the plate-shaped brake element 32, which lies opposite the stationary brake element 31, is essentially flat in the section which is attracted by the poles 60, 61 of the electromagnet and on which the spring 34 acts. The infeed area for the weft 3, i.e. the area facing the thread guide 50 of the plate-shaped brake element 32 is curved away from the stationary brake element 31, so that an entry slope for the weft thread 3 is created.
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 Brems- element 32 mit einer relativ großen Kraft von dem Elektromagneten 33 angezogen werden.During weaving, the movable brake element 32 is loaded by the spring 34 toward the stationary brake element 31, so that the weft thread 3 between the brake elements 31 and 32 is braked. The spring 34 is relatively weak, so that the braking force applied by the spring 34 is relatively low. This braking force can be adjusted by turning the adjusting nut 53 on the threaded spindle 54. If a higher braking force is required during a weft insertion, the electromagnet 33 is activated so that the movable brake element 32 is attracted by the poles 60 and 61. The weft thread 3 is then clamped more strongly between the stationary brake element 31 and the movable brake element 32. Since the stationary brake element 31 consists of a material that cannot be magnetized or is hardly magnetizable, the movable brake element 32 are attracted by a relatively large force from the electromagnet 33.
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 Frei- raum 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 Brems- element 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.When the weft thread 3, as shown, for example, in FIG. 6, is between the stationary brake element 31 and the movable brake element 32, the movable brake element 32 assumes a position in which it rests on the section 65 of the edge 63 of the stationary brake element 31 is supported. This tilting is possible because a space 66 is left in the holder 35 above the stationary brake element 31. The plate-shaped brake element 32 is thus slightly tilted about the tilt axis 49 and / or the section 65 of the edge 63 of the stationary brake element 31. If - as shown in FIG. 7 - a thickening 67 of the weft thread 3 runs through the thread brake 23, this thickening 67 tilts the movable brake element 32 further away from the stationary brake element, the movable brake element 32 about the tilt axis 49 tilts, which essentially coincides with the section 65. Tilting of the movable brake element 32 is not hindered by the pins 43, 44, since the cutouts 41, 42 have a relatively large play relative to the pins 43, 44 transverse to the direction of movement A of the thread. Since the weft thread 3 exerts a torque M on the movable brake element 32 for braking between the brake elements 31, 32, the edges 45 and 46 of the recesses 41 and 42 are pressed against the respective pins 43 and 44. The openings 41, 42 can therefore be relatively large compared to the pins 43, 44 without the movable brake element 32 rotating during operation about a horizontal axis. The tilt axis 49 thus remains determined during weaving by the connecting line between the point of contact 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.
Bei dem Ausführungsbeispiel nach Fig. 8 ist die Halterung 35 mit einem Steg 68 versehen, der den oberen Rand des stationä- ren 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 is provided with a web 68 which the upper edge of the stationary ren brake element 31 surrounds. This web 68 runs in the same way as was described in the exemplary embodiment described above with regard to the section 65 of the upper edge 63 of the stationary braking element 31. The web 68 thus forms an upper edge 69 which substantially coincides with the tilt axis 49, so that the movable brake element 32 is supported on this edge 69. The use of a web may have the advantage that the stationary braking element 31 does not necessarily have to be positioned exactly.
Bei dem Ausführungsbeispiel nach Fig. 9 ist die dem stationären Bremselement 31 zugewandte Fläche des beweglichen Brems- elementes 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.In the exemplary embodiment according to FIG. 9, the surface of the movable brake element 32 facing the stationary brake element 31 is curved slightly convexly. At least it is on the inlet side facing the thread guide 50, i.e. where the weft to be braked first comes into contact with the braking element 32 curved away from the stationary braking element 31. The surface of the stationary brake element 31 facing the movable brake element 32 is also slightly convexly curved. The upper edge 70 of the stationary brake element 31 is thus also slightly convex in the area between the pins 43, 44. This is advantageous when the movable brake element 32 is tilted, since the brake element 32 only lies against the edge 70 for a short distance, so that the brake element 32 can be tilted against a relatively low resistance. In this embodiment too, the tilt axis 49 is fixed by the pins 43, 44 in such a way that it runs essentially parallel to the weft thread 3 to be braked. 9, the tilt axis 49 forms a relatively small angle C with the weft thread 3 to be braked, so that overall the tilt axis 49 runs essentially parallel to the weft thread 3 to be braked and the braking element 32 can therefore be tilted in a simple manner .
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 which are on the holder 35 of the thread brake 23 are attached. The function of the first thread guide 50 can be taken over by a thread guide at the exit of the prewinder 22 and the function of the second thread guide 51 can be taken over by a thread guide of the thread monitor 24. 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 should 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, other embodiments of thread guides can also be 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 has only been described above for the weft thread 3. Of course, the thread brakes 23 for the weft threads 4 and 5 can be designed in the same way.
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 thread brake shown and described in the exemplary embodiments for braking weft threads 3, 4, 5 of a rapier weaving machine can of course also be used for braking weft threads in other types of weaving machines, for example air jet weaving machines, water jet weaving machines, projectile weaving machines or any other type of weaving machine. In addition, the thread brake 23 can also be used to brake a thread in other types of textile machines, for example in winding machines, building machines, knitting machines or other types of machines in which a thread has to 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 the exemplary embodiment described and illustrated. The object determined by the claims can also be realized in other forms.

Claims

Patentansprüche claims
1. Fadenbremse (23) mit einem beweglichen, plattenförmigen Bremselement (32), das mittels Belastungsmitteln (33, 34) an ein stationäres Bremselement (31) andrückbar ist, um einen zwischen den Bremselementen (31, 32) laufenden Faden (3, 4, 5) zu bremsen, d a d u r c h g e k e n n z e i c h n e t , d a ß der Faden (3, 4, 5) entlang einer Bewegungsbahn zwischen den Bremselementen (31, 32) geführt ist, daß das plattenförmige Bremselement (32) quer zur Bewegungsbahn des Fadens das stationäre Bremselement (31) überragt und in Abstand der Bewegungsbahn des Fadens kippbar mittels einer Kippachse (49) abgestützt ist, die im wesentlichen parallel zur Bewegungsbahn des Fadens (3, 4, 5) ausgerichtet ist.1. Thread brake (23) with a movable, plate-shaped braking element (32) which can be pressed onto a stationary braking element (31) by means of loading means (33), in order to move a thread (3, 4) running between the braking elements (31, 32) , 5) to brake, characterized in that the thread (3, 4, 5) is guided along a movement path between the braking elements (31, 32), that the plate-shaped braking element (32) transversely to the movement path of the thread, the stationary braking element (31 ) protrudes and is tiltably supported at a distance from the path of movement of the thread by means of a tilt axis (49) which is oriented essentially parallel to the path of movement of the thread (3, 4, 5).
2. Fadenbremse nach Anspruch 1, dadurch gekennzeichnet, daß das plattenförmige Bremselement (32) mittels zwei Stiften (43, 44) gehalten ist, die im wesentlichen lotrecht zu dem stationären Bremselement (31) und in Bewegungsrichtung (A) des zu bremsenden Fadens (3) in Abstand zueinander angeordnet sind, von welchen der in Bewegungsrichtung (A) des Fadens (3) erste Stift (43) auf der der Bewegungsbahn des Fadens (3) zugewandten Seite und der zweite Stift (44) auf der der Bewegungsbahn des Fadens (3) abgewandten Seite der Kippachse (49) angeordnet sind, und daß das plattenförmige Bremselement (32) mit die Stifte (43, 44) mit Spiel umgebenden Aussparungen2. Thread brake according to claim 1, characterized in that the plate-shaped brake element (32) is held by means of two pins (43, 44) which are substantially perpendicular to the stationary brake element (31) and in the direction of movement (A) of the thread to be braked ( 3) are arranged at a distance from one another, of which the first pin (43) in the direction of movement (A) of the thread (3) on the side facing the path of movement of the thread (3) and the second pin (44) on the side of the path of movement of the thread (3) opposite side of the tilt axis (49) are arranged, and that the plate-shaped brake element (32) with the pins (43, 44) with play surrounding recesses
(41, 42) versehen ist.(41, 42) is provided.
3. Fadenbremse nach Anspruch 2, dadurch gekennzeichnet, daß die Aussparungen (41, 42) mit in Richtung der Kippachse (49) verlaufenden geraden Rändern (45, 46) versehen sind.3. Thread brake according to claim 2, characterized in that the recesses (41, 42) with in the direction of the tilt axis (49) extending straight edges (45, 46) are provided.
4. Fadenbremse nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kippachse (49) mit einem im wesentlichen parallel zur Bewegungsrichtung (A) des Fadens (3) ver- laufenden Rand (63, 65) des stationären Bremselementes (31) zusammenfällt .4. Thread brake according to one of claims 1 to 3, characterized in that the tilt axis (49) with a substantially parallel to the direction of movement (A) of the thread (3) ver running edge (63, 65) of the stationary braking element (31) coincides.
5. Fadenbremse nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kippachse (49) mit einem im wesentlichen parallel zur Bewegungsrichtung (A) des Fadens (3) verlaufenden Rand (69) eines das stationäre Bremselement (31) einfassenden Steges (68) einer Halterung (35) zusammenfällt.5. Thread brake according to one of claims 1 to 3, characterized in that the tilt axis (49) with a substantially parallel to the direction of movement (A) of the thread (3) edge (69) of the stationary brake element (31) enclosing web ( 68) a bracket (35) coincides.
6. Fadenbremse nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Rand (63, 65) des stationären Bremselementes (31) oder der Rand (69) des das stationäre Bremselement6. Thread brake according to claim 4 or 5, characterized in that the edge (63, 65) of the stationary braking element (31) or the edge (69) of the stationary braking element
(31) einfassenden Steges (68) geradlinig ausgebildet oder im wesentlichen lotrecht zur Bremsfläche des Bremselementes (31) konvex gekrümmt ist .(31) bordering web (68) is rectilinear or is substantially convexly curved perpendicular to the braking surface of the braking element (31).
7. Fadenbremse nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Bremselemente (31, 32) im wesentlichen vertikal und die Kippachse (49) im wesentlichen horizontal ausgerichtet sind.7. Thread brake according to one of claims 1 to 6, characterized in that the braking elements (31, 32) are aligned substantially vertically and the tilt axis (49) are aligned substantially horizontally.
8. Fadenbremse nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß als Belastungsmittel für das aus magnetisierbarem Material bestehende plattenförmige Bremselement8. Thread brake according to one of claims 1 to 7, characterized in that as a loading means for the plate-shaped braking element consisting of magnetizable material
(32) eine Feder (34) mit vorzugsweise einstellbarer Belastungskraft und ein schaltbarer Elektromagnet (33) dienen.(32) a spring (34) with preferably adjustable loading force and a switchable electromagnet (33) are used.
9. Fadenbremse nach Anspruch 8, dadurch gekennzeichnet, daß der Elektromagnet (33) zwei Pole (60, 61) aufweist, die auf der Seite des stationären Bremselementes (31) beidseits der Bewegungsbahn des Fadens (3) angeordnet sind.9. Thread brake according to claim 8, characterized in that the electromagnet (33) has two poles (60, 61) which are arranged on the side of the stationary braking element (31) on both sides of the path of movement of the thread (3).
10. Fadenbremse nach Anspruch 9, dadurch gekennzeichnet, daß ein Pol (60) des Elektromagneten (33) wenigstens annähernd im Bereich der Kippachse (49) angeordnet ist. 10. Thread brake according to claim 9, characterized in that a pole (60) of the electromagnet (33) is arranged at least approximately in the region of the tilt axis (49).
11. Fadenbremse nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß das stationäre Bremselement (31) und/oder das bewegliche Bremselement (32) in einem Einlaufbereich für den zu bremsenden Faden (3) mit einer Einlaufschrägen versehen sind.11. Thread brake according to one of claims 1 to 10, characterized in that the stationary brake element (31) and / or the movable brake element (32) are provided with an inlet slope in an inlet area for the thread to be braked (3).
12. Fadenbremse nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die Kippachse (49) - in der Draufsicht gesehen - in einem sich in Bewegungsrichtung (A) des Fadens12. Thread brake according to one of claims 1 to 11, characterized in that the tilt axis (49) - seen in plan view - in one in the direction of movement (A) of the thread
(3) verjüngenden Winkel (B, c) zur Bewegungsbahn des Fadens(3) tapering angle (B, c) to the path of movement of the thread
(3) ausgerichtet ist. (3) is aligned.
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 true EP0973686A1 (en) 2000-01-26
EP0973686B1 EP0973686B1 (en) 2002-07-10

Family

ID=3890450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98928191A Expired - Lifetime EP0973686B1 (en) 1997-04-07 1998-04-07 Yarn tensioning device

Country Status (6)

Country Link
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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WO2010049128A1 (en) * 2008-10-31 2010-05-06 Picanol N. V. Thread brake and method of using the thread brake

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US10669653B2 (en) * 2015-06-18 2020-06-02 Kevin Kremeyer Directed energy deposition to facilitate high speed applications
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BE1018327A3 (en) * 2008-10-31 2010-09-07 Picanol Nv WIRE BRAKE AND METHOD OF USING THE WIRE BRAKE.

Also Published As

Publication number Publication date
DE59804724D1 (en) 2002-08-14
BE1011089A3 (en) 1999-04-06
US6161595A (en) 2000-12-19
WO1998045201A1 (en) 1998-10-15
ES2178221T3 (en) 2002-12-16
EP0973686B1 (en) 2002-07-10

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