EP0294323B1 - Elektronisch gesteuerte Fadenbremse und Verwendung der Fadenbremse - Google Patents

Elektronisch gesteuerte Fadenbremse und Verwendung der Fadenbremse Download PDF

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Publication number
EP0294323B1
EP0294323B1 EP88810315A EP88810315A EP0294323B1 EP 0294323 B1 EP0294323 B1 EP 0294323B1 EP 88810315 A EP88810315 A EP 88810315A EP 88810315 A EP88810315 A EP 88810315A EP 0294323 B1 EP0294323 B1 EP 0294323B1
Authority
EP
European Patent Office
Prior art keywords
yarn
brake
thread
lamella
brake according
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
EP88810315A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0294323A1 (de
Inventor
Lorant Gacsay
Beat Meierhofer
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.)
Sulzer AG
Original Assignee
Gebrueder Sulzer AG
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 Gebrueder Sulzer AG filed Critical Gebrueder Sulzer AG
Publication of EP0294323A1 publication Critical patent/EP0294323A1/de
Application granted granted Critical
Publication of EP0294323B1 publication Critical patent/EP0294323B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • 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
    • 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
    • B65H59/24—Surfaces movable automatically to compensate for variation in tension
    • 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 present invention relates to a thread brake with electromagnetically controllable braking power, to the use of such a thread brake and to an arrangement of a plurality of thread brakes.
  • Thread brakes of this type are used, for example, as weft brakes for defenseless weaving machines such as projectile, rapier, water jet and air weaving machines and generally in those cases where a thread is not moved at a constant speed and where the thread continues to run, ie the parts overtake the weft insertion member of the thread should be avoided.
  • rapier weaving machines in which the weft thread is first accelerated by the rapier rapier and then decelerated to the transfer point in the middle in order to be accelerated and decelerated a second time after transfer to the rapier rapier.
  • this requires a weft brake, which releases the weft completely without braking in the acceleration phases in time with these acceleration and deceleration phases, brakes more or less strongly in the deceleration phases and possibly jams, i.e. holds in a clamping manner in other phases of the weaving cycle.
  • Electromagnetically controllable disc brakes are known.
  • the plates and actuating levers for the plates have relatively large masses, which in turn results in high response times for braking power changes, or else requires complex structural measures for the magnet coils. Due to the short switching times and relatively large masses, high forces and high wear and tear occur, for example, when the movable plate strikes when opening, when the thread brake is released.
  • German patent DE 34.46.567 describes a weft brake, in which the thread is braked between two leaf spring-like plates and the braking power is controllably increased with additional electromagnets.
  • the basic setting of the leaf spring brake is adjustable and predefined by the preload of the leaf springs.
  • the thread is braked by a relatively short part, at the end of the leaf springs facing away from the holder.
  • the electromagnets that boost the braking power are also arranged in this area, so that the braking power is always provided by this short, almost punctiform end area. With such an arrangement, the thread is loaded almost selectively, which leads to high surface pressures on the thread. If the weft thread is very uneven and there are thread defects, the momentary loading of the thread in the braking area can vary in such a way that the thread tears or, conversely, is braked insufficiently, which is annoying and undesirable in any case.
  • the present invention brings significant progress here and does not have the disadvantages of known thread brakes.
  • the invention is contained in the characterizing part of claim 1. Furthermore, the invention relates to the use of such a thread brake as a weft brake in defenseless weaving machines.
  • the dependent claims relate to advantageous developments of the invention.
  • the thread brake has short response times and remains controllable even at very high thread speeds, which can be in the range of 50 m / s and higher, for example, in the case of unprotected high-performance weaving machines. Due to the transfer of the braking power to the thread over a longer thread length of, for example, a few cm, the specific surface pressure on the thread is significantly lower with the same braking power, and the thread is thus braked more gently than with known thread brakes. In particular, the high specific surface load of the thread that is disruptive in previous thread brakes is eliminated during the braking process. The lower specific stress on the braking elements also leads to an improved service life of the thread brake. In addition, the braking performance of this new thread brake is significantly less affected by the unevenness of the thread.
  • the side of the flexible, lamellar brake film facing away from the thread could also be provided with a very light, practically mass-free plastic layer, for example a foam, which can make handling the film easier and reduce the risk of cut injuries for the operating personnel.
  • a very light, practically mass-free plastic layer for example a foam, which can make handling the film easier and reduce the risk of cut injuries for the operating personnel.
  • thread brakes can be combined to form a multi-shot thread brake, for example with a common control.
  • the thread brake 1 of FIG. 1 is arranged in the schematic example shown as a weft brake between the weft thread store and a main nozzle 31 of a weaving machine 3 in the running direction of the weft thread 21. It is of no importance for the explanations below, according to which unprotected weft insertion method the weft thread 21 is inserted into the symbolically drawn shed 32.
  • the three controllable electromagnets 112, 113, 114 are installed in the rigid strip 11, the surface 111 of which faces the thread 21 and is provided with an abrasion-resistant surface covering which forms the actual braking surface.
  • the electromagnets can be cast in the housing 110, which is, for example, a profile made of plastic, a non-ferromagnetic metal, ceramic, glass or another non-ferromagnetic material.
  • the magnets 112, 113, 114 are pot or holding magnets with a low-iron core, which have a short switching time of, for example, five milliseconds or shorter.
  • a lamellar, Ferromagnetic metal foil 115 forms the second braking element and is pulled by the magnets 112, 113, 114 when the current is switched on against the brake lining of the rigid magnetic strip.
  • the ferromagnetic metal foil 115 has the function of an armature for the magnets 112, 113, 114.
  • the weft thread experiences a braking force that can be changed and controlled with the magnetic force of the controllable electromagnets.
  • the film 115 is fastened to the axis 116, which are fastened in bores of the two webs 117.
  • the film 115 is slightly pretensioned, but due to the very small bending moment of the film, this does practically nothing to contribute to the braking performance. This only ensures that the film 115 bears against the thread and counteracts a possible fluttering of the film 115. It is essential that the film 115, which has a very low mass and is therefore almost weightless, rests over most of its length on the rigid braking surface 111 of the strip 11, or on the thread 21, at most with its own weight.
  • the braking power is practically exclusively provided by the electromagnets 112, 113, 114 when the film 115 is more or less attracted by them.
  • the metal foil 115 When braking, the metal foil 115 is deformed transversely to the thread running direction and wraps around the thread in a larger angular range, as is shown and described with reference to FIG. 4. With the thread brake released, however, i.e. When the electromagnets 112, 113, 114 are switched off, the practically weightless metal foil 115 is in contact with the thread 21 only along a line, so that the thread 21 is practically not braked.
  • the control electronics 4 for the thread brake 1 and the main nozzle 31 change those on the weft thread 21 Braking force exerted, for example, as a function of the position of the tip of the weft thread 21 in the shed 32 and the angle of rotation of the weaving machine (FIGS. 1, 1a). With weaving machines, the sequences of many functions are defined based on the angle of rotation of the main drive shaft.
  • the control electronics 4 continuously uses the sensor 41, for example, to determine this angle of rotation.
  • the sensor 42 determines the point in time at which the tip of the weft thread 21 passes through at a specific position in the shed 32 and can, for example, also emit a thread running signal of the weft thread to the control electronics.
  • the three sensors 43 monitor the weft thread in the final phase of the weft insertion, it being possible for the thread directly or the weft insertion member to deliver the signals for the control electronics. From these signals from the sensors 41, 42 and 43, the control electronics 4 are able to determine the braking power currently required and to change the power of the brake magnets 112, 113, 114 via the inputs 44 and to adapt them to the respective requirements. It is possible to control each of the magnets 112, 113, 114 separately or to connect them in series and to control them in the same direction. It would also be possible to group magnets in groups, the magnets of which are connected in series, for control purposes.
  • the two magnets for example 112 and 114, could be connected in series and the third magnet 113 could be connected in parallel.
  • the control electronics also takes over the control of the valve 45 of the main nozzle 31.
  • the control 4 for the thread brake 1 can be an independent unit or a part, for example, of a central control electronics and can be fully integrated therein.
  • the three can be seen in the partially sectioned, schematic side view of the thread brake 1 from FIG. 2 Pot magnets 112, 113, 114, which are combined in the housing 110 to form a strip 11.
  • the surface 111 of the strip 11 facing the thread 21 forms the actual thread brake with the lamellar, ferromagnetic metal foil 115.
  • This metal foil forms the anchor of the pot magnets 112, 113, 114.
  • the ferromagnetic metal foil can, for example, be a steel lamella of a few hundredths of a millimeter thickness. Films made of non-crystalline metal, known as glass metals, which combine the properties of high wear resistance and good magnetic properties, have also proven particularly useful. A layer of non-ferromagnetic glass metal with high wear resistance would also be suitable as a surface covering on the surface 111 facing the thread 21, ie the braking surface of the strip 11.
  • a thread brake with a single elongated, strip-shaped magnet would also be conceivable, which magnetically influences the metal foil over a substantial part of its length.
  • Fig. 3 which shows a schematic section according to III-III of Fig. 2, the practically weightless metal foil 115 lies on the thread 21 and the thread experiences practically no braking effect.
  • the brake magnets 112, 113, 114 are switched on, the lamellar foil 115 deforms as shown in FIG. 4 in such a way that the wrap angle of the metal foil around the thread 21 increases and / or the thread 21 is flattened such that the contact surface between thread 21 and the surface 111 of the strip 11 facing the thread 21 and the metal foil are enlarged.
  • the thread 21 is braked very gently by the large braking surface.
  • the time variation of the braking power which is caused, for example, by irregularities in the thread diameter, is less than, for example, in the case of disc brakes or leaf spring brakes, in which the total braking power is provided on a shorter thread length and, in addition, the braking members have a larger mass and thus a greater inertia.
  • Fig. 5 shows a thread brake according to the invention, in which in the bar 11 'in addition to four magnet coils B1, B2, B3 and B4, which are the brake magnets, the three air coils L1, L2 and L3 are also present.
  • the brake magnets B1, B2, B3, B4 are switched off, it is possible to lift the metal foil completely, ie to release the thread brake, with correctly polarized air coils, ie if the same poles of permanent magnets and air coils are opposite each other. By reversing the polarity of the air coils, they could also provide braking performance.
  • the permanent magnets P1, P2, P3 increase the rigidity of the metal foil 115 'in their area, the flexibility of the foil between the permanent magnets and thus the thread-saving braking properties, but are largely retained.
  • the metal foil 115 '' in the thread running direction on both sides at the edge of spacers 118, which between the metal foil 115 '' and the braking surface 111 '' of the bar 11 '' a gap for the Release the unbraked thread.
  • the brake magnets are switched on, which, for example, are located between the spacer elements when viewed in the direction of travel of the thread, the yarn is braked in the manner described. If spacer elements 118 are also present in the area of the brake magnets, the metal foil is deformed and the metal foil is adapted to the thread 21, transversely to the thread running direction, for example in the manner shown in dashed lines in FIG. 6.
  • the metal foil 715 is fastened to the cover-like carrier 71 with the L-shaped fastening brackets 72, 73.
  • the carrier 71 with the metal foil 715 in turn is attached to the bar 711, with the braking surface 711 'with the two pivot tabs 74 and 75 and screws.
  • the distance between the metal foil 715 and the braking surface 711 ' can be adjusted with the adjusting screw 7111 by changing the angular position of the swivel tabs 74 and 75.
  • the swivel tabs 74 are held in the selected position by the spring 76, one end of which is fastened to the swivel tab 74 and the other to the bar 711.
  • the recess 70 in the carrier 71 permits the passage of thick spots in the thread 221 without the thread tension being increased too much, by dodging the metal foil 715 in the caressed position 715 'in the recess 70.
  • the metal foil 715 can nestle under the action of the magnetic forces similar to the thread 721 as shown in FIG. 6.
  • Fig. 9 shows L-shaped mounting bracket 73, with the two holding pins 77, 77 'which engage in holes 7150 and 7150' of the metal foil 715.
  • the metal foil 715 can be fastened in the holder 72 in the same way. With this type of installation, the metal foil 715 need not be clamped between the fastening bracket 73 and the carrier 71.
  • the holes in which the holding mandrels can engage are oversized, so that the metal foil lies loosely and freely movable only with part of its own weight and only temporarily on the thread.
  • the metal foil could also be clamped between the carrier and the holder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Sewing Machines And Sewing (AREA)
EP88810315A 1987-05-27 1988-05-13 Elektronisch gesteuerte Fadenbremse und Verwendung der Fadenbremse Expired - Lifetime EP0294323B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH205787 1987-05-27
CH2057/87 1987-05-27

Publications (2)

Publication Number Publication Date
EP0294323A1 EP0294323A1 (de) 1988-12-07
EP0294323B1 true EP0294323B1 (de) 1991-07-10

Family

ID=4224910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810315A Expired - Lifetime EP0294323B1 (de) 1987-05-27 1988-05-13 Elektronisch gesteuerte Fadenbremse und Verwendung der Fadenbremse

Country Status (6)

Country Link
US (1) US4875506A (ru)
EP (1) EP0294323B1 (ru)
JP (1) JPS63309651A (ru)
BR (1) BR8802571A (ru)
DE (1) DE3863588D1 (ru)
RU (1) RU1838475C (ru)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1002841A3 (nl) * 1989-02-16 1991-06-25 Picanol N V Naamloze Vennoosch Inrichting voor het remmen van een inslagdraad in een weefmachine.
FR2648120B1 (fr) * 1989-06-09 1991-12-13 Steib Bertrand Dispositif de freinage a pre-reglage et commande automatique pour un fil en deplacement
DE59105505D1 (de) * 1990-09-10 1995-06-22 Rueti Ag Maschf Fadenbremse für Webmaschinen.
CH682926A5 (de) * 1991-02-06 1993-12-15 Sulzer Ag Fadenbremse mit elektromagnetisch betätigter Bremslamelle.
DE4131656A1 (de) * 1991-09-23 1993-03-25 Iro Ab Verfahren und webmaschine
FR2695414B1 (fr) * 1992-09-04 1995-09-08 Saurer Diederichs Sa Dispositif de freins de trame commandes pour machine a tisser a plusieurs trames.
JP2955145B2 (ja) * 1992-09-08 1999-10-04 東レ株式会社 扁平糸織物とその製造方法および製造装置
IT1260645B (it) * 1993-04-08 1996-04-22 Lgl Electronics Spa Dispositivo di frenatura modulata del filato per apparecchi alimentatori di trama
DE4324160A1 (de) * 1993-07-19 1995-01-26 Iro Ab Eintragsystem für eine Düsenwebmaschine
IT1272696B (it) * 1993-09-29 1997-06-26 Nuovopignone Ind Meccaniche Ef Frenafilo di trama perfezionato per telaio tessile senza navetta
CN1035337C (zh) * 1994-09-29 1997-07-02 尤沃彼基奥尼工业机械股份公司 无梭织机的新型纬纱制动器
BE1010389A3 (nl) * 1996-06-26 1998-07-07 Picanol Nv Draadrem voor het remmen van een inslagdraad bij een weefmachine.
DE19919122A1 (de) * 1999-04-27 2000-11-02 Iro Patent Ag Baar Aktuator und Fadenbremse mit einem Aktuator
DE60017667T2 (de) * 1999-10-26 2005-07-07 L.G.L. Electronics S.P.A., Gandino Schussfadenbremse, insbesondere für Webmaschinen
SE520305C2 (sv) * 1999-12-08 2003-06-24 Texo Ab Bromsanordning för ett antal frammatningsbara trådar eller garn i eller till textilmaskin
DE10150504A1 (de) * 2001-10-12 2003-04-17 Iropa Ag Fadenbremse
US7543610B2 (en) * 2006-06-16 2009-06-09 Sultex Ag Thread clamp for a rapier head
DE102004043867A1 (de) 2004-09-10 2006-03-16 Iro Ab Fadenbremsvorrichtung
EP1811068B1 (de) * 2006-01-24 2009-06-17 Sultex AG Gesteuerte Fadenbremse
US8960596B2 (en) 2007-08-20 2015-02-24 Kevin Kremeyer Energy-deposition systems, equipment and method for modifying and controlling shock waves and supersonic flow
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
US10669653B2 (en) * 2015-06-18 2020-06-02 Kevin Kremeyer Directed energy deposition to facilitate high speed applications

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH480255A (de) * 1968-10-23 1969-10-31 Sulzer Ag Fadenbremse
JPS5063261A (ru) * 1973-10-09 1975-05-29
CH584650A5 (ru) * 1974-09-06 1977-02-15 Peyer Siegfried
FR2300734A1 (fr) * 1975-02-13 1976-09-10 Gabet Denimal Dispositif de frein
SU598981A1 (ru) * 1977-01-10 1978-03-25 Казахский государственный университет им.Кирова Электрический тормоз уточной нити к ткацкому станку
US4112561A (en) * 1977-02-24 1978-09-12 Champion International Corporation Apparatus for manufacturing filaments of varying denier and actuating means therefor
SU1097727A1 (ru) * 1982-11-22 1984-06-15 Ленинаканский Филиал Ереванского Политехнического Института Им.К.Маркса Устройство дл нат жени нити
FR2568595B1 (fr) * 1984-08-02 1986-09-05 Alsacienne Constr Mat Tex Dispositif de commande positive pour frein de fil.
DE3446567C1 (de) * 1984-12-20 1986-05-07 Lindauer Dornier Gmbh, 8990 Lindau Schussfadenbremse mit stufenweise steuerbarer Bremswirkung
CH670116A5 (ru) * 1986-04-28 1989-05-12 Univ Kazakhsky

Also Published As

Publication number Publication date
DE3863588D1 (de) 1991-08-14
EP0294323A1 (de) 1988-12-07
JPS63309651A (ja) 1988-12-16
BR8802571A (pt) 1988-12-20
US4875506A (en) 1989-10-24
RU1838475C (ru) 1993-08-30

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