EP0659919B1 - Frein de fil de trame pour un métier à tisser - Google Patents

Frein de fil de trame pour un métier à tisser Download PDF

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Publication number
EP0659919B1
EP0659919B1 EP94118839A EP94118839A EP0659919B1 EP 0659919 B1 EP0659919 B1 EP 0659919B1 EP 94118839 A EP94118839 A EP 94118839A EP 94118839 A EP94118839 A EP 94118839A EP 0659919 B1 EP0659919 B1 EP 0659919B1
Authority
EP
European Patent Office
Prior art keywords
thread
weft
drive
drive shaft
brake
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
EP94118839A
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German (de)
English (en)
Other versions
EP0659919A1 (fr
Inventor
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 EP0659919A1 publication Critical patent/EP0659919A1/fr
Application granted granted Critical
Publication of EP0659919B1 publication Critical patent/EP0659919B1/fr
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
    • B65H59/26—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path
    • B65H59/28—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path the surfaces being urged towards each other
    • B65H59/30—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
    • 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 weft brake for a weaving machine, which can be attached between a thread store and an insertion means and which contains at least one thread guide element which is adjustable by means of a drive means and deflects a weft thread.
  • Thread brakes are used in particular in air jet looms to brake a weft thread towards the end of its entry. They are usually placed between a pre-unwinder and a main blow nozzle attached to a comb drawer.
  • a weft brake EP-A 0 527 510
  • stationary and movable thread guide elements are provided.
  • the movable thread guide elements are arranged on a holder which can be moved by means of a controllable, electrical drive means.
  • a drive motor for example, serves as the drive means and is controlled by a control unit at a specific point in time during the insertion of a weft thread.
  • the braking force that occurs is determined by the deflection angle that is achieved by the guide elements.
  • a thread brake is also known (EP-A 0 356 380), in which thread deflection is effected by means of several thread guide elements for braking, this deflection being partially reversed again after the occurrence of tension peaks.
  • the invention has for its object to provide a weft brake of the type mentioned in such a way that short-term voltage peaks are avoided as far as possible.
  • This object is achieved in that between the drive means and the at least one thread guide element there is provided a transmission means which transmits the movement of the drive means and which enables a relative movement between the drive means and the thread guide element.
  • the weft brake according to the invention has the advantage that a rapid movement of the drive means does not immediately lead to a rapid movement of the thread guiding elements, so that the weft thread is braked without brief peaks in tension.
  • the movement of the thread guide elements is essentially dependent on the tension of the weft thread, which moreover leads to the fact that the deflection and thus the braking is less when the tension in the weft thread is high. As a result, the increase in tension of the weft thread due to braking is limited.
  • the thread brake according to the invention has the advantage that even if the tension of the weft thread is reduced, it is still kept taut.
  • controllable drive means in connection with the transfer means permitting relative movement not only allows the tension to be brought to a certain value during the insertion of the weft thread and hold.
  • the air jet weaving machine (1) shown in FIG. 1 contains a thread brake (2) which is arranged between a thread store (3) for the weft thread (30) and an entry means (4) for this weft thread.
  • the thread store (3) consists of a prewinder which has a winding arm (5) which is driven by a drive motor (6) and which winds the weft thread (30) in windings (17) on a winding drum (7).
  • the pre-winding device contains a magnetically actuatable pin (9) which can be advanced to the winding drum (7), in order to prevent or release the winding (17) from the winding drum.
  • the winding drum (7) is also assigned a winding detector (10) which detects the number of windings (17) drawn from the winding drum (7).
  • a stationary thread eyelet (8) is arranged after the thread store (3) for guiding the weft thread (30).
  • a main blowing nozzle (4) which is arranged on a comb (11) of the air jet weaving machine (1) and therefore carries out the movement of the comb (11), serves as the entry means.
  • a bobbin (14) for a bobbin (15) with a weft thread is arranged in front of the thread store (3) and runs through a thread eyelet (16) to the winding arm (5).
  • Fig. 1 further shows a control unit (18), the function of which, insofar as it is important for the present invention, will be explained below.
  • the thread brake (2) is arranged after the thread eyelet (8) in the illustrated embodiment. It is fastened, for example, to a frame (48) of the thread store (3). After the thread brake (2), this frame (48) also has a second thread eyelet (19).
  • the thread brake (2) has two pin-shaped thread guide elements (20, 21) by means of which the weft thread (30) can be deflected between the stationary thread eyelets (8, 19). Scissors (31) for the weft thread (30) are arranged on the weaving machine frame between the main blowing nozzle (4) and the reed (12).
  • thread eyelets (8, 19) can also be part of the thread brake (2). It should also be mentioned that, for example, an auxiliary main blowing nozzle can be arranged on the frame (48) after the thread eyelet (19).
  • FIGS. 2 and 3 A first embodiment of a thread brake (2) according to the invention is shown in FIGS. 2 and 3. For the sake of clarity, the components are shown in an exploded view far apart in FIG. 2.
  • the thread brake (2) has two pin-like thread guide elements (20, 21) which are arranged diametrically opposite one another on a disc-shaped, rotatably mounted holder (22).
  • the position of the thread guide elements (20, 21) is specified by means of a drive which can be controlled by the control unit (18).
  • the drive consists of a drive motor (23), on the drive shaft (25) of which the holder (22) is mounted by means of a roller bearing (26).
  • a transmission means which transmits the movement of the drive shaft in the form of a spiral wound Spring (24) provided.
  • the outer end (27) of the coil spring, which is angled, is inserted into a bore (29) in the holder (22).
  • the inner end (28) of the spiral spring (24), as shown in FIG. 3, is held in a bore (32) in the drive shaft (25).
  • FIGS. 4 to 6 A weft insertion and the function of the thread brake (2) controlled by the control unit (18) will now be explained with reference to FIGS. 4 to 6.
  • the comb drawer (11) with the main blowing nozzle (4) is in the position shown in FIG. 4, in which the weft thread (30) runs straight through the thread eyelets (8, 19) and the main blowing nozzle (4).
  • This is an advantageous position for starting a weft insertion in an air jet loom, because in this case the friction of the weft thread (30) on the thread eyelets (8, 19) and on the main blowing nozzle (4) is minimal.
  • the winding detector (10) detects each winding (17) drawn from the winding drum (7) and sends a corresponding signal to the control unit (18). If the length of a weft thread (30) to be entered corresponds to, for example, five windings, the control unit (18) can function the thread brake after detecting the third drawn winding (2) start. 5, the control unit triggers via the drive motor (23) and a rotation of the drive shaft (25) in the direction of the arrow (R1), so that it assumes the position shown by the line (40) in FIG. 5 . The drive shaft (25) is rotated by an angle specified by the control unit (18).
  • the thread guide elements (20, 21) at least initially do not perform the same rotation angle movement, but rather remain due to the forces exerted on them by the weft thread (30). There is a balance between the torque that the spring (24) exerts on the holder and the torque that the weft thread (30) exerts on the holder (22) via the thread guide elements (20, 21).
  • the comb drawer (11) then moves forward together with the main blowing nozzle (4) in the direction of the arrow (P3) until the stop position (4B) is reached. Then the comb drawer (11) with the main blowing nozzle (4) moves back into the position shown in FIG. 6. In this position, the weft is usually cut with the scissors (31). Since the distance between the thread eyelet (19) and the main blowing nozzle (4) decreases when the main blowing nozzle (4) moves back from the stop position to the position shown in FIG. 6, the tension in the weft thread (30) becomes less or is even completely canceled. This can make it difficult to cut the weft thread (30). In the thread brake (2) according to the invention, however, this risk is reduced or eliminated, since the thread guide elements (20, 21) are moved further by means of the spring (24) and follow the drive shaft, so that the weft thread (30) is kept under tension.
  • control unit (18) causes the drive shaft (25) to continue in the direction of the arrow before cutting (R2) rotated until the drive shaft (25) is in the position shown in Fig. 7 (see line (40)).
  • the main blowing nozzle (4) remains with compressed air ( with a lower pressure and / or a lower air flow). Since the distance between the guide eyelet (19) and the main blowing nozzle (4) shortens, the weft thread (30) protrudes from the main blowing nozzle (4) with a greater length in the position according to FIG. 4 than in the position according to FIG. 6.
  • this additional length of weft thread (30) can be a hindrance for the insertion of a weft thread from another main blowing nozzle.
  • the drive shaft (25) can be rotated further by means of the control device (18) (arrow (R2) of FIG. 7) in order to pull the weft thread (30) back into the main blowing nozzle (4).
  • the drive motor (23) can rotate the drive shaft (25) with a certain course from a certain point in time of the entry, for example when the main blowing nozzle is in the position shown in FIG. 5, so that the weft thread (30) increases with increasing strength is braked.
  • the angular position of the drive shaft (25) can also be controlled as a function of the point in time at which the winding detector (10) detects windings (17). If, for example, the third winding is detected earlier than at the expected time, the thread brake (2) can be switched on earlier and also with a larger angular rotation of the drive shaft (25).
  • control unit also controls the prewinder.
  • the drive motor (6) of the pre-winding device is controlled by the control unit (18) at an average speed such that the winding arm (5) makes an average rotation when the winding detector (10) pulls out a winding (17). detected.
  • the pin (9) is then brought back to the winding drum (7), for example, in order to prevent more weft thread (30) from being pulled off the winding drum (7) than is required.
  • FIG. 8 corresponds in principle to the embodiment according to FIG. 2.
  • a disk-shaped holder (33) is arranged in a rotationally fixed manner on the drive shaft (25) and is provided with an opening (34) into which the inner end (28 ) of the spiral wound spring (24) is inserted.
  • FIG. 9 essentially corresponds to the embodiment according to FIG. 2.
  • a second, cup-shaped holder (35) is rotatably mounted on the drive shaft.
  • This holder is provided with a collar (36) which receives the holder (22) so that the area of the spring (24) is shielded from dust.
  • the outer end (27) of the spring (24) is connected to the frame (22) and the inner end (28) to the drive shaft (25) according to FIG. 2.
  • the thread guide elements (20, 21) are rotatable on the drive shaft (25) of the drive motor (23) mounted holder (22) extended towards the drive motor (23) and connected to the drive shaft (25) by means of a leaf spring (37).
  • the leaf spring (37) is fixed in a groove (32) to the drive shaft (25) and engages in grooves (38) of the stanchion elements (20, 21). The leaf spring (37) can thus move in the grooves (38) so that a relative movement between the thread guide elements (20, 21) and the drive shaft (25) is possible.
  • the thread guide elements (20, 21) are connected directly to the drive shaft (25) by means of elastic means, in particular a leaf spring (39).
  • a holder (22) can thus be omitted. Due to an elastic deformation of the leaf spring (39), the thread guide elements (20, 21) can perform a relative movement in the form of a twist to the drive shaft (25).
  • a linearly movable thread guide element (41) is provided, which is immersed between two thread eyelets (8, 19) and thus deflects the weft thread (30).
  • An electromagnet (42) serves as the drive means, to which a drive element (43) designed as a plunger anchor is assigned, which can be moved in the direction of arrow (B) by switching on the electromagnet (42), ie in the direction of a thread deflection.
  • a return spring (44) which resets the drive element (43) against the direction of the arrow (B), engages on a support (45) which is fixedly connected to the drive element (43).
  • Elastic transmission means (46) are provided between the drive element (43) and the thread guide element (41), which allow a relative movement between the thread guide element (41) and the drive element (43) against the direction of the arrow (B).
  • the elastic means can be, for example, a spring (46), which is arranged in a recess of the drive element (43), in which a kind of piston rod (47) of the thread guide element (41) is performed.
  • rubber-elastic bodies or an air cushion or the like are used as elastic means instead of the spring (46). intended.
  • magnetic transmission means (49) are provided between the drive shaft (25) of the drive motor (23) and the thread guide elements (20, 21).
  • These magnetic transmission means (49) consist of two permanent magnet sets, which face each other with opposite poles.
  • a set of permanent magnets (50, 51) is arranged on a holder (33) which is non-rotatably connected to the drive shaft (25).
  • the second set of permanent magnets (52, 53) is attached to the disk-shaped holder (22) which carries the guide elements (21, 22) and which is mounted on the drive shaft (25) by means of a roller bearing (26).
  • the permanent magnets (50, 53) are assigned with their north pole to the south poles of the permanent magnets (51, 52).
  • the holders (22, 23) lie opposite each other at a short distance, so that the permanent magnets (50, 52) and the permanent magnets (51, 53) attract each other. Without external stress, the permanent magnets (50, 52) and (51, 53) ensure that they are exactly opposite each other.
  • the magnetic transmission means (49) allow the holder (22) with the thread guide elements (20, 21) to rotate relative to the drive shaft (25) due to external forces.
  • the magnetic transmission means perform the same function as described in connection with the elastic transmission means (24, 37, 39, 46) using the exemplary embodiments according to FIGS. 1 to 13.
  • the magnetic transmission means (49) themselves do not contain any moving parts that have inertial forces, so that fast reaction times are possible.
  • the permanent magnets (50, 51 and 52, 53) are mutually magnetically isolated. Of course it is without further possible to provide more than two permanent magnet sets (50, 52; 51, 53).
  • the thread brake (2) makes it possible to limit the tensions in the weft thread (30) and therefore to reduce the number of weft thread breaks.
  • a voltage peak at the start of a weft insertion is limited by the alignment of the thread brake (2) and the thread eyelets (8, 9) to the main blowing nozzle.
  • Tension peaks during sudden start-up of the thread brake (2) are limited by the elements (24, 37, 39, 46, 49) that allow a relative movement between the drive means and the thread guide elements.
  • the tension peak at the end of a weft insertion namely when the weft thread (30) is blocked by the pin (9) returning to the winding drum (7), is reduced in that the thread brake (2) has already partially braked the weft thread (30) beforehand.
  • thread guide elements (20, 21).
  • four thread guide elements can be provided, which are each arranged in pairs symmetrically to the drive shaft (25) and at different distances from this drive shaft (25).
  • it is also possible to switch between such To provide sets of thread guide elements additional, stationary thread eyelets.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (7)

  1. Frein (2) de fil de trame pour un métier à tisser, pouvant être disposé entre une réserve de fil (3) et un moyen d'insertion (4), et qui comprend au moins un élément de guidage de fil (20, 21, 41) réglable par un moyen d'entraînement (23, 25 ; 42, 43) pour dévier un fil de trame (30), caractérisé en ce que, entre le moyen d'entraînement (23, 25; 42, 43) et au moins un élément de guidage de fil (20, 21; 41) est prévu un moyen de transfert (24, 37, 39, 46, 49) transférant le mouvement d'entraînement, de sorte qu'un mouvement relatif entre le moyen d'entraînement et l'élément de guidage de fil soit possible.
  2. Frein de fil de trame selon la revendication 1, caractérisé en ce qu'il est prévu, comme moyen d'entraînement, un entraînement rotatif (23) avec un arbre d'entraînement (25) relié par les moyens de transfert (24, 37, 39, 49) à au moins un élément de guidage de fil (20, 21) disposé mobile et coaxial à l'arbre d'entraînement (25).
  3. Frein de fil de trame selon l'une des revendications 1 ou 2, caractérisé en ce qu'il est prévu, pour au moins un élément de guidage de fil (20, 21), un support (22) tourillonné sur l'arbre d'entraînement (25) et lié à celui-ci par les moyens de transfert (24, 37, 49) ce qui produit un mouvement circulaire relatif entre l'arbre d'entraînement et le support.
  4. Frein de fil de trame selon l'une des revendications 1 à 3, caractérisé en ce qu'il est prévu entre le moyen d'entraînement (23, 25; 42, 43) et au moins un élément de guidage de fil (20, 21; 41) un moyen de transfert élastique (24, 37, 39, 46).
  5. Frein de fil de trame selon la revendication 4, caractérisé en ce qu'un ressort en spirale (24) est disposé entre l'arbre d'entraînement (25) et au moins un élément de guidage de fil (20, 21).
  6. Frein de fil de trame selon l'une des revendications 1 à 3, caractérisé en ce que des moyens magnétiques de transfert (49) sont disposés entre le moyen d'entraînement (23, 25) et au moins un élément de guidage de fil (20, 21).
  7. Frein de fil de trame selon la revendication 6, caractérisé en ce que sont prévus un support (33) solidaire en rotation de l'arbre d'entraînement (25) et au moins un élément de guidage de fil (20, 21) porteur et un support (22) tournant sur l'arbre d'entraînement (25) sur lequel sont prévus des aimants permanents (50, 51, 52, 53) reposant l'un contre l'autre.
EP94118839A 1993-12-22 1994-11-30 Frein de fil de trame pour un métier à tisser Expired - Lifetime EP0659919B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9301434A BE1007898A3 (nl) 1993-12-22 1993-12-22 Inrichting voor weefmachines.
BE9301434 1993-12-22

Publications (2)

Publication Number Publication Date
EP0659919A1 EP0659919A1 (fr) 1995-06-28
EP0659919B1 true EP0659919B1 (fr) 1997-03-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94118839A Expired - Lifetime EP0659919B1 (fr) 1993-12-22 1994-11-30 Frein de fil de trame pour un métier à tisser

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US (1) US5544680A (fr)
EP (1) EP0659919B1 (fr)
BE (1) BE1007898A3 (fr)
DE (1) DE59402220D1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1284778B1 (it) * 1996-09-03 1998-05-21 Lgl Electronics Spa Freno di trama perfezionato, particolarmente per telai ad aria
IT1310749B1 (it) * 1999-11-30 2002-02-22 Lgl Electronics Spa Metodo e dispositivo di controllo di freni di trama elettrocomandatiper la regolazione automatica della tensione meccanica del filo di
SE521331C2 (sv) * 1999-12-07 2003-10-21 Texo Ab Anordning vid fournissör
EP1258550B1 (fr) * 2001-05-11 2006-07-12 Kabushiki Kaisha Toyota Jidoshokki Dispositif de contrôle de l'insertion de trame dans un métier à jet
BE1014441A3 (nl) * 2001-10-29 2003-10-07 Picanol Nv Werkwijze en inrichting voor het toevoeren van inslaggaren bij een weefmachine, alsmede rem- en/of dempingsmechanisme hierbij toegepast.
US7543610B2 (en) * 2006-06-16 2009-06-09 Sultex Ag Thread clamp for a rapier head
US6846880B2 (en) * 2002-10-11 2005-01-25 3M Innovative Properties Company Fluoropolymer compositions
DE10361244A1 (de) * 2003-12-22 2005-07-21 Picanol N.V. Vorrichtung zum Aufnehmen eines Abschnittes eines Schussfadens
DE102005011841A1 (de) * 2005-03-15 2006-09-21 Iro Ab Fadenverarbeitungssystem und gesteuerte Fadenbremse
EP2031106B1 (fr) * 2007-08-31 2010-02-24 L.G.L. Electronics S.p.A. Procédé de controle de tension d'un fil délivré par un fournisseur négatif vers une machine textile, et dispositif permettant de mettre en oeuvre le procédé
CN111020851B (zh) * 2019-12-25 2021-02-09 浙江帅龙针织有限公司 一种大圆机的纱线张紧装置

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Publication number Priority date Publication date Assignee Title
FR2535745A1 (fr) * 1982-11-08 1984-05-11 Saurer Diederichs Sa Pince-trame pour machine a tisser sans navette a insertion de trame pneumatique
DE3775180D1 (de) * 1986-10-20 1992-01-23 Sulzer Ag Fadenspannvorrichtung fuer textilmaschine.
IT1203377B (it) * 1987-03-19 1989-02-15 Savio Spa Dispositivo e procedimento per accumulare e restituire filo ad intermittenza nell'avvolgimento di rocche coniche alimentate con filo a velocita' costante
EP0356380B1 (fr) * 1988-08-25 1994-11-23 Sulzer RàœTi Ag Procédé pour éviter les pics de contrainte dans la trame lors de son introduction au moment du freinage
IT1228042B (it) * 1988-12-16 1991-05-27 Santoni & C S P A B Dispositivo tensionatore ad azione regolabile per fili alimentati a macchine tessili, in particolare macchine per maglieria
SU1664914A1 (ru) * 1989-02-28 1991-07-23 Ивановский текстильный институт им.М.В.Фрунзе Механизм компенсации уточной нити ткацкого станка
DE4008058A1 (de) * 1990-03-14 1991-09-19 Stoll & Co H Einfaedel- und fadenwechselvorrichtung fuer fadenfuehrer
EP0475892B1 (fr) * 1990-09-10 1995-05-17 Sulzer RàœTi Ag Frein de fil pour métiers à tisser
DE9113430U1 (de) * 1991-07-22 1992-12-24 Sobrevin Société de brevets industriels-Etablissement, Vaduz Vorrichtung zur unterschiedlichen Bremsung laufender Fäden, Drähte o.dgl.
BE1005173A3 (nl) * 1991-08-13 1993-05-11 Picanol Nv Draadrem.
DE4131652A1 (de) * 1991-09-23 1993-04-01 Iro Ab Webmaschine und eintragbremse fuer webmaschinen
DE4131656A1 (de) * 1991-09-23 1993-03-25 Iro Ab Verfahren und webmaschine

Also Published As

Publication number Publication date
US5544680A (en) 1996-08-13
EP0659919A1 (fr) 1995-06-28
DE59402220D1 (de) 1997-04-30
BE1007898A3 (nl) 1995-11-14

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