EP1852531B1 - Mécanisme de formation de la foule, métier à tisser équipé d'un tel mécanisme et procédé de sélection des crochets mobiles d'un tel mécanisme - Google Patents

Mécanisme de formation de la foule, métier à tisser équipé d'un tel mécanisme et procédé de sélection des crochets mobiles d'un tel mécanisme Download PDF

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Publication number
EP1852531B1
EP1852531B1 EP07356059A EP07356059A EP1852531B1 EP 1852531 B1 EP1852531 B1 EP 1852531B1 EP 07356059 A EP07356059 A EP 07356059A EP 07356059 A EP07356059 A EP 07356059A EP 1852531 B1 EP1852531 B1 EP 1852531B1
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EP
European Patent Office
Prior art keywords
hook
angle
slope
hooks
movement
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Active
Application number
EP07356059A
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German (de)
English (en)
French (fr)
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EP1852531A1 (fr
Inventor
Damien Bouchet
Alexis Porte
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.)
Staeubli Lyon SA
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Staeubli Lyon SA
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Publication of EP1852531A1 publication Critical patent/EP1852531A1/fr
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/24—Features common to jacquards of different types
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C3/00—Jacquards
    • D03C3/12—Multiple-shed jacquards, i.e. jacquards which move warp threads to several different heights, e.g. for weaving pile fabrics

Definitions

  • the invention relates to a shedding mechanism and to a loom equipped with such a mechanism.
  • the invention also relates to a method for selecting the movable hooks of such a mechanism.
  • a shedding mechanism selectively raises heddles, each comprising an eyelet through which a warp thread passes, which yarn is located, depending on the position of a hook to which the yarn is attached. upper end of the bar, above or below a weft yarn moved by the loom.
  • Such a known mechanism for example of EP-A-1,413,657 comprises movable hooks each provided with a lateral nose capable of cooperating with knives animated vertical reciprocating movements in opposition of phase.
  • Each mobile hook is equipped with a flexible metal blade for interacting with a retaining lever belonging to the selection device, which gives overall satisfaction.
  • an elastic stop is disposed on the path of the movable hooks when they reach the vicinity of the top dead center of their trajectory.
  • this movable stop overcomes the frictional forces exerted on the movable hook when it begins its downward movement, which avoids having to oversize the return springs of the movable hooks.
  • Such an elastic stop has the effect of suddenly overloading the shedding mechanism when the movable hooks are moved upwards, near the top dead center of their respective trajectories. Indeed, these movable hooks all meet substantially simultaneously the corresponding stops which are loaded by a prestressed compression spring.
  • this elastic stop has a cost, which decreases the overall economic performance of a mechanism incorporating such a stop.
  • the invention intends to remedy more particularly by proposing a new mechanism for forming the shed in which the direction of movement of the movable hooks can easily be reversed in the vicinity of the top dead center of their respective trajectory, without excessive overloading of the drive means of the knives and with a reasonable cost.
  • the invention relates to a mechanism for forming the shed on a Jacquard weaving loom, this mechanism comprising movable hooks each displaced by a knife, between a top dead center position, in or near which each hook can be immobilized by a selection device, and a bottom dead center position, each movable hook comprising a body, provided with a spout intended to bear against the corresponding knife, and a flexible blade, fixed on this body with possibility of relative movement and intended to interact with a retaining lever belonging to the selection device, while the selection lever forms a sliding ramp of a portion of the elastic blade when the hook is moved in the vicinity of its position of top dead center.
  • This mechanism is characterized in that the sliding ramp of the selection lever is shaped so that the component parallel to the direction of movement of the hook of the resultant of the forces applying to the flexible blade when it is in contact with the ramp, near the top dead center of its trajectory and at the beginning of its descent movement, is directed downwards.
  • the bottom of the mechanism corresponds to the side of this mechanism facing the crowd when the mechanism is installed above the loom, in normal configuration of operation.
  • the top of the mechanism is defined as the opposite of the bottom of this mechanism.
  • an upper portion of the mechanism is disposed above a lower portion of the mechanism, i.e. the opposite of the lower portion with respect to the shed of the loom in a normal configuration. installation of the mechanism.
  • the sliding ramp of the selection lever makes it possible to exert on the flexible blade a downward force which compensates for the friction forces experienced by the flexible blade, which makes it possible to dispense with an elastic stop of the type of EP-0 823 501 .
  • the invention also relates to a loom equipped with a mechanism for forming the crowd as previously described, such a loom is more economical and can operate at higher speeds than the known trades.
  • the invention relates to a method of selecting mobile hooks in a shedding mechanism as described above.
  • This method is characterized in that it consists in exerting, by means of the selection lever and on the elastic blade of each hook when it is at the beginning of its downward movement, in the vicinity of the top dead center of its trajectory, a individual effort whose component parallel to the direction of movement of the hook is directed downwards and whose intensity is greater than the intensity of the friction forces then experienced by the blade.
  • a warp of warp 1 comes from a beam 2.
  • Each warp 1 passes through the eyelet 3a of a stringer 3 intended to open the step to allow the passage of a pick to constitute the fabric which wound on a reel 4.
  • Only two smooth 3 and 3 'are represented at the figure 1 the arm 3 being in the high position, while the arm 3 'is in the low position.
  • the lower end of each rail is connected to the frame of the loom by a tension spring 5, while its upper end is secured to an arch 6.
  • a shedding mechanism 7 associated with an electronic control unit 8 makes it possible to lift the arches 6 more or less against a return force exerted by the springs 5.
  • each arch has an end 6a integral with a housing 10 of the mechanism 7, this arch passing in a mitt 11 suspended from a cord 12 whose two ends are respectively integral with two movable hooks 13 to be selectively raised by knives 14 animated by a movement of vertical oscillations in phase opposition, as shown by the arrows F 2 .
  • each hook 13 is formed of a plastic body 20 in the lower end 201 of which is overmolded an end 12a of the cord 12.
  • the body 20 forms a single spout 202 which extends laterally with respect to a principal longitudinal axis XX 'of the body 20.
  • This spout 202 is intended to bear on the upper surface 14a of a knife 14.
  • the hook 13 can thus be regularly lifted by a single knife 14.
  • each hook 13 When resting on the knife 14 adjacent, each hook 13 is moved along its axis X-X '.
  • the hook 13 also comprises a flexible metal blade 21 partially overmolded in the body 20.
  • the blade 21 comprises a portion 211 overmolded in a zone 203 of the body 20, located near its lower end 201, that is, that is, below the portion 204 of the body 20 from which the mouth 202 extends laterally.
  • the portion 211 is open downwards, which allows the passage of the end 12a of the cord 12 which can be overmolded in the body 20 to a length L 12 .
  • the blade 21 extends over a length L 21 above its portion 211, this length being relatively large compared to the total length L '21 of the blade 21
  • the blade 21 comprises two lateral uprights 212 and 212 'defining between them a window 213 in which is housed most of the body 20.
  • the amounts 212 and 212' are connected by a cross member 215 which separates the window 213 from a opening 216 arranged between the parts 212, 212 ', 214 and 215 of the blade 21.
  • the elements 20 and 21 are integral at the bottom of the hook 13, while the portion of the blade 21 which extends along the length L 21 above the zone 203 of the body 20 , is capable of lateral deflections, as represented by the double arrow F 3 at the figure 4 .
  • These lateral deflections F 3 correspond, in fact, to a relative movement of the blade 21 relative to the body 20.
  • the mechanism 7 also comprises an electromagnet 15 overmolded in a part of the housing 10.
  • the housing 10 comprises two fixed axes 10a on which are pivotally mounted two retaining levers 16 intended to cooperate respectively with the two movable hooks 13 connected to the two ends of the same cord 12.
  • Each lever 16 comprises a metal armature 30 provided with a circular section circular bore 301 adapted to the outside diameter of an axis 10a, so that the armature 30 can be mounted about an axis 10a with the possibility of pivoting, as represented by the double arrows F 4 at the figure 2 .
  • the bore 301 of each armature 30 is formed in an end 302 of this armature.
  • the frame 30 is overmolded in a body 31 made of a non-magnetic material, such as a plastic material.
  • the body 31 forms a spout 311 retaining a movable hook 13 near its top dead center position.
  • the body 31 is also provided with a centering heel 312 with respect to a spring 32 exerting on the body 31 a force F 5 tending to pivot the lever 16 towards the outside of the housing 10. This effort tends to penetrate the beak 311 in the opening 216 of the blade 21 of a neighboring mobile hook, which allows to retain such a movable hook in the upper position.
  • the metal armature 30 of a lever 16 makes it possible to control its pivoting thanks to the electromagnet 15, a lever 16 that can be moved by the bent end 214 of a blade 21, and possibly held in position at against the force F 5 , when the electromagnet 15 is excited.
  • each groove 10b of the housing 10 is delimited by two ribs 10f and 10f 'between which it extends, which allows effective guidance of the upright 212 or 212' which it receives parallel to the axes XX 'and X 10 -X' 10 .
  • Each rib has this shape from the bottom of the housing 10 to approximately the location of the upper curved portion of the nozzle 202 on the right of the figure 2 where the rib 10f 'is removed, while the rib 10f is extended upwards.
  • the removal of the outer edge 10f 'of the groove that is to say the fact that it is open towards the outside of the housing near the retaining lever 16, allows the outward movement of the blade 21 , in the direction of the arrow F 7 to 1a Figure 2B , when the blade 21 bears against the lever 16 next to, as shown on the left of the figure 2 to exert a leveling effort F 6 .
  • the outer rib 10f ' which forms the outer edge of the groove 10b may not be removed on the height H but deviate from the rib 10f to leave the blade 21 a gap of sufficient clearance.
  • the bent end 214 of the blade 21 is also dimensioned so that it can bear and exert a force F 6 against a ramp 313 formed by the edge of the body 31 of each lever 16 opposite the X axis 10 -X '10 .
  • This momentary support of a hook 13 on a lever 16 makes it possible to level the lever 16, that is to say its bearing on the electromagnet 15, with elastic preload due to the bending of the blade 21 which provides the function of the elastic tongue described in EP-A-0 219 437 .
  • the blade 21 thus provides a leveling function.
  • the flexible blade 21 is in contact with the housing 10 at the two grooves 10b in which are engaged its amounts 212 and 212 '. It is also in contact with the ramp 313 of the corresponding lever 16 on which slides its end 214.
  • a first contact zone A is located in the lower part of the blade 21, in which part the blade 21 slides in the groove 10b. In this zone, the blade 21 undergoes a reaction force R A whose component N normal to the axis XX 'is directed outwards, that is to say away from the axis X 10 -X '10 .
  • the blade bears against this rib, which generates a reaction of the same type as the reaction R B.
  • the point of contact B is then where the rib 10f 'deviates from the rib 10f.
  • reaction force seen by the blade 21 can be defined as a reaction R C equal to the sum of the effects of the elastic deformation of the blade 21 and the friction of the end 214 on the body 31.
  • D 313 is a straight line defining the mean direction of the ramp 313 in the plane of the figure 3 .
  • ⁇ the angle between the line D 313 and the axis XX '.
  • the sum of the components F A , F B and F C is directed downwards.
  • the intensity of the force F C is greater than the sum of the intensities of the friction forces F A and F B.
  • a value of the angle ⁇ between 8 and 15 °, or even between 8 and 12 °, makes it possible to achieve quite satisfactory results insofar as the hook 13 is not braked too suddenly when it reaches the top dead center of its trajectory by being raised by a knife 14, while it is effectively sent down when the knife 14 initiates its downward movement, the blade 21 also initiating its downhill movement.
  • the ramp 313 is generally rectilinear and extends in the direction of the line D 313 .
  • the ramp 313 may be provided with corrugations formed by a succession of bumps 313a and recesses 313b which make it possible to reduce the friction force F 313 by decreasing the coefficient of friction between the ramp 313 and the end 214 of the blade 21. Indeed, these corrugations can hold on the ramp 313 a lubricant such as grease or equivalent.
  • the portion of the spout 311 against which the end 214 of the blade 21 slides may also be provided with such undulations.
  • the corrugations have an amplitude corresponding to the distance between the ridge of the bumps 313a and the bottom of the recessed portions 313b, much smaller than the dimensions of the body 31.
  • This amplitude may be of the order of 0.2 mm.
  • the ramp 313 could however be curved.
  • the tangents to the ramp 313 are such that they each form an angle of between 5 and 15 °, preferably between 8 and 12 °, relative to the axis X-X '.
  • the ramp 313 can be broken down into two parts, respectively a lower portion 313A and an upper portion 313B, the portion 313A being closer to the hook 311 than the portion 313B.
  • D 313A and D 313B denote the lines defining the average directions of the portions 313A and 313B at the figure 8 .
  • the line D 313A forms an angle ⁇ A with the axis XX ', whereas the line D 313B forms an angle ⁇ B , greater than the angle ⁇ A , with respect to this same axis.
  • the angle ⁇ A can have a value between 5 and 12 °, while the angle of ⁇ B has a value between 7 and 15 °.
  • the configuration of the figure 8 has the advantage of generating a force F C directed down relatively low intensity when the blade approaches the ramp 313 by its portion 313A, when the hook 13 is raised by the knife 14 corresponding.
  • the docking between the blade 21 and the hook 16 is thus progressive and not brutal.
  • the orientation of the portion 313B of the ramp 313 makes it possible effectively to exert a return force sufficient to overcome the friction forces, of the type of the components F A and F B , when the hook initiates its downward movement bearing on the knife 14 if it is not retained in the high position by the spout 311 of the lever 16.
  • the ramp 313 is shaped so that the component F C of the force it exerts on the blade 21 when the blade initiates its downward movement is sufficient to overcome the frictional forces F A and F B.
  • the resultant components parallel to the axis XX 'of the forces experienced by the blade 21 is then directed downwards, which makes it possible to dispense with an elastic stop of the type of that described in FIG. EP-A-0 823 501 .
  • the blade 21 and the selection lever 16 exert an individual force F C whose component parallel to the axis XX 'is greater than the intensity of the friction forces F A and F B.
  • the invention relates to two-position shedding mechanisms used for weaving so-called "flat" fabrics, unlike the three-position mechanisms used for carpets and velvets.
  • the invention can be used in the context of combining two-position mechanisms making it possible to obtain a three or four-position crowd, as described, for example, in EP-B-0 399 930 or FR-B-2,715,666 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Woven Fabrics (AREA)
EP07356059A 2006-05-03 2007-05-02 Mécanisme de formation de la foule, métier à tisser équipé d'un tel mécanisme et procédé de sélection des crochets mobiles d'un tel mécanisme Active EP1852531B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0603942A FR2900666B1 (fr) 2006-05-03 2006-05-03 Mecanisme de formation de la foule, metier a tisser equipe d'un tel mecanisme et procede de selection des crochets mobiles d'un tel mecanisme

Publications (2)

Publication Number Publication Date
EP1852531A1 EP1852531A1 (fr) 2007-11-07
EP1852531B1 true EP1852531B1 (fr) 2009-07-01

Family

ID=36997829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07356059A Active EP1852531B1 (fr) 2006-05-03 2007-05-02 Mécanisme de formation de la foule, métier à tisser équipé d'un tel mécanisme et procédé de sélection des crochets mobiles d'un tel mécanisme

Country Status (8)

Country Link
US (1) US7490633B2 (zh)
EP (1) EP1852531B1 (zh)
JP (1) JP2007297767A (zh)
CN (1) CN101067255B (zh)
AT (1) ATE435320T1 (zh)
DE (1) DE602007001409D1 (zh)
FR (1) FR2900666B1 (zh)
TW (1) TWI399467B (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1019154A5 (nl) * 2010-01-15 2012-04-03 Wiele Michel Van De Nv Selectie-inrichting voor de gaapvormingsinrichting van een weefmachine.
CN102206887B (zh) * 2011-05-20 2013-03-27 浙江奇汇电子提花机有限公司 一种经线开口选择机构的助吸方法和装置
FR3037601B1 (fr) * 2015-06-22 2018-06-22 Staubli Lyon Lame d'entrainement de crochets appartenant a une mecanique jacquard et mecanique jacquard comprenant une telle lame
FR3118070B1 (fr) 2020-12-21 2022-12-23 Staubli Lyon Mecanisme de formation de la foule et metier a tisser de type jacquard
FR3118069B1 (fr) 2020-12-21 2024-01-12 Staubli Lyon Mecanisme de formation de la foule et metier a tisser de type jacquard

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7108172U (de) * 1971-03-04 1971-05-27 Mayer K Gmbh Vorrichtung an einer jacquardeinrichtung
US3967652A (en) * 1973-07-06 1976-07-06 Staubli Ltd. Spring hook for the harness pull of a double-lift open-shed jacquard machine
FR2587045B1 (fr) * 1985-09-06 1987-10-23 Staubli Verdol Dispositif pour la formation de la foule d'un metier a tisser comportant un crochet de retenue basculant
GB8827141D0 (en) * 1988-11-21 1988-12-29 Bonas Machine Co Heald control device
FR2647473B1 (fr) * 1989-05-24 1991-07-26 Staubli Verdol Perfectionnements aux mecaniques d'armure a trois positions
FR2656009B1 (fr) * 1989-12-15 1992-03-06 Staubli Verdol Dispositif de formation de la foule permettant d'assurer une ouverture importante de son pas.
FR2685014B1 (fr) * 1991-12-11 1994-04-01 Staubli Ets Mecanisme jacquard pour la realisation de motifs sur les lisieres des tissus en cours de tissage.
FR2703697B1 (fr) * 1993-04-07 1995-06-23 Staubli Sa Ets Mécanique jacquard à courses différenciées.
FR2715666B1 (fr) * 1994-01-28 1996-05-03 Staubli Verdol Mécanique d'armure propre à engendrer quatre positions des fils de chaîne d'un métier à tisser.
FR2726011B1 (fr) * 1994-10-25 1996-12-20 Staubli Sa Ets Nouvel harnais demontable pour mecaniques jacquard
FR2742170B1 (fr) * 1995-12-12 1998-01-23 Staubli Verdol Perfectionnements aux mecaniques d'armures a double leve
GB9609425D0 (en) * 1996-05-04 1996-07-10 Bonas Machine Co Heald control mechanism
FR2752246B1 (fr) * 1996-08-06 1998-10-09 Staubli Lyon Procede et dispositif de selection des crochets mobiles d'un mecanisme de formation de la foule et metier a tisser du type jacquard
FR2756574B1 (fr) * 1996-11-29 1999-01-08 Staubli Lyon Dispositif de selection, mecanique d'armure a trois positions et metier a tisser equipe d'une telle mecanique d'armure
FR2767843B1 (fr) * 1997-09-01 1999-10-22 Staubli Lyon Dispositif de selection, mecanique d'armure a trois positions et metier a tisser equipe d'une telle mecanique d'armure
FR2800395B1 (fr) * 1999-10-28 2002-03-15 Staubli Lyon Dispositif et ensemble de solidarisation de ressort de harnais jacquard et metier a tisser equipe d'un tel ensemble
FR2846343B1 (fr) * 2002-10-25 2004-12-17 Staubli Lyon Mecanisme de formation de la foule et metier a tisser equipe d'un tel mecanisme

Also Published As

Publication number Publication date
TWI399467B (zh) 2013-06-21
ATE435320T1 (de) 2009-07-15
DE602007001409D1 (de) 2009-08-13
TW200745397A (en) 2007-12-16
JP2007297767A (ja) 2007-11-15
CN101067255B (zh) 2011-08-31
US20070267083A1 (en) 2007-11-22
US7490633B2 (en) 2009-02-17
EP1852531A1 (fr) 2007-11-07
FR2900666A1 (fr) 2007-11-09
FR2900666B1 (fr) 2008-06-20
CN101067255A (zh) 2007-11-07

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